Stable capacity calibration method for long-time stored retired lithium battery

Abstract

The invention belongs to the technical field of storage batteries, and provides a stable capacity calibration method for a long-time stored retired lithium battery. The method comprises the steps: carrying out the activation processing of a battery cell at a small multiplying power after the appearance inspection and information collection of a long-time stored retired lithium battery cell; carrying out the room temperature capacity testing; collecting the capacity Q data and voltage V data in a room temperature capacity testing process, and drawing a charging capacity increment curve dQ / dV-Vmap; solving the difference of X-axis coordinate data corresponding to a peak value of the capacity increment curve in a former and latter testing process through combining with the charging capacityincrement curve, and determining whether the capacity value in the testing process is the stable value of the retired battery or not in a testing process according to the difference. The method solvesa problem that a conventional battery capacity calibration method is not accurate in the calibration of the capacity of the long-time stored retired lithium battery, and lays an application foundation for the safe and reliable stepped reuse of a subsequent retired battery.

Description

technical field [0001] The invention belongs to the technical field of accumulators, and in particular relates to a method for calibrating the stable capacity value of decommissioned lithium batteries stored for a long time. Background technique [0002] Environmental pollution and energy depletion are two major problems facing mankind. In order to cope with the dual pressure of environment and energy, countries all over the world regard the development and utilization of new energy as an important strategy for sustainable development. In recent years, most countries in the world have regarded the development of electric vehicles as an important way to save energy and reduce emissions. [0003] The power battery is one of the core components of the electric vehicle, and the performance index of the power battery directly affects the overall performance of the electric vehicle. In order to ensure the driving and safety performance of electric vehicles, when the electric vehi...

AI Technical Summary

Problems solved by technology

However, the health status of each decommissioned single lithium battery and the storage time and storage environment of decommissioned lithium batteries are different, resulting in different health recovery status and recovery time of lithium batteries.

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