Motor controller, electric driving device, electric driving system and electric equipment

Abstract

The utility model belongs to the technical field of electric driving, and provides a motor controller, an electric driving device, an electric driving system and electric equipment.The motor controller comprises two power modules, a bus capacitor and a direct current connecting piece, and the two power modules are arranged side by side in the first direction; each power module is provided with a first input terminal and a second input terminal which are opposite in polarity, the bus capacitor is located between the two power modules and provided with a first output terminal and a second output terminal, and the direct-current connecting piece is located between the two power modules and stacked with the bus capacitor in the second direction. The direct current connecting piece comprises a first electrode piece and a second electrode piece which are separated and stacked in the second direction, the first electrode piece is electrically connected to the first output terminal and the first input terminals of the two power modules, and the second electrode piece is electrically connected to the second output terminal and the second input terminals of the two power modules. According to the motor controller provided by the embodiment of the invention, stray inductance is reduced, and the performance of the electric driving device is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of electric drive, and more particularly relates to a motor controller, an electric drive device, an electric drive system and an electric device. BACKGROUND

[0002] With the increasing environmental pollution, new energy vehicles are more and more favored by people. The electric drive device is used as a power device of the new energy vehicle to convert the electric energy provided by the battery into mechanical energy to drive the new energy vehicle to travel.

[0003] In the development process of new energy technology, how to improve the performance of the electric drive device is a technical problem to be solved in the new energy technology. CONTENT OF THE INVENTION

[0004] The purpose of the embodiment of the application is to provide a motor controller, an electric drive device, an electric drive system and an electric device to solve the technical problem of poor performance of the electric drive device in the related art.

[0005] To achieve the above purpose, the technical scheme adopted by the embodiment of the application is: a motor controller is provided, comprising: two power modules, which are arranged side by side along a first direction, and each power module is provided with a first input terminal and a second input terminal with opposite polarities; a bus capacitor, which is located between the two power modules, and the bus capacitor is provided with a first output terminal and a second output terminal with opposite polarities; a direct current connecting piece, which is located between the two power modules and is stacked with the bus capacitor along a second direction, the second direction is perpendicular to the first direction, the direct current connecting piece comprises a first electrode piece and a second electrode piece with opposite polarities, the first electrode piece and the second electrode piece are separated and stacked along the second direction, the first electrode piece is electrically connected to the first output terminal and the first input terminals of the two power modules, and the second electrode piece is electrically connected to the second output terminal and the second input terminals of the two power modules.

[0006] The motor controller provided by the embodiment of the present application comprises two power modules, a bus capacitor and a direct-current connecting piece. By arranging the two power modules side by side and placing the bus capacitor between the two power modules, the space can be saved, and the two power modules can be directly electrically connected to the corresponding motor through the alternating-current connecting piece, without the need to bend the alternating-current connecting piece or set a complex wiring harness, thereby reducing the cost of parts and effectively shortening the current transmission path between the motor controller and the motor, so as to effectively reduce the stray inductance generated in the current transmission process. Meanwhile, the direct-current connecting piece is arranged between the two power modules and is stacked with the bus capacitor. The direct-current connecting piece can electrically connect the two power modules and the bus capacitor. The parts in the motor controller are arranged compactly, thereby saving the space. The direct-current connecting piece comprises a first electrode piece and a second electrode piece which are stacked. The direct-current connecting piece has the advantage of low stray inductance. Therefore, the motor controller provided by the embodiment of the present application reduces the stray inductance and is beneficial to improving the performance of the electric drive device.

[0007] In some embodiments, the second electrode piece is located between the first electrode piece and the bus capacitor. The second electrode piece is provided with a first through hole. The first electrode piece is connected to the first output terminal through the first through hole.

[0008] By adopting the above technical solution, the first electrode piece is connected to the first output terminal through the first through hole in the second electrode piece, thereby saving the space occupied by the direct-current connecting piece. In addition, the first electrode piece can be stacked with the second electrode piece except the first through hole to reduce the stray inductance.

[0009] In some embodiments, the direct-current connecting piece further comprises an insulating piece. At least part of the insulating piece is located between the first electrode piece and the second electrode piece. The insulating piece is provided with a second through hole. The second through hole corresponds to and communicates with the first through hole. The first electrode piece is connected to the first output terminal through the first through hole and the second through hole.

[0010] By adopting the above technical solution, the insulating piece can insulate and separate the first electrode piece and the second electrode piece. The insulating piece is provided with a second through hole, so that the first electrode piece can be connected to the bus capacitor through the second through hole and the first through hole.

[0011] In some embodiments, the insulating piece covers at least part of the first electrode piece.

[0012] By adopting the above technical solution, the insulating piece can insulate and separate the first electrode piece and other components in the motor controller, thereby effectively reducing the risk of short circuit of the motor controller and effectively improving the working reliability of the motor controller.

[0013] In some embodiments, the number of the first output terminals and the number of the second output terminals are both plural, the plural first output terminals and the plural second output terminals are alternately and separately arranged along a third direction, the third direction is perpendicular to the second direction and intersects with the first direction; the second electrode piece is provided with plural first through holes arranged along the third direction, each first through hole exposes one first output terminal.

[0014] By adopting the above technical solutions, the structure of the motor controller is relatively compact, and space is saved; the laminated area of the first electrode piece and the second electrode piece is relatively large, and the stray inductance is relatively small.

[0015] In some embodiments, the first input terminal and the second input terminal are located on the side of the power module close to the DC connection piece, the first input terminal and the second input terminal are separately arranged in the first direction; in the second direction, the first input terminal is located on the side of the second input terminal close to the DC connection piece; the first electrode piece is connected to the first input terminals of the two power modules on the two sides thereof along the first direction, and the second electrode piece is connected to the second input terminals of the two power modules on the two sides thereof along the first direction.

[0016] By adopting the above technical solutions, it is convenient to use the DC connection piece to electrically connect with the power module, and the size and the occupied space of the DC connection piece are reduced; the DC connection piece can be adapted to the first input terminal and the second input terminal on the power module, without bending the first electrode piece and the second electrode piece, the manufacturing tolerance of the DC connection piece is small, and the reliability of the motor controller is relatively high.

[0017] In some embodiments, the first electrode piece is provided with an extension on each of the two sides thereof along the first direction, the extension extends to the outside of the second electrode piece along the first direction, and the first electrode piece is connected to the first input terminal through the extension.

[0018] By adopting the above technical solutions, the first electrode piece can be connected to the first input terminals of the two power modules through the extensions on the two sides thereof, the DC connection piece occupies a relatively small space, the structure of the motor controller is compact, and meanwhile, the middle part of the first electrode piece is overlapped with the second electrode piece, so that the stray inductance is reduced.

[0019] In some embodiments, the motor controller further comprises a housing, the two power modules, the DC connection piece and the bus capacitor are arranged in the housing, the bus capacitor comprises a core, and the core is filled in the housing

[0020] By adopting the above technical solutions, the core of the bus capacitor is arranged in the middle of the two power modules in a filling manner, the height of the power module is higher than the height of the core, the space below the power module is fully utilized, and the filling cooling effect is good, so that the volume of the capacitor can be further reduced.

[0021] In some embodiments, the bus capacitor further comprises a first busbar, a second busbar, and an insulating support arranged on the core body, the first busbar and the second busbar are electrically connected with the core body, the first busbar is provided with a first output terminal, the second busbar is provided with a second output terminal, and the first output terminal and the second output terminal are separately arranged on the insulating support.

[0022] By adopting the above technical solutions, the core body is arranged in the shell in a pouring manner, the first output terminal and the second output terminal are arranged on the insulating support and can be exposed outside the pouring glue, and the direct current connecting piece is convenient to connect.

[0023] In some embodiments, along the second direction, the positive projection of the second electrode piece towards the first electrode piece completely falls inside the first electrode piece.

[0024] By adopting the above technical solutions, the stacking area between the first electrode piece and the second electrode piece is large, and the stray inductance of the direct current connecting piece is effectively reduced.

[0025] In some embodiments, the first electrode piece is laser welded to the bus capacitor; and / or, the second electrode piece is laser welded to the bus capacitor.

[0026] By adopting the above technical solutions, the contact resistance is reduced, and the manufacturing process is simplified.

[0027] In some embodiments, the thickness of the first electrode piece and the second electrode piece is equal.

[0028] By adopting the above technical solutions, the installation process is simplified, and the manufacturing yield is improved.

[0029] In some embodiments, the first electrode piece is laser welded to the first input terminal; and / or, the second electrode piece is laser welded to the second input terminal.

[0030] By adopting the above technical solutions, the installation process is simplified, and the contact resistance is reduced.

[0031] In some embodiments, the two opposite surfaces of the first electrode piece along the second direction are planes; and / or, the two opposite surfaces of the second electrode piece along the second direction are planes.

[0032] By adopting the above technical solutions, the first electrode piece and the second electrode piece are both flat pieces, without the need for bending treatment, the manufacturing tolerance is reduced, and the manufacturing yield is improved.

[0033] In some embodiments, along the second direction, the distance between the first electrode piece and the second electrode piece ranges from 0.2mm to 1.5mm.

[0034] By adopting the technical scheme, the first electrode piece and the second electrode piece can be conveniently connected to the power modules respectively, and an interval and insulation can be maintained between the two electrode pieces; the first electrode piece and the second electrode piece are mutually laminated and have a small gap, and the stray inductance is small.

[0035] In some embodiments, the motor controller further comprises a housing, the two power modules, the direct current connecting piece and the bus capacitor are arranged in the housing; the motor controller further comprises two alternating current connecting pieces, the two alternating current connecting pieces are connected to the two power modules in one-to-one correspondence, and one end of the alternating current connecting piece extends to the external environment of the housing and is used for directly electrically connecting the motor.

[0036] By adopting the technical scheme, the motor controller directly electrically connects the alternating current connecting piece to the motor by penetrating the housing, without using a wire harness, an adapter or the like to electrically connect the alternating current connecting piece to the motor, thereby effectively reducing the number of parts of the electric drive device, shortening the current transmission path between the motor controller and the motor, effectively reducing the stray inductance generated in the current transmission process, and effectively improving the performance of the electric drive device using the motor controller.

[0037] In some embodiments, in the first direction, the two alternating current connecting pieces are respectively located on opposite sides of the two power modules.

[0038] By adopting the technical scheme, the two alternating current connecting pieces are arranged on opposite sides of the housing, which can conveniently directly electrically connect the alternating current connecting piece to the motor, saves the cost of the wire harness, further shortens the current transmission path between the motor controller and the motor, and further reduces the stray inductance generated in the current transmission process.

[0039] The embodiments of the present application further provide an electric drive device comprising the motor controller of any one of the above embodiments, a first motor and a second motor, one power module is electrically connected to the first motor, and the other power module is electrically connected to the second motor.

[0040] The electric drive device provided by the embodiments of the present application has at least the following beneficial effects: the electric drive device provided by the embodiments of the present application uses the motor controller of any one of the above embodiments, thereby effectively improving the performance of the electric drive device.

[0041] The embodiments of the present application further provide an electric drive system comprising a battery and the electric drive device of any one of the above embodiments, the battery is electrically connected to the electric drive device.

[0042] The electric drive system provided by the embodiments of the present application has at least the following beneficial effects: the electric drive system provided by the embodiments of the present application uses the electric drive device of any one of the above embodiments, thereby effectively improving the performance of the electric drive system.

[0043] The embodiment of the present application further provides an electric device comprising the electric driving system.

[0044] The electric device provided by the embodiment of the present application has at least the following beneficial effects: the electric device provided by the embodiment of the present application adopts the electric driving system of any one of the above embodiments, thereby effectively improving the performance of the electric device. BRIEF DESCRIPTION OF DRAWINGS

[0045] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor based on these drawings.

[0046] Figure 1 A structural schematic diagram of a vehicle provided by the embodiment of the present application is shown in the figure;

[0047] Figure 2 An explosion structural schematic diagram of a battery provided by the embodiment of the present application is shown in the figure;

[0048] Figure 3 A structural schematic diagram of an electric driving device provided by the embodiment of the present application is shown in the figure;

[0049] Figure 4 A three-dimensional schematic diagram of a motor controller provided by the embodiment of the present application is shown in the figure;

[0050] Figure 5 A three-dimensional schematic diagram of the motor controller from another angle is shown in the figure; Figure 4

[0051] A three-dimensional exploded schematic diagram of the motor controller provided by the embodiment of the present application is shown in the figure after removing the AC electrical connection; Figure 6

[0052] A partial enlarged view of part A in the figure is shown in the figure; Figure 7 Figure 6 A three-dimensional schematic diagram of a DC electrical connection provided by the embodiment of the present application is shown in the figure;

[0053] Figure 8 A side view of the DC electrical connection shown in the figure is shown in the figure;

[0054] Figure 9 Figure 8 A three-dimensional exploded schematic diagram of the DC electrical connection shown in the figure is shown in the figure;

[0055] Figure 10 A three-dimensional exploded schematic diagram of the DC electrical connection shown in the figure is shown in the figure; Figure 8

[0056] A three-dimensional exploded schematic diagram of the DC electrical connection shown in the figure is shown in the figure; Figure 11 Figure 4 ​​​Structure diagram of the shell and bus capacitor in the motor controller shown in the figure;

[0057] Figure 12 For Figure 4 Structure diagram of the shell, bus capacitor, power module and second electrode piece in the motor controller shown in the figure;

[0058] Figure 13 For Figure 4 Three-dimensional diagram of the shell, bus capacitor, power module and DC connection piece in the motor controller shown in the figure.

[0059] In the figure, various reference signs:

[0060] 1, electric drive system; 10, electric drive device; 11, motor controller; 111, shell; 1111, accommodating cavity; 1112, lead-out hole; 112, bus capacitor; 1121, first output terminal; 1122, second output terminal; 1123, first busbar; 1124, second busbar; 1125, insulating support; 113, power module; 1131, first input terminal; 1132, second input terminal; 114, DC connection piece; 1141, first electrode piece; 11411, extension; 11412, first welding point; 1142, second electrode piece; 11421, first through hole; 11422, second welding point; 1143, insulating piece; 11431, second through hole; 115, AC connection piece; 12, first motor; 13, second motor; 20, battery; 21, battery box; 211, first part; 212, second part; 22, battery monomer; 2, vehicle body. DETAILED DESCRIPTION

[0061] In order to make the technical problems, technical solutions and beneficial effects of the present application more clearly understood, the present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0062] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0063] It should be understood that the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only used for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0064] In addition, the terms "first", "second" are only used for description purpose, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0065] The electric drive device is a device for converting electrical energy into mechanical energy. The electric drive device generally includes a motor and a motor controller for converting direct current into alternating current and transmitting the alternating current to the motor to drive the motor to operate, and the motor controller can also be used to control the operation of the motor, such as controlling the speed of the motor.

[0066] More and more new energy vehicles use double-motor drive. In the related art, two power modules are generally used to drive two motors, and the two power modules are arranged adjacent to each other on one side of a bus capacitor. The output copper bars of the bus capacitor can be directly connected to the power modules. However, the output copper bars of the two power modules are close to each other and cannot be directly connected to the motors, but need to be bent or connected to the motors through a complex high-voltage wire harness, resulting in more stray inductance generated during current transmission. At the same time, the positive output copper bar and the negative output copper bar of the bus capacitor are arranged separately and independently, and have more stray inductance, which affects the output performance of the power module. Therefore, the performance of the electric drive device needs to be improved.

[0067] In order to improve the performance of the electric drive device, the motor controller provided by the embodiment of the application can save space and enable two power modules to be directly electrically connected to the corresponding motor through the AC electrical connector by arranging the two power modules side by side and placing the bus capacitor between the two power modules, without bending the output copper bar or setting a complex high-voltage wire harness, thereby reducing the cost of parts and effectively shortening the current transmission path between the motor controller and the motor, thereby effectively reducing the stray inductance generated in the current transmission process. At the same time, the DC electrical connector is arranged between the two power modules and is stacked with the bus capacitor, and the DC electrical connector can electrically connect the two power modules and the bus capacitor, and the parts in the motor controller are arranged more compactly, thereby saving space. The DC electrical connector includes a first electrode and a second electrode, and the first electrode and the second electrode are stacked and can offset each other's stray inductance, thereby the DC electrical connector has the advantage of low stray inductance, which is beneficial to improve the output performance of the power module. Therefore, the motor controller provided by the embodiment of the application reduces the stray inductance, which is beneficial to improve the performance of the electric drive device.

[0068] The technical solutions described in the embodiments of the application are suitable for electric drive devices and electric devices using electric drive devices. The electric device can be, but is not limited to, a vehicle, a ship, a spacecraft, and an electric toy, etc. The vehicle can be a fuel automobile, a gas automobile, or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid electric automobile, or a range extended automobile, etc. The spacecraft includes an airplane, a rocket, a space shuttle, and a spacecraft, etc. The electric toy includes a fixed or mobile electric toy, for example, an electric automobile toy, an electric ship toy, and an electric airplane toy, etc.

[0069] The following embodiments take a vehicle as an example for convenience of description.

[0070] Please refer to Figure 1 , Figure 1A structural schematic diagram of a vehicle is provided in the embodiments of the present application. The vehicle comprises a vehicle body 2, a battery 20 and an electric drive device 10. The vehicle body 2 is a main supporting component of the vehicle, and the vehicle body 2 has a cabin and a passenger cabin, wherein the cabin is used to accommodate the electric drive device 10, and the passenger cabin is used to provide an operating space and a seating space for the driver and passengers. When the vehicle is a front-drive car, the cabin is arranged at the head of the vehicle body 2, i.e., the cabin is a front cabin; when the vehicle is a rear-drive car, the cabin is arranged at the tail of the vehicle body 2, i.e., the cabin is a rear cabin; when the vehicle is a four-wheel drive car, the cabin is divided into a front cabin and a rear cabin, the front cabin is arranged at the head of the vehicle body 2, and the rear cabin is arranged at the tail of the vehicle body 2, and the number of electric drive devices 10 can be two, and the two electric drive devices 10 are arranged in the front cabin and the rear cabin, respectively. The battery 20 and the electric drive device 10 jointly constitute an electric drive system 1 of the vehicle. The battery 20 can be arranged at the bottom, the head or the tail of the vehicle, and the battery 20 can be used to supply power to the electric drive device 10 to drive the electric drive device 10 to operate. The electric drive device 10 is used to convert the electric energy provided by the battery 20 into mechanical energy and output the mechanical energy to the wheels of the vehicle to drive the vehicle to travel.

[0071] Please refer to Figure 2 , Figure 2 An explosion schematic diagram of the battery 20 is provided in the embodiments of the present application. The battery 20 comprises a battery box 21 and a battery monomer 22, and the battery monomer 22 is accommodated in the battery box 21. The battery box 21 is used to provide an accommodation space for the battery monomer 22, and the battery box 21 can adopt various structures. In some embodiments, the battery box 21 can comprise a first part 211 and a second part 212, the first part 211 and the second part 212 are overlapped with each other, and the first part 211 and the second part 212 jointly define an accommodation space for accommodating the battery monomer 22. The second part 212 can be a hollow structure with one end open, and the first part 211 can be a plate structure, and the first part 211 is arranged on the open side of the second part 212 to jointly define the accommodation space with the second part 212; or the first part 211 and the second part 212 can both be hollow structures with one side open, and the open side of the first part 211 is arranged on the open side of the second part 212 to jointly define the accommodation space. Of course, the battery box 21 formed by the first part 211 and the second part 212 can have various shapes, such as a cylinder, a cuboid, etc., which are not limited here.

[0072] In some embodiments, the battery box 21 can be part of the chassis structure of the vehicle. For example, part of the battery box 21 can be at least part of the floor of the vehicle, or part of the battery box 21 can be at least part of the cross beam and the longitudinal beam of the vehicle.

[0073] Of course, in some embodiments, the battery 20 can not include the battery box 21, but a plurality of battery cells 22 are electrically connected, and the whole is assembled into the vehicle through the necessary fixing structure.

[0074] In the battery 20, the battery cells 22 can be multiple, and the multiple battery cells 22 can be connected in series or in parallel or in a mixed connection, where the mixed connection means that the multiple battery cells 22 have both series connection and parallel connection. The multiple battery cells 22 can be directly connected in series or in parallel or in a mixed connection, and then the whole formed by the multiple battery cells 22 is accommodated in the battery box 21. Of course, the battery 20 can also be that the multiple battery cells 22 are first connected in series or in parallel or in a mixed connection to form a battery module, and the multiple battery modules are connected in series or in parallel or in a mixed connection to form a whole, and then accommodated in the battery box 21. The battery 20 can also include other functional components, for example, the battery 20 can also include a busbar for realizing the electrical connection between the multiple battery cells 22.

[0075] Among them, each battery cell 22 can be a secondary battery cell or a primary battery cell, where the secondary battery cell means that the battery cell 22 can be activated by charging after discharging, and the primary battery cell means that the battery cell 22 cannot be activated by charging after the battery cell 22 runs out of power; the battery cell 22 can also be a lithium ion battery cell, a sodium ion battery cell, a sodium lithium ion battery cell, a lithium metal battery cell, a sodium metal battery cell, a lithium sulfur battery cell, a magnesium ion battery cell, a nickel hydrogen battery cell, a nickel cadmium battery cell, a lead-acid battery cell, etc., but not limited thereto. The battery cell 22 can be a cylindrical battery cell, a prismatic battery cell, a soft package battery cell, or a battery cell of other shapes, and the prismatic battery cell includes a square cell, a blade-shaped battery cell, a multi-prismatic battery cell, such as a hexagonal prismatic battery cell, etc., which is not particularly limited in the present application.

[0076] Please refer to Figure 3 , Figure 3 The structure schematic diagram of the electric drive device 10 provided by the embodiments of the present application is shown. The electric drive device 10 includes a motor controller 11, a first motor 12 and a second motor 13. The first motor 12 and the second motor 13 are respectively used to convert the electric energy provided by the battery 20 into mechanical energy. The first motor 12 and the second motor 13 can be, but are not limited to, axial flux motors, radial flux motors, servo motors, brushed motors, brushless motors, etc. During the working process of the electric drive device 10, the rotation speed of the first motor 12 and the rotation speed of the second motor 13 can be the same, and the rotation speed of the first motor 12 and the rotation speed of the second motor 13 can also be different.

[0077] In some embodiments, the first motor 12 is parallel to the rotation shaft of the second motor 13, and the first motor 12 can be coaxial with the second motor 13, i.e., the central axis of the first motor 12 coincides with the central axis of the second motor 13, and the "central axis" of the motor refers to the axial center line of the rotation shaft (or "rotor shaft") of the motor. As an example, the rotation shaft of the first motor 12 is connected to one of the front left wheel and the front right wheel of the vehicle, and the rotation shaft of the second motor 13 is connected to the other of the front left wheel and the front right wheel of the vehicle, or the rotation shaft of the first motor 12 is connected to one of the rear left wheel and the rear right wheel of the vehicle, and the rotation shaft of the second motor 13 is connected to the other of the rear left wheel and the rear right wheel of the vehicle.

[0078] Of course, in other embodiments, the first motor 12 can also be arranged non-coaxially with the second motor 13, i.e., the central axis of the second motor 13 is arranged spaced apart from the central axis of the first motor 12 in any direction perpendicular to the central axis of the first motor 12.

[0079] The motor controller 11 is used to convert the direct current output by the battery 20 into alternating current and deliver the alternating current to the first motor 12 and the second motor 13, and the motor controller 11 can also be used to control the operation of the first motor 12 and the second motor 13, for example, the motor controller 11 is used to control the start-stop, rotation speed, torque, etc. of the first motor 12 and the second motor 13. In other words, the first motor 12, the second motor 13 and the battery 20 are electrically connected to the motor controller 11, and the direct current output by the battery 20 can be delivered to the motor controller 11 through the current transmission path between the battery 20 and the motor controller 11, and after the motor controller 11 converts the direct current into alternating current, the alternating current can be delivered to the first motor 12 and the second motor 13 through the current transmission path between the motor controller 11 and the first motor 12 and the current transmission path between the motor controller 11 and the second motor 13, to drive the first motor 12 and the second motor 13 to operate, at the same time, the control signal of the motor controller 11 can be transmitted to the first motor 12 through the current transmission path between the motor controller 11 and the first motor 12, and can be transmitted to the second motor 13 through the current transmission path between the motor controller 11 and the second motor 13, the operation state signal of the first motor 12 can be transmitted to the motor controller 11 through the current transmission path between the motor controller 11 and the first motor 12, and the operation state signal of the second motor 13 can be transmitted to the motor controller 11 through the current transmission path between the motor controller 11 and the second motor 13, to realize the control of the motor controller 11 on the operation of the first motor 12 and the second motor 13.

[0080] The electric drive device 10 can further comprise a speed change mechanism for transmitting the mechanical energy to the wheels of the vehicle in a manner of changing the rotation speed and torque of the first motor 12 and the rotation speed and torque of the second motor 13, for example, in a manner of reducing the rotation speed and torque of the first motor 12 and the rotation speed and torque of the second motor 13, or in a manner of increasing the rotation speed and torque of the first motor 12 and the rotation speed and torque of the second motor 13. The speed change mechanism can be, but is not limited to, a pinion speed change mechanism, a worm speed change mechanism, a planetary gear speed change mechanism, a stepless speed change mechanism, etc.

[0081] In order to illustrate the technical solutions provided in the present application, the following will be described in detail in combination with specific drawings and embodiments.

[0082] In a first aspect, referring to Figures 4 to 7 The motor controller 11 provided in the embodiments of the present application comprises a bus capacitor 112, two power modules 113, and a direct current connecting piece 114. The two power modules 113 are arranged side by side along a first direction X, and each power module 113 is provided with a first input terminal 1131 and a second input terminal 1132 having opposite polarities. The bus capacitor 112 is located between the two power modules 113, and is provided with a first output terminal 1121 and a second output terminal 1122 having opposite polarities. The direct current connecting piece 114 is located between the two power modules 113 and is stacked with the bus capacitor 112 along a second direction Z perpendicular to the first direction X. The direct current connecting piece 114 comprises a first electrode piece 1141 and a second electrode piece 1142 having opposite polarities, and the first electrode piece 1141 and the second electrode piece 1142 are separated and stacked along the second direction Z. The first electrode piece 1141 is electrically connected to the first output terminal 1121 and the first input terminals 1131 of the two power modules 113, and the second electrode piece 1142 is electrically connected to the second output terminal 1122 and the second input terminals 1132 of the two power modules 113.

[0083] The bus capacitor 112 is used to smooth the bus voltage, reduce voltage fluctuation and noise, and improve the stability and reliability of the motor controller 11. In the present embodiment, the bus capacitor 112 filters the direct current with high-frequency impurities, and then delivers the direct current to the power modules 113 through the direct current connecting piece 114. The bus capacitor 112 is provided with a first output terminal 1121 and a second output terminal 1122, one of which is a positive output terminal and the other of which is a negative output terminal.

[0084] For example, the first output terminal 1121 and the second output terminal 1122 are square-shaped, which is beneficial to increase the contact area between the bus capacitor 112 and the direct current connecting piece 114. The first output terminal 1121 and the second output terminal 1122 can also be circular or other shapes.

[0085] For example, the first output terminal 1121 is a positive connection point, and the second output terminal 1122 is a negative connection point. The first electrode piece 1141 is fixedly and electrically connected to the first output terminal 1121, and the second electrode piece 1142 is fixedly and electrically connected to the second output terminal 1122. In this way, the bus capacitor 112 is electrically connected to the first electrode piece 1141 through the first output terminal 1121, and is electrically connected to the second electrode piece 1142 through the second output terminal 1122.

[0086] The power module 113 is used to convert the direct current output by the battery 20 into alternating current. The power module 113 can be, but is not limited to, a silicon carbide power module 113, an insulated gate bipolar transistor power module 113 (IGBT), etc. Two power modules 113 are arranged side by side in the first direction X in the accommodating cavity 1111. The first direction X can be the length direction or the width direction of the motor controller 11, or can be a direction inclined with respect to the length direction of the motor controller 11. Each power module 113 is provided with a first input terminal 1131 and a second input terminal 1132 having opposite polarities, i.e., one of the first input terminal 1131 and the second input terminal 1132 is a positive input terminal, and the other is a negative input terminal.

[0087] In some embodiments, the motor controller 11 can further include a control module including a main control unit and a driving unit. The main control unit is a core control device of the motor controller 11, and is used to control the operation of the motor, such as the start-stop, speed, torque, etc. of the motor. The driving unit is electrically connected between the main control unit and the power module 113, and is used to convert the logic signal output by the main control unit into a voltage signal and a current signal required for driving the power module 113. The main control unit and the driving unit can be integrated into one whole, or can be separately provided as two electronic modules.

[0088] In some embodiments, the motor controller 11 can further include an alternating current connecting piece 115, which is a component for electrically connecting the power module 113 and the motor. The alternating current connecting piece 115 can be, but is not limited to, a copper bar, a wire, etc.

[0089] In the embodiment, the two power modules 113 are arranged side by side, and the bus capacitor 112 is located between the two power modules 113. The spacing between the two power modules 113 is large, and the two power modules 113 can be directly electrically connected to the two motors distributed on the two sides through the corresponding alternating current connecting pieces 115. The two power modules 113 do not need to be connected to the motors through the bent alternating current copper bars or complex high-voltage wire harnesses, thereby reducing the part cost, saving the space, and reducing the stray inductance generated in the current transmission process.

[0090] The direct current connecting piece 114 is used for electrically connecting the power module 113 and the bus capacitor 112 to provide direct current to the power module 113. In the embodiment, the direct current connecting piece 114 is located between the two power modules 113 along the first direction X, so that the direct current connecting piece 114 simultaneously connects the two power modules 113; and the direct current connecting piece 114 and the bus capacitor 112 are arranged in a stacked manner along the second direction Z, and the second direction Z can be perpendicular or substantially perpendicular to the first direction X. The second direction Z can be the height direction of the motor controller 11. In the embodiment, the direct current connecting piece 114 is located above the bus capacitor 112, and in another embodiment, the direct current connecting piece 114 can also be located below the bus capacitor 112.

[0091] The direct current connecting piece 114 includes a first electrode piece 1141 and a second electrode piece 1142. The polarities of the first electrode piece 1141 and the second electrode piece 1142 are opposite, that is, one of the first electrode piece 1141 and the second electrode piece 1142 is a positive electrode piece, and the other of the first electrode piece 1141 and the second electrode piece 1142 is a negative electrode piece. As an example, the first electrode piece 1141 is a positive electrode piece, and the second electrode piece 1142 is a negative electrode piece.

[0092] The first electrode piece 1141 and the second electrode piece 1142 are arranged in a separated manner, that is, the first electrode piece 1141 and the second electrode piece 1142 do not contact each other, so that the first electrode piece 1141 and the second electrode piece 1142 are insulated from each other.

[0093] The first electrode piece 1141 and the second electrode piece 1142 are arranged in a stacked manner, that is, at least part of the first electrode piece 1141 and at least part of the second electrode piece 1142 are arranged in a stacked manner. In some embodiments, the first electrode piece 1141 and the second electrode piece 1142 both have a sheet structure, and the direct current connecting piece 114 can be a stacked busbar. In some related technologies, the positive and negative electrode connecting copper bars between the power module 113 and the bus capacitor 112 are independent of each other, and the two do not overlap, and the stray inductance is large. The first electrode piece 1141 and the second electrode piece 1142 are arranged in a stacked manner, thereby reducing the stray inductance.

[0094] The first electrode piece 1141 is electrically connected to the first output terminal 1121 and the first input terminal 1131 of the two power modules 113, and the second electrode piece 1142 is electrically connected to the second output terminal 1122 and the second input terminal 1132 of the two power modules 113, so that the DC connecting piece 114 can electrically connect the bus capacitor 112 and each power module 113 respectively, and the bus capacitor 112 can deliver DC power to each power module 113.

[0095] It can be understood that the first electrode piece 1141, the first output terminal 1121 and the first input terminal 1131 have the same polarity, and the second electrode piece 1142, the second output terminal 1122 and the second input terminal 1132 have the same polarity. For example, the first electrode piece 1141, the first output terminal 1121 and the first input terminal 1131 are all positive, and the second electrode piece 1142, the second output terminal 1122 and the second input terminal 1132 are all negative.

[0096] The principle of using the motor controller 11 is that the battery leads the DC power into the motor controller, the bus capacitor 112 smoothes the DC power with high-frequency impurities, and then delivers the DC power to the two power modules 113 through the DC connecting piece 114, so that the power modules 113 can run smoothly; the power modules 113 convert the DC power into three-phase AC power, control through the circuit board, output through the AC connecting piece 115, drive the motor to rotate, and provide power for the new energy vehicle.

[0097] Among them, the DC current output from the bus capacitor 112 enters the DC connecting piece 114 through the first output terminal 1121 and the second output terminal 1122, and then a part of the DC current is input into one power module 113 through the DC connecting piece 114, and the other part of the DC current is input into another power module 113 through the DC connecting piece 114.

[0098] The motor controller 11 provided in the embodiment of the present application comprises two power modules 113, a bus capacitor 112 and a direct current connecting piece 114. By arranging the two power modules 113 side by side and placing the bus capacitor 112 between the two power modules 113, the space can be saved, and the two power modules 113 can be directly electrically connected to the corresponding motor through the alternating current connecting piece 115, without bending the alternating current connecting piece 115 or setting a complex wiring harness, thereby reducing the cost of parts, effectively shortening the current transmission path between the motor controller 11 and the motor, and effectively reducing the stray inductance generated in the current transmission process. Meanwhile, the direct current connecting piece 114 is arranged between the two power modules 113 and stacked with the bus capacitor 112, the direct current connecting piece 114 can electrically connect the two power modules 113 with the bus capacitor 112, and the parts in the motor controller 11 are arranged more compactly, thereby saving space. The first electrode piece 1141 and the second electrode piece 1142 in the direct current connecting piece 114 are stacked, which can offset the stray inductance, the direct current connecting piece 114 has the advantage of low stray inductance, and is beneficial to improving the output performance of the power module 113. Therefore, the motor controller 11 provided in the embodiment of the present application reduces the stray inductance, which is beneficial to improving the performance of the electric drive device 10.

[0099] Please refer to Figures 7 to 10 In some embodiments, the second electrode piece 1142 is located between the first electrode piece 1141 and the bus capacitor 112, and the first through hole 11421 is arranged on the second electrode piece 1142, and the first electrode piece 1141 is connected with the first output terminal 1121 through the first through hole 11421.

[0100] The direct current connecting piece 114 and the bus capacitor 112 are stacked along the second direction Z, that is, the first electrode piece 1141, the second electrode piece 1142 and the bus capacitor 112 are sequentially stacked along the second direction Z. The second electrode piece 1142 can be directly connected to the bus capacitor 112, the first through hole 11421 is arranged on the second electrode piece 1142, the first through hole 11421 can be square, circular, oval or the like, the number of the first through hole 11421 can be one or more, the first through hole 11421 is arranged opposite to the first output terminal 1121 to expose the first output terminal 1121, and the first through hole 11421 is used for connecting the first electrode piece 1141 with the bus capacitor 112.

[0101] By adopting the technical scheme, the first electrode member 1141, the second electrode member 1142 and the bus capacitor 112 are sequentially stacked, the second electrode member 1142 is directly connected to the second output terminal 1122 on the bus capacitor 112, and the first electrode member 1141 is connected to the first output terminal 1121 through the first through hole 11421 on the second electrode member 1142, thereby saving the space occupied by the direct current connecting member 114, and the first electrode member 1141 can be stacked with the region of the second electrode member 1142 except the first through hole 11421 to reduce the stray inductance.

[0102] In some embodiments, the first output terminal 1121 and the second output terminal 1122 are both located in the middle of one side of the bus capacitor 112, the first electrode member 1141 is connected to the first output terminal 1121 through the first through hole 11421, and the second electrode member 1142 is attached to the bus capacitor 112 and directly connected to the second output terminal 1122.

[0103] In other embodiments, the first output terminal 1121 can also extend to the outside of the second electrode member 1142 to facilitate the connection of the first electrode member 1141.

[0104] In some embodiments, the direct current connecting member 114 further includes an insulating member 1143, at least part of the insulating member 1143 is located between the first electrode member 1141 and the second electrode member 1142, the insulating member 1143 is provided with a second through hole 11431 corresponding to and communicating with the first through hole 11421, and the first electrode member 1141 is connected to the first output terminal 1121 through the first through hole 11421 and the second through hole 11431.

[0105] The insulating member 1143 is a component for insulating and separating the first electrode member 1141 and the second electrode member 1142. The insulating member 1143 can be insulating plastic, insulating paper, etc.

[0106] At least part of the insulating member 1143 is located between the first electrode member 1141 and the second electrode member 1142, the insulating member 1143 is provided with a second through hole 11431 corresponding to and communicating with the first through hole 11421, so that the first electrode member 1141 can be connected to the first output terminal 1121 on the bus capacitor 112 through the second through hole 11431 and the first through hole 11421.

[0107] By adopting the technical scheme, the insulating member 1143 can insulate and separate the first electrode member 1141 and the second electrode member 1142, the insulating member 1143 is provided with a second through hole 11431, so that the first electrode member 1141 can be connected to the bus capacitor 112 through the second through hole 11431 and the first through hole 11421.

[0108] In some embodiments, the insulating member 1143 covers at least part of the first electrode member 1141.

[0109] In some embodiments, the insulating member 1143 can be integrally formed by an injection molding process. For example, the insulating member 1143 can be formed on the first electrode member 1141 by an injection molding process, or the insulating member 1143 can be formed on the first electrode member 1141 and the second electrode member 1142 by an injection molding process and separates the first electrode member 1141 from the second electrode member 1142. Alternatively, the insulating member 1143 can be separately formed by an injection molding process, and then the insulating member 1143 is assembled with the first electrode member 1141 and the second electrode member 1142.

[0110] The first electrode member 1141 is used to connect the part of the bus capacitor 112 and the part used to connect the power module 113, and the rest of the first electrode member 1141 is covered inside the insulating member 1143.

[0111] By using the above technical solution, the insulating member 1143 can insulate the first electrode member 1141 from the second electrode member and other components in the motor controller 11, effectively reducing the risk of short circuit of the motor controller 11, thereby effectively improving the working reliability of the motor controller 11.

[0112] In some embodiments, the number of the first output terminals 1121 and the second output terminals 1122 is multiple, and the multiple first output terminals 1121 and the multiple second output terminals 1122 are alternately and separately arranged along a third direction Y, the third direction Y being perpendicular to the second direction Z and intersecting the first direction X; the second electrode member 1142 is provided with multiple first through holes 11421 arranged along the third direction Y, and each first through hole 11421 exposes one first output terminal 1121.

[0113] For example, the third direction Y is perpendicular to the first direction X, and the third direction Y is, for example, the width direction of the motor controller 11. It can be understood that the third direction Y can also be obliquely intersected with the first direction X.

[0114] For example, the first electrode member 1141 includes multiple first connecting portions, the multiple first connecting portions are one-to-one connected with the multiple first output terminals 1121, and the first connecting portion is a region of the first electrode member 1141 exposed by the first through hole 11421 and the second through hole; the second electrode member 1142 includes multiple second connecting portions, the multiple second connecting portions are one-to-one connected with the multiple second output terminals 1122, and the multiple second connecting portions are separately arranged by the first through hole 11421.

[0115] Optionally, the first electrode piece 1141 is provided with a plurality of third through holes (not shown in the figure), the third through holes separate the plurality of first connecting portions on the first electrode piece 1141 from each other, and the third through holes are capable of being inserted by the insulating structure, further reducing the risk of short circuit.

[0116] As shown in Figure 11 , the bus capacitor 112 is alternately provided with three first output terminals 1121 and four second output terminals 1122 along the third direction Y, as shown in Figure 10 , the second electrode piece 1142 is provided with three first through holes 11421, each of which exposes a first output terminal 1121. It can be understood that the first output terminals 1121 and the second output terminals 1122 can also be other quantities, for example, the second output terminals 1122 are three.

[0117] Please refer to Figures 10 to 13 , during assembly, the second electrode piece 1142 is first fixed on the bus capacitor 112, so that the second electrode piece 1142 is electrically connected with the plurality of second output terminals 1122, and the two sides of the second electrode piece 1142 are respectively electrically connected with the second input terminals 1132 of the two power modules 113; then the first electrode piece 1141 is fixed on the bus capacitor 112, so that the first electrode piece 1141 is electrically connected with the plurality of first output terminals 1121 through the first through holes 11421, and the two sides of the first electrode piece 1141 are respectively electrically connected with the first input terminals 1131 of the two power modules 113.

[0118] By adopting the above technical solutions, the plurality of first output terminals 1121 and the plurality of second output terminals 1122 are arranged along the third direction Y, which can make the structure of the motor controller 11 more compact and save space; the first electrode piece 1141 is connected to the plurality of first output terminals 1121 on the bus capacitor 112 through the plurality of first through holes 11421 on the second electrode piece 1142, the layering area of the first electrode piece 1141 and the second electrode piece 1142 is large, and the stray inductance is small; and the connection reliability between the first electrode piece 1141, the second electrode piece 1142 and the bus capacitor 112 is high.

[0119] Please refer to Figure 4 , Figure 6 , Figure 7In some embodiments, the first input terminal 1131 and the second input terminal 1132 are arranged on the side of the power module 113 close to the DC connector 114, and the first input terminal 1131 and the second input terminal 1132 are arranged in the first direction X; in the second direction Z, the first input terminal 1131 is located on the side of the second input terminal 1132 close to the DC connector 114; the first electrode 1141 is connected to the first input terminal 1131 of the two power modules 113 on both sides in the first direction X, and the second electrode 1142 is connected to the second input terminal 1132 of the two power modules 113 on both sides in the first direction X.

[0120] One of the first input terminal 1131 and the second input terminal 1132 is a positive terminal, and the other is a negative terminal, and each power module 113 is provided with three positive terminals and three negative terminals. As an example, the first electrode 1141 is a positive electrode, and the first input terminal 1131 is a positive terminal, and the second electrode 1142 is a negative electrode, and the second input terminal 1132 is a negative terminal.

[0121] As an example, the three extensions 11411 on one side of the first electrode 1141 are connected to the three first input terminals 1131 in one-to-one correspondence in one of the power modules 113.

[0122] In this embodiment, the two power modules 113 are arranged side by side, and the first input terminal 1131 and the second input terminal 1132 are located on the side of the power module 113 close to the DC connector 114, and the two power modules 113 can be considered as mirror arrangement.

[0123] By adopting the above technical scheme, the bus capacitor 112 delivers DC power to the power module 113 through the DC connector 114, and since the first input terminal 1131 and the second input terminal 1132 are arranged on the side of the power module 113 close to the bus capacitor 112 and the DC connector 114, it is convenient to use the DC connector 114 to electrically connect with the power module 113, and the size and space occupied by the DC connector 114 are reduced.

[0124] The first input terminal 1131 and the second input terminal 1132 are arranged in the first direction X, so that the first input terminal 1131 is connected to the first electrode 1141 and the second input terminal 1132 is connected to the second electrode 1142, and interference is not easy to occur.

[0125] In the second direction Z, the first input terminal 1131 is located on the side of the second input terminal 1132 close to the DC connector 114, that is, the height of the first input terminal 1131 is higher than the height of the second input terminal 1132, and correspondingly, the height of the first electrode 1141 is higher than the height of the second electrode 1142, so that the DC connector 114 can be adapted to the input terminals on the power module 113.

[0126] By adopting the above technical solution, the DC connector 114 can be adapted to the first input terminal 1131 and the second input terminal 1132 on the power module 113, facilitating the connection of the DC connector 114 and the power module 113, without the need to bend the first electrode 1141 and the second electrode 1142, so that the manufacturing tolerance of the DC connector 114 is small and the reliability of the motor controller 11 is high.

[0127] Please refer to Figures 6 to 10 In some embodiments, the first electrode 1141 is provided with an extension 11411 on each side in the first direction X, the extension 11411 extends to the outside of the second electrode 1142 in the first direction X, and the first electrode 1141 is connected to the first input terminal 1131 through the extension 11411.

[0128] The extension 11411 is the part of the first electrode 1141 extending to the outside of the second electrode 1142 in the first direction X. The extension 11411 is fixedly connected to the first input terminal 1131 and electrically connected to the first input terminal 1131, and the extension 11411 is the part of the first electrode 1141 for connecting the output terminal of the power module 113.

[0129] In order to connect the power module 113, the extension 11411 is located outside the insulating member 1143. The shape of the extension 11411 can be, but is not limited to, a square, a trapezoid, a dovetail shape, etc. The extension 11411 is fixedly connected to and electrically connected to the power module 113.

[0130] In this embodiment, the first electrode 1141 is provided with three extensions 11411 on each side in the first direction X, and the three extensions 11411 are connected to the three first input terminals 1131 of the power module 113 one by one.

[0131] Since the first electrode piece 1141 and the second electrode piece 1142 are arranged in a stacked manner, by arranging the extension portions 11411 on both sides of the first electrode piece 1141 respectively, the first electrode piece 1141 can be connected to the first input terminals 1131 of the two power modules 113 respectively through the extension portions 11411 on both sides thereof, the space occupied by the direct current connecting piece 114 is smaller, and the structure of the motor controller 11 is compact. Meanwhile, the middle part of the first electrode piece 1141 is arranged in an overlapping manner with the second electrode piece 1142, thereby reducing the stray inductance.

[0132] In some embodiments, the motor controller 11 further includes a housing 111, and the two power modules 113, the direct current connecting piece 114 and the bus capacitor 112 are all arranged in the housing 111. The bus capacitor 112 includes a core, and the core is potted in the housing 111.

[0133] The housing 111 is a component for providing an internal installation environment of the motor controller 11. An opening can be arranged on the housing 111, and the components such as the power module 113 can be assembled into the internal installation environment of the motor controller 11 through the opening. The housing 111 can be a one-piece component or an assembled component assembled by multiple parts. The material of the housing 111 can be, but is not limited to, copper, iron, aluminum, stainless steel, aluminum alloy, etc. At least part of the space in the internal installation environment of the motor controller 11 constitutes the above-mentioned accommodating cavity 1111, and the accommodating cavity 1111 is used to accommodate the components such as the power module 113.

[0134] In some embodiments, the motor controller 11 can further include a cover, and the cover is arranged on the opening side of the housing 111 to isolate the above-mentioned internal installation environment from the external environment of the housing 111. The cover can be connected to the housing 111 integrally, for example, the cover and the housing 111 are welded into one whole after the cover is arranged on the housing 111, or the cover can be detachably connected to the housing 111, for example, the cover and the housing 111 are connected through fasteners such as screws, etc. The material of the cover can be, but is not limited to, copper, iron, aluminum, stainless steel, aluminum alloy, etc.

[0135] The core is the core component of the bus capacitor 112, and the number of the core can be one or multiple. The core can be fixed in the housing 111 by potting glue. Specifically, the core can be placed in the housing 111 first, and then the potting glue is injected into the housing 111, and after the potting glue solidifies, the core is fixed in the housing 111. After the core is fixed, the power module 113 is assembled in the housing 111, and the power module 113 is located on the upper side of the bus capacitor 112, and then the direct current connecting piece 114 is assembled. It can be understood that after the core is potted in the housing 111, the potting glue exposes the first output terminal 1121 and the second output terminal 1122.

[0136] By adopting the technical scheme, the core of the bus capacitor 112 is arranged in the two power modules 113 in a pouring manner, the height of the power module 113 is higher than the height of the core, the space below the power module 113 is fully utilized, and the pouring cooling effect is good, and the volume of the capacitor can be further reduced.

[0137] In some embodiments, the bus capacitor 112 further comprises a first busbar 1123, a second busbar 1124, and an insulating support 1125 arranged on the core, the first busbar 1123 and the second busbar 1124 are electrically connected with the core, the first output terminal 1121 is arranged on the first busbar 1123, the second output terminal 1122 is arranged on the second busbar 1124, and the first output terminal 1121 and the second output terminal 1122 are arranged separately on the insulating support 1125.

[0138] For example, the plurality of first output terminals 1121 and the plurality of second output terminals 1122 are arranged at intervals along the third direction Y on the insulating support 1125, and an insulating protruding rib can be arranged on the insulating support 1125 to separate adjacent first output terminals 1121 and second output terminals 1122.

[0139] By adopting the technical scheme, the core is arranged in the shell 111 in a pouring manner, the first output terminal 1121 and the second output terminal 1122 are arranged on the insulating support 1125 and can be exposed outside the pouring glue, and the direct current connecting piece 114 is convenient to connect.

[0140] In some embodiments, along the second direction Z, the orthographic projection of the second electrode piece 1142 towards the first electrode piece 1141 falls completely inside the first electrode piece 1141.

[0141] The first electrode piece 1141 can completely cover the second electrode piece 1142, the stacking area between the first electrode piece 1141 and the second electrode piece 1142 is large, and the stray inductance of the direct current connecting piece 114 is effectively reduced.

[0142] In other embodiments, the orthographic projection of the second electrode piece 1142 towards the first electrode piece 1141 can also partially fall inside the first electrode piece 1141.

[0143] In some embodiments, the first electrode piece 1141 is laser welded to the bus capacitor 112; and / or, the second electrode piece 1142 is laser welded to the bus capacitor 112.

[0144] Since the first electrode piece 1141 and the second electrode piece 1142 are both stacked on one side of the bus capacitor 112, the overlapping part of the first electrode piece 1141 and the bus capacitor 112 can be connected by laser welding, and the overlapping part of the second electrode piece 1142 and the bus capacitor 112 can also be connected by laser welding.

[0145] In some embodiments, the first electrode piece 1141 is connected to the first output terminal 1121 of the bus capacitor 112 by laser welding, and the second electrode piece 1142 is connected to the second output terminal 1122 of the bus capacitor 112 by laser welding.

[0146] Optionally, the insulating piece 1143 is provided with a second through hole 11431 on both sides of the welding position of the first electrode piece 1141 for facilitating welding.

[0147] In some related technologies, the output copper bar of the bus capacitor is connected to the power module by screw locking, which has contact resistance and a complicated installation process. In the scheme provided in the embodiments of the present application, the first electrode piece 1141 and / or the second electrode piece 1142 are connected to the bus capacitor 112 by laser welding, which has a larger contact area and reduces the contact resistance compared with the screw connection, and simplifies the installation process.

[0148] In some embodiments, the first electrode piece 1141 and the second electrode piece 1142 have equal thicknesses.

[0149] The first electrode piece 1141 and the second electrode piece 1142 are both sheet-shaped metal conductors, such as copper sheets. In some embodiments, the thicknesses of the first electrode piece 1141 and the second electrode piece 1142 are both 1 mm, which has a high welding yield. It can be understood that the thicknesses of the first electrode piece 1141 and the second electrode piece 1142 can also be other values, such as 0.5 mm to 2 mm.

[0150] By setting the first electrode piece 1141 and the second electrode piece 1142 to have equal thicknesses, the same welding parameters can be used in the processes of laser welding the first electrode piece 1141 to the bus capacitor 112 and laser welding the second electrode piece 1142 to the bus capacitor 112, which further simplifies the installation process and improves the manufacturing yield.

[0151] In some embodiments, the first electrode piece 1141 is laser welded to the first input terminal 1131, and / or the second electrode piece 1142 is laser welded to the second input terminal 1132.

[0152] For example, the multiple extension parts 11411 on both sides of the first electrode piece 1141 are welded to the first input terminals 1131 of the two power modules 113, and the multiple welding parts on both sides of the second electrode piece 1142 are welded to the second input terminals 1132 of the two power modules 113. Figure 12 The first welding point 11412 between the second electrode piece 1142 and the power module 113 is shown, Figure 13One of the second welding points 11422 between the first electrode piece 1141 and the power module 113 is shown, and the second welding point 11422 is located on the extension 11411.

[0153] In the motor controller 11 provided by the embodiment, the DC electrical connection piece 114 is located between the two power modules 113, and the two sides of the first electrode piece 1141 and the second electrode piece 1142 are respectively lapped on the two power modules 113, facilitating the connection by the laser welding mode, simplifying the installation process, and reducing the contact resistance.

[0154] In some embodiments, the opposite two surfaces of the first electrode piece 1141 along the second direction Z are planes; and / or, the opposite two surfaces of the second electrode piece 1142 along the second direction Z are planes.

[0155] Optionally, the first input terminal 1131 and the first output terminal 1121 are flushly arranged, and the second input terminal 1132 and the second output terminal 1122 can also be flushly arranged, which is conducive to the first electrode piece 1141 and the second electrode piece 1142 being arranged as flat sheets.

[0156] Since the first electrode piece 1141 and the second electrode piece 1142 are stacked on one side of the bus capacitor 112 and can be directly connected to the bus capacitor 112 and the power module 113, the first electrode piece 1141 and the second electrode piece 1142 are both flat sheets without the need for bending, which reduces the manufacturing tolerance and improves the manufacturing yield.

[0157] Please refer to Figures 7 to 9 In some embodiments, along the second direction Z, the distance between the first electrode piece 1141 and the second electrode piece 1142 ranges from 0.2mm to 1.5mm.

[0158] The distance D of the first electrode piece 1141 and the second electrode piece 1142 along the second direction Z can be 0.2mm, 0.5mm, 0.8mm, 1.0mm, 1.2mm, 1.5mm, etc. The smaller the distance D, the more mutual cancellation of stray inductance between the first electrode piece 1141 and the second electrode piece 1142.

[0159] The distance is equal to or close to the interval of the first input terminal 1131 and the second input terminal 1132 on the power module 113 along the second direction Z, so as to facilitate the electrical connection of the DC electrical connection piece 114 to the power module 113. When the interval is equal to the interval of the first input terminal 1131 and the second input terminal 1132 on the power module 113 along the second direction Z, the first electrode piece 1141 and the second electrode piece 1142 do not need to be bent, which reduces the risk of affecting the yield due to the manufacturing tolerance caused by bending.

[0160] The distance between the first electrode member 1141 and the second electrode member 1142 in the second direction Z is greater than or equal to 0.2 mm, which facilitates the connection of the first electrode member 1141 and the second electrode member 1142 to the power module 113 respectively, and the first electrode member 1141 and the second electrode member 1142 can be kept apart and insulated. The distance between the first electrode member 1141 and the second electrode member 1142 in the second direction Z is less than or equal to 1.5 mm, and the first electrode member 1141 and the second electrode member 1142 are stacked and have a small gap, so the stray inductance is small.

[0161] In other embodiments, the first electrode member 1141 and / or the second electrode member 1142 can also be partially bent to reduce the gap between them and reduce the stray inductance.

[0162] In some embodiments, the motor controller 11 further includes a housing 111, and the two power modules 113, the DC connection member 114, and the bus capacitor 112 are all arranged in the housing 111. The motor controller 11 further includes two AC connection members 115, and the two AC connection members 115 are connected to the two power modules 113 one by one. One end of the AC connection member 115 extends to the external environment of the housing 111 and is used for directly electrically connecting the motor.

[0163] The AC connection member 115 is a component for electrically connecting the power module 113 and the motor. The input terminal of the AC connection member 115 is electrically connected to the AC output terminal of the power module 113, and the output terminal of the AC connection member 115 is electrically connected to the AC input terminal of the motor. The AC connection member 115 can be, but is not limited to, a copper bar, a wire, etc.

[0164] The bottom of the housing 111 is provided with two lead-out holes 1112. One end of the AC connection member 115 is located inside the housing 111 and is electrically connected to the power module 113, and the other end extends out of the housing 111 to the external environment and is used for directly electrically connecting the motor. The direct electrical connection of the AC connection member 115 to the motor means that no intermediate component is arranged between the AC connection member 115 and the AC input terminal of the motor, but the AC connection member 115 directly contacts and connects with the AC input terminal of the motor.

[0165] The motor controller 11 provided by the embodiments of the present application directly electrically connects the AC connection member 115 to the motor by penetrating the housing 111, without using a wire harness, an adapter, or other components to electrically connect the AC connection member 115 to the motor. This effectively reduces the number of components of the electric drive device 10, and effectively shortens the current transmission path between the motor controller 11 and the motor, thereby effectively reducing the stray inductance generated in the current transmission process and effectively improving the performance of the electric drive device 10 using the above motor controller 11.

[0166] In some embodiments, the two AC connectors 115 are respectively located on opposite sides of the two power modules 113 along the first direction X.

[0167] The two power modules 113 are arranged side by side along the first direction X, and the AC connectors 115 are connected to the sides of the corresponding power modules 113 away from the DC connectors 114.

[0168] That is, one AC connector 115, one power module 113, another power module 113, and another AC connector 115 are arranged in sequence along the first direction X, and the first direction X can be the length direction of the motor controller 11. In another embodiment, the first direction X can be the width direction of the motor controller 11.

[0169] By adopting the above technical solution, the two AC connectors 115 are respectively located on opposite sides of the two power modules 113, the spacing between the two AC connectors 115 is large, the AC connectors 115 can be directly electrically connected to the motor, the wire harness cost is saved, the current transmission path between the motor controller 11 and the motor is further shortened, and the stray inductance generated in the current transmission process is further reduced, and the performance of the electric drive device 10 using the above motor controller 11 is further improved.

[0170] Please refer to Figures 4 to 13 In some embodiments, the motor controller 11 includes a housing 111, two power modules 113, a bus capacitor 112, and a DC connector 114. The two power modules 113 are arranged side by side along a first direction X. The bus capacitor 112 is potted in the housing 111 and located between the two power modules 113. The DC connector 114 is located between the two power modules 113 and stacked with the bus capacitor 112 along a second direction Z, which is the height direction of the motor controller 11. The two power modules 113 are electrically connected to the bus capacitor 112 through the DC connector 114. The DC connector 114 includes a first electrode 1141 and a second electrode 1142 with opposite polarities. The first electrode 1141 and the second electrode 1142 are separated and stacked. Optionally, the first electrode 1141 is a positive electrode, and the second electrode 1142 is a negative electrode.

[0171] The second electrode 1142 is disposed on the side of the first electrode 1141 near the bus capacitor 112. The second electrode 1142 has a first through hole 11421, and the first electrode 1141 is connected to the bus capacitor 112 through the first through hole 11421. The bus capacitor 112 has a first output terminal 1121 and a second output terminal 1122 on the side facing the DC connector 114. The first electrode 1141 is connected to the first output terminal 1121 by laser welding, and the second electrode 1142 is connected to the second output terminal 1122 by laser welding. The first electrode 1141 has extensions 11411 on both sides along the first direction X. The first electrode 1141 is connected to the first input terminal 1131 of the power module 113 through the extensions 11411, and the second electrode 1142 is connected to the second input terminal 1132 of the power module 113 on both sides along the first direction X.

[0172] The motor controller 11 provided in this application embodiment has less stray inductance, which is beneficial to improving the performance of the electric drive device 10.

[0173] Secondly, please refer to Figure 3 This application provides an electric drive device 10, including a motor controller 11, a first motor 12, and a second motor 13 as described in the first aspect. A power module 113 is electrically connected to the first motor 12, and another power module is electrically connected to the second motor 13.

[0174] The first motor 12 and the second motor 13 are arranged sequentially along the first direction X, and the two power modules 113 can be directly electrically connected to the motors through the corresponding AC connectors 115.

[0175] The electric drive device 10 provided in this application embodiment effectively improves the performance of the electric drive device 10 by employing the motor controller 11 described in any of the above embodiments.

[0176] Thirdly, please refer to Figure 1 This application provides an electric drive system 1, including a battery 20 and an electric drive device 10 as described in any of the above embodiments, wherein the battery 20 is electrically connected to the electric drive device 10.

[0177] The electric drive system 1 provided in this application embodiment effectively improves the performance of the electric drive system 1 by employing the electric drive device 10 described in any of the above embodiments.

[0178] Fourthly, please refer to Figure 1 This application provides an electric device including the electric drive system 1 described above.

[0179] The electrically-driven system 1 is adopted in the electrically-driven device provided by the embodiments of the present application, so that the performance of the electrically-driven device is effectively improved.

[0180] The above only provides the preferred embodiments of the present application and is not used to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. An electric motor controller characterized by, The motor controller comprises: two power modules arranged side by side along a first direction, each of the power modules being provided with first input terminals and second input terminals with opposite polarities; a bus capacitor between the two power modules, the bus capacitor being provided with first output terminals and second output terminals with opposite polarities; a direct current electrical connector between the two power modules and stacked with the bus capacitor along a second direction perpendicular to the first direction, the direct current electrical connector comprising first electrode members and second electrode members with opposite polarities, the first electrode members and the second electrode members being separated and stacked along the second direction, the first electrode members being electrically connected to the first output terminals and the first input terminals of the two power modules, and the second electrode members being electrically connected to the second output terminals and the second input terminals of the two power modules.

2. The motor controller of claim 1, wherein, The second electrode members are between the first electrode members and the bus capacitor, the second electrode members being provided with first through holes, and the first electrode members are connected to the first output terminals through the first through holes.

3. The motor controller of claim 2, wherein, The direct current electrical connector further comprises an insulating member, at least part of the insulating member being arranged between the first electrode members and the second electrode members. The insulating member is provided with second through holes corresponding to and communicating with the first through holes, and the first electrode members are connected to the first output terminals through the first through holes and the second through holes.

4. The motor controller of claim 3, wherein, The insulating member covers at least part of the first electrode members.

5. The motor controller of claim 2, wherein, The number of the first output terminals and the second output terminals is multiple, and the multiple first output terminals and the multiple second output terminals are alternately and separately arranged along a third direction perpendicular to the second direction and intersecting the first direction. The second electrode members are provided with multiple first through holes arranged along the third direction, and each of the first through holes exposes one of the first output terminals.

6. The motor controller of claim 1, wherein, The first input terminals and the second input terminals are arranged on the side of the power modules close to the direct current electrical connector, and the first input terminals and the second input terminals are separately arranged in the first direction. In the second direction, the first input terminals are arranged on the side of the second input terminals close to the direct current electrical connector. The first electrode members are respectively connected to the first input terminals of the two power modules on both sides of the first electrode members along the first direction, and the second electrode members are respectively connected to the second input terminals of the two power modules on both sides of the second electrode members along the first direction.

7. The motor controller of claim 1, wherein, The first electrode members are respectively provided with extension portions on both sides of the first electrode members along the first direction, the extension portions extending to the outside of the second electrode members along the first direction, and the first electrode members are connected to the first input terminals through the extension portions.

8. The motor controller of claim 1, wherein, The motor controller further comprises a housing, and the two power modules, the direct current electrical connector and the bus capacitor are arranged in the housing, and the bus capacitor comprises a core body filled in the housing.

9. The motor controller of claim 8, wherein, The bus capacitor further comprises a first busbar, a second busbar and an insulating support arranged on the core body, the first busbar and the second busbar are electrically connected with the core body, the first output terminal is arranged on the first busbar, the second output terminal is arranged on the second busbar, and the first output terminal and the second output terminal are arranged separately on the insulating support.

10. The motor controller of any one of claims 1-9, wherein, In the second direction, the second electrode piece is completely inside the first electrode piece in the orthographic projection.

11. The motor controller of any one of claims 1-9, wherein, The first electrode piece is laser welded to the bus capacitor; and / or, The second electrode piece is laser welded to the bus capacitor.

12. The motor controller of claim 11, wherein, The thickness of the first electrode piece is equal to that of the second electrode piece.

13. The motor controller of any one of claims 1-9, wherein, The first electrode piece is laser welded to the first input terminal; and / or, The second electrode piece is laser welded to the second input terminal.

14. The motor controller of any one of claims 1-9, wherein, The two opposite surfaces of the first electrode piece in the second direction are planes; and / or, The two opposite surfaces of the second electrode piece in the second direction are planes.

15. The motor controller of any one of claims 1-9, wherein, In the second direction, the distance between the first electrode piece and the second electrode piece ranges from 0.2mm to 1.5mm.

16. The motor controller of any one of claims 1-9, wherein, The motor controller further comprises a housing, and the two power modules, the DC electrical connection and the bus capacitor are arranged in the housing; The motor controller further comprises two AC electrical connections, the two AC electrical connections are connected with the two power modules one by one, and one end of the AC electrical connection extends to the external environment of the housing and is used for directly electrically connecting the motor.

17. The motor controller of claim 16, wherein, In the first direction, the two AC electrical connections are respectively located on the opposite sides of the two power modules.

18. An electric drive device characterized by comprising: The electric drive device comprises the motor controller according to any one of claims 1-17, a first motor and a second motor, one power module is electrically connected with the first motor, and the other power module is electrically connected with the second motor.

19. An electric drive system, characterized by The electric drive system comprises a battery and the electric drive device according to claim 18, and the battery is electrically connected with the electric drive device.

20. An electrically powered device, characterized by The electric device comprises the electric drive system according to claim 19. The electric device comprises the electric drive system according to claim 19.

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