CN211528643U - Battery system insulation detection device - Google Patents
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- CN211528643U CN211528643U CN201921602194.7U CN201921602194U CN211528643U CN 211528643 U CN211528643 U CN 211528643U CN 201921602194 U CN201921602194 U CN 201921602194U CN 211528643 U CN211528643 U CN 211528643U
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Abstract
The embodiment of the utility model discloses battery system insulation detection device relates to the electricity field, can simplify battery system insulation detection device's detection circuitry. The apparatus comprises a voltage signal source for providing a measurement voltage signal; the measuring circuit comprises a positive electrode node connected with the positive electrode of the battery system, a negative electrode node connected with the negative electrode of the battery system, a grounding node used for grounding and an output measuring resistor, wherein a first measuring resistor and a second measuring resistor are connected in series between the positive electrode node and the negative electrode node, one end of the output detecting resistor is connected between the first measuring resistor and the second measuring resistor, and the other end of the output detecting resistor is connected with the grounding node; the voltage measuring unit is connected with the processing unit and used for measuring the target voltage on the output detection resistor; and the processing unit is used for calculating the insulation resistance value of the battery system. The utility model discloses mainly used detects battery system's insulation resistance value and electric leakage position.
Description
Technical Field
The utility model relates to an electricity field especially relates to an insulating detection device of battery system.
Background
With the enhancement of environmental awareness of people in recent years, more and more electric automobiles and energy storage systems are applied to the life of people. The basis of the electric automobile and the energy storage system is a battery system, the safety problem of the battery system is particularly important, and the insulation resistance is an important safety parameter. When the insulation resistance of the battery system fails (GB/T18384.1-2001 electric vehicle safety requirement first part: the insulation resistance specified in the vehicle-mounted energy storage device should be more than 500 omega/V), on one hand, the battery system can cause electric shock hazard to people, on the other hand, the battery system can be influenced, and the battery system and the electric equipment connected with the battery system can be damaged.
Therefore, it is important to quickly and accurately detect the insulation resistance of the battery system. The insulation resistance detection by a current sensing method, a balanced bridge method and an auxiliary power supply method appears in the market at present, but the detection circuits used for detecting the insulation resistance by the current detection methods are quite complex.
SUMMERY OF THE UTILITY MODEL
In view of this, the embodiment of the present invention provides an insulation detection device for battery system, which can simplify the detection circuit of the insulation detection device for battery system.
In order to achieve the above object, the embodiments of the present invention adopt the following technical solutions:
an embodiment of the utility model provides an insulating detection device of battery system, include: the voltage signal source is used for providing a first measurement voltage and a second measurement voltage, and the first measurement voltage is not equal to the second measurement voltage; the measuring circuit comprises an anode node, a cathode node and a grounding node, wherein the anode node is used for being connected with the anode of the battery system, the cathode node is used for being connected with the cathode of the battery system, the grounding node is used for being grounded, a first measuring resistor and a second measuring resistor are connected in series between the anode node and the cathode node, the measuring circuit further comprises an output detection resistor, one end of the output detection resistor is connected between the first measuring resistor and the second measuring resistor, and the other end of the output detection resistor is connected with the grounding node; the voltage measuring unit is connected with two ends of the output detection resistor and used for measuring a target voltage applied to the output detection resistor and outputting the target voltage to the processing unit; and the processing unit is connected with the voltage measuring unit and used for receiving the target voltage and calculating the insulation resistance value of the battery system according to the first measuring voltage, the second measuring voltage, the resistance value of the first measuring resistor, the resistance value of the second measuring resistor, the resistance value of the output detection resistor and the target voltage.
Optionally, the voltage signal source includes a first signal source and a second signal source, the first signal source and the second signal source are respectively used for being connected to the battery system, the first signal source is used for providing the first measurement voltage, and the second signal source is used for providing the second measurement voltage.
Optionally, the apparatus further includes a first switch and a second switch, the first switch is connected between the first signal source and the battery system, and the second switch is connected between the second signal source and the battery system.
Optionally, the states of the first switch and the second switch include: in a first state, the first switch is connected, and the second switch is disconnected; in the second state, the first switch is off, and the second switch is on.
Optionally, when the first switch is turned on and the second switch is turned off, the voltage measuring unit outputs the measured voltage as a first target voltage; when the first switch is turned off and the second switch is turned on, the voltage measuring unit outputs the measured voltage as a second target voltage.
Optionally, the battery system includes N battery modules connected in series, where N is a positive integer.
Optionally, the processing unit is further configured to determine a voltage from a negative electrode of the battery system to a leakage position and a voltage from a positive electrode of the battery system to a leakage point according to the first measurement voltage, the second measurement voltage, the resistance value of the first measurement resistor, the resistance value of the second measurement resistor, the resistance value of the output detection resistor, and the target voltage.
Optionally, the processing unit is further configured to determine the leakage position of the battery system according to a voltage from a negative electrode of the battery system to the leakage position and a voltage from a positive electrode of the battery system to the leakage position.
Optionally, the device further comprises a display unit, and the display unit is connected with the processing unit and used for displaying the insulation resistance value and/or the leakage position of the battery system.
Optionally, the device may further include a judgment unit and an alarm unit, wherein one end of the judgment unit is connected to the processing unit, and the other end of the judgment unit is connected to the alarm unit; the processing unit is further used for calculating a ratio of the insulation resistance value to the total voltage of the battery system, and the judging unit is used for judging whether the ratio of the insulation resistance value to the total voltage of the battery system is lower than a preset safety value or not; the alarm unit is used for giving an alarm when the ratio of the insulation resistance value to the total voltage of the battery system is lower than a preset safety value.
The insulation detection device for a battery system provided in this embodiment utilizes the characteristic that the current in the output detection resistor is equal to the current in the insulation resistor, and measures the target voltage applied to the output detection resistor through the voltage measurement unit, and sends the first target voltage measured when the voltage signal source injects the first measurement voltage into the housing of the battery system and the second target voltage measured when the voltage signal source injects the second measurement voltage into the housing of the battery system to the processing unit, so that the processing unit calculates the insulation resistance value of the battery system according to the first measurement voltage, the second measurement voltage, the resistance value of the first measurement resistor, the resistance value of the second measurement resistor, the resistance value of the output detection resistor, the first target voltage and the second target voltage. The battery system insulation detection device of the embodiment can obtain the insulation resistance of the battery system only through one voltage signal source capable of outputting two voltage signals, one measurement circuit comprising three resistors, one voltage measurement unit and one processing unit, so that the detection circuit of the battery system insulation detection device is more simplified.
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 is a schematic view of a connection relationship between a battery system insulation detection device and a battery system according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a connection relationship between the measurement circuit, the voltage measurement unit and the processing unit according to an embodiment of the present invention.
Detailed Description
The embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
It should be understood that the described embodiments are only some embodiments of the invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.
Fig. 1 and fig. 2 are a battery system insulation detection device according to an embodiment of the present invention, as shown in fig. 1 and fig. 2, the device includes: the voltage signal source 11 is used for being connected with the battery system 2, the voltage signal source 11 is used for providing a first measurement voltage and a second measurement voltage, and the first measurement voltage and the second measurement voltage are not equal; the measurement circuit 12 comprises a positive electrode node, a negative electrode node and a ground node, wherein the positive electrode node is used for being connected with a positive electrode of the battery system 2, the negative electrode node is used for being connected with a negative electrode of the battery system 2, the ground node is used for being grounded, a first measurement resistor Rm1 and a second measurement resistor Rm2 are connected between the positive electrode node and the negative electrode node in series, the measurement circuit further comprises an output detection resistor Ro, one end of the output detection resistor Ro is connected between the first measurement resistor Rm1 and the second measurement resistor Rm2, and the other end of the output detection resistor Ro is connected with the ground node; a voltage measuring unit 13 connected to both ends of the output detection resistor Ro, for measuring a target voltage applied to the output detection resistor Ro and outputting the target voltage to a processing unit 14; and the processing unit 14 is connected with the voltage measuring unit 13 and is used for receiving the target voltage and calculating the insulation resistance Rx of the battery system 2 according to the first measuring voltage, the second measuring voltage, the resistance value of the first measuring resistor Rm1, the resistance value of the second measuring resistor Rm2, the resistance value of the output detection resistor Ro and the target voltage.
In the embodiment, it should be understood that, in the actual use process of the current battery system, severe environmental conditions, such as permeation of moisture into the battery system and corrosion of acid and alkali gases on the battery system, may be encountered, and particularly, after the battery system is permeated by moisture, insulation damage is very likely to occur to cause electric leakage; in this case, the resistance formed in the path of the leakage is referred to as an insulation resistance. In order to facilitate understanding of the measurement principle of the battery system insulation detection device provided in the embodiment of the present invention, a virtual insulation resistor Rx is depicted in the battery system 2 shown in fig. 1, one end of the insulation resistor Rx is connected to the leakage position of the battery system, and the other end of the insulation resistor Rx is connected to the housing (i.e., the vehicle body) of the battery system (i.e., the insulation resistor is actually a resistor between the leakage position of the battery system and the housing of the battery system).
As shown in fig. 1, optionally, the voltage signal source 11 may include a first signal source and a second signal source, the first signal source and the second signal source are respectively used for connecting with the battery system 2, the first signal source is used for providing the first measurement voltage Va1, and the second signal source is used for providing the second measurement voltage Va 2.
As an alternative to the above embodiment, as shown in fig. 1, the apparatus may further include a first switch S1 and a second switch S2, the first switch S1 is connected between the first signal source and the battery system 2, and the second switch S2 is connected between the second signal source and the battery system 2.
In this embodiment, the states of the first switch and the second switch may include: a first state in which the first switch is on and the second switch is off, at which time the first signal source injects a first measurement voltage into a housing VGND of the battery system; in a second state, the first switch is off and the second switch is on, at which time the second signal source injects a second measurement voltage into the housing VGND of the battery system.
Optionally, when the first switch is turned on and the second switch is turned off (i.e. when the first signal source injects a first measurement voltage into the enclosure VGND of the battery system), the voltage measurement unit outputs the measured voltage as a first target voltage; when the first switch is turned off and the second switch is turned on (i.e., when the second signal source injects a second measurement voltage into the housing VGND of the battery system), the voltage measurement unit outputs the measured voltage as a second target voltage.
Specifically, analyzing the measurement principle of the circuit shown in fig. 1 can obtain the following equation set:
Ix＝(Va-Vx)/Rx；
Ix＝(Vx+V1-Vo)/Rm1+(Vx-V2-Vo)/Rm2；
Ix＝Vo/Ro，Ix＝Io；
Vb＝V1+V2；
wherein Ix is the current in the insulation resistor Rx, Vx is the voltage at the leakage position of the battery system, Va is the voltage injected into the battery case by the voltage signal source, V1 is the voltage between the leakage position of the battery system and the positive electrode of the battery system, V2 is the voltage between the leakage position of the battery system and the negative electrode of the battery system, Vo is the voltage applied to the output detection resistor Ro, Io is the current in the output detection resistor Ro, and Vb is the total voltage of the battery system.
After injecting the first measurement voltage Va1 into the battery system enclosure VGND via switch S1, the following system of equations may be obtained:
Ix1＝(Va1-Vx1)/Rx；
Ix1＝(Vx1+V1-Vo1)/Rm1+(Vx1-V2-Vo1)/Rm2；
Ix1＝Vo1/Ro；
Vb＝V1+V2；
after injecting the first measurement voltage Va2 into the battery system enclosure VGND via switch S2, the following system of equations may be obtained:
Ix2＝(Va2-Vx2)/Rx；
Ix2＝(Vx2+V1-Vo2)/Rm1+(Vx2-V2-Vo2)/Rm2；
Ix2＝Vo2/Ro；
Vb＝V1+V2；
rm1, Rm2, Ro, Va1, Va2, Vo1, Vo2 and Vb in the seven equation sets are known variables, Rx, V1, V2, Ix1, Vx1, Ix2 and Vx2 in the seven equation sets are unknown variables, and the equation sets are solved to obtain the following equations:
Rx＝(Rm1*Ro*Va1-Rm1*Ro*Va2+Rm2*Ro*Va1-Rm2*Ro*Va2-Rm1*Rm2*Vo1+Rm1*Rm2*Vo2-Rm1*Ro*Vo1+Rm1*Ro*Vo2-Rm2*Ro*Vo1+Rm2*Ro*Vo2)/(Rm1*Vo1-Rm1*Vo2+Rm2*Vo1-Rm2*Vo2)；
as can be seen, the insulation resistance Rx of the battery system can be calculated from the above equation.
Therefore, the processing unit of the battery system insulation detection device may calculate the resistance value of the insulation resistor Rx according to the formula for calculating Rx.
Optionally, according to the seven equations, the voltage between the leakage position of the battery system and the positive electrode of the battery system may also be obtained:
V1＝(Rm1*Va1*Vo2-Rm1*Va2*Vo1+Rm2*Va1*Vo2-Rm2*Va2*Vo1+Rm1*Vb*Vo1-Rm1*Vb*Vo2)/((Rm1+Rm2)*(Vo1-Vo2))；
and the voltage between the leakage position of the battery system and the negative pole of the battery system is as follows:
V2＝-(Rm1*Va1*Vo2-Rm1*Va2*Vo1+Rm2*Va1*Vo2-Rm2*Va2*Vo1-Rm2*Vb*Vo1+Rm2*Vb*Vo2)/((Rm1+Rm2)*(Vo1-Vo2))；
at this time, the processing unit of the battery system insulation detection device may calculate a voltage V1 between the leakage position of the battery system and the positive pole of the battery system and a voltage V2 between the leakage position of the battery system and the negative pole of the battery system according to the above formula so as to determine the leakage position of the battery system.
Optionally, the resistances of the first measurement resistor Rm1 and the second measurement resistor Rm2 may be equal, for example: rm 1-Rm 2-Rm, when:
Rx＝(2*Ro*Va1-2*Ro*Va2-Rm*Vo1+Rm*Vo2-2*Ro*Vo1+2*Ro*Vo2)/(2*(Vo1-Vo2))；
V1＝(2*Va1*Vo2-2*Va2*Vo1+Vb*Vo1-Vb*Vo2)/(2*Vo1-2*Vo2)；
V2＝-(2*Va1*Vo2-2*Va2*Vo1-Vb*Vo1+Vb*Vo2)/(2*(Vo1-Vo2))；
at this time, the processing unit may calculate an insulation resistance Rx of the battery system, a voltage V1 between the leakage position and the positive electrode of the battery system, and a voltage V2 between the leakage position and the negative electrode of the battery system according to the above three formulas, respectively.
As an optional implementation manner of the foregoing embodiment, the battery system may include N battery modules connected in series, where N is a positive integer.
At this time, the processing unit may determine the leakage point position of the battery system according to a voltage V1 between the leakage point of the battery system and the positive pole of the battery system and a voltage V2 between the leakage point of the battery system and the negative pole of the battery system. Specifically, the processing unit may determine the leakage position of the battery system according to the formula P ═ N × V1/(V1+ V2), for example: when P is a positive integer, the junction of the No. P battery and the No. P +1 battery is subjected to electric leakage from the positive pole of the battery system; when P is decimal, taking the integer part M of the decimal P, the M +1 th battery of the battery system leaks electricity from the positive pole of the battery system. The battery system insulation detection device that this embodiment provided can be fast accurate find out the electric leakage point position of series battery system, need not to carry out troubleshooting one by one to each battery module of series battery system, can improve maintenance efficiency.
Optionally, the device may further include a display unit, connected to the processing unit, for displaying the insulation resistance value and/or a leakage position of the battery system. In this embodiment, after the processing unit calculates the insulation resistance value and/or the leakage position of the battery system, the display unit may display the insulation resistance value and/or the leakage position of the battery system, so as to improve the use experience of the insulation detection device of the battery system.
Optionally, the device may further include a judgment unit and an alarm unit, wherein one end of the judgment unit is connected to the processing unit, and the other end of the judgment unit is connected to the alarm unit; the processing unit may be further configured to calculate a ratio of the insulation resistance value to a total voltage of the battery system, and the determining unit is configured to determine whether the ratio of the insulation resistance value to the total voltage of the battery system is lower than a preset safety value; the alarm unit is used for giving an alarm when the ratio of the insulation resistance value to the total voltage of the battery system is lower than a preset safety value.
In this embodiment, the preset safety value may be 500 Ω/V, and when the insulation resistance value of the battery system is smaller than the preset safety value, the alarm unit may alarm, so that, on one hand, the danger of electric shock of the personnel during electric leakage of the battery system may be reduced, and on the other hand, the maintenance personnel may be notified to maintain the battery system in time, thereby reducing the damage to the battery system and the electrical equipment connected with the battery system.
The insulation detection device for a battery system provided in this embodiment utilizes the characteristic that the current in the output detection resistor is equal to the current in the insulation resistor, measures the target voltage applied to the output detection resistor through the voltage measurement unit, and sends the first target voltage measured when the voltage signal source injects the first measurement voltage into the housing of the battery system and the second target voltage measured when the voltage signal source injects the second measurement voltage into the housing VGND of the battery system to the processing unit, so that the processing unit calculates the insulation resistance value of the battery system according to the first measurement voltage, the second measurement voltage, the resistance value of the first measurement resistor, the resistance value of the second measurement resistor, the resistance value of the output detection resistor, and the first target voltage and the second target voltage. The battery system insulation detection device of the embodiment can obtain the insulation resistance of the battery system only through one voltage signal source capable of outputting two voltage signals, one measurement circuit comprising three resistors, one voltage measurement unit and one processing unit, so that the detection circuit of the battery system insulation detection device is more simplified.
It is noted that, herein, 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. The term "comprising", without further limitation, means that the element so defined is not excluded from the group consisting of additional identical elements in the process, method, article, or apparatus that comprises the element.
The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. An insulation detecting device for a battery system, comprising:
the voltage signal source is used for providing a first measurement voltage and a second measurement voltage, and the first measurement voltage is not equal to the second measurement voltage;
the measuring circuit comprises an anode node, a cathode node and a grounding node, wherein the anode node is used for being connected with the anode of the battery system, the cathode node is used for being connected with the cathode of the battery system, the grounding node is used for being grounded, a first measuring resistor and a second measuring resistor are connected in series between the anode node and the cathode node, the measuring circuit further comprises an output detection resistor, one end of the output detection resistor is connected between the first measuring resistor and the second measuring resistor, and the other end of the output detection resistor is connected with the grounding node;
the voltage measuring unit is connected with two ends of the output detection resistor and used for measuring a target voltage applied to the output detection resistor and outputting the target voltage to the processing unit;
and the processing unit is connected with the voltage measuring unit and used for receiving the target voltage and calculating the insulation resistance value of the battery system according to the first measuring voltage, the second measuring voltage, the resistance value of the first measuring resistor, the resistance value of the second measuring resistor, the resistance value of the output detection resistor and the target voltage.
2. The apparatus of claim 1, wherein the voltage signal source comprises a first signal source and a second signal source, the first signal source and the second signal source are respectively configured to be connected to the battery system, the first signal source is configured to provide the first measurement voltage, and the second signal source is configured to provide the second measurement voltage.
3. The apparatus of claim 2, further comprising a first switch connected between the first signal source and the battery system and a second switch connected between the second signal source and the battery system.
4. The apparatus of claim 3, wherein the states of the first switch and the second switch comprise:
in a first state, the first switch is connected, and the second switch is disconnected;
in the second state, the first switch is off, and the second switch is on.
5. The apparatus of claim 4,
when the first switch is connected and the second switch is disconnected, the voltage measuring unit outputs the measured voltage as a first target voltage;
when the first switch is turned off and the second switch is turned on, the voltage measuring unit outputs the measured voltage as a second target voltage.
6. The device according to any one of claims 1 to 5, wherein the battery system comprises N battery modules connected in series, wherein N is a positive integer.
7. The apparatus of claim 6, wherein the processing unit is further configured to determine a voltage from a cathode to a drain location of the battery system and a voltage from a cathode to a drain location of the battery system according to the first measurement voltage, the second measurement voltage, a resistance value of the first measurement resistor, a resistance value of the second measurement resistor, a resistance value of the output detection resistor, and the target voltage.
8. The apparatus of claim 7,
the processing unit is further used for determining the electric leakage position of the battery system according to the voltage from the negative electrode of the battery system to the electric leakage position and the voltage from the positive electrode of the battery system to the electric leakage position.
9. The device of claim 8, further comprising a display unit connected to the processing unit for displaying the insulation resistance value and/or the location of a leakage of the battery system.
10. The device according to claim 1, characterized in that the device further comprises a judging unit and an alarm unit, wherein one end of the judging unit is connected with the processing unit, and the other end of the judging unit is connected with the alarm unit; wherein the content of the first and second substances,
the processing unit is further used for calculating the ratio of the insulation resistance value to the total voltage of the battery system;
the judging unit is used for judging whether the ratio of the insulation resistance value to the total voltage of the battery system is lower than a preset safety value or not;
the alarm unit is used for giving an alarm when the ratio of the insulation resistance value to the total voltage of the battery system is lower than a preset safety value.
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| CN110568377A (en) * | 2019-09-25 | 2019-12-13 | 北京动力源新能源科技有限责任公司 | Battery system insulation detection device |
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