CN220108299U

CN220108299U - Conductive connecting piece, circuit board assembly structure and vehicle-mounted charger

Info

Publication number: CN220108299U
Application number: CN202321009200.4U
Authority: CN
Inventors: 兰刘健; 姚宇飞; 彭维峰; 付建新; 刘邦; 陈祥; 郑汉章; 姜钊; 黄呈武; 廖政伟
Original assignee: Ningbo Junsheng New Energy Research Institute Co ltd
Current assignee: Ningbo Junsheng New Energy Research Institute Co ltd
Priority date: 2023-04-28
Filing date: 2023-04-28
Publication date: 2023-11-28
Anticipated expiration: 2033-04-28

Abstract

The utility model discloses a conductive connecting piece, a circuit board assembly structure and a vehicle-mounted charger, wherein the circuit board comprises a printed substrate, and a plurality of circuit grounding positions are arranged on the upper surface of the printed substrate; the conductive connecting piece comprises a first column body and a second column body which are integrally formed from bottom to top, and the diameter of the first column body is larger than that of the second column body; the metal shell is provided with a mounting hole corresponding to the circuit grounding position, and the circuit grounding position of the circuit board is provided with a connecting through hole; the first column body of each conductive connecting piece is embedded in the corresponding mounting hole in an interference manner, the second column body extends upwards towards the circuit board and penetrates through the upper surface of the printed substrate to form a connecting end, the connecting end is welded with the upper surface of the printed substrate, and the circuit grounding position of the circuit board is conducted with the metal shell to realize grounding; the circuit board layout is more facilitated, the structure is more compact, the power density of the shell is improved, and the grounding effect is better.

Description

Conductive connecting piece, circuit board assembly structure and vehicle-mounted charger

Technical Field

The utility model relates to the technical field of electronic device assembly of electric automobiles, in particular to an assembly structure of a circuit board, and aims to realize grounding connection of the circuit board through the assembly structure and a vehicle-mounted charger of the assembly structure of a vehicle-mounted circuit board.

Background

The new energy automobile OBC is a power electronic device for charging the vehicle-mounted power battery, and can safely and reliably complete the charging management of the power battery. Typically, an OBC includes a housing and several PCBA circuit boards. PCBA circuit board is as the key part of OBC, and its assembly structure is very big to the performance of OBC influence.

As shown in fig. 1, in the prior art, the physical connection of the PCBA circuit board 10 and the metal housing 100 and the grounding of the PCBA circuit board are generally achieved by means of screw fastening. The upper surface of the PCBA circuit board is provided with a through hole in advance, the shell is provided with a threaded mounting hole corresponding to the position, and the screw 20 passes through the through hole from the upper surface of the PCBA circuit board and is screwed with the threaded hole until the head of the screw is tightly pressed on the PCBA circuit board.

The mode of screw installation needs the installation region of reserved screw on the PCBA circuit board, and screw tip size is just not little, and the space that the mounting tool reserved in addition will occupy a large amount of PCBA circuit board regions, influences PCBA circuit board overall arrangement. And because screw tightening is required for each grounding point, the more the grounding points, the lower the assembly efficiency and the higher the assembly cost. In addition, the scheme of screw installation has the problem of looseness prevention, and after long-time vibration, looseness prevention has the possibility of failure, and this can lead to contact resistance to increase, and the overall arrangement is easy to generate heat, and the conductivity also will be influenced.

Disclosure of Invention

Aiming at a plurality of problems existing in the grounding connection of the PCBA circuit board by the screws in the background technology, the utility model provides the circuit board assembly structure, which ensures that the grounding connection of the circuit board is simple and difficult to loosen, the occupied space of the grounding connection parts is small, the conductivity of the grounding connection part is excellent, and the grounding effect is better.

The technical scheme adopted for solving the technical problems is as follows: the circuit board assembly structure comprises a metal shell, a circuit board and a plurality of conductive connecting pieces;

the circuit board comprises a printed substrate, and a plurality of circuit grounding positions are arranged on the upper surface of the printed substrate;

the circuit board is horizontally arranged in the metal shell, and the conductive connecting piece is vertically connected between the metal shell and the circuit board;

the conductive connecting piece comprises a first column body and a second column body which are integrally formed from bottom to top, and the diameter of the first column body is larger than that of the second column body;

the metal shell is provided with a mounting hole corresponding to the circuit grounding position, and the circuit grounding position of the circuit board is provided with a connecting through hole;

the first column body of each conductive connecting piece is embedded in the corresponding mounting hole in an interference manner, and the second column body extends upwards towards the circuit board and penetrates through the connecting through hole;

the second cylinder exceeds the upper surface of the printed substrate to form a connecting end, the connecting end is welded with the upper surface of the printed substrate, and the circuit grounding position of the circuit board is communicated with the metal shell.

The preferred technical scheme adopted by the utility model for solving the technical problems is as follows: the metal shell is provided with a support column, and the printed substrate is erected on the support column;

the first column body is provided with an annular upper end face surrounding the second column body;

and an installation gap is formed between the lower surface of the printed substrate and the annular upper end surface of the first cylinder.

The preferred technical scheme adopted by the utility model for solving the technical problems is as follows: the height of the first column body is larger than the hole depth of the mounting hole;

the bottom surface of the first column body is contacted with the hole bottom of the mounting hole;

the annular upper end surface is higher than the upper surface of the metal shell.

the conductive connecting piece is an aluminum alloy part, and the metal shell is an aluminum die casting.

the first column body comprises a cylindrical part with equal diameter and a guide part with gradually reduced outer diameter from top to bottom;

the outer diameter of the small-diameter end of the guide part is smaller than the inner diameter of the mounting hole.

the guide part sequentially comprises a cone section and a transition section from bottom to top;

the cylindrical part comprises a cylindrical surface at the periphery, and the frustum section comprises a conical surface at the periphery;

the peripheral wall of the transition section is in smooth transition with the cylindrical surface and the conical surface through cambered surfaces.

The utility model solves the technical problems as follows: the vehicle-mounted charger comprises the circuit board assembly structure.

The utility model solves the technical problems by adopting the following preferable technical scheme: the circuit board in the metal shell comprises a signal main board and a plurality of filter boards;

the metal shell comprises an A side and a B side which are separated by a transverse separation wall with a concave-convex structure;

the signal main board is positioned on the A side of the metal shell;

the filter plate is positioned on the side B of the metal shell;

at least the signal main board adopts the circuit board assembly structure.

The utility model solves the technical problems by adopting the following preferable technical scheme: the metal shell is provided with a plurality of strip-shaped water channels for storing cooling liquid;

the strip-shaped water channel is recessed from the side B to the side A, and strip-shaped convex edges are formed on the side A;

the mounting hole is arranged on the upper surface of the side A of at least one strip-shaped convex rib;

the signal main board is connected with the strip-shaped convex edges through the conductive connecting piece.

The utility model solves the technical problems by adopting the following preferable technical scheme: the side A of the metal shell is provided with a first accommodating groove and a second accommodating groove which are recessed from the side A to the side B;

the first accommodating groove and the second accommodating groove are separated by the strip-shaped convex rib;

the first accommodating groove is used for arranging a magnetic piece, and the second accommodating groove is used for arranging a power device;

the power device is tightly pressed on the outer side wall of the strip-shaped convex edge through the pressing elastic sheet.

The utility model solves the technical problems by adopting the following preferable technical scheme: a connector is arranged on one side of the peripheral side wall of the metal shell;

a longitudinal separation wall is arranged on one side of the A side of the metal shell close to the connector;

the longitudinal partition wall extends upwardly and through the signal motherboard.

The utility model solves the technical problems by adopting another technical scheme as follows: the conductive connecting piece is used for connecting the metal shell and the circuit board to realize grounding of the circuit board;

the conductive connecting piece comprises a first column body and a second column body which are integrally formed from bottom to top, the diameter of the first column body is larger than that of the second column body, and the conductive connecting piece is an aluminum alloy part;

the first column body is used for being embedded in the mounting hole of the metal shell in an interference mode, and the second column body is used for being welded with the circuit grounding position of the upper surface of the circuit board in an upward direction penetrating through the circuit board so as to conduct the circuit board with the metal shell.

The utility model solves the technical problems by adopting the following preferable technical scheme: the first column body comprises a cylindrical part with equal diameter and a guide part with gradually reduced outer diameter from top to bottom;

Compared with the prior art, the utility model adopts the technical proposal as follows:

the conductive connecting piece is tightly matched with the mounting hole of the metal shell through plastic extrusion, and the conductive connecting piece and the circuit board are welded and fixed through wave soldering or selective welding. And besides the grounding arrangement, the connection of the conductive connecting piece also plays a role in assisting physical connection, so that the connection stability of the circuit board and the shell is further enhanced. This simplifies the assembly process of the circuit board and is more conducive to automated assembly.

The pin part of the conductive connecting piece penetrates through the circuit board to be distributed in a pin mode, so that the pin part of the conductive connecting piece occupies small space, is small in installation space of the fixture, is more beneficial to circuit board distribution, is more compact in structure and improves the power density of the shell.

The conductive connecting piece is not stressed by torque in the installation process, is only a longitudinal compression tool, so that the requirement on the rigidity of materials is reduced, the conductive connecting piece can be made of aluminum alloy materials which are the same as the metal shell, poor contact caused by the influence of thermal expansion and cold contraction is not easy to occur, electrochemical corrosion is not easy to occur, the electrical conductivity is improved, and the grounding effect is better.

Fourth, the tight fit is passed through plastic extrusion between electrically conductive connecting piece and the mounting hole of metal casing, and the periphery of first cylinder and the week side in mounting hole in close contact, and area of contact is big hugs tightly strong, is difficult for becoming flexible. The depth of the mounting hole is not limited, and compared with the reduction of the depth of the threaded hole, the mounting hole has less influence on the design of the internal functions of the shell.

Drawings

The utility model will be described in further detail below in connection with the drawings and the preferred embodiments, but it will be appreciated by those skilled in the art that these drawings are drawn for the purpose of illustrating the preferred embodiments only and thus should not be taken as limiting the scope of the utility model. Moreover, unless specifically indicated otherwise, the drawings are merely intended to conceptually illustrate the compositions or constructions of the described objects and may contain exaggerated representations, and the drawings are not necessarily drawn to scale.

FIG. 1 is a schematic diagram of a circuit board ground connection in the background of the utility model;

fig. 2 is an overall schematic diagram of the vehicle-mounted charger according to the preferred embodiment of the present utility model;

fig. 3 is a partial construction sectional view of the vehicle-mounted charger of the preferred embodiment of the present utility model;

FIG. 4 is a schematic diagram of the assembly of a metal housing and a power device according to a preferred embodiment of the present utility model;

FIG. 5 is a schematic diagram showing the separation state of the metal shell and the conductive connecting piece according to the preferred embodiment of the utility model;

FIG. 6 is a schematic view showing an assembled state of the metal housing and the conductive connector according to the preferred embodiment of the present utility model;

fig. 7 is a schematic diagram showing a first assembled state of the ground connection of the circuit board according to the preferred embodiment of the present utility model;

fig. 8 is a schematic diagram of a second circuit board ground connection assembly state according to a preferred embodiment of the present utility model;

fig. 9 is a schematic diagram of a circuit board ground connection assembly state III according to a preferred embodiment of the present utility model;

FIG. 10 is an enlarged view of a portion of the circle of FIG. 5 in accordance with the preferred embodiment of the present utility model;

FIG. 11 is an enlarged view of a portion of the circle of FIG. 6 in accordance with the preferred embodiment of the present utility model;

FIG. 12 is an enlarged partial schematic view of the circle of FIG. 7 in accordance with the preferred embodiment of the utility model;

FIG. 13 is an enlarged view of a portion of the circle of FIG. 8 in accordance with the preferred embodiment of the present utility model;

FIG. 14 is an enlarged partial schematic view of the circle of FIG. 9 in accordance with the preferred embodiment of the utility model;

FIG. 15 is a schematic view of the B side of the metal shell of the preferred embodiment of the present utility model;

fig. 16 is a schematic view of a conductive connector according to a preferred embodiment of the present utility model.

Description of the embodiments

Preferred embodiments of the present utility model will be described in detail below with reference to the accompanying drawings. Those skilled in the art will appreciate that these descriptions are merely illustrative, exemplary, and should not be construed as limiting the scope of the utility model.

It should be noted that: like reference numerals denote like items in the following figures, and thus once an item is defined in one figure, it may not be further defined and explained in the following figures.

It will be appreciated by those skilled in the art that in the present disclosure, the terms "vertical," "transverse," "upper," "lower," "front," "rear," "left," "right," "longitudinal," "horizontal," "bottom," "inner," "outer," etc. refer to an orientation or positional relationship based on that shown in the drawings, which is merely for convenience of description and to simplify the description, rather than to indicate or imply that the devices or elements referred to must have a particular orientation, be configured and operated in a particular orientation, and therefore the above terms should not be construed as limiting the present utility model.

It will be understood that the terms "a" and "an" should be interpreted as referring to "at least one" or "one or more," i.e., in one embodiment, the number of elements may be one, while in another embodiment, the number of elements may be plural, and the term "a" should not be interpreted as limiting the number. While the terms "first" and "second" are used for descriptive purposes only and not for purposes of limitation, there is no other directional meaning.

As shown in fig. 2-3, 7, and 15, the present embodiment provides a vehicle-mounted charger, which includes a metal case 100, an upper cover 200, and a lower cover. The metal shell 100 includes a side a and a side B separated by a transverse dividing wall. The transverse partition wall presents a concave-convex structure, so that the concave-convex of the side A and the side B presents a bidirectional multi-cavity structure. The upper cover 200 and the lower cover are provided at the a side and the B side of the metal case 100, respectively, to seal the metal case 100. The bidirectional multi-cavity structure enables the space to be more fully utilized, the whole vehicle-mounted charger is more compact in structure, and the power density can be designed in a larger mode.

As shown in fig. 2-5 and 7, a signal main board 400, a magnetic member, a plurality of filter boards and a plurality of power devices 500 are disposed in the metal housing 100. The power device 500 includes a transformer, a MOS transistor, and the like. Both the signal motherboard 400 and the filter board are PCBA circuit boards. A connector 800 is provided at one side of the outer circumferential wall of the metal case 100 to draw out the circuit inside the metal case 100. The metal shell 100 is provided with the mounting opening K with an upper side being open, the connector 800 is fixedly mounted from top to bottom and sealed by the FIPG glue, so that the production and the mounting are more convenient, and the sealing effect is better.

In the present embodiment, as shown in fig. 3, 4, 7, and 15, the a side of the metal housing 100 is provided with a first mounting position P for accommodating the signal motherboard 400, and the first mounting position is surrounded by the peripheral side wall of the a side of the metal housing 100. The B side of the metal case 100 is provided with a plurality of second mounting locations S where a single filter plate is independently mounted. The signal main board 400 is located on the a side of the metal housing 100; the filter plate is located on the B side of the metal housing 100. The signal main board 400 and the filter board are effectively isolated and shielded by a transverse isolating wall; the filter plates are independently arranged through vertical partition walls between the mounting positions, and are also isolated and shielded, so that the electromagnetic compatibility of the vehicle-mounted charger is improved.

The present embodiment provides a circuit board assembly structure that can be applied to assembly between any one of the signal main board 400, the filter board, and the metal housing 100. In the present embodiment, the signal motherboard 400 is mounted in the metal housing 100 as a circuit board to which such a circuit board mounting structure is applied, realizing its ground connection and auxiliary physical connection.

In particular, as shown in fig. 5-14, the circuit board assembly structure includes a metal housing 100, a circuit board and a plurality of conductive connectors 600. The signal motherboard 400 is stated herein as a circuit board. The signal motherboard 400 includes a printed substrate J, and a plurality of circuit ground positions are disposed on the upper surface of the printed substrate J. The signal main board 400 is disposed in the metal housing 100 in a substantially horizontal posture, and the conductive connector 600 is vertically connected between the metal housing 100 and the circuit board.

It should be noted that, the signal main board 400 and the metal housing 100 are physically connected in the first layer by means of fasteners or the like. The level of physical connection points is less and there is no special requirement for a specific location, thus having less impact on the circuit layout of the signal motherboard 400.

The connection between the signal motherboard 400 and the metal housing 100 by the conductive connection element 600 is a second-level connection, and is an electrical connection, so as to conduct the circuit ground on the signal motherboard 400 with the metal housing 100 to realize the ground zero potential setting. The specific arrangement is related to the circuit layout of the signal motherboard 400.

As shown in fig. 5 to 14, the conductive connecting member 600 includes, from bottom to top, a first cylinder 1 and a second cylinder 2 integrally formed, the first cylinder 1 having a diameter larger than that of the second cylinder 2. The metal housing 100 is provided with a mounting hole N corresponding to a circuit ground position, and the circuit ground position of the signal main board 400 is provided with a connection through hole M. The first column 1 of each conductive connector 600 is embedded in the corresponding mounting hole N with interference, and the second column 2 extends upward toward the circuit board and passes through the connection through hole M. The second post 2 exceeds the upper surface of the printed substrate J to form a connection end G, the connection end G is welded to the upper surface of the printed substrate J, and the circuit ground of the signal main board 400 is conducted with the metal housing 100, so that the ground setting of the signal main board 400 is realized. In addition to completing the ground arrangement, the connection of the conductive connector 600 also serves to assist in the physical connection, further enhancing the stability of the connection of the signal motherboard 400 to the housing.

In terms of machining, the conventional screw tightening grounding process requires additional machining of a screw hole in the metal case 100, which requires high precision of the screw hole and increases machining cost, and requires screw tightening for each grounding point, the more the grounding points, the higher the machining cost, the lower the assembly efficiency and the higher the assembly cost. Whereas in this embodiment only a normal blind hole is machined as the mounting hole N. And the conductive connecting piece 600 and the circuit board can be directly welded and fixed through wave soldering or selective soldering without additional assembly procedures. This simplifies the assembly process of the circuit board and is more conducive to automated assembly. Preferably, the surface of the connecting end G of the second cylinder 2 is coated with a surface coating which facilitates welding.

In addition, the second pillars 2 may be laid out as component pins, and the shape of the end of the second pillars away from the first pillars is not limited. Because the diameter of the second cylinder 2 in this embodiment may be designed to be smaller, there is no need to reserve a space reserved for a large-area mounting tool, and occupation of a circuit board area may be reduced. By the design of the conductive connection 600, the required mounting area for the fastening screw is released, facilitating the circuit board circuit layout, compared to the conventional way of fastening screw grounding. Based on the conductive connector 600 instead of the conventional screw-tight grounding scheme, the space of the circuit board and the metal housing 100 is more effectively utilized, the volume can be made smaller, and the improvement of the housing power density is facilitated.

Preferably, in this embodiment, the second column 2 and the first column 1 are each of a circular cross-sectional configuration. The diameter of the second cylinder 2 is chosen mainly with regard to two points: first, the strength of the weld is concerned; second, the circuit layout is concerned. The diameter of the second cylinder 2 balances these two points, mainly according to the specific design requirements. While the diameter of the first cylinder 1 is chosen with two points in mind: first, the size coordination with the second column 2 ensures the overall strength of the conductive connecting piece 600; second, in coordination with the layout of the metal shell 100, the space occupation of the metal shell 100 is minimized. The first of these two points is particularly important.

Preferably, the metal housing 100 is an aluminum die cast so that it can be formed with more complex surface structures to provide the assembly requirements of the various components. And the light texture of the aluminum die casting also meets the requirement of light weight of the automobile.

In the traditional screw tightening and grounding process, the screws are subjected to torque in the mounting process, so that the diameters of the screws cannot be too small, the materials cannot be soft, the layout design is limited, and the selection of the materials of the screws is limited. In this case, the screw itself is generally made of carbon steel. This has a potential difference with the aluminum die-cast metal housing 100, and electrochemical corrosion is likely to occur between the screw and the metal housing 100. And the difference of thermal expansion coefficients between the screw and the metal shell 100 is large, so that gaps are easily generated due to thermal expansion and contraction, and the electric conduction performance is further reduced.

In this embodiment, the conductive connector 600 is not subjected to torque during the installation process, but is only a longitudinal pressing tool, so that the requirement on the rigidity of the material is reduced. In this embodiment, the conductive connecting member 600 is made of aluminum alloy material. Because the metal shell 100 is also made of aluminum alloy materials, the thermal expansion coefficients of the metal shell and the aluminum alloy material are close, and poor contact caused by the influence of thermal expansion and cold contraction is not easy to occur. And because the two materials are aluminum alloy materials, potential difference hardly exists between the materials, and electrochemical corrosion influence caused by the potential difference is greatly reduced, so that the electric conduction performance is improved, and the grounding effect is better.

In addition, in the process of tightly fixing the screw, the screw is screwed and connected, and the possibility of loosening exists after long-time vibration, so that the contact resistance is increased, the part is easy to generate heat, and the conductivity is also influenced. In the present embodiment, the conductive connecting piece 600 is tightly matched with the mounting hole N of the metal housing 100 through plastic extrusion, the outer peripheral surface of the first column body 1 is tightly contacted with the peripheral side surface of the mounting hole N, the contact area is large, the holding force is strong, and the looseness is not easy.

As shown in fig. 6, 11, 13 and 14, further, the metal housing 100 is provided with a support column 3, and the printed substrate J is mounted on the support column 3; the first cylinder 1 has an annular upper end face D surrounding the second cylinder 2; a mounting gap F is provided between the lower surface of the printed substrate J and the annular upper end surface D of the first cylinder 1. Preferably, the support columns 3 are physically connected to the printed substrate J by fastening screws in the first level described above.

In the conventional screw tightening grounding process, the contact surface between the metal housing 100 and the circuit board generally needs machining treatment, which increases the machining cost; if machining is not performed, the flatness of the metal housing 100 is poor due to the limitation of the die casting process, and it is difficult to control the metal housing to be in the same plane with the mounting and positioning surface of the circuit board, and no matter whether the contact surface is higher or lower than the circuit board, mechanical stress is generated after the screw is fastened to be applied to the circuit board, so that the welding point and the mounting size of the device on the circuit board are adversely affected. In the present embodiment, the mounting gap F is formed between the lower surface of the printed substrate J and the annular upper end surface D of the first column 1, so as to avoid the requirement of flatness on the contact surface between the metal housing 100 and the circuit board, and avoid the problem of mechanical stress caused by the problem of flatness on the contact surface.

Preferably, the height of the first cylinder 1 is greater than the hole depth of the mounting hole N; the bottom surface of the first column 1 is in contact with the hole bottom of the mounting hole N. The annular upper end surface D is higher than the surface of the metal shell 100. This arrangement is due to the fact that the annular upper end surface D is used as a tooling arrangement location in the embedding of the conductive connector 600. The height of the first column body 1 is larger than the hole depth of the mounting hole N, so that the tool cannot be pressed to the surface of the metal shell 100, and damage to the metal shell 100 is avoided.

As shown in fig. 10, 14, 16, the first cylinder 1 preferably includes a cylindrical portion 11 having an equal diameter from top to bottom and a guide portion 12 having an outer diameter gradually decreasing from top to bottom; the small diameter end of the guide portion 12 has an outer diameter smaller than the inner diameter of the mounting hole N. The first cylinder 1 having the maximum outer diameter larger than the mounting hole N can be easily and conveniently inserted into the mounting hole N by the guide of the guide portion 12.

Further preferably, as shown in fig. 16, the guide portion 12 includes a taper section 121 and a transition section 122 in this order from bottom to top; the cylindrical part 11 comprises a cylindrical surface on the periphery, and the frustum section 121 comprises a conical surface R on the periphery; the outer peripheral wall of the transition section 122 is in transition with the cylindrical surface T and the conical surface R through the cambered surface H. Such an arrangement is more conducive to guiding and assembly of the two.

Preferably, the cylindrical surface can be knurled, after knurling is increased, the pressed contact surface can be reduced on the premise of meeting the requirement of contact resistance, and the pressed value is reduced, so that the interference quantity of the PIN and the shell can be increased, the influence of machining tolerance and surface treatment plating thickness tolerance is reduced, the range value of contact resistance fluctuation is reduced, and the consistency is improved. The machine with smaller tonnage can be adopted, and the cost is reduced.

As shown in fig. 3-6 and 10-11, the metal shell 100 is provided with a plurality of strip-shaped water channels 4 for storing cooling liquid; the strip-shaped water channel 4 is recessed from the side B to the side A and strip-shaped convex edges 5 are formed on the side A. The mounting hole N is arranged on the upper surface of the A side of the strip-shaped convex rib 5; the signal main board 400 is connected to the strip-shaped rib 5 through the conductive connector 600. Assume that a conventional screw tightening grounding process is employed. The threaded holes in the metal shell 100 require a locking depth of at least 1.5 x diameter Dmm and therefore a greater depth is required which will affect the design of the strip-shaped waterway 4, the cross-sectional shape of which is affected by the sinking threaded holes. In this embodiment, the conductive connector 600 is plastically extruded to form an interference-fit connection, and the depth of the mounting hole N is not limited, so that the influence on the internal cross section of the water channel is smaller than the depth of the threaded hole.

Since providing a water channel in the metal case 100 is based on consideration of heat dissipation, how to use the space around the water channel is also a key how to improve the stability of the in-vehicle battery charger. In this embodiment, the conductive connecting piece 600 is disposed on the wall of the strip-shaped water channel 4, so that heat dissipation of the conductive connecting piece 600 can be timely realized, and influence on the grounding effect of the signal main board 400 caused by influence of the conductive performance due to local heating is avoided.

As shown in fig. 3 to 6 and 10 to 11, the metal housing 100 includes two strip-shaped water channels 4, and two spaced strip-shaped ribs 5 are formed on the side a, and a recess groove recessed from the side a to the side B is formed between the inner side walls of the two spaced strip-shaped ribs 5, and is the first receiving groove 6. The outer side walls of the two spaced strip-shaped ribs 5 are respectively provided with a concave groove which is concave from the side A to the side B, the two concave grooves are second accommodating grooves 7, and the first accommodating grooves 6 and the second accommodating grooves 7 are spaced by the strip-shaped ribs 5; the first accommodating groove 6 is used for arranging a magnetic piece, and the second accommodating groove 7 is used for arranging the power device 500; the power device 500 is pressed against the outer side wall of the strip-shaped convex edge 5 through the pressing elastic sheet 700. The power device 500 can fully utilize the water channel wall to dissipate heat, increase the utilization rate of the water channel surface, and greatly reduce the space size of the fixed power device 500 by matching with the design of pressing the pressing spring 700.

As shown in fig. 1 and 5, a side a of the metal housing 100 close to the connector 800 is provided with a longitudinal partition wall 8; the longitudinal partition walls 8 extend upward and pass through the signal main board 400, and the longitudinal partition walls 8 form effective shielding and isolation of circuits and components on both sides thereof.

Based on the above arrangement, through the design of the bidirectional cavity of the metal shell 100, all the functional circuits are physically isolated, and the electromagnetic shielding effect is improved. Due to the fact that the transverse partition wall and the vertical partition wall are formed by the concave-convex structure of the metal shell 100 to replace the shielding case, the safety distance reserved for the shielding case originally is released, the space utilization rate is maximized, and the production and installation difficulty is reduced.

In the description of the present utility model, it should be noted that, unless explicitly stated and limited otherwise, the terms "disposed," "connected," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

The conductive connecting piece, the circuit board assembly structure and the vehicle-mounted charger provided by the utility model are described in detail, and specific examples are applied to illustrate the principle and the implementation of the utility model, and the description of the examples is only used for helping to understand the utility model and the core idea. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the utility model can be made without departing from the principles of the utility model and these modifications and adaptations are intended to be within the scope of the utility model as defined in the following claims.

Claims

1. Conductive connection piece, its characterized in that: the grounding device is used for connecting the metal shell and the circuit board to realize grounding of the circuit board;

2. The conductive connector of claim 1, wherein:

the conductive connecting piece is an aluminum alloy piece.

3. The conductive connector of claim 1, wherein:

4. Circuit board assembly structure, its characterized in that:

comprising a metal housing, a circuit board and a plurality of conductive connectors as claimed in claim 1;

5. The circuit board assembly structure of claim 4, wherein:

the metal shell is provided with a support column, and the printed substrate is erected on the support column;

6. The circuit board assembly structure of claim 5, wherein:

the height of the first column body is larger than the hole depth of the mounting hole;

7. The circuit board assembly structure of claim 4, wherein:

8. The circuit board assembly structure of claim 4, wherein:

9. The circuit board assembly structure of claim 8, wherein:

10. The vehicle-mounted charger is characterized in that: a circuit board assembly structure comprising any one of claims 4-9.

11. The vehicle-mounted charger of claim 10, wherein:

the circuit board in the metal shell comprises a signal main board and a plurality of filter boards;

the signal main board is positioned on the A side of the metal shell;

the filter plate is positioned on the side B of the metal shell;

at least the signal main board adopts the circuit board assembly structure.

12. The vehicle-mounted charger of claim 11, wherein:

the metal shell is provided with a plurality of strip-shaped water channels for storing cooling liquid;

13. The vehicle-mounted charger of claim 12, wherein:

the side A of the metal shell is provided with a first accommodating groove and a second accommodating groove which are recessed from the side A to the side B;

14. The vehicle-mounted charger of claim 13, wherein:

a connector is arranged on one side of the peripheral side wall of the metal shell;