Horizontal stacking press-fitting machine for fuel cell stacks

Abstract

The invention discloses a horizontal stacking press-fitting machine for fuel cell stacks. The press-fitting machine comprises a machine frame, a press-fitting device and a rotating device. The left end and the right end of the press-fitting device are rotatably installed at the left end and the right end of the machine frame, and the right end of the machine frame inclines upwards relative to theleft end of the machine frame; the press-fitting device comprises a clamp, a pressing plate and a driving mechanism, the left end of the clamp is fixedly arranged at the left end of the machine frame,the right end of the clamp is obliquely arranged upwards, the pressing plate is arranged at the right end of the machine frame, and the driving mechanism is in transmission connection with the pressing plate so as to drive the pressing plate to be close to or away from the stack on the clamp; a gas injection hole penetrating through the pressing plate is formed in the pressing plate, the gas injection hole corresponds to the gas inlet of the stack, and the pressing plate is provided with a plurality of pressure sensors; the rotating device enables the clamp to incline backwards. According tothe press-fitting machine, the stacking precision, the stacking quality and the yield are improved, the assembly quality is improved, the repair rate is reduced, assembly waste products are effectively avoided, the utilization rate of supplied materials is increased and the environment is protected.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a fuel cell stack horizontal stacking and pressing machine. Background technique [0002] The proton exchange membrane fuel cell is composed of multiple single cells stacked in series, fastened by internal positioning screws or clips. Composition of fuel cell stacks. When the stack is working, hydrogen and oxygen enter from the inlet respectively, and are distributed to the bipolar plates of each single cell through the main channel of the stack. When stacking, it is necessary to ensure that the plates are pressed against each other to prevent gas leakage, and ensure that the main gas channels of each plate are aligned so that hydrogen and oxygen can reach each single cell of the fuel cell smoothly. The stacking quality of the fuel cell is closely related to the performance of the battery product. If there is no good positioning device for each single cell during assembly, t...

AI Technical Summary

Problems solved by technology

If the alignment between the bipolar plate and the membrane electrode is not neat during the stacking process, there will be air leakage during the press-fitting process, which will eventually lead to invalid stacking and rework, and the possibility of damage to the bipolar plate and membrane electrode

In the entire stacking process, due to the excessive stacking quantity and the inherent error of the processing size, there may be a cumulative error, and there may be an offset misalignment.

After locking, the accumulative increase of uneven force in various places inside the stack

When the contact pressure in some areas inside the stack is too high, it is easy to deform the bipolar plate, and the proton exchange membrane fuel cell produced by it will also fail and damage; when the contact pressure in some areas inside the stack is too small, the bipolar plate and other components There will be gaps between them, and the seal of the fuel cell is not firm, which will cause hydrogen and oxygen to cross each other. In addition, the contact resistance between the membrane electrode and the bipolar plate will also increase sharply, and the internal resistance of the battery will increase, which will eventually affect the performance of the entire fuel cell.

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