Device and method for detecting compression failure of ionic membrane

Abstract

The invention relates to a device and a method for detecting compression failure of an ionic membrane. The detection device comprises an ionic membrane clamping unit which comprises a first cavity, a second cavity and a clamping piece, the first cavity is provided with a first opening and a second opening which are oppositely arranged, the second cavity is provided with a third opening and a fourth opening which are oppositely arranged, and the clamping piece is arranged between the second opening and the third opening and used for clamping an ionic membrane to be detected; the pressure applying unit comprises a movable first pressure applying assembly and a movable second pressure applying assembly, the first pressure applying assembly is provided with a first surface facing the ionic membrane, the second pressure applying assembly is provided with a second surface facing the ionic membrane, and electrode materials are arranged on the first surface and the second surface; the failure detection unit comprises a liquid inlet unit and / or a gas inlet unit, and the failure detection unit is used for detecting whether the compressed ionic membrane fails or not according to the conductivity of the liquid and / or the bubbles in the second cavity.

Description

Technical Field

[0001] This application mainly relates to the field of batteries, and specifically to a detection device and method for detecting ion membrane compression failure. Background Technology

[0002] In the structural design of flow batteries or fuel cells, a certain compression ratio is typically applied to the electrodes to ensure good interfacial contact between the electrodes and the ion exchange membrane (ion membrane) and bipolar plates. When the electrode compression ratio is set too high or the assembly process parameters are incorrect, localized stress concentration can occur, potentially causing the electrodes to puncture the ion membrane, leading to membrane failure. This can result in serious consequences such as electrolyte cross-contamination, battery performance degradation, and even internal short circuits. Furthermore, in current technologies, the setting of the electrode compression ratio relies primarily on empirical data, lacking systematic theoretical guidance, making it difficult to ensure the reliability of the fuel cell stack. Summary of the Invention

[0003] To address the aforementioned technical problems, this application provides a detection device for ion membrane compression failure, comprising: an ion membrane clamping unit, including a first cavity, a second cavity, and a clamping member; the first cavity having a first opening and a second opening disposed opposite to each other, the second cavity having a third opening and a fourth opening disposed opposite to each other, and the clamping member being disposed between the second opening and the third opening for clamping the ion membrane to be detected; and a pressure applying unit, including a movable first pressure applying component and a movable second pressure applying component; the first pressure applying component having a first surface facing the ion membrane, and the second pressure applying component having a second surface facing the ion membrane; both the first surface and the second surface being provided with electrode material; the first pressure applying component and the second pressure applying component being used to jointly compress the ion membrane; wherein the first pressure applying component is configured to: enter the first cavity from the first opening and move between a first compression position and a first detection position; wherein the first compression position is when the electrode material of the first surface contacts and compresses the ion membrane. The first pressure component is positioned at the first detection position, where the first cavity, the ion membrane, and the first pressure component together form a sealed first chamber. The second pressure component is configured to enter the second cavity through the fourth opening and move between a second compression position and a second detection position. The second compression position is the position where the electrode material on the second surface contacts and compresses the ion membrane. When the second pressure component is located at the second detection position, the second cavity, the ion membrane, and the second pressure component together form a sealed second chamber. The failure detection unit includes a liquid inlet unit and / or a gas inlet unit. The liquid inlet unit is used to input liquid into the first chamber and / or the second chamber, and the gas inlet unit is used to input gas into the first chamber. The failure detection unit is used to detect whether the compressed ion membrane has failed based on the conductivity of the liquid and / or, based on the air bubbles in the second chamber.

[0004] In one embodiment of this application, the clamping member includes a first clamping member and a second clamping member, the first clamping member being disposed around the second opening and the second clamping member being disposed around the third opening, the first clamping member and the second clamping member being used to jointly clamp the ion membrane.

[0005] In one embodiment of this application, the detection device further includes a first seal and a second seal, the first seal being disposed around the first opening and the second seal being disposed around the fourth opening.

[0006] In one embodiment of this application, the first clamping member includes a first side and a second side disposed opposite to each other, wherein the first side is close to the ion membrane and has a first groove, the second clamping member includes a third side and a fourth side disposed opposite to each other, the third side is close to the ion membrane and has a second groove, the ion membrane clamping unit further includes a first sealing ring and a second sealing ring, the first sealing ring is embedded in the first groove, the second sealing ring is embedded in the second groove, and the first sealing ring and the second sealing ring are respectively tightly connected to the ion membrane.

[0007] In one embodiment of this application, the ion membrane clamping unit further includes a first fastening device, a second fastening device, and a first fastener. The first fastening device includes a first sealing gasket and a first flange, wherein the first sealing gasket and the first flange are sequentially arranged along a first direction away from the second side. The second fastening device includes a second sealing gasket and a second flange, wherein the second sealing gasket and the second flange are sequentially arranged along a second direction away from the fourth side. The first cavity further includes a first extension surrounding the second opening, and the second cavity further includes a second extension surrounding the third opening. The first fastener is used to tightly connect the first flange, the first extension, the first sealing gasket, the first clamping member, the second clamping member, the second sealing gasket, the second extension, and the second flange.

[0008] In one embodiment of this application, the first pressure-applying component includes a third groove and a third sealing ring. The first pressure-applying component includes a first end and a second end disposed opposite to each other. The first surface is disposed at the first end. The third groove is disposed on the outer periphery of the first pressure-applying component and between the first end and the second end. The third sealing ring is embedded in the third groove. When the first pressure-applying component is located at the first detection position, the third sealing ring and the first cavity are tightly connected, so that the first cavity, the ion membrane, and the first pressure-applying component together form a sealed first chamber. The second pressure-applying component includes a fourth groove and a fourth sealing ring. The second pressure-applying component includes a third end and a fourth end disposed opposite to each other. The second surface is disposed at the third end. The fourth groove is disposed on the outer periphery of the second pressure-applying component and between the third end and the fourth end. The fourth sealing ring is embedded in the fourth groove. When the second pressure-applying component is located at the second detection position, the fourth sealing ring and the second cavity are tightly connected, so that the second cavity, the ion membrane, and the second pressure-applying component together form a sealed second chamber.

[0009] In one embodiment of this application, the liquid inlet unit includes a first liquid inlet pipe, a first liquid outlet pipe, a second liquid inlet pipe, and a second liquid outlet pipe. The first cavity includes a first liquid inlet and a first liquid outlet. The first liquid inlet pipe is connected to the first liquid inlet and is used to input a first solution into the first cavity. The first liquid outlet pipe is connected to the first liquid outlet and is used to output the first solution from the first cavity. The second cavity includes a second liquid inlet and a second liquid outlet. The second liquid inlet pipe is connected to the second liquid inlet and is used to input a second solution into the second cavity. The second liquid outlet pipe... The first solution and the second solution are connected to the second outlet for outputting the second solution from the second chamber. The conductivity of the first solution and the conductivity of the second solution are different. The failure detection unit further includes a conductivity detector. The first chamber and / or the second chamber are provided with a detector mounting port for mounting the conductivity detector. The conductivity detector can detect the conductivity of the corresponding first solution and / or the conductivity of the corresponding second solution, and confirm whether the ion membrane has failed based on the rate of change of conductivity of the first solution and / or the rate of change of conductivity of the second solution.

[0010] In one embodiment of this application, the first solution comprises deionized water, and the second solution comprises a metal salt solution.

[0011] In one embodiment of this application, the air intake unit includes an air intake pipe and an air outlet pipe. The first cavity includes an air inlet and an air outlet. The air intake pipe is connected to the air inlet and is used to input gas into the first cavity. The air outlet pipe is connected to the air outlet and is used to output the gas from the first cavity to the outside. The liquid intake unit includes a second liquid intake pipe and a second liquid outlet pipe. The second cavity includes a second liquid inlet and a second liquid outlet. The second liquid intake pipe is connected to the second liquid inlet and is used to input a third solution into the second cavity. The second liquid outlet pipe is connected to the second liquid outlet and is used to output the third solution from the second cavity to the outside. The failure detection unit is used to confirm whether the ion membrane has failed based on whether air bubbles appear in the second cavity. In one embodiment of this application, the detection device further includes a base. The ion membrane clamping unit and the pressure application unit are both disposed on the base. The base includes a graduated guide rail, and the pressure application unit is movably disposed on the guide rail.

[0012] This application also provides a method for detecting ion membrane compression failure, performed by the aforementioned detection device, including:

[0013] Step S1110: Clamp the ion membrane with the clamping member; Step S1120: Drive the first pressure application component to enter the first cavity from the first opening and reach the first compression position, and drive the second pressure application component to enter the second cavity from the fourth opening and reach the second compression position, so that the second pressure application component and the first pressure application component jointly compress the ion membrane; Step S1130: After the second pressure application component and the first pressure application component jointly compress the ion membrane for a first preset time, drive the second pressure application component to move to the first detection position, and drive the first pressure application component to move to the second detection position; and Step S1140: Control the liquid inlet unit to input liquid into the first chamber and / or the second chamber, and the failure detection unit detects whether the compressed ion membrane is ineffective based on the conductivity of the liquid, and / or control the gas inlet unit to input gas into the first chamber, and the failure detection unit detects whether the compressed ion membrane is ineffective based on the air bubbles in the second chamber. In one embodiment of this application, the detection method further includes: repeatedly executing steps S1120-S1140, and changing the first compression position and the second compression position each time step S1130 is executed;

[0014] In response to the detection of failure of the compressed ion membrane in step S1140, the cycle is stopped, and the electrode compression ratio corresponding to the failure of the ion membrane is obtained according to the current first compression position and second compression position, wherein the electrode compression ratio is the ratio of the electrode material compressed by the pressure application unit.

[0015] In one embodiment of this application, before step S1120, the method further includes: connecting the first chamber to the outside atmosphere, and / or connecting the second chamber to the outside atmosphere.

[0016] In one embodiment of this application, step S1120 further includes: during the process of driving the first pressure-applying component from the first opening into the first cavity and reaching the first compression position, recording the first contact position when the first pressure-applying component just contacts the ion membrane; during the process of driving the second pressure-applying component from the fourth opening into the second cavity and reaching the second compression position, recording the second contact position when the second pressure-applying component just contacts the ion membrane; obtaining the electrode compression ratio corresponding to the failure of the ion membrane based on the current first compression position and second compression position, including: calculating the electrode compression ratio C2 using any of the following formulas:

[0017] C2 = |D1 - D2| / D0 × 100%

[0018] C2 = |D3-D4| / D0×100%

[0019] Wherein, D0 is the original thickness of the electrode material, D1 is the first contact position, D2 is the current first compression position, D3 is the second contact position, and D4 is the current second compression position.

[0020] In one embodiment of this application, step S1140, which involves controlling the liquid inlet unit to input liquid into the first chamber and / or the second chamber, and the failure detection unit detecting whether the compressed ion membrane has failed based on the conductivity of the liquid, includes: controlling the liquid inlet unit to introduce a first solution into the first chamber and a second solution into the second chamber, wherein the first solution has a first conductivity and the second solution has a second conductivity, and the first conductivity and the second conductivity are different; after a second preset time, using a conductivity detector to detect the first conductivity of the first solution in the first chamber and / or the second conductivity of the second solution in the second chamber; and determining that the ion membrane has failed in response to the rate of change of the first conductivity being within a first preset range and / or the rate of change of the second conductivity being within a second preset range.

[0021] In one embodiment of this application, step S1140, which involves controlling the air intake unit to input gas into the first chamber, and the failure detection unit detecting whether the compressed ion membrane has failed based on the air bubbles in the second chamber, includes:

[0022] The air intake unit is controlled to introduce a first gas into the first chamber, and the liquid intake unit is controlled to introduce a third solution into the second chamber; and

[0023] The presence of bubbles in the second chamber indicates that the ion exchange membrane has failed.

[0024] This application employs an ion membrane clamping unit to hold the ion membrane to be tested, and a pressure application unit comprising a movable first pressure application component and a movable second pressure application component. Electrode material is disposed on a first surface of the first pressure application component facing the ion membrane, and on a second surface of the second pressure application component facing the ion membrane. When the first pressure application component is in a first compression position and the second pressure application component is in a second compression position, the electrode material can contact and compress the ion membrane, thereby simulating a scenario in a battery where the ion membrane is compressed at a certain electrode compression ratio. When the first pressure application component is in a first detection position and the second pressure application component is in a second detection position, the liquid inlet unit or gas inlet unit of the failure detection unit injects liquid or gas into the sealed first chamber or sealed second chamber. Based on the conductivity of the liquid and / or on the air bubbles in the second chamber, it is determined whether the ion membrane has failed at the electrode compression ratio, and thus whether the electrode compression ratio setting is appropriate. Therefore, by providing the ion membrane clamping unit, the pressure application unit, and the failure detection unit, this application can provide systematic theoretical guidance for setting the electrode compression ratio of the battery, thereby ensuring the reliability of the battery stack product. Attached Figure Description

[0025] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, the specific embodiments of this application will be described in detail below with reference to the accompanying drawings, wherein:

[0026] Figure 1 This is a schematic diagram of an ion membrane compression failure detection device according to an embodiment of this application;

[0027] Figure 2 This is a schematic diagram of the cavity structure according to an embodiment of this application;

[0028] Figure 3 It shows Figure 1 An enlarged schematic diagram of region A in the illustrated embodiment;

[0029] Figure 4 A schematic diagram of the structure of a pressure application unit according to an embodiment of this application is shown;

[0030] Figure 5 A flowchart of an embodiment of the ion membrane compression failure detection method of this application is shown;

[0031] Figure 6 A schematic diagram of the electrode compression ratio-conductivity curve of an embodiment of this application is shown. Detailed Implementation

[0032] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, the specific embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0033] Many specific details are set forth in the following description in order to provide a full understanding of this application. However, this application may also be implemented in other ways different from those described herein, and therefore this application is not limited to the specific embodiments disclosed below.

[0034] As illustrated in this application, unless the context clearly indicates otherwise, the words "a," "an," "an," and / or "the" do not specifically refer to the singular and may also include the plural. Generally speaking, the terms "comprising" and "including" only indicate the inclusion of explicitly identified steps and elements, which do not constitute an exclusive list, and the method or apparatus may also include other steps or elements.

[0035] Currently, commercial electrodes primarily utilize porous carbon-based fiber materials. Due to the inherent characteristics of manufacturing processes and heat treatment, fiber breaks are unavoidable on the electrode surface. Existing commercial ion-exchange membranes generally employ 50μm thick perfluorosulfonic acid membranes. According to standard GB / T 37841-2019, the maximum puncture resistance of perfluorosulfonic acid membranes under dry conditions ranges from 5 to 8 N, while the maximum puncture resistance under swollen conditions will further decrease. When the electrode compression ratio is too high or assembly process parameters are incorrect, localized stress concentration can occur, potentially leading to ion-exchange membrane puncture failure, resulting in serious consequences such as electrolyte cross-contamination, battery performance degradation, and even internal short circuits. However, the current electrode compression ratio settings mainly rely on empirical data, lacking systematic theoretical guidance, making it difficult to ensure the reliability of fuel cell stack products.

[0036] To accurately simulate the mechanical stress effect of electrode materials on ion exchange membranes, establish a theoretical basis for the safe threshold of compression ratio, and achieve precise detection of ion exchange membrane puncture failure, this application proposes a detection device and method for ion exchange membrane compression failure.

[0037] The detection device and method for ion membrane compression failure proposed in this application are applicable not only to all-vanadium flow batteries with ion membranes, but also to other flow batteries or fuel cells with ion membranes.

[0038] Figure 1 An embodiment of the present application is shown of a detection device for ion membrane compression failure. Figure 2 A schematic diagram of the cavity structure according to an embodiment of this application is shown.

[0039] like Figure 1 and Figure 2As shown, the present application discloses an ion membrane compression failure detection device 100, comprising: an ion membrane clamping unit, a pressure application unit, and a failure detection unit. The ion membrane clamping unit includes a first cavity 111, a second cavity 112, and a clamping member 113. The first cavity 111 has a first opening 1111 and a second opening 1112 disposed opposite to each other. The second cavity 112 has a third opening 1121 and a fourth opening 1122 disposed opposite to each other. The clamping member 113 is disposed between the second opening 1112 and the third opening 1121 for clamping the ion membrane 200 to be tested. The pressure application unit includes a movable first pressure application component 121 and a movable second pressure application component 122. The first pressure application component 121 has a first surface 1211 facing the ion membrane 200, and the second pressure application component 122 has a second surface 1221 facing the ion membrane 200. Both the first surface 1211 and the second surface 1221 are provided with electrode material. The first pressure application component 121 and the second pressure application component 122 are used to jointly compress the ion membrane 200. The first pressure application component 121 is configured to enter the first cavity 111 from the first opening 1111 and move between a first compression position and a first detection position. The first compression position is where the electrode material of the first surface 1211 contacts and compresses the ion membrane. The first pressure component 121 is positioned at the membrane 200. When the first pressure component 121 is in the first detection position, the first cavity 111, the ion membrane 200, and the first pressure component 121 together form a sealed first chamber 111a. The second pressure component is configured to enter the second cavity 112a through the fourth opening and move between the second compression position and the second detection position. The second compression position is the position of the second pressure component 122 when the electrode material of the second surface 1221 contacts and compresses the ion membrane 200. When the second pressure component 122 is in the second detection position, the second cavity 112, the ion membrane 200, and the second pressure component 122 together form a sealed second chamber 112a. The failure detection unit includes a liquid inlet unit 131 and / or an air inlet unit 132. The liquid inlet unit 131 is used to input liquid into the first chamber 111a and / or the second chamber 112a, and the air inlet unit 132 is used to input gas into the first chamber 111a. The failure detection unit is used to detect whether the compressed ion membrane 200 has failed based on the conductivity of the liquid and / or based on the air bubbles in the second chamber 112a.

[0040] This application employs an ion membrane clamping unit to clamp the ion membrane 200 to be tested, and a pressure application unit comprising a movable first pressure application component 121 and a movable second pressure application component 122. Electrode material is disposed on the first surface 1211 of the first pressure application component 121 facing the ion membrane 200, and electrode material is disposed on the second surface 1221 of the second pressure application component 122 facing the ion membrane 200. When the first pressure application component 121 is in a first compression position and the second pressure application component 122 is in a second compression position, the electrode material can contact and compress the ion membrane 200, thereby simulating the scenario in a battery where a bipolar plate compresses the ion membrane 200 at a certain electrode compression ratio. When the first pressure application component 121 is in a first detection position and the second pressure application component 122 is in a second detection position, the failure detection unit can determine whether the ion membrane 200 has failed at this electrode compression ratio based on the conductivity of the liquid and / or on the air bubbles in the second chamber 112a, thereby determining whether the electrode compression ratio setting is safe. Therefore, by setting up an ion membrane clamping unit, a pressure application unit, and a failure detection unit, this application can accurately simulate the structural characteristics and stress state of key components (bipolar plates, electrodes, and ion membranes) inside the fuel cell stack, thereby providing systematic theoretical guidance for setting the electrode compression ratio of the battery and ensuring the reliability of the fuel cell stack product.

[0041] like Figure 1 As shown, in some embodiments, the first cavity 111 and the second cavity 112 have the same structure and size, and are symmetrically arranged on both sides of the ion membrane 200. Similarly, the first pressure-applying component 121 and the second pressure-applying component 122 have the same structure and size, and are symmetrically arranged on both sides of the ion membrane 200. By setting symmetrical first cavities 111 and 112, and symmetrical first pressure-applying components 121 and 122, it can be ensured that the pressure applied to both sides of the ion membrane is the same, thereby more accurately simulating the scenario of electrode compression of the ion membrane in a battery.

[0042] Figure 3 It shows Figure 1 An enlarged schematic diagram of region A in the illustrated embodiment. (See diagram below.) Figure 1 and Figure 3As shown, in some embodiments, the clamping member 113 includes a first clamping member 1131 and a second clamping member 1132. The first clamping member 1131 is disposed around the second opening 1112, and the second clamping member 1132 is disposed around the third opening 1121. The first clamping member 1131 and the second clamping member 1132 are used to jointly clamp the ion membrane 200. By distributing the first clamping member 1131 around the second opening 1112 and the second clamping member 1132 around the third opening 1121, the portion of the ion membrane 200 used for compression is exposed between the second opening 1112 and the third opening 1121, so that the electrode materials on the first surface 1211 of the first pressure-applying component 121 and the second surface 1221 of the second pressure-applying component 122 can contact and compress the ion membrane 200. The area of ​​contact between the electrode materials and the ion membrane 200 is the effective area of ​​the ion membrane 200, which is used to simulate the active reaction zone where the ion membrane 200 contacts the electrolyte in a battery.

[0043] In some embodiments, the first clamping member 1131 and the second clamping member 1132 are hollow castings, that is, the first clamping member 1131 and the second clamping member 1132 are U-shaped structures with a central opening, which is used to adapt to the effective area of ​​the ion membrane 200.

[0044] In some embodiments, the openings of the first clamping member 1131 and the second clamping member 1132 are the same in shape and size as the effective area of ​​the ion membrane 200. In some embodiments, the second opening 1112, the third opening 1121, the opening of the first clamping member 1131, and the opening of the second clamping member 1132 are all identical in size and shape. The first clamping member 1131 is disposed on the outer periphery of the second opening 1112 without obstructing the second opening 1112, and the second clamping member 1132 is disposed on the outer periphery of the third opening 1121 without obstructing the third opening 1121. In this case, the shape and size of the effective area of ​​the ion membrane 200 can be set to be the same as those of the second opening 1112, the third opening 1121, the opening of the first clamping member 1131, and the opening of the second clamping member 1132. In some other embodiments, a portion of the first clamping member 1131 may block the second opening 1112, and a portion of the second clamping member 1132 may block the third opening 1121. In this case, the shape and size of the openings of the first clamping member 1131 and the second clamping member 1132 and the effective area region of the ion membrane 200 can still be set to be the same, but the effective area of ​​the ion membrane 200 is smaller than the area of ​​the second opening 1112 and the area of ​​the third opening 1121.

[0045] In some embodiments, the shape and size of the opening of the first clamping member 1131 and the opening of the second clamping member 1132 may be different from the shape and size of the effective area region of the ion membrane 200, and the area of ​​the opening of the first clamping member 1131 and the area of ​​the opening of the second clamping member 1132 may be larger than the effective area of ​​the ion membrane 200.

[0046] like Figure 3 As shown, in some embodiments, the first clamping member 1131 includes a first side surface 1131a and a second side surface 1131b disposed opposite to each other. The first side surface 1131a is close to the ion exchange membrane 200 and has a first groove (not shown). The second clamping member 1132 includes a third side surface 1132a and a fourth side surface 1132b disposed opposite to each other. The third side surface 1132a is close to the ion exchange membrane 200 and has a second groove (not shown). The ion exchange membrane clamping unit also includes a first sealing ring 1141 and a second sealing ring 1142. The first sealing ring 1141 is embedded in the first groove, and the second sealing ring 1142 is embedded in the second groove. After the ion exchange membrane 200 is installed, the first sealing ring 1141 and the second sealing ring 1142 are tightly connected to the ion exchange membrane 200.

[0047] By providing a first sealing ring 1141 on the third side 1132a and a second sealing ring 1142 on the fourth side 1132b, both sides of the ion exchange membrane 200 are provided with sealing rings that are tightly connected to the ion exchange membrane 200. This effectively improves the sealing performance between the ion exchange membrane 200 and the clamping member 113, ensuring the airtightness of the first chamber 111a and the second chamber 112a during failure detection, preventing gas and / or liquid from leaking from the gap between the ion exchange membrane 200 and the clamping member 113. Simultaneously, the elastic deformation of the sealing ring under pressure can fill the tiny gaps between the clamping member 113 and the ion exchange membrane 200, thereby forming a uniform contact pressure between the clamping member 113 and the ion exchange membrane 200, avoiding local loosening, and enhancing the stability of the clamping member 113 in holding the ion exchange membrane 200.

[0048] In some embodiments, the thickness of the first sealing ring 1141 is greater than the depth of the first groove, so that the first sealing ring 1141 protrudes from the first groove, thereby ensuring good sealing performance of the first chamber 111a when the first sealing ring 1141 and the ion membrane 200 are tightly connected. Similarly, the thickness of the second sealing ring 1142 is greater than the depth of the second groove, so that the second sealing ring 1142 protrudes from the first groove, thereby ensuring good sealing performance of the second chamber 112a when the second sealing ring 1142 and the ion membrane 200 are tightly connected.

[0049] In some embodiments, the area of ​​the outline of the first sealing ring 1141 is smaller than the area of ​​the ion exchange membrane 200, so that the outer periphery of the ion exchange membrane 200 is outside the first sealing ring 1141, and thus can be better clamped by the clamping member 113. In some embodiments, the length (or width) of the cut dimension of the ion exchange membrane 200 is slightly larger than the length (or width) of the sealing ring by 2 to 5 mm.

[0050] like Figure 2 and Figure 3 As shown, in some embodiments, the ion membrane clamping unit further includes a first fastening device, a second fastening device, and a first fastener 117. The first fastening device includes a first sealing gasket 1151 and a first flange 1152, wherein the first sealing gasket 1151 and the first flange 1152 are sequentially arranged along a first direction F1 away from the second side surface 1131b. The second fastening device includes a second sealing gasket 1161 and a second flange 1162, wherein the second sealing gasket 1161 and the second flange 1162 are arranged along a first direction F1 away from the fourth side surface 1131b. The second direction F2 of 132b is arranged sequentially. The first cavity 111 also includes a first extension 1112b surrounding the second opening 1112. The second cavity 112 also includes a second extension 1121b surrounding the third opening 1121. The first flange 1152, the first gasket 1151, the first extension 1112b, the first clamping member 1131, the second clamping member 1132, the second gasket 1161, the second extension 1121b, and the second flange 1162 are tightly connected by the first fastener 117.

[0051] By setting the first fastening device, the second fastening device, and the first fastener 117, it is ensured that the ion exchange membrane 200 is stably clamped between the clamping members 113 and between the first cavity 111 and the second cavity 112, preventing displacement or loosening of the ion exchange membrane 200. By setting the first sealing gasket 1151 and the first flange 1152 between the first clamping member 1131 and the first cavity 111, on the one hand, the first sealing gasket 1151 combined with the first flange 1152 forms a sealing barrier, which can effectively prevent gas or liquid from leaking from between the clamping member 1131 and the first cavity 111; on the other hand, the setting of the first sealing gasket 1151 and the first flange 1152 provides rigid support for the ion exchange membrane clamping unit, making the ion exchange membrane clamping unit more stable when clamping the ion exchange membrane 200. Similarly, by providing a second sealing gasket 1161 and a second flange 1162 between the second clamping member 1132 and the second cavity 112, leakage of gas or liquid between the second clamping member 1132 and the second cavity 112 can be effectively prevented. At the same time, this makes the ion membrane clamping unit more secure when clamping the ion membrane 200. The first extension 1112b, combined with the first fastener 117, facilitates a better fixed connection between the first cavity 111 and the first clamping member 1131. Similarly, the second extension 1121b, combined with the first fastener 117, facilitates a better fixed connection between the second cavity 112 and the second clamping member 1132.

[0052] In some embodiments, the structures of the first sealing gasket 1151, the first flange 1152, the second sealing gasket 1161, and the second flange 1162 should be adapted to the clamping member 113 so that they can combine with the clamping member 113, the first cavity 111, or the second cavity 112 to achieve a sealing effect without affecting the compression of the ion membrane 200 by the pressure application unit 120. For example, as Figure 3 As shown, in some embodiments, the first sealing gasket 1151, the first flange 1152, and the first clamping member 1131 have the same height, and the second sealing gasket 1161, the second flange 1162, and the second clamping member 1132 have the same height. In some embodiments, the first sealing gasket 1151, the first flange 1152, and the first clamping member 1131 have the same shape, all being a U-shaped structure, wherein the opening area of ​​the first sealing gasket 1151 and the opening area of ​​the first flange 1152 are greater than or equal to the opening area of ​​the first clamping member 1131.

[0053] In some embodiments, a gasket may be used instead of the first flange 1152 and / or the second flange 1162.

[0054] like Figure 3As shown, in some embodiments, the first fastener 117 includes a plurality of screws, and the outer periphery of the first clamping member 1131 and the second clamping member 1132 is provided with a plurality of evenly distributed first holes 1171 to allow the plurality of screws to pass through, thereby clamping and fixing the ion membrane 20 between the clamping members 113 and between the first cavity 111 and the second cavity 112. By setting the first fastener 117 as screws, it is convenient to place and remove the ion membrane 200. In some embodiments, in order to facilitate the placement and removal of the ion membrane 200, the first cavity 111, the second cavity 112 and the clamping member 113 can also be connected by other non-fixed connection methods, and this application does not impose specific limitations on this.

[0055] like Figure 2 As shown, in some embodiments, both the first extension 1112b and the second extension 1121b have a U-shaped structure, which is the same shape as the clamping member 113. In some embodiments, both the first extension 1112b and the second extension 1121b are provided with a plurality of second holes 1172. The second holes 1172 and the first holes 1171 cooperate to allow the first fastener 117 to pass through so that the first cavity 111 and the first clamping member 1131 are combined, and the second cavity 112 and the second clamping member 1132 are better combined.

[0056] like Figure 3 As shown, in some embodiments, a first sealing gasket 1151 is provided on each side of the first extension 1112b, and the two first sealing gaskets 1151 are in close contact with the second extension 1112b to prevent gas or liquid in the first chamber 111a from leaking between the first chamber 111 and the first clamping member 1131, or between the first chamber 111 and the first flange 1152; a second sealing gasket 1161 is provided on each side of the second extension 1121b, and the two second sealing gaskets 1161 are in close contact with the third extension 1121b to prevent gas or liquid in the second chamber 112a from leaking between the second chamber 112 and the second clamping member 1132, or between the second chamber 112 and the second flange 1162, further improving the sealing performance of the ion membrane clamping unit.

[0057] In some embodiments, the ion membrane to be tested 200 can be placed between the first sealing ring 1141 and the second sealing ring 1142, and then the clamping member 113, the first fastening device and the second fastening device, the first cavity 111 and the second cavity 112 can be aligned in sequence, and then the ion membrane clamping unit can be connected by tightening the screw (first fastener 117).

[0058] like Figure 1 and Figure 3As shown, in some embodiments, the detection device 100 further includes a first seal 141 and a second seal 142. The first seal 141 is disposed around a first opening 1111, and the second seal 142 is disposed around a fourth opening 1122. By providing the first seal 141, the first cavity 111 can form a sealed first chamber 111a, and by providing the second seal 142, the second cavity 112 can form a sealed second chamber 112a.

[0059] In some embodiments, the first sealing member 141, the second sealing member 142, the first clamping member 1131, and the second clamping member 1132 are of the same shape and size, all being a U-shaped structure with a central opening. This is to ensure that the first surface 1211 and the second surface 1221 are adapted to the effective area of ​​the ion membrane 200, and that the first pressure application component 121 can enter the first cavity 111 to compress the ion membrane 200 or to form a sealed first chamber 111a, and that the second pressure application component 122 can enter the second cavity 112 to compress the ion membrane 200 or to form a sealed second chamber 112a. On the other hand, it is to ensure that the heights of the first opening 1111, the second opening 1112, the third opening 1121, and the fourth opening 1122 are consistent, and that the heights of the first cavity 111 and the second cavity 112 are consistent, thereby ensuring that the clamping force on the clamped ion membrane 200 is uniform.

[0060] like Figure 3As shown, in some embodiments, the detection device 100 further includes a third fastening device, a fourth fastening device, a second fastener 1411, and a third fastener 1421. The third fastening device includes a third sealing gasket 1412 and a third flange 1413, wherein the third sealing gasket 1412 and the third flange 1413 are arranged sequentially along the second direction F2. The fourth fastening device includes a fourth sealing gasket 1422 and a fourth flange 1423. The first cavity 111 further includes a third extension 1111b surrounding the first opening, and the second cavity 112 further includes a fourth extension 1122b surrounding the fourth opening. The third sealing gasket 1412 and the fourth flange 1423 are sequentially arranged along the first direction F1. The third sealing gasket 1412, the third extension 1111b, the third flange 1413, and the first sealing element 141 are tightly connected by the third fastener 1411. The fourth sealing gasket 1422, the fourth extension 1122b, the fourth flange 1423, and the second sealing element 142 are tightly connected by the fourth fastener 1421. By setting the third fastening device and the third fastener 1411, the first sealing element 141 and the first cavity 111 are fixedly connected. By setting the first extension 1111b, the first cavity 111 and the first sealing element 141 are better joined. By setting the fourth fastening device and the fourth fastener 1422, the second sealing element 142 and the second cavity 112 are fixedly connected. By setting the fourth extension 1122b, the second cavity 112 and the second sealing element 142 are better joined. By providing a tightly connected third sealing gasket 1412, third flange 1413 and first sealing element 141, gas or liquid leakage between the first sealing element 141 and the first cavity 111 is effectively prevented; by providing a fourth sealing gasket 1422, fourth flange 1423 and second sealing element 142, gas or liquid leakage between the second sealing element 142 and the second cavity 112 is effectively prevented.

[0061] In some embodiments, the first seal 141, the second seal 142, the first clamping member 1131, and the second clamping member 1132 are all made of steel, including 304 stainless steel or 6061-T6 aluminum alloy, so that the first seal 141, the second seal 142, the first clamping member 1131, and the second clamping member 1132 provide a certain rigid support for the first cavity 111 or the second cavity 112. In some embodiments, the first seal 141, the second seal 142, the first clamping member 1131, and the second clamping member 1132 may also be made of other materials.

[0062] like Figure 1 As shown, in some embodiments, the first pressure-applying component 121 and the second pressure-applying component 122 have the same structure, and the first pressure-applying component 121 and the second pressure-applying component 122 are symmetrically arranged on both sides of the ion membrane 200 so that the ion membrane 200 is subjected to uniform force.

[0063] Figure 4 A schematic diagram of the pressure application unit according to an embodiment of this application is shown. Figure 4 As shown, in some embodiments, the first pressure-applying component 121 includes a third groove and a third sealing ring 1212. The first pressure-applying component 121 includes a first end 121a and a second end 121b disposed opposite to each other. A first surface 1211 is disposed at the first end 121a. The third groove is disposed on the outer periphery of the first pressure-applying component 121 and between the first end 121a and the second end 121b. The third sealing ring 1212 is embedded in the third groove. When the first pressure-applying component 121 is located at the first detection position, the third sealing ring 1212 and the first cavity 111 are tightly connected, so that the first cavity 111, the ion membrane 200 and the first pressure-applying component 121 together form a sealed first cavity. Chamber 111a; The second pressure application component 122 includes a fourth groove and a fourth sealing ring 1222. The second pressure application component 122 includes a third end 122a and a fourth end 122b disposed opposite to each other. A second surface 1221 is disposed on the third end 122a. The fourth groove is disposed on the outer periphery of the second pressure application component 122 and between the third end 122a and the fourth end 122b. The fourth sealing ring 1222 is embedded in the fourth groove. When the second pressure application component 122 is located in the second detection position, the fourth sealing ring 1222 and the second chamber 112 are tightly connected so that the second chamber 112, the ion membrane 200 and the second pressure application component 122 together form a sealed second chamber 112a.

[0064] In the above embodiments, by providing a third sealing ring 1212, when the first pressure-applying component 121 is located in the first detection position, the third sealing ring 1212 and the first cavity 111 are tightly connected, so that the first cavity 111, the ion membrane 200, and the first pressure-applying component 121 together form a sealed first chamber 111a. By providing a fourth sealing ring 1222, when the second pressure-applying component 122 is located in the second detection position, the fourth sealing ring 1222 and the second cavity 112 are tightly connected, so that the second cavity 112, the ion membrane 200, and the second pressure-applying component 122 together form a sealed second chamber 112a. It should be understood that, since the ion membrane 200 has the characteristic of selectively passing ions, the sealing in the above embodiments refers to relative sealing. However, apart from the selectively passed ions, the first chamber 111a and the second chamber 121a are still independent sealed chambers.

[0065] In some embodiments, taking the second pressure-applying component 122 as an example, a structure other than the fourth sealing ring 1222 can also be used to enable the second pressure-applying component 122 to form a sealed second chamber 112a when it is located in the second detection position. This application does not impose specific limitations on this. In some embodiments, the first detection position can be any position within the first cavity 111 other than the first pressure-applying component 121 contacting the compressed ion membrane 200, including the position of the first pressure-applying component 121 when the third sealing ring 1212 is located in the first opening 1111. The second detection position can be any position within the second cavity 112 other than the second pressure-applying component 122 contacting the compressed ion membrane 200, including the position of the second pressure-applying component 122 when the fourth sealing ring 1222 is located in the fourth opening 1122.

[0066] In some embodiments, the materials of the first sealing ring 1141, the second sealing ring 1142, the third sealing ring 1212, the fourth sealing ring 1222, the first sealing gasket 1151, and the second sealing gasket 1161 all include fluororubber or EPDM.

[0067] like Figure 4 As shown, taking the second pressure application component 122 as an example, in some embodiments, the second pressure application component 122 includes a pressure plate 122c with a rigid structure. In some embodiments, the pressure plate 122c is made of a high-strength, high-modulus material, preferably carbon steel, alloy steel, or similar materials.

[0068] In some embodiments, a second surface 1221 is disposed on a pressure plate 122c, and the second surface 1221 is a flat surface to uniformly compress the ion exchange membrane 200. In some embodiments, the entire surface of the second surface 1221 is provided with electrode material, and the effective area of ​​the ion exchange membrane 200 is the same as the area of ​​the second surface 1221. It should be understood that in some embodiments, electrode material may also be partially deposited on the second surface 1221; however, the distribution of the electrode material deposited on the first surface 1211 and the second surface 1221 should be symmetrical about the ion exchange membrane 200 so that the ion exchange membrane 200 is symmetrically compressed.

[0069] like Figure 4As shown, taking the second pressure-applying component 122 as an example, in some embodiments, the second pressure-applying component 122 is provided with a flow field plate 1223 near the third end 122a. By providing the flow field plate 1223, the flow field plate on the electrode plate in the battery is simulated, thereby improving the accuracy of the electrode compression ratio test results. In some embodiments, the second pressure-applying component 122 is provided with a threaded hole for mounting the flow field plate 1223 near the third end 122a, and the flow field plate 1223 is fixed by screws 12231. In some embodiments, in order to simulate the stack structure while also possessing the mechanical strength of the electrode assembly, the flow field plate 1223 can be made of 304 stainless steel or 6061-T6 aluminum alloy to replace the graphite bipolar plate in the real stack structure. In some embodiments, the surface flow field of the flow field plate 1223 includes serpentine flow field, parallel flow field, interdigitated flow field, spiral flow field, grid flow field, etc.

[0070] In some embodiments, the side of the flow field plate 1223 with the flow field is a second surface 1221, and the electrode material is bonded to the second surface 1221 with adhesive. In some embodiments, the electrode material includes carbon felt, carbon cloth, carbon paper, etc., of different thicknesses. In some embodiments, the adhesive includes UV-curable adhesive, water-based self-adhesive, etc.

[0071] like Figure 1 As shown, in some embodiments, the detection device 100 further includes a base 150, on which the ion membrane clamping unit and the pressure application unit are both disposed. The base includes a graduated guide rail 151, and the pressure application unit is movably disposed on the guide rail 151. By setting the graduated guide rail 151 and movably disposing the pressure application unit on the guide rail 151, the positions of the pressure application unit, including the first detection position, the second detection position, the first compression position, and the second compression position, can be accurately recorded when the pressure application unit moves on the guide rail 151. Then, based on these recorded positions, the electrode compression ratio can be calculated to test whether the ion membrane 200 will fail under different electrode compression ratios.

[0072] In some embodiments, the base 150 is an aluminum alloy or steel structure, used to provide rigid support and mounting reference for the ion membrane clamping unit and the pressure application unit. In some embodiments, the guide rail 151 includes a micrometer-scale ruler for accurately measuring the displacement of the pressure application unit and calculating the electrode compression ratio.

[0073] like Figure 1 As shown, in some embodiments, the guide rail 151 is made of rigid material. The guide rail 151 includes a first linear guide rail 1511 and a second linear guide rail (not shown). The first linear guide rail 1511 and the second linear guide rail are symmetrically arranged along the length direction F3 perpendicular to the base 150. The first linear guide rail 1511 and / or the second linear guide rail includes a micrometer-level scale.

[0074] like Figure 1 As shown, in some embodiments, the first clamping member 1131 and the first sealing member 141 are connected to the first worktable 152 on the guide rail 151 through positioning pin holes, and the second clamping member 1131 and the second sealing member 142 are also connected to the second worktable 153 on the guide rail 151 through positioning pin holes. In some embodiments, the first worktable 152 and the second worktable 153 can slide along the guide rail for installation and removal. During ion membrane compression and failure detection, the first worktable 152 and the second worktable 153 are respectively fixedly connected to the base 150 by nuts.

[0075] In some embodiments, the first pressure-applying component 121 and the second pressure-applying component 122 each include a drive system. For example... Figure 1 As shown, taking the second pressure-applying component 122 as an example, the drive system also includes a lead screw 1224, a coupling 1225, and a motor 1226. One end of the lead screw 1224 is threadedly connected to the fourth end 122b of the second pressure-applying component, and the other end of the lead screw 1224 is connected to one end of the coupling 1225. The other end of the coupling 1225 is locked to the motor 1226 with a set screw. The bottom of the motor 1226 is provided with a positioning pin hole for connecting the motor 1226 to the base 150. By setting the motor 1226, lead screw 1224, and coupling 1225, the second pressure-applying component 122 can move on the guide rail 151. In some embodiments, the motor 1226 is locked onto the base 150 with screws. In some embodiments, the motor 1226 includes a stepper motor, a servo motor, etc.

[0076] In some embodiments, the first pressure-applying component 121 may employ the same drive system as the second pressure-applying component 122 to enable the first pressure-applying component 121 to move on the guide rail 151. In some embodiments, the drive system may also employ other designs to enable the first pressure-applying component 121 and the second pressure-applying component 122 to be movably mounted on the guide rail 151, and this application does not impose specific limitations on this.

[0077] like Figure 1As shown, in some embodiments, the liquid inlet unit 131 includes a first liquid inlet pipe 1311, a first liquid outlet pipe 1312, a second liquid inlet pipe 1313, and a second liquid outlet pipe 1314. The first cavity 111 includes a first liquid inlet 1113 and a first liquid outlet 1114. The first liquid inlet pipe 1311 is connected to the first liquid inlet 1113 for inputting a first solution into the first chamber 111a. The first liquid outlet pipe 1312 is connected to the first liquid outlet 1114 for outputting the first solution from the first chamber 111a. The second cavity 112 includes a second liquid inlet 1123 and a second liquid outlet 1124. The second liquid inlet pipe 1313 is connected to the second liquid inlet 1123 for inputting a first solution into the first chamber 111a. The second solution is input into the second chamber 112a, and the second outlet pipe 1314 is connected to the second outlet 1124 to allow the second solution to be output from the second chamber 112a. The conductivity of the first solution and the conductivity of the second solution are different. The failure detection unit also includes a conductivity detector 133. The first chamber 111 and / or the second chamber 112 are provided with a detector mounting port 1125 for mounting the conductivity detector 133 so that the conductivity detector 133 can detect the conductivity of the corresponding first solution and / or the conductivity of the corresponding second solution, and confirm whether the ion membrane 200 has failed based on any one of the conductivity change rates of the first solution and the conductivity change rates of the second solution. In the above embodiment, by setting the first liquid inlet pipe 1311 and the second liquid inlet pipe 1313, the first solution and the second solution with different conductivity can be independently input into the first chamber 111a and the second chamber 112a respectively. Combined with the detector mounting port 1125 and the conductivity detector 133, the conductivity detector 133 can monitor the conductivity changes of the first solution and / or the second solution in real time, thereby more accurately judging the failure status of the ion membrane 200.

[0078] In some embodiments, the conductivity value is used directly for failure determination. In other embodiments, the rate of change of conductivity is used for failure determination. Compared to the absolute value of the change in conductivity, detecting the rate of change of conductivity of the first and second solutions using a conductivity detector 133 better reflects the ion permeation situation and thus more accurately determines whether the ion exchange membrane 200 has failed.

[0079] In some embodiments, to ensure the accuracy of detecting ion exchange membrane 200 failure, the first solution and the second solution include ions that cannot easily pass through the ion exchange membrane 200. When the ion exchange membrane 200 fails, ions in the first solution or the second solution will interpenetrate, thereby changing the conductivity of the first solution or the second solution.

[0080] In some embodiments, the first solution comprises deionized water, and the second solution comprises a metal salt solution. In some embodiments, the first and second solutions may also be two solutions with different conductivities. In some embodiments, the metal salt solution comprises a sodium chloride solution with a concentration ranging from 0.2 to 1.0 M. In some embodiments, the theoretical osmotic pressure difference between the first and second solutions is 10 to 50 bar. For example, if the first solution is 0.5 M sodium chloride, then the second solution may be deionized water; if the first solution is 1.0 M potassium chloride solution, then the second solution may be 0.01 M potassium chloride solution. The metal salt solution includes sodium chloride solution, potassium chloride solution, calcium chloride solution, etc.

[0081] like Figure 1 As shown, in some embodiments, considering the gravity of the liquid itself, the first inlet 1113 is located above the first cavity 111, the second inlet 1123 is located above the second cavity 112, the first outlet 1114 is located below the first cavity 111, and the second outlet 1124 is located below the second cavity 112. This design improves the convenience of liquid inlet and outlet. By setting the first outlet pipe 1312 and the second outlet pipe 1314, the first solution and the second solution can be discharged from the first cavity 111a and the second cavity 112a respectively, forming a complete solution circulation path.

[0082] like Figure 1As shown, in some embodiments, the air intake unit 132 includes an air intake pipe 1321 and an air outlet pipe 1322. The first cavity 111 includes an air inlet 1115 and an air outlet 1116. The air intake pipe 1321 is connected to the air inlet 1115 for inputting gas into the first cavity 111a, and the air outlet pipe 1322 is connected to the air outlet 1116 for outputting gas from the first cavity 111a. The liquid inlet unit 131 includes a second liquid inlet pipe 1313 and a second liquid outlet pipe 1322. The liquid pipeline 1314 and the second chamber 112 include a second liquid inlet 1123 and a second liquid outlet 1124. The second liquid inlet pipeline 1313 is connected to the second liquid inlet 1123 and is used to input the third solution into the second chamber 112a. The second liquid outlet pipeline 1314 is connected to the second liquid outlet 1124 and is used to output the third solution from the second chamber 112a. The failure detection unit is used to confirm whether the ion membrane 200 has failed based on whether air bubbles appear in the second chamber 112a. By setting the gas inlet pipeline 1321 and the gas outlet pipeline 1322, gas can be stably input and discharged from the first chamber 111a, forming a gas circulation path and ensuring that the gas is in full contact with the ion membrane 200. A second inlet pipe 1313 and a second outlet pipe 1314 are provided to introduce a third solution into the second chamber 112a. Simultaneously, an inlet pipe 1321 connected to an inlet 1115 is provided to introduce gas into the first chamber 111a. This allows for observation of whether bubbles appear in the second chamber 112a, thus determining whether the ion exchange membrane 200 has failed. When the ion exchange membrane 200 suffers severe damage, including through-cracks (in which case the ion exchange membrane 200 has failed), gas will enter the second chamber 112a from the first chamber 111a through leaks in the ion exchange membrane 200, thereby forming bubbles.

[0083] In some embodiments, the presence of air bubbles in the second chamber 112a can be determined by visual observation or by using a camera combined with image recognition. In some embodiments, to facilitate observation of air bubbles, both the first chamber 111 and the second chamber 112 are made of transparent material. In some embodiments, the materials of the first chamber 111 and the second chamber 112 include acrylic material or pressure-resistant glass material, and the wall thickness of the first chamber 111 and the wall thickness of the second chamber 112 can be set to 0.5~2.0 cm.

[0084] In some embodiments, gas may be introduced into the second chamber 112a while liquid is introduced into the first chamber 112a, and the presence or absence of bubbles in the first chamber 112a can be observed. In some embodiments, the third solution may be deionized water, or other solutions that facilitate bubble observation. The gas may be nitrogen or other inert gases that do not pollute the environment; this application does not impose specific limitations on these. In some embodiments, the pressure range of the inert gas introduced into the first chamber 11a is 0.20~0.50 MPa.

[0085] In some embodiments, in order to observe the gas, a non-toxic colored gas may be introduced into either the first chamber 111a or the second chamber 112a, while no liquid is injected into the other chamber, and the presence of colored gas in the other chamber may be observed.

[0086] In some embodiments, the air inlet 1115, the air outlet 1116, the detector mounting port 1125, the first liquid inlet 1113, the first liquid outlet 1114, the second liquid inlet 1123, and the second liquid outlet 1124 all include threaded holes to facilitate tight connection with the failure detection unit.

[0087] In some embodiments, the conductivity meter 133 is inserted into the meter mounting port 1125 in the form of a threaded hole. The meter mounting port 1125 includes a sealing threaded adapter (including an O-ring) for fixing the conductivity meter 133. The sealing threaded adapter is externally connected to a stainless steel ferrule nut to prevent loosening.

[0088] like Figure 1 As shown, in some embodiments, the air intake unit 132 includes a gas cylinder 1323. One end of the air intake pipe 1321 is connected to the gas cylinder 1323, passes through a first one-way valve S1 and a gas pressure gauge 1324, and then connects to the first cavity 111 through an air inlet 1115. The air outlet pipe 1322 extends from the air outlet 1116 and is discharged into the environment after passing through a second one-way valve S2. The first liquid inlet pipe 1311 is connected to the first liquid tank 1315, passes through a third one-way valve S3, and then connects to the first cavity 111 through a first liquid inlet 1113. The first liquid outlet pipe 1312 extends from the first liquid outlet 1114, passes through a fourth one-way valve S4, and enters the first waste liquid tank 1316. The second liquid inlet pipe 1313 is connected to the second liquid tank 1317, passes through a fifth one-way valve S5, and then connects to the second cavity 112 through a second liquid inlet 1123. The second liquid outlet pipe 1314 is led out from the second liquid outlet 1124, and enters the second waste liquid tank 1318 after passing through the sixth one-way valve S6.

[0089] In some embodiments, the above-mentioned pipelines may be selected from PTFE pipes, PU pipes, PVC pipes, etc.

[0090] This application also proposes a method for detecting ion membrane compression failure performed by the detection device 100 described above.

[0091] Figure 5 A flowchart of an embodiment of the ion-exchange membrane compression failure detection method of this application is shown. Figure 5 As shown, the ion membrane compression failure detection method proposed in this application is executed by the detection device 100 described above, and includes:

[0092] Step S1110: Clamp the ion exchange membrane with the clamping element;

[0093] Step S1120: Drive the first pressure application component to enter the first cavity from the first opening and reach the first compression position, and drive the second pressure application component to enter the second cavity from the fourth opening and reach the second compression position, so that the second pressure application component and the first pressure application component jointly compress the ion membrane;

[0094] Step S1130: After the time for which the second pressure component and the first pressure component jointly compress the ion membrane reaches the first preset time, drive the first pressure component to move to the first detection position, and drive the second pressure component to move to the second detection position.

[0095] Step S1140: Control the liquid inlet unit to input liquid into the first chamber and / or the second chamber, and the failure detection unit detects whether the compressed ion membrane has failed based on the conductivity of the liquid, and / or control the gas inlet unit to input gas into the first chamber, and the failure detection unit detects whether the compressed ion membrane has failed based on the air bubbles in the second chamber.

[0096] In the above embodiments, by setting step S1110, the ion membrane to be tested can be stably fixed, ensuring that it does not shift or loosen during the testing process, thereby improving the accuracy of the test. By setting step S1120, the stress situation of the electrode compressing the ion membrane in an actual battery is simulated. By setting steps S1130 and S1140, the stability of the ion membrane under pressure conditions for a first preset time is tested after it has undergone continuous compressive stress. By using conductivity detection and / or bubble detection, the failure of the ion membrane after pressure is accurately detected.

[0097] In some embodiments, step S1110 includes: fixing a first cavity 111 on a first worktable 152 and a second cavity 112 on a second worktable 153, and fixing a pressure application unit on a base 150. The ion exchange membrane 200 to be tested is placed between the first clamping member 1131 and the second clamping member 1132, the first fastener 117 is tightened, and the first seal 141 and the second seal 142 are installed.

[0098] In some embodiments, before step S1120, the method further includes: connecting the first chamber 111a to the outside atmosphere, and / or connecting the second chamber 112a to the outside atmosphere. At this time, neither the first chamber 111a nor the second chamber 112a is filled with liquid; both are empty cavities. In some embodiments, the venting unit includes the aforementioned vent 1116, the second one-way valve S2, and the venting pipe 1322. The first chamber 111a can be connected to the outside atmosphere by opening the second one-way valve S2. In some embodiments, the liquid discharging unit includes the aforementioned first liquid discharging port 1114, the first liquid discharging pipe 1312, the second liquid discharging port 1124, and the second liquid discharging pipe 1314. The second chamber 112a can be connected to the outside atmosphere by opening the fourth one-way valve S4 and the sixth one-way valve S6. By connecting the first chamber 111a to the outside atmosphere, and / or connecting the second chamber 112a to the outside atmosphere, the pressure in the first chamber 111a and the second chamber 112a remains consistent with the atmospheric pressure during the movement of the pressurizing unit. This reduces the resistance during the movement of the pressurizing unit and allows it to reach the ion membrane 200 smoothly.

[0099] In some embodiments, step S1120 further includes: during the process of driving the first pressure-applying component 121 from the first opening 1111 into the first cavity 111a and reaching the first compression position, recording the first contact position when the first pressure-applying component 121 just contacts the ion membrane 200; during the process of driving the second pressure-applying component 122 from the fourth opening 1122 into the second cavity 112a and reaching the second compression position, recording the second contact position when the second pressure-applying component 122 just contacts the ion membrane 200; obtaining the electrode compression ratio corresponding to the failure of the ion membrane 200 based on the current first compression position and the current second compression position, including: calculating the electrode compression ratio C2 using either of the following formulas (1) and (2):

[0100] C2=|D1-D2| / D0×100%(1)

[0101] C2=|D3-D4| / D0×100%(2)

[0102] Where D0 is the original thickness of the electrode material, D1 is the first contact position, D2 is the current first compression position, D3 is the second contact position, and D4 is the current second compression position. By recording the first contact position and the second contact position, the first compression position and the second compression position, the contact position and compression position of the pressure application unit can be accurately calibrated according to formula (1) or formula (2), and the electrode compression ratio of the ion membrane 200 can be accurately calculated.

[0103] In the above embodiments, the first contact position is defined as the position when the first pressure-applying component 121 just contacts the ion membrane 200, that is, when the electrode material on the first surface 1211 just contacts the ion membrane 200 without compressing it. Similarly, the second contact position is defined as the position when the second pressure-applying component 122 just contacts the ion membrane 200, that is, when the electrode material on the second surface 1221 just contacts the ion membrane 200 without compressing it. In the above embodiments, the original thickness of the electrode material is the thickness of the electrode material on the first surface 1211 or the electrode material on the second surface 1221 before compressing the ion membrane 200. In some embodiments, the first contact position and the second contact position are recorded by recording the first scale on the guide rail 151 when the first pressure-applying component 121 just contacts the ion membrane 200 and the second scale on the guide rail 151 when the second pressure-applying component 122 just contacts the ion membrane 200. The first compression position and the second compression position are recorded by recording the third scale on the guide rail 151 when the first pressure application component 121 is in the first compression position and the fourth scale on the guide rail 151 when the second pressure application component 122 is in the second compression position.

[0104] In some embodiments, the first scale refers to the scale value of the guide rail 151 corresponding to the first surface 1211 of the first pressure-applying component 121 when it is in the first detection position, and the third scale refers to the scale value of the guide rail 151 corresponding to the first surface 1211 of the first pressure-applying component 121 when it is in the first compression position. Similarly, the recorded second and fourth scales also refer to the scale values ​​of the guide rail 151 corresponding to the second surface 1221 of the second pressure-applying component 122.

[0105] In some embodiments, the first preset time in step S1130 can be set according to actual needs. In some embodiments, the first preset time can be set to 6-8 hours.

[0106] In some embodiments, before step S1140, the method further includes: detecting the airtightness of the first chamber 111a when the first pressure application component 121 is in the first detection position; and detecting the airtightness of the second chamber 112a when the second pressure application component 122 is in the second detection position. By detecting the airtightness of the first chamber 111a when the first pressure application component 121 is in the first detection position, and detecting the airtightness of the second chamber 112a when the second pressure application component 122 is in the second detection position, distortion of the ion membrane failure detection results due to chamber sealing problems is avoided.

[0107] In some embodiments, the airtightness test employs the same method as the ion membrane failure test, including: observing whether bubbles are generated on the side of the ion membrane 200 to be tested located in the first chamber 111a or the second chamber 112a, and / or testing whether there is a drastic change in the conductivity of the solution in the first chamber 111a or the second chamber 112a. The airtightness test also includes: observing whether there is liquid leakage or air leakage in the first chamber 111a or the second chamber 112a, thereby determining whether the airtightness of the detection device 100 is good. If the ion membrane 200 to be tested is damaged, a new ion membrane is replaced; if the airtightness of the detection device 100 is poor, the leakage points of the detection device 100 are sealed and tightened.

[0108] In some embodiments, the liquid inlet unit in step S1140 inputs liquid into the first chamber and / or the second chamber, and the failure detection unit detects whether the compressed ion membrane has failed based on the conductivity of the liquid, including: controlling the liquid inlet unit 131 to introduce a first solution into the first chamber 111a and a second solution into the second chamber 112a, wherein the first solution has a first conductivity and the second solution has a second conductivity, and the first conductivity and the second conductivity are different; after a second preset time, using a conductivity detector 133 to detect the first conductivity of the first solution in the first chamber 111a and / or the second conductivity of the second solution in the second chamber 112a; and determining that the ion membrane has failed in response to the rate of change of the first conductivity being within a first preset range and / or the rate of change of the second conductivity being within a second preset range. A first solution is introduced into the first chamber 111a and a second solution into the second chamber 112a via the liquid inlet unit 131. Combined with the conductivity detector 133 measuring the rate of change of the first or second conductivity after a second preset time, it is possible to quantitatively analyze whether the ion exchange membrane 200 has failed. The electrode compression ratio at which the ion exchange membrane 200 fails is used as the failure threshold for the electrode compression ratio. By setting a first preset range for the rate of change of the first conductivity and a second preset range for the rate of change of the second conductivity, the failure threshold for the electrode compression ratio at which the ion exchange membrane 200 fails can be accurately determined, thereby obtaining a safe electrode compression ratio range for the ion exchange membrane 200.

[0109] In some embodiments, the second preset time can be set according to the difference between the first conductivity and the second conductivity. For example, when the difference between the first conductivity and the second conductivity is large, the second preset time can be set to a shorter time.

[0110] In some embodiments, the control air intake unit in step S1140 inputs gas into the first chamber, and the failure detection unit detects whether the compressed ion membrane has failed based on the bubbles in the second chamber, including: controlling the air intake unit 132 to introduce a first gas into the first chamber 111a, and controlling the liquid intake unit 131 to introduce a third solution into the second chamber 112a; and the ion membrane 200 fails in response to the appearance of bubbles in the second chamber 112a.

[0111] The first gas is introduced into the first chamber 111a through the air intake unit 132, and the third solution is introduced into the second chamber 112a. The presence of bubbles in the second chamber 112a is observed to qualitatively determine whether the ion membrane 200 has failed.

[0112] In some embodiments, the third solution comprises deionized water.

[0113] In some embodiments, since the ion membrane itself does not allow gas to pass through, the location of the ion membrane 200 damage can be determined based on the location where the bubble is generated, and the degree of damage to the ion membrane 200 can be preliminarily determined based on the size of the bubble generated.

[0114] In some embodiments, qualitative bubble detection can be performed first to confirm whether the ion exchange membrane has failed. If bubbles are present, the ion exchange membrane is damaged and has failed, and subsequent conductivity testing is unnecessary. If no bubbles are present, the degree of failure of the ion exchange membrane 200 can be quantified through subsequent quantitative conductivity testing.

[0115] In some embodiments, the failure detection unit in step S1140 detects whether the compressed ion membrane has failed based on the bubbles in the second chamber by: closing the second one-way valve S2, the third one-way valve S3, and the fourth one-way valve S4; opening the first one-way valve S1 on the inlet pipe 1321 to introduce inert gas at a certain pressure into the first chamber 111a; closing the sixth one-way valve S6; opening the fifth one-way valve S5 on the second liquid inlet pipe 1313 to fill the second chamber 112a with deionized water solution; and observing whether bubbles are generated on the side of the ion membrane 200 near the second chamber 112a. If bubbles are generated, it is the leakage point of the ion membrane 200.

[0116] In some embodiments, the conductivity quantitative detection method is performed immediately after the bubble qualitative detection method, and the steps include: opening the second one-way valve S2 of the gas outlet pipe 1322 to discharge the inert gas in the first chamber 111a until the reading of the gas pressure gauge 1324 is consistent with the atmospheric pressure; opening the sixth one-way valve S6 of the second liquid outlet pipe 1314 to discharge the deionized aqueous solution in the second chamber 112a; closing the second one-way valve S2 of the gas outlet pipe 1322; opening the third one-way valve S3 on the first liquid inlet pipe 1311 to fill the first chamber 111a with a certain concentration of metal salt solution through the first liquid inlet pipe 1311; closing the sixth one-way valve S6 on the second liquid outlet pipe 1314; opening the fifth one-way valve S5 on the second liquid inlet pipe 1313 to fill the second chamber 112a with deionized aqueous solution through the second liquid inlet pipe 1313; and allowing it to stand for a period of time (2~6 minutes). h) To allow the solution to fully permeate both sides of the ion exchange membrane 200, the conductivity of the solution in the first chamber 111a or the solution in the second chamber 112a is detected using a conductivity meter 133.

[0117] In some embodiments, the detection method further includes: cyclically executing steps S1120-S1140, and changing the first compression position and the second compression position each time step S1130 is executed; when failure of the compressed ion membrane is detected in step S1140, the cycle is stopped, and the electrode compression ratio corresponding to the failure of the ion membrane is obtained according to the current first compression position and the second compression position, wherein the electrode compression ratio is the ratio of the electrode material compressed by the pressure application unit. By changing the first compression position and the second compression position, the electrode compression ratio is continuously changed, and the failure of the ion membrane is tested to obtain the electrode compression ratio at which the ion membrane fails (i.e., the threshold of electrode compression ratio failure), providing experimental basis for setting the electrode compression ratio of actual battery systems.

[0118] In some embodiments, the above embodiments include: turning on the drive system, controlling the first pressure application component 121 and the second pressure application component 122 to advance towards the ion membrane 200 until the pressure plate of the pressure application unit enters the first cavity / second cavity (the width of the pressure plate entering the cavity is approximately a few millimeters) to achieve a sealing effect, that is, the first detection position or the second detection position, stopping the drive system, at which time the scale of the drive unit (first pressure application component 121 or second pressure application component 122) on the guide rail is recorded as D00; in the current state, the original state of the ion membrane 200 before the experiment and the airtightness of the detection device 100 are detected; turning on the drive system, controlling the pressure application unit to continue to maintain the forward displacement until the electrode material just contacts the ion membrane 200, at which time the first scale where the first pressure application component 121 is located and the second scale where the second pressure application component 122 is located are recorded, and the electrode compression ratio is recorded as C1 (unpressed state, that is, the electrode compression ratio is 0). Then, the pressure unit continues to advance towards the ion exchange membrane 200 to compress it until the first pressure component 121 reaches the third scale and the second pressure component 122 reaches the fourth scale. Compression then stops, maintaining the compression state for a first preset duration, and returns to the scale D00 position (partly to ensure sufficient visibility for observation, and partly because a sealing test of the device was performed at D00, ensuring the sealing of device 100). In this state, ion exchange membrane failure detection is performed to determine if the current electrode compression ratio is safe. If the detection result shows that the electrode compression ratio is within the safe threshold, the above operation is repeated, recording the third scale of the first pressure component 121 and the fourth scale of the second pressure component 122 under different electrode compression ratios. After each compression, the ion exchange membrane is checked for failure based on bubble detection results and / or conductivity data, ultimately obtaining the safe range of the electrode compression ratio.

[0119] In some embodiments, in order to simulate a long-term pressure state, the pressure unit compresses the ion membrane and maintains it for a first preset duration of 2 to 12 hours.

[0120] In some embodiments, when measuring the failure threshold of the electrode compression ratio, the ion membrane is compressed by changing the first compression position and the second compression position according to the electrode compression ratio from small to large, and then the ion membrane is tested to see if failure occurs.

[0121] Figure 6 A schematic diagram of the electrode compression ratio-conductivity curve according to an embodiment of this application is shown. Figure 6 As shown, the horizontal axis of the curve represents the electrode compression ratio (in %), and the vertical axis represents the conductivity (in μs / cm).

[0122] exist Figure 6In the illustrated embodiment, data on the conductivity of the deionized aqueous solution in the second chamber 112a under different electrode compression ratios are obtained, and an electrode compression ratio-conductivity curve is established. The origin of the curve is the conductivity value of the deionized aqueous solution in the second chamber 112a measured by the conductivity meter 133 when the ion exchange membrane is not under pressure. Ideally, the conductivity at the origin is 0.

[0123] exist Figure 6 In the illustrated embodiment, an interdigitated flow field plate is used as the flow field plate. Carbon felt electrode material is adhered to the flow field side of the flow field plate using water-based adhesive. The electrode material has an area of ​​5 cm × 5 cm and a measured thickness D0 of 2.55 mm. The ion exchange membrane 200 is a perfluorosulfonic acid membrane with an area of ​​5.2 cm × 5.2 cm.

[0124] exist Figure 6 In the illustrated embodiment, the experimenter first clamps the ion exchange membrane and installs the detection device 100, turns on the drive system, and controls the pressure plate of the first pressure component 121 to precisely enter the first cavity 111 (first detection position) to form a sealed first chamber 111a. The pressure plate 122c of the second pressure component 122 precisely enters the second cavity 112 (second detection position) to form a sealed second chamber 112a. At this time, since two scales symmetrically parallel about direction F3 are used, the scale D00 of both the first and second detection positions is 17.20 mm. Then, the following steps are performed: At this position, a failure detection method is used to first detect the original state of the ion exchange membrane 200 and the airtightness of the detection device 100. It is observed that no air bubbles appear on the side of the ion exchange membrane 200 near the deionized water in the second chamber 112a. At this time, the conductivity of the deionized water is detected as 10 μS / cm. The detection device 100 has no leakage of liquid or air, and its airtightness is good.

[0125] Then, the motor is turned on. When the carbon felt electrode just touches the plane of the ion membrane 200, the motor is stopped. At this time, the first scale of the first pressure component 121 and the second scale of the second pressure component 122 are both 14.5 mm on the guide rail. At this time, the electrode compression ratio is 0.

[0126] Then, the motor is turned on, causing the carbon felt electrode to begin compressing the ion membrane 200. Compression stops when the third scale of the first pressure component 121 and the fourth scale of the second pressure component 122 are both 14.3 mm. The current electrode compression ratio is 8%. This compression state is maintained for 6 hours, and then the compression is reduced to the scale of 17.20 mm.

[0127] The failure detection method was used to test the ion exchange membrane 200: nitrogen gas at 0.20 MPa was introduced into the first chamber 111a, and deionized water was introduced into the second chamber 112a. It was observed that no bubbles appeared on the side of the second chamber 112a near the ion exchange membrane 200. A 0.5 M sodium chloride solution was introduced into the first chamber 111a, and after standing for 4 hours, the conductivity of the solution in the second chamber 112a was measured to be 15 μS / cm.

[0128] After draining the deionized water and sodium chloride solution from both chambers, the motor is turned on, and the carbon felt electrode further compresses the ion membrane 200. Compression stops when the third scale of the first pressure component 121 and the fourth scale of the second pressure component 122 are both 14.0 mm. The current electrode compression ratio is 20%. This compression state is maintained for 6 hours, and then the pressure is reduced to 17.20 mm.

[0129] The failure detection method was used to test the ion membrane 200: no bubbles were observed on the side of the second chamber 112a near the ion membrane 200; 0.5M sodium chloride solution was introduced into the first chamber 111a, and after standing for 4 hours, the conductivity value was 25 μS / cm.

[0130] Repeated compression and failure testing yielded the following data: Compression was stopped when the third scale of the first pressure component 121 and the fourth scale of the second pressure component 122 both reached 13.8 mm. The current electrode compression ratio was 27%. No obvious bubbles were observed on the side of the ion membrane near the deionized water chamber. After standing for 4 hours, the conductivity was measured at 32 μS / cm. Compression was stopped when the third scale of the first pressure component 121 and the fourth scale of the second pressure component 122 both reached 13.5 mm. The current electrode compression ratio was 39%. No obvious bubbles were observed on the side of the ion membrane near the deionized water chamber. After standing for 4 hours, the conductivity was measured at 45 μS / cm. Compression was stopped when the third scale of the first pressure component 121 and the fourth scale of the second pressure component 122 both reached 13.2 mm. The current electrode compression ratio was 51%. Small bubbles were observed on the side of the ion membrane near the deionized water chamber. After standing for 4 hours, the conductivity was measured at 65 μS / cm. Compression stopped when the third scale of the first pressure-applying component 121 and the fourth scale of the second pressure-applying component 122 both reached 12.9 mm. The current electrode compression ratio was 63%. Obvious bubbles were observed on the side of the ion membrane near the deionized water chamber. After standing for 4 hours, the conductivity value was 95 μS / cm. Compression stopped when the third scale of the first pressure-applying component 121 and the fourth scale of the second pressure-applying component 122 both reached 12.6 mm. The current electrode compression ratio was 75%. Obvious bubbles were observed on the side of the ion membrane near the deionized water chamber. After standing for 4 hours, the conductivity value was 185 μS / cm.

[0131] Stop the experiment and plot the data based on the above data. Figure 6 The schematic diagram of the electrode compression ratio-conductivity curve is shown below. Figure 6 As shown, at the electrode compression ratio corresponding to point A, and on the electrode compression ratio-conductivity curve, the slope value between adjacent points A and B is >2.5, indicating a sudden change in the rate of change of the solution's conductivity (i.e., the curve slope). The ion membrane compression ratio corresponding to point A is the critical failure point. Similarly, when detecting bubbles in ion membrane 200 at the electrode compression ratio corresponding to point A, obvious bubbles also appeared near ion membrane 200. From this curve, the safe range of the electrode compression ratio is 0-60%.

[0132] The detection device proposed in this application accurately simulates the structural characteristics of key internal components (bipolar plates, electrodes, and ion membranes) and the stress state of the ion membrane by setting up a pressure application unit and an ion membrane clamping unit. This enables the visualization of multi-interface contact behavior. By moving the pressure application unit on a graduated guide rail, the stress effect of the electrode material on the ion membrane under different electrode compression ratios can be accurately simulated. This application also includes a failure detection unit. On the one hand, bubble detection enables qualitative detection of whether the ion membrane has been damaged. On the other hand, a conductivity meter enables online leak detection, i.e., real-time monitoring of the integrity of the ion membrane after compression, thereby establishing a quantitative relationship between the electrode compression ratio parameter and the risk of ion membrane failure. This application also proposes a detection method executed by the above-mentioned detection device. This method detects whether the ion membrane fails under different electrode compression ratios and can obtain the electrode compression ratio threshold for ion membrane failure, providing experimental support for setting the electrode compression ratio in actual batteries. The detection device and method of this application overcome the limitations of existing technologies that rely on trial and error to set the electrode compression ratio, providing a scientific and quantitative standard for optimizing the fuel cell assembly process.

[0133] The basic concepts have been described above. Obviously, for those skilled in the art, the above disclosure is merely illustrative and does not constitute a limitation of this application. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements, and corrections to this application. Such modifications, improvements, and corrections are suggested in this application, and therefore remain within the spirit and scope of the exemplary embodiments of this application.

[0134] Furthermore, this application uses specific terms to describe embodiments of the application. For example, "an embodiment," "one embodiment," and / or "some embodiments" refer to a particular feature, structure, or characteristic related to at least one embodiment of the application. Therefore, it should be emphasized and noted that "an embodiment," "one embodiment," or "an alternative embodiment" mentioned twice or more in different locations in this specification do not necessarily refer to the same embodiment. In addition, certain features, structures, or characteristics in one or more embodiments of the application can be appropriately combined.

[0135] In some embodiments, numbers describing the quantity of components and attributes are used. It should be understood that such numbers used in the description of embodiments are modified in some examples with the terms "approximately," "approximately," or "generally." Unless otherwise stated, "approximately," "approximately," or "generally" indicates that the numbers are allowed to vary by ±20%. Accordingly, in some embodiments, the numerical parameters used in the specification are approximate values, which may be changed according to the characteristics required by individual embodiments. In some embodiments, numerical parameters should take into account specified significant digits and employ a general method of digit reservation. Although the numerical ranges and parameters used to confirm their breadth of range in some embodiments of this application are approximate values, in specific embodiments, such numerical values ​​are set as precisely as feasible.

Claims

1. A detection device for ion membrane compression failure, characterized in that, include: An ion membrane clamping unit includes a first cavity, a second cavity, and a clamping member. The first cavity has a first opening and a second opening that are disposed opposite to each other. The second cavity has a third opening and a fourth opening that are disposed opposite to each other. The clamping member is disposed between the second opening and the third opening and is used to clamp the ion membrane to be tested. The pressure application unit includes a movable first pressure application component and a movable second pressure application component. The first pressure application component has a first surface facing the ion exchange membrane, and the second pressure application component has a second surface facing the ion exchange membrane. Electrode material is disposed on both the first and second surfaces. The first and second pressure application components are used to jointly compress the ion exchange membrane. The first pressure-applying component is configured to enter the first cavity from the first opening and move between a first compression position and a first detection position, wherein the first compression position is the position of the first pressure-applying component when the electrode material of the first surface contacts and compresses the ion membrane, and when the first pressure-applying component is located at the first detection position, the first cavity, the ion membrane and the first pressure-applying component together form a sealed first chamber; The second pressure-applying component is configured to enter the second cavity through the fourth opening and move between a second compression position and a second detection position, wherein the second compression position is the position of the second pressure-applying component when the electrode material of the second surface contacts and compresses the ion membrane, and when the second pressure-applying component is located at the second detection position, the second cavity, the ion membrane, and the second pressure-applying component together form a sealed second chamber; The failure detection unit includes a liquid inlet unit and / or an air inlet unit. The liquid inlet unit is used to input liquid into the first chamber and / or the second chamber, and the air inlet unit is used to input gas into the first chamber. The failure detection unit is used to detect whether the compressed ion membrane has failed based on the conductivity of the liquid and / or based on the air bubbles in the second chamber.

2. The detection device as described in claim 1, characterized in that, The clamping member includes a first clamping member and a second clamping member. The first clamping member is disposed around the second opening, and the second clamping member is disposed around the third opening. The first clamping member and the second clamping member are used to jointly clamp the ion membrane.

3. The detection device as described in claim 1, characterized in that, It also includes a first seal and a second seal, the first seal being disposed around the first opening and the second seal being disposed around the fourth opening.

4. The detection device as described in claim 2, characterized in that, The first clamping member includes a first side and a second side disposed opposite to each other, wherein the first side is close to the ion membrane and has a first groove. The second clamping member includes a third side and a fourth side disposed opposite to each other, wherein the third side is close to the ion membrane and has a second groove. The ion membrane clamping unit further includes a first sealing ring and a second sealing ring, wherein the first sealing ring is embedded in the first groove and the second sealing ring is embedded in the second groove, and the first sealing ring and the second sealing ring are respectively used to be tightly connected with the ion membrane.

5. The detection device as described in claim 4, characterized in that, The ion membrane clamping unit further includes a first fastening device, a second fastening device, and a first fastener. The first fastening device includes a first sealing gasket and a first flange, wherein the first sealing gasket and the first flange are arranged sequentially along a first direction away from the second side. The second fastening device includes a second sealing gasket and a second flange, wherein the second sealing gasket and the second flange are arranged sequentially along a second direction away from the fourth side. The first cavity further includes a first extension surrounding the second opening, and the second cavity further includes a second extension surrounding the third opening. The first fastener is used to tightly connect the first flange, the first extension, the first sealing gasket, the first clamping member, the second clamping member, the second sealing gasket, the second extension, and the second flange.

6. The detection device as described in claim 1, characterized in that, The first pressure-applying component includes a third groove and a third sealing ring. The first pressure-applying component includes a first end and a second end disposed opposite to each other. A first surface is disposed at the first end. The third groove is disposed on the outer periphery of the first pressure-applying component and between the first end and the second end. The third sealing ring is embedded in the third groove. When the first pressure-applying component is located at the first detection position, the third sealing ring and the first cavity are tightly connected, so that the first cavity, the ion membrane, and the first pressure-applying component together form a sealed first chamber. The second pressure-applying component includes a fourth groove and a fourth sealing ring. The second pressure-applying component includes a third end and a fourth end disposed opposite to each other. A second surface is disposed at the third end. The fourth groove is disposed on the outer periphery of the second pressure-applying component and between the third end and the fourth end. The fourth sealing ring is embedded in the fourth groove. When the second pressure-applying component is located at the second detection position, the fourth sealing ring and the second cavity are tightly connected, so that the second cavity, the ion membrane, and the second pressure-applying component together form a sealed second chamber.

7. The detection device as described in claim 1, characterized in that, The liquid inlet unit includes a first liquid inlet pipe, a first liquid outlet pipe, a second liquid inlet pipe, and a second liquid outlet pipe. The first cavity includes a first liquid inlet and a first liquid outlet. The first liquid inlet pipe is connected to the first liquid inlet and is used to input a first solution into the first cavity. The first liquid outlet pipe is connected to the first liquid outlet and is used to output the first solution from the first cavity. The second cavity includes a second liquid inlet and a second liquid outlet. The second liquid inlet pipe is connected to the second liquid inlet and is used to input a second solution into the second cavity. The second liquid outlet pipe is connected to the second liquid outlet and is used to output the second solution from the second cavity. The conductivity of the first solution is different from that of the second solution; The failure detection unit further includes a conductivity meter. The first cavity and / or the second cavity are provided with a detector mounting port. The detector mounting port is used to install the conductivity meter so that the conductivity meter can detect the conductivity of the corresponding first solution and / or the conductivity of the corresponding second solution, and confirm whether the ion membrane has failed based on the rate of change of conductivity of the first solution and / or the rate of change of conductivity of the second solution.

8. The detection device according to claim 7, characterized in that, The first solution comprises deionized water, and the second solution comprises a metal salt solution.

9. The detection device as described in claim 1, characterized in that, The air intake unit includes an air intake pipe and an air outlet pipe. The first cavity includes an air inlet and an air outlet. The air intake pipe is connected to the air inlet and is used to input gas into the first cavity. The air outlet pipe is connected to the air outlet and is used to output the gas from the first cavity to the outside. The liquid inlet unit includes a second liquid inlet pipe and a second liquid outlet pipe. The second cavity includes a second liquid inlet and a second liquid outlet. The second liquid inlet pipe is connected to the second liquid inlet and is used to input a third solution into the second cavity. The second liquid outlet pipe is connected to the second liquid outlet and is used to output the third solution from the second cavity to the outside. The failure detection unit is used to confirm whether the ion membrane has failed based on whether air bubbles appear in the second chamber.

10. The detection device as described in claim 1, characterized in that, It also includes a base, on which both the ion membrane clamping unit and the pressure applying unit are disposed. The base includes a graduated guide rail, and the pressure applying unit is movably disposed on the guide rail.

11. A method for detecting compression failure of an ion-exchange membrane, performed by the detection device according to any one of claims 1-10, characterized in that, include: Step S1110: Clamp the ion exchange membrane with the clamping member; Step S1120: Drive the first pressure application component from the first opening into the first cavity and reach the first compression position, drive the second pressure application component from the fourth opening into the second cavity and reach the second compression position, so that the second pressure application component and the first pressure application component jointly compress the ion membrane; Step S1130: After the second pressure component and the first pressure component jointly compress the ion membrane for a first preset time, drive the first pressure component to move to the first detection position, and drive the second pressure component to move to the second detection position; as well as Step S1140: Control the liquid inlet unit to input liquid into the first chamber and / or the second chamber, and the failure detection unit detects whether the compressed ion membrane has failed based on the conductivity of the liquid, and / or control the gas inlet unit to input gas into the first chamber, and the failure detection unit detects whether the compressed ion membrane has failed based on the air bubbles in the second chamber.

12. The method as described in claim 11, characterized in that, Also includes: Steps S1120-S1140 are executed repeatedly, and the first compression position and the second compression position are changed each time step S1130 is executed; In response to the detection of failure of the compressed ion membrane in step S1140, the cycle is stopped, and the electrode compression ratio corresponding to the failure of the ion membrane is obtained according to the current first compression position and second compression position, wherein the electrode compression ratio is the ratio of the electrode material compressed by the pressure application unit.

13. The method as described in claim 11 or 12, characterized in that, Before step S1120, the method further includes: connecting the first chamber to the outside atmosphere, and / or connecting the second chamber to the outside atmosphere.

14. The method as described in claim 12, characterized in that, Step S1120 further includes: during the process of driving the first pressure-applying component to enter the first cavity from the first opening and reach the first compression position, recording the first contact position when the first pressure-applying component just contacts the ion membrane; during the process of driving the second pressure-applying component to enter the second cavity from the fourth opening and reach the second compression position, recording the second contact position when the second pressure-applying component just contacts the ion membrane; Obtaining the electrode compression ratio corresponding to the failure of the ion membrane based on the current first and second compression positions includes calculating the electrode compression ratio C2 using any of the following formulas: C2 = |D1 - D2| / D0 × 100% C2 = |D3-D4| / D0×100% Wherein, D0 is the original thickness of the electrode material, D1 is the first contact position, D2 is the current first compression position, D3 is the second contact position, and D4 is the current second compression position.

15. The method as described in claim 11, characterized in that, In step S1140, controlling the liquid inlet unit to input liquid into the first chamber and / or the second chamber, and the failure detection unit detecting whether the compressed ion membrane has failed based on the conductivity of the liquid, includes: The liquid inlet unit is controlled to introduce a first solution into the first chamber and a second solution into the second chamber, wherein the first solution has a first conductivity and the second solution has a second conductivity, and the first conductivity and the second conductivity are different; After a second preset time, the first conductivity of the first solution in the first chamber and / or the second conductivity of the second solution in the second chamber are detected using a conductivity meter; and In response to the rate of change of the first conductivity being within a first preset range and / or the rate of change of the second conductivity being within a second preset range, it is determined that the ion exchange membrane has failed.

16. The method as described in claim 11, characterized in that, In step S1140, controlling the air intake unit to input gas into the first chamber, and the failure detection unit detecting whether the compressed ion membrane has failed based on the air bubbles in the second chamber, include: The air intake unit is controlled to introduce a first gas into the first chamber, and the liquid intake unit is controlled to introduce a third solution into the second chamber; and The presence of bubbles in the second chamber indicates that the ion exchange membrane has failed.

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