Vehicle-mounted charger

Abstract

The utility model provides a vehicle-mounted charger, which comprises a shell, the top of the shell is provided with an opening, and a control circuit board is arranged at the opening; a cooling liquid flow channel is arranged inside the shell, and 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 at the position, located on the outer side wall of the cooling liquid flow channel, in the shell, and multiple rows of patch switch tubes electrically connected with the control circuit board are arranged on the metal substrate; partition plates matched with the side portions of the shell to define a filtering cavity are arranged on the two sides of the cooling liquid flow channel in the shell, a filtering module electrically connected with the control circuit board is arranged in the filtering cavity, and each partition plate comprises an isolation part located between the filtering module and the metal substrate. According to the vehicle-mounted charger provided by the utility model, the independently designed filtering module and the metal substrate provided with the patch switch tube are adopted, so that signal interference between the filtering module and the metal substrate is reduced, effective separation and shielding are achieved, the product size is reduced, and the heat dissipation effect is improved.

Description

Technical Field

[0001] The utility model belongs to the field of automobile charging, and more specifically, relates to a vehicle-mounted charger. Background Art

[0002] With the demand for energy conservation, emission reduction and air pollution control, new energy vehicles are gradually being commercialized in the market, and electric vehicles are the main force of new energy vehicles. Among them, the on-board charger (OBC) is an important component of electric vehicles.

[0003] At present, the pursuit of lightweight automotive parts is the goal pursued by the industry, and the size of on-board chargers has gradually decreased. Since a large number of circuit components are integrated inside the on-board charger, there is still room for optimization in the installation structure and method of these circuit components. In addition, existing on-board chargers usually also include filters, which will generate electromagnetic interference to other electronic components in the on-board charger, which is not conducive to the stable operation of the on-board charger. Utility Model Content

[0004] In order to solve the above defects in the prior art, the utility model proposes a vehicle-mounted charger.

[0005] The technical solution adopted by the utility model is: to provide a vehicle-mounted charger, comprising: a shell, the top of the shell is set to be open, and a control circuit board is arranged at the open position;

[0006] A coolant flow channel is provided inside the shell;

[0007] A metal substrate is provided on the outer side wall of the coolant flow channel inside the housing, and a plurality of rows of surface mount switch tubes electrically connected to the control circuit board are provided on the metal substrate;

[0008] The shell has a partition inside which cooperates with the shell side to form a filter cavity. The filter cavity has a filter module electrically connected to the control circuit board. The partition includes an insulating portion located between the filter module and the metal substrate.

[0009] Furthermore, the filter module comprises a filter circuit board parallel to the control circuit board, a connector electrically connected to the control circuit board is provided on one side of the filter circuit board, and a filter element is provided on the other side of the filter circuit board.

[0010] Furthermore, the filter module also includes a shielding cover, which includes a top shielding portion and a side shielding portion extending vertically from a side edge of the top shielding portion, the top shielding portion is arranged between the filter circuit board and the control circuit board, and the side shielding portion is arranged between the filter module and the shell and / or the partition.

[0011] Furthermore, the filter module further includes an insulating cover, and the insulating cover includes a top insulating portion provided between the top shielding portion and the control circuit board.

[0012] Furthermore, a first heat-conducting material is provided in the filter cavity for filling a gap between the filter module and the shell or the partition.

[0013] Furthermore, the metal substrate is fixed to the outer side wall of the flow channel by welding, gluing or screwing;

[0014] A second heat conducting material is disposed between the metal substrate and the outer side wall of the flow channel.

[0015] Furthermore, a connection between the outer side wall of the flow channel and the bottom of the shell is configured as an arc-shaped step surface or as a right angle.

[0016] Furthermore, a connection between the outer side wall of the flow channel and the bottom of the shell is arranged as an arc-shaped step surface, and the bottom of the metal substrate is provided with an inclined surface corresponding to the arc-shaped step surface.

[0017] Furthermore, a liquid inlet nozzle and a liquid outlet nozzle which are in flow communication with the coolant are provided outside the shell.

[0018] Furthermore, the cooling liquid flow channel includes a first side flow channel and a second side flow channel arranged at intervals, and a switching flow channel connecting the first side flow channel and the second side flow channel, the liquid inlet end of the first side flow channel is connected to the liquid inlet nozzle, and the liquid outlet end of the second side flow channel is connected to the liquid outlet nozzle.

[0019] Furthermore, the coolant flow channel further comprises a flat flow channel, and the flat flow channel is connected with the first side flow channel and the second side flow channel;

[0020] The flat flow channel is also communicated with the transfer flow channel.

[0021] Furthermore, the inner side walls of the first side flow channel, the second side flow channel and the transfer flow channel cooperate with the bottom of the shell to form a built-in cavity, and a magnetic device electrically connected to the control circuit board is provided in the built-in cavity.

[0022] Furthermore, a third heat-conducting material is provided in the built-in cavity for filling a gap between the magnetic device and an inner wall of the flow channel.

[0023] Furthermore, heat dissipation fins are provided at the inner bottom of the built-in cavity.

[0024] Furthermore, the liquid inlet nozzle and the liquid outlet nozzle are arranged on the same side of the exterior of the housing;

[0025] Alternatively, the liquid inlet nozzle and the liquid outlet nozzle are arranged on two sides of the exterior of the shell.

[0026] Compared with the prior art, the vehicle-mounted charger provided by the utility model has the following beneficial effects:

[0027] 1. An independently designed filter module is used to isolate it from the control part, and the filter module is placed in the filter cavity on both sides of the coolant flow channel to ensure good EMC effect and improve heat dissipation effect.

[0028] 2. Use a metal substrate with a patch switch tube, and place the metal substrate on the outer wall of the coolant flow channel, effectively utilize the three-dimensional space inside the shell, reduce the product volume, and improve the heat dissipation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0030] Figure 1 An overall exploded schematic diagram of a vehicle-mounted charger provided in an embodiment of the utility model;

[0031] Figure 2 A schematic diagram of the overall structure of a vehicle charger provided in an embodiment of the utility model;

[0032] Figure 3 Schematic diagram of the layout of the water inlet and outlet nozzles of the on-board charger provided in the embodiment of the utility model Figure 1 ;

[0033] Figure 4 Schematic diagram of the layout of the water inlet and outlet nozzles of the on-board charger provided in the embodiment of the utility model Figure 2 ;

[0034] Figure 5 Schematic diagram of the layout of the water inlet and outlet nozzles of the on-board charger provided in the embodiment of the utility model Figure 3 ;

[0035] Figure 6 for Figure 5 Bottom transverse section of

[0036] Figure 7 for Figure 5 lateral longitudinal section of

[0037] Figure 8An exploded schematic diagram of the assembly of the metal substrate and the coolant channel provided by the embodiment of the utility model;

[0038] Fig. 9 A cross-sectional view of the filter module, magnetic device, metal substrate and control circuit board provided in an embodiment of the utility model when connected;

[0039] Fig.10 A schematic diagram of the three-dimensional structure of a first filter module provided in an embodiment of the utility model;

[0040] Fig.11 A side view of a first filter module provided in an embodiment of the utility model;

[0041] Fig.12 A top view of a first filter module provided in an embodiment of the utility model;

[0042] Fig.13 A schematic diagram of the three-dimensional structure of a second filter module provided in an embodiment of the utility model;

[0043] Fig.14 A side view of a second filter module provided by an embodiment of the utility model;

[0044] Fig.15 A top view of a second filter module provided in an embodiment of the utility model;

[0045] Among them, the main marks of the drawings in the figure are:

[0046] 10. Shell; 11. First baffle; 12. Second baffle; 13. First filter cavity; 14. Second filter cavity; 15. Liquid inlet nozzle; 16. Liquid outlet nozzle; 17. Arc-shaped step surface; 18. Built-in cavity; 19. Heat dissipation fins;

[0047] 20. Coolant flow channel; 21. First side flow channel; 22. Second side flow channel; 23. Transfer flow channel; 24. Second heat conductive material; 25. Flat flow channel; 251. First flat flow channel portion; 252. Second flat flow channel portion; 253. Separator strip;

[0048] 30. Metal substrate; 31. SMD switch tube; 32. Terminal; 33. Inclined surface;

[0049] 41. a first magnetic device; 42. a second magnetic device;

[0050] 50, first filter module; 51, first filter circuit board; 52, first power connector; 53, first signal connector; 54, first filter device; 55, first shielding cover; 551, first top shielding part; 552, second side shielding part; 56, first mounting part; 57, first insulating cover; 571, first top insulating part; 572, first side insulating part;

[0051] 60, second filter module; 61, second filter circuit board; 62, second power connector; 63, second signal connector; 64, second filter device; 65, second shielding cover; 651, second top shielding portion; 652, second side shielding portion; 66, second mounting portion; 67, second insulating cover; 671, second insulating cover; 672, second top insulating portion;

[0052] 70. Control circuit board;

[0053] 80. S-shaped bend. DETAILED DESCRIPTION

[0054] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0055] See also Figure 1 , Figure 2 The vehicle charger provided by the utility model includes a housing 10 and a coolant flow channel 20, a metal substrate 30, a filter module and a magnetic device arranged inside the housing 10.

[0056] like Figure 1 , Fig. 9 As shown, the housing 10 is provided with a containing space inside for placing the coolant flow channel 20, the metal substrate 30 and the filter module, etc. The top of the housing 10 is provided with an opening, and a control circuit board 70 is provided at the opening. The housing 10 is provided with a liquid inlet nozzle 15 and a liquid outlet nozzle 16 connected to the coolant flow channel 20 on the outside.

[0057] It should be noted that the present invention does not limit the layout of the liquid inlet nozzle 15 and the liquid outlet nozzle 16, and the specific positions of the liquid inlet nozzle 15 and the liquid outlet nozzle 16 can be flexibly set according to actual needs. Now, several specific examples are provided, such as Figure 3 As shown, the liquid inlet nozzle 15 and the liquid outlet nozzle 16 are arranged on opposite sides of the exterior of the housing 10. Figure 4 As shown, the liquid inlet nozzle 15 and the liquid outlet nozzle 16 are arranged on the rear side of the housing 10. Figure 5 As shown, the liquid inlet nozzle 15 and the liquid outlet nozzle 16 are arranged on the front side of the exterior of the housing 10. The following description is based on an example that the liquid inlet nozzle 15 and the liquid outlet nozzle 16 are arranged on the front side of the exterior of the housing 10.

[0058] like Figure 6As shown, the coolant channel 20 is arranged in the middle area inside the shell 10. The coolant channel 20 includes a first side channel 21 and a second side channel 22 arranged at intervals, and a switching channel 23 connecting the first side channel 21 and the second side channel 22. The liquid inlet end of the first side channel 21 is connected to the liquid inlet nozzle 15, and the liquid outlet end of the second side channel 22 is connected to the liquid outlet nozzle 16. The coolant enters from the liquid inlet nozzle 15, passes through the first side channel 21, the switching channel 23 and the second side channel 22 in sequence, and then flows out through the liquid outlet nozzle 16. In this process, the coolant can take away the heat generated by the heating device inside the shell 10, thereby realizing the heat dissipation of the on-board charger.

[0059] like Figure 7 , Figure 8 , Fig. 9 As shown, in order to better improve the heat dissipation effect of the on-board charger, the coolant flow channel 20 also includes a flat flow channel 25, which is connected to the first side flow channel 21 and the second side flow channel 22, and the flat flow channel 25 is also connected to the transfer flow channel 23. The utility model can achieve bottom heat dissipation by adding the flat flow channel 25, increase the heat dissipation area, and thus improve the heat dissipation effect.

[0060] like Fig. 9 As shown, the flat flow channel 25 includes a first flat flow channel portion 251 and a second flat flow channel portion 252, and a dividing strip 253 for separating the first flat flow channel portion 251 from the second flat flow channel portion 252. It should be understood that the extension direction of the dividing strip 253 is consistent with the extension direction of the first side flow channel 21 and the second side flow channel 22. The end of the first flat flow channel portion 251 away from the liquid inlet nozzle 15 is connected to the transfer flow channel 23, and the end of the second flat flow channel portion 252 away from the liquid outlet nozzle 16 is connected to the transfer flow channel 23. At the same time, the side of the first flat flow channel portion 251 away from the dividing strip 253 is connected to the first side flow channel 21, and the side of the second flat flow channel portion 252 away from the dividing strip 253 is connected to the second side flow channel 22. The coolant enters from the liquid inlet nozzle 15 , first passes through the first side flow channel 21 and the first flat flow channel portion 251 , then passes through the transfer flow channel 23 , then passes through the second side flow channel 22 and the second flat flow channel portion 252 , and finally flows out through the liquid outlet nozzle 16 .

[0061] like Figure 8 , Fig. 9As shown, the metal substrate 30 is arranged on the outer wall of the coolant flow channel 20, and the metal substrate 30 is perpendicular to the control circuit board 70, and the metal substrate 30 is provided with multiple rows of patch switch tubes 31 electrically connected to the control circuit board 70. Compared with the existing scheme, the utility model adopts a metal substrate 30 provided with multiple rows of patch switch tubes 31 to replace the plug-in switch tube, and the metal substrate 30 is perpendicular to the control circuit board 70, which not only effectively utilizes the three-dimensional space, reduces the length and width of the power converter, and provides the power density per unit space, but also facilitates the heat exchange between the switch tube and the metal substrate 30 and the coolant in the coolant flow channel 20, thereby improving the heat dissipation effect of the on-board charger.

[0062] There are many ways to connect the metal substrate 30 and the outer wall of the flow channel in the present invention. For example, the metal substrate 30 is fixed to the outer wall of the flow channel by welding, gluing or screwing.

[0063] In one example, the metal substrate 30 is fixed to the outer wall of the flow channel by welding. Solder with good thermal conductivity is used to fill the gap between the metal substrate 30 and the outer wall of the flow channel, which can not only play a role in connection and fixing, but also reduce contact thermal resistance.

[0064] In another example, the metal substrate 30 is fixed to the outer wall of the flow channel by adhesive connection. The gap between the metal substrate 30 and the outer wall of the flow channel is filled with thermally conductive silicone, which can not only play a role in connection and fixing, but also reduce contact thermal resistance.

[0065] In another example, the metal substrate 30 is fixed to the outer wall of the flow channel by screw connection. The gap between the metal substrate 30 and the outer wall of the flow channel is filled with a thermal interface material (i.e., a TIM material) to reduce the contact thermal resistance, and the metal substrate 30 is fixedly connected to the outer wall of the flow channel by bolts.

[0066] like Figure 8 As shown, two rows of patch switch tubes 31 are provided on the metal substrate 30, each row includes two patch switch tubes 31, and the top of the metal substrate 30 is provided with a terminal 32 for electrical connection with the control circuit board 70. Of course, in other embodiments, the number of rows of patch switch tubes 31 and the number of patch switch tubes in each row can be set as needed.

[0067] In order to improve the heat conduction effect of the metal substrate 30, a second heat conducting material 24 is provided between the metal substrate 30 and the outer wall of the coolant channel 20. Preferably, the second heat conducting material 24 can be heat conducting silica gel or heat conducting silicone grease.

[0068] In addition, the connection between the outer 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 close to the bottom of the shell 10) is provided with an inclined surface 33 corresponding to the arc-shaped step surface 17. This design can reduce the gap between the metal substrate 30 and the bottom of the shell 10, which is beneficial to the utilization of space and reduces the volume of the product.

[0069] Of course, in other examples, the connection between the outer wall of the flow channel and the bottom of the shell 10 can also be set to a right angle, and correspondingly, the bottom of the metal substrate 30 (that is, the side of the metal substrate 30 close to the bottom of the shell 10) is set to 90 degrees.

[0070] like Fig. 9 As shown, the outer wall of the coolant channel 20 includes the outer wall of the first side channel 21 and the outer wall of the second side channel 22. A metal substrate 30 is provided on both the outer wall of the first side channel 21 and the outer wall of the second side channel 22. The metal substrate 30 located on the side of the first side channel 21 and the metal substrate 30 located on the side of the second side channel 22 can be provided with different types of patch switch tubes 31, and the shapes of different types of patch switch tubes 31 are different. In addition, near the metal substrate 30 located on the side of the second side channel 22, an S-shaped bend 80 for grounding is provided on the housing 10, and the S-shaped bend 80 is connected to the housing 10 by bolts.

[0071] like Figure 1 , Figure 6 , Figure 7 , Fig. 9 As shown, the inner side walls of the first side channel 21, the second side channel 22 and the transfer channel 23 cooperate to form a built-in cavity 18, and a magnetic device electrically connected to the control circuit board 70 is provided in the built-in cavity. This design is not only conducive to heat exchange between the magnetic device and the coolant in the coolant channel 20, but also can effectively separate the magnetic device from other devices inside the housing 10. The magnetic device includes different types of first magnetic devices 41 and second magnetic devices 42, and the shapes of different types of magnetic devices are different.

[0072] In order to better improve the heat conduction effect of the magnetic device, a third heat conducting material for filling the gap between the magnetic device and the inner wall of the flow channel is provided in the built-in cavity 18. Preferably, the third heat conducting material can be heat conducting silica gel or heat conducting silicone grease.

[0073] In addition, if Figure 7 As shown, a heat dissipation fin 19 is also provided at the bottom of the built-in cavity 18 to increase the contact area between the magnetic device and the coolant flow channel 20, which is more conducive to the heat dissipation of the magnetic device. The heat dissipation fin 19 can be any one of a toothed fin, a cylindrical fin and a rectangular fin.

[0074] like Figure 1 , Figure 5 , Fig. 9 As shown, a partition is provided inside the housing 10 and cooperates with the side of the housing 10 to form a filter cavity. A filter module electrically connected to the control circuit board 70 is provided inside the filter cavity. The partition includes an insulating portion located between the filter module and the metal substrate 30. This design can separate different filter modules and the metal substrate 30 to ensure that the filter module has good electromagnetic shielding performance. In order to better improve the thermal conduction effect of the magnetic device, a first thermal conductive material is provided in the filter cavity to fill the gap between the filter module and the housing 10 or the partition. Preferably, the first thermal conductive material can be thermal conductive silica gel or thermal conductive silicone grease.

[0075] The filter module includes a filter circuit board, an insulating cover and an insulating cover. The filter circuit board is parallel to the control circuit board 70, and a connector electrically connected to the control circuit board 70 is provided on one side of the filter circuit board, which includes a power connector and a signal connector, and a filter device is provided on the other side of the filter circuit board. The shielding cover includes a top shielding portion and a side shielding portion extending vertically from the side edge of the top shielding portion, the top shielding portion is arranged between the filter circuit board and the control circuit board 70, and the side shielding portion is arranged between the filter module and the housing 10 and / or the partition. By arranging the shielding cover, external radiation can be reduced. The insulating cover includes a top insulating portion arranged between the top shielding portion and the control circuit board 70, and the top insulating portion is arranged between the top shielding portion and the control circuit board 70. The insulation performance between adjacent circuit boards can be guaranteed by arranging the insulating cover.

[0076] like Figure 1 As shown, the filter module includes different types of first filter modules 50 and second filter modules 60, and the shapes of the different types of filter modules are different. The specific structures of the first filter module 50 and the second filter module 60 are described below.

[0077] like Fig.10 , Fig.11 , Fig.12As shown, the first filter module 50 is an input AC filter. The first filter module 50 includes a first filter circuit board 51, a first shielding cover 55 and a first insulating cover 57. Among them, a first power connector 52 and two first signal connectors 53 are provided on one side of the first filter circuit board 51, and a plurality of first filter components 54 are provided on the other side of the first filter circuit board 51. The plurality of first filter components 54 include varistors, common-mode inductors and capacitors. The first shielding cover 55 includes an integrally formed first top shielding portion 551 and a plurality of first side shielding portions. The first top shielding portion 551 is also provided with a plurality of first mounting portions 56 for fixing the entire shielding cover on the first filter circuit board 51 and grounding. The first insulating cover 57 includes an integrally formed first top insulating portion 571 and a first side insulating portion 572. The first top insulating portion 571 is provided on the first top shielding portion 551, and the first side insulating portion 572 is on the same side as a first side shielding portion.

[0078] like Fig.13 , Fig.14 , Fig.15 As shown, the second filter module 60 is an output end HV filter, and the second filter module 60 includes a second filter circuit board 61, a second shielding cover 65 and a second insulating cover 671. Among them, a second power connector 62 and a second signal connector 63 electrically connected to the control circuit board 70 are provided on one side of the second filter circuit board 61, and a plurality of second filter components 64 are provided on the other side of the second filter circuit board 61. The plurality of second filter components 64 include varistors, common mode inductors and capacitors. The second shielding cover 65 includes an integrally formed second top shielding portion 651 and a second side shielding portion 652, and a plurality of second mounting portions 66 are provided on the second top shielding portion 651 to fix the entire shielding cover on the second filter circuit board 61 and perform grounding. The second insulating cover 671 is a second top insulating portion 672 provided on the second top shielding portion 651.

[0079] like Figure 1 , Figure 2 , Figure 5 As shown, a first partition plate 11 and a second partition plate 12 are provided inside the housing 10. The first partition plate 11 and the housing 10 cooperate to form a first filter cavity 13, and the second partition plate 12 and the housing 10 cooperate 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.

[0080] The vehicle charger provided by the utility model adopts an independently designed filter module and a metal substrate with a patch switch tube to reduce signal interference between each other and achieve effective separation and shielding. At the same time, the filter module and the metal substrate are arranged on the outside of the coolant flow channel, and the magnetic device is arranged on the inside of the coolant flow channel to ensure that the heating device in the housing quickly exchanges heat with the coolant flow channel, effectively improving the heat dissipation effect of the vehicle charger.

[0081] On the one hand, the input AC filter and the output HV filter are separated from the control part to form an independently designed filter module. The filter module is provided with a shielding cover and an insulating cover, and an interface and an interactive interface electrically connected to the control circuit board are reserved. A filter cavity is provided on both sides of the coolant flow channel inside the shell, and the filter module is placed in the filter cavity, thereby ensuring that the filter module has good EMC effect and heat dissipation effect.

[0082] On the other hand, a metal substrate with a surface-mount switch tube is used to replace the plug-in switch tube. The metal substrate is arranged vertically to the control circuit board, and the metal substrate is installed on the outer side wall of the coolant flow channel. A 45-degree slope is provided at the joint between the metal substrate and the bottom of the shell, which makes full use of the three-dimensional space inside the shell, reduces the volume by 30%, and ensures the heat dissipation effect of the metal substrate.

[0083] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A vehicle-mounted charger, characterized in that: include: A housing (10), wherein the top of the housing (10) is arranged to be open, and a control circuit board (70) is arranged at the open position; A cooling liquid flow channel (20) is provided inside the housing (10); A metal substrate (30) is provided on the outer side wall of the coolant flow channel (20) inside the housing (10), and a plurality of rows of surface mount switch tubes (31) electrically connected to the control circuit board (70) are provided on the metal substrate (30); A partition is provided inside the shell (10) and cooperates with the side of the shell (10) to form a filter cavity. A filter module electrically connected to the control circuit board (70) is provided inside the filter cavity. The partition includes an insulating portion located between the filter module and the metal substrate (30).

2. The vehicle-mounted charger according to claim 1, characterized in that: 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 connector electrically connected to the control circuit board (70), and the other side of the filter circuit board is provided with a filter element.

3. The vehicle-mounted charger according to claim 2, characterized in that: The filter module further comprises a shielding cover, the shielding cover comprising a top shielding portion and a side shielding portion extending vertically from a side edge of the top shielding portion, the top shielding portion being arranged between the filter circuit board and the control circuit board (70), and the side shielding portion being arranged between the filter module and the housing (10) and / or the partition.

4. The vehicle-mounted charger according to claim 3, characterized in that: The filter module further comprises an insulating cover, wherein the insulating cover comprises a top insulating portion arranged between the top shielding portion and the control circuit board (70).

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

6. The vehicle-mounted charger according to claim 1, characterized in that: The metal substrate (30) is fixed to the outer wall of the flow channel by welding, gluing or screwing; A second heat-conducting material (24) is provided between the metal substrate (30) and the outer wall of the flow channel.

7. The vehicle-mounted charger according to claim 1, characterized in that: The connection between the outer side wall of the flow channel and the bottom of the shell (10) is arranged as an arc-shaped step surface (17) or as a right angle.

8. The vehicle-mounted charger according to claim 7, characterized in that: The connection between the outer side wall of the flow channel and the bottom of the shell (10) is arranged as an arc-shaped step surface (17), and the bottom of the metal substrate (30) is provided with an inclined surface (33) corresponding to the arc-shaped step surface (17).

9. The vehicle-mounted charger according to claim 1, characterized in that: A liquid inlet nozzle (15) and a liquid outlet nozzle (16) which are in communication with the cooling liquid flow channel are provided outside the housing (10).

10. The vehicle-mounted charger according to claim 9, characterized in that: 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 switching flow channel (23) connecting the first side flow channel (21) and the second side flow channel (22); the liquid inlet end of the first side flow channel (21) is connected to the liquid inlet nozzle (15), and the liquid outlet end of the second side flow channel (22) is connected to the liquid outlet nozzle (16).

11. The vehicle-mounted charger according to claim 10, characterized in that: The coolant flow channel (20) further comprises a flat flow channel (25), wherein the flat flow channel (25) is in communication with the first side flow channel (21) and the second side flow channel (22); The flat flow channel (25) is also connected to the switching flow channel (23).

12. The vehicle-mounted charger according to claim 10, characterized in that: The inner side walls of the first side flow channel (21), the second side flow channel (22) and the transfer flow channel (23) cooperate to form a built-in cavity (18), and a magnetic device electrically connected to the control circuit board (70) is provided in the built-in cavity (18).

13. The vehicle-mounted charger according to claim 12, characterized in that: The built-in cavity (18) is provided with a third heat-conducting material for filling the gap between the magnetic device and the inner wall of the flow channel.

14. The vehicle-mounted charger according to claim 13, characterized in that: The inner bottom of the built-in cavity (18) is provided with heat dissipation fins (19).

15. The vehicle-mounted charger according to claim 9, characterized in that: The liquid inlet nozzle (15) and the liquid outlet nozzle (16) are arranged on the same side of the exterior of the housing (10); Alternatively, the liquid inlet nozzle (15) and the liquid outlet nozzle (16) are arranged on two sides of the outside of the shell (10).

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