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A screening method for lithium-ion battery cells based on a thermal imager

A lithium-ion battery, thermal imager technology, used in sorting and other directions, can solve problems such as threats to personal and property safety, combustion and even explosion, and achieve the effect of improving product quality and safety performance

Active Publication Date: 2021-09-03
JIANGXI DIBIKE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the vast majority of lithium battery manufacturers basically screen these abnormal cells by the voltage after the cells are formed and aged at room temperature or high temperature. However, during the process of cell formation and aging, it is easy to cause combustion or even explosion accidents. Threats to personal and property safety

Method used

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  • A screening method for lithium-ion battery cells based on a thermal imager
  • A screening method for lithium-ion battery cells based on a thermal imager

Examples

Experimental program
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Effect test

Embodiment 1

[0028] A kind of screening method based on the lithium-ion battery cell of thermal imager, it comprises the steps:

[0029] S1: Put the activated battery on the forming cabinet, after forming and charging to 65%-75% SOC, let it stand on the forming cabinet for 15±1min;

[0030] S2: Use the thermal imager to scan the battery cell, and judge whether the battery cell is normal through the color difference displayed on the thermal imager. The abnormal cell is bright yellow, and the normal cell is dark red. If it is normal, enter S3. Abnormal Then enter S14;

[0031] S3: Turn the normal battery in S2 into full charge and let it stand for 15±1min;

[0032] S4: Repeat S2 to judge whether the battery is normal, if normal, enter S5, and if abnormal, enter S14;

[0033] S5: After the formation is completed, put the battery cells into the material tank, lay it flat and let it stand for 2 hours, and remove the abnormal batteries every 1 hour / time of thermal imaging scan, if it is normal...

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Abstract

The invention discloses a method for screening lithium-ion battery cells based on a thermal imager. Using thermal imaging technology, the lithium battery is charged to 65%-75% SOC for the first time, charged to 100% SOC, fully charged and left standing, In the state of the second full charge and the end of the capacity separation, thermal imaging scans are performed separately to detect the internal micro-short circuit and excessive side reactions of the battery. We can use this method to greatly reduce the battery's formation, aging, The risk of combustion and explosion in the process of capacity separation and storage reduces the risk of abnormal batteries entering the market, and improves the screening quality and safety performance of products.

Description

technical field [0001] The invention belongs to the field of lithium battery manufacturing, and relates to a screening method for lithium-ion battery cells based on a thermal imager. Background technique [0002] Lithium batteries have the characteristics of high energy density, long service life, and high output power, and have gradually become the mainstream in markets such as mobile phones, notebooks, mobile power supplies, electric bicycles, automobiles, and energy storage. With the promotion and application of lithium batteries, safety accidents characterized by thermal runaway during the charging process have occurred from time to time, causing property losses and threats to personal safety of manufacturers and consumers. [0003] Most of the reasons ultimately point to the defects inside the battery itself. Due to the numerous and complex procedures in the lithium battery manufacturing process and the harsh manufacturing environment, there are many factors that affec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B07C5/344
CPCB07C5/344
Inventor 付建伟
Owner JIANGXI DIBIKE
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