Fuel cell hybrid power supply system suitable for cold start and modeling method thereof

Abstract

The invention relates to a fuel cell hybrid power supply system suitable for cold start and a modeling method thereof. The system is additionally provided with a channel allowing cathode air to reachan anode, a channel bypassing an air cooler and a humidifier, and a heating resistor. According to the modeling method, a gas supply subsystem model, a cooling subsystem model, a storage battery low-temperature model, a fuel cell monomer model and a fuel cell stack model are separately established; and the phenomena of water generation, phase change, ice accumulation, transfer and the like in thelow-temperature starting process of a fuel cell are taken into consideration in the fuel cell monomer model, so the accuracy of the model is guaranteed . Compared with the prior art, all the parts inthe fuel cell are modeled respectively, and mass and heat transfer among all the layers is solved, so temperature distribution difference among all the layers of the cell can be reflected, the outputperformance of the fuel cell in the low-temperature starting process can be better predicted, and the accuracy and application value of the model are improved.

Description

technical field [0001] The invention relates to the field of electrochemical fuel cells, in particular to a fuel cell hybrid power system adapted to cold start and a modeling method thereof. Background technique [0002] The key factor for the success of a fuel cell cold start is the dynamic ratio of the temperature rise rate of the battery itself to the ice accumulation rate. At present, the mainstream cold start strategies mainly include methods such as heat preservation, shutdown and purging, auxiliary heating, and self-starting. Shutdown and purging can reduce the accumulation of ice inside the battery before the fuel cell is started, which is an essential part of cold start. Auxiliary heating And self-starting use a large amount of heat input to make the fuel cell heat up quickly. The difference is that auxiliary heating uses the battery and heating resistors to heat the stack, and self-starting uses the chemical reaction of the fuel cell itself to generate heat to incr...

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Problems solved by technology

Moreover, most of the current one-dimensional models are simplified based on the three-dimensional finite element simulation model, and the simulation environment of the model is mostly finite element simulation software, which can only simply analyze the influence of different working parameters and battery structure parameters on the cold start performance based on the model, which is difficult to use for fuel The optimization of the battery cold start control strategy, in order to make the established simulation model can be used to solve more cold start problems, it is more meaningful to establish a one-dimensional layered simulation model in the MATLAB / SIMULINK environment

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