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Formation method of softly-packed lithium ion battery

A technology of lithium-ion batteries and chemical formation methods, applied in the field of lithium-ion batteries, can solve the problems of long production cycle and poor cycle performance of soft-pack lithium-ion batteries, and achieve short production cycle, suitable for large-scale industrial production, and high density and stability effects

Inactive Publication Date: 2017-05-17
DO FLUORIDE NEW ENERGY TECHNOLOGY CO LTD
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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 method for the formation of soft-pack lithium-ion batteries, which solves the problems of long production cycle of the existing formation methods and poor cycle performance of soft-pack lithium-ion batteries after formation

Method used

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  • Formation method of softly-packed lithium ion battery
  • Formation method of softly-packed lithium ion battery
  • Formation method of softly-packed lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The formation method of the soft pack lithium-ion battery of the present embodiment comprises the following steps:

[0033] 1) Clamp the aged soft-pack lithium-ion battery in the formation fixture of the high-temperature pressurized formation equipment, turn on the pressure switch to increase the pressure between the fixtures to the set value, and ensure the surface of the soft-pack lithium-ion battery on both sides The pressure is 1.5MPa;

[0034] Set the temperature value of the high-temperature pressurized formation equipment to 65°C, turn on the temperature switch, and raise the temperature of the soft-pack lithium-ion battery to 65°C;

[0035] 2) Formation: first use 0.03C current to precharge the soft-pack lithium-ion battery with a small current, the charging time is 30min, and the cut-off voltage is 3.0V; then use 0.5C current to charge with a constant current until the cut-off voltage is 3.6V; Constant current constant voltage charging, to cut-off voltage 4.2V...

Embodiment 2

[0040] The formation method of the soft pack lithium-ion battery of the present embodiment comprises the following steps:

[0041] 1) Clamp the aged soft-pack lithium-ion battery in the formation fixture of the high-temperature pressurized formation equipment, turn on the pressure switch to increase the pressure between the fixtures to the set value, and ensure the surface of the soft-pack lithium-ion battery on both sides The pressure is 2.9MPa;

[0042] Set the temperature value of the high-temperature pressurized formation equipment to 45°C, turn on the temperature switch, and raise the temperature of the soft-packed lithium-ion battery to 45°C;

[0043]2) Formation: first use 0.02C current to precharge the soft-pack lithium-ion battery with a small current, the charging time is 30min, and the cut-off voltage is 3.0V; then use 0.7C current to charge with a constant current until the cut-off voltage is 3.6V; Constant current constant voltage charging, to cut-off voltage 4.2...

Embodiment 3

[0048] The formation method of the soft pack lithium-ion battery of the present embodiment comprises the following steps:

[0049] 1) Clamp the aged soft-pack lithium-ion battery in the formation fixture of the high-temperature pressurized formation equipment, turn on the pressure switch to increase the pressure between the fixtures to the set value, and ensure the surface of the soft-pack lithium-ion battery on both sides The pressure is 0.5MPa;

[0050] Set the temperature value of the high-temperature pressurized formation equipment to 55°C, turn on the temperature switch, and raise the temperature of the soft-packed lithium-ion battery to 55°C;

[0051] 2) Formation: first use 0.01C current to pre-charge the soft-pack lithium-ion battery with a small current, the charging time is 30min, and the cut-off voltage is 3.0V; then use 0.1C constant current to charge until the cut-off voltage is 3.6V; then use 0.5C current Constant current constant voltage charging, to cut-off vo...

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Abstract

The invention relates to a formation method of a softly-packed lithium ion battery. The method comprises: using a 0.01-0.05 C current to perform low-current pre-charging to a softly-packed lithium ion battery till the cut-off voltage reaches 3.0 V; using a 0.1-1.0 C current to perform constant-current charging till the cut-off voltage reaches 3.6 V; and using a 0.5-3.0 C current to perform constant-current charging till the cut-off voltage reaches 4.2 V and the cut-off current reaches 0.01-1.0 C. In the formation process, the surface pressure of two sides of the softly-packed lithium ion battery is kept no less than 0.4 MPa, and the temperature of the softly-packed lithium ion battery is kept no more than 80 DEG C. In the formation process, pressure is applied to two sides of the battery, so that the positive and negative electrodes fully contact the separator film, the surface states of electrode pieces are balanced, and surface SEI films are uniformly formed. The formed softly-packed lithium ion battery has stable impact SEI films, is uniform in quality, less in defects, high in battery liquid retention and excellent in cycle performance and safety performance.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a formation method of a soft-pack lithium-ion battery. Background technique [0002] Lithium-ion batteries have the advantages of high working voltage, high energy density, small size, no memory effect and long life, and are widely used in 3C digital products, new energy electric vehicles and other fields. [0003] Lithium-ion battery formation refers to the process of charging a lithium-ion battery for the first time, in order to make the battery electrochemically active (the process of activating the lithium-ion battery material). Formation is to form a layer of solid electrolyte interfacial film (SEI film) on the surface of the negative electrode. The SEI film has the properties of a solid electrolyte and is an electronic insulator. But this SEI film is Li + good conductor of Li + Can freely pass through the SEI membrane. The main component of the...

Claims

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Application Information

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IPC IPC(8): H01M10/04H01M10/058
CPCH01M10/0468H01M10/058Y02E60/10Y02P70/50
Inventor 许飞赵永锋王攀王玉峰赵会方牛猛卫刘兴福高红艳马红涛张向举
Owner DO FLUORIDE NEW ENERGY TECHNOLOGY CO LTD
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