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fuel cell stack

A technology for fuel cell stacks and membrane electrode assemblies, which is applied to fuel cells, fuel cell components, circuits, etc., and can solve problems such as increased pressure loss of coolants and decreased cooling performance of fuel cell stacks

Active Publication Date: 2022-07-08
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the pressure loss of the coolant may be partially increased, and then the cooling performance of the fuel cell stack may decrease

Method used

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Experimental program
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Embodiment Construction

[0028]figure 1 It is an exploded perspective view of one unit cell 60 of a fuel cell stack (hereinafter referred to as a battery pack) 1 . The battery pack 1 is constructed by stacking a plurality of unit cells 60 . exist figure 1 , only one unit cell 60 is shown, and the other unit cells are omitted. The unit cell 60 is figure 1 are stacked with other unit cells in the Z direction shown in . The unit cells 60 have a substantially rectangular shape. The longitudinal and short directions of the unit cells 60 correspond to figure 1 The Y and X directions are shown.

[0029] The battery pack 1 is a polymer electrolyte fuel cell that generates electricity using supplied anode gas (eg, hydrogen gas) and cathode gas (eg, oxygen gas) as reaction fluids. The unit cell 60 includes a membrane electrode gas diffusion layer assembly 20 (hereinafter referred to as MEGA (Membrane Electrode Gas Diffusion Layer Assembly)), an anode separator 33a and a cathode separator 33c (hereinafter ...

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Abstract

The present invention relates to fuel cell stacks. The first and third fluid groove portions face each other in the stacking direction in which the membrane electrode assembly and the first and second separators are stacked, the second and fourth fluid groove portions face each other in the stacking direction, the first and the second coolant groove portions face each other in the stacking direction and define a common coolant flow path, the first fluid groove portion includes a wide portion in which the groove width of the first fluid groove portion is determined by partially increased, the second fluid groove portion includes a narrow portion in which the groove width of the second fluid groove portion is partially reduced, the wide portion of the first fluid groove portion is joined to the third The fluid groove portion, the groove width of the portion of the third fluid groove portion that is joined to the wide portion of the first fluid groove portion is larger than the width of the first fluid groove portion excluding the wide portion of the first fluid groove portion. The outer part of the groove width, and the wide part of the first fluid groove part is adjacent to the narrow part of the second fluid groove part through the first coolant groove part.

Description

technical field [0001] The present invention relates to a fuel cell stack. Background technique [0002] A fuel cell stack is known in which membrane electrode assemblies and pairs of two separators joined to each other are alternately stacked. A gas groove portion is formed on each surface of the side of the separator facing the membrane electrode assembly, the reaction gas flows along the gas groove portion, and a coolant groove portion is formed on each of the opposite surfaces, cooling The coolant flows along the coolant groove portion. For example, in Japanese Unexamined Patent Application Laid-Open No. 2014-175208, a portion where the groove width of the gas groove portion is partially increased in one of the two partitions is joined to the other partition The part in which the groove width of the gas groove part in the part is partially increased. This ensures the bonding strength between the spacers. [0003] Regarding Japanese Unexamined Patent Application Laid-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/026H01M8/0265H01M8/2483H01M8/2457
CPCH01M8/026H01M8/0265H01M8/2483H01M8/2457H01M8/0267H01M8/0254H01M8/0297H01M2008/1095Y02E60/50H01M8/1004
Inventor 加藤学青野晴之
Owner TOYOTA JIDOSHA KK