Method for estimating power battery capacity and charge state based on data model fusion

A technology of power battery and state of charge, which is applied in the direction of measuring electrical variables, measuring electricity, measuring devices, etc., can solve the problems of overcharge, abuse, and overdischarge of power batteries, and achieves a small amount of calculation, simple calculation, and high estimation accuracy. Effect

Active Publication Date: 2016-08-10
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

However, at present, when estimating the state of charge SOC of the power battery, the determined maximum available capacity is mostly used to estimate the state of charge of the power battery, and in actual use, the maximum available capacity of the power battery will change with the The aging of the power battery gradually degr

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  • Method for estimating power battery capacity and charge state based on data model fusion
  • Method for estimating power battery capacity and charge state based on data model fusion
  • Method for estimating power battery capacity and charge state based on data model fusion

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Embodiment Construction

[0071] Combine below Figure 1-13 The method for estimating the power battery capacity and state of charge based on data model fusion of the present invention is described in detail.

[0072] Such as figure 1 As shown, the power battery of the electric vehicle is subjected to aging experiments, and the corresponding relationship between the open circuit voltage, state of charge and the maximum available capacity of the power battery under different aging degrees is obtained, and the power battery is established under different aging degrees. The three-dimensional response surface formed by the open circuit voltage and the state of charge and available capacity corresponding to the open circuit voltage. Establish the equivalent circuit model of the power battery, and identify the model parameters of the equivalent circuit model of the power battery and the initial value z of the state of charge of the power battery according to the set objective function and constraint conditi...

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Abstract

The invention relates to the field of estimating power battery parameters and states, in particular to a method for estimating the power battery capacity and charge state based on data model fusion. In order to improve the estimation precision of the power battery charge state of an electric vehicle, the invention provides the method for estimating the power battery capacity and charge state based on the data model fusion, and the method comprises the steps of carrying out an aging experiment for a power battery, obtaining a three-dimensional response surface relation formed by the open-circuit voltage, charge state and available capacity of the power battery at different aging degrees, establishing an equivalent circuit model for the power battery, inputting the actual measurement end voltage and charge and discharge currents of the power battery into a model equation of the power battery, identifying model parameters of the equivalent circuit model of the power battery and the maximum available capacity and a charge state initial value of the power battery, and estimating the charge state of the power battery. The method of the invention can be used for estimating the capacity and charge state of the power battery at different aging degrees, and is high in practicality and estimation precision.

Description

technical field [0001] The invention relates to the field of estimation of power battery parameters and states, in particular to a method for estimating the capacity and state of charge of an on-board power battery of an electric vehicle based on data model fusion. Background technique [0002] New energy vehicles, mainly electric vehicles, are one of my country's strategic emerging industries and one of the key areas of "Made in China 2025". The power battery is the core component of the electric vehicle. Therefore, the estimation accuracy of the parameters and state of the power battery directly affects the safety and reliability of the electric vehicle application. [0003] In recent years, the estimation of the state of charge (SOC) of a power battery has been a research hotspot in both academia and industry, and some achievements have been made. However, at present, when estimating the state of charge SOC of the power battery, the determined maximum available capacity ...

Claims

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Application Information

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IPC IPC(8): G01R31/36
CPCG01R31/387
Inventor 熊瑞杨瑞鑫何洪文孙逢春
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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