Residual heat utilization system of fuel cell and control method

Abstract

The invention provides a residual heat utilization system of a fuel cell and a control method. The residual heat utilization system of the fuel cell comprises a controller, a first pipeline, a first temperature sensor, a water pump, a first three-way valve, a second three-way valve, a second pipeline, a third three-way valve, a third pipeline, a second temperature sensor, a fourth three-way valve, a fourth pipeline, a heat sink and a warm wind collection device, wherein a first end of the first pipeline is connected with an electric stack of the fuel cell, the first temperature sensor and the water pump are arranged on the first pipeline, the second temperature sensor is arranged on the third pipeline, a first end of the fourth three-way valve is connected with the electric stack of the fuel cell by the fifth pipeline, the heat sink is arranged on the fourth pipeline, and the warm wind collection device comprises an electric heater PTC (Positive Temperature Coefficient) group and a heat exchanger arranged on the third pipeline. With the residual heat utilization system of the fuel cell and the control method, provided by the embodiment of the invention, the working temperature of the electric stack of the fuel cell is ensured, residual heat generated by reaction of the electric stack of the fuel cell is effectively used for warm wind heat supply in a compartment, and the residual heat utilization system is energy-saving and environmental-friendly, is simple in structure and low in limitation of a applicable region.

Description

technical field [0001] The invention relates to the technical field of electric vehicle design, in particular to a fuel cell waste heat utilization system and a control method. Background technique [0002] The fuel cell stack of an electric vehicle generates a large amount of heat energy during operation, but the existing electric vehicles rarely use this part of heat energy, and basically use coolant to take away excess heat energy to maintain the working temperature of the fuel cell stack. This system cannot re-use the heat dissipated by the fuel cell stack, it can only be wasted. In addition, the heat of the fuel cell stack is controlled only by the flow of coolant, which is limited by the capacity of the water pump. If the speed of the water pump is not high enough, the water flow will be limited, which may lead to the risk of the system temperature exceeding the range. Contents of the invention [0003] The technical problem to be solved by the embodiments of the pr...

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Problems solved by technology

[0002] The fuel cell stack of an electric vehicle will generate a lot of heat energy when it is working, but the existing electric vehicles make less use of this part of the heat energy, and basically use coolant to take away the excess heat energy to maintain the working temperature of the fuel cell stack

This system cannot re-use the heat dissipated by the fuel cell stack and can only be wasted

In addition, the heat of the fuel cell stack is controlled only by the flow of coolant, which is limited by the capacity of the water pump. If the speed of the water pump cannot be high enough, the water flow will be limited, which may cause the risk of the system temperature exceeding the range.

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