An electrochemical device

Abstract

The utility model provides an electrochemical device belongs to electrochemistry technical field, electrochemical device includes: main bearing frame, including interval arrangement's first end plate and second end plate, electrochemical reactor is arranged in main bearing frame, including a plurality of electrochemical reaction unit, electrochemical reaction unit includes cathode mass transfer gas transmission conductive part, membrane electrode and anode mass transfer gas transmission conductive part, insulating plate is arranged between electrochemical reactor and first end plate, parallel top pressure structure is arranged between electrochemical reactor and second end plate, including fixed support part and movable support part, movable support part has the support plane of supporting electrochemical reactor, and the fixed support part and movable support part form the adjustment part for keeping the support plane and electrochemical reactor are in conformity of the ball socket structure and the spherical cap structure between, wherein the diameter of spherical cap structure is less than or equal to ball socket structure, and spherical cap structure and ball socket structure are tangent spherical surface contact. The electrochemical device can realize uniform loading.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electrochemistry, and in particular to an electrochemical device. BACKGROUND

[0002] With the development of economy, the global energy demand increases, and the ecological environment problem is increasingly serious. In recent years, hydrogen is paid attention to due to its high calorific value, environmental friendliness, energy storage flexibility and other characteristics, and gradually gets wide application. There are three ways for water electrolysis to produce hydrogen: alkaline water electrolysis, solid oxide water electrolysis and proton exchange membrane water electrolysis. The solid oxide water electrolysis technology is still in the laboratory stage and has not yet entered commercialization. Compared with the traditional alkaline water electrolysis, the proton exchange membrane water electrolysis has the characteristics of high current density, strong flexibility, high efficiency, large energy capacity and the like, can well match renewable energy, and due to the compact structure, can operate at a high pressure of up to 350 bar, which is conducive to the storage and transportation of hydrogen, can effectively reduce the loss caused by compression and storage, and is the current international research hotspot.

[0003] In order to adapt to the large-scale application of hydrogen energy, the capacity of the electrolysis stack continues to increase, thereby leading to the continuous increase of the reaction area of the electrolysis stack. Among them, the uniform loading of the reaction area pressure of the electrolysis stack is an important influencing factor to ensure the performance of the single stack. The traditional electrolysis stack adopts a four-around screw loading method, which can ensure the uniform loading of the reaction area on the small-area reaction area electrolysis stack. With the continuous increase of the reaction area, the four-around loading method will cause uneven stress on the reaction area and affect its performance. Therefore, it is of great significance to develop a new structure to improve the uniformity of the stress on the reaction area.

[0004] A kind of electrochemical cell stack is disclosed in the Chinese patent application file with publication number CN101253648A, which is a cell stack with at least one electrochemical cell arranged between a first end panel connected to an electric bolt and a second end panel connected to another electric bolt, wherein the cell stack has a housing, means for providing fixed support of the cell stack to the housing, and means for maintaining constant mechanical load on the cell stack, which includes at least one elastic gasket inserted into the space between the cell stack and the housing wall. Although the cell stack can provide constant mechanical load, it is still difficult to achieve uniform loading.

[0005] A Chinese invention patent application with publication number CN116093392A discloses a fuel cell stack structure, including a stack core and a first current collector and a second current collector respectively closely disposed on the upper and lower surfaces of the stack core. The stack structure also includes a disc spring end plate and a stack rear end plate disposed sequentially above the first current collector from bottom to top. The disc spring end plate contains a stack-compression disc spring. When a downward pressure is applied to the stack rear end plate, the stack rear end plate applies a stack-compression force to the stack-compression disc spring, thereby applying a stack-compression force to the stack core. However, the installation process of this solution remains inconvenient. Summary of the Invention

[0006] The present invention provides an electrochemical device in order to at least partially solve the above-mentioned technical problems.

[0007] As one aspect of the present invention, an electrochemical device is provided, comprising:

[0008] The main load-bearing frame includes a first end plate and a second end plate spaced apart.

[0009] An electrochemical reactor is located within the main load-bearing frame and includes several electrochemical reaction units, each of which includes a cathode mass transfer and gas transport conductive component, a membrane electrode, and an anode mass transfer and gas transport conductive component.

[0010] An insulating plate is disposed between the electrochemical reactor and the first end plate, and / or between the electrochemical reactor and the second end plate;

[0011] A parallel top pressure structure is disposed between the electrochemical reactor and the second end plate, including a fixed support part and a movable support part. The movable support part has a support plane that contacts and supports the electrochemical reactor. An adjustment part is formed between the fixed support part and the movable support part, consisting of a ball-and-socket structure and a ball-and-cap structure that cooperate with each other to keep the support plane in contact with the electrochemical reactor. The diameter of the ball-and-cap structure is less than or equal to the diameter of the ball-and-socket structure, and the ball-and-cap structure and the ball-and-socket structure are in tangential spherical contact.

[0012] It also includes an elastic device, which is disposed between the electrochemical reactor and the second end plate and is capable of applying an elastic clamping force to the electrochemical reactor.

[0013] The device further comprises a pressing device; the first end plate is provided with a first through hole; the pressing device comprises a pressing head and a stop piece; the pressing head, the elastic device and the electrochemical reactor are arranged between the first end plate and the second end plate, and the pressing head is located on the side close to the first end plate; the pressing head can be displaced to the side of the electrochemical reactor and the elastic device under the extrusion of the pressing rod of the press inserted into the first through hole, and the elastic device can exert elastic pressing force on the electrochemical reactor; the stop piece can be inserted between the pressing head and the first end plate after the displacement of the pressing head, so as to prevent the pressing head from returning to the original position and maintain the elastic pressing force.

[0014] The elastic device is arranged on the side close to the second end plate, and the elastic device comprises a central guide rod and a plurality of stacked disc springs; one end of the central guide rod is provided with a flat plate support part for contacting the electrochemical reactor; the disc springs are sleeved on the central guide rod and located between the flat plate support part and the second end plate and can be extruded by the flat plate support part and the second end plate; the second end plate is provided with a relief hole for inserting the central guide rod.

[0015] The movable support part is provided with a spherical crown structure, and the fixed support part is provided with a ball socket structure matched with the spherical crown structure; the spherical crown structure is inserted into the ball socket structure.

[0016] The pressing head has a parallel planar pressing surface and a planar stop surface; the planar pressing surface is used to exert pressure on the electrochemical reactor and the elastic device; the planar stop surface is used to contact the stop piece; the planar stop surface is provided with a central pressing column for contacting the pressing rod; the pressing column is inserted into the first through hole.

[0017] The pressing device further comprises a guide mechanism arranged between the first end plate and the pressing head; the guide mechanism comprises a guide bottom plate and a through guide cylinder vertically arranged on the guide bottom plate; the guide cylinder is inserted into the first through hole; the pressing column is slidably inserted into the guide cylinder; and the stop piece can be inserted between the guide bottom plate and the pressing head.

[0018] The pressing head is a frustum structure, and the planar pressing surface is tapered to the planar stop surface.

[0019] The stop piece comprises a flat stop piece body and a handle for holding; the stop piece body is provided with an open slot for avoiding the pressing column; and the opening of the open slot is located at the edge of the stop piece body away from the handle.

[0020] The first end plate and the second end plate are fixedly connected through a plurality of screw rods, and both ends of the screw rod are provided with nuts located on both sides of the first end plate and the second end plate.

[0021] Based on the above scheme, the electrochemical device has at least one of the following beneficial effects relative to the prior art:

[0022] When the first end plate and the second end plate clamp the electrochemical reactor, the fixed support part and the movable support part of the parallel top pressing structure form a structure that can rotate in any direction and is single-point supported due to the existence of the ball socket structure and the spherical cap structure between the fixed support part and the movable support part. Therefore, when the electrochemical reactor and the main bearing frame are unevenly loaded, the support surface of the movable support part is always parallel to the electrochemical reactor through the relative rotation between the fixed support part and the movable support part, and the movable support part vertically applies pressure to the electrochemical reactor, so that the electrochemical reactor is parallel to the first end plate, thereby realizing uniform loading of the electrochemical reactor and uniform stress on the reaction area. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the present application, the drawings required in the embodiments will be briefly introduced below.

[0024] Figure 1 is a schematic diagram of an electrochemical device according to an embodiment of the present application;

[0025] Figure 2 is a cross-sectional view of the parallel top pressing structure in Figure 1

[0026] Figure 3 is a schematic diagram of an electrochemical device according to another embodiment of the present application;

[0027] Figure 4 is a schematic diagram of an electrochemical device according to still another embodiment of the present application;

[0028] Figure 5 is a structural schematic diagram of the first end plate in Figure 4

[0029] Figure 6 is a structural schematic diagram of the pressing head and the stopper in Figure 4

[0030] Figure 7 is a structural schematic diagram of the pressing head and the stopper cooperating with each other;

[0031] Figure 8 is a structural schematic diagram of the pressing head;

[0032] Figure 9 is​​​Figure 8 schematic view from another angle;

[0033] Figure 10 is a front view of the stopper;

[0034] Figure 11 is a schematic view of the guide mechanism cooperating with the pressing head and the stopper;

[0035] Figure 12 is a schematic view of the structure of the guide mechanism;

[0036] Figure 13 is a schematic view of the structure of the central guide rod;

[0037] Figure 14 is an exploded schematic view of the central guide rod;

[0038] Figure 15 is Figure 14 schematic view from another angle.

[0039] In the above drawings, the meanings of the reference signs are as follows:

[0040] In the drawings: 11, first end plate; 110, first through hole; 111, mounting hole; 12, second end plate; 13, screw rod; 14, nut; 2, parallel pressing structure; 20, elastic device; 21, central guide rod; 210, flat plate support part; 211, fixed support part; 212, movable support part; 2121, support plane; 213, ball socket structure; 214, spherical crown structure; 22, disc spring; 31, pressing head; 311, flat pressing surface; 312, flat stop surface; 313, pressing column; 32, stopper; 321, stopper body; 322, handle; 323, open slot; 33, guide mechanism; 331, guide bottom plate; 332, guide cylinder; 4, electrochemical reactor; 40, insulating plate; 41, electrochemical reaction unit. DETAILED DESCRIPTION

[0041] In order to better understand the technical solutions of the embodiments of the present application, the embodiments of the present application will be described in detail below with reference to the drawings.

[0042] It should be clear that the described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the embodiments of the present application.

[0043] As Figure 1 and Figure 2As shown, the embodiment of the present application discloses an electrochemical device. The electrochemical device can be a fuel cell or a water electrolysis hydrogen production device. The electrochemical device comprises a main bearing frame, an electrochemical reactor 4, an insulation plate 40 and a parallel top pressing structure 2.

[0044] The main bearing frame comprises a first end plate 11 and a second end plate 12 arranged at intervals, and the first end plate 11 and the second end plate 12 are fixedly connected by a plurality of screw rods. The first end plate 11 and the second end plate 12 are substantially at the outermost ends of the overall structure of the electrochemical device, and after assembly, the first end plate 11 and the second end plate 12 are substantially parallel to each other as a whole.

[0045] The electrochemical reactor 4 is arranged in the main bearing frame and is clamped between the first end plate 11 and the second end plate 12. The electrochemical reactor 4 comprises a plurality of electrochemical reaction units 41. The electrochemical reaction unit 41 comprises a cathode mass transfer gas conducting and electrically conducting component, a membrane electrode and an anode mass transfer gas conducting and electrically conducting component. The structure of the electrochemical reaction unit is the existing structure. In some embodiments, the electrochemical device is arranged as a fuel cell, at this time the electrochemical reaction unit 41 is a fuel cell stack, hydrogen and oxygen are introduced into the electrochemical reaction unit 41, hydrogen is decomposed into hydrogen ions and electrons under the action of a catalyst at the anode mass transfer gas conducting and electrically conducting component, the electrons enter the external circuit to form a current to drive the load, and the hydrogen ions move to the cathode mass transfer gas conducting and electrically conducting component. Oxygen combines with hydrogen ions and electrons flowing from the external circuit at the cathode mass transfer gas conducting and electrically conducting component to generate water. In some embodiments, the electrochemical device is arranged as a water electrolysis hydrogen production device, and the electrochemical reaction unit 41 is an electrolysis stack, such as a PEM electrolysis stack. At this time, water is added to the electrochemical reaction unit 41, oxygen is generated in the anode mass transfer gas conducting and electrically conducting component, and hydrogen is generated in the cathode mass transfer gas conducting and electrically conducting component. Oxygen and hydrogen are collected by an oxygen storage tank and a hydrogen storage tank, respectively.

[0046] The insulation plate 40 is arranged between the electrochemical reactor 4 and the first end plate 11, and / or between the electrochemical reactor and the second end plate, and serves as an insulating function. The number of insulation plates 40 can be one or more.

[0047] The parallel top pressing structure 2 is arranged between the electrochemical reactor 4 and the second end plate 12, and comprises a fixed support part 211 and a movable support part 212. The fixed support part 211 and the movable support part 212 are both disc-shaped structures. The movable support part 212 has a support surface for contacting and supporting the electrochemical reactor 4. The movable support part 212 can directly contact and support the electrochemical reactor 4 through the support surface, or indirectly contact.

[0048] The adjusting part for keeping the support plane in contact with the electrochemical reactor 4 is formed between the fixed support part 211 and the movable support part 212 by the mutually matched ball socket structure 213 and the spherical cap structure 214. The diameter of the spherical cap structure 214 is less than or equal to the diameter of the ball socket structure 213, and the spherical cap structure 214 is in tangential spherical surface contact with the ball socket structure 213.

[0049] When the first end plate 11 and the second end plate 12 clamp the electrochemical reactor 4, the fixed support part 211 and the movable support part 212 of the parallel top pressing structure are substantially formed into a structure that can rotate in any direction and is single-point supported due to the existence of the ball socket structure 213 and the spherical cap structure 214. Thus, when the electrochemical reactor and the main load-bearing frame are not uniformly loaded and the reaction area is not uniformly stressed or the first end plate and the second end plate are not parallel, i.e., the peripheral distance difference between the two end plates is within 1 mm, the support surface of the movable support part 212 is kept parallel to the electrochemical reactor 4 by the relative rotation between the fixed support part 211 and the movable support part 212, and the movable support part 212 vertically applies pressure to the electrochemical reactor 4, so that the electrochemical reactor 4 is kept parallel to the first end plate 11, thereby realizing uniform loading of the electrochemical reactor 4 and uniform stress on the reaction area.

[0050] As shown in Figure 3 , in an embodiment, an elastic device 20 can also be included. The elastic device 20 is arranged between the electrochemical reactor 4 and the second end plate 12 and can apply elastic pressing force to the electrochemical reactor 4. The elastic device 20 can be selected from disc springs, elastic sheets, etc. After the elastic device 20 is arranged, elastic pressing force can be applied by the elastic device 20, and certain vibrations can be absorbed by the elastic device 20, thereby improving the damping effect.

[0051] As shown in Figures 4 to 15 , in another embodiment of the present application, a pressurizing device is further arranged. As shown in Figure 5As shown, a mounting hole 111 is arranged around the first end plate 11, and a mounting hole is arranged on the second end plate 12, a screw rod 13 is inserted into the mounting holes of the first end plate 11 and the second end plate 12, and nuts 14 are arranged on both ends of the screw rod 13 and located on both sides of the first end plate 11 and the second end plate 12, so that the first end plate 11 and the second end plate 12 are fixed and integrated by the screw rod 13 and the nuts 14. When the first end plate 11 and the second end plate 12 are fixed, corresponding clamps or other tools can be arranged to first position the first end plate 11 and the second end plate 12, so as to ensure that the two plates maintain a high parallelism requirement. An electrochemical reactor 4 is arranged between the first end plate 11 and the second end plate 12, and the electrochemical reactor 4 includes a plurality of electrochemical reaction unit 41 structures. The first end plate and the second end plate can also be fixed and integrated by welding or other connection methods. The screw rod can also be replaced by a common structure such as a cylinder. A first through hole 110 is arranged at the center of the first end plate 11.

[0052] The pressing device includes a pressing head 31 and a stop piece 32. The pressing head 31, the elastic device 20 and the electrochemical reactor 4 are arranged between the first end plate 11 and the second end plate 12. The pressing head 31 is located on the side close to the first end plate 11. The pressing head 31 can be displaced to one side of the electrochemical reactor 4 and the elastic device 20 under the extrusion of the pressing rod of the press inserted into the first through hole 110, and the elastic device can exert an elastic pressing force on the electrochemical reactor 4. The stop piece 32 can be inserted between the pressing head 31 and the first end plate 11 after the displacement of the pressing head 31, and can prevent the pressing head 31 from returning to the original position to maintain the elastic pressing force.

[0053] The electrochemical device of the embodiment of the present application further pushes the pressing head 31 to move through the extrusion of the pressing rod of the press on the pressing head 31. The pressing head 31 only receives pressure at one point because it only has one contact point with the pressing rod of the press, thereby avoiding the problem of uneven loading caused by the fact that the pressures at different points are not completely the same in size and direction when multiple points are subjected to force, and more uniform loading can be achieved. After the pressing head 31 is pressed, the stop piece 32 is inserted to prevent the pressing head 31 from returning to the original position, which is simple and fast, and only needs to insert the stop piece 32 between the pressing head 31 and the first end plate 11. Compared with the operation of tightening the nuts of multiple screw rods in the prior art, the installation speed is greatly improved. The press is used for pressing, which can achieve accurate pressure control and improve work efficiency and reduce the labor intensity of workers compared with the loading method of manually tightening the nuts on the screw rod. By arranging the elastic device, the electrochemical reactor can be continuously subjected to an elastic pressing force, and automatic compensation can be performed after the nuts are loosened, thereby reducing the risk of leakage caused by the loosening of the nuts and the reduction of the compression load during production, and further improving the production efficiency and safety.

[0054] As Figures 6 to 9 shown, in particular in the present embodiment, the pressing head 31 is a truncated cone structure with a large upper part and a small lower part, and its structure is roughly center-shaped. The pressing head 31 has two parallel plane structures, which are the plane pressing surface 311 and the plane stop surface 312, respectively. The plane pressing surface 311 is essentially the bottom surface of the truncated cone, and the plane stop surface 312 is essentially the top surface of the truncated cone. The plane pressing surface 311 transitions to the plane stop surface 312. By setting the truncated cone structure, the weight can be effectively reduced while ensuring the height of the truncated cone. Of course, in other embodiments of the present application, the pressing head 31 can also be a flat plate structure or other structures.

[0055] The plane pressing surface 311 is used to apply pressure to the electrochemical reactor 4 and the elastic device, and the plane stop surface 312 is used to contact the stop sheet 32. The plane stop surface 312 is provided with a pressing column 313 located at the center for contacting the pressing rod of the press, and the pressing column 313 is inserted into the first through hole 110.

[0056] As Figure 10 shown, the stop sheet 32 is a sheet body, which includes a flat stop sheet body 321 and a handle 322 for holding. When assembling, the stop sheet 32 can be held by holding the handle 322, so as to be assembled. Further, the stop sheet body 321 is provided with an opening slot 323 avoiding the pressing column 313, and the opening of the opening slot 323 is located at the edge of the side of the stop sheet body 321 away from the handle 322. When assembling, the opening slot 323 is aligned with the pressing column 313, and then the stop sheet 32 is inserted. By setting the opening slot 323, the interference of the pressing column 313 to the stop sheet 32 can be avoided, the area of the stop sheet 32 is increased, so that it is better matched with the plane stop surface 312 of the pressing head 31, and the stability is improved. Those skilled in the art understand that the pressing column 313 is used to contact the pressing rod of the press, so as to reduce the descending distance of the pressing rod. In addition to the structure of the pressing column, a positioning slot or other structure can be provided on the pressing head 31 to cooperate with the pressing rod of the press. The pressing head 31 can also be set to form a sliding fit with the screw rod, so as to improve the stability of the pressing head 31 and ensure that it smoothly moves without being randomly detached.

[0057] As Figure 11 and Figure 12 shown, further, the pressing device can also include a guide mechanism 33 provided between the first end plate 11 and the pressing head 31. The guide mechanism 33 includes a guide bottom plate 331 and a through guide cylinder 332 vertically provided on the guide bottom plate 331, the guide cylinder 332 can be inserted into the first through hole 110, the pressing column 313 is slidably inserted into the guide cylinder 332, and the stop sheet 32 can be inserted between the guide bottom plate 331 and the pressing head 31.

[0058] The guiding bottom plate 331 is a flat plate structure, and its two surfaces can contact the surface of the first end plate 11 and the stopper 32 respectively. The guiding cylinder 332 can be set to a longer length, and when it is inserted into the first through hole 110 of the first end plate 11, the free end of the guiding cylinder 332 can protrude from the first through hole 110, so that the slidable range of the pressing column 313 of the pressing head 31 can be effectively extended in the case that the thickness of the first end plate 11 is small, so that the overall weight can be reduced by reducing the thickness of the first end plate 11.

[0059] In combination Figure 4 , Figures 13 to 15 In this embodiment, the elastic device is arranged on the side close to the second end plate 12. The elastic device includes a center guide rod 21 and a plurality of stacked disc springs 22. One end of the center guide rod 21 is provided with a flat plate support portion 210 for contacting the electrochemical reactor 4, the disc springs 22 are sleeved on the center guide rod 21 and located between the flat plate support portion 210 and the second end plate 12 and can be pressed by the flat plate support portion 210 and the second end plate 12, and the second end plate 12 is provided with a relief hole for inserting the center guide rod 21.

[0060] The flat plate support portion 210 specifically includes a fixed support portion 211 and a movable support portion 212. The movable support portion 212 has a support plane 2121 for contacting the electrochemical reactor 4, and the fixed support portion 211 and the movable support portion 212 form an adjusting portion composed of a ball and socket structure 213 and a spherical cap structure 214 for keeping the support plane 2121 in close contact with the electrochemical reactor 4.

[0061] The fixed support portion 211 and the movable support portion 212 are both disc structures, the fixed support portion 211 is arranged integrally with the center guide rod 21, and the movable support portion 212 is in contact with the fixed support portion 211 through the adjusting portion and can slide relatively. The support plane 2121 of the movable support portion 212 can closely contact the electrochemical reactor 4 in a large area and uniformly transmit the pressure. In other embodiments of the application, the fixed support portion 211 can also be arranged separately from the center guide rod 21. In this way, the flat plate support portion 210 and the center guide rod 21 can be manufactured separately and arranged on both sides of the electrochemical reactor 4 respectively.

[0062] In this embodiment, the movable support portion 212 is provided with the spherical cap structure 214, the fixed support portion 211 is provided with the ball and socket structure 213 matched with the spherical cap structure 214, and the spherical cap structure 214 is inserted into the ball and socket structure 213.

[0063] In other embodiments of the present application, the fixed support part 211 is provided with a spherical cap structure 214, and the movable support part 212 is provided with a spherical socket structure 213 matching the spherical cap structure 214, and the spherical cap structure 214 is inserted into the spherical socket structure 213.

[0064] The diameters of the spherical cap structure 214 and the spherical socket structure 213 are generally set to be equal, so that theoretically a spherical surface contact can be formed between the spherical cap structure 214 and the spherical socket structure 213. Further, the diameter of the spherical cap structure 214 can be set to be smaller than that of the spherical socket structure 213, so that a point contact is formed between the spherical cap structure 214 and the spherical socket structure 213, and the two are more easily rotated relative to each other. In the present embodiment, the diameter of the spherical cap structure 214 is 1040 mm, and the diameter of the spherical socket structure 213 is 1200 mm. By setting in this way, it can be avoided that the spherical cap structure and the spherical socket structure cannot rotate due to fitting problems caused by machining errors and the like.

[0065] By setting the adjusting part, when the press head 31 is pressed down by the press, the support plane 2121 of the movable support part 212 can automatically rotate under the pressure of the press, so that the support plane 2121 is perpendicular to the pressing direction of the press, further ensuring that the electrochemical reactor is subjected to uniform load.

[0066] By setting the disc spring 22 on the center guide rod 21, the disc spring 22 can be compressed using the fixed support part 211 on the center guide rod 21, and the overall structure is compact. The disc spring 22 can store a large amount of elastic potential energy under a small deformation, and the elastic potential energy can be automatically converted into compression load to provide additional pre-tightening force for the nut, which helps to maintain the pressure between the parts, meet the sealing requirements, and prevent the loosening of fasteners such as bolts and nuts under vibration or alternating load.

[0067] The disc spring has good shock absorption and vibration absorption capacity, and can absorb and disperse external force by its elastic deformation when the nut is subjected to impact or vibration. This helps to protect the nut and adjacent parts from damage, while improving the stability and reliability of the entire system.

[0068] The automatic compensation function of the disc spring also reduces the risk of leakage caused by bolt loosening and reduced compression load during production, further improving production efficiency and safety.

[0069] The above only describes the preferred embodiments of the present application, and is not intended to limit the embodiments of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the embodiments of the present application shall be included in the scope of protection of the embodiments of the present application.

Claims

1. An electrochemical device, characterized by, The application relates to a main bearing frame, an electrochemical reactor, an insulating plate, a parallel top pressing structure, an elastic device and a pressing device. The main bearing frame comprises a first end plate and a second end plate arranged at intervals. The electrochemical reactor is arranged in the main bearing frame and comprises a plurality of electrochemical reaction units, wherein each electrochemical reaction unit comprises a cathode mass transfer gas conducting and electrically conducting component, a membrane electrode and an anode mass transfer gas conducting and electrically conducting component. The insulating plate is arranged between the electrochemical reactor and the first end plate and / or between the electrochemical reactor and the second end plate. The parallel top pressing structure is arranged between the electrochemical reactor and the second end plate and comprises a fixed support part and a movable support part, wherein the movable support part has a support plane which contacts and supports the electrochemical reactor, the fixed support part and the movable support part form an adjusting part for keeping the support plane in close contact with the electrochemical reactor, the adjusting part is composed of a ball socket structure and a spherical cap structure which are matched with each other, the diameter of the spherical cap structure is less than or equal to the diameter of the ball socket structure, the spherical cap structure and the ball socket structure are in tangential spherical surface contact, and the fixed support part and the movable support part form a single-point supporting structure.

2. The electrochemical device of claim 1, wherein The elastic device is arranged between the electrochemical reactor and the second end plate and can apply an elastic pressing force to the electrochemical reactor.

3. The electrochemical device of claim 1, wherein The pressing device comprises a pressing head and a stop sheet, the first end plate is provided with a first through hole, the pressing head, the elastic device and the electrochemical reactor are arranged between the first end plate and the second end plate, the pressing head is located on the side close to the first end plate, the pressing head can be displaced to the side of the electrochemical reactor and the elastic device and apply an elastic pressing force to the electrochemical reactor under the extrusion of a pressing rod of a press inserted into the first through hole, and the stop sheet can be inserted between the pressing head and the first end plate after the displacement of the pressing head to prevent the pressing head from returning to the original position and keep the elastic pressing force.

4. The electrochemical device of claim 3, wherein, The elastic device is arranged on the side close to the second end plate, the elastic device comprises a central guide rod and a plurality of stacked disc springs, one end of the central guide rod is provided with a flat plate support part for contacting the electrochemical reactor, the disc springs are sleeved on the central guide rod and are located between the flat plate support part and the second end plate and can be extruded by the flat plate support part and the second end plate, and the second end plate is provided with a avoiding hole for inserting the central guide rod.

5. The electrochemical device of claim 4, wherein, The movable support part is provided with a spherical cap structure, the fixed support part is provided with a ball socket structure matched with the spherical cap structure, and the spherical cap structure is inserted into the ball socket structure.

6. The electrochemical device of claim 3, wherein The pressing head has a parallel planar pressing surface and a planar stop surface, the planar pressing surface is used for applying pressure to the electrochemical reactor and the elastic device, the planar stop surface is used for contacting the stop sheet, the planar stop surface is provided with a pressing column located at the center for contacting the pressing rod, and the pressing column is inserted into the first through hole.

7. The electrochemical device of claim 6, wherein The pressing head has a frustum structure, and the planar pressing surface is shrunk and transitioned to the planar stop surface.

8. The electrochemical device of claim 6, wherein The pressing device further comprises a guide mechanism arranged between the first end plate and the pressing head, the guide mechanism comprising a guide base plate and a through guide cylinder vertically arranged on the guide base plate, the guide cylinder being inserted into the first through hole, the pressing column being slidably inserted into the guide cylinder, and the stopper plate being capable of being inserted between the guide base plate and the pressing head.

9. The electrochemical device of claim 6, wherein, The stopper plate comprises a flat stopper plate body and a handle for holding, and the stopper plate body is provided with an open slot for avoiding the pressing column, the opening of the open slot being located at the edge of the stopper plate body away from the handle.

10. The electrochemical device of claim 1, wherein The first end plate and the second end plate are fixedly connected by a plurality of screw rods, and both ends of each screw rod are provided with nuts located on both sides of the first end plate and the second end plate.

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