Method for acquiring dynamic maximum allowable charging/discharging current of lithium ion battery used for electric automobile

Abstract

The invention relates to a method for acquiring dynamic maximum allowable charging discharging current of a lithium ion battery used for an electric automobile. The method comprises the following steps: a, acquiring maximum allowable charging time data at different battery charging current intervals; b, acquiring maximum allowable discharging time data at different discharging current intervals; c, timing continuous charging time at a charging current interval which contains a real-time charging current; d, timing continuous discharging time at a discharging current interval which contains a real-time discharging current; e, setting maximum allowable charging current of the battery and maximum variation amplitude of the maximum allowable discharging current; and f, acquiring the current maximum allowable charging current and the current maximum allowable discharging current. In the invention, dynamic continuous adjusting on the maximum allowable charging discharging current is realized, and vehicle dithering caused by sudden change of power performance of a vehicle can be prevented, thus charging current and discharging current of the battery are controlled more accurately, and relation between the power performance and long service life of the battery can be better balanced.

Description

technical field [0001] The invention relates to the improvement of the management technical scheme of the lithium-ion battery of an electric vehicle. Background technique [0002] Electric vehicles are the future of the automobile industry. Under the joint promotion of the government and automobile manufacturers, they have developed rapidly. However, the problems of insufficient power and short life of the battery system seriously restrict the development of electric vehicles. Now the maximum allowable charge and discharge current of the battery is set to a limit value. During the use of the vehicle, the actual charge and discharge current of the battery is controlled by the management system of the electric vehicle to not exceed the limit value. However, due to the obvious time-varying and hysteresis of the internal resistance of the battery, the maximum allowable charge and discharge current changes with time, but the existing maximum allowable charge and discharge current...

AI Technical Summary

Problems solved by technology

However, due to the obvious time-varying and hysteresis of the internal resistance of the battery, the maximum allowable charge and discharge current changes with time, but the existing maximum allowable charge and discharge current is a definite value, without considering the duration of the problem, so when When the charging and discharging current of the battery lasts for a long time near the limit value, it will affect the life of the battery

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