Optimal charging method for lithium-ion batteries based on cured charging voltage curve control

Abstract

The present invention relates to a lithium ion battery optimization charging technology based on charging voltage curve fixation control. The lithium ion battery optimization charging technology comprises: constructing an optimized charging mathematical model based on the analysis of the lithium ion battery charging mechanism; adopting the constant current charging voltage and the time data of the new battery 100%SOH at different rates as the input parameters of the optimized charging mathematical model; respectively evaluating the battery characteristic variable and the current parameter in the model by using a genetic algorithm; completing the charging voltage curve simulation and actual data acquisition by using the obtained charging current standard model; and with the correcting of the error between the simulation date and the actual data, determining the fixed voltage curve for controlling the charging process. According to the present invention, with the technology, the charging control on the lithium ion battery can be achieved, and the purposes of charging time shortening, charging efficiency improving and battery service life prolonging are achieved.

Description

technical field [0001] The invention relates to the technical field of lithium-ion charging, in particular to an optimal charging method for lithium-ion batteries based on curing charging voltage curve control. Background technique [0002] At present, the optimized charging technology mainly takes the form of constrained charging current as the starting point, which can be summarized into three categories: model simulation optimization, current segmentation optimization, and CC-CV improvement optimization. [0003] (1) Model simulation optimization. This type of technology usually uses electrochemical mechanism models to set optimization goals, select optimization algorithms, and give simulation results through software simulation. Model simulation optimization charging technology relies heavily on the battery mechanism model, and the selection of optimization goals is relatively single. It is difficult to achieve joint optimization of multiple goals. The simulation result...

AI Technical Summary

Problems solved by technology

Because the basic two-stage charging idea has not undergone fundamental changes, it cannot solve the problem of charging polarization, and there is a hidden danger of overcharging, so it will have a certain impact on battery life.

[0006] In addition, the above three types of technologies cannot realize the optimal adjustment of the charging process according to the change of the lithium-ion battery state (charge, life)

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