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Polymer electrolyte fuel cell

A polymer electrolyte and fuel cell technology, applied in solid electrolyte fuel cells, fuel cells, fuel cell grouping, etc., can solve problems such as uneven contact pressure

Active Publication Date: 2009-09-23
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0020] The present invention was made in order to solve the above problems, and its object is to provide a polymer electrolyte fuel cell that reduces the unevenness of contact pressure between the membrane electrode assembly and the separator, and provides a Polymer electrolyte fuel cell with fastening structure in which sealing members arranged between separators apply appropriate fastening force

Method used

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Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0071] A schematic perspective view showing the structure of a fuel cell 101, which is an example of a polymer electrolyte fuel cell (PEFC) according to an embodiment of the present invention, in a partially disassembled state is shown in figure 1 middle. Such as figure 1 As shown, the fuel cell 101 is formed by stacking a plurality of unit cell modules. Additionally, the figure 1 A partial schematic cross-sectional view (cross-sectional view along line II-II) of the peripheral portion of the unit cell module in the fuel cell 101 is shown in figure 2 middle.

[0072] Such as figure 1 As shown, the fuel cell 101 is configured as follows: in a state where a plurality of unit cell modules 11 serving as a unit structure of a power generating device in the fuel cell are stacked, a pair of collector plates 12 and end plates are arranged at both ends. 13 and sandwich it, and fasten it with fastening screws 14 and nuts 15 (an example of fastening members) penetrating the screw h...

Embodiment 1

[0101] Here, will figure 1 The fastening structure of the above-mentioned embodiment is used as Example 1, and the arrangement relationship of the outer spring 21 and the inner spring 22 in the end plate 13 is shown in Figure 4A middle. Such as Figure 4A Shown, in the fastening structure of embodiment 1, such as figure 1 and Figure 3A As shown, 25 inner springs 22 are arranged in the recess 23 between the end plate 13 and the collector plate 12 . As the inner spring 22, a spring having a spring constant of 7 kgf / mm was used, and a load of 840 kgf was generated by shrinking 4.8 mm from the free length. In addition, at the four corners of the outer surface of the end plate 13, as the outer spring 21, a spring with a spring constant of 50 kgf / mm is used, and it is compressed by 5 mm from the free length with four fastening screws 14 to generate a spring of 1000 kgf. Load, tighten with nut 15.

[0102] In addition, in order to confirm the pressure distribution in the elec...

Embodiment 2

[0106] Next, a schematic diagram of the arrangement structure of the outer spring 21 and the inner spring 22 in the fastening structure of Embodiment 2 of the present invention is shown in Figure 6A middle.

[0107] Such as Figure 6A As shown, in Example 2, instead of disposing the outer springs 21 at the corners of the end plate 13 , four outer springs 21 are disposed near the midpoint positions of the edges of the rectangular end plate 13 . In addition, the respective inner springs 22 are not evenly arranged in the electrode arrangement region R2, but are arranged such that their centers are located in the electrode arrangement region R2 inside the quadrilateral formed by the line segments L1 connecting the four outer springs 21. The inner spring 22 is arranged. Furthermore, a plurality of inner springs 22 are arranged on a diagonal line L2 of a quadrilateral formed by line segments L1 connecting the four outer springs 21 . First, one inner spring 22 is arranged at the ...

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Abstract

A polymer electrolyte fuel cell is formed by a fuel cell stack assembled by cramping a plurality of layered single cell modules via a pair of end plates by a plurality of cramping members. The polymer electrolyte fuel cell includes: a plurality of first elastic members each arranged between the cramping member and the end plate; and a plurality of second elastic members each arranged between the end plate and the fuel cell stack end portion. The respective second elastic members are arranged on the end plate surface equivalent to an electrode portion of a film electrode assembly in the respective single cell modules while the respective first elastic members are arranged on the end plate surface equivalent to an arrangement region of a seal member arranged between the rim portion of the film electrode assembly and a pair of separator plates.

Description

technical field [0001] The present invention relates to a fuel cell used in a portable power supply, a power supply for an electric vehicle, and a household industrial waste heat power generation system, etc., and particularly relates to a polymer electrolyte fuel cell using a polymer electrolyte. Background technique [0002] A fuel cell using a polymer electrolyte generates electricity and heat simultaneously by electrochemically reacting a fuel gas containing hydrogen and an oxidant gas containing oxygen such as air. The fuel cell basically includes a polymer electrolyte membrane that selectively transports hydrogen ions, and a pair of electrodes, namely, a positive electrode and a negative electrode, formed on both sides of the polymer electrolyte membrane. These electrodes have a catalyst layer formed on the surface of the polymer electrolyte membrane mainly composed of carbon powder carrying a platinum group metal catalyst, and a catalyst layer arranged on the outer su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/24H01M8/10
CPCH01M8/0273Y02E60/521H01M8/248H01M8/242H01M8/1002H01M8/241H01M8/0263H01M8/0267H01M8/1007H01M8/2483Y02E60/50H01M8/10H01M8/24
Inventor 松本敏宏日下部弘树吉村光生山口曜子长尾善辉
Owner PANASONIC CORP
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