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A kind of formation method of lithium ion battery

A lithium-ion battery and a formation method technology, applied in the field of formation of lithium-ion batteries, can solve the problems affecting the safety performance and high-temperature cycle performance of the battery, the SEI film is not dense and stable enough, etc., and achieves excellent high-temperature cycle performance, small internal resistance, and improved The effect of stability

Active Publication Date: 2021-06-11
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing chemical formation process mostly uses charging the battery directly to 3.6-3.8V. The SEI film formed in this method is not dense and stable enough, which will affect the safety performance and high-temperature cycle performance of the battery in the later stage.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The invention proposes a lithium-ion battery forming method, which uses a preset current to charge the battery to 4.2V, and then discharges to 3.6-3.85V, and vacuumizes the battery during the forming process.

Embodiment 2

[0017] A kind of formation method of lithium ion battery proposed by the present invention comprises the following steps:

[0018] (1) Put it aside for 5 minutes, charge the battery with a constant current of 0.01CmA, limit the voltage to 2.8V, and limit the time to 30 minutes;

[0019] (2) Put it aside for 3 minutes, charge the battery with a constant current of 0.1CmA, limit the voltage to 3.4V, and limit the time to 30 minutes;

[0020] (3) Put it on hold for 3 minutes, charge the battery with a constant current at a current of 0.5CmA, limit the voltage to 4.2V, charge at a constant voltage to a current limit of 0.05CmA, and limit the time to 100 minutes;

[0021] (4) Leave it on hold for 3 minutes, discharge the battery with a constant current of 0.01CmA, limit the voltage to 3.6V, and discharge the battery at a constant voltage to a current limit of 0.05CmA for a time limit of 100min;

[0022] (5) SHELBED.

[0023] The battery is evacuated during the entire formation pr...

Embodiment 3

[0025] A kind of formation method of lithium ion battery proposed by the present invention comprises the following steps:

[0026] (1) Put it on hold for 5 minutes, charge the battery with a constant current of 0.2CmA, limit the voltage to 3.2V, and limit the time to 100 minutes;

[0027] (2) Put it aside for 3 minutes, charge the battery with a constant current of 0.2CmA, limit the voltage to 3.6V, and limit the time to 100 minutes;

[0028] (3) Put it on hold for 3 minutes, charge the battery with a constant current at a current of 0.2CmA, limit the voltage to 4.2V, charge at a constant voltage to a current limit of 0.05CmA, and limit the time to 540min;

[0029] (4) Leave it on hold for 3 minutes, discharge the battery at a constant current of 0.5CmA, limit the voltage to 3.7V, discharge at constant voltage to a current limit of 0.05CmA, and limit the time to 360min;

[0030] (5) SHELBED.

[0031] The battery is evacuated during the entire formation process. After the for...

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PUM

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Abstract

The invention discloses a formation method of a lithium-ion battery, which relates to the technical field of lithium-ion batteries. The battery is charged to 4.2V with a preset current, and then discharged to 3.6-3.85V, and the battery is vacuumized during the formation process. The invention utilizes high-voltage chemical formation to completely react the side reactions in the formation process of the SEI film, and the formed SEI film is denser and more stable. Experimental results show that the lithium ion battery obtained by the chemical formation method of the present invention has smaller internal resistance, thinner battery thickness and excellent high-temperature cycle performance.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a formation method of lithium ion batteries. Background technique [0002] Modern society pays more and more attention to the safety performance and cycle performance of power batteries. The safety performance and cycle performance of power batteries are related to the safety factor and service life of new energy vehicles, and are important indicators for people to choose new energy vehicles. [0003] Formation is an important link in the battery manufacturing process, which plays a link between the previous and the next. Its function is to form a layer of solid electrolyte interfacial film (SEI film) on the internal electrode material of the battery during the first charge and discharge process of the battery. SEI Whether the membrane is good or bad is related to the safety performance and high temperature cycle performance of the battery in use. The existing che...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/058H01M10/0525
CPCH01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 刘海青夏劲张千
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY