Power battery safety detection device and detection method, terminal equipment and medium

Abstract

The invention discloses a power battery safety detection device and detection method, terminal equipment and a medium, and relates to the technical field of battery detection. The device comprises a base, a closed spherical tank body, a test platform and a control module, the closed spherical tank body comprises an upper half spherical tank body and a lower half spherical tank body, the test platform is located in the lower half spherical tank body, and a battery fixing table in the test platform is arranged at the sphere center of the lower half spherical tank body; the sensor positioning frame is arranged on the periphery of the battery fixing table in a surrounding mode, sensors are arranged in different directions of the sensor positioning frame, the control module can control the working mode of the battery failure triggering module so as to cause thermal runaway of the battery to be detected, and according to monitoring values of the sensors and weights corresponding to the monitoring values, the battery failure triggering module can control the battery failure triggering module. And determining the safety score of the to-be-detected battery. By adopting the device, the distribution condition of each monitoring value in the failure process of the battery can be directly and comprehensively monitored by utilizing the spherical boundary and the sensors at different positions, and the reliability of the obtained safety score is high.

Description

Technical Field

[0001] The present application relates to the field of battery detection technology, and in particular to a power battery safety detection device and detection method, terminal equipment, and medium. Background Art

[0002] In modern society, cars have become an indispensable means of transportation for people, bringing great convenience to daily travel. As the concepts of energy conservation, environmental protection and green development continue to gain popularity, the use of electric vehicles is becoming more and more extensive, and the safety of power batteries cannot be ignored.

[0003] At present, the safety detection device in the relevant technology can only detect the average value of a single parameter in a confined space when the power battery fails, and cannot obtain the distribution of the single parameter in the confined space, which in turn affects the detection accuracy and safety assessment. Summary of the invention

[0004] In view of the above-mentioned defects or deficiencies in the related art, it is desired to provide a power battery safety detection device and detection method, terminal equipment, and medium that can accurately monitor battery failure behavior and improve the reliability of safety evaluation.

[0005] In a first aspect, the present application provides a power battery safety detection device, the power battery safety detection device comprising a base, a closed spherical tank, a test platform, a gantry and a control module; the closed spherical tank comprises an upper spherical tank and a lower spherical tank, the upper spherical tank is slidably connected to the gantry and can reciprocate in a vertical direction along a first slide rail of the gantry, the lower spherical tank is located inside the base, and a second slide rail is provided on the periphery of the base for the gantry to reciprocate in a horizontal direction; The test platform is located inside the lower half of the spherical tank, and includes a battery fixing platform, a battery failure trigger module, a sensor positioning frame and cables, wherein the cables include a first cable and a second cable, the battery fixing platform is arranged at the center of the lower half of the spherical tank, the sensor positioning frame is arranged around the periphery of the battery fixing platform, and sensors are arranged in different directions of the sensor positioning frame; The control module is connected to the battery failure trigger module through the first cable and to the sensor through the second cable. The control module is configured to control the working mode of the battery failure trigger module to cause thermal runaway of the battery to be tested when the battery to be tested is placed on the battery fixing table and the upper half spherical tank body and the lower half spherical tank body are sealed and connected; if the monitoring value of the sensor meets the first preset condition, stop running the battery failure trigger module, and continue to collect the monitoring value of the sensor until the monitoring value of the sensor meets the second preset condition; extract the monitoring value of the sensor between the corresponding time of starting detection and the corresponding time of the second preset condition, and determine the safety score of the battery to be tested according to the monitoring value of the sensor and the weight corresponding to the monitoring value.

[0006] Optionally, in some embodiments of the present application, the support center of the sensor positioning frame is located below the battery fixing platform, and the sensor positioning frame includes a plurality of positioning brackets, and the plurality of positioning brackets are distributed in the radial direction of a circle formed with the support center as the center.

[0007] Optionally, in some embodiments of the present application, the multiple positioning brackets include a first positioning bracket, a second positioning bracket, a third positioning bracket and a fourth positioning bracket, the first positioning bracket and the second positioning bracket are located in a first partition of the circle, and the third positioning bracket and the fourth positioning bracket are located in a second partition of the circle.

[0008] Optionally, in some embodiments of the present application, the sensor type of the first positioning bracket is the same as the sensor type of the third positioning bracket, the sensor type of the second positioning bracket is the same as the sensor type of the fourth positioning bracket, and the sensor type of the first positioning bracket is different from the sensor type of the second positioning bracket.

[0009] Optionally, the sensors in some embodiments of the present application include a voltage sensor for monitoring voltage changes during thermal runaway of the battery to be tested, a temperature sensor for monitoring temperature changes during thermal runaway of the battery to be tested, an expansion force sensor for monitoring expansion force changes during thermal runaway of the battery to be tested, a smoke sensor for monitoring smoke production during thermal runaway of the battery to be tested, and an air pressure sensor for monitoring gas production during thermal runaway of the battery to be tested.

[0010] Optionally, the sensor in some embodiments of the present application further includes a mass sensor for monitoring the pressure relief valve eruption pressure and data verification during the thermal runaway process of the battery to be tested.

[0011] Optionally, in some embodiments of the present application, the battery failure trigger module includes an electric heating mechanism, an electric signal stimulation mechanism, a squeezing mechanism arranged on the side of the battery fixing platform, and a puncture mechanism under the battery fixing platform.

[0012] In a second aspect, the present application provides a power battery safety detection method, the power battery safety detection method is used in the power battery safety detection device according to any one of the first aspects, and the power battery safety detection method includes: When the battery to be tested is placed on the battery fixing platform and the upper half spherical tank body and the lower half spherical tank body are sealed and connected, the working mode of the battery failure trigger module is controlled to cause thermal runaway of the battery to be tested; If the monitoring value of the sensor meets the first preset condition, the battery failure trigger module is stopped, and the monitoring value of the sensor is continuously collected until the monitoring value of the sensor meets the second preset condition; The monitoring value of the sensor between the time corresponding to the start of detection and the time corresponding to the second preset condition is extracted, and the safety score of the battery to be tested is determined according to the monitoring value of the sensor and the weight corresponding to the monitoring value.

[0013] In a third aspect, the present application provides a terminal device, comprising a processor and a memory, wherein the memory stores at least one instruction, at least one program, a code set or an instruction set, and the instruction, the program, the code set or the instruction set is loaded and executed by the processor to implement the steps of the power battery safety detection method described in the second aspect.

[0014] In a fourth aspect, the present application provides a computer-readable storage medium, which stores one or more programs, and the one or more programs can be executed by one or more processors to implement the steps of the power battery safety detection method described in the second aspect.

[0015] It can be seen from the above technical solutions that the embodiments of the present application have the following advantages: The embodiments of the present application provide a power battery safety detection device and detection method, terminal equipment, and medium. A battery fixing platform is set in the lower half of the spherical tank body of the closed spherical tank body, and the battery fixing platform is located at the center of the sphere of the lower half of the spherical tank body. The sensor positioning frame is arranged around the periphery of the battery fixing platform, and sensors are arranged in different directions of the sensor positioning frame. Therefore, the spherical boundary and sensors in different positions can be used to directly monitor the distribution of various monitoring values ​​during the battery failure process in an all-round manner without using an average value. At the same time, the upper half of the spherical tank body and the lower half of the spherical tank body can form a closed space, which helps to eliminate interference from the external environment. The obtained monitoring values ​​are more accurate, and then the safety score of the battery to be tested is determined based on the monitoring values ​​of the sensors and the weights corresponding to the monitoring values, and the reliability is strong. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 A schematic diagram of the overall structure of a power battery safety detection device provided in an embodiment of the present application; Figure 2 A method provided in the embodiment of the present application Figure 1 A schematic cross-sectional view of the device shown; Figure 3 A schematic diagram of the structure of a sensor positioning frame provided in an embodiment of the present application; Figure 4 A method provided in the embodiment of the present application Figure 1 A schematic diagram of the top view of the structure of the device shown; Figure 5 A schematic diagram of a power battery safety detection method provided in an embodiment of the present application; Figure 6 A schematic diagram of a voltage monitoring value curve of a voltage sensor provided in an embodiment of the present application; Figure 7 A schematic diagram of a temperature monitoring value curve of a first subarea temperature sensor provided in an embodiment of the present application; Figure 8 A schematic diagram of a smoke production monitoring value curve of a first zone smoke sensor provided in an embodiment of the present application; Fig. 9 A schematic diagram of an expansion force monitoring value curve of a first partition expansion force sensor provided in an embodiment of the present application; Fig.10A structural block diagram of a terminal device provided in an embodiment of the present application.

[0018] Reference numerals: 10-power battery safety detection device, 101-base, 102-sealed spherical tank, 1021-upper half of the spherical tank, 1022-lower half of the spherical tank, 103-test platform, a-support center of the sensor positioning frame, b-positioning bracket, b1-first positioning bracket, b2-second positioning bracket, b3-third positioning bracket, b4-fourth positioning bracket, 104-gantry, 20-terminal device, 21-processor, 22-memory. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0020] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0021] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. Figures 1 to 10 The power battery safety detection device and detection method, terminal equipment, and medium provided in the embodiments of the present application are explained in detail.

[0022] Please refer to Figure 1 , which is a schematic diagram of the overall structure of a power battery safety detection device provided in an embodiment of the present application. The power battery safety detection device 10 includes a base 101, a closed spherical tank 102, a test platform 103, a gantry 104 and a control module (not shown in the figure). Figure 2As shown, the closed spherical tank body 102 includes an upper spherical tank body 1021 and a lower spherical tank body 1022. The upper spherical tank body 1021 is slidably connected to the gantry 104 and can reciprocate in the vertical direction along the first slide rail of the gantry 104, while the lower spherical tank body 1022 is located inside the base 101. The periphery of the base 101 is provided with a second slide rail for the gantry 104 to reciprocate in the horizontal direction. That is, the opening and closing of the upper spherical tank body 1021 is achieved by the vertical movement of the upper spherical tank body 1021 and the horizontal movement of the gantry 104 itself. The movement process is controlled by a motor. The advantage of such a setting is that compared with the traditional pop-up design, the total floor space of the equipment can be reduced, which is convenient for the staff to operate the test platform 103 inside the lower spherical tank body 1022.

[0023] In some embodiments of the present application, a plurality of locking wheels may be provided at the bottom of the base 101 to facilitate the transportation of the equipment. At the same time, control buttons may be provided on the periphery of the base 101, which can complete partial operations such as the movement of the gantry 104, the opening and closing of the upper spherical tank body 1021, and the manual selection of the working mode of the battery failure trigger module without the operation of control modules such as computer equipment. In addition, a maintenance cabin may be provided under the base 101 to place communication modules and cables, etc., and a gas pipeline connected to the closed spherical tank body 102 may be provided. Placing the air pressure sensor here can avoid the adverse effects of instantaneous combustion and explosion processes in the cabin on the air pressure sensor. The total volume of the sealed spherical tank 102 is 1150L. Compared with the traditional columnar container or square container, the influence of the boundary shape on the distribution of the internal parameters of the container can be significantly reduced. Combined with the larger tank design (the maximum cross-sectional diameter of the sphere is 1300 mm, which is much larger than the size of the battery to be tested) and the multi-point sensor arrangement in the tank, the temperature, smoke and gas distribution inside the container can be accurately analyzed. Compared with the traditional method of only obtaining the average value of a single parameter in the tank, it can better achieve the reproduction of battery failure in actual scenarios and higher spatial accuracy analysis, which is conducive to battery companies to improve products and prevent failure disasters. Among them, the upper half of the spherical tank 1021 can be provided with a gas exchange channel, and the hole position is sealed. When the channel is closed, the airtightness of the tank can be ensured. A plurality of column pin bolts are set at the closed section with the lower half of the spherical tank 1022 for limiting, and together with the sealing rubber ring placed at the section, the airtightness of the inside of the sphere after closing is ensured, and when the channel is opened, vacuuming, ventilation and gas collection inside the tank can be realized.

[0024] In some embodiments of the present application, the test platform 103 may include but is not limited to a battery fixing station, a battery failure trigger module, a sensor positioning frame and cables, etc. The cables include a first cable and a second cable. The battery fixing station is arranged at the center of the lower half of the spherical tank 1022, and the sensor positioning frame is arranged around the periphery of the battery fixing station, and sensors are arranged in different directions of the sensor positioning frame. Figure 3 As shown, the support center a of the sensor positioning frame is located below the battery fixing platform, and the sensor positioning frame includes multiple positioning brackets b, which are distributed in the radius direction of the circle formed by the support center a as the center, thereby realizing the positioning of each sensor in three-dimensional space and accurately collecting temperature, smoke and gas signals at multiple points in the tank. Figure 4 As shown, the plurality of positioning brackets b may include a first positioning bracket b1, a second positioning bracket b2, a third positioning bracket b3 and a fourth positioning bracket b4, the first positioning bracket b1 and the second positioning bracket b2 are located in the first partition of the circle, the third positioning bracket b3 and the fourth positioning bracket b4 are located in the second partition of the circle, and the sensor type of the first positioning bracket b1 is the same as the sensor type of the third positioning bracket b3, the sensor type of the second positioning bracket b2 is the same as the sensor type of the fourth positioning bracket b4, and the sensor type of the first positioning bracket b1 is different from the sensor type of the second positioning bracket b2, so that the spherical boundary and sensors at different positions can be used to directly monitor the distribution of each monitoring value in the battery failure process in an all-round manner. Further, the sensor types at different radial positions on the first positioning bracket b1 are the same, the sensor types at different radial positions on the second positioning bracket b2 are the same, the sensor types at different radial positions on the third positioning bracket b3 are the same, and the sensor types at different radial positions on the fourth positioning bracket b4 are the same, so that it is also possible to quickly detect and determine the distribution law of each monitoring value in the thermal runaway process of the battery to be tested.

[0025] For another example, the sensor includes but is not limited to a voltage sensor for monitoring voltage changes during thermal runaway of the battery to be tested, a temperature sensor for monitoring temperature changes during thermal runaway of the battery to be tested, an expansion force sensor for monitoring expansion force changes during thermal runaway of the battery to be tested, a smoke sensor (PM2.5, PM10) for monitoring smoke production during thermal runaway of the battery to be tested, and an air pressure sensor for monitoring gas production during thermal runaway of the battery to be tested. For example, the temperature rise rate is calculated by directly reading the real-time temperature through the temperature sensor, that is, the first-order derivative of the real-time temperature with respect to time is calculated, and the sensor sampling frequency is 10Hz. For another example, the gas production and gas production rate are calculated by the reading of the air pressure sensor. The gas production is calculated based on the ideal gas state equation pV = nRT to obtain V, where p represents the reading of the air pressure sensor, n represents the amount of gas substance (mol), R represents the molar gas constant (in J / (mol•K)), T represents the temperature (in K), and the gas production rate is the first-order derivative of the gas volume with respect to time.

[0026] In addition to the above types, sensors can also include mass sensors and various gas sensors (CO, CO2, H2, CH4) for monitoring the pressure relief valve eruption pressure and data verification during the thermal runaway of the battery to be tested. For example, if the battery to be tested is placed vertically, the pressure relief valve is vertically upward. If the battery to be tested does not have a valve, the pressure on the mass sensor set on the battery fixing table is equal to the gravity of the battery to be tested. If the battery to be tested has a valve, the pressure on the mass sensor is the sum of the gravity of the battery to be tested and the eruption pressure. Therefore, the eruption pressure can be calculated based on the numerical change of the mass sensor at the moment of the pressure relief valve eruption, that is, the eruption pressure = (mass sensor reading at the moment of eruption - initial reading of the mass sensor) * g, where g represents the acceleration of gravity and is taken as 9.8N / kg. At the same time, considering that the final state of the battery to be tested mass - the initial state of the battery to be tested mass = the total amount of emissions during the battery to be tested spray valve, and the total amount of emissions during the battery to be tested spray valve = the total smoke production of the battery to be tested + the total gas production of the battery to be tested, the deviation between the monitoring results of the quality sensor and the total monitoring results of the smoke sensor and the air pressure sensor can be compared. If the deviation exceeds the preset threshold, it indicates that the sensor needs to be calibrated or replaced to achieve data verification and improve the calculation accuracy. For another example, the internal space of the lower half of the spherical tank 1022 is relatively large, and local high temperatures often occur during battery explosions. All temperature sensors can meet the maximum temperature requirements (1200°C) during battery explosions. For other types of sensors, the placement position is at a certain distance from the battery to be tested, and the local high temperature will gradually cool down during the diffusion process. Therefore, the temperature resistance of other types of sensors can meet the test requirements. For the protection of dust generated by the explosion, an isolation layer is set on the sensor housing to avoid the adverse effects of the explosion products on the sensor, and the resulting monitoring value is more accurate.

[0027] For another example, the battery failure trigger module includes but is not limited to an electric heating mechanism, an electric signal stimulation mechanism, an extrusion mechanism arranged on the side of the battery fixing platform, and an acupuncture mechanism under the battery fixing platform, etc. That is to say, the methods of triggering the failure of the battery to be tested include heating, electric signal stimulation, extrusion and acupuncture, etc., and the working modes of the battery failure trigger module include single triggering and combined triggering. Among them, the electric heating mechanism may include an electric heating plate, which can adjust the heating rate by adjusting the heating power and can be dynamically adjusted during the test. If heating is selected as the failure triggering method, it is necessary to attach the electric heating plate to the large surface of the battery to be tested and then arrange the temperature sensor, and install the battery clamp as needed; the electric signal stimulation mechanism needs to connect the channel line reserved inside the tank body to the positive and negative poles of the battery to be tested respectively, and control the electrochemical workstation or charge and discharge tester through control modules such as computer equipment to achieve overcharging, over-discharging and overcurrent triggering of the battery to be tested Failure (voltage and current can be precisely controlled); the shape of the extrusion block in the extrusion mechanism is replaceable, and the moving speed of the extrusion block is controlled by the program; and the acupuncture mechanism can replace different needles (steel needles or insulating needles, the needle tip diameter and cone angle are adjustable) according to the test requirements, and the moving speed and displacement of the needle are controlled by the program to achieve high-precision shallow puncture (the minimum displacement is 0.1mm, and the control accuracy can reach the electrode sheet level).

[0028] In some embodiments of the present application, the control module may be a computer device, which is connected to the battery failure trigger module through a first cable and to the sensor through a second cable. The control module can control the working mode of the battery failure trigger module to cause thermal runaway of the battery to be tested when the battery to be tested is placed on the battery fixing table and the upper half of the spherical tank body 1021 and the lower half of the spherical tank body 1022 are sealed and connected. If the monitoring value of the sensor meets a first preset condition, for example, the first preset condition includes but is not limited to the temperature exceeding a first preset temperature threshold, the temperature rise rate reaching a preset temperature rise rate threshold, and the voltage dropping to a preset voltage threshold, the operation is stopped. A battery failure trigger module is implemented, and the monitoring value of the sensor is continuously collected until the monitoring value of the sensor meets a second preset condition, such as the second preset condition including but not limited to the temperature dropping to a second preset temperature threshold, such as the second preset temperature threshold being room temperature, and then the monitoring value of the sensor between the corresponding moment of starting detection and the corresponding moment of the second preset condition is extracted, and the safety score of the battery to be tested is determined based on the monitoring value of the sensor and the weight corresponding to the monitoring value, such as the corresponding moment of starting detection is the time point corresponding to the placement of the battery to be tested on the battery fixing table and the sealing connection of the upper half of the spherical tank body 1021 and the lower half of the spherical tank body 1022.

[0029] The power battery safety detection device provided in the embodiment of the present application is provided with a battery fixing platform in the lower half of the spherical tank body of the closed spherical tank body, and the battery fixing platform is located at the center of the sphere of the lower half of the spherical tank body, and the sensor positioning frame is arranged around the periphery of the battery fixing platform, and sensors are provided in different directions of the sensor positioning frame, thereby being able to directly monitor the distribution of each monitoring value in the battery failure process in an all-round manner by using the spherical boundary and sensors in different positions, without using an average value, and at the same time, the upper half of the spherical tank body and the lower half of the spherical tank body can form a closed space, which helps to eliminate interference from the external environment, and the obtained monitoring values ​​are more accurate, and then the safety score of the battery to be tested is determined based on the monitoring value of the sensor and the weight corresponding to the monitoring value, and the reliability is strong.

[0030] Based on the above embodiments, the present invention provides a power battery safety detection method, which can be used to Figures 1 to 4 The power battery safety detection device 10 of the corresponding embodiment. Please refer to Figure 5 , which is a flow chart of a power battery safety detection method provided in an embodiment of the present application, the method specifically comprises the following steps: S101, when the battery to be tested is placed on the battery fixing table and the upper half of the spherical tank body and the lower half of the spherical tank body are sealed and connected, the working mode of the battery failure trigger module is controlled to cause thermal runaway of the battery to be tested.

[0031] Exemplarily, before the test, the sealed spherical tank body 102 is opened, the battery to be tested is placed on the battery fixing table, and the electrical signal acquisition line is connected, and the sensor is turned on to verify that the signal acquisition is normal. Then, through the horizontal movement of the gantry 104 and the vertical movement of the upper spherical tank body 1021, the upper spherical tank body 1021 and the lower spherical tank body 1022 are sealed and connected, and a plurality of pin bolts are set at the closed cross section of the upper spherical tank body 1021 and the lower spherical tank body 1022 for limiting, and together with the sealing rubber ring placed at the cross section, the airtightness of the interior of the sphere after closing is ensured. In addition, the working modes of the battery failure trigger module include single triggering and combined triggering, and the way to trigger the failure of the battery to be tested includes at least one of heating, electrical signal stimulation, extrusion and acupuncture.

[0032] S102: If the monitoring value of the sensor meets the first preset condition, stop running the battery failure trigger module, and continue to collect the monitoring value of the sensor until the monitoring value of the sensor meets the second preset condition.

[0033] Exemplarily, when the temperature monitoring value obtained by the temperature sensor exceeds the first preset temperature threshold, it indicates that the battery to be tested has reached a thermal runaway state and the battery failure trigger module needs to be stopped, and when the temperature monitoring value obtained by the temperature sensor drops to the second preset temperature threshold, it indicates that the thermal runaway state of the battery to be tested has ended. After the internal temperature of the sealed spherical tank body 102 drops to room temperature, the smoke in the tank is discharged through the gas exchange channel of the upper half of the spherical tank body 1021, the tank body is opened, the battery to be tested is taken out, and the test is stopped after the tank body is cleaned.

[0034] S103, extracting the monitoring value of the sensor between the time corresponding to the start of detection and the time corresponding to the second preset condition, and determining the safety score of the battery to be tested according to the monitoring value of the sensor and the weight corresponding to the monitoring value.

[0035] For example, considering the defects / damage, small leakage / aluminum-plastic film rupture, serious leakage / aluminum-plastic film rupture, rupture, fire or smoke, and explosion that occur in sequence during the failure of the battery to be tested, the power battery safety detection device 10 of the embodiment of the present application is used to monitor the real-time state of the battery to be tested from multiple dimensions of electricity, heat, gas, and force. For example, each partition sensor includes a voltage sensor, a temperature sensor, a smoke sensor, and an expansion force sensor. The voltage sensor can share one. The voltage monitoring value curve of the voltage sensor is as follows: Figure 6 As shown, the temperature monitoring value curve of the first partition temperature sensor is as follows Figure 7 As shown in the figure, the smoke sensor smoke production monitoring value curve is as follows Figure 8 As shown in the figure, the expansion force monitoring value curve of the expansion force sensor is as follows Fig. 9 As shown. The voltage monitoring value score is (1) In formula (1), Indicates the current voltage monitoring value in volts; Indicates the initial voltage monitoring value in volts. The weight corresponding to the voltage monitoring value may be 20%.

[0036] The score of the temperature monitoring value is (2) In formula (2), Indicates the current temperature in °C. The weight corresponding to the temperature monitoring value can be 40%.

[0037] The score of the smoke production monitoring value is (3) In formula (3), Indicates smoke production in ppm; the weight corresponding to the smoke production monitoring value may be 35%.

[0038] The score of the expansion force monitoring value is (4) In formula (4), Indicates the current expansion force in Newtons; Indicates the initial expansion force, in Newtons; the weight corresponding to the expansion force monitoring value can be 5%. It should be noted that the weight corresponding to the voltage monitoring value, the weight corresponding to the temperature monitoring value, the weight corresponding to the smoke production monitoring value, and the weight corresponding to the expansion force monitoring value can be determined based on a large amount of historical test data of the same type of batteries corresponding to the battery to be tested, that is, each weight can be continuously learned and dynamically adjusted.

[0039] Furthermore, the safety score of the first partition is =0.2* +0.4* + 0.35* +0.05* , the second division scored safely The calculation principle is the same. After obtaining the safety score of each partition, the safety score of the battery to be tested is determined based on the weight corresponding to the partition, for example, the safety score of the battery to be tested is =0.45* +0.55* Of course, the circle formed with the support center a as the center can also be divided into three partitions, four partitions, five partitions, etc. The sensor types between the partitions are the same, and the sensor types within the partitions are different. The weight corresponding to each partition can be determined according to the simulation test of the battery to be tested, thereby combining the simulation test with the actual test, and the result obtained is more accurate.

[0040] It should be noted that, for the description of the same steps and the same contents in this embodiment as those in other embodiments, reference can be made to the description in other embodiments and will not be repeated here.

[0041] The power battery safety detection method provided in the embodiment of the present application is achieved by setting a battery fixing platform in the lower half of the spherical tank body of the closed spherical tank body, and the battery fixing platform is located at the center of the sphere of the lower half of the spherical tank body, and the sensor positioning frame is arranged around the periphery of the battery fixing platform, and sensors are provided in different directions of the sensor positioning frame, thereby being able to use the spherical boundary and sensors in different positions to directly and comprehensively monitor the distribution of each monitoring value during the battery failure process without using an average value. At the same time, the upper half of the spherical tank body and the lower half of the spherical tank body can form a closed space, which helps to eliminate interference from the external environment, and the obtained monitoring values ​​are more accurate, and then the safety score of the battery to be tested is determined based on the monitoring value of the sensor and the weight corresponding to the monitoring value, and the reliability is strong.

[0042] As another aspect, the present application embodiment provides a terminal device. Fig.10 The terminal device 20 may include a processor 21 and a memory 22. The memory 22 stores at least one instruction, at least one program, code set or instruction set, which is loaded and executed by the processor 21 to implement Figures 5 to 9 The steps of the power battery safety detection method of the corresponding embodiment.

[0043] As another aspect, the present application provides a computer-readable storage medium for storing program code, the program code for executing the aforementioned Figures 5 to 9 Any implementation manner of the power battery safety detection method in the corresponding embodiment.

[0044] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and modules described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0045] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the modules is only a logical function division. There may be other division methods in actual implementation, such as multiple modules or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or modules, which can be electrical, mechanical or other forms. The modules described as separate components may or may not be physically separated, and the components displayed as modules may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the scheme of this embodiment.

[0046] In addition, each functional module in each embodiment of the present application may be integrated into a processing unit, or each module may exist physically separately, or two or more units may be integrated into one module. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of a software functional unit. If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it may be stored in a computer-readable storage medium.

[0047] Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions to enable a computer device (which can be a personal computer, server, or network device, etc.) to perform all or part of the steps of the power battery safety detection method of each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), disk or optical disk, etc., various media that can store program codes.

[0048] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0049] This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and core ideas of this application. At the same time, for those skilled in the art, according to the ideas of this application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting this application.

Claims

1. A power battery safety detection device, characterized in that: The power battery safety detection device (10) comprises a base (101), a sealed spherical tank body (102), a test platform (103), a gantry (104), and a control module; the sealed spherical tank body (102) comprises an upper spherical tank body (1021) and a lower spherical tank body (1022); the upper spherical tank body (1021) is slidably connected to the gantry (104) and can reciprocate in a vertical direction along a first slide rail of the gantry (104); the lower spherical tank body (1022) is located inside the base (101); and a second slide rail is provided on the periphery of the base (101) for allowing the gantry (104) to reciprocate in a horizontal direction; The test platform (103) is located inside the lower half spherical tank (1022), the test platform (103) comprises a battery fixing platform, a battery failure trigger module, a sensor positioning frame and cables, the cables comprising a first cable and a second cable, the battery fixing platform is arranged at the center of the lower half spherical tank (1022), the sensor positioning frame is arranged around the periphery of the battery fixing platform, and sensors are arranged in different directions of the sensor positioning frame; The control module is connected to the battery failure trigger module via the first cable and to the sensor via the second cable. The control module is configured to control the working mode of the battery failure trigger module to cause thermal runaway of the battery under test when the battery under test is placed on the battery fixing table and the upper half spherical tank body (1021) and the lower half spherical tank body (1022) are sealed and connected; if the monitoring value of the sensor meets the first preset condition, stop running the battery failure trigger module and continue to collect the monitoring value of the sensor until the monitoring value of the sensor meets the second preset condition; The monitoring value of the sensor between the time corresponding to the start of detection and the time corresponding to the second preset condition is extracted, and the safety score of the battery to be tested is determined according to the monitoring value of the sensor and the weight corresponding to the monitoring value.

2. The power battery safety detection device according to claim 1, characterized in that: The support center (a) of the sensor positioning frame is located below the battery fixing platform. The sensor positioning frame includes a plurality of positioning brackets (b), and the plurality of positioning brackets (b) are distributed in the radial direction of a circle formed with the support center (a) as the center.

3. The power battery safety detection device according to claim 2, characterized in that: The plurality of positioning brackets (b) include a first positioning bracket (b1), a second positioning bracket (b2), a third positioning bracket (b3) and a fourth positioning bracket (b4); the first positioning bracket (b1) and the second positioning bracket (b2) are located in a first partition of the circle, and the third positioning bracket (b3) and the fourth positioning bracket (b4) are located in a second partition of the circle.

4. The power battery safety detection device according to claim 3, characterized in that: The sensor type of the first positioning bracket (b1) is the same as the sensor type of the third positioning bracket (b3), the sensor type of the second positioning bracket (b2) is the same as the sensor type of the fourth positioning bracket (b4), and the sensor type of the first positioning bracket (b1) is different from the sensor type of the second positioning bracket (b2).

5. The power battery safety detection device according to any one of claims 1 to 4, characterized in that: The sensor includes a voltage sensor for monitoring voltage changes during thermal runaway of the battery to be tested, a temperature sensor for monitoring temperature changes during thermal runaway of the battery to be tested, an expansion force sensor for monitoring expansion force changes during thermal runaway of the battery to be tested, a smoke sensor for monitoring smoke production during thermal runaway of the battery to be tested, and a pressure sensor for monitoring gas production during thermal runaway of the battery to be tested.

6. The power battery safety detection device according to claim 5, characterized in that: The sensor also includes a quality sensor for monitoring the pressure relief valve eruption pressure and data verification during the thermal runaway process of the battery to be tested.

7. The power battery safety detection device according to any one of claims 1 to 4, characterized in that: The battery failure trigger module comprises an electric heating mechanism, an electric signal stimulation mechanism, a squeezing mechanism arranged on the side of the battery fixing platform, and a puncture mechanism under the battery fixing platform.

8. A power battery safety detection method, characterized in that: The power battery safety detection method is used for the power battery safety detection device described in any one of 1 to 7, and the power battery safety detection method includes: When the battery to be tested is placed on the battery fixing platform and the upper half spherical tank body and the lower half spherical tank body are sealed and connected, the working mode of the battery failure trigger module is controlled to cause thermal runaway of the battery to be tested; If the monitoring value of the sensor meets the first preset condition, the battery failure trigger module is stopped, and the monitoring value of the sensor is continuously collected until the monitoring value of the sensor meets the second preset condition; The monitoring value of the sensor between the time corresponding to the start of detection and the time corresponding to the second preset condition is extracted, and the safety score of the battery to be tested is determined according to the monitoring value of the sensor and the weight corresponding to the monitoring value.

9. A terminal device, characterized in that: The terminal device includes a processor and a memory, wherein the memory stores at least one instruction, at least one program, code set or instruction set, and the instruction, the program, the code set or the instruction set is loaded and executed by the processor to implement the steps of the power battery safety detection method according to claim 8.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores one or more programs, and the one or more programs can be executed by one or more processors to perform the steps of the power battery safety detection method according to claim 8.

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