Sheet metal sandwich flexible graphite bipolar plate

Abstract

The utility model relates to the field of flexible graphite bipolar plates, in particular to a metal sheet sandwich flexible graphite bipolar plate, which is characterized in that a metal sheet is fixed between an upper flexible graphite polar plate and a lower flexible graphite polar plate through adhesive glue, and a plurality of positioning pieces are fixedly arranged on the upper side and the lower side of the metal sheet; an outer frame and a pressing piece are fixedly arranged at the bottom of the upper flexible graphite polar plate, the pressing piece is located on the inner side of the outer frame, and an inner frame is fixedly arranged at the top of the lower flexible graphite polar plate. According to the utility model, through the mutual clamping between the positioning piece and the positioning cavity, the metal sheet can be positioned during assembly, and through the cooperative arrangement of the outer frame, the pressing piece, the inner frame and the pressing groove, the smearing and bonding area of the bonding glue can be increased during assembly; therefore, the stability of the upper flexible graphite polar plate, the metal sheet and the lower flexible graphite polar plate after assembly can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of flexible graphite bipolar plates, in particular to a metal thin plate sandwich flexible graphite bipolar plate. Background Art

[0002] Graphite is a porous, lightweight, and soft material made by high-temperature expansion and pressing of natural graphite or artificial graphite. Flexible graphite bipolar plate is an important component used in fuel cells. It is mainly made of flexible graphite material and has excellent conductivity, chemical stability, and mechanical flexibility.

[0003] At present, the production of ultra-large and efficient fuel cell graphite plates usually adopts the method of increasing thickness to solve the strength and flatness problems of graphite plates. By adhering metal sheets between the original flexible graphite bipolar plates, high-toughness graphite bipolar plates can be prepared, which greatly improves the strength and toughness of the bipolar plates.

[0004] However, a series of problems will arise during the process of metal sheets adhering to the flexible graphite bipolar plates. For example, the metal sheets are not well positioned during the adhesion process, and the adhesion stability is not particularly good, which will cause the metal sheets to loosen or fall off during the use of the flexible graphite bipolar plates, which is not conducive to user use. Utility Model Content

[0005] The utility model aims to solve the shortcomings in the prior art and proposes a metal sheet sandwich flexible graphite bipolar plate.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A metal sheet sandwich flexible graphite bipolar plate comprises an upper flexible graphite plate, a metal sheet and a lower flexible graphite plate, wherein the metal sheet is fixed between the upper flexible graphite plate and the lower flexible graphite plate by adhesive, and a plurality of positioning pieces are fixedly provided on the upper and lower sides of the metal sheet; an outer frame and a pressing piece are fixedly provided at the bottom of the upper flexible graphite plate, the pressing piece is located on the inner side of the outer frame, and an inner frame is fixedly provided at the top of the lower flexible graphite plate.

[0008] In addition, a preferred structure is that a plurality of positioning cavities are provided on the side of the upper flexible graphite plate and the lower flexible graphite plate facing the metal sheet, and the positioning cavities are adapted to the positioning pieces.

[0009] In addition, a preferred structure is that a pressing groove is opened downwardly on the top of the inner frame, and a plurality of through holes are opened through the side walls of the inner frame, and the through holes are connected to the pressing groove.

[0010] In addition, a preferred structure is that the inner frame has the same height as the outer frame, and when the upper flexible graphite plate is pressed onto the lower flexible graphite plate, the inner frame fits inside the outer frame.

[0011] In addition, a preferred structure is that the pressing piece is located on the inner side of the outer frame and does not contact the inner wall of the outer frame, and the pressing piece is matched with the pressing groove on the inner frame.

[0012] In addition, a preferred structure is that the metal sheet is adapted to be assembled on the inner side of the inner frame, and the metal sheet has the same height as that of the inner frame.

[0013] The beneficial effects of the utility model are as follows: the metal sheet can be positioned during assembly by the mutual clamping between the positioning piece and the positioning cavity, and the application and bonding area of ​​the adhesive can be increased during assembly by the matching arrangement between the outer frame, the pressing piece, the inner frame and the pressing groove, thereby improving the stability of the upper flexible graphite plate, the metal sheet and the lower flexible graphite plate after assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the structure of a metal sheet sandwich flexible graphite bipolar plate proposed by the utility model;

[0015] Figure 2 This is a schematic diagram of the explosion structure of a metal sheet sandwich flexible graphite bipolar plate proposed by the utility model;

[0016] Figure 3 This is a schematic diagram of the structure of an upper flexible graphite plate of a metal sheet sandwich flexible graphite bipolar plate proposed by the utility model when viewed from above;

[0017] Figure 4 This is a schematic diagram of the structure of a metal sheet of a metal sheet sandwiched flexible graphite bipolar plate proposed by the utility model;

[0018] Figure 5 The utility model provides a schematic structural diagram of a lower flexible graphite plate of a metal sheet sandwich flexible graphite bipolar plate.

[0019] In the figure: 1 upper flexible graphite plate, 11 outer frame, 12 pressing piece, 2 metal sheet, 21 positioning piece, 22 positioning cavity, 3 lower flexible graphite plate, 31 inner frame, 311 pressing groove, 312 through hole. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0021] Reference Figure 1-5, a metal sheet sandwich flexible graphite bipolar plate, comprising an upper flexible graphite plate 1, a metal sheet 2 and a lower flexible graphite plate 3, the metal sheet 2 is fixed between the upper flexible graphite plate 1 and the lower flexible graphite plate 3 by adhesive, and a plurality of positioning members 21 are fixedly arranged on the upper and lower sides of the metal sheet 2. An outer frame 11 and a pressing member 12 are fixedly arranged at the bottom of the upper flexible graphite plate 1, the pressing member 12 is located on the inner side of the outer frame 11, and an inner frame 31 is fixedly arranged at the top of the lower flexible graphite plate 3. By setting the adhesive, the metal sheet 2 can be assembled between the upper flexible graphite plate 1 and the lower flexible graphite plate 3. And it is worth noting that the specific structure and working mode of the upper flexible graphite plate 1 and the lower flexible graphite plate 3 are all existing technologies currently disclosed on the market, which are all common knowledge known to those skilled in the art, and do not belong to the main technical problems to be solved in this technical solution, so they are not elaborated in this utility model.

[0022] Furthermore, the outer frame 11 , the pressing piece 12 and the upper flexible graphite plate 1 are an integrated structure and made of the same material, and the inner frame 31 and the lower flexible graphite plate 3 are an integrated structure and made of the same material.

[0023] Among them, a plurality of positioning cavities 22 are provided on the upper flexible graphite plate 1 and the lower flexible graphite plate 3 on the side facing the metal sheet 2, and the positioning cavities 22 are adapted to the positioning members 21. Through the mutual clamping between the positioning cavities 22 and the positioning members 21, not only can the metal sheet 2 be positioned when it is installed, but also the subsequent assembly effect of the metal sheet 2 can be improved.

[0024] A pressing groove 311 is provided downwardly at the top of the inner frame 31, and a plurality of through holes 312 are provided through the side walls of the inner frame 31, and the through holes 312 are all connected to the pressing groove 311. Through the provision of the through holes 312, the adhesive in the pressing groove 311 can flow to the outside during pressing, so as to improve the bonding effect.

[0025] The inner frame 31 has the same height as the outer frame 11, and when the upper flexible graphite plate 1 is pressed on the lower flexible graphite plate 3, the inner frame 31 is adapted to be located on the inner side of the outer frame 11. The pressing piece 12 is located on the inner side of the outer frame 11 and does not contact the inner wall of the outer frame 11, and the pressing piece 12 is adapted to the pressing groove 311 on the inner frame 31.

[0026] The metal sheet 2 is adapted to be assembled inside the inner frame 31, and the metal sheet 2 has the same height as the inner frame 31. The inner frame 31 can be used to position the metal sheet 2, thereby ensuring that the metal sheet 2 will not be displaced during installation.

[0027] In this embodiment, when the user needs to install the metal sheet 2, the user only needs to evenly apply the adhesive to the contacting parts between the upper flexible graphite plate 1, the metal sheet 2 and the lower flexible graphite plate 3. Then the user can assemble the metal sheet 2 inside the inner frame 31 on the lower flexible graphite plate 3, and then cover the upper flexible graphite plate 1 on the lower flexible graphite plate 3. Finally, when the adhesive is dry, the assembly of the metal sheet 2 is completed.

[0028] Furthermore, when the upper flexible graphite plate 1 is covered on the lower flexible graphite plate 3, the outer frame 11 is adapted to be located outside the inner frame 31, and the pressing piece 12 is adapted to be inserted into the pressing groove 311. At this time, the adhesive in the pressing groove 311 can be squeezed out from the through hole 312 by the pressure of the pressing piece 12, and the adhesive can be squeezed through the through hole 312 to the outer wall of the metal sheet 2 and the inner wall of the outer frame 11, thereby further improving the stability of the upper flexible graphite plate 1, the metal sheet 2 and the lower flexible graphite plate 3 after assembly. And through the adaption between the positioning piece 21 and the positioning cavity 22, the metal sheet 2 can be positioned during assembly.

[0029] In the utility model, the metal sheet 2 can be positioned during assembly by the mutual clamping between the positioning piece 21 and the positioning cavity 22, and the outer frame 11, the pressing piece 12, the inner frame 31 and the pressing groove 311 are matched to increase the application bonding area of ​​the adhesive during assembly, thereby improving the stability of the upper flexible graphite plate 1, the metal sheet 2 and the lower flexible graphite plate 3 after assembly.

[0030] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A metal sheet sandwich flexible graphite bipolar plate, comprising an upper flexible graphite plate (1), a metal sheet (2) and a lower flexible graphite plate (3), characterized in that: The metal sheet (2) is fixed between the upper flexible graphite plate (1) and the lower flexible graphite plate (3) by means of adhesive, and a plurality of positioning members (21) are fixedly provided on both the upper and lower sides of the metal sheet (2); An outer frame (11) and a pressing piece (12) are fixedly provided at the bottom of the upper flexible graphite plate (1), the pressing piece (12) is located on the inner side of the outer frame (11), and an inner frame (31) is fixedly provided at the top of the lower flexible graphite plate (3).

2. The metal sheet sandwich flexible graphite bipolar plate according to claim 1, characterized in that: A plurality of positioning cavities (22) are provided on the upper flexible graphite plate (1) and the lower flexible graphite plate (3) on the side facing the metal sheet (2), and the positioning cavities (22) are adapted to the positioning pieces (21).

3. The metal sheet sandwich flexible graphite bipolar plate according to claim 1, characterized in that: A pressing groove (311) is provided downwardly on the top of the inner frame (31), and a plurality of through holes (312) are provided through the side walls of the inner frame (31), and the through holes (312) are all connected to the pressing groove (311).

4. The metal sheet sandwich flexible graphite bipolar plate according to claim 3, characterized in that: The inner frame (31) has the same height as the outer frame (11), and when the upper flexible graphite plate (1) is pressed onto the lower flexible graphite plate (3), the inner frame (31) is adapted to be located inside the outer frame (11).

5. The metal sheet sandwich flexible graphite bipolar plate according to claim 4, characterized in that: The pressing piece (12) is located on the inner side of the outer frame (11) and does not contact the inner wall of the outer frame (11), and the pressing piece (12) is adapted to the pressing groove (311) on the inner frame (31).

6. The metal sheet sandwich flexible graphite bipolar plate according to claim 5, characterized in that: The metal sheet (2) is adapted to be assembled on the inner side of the inner frame (31), and the metal sheet (2) and the inner frame (31) have the same height.

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