A method for calculating the self-consumption coefficient of a battery, a battery and a storage medium

Abstract

The present application provides a method for calculating the self-consumption coefficient of a battery, a battery and a storage medium, the method comprising: respectively calculating the first charge capacity of each battery cell during the first charging process to obtain multiple first charge capacities; obtaining the minimum value of multiple first charge capacities to obtain the first charge minimum value, obtaining the maximum value of multiple first charge capacities to obtain the first charge maximum value, and calculating the first charge difference; respectively calculating the charging capacity of each battery cell during the current charging process to obtain multiple charging capacities; obtaining the minimum value of multiple charging capacities to obtain the charging minimum value, obtaining the maximum value of multiple charging capacities to obtain the charging maximum value, and calculating the charging difference; calculating the charging capacity difference; calculating the time difference between the current charging process and the first charging process to obtain the charging time difference; calculating the ratio of the charging capacity difference to the charging time difference to obtain the first self-consumption coefficient of the battery, so that it is possible to detect whether the battery has excessive self-consumption according to the first self-consumption coefficient.

Description

Technical Field

[0001] This application relates to the field of energy storage technology, and in particular to a method for calculating the self-dissipation coefficient of a battery, a battery, and a storage medium. Background Technology

[0002] In the field of energy storage, two or more cells are typically connected together to form a battery pack, which can significantly increase the overall usable capacity of the battery. Furthermore, the number of cells can be adjusted according to actual needs to adapt to different application scenarios and load requirements. In applications with high capacity requirements, multiple batteries can be connected together to form a battery pack. Due to differences in the production, usage history, and environmental conditions of individual cells, varying degrees of self-discharge may occur; that is, capacity loss occurs when the battery is not in use due to chemical reactions and electron flow within the individual cells.

[0003] However, the inventors of this application discovered during the implementation of the embodiments of this application that, since the battery cells are connected in series or parallel to form a battery, the battery capacity and lifespan are related to the consistency between the individual cells. Cell self-discharge affects cell consistency; cells with inconsistent self-discharge will result in large differences in SOC (state of charge) between cells after storage or use for a period of time, and reduce battery capacity, significantly impacting battery safety and performance. Therefore, it is necessary to calculate the battery's self-discharge coefficient, a parameter used for detecting battery self-discharge. Summary of the Invention

[0004] In view of the above problems, this application provides a method for calculating the self-dissipation coefficient of a battery, a battery, and a storage medium, which overcomes the above problems or at least partially solves the problem of needing to calculate the self-dissipation coefficient of a battery.

[0005] According to one aspect of this application, a method for calculating the self-dissipation coefficient of a battery is provided. The battery includes multiple cells. The method includes: calculating the initial charge amount of each cell during the first charging process to obtain multiple initial charge amounts; obtaining the minimum value of the multiple initial charge amounts to obtain a minimum initial charge value; obtaining the maximum value of the multiple initial charge amounts to obtain a maximum initial charge value; calculating the difference between the maximum and minimum initial charge values ​​to obtain an initial charge gap; calculating the charging amount of each cell during the current charging process to obtain multiple charging amounts; taking the minimum value of the multiple charging amounts to obtain a minimum charging value; obtaining the maximum value of the multiple charging amounts to obtain a maximum charging value; calculating the difference between the maximum and minimum charging values ​​to obtain a charging gap; calculating the difference between the initial charge gap and the charging gap to obtain a charging amount difference; calculating the difference between the charging cutoff time of the current charging process and the charging cutoff time of the first charging process to obtain a charging time difference; and calculating the ratio of the charging amount difference to the charging time difference to obtain a first self-dissipation coefficient of the battery.

[0006] In one optional approach, before the step of calculating the ratio of the charging capacity difference to the charging time difference to obtain the first self-dissipation coefficient of the battery, the method further includes: setting a charging level difference based on the initial charge difference; setting a charging level range based on the minimum initial charge value and the charging level difference; obtaining multiple first specific cells based on the multiple initial charge values ​​within the charging level range; obtaining the cell with the minimum charging capacity corresponding to the minimum charging value; determining whether the cell with the minimum charging capacity is one of the multiple first specific cells; if yes, then performing the step of calculating the ratio of the charging capacity difference to the charging time difference to obtain the first self-dissipation coefficient of the battery; if no, then setting the current charging process as the first charging process.

[0007] In one alternative approach, the formula for setting the charging level difference based on the initial charge difference is:

[0008]

[0009] Among them, the The charging level difference, the For the first recharge gap, the These are experience points.

[0010] In one optional approach, the step of calculating the charge amount of the battery cell during the current charging process includes: acquiring charging current data and charging voltage data of the battery cell in real time during the current charging process; calculating the accumulated charge of the battery cell from a first moment to the charging cutoff moment of the current charging process based on the charging current data and charging voltage data, thereby obtaining the charge amount, wherein the first moment is when the voltage of the battery cell reaches a first preset voltage, wherein the first preset voltage is between the discharge cutoff voltage and the charging cutoff voltage.

[0011] According to one aspect of the embodiments of this application, a method for calculating the self-dissipation coefficient of a battery is provided. The battery includes multiple cells. The method includes: calculating the initial discharge amount of each cell in the first discharge process to obtain multiple initial discharge amounts; obtaining the minimum value of the multiple initial discharge amounts to obtain a minimum initial discharge value; obtaining the maximum value of the multiple initial discharge amounts to obtain a maximum initial discharge value; calculating the difference between the maximum and minimum initial discharge values ​​to obtain an initial discharge gap; calculating the discharge amount of each cell in the current discharge process to obtain multiple discharge amounts; obtaining the minimum value of the multiple discharge amounts to obtain a minimum discharge value; obtaining the maximum value of the multiple discharge amounts to obtain a maximum discharge value; calculating the difference between the maximum and minimum discharge values ​​to obtain a discharge gap; calculating the difference between the initial discharge gap and the discharge gap to obtain a discharge amount difference; calculating the difference between the discharge cutoff time of the current discharge process and the discharge cutoff time of the first discharge process to obtain a discharge time difference; and calculating the ratio of the discharge amount difference to the discharge time difference to obtain a second self-dissipation coefficient of the battery.

[0012] In one optional approach, before the step of calculating the ratio of the discharge capacity difference to the discharge time difference to obtain the second self-discharge coefficient of the battery, the method further includes: setting a discharge level difference based on the initial discharge difference; setting a discharge level range based on the minimum initial discharge value and the discharge level difference; obtaining multiple second specific cells based on the multiple initial discharge values, where the initial discharge value is within the discharge level range; obtaining the cell with the maximum discharge capacity corresponding to the maximum discharge value; determining whether the cell with the maximum discharge capacity is one of the multiple second specific cells; if yes, then performing the step of calculating the ratio of the discharge capacity difference to the discharge time difference to obtain the second self-discharge coefficient of the battery; if no, then setting the current discharge process as the first discharge process.

[0013] In one alternative approach, the formula for setting the discharge level difference based on the initial discharge gap is:

[0014]

[0015] Among them, the The discharge level difference, the For the first-release gap, the These are experience points.

[0016] In one optional approach, the step of calculating the discharge capacity of the battery cell during the current discharge process includes: acquiring discharge current data and discharge voltage data of the battery cell in real time during the current discharge process; calculating the discharge capacity of the battery cell from a second moment to the discharge cutoff moment of the current discharge process based on the discharge current data and discharge voltage data, wherein the second moment is when the voltage of the battery cell reaches a second preset voltage, wherein the second preset voltage is between the charging cutoff voltage and the discharging cutoff voltage.

[0017] According to one aspect of the embodiments of this application, a method for detecting battery self-discharge is provided. The method includes: obtaining a first self-discharge coefficient of the battery, wherein the first self-discharge coefficient of the battery is calculated as described in any of the preceding methods; determining whether the first self-discharge coefficient of the battery is greater than a first preset value; or, obtaining a second self-discharge coefficient of the battery, wherein the second self-discharge coefficient of the battery is calculated as described in any of the preceding methods; determining whether the second self-discharge coefficient of the battery is greater than a second preset value; if so, determining that the battery self-discharge is too large.

[0018] In one alternative approach, the ratio of the first self-dissipation coefficient of the battery to the first preset value is calculated to obtain the first self-dissipation rate of the battery; the ratio of the second self-dissipation coefficient of the battery to the second preset value is calculated to obtain the second self-dissipation rate of the battery.

[0019] In one optional approach, when the first self-dissipation coefficient of the battery is greater than the first preset value, it is determined whether the minimum charging capacity cell and the first cell corresponding to the maximum discharge value are the same cell; if yes, it is determined that the self-dissipation of the minimum charging capacity cell is too large; if no, it is determined whether the first self-dissipation ratio is greater than the second self-dissipation ratio; if yes, it is determined that the self-dissipation of the minimum charging capacity cell is too large; if no, it is determined that the self-dissipation of the maximum discharge capacity cell is too large.

[0020] In one optional approach, when the second self-dissipation coefficient of the battery is greater than the second preset value, it is determined whether the battery cell with the maximum discharge capacity is the same battery cell as the second battery cell corresponding to the minimum charge value during the first charge. If yes, it is determined that the self-dissipation of the battery cell with the maximum discharge capacity is too large. If no, it is determined whether the second self-dissipation ratio is greater than the first self-dissipation ratio. If yes, it is determined that the self-dissipation of the battery cell with the maximum discharge capacity is too large. If no, it is determined that the self-dissipation of the battery cell with the minimum charge capacity is too large.

[0021] In one alternative approach, when the self-consumption of the cell with the minimum charge capacity is too high, the first self-consumption ratio is determined as a warning level; when the self-consumption of the cell with the maximum discharge capacity is too high, the second self-consumption ratio is determined as a warning level.

[0022] According to one aspect of the embodiments of this application, a device for calculating the self-dissipation coefficient of a battery is provided. The battery includes multiple battery cells. The device includes: a first calculation module, configured to calculate the initial charge amount of each of the battery cells during the first charging process, thereby obtaining multiple initial charge amounts; a second calculation module, configured to obtain the minimum value of the multiple initial charge amounts, obtain the maximum value of the multiple initial charge amounts, obtain the maximum value of the multiple initial charge amounts, and calculate the difference between the maximum value of the initial charge and the minimum value of the initial charge, thereby obtaining the initial charge difference; and a third calculation module, configured to calculate the charging amount of each of the battery cells during the current charging process, thereby obtaining multiple charging amounts. The system comprises the following modules: a fourth calculation module, used to obtain the minimum value of the plurality of charging quantities, to obtain the minimum charging value; a fifth calculation module, used to obtain the difference between the first charging difference and the charging difference, to obtain the charging quantity difference; a sixth calculation module, used to obtain the difference between the charging cutoff time of the current charging process and the charging cutoff time of the first charging process, to obtain the charging time difference; and a seventh calculation module, used to obtain the ratio of the charging quantity difference to the charging time difference, to obtain the first self-dissipation coefficient of the battery.

[0023] According to one aspect of the embodiments of this application, a device for calculating the self-discharge coefficient of a battery is provided. The battery includes multiple battery cells. The device includes: a first calculation part, configured to calculate the initial discharge amount of each of the battery cells during the first discharge process, thereby obtaining multiple initial discharge amounts; a second calculation part, configured to obtain the minimum value of the multiple initial discharge amounts, thereby obtaining a minimum initial discharge value; obtain the maximum value of the multiple initial discharge amounts, thereby obtaining a maximum initial discharge value; and calculate the difference between the maximum initial discharge value and the minimum initial discharge value, thereby obtaining an initial discharge difference; and a third calculation part, configured to calculate the discharge amount of each of the battery cells during the current discharge process, thereby obtaining multiple discharge amounts. The system comprises the following components: a fourth calculation part, used to obtain the minimum value of the plurality of discharge capacities, to obtain the minimum discharge value; a fifth calculation part, used to obtain the difference between the first discharge gap and the discharge gap, to obtain the discharge capacity difference; a sixth calculation part, used to calculate the difference between the discharge cutoff time of the current discharge process and the discharge cutoff time of the first discharge process, to obtain the discharge time difference; and a seventh calculation part, used to calculate the ratio of the discharge capacity difference to the discharge time difference, to obtain the second self-dissipation coefficient of the battery.

[0024] According to one aspect of the embodiments of this application, a battery self-discharge detection device is provided. The device includes: a third acquisition module, configured to acquire a first self-discharge coefficient or a second self-discharge coefficient of the battery, wherein the first self-discharge coefficient or the second self-discharge coefficient of the battery is calculated as described in any one of the above methods; a second judgment module, configured to determine whether the first self-discharge coefficient of the battery is greater than a first preset value, or to determine whether the second self-discharge coefficient of the battery is greater than a second preset value; if so, then execute a first judgment module; the first judgment module is configured to determine that the battery self-discharge is too large.

[0025] According to one aspect of the present application, a battery is provided, the battery including: at least one processor, and a memory communicatively connected to the at least one processor, the memory storing instructions executable by the at least one processor, the instructions being executed by the at least one processor to enable the at least one processor to perform the method as described above.

[0026] According to one aspect of the embodiments of this application, a computer-readable storage medium is provided, the computer-readable storage medium storing a computer program, which, when executed by a processor, performs the steps of the method described above.

[0027] The beneficial effects of this application include: This application provides a method for calculating the self-dissipation coefficient of a battery, wherein the battery includes multiple cells, and the method includes: calculating the initial charge amount of each cell during the first charging process to obtain multiple initial charge amounts; obtaining the minimum value of the multiple initial charge amounts to obtain the minimum initial charge value, obtaining the maximum value of the multiple initial charge amounts to obtain the maximum initial charge value, and calculating the difference between the maximum and minimum initial charge values ​​to obtain the initial charge gap; calculating the charging amount of each cell during the current charging process to obtain multiple charging amounts; obtaining the minimum value of the multiple charging amounts to obtain the minimum charging value, obtaining the maximum value of the multiple charging amounts to obtain the maximum charging value, and calculating the difference between the maximum and minimum charging values ​​to obtain the charging gap; calculating the difference between the initial charge gap and the charging gap to obtain the charging amount difference; calculating the difference between the charging cutoff time of the current charging process and the charging cutoff time of the first charging process to obtain the charging time difference; and calculating the ratio of the charging amount difference to the charging time difference to obtain the first self-dissipation coefficient of the battery. This method allows for the calculation of the battery's first self-discharge coefficient during the charging process. This means that the battery's self-discharge can be obtained without static testing. Furthermore, the battery's self-discharge can be detected based on the first self-discharge coefficient to ensure its safety, performance stability, and lifespan. Attached Figure Description

[0028] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0029] Figure 1 This is a schematic diagram of the system provided in the embodiments of this application;

[0030] Figure 2 This is a schematic diagram of the hardware structure of the BMS module provided in the embodiments of this application;

[0031] Figure 3 This is a flowchart illustrating the method for calculating the self-dissipation coefficient of a battery provided in an embodiment of this application.

[0032] Figure 4 This is a flowchart illustrating the calculation of the initial charge amount of a battery cell during the first charging process, provided in an embodiment of this application.

[0033] Figure 5 This is a flowchart illustrating the process of calculating the charging capacity of the battery cell during this charging process, provided in an embodiment of this application.

[0034] Figure 6 This is a flowchart illustrating another method for calculating the self-dissipation coefficient of a battery provided in this application embodiment;

[0035] Figure 7 This is a flowchart illustrating another method for calculating the self-dissipation coefficient of a battery provided in this application embodiment;

[0036] Figure 8 This is a flowchart illustrating the calculation of the initial discharge amount of a battery cell during its first discharge, provided in an embodiment of this application.

[0037] Figure 9 This is a flowchart illustrating the process of calculating the discharge capacity of the battery cell during this discharge process, provided in an embodiment of this application.

[0038] Figure 10 This is a flowchart illustrating another method for calculating the self-dissipation coefficient of a battery provided in this application embodiment;

[0039] Figure 11 This is a schematic flowchart of the battery self-discharge detection method provided in the embodiments of this application;

[0040] Figure 12 This is a flowchart illustrating another method for detecting battery self-discharge provided in an embodiment of this application;

[0041] Figure 13This is a flowchart illustrating another method for detecting battery self-discharge provided in the embodiments of this application;

[0042] Figure 14 This is a flowchart illustrating another method for detecting battery self-discharge provided in an embodiment of this application;

[0043] Figure 15 This is a schematic diagram of a device for calculating the self-dissipation coefficient of a battery provided in an embodiment of this application;

[0044] Figure 16 This is a schematic diagram of another battery self-dissipation coefficient calculation device provided in an embodiment of this application;

[0045] Figure 17 This is a schematic diagram of a battery self-discharge detection device provided in an embodiment of this application. Detailed Implementation

[0046] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application. All other embodiments obtained by those skilled in the art based on the embodiments in this application are within the scope of protection of this application.

[0047] Furthermore, the technical features involved in the embodiments of this application described below can be combined with each other as long as they do not conflict with each other.

[0048] Please see Figure 1 , Figure 1 This is a schematic diagram of a system provided in an embodiment of this application. The system is applicable to a method for calculating the self-discharge coefficient of a battery, a method for detecting the self-discharge of a battery, a device for calculating the self-discharge coefficient of a battery, and a device for detecting the self-discharge of a battery. The system includes a battery 100, which includes multiple battery cells 10. In some embodiments, the multiple battery cells 10 are connected in series.

[0049] The battery 100 can be a lithium-ion battery, which mainly includes consumer batteries, power batteries, and energy storage batteries. Consumer batteries typically require small size, light weight, high energy density, and long cycle life, and are widely used in personal electronic devices such as mobile phones, laptops, tablets, digital cameras, and portable music players. Power batteries are mainly used in new energy vehicles, electric bicycles, electric trains, and other transportation vehicles, providing the instantaneous high power output required by the vehicle to support acceleration, hill climbing, and other operations. Energy storage batteries are mostly used in battery energy storage systems for renewable energy sources such as solar, wind, and hydropower, as well as in grid peak shaving and frequency regulation, backup power supplies, and microgrids, primarily for long-term energy storage and stable release.

[0050] It is understood that, in some embodiments, the system further includes a BMS (Battery Management System) module 200. The BMS module 200 is responsible for monitoring the operating status of the battery 100, ensuring its safe and reliable operation. The BMS module 200 can monitor and collect the battery 100's status parameters (including but not limited to voltage, current, temperature, insulation resistance, etc.) in real time, perform necessary analysis and calculations on these parameters to obtain more status assessment parameters, and implement effective management and control of the battery 100 according to specific protection and control strategies, ensuring the safe and reliable operation of the entire battery 100. Simultaneously, the BMS module 200 can interact with other external devices 300 (PCS, EMS, fire suppression systems, etc.) through its own communication interface and analog / digital input interface to form a coordinated control system, ensuring the safe, reliable, and efficient operation of the battery 100.

[0051] To address the technical problem of calculating the self-dissipation coefficient of a battery in the prior art, this application provides a method for calculating the self-dissipation coefficient of a battery.

[0052] Example 1

[0053] Before detailing the method for calculating the charging time, the hardware structure of the BMS module 200 provided in this application embodiment will be described.

[0054] Please see Figure 2 , Figure 2 This is a schematic diagram of the hardware structure of the BMS module 200 provided in this application embodiment, which can execute the method for calculating the self-discharge coefficient of the battery and the method for detecting the self-discharge of the battery. The BMS module 200 includes at least one processor 21 and a memory 22 connected in communication. Figure 2 (Taking a bus connection and a single processor as an example). Those skilled in the art will understand that... Figure 2The structure shown is for illustrative purposes only and does not limit the structure of the battery described above. For example, the BMS module 200 may also include a... Figure 2 The more or fewer components shown, or having the same Figure 2 The different configurations shown.

[0055] The processor 21 is used to provide computing and control capabilities to control the BMS module 200 to execute any of the methods provided in the following embodiments, thereby managing the battery 100 accordingly.

[0056] It is understood that the processor 21 may be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it may also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components.

[0057] The memory 22, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs, non-transitory computer-executable programs, and modules, such as the program instructions / modules corresponding to the various calculation methods in the embodiments of this application. The processor 21, by running the non-transitory software programs, instructions, and modules stored in the memory 22, can implement the various calculation methods in any of the following method embodiments. The memory 22 may include high-speed random access memory and non-transitory memory, such as at least one disk storage device, flash memory device, or other non-transitory solid-state storage device. In some embodiments, the memory 22 may also include memories remotely located relative to the processor, which can be connected to the processor via a network. Examples of such networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.

[0058] Example 2

[0059] This application also provides a non-volatile computer-readable storage medium storing computer-executable instructions that are executed by a battery using various computational methods in any of the following method embodiments.

[0060] This application provides a computer program product, including a computing program stored on a non-volatile computer-readable storage medium. The computer program includes program instructions that, when executed by a computer, cause the computer to perform various computing methods in any of the following method embodiments.

[0061] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented using software and a general-purpose hardware platform, or it can be implemented using hardware. Those skilled in the art will understand that all or part of the processes in the above embodiments can be implemented by a computer program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. The storage medium can be a magnetic disk, optical disk, read-only memory (ROM), or random access memory (RAM), etc.

[0062] Example 3

[0063] The following describes the calculation method of the battery self-dissipation coefficient provided in the embodiments of this application. The battery self-dissipation coefficient is a parameter for detecting the self-dissipation of the battery. That is, the battery self-dissipation can be detected based on the battery self-dissipation coefficient.

[0064] It is worth noting that cell self-discharge, also known as cell self-energy loss, refers to the capacity loss caused by chemical reactions and electron flow within individual cells when the battery is not in use. Cell self-discharge affects cell consistency; cells with inconsistent self-discharge will exhibit significant differences after storage or use for a period of time. Therefore, the self-discharge coefficient and overall self-discharge status of the battery can be deduced from the inconsistency of cells at the end of charging / discharging. Generally, a large difference in inconsistency between cells at the end of charging / discharging results in a large self-discharge coefficient, while a small difference results in a small self-discharge coefficient. Therefore, this application's embodiments calculate the self-discharge coefficient based on the inconsistency of individual cells at the end of charging / discharging, thereby enabling the detection of whether the battery is self-discharging.

[0065] Please see Figure 3 , Figure 3 This is a flowchart illustrating the method for calculating the self-dissipation coefficient of a battery according to an embodiment of this application. Specifically, Figure 3 This is a schematic diagram illustrating the calculation process of the self-dissipation coefficient of a battery during the charging process, provided in an embodiment of this application. The method includes the following steps:

[0066] Step S10: Calculate the initial charge amount of each of the battery cells during the first charging process to obtain multiple initial charge amounts.

[0067] In some embodiments, the first charging process is the process of charging the battery for the first time after it leaves the factory. In some embodiments, the first charging process is not the process of charging the battery for the first time after it leaves the factory, but a charging process modified using a specific charging process, which will be described in detail in step S66 below.

[0068] The initial charge amount refers to the amount of electricity accumulated by the battery at the end of the first charging process. In some embodiments, please refer to... Figure 4 The steps for calculating the initial charge amount of the battery cell during the first charging process include:

[0069] Step S101: Real-time acquisition of the first charging current data and first charging voltage data of the battery cell during the first charging process.

[0070] It is understood that when a battery includes a battery management system (BMS), the BMS can obtain the initial charge current and initial charge voltage data of each cell during the first charging process. Specifically, the BMS is equipped with an AFE (Analog Front End), which is a series of circuits in the electronic system used to process analog signals. In the BMS, the AFE is used to measure battery parameters such as voltage and current with high precision and convert these analog signals into digital signals for further processing and analysis.

[0071] It is worth noting that, due to the inconsistency among the individual cells in the battery, the voltage data of each cell will be inconsistent during charging. That is, it cannot be guaranteed that the voltage of the cells will be consistent at the same time during charging.

[0072] The initial charge current data during the first charge includes: all current data from the start of charging to the end of charging, including the current-time curve during charging. The voltage data during the first charge includes: all voltage data from the start of charging to the end of charging, including the voltage-time curve during charging.

[0073] The charging start time is the time when charging of the battery begins, meaning the charging start time is the same for all the battery cells. The charging stop time is the time when charging of the battery stops, meaning the charging stop time is the same for all the battery cells. In some embodiments, when the voltage of one of the battery cells reaches the charging stop voltage, the charging stop time is reached. At this time, even if the voltage of the other battery cells has not reached the charging stop voltage, charging of the battery is stopped.

[0074] Step S102: Based on the first charging current data and the first charging voltage data, calculate the amount of electricity accumulated by the battery cell from the first time point to the first charging cutoff time of the first charging process, and obtain the first charging amount. The first time point is when the voltage of the battery cell reaches the first preset voltage, and the first preset voltage is between the discharge cutoff voltage and the first charging cutoff voltage.

[0075] The first time point refers to the point at which the voltage of the battery cell reaches a first preset voltage, which is between the discharge cutoff voltage and the charging cutoff voltage. For example, if the voltage range of the battery cell is typically 1.2V-4.2V, then the first preset voltage can be set to 3.8V or 4.0V.

[0076] It is understood that the first preset voltage is a pre-set value.

[0077] It is worth noting that for multiple charge-discharge cycles, such as the first charging cycle, the current charging cycle, and the previous charging cycle, the first preset voltage can be set to the same value.

[0078] It is worth noting that, due to the inconsistency of each of the battery cells, the time when each of the battery cells reaches the first preset voltage may be different, that is, the first time point of each of the battery cells is different.

[0079] The amount of electricity accumulated by the battery cell from the first time point to the charging cutoff time of the first charging process can be calculated using the ampere-hour method. The formula for the initial charge amount is:

[0080]

[0081] Among them, the For the first i The initial charge amount of each of the battery cells from the first time point to the charging end time of the first charging process, the t 2F The charging cutoff time for the first charging process, the t 1Cell（i）F For the first i The first time point of the said battery cell, theI ( t The current during the initial charging process is ) t For time.

[0082] It is understood that in some embodiments, the number of the plurality of initial charge amounts is the same as the number of the battery cells, with one battery cell corresponding to one initial charge amount.

[0083] It is understood that in some embodiments, the number of the plurality of initial charge amounts is less than the number of the battery cells, that is, not every battery cell has the initial charge amount.

[0084] It is worth noting that in some embodiments, the initial charge capacity is the total amount of electricity accumulated by the battery during the first charge, and its calculation method can also be obtained according to the ampere-hour method.

[0085] Step S20: Obtain the minimum value of the plurality of initial charge amounts to obtain the initial charge minimum value; obtain the maximum value of the plurality of initial charge amounts to obtain the initial charge maximum value; calculate the difference between the initial charge maximum value and the initial charge minimum value to obtain the initial charge difference.

[0086] After obtaining multiple initial charge values, the minimum and maximum values ​​among the multiple initial charge values ​​can be obtained by comparison, thus obtaining the minimum initial charge value and the maximum initial charge value. Then, the initial charge difference can be obtained based on the difference between the maximum initial charge value and the minimum initial charge value.

[0087] Step S30: Calculate the charging amount of each of the battery cells during this charging process to obtain multiple charging amounts.

[0088] In some embodiments, the current charging process refers to the current moment (the moment when the battery's self-dissipation coefficient is calculated) and the charging process that the battery cell is currently in.

[0089] Here, the charging capacity refers to the amount of electricity accumulated by the battery at the end of this charging process. In some embodiments, please refer to... Figure 5 The steps for calculating the charging capacity of the battery cell during this charging process include:

[0090] Step S301: Real-time acquisition of charging current data and charging voltage data of the battery cell during this charging process.

[0091] It is understood that when a battery includes a battery management system (BMS), the BMS can obtain the charging current and charging voltage data of each cell during the current charging process. Specifically, the BMS is equipped with an AFE (Analog Front End), which is a series of circuits in the electronic system used to process analog signals. In the BMS, the AFE is used to measure battery parameters such as voltage and current with high precision and convert these analog signals into digital signals for further processing and analysis.

[0092] It is worth noting that, due to the inconsistency among the individual cells in the battery, the voltage data of each cell will be inconsistent during charging. That is, it cannot be guaranteed that the voltage of the cells will be consistent at the same time during charging.

[0093] The charging current data for this charging process includes: all current data from the start time of charging to the end time of charging, including the current-time curve during charging. The voltage data for this charging process includes: all voltage data from the start time of charging to the end time of charging, including the voltage-time curve during charging.

[0094] The charging start time is the time when charging of the battery begins, meaning the charging start time is the same for all the battery cells. The charging stop time is the time when charging of the battery stops, meaning the charging stop time is the same for all the battery cells. In some embodiments, when the voltage of one of the battery cells reaches the charging stop voltage, the charging stop time is reached. At this time, even if the voltage of the other battery cells has not reached the charging stop voltage, charging of the battery is stopped.

[0095] Step S302: Based on the charging current data and charging voltage data, calculate the amount of electricity accumulated by the battery cell from the first moment to the charging cutoff moment of this charging process, and obtain the charging amount. The first moment is when the voltage of the battery cell reaches a first preset voltage, and the first preset voltage is between the discharge cutoff voltage and the charging cutoff voltage.

[0096] The first moment refers to the time when the voltage of the battery cell reaches a first preset voltage, which is between the discharge cutoff voltage and the charging cutoff voltage. For example, if the voltage range of the battery cell is typically 1.2V-4.2V, then the first preset voltage can be set to 3.8V or 4.0V.

[0097] It is understood that the first preset voltage is a pre-set value.

[0098] It is worth noting that for multiple charge-discharge cycles, such as the first charging cycle, the current charging cycle, and the previous charging cycle, the first preset voltage can be set to the same value.

[0099] It is worth noting that, due to the inconsistency of each of the battery cells, the time when each of the battery cells reaches the first preset voltage may be different, that is, the first moment of each of the battery cells is different.

[0100] The amount of charge accumulated by the battery cell from the first moment to the charging cutoff moment of the current charging process can be calculated using the ampere-hour method. The formula for the charging amount is:

[0101]

[0102] Among them, the For the first i The amount of charge generated by the battery cell from the first moment to the end of the current charging process. t 2 is the charging cutoff time for this charging process. t 1Cell（i） For the first i At the first moment of the aforementioned battery cell, the I ( t ) represents the current during this charging process. t For time.

[0103] It is understood that in some embodiments, the number of the plurality of charging capacities is the same as the number of the battery cells, with one battery cell corresponding to one charging capacity.

[0104] It is understood that in some embodiments, the number of the plurality of charging capacities is less than the number of the battery cells, that is, not every battery cell has the charging capacities.

[0105] It is worth noting that in some embodiments, the charging capacity is the total amount of electricity accumulated by the battery during this charging process, and its calculation method can also be obtained according to the ampere-hour method.

[0106] Step S40: Obtain the minimum value of the plurality of charging powers to obtain the minimum charging value; obtain the maximum value of the plurality of charging powers to obtain the maximum charging value; calculate the difference between the maximum charging value and the minimum charging value to obtain the charging gap.

[0107] After obtaining multiple charging amounts, the minimum and maximum values ​​among the multiple charging amounts can be obtained by comparison, thus obtaining the minimum and maximum charging values. Then, the charging difference can be obtained based on the difference between the maximum and minimum charging values.

[0108] Step S50: Calculate the difference between the first charge difference and the charging difference to obtain the charging power difference.

[0109] It is worth noting that the calculated charging power difference is a positive number, that is, the charging power difference is the absolute value of the difference between the initial charging difference and the charging difference.

[0110] Step S60: Calculate the difference between the charging cutoff time of the current charging process and the charging cutoff time of the first charging process to obtain the charging time difference.

[0111] It is worth noting that in some embodiments, the first charge difference is calculated at the charging cutoff time of the first charging process, and the charging difference is calculated at the charging cutoff time of the current charging process. In this case, the charging time difference can also be the difference between the time when the charging difference is calculated and the time when the first charge difference is calculated.

[0112] Step S70: Calculate the ratio of the charging power difference to the charging time difference to obtain the first self-dissipation coefficient of the battery.

[0113] The formula for the first self-dissipation coefficient of the battery is:

[0114]

[0115] Among them, the The first self-dissipation coefficient of the battery, the For the charging power difference, the The charging time difference is mentioned.

[0116] It is understood that if the charging power difference is a positive number, then the first self-dissipation coefficient of the battery, obtained from the ratio of the charging power difference to the charging time difference, is also a positive number.

[0117] In this embodiment, multiple initial charge amounts are obtained by calculating the initial charge amount of each cell during the first charging process; the minimum value of the multiple initial charge amounts is obtained as the initial charge minimum value; the maximum value of the multiple initial charge amounts is obtained as the initial charge maximum value; the difference between the initial charge maximum value and the initial charge minimum value is calculated to obtain the initial charge gap; the charging amount of each cell during the current charging process is calculated to obtain multiple charging amounts; the minimum value of the multiple charging amounts is obtained as the charging minimum value; the maximum value of the multiple charging amounts is obtained as the charging maximum value; the difference between the charging maximum value and the charging minimum value is calculated to obtain the charging gap; the difference between the initial charge gap and the charging gap is calculated to obtain the charging amount difference; the difference between the charging cutoff time of the current charging process and the charging cutoff time of the first charging process is calculated to obtain the charging time difference; the ratio of the charging amount difference and the charging time difference is calculated to obtain the first self-dissipation coefficient of the battery. Therefore, the first self-dissipation coefficient of the battery can be calculated during the charging process, meaning that the self-dissipation status of the battery can be obtained without static testing.

[0118] Example 4

[0119] The following describes another method for calculating the first self-dissipation coefficient of the battery provided in the embodiments of this application. Please refer to [link to relevant documentation]. Figure 6 Another method for calculating the first self-dissipation coefficient of the battery, in addition to steps S10 to S60 and step S70 in the above embodiment three, also includes steps S61 to S66 before step S70:

[0120] Step S61: Set the charging level difference based on the first charge difference.

[0121] In some embodiments, the formula for setting the charging level difference based on the initial charge difference is:

[0122]

[0123] Among them, the The charging level difference, the For the first recharge gap, the These are experience points.

[0124] In some embodiments, the The value obtained based on experience, the The value can be 10, or other specific numbers.

[0125] Step S62: Set the charging level range based on the minimum initial charge value and the charging level difference.

[0126] As an example, the charging level range can be set as follows:

[0127]

[0128] Among them, the The minimum initial charge value, the The charging level difference is mentioned.

[0129] Step S63: Based on the plurality of initial charge amounts, obtain the cells whose initial charge amounts are within the range of the charging level to obtain a plurality of first specific cells.

[0130] Step S64: Obtain the minimum charge capacity of the battery cell corresponding to the minimum charging value.

[0131] Step S65: Determine whether the cell with the minimum charge capacity is one of the plurality of first specific cells. If yes, proceed to step S70; otherwise, proceed to step S66.

[0132] If the cell with the minimum charge capacity is one of the plurality of first specific cells, it means that the comparison of the cell with the minimum charge capacity is comparable and reliable during the calculation of the first self-discharge coefficient of the battery at the current moment (the moment of calculating the self-discharge coefficient of the battery). Then, the step of calculating the first self-discharge coefficient of the battery in step S70 can be executed, thereby improving the accuracy of the calculation of the self-discharge coefficient of the battery and reducing misjudgment and miscalculation.

[0133] Step S66: Set the current charging process as the first charging process.

[0134] If the cell with the minimum charge capacity is not one of the plurality of first specific cells, it means that the comparison of the cell with the minimum charge capacity is not comparable or reliable during the calculation of the first self-dissipation coefficient of the battery at the current moment (the moment of calculating the self-dissipation coefficient of the battery). In this case, the current charging process can be set as the first charging process, that is, the current charging process is updated to the first charging process.

[0135] In some embodiments, after step S66, that is, after updating the current charging process to the first charging process, step S10 is executed, that is, the step of calculating the first charge amount of each of the cells in the first charging process to obtain multiple first charge amounts is performed, and then step S20 is executed.

[0136] In this embodiment, multiple initial charge amounts are obtained by calculating the initial charge amount of each battery cell during the first charging process; the minimum value of the multiple initial charge amounts is obtained as the initial charge minimum value, and the maximum value of the multiple initial charge amounts is obtained as the initial charge maximum value. The difference between the initial charge maximum value and the initial charge minimum value is calculated to obtain the initial charge gap; the charging amount of each battery cell during the current charging process is calculated to obtain multiple charging amounts; the minimum value of the multiple charging amounts is obtained as the charging minimum value, and the maximum value of the multiple charging amounts is obtained as the charging maximum value. The difference between the charging maximum value and the charging minimum value is calculated to obtain the charging gap; the difference between the initial charge gap and the charging gap is calculated to obtain the charging amount difference; the difference between the charging cutoff time of the current charging process and the charging cutoff time of the first charging process is calculated. The process involves: obtaining the charging time difference; setting a charging level difference based on the initial charging difference; setting a charging level range based on the minimum initial charging value and the charging level difference; obtaining multiple first-specific cells based on the multiple initial charging amounts; obtaining the cell with the minimum charging capacity corresponding to the minimum charging value; determining whether the cell with the minimum charging capacity is one of the multiple first-specific cells; if yes, performing the step of calculating the ratio of the charging capacity difference to the charging time difference to obtain the first self-dissipation coefficient of the battery; if no, setting the current charging process as the first charging process, thus allowing the calculation of the battery's first self-dissipation coefficient during the charging process, which eliminates the need for static testing to obtain the battery's self-dissipation status and improves the accuracy of the calculation of the battery's self-dissipation coefficient, reducing misjudgments and miscalculations.

[0137] Example 5

[0138] Please see Figure 7 , Figure 7 This is a flowchart illustrating another method for calculating the self-dissipation coefficient of a battery provided in this application embodiment. Specifically, Figure 7 This is a schematic diagram illustrating the calculation process of the self-discharge coefficient of a battery during the discharge process, provided in an embodiment of this application. The method includes the following steps:

[0139] Step S10': Calculate the initial discharge amount of each of the battery cells during the first discharge process to obtain multiple initial discharge amounts.

[0140] In some embodiments, the first discharge process is the process of discharging the battery for the first time after it leaves the factory. In some embodiments, the first discharge process is not the process of discharging the battery for the first time after it leaves the factory, but a discharge process modified using a specific discharge process, which will be described in detail in step S66' below.

[0141] The initial discharge amount is the amount of electricity released by the battery at the end of its first discharge process. In some embodiments, please refer to... Figure 8 The step of calculating the initial discharge amount of the battery cell during the first discharge process includes:

[0142] Step S101': Real-time acquisition of the first discharge current data and first discharge voltage data of the battery cell during the first discharge process.

[0143] It is understood that when a battery includes a battery management system (BMS), the BMS can obtain the initial discharge current and voltage data of each cell during the initial discharge process. Specifically, the BMS is equipped with an AFE (Analog Front End), which is a series of circuits in the electronic system used to process analog signals. In the BMS, the AFE is used to measure battery parameters such as voltage and current with high precision and convert these analog signals into digital signals for further processing and analysis.

[0144] It is worth noting that, due to the inconsistency among the individual cells in the battery, the voltage data of each cell will be inconsistent during discharge. That is, it cannot be guaranteed that the voltage of the cells will be consistent at the same time during discharge.

[0145] The initial discharge current data during the first discharge process includes: all current data from the start of discharge to the end of discharge, including the current-time curve during discharge. The voltage data during the first discharge process includes: all voltage data from the start of discharge to the end of discharge, including the voltage-time curve during discharge.

[0146] The discharge start time is the moment when the battery begins to discharge, meaning the discharge start time is the same for all the cells. The discharge stop time is the moment when the battery stops discharging, meaning the discharge stop time is the same for all the cells. In some embodiments, when the voltage of one of the cells reaches the discharge stop voltage, the discharge stop time is reached. At this time, even if the voltages of the other cells have not reached the discharge stop voltage, the battery stops discharging.

[0147] Step S102': Based on the first discharge current data and the first discharge voltage data, calculate the amount of electricity discharged by the battery cell from the second time point to the first discharge cutoff time of the first discharge process, and obtain the first discharge amount. The second time point is when the voltage of the battery cell reaches the second preset voltage, and the second preset voltage is between the discharge cutoff voltage and the first discharge cutoff voltage.

[0148] The second time point is when the voltage of the battery cell reaches a second preset voltage, wherein the second preset voltage is between the discharge cutoff voltage and the discharge cutoff voltage.

[0149] In some embodiments, the second preset voltage is between the discharge cutoff voltage and the first preset voltage in Embodiment 3. For example, if the voltage range of the battery cell is typically 1.2V-4.2V, and the first preset voltage can be set to 3.8V or 4.0V, then the second preset voltage can be set to 2.0V.

[0150] It is worth noting that for multiple charge-discharge cycles, such as the first discharge cycle, the current discharge cycle, and the previous discharge cycle, the second preset voltage can be set to the same value.

[0151] It is worth noting that, due to the inconsistency of each of the battery cells, the time when each of the battery cells reaches the second preset voltage may be different, that is, the second time point of each of the battery cells is different.

[0152] The amount of electricity discharged by the battery cell from the second time point to the discharge cutoff time of the first discharge process can be calculated using the ampere-hour method. The formula for the initial discharge amount is:

[0153]

[0154] Among them, the For the first i The initial discharge amount of the battery cell from the second time point to the discharge cutoff time of the first discharge process, the t 3F The discharge cutoff time of the first discharge process, the t 2Cell（i）F For the first i The second time point of the said battery cell, the I ( t ) represents the current during the initial discharge process, the t For time.

[0155] It is understood that in some embodiments, the number of the plurality of first discharge quantities is the same as the number of the battery cells, with one battery cell corresponding to one first discharge quantity.

[0156] It is understood that in some embodiments, the number of the plurality of initial discharge quantities is less than the number of the battery cells, that is, not every battery cell has the initial discharge quantity.

[0157] It is worth noting that in some embodiments, the initial discharge capacity is the total amount of electricity released by the battery during the first discharge, and its calculation method can also be obtained according to the ampere-hour method.

[0158] Step S20': Obtain the minimum value of the plurality of first discharge quantities to obtain the first discharge minimum value; obtain the maximum value of the plurality of first discharge quantities to obtain the first discharge maximum value; calculate the difference between the first discharge maximum value and the first discharge minimum value to obtain the first discharge gap.

[0159] After obtaining multiple initial discharge values, the minimum and maximum values ​​among the multiple initial discharge values ​​can be obtained by comparison, thus obtaining the minimum and maximum initial discharge values. Furthermore, the initial discharge difference can be obtained based on the difference between the maximum and minimum initial discharge values.

[0160] Step S30': Calculate the discharge capacity of each of the battery cells during this discharge process to obtain multiple discharge capacities.

[0161] In some embodiments, the current discharge process refers to the current moment (the moment when the battery's self-dissipation coefficient is calculated) and the discharge process that the battery cell is currently in.

[0162] Here, the discharge capacity is the amount of electricity released by the battery at the end of this discharge process. In some embodiments, please refer to... Figure 9 The steps for calculating the discharge capacity of the battery cell during this discharge process include:

[0163] Step S301': Real-time acquisition of discharge current data and discharge voltage data of the battery cell during this discharge process.

[0164] It is understood that when a battery includes a battery management system (BMS), the BMS can obtain the discharge current and discharge voltage data of each cell during the current discharge process. Specifically, the BMS is equipped with an AFE (Analog Front End), which is a series of circuits in the electronic system used to process analog signals. In the BMS, the AFE is used to measure battery parameters such as voltage and current with high precision and convert these analog signals into digital signals for further processing and analysis.

[0165] It is worth noting that, due to the inconsistency among the individual cells in the battery, the voltage data of each cell will be inconsistent during discharge. That is, it cannot be guaranteed that the voltage of the cells will be consistent at the same time during discharge.

[0166] The discharge current data during this discharge process includes: all current data from the start of discharge to the end of discharge, including the current-time curve during discharge. The voltage data during this discharge process includes: all voltage data from the start of discharge to the end of discharge, including the voltage-time curve during discharge.

[0167] The discharge start time is the moment when the battery begins to discharge, meaning the discharge start time is the same for all the cells. The discharge cutoff time is the moment when the battery stops discharging, meaning the discharge cutoff time is the same for all the cells. In some embodiments, when the voltage of one of the cells reaches the discharge cutoff voltage, the discharge cutoff time is reached. At this time, even if the voltages of the other cells have not reached the discharge cutoff voltage, the battery stops discharging.

[0168] Step S302': Based on the discharge current data and discharge voltage data, calculate the amount of electricity released by the battery cell from the second moment to the discharge cutoff moment of this discharge process, and obtain the discharge amount of electricity. The second moment is when the voltage of the battery cell reaches the second preset voltage, and the second preset voltage is between the discharge cutoff voltage and the discharge cutoff voltage.

[0169] Wherein, the second moment is when the voltage of the battery cell reaches the second preset voltage, wherein the second preset voltage is between the discharge cutoff voltage and the discharge cutoff voltage.

[0170] In some embodiments, the second preset voltage is between the discharge cutoff voltage and the first preset voltage in Embodiment 3. For example, if the voltage range of the battery cell is typically 1.2V-4.2V, and the first preset voltage can be set to 3.8V or 4.0V, then the second preset voltage can be set to 2.0V.

[0171] It is understood that the second preset voltage is a pre-set value.

[0172] It is worth noting that for multiple charge-discharge cycles, such as the first discharge cycle, the current discharge cycle, and the previous discharge cycle, the second preset voltage can be set to the same value.

[0173] It is worth noting that, due to the inconsistency of each of the battery cells, the time when each of the battery cells reaches the second preset voltage may be different, that is, the second time of each of the battery cells is different.

[0174] The amount of electricity discharged by the battery cell from the second moment to the discharge cutoff moment of the current discharge process can be calculated using the ampere-hour method. The formula for the amount of electricity discharged is:

[0175]

[0176] Among them, the For the first i The discharge charge of the battery cell from the second time point to the discharge cutoff time of the current discharge process. t3 represents the discharge cutoff time of this discharge process. t 2Cell（i） For the first i At the second moment of the aforementioned battery cell, the I ( t ) represents the current during this discharge process. t For time.

[0177] It is understood that in some embodiments, the number of the plurality of discharge capacities is the same as the number of the battery cells, with one battery cell corresponding to one discharge capacity.

[0178] It is understood that in some embodiments, the number of the plurality of discharge capacities is less than the number of the battery cells, that is, not every battery cell has the discharge capacities.

[0179] It is worth noting that in some embodiments, the discharge capacity is the total amount of electricity released by the battery during this discharge process, and its calculation method can also be obtained according to the ampere-hour method.

[0180] Step S40': Obtain the minimum value of the plurality of discharge charges to obtain the minimum discharge value; obtain the maximum value of the plurality of discharge charges to obtain the maximum discharge value; calculate the difference between the maximum discharge value and the minimum discharge value to obtain the discharge gap.

[0181] After obtaining multiple discharge capacities, the minimum and maximum values ​​among the multiple discharge capacities can be obtained by comparison, thus obtaining the minimum discharge value and the maximum discharge value. Then, the discharge difference can be obtained based on the difference between the maximum discharge value and the minimum discharge value.

[0182] Step S50': Calculate the difference between the initial discharge difference and the discharge difference to obtain the discharge charge difference.

[0183] It is worth noting that the calculated discharge capacity difference is a positive number, that is, the discharge capacity difference is the absolute value of the difference between the initial discharge difference and the discharge difference.

[0184] Step S60': Calculate the difference between the discharge cutoff time of the current discharge process and the discharge cutoff time of the first discharge process to obtain the discharge time difference.

[0185] It is worth noting that in some embodiments, the first discharge difference is calculated at the discharge cutoff time of the first discharge process, and the discharge difference is calculated at the discharge cutoff time of the current discharge process. In this case, the discharge time difference can also be the difference between the time when the discharge difference is calculated and the time when the first discharge difference is calculated.

[0186] Step S70': Calculate the ratio of the discharge charge difference to the discharge time difference to obtain the second self-dissipation coefficient of the battery.

[0187] The formula for the second self-dissipation coefficient of the battery is:

[0188]

[0189] Among them, the The second self-dissipation coefficient of the battery, the The discharge charge difference, the The discharge time difference is denoted as .

[0190] It is understood that if the discharge capacity difference is a positive number, then the second self-dissipation coefficient of the battery, obtained from the ratio of the discharge capacity difference to the discharge time difference, is also a positive number.

[0191] In this embodiment, multiple initial discharge amounts are obtained by calculating the initial discharge amount of each cell during the first discharge process; the minimum value of the multiple initial discharge amounts is obtained as the minimum initial discharge value, and the maximum value of the multiple initial discharge amounts is obtained as the maximum initial discharge value. The difference between the maximum and minimum initial discharge values ​​is calculated to obtain the initial discharge gap; the discharge capacity of each cell during the current discharge process is calculated to obtain multiple discharge capacities; the minimum value of the multiple discharge capacities is obtained as the minimum discharge value, and the maximum value of the multiple discharge capacities is obtained as the maximum discharge value. The difference between the maximum and minimum discharge values ​​is calculated to obtain the discharge gap; the difference between the initial discharge gap and the discharge gap is calculated to obtain the discharge capacity difference; the difference between the discharge cutoff time of the current discharge process and the discharge cutoff time of the first discharge process is calculated to obtain the discharge time difference; the ratio of the discharge capacity difference to the discharge time difference is calculated to obtain the second self-dissipation coefficient of the battery. Thus, the second self-dissipation coefficient of the battery can be calculated during the discharge process, that is, the self-dissipation status of the battery can be obtained without static testing.

[0192] Example 6

[0193] The following describes another method for calculating the second self-dissipation coefficient of the battery provided in the embodiments of this application. Please refer to [link / reference]. Figure 10 Another method for calculating the second self-dissipation coefficient of the battery, in addition to steps S10' to S60' and step S70' in the above embodiment three, also includes steps S61' to S66' before step S70':

[0194] Step S61': Set the discharge level difference based on the initial discharge difference.

[0195] In some embodiments, the formula for setting the discharge level difference based on the initial discharge difference is:

[0196]

[0197] Among them, the The discharge level difference, the For the first-release gap, the These are experience points.

[0198] In some embodiments, the The value obtained based on experience, the The value can be 10, or other specific numerical values. The value can be the same as in Example 4. The values ​​can be the same or different.

[0199] Step S62': Set the discharge range based on the initial minimum discharge value and the discharge range difference.

[0200] As an example, the discharge range can be set as follows:

[0201]

[0202] Among them, the The minimum value of the first placement, the The discharge level difference is mentioned.

[0203] Step S63': Based on the multiple first discharge quantities, obtain the cells whose first discharge quantities are within the discharge range to obtain multiple second specific cells.

[0204] Step S64': Obtain the cell with the maximum discharged capacity corresponding to the maximum discharge value.

[0205] Step S65': Determine whether the cell with the maximum discharge capacity is one of the plurality of second specific cells. If yes, proceed to step S70'; otherwise, proceed to step S66'.

[0206] If the cell with the maximum discharge capacity is one of the plurality of second specific cells, it means that the comparison of the cell with the maximum discharge capacity is comparable and reliable during the calculation of the second self-discharge coefficient of the battery at the current moment (the moment of calculating the self-discharge coefficient of the battery). Then, the step of calculating the second self-discharge coefficient of the battery in step S70' can be executed, thereby improving the accuracy of the calculation of the self-discharge coefficient of the battery and reducing misjudgment and miscalculation.

[0207] Step S66': Set the current discharge process as the first discharge process.

[0208] If the cell with the maximum discharge capacity is not one of the plurality of second specific cells, it means that the comparison of the cell with the maximum discharge capacity is not comparable or reliable during the calculation of the second self-discharge coefficient of the battery at the current moment (the moment of calculating the self-discharge coefficient of the battery). In this case, the current discharge process can be set as the first discharge process, that is, the current discharge process is updated to the first discharge process.

[0209] In some embodiments, after step S66', that is, after updating the current discharge process to the first discharge process, step S10' is executed, that is, the step of calculating the first discharge amount of each of the cells in the first discharge process to obtain multiple first discharge amounts is performed, and then step S20' is executed.

[0210] In this embodiment, multiple initial discharge quantities are obtained by calculating the initial discharge amount of each cell during the first discharge process; the minimum value of the multiple initial discharge quantities is obtained as the minimum initial discharge value, and the maximum value of the multiple initial discharge quantities is obtained as the maximum initial discharge value; the difference between the maximum and minimum initial discharge values ​​is calculated to obtain the initial discharge gap; the discharge capacity of each cell during this discharge process is calculated to obtain multiple discharge capacities; the minimum value of the multiple discharge capacities is obtained as the minimum discharge value, and the maximum value of the multiple discharge capacities is obtained as the maximum discharge value; the difference between the maximum and minimum discharge values ​​is calculated to obtain the discharge gap; the difference between the initial discharge gap and the discharge gap is calculated to obtain the discharge capacity difference; the difference between the discharge cutoff time of this discharge process and the discharge cutoff time of the first discharge process is calculated. The process involves: obtaining the discharge time difference; setting a discharge level difference based on the initial discharge difference; setting a discharge level range based on the minimum initial discharge value and the discharge level difference; obtaining multiple second specific cells based on the multiple initial discharge values, identifying the cells with initial discharge values ​​within the discharge level range; obtaining the cell with the maximum discharge capacity corresponding to the maximum discharge value; determining whether the cell with the maximum discharge capacity is one of the multiple second specific cells; if yes, performing the step of calculating the ratio of the discharge capacity difference to the discharge time difference to obtain the second self-discharge coefficient of the battery; if no, setting this discharge process as the first discharge process, thus allowing the calculation of the second self-discharge coefficient of the battery during the discharge process, i.e., obtaining the battery's self-discharge status without static testing, and improving the accuracy of the calculation of the battery's self-discharge coefficient, reducing misjudgments and miscalculations.

[0211] Example 7

[0212] The following describes the battery self-discharge detection method provided in the embodiments of this application. Please refer to [link to relevant documentation]. Figure 11 , Figure 11This is a flowchart illustrating a battery self-discharge detection method provided in an embodiment of this application. Specifically, it describes the detection of battery self-discharge during the charging process, and the method includes the following steps:

[0213] Step S1: Obtain the first self-dissipation coefficient of the battery.

[0214] The first self-dissipation coefficient of the battery is calculated as described in Example 3 or Example 4. The calculation method for the first self-dissipation coefficient of the battery can be found in Example 3 or Example 4 above, and will not be repeated here.

[0215] Step S2: Determine whether the first self-dissipation coefficient of the battery is greater than the first preset value. If so, proceed to step S3.

[0216] Here, the first preset value is a preset numerical value. In some embodiments, the first preset value is set based on experience, and different batteries correspond to different first preset values.

[0217] It is worth noting that after obtaining the first self-discharge coefficient of the battery, it is compared with a first preset value. If the first self-discharge coefficient of the battery is greater than the first preset value, it is determined that the battery self-discharge is too large.

[0218] It is worth noting that in some embodiments, if the first self-dissipation coefficient of the battery is not greater than the first preset value, the self-dissipation of the battery is determined to be within the normal range.

[0219] Step S3: Determine that the battery's self-discharge is too high.

[0220] Excessive self-discharge of the battery indicates that the inconsistency among the individual cells in the battery is aggravated.

[0221] In some embodiments, after determining that the battery self-discharge is too high, a prompt or warning may be issued, so that the user can take timely measures to avoid the risk of battery performance degradation or failure caused by excessive self-discharge.

[0222] In this embodiment of the application, by obtaining the first self-dissipation coefficient of the battery, which can be calculated according to the method described in Embodiment 3 or Embodiment 4; it is determined whether the first self-dissipation coefficient of the battery is greater than a first preset value; if so, it is determined that the battery self-dissipation is too large, and it can be determined whether there is a risk to the battery, so that the user can take timely measures to ensure the operational safety and performance stability of the battery.

[0223] Example 8

[0224] The following describes the battery self-discharge detection method provided in the embodiments of this application. Please refer to [link to relevant documentation]. Figure 12 , Figure 12 This is a flowchart illustrating another method for detecting battery self-discharge provided in this application embodiment. Specifically, it describes the detection of battery self-discharge during the discharge process. The method includes the following steps:

[0225] Step S1': Obtain the second self-dissipation coefficient of the battery.

[0226] The second self-dissipation coefficient of the battery is calculated as described in Example 5 or Example 6. The calculation method for the second self-dissipation coefficient of the battery can be found in Example 5 or Example 6 above, and will not be repeated here.

[0227] Step S2': Determine whether the second self-dissipation coefficient of the battery is greater than the second preset value. If so, proceed to step S3'.

[0228] The second preset value is a preset numerical value. In some embodiments, the second preset value is set based on experience, and different batteries correspond to different second preset values.

[0229] It is worth noting that in some embodiments, the second preset value is the same as the first preset value in Embodiment 7.

[0230] It is worth noting that after obtaining the second self-dissipation coefficient of the battery, it is compared with a second preset value. If the second self-dissipation coefficient of the battery is greater than the second preset value, it is determined that the battery self-dissipation is too large.

[0231] It is worth noting that in some embodiments, if the second self-dissipation coefficient of the battery is not greater than the second preset value, it is determined that the battery does not have a risk of self-dissipation.

[0232] Step S3': Determine that the battery's self-discharge is too high.

[0233] Excessive self-discharge of the battery indicates that the inconsistency among the individual cells in the battery is aggravated.

[0234] In some embodiments, after determining that the battery self-discharge is too high, a prompt or warning may be issued, so that the user can take timely measures to avoid the risk of battery performance degradation or failure caused by excessive self-discharge.

[0235] In this embodiment of the application, by obtaining the second self-dissipation coefficient of the battery, which can be calculated according to the method described in Embodiment 5 or Embodiment 6; it is determined whether the second self-dissipation coefficient of the battery is greater than a second preset value; if so, it is determined that the battery self-dissipation is too large, and it can be determined whether the battery has a risk of self-dissipation, so that the user can take timely measures to ensure the operational safety and performance stability of the battery.

[0236] Example 9

[0237] The following describes another method for battery self-discharge provided in the embodiments of this application. Please refer to [link / reference]. Figure 13 The method, after step S3 in Embodiment Seven, or after step S3' in Embodiment Eight, further includes the following steps:

[0238] Step S100: Calculate the ratio of the first self-dissipation coefficient of the battery to the first preset value to obtain the first self-dissipation rate of the battery.

[0239] The first self-dissipation coefficient of the battery is calculated as described in Example 3 or Example 4.

[0240] The first preset value is the same as the first preset value in Embodiment 7. For details, please refer to the description in Embodiment 7, which will not be repeated here.

[0241] The formula for the first self-discharge rate of a battery is:

[0242]

[0243] Among them, the The first self-dissipation rate of the battery, the The first self-dissipation coefficient of the battery, the It is the first preset value.

[0244] Step S200: Calculate the ratio of the second self-dissipation coefficient of the battery to the second preset value to obtain the second self-dissipation rate of the battery.

[0245] The second preset value is the same as the second preset value in Embodiment 8. For details, please refer to the description in Embodiment 8, which will not be repeated here.

[0246] The formula for the second self-discharge rate of a battery is:

[0247]

[0248] Among them, the The second self-dissipation rate of the battery, the The second self-dissipation coefficient of the battery, the It is the second preset value.

[0249] In step S300, when the first self-dissipation coefficient of the battery is greater than the first preset value, it is determined whether the cell with the minimum charging capacity and the first cell corresponding to the first discharge maximum value are the same cell. If yes, then step S400 is executed; if no, then step S500 is executed.

[0250] Among them, the minimum charge capacity of the battery cell corresponds to the minimum charging value, which is calculated as described in Example 3 or Example 4.

[0251] The first maximum value is calculated as described in Example 5 or Example 6.

[0252] If the cell with the minimum charge capacity is the same cell as the first cell, then it is determined that the cell with the minimum charge capacity has excessive self-consumption.

[0253] In some embodiments, if the minimum charge capacity cell is not the same cell as the first cell, then the self-consumption of the minimum charge capacity cell is determined to be within the normal range.

[0254] Step S400: Determine that the self-consumption of the battery cell with the minimum charging capacity is too large.

[0255] It is worth noting that in some embodiments, after determining that the self-discharge of the minimum charge capacity cell is too large, in order to at least facilitate users to take timely measures to ensure the operational safety and performance stability of the battery, the minimum charge capacity cell can be marked by display or warning. Specifically, the first self-discharge rate of the battery is determined as the warning level.

[0256] In some embodiments, if the warning level exceeds the preset warning level, a warning may be issued through display or alarm.

[0257] Step S500: Determine whether the first self-consumption rate is greater than the second self-consumption rate. If yes, proceed to step S400; otherwise, proceed to step S600.

[0258] The first self-consumption rate is obtained according to step S100, and the second self-consumption rate is obtained according to step S200. That is, if the minimum charge capacity cell is not the same cell as the first cell, it can be further determined whether the first self-consumption rate is greater than the second self-consumption rate. If the first self-consumption rate is greater than the second self-consumption rate, step S400 is still executed to determine that the minimum charge capacity cell has excessive self-consumption and to issue a warning. If the first self-consumption rate is less than the second self-consumption rate, step S600 is executed to determine that the maximum discharge capacity cell has excessive self-consumption and to issue a warning.

[0259] Step S600: Determine that the self-consumption of the battery cell with the maximum discharge capacity is too large.

[0260] It is worth noting that in some embodiments, after determining that the self-discharge of the maximum discharge capacity cell is too large, in order to at least facilitate the user to take timely measures to ensure the operational safety and performance stability of the battery, a display or warning method can be adopted to mark that the self-discharge of the maximum discharge capacity cell is too large. Specifically, the second self-discharge rate of the battery is determined as the warning level.

[0261] It is worth noting that the method for determining whether the self-discharge of the cell with the minimum charge capacity is too large or the self-discharge of the cell with the maximum discharge capacity is too large is not limited to the above-described form; other methods may also be used. Please refer to [link / reference needed]. Figure 14 After step S3 in Embodiment Seven, or after step S3' in Embodiment Eight, the system further includes the following steps: S100, S200, S300', S400, S500', and S600, for the purposes of […]. Figure 13 The repeated steps are not described here. Steps S300' and S500' are described as follows:

[0262] In step S300', when the second self-dissipation coefficient of the battery is greater than the second preset value, it is determined whether the cell with the maximum discharge capacity is the same cell as the second cell corresponding to the minimum value of the first charge. If yes, then step S600 is executed; otherwise, step S500' is executed.

[0263] Among them, the cell with the largest discharge capacity corresponds to the maximum discharge value, which is calculated as described in Example 5 or Example 6.

[0264] The minimum initial charge value is calculated as described in Example 3 or Example 4.

[0265] If the cell with the maximum discharge capacity is the same cell as the second cell, then it is determined that the cell with the maximum discharge capacity consumes too much power.

[0266] In some embodiments, if the cell with the maximum discharge capacity is not the same cell as the second cell, then it is determined that the self-discharge of the cell with the maximum discharge capacity is within the normal range.

[0267] Step S500': Determine whether the second self-consumption rate is greater than the first self-consumption rate. If yes, proceed to step S600; otherwise, proceed to step S400.

[0268] The first self-consumption rate is obtained according to step S100, and the second self-consumption rate is obtained according to step S200. That is, if the cell with the maximum discharge capacity is not the same cell as the second cell, it can be further determined whether the second self-consumption rate is greater than the first self-consumption rate. If the second self-consumption rate is greater than the first self-consumption rate, step S600 is still executed to determine that the self-consumption of the cell with the maximum discharge capacity is too large and a warning is issued. If the second self-consumption rate is less than the first self-consumption rate, step S400 is executed to determine that the self-consumption of the cell with the minimum charge capacity is too large and a warning is issued.

[0269] The above steps can further identify which cell has excessive self-discharge, causing the entire battery to have excessive self-discharge.

[0270] To facilitate the reader's understanding of the inventive concept of this application, a specific example is provided below. It is assumed that charging (i.e., charging until the charging cutoff voltage) that satisfies the calculation conditions in Embodiment 3 or Embodiment 4 is completed on days 1, 3, 7, and 17. On day 1, the initial charge difference is calculated. Similarly, the charging difference on days 3, 7, and 17 can be calculated. After charging is completed on the 3rd day, the difference in charging power can be obtained. 3. The first self-consumption coefficient (unit: mAH / day) calculated on the 3rd day is as follows:

[0271]

[0272] For example, the difference in battery power after 17 days. Therefore, the first self-consumption coefficient (in mAH / day) calculated on the 17th day is as follows:

[0273]

[0274] By calculating the first self-discharge coefficient and comparing it with the first preset value, it can be determined whether the battery has excessive self-discharge according to Embodiment Seven. If... If it is larger than the first preset value, then A value greater than 1 indicates excessive self-discharge of the battery, meaning that there are cells in the battery with excessive self-discharge. This suggests that there is a significant difference in self-discharge between certain cells and other cells. The higher the value, the greater the self-discharge of the battery, and a self-discharge warning can be issued.

[0275] For example, One possible value is as follows:

[0276]

[0277] In this embodiment, the first self-dissipation rate of the battery is obtained by calculating the ratio of the first self-dissipation coefficient of the battery to the first preset value; the second self-dissipation rate of the battery is obtained by calculating the ratio of the second self-dissipation coefficient of the battery to the second preset value; when the first self-dissipation coefficient of the battery is greater than the first preset value, it is determined whether the minimum charging capacity cell and the first cell corresponding to the maximum discharge value are the same cell; if yes, it is determined that the self-dissipation of the minimum charging capacity cell is too large; if no, it is determined whether the first self-dissipation rate is greater than the second self-dissipation rate; if yes, it is determined that the self-dissipation of the minimum charging capacity cell is too large; if no, it is determined that the self-dissipation of the maximum discharge capacity cell is too large. This indicates that the difference between the minimum charging capacity cell and other cells exceeds the standard, or the difference between the maximum discharge capacity cell and other cells exceeds the standard. Further warnings can be issued through displays or alarms to allow users to take timely measures to ensure the overall operational safety and stability of the battery.

[0278] Example 10

[0279] The following describes the device for calculating the self-dissipation coefficient of a battery provided in the embodiments of this application. Please refer to [link to relevant documentation]. Figure 15 , Figure 15 This is a schematic diagram of a battery self-dissipation coefficient calculation device provided in an embodiment of this application. The battery self-dissipation coefficient calculation device 1 includes a first calculation module 11, used to calculate the initial charge amount of each of the battery cells during the first charging process, obtaining multiple initial charge amounts; a second calculation module 12, used to obtain the minimum value of the multiple initial charge amounts, obtain the maximum value of the multiple initial charge amounts, obtain the maximum value of the multiple initial charge amounts, calculate the difference between the maximum value of the initial charge and the minimum value of the initial charge, obtaining the initial charge difference; a third calculation module 13, used to calculate the charging amount of each of the battery cells during the current charging process, obtaining multiple charging amounts; a fourth... The calculation module 14 is used to obtain the minimum value of the plurality of charging powers, to obtain the minimum charging value; to obtain the maximum value of the plurality of charging powers, to obtain the maximum charging value; and to calculate the difference between the maximum charging value and the minimum charging value to obtain the charging gap. The fifth calculation module 15 is used to calculate the difference between the first charging gap and the charging gap to obtain the charging power difference. The sixth calculation module 16 is used to calculate the difference between the charging cutoff time of the current charging process and the charging cutoff time of the first charging process to obtain the charging time difference. The seventh calculation module 17 is used to calculate the ratio of the charging power difference to the charging time difference to obtain the first self-dissipation coefficient of the battery.

[0280] In some embodiments, the battery self-dissipation coefficient calculation device 2 further includes a first setting module 161, used to set a charging level difference based on the first charge difference; a second setting module 162, used to set a charging level range based on the first charge minimum value and the charging level difference; a first acquisition module 163, used to acquire the cells whose first charge amount is within the charging level range based on the plurality of first charge amounts, to obtain a plurality of first specific cells; a second acquisition module 164, used to acquire the cell with the minimum charge amount corresponding to the minimum charge value; a first judgment module 165, used to judge whether the cell with the minimum charge amount is one of the plurality of first specific cells, if yes, then proceed to the seventh calculation module 17, if no, then proceed to the third setting module 166; the third setting module 166, used to set the current charging process as the first charging process.

[0281] In some embodiments, the third calculation module 13 includes an acquisition unit 1301, used to acquire in real time the charging current data and charging voltage data of the battery cell during the current charging process; and a calculation unit 1302, used to calculate the amount of electricity accumulated by the battery cell from a first moment to the charging cutoff moment of the current charging process based on the charging current data and charging voltage data, and obtain the charging amount of electricity, wherein the first moment is when the voltage of the battery cell reaches a first preset voltage, wherein the first preset voltage is between the discharge cutoff voltage and the charging cutoff voltage.

[0282] In this embodiment, the first calculation module 11 calculates the initial charge amount of each battery cell during the first charging process, obtaining multiple initial charge amounts; the second calculation module 12 obtains the minimum value of the multiple initial charge amounts, obtaining the minimum initial charge value, and the maximum value of the multiple initial charge amounts, obtaining the maximum initial charge value; the difference between the maximum and minimum initial charge values ​​is calculated to obtain the initial charge difference; the third calculation module 13 calculates the charging amount of each battery cell during the current charging process, obtaining multiple charging amounts; and the fourth calculation module 14 obtains the minimum value of the multiple charging amounts, obtaining the minimum charging value, and thus the multiple charging amounts are calculated. The maximum charging value is obtained by calculating the difference between the maximum charging value and the minimum charging value to obtain the charging gap. The difference between the first charging gap and the charging gap is calculated by the fifth calculation module 15 to obtain the charging power difference. The difference between the charging cutoff time of the current charging process and the charging cutoff time of the first charging process is calculated by the sixth calculation module 16 to obtain the charging time difference. The ratio of the charging power difference to the charging time difference is calculated by the seventh calculation module 17 to obtain the first self-dissipation coefficient of the battery. Thus, the first self-dissipation coefficient of the battery can be calculated during the charging process, that is, the self-dissipation of the battery during the charging process can be obtained without static detection.

[0283] Example 11

[0284] The following describes the battery self-discharge detection device provided in the embodiments of this application. Please refer to [link to relevant documentation]. Figure 16 , Figure 16 This is a schematic diagram of another battery self-discharge coefficient calculation device provided in an embodiment of this application. The other battery self-discharge detection device 2 includes a first calculation part 21, used to calculate the initial discharge amount of each of the battery cells during the first discharge process, obtaining multiple initial discharge amounts; a second calculation part 22, used to obtain the minimum value of the multiple initial discharge amounts, obtain the maximum value of the multiple initial discharge amounts, obtain the maximum value of the multiple initial discharge amounts, and calculate the difference between the maximum value and the minimum value of the initial discharge, obtaining the initial discharge difference; a third calculation part 23, used to calculate the discharge amount of each of the battery cells during this discharge process, obtaining multiple discharge amounts; The fourth calculation part 24 is used to obtain the minimum value of the plurality of discharge quantities, to obtain the minimum discharge value; to obtain the maximum value of the plurality of discharge quantities, to obtain the maximum discharge value; and to calculate the difference between the maximum discharge value and the minimum discharge value to obtain the discharge gap. The fifth calculation part 25 is used to calculate the difference between the initial discharge gap and the discharge gap to obtain the discharge quantity difference. The sixth calculation part 26 is used to calculate the difference between the discharge cutoff time of the current discharge process and the discharge cutoff time of the first discharge process to obtain the discharge time difference. The seventh calculation part 27 is used to calculate the ratio of the discharge quantity difference to the discharge time difference to obtain the second self-dissipation coefficient of the battery.

[0285] In some embodiments, the battery self-dissipation coefficient calculation device 2 further includes a first setting part 261, used to set a discharge level difference based on the first discharge difference; a second setting part 262, used to set a discharge level range based on the first discharge minimum value and the discharge level difference; a first acquisition part 263, used to acquire cells whose first discharge amount is within the discharge level range based on the plurality of first discharge amounts, to obtain a plurality of second specific cells; a second acquisition part 264, used to acquire the cell with the maximum discharge capacity corresponding to the maximum discharge value; a first judgment part 265, used to determine whether the cell with the maximum discharge capacity is one of the plurality of second specific cells, if yes, then proceed to the seventh calculation part 27, if no, then proceed to the third setting part 266; the third setting part 266, used to set the current discharge process as the first discharge process.

[0286] In some embodiments, the third calculation part 23 includes a single-cell acquisition 2302, used to acquire in real time the discharge current data and discharge voltage data of the cell during the current discharge process; and a single-cell calculation 2302, used to calculate the amount of electricity discharged by the cell from a second moment to the discharge cutoff moment of the current discharge process based on the discharge current data and discharge voltage data, to obtain the discharge amount of electricity, wherein the second moment is when the voltage of the cell reaches a second preset voltage, wherein the second preset voltage is between the discharge cutoff voltage and the discharge cutoff voltage.

[0287] In this embodiment, the first calculation part 21 calculates the initial discharge amount of each cell during the first discharge process, obtaining multiple initial discharge amounts; the second calculation part 22 obtains the minimum value of the multiple initial discharge amounts, obtaining the minimum initial discharge value, and the maximum value of the multiple initial discharge amounts, obtaining the maximum initial discharge value; the difference between the maximum and minimum initial discharge values ​​is calculated to obtain the initial discharge difference; the third calculation part 23 calculates the discharge amount of each cell during this discharge process, obtaining multiple discharge amounts; and the fourth calculation part 24 obtains the minimum value of the multiple discharge amounts, obtaining the minimum discharge value, and the difference between the multiple discharge amounts is calculated. The maximum discharge value is obtained by calculating the difference between the maximum discharge value and the minimum discharge value to obtain the discharge gap. The difference between the initial discharge gap and the discharge gap is calculated by the fifth calculation part 25 to obtain the discharge capacity difference. The difference between the discharge cutoff time of the current discharge process and the discharge cutoff time of the first discharge process is calculated by the sixth calculation part 26 to obtain the discharge time difference. The ratio of the discharge capacity difference to the discharge time difference is calculated by the seventh calculation part 27 to obtain the second self-dissipation coefficient of the battery. Thus, the second self-dissipation coefficient of the battery can be calculated during the discharge process, that is, the self-dissipation of the battery during the discharge process can be obtained without static testing.

[0288] Example 12

[0289] The following describes the battery self-discharge detection device provided in the embodiments of this application. Please refer to [link to relevant documentation]. Figure 17 , Figure 17This is a schematic diagram of a battery self-discharge detection device provided in an embodiment of this application. The battery self-discharge detection device 3 includes a third acquisition module 31, used to acquire a first self-discharge coefficient of the battery, which is calculated as described in Embodiment 3 or Embodiment 4, or to acquire a second self-discharge coefficient of the battery, which is calculated as described in Embodiment 5 or Embodiment 6; a second judgment module 32, used to determine whether the first self-discharge coefficient of the battery is greater than a first preset value, and if so, to execute a first judgment module 33; the second judgment module 32 is also used to determine whether the second self-discharge coefficient of the battery is greater than a second preset value, and if so, to execute the first judgment module 33; the first judgment module 33 is used to determine that the battery self-discharge is too large.

[0290] In some embodiments, the battery self-dissipation detection device 3 includes a ninth calculation module 34, used to calculate the ratio of the first self-dissipation coefficient of the battery to the first preset value, to obtain the first self-dissipation rate of the battery; and a tenth calculation module 35, used to calculate the ratio of the second self-dissipation coefficient of the battery to the second preset value, to obtain the second self-dissipation rate of the battery.

[0291] In some embodiments, the battery self-dissipation detection device 3 includes a third judgment module 36, used to determine whether the minimum charging capacity cell and the first cell corresponding to the maximum discharge capacity are the same cell when the first self-dissipation coefficient of the battery is greater than the first preset value; if yes, then execute the second judgment module 37; if no, then execute the fourth judgment module 38; the second judgment module 37 is used to determine that the self-dissipation of the minimum charging capacity cell is too large; the fourth judgment module 38 is used to determine whether the first self-dissipation rate is greater than the second self-dissipation rate; if yes, then execute the second judgment module 37; if no, then execute the third judgment module 39; the third judgment module 39 is used to determine that the self-dissipation of the maximum discharge capacity cell is too large.

[0292] In some embodiments, the battery self-discharge detection device 3 includes a fifth judgment module 40, which is used to determine whether the battery cell with the maximum discharge capacity and the second battery cell corresponding to the minimum value of the first charge are the same battery cell when the second self-discharge coefficient of the battery is greater than the second preset value. If yes, the third judgment module 39 is executed; if no, the sixth judgment module 41 is executed. The sixth judgment module 41 is used to determine whether the second self-discharge rate is greater than the first self-discharge rate. If yes, the third judgment module 39 is executed; if no, the second judgment module 37 is executed.

[0293] In some embodiments, the second determination module 37 is further configured to determine the first self-consumption ratio as a warning level when the self-consumption of the minimum charging capacity cell is too large; the third determination module 39 is further configured to determine the second self-consumption ratio as a warning level when the self-consumption of the maximum discharging capacity cell is too large.

[0294] In this embodiment, the first self-dissipation coefficient of the battery is obtained by the third acquisition module 31, which is calculated as described in Embodiment 3 or Embodiment 4, or is used to obtain the second self-dissipation coefficient of the battery, which is calculated as described in Embodiment 5 or Embodiment 6. The second judgment module 32 determines whether the first self-dissipation coefficient of the battery is greater than a first preset value. If so, the first judgment module 33 is executed. The second judgment module 32 is also used to determine whether the second self-dissipation coefficient of the battery is greater than a second preset value. If so, the first judgment module 33 is executed. If the first judgment module 33 determines that the battery self-dissipation is too high, it can be determined whether there is a risk of self-dissipation of the battery, so that the user can take timely measures to ensure the operational safety and performance stability of the battery.

[0295] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them; under the concept of this application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of this application as described above. For the sake of brevity, they are not provided in detail; although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A method for calculating the self-consumption coefficient of a battery, characterized in that: The battery comprises a plurality of battery cells, and the method comprises: Calculating the first charge capacity of each of the battery cells during the first charge process to obtain multiple first charge capacities; the first charge process includes the process of charging the battery for the first time after the battery leaves the factory, and the first charge capacity is the amount of electricity accumulated by the battery at the end of the first charge process; Obtaining the minimum values ​​of the multiple first charge capacities to obtain a first charge minimum value, obtaining the maximum values ​​of the multiple first charge capacities to obtain a first charge maximum value, and calculating the difference between the first charge maximum value and the first charge minimum value to obtain a first charge difference; Calculating the charging power of each of the battery cells during the current charging process to obtain multiple charging power; the charging power is the power accumulated by the battery at the end of the current charging process; Obtaining minimum values ​​of the multiple charging quantities to obtain a charging minimum value, obtaining maximum values ​​of the multiple charging quantities to obtain a charging maximum value, and calculating a difference between the charging maximum value and the charging minimum value to obtain a charging gap; Calculating the difference between the first charge gap and the charge gap to obtain the charge power difference; Calculating the difference between the charging cut-off time of the current charging process and the charging cut-off time of the first charging process to obtain a charging time difference; The ratio of the charging power difference to the charging time difference is calculated to obtain a first self-consumption power coefficient of the battery.

2. The method according to claim 1, characterized in that Before the step of calculating the ratio of the charging power difference to the charging time difference to obtain the first self-consumption power coefficient of the battery, the method further includes: According to the first charge gap, setting the charging gear difference; According to the first charge minimum value and the charging gear difference, a charging gear range is set; According to the multiple first charge capacities, obtaining battery cells whose first charge capacities are within the charging gear range, to obtain multiple first specific battery cells; Obtain the minimum charging capacity of the battery cell corresponding to the minimum charging value; Determining whether the battery cell with the minimum charge capacity is one of the plurality of first specific battery cells; If yes, then the step of calculating the ratio of the charging power difference to the charging time difference to obtain the first self-consumption power coefficient of the battery is performed; If not, the current charging process is set as the first charging process.

3. The method according to claim 2, characterized in that The formula for setting the charging gear difference according to the first charging gap is: Among them, the ΔQ Chg is the charging gear difference, the Q ChgFirstDiffM is the first charge gap, and A1 is the experience value.

4. The method according to claim 1, characterized in that: The step of calculating the charging amount of the battery cell during this charging process includes: Real-time acquisition of charging current data and charging voltage data of the battery cell during the current charging process; The accumulated amount of electricity of the battery cell from the first moment to the charging cut-off moment of this charging process is calculated according to the charging current data and the charging voltage data to obtain the charging amount, wherein the first moment is when the voltage of the battery cell reaches a first preset voltage, wherein the first preset voltage is between the discharge cut-off voltage and the charge cut-off voltage.

5. A method for calculating the self-consumption coefficient of a battery, characterized in that: The battery comprises a plurality of battery cells, and the method comprises: Calculating the first discharge capacity of each of the battery cells during the first discharge process to obtain a plurality of first discharge capacities, wherein the first discharge process includes the process of first discharge of the battery after the battery leaves the factory; the first discharge capacity is the amount of electricity discharged by the battery at the end of the first discharge process; Obtaining the minimum value of the multiple first discharge amounts to obtain the first discharge minimum value, obtaining the maximum value of the multiple first discharge amounts to obtain the first discharge maximum value, and calculating the difference between the first discharge maximum value and the first discharge minimum value to obtain the first discharge difference; Calculating the discharge amount of each of the battery cells during the current discharge process to obtain multiple discharge amounts; the discharge amount is the amount of electricity discharged by the battery at the end of the current discharge process; Obtaining the minimum value of the multiple discharge quantities to obtain a discharge minimum value, obtaining the maximum value of the multiple discharge quantities to obtain a discharge maximum value, and calculating the difference between the discharge maximum value and the discharge minimum value to obtain a discharge gap; Calculating the difference between the first discharge gap and the discharge gap to obtain the discharge power difference; Calculating the difference between the discharge cut-off time of the current discharge process and the discharge cut-off time of the first discharge process to obtain a discharge time difference; The ratio of the discharge power difference to the discharge time difference is calculated to obtain a second self-consumption power coefficient of the battery.

6. The method according to claim 5, characterized in that Before the step of calculating the ratio of the discharge power difference to the discharge time difference to obtain the second self-consumption power coefficient of the battery, the method further includes: According to the first discharge gap, setting the discharge gear difference; According to the first-discharge minimum value and the discharge gear difference, setting the discharge gear range; According to the multiple first discharge amounts, obtaining battery cells whose first discharge amounts are within the discharge gear range, to obtain multiple second specific battery cells; Obtaining the maximum discharged battery cell corresponding to the maximum discharge value; Determining whether the battery cell with the largest discharged power is one of the plurality of second specific battery cells; If yes, then the step of calculating the ratio of the discharge power difference to the discharge time difference to obtain the second self-consumption power coefficient of the battery is performed; If not, the current discharge process is set as the first discharge process.

7. The method according to claim 6, characterized in that The formula for setting the discharge gear difference according to the first discharge gap is: Among them, the ΔQ Dsg is the discharge gear difference, the Q DsgFirstDiffM is the premiere gap, and A2 is an empirical value.

8. The method according to claim 5, characterized in that The step of calculating the discharge amount of the battery cell during this discharge process includes: Real-time acquisition of discharge current data and discharge voltage data of the battery cell during the current discharge process; According to the discharge current data and the discharge voltage data, the amount of electricity discharged by the battery cell from the second moment to the discharge cut-off moment of this discharge process is calculated to obtain the discharged electricity, wherein the second moment is when the voltage of the battery cell reaches a second preset voltage, wherein the second preset voltage is between the charge cut-off voltage and the discharge cut-off voltage.

9. A method for detecting battery self-consumption, characterized in that: The method comprises: Obtain a first self-consumption power coefficient of the battery, wherein the first self-consumption power coefficient of the battery is calculated according to the method described in any one of claims 1 to 4; determine whether the first self-consumption power coefficient of the battery is greater than a first preset value; Or, obtaining a second self-consumption power coefficient of the battery, wherein the second self-consumption power coefficient of the battery is calculated according to the method described in any one of claims 5 to 8; and determining whether the second self-consumption power coefficient of the battery is greater than a second preset value; If so, it is determined that the battery self-consumption is too large.

10. The method according to claim 9, characterized in that The method comprises: Calculating a ratio of the first self-consumption power coefficient of the battery to the first preset value to obtain a first self-consumption power ratio of the battery; The ratio of the second self-consumption power coefficient of the battery to the second preset value is calculated to obtain the second self-consumption power ratio of the battery.

11. The method according to claim 10, characterized in that The method comprises: When the first self-consumption coefficient of the battery is greater than the first preset value, determining whether the battery cell with the minimum charged power and the first battery cell corresponding to the maximum first-discharge power are the same battery cell; If so, it is determined that the self-consumption of the minimum charged battery cell is too large; If not, it is determined whether the first self-consumption rate is greater than the second self-consumption rate; if so, it is determined that the self-consumption of the minimum charged battery cell is too large; if not, it is determined that the self-consumption of the maximum discharged battery cell is too large.

12. The method according to claim 10, characterized in that The method comprises: When the second self-consumption coefficient of the battery is greater than the second preset value, determining whether the battery cell with the maximum discharged power and the second battery cell corresponding to the first charge minimum value are the same battery cell; If so, it is determined that the self-consumption of the maximum discharge power cell is too large; If not, determine whether the second self-consumption rate is greater than the first self-consumption rate; if so, determine that the self-consumption of the maximum discharged battery cell is too large; if not, determine that the self-consumption of the minimum charged battery cell is too large.

13. The method according to claim 11 or 12, characterized in that: When the self-consumption of the battery cell with the minimum charge amount is too large, determining the first self-consumption ratio as a warning level; When the self-consumption of the battery cell with the maximum discharged power is too large, the second self-consumption ratio is determined as a warning level.

14. A battery, characterized in that: include: at least one processor; as well as A memory, wherein the memory is communicatively connected to the at least one processor, the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the method according to any one of claims 1 to 13.

15. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program. When the computer program is executed by a processor, the processor performs the steps of the method according to any one of claims 1 to 13.

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