Vehicle-mounted charger heat dissipation structure

Abstract

The utility model provides a heat dissipation structure of a vehicle-mounted charger, which comprises a shell with an inner cavity provided with a plane water channel, the inner cavity is provided with a three-dimensional water channel communicated with the plane water channel, and the inner cavity is divided into a plurality of heat dissipation chambers connected with the plane water channel and the three-dimensional water channel; the plurality of functional modules are respectively arranged in the heat dissipation chambers; the heat dissipation structure is arranged in the inner cavity and is communicated with the three-dimensional water channel through an internal flow channel; the power module is connected to the heat dissipation structure. The vehicle-mounted charger heat dissipation structure provided by the utility model is simple in layout and assembly process, the power module and the bridge arm heat dissipation structure are connected with the three-dimensional water channel in a manner that screws are matched with sealing rings or sealants, the power module is supported to be quickly disassembled and assembled, and the production efficiency is improved; the space for installing a three-dimensional water channel in the shell is saved, the installation space of a plane water channel for heat dissipation of other functional modules is improved, and full heat dissipation of all modules of the whole machine is facilitated; protruding or fin structures are arranged in the plane water channels and the bridge arm heat dissipation structures so as to increase the heat exchange contact area, and the heat dissipation efficiency and the power density of the power module are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle-mounted chargers, in particular to a heat dissipation structure of a vehicle-mounted charger. Background Art

[0002] An on-board charger (OBC) is a charger installed in electric vehicles. As a crucial component of the vehicle's charging system, it rectifies AC power into DC power to charge the power battery and converts the battery's DC output into AC power for external devices. As battery capacity and charging power continue to increase, higher requirements are placed on the heat dissipation performance of each unit module within the OBC.

[0003] At present, the integrated heat dissipation solutions for OBC power modules and other functional modules provided by the industry usually directly disperse the discrete power devices on the surface of the three-dimensional water channel through an aluminum substrate, apply thermal interface material (TIM) between the aluminum substrate and the shell, and use pressure strips to press or glue them to the shell. This heat dissipation structure layout and assembly process are complicated, resulting in reduced production efficiency of the on-board charger, and inconvenient disassembly, maintenance, upgrading and updating of the power module. In addition, this heat dissipation layout causes the discrete power devices and three-dimensional water channels to occupy a large amount of storage space in the OBC casing, which reduces the space in the OBC casing for installing planar water channels for heat dissipation of other functional modules, which is not conducive to sufficient heat dissipation of each OBC module. Utility Model Content

[0004] The utility model provides a heat dissipation structure of an on-board charger, so as to solve the technical problem of complex assembly of the heat dissipation structure of the power module of the existing on-board charger.

[0005] In order to solve the above problems, the technical solution adopted by the present invention is:

[0006] The utility model provides a heat dissipation structure of a vehicle-mounted charger, comprising:

[0007] The shell has an inner cavity provided with a planar water channel, an inner cavity provided with a three-dimensional water channel communicating with the planar water channel, and the inner cavity is divided into a plurality of heat dissipation chambers connected to the planar water channel and / or the three-dimensional water channel;

[0008] Multiple functional modules are placed in various heat dissipation chambers;

[0009] The heat dissipation structure is arranged in the inner cavity and is connected to the three-dimensional water channel through its internal flow channel;

[0010] At least one power module is connected to the heat dissipation structure.

[0011] Preferably, the power module is connected to the heat dissipation structure through a heat conductive structure layer.

[0012] Preferably, the heat-conducting structural layer is a thermal interface material layer, a heat-conducting adhesive layer or a solder layer.

[0013] Furthermore, the on-board charger heat dissipation structure also includes:

[0014] The waterway inlet and the waterway outlet are arranged on the shell at intervals;

[0015] The three-dimensional waterway includes:

[0016] A first vertical water channel and a second vertical water channel are arranged at one end of the inner cavity at intervals;

[0017] Plane waterways include:

[0018] The first longitudinal water channel and the second longitudinal water channel are spaced apart on both sides of the bottom of the shell and are respectively connected to the water channel inlet, the first vertical water channel, the water channel outlet, and the second vertical water channel;

[0019] The internal flow channel is connected between the first vertical water channel and the second vertical water channel.

[0020] Preferably, the first longitudinal water channel and the second longitudinal water channel are connected to the bottom water inlet of the first vertical water channel and the bottom water outlet of the second vertical water channel respectively;

[0021] The heat dissipation structure includes:

[0022] a bridge arm body, wherein an internal flow channel is provided;

[0023] The water inlet joint and the water outlet joint are spaced apart at the two ends of the bottom of the bridge arm body. The water inlet joint and the water outlet joint are respectively provided with water inlet holes and water outlet holes. The water inlet holes and the water outlet holes are respectively connected between the water inlet end of the internal flow channel and the top water outlet of the first vertical water channel, and between the water outlet end of the internal flow channel and the top water inlet of the second vertical water channel.

[0024] Furthermore, a left water channel groove and a right water channel groove are arranged at intervals on the outer surface of the bottom wall of the shell facing away from the inner cavity, the left water inlet end of the left water channel groove and the right water outlet end of the right water channel groove respectively correspondingly connect to the water channel inlet and the water channel outlet, the left water outlet end of the left water channel groove and the right water inlet end of the right water channel groove respectively extend to the end of the bottom wall opposite to the water channel inlet and the water channel outlet; a plurality of heat dissipation protrusions are arranged at intervals on the left water channel groove and the right water channel groove;

[0025] The on-board charger heat dissipation structure also includes:

[0026] The water channel cover plate is sealed and connected to the outer surface of the bottom wall, and respectively forms a first longitudinal water channel and a second longitudinal water channel with the left water channel groove and the right water channel groove.

[0027] Preferably, the first water channel column and the second water channel column are spaced apart at one end of the inner surface of the bottom wall facing the inner cavity relative to the water channel inlet and the water channel outlet, and the hollow interiors of the first water channel column and the second water channel column respectively form a vertically extending first vertical water channel and a second vertical water channel, the bottom water inlet and the bottom water outlet are respectively connected to the left water outlet end and the right water inlet end, and the top water outlet and the top water inlet are respectively arranged on the top surfaces of the first water channel column and the second water channel column.

[0028] Preferably, a first installation step surrounding the first vertical water channel is formed at the connection between the top water outlet and the top surface of the first water channel column, and a first sealing groove surrounding the first vertical water channel is provided on the bottom surface of the first installation step, and a first sealing ring is embedded in the first sealing groove;

[0029] A second installation step surrounding the second vertical water channel is formed at the connection between the top water inlet and the top surface of the second water channel column. A second sealing groove surrounding the second vertical water channel is provided on the bottom surface of the second installation step, and a second sealing ring is embedded in the second sealing groove.

[0030] The water inlet joint is installed on the first installation step, and the water inlet hole is connected to the top water outlet, and the end of the water inlet joint is pressed against the first sealing ring;

[0031] The water outlet joint is installed on the second installation step, and the water outlet hole is connected to the top water inlet, and the end of the water outlet joint presses the second sealing ring.

[0032] Preferably, the outer side surface of the water inlet joint is provided with a third sealing groove surrounding the circumference thereof, and a third sealing ring is embedded in the third sealing groove;

[0033] The outer side surface of the water outlet joint is provided with a fourth sealing groove surrounding the circumference thereof, and a fourth sealing ring is embedded in the fourth sealing groove;

[0034] When the water inlet joint is installed on the first installation step, the inner side surface of the first installation step presses the third sealing ring;

[0035] When the water outlet joint is installed on the second installation step, the inner side surface of the second installation step presses the fourth sealing ring.

[0036] Preferably, the bridge arm body includes:

[0037] The heat dissipation base plate has water inlet joints and water outlet joints spaced at both ends of the bottom of the heat dissipation base plate, and the water inlet holes and the water outlet holes correspond to the two ends of the top surface of the heat dissipation base plate respectively;

[0038] A heat dissipation top plate is provided with a flow channel groove on its bottom surface facing the heat dissipation bottom plate, with both ends of the flow channel groove extending to cover the water inlet and outlet holes respectively; a plurality of heat dissipation fins are arranged at intervals in the flow channel groove;

[0039] The heat dissipation top plate and the heat dissipation bottom plate are connected up and down to form a bridge arm body, and the heat dissipation bottom plate and the flow channel groove form an internal flow channel;

[0040] The power module is connected to the top surface of the heat dissipation top plate facing away from the heat dissipation bottom plate through a heat conduction structure layer.

[0041] Preferably, the power module is connected to the top surface of the heat dissipation top plate facing away from the heat dissipation bottom plate through a heat conductive structure layer.

[0042] Preferably, the functional modules include:

[0043] The first EMC unit, the second EMC unit, the first magnetic element unit, and the second magnetic element unit are respectively placed in the heat dissipation chamber connected to the planar water channel;

[0044] The filter unit is placed in a heat dissipation chamber connected to both the planar water channel and the three-dimensional water channel.

[0045] Furthermore, the top of the shell forms an opening communicating with the inner cavity, and the on-board charger heat dissipation structure further includes:

[0046] A top cover is installed over the opening to seal the inner cavity;

[0047] A circuit board is installed at the corresponding opening of the inner cavity and is located between the top of the heat dissipation chamber and the top cover. The circuit board is electrically connected to the power module and the functional module.

[0048] An insulating layer, with multiple insulating flanges spaced apart around the insulating layer, the insulating layer being padded between the top cover and the circuit board, and the insulating flanges extending into the inner cavity and being padded between the power module, the functional module and the housing.

[0049] Compared with the prior art, the present invention has the following beneficial effects:

[0050] The heat dissipation structure of the on-board charger provided by the utility model provides a heat dissipation structure layout in which a flat water channel is converted into a three-dimensional water channel, the water channel in the bridge arm heat dissipation structure is converted into a flat water channel, and the heat dissipation structure layout and assembly process are simple. The power module and the bridge arm heat dissipation structure are connected to the three-dimensional water channel of the shell by screws, sealing rings or sealants, which supports rapid disassembly and assembly and maintenance and upgrading of the power module, thereby improving the production efficiency of the OBC; at the same time, it saves the space for installing the three-dimensional water channel in the OBC shell, increases the installation space of the flat water channel for heat dissipation of other functional modules, and is conducive to sufficient heat dissipation of each OBC module; protrusions or fin heat dissipation structures can be respectively provided in the internal flow channels of the flat water channel and the bridge arm heat dissipation structure to increase the contact area with the coolant, thereby increasing The high convection heat transfer coefficient and low convection heat transfer thermal resistance improve the heat dissipation efficiency and power density of the power module. Planar water channels are used to dissipate heat for magnetic components, EMC and other functional modules, three-dimensional water channels are used to dissipate heat for the filter unit, and the bridge arm heat dissipation structure is used to dissipate heat for the power module, so as to achieve full heat dissipation for each functional module and power module in the OBC and improve the overall heat dissipation performance of the power module and each functional module. The power module is directly installed on the bridge arm heat dissipation structure by using thermal conductive structural layers such as TIM materials, thermosetting adhesives and solder, which can fill the air at its contact interface, reduce the contact thermal resistance and improve the heat dissipation performance, and its number can be increased or decreased according to actual needs. The insulation layer between the PCB board and the top cover uses hard insulating plastic to support automated production. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] In order to more clearly illustrate the technical solution proposed by the present invention, the present invention is described in detail below with reference to the embodiments and drawings. It should be understood that the embodiments and drawings described in the following specific embodiments and the drawings in the specification are merely some embodiments of the present invention, and those skilled in the art can modify these drawings under the concept of the present invention.

[0052] Figure 1 This is a schematic diagram of the overall exploded structure of an embodiment of the on-board charger heat dissipation structure provided by the utility model;

[0053] Figure 2 for Figure 1 Schematic diagram of the shell and planar water channel of the on-board charger heat dissipation structure from the bottom perspective;

[0054] Figure 3 for Figure 1 A schematic diagram of the top view of the housing and three-dimensional water channel of the on-board charger heat dissipation structure;

[0055] Figure 4 for Figure 1 Schematic diagram of the shell and the exploded structure of the heat dissipation structure of the on-board charger;

[0056] Figure 5 for Figure 3 A schematic diagram of a top view of the heat dissipation structure assembled in the shell and three-dimensional water channel;

[0057] Figure 6 for Figure 5 Schematic diagram of the cross-sectional structure of the shell, three-dimensional water channel and heat dissipation structure along the AA direction;

[0058] Figure 7 for Figure 6 Schematic diagram of the local enlarged structure of area B;

[0059] Figure 8 for Figure 4 Schematic diagram of the exploded structure of the heat dissipation structure;

[0060] Figure 9 for Figure 4 An exploded diagram of the connection structure between the power module and the heat dissipation structure;

[0061] Figure 10 for Figure 1 A schematic diagram showing a power module and heat dissipation structure being replaced with another connection structure;

[0062] Figure 11 for Figure 10 An exploded diagram of another connection structure between the power module and the heat dissipation structure;

[0063] Figure 12 for Figure 4 Schematic diagram of the assembly structure of the heat dissipation structure assembled with different numbers of power modules;

[0064] Figure 13 for Figure 8 A schematic diagram of the structure of the heat dissipation fins using rectangular fins from the bottom perspective of the heat dissipation top plate;

[0065] Figure 14 for Figure 8 A schematic diagram of the structure of the heat dissipation fins using diamond fins from the bottom perspective of the heat dissipation top plate;

[0066] Figure 15 for Figure 8 A schematic diagram of the structure of the heat dissipation fins using circular fins from the bottom perspective of the heat dissipation top plate;

[0067] Figure 16 for Figure 8 A schematic diagram of the structure of the heat dissipation fins using toothed fins from the bottom perspective of the heat dissipation top plate;

[0068] Figure 17 for Figure 2 Schematic diagram of the structure of the heat dissipation protrusion using heat dissipation fins.

[0069] Among them, the main marks of the drawings are as follows:

[0070] 1. Housing; 10. Connecting screws; 11. Inner cavity; 111. Partition wall; 112. Heat dissipation chamber; 113. Opening; 12. Bottom wall; 121. Left water channel groove; 1211. Left water inlet; 1212. Left water outlet; 122. Right water channel groove; 1221. Right water inlet; 1222. Right water outlet; 123. Heat dissipation protrusion; 13. Water channel cover; 14. First water channel column; 141. First installation step; 1411. First sealing groove; 14 2. First sealing ring; 15. Second waterway column; 151. Second mounting step; 1511. Second sealing groove; 152. Second sealing ring; 16. Mounting hole; 17. Top cover; 18. Pressing strip; 181. Welding foot; 2. Plane waterway; 21. First longitudinal waterway; 22. Second longitudinal waterway; 23. Waterway inlet; 24. Waterway outlet; 3. Three-dimensional waterway; 31. First vertical waterway; 311. Bottom water inlet; 312. Top water outlet; 32. Second Vertical water channel; 321, bottom water outlet; 322, top water inlet; 4, functional module; 41, first EMC unit; 42, second EMC unit; 43, first magnetic element unit; 44, second magnetic element unit; 45, filter unit; 5, heat dissipation structure; 50, internal flow channel; 51, bridge arm body; 511, heat dissipation bottom plate; 512, heat dissipation top plate; 5121, flow channel groove; 5122, fixing hole; 513, perforation; 514, heat dissipation fin; 51 41. Rectangular fin; 5142. Diamond fin; 5143. Circular fin; 5144. Serrated fin; 52. Water inlet connector; 521. Water inlet hole; 522. Third sealing groove; 5221. Third sealing ring; 53. Water outlet connector; 531. Water outlet hole; 532. Fourth sealing groove; 5321. Fourth sealing ring; 6. Power module; 61. Connection hole; 62. Thermal conductive structure layer; 7. Circuit board; 8. Insulation layer; 81. Insulation flange; 9. Plug-in module.

[0071] Among them, other marks in the figure are as follows:

[0072] X, first horizontal direction; Y, second horizontal direction; Z, vertical direction. DETAILED DESCRIPTION

[0073] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clear, the following is a summary of the technical problems, technical solutions and beneficial effects to be solved by the present invention. Figure 1-17 And embodiments, the utility model is further described in detail.

[0074] Please also refer to Figure 1-12 The heat dissipation structure of the vehicle charger provided by the utility model includes:

[0075] The shell 1 is preferably rectangular (cuboid), and the rectangular (cuboid) inner cavity 11 of the shell 1 is provided with a planar water channel 2; in this embodiment, the central axis direction of the shell 1 is set as the first horizontal direction X; one end of the inner cavity 11 in the first horizontal direction X is provided with a three-dimensional water channel 3 connected to the planar water channel 2, and the inner cavity 11 is divided into a plurality of heat dissipation chambers 112 connected to the planar water channel 2 and / or the three-dimensional water channel 3 by a plurality of criss-cross partition walls 111; a plurality of functional modules 4 are respectively fixedly arranged in each heat dissipation chamber 112; a heat dissipation structure 5 is placed at one end of the inner cavity 11 in the first horizontal direction X, and is connected to the three-dimensional water channel 3 through the internal flow channel 50 of the heat dissipation structure 5; at least one power module 6 is connected to the heat dissipation structure 5.

[0076] In another embodiment (not shown in the figure), the three-dimensional water channel 3 can also be arranged in the middle of the inner cavity 11 in the first horizontal direction X (that is, located between the two ends of the inner cavity 11 in the first horizontal direction X) and connected to the planar water channel 2.

[0077] In other embodiments, the central axis direction of the housing 1 may also be an inclined direction with an inclination angle.

[0078] In this embodiment, the power module 6 is connected to the heat dissipation structure 5 via a heat conductive structure layer 62 .

[0079] As a preferred implementation of this embodiment, the heat-conducting structure layer 62 is a thermal interface material layer, a heat-conducting adhesive layer or a solder layer. The specific connection method between the power module 6 and the heat dissipation structure 5 is described below.

[0080] In this embodiment, the internal chip of the power module 6 can be made of silicon, gallium nitride, silicon carbide or the like.

[0081] In this embodiment, the power module 6 may be in the form of a single-sided PIN pin or a double-sided PIN pin.

[0082] Please also refer to Figure 1-5 In this embodiment, the functional module 4 includes:

[0083] The first EMC unit 41, the second EMC unit 42, the first magnetic element unit 43 and the second magnetic element unit 44 are respectively fixedly arranged in the heat dissipation chamber 112 connected to the planar water channel 2, and are connected to the water channel wall of the planar water channel 2 through a heat conducting structure or directly; the filter unit 45 is fixedly arranged in the heat dissipation chamber 112 connected to the planar water channel 2 and the three-dimensional water channel 3 at the same time, and is connected to the water channel walls of the planar water channel 2 and the three-dimensional water channel 3 at the same time through a heat conducting structure or directly.

[0084] Please also refer to Figure 1-7In this embodiment, the on-board charger heat dissipation structure further includes: a water channel inlet 23 and a water channel outlet 24, which are spaced apart at one end of the housing 1 opposite to the three-dimensional water channel 3 in the first horizontal direction X, that is, the water channel inlet 23 and the water channel outlet 24 are spaced apart in a second horizontal direction Y perpendicular to the first horizontal direction X; the three-dimensional water channel 3 includes: a first vertical water channel 31 and a second vertical water channel 32 extending along the vertical direction Z, which are spaced apart at one end of the inner cavity 11 away from the water channel inlet 23 and the water channel outlet 24, that is, the first vertical water channel 31 and the second vertical water channel 32 are spaced apart in the second horizontal direction Y;

[0085] The planar water channel 2 includes: a first longitudinal water channel 21 and a second longitudinal water channel 22, which are spaced apart on both sides of the bottom of the shell 1 in the first horizontal direction X (that is, at the bottom on the left and right sides of the central axis of the shell 1), and respectively connect the water channel inlet 23, the first vertical water channel 31 and the water channel outlet 24, and the second vertical water channel 32; the internal flow channel 50 of the heat dissipation structure 5 is connected between the first vertical water channel 31 and the second vertical water channel 32.

[0086] In other embodiments (not shown in the figures), the water channel inlet 23 and the water channel outlet 24 may also be spaced apart and arranged at the same end of the shell 1 where the three-dimensional water channel 3 is arranged in the first horizontal direction X.

[0087] Please also refer to Figure 1-7 In this embodiment, the first longitudinal water channel 21 and the second longitudinal water channel 22 are respectively connected to the bottom water inlet 311 of the first vertical water channel 31 and the bottom water outlet 321 of the second vertical water channel 32; the heat dissipation structure 5 includes: a bridge arm body 51, which is extended along the second horizontal direction Y, and the bridge arm body 51 is provided with the above-mentioned internal flow channel 50 extending along the second horizontal direction Y; an inlet joint 52 and a water outlet joint 53, which are spaced apart at the bottom ends of the bridge arm body 51 in the second horizontal direction Y, and the inlet joint 52 and the outlet joint 53 are respectively provided with an inlet hole 521 and a water outlet hole 531, and the inlet hole 521 and the outlet hole 531 are respectively connected between the water inlet end of the internal flow channel 50 and the top water outlet 312 of the first vertical water channel 31, and between the water outlet end of the internal flow channel 50 and the top water inlet 322 of the second vertical water channel 32.

[0088] In other embodiments, the bridge arm body 51 may also extend along an inclined direction with an inclination angle or a horizontal direction that is not perpendicular to the first horizontal direction X.

[0089] Please also refer to Figure 1-7In this embodiment, a left water channel groove 121 and a right water channel groove 122 are provided on the outer surface of the bottom wall 12 of the shell 1 facing away from the inner cavity 11 in the second horizontal direction Y, and the left water channel groove 121 and the right water channel groove 122 extend approximately in the horizontal plane along the first horizontal direction X; the left water inlet end 1211 of the left water channel groove 121 and the right water outlet end 1222 of the right water channel groove 122 are connected to the water channel inlet 23 and the water channel outlet 24 respectively, and the left water outlet end 1212 of the left water channel groove 121 is connected to the water channel inlet 23 and the water channel outlet 24 respectively. The right water inlet end 1221 of the right water channel groove 122 extends respectively to one end of the bottom wall 12 in the first horizontal direction X opposite to the water channel inlet 23 and the water channel outlet 24; the left water channel groove 121 and the right water channel groove 122 are both provided with multiple heat dissipation protrusions 123 at intervals; the on-board charger heat dissipation structure also includes: a water channel cover plate 13, which is sealed and connected to the outer surface of the bottom wall 12, and respectively encloses the above-mentioned first longitudinal water channel 21 and the above-mentioned second longitudinal water channel 22 with the left water channel groove 121 and the right water channel groove 122.

[0090] See also Figure 2 As a preferred implementation of this embodiment, the heat dissipation protrusions 123 adopt various regular or irregular geometric shapes, and multiple heat dissipation protrusions 123 are irregularly spaced on the left water channel groove 121 and the right water channel groove 122.

[0091] See also Figure 17 In other embodiments, the heat dissipation protrusion 123 adopts regular or irregular heat dissipation fins of various geometric shapes, and multiple heat dissipation fins are arranged at intervals on the left water channel groove 121 and the right water channel groove 122 to achieve the best heat dissipation effect of the planar water channel.

[0092] In other embodiments, the first longitudinal water channel 21 and the second longitudinal water channel 22 may be designed with different flow areas, different water channel shapes, and different water channel depths to achieve the best heat dissipation effect of the planar water channel.

[0093] See also Figure 1 、 2 As a preferred implementation manner of this embodiment, welding, sealing ring or sealant is adopted between the waterway cover plate 13 and the outer surface of the bottom wall 12 of the shell 1 to fix the waterway cover plate 13 and the shell 1 as a whole, and the waterway cover plate 13 and the left waterway groove 121 and the right waterway groove 122 on the outer surface of the bottom wall 12 cooperate to form the above-mentioned first longitudinal waterway 21 and the above-mentioned second longitudinal waterway 22.

[0094] Please also refer to Figure 1-7In this embodiment, a hollow first water channel column 14 and a second water channel column 15 are arranged at intervals on the inner surface of the bottom wall 12 facing the inner cavity 11 at one end opposite to the water channel inlet 23 and the water channel outlet 24 in the first horizontal direction X. The hollow interiors of the first water channel column 14 and the second water channel column 15 respectively form the above-mentioned first vertical water channel 31 and the above-mentioned second vertical water channel 32 extending along the vertical direction Z. The bottom water inlet 311 of the above-mentioned first vertical water channel 31 and the bottom water outlet 321 of the second vertical water channel 32 are respectively connected to the left water outlet end 1212 of the left water channel groove 121 and the right water inlet end 1221 of the right water channel groove 122. The top water outlet 312 of the first vertical water channel 31 and the top water inlet 322 of the second vertical water channel 32 are respectively correspondingly arranged on the top surfaces of the first water channel column 14 and the second water channel column 15.

[0095] In other embodiments, the first vertical water channel 31 and the second vertical water channel 32 may also extend along an inclined direction intersecting the vertical direction Z.

[0096] Please also refer to Figure 4-7 In this embodiment, the connection between the top water outlet 312 of the first vertical water channel 31 and the top surface of the first water channel column 14 forms a first installation step 141 surrounding the first vertical water channel 31. The bottom surface of the first installation step 141 is provided with a first sealing groove 1411 surrounding the first vertical water channel 31. The first sealing ring 142 is embedded in the first sealing groove 1411.

[0097] A second mounting step 151 surrounding the second vertical water channel 32 is formed at the connection between the top water inlet 322 of the second vertical water channel 32 and the top surface of the second water channel column 15. The bottom surface of the second mounting step 151 is provided with a second sealing groove 1511 surrounding the second vertical water channel 32. A second sealing ring 152 is embedded in the second sealing groove 1511.

[0098] When the heat dissipation structure 5 is assembled with the shell 1, the water inlet connector 52 at one end of the bottom of the bridge arm body 51 of the heat dissipation structure 5 in the second horizontal direction Y is installed on the first installation step 141, and the water inlet hole 521 is connected to the top water outlet 312, and the end of the water inlet connector 52 is pressed against the first sealing ring 142; the water outlet connector 53 at the other end of the bottom of the bridge arm body 51 in the second horizontal direction Y is installed on the second installation step 151, and the water outlet hole 531 is connected to the top water inlet 322, and the end of the water outlet connector 53 is pressed against the second sealing ring 152.

[0099] Please also refer to Figure 4-9In this embodiment, a third sealing groove 522 is provided on the outer side surface of the water inlet joint 52 along its circumference, and a third sealing ring 5221 is embedded in the third sealing groove 522; a fourth sealing groove 532 is provided on the outer side surface of the water outlet joint 53 along its circumference, and a fourth sealing ring 5321 is embedded in the fourth sealing groove 532; when the water inlet joint 52 is installed on the first mounting step 141, the inner side surface of the first mounting step 141 presses the third sealing ring 5221; when the water outlet joint 53 is installed on the second mounting step 151, the inner side surface of the second mounting step 151 presses the fourth sealing ring 5321.

[0100] Please also refer to Figure 4-13 In this embodiment, the bridge arm body 51 includes:

[0101] The heat dissipation base plate 511 extends along the second horizontal direction Y. The water inlet connector 52 and the water outlet connector 53 are spaced apart at the two ends of the bottom of the heat dissipation base plate 511 on the second horizontal direction. The water inlet hole 521 of the water inlet connector 52 and the water outlet hole 531 of the water outlet connector 53 respectively pass through the two ends of the top surface of the heat dissipation base plate 511 on the second horizontal direction.

[0102] The heat dissipation top plate 512 extends along the second horizontal direction Y. A flow channel groove 5121 is formed on the bottom surface of the heat dissipation top plate 512 facing the heat dissipation bottom plate 511. The flow channel groove 5121 extends to positions covering the water inlet hole 521 and the water outlet hole 531 at both ends in the second horizontal direction Y. A plurality of heat dissipation fins 514 are spaced apart in the flow channel groove 5121.

[0103] The heat dissipation top plate 512 and the heat dissipation bottom plate 511 are connected up and down to form a bridge arm body 51 extending along the second horizontal direction Y, and the heat dissipation bottom plate 511 and the flow channel groove 5121 form the above-mentioned internal flow channel 50, and the two ends of the flow channel groove 5121 in the second horizontal direction Y respectively form the above-mentioned flow channel water inlet end and the above-mentioned flow channel water outlet end with the heat dissipation bottom plate 511, and at the same time, the water inlet hole 521 and the water outlet hole 531 are respectively connected to the flow channel water inlet end and the flow channel water outlet end.

[0104] See also Figure 13 In one implementation of this embodiment, the plurality of heat dissipation fins 514 spaced apart in the flow channel groove 5121 on the bottom surface of the heat dissipation top plate 512 are rectangular fins 5141 with a rectangular cross section.

[0105] See also Figure 14 In one implementation of this embodiment, the plurality of heat dissipation fins 514 spaced apart in the flow channel groove 5121 on the bottom surface of the heat dissipation top plate 512 are diamond-shaped fins 5142 having a diamond-shaped cross section.

[0106] See also Figure 15In one implementation of this embodiment, the plurality of heat dissipation fins 514 spaced apart in the flow channel groove 5121 on the bottom surface of the heat dissipation top plate 512 are circular fins 5143 having a circular cross section.

[0107] See also Figure 16 In another implementation of this embodiment, the plurality of heat dissipation fins 514 spaced apart in the flow channel grooves 5121 on the bottom surface of the heat dissipation top plate 512 are tooth-shaped fins 5144 having a tooth-shaped cross section.

[0108] In other implementations of this embodiment, the size, shape, arrangement layout, etc. of the heat dissipation fins 514 can be adjusted to other irregular / special-shaped heat dissipation fins 514 according to actual conditions to achieve the best heat dissipation effect of the internal flow channel 50 of the heat dissipation structure 5 on the power module 6.

[0109] Please also refer to Figure 3-9 As a preferred implementation of this embodiment, four through-holes 513 are respectively provided at the corresponding four corners of the heat dissipation bottom plate 511 and the heat dissipation top plate 512, and two mounting holes 16 are respectively provided at intervals on the top surfaces of the first water channel column 14 and the second water channel column 15. The bridge arm body 51 of the heat dissipation structure 5 is fastened to the first water channel column 14 and the second water channel column 15 by four connecting screws 10 passing through the corresponding through-holes 513 and the mounting holes 16, and is assembled in the inner cavity 11 of the shell 1.

[0110] As a preferred implementation of this embodiment, welding, sealing rings or sealant are used between the heat dissipation bottom plate 511 and the heat dissipation top plate 512 to integrally and fixedly connect the heat dissipation bottom plate 511 and the heat dissipation top plate 512 to form a complete bridge arm body 51.

[0111] In other embodiments, the internal spatial shape and layout of the planar water channel 2 and the three-dimensional water channel 3 can be adjusted according to actual conditions and are not limited to the above-mentioned structural layout of the first longitudinal water channel 21, the second longitudinal water channel 22, the first vertical water channel 31, and the second vertical water channel 32. For example, a transverse water channel as part of the planar water channel 2 and connecting the second longitudinal water channel 22 and the second vertical water channel 32 can be provided between them, or an inclined water channel can be used instead of the first vertical water channel 31 and the second vertical water channel 32.

[0112] The water channel inlet 23 can also be connected to the first vertical water channel 31 or the second vertical water channel 32 provided at one end of the inner cavity 11, and the water channel outlet 24 is provided at the end of the inner cavity 11 away from the water channel inlet 23 and connected to the planar water channel 2, so that the flow direction of the cooling water or coolant in the heat dissipation structure of the on-board charger is changed to pass through the water channel inlet 23, the first vertical water channel 31, the internal flow channel 50, the second vertical water channel 32, the planar water channel 2 and the water channel outlet 24 in sequence.

[0113] Alternatively, the water channel inlet 23 can also be connected to the internal flow channel 50 of the heat dissipation structure 5 provided at one end of the inner cavity 11, and the water channel outlet 24 is provided at the end of the inner cavity 11 away from the water channel inlet 23 and connected to the planar water channel 2, so that the flow direction of the cooling water or coolant in the heat dissipation structure of the on-board charger is changed to pass through the water channel inlet 23, the internal flow channel 50, the first vertical water channel 31 or the second vertical water channel 32, the planar water channel 2 and the water channel outlet 24 in sequence.

[0114] Please also refer to Figure 4 、 8 9. In this embodiment, the power module 6 is connected to the top surface of the heat dissipation top plate 512 facing away from the heat dissipation bottom plate 511 through the above-mentioned heat conductive structure layer 62.

[0115] See also Figure 4 、 5 , 8, 9. In one implementation of the present embodiment, the power module 6 is fastened to the fixing holes 5122 provided on the heat dissipation top plate 512 after the connecting screws 10 pass through the connecting holes 61 or connecting grooves at both ends of the power module 6, and a thermal interface material is coated between the power module 6 and the heat dissipation top plate 512 to form a thermal interface material layer serving as the above-mentioned heat conductive structure layer 62, thereby reducing the interface thermal resistance between the heat dissipation structure 5 and the power module 6 and improving the heat dissipation effect of the internal flow channel 50 of the heat dissipation structure 5 on the power module 6.

[0116] In one implementation of this embodiment, the connecting screws 10 are not used, but thermally conductive adhesive is applied between the power module 6 and the heat dissipation top plate 512 to form a thermally conductive adhesive layer serving as the above-mentioned thermally conductive structure layer 62. The thermally conductive adhesive layer can not only connect and fix the power module 6 to the heat dissipation structure 5, but also reduce the interface thermal resistance between the heat dissipation structure 5 and the power module 6, and improve the heat dissipation effect of the internal flow channel 50 of the heat dissipation structure 5 on the power module 6.

[0117] In another implementation of this embodiment, the connecting screws 10 are not used, but solder is welded between the power module 6 and the heat dissipation top plate 512 to form a solder layer serving as the above-mentioned thermal conductive structure layer 62. The solder layer can not only connect and fix the power module 6 to the heat dissipation structure 5, but also reduce the interface thermal resistance between the heat dissipation structure 5 and the power module 6, and improve the heat dissipation effect of the internal flow channel 50 of the heat dissipation structure 5 on the power module 6.

[0118] See also Figure 10 、 11In another implementation of this embodiment, instead of connecting screws 10, a pressure strip 18 is used to press against the top of the power module 6. The welding legs 181 of the pressure strip 18 are welded to the top surface of the heat dissipation top plate 512 of the bridge arm body 51 of the heat dissipation structure 5. This allows the pressure of the pressure strip 18 to be greater than that of the connecting screws 10 or locking bolts, pressing the power module against the heat dissipation structure 5. Simultaneously, a thermal interface material is applied between the power module 6 and the heat dissipation top plate 512 to form the thermal interface material layer 62 described above. This also reduces the interfacial thermal resistance between the heat dissipation structure 5 and the power module 6 and improves the heat dissipation effect of the internal flow channel 50 of the heat dissipation structure 5 on the power module 6.

[0119] In other embodiments, the power module 6 can also be installed at the position of the planar water channel 2 or the three-dimensional water channel 3, and adopt the above-mentioned pressure strips 18, connecting screws 10 or bolts, welding, adhesive connection and other connection methods.

[0120] Please also refer to Figure 1 、 4 , 5, 8, 9, in this embodiment, the three power modules 6 are connected to the top surface of the heat dissipation top plate 512 facing away from the heat dissipation bottom plate 511 at intervals through the above-mentioned heat conduction structure layer 62.

[0121] See also Figure 12 In other embodiments, through the above-mentioned heat-conducting structure layer 62, different numbers and positions of power modules 6 can be conveniently assembled and set on the heat dissipation top plate 512 of the heat dissipation structure 5 according to actual needs. For example, the number of power modules 6 can be set to four arranged at intervals on the heat dissipation top plate 512 to adapt to different power requirements of the on-board charger.

[0122] See also Figure 1 In this embodiment, the top of the housing 1 forms an opening 113 communicating with the inner cavity 11, and the heat dissipation structure of the on-board charger further includes:

[0123] The top cover 17 is covered and installed at the top opening 113 of the shell 1 to close the inner cavity 11; the circuit board 7 is installed at the corresponding opening 113 of the inner cavity 11 and is located between the top of the heat dissipation chamber 112 and the top cover 17. The circuit board 7 is electrically connected to the power module 6 and the functional module 4; the insulating layer 8 has a plurality of insulating flanges 81 arranged at intervals on the circumference of the insulating layer 8, wherein the main body of the insulating layer 8 is padded between the circuit board 7 and the top cover 17, playing the role of forming insulating protection between the circuit board 7 and the top cover 17; the insulating flanges 81 extend downward into the inner cavity 11 and are padded between the power module 6, the functional module 4 and the shell 1, playing the role of forming insulating protection between the power module 6, the functional module 4 and the shell 1.

[0124] As a preferred embodiment of this embodiment, insulating layer 8 can be an insulating film or a rigid insulating plastic layer. Using a rigid insulating plastic material for insulating layer 8 not only provides insulation but also enables fully automated assembly on the production line. The shape of insulating layer 8 and the position of insulating flange 81 can be adjusted based on the specific shapes and positions of modules such as power module 6 and functional module 4 (EMC unit and magnetic component unit).

[0125] See also Figure 1 As a preferred implementation scheme of this embodiment, the second EMC unit 42 and the first magnetic element unit 43 are respectively fixedly arranged in the front and rear heat dissipation chambers 112 on the left side of the inner cavity 11 of the shell 1 (that is, one end of the inner cavity 11 in the second horizontal direction Y), and the first EMC unit 41 and the second magnetic element unit 44 are respectively fixedly arranged in the front and rear heat dissipation chambers 112 on the right side of the inner cavity 11 of the shell 1 (that is, the other end opposite to the inner cavity 11 in the second horizontal direction Y).

[0126] See also Figure 1 As a preferred implementation of this embodiment, the filter unit 45 is a filter plate (and its components), which is vertically arranged in the inner cavity 11 of the shell 1 and is directly connected to the water channel wall of the three-dimensional water channel 3 through a heat-conducting structure.

[0127] In other embodiments, the number, arrangement and placement of the above functional modules 4 and the corresponding number and arrangement of the heat dissipation chambers 112 can be adjusted according to actual conditions.

[0128] In this embodiment, each of the above functional modules 4 can be placed separately in the corresponding heat dissipation chamber 112 and then electrically connected to the circuit board 7 respectively.

[0129] In other embodiments, the above functional modules 4 may also be first connected to the circuit board 7 and installed as a whole, and then placed in the inner cavity 11 of the housing 1 together with the circuit board 7 .

[0130] In this embodiment, the power module 6 is first assembled on the heat dissipation structure 5 in the above-mentioned manner, and then the corresponding terminals of the power module 6 are welded to the circuit board 7 .

[0131] In this embodiment, the circuit board 7 is a PCB board, a power board or a chip board.

[0132] Please also refer to Figure 1-6 The present invention also provides a vehicle-mounted charger, which applies the above-mentioned vehicle-mounted charger heat dissipation structure, and the vehicle-mounted charger further includes:

[0133] A plurality of plug-in modules 9 are provided on the periphery of the housing 1 .

[0134] In this embodiment, the plug-in module 9 includes power terminals, power supply terminals, and the like.

[0135] In this embodiment, the on-board charger also includes a cooling circulation device (not shown in the figure) for driving the coolant or cooling water to circulate and exchange heat between the above-mentioned planar water channel 2, the internal flow channel 50 of the heat dissipation structure 5, the three-dimensional water channel 3 and the outside of the on-board charger.

[0136] The working principle of the heat dissipation structure of the vehicle charger provided by the utility model is as follows:

[0137] The cooling circulation device inputs coolant or cooling water into the first longitudinal water channel 21 from the water channel inlet 23. The first longitudinal water channel 21 is provided with a plurality of heat dissipation protrusions 123 arranged irregularly at intervals. This can increase the heat exchange area between the coolant or cooling water and the first longitudinal water channel 21 and increase the flow rate, thereby improving the heat dissipation efficiency of the second EMC unit 42 and the first magnetic element unit 43 provided on the left side of the inner cavity 11 of the housing 1.

[0138] After the coolant or cooling water flows through the first longitudinal water channel 21 and reaches the left water outlet 1212 of the left water channel groove 121, it flows upward through the bottom water inlet 311 of the first vertical water channel 31 and enters the first vertical water channel 31. Then, from the top water outlet 312 of the first vertical water channel 31, it flows into the water inlet hole 521 of the water inlet connector 52 of the heat dissipation structure 5 and the water inlet end of the internal flow channel 50 of the heat dissipation structure 5 in sequence, and then flows upward into the internal flow channel 50.

[0139] While the coolant or cooling water flows through the internal flow channel 50 and the heat dissipation fins 514 therein (the heat dissipation fins 514 may be rectangular, diamond-shaped, circular, or tooth-shaped, etc.), it conducts heat to each power module 6 connected to the heat dissipation structure 5 through the heat conductive structure layer 62;

[0140] After flowing through the internal flow channel 50, the coolant or cooling water flows downwardly through the flow channel outlet end of the internal flow channel 50, the water outlet hole 531 of the water outlet joint 53 of the heat dissipation structure 5, and the top water inlet 322 of the second vertical water channel 32 into the second vertical water channel 32, and then flows downwardly from the bottom water outlet 321 of the second vertical water channel 32 into the right water inlet end 1221 of the right water channel groove 122 and reaches the interior of the second longitudinal water channel 22. When flowing through the first vertical water channel 31 and the second vertical water channel 32, the coolant or cooling water can also conduct heat to the filter unit 45.

[0141] The second longitudinal water channel 22 is provided with heat dissipation protrusions 123 having the same function as those in the first longitudinal water channel 21. When flowing through the second longitudinal water channel 22, the coolant or cooling water will pass through these heat dissipation protrusions 123 again, thereby improving the heat dissipation efficiency of the first EMC unit 41 and the second magnetic element unit 44 located on the right side of the inner cavity 11 of the housing 1. Finally, the coolant or cooling water flows out through the water channel outlet 24 and returns to the cooling circulation device. The above steps are repeated to complete the entire cooling cycle of the on-board charger heat dissipation structure.

[0142] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art should understand that any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A heat dissipation structure of an on-board charger, characterized in that: include: A shell (1), wherein an inner cavity (11) of the shell (1) is provided with a planar water channel (2), the inner cavity is provided with a three-dimensional water channel (3) communicating with the planar water channel (2), and the inner cavity (11) is divided into a plurality of heat dissipation chambers (112) connected to the planar water channel (2) and / or the three-dimensional water channel (3); A plurality of functional modules (4) are respectively placed in each of the heat dissipation chambers (112); The heat dissipation structure (5) is disposed in the inner cavity (11) and is connected to the three-dimensional water channel (3) or the planar water channel (2) through its internal flow channel (50); At least one power module (6) is connected to the heat dissipation structure (5) or the three-dimensional water channel (3) or the planar water channel (2).

2. The heat dissipation structure of the on-board charger according to claim 1, characterized in that: The power module (6) is connected to the heat dissipation structure (5) via a heat-conducting structural layer (62).

3. The heat dissipation structure of the on-board charger according to claim 2, characterized in that: The heat-conducting structural layer (62) is a thermal interface material layer, a heat-conducting adhesive layer or a solder layer.

4. The heat dissipation structure of the on-board charger according to claim 2, characterized in that: Also includes: A waterway inlet (23) and a waterway outlet (24) are arranged on the housing (1) at intervals; The three-dimensional waterway (3) comprises: A first vertical water channel (31) and a second vertical water channel (32) are spaced apart and arranged at one end of the inner cavity (11); The planar waterway (2) comprises: A first longitudinal water channel (21) and a second longitudinal water channel (22) are arranged at intervals on both sides of the bottom of the shell (1), and are respectively connected to the water channel inlet (23), the first vertical water channel (31), the water channel outlet (24), and the second vertical water channel (32); The internal flow channel (50) is connected between the first vertical water channel (31) and the second vertical water channel (32).

5. The heat dissipation structure of the on-board charger according to claim 4, characterized in that: The first longitudinal water channel (21) and the second longitudinal water channel (22) are respectively connected to the bottom water inlet (311) of the first vertical water channel (31) and the bottom water outlet (321) of the second vertical water channel (32); The heat dissipation structure (5) comprises: A bridge arm body (51) having the internal flow channel (50) disposed therein; The water inlet joint (52) and the water outlet joint (53) are spaced apart at the two ends of the bottom of the bridge arm body (51); the water inlet joint (52) and the water outlet joint (53) are respectively provided with a water inlet hole (521) and a water outlet hole (531); the water inlet hole (521) and the water outlet hole (531) are respectively connected to the water inlet end of the internal flow channel (50) and the top water outlet (312) of the first vertical water channel (31), and the water outlet end of the internal flow channel (50) and the top water inlet (322) of the second vertical water channel (32).

6. The heat dissipation structure of the on-board charger according to claim 5, characterized in that: A left water channel groove (121) and a right water channel groove (122) are arranged at intervals on the outer surface of the bottom wall (12) of the shell (1) facing away from the inner cavity (11); the left water inlet end (1211) of the left water channel groove (121) and the right water outlet end (1222) of the right water channel groove (122) are respectively connected to the water channel inlet (23) and the water channel outlet (24); the left water outlet end (1212) of the left water channel groove (121) and the right water inlet end (1221) of the right water channel groove (122) respectively extend to one end of the bottom wall (12) opposite to the water channel inlet (23) and the water channel outlet (24); a plurality of heat dissipation protrusions (123) are arranged at intervals on both the left water channel groove (121) and the right water channel groove (122); The on-board charger heat dissipation structure further includes: The waterway cover plate (13) is sealed and connected to the outer surface of the bottom wall (12), and respectively forms the first longitudinal waterway (21) and the second longitudinal waterway (22) with the left waterway groove (121) and the right waterway groove (122).

7. The heat dissipation structure of the on-board charger according to claim 6, characterized in that: The first waterway column (14) and the second waterway column (15) are arranged at intervals on the inner surface of the bottom wall (12) facing the inner cavity (11) at one end relative to the waterway inlet (23) and the waterway outlet (24); the hollow interiors of the first waterway column (14) and the second waterway column (15) respectively form the first vertical waterway (31) and the second vertical waterway (32) extending vertically; the bottom water inlet (311) and the bottom water outlet (321) are respectively connected to the left water outlet (1212) and the right water inlet (1221); the top water outlet (312) and the top water inlet (322) are respectively arranged on the top surfaces of the first waterway column (14) and the second waterway column (15).

8. The heat dissipation structure of the on-board charger according to claim 7, characterized in that: A first installation step (141) surrounding the first vertical water channel (31) is formed at the connection between the top water outlet (312) and the top surface of the first water channel column (14); a first sealing groove (1411) surrounding the first vertical water channel (31) is provided on the bottom surface of the first installation step (141); a first sealing ring (142) is embedded in the first sealing groove (1411); A second installation step (151) surrounding the second vertical water channel (32) is formed at the connection between the top water inlet (322) and the top surface of the second water channel column (15); a second sealing groove (1511) surrounding the second vertical water channel (32) is provided on the bottom surface of the second installation step (151); a second sealing ring (152) is embedded in the second sealing groove (1511); The water inlet joint (52) is installed on the first installation step (141), and the water inlet hole (521) is connected to the top water outlet (312), and the end of the water inlet joint (52) is pressed against the first sealing ring (142); The water outlet joint (53) is installed on the second installation step (151), and the water outlet hole (531) is connected to the top water inlet (322), and the end of the water outlet joint (53) is pressed against the second sealing ring (152).

9. The heat dissipation structure of the on-board charger according to claim 8, characterized in that: The outer side surface of the water inlet joint (52) is provided with a third sealing groove (522) surrounding the circumference thereof, and a third sealing ring (5221) is embedded in the third sealing groove (522); The outer side surface of the water outlet joint (53) is provided with a fourth sealing groove (532) surrounding the circumference thereof, and a fourth sealing ring (5321) is embedded in the fourth sealing groove (532); When the water inlet joint (52) is installed on the first installation step (141), the inner side surface of the first installation step (141) presses the third sealing ring (5221); When the water outlet joint (53) is installed on the second installation step (151), the inner side surface of the second installation step (151) presses the fourth sealing ring (5321).

10. The heat dissipation structure of the on-board charger according to any one of claims 5 to 9, characterized in that: The bridge arm body (51) comprises: A heat dissipation base plate (511), wherein the water inlet joint (52) and the water outlet joint (53) are spaced apart at both ends of the bottom of the heat dissipation base plate (511), and the water inlet hole (521) and the water outlet hole (531) respectively correspond to and penetrate the two ends of the top surface of the heat dissipation base plate (511); A heat dissipation top plate (512), wherein a flow channel groove (5121) is provided on the bottom surface of the heat dissipation top plate (512) facing the heat dissipation bottom plate (511), and the two ends of the flow channel groove (5121) respectively extend to positions covering the water inlet hole (521) and the water outlet hole (531); a plurality of heat dissipation fins (514) are arranged at intervals in the flow channel groove (5121); The heat dissipation top plate (512) and the heat dissipation bottom plate (511) are connected to each other up and down to form a bridge arm body (51), and the heat dissipation bottom plate (511) and the flow channel groove (5121) enclose the internal flow channel (50); The power module (6) is connected to the top surface of the heat dissipation top plate (512) facing away from the heat dissipation bottom plate (511) through the heat conduction structural layer (62).

11. The heat dissipation structure of the on-board charger according to any one of claims 1 to 9, characterized in that: The functional module (4) includes: The first EMC unit (41), the second EMC unit (42), the first magnetic element unit (43), and the second magnetic element unit (44) are respectively and correspondingly placed in the heat dissipation chamber (112) connected to the planar water channel (2); The filter unit (45) is placed in the heat dissipation chamber (112) connected to both the planar water channel (2) and the three-dimensional water channel (3).

12. The heat dissipation structure of the on-board charger according to any one of claims 1 to 9, characterized in that: The top end of the housing (1) forms an opening (113) communicating with the inner cavity (11), and the on-board charger heat dissipation structure further comprises: A top cover (17) is installed to cover the opening (113) to close the inner cavity (11); A circuit board (7) is installed in the inner cavity (11) at a position corresponding to the opening (113) and is located between the top of the heat dissipation chamber (112) and the top cover (17); the circuit board (7) is electrically connected to the power module (6) and the functional module (4); An insulating layer (8), wherein a plurality of insulating flanges (81) are arranged at intervals on the circumference of the insulating layer (8), the insulating layer (8) is padded between the top cover (17) and the circuit board (7), and the insulating flanges (81) extend into the inner cavity (11) and are padded between the power module (6), the functional module (4) and the housing (1).

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