Lithium secondary battery consistency screening method

A technology of lithium secondary battery and screening method, applied in the direction of climate sustainability, sustainable manufacturing/processing, final product manufacturing, etc. Good market application prospect and small hidden danger of self-power consumption

Active Publication Date: 2013-01-09
GUANGZHOU FULLRIVER BATTERY NEW TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The second defect of this method is that it can only give the self-consumption judgment standard of the battery under the condition of a fixed storage time, and it is difficult to manage the reliability of the stock battery in the production process and meet the requirements of different production delivery dates

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment １

[0029] Example 1: The 9585175Fe lithium iron phosphate lithium-ion battery produced by our company has a nominal voltage of 3.2V and a rated capacity of 12Ah. According to the production and delivery requirements, the time from the completion of charging to the packaging of a single battery is 7 days.

[0030] According to the method of the present invention, after the single battery is formed into capacity, the selected capacity grade is 12.6~12.8Ah, 0.5 C 5 Discharge single battery with 3.0V platform ≥ 100 minutes, internal resistance ≤ 6mΩ, select V 0 3.15V, using 0.3 C 5 Constant current charging to 3.15V, and then constant voltage to 3.15V for constant voltage charging, when the charging current is 0.1 C 5 Stop charging and turn to shelve; continue to charge at 0.1 C after 10 minutes of shelving 5 Constant current charging to 3.15V, and then constant voltage to 3.15V for constant voltage charging, when the charging current is 0.05 C 5 Stop charging and turn to shelve; ...

Embodiment ２

[0040] Example 2: The 11585135Fe lithium iron phosphate lithium-ion battery produced by our company has a nominal voltage of 3.2V and a rated capacity of 10Ah. According to the production and delivery requirements, the time from the completion of charging to the packaging of a single battery is 10 days.

[0041] According to the method of the present invention, after the capacity of the single battery is completed, the selected capacity grade is 10.6~10.7Ah, 0.5 C 5 Discharge single battery with 3.0V platform ≥ 100 minutes, internal resistance ≤ 7mΩ, use 0.1C 5 Constant current charge to voltage V 0 is 3.15V, and then the constant voltage is 3.15V for constant voltage charging, when the charging current is 0.01 C 5 Charging is stopped at this time, and then the single battery is left at room temperature for 10 days, then the open circuit voltage of the battery is measured, and the single battery with large self-consumption is eliminated.

[0042] According to the method of t...

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Abstract

The invention discloses a lithium secondary battery consistency screening method, belonging to the field of secondary batteries, characterized in that: a unit battery grades the capacity, platform, and internal resistance when conducting capacity grading and detection, and then the unit battery is charged by multi-step constant current and constant voltage, wherein a constant current of 0.3-5C5 is used for charging to a voltage V0, when the charging current is 0.1-0.3 C5, the charge is stopped and the battery is shelved; after the battery is shelved for 5-30 min, the charging is continued with a constant current of 0.1-0.3 C5 to the voltage V0, when the charging current is 0.05-0.1 C5, the charge is stopped and the battery is shelved; after the battery is shelved for 5-30 min, the charging is continued with a constant current of 0.05-0.1 C5 to the voltage V0, when the charging current is 0.03-0.05 C5, the charge is stopped and the battery is shelved; after the battery is shelved for 5-30 min, the charging is continued with a constant current of 0.03-0.05 C5 to the voltage V0, when the charging current is 0.01-0.03 C5, the charge is stopped; after the charging is complete, the unit battery is shelved at a normal temperature, the shelving time is no less than 24h, when the shelving ends, measurement is carried out on the open-circuit voltage Vt of the unit battery, if the open-circuit voltage Vt is no less than the result of V0 minus delta V0 and minus n*delta V, the unit battery is qualified. According to the invention, the qualified unit battery screened by the invention has low self-consuming hazards, the combined battery pack has good self-discharge consistency, high reliability, and rapidness, simpleness and easy operation in practical application, and has a good market application prospect.

Description

technical field [0001] The invention relates to a lithium secondary battery consistency screening method, which belongs to the field of secondary batteries, and in particular relates to a single battery consistency screening method of a lithium ion battery pack. Background technique [0002] With the rapid development of lithium-ion batteries, lithium-ion batteries have also begun to be widely used as power and energy storage power sources. Compared with small mobile electrical equipment such as mobile phones, power and energy storage batteries require high energy storage power output and long service life, which requires batteries to be combined in multiple parallels and multiple strings. The price of the battery pack is high and the value is high. , therefore, higher requirements are placed on battery reliability and consistency. The functional failure of any single battery in the battery pack will lead to the functional failure of the entire battery pack, and even lead t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B07C5/344
CPCY02E60/10Y02P70/50
Inventor 唐胜成成定波曾石华张常勇邱德铭
Owner GUANGZHOU FULLRIVER BATTERY NEW TECH
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