A positioning device for fuel cell stack assembly

Abstract

The positioning device for assembling the fuel cell stack is an inner positioning device of which the size can be finely adjusted. The positioning device is divided into two parts, namely a supportingmodule and a core body. When the stack is assembled, the inner positioning devices are respectively placed in a common cavity (an air cavity or a water cavity) of the stack, so that an end plate, a bipolar plate, a current collecting plate, a membrane electrode and the like of the stack can be smoothly superposed, and after the superposition of stack components such as the bipolar plate and the current collecting plate is finished, an oil press is used for pressing and the stack is fastened and locked; and the core body of the inner positioning device is taken out, and then the supporting module is taken out to finish the assembly of the stack. The device is simple and flexible in structure, fuel cell stacks of different specifications can be assembled by adjusting the shape and the length of the inner positioning device, the assembly alignment degree of the fuel cell stacks is accurate, and the stability and the safety of the fuel cell stacks are improved.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a positioning device for assembling a fuel cell stack. Background technique [0002] A fuel cell is a device that directly uses hydrogen energy to generate electricity. The chemical energy of hydrogen and oxygen is directly converted into electrical energy. Since it does not go through the Carnot cycle, the energy conversion rate is high; the fuel cell is environmentally friendly, and the only emission is water. Therefore, fuel cell technology is considered to be the preferred clean and efficient power generation technology in the 21st century. [0003] The fuel cell stack is composed of multiple single cells. The stack needs to have a positioning device during assembly. The positioning device ensures that the components of the stack will not be misaligned during assembly. If the positioning fails, it will cause uneven force on the fuel cell stack. , affect the sealing and ev...

AI Technical Summary

Problems solved by technology

Internal positioning is to set positioning holes on the edge of the bipolar plate and MEA, and to achieve positioning through positioning rods passing through the positioning holes. For example, the Chinese invention patent application specification with publication number CN103633359A discloses a fuel cell stack assembly method. This is achieved by restricting the four corners of the stack components with a column, but the aperture of this positioning is small, the positioning rod is thin, and the column is prone to deformation when squeezed, resulting in a certain misalignment of the stack when the stack is assembled; external positioning In order to define each outer surface of the stack through a certain fixing device, for example, the Chinese invention patent application publication number CN 105428688 A discloses a fuel cell stack assembly method by providing a fixing mechanism and a positioning mechanism, but the method requires The bipolar plate of each component of the stack is exactly the same size as the MEA, which has certain limitations

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