A kind of capacity division method of high-voltage lithium-ion battery

A lithium-ion battery and capacity-division technology, which is applied in secondary batteries, electrolyte battery manufacturing, non-aqueous electrolyte batteries, etc., to achieve the effects of eliminating insufficient power supply, stable voltage and slow decay.

Active Publication Date: 2019-06-18
珠海汉格能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the deficiencies in the prior art, the object of the present invention is to provide a method for capacity division of high-voltage lithium-ion batteries. The battery voltage of the lithium-ion battery treated by the capacitance method can still reach above 4.18V after aging.

Method used

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  • A kind of capacity division method of high-voltage lithium-ion battery

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Embodiment 1

[0026] A kind of capacity dividing method of high-voltage lithium-ion battery, its concrete steps are as follows:

[0027] a. The first charging stage: take the formed battery, charge it to 4.2V with a current of 0.5C constant current and constant voltage, the cut-off current is 0.02C, the time limit is 130min, and stand for 5min;

[0028] b. Discharge stage: Discharge to 3.0V at a constant current of 0.5C, the time limit is 130min, and stand for 5min;

[0029] c. The second charging stage: charge to 4.2V with a current of 0.5C constant current and constant voltage, the cut-off current is 0.02C, the time limit is 200min, and stand for 60min;

[0030] d. The third charging stage: first charge to 4.21V with a current of 0.5C constant current and constant voltage, the cut-off current is 0.02C, the time limit is 60min, and stand for 60min; then charge to 4.22V with a current of 0.5C constant current and constant voltage V, the cut-off current is 0.02C, the time limit is 60min, an...

Embodiment 2

[0033] A kind of capacity dividing method of high-voltage lithium-ion battery, its concrete steps are as follows:

[0034] a. The first charging stage: take the formed battery, charge it to 4.0V with a current of 0.05C constant current and constant voltage, the cut-off current is 0.02C, the time limit is 150min, and stand for 5min;

[0035] b. Discharge stage: discharge to 3.0V at a constant current of 0.05C, the time limit is 150min, and stand for 5min;

[0036] c. The second charging stage: charge to 4.2V with a current of 1.0C constant current and constant voltage, the cut-off current is 0.02C, the time limit is 180min, and stand for 60min;

[0037] d. The third charging stage: first charge to 4.21V with a current of 0.05C constant current and constant voltage, the cut-off current is 0.02C, the time limit is 120min, and stand for 60min; then charge to 4.22V with a current of 0.5C constant current and constant voltage V, the cut-off current is 0.02C, the time limit is 60min...

Embodiment 3

[0040] A kind of capacity dividing method of high-voltage lithium-ion battery, its concrete steps are as follows:

[0041] a. The first charging stage: take the formed battery, charge it to 4.2V with a current of 0.05C constant current and constant voltage, the cut-off current is 0.02C, the time limit is 150min, and stand for 5min;

[0042] b. Discharge stage: discharge to 3.0V at a constant current of 0.05C, the time limit is 180min, and stand for 5min;

[0043] c. The second charging stage: charge to 4.2V with a current of 0.5C constant current and constant voltage, the cut-off current is 0.02C, the time limit is 200min, and stand for 60min;

[0044]d. The third charging stage: first charge to 4.21V with a current of 0.05C constant current and constant voltage, the cut-off current is 0.02C, the time limit is 120min, and stand for 60min; V, the cut-off current is 0.02C, the time limit is 120min, and the time is limited to 60min; first charge to 4.23V with a current of 0.5C c...

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Abstract

The invention discloses a method for dividing the capacity of a high-voltage lithium ion battery, which belongs to the technical field of lithium ion battery production. The capacity dividing method of the present invention includes the first charging stage, the discharging stage, the second charging stage and the third charging stage in sequence, wherein the charging current of the first charging stage is 0.02-0.5C, and the cut-off voltage is 4.0-4.2 V, the charging current of the second charging stage is 0.5-1.0C, the cut-off voltage is 4.0-4.2V, the charging current of the third charging stage is 0.02-0.5C, and the cut-off voltage is 4.21-4.23V. This method is relatively simple, and can eliminate the insufficient power supply caused by the poor contact of the contacts of the capacity division cabinet. The lithium ion battery treated by the capacity division method can still reach a battery voltage above 4.18V after aging.

Description

technical field [0001] The invention relates to the technical field of manufacturing lithium-ion batteries, in particular to a method for dividing the capacity of high-voltage lithium-ion batteries. Background technique [0002] As an important part of the new energy field, lithium-ion batteries have become a new hotspot in global economic development. Compared with traditional lead-acid batteries, nickel-metal hydride and nickel-cadmium batteries, lithium-ion batteries have higher specific capacity and longer cycle life. Long, good safety performance, friendly to the environment, has gradually replaced lead-acid batteries and nickel metal hydride, nickel cadmium and other batteries, widely used in mobile phones, notebooks and electric vehicles, etc., with the rapid development of these industries, lithium-ion batteries Production and demand will also increase day by day, with a broad market space. During the manufacturing process of existing lithium-ion batteries, the fini...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/058H01M10/44H01M10/0525
CPCH01M10/0525H01M10/058H01M10/44Y02E60/10Y02P70/50
Inventor 胡常青吴倩明
Owner 珠海汉格能源科技有限公司
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