Short circuit detection method and energy storage device

Abstract

The present application belongs to the field of battery technology, and in particular, relates to a short circuit detection method and energy storage device. The short circuit detection method includes: obtaining the working state of the battery pack, the working state including the static state and the charging state; when the working state is the static state, monitoring the change in the cell parameters of each cell in the battery pack per unit time, and identifying the short circuit condition of the battery pack according to the change in the cell parameters; when the working state is the charging state, monitoring the change in the charging parameters of each cell in the battery pack, and identifying the short circuit condition of the battery pack according to the change in the charging parameters, wherein the cell parameters and the charging parameters are different parameters. The present application executes different short circuit detection strategies according to whether the battery pack is in a static state or a charging state, so that the detection result for the short circuit condition of the battery pack can be more timely and accurate.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a short circuit detection method and an energy storage device. Background Art

[0002] With the dwindling availability of oil resources and the increasing severity of environmental pollution, environmental protection and energy conservation and emission reduction have become global trends. Against this backdrop, the number of machines powered primarily or partially by batteries has steadily increased in recent years, with electric vehicles gradually replacing internal combustion engines. This indicates that, driven by current technological developments, the application areas and levels of batteries are continuously expanding, and their importance as an energy source is also steadily increasing.

[0003] Among various types of batteries, lithium-ion batteries are the most widely used in our daily lives. They are highly popular due to their high charge and discharge rates, high energy density, high average output voltage, long service life, and lack of toxic or hazardous substances. However, lithium-ion batteries can short-circuit during both production and use. When a short-circuit occurs in a lithium-ion battery, it can render the battery unusable, causing the battery cell to over-discharge to zero voltage. In more serious cases, it can cause a safety accident, threatening people's lives and property.

[0004] Therefore, how to better deal with short circuits in lithium-ion batteries and thus improve the practicality of lithium-ion batteries is a difficult problem that urgently needs to be solved in the field of battery technology. Summary of the Invention

[0005] The main purpose of the present invention is to provide a short-circuit detection method and energy storage device, which aims to implement different short-circuit detection strategies for the battery according to whether the battery is in a static state or a charging state, so that the detection results of the battery short-circuit situation can be more timely and accurate, thereby better coping with the battery short-circuit situation.

[0006] According to one aspect of an embodiment of the present application, a short circuit detection method is disclosed, which is applied to a battery pack, wherein the battery pack includes at least one battery cell. The short circuit detection method includes:

[0007] Acquire a working state of the battery pack, where the working state includes a static state and a charging state. In the static state, the battery pack does not have a charging operation or a discharging operation.

[0008] When the working state is the static state, monitoring a change in a cell parameter of each cell in the battery pack per unit time, and identifying a short circuit condition of the battery pack according to the change in the cell parameter;

[0009] When the working state is the charging state, the change in the charging parameter of each battery cell in the battery pack is monitored, and the short circuit condition of the battery pack is identified according to the change in the charging parameter, and the battery cell parameter and the charging parameter are different parameters.

[0010] In some embodiments of the present application, based on the above technical solution, the cell parameter includes a cell voltage; and the monitoring of the change in the cell parameter per unit time of each cell in the battery pack is as follows:

[0011] Monitoring the cell voltage change of the cell per unit time;

[0012] The ratio of the cell voltage change to the unit time is calculated, and the ratio of the cell voltage change to the unit time is used as the cell parameter change.

[0013] In some embodiments of the present application, based on the above technical solution, identifying the short circuit condition of the battery pack according to the change in the cell parameter includes:

[0014] When the cell voltage variation is within an abnormal threshold range, it is determined that a short circuit occurs in the battery pack.

[0015] In some embodiments of the present application, based on the above technical solution, identifying the short circuit condition of the battery pack according to the change in the cell parameter includes:

[0016] Sending the change in the battery cell parameter to a data analysis system, so that the data analysis system performs short circuit analysis based on the change in the battery cell parameter;

[0017] receiving parameter analysis information sent by the data analysis system after short circuit analysis, wherein the parameter analysis information includes flag information;

[0018] When the flag information is short-circuit flag information, it is determined that a short circuit occurs in the battery pack.

[0019] In some embodiments of the present application, based on the above technical solution, the charging parameters include constant voltage charging time and constant voltage charging capacity; monitoring the change in the charging parameters of each battery cell in the battery pack and identifying the short circuit condition of the battery pack based on the change in the charging parameters includes:

[0020] When the battery pack enters the constant voltage charging stage, monitoring the constant voltage charging time and constant voltage charging capacity of each cell in the battery pack;

[0021] When the constant voltage charging time of the battery cell is greater than a preset constant voltage charging time, or the constant voltage charging capacity of the battery cell is greater than a preset ratio of the capacity of the battery cell, it is determined that the battery pack has a short circuit.

[0022] In some embodiments of the present application, based on the above technical solution, the charging parameter includes the number of voltage fluctuations of the battery cell within a preset time; monitoring the change in the charging parameter of each battery cell in the battery pack and identifying the short circuit condition of the battery pack based on the change in the charging parameter includes:

[0023] When the battery pack enters a constant voltage charging stage, monitoring the number of voltage fluctuations of each cell in the battery pack within a preset time;

[0024] When it is monitored that the number of voltage fluctuations of any of the battery cells is greater than a preset number of fluctuations, it is determined that a short circuit occurs in the battery pack.

[0025] In some embodiments of the present application, based on the above technical solution, the charging parameter includes the number of times that the voltage difference between the maximum cell voltage and the minimum cell voltage in the battery pack exceeds a preset voltage threshold within a preset time; monitoring the change in the charging parameter of each cell in the battery pack and identifying the short circuit condition of the battery pack based on the change in the charging parameter includes:

[0026] When the battery pack enters the constant voltage charging stage, if it is monitored that the voltage difference exceeds the preset voltage threshold value for a preset number of times, it is determined that the battery pack has a short circuit.

[0027] In some embodiments of the present application, based on the above technical solution, the short circuit detection method further includes:

[0028] Obtaining the full battery capacity Cn+1 of the battery pack after the n+1th charge and the full battery capacity Cn after the nth charge, where n is a natural number greater than or equal to 1;

[0029] When the ratio of the full power capacity Cn+1 to the full battery capacity Cn is greater than a preset ratio, it is determined that a short circuit occurs in the battery pack.

[0030] In some embodiments of the present application, based on the above technical solution, the short circuit detection method further includes:

[0031] Obtaining the total charging capacity of the battery pack after charging is completed;

[0032] If the total charging capacity is greater than a preset capacity threshold, it is determined that a short circuit occurs in the battery pack.

[0033] According to one aspect of an embodiment of the present application, an energy storage device is disclosed, which includes: a battery pack, a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the battery pack includes at least one battery cell; the computer program is executed by the processor as in the short-circuit detection method in the above technical solution.

[0034] According to one aspect of an embodiment of the present application, a computer program product or computer program is provided, the computer program product or computer program including computer instructions stored in a computer-readable storage medium. A processor of a computer device reads the computer instructions from the computer-readable storage medium and executes the computer instructions, causing the computer device to perform the short circuit detection method described in the above technical solution.

[0035] The short-circuit detection method provided in the present application first obtains the battery status of the battery pack, and the battery status includes a static state corresponding to the battery not having any charging or discharging behavior, and a charging state corresponding to the battery undergoing charging operation; when the battery pack is in a static state, the short-circuit condition of the battery pack is determined based on the amount of change in the battery cell parameters of each battery cell contained in the battery per unit time; when the battery pack is in a charging state, the short-circuit condition of the battery pack is determined based on the amount of change in the charging parameters of each battery cell contained in the battery per unit time.

[0036] In this way, the short-circuit detection method provided in the present application executes different short-circuit detection strategies on the battery pack according to whether the battery pack is in a static state or a charging state, so that the detection results of the short-circuit condition of the battery pack can be more timely and accurate, avoiding the use of a fixed detection strategy to perform short-circuit detection on the battery pack, which causes the detection results to be affected by the different working states of the battery pack and causes a decrease in reliability, thereby being able to better deal with the situation where the battery pack has a short circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The accompanying drawings are incorporated into and constitute a part of the specification, illustrate embodiments consistent with the present application, and together with the specification, are used to explain the principles of the present application. Obviously, the drawings described below are only some embodiments of the present application, and those skilled in the art can derive other drawings based on these drawings without inventive effort.

[0038] Figure 1 A flowchart of the steps of a short circuit detection method in one embodiment of the present application is shown.

[0039] Figure 2 An application flow chart of short circuit detection for a battery pack in a static state in one embodiment of the present application is shown.

[0040] Figure 3 An application flow chart of short circuit detection for a battery pack in a charging state in one embodiment of the present application is shown. DETAILED DESCRIPTION

[0041] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this application will be thorough and complete and will fully convey the concepts of the example embodiments to those skilled in the art.

[0042] In addition, described feature, structure or characteristic can be combined in one or more embodiments in any suitable manner.In the following description, many specific details are provided so as to provide a full understanding of the embodiments of the present application. However, it will be appreciated by those skilled in the art that the technical scheme of the present application can be put into practice without one or more of the specific details, or other methods, components, devices, steps etc. can be adopted. In other cases, known methods, devices, implementations or operations are not shown or described in detail to avoid blurring the various aspects of the application.

[0043] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically separate entities. That is, these functional entities may be implemented in software, in one or more hardware modules or integrated circuits, or in different networks and / or processor devices and / or microcontroller devices.

[0044] The flowcharts shown in the accompanying drawings are for illustrative purposes only and do not necessarily include all contents and operations / steps, nor must they be executed in the order described. For example, some operations / steps may be decomposed, while others may be combined or partially combined. Therefore, the actual execution order may vary depending on the actual situation.

[0045] Currently, lithium-ion batteries are susceptible to short circuits during both production and use. This can render the battery unusable, for example, by overdischarging the battery cell until the voltage drops to zero. In severe cases, it can cause safety incidents, threatening life and property. Therefore, how to better address short circuits in lithium-ion batteries and improve their practicality remains a pressing challenge in the battery technology field.

[0046] The following is a detailed description of the technical solutions such as the short-circuit detection method and energy storage device provided in this application in conjunction with specific implementation methods.

[0047] Figure 1 A flowchart of the steps of a short circuit detection method in an embodiment of the present application is shown. The short circuit detection method may mainly include the following steps S100 to S300.

[0048] Step S100 , obtaining the working state of the battery pack, where the working state includes a static state and a charging state. In the static state, the battery pack does not have a charging operation or a discharging operation.

[0049] Specifically, by monitoring whether there is a charge and discharge operation on the battery pack, the working state of the battery pack is determined. When there is no charge and discharge operation on the battery pack, the battery pack is determined to be in a static state. When there is a charging operation on the battery pack, the battery pack is determined to be in a charging state, so as to adopt different short-circuit detection strategies according to the working state of the battery pack.

[0050] Step S200 , when the working state is the static state, monitoring the change in the cell parameter of each cell in the battery pack per unit time, and identifying the short circuit condition of the battery pack according to the change in the cell parameter.

[0051] It should be noted that when monitoring the change in the cell parameters of each cell in a battery pack per unit time, it is necessary to simultaneously monitor whether the ambient temperature fluctuation of the battery pack exceeds a certain temperature threshold, such as 3°C or 5°C, during that unit time. This prevents the battery pack from experiencing abnormal changes in cell parameters due to excessive ambient temperature fluctuations, which could lead to a false diagnosis of a short circuit. In other words, only when the ambient temperature fluctuations of the battery pack do not exceed a certain temperature threshold can the change in the cell parameters of each cell in the battery pack per unit time be used as a basis for determining whether the battery pack has a short circuit.

[0052] Step S300, when the working state is the charging state, monitor the change in the charging parameter of each battery cell in the battery pack, identify the short circuit condition of the battery pack according to the change in the charging parameter, and the battery cell parameter and the charging parameter are different parameters.

[0053] When the battery pack is in a charging state, the change in the charging parameters of the battery cells of the battery pack during the charging process is monitored. When there is an abnormality in the change in the charging parameters of the battery cells, it indicates that a short circuit has occurred in the battery pack during the charging process.

[0054] The short-circuit detection method provided in the present application first obtains the battery status of the battery pack, and the battery status includes a static state corresponding to the battery not having any charging or discharging behavior, and a charging state corresponding to the battery undergoing charging operation; when the battery pack is in a static state, the short-circuit condition of the battery pack is determined based on the amount of change in the battery cell parameters of each battery cell contained in the battery per unit time; when the battery pack is in a charging state, the short-circuit condition of the battery pack is determined based on the amount of change in the charging parameters of each battery cell contained in the battery per unit time.

[0055] In this way, the short-circuit detection method provided in the present application executes different short-circuit detection strategies on the battery pack according to whether the battery pack is in a static state or a charging state, so that the detection results of the short-circuit condition of the battery pack can be more timely and accurate, avoiding the use of a fixed detection strategy to perform short-circuit detection on the battery pack, which causes the detection results to be affected by the different working states of the battery pack and causes a decrease in reliability, thereby being able to better deal with the situation where the battery pack has a short circuit.

[0056] Furthermore, if Figure 2 As shown, in one embodiment of the present application, the cell parameters include cell voltage, and the monitoring of the change in the cell parameters of each cell in the battery pack per unit time in the above step S200 includes the following steps S201 and S202.

[0057] Step S201 , monitoring the cell voltage change per unit time.

[0058] Step S202 , calculating a ratio of the cell voltage change to the unit time, and taking the ratio of the cell voltage change to the unit time as the cell parameter change.

[0059] Specifically, for example, the voltage U1 of each cell in the battery pack at time t1 and the voltage U2 at time t2 are collected, and the cell voltage change k = (U1-U2) / (t2-t1).

[0060] Further, based on the above embodiment, the step S200 of identifying the short circuit of the battery pack according to the change in the cell parameter includes the following steps:

[0061] When the cell voltage variation is within an abnormal threshold range, it is determined that a short circuit occurs in the battery pack.

[0062] Specifically, the battery pack's cells are pre-calibrated to a range of values. When a cell's voltage change is detected outside this range, it's considered abnormal and a short circuit has occurred in that cell. Because the cells in a battery pack are connected in series or parallel, a short circuit in that cell will also short-circuit the battery pack it's in.

[0063] Furthermore, in an embodiment provided by the present application, the step S200 of identifying the short circuit condition of the battery pack according to the change in the cell parameter includes the following steps:

[0064] The changes in the battery cell parameters are sent to a data analysis system, so that the data analysis system performs short circuit analysis based on the changes in the battery cell parameters.

[0065] Receive parameter analysis information sent by the data analysis system after short circuit analysis, where the parameter analysis information includes flag information.

[0066] When the flag information is short-circuit flag information, it is determined that a short circuit occurs in the battery pack.

[0067] Specifically, after obtaining the cell voltage change of each battery cell, the battery pack sends the above cell voltage change to a data analysis system, which can be a physical processor, or a cloud server, etc. The data analysis system then performs big data analysis on the above cell voltage change. When the data analysis system determines that the cell voltage change of a certain battery cell belongs to a short-circuit value situation, the data analysis system sends parameter analysis information including short-circuit flag information to the battery pack. After receiving the parameter analysis information, the battery pack determines the specific battery cell that has short-circuited according to the short-circuit flag information in the parameter analysis information.

[0068] In this way, this embodiment provides two specific methods for determining whether a short circuit occurs in the battery cells included in the battery pack according to the change in the battery cell parameters when the battery pack is in a stationary state, thereby improving the practicality of the technical solution of the present application.

[0069] Furthermore, if Figure 3 As shown, in one embodiment provided in the present application, the charging parameters include constant voltage charging time and constant voltage charging capacity, and the above-mentioned step S300 monitors the change in the charging parameters of each battery cell in the battery pack, and identifies the short circuit condition of the battery pack according to the change in the charging parameters, including the following steps S301 and S302.

[0070] Step S301 , when the battery pack enters a constant voltage charging stage, monitoring the constant voltage charging time and constant voltage charging capacity of each cell in the battery pack.

[0071] Step S302 : When the constant voltage charging time of the battery cell is greater than a preset constant voltage charging time, or the constant voltage charging capacity of the battery cell is greater than a preset ratio of the capacity of the battery cell, it is determined that the battery pack has a short circuit.

[0072] Specifically, when the battery pack enters the constant-voltage charging stage, if the constant-voltage charging time of the battery cell in the battery pack exceeds the pre-set constant-voltage charging time, that is, the constant-voltage charging time of the battery cell is too long, then it is considered that there is an abnormality in the constant-voltage charging stage of the battery cell, and it is determined that the battery cell is short-circuited, that is, the battery pack where the battery cell is located is short-circuited.

[0073] For example, when the battery pack enters the constant voltage charging stage, it starts to record the charging time of the battery cell, which is recorded as Tconstant voltage. Assuming that the preset constant voltage charging time is 90 minutes, when Tconstant voltage is greater than 90 minutes, it records "suspected short circuit in the battery cell" and provides feedback.

[0074] Alternatively, if the charging capacity of the battery cells in the battery pack exceeds a preset battery cell capacity ratio, that is, the charging capacity of the battery cells in the constant voltage stage is too much, then it is considered that there is an abnormality in the constant voltage charging stage, and it is determined that the battery cell is short-circuited, that is, the battery pack where the battery cell is located is short-circuited.

[0075] For example, when the battery pack enters the constant voltage charging stage, it starts to record the charging capacity of the battery cell, which is recorded as C constant voltage. Assuming that the preset ratio of the battery cell capacity is 20%, when C constant voltage is greater than 20% of the battery cell capacity, it records "suspected short circuit in the battery cell" and provides feedback.

[0076] In this way, this embodiment provides a specific method for determining whether a short circuit occurs in the battery pack based on the constant voltage charging time or constant voltage charging capacity of the battery cell when the battery pack is in a charging state and enters the constant voltage charging stage, thereby improving the practicality of the technical solution of this application.

[0077] Furthermore, in an embodiment provided herein, the charging parameter further includes the number of voltage fluctuations of the battery cell within a preset time. The monitoring of the change in the charging parameter of each battery cell in the battery pack in step S300 and identifying the short circuit condition of the battery pack based on the change in the charging parameter include the following steps:

[0078] When the battery pack enters the constant voltage charging stage, the number of voltage fluctuations of each cell in the battery pack within a preset time is monitored.

[0079] When it is monitored that the number of voltage fluctuations of any of the battery cells is greater than a preset number of fluctuations, it is determined that a short circuit occurs in the battery pack.

[0080] Specifically, when the battery pack enters the constant voltage charging stage, the difference between two adjacent voltages of the battery cells exceeding a certain threshold is regarded as voltage fluctuation. If the number of voltage fluctuations of the battery cells in the battery pack within the preset time is greater than the preset number of fluctuations, that is, the number of voltage fluctuations of the battery cells within a certain period of time is too many, then it is considered that there is an abnormality in the constant voltage charging stage of the battery cell, and it is determined that the battery cell is short-circuited, that is, the battery pack where the battery cell is located is short-circuited.

[0081] For example, when a battery pack enters the constant voltage charging stage, the battery pack voltage is recorded during each constant voltage segment. If |cell voltage 1 - cell voltage 2| ≥ 30mV, it is considered that the battery pack's cells have voltage fluctuations. If such voltage fluctuations occur more than ten times within five consecutive minutes, a "suspected short circuit in the battery pack" is recorded and reported. Cell voltage 1 represents the cell voltage at the current sampling moment, and cell voltage 2 represents the cell voltage at the previous sampling moment.

[0082] Furthermore, in an embodiment provided by the present application, the charging parameter also includes the number of times that the voltage difference between the maximum cell voltage and the minimum cell voltage in the battery pack exceeds a preset voltage threshold within a preset time. The monitoring of the change in the charging parameter of each cell in the battery pack in the above step S300 and identifying the short circuit condition of the battery pack based on the change in the charging parameter further includes the following steps:

[0083] When the battery pack enters the constant voltage charging stage, if it is monitored that the voltage difference exceeds the preset voltage threshold value for a preset number of times, it is determined that the battery pack has a short circuit.

[0084] Specifically, when the battery pack enters the constant voltage charging stage, the cell voltage of each cell in the battery pack at the same sampling time is obtained, and the maximum voltage and minimum voltage in the collected data are obtained. If the difference between the maximum voltage and the minimum voltage of the cells in the battery pack exceeds a certain threshold, it is considered a voltage fluctuation. If the voltage difference between the maximum voltage and the minimum voltage in the battery pack exceeds the preset voltage threshold a preset number of times within a preset time, the battery pack is determined to have a short circuit. It should be noted that when the battery pack is composed of multiple cells, the rated voltage of each cell is within a preset range. When the voltage difference between the cells in the battery pack exceeds the preset voltage threshold, it indicates that there is an abnormality in the cells in the battery pack.

[0085] For example, when the battery pack enters the constant voltage charging stage, the cell voltage of each cell in the battery pack is recorded in each constant voltage charging segment. When the battery pack has |maximum cell voltage - minimum cell voltage| ≥ 50mV, it is considered that there is voltage fluctuation in the battery pack. If the above voltage fluctuation occurs more than ten times within five consecutive minutes, "suspected short circuit in the battery pack" is recorded and feedback is given.

[0086] In this way, this embodiment provides a specific method for determining whether a short circuit occurs in the battery pack based on the voltage fluctuations between the battery cells in the battery pack when the battery pack is in a charging state and enters the constant voltage charging stage, thereby improving the practicality of the technical solution of the present application.

[0087] Furthermore, in an embodiment provided in the present application, the short circuit detection method further includes the following steps:

[0088] Obtain the full battery capacity Cn+1 of the battery pack after the n+1th charging and the full battery capacity Cn after the nth charging; n is a natural number greater than or equal to 1.

[0089] When the ratio of the full power capacity Cn+1 to the full battery capacity Cn is greater than a preset ratio, it is determined that a short circuit occurs in the battery pack.

[0090] Specifically, the full battery capacities corresponding to two adjacent charging operations of the battery pack are compared. If the ratio of the two full battery capacities is greater than a preset ratio, it is considered that a short circuit has occurred in the battery pack, resulting in an excessively large full battery capacity after the second charging operation.

[0091] For example, the third charging capacity C3 and the fourth charging capacity C4 of the battery pack are recorded. When the fourth charging capacity C4 is greater than 1.2 times the third charging capacity C3, and there is a capacity difference between the two full charge mark positions, a "suspected short circuit in the battery cell" is recorded and fed back.

[0092] Furthermore, in an embodiment provided in the present application, the short circuit detection method further includes the following steps:

[0093] Obtain the total charging capacity of the battery pack after charging is completed.

[0094] If the total charging capacity is greater than a preset capacity threshold, it is determined that a short circuit occurs in the battery pack.

[0095] Specifically, the total charging capacity of the battery pack after a single charge is compared with a preset capacity threshold. If the total charging capacity is greater than the capacity threshold, it is considered that a short circuit has occurred in the battery pack, resulting in the total charging capacity of the battery pack being too large after the charge is completed.

[0096] For example, the total charging capacity of the battery pack after each charging is recorded. Assuming that the preset capacity threshold is 1.3 times the battery's own capacity, when the total charging capacity ≥ 1.3 times the battery's own capacity, record "suspected short circuit in the battery pack" and feedback.

[0097] In this way, this embodiment provides two methods for determining whether a short circuit occurs in the battery pack based on the charging capacity of the battery pack after charging is completed, thereby improving the practicality of the technical solution of the present application.

[0098] Furthermore, in an embodiment provided in the present application, the short circuit detection method further includes the following steps:

[0099] When it is determined that a short circuit occurs in the battery pack, the short circuit type is determined according to cell parameters or charging parameters of the battery pack.

[0100] The short circuit type of the battery pack is sent to a target device, and the battery pack is set to a disabled state.

[0101] Specifically, in the technical solution of the above embodiment, when it is determined that the battery pack has a short circuit, after determining the short circuit type of the battery pack, the short circuit type of the battery pack is sent to the target device. The target device can be a mobile terminal installed with an operating application APP, so that the user can handle it according to the short circuit type displayed on the mobile terminal, which is convenient for the user to monitor the usage or abnormal conditions of the battery pack. The target device can also be a monitoring device for maintenance personnel, which is used to receive and display the short circuit type to facilitate maintenance personnel to repair the short-circuited battery pack. In this embodiment, the battery pack is also set to a disabled state. In the disabled state, the battery pack does not respond to any operation directed to the battery pack, thereby preventing the battery pack from being damaged after being forcibly activated by the user in the event of a short circuit.

[0102] According to one aspect of an embodiment of the present application, an energy storage device is provided, comprising: a battery pack, a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the battery pack comprises at least one battery cell; the computer program is executed by the processor as in the short-circuit detection method of the above technical solution.

[0103] According to one aspect of an embodiment of the present application, an electronic device is provided, comprising: a battery pack, a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the battery pack comprises at least one battery cell; the computer program is executed by the processor as in the short-circuit detection method in the above technical solution.

[0104] In particular, according to an embodiment of the present application, the processes described in the various method flow charts can be implemented as computer software programs. For example, an embodiment of the present application includes a computer program product comprising a computer program carried on a computer-readable medium, the computer program comprising program code for executing the methods shown in the flow charts. In such an embodiment, the computer program can be downloaded and installed over a network and / or installed from a removable medium. When the computer program is executed by a processor, the various functions defined in the energy storage device of the present application are executed.

[0105] It should be noted that the computer-readable medium shown in the embodiments of the present application may be a computer-readable signal medium or a computer-readable storage medium or any combination of the two. The computer-readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or component, or any combination of the above. More specific examples of computer-readable storage media may include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM), a flash memory, an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In the present application, a computer-readable storage medium may be any tangible medium containing or storing a program that can be used by or in combination with an instruction execution system, device or device. In the present application, a computer-readable signal medium may include a data signal propagated in baseband or as part of a carrier wave, which carries a computer-readable program code. Such propagated data signals may take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. A computer-readable signal medium may also be any computer-readable medium other than a computer-readable storage medium that can transmit, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device. Program code embodied on a computer-readable medium may be transmitted using any suitable medium, including but not limited to wireless, wired, or any suitable combination thereof.

[0106] The flowcharts and block diagrams in the accompanying drawings illustrate the possible implementation architecture, functions and operations of the systems, methods and computer program products according to various embodiments of the present application. In this regard, each box in the flowchart or block diagram can represent a module, program segment, or a part of code, and the above-mentioned module, program segment, or a part of code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in an order different from that marked in the accompanying drawings. For example, two boxes represented in succession 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 or flowchart, and the combination of the boxes in the block diagram or flowchart, can be implemented with a dedicated hardware-based system that performs the specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0107] It should be noted that, although several modules or units of the device for action execution are mentioned in the above detailed description, this division is not mandatory. In fact, according to the embodiment of the application, the features and functions of two or more modules or units described above can be concretized in one module or unit. On the contrary, the features and functions of one module or unit described above can be further divided into multiple modules or units to be concretized.

[0108] Through the description of the above embodiments, it is easy for those skilled in the art to understand that the example embodiments described herein can be implemented by software or by combining software with necessary hardware. Therefore, the technical solution according to the embodiments of the present application can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, a USB flash drive, a mobile hard disk, etc.) or on a network, and includes several instructions to enable a computing device (which can be a personal computer, a server, a touch terminal, or a network device, etc.) to execute the method according to the embodiments of the present application.

[0109] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and practicing the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present invention that follow the general principles of this application and include common knowledge or customary techniques in the art that are not disclosed herein.

[0110] It should be understood that the present application is not limited to the exact structures described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A short circuit detection method, characterized in that: Applied to a battery pack, the battery pack includes a plurality of battery cells, and the short circuit detection method includes: Acquire a working state of the battery pack, where the working state includes a static state and a charging state. In the static state, the battery pack does not have a charging operation or a discharging operation. When the working state is the stationary state, monitoring a change in a cell parameter of each cell in the battery pack per unit time and a temperature fluctuation of an environment in which the battery pack is located, and identifying a short circuit condition of the battery pack based on the change in the cell parameter when the temperature fluctuation of the environment in which the battery pack is located does not exceed a preset temperature threshold; When the working state is the charging state, a change in a charging parameter of each of the battery cells in the battery pack is monitored, and a short circuit condition of the battery pack is identified according to the change in the charging parameter, wherein the battery cell parameter and the charging parameter are different parameters; wherein: When the working state is the charging state, monitoring a change in a charging parameter of each of the battery cells in the battery pack, and identifying a short circuit condition of the battery pack according to the change in the charging parameter includes: When the battery pack enters the constant voltage charging stage, obtaining the cell voltage of each cell in the battery pack at multiple sampling moments within a preset time, and obtaining the maximum cell voltage and the minimum cell voltage among the sampled multiple cell voltages; Determining the number of times a voltage difference between a maximum cell voltage and a minimum cell voltage in the battery pack exceeds a preset voltage threshold; When it is monitored that the voltage difference exceeds the preset voltage threshold value for a preset number of times, it is determined that the battery pack has a short circuit.

2. The short circuit detection method according to claim 1, wherein: The cell parameters include cell voltage; the monitoring of the change in the cell parameters of each cell in the battery pack per unit time: Monitoring the cell voltage change of the cell per unit time; The ratio of the cell voltage change to the unit time is calculated, and the ratio of the cell voltage change to the unit time is used as the cell parameter change.

3. The short circuit detection method according to claim 2, wherein: The identifying the short circuit condition of the battery pack according to the change in the battery cell parameter includes: When the cell voltage variation is within an abnormal threshold range, it is determined that a short circuit occurs in the battery pack.

4. The short circuit detection method according to claim 2, wherein: The identifying the short circuit condition of the battery pack according to the change in the battery cell parameter includes: Sending the change in the battery cell parameter to a data analysis system, so that the data analysis system performs short circuit analysis based on the change in the battery cell parameter; receiving parameter analysis information sent by the data analysis system after short circuit analysis, wherein the parameter analysis information includes flag information; When the flag information is short-circuit flag information, it is determined that a short circuit occurs in the battery pack.

5. The short circuit detection method according to claim 1, wherein: The charging parameters include constant voltage charging time and constant voltage charging capacity; The monitoring of the change in the charging parameter of each cell in the battery pack and identifying the short circuit condition of the battery pack according to the change in the charging parameter includes: When the battery pack enters the constant voltage charging stage, monitoring the constant voltage charging time and constant voltage charging capacity of each cell in the battery pack; When the constant voltage charging time of the battery cell is greater than a preset constant voltage charging time, or the constant voltage charging capacity of the battery cell is greater than a preset ratio of the capacity of the battery cell, it is determined that the battery pack has a short circuit.

6. The short circuit detection method according to claim 1, wherein: The charging parameter includes the number of voltage fluctuations of the battery cell within a preset time; monitoring the change in the charging parameter of each battery cell in the battery pack and identifying the short circuit condition of the battery pack according to the change in the charging parameter includes: When the battery pack enters a constant voltage charging stage, monitoring the number of voltage fluctuations of each cell in the battery pack within a preset time; When it is monitored that the number of voltage fluctuations of any of the battery cells is greater than a preset number of fluctuations, it is determined that a short circuit occurs in the battery pack.

7. The short circuit detection method according to claim 1, wherein: The short circuit detection method further includes: Obtaining the full battery capacity Cn+1 of the battery pack after the n+1th charge and the full battery capacity Cn after the nth charge, where n is a natural number greater than or equal to 1; When the ratio of the full power capacity Cn+1 to the full battery capacity Cn is greater than a preset ratio, it is determined that a short circuit occurs in the battery pack.

8. The short circuit detection method according to claim 1, wherein: The short circuit detection method further includes: Obtaining the total charging capacity of the battery pack after charging is completed; If the total charging capacity is greater than a preset capacity threshold, it is determined that a short circuit occurs in the battery pack.

9. An energy storage device, characterized in that: The energy storage device includes: a battery pack, a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the battery pack includes at least one battery cell; When the computer program is executed by the processor, the short circuit detection method according to any one of claims 1 to 8 is implemented.

Images