Method and device for calculating assembly force of proton exchange membrane fuel cell stack

Abstract

The invention discloses a method and a device for calculating the assembly force of a proton exchange membrane fuel cell stack. The method comprises the steps of separately sealing a hydrogen side and an oxygen side of a bipolar plate of a fuel cell stack to be tested; applying a group of pressures to the stack by using an electronic universal tester; acquiring and recording a corresponding bipolar plate and MEA (Membrane Electrode Assembly) contact state image under each pressure; acquiring pressure distribution data of all bipolar plate and MEA contact points under different pressures based on the contact state images; acquiring pressure values of all the contact points based on the pressure distribution data; meanwhile, judging the positions of a sealed area and a flow field area of the bipolar plate; acquiring a relation curve of pressure values borne by the sealed area and the flow field area separately under different pressures based on the pressure values of all the contact points and the positions of the sealed area and the flow field area; searching the minimum of the pressure when the contact resistance is a constant and finding out the pressure corresponding to the minimum, wherein the pressure is the assembly force of the stack. The method and the device can conveniently and accurately calculate the assembly force of the proton exchange membrane fuel cell stack.

Description

technical field [0001] The invention relates to the field of fuel cell testing methods, in particular to a method and device for estimating assembly force of a proton exchange membrane fuel cell stack. Background technique [0002] The core components of the proton exchange membrane fuel cell stack are the membrane electrode assembly (MEA) and the bipolar plate, and the matching relationship between the MEA and the bipolar plate is the key to the assembly of the stack, so the relationship between the two The pressing force must be within a certain pressure range to ensure the sealing performance of the stack and the internal resistance of the battery. [0003] In the prior art, in order to ensure good contact between the MEA and the bipolar plate of each single cell in the stack, usually after the MEA preparation process is finalized, the MEA and the bipolar plate with a flow field or a part thereof are pressed against each other. Contact resistance test. When the relation...

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Problems solved by technology

[0004] But in fact, due to factors such as the different sealing structures of the stacks and the contact state between the MEA and the bipolar plate, there are certain differences in the force of the stacks. If the existing technical means are completely adopted, then The assembly force of the stack must be too high or too low. When the assembly force is too high, it will cause mutual deformation or even damage between the MEA and the bipolar plate, which will seriously affect the performance of the fuel cell stack. And life, when the assembly force is low, the contact between the bipolar plate and the MEA will be insufficient, and the internal resistance of the stack will increase

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