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Fuel cell metal bipolar plate for reinforcing distribution of reactant gas

A metal bipolar plate and fuel cell technology, which is applied to fuel cell components, battery electrodes, circuits, etc., to avoid defects, simplify materials, and increase the effective area.

Active Publication Date: 2014-03-12
SUNRISE POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a fuel cell bipolar plate that strengthens the distribution of reaction gas, and overcomes the shortcomings of the existing bipolar plate

Method used

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  • Fuel cell metal bipolar plate for reinforcing distribution of reactant gas

Examples

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Effect test

Embodiment 1

[0027] The upper flow field plate 1 is molded into a flow channel shape by a porous metal sheet; the metal material is titanium alloy, and the surface is gold-plated; the thickness of the porous metal sheet is 0.05mm, the size of the holes on the plate is Φ0.2mm, and the distance between the centers of adjacent holes is 0.3mm; After the flow field, the width of the flow channel is 0.3mm, the depth of the flow channel is 0.3mm, the width of the protrusion is 0.3mm, the height of the protrusion is 0.3mm, and the overall thickness of the flow field is 0.35mm. The thickness of the lower metal sheet is 0.08mm, and the material is a gold-plated titanium alloy plate. The lower metal thin plate 2 and the upper flow field plate 1 are joined by fiber laser welding. Example 2:

Embodiment 2

[0028] The upper flow field plate 1 is molded into a flow channel shape by a porous metal sheet; the metal mesh is made of 316L stainless steel with a carbon layer on the surface; the thickness of the 316L stainless steel plate is 0.1mm, the size of the holes on the plate is 0.1mm, and the distance between the centers of adjacent holes is 0.3mm; After stamping into the flow field, the width of the flow channel is 0.4mm, the depth of the flow channel is 0.2mm, the width of the protrusion is 0.1mm, the height of the protrusion is 0.2mm, the overall thickness of the flow field is 0.3mm, the thickness of the lower metal layer is 0.1mm, and the material is 316L Stainless steel with carbon coating. The lower metal thin plate 2 and the upper flow field plate 1 are pressed together by stack assembly force.

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Abstract

A fuel cell metal bipolar plate for reinforcing the distribution of a reactant gas comprises a positive plate with a flow field and a negative plate with a flow field, each of the positive plate and the negative plate adopts a double-layer structure comprising a lower-layer metal sheet and an upper-layer flow field plate, the lower-layer metal sheet is a flat plate, the upper-layer flow field plate is a runner-shaped plate formed through mould pressing of a porous metal sheet, and the upper-layer flow field plate is arranged on the lower-layer metal sheet or fixed on the lower-layer metal sheet. The fuel cell metal bipolar plate has the benefits that the concentration of the reactant gas of a membrane electrode corresponding to a bulged part of the flow field is increased, the effective area of the membrane electrode in the operating process of an actual electric pile is increased, and the property and specific power density of the electric pile are substantially improved; the thickness and weight of the flow field plate and the metal sheet are controlled to a very low level, the volumetric specific power and gravimetric specific power are increased, the defects, stress and the like of the metal sheet in the stamping process are avoided, the reliability is high, the materials are simple, no novel material needs to be developed, the fuel cell metal bipolar plate is simple in structure and is only simply improved on the basis of the regular structure of a fuel cell, and the assembly and structure of the electric pile are not greatly affected.

Description

technical field [0001] The invention belongs to the field of fuel cell technology, in particular to a fuel cell bipolar plate suitable for high current density operation. Background technique [0002] Proton exchange membrane fuel cell bipolar plates are mainly divided into three categories: 1. Bipolar plates that mechanically engrave a flow field on a hard graphite plate; 2. Bipolar plates that punch out a flow field from a thin metal plate; 3. Carbon powder , resin, etc. are mixed and then molded to form a bipolar plate. In addition, there are expanded graphite impregnated with resin and then stamped into bipolar plates. [0003] The disadvantage of the bipolar plate in the prior art is: the reaction gas concentration on the membrane electrode corresponding to the bipolar plate flow field protrusion is very small, and this part of the battery area contributes little to the overall performance, which affects the effective improvement of battery performance . The reason f...

Claims

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Application Information

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IPC IPC(8): H01M4/86H01M8/02
CPCY02E60/50H01M4/8605H01M4/8631H01M8/0202
Inventor 侯中军付宇明平文
Owner SUNRISE POWER CO LTD
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