CN202330670U - Insulation detection circuit for power battery system of electric vehicle - Google Patents
Insulation detection circuit for power battery system of electric vehicle Download PDFInfo
- Publication number
- CN202330670U CN202330670U CN2011204983009U CN201120498300U CN202330670U CN 202330670 U CN202330670 U CN 202330670U CN 2011204983009 U CN2011204983009 U CN 2011204983009U CN 201120498300 U CN201120498300 U CN 201120498300U CN 202330670 U CN202330670 U CN 202330670U
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Abstract
The utility model provides an insulation detection circuit for a power battery system of an electric vehicle. The insulation detection circuit comprises a switch commutation circuit and a current sensor circuit, wherein the switch commutation circuit comprises a first switch, a first resistor, a second switch and a second resistor; one end of the first switch is connected with the total positive terminal of a battery pack; one end of the first resistor is connected to the other end of the first switch; one end of the second switch is connected with the total negative terminal of the battery pack; and one end of the second resistor is connected to the other end of the second switch, and the other end of the second resistor is connected to the other end of the first resistor. The current sensor circuit comprises a current sensor and a third resistor, wherein the third resistor is connected to the secondary side of the current sensor and is used for converting a current signal outputted by the secondary side of the current sensor into a voltage signal; and the current sensor comprises a first pin which is positioned on the primary side of the current sensor and is connected to nodal points of the first resistor and the second resistor and a second pin which is positioned on the primary side of the current sensor and is connected with a battery pack shell. The insulation detection circuit has the advantage of accurate and real-time detection.
Description
Technical field
The utility model relates to a kind of insulation testing circuit, particularly a kind of insulation testing circuit that is used for the power battery of electric vehicle system.
Background technology
The insulation detection technique is an important technology that concerns personal safety in the electric motor car.Vehicle-mounted working environment is complicated, and damage and destruction that the factors such as corrosion of vibrations and environment can cause insulation make decreasing insulating.When power supply positive and negative electrode lead-in wire constitutes the leakage current loop through insulation course and car body, will endanger vehicle and personal safety.Therefore, in order to guarantee the insulation safety of electric car on-vehicle battery group, must detect the insulation resistance of electric battery accurately and real-time to car body.
The utility model content
The purpose of the utility model is to provide the insulation testing circuit of a kind of power battery of electric vehicle system, its can precise real-time detection electric battery to the insulation resistance of car body.
To achieve these goals, the insulation testing circuit of the power battery of electric vehicle system that provides of the utility model comprises switch switching circuit and current sensor circuit.
Said switch switching circuit comprises: first switch, an end of said first switch are used for always just being connected with the electric battery of electrokinetic cell system; First resistance, an end of said first resistance is connected in the other end of said first switch; Second switch, an end of said second switch are used for being connected with the electric battery of electrokinetic cell system is always negative; And second resistance, an end of said second resistance is connected in the other end of said second switch, and the other end of said second resistance is connected in the other end of said first resistance.
Said current sensor circuit comprises: current sensor; And the 3rd resistance, be connected in the secondary of said current sensor, be used for converting the current signal of the secondary output of said current sensor into voltage signal.
Said current sensor comprises: first pin, be positioned at the former limit of said current sensor, and be connected in the node of said first resistance and said second resistance; And second pin, be positioned at the former limit of said current sensor, be used for being connected with the battery housing of electrokinetic cell system.
The beneficial effect of the utility model is following:
In the utility model; Two switches that switch switching circuit comprises make electric battery always just, always bear former limit independent and battery housing access current sensor respectively; The secondary output signal of current sensor is with the isolation of former limit and by its scale-up factor amplified current signal; Convert this current signal into analog voltage signal through a resistance, whereby, can calculate electric battery total just, total negative respectively to the insulation resistance of battery housing.It is thus clear that the utility model is suitable for and accurately detects the insulation resistance of electric battery to car body in real time.
In addition, form from structure and to see, the utility model simple in structure, cost is low and antijamming capability is strong.
Description of drawings
Fig. 1 is to be the circuit structure diagram when using according to the insulation testing circuit of the power battery of electric vehicle system of the utility model embodiment.
Wherein, description of reference numerals is following:
Total positive 12 battery housings, 13 electric battery of 11 electric battery are always negative
2 switch switching circuit, 3 current sensor circuit K1, first switch
K2 second switch R1 first resistance R 2 second resistance
R3 the 3rd resistance 31 current sensors 311 first pins
312 second pins
Embodiment
Below in conjunction with accompanying drawing and embodiment the utility model is explained further details.
Fig. 1 schematically shows the circuit structure of insulation testing circuit when using of the power battery of electric vehicle system of the utility model embodiment.
As shown in the figure, the insulation testing circuit of the power battery of electric vehicle system of present embodiment comprises switch switching circuit 2 and current sensor circuit 3.
One end of first K switch 1 is used for being connected with the electric battery total positive 11 of electrokinetic cell system; The end of second switch K2 is used for always bearing 13 with the electric battery of electrokinetic cell system and is connected; One end of first resistance R 1 is connected in the other end of first K switch 1; One end of second resistance R 2 is connected in the other end of second switch K2, and the other end of second resistance R 2 is connected in the other end of first resistance R 1.
The 3rd resistance R 3 is connected in the secondary of current sensor 31, is used for converting the current signal that the secondary of current sensor 31 is exported into voltage signal.
The below operation of the insulation testing circuit of the power battery of electric vehicle system of explanation present embodiment.
When the insulation that utilizes present embodiment to carry out the power battery of electric vehicle system detects; When first K switch, 1 closure and second switch K2 disconnection; Electric battery total positive 11 is passed through first resistance R 1 and is connected with first pin 311 on the former limit of current sensor 31; Electric battery always bears 13 through first pin 311 disconnections of second resistance R 2 with the former limit of current sensor 31, and battery housing 12 is connected with second pin 312 on the former limit of current sensor 31.The secondary of current sensor 31 output signal be and isolation of former limit and coefficient amplified current signal in proportion that this current signal converts an analog voltage signal into through the 3rd resistance R 3.
When 1 disconnection of first K switch and second switch K2 closure; Electric battery total positive 11 is broken off through first pin 311 of first resistance R 1 with the former limit of current sensor 31, and electric battery always negative 13 is connected with first pin 311 on the former limit of current sensor 31 through second resistance R 2; Battery housing 12 is connected with second pin 312 on the former limit of current sensor 31.The secondary of current sensor 31 output signal be and isolation of former limit and coefficient amplified current signal in proportion that this current signal converts another analog voltage signal into through the 3rd resistance R 3.
So far, according to the total voltage of electric battery and first resistance R 1, second resistance R 2 and two aanalogvoltages, the insulating resistance value that can calculate the total positive 11 pairs of battery housings 12 of electric battery and electric battery are always born the insulating resistance value of 13 pairs of battery housings 12.
To sum up, the utility model comprises switch switching circuit, current sensor circuit.Switch switching circuit comprises two switches, two switches make respectively that battery system is total just, battery system always negative separately with the former limit of battery housing access current sensor.Current sensor secondary output signal be and isolation of former limit and coefficient amplified current signal in proportion; Current signal converts analog voltage signal into through a resistance, and it is total just always negative respectively to the insulating resistance value of battery housing with electric battery to calculate electric battery whereby.It is thus clear that the utility model is simple in structure, cost is low, precise real-time detection and antijamming capability are strong, be applicable to the insulation resistance of real-time detection power battery of electric vehicle system.
In practical application, can outside the insulation testing circuit of the utility model, connect warning circuit again, to report to the police when electric battery total positive 11 or electric battery are always born 13 electric leakages when detecting, warning circuit can adopt techniques well known, repeats no more at this.
Can know that by technological general knowledge the utility model can be realized through other the embodiment that does not break away from its spirit or essential feature.Therefore, above-mentioned disclosed embodiment with regard to each side, all just illustrates, and is not only.All in the utility model scope or the change that is being equal in the scope of the utility model all comprised by the utility model.
Claims (1)
1. the insulation testing circuit of a power battery of electric vehicle system is characterized in that, comprises switch switching circuit and current sensor circuit;
Said switch switching circuit comprises:
First switch, an end of said first switch are used for always just being connected with the electric battery of electrokinetic cell system;
First resistance, an end of said first resistance is connected in the other end of said first switch;
Second switch, an end of said second switch are used for being connected with the electric battery of electrokinetic cell system is always negative;
Second resistance, an end of said second resistance is connected in the other end of said second switch, and the other end of said second resistance is connected in the other end of said first resistance;
Said current sensor circuit comprises:
Current sensor comprises: first pin, be positioned at the former limit of said current sensor, and be connected in the node of said first resistance and said second resistance; And second pin, be positioned at the former limit of said current sensor, be used for being connected with the battery housing of electrokinetic cell system; And
The 3rd resistance is connected in the secondary of said current sensor, is used for converting the current signal of the secondary output of said current sensor into voltage signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204983009U CN202330670U (en) | 2011-12-02 | 2011-12-02 | Insulation detection circuit for power battery system of electric vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204983009U CN202330670U (en) | 2011-12-02 | 2011-12-02 | Insulation detection circuit for power battery system of electric vehicle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202330670U true CN202330670U (en) | 2012-07-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011204983009U Expired - Lifetime CN202330670U (en) | 2011-12-02 | 2011-12-02 | Insulation detection circuit for power battery system of electric vehicle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202330670U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103278776A (en) * | 2013-05-10 | 2013-09-04 | 浙江吉利汽车研究院有限公司杭州分公司 | Electric automobile battery insulation detecting system |
| CN103454498A (en) * | 2013-08-08 | 2013-12-18 | 许继集团有限公司 | Insulation detection method of electric vehicle power battery pack |
| CN105548839A (en) * | 2015-12-22 | 2016-05-04 | 中国科学院深海科学与工程研究所 | Multichannel online detection underwater equipment insulation property system and method thereof |
| CN106405344A (en) * | 2016-08-23 | 2017-02-15 | 南京中港电力股份有限公司 | Dynamic battery insulation detecting system and the working method thereof |
-
2011
- 2011-12-02 CN CN2011204983009U patent/CN202330670U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103278776A (en) * | 2013-05-10 | 2013-09-04 | 浙江吉利汽车研究院有限公司杭州分公司 | Electric automobile battery insulation detecting system |
| CN103278776B (en) * | 2013-05-10 | 2016-01-27 | 浙江吉利汽车研究院有限公司杭州分公司 | A kind of batteries of electric automobile Insulation Inspection System |
| CN103454498A (en) * | 2013-08-08 | 2013-12-18 | 许继集团有限公司 | Insulation detection method of electric vehicle power battery pack |
| CN105548839A (en) * | 2015-12-22 | 2016-05-04 | 中国科学院深海科学与工程研究所 | Multichannel online detection underwater equipment insulation property system and method thereof |
| CN106405344A (en) * | 2016-08-23 | 2017-02-15 | 南京中港电力股份有限公司 | Dynamic battery insulation detecting system and the working method thereof |
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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 |
Granted publication date: 20120711 |
|
| CX01 | Expiry of patent term |