Fuel cell assembly, fuel cell and preparation process thereof

Abstract

The invention provides a fuel cell assembly, a fuel cell and a preparation process thereof. The fuel cell assembly at least comprises two membrane electrode assemblies and three bipolar plates, each membrane electrode assembly is clamped between the two bipolar plates, and the periphery of each membrane electrode assembly and the adjacent bipolar plate are sealed. By adopting the assembly mode ofthe three bipolar plates and the two membrane electrode assemblies, a double-cell unit structure can be formed, the usage amount of the bipolar plates is reduced, the thickness of the cell unit is reduced, the mass and volume specific power of a stack are increased, and the stack assembly efficiency is improved.

Description

technical field [0001] The application belongs to the technical field of fuel cells, and in particular relates to a fuel cell component, a fuel cell and a preparation process thereof. Background technique [0002] A fuel cell is an energy conversion device that converts chemical energy in fuel into electrical output. A single cell is mainly composed of bipolar plates, membrane electrodes, and seals. Multiple single cells can be stacked in series to form a stack structure, thereby increasing the output voltage and power. The weight and volume specific power of the stack are important indicators for judging the performance of the stack. A traditional battery unit is assembled from two bipolar plates, a membrane electrode assembly and a seal, and its volume specific power and weight specific power are often affected by the battery unit. Due to structural limitations, it can only be fine-tuned, and the performance cannot be greatly improved. Therefore, to load a stack that can...

AI Technical Summary

Problems solved by technology

However, the existing bipolar plates are limited by the processing technology, sealing technology, mold precision, design dimension interference, etc., and cannot guarantee the flow uniformity of the gas side and the water side at the same time, or require additional manufacturing processes, materials and equipment, which increases the Manufacturing difficulty and cost

[0004] In addition, fuel cells have high requirements for sealing. However, the traditional silicone gasket extrusion sealing method is poor in shock resistance and temperature resistance, and it is prone to misalignment during assembly. Leakage on the gas side and water side must be continuously detected during the assembly process. The assembly efficiency is low and the reliability is insufficient. If there is gas side or water side leakage, etc., it will seriously affect the performance and life of the battery

Therefore, with the development of technology, the bonding and sealing method is gradually applied. However, most manufacturers use injection molding and other processes for bonding and sealing. The cost of production equipment is high, the requirements for the environment and process are high, and the speed is slow, which limits the production efficiency of fuel cells. , which increases the cost of production

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