Mechanical trimming structure for trimming fuel cell cathode plate

Abstract

The utility model discloses a mechanical trimming structure for trimming a cathode plate of a fuel cell. The mechanical trimming structure comprises a straight plate, a shell, a fixed cover plate, a movable cover plate and a tempering structure, a cathode plate fixing structure is mounted on the straight plate; a containing groove allowing the cathode clamping plate to slide is formed in the shell, the fixed cover plate is fixedly installed at one end of the shell, the movable cover plate is in sliding fit with the shell, one end of the movable cover plate abuts against the fixed cover plate, and the fixed cover plate and the movable cover plate are located above the cathode plate. The shell, the cathode clamping plate, the fixed cover plate and the movable cover plate form a cathode plate assembling and disassembling shell; and the tempering structure comprises a tempering box body, a shelf is arranged in the tempering box body, the cathode plate loading and unloading shell is placed on the shelf, and an opening is formed in the shell and is opposite to the placement groove. The structure is simple and compact, the occupied space is small, the bent cathode plate can be effectively trimmed, the assembly problem of the fuel cell is solved, and the performance of the fuel cell is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of fuel cells, in particular to a mechanical trimming structure for trimming a cathode plate of a fuel cell. Background Art

[0002] A fuel cell is a chemical device that converts the chemical energy of a fuel directly into electrical energy. The cathode plate of a fuel cell is an important component of a fuel cell system. Metal cathode plates are more suitable for mass production due to their high thermal and electrical conductivity, superior mechanical properties, and low cost. They can be made from ultra-thin metal coils. The main materials used to process metal cathode plates are stainless steel, nickel-based alloys, metal oxides, etc.

[0003] The metal cathode plate used in proton exchange membrane fuel cells is a thin metal plate processed and prepared by stamping or bending forming technology. However, the metal cathode plate itself has the disadvantage of being easily corroded. After the metal ions generated by the corrosion of the metal plate enter the battery, they can cause catalyst poisoning and reduce the hydrogen ion conductivity of the proton exchange membrane. Therefore, metal cathode plates made of metal materials, such as stainless steel plates, need to be treated with physical meteorological deposition coating. This process is completed at a certain temperature and air pressure, and the cathode corrugated plate will bend. The bending of the metal cathode plate will cause the consistency of the single cells that make up the stack to deteriorate, affecting the uniform distribution of current on the cathode plate. After bending, the microstructure of the metal cathode plate changes, resulting in changes in the migration path of oxygen and water. At the same time, it has an adverse effect on the realization of automated assembly of the stack, which will deteriorate the reaction conditions of some electrode units, thereby affecting the performance of the entire fuel cell, accelerating the wear of the catalyst layer, increasing contact resistance, and reducing structural strength. Summary of the invention

[0004] In view of the above-mentioned deficiencies of the prior art, the technical problem to be solved by this patent application is how to provide a mechanical trimming structure for trimming the cathode plate of a fuel cell which has a simple and compact structure, occupies a small space, improves the assembly problem of the fuel cell, and improves the performance of the fuel cell.

[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0006] A mechanical trimming structure for trimming a cathode plate of a fuel cell, comprising a straight plate, a shell, a fixed cover plate, a movable cover plate and a tempering structure;

[0007] The straight plate is provided with a cathode plate fixing structure, and the cathode plate is fixedly mounted on the straight plate through the cathode plate fixing structure to form a cathode clamping plate;

[0008] The shell is provided with a placement groove for allowing the cathode clamping plate to slide, the fixed cover plate is fixedly installed at one end of the shell, the movable cover plate is slidably matched with the shell and one end is abutted against the fixed cover plate, the fixed cover plate and the movable cover plate are located above the cathode plate, and the shell, the cathode clamping plate, the fixed cover plate and the movable cover plate constitute a cathode plate loading and unloading shell;

[0009] The tempering structure comprises a tempering box body, a shelf is arranged in the tempering box body, the cathode plate loading and unloading shell is placed on the shelf shelf, and the shell body is provided with an opening facing the placement groove.

[0010] Preferably, the cathode plate fixing structure comprises a corrugated structure provided at one end and the middle of the straight plate, the corrugated structure is conformed to the cathode plate flow channel, and the cathode plate is connected to the straight plate via a polytetrafluoroethylene ring.

[0011] Preferably, the corrugated structure includes at least three rectangular structures conforming to the shape of the cathode plate flow channel.

[0012] Preferably, the fixed cover plate is fixedly connected to the shell by screws.

[0013] Preferably, rollers are installed at both ends of the fixed cover plate.

[0014] Preferably, guide grooves are provided on both sides of the shell, and protrusions are provided on both sides of the movable cover plate to slideably cooperate with the guide grooves.

[0015] Preferably, three drawer-type shelves are provided in the tempering box.

[0016] Preferably, a handle is fixed to one side of the shell.

[0017] In summary, the mechanical trimming structure for trimming the cathode plate of the fuel cell is provided with a cathode clamping plate, on which a rectangular structure is fitted with the curved cathode plate flow channel, and a polytetrafluoroethylene ring is used to fix the curved cathode plate to prevent the cathode plate from being separated from the cathode clamping plate and undergoing secondary bending. The cathode clamping plate fixed with the curved cathode plate can be smoothly pushed into the designated position along the placement groove, and at the same time, the roller installed on the fixed cover plate facilitates the smooth movement of the cathode clamping plate to the designated position, effectively preventing the cathode corrugated plate film coating from being damaged. The fixed cover plate is fixed to the shell by screw connection, and adjustment gaskets of different thicknesses are placed between the placement groove and the fixed cover plate to adapt to the trimming of the bending deformation of the cathode plate of different heights. Considering that the bending of the cathode plate will be repeated during the mechanical structure trimming and the bending problem of the cathode plate cannot be solved, the present invention designs a tempering box to address this problem, and the bending internal stress of the cathode plate to be trimmed is eliminated through tempering and completely repaired. In order to improve the tempering efficiency and realize the tempering treatment of multiple curved cathode plates at the same time, the tempering box structure designed by the present invention has three shelves, which can realize the tempering treatment of three curved cathode plates at the same time. If necessary, the number of shelves can be increased. The invention has a simple and compact structure and occupies a small space. It can effectively trim the curved cathode plates, improve the assembly problem of the fuel cell and improve the performance of the fuel cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic diagram of the bent state of the cathode plate to be trimmed.

[0019] Figure 2 The utility model is a structural schematic diagram of a mechanical trimming structure for trimming a cathode plate of a fuel cell.

[0020] Figure 3 Schematic diagram of loading and unloading the cathode plate shell.

[0021] Figure 4 for Figure 3 Schematic diagram after removing the movable cover.

[0022] Figure 5 A schematic diagram of the shell.

[0023] Figure 6 Schematic diagram of cathode clamping plate.

[0024] Figure 7 A schematic diagram of a straight board. DETAILED DESCRIPTION

[0025] The present invention is further described in detail below in conjunction with the accompanying drawings. In the description of the present invention, it should be understood that the directions or positional relationships indicated by directional words such as "upper, lower" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description. Unless otherwise stated, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present invention; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0026] like Figure 1-7 As shown, a mechanical trimming structure for trimming a cathode plate 1 of a fuel cell comprises a straight plate 2, a shell 3, a fixed cover plate 4, a movable cover plate 5 and a tempering structure;

[0027] The straight plate is provided with a cathode plate fixing structure, and the cathode plate is installed on the straight plate through the cathode plate fixing structure to form a cathode clamping plate;

[0028] The housing 3 is provided with a placement groove 6 for allowing the cathode clamping plate to slide, the fixed cover plate is fixedly installed at one end of the housing, the movable cover plate is slidably matched with the housing and one end is abutted against the fixed cover plate, the fixed cover plate and the movable cover plate are located above the cathode plate, and the housing, the cathode clamping plate, the fixed cover plate and the movable cover plate constitute a cathode plate loading and unloading shell 8;

[0029] The tempering structure comprises a tempering box 7, in which a shelf 9 is arranged, on which the cathode plate loading and unloading shell is placed, and an opening 10 is provided in the shell facing the placement groove.

[0030] During implementation, the cathode plate fixing structure includes a corrugated structure 11 arranged at one end and the middle of the straight plate, the corrugated structure is conformed to the cathode plate flow channel, and the cathode plate and the straight plate are connected and clamped by a polytetrafluoroethylene ring 12.

[0031] In implementation, the corrugated structure includes at least three rectangular structures conforming to the shape of the cathode plate flow channel.

[0032] During implementation, the fixed cover plate is fixedly connected to the housing via screws.

[0033] During implementation, rollers 13 are installed at both ends of the fixed cover plate.

[0034] During implementation, guide grooves 14 are provided on both sides of the shell, and protrusions 15 are provided on both sides of the movable cover plate to slide in the guide grooves.

[0035] During implementation, three drawer-type shelves are arranged in the tempering box.

[0036] During implementation, a handle 16 is fixed to one side of the housing.

[0037] First, the curved cathode plate is bonded to the straight plate with a corrugated structure. Three or more rectangular structures matching the cathode plate flow channel are designed at one end and the middle of the straight plate. In order to facilitate the coordinated installation of the cathode plate and the rectangular structure, the height and width of the rectangular structure are slightly smaller than the corresponding dimensions of the cathode plate flow channel, but the pitch of the two is equal. The bonded assembly is tightened and positioned with a retractable polytetrafluoroethylene ring at the two ends of the straight plate with corrugated structures and the other end of the straight plate, and the assembly is named a cathode clamping plate.

[0038] Second, a placement slot for the cathode clamping plate is designed on the shell, and the cathode clamping plate can be moved from one end of the placement slot to the other end. Considering the errors in the cathode plate design and processing process, a certain gap is left when designing the placement slot. The width and height of the internal slot of the placement slot are slightly higher than the overall structure of the cathode clamping plate, and the two have the same pitch. The purpose of this is to improve the accuracy of pushing the cathode clamping plate in, ensure the accurate movement of the cathode plate, and also to better repair the bending problem of the cathode plate. Guide grooves are designed on both sides of the placement slot to facilitate the rapid movement and positioning of the movable cover plate. Two openings are designed at the bottom of the placement slot to make preliminary preparations for subsequent heat treatment and tempering. When the cathode clamping plate is installed in the placement slot, a fixed cover plate is installed at one end by screws along the direction of the guide groove, and an adjustable gasket can be added between the cover plate and the shell to adjust the height. Rollers are designed at both ends of the fixed cover plate to facilitate the easy movement and accurate positioning of the cathode clamping plate. There is a movable cover plate at the other end, and the lower part of the movable cover plate is designed with a protrusion corresponding to the guide groove of the placement slot, which is convenient for the movable cover plate to slide and fix in the specified direction. The fixed cover plate, the movable cover plate and the shell are integrally named the cathode plate loading and unloading shell.

[0039] The cathode plate repaired by mechanical means cannot guarantee to completely solve the bending problem of the trimmed cathode plate. Therefore, it is considered to subject the cathode corrugated plate to tempering heat treatment. The purpose of tempering is to use the metal heat treatment process to improve its mechanical properties and eliminate the internal stress generated during the processing. In order to achieve the above purpose, a tempering box is designed. The interior of the tempering box is designed with three drawer-type shelves, which are interconnected to facilitate uniform heating and more efficiently complete the tempering heat treatment of multiple cathode plates. In addition, the tempering box is also provided with components such as a door 17, a heating body and a temperature controller. The temperature controller is used to adjust the temperature and heating time of the heat treatment. After the heat treatment is completed, open the tempering box valve, pull out the handle, and take out the cathode plate loading and unloading shell.

[0040] The specific operation includes the following steps:

[0041] 1. Position and fix the bent and deformed cathode plate. The three rectangular cross-section flow channels at the front end of the bent and deformed cathode plate are buckled together with the three rectangular structures on the straight plate. While ensuring the flatness of the cathode plate, the middle flow channel of the cathode plate is also buckled together with the three rectangular structures in the middle of the straight plate, completing the positioning and fixation of the rectangular cross-section flow channel of the cathode plate. Use polytetrafluoroethylene rings to clamp and fix the corresponding positions on the top, middle and bottom of the cathode clamping plate to complete the positioning and fixation of the entire cathode plate. The polytetrafluoroethylene ring is elastic and can clamp the cathode plate and the straight plate.

[0042] 2. Through holes are provided at the four corners of the fixed cover plate, so that the fixed cover plate can be easily installed on the shell. The fixed cover plate after cutting and drilling is placed on the shell, and the roller is installed on the fixed cover plate. The fixed cover plate is positioned and installed with gaskets and screws. Finally, the fixed cover plate and the outlet position of the shell are fixed with a baffle to complete the installation of the cathode plate trimming structure.

[0043] 3. Slowly push the fastened cathode clamping plate along the placement groove in the middle of the shell. When it reaches the fixed cover position, the installed roller will work to smoothly send the cathode clamping plate into the fixed cover trimming area and then to the designated position.

[0044] 4. The movable cover is correctly placed in the designated position, and the two protrusions at the bottom of the movable cover are moved to the designated position, completing the pressing and fixing of the cathode plate as a whole, and then the heat treatment process is carried out. The overall structure is called the cathode plate loading and unloading shell.

[0045] 5. The designed tempering box uses a connecting hinge 18 to firmly install the valve, and four supporting angle brackets are installed at the bottom of the tempering box. At the same time, a control system 19 is used on the top of the tempering box to control the heat treatment process. Slowly send the three cathode plate loading and unloading shells into the tempering cabinet, close the tempering box door, adjust the tempering time and temperature, and wait for a while.

[0046] 6. After the heat treatment is completed, wait for the temperature of the tempering box to cool down, open the door of the tempering box, take out the cathode plate loading and unloading shell as a whole, and completely take out the trimmed cathode plate structure.

[0047] Finally, it should be noted that those skilled in the art may make various modifications and variations to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is intended to include these modifications and variations.

Claims

1. A mechanical trimming structure for trimming a cathode plate of a fuel cell, characterized in that: It includes a straight plate, a shell, a fixed cover plate, a movable cover plate and a tempering structure; The straight plate is provided with a cathode plate fixing structure, and the cathode plate is fixedly mounted on the straight plate through the cathode plate fixing structure to form a cathode clamping plate; The shell is provided with a placement groove for allowing the cathode clamping plate to slide, the fixed cover plate is fixedly installed at one end of the shell, the movable cover plate is slidably matched with the shell and one end is abutted against the fixed cover plate, the fixed cover plate and the movable cover plate are located above the cathode plate, and the shell, the cathode clamping plate, the fixed cover plate and the movable cover plate constitute a cathode plate loading and unloading shell; The tempering structure comprises a tempering box body, a shelf is arranged in the tempering box body, the cathode plate loading and unloading shell is placed on the shelf shelf, and the shell body is provided with an opening facing the placement groove.

2. A mechanical trimming structure for trimming a cathode plate of a fuel cell according to claim 1, characterized in that: The cathode plate fixing structure comprises a corrugated structure arranged at one end and the middle of the straight plate, the corrugated structure is conformed to the cathode plate flow channel, and the cathode plate and the straight plate are connected and clamped by a polytetrafluoroethylene ring.

3. A mechanical trimming structure for trimming a cathode plate of a fuel cell according to claim 2, characterized in that: The corrugated structure includes at least three rectangular structures conforming to the shape of the cathode plate flow channel.

4. The mechanical trimming structure for trimming a cathode plate of a fuel cell according to claim 1, characterized in that: The fixed cover plate is fixedly connected to the housing via screws.

5. The mechanical trimming structure for trimming a cathode plate of a fuel cell according to claim 1, characterized in that: Rollers are installed at both ends of the fixed cover plate.

6. The mechanical trimming structure for trimming a cathode plate of a fuel cell according to claim 1, characterized in that: Guide grooves are provided on both sides of the shell, and protrusions which are slidably matched with the guide grooves are protruded from both sides of the movable cover.

7. The mechanical trimming structure for trimming a cathode plate of a fuel cell according to claim 1, characterized in that: Three drawer-type shelves are arranged in the tempering box.

8. The mechanical trimming structure for trimming a cathode plate of a fuel cell according to claim 1, characterized in that: A handle is fixed on one side of the shell.

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