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A screening method for lithium-ion batteries

A technology of a lithium ion battery and a screening method, which is applied in the field of lithium ion battery screening, can solve the problems of excessively fast capacity decay and short life of the battery pack

Active Publication Date: 2018-07-17
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when multiple batteries are connected in series or in parallel, the battery pack often has the problem of rapid capacity decay and short life, which is caused by the inconsistency between battery cells

Method used

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  • A screening method for lithium-ion batteries

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Embodiment Construction

[0022] The present invention will be further described below in conjunction with accompanying drawing:

[0023] The screening method of the lithium-ion battery of the present embodiment, comprises the following steps:

[0024] Take 50 IFP20100140 single cells with a nominal capacity of 30Ah, number 1-30 for backup, and proceed according to the content of the present invention:

[0025] S1: Use 15A current to fully charge and discharge 50 batteries for 5 weeks, and the full state is cut off for backup; record the discharge capacity C0 to C50 for backup in the fifth week, and the selected capacity range is between 102.5% and 97.5% of its rated capacity Single batteries, that is, select batteries with a capacity of 29.25Ah to 30.75Ah, and reject batteries that do not meet the standards.

[0026] S2: Test the AC internal resistance ACR1-ACR50 of the above-mentioned cells that meet the capacity consistency standard (the above-mentioned cells that do not meet the capacity consisten...

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Abstract

The invention relates to a method for screening lithium ion batteries.The method includes the steps that capacity consistency screening is conducted on batteries of the same bath; cores meeting the capacity requirement are subjected to alternating-current internal resistance consistency screening; the cores meeting the alternating-current consistency requirement are subjected to direct-current internal resistance consistency screening; the cores meeting the direct-current internal resistance consistency are subjected to direct-current internal resistance and alternating-current internal resistance ration consistency screening.The batteries are screened according to direct-current internal resistance and alternating-current internal resistance characteristics, the batteries high in consistency can be quickly and accurately screened for matching, use performance of battery packs is improved, and the service life of the battery packs is prolonged.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a screening method for lithium ion batteries. Background technique [0002] Lithium-ion batteries are widely used due to their high energy density and long cycle life. However, when multiple batteries are connected in series or in parallel, the battery pack often has the problem of too fast capacity decay and short life, which is caused by the inconsistency between the battery cells. How to use a simple and reliable sorting method to screen out batteries with as consistent performance as possible for grouping has important scientific and practical significance for the promotion and application of lithium-ion batteries in large-scale energy storage. Contents of the invention [0003] The object of the present invention is to provide a screening method for lithium ion batteries, the method. [0004] To achieve the above object, the present invention adopts the fol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/42H01M10/0525
CPCH01M10/0525H01M10/4207H01M10/4285Y02E60/10
Inventor 魏引利王海波侯守卫
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY