Vehicle-mounted electronic device

Abstract

A vehicle-mounted electronic device is provided with: a connector into which a holder is inserted; a circuit board on which the connector is mounted; a housing that accommodates the circuit board and the connector such that an opening of the connector into which the holder is inserted is exposed to the outside; and a drainage mechanism which is provided so as to face an energizing part through which electric current flows, and which discharges water to the outside of the housing.

Description

Technical Field

[0001] The present invention relates to in-vehicle electronic devices. Background Art

[0002] JP2014-003206A discloses an in-vehicle electronic device disposed in an engine room of a vehicle. The in-vehicle electronic device includes a circuit board provided with an input / output connector, a base (lower housing) for fixing the circuit board, a cover (upper housing) fixed to the base and covering the circuit board in such a manner that a connection portion of the connector is exposed to the outside, and a waterproof seal for fixing and sealing the base and the cover. Summary of the Invention

[0003] In addition, when the in-vehicle electronic device is disposed outside the vehicle compartment such as in the engine room of the vehicle, a structure including a waterproof seal is adopted to prevent water from entering the inside as in the in-vehicle electronic device described in JP2014-003206A. When the in-vehicle electronic device is disposed inside the vehicle compartment, a structure for preventing water from entering the inside is mostly not adopted.

[0004] However, even when the in-vehicle electronic device is disposed inside the vehicle compartment, for example, when the vehicle is flooded, water may sometimes enter the inside of the in-vehicle electronic device. If water that has entered the in-vehicle electronic device remains inside when the vehicle has recovered from the flooded state, leakage current may flow in a path where it should not flow.

[0005] Therefore, even when the in-vehicle electronic device is disposed inside the vehicle compartment, a structure for preventing water from entering the inside is sometimes adopted. In the structure for preventing water from entering the inside, not only a waterproof seal needs to be provided in the housing to prevent water from entering the housing, but also a rubber seal or the like needs to be provided to prevent water from entering through the connector pins due to capillary action. Thus, especially when the number of connector pins is large, the in-vehicle electronic device may be enlarged.

[0006] The present invention has been made in view of such technical problems, and an object thereof is to suppress the generation of leakage current and suppress the enlargement of the vehicle electronic device.

[0007] According to an aspect of the present invention, an in-vehicle electronic device includes: a connector into which a holder is inserted; a circuit board to which the connector is mounted; a housing that houses the circuit board and the connector in such a manner that an opening portion of the connector into which the holder is inserted is exposed to the outside; and a drainage mechanism that is disposed to face a current-carrying portion through which current flows and discharges water to the outside of the housing. Brief Description of the Drawings

[0008] Figure 1It is a perspective view of an in-vehicle electronic device according to an embodiment of the present invention.

[0009] Figure 2 It is an exploded perspective view of the in-vehicle electronic device.

[0010] Figure 3 It is a top view showing a state where the upper housing of the in-vehicle electronic device is removed.

[0011] Figure 4 It is a perspective view showing an enlarged structure near the connector of the in-vehicle electronic device.

[0012] Figure 5 It is viewed obliquely from below Figure 4 It is a perspective view of the structure near the connector shown.

[0013] Figure 6 It is a perspective view of the lower housing of the in-vehicle electronic device.

[0014] Figure 7 It is Figure 3 A cross-sectional view taken along line VII-VII of

[0015] Figure 8 It is a cross-sectional view showing a state where a retainer is inserted into the connector.

[0016] Figure 9 It is a perspective view of the lower housing of an in-vehicle electronic device according to a modified example of an embodiment of the present invention.

[0017] Figure 10 It is a view showing the same cross-section of the in-vehicle electronic device according to the modified example as Figure 7 the same.

[0018] Figure 11 It is a perspective view showing a first modified example of a drainage portion provided in the lower housing.

[0019] Figure 12 It is a perspective view showing a second modified example of a drainage portion provided in the lower housing.

[0020] Figure 13 It is a perspective view showing a third modified example of a drainage portion provided in the lower housing. Detailed Embodiments

[0021] Hereinafter, while referring to the attached Figure 1 the embodiments of the present invention will be described.

[0022] First, with reference to Figures 1 to 3 the overall structure of an in-vehicle electronic device (hereinafter, simply referred to as "electronic device") 100 according to an embodiment of the present invention will be described.

[0023] Figure 1 This is a perspective view of the electronic device 100. Figure 2 This is an exploded perspective view of the electronic device 100. Figure 3 This is a top view showing the state where the upper housing 11 of the electronic device 100 has been removed.

[0024] The electronic device 100 is mounted on a vehicle and is disposed inside a vehicle compartment (not shown). The electronic device 100 is, for example, a battery management system (BMS) that controls a drive battery for an electric vehicle (EV), a hybrid electric vehicle (HEV), or the like.

[0025] As Figure 1 and Figure 2 shown, the electronic device 100 includes a housing 10, a circuit board 20, a connector 30, and a drainage mechanism 50 (see Figure 2 ).

[0026] The housing 10 houses the circuit board 20 and the connector 30. The housing 10 has an upper housing 11 and a lower housing 12.

[0027] The upper housing 11 is located above the circuit board 20. The upper housing 11 is formed in a substantially box shape. The upper housing 11 covers the upper surface of the circuit board 20. A plurality (six in this case) of notches 11a are formed in the upper housing 11 for exposing the opening 32 of the connector 30 to the outside of the housing 10.

[0028] The lower housing 12 is located below the circuit board 20. The lower housing 12 is formed in a substantially flat plate shape. The lower housing 12 covers the lower surface of the circuit board 20. The lower housing 12 is bolted to the upper housing 11 with the circuit board 20 sandwiched therebetween.

[0029] As Figure 2 shown, the lower housing 12 has a flat plate portion 12a and a plurality (six in this case) of protrusions 12b that support the circuit board 20. The protrusions 12b are formed in a substantially cylindrical shape, and internal threads for bolt fastening are formed on the inner circumference (not shown). The lower housing 12 supports the circuit board 20 such that the circuit board 20 is located on the upper surface of the protrusions 12b. A drainage portion 54 of the drainage mechanism 50 described later is provided on the flat plate portion 12a.

[0030] The circuit board 20 is formed in a substantially flat plate shape. A circuit pattern (not shown) is formed on the circuit board 20, and various electronic components (not shown) required for the electronic device 100 to perform control are mounted thereon. The circuit board 20 is supported on the protrusions 12b of the lower housing 12 and is fastened and mounted to the protrusions 12b using bolts (not shown). Thus, the circuit board 20 is supported on the lower housing 12 with a space in the height direction from the flat plate portion 12a.

[0031] As Figure 3As shown, the connector 30 is mounted on the upper surface of the circuit board 20. A plurality (six in this case) of connectors 30 are provided along the outer peripheral edge of the circuit board 20. After each connector 30 is inserted, a holder 40 (refer to Figure 8 ) is inserted. The connector 30 is used to electrically connect the circuit board 20 and other external electronic devices (not shown).

[0032] Next, with reference to Figures 3 to 10 , the structures of the connector 30, the holder 40, and the drainage mechanism 50 will be described.

[0033] Figure 4 is a perspective view showing an enlarged structure near the connector 30 of the electronic device 100. Figure 5 is a perspective view when observing the structure near the connector 30 shown in Figure 4 from obliquely below. Figure 6 is a perspective view of the lower housing 12 of the electronic device 100. Figure 7 is Figure 3 a cross-sectional view taken along line VII-VII of Figure 8 is a cross-sectional view showing a state where the holder 40 is inserted into the connector 30. Figure 9 is a perspective view of the lower housing 12 of the electronic device 100 of a modified example. Figure 10 is a view showing the same cross-section of the electronic device 100 of the modified example as that of Figure 7 .

[0034] As shown in Figure 4 and Figure 5 , the connector 30 has a connector body 31 and a plurality of connector pins 33.

[0035] The connector body 31 is formed of a resin material. The connector body 31 is formed in a substantially rectangular parallelepiped shape. The connector body 31 has an opening 32.

[0036] The opening 32 is opened in a substantially rectangular shape so as to be exposed to the outside of the housing 10. The holder 40 (refer to Figure 8 ) is inserted into the opening 32.

[0037] As shown in Figure 4 , the connector pins 33 project toward the opening 32 inside the connector body 31. The connector pins 33 are arranged in a matrix of n rows × m columns (n and m are positive integers). As shown in Figure 7 , one end 33a of the connector pin 33 is electrically connected to a circuit pattern formed on the upper surface of the circuit board 20. As shown in Figure 8 , the other end 33b of the connector pin 33 is electrically connected to other external electronic devices via the holder 40 in a state where the holder 40 is inserted into the connector 30.

[0038] As Figure 8 shown, the retainer 40 has a retainer body 41 as the main body portion, a first terminal portion 42, a second terminal portion 43, and a fastening portion 44.

[0039] The retainer body 41 is formed in a substantially rectangular parallelepiped shape that is one size smaller than the connector body 31. The retainer body 41 is inserted into the connector 30. The retainer body 41 has a recess 41a for inserting the fastening portion 44 at substantially the center in the longitudinal direction.

[0040] The first terminal portion 42 is disposed within the retainer body 41. The first terminal portion 42 is electrically connected to the wiring harness 45.

[0041] The second terminal portion 43 is electrically connected to the connector pin 33 within the connector 30 in a state where the retainer 40 is inserted into the connector 30 ( Figure 8 the state shown).

[0042] The fastening portion 44 presses the first terminal portion 42 against the second terminal portion 43 in a state where it is installed in the recess 41a of the retainer body 41 ( Figure 8 the state shown). That is, the fastening portion 44 fixes the first terminal portion 42 and the second terminal portion 43 in a contacting state.

[0043] Here, for example, when the vehicle is flooded, water may enter the interior of the electronic device 100. If the water that has entered the electronic device 100 remains inside when the vehicle has recovered from the flooded state, leakage current may flow in a path where it should not flow. Therefore, in the electronic device 100, a drainage mechanism 50 is provided to prevent the water that has entered from remaining inside when the vehicle has recovered from the flooded state.

[0044] As Figure 7 shown, the drainage mechanism 50 is provided so as to face the energized portion through which current flows, and discharges water to the outside of the housing 10. Here, the connector pin 33 of the connector 30 and the first terminal portion 42 of the retainer 40 correspond to the energized portion. The drainage mechanism 50 has a first drainage hole 51, a second drainage hole 52, a third drainage hole 53, and a drainage portion 54.

[0045] As Figure 4 shown, the first drainage hole 51 is provided in the connector body 31 of the connector 30. The first drainage hole 51 is formed in a long hole shape along the direction in which the connector pins 33 are arranged. The first drainage hole 51 is divided into a plurality of (here, three) in a manner of being arranged in the longitudinal direction within the connector 30. As Figure 7 shown, the first drainage hole 51 is provided so as to penetrate the lower surface of the connector 30 vertically. The first drainage hole 51 discharges the water that has entered the connector 30 to the outside by gravity.

[0046] Thus, since the first drain hole 51 is provided on the lower surface of the vertically penetrating connector 30, water that has entered the connector 30 can be guided and discharged to the outside of the connector 30 by gravity. Therefore, it is possible to suppress the water that has entered from staying inside the connector 30 when the vehicle has recovered from a flooded state.

[0047] As Figure 8 shown, the first drain hole 51 is provided so as to open at a first position 58 and a second position 59. The first position 58 is a position where the first drain hole 51 communicates with the docking surface between the top end portion of the holder 40 and the inner surface of the connector 30, and the second position 59 is a position where the first drain hole 51 communicates with the opposing surface between the holder main body 41 and the fastening portion 44. In addition, the first drain hole 51 may be provided so as to open only at the first position 58 or the second position 59. That is, the first drain hole 51 is provided so as to open at at least one of the first position 58 and the second position 59.

[0048] Thus, since the first drain hole 51 opens at at least one of the first position 58 and the second position 59 where it is not easy to discharge water to the outside when water enters the connector 30, it is possible to guide and discharge the water that has stayed in the connector pin 33 and the first terminal portion 42 through which current flows inside the electronic device 100 to the outside. Therefore, it is possible to suppress the water that has entered from staying near the connector pin 33 and the first terminal portion 42 when the vehicle has recovered from a flooded state.

[0049] As Figure 5 shown, the second drain hole 52 is provided in the circuit board 20. The second drain hole 52 is formed in the same elongated hole shape as the first drain hole 51. The second drain hole 52 is formed in a shape substantially the same as the first drain hole 51. As Figure 7 and Figure 8 shown, the second drain hole 52 is provided at a position that communicates with the first drain hole 51 of the connector 30 in the vertical direction. The second drain hole 52 is provided so as to vertically penetrate the circuit board 20. The second drain hole 52 discharges the water discharged from the connector 30 via the first drain hole 51 to the outside by gravity.

[0050] Thus, since the second drain hole 52 that vertically penetrates the circuit board 20 is provided, it is possible to guide and discharge the water discharged from inside the connector 30 through the first drain hole 51 to below the circuit board 20 by gravity. Therefore, it is possible to suppress the water that has entered from staying on the circuit board 20 when the vehicle has recovered from a flooded state.

[0051] As Figure 6 and Figure 7As shown, a drainage portion 54 is formed in the lower housing 12. The drainage portion 54 guides the water discharged from the second drainage hole 52 and the third drainage hole 53 to the outside of the housing 10. The drainage portion 54 is an inclined surface that opens to the side of the housing 10. The drainage portion 54 is inclined so as to gradually move away from the circuit board 20 toward the side of the housing 10, that is, the opening area gradually increases toward the side of the housing 10.

[0052] In this way, since the drainage portion 54 is provided in the lower housing 12, the water guided to the lower side of the circuit board 20 through the first drainage hole 51 and the second drainage hole 52 can be guided to the outside of the housing 10 and discharged by gravity. Therefore, it is possible to prevent the water that has entered from staying inside the housing 10 when the vehicle returns from the flooded state.

[0053] As described above, the electronic device 100 includes a drainage mechanism 50 that is provided so as to face the connector pins 33 and the first terminal portion 42 through which the current of the circuit board 20 flows, and is used to discharge water to the outside of the housing 10. Therefore, even if water enters the inside of the housing 10, the water staying in the energized portions (connector pins 33 and the first terminal portion 42) through which the current of the circuit board 20 flows will be discharged to the outside of the housing 10 through the drainage mechanism 50. Therefore, it is possible to suppress the generation of leakage current and suppress the enlargement of the electronic device 100.

[0054] In addition, when the vehicle returns from the flooded state and the operator removes the retainer 40 from the connector 30 for disassembly, the water that has entered the connector 30 has been guided and discharged outside the connector 30. Therefore, the operator can perform the operation safely.

[0055] In addition, as Figure 9 and Figure 10 shown in the modified example, the drainage portion 54 may also have a plurality of slit portions 55 provided so as to open intermittently.

[0056] The slit portions 55 are respectively formed between a plurality of claw portions 56 that intermittently fold back at the opening end of the drainage portion 54. In this way, by forming the drainage portion 54 with a plurality of slit portions 55, the opening area of the drainage portion 54 becomes smaller, so it is possible to prevent the operator's fingers, etc. from entering from the outside. Therefore, it is possible to prevent the operator from touching the energized portions inside the housing 10.

[0057] As Figure 3 shown, the third drainage hole 53 is provided between the connection portions (connection portions between the end portion 33a and the circuit pattern of the circuit board 20) where the connector pins 33 of a pair of adjacent connectors 30 are electrically connected to the circuit board 20. Here, one end portion 33a of the connector pin 33 (refer to Figure 7 and Figure 8)It is equivalent to the energized part. The third drain hole 53 is provided so as to penetrate the circuit board 20 vertically. The third drain hole 53 discharges the water remaining on the circuit board 20 to the outside by gravity.

[0058] In this way, since the third drain hole 53 that penetrates the circuit board 20 vertically is provided between the connection parts, the water remaining on the circuit board 20 can be guided downward through the third drain hole 53 by gravity and discharged. Therefore, it is possible to suppress the water that has entered from remaining on the circuit board 20 when the vehicle has recovered from the flooded state.

[0059] Next, refer to Figures 11 to 13 to describe the first to third modified examples of the drain part 54.

[0060] Figure 11 FIG. is a perspective view showing a first modified example of the drain part 54 provided in the lower housing 12. Figure 12 FIG. is a perspective view showing a second modified example of the drain part 54 provided in the lower housing 12. Figure 13 FIG. is a perspective view showing a third modified example of the drain part 54 provided in the lower housing 12.

[0061] As Figure 11 shown, the drain part 54 may also be an inclined surface that is not formed by opening on the side end surface of the lower housing 12 but is formed inside the outer peripheral edge and opens downward to the flat plate part 12a. In this case, it is also possible to guide the water that has been guided to the lower part of the circuit board 20 through the first drain hole 51 and the second drain hole 52 to the outside of the housing 10 by gravity and discharge it.

[0062] As Figure 12 shown, the drain part 54 may also be formed by a lower stepped surface 54a that protrudes downward from the flat plate part 12a and a long hole-shaped opening part 54b that opens in the lower stepped surface 54a. In this case, the water that has been guided to the lower part of the circuit board 20 through the first drain hole 51 and the second drain hole 52 is guided to the lower stepped surface 54a by gravity. And it is possible to guide the water that has gathered on the lower stepped surface 54a to the outside of the housing 10 through the opening part 54b by gravity and discharge it.

[0063] As Figure 13As shown, the drainage section 54 can also be a plurality of slit sections 55 provided by forming a plurality of claw sections 56 at the end of the flat section 12a of the lower housing 12. In this case, the drainage section 54 is not inclined with respect to the flat section 12a, but depending on the position where the electronic device 100 is placed, there may be a situation where the electronic device 100 itself is inclined. Thus, by not forming an inclined surface but only providing the claw sections 56 and the slit sections 55, the inclination of the electronic device 100 itself can be utilized, and the water guided to the lower part of the circuit board 20 through the first drainage hole 51 and the second drainage hole 52 can be guided to the outside of the housing 10 and discharged by gravity.

[0064] According to the above embodiments, the following effects are achieved.

[0065] The electronic device 100 includes: a connector 30 into which a holder 40 is inserted; a circuit board 20 to which the connector 30 is mounted; a housing 10 that houses the circuit board 20 and the connector 30 such that the opening 32 of the connector 30 into which the holder 40 is inserted is exposed to the outside; and a drainage mechanism 50 that is provided so as to face the energized portion through which current flows and discharges water to the outside of the housing 10.

[0066] In this structure, the electronic device 100 includes a drainage mechanism 50 that is provided so as to face the energized portion through which current flows on the circuit board 20 and discharges water to the outside of the housing 10. Therefore, even if water enters the inside of the housing 10, the water on the energized portion through which current flows on the circuit board 20 will be discharged to the outside of the housing 10 through the drainage mechanism 50. Accordingly, the generation of leakage current can be suppressed, and the enlargement of the electronic device 100 can be suppressed.

[0067] In addition, the drainage mechanism 50 has a first drainage hole 51 that is provided so as to penetrate the lower surface of the connector 30 vertically and discharges the water that has entered the connector 30 to the outside.

[0068] According to this structure, since the first drainage hole 51 that vertically penetrates the lower surface of the connector 30 is provided, the water that has entered the connector 30 can be guided to the outside of the connector 30 and discharged by gravity. Therefore, it is possible to suppress the water that has entered from staying inside the connector 30 when the vehicle returns from the flooded state.

[0069] In addition, when the vehicle returns from the flooded state and the operator pulls out the holder 40 from the connector 30 for disassembly, the water that has entered the connector 30 has been guided and discharged to the outside of the connector 30. Therefore, the operator can perform the operation safely.

[0070] In addition, the connector 30 is mounted on the upper surface of the circuit board 20, and the drainage mechanism 50 has a second drainage hole 52 which is provided so as to penetrate the circuit board 20 vertically at a position above the position where the second drainage hole 52 communicates with the first drainage hole 51 in the vertical direction.

[0071] According to this structure, since the second drainage hole 52 that penetrates the circuit board 20 vertically is provided, the water discharged from inside the connector 30 through the first drainage hole 51 can be guided downward and discharged from the circuit board 20 by gravity. Therefore, it is possible to suppress the water that has entered from staying on the circuit board 20 when the vehicle has recovered from the flooded state.

[0072] In addition, the housing 10 has a lower housing 12 located on the lower side of the circuit board 20, and the drainage mechanism 50 has a drainage portion 54 which is formed in the lower housing 12 and is used to guide the water discharged from the second drainage hole 52 to the outside of the housing 10.

[0073] According to this structure, since the drainage portion 54 is provided in the lower housing 12, the water guided to the lower side of the circuit board 20 through the first drainage hole 51 and the second drainage hole 52 can be guided to the outside of the housing 10 and discharged by gravity. Therefore, it is possible to suppress the water that has entered from staying inside the housing 10 when the vehicle has recovered from the flooded state.

[0074] In addition, the drainage portion 54 has a plurality of slit portions 55 provided so as to open intermittently.

[0075] According to this structure, since the drainage portion 54 has a plurality of slit portions 55, the opening area of the drainage portion 54 becomes smaller, so it is possible to prevent the fingers of an operator or the like from entering from the outside. Therefore, it is possible to suppress the operator from touching the energized portion inside the housing 10.

[0076] In addition, the holder 40 has a holder body 41 which is inserted into the connector 30, and a fastening portion 44 which fixes the first terminal portion 42 and the second terminal portion 43 in a contacting state. The first terminal portion 42 is disposed inside the holder body 41 and is connected to the wire harness 45, and the second terminal portion 43 is connected to the connector pin 33 inside the connector 30 when the holder 40 is inserted into the connector 30. The first drainage hole 51 is provided so as to open at at least one of a first position 58 and a second position 59. The first position 58 is the position where the first drainage hole 51 communicates with the docking surface between the top end portion of the holder 40 and the inner surface of the connector 30, and the second position 59 is the position where the first drainage hole 51 communicates with the opposing surface between the holder body 41 and the fastening portion 44.

[0077] According to this structure, the first drain hole 51 opens at at least one of a first position 58 and a second position 59 where water is not easily discharged to the outside when water enters the connector 30. Therefore, water that has accumulated in the energized portion through which current flows within the electronic device 100 can be guided and discharged to the outside. Thus, it is possible to suppress water that has entered from remaining near the energized portion when the vehicle has recovered from a flooded state.

[0078] In addition, a plurality of connectors 30 are provided along the outer peripheral edge of the circuit board 20, and the drainage mechanism 50 has a third drain hole 53 that is provided so as to penetrate the circuit board 20 vertically between the connection portions where the connector pins 33 of adjacent pairs of connectors 30 are electrically connected to the circuit board 20.

[0079] According to this structure, since the third drain hole 53 that penetrates the circuit board 20 vertically is provided between the connection portions, water that has accumulated on the circuit board 20 can be guided and discharged downward through the third drain hole 53 by gravity. Thus, it is possible to suppress water that has entered from remaining on the circuit board 20 when the vehicle has recovered from a flooded state.

[0080] The present invention is not limited to the above-described embodiments. Needless to say, various modifications can be made within the scope of the technical idea described in the claims.

[0081] For example, in the above-described embodiment, the case where the electronic device 100 is a battery management system has been described. However, as long as the electronic device 100 is mounted on a vehicle, it can be any electronic device.

[0082] This application claims the priority based on Japanese Patent Application No. 2022-167691 filed with the Japan Patent Office on October 19, 2022, and the entire content of this application is incorporated into this specification by reference.

Claims

1. An in-vehicle electronic device, wherein, the in-vehicle electronic device includes: a connector into which a holder is inserted; a circuit board to which the connector is mounted; a housing that houses the circuit board and the connector in such a manner that an opening portion of the connector into which the holder is inserted is exposed to the outside; and a drainage mechanism that is arranged to face a current-carrying portion through which current flows and is used to discharge water to the outside of the housing.

2. The in-vehicle electronic device according to claim 1, wherein, the drainage mechanism has a first drainage hole that is provided so as to penetrate the lower surface of the connector vertically, and discharges water that has entered the connector to the outside.

3. The in-vehicle electronic device according to claim 2, wherein, the connector is mounted on the upper surface of the circuit board, the drainage mechanism has a second drainage hole that is provided so as to penetrate the circuit board vertically at a position that is vertically communicated with the first drainage hole.

4. The in-vehicle electronic device according to claim 3, wherein, the housing has a lower housing located on the lower side of the circuit board, the drainage mechanism has a drainage portion that is formed in the lower housing and is used to guide water discharged from the second drainage hole to the outside of the housing.

5. The in-vehicle electronic device according to claim 4, wherein, the drainage portion has a plurality of slit portions that are provided so as to open intermittently.

6. The in-vehicle electronic device according to any one of claims 2 to 5, wherein, the holder has: a main body portion that is inserted into the connector; a fastening portion that fixes a first terminal portion and a second terminal portion in a contacting state, the first terminal portion being disposed inside the main body portion and connected to a wire harness, and the second terminal portion being connected to a connector pin inside the connector when the holder is inserted into the connector, the first drainage hole is provided so as to open at at least one of a first position and a second position, the first position being a position where the first drainage hole communicates a docking surface between a top end portion of the holder and an inner surface of the connector, and the second position being a position where the first drainage hole communicates a relative surface between the main body portion and the fastening portion.

7. The in-vehicle electronic device according to any one of claims 1 to 5, wherein, a plurality of the connectors are provided along the outer peripheral edge of the circuit board, the drainage mechanism has a third drainage hole that is provided so as to penetrate the circuit board vertically between connection portions where connector pins of adjacent pairs of the connectors are electrically connected to the circuit board.

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