Device for testing thermal shrinkage rate of battery diaphragm

Abstract

The utility model relates to the technical field of diaphragm testing, in particular to a device for testing the thermal shrinkage rate of a battery diaphragm. The battery diaphragm thermal shrinkage rate testing device comprises a heating box, a clamping assembly, a driving assembly and a displacement detection assembly, the heating box is used for providing a heating environment for a tested diaphragm, the clamping assembly is arranged in the heating box, and the clamping assembly comprises a fixed clamping piece and a movable clamping piece; the fixed clamping piece and the movable clamping piece are arranged at intervals in the length direction of the test diaphragm, the fixed clamping piece fixes the first end of the test diaphragm, the movable clamping piece fixes the second end of the test diaphragm, the driving assembly is connected with the movable clamping piece, and the driving assembly is used for driving the movable clamping piece to move in the direction close to or away from the fixed clamping piece. And the displacement detection assembly is used for detecting the variable quantity of the length of the tested diaphragm after the tested diaphragm is heated. The device for testing the thermal shrinkage rate of the battery diaphragm can avoid irregular shrinkage of the tested diaphragm and improve the testing accuracy.

Description

Technical Field

[0001] The utility model relates to the technical field of diaphragm testing, in particular to a device for testing the thermal shrinkage rate of a battery diaphragm. Background Art

[0002] The battery diaphragm is one of the important components of a lithium battery. It plays a role in isolating the positive and negative electrodes and preventing internal short circuits in the battery. Among them, the thermal shrinkage rate of the battery diaphragm is an important performance index, which reflects the dimensional stability of the battery diaphragm when heated. By testing the thermal shrinkage rate of the battery diaphragm, it is convenient to evaluate the performance of new materials, optimize the performance of existing materials, and ensure the safe operation of the battery.

[0003] In the existing device for testing the thermal shrinkage rate of a battery diaphragm, a stainless steel plate and two pieces of filter paper are placed in an oven. One piece of filter paper is placed on the stainless steel plate, the test diaphragm is placed on the filter paper on the stainless steel plate, and then the other piece of filter paper is covered on the test diaphragm to uniformly heat the test diaphragm through the stainless steel plate and the filter paper. However, the above device still causes uneven heating of the test diaphragm, making the test diaphragm prone to wrinkling, twisting and deformation during heating, resulting in irregular deformation of the test diaphragm and greatly reducing the accuracy of the test.

[0004] Therefore, there is an urgent need for a device for testing the thermal shrinkage rate of a battery diaphragm to solve the above problems. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a device for testing the thermal shrinkage rate of a battery diaphragm to uniformly heat the test diaphragm, avoid irregular shrinkage of the test diaphragm, and improve the accuracy of the test.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] A device for testing the thermal shrinkage rate of a battery diaphragm includes:

[0008] A heating box, which is used to provide a heating environment for the test diaphragm;

[0009] A clamping assembly, which is arranged in the heating box. The clamping assembly includes a fixed clamping member and a movable clamping member. The fixed clamping member and the movable clamping member are arranged at intervals along the length direction of the test diaphragm. The fixed clamping member fixes the first end of the test diaphragm, and the movable clamping member fixes the second end of the test diaphragm;

[0010] A driving assembly, which is connected to the movable clamping member. The driving assembly is configured to drive the movable clamping member to move towards or away from the fixed clamping member, so that the test diaphragm is always in a natural straight state; and

[0011] A displacement detection component configured to detect the change in length of the test diaphragm after heating.

[0012] As an alternative, the battery separator thermal shrinkage rate testing device further includes:

[0013] A force detection component communicatively connected to the driving component and configured to detect the tensile force value by which the test diaphragm is stretched.

[0014] As an alternative, the force detection component includes:

[0015] A fixing member by which the second end of the test diaphragm is fixed to the movable clamping member; and

[0016] A force detection member disposed outside the heating chamber and connected to the fixing member through a data acquisition line.

[0017] As an alternative, the driving component includes:

[0018] A driving motor disposed outside the heating chamber; and

[0019] A transmission member. The output shaft of the driving motor extends into the heating chamber and is in transmission connection with the transmission member, and the transmission member is in transmission connection with the movable clamping member.

[0020] As an alternative, the battery separator thermal shrinkage rate testing device further includes:

[0021] A guiding component disposed inside the heating chamber and configured to guide the movable clamping member to move in a direction approaching or departing from the fixed clamping member.

[0022] As an alternative, the guiding component includes:

[0023] A guiding column fixedly installed inside the heating chamber. The fixed clamping member is fixedly installed at the top end of the guiding column, and the movable clamping member is movably sleeved on the guiding column.

[0024] As an alternative, the displacement detection component is a displacement sensor disposed on the inner wall of the heating chamber.

[0025] As an alternative, a transparent heat insulation cover is provided outside the circumference of the displacement sensor.

[0026] As an alternative, the fixed clamping member includes:

[0027] A fixing plate, on which a clamping groove is formed for accommodating the first end of the test diaphragm; and

[0028] A fastener, which is threadedly connected to the fixing plate and abuts against the first end of the test diaphragm after screwing through the fixing plate.

[0029] As an alternative, the heating box includes:

[0030] A box body, with an opening on one side of the box body, and the clamping assembly is arranged inside the box body;

[0031] A heating element, arranged inside the box body; and

[0032] A box door, which is movably connected to the box body and is used to block or open the opening.

[0033] Advantages of the present utility model:

[0034] The present utility model provides a battery diaphragm thermal shrinkage rate testing device, which includes a heating box, a clamping assembly, a driving assembly and a displacement detection assembly. The heating box is used to provide a heating environment for the test diaphragm. The clamping assembly is arranged inside the heating box and includes a fixed clamping member and a movable clamping member. The fixed clamping member and the movable clamping member are arranged at intervals along the length direction of the test diaphragm. The fixed clamping member fixes the first end of the test diaphragm, and the movable clamping member fixes the second end of the test diaphragm. The driving assembly is connected to the movable clamping member and is used to drive the movable clamping member to move towards or away from the fixed clamping member, so that the test diaphragm is always in a natural straight state. The displacement detection assembly is used to detect the change amount of the length of the test diaphragm after heating. This battery diaphragm thermal shrinkage rate testing device enables the test diaphragm to be always in a natural straight state during the testing process, and directly heats the test diaphragm in a natural straight state by the hot air in the heating box, which can uniformly heat the test diaphragm and also avoid irregular shrinkage of the test diaphragm, effectively improving the accuracy of the test. Description of the Drawings

[0035] Figure 1 is a schematic structural diagram of the battery diaphragm thermal shrinkage rate testing device provided by an embodiment of the present utility model Figure 1 ;

[0036] Figure 2 is a schematic structural diagram of the battery diaphragm thermal shrinkage rate testing device provided by an embodiment of the present utility model Figure 2 ;

[0037] Figure 3 is a schematic structural diagram of the battery diaphragm thermal shrinkage rate testing device provided by an embodiment of the present utility model Figure 3;

[0038] Figure 4 It is a partial structural schematic diagram of the battery separator thermal shrinkage rate test device provided by the embodiments of the present invention.

[0039] In the figure:

[0040] 10. Battery separator thermal shrinkage rate test device; 20. Test separator;

[0041] 1. Heating box; 11. Box body; 111. Open end; 12. Box door; 13. Mounting plate; 2. Clamping assembly; 21. Fixed clamping member; 211. Fixed plate; 2111. Clamping groove; 212. Fastening member; 22. Movable clamping member; 221. Movable clamping plate; 2211. Accommodation groove; 222. Connecting cross plate; 2221. Avoidance groove; 3. Driving assembly; 31. Driving motor; 32. Transmission member; 4. Force detection assembly; 41. Fixed member; 42. Force detection member; 5. Guide assembly; 51. Guide post; 6. Displacement detection assembly. Detailed implementation manners

[0042] To make the technical problems solved, the technical solutions adopted, and the technical effects achieved by the present invention clearer, the technical solutions of the present invention will be further described below with reference to the accompanying drawings and through specific implementation manners.

[0043] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0044] In the present invention, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "above and over", and "on the top of" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "below and under", and "under the bottom of" the second feature includes the first feature being directly below and obliquely below the second feature, or simply indicating that the horizontal height of the first feature is lower than that of the second feature.

[0045] In the description of this embodiment, the orientation or positional relationships such as "upper", "lower", "left", and "right" are based on the orientation or positional relationships shown in the drawings. These are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and do not have special meanings.

[0046] In the existing device for testing the thermal shrinkage rate of a battery separator, a stainless steel plate and two pieces of filter paper are placed in an oven. One piece of filter paper is placed on the stainless steel plate, the test separator is placed on the filter paper on the stainless steel plate, and then the other piece of filter paper is covered on the test separator to evenly heat the test separator through the stainless steel plate and the filter paper with the heat in the oven. However, the above device still causes uneven heating of the test separator, making it easy for the test separator to wrinkle, twist, and deform during the heating process, resulting in irregular deformation of the test separator and greatly reducing the accuracy of the test.

[0047] To solve the above problems, as Figures 1 to 3 shown, this embodiment provides a device 10 for testing the thermal shrinkage rate of a battery separator. The device 10 for testing the thermal shrinkage rate of a battery separator includes a heating chamber 1, a clamping assembly 2, a driving assembly 3, and a displacement detection assembly 6. Among them, the heating chamber 1 is used to provide a heating environment for the test separator 20. The clamping assembly 2 is arranged in the heating chamber 1. The clamping assembly 2 includes a fixed clamping member 21 and a movable clamping member 22. The fixed clamping member 21 and the movable clamping member 22 are arranged at intervals along the length direction of the test separator 20. The fixed clamping member 21 fixes the first end of the test separator 20, and the movable clamping member 22 fixes the second end of the test separator 20. The driving assembly 3 is connected to the movable clamping member 22. The driving assembly 3 is used to drive the movable clamping member 22 to move in a direction close to or away from the fixed clamping member 21, so that the test separator 20 is always in a natural straight state. The displacement detection assembly 6 is used to detect the change amount of the length of the test separator 20 after heating. The device 10 for testing the thermal shrinkage rate of a battery separator enables the test separator 20 to always be in a natural straight state during the test process, and directly heats the test separator 20 in a natural straight state with the hot air in the heating chamber 1, which can evenly heat the test separator 20 and also avoid irregular shrinkage of the test separator 20, effectively improving the accuracy of the test.

[0048] Optionally, in this embodiment, both the fixed clamping member 21 and the movable clamping member 22 are made of stainless steel. Stainless steel has the advantages of high temperature resistance, high structural strength, and strong reliability. Optionally, in this embodiment, the test separator 20 can be a 5 mm × 30 mm rectangle intercepted, but it is not limited thereto. The length of the test separator 20 can also be 16 mm or 20 mm.

[0049] Optionally, in this embodiment, the output shaft of the driving assembly 3 is in transmission connection with the movable clamping member 22. When testing the test diaphragm 20, first, the clamping assembly 2 is used to clamp and fix the test diaphragm 20. Then, the driving assembly 3 drives the movable clamping member 22 to move away from the fixed clamping member 21 until the test diaphragm 20 is stretched to a natural straight state. At this time, the tensile force value received by the test diaphragm 20 is the preset tensile force value. Then, the heating box 1 is enabled to provide a heating environment for the test diaphragm 20. And during the heating process of the test diaphragm 20, since the test diaphragm 20 will shrink, it is necessary for the driving assembly 3 to drive the movable clamping member 22 to move towards the fixed clamping member 21 to ensure that the tensile force value received by the test diaphragm 20 is always the preset tensile force value, that is, the clamping assembly 2 always keeps the test diaphragm 20 in a natural straight state and avoids overstretching the test diaphragm 20. At the preset tensile force value, the test diaphragm 20 will not deform and can keep the test diaphragm 20 in a natural straight state. Optionally, the preset tensile force value can be 0.01N to 0.05N. In this embodiment, the preset tensile force value is preferably 0.01. The limitation of the above preset tensile force value range can not only avoid the stretching deformation of the test diaphragm 20 but also ensure that the test diaphragm 20 is in a natural straight state. It should be noted that the thermal shrinkage rate of the test diaphragm 20 = the change amount of the length of the test diaphragm 20 after heating / the original length of the test diaphragm 20 × 100%.

[0050] Optionally, in other embodiments, the driving assembly 3 can also be in the form of a counterweight. The driving assembly 3 is connected to the movable clamping member 22, and the driving assembly 3 applies a preset tensile force value to the movable clamping member 22 under the action of its own gravity to ensure that the test diaphragm 20 is always in a natural straight state. When testing the test diaphragm 20, first, the clamping assembly 2 is used to clamp and fix the test diaphragm 20. At this time, under the action of the counterweight, the test diaphragm 20 can be stretched to a natural straight state. At this time, the tensile force value received by the test diaphragm 20 is the preset tensile force value. Then, the heating box 1 is enabled to provide a heating environment for the test diaphragm 20. And during the heating process of the test diaphragm 20, since the test diaphragm 20 will shrink, the contraction force generated by the test diaphragm 20 at this time will pull the movable clamping member 22 and the counterweight to move towards the fixed clamping member 21.

[0051] In this embodiment, as Figures 2 to 4As shown, the battery separator thermal shrinkage rate testing device 10 further includes a force detection component 4. The force detection component 4 is communicatively connected to the driving component 3. The force detection component 4 is used to detect the tensile force value of the test separator 20 being stretched. By detecting the tensile force value of the test separator 20 being stretched through the force detection component 4, the driving component 3 can keep the test separator 20 in a natural straight state according to the detection value of the force detection component 4. Specifically, when the force detection component 4 detects that the tensile force value of the test separator 20 being stretched is less than the preset tensile force value, at this time, the driving component 3 drives the movable clamping member 22 to move away from the fixed clamping member 21 according to the detection value of the force detection component 4 until the tensile force value received by the test separator 20 is the preset tensile force value. When the force detection component 4 detects that the tensile force value of the test separator 20 being stretched is greater than the preset tensile force value, at this time, the driving component 3 drives the movable clamping member 22 to move towards the fixed clamping member 21 according to the detection value of the force detection component 4 until the tensile force value received by the test separator 20 is the preset tensile force value.

[0052] In this embodiment, as Figures 2 to 4 shown, the force detection component 4 includes a fixing member 41 and a force detection member 42. Among them, the second end of the test separator 20 is fixed to the movable clamping member 22 through the fixing member 41. The force detection member 42 is arranged outside the heating box 1, and the force detection member 42 is connected to the fixing member 41 through a data acquisition line. The above setting enables the force detection member 42 to collect the tensile force value of the test separator 20 being stretched through the data acquisition line, which not only realizes the detection of the tensile force value of the test separator 20, but also avoids the force detection member 42 from bearing high temperature in the heating box 1, ensuring the accuracy of the detection by the force detection member 42 and also improving the service life of the force detection member 42. Optionally, in this embodiment, the force detection member 42 can be a force sensor, and the fixing member 41 can be a bolt.

[0053] In this embodiment, as Figure 2 and Figure 4As shown in the figure, the driving assembly 3 includes a driving motor 31 and a transmission member 32. Among them, the driving motor 31 is arranged outside the heating box 1, and the output shaft of the driving motor 31 extends into the heating box 1 and is in transmission connection with the transmission member 32 inside the heating box 1. The transmission member 32 is in transmission connection with the movable clamping member 22. The driving motor 31 drives the movable clamping member 22 to move in a direction close to or away from the fixed clamping member 21 through the transmission member 32. By arranging the driving motor 31 outside the heating box 1, the driving motor 31 is prevented from bearing high temperature inside the heating box 1, ensuring the normal operation of the driving motor 31 and also improving the service life of the driving motor 31. Optionally, in this embodiment, the driving motor 31 can be a servo motor, and the transmission member 32 can be a worm and worm gear transmission member. The transmission member 32 can also be a gear and rack transmission member. The specific form of the transmission member 32 is not limited in this embodiment. Optionally, in this embodiment, the battery separator thermal shrinkage rate testing device 10 includes two driving assemblies 3. The two driving assemblies 3 are arranged at intervals and jointly drive the movable clamping member 22 to move in a direction close to or away from the fixed clamping member 21, making the movement of the movable clamping member 22 more stable and reliable.

[0054] In this embodiment, as Figure 2 and Figure 3 shown, the heating box 1 includes a box body main body 11, a heating member (not shown in the figure), and a box door 12. Among them, an opening 111 is provided on one side of the box body main body 11. A clamping assembly 2, a fixing member 41, and a transmission member 32 are arranged inside the box body main body 11. The heating member is arranged inside the box body main body 11. The box door 12 is movably connected to the box body main body 11, and the box door 12 is used to block or open the opening 111. When it is necessary to install or remove the test diaphragm 20, the box door 12 is opened to open the opening 111. When it is necessary to test the test diaphragm 20, the box door 12 is used to block the opening 111, so that the heating box 1 provides a sealed heating environment. Optionally, the heating member can be an electric heating furnace. Optionally, in this embodiment, the box door 12 is rotatably connected to the box body main body 11. In other embodiments, the box door 12 can also be slidably connected to the box body main body 11. Optionally, in this embodiment, the heating box 1 further includes a mounting plate 13. The mounting plate 13 is fixedly installed on the outer side wall of the box body main body 11, and a force detection member 42 and a driving motor 31 are installed on the mounting plate 13.

[0055] In this embodiment, as Figure 3 shown, the battery separator thermal shrinkage rate testing device 10 further includes a guiding assembly 5. The guiding assembly 5 is arranged inside the box body main body 11, and the guiding assembly 5 is used to guide the movable clamping member 22 to move in a direction close to or away from the fixed clamping member 21, so that the movement of the movable clamping member 22 is more stable and reliable.

[0056] Optionally, in this embodiment, the guiding component 5 includes a guiding column 51. The guiding column 51 is fixedly installed inside the box body 11. A fixed clamping member 21 is fixedly installed at the top end of the guiding column 51, and a movable clamping member 22 is movably penetrated through the guiding column 51. By designing the guiding component 5 in the form of the guiding column 51, the structure is simple and the guiding effect on the movable clamping member 22 is good. Optionally, in this embodiment, the guiding component 5 includes two guiding columns 51 arranged at intervals. The fixed clamping member 21 is jointly installed at the top ends of the two guiding columns 51, and the movable clamping member 22 is movably sleeved on the two guiding columns 51, further ensuring the stability and reliability of the movement of the movable clamping member 22. Optionally, in other embodiments, the guiding component 5 can also be designed in the form of a sliding rail and a slider connected by sliding.

[0057] In this embodiment, as Figure 3 shown, the displacement detection component 6 is a displacement sensor, and the displacement sensor is arranged on the inner wall of the box body 11. It should be noted that after the test diaphragm 20 is naturally straightened, a heating test is carried out. And when the heating test of the test diaphragm 20 is completed, the displacement amount of the movable clamping member 22 moving towards the fixed clamping member 21 during the heating test is the change amount of the length of the test diaphragm 20 after heating. By using the displacement sensor to detect the change amount of the length of the test diaphragm 20 after heating, the detection is more accurate, further ensuring the accuracy of the test and being more intelligent and convenient. Optionally, in this embodiment, a transparent heat insulation cover is provided outside the displacement sensor, which not only ensures the normal detection of the displacement sensor, but also avoids the displacement sensor from bearing high temperature, ensuring the accuracy of the displacement sensor detection and also improving the service life of the displacement sensor.

[0058] Optionally, in other embodiments, the displacement detection component 6 can also be a detection ruler, and the change amount of the length of the test diaphragm 20 after heating is measured by manually operating the detection ruler.

[0059] In this embodiment, as Figure 4 shown, the fixed clamping member 21 includes a fixing plate 211 and a fastening member 212. Among them, a clamping groove 2111 is formed on the fixing plate 211, and the clamping groove 2111 is used to accommodate the first end of the test diaphragm 20. The fastening member 212 is threadedly connected to the fixing plate 211, and after the fastening member 212 is screwed through the fixing plate 211, it abuts against the first end of the test diaphragm 20. The above structural design of the fixed clamping member 21 not only realizes the fixation of the first end of the test diaphragm 20 on the fixed clamping member 21, but also does not require an installation hole to be opened on the first end of the test diaphragm 20. Optionally, the fastening member 212 can be a bolt. Optionally, in this embodiment, the fixed clamping member 21 includes two fastening members 212 arranged at intervals, and the two fastening members 212 jointly realize the abutting fixation of the test diaphragm 20.

[0060] Optionally, in this embodiment, as Figure 4 shown, the movable clamping member 22 includes a movable clamping plate 221 and a connecting cross plate 222. Among them, a receiving groove 2211 is formed on the movable clamping plate 221. The second end of the test diaphragm 20 is located in the receiving groove 2211. The fixing member 41 passes through the second end of the test diaphragm 20 and is threadedly connected to the bottom wall of the receiving groove 2211. The movable clamping plate 221 is disposed on the connecting cross plate 222, and both ends of the connecting cross plate 222 are respectively in transmission connection with the corresponding transmission members 32. By forming the receiving groove 2211 on the movable clamping plate 221 to receive the second end of the test diaphragm 20, it is ensured that the test diaphragm 20 is in a vertical state, thereby facilitating the detection of the length change amount of the test diaphragm 20. Optionally, in this embodiment, an avoidance groove 2221 is formed on the connecting cross plate 222, and the avoidance groove 2221 is used to avoid the guide post 51, which not only ensures the normal movement of the movable clamping plate 221 but also makes the structure more compact and reasonable.

[0061] It should be noted that, in this embodiment, by adjusting the heating member, the heating box 1 can also provide an environment with linearly variable temperature, so as to perform a linearly variable temperature test on the test diaphragm 20, thereby better realizing the screening of the diaphragm before assembly, achieving the purpose of optimizing the battery design, and avoiding short circuits caused by the shrinkage of the diaphragm due to temperature changes during the use of the battery. For example, in one test scenario, the temperature inside the heating box 1 can be raised to 90 °C and then kept constant for 2 h, and the length change of the test diaphragm 20 is monitored in real time during the test; in another test scenario, the temperature inside the heating box 1 can be raised to 120 °C and then kept constant for 1 h, and the length change of the test diaphragm 20 is monitored in real time during the test; in another test scenario, the temperature inside the heating box 1 can also be heated to 130 °C at a rate of 3 °C / min, and the length change of the test diaphragm 20 is monitored in real time during the test. This embodiment does not make a specific limitation on the heating and temperature measurement forms of the heating box 1.

[0062] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limiting the embodiments of the present invention. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A battery separator thermal shrinkage test device, characterized in that: include: A heating box (1), the heating box (1) being used to provide a heating environment for the test diaphragm (20); A clamping assembly (2) is arranged in the heating box (1), the clamping assembly (2) comprising a fixed clamping member (21) and a movable clamping member (22), the fixed clamping member (21) and the movable clamping member (22) being arranged at intervals along the length direction of the test diaphragm (20), the fixed clamping member (21) fixing the first end of the test diaphragm (20), and the movable clamping member (22) fixing the second end of the test diaphragm (20); a driving assembly (3), the driving assembly (3) being connected to the movable clamping member (22), the driving assembly (3) being configured to drive the movable clamping member (22) to move in a direction approaching or away from the fixed clamping member (21), so that the test diaphragm (20) is always in a naturally straightened state; as well as A displacement detection component (6) is configured to detect a change in length of the test diaphragm (20) after heating.

2. The battery separator thermal shrinkage test device according to claim 1, characterized in that: The battery separator thermal shrinkage test device also includes: A force detection component (4), the force detection component (4) is communicatively connected to the drive component (3), and the force detection component (4) is configured to detect the tension value of the test diaphragm (20) being stretched.

3. The battery separator thermal shrinkage test device according to claim 2, characterized in that: The force detection component (4) comprises: a fixing member (41), wherein the second end of the test diaphragm (20) is fixed to the movable clamping member (22) via the fixing member (41); and The force detection component (42) is arranged outside the heating box (1), and the force detection component (42) is connected to the fixing component (41) via a data acquisition line.

4. The battery separator thermal shrinkage test device according to any one of claims 1 to 3, characterized in that: The driving assembly (3) comprises: A driving motor (31) is arranged outside the heating box (1); and A transmission member (32), wherein the output shaft of the driving motor (31) extends into the heating box (1) and is transmission-connected to the transmission member (32), and the transmission member (32) is transmission-connected to the movable clamping member (22).

5. The battery separator thermal shrinkage test device according to any one of claims 1 to 3, characterized in that: The battery separator thermal shrinkage test device also includes: A guide assembly (5), wherein the guide assembly (5) is disposed in the heating box (1), and the guide assembly (5) is configured to guide the movable clamping member (22) to move toward or away from the fixed clamping member (21).

6. The battery separator thermal shrinkage test device according to claim 5, characterized in that: The guide assembly (5) comprises: A guide column (51), wherein the guide column (51) is fixedly installed in the heating box (1), the fixed clamping piece (21) is fixedly installed on the top end of the guide column (51), and the movable clamping piece (22) is movably inserted into the guide column (51).

7. The battery separator thermal shrinkage test device according to any one of claims 1 to 3, characterized in that: The displacement detection component (6) is a displacement sensor, and the displacement sensor is arranged on the inner wall of the heating box (1).

8. The battery separator thermal shrinkage test device according to claim 7, characterized in that: The outer peripheral cover of the displacement sensor is provided with a transparent heat insulation cover.

9. The battery separator thermal shrinkage test device according to any one of claims 1 to 3, characterized in that: The fixing clamp (21) comprises: a fixing plate (211), wherein the fixing plate (211) is provided with a clamping groove (2111), wherein the clamping groove (2111) is used to accommodate the first end of the test diaphragm (20); and A fastener (212), wherein the fastener (212) is threadedly connected to the fixing plate (211), and after the fastener (212) is screwed through the fixing plate (211), it abuts against the first end of the test diaphragm (20).

10. The battery separator thermal shrinkage test device according to any one of claims 1 to 3, characterized in that: The heating box (1) comprises: A box body (11), one side of the box body (11) is provided with an opening (111), and the clamping assembly (2) is arranged inside the box body (11); A heating element is arranged in the box body (11); and A box door (12) is movably connected to the box body (11), and the box door (12) is used to close or open the opening (111).

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