Structure of double-swallow-tail shape flow field plate for proton exchange membrane fuel cell

Abstract

This invention relates to a multi-channel double dovetailed flow field plate used in proton exchange film fuel battery including a hydrogen inlet, a hydrogen outlet, an air inlet, an air outlet, a diversion slot connecting the gas inlet-out and a cooling water flowing slot on it. A pair of hydrogen inlet-out and a pair of air inlet-out are set on the flow field plate in the shape of non-hemisphere and the diversion slot is in a streamlined multi-channel double dovetailed flow field structure.

Description

technical field [0001] The invention relates to the application field of fuel cell technology, in particular to a structure of a double dovetail flow field plate for a proton exchange membrane fuel cell. Background technique [0002] A fuel cell is an efficient and environmentally friendly power generation device that converts chemical energy in fuel and oxidant directly into electricity. It is not limited by the Carnot cycle, has high energy conversion efficiency, and has no pollution to the environment. Among many types of fuel cells, the proton exchange membrane fuel cell (PEMFC) has broad application prospects. It can be started at low temperature, has no electrolyte loss, simple structure, and easy operation. preferred energy source. [0003] Proton exchange membrane fuel cell (PEMFC) uses perfluorosulfonic acid type proton exchange membrane as electrolyte, Pt / C, Pt-Ru / C or nanomolybdenum dioxide as electrocatalyst, hydrogen or purified reformed gas as fuel, air or P...

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Problems solved by technology

(2) Point-shaped flow field plate: The advantage of this flow field plate is that it is simple in structure, but short-circuit phenomenon is prone to occur when the fluid flows through the flow field plate, so that part of the flow field plate is not used, thus affecting the performance of the battery

[0008] Some patents have more or less deficiencies: For example, the Asia-Pacific Fuel Cell Technology Co., Ltd. in Taiwan applied for the patent of the flow field plate of the fuel cell in my country (patent number: 01124227.0 and 01124228.0); the United Signal Corporation of the United States applied for it in my country (Patent No.: 00814108.8) fuel cell and flow field plate patents for fuel cells, etc.

For example, the airflow distribution of the flow field plate is not uniform enough; the water generated by the reaction is easy to accumulate and difficult to discharge, and the design of the flow field structure is easy to cause reaction dead zone, voltage instability, etc., which affect the normal operation performance of the battery

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