Vehicle maintenance power-off circuit and power-off method

Abstract

The invention discloses a vehicle and a maintenance power-off circuit and a power-off method thereof. The vehicle maintenance power-off circuit is used for powering off a high-voltage power supply module of a vehicle and comprises a low-voltage power supply module and a maintenance module, and the maintenance module is connected between a battery management unit of the low-voltage power supply module and a battery management unit of the high-voltage power supply module. The maintenance module is used for switching on or switching off the power supply of the low-voltage power supply module to the battery management unit, and is also used for switching on or switching off a high-voltage interlocking loop of the battery management unit; the battery management unit is used for controlling the high-voltage power supply module to output electric energy when the high-voltage interlocking loop is switched on; or when the high-voltage interlocking loop is disconnected, the high-voltage power supply module is controlled to stop electric energy output. The power-off reliability of the vehicle is improved.

Description

Technical Field

[0001] This invention relates to the field of battery control technology, and in particular to a power-off circuit and power-off method for vehicle maintenance. Background Technology

[0002] With the continuous development of the automotive industry, the number of vehicles on the road is increasing, and the number of vehicles requiring maintenance each year is also rising. This is especially true for new energy vehicles, which typically use high-voltage power supply modules to power high-voltage components. During vehicle maintenance, it is necessary to disconnect the power output from these high-voltage power supply modules.

[0003] To cut off the power output of the high-voltage power supply module and ensure the safety of maintenance personnel, vehicles typically use software control logic to cut off the power output. When the software control logic malfunctions, it cannot effectively cut off the high-voltage power output, nor can it effectively control the high-voltage power supply module, resulting in poor reliability. Summary of the Invention

[0004] This invention provides a power-off circuit and method for vehicle maintenance to solve the problem of poor reliability of vehicle power-off.

[0005] According to one aspect of the present invention, a vehicle maintenance power-off circuit is provided, characterized in that it is used to disconnect the high-voltage power supply module of the vehicle, the vehicle maintenance power-off circuit comprising:

[0006] A low-voltage power supply module and a maintenance module are provided. The maintenance module is connected between the low-voltage power supply module and the battery management unit of the high-voltage power supply module. The maintenance module is used to connect or disconnect the power supply from the low-voltage power supply module to the battery management unit, and also to connect or disconnect the high-voltage interlock circuit of the battery management unit.

[0007] The battery management unit is used to control the high-voltage power supply module to output power when the high-voltage interlock circuit is on; or to control the high-voltage power supply module to stop outputting power when the high-voltage interlock circuit is off.

[0008] Optionally, the maintenance module includes: a first maintenance unit and a second maintenance unit;

[0009] The first end of the first repair unit is connected to the output end of the low-voltage power supply module, and the second end of the first repair unit is connected to the power supply end of the battery management unit. The first end and the second end of the first repair unit are not connected.

[0010] The third and fourth terminals of the first maintenance unit are both connected to the high-voltage interlock circuit of the battery management unit, but the third and fourth terminals of the first maintenance unit are not connected.

[0011] The second repair unit is used to short-circuit the first and second terminals of the first repair unit, and / or to short-circuit the third and fourth terminals of the first repair unit.

[0012] Optionally, the first repair unit includes a repair socket; the second repair unit includes a repair plug.

[0013] Alternatively, the first maintenance unit may include a maintenance plug; the second maintenance unit may include a maintenance socket.

[0014] Optionally, when the maintenance module is in a locked state, the maintenance plug short-circuit the first and second terminals of the maintenance socket;

[0015] When the maintenance module is in the secondary locking state, the maintenance plug short-circuit the first and second terminals of the maintenance socket, and short-circuit the third and fourth terminals of the maintenance socket;

[0016] When the maintenance module is in the off state, the maintenance plug disconnects the connection between the first and second ends of the maintenance socket, and disconnects the connection between the third and fourth ends of the maintenance socket.

[0017] Optionally, the high-voltage power supply module includes: a high-voltage power supply, a fuse, a main positive relay, a main negative relay, and a battery management unit. The first terminal of the high-voltage power supply is connected to the first terminal of the fuse, the second terminal of the fuse is connected to the first terminal of the main positive relay, the second terminal of the main positive relay is connected to the high-voltage output terminal, the second terminal of the high-voltage power supply is connected to the first terminal of the main negative relay, and the second terminal of the main negative relay is connected to the high-voltage output terminal. The battery management unit is connected to the control terminals of the main positive relay and the main negative relay.

[0018] The battery management unit controls whether the high-voltage power supply module outputs power by controlling the on / off state of the main positive relay and the main negative relay.

[0019] According to another aspect of the present invention, a vehicle maintenance power disconnection method is provided, applied to the vehicle maintenance power disconnection circuit described in any embodiment of the present invention, the vehicle maintenance power disconnection method comprising:

[0020] The maintenance module disconnects the high-voltage interlock circuit of the battery management unit while maintaining the power supply from the low-voltage power supply module to the battery management unit; the battery management unit stops the power output of the high-voltage power supply module.

[0021] After the initial delay, the maintenance module disconnects the power supply from the low-voltage power supply module to the battery management unit, and the battery management unit is powered off.

[0022] Optionally, the step of disconnecting the high-voltage interlock circuit of the battery management unit through the maintenance module while maintaining the power supply from the low-voltage power supply module to the battery management unit, and the battery management unit stopping the power output of the high-voltage power supply module, includes:

[0023] The third and fourth terminals of the first repair unit are disconnected by the second repair unit, while the first and second terminals of the first repair unit remain short-circuited.

[0024] The battery management unit remains energized and stops the power output of the high-voltage power supply module.

[0025] Optionally, after the first delay, the maintenance module disconnects the power supply from the low-voltage power supply module to the battery management unit, and the power-off of the battery management unit includes:

[0026] The high-voltage power supply module discharges voltage immediately.

[0027] The battery management unit is powered off when the first and second terminals of the first maintenance unit are disconnected by the second maintenance unit; the high-voltage power supply module remains in a state where power output is stopped.

[0028] Optionally, before the high-voltage interlock circuit of the battery management unit is cut off by the maintenance module while maintaining the power supply from the low-voltage power supply module to the battery management unit, and before the battery management unit stops the power output of the high-voltage power supply module, the following steps are included:

[0029] The system determines whether the vehicle is in motion; if the vehicle is in motion, the maintenance module maintains the power supply from the low-voltage power supply module to the battery management unit.

[0030] Optionally, after a first delay, the maintenance module disconnects the power supply from the low-voltage power supply module to the battery management unit. After the battery management unit is powered off, the following steps are taken:

[0031] After the repair is completed, the low-voltage power supply module supplies power to the battery management unit through the repair module, and the battery management unit is powered on.

[0032] The high-voltage interlock circuit of the battery management unit is activated by the maintenance module, and the battery management unit controls the high-voltage power supply module to output electrical energy.

[0033] According to another aspect of the present invention, a vehicle is provided, comprising: a vehicle maintenance power-off circuit as described in any embodiment of the present invention.

[0034] The technical solution provided by this invention, by setting up a maintenance module and a low-voltage power supply module, can both connect and disconnect the high-voltage interlock circuit of the battery management unit through the maintenance module, and connect or disconnect the power supply from the low-voltage power supply module to the battery management unit. This achieves effective control over the power output of the high-voltage power supply module, effectively cutting off the power supply to the high-voltage power supply module and preventing electric shock to personnel. Furthermore, it avoids direct disconnection of the high-voltage power supply module by the vehicle during operation. This invention does not require software control, avoiding the problem of ineffective power cutoff of the high-voltage power supply module when software control logic malfunctions, and has high reliability.

[0035] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 This is a schematic diagram of a vehicle maintenance power-off circuit according to an embodiment of the present invention;

[0038] Figure 2 This is a schematic diagram of another vehicle maintenance power-off circuit provided according to an embodiment of the present invention;

[0039] Figure 3 This is a schematic diagram of another vehicle maintenance power-off circuit provided according to an embodiment of the present invention;

[0040] Figure 4 This is a schematic diagram of a maintenance module in a locked state according to an embodiment of the present invention;

[0041] Figure 5 This is a schematic diagram of a maintenance module in a secondary locking state according to an embodiment of the present invention;

[0042] Figure 6 This is a schematic diagram of a maintenance module in a disconnected state according to an embodiment of the present invention;

[0043] Figure 7 This is a flowchart of a vehicle maintenance power disconnection method according to an embodiment of the present invention;

[0044] Figure 8 This is a flowchart of another vehicle maintenance power disconnection method provided according to an embodiment of the present invention. Detailed Implementation

[0045] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0046] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0047] This invention provides a vehicle maintenance power-off circuit for disconnecting the high-voltage power supply module of a vehicle. Figure 1 This is a schematic diagram of a vehicle maintenance power-off circuit provided in an embodiment of the present invention. (Reference) Figure 1 The vehicle maintenance power-off circuit includes a low-voltage power supply module 1 and a maintenance module 2. The maintenance module 2 is connected between the battery management unit 31 of the low-voltage power supply module 1 and the high-voltage power supply module 3. The maintenance module 2 is used to connect or disconnect the power supply from the low-voltage power supply module 1 to the battery management unit 31, and also to connect or disconnect the high-voltage interlock circuit 311 of the battery management unit 31. The battery management unit 31 is used to control the high-voltage power supply module 3 to output power when the high-voltage interlock circuit 311 is connected; or to control the high-voltage power supply module 3 to stop outputting power when the high-voltage interlock circuit 311 is disconnected.

[0048] When the vehicle is in motion, the maintenance module 2 is used to connect the low-voltage power supply module 1 to the battery management unit 31, and also to connect the high-voltage interlock circuit 311 of the battery management unit 31. At this time, the high-voltage power supply module 3 outputs electrical energy and provides electrical energy to the various high-voltage devices of the vehicle. For example, the high-voltage devices may include motors, air conditioners, motor controllers, etc., and the high-voltage interlock circuit 311 can form an interlock with the integrated connectors of the various high-voltage devices in the high-voltage power supply module 3. The battery management unit 31 monitors the electrical integrity of the vehicle's high-voltage devices, electrical circuits, and other components through the high-voltage interlock circuit 311.

[0049] Because the output voltage of the high-voltage power supply module 3 is high, it is necessary to disconnect the power output of the high-voltage power supply module 3 during vehicle maintenance or repair. By setting up a high-voltage interlock circuit 311, the high-voltage interlock fault can be triggered by disconnecting the high-voltage interlock circuit 311, thereby realizing the control of the power output of the high-voltage power supply module 3.

[0050] Specifically, during vehicle maintenance, maintenance module 2 first disconnects the high-voltage interlock circuit 311 of battery management unit 31 and triggers a high-voltage interlock fault. Maintenance module 2 maintains the power supply from low-voltage power supply module 1 to battery management unit 31. At this time, battery management unit 31 can still control high-voltage power supply module 3. Battery management unit 31 can stop the power output of high-voltage power supply module 3 by disconnecting relays and other devices in high-voltage power supply module 3.

[0051] When the high-voltage power supply module 3 stops outputting power, it discharges voltage. For example, within one second, the output voltage of the high-voltage power supply module 3 can be discharged to below 60V. At this time, the output voltage of the high-voltage power supply module 3 is within the range of safe voltage for the human body. Afterwards, the maintenance module 2 can disconnect the power supply from the low-voltage power supply module 1 to the battery management unit 31. The battery management unit 31, due to power loss, also loses control over the high-voltage power supply module 3. Since the high-voltage power supply module 3 has no power output and the battery management unit 31 is de-energized, the high-voltage power supply module 3 remains uncontrolled and in a state of no power output. Therefore, the vehicle is essentially completely disconnected from the high-voltage power supply module 3 and is in a state without high voltage, providing a high level of safety for personnel performing vehicle maintenance.

[0052] After the staff completes the vehicle repair, it is necessary to restore the power supply to the high-voltage power supply module 3. At this time, the low-voltage power supply module 1 can be connected to the battery management unit 31 through the repair module 2. The battery management unit 31 restores the low-voltage power supply and can detect the vehicle status, such as whether the fault has been repaired. When the repair is completed, the repair module 2 connects the high-voltage interlock circuit 311 of the battery management unit 31. At this time, the battery management unit 31 can control the high-voltage power supply module 3 to restore the power output.

[0053] Therefore, even when the battery management unit 31 detects a fault in a high-voltage device through the high-voltage interlock circuit 311, the present invention can still maintain control over the power supply module 3 by setting up the maintenance module 2 and disconnecting the high-voltage interlock circuit 311. This avoids electric shock to personnel caused by the inability to cut off the power output of the high-voltage power supply module 3 due to a fault during maintenance. Furthermore, if the battery management unit 31 detects a false fault in a high-voltage device while the vehicle is in motion, the low-voltage power supply module 1 can maintain power supply to the battery management unit 31 through the maintenance module 2, ensuring the normal operation of the battery management unit 31 and the power output of the high-voltage power supply module 3, thus preventing traffic accidents caused by power loss while the vehicle is in motion.

[0054] The technical solution provided by this invention, by setting up a maintenance module and a low-voltage power supply module, can both connect and disconnect the high-voltage interlock circuit of the battery management unit through the maintenance module, and connect or disconnect the power supply from the low-voltage power supply module to the battery management unit. This achieves effective control over the power output of the high-voltage power supply module, effectively cutting off the power supply to the high-voltage power supply module and preventing electric shock to personnel. Furthermore, it avoids direct disconnection of the high-voltage power supply module by the vehicle during operation. This invention does not require software control, avoiding the problem of ineffective power cutoff of the high-voltage power supply module when software control logic malfunctions, and has high reliability.

[0055] Figure 2 This is a schematic diagram of another vehicle maintenance power-off circuit provided in an embodiment of the present invention. (Reference) Figure 2 Based on the above embodiments, optionally, the maintenance module 2 includes: a first maintenance unit 21 and a second maintenance unit 22. The first end of the first maintenance unit 21 is connected to the output end of the low-voltage power supply module 1, and the second end of the first maintenance unit 21 is connected to the power supply end of the battery management unit 31; the first and second ends of the first maintenance unit 21 are not connected. The third and fourth ends of the first maintenance unit 21 are both connected to the high-voltage interlock circuit 311 of the battery management unit 31; the third and fourth ends of the first maintenance unit 21 are not connected. The second maintenance unit 22 is used to short-circuit the first and second ends of the first maintenance unit 21, and / or short-circuit the third and fourth ends of the first maintenance unit 21.

[0056] The first maintenance unit 21 and the second maintenance unit 22 are used to control the power supply status of the battery management unit 31. When the second maintenance unit 22 short-circuits the first and second terminals of the first maintenance unit 21, a path is formed between the battery management unit 31 and the low-voltage power supply module 1, and the battery management unit 31 is energized. During normal vehicle operation, the low-voltage power supply module 1 always supplies power to the battery management unit 31.

[0057] When the second maintenance unit 22 disconnects the first and second terminals of the first maintenance unit 21, the low-voltage power supply module 1 cannot continue to supply power to the battery management unit 31, the battery management unit 31 loses power, and thus loses control of the high-voltage power supply module 3.

[0058] The first maintenance unit 21 and the second maintenance unit 22 are also used to adjust the connection status of the high-voltage interlock circuit 311. When the second maintenance unit 22 short-circuits the third and fourth terminals of the first maintenance unit 21, the high-voltage interlock circuit 311 forms a circuit and is energized. The battery management unit 31 can monitor the high-voltage devices through the high-voltage interlock circuit 311.

[0059] When the second maintenance unit 22 disconnects the third and fourth terminals of the first maintenance unit 21, it is equivalent to triggering a high-voltage interlock fault, and the power output of the high-voltage power supply module 3 can be disconnected through the battery management unit 31.

[0060] Figure 3 This is a schematic diagram of another vehicle maintenance power-off circuit provided in an embodiment of the present invention. (Reference) Figure 3 Based on the above embodiments, optionally, the first maintenance unit 21 includes a maintenance socket 211. The second maintenance unit 22 includes a maintenance plug 221. The maintenance socket 211 is plugged into the maintenance plug 221. Alternatively, the first maintenance unit 21 includes a maintenance plug; and the second maintenance unit 22 includes a maintenance socket.

[0061] Figure 3 An exemplary illustration shows a first maintenance unit 21 being a maintenance socket 211 and a second maintenance unit 22 being a maintenance plug 221. By inserting the maintenance plug 221 into the maintenance socket 211, the first and second ends of the first maintenance unit 21 can be shorted through the maintenance plug 221. The third and fourth ends of the first maintenance unit 21 can also be shorted through the maintenance plug 221.

[0062] In other embodiments, the first maintenance unit 21 can be configured as a maintenance plug, and the second maintenance unit 22 can be configured as a maintenance socket. By plugging the maintenance plug into the maintenance socket, and short-circuiting the first and second ends of the first maintenance unit 21 through the maintenance socket, the third and fourth ends of the first maintenance unit 21 can also be short-circuited through the maintenance socket.

[0063] Optionally, the high-voltage power supply module 3 includes: a high-voltage power supply 32, a fuse FU, a main positive relay K1, a main negative relay K2, and a battery management unit 31. The first terminal of the high-voltage power supply 32 is connected to the first terminal of the fuse FU, the second terminal of the fuse FU is connected to the first terminal of the main positive relay K1, the second terminal of the main positive relay K1 is connected to the high-voltage output terminal 33, and the second terminal of the high-voltage power supply 32 is connected to the first terminal of the main negative relay K2. The second terminal of the main negative relay K2 is also connected to the high-voltage output terminal 33. The battery management unit 31 is connected to the control terminals of the main positive relay K1 and the main negative relay K2. The battery management unit 31 controls whether the high-voltage power supply module 3 outputs power by controlling the on / off state of the main positive relay K1 and the main negative relay K2.

[0064] Optionally, the high-voltage power supply module 3 may further include a pre-charge resistor R1 and a pre-charge relay K3, connected in series between the first and second terminals of the main positive relay K1, with the battery management unit 31 connected to the control terminal of the pre-charge relay K3. The high-voltage power supply module may also include a low-voltage output terminal 34 for connecting the battery management unit 31 and the service socket 211.

[0065] The battery management unit 31 controls the power output of the high-voltage output terminal 33 by controlling the on / off state of the main positive relay K1 and the main negative relay K2. The power output from the high-voltage output terminal 33 is the power output from the high-voltage power supply module 3.

[0066] Figure 4 This is a schematic diagram of a maintenance module in a locked state according to an embodiment of the present invention. Figure 5 This is a schematic diagram of a maintenance module in a secondary locked state, provided by an embodiment of the present invention. Figure 6 This is a schematic diagram of a maintenance module in a disconnected state, provided by an embodiment of the present invention. (In conjunction with...) Figures 3-6 Based on the above embodiments, optionally, when the maintenance module is in a primary locked state, the maintenance plug 221 short-circuits the first and second terminals of the maintenance socket 211. When the maintenance module is in a secondary locked state, the maintenance plug 221 short-circuits the first and second terminals of the maintenance socket 211, and also short-circuits the third and fourth terminals of the maintenance socket 211. When the maintenance module is in a deactivated state, the maintenance plug 221 disconnects the connection between the first and second terminals of the maintenance socket 211, and also disconnects the connection between the third and fourth terminals of the maintenance socket 211.

[0067] During normal vehicle operation, the maintenance module is in a secondary lockout state.

[0068] When the vehicle needs maintenance, the maintenance module is first adjusted to a locked state, the high-voltage interlock circuit 311 is disconnected and the high-voltage interlock fault is triggered. Subsequently, the battery management unit 31 controls the main positive relay K1 and the main negative relay K2 to disconnect, and the maintenance module is adjusted to the disconnected state. Without the power supply from the low-voltage power supply module, the battery management unit 31 cannot control the main positive relay K1 and the main negative relay K2. The main positive relay K1 and the main negative relay K2 remain in the disconnected state, and the high-voltage power supply module does not output power.

[0069] After vehicle repairs are completed, power needs to be restored to the high-voltage power supply module. First, the repair module is adjusted to a primary lockout state. At this time, the battery management unit 31 is energized and activated, and can be used to diagnose whether the vehicle fault repair is complete. Because the high-voltage interlock circuit 311 is still open, the high-voltage power supply module 3 cannot be powered on immediately. Once the vehicle has been diagnosed and the fault repair is confirmed, the repair module is adjusted to a secondary lockout state. The high-voltage interlock circuit 311 is then connected, the high-voltage interlock fault is released, and the battery management unit 31 can control the main positive relay K1 and the main negative relay K2 to conduct, restoring power to the high-voltage power supply module 3.

[0070] The embodiments of the present invention achieve effective control of the high-voltage power supply module by setting a primary lock-in state, a secondary lock-in state, and a disconnect state, and by using different states at different stages, thus achieving a good control effect.

[0071] Table 1

[0072]

[0073] Table 1 shows the vehicle handling strategy for different combinations of the maintenance module provided in this embodiment of the invention. Referring to Table 1, the low-voltage power supply module can be a 12V power supply. When the high-voltage interlock circuit is on and the battery management unit receives 12V, the vehicle operates normally without abnormalities. When the high-voltage interlock circuit is off and the battery management unit receives 12V, the instrument panel indicates an abnormality, but driving is not affected. When the high-voltage interlock circuit is on and the battery management unit has no voltage, the power supply circuit of the low-voltage power supply module is abnormal, and the vehicle cannot drive. When the high-voltage interlock circuit is off and the battery management unit has no voltage, the maintenance module is completely disconnected, and the vehicle cannot drive.

[0074] As shown in State 2 in Table 1, when the high-voltage interlock circuit is disconnected, whether it is a false alarm from the detection system or a failure of the maintenance module to be properly connected, the vehicle system will only indicate the fault status through the instrument panel. It will not affect driving, nor will it cut off the power output of the high-voltage power supply module during normal vehicle operation, thus preventing the vehicle from breaking down.

[0075] This invention also provides a vehicle maintenance power disconnection method, applicable to the vehicle maintenance power disconnection circuit provided in any embodiment of this invention. Figure 7 This is a flowchart illustrating a vehicle maintenance power-off method provided in an embodiment of the present invention. (See reference) Figure 7 Vehicle maintenance power disconnection methods include:

[0076] S110. The high-voltage interlock circuit of the battery management unit is cut off by the maintenance module, while maintaining the power supply from the low-voltage power supply module to the battery management unit; the battery management unit stops the power output of the high-voltage power supply module.

[0077] S120. After the first delay, the maintenance module disconnects the power supply from the low-voltage power supply module to the battery management unit, and the battery management unit is powered off.

[0078] Based on the above embodiments, optionally, in step S110, the high-voltage interlock circuit of the battery management unit is disconnected through the maintenance module, while maintaining the power supply from the low-voltage power supply module to the battery management unit; the battery management unit stops the power output of the high-voltage power supply module by: disconnecting the third and fourth terminals of the first maintenance unit through the second maintenance unit, while maintaining the short-circuit state of the first and second terminals of the first maintenance unit. The battery management unit remains energized and stops the power output of the high-voltage power supply module.

[0079] Based on the above embodiments, optionally, in S120, after a first delay, the maintenance module disconnects the power supply from the low-voltage power supply module to the battery management unit. The power-off of the battery management unit includes: the high-voltage power supply module discharging voltage within the first time; the first terminal and the second terminal of the first maintenance unit being disconnected through the second maintenance unit, and the battery management unit being powered off; the high-voltage power supply module maintaining a state where power output is stopped.

[0080] Figure 8 A flowchart illustrating another vehicle maintenance power disconnection method provided in an embodiment of the present invention. (See reference) Figure 8 Based on the above embodiments, optionally, in S110, before the maintenance module cuts off the high-voltage interlock circuit of the battery management unit and maintains the power supply from the low-voltage power supply module to the battery management unit, and before the battery management unit stops the power output of the high-voltage power supply module, the following steps are included: determining whether the vehicle is in a driving state; if the vehicle is in a driving state, the maintenance module maintains the power supply from the low-voltage power supply module to the battery management unit.

[0081] Based on the above embodiments, optionally, in S120, after a first delay, the maintenance module disconnects the power supply from the low-voltage power supply module to the battery management unit. After the battery management unit is powered off, the following steps are included:

[0082] S130. After the maintenance is completed, the low-voltage power supply module is connected to the battery management unit through the maintenance module, and the battery management unit is powered on.

[0083] S140. The high-voltage interlock circuit of the battery management unit is activated through the maintenance module, and the battery management unit controls the high-voltage power supply module to output electrical energy.

[0084] In the various embodiments of the vehicle maintenance power-off circuit, specific descriptions of the power-off methods for the vehicle maintenance power-off circuit are provided. These power-off methods can all be considered as the vehicle maintenance power-off methods provided in the embodiments of the present invention, and repeated content will not be described here.

[0085] This invention also provides a vehicle, including: a vehicle maintenance power-off circuit provided in any embodiment of this invention, which has similar beneficial effects to the vehicle maintenance power-off circuit, and will not be described in detail here.

[0086] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0087] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A vehicle service de-energizing circuit, characterized by, The vehicle maintenance power-off circuit is applied to a high-voltage power supply module of a vehicle, and the vehicle maintenance power-off circuit comprises: a low-voltage power supply module and a maintenance module connected between a battery management unit of the low-voltage power supply module and the high-voltage power supply module, the maintenance module being used to turn on or turn off the power supply of the low-voltage power supply module to the battery management unit and to turn on or turn off a high-voltage interlocking loop of the battery management unit; the battery management unit being used to control the high-voltage power supply module to output electric energy when the high-voltage interlocking loop is turned on or to control the high-voltage power supply module to stop outputting electric energy when the high-voltage interlocking loop is turned off.

2. The vehicle service de-energizing circuit of claim 1, wherein, The maintenance module comprises a first maintenance unit and a second maintenance unit. A first end of the first maintenance unit is connected to an output end of the low-voltage power supply module, a second end of the first maintenance unit is connected to a power supply end of the battery management unit, and the first end and the second end of the first maintenance unit are not connected. A third end of the first maintenance unit and a fourth end of the first maintenance unit are both connected to the high-voltage interlocking loop of the battery management unit, and the third end and the fourth end of the first maintenance unit are not connected. The second maintenance unit is used to short-circuit the first end and the second end of the first maintenance unit and / or short-circuit the third end and the fourth end of the first maintenance unit.

3. The vehicle service de-energizing circuit of claim 2, wherein, The first maintenance unit comprises a maintenance socket, and the second maintenance unit comprises a maintenance plug. Alternatively, the first maintenance unit comprises a maintenance plug, and the second maintenance unit comprises a maintenance socket.

4. The vehicle service de-energizing circuit of claim 3, wherein, When the maintenance module is in a primary locking state, the maintenance plug short-circuits the first end and the second end of the maintenance socket. When the maintenance module is in a secondary locking state, the maintenance plug short-circuits the first end and the second end of the maintenance socket and short-circuits the third end and the fourth end of the maintenance socket. When the maintenance module is in a disconnected state, the maintenance plug disconnects the connection between the first end and the second end of the maintenance socket and disconnects the connection between the third end and the fourth end of the maintenance socket.

5. The vehicle service de-energizing circuit of claim 1, wherein, The high-voltage power supply module comprises a high-voltage power supply, a fuse, a main positive relay, a main negative relay, and a battery management unit, a first end of the high-voltage power supply is connected to a first end of the fuse, a second end of the fuse is connected to a first end of the main positive relay, a second end of the main positive relay is connected to a high-voltage output end, a second end of the high-voltage power supply is connected to a first end of the main negative relay, and a second end of the main negative relay is connected to the high-voltage output end; the battery management unit is connected to control ends of the main positive relay and the main negative relay. The battery management unit controls the main positive relay and the main negative relay to be turned on or turned off to control whether the high-voltage power supply module outputs electric energy.

6. A vehicle repair power-off method characterized by, The vehicle maintenance power-off method is applied to the vehicle maintenance power-off circuit of any one of claims 1-5. cutting off a high-voltage interlock loop of the battery management unit by the maintenance module, and maintaining the low-voltage power supply module to supply power to the battery management unit; the battery management unit stops the high-voltage power supply module to output electric energy; after a first time delay, the maintenance module disconnects the low-voltage power supply module to supply power to the battery management unit, and the battery management unit is powered off.

7. The vehicle service de-energizing method according to claim 6, characterized by, cutting off a high-voltage interlock loop of the battery management unit by the maintenance module, and maintaining the low-voltage power supply module to supply power to the battery management unit; the battery management unit stops the high-voltage power supply module to output electric energy, comprising: the first end and the second end of the first maintenance unit are disconnected by the second maintenance unit, and the short circuit state of the first end and the second end of the first maintenance unit is maintained; the battery management unit maintains the powered state, and stops the high-voltage power supply module to output electric energy.

8. The vehicle service de-energizing method according to claim 6, characterized by, after a first time delay, the maintenance module disconnects the low-voltage power supply module to supply power to the battery management unit, and the battery management unit is powered off, comprising: in the first time, the high-voltage power supply module performs voltage bleeding; the first end and the second end of the first maintenance unit are disconnected by the second maintenance unit, and the battery management unit is powered off; the high-voltage power supply module maintains the state of stopping electric energy output.

9. The vehicle service de-energizing method according to claim 6, characterized by, cutting off a high-voltage interlock loop of the battery management unit by the maintenance module, and maintaining the low-voltage power supply module to supply power to the battery management unit; before the battery management unit stops the high-voltage power supply module to output electric energy, comprising: judging whether the vehicle is in a running state; if the vehicle is in the running state, the maintenance module maintains the low-voltage power supply module to supply power to the battery management unit.

10. The vehicle service de-energizing method according to claim 6, characterized by, after a first time delay, the maintenance module disconnects the low-voltage power supply module to supply power to the battery management unit, and the battery management unit is powered off, comprising: after the maintenance is completed, the low-voltage power supply module is turned on by the maintenance module to supply power to the battery management unit, and the battery management unit is powered on; the high-voltage interlock loop of the battery management unit is turned on by the maintenance module, and the battery management unit controls the high-voltage power supply module to output electric energy.

11. A vehicle comprising: The vehicle maintenance power-off circuit of any one of claims 1-5.

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