US 9,541,608 B2Granted

Apparatus and method for measuring insulation resistance of battery

AssigneeLG Chem, Ltd.

InventorsHyun-Ju Hong, Jin-Su Jang

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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.

Claims16

Dependent claims

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
2
)
⁢
R
1
-
V
2
⁢
∴
D
=
V
D
⁢
⁢
C
-
V
2
R
2
,
where VBat denotes a battery voltage value, V1 denotes a first insulation detection voltage, V2 denotes a second insulation detection voltage, VDC denotes a voltage value of a DC power applying unit, R1 denotes a first resistance value, R2 denotes a second resistance value, RLeak(+) denotes the cathode terminal-side insulation resistance values, and RLeak(−) denotes the anode terminal-side insulation resistance value.

130 more elements

An apparatus for measuring an insulation resistance, the apparatus comprising:

an insulation resistance measurement unit connected to a cathode terminal or an anode terminal of a battery;
a switch unit to form different first and second circuits by selectively connecting the insulation resistance measurement unit to the cathode terminal and the anode terminal of the battery;
a voltage detection unit to sense a first insulation detection voltage and a second insulation detection voltage applied to the 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 switch unit forms different first and second circuits by selectively connecting one end of the insulation resistance measurement unit to the cathode terminal or the anode terminal of the battery and selectively connecting the other end of the insulation resistance measurement unit to a ground or a 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
DC
-
V
2
R
2
)
⁢
R
1
-
V
2
⁢
∴
D
=
V
DC
-
V
2
R
2
,
⁢
where VBat denotes a battery voltage value, V1 denotes the first insulation detection voltage, V2 denotes the second insulation detection voltage, VDC denotes a voltage value of a DC power applying unit, R1 denotes a first resistance value, R2 denotes a second resistance value, RLeak(+) denotes the cathode terminal-side insulation resistance value, and RLeak(−) denotes the anode terminal-side insulation resistance value.

125 more elements

A method of measuring an insulation resistance of a battery using a first Insulation detection voltage and a second insulation detection voltage detected by a first insulation resistance measurement unit and a second insulation resistance measurement unit connected to a cathode terminal and an anode terminal of the battery respectively, the method comprising:

(a) sensing the first insulation detection voltage after forming a first circuit by connecting the first insulation resistance measurement unit to the cathode terminal of the battery;
(b) sensing the second insulation detection voltage after forming a second circuit by connecting the second insulation resistance measurement unit to the anode terminal of the battery;
and
(c) calculating, 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 includes a direct current (DC) power applying unit, and
wherein the calculating the cathode terminal-side insulation resistance value and the anode terminal-side insulation resistance value comprises calculating the following Equations including the simultaneous circuit equations,
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
DC
-
V
2
R
2
)
⁢
R
1
-
V
2
⁢
∴
D
=
V
DC
-
V
2
R
2
,
where VBat denotes a battery voltage value, V1 denotes a first insulation detection voltage, V2 denotes a second insulation detection voltage, VDC denotes a voltage value of a DC power applying unit, R1 denotes a first resistance value, R2 denotes a second resistance value, RLeak(+) denotes the cathode terminal-side insulation resistance value, and RLeak(−) denotes the anode terminal-side insulation resistance value.

123 more elements

A method of measuring an insulation resistance of a battery using a first insulation detection voltage and a second insulation detection voltage detected by an insulation resistance measurement unit connected to a cathode terminal or an anode terminal of the battery, the method comprising:

(a) sensing the first insulation detection voltage after forming a first circuit by connecting the insulation resistance measurement unit to the cathode terminal of the battery;
(b) sensing the second insulation detection voltage after forming a second circuit by connecting the insulation resistance measurement unit to the anode terminal of the battery;
and
(c) calculating, 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 sensing the first insulation detection voltage comprises detecting the first insulation detection voltage after forming the first circuit by connecting one end of the insulation resistance measurement unit to the cathode terminal of the battery and the other end of the insulation resistance measurement unit to a ground, and the sensing the second insulation detection voltage comprises detecting the second insulation detection voltage after forming the second circuit by connecting the other end of the insulation resistance measurement unit to the anode terminal of the battery and the other end of the insulation resistance measurement unit to a DC power applying unit, and
wherein the calculating the cathode terminal-side insulation resistance value and the anode terminal-side insulation resistance value comprises calculating the following Equations including the simultaneous circuit equations,
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
DC
-
V
2
R
2
)
⁢
R
1
-
V
2
⁢
∴
D
=
V
DC
-
V
2
R
2
,
where VBat denotes a battery voltage value, V1 denotes a first insulation detection voltage, V2 denotes a second insulation detection voltage, VDC denotes a voltage value of a DC power applying unit, R1 denotes a first resistance value, R2 denotes a second resistance value, RLeak(+) denotes the cathode terminal-side insulation resistance value, and RLeak(−) denotes the anode terminal-side insulation resistance value.

123 more elements

Dependencies are inferred from the claim text.

Facts

Application: 14/097,941Filed 5 Dec 2013 · continuation
Priority: KR 10-2012-003052726 Mar 2012
Published: US 2014/0095093 A13 Apr 2014
Granted: 10 Jan 2017
Term ends: Not estimatedThe source records don’t support an estimate.

Classification10 codes

G01R 31/385
Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of…
G01R 31/1227
Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an…
G01R 31/52
Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections: testing…
H01M 10/48
Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells: accumulators combined with arrangements for…