WO2019042416A1

WO2019042416A1 - Battery equalization method and system, vehicle, and electronic device

Info

Publication number: WO2019042416A1
Application number: PCT/CN2018/103537
Authority: WO
Inventors: 罗红斌; 王超; 沈晓峰; 曾求勇; 刘苑红; 张祥
Original assignee: 比亚迪股份有限公司
Priority date: 2017-08-31
Filing date: 2018-08-31
Publication date: 2019-03-07
Also published as: CN110015175B; CN110015175A

Abstract

A battery equalization method, comprising: obtaining target parameter information of a cell to be equalized in a battery pack (11) (S21); obtaining historical equalization duration and historical parameter information of the cell to be equalized, the historical parameter information being historical information of the target parameter information (S22); determining target equalization duration required for this equalization of the cell to be equalized according to the target parameter information, the historical equalization duration, and the historical parameter information (S23); and controlling the equalization of the cell to be equalized according to the target equalization duration (S24). Also disclosed are a battery equalization system using the method, a vehicle comprising the battery equalization system, and an electronic device comprising a computer readable medium storing the method. The battery equalization method can be employed to conveniently and quickly obtain the target equalization duration of a cell to be equalized, and is straightforward and efficient.

Description

Battery equalization method, system, vehicle and electronic device

Cross-reference to related applications

The present application is based on a Chinese patent application filed on Jan. 31, 2017, the entire disclosure of which is hereby incorporated by reference.

Technical field

The present application relates to the field of battery management technologies, and in particular, to a battery equalization method, system, vehicle, and electronic device.

Background technique

Power battery packs are an important part of electric vehicles. With the use of the power battery pack, the difference between the individual cells in the power battery pack is gradually enlarged, resulting in poor consistency between the individual cells. Due to the "short board effect" of the power battery pack, the capacity of the power battery pack is limited, resulting in a decrease in the overall capacity of the power battery pack. Therefore, it is necessary to effectively balance the management of the single cells in the power battery pack, so that the capacity of each unit battery is kept consistent, so as to reduce the capacity loss of the power battery pack, prolong the service life of each unit battery and continue the electric vehicle. Driving mileage.

In the related art, the equalization time required for the unit cells to be equalized is generally determined according to the difference in capacity of each unit battery in the power battery pack, and the equalization unit is equalized according to the equalization period. However, battery capacity is a variable that characterizes the internal characteristics of the battery. Its size is difficult to measure. Its accurate measurement method needs to be measured in a laboratory for discharge experiments.

Summary of the invention

The purpose of the present application is to provide a battery equalization method, system, vehicle, and electronic device to quickly and efficiently obtain the equalization time required for a single cell to be balanced, and optimize the battery equalization process.

According to a first aspect of the embodiments of the present application, a battery equalization method includes: acquiring target parameter information of a battery to be equalized in a battery pack; acquiring historical equalization duration and historical parameter information of the to-equalized single battery, The historical parameter information is the historical information of the target parameter information; and the target equalization time required for the current equalization of the to-be-equalized unit cells is determined according to the target parameter information, the historical equalization duration, and the historical parameter information. And controlling the equalization of the cells to be equalized according to the target equalization duration.

Optionally, the target parameter information includes: a difference value of the target parameter; and the step of acquiring the target parameter information of the unit battery to be equalized includes: acquiring target parameters of each single battery in the power battery group, The target parameter includes any one of the following parameters: voltage, SOC, internal resistance, self-discharge rate, voltage change rate, power change rate, and time change rate; according to the target parameters of the respective single cells, Determining a reference value of the target parameter; obtaining a difference value of the target parameter according to the target parameter of the unit cell to be equalized and the reference value.

Optionally, the target parameter information further includes: an available capacity of the battery to be equalized; the step of acquiring target parameter information of the battery to be equalized includes: acquiring battery information of the battery to be equalized, the battery The information includes at least: a voltage value, a current value, and a temperature value; and the available capacity of the battery to be equalized is obtained according to the battery information of the battery to be equalized.

Optionally, the determining, according to the target parameter information, the historical equalization duration, and the historical parameter information, the step of determining a target equalization duration of the to-be-equalized unit battery includes:

The target equalization duration is determined using the following formula:

Where t _k is the target equalization duration; t _k-1 is the historical equalization duration of the last equalization of the to-be-equalized unit cells; ΔS _k is the current time, the target parameters of the unit cells to be equalized and the The difference between the reference values of the target parameters; ΔS _k-1 is the difference between the target parameter of the cell to be equalized and the reference value of the target parameter; C _k is the current time The current available capacity of the unit battery to be equalized; C _k-1 is the last equalization time, and the historical available capacity of the unit battery to be equalized.

Optionally, the method further includes determining, according to a target parameter of each single battery in the battery group, the to-equalize unit battery, wherein the target parameter includes: voltage, SOC At least one of internal resistance, self-discharge rate, voltage change rate, power change rate, and time change rate.

According to a second aspect of the embodiments of the present application, a battery equalization system includes: an equalization module, an acquisition module, and a control module; and the acquisition module is configured to collect each of the power battery groups under the control of the control module. The battery module information of the single battery; the control module is configured to obtain target parameter information of the battery to be equalized in the battery group according to the battery information of each of the single cells collected by the collecting module; and obtain the to-be-balanced single The historical equalization time and the historical parameter information of the body battery, wherein the historical parameter information is historical information of the target parameter information; determining the to-be-balanced according to the target parameter information, the historical equalization duration, and the historical parameter information The target equalization time required for the current cell balancing; controlling the equalization of the cells to be equalized according to the target equalization time; the equalization module is configured to correspond to the control module under the control The cells are balanced.

Optionally, the target parameter information includes: a difference value of the target parameter; the control module is configured to acquire a target parameter of each single battery in the power battery group, where the target parameter includes the following parameters Any one of: voltage, SOC, internal resistance, self-discharge rate, voltage change rate, power change rate, and time change rate; determining a reference value of the target parameter according to the target parameter of each of the single cells; The target parameter of the unit cell is equalized with the reference value, and the difference of the target parameter is obtained.

Optionally, the target parameter information further includes: an available capacity of the battery to be equalized; the control module is configured to acquire battery information of the battery to be equalized, and the battery information includes at least: a voltage value and a current value. And a temperature value; obtaining the available capacity of the battery to be equalized according to the battery information of the battery to be equalized.

Optionally, the control module is configured to determine the target equalization duration by using the following formula:

Where t _k is the target equalization duration; t _k-1 is the historical equalization duration of the last equalization of the to-be-equalized unit cells; ΔS _k is the current time, the target parameters of the unit cells to be equalized and the The difference between the reference values of the target parameters; ΔS _k-1 is the difference between the target parameter of the cell to be equalized and the reference value of the target parameter; C _k is the current time, The current available capacity of the unit battery to be equalized; C _k-1 is the last equalization time, and the historical available capacity of the unit battery to be equalized.

Optionally, the control module is further configured to determine, according to a target parameter of each unit battery in the battery group, the unit to be equalized from the battery group, wherein the target parameter comprises: a voltage At least one of SOC, internal resistance, self-discharge rate, voltage change rate, power change rate, and time change rate.

Optionally, the control module is connected to the acquisition module and the equalization module corresponding to the same single cell through a channel, and the acquisition module and the equalization module time-multiplex the channels.

Optionally, the control module includes a control chip, and the control chip is connected to an acquisition module and an equalization module corresponding to the same single cell through a pin, and the pin passes through the channel and the equalization module and the The acquisition module is connected.

Optionally, the control module is respectively connected to the acquisition module and the equalization module corresponding to the same single cell through two channels.

Optionally, the control module includes a control chip, and the control chip is respectively connected to an acquisition module and an equalization module corresponding to the same single cell through two pins, and the two pins are connected to the two channels. Correspondingly, one of the two pins is connected to the equalization module through one of the two channels, and the other of the two pins passes through the two channels Another channel is connected to the acquisition module.

According to a third aspect of the embodiments of the present application, there is provided a vehicle comprising the battery equalization system provided by the second aspect of the embodiments of the present application.

According to a fourth aspect of the embodiments of the present application, there is provided a computer readable storage medium having stored thereon computer program instructions, the program instructions being executed by a processor, the battery equalization method provided by the first aspect of the embodiments of the present application.

According to a fifth aspect of the embodiments of the present application, there is provided an electronic device comprising: the computer readable storage medium provided by the fourth aspect of the embodiments of the present application; and one or more processors for executing the computer readable A program in a storage medium.

According to the foregoing technical solution, the target equalization time required for the current equalization of the cells to be equalized is determined according to the obtained target parameter information, the historical equalization duration, and the historical parameter information of the unit cell to be equalized, so that the balance to be balanced can be conveniently and quickly obtained. This method is directly effective when the target cell balance time is long.

Other features and advantages of the present application will be described in detail in the detailed description which follows.

DRAWINGS

The accompanying drawings are included to provide a further understanding of the invention, In the drawing:

FIG. 1 is a structural block diagram of a battery equalization system according to an exemplary embodiment;

2 is a flow chart showing a battery equalization method according to an exemplary embodiment;

FIG. 3 is a flowchart of a method for acquiring target parameter information according to an exemplary embodiment;

4 is a flow chart of a battery equalization method illustrated in accordance with an exemplary real time;

FIG. 5 is a flowchart of a battery equalization method according to another exemplary embodiment;

FIG. 6 is a block diagram of a battery equalization system, according to an exemplary embodiment;

FIG. 7 is a block diagram of a battery equalization system, according to another exemplary illustration.

Detailed ways

The specific embodiments of the present application are described in detail below with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are intended to be illustrative and not restrictive.

It should be noted that the terms "first", "second" and the like in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or order.

FIG. 1 is a structural block diagram of a battery equalization system according to an exemplary embodiment. As shown in FIG. 1 , the battery equalization system 10 includes a battery pack 11 , an acquisition module 12 , an equalization module 13 , and a control module 14 .

The battery pack 11 includes a plurality of unit cells connected in series.

The collecting module 12 collects the battery information of each single battery in the battery pack 11 and sends the collected battery information of each single battery to the control module 14. The battery information of each unit battery may include, for example, but not limited to, information such as voltage, current, temperature, and the like of each unit battery.

The control module 14 determines, according to the battery information of each unit battery, whether there is a cell to be equalized that needs to be equalized in the battery pack 11, and after determining the cell to be equalized, outputs corresponding information according to the battery information of the cell to be equalized. The control signal is sent to the equalization module 13, and the control equalization module 13 performs equalization processing on the equalized cells.

FIG. 2 is a flow chart showing a battery equalization method according to an exemplary embodiment. As shown in FIG. 2, the battery equalization method includes the following steps:

In step S21, target parameter information of the unit cells to be equalized in the battery pack is acquired.

In one embodiment, the target parameter information includes a difference value of the target parameters. As shown in FIG. 3, the above step S21 may include the following steps:

In step S211, target parameter information of the unit cell to be equalized is obtained, wherein the target parameter includes any one of the following parameters: voltage, SOC, internal resistance, self-discharge rate, voltage change rate, power change rate, and time change. rate.

In the embodiment of the present application, the self-discharge rate of the single cell refers to the ability of the stored battery to maintain the power under certain conditions in an open state (ie, stop charging or stop discharging). The self-discharge rate of a single cell is an important parameter for characterizing the characteristics of a single cell, and can effectively characterize the capacity loss and capacity loss rate of a single cell.

The voltage change rate of the single cell refers to the voltage change rate of the single cell during charging (or discharging), that is, the voltage change rate of the single cell can be the voltage change when the specified physical quantity of the single cell changes. . For example, in the present application, a predetermined amount of electric power is injected or discharged to a single battery, and a voltage variation amount dv/dq of the single battery; or a preset length of charging or discharging the single battery, a voltage variation amount of the single battery dv /dt is an example for explanation.

The rate of change in the amount of electricity of the unit cell may be the amount of change in voltage when the unit of the specified physical quantity of the unit cell changes. For example, in the present application, the amount of electric power required to increase the voltage of the unit cell by one unit voltage from the initial voltage, or the amount of decrease in the voltage of the unit cell from the initial voltage by one unit voltage will be described as an example.

The time rate of change of the unit cells may be the length of time required for the unit of the specified physical quantity of the unit cells to change. For example, in the present application, the charging time required for the voltage of the unit cell to rise by one unit voltage from the initial voltage or the discharge time required for the voltage of the unit cell to decrease by one unit voltage from the initial voltage will be described as an example.

During the charging or discharging of the battery pack, the target parameters of each of the single cells may be determined according to the collected battery information of each of the single cells. The battery information of each unit battery may include, for example, but not limited to, information such as voltage, current, temperature, and the like of each unit battery.

In step S212, a reference value of the target parameter is determined according to the target parameter of each of the individual cells.

In one embodiment, the target parameter of any of the battery cells in the battery pack can be used as a reference value for the target parameter.

In another embodiment, the target parameter may also be calculated based on target parameters of each of the individual cells in the battery pack. For example, the reference value of the target parameter is the minimum value, the maximum value, the average value, or the median value of the target parameters of the individual cells in the battery pack, and the like.

In step S213, the difference between the target parameters is obtained according to the target parameter of the unit cell to be equalized and the reference value.

In one embodiment, the difference between the target parameter of the unit cell to be equalized and the reference value may be used as the difference of the target parameter.

For example, taking the target parameter as the SOC value, the SOC value of each unit battery can be obtained according to the battery information of each unit battery collected at the current time, and the minimum SOC value SOC _{min is} used as a reference value. Thereby, the difference ΔSOC _k between the SOC value of the cell to be balanced at the current time and the reference value can be obtained.

In another embodiment, the target parameter further includes: an available capacity of the unit battery to be equalized. The available capacity of the cell to be balanced can be determined according to the battery information of the cell to be balanced.

In step S22, the historical equalization duration and historical parameter information of the unit cells to be equalized are obtained, wherein the historical parameter information is historical information of the target parameter information.

In each process of equalizing the battery pack, the equalization time and target parameters of the equalized cells to be balanced are recorded, and the average time and target parameters of each cell are compared with each equalization. Storage, thereby obtaining the historical equalization duration and historical parameter information of the equalized cell to be equalized.

It should be noted that the historical equalization duration may be the equalization period of the equalization of the cell to be balanced. Correspondingly, the historical parameter information may include target parameter information of the last equalization time of the to-be-equalized unit battery, for example, the difference between the target parameters including the equalization time of the single-cell equalization cell, and the single cell to be equalized last time. The available capacity at equilibrium time.

In addition, the historical equalization duration may also be an average value of the equalization duration of the equalization of the cells to be balanced each time before the current equalization. Correspondingly, the historical parameter may also include an average value of the target parameter differences of the to-equalized cells at each equalization time before the current equalization, and an average of the available capacities of the cells to be equalized at each equilibrium time before the equalization. Values and the like, this application does not limit this.

In step S23, the target equalization time required for the current equalization of the cells to be equalized is determined according to the target parameter information, the historical equalization duration, and the historical parameter information.

In one embodiment, the target equalization duration can be determined by the following formula (1).

Where t _k is the target equalization time required for the current equalization of the cell to be equalized; t _{k-1 is} the historical equilibrium time of the last equalization of the cell to be equalized; ΔS _k is the current time, the monomer to be equalized The difference between the target parameter of the battery and the reference value of the target parameter; ΔS _k-1 is the difference between the target parameter of the cell to be equalized and the reference value of the target parameter; C _k For the current time, the current available capacity of the unit battery to be balanced; C _k-1 is the last equalization time, the historical available capacity of the unit battery to be equalized.

In step S24, the equalization of the cells to be equalized is controlled according to the target equalization time.

After determining the target equalization time required for the equalization of the cell to be equalized, the equalization cell can be equalized according to the target equalization time. According to different ways of obtaining the reference value of the target parameter, the equalization process of the equalized single cell can be performed in different ways.

Next, different equalization processing methods will be described separately.

Method 1: Passive equilibrium.

If the minimum value of the target parameter of each unit cell is used as the reference value of the target parameter, the equalization battery may be equalized by passive equalization, that is, the cell to be equalized is discharged, for example, set and balanced in the equalization module. The parallel resistance of the single cells reduces the difference between the target parameters of the cells to be equalized and the reference value to a preset range, and achieves the effect of equalizing the individual cells in the battery pack.

Method 2: Active balancing.

If the maximum value of the target parameter of each single cell is used as the reference value of the target parameter, the equalization process of the equalized cell may be performed by an active equalization method, that is, the battery to be equalized is charged, for example, a power supply component is set in the equalization module. (such as a generator or a battery), the difference between the target parameter of the unit cell to be equalized and the reference value is reduced to a preset range, and the effect of equalizing each unit cell in the battery pack is achieved.

Method 3: The combination of active and passive equalization.

If the average value or the median of the target parameters of each unit cell is used as the reference value of the target parameter, the unit cell whose target parameter is smaller than the reference value may be subjected to equalization processing in an active equalization manner, and the target parameter is greater than the reference value. The single cell is balanced by a passive equalization method, so that the difference between the target parameter and the reference value of the cell to be balanced is reduced to a preset range, and the effect of equalizing each cell in the battery pack is achieved.

Next, taking the target parameter information of the unit cell to be equalized, including the difference in SOC value of the unit cell to be equalized and the current available capacity, as an example, the entire equalization process of the unit cell to be equalized will be described.

As shown in FIG. 4, at the beginning, the acquisition module detects and records battery information such as voltage, current, temperature, and the like of each unit battery; the control module determines the SOC value of each unit battery according to the battery information, and obtains the SOC value of each unit battery. The minimum SOC value (reference value of the target parameter); then, the control module determines the difference ΔSOC _k (the difference between the target parameters) of the SOC value of each unit cell of the current equalization and the minimum SOC value, and reads the unit to be equalized The current available capacity C _{k of the} battery, the historical available capacity C _k-1 of the last equalization time, the historical equalization time t _k-1 of the last equalization time, and the historical SOC difference ΔSOC _k-1 of the last equalization time, and according to t _k equalization length information to determine when this equilibrium to be required for equalization target cell. After the control module calculates the target equalization duration, the equalization of the cells to be equalized can be controlled according to the target equalization duration.

FIG. 5 is a flow chart showing a battery equalization method according to an exemplary embodiment. As shown in FIG. 5, the battery equalization method includes the following steps:

In step S51, the unit cells to be equalized are determined from the battery group according to the target parameters of the individual cells in the battery pack, wherein the target parameters include: voltage, SOC, internal resistance, self-discharge rate, voltage change rate, and power amount. At least one of a rate of change and a rate of change in time.

During the charging or discharging of the battery pack, the collecting module can detect and record the battery information of each single battery in the battery pack and send it to the control module, wherein the battery information can include, for example but not limited to: each single battery Voltage, current, temperature and other information.

The control module can determine the target parameters of each unit battery according to the battery information of each unit battery, and determine the unit cells to be equalized in the battery group according to the target parameters of each unit battery.

Next, the process of determining the cells to be equalized in the battery pack will be described by taking the target parameter including the SOC as an example.

The control module can obtain the SOC value of each single battery according to the battery information of each unit battery sent by the collection module, and obtain the minimum SOC value in each unit battery, thereby obtaining the SOC value and the minimum SOC value of each unit battery. The difference is compared and the resulting difference is compared to the minimum SOC value to determine the cells to be equalized in the battery pack. For example, if the difference between the SOC value and the minimum SOC value of the single battery is greater than or equal to the preset SOC difference threshold, it is determined that the single battery is a single battery to be equalized; if the SOC value of the single battery is the smallest If the difference between the SOC values is less than the preset SOC difference threshold, it is determined that the single cell does not need to be equalized.

In addition, the cell to be equalized may be determined by at least one of a voltage, an internal resistance, a self-discharge rate, a voltage change rate, a power change rate, and a time change rate of each of the single cells, and details are not described herein again.

In step S52, target parameter information of the unit cells to be equalized in the battery pack is acquired.

In step S53, the historical equalization duration and the historical parameter information of the unit cell to be equalized are obtained, wherein the historical parameter information is historical information of the target parameter information.

In step S54, the target equalization time required for the current equalization of the cells to be equalized is determined according to the target parameter information, the historical equalization duration, and the historical parameter information.

In step S55, the equalization of the cells to be equalized is controlled according to the target equalization duration.

After determining the cell to be equalized, determining the target equalization time according to the target parameter information, the historical equalization time, and the historical parameter information of the cell to be equalized, and performing equalization processing on the equalized cell according to the target equalization time, has been applied in the present application. The above embodiments are described in detail, and are not described herein again.

FIG. 6 is a block diagram of a battery equalization system, according to an exemplary embodiment, and FIG. 7 is a block diagram of a battery equalization system according to another exemplary illustration. As shown in FIG. 6 and FIG. 7, the battery equalization system 60 includes a battery pack 61, an acquisition module 62, an equalization module 63, and a control module 64. The battery pack 61 includes a plurality of battery cells 611 connected in series.

In the battery equalization system shown in FIG. 6, the control module 64 is connected to the acquisition module 62 and the equalization module 63 corresponding to the same unit cell 611 through a channel 610, and the acquisition module 62 and the equalization module 63 time-multiplex the Channel 610.

In one embodiment, the control module 64 includes a control chip that is coupled to the acquisition module 62 and the equalization module 63 corresponding to the same single cell 611 through a pin that passes through the channel 610 and the acquisition module 62. The equalization module 63 is connected.

In the battery equalization system shown in FIG. 7, the control module 64 is connected to the acquisition module 62 and the equalization module 63 corresponding to the same unit cell 611 through two

channels

620, 630, respectively.

In one embodiment, the control module 64 includes a control chip that is respectively connected to the acquisition module 62 and the equalization module 63 corresponding to the same single cell 611 through two pins, the two pins and the two channels 620. 630 one-to-one correspondence, for example, one of the two pins is connected to the equalization module 63 through one of the two channels, and the other of the two pins passes the other of the two channels The channel is connected to the acquisition module 62.

In an embodiment of the present application, the battery equalization system includes: a battery management controller (BMC) and a plurality of battery information collectors (BICs). In one embodiment, the control module described above is disposed in the battery information collector BIC.

In another embodiment, the control module includes a first control unit disposed in the battery information collector and a second control unit disposed in the battery management controller. The collecting module sends the parameter information of the single battery in the collected battery pack to the second control unit through the first control unit; wherein the collecting module and the equalizing module of the same single battery correspond to one connecting channel of the first control unit.

The first control unit can be connected to the acquisition module through the control connection channel, thereby controlling the acquisition module to collect parameter information of the single battery in the battery pack. The second control unit may also send an acquisition instruction to the first control unit through the communication unit to control the connection channel to be connected to the acquisition module by the first control unit.

The first control unit can be connected to the equalization module through the control connection channel, thereby controlling the equalization module to perform equalization processing on the single cells that need to be turned on. The first control unit may send the parameter information of the battery pack collected by the acquisition circuit to the second control unit, and the second control unit determines, according to the parameter information of the battery pack, the unit battery that needs to be turned on, and sends the unit to the first control unit through the communication unit. The equalization instruction is sent to connect the equalization module to the connection channel through the first control unit.

When the acquisition module in the battery equalization system sends the parameter information of the single battery in the collected battery pack to the second control unit through the first control unit, the acquisition module and the equalization module of the same single battery correspond to the first control unit. A connection channel reduces the number of channels required by the first control unit.

The first control unit of the battery information collector and the second control unit of the battery management controller can selectively perform equalization control on the unit cells that need to be equalized. That is, the first control unit may control the equalization module to perform equalization processing on the unit cells that need to be equalized, and the second control unit may also control the equalization module to perform equalization processing on the unit cells that need to be equalized. The first control unit or the second control unit determines the unit cells that need to be equalized according to the parameter information of the battery pack collected by the collection module.

When the battery information collector does not receive the equalization command sent by the battery management controller, the first control unit receives the parameter information of the battery pack, and determines, according to the parameter information of the battery pack, that the single battery in the battery pack needs to be balanced. The control equalization module performs equalization processing on the single cells that need to be turned on.

When the battery information collector receives an instruction for instructing the battery information collector to perform equalization processing, the first control unit receives the parameter information of the battery group, and determines, according to the parameter information of the battery group, that the single battery in the battery group needs to be turned on. The control equalization module performs equalization processing on the single cells that need to be turned on.

When the battery information collector receives the battery management controller failure message, the first control unit receives the parameter information of the battery group, and according to the parameter information of the battery group, determines that a single battery in the battery group needs to be balanced, and the control equalization module is It is necessary to turn on the balanced single cell for equalization processing.

The battery information collector and the battery management controller can selectively control the equalization system through the first control unit and the second control unit, so that one of the battery information collector and the battery management controller can be disabled or malfunctioned. Underneath, the battery balancing system is still guaranteed to operate normally.

In the embodiment of the present application, the collecting module 62 is configured to collect battery information of each single battery in the power battery pack under the control of the control module 64.

The control module 64 is configured to obtain target parameter information of the battery to be equalized in the battery group according to the battery information of each unit battery collected by the collection module 62; obtain historical balance time and historical parameter information of the unit battery to be equalized, history The parameter information is historical information of the target parameter information; determining the target equalization time required for the current equalization of the cells to be equalized according to the target parameter information, the historical equalization duration, and the historical parameter information; controlling the unit cells to be equalized according to the target equalization duration Balance.

The equalization module 63 is configured to equalize the corresponding single cells under the control of the control module 64.

In an embodiment, the target parameter information includes: a difference value of the target parameter;

The control module 64 is configured to acquire target parameters of each of the single cells 611 in the battery pack 61, wherein the target parameter includes any one of the following parameters: voltage, SOC, internal resistance, self-discharge rate, voltage change rate, and power change. Rate and time rate of change;

Determining a reference value of the target parameter according to a target parameter of each of the unit cells 611;

The difference between the target parameters is obtained according to the target parameter of the unit cell to be equalized and the reference value.

In another embodiment, the target parameter information further includes: an available capacity of the battery to be equalized;

The control module 64 is configured to obtain battery information of the battery to be equalized, and the battery information includes at least: a voltage value, a current value, and a temperature value; and the available capacity of the battery to be equalized is obtained according to the battery information of the battery to be equalized.

In another embodiment, the control module 64 is configured to determine the target equalization duration by using the following formula:

Where t _k is the target equalization duration; t _k-1 is the historical equilibrium duration of the last equalization of the cell to be equalized; ΔS _k is the current time, and the target parameter of the cell to be equalized is compared with the reference value of the target parameter ΔS _k-1 is the difference between the target parameter of the cell to be equalized and the reference value of the target parameter in the last equalization time; C _k is the current time, the current available capacity of the cell to be balanced; C _{k -1} is the historical available capacity of the cell to be balanced for the last equalization time.

In another embodiment, the control module 64 is further configured to determine, according to a target parameter of each of the single cells in the battery, a cell to be equalized, wherein the target parameters include: voltage, SOC, internal resistance, At least one of a self-discharge rate, a voltage change rate, a power change rate, and a time change rate.

Accordingly, the present application also provides a vehicle including the battery equalization system of the above embodiment.

Accordingly, the present application also provides a computer readable storage medium having stored thereon computer program instructions that, when executed by a processor, implement the battery balancing method described above.

Accordingly, the present application also provides an electronic device comprising the above computer readable storage medium; and one or more processors for executing a program in a computer readable storage medium.

The preferred embodiments of the present application are described in detail above with reference to the accompanying drawings. However, the present application is not limited to the specific details in the foregoing embodiments, and various simple modifications may be made to the technical solutions of the present application within the technical concept of the present application. These simple variations are within the scope of this application.

It should be further noted that the specific technical features described in the above specific embodiments may be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present application will not be further described in various possible combinations.

In addition, any combination of various embodiments of the present application may be made as long as it does not contradict the idea of the present application, and it should also be regarded as the content disclosed in the present application.

Claims

A battery equalization method, comprising:

Obtaining target parameter information of the battery to be equalized in the battery pack;

Acquiring a historical equalization duration and historical parameter information of the to-be-equalized unit battery, where the historical parameter information is historical information of the target parameter information;

Determining, according to the target parameter information, the historical equalization duration, and the historical parameter information, a target equalization duration required for the current equalization of the to-be-equalized cells;

The equalization of the cells to be equalized is controlled according to the target equalization duration.
The battery equalization method according to claim 1, wherein the target parameter information comprises: a difference value of the target parameter;

The step of acquiring the target parameter information of the unit to be balanced includes:

Obtaining target parameters of each single battery in the power battery pack, wherein the target parameter includes any one of the following parameters: voltage, SOC, internal resistance, self-discharge rate, voltage change rate, power change rate, and time Rate of change

Determining a reference value of the target parameter according to the target parameter of each of the single cells;

Obtaining a difference between the target parameters according to the target parameter of the unit cell to be equalized and the reference value.
The battery equalization method according to claim 2, wherein the target parameter information further comprises: an available capacity of the battery to be equalized;

The step of acquiring target parameter information of the battery to be equalized includes:

Obtaining battery information of the battery to be equalized, the battery information including at least: a voltage value, a current value, and a temperature value;

Obtaining an available capacity of the battery to be equalized according to battery information of the battery to be equalized.
The battery equalization method according to claim 3, wherein the step of determining a target equalization time of the unit cells to be equalized according to the target parameter information, the historical equalization duration, and the historical parameter information include:

The target equalization duration is determined using the following formula:

Where t k is the target equalization duration; t k-1 is the historical equalization duration of the last equalization of the to-be-equalized unit cells; ΔS k is the current time, the target parameters of the unit cells to be equalized and the The difference between the reference values of the target parameters; ΔS k-1 is the difference between the target parameter of the cell to be equalized and the reference value of the target parameter; C k is the current time The current available capacity of the unit battery to be equalized; C k-1 is the last equalization time, and the historical available capacity of the unit battery to be equalized.
The method according to any one of claims 1 to 4, wherein the method further comprises:

Determining the cells to be equalized from the battery group according to target parameters of each of the battery cells in the battery pack, wherein the target parameters include: voltage, SOC, internal resistance, self-discharge rate, voltage change At least one of a rate, a rate of change in power, and a rate of change in time.
A battery equalization system, comprising: a battery pack, an equalization module, an acquisition module, and a control module;

The collecting module is configured to collect battery information of each single battery in the power battery group under the control of the control module;

The control module is configured to obtain target parameter information of the battery to be equalized in the battery group according to the battery information of each of the single cells collected by the collection module, and obtain a historical equalization time of the battery to be equalized and The historical parameter information, the historical parameter information is history information of the target parameter information; determining, according to the target parameter information, the historical equalization duration, and the historical parameter information, the equalization unit of the to-be-equalized unit battery The required target equalization duration; controlling the equalization of the cells to be equalized according to the target equalization duration;

The equalization module is configured to equalize the corresponding single cells under the control of the control module.
The battery equalization system according to claim 6, wherein the target parameter information comprises: a difference value of the target parameter;

The control module is configured to acquire target parameters of each single battery in the power battery group, wherein the target parameter includes any one of the following parameters: voltage, SOC, internal resistance, self-discharge rate, voltage change Rate, rate of change in electricity, and rate of change in time;

Determining a reference value of the target parameter according to the target parameter of each of the single cells;

Obtaining a difference between the target parameters according to the target parameter of the unit cell to be equalized and the reference value.
The battery equalization system according to claim 7, wherein the target parameter information further comprises: an available capacity of the battery to be equalized;

The control module is configured to acquire battery information of the battery to be equalized, and the battery information includes at least: a voltage value, a current value, and a temperature value; and acquiring, according to the battery information of the battery to be equalized, the battery to be equalized Available capacity.
The battery equalization system according to claim 8, wherein the control module is configured to determine the target equalization duration by using the following formula:

Where t k is the target equalization duration; t k-1 is the historical equalization duration of the last equalization of the to-be-equalized unit cells; ΔS k is the current time, the target parameters of the unit cells to be equalized and the The difference between the reference values of the target parameters; ΔS k-1 is the difference between the target parameter of the cell to be equalized and the reference value of the target parameter; C k is the current time, The current available capacity of the unit battery to be equalized; C k-1 is the last equalization time, and the historical available capacity of the unit battery to be equalized.
The battery equalization system according to any one of claims 6 to 9, wherein the control module is further configured to determine from the battery pack according to target parameters of each of the single cells in the battery pack. The equalization unit cell is described, wherein the target parameter includes at least one of a voltage, a SOC, an internal resistance, a self-discharge rate, a voltage change rate, a power change rate, and a time change rate.
The battery equalization system according to claim 6, wherein the control module is connected to an acquisition module and an equalization module corresponding to the same single cell through a channel, and the acquisition module and the equalization module are time-multiplexed. aisle.
The battery equalization system according to claim 11, wherein the control module comprises a control chip, and the control chip is connected to an acquisition module and an equalization module corresponding to the same single cell through a pin, the pin Connecting to the equalization module and the acquisition module through the channel.
The battery equalization system according to claim 6, wherein the control module is respectively connected to the acquisition module and the equalization module corresponding to the same single cell through two channels.
The battery equalization system according to claim 13, wherein the control module comprises a control chip, and the control chip is respectively connected to an acquisition module and an equalization module corresponding to the same single cell through two pins, Two pins are in one-to-one correspondence with the two channels, and one of the two pins is connected to the equalization module through one of the two channels, of the two pins Another pin is coupled to the acquisition module through another of the two channels.
A vehicle characterized by comprising the battery equalization system of any of the preceding claims 6-14.
A computer readable storage medium having stored thereon computer program instructions, wherein the program instructions, when executed by a processor, implement the method of any of claims 1-5.
An electronic device, comprising:

The computer readable storage medium of claim 16;

One or more processors for executing a program in the computer readable storage medium.