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Systems and methods for improved accuracy of battery resistance measurement systems

A technology of voltage measurement and battery testing, used in secondary battery testing, measuring electricity, power supply testing, etc.

Active Publication Date: 2017-06-06
VERTIV CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This can make it nearly impossible to effectively filter the AC ripple voltage from the desired DC voltage signal generated by the battery cell test

Method used

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  • Systems and methods for improved accuracy of battery resistance measurement systems
  • Systems and methods for improved accuracy of battery resistance measurement systems
  • Systems and methods for improved accuracy of battery resistance measurement systems

Examples

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Embodiment Construction

[0018] Example embodiments will now be described more fully with reference to the accompanying drawings.

[0019] refer to figure 1 , figure 1 Illustrated is a system 10 for reducing or eliminating the effects of voltage ripple when making battery cell measurements on a UPS 12 for the purpose of determining the internal resistance of a given battery cell of the UPS. The UPS 12 in this example, shown in highly simplified form, has six individual battery cells labeled "A" through "F" connected across the DC bus 12a of the UPS. In this example, cells A to F form one battery cell "string" of UPS 12 . A "test" voltmeter 16 is used to obtain a voltage measurement across the "cell under test" (cell C in this example). A second voltmeter 18, which will be referred to as the "reference" voltmeter, is used to obtain the voltage across one of the other cells in the string (cell D in this example).

[0020] A calibration phase may first be performed to determine the ratiometric differ...

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Abstract

The present invention discloses systems and methods for improved accuracy of battery resistance measurement systems. A method for reducing the effect of voltage ripple on battery test measurements of series-coupled battery cells forming a direct current (DC) bus is disclosed. A calibration operation is used to obtain a ratio difference between the series-connected first battery cell and the second battery cell of the DC bus, which may be indicative of a difference in respective output voltages of the first battery cell and the second battery cell. Then, voltage measurements across each of the two cells can be obtained at least substantially simultaneously. The voltage measurement made across the second battery cell may be modified using the ratio difference to generate a modified voltage measurement of the second battery cell. Next, a difference between the measured voltage across the first battery cell and the modified voltage measurement representing the filtered DC test voltage from which substantially all voltage ripple has been removed may be determined.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of US Provisional Application No. 61 / 781,393, filed March 14, 2013. The entire content of the above application is incorporated herein by reference. technical field [0003] The present disclosure relates to systems and methods for testing batteries used in uninterruptible power supply systems, and more particularly to systems and methods for enabling more accurate measurement of the internal battery resistance of each unit of an uninterruptible power supply . Background technique [0004] This section provides background information related to the present disclosure which is not necessarily prior art. [0005] The internal resistance of the battery cell is an indication of the state of health of the battery cell. Battery monitoring systems, often used in uninterruptible power supply ("UPS") systems, can determine the voltage within a single unit by periodically injecting pulses o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R27/14G01R31/36
CPCG01R31/40G01R35/00H01M10/482G01R31/396G01R31/389G01R31/3835Y02E60/10G01R31/42H01M10/4285G01R33/42
Inventor 特里·D·布什布赖恩·科加尔小鲁塞尔·E·谢特勒查尔斯·奥唐奈
Owner VERTIV CORP
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