Granted Patent B2

US 12,627,202 · App. 18/455,288 · Granted May 12, 2026

Inventors: Haisong Xu (Shanghai, CN); Lingkun Zhu (Shanghai, CN); Yibo Wang (Shanghai, CN)

Assignee: HUAWEI DIGITAL POWER TECHNOLOGIES CO., LTD.

H02K9/197H02K9/225

Abstract

Claims (74)

1 . A power assembly, comprising:

a power component comprising a stator disposed in a rotating shaft cavity and configured to drive cooling liquid to flow during rotation of the power component; and

a shell comprising:

an accommodating structure filled with the cooling liquid and rotatably disposing the power component;

a flow diversion structure configured to guide a flow direction of the cooling liquid;

a liquid storage structure configured to:

receive the cooling liquid that is guided from the flow diversion structure;

store the cooling liquid; and

distribute the cooling liquid;

a heat dissipation structure comprising:

a spacer plate disposed on a top of the rotating shaft cavity and comprising a liquid guiding hole; and

a stator heat dissipation groove in communication with the liquid storage structure and the accommodating structure, wherein the stator heat dissipation groove is configured to:

receive the cooling liquid from the liquid storage structure; and

transfer the cooling liquid to the stator through the liquid guiding hole for cooling the power component; and

a heat exchange structure configured to:

perform heat exchange on the cooling liquid in the accommodating structure; and

perform cooling on the cooling liquid in the accommodating structure.

2 . The power assembly of claim 1 , wherein the shell further comprises:

a motor shell comprising the rotating shaft cavity; and

a reducer shell connected to the motor shell, wherein the reducer shell comprises a gear cavity, and wherein the rotating shaft cavity and the gear cavity are in communication with each other and jointly form the accommodating structure.

3 . The power assembly of claim 2 , wherein the spacer plate and the motor shell define the stator heat dissipation groove, and wherein the liquid guiding hole is in communication with the stator heat dissipation groove and the rotating shaft cavity.

4 . The power assembly of claim 3 , wherein the spacer plate and the motor shell are integrated with each other.

5 . The power assembly of claim 3 , wherein the shell further comprises a liquid storage plate that is disposed on a top of the gear cavity, wherein the liquid storage plate and the reducer shell define the liquid storage structure, and wherein the liquid storage structure is in communication with the stator heat dissipation groove.

6 . The power assembly of claim 5 , wherein the liquid storage plate and the reducer shell are integrated with each other.

7 . The power assembly of claim 5 , wherein the flow diversion structure is disposed in the gear cavity, wherein the liquid storage plate includes a liquid inlet hole disposed between a side of the liquid storage plate close to the flow diversion structure and the reducer shell, and wherein the liquid inlet hole is in communication with the liquid storage structure and the gear cavity.

8 . The power assembly of claim 7 , wherein the flow diversion structure and the reducer shell are integrated with each other.

9 . The power assembly of claim 3 , wherein the power component comprises:

a rotor rotatably disposed in the stator;

an input shaft comprising an end, wherein the input shaft is coaxially disposed on the rotor, and wherein the end is rotatably disposed in the reducer shell;

an intermediate gear disposed in the gear cavity, wherein the intermediate gear comprises:

an input gear; and

an output gear, wherein the input gear and the output gear are coaxially disposed;

an output shaft gear disposed in the gear cavity; and

an input shaft gear disposed at the end of the input shaft that is disposed in the reducer shell, wherein the input gear and the input shaft gear are engaged with each other, wherein the output gear and the output shaft gear are engaged with each other, and wherein the flow diversion structure is configured to guide the cooling liquid to enter the liquid storage structure when raised by the intermediate gear or the output shaft gear.

10 . The power assembly of claim 1 , wherein the heat exchange structure comprises:

a heat exchange cavity in communication with the accommodating structure and disposed at a bottom of the accommodating structure;

a cooling cavity formed at a bottom of the shell, wherein the cooling cavity surrounds the shell to form the heat exchange cavity;

a water inlet pipe configured to allow inflow of cooling water, wherein the water inlet pipe is in communication with the cooling cavity; and

a water outlet pipe configured to allow outflow of the cooling water, and wherein the water outlet pipe is in communication with the cooling cavity.

11 . The power assembly of claim 10 , wherein the heat exchange structure further comprises cooling fins disposed in the cooling cavity, and wherein the cooling fins are configured to form, in the cooling cavity, a flow channel for allowing flow of the cooling water.

12 . The power assembly of claim 1 , wherein the heat exchange structure further comprises cooling fins that are arranged at a bottom of the shell.

13 . The power assembly of claim 9 , wherein the heat dissipation structure comprises:

a rotor heat dissipation groove comprising:

a first rotor heat dissipation groove end, wherein the first rotor heat dissipation groove end is in communication with the liquid storage structure; and

a second rotor heat dissipation groove end in communication with the liquid guiding hole; and

a mounting part disposed in the gear cavity, wherein the mounting part comprises a liquid guiding hole disposed in the mounting part, wherein the input shaft is rotatably disposed on the mounting part,

wherein the input shaft further comprises a mounting hole and a heat dissipation cavity, wherein the mounting hole is axially disposed on the input shaft, and wherein the mounting part is disposed in the mounting hole.

14 . The power assembly of claim 13 , further comprising a plate structure integrated with the reducer shell and defining the rotor heat dissipation groove.

15 . The power assembly of claim 13 , further comprising a part disposed in the reducer shell that forms the rotor heat dissipation groove.

16 . An electric vehicle, comprising:

a battery configured to provide electric energy; and

a power assembly configured to receive the electric energy, wherein the power assembly comprises:

a power component comprising a stator disposed in a rotating shaft cavity and configured to drive cooling liquid to flow during rotation of the power component; and

a shell comprising:

an accommodating structure filled with cooling liquid and rotatably disposing the power component;

a flow diversion structure configured to guide a flow direction of the cooling liquid to flow;

a liquid storage structure configured to:

receive the cooling liquid that is guided from the flow diversion structure;

store the cooling liquid; and

distribute the cooling liquid;

a heat dissipation structure comprising:

a spacer plate disposed on a top of the rotating shaft cavity and comprising a liquid guiding hole; and

a stator heat dissipation groove in communication with the liquid storage structure and the accommodating structure, wherein the stator heat dissipation groove is configured to:

 receive the cooling liquid from the liquid storage structure; and

 transfer the cooling liquid to the stator through the liquid guiding hole for cooling the power component; and

a heat exchange structure configured to:

perform heat exchange on the cooling liquid in the accommodating structure; and

perform cooling on the cooling liquid in the accommodating structure.

17 . The electric vehicle of claim 16 , wherein the shell further comprises:

a motor shell comprising the rotating shaft cavity; and

a reducer shell connected to the motor shell, wherein the reducer shell comprises a gear cavity, and wherein the rotating shaft cavity and the gear cavity are in communication with each other and jointly form the accommodating structure.

18 . The electric vehicle of claim 17 , wherein the spacer plate and the motor shell define the stator heat dissipation groove, and wherein the liquid guiding hole is in communication with the stator heat dissipation groove and the rotating shaft cavity.

19 . The electric vehicle of claim 18 , wherein the spacer plate and the motor shell are integrated with each other.

20 . The electric vehicle of claim 18 , wherein the shell comprises a liquid storage plate that is disposed on a top of the gear cavity, wherein the liquid storage plate and the reducer shell define the liquid storage structure, and wherein the liquid storage structure is in communication with the stator heat dissipation groove.

Assignments (1)

Continuity (2)

References Cited (16)