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UKF-based storage battery SOC (state of charge) estimation method

A state of charge and storage battery technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve problems such as complex estimation, inaccurate estimation, and poor real-time performance

Inactive Publication Date: 2014-04-23
GUANGXI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention uses the unscented Kalman filter UKF method to estimate the SOC of the battery state of charge, realizes non-linear transmission through unscented transformation, solves the problems of poor real-time performance, complicated estimation and inaccurate estimation in the prior art, and completes the online storage of power batteries measurement, reducing hardware costs

Method used

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  • UKF-based storage battery SOC (state of charge) estimation method
  • UKF-based storage battery SOC (state of charge) estimation method
  • UKF-based storage battery SOC (state of charge) estimation method

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Embodiment Construction

[0041] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative work, any modifications, equivalent replacements, improvements, etc., shall be included in the protection scope of the present invention Inside.

[0042] Such as figure 1 with 2 Shown, the battery state of charge SOC estimation method based on UKF of the present invention, its steps are:

[0043] 1) Carry out charge and discharge tests on the battery at different temperatures and SOC, obtain the open circuit voltage of the battery by standing still, and obtain the functional relationship between the open circuit voltage and SOC by...

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Abstract

The invention discloses a UKF-based storage battery SOC (state of charge) estimation method. The characteristics of a storage battery are tested to obtain basic information of the storage battery; and a mathematical model of the storage battery is established, battery performance is tested through an HPPC test in a FreedomCAR battery test handbook to obtain data, battery model parameters are obtained through parameter identification, a UKF algorithm is design to estimate the storage battery SOC, nonlinear transmission is realized through an unscented transformation method, thus the problems in the prior art that real-time performance is poor, and estimation is complicated and inaccurate are solved, thereby completing on-line measurement of a power battery, and reducing hardware costs.

Description

technical field [0001] The invention relates to the technical field of estimating the state of charge SOC of a power battery, in particular to a method for estimating the state of charge SOC of a battery based on UKF. Background technique [0002] SOC is the abbreviation of state of charge in English. As a term in the battery industry, it specifically refers to the state of charge of the battery. The ratio, usually expressed as a percentage. [0003] In recent years, the development of power batteries has been extremely rapid, but correspondingly, the development of battery management technology has lagged behind seriously, which has also led to battery management technology becoming an important factor restricting the development of electric vehicles. Due to the imperfect management technology, the power battery for electric vehicles is in a state of overcharge or overdischarge for a long time, and the battery performance gradually deteriorates with use, resulting in high ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36
Inventor 刘胜永
Owner GUANGXI UNIVERSITY OF TECHNOLOGY