An electrolytic cell

Abstract

The application relates to the technical field of electrolytic cell fastening, in particular to an electrolytic cell. The electrolytic cell comprises a first pressing plate, a second pressing plate, a core assembly and a fastening assembly, the core assembly is arranged between the first pressing plate and the second pressing plate, and the core assembly comprises a plurality of membrane electrode assemblies and bipolar plates which are arranged in sequence. In the height direction of the electrolytic cell, the projection surface of the core assembly is located in the middle part of the projection surface of the first pressing plate and the projection surface of the second pressing plate. The fastening assembly comprises a plurality of first fastening groups, part of the structure of each first fastening group can be fixedly connected in sequence through the middle part of the first pressing plate, the cavity opening of the membrane electrode assembly, the cavity opening of the bipolar plate and the middle part of the second pressing plate, so as to compress the core assembly. The first fastening group and the second fastening group are matched to increase the locking pressure of the middle and edges of the electrolytic cell, and the sealing performance of the edge part and the middle part of the electrolytic cell is improved. The first fastening group penetrates through the original cavity opening, and no avoiding structure needs to be arranged, so that the structure is simple and the cost is saved.

Description

Technical Field

[0001] This application relates to the field of electrolytic cell fastening technology, and more particularly to an electrolytic cell. Background Technology

[0002] Proton exchange membrane electrolyzers are used in the field of water electrolysis for hydrogen production. They are typically composed of dozens to hundreds of membrane electrode assemblies stacked together, and finally assembled into an electrolyzer product by end plate assemblies and bolts. Electrolysis of water produces hydrogen and oxygen; therefore, the electrolyzer is usually divided into a water chamber and a hydrogen chamber, each chamber being independently sealed. The water chamber generally contains both liquid water and oxygen.

[0003] Typically, bolts are placed on the outside of the electrolytic cell to secure its components, which effectively prevents external leakage. However, there is still a risk of cross-leakage between internal chambers under high pressure conditions. If hydrogen leaks and the mixing ratio with oxygen exceeds the permissible limit, there is a risk of explosion. Utility Model Content

[0004] This application provides an electrolytic cell with fasteners added at the cavity opening to apply a locking force from the inside of the battery cell, thereby improving the sealing performance of the electrolytic cell and reducing the risk of gas leakage due to deformation of the internal sealing structure.

[0005] This application embodiment provides an electrolytic cell, the electrolytic cell comprising: First pressure plate and second pressure plate; A core assembly is disposed between a first pressure plate and a second pressure plate. The core assembly includes a plurality of membrane electrode assemblies and bipolar plates stacked sequentially. Along the height direction of the electrolytic cell, the projection surface of the core assembly is located in the middle part between the projection surfaces of the first pressure plate and the second pressure plate. The fastening assembly includes multiple first fastening groups, each of which has a portion of its structure capable of sequentially passing through the middle portion of the first pressure plate, the cavity of the membrane electrode assembly, the cavity of the bipolar plate, and being fixedly connected to the middle portion of the second pressure plate to press the core assembly tightly.

[0006] In one possible design, the first fastening group has at least six components, and the membrane electrode assembly and the water, hydrogen, and oxygen ports arranged on the bipolar plate all pass through the first fastening group.

[0007] In one possible design, the first fastening assembly includes a first fastener, a first fixing member, a first washer, and a first elastic member; One end of the first fastener passes through the middle part of the first pressure plate, the cavity of the membrane electrode assembly, the cavity of the bipolar plate, and is fixedly connected to the middle part of the second pressure plate; The first fixing member, the first washer, and the first elastic member are all sleeved on the outside of the first fastener and located on the first pressure plate; The first fixing member is fixedly connected to the end of the first fastener away from the second pressure plate. The first gasket is disposed between the first fixing member and the first elastic member. One end of the first elastic member abuts against the first gasket, and the other end abuts against the upper surface of the first pressure plate.

[0008] In one possible design, the first fastening assembly further includes a first sealing cover, which is disposed on the first pressure plate and is sealed to the upper end face of the first pressure plate. The first fastener, the portion of the structure located in the external environment, the first fixing member, the first gasket, and the first elastic member are all disposed within the first sealing cover.

[0009] In one possible design, the first sealing cover is provided with a connecting groove, and a portion of the structure of the first fastener is fixedly connected to the connecting groove.

[0010] In one possible design, the first fastening assembly further includes a first seal; The first pressure plate has a first sealing groove on the end face away from the core assembly, and the first sealing element is disposed in the first sealing groove and compressed between the first sealing cover and the first pressure plate.

[0011] In one possible design, the electrolytic cell further includes a first insulating plate, a first current collector plate, a second insulating plate, and a second current collector plate, wherein the first pressure plate, the first insulating plate, the first current collector plate, the core assembly, the second current collector plate, the second insulating plate, and the second pressure plate are stacked sequentially. One end of the first fastener passes through the first pressure plate, the cavity of the first insulating plate, and the cavity of the first current collector in sequence. The cavity of the core assembly, the second current collector, the second insulating plate, and the second pressure plate are threadedly connected. The first fastener does not penetrate the second pressure plate.

[0012] In one possible design, the end face of the second pressure plate near the second insulating plate is provided with a second sealing groove, and the second sealing groove surrounds the outer periphery of the first fastener; The first fastening assembly includes a second sealing element, which is disposed in the second sealing groove and is compressed between the first pressure plate and the first insulating plate. The second insulating plate has a third sealing groove on its end face near the second current collector plate, and the third sealing groove surrounds the outer periphery of the first fastener; The first fastening assembly further includes a third sealing element, which is disposed in the third sealing groove and compressed between the second insulating plate and the second current collector plate.

[0013] In one possible design, the fastening assembly further includes a plurality of second fastening groups, each of which has a portion of its structure capable of being fixedly connected to the edge portion of the first pressure plate to press the core assembly.

[0014] In one possible design, the second fastening assembly includes a second fastener, a second fixing member, a second washer, and a second elastic member; One end of the second fastener passes through the edge portion of the first pressure plate and is fixedly connected to the edge of the second pressure plate; The second fastener, the second washer, and the second elastic member are all sleeved on the outside of the second fastener and located on the first pressure plate; The second fixing member is fixedly connected to the end of the second fastener away from the second pressure plate. The second gasket is disposed between the second fixing member and the second elastic member. One end of the second elastic member abuts against the second gasket, and the other end abuts against the upper surface of the second pressure plate.

[0015] The beneficial effects of this application embodiment are as follows: This application embodiment sets a first fastening group to lock the middle part of the electrolytic cell and sets a second fastening group to lock the edge part of the electrolytic cell. By cooperating with the first fastening group and the second fastening group, the locking pressure of the middle and edge of the electrolytic cell is increased, thereby increasing the sealing performance of the edge and middle parts of the electrolytic cell and further reducing the risk of gas leakage.

[0016] Furthermore, in this embodiment, the first fastening group passes through the original cavity on the first insulating plate, the first current collector plate, and the core assembly, eliminating the need for a clearance structure on the first insulating plate, the first current collector plate, and the core assembly. At the same time, it does not affect the operation of the first insulating plate, the first current collector plate, and the core assembly, resulting in a simple structure and cost savings.

[0017] It should be understood that the above general description and the following detailed description are merely exemplary and do not limit this application. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the electrolytic cell provided in this application; Figure 2 for Figure 1 Another structural diagram from another perspective; Figure 3 for Figure 1 A cross-sectional view; Figure 4A schematic diagram of a portion of the core assembly structure provided in this application; Figure 5 This is a schematic diagram showing the first fastening group assemblies in conjunction with some core components. Figure 6 for Figure 3 Enlarged diagram of section A in the middle; Figure 7 This is a cross-sectional schematic diagram of the first sealing cover; Figure 8 for Figure 3 Enlarged schematic diagram of section B in the middle; Figure 9 for Figure 3 Enlarged schematic diagram of section C.

[0019] Figure label: 1-Electrolytic cell; 11-First pressure plate; 111 - First sealing groove; 112 - Fourth sealing groove; 113 - Fourth seal; 12 - Second pressure plate; 121 - Second sealing groove; 13-Core assembly; 131 - Membrane electrode assembly; 132-Bipolar plate; 13a-Water cavity opening; 13b-Hydrogen cavity port; 13c - Oxygen chamber opening; 14-Fastening components; 141 - First fastening group; 141a - First fastener; 141b - First fastener; 141c - First gasket; 141d - First elastic element; 141e - First Sealing Cover; 141e1 - Connecting slot; 141e2 - Operating plane; 141f - First seal; 141g - Second seal; 141h - Third seal; 142 - Second fastening group; 142a - Second fastener; 142b - Second fastener; 142c - Second gasket; 142d - Second elastic element; 15 - First Insulation Board; 16 - First collector board; 161 - Fifth sealing groove; 162 - Fifth seal; 17-Second collector board; 18 - Second Insulation Board; 181 - Third sealing groove.

[0020] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. Detailed Implementation

[0021] To better understand the technical solution of this application, the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0022] It should be understood that the described embodiments are merely some, not all, of the embodiments in this application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0023] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0024] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0025] It should be noted that the directional terms such as "upper," "lower," "left," and "right" described in the embodiments of this application are used to describe the angles shown in the accompanying drawings and should not be construed as limiting the embodiments of this application. Furthermore, in the context, it should be understood that when it is mentioned that an element is connected "upper" or "lower" to another element, it can be directly connected to the other element "upper" or "lower," or indirectly connected to the other element "upper" or "lower" through an intermediate element.

[0026] This application provides an electrolytic cell where electrolysis of water produces hydrogen and oxygen. Therefore, the electrolytic cell is typically divided into a water chamber, an oxygen chamber, and a hydrogen chamber, with each chamber being independently sealed. The water chamber generally contains both liquid water and oxygen.

[0027] Figure 1This is a schematic diagram of the structure of electrolytic cell 1. Figure 2 for Figure 1 Please refer to the diagram from another perspective. Figure 1 and Figure 2 The electrolytic cell 1 includes a first pressure plate 11, a first insulating plate 15, a first current collector plate 16, a core assembly 13, a second current collector plate 17, a second insulating plate 18, a second pressure plate 12, and a fastening assembly 14. The first pressure plate 11, the first insulating plate 15, the first current collector plate 16, the core assembly 13, the second current collector plate 17, the second insulating plate 18, and the second pressure plate 12 are stacked sequentially. The fastening assembly 14 presses the first pressure plate 11, the first insulating plate 15, the first current collector plate 16, the core assembly 13, the second current collector plate 17, the second insulating plate 18, and the second pressure plate 12 to apply a locking force to the core assembly 13, thereby reducing the risk of cross-leakage between the chambers of the electrolytic cell 1 due to deformation of the sealing structure caused by high pressure and failure of the sealing structure.

[0028] Specifically, Figure 3 This is a cross-sectional view of electrolytic cell 1. Please refer to the reference. Figure 1 and Figure 3 Along the height direction Z of the electrolytic cell 1, the projection surface of the core assembly 13 is located in the middle part of the projection surface of the first pressure plate 11 and the projection surface of the second pressure plate 12. Along the height direction Z of the electrolytic cell 1, the projection surfaces of the first insulating plate 15, the first current collector plate 16, the core assembly 13, the second current collector plate 17, and the second insulating plate 18 are the same.

[0029] Please continue to refer to the reference. Figure 1 and Figure 3 The fastening assembly 14 includes a plurality of first fastening groups 141 and a plurality of second fastening groups 142. The first fastening groups 141 are located closer to the center of the electrolytic cell 1 than the second fastening groups 142. The first fastening groups 141 can lock and fix the internal structure of the electrolytic cell 1 from the middle part of the electrolytic cell 1, and the second fastening groups 142 can lock and fix the internal structure of the electrolytic cell 1 from the edge part of the electrolytic cell 1.

[0030] Specifically, a portion of the structure of each first fastening group 141 can sequentially pass through the cavity of the first pressure plate 11, the cavity of the first insulating plate 15, the cavity of the first current collector plate 16, the cavity of the core assembly 13, the second current collector plate 17, the second insulating plate 18, and the middle portion of the second pressure plate 12 to securely press the core assembly 13. A portion of the structure of each second fastening group 142 can pass through the edge portion of the first pressure plate 11 and the edge portion of the second pressure plate 12 to securely press the core assembly 13.

[0031] In this embodiment, a first fastening group 141 is provided to lock the middle part of the electrolytic cell 1, and a second fastening group 142 is provided to lock the edge part of the electrolytic cell 1. By cooperating with the first fastening group 141 and the second fastening group 142, the locking pressure of the middle and edge of the electrolytic cell 1 is increased, thereby increasing the sealing performance of the edge and middle parts of the electrolytic cell 1 and further reducing the risk of gas leakage.

[0032] Furthermore, in this embodiment, the first fastening assembly 141 passes through the original cavities on the first insulating plate 15, the first current collector plate 16, and the core assembly 13, eliminating the need to provide a clearance structure on the first insulating plate 15, the first current collector plate 16, and the core assembly 13. At the same time, it does not affect the operation of the first insulating plate 15, the first current collector plate 16, and the core assembly 13, resulting in a simple structure and cost savings.

[0033] Figure 4 This is a schematic diagram of the structure of the 13-part core assembly. Figure 5 This is a schematic diagram showing the mating of the first fastening assembly 141 with a portion of the core assembly 13. Please refer to the reference. Figure 4 and Figure 5 The core assembly 13 includes multiple membrane electrode groups 131 and bipolar plates 132 arranged in sequence.

[0034] Please refer to the reference. Figure 3 and Figure 5 The first fastening assembly 141 can pass through the middle part of the first pressure plate 11, the cavity of the membrane electrode assembly 131, the cavity of the bipolar plate 132 and the middle part of the second pressure plate 12 in sequence to fix and press the core assembly 13 tightly.

[0035] Please continue to refer to the reference. Figure 3 and Figure 5 The first fastening group 141 has at least six parts, and the water cavity 13a, hydrogen cavity 13b and oxygen cavity 13c arranged on both sides of the membrane electrode group 131 and the bipolar plate 132 are all penetrated by the first fastening group 141.

[0036] It is understood that this embodiment uses six fastening groups 141 as an example. Alternatively, in other embodiments, twelve, eighteen, or other fastening groups 141 may be provided, depending on the actual situation. This embodiment does not limit this.

[0037] Figure 6 for Figure 3 Please refer to the enlarged diagram of section A in the middle. Figure 3 , Figure 5 and Figure 6The first fastening assembly 141 includes a first fastener 141a, a first fixing member 141b, a first gasket 141c, and a first elastic member 141d. One end of the first fastener 141a passes through the middle part of the first pressure plate 11, the cavity of the first insulating plate 15, the cavity of the first current collector 16, the cavity of the membrane electrode assembly 131, the cavity of the bipolar plate 132, the cavity of the second current collector 17, and the cavity of the second insulating plate 18, and is fixedly connected to the middle part of the second pressure plate 12.

[0038] The first fastener 141a can be a screw, and the first fastener 141a is threadedly connected to the second pressure plate 12. Alternatively, in other embodiments, the first fastener 141a can also be other rod structures, which can be set according to the actual situation, and this embodiment does not limit it.

[0039] Please continue to refer to the reference. Figure 3 and Figure 6 The first fixing member 141b, the first washer 141c, and the first elastic member 141d are all sleeved on the outside of the first fastener 141a and located on the first pressure plate 11. The first fixing member 141b is fixedly connected to the end of the first fastener 141a away from the second pressure plate 12. The first washer 141c and the first elastic member 141d are disposed between the first fixing member 141b and the upper end face of the first pressure plate 11, with the first washer 141c disposed close to the first fixing member 141b. One end of the first elastic member 141d abuts against the first washer 141c, and the other end abuts against the upper end face of the first pressure plate 11.

[0040] The first fixing member 141b can be a nut, and it is threadedly connected to the first fastener 141a. The first elastic member 141d can be multiple disc springs, or it can be other elastic components. The first gasket 141c can be a flat gasket, and its projection surface can cover the projection surface of the first elastic member 141d along the height direction Z of the electrolytic cell 1.

[0041] In this embodiment, the first elastic element 141d is compressed between the first fixing element 141b and the first pressure plate 11. The first elastic element 141d can provide a pre-tightening force so that when the sealing structure of the electrolytic cell 1 is deformed and becomes loose, the first elastic element 141d can press the first pressure plate 11 under its own elastic force so that the internal components of the electrolytic cell 1 are kept in the original connection position and maintain a good sealing effect.

[0042] Please continue to refer to the reference. Figure 3 and Figure 6The first fastening assembly 141 also includes a first sealing cover 141e, which is disposed on the first pressure plate 11. The first fastener 141a, the part of the first fastener 141a located in the external environment, the first fixing member 141b, the first gasket 141c and the first elastic member 141d are all disposed inside the first sealing cover 141e. The first sealing cover 141e is sealed to the upper end face of the first pressure plate 11.

[0043] In this embodiment, a first sealing cover 141e is provided to cover the first fastener 141a, the first gasket 141c and the first elastic member 141d. The first sealing cover 141e is sealed to the first pressure plate 11, which seals the connection between the first fastener 141a and the first pressure plate 11 and prevents gas leakage.

[0044] Figure 7 This is a cross-sectional view of the first sealing cover 141e. Please refer to the reference. Figure 6 and Figure 7 The first sealing cover 141e is provided with a connecting groove 141e1, and part of the structure of the first fastener 141a is fixedly connected to the connecting groove 141e1.

[0045] The inner wall of the connecting groove 141e1 is threaded, and the first fastener 141a is threadedly connected to the connecting groove 141e1. Please refer to [further details]. Figure 7 The outer wall of the first sealing cover 141e is provided with an operating surface 141e2. The operator can use a wrench to hold the operating surface 141e2 for operation.

[0046] Alternatively, in other embodiments, the connecting groove 141e1 of the first sealing cover 141e and the first fastener 141a can also be fixed in other ways, such as interference fit, etc. The specific method can be set according to the actual situation, and this embodiment does not limit it here.

[0047] Please continue to refer to the reference. Figure 3 and Figure 6 The first fastening assembly 141 also includes a first sealing element 141f. The end face of the first pressure plate 11 facing away from the core assembly 13 is provided with a first sealing groove 111. The first sealing element 141f is disposed in the first sealing groove 111 and is compressed between the first sealing cover 141e and the first pressure plate 11.

[0048] In this embodiment, after the first sealing cover 141e is installed, it can compress the first sealing element 141f into the first sealing groove 111. The first sealing element 141f surrounds the outer periphery of the first fastener 141a, sealing the connection between the first sealing cover 141e and the first pressure plate 11 to prevent gas leakage.

[0049] The first sealing element 141f can be made of rubber or other materials, and the specific design can be determined according to the actual situation. This embodiment does not limit the specific design.

[0050] Figure 8 for Figure 3 Please refer to the enlarged diagram of section B. Figure 3 and Figure 8 The first fastener 141a is not installed through the second pressure plate 12. In other words, the first fastener 141a does not penetrate the second pressure plate 12, reducing the risk of gas leakage along the connection between the first fastener 141a and the second pressure plate 12.

[0051] The second pressure plate 12 is provided with a fixing groove, and the first fastener 141a is fixedly connected to the fixing groove. The inner side wall of the fixing groove is provided with threads, and the first fastener 141a is threadedly connected to the fixing groove.

[0052] Please continue to refer to the reference. Figure 3 and Figure 8 The second pressure plate 12 has a second sealing groove 121 on its end face near the second insulating plate 18, and the second sealing groove 121 surrounds the outer periphery of the first fastener 141a. The first fastening assembly 141 also includes a second sealing element 141g, which is disposed in the second sealing groove 121 and compressed between the second pressure plate 12 and the second insulating plate 18.

[0053] In this embodiment, the second sealing member 141g is arranged in a circle around the outer periphery of the first fastener 141a and compressed between the second pressure plate 12 and the second insulating plate 18, sealing the connection position between the second pressure plate 12 and the second insulating plate 18, and preventing gas from leaking out along the first fastener 141a, the second pressure plate 12 and the second insulating plate 18.

[0054] The second sealing element 141g can be made of rubber or other materials, and the specific design can be determined according to the actual situation. This embodiment does not limit the specific design.

[0055] Please continue to refer to the reference. Figure 3 and Figure 8 The second insulating plate 18 has a third sealing groove 181 on its end face near the second current collector plate 17, and the third sealing groove 181 surrounds the outer periphery of the first fastener 141a. The first fastening assembly 141 also includes a third sealing element 141h, which is disposed in the third sealing groove 181 and compressed between the second insulating plate 18 and the second current collector plate 17.

[0056] In this embodiment, the third sealing element 141h is arranged in a circle around the outer periphery of the first fastener 141a and compressed between the second insulating plate 18 and the second current collector 17, sealing the connection position between the second insulating plate 18 and the second current collector 17, and preventing gas from leaking out along the gap between the first fastener 141a, the second insulating plate 18 and the second current collector 17.

[0057] The third sealing element 141h can be made of rubber or other materials, and the specific design can be determined according to the actual situation. This embodiment does not limit the specific design.

[0058] Understandably, the bipolar plate 132 in the core assembly 13 is connected to the second current collector plate 17, and the bipolar plate 132 is provided with a sealing structure that can seal the connection position between the second current collector plate 17 and the first fastener 141a.

[0059] Understandably, both the first insulating plate 15 and the first collector plate 16 are provided with cavities, and the outer periphery of the cavities is provided with sealing structures, which can seal the cavities through which the first fastener 141a penetrates the first insulating plate 15 and the first collector plate 16.

[0060] Specifically Figure 9 for Figure 3 Please refer to the enlarged diagram of section C. Figure 3 and Figure 9 A fourth sealing groove 112 is provided on the side of the first pressure plate 11 facing the first insulating plate 15. The fourth sealing groove 112 surrounds the outer periphery of the cavity (i.e., the first fastener 141a) of the first insulating plate 15. A fourth sealing element 113 is provided in the fourth sealing groove 112, and the fourth sealing element 113 is compressed between the first pressure plate 11 and the first insulating plate 15.

[0061] A fifth sealing groove 161 is provided on the side of the first current collector plate 16 facing the first insulating plate 15. The fifth sealing groove 161 surrounds the outer periphery of the cavity (i.e., the first fastener 141a) of the first current collector plate 16. A fifth sealing element 162 is provided in the fifth sealing groove 161, and the fifth sealing element 162 is compressed between the first insulating plate 15 and the first current collector plate 16.

[0062] Understandably, the bipolar plate 132 in the core assembly 13 is connected to the first current collector plate 16, and the bipolar plate 132 is provided with a sealing structure that can seal the connection position between the first current collector plate 16 and the bipolar plate 132.

[0063] Please continue to refer to this. Figure 3 The second fastening assembly 142 includes a second fastener 142a, a second fixing member 142b, a second gasket 142c, and a second elastic member 142d. One end of the second fastener 142a passes through the edge portion of the first pressure plate 11 and is fixedly connected to the edge of the second pressure plate 12.

[0064] The second fastener 142a can be a screw, and the second fastener 142a is threadedly connected to the second pressure plate 12. Alternatively, in other embodiments, the second fastener 142a can also be other rod structures, which can be set according to the actual situation, and this embodiment does not limit it.

[0065] Please continue to refer to this. Figure 3 The second fixing member 142b, the second washer 142c, and the second elastic member 142d are all sleeved on the outside of the second fastener 142a and located on the first pressure plate 11. The second fixing member 142b is fixedly connected to the end of the second fastener 142a away from the second pressure plate 12. The second washer 142c and the second elastic member 142d are disposed between the second fixing member 142b and the upper end face of the first pressure plate 11, with the second washer 142c disposed close to the second fixing member 142b. One end of the second elastic member 142d abuts against the second washer 142c, and the other end abuts against the upper end face of the second pressure plate 12.

[0066] The second fixing member 142b can be a nut, and it is threadedly connected to the second fastener 142a. The second elastic member 142d can be multiple disc springs, or it can be other elastic components. The second gasket 142c can be a flat gasket, and its projection surface can cover the projection surface of the second elastic member 142d along the height direction Z of the electrolytic cell 1.

[0067] In this embodiment, the second elastic element 142d is compressed between the second fixing element 142b and the first pressure plate 11. The second elastic element 142d can provide a pre-tightening force so that when the sealing structure of the electrolytic cell 1 is deformed and becomes loose, the second elastic element 142d can press the first pressure plate 11 under its own elastic force so that the internal components of the electrolytic cell 1 are kept in the original connection position and maintain a good sealing effect.

[0068] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An electrolytic cell, characterized in that, The electrolytic cell (1) includes: First pressure plate (11) and second pressure plate (12); The core assembly (13) is disposed between the first pressure plate (11) and the second pressure plate (12). The core assembly (13) includes a plurality of membrane electrode assemblies (131) and bipolar plates (132) stacked sequentially. Along the height direction (Z) of the electrolytic cell (1), the projection surface of the core assembly (13) is located in the middle part between the projection surface of the first pressure plate (11) and the projection surface of the second pressure plate (12). Fastening assembly (14) includes a plurality of first fastening groups (141), and a portion of the structure of each first fastening group (141) can pass sequentially through the middle part of the first pressure plate (11), the cavity of the membrane electrode group (131), the cavity of the bipolar plate (132) and be fixedly connected to the middle part of the second pressure plate (12) to press the core assembly (13).

2. The electrolytic cell according to claim 1, characterized in that, The first fastening assembly (141) has at least six parts, and the membrane electrode assembly (131) and the water cavity (13a), hydrogen cavity (13b) and oxygen cavity (13c) arranged on the bipolar plate (132) all pass through the first fastening assembly (141).

3. The electrolytic cell according to claim 1, characterized in that, The first fastening assembly (141) includes a first fastener (141a), a first fixing member (141b), a first washer (141c), and a first elastic member (141d). One end of the first fastener (141a) passes through the middle part of the first pressure plate (11), the cavity of the membrane electrode assembly (131), the cavity of the bipolar plate (132), and is fixedly connected to the middle part of the second pressure plate (12). The first fastener (141b), the first washer (141c) and the first elastic member (141d) are all sleeved on the outside of the first fastener (141a) and located on the first pressure plate (11); The first fixing member (141b) is fixedly connected to the end of the first fastener (141a) away from the second pressure plate (12). The first gasket (141c) is disposed between the first fixing member (141b) and the first elastic member (141d). One end of the first elastic member (141d) abuts against the first gasket (141c), and the other end abuts against the upper surface of the first pressure plate (11).

4. The electrolytic cell according to claim 3, characterized in that, The first fastening assembly (141) further includes a first sealing cover (141e), which is disposed on the first pressure plate (11) and is sealed to the upper end face of the first pressure plate (11); The first fastener (141a), the part of the structure located in the external environment, the first fixing member (141b), the first gasket (141c), and the first elastic member (141d) are all disposed inside the first sealing cover (141e).

5. The electrolytic cell according to claim 4, characterized in that, The first sealing cover (141e) is provided with a connecting groove (141e1), and a portion of the structure of the first fastener (141a) is fixedly connected to the connecting groove (141e1).

6. The electrolytic cell according to claim 4, characterized in that, The first fastening assembly (141) also includes a first seal (141f); The first pressure plate (11) has a first sealing groove (111) on the end face away from the core assembly (13), and the first sealing element (141f) is disposed in the first sealing groove (111). The first sealing element (141f) is compressed between the first sealing cover (141e) and the first pressure plate (11).

7. The electrolytic cell according to claim 3, characterized in that, The electrolytic cell (1) further includes a first insulating plate (15), a first current collector plate (16), a second current collector plate (17), and a second insulating plate (18), wherein the first pressure plate (11), the first insulating plate (15), the first current collector plate (16), the core assembly (13), the second current collector plate (17), the second insulating plate (18), and the second pressure plate (12) are stacked in sequence; One end of the first fastener (141a) passes through the cavity of the first pressure plate (11), the cavity of the first insulating plate (15), and the cavity of the first current collector plate (16) in sequence. The cavity of the core assembly (13), the second current collector plate (17), the second insulating plate (18) and the second pressure plate (12) are threaded together. The first fastener (141a) does not penetrate the second pressure plate (12).

8. The electrolytic cell according to claim 7, characterized in that, The second pressure plate (12) has a second sealing groove (121) on its end face near the second insulating plate (18), and the second sealing groove (121) surrounds the outer periphery of the first fastener (141a); The first fastening assembly (141) includes a second sealing element (141g), which is disposed in the second sealing groove (121) and is compressed between the first pressure plate (11) and the first insulating plate (15); The second insulating plate (18) has a third sealing groove (181) on its end face near the second current collector plate (17), and the third sealing groove (181) surrounds the outer periphery of the first fastener (141a); The first fastening assembly (141) further includes a third seal (141h), which is disposed in the third sealing groove (181) and is compressed between the second insulating plate (18) and the second current collector plate (17).

9. The electrolytic cell according to any one of claims 1 to 8, characterized in that, The fastening assembly (14) further includes a plurality of second fastening groups (142), each of which has a portion of its structure capable of passing through the edge portion of the first pressure plate (11) and being fixedly connected to the edge portion of the second pressure plate (12) to press the core assembly (13).

10. The electrolytic cell according to claim 9, characterized in that, The second fastening assembly (142) includes a second fastener (142a), a second fixing member (142b), a second washer (142c), and a second elastic member (142d). One end of the second fastener (142a) passes through the edge portion of the first pressure plate (11) and is fixedly connected to the edge of the second pressure plate (12); The second fastener (142b), the second washer (142c), and the second elastic member (142d) are all sleeved on the outside of the second fastener (142a) and located on the first pressure plate (11); The second fixing member (142b) is fixedly connected to the end of the second fastener (142a) away from the second pressure plate (12). The second gasket (142c) is disposed between the second fixing member (142b) and the second elastic member (142d). One end of the second elastic member (142d) abuts against the second gasket (142c), and the other end abuts against the upper surface of the second pressure plate (12).

Images