Power device assembling auxiliary device for vehicle-mounted OBC

Abstract

The utility model relates to a power device assembling auxiliary device for a vehicle-mounted OBC. A power device assembly auxiliary device for a vehicle-mounted OBC comprises a positioning box, a containing cavity is formed in the positioning box, a plurality of through grooves are formed in one side of the positioning box side by side and communicate with the containing cavity, and the positioning box comprises a first box body and a second box body which are oppositely arranged front and back; the first box body and the second box body are spliced together to form the containing cavity, a first positioning groove used for positioning a power device and a second positioning groove used for positioning a ceramic chip are formed in the side, facing the second box body, of the first box body, and the first positioning groove is communicated with the passing groove. The second box body is provided with a passing groove, the passing groove is provided with an opening facing the side of the second box body, the second positioning groove is closer to the second box body than the first positioning groove, the width of the second positioning groove is the same as that of the ceramic chip, the side, facing the first box body, of the second box body is provided with a third positioning groove, and an elastic pad is placed in the third positioning groove. The utility model has the advantages that the relative position between the ceramic chip and the power device can be ensured to be better, and the welding of the pins of the power device and the circuit board is facilitated.

Description

Technical Field

[0001] This utility model relates to an auxiliary device for assembling power devices for vehicle-mounted OBCs. Background Technology

[0002] On-board chargers (OBCs) typically consist of a housing containing several vertically positioned heat dissipation sections with water-cooling channels. Power devices are positioned close to these heat dissipation sections with their pins facing upwards. A circuit board is then mounted on top of the housing, with other components on the board and those installed within the housing located to the sides of the power devices and the heat dissipation sections. Examples of OBCs disclosed in Chinese patents with application numbers 202021222364.1, 202323573473.4, and 202411353246.7 illustrate this. To improve heat dissipation, ceramic plates are often placed on the surface of the heat dissipation sections, allowing the power devices to directly contact and dissipate heat.

[0003] When assembling the power devices of the on-board charger in the above-mentioned scheme, whether the power devices are fixed to the housing first and then the pins of the power devices are soldered to the circuit board, or the power devices are soldered to the circuit board first and then the power devices are assembled, the pins of the power devices need to be aligned with the holes on the circuit board one by one, which is quite troublesome. Moreover, the positioning slot of the power device positioning seat is larger than the size of the power device, and the power device is not tightly fitted in the positioning slot. Therefore, it is difficult to ensure the tilt and rotation of all power device insertions. This will cause the final position of the power device to deviate from the set position. That is, there is a certain tilt angle between the side of the power device and the ceramic plate surface of the heat dissipation part of the housing, resulting in poor heat dissipation. Utility Model Content

[0004] The purpose of this invention is to provide an auxiliary device for assembling power devices in an on-board computer (OBC) that can ensure a good relative position between the ceramic plate and the power device, and facilitate the soldering of the power device pins to the circuit board.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: an auxiliary device for assembling power devices for vehicle-mounted OBCs, comprising a positioning box, wherein the positioning box has an internal cavity for accommodating power devices and ceramic plates, and a plurality of parallel through slots on one side of the positioning box for the pins of the power devices to pass through, the through slots communicating with the cavity. The positioning box comprises a first box body and a second box body arranged opposite to each other, the first box body and the second box body being detachably fixed and assembled together by fasteners to form the cavity. The first box body has a first positioning slot for positioning the power devices and a second positioning slot for positioning the ceramic plates on the side facing the second box body, the first positioning slot communicating with the through slots, the through slots having an opening facing the side of the second box body, the second positioning slot being closer to the second box body than the first positioning slot, the width of the second positioning slot being the same as the width of the ceramic plates, and a third positioning slot on the side of the second box body facing the first box body, wherein an elastic pad is placed in the third positioning slot.

[0006] First, place the power devices one by one into the first positioning groove, and apply adhesive to the side of the ceramic sheet closest to the power device. Then, place the ceramic sheet into the second positioning groove. The position of the power device is determined by the first positioning groove and the position of the ceramic sheet is determined by the wall of the second positioning groove adhering to the side wall of the ceramic sheet. Then, assemble the first box and the second box to deform the elastic pad. As the first box and the second box are fixed, the elastic pad will push the ceramic sheet against the power device. Hold the positioning box for a period of time, then disassemble the positioning box and remove the power device and ceramic sheet that are glued together.

[0007] This invention eliminates the need for a power device positioning base to position the power device. After assembling the power device and ceramic plate, the ceramic plate can be attached to the heat dissipation part of the vehicle OBC housing. Since the power devices are already positioned, the circuit board can be placed directly at the housing opening. After one-time alignment, all pins can be inserted, and finally, the pins can be soldered to the circuit board.

[0008] This invention ensures effective contact between the power device and the ceramic plate. By allowing the ceramic plate to be directly attached to the power device, applying pressure to the ceramic plate with an elastic pad, and positioning the power device and ceramic plate using a first and second positioning groove, the relative positions of the bonded power device and ceramic plate are guaranteed, facilitating subsequent soldering to the circuit board. Furthermore, using this invention and adhesive to connect the power device and ceramic plate eliminates the need for internal power device positioning seats or other components. The elastic pad can be a rubber pad or a sponge pad. Fasteners are used to secure the first and second housings together, allowing for the deformation of the elastic pad.

[0009] Preferably, the depth of the first positioning groove is less than the thickness of the power device, and the depth of the second positioning groove is greater than the thickness of the ceramic sheet. That is, the power device portion is located within the second positioning groove, which facilitates the assembly of the power device and the clamping of the ceramic sheet.

[0010] Preferably, the bottom of the through slot is closer to the second housing than the bottom of the first positioning slot. When the power device is located in the first positioning slot and its end face is in contact with the bottom of the first positioning slot, the pin sidewall of the power device is in contact with the bottom of the through slot. The contact between the bottom of the through slot and the pin of the power device further enhances its positioning function.

[0011] Preferably, the second housing has supporting protrusions at both ends and is fixed to the first housing. When the second housing is fixed to the first housing, a through clearance groove is formed between the middle of the second housing and the first housing, and the clearance groove communicates with the third positioning groove. The detachable fixing point is offset from the first and second positioning grooves to avoid excessive pressure between the power device and the ceramic plate.

[0012] Preferably, the first box body has an annular barrier extending towards the second box body in the middle. The annular barrier forms the first positioning groove and the second positioning groove. The through groove penetrates one side wall of the annular barrier. When the second box body is fixed to the first box body, the annular barrier is located in the clearance groove.

[0013] By setting up an annular enclosure to form the first and second positioning grooves, the manufacturing of this utility model is facilitated. Furthermore, compared to carving grooves in thicker materials, forming a grooved annular enclosure not only facilitates production but also facilitates the subsequent assembly of the first and second housings. The annular enclosure is located within the clearance groove, meaning the annular enclosing end face does not contact the second housing, thus preventing excessive pressure on the power devices.

[0014] Preferably, the portion of the annular enclosure having the passage groove includes an inner ring and an outer ring, the thickness of the inner ring being different from the thickness of the outer ring, the thickness of the inner ring or the outer ring being less than the thickness of the sidewall of the annular enclosure deviating from the passage groove, and the end face of the annular enclosure deviating from the inner ring or the outer ring being on the same plane.

[0015] The smaller thickness of the inner or outer ring reduces the rigidity of this area, facilitating shaping and ensuring that the annular enclosure deviates from the opposite sides of the through groove to form a flat second positioning groove wall, which is convenient for positioning with the ceramic sheet. Simultaneously, the reduced thickness of the inner or outer ring decreases the contact between the first and second housings, ensuring effective compression of the power device by the elastic pad inside the second housing, and guaranteeing effective contact between the power device and the ceramic sheet.

[0016] Preferably, the first housing has a through-hole component retrieval auxiliary groove on the other side corresponding to the through groove, and the component retrieval auxiliary groove is connected to the second positioning groove. After the circuit board and power device are soldered, the component retrieval auxiliary groove can be inserted to facilitate the movement of the ceramic plate, thereby facilitating the removal of the power device and the ceramic plate.

[0017] Preferably, both the first and second box bodies are provided with cooperating positioning protrusions and positioning grooves at their left and right ends. The first and second box bodies are detachably fixed by fasteners that pass through the positioning protrusions and positioning grooves. The cooperation of the positioning protrusions and positioning grooves ensures accurate positioning of the first and second box bodies during assembly, preventing misalignment.

[0018] Preferably, the first housing has several strip-shaped grooves that communicate with the first positioning groove, and the bottom of the strip-shaped grooves is further away from the second housing than the first positioning groove. The extension direction of the through groove is perpendicular to the extension direction of the strip-shaped groove. This arrangement reduces the contact area between the power device and the first housing, facilitating the placement and removal of the power device.

[0019] This invention has the advantages of ensuring a good relative position between the ceramic plate and the power device, and facilitating the soldering of the power device pins to the circuit board. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of one structure of the present utility model.

[0021] Figure 2 This is a cross-sectional view of the present invention.

[0022] Figure 3 This is a schematic diagram of the structure of the first box body of this utility model.

[0023] Figure 4 This is a schematic diagram of the structure of the second box body of this utility model. Detailed Implementation

[0024] The present invention will now be further described with reference to the accompanying drawings and specific embodiments.

[0025] Depend on Figure 1 As shown, this embodiment discloses an auxiliary device for assembling power devices for vehicle-mounted OBCs, including a positioning box. The positioning box has a cavity for accommodating power devices 100 and ceramic plates 200. One side of the positioning box has several parallel passage slots 10 for the pins 101 of the power devices 100 to pass through. The passage slots 10 communicate with the cavity. The positioning box includes a first box body 1 and a second box body 2 arranged opposite to each other. The first box body 1 and the second box body 2 are detachably fixed and assembled together by fasteners to form the cavity.

[0026] Depend on Figure 2 and Figure 3 As shown, the first housing 1 has an annular barrier 11 extending towards the second housing 2 on the side facing the second housing 2. The inner edge of the annular barrier 11 forms a first positioning groove 111 for positioning the power device 100 and a second positioning groove 112 for positioning the ceramic sheet 200. The first positioning groove 111 is connected to the through groove 10. The depth of the first positioning groove 111 is less than the thickness of the power device 100, and the depth of the second positioning groove 112 is greater than the thickness of the ceramic sheet 200. The second positioning groove 112 is closer to the second housing 2 than the first positioning groove 111, and the width of the second positioning groove 112 is the same as the width of the ceramic sheet 200. The second housing 2 has a third positioning groove 113 on the side facing the first housing 1, and an elastic pad 114 is placed in the third positioning groove 113.

[0027] In this embodiment, the inclination angle of the first positioning groove 111 near the through groove 10 is the same as the inclination angle of the end face 102 near the pin end of the main body of the power device 100. The number of through grooves 10 is the same as the number of pins 101. The width of the inner end of the through groove 10 is the same as the width of the root end of the pin 101. The power device 100 is positioned by contact between its inclined surface and the wall of the first positioning groove, and by contact between the side of the pin and the wall of the through groove. The first housing 1 has two strip grooves 12, both of which are connected to the first positioning groove 111. The bottom of the strip grooves 12 is further away from the second housing 2 than the first positioning groove 111. The extension direction of the through groove 10 is perpendicular to the extension direction of the strip grooves 12. The two strip grooves 12 are located at opposite ends of the first positioning groove 111.

[0028] The annular enclosure 11 has a passage groove 10 on one side along its length, with an opening facing the second housing 2. The bottom of the passage groove 10 is closer to the second housing 2 than the bottom of the first positioning groove 111. When the power device 100 is located within the first positioning groove 111 and its end face is in contact with the bottom of the first positioning groove 111, the sidewall of the pin 101 of the power device 100 is in contact with the bottom of the passage groove 10. The portion of the annular enclosure 11 with the passage groove 10 includes an inner ring portion 110 and an outer ring portion 120. The thickness of the inner ring portion 110 is less than the thickness of the outer ring portion 120, and the end faces of the annular enclosure 11 that are offset from the inner ring portion 120 are all on the same plane. The other side of the annular enclosure 11, corresponding to the other side of the passage groove 10, has a through-hole retrieval auxiliary groove 13, which communicates with the second positioning groove 112.

[0029] Depend on Figures 1 to 4As shown, the second box 2 has supporting protrusions 21 at both ends and is fixed to the first box 1. The two supporting protrusions 21 of the second box 2 form a through clearance groove, which communicates with the third positioning groove 113. When the second box 2 is fixed to the first box 1, the annular barrier 11 is located in the clearance groove. The first box 1 has positioning protrusions 14 at both ends. The supporting protrusions 21 have positioning grooves 22 that cooperate with the positioning protrusions 14. The end face of the positioning protrusions 14 and the end face of the annular barrier 11 are on the same plane. When the first box 1 and the second box 2 are detachably fixed together by fasteners, the fasteners pass through the positioning protrusions 14 and the positioning grooves 22.

[0030] This invention has the advantages of ensuring a good relative position between the ceramic plate and the power device, and facilitating the soldering of the power device pins to the circuit board.

Claims

1. An auxiliary device for assembling power devices for vehicle-mounted OBCs, characterized in that: The device includes a positioning box, which has an internal cavity for accommodating power devices and ceramic plates. One side of the positioning box has several parallel passage slots for the pins of the power devices to pass through, and these passage slots communicate with the cavity. The positioning box includes a first box body and a second box body arranged opposite each other. The first box body and the second box body are detachably fixed and assembled together by fasteners to form the cavity. The first box body has a first positioning groove for positioning power devices and a second positioning groove for positioning ceramic sheets on the side facing the second box body. The first positioning groove is connected to the through groove, which has an opening facing the second box body. The second positioning groove is closer to the second box body than the first positioning groove. The width of the second positioning groove is the same as the width of the ceramic sheet. The second box body has a third positioning groove on the side facing the first box body, and an elastic pad is placed in the third positioning groove.

2. The power device assembly auxiliary device for vehicle-mounted OBC according to claim 1, characterized in that: The depth of the first positioning groove is less than the thickness of the power device, and the depth of the second positioning groove is greater than the thickness of the ceramic sheet.

3. The auxiliary device for assembling power devices for vehicle-mounted OBC according to claim 1 or 2, characterized in that: The bottom of the through slot is closer to the second housing than the bottom of the first positioning slot. When the power device is located in the first positioning slot and the end face of the power device is in contact with the bottom of the first positioning slot, the pin sidewall of the power device is in contact with the bottom of the through slot.

4. The auxiliary device for assembling power devices for vehicle-mounted OBC according to claim 1 or 2, characterized in that: The second box has supporting protrusions at both ends and is fixed to the first box. When the second box is fixed to the first box, a through clearance groove is formed between the middle of the second box and the first box, and the clearance groove is connected to the third positioning groove.

5. The power device assembly auxiliary device for vehicle-mounted OBC according to claim 4, characterized in that: The first box body has an annular barrier extending towards the second box body in the middle. The annular barrier forms the first positioning groove and the second positioning groove. The through groove penetrates one side wall of the annular barrier. When the second box body is fixed to the first box body, the annular barrier is located in the clearance groove.

6. The power device assembly auxiliary device for vehicle-mounted OBC according to claim 5, characterized in that: The annular enclosure includes an inner ring and an outer ring at the passage slot. The thickness of the inner ring is different from that of the outer ring. The thickness of the inner ring or the outer ring is less than the thickness of the side wall of the annular enclosure that deviates from the passage slot. The end face of the annular enclosure that deviates from the inner ring or the outer ring is on the same plane.

7. The power device assembly auxiliary device for vehicle-mounted OBC according to claim 1 or 2, characterized in that: The first box body has a through-hole retrieval auxiliary groove on the other side of the through groove, and the retrieval auxiliary groove is connected to the second positioning groove.

8. The power device assembly auxiliary device for vehicle-mounted OBC according to claim 1 or 2, characterized in that: The first and second boxes are provided with mutually cooperating positioning protrusions and positioning grooves at their left and right ends. The first and second boxes are detachably fixed by fasteners that pass through the positioning protrusions and positioning grooves.

9. The power device assembly auxiliary device for vehicle-mounted OBC according to claim 1 or 2, characterized in that: The first box body is provided with a plurality of strip grooves, the strip grooves are connected to the first positioning groove, and the bottom of the strip grooves is farther away from the second box body than the first positioning groove, and the extension direction of the through groove is perpendicular to the extension direction of the strip groove.

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