CN109696581A - A kind of insulating resistor detecting circuit and its control method of power battery - Google Patents
A kind of insulating resistor detecting circuit and its control method of power battery Download PDFInfo
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
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Abstract
The present invention discloses the insulating resistor detecting circuit and its control method of a kind of power battery, by to first capacitor and the second capacitor charge and discharge, and cooperates charging control switch and discharge control switch to realize power battery B high pressure in insulation resistance detection process and effectively reduce high-voltage safety risk with the isolation between environment ground.Meanwhile also passing through power battery and charging simultaneously to first capacitor and the second capacitor, respectively individually electric discharge afterwards avoids the caused calculating mistake of power battery voltage jump during conventional insulator resistance detection.Realize improve insulation resistance monitoring accuracy, and reduce high pressure to low pressure crosstalk risk purpose.
Description
Technical field
The present invention relates to power battery technology fields, detect more specifically to a kind of insulation resistance of power battery
Circuit and its control method.
Background technique
As Global Oil resource day is becoming tight, mankind's environmental consciousness is increasingly enhanced, power battery in new-energy automobile and
The technical fields such as wind power generation are widely applied.In new-energy automobile field, the operating voltage use of power battery is higher
Voltage specification；It is higher in the operating voltage of wind power generation field, power battery.Higher operating voltage is to power battery and ring
More stringent requirements are proposed for insulation performance between condition.It is tight when multiple spot insulation performance occurs between high voltage circuit and environment ground
It when declining again, can not only jeopardize the personal safety of surrounding people, also result in the heat product effect of loop of electric leakage, may cause electrical
Fire.Therefore, detection power battery has great importance to the electrical insulation properties on environment ground.
Application No. is 200910092567.5 patent documents to disclose a kind of power battery pack insulation against ground resistance detection electricity
Road, shown in Figure 1, the calculation method of insulation resistance is that the first step passes through R11, R12 acquisition U0；Second step passes through
N4PIN1/2 obtains I21；Third step obtains I31 by N4PIN3/4；Final step two, step 3 obtain equation calculation and obtain R
+, R- insulation resistance value size.The program has the following problems that the acquisition of (1) U0 is only carried out in the first step, later second step, the
Three steps are all to be calculated with the value for reference, ignore U0 and change with time, especially ought have High-current output suddenly
When U0 in a short time can great changes have taken place amount, this would be possible to directly result in insulating-resistance meter and calculates mistake；(2) high-pressure system U0
It is connected directly between environment ground by resistance, there are high pressures to low pressure crosstalk risk.
Summary of the invention
In view of this, the present invention proposes the insulating resistor detecting circuit and its control method of a kind of power battery, it is intended to realize
Improve insulation resistance monitoring accuracy, and reduce high pressure to low pressure crosstalk risk purpose.
To achieve the goals above, it is proposed that scheme it is as follows:
A kind of insulating resistor detecting circuit of power battery, comprising: charging control switch, discharge control switch, the first electricity
Receiving electric control switch, the second capacitor discharge control switch, the first control switch of voltage acquisition, the control of voltage acquisition second are opened
Pass, voltage acquisition third control switch, first capacitor, the second capacitor, charging resistor, total voltage calculate first resistor, total voltage
Calculate second resistance, component voltage calculates first resistor, component voltage calculates second resistance, component voltage calculates 3rd resistor, component voltage
Calculate the 4th resistance；
Power battery anode successively by the charging control switch, the charging resistor, the discharge control switch,
First insulation resistance to be measured, the second insulation resistance to be measured are connected to the cathode of the power battery；
The cathode of the power battery connects by the concatenated first capacitor and the first capacitor discharge control switch
It is connected to the junction of the charging resistor and the discharge control switch；
The cathode of the power battery also passes through concatenated second capacitor and the second capacitor control of discharge
Switch is connected to the junction of the charging resistor and the discharge control switch；
The cathode of the power battery also calculates first resistor, voltage acquisition first by the concatenated total voltage
Control switch and the total voltage calculate second resistance and are connected to the discharge control switch and first insulation resistance to be measured
Junction；
The cathode of the power battery also successively calculates first resistor, the voltage acquisition the by the component voltage
Two control switches, the component voltage calculate second resistance, the component voltage calculates 3rd resistor, voltage acquisition third control
Switch, the component voltage calculate the connection that the 4th resistance is connected to the discharge control switch and first insulation resistance to be measured
Place；
The junction of first insulation resistance to be measured and second insulation resistance to be measured calculates the with the component voltage
Two resistance are connected with the junction that the component voltage calculates 3rd resistor；
The junction of first insulation resistance to be measured and second insulation resistance to be measured is with being also attached to environment.
Preferably, the first capacitor and second capacitor are the capacitor of same model.
Preferably, the charging control switch, the discharge control switch, the first capacitor discharge control switch, institute
State the second capacitor discharge control switch, the first control switch of the voltage acquisition, the second control switch of the voltage acquisition and institute
It is equal to state voltage acquisition third control switch are as follows: triode, metal-oxide-semiconductor or relay.
A kind of control method of the insulating resistor detecting circuit of power battery, applied to above-mentioned circuit, the method packet
It includes:
The charging control switch, the first capacitor discharge control switch and the second capacitor control of discharge is controlled to open
It closes and closes, and control the discharge control switch and disconnect；
After default first time, the charging control switch, the first capacitor discharge control switch and institute are controlled
The disconnection of the second capacitor discharge control switch is stated, and controls the discharge control switch closure；
The first capacitor discharge control switch closure is controlled, first control switch of voltage acquisition and the electricity are controlled
Pressure acquisition third control switch is closed at, and within default second time, calculates second resistance and described total to the total voltage
Voltage calculates the first voltage between first resistor and the component voltage calculates 3rd resistor and the component voltage calculates the 4th
Second voltage between resistance synchronizes acquisition；
Control the first capacitor discharge control switch, the first control switch of the voltage acquisition and the voltage acquisition
Three control switches disconnect；
The second capacitor discharge control switch closure is controlled, first control switch of voltage acquisition and the electricity are controlled
Pressure acquisition the second control switch be closed at, within the default third time, to the total voltage calculate second resistance and it is described always
Voltage calculates the tertiary voltage between first resistor and the component voltage calculates first resistor and the component voltage calculates second
The 4th voltage between resistance synchronizes acquisition；
The first voltage and the second voltage are substituted into the first calculation formula of insulation resistance, by the tertiary voltage and
4th voltage substitutes into the second calculation formula of insulation resistance, in conjunction with first calculation formula of insulation resistance and the insulated electro
The second calculation formula is hindered, the resistance value of the first insulation resistance to be measured and the second insulation resistance to be measured is calculated；
First calculation formula of insulation resistance are as follows:
Second calculation formula of insulation resistance are as follows:
Wherein, R01Indicate that total voltage calculates first resistor, R00Indicate that total voltage calculates second resistance, R21Indicate component voltage
Calculate first resistor, R20Indicate that component voltage calculates second resistance, R11Indicate that component voltage calculates 3rd resistor, R10Indicate component voltage
It calculates the 4th resistance, indicate UC1First voltage, U1Indicate second voltage, UC2Indicate tertiary voltage, U2Indicate the 4th voltage, RISO1
Indicate the first insulation resistance to be measured, RISO2Indicate the second insulation resistance to be measured.
Compared with prior art, technical solution of the present invention has the advantage that
Above-mentioned technical proposal provides the insulating resistor detecting circuit and its control method of a kind of power battery, by first
Capacitor and the second capacitor charge and discharge, and charging control switch and discharge control switch is cooperated to realize in insulation resistance detection process
Power battery B high pressure effectively reduces high-voltage safety risk with the isolation between environment ground.Meanwhile also passing through power battery pair
First capacitor and the second capacitor charge simultaneously, and rear respectively individually electric discharge avoids power electric during conventional insulator resistance detection
Mistake is calculated caused by cell voltage mutation.The accuracy for improving insulation resistance monitoring is realized, and reduces high pressure to low pressure string
Disturb the purpose of risk.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is a kind of power battery pack insulation against ground resistance detecting circuit in the prior art；
Fig. 2 is a kind of insulating resistor detecting circuit figure of power battery provided in an embodiment of the present invention；
Fig. 3 is a kind of process of the control method of the insulating resistor detecting circuit of power battery provided in an embodiment of the present invention
Figure；
Fig. 4 is the status diagram of control switch during capacitor charging provided in an embodiment of the present invention；
Fig. 5 is the status diagram of control switch after the completion of capacitor charging provided in an embodiment of the present invention；
Fig. 6 is that the state of control switch provided in an embodiment of the present invention when acquiring to first voltage and second voltage is illustrated
Figure；
Fig. 7 be it is provided in an embodiment of the present invention to tertiary voltage and four voltage acquisitions when control switch state signal
Figure.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
The embodiment of the invention provides a kind of insulating resistor detecting circuits of power battery, and referring to fig. 2, which includes:
Charging control switch SR1, discharge control switch SR2, first capacitor discharge control switch SC1, the second capacitor discharge control switch SC2、
The first control switch of voltage acquisition S0, the second control switch of voltage acquisition S2, voltage acquisition third control switch S1, first capacitor
C1, the second capacitor C2, charging resistor RC, total voltage calculate first resistor R01, total voltage calculate second resistance R00, component voltage calculate
First resistor R21, component voltage calculate second resistance R20, component voltage calculate 3rd resistor R11, component voltage calculate the 4th resistance R10；
The anode of power battery BATT successively passes through the charging control switch SR1, the charging resistor RC, the electric discharge
Control switch SR2, the first insulation resistance R to be measuredISO1, the second insulation resistance R to be measuredISO2It is connected to the power battery BATT's
Cathode；
The cathode of the power battery BATT passes through the concatenated first capacitor C1With the first capacitor control of discharge
Switch SC1It is connected to the charging resistor RCWith the discharge control switch SR2Junction；
The cathode of the power battery BATT also passes through the concatenated second capacitor C2It is put with second capacitor
Electric control switch SC2It is connected to the charging resistor RCWith the discharge control switch SR2Junction；
The cathode of the power battery BATT also calculates first resistor R by the concatenated total voltage01, voltage adopts
Collect the first control switch S0Second resistance R is calculated with the total voltage00It is connected to the discharge control switch SR2With it is described to be measured
First insulation resistance RISO1Junction；
The cathode of the power battery BATT also successively calculates first resistor R by the component voltage21, the voltage
Acquire the second control switch S2, the component voltage calculate second resistance R20, the component voltage calculate 3rd resistor R11, the voltage
Acquire third control switch S1, the component voltage calculate the 4th resistance R10It is connected to the discharge control switch SR2With it is described to be measured
First insulation resistance RIOS1Junction；
The first insulation resistance R to be measuredIOS1With the second insulation resistance R to be measuredIOS2Junction, with described point of electricity
Pressure calculates second resistance R203rd resistor R is calculated with the component voltage11Junction be connected；
The first insulation resistance R to be measuredIOS1With the second insulation resistance R to be measuredIOS2Junction be also attached to environment
Ground GND.PG is with indicating power battery high pressure.
The embodiment of the invention provides a kind of insulating resistor detecting circuits of power battery, by first capacitor C1With
Two capacitor C2Charge and discharge, and cooperate charging control switch SR1With discharge control switch SR2It realizes in insulation resistance detection process and moves
With environment the isolation between GND of power battery BATT high pressure, effectively reduces high-voltage safety risk.Meanwhile also passing through power electric
Pond BATT is to first capacitor C1With the second capacitor C2It charges simultaneously, rear respectively individually electric discharge avoids conventional insulator resistance detection mistake
Mistake is calculated in journey caused by power battery BATT voltage jump.Realize the accuracy for improving insulation resistance monitoring, and drop
Purpose of the low high pressure to low pressure crosstalk risk.
Preferably, the first capacitor C1With the second capacitor C2For the capacitor of same model.Select the electricity of same model
Hold, so that the capacitance and electrical characteristic parameter of two capacitors are consistent.
Preferably, the charging control switch SR1, the discharge control switch SR2, the first capacitor control of discharge opens
Close SC1, the second capacitor discharge control switch SC2, the first control switch of voltage acquisition S0, the voltage acquisition second controls
Make switch S2With the voltage acquisition third control switch S1Are as follows: triode, metal-oxide-semiconductor or relay.
The control method for present embodiments providing a kind of insulating resistor detecting circuit of above-mentioned power battery, referring to Fig. 3~
Fig. 7, which comprises
Step S11: the charging control switch S is controlledR1, first capacitor discharge control switch SC1It discharges with the second capacitor
Control switch SC2Closure, and control discharge control switch SR2It disconnects；
Fig. 4 shows power battery BATT to first capacitor C1With the second capacitor C2Each control switch of charging process
Status diagram.
Step S12: after default first time, the charging control switch S is controlledR1, first capacitor control of discharge opens
Close SC1With the second capacitor discharge control switch SC2It disconnects, and controls discharge control switch SR2Closure；
By to first capacitor C1With the second capacitor C2Charge and discharge, and cooperate charging control switch SR1And discharge control switch
SR2The isolation of power battery BATT high pressure in insulation resistance detection process with environment between GND is realized, height is effectively reduced
Press security risk.Fig. 5 is shown to first capacitor C1With the second capacitor C2The state of each control switch after charging complete is illustrated
Figure.According to charging resistor RCAnd first capacitor C1, the second capacitor C2Amount of capacity be calculated at the first time, that is, charge when
Between.Charge constant t=RC, setting charging time T are greater than 3t.
Step S13: control first capacitor discharge control switch SC1Closure controls the first control switch of voltage acquisition S0And electricity
Pressure acquisition third control switch S1It is closed at, within default second time, second resistance R is calculated to total voltage00And total voltage
Calculate first resistor R01Between first voltage UC1And component voltage calculates 3rd resistor R11The 4th resistance is calculated with component voltage
R10Between second voltage U1Synchronize acquisition；
Fig. 6 is shown to first voltage UC1With second voltage U1Synchronize the state signal of each control switch when acquisition
Figure.In view of first capacitor C1Discharge time, to first voltage U within preset second timeC1With second voltage U1It carries out
Synchronous acquisition.Following calculation formula is obtained according to circuit theory:
UISO2=IISO2×RISO2 (4)
UC=UISO1+UISO2 (5)
The first calculation formula of insulation resistance (6) is obtained in conjunction with formula (1)~(5):
Step S14: control first capacitor discharge control switch SC1, the first control switch of voltage acquisition S0With voltage acquisition
Three control switch S1It disconnects；
Step S15: the second capacitor discharge control switch S of controlC2Closure controls the first control switch of voltage acquisition S0And electricity
The second control switch S of pressure acquisition2It is closed at, within the default third time, second resistance R is calculated to total voltage00And total voltage
Calculate first resistor R01Between tertiary voltage UC2And component voltage calculates first resistor R21Second resistance is calculated with component voltage
R20Between the 4th voltage U2Synchronize acquisition；
Fig. 7 is shown to voltage UC2With voltage U2Synchronize the status diagram of each control switch when acquisition.Consider
To the second capacitor C2Discharge time, to voltage U within the preset third timeC2With the 4th voltage U2Synchronize acquisition.Root
Following calculation formula is obtained according to circuit theory:
UISO1=IISO1×RISO1 (10)
UC=UISO1+UISO2 (11)
The second calculation formula of insulation resistance (12) is obtained in conjunction with formula (7)~(11):
Step S16: by first voltage UC1With second voltage U1The first calculation formula of insulation resistance is substituted into, by tertiary voltage UC2
With the 4th voltage U2The second calculation formula of insulation resistance is substituted into, is counted in conjunction with the first calculation formula of insulation resistance and insulation resistance second
Formula is calculated, the first insulation resistance R to be measured is calculatedISO1With the second insulation resistance R to be measuredISO2Resistance value.
Total voltage calculates first resistor R01, total voltage calculate second resistance R00, component voltage calculate first resistor R21, point electricity
Pressure calculates second resistance R20, component voltage calculate 3rd resistor R11, component voltage calculate the 4th resistance R10Resistance value be to learn in advance
Value therefore detecting UC1、U1、UC2、U2Afterwards, the first insulation resistance R to be measured is calculated by formula (6) and (12)ISO1
With the second insulation resistance R to be measuredISO2Resistance value.
By to UCAnd U1And UCAnd U2Synchronous acquisition, guarantee capacitor discharge process in two voltages proportionate relationship protect
Influence of the discharge curve held unanimously, and do not have to worry capacitance voltage itself to collection voltages.
Herein, relational terms such as first and second and the like be used merely to by an entity or operation with it is another
One entity or operation distinguish, and without necessarily requiring or implying between these entities or operation, there are any this reality
Relationship or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to the packet of nonexcludability
Contain, so that the process, method, article or equipment for including a series of elements not only includes those elements, but also including
Other elements that are not explicitly listed, or further include for elements inherent to such a process, method, article, or device.
In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that including the element
Process, method, article or equipment in there is also other identical elements.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with other
The difference of embodiment, the same or similar parts in each embodiment may refer to each other.
To the above description of disclosed embodiment of this invention, it can be realized professional and technical personnel in the field or use this
Invention.Various modifications to these embodiments will be readily apparent to those skilled in the art, institute herein
The General Principle of definition can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore,
The present invention will not be limited to the embodiments shown herein, and is to fit to special with principles disclosed herein and novelty
The consistent widest scope of point.
Claims (4)
1. a kind of insulating resistor detecting circuit of power battery characterized by comprising charging control switch, control of discharge are opened
Pass, first capacitor discharge control switch, the second capacitor discharge control switch, the first control switch of voltage acquisition, voltage acquisition
Two control switches, voltage acquisition third control switch, first capacitor, the second capacitor, charging resistor, total voltage calculate the first electricity
Resistance, total voltage calculate second resistance, component voltage calculates first resistor, component voltage calculates second resistance, component voltage calculates third electricity
Resistance, component voltage calculate the 4th resistance；
The anode of power battery is successively by the charging control switch, charging resistor, the discharge control switch, to be measured
First insulation resistance, the second insulation resistance to be measured are connected to the cathode of the power battery；
The cathode of the power battery is connected to by the concatenated first capacitor and the first capacitor discharge control switch
The junction of the charging resistor and the discharge control switch；
The cathode of the power battery also passes through concatenated second capacitor and the second capacitor discharge control switch
It is connected to the junction of the charging resistor and the discharge control switch；
The cathode of the power battery also calculates first resistor by the concatenated total voltage, voltage acquisition first controls
Switch and the total voltage calculate the company that second resistance is connected to the discharge control switch and first insulation resistance to be measured
Meet place；
The cathode of the power battery also successively calculates first resistor by the component voltage, the voltage acquisition second is controlled
System switch, the component voltage calculate second resistance, the component voltage calculates 3rd resistor, voltage acquisition third control is opened
It closes, the component voltage calculates the connection that the 4th resistance is connected to the discharge control switch and first insulation resistance to be measured
Place；
The junction of first insulation resistance to be measured and second insulation resistance to be measured calculates the second electricity with the component voltage
The junction for calculating 3rd resistor with the component voltage is hindered to be connected；
The junction of first insulation resistance to be measured and second insulation resistance to be measured is with being also attached to environment.
2. circuit according to claim 1, which is characterized in that the first capacitor and second capacitor are same model
Capacitor.
3. circuit according to claim 1, which is characterized in that the charging control switch, the discharge control switch, institute
State first capacitor discharge control switch, the second capacitor discharge control switch, the first control switch of the voltage acquisition, described
The second control switch of voltage acquisition and the voltage acquisition third control switch are equal are as follows: triode, metal-oxide-semiconductor or relay.
4. a kind of control method of the insulating resistor detecting circuit of power battery, which is characterized in that be applied to claims 1 to 3
Circuit described in any one, which comprises
The charging control switch, the first capacitor discharge control switch and the second capacitor discharge control switch is controlled to close
It closes, and controls the discharge control switch and disconnect；
After default first time, the charging control switch, the first capacitor discharge control switch and described the are controlled
Two capacitor discharge control switches disconnect, and control the discharge control switch closure；
The first capacitor discharge control switch closure is controlled, first control switch of voltage acquisition is controlled and the voltage is adopted
Collection third control switch is closed at, and within default second time, calculates second resistance and the total voltage to the total voltage
It calculates first voltage and the component voltage between first resistor and calculates 3rd resistor and the component voltage the 4th resistance of calculating
Between second voltage synchronize acquisition；
Control the first capacitor discharge control switch, the first control switch of the voltage acquisition and the voltage acquisition third control
System switch disconnects；
The second capacitor discharge control switch closure is controlled, first control switch of voltage acquisition is controlled and the voltage is adopted
Collect the second control switch to be closed at, within the default third time, second resistance and the total voltage are calculated to the total voltage
It calculates tertiary voltage and the component voltage between first resistor and calculates first resistor and component voltage calculating second resistance
Between the 4th voltage synchronize acquisition；
The first voltage and the second voltage are substituted into the first calculation formula of insulation resistance, by the tertiary voltage and described
4th voltage substitutes into the second calculation formula of insulation resistance, in conjunction with first calculation formula of insulation resistance and the insulation resistance the
The resistance value of the first insulation resistance to be measured and the second insulation resistance to be measured is calculated in two calculation formula；
First calculation formula of insulation resistance are as follows:
Second calculation formula of insulation resistance are as follows:
Wherein, R01Indicate that total voltage calculates first resistor, R00Indicate that total voltage calculates second resistance, R21Indicate that component voltage calculates
First resistor, R20Indicate that component voltage calculates second resistance, R11Indicate that component voltage calculates 3rd resistor, R10Indicate that component voltage calculates
4th resistance indicates UC1First voltage, U1Indicate second voltage, UC2Indicate tertiary voltage, U2Indicate the 4th voltage, RISO1It indicates
First insulation resistance to be measured, RISO2Indicate the second insulation resistance to be measured.
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| TWI790148B (en) * | 2022-03-22 | 2023-01-11 | 台達電子工業股份有限公司 | Insulation resistance detection circuit and method of detecting insulation resistance |
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| 樊晓松等: "动力电池系统高压电绝缘设计与测试", 《上海汽车》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI790148B (en) * | 2022-03-22 | 2023-01-11 | 台達電子工業股份有限公司 | Insulation resistance detection circuit and method of detecting insulation resistance |
| CN114563674A (en) * | 2022-04-24 | 2022-05-31 | 杭州华塑科技股份有限公司 | Insulation detection device and method applied to energy storage system |
| CN114563674B (en) * | 2022-04-24 | 2022-07-22 | 杭州华塑科技股份有限公司 | Insulation detection device and method applied to energy storage system |
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