Method for evaluating capacity life of lithium battery of electric vehicle

The invention discloses a method for evaluating the capacity life of a lithium battery of an electric vehicle. The method comprises the following steps: S1, carrying out calendar life and cycle life tests on a single cell; s2, constructing a calendar life model and a cycle life model of the single cell; s3, the whole vehicle working condition information is counted; s4, converting the working condition information; and S5, evaluating the capacity life of the battery system. According to the method for evaluating the capacity life of the lithium battery of the electric vehicle, the test design is simplified, the evaluation method is optimized, the most stringent working condition of the battery is used for evaluation, and a capacity life evaluation conclusion can be obtained in a short time. 本发明公开了一种电动汽车锂电池容量寿命评估方法，包括以下步骤：S1、对单体电芯进行日历寿命和循环寿命测试；S2、构建单体电芯的日历寿命模型和循环寿命模型；S3、统计整车工况信息；S4、对工况信息进行转化；S5、电池系统容量寿命评估。本发明的电动汽车锂电池容量寿命评估方法，简化了试验设计，优化评价方法，使用电池最严苛的工况进行评估，可以在较短的时间内得到容量寿命评估结论。