Battery Cycle Life Prediction Method

Abstract

The invention discloses a cycle system capable of realizing life expectancy, which comprises the following steps: placing the battery to be evaluated in the cycle condition to be evaluated for cycle test, recording the accumulated cycle times and cycle capacity retention rate of the battery, and at the same time, A certain number of cycles or capacity loss rate, conduct a small current charge and discharge test on the battery, record the voltage and capacity data of the battery during this charge and discharge process, as well as the corresponding number of cycles and capacity retention rate; thus according to the cumulative number of cycles of the battery Carry out data fitting and calculation with the cycle capacity retention rate and the differential data of capacity versus voltage, and predict the cycle life of the battery. Compared with the conventional cycle test, the present invention greatly shortens the cycle of life evaluation and avoids the waste of energy consumption and resources caused by the long-term test; in addition, because the data fitting is carried out on the basis of short-term measured data, it is different from pure theoretical calculation Compared with the empirical model, it is more universal and has higher prediction accuracy.

Description

technical field [0001] The invention relates to a battery cycle life prediction method. Background technique [0002] With the development of lithium-ion battery technology and the improvement of customer requirements in specific fields, the cycle life of lithium-ion batteries has been greatly improved, especially in the field of electric vehicles, the cycle life of batteries has reached 1000 times or even more than 2000 times . [0003] As we all know, because the test of lithium-ion battery cycle life is time-consuming, it not only consumes a lot of equipment and energy, but also, as the longest item in battery performance testing, has become an important factor affecting the comprehensive performance evaluation in battery research and development. With the current situation that the development cycle given by customers is getting shorter and shorter, shortening the life evaluation cycle has become an urgent problem to be solved. [0004] In the process of analyzing and ...

AI Technical Summary

Problems solved by technology

[0003] As we all know, because the test of lithium-ion battery cycle life is time-consuming, it not only consumes a lot of equipment and energy, but also, as the longest item in battery performance testing, has become an important factor affecting the comprehensive performance evaluation in battery research and development. With the current situation that the development cycle given by customers is getting shorter and shorter, shortening the life evaluation cycle has become an urgent problem to be solved

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