A device for characterizing the thermal puncture behavior of a diaphragm

Abstract

This utility model discloses a device for characterizing the thermal puncture behavior of a separator, relating to the field of lithium battery testing technology. The device includes a chassis, a heating component, a clamping component, and a penetration component. The heating component is provided on the chassis for heating the separator at high temperature. The clamping component is provided inside the heating component for fixing the soft membrane. The penetration component is provided on the heating component for puncturing the soft membrane. An iron plate is provided on the chassis and is fixedly connected to the chassis. The iron plate is electrically connected to an external power source.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery testing technology, specifically a device for characterizing the thermal puncture behavior of a separator. Background Technology

[0002] In recent years, the safety (thermal runaway) of power batteries has become a major obstacle to the rapid promotion of new energy vehicles. Under abusive conditions, the internal temperature of lithium batteries rises, causing the SEI layer to decompose and release heat, which accelerates the heating process. This vicious cycle leads to the softening of the separator. The softened separator is pierced by protrusions on the surface of the electrodes (such as lithium dendrites on the negative electrode), causing the positive and negative electrodes to come into contact with each other, which is called an internal short circuit. The internal short circuit causes the current inside the battery to increase sharply, generating a large amount of Joule heat instantly. The battery temperature rises rapidly in a very short time, exceeding the ignition point of the electrolyte, thus causing the battery to catch fire and explode. It can be seen that the thermal puncture performance of the separator in high-temperature environments has a great impact on the safety performance of power batteries.

[0003] However, the current separator industry uses universal tensile testing machines to test the puncture strength of separators at room temperature. But a separator with high puncture strength at room temperature may not necessarily have high puncture strength at high temperature, and vice versa. The high-temperature puncture strength of the separator is the direct factor that determines the safety of the power battery. However, there is currently no instrument in the industry that specifically characterizes the thermal puncture behavior of separators. Summary of the Invention

[0004] The purpose of this invention is to provide a device for characterizing the thermal puncture behavior of a diaphragm, so as to solve the problems raised in the prior art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] An apparatus for characterizing the thermal puncture behavior of a separator is provided. The apparatus is used to test the puncture resistance of a lithium battery separator under high temperature conditions. The apparatus includes a chassis, a heating component, a clamping component, and a penetration component. The heating component is provided on the chassis for heating the separator at high temperature. The clamping component is provided inside the heating component for fixing the soft membrane. The penetration component is provided on the heating component for puncturing the soft membrane. An iron plate is provided on the chassis and is fixedly connected to the chassis. The iron plate is electrically connected to an external power source.

[0007] The device is mainly used to test the puncture resistance of the soft film on lithium batteries at high temperatures. The heating component heats the soft film to the required temperature. The clamping component fixes the soft film and also tests its tension. The penetration component punctures the soft film. The iron plate is powered by an external power source. When the puncture needle in the penetration component passes through the soft film, it comes into contact with the iron plate. When they come into contact, the puncture needle forms a circuit and becomes energized. The warning light on the connector indicates that the soft film has been penetrated and that the puncture needle is in contact with the chassis, thus controlling the drive push rod to stop working and preventing damage to the puncture needle.

[0008] Furthermore, the heating assembly includes a housing, a heating element, and a cover. The housing is fixedly connected to the upper surface of the chassis, the heating element is located inside the housing, the fixed end of the heating element is fixedly connected to the inner wall of the housing, the cover is rotatably connected to the housing, and a through hole is provided on the cover.

[0009] The housing, cover, and chassis form a sealed space to improve heating efficiency. The heating element is located inside the housing. When the cover is closed, it is used to heat the soft membrane inside the housing. When it needs to be placed or removed, the cover is opened. The cover is made of transparent material, allowing staff to observe the working status inside the housing through the cover. The through hole is for the puncture needle to pass through.

[0010] Furthermore, the clamping assembly includes a slider, a column A, and a roller. A groove is provided on the upper surface of the chassis, and the slider is slidably connected to the groove. The column A is located at the top of the slider and is fixedly connected to the slider. A groove is provided on one side of the column A, and the roller is located in the groove. The fixed end of the roller is fixedly connected to the inner wall of the groove. There are two rollers, and a gear is provided on one side of the roller. The gear teeth mesh with each other. A drive motor is provided on one side of the housing. The fixed end of the drive motor is fixedly connected to the housing, and the output end of the drive motor is connected to the rotating end of the roller.

[0011] The column A is the main structure of the clamping assembly. The groove is used to place the rollers. There are two rollers in one groove, and the two rollers are perpendicular to the horizontal line. The rollers are equipped with gears. When one roller rotates, it will drive the other roller to rotate through the gear. The two rollers rotate in opposite directions, thereby controlling the movement of one end of the soft film. The drive motor is used as the power end to control the rotation of the rollers. Then, in the through-process, the soft film is subjected to extrusion force, which will generate tension at both ends of the soft film. The tension will control the movement of the column A, and the column A drives the slider to move.

[0012] Furthermore, a spring A is provided on one side of the inner wall of the slide groove. One end of the spring A is fixedly connected to the inner wall of the slide groove, and the other end of the spring A is fixedly connected to the slider. A slave plate is provided on the inner wall of the slide groove, and a master plate is provided on the slider. The master plate is located on the side of the slider that is close to the slave plate.

[0013] When the slider moves, it causes one end of spring A to move relative to the main plate. As the main plate moves, the distance between it and the secondary plate changes, thus changing the capacitance. The greater the distance, the smaller the capacitance; conversely, the smaller the distance, the larger the capacitance. Based on the change in capacitance between the main and secondary plates, the distance the slider moves is determined, which is also the elongation of spring A. The tension of the membrane is then calculated based on this elongation, using Hooke's theorem: the elongation of spring A is directly proportional to the applied force, i.e., F = kx, where F represents the applied force, x represents the elongation of spring A, and k is the elastic coefficient of spring A. By measuring the deformation of the elastic element, the magnitude of the tension on the object can be indirectly measured. The rotation angle of the roller is then adjusted based on the detected tension, allowing for comparative experiments with different tension values.

[0014] Furthermore, the through-hole assembly includes a column B and a puncture needle. The column B is fixedly connected to the upper surface of the chassis. A top plate is provided at the top of the column B, and the column B is fixedly connected to the top plate. A drive push rod is provided at the bottom of the top plate. The fixed end of the drive push rod is fixedly connected to the bottom end of the top plate. A connector is provided at the output end of the drive push rod, and the connector is fixedly connected to the output end of the drive push rod. The puncture needle is located at the bottom end of the connector and mates with the through hole.

[0015] Column B is the main structure of the through-assembly, perpendicular to the chassis, with the top plate parallel to the horizontal line. The drive push rod serves as the power end to push the connector downward, which in turn drives the puncture needle downward. The drive push rod is perpendicular to the top plate, and its output end moves downward. The connector is used to install the puncture needle, which is the same size as the through hole, allowing it to enter the housing through the through hole. The puncture needle is made of an electrically conductive material.

[0016] Furthermore, the connector is provided with a spring B, one end of which is fixedly connected to the connector and the other end of which is fixedly connected to the puncture needle. A strain gauge is provided inside the spring B and is fixedly connected to the connector. A squeezing post is provided at one end of the puncture needle and is located at the end of the puncture needle close to the squeezing post. The squeezing post is in contact with the strain gauge.

[0017] During the penetration process, the puncture needle contacts the diaphragm and applies a penetration force. If the diaphragm is not penetrated, it applies a counter-force to the puncture needle, causing the spring B to compress the needle. When the spring B retracts, the compression column contacts the strain gauge, and the compression column compresses the strain gauge. Based on the strain principle, when a conductor or semiconductor material deforms, its resistance value changes. The greater the strain, the greater the change in resistance. The applied penetration force can be determined based on the changed resistance value.

[0018] Furthermore, a warning light is provided on the connector. The warning light is electrically connected to the puncture needle. When the puncture needle contacts the iron plate, a circuit is formed, which powers the warning light.

[0019] Once the puncture needle penetrates the diaphragm, it will come into contact with the iron plate, thus forming a circuit that powers the warning light. Ultimately, the power-on warning light will activate and drive the push rod to stop working.

[0020] Furthermore, a control terminal is provided on the casing, and a control panel is provided inside the control terminal.

[0021] The control terminal is equipped with a control panel. The control terminal is electrically connected to the strain gauge and the main electrode plate. The data measured by both will be displayed on the control terminal. The drive motor and drive push rod are also electrically connected to the control terminal and are controlled by the control terminal. The warning light is also electrically connected to the control terminal. When the warning light is on, the control terminal controls the drive push rod to stop working.

[0022] Compared with the prior art, the beneficial effects of this utility model are:

[0023] 1. This utility model controls the drive motor to work through the control terminal. The drive motor drives the roller to rotate, and then the gears on the roller mesh with each other to rotate, stretching the soft membrane and increasing its surface tension. Because the soft membrane is stretched, the soft membrane itself will exert a pulling force on the column A. The slider on the column A will stretch the spring A. According to the change in capacitance between the main plate and the slave plate, the moving distance of the slider is known, which is also the elongation value of the spring A. Then, the tension value of the soft membrane is calculated based on the elongation value.

[0024] 2. When this utility model is used for penetration, the puncture needle will contact the soft membrane and apply a penetration force to the soft membrane. When the soft membrane is not penetrated, the soft membrane will apply a counter-pushing force to the puncture needle, and the puncture needle will be squeezed by spring B. Spring B will retract, so that the squeezing column will contact the strain gauge, and the squeezing column will squeeze the strain gauge. The greater the strain, the greater the change in resistance. The applied penetration force can be known from the change in resistance value. In addition, the surface tension of the soft membrane will also change during the penetration process. The change in tension value can be known from the change in the distance of spring A.

[0025] 3. After the puncture needle of this utility model penetrates the soft membrane, the puncture needle will come into contact with the iron plate on the chassis. Since the iron plate is energized, the puncture needle will also be energized when it comes into contact with the iron plate. The connecting parts connected to the puncture needle will also be energized, and finally the warning light will be energized and the push rod will stop working. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0027] Figure 2 This is a schematic diagram of the chassis structure of this utility model;

[0028] Figure 3This is a schematic diagram of the through-hole component of this utility model;

[0029] Figure 4 This is a schematic diagram of the slide groove of this utility model;

[0030] Figure 5 This is a schematic diagram of the structure of column A of this utility model;

[0031] Figure 6 This is a schematic diagram of the structure of the drive push rod of this utility model;

[0032] Figure 7 This is a structural schematic diagram of the connector of this utility model.

[0033] In the diagram: 1. Chassis; 11. Slide groove; 2. Heating assembly; 21. Housing; 22. Heating element; 23. Cover; 231. Through hole; 3. Clamping assembly; 31. Slider; 32. Column A; 321. Groove; 33. Roller; 34. Gear; 35. Drive motor; 36. Spring A; 37. Secondary electrode plate; 38. Main electrode plate; 4. Penetration assembly; 41. Column B; 42. Puncture needle; 43. Top plate; 44. Drive push rod; 45. Connector; 46. Spring B; 47. Strain gauge; 48. Extrusion column; 5. Iron plate; 6. Warning light; 7. Control terminal. Detailed Implementation

[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0035] Example: Figures 1-7 As shown, this utility model provides a device for characterizing the thermal puncture behavior of a diaphragm.

[0036] An apparatus for characterizing the thermal puncture behavior of a separator, the apparatus is used to detect the puncture resistance of a lithium battery separator under high temperature conditions, the apparatus includes a chassis 1, a heating component 2, a clamping component 3 and a penetration component 4, the heating component 2 is provided on the chassis 1 for heating the separator at high temperature, the clamping component 3 is provided inside the heating component 2 for fixing the soft membrane, the penetration component 4 is provided on the heating component 2 for puncturing the soft membrane, and an iron plate 5 is provided on the chassis 1, the iron plate 5 is fixedly connected to the chassis 1, and the iron plate 5 is electrically connected to an external power source;

[0037] Specifically, the device is mainly used to test the puncture resistance of the soft film on the lithium battery at high temperatures. The heating component 2 is used to heat the internal soft film to reach the required temperature. The clamping component 3 is used to fix the soft film and also to test the tension of the soft film. The penetrating component 4 is used to perform the puncture process on the soft film. The iron plate 5 is energized by an external power source. When the puncture needle 42 in the penetrating component 4 passes through the soft film, it will come into contact with the iron plate 5. When the two come into contact, the puncture needle 42 will also form a circuit and be energized. The warning light 6 on the connector 45 indicates that the soft film is in a penetrating state and that the puncture needle 42 is in contact with the chassis 1, thereby controlling the drive push rod 44 to stop working to prevent damage to the puncture needle 42.

[0038] like Figure 1 , Figure 3 As shown, the heating assembly 2 includes a housing 21, a heating element 22 and a cover 23. The housing 21 is fixedly connected to the upper surface of the chassis 1. The heating element 22 is located inside the housing 21. The fixed end of the heating element 22 is fixedly connected to the inner wall of the housing 21. The cover 23 is rotatably connected to the housing 21. A through hole 231 is provided on the cover 23.

[0039] Specifically, the housing 21, the cover 23, and the chassis 1 form a sealed space to improve heating efficiency. The heating element 22 is located inside the housing 21. When the cover 23 is closed, it is used to heat the soft membrane inside the housing 21. When it is necessary to place or remove the device, the cover 23 is opened. The cover 23 is made of transparent material, and the staff can observe the working status inside the housing 21 through the cover 23. The through hole 231 is used for the puncture needle 42 to pass through.

[0040] like Figures 2-5 The clamping assembly 3 shown includes a slider 31, a column A32, and a roller 33. A groove 11 is provided on the upper surface of the chassis 1. The slider 31 is slidably connected to the groove 11. The column A32 is located at the top of the slider 31 and is fixedly connected to the slider 31. A groove 321 is provided on one side of the column A32. The roller 33 is located in the groove 321. The fixed end of the roller 33 is fixedly connected to the inner wall of the groove 321. There are two rollers 33. A gear 34 is provided on one side of the roller 33. The teeth of the gears 34 mesh with each other. A drive motor 35 is provided on one side of the housing 21. The fixed end of the drive motor 35 is fixedly connected to the housing 21. The output end of the drive motor 35 is connected to the rotating end of the roller 33.

[0041] Specifically, the column A32 is the main structure of the clamping assembly 3. The groove 321 is used to place the rollers 33. Two rollers 33 are provided in one groove 321, and the two rollers 33 are perpendicular to the horizontal line. The rollers 33 are provided with gears 34. When one roller 33 rotates, it will drive the other roller 33 to rotate through the gear 34. The two rollers 33 rotate in opposite directions, thereby controlling the movement of one end of the soft film. The drive motor 35 is used as the power end to control the rotation of the rollers 33. Then, in the through-process, the soft film is subjected to extrusion pressure, so that the two ends of the soft film will generate tension. The tension will control the column A32 to move, and the column A32 drives the slider 31 to move.

[0042] like Figure 2 , Figure 4 As shown, a spring A36 is provided on one side of the inner wall of the slide groove 11. One end of the spring A36 is fixedly connected to the inner wall of the slide groove 11, and the other end of the spring A36 is fixedly connected to the slider 31. A slave plate 37 is provided on the inner wall of the slide groove 11, and a master plate 38 is provided on the slider 31. The master plate 38 is located on the side of the slider 31 that is close to the slave plate 37.

[0043] Specifically, when slider 31 moves, it causes one end of spring A36 to move relative to the main plate 38. As the main plate 38 moves, the distance between it and the secondary plate 37 changes, resulting in a change in capacitance. The greater the distance, the smaller the capacitance; conversely, the smaller the distance, the larger the capacitance. Based on the change in capacitance between the main plate 38 and the secondary plate 37, the distance slider 31 moves is determined, which is also the elongation of spring A36. The tension of the membrane is then calculated based on this elongation, using Hooke's theorem: the elongation of spring A36 is proportional to the applied force, i.e., F=kx, where F represents the applied force, x represents the elongation of spring A36, and k is the elastic coefficient of spring A36. By measuring the deformation of the elastic element, the magnitude of the tension on the object can be indirectly measured. The rotation angle of roller 33 is then adjusted based on the detected tension, allowing for a comparative experiment of different tension values.

[0044] like Figure 1 , Figure 3 , Figure 6 As shown, the through-hole assembly 4 includes a column B41 and a puncture needle 42. The column B41 is fixedly connected to the upper surface of the chassis 1. The top of the column B41 is provided with a top plate 43, and the column B41 is fixedly connected to the top plate 43. The bottom of the top plate 43 is provided with a drive push rod 44. The fixed end of the drive push rod 44 is fixedly connected to the bottom end of the top plate 43. The output end of the drive push rod 44 is provided with a connector 45, and the connector 45 is fixedly connected to the output end of the drive push rod 44. The puncture needle 42 is located at the bottom end of the connector 45 and cooperates with the through hole 231.

[0045] Specifically, column B41 is the main structure of the through component 4, perpendicular to the chassis 1, and top plate 43 is parallel to the horizontal line. Drive push rod 44 is used as the power end to push connector 45 to move downward. Connector 45 drives puncture needle 42 to move downward. Drive push rod 44 is perpendicular to top plate 43, and the output end of drive push rod 44 moves downward. Connector 45 is used to install puncture needle 42. The overall size of puncture needle 42 is the same as that of through hole 231, so puncture needle 42 enters housing 21 through through hole 231. Puncture needle 42 is made of electrically conductive material.

[0046] like Figure 7 As shown, a spring B46 is provided on the connector 45. One end of the spring B46 is fixedly connected to the connector 45, and the other end of the spring B46 is fixedly connected to the puncture needle 42. A strain gauge 47 is provided inside the spring B46. The strain gauge 47 is fixedly connected to the connector 45. A compression post 48 is provided at one end of the puncture needle 42. The compression post 48 is located at the end of the puncture needle 42 close to the compression post 48. The compression post 48 is in contact with the strain gauge 47.

[0047] Specifically, during the penetration process, the puncture needle 42 contacts the soft membrane and applies a penetration force to it. If the soft membrane is not penetrated, it applies a counter-pushing force to the puncture needle 42, which is then compressed by the spring B46. The spring B46 retracts, causing the compression column 48 to contact the strain gauge 47. The compression column 48 then compresses the strain gauge 47. Based on the strain principle, when a conductor or semiconductor material deforms, its resistance value changes. The greater the strain, the greater the change in resistance. The applied penetration force can be determined based on the changed resistance value.

[0048] like Figure 7 The connector 45 shown is equipped with a warning light 6, which is electrically connected to the puncture needle 42. The puncture needle 42 and the iron plate 5 form a circuit to energize the warning light 6.

[0049] Specifically, after the puncture needle 42 penetrates the diaphragm, the puncture needle 42 will come into contact with the iron plate 5, thus forming a circuit between the puncture needle 42 and the iron plate 5 to energize the warning light 6. Finally, the warning light 6 is energized and works, driving the push rod 44 to stop working.

[0050] like Figure 1 The housing 21 shown is equipped with a control terminal 7, and the control terminal 7 contains a control panel;

[0051] Specifically, the control terminal 7 is equipped with a control panel. The control terminal 7 is electrically connected to the strain gauge 47 and the main electrode plate 38. The data measured by both will be displayed on the control terminal 7. The drive motor 35 and the drive push rod 44 are also electrically connected to the control terminal 7 and are controlled by the control terminal 7. Then, the warning light 6 is also electrically connected to the control terminal 7. When the warning light 6 is working, the control terminal 7 controls the drive push rod 44 to stop working.

[0052] Working principle: The operator first opens the cover 23, then places both ends of the soft membrane onto the rollers 33, and finally closes the cover 23. The control terminal 7 controls the drive motor 35 to operate, causing the rollers 33 to rotate. The gears 34 on the rollers 33 mesh and rotate, stretching the soft membrane and increasing its surface tension. The heating element 22 is then controlled to heat it at a high temperature. Simultaneously, due to the stretching of the soft membrane, it exerts a pulling force on the column A32. The slider 31 on the column A32 stretches the spring A36. Based on the change in capacitance between the main plate 38 and the secondary plate 37, the movement distance of the slider 31 is determined, which is also the elongation of the spring A36. The tension value of the soft membrane is then calculated based on the elongation value, driving the push... When rod 44 operates, it pushes puncture needle 42, which enters housing 21 through through hole 231 and contacts the soft membrane. The drive rod 44 continues to operate, maintaining a certain thrust, so that puncture needle 42 punctures the soft membrane. As heating element 22 operates, the temperature inside housing 21 continues to rise, and the soft membrane gradually softens. During the puncture process, the counter-thrust of puncture needle 42 causes extrusion column 48 to exert force on strain gauge 47. After puncture needle 42 penetrates the soft membrane, it comes into contact with iron plate 5 on chassis 1. Since iron plate 5 is energized, puncture needle 42 also comes into contact with iron plate 5 and is energized. Connector 45 connected to puncture needle 42 is also energized. Finally, warning light 6 is energized and the drive rod 44 stops operating.

[0053] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. An apparatus for characterizing the hot puncture behavior of a separator, the apparatus for detecting the puncture resistance of a lithium battery separator under high temperature conditions, characterized in that: The device includes a chassis (1), a heating component (2), a clamping component (3), and a penetration component (4). The chassis (1) is provided with a heating component (2), which is used to heat the diaphragm at high temperature. The heating component (2) is provided with a clamping component (3), which is used to fix the soft membrane. The heating component (2) is provided with a penetration component (4), which is used to puncture the soft membrane. The chassis (1) is provided with an iron plate (5), which is fixedly connected to the chassis (1) and electrically connected to an external power source.

2. A device for characterizing the heat piercing behavior of a separator according to claim 1, characterized in that: The heating assembly (2) includes a housing (21), a heating element (22) and a cover (23). The housing (21) is fixedly connected to the upper surface of the chassis (1). The heating element (22) is located inside the housing (21). The fixed end of the heating element (22) is fixedly connected to the inner wall of the housing (21). The cover (23) is rotatably connected to the housing (21). A through hole (231) is provided on the cover (23).

3. A device for characterizing the heat piercing behavior of a separator according to claim 2, characterized in that: The clamping assembly (3) includes a slider (31), a column A (32) and a roller (33). A groove (11) is provided on the upper surface of the chassis (1). The slider (31) is slidably connected to the groove (11). The column A (32) is located at the top of the slider (31). The column A (32) is fixedly connected to the slider (31). A groove (321) is provided on one side of the column A (32). The roller (33) is located in the groove (321). The fixed end of the roller (33) is fixedly connected to the inner wall of the groove (321). There are two rollers (33). A gear (34) is provided on one side of the roller (33). The gears (34) mesh with each other. A drive motor (35) is provided on one side of the housing (21). The fixed end of the drive motor (35) is fixedly connected to the housing (21). The output end of the drive motor (35) is connected to the rotating end of the roller (33).

4. A device for characterizing the heat piercing behavior of a separator according to claim 3, characterized in that: A spring A (36) is provided on one side of the inner wall of the slide groove (11). One end of the spring A (36) is fixedly connected to the inner wall of the slide groove (11), and the other end of the spring A (36) is fixedly connected to the slider (31). A slave plate (37) is provided on the inner wall of the slide groove (11), and a master plate (38) is provided on the slider (31). The master plate (38) is located on the side of the slider (31) close to the slave plate (37).

5. The device for characterizing the thermal puncture behavior of a diaphragm according to claim 4, characterized in that: The through-hole assembly (4) includes a column B (41) and a puncture needle (42). The column B (41) is fixedly connected to the upper surface of the chassis (1). The top of the column B (41) is provided with a top plate (43). The column B (41) is fixedly connected to the top plate (43). The bottom of the top plate (43) is provided with a drive push rod (44). The fixed end of the drive push rod (44) is fixedly connected to the bottom end of the top plate (43). The output end of the drive push rod (44) is provided with a connector (45). The connector (45) is fixedly connected to the output end of the drive push rod (44). The puncture needle (42) is located at the bottom end of the connector (45). The puncture needle (42) cooperates with the through hole (231).

6. The device for characterizing the thermal puncture behavior of a diaphragm according to claim 5, characterized in that: The connector (45) is provided with a spring B (46), one end of the spring B (46) is fixedly connected to the connector (45), and the other end of the spring B (46) is fixedly connected to the puncture needle (42). A strain gauge (47) is provided inside the spring B (46), and the strain gauge (47) is fixedly connected to the connector (45). One end of the puncture needle (42) is provided with a compression column (48), and the compression column (48) is located at the end of the puncture needle (42) close to the compression column (48). The compression column (48) is in contact with the strain gauge (47).

7. The device for characterizing the thermal puncture behavior of a diaphragm according to claim 6, characterized in that: The connector (45) is provided with a warning light (6), which is electrically connected to the puncture needle (42). The puncture needle (42) contacts the iron plate (5) to form a circuit, which powers the warning light (6).

8. The device for characterizing the thermal puncture behavior of a diaphragm according to claim 7, characterized in that: The housing (21) is provided with a control terminal (7), and the control terminal (7) is provided with a control panel.

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