Lithium battery real-time sorting method, device and equipment and storage medium

Abstract

The invention discloses a lithium battery real-time sorting method, device and equipment and a storage medium, and the method comprises the steps: enabling a plurality of to-be-sorted batteries to becompletely discharged, and dividing an SOC interval of each battery into N interval segments; after all the batteries in each SOC interval section are charged, carrying out online measurement to obtain N dynamic impedance test values; based on the equivalent circuit model of the battery dynamic impedance and according to the N dynamic impedance test values, obtaining the charge transfer resistanceof the kth SOC interval section and the correlation coefficient rho of the characteristic parameter representing the Warburg diffusion impedance value of the kth SOC interval section; taking the batteries within the range of rho + / -delta lambda as similar batteries, and taking delta lambda as a preset error, so as to finish the online real-time sorting of the batteries. According to the battery sorting method adopted by the invention, the impedance of the battery can be tested on line and the characteristic parameters of the battery can be extracted under the condition of not damaging the battery and not influencing operation of the battery, so that the online real-time sorting of the battery is realized.

Description

technical field [0001] The invention belongs to the technical field of battery sorting, and relates to a real-time sorting method, device, equipment and storage medium for lithium batteries. Background technique [0002] Since the single lithium-ion battery energy storage technology has not reached the level of large capacity and super power, large-scale energy storage requires thousands of single lithium-ion batteries connected in series and parallel to form a battery pack to work, so energy storage The system often contains multiple battery packs, and the battery pack contains multiple battery cells. With the long-term charging and discharging cycle of the energy storage system, the parameters of the single battery will change, including the state of charge, internal resistance and available capacity, etc. The differences in these parameters between the single batteries will be This leads to overcharging and overdischarging of some single batteries during the charging and...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to propose a real-time sorting method, device, equipment and storage medium for lithium batteries based on the dynamic impedance of the battery, using the dynamic impedance of the battery as the basis for sorting the battery, and the dynamic impedance is based on the lithium ion battery generated during charging and discharging. The phenomenon of electrode polarization is different from the static impedance in which the electrode maintains a balanced potential in a static state, and overcomes the problem that the static impedance cannot accurately reflect the polarization of the battery due to charging and discharging.

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