Electric vehicle, power battery system and heating control method thereof

Abstract

The invention proposes an electric vehicle, a power battery system and a heating control method of the power battery system. The power battery system comprises a power battery, a heating resistor, a battery heating positive contactor, a battery heating negative contactor, a charging socket, a charging positive contactor and a charging negative contactor. In the electric vehicle, the power batterysystem and the heating control method of the power battery system, the power battery is charged and heated by the battery heating positive contactor, the battery heating negative contactor, the charging positive contactor and the charging negative contactor, travelling heating and charging loop are optimized and integrated, the function of low-temperature charging and heating of the power batteryis achieved, the function of travelling and heating of the power battery is also compatible, the power battery is enabled to continuously work within an appropriate temperature zone, the maximum development of the power battery performance is satisfied, the power demand of the whole vehicle is satisfied, and the service lifetime of the power battery is prolonged; and meanwhile, charging heating and traveling heating share the four contactors, and the cost of the whole vehicle is reduced.

Description

technical field [0001] The invention relates to the technical field of automobiles, in particular to an electric vehicle, a power battery system and a heating control method thereof. Background technique [0002] As the energy storage station and energy station of electric vehicles, the power battery system is a vital part of the power system. The material properties of the power battery itself are closely related to the temperature, and the charge and discharge capabilities of the power battery are limited to a certain extent in low temperature environments. When the power battery is charged under low temperature conditions, it can only be charged with a very small current. If the temperature is too low, charging will be prohibited, causing the vehicle to fail to start; The rate of heat production, the temperature of the power battery will continue to drop, and its discharge capacity will be limited, which cannot meet the power demand of the vehicle and affect the power of...

AI Technical Summary

Problems solved by technology

The material properties of the power battery itself are closely related to the temperature, and the charge and discharge capabilities of the power battery are limited in low temperature environments.

When the power battery is charged under low temperature conditions, it can only be charged with a very small current. If the temperature is too low, charging will be prohibited, causing the vehicle to fail to start; The rate of heat production, the temperature of the power battery will continue to drop, and its discharge capacity will be limited, which cannot meet the power demand of the vehicle and affect the power of the vehicle; at the same time, if the battery continues to work at low temperature, a large amount of electric energy will be consumed in In terms of internal resistance and heat generation, the Coulomb efficiency decreases, the battery capacity cannot be released at the maximum power, and the cruising range is reduced

[0003] In the related art, charging preheating is usually used to solve the problem of power battery charging limitation under low temperature conditions, but the charging preheating solution in the related art usually uses too many contactors, which leads to an increase in the cost of the vehicle. At the same time, under low temperature conditions The discharge of the power battery is still limited to a certain extent, which cannot meet the power demand of the whole vehicle and affect the battery life

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