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Liquid supplement method for cascaded utilization soft package lithium battery cell

A liquid replenishment method and lithium battery technology, applied in the direction of secondary batteries, circuits, electrical components, etc., can solve the problems of reducing the service life of power batteries, reducing the use value of power batteries, and reducing cycle life, so as to improve circulation and alleviate The effect of reducing the capacity of the battery cell and reducing the internal resistance

Inactive Publication Date: 2017-12-12
桑顿新能源科技(长沙)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Problems existing in the existing technology: under the current technical conditions, though preliminary detection, screening, and then classification and utilization can realize cascade utilization of power batteries; but many power batteries with good appearance and no damage are due to excessive capacity caused by electrolyte consumption. Low, internal resistance increases, and cycle life decreases. If it is simply used in stages according to capacity and internal resistance, the utilization value of the power battery will be greatly reduced, and the life of the cascade utilization of the power battery will be reduced.

Method used

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  • Liquid supplement method for cascaded utilization soft package lithium battery cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Such as figure 1 As shown, the decommissioned soft-packed power cell 3 is initially screened, the soft-packed power cell 3 with abnormal appearance is eliminated, and the soft-packed power cell 3 with qualified appearance is cyclically tested, and the capacity retention is high and the resistance is normal. The packaged power cell 3 is directly reused; the soft packaged power cell 3 with lower capacity and larger internal resistance is picked out for use; the decommissioned soft packaged power cell 3 has no requirements for size, and the retired soft packaged power cell The core 3 is the ternary cell 3. The soft-packed power cell 3 with lower capacity and larger internal resistance to be used is discharged to 2.5V, and then placed in a glove box with a dew point lower than -45℃, gloves The dew point in the box is controlled by the online dew point tester and the dehumidifier air supply dew point adjustment, and the electrolyte is refilled into the soft pack power cell 3 ...

Embodiment 2

[0030] Such as figure 1 As shown, the decommissioned soft-packed power cell 3 is initially screened, the soft-packed power cell 3 with abnormal appearance is eliminated, and the soft-packed power cell 3 with qualified appearance is cyclically tested, and the capacity retention is high and the resistance is normal. The packaged power cell 3 is directly reused; the soft packaged power cell 3 with lower capacity and large internal resistance is picked out for use; the decommissioned soft packaged power cell 3 has no requirements for size, and the retired soft packaged power cell The core 3 is a lithium iron phosphate battery 3. The soft-packed power battery 3 with lower capacity and larger internal resistance to be used is discharged to 2.5V, and then placed in a glove box with a dew point lower than -45°C. The dew point in the box is controlled by the online dew point tester and the dehumidifier air supply dew point adjustment, and the electrolyte is refilled into the soft pack p...

Embodiment 3

[0032] Such as figure 1 As shown, the decommissioned soft-packed power cell 3 is initially screened, the soft-packed power cell 3 with abnormal appearance is eliminated, and the soft-packed power cell 3 with qualified appearance is cyclically tested, and the capacity retention is high and the resistance is normal. The packaged power cell 3 is directly reused; the soft packaged power cell 3 with lower capacity and large internal resistance is picked out for use; the decommissioned soft packaged power cell 3 has no requirements for size, and the retired soft packaged power cell The core 3 is a lithium titanate battery 3. The soft-packed power battery 3 with lower capacity and larger internal resistance to be used is discharged to 2.5V, and then placed in a glove box with a dew point lower than -45℃. The dew point in the box is controlled by the online dew point tester and the dehumidifier air supply dew point adjustment. The electrolyte is refilled into the soft pack power cell 3...

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Abstract

The invention discloses a liquid supplement method for a cascaded utilization soft package lithium battery cell. The liquid supplement method comprises the steps of initially screening a retired soft package power battery cell; removing the battery cell with abnormal appearance, and reserving the battery cell with favorable appearance, excessive low capacity, large internal resistance and high voltage; and discharging a battery cell to be liquid-supplemented to 2.5V, placing the battery cell in a glove box with a dew point lower than -45 DEG C, supplementing an electrolyte to the battery cell by an injector, sealing by a packaging machine, and checking a package effect to obtain the battery cell after being liquid-supplemented. By the method, liquid is supplemented on the condition that a battery cell main body is not disassembled; and by the method, the problems of low capacity, cycle bubbles, large internal resistance, high voltage and the like of the battery cell caused by decomposition of the electrolyte and a small amount of electrolyte can be effectively solved, and the cascaded utilization ratio of the soft package lithium power battery is improved.

Description

Technical field [0001] The invention belongs to a method for implementing refilling without disassembling a soft-packed decommissioned power battery, and specifically relates to a method for refilling with soft-packed lithium battery cells in cascades. Background technique [0002] With the rapid promotion of new energy vehicles, market ownership continues to grow, and more and more new energy vehicle aftermarket problems have become increasingly prominent. Among them, the most pressing issue will be the recycling of new energy vehicle power batteries. Do a good job in the recovery of power batteries. It is not only related to the real green and environmental development of new energy vehicles, but also the key to the recycling of metal resources such as lithium and cobalt. According to relevant statistics, global sales of new energy vehicles reached 921,000 in 2016, a year-on-year increase of 55.2%. Among them, China is the world’s largest market for new energy vehicles, but in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/36H01M10/0525H01M50/609
CPCH01M10/0525H01M50/60Y02E60/10
Inventor 吕荣刘璋勇肖资吴强谷杨李海波胡泽林文一波
Owner 桑顿新能源科技(长沙)有限公司
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