CN115483722A - Power system with parallel control - Google Patents

Abstract

The invention relates to a power system with parallel control, which comprises a plurality of groups of independent battery packs, wherein each group of battery packs is connected to the input end of a control device in parallel, and the output end of the control device is connected with the input end of a motor. The invention can solve the circulation phenomenon caused by inconsistent electric quantity among the lithium ion battery packs in the parallel connection process of the lithium ion battery packs.

Description

Power system with parallel control

Technical Field

The invention relates to the technical field of lithium batteries for vehicles, in particular to a power system with parallel control.

Background

Along with the implementation of the domestic and foreign clean energy policy planning, the demand on clean energy is increasing, and under the guidance and promotion of policies, the industrialization of lithium ion batteries is rapidly promoted. The battery becomes the most widely applied battery of a new energy automobile, but the battery is connected in series and in parallel to form a battery pack in use. At present, as the main performances such as the capacity of a single lithium ion battery pack often cannot meet the use requirements of application scenes, a plurality of lithium ion battery packs need to be combined for use so as to adapt to the actual requirements of different users.

If the electric quantity of the plurality of battery packs is inconsistent in the parallel connection process, the problem that the lithium ion battery pack with high electric quantity and the lithium ion battery pack with low electric quantity are reversely charged, namely, the so-called backflow phenomenon, is caused, so that the fault that a management system in the lithium ion battery pack is damaged is caused, and the requirements of arbitrary parallel connection and intelligent management of a parallel system cannot be met.

Disclosure of Invention

In order to solve the technical problems, the invention aims to provide a power system with parallel control.

In order to achieve the purpose, the invention adopts the following technical scheme:

a power system with parallel control comprises a plurality of groups of independent battery packs, wherein each group of battery pack is connected to the input end of a control device in parallel, and the output end of the control device is connected with the input end of a motor;

the control device comprises a parallel control system mainboard, wherein a logic control module, a plurality of charging and discharging relays and a plurality of charging and discharging fuses are arranged on the parallel control system mainboard, the output end of a battery pack is connected with the input ends of the charging and discharging fuses, the output end of each battery pack is connected with the input end of the logic control module, the control end of the logic control module is connected with the input end of each charging and discharging relay, the discharge end of each charging and discharging relay is connected with the input end of a charging and discharging wire plug-in connector, the charging and discharging wire plug-in connectors are externally connected onto the parallel control system mainboard, the output ends of the charging and discharging wire plug-in connectors are connected with a motor, a DC-DC plug-in connector is externally connected onto the parallel control system mainboard, and the DC-DC plug-in connector is connected to the parallel control system mainboard through the DC-DC fuses and used for providing an external power supply.

Preferably, the power system with the parallel control is characterized in that the battery pack is at least provided with 3 groups, and the battery pack is arranged in an outer box of the power system.

Preferably, the control device is installed in a parallel control system outer box, and the parallel control system outer box is arranged on the outer side of the power system outer box.

Preferably, the power system with the parallel control is characterized in that an outer cover is arranged on the outer box of the parallel control system.

Preferably, the power system with the parallel control function is characterized in that an elastic clamping block is arranged in the outer box of the power system.

Preferably, the power system with parallel control is characterized in that a CAN communication plug is externally connected to a mainboard of the parallel control system, an input end of the CAN communication plug is connected with an output end of the logic control module, and the CAN communication plug is connected with the battery pack.

Preferably, the power system with parallel control is provided with 12V of the external power supply.

By means of the scheme, the invention at least has the following advantages:

the invention solves the problem of circulation current phenomenon caused by inconsistent electric quantity among the lithium ion battery packs in the parallel connection process of the lithium ion battery packs. Meanwhile, the parallel system can manage the available power requirement design idea according to the number of different battery packs.

The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to implement them in accordance with the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a powertrain connection diagram of the present invention;

fig. 3 is a diagram of an actual connection of the present invention.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

It is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the device or element so referred to must be in a particular orientation, constructed or operated in a particular orientation, and is not to be construed as limiting the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

Examples

As shown in fig. 1, fig. 2 and fig. 3, a power system with parallel control comprises a plurality ofindependent battery packs 1, eachbattery pack 1 is connected in parallel to an input end of acontrol device 2, and an output end of thecontrol device 2 is connected with an input end of amotor 3; thecontrol device 2 comprises a parallelcontrol system mainboard 21, alogic control module 22, a plurality of charge anddischarge relays 23 and a plurality of charge anddischarge fuses 24 are arranged on the parallelcontrol system mainboard 21, the output end of thebattery pack 1 is connected with the input ends of the charge anddischarge fuses 24, the output end of the charge anddischarge fuses 24 is connected with the input ends of the charge anddischarge relays 23, the output end of eachbattery pack 1 is connected with the input end of thelogic control module 22, the control end of thelogic control module 22 is connected with the input end of each charge anddischarge relay 23, the discharge end of the charge anddischarge relay 23 is connected with the input end of a charge and discharge wire plug-inconnector 27, the charge and discharge wire plug-inconnector 27 is externally connected to the parallelcontrol system mainboard 21, the output end of the charge and discharge wire plug-inconnector 27 is connected with themotor 3, a DC-DC plug-inconnector 25 is externally connected to the parallelcontrol system mainboard 21 through a DC-DC plug-DC connector 26 for providing an external power supply, a CAN communication plug-in 28 is externally connected to the parallelcontrol system mainboard 21, the input end of the CAN communication plug-in 28 is connected with the output end of theCAN communication module 22, and the fuse is connected with thebattery pack 1.

Thebattery pack 1 is at least provided with 3 groups, and thebattery pack 3 is arranged in theouter box 4 of the power system.

In the invention, thecontrol device 2 is arranged in a parallel control systemouter box 5, and the parallel control systemouter box 5 is arranged on the outer side of a power systemouter box 4.

Theouter box 5 of the parallel control system is provided with anouter cover 6.

Anelastic clamping block 7 is arranged in the power systemouter box 4.

The external power supply is 12V.

The logic control module of the present invention includes the following detection,

the system adopts a parallel connection access mode, after the battery pack is connected to a mainboard of a parallel control system, all the battery packs are isolated by a plurality of relays, then the parallel system detects the voltage and the electric quantity of the battery packs, compares the current voltages of all the battery packs in pairs, closes the control relays to connect in parallel when the voltage is less than or equal to 0.3V, detects the current formed by the two in parallel, judges the parallel connection fault if the current is more than 5A, immediately disconnects the relays of the battery packs, and judges the other battery packs to be connected in parallel according to the same parameters.

The control management strategy of the logic control module in the invention is as follows:

1. firstly, an external supply system 12V auxiliary starting power supply is connected with a DC-DC plug;

2. after a 12V working power supply is arranged on the system, the battery pack and the parallel control system enter a self-checking flow as follows:

1) The battery pack self-checks the conditions of each string of voltage, all temperature data, electric quantity and the like of the battery, after the self-checking of the battery pack is finished, if no fault exists, closed discharge is carried out to output electricity to the front end position of a relay of a control board of the parallel system, if the self-checking of the battery pack has a fault, the closed discharge is not carried out, and fault information is sent to the parallel control system after communication is established;

2) The parallel system self-checks the charging and discharging state, the relay state, the charging and discharging line and the insulation state of the control panel;

the system communication is realized, the self-checking of the parallel system is free from fault, and then the request information of awakening and data receiving is sent to the battery pack, and the battery pack immediately awakens and replies the request data information after receiving the data request information;

the system is electrified, the system outputs the battery pack to a main board of a parallel control system for voltage collection after receiving the information of the voltage and the electric quantity of the battery pack, then the battery pack is connected in parallel according to the access mode of the parallel system, the system available power, the system pre-charging readiness and total positive relay closing request information are calculated according to the number of the battery packs connected in parallel after the parallel connection of the battery packs is completed, the system available power, the system pre-charging readiness and total positive relay closing request information are sent to a finished automobile CAN communication network and sent to a finished automobile VCU, the finished automobile sends out the operation permission power to a motor controller after receiving the battery system available power, the finished automobile replies a command of permitting the total positive relay to be closed after completing the preparation work items, when the parallel control system receives the total positive relay closeable information, the whole automobile is immediately electrified pre-charging to wait for the pre-charging voltage to reach 95%, and then the whole system is electrified.

The system comprises a battery parallel system, a battery monitoring system and a control system, wherein the battery parallel system monitors the number, voltage, current, temperature and communication of online battery packs in the running process and sets corresponding protection thresholds; the items monitored in the battery pack in operation comprise monomer voltage, temperature, electric quantity, current, pressure difference and temperature difference between monomers, and corresponding protection thresholds are set.

This well system intelligent management, system are when out of work as certain group battery trouble in the operation process, and parallel control system passes through voltage monitoring and judges the online quantity of group battery, also with the disconnection of online group battery control relay isolation not to in time send the group battery available power after the change to whole car system according to online group battery quantity, can not make the vehicle in the process of driving the condition of lying prone.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, it should be noted that, for those skilled in the art, many modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims (7)

1. A take driving system of parallel control which characterized in that: the device comprises a plurality of groups of independent battery packs (1), wherein each group of battery packs (1) is connected to the input end of a control device (2) in parallel, and the output end of the control device (2) is connected with the input end of a motor (3);

the control device (2) comprises a parallel control system mainboard (21), a logic control module (22), a plurality of charge-discharge relays (23) and a plurality of charge-discharge fuses (24) are arranged on the parallel control system mainboard (21), the output end of the battery pack (1) is connected with the input ends of the charge-discharge fuses (24), the output ends of the charge-discharge fuses (24) are connected with the input ends of the charge-discharge relays (23), the output end of each battery pack (1) is connected with the input end of the logic control module (22), the control end of the logic control module (22) is connected with the input end of each charge-discharge relay (23), the discharge end of each charge-discharge relay (23) is connected with the input end of a charge-discharge wire plug-in connector (27), the charge-discharge wire plug-in connector (27) is externally connected on the parallel control system mainboard (21), the output end of the charge-discharge wire plug-in connector (27) is connected with a motor (3), a DC-DC plug-in connector (25) is externally connected on the parallel control system mainboard (21) through a DC-DC plug-in fuse (26), and is used for providing an external power supply for the parallel control system mainboard (21).

2. The power system with parallel control according to claim 1, characterized in that: the battery pack (1) is at least provided with 3 groups, and the battery pack (1) is installed in the outer box (4) of the power system.

3. The power system with parallel control according to claim 1, characterized in that: the control device (2) is arranged in a parallel control system outer box (5), and the parallel control system outer box (5) is arranged on the outer side of the power system outer box (4).

4. The power system with parallel control according to claim 3, characterized in that: an outer cover (6) is arranged on the parallel control system outer box (5).

5. The power system with parallel control according to claim 2, characterized in that: an elastic clamping block (7) is arranged in the power system outer box (4).

6. The power system with parallel control according to claim 1, characterized in that: a CAN communication plug-in connector (28) is externally connected to the parallel control system main board (21), the input end of the CAN communication plug-in connector (28) is connected with the output end of the logic control module (22), and the CAN communication plug-in connector (28) is connected with the battery pack (1).

7. The power system with parallel control according to claim 1, characterized in that: the external power supply is 12V.

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