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A proton exchange membrane fuel cell bipolar plate with tree-like tapered structure flow field

A proton exchange membrane and fuel cell technology, applied in solid electrolyte fuel cells, fuel cells, fuel cell components, etc., can solve the problem of large pressure drop in serpentine flow field, large pressure drop loss, and uneven distribution of gas concentration and other issues to achieve the effect of improving performance and easy processing

Active Publication Date: 2016-05-18
ZHEJIANG UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in a large-area flow field, the pressure drop of the serpentine flow field is large, and the gas concentration distribution is uneven
[0007] The design of the interdigitated flow field promotes the forced convection of the reaction gas in the diffusion layer, and its water management effect is far better than that of the parallel flow field and the serpentine flow field, but the forced convection in the gas diffusion layer leads to a large pressure drop loss

Method used

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  • A proton exchange membrane fuel cell bipolar plate with tree-like tapered structure flow field
  • A proton exchange membrane fuel cell bipolar plate with tree-like tapered structure flow field
  • A proton exchange membrane fuel cell bipolar plate with tree-like tapered structure flow field

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Embodiment 1

[0029] like figure 1 Shown: a proton exchange membrane fuel cell bipolar plate with a tree-like tapered structure flow field, the two plates of the bipolar plate include a reaction gas inlet 1 and a reaction gas outlet 6 and a gas flow field.

[0030] The gas flow field is a circular interdigitated flow field, including a main air intake channel 2 , a plurality of branch air intake channels 3 , a main air outlet channel 5 , and a plurality of branch air outlet channels 4 . The reaction gas inlet 1 and the reaction gas outlet 6 are both flow fields in a tree structure, in which the reaction gas inlet 1 is connected to the main intake channel 2, and the main intake channel 2 is connected to the intake branch flow channel 3; The branch channel 4 is connected with the main gas outlet channel 5 , and the reaction gas outlet 6 is connected with the main gas outlet channel 5 .

[0031] image 3 It is a three-dimensional structural schematic diagram of the inlet / outlet flow channel ...

Embodiment 2

[0052] In this embodiment, the structure of the bipolar plate surface is as follows figure 2 As shown, most of the structures are the same as those in Embodiment 1, the only difference is that the outlet branch flow channel 4 is located at the outermost circle of the circular flow channel.

[0053] In practical applications, the two structures of Embodiment 1 and Embodiment 2 can be used in combination with each other. Different combinations have different heat distribution and water distribution, which are suitable for different application environments.

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Abstract

The invention relates to a bipolar plate with a flow field in a tree-shaped gradually-shrinking structure for a PEMFC (proton exchange membrane fuel cell). According to the bipolar plate, two surfaces of the bipolar plate are respectively provided with reaction gas inlets, reaction gas outlets and gas flow fields, wherein each gas flow field is a round interdigital flow field, the flow fields at the reaction gas inlets and the reaction gas outlets are tree-shaped, flow channels in the flow fields are in equal-proportion gradually-shrinking structures. With the adoption of the gradually-shrinking design, the forced convection of the interdigital flow field is enhanced, and the chemical reaction rate of the cell is improved; the separate tree-shaped structures can overcome the defect of high pressure drop of the interdigital flow field, so that reaction gas can be uniformly distributed in the flow channels, and the whole performance of the battery can be promoted.

Description

technical field [0001] The invention relates to a bipolar plate of a proton exchange membrane fuel cell, in particular to a bipolar plate of a proton exchange membrane fuel cell based on a tree-like bionic circular tapered interdigitated flow field structure. Background technique [0002] Proton exchange membrane fuel cell (ProtonExchangeMembraneFuelCell, PEMFC) has considerable market application prospects because of its high energy conversion rate, no pollution, fast start-up and other advantages. Compared with a heat engine, the chemical energy of a fuel cell is directly converted into electrical energy without the need for an initial conversion into heat. Therefore, the conversion is not limited by the Carnot cycle, and theoretically a high conversion efficiency of 90% can be achieved. [0003] The bipolar plate, also known as the collector plate, is an important part of the fuel cell. It needs to meet the following requirements: (1) to realize the electrical connection...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/86H01M8/0202H01M8/0258H01M8/10
CPCH01M8/026H01M8/0263H01M8/0265Y02E60/50
Inventor 鲁聪达吴明格文东辉贾虹姜少飞柴国钟
Owner ZHEJIANG UNIV OF TECH
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