Battery energy storage applicability detection and evaluation method, system and device and storage medium

Abstract

The invention discloses a battery energy storage applicability detection and evaluation method, system and device and a storage medium. The method comprises the steps: dividing the SOC full interval of a standard ternary power battery into a plurality of interval segments, carrying out the AC impedance spectrum test in each interval segment, and extracting the charge transfer resistance and diffusion impedance of the standard ternary power battery under different SOCs; extracting charge transfer resistance and diffusion impedance of the retired ternary power battery under different SOCs; and evaluating the energy storage applicability of the retired battery according to the average value of the ratio of the charge transfer resistance of the retired ternary power battery to the charge transfer resistance of the standard ternary power battery under different SOCs and the average value of the ratio of the diffusion impedance of the retired ternary power battery to the diffusion impedanceof the standard ternary power battery under different SOCs. Due to the fact that the dynamic electrochemical impedance of the battery is measured, characteristic parameters of the battery in differentcharge states in the normal charging and discharging process can be truly reflected, and the applicability of the retired battery in the energy storage working condition can be evaluated more objectively and truly.

Description

technical field [0001] The invention relates to the field of detection and evaluation of lithium-ion batteries, in particular to a detection and evaluation method, system, equipment and storage medium for the applicability of battery energy storage. Background technique [0002] The ternary lithium-ion battery has the advantages of high energy density and high voltage platform, and is an important source of power for electric vehicles. In recent years, due to the rapid development of ternary lithium-ion battery technology, the energy density has continued to increase, and the market share in power batteries has rapidly increased. The domestic power battery technology route has shifted from lithium iron phosphate batteries with low energy density to ternary lithium-ion batteries with high energy density. Gradually change. The average service life of power batteries is about 5 to 8 years. With the prolongation of battery life, the number of charge and discharge increases, and...

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Problems solved by technology

[0004] It can be seen that the existing methods for evaluating the applicability of ternary power battery energy storage have obvious disadvantages such as long time, heavy workload, and complicated operation process, and dismantling interrupts the charging and discharging reaction process of the battery, which cannot directly reflect the internal changes and The reaction mechanism has not realized the applicability evaluation of battery energy storage during battery charging and discharging or without destroying the battery

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