Vehicle electrical equipment box

Abstract

To provide a vehicle electrical equipment box which improves the heat insulation performance of the joint between a lid and a case.SOLUTION: A vehicle electrical equipment box includes a case 2 having an internal storage space 29 that is open to the outside world, a lid 3 that opens and closes an opening 20 of the case, and a gasket 4 arranged between the case and the lid, the case includes a case flange portion 21 that is located on the periphery of the opening, extending circumferentially of the opening and protruding in the radial direction of the opening, and the lid includes a lid flange portion 31 that faces the case flange portion, and when the lid closes the opening of the case 2 in a closed state, a gap 6 is formed between the case flange portion and the lid flange portion, and the gap has a gasket accommodating region 61 that accommodates and holds a gasket, and an outer region 62 that is closer to the outside world than the gasket accommodating region, and at least one of the case flange portion and the lid flange portion includes an interference portion 5 that is exposed to the outer region 62 and interferes with a fluid flow path from the outside world toward the storage space.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to an electric device box for a vehicle mounted on a vehicle.

Background Art

[0002] Vehicles are equipped with various electric devices such as a battery for driving an automobile and electronic devices for controlling the battery. These electric devices are usually mounted on the vehicle in a state of being housed in an electric device box and isolated from the outside. Conventionally, a metal electric device box has been used.

[0003] In recent years, while the demand for improving the fuel efficiency of vehicles and reducing the CO2 emissions has been increasing, it has been desired to reduce the weight of various vehicle components and vehicle-mounted items. In order to reduce the weight of the electric device box, studies have been underway to change the material of the electric device box from metal to resin.

[0004] In addition, some of the electric devices have low resistance to heat. The electric device box for housing such an electric device is required to have heat resistance and fire resistance that can reduce the influence of heat on the electric members.

[0005] In view of such circumstances, for example, Patent Document 1 and Patent Document 2 propose an electric device box in which a part of the material is resin. These patent documents impart fire resistance to the electric device box using a resin material by providing a fire-resistant layer, a metal layer, or an air layer.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0007] By the way, also in various electric device boxes as described above, if the inside is in communication with the outside world, there is a risk that the electric devices housed inside the electric device box may be exposed to heat.

[0008] For example, in a general electric device box introduced in Patent Document 3, a gasket made of an elastic material is disposed at the joint portion between the lid and the case, and the gap between the lid and the case is sealed by the gasket, thereby blocking the inside of the electric device box from the outside world. Patent Document 2 also introduces that the gap is sealed with a sealing material.

[0009] However, the heat resistance temperature of the elastic material used for the sealing material such as the gasket is about 250 ° C even in the case of fluororubber having high heat resistance. Therefore, when the gasket is exposed to a high heat exceeding this, there is a risk that it deteriorates and the inside and the outside of the electric device box cannot be sufficiently blocked.

[0010] The present invention has been made in view of the above circumstances, and an object to be solved is to provide a technique capable of improving the heat insulation performance of the joint portion between the lid and the case in a vehicle electric device box.

Means for Solving the Problems

[0011] The vehicle electric device box of the present invention for solving the above problems includes a case having an accommodation space inside that opens toward the outside world, a lid that closes the opening of the case, and a gasket disposed between the case and the lid. The case has a case flange portion that is at the peripheral edge of the opening, extends in the circumferential direction of the opening, and protrudes in the radial direction of the opening. The lid has a lid flange portion that faces the case flange portion. In a closed state where the lid closes the opening of the case, a gap is formed between the case flange portion and the lid flange portion. The gap has a gasket accommodation region for accommodating and holding the gasket, and an outer region located on the outside of the gasket accommodation region with respect to the outside world. At least one of the case flange portion and the lid flange portion has an interference portion that protrudes into the outer region and interferes with a fluid flow path directed from the outside world toward the accommodation space.

Advantages of the Invention

[0012] According to the vehicle electrical device box of the present invention, it is possible to improve the heat insulation performance of the joint portion between the lid and the case.

Brief Description of the Drawings

[0013]

Figure 1

Figure 2

Figure 3

Figure 4

Modes for Carrying Out the Invention

[0014] Hereinafter, the vehicle electrical device box of the present invention will be described with specific examples.

[0015] Unless otherwise specified, the numerical range "x to y" described in this specification includes the lower limit x and the upper limit y within the range. And by arbitrarily combining these upper and lower limit values, as well as the numerical values listed in the embodiments, a numerical range can be constituted. Furthermore, a numerical value arbitrarily selected from within the numerical range can be used as the upper and lower limit numerical values.

[0016] The electric device box for a vehicle of the present invention includes a case having an accommodation space opening to the outside, a lid closing the opening of the case, and a gasket disposed between the case and the lid. An electric device can be accommodated in the accommodation space of the case. The electric device accommodated in the accommodation space of the case is shielded from the outside when the opening is closed by the lid.

[0017] The case has a case flange portion that is at the peripheral edge of the opening, extends in the circumferential direction of the opening, and protrudes in the radial direction of the opening. On the other hand, the lid has a lid flange portion facing the case flange portion. In the electric device box for a vehicle of the present invention, a gasket accommodation region for accommodating the gasket and an outer region on the outside of the gasket accommodation region are provided in a gap formed between the case flange portion and the lid flange portion.

[0018] And in this outer region, an interference portion provided on at least one of the case flange portion and the lid flange portion protrudes. The interference portion interferes with the fluid flow path from the outside to the accommodation space in the outer region.

[0019] Due to the presence of such an interference portion, the pressure loss in the fluid flow path from the outside to the accommodation space increases. As a result, the amount of fluid reaching the gasket accommodation space located on the downstream side of the fluid flow path and the gasket accommodated in the accommodation space is reduced, and the temperature of the fluid decreases. Thus, according to the electric device box for a vehicle of the present invention, deterioration of the gasket due to heat from the outside can be suppressed, and as a result, the heat insulation performance of the joint portion between the lid and the case can be improved.

[0020] Hereinafter, the vehicle electrical device box of the present invention will be described for each of its components.

[0021] The electrical devices accommodated in the vehicle electrical device box of the present invention are not limited to the batteries for driving automobiles described above and the electronic devices for controlling the batteries. In addition, various electrical devices powered by the batteries and various electrical devices powered by other power sources can be mentioned. The vehicle electrical device box may accommodate one of these various electrical devices or a plurality of them.

[0022] The vehicle electrical device box of the present invention includes a case, a lid, and a gasket.

[0023] Among these, the gasket may be any one that can be interposed between the case and the lid to seal both of them and is elastically deformable. A general gasket may be used. For example, a gasket made of fluororubber or silicone rubber can be preferably used.

[0024] The case has an accommodation space that opens to the outside world inside, and the lid closes the opening of the case. The shapes of such a case and lid may be any shapes as long as the electrical device can be accommodated in the accommodation space of the case and the opening of the case can be closed by the lid. The case and the lid may also be said to have corresponding shapes to each other.

[0025] Note that the lid in the vehicle electrical device box of the present invention may be able to open and close the opening. If the lid can open and close the opening, the electrical device accommodated in the accommodation space can be taken out. For example, maintenance of the electrical device or replacement of the electrical device can be performed. In some cases, such as when maintenance or replacement of the electrical device is not required, the lid may not need to be opened while keeping the opening closed.

[0026] The materials of the case and the lid in the vehicle electrical device box of the present invention are not particularly limited. The materials of the case and the lid may be resin materials, metal materials, or mixed materials of resin materials and refractory materials.

[0027] Among these, examples of the resin material include polypropylene (PP), polycarbonate (PC), polyamide (PA), polybutylene terephthalate (PBT), polyimide (PI), polybenzimidazole (PBI), polystyrene (PS), acrylonitrile butadiene styrene (ABS), polyphenylene sulfide (PPS), epoxy resin, phenol resin, etc. As the resin material, one or more types appropriate to the type of the electrical device housed in the vehicle electrical device box of the present invention or the vehicle-mounted products placed around the vehicle electrical device box of the present invention may be appropriately selected.

[0028] Examples of the metal material include pure iron, iron alloys such as steel, pure aluminum, aluminum alloys, and flame-retardant magnesium alloys. Also as the metal material, one or more types appropriate to the type of the electrical device or the vehicle-mounted products placed around the vehicle electrical device box of the present invention may be appropriately selected.

[0029] Examples of the refractory material include flame-retardant fiber materials such as glass fiber and carbon fiber, porous ceramics, porous carbon materials, etc. Also as the refractory material, one or more types appropriate to the type of the electrical device or the vehicle-mounted products placed around the vehicle electrical device box of the present invention may be appropriately selected.

[0030] The case and the lid may have a single-phase structure made of the above materials, or may have a multi-layer structure of a refractory layer containing a metal or a refractory material and a resin layer, for example. Furthermore, the case and the lid may be made of the same material, or may be made of different materials. Furthermore, a part and the remainder of the case or the lid may be made of different materials.

[0031] The case has a case flange portion that is located at the peripheral edge of the opening, extends in the circumferential direction of the opening, and protrudes in the radial direction of the opening. On the other hand, the lid has a lid flange portion that faces the case flange portion. The shapes of the case flange portion and the lid flange portion are not particularly limited, and any shape that can form a gap between them in the closed state where the lid closes the opening of the case is acceptable. Note that the lid flange portion only needs to face the case flange portion. For example, it may face only a part of the surface of the case flange portion on the side of the lid flange portion, or may face the entire surface of the case flange portion on the side of the lid flange portion.

[0032] The case flange portion and the lid flange portion may only extend in a part of the circumferential direction of the opening, or may extend intermittently along the circumferential direction of the opening. However, for the convenience of arranging a gasket in the gap between the case flange portion and the lid flange portion, it is preferable that the case flange portion and the lid flange portion extend over the entire circumference in the circumferential direction of the opening. This is because it is preferable to arrange a gasket over the entire circumference of the peripheral edge of the opening.

[0033] As described above, a gap is formed between the case flange portion and the lid flange portion in the closed state. The thickness of the gap, that is, the distance between the case flange portion and the lid flange portion, may be the same length or different lengths along the circumferential direction of the opening. Also, the thickness of the gap may be the same length or different lengths along the radial direction of the opening.

[0034] The gap between the above-described case flange portion and lid flange portion has a gasket accommodation region and an outer region. The outer region is on the outside of the gasket accommodation region, in other words, on the upstream side of the fluid flow path from the outside to the accommodation space.

[0035] Note that, for example, if the electrical device box for a vehicle of the present invention is in the atmosphere, the fluid flow path becomes an air flow path from the outside to the accommodation space. Also, for example, if the electrical device box for a vehicle of the present invention is in water, the fluid flow path becomes a water flow path from the outside to the accommodation space.

[0036] The gasket accommodation area only needs to be able to accommodate the gasket. For example, the surface on the lid flange part side among the case flange parts partitioning the gasket accommodation area may be a flat surface or a concavo-convex surface for accommodating and holding the gasket. Similarly, the surface on the case flange part side among the lid flange parts partitioning the gasket accommodation area may be a flat surface or a concavo-convex surface for accommodating and holding the gasket.

[0037] In the outer area of the vehicle electrical device box of the present invention, an interference part protrudes. Since the interference part protrudes into the outer area, it interferes with the fluid flow path from the outside to the accommodation space. The interference part may be a part of the case flange part or a part of the lid flange part. Both the case flange part and the lid flange part may each have an interference part.

[0038] The interference part only needs to be able to interfere with the fluid flow path, and its shape, size, etc. are not particularly limited. In any case, the presence of the interference part in the outer area causes the interference part to interfere with the fluid flowing from the outside to the accommodation space in the outer area. That is, the interference part changes the flow direction of the fluid, increasing the pressure loss in the fluid flow path from the outside to the accommodation space and reducing the amount of fluid reaching the gasket accommodation space and the gasket. As a result, the temperature of the fluid decreases. Also, the temperature of the fluid decreases because the heat of the fluid is taken away by the interference part or the heat radiated by the heat source in the outside world is absorbed by the interference part.

[0039] Preferably, a plurality of interference parts exist in the flow path direction of the outer area, that is, in the direction from the outside to the accommodation space in the outer area. In this case, at least a part of the fluid is interfered with by the interference part multiple times before reaching the accommodation space from the outside, and the guiding path of the fluid is intricately intertwined in a labyrinth shape. In other words, in this case, the flow direction of the fluid is complicatedly changed by the presence of the interference part. Therefore, in this case, there is an advantage that the pressure loss in the fluid flow path from the outside to the accommodation space is effectively increased, the amount of fluid reaching the gasket accommodation space and the gasket can be effectively reduced, and the temperature of the fluid can be effectively decreased.

[0040] In addition, when both the case flange portion and the lid flange portion have interference portions, the interference portion of the case flange portion (hereinafter, referred to as the case interference portion as necessary) and the interference portion of the lid flange portion (hereinafter, referred to as the lid interference portion as necessary) are preferably adjacent to each other in the flow path direction of the outer region. By doing so, the guiding path of the fluid bends complicatedly in the case flange portion - lid flange portion direction, in other words, in the thickness direction of the gap. Thereby, there is an advantage that the pressure loss in the fluid flow path from the outside to the accommodation space is more effectively increased, and as a result, the temperature of the fluid flowing through the fluid flow path can be effectively decreased.

[0041] When the electric device box for a vehicle of the present invention has a case interference portion and a lid interference portion, and at least one of the case interference portion and the lid interference portion is plural, all the case interference portions may be adjacent to the lid interference portion in the flow path direction of the outer region, or all the lid interference portions may be adjacent to the case interference portion in the flow path direction of the outer region. Alternatively, some of the case interference portions may be adjacent to the lid interference portions in the flow path direction of the outer region, or some of the lid interference portions may be adjacent to the case interference portions in the flow path direction of the outer region. In any case, an effect that the guiding path of the fluid bends complicatedly in the thickness direction of the gap occurs.

[0042] The interference portion may be, for example, a straight protrusion or a straight wall that linearly protrudes in the flow path direction of the outer region and the thickness direction of the gap, or a curved protrusion or a curved wall that protrudes while curving in at least one of the flow path direction of the outer region and the thickness direction of the gap.

[0043] The case interference part may be integrally formed with other parts in the case flange part, or may be separately formed and integrated. The case interference part may be formed of the same material as other parts in the case flange part, or may be formed of a different material. Similarly, the lid interference part may be integrally formed with other parts in the lid flange part, or may be separately formed and integrated. The lid interference part may be formed of the same material as other parts in the lid flange part, or may be formed of a different material.

[0044] Hereinafter, the vehicle electrical device box of the present invention will be described with specific examples together with the drawings.

[0045] (Example 1) The vehicle electrical device box of Example 1 is for housing a battery for driving an automobile. FIG. 1 shows an explanatory diagram schematically explaining the appearance of the vehicle electrical device box of Example 1. FIG. 2 shows an explanatory diagram schematically explaining the state of the vehicle electrical device box of Example 1 cut at the A-A position in FIG. 1.

[0046] Hereinafter, up, down, left, right, front, and rear refer to up, down, left, right, front, and rear shown in FIG. 1.

[0047] As shown in FIG. 1, the vehicle electrical device box 1 of Example 1 includes a case 2, a lid 3, and a gasket 4. The case 2 is arranged on the lower side and the lid 3 is arranged on the upper side.

[0048] Among these, the case 2 has a box shape with a substantially rectangular parallelepiped outer shape. The case 2 has a storage space 29 that opens toward the outside, more specifically, upward. Although not shown, the case 2 has a two-layer structure including a resin material layer containing glass fiber as a refractory material and PP as a resin material, and a refractory layer made of aluminum, and the refractory layer is directed toward the storage space 29 side.

[0049] Case 2 has a case flange portion 21 at the peripheral edge of the opening 20. The case flange portion 21 protrudes in the radial direction of the opening 20 and extends continuously over the entire circumference in the circumferential direction of the opening 20. As shown in FIG. 2, the case flange portion 21 has a case flange general portion 22 having a substantially flat plate shape.

[0050] The portion of the case flange portion 21 on the side of the accommodation space 29 forms a holding groove 23 that is recessed downward. The holding groove 23 extends continuously over the entire circumference in the circumferential direction of the opening 20.

[0051] In the radial direction from the inner side to the outer side of the opening 20, the substantially central portion of the holding groove 23 is relatively stepped down by one step compared to the other portions. This relatively stepped-down portion is a gasket fixing groove portion 24 that houses and holds the engaging portion 40 of the gasket 4, and the portion that is relatively stepped up with respect to the gasket fixing groove portion 24 is a general holding groove portion 25 that houses and holds the general portion 41, which is the remaining portion of the gasket 4.

[0052] The lid 3 has a substantially rectangular parallelepiped box shape that is substantially vertically symmetric with the case 2. The lid 3 has a secondary accommodation space 39 that opens to the outside, more specifically, downward. The lid 3 is made of the same material as the case 2 and has a refractory layer facing the secondary accommodation space 39 side. In the vehicle electrical device box 1 of the first embodiment, the electrical device 90 is accommodated and held so as to be sandwiched between the accommodation space 29 of the case 2 and the secondary accommodation space 39 of the lid 3. The opening of the lid 3 is referred to as a secondary opening 30. The lid 3 closes the opening 20 of the case 2 while facing the secondary opening 30 to the opening 20.

[0053] The lid 3 has a lid flange portion 31 at the peripheral edge of the secondary opening 30. The lid flange portion 31 protrudes in the radial direction of the secondary opening 30 and the opening 20 and extends continuously over the entire circumference in the circumferential direction of the secondary opening 30 and the opening 20.

[0054] As shown in FIGS. 1 and 2, in the closed state where the lid 3 closes the opening 20 of the case 2, the lid flange portion 31 faces the case flange portion 21. In the radially inner - radially outer direction, the length of the lid flange portion 31 is substantially the same as the length of the case flange portion 21.

[0055] As shown in FIG. 2, the lid flange portion 31 has a generally flat lid flange general portion 32 and an interference portion 5 protruding from the lid flange general portion 32.

[0056] There is a gap 6 between the lid flange general portion 32 and the case flange portion 21. The region of the gap 6 on the side of the accommodation space 29, in other words, the region on the side of the holding groove 23, is a gasket accommodation region 61 for accommodating and holding the gasket 4. Also, the region of the gap 6 on the outside - world side, in other words, the radially outer region, rather than the gasket accommodation region 61, is the outer region 62.

[0057] The interference portion 5 protrudes into the outer region 62 of the lid flange portion 31. More specifically, the interference portion 5 protrudes into the portion of the outer region 62 on the side of the gasket accommodation region 61. The interference portion 5 extends continuously over the entire circumferential direction of the sub - opening 30 and the opening 20, protrudes downward, and has a rib - like shape that tapers downward in the protruding direction.

[0058] The lid flange portion 31 and the case flange portion 21 are screwed and fixed to each other at their radially outer ends.

[0059] The gasket 4 is made of fluororubber and is substantially ring - shaped. The gasket 4 has a wide - width and hollow general portion 41 and a narrow - width and solid engagement portion 40 integrally formed with the general portion 41. The engagement portion 40 is press - fitted into the gasket fixing groove portion 24 described above and is accommodated, held, and fixed in the gasket fixing groove portion 24. In the closed state shown in FIG. 2, the general portion 41 is compressed between the general holding groove portion 25 of the case flange portion 21 and the lid flange general portion 32 of the lid flange portion 31, and seals the gap 6 between the two.

[0060] In the vehicle electrical device box 1 of the first embodiment, the gasket 4 is accommodated and held in the gasket accommodation region 61 on the radially inner side of the gap 6 between the case flange portion 21 and the lid flange portion 31, and the interference portion 5 protrudes into the outer region 62 on the radially outer side of the gap 6 with respect to the gasket accommodation region 61.

[0061] Due to the presence of such an interference portion 5, the pressure loss in the fluid flow path (i.e., the gap 6) from the outside to the accommodation space 29 increases compared to the case where the interference portion 5 does not exist. As a result, the amount of fluid reaching the gasket 4 on the downstream side of the fluid flow path from the interference portion 5 is reduced, and the heat acting on the gasket 4 is also reduced. According to the vehicle electrical device box 1 of the first embodiment, deterioration of the gasket 4 due to heat from the outside can be suppressed, and thus, it is possible to improve the heat insulation performance of the joint portion between the lid 3 and the case 2.

[0062] (Second Embodiment) The vehicle electrical device box 1 of the second embodiment is substantially the same as the vehicle electrical device box 1 of the first embodiment except for the shapes of the case flange portion 21 and the lid flange portion 31. FIG. 3 shows an explanatory diagram schematically explaining the state of the vehicle electrical device box 1 of the second embodiment cut at the same position as the A-A position in FIG. 1. Hereinafter, the vehicle electrical device box 1 of the second embodiment will be described with a focus on the differences from the vehicle electrical device box 1 of the first embodiment.

[0063] As shown in FIG. 3, the lid flange portion 31 in the vehicle electrical device box 1 of the second embodiment has three interference portions 5. Each interference portion 5 is arranged along the radially inner - radially outer direction. In other words, each interference portion 5 is arranged along the fluid flow path from the outside to the accommodation space 29.

[0064] Each interference portion 5 has a rib - like shape that inclines from the radially inner side and the upper side toward the radially outer side and the lower side. Each interference portion 5 can also be said to protrude in the inclined direction from the accommodation space 29 side toward the outside.

[0065] Since the vehicle electrical device box 1 of Example 2 has a plurality of interference portions 5, the interference portions 5 interfere with the fluid flowing from the outside toward the accommodation space 29 a plurality of times or frequently. Further, since each interference portion 5 protrudes in the inclined direction from the accommodation space 29 side toward the outside, it guides the flow direction of the fluid to turn back toward the outside. According to the vehicle electrical device box 1 of Example 2, the pressure loss in the fluid flow path from the outside toward the accommodation space 29 is efficiently increased. Therefore, according to the vehicle electrical device box 1 of Example 2, the deterioration of the gasket 4 due to the heat from the outside can be more effectively suppressed, and thus, the heat insulation performance of the joint portion between the lid 3 and the case 2 can be more effectively improved.

[0066] (Example 3) The vehicle electrical device box 1 of Example 3 is substantially the same as the vehicle electrical device box 1 of Example 1 except for the shapes of the case flange portion 21 and the lid flange portion 31. FIG. 4 shows an explanatory diagram schematically explaining the state of the vehicle electrical device box 1 of Example 3 cut at the same position as the A-A position in FIG. 1. Hereinafter, the vehicle electrical device box 1 of Example 3 will be described centering on the differences from the vehicle electrical device box 1 of Example 1.

[0067] As shown in FIG. 4, in the vehicle electrical device box 1 of Example 3, the lid flange portion 31 has a plurality of lid interference portions 53, and the case flange portion 21 has a plurality of case interference portions 52. Each lid interference portion 53 is arranged in the flow path direction of the outer region 62, that is, in the radially inner - radially outer direction. Each case interference portion 52 is also arranged in the radially inner - radially outer direction.

[0068] In such a vehicle electrical device box 1 of Embodiment 3, the case interference portion 52 and the lid interference portion 53 are adjacent to each other in the radial inner - radial outer direction and are arranged alternately. Therefore, in the vehicle electrical device box 1 of Embodiment 3, the guiding path of the fluid by the interference portion 5 bends complexly in the thickness direction of the gap 6, and the interference portion 5 interferes with the fluid flowing from the outside to the accommodation space 29 a plurality of times or frequently, and the flow path length of the fluid becomes long.

[0069] As a result, also in the vehicle electrical device box 1 of Embodiment 3, the pressure loss in the fluid flow path from the outside to the accommodation space 29 increases efficiently. Consequently, the deterioration of the gasket 4 due to the heat from the outside can be suppressed more effectively, and thus, it is possible to more effectively improve the heat insulation performance of the joint portion between the lid 3 and the case 2.

[0070] Although the present invention has been described above, the present invention is not limited to the above - described embodiments and the like. It is possible to appropriately extract and combine the elements described in the above - described embodiments and the like for implementation, and to make various changes without departing from the gist of the present invention. In addition, the specification of the present invention discloses a technical idea in which the matters described in each claim are appropriately combined, not limited to the citation relationship of each claim at the time of filing.

Explanation of Reference Numerals

[0071] 1: Vehicle electrical device box 2: Case 20: Opening 21: Case flange portion 29: Accommodation space 3: Lid 31: Lid flange portion 4: Gasket 5: Interference portion 6: Gap 61: Gasket accommodation region 62: Outer region

Claims

1. A case having an accommodation space that opens to the outside, a lid that closes the opening of the case, and a gasket disposed between the case and the lid, The case has a case flange portion that is at the peripheral edge of the opening, extends in the circumferential direction of the opening, and protrudes in the radial direction of the opening. The lid has a lid flange portion that faces the case flange portion. In a closed state where the lid closes the opening of the case, a gap is formed between the case flange portion and the lid flange portion. The gap has a gasket accommodation region that accommodates and holds the gasket, and an outer region that is on the outside of the gasket accommodation region. At least one of the case flange portion and the lid flange portion has an interference portion that protrudes into the outer region and interferes with a fluid flow path from the outside to the accommodation space, a vehicle electrical device box.

2. The gasket accommodation region and the outer region are continuously provided over the entire circumference of the peripheral edge of the opening. The gasket is continuously arranged in the gasket accommodation region over the entire circumference of the peripheral edge of the opening. The vehicle electrical device box according to claim 1.

3. A plurality of the interference portions exist in the flow path direction of the outer region from the outside to the accommodation space. The vehicle electrical device box according to claim 1 or claim 2.

4. Both the case flange portion and the lid flange portion have the interference portion. The interference portion of the case flange portion and the interference portion of the lid flange portion are adjacent to each other in the flow path direction of the outer region. The vehicle electrical device box according to claim 3.

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