Production method for graphite bipolar plate of fuel cell

Abstract

The invention provides a production method for a graphite bipolar plate of a fuel cell, which comprises the following steps of: A) taking a high-purity graphite block which is baked for one time or is soaked for one time and baked for two times as a raw material, and mechanically cutting the graphite block into bipolar plate biscuits; B) flatly grinding the bipolar plate biscuits into bipolar plate sheets; C) using a horizontal milling cutter which is formed by a plurality of parallel circular saw blades to process a straight-through flow field structure with multiple grooves which are distributed in parallel to form semi-finished bipolar plate products; and D) sealing the semi-finished bipolar plate products by using epoxy glue and conducting solidification to obtain finished bipolar plate products. Compared with the prior art, the cost of the bipolar plate of the fuel cell is greatly reduced from the aspects of the selection of the raw material, the flow field design of the graphite bipolar plate, the processing and the like, and the production method is particularly suitable for the production of the bipolar plate with deep runners.

Description

technical field [0001] The invention relates to a fuel cell, in particular to a method for manufacturing a fuel cell graphite bipolar plate. Background technique [0002] The bipolar plate is one of the key components of the fuel cell. It plays an important role in conducting electricity, isolating hydrogen and oxygen / air, and uniformly transporting reaction gases in the battery. Fuel cell bipolar plates currently mainly use graphite bipolar plates, metal bipolar plates, composite bipolar plates and molded graphite bipolar plates. The weight of graphite bipolar plates widely used at present is about 60% to 70% of the total weight of the stack, and the total cost reaches 60%. [0003] Regarding the composite bipolar plate, patent CN1294669C discloses a manufacturing method, which uses mesocarbon particles as raw materials and carbon fiber as a reinforcing material, and is molded into a proton exchange membrane fuel cell bipolar plate through a gel injection molding process a...

AI Technical Summary

Problems solved by technology

[0008] Machining of traditional graphite plates is still the most commonly used solution in fuel cell bipolar plates at present. Graphite material itself is porous, breathable and brittle, which makes proton exchange membrane fuel stacks using graphite bipolar plates very expensive and relatively reliable. lower

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