Battery binning method

Abstract

The embodiment of the invention discloses a battery classification method, which belongs to the technical field of batteries. The method includes: according to the battery capacity of each single battery, classify each single battery for the first time; Each single cell belonging to the same class after binning shall be classified for the second time; according to the polarization internal resistance of each single cell belonging to the same class after the second binning, the battery belonging to the same class after the second binning Each single battery is graded for the third time. The embodiment of the present invention simulates the actual use scene of the single battery by using parameters such as battery capacity, ohmic internal resistance, and polarization internal resistance, so that when the single battery in the same file is used for grouping, the above-mentioned single battery in the same file The consistency of the internal resistance of the battery is better, thereby improving the cycle life and other performances of each single battery after grouping.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of batteries, and in particular to a method for classifying batteries. Background technique [0002] In the case of high requirements on battery power and capacity, lithium-ion batteries are usually combined in series and parallel. In order to improve the cycle life and other performances of the combined lithium-ion batteries, it is necessary to select lithium-ion batteries with small differences for grouping. Among them, the process of selecting lithium-ion batteries with small differences is to carry out Binning. [0003] In the related art, lithium-ion batteries are classified according to their battery capacity and AC internal resistance. Specifically, first measure the battery capacity of the lithium-ion battery, classify the lithium-ion battery for the first time according to the battery capacity of the lithium-ion battery, then measure the AC internal resistance of the lith...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem in the related art that when the lithium-ion batteries are classified into different grades, the consistency of the internal resistance of the lithium-ion batteries belonging to the same grade is still poor, which in turn leads to the reduction of the performance of the lithium-ion batteries after grouping, such as cycle life, etc., the present invention The embodiment provides a battery classification method

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