Low-temperature self-heating electric drive assembly and control method thereof

Abstract

The invention relates to a low-temperature self-heating electric drive assembly and a control method thereof, and the low-temperature self-heating electric drive assembly comprises a drive motor which comprises a first input shaft, a first motor connected with the first input shaft, a second input shaft and a second motor connected with the second input shaft; the first motor and the second motor are connected with the power battery; the gearbox comprises an output shaft and a planetary gear mechanism composed of a sun gear, a planet carrier and a gear ring, the sun gear and the planet carrier are arranged on the output shaft in a sleeved mode, the sun gear is in transmission connection with the first input shaft and the second input shaft, and the output shaft is provided with an out-of-gear mechanism combined with or separated from the planet carrier. Energy is provided for efficiency loss of the first motor and the second motor through discharging of the power battery, heat is generated by working current of the power battery through internal resistance, and self-heating is achieved. The second motor drives the gearbox to operate to achieve static engine heating, the temperature of the gearbox is increased, and the low-temperature driving dynamic property of the vehicle is improved.

Description

Technical Field

[0001] The present application relates to the technical field of thermal management of electric drive powertrains, and in particular to a low-temperature self-heating electric drive assembly and a control method thereof. Background Art

[0002] As society pays more attention to energy conservation and emission reduction, the requirements for vehicle fuel consumption, pollutant emissions and carbon emission control in the field of vehicle technology are constantly increasing; this has promoted the low-carbon development of vehicles with pure electric drive as the main line.

[0003] With the development of electrification and intelligence, it is not only necessary to ensure that the power components in the vehicle maintain the optimal operating temperature, but also the energy utilization requirements for the entire vehicle are becoming increasingly higher. At the same time, people's requirements for thermal comfort of vehicle heating and cooling are constantly increasing, which will have a significant impact on the vehicle's range, which is the main pain point of new energy vehicles.

[0004] Key components like the battery pack and motor drive assembly must maintain a suitable operating temperature to ensure efficient vehicle operation. Therefore, thermal management of these components is crucial for ensuring vehicle performance and safety, as well as optimizing range.

[0005] Ambient temperature can affect the starting and operating capabilities of new energy vehicles. When the ambient temperature is too low, the charge and discharge capacity of the new energy vehicle's power battery will be significantly reduced. Furthermore, the high viscosity of the lubricating oil in the transmission's lubrication system at low temperatures can also significantly reduce the lubrication performance of the transmission and other systems.

[0006] Existing technical solutions generally use the vehicle's thermal management system to heat the battery pack, or use pulsed self-heating technology to heat the battery pack. For the transmission, methods such as increasing the lubrication pump power to pump oil at low temperatures are employed. These methods make it difficult to simultaneously achieve battery pack heating and adequate transmission lubrication. Summary of the Invention

[0007] The embodiments of the present application provide a low-temperature self-heating electric drive assembly and a control method thereof to solve the problem in the related art that it is difficult to simultaneously achieve battery pack heating and sufficient lubrication of the transmission when the ambient temperature of the battery pack and the motor drive assembly is too low.

[0008] A first aspect of an embodiment of the present application provides a low-temperature self-heating electric drive assembly, comprising: a drive motor comprising a first input shaft and a first motor connected to the first input shaft, and a second input shaft and a second motor connected to the second input shaft; a power battery, the first motor and the second motor are both connected to the power battery, and the power battery supplies power to the first motor and the second motor simultaneously or separately; A gearbox includes an output shaft, a planetary gear mechanism consisting of a sun gear, a planet carrier and a ring gear, the sun gear and the planet carrier are loosely mounted on the output shaft, the sun gear is respectively connected to the first input shaft and the second input shaft, and the output shaft is provided with a disengagement mechanism for engaging or disengaging the planet carrier.

[0009] In some embodiments: the gearbox also includes a first gear pair transmission-connected between the first input shaft and the output shaft, a second driving gear transmission-connected between the first input shaft and the sun gear, and a first shifting mechanism circumferentially fixed on the first input shaft for connecting or disconnecting the first gear pair and the second driving gear.

[0010] In some embodiments: the gearbox also includes a second gear pair transmission-connected between the second input shaft and the output shaft, a fourth driving gear transmission-connected between the second input shaft and the sun gear, and a second shifting mechanism circumferentially fixed on the second input shaft for connecting or disconnecting the second gear pair and the fourth driving gear.

[0011] In some embodiments: the second gear pair includes a third driving gear loosely mounted on the second input shaft, and a first driven gear fixed to the output shaft, the third driving gear and the first driven gear are meshed and connected with each other, and the fourth driving gear is loosely mounted on the second input shaft.

[0012] In some embodiments: the first gear pair includes a first driving gear loosely mounted on the first input shaft, and a first driven gear fixed on the output shaft, the first driving gear and the first driven gear are meshed with each other, and the second driving gear is loosely mounted on the first input shaft.

[0013] In some embodiments: the first input shaft includes a first input shaft front section and a first input shaft rear section coaxially arranged with each other, and a first intermediate shaft is offset at one side of the first input shaft; A third gear pair is connected between the first intermediate shaft and the front section of the first input shaft, and a fourth gear pair is connected between the first intermediate shaft and the rear section of the first input shaft; The rear section of the first input shaft is provided with a third shift mechanism for connecting or disconnecting the front section of the first input shaft and the fourth gear pair.

[0014] In some embodiments, the second input shaft includes a second input shaft front section and a second input shaft rear section coaxially disposed with each other, and a second intermediate shaft is offset from one side of the second input shaft; A fifth gear pair is connected between the second intermediate shaft and the front section of the second input shaft, and a sixth gear pair is connected between the second intermediate shaft and the rear section of the second input shaft; The rear section of the second input shaft is provided with a fourth shift mechanism for connecting or disconnecting the front section of the second input shaft and the sixth gear pair.

[0015] In some embodiments, the fifth gear pair includes a seventh driving gear and a fourth driven gear meshing with each other, the seventh driving gear is fixedly sleeved on the front section of the second input shaft, and the fourth driven gear is fixed on the second intermediate shaft; The sixth gear pair includes an eighth driving gear and a fifth driven gear meshing with each other, the eighth driving gear is loosely sleeved on the rear section of the second input shaft, and the fifth driven gear is fixed on the second intermediate shaft; The fourth shifting mechanism is circumferentially fixed on the rear section of the second input shaft and is located between the seventh driving gear and the eighth driving gear.

[0016] In some embodiments, the third gear pair includes a fifth driving gear and a second driven gear meshing with each other, the fifth driving gear is fixedly sleeved on the front section of the first input shaft, and the second driven gear is fixed on the first intermediate shaft; The fourth gear pair includes a sixth driving gear and a third driven gear meshing with each other, the sixth driving gear is fixedly sleeved on the rear section of the first input shaft, and the third driven gear is fixed on the first intermediate shaft; The third shifting mechanism is circumferentially fixed on the rear section of the first input shaft and is located between the fifth driving gear and the sixth driving gear.

[0017] A second aspect of an embodiment of the present application provides a method for controlling a low-temperature self-heating electric drive assembly, the method using the low-temperature self-heating electric drive assembly described in any of the above embodiments, the method comprising: When the vehicle is powered on and the temperatures of the transmission and the power battery reach set thresholds, the disengagement mechanism engages the planetary carrier and the output shaft, and the power battery supplies power to the first and second motors, which then respectively output positive torque to the output shaft through the first and second input shafts via the planetary gear mechanism. The vehicle brakes, and when the temperatures of the transmission and the power battery both reach set thresholds, the disengagement mechanism engages the planetary carrier and the output shaft, and the output shaft provides reverse torque to the first and second motors through the planetary gear mechanism, and the first and second motors generate electricity and store it in the power battery; When the vehicle is powered on and the temperature of the transmission and / or the power battery is lower than a set threshold, the disengagement mechanism disengages the planetary carrier and the output shaft, and the power battery supplies power to the second motor. The second motor drives the first motor to rotate through the planetary gear mechanism via the second input shaft, and the first motor generates electricity and stores it in the power battery.

[0018] The beneficial effects of the technical solution provided by this application include: An embodiment of the present application provides a low-temperature self-heating electric drive assembly and a control method thereof. Since the low-temperature self-heating electric drive assembly of the present application is provided with a drive motor, the drive motor includes a first input shaft and a first motor connected to the first input shaft, and a second input shaft and a second motor connected to the second input shaft; a power battery, the first motor and the second motor are both connected to the power battery, and the power battery supplies power to the first motor and the second motor simultaneously or separately; a gearbox, the gearbox includes an output shaft, a planetary gear mechanism composed of a sun gear, a planetary carrier and a ring gear, the sun gear and the planetary carrier are loosely mounted on the output shaft, the sun gear is respectively connected to the first input shaft and the second input shaft, and the output shaft is provided with a disengagement mechanism for engaging or disengaging from the planetary carrier.

[0019] Therefore, the low-temperature self-heating electric drive assembly of the present application will connect the first input shaft and the second input shaft of the first motor and the second motor, respectively, and drive the sun gear of the planetary gear mechanism, and provide a disengagement mechanism on the output shaft that engages or disengages the planetary carrier. When the temperature of the gearbox and / or the power battery is lower than the set threshold, the disengagement mechanism disengages the planetary carrier and the output shaft, and the power battery supplies power to the second motor. The second motor drives the first motor to rotate through the planetary gear mechanism via the second input shaft, and the first motor generates electricity and stores it in the power battery. The efficiency loss of the first motor and the second motor is provided by the discharge of the power battery, and the working current of the power battery generates heat by the internal resistance to achieve self-heating. The second motor drives the gearbox to operate to realize a static heat engine, increase the gearbox temperature, and improve the low-temperature driving power of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0021] Figure 1 This is a schematic structural diagram of the electric drive assembly according to an embodiment of the present application; Figure 2 This is a schematic diagram of the electric drive assembly in the dual-motor positive torque output state according to an embodiment of the present application; Figure 3 This is a schematic diagram of the electric drive assembly in the dual-motor kinetic energy recovery state according to an embodiment of the present application; Figure 4 This is a schematic diagram of the electric drive assembly of an embodiment of the present application in a dual-motor static drag state.

[0022] Reference numerals: 1, first motor; 2, first input shaft; 3, second motor; 4, second input shaft; 5, power battery; 6, output shaft; 7, sun gear; 8, planet carrier; 9, ring gear; 10, disengagement mechanism; 11, first driving gear; 12, first driven gear; 13, second driving gear; 14, first gear shifting mechanism; 15, third driving gear; 16, fourth driving gear; 17, second gear shifting mechanism; 18, first intermediate shaft; 19, fifth driving gear; 20, second driven gear; 21, sixth driving gear; 22, third driven gear; 23, third gear shifting mechanism; 24, second intermediate shaft; 25, seventh driving gear; 26, fourth driven gear; 27, eighth driving gear; 28, fifth driven gear; 29, fourth gear shifting mechanism. DETAILED DESCRIPTION

[0023] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0024] The embodiments of the present application provide a low-temperature self-heating electric drive assembly and a control method thereof, which can solve the problem that a battery pack and a motor drive assembly are difficult to simultaneously realize battery pack heating and gearbox full lubrication when the ambient temperature is too low in the related art.

[0025] Referring to Figure 1 The first aspect of the embodiments of the present application provides a low-temperature self-heating electric drive assembly, which comprises: a driving motor, the driving motor comprising a first input shaft 2 and a first motor 1 connected to the first input shaft 2, and a second input shaft 4 and a second motor 3 connected to the second input shaft 4; the first input shaft 2 and the second input shaft 4 are arranged in parallel and spaced apart.

[0026] a power battery 5, the first motor 1 and the second motor 3 are connected to the power battery 5, the power battery 5 simultaneously or respectively supplies power to the first motor 1 and the second motor 3, so as to make the first motor 1 and the second motor 3 operate synchronously or independently.

[0027] a gearbox, the gearbox comprising an output shaft 6, a planetary gear mechanism composed of a sun gear 7, a planet carrier 8 and a ring gear 9, wherein the sun gear 7 and the planet carrier 8 are both loosely fitted on the output shaft 6, the sun gear 7 is in driving connection with the first input shaft 2 and the second input shaft 4 respectively, and the output shaft 6 is provided with a disengagement mechanism 10 for engaging or disengaging the planet carrier 8.

[0028] The low-temperature self-heating electric drive assembly of the embodiment of the present application will connect the first input shaft 2 and the second input shaft 4 of the first motor 1 and the second motor 3, respectively, and drive the sun gear 7 of the planetary gear mechanism, and provide a disengagement mechanism 10 on the output shaft 6 for engaging or disengaging from the planetary carrier 8.

[0029] When the disengagement mechanism 10 is engaged with the output shaft 6 and the planetary carrier 8, the power of the first motor 1 and the second motor 3 is output to the output shaft 6 through the planetary gear mechanism. When the disengagement mechanism 10 is disengaged from the output shaft 6 and the planetary carrier 8, the power of the second motor 3 is output to the first motor 1 through the planetary gear mechanism, achieving static counter-traction of the first motor 1 and the second motor 3.

[0030] When the temperature of the gearbox and / or the power battery 5 is lower than the set threshold, the disengagement mechanism 10 disengages the planetary carrier 8 and the output shaft 6, and the power battery 5 supplies power to the second motor 3. The second motor 3 drives the first motor 1 to rotate through the second input shaft 4 through the planetary gear mechanism, and the first motor 1 generates electricity and stores it in the power battery 5.

[0031] The efficiency losses of the first and second motors 1 and 3 are offset by the discharge of the power battery 5. The operating current of the power battery 5 generates heat from its internal resistance, enabling self-heating of the power battery 5. The second motor 3 drives the transmission to operate as a static heat engine, raising the transmission temperature and improving the vehicle's low-temperature driving dynamics.

[0032] In some alternative embodiments: See Figure 1 As shown, an embodiment of the present application provides a low-temperature self-heating electric drive assembly, the gearbox of which also includes a first gear pair transmission-connected between the first input shaft 2 and the output shaft 6, a second driving gear 13 transmission-connected between the first input shaft 2 and the sun gear 7, and a first shifting mechanism 14 circumferentially fixed on the first input shaft 2 for combining or separating the first gear pair and the second driving gear 13.

[0033] The gearbox also includes a second gear pair transmission-connected between the second input shaft 4 and the output shaft 6, a fourth driving gear 16 transmission-connected between the second input shaft 4 and the sun gear 7, and a second shift mechanism 17 circumferentially fixed on the second input shaft 4 for engaging or disengaging the second gear pair and the fourth driving gear 16.

[0034] Specifically, the second gear pair includes a third driving gear 15 loosely mounted on the second input shaft 4 and a first driven gear 12 fixed on the output shaft 6 . The third driving gear 15 is meshed with the first driven gear 12 , and the fourth driving gear 16 is loosely mounted on the second input shaft 4 .

[0035] The first gear pair includes a first driving gear 11 loosely mounted on the first input shaft 2 and a first driven gear 12 fixed on the output shaft 6 . The first driving gear 11 and the first driven gear 12 are meshed with each other, and the second driving gear 13 loosely mounted on the first input shaft 2 .

[0036] The first shift mechanism 14 and the second shift mechanism 17 both have left-engaged, right-engaged, and intermediate states. When the disengagement mechanism 10 is disengaged from the planetary carrier 8 and the output shaft 6, and both the first shift mechanism 14 and the second shift mechanism 17 are in the left-engaged state, the power of the first motor 1 sequentially passes through the first input shaft 2, the first driving gear 11, the first driven gear 12, and the output shaft 6 to reach the wheel end. The power of the second motor 3 sequentially passes through the second input shaft 4, the third driving gear 15, the first driven gear 12, and the output shaft 6 to reach the wheel end.

[0037] When the disengagement mechanism 10 is engaged with the planetary carrier 8 and the output shaft 6, and both the first shift mechanism 14 and the second shift mechanism 17 are in the right engagement state, the power of the first motor 1 sequentially passes through the first input shaft 2, the second driving gear 13, the sun gear 7, the planetary carrier 8, and the output shaft 6 to reach the wheel end. The power of the second motor 3 sequentially passes through the second input shaft 4, the fourth driving gear 16, the sun gear 7, the planetary carrier 8, and the output shaft 6 to reach the wheel end.

[0038] When the disengagement mechanism 10 is disengaged from the planetary carrier 8 and the output shaft 6, and the first gear shift mechanism 14 and the second gear shift mechanism 17 are both in the right engagement state, the power of the second motor 3 passes through the second input shaft 4, the fourth driving gear 16, the sun gear 7, the planetary carrier 8, the second driving gear 13, and the first input shaft 2 in sequence to reach the first motor 1.

[0039] In some alternative embodiments: See Figure 1 As shown, an embodiment of the present application provides a low-temperature self-heating electric drive assembly, wherein the first input shaft 2 of the electric drive assembly includes a first input shaft front section and a first input shaft rear section coaxially arranged with each other, the first input shaft front section is connected to the first motor 1, the first input shaft rear section is connected to the first driving gear 11, and a first intermediate shaft 18 is offset on one side of the first input shaft 2.

[0040] A third gear pair is connected between the first intermediate shaft 18 and the front section of the first input shaft, and a fourth gear pair is connected between the first intermediate shaft and the rear section of the first input shaft. A third shift mechanism is provided on the rear section of the first input shaft for connecting or disconnecting the front section of the first input shaft and the fourth gear pair.

[0041] The second input shaft 4 includes a second input shaft front section and a second input shaft rear section which are coaxially arranged with each other. The second input shaft front section is connected to the second motor 3 , and the second input shaft rear section is connected to the third driving gear 15 . A second intermediate shaft 24 is offset on one side of the second input shaft 4 .

[0042] A fifth gear pair is connected between the second intermediate shaft 24 and the front section of the second input shaft, and a sixth gear pair is connected between the second intermediate shaft 24 and the rear section of the second input shaft. A fourth shift mechanism 29 is provided on the rear section of the second input shaft for connecting or disconnecting the front section of the second input shaft and the sixth gear pair.

[0043] Specifically, the fifth gear pair includes a seventh driving gear 25 and a fourth driven gear 26 that are meshed together. The seventh driving gear 25 is fixedly mounted on the front section of the second input shaft, and the fourth driven gear 26 is fixed to the second intermediate shaft 24. The sixth gear pair includes an eighth driving gear 27 and a fifth driven gear 28 that are meshed together. The eighth driving gear 27 is loosely mounted on the rear section of the second input shaft, and the fifth driven gear 28 is fixed to the second intermediate shaft 24. The fourth shifting mechanism 29 is circumferentially fixed to the rear section of the second input shaft and is located between the seventh driving gear 25 and the eighth driving gear 27.

[0044] The third gear pair includes a fifth driving gear 19 and a second driven gear 20, which are meshed together. The fifth driving gear 19 is fixedly mounted on the front section of the first input shaft, and the second driven gear 20 is fixed to the first intermediate shaft 18. The fourth gear pair includes a sixth driving gear 21 and a third driven gear 22, which are meshed together. The sixth driving gear 21 is loosely mounted on the rear section of the first input shaft, and the third driven gear 22 is fixed to the first intermediate shaft 18. The third shifting mechanism 23 is circumferentially fixed to the rear section of the first input shaft and is located between the fifth driving gear 19 and the sixth driving gear 21.

[0045] Both the third shift mechanism 23 and the fourth shift mechanism 29 have left-engaged, right-engaged, and intermediate states. When the third shift mechanism 23 is right-engaged with the sixth driving gear 21, the power of the first motor 1 passes through the front section of the first input shaft, the fifth driving gear 19, the second driven gear 20, the first intermediate shaft 18, the third driven gear 22, and the sixth driving gear 21, reaching the rear section of the first input shaft. When the third shift mechanism 23 is left-engaged with the fifth driving gear 19, the power of the first motor 1 passes through the front section of the first input shaft and then reaches the rear section of the first input shaft.

[0046] When the fourth shifting mechanism 29 is engaged with the eighth driving gear 27 in the right direction, the power of the second motor 3 passes through the front section of the second input shaft, the seventh driving gear 25, the fourth driven gear 26, the second intermediate shaft 24, the fifth driven gear 28, and the eighth driving gear 27, and then reaches the rear section of the second input shaft. When the fourth shifting mechanism 29 is engaged with the seventh driving gear 25 in the left direction, the power of the second motor 3 passes through the front section of the second input shaft and then reaches the rear section of the second input shaft.

[0047] See also Figures 1 to 4As shown, a second aspect of an embodiment of the present application provides a method for controlling a low-temperature self-heating electric drive assembly, the method using the low-temperature self-heating electric drive assembly described in any of the above embodiments, the method comprising: Step 101: The vehicle is powered on, and when the temperatures of the gearbox and the power battery 5 reach the set thresholds, the disengagement mechanism 10 is combined with the planetary carrier 8 and the output shaft 6, and the power battery 5 supplies power to the first motor 1 and the second motor 3. The first motor 1 and the second motor 3 respectively output positive torque to the output shaft 6 through the first input shaft 2 and the second input shaft 4 through the planetary gear mechanism, thereby driving the vehicle to operate.

[0048] Step 102: The vehicle brakes, and when the temperatures of the gearbox and the power battery 5 reach the set threshold, the disengagement mechanism 10 combines with the planetary carrier 8 and the output shaft 6, and the output shaft 6 provides reverse torque to the first motor 1 and the second motor 3 through the planetary gear mechanism. The first motor 1 and the second motor 3 generate electricity and store it in the power battery 5, realizing braking energy recovery.

[0049] Step 103: The vehicle is powered on, and when the temperature of the transmission and / or the power battery 5 is lower than the set threshold, the disengagement mechanism 10 disengages the planetary carrier 8 and the output shaft 6, and the power battery 5 supplies power to the second motor 3. The second motor 3 drives the first motor 1 to rotate through the second input shaft 4 through the planetary gear mechanism, and the first motor 1 generates electricity and stores it in the power battery 5.

[0050] The power battery 5 of the embodiment of the present application is self-heated by using the first motor 1 and the second motor 3 tow. The first motor 1 and the second motor 3 are respectively in the driving mode and the power generation mode. The efficiency of the motors at different operating points is different. The efficiency loss of the first motor 1 and the second motor 3 is provided by the discharge of the power battery 5. The working current of the power battery 5 generates heat due to the internal resistance, and the power battery 5 achieves self-heating.

[0051] When the power battery 5 has a need for self-heating, the low-efficiency working area of ​​the first motor 1 and the second motor 3 is selected, and the gearbox is shifted to the low-efficiency working area through the first to fourth shift mechanisms, so that the power battery 5 needs to provide a larger current for power output to balance the drag.

[0052] When the demand for self-heating comes from the gearbox, the high-efficiency working area of ​​the first motor 1 and the second motor 3 is selected, and the gearbox is shifted to the low-efficiency working area through the first to fourth shift mechanisms, so that the power battery 5 can use energy as much as possible to heat the gearbox while providing a smaller power output.

[0053] How it works An embodiment of the present application provides a low-temperature self-heating electric drive assembly and a control method thereof. Since the low-temperature self-heating electric drive assembly of the present application is provided with a drive motor, the drive motor includes a first input shaft 2 and a first motor 1 connected to the first input shaft 2, and a second input shaft 4 and a second motor 3 connected to the second input shaft 4; a power battery 5, the first motor 1 and the second motor 3 are both connected to the power battery 5, and the power battery 5 supplies power to the first motor 1 and the second motor 3 simultaneously or separately; a gearbox, the gearbox includes an output shaft 6, a planetary gear mechanism composed of a sun gear 7, a planetary carrier 8 and a ring gear 9, the sun gear 7 and the planetary carrier 8 are loosely mounted on the output shaft 6, the sun gear 7 is respectively connected to the first input shaft 2 and the second input shaft 4, and the output shaft 6 is provided with a disengagement mechanism 10 for engaging or disengaging from the planetary carrier 8.

[0054] Therefore, the low-temperature self-heating electric drive assembly of the present application will connect the first input shaft 2 and the second input shaft 4 of the first motor 1 and the second motor 3, which are respectively connected to the sun gear 7 of the planetary gear mechanism, and a disengagement mechanism 10 that engages or disengages the planetary carrier 8 is provided on the output shaft 6. When the temperature of the gearbox and / or the power battery 5 is lower than the set threshold, the disengagement mechanism 10 disengages the planetary carrier 8 and the output shaft 6, and the power battery 5 supplies power to the second motor 3. The second motor 3 drives the first motor 1 to rotate through the planetary gear mechanism via the second input shaft 4, and the first motor 1 generates electricity and stores it in the power battery 5. The efficiency loss of the first motor 1 and the second motor 3 is provided by the discharge of the power battery 5. The working current of the power battery 5 generates heat by the internal resistance to achieve self-heating. The second motor 3 drives the gearbox to operate to realize a static heat engine, increase the gearbox temperature, and enhance the low-temperature driving power of the vehicle.

[0055] In the description of this application, it should be noted that the terms "upper" and "lower" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0056] It should be noted that, in this application, relational terms such as "first" and "second" are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0057] The foregoing is merely a list of specific embodiments of the present application, intended to enable those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the broadest scope consistent with the principles and novel features of the present application.

Claims

1. A low-temperature self-heating electric drive assembly, characterized in that: include: A drive motor, comprising a first input shaft (2) and a first motor (1) connected to the first input shaft (2), and a second input shaft (4) and a second motor (3) connected to the second input shaft (4); A power battery (5), wherein the first motor (1) and the second motor (3) are both connected to the power battery (5), and the power battery (5) supplies power to the first motor (1) and the second motor (3) simultaneously or separately; A gearbox, comprising an output shaft (6), a planetary gear mechanism consisting of a sun gear (7), a planet carrier (8) and a ring gear (9), wherein the sun gear (7) and the planet carrier (8) are loosely mounted on the output shaft (6), the sun gear (7) is respectively connected to a first input shaft (2) and a second input shaft (4), and a disengagement mechanism (10) for engaging with or disengaging from the planet carrier (8) is provided on the output shaft (6).

2. The low-temperature self-heating electric drive assembly according to claim 1, characterized in that: The gearbox further comprises a first gear pair drivingly connected between the first input shaft (2) and the output shaft (6), a second driving gear (13) drivingly connected between the first input shaft (2) and the sun gear (7), and a first shifting mechanism (14) circumferentially fixed on the first input shaft (2) for engaging or disengaging the first gear pair and the second driving gear (13).

3. A low-temperature self-heating electric drive assembly according to claim 1 or 2, characterized in that: The gearbox further comprises a second gear pair drivingly connected between the second input shaft (4) and the output shaft (6), a fourth driving gear (16) drivingly connected between the second input shaft (4) and the sun gear (7), and a second shifting mechanism (17) circumferentially fixed on the second input shaft (4) for engaging or disengaging the second gear pair and the fourth driving gear (16).

4. The low-temperature self-heating electric drive assembly according to claim 3, characterized in that: The second gear pair comprises a third driving gear (15) loosely mounted on the second input shaft (4), and a first driven gear (12) fixed on the output shaft (6), the third driving gear (15) and the first driven gear (12) being meshed and connected with each other, and the fourth driving gear (16) loosely mounted on the second input shaft (4).

5. The low-temperature self-heating electric drive assembly according to claim 2, characterized in that: The first gear pair comprises a first driving gear (11) loosely mounted on the first input shaft (2), and a first driven gear (12) fixed on the output shaft (6), the first driving gear (11) and the first driven gear (12) being meshed and connected with each other, and the second driving gear (13) loosely mounted on the first input shaft (2).

6. The low-temperature self-heating electric drive assembly according to claim 1, characterized in that: The first input shaft (2) comprises a first input shaft front section and a first input shaft rear section coaxially arranged with each other, and a first intermediate shaft (18) is offset on one side of the first input shaft (2); A third gear pair is connected between the first intermediate shaft (18) and the front section of the first input shaft, and a fourth gear pair is connected between the first intermediate shaft (18) and the rear section of the first input shaft; The rear section of the first input shaft is provided with a third shift mechanism (23) for connecting or disconnecting the front section of the first input shaft and the fourth gear pair.

7. A low-temperature self-heating electric drive assembly according to claim 1 or 6, characterized in that: The second input shaft (4) comprises a second input shaft front section and a second input shaft rear section coaxially arranged with each other, and a second intermediate shaft (24) is offset on one side of the second input shaft; A fifth gear pair is connected between the second intermediate shaft (24) and the front section of the second input shaft, and a sixth gear pair is connected between the second intermediate shaft (24) and the rear section of the second input shaft; The rear section of the second input shaft is provided with a fourth shift mechanism (29) for connecting or disconnecting the front section of the second input shaft and the sixth gear pair.

8. The low-temperature self-heating electric drive assembly according to claim 7, characterized in that: The fifth gear pair comprises a seventh driving gear (25) and a fourth driven gear (26) meshingly connected to each other, the seventh driving gear (25) being fixedly sleeved on the front section of the second input shaft, and the fourth driven gear (26) being fixed on the second intermediate shaft (24); The sixth gear pair comprises an eighth driving gear (27) and a fifth driven gear (28) meshingly connected to each other, the eighth driving gear (27) being loosely sleeved on the rear section of the second input shaft, and the fifth driven gear (28) being fixed on the second intermediate shaft (24); The fourth shift mechanism (29) is circumferentially fixed on the rear section of the second input shaft and is located between the seventh driving gear (25) and the eighth driving gear (27).

9. The low-temperature self-heating electric drive assembly according to claim 6, characterized in that: The third gear pair comprises a fifth driving gear (19) and a second driven gear (20) meshingly connected to each other, the fifth driving gear (19) being fixedly sleeved on the front section of the first input shaft, and the second driven gear (20) being fixed on the first intermediate shaft (18); The fourth gear pair comprises a sixth driving gear (21) and a third driven gear (22) meshingly connected to each other, the sixth driving gear (21) being fixedly sleeved on the rear section of the first input shaft, and the third driven gear (22) being fixed on the first intermediate shaft (18); The third shifting mechanism (23) is circumferentially fixed on the rear section of the first input shaft and is located between the fifth driving gear (19) and the sixth driving gear (21).

10. A control method for a low-temperature self-heating electric drive assembly, characterized in that: The method uses the low-temperature self-heating electric drive assembly according to any one of claims 1 to 9, and the method comprises: The vehicle is powered on, and when the temperatures of the gearbox and the power battery (5) both reach a set threshold, the disengagement mechanism (10) is combined with the planetary carrier (8) and the output shaft (6), and the power battery (5) supplies power to the first motor (1) and the second motor (3), and the first motor (1) and the second motor (3) respectively output positive torque to the output shaft (6) through the first input shaft (2) and the second input shaft (4) through the planetary gear mechanism; The vehicle brakes, and when the temperatures of the gearbox and the power battery (5) both reach a set threshold, the disengagement mechanism (10) combines with the planetary carrier (8) and the output shaft (6), and the output shaft (6) provides reverse torque to the first motor (1) and the second motor (3) through the planetary gear mechanism, and the first motor (1) and the second motor (3) generate electricity and store it in the power battery (5); The vehicle is powered on, and when the temperature of the gearbox and / or the power battery (5) is lower than a set threshold, the disengagement mechanism (10) disengages the planetary carrier (8) and the output shaft (6), the power battery (5) supplies power to the second motor (3), the second motor (3) drives the first motor (1) to rotate via the second input shaft (4) through the planetary gear mechanism, and the first motor (1) generates electricity and stores it in the power battery (5).

Images