Method for predicting life of power battery

Abstract

The invention discloses a method for predicting the life of a power battery. The method includes the following steps: first a using temperature range of a battery is confirmed, at least three temperatures are taken in the temperature range, including the lowest temperature and the highest temperature; then the battery is stored for at least three time periods at selected temperatures and under a specified state of charge and a charging and discharging test is carried out; after the test is finished, a capacity test is carried out; finally, Ea and InA are determined according to a formula; and the life of the battery at any specific temperature and under a specified capacity fading condition can be calculated according to the determined Ea and InA. The advantages of the method for predicting the life of the power battery are that influence of internal factors on the life of the battery are mainly considered, external usage temperature is regarded as an influence factor, the life attenuation condition at any temperature in any time period is rapidly obtained, the test period is short, the test cost is low, the method does not need a large amount of charging and discharging equipment, and the test difficulty is low.

Description

technical field [0001] The invention relates to the field of power batteries, in particular to a method for predicting the life of a power battery. Background technique [0002] The use of the power battery has a great correlation with the actual service life of the battery. How to objectively and effectively predict the service life of the power battery is related to the price of the battery, customer maintenance and other aspects. Both the customer and the manufacturer are very concerned Can accurately predict the actual service life of the battery. There are many factors that affect the life of a battery. From an internal point of view, there are mainly materials, including positive electrode materials, negative electrode materials, separators, battery components, production process control, Pack structure design, etc. External factors include the use environment, charge and discharge current program , regular maintenance, etc., how to effectively evaluate battery life h...

AI Technical Summary

Problems solved by technology

[0004] Purpose of the invention: In view of the above problems, the purpose of the present invention is to provide a battery life prediction method, which solves the problem that the existing battery life prediction method requires a large number of charging and discharging equipment, and the test time period is long, and at the same time quantifies the impact of temperature on battery life.

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