Heat preservation system and method for batteries of electric vehicle

Abstract

The invention provides a heat preservation system and method for batteries of an electric vehicle, belongs to the technical field of electric vehicles and aims at solving the problem that the serviceperformance is affected due to a slow heating rate on the batteries in the prior art. The heat preservation system for the batteries of the electric vehicle comprises a battery heating and heat preservation circulation line, a range extender circulation line and a temperature controller, wherein the battery heating and heat preservation circulation line is formed by connecting a motor circulationline and a battery circulation line through a control valve; the range extender circulation line comprises a first electronic water pump, a heater and a range extender; the battery circulation line isprovided with a temperature sensor; and the range extender circulation line is connected with the motor circulation line through a heat exchanger. The heat preservation method comprises the step as follows: the temperature controller controls the range extender and the heater to simultaneously work according to the temperature, monitored by the temperature sensor, of a battery pack, so that the battery pack is subjected to heating and heat preservation to normal working temperature through the battery heating and heat preservation circulation line or the battery circulation line. According tothe heat preservation system and method, the service performance of the batteries can be improved in a low temperature environment.

Description

technical field [0001] The invention belongs to the technical field of electric vehicles, and relates to an electric vehicle battery heat preservation system and a method thereof. Background technique [0002] At present, with the continuous tightening of national fuel consumption and emission regulations, more and more OEMs are devoting themselves to the development of electric vehicles. For pure electric vehicles, batteries will have low charge and discharge efficiency in low temperature environments, which will greatly affect The mileage and life of the battery are issues, so thermal management is required to solve the problem of battery insulation in a low-temperature environment, so that the battery can maintain its normal operating temperature between 10°C and 25°C. The current mainstream solution is to use PTC heating, but this solution first needs to consume battery power. When the car is cold-started in a low-temperature environment, the battery cannot provide enoug...

AI Technical Summary

Problems solved by technology

Although this invention can make the power battery always work in the optimal temperature environment, but this invention only uses the heat energy generated by the fuel engine to heat the power battery, which has the problem of slow heating speed and affects the performance of electric vehicles

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