Formation and capacity grading method of 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: 2017-08-01
DYNABAT NEW ENERGY SCI & TECH CO CLD FUJIAN
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[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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The invention provides a formation and capacity grading method of a lithium ion battery. The formation and capacity grading method comprises the following steps of 1) charging the lithium ion battery for 2-3 hours with a current in small flow; 2) allowing the charged lithium ion battery to stand and age at a certain temperature; 3) charging the lithium ion battery to rated voltage with a current in middle flow, forwarding to charge with constant voltage, and ending charging after a cutoff current is reached; 4) allowing the lithium ion battery after charging is completed to stand for 5-30 minutes; and 5) discharging the lithium ion battery with different discharge rates to a cutoff voltage, dividing discharge capacity by charge capacity to obtain initial charge efficiency of each lithium ion battery under the discharge rate so that the average initial charge efficiency of the lithium ion battery under the discharge rate is obtained, the capacity of the lithium ion batteries in mass production under different discharge rates is equal to a product of the charge capacity of the lithium ion batteries in mass production and the average initial charge efficiency under different discharge rates, and the formation and capacity grading are completed.
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...
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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