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Accumulator cell internal resistance and degradation state on-line monitoring method and system

A technology of deterioration state and monitoring system, applied in the direction of measuring resistance/reactance/impedance, measuring electricity, measuring devices, etc., can solve the problems of reduced amplitude of effective current change, increased battery test, and damage to the integrity of backup energy, etc., to achieve Accurately Measured Effects

Inactive Publication Date: 2007-06-06
孙斌
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, in actual use, especially in UPS, communication power supply, and electric operating power supply, due to the connection between the battery system and various systems such as chargers and loads, it is very difficult to test the battery
Especially without affecting the working state of the battery itself, it is very difficult to accurately measure the internal resistance and deterioration state of the battery
[0004] The most direct monitoring method of the battery is to conduct a discharge test to measure the actual capacity of the battery, but such a test is expensive, time-consuming, and destroys the integrity of the backup energy source, so it is impossible to use it frequently
In the online measurement, the internal resistance is generally calculated by connecting the discharge resistor at both ends of the battery pack or feeding the excitation current, and measuring the current of the battery circuit and the voltage change of the battery at the same time. Due to the influence of the parallel connection between the charger and the load, the battery The amplitude of the effective current change generated on the circuit is reduced and unstable

Method used

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  • Accumulator cell internal resistance and degradation state on-line monitoring method and system
  • Accumulator cell internal resistance and degradation state on-line monitoring method and system
  • Accumulator cell internal resistance and degradation state on-line monitoring method and system

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Embodiment 1

[0040]Embodiment 1: As shown in Figure 1, the battery internal resistance and deterioration state online monitoring system includes an excitation unit and a detection unit. The excitation unit is composed of two sets of signal generators and constant current sources. The current sine wave or rectangular wave signal is transmitted to the constant current source; among them, three segmentation points A, B, and C are set in the battery pack to divide the battery pack into four sections, and the signal generator is connected to the segmentation points A and B 1 and constant current source 1, connect the signal generator 2 and constant current source 2 at subsection points B and C, respectively measure the single batteries in the battery pack, and connect the total positive pole and the total negative pole of the battery The excitation unit, the excitation unit is used to generate a specific waveform and the peak-to-peak constant excitation current provides an excitation signal for ...

Embodiment 2

[0043] Embodiment 2: The on-line monitoring system for battery internal resistance and deterioration state as shown in Figure 3 includes an excitation unit and a detection unit. The excitation unit includes multiple sets of signal generators and constant current sources, and they are connected in parallel. The battery The group is divided into two or more sections; Figure 3 is divided into two sections, each section uses two signal generators and constant current sources, and two wires are drawn from the excitation unit to connect with the positive, midpoint and negative terminals of the section in the battery pack .

[0044] As shown in Figure 4, the schematic diagram of the excitation signal circuit when external excitation is added during the measurement process; according to the size of the excitation signal current required for the test and the number of cells in the test battery, the current circuit can be selected. The arc shown in the figure is The signal circuit when ...

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Abstract

The invention discloses an online monitoring method and system for the accumulator inherent resistance and deteriorates state which includes the motivation unit and the detecting unit. It sets the subsection point in the accumulator point; the motivation unit is connected with the positive / negative electrode of the accumulator bus and the subsection point of the battery group. The detection unit is connected with positive / negative electrode of every accumulator in accumulator group by the link. The mentoring method includes: the accumulator is divided into sections, the whole positive electrode and the negative electrode and every subsection point are connected to the motivation unit by the motivation signal line, every signal accumulator is connected with the detection unit; the signal generator in motivation unit and the constant resource give some frequency and constant rectangle wave or sine wave signal to the sectional accumulator. The diction unit detects the voltage response of the signal accumulator to the motivation signal and computes the inherent resistance of the accumulator to analysis the deteriorate state.

Description

technical field [0001] The present invention relates to a battery testing method and system, in particular to a method for monitoring on-line internal resistance and deterioration status of backup power storage batteries used in series in power systems such as UPS (uninterruptible power supply), electric operating power supply, and communication power supply and system. Background technique [0002] Batteries are the most widely used electrical energy storage devices at present. It realizes the storage of electrical energy through the conversion of electrical energy and chemical energy, and plays a vital role in many industrial and civil occasions. The backup battery system in power supply systems such as UPS, communication power supply, and electric operating power supply generally adopts a series connection method. The state deterioration of some single batteries in the series battery pack directly affects the overall capacity state of the backup battery pack, making the ...

Claims

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Application Information

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IPC IPC(8): G01R27/02G01R31/36
Inventor 孙斌李迎凯梁育林李洵
Owner 孙斌
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