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fuel cell unit

A fuel cell and gas diffusion layer technology, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of low cushioning, many energy-consuming processes, and uneven absorption thickness

Active Publication Date: 2022-07-22
NACHI-FUJIKOSHI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Since most of such gas diffusion layers are made of paper, the cushioning ability to absorb uneven thickness is also low, and there are many steps that consume energy, so there is a problem that the production cost is high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0082] Using the GDL of each carbon fiber fabric using the material of the present invention and the comparative material, a fuel cell (hereinafter referred to as "cell") was produced, and the power generation performance of the cell was measured, and the measurement results will be described. The GDL used in this measurement was the GDL of each carbon fiber fabric using two types of the present invention materials (Inventive Materials 1 and 2) and two types of comparative materials (Comparative Materials 1 and 2). Inventive material 1 is figure 1 as well as figure 2 In the GDL of the twill weave shown (the weaving method in which one warp thread passes over three weft threads and then goes under two weft threads), only the warp threads are substantially untwisted threads. In addition, the material of the present invention 2 is the same as the material of the invention 1. figure 1 as well as figure 2 In the twill weave GDL shown, both the warp and weft are substantially u...

Embodiment 2

[0098] Next, in order to compare the ease of flowability of the fluid (water) in each GDL of the material of the present invention and the comparative material, a water flow test was performed. The GDLs used in this test were the present invention material 2 and the comparative material 2 (hereinafter referred to as the present invention material 3 and the comparative material 3) used in Example 1. Figure 12 A schematic plan view of the test apparatus used in this experiment is shown in Figure 13 shown in Figure 12 of the X-X section.

[0099] For this test setup, if Figure 12 as well as Figure 13 As shown in the figure, a GDL with a thickness of 0.1 mm × width 50 mm × length 100 mm is placed on a steel base, and a spacer is placed around the GDL, and the GDL is pressed from above with a transparent resin flat plate and a steel pressing plate. airtight. With regard to a closed GDL, it can be achieved by e.g. Figure 13 The pressure plate with the central opening and t...

Embodiment 3

[0102] Since the difference in the amount of bending under predetermined pressing was measured using the inventive material and the comparative material, the measurement results will be described. In addition, since the same invention material and comparative material were also used for the measurement of the electric power generation performance similar to Example 1, the measurement result is also demonstrated together.

[0103] The GDL used in the measurement of the amount of bending of the GDL in this example and the measurement of the power generation performance is a material obtained by curing both surfaces of the material of the present invention 1 used in Example 1 as the material of the invention (hereinafter referred to as the present invention). Material 4) and a material obtained by curing both surfaces of Comparative Material 1 used in Example 1 with a thermosetting resin (hereinafter referred to as Comparative Material 4) as a comparative material.

[0104] Regar...

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Abstract

According to the present invention, there is provided a carbon fiber fabric for a gas diffusion layer of a fuel cell, which can reduce the thickness of the carbon fiber fabric when it is stacked in a fuel cell and improve the adhesion when the membrane electrode assembly and the separator are sandwiched and stacked. It also has excellent gas diffusivity in the fuel cell and can generate electricity efficiently. The carbon fiber fabric (1) for a fuel cell gas diffusion layer is formed by intertwining the warp (2) and the weft (3), and one of the warp (2) or the weft (3) is substantially untwisted. In addition, on one side of the carbon fiber fabric (1) for a fuel cell gas diffusion layer, the non-twisted yarn above the other yarn (the weft or the warp) interwoven with the warp (2) or the weft (3) as the non-twisted yarn The number of twisted yarns is greater than the number of untwisted yarns positioned below the other yarn.

Description

technical field [0001] The present invention relates to a carbon fiber fabric used for fuel cell gas diffusion layers (sheets) mounted on transportation devices such as vehicles, ships, and airplanes, and a fuel cell unit in which the carbon fiber fabric is embedded as a gas diffusion layer. Background technique [0002] In the past, due to high attention to environmental issues, power generation using fuel cells as a new energy source has attracted attention. Among them, the mainstream domestic and vehicle solid polymer fuel cells (hereinafter referred to as "fuel cells") have the following structures: A membrane electrode assembly (MEA: Membrane Electrode Assembly) in which an electrode catalyst layer is bonded to both sides of a polymer membrane, a gas diffusion layer (GDL: Gas Diffusion Layer) for guiding the fuel gas or oxidant gas to the electrode reaction area, and a gas diffusion layer are repeatedly laminated. A unit module (hereinafter referred to as "fuel cell") c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/96
CPCH01M4/96
Inventor 吉野一郎永井久司熊谷昌信高木顺犬山久夫
Owner NACHI-FUJIKOSHI
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