Estimation method of initial state of charge (SOC0) of lead-acid cell

A state of charge, lead-acid battery technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve problems such as zero inaccuracy, and achieve the effect of improving estimation accuracy

Inactive Publication Date: 2013-04-03
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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Problems solved by technology

[0004] The object of the invention is to provide a kind of lead-acid battery initial state of charge SOC

Method used

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  • Estimation method of initial state of charge (SOC0) of lead-acid cell
  • Estimation method of initial state of charge (SOC0) of lead-acid cell
  • Estimation method of initial state of charge (SOC0) of lead-acid cell

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Embodiment Construction

[0024] The technical solution of the present invention will be further described below in conjunction with the drawings and specific embodiments, but the present invention is not limited to this embodiment.

[0025] Such as figure 1 As shown, the initial state of charge SOC of the lead-acid battery 0 The estimation method includes the following steps:

[0026] a. Collect the current flowing through the battery and the terminal voltage of the battery;

[0027] b. Determine whether the battery is in a static state, if not, go to step c, otherwise go to step d;

[0028] c. Using the SOC in the discharge state 0 The relationship between the terminal voltage and the discharge rate, the initial state of charge SOC 0 , and go to step g;

[0029] d. Determine whether the battery is in a stable state, if not, go to step e, otherwise go to step f;

[0030] e. Call the SOC value recorded before standing as the initial state of charge SOC 0 , and go to step g;

[0031] f. Using the ...

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Abstract

The invention provides an estimation method of the initial state of charge (SOC0) of a lead-acid cell. The method includes the following steps: a. collecting current flowing through the cell and end voltage of the cell; b. judging whether the cell is in the standing state, entering step c on not judgment and entering step d on yes judgment; c. adopting the relation between the SOC0 and the end voltage and the discharge multiplying power under the discharge state to obtain the initial SOC and entering step g; d. judging whether the cell is in the stable state, entering step e on no judgment and entering step f on yes judgment; e. utilizing the SOC value recorded before standing as the initial SOC and entering the step g; f. adopting the OCV-SOC relation in the standing state to obtain the SOC and entering the step g; g. adopting an ampere-hour integral method to estimate the SOC of the cell in real time. The estimation method considers the discharge state and the standing state of the cell and effects of the discharge multiplying power, standing time and the like on the SOC0, and improves estimation accuracy of the SOC0 accordingly.

Description

technical field [0001] The invention belongs to the technical field of lead-acid batteries, in particular to a lead-acid battery initial state of charge SOC 0 method of estimating. Background technique [0002] The battery state of charge (SOC) is used to indicate the remaining power of the battery. It is an important parameter that reflects the current state of the battery and controls the charging and discharging of the battery. Its accurate estimation is of great significance. At present, the estimation of SOC is generally obtained by the initial state of charge SOC of the battery through the open circuit voltage method. 0 , and then use the ampere-hour integration method to calculate the SOC of the battery in real time, that is, Therefore, the battery initial state of charge SOC 0 It is the premise guarantee for accurate estimation of SOC. [0003] However, simply using the open circuit voltage to obtain the initial state of charge SOC of the battery 0 There are gr...

Claims

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Application Information

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IPC IPC(8): G01R31/36
Inventor 林仕立宋文吉冯自平张艳辉吕杰
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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