Method for estimating capacity of lithium ion battery in real time

A lithium-ion battery and capacity technology, applied in the direction of measuring electrical variables, measuring electricity, measuring devices, etc., can solve the problems of difficult capacity estimation and large amount of calculation, and achieve the effect of breaking through the difficult problem of online capacity estimation
CN108732508AInactive Publication Date: 2018-11-02BEIHANG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
BEIHANG UNIV
Publication Date
2018-11-02
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a method for estimating the capacity of a lithium ion battery in real time. The initial electric quantity and voltage data are processed into data with certain voltage intervals, and then differential operation is carried out to obtain an IC curve. A nonlinear minimum square law is used for fitting an IC curve by using a gaussian function, and the parameter value of the gaussian function is obtained. The correlation between the parameters of the gaussian function and the capacity of the battery is analyzed, and a capacity estimation model is established. When the on-line capacity is estimated, the acquired charging data is processed, the parameter value of the gaussian function obtained by fitting is used as a model input to estimate the capacity of the real-timebattery. According to the method, the problem of online application of the capacity increment method is solved, and the problem of online estimating the battery capacity is broken through. In one embodiment of the invention, the real-time estimation error of the algorithm is less than 3%.
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Description

technical field

[0001] The invention belongs to the technical field of automobiles, and in particular relates to a method capable of accurately and real-time evaluating the capacity of lithium-ion batteries used in electric vehicles. Background technique

[0002] Due to the advantages of high energy and power density, low self-discharge rate, and weak memory effect, lithium-ion batteries have become the first choice for current electric vehicle power batteries. As the power core of electric vehicles, its health status has a significant impact on the cost and cruising range of electric vehicles, so it is necessary to evaluate the battery capacity in real time.

[0003] Currently, there are three methods for real-time estimation of battery capacity under vehicle conditions: charge-discharge method, model-based method, voltage differential method, and capacity increment method. The charging and discharging method is to obtain the estimated value of the battery capacity accordi...

Claims

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