Electrical junction box

Abstract

An electrical connection box (100) is provided with: a housing (50) having a fixed wall fixed to an object and provided with a relay (40) and a fuse (60); and a plate-shaped bus bar (10) disposed facing the fixed wall and connected to a relay (40) and a fuse (60), in which the electrical connection box is provided with a plurality of heat dissipation plates that are provided upright in an intersecting direction intersecting with the bus bar (10) and that dissipate heat from the bus bar (10).

Description

Technical Field

[0001] The present disclosure relates to an electrical connection box.

[0002] This application claims the priority based on Japanese application No. 2022-146343 for which it applied on September 14, 2022, and cites all the contents described in the said Japanese application. Background Art

[0003] Conventionally, many vehicles include an electrical connection device for supplying electric power between a power source and electrical components.

[0004] Patent Document 1 discloses an electrical connection device including a housing for housing an electromagnetic relay, wherein an opening for dissipating heat inside the housing to the outside is provided at a position near the electromagnetic relay in the housing.

[0005] Prior art literature

[0006] Patent Literature

[0007] Patent Document 1: Japanese Patent Application Publication No. 2021-83160 Summary of the invention

[0008] An electrical connection box of an embodiment of the present disclosure comprises: a housing having a fixed wall fixed to an object and provided with electronic components; and a plate-shaped bus bar arranged opposite to the fixed wall and connected to the electronic components, wherein the electrical connection box comprises a plurality of heat sinks, the plurality of heat sinks being erected in a direction intersecting the bus bar and dissipating heat from the bus bar. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a perspective view of the electrical junction box according to the first embodiment.

[0010] Figure 2 It is a top view of the electrical junction box according to the first embodiment.

[0011] Figure 3 This is a plan view showing a state in which the upper case is removed in the electrical junction box according to the first embodiment.

[0012] Figure 4 yes Figure 3 A view in the direction of arrow IV.

[0013] Figure 5 yes Figure 2 A cross-sectional view of line VV.

[0014] Figure 6 It is a partial plan view of the electrical junction box according to the second embodiment.

[0015] Figure 7 It is a partial longitudinal sectional view of the electrical junction box of Embodiment 3.

[0016] Figure 8 It is a top view of the electrical junction box according to the fourth embodiment in a state where the upper case is removed. DETAILED DESCRIPTION

[0017] [Problems to be Solved by the Present Disclosure]

[0018] For example, in the case of electronic components such as relays that generate heat when powered on, in fact, it is not possible to expect much heat dissipation effect based on the heat dissipation of the electronic components themselves. Heat dissipation via a bus bar connected to the electronic components and exposed to the air is more efficient.

[0019] However, in the electrical connection device of Patent Document 1, the opening is provided in the housing near the electromagnetic relay, and heat is only dissipated to the electromagnetic relay itself without any method for dissipating heat via the bus bar, so it is difficult to say that the heat of the electromagnetic relay is efficiently dissipated.

[0020] Therefore, an object of the present invention is to provide an electrical junction box capable of more effectively dissipating the heat of electronic components generated when power is supplied.

[0021] [Effects of the present disclosure]

[0022] According to the present disclosure, it is possible to more effectively dissipate the heat of electronic components that generate heat when power is supplied.

[0023] [Description of Embodiments of the Invention]

[0024] First, the embodiments of the present disclosure will be described by way of examples. In addition, at least a part of the embodiments described below may be arbitrarily combined.

[0025] (1) An electrical connection box according to an embodiment of the present disclosure comprises: a housing having a fixed wall fixed to an object and provided with electronic components; and a plate-shaped bus bar arranged opposite to the fixed wall and connected to the electronic components, wherein the electrical connection box comprises a plurality of heat sinks, the plurality of heat sinks being arranged upright in a direction intersecting the bus bar and dissipating heat from the bus bar.

[0026] In the present embodiment, since the plurality of heat dissipation plates are provided, heat generated in the electronic components and transferred to the bus bars when power is supplied can be rapidly dissipated, and heat can be more effectively dissipated from the electronic components.

[0027] (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 wherein the plurality of heat dissipation plates are provided on a second main surface of the base plate.

[0028] In this embodiment, when power is supplied, heat generated by the electronic components is transferred to the busbars and conducted to the plurality of heat sinks via the base plate, and the plurality of heat sinks rapidly dissipate the heat. Therefore, the electronic components can effectively dissipate heat.

[0029] (3) The electrical junction box according to the embodiment of the present disclosure has a first through hole formed in the opposing wall facing the fixed wall, the first through hole being formed at a position corresponding to the gap between adjacent heat sinks in the opposing direction of the fixed wall and the opposing wall.

[0030] In this embodiment, the first through hole is formed at a position corresponding to the gap between the adjacent heat sinks in the relative direction. Therefore, the external air flowing into the housing from the first through hole quickly flows to the gap between the heat sinks, so that the heat sinks are air-cooled, and the air in the gap between the heat sinks containing the heat dissipated rises and quickly flows out to the outside of the housing through the first through hole. Therefore, the electronic components can effectively dissipate heat.

[0031] (4) In the electrical junction box according to the embodiment of the present disclosure, the first through hole extends along the heat dissipation plate.

[0032] In this embodiment, the first through hole extends along the heat dissipation plate, so the size of the first through hole can be effectively ensured in the portion of the opposing wall corresponding to the gap between the adjacent heat dissipation plates.

[0033] (5) In the electrical connection box of the embodiment of the present disclosure, side walls extending toward the fixed wall are continuously provided at the two opposite edges of the opposite wall, and a second through hole is formed in each side wall. The second through holes are respectively formed at positions corresponding to the gaps between adjacent heat sinks in the relative directions of the two side walls.

[0034] In this embodiment, the second through holes are formed at positions corresponding to the gaps between adjacent heat sinks in the relative direction of the two side walls, so that the air flowing in from the second through holes of one side wall passes between the adjacent heat sinks and quickly flows out from the second through holes of the other side wall. At this time, the heat convected from the heat sink also flows out to the outside of the housing, so the cooling effect of the electronic components can be further improved.

[0035] (6) In the electrical junction box according to the embodiment of the present disclosure, the second through hole extends along the heat dissipation plate.

[0036] In this embodiment, the second through hole extends along the heat dissipation plate, so the size of the second through hole can be effectively ensured in the portion of the two side walls corresponding to the gap between the adjacent heat dissipation plates.

[0037] (7) In the electrical junction box according to the embodiment of the present disclosure, the base plate and the plurality of heat dissipation plates are integrally formed, and positioning portions for fixing positions of the heat dissipation plates are provided on the opposing walls.

[0038] In the present embodiment, the positioning portion is used to fix the position of the heat sink during assembly, so that the workability of the assembly operation can be improved.

[0039] (8) In the electrical junction box according to the embodiment of the present disclosure, the heat sink is provided near the connection portion between the bus bar and the electronic component.

[0040] In this embodiment, the heat sink is also provided near the connection portion between the bus bar and the electronic component. Therefore, the connection portion that generates heat intensively when power is supplied can be cooled more effectively.

[0041] (9) In the electrical junction box according to the embodiment of the present disclosure, the number of the heat sinks is greater in the vicinity of the connection portion than in other portions.

[0042] In this embodiment, the number of the heat sinks near the connection portion between the bus bar and the electronic component is greater than that in other portions. Therefore, the connection portion that generates concentrated heat when power is supplied can be cooled more effectively.

[0043] (10) In the electrical connection box of the embodiment of the present disclosure, there are a plurality of first through holes, and one of the plurality of first through holes formed near a connection portion between the bus bar and the electronic component is larger than the other first through holes.

[0044] In this embodiment, the size of a first through hole formed near the connection portion is larger than that of the other first through holes. Therefore, the inflow of external air into the connection portion and the outflow of air containing heat dissipated from the connection portion increase, and the heat generated at the connection portion when power is supplied can be cooled more effectively.

[0045] (11) In the electrical connection box of the embodiment of the present disclosure, there are a plurality of second through holes, and one of the plurality of second through holes formed near a connection portion between the bus bar and the electronic component is larger than the other second through holes.

[0046] In this embodiment, the second through hole provided near the connection portion is larger than the other second through holes. Therefore, the inflow of external air into the connection portion and the outflow of air containing heat dissipated from the connection portion increase, and the heat generated at the connection portion when power is supplied can be cooled more effectively.

[0047] [Details of the embodiments of the present invention]

[0048] Hereinafter, an electric junction box according to an embodiment of the present disclosure will be described with reference to the drawings. It should be noted that the present invention is not limited to these examples, but is indicated by the claims, and is intended to include all modifications within the meaning and scope equivalent to the claims.

[0049] (Implementation method 1)

[0050] Figure 1 is a perspective view of the electrical junction box 100 according to the first embodiment. Figure 2 FIG. 1 is a top view of the electrical junction box 100 according to the first embodiment. Figure 2 In FIG. 1 , the positions of a bus bar 10 and a heat dissipation member 70 described later are indicated by dotted lines.

[0051] The electrical connection box 100 is mounted on the outside of a mounting target (object) such as a battery pack 200 of an EV (Electric Vehicle). Figure 1 , for convenience, the state in which the electrical connection box 100 is installed on the battery pack 200 is shown.

[0052] The electrical junction box 100 includes, for example, a housing 50 that accommodates the relay 40 (electronic component), the fuse 60 (electronic component), a substrate, etc. The housing 50 is substantially rectangular in plan view and is made of, for example, resin.

[0053] The housing 50 includes a lower case 30 mounted on the installation object and an upper case 20 partially covering the lower case 30. Electronic components such as the relay 40, the fuse 60, and the bus bar 10 are mounted on the lower case 30, and the upper case 20 covers a part of these electronic components.

[0054] In the following, for convenience of description, the upper housing 20 side is described as the upper side and the lower housing 30 side is described as the lower side.

[0055] Figure 3 1 is a plan view showing a state in which the upper case 20 is removed in the electrical junction box 100 according to the first embodiment. Figure 4 yes Figure 3 A view in the direction of arrow IV.

[0056] The lower case 30 is in the shape of a flat box 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 contacts and is fixed to the mounting object; and a side wall 33 extending vertically 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.

[0057] Engagement protrusions 35 that engage with the later-described engagement portion 25 of the upper case 20 are protruded at multiple locations on the outer side surface of the side wall 33 on the long side of the bottom wall 31 of the side wall 33 of the lower case 30. The engagement protrusions 35 are composed of a pair of protrusions spaced apart in the longitudinal direction of the side wall 33.

[0058] In addition, fixing holes 37 used when attaching the lower case 30 (housing 50 ) to an attachment object are formed in the bottom wall 31 at four corners and near the side wall 33 on one long side.

[0059] like Figure 3 and Figure 4 As shown in FIG. 1 , on the lower housing 30, the relay 40 and the fuse 60 are arranged spaced apart in the length direction of the lower housing 30. That is, the relay 40 is arranged on one end side of the lower housing 30, and the fuse 60 is arranged on the other end side of the lower housing 30. The fuse 60 is arranged near the side wall 33 on one side in the width direction of the lower housing 30. In addition, the relay 40 is provided with a connection terminal (see FIG. 1 ) on the side wall 33 on the other side in the width direction. Figure 4 ).

[0060] A bus bar 10 is provided between the relay 40 and the fuse 60. The bus bar 10 is substantially plate-shaped, made of a conductive metal plate such as copper, and is disposed opposite to the inner surface of the bottom wall 31. The bus bar 10 includes a flat portion 13 opposite to the bottom wall 31, one end portion 11 (connection portion) screwed to the connection terminal of the relay 40, and the other end portion 12 (connection portion) screwed to the connection terminal 61 of the fuse 60. Hereinafter, the one end portion 11 and the other end portion 12 are collectively referred to as the two end portions 11, 12.

[0061] That is, the bus bar 10 has another end portion 12 in a rectangular plate shape which is continuously provided perpendicularly to the flat portion 13 at an edge of the flat portion 13 near the fuse 60, and has one end portion 11 in a rectangular plate shape which is continuously provided perpendicularly to the flat portion 13 at an edge of the flat portion 13 near the relay 40. The one end portion 11 extends in the width direction of the bottom wall 31, and the end portion on the side wall 33 of the other side is bent along the side wall 33 of the other side and connected to the connection terminal of the relay 40.

[0062] Fixing through holes for screw fastening are formed in the one end portion 11 and the other end portion 12. For example, an oblong fixing through hole (not shown) is formed in the other end portion 12 and the one end portion 11, thereby being able to cope with design errors and tolerances.

[0063] The bus bar 10 is arranged so that one main surface of the flat portion 13 faces the bottom wall 31. A heat dissipation member 70 for dissipating heat generated by the bus bar 10 when power is supplied is screwed to the flat portion 13 of the bus bar 10. The heat dissipation member 70 is provided over most of the flat portion 13 including the vicinity of the one end portion 11 and the vicinity of the other end portion 12.

[0064] The heat dissipation member 70 has a comb shape in a longitudinal cross-sectional view extending in the longitudinal direction of the lower case 30 , and includes a base plate 71 and a plurality of heat dissipation fins 72 (heat dissipation plates).

[0065] The base plate 71 is made of a material with good thermal conductivity such as aluminum and has a substantially rectangular shape. One main surface (first main surface) of the base plate 71 contacts the other main surface of the flat portion 13 of the bus bar 10. A plurality of heat sinks 72 are provided on the other main surface (second main surface) of the base plate 71.

[0066] Each heat sink 72 is in a rectangular plate shape and is made of the same material as the base plate 71. For example, the heat sink 72 and the base plate 71 are formed integrally. The heat sink 72 is substantially vertically erected from the base plate 71. The heat sink 72 is arranged in parallel at a predetermined interval in the longitudinal direction of the bottom wall 31.

[0067] The upper case 20 is in the shape of a box with one surface open on the side of the lower case 30 . The upper case 20 is slightly smaller in the longitudinal direction and in the width direction perpendicular to the longitudinal direction than the lower case 30 .

[0068] In addition, the upper housing 20 has a top wall 21 opposite to the bottom wall 31 of the lower housing 30 and a side wall 22 (see FIG. Figure 1 ).

[0069] In the upper case 20 , a plurality of through holes 23 (first through holes) are formed in the top wall 21 . More specifically, the plurality of through holes 23 are formed in most of the top wall 21 including the vicinity of the bus bar 10 . The plurality of through holes 23 are formed along the top wall 21 .

[0070] The through holes 23, particularly the through holes 23 provided near the bus bar 10, are formed at positions corresponding to the gaps between the adjacent heat sinks 72 in the relative direction between the top wall 21 and the bottom wall 31 of the lower case 30 (hereinafter referred to as the relative direction) (see Figure 2). In other words, the area directly below each through hole 23 corresponds to the area between adjacent heat sinks 72. In addition, each through hole 23 is substantially in the shape of a long strip extending along the heat sink 72. In particular, the through hole 23 provided near the bus bar 10 extends along the gap between adjacent heat sinks 72.

[0071] Figure 5 yes Figure 2 A cross-sectional view of line VV.

[0072] In addition, a positioning portion 28 for determining the position of the heat dissipation member 70 (heat dissipation fin 72) during assembly is protrudingly provided on the inner side surface of the top wall 21. The positioning portion 28 is provided near the heat dissipation fins 72 at both ends in the parallel arrangement direction of the heat dissipation fins 72. In detail, in the relative direction, the positioning portion 28 is provided at a position corresponding to the gap between the heat dissipation fin 72 at one end and the adjacent heat dissipation fin 72, or at a position corresponding to the gap between the heat dissipation fin 72 at the other end and the adjacent heat dissipation fin 72. Each positioning portion 28 is rectangular in a longitudinal cross-sectional view, and the position of the heat dissipation member 70 is determined by the front end portion contacting the inner side surface of the heat dissipation fin 72 at the end.

[0073] In addition, in the upper case 20, a plurality of side wall through holes 24 (second through holes) are formed on two side walls 22 facing each other in the width direction of the top wall 21, extending over the edge of the top wall 21. That is, a plurality of side wall through holes 24 are formed on the side wall 22 on the side facing the fuse 60 and on the side wall 22 on the other side facing the connection terminal of the relay 40. The side wall through holes 24 are particularly concentrated near the bus bar 10, that is, near the through hole 23. The side wall through holes 24 are formed at regular intervals in the length direction of the upper case 20.

[0074] The side wall through hole 24 of the side wall 22 on one side and the side wall through hole 24 of the side wall 22 on the other side are formed at positions matching each other in the width direction of the top wall 21 (i.e., the relative direction of the side wall 22 on one side and the side wall 22 on the other side). In addition, the side wall through hole 24 of the side wall 22 on one side and the side wall through hole 24 of the side wall 22 on the other side are formed at positions corresponding to the gaps between adjacent heat sinks 72 in the width direction of the top wall 21 (refer to Figure 2 and Figure 5 ).

[0075] Therefore, no heat sink 72 exists between the side wall through-holes 24 of the one side wall 22 and the side wall through-holes 24 of the other side wall 22 corresponding to each other in the width direction of the top wall 21 , and a gap is formed between adjacent heat sink fins 72 .

[0076] The side wall through holes 24 of the one side wall 22 and the side wall through holes 24 of the other side wall 22 are substantially elongated and extend in the opposing direction. In particular, the side wall through holes 24 provided near the bus bar 10 extend along the gaps between adjacent heat sinks 72 .

[0077] Furthermore, each through hole 23 and each side wall through hole 24 of the upper case 20 has a width of, for example, several millimeters, which is too wide for the fingertips of an operator to enter.

[0078] Furthermore, the side wall 22 is provided with engagement portions 25 that engage with the engagement protrusions 35 of the lower housing 30 at multiple locations at the lower end. The engagement portion 25 is in a U-shape, with both ends on the open side fixed to the side wall 22, and the bent portion protruding downward from the side wall 22. When the upper housing 20 and the lower housing 30 are assembled, the engagement protrusion 35 of the lower housing 30 passes from the inner side of the engagement portion 25 between the edge of the side wall 22 and the bent portion of the engagement portion 25, thereby engaging the engagement protrusion 35 with the engagement portion 25 (see FIG. Figure 1 ).

[0079] In the electrical connection box 100, a current in the range of 300A to 1000A is used. When the current flows, heat is generated from the relay 40 and the fuse 60, and the heat of the relay 40 and the fuse 60 is immediately transferred to the bus bar 10 in direct contact. The heat generated from the relay 40 and the fuse 60 may have an adverse effect on the relay 40, the fuse 60, and the electronic components around the bus bar 10, so rapid cooling is required. However, the heat dissipation effect brought about by the heat dissipation of the relay 40 and the fuse 60 itself cannot be expected to be large, and the heat dissipation through the bus bar 10 connected to the relay 40 and the fuse 60 is more efficient.

[0080] In contrast, the electrical connection box 100 of the present embodiment is provided with a heat dissipation member 70 on the bus bar 10. When power is turned on, the heat transferred from the relay 40 and the fuse 60 to the bus bar 10 and the heat generated by the bus bar 10 are quickly transferred to the base plate 71 of the heat dissipation member 70 in direct contact with the bus bar 10 and dissipated to the air via the heat sink 72. Therefore, the heat generated from the relay 40 and the fuse 60 can be effectively dissipated via the bus bar 10, and the heat generated by the bus bar 10 can also be appropriately dissipated, so that the above-mentioned problems can be prevented in advance.

[0081] In addition, a large current (e.g., 1000A) cannot be used for a long time due to safety issues and the problem of generating a large amount of heat in the bus bar 10, and is used intermittently for a short time. Thus, when a large current is used, the time for the large current to flow is short, so that heat is concentrated at the connection portion between the relay 40 and the fuse 60, that is, the two ends 11 and 12 of the bus bar 10, compared with the heat generated in the entire bus bar 10.

[0082] For this reason, in the electrical connection box 100 of the present embodiment, the heat dissipation member 70 (heat dissipation fin 72) is also arranged near the one end 11 and the other end 12 of the bus bar 10. Therefore, as described above, even when a large current flows and heat is concentrated on the two ends 11 and 12 of the bus bar 10, the heat of the bus bar 10, the relay 40 and the fuse 60 can be effectively dissipated.

[0083] In the electrical connection box 100 of the present embodiment, as described above, the through hole 23 and the side wall through hole 24 are formed near the bus bar 10 in the upper case 20. Therefore, air easily flows from the outside into the bus bar 10 and the heat dissipation member 70, and the air cooling effect can be improved.

[0084] Furthermore, in the electrical junction box 100 of the present embodiment, as described above, the through holes 23 of the upper case 20 are formed at positions corresponding to the gaps between the adjacent heat sinks 72 in the relative direction of the top wall 21 and the bottom wall 31. In addition, the side wall through holes 24 of the upper case 20 are formed at positions corresponding to the gaps between the adjacent heat sinks 72 in the width direction of the top wall 21. Therefore, the inflow of the outside air into the spaces between the adjacent heat sinks 72 and the outflow of the inside air from the spaces between the adjacent heat sinks 72 are not stagnant and can be performed rapidly.

[0085] Moreover, as described above, the side wall through holes 24 of the side wall 22 on one side and the side wall through holes 24 of the side wall 22 on the other side are formed at mutually matching positions in the width direction of the top wall 21, and a gap between adjacent heat sinks 72 is formed between the side wall through holes 24 of the side wall 22 on one side and the side wall through holes 24 of the side wall 22 on the other side.

[0086] Therefore, for example, the air flowing in from the side wall through hole 24 of the side wall 22 on one side (the side wall through hole 24 of the side wall 22 on the other side) passes between the adjacent heat sinks 72 and flows out quickly from the side wall through hole 24 of the side wall 22 on the other side (the side wall through hole 24 of the side wall 22 on one side). At this time, the air containing the heat convected from the heat sink 72 flows toward the outside of the housing 50 together, so that the cooling effect of the relay 40, the fuse 60 and the bus bar 10 can be further improved.

[0087] Furthermore, as described above, the through hole 23 provided near the bus bar 10 is formed at a position corresponding to the gap between the adjacent heat sinks 72 in the relative direction between the top wall 21 and the bottom wall 31 of the lower case 30. Therefore, the air containing the heat convected from the heat sink 72 quickly flows out to the outside of the housing 50 through the through hole 23 directly above when rising between the adjacent heat sinks 72. Therefore, the cooling effect of the relay 40, the fuse 60 and the bus bar 10 can be further improved.

[0088] (Implementation method 2)

[0089] Figure 6 FIG. 1 is a partial top view of the electrical junction box 100 according to the second embodiment. Figure 6 In FIG. 1 , for convenience, the vicinity of the bus bar 10 is shown in an enlarged manner, and the positions of the bus bar 10 and the heat dissipation member 70 are indicated by dotted lines.

[0090] The electrical connection box 100 of the second embodiment is similar to the first embodiment, wherein a plurality of through holes 23 (first through holes) are formed in the top wall 21 of the upper case 20 near the bus bar 10 , and a plurality of side wall through holes 24 (second through holes) are formed in the side wall 22 near the bus bar 10 .

[0091] The through holes 23 provided near the bus bar 10 are formed at positions corresponding to the gaps between adjacent heat sinks 72 in the relative direction between the top wall 21 and the bottom wall 31, similarly to the first embodiment. That is, the area directly below each through hole 23 corresponds to the area between adjacent heat sinks 72. Each through hole 23 extends along the heat sink 72 and is substantially in the shape of a long strip.

[0092] In the electrical connection box 100 of the second embodiment, the through holes 23A formed near the one end 11 and the other end 12 of the bus bar 10 among the plurality of through holes 23 are formed larger than the other through holes 23. For example, the through hole 23A has a larger dimension in the arrangement direction of the plurality of through holes 23 than the other through holes 23.

[0093] In addition, the side wall through-hole 24 is the same as that in the first embodiment, and the detailed description thereof is omitted.

[0094] As described above, in the electrical connection box 100 of the second embodiment, the through holes 23A formed near the one end 11 and the other end 12 of the bus bar 10 among the plurality of through holes 23 are larger than the other through holes 23. Therefore, the amount of air flowing in from the through holes 23A becomes relatively large, thereby enabling the one end 11 and the other end 12 to be cooled more intensively, and it is possible to cope with a situation where a large current flows and heat is concentrated at the two ends 11 and 12 of the bus bar 10.

[0095] The same parts as those in Implementation 1 are denoted by the same reference numerals and detailed descriptions thereof are omitted.

[0096] (Implementation method 3)

[0097] Figure 7 FIG. 1 is a partial longitudinal sectional view of an electrical junction box 100 according to Embodiment 3. Figure 7 In FIG. 1 , for convenience, the vicinity of the heat dissipation member 70 is shown in an enlarged manner, and the position of the other end portion 12 is shown by a single-dot chain line.

[0098] The electrical connection box 100 of the third embodiment is similar to the first embodiment, wherein a plurality of through holes 23 (first through holes) are formed near the bus bar 10 in the top wall 21 of the upper case 20 , and a plurality of side wall through holes 24 (second through holes) are formed near the bus bar 10 in the side wall 22 .

[0099] In the upper case 20, as in the first embodiment, a plurality of side wall through holes 24 (second through holes) are formed in the side wall 22 on one side and the side wall 22 on the other side that are opposite to each other in the width direction of the top wall 21. The side wall through holes 24 are formed particularly concentrated near the bus bar 10, that is, near the through hole 23.

[0100] The side wall through hole 24 of the side wall 22 on one side and the side wall through hole 24 of the side wall 22 on the other side are formed at positions matching each other in the width direction of the top wall 21, and the side wall through hole 24 of the side wall 22 on one side and the side wall through hole 24 of the side wall 22 on the other side are formed at positions corresponding to the gaps between adjacent heat sinks 72 in the width direction of the top wall 21 (refer to Figure 2 and Figure 7 ). Each side wall through hole 24 extends along the gap between adjacent heat sinks 72 and has a substantially long strip shape.

[0101] In the electrical connection box 100 of the third embodiment, Figure 7 As shown, among the plurality of side wall through holes 24, the side wall through holes 24A formed near the one end 11 and the other end 12 of the bus bar 10 are formed larger than the other side wall through holes 24. Figure 7 In the figure, only the side wall 22 on the other side is shown, but in either the side wall through hole 24 of the side wall 22 on one side or the side wall through hole 24 of the side wall 22 on the other side, a side wall through hole 24A larger than the side wall through hole 24 on the other side is formed near the two end portions 11 and 12.

[0102] For example, the size of the side wall through-hole 24A in the arrangement direction of the plurality of side wall through-holes 24 is larger than that of other side wall through-holes 24 , or the ratio of the side wall through-hole to the gap between adjacent heat sinks 72 is larger than that of other side wall through-holes 24 .

[0103] In addition, the through hole 23 is the same as that in the first embodiment, and the detailed description thereof is omitted.

[0104] As described above, in the electrical connection box 100 of the third embodiment, the side wall through holes 24A formed near the one end 11 and the other end 12 of the bus bar 10 among the plurality of side wall through holes 24 are larger than the other side wall through holes 24. Therefore, the amount of air flowing in from the side wall through holes 24A becomes relatively large, thereby enabling the one end 11 and the other end 12 to be cooled more intensively, and it is possible to cope with a situation where a large current flows and heat is concentrated at the two ends 11 and 12 of the bus bar 10.

[0105] The same parts as those in Implementation 1 are denoted by the same reference numerals and detailed descriptions thereof are omitted.

[0106] (Implementation method 4)

[0107] Figure 8 FIG. 1 is a top view of the electrical junction box 100 according to the fourth embodiment in a state where the upper case 20 is removed. Figure 8 In FIG. 1 , the vicinity of the heat dissipation member 70 is shown enlarged for convenience.

[0108] The electrical connection box 100 of the fourth embodiment is similar to the first embodiment, and includes a bus bar 10, a flat portion 13 of the bus bar 10 being arranged opposite to the bottom wall 31, and a heat dissipation member 70 for dissipating heat generated by the bus bar 10 when power is supplied is mounted on the flat portion 13. The heat dissipation member 70 is in a comb shape in a longitudinal cross-sectional view extending along the longitudinal direction of the lower case 30, and includes a base plate 71 and a plurality of heat dissipation fins 72 (heat dissipation plates).

[0109] The base plate 71 is made of a material having good thermal conductivity such as aluminum and has a rectangular shape. One main surface of the base plate 71 contacts the other main surface of the flat portion 13 of the bus bar 10 , and a plurality of heat sinks 72 are provided on the other main surface.

[0110] Each heat sink 72 is in a rectangular plate shape and is made of the same material as the base plate 71. For example, the heat sink 72 and the base plate 71 are formed integrally. The heat sink 72 is erected substantially vertically from the base plate 71. The heat sink 72 is arranged in parallel in the longitudinal direction of the base plate 71.

[0111] In the electrical connection box 100 of the fourth embodiment, a bus bar 10 is configured to have a plurality of electrical connections formed therein near the one end portion 11 and the other end portion 12 (see Figure 8 In the portion indicated by the dotted circle, the number of the heat sink 72 is greater than that in other portions. That is, the heat sink 72 is concentratedly arranged near the one end 11 and the other end 12 of the bus bar 10.

[0112] Thus, in the electrical connection box 100 of the fourth embodiment, more heat sinks 72 are arranged near the one end 11 and the other end 12 of the bus bar 10 than in other parts. As the number of heat sinks 72 increases, the surface area that can dissipate heat increases, so that the heat dissipation capability can be improved near the two end portions 11 and 12. Therefore, the two end portions 11 and 12 can be cooled more intensively, and it is possible to cope with a situation where a large current flows and heat is concentrated at the two end portions 11 and 12 of the bus bar 10.

[0113] The same parts as those in Implementation 1 are denoted by the same reference numerals and detailed descriptions thereof are omitted.

[0114] The technical features (constituent elements) described in Embodiments 1 to 4 can be combined with each other, and new technical features can be formed by the combination.

[0115] The embodiments disclosed this time should be considered as illustrative in all aspects and not restrictive. The scope of the present invention is indicated by the claims rather than the above meaning, and is intended to include all modifications within the meaning and scope equivalent to the claims.

[0116] The matters described in each embodiment can be combined with each other. In addition, the independent claims and dependent claims described in the claims can be combined with each other in all combinations regardless of the reference form. Moreover, the form of recording a claim that references two or more other claims (multiple dependent claim form) is adopted in the claims, but it is not limited to this. It can also be recorded in the form of recording multiple dependent claims that reference at least one multiple dependent claim (multiple-reference-multiple claim).

[0117] Description of Reference Numerals

[0118] 10 Busbar

[0119] 11 One end

[0120] 12 The other end

[0121] 13 Flat part

[0122] 20 Upper shell

[0123] 21 Top wall

[0124] 22 Sidewall

[0125] 23 Through hole

[0126] 24, 24A Side wall through hole

[0127] 25 snap-fit ​​part

[0128] 28 Positioning unit

[0129] 30 Lower housing

[0130] 31 bottom wall

[0131] 33 Sidewall

[0132] 35 Engagement protrusion

[0133] 37 Fixing holes

[0134] 40 Relay

[0135] 50 Shell

[0136] 60 Fuse

[0137] 61 Connection terminal

[0138] 70 heat dissipation components

[0139] 71 base plate

[0140] 72 Heat sink

[0141] 100 Electrical connection box

[0142] 200 Battery Pack

Claims

1. An electrical connection box, comprising: a housing having a fixed wall fixed to an object and provided with an electronic component; and a plate-shaped bus bar arranged opposite to the fixed wall and connected to the electronic component, wherein: The electrical connection box includes a plurality of heat dissipation plates that are erected in a direction intersecting the bus bar and dissipate heat from the bus bar.

2. The electrical connection box according to claim 1, wherein: The electrical connection box includes a base plate, a first main surface of the base plate being in contact with one main surface of the bus bar. The plurality of heat dissipation plates are disposed on the second main surface of the base plate.

3. The electrical connection box according to claim 2, wherein: A first through hole is formed in the opposite wall to the fixed wall, The first through hole is formed at a position corresponding to a gap between adjacent heat dissipation plates in the opposing direction between the fixing wall and the opposing wall.

4. The electrical connection box according to claim 3, wherein: The first through hole extends along the heat dissipation plate.

5. The electrical connection box according to claim 3 or 4, wherein: Side walls extending toward the fixed wall are continuously arranged at two opposite edges of the opposite wall. A second through hole is formed in each side wall, The second through holes are respectively formed at positions corresponding to gaps between adjacent heat dissipation plates in the opposing direction of the two side walls.

6. The electrical connection box according to claim 5, wherein: The second through hole extends along the heat dissipation plate.

7. The electrical connection box according to claim 3, wherein: The base plate and the plurality of heat dissipation plates are formed integrally, The opposing wall is provided with a positioning portion for fixing the position of the heat sink.

8. The electrical connection box according to claim 1 or 2, wherein: The heat sink is provided near a connection portion between the bus bar and the electronic component.

9. The electrical connection box according to claim 8, wherein: The number of the heat sinks is greater near the connection portion than in other portions.

10. The electrical connection box according to claim 3, wherein: There are a plurality of first through holes, Among the plurality of first through holes, one first through hole formed near a connection portion between the bus bar and the electronic component is larger than the other first through holes.

11. The electrical connection box according to claim 5, wherein: There are a plurality of second through holes, Among the plurality of second through holes, one second through hole formed near a connection portion between the bus bar and the electronic component is larger than the other second through holes.

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