Method of quickly detecting cycle performance of battery

Abstract

The invention provides a method of quickly detecting the cycle performance of a battery. The method comprises the following steps: two batteries of the same model are taken as comparison samples, thecapacity retention rates corresponding to different cycle times under a normal temperature environment and a low temperature environment are tested respectively, and cycle curve diagrams are built respectively; the corresponding relationship between the cycle curve diagrams built under the two environments is acquired; a cycle curve in the low temperature environment corresponding to the battery cycle performance in the normal temperature environment is selected as a standard diagram; and a tested battery with the same model as the comparison sample is subjected to cycle detection in the low temperature environment, the standard diagram is compared, the corresponding capacity retention rate of the tested battery in the normal temperature environment is estimated, and further, the cycle performance of the tested battery at the normal temperature is detected. The application is convenient, the prediction is accurate, and the measurement period is short.

Description

technical field [0001] The invention relates to the technical field of battery detection, in particular to a rapid detection method for the cycle performance of lithium-ion batteries. Background technique [0002] Cycle performance, that is, cycle life, is an important indicator of a battery, which refers to the number of complete charge and discharge cycles experienced by a new battery from use to scrap under certain conditions of use. The cycle performance of the battery is usually recorded when the discharge capacity reaches 80% of the initial capacity. Due to the difference in production level and product system, the cycle life is hundreds or even tens of thousands of cycles. Calculated as 2 hours per cycle, the minimum is 3-5 months, as many as 6-12 months or even longer, the test takes too long, which directly restricts the battery development cycle. [0003] Therefore, it is necessary to find a method that can quickly test the battery cycle performance, whether it is...

AI Technical Summary

Problems solved by technology

[0004] In view of the problems that the existing battery cycle performance detection technology takes a long time and cannot quickly evaluate the battery cycle performance, the purpose of the present invention is to propose a rapid detection method for detecting battery cycle performance that is convenient for application, further improves prediction accuracy, and has a short measurement period. Method for battery cycle performance

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