Study of the factors affecting a lithium battery’s aging behavior

Abstract

It is the precondition and basis for ensuring the reasonable use of a battery to accurately calculate and predict the battery’s aging state. However, there are a lot of difficulties in accurately calculating the aging state of a battery. For example, there are a variety of stresses that have an impact on the aging of the battery, such as, temperature, charging and discharging currents, end of charge/discharge voltages. A battery’s aging behavior under a multi-stress effect has posed a tough challenge to experimental processes. Moreover, the way a different stress affects the aging of a battery is difficult to determine, and the coupling relations and coupling strength between different factors are not clear. Therefore, in this paper, the statistic method of analyzing major effects is used to have analyzed the degrees of the effect that the four stresses have on the battery’s aging. The results indicate that, as ranked in order of from more primary factors to more secondary factors, the four stresses are: i1> V1> i2> T (constant charging current > end-of-charge voltage > constant discharge current > ambient temperature), and all these four stresses have a significant effect on the battery’s capacity attenuation rate.