Electrode plate for fuel cell and fuel cell thereof

Abstract

The invention relates to an electrode plate for a fuel cell and the fuel cell thereof. The electrode plate comprises a substrate with at least one main acting plane, wherein at least one flow channel is arranged on the substrate, and a plurality of diversion projections staggeredly extend out of the two side walls of at least one flow channel at intervals; and a gap is formed between each diversion projection and the other side wall. Further, each diversion projection has a front curved surface, a back curved surface and a top surface, the front curved surface is arranged towards the converse direction of reaction flow, and the back curved surface is arranged towards the same direction of the reaction flow. Further, the front curved surface is of a concave surface, and the back curved surface is of a convex surface. Through the diversion projections, when the reaction flow passes through the diversion projections, the pressure of the reaction flow can be effectively increased, thereby not only improving the effect that the reaction flow penetrates the breathable layer of a membrane electrode assembly and effectively improving the distribution of the reaction flow, but also preventing the large block aggregation phenomenon generated by the reaction, and improving the reliability of the fuel cell.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, in particular to a polar plate of a fuel cell and a fuel cell thereof. Background technique [0002] Fuel cells are considered to be a new type of power source and energy converter with multiple uses. There are quite a few different types of fuel cells, one of which is called a proton exchange membrane fuel cell (PEMFC). PEMFC is mainly designed as a stack of bipolar plates and a membrane electrode assembly (MEA) sandwiched between the bipolar plates. There are various types of flow fields on the bipolar plates to deliver the reaction flow to the reaction interface on the MEA and discharge it in the PEMFC. excess heat and water generated by electrochemical reactions in the Years of practice have shown that there are many deficiencies in the design of bipolar plates, such as the distribution efficiency of the reacting flow, heat and water management, and so on. Despite years of effort, these...

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Problems solved by technology

This design does not allow the reaction flow to enter the mold electrode assembly well, and more of it just flows in the flow channel

[0005] The inventor of the present invention applied for patent No. 12 / 319697 in the U.S., titled "a bipolar plate for fuel cells is composed of multi-fluid channels, which can shrink, expand, reflect and split the reaction flow, thereby improving Distribution, Diffusion and Water Management of Reacting Flow” US patent application, in this scheme, the bipolar plate is designed to have a structure with a plurality of diversion bumps, and the formed flow channel can make the reaction flow shrink, expand, Reflection and shunting, so as to improve the distribution of reaction flow, diffusion and water management, but this design is suitable for the situation where the reaction flow pressure is high, and for the reaction flow pressure is small, because the flow channel design is in the whole On the bipolar plate, this greatly reduces the pressure of the reaction flow in the flow channel, and the water generated by the reaction is prone to be gathered into a large area and is not easy to discharge, which affects the performance and life of the fuel cell

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