Abstract: Provided are a cathode catalyst layer and a preparation method and use thereof, and a fuel cell. The method includes: mixing a catalyst, water, and an alcohol with a pore-forming agent to obtain a mixture; dispersing the mixture into a Nafion solution to obtain a slurry; and coating the slurry onto a surface of a diffusion layer to obtain a coated diffusion layer, and subjecting the coated diffusion layer to calcination and freeze-drying in sequence to obtain the cathode catalyst layer.

Abstract: A pulse hydrogen supply system for a proton exchange membrane fuel cell is provided. The system comprises a fuel cell, a high-pressure hydrogen bottle, a first pressure relief valve, an ejector, a steam-water separator, a first pressure control valve, a first pressure sensor, a high-pressure vessel, a first electromagnetic valve, a low-pressure vessel, a diaphragm pump, and a second electromagnetic valve. The high-pressure hydrogen bottle, the first pressure relief valve, the first pressure control valve, the ejector and the first pressure sensor are sequentially arranged on a gas inlet pipeline; the high-pressure vessel and the first electromagnetic valve are sequentially arranged on a branch pipeline; the second electromagnetic valve, the low-pressure vessel and the diaphragm pump are sequentially arranged on a first output loop; and the first output pipeline and the gas inlet pipeline form a loop.

Abstract: The present disclosure provides a fuel cell bipolar plate and a preparation method. The method includes: synchronously performing cathode flow field pre-rolling and anode flow field pre-rolling on both surfaces of a pair of flexible graphite coils; synchronously performing cathode flow field secondary rolling and anode flow field secondary rolling on both surfaces of the pre-rolled flexible graphite coils; cutting oxidant inlets/outlets, fuel inlets/outlets, and coolant inlets/outlets in the flexible graphite coils after secondary rolling, and cutting the flexible graphite coils into a bipolar plate shape to obtain a cathode plate and an anode plate; performing resin impregnating, cleaning, and curing on the cathode plate and the anode plate; oppositely arranging and bonding the cathode plate and the anode plate to form a fuel cell bipolar plate; synchronously fitting a cathode stiffener and an anode stiffener to obtain a finished fuel cell bipolar plate.

Abstract: A temperature control method for a vehicular proton exchange membrane fuel cell system comprises the following steps: detecting a cooling loop inlet temperature of a fuel cell stack by using a temperature sensor, and inputting the temperature into a controller to achieve cooling fan control based on the controller, wherein the cooling fan control comprises fuzzy logic self-adaptive proportional integral control and feedforward compensation control, gain parameters of the proportional integral control are self-adaptively updated by a fuzzy logic algorithm, a load current of the fuel cell serves as disturbance and is used for feedforward compensation, and meanwhile, the opening degree of the fan is determined by the total cooling capacity requirement and the number of cooling fans; and finally, inputting a control signal output by the controller into an actuator of a thermal management subsystem, and conducting cooling inlet temperature control of the fuel cell stack.

Abstract: A pulse hydrogen supply system for a proton exchange membrane fuel cell is provided. The system comprises a fuel cell, a high-pressure hydrogen bottle, a first pressure relief valve, an ejector, a steam-water separator, a first pressure control valve, a first pressure sensor, a high-pressure vessel, a first electromagnetic valve, a low-pressure vessel, a diaphragm pump, and a second electromagnetic valve. The high-pressure hydrogen bottle, the first pressure relief valve, the first pressure control valve, the ejector and the first pressure sensor are sequentially arranged on a gas inlet pipeline; the high-pressure vessel and the first electromagnetic valve are sequentially arranged on a branch pipeline; the second electromagnetic valve, the low-pressure vessel and the diaphragm pump are sequentially arranged on a first output loop; and the first output pipeline and the gas inlet pipeline form a loop.

Abstract: A temperature control method for a vehicular proton exchange membrane fuel cell system comprises the following steps: detecting a cooling loop inlet temperature of a fuel cell stack by using a temperature sensor, and inputting the temperature into a controller to achieve cooling fan control based on the controller, wherein the cooling fan control comprises fuzzy logic self-adaptive proportional integral control and feedforward compensation control, gain parameters of the proportional integral control are self-adaptively updated by a fuzzy logic algorithm, a load current of the fuel cell serves as disturbance and is used for feedforward compensation, and meanwhile, the opening degree of the fan is determined by the total cooling capacity requirement and the number of cooling fans; and finally, inputting a control signal output by the controller into an actuator of a thermal management subsystem, and conducting cooling inlet temperature control of the fuel cell stack.