CN202362420U - Circuit for testing insulating properties between lithium battery and battery casing in electric automobile - Google Patents
Circuit for testing insulating properties between lithium battery and battery casing in electric automobile Download PDFInfo
- Publication number
- CN202362420U CN202362420U CN2011204379714U CN201120437971U CN202362420U CN 202362420 U CN202362420 U CN 202362420U CN 2011204379714 U CN2011204379714 U CN 2011204379714U CN 201120437971 U CN201120437971 U CN 201120437971U CN 202362420 U CN202362420 U CN 202362420U
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- battery
- constant current
- circuit
- current source
- battery case
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- Expired - Lifetime
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Abstract
The utility model discloses a circuit for testing insulating properties between a lithium battery and a battery casing in an electric automobile, characterized by comprising a constant current source generating circuit, a constant current source program control circuit, an MCU control circuit, a man-machine interface, battery positive and negative poles, a battery casing and a control relay. The MCU control circuit sends instructions to the constant current source program control circuit to control the constant current source generating circuit; the constant current source generating circuit generates constant current which through the control relay passes through the battery positive and negative poles and a virtual resistor formed by the battery casing; insulation resistance between the lithium battery and the battery casing can be calculated by measuring the voltage on two ends of the virtual resistor. The circuit of the utility model has a simple structure, adjustable measuring precision and low costs.
Description
Technical field
The utility model relates to the technical field of insulativity test, relates in particular in the electric automobile insulativity test circuit between the lithium battery and Battery case.
Background technology
Electric automobile is the industry of just rising in recent years, and global energy crisis and problem of environmental pollution are more and more outstanding in recent years, and the environmental protection electric automobile that replaces burns gasoline will be come into huge numbers of families.Lithium battery group as power in electric automobile must have the complete battery management system of a cover; Be used for charging, the discharge of battery are protected; And battery monitored in the situation of vehicle ' process; Wherein the insulativity between electric battery and the Battery case is must monitoring important one, and it will be related to the safety of battery and car load.
Because the electric automobile industry has just begun starting; Each producer also is in the starting stage to the research of battery management system, thereby to the method for testing of insulativity between electric battery and the Battery case also imperfection, present only method is to be employed in to add a voltage between 2; Measure electric current with special-purpose electric current computation chip again; Its outside components and parts are many, complicated circuit, and cost is high.
Summary of the invention
The utility model purpose is to provide in a kind of electric automobile the circuit of insulativity test between the lithium battery and Battery case.
The utility model adopts following technical scheme for realizing above-mentioned purpose:
The test circuit of lithium battery and Battery case insulativity in a kind of electric automobile, it is characterized in that: it comprises the constant current source generating circuit, constant current source programme control circut, MCU control circuit, man-machine interface, the both positive and negative polarity of battery, Battery case and pilot relay; Wherein
Said constant current source generating circuit is connected to reference voltage Vref, is used to produce steady current;
Said constant current source programme control circut inside has a series of different feedback circuits and gating switch, is used to control said constant current source generating circuit and produces different steady currents;
Said MCU control circuit includes A/D convertor circuit; And send instruction; Be used to control the switch and the break-make of controlling said pilot relay of said constant current source programme control circut gating needs, its inner A/D convertor circuit is gathered measurement to the electrode of said battery and the voltage at virtual resistance two ends of Battery case composition simultaneously;
Said man-machine interface is accepted the input of outer bound pair systematic parameter and is set (such as the bad alarming value of insulating property), and shows the data of said MCU control circuit output;
The both positive and negative polarity of said battery, Battery case is formed a virtual resistance;
Said pilot relay is used to control the flow through both positive and negative polarity of said battery of said constant current source generating circuit output current Iout, the virtual resistance that Battery case is formed.
The utility model is used for insulativity between lithium battery and the Battery case is tested, and simple in structure, and measuring accuracy is adjustable, and cost is lower.
Description of drawings
Fig. 1 is the utility model circuit block diagram.
Embodiment
The test circuit of lithium battery and Battery case insulativity in a kind of electric automobile as shown in Figure 1, it comprises constant current source generating circuit 101, constant current source programme control circut 102; MCU control circuit 103; Man-machine interface 104, the both positive and negative polarity 105 of battery, Battery case 106 and pilot relay SW1; Wherein
Said constant current source generating circuit 101 is connected to reference voltage Vref, is used to produce steady current;
Said constant current source programme control circut 102 inside have a series of different feedback circuits and gating switch, are used to control said constant current source generating circuit 101 and produce different steady currents;
Said MCU control circuit 103 includes A/D convertor circuit; And send instruction; Be used to control the switch and the break-make of controlling said pilot relay SW1 of said constant current source programme control circut 102 gating needs, its inner A/D convertor circuit is gathered measurement to the electrode 105 of said battery with the voltage that Battery case 106 is formed virtual resistance RL two ends simultaneously;
(such as the bad alarming value of insulating property) set in the input that outer bound pair systematic parameter is accepted in said man-machine interface 104, and shows the data of said MCU control circuit 103 outputs;
The both positive and negative polarity 105 of said battery, Battery case 106 is formed a virtual resistance RL;
Said pilot relay SW1 is used to control the flow through both positive and negative polarity 105 of said battery of said constant current source generating circuit 101 output current Iout, the virtual resistance RL that Battery case 106 is formed.
After the Vref reference voltage is certain; The size of current that constant current source generating circuit 101 produces only receives 102 controls of constant current source programme control circut; Constant current source programme control circut 102 inside are a series of different feedback circuits and gating switch, send instruction according to the needs of subsequent conditioning circuit by MCU control circuit 103, the switch that control constant current source programme control circut 102 gatings need; Make constant current source generating circuit 101 produce needed electric current, the measuring accuracy that different electric currents is different with correspondence.
MCU control circuit 103 is control chips of total system; When lithium battery and Battery case insulativity need be measured by system; MCU control circuit 103 pilot relay SW1 produce the negative or positive electrode 105 that electric current is switched to battery with constant current source generating circuit 101; The ground wire that to measure the loop simultaneously is switched to Battery case 106, can regard a virtual resistance R L as between the positive pole of battery (or negative pole) 105 and the Battery case 106, when insulating fully between positive pole (or the negative pole) 105 of battery and the Battery case 106; Virtual resistance RL is infinity; When between positive pole (or the negative pole) 105 of battery and the Battery case 106 during short circuit, virtual resistance RL is zero, and the virtual RL of other situation will be concrete numerical value.According to Ohm law; RL=Vout ÷ Iout is for flowing through the constant electric current I out of virtual RL, when measuring virtual RL voltage Vout; Can calculate virtual resistance RL, promptly can reflect the situation of insulativity between positive pole (or negative pole) 105 and the Battery case 106 of battery.
According to above-mentioned principle; When lithium battery and Battery case insulativity need be measured by system; The voltage of test point in the circuit " A " point will be carried out analysis and judgement and processing through after the computing test result being sent to man-machine interface 104 by the A/D convertor circuit collection of MCU control circuit 103.
The effect of SW1 switch is only when measuring, this circuit to be received on battery and the battery case, breaks off immediately after measurement is accomplished, and prevents to produce when other parts are measured in battery management system interference.
Claims (1)
1. the test circuit of lithium battery and Battery case insulativity in the electric automobile; It is characterized in that: it comprises constant current source generating circuit (101); Constant current source programme control circut (102), MCU control circuit (103), man-machine interface (104); The both positive and negative polarity of battery (105), Battery case (106) and pilot relay (SW1); Wherein
Said constant current source generating circuit (101) is connected to reference voltage Vref, is used to produce steady current;
Said constant current source programme control circut (102) inside has a series of different feedback circuits and gating switch, is used to control said constant current source generating circuit (101) and produces different steady currents;
Said MCU control circuit (103) includes A/D convertor circuit; And send instruction; Be used to control the switch and the break-make of controlling said pilot relay (SW1) of said constant current source programme control circut (102) gating needs, its inner A/D convertor circuit is gathered measurement to the electrode (105) of said battery with the voltage that Battery case (106) is formed a virtual resistance (RL) two ends simultaneously;
Said man-machine interface (104) is accepted the input of outer bound pair systematic parameter and is set, and shows the data of said MCU control circuit (103) output;
The both positive and negative polarity of said battery (105), Battery case (106) is formed a virtual resistance (RL);
Said pilot relay (SW1) is used to control the flow through both positive and negative polarity (105) of said battery of said constant current source generating circuit (101) output current Iout, the virtual resistance (RL) that Battery case (106) is formed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204379714U CN202362420U (en) | 2011-11-08 | 2011-11-08 | Circuit for testing insulating properties between lithium battery and battery casing in electric automobile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204379714U CN202362420U (en) | 2011-11-08 | 2011-11-08 | Circuit for testing insulating properties between lithium battery and battery casing in electric automobile |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202362420U true CN202362420U (en) | 2012-08-01 |
Family
ID=46573598
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011204379714U Expired - Lifetime CN202362420U (en) | 2011-11-08 | 2011-11-08 | Circuit for testing insulating properties between lithium battery and battery casing in electric automobile |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202362420U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105510839A (en) * | 2015-12-22 | 2016-04-20 | 盐城工学院 | Electric vehicle battery insulation measurement circuit |
| CN114096858A (en) * | 2019-09-06 | 2022-02-25 | 株式会社Lg新能源 | Apparatus and method for diagnosing insulation resistance value measuring circuit |
-
2011
- 2011-11-08 CN CN2011204379714U patent/CN202362420U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105510839A (en) * | 2015-12-22 | 2016-04-20 | 盐城工学院 | Electric vehicle battery insulation measurement circuit |
| CN105510839B (en) * | 2015-12-22 | 2020-05-05 | 盐城工学院 | Battery insulation measuring circuit of electric automobile |
| CN114096858A (en) * | 2019-09-06 | 2022-02-25 | 株式会社Lg新能源 | Apparatus and method for diagnosing insulation resistance value measuring circuit |
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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: 20120801 |