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

Abstract

The present application discloses a power battery safety detection device, a detection method, a terminal device, and a medium, relating to the technical field of battery detection. The device includes a base, a sealed spherical tank, a test platform, and a control module. The sealed spherical tank includes an upper half spherical tank and a lower half spherical tank. The test platform is located inside the lower half spherical tank. A battery fixing platform in the test platform is arranged at the center of the sphere of the lower half spherical tank. A sensor positioning frame is arranged around the battery fixing platform, and sensors are provided in different directions of the sensor positioning frame. The control module can control the working mode of the battery failure trigger module to cause thermal runaway of the battery under test, and determine the safety score of the battery under test according to the monitoring values of the sensors and the weights corresponding to the monitoring values. By using the device of the present application, the distribution of each monitoring value during the battery failure process can be directly monitored in all directions by using the spherical boundary and sensors at different positions, and the obtained safety score has strong reliability.

Description

Technical Field

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

[0002] In modern society, automobiles have become an indispensable means of transportation for people, bringing great convenience to daily travel. With the concepts of energy conservation, environmental protection, and green development taking root in people's hearts, the use of electric vehicles is becoming more and more widespread, and the safety of power batteries cannot be ignored.

[0003] Currently, in related technologies, the safety detection device can only detect the average value of a single parameter in a closed space when the power battery fails, and cannot obtain the distribution of this single parameter in the closed space, thus affecting the detection accuracy and safety assessment. Summary of the Invention

[0004] In view of the above defects or deficiencies in related technologies, it is desired to provide a power battery safety detection device, a detection method, a terminal device, and a medium that can accurately monitor the 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, which includes a base, a closed spherical tank, a test platform, a gantry, and a control module; the closed spherical tank includes an upper half spherical tank and a lower half spherical tank, the upper half spherical tank is slidably connected to the gantry and can reciprocate vertically along a first slide rail of the gantry, the lower half spherical tank is located inside the base, and a second slide rail for the gantry to reciprocate horizontally is provided on the periphery of the base;

[0006] The test platform is located inside the lower half spherical tank, and the test platform includes a battery fixing table, a battery failure triggering module, a sensor positioning frame, and cables. The cables include a first cable and a second cable. The battery fixing table is arranged at the center of the sphere of the lower half spherical tank, the sensor positioning frame is arranged around the periphery of the battery fixing table, and sensors are provided in different directions of the sensor positioning frame;

[0007] 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 under test when the battery under test is placed on the battery fixing platform and the upper half spherical tank body and the lower half spherical tank body are hermetically connected. If the monitoring value of the sensor meets the first preset condition, the operation of 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 values of the sensor between the corresponding moment of starting detection and the corresponding moment of the second preset condition are extracted, and the safety score of the battery under test is determined according to the monitoring values of the sensor and the weights corresponding to the monitoring values.

[0008] 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 of the circle.

[0009] Optionally, in some embodiments of the present application, the plurality of 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 the first partition of the circle, and the third positioning bracket and the fourth positioning bracket are located in the second partition of the circle.

[0010] Optionally, in some embodiments of the present application, the sensor types of the first positioning bracket and the third positioning bracket are the same, the sensor types of the second positioning bracket and the fourth positioning bracket are the same, and the sensor types of the first positioning bracket and the second positioning bracket are different.

[0011] Optionally, in some embodiments of the present application, the sensor includes a voltage sensor for monitoring the voltage change during the thermal runaway of the battery under test, a temperature sensor for monitoring the temperature change during the thermal runaway of the battery under test, an expansion force sensor for monitoring the expansion force change during the thermal runaway of the battery under test, a smoke sensor for monitoring the smoke generation amount during the thermal runaway of the battery under test, and a pressure sensor for monitoring the gas generation amount during the thermal runaway of the battery under test.

[0012] Optionally, in some embodiments of the present application, the sensor further includes a quality sensor for monitoring the pressure of the pressure relief valve eruption and data verification during the thermal runaway of the battery under test.

[0013] Optionally, in some embodiments of the present application, the battery failure trigger module includes an electric heating mechanism, an electric signal stimulation mechanism, a pressing mechanism disposed on the side of the battery fixing table, and a needle punching mechanism disposed below the battery fixing table.

[0014] In a second aspect, the present application provides a power battery safety detection method, which is used for the power battery safety detection device described in any one of the first aspects. The power battery safety detection method includes:

[0015] When the battery under test is placed on the battery fixing table and the upper half spherical tank body and the lower half spherical tank body are hermetically connected, control the working mode of the battery failure trigger module to cause thermal runaway of the battery under test;

[0016] If the monitoring value of the sensor satisfies the first preset condition, stop running the battery failure trigger module, and continuously collect the monitoring value of the sensor until the monitoring value of the sensor satisfies the second preset condition;

[0017] Extract the monitoring values of the sensor between the corresponding moment of starting the detection and the corresponding moment of the second preset condition, and determine the safety score of the battery under test according to the monitoring values of the sensor and the weights corresponding to the monitoring values.

[0018] In a third aspect, the present application provides a terminal device, which includes a processor and a memory. At least one instruction, at least one program, a code set or an instruction set is stored in the memory, 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.

[0019] 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.

[0020] It can be seen from the above technical solutions that the embodiments of the present application have the following advantages:

[0021] An embodiment of the present application provides a power battery safety detection device, a detection method, a terminal device, and a medium. By arranging a battery fixing platform in the lower half spherical tank of a closed spherical tank, the battery fixing platform is located at the center of the lower half spherical tank, and a 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. Thus, it is possible to directly monitor the distribution of each monitored value during the battery failure process in all directions by using the spherical boundary and sensors at different positions, without using the average value. At the same time, the upper half spherical tank and the lower half spherical tank can form a closed space, which helps to exclude external environmental interference, and the obtained monitored values are more accurate. Furthermore, based on the monitored values of the sensors and the weights corresponding to the monitored values, the safety score of the battery under test is determined, with strong reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0023] Figure 1 Schematic diagram of the overall structure of a power battery safety detection device provided by an embodiment of the present application;

[0024] Figure 2 A kind provided by an embodiment of the present application Figure 1 Schematic diagram of the sectional structure of the device shown;

[0025] Figure 3 Schematic diagram of the structure of a sensor positioning frame provided by an embodiment of the present application;

[0026] Figure 4 A kind provided by an embodiment of the present application Figure 1 Schematic diagram of the top view structure of the device shown;

[0027] Figure 5 Schematic diagram of the process flow of a power battery safety detection method provided by an embodiment of the present application;

[0028] Figure 6 Schematic diagram of the voltage monitoring value curve of a voltage sensor provided by an embodiment of the present application;

[0029] Figure 7 Schematic diagram of the temperature monitoring value curve of a first partition temperature sensor provided by an embodiment of the present application;

[0030] Figure 8 Schematic diagram of the smoke production monitoring value curve of a first partition smoke sensor provided by an embodiment of the present application;

[0031] Figure 9 Schematic diagram of the expansion force monitoring value curve of a first-zone expansion force sensor provided by an embodiment of the present application;

[0032] Figure 10 Block diagram of a terminal device provided by an embodiment of the present application.

[0033] Reference numerals:

[0034] 10 - Power battery safety detection device, 101 - Base, 102 - Sealed spherical tank, 1021 - Upper half spherical tank, 1022 - Lower half 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 implementation manners

[0035] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0036] To make the above objects, features, and advantages of the present application more obvious and understandable, the present application will be further described in detail below with reference to the accompanying drawings and specific implementation manners.

[0037] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The power battery safety detection device, detection method, terminal device, and medium provided by the embodiments of the present application will be elaborated in detail below. Figures 1 to 10 The power battery safety detection device, detection method, terminal device, and medium provided by the embodiments of the present application will be elaborated in detail below.

[0038] Please refer to Figure 1 , which is a schematic diagram of the overall structure of a power battery safety detection device provided by an embodiment of the present application. The power battery safety detection device 10 includes a base 101, a sealed spherical tank 102, a test platform 103, a gantry 104, and a control module (not shown in the figure). As Figure 2As shown in the figure, the sealed spherical tank body 102 includes an upper half spherical tank body 1021 and a lower half spherical tank body 1022. The upper half spherical tank body 1021 is slidably connected to the gantry 104 and can reciprocate vertically along the first slide rail of the gantry 104. The lower half spherical tank body 1022 is located inside the base 101. A second slide rail for the gantry 104 to reciprocate horizontally is provided on the periphery of the base 101. That is, the opening and closing of the upper half spherical tank body 1021 are realized through the vertical movement of the upper half spherical tank body 1021 and the horizontal movement of the gantry 104 itself. The movement process is controlled by a motor. The advantage of this setting is that compared with the traditional pop-up design, it can reduce the total floor space of the equipment and facilitate the operation of the test platform 103 inside the lower half spherical tank body 1022 by the staff.

[0039] In some embodiments of the present application, several attached locking wheels may be provided at the bottom of the base 101 to facilitate the transfer of the equipment. At the same time, control buttons may be provided on the periphery of the base 101, which can complete some operations such as the movement of the gantry 104, the opening and closing of the upper half spherical tank body 1021, and the manual selection of the working mode of the battery failure trigger module when operating independently of control modules such as computer equipment. In addition, a maintenance chamber may be provided below the base 101 to place communication modules, cables, etc., and a gas pipeline connected to the sealed spherical tank body 102 is provided. The pressure sensor is placed here, which can avoid the adverse effects of instantaneous combustion and explosion processes in the chamber on the pressure sensing. The total volume of the sealed spherical tank body 102 is 1150L. Compared with traditional cylindrical or square containers, it can significantly reduce the influence of the boundary shape on the internal parameter distribution of the container. Combined with a larger tank design (the maximum cross-sectional diameter of the sphere is 1300 mm, which is much larger than the size of the battery under test) and the arrangement of multiple-point sensors in the tank, the distribution laws of temperature, smoke, and gas inside the container can be accurately analyzed. Compared with the traditional method of only obtaining the average value of a single parameter inside the tank, it can better reproduce the battery failure in the actual scenario and analyze with higher spatial accuracy, which is beneficial for battery enterprises to improve products and prevent and dispose of failure-caused disasters. Among them, the upper half spherical tank body 1021 may be provided with a gas exchange channel, and the hole position is sealed. When the channel is closed, the airtightness of the tank body can be ensured. A plurality of dowel bolts are provided at the closing section with the lower half spherical tank body 1022 for position limitation, and together with the sealing rubber ring placed at the section, they jointly ensure the airtightness inside the sphere after closing, and can realize operations such as vacuum pumping, ventilation, and gas collection inside the tank when the channel is opened.

[0040] In some embodiments of the present application, the test platform 103 may include, but is not limited to, a battery fixing table, 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 table is arranged at the center of the sphere of the lower half spherical tank body 1022. The sensor positioning frame is arranged around the periphery of the battery fixing table, and sensors are provided in different directions of the sensor positioning frame. For example Figure 3 As shown, the support center a of the sensor positioning frame is located below the battery fixing table. The sensor positioning frame includes a plurality of positioning brackets b. The plurality of positioning brackets b are distributed in the radial direction of the circle formed with the support center a as the center, thereby enabling the positioning of each sensor in three-dimensional space and accurately collecting the temperature, smoke, and gas signals at multiple points inside the tank. Another example 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, and the third positioning bracket b3 and the fourth positioning bracket b4 are located in the second partition of the circle. The sensor types of the first positioning bracket b1 and the third positioning bracket b3 are the same, the sensor types of the second positioning bracket b2 and the fourth positioning bracket b4 are the same, and the sensor types of the first positioning bracket b1 and the second positioning bracket b2 are different, so as to be able to directly and comprehensively monitor the distribution of each monitored value during the battery failure process by using the spherical boundary and sensors at different positions. Further, the sensor types of different radial positions on the first positioning bracket b1 are the same, the sensor types of different radial positions on the second positioning bracket b2 are the same, the sensor types of different radial positions on the third positioning bracket b3 are the same, and the sensor types of different radial positions on the fourth positioning bracket b4 are the same. Thus, it is also possible to quickly detect and determine the distribution law of each monitored value during the thermal runaway process of the battery under test.

[0041] For another example, the sensors include, but are not limited to, a voltage sensor for monitoring the voltage change during the thermal runaway process of the battery under test, a temperature sensor for monitoring the temperature change during the thermal runaway process of the battery under test, a swelling force sensor for monitoring the swelling force change during the thermal runaway process of the battery under test, a smoke sensor (PM2.5, PM10) for monitoring the smoke generation amount during the thermal runaway process of the battery under test, and a pressure sensor for monitoring the gas generation amount during the thermal runaway process of the battery under test, etc. For example, the temperature rise rate is calculated by directly reading the real-time temperature through the temperature sensor, that is, calculating the first derivative of the real-time temperature with respect to time, and the sampling frequency of the sensor is 10 Hz. For another example, the gas generation amount and the gas generation rate are calculated through the reading of the pressure sensor. The gas generation amount V is calculated based on the ideal gas state equation pV = nRT, where p represents the reading of the pressure sensor, n represents the amount of substance of the gas (mol), R represents the molar gas constant (unit: J / (mol•K)), T represents the temperature (unit: K), and the gas generation rate is the first derivative of the gas volume with respect to time.

[0042] In addition to the above types, the sensors can also include a mass sensor for monitoring the ejection pressure and data verification of the pressure relief valve during the thermal runaway process of the battery under test, and a variety of gas sensors (CO, CO 2 、H 2 、CH 4 ). For example, if the battery under test is placed vertically, the pressure relief valve is vertically upward. If there is no valve ejection in the battery under test, the pressure received by the mass sensor set on the battery fixing table is equal to the gravity of the battery under test. If there is a valve ejection in the battery under test, the pressure received by the mass sensor is the sum of the gravity of the battery under test and the ejection pressure. Thus, the ejection pressure can be calculated based on the numerical change of the mass sensor at the moment of the pressure relief valve ejection, that is, ejection pressure = (reading of the mass sensor at the moment of ejection - initial reading of the mass sensor) * g, where g represents the acceleration due to gravity, taking 9.8 N / kg. At the same time, considering that the mass of the battery under test at the end state - the mass of the battery under test at the initial state = the total amount of emissions during the valve ejection period of the battery under test, and the total amount of emissions during the valve ejection period of the battery under test = the total smoke generation amount of the battery under test + the total gas generation amount of the battery under test, the deviation between the monitoring results of the mass sensor and the total monitoring results of the smoke sensor and the 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 spherical tank 1022 is relatively large, and local high temperatures often occur during battery explosion. All temperature sensors can meet the highest temperature requirements (1200 °C) during battery explosion. For other types of sensors, the placement position is at a certain distance from the battery under test, and the local high temperature will gradually cool down during the diffusion process. Therefore, the heat resistance of other types of sensors can meet the test requirements. For the protection against dust generated by the explosion, an isolation layer is set on the sensor housing to avoid the adverse effects of explosion products on the sensor, and the obtained monitoring values are more accurate.

[0043] For another example, the battery failure trigger module includes, but is not limited to, an electric heating mechanism, an electric signal stimulation mechanism, a pressing mechanism disposed on the side of the battery fixing platform, a needle punching mechanism under the battery fixing platform, etc. That is to say, the ways to trigger the failure of the battery under test include heating, electric signal stimulation, pressing, and needle punching. The working modes of the battery failure trigger module include single trigger and combined trigger. Among them, the electric heating mechanism may include an electric heating sheet, 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 trigger method, the electric heating sheet needs to be attached to the large surface of the battery under test and then a temperature sensor is arranged, and a battery fixture is installed as required; the electric signal stimulation mechanism needs to connect the channel wires reserved inside the tank body to the positive and negative electrodes of the battery under test respectively, and control an electrochemical workstation or a charge and discharge tester through a control module such as a computer device to trigger the failure of the battery under test in ways such as overcharging, over-discharging, and over-current (voltage and current can be accurately controlled); in the pressing mechanism, the shape of the pressing block can be replaced, and the moving speed of the pressing block is controlled by a program; and, the needle punching mechanism can replace different needles according to the test requirements (steel needles or insulating needles, the tip diameter and cone angle can be adjusted), and control the moving speed and displacement of the needle through a program to achieve high-precision shallow punching (the minimum displacement is 0.1 mm, and the control accuracy can reach the electrode sheet level).

[0044] In some embodiments of the present application, the control module can 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. When the battery under test is placed on the battery fixing platform and the upper spherical tank body 1021 and the lower spherical tank body 1022 are hermetically connected, the control module can control the working mode of the battery failure trigger module to cause thermal runaway of the battery under test. If the monitoring value of the sensor meets the first preset condition, for example, the first preset condition includes, but is not limited to, the temperature exceeding the first preset temperature threshold, the temperature rise rate reaching the preset temperature rise rate threshold, and the voltage dropping to the preset voltage threshold, etc., then stop running the battery failure trigger module and continuously collect the monitoring value of the sensor until the monitoring value of the sensor meets the second preset condition, for example, the second preset condition includes, but is not limited to, the temperature dropping to the second preset temperature threshold, such as the second preset temperature threshold being room temperature. Furthermore, extract the monitoring values of the sensor between the corresponding moment when the detection starts and the corresponding moment of the second preset condition, and determine the safety score of the battery under test based on the monitoring value of the sensor and the weight corresponding to the monitoring value. For example, the corresponding moment when the detection starts is the time point corresponding to the battery under test being placed on the battery fixing platform and the upper spherical tank body 1021 and the lower spherical tank body 1022 being hermetically connected.

[0045] The power battery safety detection device provided by the embodiment of the present application sets a battery fixing platform in the lower half spherical tank of the closed spherical tank. The battery fixing platform is located at the center of the lower half spherical tank, and 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. Thus, it can directly monitor the distribution of each monitored value during the battery failure process in all directions by using the spherical boundary and sensors at different positions, without using the average value. At the same time, the upper half spherical tank and the lower half spherical tank can form a closed space, which helps to exclude external environmental interference, and the obtained monitored values are more accurate. Furthermore, based on the monitored values of the sensors and the weights corresponding to the monitored values, the safety score of the battery under test is determined, with strong reliability.

[0046] Based on the foregoing embodiments, the embodiment of the present application provides a power battery safety detection method, which can be used for Figures 1 to 4 the power battery safety detection device 10 corresponding to the embodiment. Please refer to Figure 5 , which is a schematic flowchart of a power battery safety detection method provided by the embodiment of the present application. The method specifically includes the following steps:

[0047] S101, when the battery under test is placed on the battery fixing platform and the upper half spherical tank and the lower half spherical tank are hermetically connected, control the working mode of the battery failure trigger module to cause thermal runaway of the battery under test.

[0048] Exemplarily, before the test, open the closed spherical tank 102, place the battery under test on the battery fixing platform, connect the electrical signal acquisition line, and turn on the sensors to verify that the signal acquisition is normal. Then, through the horizontal movement of the gantry 104 and the vertical movement of the upper half spherical tank 1021, the upper half spherical tank 1021 and the lower half spherical tank 1022 are hermetically connected, and a plurality of dowel bolts are arranged at the closing section of the upper half spherical tank 1021 and the lower half spherical tank 1022 for limiting, and together with the sealing rubber ring placed at the section, ensure the airtightness inside the sphere after closing. In addition, the working modes of the battery failure trigger module include single trigger and combined trigger, and the ways to trigger the failure of the battery under test include at least one of heating, electrical signal stimulation, extrusion, and acupuncture.

[0049] S102, if the monitored value of the sensor meets the first preset condition, stop running the battery failure trigger module, and continuously collect the monitored value of the sensor until the monitored value of the sensor meets the second preset condition.

[0050] Exemplarily, when the temperature monitoring value obtained by the temperature sensor exceeds the first preset temperature threshold, it indicates that the battery under test has reached the thermal runaway state, and it is necessary to stop the operation of the battery failure trigger module. 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 under test has ended. After the temperature inside the sealed spherical tank 102 drops to room temperature, the flue gas in the tank is discharged through the gas exchange channel of the upper half spherical tank 1021, the tank is opened, the battery under test is taken out, and the test is stopped after cleaning the tank.

[0051] S103. Extract the monitoring values of the sensor between the corresponding time when the detection starts and the corresponding time of the second preset condition, and determine the safety score of the battery under test according to the monitoring values of the sensor and the weights corresponding to the monitoring values.

[0052] Exemplarily, considering the phenomena such as defects / damages, a small amount of liquid leakage / blister film bursting, serious liquid leakage / blister film bursting, rupture, fire or smoke, and explosion that occur successively during the failure of the battery under test, the power battery safety detection device 10 according to the embodiments of the present application monitors the real-time state of the battery under test 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. One voltage sensor can be shared, and the voltage monitoring value curve of the voltage sensor is as Figure 6 shown, where the temperature monitoring value curve of the first partition temperature sensor is as Figure 7 shown, the smoke production monitoring value curve of the smoke sensor is as Figure 8 shown, and the expansion force monitoring value curve of the expansion force sensor is as Figure 9 shown. The score of the voltage monitoring value is

[0053] (1)

[0054] In formula (1), represents the current voltage monitoring value, with the unit of volt; represents the initial voltage monitoring value, with the unit of volt; the weight corresponding to the voltage monitoring value can be 20%.

[0055] The score of the temperature monitoring value is

[0056] (2)

[0057] In formula (2), represents the current temperature, with the unit of °C; the weight corresponding to the temperature monitoring value can be 40%.

[0058] The score of the smoke production monitoring value is

[0059] (3)

[0060] In formula (3), Indicates the smoke production, in ppm; the weight corresponding to the monitored value of smoke production can be 35%.

[0061] The score of the monitored value of the swelling force is

[0062] (4)

[0063] In formula (4), Indicates the current swelling force, in N; Indicates the initial swelling force, in N; the weight corresponding to the monitored value of the swelling force can be 5%. It should be noted that the weights corresponding to the monitored values of voltage, temperature, smoke production, and swelling force can be determined based on a large amount of historical detection data of the same type of battery for the battery to be tested. That is to say, each weight can continuously learn and be dynamically adjusted.

[0064] Furthermore, the safety score of the first partition is = 0.2 * + 0.4 * +

[0065] 0.35 * + 0.05 * , and the safety score of the second partition The calculation principle is the same. After obtaining the safety scores of each partition, based on the weight corresponding to the partition, the safety score of the battery to be tested is determined. For example, the safety score of the battery to be tested = 0.45 * + 0.55 * . Of course, the circle formed with the support center a as the center can also be evenly divided into three partitions, four partitions, five partitions, etc. The sensor types are the same between partitions and different within partitions, and the weights corresponding to each partition can be determined according to the simulation test of the battery to be tested. Thus, the simulation test and the actual test can be combined, and the obtained results are more accurate.

[0066] It should be noted that for the descriptions of the same steps and the same content in this embodiment and other embodiments, reference can be made to the descriptions in other embodiments, and details will not be repeated here.

[0067] The power battery safety detection method provided by the embodiment of the present application sets a battery fixing platform in the lower half spherical tank of a closed spherical tank. The battery fixing platform is located at the center of the sphere of the lower half spherical tank, and a 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. Thus, it is possible to directly and comprehensively monitor the distribution of each monitored value during the battery failure process by using the spherical boundary and sensors at different positions, without using the average value. At the same time, the upper half spherical tank and the lower half spherical tank can form a closed space, which helps to exclude external environmental interference, and the obtained monitored values are more accurate. Furthermore, based on the monitored values of the sensors and the weights corresponding to the monitored values, the safety score of the battery under test is determined, with strong reliability.

[0068] As another aspect, the embodiment of the present application provides a terminal device. Please refer to Figure 10 , the terminal device 20 may include a processor 21 and a memory 22. At least one instruction, at least one program, a code set or an instruction set is stored in the memory 22, and the instruction, program, code set or instruction set is loaded and executed by the processor 21 to implement Figures 5 to 9 the steps of the power battery safety detection method in the corresponding embodiment.

[0069] As yet another aspect, the embodiment of the present application provides a computer-readable storage medium for storing program code, and the program code is used to execute any one of the implementation manners in the foregoing Figures 5 to 9 corresponding embodiments of the power battery safety detection method.

[0070] 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 foregoing method embodiments, and will not be elaborated here.

[0071] In several embodiments provided by 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 merely illustrative. For example, the division of the modules is only a logical function division, and there may be other division methods in actual implementation. For example, 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 displayed or discussed couplings or direct couplings or communication connections to each other can be through some interfaces, indirect couplings or communication connections of devices or modules, and can be in electrical, mechanical or other forms. The modules described as separate components may or may not be physically separated, and the components shown as modules may or may not be physical units, that is, they can be located in one place, or distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0072] In addition, each functional module in the various embodiments of the present application may be integrated into a processing unit, or each module may exist physically alone, 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. When 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.

[0073] Based on such an understanding, the technical solution of the present application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, may be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the power battery safety detection method in the various embodiments of the present application. The aforementioned storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memories (ROMs), random access memories (RAMs), magnetic disks, or optical discs that can store program codes.

[0074] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, 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, it should be considered as the scope described in this specification.

[0075] Specific examples are used herein to elaborate on the principles and implementation manners of the present application. The description of the above embodiments is only used to help understand the method and its core idea of the present application; at the same time, for those of ordinary skill in the art, according to the idea of the present application, there will be changes in the specific implementation manners and application scopes. In summary, the content of this specification should not be construed as a limitation to the present 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; 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, the weight corresponding to the monitoring value, and the partition weight corresponding to the sensor; The support center (a) of the sensor positioning frame is located below the battery fixing platform, and the sensor positioning frame includes a plurality of positioning frames (b), and the plurality of positioning frames (b) are distributed in the radial direction of a circle formed with the support center (a) as the center; the plurality of positioning frames (b) include a first positioning frame (b1), a second positioning frame (b2), a third positioning frame (b3) and a fourth positioning frame (b4), the first positioning frame (b1) and the second positioning frame (b2) are located in a first partition of the circle, and the third positioning frame (b3) and the fourth positioning frame (b4) are located in a second partition of the circle; the sensor type of the first positioning frame (b1) is the same as that of the The sensor type of the third positioning bracket (b3) is the same, 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); the sensors 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 a pressure sensor for monitoring gas production during thermal runaway of the battery to be tested.

2. The power battery safety detection device according to claim 1, 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.

3. The power battery safety detection device according to claim 1, 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.

4. 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 3, 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, the weight corresponding to the monitoring value and the partition weight corresponding to the sensor.

5. 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 4.

6. 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 4.

Images