Lithium ion battery equalization maintenance method based on cloud platform

Abstract

The invention relates to a lithium ion battery equalization maintenance method based on a cloud platform. The method comprises the steps of obtaining historical data of a to-be-maintained module; based on the historical data of the to-be-maintained module, determining the service life and the equivalent cycle number of the to-be-maintained module, and determining an abnormal monomer needing to bereplaced in the to-be-maintained module; determining a state parameter of each normal monomer of the to-be-maintained module; screening out at least one lithium ion module with the same battery modeland application scene as the to-be-maintained module from a retired battery database of the Internet of Vehicles cloud platform; selecting a candidate module similar to the service life and the equivalent cycle turns of the to-be-maintained module from the at least one lithium ion module; determining a state parameter of a candidate monomer in the candidate module; in combination with the state parameters of the normal monomers, scoring each candidate monomer by adopting a multi-feature comprehensive nearest neighbor evaluation method, and determining one candidate monomer with the highest score as a replacement monomer; and replacing the abnormal monomer with the replacement monomer.

Description

technical field [0001] The invention is applied in the technical field of batteries, and in particular relates to a method for equalizing and maintaining lithium-ion batteries based on a cloud platform. Background technique [0002] Currently, lithium-ion batteries are widely used in electric vehicles (EVs), hybrid electric vehicles (HEVs) and grid energy storage. Due to factors such as design and production levels, differences in use, and environmental influences, battery packs will always show greater or lesser inconsistencies in various performance indicators, such as inconsistencies in SOC, inconsistencies in internal resistance, inconsistencies in self-discharge rates, and so on. Inconsistency will cause the poor performance of the single battery in the module to continue to deteriorate, and eventually the entire module cannot be used normally. [0003] When obvious inconsistencies lead to performance degradation, the conventional method is to use equalization circuits...

AI Technical Summary

Problems solved by technology

Inconsistency will cause the poor performance of the single battery in the module to continue to deteriorate, and eventually the entire module cannot be used normally

[0003] When there is obvious inconsistency that leads to performance degradation, the conventional method is to use equalization circuits or additional circuits for maintenance, and artificially reduce the inconsistency

When the inconsistency is serious and cannot be repaired, the current method is mostly to replace the entire module

However, the replacement of the new module and the entire battery system often have more serious inconsistencies, which brings the hidden danger of the battery system being damaged again

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