Fuel cell bipolar plate with interrupt structure

Abstract

The invention relates to a fuel cell bipolar plate with an interrupt structure. An air interrupt structure, a hydrogen interrupt structure and a cooling water interrupt structure are respectively arranged on a negative pole plate and a positive pole plate of the bipolar plate, the air interrupt structure comprises a boss arranged at an edge runner groove and a boss arranged on an isolation region,the hydrogen interrupt structure comprises a boss arranged at an edge runner groove of the positive pole plate and a boss arranged on the isolation region, and the cooling water interrupt structure comprises a boss which is formed from grooves in the isolation regions of the negative pole plate and the positive pole plate in a cooling water cavity, a boss which is formed from grooves in runner ridges of the negative pole plate and the positive pole plate in the cooling water cavity and a boss which is formed from grooves in the isolation regions of the negative pole plate and the positive pole plate in the cooling water cavity. The bipolar plate has the advantages that no battery part is additionally arranged, the structure is easy to implement, the bypass flowing of air, hydrogen and cooling water can be effectively reduced, and the durability and the stability of the fuel cell are improved.

Description

technical field [0001] The invention relates to the field of fuel cells, in particular to a proton exchange membrane fuel cell bipolar plate, in particular to a bipolar plate anti-bypass flow structure. Background technique [0002] The cathode flow field and the anode flow field of the fuel cell bipolar plate guide and distribute hydrogen and air to the active area for electrochemical reaction, and at the same time guide and distribute cooling water to circulate inside and outside the battery. Ideally, the hydrogen and air entering the battery , Cooling water only circulates within the active area of ​​the bipolar plate. However, in addition to the active area on the bipolar plate, there are also a sealing area and an isolation area. The sealing area is used to ensure that the fluid does not leak, and the isolation area is used to isolate the active area and the sealing area. Electrochemical reactions will not occur in the isolation area. In the bipolar plates of the prior...

AI Technical Summary

Problems solved by technology

The disadvantage is that although the bypass flow of reactants can be improved, since the MEA sealing frame is bent at the nested protrusion, the tangential stress of the MEA sealing frame at the bend is relatively large, which can easily cause the membrane in the middle of the MEA to be damaged. , so that the battery fails; on the other hand, the patented technology does not provide measures to prevent the cooling water bypass circulation

Its disadvantage is that although the bypass flow of reactants can be significantly improved, the thickness of the increased filling material is not easy to control. If the thickness is too large, the contact pressure between the pole plate and the MEA will decrease, which will lead to an increase in the internal resistance of the battery. large; on the other hand, the patent does not give measures to prevent the bypass flow of cooling water

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