Power battery system temperature abnormality monitoring method, system and storage medium

Abstract

The present invention relates to a method, system and storage medium for monitoring abnormal temperature of a power battery system. The method comprises the following steps: obtaining the temperature value of a preset sampling point of a power battery to be tested and the temperature value of each electronic component sampling point; constructing a temperature mapping relationship between the temperature value of the preset sampling point and each electronic component sampling point that satisfies preset conditions, and obtaining a first judgment temperature value of each electronic component sampling point; constructing a gradient temperature field of the power battery to be tested, and obtaining a second judgment temperature value of each electronic component sampling point according to the gradient temperature field; judging the temperature abnormality of each electronic component according to the first judgment temperature value and the second judgment temperature value of each electronic component sampling point. The full range of temperature monitoring of the power battery system can be achieved, abnormal temperature points can be discovered in a timely and rapid manner, and the corresponding electronic component positions can be locked, and over-temperature protection measures can be taken at the first time to prevent the occurrence of safety accidents.

Description

Technical Field

[0001] The present invention relates to the technical field of power battery temperature monitoring, and in particular to a method, system and storage medium for monitoring abnormal temperature of a power battery system. Background Art

[0002] With the rapid growth of the new energy vehicle market, safety incidents such as "automobile spontaneous combustion" and "battery fire" occur frequently, so power batteries need to obtain technical innovations in safety management performance. The number of temperature sampling circuits in existing new energy vehicle battery systems is limited. Usually, about 30 collection points are selected to monitor the temperature of the entire power battery system. After the data of the collected temperature points are sent to the battery management unit, the battery management unit monitors the temperature of the battery system. Therefore, this temperature collection method cannot obtain the temperature changes of each electronic component in real time. In severe cases, it will cause the temperature abnormalities to not be detected in time, causing a series of safety problems. Summary of the invention

[0003] The present invention provides a method, system and storage medium for monitoring abnormal temperature of a power battery system, which can achieve full coverage of the temperature monitoring of the power battery system, can promptly and quickly discover abnormal temperature points, and lock the corresponding electronic component positions, so as to take over-temperature protection measures in the first place and prevent the occurrence of safety accidents.

[0004] In a first aspect, the present invention provides a method for monitoring abnormal temperature of a power battery system, comprising the following steps:

[0005] Obtain the temperature value of the preset sampling point of the power battery to be tested and the temperature value of each electronic component sampling point;

[0006] Constructing a temperature mapping relationship between the temperature value of the preset position sampling point and each electronic component sampling point that meets preset conditions, and obtaining a first judgment temperature value of each electronic component sampling point;

[0007] Constructing a gradient temperature field of the power battery to be tested according to the temperature value of the preset position sampling point of the power battery to be tested and the temperature value of each electronic component sampling point, and acquiring a second judgment temperature value of each electronic component sampling point according to the gradient temperature field;

[0008] The temperature abnormality of each electronic component is determined according to the first determination temperature value and the second determination temperature value of each electronic component sampling point.

[0009] In some embodiments, the electronic components include a single battery, a power distribution unit, and a battery management unit.

[0010] In some embodiments, the step of "constructing a temperature mapping relationship between the temperature value of the preset position sampling point and each electronic component sampling point that satisfies the preset conditions, and obtaining the first judgment temperature value of each electronic component sampling point" specifically includes the following steps:

[0011] Select temperature values ​​of a preset number of sampling points at preset positions adjacent to each electronic component sampling point;

[0012] According to the following temperature mapping calculation formula, the first judgment temperature value T of each electronic component sampling point is obtained. x ;

[0013] T x =k1T1+k2T2+…+k n T n ;

[0014] Where, T1, T2…T n are respectively the temperature values ​​of the preset number n of sampling points at preset positions; k1, k2…k n They are T1, T2…T n The distance factor affects the

[0015] In some embodiments, the step of "obtaining a second determination temperature value of each electronic component sampling point according to the gradient temperature field" specifically includes the following steps:

[0016] Obtaining two isotherms adjacent to both sides of each electronic component sampling point in the gradient temperature field;

[0017] According to the following calculation formula, the second judgment temperature value T of each electronic component sampling point is obtained: y ;

[0018] T y =(T a -T b )*s+T b ;

[0019] Where, T a , T b are the temperature values ​​of the two isotherms, T a >T b ; s is the factor affecting the distance between two isotherms.

[0020] In some embodiments, the step of "determining the temperature abnormality of each electronic component according to the first determination temperature value and the second determination temperature value of each electronic component sampling point" specifically includes the following steps:

[0021] When it is detected that the difference between the first judgment temperature value and the second judgment temperature value of one of the electronic component sampling points is greater than or equal to a preset threshold, it is determined that the temperature of one of the electronic components is abnormal;

[0022] When it is detected that the difference between the first judgment temperature value and the second judgment temperature value of one of the electronic component sampling points is less than a preset threshold, it is determined that the temperature of one of the electronic components is normal.

[0023] In a second aspect, the present invention provides a power battery system temperature anomaly monitoring system, comprising:

[0024] A temperature data acquisition module is used to obtain the temperature value of a preset sampling point of the power battery to be tested and the temperature value of each electronic component sampling point;

[0025] A first judgment temperature value acquisition module, which is in communication with the temperature data acquisition module, is used to construct a temperature mapping relationship between the temperature value of the preset position sampling point and each electronic component sampling point that meets preset conditions, and acquire a first judgment temperature value of each electronic component sampling point;

[0026] a second judgment temperature value acquisition module, which is in communication with the temperature data acquisition module, and is used to construct a gradient temperature field of the power battery to be tested according to the temperature value of the preset position sampling point of the power battery to be tested and the temperature value of each electronic component sampling point, and to obtain a second judgment temperature value of each electronic component sampling point according to the gradient temperature field;

[0027] The abnormality judgment module is communicatively connected with the first judgment temperature value acquisition module and the second judgment temperature value acquisition module, and is used to judge the temperature abnormality of each electronic component according to the first judgment temperature value and the second judgment temperature value of each electronic component sampling point.

[0028] In some embodiments, the first temperature value determination and acquisition module is used to select temperature values ​​of a preset number of preset position sampling points adjacent to each electronic component sampling point;

[0029] According to the following temperature mapping calculation formula, the first judgment temperature value T of each electronic component sampling point is obtained. x ;

[0030] T x =k1T1+k2T2+…+k n T n ;

[0031] Where, T1, T2…T n are respectively the temperature values ​​of the preset number n of sampling points at preset positions; k1, k2…k n They are T1, T2…Tn The distance factor affects the

[0032] In some embodiments, the second temperature value determination acquisition module is used to acquire two isotherms adjacent to both sides of each electronic component sampling point in the gradient temperature field;

[0033] According to the following calculation formula, the second judgment temperature value T of each electronic component sampling point is obtained: y ;

[0034] T y =(T a -T b )*s+T b ;

[0035] Where, T a 、T b are the temperature values ​​of the two isotherms, T a >T b ; s is the factor affecting the distance between two isotherms.

[0036] In some embodiments, the abnormality judgment module is used to judge that the temperature of one of the electronic components is abnormal when it is detected that the difference between the first judgment temperature value and the second judgment temperature value of one of the electronic component sampling points is greater than or equal to a preset threshold; and judge that the temperature of one of the electronic components is normal when it is detected that the difference between the first judgment temperature value and the second judgment temperature value of one of the electronic component sampling points is less than the preset threshold.

[0037] In a third aspect, the present invention provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the method for monitoring abnormal temperature of a power battery system as described above.

[0038] The beneficial effects brought about by the technical solution provided by the present invention include:

[0039] The present invention first obtains the temperature value of the preset position sampling point of the power battery to be tested and the temperature value of each electronic component sampling point; then constructs a temperature mapping relationship between the preset position sampling point temperature value and each electronic component sampling point that meets the preset conditions, and obtains the first judgment temperature value of each electronic component sampling point; then, according to the preset position sampling point temperature value of the power battery to be tested and the temperature value of each electronic component sampling point, constructs the gradient temperature field of the power battery to be tested, and obtains the second judgment temperature value of each electronic component sampling point according to the gradient temperature field; finally, according to the first judgment temperature value and the second judgment temperature value of each electronic component sampling point, the temperature abnormality of each electronic component is judged. Therefore, the present invention can realize real-time monitoring of all cell temperatures, BMS, distribution units and other electronic components in the battery system, that is, it can realize full coverage of the temperature monitoring of the power battery system, quickly identify and protect the temperature abnormalities of various parts of the power battery system, and can quickly and timely find abnormal temperature points, and lock the corresponding electronic component positions, take over-temperature protection measures at the first time, and prevent the occurrence of safety accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use 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 ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0041] Figure 1 It is a flow chart of an embodiment of a method for monitoring abnormal temperature of a power battery system of the present invention;

[0042] Figure 2 is a schematic diagram of the preset position sampling points of the power battery to be tested of the present invention;

[0043] Figure 3 It is a schematic diagram of the preset position sampling points and each electronic component sampling point of the present invention;

[0044] Figure 4 is a schematic diagram of the gradient temperature field of the power battery to be tested of the present invention;

[0045] Figure 5 It is a structural schematic diagram of a power battery system temperature anomaly monitoring system of the present invention. DETAILED DESCRIPTION

[0046] Reference will now be made in detail to specific embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Although the present invention will be described in conjunction with specific embodiments, it will be understood that it is not intended to limit the present invention to the embodiments described. On the contrary, it is intended to cover changes, modifications and equivalents included in the spirit and scope of the present invention as defined by the appended claims. It should be noted that the method steps described herein can all be implemented by any functional block or functional arrangement, and any functional block or functional arrangement can be implemented as a physical entity or a logical entity, or a combination of the two.

[0047] In order to enable those skilled in the art to better understand the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0048] Note: The example to be introduced below is only a specific example, and is not intended to limit the embodiments of the present invention to the following specific steps, values, conditions, data, sequences, etc. Those skilled in the art can apply the concept of the present invention to construct more embodiments not mentioned in this specification by reading this specification.

[0049] Specifically, Figure 1 As shown, the present invention provides a method for monitoring abnormal temperature of a power battery system, comprising the following steps:

[0050] S100, obtaining a temperature value of a preset sampling point of the power battery to be tested and a temperature value of a sampling point of each electronic component;

[0051] S200, constructing a temperature mapping relationship between the temperature value of the preset position sampling point and each electronic component sampling point that meets preset conditions, and obtaining a first judgment temperature value of each electronic component sampling point;

[0052] S300, constructing a gradient temperature field of the power battery to be tested according to the temperature value of the preset position sampling point of the power battery to be tested and the temperature value of each electronic component sampling point, and acquiring a second judgment temperature value of each electronic component sampling point according to the gradient temperature field;

[0053] S400: judging the abnormal temperature of each electronic component according to the first judgment temperature value and the second judgment temperature value of each electronic component sampling point.

[0054] Preferably, in another embodiment of the present application, the electronic components include single cells, a power distribution unit and a battery management unit.

[0055] Specifically, in this embodiment, see Figure 2 As shown, T XXThe existing temperature sampling points in the prior art correspond to the preset position sampling points in the present invention. There are 32 existing preset position sampling points in total, and each temperature sampling point monitors the temperature of 3 to 4 surrounding battery cells; see Figure 3 As shown, the triangle is a newly added temperature sampling point - corresponding to each electronic component sampling point in the present invention, 106 new temperature sampling points are added, of which one temperature sampling point is added for each single cell (96), 8 temperature sampling points are added for the distribution unit, and 2 temperature sampling points are added for the BMS battery management unit.

[0056] In order to accurately identify abnormal temperature changes at any position of a power battery system during application, the present invention first obtains the temperature value of a preset position sampling point of the power battery to be tested and the temperature value of each electronic component sampling point; then constructs a temperature mapping relationship between the temperature value of the preset position sampling point and each electronic component sampling point that meets preset conditions, and obtains a first judgment temperature value of each electronic component sampling point; then, based on the temperature value of the preset position sampling point of the power battery to be tested and the temperature value of each electronic component sampling point, a gradient temperature field of the power battery to be tested is constructed, and a second judgment temperature value of each electronic component sampling point is obtained based on the gradient temperature field; finally, based on the first judgment temperature value and the second judgment temperature value of each electronic component sampling point, the temperature abnormality of each electronic component is judged.

[0057] Therefore, the present invention can realize real-time monitoring of all battery cell temperatures, BMS, distribution units and other electronic components in the battery system, that is, it can achieve full coverage of the temperature monitoring of the power battery system, quickly identify and protect the temperature anomalies in various parts of the power battery system, and can quickly detect abnormal temperature points in time and lock the corresponding electronic component positions, take over-temperature protection measures as soon as possible, and prevent the occurrence of safety accidents.

[0058] At the same time, the present invention can simulate the gradient temperature field under different working conditions through tests under different working conditions, including the charging process under different ambient temperatures (-20°C, 0°C, 25°C and 40°C) and the temperature changes during the discharge process under different driving modes (economic mode, sports mode and track mode), so as to realize all-round real-time monitoring of the temperature of the battery system under different working conditions, timely detect abnormal temperature changes, take over-temperature protection measures, and prevent the occurrence of safety accidents.

[0059] Preferably, in another embodiment of the present application, the step of "S200, constructing a temperature mapping relationship between the temperature value of the preset position sampling point and each electronic component sampling point that satisfies a preset condition, and obtaining a first judgment temperature value of each electronic component sampling point" specifically includes the following steps:

[0060] Select temperature values ​​of a preset number of sampling points at preset positions adjacent to each electronic component sampling point;

[0061] According to the following temperature mapping calculation formula, the first judgment temperature value Tx of each electronic component sampling point is obtained;

[0062] Tx=k1T1+k2T2+…+knTn;

[0063] Wherein, T1, T2…Tn are the temperature values ​​of the sampling points at preset positions with a preset number n respectively; k1, k2…kn are the distance influencing factors of T1, T2…Tn respectively.

[0064] Specifically, in this embodiment, see Figure 3 As shown, taking the sampling point temperature Tx in the figure as an example, the mapping relationship between Tx and the three adjacent existing temperature sampling points T17, T14 and T7 is established as Tx=k1T17+k2T14+k3T7; through the above method, the mapping relationship between all other electronic component sampling points in the power battery system and the existing temperature sampling points (preset position sampling points) can be obtained, thereby obtaining the first judgment temperature value of each electronic component sampling point.

[0065] Preferably, in another embodiment of the present application, the step of “S300, obtaining a second determination temperature value of each electronic component sampling point according to the gradient temperature field” specifically includes the following steps:

[0066] Obtaining two isotherms adjacent to both sides of each electronic component sampling point in the gradient temperature field;

[0067] According to the following calculation formula, the second temperature value T of each electronic component sampling point is obtained: y ;

[0068] T y =(T a -T b )*s+T b ;

[0069] Where, T a , T b are the temperature values ​​of the two isotherms, T a >T b ; s is the factor affecting the distance between two isotherms.

[0070] Specifically, in this embodiment, a gradient temperature field of the power battery to be tested is constructed according to the temperature value of the sampling point at the preset position of the power battery to be tested and the temperature value of each sampling point of the electronic component. This gradient temperature field can be directly obtained by inputting the temperature value of the sampling point at the preset position of the power battery to be tested and the temperature value of each sampling point of the electronic component in the simulation software.

[0071] The temperature gradient field of the power battery system is simulated through 32 existing temperature sampling points and 106 newly added temperature sampling points. Figure 4 As shown in the figure, the center temperature of the power battery system is higher, and the white arrow indicates the direction of temperature increase, T a , T b Represent the temperature values ​​of the corresponding isotherms, T y represent Figure 2 The temperature value corresponding to Tx in the gradient temperature field is calculated according to the formula T y =(T a -T b )*s+T b , obtain the second judgment temperature value T of each electronic component sampling point y Through the above method, the second judgment temperature value corresponding to any sampling point in the temperature gradient field can be determined.

[0072] Preferably, in another embodiment of the present application, the step of "S400, judging the abnormal temperature condition of each electronic component according to the first judgment temperature value and the second judgment temperature value of each electronic component sampling point" specifically includes the following steps:

[0073] When it is detected that the difference between the first judgment temperature value and the second judgment temperature value of one of the electronic component sampling points is greater than or equal to a preset threshold, it is judged that the temperature of one of the electronic components is abnormal, and the power battery management system activates over-temperature protection to prevent safety accidents.

[0074] When it is detected that the difference between the first judgment temperature value and the second judgment temperature value of one of the electronic component sampling points is less than a preset threshold, it is determined that the temperature of one of the electronic components is normal.

[0075] See also Figure 5 As shown, the embodiment of the present invention further provides a power battery system temperature anomaly monitoring system 100, comprising:

[0076] The temperature data acquisition module 110 is used to acquire the temperature value of the preset position sampling point of the power battery to be tested and the temperature value of each electronic component sampling point;

[0077] A first judgment temperature value acquisition module 120 is connected in communication with the temperature data acquisition module 110, and is used to construct a temperature mapping relationship between the temperature value of the preset position sampling point and each electronic component sampling point that meets the preset conditions, and obtain a first judgment temperature value of each electronic component sampling point;

[0078] A second judgment temperature value acquisition module 130 is communicatively connected to the temperature data acquisition module 110, and is used to construct a gradient temperature field of the power battery to be tested according to the temperature value of the preset position sampling point of the power battery to be tested and the temperature value of each electronic component sampling point, and obtain a second judgment temperature value of each electronic component sampling point according to the gradient temperature field;

[0079] The abnormality judgment module 140 is in communication with the first judgment temperature value acquisition module 120 and the second judgment temperature value acquisition module 130, and is used to judge the temperature abnormality of each electronic component according to the first judgment temperature value and the second judgment temperature value of each electronic component sampling point.

[0080] The first temperature value determination acquisition module 120 is used to select temperature values ​​of a preset number of preset position sampling points adjacent to each electronic component sampling point;

[0081] According to the following temperature mapping calculation formula, the first judgment temperature value T of each electronic component sampling point is obtained. x ;

[0082] T x =k1T1+k2T2+…+k n T n ;

[0083] Where, T1, T2…T n are respectively the temperature values ​​of the preset number n of sampling points at preset positions; k1, k2…k n They are T1, T2…T n The distance factor affects the

[0084] The second judgment temperature value acquisition module 130 is used to acquire two isotherms adjacent to both sides of each electronic component sampling point in the gradient temperature field;

[0085] According to the following calculation formula, the second judgment temperature value T of each electronic component sampling point is obtained: y ;

[0086] T y =(T a -T b )*s+T b ;

[0087] Where, T a , T b are the temperature values ​​of the two isotherms, T a >T b ; s is the factor affecting the distance between two isotherms.

[0088] The abnormality judgment module 140 is used to judge that the temperature of one of the electronic components is abnormal when it is detected that the difference between the first judgment temperature value and the second judgment temperature value of one of the electronic component sampling points is greater than or equal to a preset threshold; and judge that the temperature of one of the electronic components is normal when it is detected that the difference between the first judgment temperature value and the second judgment temperature value of one of the electronic component sampling points is less than the preset threshold.

[0089] In order to accurately identify abnormal temperature changes at any position of a power battery system during application, the present invention first obtains the temperature value of a preset position sampling point of the power battery to be tested and the temperature value of each electronic component sampling point; then constructs a temperature mapping relationship between the temperature value of the preset position sampling point and each electronic component sampling point that meets preset conditions, and obtains a first judgment temperature value of each electronic component sampling point; then, based on the temperature value of the preset position sampling point of the power battery to be tested and the temperature value of each electronic component sampling point, a gradient temperature field of the power battery to be tested is constructed, and a second judgment temperature value of each electronic component sampling point is obtained based on the gradient temperature field; finally, based on the first judgment temperature value and the second judgment temperature value of each electronic component sampling point, the temperature abnormality of each electronic component is judged.

[0090] Therefore, the present invention can realize real-time monitoring of all battery cell temperatures, BMS, distribution units and other electronic components in the battery system, that is, it can achieve full coverage of the temperature monitoring of the power battery system, quickly identify and protect the temperature anomalies in various parts of the power battery system, and can quickly detect abnormal temperature points in time and lock the corresponding electronic component positions, take over-temperature protection measures as soon as possible, and prevent the occurrence of safety accidents.

[0091] Specifically, this embodiment corresponds one-to-one to the above method embodiment, and the functions of each module have been described in detail in the corresponding method embodiment, so they will not be repeated here.

[0092] Based on the same inventive concept, an embodiment of the present application further provides a computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, all or part of the method steps of the above method are implemented.

[0093] The present invention implements all or part of the process in the above method, and can also be completed by instructing related hardware through a computer program. The computer program can be stored in a computer-readable storage medium. When the computer program is executed by a processor, the steps of each method embodiment can be implemented. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may include: any entity or device capable of carrying computer program code, recording medium, USB flash drive, mobile hard disk, disk, optical disk, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electric carrier signal, telecommunication signal and software distribution medium. It should be noted that the content contained in the computer-readable medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, the computer-readable medium does not include electric carrier signals and telecommunication signals.

[0094] Based on the same inventive concept, an embodiment of the present application also provides an electronic device, including a memory and a processor, wherein the memory stores a computer program running on the processor, and when the processor executes the computer program, all or part of the method steps in the above method are implemented.

[0095] The processor may be a central processing unit (CPU), other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor, etc. The processor is the control center of a computer device, and uses various interfaces and lines to connect various parts of the entire computer device.

[0096] The memory can be used to store computer programs and / or models. The processor realizes various functions of the computer device by running or executing the computer programs and / or models stored in the memory, and calling the data stored in the memory. The memory can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system and at least one application required for a function (such as a sound playback function, an image playback function, etc.); the data storage area can store data created according to the use of the mobile phone (such as audio data, video data, etc.). In addition, the memory can include a high-speed random access memory, and can also include a non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a smart memory card (SmartMedia Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), at least one disk storage device, a flash memory device, or other volatile solid-state storage devices.

[0097] It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as methods, systems, servers or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage and optical storage, etc.) containing computer-usable program codes.

[0098] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), servers, and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as a combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0099] These computer program instructions may also be stored in a computer readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture including an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0100] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process in the computer or other programmable device. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0101] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A method for monitoring abnormal temperature of a power battery system, characterized in that: The steps include: Obtain the temperature value of the preset sampling point of the power battery to be tested and the temperature value of each electronic component sampling point; Constructing a temperature mapping relationship between the temperature value of the preset position sampling point and each electronic component sampling point that meets preset conditions, and obtaining a first judgment temperature value of each electronic component sampling point; Constructing a gradient temperature field of the power battery to be tested according to the temperature value of the preset position sampling point of the power battery to be tested and the temperature value of each electronic component sampling point, and acquiring a second judgment temperature value of each electronic component sampling point according to the gradient temperature field; The temperature abnormality of each electronic component is determined according to the first determination temperature value and the second determination temperature value of each electronic component sampling point.

2. The method for monitoring abnormal temperature of a power battery system according to claim 1, characterized in that: The electronic components include a single battery, a power distribution unit and a battery management unit.

3. The method for monitoring abnormal temperature of a power battery system according to claim 1, characterized in that: The step of "constructing a temperature mapping relationship between the temperature value of the preset position sampling point and each electronic component sampling point that satisfies the preset conditions, and obtaining a first judgment temperature value of each electronic component sampling point" specifically includes the following steps: Select temperature values ​​of a preset number of sampling points at preset positions adjacent to each electronic component sampling point; According to the following temperature mapping calculation formula, the first judgment temperature value T of each electronic component sampling point is obtained. x ; T x =k1T1+k2T2+…+k n T n ; Where, T1, T2…T n are respectively the temperature values ​​of the preset number n of sampling points at preset positions; k1, k2…k n They are T1, T2…T n The distance factor affects the 4. The method for monitoring abnormal temperature of a power battery system according to claim 1, characterized in that: The step of "obtaining a second determination temperature value of each electronic component sampling point according to the gradient temperature field" specifically includes the following steps: Obtaining two isotherms adjacent to both sides of each electronic component sampling point in the gradient temperature field; According to the following calculation formula, the second judgment temperature value T of each electronic component sampling point is obtained: y ; T y =(T a -T b )*s+T b ; Where, T a , T b are the temperature values ​​of the two isotherms, T a >T b ; s is the factor affecting the distance between two isotherms.

5. The method for monitoring abnormal temperature of a power battery system according to claim 1, characterized in that: The step of "judging the temperature abnormality of each electronic component according to the first judgment temperature value and the second judgment temperature value of each electronic component sampling point" specifically includes the following steps: When it is detected that the difference between the first judgment temperature value and the second judgment temperature value of one of the electronic component sampling points is greater than or equal to a preset threshold, it is determined that the temperature of one of the electronic components is abnormal; When it is detected that the difference between the first judgment temperature value and the second judgment temperature value of one of the electronic component sampling points is less than a preset threshold, it is determined that the temperature of one of the electronic components is normal.

6. A power battery system temperature abnormality monitoring system, characterized in that: include: A temperature data acquisition module is used to obtain the temperature value of a preset sampling point of the power battery to be tested and the temperature value of each electronic component sampling point; A first judgment temperature value acquisition module, which is in communication with the temperature data acquisition module, is used to construct a temperature mapping relationship between the temperature value of the preset position sampling point and each electronic component sampling point that meets preset conditions, and acquire a first judgment temperature value of each electronic component sampling point; a second judgment temperature value acquisition module, which is in communication with the temperature data acquisition module, and is used to construct a gradient temperature field of the power battery to be tested according to the temperature value of the preset position sampling point of the power battery to be tested and the temperature value of each electronic component sampling point, and to obtain a second judgment temperature value of each electronic component sampling point according to the gradient temperature field; The abnormality judgment module is communicatively connected with the first judgment temperature value acquisition module and the second judgment temperature value acquisition module, and is used to judge the temperature abnormality of each electronic component according to the first judgment temperature value and the second judgment temperature value of each electronic component sampling point.

7. The power battery system temperature abnormality monitoring system according to claim 6, characterized in that: The first temperature value determination and acquisition module is used to select temperature values ​​of a preset number of preset position sampling points adjacent to each electronic component sampling point; According to the following temperature mapping calculation formula, the first judgment temperature value T of each electronic component sampling point is obtained. x ; T x =k1T1+k2T2+…+k n T n ; Where, T1, T2…T n are respectively the temperature values ​​of the preset number n of sampling points at preset positions; k1, k2…k n They are T1, T2…T n The distance factor affects the 8. The power battery system temperature abnormality monitoring system according to claim 6, characterized in that: The second judgment temperature value acquisition module is used to obtain two isotherms adjacent to both sides of each electronic component sampling point in the gradient temperature field; According to the following calculation formula, the second judgment temperature value T of each electronic component sampling point is obtained: y ; T y =(T a -T b )*s+T b ; Where, T a , T b are the temperature values ​​of the two isotherms, T a >T b ; s is the factor affecting the distance between two isotherms.

9. The power battery system temperature abnormality monitoring system according to claim 6, characterized in that: The abnormality judgment module is used to judge that the temperature of one of the electronic components is abnormal when it is detected that the difference between the first judgment temperature value and the second judgment temperature value of one of the electronic component sampling points is greater than or equal to a preset threshold; When it is detected that the difference between the first judgment temperature value and the second judgment temperature value of one of the electronic component sampling points is less than a preset threshold, it is determined that the temperature of one of the electronic components is normal.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method for monitoring abnormal temperature of a power battery system according to any one of claims 1 to 5 is implemented.

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