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A step-by-step formation and consistency screening method for lithium-ion batteries

A lithium-ion battery and screening method technology, which is applied in the field of step-by-step formation and consistency screening of lithium-ion batteries, can solve the problems of long battery consistency screening cycle, unstable SEI film formation, etc., to improve the consistency screening effect and reduce The effect of improving the stability of the charging and discharging process

Active Publication Date: 2019-03-12
SHANDONG GOLDENCELL ELECTRONICS TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solve the problems of unstable SEI film formation and long battery consistency screening cycle

Method used

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  • A step-by-step formation and consistency screening method for lithium-ion batteries
  • A step-by-step formation and consistency screening method for lithium-ion batteries
  • A step-by-step formation and consistency screening method for lithium-ion batteries

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Effect test

Embodiment 1

[0028] Taking the cylindrical 18650-2.2Ah-3.6V battery as an example, the positive electrode material is nickel cobalt lithium manganese oxide, and the negative electrode material is graphite. Its step-by-step formation and consistency screening process is as follows:

[0029] The first step is pre-charging. After the battery is filled with liquid and sealed, it is left for 5 hours, and it is charged with a current of 0.05C for 1 hour.

[0030] The second step is to store at high temperature, first at 35°C for 36h, then at 45°C for 24h.

[0031] The third step is secondary charging, using 0.2C current to charge to 50% of the design capacity.

[0032] The fourth step is high temperature storage, the storage temperature is 40~45°C, and the storage time is 48h.

[0033] The fifth step is voltage internal resistance screening, and the battery is screened for voltage internal resistance. According to the characteristics of the battery voltage of the model =7mV, k=0.12 Calculat...

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Abstract

The invention relates to a lithium ion battery stepped formation and consistency screening method, which comprises the following steps of 1, pre-charging; 2, high-temperature standing; 3, second-time charging; 4, high-temperature standing; 5, voltage internal resistance screening; 6, third-time charging; 7, high-temperature standing; 8, discharging capacity screening; 9, high-temperature standing; 10, rebounding voltage screening test; 11, partial capacity group distribution. The formation process adopts three times of charging in different steps; in addition, corresponding temperature standing is performed after each time of charging, so that the infiltration of electrolyte is more thorough; the stability of an SEI film formed in the formation process is effectively improved; the battery circulation performance is improved. The discharging residue electricity quantity in the formation process is used for judging the self discharging condition of a battery; the conventional charging and discharging process is more accurately and efficiently reduced. The battery is screened through the rebounding voltage of the discharged battery, and the consistency screening effect is further improved.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and relates to a step-by-step formation and consistency screening method of lithium-ion batteries. Background technique [0002] At present, the mature lithium-ion battery system includes lithium iron phosphate battery, lithium manganate battery, nickel-cobalt lithium manganate battery, nickel-cobalt aluminum aluminate battery, etc., because lithium-ion batteries have high energy density, small self-discharge, and excellent cycle performance. Advantages, lithium-ion batteries are widely used in backup power supplies, energy storage devices, electric vehicles, electric bicycles, and electric tools. Usually, lithium-ion batteries need to be activated by initial charging, also known as formation. During the formation process, the battery is charged with a small current to form an SEI film on the negative electrode, thereby improving the battery's charge and discharge performance, cycle...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/44H01M10/0525
CPCH01M10/0525H01M10/446Y02E60/10
Inventor 李涛张敬捧周会李航关成善
Owner SHANDONG GOLDENCELL ELECTRONICS TECH
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