HIGH-EFFICIENCY GRADING METHOD AND SYSTEM FOR LITHIUM-ION CELLS, AND STORAGE MEDIUM

The provided is a high-efficiency grading method and system for lithium-ion cells, and a storage medium. The provided aims to solve the problem of excessively long capacity grading time for lithium-ion cells. The high-efficiency grading method includes: obtaining discharge capacities C, discharge endpoint voltages V, rebound voltages V, and remaining capacities Cof lithium-ion cells; subjecting data of the obtained discharge capacities Cor discharge endpoint voltages Vto slicing and classification processing; plotting a scatter plot of the remaining capacities Cagainst the rebound voltages Vaccording to the remaining capacities Cand corresponding rebound voltages Vof the lithium-ion cells, performing curve fitting, and deriving remaining capacity prediction model equations; and calculating full discharge capacities of a new batch of lithium-ion cells. The provided omits the full discharge step in the conventional grading process, greatly shortening the capacity grading time and improving production efficiency.