Integrated fuel cell unit cell and fuel cell stack

Abstract

The invention relates to an integrated fuel cell single cell and a fuel cell stack. The cell stack is formed by stacking and assembling a plurality of single cells, and each single cell comprises a cathode plate, a proton exchange membrane, an anode plate and a water plate which are stacked in sequence, wherein a catalyst layer and a gas diffusion layer are laminated on the front surface and the back surface of the proton exchange membrane at the flow field positions of the cathode plate and the anode plate, the peripheral side of the proton exchange membrane is fixed in the membrane electrodesupport body, and the proton exchange membrane and the membrane electrode support body form a complete plane; the membrane electrode support body, the proton exchange membrane, the catalytic layer and the gas diffusion layer are clamped between the cathode plate and the anode plate as a whole, and the cathode plate and the anode plate are hermetically connected through injected sealant. Comparedwith the prior art, the cell stack has the advantages of stable structure, excellent sealing performance, good durability, high power generation performance and the like.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to an integrated fuel cell single cell and a fuel cell stack. Background technique [0002] A traditional proton exchange membrane fuel cell forms a single cell by stacking two bipolar plates and a membrane electrode (MEA), and embedding a sealing ring between the bipolar plates and the MEA. Specifically, such as figure 1 , figure 2 As shown, a single fuel cell includes a cathode plate 1, a proton exchange membrane 2, an anode plate 4, and a water plate 6 stacked in sequence. The front and back sides of the proton exchange membrane 2 are provided with a catalytic layer 7 at the position of the flow channel on the bipolar plate. And the gas diffusion layer 8, the electrode plate sealing ring 3 is embedded between the contact surface of the cathode plate 1 and the anode plate 4 and the proton exchange membrane 2, and the water plate sealing ring 5 is embedded between the anode p...

AI Technical Summary

Problems solved by technology

Traditional battery cells use seals (sealing rings) to seal the cathode and anode plates, and there are the following problems: Due to the error in the manufacture of single-piece seals, it is easy to cause dimensional differences in the thickness of each battery cell, and cause uneven force between the surfaces. This further leads to differences in contact resistance between different battery cells, and it is difficult to guarantee the performance consistency between cells when the stack is generating electricity, and the performance of the stack cannot meet the design requirements

At the same time, the contact area between the seal and the membrane electrode assembly is small, so there will inevitably be stress concentration, which may damage the membrane electrode or bipolar plate and other components

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