Formation method for lithium ion battery

A lithium-ion battery and formation method technology, which is applied in the field of lithium-ion battery formation, can solve the problems affecting the consistency of battery capacity, serious gas production in battery formation, and large equipment labor investment, so as to shorten the formation time and reduce equipment labor. investment, the effect of increasing production capacity

Inactive Publication Date: 2012-12-19
JIANGSU LITIAN NEW ENERGY TECH
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Problems solved by technology

The battery using the above-mentioned formation method has severe formation and gas production, and is prone to partial overcharging, resulting in electrolyte decomposition and defects such as mottling and lithium precipitation on the surface of the negative electrode sheet, which seriously affects the capacity of the battery and the consistency between batteries.
At the same time, the above-mentioned formation method also has the problems of long formation time and large investment in equipment and labor.

Method used

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Embodiment Construction

[0010] Specific embodiments of the present invention are described in detail.

[0011] The formation method of lithium ion battery of the present invention, carries out the following steps under the environment of -20~45 ℃:

[0012] (1) Charge the lithium-ion battery with a constant current at a rate of 0.05-0.2 for 3-5 hours, and set the cut-off voltage at 3.0-4.0 volts. After charging, gas will be generated inside the battery;

[0013] (2) The battery is removed from the machine to carry out the vacuum sealing process to remove the gas generated during the internal formation process of the battery, so as to ensure that the battery pole piece will not produce lithium overcharge;

[0014] (3) Then charge the lithium-ion battery with a constant current of 0.2-30 times, and set the cut-off voltage at 3.0-4.0 volts; continuing to form can ensure the formation of the SEI film of the battery is stable, and improve the battery capacity, that is, the cycle performance.

[0015] (4) ...

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Abstract

The invention discloses a formation method for a lithium ion battery. Over-charging is avoided, and the low capacity ratio of the battery can be lowered. In an environment of -20 to 45 DEG C, the method comprises the following steps of: performing 0.05 to 0.2-time constant current charging on the lithium ion battery for 3 to 5 hours, and setting cutoff voltage to be 3.0 to 4.0 volts, wherein a gas can be generated in the battery after the charging is finished; disassembling the battery, and performing a vacuumizing packaging procedure to exhaust the gas generated by the internal formation process of the battery; performing 0.2 to 30-time constant current charging on the lithium ion battery, and setting the cutoff voltage to be 3.0 to 4.0 volts; and performing constant voltage charging on the lithium ion battery, and setting cutoff current to be 0.001 to 0.02 time. The method has the advantages that local over-charging is prevented, the low capacity ratio of the battery can be remarkably lowered, and the consistency of the battery can be improved.

Description

technical field [0001] The invention relates to a lithium ion battery formation method. Background technique [0002] At present, the formation method of lithium-ion batteries is as follows: the battery soaked by liquid injection is charged with a small current and a constant current of 0.01 to 0.04 times, and the charging time is 0.5 to 5 hours, and then charged with a large current and a constant current of 0.05 to 2 times. After the voltage is 3.65-4.5 volts, let the battery enter the constant voltage charging stage. The voltage is kept between 3.65-4.5 volts. When the charging current is reduced to 0.001-0.02 times, stop charging and the formation is over. The battery using the above-mentioned formation method has serious formation and gas production, and is prone to partial overcharging, resulting in electrolyte decomposition and defects such as mottling and lithium precipitation on the surface of the negative electrode sheet, which seriously affects the capacity of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058H01M10/44
CPCY02E60/12Y02E60/10Y02P70/50
Inventor 吴军殷东王健向玉枝
Owner JIANGSU LITIAN NEW ENERGY TECH
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