Electrical connection box

Abstract

Improved heat dissipation performance is achieved. The electrical connection box (A) comprises: a box body (10) formed by assembling a side wall member (14) on the outer side of a base member (13); and a busbar (12) housed in a busbar storage chamber (44) of the side wall member (14). A heat dissipation space (72) is formed between the base member (13) and the side wall member (14). The heat dissipation space (72) connects the busbar storage chamber (44) to the outside of the box body (10). Heat in the busbar storage chamber (44) is released to the outside of the box body (10) through the heat dissipation space (72).

Description

Technical Field

[0001] The present disclosure relates to an electrical junction box. Background Art

[0002] Patent Document 1 discloses an electrical connection box in which busbars are mounted on a resin electronic component block. The busbars are housed in a busbar assembly formed in the electronic component block. The upper surface of the busbar assembly is widely open to the outside of the electronic component block, exposing the busbars through this opening. Heat generated by the busbars during power flow is dissipated from the opening of the busbar assembly to the outside of the electronic component block.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Laid-Open No. 2020-080587 Summary of the Invention

[0006] Problems to be solved by the invention

[0007] Because the busbars in this electrical junction box are exposed over a wide area on the outer surface of the electronic component block, there is a risk of foreign matter interfering with the busbars. One possible solution is to narrow the opening of the busbar assembly to reduce the exposed area of ​​the busbars. However, reducing the exposed area of ​​the busbars makes it difficult to dissipate heat from the busbars, trapping them within the electronic component block.

[0008] The electrical junction box of the present disclosure is completed based on the above-mentioned circumstances, and aims to improve the heat dissipation performance.

[0009] Solutions to Problems

[0010] The electrical connection box of the present disclosure comprises:

[0011] a box body formed by assembling side wall members on the outer side of a base member; and

[0012] The busbar is housed in the busbar housing chamber of the side wall member.

[0013] A heat dissipation space is formed between the base member and the side wall member, and the heat dissipation space allows the busbar accommodating chamber to communicate with the outside of the box body.

[0014] Effects of the Invention

[0015] According to the present disclosure, it is possible to improve heat dissipation performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a perspective view of the electrical connection box.

[0017] Figure 2 It is a top view of the electrical connection box.

[0018] Figure 3 It is a bottom view of the electrical connection box.

[0019] Figure 4 This is a perspective view showing a state where the electrical junction box is separated into a base member and side wall members.

[0020] Figure 5 It is a three-dimensional diagram of the base member.

[0021] Figure 6 This is a perspective view showing a state where the side wall member is separated into the side wall body and the busbar.

[0022] Figure 7 It is a front sectional view showing the locking structure of the anti-slip hole of the side wall member and the anti-slip protrusion of the base member.

[0023] Figure 8 It is a front cross-sectional view showing the fitting structure between the opening of the side wall member and the protrusion of the base member. DETAILED DESCRIPTION

[0024] [Description of Embodiments of the Present Disclosure]

[0025] First, embodiments of the present disclosure will be described.

[0026] Electrical connection box disclosed herein

[0027] (1) It comprises: a box body, which is formed by assembling a side wall member on the outer side of a base member; and a busbar, which is accommodated in a busbar storage chamber of the side wall member, and a heat dissipation space is formed between the base member and the side wall member, and the heat dissipation space connects the busbar storage chamber to the outside of the box body. According to the structure disclosed in the present invention, even if the opening area of ​​the busbar storage chamber in the outer surface of the box body is small, the heat in the busbar storage chamber is released to the outside of the box body through the heat dissipation space. The electrical connection box disclosed in the present invention can prevent foreign matter from interfering with the busbar in the busbar storage chamber, and can achieve improved heat dissipation performance.

[0028] (2) Preferably, the side wall member includes an inner wall portion that separates the busbar storage chamber from the heat dissipation space, and a notch portion is formed in the inner wall portion to connect the busbar storage chamber and the heat dissipation space. According to this structure, heat in the busbar storage chamber is released to the heat dissipation space through the notch portion. Because the length of this heat dissipation path is only the thickness of the inner wall portion, the heat dissipation efficiency is good.

[0029] (3) In (2), preferably, the base member is formed with a retaining protrusion, and the retaining protrusion engages with the notch portion, thereby maintaining the base member and the side wall member in an assembled state. According to this structure, since the notch portion connecting the busbar storage chamber and the heat dissipation space also has the function of maintaining the base member and the side wall member in an assembled state, the shape of the side wall member can be simplified.

[0030] (4) In (3), preferably, the side wall member is formed with a locking protrusion, the locking protrusion protruding from the opening edge of the notch portion and locking with the anti-slip protrusion, and the locking protrusion abuts against the outer side surface of the base member to ensure the heat dissipation space. According to this structure, since the locking protrusion that holds the base member and the side wall member in the assembled state also has the function of ensuring the heat dissipation space, the shape of the side wall member can be simplified.

[0031] (5) Preferably, the box body has a component storage chamber, the component storage chamber is surrounded by a peripheral wall portion and is open on the upper surface of the box body, and a portion of the side wall member that is above the heat dissipation space constitutes the peripheral wall portion in a state facing the component storage chamber, and the upper end of the heat dissipation space is connected to the component storage chamber. According to this structure, the heat in the busbar storage chamber is released to the upper outside of the box body through the heat dissipation space and the component storage chamber in sequence. Because the side wall member constitutes the peripheral wall portion in a state facing the component storage chamber, the box body can be miniaturized in the thickness direction of the side wall member and the peripheral wall portion, compared with a structure in which the peripheral wall portion is integrally formed on the base member and the side wall member and the outer surface of the peripheral wall portion overlap.

[0032] [Details of the embodiments of the present disclosure]

[0033] Will Figure 1 、 4 , the lower left corner of 5, Figure 2 、 3 The left side and Figure 6 The upper left corner of the image is defined as the front. Figure 1 、 4 The directions shown in 8 are defined as upward and downward. Figure 7 、 8 The directions shown are defined as left and right as they are.

[0034] <Overview of Electrical Junction Box A>

[0035] The electrical connection box A of the first embodiment functionally comprises a box body 10 (see Figures 1 to 3 ) and a pair of busbars 12 symmetrically on both sides (refer to Figure 6A component storage chamber 11 is formed within the box body 10. The upper surface of the component storage chamber 11 is open in a square shape. The component storage chamber 11 is surrounded by a peripheral wall portion 23 that is square in plan view. A plurality of electrical components 73, such as fuses, are stored in the component storage chamber 11.

[0036] like Figure 1 、 4 As shown, the electrical junction box A is structurally constructed by assembling a base member 13 and a pair of bilaterally symmetrical side wall members 14, which are separate components from the base member 13. The pair of side wall members 14 are assembled to the base member 13 so as to sandwich the base member 13 from the left and right. The base member 13 and the side wall members 14 constitute the box body 10. The busbars 12 constitute the side wall members 14.

[0037] A pair of left and right front fitting portions 15 are formed at the front end portion of the base member 13, and a pair of left and right rear fitting portions 16 are formed at the rear end portion of the base member 13. Figure 4 As shown, a pair of left and right front insert portions 17 are formed at the front end portion of the side wall member 14, and a pair of left and right rear insert portions 18 are formed at the rear end portion of the side wall member 14. The base member 13 and the side wall member 14 are held in an assembled state by the engagement of the front insert portions 15 with the front insert portions 17, and the engagement of the rear insert portions 16 with the rear insert portions 18.

[0038] <Base Member 13>

[0039] The base member 13 includes a holding member 19 made of synthetic resin, a terminal block 30 made of synthetic resin as a component separate from the holding member 19, and a pair of metal plates 35 that are symmetrical with each other. Figure 4 、 5 As shown, the retaining member 19 is a single component having a main body 20, a front plate 21, and a rear plate 22. The main body 20 is formed into a rectangular shape with its long sides oriented in the front-to-back direction. The front plate 21 extends upward from the front end edge of the main body 20, and the rear plate 22 extends upward from the rear end edge of the main body 20. The space enclosed by the upper surface of the main body 20, the rear surface of the front plate 21, and the front surface of the rear plate 22 functions as the component storage chamber 11. The front plate 21 and the rear plate 22 form a peripheral wall 23. When the side wall member 14 is not assembled to the base member 13, the component storage chamber 11 is open to the outside of the base member 13 at the upper surface of the base member 13 and on both the left and right sides of the base member 13.

[0040] like Figure 5 、 8As shown, a protrusion 24 is formed at the front end of the left and right outer side surfaces of the main body 20. The protrusion 24 is a portion constituting the outer wall of the cavity 25 formed at the front end of the main body 20. The protrusion 24 protrudes laterally in a stepped manner relative to other areas of the outer side surface of the main body 20. The protrusion size of the protrusion 24 is the same size as the thickness of the inner wall portion 42 of the side wall member 14 described later. Figure 5 、 7 As shown, a pair of anti-dropout protrusions 26 are formed on the left and right outer side surfaces of the main body 20 at intervals in the front-back direction. They protrude from the outer surface of the main body 20 toward the side wall member 14.

[0041] A pair of symmetrical rear fitting portions 16 are formed at the left and right ends of the rear plate portion 22. A guide groove 27 is formed in the rear fitting portion 16, which is elongated in the vertical direction and open forward and upward. A locking hole 28 is formed in the rear fitting portion 16, extending through the rear fitting portion 16 in the front-to-back direction and communicating with the interior of the guide groove 27.

[0042] like Figure 5 As shown, the terminal block 30 is assembled to the retaining member 19 in a manner overlapping with the front surface of the front plate portion 21. A pair of front side fitting portions 15 are formed at the left and right ends of the terminal block 30. A groove portion 31 in the vertical direction that is open to the upper and rear is formed on the rear surface of the front side fitting portion 15. Bolt holes 32 (see FIG. 1 ) are formed in the terminal block 30 and pass through the terminal block 30. Figure 3 ).

[0043] like Figure 5 As shown, the plate 35 is a single component having a plate-shaped power supply portion 36 and a plate-shaped mounting portion 37 connected at right angles. The plate-shaped mounting portion 37 extends horizontally forward from the upper end of the plate-shaped power supply portion 36 and is arranged on the upper surface of the terminal block 30. When the plate 35 is mounted on the base member 13, the plate-shaped power supply portion 36 is accommodated between the front plate portion 21 and the terminal block 30, and the plate-shaped mounting portion 37 is placed on the upper surface of the terminal block 30. A mounting hole 38 is formed in the plate-shaped mounting portion 37 in a manner matching the bolt hole 32. A power supply terminal (not shown) connected to a battery (not shown) is connected to the plate-shaped power supply portion 36.

[0044] <Side Wall Member 14>

[0045] like Figure 6As shown, the side wall member 14 is constructed by assembling a side wall body 40 made of synthetic resin and a busbar 12 made of metal. The side wall body 40 is a single component whose top view shape is slender in the front-to-back direction and whose wall thickness direction is oriented in the left-right direction. The upper end side portion of the side wall member 14 constitutes the peripheral wall portion 23. The side wall body 40 has an outer wall portion 41 whose wall thickness direction is oriented in the left-to-right direction, and an inner wall portion 42 whose wall thickness direction is oriented in the left-to-right direction. The upper end side portion of the inner wall portion 42 faces the component storage chamber 11. The lower end side portion of the front end edge portion of the side wall body 40 functions as the front side embedding portion 17. The lower end side portion of the rear end edge portion of the side wall body 40 functions as the rear side embedding portion 18. A protruding locking portion (not shown) is formed on the rear end face of the side wall body 40.

[0046] like Figure 7 、 8 As shown, a busbar storage chamber 44 is formed inside the side wall body 40 and is sandwiched between the outer wall portion 41 and the inner wall portion 42. The busbar storage chamber 44 is a narrow space with a left-right dimension smaller than the front-back dimension and the top-bottom dimension. Figures 6-8 As shown, a busbar mounting opening 45 is formed on the lower surface of the side wall body 40 . The busbar mounting opening 45 opens in a slit shape in the front-rear direction. The busbar mounting opening 45 is an opening for mounting the busbar 12 in the busbar storage chamber 44 .

[0047] like Figure 4 、 6 As shown in FIG. 8 , a widened portion 46 having a width greater than that of the lower end portion of the side wall body 40 is formed at the upper end portion of the side wall body 40. A plurality of fuse storage chambers 47 opened on the upper surface of the side wall body 40 are arranged in a row in the front-to-back direction within the widened portion 46. The lower ends of the plurality of fuse storage chambers 47 are connected to the busbar storage chamber 44. Fuses 48 are installed from the upper side of the side wall member 14 to the fuse storage chamber 47 (see FIG. 1 ). Figure 1 ). The lead wire 49 on one side of the fuse 48 is connected to the protrusion 63 of the busbar 12. In the lower end side area of ​​the widened portion 46, a plurality of storage recesses 50 opened on the lower surface of the side wall body 40 are arranged in a row in the front-to-back direction. The upper ends of the plurality of storage recesses 50 are individually connected to the lower ends of the plurality of fuse storage chambers 47. A wiring harness terminal 52 connected to the electric wire 51 is stored in each storage recess 50 (see Figure 1 The harness terminal 52 is connected to the other lead wire 49 of the fuse 48 .

[0048] like Figure 4 、 6As shown in Figures 1-8, an opening 54, a pair of retaining holes 55, a pair of locking protrusions 56, and a communication hole 57 are formed in the lower end region of the inner wall portion 42, i.e., at the same height as the main body 20 of the base member 13. The opening 54 is formed in the front end region of the inner wall portion 42. The opening 54 opens at the lower end edge of the inner wall portion 42, allowing the busbar storage chamber 44 to communicate with the exterior of the side wall body 40. The pair of retaining holes 55 are positioned rearward of the opening 54 and spaced apart from each other in the front-to-back direction. The retaining holes 55 connect the interior of the busbar storage chamber 44 to the exterior of the side wall body 40. A pair of locking protrusions 56 protrude from the lower edges of the opening edges of the retaining holes 55. The locking protrusions 56 protrude in the opposite direction of the busbar storage chamber 44 in the left-right direction and toward the base member 13. The communication hole 57 is disposed between the pair of anti-drop holes 55 , and allows the inside of the busbar storage chamber 44 to communicate with the outside of the side wall body 40 .

[0049] like Figures 6-8 As shown, the busbar 12 is a single component formed by bending a metal flat plate punched into a predetermined shape. The busbar 12 comprises a flat base plate portion 61 with its thickness oriented in the left-right direction, a flat heat sink portion 62, multiple tabs 63, and a flat connecting plate portion 64. When viewed from the side of the busbar 12, the base plate portion 61 and the heat sink portion 62 form a rectangular shape. The heat sink portion 62 is arranged so as to overlap the inner surface of the base plate portion 61. The lower edges of the base plate portion 61 and the heat sink portion 62 are connected via a U-shaped bend 65. Multiple tabs 63 protrude upward from the upper edge of the base plate portion 61 and are arranged spaced apart in the front-to-back direction. The connecting plate portion 64 protrudes horizontally inward from the upper edge of a support portion 66 at the front end of the base plate portion 61. A through hole 67 is formed in the connecting plate portion 64, extending vertically through the base plate portion 61.

[0050] The busbar 12 is assembled from the bottom relative to the side wall body 40. Specifically, the base plate portion 61, the heat dissipation plate portion 62 and the protrusion 63 are housed in the busbar housing chamber 44 from the busbar mounting opening 45. The base plate portion 61 is arranged in a manner overlapping with the outer wall portion 41. The heat dissipation plate portion 62 is arranged in a manner overlapping with the inner wall portion 42. When the side wall member 14 is removed from the base member 13, the heat dissipation plate portion 62 is exposed to the outside of the side wall body 40 at the anti-detachment hole 55 and the opening portion 54. The connecting plate portion 64 is connected from the connecting groove 68 (refer to Figure 6 ) protrudes outward from the side wall body 40. The connecting plate portion 64 protrudes inwardly from the side wall body 40 in the left-right direction, that is, toward the base member 13. The bent portion 65 at the lower edge of the busbar 12 is located near the busbar mounting opening 45.

[0051] <Assembly Steps of Electrical Junction Box A>

[0052] When assembling the electrical connection box A, with the retaining member 19 and the terminal block 30 separated, the plate-shaped mounting portion 37 of the plate 35 is placed on the terminal block 30 so that the plate-shaped power supply portion 36 overlaps the rear surface of the terminal block 30. When the terminal block 30 and the plate 35 are assembled in this state, the plate 35 is held between the retaining member 19 and the terminal block 30, and the assembly of the base member 13 is completed.

[0053] After assembling the base member 13, the electrical components 73 are mounted on the holding member 19 so that they are stored in the component storage chamber 11 from above the base member 13. Because the component storage chamber 11 is open to the left and right sides of the base member 13, if the operator grasps the electrical components 73 from either side, their fingers will not interfere with the base member 13. When the electrical components 73 are mounted using an automated machine, if the fingers of the automated machine hold the components 73 from both sides, these fingers will not interfere with the base member 13 either.

[0054] Next, a pair of side wall members 14 are assembled to the base member 13. During assembly, the front side embedded portion 17 is inserted into the groove portion 31 of the front side interlocking portion 15 from above, and the rear side embedded portion 18 is inserted into the guide groove 27 of the rear side interlocking portion 16 from above. When the side wall members 14 reach a predetermined assembled state relative to the base member 13, the protruding locking portion (not shown) formed at the rear end of the side wall member 14 is locked with the locking hole 28. The protrusion 24 of the base member 13 enters the opening 54 and becomes opposed to the heat dissipation plate portion 62. By engaging the front side embedded portion 17 with the front side interlocking portion 15, the side wall member 14 is positioned relative to the base member 13 in the front-to-back direction and the left-to-right direction.

[0055] At the rear end of the box body 10, the side wall member 14 is restricted from upwardly disengaging from the base member 13 by the engagement of a protruding locking portion (not shown) with the locking hole 28. Between the base member 13 and the side wall member 14, the edge of the retaining hole 55 and the retaining protrusion 56 protruding from the opening edge of the retaining hole 55 engage with the retaining protrusion 26. The retaining action of the retaining hole 55 and the retaining protrusion 56 against the retaining protrusion 26 restricts the side wall member 14 from upwardly disengaging from the base member 13.

[0056] When the side wall member 14 is mounted on the base member 13, the component storage chamber 11 is covered from both the left and right sides by the side wall member 14, and the assembly of the electrical connection box A is completed. The front plate portion 21, the rear plate portion 22, and the side wall member 14 constitute the peripheral wall portion 23, and the component storage chamber 11 is surrounded by the peripheral wall portion 23 all around from the front-to-back direction and the left-to-right direction. The connecting plate portion 64 of the busbar 12 overlaps with the upper surface of the plate-shaped mounting portion 37 of the plate 35. When the bolt 70 is inserted through the through hole 67, the mounting hole 38, and the bolt hole 32 and screwed into the nut 71 provided on the terminal block 30 and tightened, the plate 35 and the busbar 12 are fixed to the terminal block 30. By fixing the connecting plate portion 64 to the terminal block 30, the front end portion of the side wall member 14 is fixed to the front end portion of the base member 13.

[0057] like Figure 2 、 3 As shown in Figures 7 and 8, when the base member 13 and the side wall member 14 are assembled, a pair of left and right heat dissipation spaces 72 are formed between the base member 13 and the side wall member 14. The heat dissipation space 72 is a space whose left-right dimension is smaller than its up-down and front-back dimensions. Because the locking protrusion 56 protruding from the inner wall portion 42 abuts against the outer side surface of the main body 20, even if the side wall member 14 is pressed toward the base member 13, the heat dissipation space 72 will not be narrowed in the left-right direction, thereby ensuring the air flow path within the heat dissipation space 72. The lower end of the heat dissipation space 72 opens at the lower end surface of the box body 10, and the upper end of the heat dissipation space 72 is connected to the component storage chamber 11. The busbar storage chamber 44 and the heat dissipation space 72 are connected through the space between the upper end of the opening portion 54 and the upper end of the protrusion 24, the space between the anti-slip hole 55 and the anti-slip protrusion 26, and the connecting hole 57.

[0058] When power is applied to busbar 12, heat is generated therein, raising the temperature of busbar storage chamber 44. Due to the temperature difference between the outside and inside of box body 10, cooler outside air flows into heat dissipation space 72 through the opening on the lower end of box body 10, generating an upward airflow. This airflow within heat dissipation space 72 removes heat from busbar storage chamber 44 and flows into component storage chamber 11, where it is released into the atmosphere through the opening on the upper surface of box body 10.

[0059] The electrical junction box A of this embodiment comprises a box body 10 constructed by assembling a sidewall member 14 on the outer surface of a base member 13; and busbars 12 housed in a busbar storage chamber 44 of the sidewall member 14. A heat dissipation space 72 is formed between the base member 13 and the sidewall member 14, connecting the busbar storage chamber 44 to the exterior of the box body 10. The opening of the busbar storage chamber 44 on the outer surface of the box body 10 is a busbar mounting opening 45 on the lower surface of the box body 10. Because the opening area of ​​the busbar mounting opening 45 is relatively small, foreign matter is unlikely to interfere with the busbars 12 within the busbar storage chamber 44. Despite the small opening area of ​​the busbar mounting opening 45, heat within the busbar storage chamber 44 is dissipated to the exterior of the box body 10 through the heat dissipation space 72 and the component storage chamber 11. Therefore, the electrical junction box A of this embodiment prevents foreign matter from interfering with the busbars 12 and achieves improved heat dissipation performance.

[0060] The side wall member 14 includes an inner wall portion 42 that separates the busbar storage chamber 44 from the heat dissipation space 72. The inner wall portion 42 includes an opening 54, a retaining hole 55, and a communication hole 57, which serve as a notch for connecting the busbar storage chamber 44 and the heat dissipation space 72. Heat within the busbar storage chamber 44 is released to the heat dissipation space 72 through the opening 54, retaining hole 55, and communication hole 57. The heat dissipation path through the opening 54, retaining hole 55, and communication hole 57 is only as long as the thickness of the inner wall portion 42, resulting in excellent heat dissipation efficiency.

[0061] The base member 13 is formed with a retaining protrusion 26, which engages with the retaining hole 55 to maintain the base member 13 and the side wall member 14 in their assembled state. In other words, the retaining hole 55, which connects the busbar storage chamber 44 and the heat dissipation space 72, also serves to maintain the base member 13 and the side wall member 14 in their assembled state. This simplifies the shape of the side wall member 14 compared to a case where a portion for maintaining the base member 13 and the side wall member 14 in their assembled state is formed separately from the retaining hole 55.

[0062] The side wall member 14 is formed with a latching protrusion 56 that protrudes from the opening edge of the retaining hole 55 and latches with the retaining protrusion 26. The latching protrusion 56 abuts the outer surface of the base member 13, thereby ensuring a heat dissipation space 72. The latching protrusion 56, which holds the base member 13 and the side wall member 14 in the assembled state, also functions to ensure the heat dissipation space 72. Therefore, the shape of the side wall member 14 can be simplified compared to a case where a dedicated portion for ensuring the heat dissipation space 72 is formed independently of the latching protrusion 56 on the inner wall portion 42.

[0063] The box body 10 has a component storage chamber 11, which is surrounded by a peripheral wall portion 23 and opens on the upper surface of the box body 10. The portion of the side wall member 14 above the heat dissipation space 72 constitutes the peripheral wall portion 23 in a state facing the component storage chamber 11. The upper end of the heat dissipation space 72 is connected to the component storage chamber 11. According to this structure, the heat in the busbar storage chamber 44 is released to the upper outside of the box body 10 through the heat dissipation space 72 and the component storage chamber 11 in sequence. Because the side wall member 14 constitutes the peripheral wall portion 23 in a state facing the component storage chamber 11, the box body 10 can be miniaturized in the thickness direction of the side wall member 14 and the peripheral wall portion 23, that is, in the left-right direction, compared with a structure in which the base member 13 constitutes the entire periphery of the peripheral wall portion 23 and the side wall member 14 overlaps with the outer surface of the peripheral wall portion 23 (that is, a structure in which the peripheral wall portion is integrally formed on the base member and the side wall member overlaps with the outer surface of the peripheral wall portion).

[0064] [Other embodiments]

[0065] The present invention is not limited to the embodiments described above and illustrated in the drawings, but is defined by the claims. The present invention includes all modifications within the meaning and protection scope of the claims, and is intended to include the following embodiments.

[0066] In the above embodiment, the busbar housing chamber and the heat dissipation space are communicated through the notch portion of the inner wall portion. However, the busbar housing chamber and the heat dissipation space may be communicated through a path other than the notch portion.

[0067] In the above embodiment, the locking protrusion also has the function of ensuring the heat dissipation space, but a dedicated portion for ensuring the heat dissipation space may be formed separately from the locking protrusion.

[0068] In the above embodiment, the side wall member faces the component storage chamber. However, the side wall member may not face the component storage chamber but may be arranged so as to overlap with the outer surface of the peripheral wall portion of the base member.

[0069] Description of Reference Numerals

[0070] A: Electrical connection box

[0071] 10: Box body

[0072] 11: Parts Storage Room

[0073] 12: Busbar

[0074] 13: Base component

[0075] 14: Side wall components

[0076] 15: Front fitting part

[0077] 16: Rear fitting part

[0078] 17: Front embedded part

[0079] 18: Rear embedded part

[0080] 19: Keeping components

[0081] 20: Main body

[0082] 21: Front panel

[0083] 22: Rear panel

[0084] 23: Peripheral wall

[0085] 24: Protrusion

[0086] 25: Cavity

[0087] 26: Anti-slip protrusion

[0088] 27: Guide groove

[0089] 28: Locking hole

[0090] 30: Terminal block

[0091] 31: Groove

[0092] 32: Bolt hole

[0093] 35: Board

[0094] 36: Plate-shaped power supply unit

[0095] 37: Plate-shaped mounting portion

[0096] 38: Mounting hole

[0097] 40: Side wall body

[0098] 41: Outer wall

[0099] 42: Inner wall part

[0100] 44: Busbar storage room

[0101] 45: Busbar installation port

[0102] 46: Widening Department

[0103] 47: Fuse Storage Room

[0104] 48: Fuse

[0105] 49: Wire

[0106] 50: Storage recess

[0107] 51: Wires

[0108] 52: Wiring terminal

[0109] 54: opening (notch)

[0110] 55: Anti-drop hole (notch)

[0111] 56: Locking protrusion

[0112] 57: Communication hole (notch)

[0113] 61: Substrate part

[0114] 62: Radiator

[0115] 63: Tab

[0116] 64: Connecting plate

[0117] 65: Bending part

[0118] 66: Support

[0119] 67: Through hole

[0120] 68: Connecting groove

[0121] 70: Bolt

[0122] 71: Nut

[0123] 72: Heat dissipation space

[0124] 73: Electrical components

Claims

1. An electrical connection box comprising: a box body formed by assembling side wall members on the outer side of a base member; and The busbar is housed in the busbar housing chamber of the side wall member. A heat dissipation space is formed between the base member and the side wall member, and the heat dissipation space allows the busbar accommodating chamber to communicate with the outside of the box body.

2. The electrical connection box according to claim 1, wherein The side wall member has an inner wall portion that separates the busbar storage chamber from the heat dissipation space. A notch portion is formed in the inner wall portion so as to allow the busbar storage chamber to communicate with the heat dissipation space.

3. The electrical connection box according to claim 2, wherein: The base member is formed with a retaining protrusion, and the retaining protrusion is engaged with the notch portion, thereby maintaining the base member and the side wall member in an assembled state.

4. The electrical connection box according to claim 3, wherein: A locking protrusion is formed on the side wall member, the locking protrusion protruding from the opening edge of the notch portion and locking with the anti-slip protrusion. The locking protrusion abuts against the outer side surface of the base member, thereby ensuring the heat dissipation space.

5. The electrical connection box according to any one of claims 1 to 4, wherein: The box body has a component storage chamber, which is surrounded by a peripheral wall and opens on the upper surface of the box body. The portion of the side wall member above the heat dissipation space forms the peripheral wall portion in a state facing the component storage chamber. The upper end of the heat dissipation space is communicated with the component storage chamber.

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