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Formation process for lithium ion cell with high energy density

A high-energy density, lithium-ion technology, applied in the field of lithium-ion batteries, to achieve stable film formation, improve black spot interface problems, and close contact.

Active Publication Date: 2017-01-04
DONGGUAN LIWINON ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a high-energy-density lithium-ion battery formation process for the deficiencies of the prior art, so as to improve the black spot interface and poor edge displacement problems encountered in the formation process, and at the same time improve the formation process. efficiency and productivity

Method used

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  • Formation process for lithium ion cell with high energy density

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A high energy density lithium-ion cell formation process, comprising the following steps:

[0020] 1) Pre-treatment stage: At room temperature, inject electrolyte solution into the cell and let it stand for 12 hours, then place the cell at 45°C for 16 hours.

[0021] 2) Formation stage: step 1, charge the battery with a constant current of 0.05C, first apply a pressure of 300kgf to the battery, and charge for 20 minutes; then pressurize the battery to 0.2MPa, charge for 15 minutes; finally pressurize the battery To 0.3MPa, charge for 10min; the actual voltage of the cell is 2.5V; step 2, apply a pressure of 0.4MPa to the cell obtained in step 1, and charge it with a constant current of 0.2C, and the charging time is 20min; step 3, Keep the pressure of 0.4MPa, and charge the cell obtained in step 2 with a constant current of 0.8C, and the charging time is 60min. The operating temperature of the formation stage is 75°C.

[0022] 3) Baking treatment stage: Baking the cel...

Embodiment 2

[0024] A high energy density lithium-ion cell formation process, comprising the following steps:

[0025] 1) Pre-treatment stage: At room temperature, inject electrolyte solution into the cell and let it stand for 18 hours, then place the cell at 40°C for 20 hours.

[0026] 2) Formation stage: step 1, charge the cell with a constant current of 0.05C, first apply a pressure of 400kgf to the cell, charge for 18 minutes; then pressurize the cell to 0.25MPa, charge for 12 minutes; finally pressurize the cell To 0.35MPa, charge for 10min; the actual voltage of the cell is 3.0V; step 2, apply a pressure of 0.45MPa to the cell obtained in step 1, and charge it with a constant current of 0.2C, and the charging time is 20min; step 3, Keep the pressure of 0.45MPa, and charge the cell obtained in step 2 with a constant current of 0.9C, and the charging time is 50min. The operating temperature of the formation stage is 80°C.

[0027] 3) Baking treatment stage: Baking the cell obtained i...

Embodiment 3

[0029] A high energy density lithium-ion cell formation process, comprising the following steps:

[0030] 1) Pre-treatment stage: At room temperature, inject electrolyte solution into the cell, let it stand for 24 hours, then place the cell at 40°C, and let it stand for 24 hours.

[0031] 2) Formation stage: step 1, charge the battery with a constant current of 0.05C, first apply a pressure of 500kgf to the battery, and charge for 15 minutes; then pressurize the battery to 0.3MPa, charge for 10 minutes; finally pressurize the battery To 0.4MPa, charge for 5min; the actual voltage of the cell is 3.0V; step 2, apply a pressure of 0.5MPa to the cell obtained in step 1, and charge it with a constant current of 0.2C, and the charging time is 20min; step 3, Maintain a pressure of 0.5MPa, and charge the cell obtained in step 2 with a constant current of 1.0C for 40 minutes. The operating temperature of the formation stage is 85°C.

[0032] 3) Baking treatment stage: Baking the cell...

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Abstract

The invention belongs to the technical field of lithium ion batteries, in particular to a formation process for a lithium ion cell with high energy density. During the formation process of the cell, a form of segmental pressurization is adopted, the cell is charged under the conditions of small pressure and low current, on the one hand, through low-current charging in the first charging process, the reaction of Li+ and electrolyte is not too violent, so that the gas production rate is reduced and the problems of cell trimming and displacement are alleviated; on the other hand, through the form of segmental pressurization, the gas generated by reaction is gradually discharged, so that a problem of a black spot interface caused by poor exhaust is effectively improved. In addition, the generated gas is gradually increased along with the deepening of formation; through increasing the surface pressure and current, the contact is closer, so that formation is more stable while the formation efficiency and the capacity are improved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a formation process of high energy density lithium ion batteries. Background technique [0002] Lithium-ion battery, as a kind of green battery, has the advantages of high energy density, high working voltage and long cycle life. In recent years, it has been widely used in mobile devices such as mobile phones, notebook computers, UPS power supplies, and electric vehicles. [0003] The expansion of application fields and the increase in battery demand have prompted battery cell manufacturers to refine the process, shorten the process time and improve production efficiency to meet market demand. With the improvement of mechanization in the battery cell industry, the formation process has become an important link that currently restricts production efficiency. As the market demand for high-energy density products deepens, high-energy-density batteries have...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M10/058H01M10/44
CPCH01M10/0525H01M10/058H01M10/446Y02E60/10Y02P70/50
Inventor 张俊俊黄敬平于紫阳陈劲松李载波王威杨山何敏龙
Owner DONGGUAN LIWINON ENERGY TECH
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