CN203191449U - Insulation monitor for power battery of electric automobile - Google Patents
Insulation monitor for power battery of electric automobile Download PDFInfo
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- CN203191449U CN203191449U CN 201320226909 CN201320226909U CN203191449U CN 203191449 U CN203191449 U CN 203191449U CN 201320226909 CN201320226909 CN 201320226909 CN 201320226909 U CN201320226909 U CN 201320226909U CN 203191449 U CN203191449 U CN 203191449U
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Abstract
The utility model discloses an insulation monitor for a power battery of an electric automobile. The insulation monitor for the power battery of the electric automobile includes a power source module, an insulating resistance measuring module, a microcontroller, a sound-light alarm module and a display module. The power source module is connected with the insulating resistance measuring module, the microcontroller, the sound-light alarm module and the display module and provides working power. The insulating resistance measuring module is connected with a positive electrode and a negative electrode of the power battery, a vehicle chassis and the microcontroller. The sound-light alarm module is connected with the microcontroller. The display module is connected with the microcontroller. The insulation monitor for the power battery of the electric automobile is installed on the electric automobile and can provide insulation information of the power battery timely and accurately in a driving process or a maintaining process of the electric automobile.
Description
Technical field
The utility model relates to a kind of insulating monitoring instrument of electric automobile power battery group, and the positive and negative electrode that is used for monitoring electric automobile power battery group is respectively to the insulation resistance of vehicle chassis.
Background technology
Electric automobile is the electromechanical integrated product of a complexity, and many parts wherein comprise that electrokinetic cell, motor, charging set, energy recycle device, boosting battery charging device etc. all can relate to the High-Voltage Electrical Appliances Insulation Problems.The condition of work of these parts is more abominable, vibration, the burn into temperature of soda acid gas and the variation of humidity, all might cause power cable and other insulating material aging even damage in insulation rapidly, apparatus insulated intensity is reduced greatly, bring the danger of electric shock for use, maintenance personal.
The insulating monitoring technology of place high direct voltage systems such as generation current factory, transformer station has multiple mode, but all there are some shortcomings, low as the sensitivity of relay detection mode, balanced bridge method can not accurately and timely be reported to the police when reducing simultaneously in the both positive and negative polarity insulation, injecting the AC signal method not only can make the straight-flow system ripple increase, influence power supply quality, and the distributed capacitance of system can directly influence measurement result, resolution is low.Different with the monitoring of electric system D.C. isolation is that electric automobile straight-flow system electric pressure contains the wide region of 60～500V, and voltage frequent variations in the operational process; If these insulating monitoring technology are used on the electric automobile, its dynamic, visuality and real-time are relatively poor, are difficult to obtain in time, accurately the insulation information of power battery pack; Whether be in the electric leakage state if adopt the insulation resistance detection method of traditional power battery pack can only judge current power battery pack, can not judge power battery pack is anodal electric leakage or negative pole electric leakage or bipolar electric leakage simultaneously, nor can accurately measure the electric leakage degree of power battery pack, there is potential safety hazard, is unfavorable for the popularization of whole electric automobile industry.
Summary of the invention
The purpose of this utility model provides a kind of insulating monitoring instrument of electric automobile power battery group, be installed on the electric automobile, in electric automobile during traveling or in the maintenance, obtain the insulation information (being that the positive and negative electrode of power battery pack is respectively to the insulating resistance value of vehicle chassis) of power battery pack in time, accurately.
The insulating monitoring instrument of electric automobile power battery group described in the utility model, comprise power module, the insulation measurement module, microcontroller, sound and light alarm module and display module, described power module and insulation measurement module, microcontroller, the sound and light alarm module, display module connects, working power is provided, the positive pole of described insulation measurement module and power battery pack, negative pole, vehicle chassis and microcontroller connect, under the control of microcontroller, measure the voltage parameter that is associated with the insulation resistance of the relative vehicle chassis of both positive and negative polarity of power battery pack, and it is sent in the microcontroller handle, described sound and light alarm module is connected with microcontroller, when the insulating resistance value of measuring is unusual, send sound and light alarm, described display module is connected with microcontroller, shows the insulating resistance value of measuring under the control of microcontroller.
Further, described insulating monitoring instrument also comprises the communication module that sends PC for the insulating resistance value that will measure to, and this communication module is connected with microcontroller with power module, and PC carries out remote monitoring to insulating resistance value in real time.
Further; described insulation measurement module is by filtering and protected location; sample resistance unit and voltage signal processing unit constitute; the input end of described filtering and protected location and the positive pole of power battery pack; negative pole is connected with vehicle chassis; the output terminal of filtering and protected location is connected with the input end of sample resistance unit; the control end of sample resistance unit is connected with the switching signal control end of microcontroller; the output terminal of sample resistance unit is connected with the input end of voltage signal processing unit, and the output terminal of voltage signal processing unit is connected with the voltage signal input end of microcontroller.
Further, described sample resistance unit is by first, second, the 3rd electronic switch and the 3rd, the 4th, the 5th, the 6th, the 7th, the 8th resistance constitutes, first switching signal control end of the control termination microcontroller of first electronic switch, the input termination filtering of first electronic switch and the cathode output end of protected location, one end of output termination the 5th resistance of first electronic switch, one end of another termination the 7th resistance of the 5th resistance, one end of another termination the 3rd resistance of the 7th resistance, another termination vehicle chassis of the 3rd resistance, the tie point of the 3rd resistance and the 7th resistance connect an input end of voltage signal processing unit; Second switching signal control end of the control termination microcontroller of second electronic switch, the input termination filtering of second electronic switch and the cathode output end of protected location, one end of output termination the 6th resistance of second electronic switch and an end of the 8th resistance, one end of another termination the 4th resistance of the 8th resistance, another termination vehicle chassis of the 4th resistance, another termination vehicle chassis of the 6th resistance, the tie point of the 4th resistance and the 8th resistance connects another input end of voltage signal processing unit; The 3rd switching signal control end of the control termination microcontroller of the 3rd electronic switch, input termination the 5th resistance of the 3rd electronic switch and the tie point of the 7th resistance, the output termination vehicle chassis of the 3rd electronic switch.
Further, described first, second electronic switch is isolated form switch (such as optocoupler, relay etc.), and the 3rd electronic switch is triode or field effect transistor.
Its observation process is as follows:
The voltage parameter that the collection of microprocessor controls insulation measurement module and the insulation resistance of the relative vehicle chassis of both positive and negative polarity of power battery pack are associated, and it is sent in the microcontroller handle, microcontroller calculates insulating resistance value, judge whether state is unusual, and the insulating resistance value of measuring shown by display module, also can send the insulating resistance value of measuring to long-range PC by communication module, when the insulating resistance value of measuring was unusual, the sound and light alarm module was sent sound and light alarm.
Insulating monitoring instrument dynamic described in the utility model, visuality and real-time are better, are installed on the electric automobile, can obtain the insulation information of power battery pack in time, accurately, and have higher precision, are adapted at fully applying on the electric automobile.
Description of drawings
Fig. 1 is circuit block diagram of the present utility model.
Fig. 2 is measuring principle initial model figure of the present utility model.
Fig. 3 is the circuit connection diagram of insulation measurement module and power battery pack and microcontroller in the utility model.
Fig. 4 is the circuit theory diagrams of the sample resistance unit of insulation measurement module in the utility model.
Embodiment
The utility model is described in further detail below in conjunction with accompanying drawing.
The insulating monitoring instrument of electric automobile power battery group as shown in Figure 1, comprise power module 1, insulation measurement module 2, microcontroller 3, sound and light alarm module 4, display module 5 and communication module 6, power module 1 and insulation measurement module 2, microcontroller 3, sound and light alarm module 4, display module 5, communication module 6 connects, working power is provided, the positive pole of insulation measurement module 2 and power battery pack, negative pole, vehicle chassis and microcontroller 3 connect, under the control of microcontroller 3, measure the voltage parameter that is associated with the insulation resistance of the relative vehicle chassis of both positive and negative polarity of power battery pack, and it is sent in the microcontroller 3 handle, sound and light alarm module 4 is connected with microcontroller 3, when the insulating resistance value of measuring is unusual, send sound and light alarm, display module 5 is connected with microcontroller 3, under the control of microcontroller 3, show the insulating resistance value of measuring, communication module 6 is connected with microcontroller 3, under the control of microcontroller 3, send the insulating resistance value of measuring to PC 7, PC 7 carries out remote monitoring to insulating resistance value in real time, communication module 6 can be radio communication, also can be wire communication.
As Fig. 3; shown in Figure 4; insulation measurement module 2 is by filtering and protected location 21; sample resistance unit 22 and voltage signal processing unit 23 constitute; described sample resistance unit 22 is by the first electronic switch SW1; the second electronic switch SW2; the 3rd electronic switch SW3; the 3rd resistance R 3; the 4th resistance R 4; the 5th resistance R 5; the 6th resistance R 6; the 7th resistance R 7 and the 8th resistance R 8 constitute; the first electronic switch SW1 and the second electronic switch SW2 adopt optocoupler (also can adopt relay), and the 3rd electronic switch SW3 adopts NPN type triode (also can adopt positive-negative-positive triode or metal-oxide-semiconductor field effect transistor).The electrode input end of filtering and protected location 21 is connected with vehicle chassis with the positive pole of power battery pack, the negative input of filtering and protected location 21 is connected with vehicle chassis with the negative pole of power battery pack, control end 1 pin of the first electronic switch SW1 connects first switching signal control end (being microcontroller 3 first switch controlling signals of output) of microcontroller 3,2 pin connect vehicle chassis, input end 4 pin of the first electronic switch SW1 connect the cathode output end of filtering and protection mould 21, output terminal 3 pin of the first electronic switch SW1 connect an end of the 5th resistance R 5, one end of another termination the 7th resistance R 7 of the 5th resistance R 5, one end of another termination the 3rd resistance R 3 of the 7th resistance R 7, another termination vehicle chassis of the 3rd resistance R 3, the tie point of the 3rd resistance R 3 and the 7th resistance R 7 connect an input end of voltage signal processing unit 23; Control end 1 pin of the second electronic switch SW2 connects second switching signal control end (being second switch controlling signal of microcontroller 3 outputs) of microcontroller 3,2 pin connect vehicle chassis, input end 4 pin of the second electronic switch SW2 connect the cathode output end of filtering and protected location 21, output terminal 3 pin of the second electronic switch SW2 connect an end of the 6th resistance R 6 and an end of the 8th resistance R 8, one end of another termination the 4th resistance R 4 of the 8th resistance R 8, another termination vehicle chassis of the 4th resistance R 4, another termination vehicle chassis of the 6th resistance R 6, the tie point of the 4th resistance R 4 and the 8th resistance R 8 connects another input end of voltage signal processing unit 23; The control end base stage of the 3rd electronic switch SW3 connects the 3rd the switching signal control end (being the 3rd switch controlling signals of microcontroller 3 outputs) of microcontroller 3, the input end collector of the 3rd electronic switch SW3 connects the tie point of the 5th resistance R 5 and the 7th resistance R 7, the output terminal emitter of the 3rd electronic switch SW3 connects vehicle chassis, an output terminal of voltage signal processing unit 23 is connected with a voltage signal input end of microcontroller 3, and another output terminal of voltage signal processing unit 23 is connected with another voltage signal input end of microcontroller 3.
Its observation process is as follows:
Its measuring principle is as follows:
E in the frame of broken lines of Fig. 2 is power battery pack (being the high voltage power accumulator), first resistance R 1 is this power battery pack positive pole insulation resistance model abstract to vehicle chassis, and second resistance R 2 is this power battery pack negative pole insulation resistance module abstract to vehicle chassis; Sample resistance RA, sample resistance RB are known resistance; Can to establish U1 be first resistance R, 1 both end voltage to model thus, U2 is second resistance R, 2 both end voltage, make that G1 is that admittance, the G2 of first resistance R 1 is the admittance of second resistance R 2, Ga is that admittance, the Gb of sample resistance RA is the admittance of sample resistance RB, is Kirchhoff's law according to KCL, KVL() can get following equation:
U1*（G1+Ga）=U2*（G2+Gb） （1）
Sample resistance RA, RB then can produce another prescription journey if change, if the time that sample resistance changes is enough fast, and E changes little, then can only change among sample resistance RA, the RB, make the value of sample resistance RA become RA ＇, then Ga ＇ is the admittance of sample resistance RA ＇
This moment, U1 ＇ was that first resistance R, 1 both end voltage, U2 ＇ are second resistance R, 2 both end voltage, the same getting:
U1＇*（G1+Ga＇）=U2＇*（G2+Gb） （2）
Can be got by (1)/(2):
（U1*U2＇）/（U1＇*U2）= （G1+Ga＇）/（G1+Ga） （3）
Make K=(U1*U2 ＇)/(U1 ＇ * U2), wherein U1 ＇=E-U2 ＇=U1+U2-U2 ＇ (4)
K is brought in (3) and can get:
G1=（Ga＇－K*Ga）/（K-1） （5）
(5) are brought in (1) and can be got:
G2=U1*（Ga＇- Ga）/ U2*（K-1）- Gb （6）
Because the data-handling capacity of microcontroller is limited, in order to guarantee the measuring accuracy in measurement range, expresses the feature of formula and design as shown in Figure 3, Figure 4 sample resistance unit in conjunction with above insulation resistance.Wherein, the first electronic switch SW1, the second electronic switch SW2 are used for connecting/disconnect being connected of insulation measurement module 2 and power battery pack positive pole, negative pole, and the 3rd electronic switch SW3 is used for controlling the change of the resistance in the sample resistance unit; When the 3rd electronic switch SW3 disconnects, the 3rd resistance R 3, the 5th resistance R 5, the 7th resistance R 7 sums are above-mentioned sample resistance RA, the 4th resistance R 4, be used for guaranteeing when second resistance R 2 is very big for above-mentioned sample resistance RB(the 6th resistance R 6 after the 6th resistance R 6 in the 8 sum parallel connections of the 8th resistance R, do not influence the measuring accuracy of first resistance R 1), therefore, the 3rd resistance R 3 both end voltage are the U1 voltage after partial, the 4th resistance R 4 both end voltage are the U2 voltage after partial, and microcontroller 3 is by measuring the 3rd resistance R 3 both end voltage, the 4th resistance R 4 both end voltage are calculated U1, the value of U2; When the 3rd electronic switch SW3 connected, the 5th resistance R 5 was above-mentioned sample resistance RA ＇; Microcontroller 3 calculates the value of U2 ＇ by measuring the 4th resistance R 4 both end voltage; The U1 that utilization calculates, U2, U2 ＇ bring equation (4), (5), (6) into, calculating the first resistance R 1(is that the power battery pack positive pole is with respect to the insulation resistance of vehicle chassis) admittance G1, the second resistance R 2(be that the power battery pack negative pole is with respect to the insulation resistance of vehicle chassis) admittance G, the inverse of getting G1 is the value of first resistance R 1, and the inverse of getting G2 is the value of second resistance R 2.
Claims (5)
1. the insulating monitoring instrument of an electric automobile power battery group, it is characterized in that: comprise power module (1), insulation measurement module (2), microcontroller (3), sound and light alarm module (4) and display module (5), described power module (1) and insulation measurement module, microcontroller, the sound and light alarm module, display module connects, working power is provided, the positive pole of described insulation measurement module (2) and power battery pack, negative pole, vehicle chassis and microcontroller connect, under the control of microcontroller, measure the voltage parameter that is associated with the insulation resistance of the relative vehicle chassis of both positive and negative polarity of power battery pack, and it is sent in the microcontroller handle, described sound and light alarm module (4) is connected with microcontroller (3), when the insulating resistance value of measuring is unusual, send sound and light alarm, described display module (5) is connected with microcontroller (3), shows the insulating resistance value of measuring under the control of microcontroller.
2. the insulating monitoring instrument of electric automobile power battery group according to claim 1, it is characterized in that: also comprise the communication module (6) that sends PC (7) for the insulating resistance value that will measure to, this communication module is connected with microcontroller (3) with power module (1).
3. the insulating monitoring instrument of electric automobile power battery group according to claim 1 and 2; it is characterized in that: described insulation measurement module (2) is by filtering and protected location (21); sample resistance unit (22) and voltage signal processing unit (23) constitute; the input end of described filtering and protected location (21) and the positive pole of power battery pack; negative pole is connected with vehicle chassis; the output terminal of filtering and protected location is connected with the input end of sample resistance unit (22); the control end of sample resistance unit is connected with the switching signal control end of microcontroller (3); the output terminal of sample resistance unit is connected with the input end of voltage signal processing unit (23), and the output terminal of voltage signal processing unit is connected with the voltage signal input end of microcontroller (3).
4. the insulating monitoring instrument of electric automobile power battery group according to claim 3, it is characterized in that: described sample resistance unit (22) is by first, second, the 3rd electronic switch (SW1, SW2, SW3) and the 3rd, the 4th, the 5th, the 6th, the 7th, the 8th resistance (R3, R4, R5, R6, R7, R8) constitute, first switching signal control end of the control termination microcontroller (3) of first electronic switch (SW1), the cathode output end of the input termination filtering of first electronic switch (SW1) and protected location (21), one end of output termination the 5th resistance (R5) of first electronic switch (SW1), one end of another termination the 7th resistance (R7) of the 5th resistance (R5), one end of another termination the 3rd resistance (R3) of the 7th resistance (R7), another termination vehicle chassis of the 3rd resistance (R3), the tie point of the 3rd resistance (R3) and the 7th resistance (R7) connects an input end of voltage signal processing unit (23); Second switching signal control end of the control termination microcontroller (3) of second electronic switch (SW2), the cathode output end of the input termination filtering of second electronic switch (SW2) and protected location (21), one end of output termination the 6th resistance (R6) of second electronic switch (SW2) and an end of the 8th resistance (R8), one end of another termination the 4th resistance (R4) of the 8th resistance (R8), another termination vehicle chassis of the 4th resistance (R4), another termination vehicle chassis of the 6th resistance (R6), the tie point of the 4th resistance (R4) and the 8th resistance (R8) connects another input end of voltage signal processing unit (23); The 3rd switching signal control end of the control termination microcontroller (3) of the 3rd electronic switch (SW3), input termination the 5th resistance (R5) of the 3rd electronic switch (SW3) and the tie point of the 7th resistance (R7), the output termination vehicle chassis of the 3rd electronic switch (SW3).
5. the insulating monitoring instrument of electric automobile power battery group according to claim 4, it is characterized in that: described first, second electronic switch (SW1, SW2) is the isolated form switch, and the 3rd electronic switch (SW3) is triode or field effect transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320226909 CN203191449U (en) | 2013-04-28 | 2013-04-28 | Insulation monitor for power battery of electric automobile |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201320226909 CN203191449U (en) | 2013-04-28 | 2013-04-28 | Insulation monitor for power battery of electric automobile |
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| CN203191449U true CN203191449U (en) | 2013-09-11 |
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| CN 201320226909 Expired - Fee Related CN203191449U (en) | 2013-04-28 | 2013-04-28 | Insulation monitor for power battery of electric automobile |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104502712A (en) * | 2014-11-13 | 2015-04-08 | 重庆小康工业集团股份有限公司 | Insulation detection control device and control method for electric automobile power system |
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2013
- 2013-04-28 CN CN 201320226909 patent/CN203191449U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104502712A (en) * | 2014-11-13 | 2015-04-08 | 重庆小康工业集团股份有限公司 | Insulation detection control device and control method for electric automobile power system |
| CN104502712B (en) * | 2014-11-13 | 2017-10-24 | 重庆小康工业集团股份有限公司 | A kind of power system of electric automobile Insulation monitoring control device and control method |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130911 Termination date: 20210428 |