Apparatus and method for measuring insulation resistance of battery

Patent metadata

Field	Value
Publication number	US-9541608-B2
Application number	US-201314097941-A
Country	US
Kind code	B2
Filing date	Dec 5, 2013
Priority date	Mar 26, 2012
Publication date	Jan 10, 2017
Grant date	Jan 10, 2017

Abstract

Disclosed is an apparatus for measuring an insulation resistance that may calculate each of a cathode terminal-side insulation resistance value and an anode terminal-side insulation resistance value of a battery. The apparatus for measuring an insulation resistance according to the present disclosure forms different first and second circuits by selectively connecting an insulation resistance measurement unit to a cathode terminal or an anode terminal of the battery, and calculates a cathode terminal-side insulation resistance value and an anode terminal-side insulation resistance value from first and second insulation detection voltages applied to the insulation resistance measurement unit and simultaneous circuit equations derived from the first and the second circuits. Accordingly, quantitative insulation resistance values of the cathode terminal and the anode terminal of the battery may be each obtained.

First claim

What is claimed is:

1. An apparatus for measuring an insulation resistance, the apparatus comprising:
a first insulation resistance measurement unit and a second insulation resistance measurement unit connected to a cathode terminal and an anode terminal of a battery, respectively;
a first switch and a second switch to form different first and second circuits by selectively connecting the first insulation resistance measurement unit and the second insulation resistance measurement unit to the cathode terminal and the anode terminal, respectively;
a voltage detection unit to sense a first insulation detection voltage and a second insulation detection voltage applied to the first insulation resistance measurement unit and the second insulation resistance measurement unit; and
a control unit to calculate, via simultaneous circuit equations derived from the first circuit and the second circuit, a cathode terminal-side insulation resistance value and an anode terminal-side insulation resistance value from the first insulation detection voltage and the second insulation detection voltage,
wherein the second insulation resistance measurement unit further includes a direct current (DC) power applying unit, and
wherein the control unit calculates the following Equations including the simultaneous circuit equations for calculating the cathode terminal-side insulation resistance value and the anode terminal-side insulation resistance value:

R

Leak
⁡

(
+
)

=

(

V
Bat

-
A

)

⁢

(

V
Bat

-
C

)

-
AC

D
⁡

(

V
Bat

-
A

)

+
BC

R

Leak
⁡

(
-
)

=

(

V
Bat

-
A

)

⁢

(

V
Bat

-
C

)

-
AC

B
⁡

(

V
Bat

-
A

)

+
AD

⁢

∴
A

=

(

V
1

R
2

)

⁢

R
1

+

V
1

⁢

∴
B

=

V
1

R
2

⁢

∴
C

=

(

V

D
⁢

⁢
C

-

V
2

R

Assignees

• Lg Chemical Ltd

Inventors

• Hong Hyun-Ju
• Jang Jin-Su

Classifications

• G01R31/382

  Arrangements for monitoring battery or accumulator variables, e.g. SoC · CPC title

• G01R31/1227

  of components, parts or materials (G01R31/1209, G01R31/1218, G01R31/18 take precedence; circuits therefor G01R31/14; testing vessels of electrodes G01R31/16) · CPC title

• G01R31/385 Primary

  Arrangements for measuring battery or accumulator variables (for monitoring G01R31/382) · CPC title

• G01R27/18

  Measuring resistance to earth {, i.e. line to ground} · CPC title

• H01M10/48

  Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte (constructional details of current conducting connections for detecting conditions inside cells or batteries, e.g. details of voltage sensing terminals, H01M50/569) · CPC title