Proton exchange membrane fuel cell metal bipolar plate

Abstract

The invention discloses a proton exchange membrane fuel cell metal bipolar plate. The metal bipolar plate comprises an anode unipolar plate and a cathode unipolar plate, wherein the anode unipolar plate and the cathode unipolar plate are correspondingly arranged. Two unipolar plates are provided with a fuel gas cavity, an oxidant gas cavity, a distribution area, a cooling medium cavity and an active zone respectively. Each active zone is composed of a flow field region and concavo and convex structures on both ends thereof, and a number of alternately arranged bumps and pits are uniformly distributed in two concave and convex structures. A discontinuous gas medium cavity flow channel and a hollow cooling medium cavity flow channel are formed between two concave and convex structures. Two ends of each gas medium cavity flow channel are communicated with a reaction gas cavity respectively. Two ends of each cooling medium cavity flow channel are communicated with the cooling medium cavityrespectively. According to the invention, the proton exchange membrane fuel cell metal bipolar plate solves the common problem of overall deformation caused by the fact that internal stress cannot beeffectively released during the existing metal bipolar plate stamping preparation. Compared with a bipolar plate in the existing structure, the metal bipolar plate provided by the invention has the advantages that gas and cooling liquid can be better distributed; and the problem that the groove depth is slightly shallow at the boundary of a flow field is effectively improved.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a metal bipolar plate of a proton exchange membrane fuel cell. Background technique [0002] Proton exchange membrane fuel cell (PEMFC) is a power generation device that uses hydrogen as fuel, oxygen or air as oxidant, and converts chemical energy stored in fuel and oxidant directly into electrical energy. In PEMFC, the bipolar plate has the functions of separating the reaction medium, collecting current and conducting electricity, supporting the membrane electrode, conducting heat, and providing channels for the reaction gas by processing gas channels on the bipolar plate or combining with the flow field plate, uniformly distributing the reaction gas and draining water. And so on. In addition, the temperature of the battery can also be controlled with a coolant through the gap formed in the coupled two bipolar plates. [0003] Compared with graphite bipolar plates, metal bi...

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Problems solved by technology

[0008] The present invention proposes a proton exchange membrane fuel cell metal bipolar plate in order to solve the defects of deformation, internal stress release and excessive cooling liquid flow resistance caused by uneven flow distribution in the prior art fuel cell preparation.

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