Improved structure of runner plate of fuel cell stack

Abstract

The invention relates to an improved structure of a runner plate of a fuel cell stack, in particular to a runner plate which can be applied to a stack type cell stack or a flat plate type cell stack and can be used as a runner plate with a single-snake runner or multi-snake runners distributed by adopting a non-single-plate structure design; the runner plate is composed of an outer runner plate, an inner runner plate and a runner bottom plate; a plurality of linear or nonlinear runners are arranged on the surface of the outer runner plate in a penetrating manner, and the runners are arranged at intervals; the surface of the inner runner plate is provided with a plurality of converging and discharging holes which are arranged at intervals and correspond to the starting end and the tail endof the runner arranged on the outer runner plate, and the converging and discharging holes are formed by mutually and correspondingly overlapping runner bottom plates; under the configuration that theconverging and discharging holes of the inner runner plate are arranged at the starting end and the tail end of the outer runner plate in a spanning and overlapping manner, the runners and the converging and discharging holes form a common snake-shaped runner; the number of the snake runners can be correspondingly set according to the distribution number of the runners and the distribution lengthand number of the converging and discharging holes, and the purpose of planning a single-snake or multi-snake flow runner can be achieved.

Description

technical field [0001] The present invention provides an improved structure of the flow channel plate of a fuel cell stack, especially a non-single-plate composition that can be used as a single snake flow channel or a multi-snake flow channel, and can be formed by 2D processing technology. The innovative structural design of the flow channel plate reduces the manufacturing cost. Background technique [0002] At present, the general fuel cells on the market are mostly composed of stacked battery stacks or flat battery stacks; the flow channel plates used inside can be divided into unipolar or bipolar according to the needs of use. The above-mentioned unipolar flow channel plate or bipolar flow channel plate are all made of conductive materials such as graphite and metal, and the flow channel set on the surface is a coherent single snake or multi-snake detour mode, as follows: It is integrated into a single plate shape; when it is implemented, because the flow field pressure...

AI Technical Summary

Problems solved by technology

[0002] At present, the general fuel cells on the market are mostly composed of stacked battery stacks or flat battery stacks; the flow channel plates used inside can be divided into unipolar or bipolar according to the needs of use. The above-mentioned unipolar flow channel plate or bipolar flow channel plate are all made of conductive materials such as graphite and metal, and the flow channel set on the surface is a coherent single snake or multi-snake detour mode, as follows: It is integrated into a single plate shape; when it is implemented, because the flow field pressure drop is proportional to the use area, the larger the use area of ​​the fuel cell stack, the more difficult it is to use a single snake flow channel, because the flow field pressure drop is too large. This leads to rupture of the proton exchange membrane or increased power consumption of the system, and the flow channel needs to be manufactured with high-precision stamping and other 3D processing technology to form a detour shape, which requires precise control of the depth, height and width of the flow channel. Completed under the requirements, resulting in high manufacturing costs and many difficulties and other shortcomings; now, the inventor is more familiar with the structure of the existing unipolar or bipolar flow channel plate and its implementation in stacked battery stacks or flat battery stacks The disadvantages caused by the battery are described in detail with examples as follows:

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