CN110949178A - Intelligent lithium battery parallel management control system and method - Google Patents
Intelligent lithium battery parallel management control system and methodDownload PDFInfo
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- WHXSMMKQMYFTQS-UHFFFAOYSA-NLithiumChemical compound[Li]WHXSMMKQMYFTQS-UHFFFAOYSA-N0.000titleclaimsabstractdescription312
- 229910052744lithiumInorganic materials0.000titleclaimsabstractdescription312
- 238000000034methodMethods0.000titleclaimsabstractdescription24
- 238000007599dischargingMethods0.000claimsabstractdescription48
- 230000002159abnormal effectEffects0.000claimsdescription18
- 230000005856abnormalityEffects0.000claimsdescription16
- 238000010586diagramMethods0.000description2
- 230000009286beneficial effectEffects0.000description1
- OJIJEKBXJYRIBZ-UHFFFAOYSA-Ncadmium nickelChemical compound[Ni].[Cd]OJIJEKBXJYRIBZ-UHFFFAOYSA-N0.000description1
- 230000006727cell lossEffects0.000description1
- 230000009977dual effectEffects0.000description1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/18—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries of two or more battery modules
- B60L58/22—Balancing the charge of battery modules
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4207—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells for several batteries or cells simultaneously or sequentially
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M10/4257—Smart batteries, e.g. electronic circuits inside the housing of the cells or batteries
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
- H01M10/441—Methods for charging or discharging for several batteries or cells simultaneously or sequentially
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M2010/4278—Systems for data transfer from batteries, e.g. transfer of battery parameters to a controller, data transferred between battery controller and main controller
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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Abstract
Description
Technical Field
The invention belongs to the technical field of lithium battery management, and particularly relates to an intelligent lithium battery parallel management control system and method.
Background
At present, lithium batteries are adopted for supplying power for electric vehicles, the lithium batteries are not similar to nickel-cadmium batteries and nickel-hydrogen batteries, and the requirements on charging and discharging are high due to high energy density.
Electric bicycles and electric motorcycles in the market adopt a single lithium battery power supply system, and the use experience of customers can be seriously influenced after the lithium battery power supply system goes wrong; in addition, under the condition of high-power use, the single lithium battery has the problem of excessive heating of the lithium battery caused by large-current discharge.
However, if the dual lithium batteries are used for supplying power in parallel, the loss of the two lithium batteries will be different with the lapse of service time, and thus, a voltage difference will occur between the two lithium batteries connected in parallel in the use process. And, along with the difference grow of two lithium cell losses, the difference of voltage difference also can be bigger and bigger, when charging and discharging, can appear the phenomenon that inside was filled each other between two lithium cells, not only very big to the loss of lithium cell, the stability of whole power supply line also can receive the influence, and then influences the safety in utilization of electric motor car.
Disclosure of Invention
The invention provides an intelligent lithium battery parallel management control system, aiming at the problems that in the prior art, as the difference of the losses of two lithium batteries is increased, the difference of voltage difference is increased, and internal mutual charging phenomenon can occur between the two lithium batteries during charging and discharging, so that the losses of the lithium batteries are large, the stability of the whole power supply line is also influenced, and the use safety of an electric vehicle is further influenced.
The basic scheme provided by the invention is as follows:
an intelligent lithium battery parallel management control system comprises a lithium battery with a BMS;
the number of the lithium batteries is two, and the two lithium batteries are connected in parallel and used for supplying power to the electric vehicle; the two lithium batteries are respectively a main battery and an auxiliary battery, and the BMS of the main battery is in communication connection with the BMS of the auxiliary battery;
the BMS of the main battery comprises an acquisition unit, a charging protection unit and a discharging protection unit;
the acquisition unit is used for acquiring the state information of the main battery and also used for acquiring the state information of the auxiliary battery through the BMS of the auxiliary battery, and the state information comprises voltage information;
the charging protection unit is used for judging whether the voltage difference of the two lithium batteries exceeds a preset voltage difference threshold value or not according to the collected voltage information when the lithium batteries are charged, and if the voltage difference exceeds the preset voltage difference threshold value, the lithium batteries with higher voltage are controlled to be disconnected from charging;
the discharging protection unit is used for judging whether the voltage difference of the two lithium batteries exceeds a preset voltage difference threshold value according to the collected voltage information when the lithium batteries discharge, and if the voltage difference exceeds the preset voltage difference threshold value, the lithium batteries with lower voltage are controlled to be disconnected for discharging.
The noun explains: BMS, the battery management system of lithium cell oneself promptly, through BMS, can gather the state information of lithium cell to control lithium cell charge, discharge or disconnection.
Basic scheme theory of operation and beneficial effect:
under the normal condition, two parallelly connected lithium cells are the electric motor car power supply jointly, compare with single lithium cell power supply, can reduce single lithium cell generate heat, and then reduce the potential safety hazard.
When the lithium battery discharges, namely the lithium battery supplies power for the electric vehicle, after the acquisition unit of the BMS of the main battery acquires the voltage information of the two lithium batteries, the discharge protection unit of the BMS of the main battery judges whether the voltage difference between the two lithium batteries exceeds a preset pressure difference threshold value according to the voltage information of the lithium batteries. If the voltage difference between the two lithium batteries exceeds a preset voltage difference threshold value, the risk of mutual charging between the lithium batteries is indicated.
At the moment, the discharge protection unit controls the lithium battery with lower voltage to cut off discharge, and the lithium battery with higher voltage is used for supplying power independently; when the voltage difference between the two lithium batteries is smaller than the voltage difference threshold value and the risk of mutual charging does not exist between the lithium batteries, the two lithium batteries supply power together. Like this, appear when can avoiding two lithium batteries to discharge and fill each other, influence the life of lithium cell and the stability of electric motor car, reduce the use risk of electric motor car.
Similarly, when the lithium batteries are charged, the acquisition unit acquires the voltage information of the two lithium batteries, and the charging protection unit judges whether the voltage difference between the two lithium batteries exceeds a preset voltage difference threshold value according to the voltage information. If the voltage difference between the two lithium batteries exceeds a preset voltage difference threshold value, the risk of mutual charging between the lithium batteries is indicated. At the moment, the charging protection unit controls the lithium battery with higher voltage to cut off charging and independently charges the lithium battery with lower voltage; when the voltage difference between the two lithium batteries is smaller than the voltage difference threshold value and the risk of mutual charging does not exist between the lithium batteries, the two lithium batteries are charged together. The mutual charging of the two lithium batteries can be avoided, and the service life of the lithium batteries is influenced.
The specific value of the differential pressure threshold value can be specifically set by a person skilled in the art according to the specific model of the electric vehicle and the specific capacity of the lithium battery.
Compared with the prior art, the lithium battery charging and discharging device has the advantages that mutual charging between the lithium batteries can be avoided when the lithium batteries are charged and discharged, the loss of the lithium batteries is reduced, and meanwhile, the electric vehicle is more stable to use.
Further, the state information acquired by the acquisition unit also comprises the temperature of the lithium battery;
the BMS of the main battery further comprises a switching unit, wherein a temperature threshold value is prestored in the switching unit, the switching unit is used for independently supplying power to the lithium battery with higher voltage, and controlling the lithium battery with lower voltage to start discharging when the working temperature of the lithium battery with higher voltage exceeds the temperature threshold value, and controlling the lithium battery with higher voltage to be disconnected and discharged after X seconds.
After the discharge protection unit disconnects the lithium battery with lower voltage, the electric vehicle is in a single lithium battery power supply mode, and under the condition of a relatively high vehicle speed, the problem that the lithium battery (namely, the lithium battery with higher voltage) for power supply generates heat excessively due to large-current discharge easily occurs.
At this moment, if the working temperature of the lithium battery with higher voltage exceeds the temperature threshold, the switching unit can be powered on by the lithium battery with lower voltage, and the lithium battery with higher voltage is disconnected after X seconds, so that the switching of the power supply lithium battery is completed, and the temperature of the lithium battery with higher voltage is prevented from being too high.
Further, the switching unit is also used for controlling the lithium battery with higher voltage to start discharging when the lithium battery with lower voltage is independently powered and the working temperature of the lithium battery with lower voltage exceeds the temperature threshold, and controlling the lithium battery with lower voltage to stop discharging after X seconds.
After the lithium battery with lower voltage is switched to independently supply power, the risk of overhigh temperature of the lithium battery also exists. Through the arrangement, when the lithium battery with lower voltage is independently used for supplying power and the temperature is higher, the switching unit of the controller can also switch the lithium battery for supplying power, so that the over-high temperature of the lithium battery for supplying power is prevented.
Further, a controller is included, the controller being in communication with the BMS of the main battery; the controller comprises a speed limit prompting unit, a speed limit value is prestored in the speed limit prompting unit, and the speed limit prompting unit is used for giving a prompt of not exceeding the speed limit value when the main battery or the auxiliary battery is singly discharged.
When the main battery or the auxiliary battery discharges independently, the electric vehicle is in a state of power supply of a single lithium battery, if the running speed of the electric vehicle exceeds a speed limit value, the power supply lithium battery can generate a large amount of heat, the service life of the lithium battery is influenced, and the stability of the electric vehicle is also influenced. At this time, the speed limit prompting unit of the controller sends out a prompt of not exceeding the speed limit value, so that the condition can be prevented.
Further, the BMS of the main battery further includes an abnormality determination unit and a lithium battery protection unit;
the abnormality judgment unit is used for judging the state of the lithium battery according to the state information of the lithium battery;
the lithium battery protection unit is used for controlling the lithium battery in the abnormal state to cut off discharging or cut off charging when the judgment result of the abnormality judgment unit is that the lithium battery is in the abnormal state.
Therefore, when the state of the lithium battery is abnormal (such as overcurrent, overvoltage or short circuit), the abnormal judgment unit of the controller can timely find out that the lithium battery protection unit can timely control the lithium battery in the abnormal state to be disconnected for discharging or disconnected for charging, and further the use risk of the electric vehicle is reduced.
Based on the system, the application also provides an intelligent lithium battery parallel management control method, which comprises the following steps:
the method comprises the steps of collecting state information of two lithium batteries, wherein the state information comprises voltage information;
a charging protection step, during charging of the lithium batteries, judging whether the voltage difference of the two lithium batteries exceeds a preset voltage difference threshold value or not according to the collected voltage information, and if so, controlling the lithium battery with higher voltage to disconnect charging;
and a discharge protection step, wherein when the lithium batteries discharge, whether the voltage difference of the two lithium batteries exceeds a preset voltage difference threshold value is judged according to the collected voltage information, and if the voltage difference exceeds the preset voltage difference threshold value, the lithium batteries with lower voltage are controlled to be disconnected for discharge.
Compared with the prior art, the method can avoid mutual charging among the lithium batteries when the lithium batteries are charged and discharged, reduce the loss of the lithium batteries and ensure that the electric vehicle is more stable to use.
Further, the state information collected in the collecting step also comprises the temperature of the lithium battery;
the method further comprises a switching step, when the lithium battery with higher voltage is independently powered and the working temperature of the lithium battery with higher voltage exceeds a temperature threshold, the lithium battery with lower voltage is controlled to start discharging, and after X seconds, the lithium battery with higher voltage is controlled to be disconnected from discharging.
If the working temperature of the lithium battery with higher voltage exceeds the temperature threshold, the switching step can control the lithium battery with lower voltage to start discharging, and after X seconds, the lithium battery with higher voltage is controlled to be disconnected to discharge, so that the switching of the power supply lithium battery is completed, and the temperature of the lithium battery with higher voltage is prevented from being too high.
Further, in the switching step, when the lithium battery with lower voltage is independently powered and the working temperature of the lithium battery with lower voltage exceeds the temperature threshold, the lithium battery with higher voltage is controlled to start discharging, and after X seconds, the lithium battery with lower voltage is controlled to stop discharging.
Therefore, when the lithium battery with lower voltage supplies power independently and the temperature is higher, the switching step can also switch the lithium battery for supplying power, so that the over-high temperature of the lithium battery for supplying power is prevented.
Furthermore, the method also comprises a speed limit prompting step, wherein when the main battery or the auxiliary battery discharges independently, a prompt of not exceeding the speed limit value is sent out.
When the main battery or the auxiliary battery discharges independently, the prompt of not exceeding the speed limit value is sent out, so that the situation that the lithium battery supplying power generates a large amount of heat, the service life of the lithium battery is influenced, and the stability of the electric vehicle is influenced can be prevented.
Further, an abnormality judgment step and a lithium battery protection step are also included;
an abnormality judgment step of judging the state of the lithium battery according to the state information of the lithium battery;
and a lithium battery protection step, wherein when the judgment result of the abnormality judgment step is that the lithium battery is abnormal, the lithium battery in the abnormal state is controlled to be disconnected from discharging or charging.
Therefore, when the state of the lithium battery is abnormal (such as overcurrent, overvoltage or short circuit), the lithium battery in the abnormal state can be disconnected for discharging or disconnected for charging in time, and the use risk of the electric vehicle is further reduced.
Drawings
Fig. 1 is a logic block diagram of a first embodiment of an intelligent lithium battery parallel management control system according to the present invention;
fig. 2 is a logic block diagram of a second embodiment of an intelligent lithium battery parallel management control system according to the present invention;
fig. 3 is a flowchart of a second embodiment of an intelligent lithium battery parallel management control method according to the present invention.
Detailed Description
The following is further detailed by way of specific embodiments:
example one
As shown in fig. 1, an intelligent lithium battery parallel management control system includes two lithium batteries connected in parallel.
Two parallelly connected lithium batteries are used for supplying power for the electric motor car, and two lithium batteries all have BMS. The two lithium batteries are respectively a main battery and an auxiliary battery, and the BMS of the main battery is communicated with the BMS of the auxiliary battery.
The BMS of the main battery comprises an acquisition unit, a charging protection unit, a discharging protection unit, a switching unit, an abnormality judgment unit and a lithium battery protection unit.
The acquisition unit is used for acquiring the state information of the main battery and also used for acquiring the state information of the auxiliary battery through the BMS of the auxiliary battery, wherein the state information comprises voltage, current and temperature.
The charging protection unit is used for judging whether the voltage difference of the two lithium batteries exceeds a preset voltage difference threshold value according to the collected voltage information when the lithium batteries are charged, and if the voltage difference exceeds the preset voltage difference threshold value, the lithium batteries with higher voltage are controlled to be disconnected for charging.
The discharging protection unit is used for judging whether the voltage difference of the two lithium batteries exceeds a preset voltage difference threshold value according to the collected voltage information when the lithium batteries discharge, and if the voltage difference exceeds the preset voltage difference threshold value, the lithium batteries with lower voltage are controlled to be disconnected for discharging.
The switching unit is internally pre-stored with a temperature threshold and used for controlling the lithium battery with lower voltage to start discharging when the lithium battery with higher voltage supplies power independently and the working temperature of the lithium battery with higher voltage exceeds the temperature threshold, and controlling the lithium battery with higher voltage to stop discharging after X seconds.
The switching unit is also used for controlling the lithium battery with higher voltage to start discharging when the lithium battery with lower voltage is independently powered and the working temperature of the lithium battery with lower voltage exceeds a temperature threshold value, and controlling the lithium battery with lower voltage to stop discharging after X seconds.
The abnormality judgment unit is used for judging the state of the lithium battery according to the state information of the lithium battery;
the lithium battery protection unit is used for controlling the lithium battery in the abnormal state to cut off discharging or cut off charging when the judgment result of the abnormality judgment unit is that the lithium battery is in the abnormal state.
Under the normal condition, two parallelly connected lithium cells are the electric motor car power supply jointly, compare with single lithium cell power supply, can reduce single lithium cell generate heat, and then reduce the potential safety hazard.
When the lithium batteries are discharged, namely the lithium batteries supply power to the electric vehicle, the collecting unit collects the voltage information of the lithium batteries, and the discharge protection unit judges whether the voltage difference between the two lithium batteries exceeds a preset voltage difference threshold value or not according to the voltage information. If the voltage difference between the two lithium batteries exceeds a preset voltage difference threshold value, the risk of mutual charging between the lithium batteries is indicated.
At the moment, the discharge protection unit controls the lithium battery with lower voltage to cut off discharge, and the lithium battery with higher voltage is used for supplying power independently; when the voltage difference between the two lithium batteries is smaller than the voltage difference threshold value and the risk of mutual charging does not exist between the lithium batteries, the two lithium batteries supply power together. Like this, appear when can avoiding two lithium batteries to discharge and fill each other, influence the life of lithium cell and the stability of electric motor car, reduce the use risk of electric motor car.
Similarly, when the lithium batteries are charged, the acquisition unit acquires the voltage information of the two lithium batteries, and the charging protection unit judges whether the voltage difference between the two lithium batteries exceeds a preset voltage difference threshold value according to the voltage information. If the voltage difference between the two lithium batteries exceeds a preset voltage difference threshold value, the risk of mutual charging between the lithium batteries is indicated. At the moment, the charging protection unit controls the lithium battery with higher voltage to cut off charging and independently charges the lithium battery with lower voltage; when the voltage difference between the two lithium batteries is smaller than the voltage difference threshold value and the risk of mutual charging does not exist between the lithium batteries, the two lithium batteries are charged together. The mutual charging of the two lithium batteries can be avoided, and the service life of the lithium batteries is influenced.
The specific value of the differential pressure threshold value can be specifically set by a person skilled in the art according to the specific model of the electric vehicle and the specific capacity of the lithium battery.
When the single lithium battery is used for supplying power, if the working temperature of the lithium battery with higher voltage exceeds a temperature threshold value, the switching unit of the controller can be used for switching on the lithium battery with lower voltage, and after X seconds, the lithium battery with higher voltage is switched off, so that the switching of the lithium battery with higher voltage is completed, and the temperature of the lithium battery with higher voltage is avoided from being too high. The specific value of X can be set by those skilled in the art according to the specific model of the electric vehicle and the specific capacity of the lithium battery.
After the lithium battery with lower voltage is switched to independently supply power, the risk of overhigh temperature of the lithium battery also exists. Through the arrangement, when the lithium battery with lower voltage is independently used for supplying power and the temperature is higher, the switching unit of the controller can also switch the lithium battery for supplying power, so that the over-high temperature of the lithium battery for supplying power is prevented.
Except this, when the state of lithium cell has unusually (like overcurrent, excessive pressure or short circuit), the unusual judgement unit of controller can discover in time, and lithium cell protection unit then can be in time control this abnormal state's lithium cell disconnection discharge, and then reduces the use risk of electric motor car.
Compared with the prior art, the lithium battery charging and discharging device has the advantages that mutual charging between the lithium batteries can be avoided when the lithium batteries are charged and discharged, the loss of the lithium batteries is reduced, and meanwhile, the electric vehicle is more stable to use.
Example two
As shown in fig. 2, unlike the first embodiment, the system in the present embodiment further includes a controller, which communicates with the main battery BMS. In this embodiment, the controller is a controller of the electric vehicle, and in other embodiments, controllers such as a single chip microcomputer can be used.
The controller comprises a speed limit prompting unit, a speed limit value is prestored in the speed limit prompting unit, and the speed limit prompting unit is used for giving a prompt of not exceeding the speed limit value when the main battery or the auxiliary battery is singly discharged. In the embodiment, the speed limit prompting unit is communicated with a vehicle-mounted display screen of the electric vehicle, and when the speed limit prompting unit gives a prompt, a text prompt asking for overspeed is displayed on the vehicle-mounted display screen.
When the discharge protection unit disconnects the lithium battery with lower voltage, the electric vehicle is in a state of power supply of a single lithium battery, if the running speed of the electric vehicle exceeds a speed limit value, the power supply lithium battery can generate a large amount of heat, the service life of the lithium battery is influenced, and the stability of the electric vehicle can also be influenced. Therefore, when the discharge protection unit cuts off the lithium battery with lower voltage, the speed limit prompting unit of the controller sends out a prompt of not exceeding the speed limit value, and the situation can be prevented. The specific data of the speed limit value can be specifically set by a person skilled in the art according to the specific model of the electric vehicle and the specific capacity of the lithium battery.
As shown in fig. 3, based on the foregoing system, this embodiment further provides an intelligent lithium battery parallel management control method, including:
the method comprises the steps of collecting state information of two lithium batteries, wherein the state information comprises voltage, current and temperature;
a charging protection step, during charging of the lithium batteries, judging whether the voltage difference of the two lithium batteries exceeds a preset voltage difference threshold value according to the collected voltage information, and if so, controlling the lithium battery with higher voltage to disconnect charging;
a discharge protection step, wherein when the lithium batteries are discharged, whether the voltage difference of the two lithium batteries exceeds a preset voltage difference threshold value is judged according to the collected voltage information, and if the voltage difference exceeds the preset voltage difference threshold value, the lithium batteries with lower voltage are controlled to be disconnected for discharging;
a speed limit prompting step, namely sending a prompt of not exceeding a speed limit value when the main battery or the auxiliary battery is singly discharged;
switching, namely, when the lithium battery with higher voltage is independently powered and the working temperature of the lithium battery with higher voltage exceeds a temperature threshold, controlling the lithium battery with lower voltage to start discharging, and after X seconds, controlling the lithium battery with higher voltage to stop discharging; when the lithium battery with lower voltage is independently powered and the working temperature of the lithium battery with lower voltage exceeds a temperature threshold, the lithium battery with higher voltage is controlled to start discharging, and after X seconds, the lithium battery with lower voltage is controlled to be disconnected from discharging.
An abnormality judgment step of judging the state of the lithium battery according to the state information of the lithium battery;
and a lithium battery protection step, wherein when the judgment result of the abnormality judgment step is that the lithium battery is abnormal, the BMS of the lithium battery with the abnormal state is controlled to cut off discharging or cut off charging.
The foregoing is merely an example of the present invention, and common general knowledge in the field of known specific structures and characteristics is not described herein in any greater extent than that known in the art at the filing date or prior to the priority date of the application, so that those skilled in the art can now appreciate that all of the above-described techniques in this field and have the ability to apply routine experimentation before this date can be combined with one or more of the present teachings to complete and implement the present invention, and that certain typical known structures or known methods do not pose any impediments to the implementation of the present invention by those skilled in the art. It should be noted that, for those skilled in the art, without departing from the structure of the present invention, several changes and modifications can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.
Claims (10)
1. An intelligent lithium battery parallel management control system comprises a lithium battery with a BMS; the method is characterized in that:
the number of the lithium batteries is two, and the two lithium batteries are connected in parallel and used for supplying power to the electric vehicle; the two lithium batteries are respectively a main battery and an auxiliary battery, and the BMS of the main battery is in communication connection with the BMS of the auxiliary battery;
the BMS of the main battery comprises an acquisition unit, a charging protection unit and a discharging protection unit;
the acquisition unit is used for acquiring the state information of the main battery and also used for acquiring the state information of the auxiliary battery through the BMS of the auxiliary battery, and the state information comprises voltage information;
the charging protection unit is used for judging whether the voltage difference of the two lithium batteries exceeds a preset voltage difference threshold value or not according to the collected voltage information when the lithium batteries are charged, and if the voltage difference exceeds the preset voltage difference threshold value, the lithium batteries with higher voltage are controlled to be disconnected from charging;
the discharging protection unit is used for judging whether the voltage difference of the two lithium batteries exceeds a preset voltage difference threshold value according to the collected voltage information when the lithium batteries discharge, and if the voltage difference exceeds the preset voltage difference threshold value, the lithium batteries with lower voltage are controlled to be disconnected for discharging.
2. The intelligent lithium battery parallel management control system according to claim 1, characterized in that: the state information acquired by the acquisition unit also comprises the temperature of the lithium battery;
the BMS of the main battery further comprises a switching unit, wherein a temperature threshold value is prestored in the switching unit, the switching unit is used for independently supplying power to the lithium battery with higher voltage, and controlling the lithium battery with lower voltage to start discharging when the working temperature of the lithium battery with higher voltage exceeds the temperature threshold value, and controlling the lithium battery with higher voltage to be disconnected and discharged after X seconds.
3. The intelligent lithium battery parallel management control system according to claim 2, characterized in that: the switching unit is also used for controlling the lithium battery with higher voltage to start discharging when the lithium battery with lower voltage is independently powered and the working temperature of the lithium battery with lower voltage exceeds a temperature threshold value, and controlling the lithium battery with lower voltage to stop discharging after X seconds.
4. The intelligent lithium battery parallel management and control system of claim 3, wherein: the battery pack further comprises a controller, wherein the controller is communicated with the BMS of the main battery; the controller comprises a speed limit prompting unit, a speed limit value is prestored in the speed limit prompting unit, and the speed limit prompting unit is used for giving a prompt of not exceeding the speed limit value when the main battery or the auxiliary battery is singly discharged.
5. The intelligent lithium battery parallel management control system according to claim 1, characterized in that: the BMS of the main battery also comprises an abnormality judgment unit and a lithium battery protection unit;
the abnormality judgment unit is used for judging the state of the lithium battery according to the state information of the lithium battery;
the lithium battery protection unit is used for controlling the lithium battery in the abnormal state to cut off discharging or cut off charging when the judgment result of the abnormality judgment unit is that the lithium battery is in the abnormal state.
6. An intelligent lithium battery parallel management control method is characterized by comprising the following steps:
the method comprises the steps of collecting state information of two lithium batteries, wherein the state information comprises voltage information;
a charging protection step, during charging of the lithium batteries, judging whether the voltage difference of the two lithium batteries exceeds a preset voltage difference threshold value or not according to the collected voltage information, and if so, controlling the lithium battery with higher voltage to disconnect charging;
and a discharge protection step, wherein when the lithium batteries discharge, whether the voltage difference of the two lithium batteries exceeds a preset voltage difference threshold value is judged according to the collected voltage information, and if the voltage difference exceeds the preset voltage difference threshold value, the lithium batteries with lower voltage are controlled to be disconnected for discharge.
7. The intelligent lithium battery parallel management control method according to claim 6, characterized in that: the state information collected in the collecting step also comprises the temperature of the lithium battery;
the method further comprises a switching step, when the lithium battery with higher voltage is independently powered and the working temperature of the lithium battery with higher voltage exceeds a temperature threshold, the lithium battery with lower voltage is controlled to start discharging, and after X seconds, the lithium battery with higher voltage is controlled to be disconnected from discharging.
8. The intelligent lithium battery parallel management control method according to claim 7, characterized in that: in the switching step, when the lithium battery with lower voltage is independently powered and the working temperature of the lithium battery with lower voltage exceeds a temperature threshold, the lithium battery with higher voltage is controlled to start discharging, and after X seconds, the lithium battery with lower voltage is controlled to stop discharging.
9. The intelligent lithium battery parallel management control method according to claim 8, characterized in that: the method also comprises a speed limit prompting step, wherein when the main battery or the auxiliary battery discharges independently, a prompt of not exceeding the speed limit value is sent out.
10. The intelligent lithium battery parallel management control method according to claim 6, characterized in that: also includes the steps of abnormity judgment and lithium battery protection;
an abnormality judgment step of judging the state of the lithium battery according to the state information of the lithium battery;
and a lithium battery protection step, wherein when the judgment result of the abnormality judgment step is that the lithium battery is abnormal, the lithium battery in the abnormal state is controlled to be disconnected from discharging or charging.
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