Battery cell self-discharge anomaly detection method and device and readable storage medium

Abstract

The invention relates to a battery cell self-discharge abnormity detection method and device and a readable storage medium, and the method comprises the steps: obtaining a first test voltage value of a battery cell in a set test environment at a first time, and a second test voltage value of the battery cell in the set test environment at a second time; wherein the second time is after the first time; according to the first test voltage value and the second test voltage value, obtaining a self-discharge voltage of the battery cell; and comparing the self-discharge voltage with a self-discharge standard voltage, and determining whether self-discharge abnormity exists in the battery cell or not.

Description

Technical Field

[0001] The present disclosure relates to the technical field of battery testing, and more specifically, to a method and device for detecting abnormal self-discharge of a battery, and a readable storage medium. Background Art

[0002] The power battery of a vehicle usually includes a plurality of single cells, which are divided into multiple battery packs, each of which is fixed to the vehicle through an independent battery tray. Each single cell must have good performance consistency to ensure the performance, cycle life and safety of the power battery.

[0003] In the related art, the self-discharge value difference between the single cells in the power battery is often used to determine the battery with inconsistent self-discharge. However, due to the differences in the manufacturing process and technology of different battery trays, the above determination method is prone to misjudgment and missed judgment. Summary of the invention

[0004] An objective of the embodiments of the present disclosure is to provide a new solution for detecting abnormal self-discharge of a battery cell.

[0005] According to a first aspect of the present disclosure, an embodiment of a method for detecting abnormal self-discharge of a battery cell is provided, the method comprising: obtaining a first test voltage value of a battery cell under a set test environment at a first time, and a second test voltage value of the battery cell under the set test environment at a second time; wherein the second time is after the first time;

[0006] Obtaining a self-discharge voltage of the battery cell according to the first test voltage value and the second test voltage value;

[0007] The self-discharge voltage is compared with a self-discharge standard voltage to determine whether the battery cell has self-discharge abnormality.

[0008] Optionally, obtaining a first test voltage value of the battery cell under a set test environment at a first time includes:

[0009] The first test voltage value of the battery cell is obtained according to the tray identifier of the battery tray where the battery cell is located and the cell number of the battery cell; wherein, the multiple battery cells in the battery tray are voltage tested at the first time and under the set test environment, and the first test voltage value of each battery cell is obtained and saved, and each battery cell in the battery tray has its own cell number.

[0010] Optionally, before comparing the self-discharge voltage with the self-discharge standard voltage, the method further includes: determining the self-discharge standard voltage based on the second test voltage value and the first test voltage value of the multiple battery cells in the battery tray where the battery cell is located; wherein, under the set test environment, the multiple battery cells in the battery tray are subjected to voltage tests at the first time and the second time, respectively, to obtain the first test voltage value and the second test voltage value of each battery cell.

[0011] Optionally, determining the self-discharge standard voltage according to the second test voltage values ​​and the first test voltage values ​​of the plurality of battery cells in the battery tray where the battery cell is located includes:

[0012] Determine a first battery cell in the battery tray according to the second test voltage values ​​and the first test voltage values ​​of the plurality of battery cells; wherein the first battery cell is a battery cell for which the voltage difference between the first test voltage value and the second test voltage value is less than or equal to a difference threshold;

[0013] According to the second test voltage value of each of the first battery cells, a voltage mean value and a voltage standard deviation of each of the first battery cells are obtained;

[0014] The self-discharge standard voltage is determined according to the voltage mean and the voltage standard deviation.

[0015] Optionally, determining the self-discharge standard voltage according to the voltage mean and the voltage standard deviation includes:

[0016] When the voltage standard deviation is within a set range, the self-discharge standard voltage is obtained according to the voltage mean and voltage standard deviation of each first battery cell and a self-discharge influencing parameter, wherein the self-discharge influencing parameter includes a physical self-discharge influencing value and a chemical self-discharge influencing value.

[0017] Optionally, the physical self-discharge impact value is a target daily physical self-discharge voltage value of the battery cell determined according to a monthly physical self-discharge voltage value of the battery cell and a target voltage loss rate, and the chemical self-discharge impact value is an impact value of the polarization reaction and side reaction of the battery cell on the voltage.

[0018] Optionally, determining the self-discharge standard voltage according to the voltage mean and the voltage standard deviation includes:

[0019] When the voltage standard deviation is not within the set range, the reference self-discharge standard voltage is used as the self-discharge standard voltage; wherein the reference self-discharge standard voltage is obtained based on the self-discharge voltage test data of all cells in multiple battery trays of the power battery.

[0020] Optionally, comparing the self-discharge voltage with a self-discharge standard voltage to determine whether the battery cell has a self-discharge abnormality includes:

[0021] When the self-discharge voltage is greater than the self-discharge standard voltage, it is determined that the self-discharge of the battery cell is abnormal.

[0022] According to a second aspect of the present disclosure, an embodiment of an electronic device is provided, the electronic device comprising: a memory and a processor, the memory storing executable instructions, the instructions being used to control the processor to operate to execute the battery cell self-discharge abnormality detection method according to the first aspect

[0023] According to a third aspect of the present disclosure, an embodiment of a readable storage medium is provided, storing a computer program, which, when executed by a processor, implements the method for detecting abnormal self-discharge of a battery cell as described in the first aspect.

[0024] One beneficial effect of the disclosed embodiment is that, by obtaining the first test voltage value of the battery cell under the set test environment at the first time, and the second test voltage value of the battery cell under the set test environment at the second time; wherein the second time is after the first time; according to the first test voltage value and the second test voltage value, the self-discharge voltage of the battery cell is obtained; and the self-discharge voltage is compared with the self-discharge standard voltage to determine whether the battery cell has self-discharge abnormality. By judging whether the battery cell has self-discharge abnormality according to the self-discharge standard voltage, the accuracy of self-discharge abnormality judgment is improved, and the misjudgment and missed judgment that exist in the related art when determining the inconsistency of battery self-discharge through the voltage difference between single cells is avoided.

[0025] Further features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

[0027] Figure 1 is a principle block diagram of a hardware configuration of an exemplary electronic device;

[0028] Figure 2 is a flow chart of a method for detecting abnormal self-discharge of a battery cell according to an embodiment;

[0029] Figure 3 is a flow chart of a method for detecting abnormal self-discharge of a battery cell according to another embodiment;

[0030] Figure 4It is a schematic diagram of the hardware structure of an exemplary electronic device. DETAILED DESCRIPTION

[0031] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention unless otherwise specifically stated.

[0032] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

[0033] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0034] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0035] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0036] <Hardware Configuration>

[0037] like Figure 1 As shown, the electronic device 1000 to which the battery cell self-discharge abnormality detection method disclosed in the present invention can be applied may include a processor 1100 , a memory 1200 , a communication device 1300 , a display device 1400 , an input device 1500 , and the like.

[0038] The processor 1100 may be a mobile version processor. The memory 1200 may include, for example, a ROM (read-only memory), a RAM (random access memory), a non-volatile memory such as a hard disk, etc. The communication device 1300 may, for example, be capable of wired or wireless communication. The communication device 1300 may include a short-range communication device, for example, any device for short-range wireless communication based on short-range wireless communication protocols such as Hilink protocol, WiFi (IEEE 802.11 protocol), Mesh, Bluetooth, ZigBee, Thread, Z-Wave, NFC, UWB, LiFi, etc. The communication device 1300 may also include a remote communication device, for example, any device for WLAN, GPRS, 2G / 3G / 4G / 5G remote communication. The display device 1400 may, for example, be a liquid crystal display, a touch display, etc. The input device 1500 may, for example, include a touch screen, a keyboard, etc.

[0039] In this embodiment, the memory 1200 of the electronic device 1000 is used to store instructions, and the instructions are used to control the processor 1100 to operate to implement the battery cell self-discharge abnormality detection method. The technician can design instructions according to the scheme disclosed in the present disclosure. How the instructions control the processor to operate is well known in the art, so it will not be described in detail here.

[0040] Despite Figure 1 Multiple devices of the electronic device 1000 are shown in the figure, but the present disclosure may only involve some of the devices, for example, the terminal device 1000 only involves the memory 1200 and the processor 1100, the communication device 1300 and the display device 1400.

[0041] It should be understood that although Figure 1 Only one electronic device 1000 is shown, but this does not mean to limit the number of electronic devices 1000 .

[0042] <Method Example>

[0043] Figure 2 It is a flow chart of a method for detecting abnormal self-discharge of a battery cell according to an embodiment of the present disclosure.

[0044] like Figure 2 As shown, the battery self-discharge abnormality detection method of this embodiment can be specifically performed as follows Figure 1 The electronic device 1000 shown performs.

[0045] Specifically, the battery cell self-discharge abnormality detection method of this embodiment may include the following steps S2100 to S2300:

[0046] Step S2100, obtaining a first test voltage value of the battery cell under a set test environment at a first time, and a second test voltage value of the battery cell under the set test environment at a second time.

[0047] In this embodiment, setting the test environment may include setting temperature, humidity, etc. For example, setting the test temperature to 25.5 degrees, which is not limited here.

[0048] Under a set test environment, a voltage test may be performed on a single battery cell, or on multiple batteries in a battery tray of a power battery, or on all batteries of the power battery, without limitation here.

[0049] In the voltage test, a first test voltage value of the battery cell at a first time and a second test voltage value at a second time are recorded respectively, wherein the second time is after the first time.

[0050] In some embodiments, obtaining a first test voltage value of the battery cell under a set test environment at a first time in step S2100 includes: step S3100.

[0051] Step S3100, obtaining the first test voltage value of the battery cell according to the tray identifier of the battery tray where the battery cell is located and the cell number of the battery cell; wherein, the multiple battery cells in the battery tray are voltage tested at the first time and under the set test environment, and the first test voltage value of each battery cell is obtained and saved, and each battery cell in the battery tray has its own cell number.

[0052] In this embodiment, the power battery includes multiple battery trays, each battery tray has a unique tray identifier, and each battery tray contains multiple battery cells, each of which has its own battery cell number. A voltage test can be performed on multiple battery cells in a battery tray under a set test environment to obtain a first test voltage value of the multiple battery cells at the first time and save it.

[0053] When it is necessary to perform self-discharge abnormality detection on a battery cell in the battery tray, the first test voltage value of the battery cell can be acquired according to the tray identification of the battery tray where the battery cell is located and the battery cell number of the battery cell.

[0054] Step S2200: obtaining the self-discharge voltage of the battery cell according to the first test voltage value and the second test voltage value.

[0055] In this embodiment, the battery cell will produce a voltage drop during the self-discharge process, that is, when the second time is later than the first time, the first test voltage value corresponding to the first time is greater than the second test voltage value corresponding to the second time. The self-discharge voltage of the battery cell can be obtained according to the difference between the first test voltage value and the second test voltage value of the battery cell.

[0056] For example, the first test voltage value V1 of a certain battery cell is 3284.469 mV, and the second test voltage value V2 is 3282.9 mV, then the self-discharge voltage SD of the battery cell is V1-V2=1.569 mV.

[0057] Step S2300, comparing the self-discharge voltage with a self-discharge standard voltage to determine whether the battery cell has self-discharge abnormality.

[0058] For example, if the self-discharge standard voltage is 2.5mV, if the self-discharge voltage SD of the battery cell is 1.569mV, that is, the self-discharge voltage of the battery cell is less than the self-discharge standard voltage, then it is determined that the battery cell does not have self-discharge anomaly. If the self-discharge voltage SD of the battery cell is 5.539mV, that is, the self-discharge voltage of the battery cell is greater than the self-discharge standard voltage, then it is determined that the battery cell has self-discharge anomaly.

[0059] In this embodiment, the self-discharge standard voltage can be obtained based on the leakage current experiment and long-term voltage test data of all battery cells in each battery tray of the power battery. The self-discharge standard voltage can also be obtained based on the first test voltage value and the second test voltage value of multiple battery cells in the battery tray where the battery cells are located, which is not limited here.

[0060] In some embodiments, before comparing the self-discharge voltage with the self-discharge standard voltage in step S2300, the method further includes: step S4100.

[0061] Step S4100, determining the self-discharge standard voltage according to the second test voltage value and the first test voltage value of the multiple battery cells in the battery tray where the battery cell is located; wherein, under the set test environment, the multiple battery cells in the battery tray are subjected to voltage tests at the first time and the second time, respectively, to obtain the first test voltage value and the second test voltage value of each battery cell.

[0062] In this embodiment, the self-discharge standard voltage can be obtained according to the first test voltage value and the second test voltage value of the plurality of cells in the battery tray where the cells are located, that is, the self-discharge standard voltage is the self-discharge standard voltage of the battery tray where the cells are located.

[0063] Specifically, a voltage test can be first performed on each battery cell in the battery tray where the battery cell is located under a set test environment to obtain a first test voltage value of the multiple battery cells at the first time and a second test voltage value at the second time. Then, the first test voltage value and the second test voltage value of the multiple battery cells are obtained, and the second test voltage value and the first test voltage value are judged. If any one of the second test voltage value and the first test voltage value is zero, it is determined that the voltage test equipment of the battery cell corresponding to the zero voltage value is faulty, and the first test voltage value and the second test voltage value corresponding to the battery cell are removed. Then, the self-discharge standard voltage is obtained based on the remaining first test voltage value and the second test voltage value in the battery tray.

[0064] In some embodiments, the self-discharge standard voltage is determined according to the second test voltage values ​​and the first test voltage values ​​of the plurality of battery cells in the battery tray where the battery cell is located in step S4100, including: steps S4101 to S4103.

[0065] Step S4101: determining a first battery cell in the battery tray according to the second test voltage values ​​and the first test voltage value of the plurality of battery cells.

[0066] In this embodiment, the battery tray contains multiple battery cells. After obtaining the first test voltage value and the second test voltage value corresponding to each battery cell in the battery tray, the first battery cell in the battery tray is determined according to the difference between the first test voltage value and the second test voltage value corresponding to each battery cell. When the voltage difference between the first test voltage value and the second test voltage value of the battery cell is less than or equal to the difference threshold, the battery cell is determined to be the first battery cell.

[0067] For example, a battery tray includes 60 cells, and a voltage test can be performed on the 60 cells under a set test environment to obtain a first test voltage value of each cell at a first time and a second test voltage value at a second time, and the first cell among the 60 cells is determined according to the screening condition that the voltage difference between the first test voltage value and the second test voltage value is less than or equal to the difference threshold. For example, it is determined that the number of first cells among the 60 cells is 40.

[0068] In some embodiments, after determining the first battery cell in the battery tray in step S4101, the method further includes:

[0069] Output the number of first battery cells in the battery tray.

[0070] Continuing with the above example, after determining that the number of the first battery cells is 40, the number of the first battery cells 40 may be output to the tester so that the tester can perform corresponding battery optimization processing according to the number.

[0071] Step S4102: Obtain a voltage mean and a voltage standard deviation of the first battery cells according to the second test voltage value of each of the first battery cells.

[0072] In this embodiment, after determining the first battery cell in the battery tray, the corresponding second test voltage value can be obtained according to the battery cell number of the first battery cell. According to the second test voltage value of each first battery cell, the voltage mean and voltage standard deviation of the first battery cell are obtained.

[0073] Step S4103, determining the self-discharge standard voltage according to the voltage mean and the voltage standard deviation.

[0074] In some embodiments, determining the self-discharge standard voltage according to the voltage mean and the voltage standard deviation in step S4103 includes:

[0075] When the voltage standard deviation is within a set range, the self-discharge standard voltage is obtained according to the voltage mean and voltage standard deviation of each first battery cell and a self-discharge influencing parameter, wherein the self-discharge influencing parameter includes a physical self-discharge influencing value and a chemical self-discharge influencing value.

[0076] In this embodiment, the setting range may be set by a tester based on historical voltage test data of a plurality of battery cells that meet battery production requirements.

[0077] When the voltage standard deviation is within the set range, it means that the self-discharge standard voltage of the battery tray can be used to determine whether the battery cell has self-discharge abnormality. At this time, the self-discharge standard voltage of the battery tray is obtained according to the voltage mean and voltage standard deviation of the first battery cell and the self-discharge influencing parameter. The self-discharge influencing parameter includes a physical self-discharge influencing value and a chemical self-discharge influencing value.

[0078] The formula (1) for calculating the self-discharge standard voltage is as follows:

[0079] B=K+XN*σ, (1)

[0080] Wherein, B is the self-discharge standard voltage of the battery tray, K is the physical self-discharge influence value, N is the chemical self-discharge influence value, σ is the voltage standard deviation of the first battery cell, and X is the voltage mean of the first battery cell.

[0081] In some embodiments, the physical self-discharge impact value is a target daily loss voltage value of the physical self-discharge of the battery cell determined based on the monthly loss voltage value of the physical self-discharge of the battery cell and the target voltage loss rate, and the chemical self-discharge impact value is the impact value of the polarization reaction and side reaction of the battery cell on the voltage.

[0082] In one example, the normal physical self-discharge monthly loss voltage value of the battery cell is 5 mV, and the target voltage loss rate is 2%. Therefore, the physical self-discharge target daily loss voltage value of the battery cell is K=10*2% / 30=0.33.

[0083] The chemical self-discharge impact value may be an impact value of the polarization reaction and side reaction of the battery cell on the voltage.

[0084] In one example, the chemical self-discharge impact value may be expressed as a fluctuation in the self-discharge voltage of the battery cell, that is, a voltage standard deviation of the self-discharge voltage of the battery cell. For example, N=3.35.

[0085] In some embodiments, determining the self-discharge standard voltage according to the voltage mean and the voltage standard deviation in step S4103 includes:

[0086] When the voltage standard deviation is not within the set range, the reference self-discharge standard voltage is used as the self-discharge standard voltage; wherein the reference self-discharge standard voltage is obtained based on the self-discharge voltage test data of all cells in multiple battery trays of the power battery.

[0087] In this embodiment, when the voltage standard deviation of the first battery cell is not within the set range, it means that there is a large deviation in detecting the self-discharge abnormality of the battery cell by using the self-discharge standard voltage of the battery tray. At this time, the reference self-discharge standard voltage can be used to detect whether there is any self-discharge abnormality of the battery cell in the battery tray.

[0088] The reference self-discharge standard voltage can be applied to the self-discharge abnormality detection of the cells in all battery trays of the power battery. The reference self-discharge standard can be obtained based on the self-discharge voltage test data distribution of all cells in multiple battery trays of the power battery.

[0089] In one example, the reference self-discharge standard B0 can be expressed by the following formula (2):

[0090] B0=XBar+K-3.35σ0, (2)

[0091] Wherein, XBar is the voltage mean of the self-discharge voltage test of all cells in the power battery, and σ0 is the voltage standard deviation of the self-discharge voltage test of all cells in the power battery.

[0092] After obtaining the reference self-discharge standard voltage through formula (2), leakage current test and long-term self-discharge voltage test can be performed to verify whether the reference self-discharge standard voltage meets the use requirements. When it is determined that the reference self-discharge standard voltage meets the use requirements, the reference self-discharge standard voltage is used to detect the self-discharge anomaly of the battery cell.

[0093] In some embodiments, comparing the self-discharge voltage with the self-discharge standard voltage in step S2300 to determine whether the battery cell has a self-discharge abnormality includes:

[0094] When the self-discharge voltage is greater than the self-discharge standard voltage, it is determined that the self-discharge of the battery cell is abnormal.

[0095] When the self-discharge voltage is less than or equal to the self-discharge standard voltage, it is determined that the self-discharge of the battery cell is normal.

[0096] According to the method of the embodiment of the present application, the following effects can be achieved:

[0097] First, judging whether the battery cell has self-discharge anomaly based on the self-discharge standard voltage avoids the misjudgment and missed judgment that exist when the battery self-discharge inconsistency is determined by the voltage difference between single cells in the related technology, and improves the accuracy of self-discharge anomaly detection.

[0098] Second, by determining the self-discharge standard voltage based on the voltage mean and voltage standard deviation of the first battery cell in the battery tray and the self-discharge influencing parameters, it is possible to detect whether the battery cell has self-discharge abnormality through the self-discharge standard voltage of the battery tray where the battery cell is located. That is, self-discharge abnormality detection can be performed based on the small units of the battery tray. Compared with performing self-discharge abnormality detection based on the reference self-discharge standard voltage of all battery cells in multiple battery trays of the power battery, it can avoid the impact of differences in process, temperature, etc. among different battery trays in the power battery on the detection accuracy, thereby further improving the accuracy of self-discharge abnormality detection.

[0099] <Example>

[0100] Figure 3 is a flow chart of a method for detecting abnormal self-discharge of a battery cell according to another embodiment of the present application. Figure 3 As shown, the method includes: step S1 to step S12.

[0101] Step S1, obtaining a second test voltage value of a plurality of battery cells in a battery tray under a set test environment at a second time.

[0102] In this embodiment, each battery cell in the battery tray is subjected to voltage testing simultaneously to ensure that each battery cell is in the same test environment. After the voltage test is completed, a second test voltage value of the plurality of battery cells in the battery tray in the set test environment at a second time is obtained.

[0103] Step S2, obtaining, according to the tray identification of the battery tray and the cell numbers of the battery cells, a first test voltage value of the plurality of battery cells under a set test environment at a first time.

[0104] In this embodiment, the first time is before the second time. The first test voltage values ​​of the plurality of cells at the first time are stored in the database, and after the second test voltage values ​​of the plurality of cells in the battery tray at the second time are obtained, the first test voltage values ​​of the plurality of cells at the first time can be obtained according to the tray identification of the battery tray and the cell number of the cell.

[0105] Step S3, obtaining the self-discharge voltage of the battery cell according to the first test voltage value and the second test voltage value.

[0106] Step S4, whether the self-discharge voltage is less than or equal to the difference threshold; if so, execute step S5, if not, execute step S12.

[0107] Step S5, determining that the battery cell is the first battery cell.

[0108] Step S6, obtaining a voltage mean and a voltage standard deviation of the first battery cell according to the second test voltage value of each first battery cell.

[0109] Step S7, whether the standard deviation is within the set range; if so, execute step S8, if not, execute step S9.

[0110] Step S8, obtaining the self-discharge standard voltage according to the voltage mean value and voltage standard deviation of the first battery cell and the self-discharge influencing parameter.

[0111] In this embodiment, the self-discharge influencing parameters include a physical self-discharge influencing value and a chemical self-discharge influencing value.

[0112] Step S9: using the reference self-discharge standard voltage as the self-discharge standard voltage.

[0113] Step S10, whether the self-discharge voltage is greater than the self-discharge standard voltage; if so, execute step S11, if not, execute step S12.

[0114] Step S11, determining that the battery cell self-discharge is abnormal.

[0115] Step S12, determining that the self-discharge of the battery cell is normal.

[0116] <Electronic Equipment Embodiment>

[0117] In this embodiment, an electronic device 4000 is also provided.

[0118] like Figure 4 As shown, the electronic device 4000 may include a processor 4100 and a memory 4200, wherein the memory 4200 is used to store executable instructions; the processor 4100 is used to control the electronic device 4000 to execute the above-mentioned Figure 2 or Figure 3 The method for detecting abnormal self-discharge of a battery cell in the embodiment described above.

[0119] In one embodiment, the electronic device 4000 may be a vehicle.

[0120] <Medium Example>

[0121] An embodiment of the present disclosure provides a readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the method for detecting abnormal self-discharge of a battery cell provided in any of the aforementioned embodiments is implemented.

[0122] The present invention may be a system, a method and / or a computer program product. The computer program product may include a computer-readable storage medium carrying computer-readable program instructions for causing a processor to implement various aspects of the present invention.

[0123] A computer-readable storage medium may be a tangible device that can hold and store instructions used by an instruction execution device. A computer-readable storage medium may be, for example, but not limited to, an electrical storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any suitable combination of the foregoing. More specific examples of computer-readable storage media (a non-exhaustive list) include: a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), a static random access memory (SRAM), a portable compact disk read-only memory (CD-ROM), a digital versatile disk (DVD), a memory stick, a floppy disk, a mechanical encoding device, such as a punch card or a raised structure in a groove on which instructions are stored, and any suitable combination of the foregoing. As used herein, a computer-readable storage medium is not to be interpreted as a transient signal per se, such as a radio wave or other freely propagating electromagnetic wave, an electromagnetic wave propagating through a waveguide or other transmission medium (e.g., a light pulse through a fiber optic cable), or an electrical signal transmitted through a wire.

[0124] The computer-readable program instructions described herein can be downloaded from a computer-readable storage medium to each computing / processing device, or downloaded to an external computer or external storage device via a network, such as the Internet, a local area network, a wide area network, and / or a wireless network. The network can include copper transmission cables, optical fiber transmissions, wireless transmissions, routers, firewalls, switches, gateway computers, and / or edge servers. The network adapter card or network interface in each computing / processing device receives the computer-readable program instructions from the network and forwards the computer-readable program instructions for storage in the computer-readable storage medium in each computing / processing device.

[0125] The computer program instructions for performing the operation of the present invention may be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-related instructions, microcode, firmware instructions, state setting data, or source code or object code written in any combination of one or more programming languages, including object-oriented programming languages, such as Smalltalk, C++, etc., and conventional procedural programming languages, such as "C" language or similar programming languages. Computer-readable program instructions may be executed entirely on a user's computer, partially on a user's computer, as an independent software package, partially on a user's computer, partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer via any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., using an Internet service provider to connect via the Internet). In some embodiments, an electronic circuit, such as a programmable logic circuit, a field programmable gate array (FPGA), or a programmable logic array (PLA), may be personalized by utilizing the state information of the computer-readable program instructions, and the electronic circuit may execute the computer-readable program instructions, thereby realizing various aspects of the present invention.

[0126] Various aspects of the present invention are described herein with reference to the flow charts and / or block diagrams of the methods, devices (systems) and computer program products according to embodiments of the present invention. It should be understood that each box of the flow chart and / or block diagram and the combination of each box in the flow chart and / or block diagram can be implemented by computer-readable program instructions.

[0127] These computer-readable program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, thereby producing a machine, so that when these instructions are executed by the processor of the computer or other programmable data processing device, a device that implements the functions / actions specified in one or more boxes in the flowchart and / or block diagram is generated. These computer-readable program instructions can also be stored in a computer-readable storage medium, and these instructions cause the computer, programmable data processing device, and / or other equipment to work in a specific manner, so that the computer-readable medium storing the instructions includes a manufactured product, which includes instructions for implementing various aspects of the functions / actions specified in one or more boxes in the flowchart and / or block diagram.

[0128] Computer-readable program instructions may also be loaded onto a computer, other programmable data processing apparatus, or other device so that a series of operating steps are performed on the computer, other programmable data processing apparatus, or other device to produce a computer-implemented process, thereby causing the instructions executed on the computer, other programmable data processing apparatus, or other device to implement the functions / actions specified in one or more boxes in the flowchart and / or block diagram.

[0129] The flow charts and block diagrams in the accompanying drawings show the possible architecture, functions and operations of the systems, methods and computer program products according to multiple embodiments of the present invention. In this regard, each box in the flow chart or block diagram can represent a part of a module, a program segment or an instruction, and a part of the module, a program segment or an instruction contains one or more executable instructions for realizing the specified logical function. In some alternative implementations, the functions marked in the box can also occur in a different order from the order marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or flow chart, and the combination of the boxes in the block diagram and / or flow chart can be implemented by a dedicated hardware-based system that performs the specified function or action, or can be implemented by a combination of dedicated hardware and computer instructions. It is well known to those skilled in the art that it is equivalent to implement it by hardware, implement it by software, and implement it by combining software and hardware.

[0130] Embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The choice of terms used herein is intended to best explain the principles of the embodiments, practical applications, or technical improvements to the technology in the marketplace, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein. The scope of the present invention is defined by the appended claims.

Claims

1. A method for detecting abnormal self-discharge of a battery cell, characterized in that: The method comprises: Obtaining a first test voltage value of a battery cell under a set test environment at a first time, and a second test voltage value of the battery cell under the set test environment at a second time; wherein the second time is after the first time; Obtaining a self-discharge voltage of the battery cell according to the first test voltage value and the second test voltage value; The self-discharge voltage is compared with a self-discharge standard voltage to determine whether the battery cell has self-discharge abnormality.

2. The method according to claim 1, characterized in that The obtaining of a first test voltage value of the battery cell under a set test environment at a first time includes: Acquire the first test voltage value of the battery cell according to the tray identifier of the battery tray where the battery cell is located and the battery cell number of the battery cell; The plurality of cells in the battery tray are subjected to voltage testing under the first time and the set test environment to obtain a first test voltage value of each cell and save the obtained value. Each cell in the battery tray has its own cell number.

3. The method according to claim 1, characterized in that Before comparing the self-discharge voltage with the self-discharge standard voltage, the method further includes: Determining the self-discharge standard voltage according to the second test voltage values ​​and the first test voltage values ​​of the plurality of battery cells in the battery tray where the battery cell is located; Wherein, under the set test environment, the plurality of battery cells in the battery tray are subjected to voltage tests at the first time and the second time, respectively, to obtain a first test voltage value and a second test voltage value of each battery cell.

4. The method according to claim 3, characterized in that The determining the self-discharge standard voltage according to the second test voltage value and the first test voltage value of the plurality of battery cells in the battery tray where the battery cell is located comprises: Determine a first battery cell in the battery tray according to the second test voltage values ​​and the first test voltage values ​​of the plurality of battery cells; wherein the first battery cell is a battery cell for which the voltage difference between the first test voltage value and the second test voltage value is less than or equal to a difference threshold; According to the second test voltage value of each of the first battery cells, a voltage mean value and a voltage standard deviation of each of the first battery cells are obtained; The self-discharge standard voltage is determined according to the voltage mean and the voltage standard deviation.

5. The method according to claim 4, characterized in that Determining the self-discharge standard voltage according to the voltage mean and the voltage standard deviation includes: When the voltage standard deviation is within a set range, the self-discharge standard voltage is obtained according to the voltage mean and voltage standard deviation of each first battery cell and the self-discharge influencing parameter; wherein the self-discharge influencing parameter includes a physical self-discharge influencing value and a chemical self-discharge influencing value.

6. The method according to claim 5, characterized in that The physical self-discharge impact value is a target daily loss voltage value of the physical self-discharge of the battery cell determined according to the monthly loss voltage value of the physical self-discharge of the battery cell and the target voltage loss rate, and the chemical self-discharge impact value is the impact value of the polarization reaction and side reaction of the battery cell on the voltage.

7. The method according to claim 4, characterized in that Determining the self-discharge standard voltage according to the voltage mean and the voltage standard deviation includes: When the voltage standard deviation is not within the set range, the reference self-discharge standard voltage is used as the self-discharge standard voltage; wherein the reference self-discharge standard voltage is obtained based on the self-discharge voltage test data of all cells in multiple battery trays of the power battery.

8. The method according to claim 1, characterized in that The comparing the self-discharge voltage with the self-discharge standard voltage to determine whether the battery cell has self-discharge abnormality comprises: When the self-discharge voltage is greater than the self-discharge standard voltage, it is determined that the self-discharge of the battery cell is abnormal.

9. An electronic device, characterized in that: It comprises a memory and a processor, the memory stores executable instructions, and the instructions are used to control the processor to operate so as to execute the battery cell self-discharge abnormality detection method according to any one of claims 1-8.

10. A readable storage medium, characterized in that: A computer program is stored, and when the computer program is executed by a processor, the method for detecting abnormal self-discharge of a battery cell according to any one of claims 1 to 8 is implemented.

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