According to “China‘s Energy-saving and New Energy Vehicle Technology Roadmap 2.0”, fuel cells in China are currently in the introduction stage of large-scale industrialization. There are many technical problems that need to be solved before industrialization. One of the key components is the fuel cell stack, which accounts for about 40% of the cost of a vehicle. According to the national plan, new energy vehicles will become the mainstream by 2035, accounting for more than 50% of the total sales, and the number of hydrogen fuel cell vehicles will reach about 1 million. Bipolar plates (or BPP), as the “Key component" of the Electric pile, usually have 300-500 bipolar plates in a electric pile. The cost of bipolar plate accounts for about 20-40% of the stack.

As the "heart" of hydrogen fuel cell vehicle, the long-term stability and service life of the electric pile are very important. If the hydrogen fuel cell is failure in sealing functional, it will lead to hydrogen leakage, reduce the utilization rate of hydrogen, affect the efficiency of the fuel cell, and in serious cases, the battery will not work, thus affecting the battery life.

Hydrogen fuel cell sealants are mainly used between bipolar plates and membrane electrodes, and between plates and plates. It requires the following features:

· High air tightness: in order to seal hydrogen and oxygen, especially hydrogen, as a colorless, odorless, flammable and explosive small molecular gas, even a small gap, hydrogen is very easy to lead to leakage;

· Rubber elasticity: the car is often in various states of motion, with elasticity is to absorb vibration and resist impact.

· Rubber material: Liquid silicone rubber / Solid silicone rubber/ Traditional rubber

· Product description: Metal bipolar / Graphite bipolar

· Technical key point: After the sealing gasket is produced, the sealing gasket and the bipolar plate are bonded and cured by using the cold glue process.