Battery pack thermal runaway early warning method, apparatus, device, and medium

Abstract

A battery pack thermal runaway early warning method, device, equipment and medium are disclosed, the method comprising: determining a target temperature sensor with a fault; determining a final temperature detection value of the target temperature sensor according to temperature detection values of other temperature sensors located on the same isothermal surface as the target temperature sensor, the target temperature sensor and the other temperature sensors are used to detect the temperature of the battery cell; based on a plurality of temperature detection values including the final temperature detection value of the target temperature sensor, the battery pack thermal runaway early warning is carried out. The present application effectively reduces the false alarm risk and improves the early warning accuracy. The problem that the detection value of the loose temperature sensor in the prior art cannot truly reflect the actual temperature of the battery cell is solved, and the problem of false alarm of thermal runaway early warning is solved.

Description

Technical Field

[0001] This application relates to the field of battery pack thermal runaway early warning technology, specifically to a battery pack thermal runaway early warning method, device, equipment, and medium. Background Technology

[0002] In the field of pure electric vehicles, cell temperature has a direct impact on battery pack performance and is one of the important reference parameters for the BMS (Battery Management System) to provide early warning of battery pack thermal runaway. Therefore, the accuracy of the detected cell temperature plays a crucial role in early warning of battery pack thermal runaway. Accurate cell temperatures can truly reflect the actual temperature situation of the battery pack, providing early warning of thermal runaway and protecting passengers. Conversely, inaccurate cell temperatures will trigger abnormal BMS warnings, causing the vehicle to suddenly depressurize, leading to panic and significant distrust among passengers, ultimately reducing product competitiveness.

[0003] Currently, most battery cell temperature sampling solutions rely on real-time sampling using temperature sensors (such as negative temperature coefficient temperature sensors, NTC). However, these temperature sensors are glued to the battery cells. As the vehicle operates, some temperature sensors may become loose. The readings from these loose temperature sensors cannot accurately reflect the actual temperature of the battery cell, leading to abnormal cell temperature detection and potentially triggering false alarms for thermal runaway warnings.

[0004] In view of this, the present invention is hereby proposed. Summary of the Invention

[0005] The following provides a brief overview of one or more aspects to offer a basic understanding of them. This overview is not an exhaustive summary of all conceived aspects, nor is it intended to identify key or decisive elements of all aspects, nor to define the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form to prepare for the more detailed descriptions that follow.

[0006] In view of the problem that the temperature sensor with loose bonding in the prior art cannot accurately reflect the actual temperature of the battery cell, resulting in false alarms for thermal runaway warning, this application provides a battery pack thermal runaway warning method, which effectively reduces the risk of false alarms and improves the accuracy of warning.

[0007] In a first aspect, the present invention provides a method for early warning of thermal runaway in a battery pack, comprising the following steps:

[0008] Identify the faulty target temperature sensor;

[0009] The final temperature detection value of the target temperature sensor is determined based on the temperature detection values ​​of other temperature sensors located on the same isothermal surface as the target temperature sensor. The target temperature sensor and the other temperature sensors are all used to detect the cell temperature of the battery pack.

[0010] Battery pack thermal runaway early warning is based on multiple temperature detection values, including the final temperature detection value of the target temperature sensor.

[0011] Furthermore, the isothermal surface includes a horizontal isothermal surface parallel to the length direction of the battery module, and / or a vertical isothermal surface perpendicular to the length direction of the battery module. Each horizontal isothermal surface corresponds to each battery module, and each vertical isothermal surface corresponds to each battery module.

[0012] Furthermore, if the target temperature sensor is located on two different isothermal surfaces simultaneously, determining the final temperature detection value of the target temperature sensor based on the temperature detection values ​​of other temperature sensors located on the same isothermal surface as the target temperature sensor includes:

[0013] The first temperature value is determined based on the temperature detection values ​​of other temperature sensors located on the same first isothermal surface as the target temperature sensor;

[0014] The second temperature value is determined based on the temperature detection values ​​of other temperature sensors located on the same second isothermal surface as the target temperature sensor;

[0015] The final temperature detection value is determined based on the first temperature value and / or the second temperature value.

[0016] Furthermore, determining the first temperature value based on the temperature detection values ​​of other temperature sensors located on the same first isothermal surface as the target temperature sensor includes:

[0017] The temperature value detected by any one of the other temperature sensors located on the same first isothermal surface is determined as the first temperature value.

[0018] Alternatively, the temperature detection value of a preset temperature sensor among other temperature sensors located on the same first isothermal surface can be determined as the first temperature value.

[0019] Alternatively, the average of the temperature readings from the other temperature sensors located on the same first isothermal surface can be used to determine the first temperature value.

[0020] Furthermore, determining the final temperature detection value based on the first temperature value and / or the second temperature value includes:

[0021] The first temperature value or the second temperature value is determined as the final temperature detection value;

[0022] Alternatively, the average of the first temperature value and the second temperature value can be determined as the final temperature detection value.

[0023] Furthermore, the determination of the faulty target temperature sensor includes:

[0024] If the actual temperature detected by a temperature sensor exceeds the first threshold, then the temperature sensor is determined to be a faulty target temperature sensor.

[0025] Alternatively, the faulty target temperature sensor can be identified based on the temperature readings of all temperature sensors on the same isothermal surface.

[0026] Furthermore, the method of providing early warning of battery pack thermal runaway based on multiple temperature detection values, including the final temperature detection value from the target temperature sensor, includes:

[0027] If any of the multiple temperature detection values ​​exceeds the second threshold, a battery pack thermal runaway warning will be issued.

[0028] Secondly, the present invention also provides a battery pack thermal runaway early warning device, comprising:

[0029] The first determining module is used to determine the target temperature sensor that is faulty;

[0030] The second determining module is used to determine the final temperature detection value of the target temperature sensor based on the temperature detection values ​​of other temperature sensors located on the same isothermal surface as the target temperature sensor. The target temperature sensor and the other temperature sensors are all used to detect the cell temperature of the battery pack.

[0031] The early warning module is used to provide early warning of battery pack thermal runaway based on multiple temperature detection values, including the final temperature detection value of the target temperature sensor.

[0032] Thirdly, the present invention also provides an electronic device, the electronic device comprising:

[0033] One or more processors;

[0034] Storage device for storing one or more programs;

[0035] When the one or more programs are executed by the one or more processors, the one or more processors implement the battery pack thermal runaway early warning method as described above.

[0036] Fourthly, the present invention also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the battery pack thermal runaway early warning method as described above.

[0037] This invention discloses a battery pack thermal runaway early warning method. When a faulty target temperature sensor is identified, the final temperature detection value of the target temperature sensor is determined based on the temperature detection values ​​of other temperature sensors located on the same isothermal surface as the target temperature sensor. Both the target temperature sensor and the other temperature sensors are used to detect the cell temperature of the battery pack. Therefore, a battery pack thermal runaway early warning is generated based on multiple temperature detection values, including the final temperature detection value of the target temperature sensor. This effectively reduces the risk of false alarms and improves the accuracy of the early warning. It solves the problem in existing technologies where the detection values ​​of loosely bonded temperature sensors cannot accurately reflect the actual temperature of the battery cells, thus resolving the problem of false alarms in thermal runaway early warnings. Attached Figure Description

[0038] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1 This is a flowchart illustrating a battery pack thermal runaway early warning method provided in an embodiment of the present invention.

[0040] Figure 2 This is a schematic diagram of the design of an isothermal surface of a battery pack provided in an embodiment of the present invention;

[0041] Figure 3 This is a schematic diagram of the structure of a battery pack thermal runaway early warning device provided in an embodiment of the present invention;

[0042] Figure 4 This is a schematic diagram of the structure of an electronic device according to an embodiment of the present invention. Detailed Implementation

[0043] The present application 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, only the parts relevant to the invention are shown in the accompanying drawings.

[0044] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0045] The battery pack thermal runaway early warning method proposed in this application is applicable to scenarios where thermal runaway early warning is based on the actual temperature of the cells within the battery pack. The battery pack thermal runaway early warning method can be executed by a battery pack thermal runaway early warning device, which can be composed of software and / or hardware and can be integrated into the vehicle's battery management system (BMS).

[0046] Figure 1 This is a flowchart illustrating a battery pack thermal runaway early warning method proposed in this application, as shown below. Figure 1 As shown, the battery pack thermal runaway early warning method includes the following steps:

[0047] S110. Identify the faulty target temperature sensor.

[0048] Temperature sensors that cannot accurately detect the actual temperature are considered faulty target temperature sensors. For example, in battery pack applications, temperature sensors are usually glued to the surface of each cell within the battery pack. As the vehicle operates, the glue between some temperature sensors and the cell surface may loosen. Loose temperature sensors cannot accurately detect the actual temperature of the corresponding cell surface, and therefore, these types of temperature sensors are considered faulty target temperature sensors.

[0049] In some embodiments, determining the faulty target temperature sensor includes:

[0050] If the actual temperature reading of a temperature sensor exceeds a first threshold, then that temperature sensor is determined to be a faulty target temperature sensor; that is, if the actual temperature reading of a temperature sensor is high, then that temperature sensor is considered a faulty target temperature sensor. This is because in actual projects, it has been found that if the adhesive connecting a temperature sensor to the battery cell is loose, the actual temperature reading of that temperature sensor will be abnormally high. Based on this characteristic, if the actual temperature reading of a temperature sensor exceeds the first threshold, then that temperature sensor is determined to be a faulty target temperature sensor.

[0051] In other embodiments, the determination of a faulty target temperature sensor includes:

[0052] The faulty target temperature sensor can be identified by analyzing the temperature readings of all temperature sensors on the same isothermal surface. For example, if the average temperature reading of all temperature sensors on the same isothermal surface is 40°C, and the actual temperature reading of a temperature sensor on that surface is 80°C, significantly higher than the average of 40°C, then that temperature sensor is considered the faulty target temperature sensor. Furthermore, the faulty target temperature sensor can also be identified by analyzing the temperature readings of several adjacent temperature sensors on the same isothermal surface. For instance, if the actual temperature readings of three adjacent temperature sensors on the same isothermal surface are 38°C, 38.1°C, and 60°C respectively, then the temperature sensor corresponding to 60°C can be identified as the faulty target temperature sensor.

[0053] S120. Determine the final temperature detection value of the target temperature sensor based on the temperature detection values ​​of other temperature sensors located on the same isothermal surface as the target temperature sensor. The target temperature sensor and the other temperature sensors are all used to detect the cell temperature of the battery pack.

[0054] This requires using algorithms to assign a temperature detection value close to the actual temperature to the target temperature sensor, in order to solve the problem of false alarms caused by battery pack thermal runaway due to the target temperature sensor. To address this, this application proposes the concept of an isothermal surface. If a temperature sensor on the isothermal surface fails, the temperature detection value of another temperature sensor on the isothermal surface is used to replace the malfunctioning sensor's value, thereby preventing false alarms due to battery pack thermal runaway.

[0055] Specifically, thermal management simulation of the battery pack is first performed to determine the number and location of isothermal surfaces, followed by isothermal surface design. Then, several temperature sensors (NTCs) are installed on each isothermal surface. Generally, NTCs are integrated with the battery pack's FPC or FFC, and the number and location of NTCs correspond to different FPCs or FFCs. Since there are many isothermal surfaces within the battery pack, many types of FPCs or FFCs will appear, which is not conducive to industrial implementation. Therefore, the technical solution of this application adopts approximate isothermal surfaces, meaning that surfaces within the T±5℃ range are considered the same isothermal surface. Thus, there are two main directions of isothermal surfaces within the battery pack. In this application's technical solution, the isothermal surfaces are selected at the middle position of the battery cells, namely, a horizontal isothermal surface parallel to the length direction of the battery pack module and a vertical isothermal surface perpendicular to the length direction of the battery pack module. Assuming there are M battery modules in the battery pack, each battery module has one FPC or FFC, and each FPC or FFC has n NTCs. Therefore, there are M horizontal isothermal surfaces and n vertical isothermal surfaces. Thus, the number of isothermal surfaces in the battery pack is equal to the number of NTCs, i.e., n×M. If one of the n NTCs on a horizontal isothermal surface malfunctions, its temperature value can be replaced by the temperature values ​​of the remaining (n-1) NTCs or (M-1) NTCs. Similarly, if one of the M NTCs on a vertical isothermal surface malfunctions, its temperature value can be replaced by the temperature values ​​of (n-1) or (M-1) NTCs from a specific module. The specific replacement method can be determined based on thermal management simulation results to improve the accuracy of the replacement.

[0056] Taking 24 NTCs as an example, see below. Figure 2The diagram shows a design of a battery pack isotherm, comprising 6 horizontal isotherms and 13 vertical isotherms. NTC1, NTC2, NTC3, NTC4, and NTC5 are disposed on horizontal isotherm 1; NTC6, NTC7, and NTC8 are disposed on horizontal isotherm 2; NTC9, NTC10, NTC11, NTC12, and NTC13 are disposed on horizontal isotherm 3; NTC14, NTC15, and NTC16 are disposed on horizontal isotherm 4; NTC17, NTC18, NTC19, NTC20, and NTC21 are disposed on horizontal isotherm 5; and NTC22, NTC23, and NTC24 are disposed on horizontal isotherm 6. NTC5, NTC13, and NTC21 are provided on vertical isotherm 1; NTC6, NTC14, and NTC22 are provided on vertical isotherm 2; NTC4, NTC12, and NTC20 are provided on vertical isotherm 4; NTC7, NTC15, and NTC23 are provided on vertical isotherm 6; NTC3, NTC11, and NTC19 are provided on vertical isotherm 7; NTC2, NTC10, and NTC18 are provided on vertical isotherm 10; NTC8, NTC16, and NTC24 are provided on vertical isotherm 12; and NTC1, NTC9, and NTC17 are provided on vertical isotherm 13.

[0057] In actual temperature detection, the BMS uses a daisy-chain method to obtain temperature values ​​sequentially from NTC1 to NTC24, and then responds accordingly based on the temperature values ​​detected by the NTCs. In existing technology, if an NTC malfunctions, for example, if NTC11 reports a temperature T... NTC11 The temperature is 100℃, while the temperature threshold Tmax for thermal runaway warning is 70℃, i.e., T NTC11 >Tmax, the BMS will request the VDC to urgently reduce the high voltage, and the VDC will immediately reduce the high voltage and issue an audible and visual signal to remind passengers to evacuate the vehicle immediately.

[0058] In this embodiment, if NTC11 malfunctions, its temperature detection value will be discarded, and replaced by the temperature detection values ​​of NTC9, NTC10, NTC12, and / or NTC13 on the horizontal isothermal surface 3, or by the temperature detection values ​​of NTC3 and / or NTC19 on the vertical isothermal surface 7. In other words, the temperature detection values ​​of other temperature sensors on the isothermal surface will be sent to the BMS instead of NTC11's temperature detection value. Obviously, this will result in duplicate temperature detection signals.

[0059] More preferably, the average temperature readings (Taverage) of the other temperature sensors on the isothermal surface (excluding the malfunctioning NTC11) can be used instead of the NTC11 temperature readings when sending them to the BMS. Specifically, the average temperature readings (Taverage3) of the other temperature sensors on the horizontal isothermal surface 3 (excluding the malfunctioning NTC11) can be sent to the BMS. NTC9 +T NTC10 +T NTC12 +T NTC13 ) / 4, or replace the temperature detection value of NTC11 with the average value of the temperature detection values ​​of other temperature sensors on the vertical isothermal surface 7, excluding the abnormal NTC11, and send it to the BMS. The average value of the temperature detection values ​​of other temperature sensors on the vertical isothermal surface 7, excluding the abnormal NTC11, is Taverage7 = (T NTC3 +T NTC19 This can improve the computational efficiency of BMS and avoid false NTC anomalies.

[0060] More preferably, the average temperature readings of all NTCs (excluding the anomalous NTC) on the horizontal and vertical isothermal surfaces can be used to replace the temperature readings of the anomalous NTC, i.e., using Taverage = (T NTC9 +T NTC10 +T NTC12 +T NTC13 +T NTC3 +T NTC19 The temperature detection value of abnormal NTC is replaced by ) / 6 to improve the accuracy of the replacement value of abnormal NTC temperature detection value, thereby improving the accuracy of battery pack thermal runaway warning and reducing the probability of false alarm.

[0061] More preferably, the temperature readings of NTCs at several key points of interest on the isothermal surface can be selected to replace the temperature readings of abnormal NTCs. When an NTC becomes abnormal, the temperature reading of the NTC at a key point of interest is used instead of the abnormal NTC's temperature reading. Assuming NTC5, NTC6, NTC12, NTC15, NTC19, and NTC24 are selected as key points of interest, if NTC11 becomes abnormal, the average temperature of the key points of interest, Taverage = (T... NTC5 +T NTC6 +T NTC12 +T NTC15 +T NTC19 +T NTC24 The temperature detection value of NTC11 is sent to BMS instead of NTC11, which makes the calculation efficiency of BMS higher and avoids false alarms of NTC abnormality.

[0062] Ideally, if several selected key points of interest malfunction, temperature readings from other key points of interest can be used instead. For example, if NTC12 malfunctions, the temperature reading from one of NTC5, NTC6, NTC15, NTC19, or NTC24 (e.g., NTC6) can be used instead of the NTC12 reading when sending it to the BMS. This improves the BMS's calculation efficiency and avoids false alarms due to NTC malfunctions. Alternatively, if NTC6 malfunctions, the temperature reading from NTC15 can be used instead of the NTC6 reading when sending it to the BMS; this only requires pre-setting the sending order.

[0063] In general, the isothermal surface includes a horizontal isothermal surface parallel to the length direction of the battery module, and / or a vertical isothermal surface perpendicular to the length direction of the battery module. Each horizontal isothermal surface corresponds to each battery module, and each vertical isothermal surface corresponds to each battery module.

[0064] If the target temperature sensor is located on two different isothermal surfaces simultaneously, determining the final temperature detection value of the target temperature sensor based on the temperature detection values ​​of other temperature sensors located on the same isothermal surface as the target temperature sensor includes:

[0065] A first temperature value is determined based on the temperature detection values ​​of other temperature sensors located on the same first isothermal surface as the target temperature sensor; a second temperature value is determined based on the temperature detection values ​​of other temperature sensors located on the same second isothermal surface as the target temperature sensor; and a final temperature detection value is determined based on the first temperature value and / or the second temperature value.

[0066] The step of determining the first temperature value based on the temperature detection values ​​of other temperature sensors located on the same first isothermal surface as the target temperature sensor includes:

[0067] The temperature value detected by any one of the other temperature sensors located on the same first isothermal surface is determined as the first temperature value; or, the temperature value detected by a preset temperature sensor among the other temperature sensors located on the same first isothermal surface is determined as the first temperature value; or, the average value of the temperature values ​​detected by the other temperature sensors located on the same first isothermal surface is determined as the first temperature value.

[0068] Determining the final temperature detection value based on the first temperature value and / or the second temperature value includes: determining the first temperature value or the second temperature value as the final temperature detection value; or, determining the average value of the first temperature value and the second temperature value as the final temperature detection value.

[0069] S130. A battery pack thermal runaway early warning is issued based on multiple temperature detection values, including the final temperature detection value of the target temperature sensor.

[0070] Specifically, if any of the multiple temperature detection values ​​exceeds the second threshold, a battery pack thermal runaway warning will be issued.

[0071] One current approach to electric vehicle battery pack thermal runaway warning strategies involves the Battery Management System (BMS) collecting several key parameters of the battery pack for analysis. These parameters primarily include the maximum cell temperature (Tmax), maximum temperature difference (Tmax-Tmin), temperature rise rate, minimum voltage (Vmin), and pressure rise rate. Clearly, the accuracy of these battery parameters plays a crucial role in thermal runaway warnings. Accurate battery pack parameters accurately reflect the actual condition of the battery pack, providing early warnings of thermal runaway and protecting passengers. Conversely, inaccurate battery pack parameters will trigger abnormal BMS warnings, causing the vehicle to suddenly depressurize, leading to panic and significant passenger distrust, ultimately reducing product competitiveness. Among these parameters, temperature signals are particularly prone to anomalies. Currently, the industry primarily monitors battery pack temperature by collecting the temperature of the NTCs on the cells. The NTC arrangement should reflect the maximum and minimum temperatures of the battery pack. The BMS collects temperature data in a daisy-chain pattern, sequentially collecting data from NTC1 to NTC18 (assuming the battery pack has 18 NTCs). When the BMS detects a temperature exceeding the NTC thermal runaway temperature threshold, it issues a thermal runaway warning signal. Since the connection between the NTCs and cells is currently mainly achieved through adhesive bonding, it's easy for individual NTCs to become loose. A loose NTC will report an abnormally high temperature to the BMS, leading to incorrect judgments. Therefore, this embodiment addresses this by setting up an isothermal surface. The temperature detection values ​​of other NTCs on the isothermal surface are used to replace the temperature detection values ​​of abnormal NTCs, or the calculated values ​​of normal NTCs on the isothermal surface are used to replace the temperature detection values ​​of abnormal NTCs.

[0072] The battery pack thermal runaway early warning method provided in this application effectively reduces the risk of false alarms and improves the accuracy of early warnings. It solves the problem in existing technologies where loosely bonded temperature sensors cannot accurately reflect the actual temperature of the battery cells, thus resolving the issue of false alarms in thermal runaway early warnings. It avoids BMS false alarms caused by NTC anomalies, preventing passenger panic and improving product competitiveness; it improves BMS calculation efficiency; it proposes a solution that can still transmit NTC temperatures even if individual NTCs are abnormal, avoiding the scrapping of the entire battery pack and saving significant costs; the technology that replaces abnormal NTC temperatures only requires slight modifications to the BMS strategy without increasing costs, making it highly feasible.

[0073] Figure 3 This is a schematic diagram of a battery pack thermal runaway early warning device provided in an embodiment of the present invention. This device can be integrated into the vehicle's BMS. Figure 3 As shown, the device includes: a first determining module 310, a second determining module 320, and an early warning module 330.

[0074] The first determining module 310 is used to determine the target temperature sensor that has a fault; the second determining module 320 is used to determine the final temperature detection value of the target temperature sensor based on the temperature detection values ​​of other temperature sensors located on the same isothermal surface as the target temperature sensor, wherein the target temperature sensor and the other temperature sensors are all used to detect the cell temperature of the battery pack; and the early warning module 330 is used to provide an early warning of battery pack thermal runaway based on multiple temperature detection values, including the final temperature detection value of the target temperature sensor.

[0075] Furthermore, the isothermal surface includes a horizontal isothermal surface parallel to the length direction of the battery module, and / or a vertical isothermal surface perpendicular to the length direction of the battery module. Each horizontal isothermal surface corresponds to each battery module, and each vertical isothermal surface corresponds to each battery module.

[0076] Furthermore, if the target temperature sensor is located on two different isothermal surfaces simultaneously, the second determining module 320 includes: a first determining unit, configured to determine a first temperature value based on the temperature detection values ​​of other temperature sensors located on the same first isothermal surface as the target temperature sensor; a second determining unit, configured to determine a second temperature value based on the temperature detection values ​​of other temperature sensors located on the same second isothermal surface as the target temperature sensor; and a third determining unit, configured to determine the final temperature detection value based on the first temperature value and / or the second temperature value.

[0077] Furthermore, the first determining unit is specifically used to: determine the temperature detection value of any one of the other temperature sensors located on the same first isothermal surface as the first temperature value; or, determine the temperature detection value of a preset temperature sensor among the other temperature sensors located on the same first isothermal surface as the first temperature value; or, determine the average value of the temperature detection values ​​of the other temperature sensors located on the same first isothermal surface as the first temperature value.

[0078] Furthermore, the third determining unit is specifically used to: determine the first temperature value or the second temperature value as the final temperature detection value; or, determine the average value of the first temperature value and the second temperature value as the final temperature detection value.

[0079] Furthermore, the first determining module 310 is specifically used to: determine that the temperature sensor is a faulty target temperature sensor if the actual temperature detection value of a temperature sensor exceeds a first threshold; or, determine the faulty target temperature sensor based on the temperature detection values ​​of all temperature sensors on the same isothermal surface.

[0080] Furthermore, the early warning module 330 is specifically used to: if any of the plurality of temperature detection values ​​exceeds the second threshold, then issue an early warning for battery pack thermal runaway.

[0081] The battery pack thermal runaway early warning device disclosed in this invention effectively reduces the risk of false alarms and improves the accuracy of early warnings. It solves the problem in existing technologies where loosely bonded temperature sensors cannot accurately reflect the actual temperature of the battery cells, thus resolving the issue of false alarms in thermal runaway warnings. It avoids BMS false alarms caused by NTC anomalies, preventing passenger panic and improving product competitiveness; it improves BMS calculation efficiency; it proposes a solution that can still transmit NTC temperatures even if individual NTCs are abnormal, avoiding the scrapping of the entire battery pack and saving significant costs; the technology that replaces abnormal NTC temperatures only requires slight modifications to the BMS strategy without increasing costs, making it highly feasible.

[0082] The battery pack thermal runaway early warning device provided in this disclosure can execute the steps in the battery pack thermal runaway early warning method provided in this disclosure method embodiment, and has the execution steps and beneficial effects, which will not be repeated here.

[0083] Figure 4 This is a schematic diagram of the structure of an electronic device according to an embodiment of this disclosure. See below for details. Figure 4 It shows a schematic diagram of a structure suitable for implementing the electronic device 500 in the embodiments of this disclosure. Figure 4 The electronic device shown is merely an example and should not be construed as limiting the functionality and scope of the embodiments disclosed herein.

[0084] like Figure 4 As shown, the electronic device 500 may include a processing device (e.g., a central processing unit, a graphics processor, etc.) 501, which can perform various appropriate actions and processes to implement the methods of the embodiments described herein, based on a program stored in a read-only memory (ROM) 502 or a program loaded from a storage device 508 into a random access memory (RAM) 503. The RAM 503 also stores various programs and data required for the operation of the electronic device 500. The processing device 501, ROM 502, and RAM 503 are interconnected via a bus 504. An input / output (I / O) interface 505 is also connected to the bus 504.

[0085] In particular, according to embodiments of this disclosure, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, embodiments of this disclosure include a computer program product comprising a computer program carried on a non-transitory computer-readable medium, the computer program containing program code for performing the methods shown in the flowcharts, thereby implementing the battery pack thermal runaway early warning method as described above. In such embodiments, the computer program can be downloaded and installed from a network via a communication device 509, or installed from a storage device 508, or installed from a ROM 502. When the computer program is executed by the processing device 501, it performs the functions defined in the methods of embodiments of this disclosure.

[0086] It should be noted that the computer-readable medium described in this disclosure can be a computer-readable signal medium or a computer-readable storage medium, or any combination thereof. 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 of a computer-readable storage medium may include, but are not limited to: 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 disclosure, a computer-readable storage medium can be any tangible medium containing or storing a program that can be used by or in connection with an instruction execution system, apparatus, or device. In this disclosure, a computer-readable signal medium can include a data signal propagated in baseband or as part of a carrier wave, carrying computer-readable program code. Such propagated data signals can take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. A computer-readable signal medium can be any computer-readable medium other than a computer-readable storage medium, which can send, propagate, or transmit a program for use by or in connection with an instruction execution system, apparatus, or device. The program code contained on the computer-readable medium can be transmitted using any suitable medium, including but not limited to: wires, optical fibers, RF (radio frequency), etc., or any suitable combination thereof.

[0087] The aforementioned computer-readable medium may be included in the aforementioned electronic device; or it may exist independently and not assembled into the electronic device. The aforementioned computer-readable medium carries one or more programs that, when executed by the electronic device, cause the electronic device to: determine a faulty target temperature sensor; determine a final temperature detection value of the target temperature sensor based on temperature detection values ​​from other temperature sensors located on the same isothermal surface as the target temperature sensor, wherein the target temperature sensor and the other temperature sensors are all used to detect the cell temperature of the battery pack; and provide a battery pack thermal runaway early warning based on multiple temperature detection values, including the final temperature detection value of the target temperature sensor.

[0088] Optionally, when one or more of the above-described procedures are executed by the electronic device, the electronic device may also execute other steps described in the above embodiments.

[0089] In the context of this disclosure, a machine-readable medium can be a tangible medium that may contain or store a program for use by or in conjunction with an instruction execution system, apparatus, or device. A machine-readable medium can be a machine-readable signal medium or a machine-readable storage medium. A machine-readable medium can be, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatus, or devices, or any suitable combination of the foregoing. More specific examples of machine-readable storage media include electrical connections based on one or more wires, portable computer disks, hard disks, 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 devices, magnetic storage devices, or any suitable combination of the foregoing.

[0090] The above description is merely a preferred embodiment of this disclosure and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of this disclosure is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the above-described concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features disclosed in this disclosure that have similar functions.

[0091] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the methods and core ideas of this application. The above descriptions are merely preferred embodiments of this application. It should be noted that due to the limitations of written expression, while there are objectively infinite specific structures, those skilled in the art can make several improvements, modifications, or changes without departing from the principles of this invention, and can also combine the above technical features in an appropriate manner. These improvements, modifications, changes, or combinations, or the direct application of the inventive concept and technical solution to other situations without modification, should all be considered within the scope of protection of this application.

Claims

1. A method for early warning of thermal runaway in a battery pack, characterized in that, include: Identify the faulty target temperature sensor; The final temperature detection value of the target temperature sensor is determined based on the temperature detection values ​​of other temperature sensors located on the same isothermal surface as the target temperature sensor. The target temperature sensor and the other temperature sensors are all used to detect the cell temperature of the battery pack. Battery pack thermal runaway early warning is based on multiple temperature detection values, including the final temperature detection value of the target temperature sensor. If the target temperature sensor is located on two different isothermal surfaces, the step of determining the final temperature detection value of the target temperature sensor based on the temperature detection values ​​of other temperature sensors located on the same isothermal surface as the target temperature sensor includes: determining a first temperature value based on the temperature detection values ​​of other temperature sensors located on the same first isothermal surface as the target temperature sensor; A second temperature value is determined based on the temperature detection values ​​of other temperature sensors located on the same second isothermal surface as the target temperature sensor; the final temperature detection value is determined based on the first temperature value and the second temperature value.

2. The battery pack thermal runaway early warning method according to claim 1, characterized in that, The isothermal surface includes a horizontal isothermal surface parallel to the length direction of the battery module, and / or a vertical isothermal surface perpendicular to the length direction of the battery module. Each horizontal isothermal surface corresponds to each battery module, and each vertical isothermal surface corresponds to each battery module.

3. The battery pack thermal runaway early warning method according to claim 1, characterized in that, The step of determining the first temperature value based on the temperature detection values ​​of other temperature sensors located on the same first isothermal surface as the target temperature sensor includes: The temperature value detected by any one of the other temperature sensors located on the same first isothermal surface is determined as the first temperature value. Alternatively, the temperature detection value of a preset temperature sensor among other temperature sensors located on the same first isothermal surface can be determined as the first temperature value. Alternatively, the average of the temperature readings from the other temperature sensors located on the same first isothermal surface can be used to determine the first temperature value.

4. The battery pack thermal runaway early warning method according to claim 1, characterized in that, Determining the final temperature detection value based on the first temperature value and the second temperature value includes: The average of the first temperature value and the second temperature value is determined as the final temperature detection value.

5. The battery pack thermal runaway early warning method according to claim 1, characterized in that, The target temperature sensor identified as faulty includes: If the actual temperature detected by a temperature sensor exceeds the first threshold, then the temperature sensor is determined to be a faulty target temperature sensor. Alternatively, the faulty target temperature sensor can be identified based on the temperature readings of all temperature sensors on the same isothermal surface.

6. The battery pack thermal runaway early warning method according to any one of claims 1-5, characterized in that, The method of providing early warning of battery pack thermal runaway based on multiple temperature detection values, including the final temperature detection value from the target temperature sensor, includes: If any of the multiple temperature detection values ​​exceeds the second threshold, a battery pack thermal runaway warning will be issued.

7. A battery pack thermal runaway early warning device, characterized in that, include: The first determining module is used to determine the target temperature sensor that is faulty; The second determining module is used to determine the final temperature detection value of the target temperature sensor based on the temperature detection values ​​of other temperature sensors located on the same isothermal surface as the target temperature sensor. The target temperature sensor and the other temperature sensors are all used to detect the cell temperature of the battery pack. If the target temperature sensor is located on two different isothermal surfaces simultaneously, the second determining module includes: a first determining unit, used to determine a first temperature value based on the temperature detection values ​​of other temperature sensors located on the same first isothermal surface as the target temperature sensor; a second determining unit, used to determine a second temperature value based on the temperature detection values ​​of other temperature sensors located on the same second isothermal surface as the target temperature sensor; and a third determining unit, used to determine the final temperature detection value based on the first temperature value and the second temperature value. The early warning module is used to provide early warning of battery pack thermal runaway based on multiple temperature detection values, including the final temperature detection value of the target temperature sensor.

8. An electronic device, characterized in that, The electronic 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 pack thermal runaway early warning method as described in any one of claims 1-6.

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

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