Vehicle battery charging cooling system and method

Abstract

The present invention relates to a vehicle battery charging cooling system and method. The system includes a temperature detection unit which is configured to obtain ambient temperature and battery temperature during a battery charging process and obtain a battery temperature change rate according to the battery temperature; and a control unit for controlling on / off of a first cooling circuit and a second cooling circuit according to current ambient temperature and the battery temperature change rate; when in on state, the first cooling circuit can cool a battery on the basis of flow of a cooling liquid; when in on state, the second cooling circuit is configured to cool the cooling liquid in the first cooling circuit by an air-conditioning refrigerant of a vehicle, wherein the cooling condition is that the ambient temperature is greater than or equal to a set first temperature threshold, and the battery temperature change rate is greater than or equal to a set change rate. The vehicle battery charging cooling system can achieve different heat dissipation requirements during the vehicle battery charging process.

Description

technical field [0001] The invention relates to the field of vehicle technology, in particular to a system and method for charging and cooling a vehicle battery. Background technique [0002] The core problems faced by electric vehicles are insufficient mileage and insufficient configuration of charging settings. Fast charging piles can solve the problem of charging and cooling the batteries of electric vehicles. However, at different battery temperatures, the charging capacity and charging efficiency of the power battery vary greatly. The temperature of the fast charging battery rises rapidly in a high temperature environment. If the temperature rise of the battery cannot be effectively controlled, the battery’s allowable charging capacity will drop rapidly; if If the battery temperature cannot be effectively lowered, on the one hand, it is easy to cause the danger of charging the power battery. On the other hand, the charging efficiency of the battery decreases, and the ti...

AI Technical Summary

Problems solved by technology

However, at different battery temperatures, the charging capacity and charging efficiency of the power battery vary greatly. The temperature of the fast charging battery rises rapidly in a high temperature environment. If the temperature rise of the battery cannot be effectively controlled, the battery’s allowable charging capacity will drop rapidly; if The battery temperature cannot be effectively lowered. On the one hand, it is easy to cause the danger of charging the power battery. On the other hand, the charging efficiency of the battery decreases, and the time of fast charging is greatly prolonged, which affects the efficiency of fast charging.

[0003] To solve this problem, the traditional method is to blow the cold air from the air conditioner compressor into the battery pack for circulation to cool the battery. However, when the battery pack contains multiple batteries, this method has low cooling efficiency and poor battery cooling effect. The problem of uniformity and large temperature difference of multiple batteries

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