Fuel cell thermal management system with adjustable heat dissipating capacity and control method

Abstract

According to the fuel cell heat management system with the heat energy recovery function and the control method, heat generated by the fuel cell system is used for providing heat for other parts needing heat in a heat exchange mode of the heat exchanger and the heat storage system, and the heat of the fuel cell system is effectively utilized; a second three-way valve is added, the heat management system can control the flow flowing through the radiator by adjusting the working angle of the second three-way valve, and when the temperature is between the lower limit temperature and the upper limit temperature and the rotating speed of a fan of the radiator is reduced to 0, a control unit of the heat management system judges that the temperature value T2 is much lower than the temperature value T4, and it can be judged that the current radiator is in the windward state, and in the continuous heat dissipation process, in order to avoid excessive heat dissipation, the control unit controls the second three-way valve to conduct throttling on the radiator so as to avoid excessive heat dissipation.

Description

technical field [0001] The invention relates to the technical field of fuel cell systems, in particular to a fuel cell heat management system and control method with adjustable heat dissipation. Background technique [0002] A fuel cell system is a device that converts fuel (reductant) and oxygen (oxidant) electrochemically into electrical energy. The basic principle of the hydrogen fuel cell is 2H2+O2→2H2O+electrical energy+thermal energy. Under the continuous operation of the fuel cell, its thermal energy will continue to accumulate, causing the temperature of the entire system to rise. At this time, a thermal management system is required to manage the heat of the fuel cell system to ensure that the fuel cell can work at a suitable temperature. [0003] The existing technical scheme, the basic scheme is two temperature sampling points (T1 / T2), a water pump, a radiator, a heater, a water tank, and a three-way valve, wherein the temperature sampling point provides a thermal...

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Problems solved by technology

[0003] The existing technical scheme, the basic scheme is two temperature sampling points (T1 / T2), a water pump, a radiator, a heater, a water tank, and a three-way valve, wherein the temperature sampling point provides a thermal management control system State input, the water pump is used to adjust the flow of coolant, the heater is used to quickly increase the temperature of the heat management coolant, the radiator lowers the temperature of the coolant, the three-way valve adjusts the flow of the heater branch, and the water tank stores the coolant; however, the existing technology There are the following deficiencies: 1. The heat generated by the fuel cell system is dissipated to the external environment through the thermal management system, and the heat cannot be effectively used; If a lot of waste heat is not produced, the cooling fluid of the thermal management system will generate a certain amount of heat dissipation when it flows through the radiator. The amount of heat dissipation makes it difficult for the overall temperature of the fuel cell system to rise

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