Power lithium battery model parameter identifying and dump energy estimating method

A technology of remaining power and model parameters, which is applied in the direction of measuring electrical variables, measuring electricity, measuring devices, etc., and can solve the problems of inaccurate estimation of remaining power and reduction of modeling accuracy.

Inactive Publication Date: 2018-05-25
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology

However, for lithium batteries, due to the internal strong nonlinear characteristics, its model parameters will inevitably not be time-invarian

Method used

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  • Power lithium battery model parameter identifying and dump energy estimating method
  • Power lithium battery model parameter identifying and dump energy estimating method
  • Power lithium battery model parameter identifying and dump energy estimating method

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Embodiment Construction

[0088] The technical solutions and technical effects adopted by the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0089] like figure 1 As shown in the figure, the estimation system for the remaining power of the power lithium battery includes: 1. a charging device and a load circuit that control the charging and discharging of the battery pack; 2. a current monitor that collects the current of the battery pack, and a number that samples the voltage of the battery pack Analog converter; 3. Data acquisition card for collecting data from current monitor and digital-to-analog converter; 4. Low-pass filter for filtering, and remaining power estimation algorithm module on the computer.

[0090] For a lithium battery pack consisting of ten batteries in parallel, firstly charge through the battery charging device, after fully charged, set the working condition and discharge by the load circuit, use the current...

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Abstract

The invention discloses a power lithium battery model parameter identifying and dump energy estimating method. The method includes the steps of firstly, establishing a state space equation of a two-order impedance-capacitance model of a lithium battery; secondly, establishing a regression model of the relation of an end voltage and open circuit voltage and a current; thirdly, conducting parameteridentifying based on an iterative learning recursive least-squares method on the regression model; fourthly, conducting identifying based on the iterative learning recursive least-squares method on experimental data meeting the discharge current conditions in the parameter identifying process in the third step to obtain prediction errors, and conducting converging through the prediction errors toobtain a nonlinear function in parameters of the state space equation and a parameter set; fifthly, verifying the battery model precision formed by the nonlinear function and the parameter set obtained in the fourth step; sixthly, collecting current and voltage data, and estimating the dump energy through expanded Kalman filtering. The model parameter identifying precision is high, the dump energyestimation value error is small, and good application prospects are achieved.

Description

technical field [0001] The invention relates to the technical field of battery management of new energy vehicles, in particular to a method for identifying parameters of a power lithium battery model and estimating remaining power. Background technique [0002] In the State Council's 13th Five-Year Plan for National Science and Technology Innovation, the development of new energy vehicles is the first item to establish and improve the core technology system of transportation. In the development of new energy vehicles, my country mainly promotes pure electric vehicles, and power lithium batteries are the core energy source of pure electric vehicles. The remaining power of the lithium battery, that is, the percentage of the usable capacity to the rated capacity, is an important parameter to ensure the safe operation of the lithium battery and prolong the usable life. The complexity of the electrochemical reaction inside the lithium battery causes the strong nonlinearity of th...

Claims

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Application Information

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IPC IPC(8): G01R31/36
CPCG01R31/367G01R31/3842
Inventor 祝乔
Owner SOUTHWEST JIAOTONG UNIV
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