Battery thermal management system and control method

Abstract

A battery thermal management system and a control method are disclosed, the battery box comprises a battery box body, a battery module is arranged in the battery box, the battery module is composed ofN x M battery monomers, a cold plate is arranged in the middle of the battery module, the cold plate is arranged on the battery monomer through an opening jacket, a liquid channel is uniformly arranged, a composite phase change material is arranged between adjacent battery monomers, a liquid inlet and a liquid outlet are arranged in the battery box, and the liquid inlet and the liquid outlet areconnected with the liquid channel; the external circulation device comprises an electric heater, a water pump, a heat exchanger, a cockpit evaporator, a compressor, a condenser, a first throttle valveand a second throttle valve. The invention has the advantages of compact overall structure, simplicity, stability, high efficiency and the like. The battery module can be cooled, insulated and heatedto make the battery work in the appropriate temperature range, and can be integrated into the vehicle thermal management system to improve the battery thermal management system of electric vehicles.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a battery thermal management system and a control method. Background technique [0002] As the core component of electric vehicles, the working performance of batteries is greatly affected by temperature. If the temperature is too high, it will affect the battery voltage, charge and discharge efficiency, and battery life; , There may even be phenomena such as liquid leakage, outgassing, and smoke. In severe cases, violent combustion and explosion may occur, which greatly reduces the reliability and safety of electric vehicles. [0003] At present, battery thermal management methods can be divided into three methods: air, liquid and phase change materials according to the heat transfer medium. The three methods have their own advantages and disadvantages, and it is difficult for a single method to meet all the heating, heat preservation and heat dissipation requirements. The air or liq...

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Problems solved by technology

The three methods have their own advantages and disadvantages, and a single method is difficult to meet all heating, heat preservation and heat dissipation requirements

The air or liquid medium method is mostly used in the market. The advantage of the air medium is its simple structure, but its heat dissipation and uniform temperature efficiency is low; the advantage of the liquid medium method is its high heat transfer capacity, but its disadvantages are its complex structure and high energy consumption.

The phase change material has the characteristics of constant temperature absorption / release heat. Using its latent heat of phase change can delay the temperature rise or fall of the battery, thereby playing the function of passive temperature control. The main problem of this method is that the ability to dissipate heat is low. After the phase change of the material is completed, if the heat cannot be dissipated in time, the battery will be exposed to an excessively high temperature environment

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