Formation process for improving cycle thickness expansion of soft package lithium-ion battery

A lithium-ion battery and soft pack technology, applied in the field of lithium-ion batteries, can solve the problems of easy deformation of the battery, increase the deformation of the battery, affect the electrical performance of the battery, etc., so as to improve the electrochemical performance, reduce the thickness expansion rate, and ensure the infiltration effect of effect

Inactive Publication Date: 2020-05-08
TIANJIN LISHEN BATTERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the production process, we found that because the hardness of the aluminum-plastic shell is lower than that of the aluminum shell, the battery with a large aspect ratio is prone to deformation during the cycle, and its deformation changes in an arched shape along the length, which will make the battery super thick and Can not meet the design requirements
[0003] Chinese patent 201210371810.9 discloses a method for the formation of lithium-ion soft-pack batteries. This method mainly injects electrolyte solution under a carbon dioxide atmosphere, charges the battery to a saturated state after a period of time, and then discharges the battery, and then recharges the battery. Charging to a half-saturated state, but this method has problems such as that the gas existing between the pole pieces cannot be completely discharged, the deformation of the battery is increased, and a good SEI film cannot be formed, which affects the electrical performance of the battery.

Method used

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  • Formation process for improving cycle thickness expansion of soft package lithium-ion battery
  • Formation process for improving cycle thickness expansion of soft package lithium-ion battery
  • Formation process for improving cycle thickness expansion of soft package lithium-ion battery

Examples

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Effect test

Embodiment 1

[0014] A formation process for improving the cycle thickness expansion of a soft-packed lithium-ion battery, comprising the following steps: using an Arbin system to monitor the voltage of the static battery after filling the battery cell, and using a fixture formation device to perform formation under a specific pressure, temperature and charging system.

[0015] Wherein, the standing time is when the slope of the Arbin curve is 1;

[0016] In the operation of lithium battery formation, the temperature of the fixture is 40°C, the pressure exerted by the fixture on the cell body is 2Mpa / 2pcs, and the charging system is step constant current charging. In a charging operation, the current level is 0.05 C, and the battery is charged to 3% SOC. In the secondary charging operation, the current level is 0.7C, and the battery is charged to 49% SOC. After the second charge, the cell was removed and placed in a constant temperature and humidity environment for vacuuming, the vacuum de...

Embodiment 2

[0018] A formation process for improving the cycle thickness expansion of a soft-packed lithium-ion battery, comprising the following steps: using an Arbin system to monitor the voltage of the static battery after filling the battery cell, and using a fixture formation device to perform formation under a specific pressure, temperature and charging system.

[0019] Wherein, the standing time is when the Arbin curve slope is 0.5;

[0020] In the operation of lithium battery formation, the temperature of the fixture is 60°C, the pressure exerted by the fixture on the cell body is 1Mpa / 2pcs, and the charging system is step constant current charging. In a charging operation, the current level is 0.1 C, and the battery is charged to 5% SOC. In the secondary charging operation, the current is 1C, and the battery is charged to 65% SOC. After recharging, the cell was removed and placed in a constant temperature and humidity environment for vacuuming, the vacuum degree was maintained a...

Embodiment 3

[0022] A formation process for improving the cycle thickness expansion of a soft-packed lithium-ion battery, comprising the following steps: using an Arbin system to monitor the voltage of the static battery after filling the battery cell, and using a fixture formation device to perform formation under a specific pressure, temperature and charging system.

[0023] Wherein, the standing time is when the slope of the Arbin curve is 0;

[0024] In the operation of lithium battery formation, the temperature of the fixture is 90°C, the pressure exerted by the fixture on the cell body is 0.2MPa / 2pcs, and the charging system is step constant current charging. In a charging operation, the current level is 0.3C, and the battery is charged to 7% SOC. In the secondary charging operation, the current is 1.5C, and the battery is charged to 75% SOC. After the second charge, the battery cell was removed and placed in a constant temperature and humidity environment for vacuuming. The vacuum ...

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Abstract

The invention relates to the technical field of lithium-ion batteries, in particular to a formation process for improving cycle thickness expansion of a soft package lithium-ion battery. The process comprises the following steps: 1, standing battery cells after liquid injection, putting a plurality of battery cells into an Arbin test system for voltage measurement, and drawing a voltage and time curve graph; and 2, standing the battery cells, and putting the battery cells into clamp formation equipment for formation. The infiltration state of an electrolyte in the battery cell can be accurately monitored, and the infiltration effect is ensured. In the clamp formation process, all layers of interfaces in the battery cells can be in close contact by exhausting air from the battery cells, sothat the battery cells are uniformly stressed and heated.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a chemical formation process and a method for improving cycle thickness expansion of soft-pack lithium-ion batteries. Background technique [0002] In recent years, with the continuous in-depth application of lithium-ion batteries in new energy vehicles, energy storage systems and 3C products, the research on lithium-ion batteries has also gone from the existing external electrical performance testing to the internal structure research. Consumer lithium batteries mostly use aluminum-plastic packages, and their size and thickness can be changed with changes in design requirements. Compared with aluminum shells, aluminum-plastic films have lower surface density and higher energy density. . However, during the production process, we found that because the hardness of the aluminum-plastic shell is lower than that of the aluminum shell, the battery with a large aspect r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/44H01M10/058H01M10/0525
CPCH01M10/0525H01M10/058H01M10/446Y02E60/10Y02P70/50
Inventor 夏晓萌孔令丽张克军蔡嘉兴杨玉秋
Owner TIANJIN LISHEN BATTERY
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