WO2024058184A1 - Electrical junction box - Google Patents

Abstract

An electrical junction box (100) comprising: a housing (50) that has a fixation wall to be fixed to an object and that is provided with electronic components such as a relay (40) and a fuse (60); and a plate-like busbar (10) erected in an intersecting direction with the fixation wall and connected to the electronic components, wherein a plurality of heat dissipation fins (72), which are erected in the intersecting direction and which are for dissipating heat of the busbar (10), are provided.

Description

electrical junction box

The present disclosure relates to an electrical junction box.
This disclosure claims priority based on Japanese Application No. 2022-146342 filed on September 14, 2022, and incorporates by reference all of the contents of the above-mentioned Japanese application.

Conventionally, many vehicles are equipped with an electrical connection device that is interposed between a power source and electrical components to supply power.

Patent Document 1 discloses an electrical connection device including a housing that accommodates an electromagnetic relay, and in which the housing is provided with an opening in the vicinity of the electromagnetic relay to radiate heat inside the housing to the outside. Disclosed.

JP2021-83160A

An electrical junction box according to an embodiment of the present disclosure includes a casing that has a fixed wall fixed to an object and is provided with an electronic component, and a casing that is erected in a direction crossing the fixed wall and connected to the electronic component. The electrical connection box is provided with a board-shaped bus bar, and is provided with a plurality of heat radiating plates that are erected in the cross direction and radiate heat from the bus bar.

1 is a perspective view of an electrical connection box according to Embodiment 1. FIG. 1 is a plan view of an electrical connection box according to Embodiment 1. FIG. FIG. 3 is a bottom view of the electrical connection box according to the first embodiment. FIG. 2 is a plan view showing the electrical connection box according to the first embodiment with the upper case removed. 5 is a view taken along arrow V in FIG. 4. FIG. 5 is a view taken along arrow VI in FIG. 4. FIG. FIG. 3 is a bottom view showing a state in which a positioning portion is provided in the upper case of the electrical connection box. FIG. 7 is a plan view of the electrical connection box according to the second embodiment with the upper case removed. FIG. 7 is a plan view of the electrical connection box according to the third embodiment with the upper case removed.

[Problems to be solved by this disclosure]
For example, in the case of electronic components such as relays that generate heat when energized, it is virtually impossible to expect a large heat dissipation effect from heat dissipation from the electronic component itself, and it is possible to dissipate heat through the bus bar connected to the electronic component and exposed to the air. heat dissipation is more efficient.

However, in the electrical connection device of Patent Document 1, the opening is provided in the housing at a position near the electromagnetic relay, and heat is only radiated to the electromagnetic relay itself, and heat radiation through the bus bar is not devised. Therefore, it is difficult to say that the heat from the electromagnetic relay is dissipated efficiently.

Therefore, it is an object of the present invention to provide an electrical connection box that can more effectively radiate heat from electronic components that generate heat when energized.

[Effects of this disclosure]
According to the present disclosure, it is possible to more effectively radiate heat from electronic components that generate heat when energized.

[Description of embodiments of the present invention]
First, embodiments of the present disclosure will be listed and described. Furthermore, at least some of the embodiments described below may be combined arbitrarily.

(1) An electrical junction box according to an embodiment of the present disclosure has a fixed wall fixed to an object, and includes a housing provided with an electronic component, and a housing that is erected in a direction crossing the fixed wall, and has a fixed wall fixed to an object. The electrical connection box includes a plate-shaped bus bar connected to a component, and includes a plurality of heat radiating plates that are erected in the intersecting direction and radiate heat from the bus bar.

In this embodiment, since the plurality of heat radiating plates are provided, the heat generated in the electronic component during energization and transmitted to the bus bar can be quickly radiated, and the heat can be radiated from the electronic component more effectively.

(2) The electrical junction box according to the embodiment of the present disclosure includes a base plate whose first main surface is in contact with one main surface of the bus bar, and the plurality of heat sinks are arranged on the second main surface of the base plate. It is provided.

In this embodiment, heat generated in the electronic component when energized is transmitted to the bus bar, and is conducted to the plurality of heat sinks via the base plate, and the plurality of heat sinks quickly radiate the heat. . Therefore, heat can be effectively radiated from the electronic component.

(3) In the electrical connection box according to the embodiment of the present disclosure, a first through hole is formed in a facing wall facing the fixed wall, and the first through hole is formed in a facing wall opposite to the fixed wall and the facing wall. It is formed at a position corresponding to the gap between adjacent heat sinks in the direction.

In this embodiment, the first through hole is formed at a position corresponding to a gap between adjacent heat sinks in the opposing direction. Therefore, the outside air flowing into the housing from the first through hole quickly flows into the gap between the heat sinks, air-cools the heat sinks, and fills the gap between the heat sinks containing the radiated heat. The air rises and quickly flows out of the housing through the first through hole. Therefore, heat can be effectively radiated from the electronic component.

(4) In the electrical junction box according to the embodiment of the present disclosure, a second through hole is formed in the fixed wall, and the second through hole is located at a position corresponding to the first through hole in the opposing direction. is formed.

In this embodiment, the first through hole and the second through hole are formed to face each other at positions corresponding to the gaps between adjacent heat sinks in the opposing direction. For example, the outside air flowing into the housing from the second through hole quickly flows into the gap between the heat sinks, air-cools the heat sinks, and fills the gap between the heat sinks containing the radiated heat. The air rises and quickly flows out of the housing through the first through hole. Therefore, heat can be effectively radiated from the electronic component.

(5) In the electrical junction box according to the embodiment of the present disclosure, a third through hole is formed in the opposing wall, and the third through hole corresponds to the other main surface of the bus bar in the opposing direction. The third through hole extends along the other main surface of the bus bar, and the first through hole extends along the heat sink.

In this embodiment, the third through hole is formed near a position corresponding to the other main surface of the bus bar in the opposing direction. Therefore, the outside air flowing into the housing from the third through hole quickly flows to the other main surface of the bus bar, air-cools the bus bar, and the air containing heat radiated from the bus bar rises. Then, the liquid immediately flows out of the casing through the third through hole. Therefore, heat can be effectively radiated from the electronic component.

(6) In the electrical junction box according to the embodiment of the present disclosure, a fourth through hole is formed in the fixed wall, and the fourth through hole is located at a position corresponding to the third through hole in the opposing direction. The fourth through hole extends along the other main surface of the bus bar, and the second through hole extends along the heat sink.

In the present embodiment, the third through hole is formed in the opposite wall in the vicinity of a position corresponding to the other main surface of the bus bar in the opposite direction, and the third through hole is formed in the opposite direction in the vicinity of a position corresponding to the other main surface of the bus bar. The fourth through hole is formed at opposing positions. For example, the outside air flowing into the housing from the fourth through hole quickly flows to the other main surface of the bus bar, air-cools the bus bar, and the air containing heat radiated from the bus bar rises. Then, the liquid immediately flows out of the casing through the third through hole. Therefore, heat can be effectively radiated from the electronic component.

(7) In the electrical junction box according to the embodiment of the present disclosure, the base plate and the plurality of heat sinks are integrally formed, and the fixed wall or the opposing wall has a positioning portion that determines the position of the heat sink. is provided.

In this embodiment, the positioning portion is used to determine the position of the heat sink during assembly, so the workability of the assembly work can be improved.

(8) In the electrical junction box according to the embodiment of the present disclosure, the bus bar has a rectangular shape, and the electronic components are connected to both ends, and the heat sink extends from near one end of the bus bar to the other end. It is located nearby.

In this embodiment, the heat sink is provided from near one end of the bus bar to near the other end. Therefore, it is possible to more efficiently cool both ends of the bus bar, where heat is generated intensively when energized.

(9) In the electrical connection box according to the embodiment of the present disclosure, the number of heat sinks is greater in the vicinity of the connection portion between the bus bar and the electronic component than in other parts.

In this embodiment, the number of heat sinks near the connection portion between the bus bar and the electronic component is greater than in other parts. Therefore, it is possible to more efficiently cool both ends of the bus bar, where heat is generated intensively when energized.

(10) In the electrical connection box according to the embodiment of the present disclosure, the first through holes are plural, and one of the plurality of first through holes is formed near an end of the bus bar. The hole is larger than the other first through holes.

In this embodiment, the size of one first through hole formed near the end of the bus bar is larger than the other first through holes. Therefore, the inflow of outside air into the end portion of the bus bar and the outflow of air containing heat radiated from the end portion are increased, and the heat generated at the end portion during energization can be cooled more efficiently.

(11) In the electrical junction box according to the embodiment of the present disclosure, there is a plurality of second through holes, and among the plurality of second through holes, one of the second through holes corresponds to the one first through hole in the opposing direction. The second through hole is larger than the other second through holes.

In the present embodiment, the size of the one first through hole formed near the end of the bus bar in the opposing wall is larger than the other first through holes, and The second through hole provided at a position corresponding to the first through hole is larger than the other second through holes. Therefore, the inflow of outside air into the end of the bus bar and the outflow of air containing heat radiated from the end are increased, and the heat generated at the end when energized can be cooled more efficiently.

[Details of embodiments of the present invention]
An electrical connection box according to an embodiment of the present disclosure will be described below with reference to the drawings. Note that the present invention is not limited to these examples, but is indicated by the scope of the claims, and is intended to include all changes within the meaning and scope equivalent to the scope of the claims.

(Embodiment 1)
FIG. 1 is a perspective view of the electrical junction box 100 according to the first embodiment, FIG. 2 is a plan view of the electrical junction box 100 according to the first embodiment, and FIG. 3 is a perspective view of the electrical junction box 100 according to the first embodiment. 100 is a bottom view. In FIGS. 2 and 3, the positions of a bus bar 10 and a heat radiating member 70, which will be described later, are indicated by broken lines.

The electrical connection box 100 is attached to the outside of an object to which it is attached, such as a battery pack 200 of an EV (Electric Vehicle), for example. In FIG. 1, for convenience, the electrical connection box 100 is shown attached to the battery pack 200.

The electrical connection box 100 includes, for example, a housing 50 that houses at least one relay 40 (electronic component), a fuse 60 (electronic component), a board, and the like. The housing 50 has a substantially rectangular shape in plan view, and is made of resin, for example.

The housing 50 includes a lower case 30 that is attached to the mounting target, and an upper case 20 that partially covers the lower case 30. Electronic components such as a relay 40, a fuse 60, and a bus bar 10 are attached to the lower case 30, and the upper case 20 covers some of these electronic components.
Hereinafter, for convenience of explanation, the upper case 20 side will be described as the top and the lower case 30 side will be described as the bottom.

4 is a plan view showing a state in which the upper case 20 is removed in the electrical connection box 100 according to the first embodiment, FIG. 5 is a view taken in the direction of arrow V in FIG. 4, and FIG. FIG. 4 is a view taken along arrow VI of FIG. FIG. 6 shows a state in which parts at both ends of the lower case 30 have been further removed.

The lower case 30 has a flat box shape with one side open on the upper case 20 side. The lower case 30 has a substantially rectangular bottom wall 31 (fixed wall) whose outer side is fixed in contact with the mounting target, and a side wall 33 extending perpendicularly from the edge of the bottom wall 31 toward the upper case 20 side. . As described above, the relay 40, the fuse 60, and the bus bar 10 are provided inside the lower case 30.

Among the side walls 33 of the lower case 30, engagement protrusions 35 that engage with engagement portions 25 of the upper case 20, which will be described later, are protrudingly provided at a plurality of locations on the outer surface of the side wall 33 on the long side of the bottom wall 31. ing. The engagement protrusion 35 consists of a pair of protrusions separated from each other in the length direction of the side wall 33.
Further, in the bottom wall 31, fixing holes 37 are formed at the four corners and near the side wall 33 on one long side, which are used when attaching the lower case 30 (casing 50) to an object to be mounted.

As shown in FIGS. 4 to 6, the lower case 30 is provided with, for example, one relay 40 and a fuse 60 separated from each other in the length direction of the lower case 30. A relay 40 is provided at one end of the lower case 30. Further, a fuse 60 is provided at the other end of the lower case 30. That is, the fuse 60 is provided near one side wall 33 of the lower case 30 in the width direction. The relay 40 is provided with a connection terminal (not shown) on the other side wall 33 side in the width direction.

A bus bar 10 is provided between the relay 40 and the fuse 60. The bus bar 10 is made of a conductive metal plate made of copper or the like and has a rectangular plate shape, and is erected on the inner surface of the bottom wall 31 . The bus bar 10 has one end 11 (connection part) screwed to the connection terminal of the relay 40 and the other end 12 (connection part) screwed to the connection terminal 61 of the fuse 60. Fixing through holes for screwing are formed in one end 11 and the other end 12. For example, an oval fixing through hole 121 is formed at the other end 12, and a similar fixing through hole (not shown) is also formed at the one end 11, which allows for design errors. , and can accommodate tolerances. In FIG. 6, for convenience of explanation, the screw is removed from the other end 12.
In addition, below, the one end part 11 and the other end part 12 are also collectively called both end parts 11 and 12.

That is, the bus bar 10 extends obliquely from the connection terminal 61 of the fuse 60 toward the connection terminal of the relay 40. Specifically, one end 11 and the other end 12 of the bus bar 10 are bent so as to face the corresponding side wall 33, and the intermediate portion 13 excluding the one end 11 and the other end 12 extends linearly. .

As described above, the bus bar 10 is erected substantially perpendicularly to the bottom wall 31. A heat radiating member 70 is screwed to the intermediate portion 13 of the bus bar 10 to radiate heat generated by the bus bar 10 when energized. That is, in the bus bar 10, the heat radiating member 70 is provided from near one end 11 to near the other end 12.

The heat dissipation member 70 has a comb shape in plan view, and includes a base plate 71 and a plurality of heat dissipation fins 72 (heat dissipation plates).
The base plate 71 is made of a material with good thermal conductivity, such as aluminum, and has a rectangular shape that follows the intermediate portion 13 of the bus bar 10 . One principal surface (first principal surface) of the base plate 71 is in contact with one principal surface of the intermediate portion 13 of the bus bar 10 . A plurality of radiation fins 72 are provided on the other main surface (second main surface) of the base plate 71 .

Each radiation fin 72 has a rectangular plate shape and is made of the same material as the base plate 71. For example, the radiation fins 72 and the base plate 71 are integrally formed. The heat dissipation fins 72 are erected substantially perpendicularly from the base plate 71. The plurality of radiation fins 72 are arranged in parallel at predetermined intervals in the longitudinal direction of the bus bar 10 (intermediate portion 13).

Furthermore, in the lower case 30, a plurality of types of through holes 32 with different attributes are formed in the bottom wall 31. More specifically, in the bottom wall 31, a plurality of through holes 321 (second through hole), through holes 322 (fourth through hole), through holes 323, and through holes 324 are formed in the vicinity of the bus bar 10. .

Each through hole 321 connects adjacent radiation fins 7 in a direction perpendicular to the bottom wall 31, that is, in a direction in which the bottom wall 31 and the ceiling wall 21 of the upper case 20 are opposed to each other (hereinafter simply referred to as the "facing direction"). (See FIG. 4). In other words, the area directly above each through hole 321 corresponds to between the radiation fins 72 . Each through hole 321 has a substantially rectangular shape extending along the radiation fin 72, and is formed so that the closer it is to both ends 11 and 12 of the bus bar 10, the shorter the length thereof.

Each through hole 322 is formed at a position corresponding to the other main surface of the bus bar 10 in the opposing direction. That is, in the bottom wall 31, each through-hole 322 is formed at a position opposite to the heat radiating member 70 from a position aligned with the position of the intermediate portion 13 in the opposing direction, a little apart (see FIG. 3). Each through hole 322 has a rectangular shape extending along the bus bar 10 (the other main surface). In this embodiment, two through holes 322 are formed.

Each through hole 323 is formed near the other main surface of the bus bar 10 and away from the through hole 322. Each through hole 323 has a substantially rectangular shape extending in the width direction of the bottom wall 31. Each through hole 323 is formed so that its length increases as it approaches the other end 12 of the bus bar 10.

Each through hole 324 is formed near the other end 12 of the bus bar 10. That is, in the bottom wall 31, through-holes 322 are formed at positions that are aligned with the position of the other end 12 in the opposing direction and slightly spaced apart from each other in the thickness direction of the other end 12 on opposite sides (see FIG. (See 3). The two through holes 324 are substantially rectangular extending along the other end 12 and have different lengths.

A positioning portion 36 is provided protruding from the bottom wall 31 to determine the position of the heat radiating member 70 (radiating fin 72) during assembly work. Positioning portions 36 are provided near the radiation fins 72 at both ends in the direction in which the radiation fins 72 are arranged side by side. Specifically, in the opposing direction, a position corresponding to the gap between the radiation fin 72 at one end and the adjacent radiation fin 72 among the radiation fins 72 at both ends, and a position corresponding to the gap between the radiation fin 72 at the other end and the radiation fin adjacent thereto. Positioning portions 36 are provided at positions corresponding to the gaps 72, respectively. The positioning portion 36 has a C-shape in plan view, and the open end portions abut against the inner surfaces of the heat radiation fins 72 at both ends, thereby determining the position of the heat radiation member 70.

The upper case 20 has a box shape with one side open on the lower case 30 side. The upper case 20 is slightly smaller than the lower case 30 in a length direction and a width direction perpendicular to the length direction.

The upper case 20 also includes a ceiling wall 21 (opposing wall) that faces the bottom wall 31 of the lower case 30, and a side wall 22 that is provided around the edge of the ceiling wall 21 and extends toward the lower case 30. (see Figure 1).

Furthermore, in the upper case 20, a plurality of types of through holes 23 with different attributes are formed in the ceiling wall 21. More specifically, in the ceiling wall 21, a plurality of through holes 231 (first through hole), through holes 232 (third through hole), through holes 233, and through holes 234 are formed in the vicinity of the bus bar 10. .

Each through hole 231 is formed at a position corresponding to the gap between adjacent radiation fins 72 in the opposing direction between the ceiling wall 21 and the bottom wall 31 of the lower case 30 (see FIG. 2). In other words, the area directly below each through hole 231 corresponds to between the radiation fins 72 . Each through hole 231 has a substantially rectangular shape extending along the radiation fin 72, and is formed so that the closer it is to both ends 11 and 12 of the bus bar 10, the shorter the length thereof. The through hole 231 of the upper case 20 is formed at a position corresponding to the through hole 321 of the lower case 30 in the opposing direction, and has the same shape as the through hole 321.

Each through hole 232 is formed near a position corresponding to the other main surface of the bus bar 10 in the opposing direction. That is, in the ceiling wall 21, each through hole 232 is formed at a position opposite to the heat radiating member 70 and a little apart from a position that matches the position of the intermediate portion 13 in the opposing direction (see FIG. 2). Each through hole 232 has a rectangular shape extending along the bus bar 10 (the other main surface). In this embodiment, two through holes 232 are formed. The through hole 232 of the upper case 20 is formed at a position corresponding to the through hole 322 of the lower case 30 in the opposing direction, and has the same shape as the through hole 322.

Each through hole 233 is formed near the other main surface of the bus bar 10 and away from the through hole 232. Each through hole 233 has a substantially rectangular shape extending in the width direction of the ceiling wall 21 . Each through hole 233 is formed so that the closer it is to the other end 12 of the bus bar 10, the longer it becomes. The through hole 233 of the upper case 20 is formed at a position corresponding to the through hole 323 of the lower case 30 in the opposing direction, and has the same shape as the through hole 323.

Each through hole 234 is formed near the other end 12 of the bus bar 10. That is, in the ceiling wall 21, through holes 234 are formed at positions that are aligned with the position of the other end 12 in the opposing direction, and slightly spaced apart from each other in the thickness direction of the other end 12 (see FIG. (see 2). The two through holes 234 have a substantially rectangular shape extending along the other end 12 and have different lengths. The through hole 234 of the upper case 20 is formed at a position corresponding to the through hole 324 of the lower case 30 in the opposing direction, and has the same shape as the through hole 324.

In addition, each through-hole 231, each through-hole 232, each through-hole 233, and each through-hole 234 of the upper case 20, and each through-hole 321, each through-hole 322, each through-hole 323, and each through-hole 324 of the lower case 30 The width is such that the fingertip of the person handling it cannot fit therein, for example, several millimeters.

Furthermore, a plurality of side wall through holes 24 are formed in the side wall 22 of the upper case 20, extending to the end of the ceiling wall 21. A plurality of side wall through holes 24 are formed in the two side walls 22 facing each other in the width direction of the ceiling wall 21 in the vicinity of the bus bar 10, that is, in the vicinity of the through hole 23, respectively. The side wall through holes 24 are arranged in parallel at regular intervals in the length direction of the upper case 20.

The side wall 22 is provided with engaging portions 25 that engage with the engaging protrusions 35 of the lower case 30 at multiple locations on the lower end. The engaging portion 25 has a U-shape, both open end portions are fixed to the side wall 22, and the curved portion projects downward from the side wall 22. When assembling the upper case 20 and the lower case 30, the engaging protrusion 35 of the lower case 30 passes between the edge of the side wall 22 and the curved part of the engaging part 25 from inside the engaging part 25. , the engagement protrusion 35 and the engagement portion 25 are engaged (see FIG. 1).

In the electrical junction box 100, a current in the range of 300A to 1000A is used. When current flows, heat is generated from the relay 40 and fuse 60, and the heat from the relay 40 and fuse 60 is immediately transferred to the bus bar 10 that is in direct contact with it. The heat emitted from the relay 40 and the fuse 60 may have a negative effect on the electronic components around the relay 40, the fuse 60, and the bus bar 10, so it is necessary to cool them down quickly. However, the heat dissipation effect of heat dissipation from the relay 40 and fuse 60 itself cannot be expected to be large, and heat dissipation via the bus bar 10 connected to the relay 40 and fuse 60 is more efficient.

In contrast, in the electrical connection box 100 of this embodiment, the heat radiating member 70 is provided on the bus bar 10. When energized, the heat transferred from the relay 40 and fuse 60 to the bus bar 10 and the heat generated in the bus bar 10 are quickly transferred to the base plate 71 of the heat dissipation member 70 that is in direct contact with the bus bar 10 and are dissipated into the air via the heat dissipation fins 72. Heat is radiated to Therefore, the heat generated from the relay 40 and the fuse 60 can be efficiently dissipated via the bus bar 10, and the heat generated at the bus bar 10 can also be appropriately dissipated, so that the above-mentioned problems can be prevented in advance.

Further, a large current (for example, 1000 A) cannot be used for a long time due to safety issues and the problem that a large amount of heat is generated in the bus bar 10, and is used intermittently for short periods of time. In this way, when using a large current, the time for the large current to flow is short, so rather than generating heat in the entire bus bar 10, heat is generated at the connection part with the relay 40 and fuse 60, that is, at both ends 11 and 12 of the bus bar 10. A concentrated fever occurs.

In preparation for this, in the electrical connection box 100 of this embodiment, a heat radiating member 70 is provided from near one end 11 of the bus bar 10 to near the other end 12. That is, the heat radiating member 70 is also provided near both ends 11 and 12 of the bus bar 10. Therefore, as described above, even when a large current flows and heat is concentrated at both ends 11 and 12 of bus bar 10, heat can be effectively radiated from bus bar 10, relay 40, and fuse 60.

Further, in the electrical junction box 100 of the present embodiment, as described above, the through holes 231, 232, 233, and 234 are formed near the bus bar 10 in the upper case 20, and the through holes 231, 232, 233, and 234 are formed in the vicinity of the bus bar 10 in the lower case 30. A through hole 321, a through hole 322, a through hole 323, and a through hole 324 are formed near the. Therefore, air can easily flow into the bus bar 10 and the heat radiating member 70 from the outside, and the air cooling effect can be enhanced.

Furthermore, in the electrical junction box 100 of the present embodiment, as described above, the through holes 231 of the upper case 20 and the through holes 321 of the lower case 30 are located at positions corresponding to the gaps between the adjacent radiation fins 72 in the opposing direction. is formed. Therefore, external air flows into between the heat radiation fins 72 and internal air flows out from between the heat radiation fins 72 without stagnation and is performed promptly.

In addition, since the through hole 231 and the through hole 321 face each other in the opposing direction, the through hole 231, the gap between the adjacent radiation fins 72, and the through hole 321 form a straight line in the opposing direction. It is located. Therefore, for example, air flowing in through the through hole 231 (through hole 321) passes between the radiation fins 72 and quickly flows out from the through hole 321 (through hole 231) as it is. At this time, since the air between the radiation fins 72 containing the heat convected from the radiation fins 72 flows to the outside of the casing 50, the effect of cooling the relay 40, the fuse 60, and the bus bar 10 can be further enhanced.

Furthermore, in the electrical connection box 100 of the present embodiment, as described above, the through holes 232 of the upper case 20 and the through holes 322 of the lower case 30 are formed at positions corresponding to the other main surface of the bus bar 10 in the opposing direction. and facing each other. Therefore, for example, air flowing in through the through hole 232 (through hole 322) can flow over the other main surface of the bus bar 10 and directly flow out from the through hole 322 (through hole 232). Thereby, in addition to the cooling effect of the heat radiating member 70, the cooling effect of the relay 40, the fuse 60, and the bus bar 10 can be enhanced.

In the electrical junction box 100 of this embodiment, as described above, the through hole 234 of the upper case 20 and the through hole 324 of the lower case 30 are formed near the other end 12 of the bus bar 10, and They face each other in opposite directions. Therefore, for example, air flowing in through the through hole 234 (through hole 324) can flow on both main surfaces of the other end portion 12 and directly flow out from the through hole 324 (through hole 234). Thereby, the other end portion 12 can be cooled more intensively, and it is possible to cope with the case where a large current flows and heat generation is concentrated at the other end portion 12 of the bus bar 10.

In the above description, the positioning part 36 is provided on the bottom wall 31 of the lower case 30 as an example, but the positioning part 36 is not limited to this, and may be provided on the upper case 20.

FIG. 7 is a bottom view showing a state in which the positioning portion 36 is provided in the upper case 20 in the electrical connection box 100. For convenience, FIG. 7 shows a state in which the lower case 30 is removed.
The positioning section 36 determines the position of the heat radiation member 70 (radiation fin 72) similarly to the positioning section 36 described above. The positioning portion 36 is provided to protrude from the inner surface of the ceiling wall 21 of the upper case 20. The positioning portions 36 are provided near the radiation fins 72 at both ends in the direction in which the radiation fins 72 are arranged side by side. Specifically, in the opposing direction, a position corresponding to the gap between the radiation fin 72 at one end and the adjacent radiation fin 72 among the radiation fins 72 at both ends, and a position corresponding to the gap between the radiation fin 72 at the other end and the radiation fin adjacent thereto. Positioning portions 36 are provided at positions corresponding to the gaps 72, respectively. The shape of the positioning portion 36 is the same as the shape of the positioning portion 36 described above, and detailed description thereof will be omitted.

(Embodiment 2)
FIG. 8 is a plan view of the electrical connection box 100 according to the second embodiment with the upper case 20 removed. In FIG. 8, the vicinity of the bus bar 10 is shown enlarged for convenience.

In the electrical connection box 100 of the second embodiment, as in the first embodiment, a plurality of types of through holes 32 with different attributes are formed in the bottom wall 31 of the lower case 30. That is, in the bottom wall 31, a plurality of through holes 321 (second through hole), a through hole 322 (fourth through hole), a through hole 323, and a through hole 324 are formed in the vicinity of the bus bar 10, respectively.

Each through hole 321 is formed at a position corresponding to the gap between adjacent radiation fins 72 in a direction perpendicular to the bottom wall 31, that is, in the opposing direction (see FIG. 3). That is, the area directly above each through hole 321 corresponds to between the radiation fins 72 . Each through hole 321 extends along the radiation fin 72 and has a substantially rectangular shape.

In the electrical junction box 100 of the second embodiment, among the plurality of through holes 321, the through holes 321A formed near the one end 11 and the other end 12 of the bus bar 10 are formed larger than the other through holes 321. has been done. More specifically, the through holes 321A formed near the one end 11 and the other end 12 of the bus bar 10 have a larger ratio of the through hole to the gap between adjacent radiation fins 72 than the other through holes 321.

Other than that, the through holes 322, 323, and 324 are the same as in Embodiment 1, and detailed explanations will be omitted.

As described above, in the electrical junction box 100 of the second embodiment, among the plurality of through holes 321, the through hole 321A formed closer to the one end 11 and the other end 12 of the bus bar 10 is smaller than the other through holes 321. It's also big. Therefore, the amount of air flowing in from the through hole 321A becomes relatively large, and thereby the one end 11 and the other end 12 can be cooled more intensively, and a large current flows to both ends of the bus bar 10. 11 and 12 can handle cases where heat generation is concentrated.

In the above, among the plurality of through holes 321 formed in the lower case 30, the through holes 321A formed near the one end 11 and the other end 12 of the bus bar 10 are formed larger than the other through holes 321. Although the explanation has been given using an example of a case in which the above-mentioned cases are performed, the present invention is not limited to this. For example, the upper case 20 may be configured in a similar manner.

Among the plurality of through holes 231 formed in the upper case 20, the through holes 231 formed near the one end 11 and the other end 12 of the bus bar 10 may be formed larger than the other through holes 231. . That is, the through hole 231 corresponding to the through hole 321A of the lower case 30 may be formed to be larger than the other through holes 231 in the opposing direction.

The same parts as in Embodiment 1 are given the same reference numerals and detailed explanations are omitted.

(Embodiment 3)
FIG. 9 is a plan view of the electrical connection box 100 according to the third embodiment with the upper case 20 removed. In FIG. 9, the vicinity of the bus bar 10 is shown enlarged for convenience.

The electrical connection box 100 of the third embodiment includes a bus bar 10, as in the first embodiment, and a heat dissipation member 70 is attached to the middle portion 13 of the bus bar 10 to dissipate heat generated by the bus bar 10 when current is applied. The heat dissipation member 70 is comb-shaped and includes a base plate 71 and a plurality of heat dissipation fins 72 (heat dissipation plates).

The base plate 71 is made of a material with good thermal conductivity, such as aluminum, and has a rectangular shape that follows the intermediate portion 13 of the bus bar 10. One principal surface of the base plate 71 is in contact with one principal surface of the intermediate portion 13 of the bus bar 10, and a plurality of radiation fins 72 are provided on the other principal surface.

Each radiation fin 72 has a rectangular plate shape and is made of the same material as the base plate 71. For example, the radiation fins 72 and the base plate 71 are integrally formed. The heat dissipation fins 72 are erected substantially perpendicularly from the base plate 71. The radiation fins 72 are arranged in parallel in the longitudinal direction of the bus bar 10 (intermediate portion 13).

In the electrical junction box 100 of Embodiment 3, the number of radiation fins 72 is greater in the vicinity of one end 11 and the other end 12 of the bus bar 10 (see the broken line circle in FIG. 9) than in other parts. It is composed of That is, the radiation fins 72 are arranged in a concentrated manner near one end 11 and the other end 12 of the bus bar 10 .

As described above, in the electrical connection box 100 of the third embodiment, more radiation fins 72 are disposed near the one end 11 and the other end 12 of the bus bar 10 than in other parts. As the number of heat dissipating fins 72 increases, the surface area where heat can be dissipated increases, so the efficiency of heat dissipation increases in the vicinity of both ends 11 and 12. Therefore, both end portions 11 and 12 can be cooled more intensively, and it is possible to cope with the case where a large current flows and heat generation is concentrated at both end portions 11 and 12 of bus bar 10.

The same parts as in Embodiment 1 are given the same reference numerals and detailed explanations are omitted.

The technical features (constituent features) described in Embodiments 1 to 3 can be combined with each other, and new technical features can be formed by combining them.
The embodiments disclosed herein are illustrative in all respects and should not be considered restrictive. The scope of the present invention is indicated by the scope of the claims, not the meaning described above, and is intended to include meanings equivalent to the scope of the claims and all changes within the scope.

The items described in each embodiment can be combined with each other. Moreover, the independent claims and dependent claims recited in the claims may be combined with each other in any and all combinations, regardless of the form in which they are cited. Furthermore, although the scope of claims uses a format in which claims refer to two or more other claims (multi-claim format), the invention is not limited to this format. It may also be written using a multi-claim format that cites at least one multi-claim.

10 Bus bar 11 One end 12 Other end 13 Middle part 20 Upper case 21 Ceiling wall 22 Side wall 23, 32 Through hole 24 Side wall through hole 25 Engagement part 30 Lower case 31 Bottom wall 33 Side wall 35 Engagement protrusion 36 Positioning part 37 Fixation Hole 40 Relay 50 Housing 60 Fuse 61 Connection terminal 70 Heat dissipation member 71 Base plate 72 Heat dissipation fin 100 Electrical connection box 121 Fixed through hole 200 Battery pack 231, 232, 233, 234 Through hole 321, 321A, 322, 323, 324 Penetration hole

Claims (11)

1. An electrical connection box comprising: a housing having a fixed wall fixed to an object and provided with electronic components; and a plate-shaped bus bar standing in a direction intersecting the fixed wall and connected to the electronic component. And,
   An electrical connection box including a plurality of heat radiating plates that are erected in the cross direction and radiate heat from the bus bars.
2. a base plate whose first main surface is in contact with one main surface of the bus bar;
   The electrical connection box according to claim 1, wherein the plurality of heat sinks are provided on the second main surface of the base plate.
3. A first through hole is formed in a facing wall facing the fixed wall,
   The electrical connection box according to claim 2, wherein the first through hole is formed at a position corresponding to a gap between adjacent heat sinks in a direction in which the fixed wall and the opposing wall face each other.
4. A second through hole is formed in the fixed wall,
   The electrical connection box according to claim 3, wherein the second through hole is formed at a position corresponding to the first through hole in the opposing direction.
5. A third through hole is formed in the opposing wall,
   The third through hole is formed near a position corresponding to the other main surface of the bus bar in the opposing direction,
   The electrical connection box according to claim 4, wherein the third through hole extends along the other main surface of the bus bar, and the first through hole extends along the heat sink.
6. A fourth through hole is formed in the fixed wall,
   The fourth through hole is formed at a position corresponding to the third through hole in the opposing direction,
   The electrical connection box according to claim 5, wherein the fourth through hole extends along the other main surface of the bus bar, and the second through hole extends along the heat sink.
7. The base plate and the plurality of heat sinks are integrally formed,
   The electrical connection box according to claim 3, wherein the fixed wall or the opposing wall is provided with a positioning part for determining the position of the heat sink.
8. The bus bar has a rectangular shape, and the electronic components are connected to both ends thereof, respectively.
   The electrical connection box according to any one of claims 4 to 6, wherein the heat sink is provided from near one end of the bus bar to near the other end.
9. The electrical connection box according to claim 3, wherein the number of heat sinks is greater in the vicinity of the connection portion between the bus bar and the electronic component than in other portions.
10. the first through holes are plural;
    The electrical connection box according to claim 8, wherein one of the plurality of first through-holes, one of which is formed near an end of the bus bar, is larger than the other first through-holes.
11. the second through holes are plural;
    The electrical connection box according to claim 10, wherein among the plurality of second through-holes, a second through-hole corresponding to the one first through-hole in the opposing direction is larger than other second through-holes.
    

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