Manufacturing technology of bipolar plate

Abstract

The invention discloses a manufacturing technology of a bipolar plate. The manufacturing technology comprises the following steps: (1) selecting and using enough polyethylene paraffin, putting the polyethylene paraffin into a container, and heating until the polyethylene paraffin is completely fused; (2) immersing a graphite plate into the fused polyethylene paraffin, and taking out the immersed graphite plate until no bubble is emitted; and (3) hemming the graphite plate through paraffin immersing treatment to guarantee no weeping inside, and then connecting the hemmed graphite plate with theshell of a battery through PVC glue, wherein two sides of the graphite plate through paraffin immersing treatment are both connected with graphite felts as a positive electrode and a negative electrode of the battery; and (4) then after sealing, forming serially connected connecting points of the positive electrodes and the negative electrodes of two batteries on the graphite plate, namely the bipolar plate. According to the manufacturing technology, the polyethylene paraffin material is selected and used as a filler of the graphite plate, on one hand, the permeation problem of the graphite plate is solved, and on the other hand, the electrical conductivity of the graphite plate in a zinc-iodine battery is met; the bipolar plate with small volume and good electrical conductivity is formed; and the problem of filler fusion caused by the fat that the zinc-iodine battery is heated in the using process is also solved.

Description

technical field [0001] The invention relates to a manufacturing process of a bipolar plate, which belongs to the field of material science and engineering. Background technique [0002] Since the output voltage of the unit cells of zinc-bromine batteries or zinc-iodine batteries is only 1.8V or 1.3V, it is necessary to connect multiple batteries in series to reach the rated voltage required by the device. In order to improve the spatial integration of the system, the best way is of course to directly manufacture multiple batteries together, so that the positive electrode of the previous stage is the negative electrode of the subsequent stage (or vice versa), so there must be such a material to play this role, This is called a bipolar plate, which is both one pole (such as the positive pole) of the previous battery and the other pole (such as the negative pole) of the subsequent battery. Obviously, it has to conduct electricity. At the same time, since both zinc-bromine bat...

AI Technical Summary

Problems solved by technology

At the same time, since both zinc-bromine batteries and zinc-iodine batteries are chemical batteries, general metals will be corroded, and gold, platinum, etc. are precious metals, and the cost is too high. Generally, it is unlikely to be used as bipolar plate materials. , then, what about our common graphite materials such as graphite plates? From the perspective of conductivity, graphite material is a very good plate material, and usually does not chemically react with the electrolyte. Van der Waals force between layers) determines that it must be a porous material, causing the electrolyte to penetrate through the graphite plate to the other side, thereby causing damage to the battery