Vehicle fuel cell thermal management system and method

Abstract

The invention discloses a vehicle fuel cell thermal management system and method. The thermal management system includes a water-cooling main loop disposed between a fuel cell module and an ATS assembly, the water-cooling main loop includes a first main loop and a second main loop, a first branch and a second branch in parallel arrangement are disposed between the first main loop and the second main loop, the first branch is equipped with a heater, a passenger compartment warm air heating loop is accessed to the second branch, the pipeline of the first main loop between the second branch and the ATS assembly is equipped with a first electromagnetic valve, the first branch is equipped with a second electromagnetic valve, and the second branch is equipped with a third electromagnetic valve,the pipeline of the second main loop between the first branch and the fuel cell module is equipped with a water pump, the water-cooling main loop is equipped with a temperature sensor, the signal output end of the temperature sensor is connected to a vehicle control unit, the signal output end of the vehicle control unit is connected to the first electromagnetic valve, the second electromagnetic valve, the third electromagnetic valve, the heater and a passenger compartment warm air blower. The system and method provided by the invention can shorten the fuel cell starting time, and make full use of the heat generated by fuel cells.

Description

technical field [0001] The invention relates to the technical field of electric vehicles, in particular to a fuel cell thermal management system and method for vehicles. Background technique [0002] Fuel cell bus is a new technology bus using hydrogen as energy. It has been widely valued by the world due to its advantages of energy saving, zero emission, no pollution, high efficiency, low noise and high reliability. The typical operating temperature range of the fuel cell, the power source, is 60°C to 80°C. If the temperature is too high or too low, the fuel cell will fail. Therefore, thermal management has become a bottleneck restricting the development of fuel cells. [0003] Thermal management plays a vital role in the stable operation and service life of fuel cells: [0004] (1) The fuel cell itself needs to reach a certain temperature before it can start normally, so when the external ambient temperature is too low, the coolant of the fuel cell needs to be heated to ...

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Problems solved by technology

[0005] (2) Nearly 50% of waste heat is generated when the fuel cell is working. If it is not removed in time, the internal temperature of the fuel cell will be too high (over 90°C), which will dehydrate the proton exchange membrane, reduce the conductivity, and deteriorate the battery performance; if the temperature is too high When the temperature is low (below 60°C), the polarization of the fuel cell will increase, the impedance will increase, and the battery performance will also deteriorate

In the practical application of fuel cells, many have encountered problems such as low energy utilization and fuel cell failure due to unsatisfactory thermal management.

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