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Battery grading method

A grading, battery technology, applied in secondary batteries, secondary battery manufacturing, non-aqueous electrolyte batteries, etc., can solve the problems of lithium-ion battery cycle life and other performance degradation, poor internal resistance consistency, etc.

Active Publication Date: 2017-10-27
CHERY AUTOMOBILE CO LTD
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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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Embodiment Construction

[0040] In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0041] In order to overcome the problems existing in the related technology, the embodiment of the present invention provides a method for classifying batteries. In addition, according to the polarization internal resistance, the single cells that belong to the same class after two binnings are classified again, so as to simulate the actual use scene of the single cells, so that the single cells in the same class are used for When grouping, the consistency of the internal resistance of the above-mentioned single cells in the same gear is better, thereby improving performance such as the cycle life of each single cell after grouping.

[0042] Among them, a single battery refers to a battery that exists in a single form without internal ...

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Abstract

The embodiment of the invention discloses a battery grading method, and belongs to the technical field of the battery. The method comprises the following steps: performing the first grading on each battery cell according to the battery capacity of each battery cell; performing the second grading on each battery cell belonging to the same grade after the first grading according to the ohm internal resistance of each battery cell belonging to the same grade after the first grading; and performing the third grading on each battery cell belonging to the same grade after the second grading according to the polarized internal resistance of each battery cell belonging to the same grade after the second grading. By using the method disclosed by the embodiment of the invention, the actual use scene of the battery cell is simulated by using the battery capacity, the ohm internal resistance and the polarized internal resistance, the consistency of the internal resistances of the battery cells in the same grade is good when the battery cells in the same grade are used for performing the matching, and then the cycle life of each battery cell after the matching and like performance are promoted.

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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/42H01M10/44H01M10/058B07C5/344
CPCB07C5/344H01M10/04H01M10/058H01M10/4207H01M10/441Y02E60/10Y02P70/50
Inventor 赵志刚朱红曾祥兵
Owner CHERY AUTOMOBILE CO LTD
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