A sealing structure suitable for thin bipolar plate with position limiting function

Abstract

The invention relates to a thin bipolar plate sealing structure with a limiting function. The thin bipolar plate sealing structure comprises thin bipolar plates, membrane electrode frames and sealing glue lines; the thin bipolar plates are provided with sealing grooves, and the bottoms of the sealing grooves are flat surfaces; two sides of each sealing groove are convex inner and outer edges; the sealing glue lines are arranged in the sealing grooves and extend out of the outer edges of the sealing grooves; the end parts of the sealing glue lines are flush with the outer edges of the thin bipolar plates and the membrane electrode frames; the sealing glue lines are provided with grooves in the positions which correspond to the outer edges of the sealing grooves, and the grooves of the sealing glue lines are matched with the outer edges of the sealing grooves of the thin bipolar plates; and the contact surfaces of the sealing glue lines and the membrane electrode frames are flat surfaces. Because the sealing glue lines and the sealing grooves are used for limiting mutually, the leakproofness of electrical piles can be kept stable and reliable, and the performance of multiple sections of electrical piles can be kept consistent; the sealing glue lines are convenient to arrange, can be operated efficiently and have buffering and damping functions; the contact surfaces of the sealing glue lines and the membrane electrode frames are flat surfaces, thus the membrane electrode frames are not easy to deform, and the physical structure of a membrane electrode can be prevented from being damaged; and the sealing glue lines can be manufactured from a variety of materials, and the materials for manufacturing the sealing glue lines are readily available and can be selected according to needs.

Description

technical field [0001] The invention relates to the field of proton exchange membrane fuel cells, in particular to a thin bipolar plate sealing structure for 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 glue wire, resulting in relativ...

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 shearing will cause the physical structure of the membrane electrode to fail; the bonding force or friction between the sealing plate and the plate is not enough during surface sealing, and the sealing reliability is difficult to guarantee; at the same time, the various sealing functions of the prior art are single, which affects reliability , Other engineering requirements of the product are poorly integrated

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