Battery cycle life prediction method

Abstract

The invention discloses a cycle system mode capable of achieving life prediction. The cycle system mode comprises the following steps: placing a to-be-evaluated battery in a cycling condition needing to be evaluated to perform a cycle test, recording an accumulated cycle frequency and the cycle capacity maintenance rate of the battery, performing small-current charging and discharging tests on the battery after each certain cycle frequency or capacity loss rate at the same time, recording voltage and capacity data of the battery in the charging and discharging process, and recording the corresponding cycle frequency and the corresponding capacity maintenance rate; and then performing data fitting and calculation according to the accumulated cycle frequency and the cycle capacity maintenance rate of the battery and differential data of the capacity on voltage, and performing prediction on the battery cycle life. Compared with a conventional cycle test, the cycle system mode greatly shortens the service life evaluation period and prevents energy consumption and resource waste which are generated by a long-term test; and, furthermore, because the data fitting is performed on the basis of short-term actually measured data, the cycle system mode has higher universality and high prediction accuracy compared with a pure theory calculation and experience model.

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 ...

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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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