An electric pump

Abstract

The application relates to an electric pump which comprises a bottom cover, a first pin, a second pin, a stator assembly, an electric control assembly and a retainer, the bottom cover is fixedly connected with the retainer, one end of the first pin is electrically connected with the electric control assembly, the other end of the first pin can be used as a pin end when being electrically connected with an external power supply, one end of the second pin is electrically connected with the stator assembly, the other end of the second pin is electrically connected with the electric control assembly, the first pin is fixedly connected with the retainer, and the second pin is fixedly connected with the retainer, and the application has the characteristics of improving the electric connection reliability of the first pin and the electric control assembly.

Description

Technical Field

[0001] This application relates to the fields of lubrication and / or refrigeration, and more particularly to an electric pump for vehicles. Background Technology

[0002] The electric pump includes a motor housing, a cage, a bottom cover, an electrical control assembly, and pins. The pins are electrically connected to the electrical control assembly. The motor housing is fixedly connected to the bottom cover, and the motor housing and the cage are interference-fitted. The pins include a first pin and a second pin. The bottom cover and the first pin are integrally formed, and the cage and the second pin are integrally formed. During the manufacturing process of the electric pump, the electrical control assembly and the cage are assembled to achieve the electrical connection between the second pin and the electrical control assembly. Subsequently, the bottom cover is assembled to achieve the electrical connection between the first pin and the electrical control assembly. The cumulative tolerances of the bottom cover and the cage may cause the position of the first pin to deviate, resulting in low reliability of the electrical connection between the first pin and the electrical control assembly. Utility Model Content

[0003] Based on this, this application provides an electric pump that helps improve the reliability of the electrical connection between the first pin and the electronic control component.

[0004] To achieve the above objectives, this application adopts the following technical solution:

[0005] An electric pump includes a bottom cover, a first pin, a second pin, a stator assembly, an electrical control assembly, and a cage. The bottom cover is fixedly connected to the cage. One end of the first pin is electrically connected to the electrical control assembly, and the other end of the first pin can be used as a pin for electrical connection with an external power source. One end of the second pin is electrically connected to the stator assembly, and the other end of the second pin is electrically connected to the electrical control assembly. The first pin and the second pin are fixedly connected to the cage.

[0006] In the above technical solution, one end of the first pin is electrically connected to the electronic control component, and the other end of the first pin can be used as a pin terminal when electrically connected to an external power supply; one end of the second pin is electrically connected to the stator assembly, and the other end of the second pin is electrically connected to the electronic control component; the first pin is fixedly connected to the cage, and the second pin is fixedly connected to the cage; the cumulative assembly tolerance between the cage and the electronic control component is small, and the positional deviation of the first pin is relatively small, which is beneficial to improving the reliability of the electrical connection between the first pin and the electronic control component. Attached Figure Description

[0007] Figure 1 This is a cross-sectional schematic diagram of an embodiment of the electric pump of this application;

[0008] Figure 2 for Figure 1 An enlarged schematic diagram of part A in the middle;

[0009] Figure 3 for Figure 1 A first-person view of the central cage;

[0010] Figure 4 for Figure 1 A schematic diagram of the middle cage from a second perspective;

[0011] Figure 5 for Figure 1 A cross-sectional schematic diagram of the middle cage;

[0012] Figure 6 This is a cross-sectional schematic diagram of another embodiment of the electric pump of this application;

[0013] Figure 7 for Figure 6 A first-person view of the central cage;

[0014] Figure 8 for Figure 6 A schematic diagram of the middle cage from a second perspective;

[0015] Figure 9 for Figure 1 or Figure 6 A schematic diagram of the motor housing.

[0016] Reference numerals: 1. Pump housing; 11. Motor housing; 111. Positioning inner wall; 112. Second end face; 113. Sealing groove; 12. Bottom cover; 13. Retainer; 131. Main body; 1311. Partition; 1312. First part; 1313. Second part; 1314. Third part; 1315. First surface; 1316. Second surface; 1317. Positioning part; 1318. Positioning protrusion; 1319. Groove; 132. Connecting part; 1321. Receiving cavity; 133. Through hole; 1331. First through hole; 1332. Second through hole; 13321. First sub-through hole; 13322. Second sub-through hole; 13323. Third sub-through hole; 134. First end face; 14 1. Pump cover; 141. Oil inlet; 142. Oil outlet; 2. First pin; 21. First electrical connection; 22. Second electrical connection; 23. First fixing part; 3. Second pin; 3a. Phase pin; 3b. First phase pin; 3c. Second phase pin; 3d. Third phase pin; 3e. Grounding pin; 31. Third electrical connection; 32. Fourth electrical connection; 33. Second fixing part; 4. Pump rotor; 41. Outer rotor; 42. Inner rotor; 5. Stator assembly; 51. Stator core; 52. Winding; 53. Insulation part; 6. Motor rotor; 7. Pump shaft; 8. Electrical control assembly; 81. Circuit board; 9. Sealing part; 10. Dust cover; 20. Pump chamber; 30. Motor chamber; 40. Electrical control chamber. Detailed Implementation

[0017] To enable those skilled in the art to better understand the technical solutions of this application, the specific embodiments are further described in detail below. Obviously, the embodiments described below are merely some embodiments of this application. For those skilled in the art, other technical solutions can be obtained based on these technical solutions without creative effort.

[0018] Electric pumps can be applied to automotive lubrication and / or cooling systems, providing circulating power for the working medium in these systems, which in turn provide lubricating oil and / or cooling oil to the transmission system. In this application, "A and B fixed connection" means that there is no relative displacement between A and B after the connection, such as A and B being welded together or integrally injection molded. "A and B limiting connection" means that A restricts B's movement in a certain direction, or B restricts A's movement in a certain direction.

[0019] Please refer to Figures 1 to 9 The electric pump includes a pump housing 1, which includes a pump cover 14, a motor housing 11, a cage 13, and a bottom cover 12. The pump cover 14 has an oil inlet 141 and an oil outlet 142. The oil inlet 141 is for the inflow of the working medium, and the oil outlet 142 is for the outflow of the working medium. The pump cover 14 is fixedly connected to the motor housing 11, for example, by screws or bolts. Of course, the pump cover 14 and the motor housing 11 can also be connected by other methods, such as plug-in or snap-fit. The motor housing 11 is fixedly connected to the cage 13, for example, by screws or bolts to the bottom cover 12, which facilitates the assembly and disassembly of the electric pump. The cage 13 is fixedly connected to the bottom cover 12, for example, by screws or bolts to the motor housing 11, which facilitates the assembly and disassembly of the electric pump. In some embodiments, the pump cover 14, motor housing 11, cage 13, and bottom cover 12 can be connected by a single screw, which facilitates the assembly and disassembly of the electric pump. The electric pump includes a pump rotor 4, a stator assembly 5, a motor rotor 6, a pump shaft 7, and an electrical control assembly 8. The stator assembly 5 is located radially outside the motor rotor 6. The pump shaft 7 is drively connected to the motor rotor 6. The electric pump has a pump chamber 20, a motor chamber 30, and an electrical control chamber 40. The pump rotor 4 (or at least a portion of the pump rotor 4) is located in the pump chamber 20. The motor rotor 6 (or at least a portion of the motor rotor 6), at least a portion of the pump shaft 7, and the stator assembly 5 (or at least a portion of the stator assembly 5) are located in the motor chamber 30. The electrical control assembly or at least a portion of the electrical control assembly 8 is located in the electrical control chamber 40. It should be noted that the axial direction of the electric pump, as used here and below, refers to the axial extension direction of the pump shaft. The radial direction of the electric pump is perpendicular to the axial direction of the electric pump. "Radially outside" refers to the direction away from the central axis of the pump shaft 7, while "radially inside" refers to the direction closer to the central axis of the pump shaft 7.

[0020] In one embodiment, please refer to Figures 1 to 5 The pump chamber 20 is connected to the motor chamber 30, and the motor chamber 30 is connected to the electrical control chamber 40. When the electric pump is working, the pump chamber 20 can contain a working medium, which can flow into the motor chamber 30 and contact the stator assembly 5, thereby facilitating heat dissipation from the stator assembly 5. Furthermore, at least a portion of the working medium in the motor chamber 30 can flow into the electrical control chamber 40, which can dissipate heat from the electrical control assembly 8 located in the electrical control chamber 40. In one embodiment, please refer to... Figures 6 to 7 The electric pump has a pump chamber 20, a motor chamber 30, and an electrical control chamber 40. The pump chamber 20 is connected to the motor chamber 30, but the motor chamber 30 and the electrical control chamber 40 are not connected. When the electric pump is working, the pump chamber 20 can contain a working medium, which can flow into the motor chamber 30 and come into contact with the stator assembly 5, thus facilitating heat dissipation from the stator assembly 5. In addition, the motor chamber 30 and the electrical control chamber 40 are not connected, and the working medium in the motor chamber 30 cannot flow into the electrical control chamber 40, thus preventing the electrical control assembly 8 from coming into contact with the working medium and causing the working medium to corrode the electronic components of the electrical control assembly 8.

[0021] Please refer to Figures 1 to 9 The stator assembly 5 includes a stator core 51, windings 52, and insulation 53. The stator core 51 is fixedly connected to the insulation 53, which supports the windings 52. When the electric pump is working, the electronic control assembly 8 controls the current in the windings 52 of the stator assembly 5 to change according to a predetermined pattern, thereby controlling the stator assembly 5 to generate a changing excitation magnetic field. The motor rotor 6 rotates under the action of the excitation magnetic field. The motor rotor 6 can directly or indirectly drive the pump rotor 4 to rotate. The pump shaft 7 is fixedly connected to or driven by the pump rotor 4, and the motor rotor 6 is fixedly connected to or driven by the pump shaft 7. In this embodiment, the pump shaft 7 is driven by the pump rotor 4 and the motor rotor 6. The motor rotor 6 drives the inner rotor 42 to rotate through the pump shaft 7, thereby realizing the rotation of the pump rotor 4. Please refer to... Figure 1 or Figure 6 The outer rotor 41 is located on the outer periphery of the inner rotor 42, and the outer rotor 41 and the inner rotor 42 are internally meshed. In other embodiments, the outer rotor 41 and the inner rotor 42 can also be externally meshed, in which case the outer rotor 41 and the inner rotor 42 are arranged side by side. In this embodiment, the central axis of the outer rotor 41 is offset from the central axis of the inner rotor 42, that is, there is a certain eccentricity between the central axis of the outer rotor 41 and the central axis of the inner rotor 42. When the inner rotor 42 rotates, at least a portion of the external teeth of the inner rotor 42 meshes with at least a portion of the internal teeth of the outer rotor 41, thereby enabling the inner rotor 42 to drive the outer rotor 41 to rotate.

[0022] Please refer to Figures 1 to 9The electric pump includes a first pin 2 and a second pin 3. One end of the first pin 2 is electrically connected to the electronic control component 8, and the other end of the first pin 2 can be used as a pin terminal when electrically connected to an external power source. One end of the second pin 3 is electrically connected to the stator assembly 5, and the other end of the second pin 3 is electrically connected to the electronic control component 8. The first pin 2 is fixedly connected to the cage 13, the second pin 3 is fixedly connected to the cage 13, and the cage 13 is fixedly connected to the bottom cover 12. The cumulative assembly tolerance between the cage 13 and the electronic control component 8 is small, and the positional deviation of the first pin 2 is relatively small, which is beneficial to improving the reliability of the electrical connection between the first pin 2 and the electronic control component 8. Furthermore, fixing the first pin 2, the second pin 3, and the cage 13 is fixedly connected. For example, under the condition that the cage 13 has the same axial height, it is beneficial to reduce the axial height of the bottom cover 12, thereby reducing the axial height of the electric pump. In one embodiment, the first pin 2 and the retainer 13 are integrally formed, and the second pin 3 and the retainer 13 are integrally formed, for example, the retainer 13 is formed by injection molding with the first pin 2 and the second pin 3 as inserts.

[0023] The retainer 13 includes a main body 131 and a connector 132. In the radial direction of the electric pump, the connector 132 extends from the main body 131 in a direction away from the axis of the electric pump. The main body 131 is fixedly connected to the motor housing 11 and to the bottom cover 12. The connector 132 has a receiving cavity 1321, with at least a portion of the first pin 2 located in the receiving cavity 1321. The connector 132's radial extension and the location of at least a portion of the first pin 2 within the receiving cavity 1321 facilitate a reduction in the axial height of the electric pump. In one embodiment, the main body 131 and the connector 132 are integrally formed.

[0024] The first pin 2 includes a first electrical connection portion 21, a second electrical connection portion 22, and a first fixing portion 23. The first electrical connection portion 21 is electrically connected to the electronic control component 8, and the second electrical connection portion 22 can serve as a pin terminal for electrical connection with an external power source. The retainer 13 is an injection-molded part, with a portion of the first fixing portion 23 embedded in the main body portion 131 and another portion of the first fixing portion 23 embedded in the connector portion 132. The second electrical connection portion 22 is located in the receiving cavity 1321. This arrangement helps to increase the structural strength of the first pin 2. At least a portion of the second pin 3 extends along the axial direction of the electric pump. The first electrical connection portion 21 extends from the first fixing portion 23 along the axial direction of the electric pump, and the second electrical connection portion 22 extends from the first fixing portion 23 along the radial direction of the electric pump, which helps to reduce the axial height of the electric pump. Please refer to... Figure 1 and Figure 6 The electric pump also includes a dust cover 10, which is detachably connected to the retainer 13. The dust cover 10 seals the receiving cavity 1321, which helps to prevent dust, moisture and other substances from entering the receiving cavity 1321 and affecting the electrical connection performance of the first pin 2.

[0025] The electronic control assembly 8 includes a circuit board 81. A first electrical connection portion 21 is located in the electronic control cavity 40 and contacts the circuit board 81. In one embodiment, the first electrical connection portion 21 is in a limiting fit with the circuit board 81. For example, the circuit board 81 is press-fitted so that the first electrical connection portion 21 is inserted into the hole of the circuit board 81, so that the first electrical connection portion 21 and the circuit board 81 are in an interference fit.

[0026] The second pin 3 includes a third electrical connection part 31, a fourth electrical connection part 32, and a second fixing part 33. The third electrical connection part 31 is located on one side of the second fixing part 33, and the fourth electrical connection part 32 is located on the other side of the second fixing part 33. Specifically, along the axial direction of the electric pump, the third electrical connection part 31, the second fixing part 33, and the fourth electrical connection part 32 are arranged sequentially. The third electrical connection part 31 is electrically connected to the stator assembly 5, and the fourth electrical connection part 32 is electrically connected to the electrical control assembly 8. The retainer 13 is an injection molded part, and the second fixing part 33 is embedded in the main body part 131. This arrangement helps to improve the structural strength of the second pin 3.

[0027] The main body 131 includes a partition 1311. In the axial direction of the electric pump, the electrical control chamber 40 is located on one side of the partition 1311, and the motor chamber 30 is located on the other side of the partition 1311. The partition 1311 includes a first part 1312 and a second part 1313. The second part 1313 extends from the first part 1312 in a direction away from the axis of the electric pump. At least a portion of the pump shaft 7 is located in the through hole of the first part 1312. The pump shaft 7 is clearance-fitted with the through hole of the first part 1312. The first part 1312 directly or indirectly supports the pump shaft 7. The motor housing 11 directly or indirectly supports the pump shaft 7. The structure of the motor housing 11 supporting the pump shaft 7 and the first part 1312 supporting the pump shaft 7 forms a simply supported beam support structure, which is beneficial to reducing the shaking of the pump shaft 7. Since the pump shaft 7 is fixedly connected to the motor rotor 6, it is also beneficial to reduce the shaking of the motor rotor 6, thereby helping to reduce the noise of the electric pump. The partition 1311 includes a third part 1314 that extends from the second part 1313 toward an axis away from the electric pump, and at least part of the second pin 3 is embedded in the third part 1314.

[0028] Please refer to Figures 3 to 5The electric pump includes a through hole 133. A partition 1311 has a first surface 1315 and a second surface 1316. In the axial direction of the electric pump, the first surface 1315 is closer to the circuit board 81 than the second surface 1316. The through hole 133 penetrates the first surface 1315 and the second surface 1316, connecting to the motor cavity 30 and the electrical control cavity 40. This allows at least a portion of the working medium in the motor cavity 30 to flow into the electrical control cavity 40 through the through hole 133, thus dissipating heat from the electrical control components 8 located in the electrical control cavity 40. In one embodiment, the through hole 133 includes a first through hole 1331. Along the axial direction of the electric pump, the first through hole 1331 penetrates the second part 1313. This ensures the structural strength of the cage 13 while facilitating a lightweight design of the electric pump. The number of first through holes 133 is at least two, and the first through holes 133 are evenly distributed circumferentially along the electric pump, simplifying the cage 13 manufacturing process. In one embodiment, the through hole 133 includes a second through hole 1332. Along the axial direction of the electric pump, the second through hole 1332 penetrates the third part 1314. This ensures the structural strength of the cage 13 while facilitating a lightweight design for the electric pump. In another embodiment, the through hole 133 includes a first through hole 1331 and a second through hole 1332. Along the axial direction of the electric pump, the first through hole 1331 penetrates the second part 1313, and the second through hole 1332 penetrates the third part 1314. This facilitates a lightweight design for the electric pump and increases the flow rate of the working medium from the motor cavity 30 into the electronic control cavity 40 per unit time, thereby improving the heat dissipation of the electronic control component 8. In one embodiment, please refer to... Figure 6 and Figure 7 The stator assembly 5 is located in the motor cavity 30, and the electronic control assembly 8 is located in the electronic control cavity 40. The motor cavity 30 is located on one side of the partition 1311, and the electronic control cavity 40 is located on the other side of the partition 1311. The motor cavity 30 and the electronic control cavity 40 are not connected. The working medium of the motor cavity 30 cannot flow into the electronic control cavity 40, which helps to prevent the electronic control assembly 8 from contacting the working medium and causing the working medium to corrode the electronic components of the electronic control assembly 8. The partition 1311 has a groove 1319, which is recessed from the second surface 1316 toward the first surface 1315. At least part of the pump shaft 7 is located in the groove 1319. The groove wall of the groove 1319 is clearance-fitted with the pump shaft 7. The groove wall of the groove 1319 can serve as an auxiliary bushing for the pump shaft 7, directly or indirectly supporting the pump shaft 7. The motor housing 11 directly or indirectly supports the pump shaft 7. The structure of the motor housing 11 supporting the pump shaft 7 and the groove wall of the groove 1319 supporting the pump shaft 7 forms a simply supported beam support structure, which helps to reduce the shaking of the pump shaft 7. Since the pump shaft 7 is fixedly connected to the motor rotor 6, it further helps to reduce the shaking of the motor rotor 6, thereby helping to reduce the noise of the electric pump.

[0029] Please refer to Figures 1 to 9The second pin 3 is electrically connected to the circuit board 81. In one embodiment, the second pin 3 is positioned within the circuit board 81. Further, the second pin 3 is press-fitted to the circuit board 81, for example, by press-fitting the circuit board 81 so that the fourth electrical connection portion 32 of the second pin 3 is inserted into the hole of the circuit board 81, causing the fourth electrical connection portion 32 to contact the circuit board 81. The second pin 3 includes a ground pin 3e and at least three phase pins 3a. In the circumferential direction of the electric pump, the first electrical connection portion 21 is located between the ground pin 3e and the phase pins 3a; or, the first electrical connection portion 21 is located between two phase pins 3a, which helps to reduce the radial width of the main body 131. The second pin 3 includes at least three phase pins 3a, which are electrically connected to the winding 52. In one embodiment, the phase pins 3a contact the winding 52 to achieve an electrical connection between the phase pins 3a and the winding 52. In one embodiment, please refer to... Figure 3 and Figure 4 The second pin 3 includes a first-phase pin 3b, a second-phase pin 3c, and a third-phase pin 3d. The second pin 3 also includes a grounding pin 3e, which is in a limiting fit with the stator core 51. Furthermore, the grounding pin 3e is interference-fitted with the stator core 51. In the circumferential direction of the electric pump, the first pin is located between the grounding pin 3e and the third-phase pin 3d. Please refer to... Figures 3 to 7 The main body 131 includes a positioning part 1317, which protrudes from the first surface 1315 of the partition part 1311. The circuit board 81 is fixedly connected to the positioning part 1317, for example, by thermal riveting. In one embodiment, please refer to... Figure 3 and Figure 4 The second through hole 1332 includes a first sub-through hole 13321, a second sub-through hole 13322, and a third sub-through hole 13323. Along the circumference of the electric pump, the first sub-through hole 13321 is located between the grounding pin 3e and the positioning part 1317, the second sub-through hole 13322 is located between the positioning part 1317 and the first phase pin 3b, and the third sub-through hole 13323 is located between the first phase pin 3b and the second phase pin 3c. This facilitates the flow of the working medium of the motor cavity 30 into the electrical control cavity 40 through the second through hole 1332, which is beneficial for heat dissipation of the electrical control component 8. Furthermore, it is beneficial for achieving a lightweight design of the electric pump.

[0030] Please refer to Figures 1 to 9The motor housing 11 has a positioning inner wall 111, and the retainer 13 includes a positioning protrusion 1318. Further, the main body 131 includes the positioning protrusion 1318. The positioning protrusion 1318 extends from the second surface 1316 toward the stator assembly, which helps to improve the structural strength of the positioning protrusion 1318. In the radial direction of the electric pump, at least a portion of the positioning protrusion 1318 is located between the insulating portion 53 and the positioning inner wall 111. Further, the positioning protrusion 1318 contacts the positioning inner wall 111. The retainer 13 has a first end face 134, and at least a portion of the positioning protrusion 1318 protrudes from the first end face 134. The motor housing 11 has a second end face 112, and the first end face 134 contacts the second end face 112. The electric pump includes a sealing portion 9. In the axial direction of the electric pump, the positioning protrusion 1318 and the positioning inner wall... The fit of 111 facilitates the installation and positioning of the cage 13. In the radial direction of the electric pump, at least a portion of the positioning protrusion 1318 is located between the insulating portion 53 and the positioning inner wall 111. Since the thickness of the positioning protrusion 1318 is limited in the radial direction of the electric pump, increasing the radial thickness of the positioning protrusion 1318 to achieve at least a portion of the sealing portion located between the motor housing and the cage in the radial direction of the electric pump would require increasing the radial dimensions of both the motor housing and the cage, thus increasing the radial dimension of the electric pump. Therefore, in the axial direction of the electric pump, at least a portion of the sealing portion 9 is located between the first end face 134 and the second end face 112, which helps to reduce the radial dimension of the electric pump. In one embodiment, please refer to... Figure 1 , Figure 2 and Figure 9 The motor housing 11 has a sealing groove 113. In the axial direction of the electric pump, the sealing groove 113 is recessed from the second end face 112 in a direction away from the cage 13, or the sealing groove 113 is recessed from the second end face 112 in a direction closer to the stator assembly 5 (e.g., stator core 51). At least a portion of the sealing part 9 is located in the sealing groove 113. If the motor housing 11 is a metal part, the sealing groove 113 can be formed, for example, by machining, which is beneficial for controlling the size of the sealing groove 113 of the motor housing 11, and thus for improving the fit between the sealing groove 113 and the sealing part 9. In another embodiment, the cage 13 has a sealing groove. In the axial direction of the electric pump, the sealing groove is recessed from the first end face 134 in a direction closer to the bottom cover 12, or the sealing groove is recessed from the first end face 134 in a direction away from the stator assembly 5. When the cage 13 is an injection molded part, the sealing groove can be directly injection molded, which is beneficial for reducing production costs. In one embodiment, Figure 6 The electric pump shown also has the same structure as described above, and is not described again here.

[0031] The above examples illustrate the principles and implementation methods of this application. The descriptions of the embodiments are merely for the purpose of helping to understand the methods and core ideas of this application. It should be noted that those skilled in the art can make various improvements and modifications to this application without departing from its principles, and these improvements and modifications also fall within the protection scope of this application.

Claims

1. An electric pump, characterized in that, The electric pump includes a bottom cover (12), a first pin (2), a second pin (3), a stator assembly (5), an electrical control assembly (8), and a cage (13). The bottom cover (12) is fixedly connected to the cage (13). One end of the first pin (2) is electrically connected to the electrical control assembly (8), and the other end of the first pin (2) can be used as a pin terminal when electrically connected to an external power source. One end of the second pin (3) is electrically connected to the stator assembly (5), and the other end of the second pin (3) is electrically connected to the electrical control assembly (8). The first pin (2) is fixedly connected to the cage (13), and the second pin (3) is fixedly connected to the cage (13).

2. The electric pump according to claim 1, characterized in that, The retainer (13) includes a main body (131) and a connector (132). In the radial direction of the electric pump, the connector (132) extends from the main body (131) in a direction away from the axis of the electric pump. The main body (131) is fixedly connected to the bottom cover (12). The connector (132) has a receiving cavity (1321) in which at least a portion of the first pin (2) is located.

3. The electric pump according to claim 2, characterized in that, The first pin (2) is integral with the retainer (13). The first pin (2) includes a first electrical connection part (21), a second electrical connection part (22) and a first fixing part (23). The first electrical connection part (21) is electrically connected to the electronic control assembly (8). The first electrical connection part (21) extends from the first fixing part (23) along the axial direction of the electric pump, and the second electrical connection part (22) extends from the first fixing part (23) along the radial direction of the electric pump.

4. The electric pump according to claim 3, characterized in that, The main body (131) is an injection molded part, a portion of the first fixing part (23) is embedded in the main body (131), another portion of the first fixing part (23) is embedded in the connector (132), and the second electrical connection part (22) is located in the receiving cavity (1321).

5. The electric pump according to claim 3, characterized in that, The second pin (3) is integral with the cage (13). The second pin (3) includes a ground pin (3e) and at least three phase pins (3a). In the circumference of the electric pump, the first electrical connection (21) is located between the ground pin (3e) and the phase pins (3a); or, the first electrical connection (21) is located between two of the phase pins (3a).

6. The electric pump according to claim 4, characterized in that, The second pin (3) is integral with the cage (13). The second pin (3) includes a ground pin (3e) and at least three phase pins (3a). In the circumference of the electric pump, the first electrical connection (21) is located between the ground pin (3e) and the phase pins (3a); or, the first electrical connection (21) is located between two of the phase pins (3a).

7. The electric pump according to any one of claims 3-6, characterized in that, The main body (131) includes a partition (1311), which includes a first part (1312) and a second part (1313). The second part (1313) extends from the first part (1312) in a direction away from the axis of the electric pump. The electric pump includes a pump shaft (7), which is clearance-fitted with a through hole in the first part (1312). The electric pump includes a first through hole (1331), which penetrates the second part (1313).

8. The electric pump according to claim 7, characterized in that, The electric pump includes a motor cavity (30) and an electrical control cavity (40). The stator assembly (5) is located in the motor cavity (30), and the electrical control assembly (8) is located in the electrical control cavity (40). The motor cavity (30) is connected to the first through hole (1331), and the electrical control cavity (40) is connected to the first through hole (1331).

9. The electric pump according to claim 8, characterized in that, The partition (1311) includes a third part (1314) that extends from the second part (1313) toward the axis away from the electric pump. At least a portion of the second pin (3) is embedded in the third part (1314). The electric pump includes a second through hole (1332) that penetrates the third part (1314). The motor cavity (30) is connected to the second through hole (1332), and the electrical control cavity (40) is connected to the second through hole (1332).

10. The electric pump according to any one of claims 2-6, characterized in that, The main body (131) includes a partition (1311), the electric pump includes a motor cavity (30) and an electrical control cavity (40), the stator assembly (5) is located in the motor cavity (30), the electrical control assembly (8) is located in the electrical control cavity (40), the motor cavity (30) is located on one side of the partition (1311), the electrical control cavity (40) is located on the other side of the partition (1311), and the motor cavity (30) and the electrical control cavity (40) are not connected.

11. The electric pump according to any one of claims 1-6, characterized in that, The electric pump includes a sealing portion (9) and a motor housing (11). The motor housing (11) has a positioning inner wall (111). The cage (13) includes a positioning protrusion (1318). The stator assembly (5) includes an insulating portion (53). In the radial direction of the electric pump, the positioning protrusion (1318) is located between the positioning inner wall (111) and the insulating portion (53). The cage (13) has a first end face (134). At least a portion of the positioning protrusion (1318) protrudes from the first end face (134). The motor housing (11) has a second end face (112). The first end face (134) contacts the second end face (112). In the axial direction of the electric pump, at least a portion of the sealing portion (9) is located between the first end face (134) and the second end face (112).

12. The electric pump according to claim 7, characterized in that, The electric pump includes a sealing portion (9) and a motor housing (11). The motor housing (11) has a positioning inner wall (111). The cage (13) includes a positioning protrusion (1318). The stator assembly (5) includes an insulating portion (53). In the radial direction of the electric pump, the positioning protrusion (1318) is located between the positioning inner wall (111) and the insulating portion (53). The cage (13) has a first end face (134). At least a portion of the positioning protrusion (1318) protrudes from the first end face (134). The motor housing (11) has a second end face (112). The first end face (134) contacts the second end face (112). In the axial direction of the electric pump, at least a portion of the sealing portion (9) is located between the first end face (134) and the second end face (112).

13. The electric pump according to claim 8, characterized in that, The electric pump includes a sealing portion (9) and a motor housing (11). The motor housing (11) has a positioning inner wall (111). The cage (13) includes a positioning protrusion (1318). The stator assembly (5) includes an insulating portion (53). In the radial direction of the electric pump, the positioning protrusion (1318) is located between the positioning inner wall (111) and the insulating portion (53). The cage (13) has a first end face (134). At least a portion of the positioning protrusion (1318) protrudes from the first end face (134). The motor housing (11) has a second end face (112). The first end face (134) contacts the second end face (112). In the axial direction of the electric pump, at least a portion of the sealing portion (9) is located between the first end face (134) and the second end face (112).

14. The electric pump according to claim 9, characterized in that, The electric pump includes a sealing portion (9) and a motor housing (11). The motor housing (11) has a positioning inner wall (111). The cage (13) includes a positioning protrusion (1318). The stator assembly (5) includes an insulating portion (53). In the radial direction of the electric pump, the positioning protrusion (1318) is located between the positioning inner wall (111) and the insulating portion (53). The cage (13) has a first end face (134). At least a portion of the positioning protrusion (1318) protrudes from the first end face (134). The motor housing (11) has a second end face (112). The first end face (134) contacts the second end face (112). In the axial direction of the electric pump, at least a portion of the sealing portion (9) is located between the first end face (134) and the second end face (112).

15. The electric pump according to claim 10, characterized in that, The electric pump includes a sealing portion (9) and a motor housing (11). The motor housing (11) has a positioning inner wall (111). The cage (13) includes a positioning protrusion (1318). The stator assembly (5) includes an insulating portion (53). In the radial direction of the electric pump, the positioning protrusion (1318) is located between the positioning inner wall (111) and the insulating portion (53). The cage (13) has a first end face (134). At least a portion of the positioning protrusion (1318) protrudes from the first end face (134). The motor housing (11) has a second end face (112). The first end face (134) contacts the second end face (112). In the axial direction of the electric pump, at least a portion of the sealing portion (9) is located between the first end face (134) and the second end face (112).

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