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Long-term storage method of lithium ion battery

A lithium-ion battery, long-term storage technology, applied in the field of long-term storage of lithium-ion batteries, can solve the problems of life performance decline, internal resistance rise, difficulty in maintaining battery life, etc., and achieve a stable effect

Active Publication Date: 2019-12-03
泰州纳新新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the long-term storage of lithium-ion batteries, the electrolyte will be deposited on the electrode surface, resulting in a decrease in the reversible capacity of the battery, an increase in internal resistance, and a decrease in life performance. In addition, the traditional activation method generally uses a predetermined cycle to cycle the battery several times. Difficulty maintaining battery life

Method used

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  • Long-term storage method of lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 1) Take out the battery that has been stored for 3 months;

[0034] 2), discharge the battery to the discharge cut-off voltage, and the discharge cut-off voltage is 2.7V;

[0035] 3) At 30°C, the battery is subjected to pulse charge and discharge cycles for 10 times between the discharge cut-off voltage and the first predetermined voltage, the first predetermined voltage is 2.67V, the pulse current is 0.05C, the pulse time is 60s, and the interval 10s;

[0036] 4) At 35°C, the battery is subjected to pulse charge and discharge cycles for 10 times between the discharge cut-off voltage and the second predetermined voltage, the second predetermined voltage is 2.65V, the pulse current is 0.02C, the pulse time is 30s, and the interval 10s;

[0037] 5) At 10°C, charge the battery with a constant current to the third predetermined voltage, then charge and discharge 5 times at 0.5C between the third predetermined voltage and the fourth predetermined voltage, and then charge a...

Embodiment 2

[0043] 1) Take out the battery that has been stored for 10 days;

[0044] 2), discharging the battery to the discharge cut-off voltage, the discharge cut-off voltage is 2.75V;

[0045] 3) At 35°C, the battery is subjected to pulse charge and discharge cycles for 10 times between the discharge cut-off voltage and the first predetermined voltage, the first predetermined voltage is 2.7V, the pulse current is 0.1C, the pulse time is 20s, and the interval 5s;

[0046] 4) At 40°C, the battery is subjected to pulse charge and discharge cycles for 10 times between the discharge cut-off voltage and the second predetermined voltage, the second predetermined voltage is 2.65V, the pulse current is 0.05C, the pulse time is 10s, and the interval 5s;

[0047] 5) At 10°C, charge the battery with a constant current to the third predetermined voltage, then charge and discharge 5 times at 0.5C between the third predetermined voltage and the fourth predetermined voltage, and then charge and dis...

Embodiment 3

[0053] 1) Take out the battery that has been stored for one month;

[0054] 2), discharging the battery to the discharge cut-off voltage, the discharge cut-off voltage is 2.75V;

[0055] 3) At 35°C, the battery is subjected to pulse charge and discharge cycles for 10 times between the discharge cut-off voltage and the first predetermined voltage, the first predetermined voltage is 2.7V, the pulse current is 0.05C, the pulse time is 30s, and the interval 10s;

[0056] 4) At 40°C, the battery is subjected to pulse charge and discharge cycles for 10 times between the discharge cut-off voltage and the second predetermined voltage, the second predetermined voltage is 2.65, the pulse current is 0.02C, the pulse time is 20s, and the interval is 5s ;

[0057]5) At 5°C, charge the battery with a constant current to the third predetermined voltage, then charge and discharge 5 times at 0.5C between the third predetermined voltage and the fourth predetermined voltage, and then charge an...

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Abstract

The invention provides a long-term storage method of a lithium ion battery. The lithium ion battery can be stored for a long time by using the storage method provided by the invention, and the batterycapacity retention rate is high after storage. The storage method provided by the invention comprises the steps that the battery is discharged at predetermined intervals; high-temperature pulse current activation is carried out near the discharge cut-off voltage, and low-temperature large-current activation is carried out within a predetermined voltage range; and constant voltage activation is carried out near the charge cut-off voltage. According to the invention, during the activation process, different activation steps are carried out with different temperature ranges, which can maximize the effect of activation and improve the capacity retention rate of the battery.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a long-term storage method for lithium ion batteries. Background technique [0002] Lithium-ion batteries are considered to be the most ideal energy storage components because of their advantages such as high energy density, long cycle life and no memory effect. During the long-term storage of lithium-ion batteries, the electrolyte will be deposited on the electrode surface, resulting in a decrease in the reversible capacity of the battery, an increase in internal resistance, and a decrease in life performance. In addition, the traditional activation method generally uses a predetermined cycle to cycle the battery several times. Difficulty maintaining battery life. Contents of the invention [0003] In view of the above problems, the present invention provides a long-term storage method for lithium-ion batteries. The lithium-ion batteries can be stored for a long...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/42H01M10/44
CPCH01M10/4242H01M10/446H01M10/448Y02E60/10
Inventor 王现思
Owner 泰州纳新新能源科技有限公司
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