CN108646187B - Battery system insulation resistance detection circuit - Google Patents
Battery system insulation resistance detection circuit Download PDFInfo
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- CN108646187B CN108646187B CN201810369352.2A CN201810369352A CN108646187B CN 108646187 B CN108646187 B CN 108646187B CN 201810369352 A CN201810369352 A CN 201810369352A CN 108646187 B CN108646187 B CN 108646187B
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Abstract
The invention relates to a detection circuit and a method for insulation resistance of a battery system, wherein the circuit comprises a battery pack module, a detection circuit module and an insulation resistance module, the insulation resistance module comprises a first insulation resistance Rp and a second insulation resistance Rn, one end of the first insulation resistance Rp is connected to a positive bus of the battery pack module, the other end of the first insulation resistance Rp is connected to a ground line PE and is also connected to a negative bus of the battery pack module through the second insulation resistance Rn, the detection circuit module comprises a first connection end V1 and a second connection end V2, the first connection end V1 is connected to the positive bus, the second connection end V2 is connected to the negative bus, the first insulation resistance Rp is an equivalent resistance of leakage resistance connected between the positive bus of the battery pack module and the ground line PE, the second insulation resistance Rn is an equivalent resistance of leakage resistance connected between the negative bus of the battery pack module and the ground line PE, therefore, the accuracy of detecting the resistance values of the first insulation resistor Rp and the second insulation resistor Rn is effectively improved.
Description
Technical Field
The invention relates to the technical field of power supply systems, in particular to a battery system insulation resistance detection circuit and a battery system insulation resistance detection method.
Background
In some large-scale battery systems, such as energy storage power stations and container type energy storage systems, since the voltage on the battery side is high, generally approaching 1KV, in order to ensure the personal safety of operators, the safety of system equipment and the safety of the surrounding environment, it is necessary to detect the insulation resistance of the battery side dc bus to the ground in the battery system.
The existing insulation resistance detection circuit can increase the leakage current of a battery system when being accessed, in order to reduce the influence of the detection circuit on the leakage current of the whole battery system, the detection judgment is often carried out by using an extremely weak detection signal, the detection precision of the detection circuit can be reduced by reducing the strength of the detection signal at that time, and in the occasion of severe electromagnetic environment, the detection signal is extremely easy to be interfered, and the detection result precision is not high.
Disclosure of Invention
The invention aims to solve the technical problem of providing a battery system insulation resistance detection circuit and a battery system insulation resistance detection method aiming at the defects in the prior art.
The technical means adopted by the invention to solve the technical problems is to provide a battery system insulation resistance detection circuit, which comprises a battery pack module, a detection circuit module and an insulation resistance module, wherein the insulation resistance module comprises a first insulation resistance Rp and a second insulation resistance Rn, one end of the first insulation resistance Rp is connected to a positive bus of the battery pack module, the other end of the first insulation resistance Rp is connected to a negative bus of the battery pack module through the second insulation resistance Rn, the other end of the first insulation resistance Rp is also connected to a ground wire PE, the detection circuit module comprises a first connecting end V1 and a second connecting end V2, the first connecting end V1 is connected to a line between the first insulation resistance Rp and the positive bus, the second connecting end V2 is connected to a line between the second insulation resistance Rn and the negative bus, the first insulation resistance Rp is an equivalent resistance of a leakage resistance connected between a positive bus of the battery module and the ground line PE, and the second insulation resistance Rn is an equivalent resistance of a leakage resistance connected between a negative bus of the battery module and the ground line PE.
Further, the detection circuit module includes a processor unit, a first signal processing unit, a second signal processing unit and an adjustable voltage boosting unit, the first connection terminal V1 is connected to a first terminal of a first switch K1, a second terminal of the first switch K1 is connected to a first terminal of a second switch K2, a second terminal of the second switch K2 is connected to an output terminal hv of the adjustable voltage boosting unit, the output terminal hv is further connected to a second terminal of a third switch K3, a second terminal of a fourth switch K4 and a second terminal of a fifth switch K5, a first terminal of the fifth switch K5 is connected to a second terminal of a sixth switch K6, a first terminal of the sixth switch K6 is connected to the second connection terminal V2, a first terminal of the third switch K3 and a first terminal of a fourth switch K4 are both connected to the ground wire PE, and a second terminal of the first switch K1 is further connected to the ground wire PE through a first resistor R1 in sequence, A second resistor R2, a third resistor R3 and a fourth resistor R4 are connected to a first end of the fifth switch K5, an input end of the first signal processing unit is connected to a line between the first resistor R1 and the second resistor R2, an input end of the second signal processing unit is connected to a line between the third resistor R3 and the fourth resistor R4, the processor unit is connected with an output end of the first signal processing unit and an output end of the second signal processing unit, an input end of the adjustable boosting unit is connected to an output end of the processor unit, a first end of the third switch K3 and a first end of the fourth switch K4 are both connected to a line between the second resistor R2 and the third resistor R3, a first end of the third switch K3 and a first end of the fourth switch K4 are also connected to a ground line PE, and a first end of the first switch K1, a second switch K2 and a first end of the fourth switch K4 are also connected to a ground line PE, The signal terminals of the third switch K3, the fourth switch K4, the fifth switch K5, and the sixth switch K6 are connected to the processor unit.
Further, the detection circuit module further includes a fifth resistor R5 and a sixth resistor R6, one end of the fifth resistor R5 is connected to the first connection terminal V1, the other end of the fifth resistor R5 is connected to the second connection terminal V2 through the sixth resistor R6, and the other end of the fifth resistor R5 is further connected to the processor unit.
Further, the battery module includes a battery pack, a positive electrode of which is connected to the positive bus bar through a seventh switch K7, and a negative electrode of which is connected to the negative bus bar through an eighth switch K8.
Further, the battery module further includes a load, and the positive bus bar is connected to the negative bus bar through the load.
In another aspect, the present invention further provides a battery system insulation resistance detection method, applied to the battery system insulation resistance detection circuit, including:
acquiring the output voltage of the battery pack module;
acquiring a first overcurrent of the first insulation resistor Rp and the second insulation resistor Rn;
and calculating the resistance values of the first insulation resistor Rp and the second insulation resistor Rn according to the output voltage and the first overcurrent.
Further, the step of calculating the resistance values of the first insulation resistance Rp and the second insulation resistance Rn according to the output voltage and the first overcurrent specifically includes:
acquiring internal voltage signals and internal current signals of a plurality of internal resistors connected in series in a detection circuit module, wherein series bodies of the plurality of internal resistors are connected in parallel with a first insulation resistor Rp and a second insulation resistor Rn;
calculating resistance values of the internal resistors according to the internal voltage signals and the internal current signals;
and calculating the resistance values of the first insulation resistance Rp and the second insulation resistance Rn according to a preset algorithm and the resistance values of the plurality of internal resistors.
Further, the step of obtaining the output voltage of the battery module may be preceded by:
the disconnection detection circuit module comprises a first connection end V1 and a second connection end V2 and the connection between the positive bus and the negative bus of the battery pack module;
and detecting whether the internal voltage of the detection circuit module is greater than a preset value, and if so, sending an alarm signal to external equipment.
By adopting the technical scheme, the invention at least has the following beneficial effects: in the embodiment of the present invention, the first connection end V1 of the detection circuit module is connected to the first insulation resistor Rp, and the second connection end V2 of the detection circuit module is connected to the second insulation resistor Rn, wherein the first insulation resistor Rp is an equivalent resistor of a leakage resistor connected between a positive bus of the battery pack module and the ground line PE, the second insulation resistor Rn is an equivalent resistor of a leakage resistor connected between a negative bus of the battery pack module and the ground line PE, and the detection circuit module can detect currents passing through the first insulation resistor Rp and the second insulation resistor Rn, so as to analyze and calculate resistance values of the first insulation resistor Rp and the second insulation resistor Rn; on the other hand, the detection circuit comprises the adjustable booster circuit, high voltage can be introduced into the shell at the positive bus and the negative bus of the battery pack module for insulation detection, and the leakage condition can be normally detected even if the switches K7-K8 of the battery pack module are not closed; the detection circuit can generate high voltage, is not influenced by the voltage of the battery pack module during detection, improves the detection universality and flexibility, can properly amplify detection signals by introducing the detection circuit in a short time during actual measurement, and improves the detection precision and the anti-interference capability; the resistance values of the resistors R1-R4 are reduced, and the multi-switch on-off combination of the control switches K1-K6 improves the fault self-detection capability of the detection circuit and improves the detection precision.
Drawings
Fig. 1 is a block diagram of an embodiment of a battery system insulation resistance detection circuit according to the present invention.
Fig. 2 is a schematic circuit diagram of an embodiment of the insulation resistance detection circuit of the battery system according to the present invention.
Fig. 3 is a schematic flow chart of an embodiment of the method for detecting insulation resistance of a battery system according to the present invention.
Fig. 4 is a flowchart illustrating step S3 of an embodiment of the method for detecting insulation resistance of a battery system according to the present invention.
Fig. 5 is a flowchart illustrating step S1 of an embodiment of the method for detecting insulation resistance of a battery system according to the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
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.
Referring to fig. 1 to 2, the present invention provides a technical solution: a battery system insulation resistance detection circuit comprises a battery pack module 1, a detection circuit module 2 and an insulation resistance module 3, wherein the insulation resistance module 3 comprises a first insulation resistance Rp and a second insulation resistance Rn, one end of the first insulation resistance Rp is connected to a positive bus of the battery pack module 1, the other end of the first insulation resistance Rp is connected to a negative bus of the battery pack module 1 through the second insulation resistance Rn, the other end of the first insulation resistance Rp is also connected to a ground line PE, the detection circuit module 2 comprises a first connection end V1 and a second connection end V2, the first connection end V1 is connected to a line between the first insulation resistance Rp and the positive bus, the second connection end V2 is connected to a line between the second insulation resistance Rn and the negative bus, the first insulation resistance Rp is an equivalent resistance of a leakage resistance connected between the positive bus and the ground line PE of the battery pack module, the second insulation resistance Rn is an equivalent resistance of a leakage resistance connected between the negative bus of the battery module and the ground line PE.
In implementation, the positive output terminal of the battery module 1 is connected to the positive bus bar, the negative output terminal of the battery module 1 is connected to the negative bus bar, the positive bus bar is further connected to the negative bus bar through the first insulation resistor Rp and the second insulation resistor Rn in sequence, the first connection terminal V1 and the second connection terminal V2 of the detection circuit module 2 are connected to the positive bus bar and the negative bus bar respectively, and the detection circuit module 2 analyzes and calculates the resistance values of the first insulation resistor Rp and the second insulation resistor Rn by detecting the voltage values output by the battery module 1 to the first insulation resistor Rp and the second insulation resistor Rn and the current values flowing through the first insulation resistor Rp and the second insulation resistor Rn.
In an alternative embodiment, the detection circuit module includes a processor unit U1, a first signal processing unit U2, a second signal processing unit U3, and an adjustable voltage boosting unit U4, the first connection terminal V1 is connected to a first terminal of a first switch K1, a second terminal of the first switch K1 is connected to a first terminal of a second switch K2, a second terminal of the second switch K2 is connected to an output terminal hv of the adjustable voltage boosting unit U4, the output terminals hv are further connected to a second terminal of a third switch K3, a second terminal of a fourth switch K4, and a second terminal of a fifth switch K5, respectively, a first terminal of the fifth switch K5 is connected to a second terminal of a sixth switch K6, a first terminal of the sixth switch K6 is connected to the second connection terminal V2, a first terminal of the third switch K84 and a first terminal of the fourth switch K4 are both connected to the ground line PE, and a second terminal R1R of the first switch K1 is sequentially connected to the ground line, A second resistor R2, a third resistor R3 and a fourth resistor R4 are connected to a first terminal of the fifth switch K5, an input terminal of the first signal processing unit U2 is connected to a line between the first resistor R1 and the second resistor R2, an input terminal of the second signal processing unit U3 is connected to a line between the third resistor R3 and the fourth resistor R4, the processor unit U1 is connected to an output terminal of the first signal processing unit U2 and an output terminal of the second signal processing unit U3, an input terminal of the adjustable voltage boosting unit U4 is connected to an output terminal of the processor unit U1, a first terminal of the third switch K3 and a first terminal of the fourth switch K4 are both connected to a line between the second resistor R2 and the third resistor R3, and a first terminal of the third switch K5 and a first terminal of the fourth switch K4 are also connected to a ground PE, the first switch K24 is connected to a ground PE, and a second terminal of the fourth switch K4 is connected to a ground line, The second switch K2, the third switch K3, the fourth switch K4, the fifth switch K5 and the sixth switch K6 each include a first end, a second end and a signal line end, as shown in fig. 2, each switch includes a first end 1, a second end 2 and a signal line end 3, the signal line end of the first switch K1, the signal line end of the second switch K2, the signal line end of the third switch K3, the signal line end of the fourth switch K4, the signal line end of the fifth switch K5 and the signal line end of the sixth switch K6 are all connected to the processor unit U1, and the processor unit U1 is connected to the first switch K1, the second switch K2, the third switch K3, the fourth switch K4, the fifth switch K5 and the sixth switch K6 through signal lines, so as to control the opening and closing of each switch.
The embodiment reduces the influence of the detection circuit on the electric leakage of the whole battery system by reducing the resistance values of the resistors R1-R4 and controlling the on-off of the 6 switches K1-K6, can properly amplify detection signals, and improves the detection precision and the anti-interference capability.
In implementation, the detection circuit module 2 further includes a fifth resistor R5 and a sixth resistor R6, one end of the fifth resistor R5 is connected to the first connection terminal V1, the other end of the fifth resistor R5 is connected to the second connection terminal V2 through the sixth resistor R6, and the other end of the fifth resistor R5 is further connected to the processor unit U1.
The battery module 1 includes a battery pack U5, the positive pole of the battery pack U5 is connected to the positive bus through a seventh switch K7, and the negative pole of the battery pack U5 is connected to the negative bus through an eighth switch K8. The battery module 1 further comprises a load U6, the positive bus bar being connected to the negative bus bar by the load U6.
Specifically, when detection is performed, the first switch K1, the second switch K2, the third switch K3, the fourth switch K4, the fifth switch K5 and the sixth switch K6 are turned off first, at this time, a first signal S1 and a second signal S2 which are respectively sent to the processor unit U1 by the first signal processing unit U2 and the second signal processing unit U3 are detected, and if any one of the first signal S1 and the second signal S2 is greater than a first preset value, the detection circuit fails, and stops subsequent actions and sends warning information to a user terminal through the processor unit U1 to remind a user of troubleshooting.
When the first signal S1 and the second signal S2 are both smaller than the first preset value, a third signal S3 sent by a line between the fifth resistor R5 and the sixth resistor R6 to a processor unit U1 is detected, and if the third signal S3 is greater than the second preset value, the seventh switch K7 and the eighth switch K8 are in a closed state, a battery pack U5 has an output, the processor unit U1 can calculate a battery voltage Vbat0 of the battery pack U5 according to the third signal S3, and the processor unit U1 controls an output voltage value of the adjustable voltage boosting unit U4 according to the third signal S3. If the third signal S3 is smaller than the second preset value, the seventh switch K7 and the eighth switch K8 are turned off, and it is determined that the battery pack U5 does not output at this time, the controller unit U1 controls the adjustable voltage boosting unit U4 to output a preset voltage.
If the seventh switch K7 and the eighth switch K8 are already determined to be in a closed state in the previous step, at this time, the first switch K1 and the sixth switch K6 are closed, the first signal S1 and the second signal S2 are detected, a first voltage Vp and a second voltage Vn are calculated, the first voltage Vp is the voltage of the second end of the first switch K1, and the second voltage Vn is the voltage of the second end of the sixth switch K6, the voltage Vbat1 of the battery pack U5 is known to be Vp + Vn, and by comparing the values of Vbat0 and Vbat1, if the difference between the two values of Vbat0 and Vbat1 exceeds a third preset value, the detection circuit is considered to be in failure, subsequent operation is stopped, and alarm information is issued.
If the seventh switch K7 and the eighth switch K8 have been determined to be in an open state in the previous step, at this time, the first switch K1 and the sixth switch K6 are opened, the second switch K2 and the fifth switch K5 are closed, the first signal S1 and the second signal S2 are detected, Vp0 and Vn0 are calculated, Vp0 is the voltage of the second end of the first switch K1 at this time, Vn0 is the voltage of the second end of the sixth switch K6 at this time, if the difference between the value of Vp0+ Vn0 and the preset voltage output by the adjustable voltage boosting unit U4 is greater than a fourth preset value, the detection circuit is determined to transmit a fault, the subsequent operation is stopped and alarm information is issued, if the difference between Vp0 and Vn0 is greater than a fifth preset value, the detection circuit is determined to transmit a fault, the subsequent operation is stopped and alarm information is issued, and if the detection circuit is determined to transmit no fault, the voltage value Vhv of the output voltage of the adjustable voltage boost unit U4 is Vp0+ Vn 0.
If the seventh switch K7 and the eighth switch K8 are in an open state, the third switch K3, the fourth switch K4 and the sixth switch K6 are opened, and the first switch K1, the second switch K2 and the fifth switch K5 are closed, and at this time, the first signal S1 and the second signal S2 are detected, so that Vp1 and Vn1 can be calculated, and the following formulas are obtained:
the Vp1 is the voltage of the second terminal of the first switch K1, and the Vn1 is the voltage of the second terminal of the sixth switch K6.
Then, the first switch K1, the third switch K3 and the fourth switch K4 are opened, the second switch K2, the fifth switch K5 and the sixth switch K6 are closed, and at this time, the first signal S1 and the second signal S2 are detected, so that Vp2 and Vn2 can be calculated, and the following formulas are obtained:
the Rp and Rn can be calculated from the above formulas ① and ②.
When the seventh and eighth switches K7 and K8 have been judged to be in the closed state, the first and second voltages Vp and Vn are substituted into the following formulas:
then, the third switch K3, the fourth switch K4 and the sixth switch K6 are opened, and the first switch K1, the second switch K2 and the fifth switch K5 are closed, at this time, the first signal S1 and the second signal S2 are detected, so as to calculate Vp3, and Vp3 is the voltage of the second end of the first switch K1 at this time, and the following formula is obtained:
opening the first switch K1, the third switch K3 and the fourth switch K4, and closing the second switch K2, the fifth switch K5 and the sixth switch K6, detecting the first signal S1 and the second signal S2, calculating the voltage of the second end of the sixth switch K6 when Vn3 and Vn3 are the same, and obtaining the following formula:
the values of Rp and Rn may be calculated according to the equations ③, ④, and ⑤ above.
Wherein R in the above formulas is the resistance of the second resistor R2 and the third resistor R3, the resistance of the second resistor R2 is equal to the resistance of the third resistor R3, R0 in the above formulas is the resistance of the first resistor R1 and the fourth resistor R4, and the resistance of the first resistor R1 is equal to the resistance of the fourth resistor R4. The ground reference for the first voltage Vp and the second voltage Vn is the ground line PE, the ground reference for the battery pack U5 is the negative bus, and the ground reference for the controller unit U1 is connected to the negative bus.
The embodiment is provided with the adjustable boosting unit U4, high-voltage incoming line insulation detection can be introduced to the shell at the positive bus and the negative bus of the battery pack U5, even if the main switches (the seventh switch K7 and the eighth switch K8) of the battery system are not closed, the leakage condition of the battery system can be normally detected, and can send out warning information when the system is found to have abnormal sending fault, and the detection circuit can generate high voltage, when in detection, the detection is not influenced by the voltage of the battery pack U5, the universality and the flexibility of the detection are improved, when measuring, the detection circuit is introduced in a short time, the detection signal can be properly amplified, the detection precision and the anti-interference capability are improved, in addition, the detection circuit is provided with multiple switch combinations, so that the fault self-detection capability of the detection circuit is improved, the leakage current introduced by the detection circuit is reduced, and the detection precision is improved.
On the other hand, as shown in fig. 3, the present invention also provides a battery system insulation resistance detection method, applied to the battery system insulation resistance detection circuit, including:
step S1, acquiring the output voltage of the battery pack module;
step S2, acquiring a first overcurrent of the first insulation resistor Rp and the second insulation resistor Rn;
in step S3, resistance values of the first insulation resistance Rp and the second insulation resistance Rn are calculated from the output voltage and the first overcurrent.
In implementation, by obtaining the output voltage of the battery pack module and the first overcurrent passing through the first insulation resistor Rp and the second insulation resistor Rn, and by adjusting the parallel relationship between each resistor in the detection circuit module and the insulation resistors Rp and the second insulation resistor Rn for multiple times, the resistance values of the first insulation resistor Rp and the second insulation resistor Rn are calculated, and the detection accuracy is improved.
In an alternative embodiment, as shown in fig. 4, the step of calculating the resistance values of the first insulation resistance Rp and the second insulation resistance Rn according to the output voltage and the first overcurrent specifically includes:
step S31, acquiring internal voltage signals and internal current signals of a plurality of internal resistors connected in series in the detection circuit module, wherein the series body of the plurality of internal resistors is connected in parallel with the first insulation resistor Rp and the second insulation resistor Rn;
step S32, calculating the resistance values of the internal resistors according to the internal voltage signals and the internal current signals;
and step S33, calculating the resistance values of the first insulation resistance Rp and the second insulation resistance Rn according to a preset algorithm and the resistance values of a plurality of internal resistances.
In implementation, a plurality of parallel and/or series relations may be formed between the plurality of internal resistors in the detection circuit module and the first and second insulation resistors Rp and Rn, and the resistance values of the respective internal resistors may be calculated by changing the connection relations between the internal resistors and the first and second insulation resistors Rp and Rn and obtaining the internal voltage signals and the internal circuit signals of the internal resistors, and the resistance values between the first and second insulation resistors Rp and Rn may be calculated according to the connection relations between the plurality of internal resistors and the first and second insulation resistors Rp and Rn.
In an alternative embodiment, as shown in fig. 5, the step of obtaining the output voltage of the battery module is preceded by:
step S11, disconnecting the first connection terminal V1 and the second connection terminal V2 in the detection circuit module from the positive bus and the negative bus of the battery module;
and step S12, detecting whether the internal voltage of the detection circuit module is greater than a preset value, and if so, sending an alarm signal to external equipment.
In implementation, the detection circuit module includes a first connection end V1 and a second connection end V2, the first connection end V1 and the second connection end V2 are respectively connected to the positive bus and the negative bus, when the connection between the first connection end V1 and the connection between the second connection end V2 and the positive bus and the negative bus are disconnected, the battery pack module cannot provide voltage to the detection circuit module, at this time, the internal voltage of the detection circuit module is detected, if the internal voltage of the detection circuit module is detected to be greater than a preset value, it is considered that the detection circuit fails, and an alarm signal is sent to an external device, and the external device may be designed as a computer terminal, a display terminal or a mobile terminal, so that a user can conveniently detect whether the detection circuit fails at any time to perform maintenance management.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (4)
1. A battery system insulation resistance detection circuit characterized in that: the detection circuit module comprises a first connecting end V1 and a second connecting end V2, the first connecting end V1 is connected to a line between the first insulating resistor Rp and the positive bus, the second connecting end V2 is connected to a line between the second insulating resistor Rn and the negative bus, the first insulating resistor Rp is an equivalent resistance of a leakage resistor connected between the positive bus and the ground of the battery pack module, the second insulation resistor Rn is an equivalent resistor of a leakage resistor connected between a negative bus of the battery module and the ground line PE;
the detection circuit module comprises a processor unit, a first signal processing unit, a second signal processing unit and an adjustable boosting unit, wherein a first connection end V1 is connected to a first end of a first switch K1, a second end of the first switch K1 is connected to a first end of a second switch K2, a second end of the second switch K2 is connected to an output end hv of the adjustable boosting unit, the output end hv is further connected to a second end of a third switch K3, a second end of a fourth switch K4 and a second end of a fifth switch K5 respectively, a first end of the fifth switch K5 is connected to a second end of a sixth switch K6, a first end of the sixth switch K6 is connected to the second connection end V2, a first end of the third switch K3 and a first end of a fourth switch K4 are both connected to the ground wire PE, and a second end of the first switch K1 is further connected to a first resistor R1, a second resistor R2 and an adjustable boosting unit in sequence, A third resistor R3 and a fourth resistor R4 are connected to a first end of the fifth switch K5, an input end of the first signal processing unit is connected to a line between the first resistor R1 and the second resistor R2, an input end of the second signal processing unit is connected to a line between the third resistor R3 and the fourth resistor R4, the processor unit is connected with an output end of the first signal processing unit and an output end of the second signal processing unit, an input end of the adjustable boosting unit is connected to an output end of the processor unit, a first end of the third switch K3 and a first end of the fourth switch K4 are both connected to a line between the second resistor R2 and the third resistor R3, a first end of the third switch K3 and a first end of the fourth switch K4 are also connected to a ground line, and the first switch K1, the second switch K2, the third switch K3, the fourth switch K4 and the fifth switch K1 are also connected to a ground line, The signal terminals of the fourth switch K4, the fifth switch K5, and the sixth switch K6 are connected to the processor unit.
2. The battery system insulation resistance detection circuit according to claim 1, characterized in that: the detection circuit module further comprises a fifth resistor R5 and a sixth resistor R6, one end of the fifth resistor R5 is connected to the first connection end V1, the other end of the fifth resistor R5 is connected to the second connection end V2 through the sixth resistor R6, and the other end of the fifth resistor R5 is further connected to the processor unit.
3. The battery system insulation resistance detection circuit according to claim 1, characterized in that: the battery module includes a battery pack, a positive electrode of which is connected to the positive bus bar through a seventh switch K7, and a negative electrode of which is connected to the negative bus bar through an eighth switch K8.
4. The battery system insulation resistance detection circuit according to claim 1 or 3, characterized in that: the battery module further includes a load through which the positive bus bar is connected to the negative bus bar.
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| CN109633462B (en) * | 2018-12-29 | 2021-04-20 | 蜂巢能源科技有限公司 | Battery voltage state detection method and detection system in battery management system and battery management system |
| CN110174621A (en) * | 2019-05-31 | 2019-08-27 | 欣旺达电子股份有限公司 | Automobile batteries delivery test system and method |
| CN113311233A (en) * | 2021-05-25 | 2021-08-27 | 深圳市吉利通电子有限公司 | Insulation resistance detection method and system |
| CN113777514B (en) * | 2021-09-24 | 2023-06-16 | 重庆电哥科技(集团)有限公司 | Insulation detection circuit, system and method of back-up energy storage system |
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| CN108646187A (en) | 2018-10-12 |
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Effective date of registration: 20210520 Address after: 321100 No.16 Hongyun Road, Lanjiang street, Lanxi City, Jinhua City, Zhejiang Province (self declaration) Patentee after: Zhejiang Xindong Energy Technology Co.,Ltd. Address before: 518000, 1st floor, 2nd floor, A-B area, 2nd floor, D area-9th floor, Yihe Road, Shiyan Street, Baoan District, Shenzhen City, Guangdong Province Patentee before: SUNWODA ELECTRONICS Co.,Ltd. |