Method for fast simulation of power battery aging process based on battery dynamic aging model

Abstract

The invention discloses a method for quickly simulating the aging process of a power battery based on a dynamic aging model of a battery. The battery aging is described as two processes of calendar aging and cycle aging, and the calendar aging model and cycle aging model of the battery are respectively established. The model takes the working current of the power battery and the ambient temperature as input, and outputs the attenuation value of the power battery capacity; finally, taking the size of the working current of the battery as the conversion condition, the two models are unified into the dynamic aging model of the battery, and in the computer environment The dynamic aging model of the battery is built. Based on the model, the capacity decay value of the power battery under different operating currents and ambient temperatures can be calculated, and the aging process of the power battery under different working environments and vehicle conditions can be quickly simulated. The invention can calculate the capacity attenuation value of the power battery under different working currents and ambient temperatures, and quickly simulates the aging process of the power battery under different working environments and vehicle working conditions.

Description

technical field [0001] The invention belongs to the technical field of power batteries, and in particular relates to a method for rapidly simulating the aging process of a power battery based on a battery dynamic aging model. Background technique [0002] The aging problem of power batteries runs through the entire use and maintenance process of electric vehicles. During the use of power batteries, factors such as the operating environment of electric vehicles, driving conditions, and battery charging schemes will all affect the capacity decay of batteries. However, due to the lack of a mathematical model that reflects the relationship between these influencing factors and the attenuation capacity of the battery, the study of the impact of these influencing factors on the life of the power battery still relies on the actual vehicle for experimental verification, which has a long verification period and high cost. [0003] Existing battery aging models can be divided into mec...

AI Technical Summary

Problems solved by technology

However, these empirical models are based on fitting the relationship between the capacity and time of the battery after a long period of continuous charging and discharging operation or a long period of continuous standing, and the situation that the charging and discharging and standing of the actual power battery are carried out alternately. There is a big discrepancy, resulting in low accuracy of this type of model for fitting the battery aging process

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