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Method and system for monitoring residual capacity of storage battery on line based on internal resistance method

A technology of remaining power and monitoring system, applied in the direction of measuring electrical variables, measuring electricity, measuring devices, etc., can solve the problems of low reliability and low precision, and achieve the goal of reducing conversion errors, guaranteeing conversion accuracy, and high-precision real-time online monitoring. Effect

Inactive Publication Date: 2014-03-12
SOUTH CHINA UNIV OF TECH +1
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AI Technical Summary

Problems solved by technology

Nowadays, a lot of research has been done on the measurement of battery remaining power, but there are still shortcomings such as low accuracy and low reliability, so improvement and innovation are still needed in online monitoring of battery remaining power

Method used

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  • Method and system for monitoring residual capacity of storage battery on line based on internal resistance method
  • Method and system for monitoring residual capacity of storage battery on line based on internal resistance method
  • Method and system for monitoring residual capacity of storage battery on line based on internal resistance method

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Embodiment Construction

[0028] The present invention will be further described below in conjunction with specific examples.

[0029] The method for on-line monitoring of battery remaining power based on the internal resistance method described in this embodiment is as follows:

[0030] 1) Fully charge the battery, then discharge the battery at a fixed discharge rate, and record the internal resistance and remaining power of the battery during the discharge process in real time. into the EEPROM of the MSP430F149 microcontroller;

[0031] 2) Connect the constant AC current signal source to both ends of the battery, apply a constant AC current signal to the battery, and then measure the AC voltage amplitude U at both ends of the battery S And the AC current amplitude I flowing through the battery S , and then according to the formula: That is, the AC impedance Z of the battery is obtained;

[0032] 3) Measure the phase difference θ between the AC signal applied to both ends of the battery and its A...

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Abstract

The invention discloses a method and a system for monitoring the residual capacity of a storage battery on line based on the internal resistance method. The method comprises the following steps of connecting a constant alternating current stabilized power supply to two ends of the storage battery, then acquiring an alternating voltage peak at the two ends of the storage battery and an alternating current peak flowing through the storage battery by a peak-holding circuit, detecting a phase difference between an alternating voltage signal and an alternating current signal through a phase detecting circuit, and finally, sending the acquired alternating voltage peak, alternating current peak and phase difference to a single chip microcomputer for data processing to obtain the residual capacity of the storage battery, and displaying the measured residual capacity of the storage battery in real time so as to realize real-time on-line monitoring on the residual capacity of the storage battery. By adopting the scheme disclosed by the invention, high-efficiency visual real-time intelligent on-line monitoring on the residual capacity of the storage battery is realized.

Description

technical field [0001] The invention relates to the technical field of on-line monitoring of battery remaining power, in particular to an online monitoring method and system for battery remaining power based on an internal resistance method. Background technique [0002] At present, batteries have been widely used in industrial production, electric power, transportation and communication industries. In addition to directly supplying power to electrical equipment, the battery is often used as a backup power supply. When there is a problem with the power grid, solar power generation, wind power generation, etc., it can provide emergency power in a timely and effective manner to ensure the stable, continuous and effective operation of the electrical equipment. The energy storage status is closely related to the reliability and stability of the entire power supply system. Therefore, it is of great significance to realize the online monitoring of the remaining power of the batte...

Claims

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Application Information

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IPC IPC(8): G01R31/36
Inventor 戴栋张敏李述文张建伟曹敏
Owner SOUTH CHINA UNIV OF TECH
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