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High-integration-level fuel cell bipolar plate for optimizing distribution of reaction gas

A highly integrated fuel cell technology, applied in fuel cells, fuel cell components, battery electrodes, etc., to achieve the effects of increasing specific power density, simple structure, and simplifying water management

Inactive Publication Date: 2014-03-05
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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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The upper mesh porous flow field plate 2 is made of gold-plated nickel foam with a thickness of 0.3mm. The lower metal plate 1 is a gold-plated titanium alloy plate with a thickness of 0.08mm; after the gold-plated titanium alloy plate is punched and formed, the width of the channel is 0.8mm, the depth of the channel is 0.3mm, the width of the protrusion is 0.8mm, and the overall thickness is 0.38mm. The lower metal plate 1 and the upper mesh porous flow field plate 2 are directly stacked together. Before the battery or stack is assembled, the metal plate is not embedded in the mesh porous flow field plate, and the two are realized by the assembly force of the battery or stack. touch.

Embodiment 2

[0023] The upper mesh porous flow field plate 2 is made of carbon-plated stainless steel mesh with a thickness of 0.5mm. The lower metal plate 1 is a carbon-coated 316L stainless steel plate with a thickness of 0.1 mm; after the stainless steel plate is stamped and formed, the width of the channel is 0.4 mm, the depth of the channel is 0.3 mm, the width of the protrusion is 0.4 mm, and the overall thickness is 0.4 mm. The lower metal plate 1 and the upper mesh porous flow field plate are stacked together, and the metal plate is embedded into the mesh porous flow field plate by 20.1 mm by a press under 0.1 MPa. When assembling a cell or stack, it is assembled together with stack components such as membrane electrodes.

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Abstract

The invention provides a high-integration-level fuel cell bipolar plate for optimizing the distribution of reaction gas. According to the high-integration-level fuel cell bipolar plate, the bipolar plate is in a two-layer structure; a lower layer is a metal plate punched with a runner and an upper layer is a net-shaped porous flow field plate; the net-shaped porous flow field plate is a flat plate; the net-shaped porous flow field plate is arranged on the metal plate punched with the runner to form an anode plate or a cathode plate. The high-integration-level fuel cell bipolar plate for optimizing the distribution of the reaction gas has the beneficial effects that the concentration of the reaction gas of a membrane electrode opposite to a convex part of the flow field under a galvanic pile assembling condition can be improved obviously; the effective area of an electrode in a galvanic pile operation process is improved greatly; the output power and the specific power density of a galvanic pile are improved greatly; transition is formed between a microcosmic size pore of electrode carbon paper and the macroscopic size runner of the metal plate by the porous flow field plat, so that the discharging of liquid-state water generated by a reaction is facilitated and the water management of a fuel cell is simplified; materials are simple and novel materials do not need to be explored; the structure is simple and only a conventional structure of an existing fuel cell needs to be improved simply; great influences on the assembling and the structure of the galvanic pile are avoided.

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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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M8/02H01M8/0254H01M8/0256H01M8/0263
CPCY02E60/50H01M4/8621H01M4/8631H01M2004/8694Y02P70/50
Inventor 侯中军付宇明平文
Owner SUNRISE POWER CO LTD
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