Method and device for estimating residual charging time of power battery and electric vehicle

Abstract

The invention provides a method and a device for estimating residual charging time of a power battery and an electric vehicle. The method comprises the following steps of: determining a current target charging order of the power battery based on a battery cell monomer voltage collected when the power battery is charged; judging whether the power battery starts a preheating function or not; if the preheating function of the power battery is not started, determining the residual charging time required by the power battery at the target charging order; for each remaining charging order after the target charging order, repeatedly executing the following steps: calculating the highest battery temperature and the lowest battery temperature corresponding to the next charging order; based on the calculated battery maximum temperature and battery minimum temperature corresponding to the next charging order and the next charging order, determining the remaining charging time required by the power battery at the next charging order; and determining the sum of the remaining charging time required by the power battery at the target charging order and each subsequent charging order as the first total remaining charging time of the power battery without starting the preheating function.

Description

technical field [0001] The invention belongs to the field of battery management systems for new energy vehicles, and in particular relates to a method and device for estimating the remaining charging time of a power battery and an electric vehicle. Background technique [0002] With the gradual deterioration of the global climate, the increase of urban air pollution and the excessive consumption of oil resources, more and more people in the automotive field are turning their attention to electric vehicles. The charging time of electric vehicle power battery and estimation of remaining charging time are very important to user experience. [0003] Accurately estimating the remaining charging time can provide users with appropriate guidance for using the car. Users can make reasonable arrangements for using the car based on the estimated remaining charging time and their own conditions, reducing unnecessary waiting and improving user experience. In addition, the accurate estim...

AI Technical Summary

Problems solved by technology

[0005] 1. Calculate the remaining time according to the real-time current, and the estimated value will jump with the current fluctuation;

[0006] 2. The charging current is calculated according to the real-time battery temperature during charging, and the temperature change during the entire charging process is not considered, resulting in a large error in the estimated value of the remaining charging time

[0007] Based on the lack of accuracy of the existing power battery remaining charging time estimation method and the poor user experience, it is particularly important to optimize the remaining charging time estimation method

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