Device and method for preparing composite bipolar plate for fuel cell

Abstract

The invention relates to a device and a method for preparing a composite bipolar plate for a fuel cell. The device comprises a powder mixing machine (3), a pre-pressing mold (5), an oven (7), a mold (9), a pressure vessel (11) and a cutting mold (13). Powder materials are mixed in the powder mixing machine (3) and then are input into the pre-pressing mold (5) to be pre-pressed into a light panel (6); and then the panel is placed into the oven (7) to be dried and then is placed into the mold to be molded into a board with a flow path; and after being shaped by the pressure vessel (11), the board is cut by the cutting mold (13) into a bipolar plate (14) with the flow path. Compared with the prior art, the process of the invention is simple and easy to implement. The obtained product has excellent electrical conductivity, bending strength and the like and is corrosion resistant, and prices of raw materials are low.

Description

technical field [0001] The invention relates to a device and method for preparing battery bipolar plates, in particular to a device and method for preparing composite bipolar plates for fuel cells. Background technique [0002] As a key component of the PEMFC cell stack, the bipolar plate accounts for about 70% to 80% of the total mass of the entire PEMFC, and its cost accounts for about 40% to 60% of the total cost. Heavy weight and high manufacturing cost are the main bottlenecks for the commercialization of PEMFCs. Therefore, it is necessary to select a suitable bipolar plate material and a reasonable bipolar plate preparation process to reduce the overall quality and cost of PEMFC. [0003] At present, there are three types of bipolar plates commonly used in PEMFC: metal plates, pure graphite and composite plates. Metal bipolar plates not only have high strength and good toughness, but also have good electrical and thermal conductivity, high density, and are easy to ma...

AI Technical Summary

Problems solved by technology

However, it is difficult to meet the requirements of high conductivity and high mechanical strength of bipolar plate materials at the same time, and the immaturity of mass production technology limits its wide commercial application. Therefore, it is necessary to develop a low-cost, high-performance and easy-to-use Mass production of graphite / resin composite bipolar plates

[0004] WO0041260 mentions the use of flexible graphite plates to prepare bipolar plates. The bipolar plates are formed by pressing first and then filled with glue. The adhesive is mainly polyvinylidene fluoride. The detailed preparation process is not mentioned. The focus is on the structure of the bipolar plate on the resistance The bipolar plate adopts a two-layer structure, that is, the hydrogen flow field plate and the water cavity are used as a plate, and the oxygen flow field plate is used as a plate. The two are bonded together to form a bipolar plate. The disadvantage is that the pressing process is complicated, and the hydrogen Due to the flow field on both sides, the board is difficult to form and easy to break, which leads to a high scrap rate

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