Voltage-resistant bipolar plate

Abstract

The invention belongs to the technical field of pressure-resistant bipolar plates, and particularly relates to a pressure-resistant bipolar plate which comprises a bipolar plate body, a plurality of flow channels are formed in the top of the bipolar plate body, and a flanging assembly is arranged around the edge of the bipolar plate body by a circle to increase the overall structural strength of the bipolar plate body. The multiple groups of flow channels are arranged in a snake shape from left to right along the top of the bipolar plate body, periodic first convex edges are arranged in the flow channels, the ratio of the height of the first convex edges to the depth of the flow channels is (1: 3)-(1: 5), the overall strength of the bipolar plate body is improved through the first convex edges arranged in the flow channels, and due to the arrangement of stress grooves, the overall strength of the bipolar plate body is improved. Stress can be guided to be diffused to a surrounding low-stress area, local stress is prevented from being too high, the overall pressure resistance of the bipolar plate body is further improved, meanwhile, the overall structural strength of the bipolar plate body is improved through a reinforcing flange structure formed by matching the reinforcing flange with the second protruding edge, and the overall structural strength of the bipolar plate body is improved through matching with the first protruding edge to form a dual-strength structure. And the structural strength of the bipolar plate body is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of pressure-resistant bipolar plates, and specifically to a pressure-resistant bipolar plate. Background Art

[0002] A high-temperature fuel cell is a power generation device that directly converts the chemical energy of fuel and oxidant into electrical energy based on an oxidation-reduction reaction. The oxidation-reduction reaction includes a water electrolysis process based on a proton exchange membrane and a fuel cell reaction. The active substances in the battery are continuously fed into the positive and negative electrodes from the outside, and the reaction products are discharged from the battery, and it can be used continuously. And because the energy conversion is not limited by the Carnot cycle and the only by-product is water, and the water is discharged from the battery in the form of water vapor in a high-temperature environment, the high-temperature fuel cell has the characteristics of high energy conversion efficiency and environmental friendliness; The membrane electrode and the bipolar plate are the core components of a proton exchange membrane fuel cell, which are used to catalyze the oxidation-reduction reaction of fuel. The main functions of the bipolar plate pair are to provide hydrogen, oxygen and coolant fluid channels, separate hydrogen and oxygen, collect electrons, and conduct heat; At present, the bipolar plates of the technologies used require light weight and good structural strength at the same time, which is a certain contradiction. If the plate thickness is a little thicker, the structural strength will be better, but the weight will increase. To reduce the weight, it is necessary to reduce the plate thickness as much as possible. The commonly used plate thickness is between 0.06 and 0.12 mm. With such a thin plate, the structural strength of a large-area bipolar plate is relatively poor. Therefore, there is an urgent need to provide a pressure-resistant bipolar plate to improve the structural strength while ensuring the thickness is satisfied. Summary of the Invention

[0003] The purpose of this part is to outline some aspects of the embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this part as well as in the abstract and title of the present application to avoid obscuring the purpose of this part, the abstract and the title of the invention, and such simplifications or omissions shall not be used to limit the scope of the present invention.

[0004] Therefore, the purpose of the present invention is to provide a pressure-resistant bipolar plate. By setting a first convex rib between the flow channels, the stress distribution is made uniform, thereby increasing the overall compressive strength of the bipolar plate body. And the setting of the stress groove can guide the stress to spread to the surrounding low-stress areas to avoid excessive local stress, thereby improving the overall pressure resistance of the bipolar plate body. At the same time, the reinforcing flanging structure formed by the cooperation of the reinforcing flanging and the second convex rib is strengthened to increase the overall structural strength of the bipolar plate body. In cooperation with the first convex rib, a double-strength structure is formed to ensure the structural strength of the bipolar plate body.

[0005] To solve the above technical problems, according to one aspect of the present invention, the following technical solutions are provided: A pressure-resistant bipolar plate, which includes: As a bipolar plate body connecting the substrate, multiple sets of flow channels are provided at the top of the bipolar plate body; A flanging component is connected to the bipolar plate body and is arranged in a circle along the edge of the bipolar plate body to increase the overall structural strength of the bipolar plate body.

[0006] As a preferred solution of a pressure-resistant bipolar plate according to the present invention, among them: multiple sets of the flow channels are arranged in a serpentine shape from left to right at the top of the bipolar plate body, and a periodic first convex rib is provided in the flow channel, and the height ratio of the first convex rib to the depth of the flow channel is 1:3 - 1:5.

[0007] As a preferred solution of a pressure-resistant bipolar plate according to the present invention, among them: in order to make the stress distribution uniform, multiple sets of the first convex ribs are arranged in a wavy shape.

[0008] As a preferred solution of a pressure-resistant bipolar plate according to the present invention, among them: multiple stress grooves are provided at the bottom of the bipolar plate body, and multiple sets of the stress grooves are arranged in a cross shape.

[0009] As a preferred solution of a pressure-resistant bipolar plate according to the present invention, among them: the flanging component includes a strengthening flanging arranged in a circle along the edge of the bipolar plate body, and a second convex rib is provided between the bottom of the strengthening flanging and the bipolar plate body.

[0010] As a preferred solution of a pressure-resistant bipolar plate according to the present invention, among them: the cross section of the strengthening flanging is Z-shaped or U-shaped.

[0011] As a preferred solution of a pressure-resistant bipolar plate according to the present invention, among them: the cross section of the second convex rib and the second convex rib is an isosceles triangle or an equilateral triangle.

[0012] As a preferred solution of a pressure-resistant bipolar plate according to the present invention, among them: the bipolar plate body is formed by ultra-thin stamping + hydroforming, and a protective coating is coated on the outside of the bipolar plate body, and the protective coating is a multi-layer structure, and the multi-layer structure includes a Ti transition layer + a CrN main layer + a DLC surface layer from top to bottom in sequence.

[0013] As a preferred solution of a pressure-resistant bipolar plate according to the present invention, among them: an edge sealing structure is adopted between the bipolar plate body and the strengthening flanging, and the multi-stage sealing design is as follows: The first stage, laser welding the edge of the bipolar plate body to form a continuous airtight barrier; The second stage, elastic sealant is filled in the microscopic compression gap to compensate for the surface unevenness, and the compression rate is controlled at 20% - 30%.

[0014] Compared with the prior art, the beneficial effects of the present invention are: By arranging the first convex ridge between the flow channels, the stress distribution is made uniform, thereby increasing the overall compressive strength of the bipolar plate body. Moreover, the setting of the stress groove can guide the stress to spread to the surrounding low-stress areas, avoiding excessive local stress, and further enhancing the overall pressure resistance of the bipolar plate body. At the same time, the reinforcing flanging structure formed by the cooperation of the flanging and the second convex ridge is strengthened, increasing the overall structural strength of the bipolar plate body. Cooperating with the first convex ridge, a double-strength structure is formed to ensure the structural strength of the bipolar plate body. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the present invention will be described in detail below in conjunction with the drawings and detailed embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative labor. Among them: Figure 1 is a schematic diagram of the overall structure of the present invention; Figure 2 is a schematic diagram of a partial structure of the present invention; Figure 3 is a schematic diagram of the side view structure of the present invention; Figure 4 is a schematic diagram of the top view structure of the present invention; Figure 5 is a schematic diagram of the protective coating structure of the present invention.

[0016] In the figure: 100 bipolar plate body, 110 flow channel, 111 first convex ridge, 120 stress groove, 130 protective coating, 200 flanging assembly, 210 reinforcing flanging, 220 second convex ridge. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] In order to make the above objects, features, and advantages of the present invention more obvious and understandable, the following detailed description of the specific embodiments of the present invention will be made in conjunction with the drawings.

[0018] In the following description, many specific details are set forth in order to fully understand the present invention. However, the present invention can also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0019] Secondly, the present invention will be described in detail with reference to the schematic diagrams. When describing the embodiments of the present invention in detail, for the convenience of explanation, the cross-sectional views showing the device structure will be enlarged locally out of the general proportion, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention herein. In addition, in actual production, three-dimensional spatial dimensions including length, width, and depth should be included.

[0020] To make the objectives, technical solutions and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0021] The present invention provides a pressure-resistant bipolar plate. The overall strength of the bipolar plate body is increased by the first convex ribs provided in the flow channels, and the stress grooves are provided to guide the stress to spread to the surrounding low-stress areas, avoiding excessive local stress, thereby improving the overall pressure resistance of the bipolar plate body. At the same time, the reinforcing flanging structure formed by the cooperation of the reinforcing flanging and the second convex ribs increases the overall structural strength of the bipolar plate body. In cooperation with the first convex ribs, a double-strength structure is formed to ensure the structural strength of the bipolar plate body. Please refer to Figures 1-4 , including the bipolar plate body 100 and the flanging assembly 200; Please continue to refer to Figures 1-5 , the bipolar plate body 100 as the connection matrix, and a plurality of flow channels 110 are provided at the top of the bipolar plate body 100; The plurality of flow channels 110 are arranged in a serpentine pattern from left to right along the top of the bipolar plate body 110, and periodic first convex ribs 111 are provided in the flow channels 110. The ratio of the height of the first convex ribs 111 to the depth of the flow channels 110 is 1:3 - 1:5; A plurality of stress grooves 120 are provided at the bottom of the bipolar plate body 100, and the plurality of stress grooves 120 are arranged in a cross pattern. By providing the first convex ribs 111 between the flow channels 110, the stress distribution is made uniform, thereby increasing the overall compressive strength of the bipolar plate body 100. Moreover, the stress grooves 120 are provided to guide the stress to spread to the surrounding low-stress areas, avoiding excessive local stress, and thus improving the overall pressure resistance of the bipolar plate body 100; Furthermore, the bipolar plate body 100 is a metal plate formed by ultra-precision stamping + hydroforming, and a protective coating 130 is coated on the outside of the bipolar plate body 100. The protective coating 130 is a multi-layer structure, and the multi-layer structure includes a Ti transition layer + a CrN main layer + a DLC surface layer from top to bottom in sequence. By coating the protective coating 130 (forming a double protective layer by physical barrier + chemical passivation) on the surface of the bipolar plate body 100, the surface corrosion resistance of the plate body is ensured, and it is possible to avoid the occurrence of hydrogen corrosion (cathode) or passivation film dissolution (anode) of the bipolar plate in an acidic environment (pH 2 - 3), resulting in ion contamination and performance degradation; Please continue to refer to Figures 2-3 , the flanging assembly 200 is connected to the bipolar plate body 100 and is arranged to surround the edge of the bipolar plate body 100 to increase the overall structural strength of the bipolar plate body 100; The flanging component 200 includes a reinforcing flanging 210 disposed around the edge of the bipolar plate body 100. A second convex rib 220 is provided between the bottom of the reinforcing flanging 210 and the bipolar plate body 100. The cross-section of the reinforcing flanging 210 is Z-shaped or U-shaped. The reinforcing flanging structure formed by the cooperation of the reinforcing flanging 210 and the second convex rib 220 increases the overall structural strength of the bipolar plate body 100. Cooperating with the first convex rib 111, a double-strength structure is formed to ensure the structural strength of the bipolar plate body 100. Pressure measurement standard: Static pressure test: Gradually pressurize to 2.5 MPa (1.5 times the working pressure), keep the pressure for 30 minutes, and the leakage rate < 0.1 sccm; Cyclic pressure test: 0.5 - 2.0 MPa alternating load ( times), penetrant inspection, no fatigue cracks are found; Pressure resistance range: Improved from the conventional 1.0 - 1.5 MPa to 2.0 - 3.0 MPa; Lifetime extension: After the cyclic pressure test, there is no obvious plastic deformation, and penetrant inspection shows no fatigue cracks; Working principle: When the present invention is in use, by arranging the first convex rib 111 between the flow channels 110, the stress distribution is made uniform, thereby increasing the overall compressive strength of the bipolar plate body 100. Moreover, the setting of the stress groove 120 can guide the stress to spread to the surrounding low-stress areas, avoiding excessive local stress, and thus enhancing the overall pressure resistance of the bipolar plate body 100. At the same time, the reinforcing flanging structure formed by the cooperation of the reinforcing flanging 210 and the second convex rib 220 increases the overall structural strength of the bipolar plate body 100. Cooperating with the first convex rib 111, a double-strength structure is formed to ensure the structural strength of the bipolar plate body 100.

[0022] Although the present invention has been described above with reference to the embodiments, various improvements can be made to it and its components can be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the various features in the disclosed embodiments of the present invention can be combined with each other in any way. The exhaustive description of these combinations is not given in this specification only for the sake of saving space and resources. Therefore, the present invention is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A pressure-resistant bipolar plate, characterized in that, Comprising: A bipolar plate body (100) as a connection substrate, on the top of the bipolar plate body (100), multiple groups of flow channels (110) are provided; A flanging component (200), connected to the bipolar plate body (100), arranged in a circle along the edge of the bipolar plate body (100) to increase the overall structural strength of the bipolar plate body (100).

2. The pressure-resistant bipolar plate according to claim 1, characterized in that, Multiple groups of the flow channels (110) are arranged in a serpentine pattern from left to right on the top of the bipolar plate body (110), and periodic first convex ribs (111) are provided in the flow channels (110), and the ratio of the height of the first convex ribs (111) to the depth of the flow channels (110) is 1:3 - 1:

5.

3. The pressure-resistant bipolar plate according to claim 2, wherein To make the stress distribution uniform, multiple groups of the first convex ribs (111) are arranged in a wavy shape.

4. The pressure-resistant bipolar plate according to claim 3, characterized in that, On the bottom of the bipolar plate body (100), multiple groups of stress grooves (120) are provided, and multiple groups of the stress grooves (120) are arranged in a cross pattern.

5. The pressure-resistant bipolar plate according to claim 4, wherein, The flanging component (200) includes a reinforcing flange (210) arranged in a circle along the edge of the bipolar plate body (100), and a second convex rib (220) is provided between the bottom of the reinforcing flange (210) and the bipolar plate body (100).

6. The pressure-resistant bipolar plate according to claim 5, characterized in that, The cross-section of the reinforcing flange (210) is Z-shaped or U-shaped.

7. The pressure-resistant bipolar plate according to claim 6, wherein The cross-section of the second convex rib (220) and the second convex rib (220) is an isosceles triangle or an equilateral triangle.

8. A pressure-resistant bipolar plate according to claim 1, characterized in that, The bipolar plate body (100) is made of a metal plate by ultra-precision stamping + hydroforming, and a protective coating (130) is coated on the outside of the bipolar plate body (100), and the protective coating (130) is a multi-layer structure, and the multi-layer structure includes a Ti transition layer + a CrN main layer + a DLC surface layer from top to bottom in sequence.

9. A pressure-resistant bipolar plate according to claim 1, characterized in that, An edge sealing structure is adopted between the bipolar plate body (100) and the reinforcing flange (210), and the multi-stage sealing design is as follows: The first stage, laser welding the edge of the bipolar plate body to form a continuous airtight barrier; The second stage, an elastic sealant is filled in the microscopic compression gap to compensate for the surface unevenness, and the compression rate is controlled at 20% - 30%.

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