Power battery heat-preservation control method and system for electric vehicle, and vehicle

Abstract

The invention provides a power battery heat-preservation control method and system for an electric vehicle, and the vehicle. The power battery heat-preservation control method comprises the steps thata vehicle-mounted communication module receives a charging setup instruction, wherein the charging setup instruction comprises the charging time and the vehicle-using time; according to the chargingtime, when charging is completed, a vehicle controller obtains the power battery heat-preservation preheating time according to the power battery average temperature, the environment temperature and the vehicle-using time; the vehicle-mounted communication module conducts timing, when the power battery heat-preservation preheating time is reached, a heat-preservation request is sent to the vehiclecontroller; the vehicle controller sends a heat-preservation instruction to a battery controller according to the heat-preservation request; and the battery controller controls a heater to heat a power battery according to the heat-preservation instruction. According to the power battery heat-preservation control method, the problems that under the cold winter low-temperature situation, vehicle power performance is limited, and the mileage is decreased can be solved, thus the service life of the power battery is prolonged, and the endurance mileage of the power battery is increased.

Description

technical field [0001] The invention relates to the technical field of automobiles, in particular to a power battery heat preservation control method, system and vehicle of an electric vehicle. Background technique [0002] The performance of the power battery on an electric vehicle is particularly affected by temperature, and the performance of the battery directly determines the performance of the vehicle. Under low temperature conditions, such as when the temperature is -20°C or below, the dynamic output power of the battery will be limited, and the low output power will affect the dynamic performance of the vehicle, resulting in the vehicle not being able to drive at high speed, the acceleration performance is limited, and the climbing performance is affected. influences. In addition, when the temperature is low, the available energy of the battery will decrease, which in turn will lead to a decrease in the driving range of the vehicle, causing range anxiety to customer...

AI Technical Summary

Problems solved by technology

[0004] Using a fixed heating and holding time cannot guarantee that the battery temperature is at an appropriate temperature when the user actually uses the car

For example, after the customer gets off work, the battery is charged at 8 in the evening, and it may be fully charged at 11 in the evening or at other times. Then the customer will use the car at 8:30 in the morning the next day. The heating and heat preservation ends early. In the cold winter, the temperature of the battery may have dropped before the user uses the car, which will still affect the performance of the battery.

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