CN220904702U - Battery insulation monitoring circuit and electric equipment - Google Patents

Abstract

The present disclosure relates to the field of vehicles, and in particular, to a battery insulation monitoring circuit and an electric device. The battery insulation monitoring circuit includes: the device comprises a power module, a first insulation branch, a second insulation branch, a third insulation branch, a fourth insulation branch and an insulation monitoring device; the power module comprises a first battery pack, a voltage division contactor and a second battery pack which are connected in series; the insulation monitoring device is connected with the first end of the first insulation branch, the first end of the second insulation branch, the first end of the third insulation branch and the first end of the fourth insulation branch; the second end of the first insulating branch is connected with the positive electrode of the first battery pack, the second end of the second insulating branch is connected with the first end of the voltage dividing contactor, the second end of the third insulating branch is connected with the second end of the voltage dividing contactor, and the second end of the fourth insulating branch is connected with the negative electrode of the second battery pack. Therefore, the insulation conditions of different battery packs in the power supply module can be detected in groups, and the use safety of the power supply module is improved.

Description

Battery insulation monitoring circuits and electric equipment

Technical Field

The present disclosure relates to the field of vehicles, and in particular, to a battery insulation monitoring circuit and an electric device.

Background technique

The insulation monitoring system needs to detect the insulation resistance from the positive and negative circuits to the vehicle body ground. Existing insulation monitoring system solutions are often connected to the positive and negative lead-out terminals of the high-voltage battery pack. The insulation condition of the vehicle end can only be detected when the high-voltage circuit of the vehicle is turned on.

At present, some battery systems are equipped with voltage divider contactors between battery packs to ensure safety. However, when the voltage divider contactors are disconnected, the insulation condition of the batteries cannot be detected, posing a risk of electric shock.

Utility Model Content

The purpose of the present disclosure is to provide a battery insulation monitoring circuit and an electric device to perform group detection on the insulation conditions of different battery groups in a power module, thereby improving the safety of the power module.

In order to achieve the above-mentioned object, the first aspect of the present disclosure provides a battery insulation monitoring circuit, comprising: a power module, a first insulation branch, a second insulation branch, a third insulation branch, a fourth insulation branch and an insulation monitoring device;

The power module comprises a first battery group, a voltage divider contactor and a second battery group connected in series; the negative electrode of the first battery group is connected to the first end of the voltage divider contactor, and the positive electrode of the second battery group is connected to the second end of the voltage divider contactor;

The insulation monitoring device is simultaneously connected to the first end of the first insulating branch, the first end of the second insulating branch, the first end of the third insulating branch and the first end of the fourth insulating branch;

The second end of the first insulating branch is connected to the positive electrode of the first battery pack, the second end of the second insulating branch is connected to the first end of the voltage divider contactor, the second end of the third insulating branch is connected to the second end of the voltage divider contactor, and the second end of the fourth insulating branch is connected to the negative electrode of the second battery pack;

The monitoring circuit is suitable for being configured as follows: if the voltage-dividing contactor is disconnected, the third insulating branch and the fourth insulating branch are placed in an open-circuit state, and the first insulating branch and the second insulating branch are placed in a conductive state, so that the insulation monitoring device performs insulation detection on the first battery group; or, the first insulating branch and the second insulating branch are placed in an open-circuit state, and the third insulating branch and the fourth insulating branch are placed in a conductive state, so that the insulation monitoring device performs insulation detection on the second battery group.

Optionally, the monitoring circuit is suitable for being configured as follows: if the voltage divider contactor is turned on, the second insulating branch and the third insulating branch are placed in an open circuit state, and the first insulating branch and the fourth insulating branch are placed in a conducting state, so that the insulation monitoring device performs insulation detection on the power module.

Optionally, the battery insulation monitoring circuit further includes a first switch state controller,

The first switch state controller is control-connected to the first insulating branch, the second insulating branch, the third insulating branch and the fourth insulating branch, and is used to control the opening and closing of each insulating branch.

Optionally, the first insulating branch includes a first switch, the second insulating branch includes a second switch, the third insulating branch includes a third switch, and the fourth insulating branch includes a fourth switch.

Optionally, the battery insulation monitoring circuit further includes a load and a main positive contactor,

The positive electrode of the first battery pack is connected to the first end of the load through the main positive contactor; the positive electrode of the first battery pack is connected to the second end of the load.

Optionally, the battery insulation monitoring circuit further includes a second switch state controller;

The second switch state controller is connected to the voltage-dividing contactor and the main positive contactor, and is used to control the opening and closing of the voltage-dividing contactor and the main positive contactor.

Optionally, the battery insulation monitoring circuit further includes a main negative contactor,

The negative electrode of the second battery pack is connected to the second end of the load through the main negative contactor;

The second switch state controller is also connected to the main negative contactor and is used to control the opening and closing of the main negative contactor.

Optionally, the maximum voltage between the second end of the voltage-dividing contactor and the negative electrode of the second battery pack is less than a preset safety voltage threshold, and there is no main negative contactor between the second end of the load and the negative electrode of the second battery pack.

Optionally, the battery insulation monitoring circuit further includes a fault category determination controller for determining a fault category of the power module, and the fault category determination controller is connected to the second switch state controller and the power module;

The second switch state controller is suitable for being configured to: when a first type of preset fault occurs in the power module, disconnect the voltage-dividing contactor and the main positive contactor in sequence.

Optionally, the fault type determination controller includes a detection component for performing status detection on the power module;

The second switch state controller is suitable for being configured to: when a second type of preset fault occurs in the power module, disconnect the main positive contactor and keep the voltage dividing contactor turned on, so that the detection component performs state detection on the power module.

Optionally, each battery pack includes a plurality of sub-battery packs connected in series and sub-contactors connected between adjacent sub-battery packs;

The second switch state controller is connected to each of the sub-contactors and is used to control the opening and closing of the sub-contactors.

A second aspect of the present disclosure provides an electric device, comprising:

A battery insulation monitoring circuit, wherein the battery insulation monitoring circuit is the battery insulation monitoring circuit provided in the first aspect of the present disclosure.

Optionally, the electric device further comprises:

The information prompting unit is connected to the insulation monitoring device and is used to provide a prompt when there is an abnormality in the insulation of the battery pack.

In the above technical solution, the power module includes a first battery group, a voltage divider contactor and a second battery group connected in series. By setting the voltage divider contactor, the batteries of the power module can be grouped and processed, and the on and off of the high-voltage circuit can be controlled. The insulation monitoring device is simultaneously connected to the first end of the first insulating branch, the first end of the second insulating branch, the first end of the third insulating branch and the first end of the fourth insulating branch; the second end of the first insulating branch is connected to the positive electrode of the first battery group, the second end of the second insulating branch is connected to the first end of the voltage divider contactor, the second end of the third insulating branch is connected to the second end of the voltage divider contactor, and the second end of the fourth insulating branch is connected to the negative electrode of the second battery group. In this way, when the voltage divider contactor is disconnected, the third insulating branch and the fourth insulating branch can be controlled to be in an open circuit state, and the first insulating branch and the second insulating branch can be in a conducting state, so as to perform insulation detection on the first battery group, or the first insulating branch and the second insulating branch can be controlled to be in an open circuit state, and the third insulating branch and the fourth insulating branch can be controlled to be in a conducting state, so as to perform insulation detection on the second battery group. That is, through the battery insulation monitoring circuit provided by the present invention, when the voltage-dividing contactor is disconnected and the high-voltage circuit is not conducting, the insulation conditions of different battery groups in the power module can be grouped and detected to improve the safety of the power module.

Other features and advantages of the present disclosure will be described in detail in the following detailed description.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

FIG. 1 is a block diagram of a battery insulation monitoring circuit provided by an exemplary embodiment of the present disclosure.

FIG. 2 is a schematic diagram of a battery insulation monitoring circuit provided by an exemplary embodiment of the present disclosure.

FIG. 3 is a schematic diagram of a battery insulation monitoring circuit provided by an exemplary embodiment of the present disclosure.

FIG. 4 is a schematic diagram of a battery insulation monitoring circuit provided by an exemplary embodiment of the present disclosure.

FIG. 5 is a schematic diagram of a battery insulation monitoring circuit provided by an exemplary embodiment of the present disclosure.

FIG. 6 is a schematic diagram of a battery insulation monitoring circuit provided by an exemplary embodiment of the present disclosure.

FIG. 7 is a schematic diagram of a battery insulation monitoring circuit provided by an exemplary embodiment of the present disclosure.

Description of Reference Numerals

10. Power module; 11. First battery pack; 12. Second battery pack; 21. First insulation branch; 22. Second insulation branch; 23. Third insulation branch; 24. Fourth insulation branch; 31. Insulation monitoring device; 41. First switch state controller; 42. Second switch state controller; 43. Fault type judgment controller; 51. Load;

K1, first switch; K2, second switch; K3, third switch; K4, fourth switch; KM1, voltage divider contactor; KM2, main positive contactor; KM3, main negative contactor; R11+, first equivalent insulation resistance; R11-, second equivalent insulation resistance; R21+, third equivalent insulation resistance; R21-, fourth equivalent insulation resistance; R1+, fifth equivalent insulation resistance; R1-, sixth equivalent insulation resistance.

Detailed ways

The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

Fig. 1 is a block diagram of a battery insulation monitoring circuit provided by an exemplary embodiment of the present disclosure. As shown in Fig. 1, the battery insulation monitoring circuit includes a power module 10, a first insulation branch 21, a second insulation branch 22, a third insulation branch 23, a fourth insulation branch 24 and an insulation monitoring device 31.

The power module 10 includes a first battery group 11, a voltage divider contactor KM1, and a second battery group 12 connected in series; the negative electrode of the first battery group 11 is connected to the first end of the voltage divider contactor KM1, and the positive electrode of the second battery group 12 is connected to the second end of the voltage divider contactor KM1;

The insulation monitoring device 31 is simultaneously connected to the first end of the first insulating branch 21, the first end of the second insulating branch 22, the first end of the third insulating branch 23 and the first end of the fourth insulating branch 24;

The second end of the first insulating branch 21 is connected to the positive electrode of the first battery group 11, the second end of the second insulating branch 22 is connected to the first end of the voltage divider contactor KM1, the second end of the third insulating branch 23 is connected to the second end of the voltage divider contactor KM1, and the second end of the fourth insulating branch 24 is connected to the negative electrode of the second battery group 12.

The power module 10 may include a plurality of single-cell batteries, which can supply power to the load 51 when connected in series. A voltage divider contactor KM1 may be added between two adjacent single-cell batteries to divide the plurality of single-cell batteries into a first battery group 11 and a second battery group 12.

In the plan view shown in FIG1 , the first end of the voltage divider contactor KM1 is the upper end of the voltage divider contactor KM1, and the second end of the voltage divider contactor KM1 is the lower end of the voltage divider contactor KM1; the first end of the first insulating branch 21 is the lower end of the first insulating branch 21, connected to the insulation monitoring device 31, and the second end of the first insulating branch 21 is the upper end of the first insulating branch 21, connected to the positive electrode of the first battery pack 11; the first end of the second insulating branch 22 is the right end of the second insulating branch 22, connected to the insulation monitoring device 31, and the second end of the second insulating branch 22 is the right end of the second insulating branch 22. The first end of the third insulating branch 23 is the right end of the third insulating branch 23, connected to the insulation monitoring device 31, and the second end of the third insulating branch 23 is the left end of the third insulating branch 23, connected to the second end of the voltage dividing contactor KM1; the first end of the fourth insulating branch 24 is the upper end of the fourth insulating branch 24, connected to the insulation monitoring device 31, and the second end of the fourth insulating branch 24 is the lower end of the fourth insulating branch 24, connected to the negative electrode of the second battery group 12. The insulation monitoring device 31 is grounded.

As shown in Fig. 2, the first insulating branch 21 may include a first switch K1, the second insulating branch 22 may include a second switch K2, the third insulating branch 23 may include a third switch K3, and the fourth insulating branch 24 may include a fourth switch K4. Each insulating branch may also include other switch structures such as MOS tubes (metal oxide semiconductor field effect transistors) to achieve control of the conduction and disconnection of each insulating branch.

The monitoring circuit is suitable for being configured as follows: if the voltage-dividing contactor KM1 is disconnected, the third insulating branch 23 and the fourth insulating branch 24 are in an open-circuit state, and the first insulating branch 21 and the second insulating branch 22 are in a conducting state, so that the insulation monitoring device 31 performs insulation detection on the first battery group 11; or, the first insulating branch 21 and the second insulating branch 22 are in an open-circuit state, and the third insulating branch 23 and the fourth insulating branch 24 are in a conducting state, so that the insulation monitoring device 31 performs insulation detection on the second battery group 12.

For example, if the voltage divider contactor KM1 is disconnected, the third insulating branch 23 and the fourth insulating branch 24 are disconnected, and the first insulating branch 21 and the second insulating branch 22 are turned on, taking the on and off of each insulating branch controlled by the corresponding switch as an example, an equivalent circuit as shown in FIG3 can be obtained. The first equivalent insulation resistance R11+ in FIG3 is the equivalent insulation resistance of the positive pole of the first battery pack 11 to the ground when the voltage divider contactor KM1 is disconnected, and the second equivalent insulation resistance R11- is the equivalent insulation resistance of the negative pole of the first battery pack 11 to the ground when the voltage divider contactor KM1 is disconnected. By controlling the first switch K1 and the second switch K2 to close, and controlling the third switch K3, the fourth switch K4, and the voltage divider contactor KM1 to be disconnected, a circuit for detecting the insulation condition of the first battery pack 11 can be formed to detect the insulation condition of the first battery pack 11 through the insulation monitoring device 31. It is worth noting that the equivalent resistance involved in the present disclosure is not a resistance element actually existing in the circuit.

For example, if the voltage divider contactor KM1 is disconnected, the first insulating branch 21 and the second insulating branch 22 are disconnected, and the third insulating branch 23 and the fourth insulating branch 24 are connected, taking the on and off of each insulating branch controlled by the corresponding switch as an example, an equivalent circuit as shown in FIG4 can be obtained. The third equivalent insulation resistance R21+ in FIG4 is the equivalent insulation resistance of the positive pole of the second battery pack 12 to the ground when the voltage divider contactor KM1 is disconnected, and the fourth equivalent insulation resistance R21- is the equivalent insulation resistance of the negative pole of the second battery pack 12 to the ground when the voltage divider contactor KM1 is disconnected. By controlling the third switch K3 and the fourth switch K4 to close, and controlling the first switch K1, the second switch K2, and the voltage divider contactor KM1 to be disconnected, a circuit for detecting the insulation condition of the second battery pack 12 can be formed, so as to detect the insulation condition of the second battery pack 12 through the insulation monitoring device 31.

The voltage-dividing contactor KM1 being disconnected may refer to the voltage-dividing contactor KM1 being continuously in an disconnected state, or being converted from an on state to an off state.

In the above technical solution, the power module 10 includes a first battery group 11, a voltage divider contactor KM1 and a second battery group 12 connected in series. By setting the voltage divider contactor KM1, the batteries of the power module 10 can be grouped and processed, and the on and off of the high-voltage circuit can be controlled. The insulation monitoring device 31 is simultaneously connected to the first end of the first insulating branch 21, the first end of the second insulating branch 22, the first end of the third insulating branch 23 and the first end of the fourth insulating branch 24; the second end of the first insulating branch 21 is connected to the positive electrode of the first battery group 11, the second end of the second insulating branch 22 is connected to the first end of the voltage divider contactor KM1, the second end of the third insulating branch 23 is connected to the second end of the voltage divider contactor KM1, and the second end of the fourth insulating branch 24 is connected to the negative electrode of the second battery group 12. In this way, when the voltage-dividing contactor KM1 is disconnected, the third insulating branch 23 and the fourth insulating branch 24 can be controlled to be in an open circuit state, and the first insulating branch 21 and the second insulating branch 22 can be controlled to be in a conducting state, so as to perform insulation detection on the first battery pack 11, or the first insulating branch 21 and the second insulating branch 22 can be controlled to be in an open circuit state, and the third insulating branch 23 and the fourth insulating branch 24 can be controlled to be in a conducting state, so as to perform insulation detection on the second battery pack 12. That is, through the battery insulation monitoring circuit provided by the present disclosure, when the voltage-dividing contactor KM1 is disconnected and the high-voltage circuit is not conducting, the insulation conditions of different battery packs in the power module 10 can be grouped and detected, so as to improve the safety of the use of the power module 10.

In an optional embodiment, the monitoring circuit is also suitable for being configured as follows: if the voltage-dividing contactor KM1 is turned on, the second insulating branch 22 and the third insulating branch 23 are in an open-circuit state, and the first insulating branch 21 and the fourth insulating branch 24 are in a turned-on state, so that the insulation monitoring device 31 performs insulation detection on the power module 10.

For example, if the voltage divider contactor KM1 is closed, the second insulating branch 22 and the third insulating branch 23 are disconnected, and the first insulating branch 21 and the fourth insulating branch 24 are connected, taking the on and off of each insulating branch controlled by the corresponding switch as an example, an equivalent circuit as shown in FIG5 can be obtained. The fifth equivalent insulation resistance R1+ in FIG5 is the equivalent insulation resistance of the positive pole of the power module 10 to the ground when the voltage divider contactor KM1 is closed, and the sixth equivalent insulation resistance R1- is the equivalent insulation resistance of the negative pole of the power module 10 to the ground when the voltage divider contactor KM1 is closed. By controlling the first switch K1 and the fourth switch K4 to be closed, and controlling the third switch K3, the second switch K2, and the voltage divider contactor KM1 to be closed, a circuit for detecting the insulation condition of the power module 10 can be formed, that is, a circuit that can be used to detect the insulation condition of the first battery group 11 and the second battery group 12 connected in series as a whole, so as to detect the insulation condition of the power module 10 through the insulation monitoring device 31.

As shown in FIG. 2 , in an optional embodiment, the battery insulation monitoring circuit further includes a first switch state controller 41,

The first switch state controller 41 is control-connected to the first insulating branch 21 , the second insulating branch 22 , the third insulating branch 23 and the fourth insulating branch 24 , and is used to control the opening and closing of each insulating branch.

As described above, the first insulating branch 21 may include a first switch K1, the second insulating branch 22 may include a second switch K2, the third insulating branch 23 may include a third switch K3, and the fourth insulating branch 24 may include a fourth switch K4. The first switch state controller 41 may control the opening and closing of each switch.

In an optional embodiment, the battery insulation monitoring circuit further includes a load 51 and a main positive contactor KM2.

The positive electrode of the first battery pack 11 is connected to the first end of the load 51 through the main positive contactor KM2; the positive electrode of the first battery pack 11 is connected to the second end of the load 51;

The battery insulation monitoring circuit further includes a second switch state controller 42;

The second switch state controller 42 is connected to the voltage dividing contactor KM1 and the main positive contactor KM2 and is used to control the opening and closing of the voltage dividing contactor KM1 and the main positive contactor KM2.

If the line between the power module 10 and the load 51 is conductive, the first switch K1 and the fourth switch K4 are controlled to be closed, and the third switch K3, the second switch K2, and the voltage divider contactor KM1 are controlled to be closed, and the insulation monitoring device 31 can detect the insulation status of the first battery group 11, the second battery group 12, and the load 51 after the power module 10 is connected in series. If the line between the power module 10 and the load 51 is not conductive, the first switch K1 and the fourth switch K4 are controlled to be closed, and the third switch K3, the second switch K2, and the voltage divider contactor KM1 are controlled to be closed, and the insulation monitoring device 31 can detect the insulation status of the first battery group 11 and the second battery group 12 after the power module 10 is connected in series. In the plan view shown in FIG6, the first end of the load 51 is the upper end, and the second end of the load 51 is the lower end. Among them, the first switch state controller 41 and the second switch state controller 42 can be integrated into one switch state controller.

Optionally, the battery insulation monitoring circuit may further include a main negative contactor KM3,

The negative electrode of the second battery pack 12 is connected to the second end of the load 51 through the main negative contactor KM3;

The second switch state controller 42 is also connected to the main negative contactor KM3 and is used to control the opening and closing of the main negative contactor KM3.

As shown in FIG6 , the second switch state controller 42 can control the opening and closing of the voltage divider contactor KM1 , the main positive contactor KM2 and the main negative contactor KM3 connected thereto, so that the power module 10 can supply power to the load 51 and control the on and off of the high-voltage circuit where the load 51 is located.

Optionally, the maximum voltage between the second end of the voltage-dividing contactor KM1 and the negative electrode of the second battery pack 12 is less than a preset safety voltage threshold, and there is no main negative contactor KM3 between the second end of the load 51 and the negative electrode of the second battery pack 12 .

For example, the specific location of the voltage divider contactor KM1 can be determined based on a preset voltage threshold, wherein the voltage threshold can be set based on a safety standard, for example, can be set to 60 V. Since the voltage that the second battery pack 12 can provide is relatively low, even if the main negative contactor KM3 is cancelled, the safety of the power module 10 can still be ensured. At this time, in order to simplify the circuit, the main negative contactor KM3 can be cancelled.

Optionally, as shown in FIG. 7 , the battery insulation monitoring circuit may further include a fault category determination controller 43 for determining the fault category of the power module 10 , and the fault category determination controller 43 is connected to the second switch state controller 42 and the power module 10 ;

The second switch state controller 42 is adapted to be configured to, when a first type of preset fault occurs in the power module 10 , disconnect the voltage dividing contactor KM1 and the main positive contactor KM2 in sequence.

For example, the fault category judgment controller 43 can judge the fault level, that is, the fault category, based on the fault information of the power module 10. The fault of the power module 10 can be divided into a first type of preset fault that characterizes a serious fault, and a second type of preset fault that characterizes a general fault. For example, the first type of preset fault may include serious faults such as thermal runaway, collision, severe overvoltage, severe overtemperature, and overdischarge. The second type of preset fault may include general faults such as general overtemperature, general overdischarge, general overvoltage, and insulation fault (the insulation fault here refers to the abnormal insulation result of the power module 10 and the load 51 as a whole before the high-voltage circuit is disconnected). When the first type of preset fault occurs in the power module 10, the second switch state controller 42 can control the voltage divider contactor KM1 to disconnect first to ensure that the high-voltage circuit is disconnected, and then control the main positive contactor KM2 to disconnect. In this way, when the fault of the power module 10 is more serious, even if the main positive contactor KM2 has a sticking problem when disconnecting, the high-voltage circuit can be disconnected by first cutting off the voltage divider contactor KM1; when a serious fault occurs in some battery packs, the voltage divider contactor KM1 is disconnected in time to minimize the risk of fault spread.

Optionally, the fault type determination controller 43 includes a detection component for performing status detection on the power module 10;

The second switch state controller 42 is suitable for being configured to: when a second type of preset fault occurs in the power module 10 , disconnect the main positive contactor KM2 and keep the voltage dividing contactor KM1 turned on, so that the detection component performs state detection on the power module 10 .

For example, when the second type of preset fault occurs in the power module 10, the second switch state controller 42 can first disconnect the main positive contactor KM2 and keep the voltage divider contactor KM1 turned on. At this time, the detection component can detect the temperature, voltage, and SOC (State of Charge) of each battery in the power module 10, and can also detect the balance state between each battery. After the detection component completes the state detection of the power module 10, the voltage divider contactor KM1 can be controlled to disconnect. In this way, the state of the power module 10 can be detected before the voltage divider contactor KM1 is disconnected to obtain the latest state data of the power module 10, which is convenient for subsequent query use.

In an optional embodiment, each battery group may include a plurality of sub-battery groups connected in series and sub-contactors connected between adjacent sub-battery groups;

The second switch state controller 42 is connected to each sub-contactor and is used to control the opening and closing of the sub-contactor.

For example, the first battery pack 11 may include a first sub-battery pack, a first sub-contactor, a second sub-battery pack, a second sub-contactor, and a third sub-battery pack connected in series in sequence. In this way, when it is determined that the power module 10 is faulty, the second switch state controller 42 can control the voltage divider contactor KM1 and each sub-contactor in the power module 10 to disconnect. By setting up multiple sub-contactors, the risk of arcing between adjacent cells caused by thermal runaway of a single battery cell can be further reduced, and the risk of high-voltage electric shock caused by impact on electric equipment can also be further reduced, so as to further improve the safety of the power module 10.

In addition, each sub-battery group can be individually connected in series with the insulation monitoring device 31, and corresponding switches are respectively set on the two lines connecting the sub-battery group and the insulation monitoring device 31 to achieve individual detection of the insulation state of each sub-battery group.

The present disclosure also provides an electric device, which includes a battery insulation monitoring circuit, and the battery insulation monitoring circuit is the battery insulation monitoring circuit described in any of the above embodiments.

In an optional embodiment, the electric device may further include an information prompting unit connected to the insulation monitoring device 31 for providing a prompt when an abnormality occurs in the insulation of the battery pack.

The information prompting unit may include at least one of a vehicle-mounted display screen and a speaker.

For example, when the insulation monitoring device 31 determines that there is an insulation fault, it can generate corresponding prompt information based on the specific insulation fault location. The insulation monitoring device 31 can send the prompt information to the vehicle display screen to display the prompt information through the vehicle display screen. The prompt information can also be sent to a speaker to broadcast the prompt information through the speaker. In this way, the user can promptly understand the specific location of the insulation fault, remind the user to perform repairs in time, and thus improve the user's experience.

The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims (13)

1. The battery insulation monitoring circuit is characterized by comprising a power supply module (10), a first insulation branch circuit (21), a second insulation branch circuit (22), a third insulation branch circuit (23), a fourth insulation branch circuit (24) and an insulation monitoring device (31);

The power module (10) comprises a first battery pack (11), a voltage division contactor (KM 1) and a second battery pack (12) which are connected in series; the negative electrode of the first battery pack (11) is connected with the first end of the partial pressure contactor (KM 1), and the positive electrode of the second battery pack (12) is connected with the second end of the partial pressure contactor (KM 1);

The insulation monitoring device (31) is connected with the first end of the first insulation branch (21), the first end of the second insulation branch (22), the first end of the third insulation branch (23) and the first end of the fourth insulation branch (24) at the same time;

The second end of the first insulation branch (21) is connected with the positive electrode of the first battery pack (11), the second end of the second insulation branch (22) is connected with the first end of the voltage division contactor (KM 1), the second end of the third insulation branch (23) is connected with the second end of the voltage division contactor (KM 1), and the second end of the fourth insulation branch (24) is connected with the negative electrode of the second battery pack (12);

the monitoring circuit is suitably configured to: if the voltage division contactor (KM 1) is disconnected, the third insulation branch (23) and the fourth insulation branch (24) are in an open circuit state, and the first insulation branch (21) and the second insulation branch (22) are in a conducting state, so that the insulation monitoring device (31) performs insulation detection on the first battery pack (11); or, the first insulation branch (21) and the second insulation branch (22) are in an open state, and the third insulation branch (23) and the fourth insulation branch (24) are in a conducting state, so that the insulation monitoring device (31) performs insulation detection on the second battery pack (12).

2. The battery insulation monitoring circuit of claim 1, wherein the monitoring circuit is adapted to be configured to: if the voltage division contactor (KM 1) is conducted, the second insulation branch (22) and the third insulation branch (23) are in an open circuit state, and the first insulation branch (21) and the fourth insulation branch (24) are in a conducting state, so that the insulation monitoring device (31) performs insulation detection on the power module (10).

3. The battery insulation monitoring circuit according to claim 2, further comprising a first switch state controller (41),

The first switch state controller (41) is in control connection with the first insulation branch (21), the second insulation branch (22), the third insulation branch (23) and the fourth insulation branch (24) and is used for controlling the opening and closing of each insulation branch.

4. A battery insulation monitoring circuit according to claim 3, characterized in that the first insulation branch (21) comprises a first switch (K1), the second insulation branch (22) comprises a second switch (K2), the third insulation branch (23) comprises a third switch (K3), and the fourth insulation branch (24) comprises a fourth switch (K4).

5. The battery insulation monitoring circuit according to claim 1, further comprising a load (51) and a main positive contact (KM 2),

The positive electrode of the first battery pack (11) is connected with the first end of a load (51) through the main positive contactor (KM 2); the positive electrode of the first battery pack (11) is connected to the second end of the load (51).

6. The battery insulation monitoring circuit of claim 5, further comprising a second switch state controller (42);

The second switch state controller (42) is connected with the partial pressure contactor (KM 1) and the main positive contactor (KM 2) and is used for controlling the opening and closing of the partial pressure contactor (KM 1) and the main positive contactor (KM 2).

7. The battery insulation monitoring circuit according to claim 6, further comprising a main negative contactor (KM 3),

The negative electrode of the second battery pack (12) is connected with the second end of the load (51) through the main negative contactor (KM 3);

The second switch state controller (42) is also connected with the main negative contactor (KM 3) and is used for controlling the opening and closing of the main negative contactor (KM 3).

8. The battery insulation monitoring circuit according to claim 6, characterized in that the maximum voltage between the second end of the voltage dividing contactor (KM 1) and the negative pole of the second battery (12) is less than a preset safety voltage threshold, and that there is no main negative contactor (KM 3) between the second end of the load (51) and the negative pole of the second battery (12).

9. The battery insulation monitoring circuit according to claim 6, further comprising a fault class determination controller (43) for determining a fault class of the power module (10), the fault class determination controller (43) being connected with the second switch state controller (42), the power module (10);

The second switch state controller (42) is adapted to be configured to: when a first type of preset faults occur to the power supply module (10), the voltage dividing contactor (KM 1) and the main positive contactor (KM 2) are sequentially disconnected.

10. The battery insulation monitoring circuit according to claim 9, wherein the fault class judgment controller (43) includes a detection component for performing state detection of the power supply module (10);

The second switch state controller (42) is adapted to be configured to: when the second type of preset faults occur to the power module (10), the main positive contactor (KM 2) is disconnected, and the partial pressure contactor (KM 1) is kept on, so that the detection assembly detects the state of the power module (10).

11. The battery insulation monitoring circuit of claim 6, wherein,

Each battery pack comprises a plurality of sub-battery packs connected in series and sub-contactors connected between adjacent sub-battery packs;

the second switch state controller (42) is connected with each sub-contactor and is used for controlling the opening and closing of the sub-contactor.

12. An electrically powered device, the electrically powered device comprising:

A battery insulation monitoring circuit as defined in any one of claims 1 to 11.

13. The electrically powered device of claim 12, further comprising:

and an information presentation unit connected to the insulation monitoring device (31) for presenting the battery pack when the insulation of the battery pack is abnormal.