CN117054739A - Earth insulation resistance detection circuit for battery cluster positive and negative bus - Google Patents
Earth insulation resistance detection circuit for battery cluster positive and negative bus Download PDFInfo
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- CN117054739A CN117054739A CN202310951744.0A CN202310951744A CN117054739A CN 117054739 A CN117054739 A CN 117054739A CN 202310951744 A CN202310951744 A CN 202310951744A CN 117054739 A CN117054739 A CN 117054739A
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- 238000009413 insulation Methods 0.000 title claims abstract description 115
- 238000001514 detection method Methods 0.000 title claims abstract description 65
- 238000005070 sampling Methods 0.000 claims abstract description 86
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- 230000009286 beneficial effect Effects 0.000 description 4
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/025—Measuring very high resistances, e.g. isolation resistances, i.e. megohm-meters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/20—Measuring earth resistance; Measuring contact resistance, e.g. of earth connections, e.g. plates
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E60/10—Energy storage using batteries
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Abstract
The invention relates to a circuit for detecting the insulation resistance of a battery cluster positive and negative bus to the earth, belonging to the technical field of industrial control. One end of a first detection branch in the detection circuit is connected to a positive bus of a battery cluster, the other end of the first detection branch is grounded, the detection circuit comprises a first electronic switch and a first sampling resistor which are connected in series, one end of a second detection branch is connected to a negative bus of the battery cluster, the other end of the second detection branch is grounded, the detection circuit comprises a second electronic switch and a second sampling resistor which are connected in series, a voltage acquisition loop acquires voltages at two ends of the first sampling resistor and/or the second sampling resistor, a switch control loop is in communication connection with the voltage acquisition loop, receives data transmitted by the voltage acquisition loop, judges insulation performance according to the received data and states of the two switches, obtains resistance values of the insulation resistors according to the voltages at two ends of the first sampling resistor and the second sampling resistor when the insulation performance is abnormal, and can accurately judge the insulation performance to ground and calculate the resistance values of the insulation resistors when the insulation is abnormal.
Description
Technical Field
The invention relates to a circuit for detecting the insulation resistance of a battery cluster positive and negative bus to the earth, belonging to the technical field of industrial control.
Background
In some larger scale lithium ion battery energy storage power stations, the battery clusters are organized as follows: the minimum constituent unit is a battery cell, a plurality of battery cells are connected in series to form a battery PACK (PACK), and a plurality of battery PACKs are connected in series to form a battery cluster, wherein the number of the battery cells and the number of the battery PACKs are determined according to engineering practical application. The total voltage of the positive electrode and the negative electrode of the battery cluster is 1000V system, 1500V system and the like.
When the insulation performance of the positive and negative buses of the battery cluster to the ground is normal, the insulation resistance value of the buses to the ground tends to infinity. If the insulation performance of the positive and negative electrode buses of the battery cluster to the ground is poor, the insulation resistance of the positive and negative electrode buses of the battery cluster to the ground is reduced, and the whole battery system is at the moment at risk of electric leakage, so that the safety of personnel, equipment and the whole system is ensured, relay switches of the positive electrode and the negative electrode of the battery cluster main are required to be cut off in time, and the ground fault is eliminated. Therefore, it is very important to periodically detect the insulation resistance to the ground of the positive and negative buses of the battery cluster, and the current method for detecting the insulation performance to the ground of the positive and negative buses of the battery cluster adopts a signal injection method, a direct-current voltage signal with a certain frequency is injected into a detection circuit of the insulation resistance, and the insulation resistance is calculated by measuring the fed-back direct-current signal, but the injected pulse signal is a low-frequency carrier pulse signal and is interfered by external current, so that the monitoring result of the insulation resistance is interfered.
Disclosure of Invention
The invention aims to provide a circuit for detecting the insulation resistance of a battery cluster anode bus and a battery cluster cathode bus to the earth, which is used for solving the problem of inaccurate insulation resistance of the battery cluster detected by an active method.
In order to achieve the above object, the present invention provides a method comprising:
the invention relates to a circuit for detecting the insulation resistance of a battery cluster anode bus and a cathode bus to the ground, which comprises a first detection branch, a second detection branch and a voltage acquisition loop, wherein one end of the first detection branch is connected to the anode bus of the battery cluster, and the other end of the first detection branch is connected to a grounding end through a third electronic switch, and comprises a first electronic switch, a first voltage dividing resistor and a first sampling resistor which are connected in series; one end of the second detection branch is connected to a negative bus of the battery cluster, and the other end of the second detection branch is connected to a grounding end through a third electronic switch, and the second detection branch comprises a second electronic switch, a second voltage dividing resistor and a second sampling resistor which are connected in series; the first electronic switch, the second electronic switch and the third electronic switch are controlled by a switch control loop, the voltage acquisition loop is used for acquiring voltages at two ends of the first sampling resistor and/or the second sampling resistor, the switch control loop is in communication connection with the voltage acquisition loop and is used for receiving voltage value data transmitted by the voltage acquisition loop, the insulation performance to the ground is judged according to the received voltage value data and states of the three switches, and the resistance value of the insulation resistor is obtained according to the voltages at two ends of the first sampling resistor and/or the second sampling resistor when the insulation performance is abnormal.
The beneficial effects are that: the invention discloses a circuit for detecting the insulation resistance of a battery cluster anode bus and a cathode bus to the ground, which comprises a first detection branch circuit for detecting the insulation performance of the battery cluster cathode bus to the ground, a second detection branch circuit for detecting the insulation performance of the battery cluster anode bus to the ground, and a voltage acquisition circuit, wherein the first detection branch circuit and the second detection branch circuit are respectively provided with a sampling resistor and a switch, the voltage acquisition circuit acquires voltages at two ends of the sampling resistor, and a switch control circuit for controlling the switch judges the insulation performance to the ground according to the voltages at two ends of the sampling resistor and the states of three switches. The circuit has the advantages of simple detection logic design and high detection accuracy, can timely detect the abnormal insulation performance of the positive and negative buses of the battery clusters to the ground, and can also calculate the insulation resistance value during the abnormality. When the detection is not needed, the third electronic switch is disconnected, so that the insulation performance of the battery cluster anode and cathode bus to the ground is reduced due to the existence of an insulation detection circuit.
The first detection branch circuit and the second detection branch circuit are respectively provided with a divider resistor in series, so that the safety of a subsequent switch is ensured, and the damage of the detection circuit caused by overhigh voltage is prevented.
Further, the first electronic switch, the second electronic switch and the third electronic switch all adopt an optical MOS or an electromagnetic relay.
The beneficial effects are that: the detection switch uses the photoMOS or electromagnetic relay to replace the mechanical contact of the traditional relay, so that on one hand, the heating condition caused by overlarge current of the detection loop can be reduced, and on the other hand, the service life of the control loop can be prolonged.
Further, when the insulation performance of the battery cluster negative bus to the ground is detected, the second electronic switch is opened, the first electronic switch and the third electronic switch are closed, if the voltage values of the two ends of the first sampling resistor are zero, the insulation performance of the battery cluster negative bus to the ground is normal, and if the voltage values of the two ends of the first sampling resistor are not zero, the insulation performance of the battery cluster negative bus to the ground is reduced.
The beneficial effects are that: when detecting the insulation resistance of the battery cluster negative electrode bus to the ground, the second electronic switch is opened, the first electronic switch is closed, only the first detection branch is turned on at the moment, the negative electrode insulation resistance to the ground is connected in series in the loop, if the insulation performance to the ground is normal at the moment, the insulation resistance value tends to infinity, the voltages at the two ends of the resistor tend to the total voltage, and then the voltages at the two ends of the first sampling resistor connected in series tend to 0, if the voltages at the two ends of the first sampling resistor are detected to be different from zero, the insulation resistance is proved to have a definite value, and the insulation performance of the battery cluster negative electrode bus to the ground is reduced.
Further, when the insulation resistance of the battery cluster positive electrode bus to the ground is detected, the first electronic switch is opened, the second electronic switch and the third electronic switch are closed, if the voltage values of the two ends of the second sampling resistor are zero, the insulation performance of the battery cluster positive electrode bus to the ground is normal, and if the voltage values of the two ends of the second sampling resistor are not zero, the insulation performance of the battery cluster positive electrode bus to the ground is reduced.
The beneficial effects are that: when the insulation resistance of the battery cluster anode bus to the ground is detected, the first electronic switch is opened, the second electronic switch is closed, only the second detection branch is turned on at the moment, the insulation resistance of the anode to the ground is connected in series in the loop, if the insulation performance to the ground is normal at the moment, the insulation resistance value tends to infinity, the voltages at the two ends of the resistor tend to the total voltage, and then the voltages at the two ends of the serially connected second sampling resistor tend to 0, if the voltages at the two ends of the second sampling resistor are detected to be different from zero, the insulation resistance has a determined value, namely the insulation performance of the battery cluster anode bus to the ground is reduced.
Further, when only the first electronic switch and the third electronic switch are closed, the voltages at two ends of the first sampling resistor are detected to be not zero, and when only the second electronic switch and the third electronic switch are closed, the voltages at two ends of the second sampling resistor are detected to be zero, the fact that the single end of the battery cluster negative bus is grounded is indicated, and at the moment, the insulation resistance value of the battery cluster negative bus to the ground is:
R iso- ＝V BAT ×R P /V p -R tp -R p
wherein R is iso- The insulation resistance value of the battery cluster negative bus to the ground is V BAT R is the total voltage of the battery cluster P For the resistance value of the first sampling resistor, V p R is the voltage value of two ends of the first sampling resistor tp Is the resistance of the divider resistor in the first detection branch.
Further, when only the first electronic switch and the third electronic switch are closed, the voltage at two ends of the first sampling resistor is detected to be zero, and when only the second electronic switch and the third electronic switch are closed, the voltage at two ends of the second sampling resistor is not zero, the single-end grounding of the positive bus of the battery cluster is indicated, and at the moment, the resistance value of the insulation resistor of the positive bus of the battery cluster to the ground is:
R iso+ ＝V BAT ×R n /V n -R tn -R n
wherein R is iso+ The insulation resistance value of the positive bus of the battery cluster to the ground is V BAT R is the total voltage of the battery cluster n The resistance value of the second sampling resistor is V n R is the voltage value of two ends of the second sampling resistor tn Is the resistance of the divider resistor in the second detection branch.
Further, when the voltages at two ends of the first sampling resistor are detected to be not zero when only the first electronic switch and the third electronic switch are closed, and the voltages at two ends of the second sampling resistor are detected to be not zero when only the second electronic switch and the third electronic switch are closed, the fact that the two ends of the positive bus and the negative bus of the battery cluster are grounded is indicated, and at the moment, the insulation resistance value of the positive bus of the battery cluster to the ground and the insulation resistance value of the negative bus of the battery cluster to the ground are satisfied:
[R iso+ //(R tp +R p )]/R iso- ＝V p /(V BAT -V p )
R iso+ /[R iso- //(R tn +R n )]＝(V BAT -V n )/V n
wherein R is iso+ The insulation resistance value R of the positive bus of the battery cluster to the ground is R iso- The insulation resistance value of the battery cluster negative bus to the ground is V BAT R is the total voltage of the battery cluster P For the resistance value of the first sampling resistor, V p R is the voltage value of two ends of the first sampling resistor tp R is the resistance value of the divider resistor in the first detection branch n The resistance value of the second sampling resistor is V n R is the voltage value of two ends of the second sampling resistor tn Is the resistance of the divider resistor in the second detection branch.
Drawings
FIG. 1 is a schematic diagram of a circuit for detecting insulation resistance of a battery cluster anode and cathode bus to ground in an embodiment of the invention;
FIG. 2 is a schematic circuit diagram of a battery cluster negative bus single-end ground in an embodiment of the invention;
fig. 3 is a schematic circuit diagram of the single-end grounding of the positive bus bar of the battery cluster in the embodiment of the invention.
Fig. 4 is a schematic circuit diagram of the embodiment of the invention when only the first electronic switch and the third electronic switch are closed under the condition that the two ends of the positive bus and the negative bus of the battery cluster are grounded;
fig. 5 is a schematic circuit diagram of the embodiment of the invention when only the second electronic switch and the third electronic switch are closed under the condition that the two ends of the positive and negative buses of the battery cluster are grounded.
Detailed Description
An embodiment of a battery cluster positive and negative bus insulation resistance to earth detection circuit:
the invention is described in further detail below with reference to the accompanying drawings.
The battery cluster positive and negative bus-bar earth insulation resistance detection circuit shown in fig. 1 comprises a first detection branch, a second detection branch and a voltage acquisition loop.
One end of the first detection branch is connected to the BAT+ end of the positive electrode bus of the battery cluster, and the other end of the first detection branch is connected to the ground end through a first sampling resistor. The first detection branch circuit comprises a first electronic switch Q1 and a first sampling resistor Rp which are connected in series. The first detection branch circuit also comprises a first voltage dividing resistor Rtp which is serially connected. And the control end for controlling the first electronic switch Q1 is arranged in the switch control loop.
One end of the second detection branch is connected to the negative bus bar BAT-of the battery cluster, and the other end of the second detection branch is connected to the ground terminal. The second detection branch circuit comprises a second electronic switch Q2 and a second sampling resistor Rn which are connected in series. The second detection branch circuit further comprises a serially arranged second voltage dividing resistor Rtn. And a control terminal for controlling the second electronic switch Q2 is disposed in the switch control loop.
The voltage acquisition loop acquires the voltages at two ends of the first sampling resistor and/or the second sampling resistor, and the voltage acquisition loop is in communication connection with the switch control loop. The switch control loop can receive the voltage value data transmitted by the voltage acquisition loop, judge the insulation performance to the ground according to the received voltage value data and the states of the two switches (the first electronic switch and the second electronic switch), and obtain the resistance value of the insulation resistance to the ground according to the voltages at the two ends of the first sampling resistor and the second sampling resistor when the insulation performance is abnormal.
The grounding end is further connected with a third electronic switch Q3 in series, and the control end of the third electronic switch Q3 is also arranged in the switch control loop. All of the 3 electronic switches in this embodiment are photomos or electromagnetic relays. Specifically, the 3 electronic switches in this embodiment may be triode devices such as MOS transistors, photomos, CMOS, etc., or electromagnetic relays, etc., and the specific type of electronic switch may be determined according to actual situations.
When the electronic switch selects the optical MOS, a photosensitive device is arranged in a switch control loop of the first electronic switch and the second electronic switch, and when the received optical signal reaches a threshold value, the optical signal is converted into an electric signal, so that the first electronic switch and the second electronic switch act.
When the electronic switch adopts an electromagnetic relay, the first electronic switch and the second electronic switch are controlled by a switch control loop, namely, coil parts of the first electronic switch and the second electronic switch are arranged in the switch control loop.
Based on the circuit of the embodiment, the specific implementation principle and implementation method are as follows:
firstly, judging whether the insulation performance of the battery cluster negative bus to the ground is normal or not. The second electronic switch Q2 is in an open state, the first electronic switch Q1 and the third electronic switch Q3 are closed, the first detection branch is in a conducting state, and the total voltage of the battery cluster is measured to be V through the voltage acquisition loop BAT . At this time, the voltage collecting loop is used for collecting and judging whether the voltage value Vp at the two ends of the first sampling resistor Rp is 0, if the voltage value Vp at the two ends of the first sampling resistor Rp is 0, the insulation performance of the battery cluster negative bus to the ground is normal; if the current is not 0, the insulation of the battery cluster negative bus bar to the ground is reduced, and the current flow path in the circuit is as follows: the positive bus BAT+ & gt, the first divider resistor Rtp & gt, the first electronic switch Q1 & gt, the first sampling resistor Rp & gt, the third electronic switch Q3 & gt, the insulation resistor Riso & gt of the battery cluster negative bus to the ground & gt & lt- & gt, namely the insulation resistor has the resistance value Riso & lt- & gt.
And secondly, judging whether the insulation performance of the battery cluster anode bus to the ground is normal or not. The first electronic switch Q1 keeps an open state, the second electronic switch Q2 and the third electronic switch Q3 are closed, the second detection branch is in a conducting state, and at the moment, the voltage acquisition loop is used for acquiring and judging whether the voltage value Vn at two ends of the second sampling resistor Rn is 0 or not. If the voltage value Vn at two ends of the second sampling resistor Rn is 0, the insulation performance of the battery cluster positive bus to the ground is normal; if the current is not 0, the insulation of the battery cluster positive electrode bus bar to the ground is reduced, and the current flow path in the circuit is as follows: the insulation resistance Riso+ of the positive electrode bus bar of the battery cluster to the ground, the third electronic switch Q3, the second sampling resistor Rn, the second electronic switch Q2, the second voltage dividing resistor Rtn and the negative electrode bus bar-, wherein the insulation resistance is Riso+.
And if the voltage values detected at both ends of the first sampling resistor Rp and the second sampling resistor Rn are 0, the insulation of the positive bus and the negative bus of the battery cluster to the ground is normal.
If the voltage value Vp at two ends of the first sampling resistor Rp is not 0 when the insulation performance of the battery cluster negative bus to the ground is detected, that is, only the first detection branch is in the on state, and the voltage value Vn at two ends of the second sampling resistor Rn is 0 when the insulation performance of the battery cluster positive bus to the ground is detected, that is, the second detection branch is in the on state, as shown in fig. 2, it indicates that the battery cluster negative bus at this time is grounded at one end, and at this time, the insulation resistance value of the battery cluster negative bus to the ground is deduced according to the following formula:
Vp/Rp＝V BAT /(R tp +R p +R iso- )
at this time, the insulation resistance value of the battery cluster negative bus to the ground is:
R iso- ＝V BAT ×R P /V p -R tp -R p
wherein R is iso- The insulation resistance value of the battery cluster negative bus to the ground is V BAT R is the total voltage of the battery cluster P For the resistance value of the first sampling resistor, V p R is the voltage value of two ends of the first sampling resistor tp Is the resistance of the divider resistor in the first detection branch.
If the voltage Vp at both ends of the first sampling resistor Rp is 0 when the insulation performance of the negative bus of the battery cluster to the ground is detected, and the voltage Vn at both ends of the second sampling resistor Rn is not 0 when the insulation performance of the positive bus of the battery cluster to the ground is detected, as shown in fig. 3, it can be shown that the single-end grounding of the positive bus of the battery cluster at this time is indicated, and the insulation resistance value of the positive bus of the battery cluster to the ground is deduced according to the following formula:
V n /R n ＝V BAT /(R tn +R n +R iso+ )
at this time, the insulation resistance value of the battery cluster positive bus to the ground is:
R iso+ ＝V BAT ×R n /V n -R tn -R n
wherein R is iso+ The insulation resistance value of the positive bus of the battery cluster to the ground is V BAT R is the total voltage of the battery cluster n The resistance value of the second sampling resistor is V n R is the voltage value of two ends of the second sampling resistor tn Is the resistance of the divider resistor in the second detection branch.
As shown in fig. 4 and 5, if the voltage Vp at both ends of the first sampling resistor Rp is not 0 when the insulation performance of the battery cluster anode bus to the earth is detected, and the voltage Vn at both ends of the second sampling resistor Rn is not 0 when the insulation performance of the battery cluster cathode bus to the earth is detected, it indicates that both ends of the battery cluster anode bus are grounded, and at this time, the insulation resistance value of the battery cluster anode bus to the earth and the insulation resistance value of the battery cluster anode bus to the earth simultaneously satisfy:
[R iso+ //(R tp +R p )]/R iso- ＝V p /(V BAT -V p )
R iso+ /[R iso- //(R tn +R n )]＝(V BAT -V n )/V n
wherein V in the formula BAT Both Rp, vp, vn, rtp, rp, rtn, rn are known, and the resistance values of riso+ and Riso-can be calculated by combining the two formulas.
As other embodiments, when the voltage of the battery cluster is relatively low, the first voltage dividing resistor Rtp and the second voltage dividing resistor Rtn in the present embodiment may be omitted, and when the insulation performance to ground is abnormal, that is, when the insulation resistance value calculation is performed, the above formula is given with rtp=0 and rtn=0.
Specific embodiments are given above, but the invention is not limited to the described embodiments. The basic idea of the invention is that the above basic scheme, it is not necessary for a person skilled in the art to design various modified models, formulas, parameters according to the teaching of the invention to take creative effort. Variations, modifications, substitutions and alterations are also possible in the embodiments without departing from the principles and spirit of the present invention.
Claims (7)
1. The circuit is characterized by comprising a first detection branch, a second detection branch and a voltage acquisition loop, wherein one end of the first detection branch is connected to the positive electrode bus of the battery cluster, and the other end of the first detection branch is connected to a grounding end through a third electronic switch, and comprises a first electronic switch and a first sampling resistor which are connected in series; one end of the second detection branch is connected to a negative bus of the battery cluster, and the other end of the second detection branch is connected to a grounding end through a third electronic switch, and the second detection branch comprises a second electronic switch and a second sampling resistor which are connected in series; the first electronic switch, the second electronic switch and the third electronic switch are controlled by a switch control loop, the voltage acquisition loop is used for acquiring voltages at two ends of the first sampling resistor and/or the second sampling resistor, the switch control loop is in communication connection with the voltage acquisition loop and is used for receiving voltage value data transmitted by the voltage acquisition loop, the insulation performance to the ground is judged according to the received voltage value data and states of the three switches, and the resistance value of the insulation resistor is obtained according to the voltages at two ends of the first sampling resistor and/or the second sampling resistor when the insulation performance is abnormal.
2. The circuit for detecting the insulation resistance to the ground of the positive and negative buses of the battery pack according to claim 1, wherein the first electronic switch, the second electronic switch and the third electronic switch are all photomos or electromagnetic relays.
3. The circuit for detecting the insulation resistance of the battery cluster anode and cathode buses to the ground according to claim 2, wherein when the insulation performance of the battery cluster cathode buses to the ground is detected, the second electronic switch is opened, the first electronic switch and the third electronic switch are closed, if the voltage values of the two ends of the first sampling resistor are zero, the insulation performance of the battery cluster cathode buses to the ground is normal, and if the voltage values of the two ends of the first sampling resistor are not zero, the insulation performance of the battery cluster cathode buses to the ground is reduced.
4. The circuit for detecting the insulation resistance of the positive and negative buses of the battery cluster to the ground according to claim 3, wherein when the insulation resistance of the positive bus of the battery cluster to the ground is detected, the first electronic switch is opened, the second electronic switch and the third electronic switch are closed, if the voltage values of the two ends of the second sampling resistor are zero, the insulation performance of the positive bus of the battery cluster to the ground is normal, and if the voltage values of the two ends of the second sampling resistor are not zero, the insulation performance of the positive bus of the battery cluster to the ground is reduced.
5. The circuit for detecting insulation resistance of the anode and cathode buses of the battery cluster to the ground according to claim 2, wherein when the first electronic switch and the third electronic switch are only closed, the voltage across the first sampling resistor is detected to be non-zero, and when the second electronic switch and the third electronic switch are only closed, the voltage across the second sampling resistor is detected to be zero, the single-end grounding of the anode bus of the battery cluster is indicated, and at the moment, the insulation resistance of the anode bus of the battery cluster to the ground is:
R iso- ＝V BAT ×R p /V p -R tp -R p
wherein R is iso- The insulation resistance value of the battery cluster negative bus to the ground is V BAT R is the total voltage of the battery cluster P For the resistance value of the first sampling resistor, V p R is the voltage value of two ends of the first sampling resistor tp Is the resistance of the divider resistor in the first detection branch.
6. The circuit for detecting the insulation resistance of the positive and negative buses of the battery cluster to the ground according to claim 2, wherein when the first electronic switch and the third electronic switch are only closed, the voltage at two ends of the first sampling resistor is detected to be zero, and when the second electronic switch and the third electronic switch are only closed, the voltage at two ends of the second sampling resistor is not zero, the single-end grounding of the positive bus of the battery cluster is indicated, and at the moment, the insulation resistance value of the positive bus of the battery cluster to the ground is:
R iso+ ＝V BAT ×R n /V n –R tn -R n
wherein R is iso+ The insulation resistance value of the positive bus of the battery cluster to the ground is V BAT R is the total voltage of the battery cluster n The resistance value of the second sampling resistor is V n R is the voltage value of two ends of the second sampling resistor tn Is the resistance of the divider resistor in the second detection branch.
7. The circuit for detecting insulation resistance to ground between positive and negative bus bars of a battery cluster according to claim 6, wherein when the voltage across the first sampling resistor is detected to be non-zero when only the first electronic switch and the third electronic switch are closed, and the voltage across the second sampling resistor is detected to be non-zero when only the second electronic switch and the third electronic switch are closed, it indicates that both ends of the positive bus bar and the negative bus bar of the battery cluster are grounded, and at this time, the insulation resistance value between the positive bus bar of the battery cluster and the ground and the insulation resistance value between the negative bus bar of the battery cluster satisfy:
[R iso+ //(R tp +R p )]/R iso- ＝V p /(V BAT -V p )
R iso+ /[R iso- //(R tn +R n )]＝(V BAT -V n )/V n
wherein R is iso+ The insulation resistance value R of the positive bus of the battery cluster to the ground is R iso- The insulation resistance value of the battery cluster negative bus to the ground is V BAT R is the total voltage of the battery cluster P For the resistance value of the first sampling resistor, V p R is the voltage value of two ends of the first sampling resistor tp R is the resistance value of the divider resistor in the first detection branch n The resistance value of the second sampling resistor is V n R is the voltage value of two ends of the second sampling resistor tn Is the resistance of the divider resistor in the second detection branch.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310951744.0A CN117054739A (en) | 2023-07-31 | 2023-07-31 | Earth insulation resistance detection circuit for battery cluster positive and negative bus |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310951744.0A CN117054739A (en) | 2023-07-31 | 2023-07-31 | Earth insulation resistance detection circuit for battery cluster positive and negative bus |
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| CN202310951744.0A Pending CN117054739A (en) | 2023-07-31 | 2023-07-31 | Earth insulation resistance detection circuit for battery cluster positive and negative bus |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117434408A (en) * | 2023-12-15 | 2024-01-23 | 珠海科创储能科技有限公司 | Battery insulation detection circuit, method and device, storage medium and electronic equipment |
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2023
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117434408A (en) * | 2023-12-15 | 2024-01-23 | 珠海科创储能科技有限公司 | Battery insulation detection circuit, method and device, storage medium and electronic equipment |
| CN117434408B (en) * | 2023-12-15 | 2024-03-29 | 珠海科创储能科技有限公司 | Battery insulation detection circuit, method and device, storage medium and electronic equipment |
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