High-reliability thin bipolar plate sealing structure

Abstract

The invention relates to a high-reliability thin bipolar plate sealing structure. Bulges are uniformly distributed on the sealing areas of a thin bipolar plates; sealing sheets are pressed and positioned by the bulges; the outer edges of two sides of the sealing sheets are large than the outer edges of two sides of the thin bipolar plates; the two sealing sheets are respectively provided with sealing sheet bulges and sealing sheet grooves in the positions which correspond to the outer edges of two sides of the thin bipolar plates; the sealing sheet bulges are arranged in the sealing sheet grooves; and the two sealing sheets are combined together through the sealing sheet bulges and the sealing sheet grooves. The high-reliability thin bipolar plate sealing structure provided by the invention is reliable and effective; effective limiting grooves are formed between each section of the thin bipolar plates, single battery can be prevented from being over-pressed, and electric piles can be kept consistent; the frame of a membrane electrode can be protected against deformation, and the physical structure of the membrane electrode can be prevented from being damaged; the sealing sheets can be positioned and arranged conveniently and can be operated efficiently; the sealing sheets can be manufactured from a variety of materials; the outer edges of the sealing sheets protrude out of the outer sides of the electric piles, thus the sealing sheets can prevent the short circuit of the thin metal bipolar plates and guarantee the insulativity of the electric piles; and the sealing sheets have buffering and damping functions and can improve the reliability of the thin bipolar plates applied to the engineering.

Description

technical field [0001] The invention belongs to the field of proton exchange membrane fuel cells, in particular to a sealing structure between thin bipolar plates and membrane electrodes of proton exchange membrane fuel cells. Background technique [0002] In the prior art, the sealing between the fuel cell thin bipolar plate and the membrane electrode is mainly realized by glue line sealing, including line sealing and surface sealing. Wire sealing is to place the glue line in the sealing groove. In order to prevent the glue line from overflowing or dislocation, glue bonding is usually used (stick the glue line to the sealing groove of the thin bipolar plate, or to the membrane electrode frame, or both or both) or reserve space for the glue line to overflow along the line of the glue line groove; the surface seal is to seal the sealing area of ​​the thin bipolar plate with a sealing sheet. The disadvantages of the prior art are: the wire seal uses adhesive force to bind the...

AI Technical Summary

Problems solved by technology

The disadvantages of the prior art are: the wire seal uses adhesive force to bind the glue wire, resulting in relatively concentrated stress, resulting in the deformation of the membrane electrode frame, which in turn causes the physical structure of the membrane electrode to fail; Higher, the actual sealing effect is difficult to guarantee; reserved space type line seal when the glue line overflows into the reserved space, the glue line will be misplaced on both sides of the membrane electrode, resulting in a decrease in the sealing ability at this place, and it will also damage the membrane electrode frame. The formation of shear leads to the failure of the physical structure of the membrane electrode; the bonding force or friction between the sealing sheet and the electrode plate is not enough when the surface is sealed, and the sealing reliability is difficult to guarantee

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