High-temperature fuel cell graphite bipolar plate stamping molding mold and method

A high-temperature fuel cell and stamping forming technology, applied in the field of high-temperature fuel cells, can solve the problems of affecting the performance and life of the fuel cell stack, destroying the surface structure of the graphite plate, rough and burr on the surface of the finished product, etc., so as to speed up the commercialization process and solve the problem of surface Corrosion and hydrogen permeation, smooth surface effect

Active Publication Date: 2019-06-28
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, CNC is usually used to engrave the flow channel on the surface of the graphite bipolar plate in the form of machining. This method not only has a long processing cycle, but also cannot realize mass production. The surface of the finished product is rough and has burrs, which damages the surface of the graphite plate. Therefore, surface corrosion and hydrogen permeation are prone to occur during use, which will affect the performance and life of the fuel cell stack

Method used

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  • High-temperature fuel cell graphite bipolar plate stamping molding mold and method
  • High-temperature fuel cell graphite bipolar plate stamping molding mold and method
  • High-temperature fuel cell graphite bipolar plate stamping molding mold and method

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Effect test

Embodiment 1

[0042] The installation of embodiment 1 mold

[0043] Fasten the thermal resistance upper plate 2 and the upper cover plate 1 of the mold to the upper end plate of the hydraulic press through four positioning hole bolts, and the upper mold 19 and the four corners of the heating and cooling plate 3 are used to fasten the heating and cooling upper plate. The plate 3 is fixed on the upper cover plate 1, so that the heating and cooling plate 3, the thermal resistance upper plate 2, and the upper cover plate 1 are fastened together by bolts and fixed with the upper end plate of the hydraulic press. The cooling water inlet 13 and the cooling water outlet 14 are respectively connected with stainless steel water pipes for the entry and exit of mold cooling circulating water.

[0044]The upper surface of the thermal resistance upper plate 2 is provided with a thermal resistance threading hole 20 and a thermal resistance threading groove 21, and two thermal resistances 18 pass through t...

Embodiment 2

[0049] Embodiment 2 molding process

[0050] In the working state, first separate the upper mold 19 from the demoulding middle cavity 4 with a demoulding angle, fill the proportioned graphite and resin mixture into the demoulding middle cavity 4 and ensure that the material is sufficient and uniform. The upper end plate of the hydraulic press is fixed (that is, in the working state, the plate 3 on the heating and cooling plate, the plate 2 on the thermal resistance plate, and the upper cover plate 1 are all fixed), and the lower end plate of the hydraulic press is lifted upward at a uniform speed, driving the lower plate of the heating and cooling plate 5. The lower plate 6 and the lower cover plate 7 of the thermal resistance plate are raised upwards, so that the cavity of the mold demoulding is closed and the mixture of graphite and resin is extruded to complete the mold clamping process.

[0051] After the mold is closed, the temperature is rapidly raised to 300-340° C. by ...

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Abstract

The invention provides a high-temperature fuel cell graphite bipolar plate stamping molding mold. The high-temperature fuel cell graphite bipolar plate stamping molding mold is composed of upper and lower two models and a demolding middle cavity with a demolding angle, wherein the upper and lower two models are provided with convex portions correspondingly, a bipolar plate pressed out of a flow channel is separated to obtain a molded bipolar plate, the upper and lower two models are each fixedly connected with one heating cooling plate, and the upper and lower two heating cooling plates of thegraphite bipolar plate stamping molding mold are each fixedly connected with one thermal electric resistance plate to be used for monitoring the temperature of the whole mold. The high-temperature fuel cell graphite bipolar plate stamping molding mold provided by the invention is reasonable in structure and high in stamping efficiency, a series of working procedures of material filling, heating,stamping, cooling, demolding, part fetching and the like can be performed rapidly, the demolding is simple and convenient and high in success rate, the production cost is low, the graphite bipolar plate prepared by the stamping is smooth in surface, uniform in thickness and good in flow channel size consistency, the gas flow channel can be molded at one time without need of mechanical machining, the precision is high, the surface corrosion and hydrogen penetration phenomena can be effectively solved after later-period heat treatment, and the commercialization process of high-temperature fuel cells can be effectively accelerated.

Description

technical field [0001] The invention belongs to the technical field of high-temperature fuel cells, and in particular relates to a stamping mold and method for graphite bipolar plates used in high-temperature fuel cells. Background technique [0002] High-temperature fuel cell graphite bipolar plate is an important part of the fuel cell stack. The graphite bipolar plate supports the MEA in the fuel cell stack and provides materials such as hydrogen and air required for proton exchange membrane power generation. At the same time, due to the high-temperature fuel cell The generation of electric energy inside the stack is an exothermic chemical reaction process. When the battery stack is working, it needs to circulate the cooling fluid to take away the heat generated by the reaction, so as to maintain the stability and consistency of the overall temperature of the battery stack, and the graphite bipolar plate can provide cooling. The flow channels required for the liquid to cir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C43/36B29C43/50B29C43/52
Inventor 杨林林张浩孙公权
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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