CN103033729B - For insulation detecting circuit and the detection method thereof of battery case - Google Patents
For insulation detecting circuit and the detection method thereof of battery case Download PDFInfo
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- CN103033729B CN103033729B CN201210488389.XA CN201210488389A CN103033729B CN 103033729 B CN103033729 B CN 103033729B CN 201210488389 A CN201210488389 A CN 201210488389A CN 103033729 B CN103033729 B CN 103033729B
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Abstract
The invention discloses a kind of insulation detecting circuit for battery case and detection method thereof, comprise multiple power brick be cascaded; Wherein, described battery case shell leads to detection of electrical leakage end, the positive terminal of described battery case, detection of electrical leakage end and sampling resistor R2 are connected to form the first leakage detecting circuit, and the negative pole end of described battery case, detection of electrical leakage end and sampling resistor R2 ' are connected to form the second leakage detecting circuit; Described sampling resistor R2, R2 ' double-end voltage terminal is connected with MCU module through multidiameter option switch, operational amplifier, ADC module successively.Insulation detecting circuit for battery case provided by the invention and detection method thereof, utilize high value precision resistance R2 and R2 ' to carry out dividing potential drop measurement to battery two-way leakage detecting circuit, thus carry out effective monitoring in real time to the insulation situation of battery.
Description
Technical field
The present invention relates to a kind of battery case testing circuit and detection method thereof, particularly relate to a kind of insulation detecting circuit for battery case and detection method thereof.
Background technology
Battery management system (BatteryManagementSystem, be called for short BMS) be tie between battery and user, main object is secondary cell.There are some shortcomings below in secondary cell, as few in stored energy, the life-span is short, connection in series-parallel uses problem, safety in utilization, battery electric quantity estimation difficulty etc.The performance of battery is that very complicated, dissimilar battery behavior also differs greatly.Battery management system (BMS) is exactly mainly the utilization factor in order to improve battery, prevents battery from occurring overcharge and overdischarge, extends the serviceable life of battery, the state of monitoring battery.
Current battery case does not generally have insulation-monitoring function, can not detect the change of the insulation situation of battery case in real time and dynamically, be unfavorable for the safe handling of battery case.Therefore, the insulation detecting circuit and the detection method thereof that are provided for battery case is necessary.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of insulation detecting circuit for battery case and detection method thereof, can carry out effective monitoring in real time to the insulation situation of battery.
The present invention solves the problems of the technologies described above the technical scheme adopted to be to provide a kind of insulation detecting circuit for battery case, comprises multiple power brick be cascaded; Wherein, described battery case shell leads to detection of electrical leakage end, the positive terminal of described battery case, detection of electrical leakage end and sampling resistor R2 are connected to form the first leakage detecting circuit, and the negative pole end of described battery case, detection of electrical leakage end and sampling resistor R2 ' are connected to form the second leakage detecting circuit; Described sampling resistor R2, R2 ' double-end voltage terminal is connected with MCU module through multidiameter option switch, operational amplifier, ADC module successively.
The above-mentioned insulation detecting circuit for battery case, wherein, described sampling resistor R2 and loop resistance R1, isolation resistance R3, K switch m are cascaded formation first voltage sampling loop; These two ends, the first voltage sampling loop are parallel with K switch p; Described sampling resistor R2 ' and loop resistance R1 ', isolation resistance R3 ' are cascaded formation second voltage sampling loop; These two ends, the second voltage sampling loop are parallel with K switch q.
The present invention also provides a kind of detection method of the insulation detecting circuit for battery case for solving the problems of the technologies described above, wherein, comprise the steps: a) closed Km, disconnect Kp and Kq, switch multidiameter option switch to the first leakage detecting circuit A, measure A road voltage, be designated as VA0; Through operational amplifier and ADC resume module, deliver to MCU module; B) switch multidiameter option switch to the second leakage detecting circuit B, measure B road voltage, be designated as VB0; Through operational amplifier and ADC resume module, deliver to MCU module; C) closed Km and Kp, disconnects Kq, switches multidiameter option switch to the first leakage detecting circuit A, continues to measure A road voltage, is designated as VA1; Through operational amplifier and ADC resume module, deliver to MCU module; D) switch multidiameter option switch to the second leakage detecting circuit B, continue to measure B road voltage, be designated as VB1; Through operational amplifier and ADC resume module, deliver to MCU module; E) closed Km and Kq, disconnects Kp, switches multidiameter option switch to the first leakage detecting circuit A, continues to measure A road voltage, is designated as VA2; Through operational amplifier and ADC resume module, deliver to MCU module; F) switch multidiameter option switch to the second leakage detecting circuit B, continue to measure B road voltage, be designated as VB2; Through operational amplifier and ADC resume module, deliver to MCU module; G) according to the resistance of VA0, VA1, VA2 and R1-R3, anode is calculated to the equivalent insulation resistance R7 of housing; According to the resistance of VB0, VB1, VB2 and R1 '-R3 ', calculate battery cathode to the resistance value of the equivalent insulation resistance R8 of housing.
The detection method of the above-mentioned insulation detecting circuit for battery case, wherein, when measurement voltage signal VA0, VB0, VA1, VB1, VA2, VB2, each voltage signal continuous sampling N time, N is natural number, any sampled signal once exceedes reasonable voltage then resampling, and the difference between N continuous time sampled value is less than predetermined error range, then confirm this sampling effectively.
The detection method of the above-mentioned insulation detecting circuit for battery case, wherein, sampling number is 3 times.
The detection method of the above-mentioned insulation detecting circuit for battery case, wherein, the detection of electrical leakage end of described battery case is by electronic switch K1 and sampling resistor R2, R2 ' be connected, and described electronic switch K1 only just closes when carrying out insulation measurement.
The present invention contrasts prior art following beneficial effect: the insulation detecting circuit for battery case provided by the invention and detection method thereof, high value precision resistance R2 and R2 ' is utilized to carry out dividing potential drop measurement to battery two-way leakage detecting circuit, according to battery plus-negative plate, effective monitoring is in real time carried out to the insulation situation of the equivalent insulation resistance value of housing to battery, guarantee that only having the battery case of good insulation could load electric automobile uses, and reduces due to the bad potential safety hazard brought of battery case insulation.
Accompanying drawing explanation
Fig. 1 is the insulation detecting circuit structural representation for battery case of the present invention.
In figure:
1MCU module 2ADC module 3 operational amplifier
4 multidiameter option switchs
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described.
Fig. 1 is the insulation detecting circuit structural representation for battery case of the present invention.
Refer to Fig. 1, the insulation detecting circuit for battery case provided by the invention comprises multiple power brick be cascaded; Wherein, described battery case shell leads to detection of electrical leakage end, the positive terminal of described battery case, detection of electrical leakage end and sampling resistor R2 are connected to form the first leakage detecting circuit, and the negative pole end of described battery case, detection of electrical leakage end and sampling resistor R2 ' are connected to form the second leakage detecting circuit; Described sampling resistor R2, R2 ' double-end voltage terminal is connected with MCU module 1 through multidiameter option switch 4, operational amplifier 3, ADC module 2 successively.
Insulation detecting circuit for battery case provided by the invention, described sampling resistor R2 and resistance R1, resistance R3, K switch m are cascaded formation first voltage sampling loop; These two ends, the first voltage sampling loop are parallel with K switch p; Described sampling resistor R2 ' and resistance R1 ', resistance R3 ' are cascaded formation second voltage sampling loop; These two ends, the second voltage sampling loop are parallel with K switch q.In order to improve isolated measurement circuit and battery case shell, detection of electrical leakage termination has master switch K1, disconnects when master switch K1 is flat, just only close when needs detect electric leakage.R1 and R1 ' is loop resistance, and resistance is large as far as possible, and its resistance size is the upper limit of the leak resistance that insulation detecting circuit can measure, and according to system requirements, this resistance is generally the tens megohm orders of magnitude.R2 and R2 ' is sampling resistor, is used for the dividing potential drop obtained on it, thus calculates surveyed voltage.R3 and R3 ' is isolation resistance, is generally the per mille of R2, in order to improve the signal to noise ratio (S/N ratio) of measuring-signal.Rp and Rq is used to the biasing resistor measuring insulation resistance, and the large I of its resistance is selected flexibly according to measuring accuracy and measurement range.
The detection method of the above-mentioned insulation detecting circuit for battery case, comprises the steps:
A) closed Km, disconnects Kp and Kq, switches multidiameter option switch 4 to the first leakage detecting circuit A, measures A road voltage, is designated as VA0; Process through operational amplifier 3 and ADC module 2, deliver to MCU module 1;
B) switch multidiameter option switch 4 to the second leakage detecting circuit B, measure B road voltage, be designated as VB0; Process through operational amplifier 3 and ADC module 2, deliver to MCU module 1;
C) closed Km and Kp, disconnects Kq, switches multidiameter option switch 4 to the first leakage detecting circuit A, continues to measure A road voltage, is designated as VA1; Process through operational amplifier 3 and ADC module 2, deliver to MCU module 1;
D) switch multidiameter option switch 4 to the second leakage detecting circuit B, continue to measure B road voltage, be designated as VB1; Process through operational amplifier 3 and ADC module 2, deliver to MCU module 1;
E) closed Km and Kq, disconnects Kp, switches multidiameter option switch 4 to the first leakage detecting circuit A, continues to measure A road voltage, is designated as VA2; Process through operational amplifier 3 and ADC module 2, deliver to MCU module 1;
F) switch multidiameter option switch 4 to the second leakage detecting circuit B, continue to measure B road voltage, be designated as VB2; Process through operational amplifier 3 and ADC module 2, deliver to MCU module 1;
G) according to the resistance of VA0, VA1, VA2 and R1-R3, anode is calculated to the equivalent insulation resistance R7 of housing; According to the resistance of VB0, VB1, VB2 and R1 '-R3 ', calculate battery cathode to the resistance value of the equivalent insulation resistance R8 of housing; Insulation status refers to the electric leakage situation of battery to battery case shell, therefore can know the drain conditions of battery case according to the resistance of equivalent insulation resistance R7 and R8.
The detection method of the above-mentioned insulation detecting circuit for battery case, wherein, when measurement voltage signal VA0, VB0, VA1, VB1, VA2, VB2, each voltage signal continuous sampling N time, N is natural number, any sampled signal once exceedes reasonable voltage then resampling, and the difference between N continuous time sampled value is less than predetermined error range, then confirm this sampling effectively; Preferred sampling number is 3 times.The detection of electrical leakage end of described battery case is by electronic switch K1 and sampling resistor R2, R2 ' be connected, described electronic switch K1 is only just closed when carrying out insulation measurement, thus the coupling reduced between metering circuit and measured target, strengthen stability and the reliability of system.
In sum, the insulation detecting circuit for battery case provided by the invention and detection method thereof, utilize high value precision resistance R2 and R2 ' to carry out dividing potential drop measurement to battery total voltage; By calculating anode, the equivalent insulation resistance of negative pole to housing infers drain conditions, thus carries out effective monitoring in real time to the insulation situation of battery.
Although the present invention discloses as above with preferred embodiment; so itself and be not used to limit the present invention, any those skilled in the art, without departing from the spirit and scope of the present invention; when doing a little amendment and perfect, therefore protection scope of the present invention is when being as the criterion of defining with claims.
Claims (4)
1. for a detection method for the insulation detecting circuit of battery case, it is characterized in that, comprise the steps:
A) closed Km, disconnects Kp and Kq, switches multidiameter option switch (4) to the first leakage detecting circuit A, measures A road voltage, be designated as VA0; Through operational amplifier (3) and ADC module (2) process, deliver to MCU module (1);
B) switch multidiameter option switch (4) to the second leakage detecting circuit B, measure B road voltage, be designated as VB0; Through operational amplifier (3) and ADC module (2) process, deliver to MCU module (1);
C) closed Km and Kp, disconnects Kq, switches multidiameter option switch (4) to the first leakage detecting circuit A, continues to measure A road voltage, is designated as VA1; Through operational amplifier (3) and ADC module (2) process, deliver to MCU module (1);
D) switch multidiameter option switch (4) to the second leakage detecting circuit B, continue to measure B road voltage, be designated as VB1; Through operational amplifier (3) and ADC module (2) process, deliver to MCU module (1);
E) closed Km and Kq, disconnects Kp, switches multidiameter option switch (4) to the first leakage detecting circuit A, continues to measure A road voltage, is designated as VA2; Through operational amplifier (3) and ADC module (2) process, deliver to MCU module (1);
F) switch multidiameter option switch (4) to the second leakage detecting circuit B, continue to measure B road voltage, be designated as VB2; Through operational amplifier (3) and ADC module (2) process, deliver to MCU module (1);
G) according to the resistance of VA0, VA1, VA2 and R1-R3, anode is calculated to the equivalent insulation resistance R7 of housing; According to the resistance of VB0, VB1, VB2 and R1 '-R3 ', calculate battery cathode to the resistance value of the equivalent insulation resistance R8 of housing;
Described insulation detecting circuit, comprises multiple power brick be cascaded; Described battery case shell leads to detection of electrical leakage end, the positive terminal of described battery case, detection of electrical leakage end and sampling resistor R2 are connected to form the first leakage detecting circuit, and the negative pole end of described battery case, detection of electrical leakage end and sampling resistor R2 ' are connected to form the second leakage detecting circuit; Described sampling resistor R2, R2 ' double-end voltage terminal is connected with MCU module (1) through multidiameter option switch (4), operational amplifier (3), ADC module (2) successively; Described sampling resistor R2 and loop resistance R1, isolation resistance R3, K switch m are cascaded formation first voltage sampling loop; These two ends, the first voltage sampling loop are parallel with K switch p; Described sampling resistor R2 ' and loop resistance R1 ', isolation resistance R3 ' are cascaded formation second voltage sampling loop; These two ends, the second voltage sampling loop are parallel with K switch q.
2. as claimed in claim 1 for the detection method of the insulation detecting circuit of battery case, it is characterized in that, when measurement voltage signal VA0, VB0, VA1, VB1, VA2, VB2, each voltage signal continuous sampling N time, N is natural number, any sampled signal once exceedes reasonable voltage then resampling, and the difference between N continuous time sampled value is less than predetermined error range, then confirm this sampling effectively.
3., as claimed in claim 2 for the detection method of the insulation detecting circuit of battery case, it is characterized in that, sampling number is 3 times.
4. as claimed in claim 1 for the detection method of the insulation detecting circuit of battery case, it is characterized in that, the detection of electrical leakage end of described battery case is by electronic switch K1 and sampling resistor R2, R2 ' be connected, and described electronic switch K1 only just closes when carrying out insulation measurement.
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