A diaphragm testing device

Abstract

This utility model provides a separator testing device, relating to the field of battery testing equipment. The separator testing device provides a spacer to simulate a battery core, with the separator placed on the surface of the spacer, thus simulating the state of the outermost separator in the battery core. A driving component, a first pressure plate, and a second pressure plate are provided. The driving component drives the first pressure plate towards the second pressure plate, applying pressure to the separator. Therefore, the separator testing device proposed in this application can simulate the pressure applied to the separator during the battery core manufacturing process, thus simulating the separator after hot or cold pressing. The device measures the changes in the separator's air permeability and ionic conductivity using appropriate equipment, thereby assessing the separator's pressure resistance. This effectively evaluates the changes in the ionic conductivity of the separator after hot or cold pressing under different conditions, allowing for early identification of the pressure resistance window of different separators and providing a basis for product material selection.

Description

Technical Field

[0001] This utility model relates to the field of battery testing equipment technology, and more specifically, to a diaphragm testing device. Background Technology

[0002] The manufacturing process of lithium-ion batteries in related technologies typically involves sequentially winding the negative electrode, positive electrode, and separator, followed by hot or cold pressing to tightly bond the separator and electrodes together, shortening the lithium-ion diffusion path and reducing the battery's internal resistance. The separator is a crucial component of lithium-ion batteries, primarily serving to isolate the positive and negative electrodes, prevent short circuits, and provide an internal pathway for lithium-ion conduction.

[0003] In the manufacturing process of lithium-ion batteries, the internal pore size and porosity of the separator decrease after hot pressing, and may even cause localized pore blockage, thus affecting lithium-ion conduction and leading to lithium plating during cell cycling. Therefore, it is crucial to measure the changes in pore size and porosity of the separator after hot pressing in advance, i.e., the separator's pressure resistance.

[0004] However, current testing of the physical properties of incoming diaphragms only controls the air permeability before hot pressing, and there is no unified standard for measuring the changes in pore size and porosity of the diaphragm after hot pressing. Utility Model Content

[0005] The purpose of this invention is to provide a diaphragm testing device that can apply pressure to the diaphragm to simulate the process of applying pressure to the diaphragm during the core manufacturing process.

[0006] The embodiments of this utility model can be implemented as follows:

[0007] In a first aspect, this utility model provides a diaphragm testing device, which is used to apply pressure to a diaphragm, including:

[0008] The device body is provided with a first pressure plate and a second pressure plate spaced apart along a first direction;

[0009] A pad, wherein the pad is located between the first pressure plate and the second pressure plate, the pad is disposed on the first pressure plate, and the diaphragm is disposed on the surface of the pad along the first direction;

[0010] A drive assembly is disposed on the device body. The output end of the drive assembly is connected to the first pressure plate. The drive assembly is used to drive the first pressure plate to move toward the second pressure plate so that the first pressure plate applies pressure to the diaphragm.

[0011] In an optional embodiment, the diaphragm testing device includes a pressure control module, which is communicatively connected to the drive assembly, and is used to control the pressure applied to the diaphragm by the first pressure plate.

[0012] In an optional embodiment, a pressure sensor is provided on the lower surface of the first pressure plate, and the pressure sensor is communicatively connected to the pressure control module.

[0013] In an optional embodiment, the diaphragm testing device further includes a first barrier and a second barrier;

[0014] The first barrier is located between the diaphragm and the first pressure plate;

[0015] The second barrier is located between the diaphragm and the second pressure plate.

[0016] In an optional embodiment, the first barrier includes a first partition layer disposed on the lower surface of the first pressure plate, and the first partition layer is formed on the lower surface of the first pressure plate by coating.

[0017] Alternatively, the first barrier element may include a first barrier paper, which is movably disposed between the diaphragm and the first pressure plate.

[0018] In an optional embodiment, the second barrier includes a second partition layer disposed on the upper surface of the pad, the second partition layer being formed on the upper surface of the pad by coating;

[0019] Alternatively, the second barrier element may include a second barrier paper, which is movably disposed between the diaphragm and the second pressure plate.

[0020] In an optional embodiment, the diaphragm includes at least two diaphragms, which are stacked sequentially along the first direction, and a third barrier is movably disposed between adjacent diaphragms;

[0021] The size of the third barrier is larger than the size of the diaphragm.

[0022] In an optional embodiment, the drive assembly includes a drive member and a transmission shaft. The drive member is disposed on the top of the device body, and the transmission shaft is disposed along a first direction and passes through the device body. One end of the transmission shaft is connected to the output end of the drive member, and the other end is connected to the first pressure plate.

[0023] In an optional embodiment, the diaphragm testing device further includes at least two guide posts, which are spaced apart and arranged along a first direction. One end of each guide post is connected to the first pressure plate, and the other end passes through the device body.

[0024] In an optional embodiment, the pressure applied to the diaphragm by the diaphragm testing device ranges from 5t to 20t.

[0025] The beneficial effects of the diaphragm testing device provided in this embodiment of the invention include:

[0026] By setting up a pad to simulate the core, and placing the diaphragm on the surface of the pad, the state of the outermost diaphragm of the core is simulated. By setting up a driving component, a first pressure plate, and a second pressure plate, the driving component moves the first pressure plate towards the second pressure plate, causing the first pressure plate to apply pressure to the diaphragm. Therefore, the diaphragm testing device proposed in this application can simulate the process of applying pressure to the diaphragm during core manufacturing, thus simulating the diaphragm after hot or cold pressing. The device measures the changes in the air permeability and ionic conductivity of the diaphragm using appropriate equipment, thereby evaluating the pressure resistance of the diaphragm. This effectively assesses the changes in the ionic conductivity of the diaphragm after hot or cold pressing under different conditions, identifies the pressure resistance window of different diaphragms in advance, and provides a basis for product material selection. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the diaphragm testing device provided in this embodiment;

[0029] Figure 2 This is a schematic diagram showing the setup of two diaphragms in the diaphragm testing device provided in this embodiment.

[0030] Icons: 100 - Diaphragm testing device; X - Third direction; Y - Second direction; Z - First direction; 110 - Device body; 111 - Bracket; 112 - First mounting plate; 113 - Second mounting plate; 114 - Base; 115 - Guide column; 116 - Guide block; 117 - Connecting plate; 120 - First pressure plate; 130 - Second pressure plate; 140 - Pad; 150 - Drive assembly; 151 - Drive component; 152 - Drive shaft; 160 - Pressure control module; 170 - First barrier component; 180 - Second barrier component; 190 - Third barrier component; 200 - Diaphragm; 210 - First diaphragm sample; 220 - Second diaphragm sample. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0033] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0034] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed during use, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0035] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0036] It should be noted that, where there is no conflict, the features in the embodiments of this utility model can be combined with each other.

[0037] The following describes in detail the overall structure, working principle, and technical effects of the diaphragm testing device 100 provided by this utility model through embodiments and in conjunction with the accompanying drawings.

[0038] In related technologies, battery cells include wound cores. The manufacturing process of wound cores typically involves sequentially winding the negative electrode sheet, positive electrode sheet, and separator 200, followed by hot or cold pressing to ensure a tight bond between the separator 200 and the electrode sheets. In practical applications of battery cells, the permeability, ionic conductivity, and porosity of the separator 200 after hot or cold pressing have a more direct impact on its electrical performance. Specifically, after hot pressing, the internal pore size and porosity of the separator 200 decrease, potentially causing localized blockage, which affects lithium-ion conduction and leads to lithium plating during battery cell cycling.

[0039] The relevant technologies usually only test the physical properties of the diaphragm 200 itself, and lack a diaphragm testing device 100 as well as unified testing methods and standards to measure the performance changes of the diaphragm 200 after hot pressing or cold pressing.

[0040] Therefore, please refer to Figure 1 This utility model provides a diaphragm testing device 100, which is used to apply pressure to the diaphragm 200. The diaphragm testing device 100 is used to simulate the process of applying pressure to the diaphragm 200 during the core manufacturing process, thereby simulating the diaphragm 200 after hot pressing or cold pressing.

[0041] The diaphragm testing device 100 can apply pressure to different diaphragms 200 according to specified conditions and pressure.

[0042] Please refer to Figures 1-2 The present invention provides a diaphragm testing device 100, comprising:

[0043] The device body 110 has a first pressure plate 120 and a second pressure plate 130 spaced apart along the first direction Z.

[0044] The pad 140 is located between the first pressure plate 120 and the second pressure plate 130. The pad 140 is disposed on the first pressure plate 120, and the diaphragm 200 is disposed on the surface of the pad 140 along the first direction Z.

[0045] A drive assembly 150 is disposed on the device body 110. The output end of the drive assembly 150 is connected to the first pressure plate 120. The drive assembly 150 is used to drive the first pressure plate 120 to move toward the second pressure plate 130 so that the first pressure plate 120 applies pressure to the diaphragm 200.

[0046] It is understood that by setting a pad 140 to simulate the core, and placing the diaphragm 200 on the surface of the pad 140, the state of the outermost diaphragm 200 of the core is simulated. By setting a driving component 151, a first pressure plate 120, and a second pressure plate 130, the driving component 150 drives the first pressure plate 120 to move towards the second pressure plate 130, so that the first pressure plate 120 applies pressure to the diaphragm 200. Therefore, the diaphragm testing device 100 proposed in this application can simulate the process of applying pressure to the diaphragm 200 during core manufacturing, thereby simulating the diaphragm 200 after hot or cold pressing. The device measures the changes in air permeability and ionic conductivity of the diaphragm 200 to measure its pressure resistance. This effectively assesses the changes in the ionic conductivity of the diaphragm 200 under different conditions of hot or cold pressing, identifies the pressure resistance window of different diaphragms 200 in advance, and provides a basis for product material selection.

[0047] In this embodiment, the diaphragm testing device 100 has a first direction Z, a second direction Y, and a third direction X that are perpendicular to each other.

[0048] In this embodiment, the diaphragm testing device 100 includes a device body 110.

[0049] The device body 110 is used to support other structures.

[0050] In this embodiment, please refer to Figure 1 The device body 110 includes four brackets 111, a first mounting plate 112 and a second mounting plate 113. The four brackets 111 are arranged along the first direction Z. The bottom of the first mounting plate 112 is spaced apart and fixes the four brackets 111. The second mounting plate 113 is located below the first mounting plate 112 and spaced apart from the first mounting plate 112. The second mounting plate 113 is fixed to the four brackets 111.

[0051] In this embodiment, the device body 110 is provided with a first pressure plate 120 and a second pressure plate 130 spaced apart along the first direction Z; the first pressure plate 120 and the second pressure plate 130 are located between the first mounting plate 112 and the second mounting plate 113.

[0052] The second mounting plate 113 has a base 114 fixed to its top, and the top of the base 114 is connected to the second pressure plate 130.

[0053] A connecting plate 117 is fixed to the top of the first pressure plate 120.

[0054] In this embodiment, the diaphragm testing device 100 includes a drive assembly 150.

[0055] In this embodiment, please refer to Figure 1The drive assembly 150 is disposed on the device body 110. The output end of the drive assembly 150 is connected to the first pressure plate 120. The drive assembly 150 is used to drive the first pressure plate 120 to move toward the second pressure plate 130 so that the first pressure plate 120 applies pressure to the diaphragm 200.

[0056] The drive assembly 150 is fixed to the top of the first mounting plate 112 of the device body 110.

[0057] In this embodiment, the drive assembly 150 includes a drive member 151 and a transmission shaft 152. The drive member 151 is disposed on the top of the device body 110. The transmission shaft 152 is disposed along the first direction Z and passes through the first mounting plate 112 of the device body 110. One end of the transmission shaft 152 is connected to the output end of the drive member 151, and the other end is connected to the first pressure plate 120.

[0058] The drive component 151 is fixed to the top of the first mounting plate 112.

[0059] In this embodiment, please refer to Figure 1 The device body 110 is also provided with a guide structure for guiding the first pressure plate 120. The guide structure includes guide posts 115 and guide blocks 116. At least two guide blocks 116 are provided on the top of the first mounting plate 112, and the at least two guide blocks 116 are arranged opposite to the at least two guide posts 115.

[0060] Among them, at least two guide posts 115 are spaced apart and arranged along the first direction Z. One end of the at least two guide posts 115 is connected to the connecting plate 117 at the top of the first pressure plate 120, and the other end passes through the first mounting plate 112 and the guide block 116 of the device body 110.

[0061] Optionally, the number of guide posts 115 and guide blocks 116 is equal, and can be two, three, four, or other quantities.

[0062] It is understandable that by setting the guide post 115 and the guide block 116, the drive shaft 152 of the drive assembly 150 is guided, ensuring that the first pressure plate 120 can move stably along the first direction Z, and further ensuring that the first pressure plate 120 can apply pressure to the diaphragm 200 evenly.

[0063] In this embodiment, the diaphragm testing device 100 includes a pressure control module 160.

[0064] Please refer to Figure 1 The pressure control module 160 is communicatively connected to the drive assembly 150 and is used to control the pressure applied by the first pressure plate 120 to the diaphragm 200.

[0065] In this embodiment, a pressure sensor is provided on the lower surface of the first pressure plate 120, and the pressure sensor is communicatively connected to the pressure control module 160. The lower surface of the first pressure plate 120 has a groove, and the pressure sensor is fixed within the groove.

[0066] The pressure sensor is used to detect the pressure applied to the diaphragm 200 by the first pressure plate 120 and feed the pressure back to the pressure control module 160. The pressure control module 160 uses the feedback from the pressure sensor to precisely control the drive assembly 150 to drive the first pressure plate 120 to apply pressure to the diaphragm 200.

[0067] In this embodiment, the diaphragm testing device 100 includes a pad 140.

[0068] Among them, the pad 140 is used to simulate the core, and the diaphragm 200 is placed on the surface of the pad 140, thereby simulating the state of the outermost diaphragm 200 of the core.

[0069] In this embodiment, please refer to Figure 2 The pad 140 is located between the first pressure plate 120 and the second pressure plate 130. The pad 140 is disposed on the first pressure plate 120, and the diaphragm 200 is disposed on the surface of the pad 140 along the first direction Z.

[0070] Optionally, the pad 140 can be a scrapped core or an electrode sheet, or other elastic pad 140 similar to the core.

[0071] In this embodiment, the diaphragm testing device 100 further includes a first barrier 170 and a second barrier 180.

[0072] In this embodiment, please refer to Figure 2 The first barrier 170 is located between the diaphragm 200 and the first pressure plate 120; the second barrier 180 is located between the diaphragm 200 and the second pressure plate 130. The first barrier 170 and the second barrier 180 are used to prevent the diaphragm 200 from sticking to the first pressure plate 120 or the pad 140 under pressure.

[0073] In this embodiment, the first barrier 170 includes a first barrier paper, which is movably disposed between the diaphragm 200 and the first pressure plate 120. Specifically, the first barrier paper can be placed on the upper surface of the diaphragm 200 before the diaphragm testing device 100 applies pressure to the diaphragm 200.

[0074] In an optional embodiment, the first barrier 170 includes a first partition layer disposed on the lower surface of the first pressure plate 120, and the first partition layer is formed on the surface of the first pressure plate 120 by coating.

[0075] In this embodiment, the second barrier 180 includes a second barrier paper, which is movably disposed between the diaphragm 200 and the second pressure plate 130. Specifically, the second barrier paper can be placed on the upper surface of the second pressure plate 130 before the diaphragm testing device 100 applies pressure to the diaphragm 200.

[0076] In an optional embodiment, please refer to Figure 2 The second barrier 180 includes a second partition layer disposed on the upper surface of the pad 140, and the second partition layer is formed on the upper surface of the pad 140 by coating.

[0077] In some embodiments, the diaphragm testing device 100 can be used to apply pressure to a diaphragm 200.

[0078] In some embodiments, the diaphragm testing device 100 can be used to apply pressure to at least two diaphragms 200. The at least two diaphragms 200 can be at least two different types of diaphragms 200.

[0079] Further, please refer to Figure 2 The diaphragm 200 includes at least two diaphragms, which are stacked sequentially along the first direction Z. A third barrier 190 is movably disposed between adjacent diaphragms 200. The size of the third barrier 190 is larger than the size of the diaphragm 200. The third barrier 190 is used to prevent adhesion between adjacent diaphragms 200.

[0080] Please refer to Figures 1-2 The working principle and process of the diaphragm testing device 100 provided in this embodiment of the present invention are as follows:

[0081] 1. Material preparation: Prepare at least two different types of diaphragm 200; fold or cut the diaphragm 200 into diaphragm samples of a fixed area, with the sample area being 14cm*20cm.

[0082] 2. Stacking diaphragms 200: Place the pad 140 on the second pressure plate 130, and stack the second barrier 180, the diaphragm sample, the third barrier 190, the diaphragm sample, and the first barrier 170 on the pad 140 in sequence.

[0083] 3. Pressing the diaphragm 200: Set the parameters in the pressure control module 160: pressure 5t, time 150s, and then start running according to the set program to simulate the state of the outermost diaphragm 200 inside the core during hot or cold pressing.

[0084] 4. Measurement: Measure the air permeability and ionic conductivity of the diaphragm 200 before and after hot or cold pressing. The difference in air permeability and ionic conductivity of the diaphragm 200 is used to measure the difference in pressure resistance.

[0085] In this embodiment, the pressure applied by the diaphragm testing device 100 to the diaphragm 200 ranges from 5t to 20t. That is, the driving member 151 drives the first pressure plate 120 through the transmission shaft 152 to apply a pressure of 5t to 20t to the diaphragm 200; where t stands for ton, which usually refers to a ton.

[0086] Optionally, the driving component 151 drives the first pressure plate 120 to apply pressure to the diaphragm 200 via the transmission shaft 152, and the pressure value can be 5t, 6t, 7t, 8t, 9t, 10t, 11t, 12t, 13t, 14t, 15t, 16t, 17t, 18t, 19t, 20t, etc.

[0087] Preferably, the pressure applied by the diaphragm testing device 100 to the diaphragm 200 is in the range of 5t-15t.

[0088] The following are examples of diaphragm testing devices 100 applying different pressures to diaphragm 200.

[0089] Example 1

[0090] 1. Material preparation: Prepare the first diaphragm and the second diaphragm; fold or cut the first diaphragm and the second diaphragm into a first diaphragm sample 210 and a second diaphragm sample 220 with a fixed area of ​​14cm*20cm.

[0091] 2. Stacking diaphragms 200: Place the pad 140 on the second pressure plate 130, and stack the second barrier 180, the second diaphragm sample 220, the third barrier 190, the first diaphragm sample 210 and the first barrier 170 on the pad 140 in sequence.

[0092] 3. Pressing the diaphragm 200: Set the parameters in the pressure control module 160, select a pressure of 5t and a time of 150s, and then start running according to the set program to simulate the state of the outermost diaphragm 200 inside the core during hot or cold pressing.

[0093] 4. Measurement: Measure the air permeability and ionic conductivity of the diaphragm 200 before and after hot or cold pressing. The difference in air permeability and ionic conductivity of the diaphragm 200 is used to measure the difference in pressure resistance.

[0094] Example 2

[0095] The steps are the same as in Example 1, except that the pressure selected in this example is 7t.

[0096] Example 3

[0097] The steps are the same as in Example 1, except that the pressure selected in this example is 9t.

[0098] Example 4

[0099] The steps are the same as in Example 1, except that the pressure selected in this example is 11t.

[0100] Example 5

[0101] The steps are the same as in Example 1, except that the pressure selected in this example is 13t.

[0102] Example 6

[0103] The steps are the same as in Example 1, except that the pressure selected in this example is 15t.

[0104] Example 7

[0105] Prepare the first diaphragm and the second diaphragm; fold or cut the first diaphragm and the second diaphragm into a first diaphragm sample 210 and a second diaphragm sample 220 with a fixed area of ​​14cm*20cm.

[0106] The first diaphragm sample 210 and the second diaphragm sample 220 are not subjected to hot pressing.

[0107] Table 1 shows the air permeability and ionic conductivity corresponding to Examples 1-7.

[0108]

[0109] In summary, the diaphragm testing device 100 provided in this embodiment of the present invention simulates the state of the outermost diaphragm 200 of the core by setting a pad 140, which is used to simulate the core. The diaphragm 200 is placed on the surface of the pad 140. By setting a driving component 151, a first pressure plate 120 and a second pressure plate 130, the driving component 150 drives the first pressure plate 120 to move toward the second pressure plate 130, so that the first pressure plate 120 applies pressure to the diaphragm 200. Therefore, the diaphragm testing device 100 proposed in this application can simulate the process of applying pressure to the diaphragm 200 during the core manufacturing process, thereby simulating the diaphragm 200 after hot pressing or cold pressing. The device can then measure the changes in air permeability and ionic conductivity of the diaphragm 200 to measure its pressure resistance. This allows for the effective assessment of changes in the ion conductivity of the diaphragm 200 after hot or cold pressing under different conditions, enabling early identification of the pressure resistance window of different diaphragms 200 and providing a basis for product material selection.

[0110] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model.

Claims

1. A diaphragm testing device, characterized in that, The diaphragm testing device is used to apply pressure to the diaphragm, including: The device body is provided with a first pressure plate and a second pressure plate spaced apart along a first direction; A pad, wherein the pad is located between the first pressure plate and the second pressure plate, the pad is disposed on the first pressure plate, and the diaphragm is disposed on the surface of the pad along the first direction; A drive assembly is disposed on the device body. The output end of the drive assembly is connected to the first pressure plate. The drive assembly is used to drive the first pressure plate to move toward the second pressure plate so that the first pressure plate applies pressure to the diaphragm.

2. The diaphragm testing device according to claim 1, characterized in that, The diaphragm testing device includes a pressure control module, which is communicatively connected to the drive assembly. The pressure control module is used to control the pressure applied to the diaphragm by the first pressure plate.

3. The diaphragm testing device according to claim 2, characterized in that, A pressure sensor is provided on the lower surface of the first pressure plate, and the pressure sensor is communicatively connected to the pressure control module.

4. The diaphragm testing device according to claim 1, characterized in that, The diaphragm testing device also includes a first barrier and a second barrier; The first barrier is located between the diaphragm and the first pressure plate; The second barrier is located between the diaphragm and the second pressure plate.

5. The diaphragm testing device according to claim 4, characterized in that, The first barrier includes a first partition layer, which is disposed on the lower surface of the first pressure plate and is formed on the lower surface of the first pressure plate by coating. Alternatively, the first barrier element may include a first barrier paper, which is movably disposed between the diaphragm and the first pressure plate.

6. The diaphragm testing device according to claim 4, characterized in that, The second barrier includes a second partition layer disposed on the upper surface of the pad, and the second partition layer is formed on the upper surface of the pad by coating; Alternatively, the second barrier element may include a second barrier paper, which is movably disposed between the diaphragm and the second pressure plate.

7. The diaphragm testing device according to claim 1, characterized in that, The diaphragm includes at least two diaphragms, which are stacked sequentially along the first direction, and a third barrier is movably disposed between adjacent diaphragms. The size of the third barrier is larger than the size of the diaphragm.

8. The diaphragm testing device according to claim 1, characterized in that, The drive assembly includes a drive component and a transmission shaft. The drive component is disposed on the top of the device body. The transmission shaft is disposed along a first direction and passes through the device body. One end of the transmission shaft is connected to the output end of the drive component, and the other end is connected to the first pressure plate.

9. The diaphragm testing device according to claim 1, characterized in that, The diaphragm testing device further includes at least two guide posts, which are spaced apart and arranged along a first direction. One end of each guide post is connected to the first pressure plate, and the other end passes through the device body.

10. The diaphragm testing apparatus according to claim 1, characterized in that, The pressure applied to the diaphragm by the diaphragm testing device ranges from 5t to 20t.

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