Vehicle-mounted charging device and electric tricycle

Abstract

The utility model discloses a vehicle-mounted charging device and an electric tricycle. The vehicle-mounted charging device comprises a shell, a power conversion circuit board and a cooling fan, the shell is provided with a top wall, the top wall comprises an inner surface and an outer surface, a plurality of cooling fins are arranged on the outer surface, a hollow area is defined by the cooling fins in the middle of the outer surface, a cooling channel is formed by every two adjacent cooling fins, and an air inlet is formed in the end, away from the hollow area, of each cooling channel. An air outlet of the heat dissipation channel is formed above the hollow area and faces the direction of the hollow area; the power conversion circuit board is arranged in the shell, the power conversion circuit board comprises a direct current conversion module, the position of the direct current conversion module corresponds to the position of the hollow area, and the direct current conversion module is in contact with the inner surface; the cooling fan is arranged in the hollow area and electrically connected with the power conversion circuit board. According to the technical scheme, the technical problem that the heat dissipation effect of the vehicle-mounted charging device in the related technology is poor can be solved.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of electric tricycles, and in particular to a vehicle-mounted charging device and an electric tricycle. Background Art

[0002] The on-board charging device is an important component of the electric tricycle, and its function is to provide the electric energy transmitted by the power supply to the load of the electric tricycle. In the related art, the on-board charging device includes a shell and a power conversion circuit board arranged in the shell. The power conversion circuit board will generate a lot of heat when it is in working state. Since the power conversion circuit board is in contact with the shell, and the outer wall of the shell is provided with fins, the heat emitted by the power conversion circuit board is transferred to the fins through the shell, and the fins complete the heat dissipation under the action of the outside air. However, this heat dissipation path is unevenly distributed due to the uneven distribution of the heat-generating electrical components of the power conversion circuit board, resulting in poor heat dissipation effect of the on-board charging device. Utility Model Content

[0003] The purpose of the present application is to provide a vehicle-mounted charging device and an electric tricycle, aiming to improve the technical problem of poor heat dissipation effect of the vehicle-mounted charging device in the related art.

[0004] According to a first aspect of the present application, there is provided a vehicle-mounted charging device, comprising:

[0005] The housing has a top wall, the top wall includes an inner surface and an outer surface, the outer surface is provided with a plurality of heat dissipation fins, the plurality of heat dissipation fins surround a hollow area in the middle of the outer surface, adjacent heat dissipation fins form a heat dissipation channel, one end of the heat dissipation channel away from the hollow area is an air inlet, and an air outlet of the heat dissipation channel is formed above the hollow area and in the direction of the hollow area;

[0006] a power conversion circuit board, disposed in the housing, the power conversion circuit board comprising a DC conversion module, the DC conversion module being located at a position corresponding to the position of the hollow area, and the DC conversion module being in contact with the inner surface; and

[0007] A heat dissipation fan is arranged in the hollow area and is electrically connected to the power conversion circuit board.

[0008] In one or more optional embodiments above, the on-vehicle charging device includes a frame, the frame cover is arranged on a surface of the power conversion circuit board away from the top wall, and encloses an installation space with the power conversion circuit board, and the installation space is filled with thermal conductive gel;

[0009] The DC conversion module includes a rectifier, a transformer and a capacitor. The rectifier, the transformer and the capacitor are all arranged in the installation space, and at least part of the rectifier, at least part of the transformer and at least part of the capacitor are covered by the thermal conductive gel.

[0010] In one or more optional embodiments above, the housing includes a shell and a first cover plate, the shell includes a main body and a step portion arranged around the main body, the main body has a cavity with an opening facing downward, the step portion has a step plane arranged around the opening, and the first cover plate is sealingly connected to the step plane to close the opening;

[0011] The main body has the top wall, and the top wall is arranged opposite to the first cover plate.

[0012] In one or more of the above optional embodiments, the main body has a side wall, and the side wall is disposed adjacent to the top wall;

[0013] The vehicle-mounted charging device includes a plurality of electrical interfaces electrically connected to the power conversion circuit board, the plurality of electrical interfaces are fixed to the side wall, and the plurality of electrical interfaces include an input power interface, a first DC output interface, a signal input interface, and a second DC output interface.

[0014] In one or more optional embodiments above, the step portion has a step side surface arranged adjacent to the step plane, the step side surface protrudes toward the cavity to form a plurality of ribs, and the plurality of ribs abut against the outer peripheral wall of the first cover plate.

[0015] In one or more optional embodiments above, the vehicle-mounted charging device includes a second cover plate, which is fixedly connected to the top wall to shield the plurality of heat dissipation fins and the heat dissipation fan;

[0016] The second cover plate is provided with a ventilation hole, and the position of the ventilation hole corresponds to the position of the hollow area.

[0017] In one or more of the above optional embodiments, the vehicle-mounted charging device includes a connector assembly, and the connector assembly includes a first connector and a second connector, the first connector is electrically connected to the cooling fan, the second connector is electrically connected to the power conversion circuit board, and the second connector passes through the top wall and is pluggably connected to the first connector outside the outer shell.

[0018] In one or more of the above optional embodiments, the outer surface is provided with a limiting groove, the limiting groove is located in the hollow area, and the engaging portion of the first connector and the second connector is embedded in the limiting groove;

[0019] The second cover plate is provided with a support column, and one end of the support column away from the second cover plate is sleeved with a flexible member to abut against the joint portion.

[0020] In one or more of the above optional embodiments, the vehicle-mounted charging device includes a grounding screw, and the grounding screw passes through the top wall through a sealing gasket and is electrically connected to the power conversion circuit board in the cavity.

[0021] According to a second aspect of the present application, there is provided an electric tricycle comprising the above-mentioned on-board charging device.

[0022] The beneficial effect of the embodiment of the present application is that in the vehicle-mounted charging device mentioned in the utility model, the fan rotates in the hollow area to form negative pressure, attracting outside air into each heat dissipation channel through the air inlet, so as to comb the turbulence in each heat dissipation channel into rectification, and then discharge it through the air outlet, and take away the heat emitted by the DC conversion module, so that each fin can dissipate heat evenly, thereby improving the heat dissipation effect of the vehicle-mounted charging device. In addition, because each heat dissipation fin is integrated into the shell, it avoids the situation where there is still a gap between the separate radiator (wind guide cover and heat dissipation fan) after being installed and fixed on the shell, thereby effectively reducing thermal resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the prior art description. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0024] Figure 1 A schematic diagram of the structure of a vehicle-mounted charging device provided in one embodiment of the utility model;

[0025] Figure 2 for Figure 1 The schematic diagram of the structure of the vehicle-mounted charging device without the second cover plate is shown;

[0026] Figure 3 for Figure 1 The structural explosion diagram of the vehicle-mounted charging device is shown;

[0027] Figure 4 for Figure 2 Sectional view along line AA;

[0028] Figure 5 for Figure 2 The section view along line BB;

[0029] Figure 6 for Figure 1The schematic diagram of the structure of the vehicle-mounted charging device shown omits both the first cover plate and the second cover plate. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. The description of at least one exemplary embodiment below is actually only illustrative and is by no means intended to limit the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without carrying out creative work are within the scope of protection of this application.

[0031] Technologies, methods, and apparatus known to ordinary technicians in the relevant field may not be discussed in detail, but where appropriate, such technologies, methods, and apparatus should be considered part of the authorization specification.

[0032] In the description of the present application, it should be noted that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present application and simplifying the description. Unless otherwise stated, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present application. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0033] In the description of the present application, it should be noted that the use of terms such as "first" and "second" to limit components is merely to facilitate the distinction between corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present application.

[0034] The technical features involved in the different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0035] Figure 1 This is a schematic diagram of the structure of a vehicle-mounted charging device provided in one embodiment of the utility model. Figure 3 for Figure 1 The exploded diagram of the vehicle charging device is shown in Figure 1. Figure 1 and Figure 3 The vehicle-mounted charging device comprises: a housing 1, a power conversion circuit board 2 and a cooling fan 3. The power conversion circuit board 2 is arranged in the housing 1 and in contact with the housing 1, and the cooling fan 3 is fixed outside the housing 1 and is configured to accelerate the heat dissipation of the housing 1.

[0036] The housing 1 can be used as a carrier to carry the cooling fan 3 and protect the power conversion circuit board 2 and other electrical components of the vehicle-mounted charging device.

[0037] The housing 1 defines a cavity 1 a for accommodating the power conversion circuit board 2 and other unmentioned electrical components.

[0038] The housing 1 has a top wall 1111, and the top wall 1111 includes an inner surface facing the cavity 1a and an outer surface facing away from the cavity 1a. The inner surface is configured for the aforementioned power conversion circuit board 2 to be installed and fixed, and is in contact with the aforementioned power conversion circuit board 2. The outer surface is provided with a plurality of heat dissipation fins 13, and the plurality of heat dissipation fins 13 surround a hollow area 1b in the middle of the outer surface, and the hollow area 1b is used to accommodate the aforementioned heat dissipation fan 3. Adjacent heat dissipation fins 13 form a heat dissipation channel 1c, and the end of the heat dissipation channel 1c away from the hollow area 1b is an air inlet, and the air outlet of the heat dissipation channel 1c is formed above the hollow area 1b and in the direction of the hollow area 1b.

[0039] Please combine Figure 2 See also Figure 4 or Figure 5 In some embodiments, the cross-sectional shape of the housing 1 is roughly rectangular, and it includes a shell 11 and a first cover plate 12. The shell 11 includes a main body 111 and a step portion 112. The main body 111 has the aforementioned top wall 1111 and a peripheral side wall extending downward from the periphery of the top wall 1111. The top wall 1111 and the peripheral side wall together enclose a cavity 1a with an opening facing downward, and the power conversion circuit board 2 can be placed in the cavity 1a through the opening. The step portion 112 extends outward from an end surface of the peripheral side wall away from the top wall 1111, and the step portion 112 has a step plane (not shown) arranged around the opening. The first cover plate 12 is arranged opposite to the top wall 1111, and the first cover plate 12 is embedded in the step portion 112 and is sealed with the step plane to seal the opening of the cavity 1a.

[0040] In some embodiments, a stud is provided at the intersection of the adjacent two side walls of the peripheral side wall, and the screw hole of the stud is located on the step plane. The threaded fastener passes through the first cover plate 12 and the screw hole in turn and is screwed and fixed to the step surface, so as to embed the first cover plate 12 in the step portion 112. The advantage of adopting this technical solution is that the stud is no longer independently arranged in the shell 11, but is integrally connected with the peripheral side wall of the shell 11, thereby avoiding the situation that the stud is easy to touch and damage the shell 11 during assembly due to the structural strength of the stud being weak due to the excessive extension height of the stud. As an example, the number of studs is four, and the four studs are respectively arranged at the four corners of the shell 11, and the four threaded fasteners pass through the first cover plate 12 and the screw holes of the four studs and are screwed and fixed to the step surface.

[0041] It is understandable that the specific sealing method between the housing 11 and the first cover plate 12 is actually various, and is not limited in the various embodiments of the present utility model. For example, in some embodiments, a sealing rubber ring is sandwiched between the first cover plate 12 and the step plane to seal the gap between the two. For another example, in other embodiments, a sealant is filled in the gap between the first cover plate 12 and the step plane to achieve the sealing of the cavity 1a.

[0042] Figure 6 The schematic diagram of the structure of the vehicle-mounted charging device without the first cover plate and the second cover plate is shown in FIG. Figure 6 In some embodiments, the step portion 112 has a step side surface disposed adjacent to the step plane, and the step side surface protrudes toward the cavity 1a to form a plurality of convex ribs 1121, and the plurality of convex ribs 1121 abut against the outer peripheral wall of the first cover plate 12. By providing a plurality of convex ribs 1121 on the step side surface, the first cover plate 12 can be pre-positioned to improve the assembly efficiency of the first cover plate 12. Preferably, two adjacent step side surfaces enclosing the stud are respectively provided with a convex rib 1121, so as to facilitate accurate positioning of the first cover plate 12 and the screw hole of the stud.

[0043] In some embodiments, the housing 11 and the first cover plate 12 are both made of metal materials with good thermal conductivity, such as aluminum or aluminum alloy.

[0044] In some embodiments, both inner and outer surfaces of the housing 1 are coated with a black radiation absorbing coating, that is, both inner and outer surfaces of the shell 11 and inner and outer surfaces of the first cover plate 12 are coated with a black radiation absorbing coating.

[0045] For the power conversion circuit board 2, the power conversion circuit board 2 is fixed to the inner surface of the top wall 1111. The power conversion circuit board 2 includes an on-board charging module and a DC conversion module, and the electrical components on the on-board charging module and the DC conversion module are arranged on the surface of the power conversion circuit board 2 away from the top wall 1111. Among them, the on-board charging module is used to convert the AC power input by the input power interface 51 into DC power, and the DC conversion module is used to convert the DC power into a first DC power and a second DC power, and supply power to the first type of load and the second load through the first DC output interface 52 and the second DC output interface 54 respectively. Among them, the input power interface 51 is an AC input interface, which is used to receive the AC power provided by the power supply and transmit the AC power to the on-board charging module, and the on-board charging module is used to convert the AC power into DC power. As an example, the DC conversion module includes a rectifier, a transformer 21 and a capacitor.

[0046] In order to improve the heat dissipation efficiency of the DC conversion module, in some embodiments, the heat conductive member is disposed between the inner surface of the top wall 1111 and the surface of the power conversion circuit board 2 facing away from the DC conversion module, and is in contact with the inner surface of the top wall 1111 and the power conversion circuit board 2 respectively. Preferably, the position of the heat conductive member corresponds to the position of the DC conversion module. Examples of such heat conductive members include copper blocks, thermally conductive pads, or thermally conductive gels.

[0047] In order to achieve electrical insulation between the power conversion circuit board 2 and the housing 11, in some embodiments, an insulating film is sandwiched between the surface of the power conversion circuit board 2 away from the top wall 1111 except for the position of the DC conversion module and the top wall 1111, and a Mylar sheet is sandwiched between the surface of the power conversion circuit board 2 at the position of the DC conversion module and the top wall 1111. The advantage of this arrangement is that the combination of Mylar sheet and insulating film replaces the existing ceramic pole piece solution, avoiding the limitation and fixation of the ceramic pole piece, and also avoiding the problem of poor edge electrical protection caused by the ceramic assembly gap, simplifying the electrical protection of the whole machine.

[0048] like Figure 4 As shown, since electrical components such as rectifiers, transformers 21 and capacitors on the DC conversion module generate a lot of heat when in operation, which will affect the operating temperature of other electrical components, it is necessary to dissipate heat for these electrical components separately. For example, in some embodiments, the on-board charging device includes a frame 4, which is covered on the surface of the power conversion circuit board 2 away from the top wall 1111, and encloses an installation space with the power conversion circuit board 2, and the installation space is filled with thermal conductive gel. The rectifier, transformer 21 and capacitor are all arranged in the installation cavity, and at least part of the rectifier, at least part of the transformer 21 and at least part of the capacitor are covered with thermal conductive gel. As an example, the frame 4 is made of a metal material such as aluminum or aluminum alloy.

[0049] like Figures 1 to 6 As shown in any of the figures, in some embodiments, one of the side walls of the peripheral side wall can serve as an electrical interface mounting wall for multiple electrical interfaces 5 to be described in detail below. The vehicle-mounted charging device includes multiple electrical interfaces 5 electrically connected to the power conversion circuit board 2, and the multiple electrical interfaces 5 are fixedly arranged on the electrical interface mounting wall. The multiple electrical interfaces 5 include an input power interface 51, a first DC output interface 52, a signal input interface 53, and a second DC output interface 54.

[0050] Among them, the input power interface 51 is electrically connected to the input end of the power conversion circuit, used to receive the input power and transmit the input power to the power conversion circuit, the power conversion circuit is used to convert the input power into at least one of a first direct current and a second direct current, and the voltage of the first direct current is lower than the voltage of the second direct current.

[0051] The first DC output interface 52 is used to receive the first DC power and to supply power to the first type of load of the electric tricycle, wherein the first type of load is a low voltage load, and illustratively, the first type of load includes at least one of a headlight, a USB interface and a dashboard.

[0052] The signal input interface 53 is used to receive or send a control signal, and the control signal is used to control the operation of the power conversion circuit or to control the operation of a device outside the vehicle-mounted charging device.

[0053] The second DC output interface 54 is used to receive the second DC power and to supply power to the second type of load of the electric tricycle. The second type of load is a high voltage load, for example, the second type of load may be a power battery, and the power battery is used to supply power to the power system of the electric tricycle.

[0054] In some embodiments, the power source may be an AC power source, and examples of such power sources include an AC power grid, an AC charging pile, or an uninterruptible power system (UPS). Exemplarily, the power source may be an AC power grid, and the on-board charging device may be electrically connected to the power source and receive AC power, and then the on-board charging device converts the received AC power into a first DC power and a second DC power, wherein the first DC power supplies power to the first type of load, and the second DC power supplies power to the second type of load.

[0055] In some embodiments, the on-board charging device is electrically connected to the vehicle controller through the signal input interface 53, and the vehicle controller is used to send a control signal to the on-board charging device to optimize the overall energy distribution. Specifically, the vehicle controller transmits a control signal to the power conversion circuit board 2 through the signal input interface 53, and the control signal includes but is not limited to a pulse width modulation (PWM) signal, a voltage sampling signal, a current sampling signal, etc. The signal input interface 53 is also electrically connected to a device outside the on-board charging device, such as an electronic lock or a charging line temperature monitoring device, for sending a control signal to an external device to realize electronic lock driving, charging line temperature detection, etc. Among them, the control signal is also a low-voltage signal.

[0056] As for the cooling fan 3, it is arranged in the hollow area 1b and is electrically connected to the power conversion circuit board 2. In the vehicle-mounted charging device mentioned in the utility model, the fan rotates in the hollow area 1b to form a negative pressure, attracting the outside air to enter each cooling channel 1c through the air inlet, so as to comb the turbulent flow in each cooling channel 1c into a rectifier, and then discharge it through the air outlet, and take away the heat emitted by the DC conversion module, so that each fin can dissipate heat evenly, thereby improving the heat dissipation effect of the vehicle-mounted charging device. In addition, because each cooling fin 13 is integrated into the shell 11, it avoids the situation where there is still a gap between the separate radiator (wind guide cover and cooling fan 3) after being installed and fixed on the shell 1, thereby effectively reducing the thermal resistance.

[0057] like Figure 2 As shown, in order to facilitate the electrical connection between the cooling fan 3 and the power conversion circuit board 2, in some embodiments, the vehicle-mounted charging device includes a connector assembly 6, the connector assembly 6 includes a first connector 61 and a second connector 62 adapted to the first connector 61, the first connector 61 is electrically connected to the electrical connection end of the cooling fan 3, the second connector 62 is electrically connected to the power conversion circuit board 2, and the second connector 62 passes through the top wall 1111 and is pluggably connected to the first connector 61 outside the top wall 1111. As an example, the connector assembly 6 is a floating connector.

[0058] Since the second connector 62 passes through the top wall 1111, there will be a gap between the position where the second connector 62 passes through the top wall 1111, and water vapor will enter the cavity 1a through the gap, affecting the normal operation of the electrical components on the power conversion circuit board 2. Furthermore, along the surface of the top wall 1111 facing the cavity 1a to the surface of the top wall 1111 away from the cavity 1a, the gap is filled with a sealing gasket and a potting glue in sequence. As an example, the sealing gasket is a silicone gasket.

[0059] Continue as Figure 1 and Figure 4 As shown, in some embodiments, the vehicle-mounted charging device includes a second cover plate 7, which is fixedly connected to the top wall 1111 to shield the plurality of heat dissipation fins 13 and the heat dissipation fan 3. The second cover plate 7 is provided with ventilation holes 7a corresponding to the position of the hollow area 1b. In this way, the second cover plate 7 can protect the plurality of heat dissipation fins 13 and separate the heat dissipation channel 1c from the external environment, so that the external gas only flows into each heat dissipation channel 1c through each air inlet to improve the combing efficiency of turbulence.

[0060] Furthermore, the outer surface is provided with a limiting groove (not shown), the limiting groove is located in the hollow area 1b, and the joint part of the first connector 61 and the second connector 62 is embedded in the limiting groove. The second cover plate 7 is provided with a support column, and a flexible member is sleeved on one end of the support column away from the second cover plate 7 to abut against the joint part. As an example, the flexible member is a silicone pad. Since the support column is pressed to replace the wire binding or glue fixation in the related art, it is convenient for subsequent disassembly and assembly.

[0061] In some embodiments, the vehicle charging device includes a balancing valve, which is arranged on one of the side walls of the peripheral wall except the wall where the electrical interface 5 is installed, and connects the cavity 1a with the external environment when the pressure of the cavity 1a is inconsistent with that of the external environment. Preferably, the balancing valve is arranged on the side wall of the peripheral wall opposite to the wall where the electrical interface 5 is installed.

[0062] Continue as Figure 5 As shown, in order to facilitate the grounding test of the vehicle-mounted charging device, in some embodiments, the vehicle-mounted charging device includes a grounding screw 9, which passes through the top wall 1111 through a sealing gasket and is electrically connected to the power conversion circuit board 2 in the cavity 1a.

[0063] Based on the same technical concept, an embodiment of the utility model also provides an electric tricycle, which includes a vehicle body and a driving wheel. The on-board charging device of any of the above embodiments is installed on the vehicle body, and the on-board charging device is used to provide electrical energy to various electrical components in the electric tricycle and drive the driving wheel to rotate.

[0064] The above descriptions are merely embodiments of the present application and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A vehicle-mounted charging device, characterized in that: include: The housing has a top wall, the top wall includes an inner surface and an outer surface, the outer surface is provided with a plurality of heat dissipation fins, the plurality of heat dissipation fins surround a hollow area in the middle of the outer surface, adjacent heat dissipation fins form a heat dissipation channel, one end of the heat dissipation channel away from the hollow area is an air inlet, and an air outlet of the heat dissipation channel is formed above the hollow area and in the direction of the hollow area; a power conversion circuit board, disposed in the housing, the power conversion circuit board comprising a DC conversion module, the DC conversion module being located at a position corresponding to the position of the hollow area, and the DC conversion module being in contact with the inner surface; and A heat dissipation fan is arranged in the hollow area and is electrically connected to the power conversion circuit board.

2. The vehicle-mounted charging device according to claim 1, characterized in that: The vehicle-mounted charging device comprises a surrounding frame, the surrounding frame cover is arranged on the surface of the power conversion circuit board away from the top wall, and encloses an installation space with the power conversion circuit board, and the installation space is filled with thermal conductive gel; The DC conversion module includes a rectifier, a transformer and a capacitor. The rectifier, the transformer and the capacitor are all arranged in the installation space, and at least part of the rectifier, at least part of the transformer and at least part of the capacitor are covered by the thermal conductive gel.

3. The vehicle-mounted charging device according to claim 1, characterized in that: The housing comprises a shell and a first cover plate, the shell comprises a main body and a step portion arranged around the main body, the main body has a cavity with an opening facing downward, the step portion has a step plane arranged around the opening, and the first cover plate is sealedly connected to the step plane to close the opening; The main body has the top wall, and the top wall is arranged opposite to the first cover plate.

4. The vehicle-mounted charging device according to claim 3, characterized in that: The main body has a side wall, and the side wall is arranged adjacent to the top wall; The vehicle-mounted charging device includes a plurality of electrical interfaces electrically connected to the power conversion circuit board, the plurality of electrical interfaces are fixed to the side wall, and the plurality of electrical interfaces include an input power interface, a first DC output interface, a signal input interface, and a second DC output interface.

5. The vehicle-mounted charging device according to claim 3, characterized in that: The step portion has a step side surface disposed adjacent to the step plane, and the step side surface protrudes toward the cavity to form a plurality of convex ribs, and the plurality of convex ribs abut against the outer peripheral wall of the first cover plate.

6. The vehicle-mounted charging device according to claim 3, characterized in that: The vehicle-mounted charging device includes a second cover plate, which is fixedly connected to the top wall to shield the plurality of heat dissipation fins and the heat dissipation fan; The second cover plate is provided with a ventilation hole, and the position of the ventilation hole corresponds to the position of the hollow area.

7. The vehicle-mounted charging device according to claim 6, characterized in that: The vehicle-mounted charging device includes a connector assembly, which includes a first connector and a second connector. The first connector is electrically connected to the cooling fan, the second connector is electrically connected to the power conversion circuit board, and the second connector passes through the top wall and is pluggably connected to the first connector outside the housing.

8. The vehicle-mounted charging device according to claim 7, characterized in that: The outer surface is provided with a limiting groove, the limiting groove is located in the hollow area, and the engaging portion of the first connector and the second connector is embedded in the limiting groove; The second cover plate is provided with a support column, and one end of the support column away from the second cover plate is sleeved with a flexible member to abut against the joint portion.

9. The vehicle-mounted charging device according to any one of claims 3 to 8, characterized in that: The vehicle-mounted charging device comprises a grounding screw, and the grounding screw passes through the top wall through a sealing gasket and is electrically connected to the power conversion circuit board in the cavity.

10. An electric tricycle, characterized in that: It comprises the vehicle-mounted charging device as described in any one of claims 1-9.

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