Storage battery monitoring device

Patent metadata

Field	Value
Publication number	US-2016178684-A1
Application number	US-201314892410-A
Country	US
Kind code	A1
Filing date	May 31, 2013
Priority date	May 31, 2013
Publication date	Jun 23, 2016
Grant date	—

Abstract

A storage battery monitoring device includes a pair of measurement lines connected respectively to a pair of voltage detection lines connected respectively to a positive and a negative electrode of a rechargeable battery, a pair of adjustment lines connected respectively to the pair of voltage detection lines in parallel with the measurement lines, a first capacitive element connected between the pair of measurement lines, a second capacitive element connected between the pair of adjustment lines, and a switch connected across the second capacitive element. Capacitance values of the first and second capacitive elements are set such that a voltage between the pair of measurement lines continues changing after closing the switch and then opening the switch after a lapse of a predetermined short-circuit time if the voltage detection line is broken.

First claim

1 . A storage battery monitoring device comprising:
a pair of measurement lines connected respectively to a pair of voltage detection lines connected respectively to a positive and a negative electrode of a rechargeable battery; a pair of adjustment lines connected respectively to the pair of voltage detection lines in parallel with the measurement lines; a first capacitive element connected between the pair of measurement lines; a second capacitive element connected between the pair of adjustment lines; and a switch connected across the second capacitive element, wherein a capacitance values Cmeas of the first capacitive element and a capacitance value Cba 1 of the second capacitive elements are set such that a voltage between the pair of measurement lines continues changing after closing the switch and then opening the switch after a lapse of a predetermined short-circuit time upon the voltage detection line being broken, the capacitance value Cmeas of the first capacitive element and the capacitance value Cba 1 of the second capacitive element are further set in such a manner as to satisfy the following inequality based on a maximum voltage Vmax between the pair of measurement lines upon the voltage detection line being not broken, and a predetermined threshold voltage Vth for detecting a break in the voltage detection line,
C meas/( Cba 1 +C meas)< Vth/V max, and
the storage battery monitoring device further comprising: a voltage measurement unit which measures a voltage between the pair of measurement lines after closing the switch and opening the switch after the lapse of the short-circuit time; and a break detection unit which compares the voltage measured by the voltage measurement unit with the threshold voltage Vth, and detects a break in the voltage detection line based on the comparison result.

2 . (canceled)

3 . (canceled)

Assignees

• Hitachi Automotive Systems Ltd

Inventors

• Kato Shinya
• Machida Akihiro

Classifications

• H02J7/60

  including safety or protection arrangements · CPC title

• H02J7/50

  acting upon multiple batteries simultaneously or sequentially · CPC title

• G01R31/52

  Testing for short-circuits, leakage current or ground faults · CPC title

• G01R35/00

  Testing or calibrating of apparatus covered by the other groups of this subclass · CPC title

• G01R31/3835

  involving only voltage measurements · CPC title