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A flow field plate for fuel cell

A fuel cell and flow field plate technology, which is applied in the direction of fuel cells, fuel cell parts, battery electrodes, etc., can solve the problem of uneven electrochemical reaction intensity

Inactive Publication Date: 2007-04-25
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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Problems solved by technology

[0007] In order to overcome the problem of uneven electrochemical reaction intensity in the electrochemical reaction area in the prior art, the present invention proposes a flow field plate for fuel cells, by adjusting the channel spacing, to change the flow rate in the entire electrochemical reaction area. channel distribution density, so that the electrochemical reaction intensity is uniform everywhere in the electrochemical reaction zone

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  • A flow field plate for fuel cell
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Embodiment Construction

[0017] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0018] As shown in FIG. 3 , the flow field plate 201 of the present invention includes at least one channel 205 extending from the fluid source 203 to the fluid outlet 204 , and the channels 205 are non-uniformly distributed in the electrochemical reaction zone. Near the source 203 of the fluid, the channel spacing is relatively large, and the channel distribution density is relatively small; near the fluid outlet 204, the channel spacing is relatively small, and the channel distribution density is relatively large. In the electrochemical reaction zone, the cross-sectional area of ​​the channel 205 remains unchanged, while the width and depth of the channel 205 remain unchanged along its length direction.

[0019] As shown in FIG. 1 , a is the channel width, and b is the channel pitch. The ratio of the channel pitch b to the channel width a is...

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Abstract

The invention relates to a flow field plate used in fuel battery, which comprises at least one groove (205) extending from fluid source (203) to fluid outlet (204); the groove distance b and the groove width is rationed from 0.3-3; the groove distance b meets following conditions that (1), the difference between maximum and minimum of same groove distance b is larger than 6% of minimum; (2), at least two differences are larger than 6% of minimum; the groove (205) is not uniformly distributed in whole electromechanical reaction area that higher near the fluid source (203) and lower near the fluid outlet (204); the groove section (205) is not changed along fluid direction, while its route can be any one in present flow field.

Description

technical field [0001] The invention relates to a fuel cell flow field plate, in particular to a flow field plate applicable to a proton exchange membrane fuel cell. Background technique [0002] A fuel cell is a device in which a fuel and an oxidant are combined in a controlled manner to directly generate electricity. Because the chemical energy of fuel and oxidant is directly converted into electrical energy, no intermediate combustion steps are required, and it is not limited by the Carnot cycle. The electrical efficiency is higher than that of traditional power generation devices. In addition, it has many characteristics such as low operating noise, environmental protection and easy maintenance. In recent years, Much attention. [0003] Although fuel cells have many advantages, there are still many problems to be solved in terms of technology and cost. Among them, how to solve the uneven concentration distribution of the reaction fluid is a problem. A fuel cell is mad...

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Application Information

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IPC IPC(8): H01M8/02H01M4/86H01M8/0258
CPCY02E60/50
Inventor 徐鲁宁韩立冯之钺
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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