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Proton exchange membrane fuel cell metal bipolar plate and its stack

A technology of metal bipolar plates and proton exchange membranes, applied in fuel cells, battery electrodes, circuits, etc., to achieve the effects of improving performance and life, good contact, and prolonging service life

Inactive Publication Date: 2016-08-31
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a metal bipolar plate of a proton exchange membrane fuel cell and the electric stack formed thereof, so as to solve technical problems such as mechanical extrusion and stress relaxation in the proton exchange membrane fuel cell, thereby overcoming The disadvantages of the above-mentioned prior art

Method used

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  • Proton exchange membrane fuel cell metal bipolar plate and its stack
  • Proton exchange membrane fuel cell metal bipolar plate and its stack
  • Proton exchange membrane fuel cell metal bipolar plate and its stack

Examples

Experimental program
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Embodiment 1

[0033] Embodiment 1. Proton exchange membrane fuel cell metal bipolar plate:

[0034] A metal plate (such as a stainless steel plate) with a size of 400mm×100mm and a thickness of 0.1-0.3mm is stamped into an anode unipolar plate by a stamping process. The structure of the anode unipolar plate is as figure 1 As shown, the left side of the board is provided with a fuel gas chamber 1, a cooling medium chamber 3 and an oxidant gas chamber 2 arranged from top to bottom, and the right side of the board is provided with an oxidant gas chamber arranged from top to bottom. The cavity 2, the cooling medium cavity 3 and the fuel gas cavity 1 are provided with an anode plate flow field area 4 in the middle of the plates. The dimensions of the fuel gas cavity, the cooling medium cavity and the oxidant gas cavity are all 20mm×20mm, and the area of ​​the flow field area of ​​the anode plate is 320mm×80mm. The anode plate flow field area 4 contains 21 anode plate bosses 5 and 20 anode plat...

Embodiment 2

[0038] Embodiment 2. A proton exchange membrane fuel cell stack composed of metal bipolar plates:

[0039] The proton exchange membrane fuel cell stack composed of the above-mentioned metal bipolar plates with an appearance size of 400mm×100mm and a plate thickness of 0.2-0.6mm is composed of 100 single cells stacked in series ( Figure 6 ), insert seals (such as silicone rubber seals) between the single cells, press the front and rear end plates (such as copper plates) and then fasten them with screws to form a proton exchange membrane fuel cell stack. Each single cell is composed of an anode unipolar plate 10 , a cathode unipolar plate 11 and a membrane electrode assembly, wherein the membrane electrode assembly is clamped between the anode unipolar plate 10 and the cathode unipolar plate 11 . The membrane electrode assembly is formed by hot pressing in the order of gas diffusion layer 16 , catalyst layer 17 , proton exchange membrane 18 , catalyst layer 17 and gas diffusion...

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Abstract

The invention provides a metal bipolar plate for a proton exchange membrane fuel battery and an electric pile formed by the metal bipolar plate. The metal bipolar plate is formed through the combination of a cathode unipolar plate and an anode unipolar plate made of thin metal plates, wherein the cathode unipolar plate and the anode unipolar plate are arranged in a back-to-back way, fuel gas cavities (1), cooling medium cavities (3) and oxidant gas cavities (2), which are correspondingly coincided are arranged on both the left sides and the right sides of the plate bodies of the cathode unipolar plate and the anode unipolar plate, flow field zones are arranged in the middles of the plate bodies, and a plurality of arc-shaped bosses and a plurality of arc-shaped grooves, which correspond to each other, are arranged in the flow field zones. The electric pile is formed through the overlapping of a plurality of single batteries which are connected in series, and each single battery consists of the cathode unipolar plate, the anode unipolar plate and a membrane electrode assembly between the cathode unipolar plate and the anode unipolar plate. The great contact of the metal bipolar plate with the membrane electrode assembly is well ensured through the self elastic deformation of the metal bipolar plate. The stress relaxation of the electric pile can be automatically compensated, and clamp force for the normal work of the electric pile can be maintained, so that the performance and the service life of the proton exchange membrane fuel battery are improved and prolonged.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, and in particular relates to a metal bipolar plate of a proton exchange membrane fuel cell and an electric stack composed of the metal bipolar plate. Background technique [0002] Proton exchange membrane fuel cell is a power generation device that uses hydrogen or methanol as fuel, oxygen or air as oxidant, and converts chemical energy stored in fuel and oxidant directly into electrical energy. Proton exchange membrane fuel cells have the advantages of high energy conversion efficiency, environmental friendliness, low temperature and fast start-up, etc., and have broad application prospects. The bipolar plate is one of the core components of the proton exchange membrane fuel cell. It has important functions such as supporting the membrane electrode assembly, uniformly distributing the reaction gas, collecting and conducting electricity, discharging the reaction water and dissipating heat. Me...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/86H01M8/249H01M8/247H01M8/2485
CPCH01M4/8631H01M8/249Y02E60/50
Inventor 罗志平郭骏罗玄詹志刚
Owner WUHAN UNIV OF TECH
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