Double-temperature control system and method for passenger compartment and power battery of fuel cell vehicle

Abstract

The invention discloses a double-temperature control system for a passenger compartment and a power battery of a fuel cell vehicle. An output end of an electric compressor is connected to a port A ofa four-way reversing valve; a port B, a forecabin heat exchange module, a one-way valve parallel connection section, a refrigerant parallel connection section and a port C of the four-way reversing valve are sequentially connected in series; a port D of the four-way reversing valve, a gas-liquid separator and an input end of the electric compressor are sequentially connected in series; the refrigerant parallel connection section comprises a first refrigerant branch and a second refrigerant branch which are arranged in parallel, a cooling liquid outlet of a battery heat exchanger is connected to a cooling liquid inlet of a power battery system, and a cooling liquid outlet of the power battery system, an expansion water tank, a water pump and a cooling liquid inlet of the battery heat exchanger are sequentially connected in series. On the premise that the system is simplified, independent control over the passenger compartment temperature and the power battery temperature is achieved, abattery pack temperature and the battery cooling inlet temperature are adopted as power battery temperature adjusting parameters, the influence of thermal delay is avoided, and the temperature controlprecision of the power battery is improved.

Description

technical field [0001] The invention relates to the field of temperature control of a fuel cell vehicle, in particular to a dual temperature control system and method for a passenger compartment and a power battery of a fuel cell vehicle. Background technique [0002] Fuel cell vehicles have the advantages of energy saving, pollution-free, high efficiency and low noise. This type of vehicle not only uses fuel cells as the main power source, but also uses power batteries as its important auxiliary power source. The power battery needs to be equipped with a temperature control device to ensure its normal working temperature, so that it will not be overheated and damaged in high temperature in summer, and will not be degraded due to low temperature in cold winter. In addition, the automotive heat pump system also needs to cool in summer and heat in winter, so as to regulate the temperature of the passenger compartment and meet the comfort needs of passengers. In order to ensu...

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Problems solved by technology

[0004] However, there are two deficiencies in this prior art: first, the temperature requirements of the passenger compartment and the battery are different, and this prior art only uses a single expansion valve, which cannot meet the different evaporation temperature requirements of the two branches at the same time; second, because the system There is a certain delay in heat transfer, and it is easy to cause misjudgment and frequent start and stop of the cooling water pump to adjust the compressor and water pump based on the temperature in the power battery

Temperature control without power battery and passenger compartment

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