Method, device and equipment for detecting thermal runaway of battery

Abstract

The embodiment of the invention discloses a battery thermal runaway detection method, device and equipment. The battery thermal runaway detection method comprises the following steps: obtaining the residual electric quantity of each battery cell in a target battery; wherein the target battery comprises a plurality of battery cells; when the residual electric quantity is higher than a preset electric quantity threshold, detecting the internal resistance of the battery cell based on a preset period and a preset frequency; determining the internal resistance change rate of the battery cell according to the internal resistance of the battery cell and a preset period; and determining whether thermal runaway occurs in the target battery according to the internal resistance change rate. According to the battery thermal runaway detection method, device and equipment provided by the embodiment of the invention, the detection reliability can be ensured.

Description

[0001] This application claims priority to the patent application dated November 5, 2024, application number 202411568766X, entitled "A method, apparatus and device for detecting battery thermal runaway". Technical Field

[0002] The embodiments of the present invention relate to battery technology, and more particularly to a method, apparatus and device for detecting battery thermal runaway. Background Technology

[0003] For batteries used in new energy vehicles, such as lithium batteries, thermal runaway detection is crucial to battery safety. With the increasing popularity of new energy vehicles, lithium batteries have become the mainstream choice for automotive power batteries, and their safety has received growing attention. The highly active electrode materials and flammable electrolyte materials of lithium batteries mean that the risk of thermal runaway is always present. Thermal runaway is a gradual process, usually caused by violent side reactions of the electrolyte. This process leads to an increase in internal pressure and temperature of the battery, which may eventually cause a fire or explosion.

[0004] Currently, existing methods for detecting battery thermal runaway typically involve monitoring battery voltage, surface temperature, and internal gases and fumes to issue an alarm in the later stages of thermal runaway. However, the later stages of thermal runaway are very short, leaving insufficient time for human intervention. Alternatively, methods may rely on analyzing large amounts of pre-obtained data to detect the probability of battery thermal runaway risk before it occurs, allowing for battery replacement to avoid the risk. However, this method is prone to errors due to missing data, resulting in low accuracy and compromised reliability. Summary of the Invention

[0005] This invention provides a method, apparatus, and device for detecting battery thermal runaway to ensure detection reliability.

[0006] In a first aspect, embodiments of the present invention provide a method for detecting battery thermal runaway, comprising:

[0007] Obtain the remaining charge of each cell in the target battery; wherein the target battery includes multiple cells;

[0008] When the remaining power is higher than a preset power threshold, the internal resistance of the battery cell is detected based on a preset period and a preset frequency;

[0009] The rate of change of the internal resistance of the battery cell is determined based on the internal resistance of the battery cell and the preset period.

[0010] Based on the rate of change of internal resistance, determine whether the target battery has experienced thermal runaway.

[0011] Optionally, determining the rate of change of the internal resistance of the battery cell based on its internal resistance and the preset period includes:

[0012] The difference is obtained by subtracting the internal resistance of the cell in the current cycle from the internal resistance in the previous cycle.

[0013] The ratio of the difference to the preset period is used as the rate of change of the internal resistance of the battery cell.

[0014] Optionally, determining whether the target battery has experienced thermal runaway based on the rate of change of internal resistance includes:

[0015] Based on the internal resistance change rate, determine the mean S_agv and standard deviation S_std of the internal resistance change rate of all cells in the target battery;

[0016] If the rate of change of internal resistance of at least one cell is greater than S_agv+nS_std or less than S_agv-nS_std, then the target battery is determined to be in thermal runaway, where n is a positive integer greater than or equal to 3, and S_agv-nS_std is less than zero.

[0017] Optionally, determining that the target battery is in thermal runaway if the rate of change of internal resistance of at least one cell is greater than S_agv+nS_std or less than S_agv-nS_std includes:

[0018] If at least one cell has an internal resistance change rate greater than S_agv+nS_std or less than S_agv-nS_std in m consecutive cycles, then the target battery is determined to be in thermal runaway, where m is a positive integer.

[0019] Optionally, after determining that the target battery is in thermal runaway, the process includes:

[0020] Issue an early warning notification regarding the thermal runaway of the target battery.

[0021] Optionally, the target battery is a lithium battery, the preset cycle ranges from 5s to 200s, and the preset frequency is greater than 1Hz.

[0022] Secondly, embodiments of the present invention provide a battery thermal runaway detection device, comprising:

[0023] A power acquisition module is used to acquire the remaining power of each cell in the target battery; wherein the target battery includes multiple cells;

[0024] An internal resistance detection module is used to detect the internal resistance of the battery cell based on a preset period and a preset frequency when the remaining power is higher than a preset power threshold.

[0025] A rate determination module is used to determine the rate of change of the internal resistance of the battery cell based on the internal resistance of the battery cell and the preset period.

[0026] The thermal runaway determination module is used to determine whether the target battery has experienced thermal runaway based on the rate of change of internal resistance.

[0027] Optionally, the thermal runaway determination module includes:

[0028] The mean determination unit is used to determine the mean S_agv and standard deviation S_std of the internal resistance change rate of all cells in the target battery based on the internal resistance change rate.

[0029] The thermal runaway determination unit is used to determine that the target battery is in thermal runaway if the rate of change of internal resistance of at least one cell is greater than S_agv+nS_std or less than S_agv-nS_std, where n is a positive integer greater than or equal to 3 and S_agv-nS_std is less than zero.

[0030] Thirdly, embodiments of the present invention provide an apparatus, the apparatus comprising:

[0031] One or more processors;

[0032] Storage device for storing one or more programs;

[0033] When the one or more programs are executed by the one or more processors, the one or more processors implement the battery thermal runaway detection method as described in the first aspect.

[0034] Fourthly, embodiments of the present invention provide a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the battery thermal runaway detection method as described in the first aspect.

[0035] The present invention provides a method, apparatus, and device for detecting battery thermal runaway. The method includes: acquiring the remaining charge of each cell in a target battery; wherein the target battery includes multiple cells; when the remaining charge exceeds a preset charge threshold, detecting the internal resistance of the cells based on a preset period and a preset frequency; determining the rate of change of the internal resistance of the cells based on the internal resistance and the preset period; and determining whether the target battery has experienced thermal runaway based on the rate of change of the internal resistance. The method, apparatus, and device provided by the present invention determine whether the target battery has experienced thermal runaway based on the rate of change of the internal resistance of each cell. For example, based on the rate of change of the internal resistance of each cell, the mean and standard deviation of the rate of change of the internal resistance of all cells in the target battery are determined. If the rate of change of the internal resistance of at least one cell exceeds the range determined by the mean and standard deviation, then the target battery is determined to be in thermal runaway. This solves the problem of low accuracy and error-proneness in the prior art due to analysis based on pre-obtained data, thereby ensuring detection reliability. Attached Figure Description

[0036] Figure 1 This is a flowchart of a battery thermal runaway detection method provided in Embodiment 1 of the present invention;

[0037] Figure 2 This is a flowchart of a battery thermal runaway detection method provided in Embodiment 2 of the present invention;

[0038] Figure 3 This is a structural block diagram of a battery thermal runaway detection device provided in Embodiment 3 of the present invention;

[0039] Figure 4 This is a schematic diagram of the structure of an electronic device provided in Embodiment 4 of the present invention. Detailed Implementation

[0040] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0041] Example 1

[0042] Figure 1 This is a flowchart of a battery thermal runaway detection method provided in Embodiment 1 of the present invention. This embodiment is applicable to thermal runaway detection of batteries such as lithium batteries. The method can be executed by a battery thermal runaway detection device, which can be integrated into an electronic device such as a computer. The device can be implemented in the form of software and / or hardware. The method specifically includes the following steps:

[0043] Step 110: Obtain the remaining power of each cell in the target battery; wherein, the target battery includes multiple cells.

[0044] For example, the target battery is a lithium battery. The remaining charge of each cell in the target battery is relatively similar, and the remaining charge of each cell in the target battery can be obtained by a charge acquisition device. The battery thermal runaway detection device is electrically connected to the charge acquisition device to obtain the remaining charge of each cell in the target battery.

[0045] Step 120: When the remaining power is higher than the preset power threshold, detect the internal resistance of the battery cell based on the preset period and preset frequency.

[0046] For example, the preset charge threshold is 50%, the preset period ranges from 5s to 200s, and the preset frequency is greater than 1Hz. When the remaining charge of the battery cell is higher than the preset charge threshold, the internal resistance of the battery cell is detected at the preset frequency every preset period. The internal resistance of the battery cell can be detected by an EIS (Electrochemical Impedance Spectroscopy) tester. The battery thermal runaway detection device is electrically connected to the EIS tester to obtain the internal resistance of the battery cell.

[0047] Step 130: Determine the rate of change of the internal resistance of the battery cell based on the internal resistance of the battery cell and the preset period.

[0048] Specifically, the internal resistance of the current cycle of the battery cell is subtracted from the internal resistance of the previous cycle to obtain the difference value. The ratio of the difference value to the preset cycle is used as the internal resistance change rate of the battery cell. The process of determining the internal resistance change rate of other battery cells is the same, thereby obtaining the internal resistance change rate of each battery cell.

[0049] Step 140: Determine whether the target battery has experienced thermal runaway based on the rate of change of internal resistance.

[0050] Specifically, based on the rate of change of internal resistance of each cell, the mean S_agv and standard deviation S_std of the rate of change of internal resistance of all cells in the target battery over two cycles (the current cycle and the previous cycle) are determined. If the rate of change of internal resistance of at least one cell exceeds the range determined by the mean and standard deviation, such as being greater than S_agv+nS_std or less than S_agv-nS_std (where n is a positive integer greater than or equal to 3, and S_agv-nS_std is less than zero), then the target battery is determined to be in thermal runaway.

[0051] It should be noted that the values ​​of each preset value in this embodiment are only illustrative and can be determined according to actual detection needs, and are not limited here.

[0052] The battery thermal runaway detection method provided in this embodiment determines whether the target battery has experienced thermal runaway based on the rate of change of internal resistance of each cell. For example, it determines the mean and standard deviation of the sum of the rates of change of internal resistance of all cells in the target battery based on the rate of change of internal resistance of each cell. If the rate of change of internal resistance of at least one cell exceeds the range determined by the mean and standard deviation, then the target battery is determined to be in thermal runaway. This solves the problem of low accuracy and error-proneness in the prior art due to analysis based on pre-obtained data, thereby ensuring the reliability of detection.

[0053] Example 2

[0054] Figure 2This is a flowchart of a battery thermal runaway detection method provided in Embodiment 2 of the present invention. This embodiment is applicable to the detection of thermal runaway in batteries such as lithium batteries. The method can be executed by a battery thermal runaway detection device, which can be integrated into an electronic device such as a computer. The device can be implemented in the form of software and / or hardware. The method specifically includes the following steps:

[0055] Step 210: Obtain the remaining power of each cell in the target battery; wherein, the target battery includes multiple cells.

[0056] For example, the target battery is a lithium battery. The remaining charge of each cell in the target battery is relatively similar, and the remaining charge of each cell in the target battery can be obtained by a charge acquisition device. The battery thermal runaway detection device is electrically connected to the charge acquisition device to obtain the remaining charge of each cell in the target battery.

[0057] Step 220: When the remaining power is higher than the preset power threshold, detect the internal resistance of the battery cell based on the preset period and preset frequency.

[0058] For example, the preset charge threshold is 50%, the preset period ranges from 5s to 200s, and the preset frequency is greater than 1Hz. When the remaining charge of the battery cell is higher than the preset charge threshold, the internal resistance of the battery cell is detected at the preset frequency every preset period. The internal resistance of the battery cell can be detected by an EIS (Electrochemical Impedance Spectroscopy) tester. The battery thermal runaway detection device is electrically connected to the EIS tester to obtain the internal resistance of the battery cell.

[0059] Step 230: Subtract the internal resistance of the cell in the current cycle from the internal resistance of the previous cycle to obtain the difference value.

[0060] Specifically, the internal resistance of the cell in the current cycle is subtracted from the internal resistance of the cell in the previous cycle to obtain the difference value. Similarly, the internal resistance of the cell in each cycle (except the first cycle) is subtracted from the internal resistance of the cell in the previous cycle to obtain the difference value. For example, the internal resistance R in the k-th cycle... k The internal resistance R of the cell in the (k-1)th cycle k-1 Take the difference to get the difference value, where k is a positive integer greater than or equal to 2.

[0061] Step 240: Use the ratio of the difference to the preset period as the rate of change of the cell's internal resistance.

[0062] For example, the rate of change of internal resistance S k =(R k -R k-1 ) / T, where T is the preset period.

[0063] Step 250: Based on the rate of change of internal resistance, determine the mean S_agv and standard deviation S_std of the rate of change of internal resistance of all cells in the target battery.

[0064] Specifically, based on the rate of change of internal resistance of each cell in the target battery, such as the rate of change of internal resistance in the current cycle and the previous cycle, the mean S_agv and standard deviation S_std of the rate of change of internal resistance of all cells in the target battery in the two cycles of the current cycle and the previous cycle are calculated. The specific calculation process of the mean and standard deviation can be referred to in mathematics for the calculation of the mean and standard deviation, and will not be elaborated here.

[0065] Step 260: If at least one cell has an internal resistance change rate greater than S_agv+nS_std or less than S_agv-nS_std in m consecutive cycles, then the target battery is determined to be in thermal runaway, where m is a positive integer.

[0066] Where n is a positive integer greater than or equal to 3, and S_agv-nS_std is less than zero, if there exists at least one cell whose internal resistance change rate S is obtained in m consecutive times (m is at least 1). k If the value is greater than S_agv+nS_std or less than S_agv-nS_std, then the target battery is determined to be in thermal runaway.

[0067] Additionally, if the standard deviation S_std is less than a preset threshold, such as 0.1 mΩ / ms, it indicates that the target battery is functioning normally and has not experienced thermal runaway. Once thermal runaway of the target battery is confirmed, an early warning notification is issued to alert relevant personnel to take appropriate measures in a timely manner.

[0068] It should be noted that the values ​​of the parameters in this embodiment are only for illustrative purposes and can be determined according to actual testing needs, and are not limited here.

[0069] The battery thermal runaway detection method provided in this embodiment includes: acquiring the remaining charge of each cell in the target battery; wherein the target battery includes multiple cells; when the remaining charge is higher than a preset charge threshold, detecting the internal resistance of the cell based on a preset period and a preset frequency; subtracting the internal resistance of the cell in the current period from the internal resistance of the previous period to obtain the difference value; using the ratio of the difference value to the preset period as the internal resistance change rate of the cell; determining the mean S_agv and standard deviation S_std of the internal resistance change rates of all cells in the target battery according to the internal resistance change rate; if at least one cell has an internal resistance change rate greater than S_agv+nS_std or less than S_agv-nS_std in m consecutive cycles, then the target battery is determined to be in thermal runaway, where m is a positive integer. The battery thermal runaway detection method provided in this embodiment determines the mean S_agv and standard deviation S_std of the internal resistance change rate of all cells in the target battery based on the internal resistance change rate of each cell. If the internal resistance change rate of at least one cell is greater than S_agv+nS_std or less than S_agv-nS_std (n is a positive integer greater than or equal to 3, and S_agv-nS_std is less than zero), then the target battery is determined to be in thermal runaway. This solves the problem of low accuracy and error-proneness in the prior art due to analysis based on pre-obtained data, thereby ensuring the reliability of detection.

[0070] Example 3

[0071] Figure 3 This is a structural block diagram of a battery thermal runaway detection device provided in Embodiment 3 of the present invention. (Reference) Figure 3 The battery thermal runaway detection device includes: a power acquisition module 310, an internal resistance detection module 320, a rate determination module 330, and a thermal runaway determination module 340. The power acquisition module 310 acquires the remaining power of each cell in the target battery; the target battery includes multiple cells. The internal resistance detection module 320 detects the internal resistance of the cells based on a preset period and a preset frequency when the remaining power exceeds a preset power threshold. The rate determination module 330 determines the rate of change of the internal resistance of the cells based on the internal resistance and the preset period. The thermal runaway determination module 340 determines whether the target battery has experienced thermal runaway based on the rate of change of internal resistance.

[0072] In one implementation, the thermal runaway determination module includes:

[0073] The mean determination unit is used to determine the mean S_agv and standard deviation S_std of the rate of change of internal resistance of all cells in the target battery based on the rate of change of internal resistance.

[0074] The thermal runaway determination unit is used to determine that the target battery is in thermal runaway if the rate of change of internal resistance of at least one cell is greater than S_agv+nS_std or less than S_agv-nS_std, where n is a positive integer greater than or equal to 3 and S_agv-nS_std is less than zero.

[0075] Based on the above implementation, the thermal runaway determination unit is specifically used to determine that the target battery is in thermal runaway if at least one cell has an internal resistance change rate greater than S_agv+nS_std or less than S_agv-nS_std in m consecutive cycles, where m is a positive integer.

[0076] Optionally, the rate determination module 330 includes:

[0077] The difference determination unit is used to calculate the difference between the internal resistance of the cell in the current cycle and the internal resistance in the previous cycle.

[0078] The rate determination unit is used to determine the ratio of the difference to the preset period as the rate of change of the internal resistance of the battery cell.

[0079] Optionally, the above-mentioned battery thermal runaway detection device further includes a prompting module, which is used to issue an early warning prompt for the target battery thermal runaway after the thermal runaway determination module 340 determines that the target battery is in thermal runaway.

[0080] The battery thermal runaway detection device provided in this embodiment belongs to the same inventive concept as the battery thermal runaway detection method provided in any embodiment of the present invention, and has corresponding beneficial effects. For technical details not covered in this embodiment, please refer to the battery thermal runaway detection method provided in any embodiment of the present invention.

[0081] Example 4

[0082] Figure 4 This is a schematic diagram of the structure of an electronic device provided in Embodiment 4 of the present invention. Figure 4 A block diagram is shown of an exemplary electronic device 412 suitable for implementing embodiments of the present invention. Figure 4 The electronic device 412 shown is merely an example and should not impose any limitation on the functionality and scope of use of the embodiments of the present invention.

[0083] like Figure 4 As shown, electronic device 412 is represented in the form of a general-purpose device. The components of electronic device 412 may include, but are not limited to: one or more processors 416, storage device 428, and bus 418 connecting different system components (including storage device 428 and processor 416).

[0084] Bus 418 represents one or more of several bus architectures, including a memory device bus or memory device processor, a peripheral bus, a graphics acceleration port, a processor, or a local bus using any of the various bus architectures. Examples of these architectures include, but are not limited to, the Industry Subversive Alliance (ISA) bus, the Micro Channel Architecture (MAC) bus, the Enhanced ISA bus, the Video Electronics Standards Association (VESA) local bus, and the Peripheral Component Interconnect (PCI) bus.

[0085] Electronic device 412 typically includes a variety of computer system readable media. These media can be any available media that can be accessed by electronic device 412, including volatile and non-volatile media, removable and non-removable media.

[0086] Storage device 428 may include computer system readable media in the form of volatile memory, such as random access memory (RAM) 430 and / or cache memory 432. Electronic device 412 may further include other removable / non-removable, volatile / non-volatile computer system storage media. By way of example only, storage system 434 may be used to read and write non-removable, non-volatile magnetic media (… Figure 4 Not shown; usually referred to as a "hard drive"). Although Figure 4 Not shown, a disk drive for reading and writing to a removable non-volatile disk (e.g., a "floppy disk") and an optical disc drive for reading and writing to a removable non-volatile optical disc (e.g., a Compact Disc Read-Only Memory, CD-ROM), a Digital Video Disc Read-Only Memory, DVD-ROM, or other optical media may be provided. In these cases, each drive may be connected to bus 418 via one or more data media interfaces. Storage device 428 may include at least one program product having a set (e.g., at least one) of program modules configured to perform the functions of the embodiments of the present invention.

[0087] A program / utility 440 having a set (at least one) of program modules 442 may be stored in, for example, a storage device 428. Such program modules 442 include, but are not limited to, an operating system, one or more application programs, other program modules, and program data. Each or some combination of these examples may include an implementation of a network environment. Program modules 442 typically perform the functions and / or methods described in the embodiments of the present invention.

[0088] Electronic device 412 can also communicate with one or more external devices 414 (e.g., keyboard, pointing terminal, display 424, etc.), and with one or more terminals that enable a user to interact with the electronic device 412, and / or with any terminal that enables the electronic device 412 to communicate with one or more other computing terminals (e.g., network card, modem, etc.). This communication can be performed via input / output (I / O) interface 422. Furthermore, electronic device 412 can also communicate with one or more networks (e.g., local area network (LAN), wide area network (WAN), and / or public networks, such as the Internet) via network adapter 420. Figure 4 As shown, network adapter 420 communicates with other modules of electronic device 412 via bus 418. It should be understood that, although not shown in the figure, other hardware and / or software modules may be used in conjunction with electronic device 412, including but not limited to: microcode, terminal drivers, redundant processors, external disk drive arrays, Redundant Arrays of Independent Disks (RAID) systems, tape drives, and data backup storage systems.

[0089] The processor 416 executes various functional applications and data processing by running programs stored in the storage device 428, such as implementing the battery thermal runaway detection method provided in the embodiments of the present invention, the method comprising:

[0090] Obtain the remaining charge of each cell in the target battery; wherein the target battery comprises multiple cells;

[0091] When the remaining power is higher than the preset power threshold, the internal resistance of the battery cell is detected based on the preset period and preset frequency;

[0092] The rate of change of the internal resistance of the battery cell is determined based on the internal resistance of the battery cell and the preset period.

[0093] Based on the rate of change of internal resistance, determine whether the target battery has experienced thermal runaway.

[0094] Example 5

[0095] Embodiment 5 of the present invention provides a computer-readable storage medium storing a computer program thereon. When executed by a processor, the program implements the battery thermal runaway detection method provided in the embodiments of the present invention, the method comprising:

[0096] Obtain the remaining charge of each cell in the target battery; wherein the target battery comprises multiple cells;

[0097] When the remaining power is higher than the preset power threshold, the internal resistance of the battery cell is detected based on the preset period and preset frequency;

[0098] The rate of change of the internal resistance of the battery cell is determined based on the internal resistance of the battery cell and the preset period.

[0099] Based on the rate of change of internal resistance, determine whether the target battery has experienced thermal runaway.

[0100] The computer storage medium of this invention can be any combination of one or more computer-readable media. A computer-readable medium can be a computer-readable signal medium or a computer-readable storage medium. A computer-readable storage medium can be, for example,—but not limited to—an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples (a non-exhaustive list) of computer-readable storage media include: an electrical connection having one or more wires, a portable computer disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage device, magnetic storage device, or any suitable combination thereof. In this document, a computer-readable storage medium can be any tangible medium that contains or stores a program that can be used by or in conjunction with an instruction execution system, apparatus, or device.

[0101] Computer-readable signal media may include data signals propagated in baseband or as part of a carrier wave, carrying 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. Computer-readable signal media may also be any computer-readable medium other than computer-readable storage media, capable of sending, propagating, or transmitting programs for use by or in connection with an instruction execution system, apparatus, or device.

[0102] Program code contained on a computer-readable medium may be transmitted using any suitable medium, including—but not limited to—wireless, wire, optical fiber, RF, etc., or any suitable combination thereof.

[0103] Computer program code for performing the operations of this invention can be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, and C++, as well as conventional procedural programming languages ​​such as "C" or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or terminal. In cases involving remote computers, the remote computer can 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 can be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0104] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, combinations, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A method for detecting battery thermal runaway, characterized in that, include: Obtain the remaining charge of each cell in the target battery; wherein the target battery includes multiple cells; When the remaining power is higher than a preset power threshold, the internal resistance of the battery cell is detected based on a preset period and a preset frequency; The rate of change of the internal resistance of the battery cell is determined based on the internal resistance of the battery cell and the preset period. Based on the rate of change of internal resistance, determine whether the target battery has experienced thermal runaway.

2. The method for detecting battery thermal runaway according to claim 1, characterized in that, Determining the rate of change of the internal resistance of the battery cell based on its internal resistance and the preset period includes: The difference is obtained by subtracting the internal resistance of the cell in the current cycle from the internal resistance in the previous cycle. The ratio of the difference to the preset period is used as the rate of change of the internal resistance of the battery cell.

3. The method for detecting battery thermal runaway according to claim 1, characterized in that, The rate of change of internal resistance is used to determine whether the target battery has experienced thermal runaway, including: Based on the internal resistance change rate, determine the mean S_agv and standard deviation S_std of the internal resistance change rate of all cells in the target battery; If the rate of change of internal resistance of at least one cell is greater than S_agv+nS_std or less than S_agv-nS_std, then the target battery is determined to be in thermal runaway, where n is a positive integer greater than or equal to 3, and S_agv-nS_std is less than zero.

4. The method for detecting battery thermal runaway according to claim 3, characterized in that, The step of determining thermal runaway of the target battery if the internal resistance change rate of at least one cell is greater than S_agv+nS_std or less than S_agv-nS_std includes: If at least one cell has an internal resistance change rate greater than S_agv+nS_std or less than S_agv-nS_std in m consecutive cycles, then the target battery is determined to be in thermal runaway, where m is a positive integer.

5. The method for detecting battery thermal runaway according to claim 1, characterized in that, After determining that the target battery is in thermal runaway, the process includes: Issue an early warning notification regarding the thermal runaway of the target battery.

6. The method for detecting battery thermal runaway according to claim 1, characterized in that, The target battery is a lithium battery, the preset cycle ranges from 5s to 200s, and the preset frequency is greater than 1Hz.

7. A battery thermal runaway detection device, characterized in that, include: A power acquisition module is used to acquire the remaining power of each cell in the target battery; wherein, the target battery includes multiple cells; An internal resistance detection module is used to detect the internal resistance of the battery cell based on a preset period and a preset frequency when the remaining power is higher than a preset power threshold. A rate determination module is used to determine the rate of change of the internal resistance of the battery cell based on the internal resistance of the battery cell and the preset period. The thermal runaway determination module is used to determine whether the target battery has experienced thermal runaway based on the rate of change of internal resistance.

8. The battery thermal runaway detection device according to claim 7, characterized in that, The thermal runaway determination module includes: The mean determination unit is used to determine the mean S_agv and standard deviation S_std of the internal resistance change rate of all cells in the target battery based on the internal resistance change rate. The thermal runaway determination unit is used to determine that the target battery is in thermal runaway if the rate of change of internal resistance of at least one cell is greater than S_agv+nS_std or less than S_agv-nS_std, where n is a positive integer greater than or equal to 3 and S_agv-nS_std is less than zero.

9. A device, characterized in that, The device includes: One or more processors; Storage device for storing one or more programs; When the one or more programs are executed by the one or more processors, the one or more processors implement the battery thermal runaway detection method as described in any one of claims 1-6.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When executed by the processor, the program implements the battery thermal runaway detection method as described in any one of claims 1-6.

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