Novel bipolar plate distribution head of proton exchange membrane fuel cell

Abstract

The invention discloses a novel bipolar plate distribution head of a proton exchange membrane fuel cell, which comprises an active area and a flow guide area, wherein one end of the flow guide area isconnected with a gas inlet and outlet; the flow guide area comprises a plurality of flow guide islands which are discontinuously distributed in rows and lines, and the flow guide islands are of a rounded rectangular convex structure and are integrally distributed in a fan shape; the same row of flow guide islands incline at the same angle, the inclined included angles between adjacent flow guideislands in the same row of flow guide islands are the same, the included angle between the adjacent flow guide islands of the anode is 3-10 degrees, and the included angle between the adjacent flow guide islands of the cathode is 2-8 degrees. The novel bipolar plate distribution head provided by the invention of the proton exchange membrane fuel cell has a good reaction gas distributing effect, and can effectively release internal stress generated by a metal bipolar plate in the preparation and stamping process, so that the bipolar plate is ensured to have good flatness, and the service life of a stack is greatly prolonged; and the novel bipolar plate distribution head is not only suitable for metal bipolar plates, but also suitable for graphite bipolar plates and composite bipolar plates.

Description

technical field [0001] The invention relates to the technical field of proton exchange membrane fuel cells, in particular to a novel proton exchange membrane fuel cell bipolar plate distribution head. 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, providing channels for the reaction gas, evenly distributing the reaction gas and draining water. It is called the "skeleton" of the fuel cell stack, bipolar The main function of the distribution area in the plate is to distribute the reaction gas, so that the reaction gas can be evenly distributed when it enters the active area, so as to avoid the uneven press...

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Problems solved by technology

[0004] In the prior art, Patent No. CN102034986B discloses a distribution head structure of a bipolar plate. The advantage of the distribution head is that the distance between the diversion islands increases gradually along the upward direction, which has a better gas distribution effect; The advantage is that the direction of the diversion island is consistent, which is only suitable for graphite bipolar plates. If it is applied to metal bipolar plates, the stamping preparation will produce a consistent direction and large internal stress, so that the bipolar plate will move along the direction of the diversion island. Warping occurs on both radial sides of the

[0005] Patent CN204991855U discloses a distribution head of a bipolar plate. The guide bar of the distribution head is distributed in a Z shape, which can play a certain role in gas distribution. However, the raised area of ​​the guide bar in this shape is small and the direction is single. It is difficult to ensure the strength and flatness of the bipolar plate if it is applied to a metal bipolar plate

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