CN114312318A

CN114312318A - High-voltage interlocking system, electric drive system, power assembly and electric vehicle

Info

Publication number: CN114312318A
Application number: CN202110131706.1A
Authority: CN
Inventors: 刘晓龙; 夏全飞
Original assignee: Huawei Digital Power Technologies Co Ltd
Current assignee: Huawei Digital Power Technologies Co Ltd
Priority date: 2021-01-30
Filing date: 2021-01-30
Publication date: 2022-04-12

Abstract

The application provides a high-voltage interlocking system, an electric drive system, a power assembly and an electric vehicle, and relates to the technical field of electric vehicles. The input of high-pressure interlocking system connects power battery group, and high-pressure interlocking detecting system includes: high voltage distribution box and controller. The high-voltage distribution box comprises a direct-current busbar and at least two groups of output ends; the input end of the high-voltage distribution box is the input end of the high-voltage interlocking system, and the input end of the high-voltage distribution box is connected with at least two groups of output ends through a direct-current bus; at least two groups of output ends for connecting the input end of the high-voltage loop and the input end of the high-voltage device; the controller determines whether the high-voltage loop has interlocking faults or not according to the output voltage of the power battery pack and the input voltage of the high-voltage loop; and determining whether the interlocking fault exists in the high-voltage device according to the output voltage of the power battery pack and the input voltage of the high-voltage device. By utilizing the high-voltage interlocking system, the maintenance and the troubleshooting are convenient, and the occupied volume and the cost are also reduced.

Description

High-voltage interlocking system, electric drive system, power assembly and electric vehicle

Technical Field

The application relates to the technical field of electric vehicles, in particular to a high-voltage interlocking system, an electric driving system, a high-voltage distribution box, a detection method, a power assembly and an electric vehicle.

Background

The high-voltage loop of the electric vehicle comprises various high-voltage branch loops and high-voltage components which are connected with a high-voltage bus on the electric vehicle, and comprises high-voltage branch loops such as a battery system, a lead, a connector, a Direct Current (DC) -DC circuit, a Motor Controller (MCU), a high-voltage Distribution box (PDU) and a component protective cover.

At present, the continuity of a high-voltage circuit is detected through a high-voltage interlocking system on an electric vehicle, so that when the connection of the high-voltage interlocking circuit is disconnected or the integrity of the high-voltage interlocking circuit is damaged, safety measures such as alarming or disconnection of the high-voltage circuit are started. The High-Voltage interlocking System comprises a High-Voltage interlocking Loop (HVIL), sometimes called a dangerous Voltage interlocking System and Control cable, wherein in the High-Voltage interlocking Loop, the High-Voltage branch loops are connected with each other through a High-Voltage connector and an interlocking cable, the High-Voltage connector integrates HVIL interfaces, two PIN PINs are generally arranged in each HVIL interface, and after the High-Voltage connectors are plugged, the two PIN PINs are in a short-circuit state; after the high-voltage connector is disconnected, the two PIN feet are in an open circuit state, and when the two PIN feet are in an open circuit state, the interlocking fault of the high-voltage interlocking loop is judged, namely the connection problem of loose connection and the like occurs in the high-voltage interlocking loop.

However, the above solutions can only determine the integrity of the whole high-voltage interlock circuit, and cannot accurately determine the faulty high-voltage branch circuit or high-voltage component, which is not beneficial to maintenance and troubleshooting, and also require a high-voltage connector with an HVIL interface and a cable, which increases the occupied volume and the detection cost.

Disclosure of Invention

In order to solve the technical problems in the prior art, the application provides a high-voltage interlocking system, an electric drive system, a high-voltage distribution box, a detection method, a power assembly and an electric vehicle, which are convenient for maintenance and troubleshooting, and also reduce the occupied volume and the detection cost of the high-voltage interlocking system.

In a first aspect, the present application provides a high voltage interlock system, wherein an input terminal of the high voltage interlock system is connected to a power battery pack, and the power battery pack provides a dc power supply for the high voltage interlock system. The high voltage interlock system includes a high voltage distribution box and a controller. The high-voltage distribution box comprises a direct-current busbar and at least two groups of output ends. The input of high voltage distribution box is high voltage interlocking system's input, and the input of high voltage distribution box is female the connection at least two sets of outputs of arranging through the direct current to make the direct current that power battery group provided supply power through at least two sets of outputs. Each set of output ports includes two ports, namely a positive output port and a negative output port. And at least two groups of output ends are used for connecting the input end of the high-voltage loop or the input end of the high-voltage device. The controller determines whether the high-voltage loop has interlocking faults or not according to the output voltage of the power battery pack and the input voltage of the high-voltage loop; and determining whether the interlocking fault exists in the high-voltage device according to the output voltage of the power battery pack and the input voltage of the high-voltage device.

The high-voltage interlocking system provided by the embodiment of the application can realize the accurate positioning of the connection fault and is convenient for maintenance and troubleshooting by acquiring the input end voltage of each part of high-voltage devices and high-voltage loops in real time and determining whether the connection fault exists in each part of high-voltage devices and high-voltage loops according to the acquired input end voltage and the output voltage of the power battery pack. In addition, the high-voltage interlocking system judges the interlocking state based on the voltage relation, so that a high-voltage connector with an HVIL interface and an interlocking cable are not needed, the wiring difficulty inside the equipment is reduced, and the occupied volume and the detection cost of the high-voltage interlocking system are also reduced.

In a possible implementation manner, when the difference value between the output voltage of the power battery pack and the input voltage of the high-voltage circuit is greater than a preset threshold value, the controller determines that the high-voltage circuit has an interlock fault, at which the high-voltage circuit may have a problem of loose connection, and the integrity and continuity of the high-voltage interlock are damaged. And when the difference value between the output voltage of the power battery pack and the input voltage of the high-voltage device is larger than a preset threshold value, the controller determines that the high-voltage device has an interlocking fault, and the connection of the high-voltage device is possible to be loosened.

In one possible implementation, the Controller is a Vehicle Control Unit (VCU), the VCU receives a Controller Area Network (CAN) signal sent by a BMC to obtain an output voltage of the power battery pack, the VCU receives a Controller Area Network (CAN) signal sent by a high-voltage circuit to obtain an input voltage of the high-voltage circuit, and the VCU receives a CAN signal sent by a high-voltage device to obtain an input voltage of the high-voltage device.

In a possible implementation manner, the Controller is a Battery Management Controller (BMC), the BMC receives voltage Information sent by a Battery Information Collector (BIC) to obtain an output voltage of the power Battery pack, the BMC receives a CAN signal sent by the high-voltage circuit to obtain an input voltage of the high-voltage circuit, and the BMC receives a CAN signal sent by the high-voltage device to obtain an input voltage of the high-voltage device.

In one possible implementation manner, the controller is integrated in the high-voltage distribution box, and at the moment, the controller receives a CAN signal sent by the battery management controller to obtain the output voltage of the power battery pack, receives a CAN signal sent by the high-voltage loop to obtain the input voltage of the high-voltage loop, and receives a CAN signal sent by the high-voltage device to obtain the input voltage of the high-voltage device.

In one possible embodiment, each group of outputs is integrated in a high-voltage connector, so that the high-voltage circuit and the high-voltage component can be connected to the high-voltage distribution box via the high-voltage connector.

In one possible implementation, the high-voltage connector is a tamper-proof high-voltage connector to improve the connectivity of the high-voltage interlock system.

In one possible implementation, the controller performs power-limiting operation on the high-voltage device when it is determined that the interlock fault exists in the high-voltage device; and when the interlocking fault of the high-voltage circuit is determined, performing power-down operation on the high-voltage circuit.

In one possible implementation, the high-voltage circuit includes at least one of an ac charging circuit, a dc charging circuit, or an external discharging circuit.

In one possible implementation, the high voltage device includes at least one of a motor controller, a dc-dc circuit, a battery heater, a passenger compartment heater, or an air conditioning compressor.

When the controller determines that the direct current charging circuit, the alternating current charging circuit and the external discharging circuit have interlocking faults, the electric vehicle is in a static state at the moment, and therefore the high-voltage circuit can be directly controlled to be powered down. For high-voltage devices such as a DC-DC circuit and a motor controller, the vehicle may be in a running state during power-on operation, so that in order to ensure the safety of the electric vehicle, the controller further performs power limitation operation on the high-voltage devices when determining that the high-voltage devices have an interlocking fault, or timely gives an alarm to indicate a driver to perform power-off operation on the high-voltage devices, and further reserves the time for performing power-off operation when stopping the vehicle.

In a second aspect, the present application further provides a high voltage distribution box comprising: the input end is used for connecting a power battery pack, and the input end is connected with at least two groups of output ends through the direct-current busbar. And at least two groups of output ends are used for connecting the input end of the high-voltage loop and the input end of the high-voltage device. The controller is used for determining that the interlocking fault exists in the high-voltage loop according to the output voltage of the power battery pack and the input voltage of the high-voltage loop; and determining whether the interlocking fault exists in the high-voltage device according to the output voltage of the power battery pack and the input voltage of the high-voltage device.

The controller of the high-voltage distribution box acquires the input end voltage of each high-voltage device and each high-voltage loop in real time through the CAN signal, determines whether the high-voltage devices and the high-voltage loops have connection faults or not according to the acquired input end voltage and the output voltage of the power battery pack, CAN realize accurate positioning of the connection faults, and is convenient to maintain and remove the faults. In addition, the controller judges the interlocking state based on the voltage relation, so that a high-voltage connector with an HVIL interface and an interlocking cable do not need to be arranged, the wiring difficulty inside the equipment is reduced, and the occupied volume and the detection cost are also reduced.

In one possible implementation manner, the controller is specifically configured to determine whether there is an interlock fault in the high-voltage circuit when a difference between an output voltage of the power battery pack and an input voltage of the high-voltage circuit is greater than a preset threshold; and when the difference value between the output voltage of the power battery pack and the input voltage of the high-voltage device is larger than a preset threshold value, determining that the high-voltage device has an interlocking fault.

In one possible implementation manner, the controller receives a CAN signal sent by the BMC to acquire the output voltage of the power battery pack, the controller receives a CAN signal sent by the high-voltage loop to acquire the input voltage of the high-voltage loop, and the controller receives a CAN signal sent by the high-voltage device to acquire the input voltage of the high-voltage device.

In one possible implementation, each set of outputs is integrated in one high-voltage connector. The high-voltage device and the high-voltage circuit can be connected with the high-voltage distribution box through the high-voltage connector.

In a third aspect, the present application further provides an electric drive system, which includes the high-voltage interlock system provided in the first aspect and the implementation manner thereof, and further includes a high-voltage circuit and a high-voltage device. The input end of the high-voltage loop and the input end of the high-voltage device are used for being connected with the output end of the high-voltage distribution box. The high-voltage circuit comprises at least one of an alternating current charging circuit, a direct current charging circuit or an external discharging circuit. The high voltage device includes at least one of a motor controller, a dc-dc circuit, or a battery heater.

In this case, the controller may be a vehicle controller, a BMC in a battery management system, or a controller provided in a high-voltage distribution box, which is not limited in this application.

In a fourth aspect, the present application further provides an electric drive system, which includes the high voltage distribution box provided in the second aspect and the implementation manner thereof, and further includes a high voltage loop and a high voltage device. At this time, the controller is disposed within the high voltage distribution box. The input end of the high-voltage loop and the input end of the high-voltage device are used for being connected with the output end of the high-voltage distribution box. The high-voltage circuit comprises at least one of an alternating current charging circuit, a direct current charging circuit or an external discharging circuit. The high voltage device includes at least one of a motor controller, a dc-dc circuit, or a battery heater.

In a fifth aspect, the present application further provides a high-voltage interlock detection method, which is applied to the high-voltage interlock system provided in the above embodiment, and the method includes:

determining whether the high-voltage loop has interlocking fault according to the output voltage of the power battery pack and the input voltage of the high-voltage loop;

and determining whether the interlocking fault exists in the high-voltage device or not according to the output voltage of the power battery pack and the input voltage of the high-voltage device.

In one possible implementation, the method further comprises the steps of:

and determining the output voltage of the power battery pack, the input voltage of the high-voltage loop and the input voltage of the high-voltage device according to the voltage information in the CAN signal of the controller area network.

In a possible implementation manner, determining whether an interlock fault exists in the high-voltage circuit according to the output voltage of the power battery pack and the input voltage of the high-voltage circuit specifically includes:

and when the difference value between the output voltage of the power battery pack and the input voltage of the high-voltage loop is greater than a preset threshold value, determining that the high-voltage loop has an interlocking fault.

According to the output voltage of the power battery pack and the input voltage of the high-voltage device, whether the high-voltage device has an interlocking fault or not is determined, and the method specifically comprises the following steps:

and when the difference value between the output voltage of the power battery pack and the input voltage of the high-voltage device is larger than a preset threshold value, determining that the high-voltage device has an interlocking fault.

In one possible implementation, the method further includes:

when the interlocking fault of the high-voltage device is determined, performing power limiting operation on the high-voltage device;

and when the interlocking fault of the high-voltage circuit is determined, performing power-down operation on the high-voltage circuit.

The high-voltage circuit comprises at least one of an alternating current charging circuit, a direct current charging circuit or an external discharging circuit. The high voltage device includes at least one of a motor controller, a dc-dc circuit, a battery heater, a passenger compartment heater, or an air conditioning compressor.

When the direct current charging circuit, the alternating current charging circuit and the external discharging circuit are determined to have interlocking faults, the electric vehicle is in a static state at the moment, and therefore the high-voltage circuit can be directly controlled to be powered off. For high-voltage devices such as a DC-DC circuit and a motor controller, the vehicle may be in a running state during power-on operation, so that in order to ensure the safety of the electric vehicle, when the high-voltage devices are determined to have an interlocking fault, the power limiting operation is further performed on the high-voltage devices, or an alarm is timely given to indicate a driver to perform power-off operation on the high-voltage devices, and further the time for performing power-off operation during parking is reserved for the driver.

In a sixth aspect, the present application further provides a power assembly, where the power assembly includes the electric drive system provided in the foregoing implementation manner, and further includes a motor. The motor is used for converting electric energy provided by the power battery pack into mechanical energy to drive the electric vehicle.

The power assembly can realize accurate positioning of connection faults, and is convenient to maintain and remove faults. In addition, a high-voltage connector with an HVIL interface and an interlocking cable do not need to be arranged, the wiring difficulty inside the equipment is reduced, and the occupied volume and the detection cost are also reduced.

In a seventh aspect, the present application further provides an electric vehicle, which includes the power assembly provided in the above sixth aspect, and further includes a power battery pack. Wherein, the output of power battery group is used for connecting the input of high voltage distribution box. The power battery pack is used for inputting direct current to the power assembly.

Drawings

FIG. 1 is a schematic diagram of an exemplary electric vehicle electrical system provided in an embodiment of the present application;

FIG. 2 is a schematic diagram of a high-voltage interlock system provided by an embodiment of the present application;

FIG. 3 is a schematic diagram of another high-voltage interlock system provided by an embodiment of the present application;

fig. 4 is a schematic diagram of an exemplary power supply system provided in an embodiment of the present application;

FIG. 5 is a schematic view of yet another high-voltage interlock system provided by an embodiment of the present application;

fig. 6 is a schematic diagram of a high voltage distribution box provided in an embodiment of the present application;

FIG. 7 is a schematic diagram of an electric drive system provided by an embodiment of the present application;

FIG. 8 is a schematic illustration of another electric drive system provided by an embodiment of the present application;

fig. 9 is a schematic diagram of a high-voltage interlock detection method according to an embodiment of the present disclosure;

FIG. 10 is a schematic illustration of a powertrain according to an embodiment of the present disclosure;

FIG. 11 is a schematic illustration of another powertrain provided by an embodiment of the present application;

fig. 12 is a schematic view of an electric vehicle according to an embodiment of the present application.

Detailed Description

In order to make the technical field of the present application more clearly understand, an application scenario of the solution provided in the present application is first described below.

Referring to fig. 1, a schematic diagram of an exemplary electric vehicle electrical system according to an embodiment of the present disclosure is shown.

The electric system of the illustrated electric vehicle mainly includes a power supply system 10, a high-voltage distribution box 20, a motor controller 30, a motor 40, a DC-DC circuit 50, a low-voltage battery 60, a direct-current charging circuit 70, and an alternating-current charging circuit 80.

The power supply System 10 includes a power Battery pack 101 and a Battery Management System (BMS) 102. The power battery pack 10 is used for providing high-voltage direct current, and a part of the direct current is converted into alternating current after passing through the high-voltage distribution box 20 and the motor controller 30 and is provided to the motor 40 to drive the electric vehicle. Another part of the direct current passes through the high voltage distribution box 20 and the DC-DC circuit 50 and is then converted into low voltage direct current to be supplied to the low voltage battery 60 and the low voltage system of the electric vehicle.

When the electric vehicle is charged, in some embodiments, the electric vehicle charges the power battery pack 101 through the dc charging circuit 70, and the dc charging circuit 70 is connected to the dc charging post, which is also called "dc fast charging".

In other embodiments, the electric vehicle is charged by the ac charging circuit 80, where the ac charging circuit 80 is connected to the ac charging post, and where the ac charging circuit 80 may be an On-Board Charger (OBC). The OBC may also simultaneously charge the low voltage battery 60.

The battery management system 102 is a functional unit for monitoring and managing charging and discharging of the power battery pack 101, and is configured to ensure that the power battery pack 10 is in a safe and controllable state range.

The high-voltage devices of the parts and the high-voltage end of the loop are connected with a direct-current bus of the electric vehicle to form a high-voltage loop, and when the electric vehicle runs, the high-voltage loop always accompanies vibration and impact, so that safety risk exists.

One of the risks of a high voltage circuit is a sudden power outage, which can result in the loss of power to the electric vehicle. One of the reasons for the sudden power failure is the automatic release of the high voltage device and the circuit connection. The high-voltage interlocking system can monitor the sign and provide alarm information for a Vehicle Control Unit (VCU) before power failure, and the time for taking countermeasures of the Vehicle system is reserved.

Another risk of high voltage systems of electric vehicles is human mishandling, i.e. manual disconnection of the high voltage connection points. If no high-voltage interlocking system exists, the voltage of the whole loop is applied to two ends of the break point at the moment of disconnection, so that the voltage can break through air, an arc is drawn between two ends of the power failure, and people and equipment around the break point are injured.

In summary, from the perspective of functional safety, a high-voltage interlock system needs to be provided for the high-voltage circuit, so as to monitor the high-voltage devices and circuits of the above parts, thereby reducing the probability of risk occurrence.

In a high-voltage interlocking loop of a current high-voltage interlocking system, high-voltage devices and loops of the high-voltage interlocking system are connected in pairs through high-voltage connectors and cables, the high-voltage connectors are integrated with HVIL interfaces, two PIN PINs are generally arranged in each HVIL interface, and when the high-voltage connectors are plugged, the two PINs are in a short-circuit state; when the high-voltage connector is disconnected, the two PIN PINs are in an open circuit state.

The detection signal can be transmitted along the closed high-voltage interlocking loop, and once the detection signal is interrupted, the looseness or the falling-off of one high-voltage connector is indicated. However, the above solutions can only determine the integrity of the whole high-voltage interlock circuit, and cannot accurately determine the faulty high-voltage branch circuit or high-voltage component, which is not beneficial to maintenance and troubleshooting, and also require a high-voltage connector with an HVIL interface and a cable, which increases the occupied volume and the detection cost.

In order to solve the above problems, embodiments of the present application provide a high-voltage interlock system, an electric drive system, a high-voltage distribution box, a detection method, a power assembly, and an electric vehicle, which determine whether a connection fault exists in each of high-voltage devices and circuits by acquiring input end voltages of each of the high-voltage devices and circuits in real time and comparing the acquired input end voltages with an output voltage of a power battery pack, so that accurate positioning of the connection fault can be achieved, and maintenance and troubleshooting are facilitated. In addition, high voltage connectors and cables with HVIL interfaces are not required, and the occupied volume and detection cost of the high voltage interlock system are reduced.

In order to make the technical solutions more clearly understood by those skilled in the art, the technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.

The terms "first", "second", and the like in the description of the present application are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated

In the present application, unless expressly stated or limited otherwise, the term "coupled" is to be construed broadly, e.g., "coupled" may be a fixed connection, a removable connection, or an integral part; may be directly connected or indirectly connected through an intermediate.

In the following drawings, power transmission lines are shown by solid lines and signal transmission lines are shown by dotted lines.

The embodiments of the present application provide a high-voltage interlock system, which is described in detail below with reference to the accompanying drawings.

Referring to fig. 2, a schematic diagram of a high-voltage interlock system according to an embodiment of the present disclosure is shown.

The input of the illustrated high voltage interlock system is connected to the output of the power cell pack 101, and the high voltage interlock system includes: a Power Distribution Unit (PDU) 20 and a controller 90.

The high voltage distribution box 20 includes a dc bus bar 201 therein, and the high voltage distribution box 20 further includes at least two sets of output interfaces 202.

The input of the high voltage distribution box 20 is the input of the high voltage interlock system. The input terminals of the high voltage distribution box 20 include a positive input terminal and a negative input terminal. Wherein, the positive input end is connected with the positive output end of the power battery pack 101, and the negative input end is connected with the negative output end of the power battery pack 101.

Each set of output ports 202 includes a positive output port and a negative output port.

The dc bus bar 201 includes a positive dc bus bar and a negative dc bus bar. The positive dc bus bar is connected to the positive input end of the high voltage distribution box 20 and the positive output port of the output end 202, and the negative dc bus bar is connected to the negative input end of the high voltage distribution box 20 and the negative output port of the output end 202.

The high voltage distribution box 20 is used to supply the dc power input from the power battery pack 101 to the high voltage circuit 300 and the high voltage device 400 through the output terminal.

The controller 90 is configured to determine whether an interlock fault exists in the high voltage circuit based on the output voltage of the power battery pack 101 and the input voltage of the high voltage circuit 300, and determine whether an interlock fault exists in the high voltage device based on the output voltage of the power battery pack 101 and the input voltage of the high voltage device 400.

In some embodiments, a dc bus bar is included in the high voltage circuit 300. Similarly, the dc bus of the high voltage circuit 300 includes a positive dc bus and a negative dc bus, where the positive dc bus is connected to the positive input port of the high voltage circuit 300, and the negative dc bus is connected to the negative input port of the high voltage circuit 300. The input voltage of the high voltage circuit 300 is the voltage of the dc bus bar input to the high voltage circuit through the input terminal of the high voltage circuit 300. The detection circuit and the controller included in the high voltage loop 300 can detect the magnitude of the input voltage, and in the embodiment of the present application, the detection data of the input voltage of the high voltage loop 300 is directly utilized to determine the interlock fault.

In some embodiments, a dc bus bar is included in the high voltage device 400. Similarly, the dc bus of the high-voltage device 400 includes a positive dc bus and a negative dc bus, where the positive dc bus is connected to the positive input port of the high-voltage device 400, and the negative dc bus is connected to the negative input port of the high-voltage device 400, and the input voltage is provided to the load circuit or the load device through the dc bus. The input voltage of the high voltage device 400 is the voltage of the dc bus bar input to the high voltage device through the input terminal of the high voltage device 400. The detection circuit and the controller included in the high voltage device 400 can detect the magnitude of the input voltage, and in the embodiment of the present application, the detection data of the input voltage of the high voltage device 400 is directly used for judging the interlock fault.

The controller 90 in the above embodiments of the present Application may be an Application Specific Integrated Circuit (ASIC), a Programmable Logic Device (PLD), a Digital Signal Processor (DSP), or a combination thereof. The PLD may be a Complex Programmable Logic Device (CPLD), a Field-Programmable Gate Array (FPGA), a General Array Logic (GAL), or any combination thereof, and the embodiments of the present invention are not limited in particular.

In summary, by using the high-voltage interlocking system provided by the embodiment of the application, the input end voltages of the high-voltage devices and the high-voltage circuit of each part are obtained in real time, and whether the high-voltage devices and the high-voltage circuit of each part have connection faults or not is determined according to the obtained input end voltages and the output voltage of the power battery pack, so that the connection faults can be accurately positioned, and the maintenance and fault removal are facilitated. In addition, the high-voltage interlocking system judges the interlocking state based on the voltage relation, so that a high-voltage connector with an HVIL interface and an interlocking cable are not needed, the wiring difficulty inside the equipment is reduced, and the occupied volume and the detection cost of the high-voltage interlocking system are also reduced.

The system shown in fig. 2 includes a power transmission line (solid line) and a signal transmission line (dashed line).

Wherein the loop formed by the power transmission line is a power loop used for providing energy for each part of the electric vehicle,

the loop formed by the signal transmission line is a communication loop for realizing communication between devices, and specifically is a Controller Area Network (CAN) loop, which takes the vehicle Controller 20 as a core.

The following description is made in conjunction with a specific implementation of the high-pressure interlock system.

Referring to fig. 3, a schematic diagram of another high-voltage interlock system provided in an embodiment of the present application is shown.

The controller of the illustrated high voltage interlock system is implemented by the VCU 901.

The illustrated high-voltage circuit includes a dc charging circuit 301, an ac charging circuit 302, and an external discharging circuit 303.

The dc charging circuit 301 corresponds to the dc charging circuit 70 in fig. 1, and is used for connecting an external dc power source, such as a dc charging post.

The ac charging circuit 302 corresponds to the ac charging circuit 80 in fig. 1, and is used for connecting an external ac power source, such as an ac charging post. In one possible implementation, the ac charging circuit 302 is an on-board charger (OBC).

The external discharge circuit 303 is used for discharging an external load from a power battery pack supporting the electric Vehicle, and in some embodiments, when the electric Vehicle supports the Vehicle to supply power to other devices (V2X), the load may be an external power device; when the electric Vehicle supports Vehicle-to-grid (V2G), the load may be a dc grid; when the electric Vehicle supports the Vehicle-to-Vehicle power (V2V), the load is the other electric Vehicle.

In other embodiments, the above high-pressure circuits may exist simultaneously or one or more of them, and the embodiments of the present application are not particularly limited.

The illustrated high voltage devices include a motor controller 30, a DC-DC circuit 50, a battery heater 403, a passenger compartment heater 404, and an air conditioning compressor 405.

The motor controller 30 is configured to convert the dc power to ac power and provide the ac power to the motor.

The DC-DC circuit 50 is used to convert the high voltage DC power to low voltage DC power for supply to the low voltage battery and the low voltage system of the electric vehicle. In some embodiments, the DC-DC circuit 50 may not be connected to the high voltage distribution box, but rather take a high voltage DC input from the motor controller 30.

The motor heater 403 generally utilizes a Positive Temperature Coefficient (PTC) resistor to convert electrical energy into heat energy to heat the power battery pack 101, so as to improve the electrochemical performance of the power battery pack.

The passenger compartment heater 404 is similar to the motor heater 403, and heats the passenger compartment by converting electric energy into thermal energy using the PTC resistor.

The air conditioner compressor 405 is used to compress a driving refrigerant in an air conditioner refrigerant circuit.

In other embodiments, the above high voltage devices may exist simultaneously or one or more of them may exist, and the embodiments of the present application are not particularly limited.

For the above high-voltage loops and high-voltage devices, communication is realized with the VCU901 through a CAN signal, and the CAN signal carries voltage information of a direct-current input voltage (i.e., a direct-current voltage of each busbar).

Referring to fig. 4, the drawing is a schematic diagram of an exemplary power supply system provided in an embodiment of the present application.

The power supply system 10 includes a power battery pack 101 and a BMS 102. The BMS102 includes a Battery Information Collector (BIC) 1021 and a Battery Management Controller (BMC). The BIC1021 is used for collecting the output voltage of the power battery pack and transmitting the voltage information to the BMC 1022.

The BMC1022 sends a CAN signal carrying voltage information to the VCU901, so that the VCU901 obtains the output voltage of the power battery pack.

The VCU901 receives a CAN signal sent by the high-voltage circuit to obtain an input voltage of the high-voltage circuit, and the VCU901 receives a CAN signal sent by the high-voltage device to obtain an input voltage of the high-voltage device.

In some embodiments, the VCU901 determines that there is an interlock fault in the high-voltage circuit when the difference between the output voltage of the power battery pack and the input voltage of the high-voltage circuit is greater than a preset threshold, that is, it is determined that there may be a problem that the connection in the high-voltage circuit is released at this time.

In order to avoid misjudging that the interlock fault occurs in the high-voltage circuit, when the VCU901 determines that the difference is greater than the preset threshold and the duration time exceeds the preset time, it is determined that the interlock fault occurs in the high-voltage circuit, and the length of the preset time is not specifically limited in the embodiment of the present application.

In other embodiments, the VCU901 may also determine that there is an interlock fault in the high-voltage circuit when the ratio of the output voltage of the power battery pack to the input voltage of the high-voltage circuit is greater than a preset ratio.

Further, when the VCU901 determines that the interlock fault exists in the high-voltage circuit, the VCU may further perform power-off operation on the high-voltage circuit, or perform warning in time to instruct the driver to perform power-off operation on the high-voltage circuit.

When the difference value between the output voltage of the power battery pack and the input voltage of the high-voltage device is greater than the preset threshold value, the VCU901 determines that the high-voltage device has an interlocking fault, that is, it determines that the high-voltage device may have problems such as loose connection at the time.

In order to avoid misjudging that the high-voltage device has an interlock fault, when the VCU901 determines that the difference is greater than the preset threshold and the duration time exceeds the preset time, it determines that the interlock fault exists in the high-voltage device.

In other embodiments, the VCU901 may also determine that the interlock fault exists in the high-voltage device when the ratio of the output voltage of the power battery pack to the input voltage of the high-voltage device is greater than a preset ratio.

Other similar voltage comparison methods can also be adopted, but the judgment principle is similar, and the embodiments of the present application are not described in detail herein.

When the VCU901 determines that the interlock fault occurs in the dc charging circuit 301, the ac charging circuit 302, and the external discharging circuit 303, the electric vehicle is in a stationary state, and therefore, the high-voltage circuit can be directly controlled to be powered down. For high-voltage devices such as a DC-DC circuit and a motor controller, the vehicle may be in a driving state during power-on operation, so to ensure safety of the electric vehicle, in an excellent implementation manner, when the VCU901 determines that the high-voltage device has an interlock fault, the VCU may further perform power limitation operation on the high-voltage device, or perform an alarm in time to instruct a driver to perform power-off operation on the high-voltage device, thereby reserving time for performing power-off operation when the driver stops.

In one possible implementation, each set of outputs of the high voltage distribution box 20 is integrated into one high voltage connector, and the inputs of the above high voltage circuits and high voltage devices are connected to the high voltage connectors and thus to the outputs of the high voltage distribution box. The specific type of the high-voltage connector is not limited in the embodiments of the present application, and in some embodiments, the high-voltage connector is a non-detachable high-voltage connector.

To sum up, the high-voltage interlocking system provided by the embodiment of the application acquires the input end voltage of each high-voltage device and each high-voltage loop in real time through the CAN signal, and determines whether the high-voltage devices and the high-voltage loops have connection faults or not according to the acquired input end voltage and the output voltage of the power battery pack, so that the connection faults CAN be accurately positioned, and the maintenance and the fault removal are facilitated. In addition, the high-voltage interlocking system judges the interlocking state based on the voltage relation, so that a high-voltage connector with an HVIL interface and an interlocking cable do not need to be arranged, the wiring difficulty inside the equipment is reduced, and the occupied volume and the detection cost of the high-voltage interlocking system are also reduced.

Another possible implementation of the high-pressure interlock system is described below.

Referring to fig. 5, a schematic diagram of another high-voltage interlock system provided in an embodiment of the present application is shown.

The controller of the illustrated high voltage interlock system is implemented by the battery management system 102, and further, with reference to the power supply system shown in fig. 4, the controller is embodied as a BMC1022 in the battery management system 102.

For specific implementation of the high voltage circuit and the high voltage device, reference may be made to the above embodiments, and details of this embodiment are not repeated herein.

The BIC1021 is used for collecting output voltage of the power battery pack and sending voltage information to the BMC 1022.

The BMC1022 receives the CAN signals sent by the high-voltage loops to obtain the input voltage of the high-voltage loops, and the BMC1022 receives the CAN signals sent by the high-voltage devices to obtain the input voltage of the high-voltage devices.

In some embodiments, when the difference between the output voltage of the power battery pack and the input voltage of the high-voltage circuit is greater than a preset threshold, the BMC1022 in the battery management system determines that there is an interlock fault in the high-voltage circuit, that is, determines that there may be a problem such as loose connection in the high-voltage circuit at this time.

In order to avoid misjudging that the interlocking fault occurs in the high-voltage circuit, when the difference is determined to be greater than the preset threshold value and the duration time exceeds the preset time, the BMC1022 determines that the interlocking fault occurs in the high-voltage circuit.

In other embodiments, the BMC1022 may also determine that an interlock fault exists in the high-voltage circuit when the ratio of the output voltage of the power battery pack to the input voltage of the high-voltage circuit is greater than a preset ratio.

Further, when the BMC1022 determines that the interlock fault exists in the high-voltage circuit, the BMC may further perform power-off operation on the high-voltage circuit, or perform an alarm in time to instruct the driver to perform power-off operation on the high-voltage circuit.

When the difference value between the output voltage of the power battery pack and the input voltage of the high-voltage device is larger than a preset threshold value, the BMC1022 in the battery management system determines that the high-voltage device has an interlocking fault, namely determines that the high-voltage device may have the problems of loose connection and the like.

In order to avoid misjudgment of the interlocking fault of the high-voltage device, when the difference is determined to be larger than the preset threshold value and the duration time exceeds the preset time, the BMC1022 determines that the interlocking fault exists in the high-voltage device.

In other embodiments, the BMC1022 may also determine that an interlock fault exists in the high-voltage device when the ratio of the output voltage of the power battery pack to the input voltage of the high-voltage device is greater than a preset ratio.

When determining that the direct current charging circuit 301, the alternating current charging circuit 302 and the external discharging circuit 303 have an interlocking fault, the BMC1022 may directly control the high-voltage circuit to be powered down since the electric vehicle is in a stationary state at this time. For high-voltage devices such as a DC-DC circuit and a motor controller, the vehicle may be in a running state during the power-on operation process, so in order to ensure the safety of the electric vehicle, in an excellent implementation manner, when the high-voltage devices are determined to have an interlocking fault, the BMC1022 may further perform power limitation operation on the high-voltage devices, or perform an alarm in time to instruct a driver to perform power-off operation on the high-voltage devices, thereby reserving the time for performing the power-off operation during parking for the driver.

To sum up, the high-voltage interlocking system that this application embodiment provided, the multiplexing BMS of controller, BMC in the concrete multiplexing BMS acquires the input voltage of each part high-voltage device and high-voltage circuit in real time through the CAN signal to confirm whether each part high-voltage device and high-voltage circuit have connection fault according to the input voltage who acquires and the output voltage of power battery group, CAN realize connection fault's accurate positioning, be convenient for maintain and troubleshooting. In addition, the high-voltage interlocking system judges the interlocking state based on the voltage relation, so that a high-voltage connector with an HVIL interface and an interlocking cable do not need to be arranged, the wiring difficulty inside the equipment is reduced, and the occupied volume and the detection cost of the high-voltage interlocking system are also reduced.

While the above embodiments have been described with the controllers being implemented by the VCU and the BMC, in other embodiments, the controllers may be separate controllers integrated within the high voltage distribution box. At the moment, the controller receives a CAN signal sent by the BMC to acquire the output voltage of the power battery pack, receives a CAN signal sent by the high-voltage loop to acquire the input voltage of the high-voltage loop, and receives a CAN signal sent by the high-voltage device to acquire the input voltage of the high-voltage device. It will be appreciated that the functionality of the high voltage interlock system is now integrated within the high voltage distribution box, as described in greater detail below with reference to the figures.

Referring to fig. 6, a schematic diagram of a high voltage distribution box according to an embodiment of the present application is shown.

The high voltage distribution box 20 includes: the device comprises an input end, a direct current bus 201, a controller and at least two groups of output ends;

the input end of the high voltage distribution box 20 is used for connecting a power battery pack. The input terminals of the high voltage distribution box 20 include a positive input terminal and a negative input terminal. Wherein, the positive input end is connected with the positive output end of the power battery pack 101, and the negative input end is connected with the negative output end of the power battery pack 101.

The input end of the high-voltage distribution box 20 is connected with at least two groups of output ends through a direct-current busbar. Each set of output ports 202 includes a positive output port and a negative output port. The output end is used for connecting the input end of the high-voltage loop and the input end of the high-voltage device.

The controller 90 determines that the interlock fault exists in the high voltage circuit based on the output voltage of the power battery pack and the input voltage of the high voltage circuit, and determines whether the interlock fault exists in the high voltage device based on the output voltage of the power battery pack and the input voltage of the high voltage device.

The illustrated high-voltage circuit includes a dc charging circuit 301, an ac charging circuit 302, and an external discharging circuit 303. Each high-voltage loop comprises a direct-current bus bar. The direct-current busbar of the high-voltage circuit comprises a positive direct-current busbar and a negative direct-current busbar, wherein the positive direct-current busbar is connected with a positive input port of the high-voltage circuit, and the negative direct-current busbar is connected with a negative input port of the high-voltage circuit. The input voltage of the high-voltage loop is the voltage of the direct-current busbar input into the high-voltage loop through the input end of the high-voltage loop.

The detection circuit and the controller included in the high-voltage loop can detect the magnitude of the input voltage, and the detection data of the input voltage of the high-voltage loop is directly utilized to judge the interlocking fault in the embodiment of the application.

The illustrated high-voltage devices include a motor controller 30, a DC-DC circuit 50, a battery heater 403, a passenger compartment heater 404, an air conditioner compressor 405, and the like. Each high-voltage device comprises a direct-current bus bar. The direct-current busbar of the high-voltage device comprises a positive direct-current busbar and a negative direct-current busbar, wherein the positive direct-current busbar is connected with a positive input port of the high-voltage device, the negative direct-current busbar is connected with a negative input port of the high-voltage device, and input voltage is supplied to a load circuit or the load device through the direct-current busbar. The input voltage of the high-voltage device is the voltage of the direct-current busbar input to the high-voltage device through the input end of the high-voltage device.

The detection circuit and the controller included in the high-voltage device can detect the magnitude of the input voltage, and the detection data of the high-voltage advancing input voltage is directly utilized to judge the interlocking fault in the embodiment of the application.

Referring also to fig. 4, the BIC1021 in the BMS is configured to collect the output voltage of the power battery pack and transmit the voltage information to the BMC1022 in the BMS. The BMC1022 sends a CAN signal to the controller 90 carrying voltage information to cause the controller 90 to determine the output voltage of the power battery pack.

The controller 90 receives a CAN signal sent by the high-voltage loop to obtain the input voltage of the high-voltage loop, and the controller 90 receives a CAN signal sent by the high-voltage device to obtain the input voltage of the high-voltage device.

In some embodiments, when the difference between the output voltage of the power battery pack and the input voltage of the high-voltage circuit is greater than the preset threshold, the controller 90 determines that there is an interlock fault in the high-voltage circuit, that is, determines that there may be a problem such as loose connection in the high-voltage circuit at this time.

In order to avoid misjudging that the interlock fault occurs in the high-voltage circuit, when it is determined that the difference is greater than the preset threshold and the duration exceeds the preset time, the controller 90 determines that the interlock fault occurs in the high-voltage circuit.

In other embodiments, the controller 90 may also determine that there is an interlock fault in the high-voltage circuit when the ratio of the output voltage of the power battery pack to the input voltage of the high-voltage circuit is greater than a preset ratio.

Further, when it is determined that the interlock fault exists in the high-voltage circuit, the controller 90 may further perform a power-off operation on the high-voltage circuit, or may give an alarm in time to instruct the driver to perform the power-off operation on the high-voltage circuit.

When the difference between the output voltage of the power battery pack and the input voltage of the high-voltage device is greater than the preset threshold, the controller 90 determines that the high-voltage device has an interlock fault, that is, determines that the high-voltage device may have problems such as loose connection at the time.

In order to avoid misjudging that the high-voltage device has the interlocking fault, the controller 90 determines that the interlocking fault exists in the high-voltage device when the difference is greater than the preset threshold and the duration time exceeds the preset time.

In other embodiments, the controller 90 may also determine that the interlock fault exists in the high-voltage device when the ratio of the output voltage of the power battery pack to the input voltage of the high-voltage device is greater than a preset ratio.

When the controller 90 determines that the interlock fault occurs in the dc charging circuit 301, the ac charging circuit 302, and the external discharging circuit 303, the electric vehicle is in a stationary state at this time, and thus the high-voltage circuit can be directly controlled to be powered down. For high-voltage devices such as a DC-DC circuit and a motor controller, the vehicle may be in a driving state during power-on operation, so to ensure safety of the electric vehicle, in an optimal implementation manner, when the controller 90 determines that the high-voltage device has an interlock fault, the controller may further perform power limitation operation on the high-voltage device, or perform an alarm in time to instruct a driver to perform power-off operation on the high-voltage device, thereby reserving time for performing power-off operation for the driver.

To sum up, the controller of high voltage distribution box that this application embodiment provided CAN acquire the input voltage of each part high-voltage device and high-voltage circuit in real time through the CAN signal to confirm whether each part high-voltage device and high-voltage circuit have the connection fault according to the input voltage who acquires and the output voltage of power battery group, CAN realize the accurate positioning of connection fault, be convenient for maintain and troubleshooting. In addition, because the high-voltage distribution box judges the interlocking state based on the voltage relation, a high-voltage connector with an HVIL interface and an interlocking cable do not need to be arranged, the wiring difficulty in the equipment is reduced, and the occupied volume and the detection cost are also reduced.

Based on the high-voltage interlock system provided by the above embodiments, the embodiments of the present application further provide an electric drive system, which is specifically described below with reference to the accompanying drawings.

Referring to fig. 7, a schematic diagram of an electric drive system according to an embodiment of the present application is shown.

The electric drive system 700 includes the high-voltage interlock system 200 provided in the above embodiment, and further includes the high-voltage circuit 300 and the high-voltage device 400.

The high voltage interlock system 200 includes a high voltage distribution box 20 and a controller 90. The high voltage distribution box 20 includes a dc bus bar 201 and at least two sets of output terminals.

For the specific implementation and operation principle of the high-voltage interlock system 200, reference may be made to the relevant descriptions in the above embodiments, and the embodiments of the present application are not described herein again.

An input of the high voltage circuit 300 and an input of the high voltage device 400 for connecting to an output of the high voltage distribution box 20.

The high voltage circuit 300 in the embodiment of the present application may include at least one of an ac charging circuit, a dc charging circuit, or an external discharging circuit.

The high voltage device 400 includes at least one of a motor controller, a dc-dc circuit, or a battery heater.

The embodiments of the present application do not limit the specific implementation manner of the high voltage circuit 300 and the high voltage device 400.

To sum up, the high-voltage interlocking system of the electric drive system provided by the embodiment of the application acquires the input end voltages of the high-voltage devices and the high-voltage loop of each part in real time through the CAN signal, and determines whether the high-voltage devices and the high-voltage loop have connection faults or not according to the acquired input end voltages and the output voltage of the power battery pack, so that the accurate positioning of the connection faults CAN be realized, and the maintenance and the fault removal are facilitated. In addition, the high-voltage interlocking system judges the interlocking state based on the voltage relation, so that a high-voltage connector with an HVIL interface and an interlocking cable do not need to be arranged, the wiring difficulty inside the equipment is reduced, the occupied volume and the detection cost of the high-voltage interlocking system are also reduced, and the volume and the cost of an electric drive system are further reduced.

Based on the high-voltage distribution box provided by the above embodiments, the embodiments of the present application further provide an electric drive system, which is specifically described below with reference to the accompanying drawings.

Referring to FIG. 8, a schematic diagram of another electric drive system provided in accordance with an embodiment of the present application is shown.

The electric drive system 700 includes the high voltage distribution box 20 provided in the above embodiment, and further includes the high voltage circuit 300 and the high voltage device 400.

The high voltage distribution box 20 includes: the device comprises an input end, a direct current bus bar 201, a controller and at least two groups of output ends 202.

For a specific implementation manner and an operation principle of the high voltage distribution box 20, reference may be made to the description in the above embodiments, and the description of the embodiments is not repeated here.

According to the controller of the high-voltage distribution box, the input end voltage of each high-voltage device and each high-voltage loop is acquired in real time through the CAN signal, whether the connection fault exists in each high-voltage device and each high-voltage loop is determined according to the acquired input end voltage and the output voltage of the power battery pack, the accurate positioning of the connection fault CAN be achieved, and the maintenance and the fault removal are facilitated. In addition, the high-voltage interlocking system judges the interlocking state based on the voltage relation, so that a high-voltage connector with an HVIL interface and an interlocking cable do not need to be arranged, the wiring difficulty inside the equipment is reduced, the occupied volume and the detection cost of a high-voltage distribution box are also reduced, and the volume and the cost of an electric drive system are further reduced.

The embodiment of the present application further provides a high voltage interlock detection method, which can be applied to the high voltage interlock system or the high voltage distribution box provided in the above embodiments, and is specifically described below with reference to the accompanying drawings.

Referring to fig. 9, the figure is a schematic diagram of a high-voltage interlock detection method provided in an embodiment of the present application.

The detection method comprises the following steps:

s901: and acquiring the output voltage of the power battery pack, the input voltage of the high-voltage loop and the input voltage of the high-voltage device.

The battery management system, the high-voltage loop and the high-voltage device of the electric vehicle are communicated through the CAN signal, so that the output voltage of the power battery pack, the input voltage of the high-voltage loop and the input voltage of the high-voltage device CAN be determined according to the voltage information in the CAN signal.

S902: and when the difference value between the output voltage of the power battery pack and the input voltage of the high-voltage loop is greater than a preset threshold value, determining that the high-voltage loop has an interlocking fault.

The input voltage of the high-voltage circuit is reduced, and the high-voltage circuit is characterized to have an interlocking fault at the moment, namely the problem of connection loosening and the like can occur.

In other embodiments, the interlock fault is determined to exist in the high-voltage circuit when a ratio of the output voltage of the power battery pack to the input voltage of the high-voltage circuit is greater than a preset ratio.

S903: and when the difference value between the output voltage of the power battery pack and the input voltage of the high-voltage device is larger than a preset threshold value, determining that the high-voltage device has an interlocking fault.

The input voltage of the high-voltage device is reduced, and the high-voltage device is characterized to have an interlocking fault at the moment, namely the problem of connection loosening and the like can occur.

In other embodiments, the interlock fault is determined to exist in the high-voltage device when a ratio of the output voltage of the power battery pack to the input voltage of the high-voltage device is greater than a preset ratio.

S904: and when the interlocking fault of the high-voltage circuit is determined, performing power-down operation on the high-voltage circuit.

S905: and when the interlocking fault of the high-voltage device is determined, performing power limiting operation on the high-voltage device.

The high-voltage circuit provided by the embodiment of the application can comprise at least one of an alternating current charging circuit, a direct current charging circuit or an external discharging circuit.

The high voltage device includes at least one of a motor controller, a dc-dc circuit, a battery heater, an air conditioning compressor, or a passenger compartment heater.

When the direct current charging circuit, the alternating current charging circuit and the external discharging circuit are determined to have interlocking faults, the electric vehicle is in a static state at the moment, so that the power-off of the high-voltage circuit can be directly controlled while alarming is carried out, and the faults can be removed in time. For high-voltage devices such as a DC-DC circuit and a motor controller, the vehicle may be in a running state during power-on operation, so that in order to ensure the safety of the electric vehicle, in a better implementation manner, when the high-voltage devices are determined to have an interlocking fault, the high-voltage devices are subjected to power limitation operation, or an alarm is given in time to indicate a driver to perform power-off operation on the high-voltage devices, so that the time for performing power-off operation during parking is reserved for the driver.

The division and the sequence of the steps are only for convenience of description and do not limit the method of the embodiment. For example, S902 and S903 may be interchanged and S904 and S905 may be interchanged.

In summary, by using the method provided by the embodiment of the present application, the input end voltages of the high-voltage devices and the high-voltage circuit of each part are obtained in real time through the CAN signal, and whether a connection fault exists in the high-voltage devices and the high-voltage circuit of each part is determined according to the obtained input end voltages and the output voltage of the power battery pack, so that the connection fault CAN be accurately located, and the maintenance and fault removal are facilitated. The method judges the interlocking state based on the voltage relationship, so that a high-voltage connector with an HVIL interface and an interlocking cable do not need to be arranged on hardware, the wiring difficulty inside the equipment is reduced, and the occupied volume and the detection cost of a high-voltage interlocking system are also reduced.

Based on the electric drive system provided by the above embodiment, the embodiment of the present application further provides a power assembly, which is specifically described below with reference to the accompanying drawings.

Referring to fig. 10, a schematic diagram of a powertrain according to an embodiment of the present application is shown.

The illustrated powertrain 900 includes an electric drive system 700 and also includes an electric motor 40.

Electric drive system 700 includes, among other things, high-voltage interlock system 200, high-voltage circuit 300, and high-voltage device 400.

For the specific implementation and operation principle of the high-voltage interlock system, reference may be made to the relevant description in the above embodiments, and the description of the embodiments is not repeated here.

The powertrain's electric machine 40 is used to convert electrical energy into mechanical energy to drive the electric vehicle.

In some embodiments, a motor controller is included in high voltage device 400, and an output of the motor controller is connected to an input of motor 40.

The motor controller is used to convert the dc power to ac power and provide it to the motor 40. The motor controller includes an inverter circuit for implementing dc-ac conversion, and the inverter circuit may be a two-level inverter circuit or a three-level inverter circuit, which is not limited in this embodiment.

Referring to FIG. 11, another powertrain schematic provided by an embodiment of the present application is shown.

Electric drive system 700 includes high voltage distribution box 20, high voltage circuit 300, and high voltage device 400.

For specific implementation and operation principle of the high-voltage distribution box, reference may be made to the relevant description in the above embodiments, and details of the present embodiment are not repeated herein.

The drive train of fig. 11 differs from that of fig. 10 in that the controller is integrated in the high voltage distribution box 90.

Based on the power assembly provided by the above embodiment, the embodiment of the present application further provides an electric vehicle, which is specifically described below with reference to the accompanying drawings.

Referring to fig. 12, the figure is a schematic view of an electric vehicle according to an embodiment of the present application.

The illustrated electric vehicle 1000 includes the powertrain 900 provided in the above embodiment, and further includes the power battery pack 101.

In some embodiments, the power assembly 900 includes a high-voltage interlock system, a high-voltage circuit, and a high-voltage device, where the high-voltage interlock system includes a high-voltage distribution box and a controller, and for specific implementation and operation principle of the high-voltage interlock system, reference may be made to the relevant description in the above embodiments, and details are not repeated here.

In other embodiments, the power assembly 900 includes a high-voltage distribution box, a high-voltage circuit and a high-voltage device, and the controller of the high-voltage distribution box may implement detection of the interlock fault, and for specific implementation and operation principle of the high-voltage distribution box, reference may be made to the relevant description in the above embodiments, and details are not repeated herein.

The output end of the power battery pack 101 is connected with the input end of the high-voltage distribution box.

The power battery pack 101 is used for inputting direct current to the powertrain.

In summary, the electric vehicle can determine whether a connection fault exists in each high-voltage device and each loop by acquiring the input end voltage of each high-voltage device and each loop in real time and comparing the acquired input end voltage with the output voltage of the power battery pack, so that the connection fault can be accurately positioned, and the maintenance and fault removal are facilitated. Therefore, a high-voltage connector with an HVIL interface and a cable are not needed in hardware, the occupied volume and the cost of the power assembly are reduced, and the cost of the electric vehicle is further reduced.

It should be understood that in the present application, "at least one" means one or more, "a plurality" means two or more. "and/or" for describing an association relationship of associated objects, indicating that there may be three relationships, e.g., "a and/or B" may indicate: only A, only B and both A and B are present, wherein A and B may be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of single item(s) or plural items. For example, at least one (one) of a, b, or c, may represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", wherein a, b, c may be single or plural.

The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. The above-described apparatus embodiments are merely illustrative, and the units and modules described as separate components may or may not be physically separate. In addition, some or all of the units and modules may be selected according to actual needs to achieve the purpose of the solution of the embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.

The foregoing is directed to embodiments of the present application and it is noted that numerous modifications and adaptations may be made by those skilled in the art without departing from the principles of the present application and are intended to be within the scope of the present application.

Claims

1. A high voltage interlock system having an input for connection to a power battery pack, the high voltage interlock detection system comprising: a high voltage distribution box and a controller; wherein,

the high-voltage distribution box comprises a direct-current busbar and at least two groups of output ends;

the input end of the high-voltage distribution box is the input end of the high-voltage interlocking system, and the input end of the high-voltage distribution box is connected with the at least two groups of output ends through the direct-current busbar;

the at least two groups of output ends are used for connecting the input end of the high-voltage loop and the input end of the high-voltage device;

the controller is used for determining whether the interlocking fault exists in the high-voltage loop according to the output voltage of the power battery pack and the input voltage of the high-voltage loop; and determining whether the high-voltage device has an interlocking fault according to the output voltage of the power battery pack and the input voltage of the high-voltage device.

2. The high-voltage interlock system according to claim 1, wherein the controller is specifically configured to determine that an interlock fault exists in the high-voltage circuit when a difference between an output voltage of the power battery pack and an input voltage of the high-voltage circuit is greater than a preset threshold; and when the difference value between the output voltage of the power battery pack and the input voltage of the high-voltage device is larger than the preset threshold value, determining that the high-voltage device has an interlocking fault.

3. The high-voltage interlock system according to claim 1 or 2, wherein the controller is a Vehicle Control Unit (VCU);

the VCU receives a Controller Area Network (CAN) signal sent by a Battery Management Controller (BMC) to acquire the output voltage of the power battery pack, the VCU receives the CAN signal sent by the high-voltage loop to acquire the input voltage of the high-voltage loop, and the VCU receives the CAN signal sent by the high-voltage device to acquire the input voltage of the high-voltage device.

4. The high voltage interlock system of claim 1 or 2, wherein the controller is a battery management controller, BMC;

the BMC receives voltage information sent by a battery information collector BIC to acquire output voltage of the power battery pack, receives a CAN signal sent by the high-voltage loop to acquire input voltage of the high-voltage loop, and receives the CAN signal sent by the high-voltage device to acquire the input voltage of the high-voltage device.

5. The high voltage interlock system of claim 1 or 2, wherein the controller is integrated within the high voltage distribution box;

the controller receives a Controller Area Network (CAN) signal sent by a Battery Management Controller (BMC) to acquire the output voltage of the power battery pack, the controller receives the CAN signal sent by the high-voltage loop to acquire the input voltage of the high-voltage loop, and the controller receives the CAN signal sent by the high-voltage device to acquire the input voltage of the high-voltage device.

6. The high voltage interlock system of claim 1, wherein each set of said outputs is integrated into a high voltage connector.

7. The high-voltage interlock system of claim 6, wherein said high-voltage connector is a tamper-resistant high-voltage connector.

8. The high voltage interlock system of claim 1, wherein said controller is further configured to limit power operation of said high voltage device when an interlock fault is determined to exist for said high voltage device; and when the interlocking fault exists in the high-voltage circuit, performing power-off operation on the high-voltage circuit.

9. The high-pressure interlock system according to any one of claims 1-8, wherein the high-pressure circuit comprises at least one of:

an AC charging circuit, a DC charging circuit or an external discharging circuit.

10. The high voltage interlock system according to any one of claims 1-8, the high voltage device comprising at least one of:

a motor controller, a dc-dc circuit, a battery heater, a passenger compartment heater, or an air conditioning compressor.

11. A high voltage distribution box, comprising: the device comprises an input end, a direct current bus, a controller and at least two groups of output ends;

the input end is used for connecting a power battery pack and is connected with the at least two groups of output ends through the direct current busbar;

the controller is used for determining that the interlocking fault exists in the high-voltage loop according to the output voltage of the power battery pack and the input voltage of the high-voltage loop; and determining whether the high-voltage device has an interlocking fault according to the output voltage of the power battery pack and the input voltage of the high-voltage device.

12. The high voltage distribution box according to claim 11, wherein said controller is specifically configured to determine whether there is an interlock fault in said high voltage circuit when a difference between an output voltage of said power battery pack and an input voltage of said high voltage circuit is greater than a preset threshold; and when the difference value between the output voltage of the power battery pack and the input voltage of the high-voltage device is larger than the preset threshold value, determining that the high-voltage device has an interlocking fault.

13. The high voltage distribution box according to claim 11 or 12, wherein said controller receives a Controller Area Network (CAN) signal sent by a Battery Management Controller (BMC) to obtain an output voltage of said power battery pack, said controller receives a CAN signal sent by said high voltage loop to obtain an input voltage of said high voltage loop, and said controller receives a CAN signal sent by said high voltage device to obtain an input voltage of said high voltage device.

14. A high voltage distribution box according to claim 11, wherein each set of said outputs is integrated in one high voltage connector.

15. The high voltage distribution box according to claim 14, wherein said high voltage connector is a tamper-evident high voltage connector.

16. The high voltage distribution box of claim 11, wherein said controller is further configured to perform power limiting operation on said high voltage device upon determining that there is an interlock fault with said high voltage device; and when the interlocking fault exists in the high-voltage circuit, performing power-off operation on the high-voltage circuit.

17. The high voltage distribution box according to any of claims 11-16, wherein said high voltage circuit comprises at least one of:

18. A high voltage distribution box according to any of claims 11-16, wherein a high voltage device comprises at least one of the following:

19. An electric drive system, characterized in that the electric drive system comprises a high voltage interlock system according to any of claims 1-8, further comprising a high voltage circuit and a high voltage device; wherein,

the input end of the high-voltage loop and the input end of the high-voltage device are used for being connected with the output end of the high-voltage distribution box;

the high-voltage circuit comprises at least one of an alternating current charging circuit, a direct current charging circuit or an external discharging circuit;

the high voltage device includes at least one of a motor controller, a dc-dc circuit, or a battery heater.

20. An electric drive system, characterized in that it comprises a high voltage distribution box according to any of claims 11-16, further comprising a high voltage circuit and a high voltage device; wherein,

21. A high voltage interlock detection method, the method comprising:

determining whether an interlocking fault exists in a high-voltage loop according to the output voltage of the power battery pack and the input voltage of the high-voltage loop;

and determining whether the interlocking fault exists in the high-voltage device according to the output voltage of the power battery pack and the input voltage of the high-voltage device.

22. The detection method according to claim 21, further comprising:

and determining the output voltage of the power battery pack, the input voltage of a high-voltage loop and the input voltage of a high-voltage device according to the voltage information in the CAN signal of the controller area network.

23. The detection method according to claim 21 or 22, wherein the determining whether the interlock fault exists in the high-voltage circuit according to the output voltage of the power battery pack and the input voltage of the high-voltage circuit specifically comprises:

when the difference value between the output voltage of the power battery pack and the input voltage of the high-voltage loop is larger than a preset threshold value, determining that the high-voltage loop has an interlocking fault;

the determining whether the interlocking fault exists in the high-voltage device according to the output voltage of the power battery pack and the input voltage of the high-voltage device specifically comprises:

and when the difference value between the output voltage of the power battery pack and the input voltage of the high-voltage device is greater than the preset threshold value, determining that the high-voltage device has an interlocking fault.

24. The detection method according to claim 21, further comprising:

when the interlocking fault exists in the high-voltage device, performing power limiting operation on the high-voltage device;

and when the interlocking fault exists in the high-voltage circuit, performing power-off operation on the high-voltage circuit.

25. A powertrain comprising the electric drive system of claim 19 or 20 and further comprising an electric motor;

the motor is used for converting electric energy provided by the power battery pack into mechanical energy to drive the electric vehicle.

26. An electric vehicle comprising the powertrain of claim 25, and further comprising a power battery pack;

the output end of the power battery pack is used for being connected with the input end of the high-voltage distribution box;

and the power battery pack is used for inputting direct current to the power assembly.