Battery box heat management system and method for electric automobile

Abstract

The invention discloses a battery box heat management system for an electric automobile. The battery box heat management system comprises a battery management system, a polarity conversion switch, a battery module, semiconductor refrigeration sheets, a heat pipe, heat dissipation fins and temperature sensors, wherein the temperature sensors are attached to the battery module; the heat pipe is connected with the semiconductor refrigeration sheets and the heat dissipation fins; the battery management system is connected with the temperature sensors and is also connected with the polarity conversion switch; the polarity conversion switch is connected with the semiconductor refrigeration sheets; the battery management system controls turn-on and turn-off of the polarity conversion switch and the positive electrode and the negative electrode of the polarity conversion switch according to detected results of the temperature sensors. The invention also discloses a battery box heat management method for the electric automobile. The battery box heat management system can realize cooling and heating of the battery module and is simple in structure.

Description

technical field [0001] The invention relates to a heat exchange system, in particular to a heat management system and method for a battery box of an electric vehicle. Background technique [0002] The charge and discharge of electric vehicle batteries need to be within a certain temperature range. Too high or too low temperature will affect the charge and discharge of the battery, reduce the life of the battery, and reduce the mileage of the electric vehicle, thereby increasing the cost of the electric vehicle. , hinder the development and popularization of electric vehicles; in severe cases, the battery will also short-circuit, threatening the personal safety of the passengers. [0003] The existing thermal management methods of electric vehicle battery boxes mainly include air cooling, liquid cooling and the use of phase change materials. The air-cooling method has a simple structure, and only needs to install a fan at the air inlet and outlet of the battery box to achie...

AI Technical Summary

Problems solved by technology

The air-cooling method has a simple structure, and only needs to install a fan at the air inlet and outlet of the battery box, so as to achieve the purpose of heat dissipation by strengthening the air flow in the battery box, but the cooling effect of this cooling method is not good when the external environment temperature is high; The liquid cooling method needs to connect a heater and a refrigerator outside the battery box to heat and cool the liquid in the cooling circuit, but this method has strict requirements on the sealing of the liquid circuit and requires a complicated structure. Once the liquid in the circuit leaks , it is easy to cause a short circuit of the battery, which seriously threatens the safety of the passengers

The use of phase change materials does not require additional equipment, and the structure is simple, but the heat dissipation effect is not ideal when the car works continuously for a long time, and the battery module cannot be preheated when the car is started when the outside temperature is very low

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