Electrochemical device

Abstract

The present application relates to an electrochemical device including an upper end plate, a lower end plate, a plurality of cells stacked between the upper end plate and the lower end plate in a first direction, and connectors located on the peripheries of the cells, the connectors being connected to the upper end plate and the lower end plate in the first direction. One end of the connecting piece is detachably connected with the upper end plate, and the other end of the connecting piece is detachably connected with the lower end plate. The connecting piece is connected with the single body in an abutting mode. According to the electrochemical device, the connecting pieces can limit the upper end plate, the single bodies and the lower end plate to be separated from one another in the first direction, the connection tightness and reliability among the three are improved, and then the leakage risk of the electrochemical device is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of hydrogen production, in particular to an electrochemical device. Background Art

[0002] Electrochemical devices are used to produce hydrogen by electrolyzing water. They are generally composed of stacked components such as membrane electrodes, plates, diffusion plates, and end plates. They have the advantages of being lightweight, fast in reaction speed, and producing high purity hydrogen. The number of stacked membrane electrodes, plates, and diffusion layers determines the amount of hydrogen produced. The more stacked the number is, the larger the size of the electrochemical device is. Large-volume electrochemical devices are prone to loose connections between internal components, resulting in unstable structure of the electrochemical device, which in turn creates the risk of leakage. Utility Model Content

[0003] The present application provides an electrochemical device for solving the problem that the internal components of a huge electrochemical device are not tightly connected, resulting in an unstable structure of the electrochemical device and thus easily causing leakage.

[0004] The present application provides an electrochemical device, the electrochemical device comprising an upper end plate, a lower end plate, a plurality of monomers and a connector, the plurality of monomers are stacked between the upper end plate and the lower end plate along a first direction, the connector is located at the periphery of the monomer, one end of the connector is detachably connected to the upper end plate, and the other end is detachably connected to the lower end plate along the first direction. The connector abuts against the monomer.

[0005] Therefore, the connecting piece connects the upper end plate and the lower end plate, and the upper end plate and the lower end plate are respectively located on both sides of the monomer along the first direction, so that the upper end plate, the lower end plate and the connecting piece form a accommodating space for accommodating the monomer, and multiple monomers are located in the above-mentioned accommodating space, so that the upper end plate and the lower end plate can clamp the multiple monomers therebetween, and the connecting piece can limit the upper end plate, the monomer and the lower end plate from detaching from each other along the first direction, which is beneficial to improving the tightness and reliability of the connection between the three, thereby reducing the risk of leakage of the electrochemical device.

[0006] In this solution, each of the monomers has an upper pressing plate and a lower pressing plate, and both the upper pressing plate and the lower pressing plate include a limiting portion recessed into the interior of the electrochemical device, and at least a portion of the structure of the connector can be located within the limiting portion.

[0007] In this solution, the connecting piece used to connect the upper end plate and the lower end plate cooperates with the limiting parts of the upper pressure plate and the lower pressure plate, so that the connecting piece connects each monomer through the upper pressure plate and the lower pressure plate, thereby limiting the separation of the monomer and the connecting piece from each other, which is beneficial to improving the reliability and stability of the connection between the monomer and the connecting piece, and further reducing the risk of the monomer being separated from the above-mentioned accommodating space.

[0008] In this solution, the connecting member abuts against both the side wall and the bottom wall of the limiting portion.

[0009] In this solution, both the upper pressing plate and the lower pressing plate are rectangular structures, and the upper pressing plate and the lower pressing plate have first limiting parts on both sides parallel to the third direction, that is, the first limiting part is recessed along the second direction, so that the side wall of the first limiting part can limit the relative movement of the connector and the monomer along the third direction. The upper pressing plate and the lower pressing plate have second limiting parts on both sides parallel to the second direction, that is, the second limiting part is recessed along the third direction, so that the side wall of the second limiting part can limit the relative movement of the connector and the monomer along the second direction, which is beneficial to improve the reliability of the connection between the connector and the monomer, thereby reducing the risk of the monomer changing its position under the action of external force when the electrochemical device is working, improving the reliability of the electrochemical device, and reducing the risk of the monomer escaping from the above-mentioned accommodation space. At the same time, the abutment between the connector and the bottom wall of the limiting part can reduce the risk of the monomer tipping over, which is beneficial to improve the safety of the electrochemical device.

[0010] In this solution, the connecting member includes a first protrusion, a second protrusion and a connecting rod, the first protrusion and the second protrusion are located at two ends of the connecting rod along the first direction. The upper end plate has a first limiting groove, the lower end plate has a second limiting groove, the first protrusion is located in the first limiting groove and abuts against the bottom wall of the first limiting groove, and the second protrusion is located in the second limiting groove and abuts against the top wall of the second limiting groove.

[0011] Therefore, the connecting member can limit the relative movement between the upper end plate, the lower end plate and the monomer along the first direction through the mutual abutment between the first protrusion and the first limiting groove, and the second protrusion and the second limiting groove. This method is simple, efficient and easy to implement, which is beneficial to reducing the design cost of the electrochemical device.

[0012] In this solution, the upper end plate and the lower end plate each have a plurality of edge portions, and the edge portions of the upper end plate and the lower end plate are connected by the connecting member.

[0013] In this scheme, at least one first limiting groove is provided on each edge portion of the upper end plate, and at least one second limiting groove is provided on each edge portion of the lower end plate, so that the first limiting groove is provided on the outer periphery of the upper end plate, and then the upper end plate and the lower end plate can be connected along a first direction through multiple connecting parts, further reducing the risk of the upper end plate and the lower end plate detaching from each other in one direction. At the same time, multiple connecting parts abut against the above-mentioned multiple limiting portions, further improving the reliability and stability of the connection between the monomer and the upper end plate and the lower end plate.

[0014] In this embodiment, each of the monomers includes an upper pressure plate, a lower pressure plate, an insulating rod and a membrane electrode assembly. Along the first direction, the membrane electrode assembly is located between the upper pressure plate and the lower pressure plate, and the insulating rod connects the upper pressure plate and the lower pressure plate of the same monomer along the first direction.

[0015] In this solution, one end of the insulating rod is connected to the upper pressing plate along the first direction, and the other end is connected to the lower pressing plate, and then the upper pressing plate and the lower pressing plate are continuously pressed against the membrane electrode assembly along the first direction through the insulating rod, so that the membrane electrode assembly is more tightly connected with the upper pressing plate and the lower pressing plate, which is beneficial to the sealing of the membrane electrode assembly, thereby reducing the risk of fluid leakage in the membrane electrode assembly, and is beneficial to improving the reliability of the electrochemical device during operation. At the same time, in the stacking process of multiple monomers, the insulating rod can prevent the risk of the upper pressing plate, the membrane electrode assembly and the lower pressing plate in each monomer from being offset and loose, thereby improving the reliability of the connection between the upper pressing plate, the membrane electrode assembly and the lower pressing plate, and playing a certain protective role for each monomer.

[0016] In this solution, the upper pressing plate and the lower pressing plate of the same single body are connected by a plurality of insulating rods, and each insulating rod is staggered with each connecting member.

[0017] In this solution, the insulating rods are arranged on the periphery of each monomer, and the upper pressure plate, membrane electrode assembly and lower pressure plate inside each monomer are connected more tightly by the multiple insulating rods, which further improves the sealing of the membrane electrode assembly and reduces the risk of leakage of the electrochemical device. At the same time, the insulating rods are made of insulating material. The insulating rods arranged on the periphery of each monomer can reduce the risk of short circuit during electrolysis of the electrochemical device, and can prevent the risk of electric shock, which is conducive to improving the safety of the electrochemical device.

[0018] In this solution, each of the monomers has an upper pressing plate and a lower pressing plate, and the lower pressing plate of the monomer is detachably connected to the upper pressing plate of the monomer adjacent thereto. The monomers include a first monomer adjacent to the upper end plate and a second monomer adjacent to the lower end plate, a first insulating plate is provided between the upper pressing plate of the first monomer and the upper end plate, and the first insulating plate is detachably connected to the upper pressing plate of the first monomer, a second insulating plate is provided between the lower pressing plate of the second monomer and the lower end plate, and the second insulating plate is detachably connected to the lower pressing plate of the second monomer.

[0019] Therefore, the lower pressing plate of the monomer and the upper pressing plate of the monomer adjacent thereto are detachably connected, that is, each monomer is detachably connected, and the first monomer is detachably connected to the upper end plate via the first insulating plate, and the second monomer is detachably connected to the lower end plate via the second insulating plate, so that each monomer can be removed from the upper end plate and the lower end plate, which is convenient for replacement and maintenance of each monomer. At the same time, each monomer is detachably connected, so that different numbers of monomers can be stacked along the first direction according to the actual required hydrogen production, so that different volumes of hydrogen can be generated, which is conducive to improving the applicability of the electrochemical device and better meeting the actual use needs.

[0020] In this embodiment, two adjacent monomers are detachably connected by fasteners, the first insulating plate and the upper pressure plate of the first monomer are detachably connected by the fasteners, the second insulating plate and the lower pressure plate of the second monomer are detachably connected by the fasteners, and the fasteners are distributed along the diagonal of the electrochemical device.

[0021] In this solution, when the fasteners between adjacent upper pressure plates and lower pressure plates, between adjacent first insulating plates and the upper pressure plates of the first unit, and between the second insulating plates and the lower pressure plates of the second unit are worn out and fail due to excessive connections, only the damaged fasteners need to be replaced, without replacing the upper pressure plates, the lower pressure plates, the first insulating plates, and the second insulating plates. This improves the maintenance efficiency of the staff and reduces the maintenance cost.

[0022] In this solution, one of the upper pressing plate of each monomer and the lower pressing plate of the monomer adjacent thereto is provided with a recessed portion, and the other is provided with a raised portion, and the adjacent monomers cooperate with the raised portion through the recessed portion.

[0023] Therefore, the protrusions and recesses provided can limit the relative movement of the adjacent upper and lower pressing plates along the second direction and / or along the third direction, further improving the stability of the connection between the two adjacent monomers, reducing the risk of misalignment of the connection between the two adjacent monomers, thereby ensuring that the two adjacent monomers can be smoothly connected, thereby improving the overall structural stability of the electrochemical device and the stability and reliability of the electrochemical device during operation. At the same time, the concave-convex matching relationship between the protrusion and the recess can also play a guiding role in the assembly process, so that the connection between the two adjacent monomers is smoother, and the contact area between the adjacent monomers is increased through the matching of the protrusion and the recess, reducing the contact resistance, thereby reducing the energy consumption of the electrochemical device.

[0024] In this embodiment, the electrochemical device is an electrolytic cell or a battery.

[0025] When the electrochemical device is working, the connection between the upper end plate, the lower end plate and the monomer is achieved through various connecting parts to improve the stability of the stacking of various components in the electrochemical device along the first direction. At the same time, the upper end plate and the lower end plate can clamp the membrane electrode assembly in each monomer, reduce the risk of fluid leakage in the membrane electrode assembly, and effectively reduce the energy consumption of the electrochemical device.

[0026] It should be understood that the foregoing general description and the following detailed description are exemplary only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A schematic structural diagram of an electrochemical device provided in the present application in a specific embodiment;

[0028] Figure 2 for Figure 1 A cross-sectional view of

[0029] Figure 3 This is a schematic diagram of the structure of the first monomer provided in this application;

[0030] Figure 4 This is a schematic diagram of the structure of the second monomer provided in this application;

[0031] Figure 5 This is a schematic diagram of the structure of the second monomer provided in this application;

[0032] Figure 6 for Figure 2 sectional view of;

[0033] Figure 7 This is a cross-sectional view of the manifold channel of the electrochemical device structure provided in this application.

[0034] Description of reference numerals:

[0035] 1-Electrochemical device;

[0036] 11- first monomer;

[0037] 111- first power interface;

[0038] 12-second monomer;

[0039] 121- second power interface;

[0040] 13- the third monomer;

[0041] 14- first insulating plate;

[0042] 15- second insulating plate;

[0043] 16-limiting part;

[0044] 161-side wall;

[0045] 162-bottom wall;

[0046] 18- anode interface;

[0047] 181 - anode channel;

[0048] 19- cathode interface;

[0049] 191- cathode channel;

[0050] 2-Upper pressing plate;

[0051] 21-first upper pressing plate;

[0052] 22- second upper pressing plate;

[0053] 221- first recessed portion;

[0054] 23- third upper platen;

[0055] 3-Lower pressure plate;

[0056] 31-first lower pressing plate;

[0057] 311- first protrusion;

[0058] 32- second lower pressing plate;

[0059] 33- the third lower pressing plate;

[0060] 331 - second protrusion;

[0061] 4-Membrane electrode assembly;

[0062] 41- first membrane electrode assembly;

[0063] 42- a second membrane electrode assembly;

[0064] 43-third membrane electrode assembly;

[0065] 5- Seal;

[0066] 51- sealing groove;

[0067] 6-Insulating rod;

[0068] 7- upper end plate;

[0069] 71-first limiting groove;

[0070] 8-lower end plate;

[0071] 81- second limiting groove;

[0072] 9- Fasteners;

[0073] 91-pin hole;

[0074] 10-Connector;

[0075] 101- a first bump;

[0076] 102- second protrusion;

[0077] 103-Connecting rod.

[0078] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application. DETAILED DESCRIPTION

[0079] In order to better understand the technical solution of the present application, the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0080] In a specific embodiment, the present application is further described in detail below through specific embodiments and in conjunction with the accompanying drawings.

[0081] It should be clear that the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0082] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

[0083] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0084] It should be noted that the directional words such as "upper", "lower", "left", and "right" described in the embodiments of the present application are described at the angles shown in the accompanying drawings and should not be understood as limiting the embodiments of the present application. In addition, in the context, it is also necessary to understand that when it is mentioned that an element is connected to another element "upper" or "lower", it can not only be directly connected to another element "upper" or "lower", but also indirectly connected to another element "upper" or "lower" through an intermediate element.

[0085] It should be noted that the first direction, the second direction, and the third direction mentioned in this article can refer to Figure 1In the embodiment shown, in a specific embodiment, the first direction X may be the height direction of the electrochemical device 1, the second direction Y may be the width direction of the electrochemical device 1, and the third direction Z may be the length direction of the electrochemical device 1. Therefore, the first direction, the second direction, and the third direction are perpendicular to each other.

[0086] The present application provides an electrochemical device 1, such as Figure 1 As shown, the electrochemical device 1 includes an upper end plate 7, a lower end plate 8, a plurality of monomers and a connector 10, wherein the plurality of monomers are stacked between the upper end plate 7 and the lower end plate 8 along a first direction X, and the connector 10 is located at the periphery of the monomers, and along the first direction X, one end of the connector 10 is detachably connected to the upper end plate 7, and the other end is detachably connected to the lower end plate 8. The connector 10 abuts against the monomers.

[0087] Therefore, the connector 10 connects the upper end plate 7 and the lower end plate 8, and the upper end plate 7 and the lower end plate 8 are respectively located on both sides of the monomer along the first direction X, so that the upper end plate 7, the lower end plate 8 and the connector 10 enclose a storage space for accommodating the monomer, and multiple monomers are located in the above-mentioned storage space, so that the upper end plate 7 and the lower end plate 8 can clamp the multiple monomers between them, and the connector 10 can limit the upper end plate 7, the monomer and the lower end plate 8 from being separated from each other along the first direction X, which is conducive to improving the tight connection and reliability between the three, thereby reducing the risk of leakage of the electrochemical device 1. At the same time, the connector 10 is detachably connected to the upper end plate 7 and the lower end plate 8, so that the monomer connected between the upper end plate 7 and the lower end plate 8 can be removed, thereby facilitating the maintenance and replacement of the monomer, and meeting the actual use requirements. In addition, the connector 10 located at the periphery of each monomer can abut against the monomer, thereby limiting the movement of the monomer in a direction perpendicular to the first direction X, that is, limiting the monomer from being separated from the above-mentioned storage space in a direction perpendicular to the first direction X, further improving the structural stability and reliability of the electrochemical device 1.

[0088] The upper end plate 7 and the connecting member 10 may be connected by bolts, and the lower end plate 8 and the connecting member 10 may be connected by bolts, so that the upper end plate 7, the lower end plate 8 and the connecting member 10 are detachably connected.

[0089] In a specific embodiment, Figure 1 As shown, the connecting member 10 includes a first protrusion 101, a second protrusion 102 and a connecting rod 103 connected to each other, and the first protrusion 101 and the second protrusion 102 are located at both ends of the connecting rod 103 along the first direction X. The upper end plate 7 has a first limiting groove 71, and the lower end plate 8 has a second limiting groove 81. The first protrusion 101 is located in the first limiting groove 71 and abuts against the bottom wall of the first limiting groove 71, and the second protrusion 102 is located in the second limiting groove 81 and abuts against the top wall of the second limiting groove 81.

[0090] In the embodiment of the present application, the first protrusion 101 abuts against the bottom wall of the first limiting groove 71 to limit the upper end plate 7 from moving in the first direction X in a direction away from the lower end plate 8, and the second protrusion 102 abuts against the top wall of the second limiting groove 81 to limit the lower end plate 8 from moving in the first direction X in a direction away from the upper end plate 7, so that the upper end plate 7 and the lower end plate 8 can keep squeezing each monomer, thereby improving the compactness and stability of the stacking of each monomer in the first direction X. Therefore, the connector 10 can limit the relative movement of the upper end plate 7, the lower end plate 8 and the monomer in the first direction X by the mutual abutment between the first protrusion 101 and the first limiting groove 71, and the second protrusion 102 and the second limiting groove 81. This method is simple, efficient, and easy to implement, which is conducive to reducing the design cost of the electrochemical device 1.

[0091] Specifically, the first protrusion 101 and the side wall of the first limiting groove 71 may be connected by bolts, and the second protrusion 102 and the side wall of the second limiting groove 81 may be connected by bolts.

[0092] In a specific embodiment, Figure 1 As shown, both the upper end plate 7 and the lower end plate 8 have a plurality of edge portions, and each edge portion of the upper end plate 7 and the lower end plate 8 are connected by a connector 10. That is, at least one first limiting groove 71 is provided on each edge portion of the upper end plate 7, and at least one second limiting groove 81 is provided on each edge portion of the lower end plate 8, so that the first limiting groove 71 is provided on the outer periphery of the upper end plate 7, and then the upper end plate 7 and the lower end plate 8 can be connected along the first direction X by the plurality of connectors 10, further reducing the risk of the upper end plate 7 and the lower end plate 8 being separated from each other along the direction X, and at the same time, the plurality of connectors 10 abut against the plurality of limiting portions 16, further improving the reliability and stability of the connection between the monomer and the upper end plate 7 and the lower end plate 8.

[0093] In such Figure 1 In the illustrated embodiment, the upper end plate 7 and the lower end plate 8 are both structures with a rectangular cross-section, that is, the upper end plate 7 and the lower end plate 8 both have four edge portions, the four edge portions of the upper end plate 7 are each provided with a first limiting groove 71, and the four edge portions of the lower end plate 8 are each provided with a second limiting groove 81, so that the four edge portions of the upper end plate 7 and the four edge portions of the lower end plate 8 are connected by the connecting piece 10, thereby enclosing a rectangular shaped accommodating space.

[0094] In a specific embodiment, Figure 1 As shown, each unit includes an upper pressure plate 2, a lower pressure plate 3, and a membrane electrode assembly 4. The upper pressure plate 2 and the lower pressure plate 3 are distributed along a first direction X, and the membrane electrode assembly 4 is located between the upper pressure plate 2 and the lower pressure plate 3. The upper pressure plate 2 and the lower pressure plate 3 can press the membrane electrode assembly 4 located therebetween along the first direction X.

[0095] exist Figure 1 and Figure 2 In the illustrated embodiment, the monomers of the electrochemical device 1 include a first monomer 11, a second monomer 12, and at least one third monomer 13, wherein the first monomer 11 is close to the upper end plate 7 along the first direction X, the second monomer 12 is close to the lower end plate 8 along the first direction X, and the at least one third monomer 13 is located between the first monomer 11 and the second monomer 12 along the first direction X. The upper end plate 7 is insulated from the first monomer 11 by a first insulating plate 14, and the lower end plate 8 is insulated from the second monomer 12 by a second insulating plate 15, so as to avoid the possibility of current creeping from the membrane electrode assembly 4 to the upper end plate 7 and the lower end plate 8 during current transmission, thereby improving the safety of the electrochemical device 1 during operation.

[0096] In a specific embodiment, when the electrochemical device 1 is an electrolytic cell, Figure 2 As shown, the first monomer 11 also includes a first power interface 111, and the second monomer 12 also includes a second power interface 121. The first power interface 111 is electrically connected to the membrane electrode assembly 4 of the first monomer 11, and the second power interface 121 is electrically connected to the membrane electrode assembly 4 of the second monomer 12, so that after the first power interface 111 and the second power interface 121 are connected to an external power source, current can flow into the membrane electrode assembly 4 of each monomer, causing the electrolyte in the membrane electrode assembly 4 to undergo an oxidation-reduction reaction to generate hydrogen.

[0097] In such Figure 1 In the illustrated embodiment, both the upper pressing plate 2 and the lower pressing plate 3 include a limiting portion 16 recessed toward the inside of the electrochemical device 1 , and at least a portion of the structure of the connector 10 can be located within the limiting portion 16 .

[0098] In the embodiment of the present application, the connecting piece 10 for connecting the upper end plate 7 and the lower end plate 8 cooperates with the limiting portion 16 of the upper pressure plate 2 and the lower pressure plate 3, so that the connecting piece 10 connects each monomer through the upper pressure plate 2 and the lower pressure plate 3, thereby limiting the separation of the monomer and the connecting piece 10 from each other, which is beneficial to improving the reliability and stability of the connection between the monomer and the connecting piece 10, and further reducing the risk of the monomer being separated from the above-mentioned accommodating space.

[0099] In a specific embodiment, Figure 1 and Figure 3 As shown, the connecting member 10 abuts against the side wall 161 and the bottom wall 162 of the limiting portion 16. A plurality of limiting portions 16 are spaced apart on the periphery of the edge of the upper pressing plate 2 and the lower pressing plate 3, and each connecting member 10 cooperates with the corresponding limiting portion 16 respectively.

[0100] Specifically, Figure 3In the illustrated embodiment, the upper pressing plate 2 and the lower pressing plate 3 are both rectangular structures, and the upper pressing plate 2 and the lower pressing plate 3 have first limiting portions on both sides parallel to the third direction Z, that is, the first limiting portions are recessed along the second direction Y, so that the side walls of the first limiting portions can limit the relative movement of the connector 10 and the monomer along the third direction Z; the upper pressing plate 2 and the lower pressing plate 3 have second limiting portions on both sides parallel to the second direction Y, that is, the second limiting portions are recessed along the third direction Z, so that the side walls of the second limiting portions can limit the relative movement of the connector 10 and the monomer along the second direction Y, which is conducive to improving the reliability of the connection between the connector 10 and the monomer, thereby reducing the risk of the monomer changing its position under the action of external force when the electrochemical device 1 is working, improving the reliability of the electrochemical device 1, and reducing the risk of the monomer escaping from the above-mentioned accommodation space. At the same time, the abutment between the connector 10 and the bottom wall 162 of the limiting portion 16 can reduce the risk of the monomer tipping over, which is conducive to improving the safety of the electrochemical device 1.

[0101] In a specific embodiment, Figure 1 and Figure 2 As shown, the lower pressing plate 3 of the monomer is detachably connected to the upper pressing plate 2 of the adjacent monomer. A first insulating plate 14 is provided between the upper pressing plate 2 of the first monomer 11 and the upper end plate 7, and the first insulating plate 14 is detachably connected to the upper pressing plate 2 of the first monomer 11. A second insulating plate 15 is provided between the lower pressing plate 3 of the second monomer 12 and the lower end plate 8, and the second insulating plate 15 is detachably connected to the lower pressing plate 3 of the second monomer 12.

[0102] Therefore, the lower pressing plate 3 of the monomer and the upper pressing plate 2 of the adjacent monomer are detachably connected, that is, each monomer is detachably connected, and the first monomer 11 is detachably connected to the upper end plate 7 via the first insulating plate 14, and the second monomer 12 is detachably connected to the lower end plate 8 via the second insulating plate 15, so that each monomer can be removed from the upper end plate 7 and the lower end plate 8, which is convenient for replacement and maintenance of each monomer. At the same time, each monomer is detachably connected, so that different numbers of monomers can be stacked along the first direction X according to the actual required hydrogen production, so that different volumes of hydrogen can be generated, which is conducive to improving the applicability of the electrochemical device 1 and better meeting the actual use requirements.

[0103] Specifically, Figure 2 As shown, two adjacent monomers are detachably connected via fasteners 9, the first insulating plate 14 and the upper pressing plate 2 of the first monomer 11 are detachably connected via fasteners 9, the second insulating plate 15 and the lower pressing plate 3 of the second monomer 12 are detachably connected via fasteners 9, and the fasteners 9 are distributed along the diagonal of the electrochemical device 1.

[0104] In the embodiment of the present application, the fastener 9 may be a pin, and each upper pressing plate 2, each lower pressing plate 3, the first insulating plate 14 and the first insulating plate 14 may be provided with a pin hole 91, and the adjacent upper pressing plates 2 and the lower pressing plates 3 are provided with a pin hole 91 on the opposite side along the first direction X, and the pin hole 91 is used to accommodate the fastener 9, so that the adjacent upper pressing plates 2 and the lower pressing plates 3 are detachably connected through the cooperation between the fastener 9 and the pin hole 91, and the adjacent first insulating plate 14 and the upper pressing plate 2 of the first monomer 11, and the second insulating plate 15 and the lower pressing plate 3 of the second monomer 12 are detachably connected through the cooperation between the fastener 9 and the pin hole 91. In this embodiment, when the fasteners 9 between adjacent upper pressure plates 2 and lower pressure plates 3, between adjacent first insulating plates 14 and upper pressure plates 2 of the first monomer 11, and between the second insulating plates 15 and lower pressure plates 3 of the second monomer 12 are worn out and fail due to excessive connections, only the damaged fasteners 9 need to be replaced, without replacing the upper pressure plate 2, the lower pressure plate 3, the first insulating plate 14 and the second insulating plate 15, thereby improving the maintenance efficiency of the staff and reducing the maintenance cost.

[0105] The fasteners 9 are distributed along the diagonal lines of the electrochemical device 1 , further improving the stability of the connection between adjacent monomers.

[0106] In a specific embodiment, Figure 1 , Figure 3 , Figure 4 and Figure 5 As shown, one of the upper pressing plate 2 of each monomer and the lower pressing plate 3 of the adjacent monomer is provided with a recessed portion, and the other is provided with a raised portion, and the adjacent monomers are matched with the raised portion through the recessed portion.

[0107] Therefore, the protrusions and recesses provided can limit the relative movement of the adjacent upper pressing plate 2 and the lower pressing plate 3 along the second direction Y and / or along the third direction Z, further improving the stability of the connection between the two adjacent monomers, reducing the risk of misalignment of the connection between the two adjacent monomers, thereby ensuring that the two adjacent monomers can be smoothly connected, thereby improving the overall structural stability of the electrochemical device 1 and the stability and reliability of the electrochemical device 1 during operation. At the same time, the concave-convex matching relationship between the protrusion and the recess can also play a guiding role in the assembly process, so that the connection between the two adjacent monomers is smoother, and the contact area between the adjacent monomers is increased through the matching of the protrusion and the recess, reducing the contact resistance, thereby reducing the energy consumption of the electrochemical device 1.

[0108] Specifically, Figure 3 , Figure 4 and Figure 5As shown, the first monomer 11 includes a first upper pressing plate 21, a first lower pressing plate 31 and a first membrane electrode assembly 41, and the first lower pressing plate 31 includes a first convex portion 311 distributed at intervals. The second monomer 12 includes a second upper pressing plate 22, a second lower pressing plate 32 and a second membrane electrode assembly 42, and the second upper pressing plate 22 includes a first concave portion 221 distributed at intervals. The monomer also includes at least one third monomer 13 located between the first monomer 11 and the second monomer 12, and the third monomer 13 includes a third upper pressing plate 23, a third lower pressing plate 33 and a third membrane electrode assembly 43, and the third upper pressing plate 23 includes a second concave portion (not shown in the figure) distributed at intervals, and the third lower pressing plate 33 includes a second convex portion 331 distributed at intervals. The first convex portion 311 can cooperate with the second concave portion to limit the relative movement of the first monomer 11 and the third monomer 13, and the second convex portion 331 can cooperate with the first concave portion 221 to limit the relative movement of the second monomer 12 and the third monomer 13, and further improve the stability of each monomer stacking along the first direction X.

[0109] In summary, the electrochemical device 1 can be adjusted according to the actual required hydrogen production by increasing or decreasing the number of the third monomer 13 between the first monomer 11 and the second monomer 12 , which is convenient for practical application.

[0110] In a specific embodiment, Figure 1 As shown, each monomer further includes an insulating rod 6, which connects the upper pressing plate 2 and the lower pressing plate 3 of the same monomer along the first direction X and provides insulation.

[0111] In the embodiment of the present application, the insulating rod 6 is connected to the upper pressing plate 2 at one end along the first direction X, and connected to the lower pressing plate 3 at the other end, and then the upper pressing plate 2 and the lower pressing plate 3 are continuously pressed against the membrane electrode assembly 4 along the first direction X through the insulating rod 6, so that the membrane electrode assembly 4 is more tightly connected with the upper pressing plate 2 and the lower pressing plate 3, which is beneficial to the sealing of the membrane electrode assembly 4, thereby reducing the risk of fluid leakage in the membrane electrode assembly 4, and is beneficial to improving the reliability of the electrochemical device 1 during operation. At the same time, in the stacking process of multiple monomers, the insulating rod 6 can prevent the risk of the upper pressing plate 2, the membrane electrode assembly 4 and the lower pressing plate 3 in each monomer from being offset and loose, thereby improving the reliability of the connection between the upper pressing plate 2, the membrane electrode assembly 4 and the lower pressing plate 3, and playing a certain protective role for each monomer.

[0112] In a specific embodiment, Figure 1As shown, the upper pressing plate 2 and the lower pressing plate 3 of the same monomer are connected by a plurality of insulating rods 6, and each insulating rod 6 is staggered with each connecting member 10. That is, the insulating rods 6 are arranged at the periphery of each monomer, and then the upper pressing plate 2, the membrane electrode assembly 4 and the lower pressing plate 3 inside each monomer are connected more tightly by the plurality of insulating rods 6, so as to further improve the sealing of the membrane electrode assembly 4 and reduce the risk of leakage of the electrochemical device 1. At the same time, the insulating rods 6 are made of insulating material, and the insulating rods 6 are arranged at the periphery of each monomer to reduce the risk of short circuit during electrolysis of the electrochemical device 1, and at the same time can prevent the risk of electric shock, which is conducive to improving the safety of the electrochemical device 1.

[0113] The electrochemical device 1 described in the above embodiments is an electrolyzer or a battery. When the electrochemical device 1 is working, the upper end plate 7, the lower end plate 8 and the monomer are connected through the connectors 10 to improve the stacking stability of the components in the electrochemical device 1 along the first direction X. At the same time, the upper end plate 7 and the lower end plate 8 can clamp the membrane electrode assembly 4 in each monomer, reduce the risk of fluid leakage in the membrane electrode assembly 4, and effectively reduce the energy consumption of the electrochemical device 1.

[0114] When the electrochemical device 1 is an electrolytic cell, such as Figure 1 , Figure 3 , Figure 4 , Figure 5 , Figure 6 As shown, the upper end plate 7 and the upper and lower pressing plates 2 and 3 of each monomer have a cathode interface 19 and an anode interface 18. The anode interface 18 is used to provide a water supply interface, and the cathode interface 19 is used to provide a hydrogen flow interface. Figure 7 As shown, each anode interface 18 is interconnected along the first direction X to form an anode channel 181, and each cathode interface 19 is interconnected along the first direction X to form a cathode channel 191. The membrane electrode assembly 4 is distributed around the anode channel 181 and the cathode channel 191. When the anode interface 18 is fed with fluid, the fluid flows through the anode channel 181 and undergoes oxidation-reduction reaction through the membrane electrode assembly 4 in each monomer, so that hydrogen can be generated and circulated in the cathode channel 191.

[0115] In addition, in a specific embodiment, Figure 3 , Figure 4 , Figure 5As shown, a seal 5 is provided on the periphery of the cathode interface 19 and the anode interface 18 of each monomer to block the connection between the anode interface 18 and the cathode interface 19 and the external environment, thereby avoiding the possibility of leakage of the fluid during the flow process, and a flow port adjacent to the cathode interface 19 and the anode interface 18 is provided next to the cathode interface 19 and the anode interface 18, and the seal 5 is used for the adjacent flow ports, thereby avoiding the possibility of cross-flow of the fluid when flowing through the connection of the two adjacent monomers, and reducing the possibility of the fluid leaking to the outside of the electrochemical device 1 through the connection of the two adjacent monomers. At the same time, the adjacent upper pressing plate 2, the lower pressing plate 3 and the upper end plate 7 and the upper pressing plate 2 of the first monomer 11 adjacent to them can also squeeze the seal 5 to elastically deform the seal 5, thereby further improving the sealing of the electrochemical device 1.

[0116] In a specific embodiment, a sealing groove 51 for installing the seal 5 is provided on the periphery of the cathode interface 19 and the anode interface 18 of each monomer to reduce the possibility of misalignment of the seal 5 during the assembly of each monomer and improve the installation stability of the seal 5 .

[0117] The above is only a specific implementation of the embodiment of the present application, but the protection scope of the embodiment of the present application is not limited thereto, and any changes or replacements within the technical scope disclosed in the embodiment of the present application should be included in the protection scope of the embodiment of the present application. Therefore, the protection scope of the embodiment of the present application should be based on the protection scope of the claims.

Claims

1. An electrochemical device, characterized in that The electrochemical device comprises: upper end plate and lower end plate; A plurality of monomers, wherein the plurality of monomers are stacked between the upper end plate and the lower end plate along a first direction; A connecting member, the connecting member is located at the outer periphery of the monomer, and along a first direction, one end of the connecting member is detachably connected to the upper end plate, and the other end of the connecting member is detachably connected to the lower end plate; The connecting member abuts against the monomer.

2. The electrochemical device according to claim 1, characterized in that Each of the monomers has an upper pressing plate and a lower pressing plate, and the upper pressing plate and the lower pressing plate both include a limiting portion recessed into the interior of the electrochemical device, and at least a part of the structure of the connecting member can be located in the limiting portion.

3. The electrochemical device according to claim 2, characterized in that The connecting member abuts against both the side wall and the bottom wall of the limiting portion.

4. The electrochemical device according to claim 1, characterized in that The connecting member comprises a first protrusion, a second protrusion and a connecting rod connected to each other, wherein the first protrusion and the second protrusion are located at two ends of the connecting rod along a first direction; The upper end plate has a first limiting groove, the lower end plate has a second limiting groove, the first protrusion is located in the first limiting groove and abuts against the bottom wall of the first limiting groove, and the second protrusion is located in the second limiting groove and abuts against the top wall of the second limiting groove.

5. The electrochemical device according to claim 1, characterized in that The upper end plate and the lower end plate each have a plurality of edge portions, and the edge portions of the upper end plate and the lower end plate are connected by the connecting member.

6. The electrochemical device according to claim 1, characterized in that Each of the monomers comprises an upper pressing plate, a lower pressing plate, an insulating rod and a membrane electrode assembly. Along a first direction, the membrane electrode assembly is located between the upper pressing plate and the lower pressing plate. The insulating rod connects the upper pressing plate and the lower pressing plate of the same monomer along the first direction.

7. The electrochemical device according to claim 6, characterized in that The upper pressing plate and the lower pressing plate of the same single body are connected by a plurality of insulating rods, and each insulating rod is staggered with each connecting member.

8. The electrochemical device according to claim 1, characterized in that Each of the monomers has an upper pressing plate and a lower pressing plate, and the lower pressing plate of the monomer is detachably connected to the upper pressing plate of the adjacent monomer; The monomer includes a first monomer adjacent to the upper end plate and a second monomer adjacent to the lower end plate, a first insulating plate is provided between an upper pressure plate of the first monomer and the upper end plate, and the first insulating plate is detachably connected to the upper pressure plate of the first monomer, a second insulating plate is provided between a lower pressure plate of the second monomer and the lower end plate, and the second insulating plate is detachably connected to the lower pressure plate of the second monomer.

9. The electrochemical device according to claim 8, characterized in that Two adjacent monomers are detachably connected by fasteners, the first insulating plate and the upper pressing plate of the first monomer are detachably connected by the fasteners, the second insulating plate and the lower pressing plate of the second monomer are detachably connected by the fasteners, and the fasteners are distributed along the diagonal of the electrochemical device.

10. The electrochemical device according to claim 8, characterized in that One of the upper pressing plate of each monomer and the lower pressing plate of the monomer adjacent thereto is provided with a recessed portion, and the other is provided with a raised portion, and the adjacent monomers are matched with the raised portion through the recessed portion.

11. The electrochemical device according to any one of claims 1 to 10, characterized in that: The electrochemical device is an electrolyzer or a battery.

Images