Fuel cell control system and fuel cell system cold start-up control method

Abstract

The invention discloses a fuel cell control system and a fuel cell system cold start-up control method. The fuel cell control system comprises a fuel cell electric pile, an internal auxiliary cooling circuit, an external main cooling circuit and a water pump motor controller; the internal auxiliary cooling circuit comprises a first cooling water pump and a first valve, and the external main cooling circuit comprises a second cooling water pump, a second valve and a radiator. Compared with prior art, the fuel cell cold start-up method can effectively avoid the damage of the started fuel cell electric pile on the battery under low temperature state, normal work of the fuel battery can be ensured, and fuel cell life is prolonged. Simultaneously, the external heating equipment is not required when the internal auxiliary cooling circuit is added, and the cold start-up cost is reduced.

Description

technical field [0001] The invention relates to the battery field, and specifically designs a fuel cell control system and a fuel cell system cold start control method. Background technique [0002] Fuel cell is a new type of power generation device with high efficiency and environmental protection, and it is widely used in various fields. According to the working principle of proton exchange membrane fuel cell (PEMFC), the cathode catalytic layer of the battery is not only the place where the electrochemical reaction of the battery is carried out, but also the place where the reaction product water is produced. When the proton exchange membrane fuel cell works at normal temperature, there are reaction gas humidification water and reaction product water in the cell, and the product water of the cathode catalytic layer diffuses to the cathode diffusion layer in gaseous or liquid form and then enters the cathode gas flow channel, from the battery through The airflow carries i...

AI Technical Summary

Problems solved by technology

[0003] (1) The ice formed on the catalytic layer will cover the active surface, reducing or preventing the reaction gas from reaching the reaction interface. After the active area is completely covered, the battery will not start.

[0004] (2) Humidification water will block the flow channel and prevent the transmission of reaction gas

[0005] (3) The ice crystals formed on the catalytic layer will damage the structure of the polymer membrane, causing the membrane to bulge, rupture, and perforate

[0006] (4) When water freezes, it will produce 9% volume expansion, and harmful pressure will be applied inside the battery, which may damage the internal structure of the battery. When the waste heat generated after the battery starts to melt the ice into water, the volume will decrease again. The volume change caused by the freezing / thawing process will have a cumulative effect on the battery material

[0007] Existing fuel cell cold start methods often add external heating equipment to warm the fuel cell in a cold state, which increases the cost of the fuel cell

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