Dual-electric-motor power assembly and electric vehicle

Abstract

Provided in the present application are a dual-electric-motor power assembly and an electric vehicle. The housing of the dual-electric-motor power assembly comprises a middle partition plate, the middle partition plate divides the housing into two accommodating cavities, each accommodating cavity is used for accommodating an electric motor and a speed reducer, the middle partition plate is used for fixing a conductive member and two bearings, and the middle partition plate comprises two bearing grooves and a through hole. The through hole runs through the groove bottoms of the two bearing grooves in the axial direction of the dual-electric-motor power assembly, the conductive member passes through the through hole in the axial direction of the dual-electric-motor power assembly, two conductive ends of the conductive member are arranged on two sides of the middle partition plate, and each conductive end is used for electrical connection to an electric-motor shaft. By means of providing a through hole in the middle partition plate and configuring the conductive member to pass through the through hole, the two conductive ends are electrically connected to the electric-motor shafts in the two accommodating cavities, thereby conducting an electric current of the bearings and the electric-motor shafts to the middle partition plate, realizing bearing grounding to the housing and reducing electrical corrosion of the bearings. The grounding of two electric motors is realized by the single conductive member passing through the through hole, resulting in fewer parts, simple assembly and fast installation.

Description

Dual-motor powertrain and electric vehicles

[0001] This application claims priority to Chinese Patent Application No. 202411045589.7, filed on July 31, 2024, entitled "Dual Motor Powertrain and Electric Vehicle", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of electric vehicle technology, and in particular to a dual-motor powertrain and an electric vehicle. Background Technology

[0003] A dual-motor powertrain consists of two motors. During operation, these motors generate common-mode and differential-mode voltages. These voltages persist between the motor shafts and the powertrain housing, causing random discharges in the bearing clearances fixed to the motor shafts. This discharge corrosion damages the bearing balls and raceways, resulting in abnormal bearing noise and affecting the overall vehicle noise performance. Therefore, grounding the motor shafts is necessary. However, current dual-motor powertrains use separate grounding components connected to the motor shafts of each motor. This results in numerous components, cumbersome assembly, and an increased axial dimension, affecting the powertrain's layout within the vehicle. Summary of the Invention

[0004] This application provides a dual-motor powertrain and an electric vehicle.

[0005] In a first aspect, this application provides a dual-motor powertrain. The housing of the dual-motor powertrain includes a partition plate that divides the housing into two accommodating cavities arranged along the axial direction of the dual-motor powertrain. Each accommodating cavity is used to accommodate one motor and one reducer. A motor shaft of one motor in each accommodating cavity is used to drively connect to an input shaft of the reducer. The partition plate is used to fix a conductive element and two bearings. The conductive element is used to electrically connect the two motor shafts and the partition plate. The partition plate includes two bearing slots and a through hole. The openings of the two bearing slots face opposite directions along the axial direction of the dual-motor powertrain. Each bearing slot is used to fix one bearing, and each bearing is used to fixally connect to or drively connect to a motor shaft via an input shaft. The through hole extends through the bottom of the two bearing slots along the axial direction of the dual-motor powertrain. The conductive element passes through the through hole along the axial direction of the dual-motor powertrain. The conductive element includes two conductive ends arranged along the axial direction of the dual-motor powertrain on both sides of the partition plate. Each conductive end is used to electrically connect to a motor shaft.

[0006] In this embodiment, the through hole extends through the bottom of the two bearing slots along the axial direction of the dual-motor powertrain, allowing the conductive element to penetrate the bottom of the two bearing slots. The conductive element passes through the through hole along the axial direction of the dual-motor powertrain, enabling it to be electrically connected to the motor shafts of the two motors in the two receiving cavities. The conductive element includes two conductive ends arranged along the axial direction of the dual-motor powertrain on both sides of the partition plate. Each conductive end is used to electrically connect to one motor shaft, allowing a single conductive element to receive current from the motor shafts of the two motors in the two receiving cavities and conduct the current to the partition plate, grounding the two motor shafts. This allows the current generated by the bearings fixed to the motor shafts to be conducted through the motor shafts, the conductive element, to the partition plate and the housing, thereby reducing bearing electro-corrosion, maintaining the smoothness of the bearing surface, reducing bearing wear, and ensuring the working performance of the two motors.

[0007] In this embodiment, the conductive component is fixed to the partition plate and passes through the two receiving cavities via the through holes in the partition plate. The installation process of the conductive component is simple; only the two conductive ends of one conductive component are used to electrically connect the motor shafts of the two motors. This allows the bearings fixed to the motor shafts to conduct the generated current to the partition plate through the conductive component. Fewer parts are used, and the assembly of the conductive grounding structure is simple. The fewer parts in the conductive component also reduce the costs of production line assembly and material coding management.

[0008] In one embodiment, a through hole is coaxial with each bearing groove, and the diameter of the through hole is smaller than the inner diameter of each bearing.

[0009] In this embodiment, each bearing slot is used to fix a bearing, and each bearing is used to fix or drive a motor shaft via an input shaft. The through hole is coaxial with each bearing slot, so that the motor shaft or input shaft used for fixing each bearing can be coaxial with the through hole. The conductive element passes through the through hole along the axial direction of the dual-motor powertrain, so that the conductive element is coaxial with the two motor shafts or the two input shafts. This facilitates the electrical connection of the two conductive ends of the conductive element to the two motor shafts respectively. Thus, the current generated by the bearing fixed on the motor shaft can be conducted to the partition plate through the motor shaft, the two conductive ends of the conductive element, and the conductive element, thereby reducing the electro-corrosion of the bearing, keeping the bearing surface smoother, reducing bearing wear, and ensuring the working effect of the two motors.

[0010] In this embodiment, each bearing is used for fixed connection or transmission connection to a motor shaft via an input shaft. The diameter of the through hole is smaller than the inner diameter of each bearing, so that the two conductive ends of the conductive component along the axial direction of the dual-motor powertrain can smoothly pass through the through hole and be electrically connected to the motor shaft respectively. This simplifies the installation process of the conductive component and reduces assembly difficulty.

[0011] In one embodiment, along the axial direction of the dual-motor powertrain, the two bearing slots have the same depth, and the length of a through hole is less than the depth of each bearing slot.

[0012] In this embodiment, the through hole penetrates the bottom of the two bearing grooves along the axial direction of the dual-motor powertrain. The two bearing grooves have the same depth, so that the distance between the through hole and the groove opening of the two bearing grooves along the axial direction of the dual-motor powertrain is equal. This makes the partition plate a symmetrical structure, and the distance from the two motor shafts to the through hole is the same, which is beneficial to the balance of the two motors after the conductive parts are installed and positioned.

[0013] In this embodiment, the length of the through hole is less than the depth of each bearing groove. The smaller through hole length indicates a smaller thickness of the partition plate along the axial direction of the dual-motor powertrain, which facilitates smoother passage of conductive components through the through hole for fixation to the partition plate and electrical connection with the two motor shafts. The shorter through hole length allows the conductive components to utilize some space along the axial direction of the two bearing grooves for electrical connection when fixed to the partition plate. This reduces the overall axial dimension of the dual-motor powertrain, promoting miniaturization and facilitating its placement within the vehicle.

[0014] In one embodiment, the bottom of a bearing groove includes a recess, one recess being recessed away from the opening of a bearing groove along the axial direction of the dual-motor powertrain. The width of one bearing groove is greater than the width of the other recess along the radial direction of the dual-motor powertrain. A through hole penetrates the bottom of one recess along the axial direction of the dual-motor powertrain. The bottom of one recess is used to fix a conductive component. The distance between the opening of one bearing groove and the through hole is greater than the distance between the opening of the other bearing groove and the through hole.

[0015] In this embodiment, the bottom of a bearing groove includes a recess. A conductive element passes through the bottom of the bearing groove, thereby also passing through the bottom of the recess. The bottom of the recess is used to fix the conductive element. For example, the recess accommodates a structural component for fixing the conductive element. The spacing between the structural component fixing the conductive element and the two motor shafts is the same, which helps to balance the connection between the two ends of the conductive element and the two motors, making the overall structure of the dual-motor powertrain more stable. Furthermore, designing the conductive element as a symmetrical structure along the axial direction of the dual-motor powertrain also balances the electrical connection between the conductive element and the two motor shafts. A symmetrical design of the conductive element makes its structure more regular and simplifies processing.

[0016] In this embodiment, along the radial direction of the dual-motor powertrain, the width of one bearing groove is greater than the width of the recess, allowing the conductive component to be directly fixed within a bearing groove when passing through the through hole and the bottom of the recess, without excessively occupying the space of the partition plate along the radial direction of the dual-motor powertrain. The thinner thickness of the recessed portion of the partition plate along the axial direction of the dual-motor powertrain may weaken the structural strength of the partition plate. The fact that the width of one bearing groove is greater than the width of the recess also helps to reduce the structural range of the recessed portion of the partition plate, thus ensuring the structural reliability of the partition plate.

[0017] In this embodiment, along the axial direction of the dual-motor powertrain, the distance between the groove opening and the through hole of one bearing groove is greater than the distance between the groove opening and the through hole of the other bearing groove. This ensures that the lengths of the conductive component passing through the bottom of the groove along the axial direction of the dual-motor powertrain are equal on both sides. This is beneficial to the balance of the connection structure between the conductive component and the two motor shafts, thereby ensuring the balance and stability of the dual-motor powertrain.

[0018] In one embodiment, a partition includes two surfaces facing each other along the axial direction of the dual-motor powertrain. One surface includes a plurality of mounting holes, each opening of which faces the opening of a bearing groove along the axial direction of the dual-motor powertrain. The plurality of mounting holes are used to secure a conductive element. The plurality of mounting holes circumferentially surround a through-hole of the dual-motor powertrain. Radially, the plurality of mounting holes are arranged between the through-hole and the peripheral wall of the bearing groove.

[0019] In this embodiment, a surface includes multiple mounting holes, with the opening of each mounting hole facing the slot of a bearing groove along the axial direction of the dual-motor powertrain. This allows the conductive component to be mounted and fixed to the surface of the partition plate through the multiple mounting holes, simplifying the assembly process of the conductive component.

[0020] In this embodiment, the conductive component passes through the through hole along the axial direction of the dual-motor powertrain, and multiple mounting holes surround the through hole along the circumferential direction of the dual-motor powertrain, which facilitates a more stable installation and fixation of the conductive component on the surface of the partition plate.

[0021] In this embodiment, multiple mounting holes are arranged radially along the dual-motor powertrain between the through hole and the peripheral wall of a bearing slot. This ensures that the installation and fixing of the conductive component does not occupy space beyond the bearing slot along the radial direction of the dual-motor powertrain, bringing the installation and fixing position of the conductive component closer to the through hole. This improves the stability of the conductive component's fixing structure with the partition plate, thereby facilitating a stable electrical connection between the conductive component and the two motor shafts. The bearing can then conduct current to the partition plate through the motor shaft and the conductive component, reducing bearing galvanic corrosion. It also provides sufficient space for other components in the partition plate besides the bearing accommodated in the bearing slot. Furthermore, it reduces the fixing range of the conductive component along the radial direction of the dual-motor powertrain, contributing to the weight reduction of the conductive component and the partition plate.

[0022] In one embodiment, along the radial direction of the dual-motor powertrain, the spacing between each mounting hole and a through hole is equal, and the spacing between each mounting hole and a through hole is less than the diameter of the through hole.

[0023] In this embodiment, the spacing between each mounting hole and the through hole is equal along the radial direction of the dual-motor powertrain, which makes the arrangement of multiple mounting holes on the partition plate regular. It also helps to fix the conductive parts in the multiple mounting holes to be evenly stressed along the circumference of the dual-motor powertrain, which helps to fix the conductive parts to the partition plate more firmly.

[0024] In this embodiment, along the radial direction of the dual-motor powertrain, the distance between each mounting hole and the through hole is smaller than the diameter of the through hole. This smaller distance facilitates the arrangement of multiple mounting holes along the radial direction of the dual-motor powertrain between the through hole and the peripheral wall of a bearing groove. This ensures that the installation and fixing of the conductive component does not occupy space outside the bearing groove along the radial direction of the dual-motor powertrain, bringing the installation and fixing position of the conductive component closer to the through hole. This improves the stability of the conductive component and the partition plate fixing structure, thereby facilitating the stable electrical connection between the conductive component and the two motor shafts. It also allows the bearing to conduct current to the partition plate through the motor shaft and the conductive component, reducing bearing electro-corrosion. Furthermore, it provides sufficient space for the installation of other components in the partition plate besides the bearing accommodated in the bearing groove. It also helps to reduce the fixing range of the conductive component along the radial direction of the dual-motor powertrain, contributing to the weight reduction of the conductive component and the partition plate. The larger diameter of the through hole facilitates the smooth passage of the conductive component through the through hole to fix it to the partition plate and electrically connect it to the two motor shafts, simplifying the assembly process of the conductive component.

[0025] In one embodiment, multiple mounting holes are formed at the bottom of the groove. This allows the structural member for fixing the conductive component, housed in the groove, to be fixedly connected to the mounting holes, thereby achieving a fixed connection between the conductive component and the partition.

[0026] In one embodiment, a conductive element includes a fixed protrusion along the radial direction of the dual-motor powertrain, the fixed protrusion being opposite to the axis of the conductive element, and the fixed protrusion being used for fixing to a partition plate. Wherein, along the radial direction of the dual-motor powertrain, the outer diameter of one fixed protrusion is larger than the diameter of a through hole, and the outer diameter of another fixed protrusion is smaller than the groove width of each bearing groove.

[0027] In this embodiment, the conductive element passes through the through hole along the axial direction of the dual-motor powertrain. The conductive element and the through hole are coaxial along the axial direction of the dual-motor powertrain. The conductive element includes a fixed protrusion along the radial direction of the dual-motor powertrain. The fixed protrusion protrudes away from the axis of the conductive element, so that the fixed protrusion of the conductive element can be installed and fixed with the partition plate at a position around the through hole along the circumference of the dual-motor powertrain.

[0028] In this embodiment, along the radial direction of the dual-motor powertrain, the outer diameter of the fixing protrusion is larger than the diameter of the through hole, thereby enabling the fixing protrusion to be installed and fixed with the partition plate around the through hole, reducing assembly difficulty.

[0029] In this embodiment, along the radial direction of the dual-motor powertrain, the outer diameter of the fixed protrusion is larger than the diameter of the through hole, and the outer diameter of the fixed protrusion is smaller than the groove width of each bearing slot. This allows the conductive component to be fixed radially between the groove wall of each bearing slot and the through hole, ensuring that the installation and fixing of the conductive component does not occupy space outside the radial direction of each bearing slot. This brings the installation and fixing position of the conductive component closer to the through hole, which is beneficial to the stability of the conductive component and the partition plate fixing structure. This, in turn, is beneficial to the stable electrical connection between the conductive component and the two motor shafts, allowing the bearing to conduct the generated current to the partition plate through the motor shaft and the conductive component, thereby reducing bearing electro-corrosion. It also provides more space for the installation of other components on the partition plate besides the bearings accommodated in each bearing slot. The smaller outer diameter of the fixed protrusion also helps to reduce the radial volume of the conductive component along the dual-motor powertrain, contributing to the lightweighting of the conductive component and thus the overall lightweighting of the dual-motor powertrain. Furthermore, the smaller outer diameter of the fixed protrusion than the groove width of each bearing slot provides space for the fixed protrusion to be installed on the partition plate, avoiding interference between the fixed protrusion and the bearing.

[0030] In one embodiment, a conductive element includes two segments, each segment comprising a first sub-segment and a second sub-segment. The first sub-segment of one segment is used to fix the first sub-segment of the other segment, and the second sub-segment of each segment is used to electrically connect to a motor shaft. The second sub-segment of one segment passes through a through-hole, and the first segment of one segment is also used to fix to a central partition. Along the radial direction of the dual-motor powertrain, the outer diameter of the second sub-segment of one segment is smaller than the outer diameter of the first segment of one segment, and the outer diameter of the second sub-segment of one segment is smaller than the diameter of the through-hole, while the outer diameter of the first segment of one segment is larger than the diameter of the through-hole.

[0031] In this embodiment, a first sub-segment in one segment is used to fix a first sub-segment in another segment, thereby allowing the two segments of the conductive component to be fixedly connected as a whole, simplifying the structure of the conductive component. A second sub-segment in each segment is used to electrically connect to a motor shaft, allowing each segment's second sub-segment to receive the current generated by the bearing transmitted from a motor shaft, thus achieving bearing housing, reducing bearing electro-corrosion, extending bearing life, and ensuring the normal operation of both motors.

[0032] In this embodiment, the second sub-segment of one section is used to pass through the through hole, so that the two sections of the conductive element can respectively extend into the two receiving cavities of the housing of the dual-motor powertrain. This allows the second sub-segment of each section of the conductive element to be electrically connected to the motor shaft, achieving the connection of two motor shafts through a single conductive element, resulting in fewer parts and simpler assembly. The first sub-segment of one section is used to fix the first sub-segment of the other section, and the first sub-segment of one section is also used to fix to the partition plate, so that both sections of the conductive element can be fixed to the partition plate.

[0033] In this embodiment, along the radial direction of the dual-motor powertrain, the outer diameter of the second sub-segment in one segment is smaller than the outer diameter of the first sub-segment in the same segment, and the outer diameter of the second sub-segment is smaller than the diameter of the through hole. This allows the second sub-segment to pass through the through hole of the partition plate. The outer diameter of the first sub-segment in one segment is larger than the diameter of the through hole, preventing it from passing through the through hole. This allows the first sub-segment to be fixed to the partition plate, and the conductive component to be fixed to the partition plate. The smaller outer diameter of the second sub-segment and the larger outer diameter of the first sub-segment in one segment not only allow the conductive component to pass through the through hole and be fixed to the partition plate, but also restrict its placement within the through hole by the first and second sub-segments, which facilitates stable installation and fixation of the conductive component.

[0034] In one embodiment, the length of a conductive element along the axis of the dual-motor powertrain is greater than or equal to the distance between the two motor shafts.

[0035] In this embodiment, the length of the conductive element along the axial direction of the dual-motor powertrain is greater than or equal to the distance between the two motor shafts, so that the two conductive ends of the conductive element can maintain an electrical connection with the two motor shafts. This improves the conductivity between the conductive element and the two motor shafts, allowing the conductive element to receive the current generated by the bearings conducted from the two motor shafts, reducing bearing electro-corrosion, maintaining the smoothness of the bearing surface, reducing bearing wear, extending the bearing's service life, and ensuring the working effect of the two motors.

[0036] In one embodiment, a conductive element includes an elastic element and two contacts. Along the axial direction of the dual-motor powertrain, both ends of the elastic element are fixed or abutted against one end of each of the two contacts, and the other ends of the two contacts are two conductive ends. Specifically, along the axial direction of the dual-motor powertrain, the sum of the lengths of the two contacts and the free length of the elastic element is greater than the distance between the two motor shafts.

[0037] In this embodiment, the two ends of the elastic element along the axial direction of the dual-motor powertrain are fixed or abutted against one end of the two contacts, so that the elastic element exerts an elastic force on the two contacts in the axial direction of the dual-motor powertrain. The other ends of the two contacts are two conductive ends, which are electrically connected to the motor shafts respectively. The elastic element applies an elastic force along the axial direction of the dual-motor powertrain to the two contacts, squeezing the two contacts to make them contact the motor shafts, making the electrical connection between the two contacts and the two motor shafts more stable, which is beneficial for the conductive element to conduct electricity to the two motor shafts for a long time.

[0038] In this embodiment, along the axial direction of the dual-motor powertrain, the sum of the lengths of the two contacts and the free length of the elastic element is greater than the distance between the two motor shafts. This allows the elastic element of the conductive element to apply an elastic force along the axial direction of the dual-motor powertrain to the two contacts, squeezing the two contacts into contact with the motor shafts. This ensures that even if the two contacts wear down and shorten during long-term use, they can still maintain electrical connection with the two motor shafts, extending the conductive life of the conductive element and reducing the risk of electrical corrosion in the bearings.

[0039] In one embodiment, each motor shaft includes an end face facing a central partition along the axial direction of the dual-motor powertrain, the end face being used to contact a conductive end of a conductive element, and the outer diameter of the end face along the radial direction of the dual-motor powertrain being larger than the outer diameter of the conductive end of the conductive element it contacts.

[0040] In this embodiment, one end face of the dual-motor powertrain faces the partition plate along the axial direction. The end face is used to contact the conductive end of the conductive component, so that the current transmitted from the bearing to the motor shaft can be transmitted through the end face to the conductive end of the conductive component, and then transmitted through the conductive component to the partition plate to realize the bearing housing. This helps to reduce the electrical corrosion of the bearing, extend the service life of the bearing, and ensure the normal operation of the motor.

[0041] In this embodiment, along the radial direction of the dual-motor powertrain, the outer diameter of the end face is larger than the outer diameter of the conductive end of the conductive component it contacts. This allows the conductive end of the conductive component to have a larger contact area with the end face of the motor shaft, enabling the conductive component to receive current from the motor shaft more concentratedly and conduct it to the partition plate. The larger outer diameter of the end face compared to the conductive end of the conductive component also improves the fault tolerance of the contact between the conductive component and the end face of the motor shaft. Even if the conductive component and the motor shaft experience misalignment or small-angle deflection during motor operation, it can still ensure electrical connection between the conductive component and the end face of the motor shaft.

[0042] In one embodiment, the inner ring of each bearing is used to secure an input shaft. Each input shaft includes an input shaft cavity extending through it along the axial direction of the dual-motor powertrain. The input shaft cavity accommodates a motor shaft, and a conductive end of a conductive element is inserted into the input shaft cavity and electrically connected to the motor shaft accommodated within it. Along the radial direction of the dual-motor powertrain, the inner diameter of the input shaft cavity is larger than the outer diameter of the conductive end of the conductive element it accommodates.

[0043] In this embodiment, each input shaft includes an input shaft cavity. The input shaft cavity extends through the input shaft along the axial direction of the dual-motor powertrain and accommodates the motor shaft. The arrangement of the motor shaft along the axial direction of the dual-motor powertrain utilizes part of the space in the input shaft cavity, ensuring that the arrangement of the motor shaft does not excessively occupy the axial space of the dual-motor powertrain. This is beneficial for reducing the axial dimension of the dual-motor powertrain and thus for miniaturization. The conductive end of the conductive element is used to penetrate the input shaft cavity and for electrical connection with the motor shaft accommodated within the input shaft cavity. The conductive end of the conductive element is directly arranged within the input shaft cavity and electrically connected to the motor shaft within the input shaft cavity. This arrangement of the conductive element in the dual-motor powertrain utilizes part of the space in the input shaft cavity, ensuring that the conductive element does not excessively occupy the axial space of the dual-motor powertrain. This is beneficial for reducing the axial dimension of the dual-motor powertrain and thus for miniaturization.

[0044] In this embodiment, along the radial direction of the dual-motor powertrain, the inner diameter of the input shaft cavity is larger than the outer diameter of the conductive end of the conductive component it accommodates, so that the conductive end of the conductive component can smoothly pass into the input shaft cavity and achieve electrical connection with the motor shaft inside the input shaft cavity.

[0045] In one embodiment, each reducer includes an input wheel, two intermediate wheels, and an intermediate shaft. The input wheel is fixed to an input shaft, and the two intermediate wheels are fixed to the intermediate shaft. The input wheel meshes with one of the intermediate wheels, and the outer diameter of one intermediate wheel is larger than the outer diameter of the other intermediate wheel. Along the axial direction of the dual-motor powertrain, one intermediate wheel, the other intermediate wheel, and a partition are arranged sequentially. Along the axial direction of the dual-motor powertrain, the distance between one input wheel and a through hole is greater than the length of the other intermediate wheel, and the distance between a motor shaft accommodated in the shaft cavity of one input shaft and a through hole is greater than the distance between one input wheel and a through hole.

[0046] In this embodiment, the input wheel is fixed to the input shaft, and the two intermediate wheels are fixed to the intermediate shaft. The input wheel is used to mesh with one of the intermediate wheels. The input wheel receives kinetic energy from the motor shaft through the input shaft. The input wheel transmits the kinetic energy to one of the intermediate wheels, driving one of the intermediate wheels and the intermediate shaft to rotate. The rotation of the intermediate shaft drives the other intermediate wheel to rotate, and then transmits the kinetic energy to the output wheel of the reducer through the other intermediate wheel, thereby driving the wheel.

[0047] In this embodiment, the outer diameter of one intermediate wheel is larger than that of the other intermediate wheel. Along the axial direction of the dual-motor powertrain, one intermediate wheel, the other intermediate wheel, and the partition are arranged in sequence, so that the space of part of the input shaft between one intermediate wheel and the partition can be used to accommodate the conductive end of the conductive component. This means that the installation arrangement of the conductive component does not require additional space in the axial direction of the dual-motor powertrain, which is beneficial to reducing the axial size of the dual-motor powertrain and miniaturizing the dual-motor powertrain.

[0048] In this embodiment, along the axial direction of the dual-motor powertrain, the distance between the input wheel and the through hole is greater than the length of the other intermediate wheel, allowing one intermediate wheel, the other intermediate wheel, and the partition plate to be arranged sequentially along the axial direction of the dual-motor powertrain. The distance between the input wheel and the through hole is greater than the length of the other intermediate wheel, and the distance between the motor shaft accommodated in the input shaft cavity and the through hole is greater than the distance between the input wheel and the through hole. This allows a portion of the motor shaft to be accommodated within the input shaft cavity, and also allows the space between the motor shaft accommodated in the input shaft cavity and the through hole to accommodate the conductive end of the conductive component, facilitating the electrical connection between the conductive end and the motor shaft. Furthermore, it minimizes the space occupied by the motor shaft, input shaft, and conductive component in the axial direction of the dual-motor powertrain, thereby reducing the axial dimension of the dual-motor powertrain and promoting its miniaturization.

[0049] In one embodiment, the inner ring of each bearing is used to secure a motor shaft. Each motor shaft includes a receiving groove, with the opening of the groove facing a central partition along the dual-motor powertrain axis. A conductive end of a conductive element is used to penetrate the receiving groove and to contact the bottom of the groove. Along the radial direction of the dual-motor powertrain, the width of the receiving groove is greater than the outer diameter of the conductive end of the conductive element it accommodates.

[0050] In this embodiment, each motor shaft includes a receiving groove. The opening of the receiving groove faces the partition plate along the axial direction of the dual-motor powertrain, allowing a conductive element passing through a through-hole in the partition plate to enter the receiving groove. The conductive end of the conductive element is inserted into the receiving groove, allowing the conductive element to be arranged within the space of the receiving groove on the motor shaft, thereby reducing the axial dimension of the dual-motor powertrain. The conductive end of the conductive element contacts the bottom of the receiving groove, establishing an electrical connection between the conductive end and the motor shaft. This allows the conductive end of the conductive element to receive current from the motor shaft, enabling the current generated by the bearing to be conducted to the partition plate through the motor shaft and the conductive element, thus achieving bearing housing. This reduces bearing electro-corrosion and extends bearing service life.

[0051] In this embodiment, along the radial direction of the dual-motor powertrain, the width of the receiving groove is greater than the outer diameter of the conductive end of the conductive component it contains, so that the conductive end of the conductive component can pass through the receiving groove and be electrically connected to the bottom of the receiving groove, thereby enabling the conductive component to be electrically connected to the motor shaft. This allows the conductive end of the conductive component to receive current from the motor shaft, thus achieving bearing housing, reducing bearing electro-corrosion, and extending bearing service life.

[0052] In one embodiment, the bottom of the receiving groove is one end face of the motor shaft, used to contact one conductive end of the conductive component.

[0053] Secondly, this application provides an electric vehicle, which includes a frame, a power battery, and a dual-motor powertrain as described in the first aspect. The power battery supplies power to the two motors of the dual-motor powertrain, and the two motors drive the wheels through two reducers.

[0054] In this embodiment of the dual-motor powertrain, a through-hole is provided in the partition plate, allowing a conductive component to penetrate the bottom of the two bearing slots and the through-hole. This facilitates easier electrical connection between the two conductive ends of the conductive component and the motor shafts within the two housing cavities, thereby conducting the current from the bearings fixed to the motor shafts to the partition plate, achieving bearing housing connection and reducing bearing galvanic corrosion. In this embodiment, the electrical connection between the conductive component and the two motor shafts is achieved through a single conductive component passing through the through-hole. This reduces the number of parts, simplifies assembly, and speeds up installation, thus simplifying the installation process of the dual-motor powertrain and promoting its miniaturization, ultimately improving the overall performance of the electric vehicle. Attached Figure Description

[0055] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the embodiments of this application will be described below.

[0056] Figure 1 is a schematic diagram of the structure of the electric vehicle provided in an embodiment of this application;

[0057] Figure 2 is a schematic diagram of the dual-motor powertrain provided in an embodiment of this application;

[0058] Figure 3 is another structural schematic diagram of the dual-motor powertrain provided in an embodiment of this application;

[0059] Figure 4 is a structural schematic diagram of a dual-motor powertrain provided in another embodiment of this application;

[0060] Figure 5 is a partial cross-sectional view of the dual-motor powertrain provided in an embodiment of this application;

[0061] Figure 6 is a schematic diagram of the structure of the conductive element provided in an embodiment of this application;

[0062] Figure 7 is a partial enlarged view of the M1 part of the dual-motor powertrain in Figure 5;

[0063] Figure 8 is a partial cross-sectional view of a dual-motor powertrain provided in another embodiment of this application;

[0064] Figure 9 is a partial enlarged view of the M2 section of the dual-motor powertrain in Figure 5;

[0065] Figure 10 is a cross-sectional view of the conductive element provided in an embodiment of this application;

[0066] Figure 11 is a partial enlarged view of the M3 section of the dual-motor powertrain in Figure 5;

[0067] Figure 12 is another partial cross-sectional view of the dual-motor powertrain provided in an embodiment of this application;

[0068] Figure 13 is a partial cross-sectional view of a dual-motor powertrain provided in another embodiment of this application. Detailed Implementation

[0069] The technical solutions of the embodiments of this application will be described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0070] To enable rapid installation of the conductive components in a dual-motor powertrain and reduce the axial dimensions of the dual-motor powertrain, this application provides a dual-motor powertrain. The housing of the dual-motor powertrain includes a partition plate that divides the housing into two accommodating cavities arranged along the axial direction of the dual-motor powertrain. Each cavity accommodates a motor and a reducer. A motor shaft in each cavity is used to drive an input shaft of the reducer. The partition plate is used to fix a conductive component and two bearings. The conductive component is used to electrically connect the two motor shafts and the partition plate. The partition plate includes two bearing slots and a through hole. The openings of the two bearing slots face opposite directions along the axial direction of the dual-motor powertrain. Each bearing slot is used to fix a bearing, and each bearing is used to fix or drive a motor shaft via an input shaft. The through hole extends through the bottom of the two bearing slots along the axial direction of the dual-motor powertrain. The conductive component passes through the through hole along the axial direction of the dual-motor powertrain. The conductive component includes two conductive ends arranged along the axial direction of the dual-motor powertrain on both sides of the partition plate. Each conductive end is used to electrically connect a motor shaft. By creating through holes in the partition plate, the conductive component can penetrate the bottom of the two bearing slots and the through holes. This allows the two conductive ends of the component to be more easily electrically connected to the motor shafts within the two housing cavities, thereby conducting the current from the bearings fixed to the motor shafts to the partition plate, achieving bearing housing connection and reducing bearing electro-corrosion. This embodiment achieves electrical connection between the conductive component and the two motor shafts through a single through hole, resulting in fewer parts, simpler assembly, and faster installation.

[0071] The dual-motor powertrain provided in this application embodiment is used in electric vehicles to improve the overall performance of electric vehicles.

[0072] Figure 1 is a schematic diagram of the structure of the electric vehicle 1 provided in an embodiment of this application.

[0073] In one embodiment, the electric vehicle 1 includes a dual-motor powertrain 10, a frame 20, a power battery 30, and wheels 40, as shown in FIG1. ​​The frame 20 is used to fix the dual-motor powertrain 10, the wheels 40, and the power battery 30. The dual-motor powertrain 10 is connected to the wheels 40 in a transmission manner, and the power battery 30 provides electrical energy to the dual-motor powertrain 10.

[0074] In this embodiment, the electric vehicle 1 is a car, and the dual-motor powertrain 10 can drive the wheels 40 to rotate.

[0075] Figure 2 is a structural schematic diagram of the dual-motor powertrain 10 provided in an embodiment of this application.

[0076] In one embodiment, the dual-motor powertrain 10 includes two motors 100, two reducers 200, and a power supply unit 300.

[0077] In this embodiment, as shown in Figures 1 and 2, the power battery 30 can supply power to two motors 100 via a power supply device 300. The two motors 100 are respectively connected to the wheels 40 via two reducers 200 to provide power to the wheels 40 and drive them to move. In this embodiment, the dual-motor powertrain 10 is a distributed powertrain.

[0078] Figure 3 is another structural schematic diagram of the dual-motor powertrain 10 provided in an embodiment of this application, and Figure 4 is another structural schematic diagram of the dual-motor powertrain 10 provided in another embodiment of this application.

[0079] In one embodiment, the housing 400 of the dual-motor powertrain 10 includes a partition 410, as shown in Figures 2 to 4. The partition 410 divides the housing 400 into two receiving cavities 420 arranged along the axial direction O of the dual-motor powertrain. Each receiving cavity 420 is used to receive a motor 100 and a reducer 200. In each receiving cavity 420, a motor shaft 110 of the motor 100 is used to drive a drive connection to an input shaft 210 of the reducer 200.

[0080] In this embodiment, the kinetic energy of the motor 100 is transmitted to the input shaft 210 of the reducer 200 through the motor shaft 110, and then the speed is reduced by the gear shaft system of the reducer 200 before the power is transmitted to the wheel 40 to drive the wheel 40 to move.

[0081] In Figure 3, the two motors 100 in the dual-motor powertrain 10 are arranged on both sides of the two reducers 200, while in Figure 4, the two motors 100 in the dual-motor powertrain 10 are arranged between the two reducers 200. The two distribution methods of the dual-motor powertrain 10 are used to adapt to different usage scenarios of the electric vehicle 1.

[0082] When motor bearings are in operation, they are affected by the common-mode voltage and differential-mode voltage generated in the motor, which creates a current inside the bearing and triggers an electrochemical reaction, resulting in bearing electro-corrosion. Bearing electro-corrosion refers to the corrosion and damage to the bearing metal surface caused by the dissolution of ions on the bearing metal surface under the action of current and the chemical reaction on the electrode surface.

[0083] Dual-motor powertrains consist of two motors, each requiring a grounding assembly to ground the bearings and prevent electrical corrosion. However, having two grounding assemblies increases the number of parts and complicates assembly. In existing single-motor powertrains, the carbon brushes contact the motor cover, and the brush holders are fixed to the motor shaft, further complicating installation.

[0084] In this application, the dual-motor powertrain uses the two conductive ends of a conductive element to achieve electrical connection between the conductive element and the two motor shafts, and the conductive element is positioned and installed through the through hole of the partition plate, which can reduce the number of parts and simplify the installation process.

[0085] The dual-motor powertrain 10 provided in the embodiments of this application will be described in detail below.

[0086] Figure 5 is a partial cross-sectional view of the dual-motor powertrain 10 provided in an embodiment of this application, and Figure 6 is a structural schematic diagram of the conductive element 500 provided in an embodiment of this application.

[0087] In one embodiment, a partition 410 is used to fix a conductive element 500 and two bearings 600, as shown in FIG. 5. The conductive element 500 is used to electrically connect the two motor shafts 110 and the partition 410. The partition 410 includes two bearing grooves 411 and 412 and a through hole 413. The openings of the two bearing grooves 411 and 412 are oriented oppositely along the axis of the dual-motor powertrain. Each bearing groove 411 and 412 is used to fix a bearing 600, as shown in FIG. 3 to FIG. 5. Each bearing 600 is used to fix or drive a motor shaft 110 via an input shaft 210. The through hole 413 passes through the bottom of the two bearing grooves 411 and 412 along the axial direction O of the dual-motor powertrain. The conductive element 500 passes through the through hole 413 along the axial direction O of the dual-motor powertrain, as shown in Figures 5 and 6. The conductive element 500 includes two conductive ends 510, which are arranged on both sides of the partition plate 410 along the axial direction O of the dual-motor powertrain. Each conductive end 510 is used to electrically connect to a motor shaft 110.

[0088] In this embodiment of the application, the openings of the two bearing grooves 411 and 412 along the axial direction O of the dual-motor powertrain face opposite directions. Each bearing groove 411 and 412 is used to fix a bearing 600. Each bearing 600 is used to be fixedly connected to or driven to a motor shaft 110 via an input shaft 210. Specifically, each bearing groove 411 and 412 is used to fix the outer ring of a bearing 600, and the inner ring of the bearing 600 is fixed to the motor shaft 110 or fixed to the input shaft 210. The openings of the two bearing slots 411 and 412 face opposite directions, which facilitates the transmission connection between the two bearings 600 contained in the two bearing slots 411 and 412 and the motor shaft 110 of one of the motor 100 or the input shaft 210 of one of the reducers 200 in the two motor 100 housings. This allows the two motors 100 to be arranged on both sides of the partition plate 410, and also allows the two reducers 200 to be arranged on both sides of the partition plate 410. This makes the structure more regular and also helps to ensure that the motors 100 and reducers 200 in the two housings 420 can work independently. This allows the two motors 100 to control the operation of the single wheel 40 independently, realizing independent control of the speed and torque of the single wheel 40.

[0089] In this embodiment of the application, as shown in FIG5, the through hole 413 penetrates the bottom of the two bearing grooves 411 and 412 along the axial direction O of the dual-motor powertrain, so that the conductive element 500 can penetrate the bottom of the two bearing grooves 411 and 412. The conductive element 500 passes through the through hole 413 along the axial direction O of the dual-motor powertrain, so that the conductive element 500 can be electrically connected to the motor shafts 110 of the two motors 100 in the two receiving cavities 420 respectively. The conductive element 500 includes two conductive ends 510, which are arranged along the axial direction O of the dual-motor powertrain on both sides of the partition 410. Each conductive end 510 is used to electrically connect to a motor shaft 110, so that the conductive element 500 can receive the current from the motor shafts 110 of the two motors 100 in the two receiving cavities 420 and conduct the current to the partition 410, thus grounding the two motor shafts 110. This allows the current generated by the bearings fixed to the motor shafts 110 to be conducted through the motor shafts 110, the conductive element 500 to the partition 410 and the housing 400, thereby reducing the electro-corrosion of the bearings, maintaining the smoothness of the bearing surface, reducing wear on the bearings, and ensuring the working effect of the two motors 100. It should be noted that bearings that will experience electro-corrosion if not grounded include bearing 600, as well as other bearings fixed to the motor shaft 110 or input shaft 210.

[0090] In this embodiment, the conductive element 500 is fixed to the partition plate 410 and passes through the two receiving cavities 420 via the through hole 413 of the partition plate 410. The installation process of the conductive element 500 is simple. Only the two conductive ends 510 of one conductive element 500 are used to electrically connect the motor shafts 110 of the two motors 100, so that the bearings fixed to the motor shafts 110 can conduct the generated current to the partition plate 410 through the conductive element 500. Fewer parts are used, and the assembly of the conductive grounding structure is simple. The fewer parts of the conductive element 500 can also reduce the cost of production line assembly and material coding management.

[0091] Figure 7 is a partial enlarged view of the M1 part of the dual-motor powertrain 10 in Figure 5.

[0092] In one embodiment, as shown in Figures 5 and 7, the through hole 413 is coaxial with each bearing groove 411, 412, and the diameter of the through hole 413 is smaller than the inner diameter of each bearing 600.

[0093] In this embodiment, each bearing groove 411, 412 is used to fix a bearing 600, and each bearing 600 is used to fix or drive a motor shaft 110 via an input shaft 210. The through hole 413 is coaxial with each bearing groove 411, 412, so that the motor shaft 110 or input shaft 210 fixedly connected to each bearing 600 can be coaxial with the through hole 413. The conductive element 500 passes through the through hole 413 along the axial direction O of the dual motor power assembly, so that the conductive element 500 is coaxial with the two motor shafts 110 or the two input shafts 210. This facilitates the electrical connection of the two conductive ends 510 of the conductive element 500 to the two motor shafts 110 respectively. Thus, the current generated by the bearing fixed on the motor shaft 110 can be conducted to the partition plate 410 through the motor shaft 110, the two conductive ends 510 of the conductive element 500, and the conductive element 500, thereby reducing the electro-corrosion of the bearing, keeping the bearing surface relatively smooth, reducing bearing wear, and ensuring the working effect of the two motors 100.

[0094] In this embodiment of the application, as shown in FIG7, the diameter of the through hole 413 is denoted as L1, and the inner diameter of each bearing 600 is denoted as L2. Each bearing 600 is used for fixed connection or for transmission connection to a motor shaft 110 via an input shaft 210. L1 < L2, so that the two conductive ends 510 of the conductive component 500 along the axial direction of the dual motor power assembly can smoothly pass through the through hole 413 and be electrically connected to the motor shaft 110 respectively, which simplifies the installation process of the conductive component 500 and reduces the assembly difficulty.

[0095] In one embodiment, as shown in FIG7, along the axial direction O of the dual-motor powertrain, the two bearing grooves 411 and 412 have the same depth, and the length of the through hole 413 is less than the depth of each bearing groove 411 and 412.

[0096] In this embodiment, the two bearing grooves 411 and 412 have the same depth along the axial direction O of the dual-motor powertrain, making the structure of the partition plate 410 regular and also beneficial to the balance and stability of the housing 400 of the dual-motor powertrain 10. The through hole 413 penetrates the bottom of the two bearing grooves 411 and 412 along the axial direction O of the dual-motor powertrain. The two bearing grooves 411 and 412 have the same depth, making the distance between the through hole 413 and the groove openings of the two bearing grooves 411 and 412 along the axial direction O of the dual-motor powertrain equal. This makes the partition plate 410 a symmetrical structure, and makes the distance from the two motor shafts 110 to the through hole 413 the same, which is beneficial to the balance of the two motors 100 after the conductive component 500 is installed and positioned.

[0097] In this embodiment, the length of the through hole 413 along the axial direction O of the dual-motor powertrain is denoted as L3, and the depth of each bearing groove 411, 412 is denoted as L4. L3 < L4, and a smaller L3 indicates that the thickness of the partition plate 410 along the axial direction O of the dual-motor powertrain is smaller. This facilitates the smoother passage of the conductive component 500 through the through hole 413 to be fixed to the partition plate 410 and electrically connected to the two motor shafts 110. L3 < L4 means that when the conductive component 500 passes through the through hole 413 to be fixed to the partition plate 410, it can utilize part of the space of the two bearing grooves 411, 412 along the axial direction O of the dual-motor powertrain to electrically connect to the two motor shafts 110. This helps to reduce the overall axial dimension of the dual-motor powertrain 10, which is beneficial for the miniaturization of the dual-motor powertrain 10 and facilitates its arrangement in the vehicle.

[0098] Figure 8 is a partial cross-sectional view of a dual-motor powertrain 10 provided in another embodiment of this application.

[0099] In one embodiment, the bottom 411a of a bearing groove 411 includes a recess 4111, as shown in FIG8, which is recessed away from the opening 411b of the bearing groove 411 along the axial direction O of the dual-motor powertrain. The width of the bearing groove 411 is greater than the width of the recess 4111 along the radial direction R of the dual-motor powertrain. A through hole 413 penetrates the bottom 4112 of the recess 4111 along the axial direction O of the dual-motor powertrain. The bottom 4112 of the recess 4111 is used to fix the conductive component 500. The distance between the opening 411b of the bearing groove 411 and the through hole 413 is greater than the distance between the opening 412a of the other bearing groove 412 and the through hole 413.

[0100] In this embodiment of the application, as shown in Figures 3 and 8, the bottom 411a of the bearing groove 411 includes a groove 4111. The conductive element 500 passes through the bottom 411a of the bearing groove 411, thereby also passing through the bottom 4112 of the groove 4111. The bottom 4112 of the groove 4111 is used to fix the conductive element 500. The exemplary groove 4111 is used to accommodate the structural component for fixing the conductive element 500. The spacing between the structural component for fixing the conductive element 500 and the two motor shafts 110 is the same, which helps to balance the connection between the two ends of the conductive element 500 and the two motors 100, making the overall structure of the dual-motor powertrain 10 more stable. Designing the conductive element 500 as a symmetrical structure along the axial direction O of the dual-motor powertrain also allows for balanced electrical connection between the conductive element 500 and the two motor shafts 110. Designing the conductive element 500 as a symmetrical structure makes its structure more regular and easier to process. In one embodiment, the structural component for fixing the conductive element 500 is a fixing protrusion 530 or a retaining ring of the conductive element 500.

[0101] In this embodiment, as shown in FIG8, along the radial direction R of the dual-motor powertrain, the width of the bearing groove 411 is denoted as L5, and the width of the recess 4111 is denoted as L6, where L5 > L6. This allows the conductive component 500 to be directly fixed within the bearing groove 411 when passing through the through hole 413 and the bottom 4112 of the recess 4111, without excessively occupying the space of the partition plate 410 along the radial direction R of the dual-motor powertrain. The portion of the partition plate 410 with the recess 4111 has a thinner thickness along the axial direction O of the dual-motor powertrain, which may weaken the structural strength of the partition plate 410. However, L5 > L6 also helps to keep the structural range of the portion of the partition plate 410 with the recess 4111 smaller, which helps to ensure the structural reliability of the partition plate 410.

[0102] In this embodiment of the application, as shown in FIG8, along the axial direction O of the dual-motor powertrain, the distance between the groove opening 411b of the bearing groove 411 and the through hole 413 is denoted as L7, and the distance between the groove opening 412a of the bearing groove 412 and the through hole 413 is denoted as L8. L7 > L8, so that the length of the conductive element 500 passing through the two sides of the groove bottom 4112 of the groove 4111 along the axial direction O of the dual-motor powertrain can be equal. This is beneficial to the balance of the connection structure between the conductive element 500 and the two motor shafts 110, thereby ensuring the balance and stability of the dual-motor powertrain 10.

[0103] In one embodiment, the partition 410 includes two surfaces 430, as shown in Figures 5 and 7, facing each other along the axial direction O of the dual-motor powertrain. One surface 430a includes a plurality of mounting holes 431, with the opening of each mounting hole 431 facing the groove 411b of the bearing groove 411 along the axial direction O of the dual-motor powertrain. The plurality of mounting holes 431 are used to fix the conductive component 500. The plurality of mounting holes 431 surround the through hole 413 along the circumferential direction C of the dual-motor powertrain. The plurality of mounting holes 431 are arranged between the through hole 413 and the peripheral wall of the bearing groove 411 along the radial direction R of the dual-motor powertrain.

[0104] In this embodiment, a surface 430a includes a plurality of mounting holes 431, with the opening of each mounting hole 431 facing the slot 411b of the bearing groove 411 along the axial direction of the dual-motor powertrain. This allows the conductive component 500 to be mounted and fixed to the surface 430a of the partition plate 410 through the plurality of mounting holes 431, thus simplifying the assembly process of the conductive component 500.

[0105] In this embodiment, the conductive element 500 passes through the through hole 413 along the axial direction O of the dual-motor powertrain, and multiple mounting holes 431 surround the through hole 413 along the circumferential direction C of the dual-motor powertrain, which makes the installation and fixation of the conductive element 500 on the surface 430a of the partition plate 410 more stable.

[0106] In this embodiment, multiple mounting holes 431 are arranged along the radial direction R of the dual-motor powertrain between the through hole 413 and the peripheral wall of the bearing groove 411. This ensures that the installation and fixing of the conductive component 500 does not occupy space outside the bearing groove 411 along the radial direction R of the dual-motor powertrain, and brings the installation and fixing position of the conductive component 500 closer to the through hole 413. This is beneficial to the stability of the fixing structure between the conductive component 500 and the partition plate 410, thereby facilitating the stable electrical connection between the conductive component 500 and the two motor shafts 110. This allows the bearing to conduct current to the partition plate 410 through the motor shaft 110 and the conductive component 500, thus reducing bearing electro-corrosion. It also provides sufficient space for the installation of other components in the partition plate 410 besides the bearing 600 accommodated in the bearing groove 411. Furthermore, it helps to reduce the fixing range of the conductive component 500 along the radial direction R of the dual-motor powertrain, contributing to the weight reduction of the conductive component 500 and the partition plate 410.

[0107] Figure 9 is a partial enlarged view of the M2 part of the dual-motor powertrain 10 in Figure 5.

[0108] In one embodiment, along the radial direction R of the dual-motor powertrain, as shown in Figures 5 and 7, the spacing between each mounting hole 431 and the through hole 413 is equal, and the spacing between each mounting hole 431 and the through hole 413 is less than the diameter of the through hole 413.

[0109] In this embodiment, along the radial direction R of the dual-motor powertrain, the spacing between each mounting hole 431 and the through hole 413 is equal, which makes the arrangement of multiple mounting holes 431 on the partition plate 410 regular. It also helps the multiple mounting holes 431 to fix the conductive component 500 to be subjected to uniform force along the circumferential direction C of the dual-motor powertrain, which helps the conductive component 500 to be more firmly fixed to the partition plate 410.

[0110] In this embodiment, referring to Figures 7 and 9, the distance between each mounting hole 431 and the through hole 413 along the radial direction R of the dual-motor powertrain is denoted as L9, and the diameter of the through hole 413 is L1. Since L9 < L1, a smaller L9 facilitates the arrangement of multiple mounting holes 431 along the radial direction R of the dual-motor powertrain between the through hole 413 and the peripheral wall of the bearing groove 411. This ensures that the installation and fixing of the conductive component 500 does not occupy space outside the bearing groove 411 along the radial direction R of the dual-motor powertrain, and brings the installation and fixing position of the conductive component 500 closer to the through hole 413. This improves the stability of the fixing structure between the conductive component 500 and the partition plate 410, thereby facilitating a stable electrical connection between the conductive component 500 and the two motor shafts 110. This allows the bearing to conduct current to the partition plate 410 through the motor shaft 110 and the conductive component 500, reducing bearing electro-corrosion. It also provides sufficient space for the partition plate 410 to accommodate other components besides the bearing housed in the bearing groove 411. It also helps to reduce the fixing range of the conductive component 500 along the radial R of the dual-motor powertrain, which is beneficial to the weight reduction of the conductive component 500 and the partition plate 410. The larger L1 facilitates the smooth fixing of the conductive component 500 to the partition plate 410 through the through hole 413 and its electrical connection with the two motor shafts 110, thus simplifying the assembly process of the conductive component 500.

[0111] In one embodiment, a plurality of mounting holes 431 are formed at the bottom 4112 of the groove 4111, so that the structural component for fixing the conductive component 500 accommodated in the groove 4111 can be fixedly connected with the mounting holes 431, thereby realizing the fixed connection between the conductive component 500 and the partition plate 410.

[0112] In one embodiment, the conductive element 500 includes a fixed protrusion 530, as shown in Figures 6 and 7. Along the radial direction R of the dual-motor powertrain, the fixed protrusion 530 protrudes away from the axis of the conductive element 500 and is used to fix it to the partition plate 410. Along the radial direction R of the dual-motor powertrain, the outer diameter of the fixed protrusion 530 is larger than the diameter of the through hole 413, smaller than the groove width of each bearing groove 411, 412, and smaller than the inner diameter of each bearing 600.

[0113] In this embodiment, the conductive element 500 passes through the through hole 413 along the axial direction O of the dual-motor powertrain. The conductive element 500 and the through hole 413 are coaxial along the axial direction O of the dual-motor powertrain. The conductive element 500 includes a fixing protrusion 530 along the radial direction R of the dual-motor powertrain. The fixing protrusion 530 protrudes away from the axis of the conductive element 500, so that the fixing protrusion 530 of the conductive element 500 can be installed and fixed with the partition plate 410 around the through hole 413 along the circumferential direction C of the dual-motor powertrain.

[0114] In this embodiment of the application, as shown in FIG7, along the radial direction R of the dual motor powertrain, the outer diameter of the fixed protrusion 530 is denoted as L10, and the diameter of the through hole 413 is L1, where L10 > L1, so that the fixed protrusion 530 can be installed and fixed with the partition plate 410 around the through hole 413, reducing the assembly difficulty.

[0115] In this embodiment of the application, as shown in FIG7, the outer diameter of the fixed protrusion 530 along the radial direction R of the dual-motor power assembly is L10, the groove width of each bearing groove 411, 412 is denoted as L11, and the inner diameter of each bearing 600 is denoted as L2, where L10 < L11 and L10 < L2. This allows the conductive component 500 to be fixed along the radial direction R of the dual-motor power assembly between the groove peripheral wall of each bearing groove 411, 412 and the through hole 413. This ensures that the installation and fixing of the conductive component 500 does not occupy the space outside the radial direction R of each bearing groove 411, 412 of the dual-motor power assembly, and makes the installation and fixing position of the conductive component 500 closer to the through hole 413. This is beneficial to the stability of the fixing structure between the conductive component 500 and the middle partition plate 410, thereby facilitating the stable electrical connection between the conductive component 500 and the two motor shafts 110. This allows the bearing to conduct the generated current to the middle partition plate 410 through the motor shaft 110 and the conductive component 500, thereby reducing bearing electro-corrosion. This also allows for more space on the partition 410 for other components besides the bearings 600 housed in each bearing slot 411, 412. A smaller L10 also helps reduce the radial volume R of the conductive element 500 along the dual-motor powertrain, contributing to the weight reduction of the conductive element 500 and thus the overall weight reduction of the dual-motor powertrain 10. Furthermore, L10 < L2 provides space for the mounting protrusion 530 on the partition 410, preventing interference between the mounting protrusion 530 and the bearing 600.

[0116] In one embodiment, exemplary as shown in FIG7, the fixing protrusion 530 is fixed to the partition plate 410 by bolts 501, clips, welding or adhesive bonding.

[0117] In one embodiment, the fixing protrusion 530 includes a plurality of fixing holes 531, as shown in Figures 6 and 7. The plurality of fixing holes 531 penetrate the fixing protrusion 530 along the axial direction of the dual motor powertrain. The fixing holes 531 cooperate with the mounting holes 431 to fix the fixing protrusion 530 and the partition plate 410 to each other.

[0118] In this embodiment, the multiple fixing holes 531 of the fixing protrusion 530 and the multiple mounting holes 431 of the partition plate 410 cooperate with each other along the axial direction O of the dual-motor powertrain, so that the conductive element 500 is installed and fixed firmly in the partition plate 410. This is conducive to the stable electrical connection between the conductive element 500 and the two motor shafts 110, and allows the bearing to conduct the generated current to the partition plate 410 through the motor shaft 110 and the conductive element 500, thereby reducing bearing electro-corrosion.

[0119] In one embodiment, the conductive element 500 includes two segments 540, as shown in Figures 5 and 6. Each segment 540 includes a first sub-segment 541 and a second sub-segment 542. The first sub-segment 541a in segment 540a is used to fix the first sub-segment 541b in segment 540b, and the second sub-segment 542 in each segment 540 is used to electrically connect a motor shaft 110. The second sub-segment 542a in segment 540a passes through a through-hole 413, and the first sub-segment 541a in segment 540a is also used to fix to the partition plate 410. As shown in Figures 6 and 9, along the radial direction R of the dual-motor powertrain, the outer diameter of the second sub-segment 542a in segment 540a is smaller than the outer diameter of the first sub-segment 541a in segment 540a, the outer diameter of the second sub-segment 542a in segment 540a is smaller than the diameter of the through-hole 413, and the outer diameter of the first sub-segment 541a in segment 540a is larger than the diameter of the through-hole 413.

[0120] In this embodiment, a first sub-segment 541a of segment 540a is used to fix a first sub-segment 541b of segment 540b, thereby allowing the two segments 540a and 540b of the conductive component 500 to be fixedly connected as a whole, simplifying the structure of the conductive component 500. A second sub-segment 542 of each segment 540 is used to electrically connect to a motor shaft 110, allowing the second sub-segment 542 of each segment 540 to receive the current generated by the bearing transmitted from a motor shaft 110, achieving bearing housing, thereby reducing bearing electro-corrosion, extending bearing service life, and ensuring the normal operation of the two motors 100.

[0121] In this embodiment, a second sub-segment 542a of a section 540a passes through a through hole 413, allowing both sections 540 of the conductive member 500 to extend into the two receiving cavities 420 of the housing 400 of the dual-motor powertrain 10. This enables the second sub-segment 542 of each section 540 of the conductive member 500 to be electrically connected to the motor shaft 110. A single conductive member 500 connects the two motor shafts 110, resulting in fewer parts and simpler assembly. A first sub-segment 541a of a section 540a is used to fix the first sub-segment 541b of another section 540b. The first sub-segment 541a of a section 540a is also used to fix to the partition plate 410, allowing both sections 540 of the conductive member 500 to be fixed to the partition plate 410.

[0122] In this embodiment of the application, as shown in FIG9, along the radial direction R of the dual-motor powertrain, the outer diameter of the second sub-segment 542a in a segment 540a is denoted as L12, the outer diameter of the first sub-segment 541a in a segment 540a is denoted as L13, the diameter of the through hole 413 is L1, L12 < L13, L12 < L1, so that the second sub-segment 542a in a segment 540a can pass through the through hole 413 of the partition plate 410, L13 > L1, so that the first sub-segment 541a in a segment 540a cannot pass through the through hole 413 of the partition plate 410, so that the first sub-segment 541a in a segment 540a can be fixed to the partition plate 410, so that the conductive element 500 can be fixed to the partition plate 410. L12 < L1, L13 > L1, which allows the conductive component 500 to not only pass through the through hole 413 and be fixed to the middle partition 410, but also to restrict the position of the conductive component 500 passing through the through hole 413 by the first sub-segment 541a and the second sub-segment 542a in a section 540a, which is beneficial to the stable installation and fixation of the conductive component 500.

[0123] In one embodiment, as shown in FIG5, the length of the conductive element 500 along the axial direction of the dual-motor powertrain is greater than or equal to the distance between the two motor shafts 110.

[0124] In this embodiment, the length of the conductive element 500 along the axial direction of the dual-motor powertrain is greater than or equal to the distance between the two motor shafts 110, so that the two conductive ends 510 of the conductive element 500 can maintain an electrical connection with the two motor shafts 110, thereby improving the conductivity between the conductive element 500 and the two motor shafts 110. This allows the conductive element 500 to receive the current generated by the bearings conducted from the two motor shafts 110, reducing the electro-corrosion of the bearings, maintaining the smoothness of the bearing surface, reducing wear on the bearings, extending the service life of the bearings, and ensuring the working effect of the two motors 100.

[0125] Figure 10 is a cross-sectional view of the conductive element 500 provided in an embodiment of this application.

[0126] In one embodiment, the conductive element 500 includes an elastic element 550 and two contacts 560, as shown in FIG10. Along the axial direction O of the dual-motor powertrain 10, both ends 550a of the elastic element 550 are fixed or abutted against one end 560a of each of the two contacts 560, and the other ends 560b of the two contacts 560 are two conductive ends 510. As shown in FIGS. 5 and 10, along the axial direction O of the dual-motor powertrain 10, the sum of the lengths of the two contacts 560 and the free length of the elastic element 550 is greater than the distance between the two motor shafts 110.

[0127] In this embodiment, the two ends 550a of the elastic member 550 along the axial direction O of the dual-motor powertrain are fixed or abutted against one end 560a of the two contacts 560, so that the elastic member 550 has an elastic force on the two contacts 560 along the axial direction O of the dual-motor powertrain. The other end 560b of the two contacts 560 are two conductive ends 510, which are electrically connected to the motor shaft 110. The elastic member 550 applies an elastic force along the axial direction O of the dual-motor powertrain to the two contacts 560, squeezing the two contacts 560 so that they contact the motor shaft 110, making the electrical connection between the two contacts 560 and the two motor shafts 110 more stable, which is beneficial for the conductive member 500 to conduct electricity to the two motor shafts 110 for a long time.

[0128] In this embodiment, along the axial direction O of the dual-motor powertrain 10, the sum of the lengths of the two contacts 560 and the free length of the elastic element 550 is greater than the distance between the two motor shafts 110. This allows the elastic element 550 of the conductive element 500 to apply an elastic force along the axial direction O of the dual-motor powertrain to the two contacts 560, pressing the two contacts 560 into contact with the motor shafts 110. This ensures that even if the two contacts 560 wear down and shorten during long-term use, they can still maintain electrical connection with the two motor shafts 110, extending the conductive life of the conductive element 500 and reducing the risk of bearing corrosion.

[0129] In one embodiment, two contacts 560 are fixed to one end of two motor shafts 110 and respectively abut against the two conductive ends 510 of the conductive element 500, thereby realizing the electrical connection between the motor shaft 110 and the conductive element 500. This allows the bearing fixed on the motor shaft 110 to conduct the generated current to the conductive element 500 through the motor shaft 110 and the two contacts 560, and then to the partition plate 410, thus realizing the bearing housing.

[0130] In one embodiment, the two contacts 560 are carbon brushes, and exemplaryly, the cross-sectional shape of the carbon brushes may be square, circular, or conical. In another embodiment, the two contacts 560 are conductive pads. In yet another embodiment, the two contacts 560 are conductive spherical components.

[0131] In one embodiment, the conductive element 500 includes a conductive housing 570, as shown in FIG10. The conductive housing 570 is used to accommodate the elastic element 550 and one end 560a of the two contacts 560, while the other end 560b of the two contacts 560 is exposed outside the conductive housing 570.

[0132] In one embodiment, the conductive housing 570 includes two conductive sub-housings 571, which are fixed along the axial direction O of the dual-motor powertrain. Each conductive sub-housing 571 is used to accommodate a portion of the elastic element 550 and one end 560a of each contact 560, while the other end 560b of each contact 560 is exposed outside each conductive sub-housing 571.

[0133] In one embodiment, the elastic element 550 includes two sub-elastic elements 551, as shown in FIG10. The two sub-elastic elements 551 abut against or are fixed to each other along the axial direction O of the dual-motor powertrain. Each conductive sub-housing 571 is used to accommodate one sub-elastic element 551 and one end 560a of each contact 560, and the other end 560b of each contact 560 is exposed outside the conductive sub-housing 571.

[0134] Figure 11 is a partial enlarged view of the M3 section of the dual-motor powertrain 10 in Figure 5.

[0135] In one embodiment, each motor shaft 110 includes an end face 111, as shown in Figures 5 and 11, which faces the partition plate 410 along the axial direction of the dual-motor powertrain. The end face 111 is used to contact the conductive end 510 of the conductive element 500. The outer diameter of the end face 111 along the radial direction of the dual-motor powertrain is larger than the outer diameter of the conductive end 510 of the conductive element 500 that it contacts.

[0136] In this embodiment, the end face 111 along the axial direction of the dual-motor powertrain faces the partition plate 410. The end face 111 is used to contact the conductive end 510 of the conductive element 500, so that the current transmitted from the bearing to the motor shaft 110 can be transmitted through the end face 111 to the conductive end 510 of the conductive element 500, and then through the conductive element 500 to the partition plate 410, thus realizing the bearing housing. This helps to reduce the electrical corrosion of the bearing, extend the service life of the bearing, and ensure the normal operation of the motor.

[0137] In this embodiment, the outer diameter of the radial R end face 111 of the dual-motor powertrain is denoted as L14, and the outer diameter of the conductive end 510 of the conductive element 500 in contact with the end face 111 is denoted as L15. L14 > L15, which allows the conductive end 510 of the conductive element 500 to have a larger contact area with the end face 111 of the motor shaft 110, enabling the conductive element 500 to receive current from the motor shaft 110 more concentratedly and conduct it to the partition plate 410. L14 > L15 also improves the fault tolerance rate of the contact between the conductive element 500 and the end face 111 of the motor shaft 110. Even if the conductive element 500 and the motor shaft 110 deflect at different axes or small angles during the operation of the motor 100, it can still ensure that the conductive element 500 can be electrically connected to the end face 111 of the motor shaft 110.

[0138] Figure 12 is another partial cross-sectional view of the dual-motor powertrain 10 provided in an embodiment of this application.

[0139] In one embodiment, as shown in FIG12, the inner ring of each bearing 600 is used to fix an input shaft 210. Each input shaft 210 includes an input shaft cavity 211 extending through the input shaft 211 along the axial direction O of the dual-motor powertrain. The input shaft cavity 211 accommodates a motor shaft 110. A conductive end 510 of the conductive element 500 is inserted into the input shaft cavity 211 and electrically connected to the motor shaft 110 accommodated within the input shaft cavity 211. Along the radial direction R of the dual-motor powertrain, the inner diameter of the input shaft cavity 211 is larger than the outer diameter of the conductive end 510 of the conductive element 500 it accommodates.

[0140] In this embodiment of the application, the inner ring of each bearing 600 is fixed to an input shaft 210, such that each bearing 600 is connected to a motor shaft 110 via an input shaft 210.

[0141] In this embodiment of the application, each input shaft 210 includes an input shaft cavity 211. The input shaft cavity 211 extends through the input shaft 210 along the axial direction O of the dual-motor powertrain. The input shaft cavity 211 is used to accommodate the motor shaft 110. The arrangement of the motor shaft 110 along the axial direction O of the dual-motor powertrain utilizes part of the space of the input shaft cavity 211, so that the arrangement of the motor shaft 110 does not occupy too much space of the dual-motor powertrain 10 along the axial direction O. This is beneficial to reducing the axial dimension of the dual-motor powertrain 10, and thus to miniaturizing the dual-motor powertrain 10. The conductive end 510 of the conductive element 500 is used to pass through the input shaft cavity 211 and to be electrically connected to the motor shaft 110 housed in the input shaft cavity 211. The conductive end 510 of the conductive element 500 is directly arranged in the input shaft cavity 211 and electrically connected to the motor shaft 110 in the input shaft cavity 211. This arrangement of the conductive element 500 in the dual-motor powertrain 10 utilizes part of the space in the input shaft cavity 211, so that the conductive element 500 does not occupy too much space in the axial direction O of the dual-motor powertrain 10. This is beneficial to reducing the axial dimension of the dual-motor powertrain 10, and thus to miniaturizing the dual-motor powertrain 10.

[0142] In this embodiment, along the radial direction R of the dual-motor powertrain, the inner diameter of the input shaft cavity 211 is denoted as L16, and the outer diameter of the conductive end 510 of the conductive element 500 contained in the input shaft cavity 211 is L15. L16 > L15, so that the conductive end 510 of the conductive element 500 can smoothly pass into the input shaft cavity 211 and achieve electrical connection with the motor shaft 110 inside the input shaft cavity 211.

[0143] In one embodiment, each reducer 200 includes an input wheel 220, two intermediate wheels 230 and 240, and an intermediate shaft 250, as shown in Figures 3 and 12. The input wheel 220 is fixed to the input shaft 210, and the two intermediate wheels 230 and 240 are fixed to the intermediate shaft 250. The input wheel 220 is used to mesh with one intermediate wheel 230, and the outer diameter of the intermediate wheel 230 is larger than the outer diameter of the other intermediate wheel 240. Along the axial direction O of the dual-motor powertrain, the intermediate wheels 230, 240, and the partition plate 410 are arranged sequentially. Along the axial direction O of the dual-motor powertrain, the distance between the input wheel 220 and the through hole 413 is greater than the length of the intermediate wheel 240, and the distance between the motor shaft 110 accommodated in the input shaft cavity 211 and the through hole 413 is greater than the distance between the input wheel 220 and the through hole 413.

[0144] In this embodiment, the input wheel 220 is fixed to the input shaft 210, and the two intermediate wheels 230 and 240 are fixed to the intermediate shaft 250. The input wheel 220 is used to mesh with the intermediate wheel 230. The input wheel 220 receives kinetic energy from the motor shaft 110 through the input shaft 210. The input wheel 220 transmits the kinetic energy to the intermediate wheel 230, driving the intermediate wheel 230 and the intermediate shaft 250 to rotate. The rotation of the intermediate shaft 250 drives the intermediate wheel 240 to rotate, and then transmits the kinetic energy to the output wheel 260 of the reducer 200 through the intermediate wheel 240, thereby driving the wheel 40.

[0145] In this embodiment, the outer diameter of the intermediate wheel 230 is larger than that of the intermediate wheel 240. Along the axial direction O of the dual-motor powertrain, the intermediate wheel 230, the intermediate wheel 240, and the partition plate 410 are arranged in sequence, so that the space of part of the input shaft 210 between the intermediate wheel 230 and the partition plate 410 can be used to accommodate the conductive end 510 of the conductive component 500. This means that the installation arrangement of the conductive component 500 does not require additional space in the axial direction O of the dual-motor powertrain, which is beneficial to reducing the size of the axial direction O of the dual-motor powertrain and to miniaturizing the dual-motor powertrain 10.

[0146] In this embodiment, along the axial direction O of the dual-motor powertrain, the distance between the input wheel 220 and the through hole 413 is denoted as L17, the length of the intermediate wheel 240 is denoted as L18, and the distance between the motor shaft 110 accommodated in the input shaft cavity 211 and the through hole 413 is denoted as L19. L17 > L18, thus allowing the intermediate wheel 230, intermediate wheel 240, and partition plate 410 to be arranged sequentially along the axial direction O of the dual-motor powertrain. L17 > L18, L19 > L17, allowing a portion of the motor shaft 110 to be accommodated within the input shaft cavity 211, and also allowing the space between the motor shaft 110 accommodated in the input shaft cavity 211 and the through hole 413 to be used to accommodate the conductive end 510 of the conductive component 500, which is beneficial for the electrical connection between the conductive end 510 and the motor shaft 110. It also helps to reduce the space occupied by the motor shaft 110, input shaft 210 and conductive component 500 in the axial direction O of the dual-motor powertrain, thereby helping to reduce the axial dimension of the dual-motor powertrain 10 and to miniaturize the dual-motor powertrain 10.

[0147] Figure 13 is a partial cross-sectional view of a dual-motor powertrain 10 provided in another embodiment of this application.

[0148] In one embodiment, as shown in Figures 4, 6 and 13, along the axial direction of the dual-motor powertrain, two motors 100 are arranged between two reducers 200, and the two conductive ends 510 of the conductive element 500 are in direct contact with the two motor shafts 110 of the two motors 100 to achieve electrical connection.

[0149] In one embodiment, the inner ring of each bearing 600 is used to fix a motor shaft 110. As shown in FIG13, each motor shaft 110 includes a receiving groove 112, with the groove opening 112a facing the partition plate 410 along the dual-motor powertrain axis. The conductive end 510 of the conductive element 500 is used to pass through the receiving groove 112 and to contact the bottom 112b of the receiving groove 112. Along the radial direction R of the dual-motor powertrain, the groove width of the receiving groove 112 is greater than the outer diameter of the conductive end 510 of the conductive element 500 it receives.

[0150] In this embodiment, the inner ring of each bearing 600 is used to fix a motor shaft 110, and the conductive end 510 of the conductive element 500 is directly electrically connected to the motor shaft 110.

[0151] In this embodiment, each motor shaft 110 includes a receiving groove 112. The opening 112a of the receiving groove 112 faces the partition plate 410 along the axial direction of the dual-motor powertrain, so that the conductive element 500 passing through the through hole 413 of the partition plate 410 can be inserted into the receiving groove 112. The conductive end 510 of the conductive element 500 is used to insert into the receiving groove 112, so that the conductive element 500 can be arranged using the space of the receiving groove 112 in the motor shaft 110, thereby reducing the axial dimension of the dual-motor powertrain 10. The conductive end 510 of the conductive element 500 is used to contact the bottom 112b of the receiving groove 112, so that the conductive end 510 is electrically connected to the motor shaft 110. This allows the conductive end 510 of the conductive element 500 to receive the current from the motor shaft 110, thereby conducting the current generated by the bearing to the middle partition 410 through the motor shaft 110 and the conductive element 500, realizing the bearing housing, thereby reducing the electrical corrosion of the bearing and extending the service life of the bearing.

[0152] In this embodiment, along the radial direction R of the dual-motor powertrain, the width of the receiving groove 112 is denoted as L20, and the outer diameter of the conductive end 510 of the conductive element 500 contained in the receiving groove 112 is denoted as L21. L20 > L21, so that the conductive end 510 of the conductive element 500 can pass into the receiving groove 112, and the conductive end 510 of the conductive element 500 can be electrically connected to the bottom 112b of the receiving groove 112, thereby enabling the conductive element 500 to be electrically connected to the motor shaft 110. This allows the conductive end 510 of the conductive element 500 to receive current from the motor shaft 110, realizing the bearing housing, thereby reducing bearing electro-corrosion and extending the bearing's service life.

[0153] In one embodiment, the bottom 112b of the receiving groove 112 is the end face 111 of the motor shaft 110.

[0154] The dual-motor powertrain and electric vehicle provided in the embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and embodiments of this application. The description of the embodiments above is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in specific embodiments and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A dual-motor powertrain, characterized in that, The housing of the dual-motor powertrain includes a partition plate that divides the housing into two accommodating cavities arranged axially along the dual-motor powertrain. Each cavity accommodates a motor and a reducer. A motor shaft of one motor in each cavity is driveably connected to an input shaft of the reducer. The partition plate also secures a conductive element and two bearings. The conductive element electrically connects the two motor shafts to the partition plate. The partition plate includes: Two bearing slots, with the slot openings of the two bearing slots facing opposite directions along the axis of the dual-motor powertrain, each bearing slot is used to fix one of the bearings, and each bearing is used to be fixedly connected to or driven to a motor shaft via an input shaft; A through hole extends through the bottom of the two bearing slots along the axial direction of the dual-motor powertrain. A conductive element passes through the through hole along the axial direction of the dual-motor powertrain. The conductive element includes two conductive ends, which are arranged on both sides of the central partition along the axial direction of the dual-motor powertrain. Each conductive end is used to electrically connect to one of the motor shafts.

2. The dual-motor powertrain according to claim 1, characterized in that, The through hole is coaxial with each of the bearing grooves, and the diameter of the through hole is smaller than the inner diameter of each bearing.

3. The dual-motor powertrain according to claim 1 or 2, characterized in that, Along the axial direction of the dual-motor powertrain, the two bearing grooves have the same depth, and the length of the through hole is less than the depth of each bearing groove.

4. The dual-motor powertrain according to any one of claims 1-3, characterized in that, The bottom of one of the bearing slots includes a recess that is recessed away from the opening of the bearing slot along the axial direction of the dual-motor powertrain, wherein: Along the radial direction of the dual-motor powertrain, the width of one bearing groove is greater than the width of one recess. Along the axial direction of the dual-motor powertrain, one through hole penetrates the bottom of one groove, the bottom of the groove is used to fix one conductive component, and the distance between the opening of one bearing groove and the one through hole is greater than the distance between the opening of the other bearing groove and the one through hole.

5. The dual-motor powertrain according to any one of claims 1-4, characterized in that, The partition plate includes two surfaces facing each other along the axial direction of the dual-motor powertrain. One surface includes a plurality of mounting holes, each mounting hole opening towards a slot in a bearing groove along the axial direction of the dual-motor powertrain. The plurality of mounting holes are used to fix the conductive element, wherein: The plurality of mounting holes surround the one through hole along the circumference of the dual-motor powertrain; The plurality of mounting holes are arranged radially along the dual-motor powertrain between the through hole and the peripheral wall of the bearing groove.

6. The dual-motor powertrain according to claim 5, characterized in that, Along the radial direction of the dual-motor powertrain, the distance between each mounting hole and the through hole is equal, and the distance between each mounting hole and the through hole is less than the diameter of the through hole.

7. The dual-motor powertrain according to any one of claims 1-6, characterized in that, One of the conductive elements includes a fixed protrusion along the radial direction of the dual-motor powertrain. The fixed protrusion protrudes away from the axis of the conductive element and is used to fix it to the partition plate, wherein: Along the radial direction of the dual-motor powertrain, the outer diameter of one fixed protrusion is larger than the diameter of one through hole, and the outer diameter of the fixed protrusion is smaller than the groove width of each bearing groove.

8. The dual-motor powertrain according to any one of claims 1-7, characterized in that, The conductive element comprises two segments, each segment including a first sub-segment and a second sub-segment. The first sub-segment in one segment is used to fix the first sub-segment in the other segment, and the second sub-segment in each segment is used to electrically connect to one of the motor shafts, wherein: The second sub-segment of the first segment is used to pass through the through hole, and the first sub-segment of the first segment is also used to be fixed to the middle partition. Along the radial direction of the dual-motor powertrain, the outer diameter of the second sub-segment in the segment is smaller than the outer diameter of the first sub-segment in the segment, the outer diameter of the second sub-segment in the segment is smaller than the diameter of the through hole, and the outer diameter of the first sub-segment in the segment is larger than the diameter of the through hole.

9. The dual-motor powertrain according to any one of claims 1-8, characterized in that, The length of one conductive element along the axial direction of the dual-motor powertrain is greater than or equal to the distance between the two motor shafts.

10. The dual-motor powertrain according to any one of claims 1-9, characterized in that, The conductive element includes an elastic element and two contacts. Along the axial direction of the dual-motor powertrain, both ends of the elastic element are fixed or abutted against one end of each of the two contacts. The other ends of the two contacts are the two conductive ends. Along the axial direction of the dual-motor powertrain, the sum of the lengths of the two contacts and the free length of the elastic element is greater than the distance between the two motor shafts.

11. The dual-motor powertrain according to any one of claims 1-10, characterized in that, Each of the motor shafts includes an end face facing the partition along the axial direction of the dual-motor powertrain. The end face is used to contact a conductive end of the conductive element. The outer diameter of the end face along the radial direction of the dual-motor powertrain is larger than the outer diameter of the conductive end of the conductive element it contacts.

12. The dual-motor powertrain according to any one of claims 1-11, characterized in that, The inner ring of each of the bearings is used to fix one of the input shafts, wherein: Each input shaft includes an input shaft cavity extending through the input shaft along the axis of the dual-motor powertrain. The input shaft cavity is used to accommodate one of the motor shafts. A conductive end of the conductive element is used to pass through the input shaft cavity and to be electrically connected to the motor shaft accommodated in the input shaft cavity. Along the radial direction of the dual-motor powertrain, the inner diameter of the cavity of one input shaft is larger than the outer diameter of the conductive end of the conductive element it accommodates.

13. The dual-motor powertrain according to claim 12, characterized in that, Each of the reducers includes an input wheel, two intermediate wheels, and an intermediate shaft. The input wheel is fixed to one of the input shafts, and the two intermediate wheels are fixed to the intermediate shaft. The input wheel is used to mesh with one of the intermediate wheels, and the outer diameter of the one intermediate wheel is larger than the outer diameter of the other intermediate wheel, wherein: Along the axial direction of the dual-motor powertrain, one intermediate wheel, the other intermediate wheel, and the partition plate are arranged in sequence. Along the axial direction of the dual-motor powertrain, the distance between one input wheel and the one through hole is greater than the length of the other intermediate wheel, and the distance between the motor shaft housed in the shaft cavity of one input shaft and the one through hole is greater than the distance between the one input wheel and the one through hole.

14. The dual-motor powertrain according to any one of claims 1-11, characterized in that, The inner ring of each of the bearings is used to fix it to one of the motor shafts, wherein: Each of the motor shafts includes a receiving groove, with the opening of the receiving groove facing the central partition along the axis of the dual-motor powertrain, and one of the conductive ends of the conductive element is used to penetrate the receiving groove and to contact the bottom of the receiving groove; Along the radial direction of the dual-motor powertrain, the width of one receiving groove is greater than the outer diameter of the conductive end of the conductive element it accommodates.

15. An electric vehicle, characterized in that, The electric vehicle includes a frame, a power battery, and a dual-motor powertrain as described in any one of claims 1-14, wherein the power battery supplies power to two motors of the dual-motor powertrain, and the two motors drive the wheels through two reducers.

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