Lithium ion battery thermal runaway testing device based on array temperature sensor

Abstract

The invention discloses a lithium ion battery thermal runaway testing device based on an array temperature sensor, which is applied to the field of lithium battery performance testing, and comprises a device body, and through the arrangement of an array temperature sensing assembly and a temperature auxiliary monitoring system, when a lithium ion battery thermal runaway test is carried out, the array temperature sensor can detect the thermal runaway of the lithium ion battery. The temperature distribution condition in the test cavity can be accurately mastered in real time, heat energy generated by the battery and external heat energy applied in the test process can be distinguished, measurement errors caused by spontaneous heating of the battery are effectively reduced, the temperature control precision and the data tracking accuracy in the test process are remarkably improved, and the test efficiency is improved. The reliability and repeatability of the test data are enhanced, the monitoring efficiency of the thermal runaway state of the lithium ion battery can be greatly improved, the device body can be powerfully assisted in accurately positioning the origin position of the thermal failure of the battery, the data analysis difficulty is reduced, and the accuracy of the thermal runaway test implemented by the device body and the reliability of the test data are comprehensively improved.

Description

Technical Field

[0001] This invention relates to the field of lithium battery performance testing, and in particular to a lithium-ion battery thermal runaway testing device based on an array temperature sensor. Background Technology

[0002] Lithium-ion battery thermal runaway testing is a core method for assessing their safety and stability. Its main purpose is to simulate dangerous reactions that may occur under extreme operating conditions (such as fire and explosion), thereby accurately identifying potential risks. To achieve this goal, modern testing equipment is generally equipped with multi-type sensor arrays, among which the application of array temperature sensors is particularly crucial. It not only significantly improves the accuracy and efficiency of testing, but also provides data support for the formulation of safety protection strategies, rapid fault diagnosis, and iterative performance optimization.

[0003] Existing technology discloses CN117805632A, a lithium-ion power battery thermal runaway safety testing device. By setting up a test extinguishing mechanism, a piston slides inside the test chamber, pressurizing water at the bottom of the chamber through the inlet and extinguishing pipe to the outlet, thereby extinguishing the fire in the lithium-ion power battery. CN113311339A also discloses a lithium-ion battery thermal runaway testing device, which can effectively detect the dynamic parameters of gas flow during thermal runaway and thermal propagation gas eruption in individual lithium-ion battery cells or battery modules. It is easy to operate and has high testing efficiency.

[0004] In actual testing, when a lithium-ion battery experiences overheating, it continuously releases a large amount of heat, making it difficult for the subsequent temperature control system to achieve efficient and accurate temperature regulation and data tracking, ultimately affecting the reliability of the test data. Therefore, this application proposes a lithium-ion battery thermal runaway testing device based on an array temperature sensor, which can monitor and distinguish the feedback data of the battery's own temperature rise from the contribution of external heating sources in real time, effectively reducing temperature control errors and monitoring deviations, and significantly improving the reliability and repeatability of the test data. Summary of the Invention

[0005] The core of this invention lies in solving the problem in existing technologies where the continuous release of heat energy by lithium-ion batteries makes it difficult for subsequent temperature control systems to achieve efficient and accurate temperature regulation and data tracking, ultimately affecting the reliability of test data. At the same time, it can adapt to different types of lithium-ion batteries and provide temperature feedback, thus expanding the application range of the testing device.

[0006] To solve the above problems, the present invention adopts the following technical solution.

[0007] A lithium-ion battery thermal runaway testing device based on an array temperature sensor includes a device body. The device body has a control panel, a test chamber, and a temperature control chamber arranged from top to bottom. A protective cage is installed inside the test chamber. Multiple array temperature sensing components are evenly installed on the protective cage. Each array temperature sensing component includes a heat insulation shell embedded in the protective cage. Both the inner and outer ends of the heat insulation shell are fixedly connected to heat-conducting plates. Multiple thermal driving elements are fixedly connected to the ends of the two heat-conducting plates that are close to each other. An isolation slider is slidably arranged inside the heat insulation shell. The ends of the thermal driving elements on both the inner and outer sides that are close to each other extend into the heat insulation shell and cooperate with the isolation slider. A pair of balance sensing elements are arranged on the upper and lower inner walls of the heat insulation shell, and the isolation slider is located between the two balance sensing elements. The control panel is equipped with a temperature auxiliary monitoring system, which includes a temperature auxiliary processing unit. The input of the temperature auxiliary processing unit is connected to a temperature balance acquisition unit and a temperature data acquisition unit. The output of the temperature auxiliary processing unit is connected to a temperature feedback unit. The input of the temperature balance acquisition unit is connected to the signal of the balance sensing element. The input of the temperature data acquisition unit is connected to the signal of the infrared temperature probe installed on the inner wall of the test chamber. The output of the temperature feedback unit is connected to the signal of the temperature control chamber.

[0008] Furthermore, a synchronization plate is fixedly connected to the end of multiple heat-driving components located on the same side away from the heat-conducting plate, and the end of the synchronization plate away from the heat-driving component is fixedly connected to the isolation slider.

[0009] Furthermore, the thermal drive component includes a corrugated guide tube fixedly disposed between the insulation shell and the synchronization plate, an elastic sleeve fixedly connected inside the corrugated guide tube, and the elastic sleeve being filled with a thermosensitive gas.

[0010] Furthermore, the balancing sensing element includes linkage blocks fixedly installed at the upper and lower ends of the synchronization plate, and the linkage blocks are fixedly connected to the isolation slider. An isolation sleeve is fixedly connected to the end of the linkage block away from the isolation slider. A limit block is fixedly connected to the end of the isolation sleeve away from the isolation slider, and the limit block is fixedly connected to the inner wall of the heat insulation shell. Sensing strips are fixedly connected to both the inner wall of the isolation sleeve away from the isolation slider and the inner wall of the isolation sleeve close to the isolation slider. The input end of the temperature balancing acquisition unit is connected to the signal of the sensing strips.

[0011] Furthermore, the temperature balance acquisition unit includes an inner sensing acquisition module, an outer sensing acquisition module, and a sensing positioning and recognition module. The input end of the inner sensing acquisition module is connected to the sensing strip signal located inside the isolation slider, the input end of the outer sensing acquisition module is connected to the sensing strip signal located outside the isolation slider, and the input end of the sensing positioning and recognition module is connected to the locator signal embedded in the isolation slider.

[0012] Furthermore, the input terminal of the temperature auxiliary processing unit is also connected to a parameter setting unit, the input terminal of which is connected to the control panel signal, and the output terminal of the temperature auxiliary processing unit is also connected to a temperature sensing display unit and an abnormality warning unit. The output terminal of the temperature sensing display unit is connected to the control panel signal, and the output terminal of the abnormality warning unit is connected to the alarm signal installed on the control panel.

[0013] Meanwhile, a graphite elastic hinge is fixedly connected to the inner end of the heat-conducting plate located on the inner side. An extension guide plate is fixedly connected to the inner end of the graphite elastic hinge. Multiple adapter clips located on the outer side of the graphite elastic hinge are fixedly connected to the end of the extension guide plate near the heat-conducting plate. A spacing adjustment screw is rotatably connected to the end of the adapter clip near the heat-conducting plate. The end of the spacing adjustment screw near the heat-conducting plate passes through the heat-conducting plate and extends into the insulation shell. Multiple threaded sleeves corresponding to the spacing adjustment screw are fixedly connected to the inner wall of the heat-conducting plate near the inner side of the heat-conducting plate, and the threaded sleeves are threaded onto the outer side of the spacing adjustment screw.

[0014] Furthermore, the graphite elastic hinge is made of multiple graphite strips hinged together. By changing the hinge angle between the multiple graphite strips, the extension guide plate can be driven to produce corresponding displacement.

[0015] Compared with the prior art, the advantages of this invention are: (1) By setting up an array of temperature sensing components and a temperature-assisted monitoring system, this solution can accurately grasp the temperature distribution inside the test chamber in real time when conducting thermal runaway tests on lithium-ion batteries. It can distinguish between the heat energy generated by the battery itself and the external heat energy applied during the test, effectively reducing the measurement error caused by battery self-heating. This not only significantly improves the temperature control accuracy and data tracking accuracy during the test process, but also enhances the reliability and repeatability of the test data. It can also greatly improve the monitoring efficiency of the thermal runaway state of lithium-ion batteries, effectively assisting the device body in accurately locating the origin of battery thermal failure, reducing the difficulty of data analysis, and thus comprehensively improving the accuracy of the device body in carrying out thermal runaway tests and the reliability of test data.

[0016] (2) The setting of graphite elastic hinge and extension guide plate significantly enhances the sensitivity of lithium-ion battery thermal runaway monitoring. With the efficient heat conduction mechanism of direct contact, it effectively improves the heat transfer efficiency and provides strong support for accurately tracking the source of thermal runaway, thereby greatly improving the accuracy of test data. At the same time, the setting of spacing adjustment screw and threaded sleeve realizes the precise control of the extension length of the extension guide plate, which not only expands the adaptability range of contact temperature sensing, making it flexibly adaptable to lithium-ion batteries of different specifications, but also significantly improves the application economy and practical value of the device body. Attached Figure Description

[0017] Figure 1This is an isometric view of the device body of the present invention; Figure 2 This is the control logic diagram of the temperature auxiliary monitoring system of the present invention; Figure 3 This is an exploded view of the array temperature sensing component of the present invention; Figure 4 This is a diagram showing the changing states of the array temperature sensing component during the testing process of this invention; Figure 5 This is a front cross-sectional view of the array temperature sensing component of the present invention; Figure 6 This is a state diagram of the array temperature sensing component during the initial heating of the present invention; Figure 7 This is a state diagram of the array temperature sensing component during temperature equalization according to the present invention; Figure 8 This is a state diagram of the array temperature sensing component during the self-heating of the lithium-ion battery according to the present invention; Figure 9 This is a state diagram of the array temperature sensing component during thermal runaway of a lithium-ion battery according to the present invention. Figure 10 This is a front view of the device body during testing of the present invention; Figure 11 This is a state diagram of the array temperature sensing component of the present invention when it comes into contact with a lithium-ion battery; Figure 12 For the present invention Figure 11 Enlarged view of a portion of point A in the middle.

[0018] Explanation of the labels in the diagram: 1. Device body, 11. Test chamber, 12. Control panel, 13. Temperature control chamber, 2. Protective cage, 3. Array temperature sensing component, 31. Insulation shell, 32. Heat-conducting plate, 33. Heat-driving component, 331. Corrugated guide tube, 332. Elastic sleeve, 333. Thermosensitive gas, 34. Synchronization plate, 35. Isolation slider, 36. Balance sensing component, 361. Limiting block, 362. Linkage block, 363. Isolation sleeve, 364. Sensing strip, 4. Spacing adjustment screw, 41. Threaded sleeve, 42. Adapter clip, 5. Extension guide plate, 51. Graphite elastic hinge. Detailed Implementation

[0019] The technical solution will now be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention.

[0020] First implementation method: Please see Figure 1 - Figure 10A lithium-ion battery thermal runaway testing device based on an array temperature sensor includes a device body 1. The device body 1 is provided with a control panel 12, a test chamber 11 and a temperature control chamber 13 from top to bottom. A protective cage 2 is installed in the test chamber 11. Multiple array temperature sensing components 3 are uniformly installed on the protective cage 2. The array temperature sensing components 3 include a heat insulation shell 31 embedded in the protective cage 2. Both the inner and outer ends of the heat insulation shell 31 are fixedly connected to heat-conducting plates 32. Multiple heat-driving components 33 are fixedly connected to the ends of the two heat-conducting plates 32 that are close to each other. An isolation slider 35 is slidably arranged inside the heat insulation shell 31. The ends of the heat-driving components 33 on both the inner and outer sides that are close to each other extend into the heat insulation shell 31 and cooperate with the isolation slider 35. A pair of balance sensing elements 36 are provided on the upper and lower inner walls of the heat insulation shell 31, and the isolation slider 35 is located between the two balance sensing elements 36. The control panel 12 is equipped with a temperature auxiliary monitoring system, which includes a temperature auxiliary processing unit. The input of the temperature auxiliary processing unit is connected to a temperature balance acquisition unit and a temperature data acquisition unit. The output of the temperature auxiliary processing unit is connected to a temperature feedback unit. The input of the temperature balance acquisition unit is connected to the balance sensor 36. The input of the temperature data acquisition unit is connected to the infrared temperature probe located on the inner wall of the test chamber 11. The output of the temperature feedback unit is connected to the temperature control chamber 13. Through the configuration of the array temperature sensing component 3 and the temperature auxiliary monitoring system, the lithium-ion battery thermal... During runaway testing, the temperature distribution inside the test chamber 11 can be accurately monitored in real time. It can distinguish between the heat energy generated by the battery itself and the external heat energy applied during the test, effectively reducing measurement errors caused by battery self-heating. This not only significantly improves the temperature control accuracy and data tracking accuracy during the test process, enhancing the reliability and repeatability of the test data, but also greatly improves the monitoring efficiency of lithium-ion battery thermal runaway state. It effectively assists the device body 1 in accurately locating the origin of battery thermal failure, reducing the difficulty of data analysis, and thus comprehensively improving the accuracy of thermal runaway testing and the reliability of test data.

[0021] Please see Figure 1 - Figure 10 A synchronization plate 34 is fixedly connected to the end of multiple thermally driven components 33 located on the same side away from the heat-conducting plate 32. The end of the synchronization plate 34 away from the thermally driven components 33 is fixedly connected to the isolation slider 35. Through the cooperation of the synchronization plate 34 and the thermally driven components 33, an efficient linkage mechanism is formed among the multiple thermally driven components 33, which significantly improves the operating efficiency and thermal response rate of the thermally driven components 33. This not only enhances the ability to identify the heat generation behavior of the lithium-ion battery itself, but also further improves the accuracy of the test data while ensuring precise control of the test temperature.

[0022] Please see Figure 5The thermal drive component 33 includes a corrugated guide tube 331 fixedly disposed between the heat insulation shell 31 and the synchronization plate 34. An elastic sleeve 332 is fixedly connected inside the corrugated guide tube 331. The elastic sleeve 332 is filled with a thermosensitive gas 333, which is a non-flammable gas, preferably helium. The corrugated guide tube 331 can precisely constrain and guide the thermal deformation process of the thermosensitive gas 333 inside the elastic sleeve 332, so that the thermal drive component 33 can drive the synchronization plate 34 to move smoothly along the axial direction, thereby ensuring the reliable effectiveness of the induction triggering mechanism. In addition, the structural design of multiple elastic sleeves 332 can significantly improve the thermal deformation response efficiency of the thermal drive component 33, enhance the sensing sensitivity of the self-generated heat of the lithium-ion battery, and thus optimize the subsequent data tracking and precise positioning capabilities for the self-heating source, achieving higher efficiency and higher accuracy in analysis and judgment.

[0023] Please see Figure 2 and Figure 5 The balancing sensing element 36 includes linkage blocks 362 fixedly disposed at the upper and lower ends of the synchronization plate 34, and the linkage blocks 362 are fixedly connected to the isolation slider 35. An isolation sleeve 363 is fixedly connected to the end of the linkage block 362 away from the isolation slider 35, and a limit block 361 is fixedly connected to the end of the isolation sleeve 363 away from the isolation slider 35. The limit block 361 is fixedly connected to the inner wall of the heat insulation shell 31. Sensing strips 364 are fixedly connected to both the inner wall of the isolation sleeve 363 away from the isolation slider 35 and the inner wall of the isolation sleeve 363 near the isolation slider 35. The input end of the temperature balancing acquisition unit is connected to the sensing strips 364. The signal connection and isolation sleeve 363 provide effective protection for the linkage block 362, resisting the thermal damage caused by the test temperature and the high temperature generated by the subsequent thermal runaway of the lithium-ion battery, thereby ensuring its long-term stable operation. At the same time, the temperature balance acquisition unit and the sensing strip 364 work together to monitor and intuitively display the temperature changes inside the test chamber 11 in real time, accurately assist in judging the state of each stage in the test process, clearly distinguish the battery's own temperature rise data from the contribution of external heating sources, thereby reducing temperature control errors and monitoring deviations, and comprehensively improving the reliability and repeatability of test data.

[0024] Please see Figure 1 and Figure 2The temperature-sensing balance acquisition unit includes an inner sensing acquisition module, an outer sensing acquisition module, and a sensing positioning and recognition module. The input end of the inner sensing acquisition module is connected to the sensing strip 364 located inside the isolation slider 35, and the input end of the outer sensing acquisition module is connected to the sensing strip 364 located outside the isolation slider 35. The input end of the sensing positioning and recognition module is connected to the locator embedded in the isolation slider 35. The coordinated configuration of the inner sensing acquisition module, the outer sensing acquisition module, and the sensing positioning and recognition module can not only realize the classification, sensing, and acquisition of test temperature and battery self-heating data, but also transmit position information in real time after the sensing mechanism is triggered. This helps the temperature auxiliary processing unit to present temperature parameters and heat source location in real time, significantly improving the positioning accuracy of data tracking, and thus comprehensively enhancing the accuracy and reliability of test data.

[0025] Please see Figure 1 and Figure 2 The input terminal of the temperature auxiliary processing unit is also connected to a parameter setting unit, and the input terminal of the parameter setting unit is connected to the control panel 12 via a signal. The output terminal of the temperature auxiliary processing unit is also connected to a temperature sensing display unit and an abnormality warning unit. The output terminal of the temperature sensing display unit is connected to the control panel 12 via a signal, and the output terminal of the abnormality warning unit is connected to the alarm signal set on the control panel 12.

[0026] Please see Figure 1 - Figure 10 During the application of the device body 1, the tester inputs parameter data about the test to the parameter setting unit through the control panel 12. This parameter data includes, but is not limited to, test temperature data, temperature gradient, lithium-ion battery specifications, lithium-ion battery heat resistance parameters, and thermal runaway protection temperature. The parameter setting unit transmits these parameter data to the temperature auxiliary processing unit, which stores, analyzes, and applies this data.

[0027] The tester places the lithium-ion battery to be tested inside the protective cage 2, closes the door of the test chamber 11, and starts the device body 1 to perform a thermal runaway test. The temperature control chamber 13 can control the temperature inside the test chamber 11 according to the set thermal runaway test program, so that the temperature inside the test chamber 11 rises, and the heat is continuously conducted to the lithium-ion battery through the protective cage 2. At this time, the infrared temperature sensor on the inner wall of the test chamber 11 collects the data inside the test chamber 11, and transmits the temperature in real time to the temperature auxiliary processing unit through the temperature data acquisition unit, so that the temperature auxiliary processing unit can determine the test stage at this time based on the temperature data.

[0028] During the initial heating stage, the array of temperature sensing components 3 installed on the protective cage 2 can sense the temperature uniformity of the inner and outer ends of the protective cage 2. The heat at the outer end of the protective cage 2 acts on the heat-conducting plate 32 at the corresponding position, and the heat is transferred to the heat-sensitive gas 333 through the temperature conduction of the heat-conducting plate 32. The heat-sensitive gas 333 absorbs heat and undergoes thermal expansion, and then elongates under the restriction and drive of the corrugated guide tube 331 and the elastic sleeve 332. This pushes the synchronous plate 34 connected to it, so that the synchronous plate 34 acts on the isolation slider 35 to move inward. The heat located at the inner end of the protective cage 2 acts on the corresponding heat-conducting plate 32, and the heat is transferred to the heat-sensitive gas 333 through the temperature conduction of the heat-conducting plate 32. The heat-sensitive gas 333 absorbs heat and generates thermal expansion, and then generates elongation deformation under the restriction and drive of the corrugated guide tube 331 and the elastic sleeve 332, which pushes the synchronous plate 34 connected to it, so that the synchronous plate 34 acts on the isolation slider 35 to move towards the outer end. However, when the heat at the inner end is insufficient, it may not be able to drive the heat-sensitive gas 333 to generate an effective thermal expansion effect. Because heat conduction has a certain delay, the temperature at the inner end of the protective cage 2 is lower than the temperature at the outer end during the initial heating stage. Therefore, the force driving the isolation slider 35 is greater at the outer end than at the inner end, causing the isolation slider 35 to move inwards. This moves the linkage block 362 at the inner end, causing the two sensing strips 364 inside the inner isolation sleeve 363 to come into contact, triggering the inner sensing acquisition module and the sensing positioning and recognition module. These modules then transmit the corresponding temperature data to the temperature auxiliary unit, which processes the data accordingly. The signal triggered by the inner end and the data at the corresponding trigger position, together with the temperature data transmitted by the temperature data acquisition unit, analyze the temperature uniformity and actual temperature control status within the test chamber 11. Then, the feedback data is transmitted to the temperature feedback unit, which transmits the data to the temperature control chamber 13. The temperature control chamber 13 can adjust the test temperature within the test chamber 11 based on the feedback data to ensure the effectiveness and accuracy of the test temperature control. Furthermore, the temperature auxiliary processing unit also transmits the current test stage to the control panel 12 through the temperature sensing display unit, facilitating data observation and analysis by the test personnel.

[0029] During the mid-stage of heating, the heat at the outer end of the protective cage 2 acts on the corresponding heat-conducting plate 32, and the heat is transferred to the heat-sensitive gas 333 through the temperature conduction of the heat-conducting plate 32. After absorbing heat, the heat-sensitive gas 333 undergoes thermal expansion, and then elongates under the restriction and drive of the corrugated guide tube 331 and the elastic sleeve 332, pushing the synchronous plate 34 connected to it, so that the synchronous plate 34 acts on the isolation slider 35 to move towards the inner end; the heat at the inner end of the protective cage 2 acts on the corresponding heat-conducting plate 32, and the heat is transferred to the heat-sensitive gas 333 through the temperature conduction of the heat-conducting plate 32. After absorbing heat, the heat-sensitive gas 333 undergoes thermal expansion, and then elongates under the restriction and drive of the corrugated guide tube 331 and the elastic sleeve 332, pushing the synchronous plate 34 connected to it, so that the synchronous plate 34 acts on the isolation slider 35 to move towards the outer end; At this time, the temperature at the inner and outer ends of the protective cage 2 gradually becomes uniform under the continuous temperature action. The force that pushes the isolation slider 35 to move is: the external pushing force is equal to the internal pushing force. Therefore, the isolation slider 35 remains in the central position within the device body 1 and does not move the linkage blocks 362 on the inner and outer sides. The sensing strips 364 in the isolation sleeves 363 on the inner and outer sides are disconnected. The temperature auxiliary processing unit does not receive any temperature sensing data. The temperature auxiliary processing unit combines the temperature data transmitted by the temperature data acquisition unit to analyze the temperature uniformity and actual temperature control status in the test chamber 11 at this time. Then, it transmits the feedback data to the temperature feedback unit, so that the temperature feedback unit transmits the data to the temperature control chamber 13. The temperature control chamber 13 can maintain and control the test temperature in the test chamber 11 according to the feedback data, so that the lithium-ion battery is continuously in a high temperature state. In addition, the temperature auxiliary processing unit also transmits the current test stage to the control panel 12 through the temperature sensing display unit, so that the test personnel can observe and analyze the data.

[0030] During the continuous heat preservation phase, the lithium-ion battery gradually generates heat, showing signs of thermal runaway. The heat-conducting plate 32, located near the heat-generating area of ​​the lithium-ion battery, further transfers heat to the thermistor gas 333, causing it to absorb heat and expand. Under the constraint and movement of the corrugated guide tube 331 and the elastic sleeve 332, it undergoes elongation deformation, pushing the synchronizing plate 34 connected to it. This causes the synchronizing plate 34 to move the isolation slider 35 outwards. Since the external temperature remains constant, the force pushing the isolation slider 35 is less than the inner force, resulting in the slider 35 moving outwards. This movement causes the linkage block 362 located at the outer end to move, causing the two sensing strips 364 located inside the outer isolation sleeve 363 to come into contact. The external sensing acquisition module and the sensing positioning and recognition module are triggered, and the external sensing acquisition module and the sensing positioning and recognition module transmit the corresponding temperature sensing data to the temperature auxiliary unit. The temperature auxiliary processing unit analyzes the state of the lithium-ion battery at this time and the location of its own heating based on the signal triggered by the external end and the data at the corresponding trigger position, and feeds back the analysis data to the temperature feedback unit. The temperature feedback unit transmits the data to the temperature control cavity 13. The temperature control test system in the temperature control cavity 13 can track the source of thermal runaway of the lithium-ion battery based on the received data. On the basis of accurately distinguishing the battery's own heating data and the contribution value of the external heating source, it not only effectively reduces the temperature control error and monitoring deviation, but also significantly improves the monitoring efficiency and data tracking accuracy of the signs of thermal runaway of lithium-ion batteries. It should be noted that the temperature control testing system is an existing component of the device body 1. It is directly referenced here without any changes to its structure and principle. Those skilled in the art can select it according to actual needs, so it will not be described in detail here.

[0031] As the lithium-ion battery continuously generates heat, causing more than half of the array temperature sensing components 3 to transmit temperature data to the temperature auxiliary processing unit through the external sensing acquisition module and the sensing positioning and identification module, the temperature auxiliary processing unit determines that the lithium-ion battery is in a thermal runaway state. While analyzing and processing the test data, it can also stop the temperature control cavity 13's heat preservation action based on the feedback data transmitted to the temperature control cavity 13 through the temperature feedback unit. Simultaneously, the temperature auxiliary processing unit also transmits temperature sensing data and runaway warning data to the control panel 12 through the temperature sensing display unit and the abnormal warning unit, respectively, activating the alarm on the control panel 12 to remind test personnel to stay away from the device body 1, avoiding the harm caused by the continued runaway of the lithium-ion battery. Furthermore, the device body 1 can also perform safety treatment on the runaway lithium-ion battery according to its set test level to prevent or reduce the risk of explosion.

[0032] Second implementation method: Please see Figure 11 and Figure 12 This embodiment is an improvement on the first embodiment. As an optional functional application, the lithium-ion battery thermal runaway testing device based on an array temperature sensor has a graphite elastic hinge 51 fixedly connected to the inner end of the inner heat-conducting plate 32. An extension guide plate 5 is fixedly connected to the inner end of the graphite elastic hinge 51. Multiple adapter clips 42 located on the outer side of the graphite elastic hinge 51 are fixedly connected to the end of the extension guide plate 5 near the heat-conducting plate 32. The adapter clips 42 are located on the upper and lower sides of the graphite elastic hinge 51. A spacing adjustment screw 4 is rotatably connected to the end of the adapter clip 42 near the heat-conducting plate 32. The end of the spacing adjustment screw 4 near the heat-conducting plate 32 passes through the heat-conducting plate 32 and extends into the insulation shell 31. The inner wall of the end of the heat-conducting plate 32 near the inner side is fixed. The device is equipped with multiple threaded sleeves 41 at positions corresponding to the spacing adjustment screw 4, and the threaded sleeves 41 are threaded onto the outside of the spacing adjustment screw 4. The setting of the graphite elastic hinge 51 and the extension guide plate 5 significantly enhances the sensitivity of lithium-ion battery thermal runaway monitoring. With the efficient heat conduction mechanism of direct contact, the heat transfer efficiency is effectively improved, providing strong support for accurately tracking the source of thermal runaway, thereby greatly improving the accuracy of test data. At the same time, the setting of the spacing adjustment screw 4 and the threaded sleeves 41 enables precise control of the extension length of the extension guide plate 5, which not only expands the adaptability of contact temperature sensing, making it flexibly adaptable to lithium-ion batteries of different specifications, but also significantly improves the adaptability and economy of the device body 1 to different test scenarios.

[0033] Please see Figure 12 The graphite elastic hinge 51 is made of multiple graphite strips hinged together. By changing the hinge angle between the multiple graphite strips, the extension guide 5 can be driven to produce a corresponding displacement. The graphite elastic hinge 51 can efficiently ensure heat conduction efficiency and ensure that the contact temperature sensing function is fully utilized. It adopts a hinged connection method and has flexible position adjustment capability, which can be adapted to lithium-ion batteries of different specifications, thereby effectively meeting diverse application needs.

[0034] Please see Figure 11 and Figure 12 After the tester places the lithium-ion battery inside the protective cage 2, the tester adjusts the extension guide 5, which is not in contact with the wall of the lithium-ion battery, according to the placement position of the lithium-ion battery. To save the tester's adjustment steps, the lithium-ion battery can be placed close to the inner wall of the protective cage 2, or the extension guide 5 in the position blocked by the lithium-ion battery can be pre-adjusted.

[0035] When adjusting the position of the extension guide 5, the tester controls it by rotating the pitch adjustment screw 4. When the pitch adjustment screw 4 rotates in the forward direction, it will be continuously screwed into the heat insulation shell 31 through the thread engagement with the threaded sleeve 41. Due to the rotational connection between the pitch adjustment screw 4 and the adapter 42, the extension guide 5 can be driven to move synchronously without rotating it, so that the extension guide 5 moves closer to the heat conduction plate 32, and the graphite elastic hinge 51 changes its hinge angle synchronously. When the spacing adjustment screw 4 rotates in the reverse direction, it will be continuously screwed out of the heat insulation shell 31 through thread engagement with the threaded sleeve 41. Due to the rotational connection between the spacing adjustment screw 4 and the adapter 42, the extension guide 5 can be moved synchronously without rotating it. This causes the extension guide 5 to move away from the heat-conducting plate 32, and the graphite elastic hinge 51 changes its hinge angle synchronously. The spacing adjustment screw 4 stops rotating after the extension guide 5 moves to abut against the end face of the lithium-ion battery. In subsequent tests, the heat inside the lithium-ion battery can be directly conducted to the heat-conducting plate 32 through the extension guide 5 and the graphite elastic hinge 51, effectively improving the heat transfer efficiency.

[0036] The above description is merely a preferred embodiment of the present invention; it encompasses all the protection scope of the present invention. Any equivalent substitutions or modifications made by those skilled in the art within the technical scope disclosed in the present invention, based on the technical solutions and improved concepts of the present invention, should be covered within the protection scope of the present invention.

Claims

1. A lithium-ion battery thermal runaway testing device based on an array temperature sensor, comprising a device body (1), wherein the device body (1) is provided with a control panel (12), a test chamber (11) and a temperature control chamber (13) from top to bottom, and a protective cage (2) is installed inside the test chamber (11), characterized in that: Multiple array temperature sensing components (3) are uniformly installed on the protective cage (2). The array temperature sensing components (3) include a heat insulation shell (31) embedded in the protective cage (2). Both the inner and outer ends of the heat insulation shell (31) are fixedly connected to heat-conducting plates (32). Both ends of the two heat-conducting plates (32) are fixedly connected to multiple heat-driving components (33). An isolation slider (35) is slidably arranged inside the heat insulation shell (31). Both ends of the heat-driving components (33) on the inner and outer sides extend into the heat insulation shell (31) and cooperate with the isolation slider (35). Both the upper and lower inner walls of the heat insulation shell (31) are provided with a pair of balance sensing elements (36), and the isolation slider (35) is located between the two balance sensing elements (36). The control panel (12) is equipped with a temperature auxiliary monitoring system, which includes a temperature auxiliary processing unit. The input end of the temperature auxiliary processing unit is connected to a temperature balance acquisition unit and a temperature data acquisition unit. The output end of the temperature auxiliary processing unit is connected to a temperature feedback unit. The input end of the temperature balance acquisition unit is connected to the balance sensor (36). The input end of the temperature data acquisition unit is connected to the infrared temperature probe installed on the inner wall of the test chamber (11). The output end of the temperature feedback unit is connected to the temperature control chamber (13).

2. The lithium-ion battery thermal runaway testing device based on an array temperature sensor according to claim 1, characterized in that: A synchronization plate (34) is fixedly connected to the end of one of the multiple thermal drive components (33) located on the same side away from the heat conduction plate (32), and the end of the synchronization plate (34) away from the thermal drive component (33) is fixedly connected to the isolation slider (35).

3. The lithium-ion battery thermal runaway testing device based on an array temperature sensor according to claim 2, characterized in that: The thermal drive component (33) includes a corrugated guide tube (331) fixedly disposed between the heat insulation shell (31) and the synchronization plate (34), and an elastic sleeve (332) is fixedly connected inside the corrugated guide tube (331), and the elastic sleeve (332) is filled with a thermosensitive gas (333).

4. The lithium-ion battery thermal runaway testing device based on an array temperature sensor according to claim 2, characterized in that: The balance sensing element (36) includes a linkage block (362) fixedly disposed at the upper and lower ends of the synchronization plate (34), and the linkage block (362) is fixedly connected to the isolation slider (35). An isolation sleeve (363) is fixedly connected to the end of the linkage block (362) away from the isolation slider (35). A limit block (361) is fixedly connected to the end of the isolation sleeve (363) away from the isolation slider (35), and the limit block (361) is fixedly connected to the inner wall of the heat insulation shell (31). A sensing strip (364) is fixedly connected to both the inner wall of the isolation sleeve (363) away from the isolation slider (35) and the inner wall of the isolation sleeve (363) close to the isolation slider (35). The input end of the temperature sensing balance acquisition unit is signal connected to the sensing strip (364).

5. The lithium-ion battery thermal runaway testing device based on an array temperature sensor according to claim 4, characterized in that: The temperature-sensing balance acquisition unit includes an inner-end sensing acquisition module, an outer-end sensing acquisition module, and a sensing positioning and identification module. The input end of the inner-end sensing acquisition module is connected to the sensing strip (364) located inside the isolation slider (35). The input end of the outer-end sensing acquisition module is connected to the sensing strip (364) located outside the isolation slider (35). The input end of the sensing positioning and identification module is connected to the locator embedded in the isolation slider (35).

6. The lithium-ion battery thermal runaway testing device based on an array temperature sensor according to claim 1, characterized in that: A graphite elastic hinge (51) is fixedly connected to the inner end of the heat-conducting plate (32) located on the inner side. An extension guide plate (5) is fixedly connected to the inner end of the graphite elastic hinge (51). A plurality of adapter clips (42) located on the outer side of the graphite elastic hinge (51) are fixedly connected to the end of the extension guide plate (5) near the heat-conducting plate (32). A spacing adjustment screw (4) is rotatably connected to the end of the adapter clip (42) near the heat-conducting plate (32). The end of the spacing adjustment screw (4) near the heat-conducting plate (32) passes through the heat-conducting plate (32) and extends into the insulation shell (31). A plurality of threaded sleeves (41) corresponding to the spacing adjustment screw (4) are fixedly connected to the inner wall of the heat-conducting plate (32) near the inner side of the heat-conducting plate (32). The threaded sleeves (41) are threadedly fitted on the outer side of the spacing adjustment screw (4).

7. A lithium-ion battery thermal runaway testing device based on an array temperature sensor according to claim 6, characterized in that: The graphite elastic hinge (51) is made of multiple graphite strips that are hinged together. By changing the hinge angle between the multiple graphite strips, the extension guide (5) can be driven to produce a corresponding displacement.

8. The lithium-ion battery thermal runaway testing device based on an array temperature sensor according to claim 1, characterized in that: The input end of the temperature auxiliary processing unit is also connected to a parameter setting unit. The input end of the parameter setting unit is connected to the control panel (12) via signal. The output end of the temperature auxiliary processing unit is also connected to a temperature sensing display unit and an abnormality warning unit. The output end of the temperature sensing display unit is connected to the control panel (12) via signal. The output end of the abnormality warning unit is connected to the alarm signal set on the control panel (12).

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