Method for designing fuel cell stack integral packaging by using equivalent stiffness mechanical model

Abstract

The invention discloses a method for whole packaging fuel cell stack designed by applying a mechanical model with equivalent stiffness. The method is characterized in that the fuel cell stack is simplified into the mechanical model with equivalent stiffness under the action of packaging force by utilizing the mechanical theory, the corresponding relation between deflection of packaging components and packaging load inside the structure is derived, then the deformational condition caused by temperature of various components after packaging is supplemented and corrected, and finally the optimal packaging parameters of the cell stack are confirmed according to the concrete design requirements. The invention also supplements the conditions that triad membrane electrodes and sealing components of the fuel cell stack with the proton exchange membrane before packaging have different thickness. The invention radically overcomes the defects of great computation load in the finite element method, low flexibility and long design period, simple measurement and computation are only performed, so that the distribution of equivalent stiffness and packaging load inside the structure of the fuel cell stack in the packaging load direction can be obtained, under the condition of ensuring the packaging accuracy, the computation consumption can be enormously reduced, and the design period of packaging the fuel cell stack is shortened.

Description

technical field [0001] The invention belongs to the technical field of fuel cell stack system packaging, and in particular relates to a fuel cell stack packaging design and a method for predicting its internal force. Background technique [0002] Fuel Cell (Fuel Cell) is known as one of the most ideal energy sources in the first 50 years of the 21st century, and is expected to become a new force in mobile and non-mobile energy in the future. Since the fuel cell really stepped out of the laboratory and entered commercial application in the 1960s, how to improve its working efficiency has always been one of the research directions of researchers all over the world. It has been found that the Clamping Force of the fuel cell stack system is an important factor affecting its work efficiency: too small a Clamping Force will increase the contact resistance between component interfaces and cause leakage in the sealing layer, and an excessive Clamping Force will make the Components ...

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Problems solved by technology

[0003] The purpose of the present invention is to establish a fuel cell stack structure packaging design method, which fundamentally overcomes the shortcomings of the finite element method, such as large amount of calculation, poor flexibility, and long design cycle, so that the designer can obtain the fuel cell stack only by simple measurement and calculation. The equivalent stiffness of the battery stack in the package load direction (hereinafter referred to as package equivalent stiffness) and the distribution of package load inside the structure greatly improve design efficiency and save design costs

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