Electric motorcycle

Abstract

The invention discloses an electric motorcycle. The electric motorcycle comprises a motorcycle frame, a motorcycle body covering part, a walking assembly, a power assembly and a power battery. The frame comprises a main frame, a containing space is formed in the main frame, and at least part of the power battery is arranged in the containing space; the main frame comprises a protruding abutting portion arranged in the containing space, the electric motorcycle further comprises a first installation piece and a second installation piece, the first installation piece is arranged in the containing space or arranged at one end of the containing space, and the second installation piece is arranged in the containing space and abuts against the abutting portion. The first mounting piece, the second mounting piece and part of the main frame form a cooling liquid containing part, and the cooling liquid containing part is filled with cooling liquid. Through the arrangement, the cooling liquid can dissipate heat of the power battery in the accommodating space, so that the power battery can be at a proper working temperature, and the working stability of the power battery is improved.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to an electric motorcycle. Background Art

[0002] During long periods of driving, the battery of an electric motorcycle is prone to overheating due to continuous discharge. In the existing technology, the power battery needs to be fixed to the frame first, and a heat dissipation device is set on this basis to dissipate heat. Within the limited layout control space, electric motorcycles are usually only provided with heat sinks on the bottom cover of the battery to dissipate heat from the battery. However, during long periods of driving, the heat dissipation efficiency of the bottom heat sink is poor, so that the heat in the battery cannot be dissipated in time, causing heat accumulation, making the temperature of the electric motorcycle battery high, which is not conducive to battery discharge, and in the long run will shorten the battery life. Summary of the Invention

[0003] In order to address the deficiencies of the prior art, the purpose of this application is to provide an electric motorcycle with a better heat dissipation effect of its power battery.

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

[0005] An electric motorcycle includes a frame, a body covering, a running assembly, a power assembly and a power battery; the frame includes a main frame, the main frame is formed with a accommodating space, and the power battery is at least partially arranged in the accommodating space; the main frame includes a protruding abutting portion arranged in the accommodating space, and the electric motorcycle also includes a first mounting member and a second mounting member, the first mounting member is arranged inside the accommodating space or at one end of the accommodating space, the second mounting member is arranged in the accommodating space and abuts against the abutting portion, the first mounting member, the second mounting member and part of the main frame form a coolant accommodating portion, and the coolant accommodating portion is filled with coolant.

[0006] Furthermore, the abutting portion includes a first abutting portion and a second abutting portion, the first mounting member abuts against the first abutting portion, the second mounting member abuts against the second abutting portion, and the first mounting member, the second mounting member and a portion of the main frame form a coolant receiving portion.

[0007] Furthermore, along the width direction of the electric motorcycle, the accommodating space is divided into a first accommodating space and a second accommodating space, and the coolant accommodating portion is located between the first accommodating space and the second accommodating space.

[0008] Furthermore, a longitudinal plane perpendicular to the width direction of the electric motorcycle and passing through the width center of the electric motorcycle is defined, the first abutment portion and the second abutment portion are basically symmetrical about the longitudinal plane, and the distance between the first abutment portion and the second abutment portion at all locations along the width direction of the electric motorcycle is basically the same.

[0009] Furthermore, the first mounting member and the second mounting member are configured as a box body, the bottom of the first mounting member abuts against the first abutting portion, the bottom of the second mounting member abuts against the second abutting portion, and the bottom of the first mounting member and the bottom of the second mounting member form a coolant receiving portion with part of the main frame.

[0010] Furthermore, the power battery is at least partially disposed in the box body, and the electric motorcycle includes a battery cover, which is detachably connected to the box body.

[0011] Furthermore, the first mounting member and the second mounting member are configured as mounting plates, the first accommodating space includes a first opening portion, the second accommodating space includes a second opening portion, the electric motorcycle includes a battery cover, the battery cover is arranged on the first opening portion and the second opening portion and is fixedly connected to the frame, and the power battery is arranged between the first mounting member and the battery cover, or the power battery is arranged between the second mounting member and the battery cover.

[0012] Furthermore, a water inlet and a water outlet are provided on the main frame. The water inlet is provided below the main frame, and the water outlet is provided above the main frame. Both the water inlet and the water outlet are communicated with the coolant containing portion.

[0013] Furthermore, the electric motorcycle also includes a battery control module and a charging device. The battery control module is located above the main frame and fixedly connected to the main frame. The charging device is located above the battery control module and fixedly connected to the battery control module.

[0014] Furthermore, the frame also includes a front bracket located in front of the main frame, which is fixedly connected to the main frame. The electric motorcycle also includes a steering handle, which is rotatably connected to the front bracket; the main frame also includes a support portion located behind the accommodating space, the support portion includes a first bracket and a second bracket extending backward along the length direction of the electric motorcycle, the first bracket and the second bracket are distributed along the width direction of the electric motorcycle, the power assembly is located below the support portion, and the power assembly is also at least partially arranged between the first bracket and the second bracket.

[0015] The electric motorcycle is provided with a coolant container in the accommodating space and coolant is added to the coolant container, so that the coolant can dissipate heat for the power battery located in the accommodating space, thereby keeping the power battery at a suitable operating temperature and improving the operating stability of the power battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A perspective view of an electric motorcycle provided in an embodiment of the present application;

[0017] Figure 2 A cross-sectional view of a frame provided in an embodiment of the present application;

[0018] Figure 3A cross-sectional view of an embodiment of a vehicle frame provided in an embodiment of the present application;

[0019] Figure 4 A cross-sectional view from another angle of an embodiment of a vehicle frame provided in an embodiment of the present application;

[0020] Figure 5 A cross-sectional view of another embodiment of a vehicle frame provided in an embodiment of the present application;

[0021] Figure 6 A schematic diagram of the frame structure provided in an embodiment of the present application;

[0022] Figure 7 A schematic diagram of the structure of the vehicle frame, power assembly, power battery and battery control module provided in an embodiment of the present application. DETAILED DESCRIPTION

[0023] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the specific implementation of the present application will be clearly and completely described below in conjunction with the drawings in the implementation of the present application.

[0024] like Figure 1 As shown, an electric motorcycle 100 includes a frame 11, a body covering 12, a running assembly 13, a power assembly 14 and a power battery 15. The frame 11 constitutes the basic framework of the electric motorcycle 100, and the frame 11 is used to carry other components of the electric motorcycle 100. The body covering 12 is at least partially arranged on the frame 11, and the body covering 12 is used to protect the internal parts of the electric motorcycle 100. The running assembly 13 is at least partially arranged under the frame 11, and the running assembly 13 is used for the movement of the electric motorcycle 100. The power assembly 14 is at least partially arranged on the frame 11, and the power assembly 14 provides power for the electric motorcycle 100. The power assembly 14 is transmission-connected to the running assembly 13, thereby driving the running assembly 13 to move. The power battery 15 is at least partially arranged on the frame 11 and fixedly connected to the frame 11, and the power battery 15 is used to provide energy for the power assembly 14. In order to clearly illustrate the technical solution of the present application, the following are also defined. Figure 1 The front, rear, left, right, top and bottom sides are shown. It is understood that the length direction in the embodiment of the present application refers to the front-to-back direction of the electric motorcycle 100, the width direction refers to the left-right direction of the electric motorcycle 100, and the height direction refers to the up-down direction of the electric motorcycle 100.

[0025] like Figure 2As shown, the frame 11 includes a main frame 111, at least a portion of which encloses a basic framework for accommodating the power assembly 14 and the power battery 15. At least a portion of the main frame 111 forms an accommodating space 1111 that substantially extends along the width of the electric motorcycle 100. A support portion 112 is further provided behind the support accommodating space 1111. The accommodating space 1111 can be used to accommodate the power battery 15, thereby enabling the main frame 111 to provide support for the power battery 15. The power assembly 14 can be disposed below the support portion 112. In the prior art, the power battery 15 is typically provided with mounting points to connect the power battery 15 to the main frame 111, or a portion of the frame 11 is connected in front of and behind the power battery 15, making the power battery 15 a part of the frame 11. Both of these methods allow the power battery 15 to assume some of the functions of the frame 11. In order to enable the power battery 15 to bear stress, the thickness of the power battery 15 needs to be increased, resulting in poor heat dissipation of the power battery 15. During the operation of the electric motorcycle 100, the power battery 15 is at a relatively high operating temperature, which affects the service life and operating stability of the power battery 15. In the present application, the power battery 15 is arranged in the accommodating space 1111, so that the power battery 15 does not need to bear stress, thereby eliminating the need for mounting points on the power battery 15, thereby reducing the thickness of the power battery 15 and improving the heat dissipation of the power battery 15. Furthermore, in the prior art, the power battery 15 is typically provided with a heat dissipation surface only on its bottom surface, resulting in poor heat dissipation efficiency. This causes heat generated by the power battery 15 during operation to accumulate within the power battery 15, thereby causing the power battery 15 to overheat, which is detrimental to its operation. In this embodiment, the main frame 111 further includes an abutment portion 1112 at least partially disposed within the accommodating space 1111. Specifically, the abutment portion 1112 is configured as a protrusion extending into the accommodating space 1111. The electric motorcycle 100 further includes a mounting member 1113, which is at least partially disposed within the accommodating space 1111 and abuts against the abutment portion 1112, thereby positioning the mounting member 1113 within the accommodating space.

[0026] As an optional embodiment, the abutment portion 1112 is arranged in the accommodating space 1111, and the mounting member 1113 includes a first mounting member 1113a and a second mounting member 1113b. The first mounting member 1113a is arranged on one side of the main frame 111 along the width direction of the electric motorcycle 100 and is fixedly connected to the main frame 111, so that one end of the accommodating space 1111 is relatively closed, and the second mounting member 1113b, the first mounting member 1113a and the inner wall of part of the accommodating space 1114 are surrounded to form a coolant accommodating portion 1114, so that the main frame 111 is formed with the accommodating space 1111 and the coolant accommodating portion 1114 distributed along the width direction of the electric motorcycle 100. The coolant accommodating portion 1114 is located on one side of the accommodating space 1111, the power battery 15 is arranged in the accommodating space 1111, the coolant accommodating portion 1114 is filled with coolant, and the second mounting member 1113b constitutes the cooling surface of the coolant accommodating portion 1114. Through the above arrangement, the coolant holding portion 1114 is arranged in the holding space 1111, and the coolant in the coolant holding portion 1114 can exchange heat with the heat generated by the power battery 15 through the cooling surface formed by the second mounting member 1113b, thereby improving the heat dissipation effect of the power battery 15, making the power battery 15 at a suitable operating temperature, and further improving the service life and working stability of the power battery 15.

[0027] As another optional embodiment, the abutting portion 1112 includes a first abutting portion 1112a and a second abutting portion 1112b, both of which are arranged in the accommodating space 1111, and the first abutting portion 1112a abuts against the first mounting member 1113a, and the second abutting portion 1112b abuts against the second mounting member 1113b, so that the first mounting member 1113a, the second mounting member 1113b and the inner wall of at least part of the accommodating space 1114 are surrounded to form a coolant accommodating portion 1114, so that the coolant accommodating portion 1114 is formed. The coolant receiving portion 1114 is located within the receiving space 1111, and the coolant receiving portion 1114 divides the receiving space 1111 into a first receiving space 1111a and a second receiving space 1111b distributed along the width direction of the electric motorcycle 100. In this case, the coolant receiving portion 1114 is located between the first receiving space 1111a and the second receiving space 1111b, and the power battery 15 is located within the first receiving space 1111a and / or the second receiving space 1111b. The first mounting member 1113a and the second mounting member 1113b constitute the cooling surface of the coolant receiving portion 1114. Through the above arrangement, the cooling surfaces provided on both sides can improve the heat exchange efficiency of the coolant in the coolant receiving portion 1114, thereby reducing the operating temperature of the power battery 15 and improving the operating stability of the power battery 15. Furthermore, the arrangement of the power batteries 15 in the first accommodation space 1111a and the second accommodation space 1111b allows the two groups of power batteries 15 to be connected in parallel. Thus, if a power battery 15 on one side fails, the power battery 15 on the other side can continue to operate, thereby improving the reliability of the power batteries 15. Furthermore, two groups of power batteries 15 offer greater versatility than a single-piece power battery 15.

[0028] like Figure 3As shown, further, a longitudinal plane 101 is defined that is perpendicular to the width direction of the electric motorcycle 100 and passes through the width center of the electric motorcycle 100, and the first abutting portion 1112a and the second abutting portion 1112b are symmetrical about the longitudinal plane 101. Through the above arrangement, the first accommodating space 1111a, the coolant accommodating portion 1114, and the second accommodating space 1111b are basically distributed along the width direction of the electric motorcycle 100, so that the cooling surface of the coolant accommodating portion 1114 can be arranged perpendicular to the width direction of the electric motorcycle 100. Through the above arrangement, when the cooling surface is arranged perpendicular to the width direction of the electric motorcycle 100, the cooling surface of the coolant accommodating portion 1114 is at its maximum state. At this time, the heat transfer efficiency between the coolant in the coolant accommodating portion 1114 and the power battery 15 is the highest, and the heat dissipation effect of the power battery 15 is the best. In addition, the first abutment portion 1112a and the second abutment portion 1112b are symmetrical about the longitudinal plane 101, and the sizes of the first accommodating space 1111a and the second accommodating space 1111b on both sides are basically the same, so that after the power battery 15 is arranged in the first accommodating space 1111a and the second accommodating space 1111b, along the width direction of the electric motorcycle 100, the center of gravity of the entire electric motorcycle 100 is basically located in the middle position of the electric motorcycle 100, thereby improving the maneuverability of the electric motorcycle 100 and making it easier for the driver to control the electric motorcycle 100.

[0029] More specifically, the distance between the first abutting portion 1112a and the second abutting portion 1112b is substantially uniform along the extension direction of the abutting portion 1112. This arrangement allows the abutting portion 1112 to have substantially uniform thickness at different locations, thereby evenly distributing the coolant within the coolant container 1114. This in turn ensures that the heat exchange efficiency between the coolant at different locations within the coolant container 1114 and the power battery 15 is substantially consistent, thereby avoiding uneven temperature distribution across various portions of the power battery 15 and improving the operational stability of the power battery 15.

[0030] like Figure 3 and Figure 4As shown, as an optional implementation, the first mounting member 1113a and the second mounting member 1113b can be configured as a box body 1113c. The bottom of the first mounting member 1113a abuts the first abutting portion 1112a, and the bottom of the second mounting member 1113b abuts the second abutting portion 1112b. The bottoms of the first mounting member 1113a and the second mounting member 1113b, together with a portion of the accommodation space 1111, form a coolant receiving portion 1114. The electric motorcycle 100 includes a battery cover 16. The battery cover 16 is detachably connected to the box body 1113c. After opening the battery cover 16, the power battery 15 can be placed in the box body 1113c. The box body 1113c is located within the first accommodation space 1111a and the second accommodation space 1111b and abuts the abutting portion 1112. The box body 1113c and the abutting portion 1112 surround the coolant receiving portion 1114. Specifically, a sealing groove is provided on the abutment portion 1112, and a mounting hole is also provided on the outer edge of the box body 1113c. After the fastener passes through the mounting hole, it is fixedly connected to the abutment portion 1112. A sealing ring is provided on the sealing groove, and the sealing ring can achieve sealing of the coolant holding portion 1114. Optionally, the box body 1113c can also be fixedly connected to the abutment portion 1112 by welding. Through the above arrangement, the shell of the box body 1113c is in direct contact with the coolant for heat exchange, thereby avoiding the need to set other heat-conducting components between the coolant and the box body 1113c, thereby improving the heat exchange efficiency between the coolant and the power battery 15, and thereby improving the heat dissipation effect of the power battery 15. In addition, the power battery 15 is arranged in the box body 1113c to prevent the coolant from leaking and entering the power battery 15 to cause a short circuit, thereby damaging the power battery 15 or endangering the life of the driver.

[0031] like Figure 5 and Figure 6As shown, as another optional implementation, the first mounting member 1113a and the second mounting member 1113b can be configured as mounting plates 1113d. The mounting plates 1113d are arranged on both sides of the abutment portion 1112 along the width direction of the electric motorcycle 100 and abut against the first abutment portion 1112a and the second abutment portion 1112b respectively. The mounting plates 1113d and the abutment portion 1112 are surrounded by a coolant receiving portion 1114. Specifically, the mounting plates 1113d and the abutment portion 1112 are fixedly connected by gluing or welding. Compared with fastener connection, welding and gluing are easier to install and have better sealing properties, making coolant less likely to leak. In this embodiment, the first accommodating space 1111a includes a first opening 1111c, and the second accommodating space 1111b includes a second opening 1111d. The first opening 1111c and the second opening 1111d are both in communication with the outside world. The first opening 1111c and the second opening 1111d are used to accommodate the power battery 15 within the first accommodating space 1111a and the second accommodating space 1111b. The battery cover 16 is disposed above the first opening 1111c and the second opening 1111d and is fixedly connected to the vehicle frame 11. The power battery 15 is disposed between the mounting plate 1113d and the battery cover 16. Due to the above arrangement, the mounting plate 1113d can be made of a different material than other components, such as the battery cover 16, allowing the mounting plate 1113d to be made of a material with higher thermal conductivity. For example, in the present application, the mounting plate 1113d can be made of an aluminum plate to improve thermal conductivity and thereby enhance heat dissipation of the power battery 15. In addition, the mounting plate 1113 d and the battery cover 16 use less material, which makes the electric motorcycle 100 lighter and enables the electric motorcycle 100 to be lightweight.

[0032] Optionally, the coolant containing portion 1114 can also be integrally formed with the main frame 111, that is, the coolant containing portion 1114 is pre-set during the processing of the main frame 111. This setting method does not require the installation part 1113 to be set during the later installation process, thereby optimizing the assembly process of the electric motorcycle 100 and improving the assembly efficiency of the electric motorcycle 100. In addition, the integral molding of the coolant containing portion 1114 and the main frame 111 can also improve the sealing of the coolant containing portion 1114 and prevent the coolant from leaking from the coolant containing portion 1114.

[0033] like Figure 6As shown, the main frame 111 is further provided with a water inlet 1115 and a water outlet 1116. The water inlet 1115 is provided below the main frame 111, and the water outlet 1116 is provided above the main frame 111. Both the water inlet 1115 and the water outlet 1116 are in communication with the coolant container 1114. Specifically, the water inlet 1115 allows coolant to flow in, and the water outlet 1116 allows coolant to flow out. Both the water inlet 1115 and the water outlet 1116 are in communication with the water pump of the electric motorcycle 100. With the above arrangement, the water inlet 1115 is provided below the main frame 111, which is closer to the water pump, thereby reducing the number of piping connections, and is also conducive to exhausting air from the coolant, preventing air from entering the water pump and reducing its operating efficiency.

[0034] like Figure 7 As shown, the frame 11 further includes a front bracket 113 located in front of the main frame 111, and the front bracket 113 is fixedly connected to the main frame 111. The electric motorcycle 100 also includes a steering handle 17 (refer to Figure 1 ), the steering handle 17 is rotatably connected to the front bracket 113. Furthermore, the support portion 112 includes a first bracket 1121 and a second bracket 1122 extending backward along the length direction of the electric motorcycle 100, and the first bracket 1121 and the second bracket 1122 are distributed along the width direction of the electric motorcycle 100. The power assembly 14 is located behind the main frame 111, and the power assembly 14 is also at least partially arranged between the first bracket 1121 and the second bracket 1122. Among them, the first bracket 1121 and the second bracket 1122 are both fixedly connected to the main frame 111 by welding. Through the above arrangement, for the electric motorcycle 100, the power assembly 14 refers to the drive motor, which provides driving force for the electric motorcycle 100. The power assembly 14 is arranged close to the power battery 15, so that the length of the wiring harness in the power battery 15 and the power assembly 14 can be reduced, thereby facilitating the arrangement of the wiring harness. In addition, the first bracket 1121 and the second bracket 1122 can also provide protection for the power assembly 14 to prevent the power assembly 14 from being damaged.

[0035] Furthermore, the electric motorcycle 100 also includes a battery control module 18, which is located above and fixedly connected to the main frame 111. Compared to a gasoline-powered motorcycle 100 that requires a fuel tank, the electric motorcycle 100 has more space for the fuel tank. Therefore, placing the battery control module 18 above the main frame 111 not only effectively utilizes the space available on the electric motorcycle 100, but also allows the battery control module 18 to be positioned close to the power battery 15 and the steering handlebar 17, thereby reducing the wiring length between the power battery 15 and the battery control module 18, and between the battery control module 18 and the steering handlebar 17. The electric motorcycle 100 also includes a charging device 19, which is located above and fixedly connected to the battery control module 18. This effectively utilizes the space available on the electric motorcycle 100 and allows it to be positioned close to the battery control module 18, thereby reducing the wiring length between the charging device 19 and the battery control module 18.

[0036] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all such improvements and changes should fall within the scope of protection of the claims appended to this application.

Claims

1. An electric motorcycle comprising: Frame; a body panel, the body panel being at least partially disposed on the vehicle frame; a traveling assembly, wherein the traveling assembly is at least partially disposed below the vehicle frame; A power assembly, the power assembly being at least partially disposed on the vehicle frame and being transmission-connected to the travel assembly; a power battery, wherein the power battery is at least partially disposed on the vehicle frame and fixedly connected to the vehicle frame; It is characterized by: The frame includes a main frame, which is formed with a accommodating space, and the power battery is at least partially arranged in the accommodating space; the main frame includes a protruding abutting portion arranged in the accommodating space, and the electric motorcycle also includes a first mounting member and a second mounting member, the first mounting member is arranged inside the accommodating space or at one end of the accommodating space, and the second mounting member is arranged in the accommodating space and abuts against the abutting portion, the first mounting member, the second mounting member and part of the main frame form a coolant accommodating portion, and the coolant accommodating portion is filled with coolant.

2. The electric motorcycle according to claim 1, characterized in that: The abutting portion includes a first abutting portion and a second abutting portion. The first mounting member abuts against the first abutting portion, and the second mounting member abuts against the second abutting portion. The first mounting member, the second mounting member, and a portion of the main frame form a coolant receiving portion.

3. The electric motorcycle according to claim 2, characterized in that: The accommodating space is divided into a first accommodating space and a second accommodating space along a width direction of the electric motorcycle, and the coolant accommodating portion is located between the first accommodating space and the second accommodating space.

4. The electric motorcycle according to claim 3, characterized in that: A longitudinal plane perpendicular to the width direction of the electric motorcycle and passing through the width center of the electric motorcycle is defined, wherein the first abutting portion and the second abutting portion are substantially symmetrical about the longitudinal plane, and along the width direction of the electric motorcycle, the distance between the first abutting portion and the second abutting portion is substantially consistent at all locations.

5. The electric motorcycle according to claim 3, characterized in that: The first mounting member and the second mounting member are configured as a box body, the bottom of the first mounting member abuts against the first abutting portion, the bottom of the second mounting member abuts against the second abutting portion, and the bottom of the first mounting member and the bottom of the second mounting member form a coolant receiving portion with part of the main frame.

6. The electric motorcycle according to claim 5, characterized in that: The power battery is at least partially disposed in the box body, and the electric motorcycle includes a battery cover, which is detachably connected to the box body.

7. The electric motorcycle according to claim 3, characterized in that: The first mounting member and the second mounting member are configured as mounting plates, the first accommodating space includes a first opening portion, the second accommodating space includes a second opening portion, the electric motorcycle includes a battery cover, the battery cover is disposed on the first opening portion and the second opening portion and is fixedly connected to the frame, the power battery is disposed between the first mounting member and the battery cover, or the power battery is disposed between the second mounting member and the battery cover.

8. The electric motorcycle according to claim 1, characterized in that: The main frame is also provided with a water inlet and a water outlet, the water inlet is provided below the main frame, and the water outlet is provided above the main frame, and both the water inlet and the water outlet are communicated with the coolant containing portion.

9. The electric motorcycle according to claim 1, characterized in that: The electric motorcycle further includes a battery control module and a charging device. The battery control module is located above the main frame and fixedly connected to the main frame. The charging device is located above the battery control module and fixedly connected to the battery control module.

10. The electric motorcycle according to claim 1, characterized in that: The frame also includes a front bracket located in front of the main frame, and the front bracket is fixedly connected to the main frame. The electric motorcycle also includes a steering handle, and the steering handle is rotatably connected to the front bracket; the main frame also includes a support portion located behind the accommodating space, and the support portion includes a first bracket and a second bracket extending backward along the length direction of the electric motorcycle, and the first bracket and the second bracket are distributed along the width direction of the electric motorcycle. The power assembly is located below the support portion, and the power assembly is also at least partially arranged between the first bracket and the second bracket.

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