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Formation and capacity separation method of a lithium ion battery

A lithium-ion battery and charging capacity technology, which is applied in the field of chemical composition and capacity of lithium-ion batteries, can solve problems such as complex processes, and achieve the effect of reducing equipment investment and power consumption

Active Publication Date: 2022-04-19
DYNABAT NEW ENERGY SCI & TECH CO CLD FUJIAN
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  • Claims
  • Application Information

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  • Formation and capacity separation method of a lithium ion battery
  • Formation and capacity separation method of a lithium ion battery
  • Formation and capacity separation method of a lithium ion battery

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Embodiment Construction

[0024] The present invention will be further described below through specific examples.

[0025] A method for formation and capacity separation of a lithium-ion battery, comprising the following steps:

[0026] 1) Take 18 lithium-ion batteries after filling the electrolyte; in the present embodiment, the lithium batteries are 18650 type cylindrical lithium-ion batteries with a design capacity of 2200mAh;

[0027] 2) putting the n lithium-ion batteries on hold for 24 hours;

[0028] 3) Charge it with a current of 0.05C, and the charging time is 2 hours;

[0029] 4) Shelve the charged lithium-ion battery at 45° and age it for 48 hours;

[0030] 5) Charge the lithium-ion battery to the rated voltage with a current of 0.5C, switch to constant voltage charging, and end charging after the cut-off current;

[0031] 6) Put the lithium-ion battery aside for 10 minutes after charging;

[0032] 7) Divide the 18 lithium-ion batteries into 3 lithium-ion battery packs on average, and di...

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Abstract

The invention provides a lithium ion battery formation and capacity separation method, comprising the following steps: 1) charging the lithium ion with a small flow current for 2 to 3 hours; 2) charging the charged lithium ion battery at a certain temperature Shelving and aging; 3) Charge the lithium-ion battery to the rated voltage with a medium-flow current, switch to constant voltage charging, and stop charging after the cut-off current; 4) Put the lithium-ion battery on hold for 5-30 minutes after charging; 5 ) Discharge the lithium-ion battery to the cut-off voltage with different discharge rates; divide the discharge capacity by the charge capacity to obtain the first charge efficiency of each lithium-ion battery at the discharge rate, thereby obtaining the lithium-ion battery at the discharge rate The average initial charge efficiency; thus by calculation, the capacity of the mass-produced lithium-ion battery at different discharge rates = the average initial charge efficiency of the mass-produced lithium-ion battery charge capacity x different discharge rates, the compositional capacity Finish.

Description

technical field [0001] The invention relates to the technical field of manufacturing lithium ion batteries, in particular to a chemical composition and capacity method for lithium ion batteries. Background technique [0002] Lithium-ion batteries are green, high-energy and environmentally friendly batteries that appeared in the 1990s. They have outstanding advantages such as high energy density, environmental friendliness, no memory effect, long cycle life, and less self-discharge. They are not only used in mobile phones, notebook computers, and portable measuring instruments. It is an ideal power source for small and lightweight electronic devices, and it is also an energy storage battery for electric vehicles, electric bicycle power sources, wind energy, and solar energy that are currently being industrialized. It mainly relies on the intercalation and deintercalation of lithium ions at the positive and negative electrodes to work. During the charging process, Li+ is dein...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/058H01M10/44
CPCH01M10/058H01M10/446Y02E60/10Y02P70/50
Inventor 庄大高张伦文李青海
Owner DYNABAT NEW ENERGY SCI & TECH CO CLD FUJIAN