Electric pile packaging structure of fuel cell

Abstract

The fuel cell stack packaging structure comprises a stack assembly, an elastic adjusting assembly and a plurality of bandages, the stack assembly comprises a reactor core, a positive end plate, a negative end plate, a positive collector plate and a negative collector plate, the positive collector plate and the negative collector plate are respectively arranged on two opposite surfaces of the reactor core, and the elastic adjusting assembly is arranged on the elastic adjusting assembly. The positive electrode end plate and the negative electrode end plate are arranged on the sides, away from the reactor core, of the positive electrode collector plate and the negative electrode collector plate respectively, the elastic adjusting assembly is arranged on the side, away from the reactor core, of the positive electrode end plate, the multiple binding bands are distributed at intervals in the first direction, each binding band is bound to the surfaces of the negative electrode end plate and the elastic adjusting assembly, and the two ends of each binding band are connected with each other; and the electric pile assembly and the elastic adjusting assembly are bound into a whole. According to the technical scheme of the embodiment, adjustment is performed through the elastic adjusting assembly, so that the same pressure applied to the reactor core by each bandage is ensured, the problem of non-uniform stress distribution in the reactor core is effectively solved, and the condition of breakage caused by overlarge local stress is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of fuel cells, in particular to a fuel cell stack packaging structure. Background Art

[0002] A hydrogen fuel cell is a power generation device that directly converts the chemical energy of hydrogen and oxygen into electrical energy. Its basic principle is the reverse reaction of water electrolysis, where hydrogen and oxygen are supplied to the anode and cathode respectively. After hydrogen diffuses outward through the anode and reacts with the electrolyte, it releases electrons and reaches the cathode through an external load. Because it does not pollute the environment and does not release dust pollution caused by combustion through electrochemical reactions, it is widely used in aerospace, automotive, and power generation fields.

[0003] Since the output voltage and power of a single hydrogen fuel cell are low, multiple single fuel cells need to be stacked to form a fuel cell stack to provide the required power for conventional electrical appliances. Currently, among the packaging and fastening forms of fuel cell stacks, the commonly used packaging methods are as follows: the first is the tie rod fastening packaging form, but this packaging form will cause the problem of uneven stress distribution inside the stack; the second is the strap fastening packaging form, but due to the particularity of its structure, it requires specific press tooling equipment (adding welding parts), and a certain pre-tightening force is required to tighten the strap during welding. This part of the pre-tightening force also requires a certain process to ensure that the stress of the strap on the end plate will not be offset; in addition, once the structure is packaged, it is difficult to debug the packaging force. Utility Model Content

[0004] In order to solve the above technical problems, the utility model provides a fuel cell stack packaging structure.

[0005] The present application provides a fuel cell stack packaging structure, including:

[0006] A stack assembly, comprising a core, a positive terminal plate, a negative terminal plate, a positive current collecting plate and a negative current collecting plate, wherein the positive current collecting plate and the negative current collecting plate are respectively arranged on two opposite surfaces of the core, and the positive terminal plate and the negative terminal plate are respectively arranged on the side of the positive current collecting plate and the negative current collecting plate away from the core;

[0007] An elastic adjustment assembly, which is arranged on a side of the positive terminal plate away from the core;

[0008] A plurality of binding straps are spaced apart along a first direction, each of the binding straps is bound on the surface of the negative terminal plate and the elastic adjustment component, and the two ends of the binding straps are connected to each other to bind the battery stack component and the elastic adjustment component into one;

[0009] The elastic adjustment component is used to adjust the tension of the straps to ensure that the pressure exerted by each strap on the core is the same.

[0010] In one embodiment, the elastic adjustment assembly includes a cover plate and a disc spring, the cover plate is located on the side of the positive end plate facing away from the core, the disc spring is adjustably arranged between the cover plate and the positive end plate, and the two ends of the disc spring are respectively abutted against the surfaces of the cover plate and the positive end plate, and part of the strap is abutted against the surface of the cover plate facing away from the core.

[0011] In one embodiment, the elastic adjustment assembly includes an adjustment block and an adjustment rod. A mounting groove is provided on the surface of the cover plate facing the core. The adjustment block is adjustably installed in the mounting groove. One end of the adjustment rod passes through the cover plate and is connected to the bottom surface of the adjustment block. One end of the disc spring is connected to the adjustment block.

[0012] In one embodiment, a mounting hole is provided on the surface of the binding strap abutting against the cover plate, and the mounting hole is used for the adjusting rod to pass through.

[0013] In one embodiment, a limiting groove is provided on the surface of the negative end plate facing away from the core, a first groove connected to the limiting groove is provided on both sides of the negative end plate, and a second groove opposite to the first groove is provided on both sides of the positive end plate, and part of the strap is respectively bound in the limiting groove, the first groove and the second groove.

[0014] In one embodiment, the widths of the limiting groove, the first groove and the second groove are the same;

[0015] Wherein, the width of the limiting groove is greater than the width of the binding belt.

[0016] In one embodiment, the binding strap is formed by connecting a belt body connected end to end, and a portion of the belt body facing the core is provided with an insulating layer, and the length of the insulating layer is greater than the length of the core.

[0017] In one embodiment, the distance between the insulating layer and the core is between 0 and 5 mm.

[0018] Compared with the prior art, the above technical solution provided by the embodiment of the present application has the following beneficial effects:

[0019] A positive current collecting plate and a negative current collecting plate are arranged on two opposite surfaces of the core, and then the positive terminal plate and the negative terminal plate are used to press the positive current collecting plate and the negative current collecting plate respectively, and an elastic adjustment component is arranged on one side of the positive terminal plate, and then the battery stack assembly and the elastic adjustment component are tied together with a plurality of straps. When it is necessary to adjust the pressure applied by the strap to the core, it can be adjusted through the elastic adjustment component to ensure that the pressure applied by each strap to the core is the same, which effectively solves the problem of uneven stress distribution inside the core and avoids local rupture due to excessive stress. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of an embodiment of a fuel cell stack packaging structure of the present application;

[0021] Figure 2 It is an exploded schematic diagram of a fuel cell stack packaging structure of the present application;

[0022] Figure 3 It is a schematic diagram of an elastic adjustment component in a fuel cell stack packaging structure of the present application;

[0023] Figure 4 It is a schematic diagram of a binding strap in a fuel cell stack packaging structure of the present application.

[0024] Numbers in the figure:

[0025] 10. Battery stack assembly; 11. Core; 12. Negative terminal plate; 12a. Limiting groove; 12b. First slot; 13. Positive terminal plate; 13a. Second slot; 14. Negative current collecting plate; 15. Positive current collecting plate; 20. Elastic adjustment assembly; 21. Cover plate; 21a. Mounting groove; 22. Disc spring; 23. Adjustment block; 24. Adjustment rod; 30. Binding strap; 31. Belt body; 40. Insulating layer; 50. Mounting hole. DETAILED DESCRIPTION

[0026] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation methods of the present invention are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the directions or positional relationships indicated by "front", "back", "up", "down", "left", "right", "longitudinal", "horizontal", "vertical", "horizontal", "top", "bottom", "inside", "outside", "head", "tail", etc. are based on the directions or positional relationships shown in the accompanying drawings, are constructed and operated in a specific direction, and are only for the convenience of describing the present technical solution, rather than indicating that the device or element referred to must have a specific direction, and therefore cannot be understood as a limitation to the present invention.

[0027] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0028] Please refer to Figures 1 to 4 An embodiment of the present application provides a fuel cell stack packaging structure, including a fuel cell stack assembly 10, an elastic adjustment assembly 20, and a plurality of straps 30.

[0029] Specifically, the stack assembly 10 includes a core 11, a positive terminal plate 13, a negative terminal plate 12, a positive current collecting plate 15 and a negative current collecting plate 14, wherein the positive current collecting plate 15 and the negative current collecting plate 14 are respectively arranged on two opposite surfaces of the core 11, and the positive terminal plate 13 and the negative terminal plate 12 are respectively arranged on the side of the positive current collecting plate 15 and the negative current collecting plate 14 away from the core 11. The elastic adjustment component 20 is arranged on the side of the positive terminal plate 13 away from the core 11. A plurality of straps 30 are distributed at intervals along a first direction, each strap 30 is tied to the surface of the negative terminal plate 12 and the elastic adjustment component 20, and the two ends of the strap 30 are connected to each other to tie the stack assembly 10 and the elastic adjustment component 20 into one. Among them, the elastic adjustment component 20 is used to adjust the tension of the strap 30 to ensure that the pressure exerted by each strap 30 on the core 11 is the same.

[0030] It should be noted that the “first direction” mentioned above refers to the length direction of the core 11. Figure 1 In addition, the "plurality" mentioned above refers to two or more than two, which depends on the actual situation and is not limited to this.

[0031] Exemplarily, the elastic adjustment assembly 20 is used to adjust the tension of the strap 30 to ensure that the pressure exerted by each strap 30 on the core 11 remains the same. To this end, the elastic adjustment assembly 20 may adopt the specific structure of the following embodiment, or may adopt a component in the prior art that can adjust the tension of the strap 30, which is not limited thereto.

[0032] In addition, it should be noted that the “same pressure” mentioned above can be considered the same within a certain error range, for example, within an error range of 0 to 1N, it can be considered the same, then the pressure applied to the core 11 by one strap 30 is 30N, and the pressure applied to the core 11 by another strap 30 is 30.6N, and the difference between them is 0.6N, which is within the above error range, and therefore it can be considered that the same pressure is applied to the core 11. The above is only an example and is not limited to this.

[0033] In the fuel cell stack packaging structure based on the above technical features, a positive current collecting plate 15 and a negative current collecting plate 14 are arranged on two opposite surfaces of the core 11, and then the positive terminal plate 13 and the negative terminal plate 12 are used to press the positive current collecting plate 15 and the negative current collecting plate 14 respectively, and an elastic adjustment component 20 is arranged on one side of the positive terminal plate 13, and then the stack assembly 10 and the elastic adjustment component 20 are tied together by multiple straps 30. When it is necessary to adjust the pressure applied by the strap 30 to the core 11, it can be adjusted through the elastic adjustment component 20 to ensure that the pressure applied by each strap 30 to the core 11 is the same, thereby effectively solving the problem of uneven stress distribution inside the core 11 and avoiding local rupture due to excessive stress.

[0034] In one embodiment, the elastic adjustment assembly 20 includes a cover plate 21 and a disc spring 22. The cover plate 21 is located on the side of the positive terminal plate 13 facing away from the core 11. The disc spring 22 is adjustably arranged between the cover plate 21 and the positive terminal plate 13, and the two ends of the disc spring 22 are respectively abutted against the surfaces of the cover plate 21 and the positive terminal plate 13, and part of the band body of the strap 30 is abutted against the surface of the cover plate 21 facing away from the core 11.

[0035] Exemplarily, a cover plate 21 is provided on the side of the positive terminal plate 13 facing away from the core 11, and a disc spring 22 is provided between the cover plate 21 and the positive terminal plate 13, and then the cover plate 21 is connected to the positive terminal plate 13, the core 11, the negative terminal plate, the positive current collector 15 and the negative current collector by using a strap 30. The tension between the straps 30 is adjusted by adjusting the compression amount of the disc spring 22, which can ensure that the pressure applied by each strap 30 to the core 11 is the same, thereby effectively solving the problem of uneven stress distribution inside the core 11.

[0036] In one embodiment, the elastic adjustment assembly 20 includes an adjustment block 23 and an adjustment rod 24. A mounting groove 21a is provided on the surface of the cover plate 21 facing the core 11. The adjustment block 23 is adjustably installed in the mounting groove 21a. One end of the adjustment rod 24 passes through the cover plate 21 and is connected to the bottom surface of the adjustment block 23. One end of the disc spring 22 is connected to the adjustment block 23.

[0037] Exemplarily, a mounting groove 21a is provided on the surface of the cover plate 21 facing the core 11, and the mounting groove 21a is adjustably installed in the mounting groove 21a, and then the disc spring 22 is connected to the adjustment block 23 at one end facing the cover plate 21, so that when the tension of the strap 30 is adjusted, it is only necessary to push the adjustment rod 24 to make the adjustment block 23 move in the mounting groove 21a in a direction perpendicular to the core 11, thereby driving the disc spring 22 to move in a direction perpendicular to the core 11, ensuring that the disc spring 22 does not move.

[0038] In one embodiment, a mounting hole 50 is provided on the surface of the strap 30 abutting against the cover plate 21, and the mounting hole 50 is used for the adjustment rod 24 to pass through. In this way, the adjustment rod 24 is passed through the mounting hole 50 on the strap 30, so that the strap 30 is fixed on the surface of the cover plate 21, and will not move randomly. When the tension of the strap 30 needs to be adjusted, it is only necessary to push the adjustment rod 24 to push the adjustment block 23 closer to or away from the positive terminal plate 13, thereby changing the compression amount of the disc spring 22, and adjusting the tension of the strap 30. The structure is simple and the adjustment is convenient.

[0039] In one embodiment, a limiting groove 12a is provided on the surface of the negative end plate 12 facing away from the core 11, a first groove 12b connected to the limiting groove 12a is provided on both sides of the negative end plate 12, and a second groove 13a opposite to the first groove 12b is provided on both sides of the positive end plate 13, and parts of the strap 30 are respectively bound in the limiting groove 12a, the first groove 12b and the second groove 13a.

[0040] In one embodiment, the widths of the limiting groove 12a, the first groove 12b, and the second groove 13a are the same, wherein the width of the limiting groove 12a is greater than the width of the binding band 30. In this way, it can be ensured that the binding band 30 will not move after being inserted into the limiting groove 12a, the first groove 12b, and the second groove 13a, thereby ensuring uniform force on the core 11.

[0041] In one embodiment, the binding strap 30 is formed by connecting a belt body 31 connected end to end, and an insulating layer 40 is provided at a portion of the belt body 31 facing the core, and the length of the insulating layer 40 is greater than the length of the core 11 .

[0042] For example, the two ends of the belt body 31 are connected to form a circular shape, which can effectively prevent the core 11 from moving when used in a vibration condition. It should be noted that the belt body 31 can be made of metal material, but an insulating layer 40 needs to be provided at the portion of the belt body 31 facing the core to cover the core 11, which can effectively prevent the core 11 from contacting the binding band 30 to cause a path, thereby causing electrical safety problems.

[0043] In other embodiments, the strip 31 can be made of an integral insulating material, and there is no need to set an insulating layer 40 on the portion of the strip 31 facing the core 11. However, it is necessary to ensure that the insulating material used to make the strap 30 has good strength to meet the requirements of binding the negative terminal plate 12, the negative current collecting plate 14, the core 11, the positive current collecting plate 15, the positive terminal plate 13 and the elastic adjustment component 20 into one.

[0044] In addition, it should be noted that the length of the insulating layer 40 needs to be greater than the length of the core 11. The reason why the length of the insulating layer 40 is set to be greater than the length of the core 11 is to ensure that the insulating layer 40 can completely cover the core 11, and avoid the strap 30 from contacting the core 11 and causing problems such as short circuits.

[0045] In one embodiment, the distance between the insulating layer 40 and the core 11 is between 0 and 5 mm. Exemplarily, the distance between the insulating layer 40 and the core 11 is set within the above range to prevent the distance between the insulating layer 40 and the core 11 from being too large and external impurities from entering, thereby affecting the normal operation of the fuel cell stack.

[0046] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principle of the present invention. These improvements and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. A fuel cell stack packaging structure, characterized in that: include: A stack assembly, comprising a core, a positive terminal plate, a negative terminal plate, a positive current collecting plate and a negative current collecting plate, wherein the positive current collecting plate and the negative current collecting plate are respectively arranged on two opposite surfaces of the core, and the positive terminal plate and the negative terminal plate are respectively arranged on the side of the positive current collecting plate and the negative current collecting plate away from the core; An elastic adjustment assembly, which is arranged on a side of the positive terminal plate away from the core; A plurality of binding straps are spaced apart along a first direction, each of the binding straps is bound on the surface of the negative terminal plate and the elastic adjustment component, and the two ends of the binding straps are connected to each other to bind the battery stack component and the elastic adjustment component into one; The elastic adjustment component is used to adjust the tension of the straps to ensure that the pressure exerted by each strap on the core is the same.

2. The fuel cell stack packaging structure according to claim 1, characterized in that: The elastic adjustment assembly includes a cover plate and a disc spring, the cover plate is located on the side of the positive end plate facing away from the core, the disc spring is adjustably arranged between the cover plate and the positive end plate, and the two ends of the disc spring are respectively in contact with the surfaces of the cover plate and the positive end plate, and part of the band body of the binding strap is in contact with the surface of the cover plate facing away from the core.

3. The fuel cell stack packaging structure according to claim 2, characterized in that: The elastic adjustment assembly includes an adjustment block and an adjustment rod. A mounting groove is provided on the surface of the cover plate facing the core. The adjustment block is adjustably mounted in the mounting groove. One end of the adjustment rod passes through the cover plate and is connected to the bottom surface of the adjustment block. One end of the disc spring is connected to the adjustment block.

4. The fuel cell stack packaging structure according to claim 3, characterized in that: A mounting hole is provided on the surface where the binding belt abuts against the cover plate, and the mounting hole is used for the adjusting rod to pass through.

5. The fuel cell stack packaging structure according to claim 1, characterized in that: A limiting groove is provided on the surface of the negative end plate facing away from the core, a first groove connected to the limiting groove is provided on both sides of the negative end plate, a second groove opposite to the first groove is provided on both sides of the positive end plate, and part of the strap is respectively bound in the limiting groove, the first groove and the second groove.

6. The fuel cell stack packaging structure according to claim 5, characterized in that: The widths of the limiting groove, the first groove and the second groove are the same; Wherein, the width of the limiting groove is greater than the width of the binding belt.

7. The fuel cell stack packaging structure according to claim 1, characterized in that: The binding belt is formed by connecting belt bodies which are connected end to end. The portion of the belt body which faces the core is provided with an insulating layer, and the length of the insulating layer is greater than the length of the core.

8. The fuel cell stack packaging structure according to claim 7, characterized in that: The distance between the insulating layer and the core is between 0 and 5 mm.

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