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Bipolar plate assembly, manufacturing process, cell stack and fuel cell vehicle

A bipolar plate and component technology, applied in fuel cells, fuel cell parts, power system fuel cells, etc., can solve problems such as high production costs, easy displacement of sealing rings, and low output

Active Publication Date: 2021-12-03
DONGFENG MOTOR GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the sealing step, the custom-made sealing ring is usually pasted on the bipolar plate, or the glue dispensing process is used. After a long time of use, the sealing ring is easy to shift, resulting in sealing failure
[0005] In summary, the bipolar plate manufacturing process in the prior art has the technical problems of high production cost, long preparation cycle, and low output, and the prepared bipolar plate has poor durability and sealing performance

Method used

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  • Bipolar plate assembly, manufacturing process, cell stack and fuel cell vehicle
  • Bipolar plate assembly, manufacturing process, cell stack and fuel cell vehicle
  • Bipolar plate assembly, manufacturing process, cell stack and fuel cell vehicle

Examples

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Embodiment 1

[0044] The embodiment of the present invention provides a bipolar plate assembly 200, which is different from the bipolar plate in the prior art that only includes a cathode plate and an anode plate that are not connected, see Figure 1 to Figure 4 The bipolar plate assembly 200 provided in this embodiment includes a cathode plate 220, an anode plate 230 and a sealing assembly. The cathode plate 220 and the anode plate 230 are bonded with the opening of the flow channel 110 facing each other and connected as a whole through the sealing assembly. The sealing of the bipolar plates mainly includes the sealing of the water field c between the cathode plate 220 and the anode plate 230, and the sealing between the cathode and anode plates and the membrane electrodes, so as to prevent hydrogen and air blow-by from causing safety hazards. The sealing assembly not only plays the role of sealing the hydrogen field a, air field b and water field c, but also plays the role of "welding wire...

Embodiment 2

[0064] Based on the same inventive concept, this embodiment provides a manufacturing process for manufacturing the bipolar plate assembly 200 of the first embodiment above.

[0065] see Figure 1 to Figure 5 , the manufacturing process includes the following steps:

[0066] Stamping process: stamping and forming flow channel 110, sealing groove 120 and accommodating cavity 260 on the base material, opening injection molding process hole 130 in the groove wall of sealing groove 120, and obtaining cathode plate 220 and anode plate 230.

[0067] Specifically, in this embodiment, the base material is a pre-coated metal plate, and the stamping of the sealing groove 120 and the housing cavity 260 and the punching of the injection molding hole 130 are simultaneously completed during the stamping process of the runner 110 . Then enter the sealing process.

[0068] Sealing process: attach the cathode plate 220 and the anode plate 230 with the opening of the flow channel 110 facing ea...

Embodiment 3

[0072] Based on the same inventive concept, this embodiment provides an electric stack. A typical electric stack structure sequentially includes an intake end plate, an intake end insulation plate, an intake end collector plate, a repeating unit, a blind end collector plate, a blind end End insulation plate, blind end end plate. The whole stack is fixed by the stack fasteners, and the end plates at both ends provide a certain pressure to the repeating unit, so that the sealing ring is deformed under pressure to achieve a good sealing effect.

[0073] see Figure 6 , in the electric stack provided in this embodiment, at least one bipolar plate assembly 200 of the above-mentioned embodiment 1 is arranged in the repeating unit, so the electric stack provided in this embodiment has all the advantages of the above-mentioned embodiment 1. For other unspecified structures of the electric stack in this embodiment, reference may be made to relevant publications in the prior art, and n...

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Abstract

The invention discloses a bipolar plate assembly, a manufacturing process, a cell stack and a fuel cell vehicle, and aims to solve the technical problems of high production cost, long preparation period and low yield of an existing bipolar plate manufacturing process, and the technical problems of poor durability and sealing performance of a prepared bipolar plate. The bipolar plate assembly comprises a cathode plate, an anode plate and a sealing assembly, wherein the cathode plate and the anode plate are attached in a posture that flow channel openings are opposite and are fixed into a whole through the sealing assembly; the sealing assembly comprises an outer frame insulation sealing ring wrapping a containing cavity and an inner frame insulation sealing ring wrapping a sealing groove, and the protruding height of the outer frame insulation sealing ring and the protruding height of the inner frame insulation sealing ring are both larger than the protruding height of flow channels. The cathode plate and the anode plate are connected into a whole through the integrally-formed sealing assembly, and the sealing assembly serves as a welding wire, so that the welding step in an existing bipolar plate manufacturing process can be omitted; and a plate sealing ring and a gas field side sealing ring are integrally formed, so that the sealing performance is good.

Description

technical field [0001] The application belongs to the technical field of fuel cells, and in particular relates to a bipolar plate assembly and a manufacturing process, an electric stack and a fuel cell vehicle. Background technique [0002] A proton exchange membrane fuel cell (PEMFC) is a power generation device that uses hydrogen as fuel to directly convert chemical energy into electrical energy. The bipolar plate is an important core component of the fuel cell, which plays the role of gas distribution, water heat management, current collection, and support for the stack. The bipolar plate includes a cathode plate and an anode plate. The two sides of the cathode plate are respectively the water field and the air field. field, the two sides of the anode plate are water field and hydrogen field respectively. Hundreds of bipolar plates and membrane electrodes are stacked, and the fastening force is applied through the end plates on both sides to form a fuel cell stack. [0...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/0273H01M8/0276H01M8/0284H01M8/0286H01M8/2465B60L50/70
CPCH01M8/0273H01M8/0276H01M8/0284H01M8/0286H01M8/2465B60L50/70H01M2250/20Y02E60/50Y02P70/50Y02T90/40
Inventor 王慧周俊欧兵兵覃博文王手龙
Owner DONGFENG MOTOR GRP
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