CN203337736U - Lithium battery insulation resistance online detection circuit - Google Patents
Lithium battery insulation resistance online detection circuit Download PDFInfo
- Publication number
- CN203337736U CN203337736U CN2013204563957U CN201320456395U CN203337736U CN 203337736 U CN203337736 U CN 203337736U CN 2013204563957 U CN2013204563957 U CN 2013204563957U CN 201320456395 U CN201320456395 U CN 201320456395U CN 203337736 U CN203337736 U CN 203337736U
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- Prior art keywords
- resistance
- lithium battery
- resistor
- switch
- detection circuit
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Abstract
A lithium battery insulation resistance online detection circuit relates to a lithium battery insulation resistance detection circuit. The circuit is provided to solve slow measuring speed and low accuracy of present lithium battery insulation resistance detection methods. According to the circuit, anode of a lithium battery pack Bat is simultaneously connected with one end of a resistor Ra1, one end of a resistor Rs1 and one end of a resistor R1 to be measured; the other end of the resistor Ra1 is connected with a static end of a No.1 switch K1; a dynamic end of the No.1 switch K1 is simultaneously connected with a static end of a No.2 switch K2, one end of the resistor Rs1, one end of a resistor Rs2, the other end of the resistor R1 to be measured, one end of a resistor R2 to be measured and a power end of an electric chassis; a dynamic end of the No.2 switch K2 is connected with one end of a resistor Ra2; and cathode of the lithium battery pack Bat is simultaneously connected with the other end of the resistor Ra2, the other end of the resistor Rs2 and the other end of the resistor R2 to be measured. The Lithium battery insulation resistance online detection circuit provided by the utility model is suitable for a lithium battery management system of an electric vehicle.
Description
Technical field
The utility model relates to a kind of lithium battery insulating resistor detecting circuit.
Background technology
The insulation resistance of electric automobile is one of important safety index, measurement be the resistance between the positive and negative power supply master tape of lithium battery group and electric chassis.But at present, the measuring speed of the measuring method of lithium battery insulation resistance is slow, accuracy rate is lower.
The utility model content
The utility model is in order to solve the existing problem that measuring speed is slow, accuracy rate is low that detects the method for lithium battery insulation resistance, thereby provides a kind of lithium battery insulation resistance at line detection circuit.
The lithium battery insulation resistance is at line detection circuit, and it comprises resistance R s1, resistance R s2, resistance R a1, resistance R a2, a K switch 1 and No. two K switch 2;
The anodal of described lithium battery group Bat is connected with the end of resistance R a1, the end of resistance R s1 and the end of testing resistance R1 simultaneously; The other end of resistance R a1 is connected with the quiet end of a K switch 1; The moved end of a described K switch 1 is connected with the power end on electric chassis 1 with the quiet end of No. two K switch 2, the other end of resistance R s1, the end of resistance R s2, the other end of testing resistance R1, the end of testing resistance R2 simultaneously; The moved end of described No. two K switch 2 is connected with the end of resistance R a2; The negative pole of described lithium battery group Bat is connected with the other end of testing resistance R2 with the other end of resistance R a2, the other end of resistance R s2 simultaneously.
The resistance of the resistance of resistance R s1 and resistance R s2 equates.
The resistance of the resistance of resistance R a1 and resistance R a2 equates.
The utility model is in the insulation resistance of measuring the lithium battery group, and simple in structure, measuring speed is fast, can reach 3% accuracy.
The accompanying drawing explanation
Fig. 1 is circuit connection diagram of the present utility model.
Embodiment
Embodiment one, in conjunction with Fig. 1, this embodiment is described, the lithium battery insulation resistance is at line detection circuit: it comprises resistance R s1, resistance R s2, resistance R a1, resistance R a2, a K switch 1 and No. two K switch 2;
The anodal of described lithium battery group Bat is connected with the end of resistance R a1, the end of resistance R s1 and the end of testing resistance R1 simultaneously; The other end of resistance R a1 is connected with the quiet end of a K switch 1; The moved end of a described K switch 1 is connected with the power end on electric chassis 1 with the quiet end of No. two K switch 2, the other end of resistance R s1, the end of resistance R s2, the other end of testing resistance R1, the end of testing resistance R2 simultaneously; The moved end of described No. two K switch 2 is connected with the end of resistance R a2; The negative pole of described lithium battery group Bat is connected with the other end of testing resistance R2 with the other end of resistance R a2, the other end of resistance R s2 simultaneously.
The described lithium battery insulation resistance of embodiment two, this embodiment and embodiment one is in the difference of line detection circuit, and the resistance of the resistance of resistance R s1 and resistance R s2 equates.
The described lithium battery insulation resistance of embodiment three, this embodiment and embodiment one or two is in the difference of line detection circuit, and the resistance of the resistance of resistance R a1 and resistance R a2 equates.
Principle of work: as shown in Figure 1: Bat is the lithium battery group, R
1the insulation resistance between positive master tape and electric chassis, R
2the insulation resistance between negative master tape and electric chassis, R
s1and R
s2the input impedance of testing circuit, R
a1and R
a2to detect biasing resistor, V
pand V
nit is the electromotive force on the relatively electric chassis of positive and negative master tape.
If R
s1=R
s2=R
s, R
a1=R
a2=R
a.Work as K switch
1closure, K
2during disconnection, record V
p=V
p1, V
n=V
n1; Work as K switch
2closure, K
1during disconnection, record V
p=V
p2, V
n=V
n2.R
1and R
2available following formula calculates:
R
1=R
sR
a(V
p1V
n2-V
p2V
n1)/[(V
p2V
n1-V
p1V
n2)R
a-(V
p1V
n2-V
n1V
n2)R
s]
R
2=-R
aR
sR
1V
n1/[V
p1(R
sR
1+R
aR
1+R
aR
s)+V
n1R
aR
1]
Circuit of the present utility model is for measuring the insulation resistance of lithium battery group, and simple in structure, measuring speed is fast, can reach 3% accuracy.The present invention is applicable to lithium battery management system.
Claims (3)
1. the lithium battery insulation resistance, at line detection circuit, is characterized in that: it comprises resistance R s1, resistance R s2, resistance R a1, resistance R a2, a switch (K1) and No. two switches (K2);
The anodal of described lithium battery group (Bat) is connected with the end of resistance R a1, the end of resistance R s1 and the end of testing resistance R1 simultaneously; The other end of resistance R a1 is connected with the quiet end of a switch (K1); The moved end of a described switch (K1) is connected with the power end of electric chassis (1) with the quiet end of No. two switches (K2), the other end of resistance R s1, the end of resistance R s2, the other end of testing resistance R1, the end of testing resistance R2 simultaneously; The moved end of described No. two switches (K2) is connected with the end of resistance R a2; The negative pole of described lithium battery group (Bat) is connected with the other end of testing resistance R2 with the other end of resistance R a2, the other end of resistance R s2 simultaneously.
2. lithium battery insulation resistance according to claim 1, at line detection circuit, is characterized in that the resistance of resistance R s1 and the resistance of resistance R s2 equate.
3. lithium battery insulation resistance according to claim 1 and 2, at line detection circuit, is characterized in that the resistance of resistance R a1 and the resistance of resistance R a2 equate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013204563957U CN203337736U (en) | 2013-07-29 | 2013-07-29 | Lithium battery insulation resistance online detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013204563957U CN203337736U (en) | 2013-07-29 | 2013-07-29 | Lithium battery insulation resistance online detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203337736U true CN203337736U (en) | 2013-12-11 |
Family
ID=49706403
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013204563957U Expired - Lifetime CN203337736U (en) | 2013-07-29 | 2013-07-29 | Lithium battery insulation resistance online detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203337736U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104569597A (en) * | 2014-12-18 | 2015-04-29 | 北京新能源汽车股份有限公司 | Insulation resistance detecting method and device for power battery |
| CN106291112A (en) * | 2016-10-27 | 2017-01-04 | 宁德时代新能源科技股份有限公司 | Insulation resistance detection circuit and method |
| CN106814294A (en) * | 2016-12-26 | 2017-06-09 | 浙江万马新能源有限公司 | Based on bilateral bridge direct-current charging post insulation detecting circuit and detection method |
-
2013
- 2013-07-29 CN CN2013204563957U patent/CN203337736U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104569597A (en) * | 2014-12-18 | 2015-04-29 | 北京新能源汽车股份有限公司 | Insulation resistance detecting method and device for power battery |
| CN106291112A (en) * | 2016-10-27 | 2017-01-04 | 宁德时代新能源科技股份有限公司 | Insulation resistance detection circuit and method |
| WO2018076816A1 (en) * | 2016-10-27 | 2018-05-03 | 宁德时代新能源科技股份有限公司 | Insulation resistance detection circuit and method |
| CN106291112B (en) * | 2016-10-27 | 2019-06-18 | 宁德时代新能源科技股份有限公司 | Insulation resistance detection circuit and method |
| CN106814294A (en) * | 2016-12-26 | 2017-06-09 | 浙江万马新能源有限公司 | Based on bilateral bridge direct-current charging post insulation detecting circuit and detection method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20131211 |