Bipolar plate and fuel cell

Abstract

The invention provides a bipolar plate and a fuel cell. The bipolar plate comprises a cathode plate (1) and an anode plate (2), the cathode plate (1) comprises an air inlet (3), an air outlet (4) andan air flow channel (5), the first end of the air flow channel (5) is communicated with the air inlet (3), the second end of the air flow channel (5) is communicated with the air outlet (4), and the air outlet (4) completely covers the air flow channel (5). According to the bipolar plate, timely discharge of liquid water on the cathode side can be ensured, and the working stability of the bipolarplate under high current density is greatly improved.

Description

technical field [0001] The present application relates to the technical field of fuel cells, in particular to a bipolar plate and a fuel cell. Background technique [0002] As an important part of the fuel cell, the bipolar plate has the functions of collecting current, supporting the membrane electrode and evenly distributing the reaction gas. The metal bipolar plate is generally processed by welding two metal plates (the graphite bipolar plate has two graphite plates bonded together, the following mainly uses the metal bipolar plate as an example to illustrate), the two metal plates The space formed by the plate is generally used as a flow space for the cooling liquid, and is used for circulating the cooling liquid, and a plurality of flow channels are arranged on the surface of the metal plate for circulating the reaction gas. Considering that the cathode side of the fuel cell is the main place to generate water during the reaction, the drainage performance of the cathod...

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Problems solved by technology

[0003] For the bipolar plates of the prior art, since the hydrogen inlet / outlet, the air inlet / outlet and the cooling water inlet / outlet are arranged side by side, due to the occupation of the hydrogen inlet / outlet and the cooling water inlet / outlet, the air inlet / outlet The width is narrow, much smaller than the width of the air channel in the middle area. In order to ensure uniform air distribution, it is necessary to add a shunt structure on the air inlet side. At the same time, on the air outlet side, the width is narrowed from the middle area to the air outlet position , there will be shrinkage of the air flow channel, and this shrinkage is generally manifested as a decrease in the number of flow channels, which will lead to the narrowing of the air flow channel, and the water produced during the reaction will exist on the outlet side of the air flow channel Large flow resistance, under high current density, it is easy to have insufficient drainage capacity of the air flow channel, and the problem that liquid water cannot be discharged from the flow channel in time, greatly reducing the working stability of the plate under high current density

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