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Cathode-to-cathode fuel cell stacks

一种燃料电池、阴极的技术，应用在燃料电池分组、燃料电池、燃料电池助剂等方向，达到减少阴极端、减轻性能损失、缩短起动时间的效果

Inactive Publication Date: 2007-10-24
INT FUEL CELLS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Shutdown procedures are known to be taken, including draining, to reduce the amount of water in the fuel cell, however, it will still be in the MEA and in the coolant channels of the reactant gas channel plate (if such coolant channels are used) leave some water

Method used

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  • Cathode-to-cathode fuel cell stacks
  • Cathode-to-cathode fuel cell stacks
  • Cathode-to-cathode fuel cell stacks

Examples

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Embodiment Construction

[0017] Referring to FIG. 1 , a fuel cell power plant 6 according to the present invention includes a pair of fuel cell stacks 8 , 9 whose cathode terminals 11 , 12 are connected to a common current collector 15 and current output bus bar 16 . The ends of each stack 8, 9 have respective pressure plates 19, 20 (sometimes referred to as "end plates"). In this configuration, the platens 19 , 20 also function as current collectors and each platen has an anode current output bus bar 22 . In this configuration, tie rods (not shown for clarity) secure the two stacks together by tightening the pressure plates 19 , 20 .

[0018] In this configuration, a fitting 24 for the internal manifold is shown. External manifolds are not shown for the sake of clarity, and the external manifolds may be provided, for example, at the top and bottom of the stack or at the front and rear of the stack, or at both the top and bottom of the stack as well as at the front and rear of the stack . Various c...

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PUM

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Abstract

A plurality of fuel cell stacks ( 8, 8 a , 9, 9 a) have their cathode ends ( 11, 12 ) contiguous with either a common current collector ( 15 a- 15 d) or respective current collectors ( 15 a , 15 b) which may be separated by electrical isolation ( 27 a , 27 b). The cathode-to-cathode relationship protects the cathode of each of the stacks from cold ambient environments, thereby permitting improved cold starts and mitigation of performance loss as a result of cold starts as well as freeze / thaw cycles. Heaters ( 30, 30 a- 30 d) may be provided in current collectors, or in or between electrical isolation. Four stacks may share one current collector, or each may have its own current collector.

Description

technical field [0001] The present invention relates to stacks of multiple fuel cells with their cathode terminals contiguous to reduce exposure of the cathode terminals to cold temperatures, thereby reducing start-up time and loss of performance due to cold cathodes during start-up and freeze / thaw cycles; An optional heater can be used. Background technique [0002] Subfreezing temperatures for polymer electrolyte proton exchange membrane (PEM) fuel cells are known to cause delays in start-up and loss of fuel cell performance (voltage at any current density). Performance loss is caused by water freezing on the MEA surface and in the gas diffusion layer, which prevents the contact of the reactant gases with the catalytic surface of the MEA. Another reason is that the water produced by the electrochemical reaction (generated water) freezes at the cathode, thereby restricting or completely blocking the passage of the oxidant gas and greatly reducing the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/04
CPCH01M8/04007H01M8/249H01M8/04253Y02E60/50H01M8/24
Inventor G·雷斯尼克J·S·易T·塔尼古基A·梅卡瓦
Owner INT FUEL CELLS
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