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Charging and discharging method for improving K value consistency of lithium ion battery

A lithium-ion battery, charging and discharging technology, applied in the field of lithium-ion batteries, can solve problems such as K value mismeasurement, bad product escape, good product misjudgment, etc., to eliminate battery polarization, improve K value consistency, and improve production efficiency Effect

Inactive Publication Date: 2021-04-30
HUIZHOU LIWINON NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to ensure accurate measurement of K value, it is necessary to eliminate the influence of polarization on the open circuit voltage as much as possible. If the polarization is too large, it will easily cause mismeasurement of K value, resulting in the escape of bad products and misjudgment of good products.
In order to reduce the problem of battery polarization, high-temperature aging and prolonging the physical method of standing time are mainly used at present, but this operation will increase the production cycle and production cost of lithium-ion batteries

Method used

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  • Charging and discharging method for improving K value consistency of lithium ion battery
  • Charging and discharging method for improving K value consistency of lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0023] A charging and discharging method for improving the K value consistency of a lithium-ion battery, comprising the following steps:

[0024] Before the K value test, take the lithium-ion battery that has been formed and aged at high temperature and carry out the following charging and discharging stages in sequence: the first constant current charging stage, the first constant voltage charging stage, the first constant current discharging stage, and the second constant current charging stage and the second constant current discharge stage;

[0025] The charging current in the first constant current charging stage is 1.0C, and it is charged to a cut-off voltage of 4.45V;

[0026] The charging voltage in the first constant voltage charging stage is 4.45V, and the charging reaches the cut-off current of 0.1C;

[0027] The discharge current in the first constant current discharge stage is 0.5C, and the discharge voltage is 3.0V;

[0028] The charging current of the second c...

Embodiment 2

[0031] A charging and discharging method for improving the K value consistency of a lithium-ion battery, comprising the following steps:

[0032] Before the K value test, take the lithium-ion battery that has been formed and aged at high temperature and carry out the following charging and discharging stages in sequence: the first constant current charging stage, the first constant voltage charging stage, the first constant current discharging stage, and the second constant current charging stage , the second constant voltage charging stage and the second constant current discharging stage;

[0033] The charging current in the first constant current charging stage is 1.0C, and it is charged to a cut-off voltage of 4.45V;

[0034] The charging voltage in the first constant voltage charging stage is 4.45V, and the charging reaches the cut-off current of 0.1C;

[0035] The discharge current in the first constant current discharge stage is 0.5C, and the discharge voltage is 3.0V;...

Embodiment 3

[0040] A charging and discharging method for improving the K value consistency of a lithium-ion battery, comprising the following steps:

[0041] Before the K value test, take the lithium-ion battery that has been formed and aged at high temperature and carry out the following charging and discharging stages in sequence: the first constant current charging stage, the first constant voltage charging stage, the first constant current discharging stage, and the second constant current charging stage , the second constant current discharge stage, the third constant current charge stage and the third constant current discharge stage;

[0042] The charging current in the first constant current charging stage is 1.0C, and it is charged to a cut-off voltage of 4.45V;

[0043] The charging voltage in the first constant voltage charging stage is 4.45V, and the charging reaches the cut-off current of 0.1C;

[0044] The discharge current in the first constant current discharge stage is 0...

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Abstract

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a charging and discharging method for improving K value consistency of a lithium ion battery. A lithium ion battery subjected to formation and high-temperature aging is sequentially subjected to the following charging and discharging stages: a first constant-current charging stage, a first constant-voltage charging stage, a first constant-current discharging stage, a second constant-current charging stage and a second constant-current discharging stage. Compared with the prior art, the charging and discharging method has the advantages that the polarization in the battery is quickly reduced, the consistency of the battery cell K value is improved, and the battery K value measurement time is shortened.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a charging and discharging method for improving the K value consistency of lithium ion batteries. Background technique [0002] Self-discharge refers to the phenomenon of battery capacity loss or voltage drop caused by the reaction of the internal substances of the battery when the battery is in an open circuit state. It is one of the main parameters to measure battery performance. The existence of battery self-discharge phenomenon not only causes the loss of energy of the battery itself, but also causes overcharging and over-discharging of the internal batteries of the battery pack due to the inconsistency of self-discharge among the batteries, which damages the battery, and then the capacity rapidly decays and the life span is shortened. Therefore, the self-discharge test of the battery is particularly important. [0003] At present, the self-discharg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/44H01M10/0525
CPCH01M10/44H01M10/0525Y02E60/10
Inventor 张晓伟谢安河刘志中赵云龙陈杰杨山李载波
Owner HUIZHOU LIWINON NEW ENERGY TECH CO LTD