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Formation and capacity-grading method for lithium battery

A lithium battery and capacity-division technology, applied in secondary batteries, electrochemical generators, secondary battery charging/discharging, etc. The effect of improving the pass rate and electrical performance consistency and improving the pass rate

Active Publication Date: 2019-11-12
LINKDATA NEW ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Lithium-ion batteries, especially power batteries used in new energy vehicles, have high requirements for the consistency of batteries in groups. In recent years, electric vehicles have caught fire and spontaneously ignited during driving and charging, mostly due to the consistency of batteries in the battery pack. The problem is that a single battery has been in the state of "overcharge" and "overdischarge" for a long time during use.
The common Li-ion battery composition capacity only selects the capacity, internal resistance, and voltage of the battery after the battery capacity division is completed. There is a large gap in the selection method of the capacity and voltage, and the consistency of the battery core is difficult to be guaranteed.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054]The lithium battery is precharged, aged at room temperature, formed, aged at high temperature, K value test, capacity divided and sorted sequentially. The precharge steps are:

[0055] (1) Put the assembled battery on hold for 3 minutes at a temperature of 22-28°C;

[0056] (2) Charge the battery with a constant current of 0.5C for 4 minutes;

[0057] (3) Perform the first OCV test on the battery cell after charging, and the battery voltage range after precharging is required to be 2.0-2.2V.

[0058] For the normal temperature aging, the temperature is 22-28° C., and the aging time is 48 hours.

[0059] Described conversion step is:

[0060] (1) Charge the battery that has been aged at room temperature at a constant current of 0.1C for 120 minutes, and the upper limit of the charging voltage is 3.6V, and put the battery on hold for 8 minutes;

[0061] (2) Charge the charged battery with a constant current at 0.5C for 105 minutes, the upper limit of the charging voltag...

Embodiment 2

[0076] The lithium battery is precharged, aged at room temperature, formed, aged at high temperature, K value test, capacity divided and sorted sequentially. The precharge steps are:

[0077] (1) Put the assembled battery on hold for 5 minutes at a temperature of 22-28°C;

[0078] (2) Charge the battery with a constant current of 0.3C for 10 minutes;

[0079] (3) Perform the first OCV test on the battery cell after charging, and the battery voltage range after pre-charging is required to be 2.2-2.5V.

[0080] For the normal temperature aging, the temperature is 22-28° C., and the aging time is 24 hours.

[0081] Described conversion step is:

[0082] (1) Charge the battery that has been aged at room temperature at a constant current of 0.2C for 60 minutes, and the upper limit of the charging voltage is 3.6V, and put the battery on hold for 5 minutes;

[0083] (2) Charge the charged battery with a constant current at 0.33C for 160 minutes, and the upper limit of the charging...

Embodiment 3

[0098] The lithium battery is precharged, aged at room temperature, formed, aged at high temperature, K value test, capacity divided and sorted sequentially. The precharge steps are:

[0099] (1) Put the assembled battery on hold for 4 minutes at a temperature of 22-28°C;

[0100] (2) Charge the battery at a constant current of 0.8C for 2 minutes;

[0101] (3) Perform the first OCV test on the battery cell after charging, and the battery voltage range after pre-charging is required to be 1.8-2.0V.

[0102] For the normal temperature aging, the temperature is 22-28° C., and the aging time is 72 hours.

[0103] Described conversion step is:

[0104] (1) Charge the battery that has been aged at room temperature at a constant current of 0.3C for 50 minutes, and the upper limit of the charging voltage is 3.7V, and put the battery on hold for 10 minutes;

[0105] (2) Charge the charged battery with a constant current at 0.6C for 90 minutes, and the upper limit of the charging vol...

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Abstract

The invention discloses a formation and capacity-grading method for a lithium battery. The method comprises the processes of precharging, normal temperature ageing, formation, high temperature ageing,K value testing, capacity grading and sorting, wherein open-circuit voltage (OCV) detection is carried out in the processes of precharging, formation, K value testing, capacity grading and sorting. The formation and capacity-grading method is convenient to operate; the qualified rate of delivered products can be greatly improved; and the formation and capacity-grading method is suitable for practical production.

Description

technical field [0001] The invention relates to a composition and volume method for lithium batteries. Background technique [0002] Lithium-ion batteries, especially power batteries used in new energy vehicles, have high requirements for the consistency of batteries in groups. In recent years, electric vehicles have caught fire and spontaneously ignited during driving and charging, mostly due to the consistency of batteries in the battery pack. The problem is caused by the long-term "overcharge" and "overdischarge" state of a single battery during use. The common Li-ion battery composition capacity only selects the capacity, internal resistance, and voltage of the battery after the battery capacity division is completed. There is a large gap in the selection method of the specific capacity and voltage, and the consistency of the battery cell is difficult to be guaranteed. Contents of the invention [0003] The invention relates to a chemical composition and volume metho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/44
CPCH01M10/446Y02E60/10
Inventor 杨六香蒋濛王进夏咸兵
Owner LINKDATA NEW ENERGY CO LTD
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