CN115498726A - Active equalization circuit, vehicle and method for power battery - Google Patents

Active equalization circuit, vehicle and method for power battery Download PDF

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Publication number
CN115498726A
CN115498726A CN202211159028.0A CN202211159028A CN115498726A CN 115498726 A CN115498726 A CN 115498726A CN 202211159028 A CN202211159028 A CN 202211159028A CN 115498726 A CN115498726 A CN 115498726A
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CN
China
Prior art keywords
battery
battery cell
cell
charged
assembly
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Pending
Application number
CN202211159028.0A
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Chinese (zh)
Inventor
邓丰
肖利华
李祥
童斌
伊炳希
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Chongqing Changan New Energy Automobile Technology Co Ltd
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Chongqing Changan New Energy Automobile Technology Co Ltd
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Priority to CN202211159028.0A priority Critical patent/CN115498726A/en
Publication of CN115498726A publication Critical patent/CN115498726A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
    • H02J7/0014—Circuits for equalisation of charge between batteries
    • H02J7/0019—Circuits for equalisation of charge between batteries using switched or multiplexed charge circuits
    • 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
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/00304—Overcurrent protection
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits

Abstract

The application relates to an active equalization circuit, a vehicle and a method for a power battery, wherein the circuit comprises: the acquisition assembly is used for acquiring the voltage of each battery cell in the vehicle battery; the switch assembly has a plurality of switch states, and each switch state corresponds to the charge-discharge state of a battery cell in the power battery and the charge-discharge state of a battery cell in the vehicle battery; the control assembly is used for screening out a first to-be-charged battery cell meeting a first charging condition and a first discharging condition according to the voltage of each battery cell in the power battery, screening out a second to-be-charged battery cell meeting a second charging condition and a second to-be-discharged condition according to the voltage of each battery cell in the vehicle battery, and controlling the switch assembly to charge the first to-be-charged battery cell through the second to-be-discharged battery cell and/or charge the second to-be-charged battery cell through the first to-be-discharged battery cell. Therefore, mutual charging and discharging between any single body of the power battery and any single body of the 12V storage battery can be realized, and the purpose of active equalization of the power battery is further achieved.

Description

Active equalization circuit, vehicle and method for power battery
Technical Field
The application relates to the technical field of batteries, in particular to an active equalization circuit, a vehicle and a method for a power battery.
Background
The power battery is a power supply for providing a power source for the new energy vehicle. The battery system group is formed by connecting a plurality of batteries in series, and each battery cannot be identical. Without the use of equalization, the voltage difference between the weakest battery and the strongest battery will increase during each charge-discharge cycle. Eventually, one of the cells will always be close to the maximum voltage, while the other cell is close to the minimum voltage. During charging, when the first battery cell is fully charged, the battery must stop charging, which results in that other battery cells which are not fully charged cannot continue to be charged; on the other hand, at the time of discharge, when the first cell is dead, the discharge must be terminated, which results in the cells that still have charge not being able to discharge.
In this way, the charging and discharging capability of the entire battery pack is hindered, and the battery life is also affected. In order to ensure that the available capacity of each single battery reaches 100%, increase the available capacity of the battery, and delay the capacity difference caused by self or aging, an electronic technology is required to be utilized to keep the voltage deviation of the battery single battery within an expected range, so that the whole availability and controllability are realized, and each single battery is ensured not to be damaged in normal use, and the service life of each single battery is prolonged.
There are two main equalizing methods in the related art: passive equalization and active equalization. Passive equalization is generally realized by means of resistor discharge, and active equalization is superior to passive equalization in energy utilization and equalization efficiency
However, passive equalization cannot increase the capacity of the low-residue battery, and the equalization charge is 100% wasted in the form of heat; active equalization the active equalization technology at present is not yet mature.
Disclosure of Invention
The application provides a power battery's initiative equalizer circuit, vehicle and method to it is unbalanced to have solved the battery and has used, leads to the charge-discharge ability of whole group battery to receive the hindrance, and the battery life also can receive the problem of influence, has realized that arbitrary monomer of power battery and arbitrary monomer of 12V storage battery can charge each other and discharge between, and then has reached the purpose of power battery initiative equilibrium.
An embodiment of a first aspect of the present application provides an active equalization circuit for a power battery, including: the acquisition assembly is used for acquiring the voltage of each battery cell in the vehicle battery; the switch assembly is provided with a plurality of switch states, and each switch state corresponds to the charge-discharge state of a battery cell in the power battery and the charge-discharge state of the battery cell in the vehicle battery; and the control assembly is used for screening out a first to-be-charged battery cell meeting a first charging condition and a first to-be-discharged battery cell meeting the first discharging condition according to the voltage of each battery cell in the power battery, screening out a second to-be-charged battery cell meeting a second charging condition and a second to-be-discharged battery cell meeting the second discharging condition according to the voltage of each battery cell in the vehicle battery, and controlling the switch assembly to be in a corresponding switch state so as to pass through the second to-be-discharged battery cell as the first to-be-charged battery cell for charging, and/or pass through the first to-be-discharged battery cell as the second to-be-charged battery cell for charging.
According to the technical means, the problem that the charging and discharging capacity of the whole battery pack is hindered due to unbalanced battery use and the service life of the battery is influenced is solved, the mutual charging and discharging between any single power battery and any single 12V storage battery can be realized, and the purpose of active equalization of the power battery is further achieved.
Optionally, in some embodiments, the switch assembly includes: each switch in the first multi-way selection switch array is arranged corresponding to each electric core in the power battery; and each switch in the second multi-way selection switch array is arranged corresponding to each battery cell in the vehicle battery.
According to the technical means, the switch component can control the conduction and the closing of the charging circuit and the discharging circuit.
Optionally, in some embodiments, the switch assembly, the control assembly, comprises: the acquisition unit is used for acquiring the voltage of each battery cell in the vehicle battery acquired by the acquisition assembly; the acquisition unit is used for acquiring the voltage of each battery cell in the power battery; the first screening unit is used for screening out a first to-be-charged battery cell meeting a first charging condition and a first to-be-discharged battery cell meeting a first discharging condition according to the voltage of each battery cell in the power battery; the second screening unit is used for screening out a second to-be-charged battery cell meeting a second charging condition and a second to-be-discharged battery cell meeting a second discharging condition according to the voltage of each battery cell in the vehicle battery; the first control unit is configured to control a switch corresponding to the first to-be-charged cell in the first multi-way selection switch array to be in a closed state, and control a switch corresponding to the second to-be-discharged cell in the second multi-way selection switch array to be in a closed state, so that the first to-be-charged cell is charged by the second to-be-discharged cell; and the second control unit is used for controlling the switch corresponding to the first to-be-discharged battery cell in the first multi-path selection switch array to be in a closed state and controlling the switch corresponding to the second to-be-charged battery cell in the second multi-path selection switch array to be in a closed state, so that the first to-be-discharged battery cell is used for charging the second to-be-charged battery cell.
According to the technical means, the power battery can be charged and discharged between any single body of the power battery and any single body of the 12V storage battery, and further the purpose of active balance of the power battery is achieved.
Optionally, in some embodiments, the active balancing circuit for a power battery further includes: the charging assembly is used for being connected into a first to-be-charged battery cell meeting a first charging condition in the power battery and a second to-be-discharged battery cell meeting a second discharging condition in the vehicle battery; and the discharging assembly is used for being connected to a first to-be-discharged battery cell meeting a first discharging condition in the power battery and a second to-be-charged battery cell meeting a second charging condition in the vehicle battery.
According to the technical means, the charging and discharging component can execute the charging and discharging instruction output by the controller, and the purpose of active equalization of the power battery is achieved.
Optionally, in some embodiments, the active balancing circuit for a power battery further includes: a first connection assembly for connecting the power cell and the first multi-way selector switch array; the second connecting assembly is used for connecting the vehicle battery and the second multi-way selection switch array; a third connection assembly for connecting the control assembly and a battery management system.
According to the technical means, the battery and the switch are connected through the connecting component, and the purpose of active balance of the power battery is achieved.
Optionally, in some embodiments, the active balancing circuit of the power battery further includes: and the voltage conversion assembly is connected with the vehicle storage battery through the second connecting assembly so as to convert the voltage of the vehicle storage battery into a target voltage and then supply power to the control assembly and the acquisition assembly.
According to the technical means, the voltage conversion component can convert the required voltage, and the safety of the circuit is protected.
Optionally, in some embodiments, the active balancing circuit of the power battery further includes: the first multi-way selection switch array and the second multi-way selection switch array are both composed of a plurality of relays.
According to the technical means, the output instruction of the control group component can be executed through the multi-way selection switch, and the on and off of the circuit are controlled.
Optionally, in some embodiments, the method further comprises: the first current-limiting resistor is arranged between the discharge assembly and the second multi-way selection switch array; and the second current limiting resistor is arranged between the discharge assembly and the first multi-path selection switch array.
According to the technical means, the current-limiting resistor protection circuit can prevent the circuit from being damaged due to overlarge or unstable current.
An embodiment of a second aspect of the present application provides a vehicle, comprising: such as the active equalization circuit of the power battery.
An embodiment of the third aspect of the present application provides an active balancing method for a power battery, where the active balancing circuit for a power battery is adopted, the method includes the following steps: collecting the voltage of each battery cell in the vehicle battery and the voltage of each battery cell in the power battery; screening out a first to-be-charged battery cell meeting a first charging condition and a first to-be-discharged battery cell meeting a first discharging condition according to the voltage of each battery cell in the power battery, and screening out a second to-be-charged battery cell meeting a second charging condition and a second to-be-discharged battery cell meeting a second discharging condition according to the voltage of each battery cell in the vehicle battery; and controlling the switch assembly to be in a corresponding switch state so as to charge the first to-be-charged battery cell through the second to-be-discharged battery cell and/or charge the second to-be-charged battery cell through the first to-be-discharged battery cell.
Therefore, the voltage of each battery cell in the vehicle battery is collected through the collection assembly; the switch assembly has a plurality of switch states, and each switch state corresponds to the charge-discharge state of a battery cell in the power battery and the charge-discharge state of a battery cell in the vehicle battery; and the control assembly is used for screening a first to-be-charged cell meeting a first charging condition and a first to-be-discharged cell meeting the first discharging condition according to the voltage of each cell in the power battery, screening a second to-be-charged cell meeting a second charging condition and a second to-be-discharged cell meeting the second discharging condition according to the voltage of each cell in the vehicle battery, and controlling the switch assembly to be in a corresponding switch state so as to charge the first to-be-charged cell through the second to-be-discharged cell and/or charge the second to-be-charged cell through the first to-be-discharged cell. Therefore, the problems that the battery is unbalanced in use, the charging and discharging capacity of the whole battery pack is hindered, the service life of the battery is influenced are solved, the mutual charging and discharging between any single power battery and any single 12V storage battery can be realized, and the purpose of active equalization of the power battery is further achieved.
Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.
Drawings
The above and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a block diagram illustrating an active equalization circuit of a power battery according to an embodiment of the present disclosure;
fig. 2 is a schematic diagram of an active balancing circuit for a power battery according to an embodiment of the present application;
FIG. 3 is a schematic view of a charging assembly provided in accordance with an embodiment of the present application;
FIG. 4 is a block diagram of a multiplexer array according to one embodiment of the present application;
fig. 5 is a schematic diagram of an active balancing method for a power battery according to an embodiment of the present application.
Description of reference numerals: 10-active equalization circuit of power battery, 100-acquisition component, 200-switch component, 300-control component, U3-discharge component, U4-charging component, U5-voltage conversion component, J1-first connection component, J2-second connection component, J3-third connection component, S1-first multiplexing group array and S2-second multiplexing group array.
Detailed Description
Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present application and should not be construed as limiting the present application.
The active equalization circuit, the vehicle, and the method of the power battery according to the embodiments of the present application are described below with reference to the drawings. In order to solve the problems that the charging and discharging capacity of the whole battery pack is hindered and the service life of the battery is influenced due to unbalanced battery use mentioned in the background art, the application provides an active equalization circuit of a power battery, wherein the voltage of each battery cell in a vehicle battery is acquired through an acquisition assembly; the switch assembly has a plurality of switch states, and each switch state corresponds to the charge-discharge state of a battery cell in the power battery and the charge-discharge state of a battery cell in a vehicle battery; and the control assembly is used for screening a first battery cell to be charged meeting a first charging condition and a first battery cell to be discharged meeting the first discharging condition according to the voltage of each battery cell in the power battery, screening a second battery cell to be charged meeting a second charging condition and a second battery cell to be discharged meeting the second discharging condition according to the voltage of each battery cell in the vehicle battery, and controlling the switch assembly to be in a corresponding switch state so as to charge the first battery cell to be charged through the second battery cell to be discharged and/or charge the second battery cell to be charged through the first battery cell to be discharged. Therefore, the problems that the battery is unbalanced in use, the charging and discharging capacity of the whole battery pack is hindered, the service life of the battery is influenced are solved, the mutual charging and discharging between any single power battery and any single 12V storage battery can be realized, and the purpose of active equalization of the power battery is further achieved.
Specifically, fig. 1 is a block schematic diagram of an active equalization circuit of a power battery according to an embodiment of the present application.
As shown in fig. 1, the active equalization circuit 10 of the power battery includes: collection assembly 100, switch assembly 200, and control assembly 300.
The acquisition assembly 100 is used for acquiring the voltage of each battery cell in a vehicle battery; the switch assembly 200 has multiple switch states, each switch state corresponds to a charge-discharge state of an electric core in the power battery and a charge-discharge state of an electric core in the vehicle battery, the control assembly 300 is used for screening out a first to-be-charged electric core meeting a first charge condition and a first to-be-discharged electric core meeting the first discharge condition according to the voltage of each electric core in the power battery, screening out a second to-be-charged electric core meeting a second charge condition and a second to-be-discharged electric core meeting the second discharge condition according to the voltage of each electric core in the vehicle battery, and controlling the switch assembly 200 to be in the corresponding switch state so as to charge the first to-be-charged electric core through the second to-be-discharged electric core and/or charge the second to-be-charged electric core through the first to-be-discharged electric core.
The collecting component 100 may be an AFE chip, and is configured to collect a voltage value of each electric core of a 12V battery (i.e., a vehicle battery), and send data to the control component 300 through an SPI (Serial Peripheral interface), where the control component 300 may be an MCU.
It should be noted that, in the embodiment of the present application, the electric core that needs to be charged and discharged is screened out through detecting the electric core voltage of the power battery and the electric core voltage of the 12V storage battery at the same time, and the electric core that needs to be charged and discharged is matched through the control switch assembly 200 to be charged and discharged, so that the mutual charging and discharging between any single body of the power battery and any single body of the 12V storage battery are realized, and further, the purpose of the active equalization of the power battery is achieved.
Optionally, in some embodiments, as shown in fig. 2, the active balancing circuit 10 of the power battery further includes: the battery charging system comprises a charging assembly U4 and a discharging assembly U3, wherein the charging assembly U4 is used for being connected into a first battery cell to be charged meeting a first charging condition in a power battery and a second battery cell to be discharged meeting a second discharging condition in a vehicle battery; the discharging assembly U3 is used for being connected to a first to-be-discharged battery cell meeting a first discharging condition in the power battery and a second to-be-charged battery cell meeting a second charging condition in the vehicle battery.
Specifically, the circuit diagrams of the charging assembly U4 and the discharging assembly U3 may be as shown in fig. 3, and the discharging assembly U3 may include an MOS (Metal-Oxide-Semiconductor, semiconductor Metal Oxide) tube driver chip, an MOS tube, a transformer, and a rectifier circuit, and may convert a voltage of an electric core that needs to be discharged in any one power battery into 5V, and charge the electric core that needs to be charged in any 12V battery; the charging assembly U4 can comprise an MOS tube driving chip, an MOS tube, a transformer and a rectifying circuit, can convert the voltage of a battery cell needing to be discharged in any 12V storage battery into 5V, and charges the battery cell needing to be charged in any power battery.
Optionally, in some embodiments, the switch assembly 200, comprises: the vehicle battery system comprises a first multi-way selection switch array S1 and a second multi-way selection switch array S2, wherein each way of switch in the first multi-way selection switch array S1 corresponds to each electric core in the power battery, and each way of switch in the second multi-way selection switch array S2 corresponds to each electric core in the vehicle battery.
Optionally, in some embodiments, the active balancing circuit 10 of the power battery further includes: the first multi-way selection switch array S1 and the second multi-way selection switch array S2 are both composed of a plurality of relays.
As shown in fig. 4, the first multi-way selector switch array S1 may be composed of a plurality of relays, and is configured to implement that any one of the battery cells of the power battery is connected to the input end of the discharging module U3 or the output end of the charging module U4 under the control of the MCU; the second multi-path selection switch array S2 can also be composed of a plurality of relays, and is configured to implement cell matching of the 12V battery, and under the control of the control assembly 300, implement connection of any one cell in the 12V battery to the output terminal of the discharge module U3 or the input terminal of the charge module U4.
Optionally, in some embodiments, the control assembly 300, comprises: the system comprises an acquisition unit, a collection unit, a first screening unit, a second screening unit, a first control unit and a second control unit, wherein the acquisition unit is used for acquiring the voltage of each battery cell in the vehicle battery acquired by the collection assembly 100; the acquisition unit is used for acquiring the voltage of each battery cell in the power battery, and the first screening unit is used for screening out a first to-be-charged battery cell meeting a first charging condition and a first to-be-discharged battery cell meeting a first discharging condition according to the voltage of each battery cell in the power battery; the second screening unit is used for screening out a second to-be-charged battery cell meeting a second charging condition and a second to-be-discharged battery cell meeting a second discharging condition according to the voltage of each battery cell in the vehicle battery; the first control unit is configured to control a switch corresponding to the first to-be-charged battery cell in the first multi-way selection switch array S1 to be in a closed state, and control a switch corresponding to the second to-be-discharged battery cell in the second multi-way selection switch array S2 to be in a closed state, so as to charge the first to-be-charged battery cell through the second to-be-discharged battery cell; the second control unit is configured to control the switch in the first multi-path selection switch array S1 corresponding to the first to-be-discharged battery cell to be in a closed state, and control the switch in the second multi-path selection switch array S2 corresponding to the second to-be-charged battery cell to be in a closed state, so that the first to-be-discharged battery cell is used for charging the second to-be-charged battery cell.
The control component 300 may be an MCU, and reads a voltage value of each electric core of the power Battery in a BMS (Battery Management System) System through a CAN (controller area network) communication, and reads a voltage value of each electric core of the 12V Battery on the AFE chip through an SPI communication, and controls to match any monomer of the power Battery and any monomer of the 12V Battery to be accessed to an input end or an output end of the discharging module U3 or the charging module U4 by controlling the first and second multi-way selection switch arrays S1 and S2.
Optionally, in some embodiments, the active balancing circuit 10 of the power battery further includes: the multi-way switch comprises a first connecting assembly J1, a second connecting assembly J2 and a third connecting assembly J3, wherein the first connecting assembly J1 is used for connecting a power battery and a first multi-way selector switch array S1; the second connecting assembly J2 is used for connecting a vehicle battery and a second multi-way selection switch array S2; the third connecting member J3 is used to connect the control member 300 and the battery management system.
Specifically, as shown in fig. 2, the first connection assembly J1 may implement connection between a circuit and each battery cell in the power battery; the second connecting assembly J2 CAN realize the CAN communication connection of the MCU and the BMS system, and the third connecting assembly J3 CAN realize the connection of each electric core in the circuit and the 12V storage battery.
Optionally, in some embodiments, the active balancing circuit 10 of the power battery further includes: and the voltage conversion component U5 is connected with the vehicle storage battery through a second connecting component J2, so that the voltage of the vehicle storage battery is converted into a target voltage and then is supplied to the control component 300 and the acquisition component 100.
Specifically, the voltage conversion component U5 may be a level conversion chip that converts 12V to 5V for powering the MCU and AFE chips.
Optionally, in some embodiments, the active balancing circuit 10 of the power battery further includes: the first current limiting resistor is arranged between the discharge component U3 and the second multi-path selection switch array S2; the second current limiting resistor is disposed between the discharging component U3 and the first multi-way selection switch array S1.
Specifically, in order to protect the circuit, in the embodiment of the present application, a current limiting resistor may be disposed between the discharge component U3 and the multiple selection switch array, so as to prevent the circuit element from being burned out.
In order to enable those skilled in the art to further understand the active equalization circuit of the power battery according to the embodiment of the present application, the following detailed description is provided with reference to specific embodiments.
As shown in fig. 2, fig. 2 is a schematic diagram of an active equalization circuit of a power battery according to an embodiment of the present disclosure.
In the discharging process, the control component 300 selects the electric core needing to be discharged in the power battery, selects the electric core needing to be charged in the 12V storage battery, and outputs a control signal, controls the first multi-path selection switch array S1, switches on the electric core needing to be discharged in the power battery to be connected to the access end of the discharging module U3, controls the second multi-path selection switch array to switch on the electric core needing to be charged in the 12V storage battery to be connected to the output end of the discharging module U3, starts to discharge, and switches off the switch after the control component 300 judges that the discharging is completed, and finishes the discharging.
In the charging process, the control assembly 300 screens out the electric core needing to be charged in the power battery and the electric core needing to be discharged in the 12V storage battery, outputs a control signal, controls the first multi-path group selection switch array S1, switches on the electric core needing to be charged in the power battery to be connected to the input end of the charging module U4, starts charging, and disconnects the switch after the control assembly 300 judges that charging is completed, and finishes charging.
Therefore, the embodiment of the application is based on the BMS system, the multi-way selection switch and the two groups of 5V flyback DC-DC circuits are controlled through the MCU, the mutual charging and discharging between any single power battery and any single 12V storage battery can be realized, and the purpose of active equalization of the power battery is achieved.
According to the active equalization circuit of the power battery, the voltage of each battery cell in the battery jar of the vehicle is collected through the collection assembly; the switch assembly has a plurality of switch states, and each switch state corresponds to the charge-discharge state of a battery cell in the power battery and the charge-discharge state of a battery cell in the vehicle battery; and the control assembly is used for screening a first to-be-charged cell meeting a first charging condition and a first to-be-discharged cell meeting the first discharging condition according to the voltage of each cell in the power battery, screening a second to-be-charged cell meeting a second charging condition and a second to-be-discharged cell meeting the second discharging condition according to the voltage of each cell in the vehicle battery, and controlling the switch assembly to be in a corresponding switch state so as to charge the first to-be-charged cell through the second to-be-discharged cell and/or charge the second to-be-charged cell through the first to-be-discharged cell. Therefore, the problems that the battery is unbalanced in use, the charging and discharging capacity of the whole battery pack is hindered, the service life of the battery is influenced are solved, the mutual charging and discharging between any single power battery and any single 12V storage battery can be realized, and the purpose of active equalization of the power battery is further achieved.
An embodiment of the present application further provides a vehicle, including: such as the active equalization circuit of the power battery.
According to the vehicle provided by the embodiment of the application, the voltage of each battery cell in a vehicle battery is acquired through the acquisition assembly by the active equalization circuit of the power battery; the switch assembly has a plurality of switch states, and each switch state corresponds to the charge-discharge state of a battery cell in the power battery and the charge-discharge state of a battery cell in a vehicle battery; and the control assembly is used for screening a first battery cell to be charged meeting a first charging condition and a first battery cell to be discharged meeting the first discharging condition according to the voltage of each battery cell in the power battery, screening a second battery cell to be charged meeting a second charging condition and a second battery cell to be discharged meeting the second discharging condition according to the voltage of each battery cell in the vehicle battery, and controlling the switch assembly to be in a corresponding switch state so as to charge the first battery cell to be charged through the second battery cell to be discharged and/or charge the second battery cell to be charged through the first battery cell to be discharged. Therefore, the problems that the battery is unbalanced in use, the charging and discharging capacity of the whole battery pack is hindered, the service life of the battery is influenced are solved, the mutual charging and discharging between any single power battery and any single 12V storage battery can be realized, and the purpose of active equalization of the power battery is further achieved.
As shown in fig. 5, an embodiment of the present application further provides an active equalization method for a power battery, where the active equalization circuit for a power battery is adopted, and the method includes the following steps:
in step S501, the voltage of each battery cell in the vehicle battery and the voltage of each battery cell in the power battery are collected.
In step S502, a first to-be-charged cell satisfying a first charging condition and a first to-be-discharged cell satisfying a first discharging condition are selected according to a voltage of each cell in the power battery, and a second to-be-charged cell satisfying a second charging condition and a second to-be-discharged cell satisfying a second discharging condition are selected according to a voltage of each cell in the vehicle battery.
In step S503, the switch assembly is controlled to be in a corresponding switch state, so as to charge the first to-be-charged battery cell through the second to-be-discharged battery cell and/or charge the second to-be-charged battery cell through the first to-be-discharged battery cell.
According to the active equalization method for the power battery, provided by the embodiment of the application, by collecting the voltage of each battery cell in the vehicle battery and the voltage of each battery cell in the power battery, a first to-be-charged battery cell meeting a first charging condition and a first to-be-discharged battery cell meeting a first discharging condition are screened out according to the voltage of each battery cell in the power battery, a second to-be-charged battery cell meeting a second charging condition and a second to-be-discharged battery cell meeting the second discharging condition are screened out according to the voltage of each battery cell in the vehicle battery, and the switch assembly is controlled to be in a corresponding switch state, so that the second to-be-discharged battery cell is used for charging the first to-be-charged battery cell, and/or the first to-be-discharged battery cell is used for charging the second to-be-charged battery cell. Therefore, the problems that the battery is unbalanced in use, the charging and discharging capacity of the whole battery pack is hindered, the service life of the battery is influenced are solved, the mutual charging and discharging between any single power battery and any single 12V storage battery can be realized, and the purpose of active equalization of the power battery is further achieved.
In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or N embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
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 implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "N" means at least two, e.g., two, three, etc., unless explicitly defined otherwise.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more N executable instructions for implementing steps of a custom logic function or process, and alternate implementations are included within the scope of the preferred embodiment of the present application in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the embodiments of the present application.
It should be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the N steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are well known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a programmable gate array, a field programmable gate array, or the like.
It will be understood by those skilled in the art that all or part of the steps carried out in the method of implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and the program, when executed, includes one or a combination of the steps of the method embodiments.
While embodiments of the present application have been shown and described above, it will be understood that the above embodiments are exemplary and should not be construed as limiting the present application and that changes, modifications, substitutions and alterations in the above embodiments may be made by those of ordinary skill in the art within the scope of the present application.

Claims (10)

1. An active equalization circuit for a power cell, comprising:
the acquisition assembly is used for acquiring the voltage of each battery cell in the vehicle battery;
the switch assembly is provided with a plurality of switch states, and each switch state corresponds to the charge-discharge state of a battery cell in the power battery and the charge-discharge state of the battery cell in the vehicle battery; and
the control assembly is used for screening out a first battery cell to be charged meeting a first charging condition and a first battery cell to be discharged meeting the first discharging condition according to the voltage of each battery cell in the power battery, screening out a second battery cell to be charged meeting a second charging condition and a second battery cell to be discharged meeting the second discharging condition according to the voltage of each battery cell in the vehicle battery, and controlling the switch assembly to be in a corresponding switch state so as to pass through the second battery cell to be discharged as the first battery cell to be charged and/or pass through the first battery cell to be discharged as the second battery cell to be charged.
2. The active balancing circuit for power batteries according to claim 1, wherein the switch assembly comprises:
each switch in the first multi-way selection switch array is arranged corresponding to each electric core in the power battery;
and each switch in the second multi-way selection switch array is arranged corresponding to each electric core in the vehicle storage battery.
3. The active balancing circuit for power batteries according to claim 2, characterized in that the control assembly comprises:
the acquisition unit is used for acquiring the voltage of each battery cell in the vehicle battery acquired by the acquisition assembly;
the acquisition unit is used for acquiring the voltage of each battery cell in the power battery;
the first screening unit is used for screening out a first to-be-charged battery cell meeting a first charging condition and a first to-be-discharged battery cell meeting a first discharging condition according to the voltage of each battery cell in the power battery;
the second screening unit is used for screening out a second to-be-charged battery cell meeting a second charging condition and a second to-be-discharged battery cell meeting a second discharging condition according to the voltage of each battery cell in the vehicle battery;
the first control unit is configured to control a switch corresponding to the first to-be-charged cell in the first multi-way selection switch array to be in a closed state, and control a switch corresponding to the second to-be-discharged cell in the second multi-way selection switch array to be in a closed state, so that the first to-be-charged cell is charged by the second to-be-discharged cell;
the second control unit is configured to control a switch corresponding to the first to-be-discharged cell in the first multi-way selection switch array to be in a closed state, and control a switch corresponding to the second to-be-charged cell in the second multi-way selection switch array to be in a closed state, so that the second to-be-charged cell is charged through the first to-be-discharged cell.
4. The active balancing circuit for power batteries according to claim 3, further comprising:
the charging assembly is used for being connected to a first to-be-charged battery cell meeting a first charging condition in the power battery and a second to-be-discharged battery cell meeting a second discharging condition in the vehicle battery;
and the discharging assembly is used for connecting a first to-be-discharged battery cell meeting a first discharging condition in the power battery and a second to-be-charged battery cell meeting a second charging condition in the vehicle battery.
5. The active balancing circuit for power batteries according to claim 3 or 4, characterized in that it further comprises:
the first connecting assembly is used for connecting the power battery and the first multi-way selection switch array;
the second connecting assembly is used for connecting the vehicle battery and the second multi-way selection switch array;
a third connection assembly for connecting the control assembly and a battery management system.
6. The active balancing circuit for power batteries according to claim 5, further comprising:
and the voltage conversion assembly is connected with the vehicle storage battery through the second connecting assembly so as to convert the voltage of the vehicle storage battery into a target voltage and then supply power to the control assembly and the acquisition assembly.
7. The active equalization circuit of a power battery according to claim 2 or 3, wherein the first multiplexing switch array and the second multiplexing switch array are both composed of a plurality of relays.
8. The active balancing circuit for power batteries according to claim 7, further comprising:
the first current limiting resistor is arranged between the discharge assembly and the second multi-path selection switch array;
and the second current limiting resistor is arranged between the discharge assembly and the first multi-path selection switch array.
9. A vehicle, characterized by comprising: active balancing circuit for a power cell according to any of the claims 1-8.
10. An active equalization method for a power battery, characterized in that the active equalization circuit for a power battery according to any one of claims 1-8 is adopted, and the method comprises the following steps:
collecting the voltage of each battery cell in the vehicle battery and the voltage of each battery cell in the power battery;
screening out a first to-be-charged battery cell meeting a first charging condition and a first to-be-discharged battery cell meeting a first discharging condition according to the voltage of each battery cell in the power battery, and screening out a second to-be-charged battery cell meeting a second charging condition and a second to-be-discharged battery cell meeting a second discharging condition according to the voltage of each battery cell in the vehicle battery; and
and controlling the switch assembly to be in a corresponding switch state so as to charge the first to-be-charged battery cell through the second to-be-discharged battery cell and/or charge the second to-be-charged battery cell through the first to-be-discharged battery cell.
CN202211159028.0A 2022-09-22 2022-09-22 Active equalization circuit, vehicle and method for power battery Pending CN115498726A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202211159028.0A CN115498726A (en) 2022-09-22 2022-09-22 Active equalization circuit, vehicle and method for power battery

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202211159028.0A CN115498726A (en) 2022-09-22 2022-09-22 Active equalization circuit, vehicle and method for power battery

Publications (1)

Publication Number Publication Date
CN115498726A true CN115498726A (en) 2022-12-20

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Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Status (1)

Country Link
CN (1) CN115498726A (en)

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