Electrical junction box

Abstract

This electrical connection box (100) is provided with a housing that houses a plurality of bus bars (10) and dissipates heat from the bus bars (10) to the outside via the housing, and is provided with: a first heat dissipation unit (70) that dissipates heat by radiation from the bus bars (10) at an interval that is equal to or less than a first interval, and a second heat dissipation unit (70) that dissipates heat by radiation from the bus bars (10) at an interval that is equal to or less than a second interval; and a second heat dissipation part (60) which is separated from the bus bar (10) by a second interval or more and which dissipates heat by convection.

Description

Technical Field

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

[0002] This application claims the priority based on Japanese application No. 2022-146344 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] The electrical connection box involved in the embodiment of the present disclosure includes a shell that accommodates a plurality of bus bars, and dissipates heat from the bus bars to the outside via the shell. The electrical connection box includes: a first heat dissipation portion that is separated from the bus bars by an interval less than a first interval and performs heat dissipation based on radiation; and a second heat dissipation portion that is separated from the bus bars by an interval greater than a second interval and performs heat dissipation based on convection. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0011] Figure 3 It is a bottom view of the electrical junction box according to the present embodiment.

[0012] Figure 4 It is a plan view showing a state in which the upper case is removed in the electrical junction box of the present embodiment.

[0013] Figure 5 This is a perspective view showing a state in which an upper case is removed in the electrical junction box of the present embodiment.

[0014] Figure 6 yes Figure 2 A longitudinal cross-sectional view taken along line VI-VI.

[0015] Figure 7 yes Figure 2 A longitudinal cross-sectional view along line VII-VII. DETAILED DESCRIPTION

[0016] [Problems to be Solved by the Invention]

[0017] 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.

[0018] 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 dissipated efficiently.

[0019] 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.

[0020] [Effects of the present disclosure]

[0021] According to the present disclosure, it is possible to provide an electrical junction box capable of more effectively dissipating heat of electronic components generated when power is supplied.

[0022] [Description of Embodiments of the Invention]

[0023] 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.

[0024] (1) An electrical connection box according to an embodiment of the present disclosure includes a housing that accommodates a plurality of bus bars, and dissipates heat from the bus bars to the outside via the housing, wherein the electrical connection box includes: a first heat dissipation portion that is disposed at a position that is spaced apart from the bus bars by an interval that is less than a first interval, and performs heat dissipation based on radiation; and a second heat dissipation portion that is spaced apart from the bus bars by an interval that is greater than a second interval, and performs heat dissipation based on convection.

[0025] In this embodiment, a first heat dissipation portion for heat dissipation by radiation and a second heat dissipation portion for heat dissipation by convection are provided. By appropriately combining the first heat dissipation portion and the second heat dissipation portion to dissipate heat, the heat of the electronic components can be dissipated more effectively via the bus bar.

[0026] (2) In the electrical connection box of the embodiment of the present disclosure, the emissivity of the housing is greater than the emissivity of the bus bar.

[0027] In this embodiment, the emissivity of the housing is greater than that of the bus bar. Therefore, the heat from the bus bar is dissipated to the outside through the housing using the first and second heat dissipating portions, thereby effectively dissipating the heat of the electronic components.

[0028] (3) In the electrical connection box of the embodiment of the present disclosure, one surface of the first heat dissipation portion faces the bus bar, and the other surface of the first heat dissipation portion is exposed to the outside air.

[0029] In the present embodiment, one surface of the first heat dissipation portion faces the bus bar, and the other surface is open to the outside air, so that the effect of heat dissipation by radiation can be enhanced.

[0030] (4) In the electrical junction box according to the embodiment of the present disclosure, the second heat dissipation portion has a through hole.

[0031] In the present embodiment, the second heat dissipation portion has a through hole, so that air can flow in and out of the housing through the through hole, thereby improving the effect of heat dissipation by convection.

[0032] (5) In the electrical connection box according to the embodiment of the present disclosure, a fixing member protrudes at a position facing the through hole, and the fixing member fixes the bus bar to another member.

[0033] In this embodiment, a fixing member for fixing the bus bar to another member protrudes from the second heat dissipating portion at a position opposite to the through hole, thereby creating a gap with the wall of the housing, facilitating air flow and enabling effective heat dissipation by the second heat dissipating portion.

[0034] (6) The electrical connection box of the embodiment of the present disclosure includes a fixed wall fixed to an object, and the plurality of bus bars include a bus bar having a main surface opposite to a side wall intersecting the fixed wall and extending along the side wall, the side wall having the second heat dissipation portion at a position opposite to an end of the bus bar from which the fixing component protrudes, and having the first heat dissipation portion at a position opposite to a portion of the bus bar other than the end.

[0035] In this embodiment, the second heat dissipation portion performs convection heat dissipation on the end of the one bus bar from which the fixing member protrudes, and the first heat dissipation portion performs radiation heat dissipation on the other portion of the one bus bar except the end. In this way, by appropriately combining the first heat dissipation portion and the second heat dissipation portion to dissipate heat from the one bus bar, the heat of the electronic component can be dissipated more effectively.

[0036] (7) In the electrical junction box according to the embodiment of the present disclosure, the first heat dissipation portion is provided on the other main surface side of the other portion.

[0037] In this embodiment, the first heat dissipation portions are provided on both main surface sides of the other portion of the one bus bar to perform heat dissipation by radiation. Therefore, the heat dissipation effect by the first heat dissipation portions can be further improved.

[0038] (8) In the electrical connection box of the embodiment of the present disclosure, the plurality of bus bars include other bus bars, the other bus bars include a flat portion having an opposing surface opposite to the fixed wall, the fixed wall has the first heat dissipation portion at a relative position opposite to the opposing surface of the flat portion, the fixing component protrudes from an opposite surface of the flat portion opposite to the opposing surface, and the second heat dissipation portion is provided on the opposite surface side.

[0039] In this embodiment, the first heat dissipation portion performs heat dissipation based on radiation to the opposite surface of the flat portion of the other bus bar, and the second heat dissipation portion performs heat dissipation based on convection to the opposite surface of the flat portion. In this way, by appropriately combining the first heat dissipation portion and the second heat dissipation portion to dissipate heat to the other bus bar, the heat of the electronic component can be dissipated more effectively.

[0040] (9) In the electrical junction box according to the embodiment of the present disclosure, the first interval is smaller than the second interval.

[0041] In this embodiment, when the interval between the first heat dissipation portion and the bus bar is less than the first interval, the first heat dissipation portion performs heat dissipation based on radiation, and when the interval between the first heat dissipation portion and the bus bar is wider than the first interval, that is, greater than the second interval, the second heat dissipation portion performs heat dissipation based on convection, thereby being able to more effectively dissipate heat from electronic components.

[0042] [Details of the embodiments of the present invention]

[0043] 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.

[0044] Figure 1 is a perspective view of an electrical junction box 100 according to this embodiment. Figure 2 is a top view of the electrical junction box 100 of this embodiment. Figure 3 FIG. 1 is a bottom view of the electrical junction box 100 according to the present embodiment. Figure 2 and Figure 3 In FIG. 1 , the position of a bus bar 10 described later is indicated by a dotted line.

[0045] The electrical connection box 100 is mounted on the outside of a mounting target such as a battery pack 500 of an EV (Electric Vehicle). Figure 1 , for convenience, the state in which the electrical connection box 100 is installed on the battery pack 500 is shown.

[0046] The electrical connection box 100 includes, for example, a housing 50 that accommodates at least one relay 40A, a substrate, etc. The housing 50 is substantially rectangular in plan view and is made of, for example, a material (eg, resin) having a higher emissivity than the bus bar 10 described later.

[0047] The housing 50 includes a lower case 30 mounted on the mounting object and an upper case 20 partially covering the lower case 30. Electronic components such as the relay 40A and the bus bar 10 are mounted on the lower case 30, and the upper case 20 covers a part of these electronic components.

[0048] 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.

[0049] Figure 4 1 is a plan view showing a state in which the upper case 20 is removed in the electrical junction box 100 of the present embodiment. Figure 5 It is a perspective view showing a state in which the upper case 20 is removed in the electrical junction box 100 of the present embodiment.

[0050] The lower housing 30 is in the shape of a flat box with one side open on the upper housing 20 side. The lower housing 30 has a substantially rectangular bottom wall 31 (fixed wall) whose outer side contacts and is fixed to the installation object, and a side wall 33 is provided on the edge of the bottom wall 31 to extend vertically toward the upper housing 20 side. The bottom wall 31 has steps formed on both ends, and the two ends are arranged at a position higher than the middle part. Accordingly, the height dimension of the side wall 33 becomes shorter at the ends of the bottom wall 31. In addition, a grid-shaped rib 311 is formed on the outer side surface of the bottom wall 31. As described above, the relay 40A and the bus bar 10 are provided on the inner side of the lower housing 30.

[0051] 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.

[0052] In addition, fixing holes 37 used when attaching the lower case 30 (housing 50) to the attachment object are formed in the bottom wall 31 at four corners and near one side wall 33. In addition, notches are formed in the side wall 33 near the fixing holes 37.

[0053] like Figure 4~Figure 5 As shown, for example, one relay 40A is provided in the lower case 30. The relay 40A is provided with two connection terminals (not shown) toward the side wall 33 of one long side in the width direction of the lower case 30.

[0054] The lower case 30 is provided with a plurality of bus bars 10. The plurality of bus bars 10 include a bus bar 10A (one bus bar) and a bus bar 10B connected to the connection terminal of the relay 40A, a bus bar 10C (another bus bar) provided at one end of the lower case 30, and a bus bar 10D and a bus bar 10E provided at the other end of the lower case 30. The bus bars 10A, 10B, 10C, 10D, and 10E are made of a material (e.g., copper) having a lower emissivity than the lower case 30 (housing 50).

[0055] The bus bar 10A and the bus bar 10B are disposed near the side wall 33 on the one long side of the lower case 30. The bus bar 10A and the bus bar 10B are disposed so that one main surface of each of the bus bars 10A and 10B faces the side wall 33 on the one long side. That is, the bus bar 10A and the bus bar 10B are vertically erected relative to the bottom wall 31.

[0056] The busbar 10A is in the shape of a rectangular plate and extends along the side wall 33 of the one long side. The busbar 10A has a step formed near one end 101A in the longitudinal direction, and is crank-shaped in a top view. The busbar 10A is arranged in a manner that the other portion 102A other than the one end 101A is closer to the side wall 33 of the one long side than the one end 101A. The one end 101A of the busbar 10A is threadedly fastened to the connection terminal (other component) at the other end of the lower housing 30 of the two connection terminals of the relay 40A by a screw 200 (fixing component). The screw 200 protrudes from a side of the busbar 10A (one end 101A) opposite to the side wall 33 of the one long side.

[0057] The bus bar 10B has a rectangular plate shape and extends along the side wall 33 on the one long side. One end of the bus bar 10B is screwed by a screw 200 to the connection terminal on the lower case 30 of the two connection terminals of the relay 40A.

[0058] Figure 6 yes Figure 2 A longitudinal cross-sectional view taken along line VI-VI. Figure 6 The structure of one end portion of the lower case 30 is shown.

[0059] The bus bar 10C is provided at one end of the lower case 30. The bus bar 10C is made of a plate material and has a flat portion 101C disposed opposite to the bottom wall 31, and one edge of the flat portion 101C is bent toward the bottom wall 31. That is, the flat portion 101C has an opposing surface 103C opposite to the bottom wall 31. The flat portion 101C is cut out in the vertical direction to correspond to the fixing hole 37.

[0060] The bus bar 10C is screwed and fastened to the bottom wall 31 by screws 200 via the interposing member 312. At this time, the gap between the opposing surface 103C and the bottom wall 31 is 1 mm or less. In addition, in the center of the flat portion 101C, the screw 200 protrudes from the opposing surface 102C on the side opposite to the opposing surface 103C. The opposing surface 102C and the top wall 21B (see FIG. 20 ) of the upper case 20 described later are connected. Figure 1 and Figure 2 )relatively.

[0061] The bus bar 10D and the bus bar 10E are provided at the other end of the lower case 30. The bus bar 10D is in a rectangular plate shape, and the bus bar 10E is in a plate shape. The bus bar 10D and the bus bar 10E are arranged opposite to the bottom wall 31. The bus bar 10D and the bus bar 10E partially overlap in the vertical direction, and the bus bar 10E is provided below the bus bar 10D, that is, on the side of the bottom wall 31. The bus bar 10E is cut out in the vertical direction to correspond to the fixing hole 37.

[0062] The busbar 10D and the busbar 10E are screwed to the bottom wall 31 by screws 200, and the screws 200 protrude from the upper surface of the busbar 10D. At this time, the interval from the lower surface of the busbar 10D and the busbar 10E to the bottom wall 31 is less than 1 mm. The upper surface of the busbar 10D is exposed to the outside air, and the upper surface of the busbar 10E is partially exposed (see Figure 1 and Figure 2 ).

[0063] The upper case 20 is in the shape of a box with one side of the lower case 30 open. The upper case 20 partially covers the lower case 30, and as described above, the bus bar 10D, the bus bar 10E, etc. at the other end of the lower case 30 are exposed to the outside (see Figure 1 and Figure 2 ).

[0064] The upper housing 20 has a top wall 21 opposite to the bottom wall 31, and a side wall 22 is vertically extended toward the lower housing 30 at the edge of the top wall 21. A step is formed on the top wall 21. That is, in the top wall 21, with respect to the portion corresponding to the relay 40A, that is, the portion covering the relay 40A (hereinafter referred to as the top wall 21A), steps are formed on one end side portion (hereinafter referred to as the top wall 21B) and the other end side portion (hereinafter referred to as the top wall 21C) in the longitudinal direction of the lower housing 30. Therefore, the top wall 21B and the top wall 21C are arranged at a position lower than the top wall 21A.

[0065] The side wall 22 extends along the length direction of the lower case 30. As described above, since the top wall 21A and the top wall 21B are located at different positions in the vertical direction, the height dimension of the side wall 22 varies depending on the position. In addition, the width of the upper case 20 is slightly smaller than the width of the lower case 30. The side wall 22 is opposite to the side wall 33 of the lower case 30 and abuts against the inner side surface of the side wall 33 (see Figure 7 ). At this time, the side wall 22 is interposed between the bus bar 10A and the bus bar 10B and the side wall 33 of the lower case 30 .

[0066] A plurality of through holes are formed in the top wall 21A, and the relay 40A is partially exposed through the through holes. In addition, a plurality of side wall through holes 24 are formed in the side wall 22 of the top wall 21A. The plurality of side wall through holes 24 are formed at predetermined intervals in the longitudinal direction of the lower housing 30. Each side wall through hole 24 extends in the up-down direction and is formed from the upper end of the side wall 22 to the edge of the top wall 21A. In addition, the side wall through hole 24 has a width of, for example, several mm, which is not accessible to the fingertips of the operator.

[0067] More specifically, the side wall through hole 24 is formed at a position opposite to the connection portion, which is the connection portion between the bus bar 10B and the bus bar 10A and the relay 40A. That is, the screw 200 for fixing the bus bar 10B and the bus bar 10A to the connection terminal of the relay 40A protrudes from the bus bar 10B and the bus bar 10A at a position opposite to the side wall through hole 24 (see Figure 4 ). At this time, the interval from the connection portion of the bus bar 10B and the bus bar 10A to the side wall 22 is 5 mm.

[0068] A plurality of top wall through holes 23 are formed in the top wall 21B, and the bus bar 10C is partially exposed through the top wall through holes 23. Specifically, a plurality of rows of top wall through holes 23 formed in the longitudinal direction of the lower case 30 are formed in the width direction of the lower case 30. In addition, the center portion of the top wall 21B protrudes upward (see FIG. Figure 1 and Figure 2 ). In addition, the top wall through hole 23 has a width such as several mm that the fingertips of the operator cannot enter.

[0069] In addition, the top wall 21B faces the flat portion 101C of the bus bar 10C. As described above, the screw 200 for fixing the bus bar 10C to the bottom wall 31 protrudes from the opposite surface 102C of the flat portion 101C, and the top wall through hole 23 of the top wall 21B faces the screw 200. At this time, the interval from the opposite surface 102C of the bus bar 10C to the top wall 21B is 5 mm.

[0070] The top wall 21C has a flat portion and a protruding portion 211C that is provided near the side wall 22 and stands vertically.

[0071] Figure 7 yes Figure 2 A longitudinal cross-sectional view along line VII-VII.

[0072] The protrusion 211C is disposed near the side wall 22, in other words, near the bus bar 10A. The protrusion 211C has a cover portion 213C that covers the other main surface of the other portion 102A of the bus bar 10A.

[0073] The cover portion 213C is provided with the flat portion of the top wall 21C continuously on a surface opposite to the other main surface of the other portion 102A.

[0074] The cover 213C is a generally rectangular shape extending along the length direction of the lower housing 30, and is in an inverted L-shape when viewed in longitudinal section. That is, most of the cover 213C is a flat plate portion facing the other main surface of the bus bar 10A (other portion 102A), and the upper edge of the flat plate portion is bent toward the bus bar 10A. The side wall 22 is continuously provided at the upper edge of the cover 213C. The upper end of the cover 213C is located at the same position as the upper surface of the top wall 21A in the vertical direction. Hereinafter, for convenience, the flat plate portion of the cover 213C is also referred to as the cover 213C.

[0075] The cover 213C faces the bus bar 10A (other portion 102A) and the side wall 22 at a predetermined interval. The bus bar 10A (other portion 102A) is interposed between the cover 213C and the side wall 22. That is, the side wall 22 faces one main surface of the bus bar 10A (other portion 102A), and the cover 213C faces the other main surface of the bus bar 10A (other portion 102A).

[0076] In addition, if Figure 7 As shown, the outer side surface of the lower end portion of the side wall 22 contacts the inner side surface of the side wall 33 of the lower case 30. As described above, the side wall 33 of the lower case 30 also faces one main surface of the bus bar 10A (other portion 102A).

[0077] The interval from the side wall 22 to the bus bar 10A, the interval from the cover portion 213C to the bus bar 10A, and the interval from the side wall 33 of the lower case 30 to the bus bar 10A are all 1 mm or less.

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

[0079] In the electrical connection box 100, when power is turned on, heat is generated from the relay 40A and the like, and the heat of the relay 40A is immediately transferred to the bus bar 10 in direct contact. The heat generated from the relay 40A may also have an adverse effect on the electronic components around the relay 40A and the bus bar 10, so it is necessary to cool them quickly. However, the heat dissipation effect based on the heat dissipation of the relay 40A itself cannot be expected to be large, and the heat dissipation via the bus bar 10 connected to the relay 40A is more efficient.

[0080] The electrical junction box 100 of the present embodiment includes a first heat sink 70 and a second heat sink 60 having different heat dissipation mechanisms, and the heat dissipation mechanisms of the first heat sink 70 and the second heat sink 60 are appropriately combined to efficiently dissipate heat generated from the relay 40A via the bus bar 10 .

[0081] The first heat dissipation portion 70 and the second heat dissipation portion 60 are arranged near the bus bar 10. The first heat dissipation portion 70 is spaced from the bus bar 10 by a first interval or less, and performs heat dissipation based on radiation, and the second heat dissipation portion 60 is spaced from the bus bar 10 by a second interval or more, and performs heat dissipation based on convection. The first interval is smaller than the second interval. For example, the first interval is 1 mm, and the second interval is 5 mm.

[0082] In the electrical connection box 100 of the present embodiment, the bus bar 10A is subjected to heat dissipation by radiation of the first heat dissipation portion 70 (hereinafter referred to as radiation heat dissipation) and heat dissipation by convection of the second heat dissipation portion 60 (hereinafter referred to as convection heat dissipation). Specifically, convection heat dissipation of the second heat dissipation portion 60 is performed on one end portion 101A of the bus bar 10A, and radiation convection of the first heat dissipation portion 70 is performed on the other portion 102A.

[0083] The portion of the side wall 22 of the upper case 20 that is opposite to the one end 101A of the bus bar 10A corresponds to the second heat dissipation portion 60. As described above, the portion corresponding to the second heat dissipation portion 60 is opposite to the connection portion between the bus bar 10A and the relay 40A, and the screw 200 protrudes from the connection portion, so that the portion corresponding to the second heat dissipation portion 60 is separated from the one end 101A of the bus bar 10A by about 5 mm larger than the first interval. In addition, the portion corresponding to the second heat dissipation portion 60 has a plurality of side wall through holes 24.

[0084] Therefore, the outside air can flow into the housing 50 through the side wall through-hole 24 and flow out of the housing 50. Moreover, the portion corresponding to the second heat dissipating portion 60 is separated from the one end portion 101A of the bus bar 10A by about 5 mm, so the outside air that flows in can flow easily. Thus, convection is generated by the flow of the outside air, thereby cooling the heat generated at the connection portion of the bus bar 10A due to the connection resistance. In addition, it is also possible to prevent the fingertips of the operator from contacting the bus bar 10A.

[0085] The portion of the side wall 22 of the upper case 20 that faces the other portion 102A of the bus bar 10A and the cover 213C correspond to the first heat dissipation portion 70. Hereinafter, for convenience, the portion of the side wall 22 of the upper case 20 that faces the other portion 102A of the bus bar 10A and the cover 213C are referred to as the portion corresponding to the first heat dissipation portion 70.

[0086] As described above, the inner side surface of the portion corresponding to the first heat dissipation portion 70 faces the other portion 102A of the bus bar 10A, and the outer side surface thereof is exposed to the outside air. In addition, the portion corresponding to the first heat dissipation portion 70 is separated from the other portion 102A of the bus bar 10A by about 1 mm.

[0087] In this way, since the interval between the portion corresponding to the first heat dissipation portion 70 and the other portion 102A of the bus bar 10A is narrow, the air flow is poor, but heat radiation, i.e., heat radiation, is easily generated, and heat dissipation based on radiation is effectively and preferentially performed. Therefore, the heat generated in the other portion 102A of the bus bar 10A is transferred to the portion corresponding to the first heat dissipation portion 70 by radiation, and is cooled via the outer side surface of the portion corresponding to the first heat dissipation portion 70.

[0088] In the electrical junction box 100 of the present embodiment, the bus bar 10B is subjected to convection heat dissipation by the second heat dissipating portion 60 .

[0089] The portion of the side wall 22 of the upper case 20 facing the connection between the bus bar 10B and the relay 40A corresponds to the second heat sink 60. Hereinafter, for convenience, the portion of the side wall 22 of the upper case 20 facing the connection between the bus bar 10B and the relay 40A is referred to as the portion corresponding to the second heat sink 60.

[0090] As described above, the portion corresponding to the second heat dissipating portion 60 faces the connection portion of the bus bar 10B, and the screw 200 protrudes from the connection portion, so the portion corresponding to the second heat dissipating portion 60 is separated from the bus bar 10B by about 5 mm. The portion corresponding to the second heat dissipating portion 60 has a plurality of side wall through holes 24 .

[0091] Therefore, the outside air can flow into the housing 50 through the side wall through-holes 24 and flow out of the housing 50, and the outside air that flows in can flow easily, and convection is generated by the flow of the outside air, thereby cooling the heat generated at the connection portion of the bus bar 10B due to the connection resistance. In addition, it is also possible to prevent the fingertips of the operator from contacting the bus bar 10B.

[0092] In the electrical junction box 100 of the present embodiment, the bus bar 10C is subjected to radiation heat dissipation of the first heat dissipation portion 70 and convection heat dissipation of the second heat dissipation portion 60. Specifically, the second heat dissipation portion 60 is subjected to convection heat dissipation on the opposite surface 102C of the bus bar 10C, and radiation convection heat dissipation of the first heat dissipation portion 70 is subjected to radiation convection on the opposite surface 103C.

[0093] The top wall 21B corresponds to the second heat dissipation portion 60. As described above, the second heat dissipation portion 60 (top wall 21B) is opposite to the opposite surface 102C of the bus bar 10C, and the screw 200 protrudes from the opposite surface 102C, so that the second heat dissipation portion 60 and the opposite surface 102C of the bus bar 10C are separated by about 5 mm. In addition, the second heat dissipation portion 60 has a plurality of top wall through holes 23.

[0094] Therefore, outside air can flow into the housing 50 through the top wall through-hole 23 and out of the housing 50, and the outside air that flows in can easily flow, and as described above, heat generated in the bus bar 10C can be cooled by convection. In addition, the fingertips of the operator can be prevented from contacting the bus bar 10C.

[0095] The portion of the bottom wall 31 facing the facing surface 103C of the bus bar 10C corresponds to the first heat dissipation portion 70. Hereinafter, for convenience, the portion of the bottom wall 31 facing the facing surface 103C of the bus bar 10C is referred to as a portion corresponding to the first heat dissipation portion 70.

[0096] As described above, the inner side surface of the portion corresponding to the first heat dissipation part 70 faces the facing surface 103C of the bus bar 10C, and the outer side surface thereof is exposed to the outside air. In addition, the portion corresponding to the first heat dissipation part 70 is separated from the bus bar 10C by about 1 mm.

[0097] Thus, since the interval between the portion corresponding to the first heat dissipation part 70 and the bus bar 10C is narrow, heat radiation is easily generated, and heat dissipation based on radiation is performed preferentially. Therefore, the heat generated in the bus bar 10C is transferred from the opposite surface 103C to the portion corresponding to the first heat dissipation part 70 by radiation, and is cooled via the outer side surface of the portion corresponding to the first heat dissipation part 70.

[0098] Furthermore, in the electrical junction box 100 of the present embodiment, the bus bars 10D and 10E are subjected to radiation heat dissipation of the first heat dissipation portion 70. Specifically, radiation convection of the first heat dissipation portion 70 is performed on the lower surfaces of the bus bars 10D and 10E.

[0099] The portion of the bottom wall 31 facing the lower surface of the bus bars 10D and 10E corresponds to the first heat dissipation portion 70. Hereinafter, for convenience, the portion of the bottom wall 31 facing the lower surface of the bus bars 10D and 10E is referred to as a portion corresponding to the first heat dissipation portion 70.

[0100] As described above, the inner side surface of the portion corresponding to the first heat dissipation portion 70 faces the lower surface of the bus bars 10D and 10E, and the outer side surface thereof is exposed to the outside air. In addition, the portion corresponding to the first heat dissipation portion 70 is separated from the bus bars 10D and 10E by about 1 mm.

[0101] As described above, since the interval between the first heat dissipation part 70 and the bus bars 10D and 10E is narrow, heat dissipation based on heat radiation is prioritized. Therefore, the heat generated by the bus bars 10D and 10E is transferred from the lower surface to the first heat dissipation part 70 by radiation, and is cooled via the outer side surface of the first heat dissipation part 70.

[0102] As described above, in the electrical junction box 100 of the present embodiment, the radiation in the first heat dissipating portion 70 and the convection in the second heat dissipating portion 60 can be appropriately combined to improve the heat dissipation efficiency of the relay 40A and the bus bar 10 .

[0103] The electrical junction box 100 of this embodiment is not limited to the above description, and the housing 50 may also include an insulating filler (for example, oxide ceramic). In this case, the insulation of the housing 50 can be ensured while improving heat conduction, and the heat dissipation effect of the first heat dissipation portion 70 and the second heat dissipation portion 60 can be improved.

[0104] 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.

[0105] 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).

[0106] Description of Reference Numerals

[0107] 10, 10A, 10B, 10C, 10D, 10E Busbar

[0108] 20 Upper shell

[0109] 21, 21A, 21B, 21C Top wall

[0110] 22 Sidewall

[0111] 23 Top wall through hole

[0112] 24 Side wall through hole

[0113] 25 snap-fit ​​part

[0114] 30 Lower housing

[0115] 31 bottom wall

[0116] 33 Sidewall

[0117] 35 Engagement protrusion

[0118] 37 Fixing holes

[0119] 40A Relay

[0120] 50 Shell

[0121] 60 Second heat dissipation unit

[0122] 70 First heat dissipation unit

[0123] 100 Electrical connection box

[0124] 101A One end

[0125] 101C Flat Section

[0126] 102A Other parts

[0127] 102C Opposite side

[0128] 103C Opposite side

[0129] 200 Screws

[0130] 211C Protrusion

[0131] 213C Cover

[0132] 311 Rib

[0133] 312 Clamping parts

[0134] 500 Battery Pack

Claims

1. An electrical connection box, comprising a housing for accommodating a plurality of bus bars, wherein heat from the bus bars is dissipated to the outside through the housing, wherein: The electrical connection box has: A first heat dissipation portion is provided at a position spaced apart from the bus bar by a distance less than a first distance and performs heat dissipation by radiation; and The second heat dissipating portion is spaced apart from the bus bar by a distance equal to or greater than a second distance, and performs heat dissipation by convection.

2. The electrical connection box according to claim 1, wherein: The emissivity of the housing is greater than the emissivity of the bus bar.

3. The electrical connection box according to claim 1 or 2, wherein: One surface of the first heat dissipation portion faces the bus bar, and the other surface of the first heat dissipation portion is exposed to external air.

4. The electrical connection box according to claim 1 or 2, wherein: The second heat dissipation portion has a through hole.

5. The electrical connection box according to claim 4, wherein: A fixing member protrudes at a position facing the through hole, and the fixing member fixes the bus bar to another member.

6. The electrical connection box according to claim 5, wherein: The electrical connection box includes a fixed wall, the fixed wall being fixed to an object. The plurality of bus bars include one bus bar, one main surface of the one bus bar is opposite to the side wall intersecting the fixed wall, and the one bus bar extends along the side wall, The side wall has the second heat dissipation portion at a position opposing the end portion of the one bus bar from which the fixing member protrudes, and has the first heat dissipation portion at a position opposing a portion of the one bus bar other than the end portion.

7. The electrical connection box according to claim 6, wherein: The first heat dissipation portion is provided on the other main surface side of the other portion.

8. The electrical connection box according to claim 6, wherein: The plurality of bus bars include other bus bars including a flat portion having an opposing surface opposing the fixing wall, The fixed wall has the first heat dissipation portion at a position opposite to the opposite surface of the flat portion. The fixing member protrudes from an opposite surface of the flat portion, which is opposite to the opposing surface, and the second heat dissipation portion is provided on the opposite surface side.

9. The electrical connection box according to claim 1, wherein: The first interval is smaller than the second interval.

Images