CN116381544A - Method and device for detecting battery self-discharge abnormality, electronic equipment and storage medium - Google Patents
Method and device for detecting battery self-discharge abnormality, electronic equipment and storage medium Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
- B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
- B60L3/0046—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to electric energy storage systems, e.g. batteries or capacitors
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/389—Measuring internal impedance, internal conductance or related variables
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
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- 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 application provides a method and a device for detecting battery self-discharge abnormality, electronic equipment and a storage medium, wherein the method comprises the following steps: judging whether the target vehicle meets the balanced starting condition of the battery management system or not based on the battery pack internal pressure difference parameter and the battery pack capacity parameter in the target vehicle data corresponding to the current period; if not, judging whether the battery of the target vehicle has self-discharge abnormal conditions or not according to the voltage difference change trend between the plurality of battery cell voltages and the highest battery cell voltage in the battery pack in the target vehicle data and the voltage change trend of the plurality of battery cells; if so, determining the balance capacity value of each battery cell in each period, and judging whether the battery of the target vehicle has self-discharge abnormal conditions or not based on the consistency of the balance capacity values of each battery cell and the change trend of the balance capacity values of each battery cell. And the self-discharge is detected through the balance capacity value, the self-discharge size and the self-discharge change trend are quantized, and the detection efficiency of the internal short circuit of the battery cell is improved.
Description
Technical Field
The present disclosure relates to the field of battery detection technologies, and in particular, to a method and apparatus for detecting a battery self-discharge abnormality, an electronic device, and a storage medium.
Background
With the increase of the energy density of the battery core, the safety problem of the new energy industry is increasingly outstanding, and the greatest hazard to the electric automobile/energy storage system is a battery thermal runaway accident. In terms of the thermal runaway accident of the battery, the internal short circuit and the external short circuit of the battery are mainly caused by the battery core, the SEI film of the negative electrode of the battery core is mainly characterized in that the SEI film of the negative electrode of the battery core is dissolved, the negative electrode and the components contained in the negative electrode directly react with electrolyte in an exothermic manner, so that the internal temperature is rapidly increased, and the battery core is ignited and exploded. Preventing the occurrence of battery thermal runaway events is therefore an important and difficult aspect of the electric vehicle/energy storage industry.
At present, under the operating condition of the whole vehicle/energy storage system, the battery management system can monitor the battery state in real time, and various manufacturers also monitor the battery pressure difference and the pressure difference increasing trend at present. However, the existing whole vehicle/energy storage system has a battery equalization function, when the voltage difference of the battery core reaches a certain threshold value, the high-voltage battery is discharged, so that the purpose of keeping good voltage consistency is achieved, and the problem of large self-discharge of some batteries is covered. Therefore, according to the use condition of the whole vehicle/energy storage system, how to detect the battery with abnormal self-discharge through the battery data becomes a technical problem which is not small.
Disclosure of Invention
Accordingly, the present application is directed to a method, an apparatus, an electronic device, and a storage medium for detecting a battery self-discharge abnormality, wherein the self-discharge is detected by an equalization capacity value calculated by an equalization function, and the magnitude of the self-discharge and the trend of the self-discharge are quantified, so that a battery cell with early internal short circuit can be detected, an unobservable internal short circuit development process in the battery is quantified, and the detection efficiency of the internal short circuit of the battery cell is improved.
The embodiment of the application provides a detection method for a battery self-discharge abnormality, which comprises the following steps:
acquiring vehicle data of a plurality of periods of a target vehicle;
for a current period of a plurality of periods, judging whether the target vehicle meets the balanced starting condition of a battery management system or not based on the battery pack internal pressure difference parameter and the battery pack capacity parameter in the target vehicle data corresponding to the current period;
if not, judging whether the battery of the target vehicle has self-discharge abnormal conditions or not based on the voltage difference change trend between the plurality of battery cell voltages and the highest battery cell voltage in the battery pack in the target vehicle data and the voltage change trend of the plurality of battery cells;
If so, determining the balance capacity value of each battery cell in each period, and judging whether the battery of the target vehicle has self-discharge abnormal conditions or not based on the consistency of the balance capacity values of each battery cell and the change trend of the balance capacity values of each battery cell.
In one possible embodiment, it is determined whether the target vehicle satisfies a balanced on condition of the battery management system by:
if the battery pack capacity parameter is larger than a preset battery pack capacity parameter and the battery pack internal pressure difference parameter is larger than a preset pressure difference parameter, the target vehicle meets the balanced starting condition of the battery management system;
and if the battery pack inclusion parameter is smaller than or equal to the preset battery pack inclusion parameter and/or the battery pack internal pressure difference parameter is smaller than or equal to the preset pressure difference parameter, the target vehicle does not meet the balanced starting condition of the battery management system.
In one possible implementation manner, the determining whether the self-discharge abnormal situation occurs in the battery of the target vehicle based on the voltage difference variation trend between the plurality of battery cell voltages and the highest battery cell voltage in the battery pack in the target vehicle data and the voltage variation trend of the plurality of battery cells includes:
Judging whether the voltage difference change trend between the battery cell voltages and the highest battery cell voltage in the battery pack in a plurality of periods is an increasing trend or not and whether the voltage change trend of the battery cells is a decreasing trend or not;
if yes, determining that the battery of the target vehicle has self-discharge abnormal conditions;
and if not, determining that the battery of the target vehicle has no self-discharge abnormal condition.
In one possible embodiment, for each of the cells in each cycle, the value of the equilibrium capacity of each cell in each cycle is determined by:
determining a reference balance capacity value of each battery cell based on the product of the balance current and the balance time within the balance start time and the balance end time; the equalization time is the time difference between two adjacent cell voltages of the cell;
and adding the reference balance capacity values within the balance start time and the balance end time to determine the balance capacity value of the battery cell.
In one possible implementation manner, the determining whether the battery of the target vehicle has a self-discharge abnormal condition based on the consistency of the equilibrium capacity value of each battery cell includes:
If the balance capacity values of the battery cells except the target battery cell are the same in the battery cells and the balance capacity values do not show an increasing trend, determining that the battery cells of the battery have no self-discharge abnormal condition;
if the balance capacity values of the other battery cells except the target battery cell are the same in the plurality of battery cells and the balance capacity values of the other battery cells are larger than a preset balance capacity value, determining that the target battery cell has a self-discharge abnormal condition;
if the balance capacity values of the battery cells except the target battery cell are different from each other in the battery cells, ranking the balance capacity values of each battery cell in a descending order, and determining that self-discharge abnormal conditions occur in the battery cells with descending ranking in a plurality of continuous periods;
if the balance capacity values of the other battery cells except the target battery cell are different in the battery cells, determining balance capacity difference values of the other battery cells except the target battery cell in two adjacent periods, and ranking the balance capacity difference values of each battery cell in a descending order to determine self-discharge abnormal conditions of the battery cells with gradually reduced balance capacity difference values.
In one possible implementation manner, the determining, based on the trend of the balanced capacity value of the battery cell, whether the battery of the target vehicle has a self-discharge abnormal situation includes:
if the equilibrium capacity value of any one of the battery cells in the plurality of battery cells shows a trend of decreasing in the plurality of periods, and the change rate of the equilibrium capacity value of the battery cell exceeds the preset change rate, determining that the battery cell of the battery has self-discharge abnormality;
and determining the balance capacity difference values of other battery cells except the target battery cell in two adjacent periods, and if any one battery cell continuously exceeds a plurality of balance capacity difference values to be negative, determining that the battery cell of the battery has self-discharge abnormality.
The embodiment of the application also provides a detection device for the self-discharge abnormality of the battery, which comprises:
an acquisition module for acquiring vehicle data of a plurality of periods of a target vehicle;
the balance judging module is used for judging whether the target vehicle meets the balance starting condition of the battery management system or not according to the current period of the plurality of periods and the battery pack internal pressure difference parameter and the battery pack capacity parameter in the target vehicle data corresponding to the current period;
The first detection module is used for judging whether the battery of the target vehicle has a self-discharge abnormal condition or not based on the voltage difference change trend between the plurality of battery cell voltages and the highest battery cell voltage in the battery pack in the target vehicle data and the voltage change trend of the plurality of battery cells if not;
and the second detection module is used for determining the balance capacity value of each battery cell in each period if the battery cell is in the self-discharge abnormal state, and judging whether the battery of the target vehicle is in the self-discharge abnormal state or not based on the consistency of the balance capacity values of each battery cell and the change trend of the balance capacity values of each battery cell.
In one possible implementation manner, the balancing determination module determines whether the target vehicle meets a balancing start condition of the battery management system by:
if the battery pack capacity parameter is larger than a preset battery pack capacity parameter and the battery pack internal pressure difference parameter is larger than a preset pressure difference parameter, the target vehicle meets the balanced starting condition of the battery management system;
and if the battery pack inclusion parameter is smaller than or equal to the preset battery pack inclusion parameter and/or the battery pack internal pressure difference parameter is smaller than or equal to the preset pressure difference parameter, the target vehicle does not meet the balanced starting condition of the battery management system.
The embodiment of the application also provides electronic equipment, which comprises: the battery self-discharge abnormality detection method comprises a processor, a memory and a bus, wherein the memory stores machine-readable instructions executable by the processor, the processor and the memory are communicated through the bus when the electronic device runs, and the machine-readable instructions are executed by the processor to execute the steps of the battery self-discharge abnormality detection method.
The embodiments of the present application also provide a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of the method for detecting a battery self-discharge abnormality as described above.
The embodiment of the application provides a method, a device, electronic equipment and a storage medium for detecting battery self-discharge abnormality, wherein the method comprises the following steps: acquiring vehicle data of a plurality of periods of a target vehicle; for a current period of a plurality of periods, judging whether the target vehicle meets the balanced starting condition of a battery management system or not based on the battery pack internal pressure difference parameter and the battery pack capacity parameter in the target vehicle data corresponding to the current period; if not, judging whether the battery of the target vehicle has self-discharge abnormal conditions or not based on the voltage difference change trend between the plurality of battery cell voltages and the highest battery cell voltage in the battery pack in the target vehicle data and the voltage change trend of the plurality of battery cells; if so, determining the balance capacity value of each battery cell in each period, and judging whether the battery of the target vehicle has self-discharge abnormal conditions or not based on the consistency of the balance capacity values of each battery cell and the change trend of the balance capacity values of each battery cell. The self-discharge is detected through the equalization capacity value calculated by the equalization function, the self-discharge size and the self-discharge change trend are quantized, the battery core which is short-circuited in the early stage can be detected, the unobservable internal short-circuit development process in the battery is quantized, and the detection efficiency of the internal short circuit of the battery core is improved.
In order to make the above objects, features and advantages of the present application more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered limiting the scope, and that other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flowchart of a method for detecting a battery self-discharge abnormality according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a device for detecting a battery self-discharge abnormality according to an embodiment of the present disclosure;
FIG. 3 is a second schematic diagram of a device for detecting abnormal self-discharge of a battery according to an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it should be understood that the accompanying drawings in the present application are only for the purpose of illustration and description, and are not intended to limit the protection scope of the present application. In addition, it should be understood that the schematic drawings are not drawn to scale. A flowchart, as used in this application, illustrates operations implemented according to some embodiments of the present application. It should be appreciated that the operations of the flow diagrams may be implemented out of order and that steps without logical context may be performed in reverse order or concurrently. Moreover, one or more other operations may be added to the flow diagrams and one or more operations may be removed from the flow diagrams as directed by those skilled in the art.
In addition, the described embodiments are only some, but not all, of the embodiments of the present application. The components of the embodiments of the present application, which are generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present application, as provided in the accompanying drawings, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present application without making any inventive effort, are intended to be within the scope of the present application.
In order to enable one skilled in the art to utilize the present disclosure, the following embodiments are provided in connection with a particular application scenario "self-discharge detection of a battery," and the generic principles defined herein may be applied to other embodiments and application scenarios without departing from the spirit or scope of the present disclosure.
The method, the device, the electronic equipment or the computer readable storage medium described below in the embodiments of the present application may be applied to any scenario in which self-discharge detection of a battery is required, and the embodiments of the present application do not limit specific application scenarios, and any scheme using the method, the device, the electronic equipment and the storage medium for detecting self-discharge abnormality of a battery provided in the embodiments of the present application is within the scope of protection of the present application.
First, application scenarios applicable to the present application will be described. The application can be applied to the technical field of battery detection.
According to research, at the present stage, under the operating condition of the whole vehicle/energy storage system, the battery management system can monitor the battery state in real time, and at present, all manufacturers have the trend of monitoring the battery pressure difference and increasing the pressure difference. However, the existing whole vehicle/energy storage system has a battery equalization function, when the voltage difference of the battery core reaches a certain threshold value, the high-voltage battery is discharged, so that the purpose of keeping good voltage consistency is achieved, and the problem of large self-discharge of some batteries is covered. Therefore, according to the use condition of the whole vehicle/energy storage system, how to detect the battery with abnormal self-discharge through the battery data becomes a technical problem which is not small.
Based on this, the embodiment of the application provides a method for detecting battery self-discharge abnormality, which detects self-discharge through an equilibrium capacity value calculated by an equilibrium function, quantifies the self-discharge size and the change trend of the self-discharge, realizes that not only can the early internal short-circuit cell be detected, but also the unobservable internal short-circuit development process in the battery can be quantified, and improves the detection efficiency of the internal short-circuit of the cell.
Referring to fig. 1, fig. 1 is a flowchart of a method for detecting a battery self-discharge abnormality according to an embodiment of the present disclosure. As shown in fig. 1, a detection method provided in an embodiment of the present application includes:
s101: vehicle data of a plurality of cycles of a target vehicle is acquired.
In the step, vehicle data of a plurality of periods of a target vehicle are screened out from a cloud server.
Here, each week may be regarded as one cycle.
The vehicle data includes other data such as a battery pack internal pressure difference parameter, a battery pack capacity parameter and the like of the target vehicle in the period.
S102: and judging whether the target vehicle meets the balanced starting condition of the battery management system or not according to the current period of the plurality of periods and based on the battery pack internal pressure difference parameter and the battery pack capacity parameter in the target vehicle data corresponding to the current period.
In the step, for a current period of the plurality of periods, whether the target vehicle meets the balanced opening condition of the battery management system is judged according to the battery pack internal pressure difference parameter and the battery pack content parameter in the target vehicle data corresponding to the current period.
Here, the plurality of periods are history periods, the current period is a period at which a time point is the nearest among the plurality of history periods, for example, 11 months 1 to 7 of 2022 are one period, 11 months 8 to 15 are one period, 11 months 16 to 23 are one period, and the period corresponding to 11 months 16 to 23 is the current period.
The balanced opening condition comprises that the battery containing capacity parameter is larger than the preset battery pack capacity parameter, and the battery pack internal pressure difference parameter is larger than the preset pressure difference parameter.
The internal pressure difference parameter and the capacity parameter of the battery pack are determined by the existing technical means, and the details of the internal pressure difference parameter and the capacity parameter of the battery pack are not repeated.
In one possible embodiment, it is determined whether the target vehicle satisfies a balanced on condition of the battery management system by:
a: and if the battery pack capacity parameter is larger than a preset battery pack capacity parameter and the battery pack internal pressure difference parameter is larger than a preset pressure difference parameter, the target vehicle meets the balanced starting condition of the battery management system.
Here, if the battery pack capacity parameter is greater than the preset battery pack capacity parameter and the battery pack internal pressure difference parameter is greater than the preset pressure difference parameter, the target vehicle satisfies the balanced opening condition of the battery management system.
The preset battery pack capacity parameter and the preset pressure difference parameter are determined through expert experience.
B: and if the battery pack inclusion parameter is smaller than or equal to the preset battery pack inclusion parameter and/or the battery pack internal pressure difference parameter is smaller than or equal to the preset pressure difference parameter, the target vehicle does not meet the balanced starting condition of the battery management system.
Here, if the battery pack capacity parameter is equal to or smaller than the preset battery pack capacity parameter and/or the battery pack internal pressure difference parameter is equal to or smaller than the preset pressure difference parameter, the target vehicle does not satisfy the balanced opening condition of the battery management system.
Here, when any one of the conditions occurs that the battery pack capacity parameter is equal to or less than the preset battery pack capacity parameter or that the battery pack internal pressure difference parameter is equal to or less than the preset pressure difference parameter, the target vehicle does not satisfy the balanced opening condition of the battery management system.
Here, the balanced shut-off condition is determined by: when it is determined that the actual balancing time is equal to the preset balancing time, a Battery Management System (BMS) turns off the balancing function.
In a specific embodiment, whether the target vehicle meets the conditions of passive equalization on and off of the BMS is judged, for example, when the capacity parameter of the battery pack is greater than 30%, the internal pressure difference parameter of the battery pack is greater than 2mV, the BMS starts an equalization function, the voltage is converted into SOC and capacity to be equalized, so that the required equalization time is calculated, and when the actual equalization time is equal to the preset required equalization time, the BMS closes the equalization function.
S103: if not, judging whether the battery of the target vehicle has self-discharge abnormal conditions or not based on the voltage difference change trend between the plurality of battery cell voltages and the highest battery cell voltage in the battery pack in the target vehicle data and the voltage change trend of the plurality of battery cells.
In the step, if the balanced opening condition of the battery management system is not satisfied, according to the trend of variation of the voltage difference between the plurality of cell voltages and the highest cell voltage in the battery pack in the target vehicle data
And judging whether the battery of the target vehicle has self-discharge abnormality 5 according to the voltage change trend of the plurality of battery cells.
Here, when the internal pressure difference of the battery pack does not meet the balanced opening condition (the pressure difference is smaller), that is, the BMS does not open the balancing function for a plurality of continuous periods, the voltage difference variation trend between the battery cells and the highest cell voltage in the battery pack is used for comprehensively judging whether the self-discharge abnormal condition occurs or not.
0 in one possible embodiment, the battery pack based on the target vehicle data
The voltage difference change trend between the plurality of battery cell voltages and the highest battery cell voltage and the voltage change trend of the plurality of battery cells determine whether the battery of the target vehicle has a self-discharge abnormal condition, including:
(1): determining a plurality of cell voltages and a highest cell voltage in the battery pack over a plurality of cycles
Whether the voltage difference change trend between the battery cells is an increasing trend or not and whether the voltage change trend of the plurality of battery cells is a decreasing trend or not is 5.
Here, it is determined whether a voltage difference variation trend between a plurality of cell voltages and a highest cell voltage in the battery pack and a voltage variation trend of the plurality of cells in the plurality of cycles are a decreasing trend.
(2): and if so, determining that the battery of the target vehicle has self-discharge abnormal conditions.
If yes, it is determined that the battery of the target vehicle has abnormal self-discharge.
0 (3): and if not, determining that the battery of the target vehicle has no self-discharge abnormal condition.
If not, it is determined that the battery of the target vehicle has no self-discharge abnormality.
In an embodiment, when the pressure difference in the battery pack does not satisfy the balance on condition (the pressure difference is small), i.e., the BMS does not turn on the balance function for a plurality of consecutive cycles, the maximum pressure difference in the battery pack is passed,
and comprehensively judging whether self-discharge abnormal conditions occur or not according to the voltage difference change trend between a plurality of battery cells in the battery pack and the highest battery cell voltage, the voltage ranking change trend 5, and the like. And determining that the battery of the target vehicle has self-discharge abnormal conditions if the voltage difference change trend between the battery pack and the highest battery voltage in the battery pack in a plurality of periods is an increasing trend and the ranking of the battery voltages is a decreasing trend. And determining that the battery of the target vehicle has no self-discharge abnormal condition if the voltage difference change trend between the battery pack and the highest battery voltage in the battery pack does not increase and the row names of the battery voltages are in a decreasing trend in a plurality of periods.
S104: if so, determining the balance capacity value of each battery cell in each period, and judging whether the battery of the target vehicle has self-discharge abnormal conditions or not based on the consistency of the balance capacity values of each battery cell and the change trend of the balance capacity values of each battery cell.
In the step, if the target vehicle meets the balanced opening condition of the battery management system, determining the balanced capacity value of each cell in each period, and judging whether the battery of the target vehicle has self-discharge abnormal conditions according to the consistency of the balanced capacity value of each cell and the variation trend of the balanced capacity value of each cell.
Here, when the balancing condition is satisfied, that is, the BMS continuously turns on the balancing function for a plurality of periods, the balancing capacity value of each cell in each sliding window is calculated based on the conditions that the passive balancing function is turned on and off.
In one possible embodiment, for each of the cells in each cycle, the value of the equilibrium capacity of each cell in each cycle is determined by:
a: determining a reference balance capacity value of each battery cell based on the product of the balance current and the balance time within the balance start time and the balance end time; the equalization time is the time difference between two adjacent cell voltages of the acquired cell.
Here, the reference balance capacity value of each cell is determined according to the product of the balance current and the balance time within the balance on time and the balance off time.
The equalization start time is a time point when the voltage difference between each cell and the cell corresponding to the lowest voltage reaches a threshold value and each cell voltage is not in the low SOC interval.
The equalization ending time is a time point when the actual equalization time is equal to the preset equalization time.
Here, the equalization time is the time difference between two adjacent cell voltages of the cell, for example, if 00:15 collects the first cell voltage of the cell and 00:30 collects the second cell voltage of the cell, the time difference is 00:15.
Wherein the equalization time is within an equalization on time and an equalization end time.
The balancing current is changed according to the change of the cell voltage, and the balancing current=cell voltage/balancing resistance value.
b: and adding the reference balance capacity values within the balance start time and the balance end time to determine the balance capacity value of the battery cell.
Here, the equalization start time and the equalization end time are summed up by a plurality of reference equalization capacity values to determine the equalization capacity value of the cell.
In one possible implementation manner, the determining whether the battery of the target vehicle has a self-discharge abnormal condition based on the consistency of the equilibrium capacity value of each battery cell includes:
i: and if the balance capacity values of the battery cells except the target battery cell are the same in the battery cells and the balance capacity values do not show an increasing trend, determining that the battery cells of the battery have no self-discharge abnormal condition.
Here, if the equilibrium capacity values of all the cells except the target cell are the same in a plurality of periods, and the equilibrium capacity values of the cells except the target cell do not show an increasing trend, it is determined that the self-discharge abnormal condition does not occur in the plurality of cells of the battery.
If the balance capacity values of all the cells except the target cell A are the same and have no increasing trend, the consistency of the cells is good, and no self-discharge abnormal condition occurs.
II: and if the balance capacity values of the other battery cells except the target battery cell in the battery cells are the same, and the balance capacity values of the other battery cells are larger than a preset balance capacity value, determining that the self-discharge abnormal condition occurs in the target battery cell.
Here, if the balance capacity values of the other battery cells except the target battery cell in the battery cells in the plurality of periods are the same, and the balance capacity values of the other battery cells are larger than the preset balance capacity value, determining that the self-discharge abnormal condition occurs in the target battery cell.
And judging that the self-discharge of the target battery cell A is abnormal if the balance capacity values of all the battery cells except the target battery cell A are the same and have an increasing trend and the increasing trend exceeds 10 mV/day.
III: and if the balance capacity values of the other battery cells except the target battery cell are different in the battery cells, ranking the balance capacity values of each battery cell in a descending order, and determining that self-discharge abnormal conditions occur in the battery cells with descending ranking in a plurality of continuous periods.
If the balance capacity values of the other cells except the target cell are different from each other in the plurality of cells, the balance capacity values of the cells are ranked in a descending order, and the self-discharge abnormal condition of the cells with descending ranking in a plurality of continuous periods in the battery is determined.
And if the ranking of the battery cells B continuously exceeds 4 periods and is lowered, the trend of increasing the self-discharge of the battery cell B is indicated, namely the self-discharge abnormality of the battery cell B is judged.
IV: if the balance capacity values of the other battery cells except the target battery cell are different in the battery cells, determining balance capacity difference values of the other battery cells except the target battery cell in two adjacent periods, and ranking the balance capacity difference values of each battery cell in a descending order to determine self-discharge abnormal conditions of the battery cells with gradually reduced balance capacity difference values.
Here, if the balanced capacity values of the other cells except the target cell are different in the multiple cells, the balanced capacity difference values of the other cells except the target cell in two adjacent periods are determined, the balanced capacity difference values of each cell are ranked in a descending order, and the self-discharge abnormal condition of the cell with the gradually reduced balanced capacity difference value in the battery is determined.
If the balance capacity values of all the cells except the target cell a are different, calculating the balance capacity difference value (the next cycle is subtracted from the previous cycle) of two adjacent cycles of all the cells except the target cell a, ranking the cells from large to small based on the balance capacity difference value, if the ranking of the cells B continuously exceeds 4 cycles and decreases, indicating that the cells have a tendency of increasing self-discharge, and judging that the cells B have abnormal self-discharge.
In one possible implementation manner, the determining, based on the trend of the balanced capacity value of the battery cell, whether the battery of the target vehicle has a self-discharge abnormal situation includes:
i: and if the balanced capacity value of any one of the battery cells shows a trend of decreasing in a plurality of periods, and the change rate of the balanced capacity value of the battery cell exceeds the preset change rate, determining that the battery cell of the battery has self-discharge abnormality.
Here, if the equilibrium capacity value of any one of the multiple battery cells shows a decreasing trend in multiple periods, and the change rate of the equilibrium capacity value of the battery cell exceeds the preset change rate, it is determined that the battery cell of the battery has a self-discharge abnormality.
If the equilibrium capacity values of all the cells except the target cell A are different, the self-discharge abnormal cell detection can be performed based on the equilibrium capacity change of each cell, and if the equilibrium capacity value of a certain cell B is continuously reduced and the change rate of the equilibrium capacity value exceeds 10 mV/day, the trend that the self-discharge of the cell is increased is indicated, namely the self-discharge abnormality of the cell B is judged.
ii: and determining the balance capacity difference values of other battery cells except the target battery cell in two adjacent periods, and if any one battery cell continuously exceeds a plurality of balance capacity difference values to be negative, determining that the battery cell of the battery has self-discharge abnormality.
Here, the balance capacity difference values of other battery cells except the target battery cell in two adjacent periods are determined, and if any one battery cell continuously exceeds a plurality of balance capacity difference values to be negative, the battery cell of the battery is determined to have self-discharge abnormality.
If the balanced capacity values of all the cells except the target cell a are different, the balanced capacity difference value (the period after the period is subtracted from the period before the period) of two adjacent windows of all the cells except the target cell a is calculated, if the balanced capacity difference value of the cell B continuously exceeds 4 periods is negative, the trend that the self-discharge of the cell is increased is indicated, and the self-discharge abnormality of the cell B is judged. Here, the specific number of consecutive exceeding periods is not limited.
Here, if the self-discharge abnormality detection method based on the equalization capacity consistency and the equalization capacity change detects that a certain cell B is abnormal in self-discharge, it is determined that the cell has an internal short-circuit risk.
Here, the self-discharge cannot directly calculate the cause of the pressure difference: when the pressure difference is smaller, the BMS equalization function is not started, and the self-discharge abnormality can be judged directly through the pressure difference change. When the voltage difference is large, the BMS can start the equalization function, and at the moment, the equalization function can discharge the battery cells with the lowest voltage difference exceeding the threshold value, so that the voltage difference cannot be increased or even reduced, and the self-discharge abnormality cannot be judged through the voltage difference change.
The embodiment of the application provides a detection method for a battery self-discharge abnormality, which comprises the following steps: acquiring vehicle data of a plurality of periods of a target vehicle; for a current period of a plurality of periods, judging whether the target vehicle meets the balanced starting condition of a battery management system or not based on the battery pack internal pressure difference parameter and the battery pack capacity parameter in the target vehicle data corresponding to the current period; if not, judging whether the battery of the target vehicle has self-discharge abnormal conditions or not based on the voltage difference change trend between the plurality of battery cell voltages and the highest battery cell voltage in the battery pack in the target vehicle data and the voltage change trend of the plurality of battery cells; if so, determining the balance capacity value of each battery cell in each period, and judging whether the battery of the target vehicle has self-discharge abnormal conditions or not based on the consistency of the balance capacity values of each battery cell and the change trend of the balance capacity values of each battery cell. The self-discharge is detected through the equalization capacity value calculated by the equalization function, the self-discharge size and the self-discharge change trend are quantized, the battery core which is short-circuited in the early stage can be detected, the unobservable internal short-circuit development process in the battery is quantized, and the detection efficiency of the internal short circuit of the battery core is improved.
Referring to fig. 2 and 3, fig. 2 is a schematic structural diagram of a device for detecting a battery self-discharge abnormality according to an embodiment of the present disclosure; fig. 3 is a second schematic structural diagram of a device for detecting a battery self-discharge abnormality according to an embodiment of the present disclosure. As shown in fig. 2, the battery self-discharge abnormality detection device 200 includes:
an acquisition module 210 for acquiring vehicle data of a plurality of cycles of a target vehicle;
the balancing determination module 220 is configured to determine, for a current period of a plurality of periods, whether the target vehicle meets a balancing start condition of a battery management system based on a battery pack internal pressure difference parameter and a battery pack capacity parameter in target vehicle data corresponding to the current period;
the first detection module 230 is configured to determine whether a self-discharge abnormal condition occurs in the battery of the target vehicle based on a voltage difference variation trend between the plurality of battery cell voltages and the highest battery cell voltage in the battery pack in the target vehicle data and the voltage variation trend of the plurality of battery cells if not;
and the second detection module 240 is configured to determine an equilibrium capacity value of each battery cell in each period if the battery cell is in the first period, and determine whether a self-discharge abnormal condition occurs in the battery of the target vehicle based on consistency of the equilibrium capacity values of each battery cell and a change trend of the equilibrium capacity values of each battery cell.
In one possible implementation, the balancing determination module 220 determines whether the target vehicle meets a balanced on condition of the battery management system by:
if the battery pack capacity parameter is larger than a preset battery pack capacity parameter and the battery pack internal pressure difference parameter is larger than a preset pressure difference parameter, the target vehicle meets the balanced starting condition of the battery management system;
and if the battery pack inclusion parameter is smaller than or equal to the preset battery pack inclusion parameter and/or the battery pack internal pressure difference parameter is smaller than or equal to the preset pressure difference parameter, the target vehicle does not meet the balanced starting condition of the battery management system.
In one possible implementation manner, when the first detection module 230 is configured to determine whether the self-discharge abnormal situation occurs in the battery of the target vehicle based on the voltage difference variation trend between the plurality of battery cell voltages and the highest battery cell voltage in the battery pack in the target vehicle data and the voltage variation trend of the plurality of battery cells, the first detection module 230 is specifically configured to:
judging whether the voltage difference change trend between the battery cell voltages and the highest battery cell voltage in the battery pack in a plurality of periods is an increasing trend or not and whether the voltage change trend of the battery cells is a decreasing trend or not;
If yes, determining that the battery of the target vehicle has self-discharge abnormal conditions;
and if not, determining that the battery of the target vehicle has no self-discharge abnormal condition.
Further, as shown in fig. 3, the apparatus 200 for detecting a battery self-discharge abnormality further includes an equilibrium capacity value determining module 250, where the equilibrium capacity value determining module 250 is configured to:
determining a reference balance capacity value of each battery cell based on the product of the balance current and the balance time within the balance start time and the balance end time; the equalization time is the time difference between two adjacent cell voltages of the cell;
and adding the reference balance capacity values within the balance start time and the balance end time to determine the balance capacity value of the battery cell.
In one possible implementation manner, when the second detection module 240 is configured to determine whether the battery of the target vehicle has a self-discharge abnormal situation based on the consistency of the balance capacity values of each of the battery cells, the second detection module 240 is specifically configured to:
if the balance capacity values of the battery cells except the target battery cell are the same in the battery cells and the balance capacity values do not show an increasing trend, determining that the battery cells of the battery have no self-discharge abnormal condition;
If the balance capacity values of the other battery cells except the target battery cell are the same in the plurality of battery cells and the balance capacity values of the other battery cells are larger than a preset balance capacity value, determining that the target battery cell has a self-discharge abnormal condition;
if the balance capacity values of the battery cells except the target battery cell are different from each other in the battery cells, ranking the balance capacity values of each battery cell in a descending order, and determining that self-discharge abnormal conditions occur in the battery cells with descending ranking in a plurality of continuous periods;
if the balance capacity values of the other battery cells except the target battery cell are different in the battery cells, determining balance capacity difference values of the other battery cells except the target battery cell in two adjacent periods, and ranking the balance capacity difference values of each battery cell in a descending order to determine self-discharge abnormal conditions of the battery cells with gradually reduced balance capacity difference values.
In one possible implementation manner, when the second detection module 240 is configured to determine whether the battery of the target vehicle has a self-discharge abnormal condition based on the trend of the equilibrium capacity value of the battery cell, the second detection module 240 is specifically configured to:
If the equilibrium capacity value of any one of the battery cells in the plurality of battery cells shows a trend of decreasing in the plurality of periods, and the change rate of the equilibrium capacity value of the battery cell exceeds the preset change rate, determining that the battery cell of the battery has self-discharge abnormality;
and determining the balance capacity difference values of other battery cells except the target battery cell in two adjacent periods, and if any one battery cell continuously exceeds a plurality of balance capacity difference values to be negative, determining that the battery cell of the battery has self-discharge abnormality.
The embodiment of the application provides a detection device of battery self-discharge abnormality, detection device includes: an acquisition module for acquiring vehicle data of a plurality of periods of a target vehicle; the balance judging module is used for judging whether the target vehicle meets the balance starting condition of the battery management system or not according to the current period of the plurality of periods and the battery pack internal pressure difference parameter and the battery pack capacity parameter in the target vehicle data corresponding to the current period; the first detection module is used for judging whether the battery of the target vehicle has a self-discharge abnormal condition or not based on the voltage difference change trend between the plurality of battery cell voltages and the highest battery cell voltage in the battery pack in the target vehicle data and the voltage change trend of the plurality of battery cells if not; and the second detection module is used for determining the balance capacity value of each battery cell in each period if the battery cell is in the self-discharge abnormal state, and judging whether the battery of the target vehicle is in the self-discharge abnormal state or not based on the consistency of the balance capacity values of each battery cell and the change trend of the balance capacity values of each battery cell. The self-discharge is detected through the equalization capacity value calculated by the equalization function, the self-discharge size and the self-discharge change trend are quantized, the battery core which is short-circuited in the early stage can be detected, the unobservable internal short-circuit development process in the battery is quantized, and the detection efficiency of the internal short circuit of the battery core is improved.
Referring to fig. 4, fig. 4 is a schematic structural diagram of an electronic device according to an embodiment of the present application. As shown in fig. 4, the electronic device 400 includes a processor 410, a memory 420, and a bus 430.
The memory 420 stores machine-readable instructions executable by the processor 410, when the electronic device 400 is running, the processor 410 communicates with the memory 420 through the bus 430, and when the machine-readable instructions are executed by the processor 410, the steps of detecting the battery self-discharge abnormality in the method embodiment shown in fig. 1 can be executed, and the specific implementation manner can be referred to the method embodiment and will not be described herein.
The embodiment of the present application further provides a computer readable storage medium, where a computer program is stored on the computer readable storage medium, and the computer program may execute the steps of the method for detecting a battery self-discharge abnormality in the method embodiment shown in fig. 1 when the computer program is executed by a processor, and the specific implementation manner may refer to the method embodiment and will not be described herein.
It will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, and are not repeated herein.
In the several embodiments provided in this application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. The above-described apparatus embodiments are merely illustrative, for example, the division of the units is merely a logical function division, and there may be other manners of division in actual implementation, and for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be through some communication interface, device or unit indirect coupling or communication connection, which may be in electrical, mechanical or other form.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in each embodiment of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a non-volatile computer readable storage medium executable by a processor. Based on such understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
Finally, it should be noted that: the foregoing examples are merely specific embodiments of the present application, and are not intended to limit the scope of the present application, but the present application is not limited thereto, and those skilled in the art will appreciate that while the foregoing examples are described in detail, the present application is not limited thereto. Any person skilled in the art may modify or easily conceive of the technical solution described in the foregoing embodiments, or make equivalent substitutions for some of the technical features within the technical scope of the disclosure of the present application; such modifications, changes or substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application, and are intended to be included in the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. A method for detecting a self-discharge abnormality of a battery, the method comprising:
acquiring vehicle data of a plurality of periods of a target vehicle;
for a current period of a plurality of periods, judging whether the target vehicle meets the balanced starting condition of a battery management system or not based on the battery pack internal pressure difference parameter and the battery pack capacity parameter in the target vehicle data corresponding to the current period;
if not, judging whether the battery of the target vehicle has self-discharge abnormal conditions or not based on the voltage difference change trend between the plurality of battery cell voltages and the highest battery cell voltage in the battery pack in the target vehicle data and the voltage change trend of the plurality of battery cells;
if so, determining the balance capacity value of each battery cell in each period, and judging whether the battery of the target vehicle has self-discharge abnormal conditions or not based on the consistency of the balance capacity values of each battery cell and the change trend of the balance capacity values of each battery cell.
2. The detection method according to claim 1, wherein it is determined whether the target vehicle satisfies a balanced on condition of a battery management system by:
If the battery pack capacity parameter is larger than a preset battery pack capacity parameter and the battery pack internal pressure difference parameter is larger than a preset pressure difference parameter, the target vehicle meets the balanced starting condition of the battery management system;
and if the battery pack inclusion parameter is smaller than or equal to the preset battery pack inclusion parameter and/or the battery pack internal pressure difference parameter is smaller than or equal to the preset pressure difference parameter, the target vehicle does not meet the balanced starting condition of the battery management system.
3. The detection method according to claim 1, wherein the determining whether the battery of the target vehicle has a self-discharge abnormality based on a voltage difference variation trend between a plurality of cell voltages and a highest cell voltage in a battery pack in the target vehicle data and a voltage variation trend of a plurality of cells includes:
judging whether the voltage difference change trend between the battery cell voltages and the highest battery cell voltage in the battery pack in a plurality of periods is an increasing trend or not and whether the voltage change trend of the battery cells is a decreasing trend or not;
if yes, determining that the battery of the target vehicle has self-discharge abnormal conditions;
And if not, determining that the battery of the target vehicle has no self-discharge abnormal condition.
4. The method of claim 1, wherein for each of the cells in each cycle, the value of the equilibrium capacity of each cell in each cycle is determined by:
determining a reference balance capacity value of each battery cell based on the product of the balance current and the balance time within the balance start time and the balance end time; the equalization time is the time difference between two adjacent cell voltages of the cell;
and adding the reference balance capacity values within the balance start time and the balance end time to determine the balance capacity value of the battery cell.
5. The detection method according to claim 1, wherein the determining whether the battery of the target vehicle has a self-discharge abnormality based on the consistency of the equilibrium capacity value of each of the battery cells includes:
if the balance capacity values of the battery cells except the target battery cell are the same in the battery cells and the balance capacity values do not show an increasing trend, determining that the battery cells of the battery have no self-discharge abnormal condition;
If the balance capacity values of the other battery cells except the target battery cell are the same in the plurality of battery cells and the balance capacity values of the other battery cells are larger than a preset balance capacity value, determining that the target battery cell has a self-discharge abnormal condition;
if the balance capacity values of the battery cells except the target battery cell are different from each other in the battery cells, ranking the balance capacity values of each battery cell in a descending order, and determining that self-discharge abnormal conditions occur in the battery cells with descending ranking in a plurality of continuous periods;
if the balance capacity values of the other battery cells except the target battery cell are different in the battery cells, determining balance capacity difference values of the other battery cells except the target battery cell in two adjacent periods, and ranking the balance capacity difference values of each battery cell in a descending order to determine self-discharge abnormal conditions of the battery cells with gradually reduced balance capacity difference values.
6. The detection method according to claim 1, wherein the determining whether the battery of the target vehicle has a self-discharge abnormality based on the trend of the equilibrium capacity value of the battery cell includes:
If the equilibrium capacity value of any one of the battery cells in the plurality of battery cells shows a trend of decreasing in the plurality of periods, and the change rate of the equilibrium capacity value of the battery cell exceeds the preset change rate, determining that the battery cell of the battery has self-discharge abnormality;
and determining the balance capacity difference values of other battery cells except the target battery cell in two adjacent periods, and if any one battery cell continuously exceeds a plurality of balance capacity difference values to be negative, determining that the battery cell of the battery has self-discharge abnormality.
7. A detection device for a battery self-discharge abnormality, the detection device comprising:
an acquisition module for acquiring vehicle data of a plurality of periods of a target vehicle;
the balance judging module is used for judging whether the target vehicle meets the balance starting condition of the battery management system or not according to the current period of the plurality of periods and the battery pack internal pressure difference parameter and the battery pack capacity parameter in the target vehicle data corresponding to the current period;
the first detection module is used for judging whether the battery of the target vehicle has a self-discharge abnormal condition or not based on the voltage difference change trend between the plurality of battery cell voltages and the highest battery cell voltage in the battery pack in the target vehicle data and the voltage change trend of the plurality of battery cells if not;
And the second detection module is used for determining the balance capacity value of each battery cell in each period if the battery cell is in the self-discharge abnormal state, and judging whether the battery of the target vehicle is in the self-discharge abnormal state or not based on the consistency of the balance capacity values of each battery cell and the change trend of the balance capacity values of each battery cell.
8. The apparatus according to claim 7, wherein the equalization judging module determines whether the target vehicle satisfies an equalization on condition of a battery management system by:
if the battery pack capacity parameter is larger than a preset battery pack capacity parameter and the battery pack internal pressure difference parameter is larger than a preset pressure difference parameter, the target vehicle meets the balanced starting condition of the battery management system;
and if the battery pack inclusion parameter is smaller than or equal to the preset battery pack inclusion parameter and/or the battery pack internal pressure difference parameter is smaller than or equal to the preset pressure difference parameter, the target vehicle does not meet the balanced starting condition of the battery management system.
9. An electronic device, comprising: a processor, a memory and a bus, said memory storing machine readable instructions executable by said processor, said processor and said memory communicating via said bus when the electronic device is running, said machine readable instructions when executed by said processor performing the steps of the method for detecting a battery self-discharge abnormality according to any one of claims 1 to 6.
10. A computer-readable storage medium, wherein a computer program is stored on the computer-readable storage medium, which when executed by a processor performs the steps of the method for detecting a battery self-discharge abnormality according to any one of claims 1 to 6.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116774064B (en) * | 2023-08-22 | 2024-01-16 | 宁德时代新能源科技股份有限公司 | Battery self-discharge detection method, device, equipment and storage medium |
| CN118625200A (en) * | 2024-08-09 | 2024-09-10 | 长江三峡集团实业发展(北京)有限公司 | Battery consistency early warning method, device, equipment and medium |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116774064B (en) * | 2023-08-22 | 2024-01-16 | 宁德时代新能源科技股份有限公司 | Battery self-discharge detection method, device, equipment and storage medium |
| CN118625200A (en) * | 2024-08-09 | 2024-09-10 | 长江三峡集团实业发展(北京)有限公司 | Battery consistency early warning method, device, equipment and medium |
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