Bridging type metal bipolar plate

Abstract

The invention discloses a bridging type metal bipolar plate. The bridging type metal bipolar plate comprises an oxygen plate and a hydrogen plate. The oxygen plate and the hydrogen plate are laminated; a circle of sealing ring groove, used for placement of a sealing ring, is formed at the periphery of each inlet and outlet; each sealing rings seals a gas distribution passageway surface of each air inlet and each air outlet, which is connected with a gas flow field; a groove is also formed at the position of each sealing ring groove, which is overlapped with each gas distribution passageway; a support gasket which matches with the groove is placed in each groove; the upper surface of each support gasket is flushed with the bottom of each sealing ring groove and is supported at the bottom of each sealing ring; and the lower surface of each support gasket is higher than each gas distribution passageway and serves as a cavity top of the gas distribution passageway. In the bridging type metal bipolar plate, each support gasket and the bottom of each sealing ring groove form a support surface of each sealing ring, so that the sealing rings without support at the bottoms are prevented from being deformed excessively to affect the gas tightness thereof; and a gas enters the gas flow fields from gas inlets of a stereoscopic empty cavity which is formed by bottoms of the support gaskets to be distributed uniformly or enters the gas outlets from the flow fields, so that smooth flow and distribution of the gas is not affected.

Description

technical field [0001] The invention belongs to the field of fuel cells, in particular to the field of a metal bipolar plate structure for a fuel cell. Background technique [0002] As a high-efficiency and environment-friendly power generation device, fuel cells have broad application prospects in base station power supplies, small and medium-sized power stations, electric vehicles, backup power supplies, and portable power supplies. Fuel cells can be divided into proton exchange membrane fuel cells, direct methanol fuel cells, alkaline fuel cells, solid oxide fuel cells, molten salt fuel cells, microbial fuel cells, biofuel cells, etc. Fuel cells are mainly composed of end plates, collector plates, bipolar plates, membrane electrodes, etc. [0003] The bipolar plate is the support part of the fuel cell. It mainly plays the role of supporting, distributing the diversion gas, isolating the gas and collecting and conducting electricity. At present, there are two main types o...

AI Technical Summary

Problems solved by technology

The main purpose of this patent is to solve the sealant support problem of the water flow channel, and the same support gasket is placed at the bottom of the sealing ring at the gas inlet and outlet positions, and the gap position of the sealing ring also has the problem of uneven acceptance, and because the support pad The position of the sheet cannot be fixed, and it will also affect the assembly of the bipolar plate, further affecting the distribution of the gas

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