Activation method of cascaded utilization power battery

Abstract

The invention discloses an activation method of a cascaded utilization power battery. The activation 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; and discharging a battery cell to be activated to 2.5V or 2.0V, charging the battery cell with 0.05C in an environment of 20-40 DEG C, correspondingly discharging the battery cell to 0.05C-2.5V or 2.0V, circulating for 3 periods, charging the battery cell with 0.1C, correspondingly discharging the battery cell to 0.1C-2.5V or 2.0V, circulating for 3 periods, discharging the battery cell by about 10% until SOC is 90%, stopping circulating, placing the battery cell in an environment of 45 DEG C, and allowing the battery cell to stand for 24 hours. By the method, the battery cell is activated by different charge-discharge processes and by standing at 45 DEG C on the condition that the battery cell is not disassembled; and by the method, the problem of low capacity, large internal resistance and the like of the battery cell caused by polarization and partial active lithium deposition can be effectively solved, and the cascaded utilization ratio of the power battery is improved.

Description

technical field [0001] The invention belongs to an implementation method for reactivation of decommissioned power batteries without dismantling, in particular to a method for activating power batteries in cascade utilization. Background technique [0002] With the rapid promotion of new energy vehicles, the market share continues to grow, and more and more problems in the aftermarket of new energy vehicles have become increasingly prominent. The most urgent issue will be the recycling of power batteries for new energy vehicles. Do a good job in the recycling of power batteries Not only is it related to the development of new energy vehicles that are truly green and environmentally friendly, but it is also the key to the recycling and reuse of metal resources such as lithium and cobalt. According to relevant statistics, in 2016, the global sales of new energy vehicles reached 921,000 units, a year-on-year increase of 55.2%. Among them, China is the largest market for new ene...

AI Technical Summary

Problems solved by technology

[0004] Problems existing in the existing technology: under the current technical conditions, though preliminary testing, screening, and then classification and utilization can realize cascaded utilization of power batteries; but the capacity of 60%-80% power batteries with good appearance and no damage is a lot Part of it is due to the increase in the internal polarization of the battery cell and the deposition of some lithium ions, resulting in low capacity, increased internal resistance, and reduced cycle life. If the battery is used only according to the capacity and internal resistance, the utilization value of the power battery will be greatly reduced, and It will reduce the service life of the cascade utilization of the power battery