Busbar fastening structure and electrical connection box

Abstract

The busbar fastening structure disclosed herein comprises: an electronic component having a terminal (33) and heating up when energized; a fastening member; a fastening busbar (60) electrically connected to the electronic component by fastening it to the terminal (33) using the fastening member; and a connecting busbar (70) electrically connected to a portion of the fastening busbar (60) other than the fastened portion (61) fastened by the fastening member, wherein the fastening busbar (60) has a higher strength than the connecting busbar (70).

Description

Technical Field

[0001] This disclosure relates to busbar fastening structures and electrical connection boxes. Background Technology

[0002] Previously, a fastening structure described in Japanese Patent Application Publication No. 2023-82637 (hereinafter referred to as Patent Document 1) was known. The fastening structure described in Patent Document 1 includes: a first fastened member comprising pure aluminum or an aluminum alloy, a second fastened member comprising metal, and a fastening member for fastening the first fastened member and the second fastened member to each other. On the surface of the first fastened member facing the second fastened member, a protrusion comprising pure aluminum or an aluminum alloy protrudes toward the second fastened member. The pure aluminum or aluminum alloy of the protrusion of the first fastened member is in direct contact with the metal of the second fastened member. Existing technical documents Patent documents

[0003] Patent document 1: Japanese Patent Application Publication No. 2023-82637. Summary of the Invention The problem that the invention aims to solve

[0004] As with the fastening structure described above, pure aluminum is preferred from the perspectives of conductivity and lightweighting. However, pure aluminum has low strength, and the first fastened component (busbar) may deform due to the axial force during fastening.

[0005] This disclosure is based on the above-mentioned situation and aims to suppress the deformation of the busbar due to the axial force during tightening. Technical solutions to the problem

[0006] The busbar fastening structure disclosed herein comprises: an electronic component having terminals and heating up when energized; a fastening member; a fastening busbar electrically connected to the electronic component by fastening it to the terminals using the fastening member; and a connecting busbar electrically connected to a portion of the fastening busbar other than the fastened portion fastened by the fastening member, wherein the fastening busbar has higher strength than the connecting busbar. Invention Effects

[0007] According to this disclosure, it is possible to suppress deformation of the busbar due to axial force during tightening. Attached Figure Description

[0008] Figure 1 This is an exploded perspective view of the electrical connection box according to Embodiment 1. Figure 2 This is a top view of the electrical connection box according to Embodiment 1. Figure 3This is an enlarged front view of the area near the relay involved in Implementation Method 1. Figure 4 yes Figure 3 AA sectional view. Figure 5 This is an enlarged front view of the area near the relay involved in Implementation Method 2. Figure 6 yes Figure 5 BB cross-sectional view. Figure 7 This is an enlarged front view of the area near the relay involved in Implementation Method 3. Figure 8 yes Figure 7 CC section view. Figure 9 This is an enlarged front view of the area near the relay involved in Implementation Method 4. Figure 10 yes Figure 9 DD sectional view. Figure 11 This is an enlarged front view of the area near the relay involved in Embodiment 1. Figure 12 This is an enlarged front view of the area near the relay involved in Embodiment 2. Figure 13 This is an enlarged front view of the area near the relay involved in Embodiment 3. Figure 14 This is an enlarged front view of the area near the relay involved in Embodiment 4. Figure 15 This is an enlarged front view of the area near the relay involved in Embodiment 5. Figure 16 This is an enlarged front view of the area near the relay involved in Embodiment 6. Figure 17 This is an enlarged front view of the area near the relay involved in Embodiment 7. Figure 18 This is an enlarged front view of the area near the relay involved in Embodiment 8. Figure 19 This is an enlarged front view of the area near the relay involved in Embodiment 9. Figure 20 This is a perspective view showing the internal structure of the electrical connection box according to Embodiment 5. Figure 21 This is an exploded perspective view of the electrical connection box according to Embodiment 5. Figure 22 yes Figure 21 A cross-sectional view near the fuse. Figure 23 This is a cross-sectional view of the vicinity of the fuse involved in Embodiment 10. Figure 24This is a cross-sectional view of the vicinity of the fuse involved in Embodiment 11. Figure 25 This is a cross-sectional view of the vicinity of the fuse involved in Embodiment 12. Figure 26 This is a cross-sectional view of the vicinity of the fuse involved in Embodiment 13. Figure 27 This is a cross-sectional view of the vicinity of the fuse involved in Embodiment 14. Detailed Implementation

[0009] [Description of embodiments of this disclosure] First, the embodiments of this disclosure are listed and described. [1] The busbar fastening structure disclosed herein comprises: an electronic component having a terminal and heating up when energized; a fastening member; a fastening busbar electrically connected to the electronic component by fastening it to the terminal using the fastening member; and a connecting busbar electrically connected to a portion of the fastening busbar other than the fastened portion fastened by the fastening member, wherein the fastening busbar has a higher strength than the connecting busbar.

[0010] The fastening busbar is electrically connected to the electronic component by fastening it to the terminal of the electronic component using fastening members. During fastening, the fastening busbar is subjected to axial force from the fastening members, but because the fastening busbar has higher strength than the connecting busbar, it can suppress the deformation of the fastening busbar due to the axial force during fastening.

[0011] Furthermore, since the connecting busbar is electrically connected to the fastening busbar except for the fastened portion fastened by the fastening member, even if the fastening busbar deforms slightly, the connecting busbar can be prevented from deforming accordingly. Therefore, for example, pure aluminum can be used as the material for the connecting busbar, making the busbar fastening structure lightweight.

[0012] [2] In the above [1], preferably, the fastening member has a bolt head, and the connecting manifold has: a bolt clearance hole that avoids the bolt head, and a joined portion formed around the bolt clearance hole and engaged with the fastening manifold. Because the joint is formed around the bolt clearance hole, deformation of the joint can be suppressed.

[0013] [3] In [1] or [2] above, preferably, the fastening busbar has a heat removal portion formed in a non-energized area, which is different from the energized area between the fastening busbar and the connecting busbar. The fastening busbar has a heat removal section formed in a non-electrical area, so the heat capacity can be obtained by utilizing the heat removal section without affecting the conductivity, and the heat generated by the electronic components can be dissipated to the heat removal section.

[0014] [4] In any of the above [1] to [3], preferably, the heat removal section is formed in a folded-back shape. The heat removal section is formed in a folded-back shape, which allows for a smaller busbar fastening structure compared to forming the heat removal section in a straight line.

[0015] [5] In any of the above [1] to [4], preferably, a heat removal manifold is also provided and fastened together with the fastening manifold. It can utilize the heat removal busbar to obtain heat capacity and dissipate the heat generated by electronic components to the heat removal busbar.

[0016] [6] In any of the above [1] to [5], preferably, the fastening manifold is surface treated. For example, surface treatments such as electroplating can suppress the formation of an oxide film on the surface of the fastening busbar, thereby reducing the contact resistance between the fastening busbar and the connecting busbar.

[0017] [7] In any of the above [1] to [6], preferably, at least one of the fastening manifold and the connecting manifold is thermally connected to the cooling surface. It is possible to use a cooling surface to cool at least one of the fastening busbar and the connecting busbar.

[0018] [8] In any of the above [1] to [7], preferably, the thermal conductivity and electrical conductivity of the connecting busbar are higher than those of the fastening busbar. The use of connecting busbars can ensure heat dissipation and conductivity.

[0019] [9] In any of the above [1] to [8], preferably, when viewed from the fastening direction of the fastening member, the junction of the connecting busbar and the fastening busbar is at least on one side of the conductive path direction. The bonding position is located at least on one side of the conductive path direction, thus ensuring good conductivity.

[0020]

[10] In any of the above [1] to [9], preferably, the engagement position of the connecting busbar and the fastening busbar is configured along at least two sides around the fastening member. It can fully ensure the bonding strength between the connecting busbar and the fastening busbar.

[0021]

[11] The electrical connection box of this disclosure may include: the busbar fastening structure described in any of [1] to

[10] above; and other electronic components, which are electrically connected to the electronic components via the fastening busbar and the connecting busbar.

[0022] [Details of the embodiments of this disclosure] The embodiments of this disclosure will now be described. This disclosure is not limited to these examples, but is defined by the claims and is intended to include all modifications within the same meaning and scope as the claims. In the accompanying drawings, for ease of explanation, parts of the structure are sometimes shown exaggeratedly or simplified. Furthermore, the dimensional proportions of the various parts may differ in the accompanying drawings. The term "orthogonal" in this specification includes not only strictly orthogonal cases, but also cases where they are substantially orthogonal to the extent that they contribute to the function and effect of this embodiment.

[0023] Furthermore, in this specification, "facing each other" refers to a position where surfaces or components are facing each other, including not only cases where they are completely facing each other, but also cases where they are partially facing each other. In addition, "facing each other" in this specification includes not only cases where a component different from the two parts is sandwiched between them, but also cases where nothing is sandwiched between the two parts.

[0024] <Implementation Method 1> Reference Figures 1 to 4 The following description will describe Embodiment 1 of this disclosure. In the following description, the direction indicated by arrow Z will be upward, the direction indicated by arrow X will be forward, and the direction indicated by arrow Y will be left. In addition, for multiple identical components, sometimes only some components are labeled with reference numerals, and the reference numerals of other components are omitted.

[0025] (Electrical connection box JB) The electrical connection box JB of this embodiment is mounted in vehicles such as electric vehicles and hybrid vehicles, and is configured on the power supply path from the battery to loads such as the electric motor. Figure 2 As shown, the electrical connection box JB can be connected to external busbars 2 and 3. External busbars 2 and 3 are used to electrically connect equipment (including batteries) located outside the electrical connection box JB to the electrical connection box JB. External busbars 2 and 3 have portions disposed outside the electrical connection box JB. External busbar 2 is electrically connected to the battery. External busbar 3 is electrically connected to the load. The connection between external busbars 2 and 3 and the electrical connection box JB is achieved by bolt fastening. Figure 1 As shown, the electrical connection box JB includes a housing 10, a fuse 20 (an example of other electronic components), a relay 30 (an example of electronic components), a first busbar 40, and a second busbar 50.

[0026] (Shell 10) The housing 10 is made of synthetic resin and includes a lower housing 11 and an upper housing 12. The upper housing 12 is mounted overlapping the lower housing 11. When connecting the external busbars 2 and 3 to the electrical connection box JB by bolts, if bolts B1 and B3 are tightened from above, as shown... Figures 1 to 3 As shown, the upper housing 12 is positioned above the lower housing 11. Hereinafter, with the upper housing 12 positioned above the lower housing 11, the structure and arrangement of the components of the electrical connection box JB will be described.

[0027] (Lower shell 11) like Figure 1 As shown, the lower housing 11 is formed into a tray shape that is longer in the front-to-back direction. A fuse 20, a relay 30, a first busbar 40, and a second busbar 50 are disposed in the lower housing 11. The fuse 20 is disposed on the front side of the lower housing 11. Bolts B1 and B2 are fastened to the terminal portions 22 formed on the front and rear sides of the fuse 20, respectively. The relay 30 is disposed on the rear side of the lower housing 11. Bolt B3 is fastened to the rear end of the second busbar 50.

[0028] (Upper shell 12) like Figure 1 As shown, the upper housing 12 is cover-shaped. The upper housing 12 includes a first busbar receiving portion 12A for receiving the first busbar 40 and a second busbar receiving portion 12B for receiving the second busbar 50. Each busbar receiving portion 12A and 12B is configured to be a groove shape adapted to the shape of each busbar 40 and 50. At the front end of the upper housing 12, a window portion 12C is provided for connecting the terminal portion 22 of the fuse 20 to the external busbar 2.

[0029] (Fuse 20) The fuse 20 includes a main body 21 and two terminal portions 22 extending from the front and rear ends of the main body 21. The main body 21 is block-shaped. The terminal portions 22 are made of metal. The terminal portions 22 are thinner plates in the vertical direction. The terminal portions 22 are fastened to the fixing nuts (not shown) of the lower housing 11 by bolts B1 and B2.

[0030] (Relay 30) Relay 30 is a large mechanical relay powered by a high current from a storage battery. For example... Figure 3 , Figure 4As shown, the relay 30 includes a main body 31 and a partition wall 32 extending from the right side of the main body 31. The main body 31 is block-shaped. Two terminals 33 are formed on the right side of the main body 31. The terminals 33 are arranged to the right, slightly protruding from the right side of the main body 31. A bottomed recess 34 is formed inside the terminal 33, opening to the right and recessed to the left. An internal thread is formed on the inner circumferential surface of the recess 34. An external thread is formed on the outer circumferential surface of the shaft portion B52 of bolts B4 and B5. The external threads of bolts B4 and B5 can enter the recess 34 of the terminal 33 and engage with the internal thread. Thus, bolts B4 and B5 are respectively fastened to each terminal 33. The two terminals 33 of the relay 30 are arranged with the partition wall 32 between them.

[0031] (Busbar fastening structure) The first busbar 40 and the second busbar 50 are components made of conductive metal sheets through punching and bending. The second busbar 50 has a relay connection part 51 that connects to the terminal 33 of the relay 30, and an external connection part 52 that connects to the external busbar 3. The relay connection part 51 has a through hole for a bolt B4 to be inserted. The external connection part 52 has a through hole for a bolt B3 to be inserted.

[0032] The first busbar 40 includes a fuse connection portion 41 connected to the terminal portion 22 of the fuse 20, a relay connection portion 42 (an example of a busbar fastening structure) connected to the terminal 33 of the relay 30, an intermediate portion 43 connecting the fuse connection portion 41 and the relay connection portion 42, and an extension portion 44 extending from the intermediate portion 43 to a position forward of the fuse connection portion 41. The fuse connection portion 41 has a through hole for inserting a bolt B2. The relay connection portion 42 has a through hole for inserting a bolt B5 (an example of a fastening member).

[0033] Bolt B2 is fastened to fuse connection 41, and bolt B5 is fastened to relay connection 42. Fuse connection 41 extends to the left from the front end of the middle part 43. The middle part 43 is plate-shaped and extends in the front-rear direction. Extension 44 is arranged using the space to the right of fuse 20 and has the function of dissipating heat from fuse 20 and relay 30 to first busbar 40 to housing 10.

[0034] like Figure 4 As shown, the relay connection portion 42 includes: a fastening busbar 60, which is fastened to the terminal 33 by a bolt B5 and electrically connected to the relay 30; and a connecting busbar 70, which is electrically connected to a busbar engagement area 62 in the fastening busbar 60, excluding the fastened portion 61 fastened by the bolt B5. A engagement portion 45 is formed between the busbar engagement area 62 and the connecting busbar 70. The fastening busbar 60 has higher strength than the connecting busbar 70.

[0035] Bolt B5 has a bolt head B51. Connecting busbar 70 has a bolt clearance hole 71 that avoids the bolt head B51, and a engaged portion 72 formed around the bolt clearance hole 71 and engaging with the fastening busbar 60. The engaged portion 72 is thermally connected to the heat removal member H. For example, the heat removal member H may also contact the surface of the engaged portion 72 opposite to the fastening busbar 60. The heat removal member H corresponds to the "cooling surface" of this disclosure, such as the housing 10 of the electrical connection box JB or the frame of the battery pack.

[0036] As the fastening busbar 60, a high-strength busbar (e.g., high-strength aluminum such as 6000 series aluminum alloy, copper, etc.) is preferably used. This prevents the fastening busbar 60 from deforming due to axial force when tightening bolt B5. On the other hand, as the connecting busbar 70, pure aluminum (e.g., 1000 series aluminum) is preferably used from the viewpoints of conductivity and lightweight. The fastening busbar 60 and the connecting busbar 70 are mechanically and electrically connected. Preferably, the thermal conductivity and electrical conductivity of the connecting busbar 60 are higher than those of the fastening busbar 70. This allows for heat capacity to be obtained near the relay 30.

[0037] The busbar 60 for fastening can also undergo surface treatment to reduce contact resistance. Examples of surface treatments include electroplating, anodizing, thermal spraying, and coating. Examples of electroplating include nickel plating and tin plating. By doing so, the material of the busbar 60 for fastening can be selected without considering contact resistance as a problem.

[0038] Examples of the joining method for the joint 45 and the material of the fastening manifold 60 used in the joining method are as follows. 1. Ultrasonic welding: copper and aluminum materials 2. Laser welding: Aluminum materials (nickel plating is also possible) 3. Electromagnetic pulse: Copper material 4. Mechanical riveting: copper and aluminum materials

[0039] According to ultrasonic welding, since dissimilar materials can be joined, copper can be selected as the material for the fastening busbar 60, but aluminum can also be selected. According to laser welding, since dissimilar materials cannot be joined, aluminum is used as the material for the fastening busbar 60. According to electromagnetic pulse welding, since dissimilar materials can be joined, copper can be selected as the material for the fastening busbar 60, but aluminum can also be selected. According to mechanical riveting, if it is a riveting method that can join dissimilar materials, copper can be selected as the material for the fastening busbar 60, but aluminum can also be selected.

[0040] Since the joint portion 45 is formed by joining the joint portion 72 formed around the bolt clearance hole 71 to the fastening busbar 60, buckling of the connecting busbar 70 during fastening can be avoided, while heat capacity can be obtained using the fastening busbar 60. Furthermore, since the joint portion 45 can be made wider, the bonding strength between the fastening busbar 60 and the connecting busbar 70 can be improved. In addition, viewed from the fastening direction, the joint portion 45 is at least on one side in the conductive path direction, thus ensuring excellent conductivity.

[0041] (Effects of Implementation Method 1) The relay connection portion 42 according to Embodiment 1 includes: a relay 30 having a terminal 33 and heating up when energized; a bolt B5; a fastening busbar 60, which is fastened to the terminal 33 by the bolt B5 and electrically connected to the relay 30; and a connecting busbar 70, which is electrically connected to a busbar engagement area 62 of the fastening busbar 60 excluding the fastened portion 61 fastened by the bolt B5, wherein the fastening busbar 60 has higher strength than the connecting busbar 70. The relay 30 is electrically connected to the fuse 20 via the fastening busbar 60 and the connecting busbar 70.

[0042] The fastening busbar 60 is electrically connected to the relay 30 by fastening it to the terminal 33 of the relay 30 using bolt B5. During fastening, the fastening busbar 60 is subjected to axial force from bolt B5, but because the fastening busbar 60 has higher strength than the connecting busbar 70, deformation of the fastening busbar 60 due to the axial force during fastening can be suppressed.

[0043] Furthermore, the connecting busbar 70 is electrically connected to the busbar engagement area 62 of the fastening busbar 60, excluding the fastened portion 61 secured by bolt B5. Therefore, even if the fastening busbar 60 deforms slightly, the connecting busbar 70 can be prevented from deforming accordingly. As a result, pure aluminum can be used as the material for the connecting busbar 70, making the relay connection portion 42 and even the electrical connection box JB lighter.

[0044] Bolt B5 has a bolt head B51, and the connecting manifold 70 preferably has a bolt clearance hole 71 that avoids the bolt head B51, and a engaged portion 72 formed around the bolt clearance hole 71 and engaged with the fastening manifold 60. Since the joined portion 72 is formed around the bolt relief hole 71, deformation of the joined portion 72 can be suppressed.

[0045] The preferred fastening manifold 60 is surface treated. For example, surface treatments such as electroplating can suppress the formation of an oxide film on the surface of the fastening busbar 60, thereby reducing the contact resistance between the fastening busbar 60 and the connecting busbar 70.

[0046] <Implementation Method 2> Reference Figure 5 , Figure 6 The following describes Embodiment 2 of this disclosure. Except for the busbar fastening structure (relay connection parts 42, 51) of Embodiment 1, the electrical connection box JB2 of Embodiment 2 is constructed in a substantially the same way as that of Embodiment 1. Therefore, the description of components and effects that are the same as those in Embodiment 1 is sometimes omitted.

[0047] The electrical connection box JB2 includes relay connection portions 422 and 512. The relay connection portions 422 and 512 include a fastening busbar 602 and a connecting busbar 70. A joint portion 45 is formed between the busbar engagement area 62 of the fastening busbar 602 and the connecting busbar 70. The fastening busbar 602 has higher strength than the connecting busbar 70.

[0048] The fastening busbar 602 has a heat removal portion H2 formed in a non-energized region R2, which is different from the energized region R1. The heat removal portion H2 extends upward from the busbar joining region 62. The energized region R1 mainly corresponds to the region formed by merging the region where the joining portion 45 is formed and the region extending to the right (in the direction of the conductive path) from that region. The non-energized region R2 corresponds to the region extending upward from the region where the joining portion 45 is formed (in a direction different from the direction of the conductive path).

[0049] According to this embodiment, heat capacity can be obtained using the heat removal portion H2 of the fastening busbar 602. In particular, since the heat removal portion H2 is formed in the non-energized region R2, heat capacity can be obtained using the heat removal portion H2 without affecting conductivity, and the heat generated by the relay 30 can be dissipated to the heat removal portion H2. Furthermore, viewed from the fastening direction, the joint 45 is at least on one side in the conductive path direction, thus ensuring good conductivity.

[0050] <Implementation Method 3> Reference Figure 7 , Figure 8 The following describes Embodiment 3 of this disclosure. Except for the busbar fastening structure (relay connection parts 42, 51) of Embodiment 1, the electrical connection box JB3 involved in Embodiment 3 is constructed in a substantially the same way as that in Embodiment 1. Therefore, the description of components and effects that are the same as those in Embodiment 1 is sometimes omitted.

[0051] The electrical connection box JB3 includes relay connection parts 423 and 513. The relay connection parts 423 and 513 include a fastening busbar 60, a connecting busbar 703, and a heat removal busbar 80. A joint 453 is formed between the busbar engagement area 62 of the fastening busbar 60 and the connecting busbar 703. The fastening busbar 60 has higher strength than the connecting busbar 703. The heat removal busbar 80 can be made of inexpensive materials (such as iron, copper, or strong aluminum).

[0052] The connecting busbar 703 is shorter in the left-right direction than the connecting busbar 70 of Embodiment 1. The end edge of the connecting busbar 703 is offset in the left-right direction so as not to overlap with the bolt B53. In this embodiment, no bolt clearance hole is formed on the connecting busbar 703 to avoid the bolt head, and the heat removal busbar 80 and the fastening busbar 60 are fastened together. By doing so, the heat capacity can be obtained using the heat removal busbar 80, and the heat generated by the relay 30 can be dissipated to the heat removal busbar 80. In addition, when viewed from the fastening direction, the joint 453 is at least on one side in the conductive path direction, thus ensuring good conductivity.

[0053] <Implementation Method 4> Reference Figure 9 , Figure 10 The following describes Embodiment 4 of this disclosure. Except for the busbar fastening structure (relay connection parts 42, 51) of Embodiment 1, the electrical connection box JB4 involved in Embodiment 4 is constructed in a substantially the same way as that in Embodiment 1. Therefore, the description of components and effects that are the same as those in Embodiment 1 is sometimes omitted.

[0054] The electrical connection box JB4 includes relay connection portions 424 and 514. The relay connection portions 424 and 514 include a fastening busbar 604 and a connecting busbar 70. A joint portion 45 is formed between the busbar engagement area 62 of the fastening busbar 604 and the connecting busbar 70. The fastening busbar 604 has higher strength than the connecting busbar 70.

[0055] The fastening busbar 604 has a heat removal portion H4 formed in a non-energized region R4, which is different from the energized region R1. The heat removal portion H4 extends upward from the busbar engagement region 62. The energized region R1 mainly corresponds to the region formed by merging the region where the engagement portion 45 is formed and the region extending to the right (in the direction of the conductive path) from that region. The non-energized region R4 corresponds to the region that extends upward (in a direction different from the direction of the conductive path) from the region where the engagement portion 45 is formed and then folds back downward.

[0056] According to this embodiment, heat capacity can be obtained using the heat removal portion H4 of the fastening busbar 604. In particular, the heat removal portion H4 is formed by extending upwards and then folding downwards, thus allowing for miniaturization of the electrical connection box JB4 in the vertical direction compared to forming a straight heat removal portion. Since heat capacity can be obtained using the heat removal portion H4, the heat generated by the relay 30 can be dissipated to the heat removal portion H4. Furthermore, viewed from the fastening direction, the joint portion 45 is at least on one side in the conductive path direction, thus ensuring excellent conductivity.

[0057] <Examples 1-9> Reference Figures 11 to 19 Embodiments 1 to 9 of this disclosure will be described. The electrical connection box JB involved in Embodiments 1 to 9 is constructed in a substantially similar manner to that of Embodiment 1, except that the joining method of Embodiment 1 is further specified. Therefore, the description of components and effects that are the same as those in Embodiment 1 is sometimes omitted.

[0058] exist Figure 11 In the illustrated embodiment 1, the connecting busbar 70 is joined to the fastening busbar 60 by laser welding. The laser welding is performed in a circumferential pattern to surround the fastening portions of bolts B4 and B5. Laser welding can also be performed multiple times in a non-overlapping manner, for example, with square or door-frame shaped weld lines. The joining position is indicated by reference numeral JP1.

[0059] exist Figure 12 In Embodiment 2 shown, the connecting busbar 70 is joined to the fastening busbar 60 by laser welding. Laser welding is performed on both the upper and lower sides of the fastening portions of bolts B4 and B5. For example, laser welding can be performed with multiple weld lines extending in a straight line in the left-right direction and running side-by-side in the up-down direction. The joining position is indicated by reference numeral JP2.

[0060] exist Figure 13 In Embodiment 3, the connecting busbar 70 is joined to the fastening busbar 60 by laser welding. The laser welding is performed in an L-shape on the lower and right sides of the fastening portion of bolt B4, and in a linear fashion on the lower side of the fastening portion of bolt B5. For example, laser welding can be performed along the upper and right sides of the fastening busbar 60 to obtain a joint area. Alternatively, laser welding can be performed, for example, with multiple weld lines extending in a straight line in the left-right direction between the lower side of the fastening busbar 60 and bolt B5, arranged side-by-side in the vertical direction, to obtain a joint area. The joint position is indicated by reference numeral JP3. According to Embodiment 3, since the joint position JP3 is configured along at least two sides around bolt B4, the joint strength of the connecting busbar 70 relative to the fastening busbar 60 can be sufficiently ensured.

[0061] exist Figure 14 In the illustrated embodiment 4, the connecting busbar 70 is joined to the fastening busbar 60 by laser welding. Laser welding is performed on both the upper and lower sides of the fastening portions of bolts B4 and B5. For example, laser welding can be performed with multiple weld lines arranged in a circular pattern in the left-right direction. The joining position is indicated by reference numeral JP4.

[0062] exist Figure 15 In Embodiment 5, the connecting busbar 70 is joined to the fastening busbar 60 by laser welding. The laser welding is performed in an L-shape on the lower and right sides of the fastening portion of bolt B4, and in a linear fashion on the lower side of the fastening portion of bolt B5. Alternatively, the laser welding can be performed in a circular shape along the upper and right sides of the fastening busbar 60 to obtain a joint area. Furthermore, the laser welding can be performed, for example, with multiple circular welding lines arranged side-by-side and vertically between the lower side of the fastening busbar 60 and bolt B5 to obtain a joint area. The joint position is indicated by reference numeral JP5. According to Embodiment 5, since the joint position JP5 is configured along at least two sides around bolt B4, the joint strength of the connecting busbar 70 relative to the fastening busbar 60 can be sufficiently ensured.

[0063] exist Figure 16 In the illustrated embodiment 6, the connecting busbar 70 is joined to the fastening busbar 60 by ultrasonic welding. Ultrasonic welding is performed on both the upper and lower sides of the fastening portions of bolts B4 and B5. For example, ultrasonic welding can be performed with the weld portion being a rectangle that is longer in the left-right direction. The joining position is indicated by reference numeral JP6.

[0064] exist Figure 17 In Embodiment 7, the connecting busbar 70 is joined to the fastening busbar 60 by ultrasonic welding. Ultrasonic welding is performed in an L-shape on the lower and right sides of the fastening portion of bolt B4, and on the lower side of the fastening portion of bolt B5. For example, ultrasonic welding can be performed along the upper and right sides of the fastening busbar 60 to obtain a joint area. Alternatively, ultrasonic welding can be performed, for example, in a rectangular shape where the welded portion is longer in the left-right direction between the lower side of the fastening busbar 60 and bolt B5 to obtain a joint area. The joint position is indicated by reference numeral JP7. According to Embodiment 7, since the joint position JP7 is configured along at least two sides around bolt B4, the joint strength of the connecting busbar 70 relative to the fastening busbar 60 can be sufficiently ensured.

[0065] exist Figure 18In the illustrated embodiment 8, the connecting busbar 70 is joined to the fastening busbar 60 by mechanical riveting. The mechanical riveting is performed at the two corners of the fastening portion, separated by bolts B4 and B5. For example, the mechanical riveting can be performed with the crimped portion forming a rectangle that is longer in the left-right direction at the upper right and lower left corners of the fastening busbar 60. Alternatively, the mechanical riveting can also be performed with the crimped portion forming a rectangle that is longer in the left-right direction at the upper left and lower right corners of the fastening busbar 60. The joining position is indicated by reference numeral JP8.

[0066] exist Figure 19 In the illustrated embodiment 9, the connecting busbar 70 is joined to the fastening busbar 60 by mechanical riveting. The mechanical riveting is performed below the fastening portions of bolts B4 and B5. For example, the mechanical riveting can be performed with the crimped portion forming a roughly square shape at the lower right and lower left corners of the fastening busbar 60. Alternatively, the mechanical riveting can be performed with the crimped portion forming a longer rectangle in the left-right direction between the lower edge of the fastening busbar 60 and bolt B5, utilizing a single point to obtain the joint area. The joint position is indicated by reference numeral JP9.

[0067] <Implementation Method 5> Reference Figures 20 to 22 The following describes Embodiment 5 of this disclosure. Except for the construction of the lower housing 11 and the fastening structure of the first busbar 40, the electrical connection box JB5 in Embodiment 5 is constructed in a substantially the same way as in Embodiment 1. Therefore, the description of components and effects that are the same as in Embodiment 1 is sometimes omitted.

[0068] (Electrical connection box JB5) The electrical connection box JB5 of this embodiment includes a housing 105, a fuse 20 (an example of an electronic component), a relay 30 (an example of another electronic component), a first busbar 405, and a second busbar 50.

[0069] (Shell 105) The housing 105 is made of synthetic resin and includes a lower housing 115 and an upper housing 12. The upper housing 12 is mounted on top of the lower housing 115. When the external busbars 2 and 3 are connected to the electrical connection box JB5 by bolts, with bolts B1 and B3 tightened from above, the upper housing 12 is positioned above the lower housing 115. Hereinafter, the structure and configuration of the electrical connection box JB5 will be described with the upper housing 12 positioned above the lower housing 115.

[0070] (Lower shell 115) like Figure 20 as well as Figure 21As shown, the lower housing 115 is formed into a tray shape that is longer in the front-to-back direction. The fuse 20, relay 30, first busbar 405, and second busbar 50 are disposed in the lower housing 115. Figure 21 As shown, a fuse mounting section 115A for mounting a fuse 20 is formed in the front part of the lower housing 115, opening upwards. The fuse mounting section 115A is a bottomed recess that can accommodate the main body 21 of the fuse 20.

[0071] like Figure 21 as well as Figure 22 As shown, fastening parts N1 and N2, capable of respectively fastening bolts B1 and B2, are provided on the front and rear sides of the fuse mounting section 115A. Figure 21 As shown, the front and rear sides of the fuse mounting section 115A are provided with terminal blocks 11B, which are fixed with fasteners N1 and N2 such as nuts. The terminal section 22 of the fuse 20 (an example of the terminal of an electronic component) is fastened to the fasteners N1 and N2. In this embodiment, a heat dissipation member HM is mounted on the front fastener N1, and the terminal section 22 is connected to the fastener N1 via the heat dissipation member HM, but the heat dissipation member HM may not be provided.

[0072] like Figure 21 As shown, a mounting surface 11C for mounting the relay 30 and a positioning portion 11D for positioning the relay 30 are formed on the rear side of the lower housing 115. The positioning portion 11D is a recessed portion that extends from the side wall portion 11E, which rises upward from the right edge of the mounting surface 11C. The relay 30 is positioned relative to the lower housing 115 by engaging the positioning portion 11D with the partition wall 32. A fastening portion N3 for fastening with bolt B3 is fixed at the rear end of the lower housing 115. In addition, a fixing portion (not shown) for fixing the relay 30 may be further provided on the mounting surface 11C of the lower housing 115.

[0073] (Fastening structure of the first busbar 405) The first busbar 405 is a component made of conductive metal sheet by punching and bending. The first busbar 405 has a middle portion 435 extending in the front-rear direction, a relay connection portion 42 formed at the rear end of the middle portion 435, and a fuse connection portion 415 formed at the front end of the middle portion 435.

[0074] The relay connection portion 42 of the first busbar 405 has a through hole 42A through which a bolt B5 can be inserted, and the relay connection portion 51 of the second busbar 50 has a through hole 51A through which a bolt B4 can be inserted. Bolts B4 and B5 are inserted into the through holes 42A and 51A and tightened to the terminals 33 of the relay 30, thereby electrically connecting the first busbar 405 and the second busbar 50 via the relay 30.

[0075] The fuse connection part 415 is connected to the lower front edge of the intermediate part 435. For example... Figure 22 As shown, the fuse connection part 415 includes a fuse 20, fastening members (bolt B2, fastening part N2), a fastening busbar 605, and a connecting busbar 705. Figure 21 As shown, the connecting busbar 705 includes a first horizontal portion 705A extending to the left from the lower edge of the front end of the middle portion 435, a first vertical portion 705B extending downward from the left edge of the first horizontal portion 705A, a second horizontal portion 705C extending to the left from the lower edge of the first vertical portion 705B, a second vertical portion 705D extending upward from the rear edge of the second horizontal portion 705C, and a third horizontal portion 705E extending rearward from the upper edge of the second vertical portion 705D. The fuse connection portion 415 corresponds to the "busbar fastening structure" of this disclosure.

[0076] The second horizontal section 705C is configured corresponding to the fuse mounting section 115A, and the third horizontal section 705E of the connecting busbar 705 and the fastening busbar 605 are configured corresponding to the rear terminal block 11B. Figure 22 As shown, the second horizontal portion 705C contacts the bottom surface of the fuse arrangement portion 115A. The second horizontal portion 705C is thermally connected to the heat removal member H via the bottom surface of the fuse arrangement portion 115A. A thermally conductive sheet may also be sandwiched between the second horizontal portion 705C and the bottom surface of the fuse arrangement portion 115A to improve thermal conductivity. The bottom surface of the fuse arrangement portion 115A and the heat removal member H correspond to the "cooling surface" of this disclosure. On the other hand, the third horizontal portion 705E of the connecting busbar 705 does not contact the terminal block 11B, and a predetermined gap is formed between the third horizontal portion 705E of the connecting busbar 705 and the terminal block 11B.

[0077] The third horizontal portion 705E of the connecting busbar 705 has a bolt clearance hole 715 for the bolt B2 and the fastening portion N2, and a mating portion 725 formed around the bolt clearance hole 715. The fastening busbar 605 is mated to the mating portion 725. The area of ​​the fastening busbar 605 other than the fastening portion 615 fastened by the bolt B2 is designated as the busbar mating area 625. The connecting busbar 705 is electrically connected to the busbar mating area 625 by mating. A mating portion 455 is formed between the busbar mating area 625 and the mating portion 725 of the connecting busbar 705. The mating method of the mating portion 455 is the same as that of the mating portion 45 in Embodiment 1. The fastening busbar 605 has higher strength than the connecting busbar 705.

[0078] The fastened portion 615 of the fastening busbar 605 is electrically connected to the terminal portion 22 of the fuse 20 by fastening with bolt B2 and fastening portion N2. Therefore, the terminal portion 22 of the fuse 20 is electrically connected to the connecting busbar 705 via the fastening busbar 605. On the other hand, the external busbar 2 is electrically connected to the terminal portion 22 of the fuse 20 by fastening with bolt B1 and fastening portion N1.

[0079] (Effects of Implementation Method 5) The fuse connection portion 415 according to Embodiment 5 includes: a fuse 20 having a terminal portion 22 that heats up when energized; fastening members (bolts B1, B2 and fastening portions N1, N2); a fastening busbar 605 electrically connected to the fuse 20 by fastening it to the terminal portion 22 using the fastening members; and a connecting busbar 705 electrically connected to portions of the fastening busbar 605 other than the fastened portion 615 fastened by the fastening members, wherein the fastening busbar 605 has higher strength than the connecting busbar 705. The fuse 20 is electrically connected to the relay 30 via the fastening busbar 605 and the connecting busbar 705.

[0080] The fastening busbar 605 is electrically connected to the fuse 20 by fastening it to the terminal portion 22 of the fuse 20 using a fastening member. During fastening, the fastening busbar 605 is subjected to an axial force from the fastening member, but since the fastening busbar 605 has higher strength than the connecting busbar 705, deformation of the fastening busbar 605 due to the axial force during fastening can be suppressed.

[0081] Furthermore, the connecting busbar 705 is electrically connected to the fastening part 615 of the fastening busbar 605, except for the fastened part 615 fastened by the fastening member. Therefore, even if the fastening busbar 605 deforms slightly, the connecting busbar 705 can be prevented from deforming accordingly. Thus, for example, pure aluminum can be used as the material for the connecting busbar 705, which can make the fuse connection part 415 and even the electrical connection box JB5 lighter.

[0082] Furthermore, according to this embodiment, heat dissipation can be achieved using the space below the fuse 20, and even when there is no space between the fastening member and the fuse 20, the connecting busbar 705 can still contact the heat removal member H. Figure 22 In this configuration, the main body 21 of the fuse 20 is in contact with the second horizontal portion 705C, but the main body 21 can also be separated from the second horizontal portion 705C. In this case, the heat generated by the fuse 20 is dissipated to the heat removal member H via the terminal portion 22, the fastening busbar 605, the third horizontal portion 705E, the second vertical portion 705D, the second horizontal portion 705C, and the bottom surface of the fuse mounting portion 115A.

[0083] <Examples 10-14> Reference Figures 23 to 27 Embodiments 10 to 14 of this disclosure will be described. The electrical connection box JB5 involved in Embodiments 10 to 14 has made partial changes to the fastening structure of Embodiment 5, and is constructed in a substantially similar manner to Embodiment 5. Therefore, the description of components and effects that are the same as those in Embodiment 5 is sometimes omitted.

[0084] exist Figure 23 In Embodiment 10, a fastening busbar 160 is disclosed as a structure corresponding to the fastening busbar 605 in Embodiment 5; a connecting busbar 170 is disclosed as a structure corresponding to the connecting busbar 705 in Embodiment 5; and a fuse connecting portion 141 is disclosed as a structure corresponding to the fuse connecting portion 415 in Embodiment 5. The fuse connecting portion 141 includes a fuse 20, fastening members (bolt B2, fastening portion N2), the fastening busbar 160, and the connecting busbar 170.

[0085] The fastening busbar 160 includes a fastened portion 161 for connection to the terminal portion 22 of the fuse 20, a vertical portion 160B extending downward from the leading edge of the fastened portion 161, a horizontal portion 160A extending forward from the lower edge of the vertical portion 160B, and a busbar engagement region 162 extending rearward from the fastened portion 161. The busbar engagement region 162 is located rearward than the rear end of the terminal portion 22. The area of ​​the fastening busbar 160 other than the fastened portion 161 fastened by the bolt B2 is designated as the busbar engagement region 162. The connecting busbar 170 has an engagement portion 172.

[0086] The horizontal part 160A contacts the bottom surface of the fuse mounting part 115A. Figure 23 In this configuration, the main body 21 of the fuse 20 is in contact with the horizontal portion 160A, but the main body 21 can also be separated from the horizontal portion 160A. In this case, the heat generated by the fuse 20 is dissipated to the heat removal member H via the bottom surface of the terminal portion 22, the fastened portion 161, the vertical portion 160B, the horizontal portion 160A, and the fuse mounting portion 115A. The bottom surface of the fuse mounting portion 115A and the heat removal member H correspond to the "cooling surface" of this disclosure. On the other hand, the busbar engagement area 162 of the fastening busbar 160 does not contact the terminal block 11B, and a predetermined gap is formed between the busbar engagement area 162 of the fastening busbar 160 and the terminal block 11B.

[0087] The joined portion 172 of the connecting busbar 170 is electrically connected to the busbar engagement region 162 by engagement. An engagement portion 145 is formed between the busbar engagement region 162 and the joined portion 172 of the connecting busbar 170. The engagement method of the engagement portion 145 is the same as that of the engagement portion 45 in Embodiment 1. The fastening busbar 160 has higher strength than the connecting busbar 170.

[0088] The fastened portion 161 of the fastening busbar 160 is electrically connected to the terminal portion 22 of the fuse 20 by fastening with bolt B2 and fastening portion N2. Therefore, the terminal portion 22 of the fuse 20 is electrically connected to the connecting busbar 170 via the fastening busbar 160. According to this embodiment, heat dissipation can be achieved without passing through the joint portion 145.

[0089] exist Figure 24 In Embodiment 11, a fastening busbar 260 is disclosed as a structure corresponding to the fastening busbar 605 in Embodiment 5; a connecting busbar 270 is disclosed as a structure corresponding to the connecting busbar 705 in Embodiment 5; and a fuse connecting portion 241 is disclosed as a structure corresponding to the fuse connecting portion 415 in Embodiment 5. The fuse connecting portion 241 includes a fuse 20, fastening members (bolt B2, fastening portion N2), a fastening busbar 260, and a connecting busbar 270.

[0090] The fastening busbar 260 includes a fastened portion 261 for connection to the terminal portion 22 of the fuse 20, a busbar engagement region 262 extending rearward from the fastened portion 261, a vertical portion 260B extending downward from the rear edge of the busbar engagement region 262, and a horizontal portion 260A extending forward from the lower edge of the vertical portion 260B. The busbar engagement region 262 is located rearward than the rear end of the terminal portion 22. The area of ​​the fastening busbar 260 other than the fastened portion 261 fastened by the bolt B2 is designated as the busbar engagement region 262. The connecting busbar 270 has an engagement portion 272.

[0091] The horizontal portion 260A contacts the bottom surface of the fuse arrangement portion 115A. Heat generated by the fuse 20 is dissipated to the heat removal member H via the terminal portion 22, the fastened portion 261, the busbar engagement area 262, the vertical portion 260B, the horizontal portion 260A, and the bottom surface of the fuse arrangement portion 115A. The contact area between the horizontal portion 260A and the bottom surface of the fuse arrangement portion 115A is larger than the contact area between the horizontal portion 160A and the bottom surface of the fuse arrangement portion 115A in Embodiment 10. Therefore, the heat dissipation effect of Embodiment 11 is greater than that of Embodiment 10.

[0092] The joined portion 272 of the connecting busbar 270 is electrically connected to the busbar engagement region 262 by engagement. An engagement portion 245 is formed between the busbar engagement region 262 and the joined portion 272 of the connecting busbar 270. The engagement method of the engagement portion 245 is the same as that of the engagement portion 45 in Embodiment 1. The fastening busbar 260 has higher strength than the connecting busbar 270.

[0093] The fastened portion 261 of the fastening busbar 260 is electrically connected to the terminal portion 22 of the fuse 20 by fastening with bolt B2 and fastening portion N2. Therefore, the terminal portion 22 of the fuse 20 is electrically connected to the connecting busbar 270 via the fastening busbar 260.

[0094] exist Figure 25 In Embodiment 12, a fastening busbar 360 is disclosed as a structure corresponding to the fastening busbar 605 in Embodiment 5; a connecting busbar 370 is disclosed as a structure corresponding to the connecting busbar 705 in Embodiment 5; and a fuse connecting portion 341 is disclosed as a structure corresponding to the fuse connecting portion 415 in Embodiment 5. The fuse connecting portion 341 includes a fuse 20, fastening members (bolt B2, fastening portion N2), a fastening busbar 360, and a connecting busbar 370.

[0095] The fastening busbar 360 includes a fastened portion 361 for connection to the terminal portion 22 of the fuse 20, and a busbar engagement region 362 extending downward from the leading edge of the fastened portion 361. The area of ​​the fastening busbar 360 other than the fastened portion 361 fastened by the bolt B2 is designated as the busbar engagement region 362. The connecting busbar 370 includes a engaged portion 372 that engages with the busbar engagement region 362 of the fastening busbar 360, and a horizontal portion 370A extending forward from the lower edge of the engaged portion 372.

[0096] The horizontal portion 370A of the connecting busbar 370 contacts the bottom surface of the fuse mounting portion 115A. Heat generated by the fuse 20 is dissipated to the heat removal member H via the terminal portion 22, the fastened portion 361, the busbar engagement area 362, the engaged portion 372, the horizontal portion 370A, and the bottom surface of the fuse mounting portion 115A. On the other hand, the fastened portion 361 of the fastening busbar 360 does not contact the terminal block 11B, and a predetermined gap is formed between the fastened portion 361 of the fastening busbar 360 and the terminal block 11B.

[0097] The joined portion 372 of the connecting busbar 370 is electrically connected to the busbar engagement region 362 by engagement. An engagement portion 345 is formed between the busbar engagement region 362 and the joined portion 372 of the connecting busbar 370. The engagement method of the engagement portion 345 is the same as that of the engagement portion 45 in Embodiment 1. The fastening busbar 360 has higher strength than the connecting busbar 370.

[0098] The fastened portion 361 of the fastening busbar 360 is electrically connected to the terminal portion 22 of the fuse 20 by fastening with bolt B2 and fastening portion N2. Therefore, the terminal portion 22 of the fuse 20 is electrically connected to the connecting busbar 370 via the fastening busbar 360.

[0099] exist Figure 26 In Embodiment 13, a fastening busbar 460 is disclosed as a structure corresponding to the fastening busbar 605 in Embodiment 5; a connecting busbar 470 is disclosed as a structure corresponding to the connecting busbar 705 in Embodiment 5; and a fuse connecting portion 441 is disclosed as a structure corresponding to the fuse connecting portion 415 in Embodiment 5. The fuse connecting portion 441 includes a fuse 20, fastening members (bolt B2, fastening portion N2), a fastening busbar 460, and a connecting busbar 470.

[0100] The fastening busbar 460 includes a fastened portion 461 for connection to the terminal portion 22 of the fuse 20, and a busbar engagement region 462 extending downward from the rear edge of the fastened portion 461. The area of ​​the fastening busbar 460 other than the fastened portion 461 fastened by the bolt B2 is designated as the busbar engagement region 462. The connecting busbar 470 includes a engaged portion 472 that engages with the busbar engagement region 462 of the fastening busbar 460, and a horizontal portion 470A extending rearward from the lower edge of the engaged portion 472.

[0101] The horizontal portion 470A of the connecting busbar 470 contacts the bottom surface of the fuse mounting portion 115A. The heat generated by the fuse 20 is dissipated to the heat removal member H via the terminal portion 22, the fastened portion 461, the busbar engagement area 462, the engaged portion 472, the horizontal portion 470A, and the bottom surface of the fuse mounting portion 115A.

[0102] The joined portion 472 of the connecting busbar 470 is electrically connected to the busbar engagement region 462 by engagement. An engagement portion 445 is formed between the busbar engagement region 462 and the joined portion 472 of the connecting busbar 470. The engagement method of the engagement portion 445 is the same as that of the engagement portion 45 in Embodiment 1. The fastening busbar 460 has higher strength than the connecting busbar 470.

[0103] The fastened portion 461 of the fastening busbar 460 is electrically connected to the terminal portion 22 of the fuse 20 by fastening with bolt B2 and fastening portion N2. Therefore, the terminal portion 22 of the fuse 20 is electrically connected to the connecting busbar 470 via the fastening busbar 460.

[0104] exist Figure 27 In Embodiment 14, a fastening busbar 560 is disclosed as a structure corresponding to the fastening busbar 605 in Embodiment 5; a connecting busbar 570 is disclosed as a structure corresponding to the connecting busbar 705 in Embodiment 5; and a fuse connecting portion 541 is disclosed as a structure corresponding to the fuse connecting portion 415 in Embodiment 5. The fuse connecting portion 541 includes a fuse 20, fastening members (bolt B2, fastening portion N2), a fastening busbar 560, and a connecting busbar 570.

[0105] The fastening busbar 560 includes a fastened portion 561 for connection to the terminal portion 22 of the fuse 20, a busbar engagement region 562 extending downward from the leading edge of the fastened portion 561, and a horizontal portion 560A extending forward from the lower edge of the busbar engagement region 562. The area of ​​the fastening busbar 560 other than the fastened portion 561 fastened by the bolt B2 is designated as the busbar engagement region 562. The connecting busbar 570 includes a engaged portion 572 extending vertically, and a horizontal portion 570A extending rearward from the lower edge of the engaged portion 572.

[0106] The horizontal portions 560A and 570A contact the bottom surface of the fuse arrangement portion 115A. The heat generated by the fuse 20 is dissipated to the heat removal member H via the terminal portion 22, the fastened portion 561, the busbar engagement area 562, the horizontal portion 560A, and the bottom surface of the fuse arrangement portion 115A. Simultaneously, the heat is diverted from the busbar engagement area 562 to the engaged portion 572, and then dissipated to the heat removal member H via the horizontal portion 570A and the bottom surface of the fuse arrangement portion 115A. The contact area between the horizontal portions 560A and 570A and the bottom surface of the fuse arrangement portion 115A is larger than the contact area between the horizontal portion 160A and the bottom surface of the fuse arrangement portion 115A in Embodiment 10. Therefore, the heat dissipation effect of Embodiment 14 is greater than that of Embodiment 10.

[0107] The joined portion 572 of the connecting busbar 570 is electrically connected to the busbar engagement region 562 by engagement. An engagement portion 545 is formed between the busbar engagement region 562 and the joined portion 572 of the connecting busbar 570. The engagement method of the engagement portion 545 is the same as that of the engagement portion 45 in Embodiment 1. The fastening busbar 560 has higher strength than the connecting busbar 570.

[0108] The fastened portion 561 of the fastening busbar 560 is electrically connected to the terminal portion 22 of the fuse 20 by fastening with bolt B2 and fastening portion N2. Therefore, the terminal portion 22 of the fuse 20 is electrically connected to the connecting busbar 570 via the fastening busbar 560.

[0109] (Other implementation methods) The above-described embodiments 1 to 5 can be implemented by modifications as follows. Embodiments 1 to 5 can be combined with each other without causing technical inconsistencies. In embodiments 1 to 4 described above, a relay is exemplified as an electronic component, but the electronic component may not be a relay, as long as it has the property of generating heat when energized. Examples of electronic components include fuses, resistors, coils, capacitors, diodes, integrated circuits (ICs), field-effect transistors (FETs), and other switching elements. Furthermore, in embodiment 5 described above, a fuse is exemplified as an electronic component, but the electronic component may not be a fuse.

[0110] In the above embodiments 1 to 5, the connecting busbar is directly joined to the fastening busbar, but the connecting busbar may also be joined to the fastening busbar via a conductive component such as solder.

[0111] In embodiments 2 and 4 described above, a heat removal section formed in a non-energized area is illustrated, but a heat removal section may also be formed in an energized area.

[0112] In the above embodiment 4, a heat removal section folded back into a U-shape is illustrated, but a heat removal section bent into an L-shape can also be used.

[0113] In the above embodiment 3, it is illustrated that the heat removal busbar and the fastening busbar are fastened together, but the heat removal part folded back into a U-shape as in embodiment 4 can also be fastened together with the fastening busbar.

[0114] In the above embodiments 1 to 5, an electrical connection box is illustrated in which both the fastening busbar and the connecting busbar are housed inside the housing. However, it may also be provided as an electrical connection box in which at least one of the fastening busbar and the connecting busbar is exposed to the outside of the housing.

[0115] The thickness of the busbar used for fastening can also be greater than that of the busbar used for connection.

[0116] In the above embodiment 5, heat dissipation is performed from one terminal portion 22, but heat dissipation can also be performed from both terminal portions 22. Symbol Explanation

[0117] JB, JB2, JB3, JB4, JB5: Electrical connection box 2, 3: External busbars 10, 105: Shell 11, 115: Lower casing 11A, 115A: Fuse mounting section (cooling surface) 11B: Terminal block 11C: Placement surface 11D: Positioning Unit 11E: Side wall portion 12: Upper shell 12A: First Busbar Containment Unit 12B: Second Busbar Containment Unit 20: Fuse (other electronic components) 21: Main body 22: Terminal section 30: Relay (electronic component) 31: Main body 32: Partition wall 33: Terminal 34: concave part 40, 405: First busbar 41: Fuse connection part 141, 241, 341, 415, 441, 541: Fuse connection part (busbar fastening structure) 42, 422, 423, 424: Relay connection part (busbar fastening structure) 42A: Through-hole 43, 435: Middle section 44: Extension 45, 145, 245, 345, 445, 453, 545: Joints 50: Second busbar 51, 512, 513, 514: Relay connection parts 51A: Through-hole 52: External connection part 60, 160, 260, 360, 460, 560, 602, 604, 605: Fastening manifolds 160A, 260A, 560A: Horizontal section 160B, 260B: Vertical section 61, 161, 261, 361, 461, 561, 615: Fastened parts 62, 162, 262, 362, 462, 562, 625: Busbar junction area 70, 170, 270, 370, 470, 570, 702, 703, 705: Busbars for connection 370A, 470A, 570A: Horizontal section 705A: First Horizontal Section 705B: First Vertical Section 705C: Second Horizontal Section 705D: Second Vertical Section 705E: Third Level Section 71, 715: Bolt clearance holes 72, 172, 272, 372, 472, 572, 725: Joints 80: Busbar for thermal removal 81: Bolt clearance hole B1, B2, B3, B4: Bolts B5, B53: Bolts (fastening components) B51: Bolt head B52: Shaft portion H: Heat removal component (cooling surface) H2, H4: Heat removal section HM: Heat dissipation components JP1, JP2, JP3, JP4, JP5, JP6, JP7, JP8, JP9: joint position R1: Powered area R2, R4: Non-energized areas.

Claims

1. A busbar fastening structure, comprising: Electronic components, which have terminals and generate heat when energized; Fastening components; A fastening busbar, electrically connected to the electronic component by being fastened to the terminal using the fastening member; and The connecting busbar is electrically connected to the portion of the fastening busbar other than the fastened part fastened by the fastening member. The fastening manifold has higher strength than the connecting manifold.

2. The busbar fastening structure according to claim 1, wherein, The fastening component has a bolt head. The connecting manifold has: a bolt clearance hole that avoids the bolt head, and a mating portion formed around the bolt clearance hole and engaging with the fastening manifold.

3. The busbar fastening structure according to claim 1, wherein, The fastening busbar has a heat removal section formed in a non-energized area, which is different from the energized area between the fastening busbar and the connecting busbar.

4. The busbar fastening structure according to claim 3, wherein, The heat removal section is formed in a folded-back shape.

5. The busbar fastening structure according to claim 1, wherein, The busbar fastening structure also includes a heat removal busbar that is fastened together with the fastening busbar.

6. The busbar fastening structure according to claim 1, wherein, The fastening manifold is surface treated.

7. The busbar fastening structure according to claim 1, wherein, At least one of the fastening manifold and the connecting manifold is thermally connected to the cooling surface.

8. The busbar fastening structure according to claim 1, wherein, The thermal conductivity and electrical conductivity of the connecting busbar are higher than those of the fastening busbar.

9. The busbar fastening structure according to claim 2, wherein, Viewed from the fastening direction of the fastening member, the junction of the connecting busbar and the fastening busbar is at least on one side of the conductive path direction.

10. The busbar fastening structure according to claim 2, wherein, The engagement position of the connecting busbar and the fastening busbar is configured along at least two sides around the fastening member.

11. An electrical connection box, comprising: The busbar fastening structure according to any one of claims 1 to 10; and Other electronic components are electrically connected to the electronic components via the fastening busbar and the connecting busbar.

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