CN222485173U - Vehicle-mounted charger - Google Patents

Abstract

The utility model provides a vehicle-mounted charger which comprises a shell, wherein the top of the shell is provided with an opening, a control circuit board is arranged at the opening, a cooling liquid flow channel is arranged in the shell, a liquid inlet nozzle and a liquid outlet nozzle which are communicated with the cooling liquid flow channel are arranged outside the shell, a metal substrate is arranged on the outer side wall of the flow channel of the cooling liquid flow channel in the shell, a plurality of rows of patch switch tubes which are electrically connected with the control circuit board are arranged on the metal substrate, partition plates which are arranged on two sides of the cooling liquid flow channel in the shell and are matched with the side parts of the shell to form a filtering cavity are arranged in the shell, a filtering module which is electrically connected with the control circuit board is arranged in the filtering cavity, and the partition plates comprise isolation parts which are arranged between the filtering module and the metal substrate.

Description

Vehicle-mounted charger

Technical Field

The utility model belongs to the field of automobile charging, and particularly relates to a vehicle-mounted charger.

Background

Along with the demands of energy conservation, emission reduction and atmospheric pollution control, new energy automobiles are gradually commercially available in markets, and electric automobiles are the dominant force of the new energy automobiles. Among them, an On Board Charger (OBC) is an important component in an electric vehicle.

At present, the weight of automobile parts is required to be reduced, and the size of the vehicle-mounted charger is also gradually reduced. Because a large number of circuit elements are integrated in the vehicle-mounted charger, the installation structure and the installation mode of the circuit elements still have optimization space. In addition, the existing vehicle-mounted charger generally further comprises a filter, and the filter can generate electromagnetic interference to other electronic components in the vehicle-mounted charger, so that stable operation of the vehicle-mounted charger is not facilitated.

Disclosure of utility model

In order to solve the defects in the prior art, the utility model provides a vehicle-mounted charger.

The technical scheme adopted by the utility model is that the vehicle-mounted charger comprises a shell, a charging device and a charging device, wherein the top of the shell is provided with an opening, and a control circuit board is arranged at the opening;

A cooling liquid flow passage is arranged in the shell;

A metal substrate is arranged on the outer side wall of the cooling liquid flow passage inside the shell, and a plurality of rows of patch switch tubes electrically connected with the control circuit board are arranged on the metal substrate;

The filter module is characterized in that a baffle plate which is matched with the side part of the shell to form a filter cavity is arranged in the shell, the filter module which is electrically connected with the control circuit board is arranged in the filter cavity, and the baffle plate comprises an isolation part which is positioned between the filter module and the metal substrate.

Further, the filtering module comprises a filtering circuit board parallel to the control circuit board, a connecting piece electrically connected with the control circuit board is arranged on one side of the filtering circuit board, and a filtering device is arranged on the other side of the filtering circuit board.

Further, the filter module further comprises a shielding cover, the shielding cover comprises a top shielding part and a side shielding part extending vertically from the side edge of the top shielding part, the top shielding part is arranged between the filter circuit board and the control circuit board, and the side shielding part is arranged between the filter module and the shell and/or the partition board.

Further, the filter module further includes an insulating cover including a top insulating portion disposed between the top shielding portion and the control circuit board.

Further, a first heat conducting material for filling a gap between the filtering module and the shell or the partition plate is arranged in the filtering cavity.

Further, the metal substrate is fixed on the outer side wall of the runner in a welding connection or adhesive connection or screw connection mode;

And a second heat conduction material is arranged between the metal substrate and the outer side wall of the runner.

Further, the junction of the outer side wall of the runner and the bottom of the shell is provided with an arc-shaped step surface or a right angle.

Further, the junction of runner lateral wall with the casing bottom sets up to the arc step face, the metal substrate bottom is equipped with corresponding to the inclined plane of arc step face.

Further, a liquid inlet nozzle and a liquid outlet nozzle which are communicated with the cooling liquid in a flowing way are arranged outside the shell.

Further, the cooling liquid runner comprises a first side runner and a second side runner which are arranged at intervals, and a switching runner which is communicated with the first side runner and the second side runner, a liquid inlet end of the first side runner is communicated with the liquid inlet nozzle, and a liquid outlet end of the second side runner is communicated with the liquid outlet nozzle.

Further, the cooling liquid flow channel also comprises a flat flow channel which is communicated with the first side flow channel and the second side flow channel;

The advection channel is also communicated with the transfer channel.

Further, the first side runner, the second side runner and the runner inner side wall of the transfer runner are matched with the bottom of the shell to form a built-in cavity, and a magnetic device electrically connected with the control circuit board is arranged in the built-in cavity.

Further, a third heat conducting material for filling a gap between the magnetic device and the inner side wall of the flow passage is arranged in the built-in cavity.

Further, the bottom in the built-in cavity is provided with radiating fins.

Further, the liquid inlet nozzle and the liquid outlet nozzle are arranged on the same side outside the shell;

Or the liquid inlet nozzle and the liquid outlet nozzle are arranged on two sides of the outer part of the shell.

Compared with the prior art, the vehicle-mounted charger provided by the utility model has the beneficial effects that:

1. The filtering module with independent design is adopted to be isolated from the control part, and is placed in the filtering cavity positioned at two sides of the cooling liquid flow channel, so that good EMC effect is ensured, and meanwhile, the heat dissipation effect is improved.

2. The metal substrate with the patch switch tube is arranged on the outer side wall of the cooling liquid flow channel, so that the three-dimensional space inside the shell is effectively utilized, the product volume is reduced, and the heat dissipation effect is improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is an overall explosion schematic diagram of a vehicle-mounted charger provided by an embodiment of the utility model;

Fig. 2 is a schematic diagram of the overall structure of the vehicle-mounted charger according to the embodiment of the present utility model;

Fig. 3 is a schematic diagram of a layout manner of a water inlet and outlet nozzle of a vehicle-mounted charger according to an embodiment of the present utility model;

Fig. 4 is a schematic diagram II of a layout mode of a water inlet and outlet nozzle of the vehicle-mounted charger according to the embodiment of the utility model;

Fig. 5 is a schematic diagram III of a layout mode of a water inlet and outlet nozzle of a vehicle-mounted charger according to an embodiment of the present utility model;

FIG. 6 is a bottom transverse cross-sectional view of FIG. 5;

FIG. 7 is a side longitudinal cross-sectional view of FIG. 5;

FIG. 8 is an exploded view of a metal substrate and a coolant flow channel according to an embodiment of the present utility model;

FIG. 9 is a cross-sectional view of a filter module, a magnetic device, a metal substrate and a control circuit board according to an embodiment of the present utility model;

Fig. 10 is a schematic perspective view of a first filtering module according to an embodiment of the present utility model;

fig. 11 is a side view of a first filter module according to an embodiment of the present utility model;

fig. 12 is a top view of a first filtering module according to an embodiment of the present utility model;

Fig. 13 is a schematic perspective view of a second filtering module according to an embodiment of the present utility model;

fig. 14 is a side view of a second filter module according to an embodiment of the present utility model;

fig. 15 is a top view of a second filtering module according to an embodiment of the present utility model;

Wherein, each reference numeral in the figure mainly marks:

10. The device comprises a shell, a first partition plate, a 12, a second partition plate, a 13, a first filtering cavity, a 14, a second filtering cavity, a 15, a liquid inlet nozzle, a 16, a liquid outlet nozzle, a 17, an arc-shaped step surface, a 18, a built-in cavity, a 19 and radiating fins;

20. Cooling liquid flow passage, 21, first side flow passage, 22, second side flow passage, 23, switching flow passage, 24, second heat conduction material, 25, horizontal flow passage, 251, first horizontal flow passage part, 252, second horizontal flow passage part, 253, separation strip;

30. 31, a patch switch tube, 32, a terminal, 33, and an inclined plane;

41. a first magnetic device 42, a second magnetic device;

50. First filter module, 51, first filter circuit board, 52, first power connector, 53, first signal connector, 54, first filter device, 55, first shield, 551, first top shield, 552, second side shield, 56, first mounting portion, 57, first insulating cover, 571, first top insulating portion, 572, first side insulating portion;

60. The second filter module, 61, a second filter circuit board, 62, a second power connector, 63, a second signal connector, 64, a second filter device, 65, a second shielding cover, 651, a second top shielding part, 652, a second side shielding part, 66, a second mounting part, 67, a second insulating cover, 671, a second insulating cover, 672, a second top insulating part;

70. a control circuit board;

80. s-shaped bent pieces.

Detailed Description

In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the utility model is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.

Referring to fig. 1 and 2, the vehicle-mounted charger provided by the utility model comprises a housing 10, and a cooling liquid flow channel 20, a metal substrate 30, a filtering module and a magnetic device which are arranged in the housing 10.

As shown in fig. 1 and 9, a housing space is provided inside the casing 10 for accommodating the coolant flow passage 20, the metal substrate 30, the filter module, and the like. The top of the housing 10 is provided with an opening where the control circuit board 70 is provided. The outside of the shell 10 is provided with a liquid inlet nozzle 15 and a liquid outlet nozzle 16 which are communicated with the cooling liquid flow channel 20.

It should be noted that the layout of the liquid inlet nozzle 15 and the liquid outlet nozzle 16 is not limited in the present utility model, and the specific positions of the liquid inlet nozzle 15 and the liquid outlet nozzle 16 may be flexibly set according to actual requirements. Several specific examples are now provided, as shown in fig. 3, with the liquid inlet nozzle 15 and the liquid outlet nozzle 16 being provided on opposite sides of the exterior of the housing 10. As shown in fig. 4, the liquid inlet nozzle 15 and the liquid outlet nozzle 16 are provided on the rear side outside the housing 10. As shown in fig. 5, the liquid inlet nozzle 15 and the liquid outlet nozzle 16 are provided on the front side outside the housing 10. Hereinafter, description will be made taking an example in which the liquid inlet nozzle 15 and the liquid outlet nozzle 16 are provided at the front side outside the housing 10.

As shown in fig. 6, the coolant flow passage 20 is provided in an intermediate region inside the casing 10. The cooling liquid flow channel 20 comprises a first side flow channel 21, a second side flow channel 22 and a switching flow channel 23, wherein the first side flow channel 21 and the second side flow channel 22 are arranged at intervals, the switching flow channel 23 is used for communicating the first side flow channel 21 with the second side flow channel 22, the liquid inlet end of the first side flow channel 21 is communicated with the liquid inlet nozzle 15, and the liquid outlet end of the second side flow channel 22 is communicated with the liquid outlet nozzle 16. The cooling liquid enters from the liquid inlet nozzle 15, sequentially passes through the first side flow passage 21, the switching flow passage 23 and the second side flow passage 22, and then flows out from the liquid outlet nozzle 16. In the process, the cooling liquid can take away the heat generated by the heating device in the shell 10, so that the heat dissipation of the vehicle-mounted charger is realized.

As shown in fig. 7, 8 and 9, in order to better enhance the heat dissipation effect of the vehicle-mounted battery charger, the cooling liquid flow channel 20 further includes a flat flow channel 25, the flat flow channel 25 is communicated with the first side flow channel 21 and the second side flow channel 22, and the flat flow channel 25 is also communicated with the switching flow channel 23. According to the utility model, bottom heat dissipation can be realized by adding the flat flow channel 25, so that the heat dissipation area is increased, and the heat dissipation effect is further improved.

As shown in fig. 9, the flat flow channel 25 includes a first flat flow channel portion 251 and a second flat flow channel portion 252, and a partition strip 253 for partitioning the first flat flow channel portion 251 from the second flat flow channel portion 252. It should be understood that the extending direction of the dividing strip 253 coincides with the extending direction of the first side flow passage 21 and the second side flow passage 22. The end of the first flat flow passage part 251 away from the liquid inlet nozzle 15 is communicated with the transfer flow passage 23, the end of the second flat flow passage part 252 away from the liquid outlet nozzle 16 is communicated with the transfer flow passage 23, meanwhile, one side of the first flat flow passage part 251 away from the dividing strip 253 is communicated with the first side flow passage 21, and one side of the second flat flow passage part 252 away from the dividing strip 253 is communicated with the second side flow passage 22. The cooling liquid enters from the liquid inlet nozzle 15, passes through the first side flow channel 21 and the first flat flow channel part 251, passes through the switching flow channel 23, passes through the second side flow channel 22 and the second flat flow channel part 252, and finally flows out from the liquid outlet nozzle 16.

As shown in fig. 8 and 9, the metal substrate 30 is disposed on the outer side wall of the cooling liquid channel 20, where the metal substrate 30 is perpendicular to the control circuit board 70, and a plurality of rows of patch switch tubes 31 electrically connected to the control circuit board 70 are disposed on the metal substrate 30. Compared with the prior art, the utility model adopts the metal substrate 30 provided with the plurality of rows of patch switch tubes 31 to replace the plug switch tubes, and the metal substrate 30 is vertical to the control circuit board 70, thereby not only effectively utilizing the three-dimensional space and reducing the length and width dimensions of the power converter to provide the power density of unit space, but also being more beneficial to heat exchange between the switch tubes and the metal substrate 30 and the cooling liquid in the cooling liquid flow channel 20, and further improving the heat dissipation effect of the vehicle-mounted charger.

There are various connection modes between the metal substrate 30 and the outer side wall of the flow channel in the present utility model. For example, the metal substrate 30 is fixed to the outer side wall of the flow channel by means of a welded connection, or an adhesive connection or a screw connection.

In one example, the metal base plate 30 is secured to the runner outer side wall by means of a welded connection. The gap between the metal substrate 30 and the outer side wall of the runner is filled with solder with good heat conduction performance, so that the connecting and fixing effects can be achieved, and the contact thermal resistance can be reduced.

In another example, the metal base plate 30 is fixed to the flow channel outer side wall by means of an adhesive connection. The gap between the metal substrate 30 and the outer side wall of the runner is filled with heat-conducting silica gel, so that the connecting and fixing effects can be achieved, and the contact thermal resistance can be reduced.

In yet another example, the metal base plate 30 is secured to the runner outer side wall by a threaded connection. The thermal interface material (i.e., TIM material) is used to fill the gap between the metal substrate 30 and the outer sidewall of the runner, so as to reduce the contact thermal resistance, and the metal substrate 30 is fixedly connected with the outer sidewall of the runner by bolts.

As shown in fig. 8, two rows of patch switch tubes 31 are provided on the metal substrate 30, each row includes two patch switch tubes 31, and a terminal 32 for electrically connecting with the control circuit board 70 is provided on top of the metal substrate 30. Of course, in other embodiments, the number of rows of the patch switch tubes 31 and the number in each row may be set as required.

In order to enhance the heat conduction effect of the metal substrate 30, a second heat conducting material 24 is disposed between the metal substrate 30 and the outer side wall of the cooling liquid flow passage 20. Preferably, the second thermally conductive material 24 may be a thermally conductive silicone gel or a thermally conductive silicone grease.

In addition, the connection between the outer side wall of the flow channel and the bottom of the shell 10 is provided with an arc-shaped step surface 17, and the bottom of the metal substrate 30 (i.e. the side of the metal substrate 30 near the bottom of the shell 10) is provided with an inclined surface 33 corresponding to the arc-shaped step surface 17. The design can reduce the gap between the metal substrate 30 and the bottom of the shell 10, thereby being beneficial to the utilization of space and reducing the volume of products.

Of course, in other examples, the connection between the outer side wall of the flow channel and the bottom of the housing 10 may be set at a right angle, and the bottom of the metal substrate 30 (i.e., the side of the metal substrate 30 near the bottom of the housing 10) is set at 90 degrees.

As shown in fig. 9, the flow path outer side walls of the coolant flow path 20 include the flow path outer side wall of the first side flow path 21 and the flow path outer side wall of the second side flow path 22. The metal substrate 30 is provided on the flow path outer side wall of the first side flow path 21 and the flow path outer side wall of the second side flow path 22. The metal substrate 30 on the side of the first side flow channel 21 and the metal substrate 30 on the side of the second side flow channel 22 may be provided with different types of patch switch tubes 31, and the shapes of the different types of patch switch tubes 31 may be different. In addition, in the vicinity of the metal substrate 30 on the side of the second side flow path 22, an S-shaped bent piece 80 for grounding is provided on the housing 10, and the S-shaped bent piece 80 is connected to the housing 10 by bolts.

As shown in fig. 1, 6, 7 and 9, the inner side walls of the first side runner 21, the second side runner 22 and the transfer runner 23 are matched to form a built-in cavity 18, and a magnetic device electrically connected with the control circuit board 70 is arranged in the built-in cavity. The magnetic devices include first and second magnetic devices 41 and 42 of different types, which differ in shape from one magnetic device to another.

To better enhance the heat transfer effect of the magnetic device, a third thermally conductive material is disposed within the internal cavity 18 for filling the gap between the magnetic device and the inner sidewall of the flow channel. Preferably, the third thermally conductive material may be a thermally conductive silicone gel or a thermally conductive silicone grease.

In addition, as shown in fig. 7, a heat dissipation fin 19 is further disposed at the bottom of the internal cavity 18, so as to increase the contact area between the magnetic device and the cooling liquid flow channel 20, and further facilitate heat dissipation of the magnetic device. The heat dissipation fins 19 may be any one of tooth fins, cylindrical fins, and rectangular fins.

As shown in fig. 1, 5 and 9, a partition board is arranged inside the casing 10 and is matched with the side part of the casing 10 to form a filtering cavity, a filtering module electrically connected with the control circuit board 70 is arranged inside the filtering cavity, the partition board comprises an isolation part positioned between the filtering module and the metal substrate 30, and different filtering modules and the metal substrate 30 can be separated by the design, so that the filtering module is guaranteed to have good electromagnetic shielding performance. To better enhance the heat transfer effect of the magnetic device, a first heat conductive material is provided in the filter cavity for filling the gap between the filter module and the housing 10 or the separator. Preferably, the first thermally conductive material may be a thermally conductive silicone gel or a thermally conductive silicone grease.

The filter module comprises a filter circuit board, an insulating cover and an insulating cover. Wherein, the filter circuit board is parallel to the control circuit board 70, and one side of the filter circuit board is provided with a connecting piece electrically connected with the control circuit board 70, and the connecting piece comprises a power connecting piece and a signal connecting piece, and the other side of the filter circuit board is provided with a filter device. Wherein, the shield cover includes top shielding portion and side shielding portion that extends along vertical from the side edge of top shielding portion, and filter circuit board and control circuit board 70 are located to top shielding portion, and between filter module and casing 10 and/or the baffle were located to side shielding portion, can reduce external radiation through setting up the shield cover. Wherein, the insulating boot is including locating the top insulating part between top shielding part and the control circuit board 70, and top insulating part locates between top shielding part and the control circuit board 70, can guarantee the insulating properties between the adjacent circuit board through setting up the insulating boot.

As shown in fig. 1, the filter modules include first and second filter modules 50 and 60 of different types, which have different shapes. The specific structure of the first filter module 50 and the second filter module 60 will be explained below.

As shown in fig. 10, 11, and 12, the first filtering module 50 is an input AC filter. The first filter module 50 includes a first filter circuit board 51, a first shield case 55 and a first insulation case 57. One side of the first filter circuit board 51 is provided with a first power connector 52 and two first signal connectors 53, and the other side of the first filter circuit board 51 is provided with a plurality of first filter devices 54, wherein the plurality of first filter devices 54 comprise piezoresistors, common-mode inductors and capacitors. The first shield 55 includes a first top shield 551 and a plurality of first side shields integrally formed, and a plurality of first mounting portions 56 are further provided on the first top shield 551 for fixing the entire shield to the first filter circuit board 51 and performing a grounding process. The first insulating cover 57 includes a first top insulating portion 571 and a first side insulating portion 572 that are integrally formed, the first top insulating portion 571 being provided on the first top shielding portion 551, the first side insulating portion 572 being on the same side as one of the first side shielding portions.

As shown in fig. 13, 14, and 15, the second filter module 60 is an output HV filter, and the second filter module 60 includes a second filter circuit board 61, a second shield 65, and a second insulation cover 671. Wherein, a second power connector 62 and a second signal connector 63 electrically connected with the control circuit board 70 are arranged on one side of the second filter circuit board 61, and a plurality of second filter devices 64 are arranged on the other side of the second filter circuit board 61. The plurality of second filter devices 64 includes piezoresistors, common mode inductances and capacitances. The second shield 65 includes a second top shield portion 651 and a second side shield portion 652 integrally formed, and a plurality of second mounting portions 66 are provided on the second top shield portion 651 for fixing the entire shield to the second filter circuit board 61 and performing a grounding process. The second insulating cover 671 is a second top insulating portion 672 provided on the second top shielding portion 651.

As shown in fig. 1, 2 and 5, a first partition 11 and a second partition 12 are disposed inside the housing 10, the first partition 11 and the housing 10 are combined to form a first filter cavity 13, and the second partition 12 and the housing 10 are combined to form a second filter cavity 14. The first filter module 50 is placed in the first filter cavity and the second filter module 60 is placed in the second filter cavity 14.

The vehicle-mounted charger provided by the utility model adopts the independently designed filter module and the metal substrate provided with the patch switch tube, so that signal interference among the filter module and the metal substrate is reduced, and effective separation and shielding are realized. Meanwhile, the filtering module and the metal substrate are arranged on the outer side of the cooling liquid flow channel, the magnetic device is arranged on the inner side of the cooling liquid flow channel, heat exchange between the heating device in the shell and the cooling liquid flow channel is guaranteed, and the heat dissipation effect of the vehicle-mounted charger is effectively improved.

On the one hand, the input end AC filter, the output end HV filter and the control part are independently separated to form an independently designed filter module, the filter module is provided with a shielding cover and an insulating cover, an interface and an interactive interface which are electrically connected with a control circuit board are reserved, filter cavities are arranged on two sides of a cooling fluid channel in the shell, and the filter module is placed in the filter cavities, so that the filter module is guaranteed to have good EMC effect and heat dissipation effect.

On the other hand, the metal substrate provided with the patch switch tube is adopted to replace the plug-in switch tube, the metal substrate and the control circuit board are vertically arranged, the metal substrate is arranged on the outer side wall of the cooling liquid flow channel, a 45-degree inclined plane is arranged at the joint of the metal substrate and the bottom of the shell, the three-dimensional space inside the shell is fully utilized, the volume is reduced by 30%, and meanwhile, the heat dissipation effect of the metal substrate is guaranteed.

The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the utility model.

Claims (15)

1. The vehicle-mounted charger is characterized by comprising a shell (10), wherein the top of the shell (10) is provided with an opening, and a control circuit board (70) is arranged at the opening;

a cooling liquid flow passage (20) is arranged in the shell (10);

A metal substrate (30) is arranged on the outer side wall of the cooling liquid flow channel (20) inside the shell (10), and a plurality of rows of patch switch tubes (31) electrically connected with the control circuit board (70) are arranged on the metal substrate (30);

The filter is characterized in that a baffle plate which is matched with the side part of the shell (10) to form a filter cavity is arranged in the shell (10), a filter module which is electrically connected with the control circuit board (70) is arranged in the filter cavity, and the baffle plate comprises an isolation part which is positioned between the filter module and the metal substrate (30).

2. The vehicle-mounted charger according to claim 1, wherein the filter module comprises a filter circuit board parallel to the control circuit board (70), one side of the filter circuit board is provided with a connecting piece electrically connected with the control circuit board (70), and the other side of the filter circuit board is provided with a filter device.

3. The vehicle-mounted charger according to claim 2, wherein the filter module further comprises a shield case including a top shield portion and a side shield portion extending vertically from a side edge of the top shield portion, the top shield portion being provided between the filter circuit board and the control circuit board (70), the side shield portion being provided between the filter module and the housing (10) and/or the partition plate.

4. The vehicle-mounted charger of claim 3 wherein said filter module further comprises an insulating cover comprising a top insulation disposed between said top shield and said control circuit board (70).

5. The vehicle-mounted charger according to claim 1, wherein a first heat conducting material is provided in the filter cavity for filling a gap between the filter module and the housing (10) or the partition.

6. The vehicle-mounted charger according to claim 1, wherein the metal substrate (30) is fixed on the outer side wall of the flow channel by means of welding connection, or adhesive connection or screw connection;

a second heat conducting material (24) is arranged between the metal substrate (30) and the outer side wall of the runner.

7. The vehicle-mounted charger according to claim 1, wherein the junction of the outer side wall of the flow channel and the bottom of the housing (10) is provided as an arc-shaped step surface (17) or as a right angle.

8. The vehicle-mounted charger according to claim 7, wherein an arc-shaped step surface (17) is arranged at the joint of the outer side wall of the runner and the bottom of the shell (10), and an inclined surface (33) corresponding to the arc-shaped step surface (17) is arranged at the bottom of the metal substrate (30).

9. The vehicle-mounted charger according to claim 1, wherein a liquid inlet nozzle (15) and a liquid outlet nozzle (16) which are communicated with the cooling liquid flow channel are arranged outside the shell (10).

10. The vehicle-mounted charger according to claim 9, wherein the cooling liquid flow channel (20) comprises a first side flow channel (21) and a second side flow channel (22) which are arranged at intervals, and a transfer flow channel (23) which is communicated with the first side flow channel (21) and the second side flow channel (22), a liquid inlet end of the first side flow channel (21) is communicated with the liquid inlet nozzle (15), and a liquid outlet end of the second side flow channel (22) is communicated with the liquid outlet nozzle (16).

11. The vehicle-mounted charger according to claim 10, wherein the coolant flow passage (20) further includes a flat flow passage (25), the flat flow passage (25) being in communication with the first side flow passage (21) and the second side flow passage (22);

The advection channel (25) is also communicated with the transfer channel (23).

12. The vehicle-mounted charger according to claim 10, wherein the first side runner (21), the second side runner (22) and the runner inner side wall of the switching runner (23) are combined to form a built-in cavity (18), and a magnetic device electrically connected with the control circuit board (70) is arranged in the built-in cavity (18).

13. The vehicle-mounted charger of claim 12, wherein a third thermally conductive material is disposed within the interior cavity (18) for filling a gap between the magnetic device and the flow channel interior sidewall.

14. The vehicle-mounted charger according to claim 13, wherein a heat dissipation fin (19) is provided at an inner bottom of the built-in cavity (18).

15. The vehicle-mounted charger according to claim 9, wherein the liquid inlet nozzle (15) and the liquid outlet nozzle (16) are arranged on the same side outside the shell (10);

Or the liquid inlet nozzle (15) and the liquid outlet nozzle (16) are arranged at two sides of the outer part of the shell (10).