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

Inactive Publication Date: 2018-11-02
BEIHANG UNIV
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  • Abstract
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Problems solved by technology

However, this method has a large amount of calculation and has high requirements for the battery management system, so it is difficult to achieve real-time capacity estimation

Method used

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  • Method for estimating capacity of lithium ion battery in real time
  • Method for estimating capacity of lithium ion battery in real time
  • Method for estimating capacity of lithium ion battery in real time

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Embodiment Construction

[0040] Embodiments of the invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0041] The present invention proposes a method for estimating the capacity of a lithium-ion battery by using a Gaussian function to fit an IC curve. The method can at least be used for online capacity estimation of a power battery.

[0042] According to an embodiment of the present invention, it specifically includes the following steps:

[0043] as attached figure 1 As shown, the following steps can be divided into two stages. The first stage is the battery test and model calibration stage, which is generally carried out in the laboratory; the second stage is the online estimation stage, which is the implementation process of the battery capacity online estimat...

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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%.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36G01R31/00
CPCG01R31/006
Inventor 宋凌珺梁统一石凯
Owner BEIHANG UNIV
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