CN220291869U - Driving circuit, battery management system and vehicle - Google Patents

Abstract

The utility model discloses a driving circuit, a battery management system and a vehicle. The driving circuit is applied to the battery management system and comprises an enabling module, an output module, a load module and a protection module, wherein the control end of the enabling module is connected with the output port of the controller of the battery management system; the control end of the output module is connected with the first end of the enabling module, the first end of the output module is connected with the first power supply, and the output module is configured to output a driving signal to external equipment when receiving the enabling signal; the protection module is connected between the first power supply and the first end of the output module, and/or the first end of the protection module is connected with the first power supply, and the second end of the protection module is connected with the control end of the output module; the protection module is configured to limit the output current value output to the external device by the output module to be smaller than or equal to a preset current value. The technical scheme of the embodiment reduces the energy consumption and the cost while protecting the driving circuit.

Description

Driving circuit, battery management system and vehicle

Technical Field

The present utility model relates to the field of driving circuits, and more particularly, to a driving circuit, a battery management system, and a vehicle.

Background

With the rapid development of vehicle technology, the control demands of the battery management system of the battery pack are increasing.

Current battery management systems require low current high side signal interfaces for high voltage interlock signals, auto code signals, fan control signals, etc., which are not high in output current capability, typically within 10 milliamps.

The battery management system of the high-voltage platform is applied to commercial vehicles and passenger vehicles in many cases, and has abusive test requirements on ground short circuits of connector terminals of vehicle body parts, so that integrated high-side drive with overcurrent protection can be used in the traditional design. The output current of the integrated high-side drive with protection is higher, usually more than 1A, the design margin is overlarge, and the cost is higher.

Disclosure of Invention

The utility model provides a driving circuit, a battery management system and a vehicle, so that the cost is reduced while the driving circuit is protected.

According to an aspect of the present utility model, there is provided a driving circuit applied to a battery management system, the driving circuit including:

the control end of the enabling module is connected with the output port of the controller of the battery management system, and the enabling module is configured to output an enabling signal when receiving a first level signal output by the controller;

the control end of the output module is connected with the first end of the enabling module, the first end of the output module is connected with a first power supply, and the output module is configured to output a driving signal to external equipment when receiving the enabling signal;

the load module is connected with the second end of the output module;

the protection module is connected between the first power supply and the first end of the output module, and/or the first end of the protection module is connected with the first power supply, and the second end of the protection module is connected with the control end of the output module; the protection module is configured to limit the output current value output to the external device by the output module to be smaller than or equal to a preset current value.

Optionally, the output module includes a first transistor, a first resistor, and a second resistor;

the first end of the first resistor is electrically connected with the first power supply;

the control electrode of the first transistor is connected with the first end of the enabling module, the first electrode of the first transistor is electrically connected with the second end of the first resistor, and the second electrode of the first transistor is electrically connected with the load module;

a first end of the second resistor is electrically connected with the first power supply, and a second end of the second resistor is electrically connected with a control electrode of the first transistor;

the protection module is connected between the first power supply and the first end of the first resistor, and/or the first end of the protection module is electrically connected with the first power supply, and the second end of the protection module is electrically connected with the control electrode of the first transistor.

Optionally, when the first end of the protection module is connected with the first power supply and the second end of the protection module is connected with the control end of the output module, the protection module comprises a clamping diode and a second transistor;

a first pole of the clamping diode is electrically connected with the first power supply;

the control electrode of the second transistor is electrically connected with the control electrode of the first transistor, the first electrode of the second transistor is electrically connected with the second electrode of the clamping diode, and the first electrode of the second transistor is connected with the control end of the output module.

Optionally, the resistance value of the first resistor is a ratio of the reference voltage of the clamping diode to the preset current value.

Optionally, when the protection module is connected between the first power source and the first end of the output module, the protection module includes a fuse or a current limiting protector; the fuse or the current limiting protector is connected to the first power supply and the first end of the output module.

Optionally, the enabling module includes a third resistor, a fourth resistor, and a third transistor;

the first end of the third resistor is electrically connected with the output port of the controller;

the control electrode of the third transistor is electrically connected with the second end of the third resistor, the first electrode of the third transistor is electrically connected with the control end of the output module, and the second electrode of the third transistor is electrically connected with a second power supply;

the first end of the fourth resistor is electrically connected with the control electrode of the third transistor, and the second end of the fourth resistor is electrically connected with the second electrode of the third transistor.

Optionally, the driving circuit further includes a fifth resistor;

the fifth resistor is connected between the first end of the enabling module and the control end of the output module.

Optionally, the load module includes a sixth resistor;

the first end of the sixth resistor is electrically connected with the second end of the output module, and the second end of the sixth resistor is electrically connected with a second power supply.

According to another aspect of the present utility model, there is provided a battery management system including a controller and the drive circuit according to any one of the embodiments of the present utility model;

and an output interface of the controller is connected with the driving circuit.

According to another aspect of the present utility model, there is provided a vehicle comprising the battery management system according to any one of the embodiments of the present utility model.

According to the technical scheme, the protection module can comprise the current limiting device to limit the current of the output module through the arrangement of the independent protection module, so that the current of the output driving signal is limited, and the current value of the driving signal is smaller than or equal to the preset current value. The protection module may include a voltage limiting device limiting a voltage of the output module, thereby limiting a current of the output module, and further limiting an output current value output from the output module to the external device, such that the output current value is less than or equal to a preset current value. Therefore, the protection of the driving circuit and the external equipment is realized, and the damage to the external equipment caused by the overlarge output current value when the load module is in short circuit is avoided, and the damage to devices caused by the overlarge current in the driving circuit is avoided. And moreover, the current of the driving circuit is limited by adopting an independent protection module, an integrated driving device with protection is not needed, and the power consumption of the first power supply is not increased, so that the energy is saved, and the cost is reduced.

It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the utility model or to delineate the scope of the utility model. Other features of the present utility model will become apparent from the description that follows.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic diagram of a driving circuit according to an embodiment of the present utility model;

FIG. 2 is a schematic diagram of a driving circuit according to another embodiment of the present utility model;

FIG. 3 is a schematic diagram of a driving circuit according to another embodiment of the present utility model;

fig. 4 is a schematic circuit diagram of a battery management system according to an embodiment of the present utility model.

Detailed Description

In order that those skilled in the art will better understand the present utility model, a technical solution in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present utility model without making any inventive effort, shall fall within the scope of the present utility model.

It should be noted that the terms "first," "second," and the like in the description and the claims of the present utility model and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the utility model described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

The battery management system includes a controller that transmits a control signal to an external device (e.g., a fan, another controller), etc., but the current and voltage of the control signal output from the port of the controller are small, and thus a good control effect cannot be achieved, so a driving circuit is provided between the controller and the external device. The driving circuit converts the control signal output by the controller into a driving signal with higher voltage and higher current (the voltage of the control signal is higher than that of the control signal output by the controller and the current of the control signal is higher than that of the control signal) according to the requirement of the external equipment, so that the driving control of the external equipment is realized. However, the existing driving circuit is an integrated circuit with protection, and the output current of the integrated circuit is higher than the required current of external equipment, so that the energy of a battery is wasted, and the cost is increased.

In view of the foregoing technical problems, the technical solution of this embodiment provides a driving circuit, which is applied to a battery management system. Fig. 1 is a schematic structural diagram of a driving circuit according to an embodiment of the present utility model, and referring to fig. 1, the driving circuit includes: an enable module 110, an output module 120, a load module 130, and a protection module 140; the control end of the enabling module 110 is connected with an output port A1 of a controller of the battery management system, and the enabling module 110 is configured to output an enabling signal when receiving a first level signal output by the controller; the control end of the output module 120 is connected to the first end of the enable module 110, the first end of the output module 120 is connected to the first power supply, and the output module 120 is configured to output a driving signal to the external device 210 when receiving the enable signal; the load module 130 is connected to the second end of the output module 120; the protection module 140 is connected between the first power source V1 and the first end of the output module 120, and/or the first end of the protection module 140 is connected with the first power source V1, and the second end of the protection module 140 is connected with the control end of the output module 120; the protection module 140 is configured to limit the output current value output by the output module 120 to the external device 210 to be less than or equal to a preset current value.

The enabling module 110 determines whether to output the enabling signal according to the level signal of the output port A1 of the controller, and when the first level signal of the output port A1 of the controller is received, for example, the first level signal is a high level signal, the enabling module 110 is turned on, and the enabling module 110 outputs the enabling signal to the output module 120. The output module 120 is turned on after receiving the enable signal, and outputs the voltage of the first power V1, thereby outputting a driving signal with a larger voltage and a larger current, so as to facilitate driving the external device 210. The first power source V1 is, for example, a power source that provides a positive voltage. The external device 210 is, for example, a cooling fan of a battery pack or a control board of another battery pack, and the driving signal is, for example, a fan driving signal or a control board auto code signal. In other embodiments, the external device 210 may also be a high voltage module in a battery pack, and the driving signal is, for example, a high voltage interlock signal. The load module 130 may limit the current of the output driving signal, thereby adjusting the current of the output driving signal according to the demand of the external device 210.

Specifically, the protection module 140, for example, is a current limiting module, and includes a current limiting device connected between the first power source V1 and the first end of the output module 120, and limits the current of the output module 120, so as to limit the current of the output driving signal, so that the current value of the driving signal is less than or equal to the preset current value. The protection module 140 is, for example, a voltage limiting module, a first end of the protection module 140 is connected to a first end of the output module 120, a second end of the protection module 140 is connected to a control end of the output module 120, and limits the voltage of the output module 120, thereby limiting the current of the output module 120, and further limiting the output current value output by the output module 120 to the external device 210, so that the output current value is smaller than or equal to a preset current value. Thus, protection of the driving circuit and the external device 210 is realized, and damage to the external device 210 caused by overlarge output current value when the load module 130 is in short circuit is avoided, and damage to devices caused by overlarge current in the driving circuit is avoided. And, adopt independent protection module 140 to restrict the electric current of drive circuit, need not to adopt the integrated drive arrangement of taking the protection, can not increase the consumption of first power V1 to the energy saving has reduced the cost.

Furthermore, in some embodiments, a single protection module 140 may be used, where the protection module 140 is connected between the first power source V1 and the first end of the output module 120, or where the first end of the protection module 140 is connected to the first end of the output module 120, and where the second end of the protection module 140 is connected to the control end of the output module 120. In other embodiments, two protection modules 140 may be provided, wherein one protection module 140 is connected between the first power source V1 and the first end of the output module 120; the first end of the other protection module 140 is connected with the first end of the output module 120, and the second end of the other protection module 140 is connected with the control end of the output module 120, and meanwhile, voltage and current limiting are performed on the output module 120, so that the limitation of the output current value is further ensured.

In fig. 1, only the first end of the protection module 140 is connected to the first end of the output module 120, and the second end of the protection module 140 is connected to the control end of the output module 120.

According to the technical scheme, by arranging the independent protection module, the protection module can comprise a current limiting device to limit the current of the output module, so that the current of the output driving signal is limited, and the current value of the driving signal is smaller than or equal to a preset current value. The protection module may include a voltage limiting device limiting a voltage of the output module, thereby limiting a current of the output module, and further limiting an output current value output from the output module to the external device, such that the output current value is less than or equal to a preset current value. Therefore, the protection of the driving circuit and the external equipment is realized, and the damage to the external equipment caused by the overlarge output current value when the load module is in short circuit is avoided, and the damage to devices caused by the overlarge current in the driving circuit is avoided. And moreover, the current of the driving circuit is limited by adopting an independent protection module, an integrated driving device with protection is not needed, and the power consumption of the first power supply is not increased, so that the energy is saved, and the cost is reduced.

On the basis of the above technical solution, fig. 2 is a schematic structural diagram of a driving circuit according to another embodiment of the present utility model, optionally, referring to fig. 2, the output module 120 includes a first transistor Q1, a first resistor R1 and a second resistor R2; the first end of the first resistor R1 is electrically connected with a first power supply V1; the control electrode of the first transistor Q1 is connected to the first end of the enabling module 110, the first electrode of the first transistor Q1 is electrically connected to the second end of the first resistor R1, and the second electrode of the first transistor Q1 is electrically connected to the load module 130; a first end of the second resistor R2 is electrically connected with the first power supply V1, and a second end of the second resistor R2 is electrically connected with a control electrode of the first transistor Q1; the protection module 140 is connected between the first power source V1 and the first end of the first resistor R1, and/or the first end of the protection module 140 is electrically connected to the first power source V1, and the second end of the protection module 140 is electrically connected to the control electrode of the first transistor Q1.

Specifically, the first transistor Q1 is, for example, a triode, and when the control electrode of the first transistor Q1 receives the enable signal, the first transistor Q1 is turned on, so that the voltage divided by the first resistor R1 from the first power source V1 is output, and a driving signal is output. The first transistor Q1 is, for example, a P-type transistor, and the enable signal is a low signal. In other embodiments, the first transistor Q1 may be an N-type transistor, which is not limited in this embodiment.

The specific structure of the protection module is described below, but is not limiting to the present application.

In one embodiment, optionally, referring to fig. 2, when the first end of the protection module 140 is connected to the first power source V1 and the second end of the protection module 140 is connected to the control end of the output module 120, the protection module 140 includes a clamp diode D1 and a second transistor Q2; a first pole of the clamping diode D1 is electrically connected with a first power supply V1; the control electrode of the second transistor Q2 is electrically connected to the control electrode of the first transistor Q1, the first electrode of the second transistor Q2 is electrically connected to the second electrode of the clamp diode D1, and the first electrode of the second transistor Q2 is connected to the control end of the output module 120.

Specifically, the clamping diode D1 is, for example, a zener diode, and the second transistor Q2 is, for example, a triode. When the enable module 110 does not output the enable signal, the output module 120 is not turned on, and the second transistor Q2 is not turned on. After the output module 120 outputs the enable signal, the output module 120 and the second transistor Q2 are turned on. When the output module 120 normally outputs the driving signal, that is, when the load module 130 is not shorted, the clamp diode D1 is not turned on. When the load module 130 is shorted, the clamping diode D1 breaks down and turns on, the first pole of the clamping diode D1 is electrically connected with the first power supply V1, so that the potential of the first pole of the clamping diode D1 is unchanged, the potential of the second pole of the clamping diode D1 is clamped by the clamping diode D1, and the potential of the first pole and the second pole of the second transistor Q2 is limited by clamping the reference voltage of the clamping diode D1, and then the potential of the first pole and the second pole of the first transistor Q1 is limited, namely, the potential of the second end of the first resistor R1 is limited. The first end of the first resistor R1 is connected with the first power supply V1, and the potential of the first end of the first resistor R1 is unchanged, so that the potentials of the two ends of the first resistor R1 are limited, and the current of the first resistor R1 is further limited.

Thus, the current of the output module 120 is limited, so that the current of the driving signal output by the output module 120 is limited, and the damage to devices caused by excessive current in the driving circuit is avoided. And, the cost of clamp diode D1 and second transistor Q2 is lower, and the consumption is less, is favorable to reducing the energy consumption, reduce the cost.

Optionally, the resistance of the first resistor R1 is a ratio of the reference voltage of the clamp diode D1 to a preset current value.

Specifically, the reference voltage of the clamp diode D1 is the clamp voltage of the clamp diode D1, and by setting the resistance value of the first resistor R1 to be the ratio of the reference voltage of the clamp diode D1 to the preset current value, the current of the first resistor R1 can be smaller than or equal to the preset current value, so that the current of the driving signal output by the output module 120 is limited, and damage to devices caused by excessive current in the driving circuit is avoided.

In another implementation, fig. 3 is a schematic structural diagram of still another driving circuit according to an embodiment of the present utility model, optionally, referring to fig. 3, when the protection module 140 is connected between the first power source V1 and the first end of the output module 120, the protection module 140 includes a fuse or a current limiting protector P1; the fuse or current limiting protector P1 is connected to the first power source V1 and the first end of the output module 120.

Specifically, the protection module 140 includes a fuse with a current limiting function, and after the load module 130 is shorted, the current in the driving circuit is greater than the set current of the fuse, the fuse is disconnected, and the driving circuit stops outputting the driving signal, so as to avoid damaging the device due to excessive current. Alternatively, the protection module 140 includes a current limiting protector P1, such as a positive temperature coefficient (Positive Temperature Coefficient, PTC) thermistor, and after the load module 130 is shorted, the current in the driving circuit is greater than a preset current value, so that the temperature of the driving circuit is increased, and the resistance is increased as the temperature of the PTC thermistor is increased, thereby limiting the current of the driving circuit and avoiding damage to the device due to excessive current.

In other embodiments, the protection module 140 may also include a fuse, which is not limited in this embodiment.

Note that, fig. 3 illustrates a case where the protection module 140 includes the current limiting protector P1, but is not limited thereto. In addition, when the protection module 140 includes a current limiting device, i.e., the protection module 140 is connected between the first power source V1 and the first terminal of the output module 120, the current of the first transistor Q1 is already limited, and the first resistor R1 may not be required to be provided. In some embodiments, the first resistor R1 may be provided, and the case where the first resistor R1 is not provided is illustrated in fig. 3, but the present utility model is not limited thereto.

Alternatively, referring to fig. 2 or 3, the enabling module 110 includes a third resistor R3, a fourth resistor R4, and a third transistor Q3; the first end of the third resistor R3 is electrically connected with the output port A1 of the controller; the control electrode of the third transistor Q3 is electrically connected to the second end of the third resistor R3, the first electrode of the third transistor Q3 is electrically connected to the control end of the output module 120, and the second electrode of the third transistor Q3 is electrically connected to the second power source V2; a first terminal of the fourth resistor R4 is electrically connected to the control electrode of the third transistor Q3, and a second terminal of the fourth resistor R4 is electrically connected to the second electrode of the third transistor Q3.

Specifically, the third transistor Q3 is, for example, a transistor, and when the output port A1 of the controller outputs the first level signal, the third transistor Q3 is turned on to output the voltage of the second power V2, thereby outputting the enable signal, so that the output module 120 is turned on. The third transistor Q3 is, for example, an N-type transistor, and the first level signal is a high level signal. In other embodiments, the third transistor Q3 may be a P-type transistor, which is not limited in this embodiment. The second power source V2 is, for example, grounded. In other embodiments, the second power source V2 may be a power source for providing a negative voltage, which is not limited in this example.

Optionally, referring to fig. 2 or 3, the driving circuit further includes a fifth resistor R5; the fifth resistor R5 is connected between the first terminal of the enable module 110 and the control terminal of the output module 120. Thus, the current limiting and partial pressure effects are realized.

Optionally, referring to fig. 2 or 3, the load module 130 includes a sixth resistor R6; the first end of the sixth resistor R6 is electrically connected to the second end of the output module 120, and the second end of the sixth resistor R6 is electrically connected to the second power source V2.

Specifically, the sixth resistor R6 has a current limiting function, so as to avoid an excessive output current value of the output module 120. When the sixth resistor R6 is shorted, the protection module 140 is configured to limit the current or the voltage of the output module 120, so as to limit the output current value output by the output module 120 to the external device 210 to be less than or equal to the preset current value, thereby avoiding damage to the external device 210 caused by overlarge output current value and avoiding damage to devices in the driving circuit caused by overlarge current in the driving circuit.

The present embodiment also provides a battery management system, fig. 4 is a schematic circuit diagram of a battery management system according to an embodiment of the present utility model, and referring to fig. 4, the battery management system includes a controller 20 and a driving circuit 10 provided in any of the foregoing embodiments; the output interface A1 of the controller 20 is connected to the driving circuit 10.

Specifically, by connecting the output interface A1 of the controller 20 with the driving circuit 10, the driving circuit 10 converts the control signal output by the controller 20 into a driving signal with a larger voltage and a larger current (a larger voltage than the control signal output by the controller and a larger current than the control signal) according to the requirements of the external device 210, so that the external device 210 can be driven conveniently. In addition, an independent protection module 140 is disposed in the driving circuit 10, and the protection module 140 limits the current or the voltage of the output module 120, so that the output current value output by the protection module 140 to the external device 210 is limited to be less than or equal to a preset current value, and the limitation of the driving signal current is realized. Thus, the protection of the driving circuit 10 and the external device 210 is realized, and the damage to the external device 210 caused by the overlarge output current value when the load module 130 is in short circuit is avoided, and the damage to devices caused by the overlarge current in the driving circuit 10 is avoided. In addition, the current of the driving circuit 10 is limited by adopting the independent protection module 140, an integrated driving device with protection is not needed, and the power consumption is not increased, so that the energy is saved, and the cost is reduced.

The present embodiment also provides a vehicle, which includes the battery management system provided in any of the above embodiments, so that the vehicle has the same beneficial effects as the battery management system provided in any of the above embodiments, and will not be described herein.

The above embodiments do not limit the scope of the present utility model. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included in the scope of the present utility model.

Claims (10)

1. A driving circuit, which is applied to a battery management system, comprising:

the control end of the enabling module is connected with the output port of the controller of the battery management system, and the enabling module is configured to output an enabling signal when receiving a first level signal output by the controller;

the control end of the output module is connected with the first end of the enabling module, the first end of the output module is connected with a first power supply, and the output module is configured to output a driving signal to external equipment when receiving the enabling signal;

the load module is connected with the second end of the output module;

the protection module is connected between the first power supply and the first end of the output module, and/or the first end of the protection module is connected with the first power supply, and the second end of the protection module is connected with the control end of the output module; the protection module is configured to limit the output current value output to the external device by the output module to be smaller than or equal to a preset current value.

2. The drive circuit of claim 1, wherein the output module comprises a first transistor, a first resistor, and a second resistor;

the first end of the first resistor is electrically connected with the first power supply;

the control electrode of the first transistor is connected with the first end of the enabling module, the first electrode of the first transistor is electrically connected with the second end of the first resistor, and the second electrode of the first transistor is electrically connected with the load module;

a first end of the second resistor is electrically connected with the first power supply, and a second end of the second resistor is electrically connected with a control electrode of the first transistor;

the protection module is connected between the first power supply and the first end of the first resistor, and/or the first end of the protection module is electrically connected with the first power supply, and the second end of the protection module is electrically connected with the control electrode of the first transistor.

3. The drive circuit of claim 2, wherein the protection module comprises a clamp diode and a second transistor when the first end of the protection module is connected to the first power supply and the second end of the protection module is connected to the control end of the output module;

a first pole of the clamping diode is electrically connected with the first power supply;

the control electrode of the second transistor is electrically connected with the control electrode of the first transistor, the first electrode of the second transistor is electrically connected with the second electrode of the clamping diode, and the first electrode of the second transistor is connected with the control end of the output module.

4. The driving circuit of claim 3, wherein the first resistor has a resistance value that is a ratio of the reference voltage of the clamp diode to the preset current value.

5. The drive circuit of claim 1, wherein the protection module comprises a fuse or a current limiting protector when the protection module is connected between the first power source and the first end of the output module; the fuse or the current limiting protector is connected to the first power supply and the first end of the output module.

6. The drive circuit according to any one of claims 1 to 5, wherein the enabling module includes a third resistor, a fourth resistor, and a third transistor;

the first end of the third resistor is electrically connected with the output port of the controller;

the control electrode of the third transistor is electrically connected with the second end of the third resistor, the first electrode of the third transistor is electrically connected with the control end of the output module, and the second electrode of the third transistor is electrically connected with a second power supply;

the first end of the fourth resistor is electrically connected with the control electrode of the third transistor, and the second end of the fourth resistor is electrically connected with the second electrode of the third transistor.

7. The drive circuit according to any one of claims 1 to 5, further comprising a fifth resistor;

the fifth resistor is connected between the first end of the enabling module and the control end of the output module.

8. The drive circuit according to any one of claims 1 to 5, wherein the load module includes a sixth resistor;

the first end of the sixth resistor is electrically connected with the second end of the output module, and the second end of the sixth resistor is electrically connected with a second power supply.

9. A battery management system comprising a controller and the drive circuit of any one of claims 1-8;

and an output interface of the controller is connected with the driving circuit.

10. A vehicle comprising the battery management system of claim 9.