Electric pump

Abstract

The invention discloses an electric pump which comprises a control panel assembly and a stator assembly, the stator assembly comprises a stator winding and a stator shell, the stator shell is formed by at least taking the stator winding as an insert in an injection molding mode, the stator shell comprises a bottom, the electric pump comprises a partition part, and the partition part is far away from the stator winding relative to the bottom in the axial direction of the electric pump. The bottom and the partition portion are arranged in a sealed mode, the bottom comprises a front bottom face and a reverse bottom face, the front bottom face is far away from the stator winding relative to the reverse bottom face in the axial direction of the electric pump, the partition portion comprises a contact wall and a connecting wall, and the contact wall is close to the front bottom face relative to the connecting wall in the axial direction of the electric pump. The wall part corresponding to the communicating cavity comprises a part of front bottom surface and a part of contact wall; the control panel assembly is in direct contact with the connecting wall or a heat conduction part is filled between the connecting wall and the control panel assembly. In this way, heat dissipation of the control panel assembly is facilitated.

Description

Technical Field

[0001] This application relates to the field of fluid control, and particularly to an electric pump.

Background Art

[0002] The electric pump includes a control board assembly. During the operation of the electric pump, the control board assembly will generate a certain amount of heat. If this part of the heat cannot be dissipated in time, it will affect the service life of the control board assembly.

Summary of the Invention

[0003] The purpose of the present invention is to provide an electric pump, which is beneficial to dissipating heat from the control board assembly.

[0004] To achieve the above purpose, an embodiment provided in this application adopts the following technical solution: An electric pump includes a control board assembly and a stator assembly. The stator assembly includes a stator winding and a stator housing. The stator housing is at least injection-molded with the stator winding as an insert. The stator housing includes a bottom. The electric pump includes a partition. Along the axial direction of the electric pump, the partition is farther from the stator winding than the bottom. The bottom and the partition are hermetically arranged. The bottom includes a positive bottom surface and a negative bottom surface. Along the axial direction of the electric pump, the positive bottom surface is farther from the stator winding than the negative bottom surface. The partition includes a contact wall and a connecting wall. Along the axial direction of the electric pump, the contact wall is closer to the positive bottom surface than the connecting wall. The electric pump has a communication cavity, and the communication cavity can flow or store a working medium. The wall portion corresponding to the communication cavity includes a part of the positive bottom surface and a part of the contact wall. The control board assembly is in direct contact with the connecting wall or a heat-conducting part is filled between the connecting wall and the control board assembly.

[0005] In an embodiment of this application, the electric pump has a communication cavity, and the communication cavity can flow or store a working medium. The wall portion corresponding to the communication cavity includes a part of the positive bottom surface and a part of the contact wall. The control board assembly is in direct contact with the connecting wall or a heat-conducting part is filled between the connecting wall and the control board assembly. The heat generated by the control board assembly can be transferred to the working medium in the communication cavity. In this way, it is beneficial to dissipate heat from the control board assembly.

Description of the Drawings

[0006] Figure 1 is a three-dimensional structural schematic diagram of the first embodiment of the electric pump of this application;

[0007] Figure 2 is Figure 1 the exploded structural schematic diagram of the first embodiment of the electric pump in

[0008] Figure 3 is Figure 1 the sectional structural schematic diagram of the first embodiment of the electric pump in along the X-X section;

[0009] Figure 4 isFigure 1 Schematic diagram of the three-dimensional structure of the first embodiment of the middle stator winding;

[0010] Figure 5 is Figure 1 Schematic diagram of the three-dimensional structure of the first embodiment of the first component in the middle;

[0011] Figure 6 is Figure 1 Schematic diagram of the three-dimensional structure of the first embodiment of the middle stator assembly;

[0012] Figure 7 is Figure 6 Schematic diagram of the sectional structure along the Y-Y section in the middle;

[0013] Figure 8 is Figure 6 Schematic diagram of the front view structure along the C direction in the middle;

[0014] Figure 9 is Figure 8 Schematic diagram of the enlarged structure I in the middle;

[0015] Figure 10 is Figure 6 Schematic diagram of the three-dimensional structure of the second housing in one direction in the middle;

[0016] Figure 11 is Figure 2 Schematic diagram of the three-dimensional structure of the first embodiment of the bottom shell in one direction;

[0017] Figure 12 is Figure 2 Schematic diagram of the three-dimensional structure of the first embodiment of the bottom shell in another direction;

[0018] Figure 13 is Figure 12 Schematic diagram of the sectional structure along the Z-Z direction in the middle;

[0019] Figure 14 is Figure 1 Schematic diagram of the sectional structure along the X-X section of the second embodiment of the electric pump in the middle;

[0020] Figure 15 is Figure 14 Schematic diagram of the front view structure along the D direction after removing the end cover and the control board assembly in the middle;

[0021] Figure 16 is Figure 1 Schematic diagram of the sectional structure along the X-X section of the third embodiment of the electric pump in the middle;

[0022] Figure 17 is Figure 1 Schematic diagram of the sectional structure along the X-X section of the fourth embodiment of the electric pump in the middle;

[0023] Figure 18 is Figure 2 、 Figure 14 、 Figure 16 、 Figure 17 Schematic perspective view of the pump cover in one direction;

[0024] Figure 19 is Figure 2 、 Figure 14 、 Figure 16 、 Figure 17 Schematic perspective view of the control board assembly in one direction;

[0025] Figure 20 is Figure 2 、 Figure 14 、 Figure 16 、 Figure 17 Schematic perspective view of the control board assembly in another direction;

[0026] Figure 21 Schematic view of the projection lines of the first circumferential side portion, second circumferential side portion, third circumferential side portion, fourth circumferential side portion, and stator winding onto the first reference plane;

[0027] Figure 22 is Figure 1 Schematic view of the cross-section along X-X of the fifth embodiment of the electric pump;

[0028] Figure 23 is Figure 3 Schematic view of the enlarged structure at II;

[0029] Figure 24 is Figure 3 Schematic view of the enlarged structure at III;

[0030] In the drawings: 100, electric pump;

[0031] 11, pump cover; 111, inlet; 112, outlet;

[0032] 12, stator assembly; 121, stator housing; 1211, first housing; 1212, second housing;

[0033] 1212a, cylindrical portion; 1212b, radially extending portion; 1212c, outer peripheral side wall portion; 1212d, bottom;

[0034] 1212e, outer wall portion; 1212f, inner wall portion; 1212g, positive bottom surface; 1212h, negative bottom surface;

[0035] 1212m, first part; 1212n, second part;

[0036] 122. Stator winding; 1221. Stator core; 1222. Insulation skeleton; 1223. Winding;

[0037] 13. Partition part; 131. Contact wall; 132. Connection wall;

[0038] 14. Inner cavity; 141. Rotor cavity; 1411. Bottom surface; 142. Impeller cavity; 1421. Spiral channel cavity; 1422. Non - spiral channel cavity;

[0039] 15. Rotating assembly; 151. Rotor assembly; 152. Impeller assembly;

[0040] 16. Connecting cavity; 161. Peripheral side part; 1611. First peripheral side part; 1611a. First sub - peripheral side part; 1611b. Second sub - peripheral side part; 1612a. Third sub - peripheral side part; 1612b. Fourth sub - peripheral side part; 1612. Second peripheral side part; 1613. Third peripheral side part; 1613a. Fifth sub - peripheral side part;

[0041] 1613b. Sixth sub - peripheral side part; 1614. Fourth peripheral side part; 1614a. Seventh sub - peripheral side part;

[0042] 1614b. Eighth sub - peripheral side part;

[0043] 17. Through - channel; 18. Shaft; 181. Fixed part; 182. Extended part; 1811. First end part;

[0044] 19. Heat - conducting part; 20. First return channel; 20’. Second return channel; 21. End 25 cover;

[0045] 22. Control board assembly; 221. Substrate; 222. Electronic components; 2211. Front side; 2212. Back side; 2221. Heat - generating electronic components;

[0046] 23. Inflow channel; 231. First wall part; 232. Second wall part; 24. Stator cavity; 25. First component; 251. Upper end part; 252. Lower end part; 253. Inner side part; 254. Outer side part; 26. Bottom case; 261. Support part; 2611. First sub - part; 2612. Second sub - part; 27. Conductive part; 271. Conductive member; 272. Connector; 28. Control cavity; 101. First reference plane; S1. First heat dissipation path; S2. Second heat dissipation path; S3. Third heat dissipation path; S4. Fourth heat dissipation path.

Detailed implementation manners

[0047] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0048] The following further elaborates on the specific embodiments of the present application in conjunction with the accompanying drawings. First of all, it should be noted that the orientation terms such as up, down, left, right, front, back, inner, outer, top, bottom, etc. mentioned or possibly mentioned in the specification of the present invention are defined relative to the structure shown in the corresponding drawings. They are relative concepts and may therefore change accordingly depending on their different positions and different usage states. Therefore, these or other orientation terms should not be construed as restrictive terms.

[0049] The electric pump in the following embodiments can provide flowing power for the working medium of the vehicle thermal management system. The working medium can be water or an aqueous solution, such as an aqueous solution including 50% ethylene glycol. Of course, the working medium can also be other substances.

[0050] See Figures 1 to 24As shown in the figure, the present application provides an electric pump 100, which includes a pump cover 11, a stator assembly 12, a partition 13, a rotating assembly 15 and a shaft 18; the stator assembly 12 includes a stator winding 122 and a stator housing 121, and the stator winding 122 includes a stator core 1221, an insulating skeleton 1222 and a winding 1223. The pump cover 11 is fixedly connected to the stator assembly 12 in a sealed manner. It should be noted that the sealed fixation here means that when the electric pump 100 is working, the working medium inside the electric pump 100 will not leak to the outside of the electric pump 100 through the joint surface between the pump cover 11 and the stator assembly 12. The shaft 18 is fixedly connected to the stator assembly 12. Specifically, the shaft 18 is injection-molded and fixed to the stator housing 121. It can be understood that a part of the shaft 18 is embedded in the stator housing 121. Specifically, the shaft 18 includes a fixing portion 181, and the fixing portion 181 is embedded in the stator housing 121. The electric pump 100 has an inner cavity 14, and the rotating assembly 15 is located in the inner cavity 14. The inner cavity 14 includes a rotor cavity 141 and an impeller cavity 142, and the rotor cavity 141 and the impeller cavity 142 are communicated. The inner cavity 14 can have the working medium flowing through it. The rotating assembly 15 includes a rotor assembly 151 and an impeller assembly 152, and the rotor assembly 151 includes a permanent magnet. At least a part of the rotor assembly 151 is located in the rotor cavity 141, and the impeller assembly 152 is located in the impeller cavity 142. In a specific embodiment, at least a part of the other end of the shaft 18 is located in the rotor cavity 141, at least a part of the rotating assembly 15 is sleeved on the outer periphery of the shaft 18, and a part of the shaft 18 is fixed to the stator housing 121, and the rotating assembly 15 can rotate around the shaft 18. Of course, as another implementation manner, the rotating assembly 15 and the shaft 18 are fixedly connected, and the shaft 18 rotates together with the rotating assembly 15. The electric pump 100 includes a control board assembly 22, and the control board assembly 22 is electrically connected to the stator assembly 12. Of course, as another implementation manner, the electric pump 100 may not include the pump cover 11, and the pump cover 11 is integrated on an external structure. Such a setting is more conducive to the integrated design of the electric pump 100, making the structure of the electric pump 100 more compact, and more conducive to the miniaturization and light weight of the structure of the electric pump 100. The pump cover 11 has an inlet 111 and an outlet 112. The inlet 111 is used for the working medium to flow into the electric pump 100, and the outlet 112 is used for the working medium to flow out of the electric pump 100. When the electric pump 100 is working, the electric pump 100 is connected to an external power supply, and by controlling the current of the stator winding 122, the excitation magnetic field generated by the stator winding 122 is controlled. The rotating assembly 15 rotates around the shaft 18 under the action of the excitation magnetic field, so that the working medium entering the inner cavity 14 through the inlet 111 makes a rotational motion along with the rotating assembly 15, and the working medium will leave the electric pump 100 through the outlet 112 under the action of centrifugal force.

[0051] See Figure 4As shown, the stator winding 122 includes a stator core 1221, an insulating skeleton 1222, and windings 1223. The number of windings 1223 is at least three. The insulating skeleton 1222 covers at least part of the surface of the stator core 1221. The insulating skeleton 1222 is used to isolate the windings 1223 from the stator core 1221, so that the windings 1223 and the stator core 1221 are electrically insulated from each other. The insulating skeleton 1222 and the stator core 1221 can be an integral structural member. Specifically, as an implementation method, the stator core 1221 is used as an insert for injection molding to form the insulating skeleton 1222. Of course, as other implementation methods, the insulating skeleton 1222 and the stator core 1221 are separately arranged. Here, "separately arranged" means that the insulating skeleton 1222 and the stator core 1221 are respectively processed into two separate parts and then assembled. They are connected in a limiting manner or a fixed connection by means of assembly. In this embodiment, the insulating skeleton 1222 is formed by injection molding with the stator core 1221 as an insert. It can be understood that the stator core 1221 and the insulating skeleton 1222 are an integral structure. The windings 1223 are wound around the insulating skeleton 1222. As a specific embodiment, the windings 1223 include nine windings. Of course, as other implementation methods, the windings 1223 can also include other numbers of windings, such as three, six, twelve, or other numbers.

[0052] During the operation of the electric pump, the control board assembly will generate a certain amount of heat. If this part of the heat cannot be dissipated in time, it will affect the life of the control board assembly.

[0053] As an implementation method, please refer to Figures 1 to 24As shown in the figure, the electric pump 100 includes a control board assembly 22 and a stator assembly 12. The stator assembly 12 includes a stator winding 122 and a stator housing 121. The stator housing 121 is at least injection-molded with the stator winding 122 as an insert. The stator housing 121 includes a bottom 1212d. The electric pump 100 includes a partition 13. Along the axial direction of the electric pump 100, the partition 13 is farther from the stator winding 122 relative to the bottom 1212d. The bottom 1212d and the partition 13 are hermetically arranged. The bottom 1212d includes a positive bottom surface 1212g and a negative bottom surface 1212h. Along the axial direction of the electric pump 100, the positive bottom surface 1212g is farther from the stator winding 122 relative to the negative bottom surface 1212h. Specifically, the electric pump 100 includes a rotor cavity 141. The wall portion corresponding to the rotor cavity 141 includes a part of the negative bottom surface 1212h. The partition 13 includes a contact wall 131 and a connecting wall 132. Along the axial direction of the electric pump 100, the contact wall 131 is closer to the positive bottom surface 1212g relative to the connecting wall 132. The electric pump 100 has a communication cavity 16. The communication cavity 16 can flow or store a working medium. The wall portion corresponding to the communication cavity 16 includes a part of the positive bottom surface 1212g and a part of the contact wall 131. The control board assembly 22 is in direct contact with the connecting wall 132 or a heat-conducting portion 19 is filled between the connecting wall and the control board assembly 22. It should be noted that the above "hermetically arranged" means that the working medium in the communication cavity 16 will not leak to the outside of the communication cavity 16 through the joint surface between the bottom 1212d and the partition 13. Herein and hereinafter, the "axial direction of the electric pump" refers to the direction in which the axis of the electric pump extends. The radial direction of the electric pump 100 is the direction perpendicular to the axial direction of the electric pump. In this way, first, the heat generated by the control board assembly can be transferred to the working medium in the communication cavity, which is beneficial to dissipating heat from the control board assembly and thus beneficial to improving the service life of the electric pump. Second, since the stator housing is made of injection-molded material, compared with the technical solution in which the control board assembly is in direct contact with the bottom of the stator housing, it is beneficial to improve the heat dissipation efficiency of the control board assembly.

[0054] As an implementation method, please refer to Figure 1 、 Figure 19 、 Figure 20 、 Figure 22 As shown in the figure, the control board assembly 22 includes a substrate 221 and electronic components 222. The substrate 221 includes a front surface 2211 and a back surface 2212. Along the axial direction of the electric pump 100, the front surface 2211 is closer to the partition 13 than the back surface 2212. The electronic components 222 are arranged on the back surface 2212. At least the front surface 2211 is in direct contact with the partition 13, or a heat-conducting portion is filled between at least a part of the front surface 2211 and the partition 13. The heat-conducting portion 19 includes but is not limited to heat-conducting silica gel or heat-conducting silicone grease. In this way, it is beneficial to dissipate heat from the control board assembly 22. Figure 22Only the embodiment in which at least the front surface 2211 is in direct contact with the partition 13 is shown. The embodiment in which a heat-conducting part 19 is filled between at least a part of the front surface 2211 and the partition 13 is not shown in the figure.

[0055] As another implementation, please refer to Figures 1 to 3 、 Figure 19 、 Figure 20 As shown, the control board assembly 22 includes a substrate 221 and electronic components 222. The substrate 221 includes a front surface 2211 and a back surface 2212. Along the axial direction of the electric pump 100, the front surface 2211 is closer to the partition 13 than the back surface 2212. A gap is formed between the front surface 2211 and the partition 13. At least a part of the electronic components 222 are arranged between the front surface 2211 and the partition 13, and a heat-conducting part 19 is filled between the front surface 2211 and the partition 13. The heat-conducting part 19 includes but is not limited to heat-conducting silica gel or heat-conducting silicone grease. In this way, the heat dissipation of some of the electronic components arranged on the front surface of the substrate can be accelerated.

[0056] Furthermore, please refer to Figures 1 to 3 、 Figure 19 、 Figure 20 As shown, the electronic components 222 include heat-generating electronic components 2221. At least a part of the heat-generating electronic components 2221 are arranged on the front surface 2211 of the substrate 221. At least a part of the heat-generating electronic components 2221 are in direct contact with the partition 13, or a heat-conducting part 19 is filled between at least a part of the heat-generating electronic components 2221 and the partition 13. The heat-generating electronic components 2221 can be arranged on the front surface 2211, which can accelerate the heat dissipation of the heat-generating electronic components 2221 and is beneficial to improving the service life of the control board assembly. In this embodiment, the heat-generating electronic components include common heat-generating electronic components such as diodes, MOS transistors, inductors, resistors, and capacitors.

[0057] Please refer to Figures 1 to 24As shown in the figure, to increase the area of the communication cavity 16 in the radial direction of the electric pump 100, and thus increase the heat dissipation area of the control board assembly 22. As an implementation method, the wall portion corresponding to the communication cavity 16 includes a peripheral side portion 161. Define a first reference plane 101, and the first reference plane 101 is a plane parallel to the positive bottom surface 1212g of the bottom 1212d. The peripheral side portion 161 includes a first peripheral side portion 1611 and a second peripheral side portion 1612. The first peripheral side portion 1611 and the second peripheral side portion 1612 are arranged oppositely. Project the first peripheral side portion 1611, the second peripheral side portion 1612, and the stator winding 122 onto the first reference plane 101. Along the radial direction of the electric pump 100, the projection contour line L1 of the first peripheral side portion 1611 and the projection contour line L2 of the second peripheral side portion 1612 are located radially outside the projection contour line L5 of the outer side portion of the stator winding 122. It should be noted that the "radial direction of the electric pump" is perpendicular to the "axial direction of the electric pump". In this way, firstly, it is beneficial to increase the area of the communication cavity in the radial direction of the electric pump, and thus beneficial to improve the heat dissipation efficiency of the control board assembly. Secondly, the increase in the area of the connection cavity in the radial direction of the electric pump is beneficial to increase the layout space of the heat-generating electronic components. At the same time, it increases the selection space of the electronic components. For example, electronic components with lower costs can be selected, laying a certain foundation for reducing the cost of the electric pump. Specifically, the first peripheral side portion and the second peripheral side portion can all protrude from the positive bottom surface of the bottom; the first peripheral side portion and the second peripheral side portion can all protrude from the contact wall; of course, the first peripheral side portion and the second peripheral side portion can also partially protrude from the positive bottom surface, and the other part of the first peripheral side portion and the second peripheral side portion protrudes from the contact wall. In this embodiment, the first peripheral side portion 1611 includes a first sub-peripheral side portion 1611a and a second sub-peripheral side portion 1611b, and the second peripheral side portion 1612 includes a third sub-peripheral side portion 1612a and a fourth sub-peripheral side portion 1612b; the first sub-peripheral side portion 1611a and the third sub-peripheral side portion 1612a protrude from the positive bottom surface 1212g, and the second sub-peripheral side portion 1611b and the fourth sub-peripheral side portion 1612b protrude from the contact wall 131. The first sub-peripheral side portion 1611a and the third sub-peripheral side portion 1612a are welded and sealed and fixed, and the second sub-peripheral side portion 1611b and the fourth sub-peripheral side portion 1612b are welded and sealed and fixed; the welding methods include but are not limited to laser welding, infrared welding, ultrasonic welding, and rotary friction welding. In this way, it is more beneficial to the processing and manufacturing of the peripheral side portion.

[0058] Further, please refer to Figures 1 to 24As shown, as an implementation manner, the peripheral side portion 161 includes a third peripheral side portion 1613 and a fourth peripheral side portion 1614. The third peripheral side portion 1613 and the fourth peripheral side portion 1614 are disposed opposite to each other. The first peripheral side portion 1611 and the second peripheral side portion 1612 are connected through the third peripheral side portion 1613 and the fourth peripheral side portion 1614. Project the third peripheral side portion 1613, the fourth peripheral side portion 1614, and the stator winding 122 onto the first reference plane 101. Along the radial direction of the electric pump 100, the projection contour line L3 of a part of the third peripheral side portion 1613 and the projection contour line L4 of a part of the fourth peripheral side portion 1614 are located radially inside the projection contour line L5 of the outer side portion of the stator winding 122. In this way, other components can be arranged in the area between the third peripheral side portion 1613, the fourth peripheral side portion 1614 and the outer side portion of the stator winding 122. For example, along the circumferential direction of the electric pump 100, a part of the conductive member 271 is arranged in the area between the third peripheral side portion 1613 or the fourth peripheral side portion 1614 and the outer side portion of the stator winding 122. This is beneficial to simplifying the structure of the electric pump 100 and laying a certain foundation for the miniaturization of the electric pump 100. Specifically, the third peripheral side portion 1613 and the fourth peripheral side portion 1614 can all protrude from the positive bottom surface 1212g of the bottom 1212d; the third peripheral side portion 1613 and the fourth peripheral side portion 1614 can all protrude from the contact wall 131; of course, the third peripheral side portion 1613 and the fourth peripheral side portion 1614 can also partially protrude from the positive bottom surface 1212g, and the other part of the third peripheral side portion 1613 and the fourth peripheral side portion 1614 protrudes from the contact wall 131. In this embodiment, the third peripheral side portion 1613 includes a fifth sub-peripheral side portion 1613a and a sixth sub-peripheral side portion 1613b, and the fourth peripheral side portion 1614 includes a seventh sub-peripheral side portion 1614a and an eighth sub-peripheral side portion 1614b; the fifth sub-peripheral side portion 1613a and the seventh sub-peripheral side portion 1614a protrude from the positive bottom surface 1212g, the sixth sub-peripheral side portion 1613b and the eighth sub-peripheral side portion 1614b protrude from the contact wall 131, the fifth sub-peripheral side portion 1613a and the sixth sub-peripheral side portion 1613b are hermetically fixed; the seventh sub-peripheral side portion 1614a and the eighth sub-peripheral side portion 1614b are hermetically fixed. Specifically, the fifth sub-peripheral side portion 1613a and the sixth sub-peripheral side portion 1613b are welded and hermetically fixed; the seventh sub-peripheral side portion 1614a and the eighth sub-peripheral side portion 1614b are welded and hermetically fixed. The welding methods include but are not limited to laser welding, infrared welding, ultrasonic welding, and rotary friction welding. In this way, it is more beneficial to the forming of the peripheral side portion.

[0059] Please refer to Figures 1 to 24As shown, the stator housing 121 includes a first housing 1211 and a second housing 1212. The first housing 1211 is injection-molded with at least the stator winding 122 as an insert. In this embodiment, the first housing 1211 is injection-molded with the stator winding 122 and the conductive member 271 as inserts. Define the first assembly 25, and the first assembly 25 includes the stator winding 122 and the first housing 1211. The second housing 1212 is injection-molded with at least the first assembly 25. The second housing 1212 includes a bottom 1212d and a cylindrical portion 1212a. Along the axial direction of the electric pump 100, the bottom 1212d is located on one side of the cylindrical portion 1212a. The electric pump 100 has a rotor cavity 141, and the wall portion corresponding to the rotor cavity 141 includes the cylindrical portion 1212a and a part of the bottom 1212d. Specifically, the bottom 1212d includes a reverse bottom surface 1212h. Along the axial direction of the electric pump 100, the positive bottom surface 1212g is farther from the stator winding 122 than the reverse bottom surface 1212h. The wall portion corresponding to the rotor cavity 141 includes the cylindrical portion 1212a and a part of the reverse bottom surface 1212h. Define the part of the reverse bottom surface 1212h that forms the wall portion of the rotor cavity 141 as the bottom surface 1411. Along the radial direction of the electric pump 100, the area of the communication cavity 16 is larger than the area of the bottom surface 1411. The working medium flowing in the rotor cavity 141 can dissipate heat from a part of the first assembly 25 near the inner side portion 253. The communication cavity 16 is arranged near the lower end portion 252 of the first assembly 25, and the area of the communication cavity 16 is larger than the area of the bottom surface 1411, which is beneficial to dissipating heat from the first assembly 25 near the lower end portion 252. In this way, while dissipating heat from the control board assembly 22, it is beneficial to increase the heat dissipation area of the stator assembly 12, and thus beneficial to dissipating heat from the stator assembly 12. Third, along the radial direction of the electric pump 100, the area of the communication cavity 16 is larger than the area of the bottom surface 1411, which is beneficial to increasing the heat dissipation area of the control board assembly and improving the heat dissipation efficiency of the control board assembly.

[0060] Please refer to Figures 1 to 24As shown, to simplify the structure of the electric pump, as an implementation, the electric pump 100 includes an inlet flow channel 23. The electric pump 100 includes the inlet flow channel 23. The wall forming the inlet flow channel 23 is at least partially located in the second housing 1212. At least a part of the inlet flow channel 23 is in the axial direction of the electric pump 100. Along the radial direction of the electric pump 100, the inlet flow channel 23 is located radially outside the first component 25. The inlet flow channel 23 can allow the working medium to flow through. One end of the inlet flow channel 23 communicates with the communication cavity 16. The electric pump 100 includes an impeller cavity 142. The other end of the inlet flow channel 23 communicates with the impeller cavity 142. In this way, the working medium flowing in the impeller cavity 142 can be borrowed to replenish the communication cavity 16. This method has the following advantages: First, it is beneficial to simplify the structure of the electric pump 100. Second, by arranging the inlet flow channel 23 radially outside the first component 25, compared with the technical solution in which part of the heat generated by the winding part near the outer wall of the stator winding is usually dissipated by air cooling, in this application, the working medium flowing or stored in the inlet flow channel dissipates heat from the winding part of the outer wall near the stator winding, which is beneficial to improving the heat dissipation efficiency. Since the main heat source generated in the stator assembly 12 is the stator winding 122, it is beneficial to improve the heat dissipation efficiency of the stator assembly 12. The heat generated by the stator assembly 12 can be timely dissipated to the outside of the electric pump, laying a certain foundation for improving the power density of the electric pump 100 and also laying a certain foundation for the miniaturization of the electric pump 100. It can be understood that if the heat generated by the stator winding 122 is timely dissipated, the power density of the electric pump 100 can be further improved, making the structural dimensions of the stator core 1221 of the stator winding 122 more compact, laying a certain foundation for the miniaturization of the electric pump 100. In this embodiment, the inner cavity 14 includes a rotor cavity 141 and an impeller cavity 142. The inner cavity 14 can allow the working medium to flow through. Along the radial direction of the electric pump 100, the inlet flow channel 23 is located radially outside the first component 25. The inlet flow channel 23 can allow the working medium to flow through, which is beneficial to dissipating heat from a part of the stator winding 122 in the direction away from the central axis of the electric pump 100, and thus is beneficial to improving the heat dissipation efficiency of the stator winding 122. Of course, as other implementation manners, the rotor cavity 141 of the inner cavity 14 may not allow the working medium to flow through.

[0061] As an implementation, please refer to Figures 1 to 24As shown, the second housing 1212 is formed by insert molding with the first component 25 and the shaft 18 as inserts. The second housing 1212 has a partial inner cavity 14. Specifically, the second housing 1212 forms a rotor cavity 141. The shaft 18 includes a fixed portion 181 and an extending portion 182. The fixed portion 181 is injection-molded and fixed to the second housing 1212. The extending portion 182 extends along the axial direction of the electric pump 100 within the inner cavity 14. Specifically, the extending portion 182 extends within the rotor cavity 141. The rotating assembly 15 is in clearance fit with the extending portion 182, that is to say, the rotating assembly 15 can rotate around the extending portion 182. The insert for forming the second housing 1212 includes the shaft 18. In this way, the second housing 1212 has a rotor cavity 141, that is to say, the wall portion corresponding to the formation of the rotor cavity 141 is formed during the second injection molding, which is beneficial to reducing the joint surface between the first injection molding and the second injection molding, and further beneficial to reducing the risk of leakage of the electric pump through the above joint surface. Further, the fixed portion 181 includes a first end portion 1811, and the first end portion 1811 is completely embedded in the second housing 1212, that is to say, the second housing 1212 covers the first end portion 1811. In this way, further, the risk of leakage of the working medium through the wall portion corresponding to the rotor cavity 141 is reduced.

[0062] Please refer to Figures 1 to 24As shown, as an implementation, the second housing 1212 includes a cylindrical portion 1212a, a radially extending portion 1212b, an outer peripheral side wall portion 1212c, and a bottom portion 1212d. Along the axial direction of the electric pump 100, the radially extending portion 1212b is located on one side of the cylindrical portion 1212a. Specifically, the radially extending portion 1212b covers the upper end portion 251 of the first component 25. The bottom portion 1212d is located on the other side of the cylindrical portion 1212a, and the bottom portion 1212d covers a part of the lower end portion 252 of the first component 25. Along the radial direction of the electric pump 100, the outer peripheral side wall portion 1212c is located radially outside the outer side portion 254 of the first component 25, and the cylindrical portion 1212a is located radially inside the inner side portion 253 of the first component 25. The electric pump 100 has a stator cavity 24, and a part of the first component 25 is located in the stator cavity 24. The wall portion corresponding to the stator cavity 24 includes the cylindrical portion 1212a, the radially extending portion 1212b, a part of the outer peripheral side wall portion 1212c, and a part of the bottom portion 1212d. Along the axial direction of the electric pump 100, a part of the inflow channel 23 extends in the outer peripheral side wall portion 1212c. The wall portion corresponding to the rotor cavity 141 includes the cylindrical portion 1212a and a part of the bottom portion 1212d. At least a part of the rotor assembly 151 is located in the rotor cavity 141. The rotor cavity 141 and the impeller cavity 142 communicate with each other to allow the working medium to flow through. Along the radial direction of the electric pump 100, the rotor cavity 141 is located radially inside the first component 25. The wall portion corresponding to the impeller cavity 142 includes the radially extending portion 1212b. In this way, the upper end portion 251, the inner side portion 253, and the outer side portion 254 of the first component 25 will be covered by a part of the working medium flow path. The flow of the working medium is beneficial to carry the heat generated by the stator winding 122 away to the outside of the electric pump 100. In this way, it is beneficial to increase the heat dissipation area of the stator winding 122, and thus beneficial to dissipate heat from the stator assembly 12.

[0063] Further, please refer to Figures 1 to 24 As shown, as an implementation, along the radial direction of the electric pump 100, the wall portion corresponding to the inflow channel 23 includes a first wall portion 231 and a second wall portion 232. Along the radial direction of the electric pump 100, the first wall portion 231 is farther from the stator winding 122 than the second wall portion 232. The outer peripheral side wall portion 1212c includes an outer wall portion 1212e and an inner wall portion 1212f. Along the radial direction of the electric pump 100, the outer wall portion 1212e is farther from the stator winding 122 than the inner wall portion 1212f. Along the radial direction of the electric pump 100, the second wall portion 232 is farther from the stator winding 122 than the inner wall portion 1212f. In this way, the inflow channel 23 is completely located within the second housing 1212, which is beneficial to reducing the risk of leakage of the working medium in the inflow channel 23. Further, along the radial direction of the electric pump 100, the first wall portion 231 is closer to the stator winding than the outer wall portion 1212e.

[0064] Please refer to Figures 1 to 24 As shown, to further simplify the structure of the electric pump 100, the working medium entering the inflow channel 23 can utilize the working medium in the inner cavity of the electric pump 100. As an implementation method, the electric pump 100 has an inner cavity 14, the inner cavity 14 includes an impeller cavity 142, the electric pump 100 includes a rotating assembly 15, the rotating assembly 15 includes an impeller assembly 152, the impeller assembly 152 is located in the impeller cavity 142, and one end of the inflow channel 23 communicates with the impeller cavity 142. In this way, the working medium flowing in the inner cavity of the electric pump 100 can be borrowed to enter the inflow channel 23, which is beneficial to simplifying the structure of the electric pump 100 while dissipating heat from the stator assembly 12.

[0065] Furthermore, as an implementation method, please refer to Figures 1 to 22 As shown, the electric pump 100 includes a conductive part 27, the conductive part 27 includes a connector 272, the connector 272 is used for electrical connection with an external power supply, and the support part 261 is formed by insert molding at least with the connector 272 as an insert. In this way, it is beneficial to the miniaturization of the electric pump 100 in the axial direction.

[0066] As an implementation method, please refer to Figures 1 to 13 As shown, the electric pump 100 includes a bottom case 26, the bottom case 26 includes a support part 261, the support part 261 includes a first sub - part 2611 and a second sub - part 2612, and the first sub - part 2611 and the second sub - part 2612 are an integral structural member. The second sub - part 2612 is a partition part 13, the first sub - part 2611 is fixedly connected to the stator assembly 12 and the second housing 1212, and the partition part 13 is hermetically and fixedly connected to the stator assembly 12. Specifically, the second sub - part 2612 is fixedly connected to the second housing 1212 by welding, and the welding methods include but are not limited to infrared welding, rotary friction welding, laser welding, and ultrasonic welding. In this embodiment, the electric pump 100 includes an end cover 21, the end cover 21 is fixedly connected to the bottom case 26, specifically, the end cover 21 is fixedly connected to the bottom case 26 by welding, and the welding methods include but are not limited to infrared welding, rotary friction welding, laser welding, and ultrasonic welding. The electric pump 100 includes a control cavity, the wall part corresponding to the control cavity includes the end cover and the bottom case, and the control board assembly 12 is located in the control cavity 28. In this way, the control cavity 28 and the stator cavity 24 are not connected, so it is beneficial to reduce the heat generated by the stator winding 122 from being transferred to the control board assembly 22 in the control cavity 28, and it is beneficial to improve the service life of the control board assembly 22.

[0067] As another implementation method, please refer to Figure 1 、 Figure 14 、 Figure 15As shown, the electric pump 100 includes a bottom case 26. The bottom case 26 includes a first sub - part 2611'. The first sub - part 2611' and the stator assembly 12 are an integral structural member. That is to say, the second housing 1212 and the first sub - part 2611' are an integral structural member, and the partition 13 and the first sub - part 2611' are a split structural member. The partition 13 is hermetically and fixedly connected to the stator assembly 12. Specifically, the partition 13 is fixedly welded to the stator assembly 12. The welding methods include but are not limited to infrared welding, rotary friction welding, laser welding, and ultrasonic welding. Of course, the hermetic and fixed connection method between the partition 13 and the stator assembly 12 can also include other methods. For example, it can be a combined method of a fixing member and a sealing member. The fixing member includes but is not limited to bolts, and the sealing member includes but is not limited to sealing rings. It should be noted that the hermetic and fixed connection here means that after the partition 13 is connected to the stator assembly 12, the working medium in the communication cavity is sealed in the communication cavity and will not leak out or flow to the outside of the communication cavity.

[0068] To further accelerate the heat dissipation of the stator assembly 12, please refer to Figure 1 、 Figure 2 and Figure 16 As shown, as an implementation method, the inner cavity 14 includes a rotor cavity 141. The rotor cavity 141 communicates with the impeller cavity 142. The electric pump 100 has a through - channel 17. Along the axial direction of the electric pump 100, the through - channel 17 penetrates the bottom 1212d. One end of the through - channel 17 communicates with the rotor cavity 141, and the other end of the through - channel 17 communicates with the communication cavity 16. In this way, the flow of the working medium in the inflow channel 23 can be accelerated, the circulation of the working medium in the inflow channel 23 and the communication cavity 16 can be accelerated, and thus it is beneficial to accelerate the heat dissipation speed of the stator winding 122. Define the heat dissipation path here as the first heat dissipation path S1. The flow direction of the working medium in the first heat dissipation path S1 is impeller cavity 142 -> inflow channel 23 -> communication cavity 16 -> through - channel 17 -> rotor cavity 141.

[0069] To further accelerate the heat dissipation of the stator assembly 12, please refer to Figure 1 、 Figure 2 and Figure 17As shown, as an implementation, the electric pump 100 includes a second return channel 20'. The electric pump 100 includes a rotor assembly 151, and the rotor assembly 151 is fixedly connected to the impeller assembly 152. Specifically, the rotor assembly 151 and the impeller assembly 152 are injection-molded and fixed. At least part of the rotor assembly 151 is located in the rotor cavity 141, and at least part of the second return channel 20' is provided in the rotor assembly 151. The electric pump 100 has an inlet 111 for the inflow of the working medium. One end of the second return channel 20' communicates with the rotor cavity 141, and the other end of the second return channel 20' communicates with the inlet 111. In this way, the working medium in the inflow channel 23 and the communication cavity 16 can enter the rotor cavity 141, and the working medium in the rotor cavity 141 can enter the inlet 111 through the second return channel 20'. The heat dissipation path defined here is the second heat dissipation path S2, and the flow direction of the working medium in the second heat dissipation path S2 is the impeller cavity 142 -> inflow channel 23 -> communication cavity 16 -> through-channel 17 -> rotor cavity 141 -> second return channel 20' -> inlet 111. First, due to the greater pressure difference between the impeller cavity 142 and the inlet 111, the flow velocity of the working medium in the second heat dissipation path S2 is faster, which is beneficial to improving the heat dissipation efficiency of the stator assembly 12. Second, it can be seen that in this implementation, there are both the first heat dissipation path S1 and the second heat dissipation path S2. The increase in the heat dissipation path can also improve the heat dissipation efficiency of the stator assembly 12.

[0070] To ensure the output efficiency of the electric pump, the effective flow area of the through-channel is usually not too large. During the operation of the electric pump, there may be impurities in the working medium. To reduce the blockage of the through-channel and affect the heat dissipation of the stator assembly, as another implementation, please refer to Figures 1 to 3 、 Figure 18As shown in the figure, the impeller chamber 142 includes a volute chamber 1421 and a non-volute chamber 1422. When the electric pump 100 operates, the pressure of the working medium in the volute chamber 1421 is greater than that of the working medium in the non-volute chamber 1422. One end of the inlet passage 23 communicates with the volute chamber 1421. The electric pump 100 includes a return passage 20. The return passage 20 extends in the second housing 1212 along the axial direction of the electric pump 100. One end of the return passage 20 communicates with the communication chamber 16, and the other end of the return passage 20 communicates with the non-volute chamber 1422. Define the third heat dissipation path S3. The flow direction of the working medium in the third heat dissipation path S3 is -> the volute chamber of the impeller chamber -> the inlet passage -> the communication chamber -> the return passage -> the non-volute chamber 1422 of the impeller chamber. In this way, first, the through passage 17 can be not provided, reducing the risk of blockage of the through passage 17. Second, in this way, the pressure drop of the working medium flowing in the volute chamber 1421 and the non-volute chamber 1422 is less than the pressure drop between the impeller chamber 142 and the inlet 111. Without affecting the efficiency, the effective flow area of the return passage 20 can be designed to be larger, so it is beneficial to reduce the risk of blockage of the third heat dissipation path S3. It should be noted that when the electric pump operates, under the rotation of the impeller assembly, part of the working medium in the impeller chamber will leave the electric pump through the outlet 112 along the volute chamber 1421.

[0071] To further accelerate the heat dissipation of the stator assembly 12, please refer to Figures 1 to 3 As shown in the figure, as an implementation method, the electric pump 100 includes a second return passage 20'. The electric pump 100 includes a rotor assembly 151. The rotor assembly 151 is fixedly connected to the impeller assembly 152. Specifically, the rotor assembly 151 and the impeller assembly 152 are injection-molded and fixed. At least part of the rotor assembly 151 is located in the rotor chamber 141, and at least part of the second return passage 20' is provided in the rotor assembly 151. The electric pump 100 has an inlet 111 for the inflow of the working medium. One end of the second return passage 20' communicates with the rotor chamber 141, and the other end of the second return passage 20' communicates with the inlet 111. In this way, the working medium in the rotor chamber 141 can enter the inlet 111 through the second return passage 20'. Define the heat dissipation path here as the fourth heat dissipation path S4. The flow direction of the working medium in the fourth heat dissipation path S4 is the impeller chamber 142 -> the rotor chamber 141 -> the second return passage 20' -> the inlet 111; First, due to the greater pressure difference between the impeller chamber 142 and the inlet 111, the flow velocity of the working medium in the fourth heat dissipation path S4 is faster, which is beneficial to improving the heat dissipation efficiency of the stator assembly 12. Second, it can be seen that in this implementation method, both the first heat dissipation path S3 and the fourth heat dissipation path S4 are available, and the increase in the heat dissipation path can also improve the heat dissipation efficiency of the stator assembly 12.

[0072] As an implementation manner, please refer to FIG. Figures 1 to 24 As shown, the electric pump 100 includes a conductive part 19. The stator winding 122 includes a winding 1223. One end of the conductive part 19 is electrically connected to the winding 1223. The bottom 1212d includes a positive bottom surface 1212g and a negative bottom surface 1212h. The positive bottom surface 1212g is closer to the partition 13 relative to the negative bottom surface 1212h. The partition 13 is hermetically fixed to the positive bottom surface 1212g. The positive bottom surface 1212g includes a covering surface 1212m and an open surface 1212n. The part of the positive bottom surface 1212g covered by the partition 13 is defined as the covering surface 1212m, and the part not covered by the partition 13 is defined as the open surface 1212n. Specifically, the partition 13 is hermetically fixed to the covering surface 1212m. Define a first reference plane 101. The first reference plane 101 is perpendicular to the axial direction of the electric pump 100. Project the covering surface 1212m, the open surface 1212n, and the part where the conductive member 271 is connected to the winding 1223 onto the first reference plane 101. The part where the conductive member 271 is connected to the winding 1223 is located within the projection area of the open surface 1212n. In this way, the conductive part can be located in the dry area outside the communication cavity, the structure for protecting the conductive part can be reduced, and it is beneficial to simplify the structural design of the electric pump. For the convenience of representation, in Figure 21 the projection areas of the covering surface 1212m and the open surface 1212n will be represented by different cross-hatching.

[0073] It should be noted that the above embodiments are only used to illustrate the present application and do not limit the technical solutions described in the present application. Although this specification has described the present application in detail with reference to the above embodiments, those of ordinary skill in the art should understand that those skilled in the technical field can still modify the present application or make equivalent replacements. All technical solutions and their improvements that do not depart from the spirit and scope of the present application shall be covered by the scope of the claims of the present application.

Claims

1. An electric pump (100), characterized in that: The electric pump (100) includes a control board assembly (22) and a stator assembly (12). The stator assembly (12) includes a stator winding (122) and a stator housing (121). The stator housing (121) is formed by insert molding with at least the stator winding (122) as an insert. The stator housing (121) includes a bottom (1212d). The electric pump (100) includes a partition (13). Along the axial direction of the electric pump (100), the partition (13) is farther from the stator winding (122) than the bottom (1212d). The bottom (1212d) and the partition (13) are hermetically arranged. The bottom (1212d) includes a positive bottom surface (1212g) and a negative bottom surface (1212h). Along the axial direction of the electric pump (100), the positive bottom surface (1212g) is farther from the stator winding (122) than the negative bottom surface (1212h). The partition (13) includes a contact wall (131) and a connecting wall (132). Along the axial direction of the electric pump (100), the contact wall (131) is closer to the positive bottom surface (1212g) than the connecting wall (132). The electric pump (100) has a communication cavity (16) that can flow or store a working medium. The wall portion corresponding to the communication cavity (16) includes a part of the positive bottom surface (1212g) and a part of the contact wall (131). The control board assembly (22) is in direct contact with the connecting wall (132) or a heat-conducting portion (19) is filled between the connecting wall (132) and the control board assembly (22).

2. The electric pump (100) according to claim 1, characterized in that: The wall portion corresponding to the communication cavity (16) includes a peripheral side portion (161). A first reference plane (101) is defined. The first reference plane (101) is a plane parallel to the plane where the positive bottom surface (1212g) of the bottom (1212d) is located. The peripheral side portion (161) includes a first peripheral side portion (1611) and a second peripheral side portion (1612). The first peripheral side portion (1611) and the second peripheral side portion (1612) are arranged opposite to each other. Project the first peripheral side portion (1611), the second peripheral side portion (1612), and the stator winding (122) onto the first reference plane (101). Along the radial direction of the electric pump (100), the projection contour line (L1) of the first peripheral side portion (1611) and the projection contour line (L2) of the second peripheral side portion (1612) are located radially outside the projection contour line (L5) of the outer side portion of the stator winding (122).

3. The electric pump (100) according to claim 2, characterized in that: The peripheral portion (161) includes a third peripheral portion (1613) and a fourth peripheral portion (1614). The third peripheral portion (1613) and the fourth peripheral portion (1614) are oppositely arranged. The first peripheral portion (1611) and the second peripheral portion (1612) are connected through the third peripheral portion (1613) and the fourth peripheral portion (1614). The third peripheral portion (1613), the fourth peripheral portion (1614), and the stator winding (122) are orthogonally projected onto the first reference plane (101). Along the radial direction of the electric pump (100), the projection contour lines (L3) of a part of the third peripheral portion (1613) and the projection contour lines (L4) of a part of the fourth peripheral portion (1614) are located radially inside the projection contour line (L5) of the outer side of the stator winding (122).

4. The electric pump (100) according to any one of claims 1 to 3, characterized in that: The stator housing (121) includes a first housing (1211) and a second housing (1212). The first housing (1211) is injection molded with at least the stator winding (122) as an insert, defining a first assembly (25). The first assembly (25) includes the stator winding (122) and the first housing (1211). The second housing (1212) is injection molded with at least the first assembly (25). The second housing (1212) includes a bottom (1212d) and a cylindrical portion (1212a). Along the axial direction of the electric pump (100), the bottom (1212d) is located on one side of the cylindrical portion (1212a). The electric pump (100) has a rotor cavity (141). The wall portion corresponding to the rotor cavity (141) includes the cylindrical portion (1212a) and the inverted bottom surface (1212h) of a part of the bottom (1212d). The part of the inverted bottom surface (1212h) that defines the wall portion forming the rotor cavity (141) is defined as the bottom surface (1411). Along the radial direction of the electric pump, the area of the communication cavity (16) is larger than the area of the bottom surface (1411).

5. The electric pump (100) according to claim 4, characterized in that: The electric pump (100) includes an inlet channel (23). The wall forming the inlet channel (23) is at least partially located in the second housing (1212). At least a part of the inlet channel (23) is along the axial direction of the electric pump (100). Along the radial direction of the electric pump (100), the inlet channel (23) is located radially outside the first assembly (25). The inlet channel (23) can allow the working medium to flow through. One end of the inlet channel (23) communicates with the communication cavity (16). The electric pump (100) includes an impeller cavity (142). The other end of the inlet channel (23) communicates with the impeller cavity (142).

6. The electric pump (100) according to claim 5, characterized in that: The rotor cavity (141) communicates with the impeller cavity (142). The electric pump (100) has a through-channel (17) which, along the axial direction of the electric pump (100), penetrates through the bottom (1212g). One end of the through-channel (17) communicates with the rotor cavity (141), and the other end of the through-channel (17) communicates with the communication cavity (16).

7. The electric pump (100) according to claim 5, characterized in that: The impeller cavity (142) includes a volute cavity (1421) and a non-volute cavity (1422). When the electric pump (100) operates, the pressure of the working medium in the volute cavity (1421) is greater than the pressure of the working medium in the non-volute cavity (1422). One end of the inlet channel (23) communicates with the volute cavity (1421). The electric pump (100) includes a first reflux channel (20) which extends in the second housing (1212) along the axial direction of the electric pump (100). One end of the first reflux channel (20) communicates with the communication cavity (16), and the other end of the first reflux channel (20) communicates with the non-volute cavity (1422).

8. The electric pump (100) according to claim 6 or 7, characterized in that: The electric pump (100) includes a second reflux channel (20'). The electric pump (100) includes a rotor assembly (151) which is fixedly connected to the impeller assembly (152). At least part of the rotor assembly (151) is located in the rotor cavity (141), and at least part of the second reflux channel (20') is arranged in the rotor assembly (151). The electric pump (100) has an inlet (111). One end of the second reflux channel (20') communicates with the rotor cavity (141), and the other end of the second reflux channel (20') communicates with the inlet (111).

9. The electric pump (100) according to any one of claims 1 to 8, characterized in that: The control board assembly (22) includes a substrate (221) and electronic components (222). The substrate (221) includes a front side (2211) and a back side (2212). Along the axial direction of the electric pump (100), the front side (2211) is closer to the partition portion (13) than the back side (2212). The electronic components (222) are arranged on the back side (2212). At least the front side (2211) is in direct contact with the partition portion (13), or a heat-conducting portion (19) is filled between at least part of the front side (2211) and the partition portion (13). Or a gap is formed between the front side (2211) and the partition portion (13), at least part of the electronic components (222) are arranged between the front side (2211) and the partition portion (13), and a heat-conducting portion (19) is filled between the front side (2211) and the partition portion (13).

10. The electric pump (100) according to any one of claims 1 to 9, characterized in that: The electric pump (100) includes a conductive member (271), the stator winding (122) includes a winding (1223), one end of the conductive member (271) is electrically connected to the winding (1223), the bottom (1212d) includes a positive bottom surface (1212g) and a negative bottom surface (1212h), along the axial direction of the electric pump, the positive bottom surface (1212g) is closer to the partition portion (13) than the negative bottom surface (1212h), the positive bottom surface (1212g) includes a covering surface (1212m) and an open surface (1212n), a portion of the positive bottom surface (1212g) covered by the partition portion (13) is defined as the covering surface (1212m), and a portion not covered by the partition portion (13) is defined as the open surface (1212n), the partition portion (13) is hermetically fixed to the covering surface (1212m), a first reference plane (101) is defined, the first reference plane (101) is perpendicular to the axial direction of the electric pump (100), and the covering surface (1212m), the open surface (1212n), and the portion where the conductive member (271) is connected to the winding (1223) are orthogonally projected onto the first reference plane (101), and the portion where the conductive member (271) is connected to the winding (1223) is located within the projected area of the open surface (1212n).

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