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CN-121986032-A - Power assembly and electric vehicle

CN121986032ACN 121986032 ACN121986032 ACN 121986032ACN-121986032-A

Abstract

The utility model provides a power assembly and electric vehicle, power assembly's casing includes automatically controlled groove and motor groove, and automatically controlled groove is used for holding the radiator and the contravariant bridge arm power module of motor controller, and the motor groove is used for holding the motor. The electric control grooves are laminated on the motor grooves along the radial direction of the motor. The cell wall of the motor cell comprises a first flow channel and a second flow channel, wherein the first flow channel is used for cooling the motor, and the second flow channel is used for communicating with the radiator to cool the inverter bridge arm power module. The partial groove wall of the motor groove is used for forming the groove bottom of the electric control groove, and at least part of the first flow channel and the second flow channel are distributed on the partial groove wall of the motor groove. According to the application, the first flow passage for cooling the motor and the second flow passage for cooling the inverter bridge arm power module are integrated on the common groove wall of the motor groove and the electric control groove, so that the first flow passage and the second flow passage can block heat from being transferred between the motor and the motor controller, thereby being beneficial to realizing temperature rise control of the power assembly and improving the performances of the power assembly and the electric vehicle.

Inventors

  • LIU HONGBING
  • BAI LIFEI
  • SUN XINGZHAO
  • GUO BINXIN

Assignees

  • 华为技术有限公司

Dates

Publication Date
20260505
Application Date
20251223
Priority Date
20250312

Claims (15)

  1. 1. The utility model provides a power assembly, its characterized in that, power assembly's casing includes automatically controlled groove and motor groove, automatically controlled groove is used for holding motor controller's in the power assembly radiator and contravariant bridge arm power module, the motor groove is used for holding power assembly's motor, contravariant bridge arm power module is used for exporting three-phase current control the motor, along the radial of motor automatically controlled groove range upon range of in the motor groove, wherein: The cell wall of the motor slot comprises a first flow channel and a second flow channel, the first flow channel is used for cooling the motor, the second flow channel is used for being communicated with the radiator to cool the inverter bridge arm power module, part of the cell wall of the motor slot is used for forming the cell bottom of the electric control slot, and at least part of the first flow channel and the second flow channel are distributed on the part of the cell wall of the motor slot.
  2. 2. The powertrain of claim 1, wherein the first flow passage and the second flow passage are arranged between the motor and the radiator in a radial direction of the motor.
  3. 3. The powertrain of claim 1, wherein a slot wall of the motor slot includes a plurality of the first flow channels, at least a portion of each of the first flow channels is distributed on an inner circumferential surface of the portion of the slot wall of the motor slot, and an included angle between an arrangement direction of the plurality of first flow channels and an extension direction of the second flow channels is greater than or equal to 0 degrees, less than or equal to 90 degrees.
  4. 4. A powertrain according to claim 3, wherein the inner peripheral surface of the wall of the motor groove includes a first groove facing away from the motor recess, and a gap between the first groove and the motor is used to form one of the first flow passages, and an angle between an extending direction of the one of the first flow passages and an extending direction of the second flow passage is greater than or equal to 0 degrees, less than or equal to 90 degrees.
  5. 5. The powertrain of claim 4, wherein the second flow passage is configured to output cooling water to a heat exchanger of the powertrain, an inlet of the one of the first flow passages is configured to receive cooling oil output from an oil pump of the powertrain through the heat exchanger, and the inlet of the one of the first flow passages is distributed in the first groove, and is spaced apart from a bottom of the electric control groove in a circumferential direction of the motor.
  6. 6. The power assembly according to claim 4, wherein an inner peripheral surface of a slot wall of the motor slot is used for fixing an outer peripheral surface of a stator of the motor, the outer peripheral surface of the stator includes a second groove, the second groove is recessed away from the inner peripheral surface of the partial slot wall of the motor slot, a gap between the second groove and the inner peripheral surface of the partial slot wall of the motor slot is used for forming another first flow passage, and an included angle between an extending direction of the other first flow passage and an extending direction of the second flow passage is greater than or equal to 0 degrees, less than or equal to 90 degrees.
  7. 7. The powertrain of any of claims 1-6, wherein the partial slot wall of the motor slot includes a protrusion protruding away from an inner peripheral surface of the partial slot wall of the motor slot, the second flow passage being distributed inside the protrusion.
  8. 8. The powertrain of claim 7, wherein the partial slot walls of the motor slot further comprise bosses for cooling the capacitive modules of the motor controller, the bosses being arranged adjacent to the capacitive modules, and ribs of the bosses being connected to the outer peripheral surfaces of the bosses.
  9. 9. The locomotion assembly of claim 8, wherein the boss overlaps the projected portion of the first flow channel in the radial direction of the motor.
  10. 10. The powertrain of any of claims 1-9, wherein the electrical control slot is configured to receive two of the heat sinks of the motor controller and two of the inverter leg power modules, the two heat sinks are configured to respectively dissipate heat from the two inverter leg power modules, the housing of the powertrain includes two of the motor slots configured to respectively receive two of the motors of the powertrain, the two inverter leg power modules are configured to respectively control the two motors, and the electrical control slot is laminated to the two motor slots, wherein: The partial groove wall of each motor groove is used for forming the groove bottom of the electric control groove, and the first flow passage and the second flow passage of the groove wall of each motor groove are arranged between one motor and one radiator.
  11. 11. The powertrain of claim 10, wherein the second flow passage extends from the partial slot wall of one of the motor slots to the partial slot wall of the other of the motor slots.
  12. 12. The power assembly of claim 10, wherein the bottom of the electric control slot includes two second flow channels, each of the second flow channels being configured to communicate with at least one of the heat sinks, the two second flow channels being aligned in a direction parallel to an extension direction of at least one of the first flow channels of each of the motor slots.
  13. 13. The powertrain of claim 12, wherein a bottom of the electric control tank includes two first interfaces and two second interfaces, each of the first interfaces is configured to communicate with an inlet of one of the heat sinks, each of the second interfaces is configured to communicate with an outlet of one of the heat sinks, an outside of the electric control tank includes one liquid inlet and one liquid outlet, the two first interfaces are configured to receive cooling liquid from the one liquid inlet through one of the second channels, the two second interfaces are configured to output cooling liquid from the one liquid outlet through one of the second channels, one of the first interfaces and one of the second interfaces are configured to be distributed to the partial tank wall of one of the motor tanks, and the other of the first interfaces and the other of the second interfaces are configured to be distributed to the partial tank wall of the other of the motor tank.
  14. 14. The powertrain of claim 13, wherein the one second flow passage extends from the one liquid inlet to the one first port and the other first port in sequence, and the other second flow passage extends from the one liquid outlet to the other second port and the one second port in sequence.
  15. 15. An electric vehicle comprising a power cell and a powertrain as claimed in any one of claims 1 to 14 for receiving power from the power cell and for driving wheels of the electric vehicle.

Description

Power assembly and electric vehicle The present application claims priority from the chinese patent application filed at month 03 and 12 of 2025, filed with the chinese national intellectual property agency, application number 202520431258.0, entitled "powertrain and electric vehicle", the entire contents of which are incorporated herein by reference. Technical Field The application relates to the technical field of electric vehicles, in particular to a power assembly and an electric vehicle. Background In the new energy automobile industry, the power assembly is the power source of the whole automobile. The motor controller in the power assembly is used for transmitting the electric energy of the power battery to the motor and controlling the motor to work. When the power assembly is in a working state, the internal devices such as the motor, the motor controller and the like can generate more heat. If the cooling of the power assembly has the problem of low efficiency, the motor and the motor controller may generate heat to cause negative effects on each other, so that the power assembly has the risk of overtemperature aging failure, and the working efficiency and the safety performance of the power assembly are negatively affected. Disclosure of Invention The embodiment of the application provides a power assembly capable of improving cooling efficiency and an electric vehicle. In a first aspect, an embodiment of the present application provides a power assembly, where a housing of the power assembly includes an electrical control slot and a motor slot, the electrical control slot is configured to accommodate a radiator of a motor controller and an inverter leg power module in the power assembly, and the motor slot is configured to accommodate a motor of the power assembly. The inverter bridge arm power module is used for outputting three-phase current to control the motor. The electric control grooves are laminated on the motor grooves along the radial direction of the motor. The groove wall of the motor groove comprises a first flow passage and a second flow passage, the first flow passage is used for cooling the motor, and the second flow passage is used for communicating with the radiator to cool the inverter bridge arm power module. The partial groove wall of the motor groove is used for forming the groove bottom of the electric control groove, and at least part of the first flow channel and the second flow channel are distributed on the partial groove wall of the motor groove. In the embodiment of the application, heat generated by the motor is usually derived from copper loss, iron loss and mechanical friction, and when the motor is in a climbing or rapid acceleration scene, the heat productivity of the motor can be further increased. The heat generated by the motor controller is usually derived from the energy loss of the inverter bridge arm power module during the switching process and the resistance loss in the conducting state. According to the embodiment of the application, the motor and the inverter bridge arm power module are cooled respectively by the first flow passage and the second flow passage, so that the temperature rise control of the motor and the motor controller is realized, and the risk of overtemperature ageing failure of the motor and the motor controller is reduced. At present, the new energy automobile industry has higher and higher requirements on the volume and the power density of the power assembly. In order to achieve the miniaturization design of the power assembly, the electric control groove is laminated on the motor groove, and part of the groove wall of the electric control groove is used for forming the groove bottom of the electric control groove, so that the motor and the motor controller are compactly distributed, and the whole size of the power assembly is reduced. In this case, since the heat productivity of the motor is generally greater than that of the motor controller, the tank structure shared by the electric control tank and the motor tank forms a heat conduction path, so that heat transfer from the motor to the motor controller is accelerated, and the temperature of devices such as an inverter bridge arm power module of the motor controller is increased. In order to avoid the problems, the first flow channel and the second flow channel are integrated on part of the groove walls of the motor groove, namely, the first flow channel and the second flow channel are formed on a groove body structure shared by the motor groove and the electric control groove, so that the heat of the motor, which is transferred to the motor controller, can be taken away by cooling mediums in the first flow channel and the second flow channel by utilizing the heat conduction paths between the electric control groove and the motor groove. The embodiment of the application can reduce the negative influence of the heating of the motor on the motor controller under the condition of