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Charge state estimation method based on initial value optimization

A state of charge and initial value technology, applied in the field of SOC estimation of automotive power batteries, can solve problems such as low accuracy

Active Publication Date: 2014-04-16
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Charge state estimation method based on initial value optimization
  • Charge state estimation method based on initial value optimization
  • Charge state estimation method based on initial value optimization

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[0031] like figure 2 The model shown establishes the Kalman filter algorithm. Among them, E is the standard voltage source, R is the ohmic internal resistance, and U(up) is the polarization voltage.

[0032] S1. Initialize various parameters of the battery;

[0033] S2. Estimate the amount of charge accumulated by the battery in the previous stage of use due to the polarization effect, including:

[0034] At constant temperature:

[0035] Charging: power consumption = SOC increment + accumulated charge

[0036] which is Through the ΔSOC corresponding to different current values, we can get Different current values ​​and α corresponding to different current values ​​through matlab 1 (I) Fitting, get α 1 (I)=p 1 i 4 +p 2 i 3 +p 3 i 2 +p 4 i 1 +p 5 , α 1 (I) is the coefficient of charging efficiency about current;

[0037] Discharge: SOC reduction = power consumption + accumulated charge

[0038] which is Through the ΔSOC corresponding to different current...

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Abstract

The invention belongs to the technical field of automobile power batteries, and particularly relates to an SOC estimation method of an automobile power battery. Charging and discharging are conducted on the battery over and over again, then standing is performed, the voltage value of the battery in the process from charging and discharging to standing is detected, stable voltage time t(off) is recorded, and an initial value SOC(t0+delta t) is obtained. The battery is used within recovery time, a precise SOC initial value can be provided for the battery, and thus the SOC value estimated by expanding a Kalman filtering method can be converged more quickly.

Description

technical field [0001] The invention belongs to the technical field of automobile power batteries, in particular to a method for estimating the SOC of automobile power batteries. Background technique [0002] SOC is one of the important parameters of the battery, which refers to the remaining power of the battery. SOC provides an important basis for the operating state of the battery. But SOC is affected by many factors, and its value can only be estimated by measuring the values ​​of these factors. [0003] At present, domestic and foreign power battery SOC estimation methods mainly include discharge test method, open circuit voltage method, ampere-hour measurement method, internal resistance measurement method, Kalman filter method, load voltage method and neural network method. The most commonly used are: open circuit voltage method, ampere-hour measurement method, Kalman filter method. [0004] Open circuit voltage method: determine the size of SOC through the function...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36
Inventor 向勇范正航毕闯向俊杰
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA