Electrical connection box

Abstract

To provide an electric connection box capable of compatibly suppressing water from entering a storage space and exhausting heat from the storage space.SOLUTION: An electric connection box 1 internally has a storage space in which an electronic component R is housed. The electric connection box 1 comprises: a retention part 12 which retains the electronic component R; a first opening part 33 which is provided in a bottom wall 32 of the electric connection box 1 to drain water from the inside to the outside of the storage space, and links the inside and outside of the storage space to each other; and a second opening part 14 which is arranged to hold the retention part 12 with the first opening part 33, links the inside and outside of the storage space to each other and suppresses water from entering the inside of the storage space from the outside. The second opening part 14 has, as a water-stop structure, a recessed wall 15 which has a concave shape hollowed from the outside to the inside of the storage space, and a through hole 16 which is arranged at an inner part in the hollow direction of the recessed wall 15 and links the inside and outside of the storage space to each other.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to an electrical connection box having an accommodation space inside which electronic components can be accommodated.

Background Art

[0002] Conventionally, an electrical connection box having an accommodation space inside for accommodating electronic components such as a relay box mounted on a vehicle has been proposed (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the above-described electrical connection box, an intake port and an exhaust port are provided in an outer wall that defines the accommodation space, and heat generated when the electronic components are driven is discharged from the inside of the accommodation space to the outside together with the air inhaled from the intake port and exhausted from the exhaust port. However, for example, when water is sprayed on such an electrical connection box (for example, when high-pressure washing is performed on a vehicle on which the electrical connection box is mounted), there is a possibility that water may enter the inside of the electrical connection box through the intake port or the exhaust port. When the water that has entered the inside of the electrical connection box comes into contact with electronic components such as relays, the normal operation of those electronic components may be hindered. Therefore, it is desirable to realize heat dissipation from the accommodation space while preventing such water intrusion.

[0005] The present invention has been made in view of the above circumstances, and an object thereof is to provide an electrical connection box capable of achieving both suppression of water intrusion into the accommodation space and heat dissipation from the accommodation space.

Means for Solving the Problems

[0006] In order to achieve the above object, the electrical connection box according to the present invention is characterized by the following [1] to 2 . [1] An electrical connection box having an accommodation space inside which electronic components can be accommodated, a holding portion for holding the electronic components, a first opening provided in the bottom wall of the electrical connection box for draining water from the inside to the outside of the accommodation space, and communicating the inside and outside of the accommodation space; and a second opening having a water stop structure that is disposed so as to sandwich the holding portion between the second opening and the first opening, communicates the inside and outside of the accommodation space, and suppresses intrusion of water from the outside to the inside of the accommodation space. 、 The second opening is As the water stop structure, it has a concave wall having a concave shape that depresses from the outside to the inside of the accommodation space, and a through hole that is disposed at the innermost part of the depression direction of the concave wall and communicates the inside and outside of the accommodation space. It is an electrical connection box. 2 In the electrical connection box described in the above [1] to above, the bottom wall is inclined so as to guide water toward the first opening, and it is an electrical connection box.

[0007] ​​According to the electrical connection box with the above [1] configuration, a first opening provided in the bottom wall of the electrical connection box so as to sandwich a holding portion that will hold electronic components, and a water stop structure that suppresses the intrusion of water from the outside to the inside of the accommodation space are arranged. As the air heated by the heat emitted from the electronic components moves upward, an air flow from the bottom to the top is generated inside the accommodation space. In other words, an air flow (an air flow due to the so-called chimney effect) is generated such that the air flowing in from the first opening disposed on the bottom wall of the electrical connection box passes through the holding portion and is discharged from the second opening. Thereby, efficient exhaust heat from the accommodation space can be achieved. Since there is no need to incorporate components such as an electric fan into the electrical connection box, there is also an advantage in that manufacturing costs and the risk of failure can be reduced. Furthermore, since the second opening has a water stop structure, even if the electrical connection box is flooded, the intrusion of water into the accommodation space is suppressed. Since the first opening is originally for drainage purposes, even if water intrudes from the first opening, the water will be quickly discharged from the first opening. Therefore, the electrical connection box of this configuration can achieve both suppression of water intrusion into the accommodation space and exhaust heat from the accommodation space.

[0008] Furthermore, The above 1 According to the electrical connection box with the above configuration, by arranging a through hole at the inner part of a concave wall that is recessed from the outside to the inside of the accommodation space, it is possible to suppress water from coming into contact with the through hole when flooded. That is, with such a water stop structure, the intrusion of water from the second opening into the inside of the accommodation space is suppressed.

[0009] The above 2 According to the electrical connection box with the above configuration, the bottom wall of the electrical connection box is inclined so as to guide water toward the first opening. Therefore, even if water intrudes into the inside of the accommodation space through the first opening, the water can be guided to the first opening by the inclination of the bottom wall and quickly discharged from the first opening.

Advantages of the Invention

[0010] Thus, according to the present invention, it is possible to provide an electrical connection box that can achieve both suppression of water intrusion into the accommodation space and heat exhaust from the accommodation space.

[0011] The present invention has been briefly described above. Further, the details of the present invention will be further clarified by reading through the embodiments for carrying out the invention described below with reference to the accompanying drawings.

Brief Description of the Drawings

[0012]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Embodiments for Carrying Out the Invention

[0013] <Embodiment> Hereinafter, with reference to the drawings, the electrical connection box 1 according to the embodiment of the present invention shown in FIG. 1 will be described. The electrical connection box 1 is typically a relay box mounted on a vehicle and having an internal space for accommodating components R (see FIGS. 2 to 4), such as electronic components like relays and other components. Hereinafter, for convenience of explanation, as shown in FIG. 1, "front", "rear", "left", "right", "up" and "down" are defined. The "front-rear direction", "left-right direction" and "up-down direction" are orthogonal to each other. When the electrical connection box 1 is mounted on the vehicle, the "front-rear direction", "left-right direction" and "up-down direction" respectively correspond to the front-rear direction, left-right direction and up-down direction of the vehicle. Also, the side facing the inside of the electrical connection box 1 is called the "inner" side, and the side facing the outside of the electrical connection box 1 is called the "outer" side.

[0014] As shown in FIGS. 1 and 2, the electrical connection box 1 is composed of a frame 2, a lower cover 3 assembled below the frame 2 so as to close the lower end opening of the frame 2, and an upper cover 4 assembled above the frame 2 so as to close the upper end opening of the frame 2. All of the above three components constituting the electrical connection box 1 are resin molded bodies.

[0015] In the electrical connection box 1, as shown in FIG. 1, a wire 6 electrically connected to a part of the component R located inside the electrical connection box 1 is led out to the outside of the electrical connection box 1 through a wire lead-out hole 5 provided in the front side portion of the electrical connection box 1. Further, a wire (not shown) electrically connected to another part of the component R is led out to the outside of the electrical connection box 1 through a wire lead-out hole 9 (see FIG. 4(a)) provided in the lower left portion of the electrical connection box 1. In addition, a wire 8 electrically connected to a bus bar (not shown) assembled to the holding portion 12 inside the electrical connection box 1 is led out to the outside of the electrical connection box through the wire lead-out hole 7. Note that, in addition to or instead of the wire 8, a wire electrically connected to another electrical connection box (for example, another electrical connection box for function expansion) may be connected to the bus bar.

[0016] Hereinafter, the frame 2, the lower cover 3, and the upper cover 4 that constitute the electrical connection box 1 will be described in order. First, the frame 2 will be described. As shown in FIGS. 1 to 4, the frame 2 includes a substantially rectangular cylindrical side wall portion 11 that extends in the vertical direction. The side wall portion 11 constitutes most of the appearance of the side surface of the electrical connection box 1. As shown in FIGS. 2 to 4, a flat plate-shaped holding portion 12 is provided on the side wall portion 11 so as to extend in a direction orthogonal to the vertical direction of the internal space of the side wall portion 11 and divide it into upper and lower parts. A plurality of components R of a plurality of types are held on the holding portion 12 so as to be arranged along the extending direction of the holding portion 12.

[0017] At the right front corner portion of the side wall portion 11 that extends in the vertical direction, as shown in FIGS. 1 and 2, at a location excluding the upper end edge portion of the side wall portion 11, a concave portion 13 that recesses toward the inside of the electrical connection box 1 is provided so as to extend in the vertical direction. An opening 14 is provided at a location that defines the upper end of the concave portion 13 in the side wall portion 11 (see FIGS. 3(a), 3(b), 4(a), and 4(b)). Note that the opening 14 corresponds to the "second opening" in the present invention.

[0018] As particularly shown in FIG. 4(b), the opening 14 has a concave wall 15 that recesses upward (from the outside to the inside of the electrical connection box 1) and a through hole 16 that is disposed at the innermost part (the bottom of the concave shape) of the concave wall 15 in the recessed direction and penetrates in the vertical direction (communicates the inside and outside of the electrical connection box 1). Therefore, even if the electrical connection box 1 is exposed to water, the concave wall 15 that recesses from the outside to the inside of the electrical connection box 1 suppresses direct contact of water with the through hole 16 disposed at the innermost part of the concave wall 15. That is, the opening 14 has a water-stopping structure that suppresses the intrusion of water from the outside to the inside of the electrical connection box 1. The opening 14, in cooperation with the communication hole 17 and the opening 33 described later, exhibits an exhaust function of discharging air from the inside to the outside of the electrical connection box 1 in addition to the above-described water-stopping function. This point will be described later. Note that the opening 33 corresponds to the "first opening" in the present invention.

[0019] In the holding portion 12, for example, a communication hole 17 that communicates the upper space and the lower space of the holding portion 12 is formed at a predetermined position at the rear end portion thereof (see FIGS. 3(a), 3(c), and 4(c)). In addition to the communication hole 17, communication holes that communicate the upper space and the lower space of the holding portion 12, such as the communication hole 17, may be formed in the holding portion 12. The operation due to the provision of the communication hole 17 will be described later.

[0020] At a plurality of circumferential positions (in this example, seven positions) on the outer surface of the lower end portion of the side wall portion 11, engaged portions 18 each including a through hole extending in the vertical direction are integrally provided (see FIGS. 1 to 3). The engaged portion 18 has a function of assembling the lower cover 3 to the frame 2.

[0021] At a plurality of circumferential positions (in this example, three positions) on the outer surface of the upper end portion of the side wall portion 11, engaged portions 19 are integrally provided (see FIGS. 1 to 3). The engaged portion 19 has a function of assembling the upper cover 4 to the frame 2.

[0022] At a plurality of circumferential positions (in this example, four positions) on the outer surface of the lower end portion of the side wall portion 11, stay portions 21 extending downward are integrally provided (see FIGS. 1 to 3). The stay portion 21 has a function of fixing the frame 2 (that is, the electrical connection box 1) to the mounting location of the vehicle by assembling the tip end portion thereof to the mounting location of the vehicle.

[0023] At a position corresponding to the wire lead-out hole 5 (see FIG. 1) in the side wall portion 11, a semi-cylindrical gutter-shaped portion 22 opening rearward is provided so as to extend downward (see FIG. 2). The gutter-shaped portion 22 has a function of constituting the front side portion of the inner wall that defines the wire lead-out hole 5.

[0024] At a location corresponding to the wire outlet hole 7 (see Fig. 1) in the side wall portion 11, a semi-cylindrical gutter-shaped portion 23 that opens downward is provided so as to extend obliquely in the lower right direction (see Fig. 2). The gutter-shaped portion 23 has a function of constituting the upper side portion of the inner wall that defines the wire outlet hole 7. Further, at a location corresponding to the wire outlet hole 9 (see Fig. 4(a)) in the side wall portion 11, a semi-cylindrical gutter-shaped portion 24 that opens downward is provided so as to extend obliquely in the lower right direction (see Fig. 3(a)). The gutter-shaped portion 24 has a function of constituting the upper side portion of the inner wall that defines the wire outlet hole 9.

[0025] Next, the lower cover 3 will be described. As shown in Fig. 2, the lower cover 3 integrally includes an annular side wall portion 31 that constitutes most of the outer appearance of the lower side surface of the electrical connection box 1, and a bottom wall portion 32 that closes the annular lower end opening of the side wall portion 31 and constitutes most of the outer appearance of the bottom surface of the electrical connection box 1. The annular upper end edge portion of the side wall portion 31 has a shape corresponding to the annular lower end edge portion of the side wall portion 11 of the frame 2 and is capable of fitting with the annular lower end edge portion of the side wall portion 11.

[0026] The bottom wall portion 32 has a shape that slopes downward from the rear to the front and slopes downward from the left to the right. Therefore, the inner surface (upper surface) of the bottom wall portion 32 also slopes downward from the rear to the front and slopes downward from the left to the right. Thus, at the inner surface of the bottom wall portion 32, the right front corner portion is at the lowest position. As will be described later, due to the inner surface of the bottom wall portion 32 sloping in this way, water that has entered the electrical connection box 1 will be guided along the inner surface of the bottom wall portion 32 toward the right front corner portion, which is the lowest position.

[0027] Near the right front corner portion of the bottom wall portion 32, as shown in Fig. 4(a), Fig. 5(a), and Fig. 5(b), an opening 33 is provided. As shown in Fig. 5, the opening 33 has a raised portion 34 that protrudes upward (toward the inside of the electrical connection box 1) on the inner surface of the bottom wall portion 32 and is recessed upward (toward the inside of the electrical connection box 1) on the outer surface of the bottom wall portion 32, and an opening 35 provided at the front side portion of the raised portion 34 that communicates the internal space of the raised portion 34 (i.e., the outside of the electrical connection box 1) with the inside of the electrical connection box 1.

[0028] In this way, by providing the opening 33 in the vicinity of the right front corner of the inclined bottom wall portion 32 (i.e., the lowest position of the bottom wall portion 32), even if water enters the inside of the electrical connection box 1 through the opening 35 of the opening 33, the water can be guided to the opening 33 by the inclination of the bottom wall portion 32 and quickly discharged from the opening 35 of the opening 33. In addition to the above-described drainage function, the opening 33 also exhibits an intake function of introducing air from the outside to the inside of the electrical connection box 1 in cooperation with the opening 14 and the communication hole 17 provided in the frame 2. This point will be described later.

[0029] At a plurality of circumferential positions (seven positions in this example) on the outer surface of the upper end portion of the side wall portion 31, locking pieces 36 extending upward are integrally provided corresponding to the plurality of locked portions 18 of the frame 2 (see FIG. 2).

[0030] At a position corresponding to the wire lead-out hole 5 (see FIG. 1) in the side wall portion 11, a concave portion 37 that is recessed toward the inside of the electrical connection box 1 is provided so as to extend in the vertical direction (see FIG. 2). The concave portion 37 has a function of constituting the rear side portion of the inner wall that defines the wire lead-out hole 5.

[0031] At a position corresponding to the wire lead-out hole 7 (see FIG. 1) in the side wall portion 31, a semi-cylindrical gutter-shaped portion 38 that opens upward is provided so as to obliquely extend in the lower right direction (see FIG. 2). The gutter-shaped portion 38 has a function of constituting the lower side portion of the inner wall that defines the wire lead-out hole 7. Further, at a position corresponding to the wire lead-out hole 9 (see FIG. 4(a)) in the side wall portion 31, a semi-cylindrical gutter-shaped portion 39 that opens upward is provided so as to obliquely extend in the lower left direction (see FIG. 2). The gutter-shaped portion 39 has a function of constituting the lower side portion of the inner wall that defines the wire lead-out hole 9.

[0032] Next, the upper cover 4 will be described. As shown in FIG. 2, the upper cover 4 includes an annular side wall portion 41 that constitutes most of the outer appearance of the upper side surface of the electrical connection box 1, and an upper wall portion 42 that closes the annular upper end opening of the side wall portion 41 and constitutes most of the outer appearance of the upper surface of the electrical connection box 1, integrally. The annular lower end edge portion of the side wall portion 41 has a shape corresponding to the annular upper end edge portion of the side wall portion 11 of the frame 2 and is fitted to the annular upper end edge portion of the side wall portion 11.

[0033] On the outer surfaces of a plurality of locations (in this example, three locations) in the circumferential direction of the side wall portion 41, locking portions 43 are integrally provided corresponding to the plurality of locked portions 19 of the frame 2, respectively. The frame 2, the lower cover 3, and the upper cover 4 that constitute the electrical connection box 1 have been described above.

[0034] In order to assemble the electrical connection box 1 composed of the frame 2, the lower cover 3, and the upper cover 4, it is necessary to assemble the lower cover 3 to the frame 2 and assemble the upper cover 4 to the frame 2.

[0035] In order to assemble the lower cover 3 to the frame 2, first, a plurality of locking pieces 36 (see FIG. 2) of the lower cover 3 are respectively inserted into the plurality of through holes of the locked portion 18 (see FIG. 2) of the frame 2 from below. From this state, the annular upper end edge portion of the side wall portion 31 of the lower cover 3 is fitted to the annular lower end edge portion of the side wall portion 11 of the frame 2, and the plurality of locking pieces 36 are locked to the plurality of locked portions 18. Thereby, the assembly of the lower cover 3 to the frame 2 is completed (see FIG. 1).

[0036] Similarly, in order to assemble the upper cover 4 to the frame 2, the annular lower end edge portion of the side wall portion 41 of the upper cover 4 is fitted to the annular upper end edge portion of the side wall portion 11 of the frame 2, and the plurality of locking portions 43 of the upper cover 4 are locked to the plurality of locked portions 19 of the frame 2. Thereby, the assembly of the upper cover 4 to the frame 2 is completed (see FIG. 1).

[0037] In the assembled state of the electrical connection box 1, the engagement of the plurality of locking pieces 36 and the plurality of locked portions 18 prevents the lower cover 3 from separating downward from the frame 2. Similarly, the engagement of the plurality of locking portions 43 and the plurality of locked portions 19 prevents the upper cover 4 from separating upward from the frame 2. Further, the gutter-shaped portion 22 of the frame 2 and the concave portion 37 of the lower cover 3 (see FIG. 2) define an electric wire outlet hole 5 through which the electric wire 6 is inserted (see FIG. 1). Similarly, the gutter-shaped portion 23 of the frame 2 and the gutter-shaped portion 38 of the lower cover 3 (see FIG. 2) define an electric wire outlet hole 7 through which the electric wire 8 is inserted (see FIG. 1).

[0038] Hereinafter, the intake action and exhaust action (and thus, the exhaust heat action) due to the cooperation of the opening 14 and the communication hole 17 provided in the frame 2 and the opening 33 provided in the lower cover 3 will be described. Hereinafter, for convenience of explanation, as shown in FIG. 4(a), among the internal spaces of the electrical connection box 1 (the space for accommodating the component R), the space above the holding portion 12 of the frame 2 is referred to as the "upper space H1", and the space below the holding portion 12 of the frame 2 is referred to as the "lower space H2". The holding portion 12 separates the internal space of the electrical connection box 1 into the upper space H1 and the lower space H2.

[0039] As shown in FIG. 4(a), the opening 14 is located above the holding portion 12, and the opening 33 is located below the holding portion 12. Therefore, the opening 14 and the opening 33 are arranged so as to sandwich the holding portion 12 vertically, the opening 14 communicates with the upper space H1, and the opening 33 communicates with the lower space H2.

[0040] In the usage state of the electrical connection box 1 mounted on the vehicle, among the components R located inside the electrical connection box 1, especially the electronic components generate heat as they operate. When the electronic components generate heat, the heat emitted from the electronic components warms the air located around the electronic components (that is, the air located near the holding portion 12 that holds the electronic components). The warmed air tends to rise due to its relatively lower density compared to the non-warmed air. As a result, an air flow from the bottom to the top occurs inside the electrical connection box 1.

[0041] Specifically, the air inhaled into the lower space H2 from the opening 35 of the opening 33 provided in the lower cover 3 (see FIGS. 4(a) and 5) flows into the upper space H1 through the communication hole 17 provided in the frame 2 (see FIGS. 3(a), 3(c) and 4(c)), and the air flowing into the upper space H1 is discharged from the through hole 16 of the opening 14 provided in the frame 2 (see FIGS. 3(a), 3(b), 4(a) and 4(b)), resulting in an air flow. Such an air flow is also called the chimney effect. As a result, relatively low-temperature air is introduced into the interior of the electrical connection box 1 through the opening 33, and relatively high-temperature air is discharged to the outside of the electrical connection box 1 through the opening 14, so that waste heat can be removed from the internal space of the electrical connection box 1.

[0042] <Function and Effect> As described above, according to the electrical connection box 1 according to the present embodiment, the opening 33 provided in the bottom wall portion 32 of the electrical connection box 1 and the opening 14 having a water stop structure for suppressing the intrusion of water from the outside to the inside of the electrical connection box 1 are arranged so as to sandwich the holding portion 12 that holds the electronic components. As the air heated by the heat generated from the electronic components convects upward, an air flow from bottom to top occurs inside the electrical connection box 1. In other words, an air flow occurs such that the air flowing in from the opening 33 arranged in the bottom wall portion 32 of the electrical connection box 1 is discharged from the opening 14 after passing through the holding portion 12. Thereby, waste heat can be removed from the internal space of the electrical connection box 1. Further, since the opening 14 has a water stop structure, the intrusion of water into the internal space of the electrical connection box 1 is suppressed. Further, since the opening 33 is originally for draining water, even if water intrudes from the opening 33, the water will be quickly discharged from the opening 33. Therefore, the electrical connection box 1 according to the present embodiment can achieve both suppression of water intrusion into the internal space of the electrical connection box 1 and waste heat removal from the internal space of the electrical connection box 1.

[0043] Furthermore, even if the opening 14 is flooded, the recessed wall 15 that is recessed from the outside to the inside of the electrical connection box 1 prevents water from directly contacting the through hole 16 disposed at the inner end of the recessed wall 15. That is, such a water stop structure suppresses the intrusion of water from the opening 14 into the interior of the electrical connection box 1.

[0044] Furthermore, the bottom wall portion 32 of the electrical connection box 1 is inclined so as to guide water toward the opening 33. Therefore, even if water intrudes into the interior of the electrical connection box 1 through the opening 33, the water can be guided to the opening 33 by the inclination of the bottom wall portion 32 and quickly discharged from the opening 33.

[0045] <Other embodiments> Note that the present invention is not limited to the above-described embodiments, and various modifications can be adopted within the scope of the present invention. For example, the present invention is not limited to the above-described embodiments, and can be appropriately modified, improved, etc. In addition, the material, shape, dimensions, number, arrangement location, etc. of each component in the above-described embodiments are arbitrary as long as the present invention can be achieved, and are not limited.

[0046] In the above embodiment, the opening 14 constitutes a water stop structure by the recessed wall 15 and the through hole 16. On the other hand, the opening 14 may have any water stop structure as long as it has a function of suppressing the intrusion of water from the outside to the inside of the electrical connection box 1.

[0047] Furthermore, in the above embodiment, the electrical connection box 1 is a relay box (electrical connection box) that houses a plurality of components R, but the electrical connection box 1 may be a structure having a function other than the relay box (electrical connection box).

[0048] Here, the features of the embodiments of the electrical connection box 1 according to the present invention described above are briefly summarized and listed in [1] to [3] below. [1] An electrical connection box (1) having an accommodation space inside that can accommodate electronic components (R), A holding part (12) for holding the electronic component (R); A first opening (33) provided in the bottom wall (32) of the electrical connection box (1) for draining water from the inside to the outside of the accommodation space, and communicating the inside and outside of the accommodation space; A second opening (14) disposed so as to sandwich the holding part (12) between the second opening (14) and the first opening (33), communicating the inside and outside of the accommodation space, and having a water stop structure for suppressing the intrusion of water from the outside to the inside of the accommodation space; Electrical connection box (1). [2] In the electrical connection box (1) according to [1] above, The second opening (14) As the water stop structure, it has a concave wall (15) having a concave shape that is recessed from the outside to the inside of the accommodation space, and a through hole (16) disposed at the deepest part of the concave wall (15) in the recessed direction and communicating the inside and outside of the accommodation space; Electrical connection box (1). [3] In the electrical connection box (1) according to [1] or [2] above, The bottom wall (32) Is inclined so as to guide water toward the first opening (33); Electrical connection box (1).

Explanation of symbols

[0049] 1 Electrical connection box 12 Holding part 14 Opening (second opening) 15 Concave wall 16 Through hole 32 Bottom wall part (bottom wall) 33 Opening (first opening) R Component (electronic component)

Claims

1. An electrical connection box having an accommodation space inside which can accommodate electronic components, a holding part that will hold the electronic components, a first opening provided in the bottom wall of the electrical connection box for draining water from the inside to the outside of the accommodation space, and communicating the inside and outside of the accommodation space, a second opening that is arranged so as to sandwich the holding part between the second opening and the first opening, has a water stop structure that communicates the inside and outside of the accommodation space and suppresses the intrusion of water from the outside to the inside of the accommodation space, and the second opening is as the water stop structure, has a concave wall having a concave shape that is recessed from the outside to the inside of the accommodation space, and a through hole that is arranged at the innermost part of the concave wall in the recessed direction and communicates the inside and outside of the accommodation space, an electrical connection box.

2. In the electrical connection box according to Claim 1, the bottom wall is inclined so as to guide water toward the first opening, an electrical connection box.

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