Battery selecting method

Abstract

The invention discloses a battery selecting method comprising steps of performing fully charging and discharging circles and measuring capacities of a plurality of batteries; calculating the average battery capacity value and calculating relative deviations; removing batteries that have large discharging capacity deviations; performing charging and discharging processes, and measuring voltages in the processes; calculating the average voltage value and calculating relative deviations; and selecting batteries with good consistency. According to the selecting method provided by the invention, by selecting firstly according to discharging capacities of batteries, and then by performing charging and discharging tests close to actual working conditions for the batteries and measuring voltages, batteries with good consistency are selected rapidly and accurately, thereby raising the accuracy of battery selecting, improving battery pack security, and prolonging battery service lifetime.

Description

technical field [0001] The invention relates to a battery screening method. Background technique [0002] In recent years, with the further intensification of the traditional fossil energy crisis and the rapid development of the new energy industry, the application of power batteries has made great progress, especially in the fields of electric vehicles. Due to the differences in raw materials, manufacturing processes, components and micro-environments of batteries, there will inevitably be certain differences between single batteries. The more batteries used in combination, the more obvious the differences between batteries. For batteries The service life and safety performance of the group will be greatly affected. Therefore, it is very important to improve the consistency of assembled batteries through appropriate screening methods. [0003] In the consistency of the battery, the large difference in the capacity of the battery will cause a large difference in the discha...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome that the battery screening method in the prior art only screens batteries by static parameters such as static pressure difference, static capacity difference or AC internal resistance, so it cannot quickly and accurately screen different cells. Based on the defects of bulk battery screening, a battery screening method is proposed

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