Cooling system for vehicle fuel cell system

Abstract

The invention discloses a cooling system for a vehicle fuel cell system, and the cooling system comprises a circulation pump; a temperature control valve which is provided with five openings corresponding to the five flow channels; a fuel cell control unit which is connected with the temperature control valve to control the opening degree of each opening of the temperature control valve, wherein the first flow channel is sequentially communicated with the circulating pump, a fuel cell stack and the first opening of the temperature control valve from the upstream, the second flow channel is sequentially communicated with the circulating pump, an intercooler and the second opening of the temperature control valve from the upstream, the third flow channel is sequentially communicated with thethird opening of the temperature control valve, a heater and the circulating pump from upstream, the fourth flow channel is sequentially communicated with the fourth opening of the temperature control valve, a radiator and the circulating pump from upstream, and the fifth flow channel serves as a radiator bypass and is sequentially communicated with the fifth opening of the temperature control valve and the circulating pump from the upstream. The fuel cell control unit controls the opening degrees of the plurality of openings of the temperature control valve according to different working conditions so as to selectively communicate with the plurality of flow channels to form cooling cycles corresponding to different working conditions. The cooling liquid flow under different working conditions can be accurately controlled.

Description

technical field [0001] The invention relates to the field of fuel cells, in particular to a cooling system for a vehicle fuel cell system. Background technique [0002] A fuel cell is a highly efficient energy conversion device that converts chemical energy stored in a fuel such as hydrogen into electrical energy and generates water. It does not produce any pollutants during operation and is one of the ideal sources of electric energy in the future. Its ideal conversion efficiency is 83%, and the current actual operating efficiency is 45~60%. [0003] A fuel cell system is composed of a fuel cell stack and its auxiliary systems. The fuel cell stack is assembled by stacking multiple monomers. The continuous operation of the fuel cell stack requires the solid polymer electrolyte membrane in the monomer to be kept at an appropriate humidity and humidity to provide a good working environment for the catalyst on the electrolyte membrane. , very active. If the temperature is t...

AI Technical Summary

Problems solved by technology

Because the traditional car thermostat is a mechanical structure, the paraffin in it melts at a certain temperature and has a certain time to completely melt, which delays the opening of the large cycle and causes a certain fluctuation in the coolant temperature; the electronic thermostat Although the device can control the melting time of the paraffin, it can heat the paraffin in advance, and speed up the opening speed of the large cycle to a certain extent, but in the process of opening, it cannot accurately control the flow rate of the large and small circulation of the cooling liquid, and cannot achieve higher cooling in the small cycle. Accurate control of the flow of lower temperature coolant in the liquid and large circulation channels, so that the temperature fluctuations during the large and small circulation cannot be controlled

Fluctuations in temperature have a great influence on the output characteristics of the fuel cell system, resulting in the degradation of stack life

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