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Method for improving safety of cylindrical lithium ion battery

A lithium-ion battery, cylindrical technology, used in secondary batteries, battery pack components, battery boxes/jackets, etc., can solve problems such as easy safety risks and excessive battery pressure, shorten the formation time, and increase production capacity. , the effect of preventing dark spots

Pending Publication Date: 2022-05-10
GUIZHOU MEILING POWER SUPPLY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention intends to provide a method capable of improving the exhaust of a cylindrical lithium-ion battery, so as to solve the problem in the prior art that the internal pressure of the battery is too high and it is easy to cause safety risks

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1, a method for improving the safety of a cylindrical lithium-ion battery, all the following operations are carried out in an environment with a humidity of 1% to 3%, and the steps are as follows:

[0019] Step 1. After the liquid injection of the cylindrical lithium-ion battery cell is completed, only cover it without sealing it, and pre-charge it after an interval of 20 minutes. The charging rate during pre-charging is 0.3C, and the charging time is 8 minutes;

[0020] Step 2. After pre-charging the cylindrical lithium-ion battery, put it aside at 45-55°C;

[0021] Step 3. The cylindrical lithium-ion battery after shelving is formed under the pressure condition of 0.06-0.08KPa. The formation operation steps are as follows:

[0022] ①Stand aside for 30min, the purpose is to keep the temperature of the battery constant; ②0.04C constant current charge for 10min; ③Stand aside for 10min; ④0.05C constant current charge to 3.0V; ; ⑧0.2C constant current charging ...

Embodiment 2

[0024] Embodiment 2, a method for improving the safety of a cylindrical lithium-ion battery, all the following operations are carried out in an environment with a humidity of 1% to 3%, and the steps are as follows:

[0025] Step 1. After the liquid injection of the cylindrical lithium-ion battery cell is completed, only cover it without sealing it, and pre-charge it after an interval of 60 minutes. The charging rate during pre-charging is 0.1C, and the charging time is 15 minutes;

[0026] Step 2. After pre-charging the cylindrical lithium-ion battery, put it aside at 45-55°C;

[0027] Step 3. The cylindrical lithium-ion battery after shelving is formed under the pressure condition of 0.06-0.08KPa. The formation operation steps are as follows:

[0028] ①Stand aside for 60min;②0.02C constant current charge for 7min;③stand for 5min;④0.04C constant current charge to 3.0V; to 3.75V;

[0029] Step 4: Seal the cylindrical lithium-ion battery after formation.

Embodiment 3

[0030] Embodiment 3, a method for improving the safety of a cylindrical lithium-ion battery, all the following operations are carried out in an environment with a humidity of 1% to 3%, and the steps are as follows:

[0031] Step 1. After the liquid injection of the cylindrical lithium-ion battery cell is completed, only cover it without sealing it, and pre-charge it after an interval of 40 minutes. The charging rate during pre-charging is 0.5C, and the charging time is 3 minutes;

[0032] Step 2. After pre-charging the cylindrical lithium-ion battery, put it aside at 45-55°C;

[0033] Step 3. The cylindrical lithium-ion battery after shelving is formed under the pressure condition of 0.06-0.08KPa. The formation operation steps are as follows:

[0034] ①Stand aside for 45min;②0.05C constant current charge for 8min;③stand for 8min;④0.02C constant current charge to 3.0V; to 3.75V;

[0035] Step 4: Seal the cylindrical lithium-ion battery after formation.

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Abstract

The invention discloses a method for improving the safety of a cylindrical lithium ion battery in the technical field of lithium batteries, which comprises the following steps: after liquid injection of a battery cell of the cylindrical lithium ion battery is completed, only covering the battery cell with a cover without sealing, and then sequentially carrying out pre-charging, high-temperature shelving, negative-pressure formation and sealing; all the operations are carried out in an environment with the humidity of 1%-3%. According to the invention, the high-capacity cylindrical lithium ion battery is not sealed after liquid injection, so that gas generated in high-temperature shelving and negative pressure formation processes of the high-capacity cylindrical battery can be discharged in time, the internal pressure of the battery can be reduced, and the safety of the battery in the use process is ensured.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, in particular to a method for improving the safety of cylindrical lithium ion batteries. Background technique [0002] Cylindrical lithium-ion batteries are the earliest commercially used batteries, and are widely used in both civilian and military applications. Cylindrical lithium-ion batteries can be sealed after liquid injection, and then activated by formation after shelving at high temperature. During the electrochemical formation of lithium ions, the battery will generate a large amount of gas. The soft-pack lithium-ion battery can discharge the gas into the air bag, while the cylindrical lithium-ion battery cannot discharge the gas generated by the formation due to its own structure and manufacturing process, resulting in The internal pressure of the battery is too high, and there is a safety problem. Although the upper cover of the cylindrical battery mostly has a vent valve, ...

Claims

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Application Information

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IPC IPC(8): H01M10/058H01M10/42H01M10/0525H01M50/107
CPCH01M10/058H01M10/42H01M10/0525H01M50/107Y02P70/50
Inventor 王储王庆杰蔡波田进付紫微张扬冉昕昕杨中发徐星
Owner GUIZHOU MEILING POWER SUPPLY CO LTD
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