Fuel cell stack assembly method

Abstract

The invention discloses a fuel cell stack assembly method which comprises the steps of (S1) stacking stack components in order, (S2) adjusting the positions of the components by positioning holes, (S3) applying a small amount of torque and fixing the components including the steps of threadingly connecting and fixing fastening nuts to positioning columns, applying a small amount of torsion force to fix the stack components including a stack lower end plate, a lower collecting plate, a stack single cell, an upper collecting plate and a stack upper end plate through the positioning columns, and(S4) horizontally placing the stack components. In the invention, according to the fuel cell stack assembly method, the small amount of torque is applied in step (S3), after the components are fixed,the stack components are horizontally placed through the step (S4), then the lateral assembly is used to uniformly apply pressure in each direction, therefore, the uniform stress of each position of astack is ensured, the compression of a membrane electrode is consistent, the flow resistance distribution is more uniform, and the simulation and analysis of the stack are facilitated.

Description

technical field [0001] The invention relates to the technical field of battery stacks, in particular to a fuel cell stack assembly method. Background technique [0002] A fuel cell is a chemical device that directly converts the chemical energy of fuel into electrical energy, also known as an electrochemical generator. It is the fourth power generation technology after hydropower, thermal power and atomic power. Since the fuel cell converts the Gibbs free energy in the chemical energy of the fuel into electrical energy through an electrochemical reaction, it is not limited by the Carnot cycle effect, so the efficiency is high; in addition, the fuel cell uses fuel and oxygen as raw materials; at the same time There are no mechanical transmission parts, so there is no noise pollution, and the emission of harmful gases is very small. It can be seen that from the point of view of saving energy and protecting the ecological environment, fuel cells are the most promising power g...

AI Technical Summary

Problems solved by technology

[0003] As the fuel cell stack power requirements are getting higher and higher, the number of bipolar plates is also increasing. With the traditional vertical assembly, with the increase of the power of the stack, the membrane electrodes at the bottom of the stack are subject to assembly pressure. To bear the weight of the upper bipolar plate and the end plate, the compression will have a large change, and the excessive compression of the membrane electrode will lead to the blockage of gas transmission, which will lead to the reduction of the performance and life of the stack

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