CN109696581B - Insulation resistance detection circuit of power battery and control method thereof - Google Patents
Insulation resistance detection circuit of power battery and control method thereof Download PDFInfo
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- CN109696581B CN109696581B CN201711003112.2A CN201711003112A CN109696581B CN 109696581 B CN109696581 B CN 109696581B CN 201711003112 A CN201711003112 A CN 201711003112A CN 109696581 B CN109696581 B CN 109696581B
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Abstract
The invention discloses an insulation resistance detection circuit of a power battery and a control method thereof. Meanwhile, the first capacitor and the second capacitor are charged simultaneously through the power battery and then discharged independently, so that the calculation error caused by voltage mutation of the power battery in the traditional insulation resistance detection process is avoided. The method achieves the purposes of improving the accuracy of insulation resistance monitoring and reducing the risk of crosstalk from high voltage to low voltage.
Description
Technical Field
The invention relates to the technical field of power batteries, in particular to an insulation resistance detection circuit of a power battery and a control method thereof.
Background
With the increasing shortage of global petroleum resources and the increasing enhancement of human environmental awareness, power batteries are widely applied in the technical fields of new energy automobiles, wind power generation and the like. In the field of new energy automobiles, the working voltage of a power battery adopts a higher voltage specification; in the field of wind power generation, the working voltage of the power battery is higher. Higher operating voltages place higher demands on the insulation properties between the power cell and the surrounding ground. When the multipoint insulation performance between the high-voltage circuit and the environment ground is seriously reduced, not only the personal safety of surrounding personnel is endangered, but also the heat accumulation effect of a leakage loop is caused, and an electrical fire can be caused. Therefore, it is important to detect the electrical insulation performance of the power battery to the environment.
The patent document with the application number of 200910092567.5 discloses a detection circuit for insulation resistance of a power battery pack to the ground, and referring to fig. 1, the insulation resistance is calculated by obtaining U0 through R11 and R12 in the first step; secondly, obtaining I21 through N4 PIN 1/2; thirdly, obtaining I31 through N4 PIN 3/4; and finally, calculating the R + and R-insulation resistance values by using the equation obtained in the second step and the equation obtained in the third step. The scheme has the following problems that (1) the U0 is obtained only in the first step, and then the second step and the third step are calculated by taking the value as a reference, the change of U0 along with time is ignored, particularly, when a large current is suddenly output, the U0 has large change in a short time, and the calculation error of the insulation resistance can be directly caused; (2) the high voltage system U0 is connected directly to ambient ground through a resistor, presenting a risk of high to low voltage crosstalk.
Disclosure of Invention
In view of the above, the present invention provides an insulation resistance detection circuit for a power battery and a control method thereof, which are intended to achieve the purpose of improving the accuracy of insulation resistance monitoring and reducing the risk of crosstalk from high voltage to low voltage.
In order to achieve the above object, the following solutions are proposed:
an insulation resistance detection circuit of a power battery comprises: the device comprises a charging control switch, a discharging control switch, a first capacitor discharging control switch, a second capacitor discharging control switch, a voltage acquisition first control switch, a voltage acquisition second control switch, a voltage acquisition third control switch, a first capacitor, a second capacitor, a charging resistor, a total voltage calculation first resistor, a total voltage calculation second resistor, a divided voltage calculation first resistor, a divided voltage calculation second resistor, a divided voltage calculation third resistor and a divided voltage calculation fourth resistor;
the positive electrode of the power battery is connected to the negative electrode of the power battery through the charging control switch, the charging resistor, the discharging control switch, the first insulation resistor to be tested and the second insulation resistor to be tested in sequence;
the negative electrode of the power battery is connected to the connection position of the charging resistor and the discharging control switch through the first capacitor and the first capacitor discharging control switch which are connected in series;
the negative electrode of the power battery is also connected to the connection position of the charging resistor and the discharge control switch through the second capacitor and the second capacitor discharge control switch which are connected in series;
the negative electrode of the power battery is connected to the joint of the discharge control switch and the first insulation resistor to be detected through the total voltage calculation first resistor, the voltage acquisition first control switch and the total voltage calculation second resistor which are connected in series;
the negative electrode of the power battery is connected to the joint of the discharge control switch and the first insulation resistor to be tested through the partial voltage calculation first resistor, the voltage acquisition second control switch, the partial voltage calculation second resistor, the partial voltage calculation third resistor, the voltage acquisition third control switch and the partial voltage calculation fourth resistor in sequence;
the joint of the first insulation resistor to be tested and the second insulation resistor to be tested is connected with the joint of the second resistance calculated by the divided voltage and the third resistance calculated by the divided voltage;
and the joint of the first insulation resistor to be tested and the second insulation resistor to be tested is also connected to the environment.
Preferably, the first capacitor and the second capacitor are capacitors of the same type.
Preferably, the charging control switch, the discharging control switch, the first capacitor discharging control switch, the second capacitor discharging control switch, the voltage acquisition first control switch, the voltage acquisition second control switch, and the voltage acquisition third control switch are all: a triode, a MOS tube or a relay.
A control method of an insulation resistance detection circuit of a power battery is applied to the circuit, and the method comprises the following steps:
controlling the charging control switch, the first capacitor discharging control switch and the second capacitor discharging control switch to be closed, and controlling the discharging control switch to be disconnected;
after a preset first time, controlling the charging control switch, the first capacitor discharging control switch and the second capacitor discharging control switch to be switched off, and controlling the discharging control switch to be switched on;
controlling the first capacitor discharge control switch to be closed, controlling the voltage acquisition first control switch and the voltage acquisition third control switch to be closed simultaneously, and synchronously acquiring second voltages between the total voltage calculation second resistor and the total voltage calculation first resistor, and between the partial voltage calculation third resistor and the partial voltage calculation fourth resistor within a preset second time;
the first capacitor discharge control switch, the voltage acquisition first control switch and the voltage acquisition third control switch are controlled to be switched off;
controlling the second capacitor discharge control switch to be closed, controlling the voltage acquisition first control switch and the voltage acquisition second control switch to be closed simultaneously, and calculating a third voltage between a second resistor of the total voltage calculation and a first resistor of the total voltage calculation and synchronously acquiring a fourth voltage between the first resistor of the partial voltage calculation and a second resistor of the partial voltage calculation within a preset third time;
substituting the first voltage and the second voltage into a first calculation formula of the insulation resistor, substituting the third voltage and the fourth voltage into a second calculation formula of the insulation resistor, and calculating to obtain resistance values of the first insulation resistor to be measured and the second insulation resistor to be measured by combining the first calculation formula of the insulation resistor and the second calculation formula of the insulation resistor;
the first calculation formula of the insulation resistance is as follows:
the second calculation formula of the insulation resistance is as follows:
wherein R is01Calculating a first resistance, R, representing the total voltage00Second resistance, R, representing the total voltage calculation21Calculating a first resistance, R, representing a partial voltage20Calculating a second resistance, R, representing the partial voltage11Third resistance, R, calculated by representing partial voltage10Fourth resistance, U, calculated by representing the partial voltageC1Represents a first voltage, U1Represents a second voltage, UC2Represents a third voltage, U2Represents a fourth voltage, RISO1Indicating the first insulation resistance R to be measuredISO2Representing the second insulation resistance to be measured.
Compared with the prior art, the technical scheme of the invention has the following advantages:
according to the technical scheme, the insulation resistance detection circuit of the power battery and the control method of the insulation resistance detection circuit of the power battery are provided, the first capacitor and the second capacitor are charged and discharged, and the charging control switch and the discharging control switch are matched to realize the isolation between the high voltage of the power battery B and the environment ground in the insulation resistance detection process, so that the high-voltage safety risk is effectively reduced. Meanwhile, the first capacitor and the second capacitor are charged simultaneously through the power battery and then discharged independently, so that the calculation error caused by voltage mutation of the power battery in the traditional insulation resistance detection process is avoided. The method achieves the purposes of improving the accuracy of insulation resistance monitoring and reducing the risk of crosstalk from high voltage to low voltage.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 illustrates a prior art insulation resistance detection circuit for a power battery pack to ground;
fig. 2 is a circuit diagram of detecting insulation resistance of a power battery according to an embodiment of the present invention;
fig. 3 is a flowchart of a control method of an insulation resistance detection circuit of a power battery according to an embodiment of the present invention;
fig. 4 is a schematic diagram illustrating a state of a control switch in a capacitor charging process according to an embodiment of the present invention;
fig. 5 is a schematic diagram illustrating a state of a control switch after the capacitor is charged according to an embodiment of the present invention;
fig. 6 is a schematic diagram of states of a control switch when collecting a first voltage and a second voltage according to an embodiment of the present invention;
fig. 7 is a schematic diagram of states of a control switch when collecting a third voltage and a fourth voltage according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention provides an insulation resistance detection circuit of a power battery, and referring to fig. 2, the circuit comprises: charging control switch SR1And a discharge control switch SR2First capacitor discharge control switch SC1A second capacitor discharge control switch SC2First control switch S for voltage acquisition0Voltage acquisition second control switch S2Voltage acquisition third control switch S1A first capacitor C1A second capacitor C2Charging resistor RCCalculating the total voltage by calculating a first resistance R01Calculating the total voltage to obtain a second resistance R00Calculating a first resistance R by a divided voltage21Calculating a second resistance R by the divided voltage20Calculating the third resistance R of the divided voltage11And the fourth resistance R is calculated by the divided voltage10；
The positive electrode of the power battery BATT passes through the charging control switch S in sequenceR1The charging resistor RCThe discharge control switch SR2The first insulation resistor R to be testedISO1A second insulation resistor R to be testedISO2The negative electrode is connected with the power battery BATT;
the negative electrode of the power battery BATT is connected with the first capacitor C in series1And said first capacitor discharge control switch SC1Is connected to the charging resistor RCAnd the discharge control switch SR2The joint of (a);
the negative electrode of the power battery BATT is connected with the second capacitor C in series2And said second capacitor discharge control switch SC2Is connected to the charging resistor RCAnd the discharge control switch SR2Of the joint；
The negative electrode of the power battery BATT is also connected in series to calculate a first resistor R through the total voltage01First control switch S for voltage acquisition0And calculating a second resistance R from said total voltage00Is connected to the discharge control switch SR2And the first insulation resistor R to be testedISO1The joint of (a);
the negative electrode of the power battery BATT is sequentially subjected to partial voltage calculation to obtain a first resistor R21The voltage acquisition second control switch S2Calculating a second resistance R by the divided voltage20Calculating a third resistance R by the divided voltage11The voltage acquisition third control switch S1Calculating a fourth resistance R by the divided voltage10Is connected to the discharge control switch SR2And the first insulation resistor R to be testedIOS1The joint of (a);
the first insulation resistor R to be testedIOS1And the second insulation resistance R to be measuredIOS2At the junction with the partial voltage, calculating a second resistance R20And said partial voltage calculating a third resistance R11The joints are connected;
the first insulation resistor R to be testedIOS1And the second insulation resistance R to be measuredIOS2Is also connected to the environment GND. PG represents a power battery high voltage ground.
The embodiment of the invention provides an insulation resistance detection circuit of a power battery, which is characterized in that a first capacitor C is connected with a first capacitor C1And a second capacitor C2Charging and discharging in cooperation with charging control switch SR1And a discharge control switch SR2The isolation between the high voltage of the power battery BATT and the environment ground GND in the insulation resistance detection process is realized, and the high-voltage safety risk is effectively reduced. Meanwhile, the first capacitor C is also connected with the power battery BATT1And a second capacitor C2And meanwhile, the battery cells are charged and then independently discharged, so that the calculation error caused by the BATT voltage mutation of the power battery in the traditional insulation resistance detection process is avoided. The method achieves the purposes of improving the accuracy of insulation resistance monitoring and reducing the risk of crosstalk from high voltage to low voltage.
Preferably, the first capacitor C1And said second capacitance C2The capacitors are of the same type. And selecting the capacitors of the same model to ensure that the capacitance values and the electrical characteristic parameters of the two capacitors are consistent.
Preferably, the charge control switch SR1The discharge control switch SR2The first capacitor discharge control switch SC1The second capacitor discharge control switch SC2The first voltage acquisition control switch S0The voltage acquisition second control switch S2And the voltage acquisition third control switch S1All are as follows: a triode, a MOS tube or a relay.
The present embodiment provides a control method of the insulation resistance detection circuit of the power battery, referring to fig. 3 to 7, the method includes:
step S11: controlling the charging control switch SR1First capacitor discharge control switch SC1And a second capacitor discharge control switch SC2Closing and controlling the discharge control switch SR2Disconnecting;
fig. 4 shows a power battery BATT versus a first capacitor C1And a second capacitor C2The state diagram of each control switch of the charging process.
Step S12: after a preset first time, controlling the charging control switch SR1First capacitor discharge control switch SC1And a second capacitor discharge control switch SC2Cut off and control the discharge control switch SR2Closing;
by means of a first capacitor C1And a second capacitor C2Charging and discharging in cooperation with charging control switch SR1And a discharge control switch SR2The isolation between the high voltage of the power battery BATT and the environment ground GND in the insulation resistance detection process is realized, and the high-voltage safety risk is effectively reduced. FIG. 5 shows the first capacitance C1And a second capacitor C2And the state of each control switch after charging is finished is shown schematically. According to the charging resistance RCAnd a first capacitor C1A second capacitor C2Capacity size calculation ofThe first time, i.e. the charging time, is obtained. The charging time constant T is RC, and the charging time T is set to be greater than 3T.
Step S13: control switch S for controlling discharge of first capacitorC1Closing, controlling voltage acquisition first control switch S0And voltage acquisition third control switch S1Closing at the same time, calculating a second resistance R for the total voltage within a preset second time00Calculating the first resistance R from the total voltage01First voltage U betweenC1And calculating a third resistance R of the divided voltage11And the fourth resistance R is calculated by the sum partial voltage10A second voltage U between1Carrying out synchronous acquisition;
FIG. 6 shows the voltage vs. the first voltage UC1And a second voltage U1And the state schematic diagram of each control switch is used for synchronous acquisition. Taking into account the first capacitance C1For a predetermined second time period, to the first voltage UC1And a second voltage U1And carrying out synchronous acquisition. The following calculation formula is obtained according to the circuit principle:
UISO2＝IISO2×RISO2 (4)
UC＝UISO1+UISO2 (5)
and (3) combining the formulas (1) to (5) to obtain a first calculation formula (6) of the insulation resistance:
step S14: control switch S for controlling discharge of first capacitorC1First control switch S for voltage acquisition0And voltage acquisition third control switch S1Disconnecting;
step S15: controlling the discharge of the second capacitorC2Closing, controlling voltage acquisition first control switch S0And a voltage acquisition second control switch S2Closing the two circuits simultaneously, and calculating a second resistance R for the total voltage within a preset third time00Calculating the first resistance R from the total voltage01Third voltage U in betweenC2And calculating the first resistance R by dividing the voltage21And calculating a second resistance R by the sum partial voltage20Fourth voltage U in between2Carrying out synchronous acquisition;
FIG. 7 shows the voltage UC2Sum voltage U2And the state schematic diagram of each control switch is used for synchronous acquisition. Taking into account the second capacitance C2For a predetermined third time against the voltage UC2And a fourth voltage U2And carrying out synchronous acquisition. The following calculation formula is obtained according to the circuit principle:
UISO1＝IISO1×RISO1 (10)
UC＝UISO1+UISO2 (11)
and obtaining a second calculation formula (12) of the insulation resistance by combining the formulas (7) to (11):
step S16: applying a first voltage UC1And a second voltage U1Substituting the first calculation formula of the insulation resistance to obtain a third voltage UC2And a fourth voltage U2Substituting the first calculation formula of the insulation resistance into a second calculation formula of the insulation resistance, and calculating to obtain the first insulation resistance R to be measured by combining the first calculation formula of the insulation resistance and the second calculation formula of the insulation resistanceISO1And a second insulation resistance R to be measuredISO2The resistance value of (c).
Calculating the total voltage by calculating the first resistance R01Calculating the total voltage to obtain a second resistance R00Calculating a first resistance R by a divided voltage21Calculating a second resistance R by the divided voltage20Calculating the third resistance R of the divided voltage11And the fourth resistance R is calculated by the divided voltage10Are all known in advance, so that when U is detectedC1、U1、UC2、U2Then, the first insulation resistance R to be measured is obtained through calculation by the formulas (6) and (12)ISO1And a second insulation resistance R to be measuredISO2The resistance value of (c).
By pairing UCAnd U1And U isCAnd U2The synchronous acquisition ensures that the proportional relation of the two voltages in the capacitor discharging process is kept consistent, and the influence of the discharging curve of the capacitor voltage on the acquired voltage is avoided.
In this document, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (3)
1. A control method of an insulation resistance detection circuit of a power battery is characterized in that the insulation resistance detection circuit of the power battery comprises the following steps: the device comprises a charging control switch, a discharging control switch, a first capacitor discharging control switch, a second capacitor discharging control switch, a voltage acquisition first control switch, a voltage acquisition second control switch, a voltage acquisition third control switch, a first capacitor, a second capacitor, a charging resistor, a total voltage calculation first resistor, a total voltage calculation second resistor, a divided voltage calculation first resistor, a divided voltage calculation second resistor, a divided voltage calculation third resistor and a divided voltage calculation fourth resistor;
the positive electrode of the power battery is connected to the negative electrode of the power battery through the charging control switch, the charging resistor, the discharging control switch, the first insulation resistor to be tested and the second insulation resistor to be tested in sequence;
the negative electrode of the power battery is connected to the connection position of the charging resistor and the discharging control switch through the first capacitor and the first capacitor discharging control switch which are connected in series;
the negative electrode of the power battery is also connected to the connection position of the charging resistor and the discharge control switch through the second capacitor and the second capacitor discharge control switch which are connected in series;
the negative electrode of the power battery is connected to the joint of the discharge control switch and the first insulation resistor to be detected through the total voltage calculation first resistor, the voltage acquisition first control switch and the total voltage calculation second resistor which are connected in series;
the negative electrode of the power battery is connected to the joint of the discharge control switch and the first insulation resistor to be tested through the partial voltage calculation first resistor, the voltage acquisition second control switch, the partial voltage calculation second resistor, the partial voltage calculation third resistor, the voltage acquisition third control switch and the partial voltage calculation fourth resistor in sequence;
the joint of the first insulation resistor to be tested and the second insulation resistor to be tested is connected with the joint of the second resistance calculated by the divided voltage and the third resistance calculated by the divided voltage;
the joint of the first insulation resistor to be tested and the second insulation resistor to be tested is also connected to the environment;
the method comprises the following steps:
controlling the charging control switch, the first capacitor discharging control switch and the second capacitor discharging control switch to be closed, and controlling the discharging control switch to be disconnected;
after a preset first time, controlling the charging control switch, the first capacitor discharging control switch and the second capacitor discharging control switch to be switched off, and controlling the discharging control switch to be switched on;
controlling the first capacitor discharge control switch to be closed, controlling the voltage acquisition first control switch and the voltage acquisition third control switch to be closed simultaneously, and synchronously acquiring second voltages between the total voltage calculation second resistor and the total voltage calculation first resistor, and between the partial voltage calculation third resistor and the partial voltage calculation fourth resistor within a preset second time;
the first capacitor discharge control switch, the voltage acquisition first control switch and the voltage acquisition third control switch are controlled to be switched off;
controlling the second capacitor discharge control switch to be closed, controlling the voltage acquisition first control switch and the voltage acquisition second control switch to be closed simultaneously, and calculating a third voltage between a second resistor of the total voltage calculation and a first resistor of the total voltage calculation and synchronously acquiring a fourth voltage between the first resistor of the partial voltage calculation and a second resistor of the partial voltage calculation within a preset third time;
substituting the first voltage and the second voltage into a first calculation formula of the insulation resistor, substituting the third voltage and the fourth voltage into a second calculation formula of the insulation resistor, and calculating to obtain resistance values of the first insulation resistor to be measured and the second insulation resistor to be measured by combining the first calculation formula of the insulation resistor and the second calculation formula of the insulation resistor;
the first calculation formula of the insulation resistance is as follows:
the second calculation formula of the insulation resistance is as follows:
wherein R is01Calculating a first resistance, R, representing the total voltage00Second resistance, R, representing the total voltage calculation21Calculating a first resistance, R, representing a partial voltage20Calculating a second resistance, R, representing the partial voltage11Third resistance, R, calculated by representing partial voltage10Fourth resistance, U, calculated by representing the partial voltageC1Represents a first voltage, U1Represents a second voltage, UC2Represents a third voltage, U2Represents a fourth voltage, RISO1Indicating the first insulation resistance R to be measuredISO2Representing the second insulation resistance to be measured.
2. The method of claim 1, wherein the first capacitor and the second capacitor are the same type of capacitor.
3. The method of claim 1, wherein the charge control switch, the discharge control switch, the first capacitive discharge control switch, the second capacitive discharge control switch, the voltage acquisition first control switch, the voltage acquisition second control switch, and the voltage acquisition third control switch are each: a triode, a MOS tube or a relay.
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| CN202330559U (en) * | 2011-12-05 | 2012-07-11 | 惠州市亿能电子有限公司 | Automobile insulating resistor detecting circuit |
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