CN102479979A - Power battery pack management method and system - Google Patents

Abstract

The invention relates to the field of power battery pack management, and discloses a power battery pack management method and system. The method comprises the following steps: synchronously measuring and acquiring the voltage of each single battery by each single controller, and sending each voltage to an upper controller; the upper layer controller synchronously measures the bus current; the upper layer controller estimates the current charge state of each single battery; the upper layer controller sends a charge balance instruction to each single body controller according to the current charge state of each single battery; and each unit controller balances the charge quantity of the single battery connected with the unit controller according to the received charge balance instruction. The balance and safety management precision of the power battery pack is higher than that of a competitive technology by applying the scheme.

Description

Power battery group management method and system

Technical field

The present invention relates to the power battery group management field, relate in particular to a kind of power battery group management system.

Background technology

Outstanding along with the global resources shortage problem, electrokinetic cell consists of the present major project in the world, and through the technical development of more than ten years, present power battery group management system is mainly following several kinds of forms:

1, centralized management framework.Specifically be for all cells, draw the spreading p-wire respectively to concentrated collector, concentrate collector to gather the voltage of each monomer in order one by one through each long p-wire from electric connector between each cell and battery pack two ends; And, in battery case, place 1 to several temperature sensors, this temperature sensor is connected with Centralized Controller; This temperature sensor detects the temperature variations in space in the battery case; And this temperature variations is passed to Centralized Controller, and Centralized Controller detects bus current on the main power source bus; And the integration of time is carried out battery charge state (State of Charge according to bus current; Be called for short SOC, be used to reflect the dump energy of battery) estimation, and at the current SOC estimated value of display end demonstration.When Centralized Controller according to current SOC estimated value; Judge when current battery management system need carry out equilibrium treatment; Then Centralized Controller carries out equilibrium control, specifically: realize the charged equilibrium between the different monomers through conductive discharge, electric capacity or inductive energy storage and branch mode.

Therefore owing to adopt the centralized management framework, all basically computings, control task are handled by same control manager, are the centralized management framework so this management framework is commonly called as.Though this framework principle is simple, realization easily, the defective below existing:

(1) because by same controller management, in the process of monomer battery voltage test, can not there be very high common-mode voltage in all cells between the cell with avoiding, has a strong impact on the fail safe of actual test accuracy and test circuit.

(2) because the mode that controller is tested according to sequential the voltage tester of each cell in order so this management framework can not accurately record the relative mistake of each cell, can't effectively be removed interference; In addition, the internal resistance of cell is the important indicator of cell health status, and uses the internal resistance that above-mentioned management framework can't obtain each cell, can't effectively manage battery.

(3) thus owing to need to adopt long lead to connect the voltage that each cell is tested each cell, inevitable bus current pulsation is to the interference of the voltage measurement of each cell.Especially; When current pulsating current is relevant with current voltage polling cycle; Under this pulsating current disturbs; System can't eliminate disturb through software filtering, and the management framework mistake is thought real voltage with the voltage of the cell of testing under the current strong jamming situation, and current cell electric weight situation is made erroneous judgement; Can not effectively realize the charged equilibrium of cell: often to not needing balanced cell to carry out equilibrium, and the balanced cell of actual needs fails to obtain equilibrium on the contrary; Perhaps, cell that should charge balancing is on the contrary by equalization discharge or the like.

(4) in addition because the p-wire in this management framework is various, and in the process of using, if wherein one to receive the mouse damaged by insect bad, possibly cause whole management framework comparatively serious balanced management mistake to occur, other battery cell of possible loss.

(5) in order to reduce the error that common-mode voltage brings to test; Improve testing precision, people have on control circuit board, connect high withstand voltage low speed switch element transfer monomer and test circuit, yet should exist cost high by the withstand voltage low speed switch element of height; Weight and size is big; The inherent defect that switching speed is slow, control is complicated, especially, the introducing of the low speed switch element that this height is withstand voltage also can be introduced very high switch noise to system; Even make system under breadboard static environment; Use that this system all is difficult to stablized, reliable monomer voltage data, let alone in being full of the actual environment of electromagnetic interference operate as normal, so there is this system of any automobile employing at present basically.

2, module management framework.In this management framework, the cell of some is connected as a group of battery modules, many group of battery modules are together in series reaches the voltage of power battery pack system requirements then.For each battery module, each the cell two ends from this battery module are drawn the spreading lead-in wire and are electrically connected on corresponding module controller, are concentrated the voltage of each cell in this battery module of test by this module controller.And; Each module controller is electrically connected on the serial communication bus that is electrically connected with the upper strata controller; This upper strata controller also is electrically connected with the main power source bus; Detect bus current, and the integration of time is carried out the battery charge state estimation, and show current SOC estimation at display end according to bus current.When needs carried out the charged equilibrium of system, upper strata controller or module controller control control corresponding module were carried out electric voltage equalization by this control module to each battery cell in the battery module under this control module.Adopt this battery management pattern; Owing to set up control module; Every control module is responsible for the control of a Battery pack monomer in the battery system; In reality, can the quantity of the cell of connecting under this control module be controlled at certain limit, thereby make the common-mode voltage in the module be no more than the withstand voltage of common process integrated circuit, make things convenient for the realization of test circuit.

Though a series of problems that this module management pattern can avoid too high common-mode voltage to bring, the defective below also existing:

The interior test to each cell of each control module remains through the two ends of every cell and pulls out a long line realization test; The path of respectively pulling out line is different; Backguy is different with the area that the main current path in the module is surrounded, and the electromagnetic interference that the strong dynamic load electric current of vehicle electric motor or inverter produces is also just inequality to the interference that system produced.In addition; As consider the error that each internal resistance of single cell brings under electric current changes, adding each battery cell series connection back itself still has the interference of tens of volts common-mode voltage, so this system of application; Still can't accurately obtain the voltage parameter of monomer; Cause balanced erroneous judgement, and still can't realize the charged equilibrium between the module, use it and the unbalanced charging between the module, the situation of discharge still can occur; Still there are (2), (3), (4) described defective in the centralized management framework, cause the actual spendable capacity decline of user, fail safe to descend.

3, monomer is managed framework independently.In the available dynamic batteries management system, also exist independently a kind ofly, in other words conj.or perhaps, the monomer that centralized, modular mixes is managed framework independently.This pattern is mainly actual at present is the protection IC that the digital battery of a monomer is set on each cell; Each protects IC that every cell is detected; When the voltage of cell is higher than the upper limit or is lower than down in limited time; Protection IC sends warning signal to system, and when cell is in normal operation interval, these protection IC and system are the information interactions that have no.

This monomer is managed pattern independently and had following shortcoming: independent protective IC in fact only can accomplish the measuring ability of battery piezoelectric voltage at present, and when the charging overvoltage, it is balanced to start the consuming type low discharging current; In normal the use; It is not participation system management work fully, has only when sending the super-limit prewarning signal, and system can only stop charging, discharge; Almost have not a particle of leeway, so this monomer independent regulatory agency is not suitable for being applied to the power battery group management of means of transportation in reality.

If the early warning signal that utilizes this monomer to manage framework independently carries out battery balanced management, can only charge when accomplishing at part of module or monomer, could begin very faint power consumption equalization operation, and can't equilibrium under discharge condition.

To sum up; Available dynamic battery set management framework all can not accurately be measured each cell in strongly disturbing actual environment voltage, internal resistance change; Can't accurately implement charged balanced management operation, can not reach and take precautions against fault and the damage that cell causes early.

Summary of the invention

Inventing first purpose is: the power battery group management method, its balanced management precision to power battery pack is higher.

Inventing second purpose is: the power battery group management system, its balanced management precision to power battery pack is higher.

A kind of power battery group management method that inventive embodiments provides comprises:

Each monomer controller synchro measure obtains the voltage of each cell, and the voltage of said each cell is sent to the upper strata controller;

When upper strata controller and said monomer controller are measured the voltage of cell, synchronously measure the bus current that obtains power battery pack, wherein said power battery pack is composed in series by said each cell;

Said upper strata controller is estimated the state-of-charge of current said each cell according to the voltage and the bus current of said each cell;

Said upper strata controller sends charged balanced instruction according to the state-of-charge of current said power battery pack and the voltage of said each cell to said each monomer controller;

Said each monomer controller is according to the charged balanced instruction that receives, the quantity of electric charge of the cell that balanced this monomer controller connects.

Preferably, in said step: the upper strata controller also comprised before said each monomer controller sends charged balanced instruction:

Said each monomer controller is measured the temperature of each cell, and said temperature value is sent to the upper strata controller;

Said upper strata controller specifically is according to the voltage of said each cell and bus current, temperature value, estimates the state-of-charge of current said each cell.

Preferably, said each monomer controller is separately positioned on the electrode extraction pole of said each cell.

Preferably, the electrode extraction pole temperature of said each cell of said each monomer controling appliance bulk measurement is as the temperature of said each cell;

When the temperature of arbitrary cell surpassed predetermined temperature range, said upper strata controller started outside humidity control system, and the temperature of said each cell is all remained in the said predetermined temperature range.

Preferably, in step: the controller measurement of said upper strata also comprises after obtaining the bus current of power battery pack:

Said upper strata controller is according to the voltage of said bus current and said each cell; Confirm the bus current variable quantity of a determining time and the voltage variety of said each cell respectively; According to the voltage variety of said bus current variable quantity and said each cell, calculate the internal resistance of confirming said each cell;

When the internal resistance of arbitrary cell is higher than in the predetermined internal resistance in limited time, said upper strata controller sends alarm signal to customer controller.

Preferably, in step: each monomer controller synchro measure also comprises after obtaining the voltage of each cell:

When the voltage of said arbitrary cell surpasses predetermined upper voltage limit, or when being lower than predetermined lower voltage limit,

Perhaps, when the electrode extraction pole temperature of said arbitrary cell is higher than the estimating temperature upper limit, or be lower than under the predetermined temperature in limited time;

Said monomer controller sends alarm signal to said upper strata controller and said customer controller.

A kind of power battery management system that the embodiment of the invention provides comprises: a upper strata controller and at least two monomer controllers, said each monomer controller are connected with said upper strata controller hardware circuit respectively;

Wherein, said upper strata controller comprises:

The upper strata synchronization module is used to provide synchronizing signal;

The bus current measurement module is electrically connected with said upper strata synchronization module, is used under the driving of said synchronizing signal, measures the bus current that obtains power battery pack, and wherein said power battery pack is composed in series by said each cell;

Upper strata state-of-charge estimation block is electrically connected with said bus current measurement module, is used for voltage and bus current according to said each cell, estimates the state-of-charge of current said each cell;

The charged balance module in upper strata is electrically connected with said upper strata state-of-charge estimation block, is used for according to the state-of-charge of current said each cell and the voltage of said each cell, sends charged balanced instruction to said each monomer controller;

Said each monomer controller comprises respectively:

The monomer voltage test module is connected with said upper strata synchronization module, is used under the driving of said synchronizing signal, measures the voltage obtain the cell that is connected with this monomer controller, and the voltage of said each cell is sent to said upper strata controller;

The charged balance module of monomer is used for instructing the quantity of electric charge of the balanced cell that is connected with this monomer controller according to the charged equilibrium that said upper strata controller issues.

Preferably, said each monomer controller is separately positioned on the electrode extraction pole of said each cell.

Preferably, said each monomer controller also comprises respectively:

The monomer temperature detecting module is used to survey the electrode extraction pole temperature with the cell at this monomer controller place, and the temperature of said electrode extraction pole is sent to said upper strata controller;

Said upper strata controller also comprises:

The upper strata temperature control modules is used for when arbitrary electrode extraction pole temperature surpasses predetermined scope, starting outside humidity control system, and the temperature of said each cell is all remained in the said predetermined temperature range.

Preferably, said upper strata controller also comprises:

Monomer internal resistance computing module; Be electrically connected with said bus current measurement module; Be used for voltage according to said bus current and said each cell; Confirm the rate of change of said bus current and the rate of change of said each monomer battery voltage respectively,, calculate the internal resistance of confirming said each cell according to the rate of change of said each monomer battery voltage, the rate of change of bus current;

The internal resistance alarm module is used for internal resistance when arbitrary cell and is higher than in the predetermined internal resistance in limited time, and institute sends alarm signal to customer controller.

Preferably, said each monomer controller also directly is connected with said customer controller hardware circuit;

Said each monomer controller also comprises:

The free state determination module; Be electrically connected with said monomer voltage measurement module, temperature detecting module respectively; Be used to judge whether the voltage of this cell surpasses predetermined upper voltage limit; Perhaps be lower than predetermined lower voltage limit, judge whether the electrode extraction pole temperature of this cell is higher than the estimating temperature upper limit, or the low fixed temperature lower limit of intervening;

The monomer alarm module; Be electrically connected with said free state determination module; Be used for prescribing a time limit when the voltage of said cell surpasses predetermined upper voltage limit or is lower than predetermined voltage under; Perhaps, when the temperature of this cell is higher than the estimating temperature upper limit or is lower than under the predetermined temperature in limited time, send alarm signal to said upper strata controller and said customer controller.

Therefore; In the present embodiment; Because the voltage of each cell of synchro measure, bus current (promptly flowing through the electric current of each cell) are so the voltage, the interference in the electric current that obtain are basic identical; Promptly wherein interference waveform direction is identical, amplitude is basic identical, particularly, and the unanimity of disturbing at medium and low frequency.So in according to each above-mentioned voltage, bus current estimating battery group during the state-of-charge of each cell; Wherein disturb and to cancel each other; The balanced accuracy of controlling of state-of-charge that the signal that event utilizes these synchro measures to obtain carries out each cell is higher, and implements easily.

In addition; Present embodiment adopts simple 2 layers of distributed controlling and managing framework; Promptly unified upper strata controller and each monomer controller; Each monomer controller Be Controlled unit (each cell) with minimum respectively is corresponding one by one, helps guaranteeing that control management system keeps high reliability, high robust operation.

In addition; Adopt the present embodiment scheme; Each monomer controller execution that the bottom is transferred in control is measured, carried out to the bottom of part; Can reduce the live load of the upper strata controller of core greatly, make the upper strata controller not need the too high speed of service, help improving the high reliability of The whole control system.

In addition; In the present embodiment scheme, can also each monomer controller be separately fixed on the extraction electrode of each cell, no longer need the voltage of each cell be extracted measurement with long line; The voltage and the temperature data that are obtained are true and reliable; And further significantly reduced the interference signal of introducing in measuring, and eliminated long line short circuit, open circuit etc. and to cause the chance of fault, further improved reliability power battery group management.

Description of drawings

Accompanying drawing described herein is used to provide the further understanding to invention, constitutes the application's a part, does not constitute the improper qualification to invention, in the accompanying drawings:

A kind of power battery group management method flow sketch map that Fig. 1 provides for the embodiment of the invention 1;

A kind of power battery group management method flow sketch map that Fig. 2 provides for the embodiment of the invention 2;

A kind of power battery group management method flow sketch map that Fig. 3 provides for the embodiment of the invention 3;

The structural representation block diagram of a kind of power battery group management system that Fig. 4 provides for the embodiment of the invention 4;

The structural representation block diagram of a kind of power battery group management system that Fig. 5 provides for the embodiment of the invention 5;

The structural representation block diagram of a kind of power battery group management system that Fig. 6 provides for the embodiment of the invention 6;

The structural representation block diagram of a kind of power battery group management system that Fig. 7 provides for the embodiment of the invention 7;

The structural representation block diagram of a kind of power battery group management system that Fig. 8 provides for the embodiment of the invention 8.

Embodiment

To combine accompanying drawing and specific embodiment to specify this invention below, and be used for explaining invention in the illustrative examples of this invention and explanation, but not as the qualification to invention.

Embodiment 1:

Referring to shown in Figure 1, a kind of power battery group management method flow that present embodiment provides mainly comprises the steps:

Step 101: the voltage of each each cell of monomer controller synchro measure, and the voltage of each cell is sent to the upper strata controller.

(preferred but be not limited to be set directly on the electrode extraction pole of each cell) all is fixed with a monomer controller near each cell of forming this power battery pack; Monomer is controlled under the Synchronization Control of upper strata controller; Measure the voltage of the cell corresponding with this monomer controller respectively, the voltage with the cell that measures is sent to the upper strata controller respectively.

Step 102: the bus current of upper strata controller synchro measure power battery pack.

Power battery pack is composed in series by each cell, and its bus current is the electric current that flows through each cell, and the upper strata controller is measured bus current through to the whole bus current sampling of power battery pack.

When carrying out the bus current measurement; This is measured and the measurement synchronization of monomer controller to monomer battery voltage; So that the voltage measurement of bus current and each cell all keeps synchronous; Be that the bus current that the same time inputs to the upper strata controller, the voltage of each cell record at synchronization respectively, test environment, disturb all identical.

Because the voltage measurement of bus current and each cell is synchronous, so even in measuring process, be interfered, then disturb basic identically, promptly wherein interference waveform direction is identical, amplitude is basic identical, and is particularly, higher in the consistency of medium and low frequency interference.So in according to each above-mentioned voltage, bus current estimating battery group during the state-of-charge of each cell; Wherein disturb and to cancel each other; The balanced accuracy of controlling of state-of-charge that the signal that event utilizes these synchro measures to obtain carries out each cell is higher, and implements easily.

Step 103: the upper strata controller is estimated the state-of-charge of current each cell according to voltage signal, the bus current signal of each cell.

The upper strata controller is estimated the state-of-charge of each cell according to the voltage signal and the bus current signal of each cell.The state-of-charge evaluation method of each cell in this step can but be not limited to adopt such as estimations such as EKF integral algorithms, do not give unnecessary details at this.

Step 104: the upper strata controller sends charged balanced instruction according to the state-of-charge of each cell in the current power battery pack and the voltage of each cell to each monomer controller.

The upper strata controller is according to the state-of-charge (being the SOC estimated value in the step 104) of each cell that obtains; According to predetermined balanced control strategy; Confirm the charged balanced control mode of power battery pack, the corresponding monomer controller of cell that carries out charged equalization operation to needs issues charged balanced instruction.

In the present embodiment, can also further measure the temperature of each cell, further combine the temperature of each cell, estimate the state-of-charge of each cell.

Step 105: each monomer controller is according to the charged balanced instruction that receives, the quantity of electric charge of the cell that balanced this monomer controller connects.

The charged balanced instruction that each monomer controller issues according to the upper strata controller; The corresponding cell of this monomer controller is carried out charged equalization operation (charging or discharge); The state-of-charge of whole each cell is kept in balance; Guarantee that the state-of-charge of whole each cell meets user's demand, guarantees the fail safe of using.

Therefore; In the present embodiment; Because the voltage of each cell of synchro measure, bus current (promptly flowing through the electric current of each cell) are so the voltage, the interference in the electric current that obtain are basic identical; Promptly wherein interference waveform direction is identical, amplitude is basic identical, and particularly, the consistency of disturbing at medium and low frequency is higher.So in according to each above-mentioned monomer voltage, bus current estimating battery group during the state-of-charge of each cell; Wherein disturb and to cancel each other; The balanced accuracy of controlling of state-of-charge that the signal that event utilizes these synchro measures to obtain carries out each cell is higher, and implements easily.

In addition; Present embodiment adopts simple 2 layers of distributed controlling and managing framework; Promptly unified upper strata controller and each monomer controller; Each monomer controller Be Controlled unit (each cell) with minimum respectively is corresponding one by one, helps control management system and keeps high reliability, high robust operation.

In addition; Adopt the present embodiment scheme; Each monomer controller execution that the bottom is transferred in control is measured, carried out to the bottom of part; Can reduce the live load of the upper strata controller of core greatly, make the upper strata controller need not the too high speed of service, help improving the reliability of The whole control system.

In addition; In the present embodiment scheme, can also each monomer controller be separately fixed on the extraction electrode of each cell, no longer need the voltage of each cell be extracted measurement with long line; The voltage and the temperature data that are obtained are true and reliable; And further significantly reduced the interference signal of introducing in measuring, and eliminated long line short circuit, open circuit etc. and to cause the chance of fault, further improved reliability power battery group management.

Embodiment 2:

Referring to shown in Figure 2, present embodiment power battery group management method flow is with respect to being following with 1 difference of embodiment:

In the present embodiment can, be arranged on the electrode extraction pole of corresponding cell but be not limited to directly that each cell is corresponding monomer controller, make monomer controller and cell the most approaching.

The present embodiment flow process can also but be not limited to comprise following flow process:

Step 201: each monomer controller is measured the electrode extraction pole temperature of each cell, and the electrode extraction pole temperature of each cell is sent to the upper strata controller.

Temperature sensor on the electrode extraction pole of each cell is directly measured the temperature of this electrode extraction pole, and respectively with temperature transfer to the upper strata controller of electrode extraction pole.

Step 201 both can also can be after it before thestep 101.

Step 202: the upper strata controller receives the electrode extraction pole temperature of each cell.

After the upper strata controller was received the electrode extraction pole temperature of each monomer controller transmission, the upper strata controller carries out monitoring temperature according to these temperature to be handled.

Step 203: if arbitrary electrode extraction pole temperature surpasses predetermined temperature range, then execution in step 204,205; Otherwise, return.

Step 204: the upper strata controller starts outside humidity control system (air cooling equipment and/or heater), so that the temperature of each cell remains in the predetermined temperature range, guarantees whole power battery group operate as normal in the rational temperature environment.

Step 205: the upper strata controller sends heat alarm to customer controller.

Step 205 is a preferred steps, and the user can be further reminded in its warning, in time finds alert for the user, in time handles.

Therefore present embodiment is with respect to embodiment 1 scheme institute difference: because present embodiment is directly measured the temperature of electrode extraction pole of each cell as temperature controlled foundation, its temperature value is true and reliable.

In addition; In the present embodiment scheme, with all cells as temperature controlled foundation, so long as any one cell is when undesirable; It is the start-up temperature regulating system; Temperature to power battery pack is regulated, and guarantees that all cells all are operated under the desirable temperature, guarantees the fail safe that power battery pack is used.Rather than as in the prior art; In the battery case at power battery pack place, place one or more temperature sensors and carry out the air themperature detection as foundation; Prior art exists surveys blind spot; The temperature of possible partial monosomy battery is too high greatly, and the defective that temperature sensor can't in time obtain.

Embodiment 3:

Referring to shown in Figure 3, present embodiment flow process power battery group management method flow is with respect to being with 1 difference of embodiment:

In step 102: after the bus current of power battery pack is obtained in upper strata controller measurement, can also may further comprise the steps:

Step 301: the upper strata controller is confirmed the internal resistance of each cell according to the voltage of bus current and each cell.

The upper strata controller is confirmed the rate of change of said bus current and the rate of change of said each monomer battery voltage respectively according to the voltage of said bus current and said each cell; According to the rate of change of said each monomer battery voltage, the rate of change of bus current, calculate the internal resistance of confirming said each cell;

Because bus current, each monomer voltage synchro measure; So the voltage of each cell of recording of synchronization, the interference that electric current receives are identical; So can calculate voltage variety and current change quantity in the determining time; According to this voltage variety, current change quantity, adopt Ohm's law to obtain the internal resistance of each cell.

Step 302: when the internal resistance of arbitrary cell is higher than in the predetermined internal resistance in limited time execution instep 303; Otherwise return.

Step 303: the upper strata controller sends alarm signal to the customer controller on upper strata more.

Wherein step 301,302,303 both can be instep 103, before 104, also can be instep 103, after 104, and in the present embodiment only before step 103,104, being that example is as illustrative.

When the upper strata controller finds that the internal resistance of arbitrary cell is higher than the predetermined internal resistance upper limit (i.e. this cell generation slump of disastrous proportions); The upper strata controller sends alarm signal to the customer controller on upper strata more; To remind the decline situation of this cell of user; Change this cell as early as possible, avoid this cell that the whole power battery group is produced worse influence, help guaranteeing the safe and reliable use of whole each power battery pack.

Therefore; Present embodiment is except the beneficial effect with embodiment 1; Further help the slump of disastrous proportions that the user finds cell early,, further help guaranteeing the safe and reliable use of whole power battery pack so that the user in time changes the serious cell of decline.

Embodiment 4

Present embodiment power battery group management method flow is with respect to being following with 1 difference of embodiment:

At the voltage of each each cell of monomer controller synchro measure ofstep 101, and the voltage tester data of each cell are sent to after the controller of upper strata, can further include following flow process:

Step 401: each monomer controller judges respectively whether the voltage of current cell surpasses predetermined upper voltage limit or be lower than the predetermined voltage lower limit, and judges whether the temperature of current cell is higher than the estimating temperature upper limit or is lower than the predetermined temperature lower limit.

Step 402: the voltage of finding current cell when arbitrary monomer controller surpasses predetermined upper voltage limit, or is lower than predetermined voltage under and prescribes a time limit; Perhaps, the electrode extraction pole temperature of current cell is higher than the estimating temperature upper limit, or is lower than under the predetermined temperature in limited time execution in step 403; Otherwise return.

The voltage of finding current cell when arbitrary monomer controller surpasses predetermined upper voltage limit, or is lower than predetermined voltage under and prescribes a time limit; Perhaps, the electrode extraction pole temperature of current cell is higher than the estimating temperature upper limit, or is lower than under the predetermined temperature in limited time, and then this monomer controller thinks that the corresponding cell of this monomer controller is in the abnormal state state.

Step 403: this monomer controller directly sends alarm signal to upper strata controller and customer controller.

When arbitrary cell was in abnormality, the corresponding monomer controller of this cell also directly sent alarm signal to customer controller through hardware circuit except directly to the upper strata controller sends alarm signal.Realize dual warning, especially, when controller lost efficacy on the upper strata, each monomer controller can directly be sent to customer controller with alert, in time to notify the user, the reliability of further favourable raising power battery group management.

Embodiment 5

Referring to shown in Figure 5, this power battery group management system mainly comprises a upper strata controller 500 and at least two monomer controllers 501, and each monomer controller 501 is connected with these upper strata controller 500 hardware circuits respectively.

Wherein, upper strata controller 500 can but be not limited to comprise: upper strata synchronization module 5001, bus current measurement module 5002, upper strata state-of-charge estimation block 5004, the charged computable general equilibrium module 5005 in upper strata.The annexation and the operation principle of each several part are following:

Upper strata synchronization module 5001 is used to provide synchronizing signal, thereby test synchronization signals is provided for the bus current of 5002 pairs of power battery pack of bus current measurement module in the voltage tester of 501 pairs of each cells of monomer controller and this upper strata controller 500.

Bus current measurement module 5002 is electrically connected with upper strata synchronization module 5001, under the driving of this synchronizing signal, measures the bus current of power battery pack,

Because power battery pack is composed in series by all cells, so this bus current is the electric current that flows through each cell.

Upper strata state-of-charge estimation block 5004 is electrically connected with bus current measurement module 5004, is used for voltage, temperature and bus current according to each cell, the state-of-charge of each cell in the estimation power battery pack.

The charged computable general equilibrium module 5005 in upper strata is electrically connected with upper strata state-of-charge estimation block 5004; Be used for according to the current battery charge state and the voltage of each cell; Confirm the decision-making of charged computable general equilibrium, and send charged balanced instruction to each monomer controller 501.

Wherein, each monomer controller 501 respectively can but be not limited to comprise: the charged balance module of monomer voltage test module 5011, monomer 5012, monomer temperature test module.

Wherein, Each monomer voltage test module 5011; Under the synchronizing signal of upper strata synchronization module 5011 drives, measure the voltage signal of the cell that is connected with this monomer controller 501 respectively, the voltage measurement signal with this cell is sent to upper strata controller 500 respectively.

The charged balance module 5012 of monomer, the quantity of electric charge of the balanced cell that is connected with this monomer controller 501 of charged balanced instruction that is used for issuing according to upper strata controller 500.

The operation principle of this enforcement power battery group management system can but be not limited to describe said like the relevant work flow process among the embodiment 1, do not give unnecessary details at this.

In the present embodiment both can be as illustrated in fig. 4, each monomer controller 501 is electrically connected with upper strata controller 500 respectively through lead respectively.But convenient in order to make that circuit connects, can also adopt circuit implementation structure shown in Figure 5:

In Fig. 5; Each monomer controller 501 is separately positioned on the monomer control circuit board 502; Each monomer control circuit board 502 hardware circuit in order connects; Whole head and the tail and upper strata controller 500 that the monomer control circuit board 502 that is connected by hardware circuit in order constitutes, monomer control circuit board 502, upper strata controller 500 form closed loops like this, and the circuit structure enforcement shown in Figure 5 of experiment proof is convenient.

Therefore; In the present embodiment; Because the voltage of each cell of synchro measure, bus current (promptly flowing through the electric current of each cell) are so the voltage, the interference in the electric current that obtain are basic identical; Promptly wherein interference waveform direction is identical, amplitude is basic identical, and particularly, the consistency of disturbing at medium and low frequency is higher.So the time according to the state-of-charge of each above-mentioned monomer battery voltage, bus current estimating battery group; Wherein disturb and to cancel each other; The balanced accuracy of controlling of state-of-charge that the signal that event utilizes these synchro measures to obtain carries out each cell is higher, and implements easily.

In addition; Present embodiment adopts simple 2 layers of distributed controlling and managing framework; Promptly unified upper strata controller and each monomer controller 501; Each monomer controller 501 Be Controlled unit (each cell) with minimum respectively is corresponding one by one, helps guaranteeing that control management system keeps high reliability, high robust operation.

In addition; Adopt the present embodiment scheme; Each monomer controller 501 execution that the bottom is transferred in control are measured, carried out to the bottom of part; Can reduce the live load of the upper strata controller 500 of core greatly, make upper strata controller 500 need not the too high speed of service, help improving the high reliability of The whole control system.

In addition; In the present embodiment scheme, can also each monomer controller 501 be separately fixed on the extraction electrode of each cell, no longer need the voltage of each cell be extracted measurement with long line; The voltage and the temperature data that are obtained are true and reliable; And further significantly reduced the interference signal of introducing in measuring, and eliminated long line short circuit, open circuit etc. and to cause the chance of fault, further improved reliability power battery group management.

Embodiment 6

Referring to shown in Figure 6, present embodiment power battery group management system is with respect to 5 differences of embodiment:

Monomer controller 501 is separately positioned on the electrode extraction pole of each cell, each monomer controller 501 also respectively can but be not limited to comprise: monomer temperature detecting module 601.

Correspondingly, upper strata controller 500 can also but be not limited to comprise: upper strata temperature control modules 602.

Its operation principle is mainly following:

Each monomer temperature detecting module 601 is surveyed the electrode extraction pole temperature with the cell at this monomer controller place, and the temperature of this electrode extraction pole is sent to upper strata controller 500.

Upper strata temperature control modules 602 in the upper strata controller 500 carries out temperature control according to the temperature of all cells of receiving; When arbitrary electrode extraction pole temperature surpasses predetermined scope; Upper strata temperature control modules 602 promptly starts outside humidity control system, and the temperature of said each cell is all remained in the said predetermined temperature range.

The operation principle of above-mentioned module and further beneficial effect can but be not limited to like embodiment 2 saidly, do not give unnecessary details at this.

Embodiment 7:

Referring to shown in Figure 7, present embodiment power battery group management system is with respect to 5 differences of embodiment:

This upper strata controller 500 can also comprise: upper strata internal resistance computing module 701, internal resistance alarm module 702.Wherein concrete annexation and operation principle are following:

Upper strata internal resistance computing module 701 is electrically connected with bus current measurement module 5002; Internal resistance computing module 701 in upper strata is according to the voltage of bus current and each cell; Confirm the rate of change of bus current and the rate of change of each monomer battery voltage respectively; According to the rate of change of each monomer battery voltage, the rate of change of bus current, calculate the internal resistance of confirming each cell.

Internal resistance alarm module 702; Being higher than the predetermined internal resistance upper limit in the internal resistance of arbitrary cell (is arbitrary cell generation slump of disastrous proportions; Its actual available capacity is significantly less than specified requirement) time, internal resistance alarm module 702 sends alarm signal, this cell of reminding user to replace to customer controller 700; Avoid this cell that further chain bad influence is taken place the whole power battery group, further guarantee the fail safe that power battery pack is used.

The operation principle of above-mentioned module and further beneficial effect can but be not limited to like embodiment 3 saidly, do not give unnecessary details at this.

Embodiment 8:

Referring to shown in Figure 8, the power battery group management system of present embodiment is with respect to 5 differences of embodiment:

Each monomer controller 501 also directly is connected with said customer controller 700 direct hardware circuits;

Each monomer controller 501 also can further comprise respectively: free state determination module 800, monomer alarm module 801.

Free state determination module 800 is electrically connected with monomer voltage measurement module 5011, temperature detecting module 601.Monomer alarm module 801 is electrically connected with free state determination module 800.

Free state determination module 800 is used to judge whether the voltage of this cell surpasses predetermined upper voltage limit; Perhaps be lower than predetermined lower voltage limit; Whether the electrode extraction pole temperature of judging this cell is higher than the estimating temperature upper limit, or is lower than the predetermined temperature lower limit.As long as above-mentioned arbitrary condition meets, think that then current cell is in abnormality.

This monomer alarm module 801 except sending the alarm signal to upper strata controller 500, also sends alarm signal to customer controller 700 when free state determination module 800 thinks that cell is in abnormality.

More than the technical scheme that inventive embodiments provided has been carried out detailed introduction, used concrete example among this paper the principle and the execution mode of inventive embodiments set forth, the explanation of above embodiment only is applicable to the principle that helps to understand inventive embodiments; Simultaneously, for one of ordinary skill in the art, according to inventive embodiments, the part that on embodiment and range of application, all can change, in sum, this description should not be construed as the restriction to invention.

Claims (11)

1. a power battery group management method is characterized in that, comprising:

Each monomer controller synchro measure obtains the voltage of each cell, and the voltage of said each cell is sent to the upper strata controller;

When upper strata controller and said monomer controller are measured the voltage of cell, synchronously measure the bus current that obtains power battery pack, wherein said power battery pack is composed in series by said each cell;

Said upper strata controller is estimated the state-of-charge of current said each cell according to the voltage and the bus current of said each cell;

Said upper strata controller sends charged balanced instruction according to the state-of-charge of current said power battery pack and the voltage of said each cell to said each monomer controller;

Said each monomer controller is according to the charged balanced instruction that receives, the quantity of electric charge of the cell that balanced this monomer controller connects.

2. power battery group management method according to claim 1 is characterized in that,

In said step: the upper strata controller also comprised before said each monomer controller sends charged balanced instruction:

Said each monomer controller is measured the temperature of each cell, and said temperature value is sent to the upper strata controller;

Said upper strata controller specifically is according to the voltage of said each cell and bus current, temperature value, estimates the state-of-charge of current said each cell.

3. power battery group management method according to claim 1 and 2 is characterized in that,

Said each monomer controller is separately positioned on the electrode extraction pole of said each cell.

4. power battery group management method according to claim 3 is characterized in that, also comprises:

The electrode extraction pole temperature of said each cell of said each monomer controling appliance bulk measurement is as the temperature of said each cell;

When the temperature of arbitrary cell surpassed predetermined temperature range, said upper strata controller started outside humidity control system, and the temperature of said each cell is all remained in the said predetermined temperature range.

5. power battery group management method according to claim 1 and 2 is characterized in that,

In step: the controller measurement of said upper strata also comprises after obtaining the bus current of power battery pack:

Said upper strata controller is according to the voltage of said bus current and said each cell; Confirm the bus current variable quantity of a determining time and the voltage variety of said each cell respectively; According to the voltage variety of said bus current variable quantity and said each cell, calculate the internal resistance of confirming said each cell;

When the internal resistance of arbitrary cell is higher than in the predetermined internal resistance in limited time, said upper strata controller sends alarm signal to customer controller.

6. power battery group management method according to claim 4 is characterized in that, comprising:

In step: each monomer controller synchro measure also comprises after obtaining the voltage of each cell:

When the voltage of said arbitrary cell surpasses predetermined upper voltage limit, or when being lower than predetermined lower voltage limit,

Perhaps, when the electrode extraction pole temperature of said arbitrary cell is higher than the estimating temperature upper limit, or be lower than under the predetermined temperature in limited time;

Said monomer controller sends alarm signal to said upper strata controller and said customer controller.

7. a power battery group management system is characterized in that, comprising:

A upper strata controller and at least two monomer controllers, said each monomer controller are connected with said upper strata controller hardware circuit respectively;

Wherein, said upper strata controller comprises:

The upper strata synchronization module is used to provide synchronizing signal;

The bus current measurement module is electrically connected with said upper strata synchronization module, is used under the driving of said synchronizing signal, measures the bus current that obtains power battery pack, and wherein said power battery pack is composed in series by said each cell;

Upper strata state-of-charge estimation block is electrically connected with said bus current measurement module, is used for voltage and bus current according to said each cell, estimates the state-of-charge of current said each cell;

The charged balance module in upper strata is electrically connected with said upper strata state-of-charge estimation block, is used for according to the state-of-charge of current said each cell and the voltage of said each cell, sends charged balanced instruction to said each monomer controller;

Said each monomer controller comprises respectively:

The monomer voltage test module is connected with said upper strata synchronization module, is used under the driving of said synchronizing signal, measures the voltage obtain the cell that is connected with this monomer controller, and the voltage of said each cell is sent to said upper strata controller;

The charged balance module of monomer is used for instructing the quantity of electric charge of the balanced cell that is connected with this monomer controller according to the charged equilibrium that said upper strata controller issues.

8. power battery group management according to claim 7 system is characterized in that,

Said each monomer controller is separately positioned on the electrode extraction pole of said each cell.

9. power battery group management according to claim 8 system is characterized in that,

Said each monomer controller also comprises respectively:

The monomer temperature detecting module is used to survey the electrode extraction pole temperature with the cell at this monomer controller place, and the temperature of said electrode extraction pole is sent to said upper strata controller;

Said upper strata controller also comprises:

The upper strata temperature control modules is used for when arbitrary electrode extraction pole temperature surpasses predetermined scope, starting outside humidity control system, and the temperature of said each cell is all remained in the said predetermined temperature range.

10. according to claim 7 or 8 or 9 described power battery group management systems, it is characterized in that,

Said upper strata controller also comprises:

Monomer internal resistance computing module; Be electrically connected with said bus current measurement module; Be used for voltage according to said bus current and said each cell; Confirm the rate of change of said bus current and the rate of change of said each monomer battery voltage respectively,, calculate the internal resistance of confirming said each cell according to the rate of change of said each monomer battery voltage, the rate of change of bus current;

The internal resistance alarm module is used for internal resistance when arbitrary cell and is higher than in the predetermined internal resistance in limited time, and institute sends alarm signal to customer controller.

11. power battery group management according to claim 10 system is characterized in that,

Said each monomer controller also directly is connected with said customer controller hardware circuit;

Said each monomer controller also comprises:

The free state determination module; Be electrically connected with said monomer voltage measurement module, temperature detecting module respectively; Be used to judge whether the voltage of this cell surpasses predetermined upper voltage limit; Perhaps be lower than predetermined lower voltage limit, judge whether the electrode extraction pole temperature of this cell is higher than the estimating temperature upper limit, or be lower than the predetermined temperature lower limit;

The monomer alarm module; Be electrically connected with said free state determination module; Be used for prescribing a time limit when the voltage of said cell surpasses predetermined upper voltage limit or is lower than predetermined voltage under; Perhaps, when the temperature of this cell is higher than the estimating temperature upper limit or is lower than under the predetermined temperature in limited time, send alarm signal to said upper strata controller and said customer controller.

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