Power device fixing structure of vehicle-mounted OBC

Abstract

The utility model relates to a power device fixing structure of a vehicle-mounted OBC. A power device fixing structure of a vehicle-mounted OBC comprises a power device and a ceramic chip which are fixed in a shell, the shell comprises a first shell part and a second shell part, heat conduction bonding layers are arranged on the two opposite sides of the ceramic chip in the first direction, the two sides of the ceramic chip are in contact with the second shell part and the power device through the heat conduction bonding layers respectively, and the ceramic chip is in contact with the second shell part and the power device through the heat conduction bonding layers. The first shell part is provided with a fixing seat, the fixing seat comprises a fixing part fixed with the first shell part and an elastic part extending along the second direction, the fixing part is provided with a positioning groove, and when the power device, the ceramic chip and the shell are fixed, one side of the power device in the first direction is connected with the elastic part, and the other side of the power device in the second direction is connected with the positioning groove. And the other side of the power device in the first direction is connected with the ceramic chip through a heat-conducting bonding layer. The utility model has the advantages that the assembly is more convenient, the production cost is lower, and the realization of light weight and small size is facilitated.

Description

Technical Field

[0001] This utility model relates to a power device fixing structure for an on-board computer (OBC). Background Technology

[0002] Chinese Patent Application No. 202021222364.1 discloses a power device assembly structure and an on-board charger, including a housing with an opening at one end, a fixed bracket fixedly disposed inside the housing, multiple power devices arranged in the fixed bracket and supported and positioned by the fixed bracket, a circuit board snapped onto the opening of the housing, the pins of the multiple power devices extending out of the circuit board and respectively connected and fixed to the circuit board; a heat-conducting component is provided inside the housing, the power devices are attached to the heat-conducting component, the heat-conducting component includes a ceramic sheet attached to the part of the housing where the cooling water channel is located; and an elastic pressure plate is also included, which is fixed by fastening screws.

[0003] In the above scheme, the elastic pressure plate mainly applies force to the fixed bracket to press the power device on the fixed bracket onto the ceramic plate, thereby realizing the positioning of the power device and facilitating the subsequent soldering of the power device pins to the circuit board.

[0004] The space occupied by the elastic clamping plates and those used for positioning and fixing them is relatively large, which is detrimental to the lightweighting and miniaturization of the vehicle OBC and the entire vehicle. The vehicle OBC houses numerous power devices, and installing each elastic clamping plate individually is cumbersome, leading to longer production times. If multiple elastic clamping plates are placed together (i.e., elastic strips), a strip fixing bracket is required to ensure the correct positioning of the strips, further increasing the number of components and making the elastic strip structure more complex. Simultaneously, it is difficult to control the lateral clamping force of the elastic clamping plates on the power devices, resulting in significant and uncontrollable mechanical stress on the power devices, affecting their lifespan. Utility Model Content

[0005] The purpose of this invention is to provide a power device fixing structure for an on-board OBC that is easier to assemble, has lower production costs, and facilitates lightweight and compact design.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a power device fixing structure for a vehicle-mounted OBC, comprising a power device and a ceramic plate fixed within a housing. The housing comprises a housing part located in a first direction of the power device and the ceramic plate, and a housing part located in a second direction of the power device and the ceramic plate. Thermally conductive adhesive layers are provided on opposite sides of the ceramic plate in the first direction. The ceramic plate contacts the housing part and the power device respectively through the thermally conductive adhesive layers. A fixing seat is provided at the housing part, comprising a fixing part fixed to the housing part and an elastic part extending along the second direction. A positioning groove for positioning the power device is provided at the fixing part away from the housing part. When the power device, the ceramic plate, and the housing are fixed, one side of the power device in the first direction is connected to the elastic part, and the other side of the power device in the first direction is connected to the ceramic plate through the thermally conductive adhesive layers.

[0007] When fixing the power device of this utility model, first lay or apply a thermally conductive adhesive layer on both sides of the ceramic sheet, then adhere the ceramic sheet to one part of the housing, then place the fixing seat on the other part of the housing, determine the relative position between the fixing seat and the other part of the housing by tooling or other structures, then insert the power device into the relief groove of the fixing seat, so that one side of the power device abuts against the elastic part of the fixing seat, and the other side of the power device contacts the thermally conductive adhesive layer on the ceramic sheet, then let it stand for a period of time or apply force to the fixing seat with tooling, and after the thermally conductive adhesive layer has cured, remove the relevant tooling and solder the circuit board to the pins of the power device, and finally fix the circuit board.

[0008] In the assembly process of the power device of this utility model, there is no need for fixing with elastic pressure plates or elastic pressure strips, nor is it necessary to set corresponding fastening screws and pressure strip fixing seats. Fewer parts need to be assembled during the assembly process, and there is no need for pre-assembly of the power device, reducing material costs, simplifying the assembly process, improving assembly efficiency and reducing production costs. At the same time, since there is no need to set fastening screws and pressure strip fixing seats, the housing can be made smaller, which is conducive to weight reduction and miniaturization. When the size of the housing does not need to be changed, the space where the pressure strip fixing seats and other parts were originally located can be used to place other parts.

[0009] The power device of this invention is fixed to the ceramic sheet using existing thermally conductive and adhesive materials. The elastic part of the fixing base has a certain elastic pressure, eliminating the need for continuous pressure from elastic strips or other components, thus preventing excessive mechanical stress on the power device. The thermally conductive adhesive layer can be made of an adhesive material with high thermal conductivity, such as thermally conductive adhesive silicone.

[0010] Preferably, the elastic part is sheet-shaped, and the root of the elastic part is connected and fixed to the side wall of the fixed part in the first direction.

[0011] The sheet-like elastic portion possesses excellent elastic properties. This shape provides sufficient elastic deformation capacity within a small space, allowing the elastic portion to effectively apply uniform clamping force to the power device. After the power device assembly is completed, the stress point of the elastic portion is located further away from its end, situated on the side wall of the fixing portion. This reduces the likelihood of breakage while ensuring elastic deformation of the elastic portion. Simultaneously, it allows space for a clearance groove, facilitating the assembly of the power device without requiring a greater overall thickness of the fixing portion.

[0012] Preferably, the root width of the elastic portion is smaller than the width of the elastic portion at the offset from the root, and the root of the elastic portion is provided with a through hole extending in a first direction.

[0013] The above-mentioned design reduces the stiffness at the root of the elastic part, making it more prone to elastic deformation when clamping force is applied to the power device. This allows for better adaptation to the dimensional tolerances and assembly errors of the power device. Simultaneously, the through-hole reduces the overall weight of the mounting bracket, contributing to the lightweight design of the vehicle-mounted OBC and the entire vehicle.

[0014] Preferably, the end face of the elastic portion along the first direction is in contact with the face along the second direction and is provided with a guide bevel or a rounded / chamfered treatment.

[0015] Guide bevels or rounded / chamfered corners facilitate the positioning and insertion of power devices during assembly, reduce collisions and friction between power devices and the elastic end, making the assembly process smoother, while also avoiding stress concentration and improving the structural strength and durability of the elastic end.

[0016] Preferably, the surface of the fixing part that contacts the power device has a positioning surface, which extends gradually from the elastic part side to the ceramic sheet side and away from the end side of the elastic part.

[0017] The design of the positioning surface better guides the positioning of the power device within the mounting bracket. When the power device is inserted along the positioning surface, the inclined structure of the surface allows for more accurate embedding into the positioning slot and ensures a more uniform clamping force applied by the elastic element.

[0018] Preferably, the fixing part of the fixing seat has at least two extension segments arranged side by side and extending along the second direction. The extension direction of the extension segments is the same as the extension direction of the elastic part, and the positioning groove is formed between two adjacent extension segments, the fixing part and the elastic part.

[0019] The positioning groove formed by multiple extension segments can achieve simultaneous positioning of multiple power devices, which can simplify the assembly process while ensuring higher positioning accuracy.

[0020] Preferably, the housing and the fixed part are provided with a positioning hole and a positioning post that cooperate with each other, and the positioning hole and positioning post extend along the second direction.

[0021] The engagement of the positioning holes and positioning pins ensures the installation accuracy of the mounting bracket within the housing, thereby guaranteeing the positioning accuracy of the power devices. Simultaneously, it restricts the movement of the mounting bracket along the first direction. After the power devices are fixed to the circuit board and the circuit board to the housing, the movement of the mounting bracket is further limited, eliminating the need for fasteners between the mounting bracket and the housing. The positioning pins and positioning holes can be clearance-fitted, further facilitating the assembly of the mounting bracket and simplifying the assembly process. Furthermore, due to the lightweight nature of the mounting bracket, it is unlikely to experience significant wobbling after being restrained by the power devices, eliminating the possibility of loosening and ensuring it does not affect the use of the vehicle's OBC (On-Board Computer).

[0022] During installation, the positioning pins can quickly and accurately guide the fixing seat to the correct position, avoiding installation errors such as offset or rotation of the fixing seat.

[0023] This invention has the advantages of being easier to assemble, having lower production costs, and being easier to achieve in terms of lightweight and compact size. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of one structure of the present utility model.

[0025] Figure 2 This is a cross-sectional view of the power device of this utility model after it has been fixed.

[0026] Figure 3 This is a schematic diagram of the structure of the fixing base of this utility model. Detailed Implementation

[0027] The present invention will now be further described with reference to the accompanying drawings and specific embodiments.

[0028] Depend on Figures 1 to 3 As shown, this embodiment discloses a power device fixing structure for a vehicle-mounted OBC, including a power device 100 and a ceramic plate 200 fixed within a housing. The housing includes a housing portion 31 located in a first direction between the power device 100 and the ceramic plate 200, and a housing portion 32 located in a second direction between the power device 100 and the ceramic plate 200. In this embodiment, the first direction refers to the front-to-back direction, and the second direction refers to the up-and-down direction. The housing portion 32 has a water channel (not shown in the figure) for cooling water to pass through. Thermally conductive adhesive layers are provided on both the front and rear opposite sides of the ceramic plate 200, and the front and rear sides of the ceramic plate 200 are in contact with the housing portion 32 and the power device 100 respectively through the thermally conductive adhesive layers.

[0029] A fixing seat 4 is provided at a housing part 31. The fixing seat 4 includes a fixing part 41 fixed to the housing part 31 and an elastic part 42 extending in a second direction. The fixing part 41 is provided with a positioning groove 40 for positioning the power device 100 at a distance away from the housing part 31. When the power device 100, the ceramic plate 200 and the housing are fixed, one side of the power device 100 in the first direction is connected to the elastic part 42, and the other side of the power device 100 in the first direction is connected to the ceramic plate 200 through a thermally conductive adhesive layer. The fixing part 41 of the fixing seat 4 has a plurality of extension segments 43 arranged side by side and extending in the second direction. The extension direction of the extension segments 43 is the same as the extension direction of the elastic part 42. The positioning groove 40 is formed between two adjacent extension segments 43, the fixing part 41 and the elastic part 42. The housing part 32 and the fixing part 41 are provided with a positioning hole and a positioning post 44 that cooperate with each other. The positioning hole and the positioning post 44 both extend in the vertical direction. The positioning hole is provided on the housing part 32, and the fixing part 41 is provided with a downwardly extending positioning post 44 on both the left and right sides.

[0030] The elastic part 42 is sheet-shaped. The root (lower end) of the elastic part 42 is connected and fixed to a side wall of the fixing part 41 along the first direction. The width of the root of the elastic part 42 is smaller than the width of the elastic part 42 at the offset from the root. The root of the elastic part 42 is provided with a through hole 421 extending along the first direction. The end (upper end) of the elastic part 42 is in contact with the surface along the first direction and is provided with a guide slope or rounded / chamfered treatment 420. The upper end surface of the fixing part 41 and the lower end surface of the power device 100 (when the power device pin is in the upper position) both have inclined positioning surfaces 400. The positioning surfaces 400 gradually extend downward from the side of the elastic part 42 to the side of the ceramic sheet 200. In order to further facilitate the deformation of the elastic part 42 when subjected to force, a groove 45 extending along the length direction of the fixing part 41 is provided on the upper end surface of the fixing part 41 near the elastic part 42.

[0031] When fixing the power device 100 in this embodiment, firstly, a thermally conductive adhesive layer is laid or applied to both sides of the ceramic sheet 200. In this embodiment, the thermally conductive adhesive layer uses thermally conductive adhesive silicone with a thermal conductivity of 1.8 W / mK. Then, the ceramic sheet 200 is adhered to the housing part 31 of the housing. Next, the fixing seat 4 is placed on the housing part 32. The position of the fixing seat 4 is determined by inserting the positioning post 44 into the positioning hole. Then, the power device 100 is inserted into the relief groove of the fixing seat, so that one side of the power device 100 abuts against the elastic part 42 of the fixing seat 4. Make the other side of the power device 100 contact the thermally conductive adhesive layer on the ceramic sheet 200, then let it stand for a period of time or use a tool to apply force to the fixing seat. After the thermally conductive adhesive layer has cured, remove the relevant tool and solder the circuit board to the pins of the power device 100. Finally, fix the circuit board. At this time, the fixing seat 4 is restricted between the housing and the power device 100. Since the positioning surfaces are in contact with each other and the positioning post 44 is restricted in the positioning hole, the fixing seat 4 will not shake much. The fixing seat 4 and the housing do not need to be fixed with fasteners, glue, or welding.

[0032] This embodiment has the advantages of easier assembly, lower production cost, and easier implementation of lightweight and small size.

Claims

1. A power device fixing structure for a vehicle-mounted OBC, comprising a power device and a ceramic plate fixed within a housing, characterized in that: The housing includes a housing part located in a first direction of the power device and the ceramic plate, and a housing part located in a second direction of the power device and the ceramic plate. Thermally conductive adhesive layers are provided on opposite sides of the ceramic plate in the first direction. The ceramic plate's two sides are in contact with the housing part and the power device respectively through the thermally conductive adhesive layers. A fixing seat is provided at the housing part, comprising a fixing portion fixed to the housing part and an elastic portion extending along the second direction. A positioning groove for positioning the power device is provided at the fixing portion away from the housing part. When the power device, the ceramic plate, and the housing are fixed, one side of the power device in the first direction is connected to the elastic portion, and the other side of the power device in the first direction is connected to the ceramic plate through the thermally conductive adhesive layers.

2. The power device fixing structure of the vehicle-mounted OBC according to claim 1, characterized in that: The elastic part is sheet-like, and the root of the elastic part is connected and fixed to the side wall of the fixed part in the first direction.

3. The power device fixing structure of the vehicle-mounted OBC according to claim 2, characterized in that: The root width of the elastic part is smaller than the width of the elastic part at the offset from the root, and the root of the elastic part is provided with a through hole extending in a first direction.

4. The power device fixing structure of the vehicle-mounted OBC according to claim 1, 2, or 3, characterized in that: The end face of the elastic part along the first direction is in contact with the face along the second direction and is provided with a guide bevel or a rounded / chamfered treatment.

5. The power device fixing structure of the vehicle-mounted OBC according to claim 1, 2, or 3, characterized in that: The surface of the fixing part that contacts the power device has a positioning surface, which extends gradually from the elastic part side to the ceramic plate side and away from the end side of the elastic part.

6. The power device fixing structure of the vehicle-mounted OBC according to claim 1, 2, or 3, characterized in that: The fixing part of the fixing seat has at least two extension segments arranged side by side and extending along a second direction. The extension direction of the extension segments is the same as the extension direction of the elastic part. The positioning groove is formed between two adjacent extension segments, the fixing part and the elastic part.

7. The power device fixing structure of the vehicle-mounted OBC according to claim 1, 2, or 3, characterized in that: The housing and the fixed part are provided with a positioning hole and a positioning post that cooperate with each other, and the positioning hole and positioning post extend along the second direction.

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