CN117996874A - Cell voltage equalization method, device, equipment, vehicle and storage medium - Google Patents

Cell voltage equalization method, device, equipment, vehicle and storage medium Download PDF

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Publication number
CN117996874A
CN117996874A CN202211335458.3A CN202211335458A CN117996874A CN 117996874 A CN117996874 A CN 117996874A CN 202211335458 A CN202211335458 A CN 202211335458A CN 117996874 A CN117996874 A CN 117996874A
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cell
battery
voltage
battery pack
cells
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王子妍
杨亚飞
朱有智
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Beijing CHJ Automobile Technology Co Ltd
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Beijing CHJ Automobile Technology Co Ltd
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Priority to CN202211335458.3A priority Critical patent/CN117996874A/en
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    • 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

The invention relates to the technical field of power batteries, and discloses a method, a device, equipment, a vehicle and a storage medium for balancing cell voltage. In some embodiments of the present disclosure, the open circuit voltage difference of each cell is calculated in real time according to the electrical performance parameter of the battery pack and the electrical performance parameter of each cell in the battery pack; determining the target number of the battery management system capable of performing voltage balancing operation according to the acquired current temperature of the main board of the battery management system; the target cells with the target number can be selected in real time based on the magnitude relation of the open-circuit voltage difference value of each cell; the method is not influenced by special working conditions such as charging and discharging, and the voltage balancing operation is started in real time on the target battery cell, so that the balancing capability of the balancing circuit is utilized to the maximum extent, the balancing utilization rate of the battery is improved, and the performance of the battery is improved.

Description

Cell voltage equalization method, device, equipment, vehicle and storage medium
Technical Field
The disclosure relates to the technical field of power batteries, and in particular relates to a method, a device, equipment, a vehicle and a storage medium for balancing voltage of an electric core.
Background
With the rapid development of new energy automobile technology, automobiles powered by lithium ion batteries have been developed.
The battery equalization is to use the power electronic technology to keep the voltage deviation of the lithium ion battery cell or the battery pack within the expected range, thereby ensuring that each battery cell keeps the same state during normal use so as to avoid the occurrence of overcharge and overdischarge.
At present, the battery balancing operation can not be started under the normal running or incompletely stationary state of the vehicle, so that the utilization rate of a balancing circuit of the battery is low, and the battery performance is influenced.
Disclosure of Invention
The disclosure provides a cell voltage equalization method, device, equipment, vehicle and storage medium. At least solves the technical problems of lower battery balance utilization rate and lower battery performance in the related technology.
The embodiment of the disclosure provides a cell voltage equalization method, which comprises the following steps:
determining an open-circuit voltage difference value of each cell according to the electrical performance parameters of the battery pack and the electrical performance parameters of each cell in the battery pack;
Determining the target number of battery cells which can perform voltage balancing operation by the battery management system according to the acquired current temperature of the main board of the battery management system;
Selecting the target cells with the target number from the cells according to the magnitude relation of the open-circuit voltage difference value of each cell;
and controlling the equalizing circuit to perform voltage equalizing operation on the target battery cell.
Optionally, the electrical performance parameters of the battery pack include: the battery pack residual capacity, the battery comprises residual capacity and battery pack internal resistance, and the electrical performance parameters of the battery core comprise: the residual capacity of the battery cell, the internal resistance of the battery cell and the current voltage of the battery cell; the determining the open circuit voltage difference value of each cell according to the electrical performance parameter of the battery pack and the electrical performance parameter of each cell in the battery pack comprises:
determining the residual electric quantity deviation of each electric core according to the residual electric quantity of the battery pack and the residual electric quantity of each electric core;
Determining the internal resistance deviation of each electric core according to the internal resistance of the battery pack and the internal resistance of each electric core;
Determining a first voltage difference of the cell voltage at the current moment of each cell relative to an average voltage according to the residual electric quantity deviation of each cell, the internal resistance deviation of each cell, the current voltage of each cell, the residual electric quantity of the battery pack and the internal resistance of the battery pack;
And determining an open-circuit voltage difference value of each cell according to the first voltage difference, the second voltage difference, the current voltage and the voltage of the last moment of each cell, wherein the second voltage difference is the voltage difference of the cell voltage of each cell at the last moment of each cell relative to the average voltage.
Optionally, the determining the open circuit voltage difference of each cell according to the first voltage difference, the second voltage difference, the current voltage and the voltage of the last moment of each cell includes:
And optimizing the open-circuit cell difference value of each cell by taking the deviation of the residual electric quantity and the minimum voltage deviation of each cell as targets according to the first voltage difference, the second voltage difference, the current voltage, the voltage at the last moment, the accumulated charge transfer quantity and the unit electric charge quantity of each cell, so as to obtain the open-circuit cell difference value of each cell.
Optionally, the determining, according to the collected current temperature of the motherboard of the battery management system, the target number of the battery cells capable of performing the voltage balancing operation by the battery management system includes:
And inquiring a mapping relation table of a temperature interval and the number of the battery cells according to the acquired current temperature of the mainboard of the battery management system to obtain the target number.
Optionally, the selecting the target number of target cells from the cells according to the magnitude relation of the open-circuit voltage difference value of each cell includes:
And selecting target cells which are arranged in the front N bits in sequence from the cells according to the sequence of the open circuit voltage difference values of the cells from large to small, wherein N is the numerical value of the target number.
Optionally, the performing voltage equalization operation on the target battery cell includes:
And controlling an equalization circuit to perform discharge operation on the target battery cell.
The embodiment of the disclosure also provides a cell voltage equalization device, which comprises:
the first determining module is used for determining an open circuit voltage difference value of each cell according to the electrical performance parameter of the battery pack and the electrical performance parameter of each cell in the battery pack;
The second determining module is used for determining the target number of the battery cells which can be subjected to voltage balancing operation by the battery management system according to the acquired current temperature of the main board of the battery management system;
the selection module is used for selecting the target cells with the target number from the cells according to the magnitude relation of the open-circuit voltage difference value of each cell;
And the control module is used for controlling the equalization circuit to perform voltage equalization operation on the target battery cell.
The embodiment of the disclosure also provides an electronic device, including: a memory and a processor;
the memory is used for storing a computer program;
the processor is configured to execute the computer program to implement the steps in the method as described above.
The disclosed embodiments also provide a vehicle including: the vehicle comprises a vehicle body and a battery management system, a memory and a processor which are arranged on the vehicle body;
The battery management system comprises a battery pack and a battery management system main board, wherein the battery pack comprises a battery core, and an equalization circuit is integrated on the battery management system main board;
the memory is used for storing a computer program;
the processor is configured to execute the computer program to implement the steps in the method as described above.
The disclosed embodiments also provide a computer readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of the above-described method.
The technical scheme provided by the embodiment of the disclosure at least brings the following beneficial effects:
In some embodiments of the present disclosure, the open circuit voltage difference of each cell is calculated in real time according to the electrical performance parameter of the battery pack and the electrical performance parameter of each cell in the battery pack; determining the target number of the battery management system capable of performing voltage balancing operation according to the acquired current temperature of the main board of the battery management system; the target cells with the target number can be selected in real time based on the magnitude relation of the open-circuit voltage difference value of each cell; the method is not influenced by special working conditions such as charging and discharging, and the voltage balancing operation is started in real time on the target battery cell, so that the balancing capability of the balancing circuit is utilized to the maximum extent, the balancing utilization rate of the battery is improved, and the performance of the battery is improved.
Drawings
Fig. 1 is a schematic flow chart of a method for balancing cell voltages according to an exemplary embodiment of the present disclosure;
Fig. 2 is a schematic flow chart of a method for balancing cell voltages according to an exemplary embodiment of the present disclosure;
Fig. 3 is a schematic structural diagram of a cell voltage balancing device according to an exemplary embodiment of the present disclosure;
Fig. 4 is a schematic structural diagram of an electronic device according to an exemplary embodiment of the present disclosure.
Detailed Description
In order that the above objects, features and advantages of the present disclosure may be more clearly understood, a further description of aspects of the present disclosure will be provided below. It should be noted that, without conflict, the embodiments of the present disclosure and features in the embodiments may be combined with each other.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure, but the present disclosure may be practiced otherwise than as described herein; it will be apparent that the embodiments in the specification are only some, but not all, embodiments of the disclosure.
It should be noted that the terms "first," "second," and the like in the description and claims of the present disclosure and in the foregoing figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the disclosure described herein may be capable of operation in sequences other than those illustrated or described herein. The implementations described in the following exemplary examples are not representative of all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with some aspects of the present disclosure as detailed in the accompanying claims.
It should be noted that, the user information related to the present disclosure includes, but is not limited to: user equipment information and user personal information; the processes of collecting, storing, using, processing, transmitting, providing, disclosing and the like of the user information in the present disclosure all conform to the regulations of the relevant laws and regulations and do not violate the well-known and popular public order.
With the rapid development of new energy automobile technology, automobiles powered by lithium ion batteries have been developed.
The battery equalization is to use the power electronic technology to keep the voltage deviation of the lithium ion battery cell or the battery pack within the expected range, thereby ensuring that each battery cell keeps the same state during normal use so as to avoid the occurrence of overcharge and overdischarge.
At present, the balance control of the lithium ion battery is based on the fact that large single cell voltage is collected under the working condition of sufficient standing or small current, and when the single cell voltage difference is large, the battery balance is started. The battery equalization operation can not be started under the normal running or incompletely stationary state of the vehicle, so that the utilization rate of an equalization circuit of the battery is low, and the battery performance is influenced.
Aiming at the technical problems, in some embodiments of the present disclosure, an open circuit voltage difference value of each cell is calculated in real time according to an electrical performance parameter of a battery pack and an electrical performance parameter of each cell in the battery pack; determining the target number of the battery management system capable of performing voltage balancing operation according to the acquired current temperature of the main board of the battery management system; the target cells with the target number can be selected in real time based on the magnitude relation of the open-circuit voltage difference value of each cell; the method is not influenced by special working conditions such as charging and discharging, and the voltage balancing operation is started in real time on the target battery cell, so that the balancing capability of the balancing circuit is utilized to the maximum extent, the balancing utilization rate of the battery is improved, and the performance of the battery is improved.
The following describes in detail the technical solutions provided by the embodiments of the present disclosure with reference to the accompanying drawings.
Fig. 1 is a schematic flow chart of a method for balancing cell voltages according to an exemplary embodiment of the present disclosure. As shown in fig. 1, the method includes:
S101: determining an open-circuit voltage difference value of each cell according to the electrical performance parameters of the battery pack and the electrical performance parameters of each cell in the battery pack;
s102: determining the target number of battery cells which can perform voltage balancing operation by the battery management system according to the acquired current temperature of the main board of the battery management system;
S103: selecting target cells with target number from the cells according to the magnitude relation of the open-circuit voltage difference value of each cell;
s104: and performing voltage equalization operation on the target battery cell.
In this embodiment, the execution subject of the above method may be a vehicle, or an electronic device powered by a battery. Such as unmanned aerial vehicles, cleaning robots, and unmanned vehicles.
When the execution body is a vehicle, the type of the vehicle is not limited, and the present disclosure does not limit the type of the vehicle, including but not limited to any one of the following: electric vehicles, oil-powered vehicles, hybrid electric vehicles, hydrogen-powered vehicles, hybrid electric vehicles with new energy and oil-powered, and the like.
It should be noted that the present disclosure is not limited to the type of battery. Types of batteries include, but are not limited to: lithium ion batteries, nickel hydrogen batteries, fuel cells, lead acid batteries, and sodium sulfur batteries.
It should be noted that the electrical performance parameters of the battery pack include, but are not limited to: the battery pack remaining capacity, the battery including the remaining capacity and the battery pack internal resistance. Electrical performance parameters of the cell include, but are not limited to: the residual capacity of the battery cell, the internal resistance of the battery cell and the current voltage of the battery cell.
In some embodiments of the present disclosure, a battery management system is integrated on a vehicle. The battery management system comprises a battery pack and a battery management system main board. Wherein, the battery pack comprises at least one electric core; and an equalization circuit is integrated on the mainboard of the battery management system.
In some embodiments of the present disclosure, the open circuit voltage differential for each cell is determined based on the electrical performance parameter of the battery pack and the electrical performance parameter of each cell in the battery pack. One implementation method is that the residual electric quantity deviation of each electric core is determined according to the residual electric quantity of the battery pack and the residual electric quantity of each electric core; determining the internal resistance deviation of each cell according to the internal resistance of the battery pack and the internal resistance of each cell; determining a first voltage difference of the cell voltage relative to the average voltage at the current moment of each cell according to the residual electric quantity deviation of each cell, the internal resistance deviation of each cell, the current voltage of each cell, the residual electric quantity of the battery pack and the internal resistance of the battery pack; and determining an open-circuit voltage difference value of each cell according to the first voltage difference, the second voltage difference, the current voltage and the voltage at the last moment of each cell, wherein the second voltage difference is the voltage difference of the cell voltage at the last moment of each cell relative to the average voltage.
In the above embodiment, the residual power deviation of each cell is determined according to the battery pack residual power and the cell residual power of each cell. Optionally, the difference between the remaining power of the battery pack and the remaining power of each cell is used as the remaining power deviation Δsoc of each cell.
In the above embodiment, the internal resistance deviation of each cell is determined according to the internal resistance of the battery pack and the internal resistance of each cell. Optionally, the difference between the internal resistance of the battery pack and the internal resistance of each cell is taken as the internal resistance deviation delta R of each cell.
In the above embodiment, the first voltage difference y of the cell voltage at the current time of each cell relative to the average voltage is determined according to the deviation of the remaining power of each cell, the deviation of the internal resistance of each cell, the current voltage of each cell, the remaining power of the battery pack, and the internal resistance of the battery pack. The calculation formula is as follows:
Wherein the state variables As the partial derivative of the current voltage of the battery cell to the remaining charge of the battery pack,Is the partial derivative of the current voltage of the battery cell to the internal resistance of the battery pack.
In the above embodiment, the open circuit voltage difference value of each cell is determined according to the first voltage difference, the second voltage difference, the current voltage and the voltage at the previous time of each cell. According to the first voltage difference, the second voltage difference, the current voltage, the voltage at the last moment, the accumulated charge transfer amount and the unit charge amount of each cell, the open-circuit cell difference value x k of each cell is obtained by optimizing the open-circuit cell difference value of each cell with the minimum residual charge deviation and voltage deviation of each cell as targets.
The state equation x k＝(Ak′ Ak)-1(Ak′ bk+Ak′ ck of the open-circuit cell difference value) optimizes the open-circuit cell difference value of each cell with the minimum residual electric quantity deviation and voltage deviation of each cell as targets to obtain an optimization equation x k＝minx(Akx-bk-ck)2 of the open-circuit cell difference value; wherein,
Wherein m is a positive integer, m is greater than k-1, Q is accumulated charge transfer quantity, C is unit charge quantity, y meas,k-1 is second differential pressure, y meas,k is first differential pressure, u bal,k is current voltage, and u bal,k-1 is voltage at the last moment.
In some embodiments of the present disclosure, a target number of cells that the battery management system is capable of performing voltage balancing operations is determined based on the collected current temperature of the battery management system motherboard. One implementation method is that according to the collected current temperature of the battery management system main board, a mapping relation table of a temperature interval and the number of battery cells is inquired to obtain the target number. And a mapping relation table is prepared in advance, wherein the mapping relation table stores the corresponding relation between the temperature interval of the main board of the battery management system and the number of the battery cells which can perform voltage balancing operation by the battery management system. Through set up temperature sensor around the battery management system mainboard, can acquire the temperature of battery management system mainboard in real time through temperature sensor, through the current temperature of battery management system mainboard, the decision can carry out the cell number of voltage balancing operation, can guarantee that the temperature of battery management system mainboard is in reasonable scope, furthest's promotion battery balanced utilization rate simultaneously, occupation computer resource minimum, promotion battery performance.
For example, a temperature sensor provided around the battery management system main board collects the current temperature of the battery management system main board to 170 degrees. The temperature interval to which 170 degrees are queried is [170, 180], and the number of battery cells corresponding to the temperature interval [170, 180] in the query mapping relation is 8, and the target number is 8.
In some embodiments of the present disclosure, a target number of target cells is selected from the cells according to a magnitude relationship of the open circuit voltage difference for each cell. One way to achieve this is to select the target cells from the cells in the order of the open circuit voltage difference from the cell from the higher to the lower, where N is the number of the target cells in the order of the first N bits. It should be noted that, in the embodiment of the present application, the preset bit sequence is not limited, and the preset bit sequence is set corresponding to the target number, and the preset bit sequence may be adjusted according to the actual situation, for example, the preset bit sequence is the first 5 bits. According to the method, the target battery cells with larger open-circuit voltage difference values are selected from the battery cells to be subjected to equalization treatment preferentially, so that the equalization of the voltages of the battery cells in the battery is ensured, and the performance of the battery is improved.
In the above embodiment, the open circuit voltage differences of the cells may be sorted in order from the large to the small by the bubbling algorithm.
For example, the cells are queued in order of the open circuit voltage difference of the cells from large to small, cell three: 20 v, cell five: 15 v, cell one: 5V, cell two: 3 volts and cell four: 2 volts. And if the target number is 3, selecting the first three cells, the first five cells and the first cell from the five cells as target cells.
In some embodiments of the present disclosure, the voltage balancing operation is performed on the target cell. One way to achieve this is to control the equalization circuit to discharge the target cell. And controlling the equalization circuit to activate the target battery cell to a discharge state, or controlling the equalization circuit to increase the current discharge capacity of the target battery cell so as to enable each battery cell of the battery to reach the equalization state rapidly, and improving the working performance of the battery.
Based on the descriptions of the above embodiments, fig. 2 is a schematic flow chart of a cell voltage balancing method according to an exemplary embodiment of the disclosure. As shown in fig. 2, the cell voltage balancing method includes:
S201: determining an open circuit voltage difference value of each cell according to the remaining capacity of the battery pack, the internal resistance of the battery pack, the remaining capacity of each cell, the internal resistance of each cell and the current voltage of each cell;
S202: inquiring a mapping relation table of a temperature interval of the battery management system mainboard and the number of battery cells capable of performing voltage balancing operation according to the acquired current temperature of the battery management system mainboard to obtain a target number;
S203: selecting target cells of the target number which are arranged in a preset bit sequence from the cells according to the sequence of the open-circuit voltage difference values of the cells from large to small;
S204: and controlling the equalization circuit to perform discharge operation on the target battery cell.
In this embodiment, the execution subject of the above method may be a vehicle, or an electronic device powered by a battery. Such as unmanned aerial vehicles, cleaning robots, and unmanned vehicles.
When the execution body is a vehicle, the type of the vehicle is not limited, and the present disclosure does not limit the type of the vehicle, including but not limited to any one of the following: electric vehicles, oil-powered vehicles, hybrid electric vehicles, hydrogen-powered vehicles, hybrid electric vehicles with new energy and oil-powered, and the like.
It should be noted that the present disclosure is not limited to the type of battery. Types of batteries include, but are not limited to: lithium ion batteries, nickel hydrogen batteries, fuel cells, lead acid batteries, and sodium sulfur batteries.
The implementation manner of each step in this embodiment may refer to the descriptions of the foregoing embodiments, which are not repeated in this embodiment.
In the embodiment of the method disclosed by the invention, the open circuit voltage difference value of each cell is calculated in real time according to the residual capacity of the battery pack, the internal resistance of the battery pack, the residual capacity of each cell, the internal resistance of each cell and the current voltage of each cell, and is not influenced by special vehicle working conditions such as charging and discharging; determining the target number of the battery management system capable of performing voltage balancing operation according to the acquired current temperature of the main board of the battery management system; and selecting target cells with target number for voltage balancing operation, maximizing the balancing capacity of the balancing circuit, improving the balancing utilization rate of the battery and improving the performance of the battery.
Fig. 3 is a schematic structural diagram of a cell voltage balancing device 30 according to an exemplary embodiment of the present disclosure. As shown in fig. 3, the cell voltage equalizing device 30 includes: a first determination module 31, a second determination module 32, a selection module 33 and a control module 34.
The first determining module 31 is configured to determine an open circuit voltage difference value of each cell according to an electrical performance parameter of the battery pack and an electrical performance parameter of each cell in the battery pack;
The second determining module 32 is configured to determine, according to the collected current temperature of the motherboard of the battery management system, a target number of battery cells that can perform voltage balancing operation by the battery management system;
the selection module 33 is configured to select a target number of target cells from the cells according to a magnitude relation of the open-circuit voltage difference value of each cell;
the control module 34 is used for controlling the equalization circuit to perform voltage equalization operation on the target battery cell.
Optionally, the electrical performance parameters of the battery pack include: the battery pack residual capacity, the battery comprises residual capacity and battery pack internal resistance, and the electrical performance parameters of the battery core comprise: the residual capacity of the battery cell, the internal resistance of the battery cell and the current voltage of the battery cell; the first determining module 31 is configured to, when determining an open circuit voltage difference value of each cell according to the electrical performance parameter of the battery pack and the electrical performance parameter of each cell in the battery pack:
Determining the residual electric quantity deviation of each electric core according to the residual electric quantity of the battery pack and the residual electric quantity of each electric core;
determining the internal resistance deviation of each cell according to the internal resistance of the battery pack and the internal resistance of each cell;
Determining a first voltage difference of the cell voltage relative to the average voltage at the current moment of each cell according to the residual electric quantity deviation of each cell, the internal resistance deviation of each cell, the current voltage of each cell, the residual electric quantity of the battery pack and the internal resistance of the battery pack;
and determining an open-circuit voltage difference value of each cell according to the first voltage difference, the second voltage difference, the current voltage and the voltage at the last moment of each cell, wherein the second voltage difference is the voltage difference of the cell voltage at the last moment of each cell relative to the average voltage.
Optionally, the first determining module 31 is configured to, when determining the open circuit voltage difference value of each cell according to the first voltage difference, the second voltage difference, the current voltage, and the voltage at the previous time of each cell:
And optimizing the open-circuit cell difference value of each cell by taking the residual electric quantity deviation and the voltage deviation of each cell as targets to obtain the open-circuit cell difference value of each cell according to the first voltage difference, the second voltage difference, the current voltage, the voltage at the last moment, the accumulated electric charge transfer quantity and the unit electric charge quantity of each cell.
Optionally, when determining, according to the collected current temperature of the motherboard of the battery management system, the first determining module 31 is configured to:
and inquiring a mapping relation table of the temperature interval and the number of the battery cells according to the acquired current temperature of the mainboard of the battery management system to obtain the target number.
Optionally, the selecting module 33 is configured to, when selecting a target number of target cells from the cells according to the magnitude relation of the open-circuit voltage difference of each cell:
And selecting target cells which are ranked in the front N bits from the cells according to the sequence of the open circuit voltage difference values of the cells from large to small, wherein N is the numerical value of the target number.
Optionally, the control module 34 is configured to, when controlling the equalizing circuit to perform a voltage equalizing operation on the target cell:
and controlling the equalization circuit to perform discharge operation on the target battery cell.
The specific manner in which the various modules perform the operations in the apparatus of the above embodiments have been described in detail in connection with the embodiments of the method, and will not be described in detail herein.
Fig. 4 is a schematic structural diagram of an electronic device according to an exemplary embodiment of the present disclosure. As shown in fig. 4, the electronic device includes: a memory 41 and a processor 42. In addition, the electronic device further comprises a power supply component 43, a communication component 44.
The memory 41 is used for storing a computer program and may be configured to store other various data to support operations on the electronic device. Examples of such data include instructions for any application or method operating on an electronic device.
The memory 41 may be implemented by any type of volatile or non-volatile memory device or combination thereof, such as Static Random Access Memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic or optical disk.
A communication component 44 for data transmission with other devices.
The processor 42, executable computer instructions stored in the memory 41, is applied to a battery management system, the battery management system includes a battery pack and a battery management system motherboard, the battery pack includes a battery cell, and an equalization circuit is integrated on the battery management system motherboard for: determining an open-circuit voltage difference value of each cell according to the electrical performance parameters of the battery pack and the electrical performance parameters of each cell in the battery pack; determining the target number of battery cells which can perform voltage balancing operation by the battery management system according to the acquired current temperature of the main board of the battery management system; selecting target cells with target number from the cells according to the magnitude relation of the open-circuit voltage difference value of each cell; and controlling the equalization circuit to perform voltage equalization operation on the target battery cell.
Optionally, the electrical performance parameters of the battery pack include: the battery pack residual capacity, the battery comprises residual capacity and battery pack internal resistance, and the electrical performance parameters of the battery core comprise: the residual capacity of the battery cell, the internal resistance of the battery cell and the current voltage of the battery cell; the processor 42 is configured to, when determining the open circuit voltage difference for each cell based on the electrical performance parameter of the battery pack and the electrical performance parameter of each cell in the battery pack:
Determining the residual electric quantity deviation of each electric core according to the residual electric quantity of the battery pack and the residual electric quantity of each electric core;
determining the internal resistance deviation of each cell according to the internal resistance of the battery pack and the internal resistance of each cell;
Determining a first voltage difference of the cell voltage relative to the average voltage at the current moment of each cell according to the residual electric quantity deviation of each cell, the internal resistance deviation of each cell, the current voltage of each cell, the residual electric quantity of the battery pack and the internal resistance of the battery pack;
and determining an open-circuit voltage difference value of each cell according to the first voltage difference, the second voltage difference, the current voltage and the voltage at the last moment of each cell, wherein the second voltage difference is the voltage difference of the cell voltage at the last moment of each cell relative to the average voltage.
Optionally, the processor 42 is configured to, when determining the open circuit voltage difference value of each cell according to the first voltage difference, the second voltage difference, the current voltage and the voltage at the previous time of each cell:
And optimizing the open-circuit cell difference value of each cell by taking the residual electric quantity deviation and the voltage deviation of each cell as targets to obtain the open-circuit cell difference value of each cell according to the first voltage difference, the second voltage difference, the current voltage, the voltage at the last moment, the accumulated electric charge transfer quantity and the unit electric charge quantity of each cell.
Optionally, the processor 42 is configured to, when determining the target number of the battery cells capable of performing the voltage balancing operation according to the collected current temperature of the motherboard of the battery management system:
and inquiring a mapping relation table of the temperature interval and the number of the battery cells according to the acquired current temperature of the mainboard of the battery management system to obtain the target number.
Optionally, the processor 42 is configured to, when selecting a target number of target cells from the cells according to the magnitude relation of the open-circuit voltage difference of each cell:
And selecting target cells which are ranked in the front N bits from the cells according to the sequence of the open circuit voltage difference values of the cells from large to small, wherein N is the numerical value of the target number.
Optionally, the processor 42 is configured to, when performing a voltage equalization operation on the target cell:
and controlling the equalization circuit to perform discharge operation on the target battery cell.
Accordingly, the disclosed embodiments also provide a computer-readable storage medium storing a computer program. The computer-readable storage medium stores a computer program that, when executed by one or more processors, causes the one or more processors to perform the steps in the method embodiment of fig. 1.
Accordingly, the disclosed embodiments also provide a computer program product comprising a computer program/instructions for executing the steps of the method embodiment of fig. 1 by a processor.
In the embodiments of the apparatus, device, storage medium and computer program product of the present disclosure, the open circuit voltage difference value of each cell is calculated in real time according to the remaining battery power, the internal resistance of the battery pack, the remaining battery power of each cell, the internal resistance of each cell and the current voltage of each cell, without being affected by the special vehicle conditions such as charging and discharging; determining the target number of the battery management system capable of performing voltage balancing operation according to the acquired current temperature of the main board of the battery management system; and selecting target cells with target number for voltage balancing operation, maximizing the balancing capacity of the balancing circuit, improving the balancing utilization rate of the battery and improving the performance of the battery.
It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
In one typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.
The memory may include volatile memory in a computer-readable medium, random Access Memory (RAM) and/or nonvolatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM). Memory is an example of computer-readable media.
Computer readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of storage media for a computer include, but are not limited to, phase change memory (PRAM), static Random Access Memory (SRAM), dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), read Only Memory (ROM), electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium, which can be used to store information that can be accessed by a computing device. Computer-readable media, as defined herein, does not include transitory computer-readable media (transmission media), such as modulated data signals and carrier waves.
It should be noted that in this document, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises an element.
The above is merely a specific embodiment of the disclosure to enable one skilled in the art to understand or practice the disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A method for cell voltage equalization, the method comprising:
determining an open-circuit voltage difference value of each cell according to the electrical performance parameters of the battery pack and the electrical performance parameters of each cell in the battery pack;
Determining the target number of battery cells which can perform voltage balancing operation by the battery management system according to the acquired current temperature of the main board of the battery management system;
Selecting the target cells with the target number from the cells according to the magnitude relation of the open-circuit voltage difference value of each cell;
And performing voltage equalization operation on the target battery cell.
2. The method of claim 1, wherein the electrical performance parameters of the battery pack comprise: the battery pack residual capacity, the battery comprises residual capacity and battery pack internal resistance, and the electrical performance parameters of the battery core comprise: the residual capacity of the battery cell, the internal resistance of the battery cell and the current voltage of the battery cell; the determining the open circuit voltage difference value of each cell according to the electrical performance parameter of the battery pack and the electrical performance parameter of each cell in the battery pack comprises:
determining the residual electric quantity deviation of each electric core according to the residual electric quantity of the battery pack and the residual electric quantity of each electric core;
Determining the internal resistance deviation of each electric core according to the internal resistance of the battery pack and the internal resistance of each electric core;
Determining a first voltage difference of the cell voltage at the current moment of each cell relative to an average voltage according to the residual electric quantity deviation of each cell, the internal resistance deviation of each cell, the current voltage of each cell, the residual electric quantity of the battery pack and the internal resistance of the battery pack;
And determining an open-circuit voltage difference value of each cell according to the first voltage difference, the second voltage difference, the current voltage and the voltage of the last moment of each cell, wherein the second voltage difference is the voltage difference of the cell voltage of each cell at the last moment of each cell relative to the average voltage.
3. The method of claim 2, wherein said determining an open circuit voltage differential for each of said cells based on said first voltage differential, said second voltage differential, a current voltage, and a previous time voltage for each of said cells comprises:
And optimizing the open-circuit cell difference value of each cell by taking the deviation of the residual electric quantity and the minimum voltage deviation of each cell as targets according to the first voltage difference, the second voltage difference, the current voltage, the voltage at the last moment, the accumulated charge transfer quantity and the unit electric charge quantity of each cell, so as to obtain the open-circuit cell difference value of each cell.
4. The method of claim 1, wherein determining the target number of cells that the battery management system can perform the voltage balancing operation according to the collected current temperature of the motherboard of the battery management system comprises:
And inquiring a mapping relation table of a temperature interval and the number of the battery cells according to the acquired current temperature of the mainboard of the battery management system to obtain the target number.
5. The method of claim 1, wherein selecting the target number of target cells from the cells according to the magnitude relation of the open circuit voltage difference of each cell comprises:
And selecting target cells which are arranged in the front N bits in sequence from the cells according to the sequence of the open circuit voltage difference values of the cells from large to small, wherein N is the numerical value of the target number.
6. The method of claim 1, wherein said performing a voltage equalization operation on said target cell comprises:
And controlling an equalization circuit to perform discharge operation on the target battery cell.
7. A cell voltage equalization apparatus, characterized in that the cell voltage equalization apparatus comprises:
the first determining module is used for determining an open circuit voltage difference value of each cell according to the electrical performance parameter of the battery pack and the electrical performance parameter of each cell in the battery pack;
The second determining module is used for determining the target number of the battery cells which can be subjected to voltage balancing operation by the battery management system according to the acquired current temperature of the main board of the battery management system;
the selection module is used for selecting the target cells with the target number from the cells according to the magnitude relation of the open-circuit voltage difference value of each cell;
And the control module is used for controlling the equalization circuit to perform voltage equalization operation on the target battery cell.
8. An electronic device, comprising: a memory and a processor;
the memory is used for storing a computer program;
The processor for executing the computer program to carry out the steps of the method according to any one of claims 1 to 6.
9. A vehicle, characterized by comprising: the vehicle comprises a vehicle body and a battery management system, a memory and a processor which are arranged on the vehicle body;
The battery management system comprises a battery pack and a battery management system main board, wherein the battery pack comprises a battery core, and an equalization circuit is integrated on the battery management system main board;
the memory is used for storing a computer program;
The processor for executing the computer program to carry out the steps of the method according to any one of claims 1 to 6.
10. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the method of any of claims 1-6.
CN202211335458.3A 2022-10-28 2022-10-28 Cell voltage equalization method, device, equipment, vehicle and storage medium Pending CN117996874A (en)

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