Battery pack thermal runaway early warning method, device and equipment and storage medium

Abstract

The invention discloses a battery pack thermal runaway early warning method, device and equipment and a storage medium, and the method comprises the steps: obtaining a cell voltage sampling parameter which is a parameter obtained when the cell voltage of a battery pack is sampled; determining a target temperature sensor with induction failure according to the cell voltage sampling parameter, wherein the target temperature sensor is used for detecting the cell temperature of the battery pack; and performing battery pack thermal runaway early warning according to the positions and the number of the target temperature sensors. According to the technical scheme of the invention, the method can improve the recognition accuracy of the sensors which are loosened in adhesion, reduces the false alarm risk of the thermal runaway of the battery pack, and improves the early warning accuracy of the thermal runaway fault.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of battery pack thermal runaway warning, and specifically to a battery pack thermal runaway warning method, device, equipment and computer-readable storage medium. Background Art

[0002] In the field of pure electric vehicles, the cell temperature has a direct impact on the performance of the battery pack and is one of the important reference parameters for the BMS (Battery Management System) to warn of thermal runaway of the battery pack. Therefore, the authenticity of the detected cell temperature plays a key role in the thermal runaway warning of the battery pack. The real cell temperature can truly reflect the actual temperature of the battery pack and can warn of thermal runaway, thereby protecting passengers; on the contrary, an unreal cell temperature will cause an abnormal warning of the BMS, causing the vehicle to urgently lower the high voltage, and the passengers will rush to get off the car, which will inevitably cause panic and great distrust among passengers, thereby reducing the competitiveness of the product.

[0003] At present, most battery cell temperature sampling solutions are based on real-time sampling using temperature sensors (such as negative temperature coefficient temperature sensors NTC). The temperature sensors are bonded to the battery cells by glue. As the vehicle runs, some temperature sensors may become loose, and the detection value of the loose temperature sensor cannot truly reflect the actual temperature of the battery cell, resulting in abnormal battery cell temperature detection, which in turn triggers a false alarm of thermal runaway warning. Summary of the invention

[0004] In view of the above problems, the embodiments of the present application provide a battery pack thermal runaway warning method, device, equipment and computer-readable storage medium, which are used to solve the problem of false alarm of battery pack thermal runaway pre-alarm due to loose adhesion of temperature sensors in vehicle battery packs, resulting in the temperature detection value not being able to truly reflect the actual temperature of the battery cell, thereby reducing the risk of false alarm of battery pack thermal runaway and improving the accuracy of thermal runaway fault warning.

[0005] According to one aspect of an embodiment of the present application, a battery pack thermal runaway warning method is provided, the method comprising:

[0006] Obtaining a cell voltage sampling parameter, wherein the cell voltage sampling parameter is a parameter obtained when sampling the cell voltage of the battery pack;

[0007] Determine a target temperature sensor for sensing failure according to the cell voltage sampling parameter, wherein the target temperature sensor is used to detect the cell temperature of the battery pack;

[0008] Based on the location and number of target temperature sensors, a thermal runaway warning for the battery pack is issued.

[0009] In an optional exemplary embodiment, determining a target temperature sensor for sensing failure according to a cell voltage sampling parameter includes:

[0010] Detecting whether the cell voltage sampling line is offline within a preset time period according to the cell voltage sampling parameter;

[0011] If the cell voltage sampling line is not disconnected within the preset time, the temperature sensor that meets the induction failure condition at the current time is determined as the target temperature sensor;

[0012] If the cell voltage sampling line is offline within a preset time, the temperature sensor that meets the induction failure requirement at the current time and the temperature sensor that meets the induction failure requirement within the preset time are both determined as target temperature sensors.

[0013] In an optional exemplary embodiment, when the temperature sensor meets the low-temperature outlier failure or the high-temperature outlier failure, the temperature sensor is determined as an inductively failed temperature sensor.

[0014] In an optional exemplary embodiment, the temperature sensor satisfies high temperature outlier failure, further comprising:

[0015] When the detected temperature of the temperature sensor meets the high temperature failure condition, and the duration of meeting the high temperature failure condition exceeds or is equal to the preset high temperature failure duration, the temperature sensor is confirmed as a temperature sensor with high temperature outlier failure; wherein,

[0016] The high temperature failure condition is that the difference between the detection temperature of the temperature sensor and the detection average temperature is greater than or equal to the first temperature value, and the absolute value of the difference between the detection temperatures of adjacent temperature sensors of the temperature sensor is greater than the second temperature value; the detection average temperature is the average value of the detection temperatures of all temperature sensors.

[0017] In an optional exemplary embodiment, the temperature sensor satisfies low temperature outlier failure, further comprising:

[0018] When the detected temperature of the temperature sensor meets the low temperature failure condition, and the duration of meeting the low temperature failure condition exceeds the preset low temperature failure duration, the temperature sensor is confirmed as a temperature sensor with low temperature outlier failure; wherein,

[0019] The low-temperature failure condition is that the difference between the detected average temperature and the detected temperature of the temperature sensor is greater than or equal to a third temperature value; the detected average temperature is the average value of the detected temperatures of all temperature sensors.

[0020] In an optional exemplary embodiment, the step of providing a battery pack thermal runaway warning according to the position and number of the target temperature sensors further includes:

[0021] Positionally matching the position of the target temperature sensor with the position of the stored temperature sensor;

[0022] If the temperature sensors in the same isothermal section are all target temperature sensors, a thermal runaway warning for the battery pack is issued;

[0023] If the temperature sensors of the same isothermal section are a preset number of target temperature sensors, and the number of the target temperature sensors exceeds the preset runaway warning number, a battery pack thermal runaway warning is performed; wherein,

[0024] The isothermal section includes horizontal isothermal surfaces parallel to the length direction of the battery module, each of the horizontal isothermal surfaces corresponds one-to-one to each battery module, and / or the isothermal section includes vertical isothermal surfaces perpendicular to the length direction of the battery module, each of the vertical isothermal surfaces corresponds one-to-one to each battery module.

[0025] In an optional exemplary embodiment, after matching the position of the target temperature sensor with the position of the stored temperature sensor, the method further includes:

[0026] If the temperature sensors of the same isothermal section are a preset number of target temperature sensors, and the number of the target temperature sensors does not exceed the preset out-of-control warning number, the step of matching the positions of the target temperature sensors with the positions of the stored temperature sensors is continued.

[0027] According to another aspect of an embodiment of the present application, a battery pack thermal runaway warning device is provided, comprising:

[0028] A voltage sampling module, used to obtain a cell voltage sampling parameter, wherein the cell voltage sampling parameter is a parameter obtained when sampling the cell voltage of the battery pack;

[0029] A target determination module, used to determine a target temperature sensor for sensing failure according to a cell voltage sampling parameter, wherein the target temperature sensor is used to detect the cell temperature of the battery pack;

[0030] The early warning module is used to provide early warning of thermal runaway of the battery pack based on the location and number of target temperature sensors.

[0031] According to another aspect of an embodiment of the present application, a battery pack thermal runaway warning device is provided, comprising:

[0032] Controller;

[0033] The memory is used to store one or more programs. When the one or more programs are executed by the controller, the controller implements the above-mentioned battery pack thermal runaway warning method.

[0034] According to another aspect of an embodiment of the present application, a computer-readable storage medium is provided, in which a computer program is stored. The computer program includes at least one executable instruction. When the executable instruction is run on a battery pack thermal runaway warning device / vehicle, the battery pack thermal runaway warning device / vehicle performs the operation of the battery pack thermal runaway warning method as described above.

[0035] The battery pack thermal runaway warning method of the embodiment of the present application obtains the sampling parameters of the battery cell voltage, determines the target temperature sensor that senses the failure, and determines the actual battery cell temperature based on the position and number of the target temperature sensors, and performs a battery pack thermal runaway warning. This solves the problem of the temperature detection value failing to truly reflect the actual temperature of the battery cell due to loose adhesion of the temperature sensor in the vehicle battery pack, and causes false alarms for the battery pack thermal runaway pre-alarm. It can improve the accuracy of identifying loose adhesion sensors, reduce the risk of false alarms for battery pack thermal runaway, and improve the accuracy of thermal runaway fault warnings.

[0036] The above description is only an overview of the technical solution of the embodiment of the present application. In order to more clearly understand the technical means of the embodiment of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the embodiment of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The accompanying drawings are only used to illustrate the embodiments and are not to be considered as limiting the present application. In addition, the same reference symbols are used to represent the same components throughout the accompanying drawings. In the accompanying drawings:

[0038] Figure 1 A schematic diagram showing a flow chart of an embodiment of a battery pack thermal runaway warning method provided in the present application;

[0039] Figure 2 Shows this application Figure 1 A schematic diagram of a flow chart of an embodiment of step 120;

[0040] Figure 3 Shows this application Figure 1 A flowchart of an embodiment of step 130;

[0041] Figure 4 An example diagram showing the location of a temperature sensor stored in the battery pack thermal runaway warning method provided by the present application; Figure 5 A schematic structural diagram of an embodiment of a battery pack thermal runaway warning device provided in the present application is shown; Figure 6 A schematic structural diagram of an embodiment of a battery pack thermal runaway warning device provided in the present application is shown. DETAILED DESCRIPTION

[0042] Here, exemplary embodiments will be described in detail, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are only examples of devices and methods consistent with some aspects of the present application as detailed in the attached claims.

[0043] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities may be implemented in software form, or 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 only exemplary and do not necessarily include all the contents and operations / steps, nor must they be executed in the order described. For example, some operations / steps can be decomposed, and some operations / steps can be combined or partially combined, so the actual execution order may change according to actual conditions.

[0045] The term "multiple" as used in this application refers to two or more than two. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the related objects are in an "or" relationship.

[0046] Figure 1 The flowchart of the first embodiment of the battery pack thermal runaway warning method of the present application is shown, and the method is executed by the battery pack thermal runaway warning device or. Figure 1 As shown, the method comprises the following steps:

[0047] Step 110: Acquire a cell voltage sampling parameter, where the cell voltage sampling parameter is a parameter acquired when sampling the cell voltage of the battery pack;

[0048] Among them, in order to reduce the risk of false alarm of battery pack thermal runaway and improve the accuracy of thermal runaway fault warning, the battery pack thermal runaway warning device or battery management system obtains the battery cell voltage sampling parameters, and the battery pack thermal runaway warning device establishes a warning task.

[0049] Among them, the battery pack thermal runaway warning device can be integrated into the vehicle's battery management system or into the vehicle control system. The battery pack thermal runaway warning device can be composed of software and / or hardware. The battery cell voltage sampling parameter is a parameter obtained when the battery pack thermal runaway warning device or the battery pack thermal runaway warning device detects the battery cell voltage of the battery pack, that is, the voltage value of each battery cell of the battery pack.

[0050] Step 120: determining a target temperature sensor for sensing failure according to a cell voltage sampling parameter, wherein the target temperature sensor is used to detect a cell temperature of the battery pack;

[0051] Among them, after the battery pack thermal runaway warning device or the battery management system obtains the battery cell voltage sampling parameters, the battery pack thermal runaway warning device or the battery management system determines the target temperature sensor that senses failure based on the obtained battery cell voltage sampling parameters.

[0052] Among them, the temperature sensor of the battery pack is usually glued to the surface of each battery cell in the battery pack. As the vehicle runs, the glue between some temperature sensors and the surface of the battery cell will become loose. The loose temperature sensor cannot accurately detect the actual temperature of the corresponding battery cell surface. Therefore, this type of temperature sensor is a faulty target temperature sensor.

[0053] Please continue to read Figure 2 As shown, step 120 determines the target temperature sensor that senses failure according to the cell voltage sampling parameter, which may include:

[0054] Step 121: detecting whether the cell voltage sampling line is offline within a preset time period according to the cell voltage sampling parameter;

[0055] Among them, after obtaining the cell voltage sampling parameters, the battery pack thermal runaway warning device or battery management system detects whether the cell voltage sampling line is offline within a preset time length according to the cell voltage sampling parameters. That is, after the battery pack thermal runaway warning device or battery management system obtains the cell voltage sampling parameters, the battery pack thermal runaway warning device or battery management system determines whether the cell voltage corresponding to the temperature sensor is less than the offline voltage, where the offline voltage can be 0V, or 0.1, 0.2, 0.05, 0.06 or 0.25V. The preset time length can be 3min, 6min, 8min, 9 or 10min.

[0056] Step 122: If the cell voltage sampling line is not disconnected within the preset time, the temperature sensor that meets the induction failure condition at the current time is determined as the target temperature sensor;

[0057] Among them, after the battery pack thermal runaway warning device or battery management system obtains the battery cell voltage sampling parameters, when the battery pack thermal runaway warning device or battery management system detects that there is no offline failure in the battery cell voltage sampling line within the preset time length, the temperature sensor that meets the induction failure at the current time is determined as the target temperature sensor. The preset time length can be 3min, 6min, 8min, 9 or 10min. That is, when the battery pack thermal runaway warning device or battery management system determines that the battery cell voltages corresponding to the temperature sensors are all greater than the offline voltage within the preset time length, the temperature sensor that meets the induction failure at the current time is determined as the target temperature sensor.

[0058] When the temperature sensor meets the low-temperature outlier failure or high-temperature outlier failure criteria, the temperature sensor is determined as a temperature sensor with inductive failure.

[0059] Wherein, the step of the temperature sensor meeting the high temperature outlier failure includes: when the detected temperature of the temperature sensor meets the high temperature failure condition and the duration of meeting the high temperature failure condition exceeds the preset high temperature failure duration, the temperature sensor is confirmed as a temperature sensor with high temperature outlier failure, and the detected average temperature is the average value of the detected temperatures of all temperature sensors; the high temperature failure condition is that the difference between the detected temperature of the temperature sensor and the detected average temperature is greater than or equal to the first temperature value and the absolute value of the difference between the detected temperatures of adjacent temperature sensors of the temperature sensor is greater than the second temperature value. Wherein, the first temperature value can be 6°C, 7°C, 8°C, 9°C, 10°C, 11°C, 12°C, 13°C, 14°C or 15°C. The second temperature value can be 3°C, 4°C, 5°C, 6°C, 7°C, 8°C, 9°C or 10°C. For example, when the detection temperature (Tn) of a temperature sensor (NTC) satisfies Tn-Tavg≥10℃&max(Tx1-Tx2)≥6℃, and the time for which the temperature sensor (NTC) satisfies the condition of Tn-Tavg≥10℃&max(Tx1-Tx2)≥6℃ is greater than or equal to 4s, the temperature sensor is a high-temperature outlier failure temperature sensor. Tavg is the average detection temperature, and Tx1 and TX2 are the detection temperatures of adjacent temperature sensors at the current time.

[0060] The step of the temperature sensor meeting the low temperature outlier failure includes: when the detected temperature of the temperature sensor meets the low temperature failure condition and the duration of meeting the low temperature failure condition exceeds the preset low temperature failure duration, the temperature sensor is confirmed as a temperature sensor with low temperature outlier failure, the detected average temperature is the average value of the detected temperatures of all temperature sensors; the low temperature failure condition is that the difference between the detected average temperature and the detected temperature of the temperature sensor is greater than or equal to a third temperature value. The third temperature value can be 10°C, 11°C, 12°C, 13°C, 14°C, 15°C, 16°C, 17°C, 18°C, 19°C or 20°C. For example, when the detected temperature (Tn) of a certain temperature sensor (NTC) meets Tavg-Tn≥15°C, and the duration of the temperature sensor (NTC) meeting the condition of Tavg-Tn≥15°C is greater than or equal to 4s, the temperature sensor is a low temperature outlier failure temperature sensor. Wherein, Tavg is the detected average temperature, and Tx1 and TX2 are the detected temperatures of adjacent temperature sensors at the current time.

[0061] Step 123: If the cell voltage sampling line is offline within the preset time, the temperature sensor that meets the sensing failure requirement at the current time and the temperature sensor that meets the sensing failure requirement within the preset time are both determined as target temperature sensors.

[0062] Among them, after the battery pack thermal runaway warning device or battery management system obtains the battery cell voltage sampling parameters, when the battery pack thermal runaway warning device or battery management system detects that the battery cell voltage sampling line has a disconnection failure within the preset time length, the temperature sensor that meets the induction failure at the current time and the temperature sensor that meets the induction failure within the preset time length are determined as the target temperature sensor. That is, when the battery pack thermal runaway warning device or battery management system determines that the battery cell voltage corresponding to the temperature sensor is less than or equal to the disconnection voltage, the temperature sensor that meets the induction failure at the current time is determined as the target temperature sensor. For example, if 5 minutes ago, a battery cell voltage sampling line disconnection failure occurred in the driving cycle before the battery pack thermal runaway warning device or the battery management system detected it, and now the temperature sensor meets the sensing failure conditions, and the temperature sensor has a temperature outlier within 5 minutes but now returns to a normal temperature sensor (NTC), then this sensor is determined as the target temperature sensor; for another example, 5 minutes ago, the temperature of the temperature sensor first had a temperature outlier, and now the battery pack thermal runaway warning device or the battery management system detects that the battery cell voltage sampling line disconnection failure occurred in the driving cycle, then this sensor is also determined as the target temperature sensor.

[0063] Step 130: Perform a battery pack thermal runaway warning according to the location and number of the target temperature sensors;

[0064] Among them, after the battery pack thermal runaway warning device or battery management system determines all the target temperature sensors, it will perform a battery pack thermal runaway warning based on the location and number of the target temperature sensors. Figure 3 As shown, step 130 performs a battery pack thermal runaway warning according to the location and number of the target temperature sensors, which may include:

[0065] Step 131: Matching the position of the target temperature sensor with the position of the stored temperature sensor;

[0066] After determining all target temperature sensors, the battery pack thermal runaway warning device or battery management system matches the positions of the target temperature sensors with the positions of the stored temperature sensors; for example, the positions of the temperature sensors stored in the battery pack thermal runaway warning device or battery management system are as follows: Figure 4 As shown in the figure, the battery pack temperature sensors can also be installed in a isothermal section with 3, 4 or 5 sensors installed.

[0067] Step 132: If the temperature sensors in the same isothermal section are all target temperature sensors, a battery pack thermal runaway warning is performed;

[0068] Among them, after the battery pack thermal runaway warning device or battery management system matches the position of the target temperature sensor with the position of the stored temperature sensor, when the battery pack thermal runaway warning device or battery management system detects that the temperature sensors of the same isothermal section are all the target temperature sensors, it is determined that the battery pack is in thermal runaway, and a battery pack thermal runaway warning is issued. For example, when all three NTCs of the same isothermal section fail, a battery pack thermal runaway warning is issued.

[0069] Step 133: If the temperature sensors of the same isothermal section are a preset number of target temperature sensors, and the number of the target temperature sensors exceeds the preset runaway warning number, a battery pack thermal runaway warning is performed.

[0070] Among them, after the battery pack thermal runaway warning device or battery management system matches the position of the target temperature sensor with the position of the stored temperature sensor, when the battery pack thermal runaway warning device or battery management system detects that the temperature sensors of the same isothermal section are a preset number of target temperature sensors, not all of them are target temperature sensors, and the number of target temperature sensors exceeds the preset runaway warning number, it is judged that the battery pack is in thermal runaway, and a battery pack thermal runaway warning is performed. The preset number of runaway warnings can be 4, 5, 6, 7, 8, 9 or 10. For example, when the battery pack thermal runaway warning device or battery management system detects that more than 6 NTCs (where any 3 NTCs are not all in the same isothermal section) have failed, a battery pack thermal runaway warning is performed.

[0071] After the position of the target temperature sensor is matched with the position of the stored temperature sensor, step 131 includes:

[0072] If there are a preset number of target temperature sensors for the temperature sensors of the same isothermal section, and the number of target temperature sensors does not exceed the preset out-of-control warning number, the step of matching the position of the target temperature sensor with the position of the stored temperature sensor is continued.

[0073] In this embodiment, after the battery pack thermal runaway warning device or battery management system matches the position of the target temperature sensor with the position of the stored temperature sensor, when the temperature sensors in the same isothermal section are a preset number of target temperature sensors and the number of target temperature sensors does not exceed the preset runaway warning number, the step of matching the position of the target temperature sensor with the position of the stored temperature sensor is continued, and no battery pack thermal runaway warning is performed.

[0074] Among them, the isothermal section 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 of the horizontal isothermal surfaces corresponds to each battery module one by one, and each of the vertical isothermal surfaces corresponds to each battery module one by one.

[0075] The present application can improve the accuracy of identifying loosely adhered sensors, reduce the risk of false alarms of battery pack thermal runaway, and improve the accuracy of thermal runaway fault warnings by obtaining battery cell voltage sampling parameters, determining target temperature sensors that sense failure, and providing battery pack thermal runaway warnings based on the locations and numbers of target temperature sensors.

[0076] The present application detects whether the cell voltage sampling line is offline within a preset time period according to the cell voltage sampling parameters; and determines the target temperature sensor when the cell voltage sampling line is not offline and when it is offline within the preset time period. The number of target temperature sensors that may have sensing failures is increased through cell voltage sampling, and the probability of an outlier temperature sensor appearing at the actual cell temperature is determined, thereby reducing the risk of false alarm of thermal runaway of the battery pack and improving the accuracy of thermal runaway fault warning.

[0077] The present application reduces the risk of false alarm of thermal runaway of the battery pack and improves the accuracy of thermal runaway fault warning by matching the position of the target temperature sensor with the position of the stored temperature sensor; and by providing a thermal runaway warning for the battery pack in two cases: when all temperature sensors in the same isothermal section are target temperature sensors and when not all are target temperature sensors.

[0078] Figure 5 The schematic diagram of the structure of an embodiment of the battery pack thermal runaway warning device of the present application is shown. Figure 5As shown, the battery pack thermal runaway warning device 300 includes: a voltage sampling module 310 , a target determination module 320 and a warning module 330 .

[0079] The voltage sampling module 310 is used to obtain a cell voltage sampling parameter, where the cell voltage sampling parameter is a parameter obtained when sampling the cell voltage of the battery pack;

[0080] A target determination module 320, for determining a target temperature sensor for sensing failure according to a cell voltage sampling parameter, wherein the target temperature sensor is used to detect the cell temperature of the battery pack;

[0081] The warning module 330 is used to provide a thermal runaway warning for the battery pack according to the location and number of the target temperature sensors.

[0082] It should be noted that the battery pack thermal runaway warning device 300 provided in the above embodiment and the battery pack thermal runaway warning method provided in the above embodiment belong to the same concept, wherein the specific manner in which each module and unit performs operations has been described in detail in the method embodiment and will not be repeated here.

[0083] The present application uses the voltage sampling module 310, the target determination module 320 and the warning module 330 to obtain the battery cell voltage sampling parameters, determine the target temperature sensor that senses failure, and issue a battery pack thermal runaway warning based on the location and number of the target temperature sensors. This can improve the accuracy of identifying loosely adhered sensors, reduce the risk of false alarms of battery pack thermal runaway, and improve the accuracy of thermal runaway fault warnings.

[0084] The present application uses a disconnected sampling detection unit, a sampling non-disconnected judgment unit, a sampling disconnected judgment unit and a failed sensor determination unit to detect whether the battery cell voltage sampling line is disconnected within a preset time period according to the battery cell voltage sampling parameters; and determines the target temperature sensor when the battery cell voltage sampling line is not disconnected and when it is disconnected within the preset time period, determines the probability of an outlier temperature sensor appearing at the actual battery cell temperature, reduces the risk of false alarm of thermal runaway of the battery pack, and improves the accuracy of thermal runaway fault warning.

[0085] Figure 6 A schematic diagram of the structure of an embodiment of the vehicle of the present application is shown, which shows a schematic diagram of the structure of a computer system of the vehicle suitable for implementing the embodiment of the present application. The specific embodiment of the present application does not limit the specific implementation of the vehicle.

[0086] See also Figure 6 As shown, the vehicle includes: a controller; a memory for storing one or more programs, which, when executed by the controller, execute the above-mentioned battery pack thermal runaway warning method.

[0087] Please continue reading Figure 6As shown, the computer system 500 of the vehicle includes a central processing unit (CPU) 501, which can perform various appropriate actions and processes according to the program stored in the read-only memory (ROM) 502 or the program loaded from the storage part 508 to the random access memory (RAM) 503, such as executing the method in the above embodiment. In RAM 503, various programs and data required for system operation are also stored. CPU 501, ROM 502 and RAM 503 are connected to each other through bus 504. Input / output (I / O) interface 505 is also connected to bus 504.

[0088] The following components are connected to the I / O interface 505: an input section 506 including a keyboard, a mouse, etc.; an output section 507 including a cathode ray tube (CRT), a liquid crystal display (LCD), etc., and a speaker, etc.; a storage section 508 including a hard disk, etc.; and a communication section 509 including a network interface card such as a LAN (Local Area Network) card, a modem, etc. The communication section 509 performs communication processing via a network such as the Internet. A drive 510 is also connected to the I / O interface 505 as needed. A removable medium 511, such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, etc., is installed on the drive 510 as needed so that a computer program read therefrom is installed into the storage section 508 as needed.

[0089] In particular, according to an embodiment of the present application, the process described above with reference to the flowchart can be implemented as a computer software program. For example, an embodiment of the present application includes a computer program product, which includes a computer program carried on a computer-readable medium, and the computer program includes a computer program for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from a network through a communication section 509, and / or installed from a removable medium 511. When the computer program is executed by a central processing unit (CPU) 501, various functions defined in the system of the present application are executed.

[0090] Another aspect of the present application further provides a computer-readable storage medium on which a computer program is stored, and when the computer program is executed by a processor, the battery pack thermal runaway warning method described above is implemented. The computer-readable storage medium may be included in the vehicle described in the above embodiment, or may exist independently without being assembled in the vehicle.

[0091] Another aspect of the present application further provides a computer program product or a computer program, which includes at least one executable instruction. When the executable instruction is executed on the battery pack thermal runaway warning device / equipment, the battery pack thermal runaway warning device / equipment executes the battery pack thermal runaway warning method as described below:

[0092] Obtaining a cell voltage sampling parameter, wherein the cell voltage sampling parameter is a parameter obtained when sampling the cell voltage of the battery pack;

[0093] Determine a target temperature sensor for sensing failure according to the cell voltage sampling parameter, wherein the target temperature sensor is used to detect the cell temperature of the battery pack;

[0094] Based on the location and number of target temperature sensors, a thermal runaway warning for the battery pack is issued.

[0095] In an optional manner, the executable instructions may also be used to enable the thermal management control device of the power battery / vehicle to perform the following operations:

[0096] Detecting whether the cell voltage sampling line is offline within a preset time period according to the cell voltage sampling parameter;

[0097] If the cell voltage sampling line is not disconnected within the preset time, the temperature sensor that meets the induction failure condition at the current time is determined as the target temperature sensor;

[0098] If the cell voltage sampling line is offline within a preset time, the temperature sensor that meets the induction failure requirement at the current time and the temperature sensor that meets the induction failure requirement within the preset time are both determined as target temperature sensors.

[0099] In an optional manner, the executable instructions may also be used to enable the thermal management control device of the power battery / vehicle to perform the following operations:

[0100] When the temperature sensor meets the low temperature outlier failure criteria or the high temperature outlier failure criteria, the temperature sensor is determined to be a temperature sensor that senses failure.

[0101] In an optional manner, the program 410 is called by the processor 402 to enable the battery pack thermal runaway warning device to perform the following operations:

[0102] When the detected temperature of the temperature sensor meets the high temperature failure condition, and the duration of meeting the high temperature failure condition exceeds or is equal to the preset high temperature failure duration, the temperature sensor is confirmed as a temperature sensor with high temperature outlier failure; wherein,

[0103] The high temperature failure condition is that the difference between the detection temperature of the temperature sensor and the detection average temperature is greater than or equal to the first temperature value, and the absolute value of the difference between the detection temperatures of adjacent temperature sensors of the temperature sensor is greater than the second temperature value; the detection average temperature is the average value of the detection temperatures of all temperature sensors.

[0104] In an optional manner, the program 410 is called by the processor 402 to enable the battery pack thermal runaway warning device to perform the following operations:

[0105] When the detected temperature of the temperature sensor meets the low temperature failure condition, and the duration of meeting the low temperature failure condition exceeds the preset low temperature failure duration, the temperature sensor is confirmed as a temperature sensor with low temperature outlier failure; wherein,

[0106] The low-temperature failure condition is that the difference between the detected average temperature and the detected temperature of the temperature sensor is greater than or equal to a third temperature value; the detected average temperature is the average value of the detected temperatures of all temperature sensors.

[0107] In an optional manner, the program 410 is called by the processor 402 to enable the battery pack thermal runaway warning device to perform the following operations:

[0108] Positionally matching the position of the target temperature sensor with the position of the stored temperature sensor;

[0109] If the temperature sensors in the same isothermal section are all target temperature sensors, a thermal runaway warning for the battery pack is issued;

[0110] If the temperature sensors in the same isothermal section are a preset number of target temperature sensors, and the number of the target temperature sensors exceeds the preset runaway warning number, a battery pack thermal runaway warning is performed.

[0111] In an optional manner, the program 410 is called by the processor 402 to enable the battery pack thermal runaway warning device to perform the following operations:

[0112] If the temperature sensors of the same isothermal section are a preset number of target temperature sensors, and the number of the target temperature sensors does not exceed the preset out-of-control warning number, then continue to perform the step of matching the position of the target temperature sensor with the position of the stored temperature sensor; wherein,

[0113] The isothermal section includes horizontal isothermal surfaces parallel to the length direction of the battery module, each of the horizontal isothermal surfaces corresponds one-to-one to each battery module, and / or the isothermal section includes vertical isothermal surfaces perpendicular to the length direction of the battery module, each of the vertical isothermal surfaces corresponds one-to-one to each battery module.

[0114] If the temperature sensors of the same isothermal section are a preset number of target temperature sensors, and the number of the target temperature sensors does not exceed the preset out-of-control warning number, then continue to perform the step of matching the position of the target temperature sensor with the position of the stored temperature sensor; wherein,

[0115] The isothermal section includes horizontal isothermal surfaces parallel to the length direction of the battery module, each of the horizontal isothermal surfaces corresponds one-to-one to each battery module, and / or the isothermal section includes vertical isothermal surfaces perpendicular to the length direction of the battery module, each of the vertical isothermal surfaces corresponds one-to-one to each battery module.

[0116] The present application detects whether the battery cell voltage sampling line is offline within a preset time period according to the battery cell voltage sampling parameters; and determines the target temperature sensor when the battery cell voltage sampling line is not offline and when it is offline within the preset time period, and determines the probability of an outlier temperature sensor appearing at the actual battery cell temperature, thereby reducing the risk of false alarm of thermal runaway of the battery pack and improving the accuracy of thermal runaway fault warning.

[0117] The present application reduces the risk of false alarm of thermal runaway of the battery pack and improves the accuracy of thermal runaway fault warning by matching the position of the target temperature sensor with the position of the stored temperature sensor; and by providing a thermal runaway warning for the battery pack in two cases: when all temperature sensors in the same isothermal section are target temperature sensors and when not all are target temperature sensors.

[0118] It should be noted that the computer-readable medium shown in the embodiment of the present application can be a computer-readable signal medium or a computer-readable storage medium or any combination of the above two. The computer-readable storage medium can be, for example, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or device, or any combination of the above. More specific examples of computer-readable storage media can 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 can be any tangible medium containing or storing a program, which can be used by an instruction execution system, device or device or used in combination with it. In the present application, a computer-readable signal medium can include a data signal propagated in a baseband or as a part of a carrier wave, wherein a computer-readable computer program is carried. Such propagated data signals may take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. Computer-readable signal media may also be any computer-readable medium other than computer-readable storage media, which may send, propagate, or transmit programs for use by or in conjunction with an instruction execution system, apparatus, or device. The computer program contained on the computer-readable medium may be transmitted using any appropriate medium, including but not limited to: wireless, wired, etc., or any suitable combination of the above.

[0119] The flowchart and block diagram in the accompanying drawings illustrate the possible architecture, functions and operations of the system, method and computer program product according to various embodiments of the present application. Wherein, each box in the flowchart or block diagram can represent a module, a program segment, or a part of the code, and the above-mentioned module, program segment, or a part of the 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 a different order from the order 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 boxes in the block diagram or flowchart can be implemented with a dedicated hardware-based system that performs a specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0120] The units involved in the embodiments described in this application may be implemented by software or hardware, and the units described may also be set in a processor. The names of these units do not, in some cases, constitute limitations on the units themselves.

[0121] According to one aspect of an embodiment of the present application, a computer system is also provided, including a central processing unit (CPU), which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM) or a program loaded from a storage portion into a random access memory (RAM), such as executing the method in the above embodiment. In RAM, various programs and data required for system operation are also stored. CPU, ROM and RAM are connected to each other via a bus. An input / output (I / O) interface is also connected to the bus.

[0122] The following components are connected to the I / O interface: an input part including a keyboard, a mouse, etc.; an output part including a cathode ray tube (CRT), a liquid crystal display (LCD), etc., and a speaker; a storage part including a hard disk, etc.; and a communication part including a network interface card such as a LAN (Local Area Network) card, a modem, etc. The communication part performs communication processing via a network such as the Internet. A drive is also connected to the I / O interface as needed. Removable media, such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, etc., are installed on the drive as needed so that the computer program read therefrom is installed into the storage part as needed.

[0123] The above content is only a preferred exemplary embodiment of the present application and is not intended to limit the implementation scheme of the present application. A person skilled in the art can easily make corresponding changes or modifications based on the main concept and spirit of the present application. Therefore, the scope of protection of the present application shall be based on the scope of protection required by the claims.

[0124] The data collection and processing in this application should be strictly in accordance with the requirements of relevant national laws and regulations when applied in practice, and the informed consent or separate consent of the personal information subject should be obtained. Subsequent data use and processing should be carried out within the scope of authorization of laws and regulations and the personal information subject.

Claims

1. A battery pack thermal runaway early warning method, characterized in that: The battery pack thermal runaway early warning method comprises: Obtaining a cell voltage sampling parameter, wherein the cell voltage sampling parameter is a parameter obtained when sampling the cell voltage of the battery pack; Determine a target temperature sensor for sensing failure according to the cell voltage sampling parameter, wherein the target temperature sensor is used to detect the cell temperature of the battery pack; Based on the location and number of target temperature sensors, a thermal runaway warning for the battery pack is issued.

2. The battery pack thermal runaway warning method according to claim 1, characterized in that: Determining a target temperature sensor for sensing failure according to a cell voltage sampling parameter further includes: Detecting whether the cell voltage sampling line is offline within a preset time period according to the cell voltage sampling parameter; If the cell voltage sampling line is not disconnected within the preset time, the temperature sensor that meets the induction failure condition at the current time is determined as the target temperature sensor; If the cell voltage sampling line is offline within a preset time, the temperature sensor that meets the induction failure requirement at the current time and the temperature sensor that meets the induction failure requirement within the preset time are both determined as target temperature sensors.

3. The battery pack thermal runaway warning method according to claim 2, characterized in that: When the temperature sensor meets the low temperature outlier failure or the high temperature outlier failure criteria, the temperature sensor is determined as an induction failure temperature sensor.

4. The battery pack thermal runaway warning method according to claim 3, characterized in that: The temperature sensor satisfies high temperature outlier failure, further comprising: When the detected temperature of the temperature sensor meets the high temperature failure condition, and the duration of meeting the high temperature failure condition exceeds or is equal to the preset high temperature failure duration, the temperature sensor is confirmed as a temperature sensor with high temperature outlier failure; wherein, The high temperature failure condition is that the difference between the detection temperature of the temperature sensor and the detection average temperature is greater than or equal to the first temperature value, and the absolute value of the difference between the detection temperatures of adjacent temperature sensors of the temperature sensor is greater than the second temperature value; the detection average temperature is the average value of the detection temperatures of all temperature sensors.

5. The battery pack thermal runaway warning method according to claim 3, characterized in that: The temperature sensor satisfies low temperature outlier failure, further comprising: When the detected temperature of the temperature sensor meets the low temperature failure condition, and the duration of meeting the low temperature failure condition exceeds the preset low temperature failure duration, the temperature sensor is confirmed as a temperature sensor with low temperature outlier failure; wherein, The low-temperature failure condition is that the difference between the detected average temperature and the detected temperature of the temperature sensor is greater than or equal to a third temperature value; the detected average temperature is the average value of the detected temperatures of all temperature sensors.

6. The battery pack thermal runaway warning method according to any one of claims 1 to 5, characterized in that: The step of providing a thermal runaway warning for the battery pack according to the position and number of the target temperature sensors further includes: Positionally matching the position of the target temperature sensor with the position of the stored temperature sensor; If the temperature sensors in the same isothermal section are all target temperature sensors, a thermal runaway warning for the battery pack is issued; If the temperature sensors of the same isothermal section are a preset number of target temperature sensors, and the number of the target temperature sensors exceeds the preset runaway warning number, a battery pack thermal runaway warning is performed; wherein, The isothermal section includes horizontal isothermal surfaces parallel to the length direction of the battery module, each of the horizontal isothermal surfaces corresponds one-to-one to each battery module, and / or the isothermal section includes vertical isothermal surfaces perpendicular to the length direction of the battery module, each of the vertical isothermal surfaces corresponds one-to-one to each battery module.

7. The battery pack thermal runaway warning method according to claim 6, characterized in that: After matching the position of the target temperature sensor with the position of the stored temperature sensor, the method further includes: If the temperature sensors of the same isothermal section are a preset number of target temperature sensors, and the number of the target temperature sensors does not exceed the preset out-of-control warning number, the step of matching the positions of the target temperature sensors with the positions of the stored temperature sensors is continued.

8. A battery pack thermal runaway warning device, characterized in that: The battery pack thermal runaway warning device comprises: A voltage sampling module, used to obtain a cell voltage sampling parameter, wherein the cell voltage sampling parameter is a parameter obtained when sampling the cell voltage of the battery pack; A target determination module, used to determine a target temperature sensor for sensing failure according to a cell voltage sampling parameter, wherein the target temperature sensor is used to detect the cell temperature of the battery pack; The early warning module is used to provide early warning of thermal runaway of the battery pack based on the location and number of target temperature sensors.

9. A battery pack thermal runaway warning device, characterized in that: include: Controller; A memory for storing one or more programs. When the one or more programs are executed by the controller, the controller implements the battery pack thermal runaway warning method as described in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that: The storage medium stores a computer program, which includes at least one executable instruction. When the executable instruction is run on the battery pack thermal runaway warning device / apparatus, the battery pack thermal runaway warning device / apparatus performs the operation of the battery pack thermal runaway warning method as described in any one of claims 1 to 7.

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