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Method for repairing performance of retired lithium ion battery

A lithium-ion battery and performance technology, which is applied in the field of repairing the performance of decommissioned lithium-ion batteries, can solve the problems of insufficient improvement in battery cycle life and service performance, insufficient uniformity, and compactness, and achieve good battery consistency, battery capacity and Improved cycle performance and extended life

Inactive Publication Date: 2019-07-16
SHENZHEN PANDPOWER CO LTD
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Existing lithium-ion battery repair methods usually result in uneven and dense repair of the SEI (Solid Electrolyte Interface) film on the surface of the damaged negative electrode of the old battery, so the effect of improving the cycle life and service performance of the battery is not good enough

Method used

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  • Method for repairing performance of retired lithium ion battery
  • Method for repairing performance of retired lithium ion battery

Examples

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Effect test

Embodiment 7

[0043] Example 7: After sample F was used, the battery was discharged to 2.75V at a constant current of 21A, and the battery capacity C0 decayed to 29Ah, which was 69.0% of the initial rated capacity C (42Ah). Then, in a constant 45°C aging room, the battery was charged at a constant current and constant voltage of 8.4A (0.2C) for 500 minutes, the cut-off current was 0.84A, and the charging upper limit voltage was 4.2V; then, in an aging room at the same temperature, Discharge at a constant current of 8.4A (0.2C) to 2.75V; repeat this, charge and discharge cycle 3 times, and the repair is complete.

[0044] In a normal temperature environment, charge the repaired battery to 4.2V with a constant current of 21A and a cut-off current of 0.84A, and then discharge it to 2.75V with a constant current of 21A. The discharge capacity C1 of the battery is 39Ah, and the capacity C1 recovers to 92.9% of the initial rated capacity C after restoration, which is an increase of 23.9%. For th...

Embodiment 8

[0046] Example 8: After sample L was used, the battery was discharged to 2.75V at a constant current of 1.3A, and the battery capacity C0 decayed to 1.8Ah, which was 69.2% of the initial rated capacity C (2.6Ah). Then, in a constant 45°C aging room, the battery is charged at a constant current and constant voltage of 0.52A (0.2C) for 500 minutes, the cut-off current is 0.052A, and the charging upper limit voltage is 4.2V; then, in an aging room at the same temperature, Discharge at a constant current of 0.52A (0.2C) to 2.75V; repeat this, charge and discharge cycle 3 times, and the repair is complete.

[0047] In a normal temperature environment, charge the repaired battery to 4.2V with a constant current of 1.3A and a cut-off current of 0.052A, and then discharge it to 2.75V with a constant current of 1.3A. The discharge capacity C1 of the battery is 2.4Ah, and the capacity recovers to 92.3% of the initial rated capacity C after restoration, an increase of 23.1%. For the com...

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Abstract

The invention discloses a method for repairing performance of a retired lithium ion battery, and relates to the technical field of battery performance repair methods; the method comprises the following steps of firstly, carrying out discharging on a single retired battery to a lower limit voltage state at a normal temperature environment; then, at a temperature of 25-60 DEG C, performing constantcurrent constant voltage charging on the single retired battery from the lower limit voltage state to an upper limit voltage state; finally, at a temperature of 25-60 DEG C, performing constant current discharging on the single retired battery from the upper limit voltage state to the lower limit voltage state; and repeating the charging and discharging processes for 2-5 times. By adopting the method disclosed by the invention, the discharge capacity of the repaired battery is increased by 20% or above compared with that before repairing, the performance of the retired lithium ion battery is improved, and the service life of the retired battery is prolonged.

Description

technical field [0001] The invention relates to the technical field of battery performance repair methods, in particular to a method for repairing the performance of decommissioned lithium-ion batteries. Background technique [0002] In recent years, with the rapid development of the electric vehicle industry, the power battery industry is also actively expanding. Behind the expansion has also brought an increasingly prominent problem-how to recycle decommissioned power batteries? Lithium-ion battery technology has become one of the key technologies in electric vehicle systems. During the use of power lithium-ion batteries, battery life and cost are two key factors restricting the development of electric vehicles. In 2016, the sales volume of electric vehicles in China reached 517,000, and the market sales volume in 2017 is expected to be about 700,000. Calculated based on the 5-year service life of power batteries, according to the forecast of China Automotive Technology an...

Claims

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Application Information

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IPC IPC(8): H01M10/44H01M10/54
CPCH01M10/446H01M10/448H01M10/54Y02E60/10Y02W30/84
Inventor 刘晨露刘航刘卫强吴晓凤李昌坤罗勇黄玲张涵
Owner SHENZHEN PANDPOWER CO LTD
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