一种燃料电池双极板变径流场结构及电堆

Abstract

本实用新型涉及燃料电池双极板变径流场结构，包括：阴极流场，阴极流场具有多条蜿蜒延伸的阴极流道，相邻阴极流道之间为阴极脊；阴极流道沿气体流动方向间隔设置若干变径结构，使得该处的阴极流道截面缩小；阳极流场，阳极流场具有多条蜿蜒延伸的阳极流道，相邻阳极流道之间为阳极脊；阳极流场与阴极流场背对设置，两者之间的形成若干冷却液通道。本实用新型的变径结构在阴极流道内形成局部截面收缩，产生压差，迫使气体向相邻流道及脊背区域扩散，对阴极流道的气体扩散进入气体扩散层有促进作用，提高膜电极气体扩散层内的反应物浓度，从而提升电堆反应效率。

Claims

1. A fuel cell bipolar plate variable flow field structure, characterized by: include: The cathode flow field has multiple meandering cathode channels, with cathode ridges between adjacent cathode channels; the cathode channels are provided with several variable diameter structures at intervals along the gas flow direction, so that the cross-section of the cathode channel is reduced at that point. The anode flow field has multiple meandering anode flow channels, with anode ridges between adjacent anode flow channels; the anode flow field and the cathode flow field are arranged back to back, forming several coolant channels between them.

2. The variable flow field structure of a bipolar plate of a fuel cell according to claim 1, wherein The staggered distribution of the variable diameter structures of adjacent cathode channels creates a gas pressure difference at the variable diameter structure of adjacent cathode channels.

3. The variable flow field structure of a bipolar plate of a fuel cell according to claim 1, wherein: The spacing between adjacent variable diameter structures in the cathode flow channel gradually decreases along the gas flow direction.

4. The variable flow field structure of a bipolar plate of a fuel cell according to claim 1, wherein: The inlet section of the cathode flow channel does not have a variable diameter structure, and the density of the variable diameter structure gradually increases along the airflow direction.

5. The variable flow field structure of a bipolar plate of a fuel cell according to claim 1, wherein: The portion of the strain diameter structure on the back side of the cathode flow field and the corresponding portion on the back side of the anode flow field form a connecting channel for connecting two adjacent coolant channels.

6. The variable flow field structure of a bipolar plate of a fuel cell according to claim 1, wherein: The variable diameter structure is a throttling bump that protrudes along the inside of the cathode flow channel.

7. A fuel cell bipolar plate variable flow field structure according to claim 6, wherein: The protrusion height of the throttling bump is 1 / 3 to 2 / 3 of the groove depth of the cathode flow channel.

8. The fuel cell bipolar plate variable flow field structure of claim 6, wherein: The length of the throttling protrusion is 1 mm to 5 mm.

9. The variable flow field structure of a bipolar plate of a fuel cell according to claim 1, wherein: The oscillation direction of the anode flow channel is opposite to that of the cathode flow channel.

10. A stack, characterized by: The variable diameter flow field structure of the fuel cell bipolar plate as described in any one of claims 1-9.

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