Control system, method and vehicle for safe disconnection of a vehicle high-voltage circuit

Abstract

The application provides a control system, method and vehicle for safely cutting off a high-voltage loop of a vehicle. The control system comprises a power domain controller and a battery execution and sampling unit. The power domain controller is connected to positive and negative bus bars of a power battery through a bleeder module. The battery execution and sampling unit is connected to the positive and negative bus bars. The positive and negative bus bars are respectively connected to positive and negative poles of battery modules in the power battery. The power domain controller is configured to send a high-voltage loop cutting-off instruction to the battery execution and sampling unit. The battery execution and sampling unit is configured to send a bleeder command to the power domain controller when the high-voltage loop in the power battery is disconnected in response to the high-voltage loop cutting-off instruction. The power domain controller is further configured to bleed the voltage between the positive and negative bus bars in response to the bleeder command. In this way, the control of the power domain controller and the battery execution and sampling unit can ensure the disconnection of the high-voltage loop and the voltage bleeding between the positive and negative bus bars, thereby ensuring the safety of the vehicle and related personnel.

Description

Technical Field

[0001] This application belongs to the field of power battery technology, specifically relating to a control system, method, and vehicle for safely disconnecting the high-voltage circuit of a vehicle. Background Technology

[0002] Currently, with the continuous increase in the number of electric vehicles nationwide, the degree of vehicle electrification is also constantly improving. Under certain special circumstances, the various high-voltage components carried by electric vehicles may pose certain safety risks to relevant personnel. Therefore, electric vehicles need to be able to disconnect the high-voltage circuit to ensure the personal safety of relevant personnel.

[0003] Traditional high-voltage circuit disconnection methods involve adding a high-voltage circuit breaker to the high-voltage circuit, and then disconnecting the high-voltage circuit of the power battery by turning off the high-voltage circuit breaker, thereby ensuring the personal safety of relevant personnel. However, the following problems exist: 1. The high-voltage circuit breaker has a limited number of uses; 2. It reduces the electrical insulation and airtightness of the power battery to some extent; 3. The high-voltage circuit breaker does not have overload protection and short-circuit protection functions, and there is a risk of electric shock in the high-voltage circuit when the electrical load in an electric vehicle is large. Therefore, there is an urgent need for a control system, method, and vehicle that can safely disconnect the high-voltage circuit of a vehicle to solve the above problems. Summary of the Invention

[0004] This application provides a control system, method, and vehicle for safely disconnecting the high-voltage circuit of a vehicle. By controlling the power domain controller and the battery execution and sampling unit in the control system, the high-voltage circuit in the power battery can be disconnected, which helps to eliminate the risk of electric shock and thus ensures the safety of electric vehicles and related personnel. By controlling the voltage discharge between the positive and negative busbars through the power domain controller, the safety of electric vehicles and related personnel is further guaranteed.

[0005] In a first aspect, embodiments of this application provide a control system for safely disconnecting a vehicle's high-voltage circuit, comprising: a power domain controller and a battery execution and sampling unit, wherein the power domain controller is connected to the positive and negative busbars of the power battery via a discharge module, the battery execution and sampling unit is connected to the positive and negative busbars, and the positive and negative busbars are respectively connected to the positive and negative terminals of the battery modules in the power battery;

[0006] The power domain controller is used to send a high-voltage circuit cut-off command to the battery execution and sampling unit;

[0007] The battery execution and sampling unit is used to respond to the high-voltage circuit cut-off command and send a discharge command to the power domain controller when the high-voltage circuit formed by the battery module and the positive and negative busbars is disconnected.

[0008] The power domain controller is also used to respond to the discharge command and discharge the voltage between the positive and negative buses through the discharge module.

[0009] Secondly, embodiments of this application provide a control method for safely disconnecting a vehicle's high-voltage circuit, applied to a battery execution and sampling unit corresponding to the vehicle's power battery. The vehicle also includes a power domain controller corresponding to the power battery. The power domain controller is connected to the positive and negative busbars of the power battery via a discharge module. The battery execution and sampling unit is connected to the positive and negative busbars, which are respectively connected to the positive and negative terminals of the battery modules within the power battery. The method includes:

[0010] Receive the high-voltage circuit disconnection command sent by the power domain controller;

[0011] In response to the high-voltage circuit disconnection command, when the high-voltage circuit formed by the battery module and the positive and negative buses is disconnected, a discharge command is sent to the power domain controller so that the power domain controller discharges the voltage between the positive and negative buses through the discharge module.

[0012] Thirdly, this application provides a control method for safely disconnecting a vehicle's high-voltage circuit, applied to a power domain controller corresponding to the vehicle's power battery. The vehicle also includes a battery execution and sampling unit corresponding to the power battery. The power domain controller is connected to the positive and negative busbars of the power battery via a discharge module. The battery execution and sampling unit is connected to the positive and negative busbars, which are respectively connected to the positive and negative terminals of the battery modules within the power battery. The method includes:

[0013] Send a high-voltage circuit cutoff command to the battery execution and sampling unit;

[0014] Upon receiving a discharge command sent by the battery execution and sampling unit in response to the high-voltage circuit cutoff command, the voltage between the positive and negative busbars is discharged through the discharge module in response to the discharge command.

[0015] Fourthly, this application provides an electric vehicle that includes a control system for safely disconnecting the vehicle's high-voltage circuit, as disclosed in the first aspect of the embodiments of this application.

[0016] Fifthly, this application provides a high-voltage safety maintenance control device applied to a battery execution and sampling unit corresponding to a vehicle's power battery. The vehicle also includes a power domain controller corresponding to the power battery. The power domain controller is connected to the positive and negative buses of the power battery via a discharge module. The battery execution and sampling unit is connected to the positive and negative buses, which are respectively connected to the positive and negative terminals of the battery modules within the power battery. The device includes:

[0017] The receiving unit is used to receive the high-voltage circuit cut-off command sent by the power domain controller;

[0018] The response unit is used to respond to the high-voltage circuit disconnection command. When the high-voltage circuit formed by the battery module and the positive and negative busbars is disconnected, the response unit sends a discharge command to the power domain controller so that the power domain controller discharges the voltage between the positive and negative busbars through the discharge module.

[0019] Sixthly, this application provides a control device for safely disconnecting a vehicle's high-voltage circuit, applied to a power domain controller corresponding to the vehicle's power battery. The vehicle also includes a battery execution and sampling unit corresponding to the power battery. The power domain controller is connected to the positive and negative buses of the power battery via a discharge module. The battery execution and sampling unit is connected to the positive and negative buses, which are respectively connected to the positive and negative terminals of the battery modules in the power battery. The device includes:

[0020] The transmitting unit sends a high-voltage circuit cut-off command to the battery execution and sampling unit;

[0021] When the response unit receives a discharge command sent by the battery execution and sampling unit in response to the high voltage circuit cutoff command, it responds to the discharge command and discharges the voltage between the positive and negative busbars through the discharge module.

[0022] In a seventh aspect, embodiments of this application provide a controller, including a processor, a memory, and one or more programs, the one or more programs being stored in the memory and configured to be executed by the processor, the programs including instructions for performing the steps as described in the second or third aspects of embodiments of this application.

[0023] Eighthly, embodiments of this application provide a computer-readable storage medium having a computer program / instructions stored thereon, which, when executed by a processor, implement the steps in the second or third aspect of embodiments of this application.

[0024] Ninthly, embodiments of this application provide a computer program product, including a computer program / instructions that, when executed by a processor, implement some or all of the steps described in the second or third aspects of embodiments of this application.

[0025] As can be seen, in this embodiment of the application, the power domain controller in the electric vehicle interacts with the battery execution and sampling unit in the power battery through the control system to disconnect the high voltage circuit of the power battery. The power domain controller discharges the voltage of the positive and negative busbars of the power battery by executing a discharge command, thereby reducing the risk of electric shock to relevant personnel and improving the electrical safety and stability of the high voltage circuit compared with the traditional method of setting a high voltage circuit breaker. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of a conventional high-voltage circuit breaker provided in an embodiment of this application;

[0028] Figure 2a This is a schematic diagram of the structure of a control system for safely cutting off the high-voltage circuit of a vehicle, provided in an embodiment of this application;

[0029] Figure 2b This is a circuit diagram of a discharge module provided in an embodiment of this application;

[0030] Figure 3 This is a schematic diagram of another control system for safely cutting off the high-voltage circuit of a vehicle provided in an embodiment of this application;

[0031] Figure 4 This is a flowchart illustrating a control method for safely disconnecting a vehicle's high-voltage circuit, as provided in an embodiment of this application.

[0032] Figure 5 This is a flowchart illustrating a control method for safely disconnecting a vehicle's high-voltage circuit, as provided in an embodiment of this application.

[0033] Figure 6a This is a functional unit block diagram of a control device for safely cutting off the high-voltage circuit of a vehicle, provided in an embodiment of this application.

[0034] Figure 6b This is a functional unit block diagram of another control device for safely cutting off the high-voltage circuit of a vehicle provided in an embodiment of this application;

[0035] Figure 7a This is a functional unit block diagram of a control device for safely cutting off the high-voltage circuit of a vehicle, provided in an embodiment of this application.

[0036] Figure 7b This is a functional unit block diagram of another control device for safely cutting off the high-voltage circuit of a vehicle provided in an embodiment of this application;

[0037] Figure 8 This is a structural block diagram of a controller provided in an embodiment of this application. Detailed Implementation

[0038] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present application.

[0039] The terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or apparatuses.

[0040] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0041] Based on this, the present application provides a control system for safely cutting off the high-voltage circuit of a vehicle. The embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0042] First, please refer to Figure 1 , Figure 1 This is a schematic diagram of a conventional high-voltage circuit breaker provided in an embodiment of this application. Figure 1The diagram shows the architecture used in the traditional method of disconnecting the high-voltage circuit, which involves adding a high-voltage circuit breaker to the high-voltage circuit and then disconnecting the high-voltage circuit breaker to disconnect the power battery, thereby ensuring the personal safety of relevant personnel. The connection relationships between the components inside the power battery 100 are as follows: the positive bus in the positive and negative busbars 105 is connected to the first end of the switch contact of the main contactor 101; the second end of the switch contact of the main contactor 101 is connected to the first end of the high-voltage circuit breaker 106; the second end of the high-voltage circuit breaker 106 is connected to the positive terminal of the battery module 103; the negative bus in the positive and negative busbars 105 is connected to the first end of the switch contact of the negative contactor 102; the negative terminal of the battery module 103 is connected to the second end of the switch contact of the negative contactor 102; and the first and second ends of the coil of the main contactor 101 are respectively connected to the input terminal of the battery actuating and supervising unit (BASU); the first and second ends of the coil of the negative contactor 102 are respectively connected to the output terminal of the battery actuating and supervising unit 104. While this architecture can disconnect the high-voltage circuit of the power battery 100, it has the following problems in practical applications: 1. The high-voltage circuit breaker has a limited number of uses; 2. It reduces the electrical insulation and airtightness of the power battery; 3. The high-voltage circuit breaker lacks overload and short-circuit protection functions, posing a risk of electric shock when the electrical load in an electric vehicle is high. Therefore, this application provides a control system, method, and vehicle for safely disconnecting the high-voltage circuit of a vehicle. This system, through the control of the power domain controller and the battery execution and sampling unit, ensures the disconnection of the high-voltage circuit in the power battery, thus eliminating the risk of electric shock and ensuring the safety of the electric vehicle and related personnel. Furthermore, by controlling the voltage discharge between the positive and negative busbars through the power domain controller, the safety of the electric vehicle and related personnel is further guaranteed, and the problems of the aforementioned traditional architecture are not present.

[0043] Specifically, please refer to Figure 2a , Figure 2a This is a schematic diagram of a control system for safely disconnecting the high-voltage circuit of a vehicle provided in an embodiment of this application. It includes: a power domain controller 303 and a battery execution and sampling unit 204. The power domain controller 303 is connected to the positive and negative busbars 205 of the power battery 200 through a built-in discharge module. The battery execution and sampling unit 204 is connected to the positive and negative busbars 205, and the positive and negative busbars 205 are respectively connected to the positive and negative terminals of the battery module 203.

[0044] The power domain controller 303 is used to send a high-voltage circuit cutoff command to the battery execution and sampling unit;

[0045] The battery execution and sampling unit 204 is used to respond to the high voltage circuit cut-off command and send a discharge command to the power domain controller 303 when the high voltage circuit in the power battery 200 is disconnected.

[0046] The power domain controller 303 is also used to respond to discharge commands and discharge the voltage between the positive and negative buses 205 through the discharge module.

[0047] In this design, the first detection terminal 301 of the power domain controller 303 is connected to the positive bus, and the second detection terminal 302 of the power domain controller 303 is connected to the negative bus. It should be noted that the power domain controller 303 and the battery execution and sampling unit 204 can be connected wirelessly or wired; this is not limited here. Wireless and wired connections are two different data transmission methods. Wired connections use physical cables or wires to connect devices for data transmission. This method typically offers advantages such as high stability, fast transmission speed, and strong anti-interference capabilities. Wireless connections use wireless transmission technologies such as radio waves or infrared rays for communication (i.e., data transmission). This method typically offers advantages such as high flexibility, high mobility, and low wiring costs. When choosing a connection method, the specific application scenario, requirements, and conditions must be considered to determine whether to use a wired or wireless connection.

[0048] The control system for safely cutting off the high-voltage circuit of the vehicle provided in this application is achieved through external control components (i.e., power battery 200) of the power battery 200. Figure 2a The power domain controller 303 controls the battery execution and sampling unit 204 to disconnect the high-voltage circuit of the power battery 200 based on the control signal (i.e., respond to the high-voltage circuit disconnection command), and on this basis, the power domain controller 303 executes the discharge command through the discharge module to reduce the risk of electric shock to relevant personnel.

[0049] Specifically, please refer to Figure 2b , Figure 2b This is a circuit diagram of a discharge module provided in an embodiment of this application. Figure 2b The circuit structure of a traditional bleeder module is shown. The bleeder module includes a first resistor R1, a first switch S1, a second switch S2, a third switch S3, a fourth switch S4, a fifth switch S5, a sixth switch S6, a power supply unit E, a DC charging port, a first capacitor C1, a second capacitor C2, a first switching transistor Q1, a second switching transistor Q2, a third switching transistor Q3, a fourth switching transistor Q4, a fifth switching transistor Q5, a sixth switching transistor Q6, a first motor inductor L1, a second motor inductor L2, a third motor inductor L3, and a voltmeter V.

[0050] The specific connection relationships of each component are as follows: the positive terminal of power supply unit E is connected to the first interface of the first resistor R1 and the first interface of the first switch S1; the second interface of the first resistor R1 is connected to the first interface of the second switch S2; the second interface of the second switch S2 is connected to the second interface of the first switch S1, the first interface of the first capacitor C1, the first interface of the first switch Q1, the first interface of the third switch Q3, the first interface of the fifth switch Q5, and the first interface of the fourth switch S4; the second interface of the first capacitor C1 is connected to the second interface of the second switch Q2, the second interface of the fourth switch Q4, and the second interface of the sixth switch Q6, which are connected to the first interface of the third switch S3; the second interface of the third switch S3 is connected to the negative terminal of power supply unit E; the second interface of the first switch Q1 is connected to the first interface of the second switch Q2, the first interface of the first resistor R1, the first interface of the first switch S1, the first interface of the first switch S2, the first interface of the first resistor R1, the first interface of the first switch S2, the first interface of the first switch S ... The first interface of the motor inductor L1 is connected; the second interface of the third switch Q3 is connected to the first interface of the fourth switch Q4 and the first interface of the second motor inductor L2; the second interface of the fifth switch Q5 is connected to the first interface of the sixth switch Q6 and the first interface of the third motor inductor L3; the second interface of the first motor inductor L1 is connected to the second interface of the second motor inductor L2 and the second interface of the third motor inductor L3 and the first interface of the fifth switch S5; the second interface of the fifth switch S5 is connected to the second interface of the fourth switch S4, the first interface of the second capacitor C2, the first interface of the voltmeter V, and the first port of the DC charging port; the second port of the DC charging port is connected to the first interface of the sixth switch S6; and the second interface of the sixth switch S6 is connected to the second interface of the voltmeter V, the second interface of the second capacitor C2, and the second interface of the sixth switch.

[0051] Specifically, the first capacitor C1 is the bus capacitor. When the first capacitor C1 needs to be discharged, the first switch S1 (i.e., the main contactor) and the third switch S3 (the negative contactor) are disconnected. At this time, the first capacitor C1 still has voltage because it has not been discharged, and a discharge operation is required. At this time, the first switch Q1 and the fourth switch Q4 are turned on, forming a first circuit to dissipate electrical energy as heat through the first motor inductor L1 and the second motor inductor L2. The first circuit is specifically: first capacitor C1 → first switch Q1 → first motor inductor L1 → first motor inductor L2 → fourth switch Q4 → first capacitor C1. Afterwards, the third switch Q3 and the sixth switch Q6 are turned on, forming a second circuit to dissipate electrical energy as heat through the second motor inductor L2 and the third motor inductor L3. The second circuit is specifically: first capacitor C1 → third switch Q3 → second motor inductor L2 → third motor inductor L3 → sixth switch Q6 → first capacitor C1. Subsequently, the second switch Q2 and the fifth switch Q5 are turned on to form a third circuit. Through the first motor inductor L1 and the third motor inductor L3, electrical energy is dissipated as heat. Specifically, the third circuit is: first capacitor C1 → fifth switch Q5 → third motor inductor L3 → first motor inductor L1 → second switch Q2 → first capacitor C1. The control principle lies in controlling the first switch Q1 or the fourth switch Q4, the third switch Q3 or the sixth switch Q6, and the second switch Q2 or the fifth switch Q5 in staggered phases to achieve energy discharge from the first capacitor C1 (i.e., the bus capacitor).

[0052] It is important to note that traditional discharge modules only perform discharge operations when the electric vehicle is de-energized, which is a passive process. In contrast, this application utilizes a power domain controller 303 to actively discharge during the electric vehicle maintenance process, ensuring personnel safety. Even if the vehicle is not de-energized, the power domain controller 303 can control the motor discharge by controlling the phase reversal of the switching transistors. That is, by adding an extra switch, the process is triggered to actively discharge the voltage between the positive and negative busbars 205 of the power battery 200. Furthermore, based on the safety disconnection control system for the vehicle's high-voltage circuit provided in this application, compared to the traditional de-energization discharge process where personnel cannot perceive the discharge status, this application, through the power domain controller 303's detection of the busbar voltage and subsequent interaction with the vehicle's body controller and display module, can display the discharge status and inform the personnel. This ensures that personnel can take appropriate subsequent actions based on the specific discharge status, guaranteeing both personnel and vehicle safety.

[0053] The control system, method, and vehicle for safely disconnecting the high-voltage circuit of a vehicle provided in this application are applicable to all scenarios where the high-voltage circuit of the power battery in an electric vehicle needs to be disconnected. Specific scenarios requiring the disconnection of the high-voltage circuit include, but are not limited to: 1. Accident or Collision: In the event of an accident or collision, the high-voltage circuit of the electric vehicle may be automatically disconnected to prevent the high voltage in the vehicle system from threatening the safety of passengers and rescue personnel. This helps reduce the risk of electric shock and prevent fires or other hazards. 2. Vehicle Repair or Maintenance: During the repair, inspection, or maintenance of an electric vehicle, the high-voltage circuit usually needs to be disconnected to ensure the safety of repair personnel. This prevents electric shock accidents and reduces the safety risks to repair personnel. 3. Battery Replacement: When it is necessary to replace the high-voltage battery in an electric vehicle, the high-voltage circuit must be disconnected first. This ensures that no high-voltage power supply poses a danger to repair personnel or other personnel during the replacement process. 4. Abnormal Situations: When an abnormal situation is detected in the electric vehicle, such as battery overheating, battery malfunction, or other system failure, the high-voltage circuit may be disconnected to avoid further damage or safety risks. 5. Emergency Situations: In other emergency situations, such as system failure, battery failure, or drive system malfunction, the high-voltage circuit may be disconnected to protect passengers and the vehicle and prevent further damage or accidents. In summary, disconnecting the high-voltage circuit in these situations is to ensure the safety of the vehicle and passengers and prevent potential dangerous events. Therefore, electric vehicles are typically designed with relevant safety systems and protection mechanisms to automatically or manually disconnect the high-voltage circuit when needed. Furthermore, the control system and method for safely disconnecting the vehicle's high-voltage circuit provided in this application are applicable to the high-voltage circuit corresponding to the power battery. Therefore, it is understood that in addition to the power battery in an electric vehicle being suitable for the control system and method for safely disconnecting the vehicle's high-voltage circuit, other high-voltage power supply circuits using power batteries are also applicable and achieve the same effect, realizing the safe disconnection of the high-voltage circuit and ensuring the personal safety of relevant personnel.

[0054] Specifically, the connection relationships between the components inside the power battery 200 are as follows: the positive busbar is connected to the first end of the switch contact of the main contactor 201, the second end of the switch contact of the main contactor 201 is connected to the positive terminal of the battery module 203, the negative busbar is connected to the first end of the switch contact of the negative contactor 202, and the negative terminal of the battery module 203 is connected to the second end of the switch contact of the negative contactor 202; and the first and second ends of the coil of the main contactor 201 are respectively connected to the input terminal of the battery execution and sampling unit 204, and the first and second ends of the coil of the negative contactor 202 are respectively connected to the output terminal of the battery execution and sampling unit 204.

[0055] Specifically, the principle of the power domain controller 303 executing the discharge command is that after the high voltage circuit of the power battery 200 is disconnected, there may still be high voltage between the positive bus and the negative bus. It is necessary to use a three-phase motor to consume the electrical energy so that the electrical energy on the bus approaches zero. That is, the work of the motor and other equipment is used to actively consume the charge, thereby reducing the bus voltage to a safe charge.

[0056] Furthermore, the power domain controller 303 is connected to the positive bus of the power battery 200 via a first detection terminal 301 and to the negative bus of the power battery 200 via a second detection terminal 302, thereby enabling the detection of the bus voltage between the positive and negative buses of the power battery 200. Additionally, the power domain controller 303 communicates with the battery execution and sampling unit 204 via a CAN signal (Controller Area Network). The CAN signal is transmitted via twisted-pair cable and supports real-time communication between multiple control modules, allowing them to work collaboratively to control various aspects of the vehicle. This communication method enables various systems in the vehicle, such as the engine control unit, braking system, and sensors, to exchange information for more efficient and safer vehicle operation, providing a reliable real-time communication mechanism and supporting collaborative work between multiple control units. In other embodiments, the power domain controller 303 and the battery execution and sampling unit 204 can also communicate via other signals, including but not limited to wired communication methods such as local area networks, Ethernet, and serial communication protocols, or wireless communication methods such as Bluetooth, cellular networks, RFID, and near-field communication.

[0057] Please refer to the following: Figure 3 , Figure 3 This is a schematic diagram of another control system for cutting off the high-voltage circuit of a vehicle provided in this application embodiment, compared to... Figure 2a The control system shown is a safety disconnection system for the vehicle's high-voltage circuit. Figure 3 The control system shown is more comprehensive in its modules. The connection relationships and functions between the modules are described in detail below with reference to various embodiments.

[0058] In one possible embodiment, the control system for safely disconnecting the vehicle's high-voltage circuit further includes: a low-voltage mode switch 410; the low-voltage mode switch 410 is used to send a trigger signal to the power domain controller 303 when a switch trigger operation is detected, the trigger signal being used to instruct the power domain controller 303 to send a high-voltage circuit disconnect command to the battery execution and sampling unit 204.

[0059] Among them, such as Figure 3As shown, the low-voltage mode switch 410 is connected to the power domain controller 303 via a wired or wireless connection. When the low-voltage mode switch 410 detects an external switch trigger operation, it sends a trigger signal to the power domain controller 303. Then, the power domain controller 303 sends a high-voltage circuit cutoff command to the battery execution and sampling unit 204 to cut off the high-voltage circuit of the electric vehicle's power battery 200.

[0060] Specifically, the low-voltage mode switch 410 sends a trigger signal to the power domain controller 303 via a hard-wired signal. A hard-wired signal typically refers to an electronic signal transmitted through a physical cable (hard wire), a signal transmission method that uses a fixed hard wire to connect the controller and electronic components, primarily used in automotive electronic systems. It can control and monitor various parameters in the system, such as temperature sensors, pressure sensors, and accelerator pedal position sensors. The advantages of hard-wired signals include fast transmission speed, stable transmission, and lower installation and maintenance costs. In other embodiments, the low-voltage mode switch 410 can also send a trigger signal to the power domain controller 303 via Bluetooth signals, wireless sensor signals, wireless remote control signals, etc.

[0061] As can be seen in this example, compared to Figure 1 By placing the high-voltage circuit breaker in the high-voltage circuit, this application places the low-voltage mode switch outside the power battery to avoid affecting the airtightness of the power battery.

[0062] In one possible embodiment, such as Figure 3 As shown, the first detection terminal 301 and the second detection terminal 302 of the power domain controller 303 are respectively connected to the positive and negative busbars 205;

[0063] The power domain controller 303 is also used to: after executing a discharge command, instruct the vehicle's body controller 420 to remind the user of the high-voltage circuit status through at least one notification method, the high-voltage circuit status being determined by the bus voltage between the positive and negative buses 205 detected by the first detection terminal 301 and the second detection terminal 302.

[0064] The Body Control Module (BCM) 420 is an electronic control unit in the vehicle responsible for managing and controlling various electrical and electronic systems related to the vehicle body. Specifically, in this control system, it is used to notify the user of the bus voltage between the positive and negative buses 205 through at least one notification method. The connection between the power domain controller 303 and the body control module 420 can be wired or wireless.

[0065] Furthermore, the control system may also include a display module 430. The body controller 420 can control the display of the display module 430. The connection between the body controller 420 and the display module 430 can be wired or wireless. The display module 430 can notify the user by displaying an indicator light on the electric vehicle's dashboard to indicate the status of the corresponding high-voltage circuit, or by displaying or broadcasting a message on the vehicle's display screen to alert relevant personnel or the driver to the vehicle's current status; this is not limited here. Additionally, the body controller 420 can also emit a specific sound effect through a speaker to indicate whether the discharge between the positive and negative buses 205 is complete or incomplete; or, it can send a preset message to the user's terminal device via the vehicle's communication module to notify them of the discharge.

[0066] In one possible embodiment, when the bus voltage indicates that the discharge between the positive and negative busbars 205 is complete, the high-voltage circuit status indicates that the high-voltage circuit has been successfully disconnected; when the bus voltage indicates that the discharge between the positive and negative busbars 205 is incomplete, the high-voltage circuit status indicates that the high-voltage circuit has failed to be disconnected.

[0067] Furthermore, regarding the determination of discharge based on the voltage between the positive and negative buses 205 detected by the first detection terminal 301 and the second detection terminal 302, the power domain controller 303 is specifically configured to: determine that discharge is incomplete if the bus voltage (i.e., the voltage between the positive and negative buses 205) exceeds a preset voltage; and determine that discharge is complete if the bus voltage is less than or equal to the preset voltage. The preset voltage is less than or equal to 60 volts because when the voltage on the bus is less than 60 volts, there is no risk of electric shock to personnel. 60 volts is a standard-defined safe voltage, representing a level of safety for the human body.

[0068] Specifically, the power domain controller 303 and the body controller 420, as well as the body controller 420 and the display module 430, transmit signals via CAN signals to perform corresponding operations.

[0069] As can be seen, in this example, by combining the discharge operation of the power domain controller with the function of the body controller and display module to provide prompts based on the actual high-voltage status of the vehicle, it is possible to effectively prevent personnel from being electrocuted due to the inability to disconnect the high voltage when the vehicle contactor fails. This improves the flexibility of the control system and, compared to... Figure 1 The high-voltage circuit breaker connection shown in this application indicates that the control system not only achieves the function of safely cutting off the high-voltage circuit of the vehicle, but also reduces the risk of electric shock by using the vehicle's existing modules to alert relevant personnel to the current high-voltage status of the vehicle without increasing costs.

[0070] In one possible embodiment, the battery execution and sampling unit 204 is further configured to: before sending a discharge command to the power domain controller 303, instruct the body controller 420 to remind the user of vehicle status information through at least one notification method. The vehicle status information includes one or more of the following: the sintering state of the main contactor 201 and the negative contactor 202, and the vehicle leakage state. The battery execution and sampling unit 204 can also perform the reminder operation through the body controller 420. Since the battery execution and sampling unit 204 needs to perform the activation of the low-voltage circuit mode, and the specific conditions of vehicle components during the activation process (such as the sintering state of the main contactor 201 and the negative contactor 202, and the vehicle leakage state) are varied, to ensure that relevant personnel are aware of the specific status, the body controller 420 can be instructed to remind relevant personnel through at least one notification method. The notification methods may include: sending vehicle status information to the display module 430, which indicates the current voltage status of the vehicle. For example, if the main contactor 201 and the negative contactor 202 are sintered, a vehicle leakage indicates a high voltage status, and vice versa. Alternatively, the vehicle's communication module may send a reminder message to associated terminal equipment. Relevant personnel can then pay attention to the vehicle status based on the displayed information and take additional high-voltage safety measures to prevent electric shock due to the inability to disconnect the high voltage when the vehicle contactor malfunctions, thus improving the safety and reliability of the control system.

[0071] In one possible embodiment, the battery execution and sampling unit 204 is further configured to send a work disallowed command to the battery module 203 and / or one or more high-voltage working modules of the vehicle after receiving a high-voltage circuit cut-off command, so as to stop the battery module 203 and / or one or more high-voltage working modules from working.

[0072] The high-voltage operating modules can include modules requiring high-voltage operation, such as the air conditioning module and the high-voltage DC to low-voltage DC conversion module, etc., without limitation here. Taking the air conditioning module and the high-voltage DC to low-voltage DC conversion module as examples, when the battery execution and sampling unit 204 receives the high-voltage circuit cutoff command, in addition to disconnecting the main contactor 201 and the negative contactor 202 in the power battery 200, it will also send an operation disallowed command to the associated modules in the control system (i.e., the air conditioning module, the battery module 203, and the high-voltage DC to low-voltage DC conversion module) to indicate that the electric vehicle is currently in low-voltage circuit mode, i.e., in a low-voltage state and does not support high-voltage operation. Specifically, the operation disallowed command sent by the battery execution and sampling unit 204 to different associated modules is also different, including sending a discharge disallowed command to the battery module, an air conditioning operation disallowed command to the air conditioning module, and an operation disallowed command to the high-voltage DC to low-voltage DC conversion module. The battery execution and sampling unit 204 will continue to send operation disallowed commands until it responds to the command sent by the power domain controller to exit the low-voltage circuit mode.

[0073] As can be seen, in this example, in addition to simply disconnecting the contactor in the high-voltage circuit, the battery execution and sampling unit also controls the associated module not to perform high-voltage work, so as to avoid the associated module repeatedly sending instructions to the power battery to request power.

[0074] In one possible embodiment, the power battery 200 further includes a main contactor 201 and a negative contactor 202. The positive and negative busbars 205 are connected to the positive and negative terminals of the battery module 203 through the main contactor 201 and the negative contactor 202, respectively. The battery execution and sampling unit 204 is connected to the positive and negative busbars 205 through the main contactor 201 and the negative contactor 202. If both the main contactor 201 and the negative contactor 202 are in the open state, the high-voltage circuit formed by the battery module 203 and the positive and negative busbars 205 is disconnected. The battery execution and sampling unit is also used to: after receiving the high-voltage circuit disconnection command, if the main contactor 201 and / or the negative contactor 202 are in the closed state, disconnect the main contactor 201 and / or the negative contactor 202.

[0075] In order to accurately determine whether the high-voltage circuit of the power battery 200 is disconnected, the battery execution and sampling unit 204 determines whether the main contactor 210 and the negative contactor 202 are in the open state. First, before disconnection, the battery execution and sampling unit 204 acquires the switching status of the contactors. If both are in the open state, it determines that the high-voltage circuit is disconnected; if the main contactor 201 and / or the negative contactor 202 are in the closed state, it controls the main contactor 201 and / or the negative contactor 202 to open, thereby disconnecting the high-voltage circuit in the power battery 200.

[0076] As can be seen in this example, the battery execution and sampling unit first obtains the switch state of the contactor, and then determines whether to control the contactor to disconnect, so as to ensure the correct disconnection of the main contactor and the negative contactor, thereby improving the safety of the electric vehicle.

[0077] In one possible embodiment, the power domain controller 303 is further configured to: wake up the body controller 420 and / or the battery execution and sampling unit 204 if the body controller 420 and / or the battery execution and sampling unit 204 is in a sleep state before sending a high-voltage circuit cutoff command to the battery execution and sampling unit 204.

[0078] The specific method for waking up the body controller 420 and / or the battery execution and sampling unit 204 can be network wake-up, which is not limited here.

[0079] When the low-voltage mode switch 410 is triggered, the body controller and the battery execution and sampling unit are either in a sleep state or in a wake-up state. Therefore, different steps are required for different states. When the body controller and the battery execution and sampling unit are in a sleep state, a network wake-up operation is required to wake up the corresponding modules in order to perform subsequent operations. Furthermore, when the electric vehicle is in a sleep state, it indicates that all modules within the electric vehicle are also in a sleep state. Therefore, when the electric vehicle is detected to be in a sleep state, it can be determined that the body controller and the battery execution and sampling unit are also in a sleep state.

[0080] As can be seen in this example, when the low-voltage mode switch 410 is triggered, the power domain controller will perform additional operations depending on the different states of the electric vehicle, so that the subsequent low-voltage circuit mode opening operation can be executed normally, thereby improving the stability of the control system in realizing the function of safely cutting off the high-voltage circuit of the vehicle.

[0081] In one possible embodiment, the display module 430 includes meters and / or multimedia.

[0082] The instrument panel refers to the vehicle's dashboard, a device used to reflect the operating status of various vehicle systems. Common instruments include fuel indicator lights, washer fluid indicator lights, electronic throttle indicator lights, front and rear fog light indicator lights, and warning lights. The instruments vary between different cars. However, standard automotive instruments typically include a speedometer, tachometer, oil pressure gauge, coolant temperature gauge, fuel gauge, and charging indicator. This application addresses the existence of high-voltage circuit disconnection success, high-voltage circuit disconnection failure, high-voltage status, and low-voltage status; therefore, indicator lights can be added to the instrument panel to indicate the corresponding status, thus providing relevant personnel with information about the current vehicle condition.

[0083] A vehicle multimedia system is an electronic system integrated into a car, designed to provide a wealth of infotainment and functionality. These systems typically include multiple screens, audio equipment, connectivity options, and other features to offer a more enjoyable and convenient driving experience. Specifically, this includes: A central control screen: Multimedia systems usually feature a central control screen to display navigation maps, audio information, vehicle settings, and other relevant information. These screens can be touchscreens or operated via buttons inside the vehicle. An audio system: This includes a radio, CD / DVD player, Bluetooth connectivity, USB ports, and audio input options. Some vehicle multimedia systems support advanced audio settings such as audio balance, equalizers, and sound enhancements.

[0084] As can be seen, in this example, the display module displays the vehicle status fed back by the battery execution and sampling unit 204 and the power domain controller in various ways. The specific hardware aspects are implemented through instruments and / or multimedia, which improves the diversity and flexibility of the control system in indicating the vehicle status.

[0085] visible, Figure 3 This application provides a control system for safely disconnecting a vehicle's high-voltage circuit. Compared to traditional high-voltage circuit disconnection control that requires adding a high-voltage circuit breaker, it reuses the detection and control circuits of the electric vehicle's high-voltage components, thus not increasing costs, while still achieving the function of safely disconnecting the vehicle's high-voltage circuit. Furthermore, the control system provided by this application can provide alerts based on the actual high-voltage status of the vehicle, preventing electric shock to personnel due to the inability to disconnect the high-voltage circuit in case of a contactor malfunction. It also eliminates the need for an additional circuit breaker in series in the high-voltage circuit, avoiding the reduction of electrical safety of the power battery due to the addition of a circuit breaker in the power battery, and offers high flexibility in control methods.

[0086] The following are embodiments of the method of this application. Based on this, the embodiments of this application provide a control method for safely disconnecting the high-voltage circuit of a vehicle. The embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0087] Please refer to the figure. Figure 4 This is a flowchart illustrating a control method for safely disconnecting a vehicle's high-voltage circuit, provided in an embodiment of this application. The method is applied to a battery execution and sampling unit 204 in a power battery 200 within a control system. The vehicle also includes a power domain controller 303 corresponding to the power battery 200. The power domain controller 303 is connected to the positive and negative busbars 205 of the power battery 200 via a discharge module. The battery execution and sampling unit 204 is connected to the positive and negative busbars 205, which are respectively connected to the positive and negative terminals of the battery module 203 in the power battery 200. The method includes:

[0088] Step S401: Receive the high-voltage circuit cut-off command sent by the power domain controller 303;

[0089] In step S402, in response to the high-voltage circuit disconnection command, when the high-voltage circuit in the power battery 200 is disconnected, a discharge command is sent to the power domain controller 303 so that the power domain controller 303 discharges the voltage between the positive and negative busbars 205 through the discharge module.

[0090] Upon receiving a high-voltage circuit disconnection command from the power domain controller 303, the battery execution and sampling unit 204 responds to the command by disconnecting the high-voltage circuit in the power battery 200. Furthermore, when the high-voltage circuit in the power battery 200 is disconnected, a discharge command is sent to the power domain controller 303 to discharge the output voltage of the power battery 200 (i.e., the bus voltage between the positive and negative busbars 205), thereby reducing the risk of electric shock to personnel. Specifically, the principle behind the power domain controller 303 executing the discharge command is that even after the high-voltage circuit of the power battery 200 is disconnected, high voltage may still exist between the positive and negative busbars. This requires the use of a three-phase motor to consume electrical energy, bringing the electrical energy on the busbars closer to zero. In other words, the operation of the motor and other equipment actively consumes the charge, thereby reducing the busbar voltage to a safe level.

[0091] In one possible embodiment, responding to a high-voltage circuit disconnect command includes sending an operation disallow command to the battery module 203 and / or one or more high-voltage operating modules of the vehicle to cause the battery module 203 and / or one or more high-voltage operating modules to stop operating.

[0092] The high-voltage working module may include an air conditioning module and a high-voltage DC to low-voltage DC conversion module, which are not limited here.

[0093] When the battery execution and sampling unit 204 receives a high-voltage circuit cutoff command, in addition to disconnecting the main contactor 201 and negative contactor 202 in the power battery 200, it can also send a work-disallowed command to the associated modules in the control system (i.e., the air conditioning module, the battery module 203, and the high-voltage DC to low-voltage DC conversion module) to indicate that the electric vehicle is currently in a high-voltage circuit cutoff state, i.e., in a low-voltage state, and does not support high-voltage operation. Specifically, the work-disallowed commands sent by the battery execution and sampling unit 204 to different associated modules are also different. Specifically, the battery execution and sampling unit 204 sends a discharge-disallowed command to the battery module 203, an air conditioning-disallowed command to the air conditioning module, and a work-disallowed command to the high-voltage DC to low-voltage DC conversion module. The battery execution and sampling unit 204 will continue to send work-disallowed commands until it responds to the command sent by the power domain controller 303 to exit the high-voltage circuit cutoff state.

[0094] As can be seen, in this example, in addition to simply disconnecting the contactor in the high-voltage circuit, the battery execution and sampling unit also controls the associated module not to perform high-voltage work, so as to avoid the associated module repeatedly sending instructions to the power battery to request power.

[0095] In one possible embodiment, the power battery 200 further includes a main contactor 201 and a negative contactor 202. The positive and negative busbars 205 are connected to the positive and negative terminals of the battery module 203 through the main contactor 201 and the negative contactor 202, respectively. The battery execution and sampling unit 204 is connected to the positive and negative busbars 205 through the main contactor 201 and the negative contactor 202. If both the main contactor 201 and the negative contactor 202 are in the open state, the high-voltage circuit formed by the battery module 203 and the positive and negative busbars 205 is disconnected. The method further includes: after receiving the high-voltage circuit disconnection command, if the main contactor 201 and / or the negative contactor 202 are in the closed state, then disconnect the main contactor 201 and / or the negative contactor 202.

[0096] In order to accurately determine whether the high-voltage circuit of the power battery 200 is disconnected, the battery execution and sampling unit 204 determines whether the main contactor 201 and the negative contactor 202 are in the open state. First, before disconnection, the battery execution and sampling unit 204 acquires the switching status of the contactors. If both are in the open state, it determines that the high-voltage circuit is disconnected; if the main contactor 201 and / or the negative contactor 202 are in the closed state, it controls the main contactor 201 and / or the negative contactor 202 to open, thereby disconnecting the high-voltage circuit in the power battery 200.

[0097] As can be seen, in this example, the battery execution and sampling unit 204 first obtains the switching state of the contactor, and then determines whether to control the contactor to disconnect, so as to ensure the correct disconnection of the main contactor 201 and the negative contactor 202, thereby improving the safety of the electric vehicle.

[0098] In one possible embodiment, the control system further includes a body controller 420 and a display module 430; before sending a discharge command to the power domain controller 303 to discharge the voltage between the positive and negative buses 205, the method further includes: instructing the body controller 420 to remind the user of vehicle status information through at least one notification method, the vehicle status information including one or more of the sintering status of the main contactor 201, the negative contactor 202, and the vehicle leakage status.

[0099] The battery execution and sampling unit 204 displays vehicle status information through interaction between the body controller 420 and the display module 430 in the control system. Since the battery execution and sampling unit 204 needs to initiate the high-voltage circuit cutoff state, and the actual situation during this process (such as the sintering state of the main contactor 201 and negative contactor 202, and vehicle leakage status) is complex and variable, the battery execution and sampling unit 204 subsequently sends vehicle status information to the display module 430 to indicate the vehicle's current status so that relevant personnel can understand the specific status and make accurate and safe judgments. The vehicle status information displayed by the display module 430 indicates the vehicle's current voltage status. For example, if the main contactor 201 and negative contactor 202 are sintered, and the vehicle is leaking electricity, it indicates a high-voltage state; conversely, if they are not sintered, the vehicle's current voltage status is low-voltage. Relevant personnel can pay attention to the vehicle status based on the displayed information and take additional high-voltage safety measures.

[0100] As can be seen, in this example, after the battery execution and sampling unit 204 completes the high-voltage circuit disconnection state opening, it will provide feedback on the specific opening status. It can provide prompts based on the actual high-voltage status of the vehicle, preventing relevant personnel from being electrocuted due to the inability to disconnect the high voltage when the vehicle contactor fails, thereby improving the safety and reliability of the control system.

[0101] visible, Figure 4 This is a flowchart illustrating a control method for safely disconnecting a vehicle's high-voltage circuit, provided in an embodiment of this application. It is applied to the battery execution and sampling unit in the power battery of the control system. By interacting with the power domain controller in the control system, it performs a disconnection operation on the high-voltage circuit of the power battery. After the high-voltage circuit is disconnected, the power domain controller discharges the remaining charge in the circuit, thereby improving the safety and stability of the control system and effectively reducing the risk of electric shock to relevant personnel.

[0102] Please see Figure 5 , Figure 5 This is a flowchart illustrating a control method for safely disconnecting a vehicle's high-voltage circuit, provided in an embodiment of this application. It is applied to a power domain controller 303 corresponding to the vehicle's power battery 200. The vehicle also includes a battery execution and sampling unit 204 corresponding to the power battery 200. The power domain controller 303 is connected to the positive and negative busbars 205 of the power battery 200 via a discharge module. The battery execution and sampling unit 204 is connected to the positive and negative busbars 205, which are respectively connected to the positive and negative terminals of the battery module 203 in the power battery 200. The method includes:

[0103] Step S501: Send a high-voltage circuit cut-off command to the battery execution and sampling unit 204;

[0104] In step S502, upon receiving the discharge command sent by the battery execution and sampling unit 204 in response to the high voltage circuit cutoff command, the voltage between the positive and negative busbars 205 is discharged through the discharge module in response to the discharge command.

[0105] Specifically, the principle of the power domain controller 303 executing the discharge command is that after the high-voltage circuit of the power battery 200 is disconnected, there may still be high voltage between the positive and negative busbars. It is necessary to use a three-phase motor to consume the electrical energy so that the electrical energy on the busbar approaches zero. That is, the charge is actively consumed by the operation of the motor and other equipment, thereby reducing the busbar voltage to a safe charge. In one possible embodiment, the control system also includes a body controller 420; the method also includes: after executing the discharge command, instructing the vehicle's body controller 420 to remind the user of the high-voltage circuit status through at least one notification method. The high-voltage circuit status is determined by the busbar voltage between the positive and negative busbars 205 after discharge, detected by the first detection terminal 301 and the second detection terminal 302.

[0106] Furthermore, in one possible embodiment, when the bus voltage indicates that the discharge between the positive and negative busbars 205 is complete, the high-voltage circuit status indicates that the high-voltage circuit has been successfully disconnected; when the bus voltage indicates that the discharge between the positive and negative busbars 205 is not complete, the high-voltage circuit status indicates that the high-voltage circuit has failed to be disconnected.

[0107] As can be seen, in this example, the combination of the power domain controller 303 executing the discharge command and the body controller 420 providing prompts based on the actual high-voltage status of the vehicle can effectively prevent personnel from being electrocuted due to the inability to disconnect the high voltage when the vehicle contactor fails. This improves the flexibility of the control system in opening the high-voltage circuit disconnection state and avoids the risk of electric shock to relevant personnel.

[0108] In one possible embodiment, the first detection terminal 301 and the second detection terminal 302 of the power domain controller 303 are respectively connected to the positive and negative buses 205; the method further includes: instructing the body controller 420 to remind the user of the bus voltage between the positive and negative buses 205 through at least one notification method.

[0109] The control system also includes a display module 430. At least one notification method includes: sending the high-voltage circuit status to the display module 430 to display the high-voltage circuit status to the user. Specifically, this could be displaying an indicator light on the electric vehicle's dashboard to indicate the corresponding high-voltage circuit status, or displaying it on the vehicle's screen or through voice announcement to alert relevant personnel or the driver to the vehicle's current status; this is not limited here. Alternatively, a specific sound effect could be emitted through a speaker to indicate whether the discharge between the positive and negative buses 205 is complete or incomplete; or, a preset message could be sent to the user's terminal device via the vehicle's communication module to notify them of the discharge.

[0110] In addition to displaying whether the high-voltage circuit was successfully disconnected, the display module 430 can also be used to specifically display the voltage between the positive and negative busbars 205, allowing relevant personnel to accurately determine whether the high-voltage circuit of the power battery 200 was successfully disconnected, effectively reducing the risk of electric shock.

[0111] As can be seen in this example, the power domain controller 303 in the controller can also control the display module 430 to display the voltage detected by the detection loop, thereby improving the flexibility of the control system in providing voltage prompts.

[0112] In one possible embodiment, detecting the bus voltage between the positive and negative busbars 205 after discharge to determine the discharge status includes: if the bus voltage is less than a preset voltage, then the discharge between the positive and negative busbars 205 is complete; if the bus voltage is greater than or equal to the preset voltage, then the discharge between the positive and negative busbars 205 is not complete.

[0113] The preset voltage should be less than or equal to 60 volts, because when the voltage on the bus is less than 60 volts, there will be no risk of electric shock to the relevant personnel.

[0114] As can be seen, in this example, by setting a preset voltage and determining whether the discharge is complete or incomplete, it can be ensured that the output voltage of the power battery 200 when the discharge is complete is lower than the upper limit of voltage that the relevant personnel can withstand, that is, the voltage level that will not harm the relevant personnel's body, thereby ensuring the stability and safety of the control system entering the high-voltage circuit cut-off state.

[0115] In one possible embodiment, before sending a high-voltage circuit cutoff command to the battery execution and sampling unit 204, the method further includes: waking up the body controller 420 and / or the battery execution and sampling unit 204 if it is detected that the body controller 420 and / or the battery execution and sampling unit 204 is in a sleep state.

[0116] When the low-voltage mode switch 410 is triggered, the body controller 420 and the battery execution and sampling unit 204 are either in a sleep state or in a wake-up state. Therefore, different steps are required for different states. When the body controller 420 and the battery execution and sampling unit 204 are in a sleep state, the corresponding modules can be woken up by performing a network wake-up operation to perform subsequent operations. In addition, when the electric vehicle is in a sleep state, it means that all modules in the electric vehicle are also in a sleep state. Therefore, when the electric vehicle is detected to be in a sleep state, it can be determined that the body controller 420 and the battery execution and sampling unit 204 are in a sleep state.

[0117] As can be seen in this example, when the low-voltage mode switch is triggered, the power domain controller will perform additional operations depending on the different states of the electric vehicle, so that the subsequent high-voltage circuit disconnection state opening operation can be executed normally, thereby improving the stability of the control system in realizing the function of safely disconnecting the vehicle's high-voltage circuit.

[0118] visible, Figure 5 This is a flowchart illustrating a control method for safely disconnecting a vehicle's high-voltage circuit, provided in an embodiment of this application. Applied to the power domain controller 303 in the control system, it interacts with the battery execution and sampling unit 204 in the power battery 200 to perform a disconnection operation on the high-voltage circuit of the power battery 200. After determining that the high-voltage circuit is disconnected, the power domain controller 303 also discharges the remaining charge in the circuit to ensure that the output voltage of the power battery 200 is below the upper limit of the safe withstand voltage, thereby improving the safety and stability of the control system and effectively reducing the risk of electric shock to relevant personnel.

[0119] The following are embodiments of the apparatus of this application. These embodiments of the apparatus and the embodiments of the method of this application belong to the same concept and are used to execute the methods described in the embodiments of this application. For ease of explanation, only the parts related to the apparatus embodiments of this application are shown in the embodiments of this application. For specific technical details not disclosed, please refer to the description of the embodiments of the method of this application, which will not be repeated here.

[0120] This application provides a control device for safely disconnecting a vehicle's high-voltage circuit. This control device for safely disconnecting a vehicle's high-voltage circuit is applied to... Figure 2a The battery execution and sampling unit 204 in the control system shown. Specifically, the control device for safely disconnecting the vehicle's high-voltage circuit is used to perform actions such as... Figure 4 The steps performed by the battery execution and sampling unit 204 in the control method for safely cutting off the high-voltage circuit of a vehicle, as shown in the illustration, are described. The control device for safely cutting off the high-voltage circuit of a vehicle provided in this application embodiment may include modules corresponding to the respective steps.

[0121] This application embodiment can divide the control device for safely disconnecting the high-voltage circuit of a vehicle into functional modules based on the above method example. For example, each function can be divided into its own functional module, or two or more functions can be integrated into one processing module. The integrated module can be implemented in hardware or as a software functional module. The module division in this application embodiment is illustrative and only represents one logical functional division; other division methods may be used in actual implementation.

[0122] When dividing each function into modules according to its corresponding function. Figure 6aThis is a functional unit block diagram of a control device for safely cutting off the high-voltage circuit of a vehicle, provided in an embodiment of this application. The control device 60 for safely cutting off the high-voltage circuit of a vehicle is applied to the battery execution and sampling unit 204 corresponding to the power battery 200. The vehicle is also equipped with a power domain controller 303 corresponding to the power battery 200. The power domain controller 303 is connected to the positive and negative busbars 205 of the power battery 200 through a discharge module. The battery execution and sampling unit 204 is connected to the positive and negative busbars 205, and the positive and negative busbars 205 are respectively connected to the positive and negative terminals of the battery module 203 in the power battery 200. The device includes: a receiving unit 601, used to receive a high-voltage circuit cutting-off command sent by the power domain controller 303; and a response unit 602, used to respond to the high-voltage circuit cutting-off command and send a discharge command to the power domain controller 303 when the high-voltage circuit in the power battery 200 is disconnected, so that the power domain controller 303 discharges the voltage between the positive and negative busbars 205 through the discharge module.

[0123] In one possible embodiment, the response unit 602 is specifically configured to: send a work disallow command to the battery module 203 and / or one or more high-voltage operating modules of the vehicle to cause the battery module 203 and / or the one or more high-voltage operating modules to stop operating.

[0124] In one possible embodiment, the power battery 200 further includes a main contactor 201 and a negative contactor 202. The positive and negative busbars 205 are connected to the positive and negative terminals of the battery module 203 through the main contactor 201 and the negative contactor 202, respectively. The battery execution and sampling unit 204 is connected to the positive and negative busbars 205 through the main contactor 201 and the negative contactor 202. If both the main contactor 201 and the negative contactor 202 are in the open state, the high-voltage circuit formed by the battery module 203 and the positive and negative busbars 205 is disconnected. The response unit 602 is further configured to: after receiving the high-voltage circuit disconnection command, if the main contactor 201 and / or the negative contactor 202 are in the closed state, disconnect the main contactor 201 and / or the negative contactor 202.

[0125] In one possible embodiment, before sending a discharge command to the power domain controller 303 to discharge the voltage between the positive and negative buses 205, the response unit 602 is further configured to: instruct the body controller 420 to remind the user of vehicle status information through at least one notification method so that the display module displays the vehicle status information, which includes one or more of the sintering status of the main contactor 201 and the negative contactor 202 and the vehicle leakage status.

[0126] When using integrated units, such as Figure 6b As shown, Figure 6b This is a functional unit block diagram of another control device for safely cutting off the high-voltage circuit of a vehicle, provided in an embodiment of this application. Figure 6b The control device 61 for safely disconnecting the high-voltage circuit of a vehicle includes a processing module 612 and a communication module 611. The processing module 612 is used to control and manage the operation of the control device for safely disconnecting the high-voltage circuit of the vehicle, for example, the steps of the receiving unit 601 and the responding unit 602, and / or other processes for performing the techniques described herein. The communication module 611 is used to support interaction between the control device for safely disconnecting the high-voltage circuit of the vehicle and other devices. Figure 6b As shown, the control device for safely disconnecting the high-voltage circuit of a vehicle may include a storage module 613, which is used to store the program code and data of the control device for safely disconnecting the high-voltage circuit of the vehicle.

[0127] The processing module 612 can be a processor or controller, such as a central processing unit (CPU), a general-purpose processor, a digital signal processor (DSP), an ASIC, an FPGA, or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. It can implement or execute the various exemplary logic blocks, modules, and circuits described in conjunction with the disclosure of this application. The processor can also be a combination that implements computational functions, such as a combination of one or more microprocessors, a combination of a DSP and a microprocessor, etc. The communication module 611 can be a transceiver, RF circuitry, or a communication interface, etc. The storage module 613 can be a memory.

[0128] All relevant content in each scenario involved in the above method embodiments can be referenced from the functional descriptions of the corresponding functional modules, and will not be repeated here. The control device 61 for safely cutting off the vehicle's high-voltage circuit can perform the above-mentioned... Figure 4 The control method shown is for safely disconnecting the high-voltage circuit of a vehicle.

[0129] The above embodiments can be implemented, in whole or in part, by software, hardware, firmware, or any other combination thereof. When implemented using software, the above embodiments can be implemented, in whole or in part, as a computer program product. The computer program product includes one or more computer instructions or computer programs. When the computer instructions or computer programs are loaded or executed on a computer, all or part of the processes or functions described in the embodiments of this application are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired or wireless means. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that includes one or more sets of available media. The available medium can be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium. A semiconductor medium can be a solid-state drive.

[0130] Furthermore, this application embodiment also provides a control device for safely disconnecting a vehicle's high-voltage circuit, which is applied to... Figure 2a The power domain controller 303 in the control system shown. Specifically, the control device for safely disconnecting the vehicle's high-voltage circuit is used to perform actions such as... Figure 5 The steps performed by the power domain controller 303 in the control method for safely disconnecting the vehicle's high-voltage circuit are illustrated. The control device for safely disconnecting the vehicle's high-voltage circuit provided in this application embodiment may include modules corresponding to the respective steps.

[0131] This application embodiment can divide the control device for safely disconnecting the high-voltage circuit of a vehicle into functional modules based on the above method example. For example, each function can be divided into its own functional module, or two or more functions can be integrated into one processing module. The integrated module can be implemented in hardware or as a software functional module. The module division in this application embodiment is illustrative and only represents one logical functional division; other division methods may be used in actual implementation.

[0132] When dividing each function into modules according to its corresponding function. Figure 7aThis is a functional unit block diagram of a control device for safely cutting off a vehicle's high-voltage circuit, provided in an embodiment of this application. The control device 70 for safely cutting off a vehicle's high-voltage circuit is applied to a power domain controller 303 corresponding to a vehicle's power battery 200. The vehicle is also equipped with a battery execution and sampling unit 204 corresponding to the power battery 200. The power domain controller 303 is connected to the positive and negative busbars 205 of the power battery 200 through a discharge module. The battery execution and sampling unit 204 is connected to the positive and negative busbars 205, and the positive and negative busbars are respectively connected to the positive and negative terminals of the battery module 203 in the power battery 200. The method includes: a sending unit 701 sending a high-voltage circuit cutting-off command to the battery execution and sampling unit 204; and a response unit 702 responding to the discharge command and discharging the voltage between the positive and negative busbars 205 when it receives a discharge command sent by the battery execution and sampling unit 204 in response to the high-voltage circuit cutting-off command.

[0133] In one possible embodiment, the first detection terminal and the second detection terminal of the power domain controller 303 are respectively connected to the positive and negative buses 205; the response unit 702 is further configured to: after executing the discharge command, instruct the vehicle body controller 420 to remind the user of the high-voltage circuit status through at least one notification method, the high-voltage circuit status being determined by the bus voltage between the positive and negative buses 205 after discharge detected by the first detection terminal 301 and the second detection terminal 302.

[0134] In one possible embodiment, when the bus voltage indicates that the discharge between the positive and negative busbars 205 is complete, the high-voltage circuit status indicates that the high-voltage circuit has been successfully disconnected; when the bus voltage indicates that the discharge between the positive and negative busbars 205 is not complete, the high-voltage circuit status indicates that the high-voltage circuit has failed to be disconnected.

[0135] In one possible embodiment, the vehicle's body controller 420 is instructed to remind the user of the bus voltage between the positive and negative buses 205 via at least one notification method.

[0136] In one possible embodiment, the response unit 702 is further configured to: if the bus voltage is less than the preset voltage, then the discharge between the positive and negative bus 205 is completed; if the bus voltage is greater than or equal to the preset voltage, then the discharge between the positive and negative bus 205 is not completed.

[0137] In one possible embodiment, before sending the high-voltage circuit cut-off command to the battery execution and sampling unit 204, the sending unit 701 is further configured to: wake up the body controller 420 and / or the battery execution and sampling unit 204 if it is detected that the body controller 420 and / or the battery execution and sampling unit 204 is in a sleep state.

[0138] When using integrated units, such as Figure 7b As shown, Figure 7bThis is a functional unit block diagram of another control device for safely cutting off the high-voltage circuit of a vehicle, provided in an embodiment of this application. Figure 7b The control device 71 for safely disconnecting the high-voltage circuit of a vehicle includes a processing module 712 and a communication module 711. The processing module 712 is used to control and manage the operation of the control device for safely disconnecting the high-voltage circuit of the vehicle, for example, the steps of the sending unit 701 and the response unit 702, and / or other processes for performing the techniques described herein. The communication module 711 is used to support interaction between the control device for safely disconnecting the high-voltage circuit of the vehicle and other devices. Figure 7b As shown, the control device for safely disconnecting the high-voltage circuit of a vehicle may include a storage module 713, which is used to store the program code and data of the control device for safely disconnecting the high-voltage circuit of the vehicle.

[0139] The processing module 712 can be a processor or controller, such as a central processing unit (CPU), a general-purpose processor, a digital signal processor (DSP), an ASIC, an FPGA, or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. It can implement or execute the various exemplary logic blocks, modules, and circuits described in conjunction with the disclosure of this application. The processor can also be a combination that implements computational functions, such as a combination of one or more microprocessors, a combination of a DSP and a microprocessor, etc. The communication module 711 can be a transceiver, RF circuitry, or a communication interface, etc. The storage module 713 can be a memory.

[0140] All relevant content in each scenario involved in the above method embodiments can be referenced from the functional descriptions of the corresponding functional modules, and will not be repeated here. The control device 71 for safely cutting off the vehicle's high-voltage circuit can perform the above-mentioned... Figure 5 The control method shown is for safely disconnecting the high-voltage circuit of a vehicle.

[0141] The above embodiments can be implemented, in whole or in part, by software, hardware, firmware, or any other combination thereof. When implemented using software, the above embodiments can be implemented, in whole or in part, as a computer program product. The computer program product includes one or more computer instructions or computer programs. When the computer instructions or computer programs are loaded or executed on a computer, all or part of the processes or functions described in the embodiments of this application are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired or wireless means. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that includes one or more sets of available media. The available medium can be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium. A semiconductor medium can be a solid-state drive.

[0142] Figure 8 This is a structural block diagram of a controller provided in an embodiment of this application. Figure 8 As shown, the controller 80 may include one or more components: a processor 801 and a memory 802 coupled to the processor 801, wherein the memory 802 may store one or more computer programs, which may be configured to implement the methods described in the above embodiments when executed by one or more processors 801. The controller 80 may be the control device 60 or the control device 70 described above for safely disconnecting the vehicle's high-voltage circuit.

[0143] Processor 801 may include one or more processing cores. Processor 801 connects to various parts within the controller 80 using various interfaces and lines, and executes various functions and processes data of the controller 80 by running or executing instructions, programs, code sets, or instruction sets stored in memory 802, and by calling data stored in memory 802. Optionally, processor 801 may be implemented using at least one hardware form of Digital Signal Processing (DSP), Field-Programmable Gate Array (FPGA), or Programmable Logic Array (PLA). Processor 801 may integrate one or more of the following: Central Processing Unit (CPU), Graphics Processing Unit (GPU), and modem. The CPU primarily handles the operating system, user interface, and applications; the GPU is responsible for rendering and drawing the displayed content; and the modem handles wireless communication. It is understood that the modem may also not be integrated into processor 801 and may be implemented separately using a communication chip.

[0144] The memory 802 may include random access memory (RAM) or read-only memory (ROM). The memory 802 can be used to store instructions, programs, code, code sets, or instruction sets. The memory 802 may include a program storage area and a data storage area. The program storage area may store instructions for implementing an operating system, instructions for implementing at least one function (such as touch functionality, sound playback functionality, image playback functionality, etc.), and instructions for implementing the various method embodiments described above. The data storage area may also store data created by the controller 80 during use.

[0145] It is understood that the controller 80 may include more or fewer structural elements than those shown in the block diagram above, and this is not limited thereto.

[0146] This application also provides a computer storage medium storing a computer program / instructions thereon, which, when executed by a processor, implements some or all of the steps of any of the methods described in the above method embodiments.

[0147] This application also provides a computer program product, which includes a non-transitory computer-readable storage medium storing a computer program operable to cause a computer to perform some or all of the steps of any of the methods described in the above method embodiments.

[0148] Furthermore, this application embodiment also provides an electric vehicle, wherein the vehicle further includes a computer storage medium, computer program product, controller, or vehicle high-voltage circuit control system as described in the above device embodiments.

[0149] It should be understood that in the various embodiments of this application, the order of the above-mentioned processes does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0150] In the several embodiments provided in this application, it should be understood that the disclosed methods, apparatuses, and systems can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for example, the division of units is merely a logical functional division, and other division methods may exist in actual implementation; for example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces, and the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms.

[0151] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0152] Furthermore, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can be physically comprised separately, or two or more units can be integrated into one unit. The integrated unit described above can be implemented in hardware or in the form of hardware plus software functional units.

[0153] The integrated units implemented as software functional units described above can be stored in a computer-readable storage medium. These software functional units, stored in a storage medium, include several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute some steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes: a USB flash drive, a portable hard drive, a magnetic disk, an optical disk, volatile memory, or non-volatile memory. The non-volatile memory can be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), or flash memory. The volatile memory can be random access memory (RAM), which is used as an external cache. By way of example, but not limitation, many forms of random access memory (RAM) are available, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate synchronous DRAM (DDR SDRAM), enhanced synchronous DRAM (ESDRAM), synchronous linked DRAM (SLDRAM), and direct rambus RAM (DR RAM), etc., which are various media capable of storing program code.

[0154] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can easily conceive of variations or substitutions without departing from the spirit and scope of the present invention, and various modifications and alterations can be made, including combinations of the different functions and implementation steps described above, as well as software and hardware implementation methods, all of which are within the protection scope of the present invention.

Claims

1. A control system for safely disconnecting a vehicle's high-voltage circuit, characterized in that, include: The system includes a low-voltage mode switch, a power domain controller, and a battery execution and sampling unit. The power domain controller is connected to the positive and negative buses of the power battery via a discharge module. The input terminal of the battery execution and sampling unit is connected to the positive bus via the first and second terminals of the main contactor coil. The output terminal of the battery execution and sampling unit is connected to the negative bus via the first and second terminals of the negative contactor coil. The positive and negative buses are respectively connected to the positive and negative terminals of the battery modules in the power battery. The low-voltage mode switch is located outside the power battery. The power domain controller is used to send a high-voltage circuit cut-off command to the battery execution and sampling unit; The battery execution and sampling unit is used to respond to the high-voltage circuit cut-off command and send a discharge command to the power domain controller when the high-voltage circuit formed by the battery module and the positive and negative busbars is disconnected. The power domain controller is also used to respond to the discharge command and discharge the voltage between the positive and negative buses through the discharge module; The battery execution and sampling unit is also used for: Before sending a discharge command to the power domain controller, the body controller is instructed to remind the user of vehicle status information through at least one notification method. The vehicle status information includes one or more of the following: the sintering status of the main contactor, the sintering status of the negative contactor, and the vehicle leakage status. The low-voltage mode switch is used to send a trigger signal to the power domain controller via a hard-wired signal when a switch trigger operation is detected. The trigger signal is used to instruct the power domain controller to send the high-voltage circuit cut-off command to the battery execution and sampling unit. The battery execution and sampling unit is also used for: Upon receiving the high-voltage circuit cutoff command, a work disallowed command is sent to the battery module and / or one or more high-voltage working modules of the vehicle, and the work disallowed command is continuously sent until the battery execution and sampling unit exits the low-voltage circuit mode, so that the battery module and / or the one or more high-voltage working modules stop working.

2. The control system for safely disconnecting the high-voltage circuit of a vehicle according to claim 1, characterized in that, The first and second detection terminals of the power domain controller are respectively connected to the positive and negative busbars. The power domain controller is further configured to: after executing the discharge command, instruct the vehicle's body controller to remind the user of the high-voltage circuit status through at least one notification method, wherein the high-voltage circuit status is determined by the bus voltage between the positive and negative buses detected by the first detection terminal and the second detection terminal.

3. The control system for safely disconnecting the high-voltage circuit of a vehicle according to claim 2, characterized in that, When the bus voltage indicates that the discharge between the positive and negative buses is complete, the high-voltage circuit status indicates that the high-voltage circuit has been successfully disconnected; when the bus voltage indicates that the discharge between the positive and negative buses is not complete, the high-voltage circuit status indicates that the high-voltage circuit has failed to be disconnected.

4. The control system for safely disconnecting the high-voltage circuit of a vehicle according to claim 2, characterized in that, The power domain controller is also used to instruct the body controller to remind the user of the bus voltage between the positive and negative buses through at least one notification method.

5. The control system for safely disconnecting the high-voltage circuit of a vehicle according to claim 2, characterized in that, The power battery also includes a main contactor and a negative contactor. The positive and negative busbars are connected to the positive and negative terminals of the battery module through the main contactor and the negative contactor, respectively. The battery execution and sampling unit is connected to the positive and negative busbars through the main contactor and the negative contactor. If both the main contactor and the negative contactor are in the open state, the high-voltage circuit is disconnected. The battery execution and sampling unit is further configured to: upon receiving the high-voltage circuit cutoff command, if the main contactor and / or the negative contactor are in a closed state, disconnect the main contactor and / or the negative contactor.

6. The control system for safely disconnecting the high-voltage circuit of a vehicle according to any one of claims 1-5, characterized in that, The power domain controller is also configured to: wake up the vehicle body controller and / or the battery execution and sampling unit if the vehicle body controller and / or the battery execution and sampling unit is in a dormant state before sending a high-voltage circuit cutoff command to the battery execution and sampling unit.

7. A control method for safely disconnecting a vehicle's high-voltage circuit, characterized in that, A battery execution and sampling unit is applied to a power battery in a vehicle. The vehicle also includes a power domain controller and a low-voltage mode switch corresponding to the power battery. The power domain controller is connected to the positive and negative buses of the power battery via a discharge module. The input terminal of the battery execution and sampling unit is connected to the positive bus via the first and second terminals of the main contactor coil. The output terminal of the battery execution and sampling unit is connected to the negative bus via the first and second terminals of the negative contactor coil. The positive and negative buses are respectively connected to the positive and negative terminals of the battery modules in the power battery. The low-voltage mode switch is located externally to the power battery. The method includes: The system receives a high-voltage circuit cutoff command sent by the power domain controller. The high-voltage circuit cutoff command includes a high-voltage circuit cutoff command sent by the power domain controller to the battery execution and sampling unit, which is indicated by a trigger signal sent by the low-voltage mode switch to the power domain controller via a hard-wire signal when the switch trigger operation is detected. The vehicle body controller is instructed to remind the user of vehicle status information through at least one notification method. The vehicle status information includes one or more of the following: the sintering status of the main contactor, the sintering status of the negative contactor, and the vehicle leakage status. In response to the high-voltage circuit disconnection command, when the high-voltage circuit formed by the battery module and the positive and negative busbars is disconnected, a discharge command is sent to the power domain controller so that the power domain controller discharges the voltage between the positive and negative busbars through the discharge module; Upon receiving the high-voltage circuit cutoff command, a work disallowed command is sent to the battery module and / or one or more high-voltage working modules of the vehicle, and the work disallowed command is continuously sent until the battery execution and sampling unit exits the low-voltage circuit mode, so that the battery module and / or the one or more high-voltage working modules stop working.

8. The method according to claim 7, characterized in that, The power battery further includes a main contactor and a negative contactor. The positive and negative busbars are connected to the positive and negative terminals of the battery module through the main contactor and the negative contactor, respectively. The battery execution and sampling unit is connected to the positive and negative busbars through the main contactor and the negative contactor. If both the main contactor and the negative contactor are in the open state, the high-voltage circuit formed by the battery module and the positive and negative busbars is disconnected. The method further includes: Upon receiving the high-voltage circuit disconnection command, if the main contactor and / or the negative contactor are in a closed state, then the main contactor and / or the negative contactor shall be disconnected.

9. A control method for safely disconnecting a vehicle's high-voltage circuit, characterized in that, A power domain controller corresponding to a power battery in a vehicle, wherein the vehicle is further provided with a low-voltage mode switch and a battery execution and sampling unit corresponding to the power battery, the battery execution and sampling unit being used to execute the method as described in claim 7 or 8, the power domain controller being connected to the positive and negative buses of the power battery via a discharge module, the input terminal of the battery execution and sampling unit being connected to the positive bus via the first and second terminals of the coil of the main contactor, the output terminal of the battery execution and sampling unit being connected to the negative bus via the first and second terminals of the coil of the negative contactor, the positive and negative buses being respectively connected to the positive and negative terminals of the battery modules in the power battery; the method includes: When a switch trigger operation is detected, a trigger signal sent by a low-voltage mode switch is received. The trigger signal is used to instruct the power domain controller to send the high-voltage circuit cut-off command to the battery execution and sampling unit. Send a high-voltage circuit cutoff command to the battery execution and sampling unit; Upon receiving a discharge command sent by the battery execution and sampling unit in response to the high-voltage circuit cutoff command, the voltage between the positive and negative busbars is discharged through the discharge module in response to the discharge command.

10. The method according to claim 9, characterized in that, The first and second detection terminals of the power domain controller are respectively connected to the positive and negative buses; the method further includes: After executing the discharge command, the vehicle's body controller is instructed to remind the user of the high-voltage circuit status through at least one notification method. The high-voltage circuit status is determined by the bus voltage between the positive and negative buses after discharge, detected by the first detection terminal and the second detection terminal.

11. The method according to claim 10, characterized in that, When the bus voltage indicates that the discharge between the positive and negative buses is complete, the high-voltage circuit status indicates that the high-voltage circuit has been successfully disconnected; when the bus voltage indicates that the discharge between the positive and negative buses is not complete, the high-voltage circuit status indicates that the high-voltage circuit has failed to be disconnected.

12. The method according to claim 11, characterized in that, If the bus voltage is less than the preset voltage, the discharge between the positive and negative buses is completed. If the bus voltage is greater than or equal to the preset voltage, then the discharge between the positive and negative buses is not complete.

13. The method according to any one of claims 9-12, characterized in that, Before sending the high-voltage circuit cutoff command to the battery execution and sampling unit, the method further includes: If the body controller and / or the battery execution and sampling unit are detected to be in a sleep state, then the body controller and / or the battery execution and sampling unit are woken up.

14. The method according to any one of claims 9-12, characterized in that, The method further includes: The vehicle's body controller is instructed to notify the user of the bus voltage between the positive and negative buses through at least one notification method.

15. A vehicle, characterized in that, The vehicle includes a control system for safely disconnecting the vehicle's high-voltage circuit as described in any one of claims 1-6.

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