Capacity balance judgment method and device of battery system, equipment and medium

Abstract

The invention discloses a capacity balance judgment method and device of a battery system, electronic equipment and a computer readable storage medium, the battery system comprises a plurality of batteries connected in series, and the method comprises the following steps: obtaining charging state data of each battery in a charging process of the battery system; calculating an open-circuit voltage value of each battery at the end of charging based on the charging state data; judging whether a battery of which the open-circuit voltage value is smaller than Vth2 exists or not; vth2 is the right end point of the capacity attenuation significant change interval of the batteries of the same model; if yes, judging that the battery capacity of the battery system is unbalanced; and if not, judging that the battery capacity of the battery system is balanced. On the basis of the charging state data of the battery system, the open-circuit voltage value of each battery during charging cut-off can be calculated on line, then the capacity attenuation condition of each battery is obtained, the capacity balance of the battery system is accurately judged, maintenance or replacement can be carried out in time, and the stability of safe use of the battery system is guaranteed.

Description

technical field [0001] The present application relates to the technical field of battery management, and in particular, to a method, device, electronic device, and computer-readable storage medium for judging capacity balance of a battery system. Background technique [0002] Today, lithium-ion (Li-ion) batteries play a key role in transportation electrification and renewable energy systems as one of the main energy storage devices for electric vehicles and power stations. [0003] Generally speaking, a battery system is composed of dozens or even thousands of battery cells stacked in a complex series-parallel structure. Excessive attenuation of the capacity of one or several cells and high / low state of charge (SOC) will result in a significant reduction in the total available capacity of the battery system. Therefore, it is an important means to ensure the long-term efficient and stable operation of the battery system to accurately identify the different capacity attenuati...

AI Technical Summary

Problems solved by technology

Excessive attenuation of the capacity of one or several cells and excessive high / low state of charge (SOC) will cause a significant reduction in the total available capacity of the battery system

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