Busbar laminate

Abstract

The present application relates to a busbar laminate (10) provided with a first busbar structure (11) including at least one layer of a plate-shaped busbar having a prescribed width and extending in a long side direction, and a second busbar structure (12) provided on the first busbar structure (11) and having a branch structure extending in a direction different from the long side direction of the first busbar structure (11) via a branch portion. The second busbar structure (12) has an overlapping portion (13) in which the first busbar structure (11) and the second busbar structure (12) overlap each other in a thickness direction, the overlapping portion (13) having a prescribed width and extending in parallel with the long side direction of the first busbar structure (11). The overlapping portion (13) has a welding portion extending in the thickness direction to cause the first busbar structure (11) and the second busbar structure (12) to be welded to each other, and the branch portion includes a part or all of the welding portion.

Description

Technical Field

[0001] This invention relates to a busbar laminate for connecting automotive wiring harnesses and other branches to various electrical components. Background Technology

[0002] To connect automotive wiring harnesses and other components to various electrical devices, busbar structures that branch the busbars in multiple directions are used. These busbar structures efficiently branch the power supplied from the input-side busbars that constitute the structure to multiple busbars that also constitute the structure and are connected to the electrical devices. With the increasing density of wiring harnesses and the increasing functionality of electrical devices, various busbar structures have been proposed.

[0003] A busbar structure that branches in multiple directions is formed by connecting multiple busbars using welding. Patent Document 1 discloses a busbar structure in which the patterned portions of two stacked busbars clamp the welded portion of a terminal component, and welding is performed by supplying energy to the surface of the patterned portion of one busbar. Furthermore, Patent Document 1 discloses a busbar structure in which, to reduce the energy density supplied to the welding portion, the patterned portions of one busbar are staggered so that a portion of the welded portion of the terminal component is exposed, and welding is performed by supplying energy to both the surface of the staggered busbar's patterned portion and the exposed surface of the welded portion of the connector terminal component.

[0004] However, in the busbar structure described in Patent Document 1, which uses the patterned portions of two stacked busbars to hold the welded portion of the terminal component, if a thicker busbar is used, the heat dissipation from the busbar during welding increases, and the energy required for welding increases. Therefore, if the heat dissipation from the busbar during welding increases and the energy required for welding increases, the welding efficiency decreases, and the welding quality may deteriorate. Furthermore, in Patent Document 1, the branching direction of the busbar is changed via a terminal component located between the two busbars; therefore, it is preferable to use a busbar structure having a branching structure that allows the busbar itself to determine the branching direction without using a terminal component.

[0005] As a busbar structure with such a branching configuration, Patent Document 2 proposes a branched busbar, which has at least two or more conductive layers stacked on top of each other, with a portion of the conductive layers branching at a predetermined branching point. In Patent Document 2, a portion of the conductive layer is bent to form the branching point, and the conductive layers are integrally formed by mechanical fixing, welding, or the like.

[0006] However, when a portion of the conductive layer is bent to form a branch point, applying a strong load to the folded portion during production may cause cracking or breakage at the branch point, raising concerns about reduced yield. Furthermore, as a mechanical fixation method, when the conductive layers are fastened with bolts, the bolt holes must penetrate the conductive layer, limiting the use of wide conductive layers for the fastening. Therefore, there is a need to develop a new busbar structure that eliminates the need for mechanical fixation, provides a more secure connection between the busbars at the branch point, and allows the busbars themselves to determine the branching direction.

[0007] Existing technical documents

[0008] Patent documents

[0009] Patent Document 1: Japanese Patent Application Publication No. 2000-150013

[0010] Patent Document 2: Japanese Patent Publication No. 2023-530398 Summary of the Invention

[0011] The problem that the invention aims to solve

[0012] In view of the above, the object of the present invention is to provide a busbar laminate having a branch structure in which the branch points are more firmly connected than before and the branch direction can be determined by the busbar itself.

[0013] Methods for solving problems

[0014] An embodiment of the present invention provides a busbar laminate comprising: a first busbar structure including at least one plate-shaped busbar having a predetermined width and extending along its long side; and a second busbar structure disposed on the first busbar structure, having a branching structure extending in a direction different from the long side direction of the first busbar structure via a branching portion, the second busbar structure having an overlapping portion that causes the first busbar structure and the second busbar structure to overlap each other in the thickness direction, the overlapping portion having a predetermined width and extending parallel to the long side direction of the first busbar structure, the overlapping portion having a welding portion extending in the thickness direction to weld the first busbar structure and the second busbar structure together, and the branching portion including a portion or the entirety of the welding portion.

[0015] In one embodiment of the invention, the branch includes a portion of the welded portion, and the welded portion is formed by multiple lines parallel to the long side direction of the first busbar structure when viewed from above.

[0016] In one embodiment of the present invention, in the second busbar structure, the overlapping portion and the branch portion are integrally formed on the same busbar.

[0017] In one embodiment of the present invention, in the second busbar structure, the busbar having the branch portion is formed separately, and the busbar having the branch portion extends in a direction different from the long side direction relative to the long side direction of the first busbar structure via the branch portion.

[0018] In one embodiment of the present invention, the first busbar structure includes at least two layers of the plate-shaped busbars, each busbar being stacked overlapping each other in the thickness direction, and the first busbar structure has a welded portion extending in the thickness direction to weld the busbars together.

[0019] In one embodiment of the invention, the branch portion includes the entirety of the welded portion, and the welded portion, when viewed from above, is formed by a surrounding line enclosed by two lines opposed to each other in a direction parallel to the long side direction of the first busbar structure and two lines opposed to each other in a direction different from the long side direction of the first busbar structure.

[0020] In one embodiment of the present invention, the shape of the second busbar structure is L-shaped or T-shaped when viewed from above.

[0021] In one embodiment of the invention, in the second busbar structure, the width of the portion extending from the branch portion in a direction different from the long side direction relative to the first busbar structure is different from the width of the overlapping portion.

[0022] In one embodiment of the invention, the branch portion further includes other weld portions that are different from the weld portion formed by multiple lines parallel to the long side direction of the first busbar structure when viewed from above.

[0023] In one embodiment of the invention, the branch portion includes a portion of the welded portion, and the branch portion includes a welded portion formed by multiple lines in a direction different from the long side direction of the first busbar structure.

[0024] In one embodiment of the invention, the branch portion includes a portion of the welded portion, and the branch portion includes a welded portion formed by a surrounding line when viewed from above, consisting of two lines opposed to each other in a direction parallel to the long side direction of the first busbar structure and two lines opposed to each other in a direction different from the long side direction of the first busbar structure.

[0025] In one embodiment of the invention, the second busbar structure has the overlapping portion relative to the branch portion only on one side of the long side of the first busbar structure.

[0026] Invention Effects

[0027] According to an embodiment of the busbar laminate of the present invention, it comprises: a first busbar structure including at least one plate-shaped busbar having a predetermined width and extending along its long side; and a second busbar structure disposed on the first busbar structure, having a branching structure extending in a direction different from the long side direction of the first busbar structure via a branch portion, the second busbar structure having an overlapping portion that causes the first busbar structure and the second busbar structure to overlap each other in the thickness direction, the overlapping portion having a predetermined width and extending parallel to the long side direction of the first busbar structure, the overlapping portion having a welding portion extending in the thickness direction to weld the first busbar structure and the second busbar structure together, and the branching portion including a part or the entirety of the welding portion. Thus, a busbar laminate with a branching structure having a more robust connection at the branching points than before and whose branching direction can be determined by the busbar itself can be provided. Furthermore, since there are no creases at the branching points, cracking and breakage at the branching points can be prevented.

[0028] According to one embodiment of the busbar laminate of the present invention, the branch portion includes a portion of the welded portion, and the welded portion is formed by multiple lines parallel to the long side direction of the first busbar structure when viewed from above. Thus, the formation of the welded portion becomes easier and the connection strength between the first busbar structure and the second busbar structure can be improved.

[0029] According to one embodiment of the busbar stack of the present invention, in the second busbar structure, the overlapping portion and the branch portion are integrally formed on the same busbar, thereby enabling easy design of the branch structure.

[0030] According to one embodiment of the busbar laminate of the present invention, in the second busbar structure, the busbar having the branch portion is formed separately. The busbar having the branch portion extends in a direction different from the long side direction relative to the long side direction of the first busbar structure. Therefore, the busbar having the overlapping portion and the busbar having the branch portion can be designed as different components according to the intended use. Furthermore, the width of the busbar having the branch portion can be appropriately designed according to the intended use.

[0031] According to one embodiment of the busbar laminate of the present invention, the first busbar structure includes at least two layers of the plate-shaped busbars, each busbar being stacked overlapping each other in the thickness direction, and the first busbar structure has a welded portion extending in the thickness direction to weld each busbar to the other, thereby improving the connection strength between the busbars and enabling the thickening of the busbar laminate.

[0032] According to one embodiment of the busbar laminate of the present invention, the branch portion includes the entire welded portion, and the welded portion, when viewed from above, is formed by a surrounding line surrounded by two lines opposing each other in a direction parallel to the long side direction of the first busbar structure and two lines opposing each other in a direction different from the long side direction of the first busbar structure, thereby further improving the connection strength of the branch portion.

[0033] According to one embodiment of the busbar laminate of the present invention, the shape of the second busbar structure is approximately L-shaped or approximately T-shaped when viewed from above, thereby making it easy to design right-angled branching directions. Furthermore, the shape of the second busbar structure is T-shaped when viewed from above, so that the overlapping portion of the second busbar structure is formed on the entire surface of the first busbar structure, thus providing a busbar laminate with a branching structure having a flat surface throughout.

[0034] According to one embodiment of the busbar stack of the present invention, in the second busbar structure, the width of the portion extending from the branch in a direction different from the long side direction relative to the long side direction of the first busbar structure is different from the width of the overlapping portion, thereby allowing the magnitude of the current flowing in the portion extending from the branch in a direction different from the long side direction to be appropriately designed according to the intended use.

[0035] According to one embodiment of the busbar laminate of the present invention, the second busbar structure has the overlapping portion relative to the branch portion only on one side of the long side of the first busbar structure, thereby reducing the cross-sectional area of ​​the busbar laminate by means of the branch portion and reducing (optimizing) the material according to the current capacity. Attached Figure Description

[0036] Figure 1 This is a schematic perspective view of the busbar stack according to the first embodiment of the present invention.

[0037] Figure 2 This is a schematic perspective view of the busbar stack according to the second embodiment of the present invention.

[0038] Figure 3 This is a schematic perspective view of the busbar stack according to the third embodiment of the present invention.

[0039] Figure 4 This is a schematic perspective view of the busbar stack according to the fourth embodiment of the present invention.

[0040] Figure 5 This is a schematic perspective view of the busbar stack according to the fifth embodiment of the present invention.

[0041] Figure 6 This is a schematic perspective view of the busbar stack according to the sixth embodiment of the present invention.

[0042] Figure 7 This is a schematic perspective view of the busbar stack according to the seventh embodiment of the present invention.

[0043] Figure 8 This is a schematic perspective view of the busbar stack according to the eighth embodiment of the present invention.

[0044] Figure 9 This is a schematic perspective view of the busbar stack according to the ninth embodiment of the present invention. Detailed Implementation

[0045] The busbar laminates of various embodiments of the present invention will be described below. Furthermore, Figures 1-9 This is a schematic perspective view of the busbar stack according to the first to ninth embodiments of the present invention.

[0046] <First Implementation Method>

[0047] like Figure 1 As shown, the busbar stack 10 of the first embodiment includes: a first busbar structure 11, which includes at least one plate-shaped busbar having a predetermined width W1 and extending along its long side; and a second busbar structure 12 disposed on the first busbar structure 11, having a branch structure that extends perpendicularly to the long side direction of the first busbar structure 11 via a branch portion R1 in a direction different from the long side direction of the first busbar structure 11 with a predetermined width W2B. More specifically, the first busbar structure 11 includes at least two plate-shaped busbars, and as plate-shaped busbars, it has a double-layer structure formed by the first busbar 11a and the second busbar 11b overlapping each other in the thickness direction.

[0048] (First busbar structure)

[0049] In the first busbar structure 11, both the first busbar 11a and the second busbar 11b have the same width W1 and are plate-shaped components with both long side and short side (width direction) when viewed from above. In addition, both the first busbar 11a and the second busbar 11b have the same plate thickness.

[0050] The long side direction of the first busbar 11a is the energizing direction of the first busbar 11a. The long side direction of the second busbar 11b is the energizing direction of the second busbar 11b. That is, the long side direction of the first busbar structure 11 corresponds to the long side direction of the first busbar 11a and the second busbar 11b, respectively.

[0051] The first busbar structure 11 has a welded portion L1 extending along the thickness direction to weld the busbars (i.e., the first busbar 11a and the second busbar 11b) together. The welded portion L1 is formed by multiple lines parallel to the long side direction of the first busbar structure 11 when viewed from above.

[0052] (Second busbar structure)

[0053] The second busbar structure 12 has an overlapping portion 13 that overlaps the first busbar structure 11 and the second busbar structure 12 in the thickness direction. This overlapping portion 13 has a predetermined width W2A and extends parallel to the long side direction of the first busbar structure 11. That is, the overlapping portion 13 has a three-layer structure in which the second busbar structure 12, the first busbar 11a, and the second busbar 11b overlap and are stacked. In the second busbar structure 12, the overlapping portion 13 and the branch portion R1 are integrally formed on the same busbar (one busbar), and the overlapping portion 13 and the branch portion R1 have a branching structure disposed on the same surface. Furthermore, the shape of the second busbar structure 12 is approximately L-shaped when viewed from above, and the second busbar structure 12 is also energized in a direction that branches perpendicularly to the long side direction of the overlapping portion 13 via the branch portion R1.

[0054] The overlapping portion 13 has a welded portion L1 extending along the thickness direction to weld the first busbar structure 11 and the second busbar structure 12 together. The branch portion R1 includes a portion of the welded portion L1, which, when viewed from above, is formed by multiple lines parallel to the long side direction of the first busbar structure 11. That is, in the busbar laminate 10, in the first busbar structure 11 in the region without the overlapping portion 13 and in the first busbar structure 11 and the second busbar structure 12 in the region with the overlapping portion 13, linear welded portions L1 are formed along the long side direction of the first busbar structure 11 on the same straight line.

[0055] The width W1 of the first busbar structure 11 is the same as the width W2A of the overlapping portion 13. Therefore, the busbar stack 10 has a stacked structure in which the overlapping portions 13 of the first busbar structure 11 and the second busbar structure 12 overlap with the same width.

[0056] The welded part L1 can be formed, for example, by laser welding or by oscillating welding. The materials used for the first busbar 11a, the second busbar 11b, and the second busbar structure 12 can be, for example, copper or copper alloys such as copper, oxygen-free copper, and brass, or aluminum alloys such as 6000 series aluminum.

[0057] As described above, in the busbar laminate 10, the overlapping portion 13 has a welding portion L1 extending in the thickness direction to weld the first busbar structure 11 and the second busbar structure 12 together, and the branch portion R1 includes a portion of the welding portion L1, thus improving the connection strength of the branch portion R1. Furthermore, the first busbar structure 11 includes two plate-shaped layers: a first busbar 11a and a second busbar 11b. The first busbar 11a and the second busbar 11b are stacked overlapping each other in the thickness direction. The first busbar structure 11 has a welding portion L1 extending in the thickness direction to weld the first busbar 11a and the second busbar 11b together, thus improving the connection strength between the first busbar 11a and the second busbar 11b, and enabling the busbar laminate 10 to achieve a thicker wall.

[0058] Furthermore, in the busbar laminate 10, in the first busbar structure 11 in the region without the overlapping portion 13 and in the first busbar structure 11 and the second busbar structure 12 in the region with the overlapping portion 13, a linear weld portion L1 is continuously formed along the long side direction of the first busbar structure 11 on the same straight line. Therefore, the weld portion L1 can be easily formed, and not only can the connection strength between the first busbar 11a and the second busbar 11b be improved, but also the connection strength between the first busbar structure 11 and the second busbar structure 12 can be improved.

[0059] Furthermore, in the busbar laminate 10, in the second busbar structure 12, the overlapping portion 13 and the branch portion R1 are integrally formed on the same busbar. The shape of the second busbar structure 12 is approximately L-shaped when viewed from above, thus providing a busbar structure with a branch structure that allows for easy design of branch directions. In addition, in the busbar laminate 10, the weld portion L1 is formed by laser welding multiple linear wires, thus suppressing the generation of voids in the weld portion L1, and improving the electrical connectivity and connection strength between the first busbar 11a and the second busbar 11b, and between the first busbar structure 11 and the second busbar structure 12.

[0060] In the second busbar structure 12, the width W2B of the portion extending perpendicularly to the branch R1 relative to the long side direction of the first busbar structure 11 can be the same as or different from the width W2A of the overlapping portion 13. By making the width W2B different from the width W2A, the magnitude of the current flowing in the portion extending in a direction different from the long side direction of the first busbar structure 11 via the branch R1 can be appropriately designed according to the application purpose in the second busbar structure 12.

[0061] <Second Implementation Method>

[0062] Next, the busbar laminate according to the second embodiment of the present invention will be described. In the busbar laminate of the first embodiment, the overlapping portion and the branch portion are integrally formed on the same busbar in the second busbar structure. However, instead, in the busbar laminate of the second embodiment, the busbar having the branch portion is formed separately in the second busbar structure. Furthermore, in Figure 2 In the middle, to and Figure 1 The common components of the busbar stack shown in the first embodiment are labeled with the same reference numerals and have the same function. Since the common components are the same as those in the first embodiment described above, their description is omitted.

[0063] like Figure 2 As shown, the busbar stack 20 of the second embodiment includes: a first busbar structure 11 with a double-layer structure, which includes a first busbar 11a and a second busbar 11b; and a second busbar structure 12, which is disposed on the first busbar structure 11 and has a branch structure that extends perpendicularly to the long side direction of the first busbar structure 11 via a branch portion R2 in a direction different from the long side direction of the first busbar structure 11 with a predetermined width W4B.

[0064] In the second busbar structure 12, a plate-shaped third busbar 12a without a branch portion R2 and a plate-shaped fourth busbar 12b with a branch portion R2 are formed separately. A portion of the side of the fourth busbar 12b having a long side parallel to the long side direction is connected to the side of the third busbar 12a having a long side parallel to the short side direction (width direction), thereby ensuring power supply between the third busbar 12a and the fourth busbar 12b. The second busbar structure 12 has a branching structure that connects the plate-shaped third busbar 12a without a branch portion R2 and the fourth busbar 12b with a branch portion R2, which is different from the third busbar 12a, to each other. The shape of the second busbar structure 12 is approximately L-shaped when viewed from above. The second busbar structure 12 is powered in both the long side direction of the third busbar 12a and the long side direction of the fourth busbar 12b.

[0065] The first busbar structure 11 has a welded portion L2 extending in the thickness direction to weld the first busbar 11a and the second busbar 11b together. The second busbar structure 12 also has a welded portion L2 extending in the thickness direction to weld the first busbar structure 11 and the second busbar structure 12 together. The branch portion R2 includes a portion of the welded portion L2, which, when viewed from above, is formed by multiple lines parallel to the long side direction of the first busbar structure 11. That is, in the busbar stack 20, multiple linear welded portions L2 are formed on the same straight line from one end of the long side direction of the third busbar 12a (the side that does not contact the fourth busbar 12b) to one end of the first busbar structure 11 that does not overlap with the second busbar structure 12 (the side that does not contact the fourth busbar 12b).

[0066] Materials used for the third busbar 12a and the fourth busbar 12b include, for example, copper or copper alloys such as ductile copper, oxygen-free copper, and brass, and aluminum alloys such as 6000 series aluminum.

[0067] As described above, in the busbar stack 20, in the second busbar structure 12, the plate-shaped third busbar 12a without the branch portion R2 and the plate-shaped fourth busbar 12b with the branch portion R2 are formed separately. The fourth busbar 12b extends from the long side direction of the third busbar 12a via the branch portion R2 in a direction different from the long side direction of the first busbar structure 11. Therefore, the third busbar 12a and the fourth busbar 12b can be designed as different components according to the intended use. In addition, the width W4B of the fourth busbar 12b can be appropriately designed according to the intended use, and the width W4A of the third busbar 12a and the width W4B of the fourth busbar 12b extending along the branch direction of the second busbar structure 12 can be designed to be different widths.

[0068] <Third Implementation Method>

[0069] Next, the busbar laminate according to the third embodiment of the present invention will be described. In the busbar laminates of the first and second embodiments, the branch portion includes a portion of the welded portion, which is formed by multiple lines parallel to the long side direction of the first busbar structure when viewed from above. However, instead, in the busbar laminate of the third embodiment, the branch portion includes the entire welded portion, which is formed by an enclosing line when viewed from above. Furthermore, in Figure 3 In the middle, to and Figure 1 The common components of the busbar stack shown in the first embodiment are labeled with the same reference numerals and have the same function. Since the common components are the same as those in the first embodiment described above, their description is omitted.

[0070] like Figure 3As shown, the busbar stack 30 of the third embodiment includes: a first busbar structure 11 with a double-layer structure, which includes a first busbar 11a and a second busbar 11b; and a second busbar structure 12 disposed on the first busbar structure 11, having a branch structure that extends perpendicularly to the long side direction of the first busbar structure 11 via a branch portion R3 in a direction different from the long side direction of the first busbar structure 11 with a predetermined width.

[0071] In the second busbar structure 12, the branch portion R3 includes the entire welded portion L3. The welded portion L3, when viewed from above, is formed by the perimeter of a quadrilateral enclosed by two lines parallel to the long side direction of the first busbar structure 11 and two lines in the direction extending from the branch structure of the second busbar structure (a direction different from the long side direction of the first busbar structure 11). The second busbar structure 12 has a branch structure where the overlapping portion 13 and the branch portion R3 are disposed on the same surface. The shape of the second busbar structure 12 is approximately L-shaped when viewed from above. The second busbar structure 12 is also energized in a direction that branches perpendicularly to the long side direction of the overlapping portion 13 via the branch portion R3.

[0072] In the busbar laminate 30, the welded portion L3 can be formed, for example, by laser welding or by oscillating welding.

[0073] As described above, in the busbar laminate 30, the welded portion L3 is formed in the branch portion R3 which is disposed on the same surface as the overlapping portion 13 of the first busbar structure 11 and the second busbar structure 12, thereby improving the connection strength of the branch portion R3.

[0074] <Fourth Implementation Method>

[0075] Next, the busbar laminate according to the fourth embodiment of the present invention will be described. In the busbar laminate of the first embodiment, in the first busbar structure in the region without overlap and in the first and second busbar structures in the region with overlap, the linear weld portions are formed only along the long side direction of the first busbar structure on the same straight line. However, in the busbar laminate of the fourth embodiment, the branch portion also includes a weld portion formed by a surrounding line surrounded by two lines opposing each other parallel to the long side direction of the first busbar structure and two lines opposing each other in a direction different from the long side direction of the first busbar structure when viewed from above. Furthermore, in Figure 4 In the middle, to and Figure 1 The common components of the busbar stack shown in the first embodiment are labeled with the same reference numerals and have the same function. Since the common components are the same as those in the first embodiment described above, their description is omitted.

[0076] like Figure 4 As shown, the busbar stack 40 of the fourth embodiment includes: a first busbar structure 11 with a double-layer structure, which includes a first busbar 11a and a second busbar 11b; and a second busbar structure 12 disposed on the first busbar structure 11, having a branch structure that extends vertically through a branch portion R4 with a predetermined width relative to the long side direction of the first busbar structure 11.

[0077] In the busbar stack 40, in the first busbar structure 11 where the overlapping portion 13 is not present and the second busbar structure 12 where the overlapping portion 13 is present, a linear welded portion L4a is formed along the long side direction of the first busbar structure 11 in a straight line. Additionally, the branch portion R4 includes other welded portions L4b, which, when viewed from above, are formed by multiple lines parallel to the long side direction of the first busbar structure 11, and are different from the welded portion L4a. The welded portion L4b, when viewed from above, is formed by an enclosing line enclosed by two lines parallel to the long side direction of the first busbar structure 11 and two lines in a direction different from the long side direction of the first busbar structure 11.

[0078] The second busbar structure 12 has a branching structure where an overlapping portion 13 and a branch portion R4 are disposed on the same surface. The shape of the second busbar structure 12, when viewed from above, is approximately I-shaped relative to the first busbar structure 11. That is, in the second busbar structure 12, the long side direction of the overlapping portion 13 corresponds to the direction (branching direction) of the branching portion R5 branching into a direction different from the long side direction of the first busbar structure 11. The second busbar structure 12 is also energized in the branching direction.

[0079] <Fifth Implementation Method>

[0080] Next, the busbar laminate according to the fifth embodiment of the present invention will be described. In the busbar laminate of the first embodiment, a welded portion formed by multiple lines parallel to the long side direction of the first busbar structure is formed at the branch portion. However, in the busbar laminate of the fifth embodiment, instead, a welded portion formed by multiple lines in a direction different from the long side direction of the first busbar structure is formed at the branch portion. Furthermore, in Figure 5 In the middle, to and Figure 1 The common components of the busbar stack shown in the first embodiment are labeled with the same reference numerals and have the same function. Since the common components are the same as those in the first embodiment described above, their description is omitted.

[0081] like Figure 5As shown, the busbar stack 50 of the fourth embodiment includes: a first busbar structure 11 with a double-layer structure, which includes a first busbar 11a and a second busbar 11b; and a second busbar structure 12 disposed on the first busbar structure 11, having a branch structure that extends perpendicularly to the long side direction of the first busbar structure 11 via a branch portion R5 in a direction different from the long side direction of the first busbar structure 11 with a predetermined width.

[0082] The branch R5 includes a portion of the welded portion. Welded portions L5a and L5b are formed on the first busbar structure 11 and the second busbar structure 12 respectively. When viewed from above, they are formed by multiple lines parallel to the long side direction of the first busbar structure 11. Welded portions L5a and L5b are not continuous with each other, but are formed separately.

[0083] The branch portion R5 of the second busbar structure 12 has a different welded portion L5c from the welded portions L5a and L5b formed by multiple lines parallel to the long side direction of the first busbar structure 11 when viewed from above. The branch portion R5 includes the welded portion L5c formed by multiple lines in a direction different from the long side direction of the first busbar structure 11 (a perpendicular direction). The second busbar structure 12 has a branching structure that sets the overlapping portion 13 and the branch portion R5 on the same surface, and the shape of the second busbar structure 12 is approximately L-shaped when viewed from above. The second busbar structure 12 is also energized in a direction that branches perpendicularly to the long side direction of the overlapping portion 13 via the branch portion R5.

[0084] <Sixth Implementation Method>

[0085] Next, the busbar laminate according to the sixth embodiment of the present invention will be described. In the busbar laminate of the first embodiment, in the first busbar structure in the region without overlap and in the first and second busbar structures in the region with overlap, the linear welded portions are formed only along the long side direction of the first busbar structure on the same straight line. However, in the busbar laminate of the sixth embodiment, the branch portion also includes a welded portion formed by multiple lines in a direction different from the long side direction of the first busbar structure. Furthermore, in Figure 6 In the middle, to and Figure 1 The common components of the busbar stack shown in the first embodiment are labeled with the same reference numerals and have the same function. Since the common components are the same as those in the first embodiment described above, their description is omitted.

[0086] like Figure 6As shown, the busbar stack 60 of the sixth embodiment includes: a first busbar structure 11 with a double-layer structure, which includes a first busbar 11a and a second busbar 11b; and a second busbar structure 12 disposed on the first busbar structure 11, having a branch structure that extends perpendicularly to the long side direction of the first busbar structure 11 via a branch portion R6 in a direction different from the long side direction of the first busbar structure 11 with a predetermined width.

[0087] In the busbar stack 60, in the first busbar structure 11 in the region without the overlapping portion 13 and in the first busbar structure 11 and the second busbar structure 12 in the region with the overlapping portion 13, a linear weld portion L6a is formed along the long side direction of the first busbar structure 11 in a straight line. In addition, the branch portion R6 also includes other weld portions L6b that are different from the weld portions L6a formed by multiple lines parallel to the long side direction of the first busbar structure 11 when viewed from above, and also includes weld portions L6b formed by multiple lines in a direction different from the long side direction of the first busbar structure 11 (a perpendicular direction).

[0088] The second busbar structure 12 has a branching structure that sets the overlapping portion 13 and the branch portion R6 on the same surface, and the shape of the second busbar structure 12 is approximately L-shaped when viewed from above. The second busbar structure 12 is also energized in a direction that branches perpendicularly to the long side of the overlapping portion 13 via the branch portion R6.

[0089] <Seventh Implementation Method>

[0090] Next, the busbar laminate according to the seventh embodiment of the present invention will be described. In the busbar laminate of the second embodiment, the branch portion includes a welded portion formed by multiple lines parallel to the long side direction of the first busbar structure when viewed from above. However, in the busbar laminate of the seventh embodiment, instead, the branch portion also includes a welded portion formed by a surrounding line surrounded by two lines opposing each other parallel to the long side direction of the first busbar structure and two lines opposing each other in a direction different from the long side direction of the first busbar structure when viewed from above. Furthermore, in Figure 7 In the middle, to and Figure 1 The common components of the busbar stack shown in the first embodiment are labeled with the same reference numerals and have the same function. Since the common components are the same as those in the first embodiment described above, their description is omitted.

[0091] like Figure 7As shown, the busbar stack 70 of the fourth embodiment includes: a first busbar structure 11 with a double-layer structure, which includes a first busbar 11a and a second busbar 11b; and a second busbar structure 12 disposed on the first busbar structure 11, having a branch structure that extends perpendicularly to the long side direction of the first busbar structure 11 via a branch portion R7 in a direction different from the long side direction of the first busbar structure 11 with a predetermined width.

[0092] The branch portion R7 includes a portion of the welded portion. In the second busbar structure 12, the plate-shaped third busbar 12a without the branch portion R7 and the plate-shaped fourth busbar 12b with the branch portion R7 are formed separately. The second busbar structure 12 has a branch structure that connects the plate-shaped third busbar 12a without the branch portion R7 and the fourth busbar 12b with the branch portion R7, which is different from the third busbar 12a, to each other. The shape of the second busbar structure 12 is approximately L-shaped when viewed from above. The second busbar structure 12 is energized in both the long side direction of the third busbar 12a and the long side direction of the fourth busbar 12b.

[0093] The first busbar structure 11 and the second busbar structure 12 each have welded portions L7a and L7b, which, when viewed from above, are formed by multiple lines parallel to the long side direction of the first busbar structure 11. The welded portions L7a and L7b are discontinuous and are formed separately. In addition, the welded portion L7a is also formed separately from each other.

[0094] A branch R7 of the second busbar structure 12 has a different welded portion L7c from the welded portions L7a and L7b formed by multiple lines parallel to the long side direction of the first busbar structure 11 when viewed from above. The branch R7 includes a welded portion L5c formed by multiple lines in a direction different from the long side direction of the first busbar structure 11 (a perpendicular direction). The welded portion L7c, when viewed from above, is formed by an enclosing line surrounded by two lines parallel to the long side direction of the first busbar structure 11 and two lines in a direction different from the long side direction of the first busbar structure 11.

[0095] <Eighth Implementation Method>

[0096] Next, the busbar laminate according to the eighth embodiment of the present invention will be described. In the busbar laminate of the second embodiment, in the first busbar structure in the region without overlap and in the first and second busbar structures in the region with overlap, the linear weld portions are formed only along the long side direction of the first busbar structure on the same straight line. However, in the busbar laminate of the eighth embodiment, the branch portion also includes a weld portion formed by a surrounding line surrounded by two lines opposing each other parallel to the long side direction of the first busbar structure and two lines opposing each other in a direction different from the long side direction of the first busbar structure when viewed from above. Furthermore, in Figure 8 In the middle, to and Figure 1 The common components of the busbar stack shown in the first embodiment are labeled with the same reference numerals and have the same function. Since the common components are the same as those in the first embodiment described above, their description is omitted.

[0097] like Figure 8 As shown, the busbar stack 80 of the eighth embodiment includes: a first busbar structure 11 with a double-layer structure, which includes a first busbar 11a and a second busbar 11b; and a second busbar structure 12 disposed on the first busbar structure 11, having a branch structure that extends perpendicularly to the long side direction of the first busbar structure 11 via a branch portion R4 in a direction different from the long side direction of the first busbar structure 11 with a predetermined width.

[0098] In the second busbar structure 12, a plate-shaped third busbar 12a without branch portions R8 and a plate-shaped fourth busbar 12b with branch portions R8 are formed separately. The second busbar structure 12 has a branching structure that connects the plate-shaped third busbar 12a without branch portions R8 and the fourth busbar 12b with branch portions R8, which is different from the third busbar 12a. The shape of the second busbar structure 12 is approximately L-shaped when viewed from above. The second busbar structure 12 is energized in both the long side direction of the third busbar 12a and the long side direction of the fourth busbar 12b.

[0099] In the busbar stack 80, in the first busbar structure 11 where the overlapping portion 13 is not present and the second busbar structure 12 where the overlapping portion 13 is present, a linear weld portion L8a is formed along the long side direction of the first busbar structure 11 in a straight line. Additionally, the branch portion R8 also includes a different weld portion L8b, which is formed by multiple lines parallel to the long side direction of the first busbar structure 11 when viewed from above. The weld portion L8b, when viewed from above, is formed by an enclosing line enclosed by two lines parallel to the long side direction of the first busbar structure 11 and two lines in a direction different from the long side direction of the first busbar structure 11.

[0100] <Ninth Implementation Method>

[0101] Next, the busbar laminate according to the ninth embodiment of the present invention will be described. In the busbar laminates of the first to third and fifth to eighth embodiments, the shape of the second busbar structure is approximately L-shaped when viewed from above; however, in the busbar laminate of the ninth embodiment, the shape of the second busbar structure is approximately T-shaped when viewed from above. Furthermore, in Figure 9 In the middle, to and Figure 1 The common components of the busbar stack shown in the first embodiment are labeled with the same reference numerals and have the same function. Since the common components are the same as those in the first embodiment described above, their description is omitted.

[0102] like Figure 9 As shown, the busbar stack 90 of the ninth embodiment includes: a first busbar structure 11 with a double-layer structure, which includes a first busbar 11a and a second busbar 11b; and a second busbar structure 12 disposed on the first busbar structure 11, having a branch structure that extends perpendicularly to the long side direction of the first busbar structure 11 via a branch portion R4 in a direction different from the long side direction of the first busbar structure 11 with a predetermined width.

[0103] The second busbar structure 12 has a branching structure that sets the overlapping portion 13 and the branching portion R9 on the same surface, and the shape of the second busbar structure 12 is approximately T-shaped when viewed from above. Thus, the overlapping portion 13 of the second busbar structure 12 is formed on the entire surface of the first busbar structure 11, thereby providing a busbar laminate with a branching structure that is flat across the entire surface.

[0104] In addition, in the busbar laminate 90, the welded portion (not shown) can also be formed in the same way as in other embodiments, and the branch portion R9 can include part or all of the welded portion.

[0105] Next, other embodiments of the busbar structure of the present invention will be described. In the busbar structures of the above embodiments, the first busbar structure is a double-layer structure including a first busbar and a second busbar, but it can also be a single-layer structure with only a first busbar.

[0106] In addition, the first busbar, the second busbar, and the second busbar structure (including the third busbar and the fourth busbar) can also be plated after being made of the above-mentioned materials.

[0107] Furthermore, in the busbar structure described above, if it includes a plurality of linear welded portions that are parallel to the long side direction of the first busbar structure when viewed from above, the linear welded portions are formed by two lines that are parallel to the long side direction of the first busbar structure when viewed from above. However, they may also be formed by one line or three or more lines instead.

[0108] In addition, in the busbar structure of the third, fourth, seventh and eighth embodiments, the branch includes a welded part L formed by the surrounding line of a quadrilateral when viewed from above, but it can also be formed by various surrounding lines such as circles, ellipses, trapezoids, polygons, etc. when viewed from above.

[0109] Furthermore, in the above-described embodiments, the direction in which the branch structure of the second busbar structure extends is perpendicular to the long side direction of the first busbar structure. However, the direction in which the branch structure of the second busbar structure extends is not limited to perpendicular, and can be set to any direction different from the long side direction of the first busbar structure.

[0110] [Industrial Applicability]

[0111] The busbar stack of the present invention has a branching structure in which the branching points are more firmly connected than ever before and the branching direction can be determined by the busbar itself. Therefore, it is effective, for example, for applications such as branching connections of automotive wiring harnesses to various electrical components.

[0112] Label Explanation

[0113] 10, 20, 30, 40, 50, 60, 70, 80, 90: Busbar stack; 11: First busbar structure; 12: Second busbar structure; 11a: First busbar; 11b: Second busbar; 12a: Third busbar; 12b: Fourth busbar; 13: Overlapping portion.

Claims

1. A busbar laminate, comprising: A first busbar structure includes at least one plate-shaped busbar having a defined width and extending along its long side; and A second busbar structure, disposed on the first busbar structure, has a branch structure that extends via a branch portion in a direction different from the long side direction relative to the long side direction of the first busbar structure. Its features are, The second busbar structure has an overlapping portion that causes the first busbar structure and the second busbar structure to overlap each other in the thickness direction. The overlapping portion has a predetermined width and extends parallel to the long side direction of the first busbar structure. The overlapping portion has a welded portion extending along the thickness direction to allow the first busbar structure and the second busbar structure to be welded together, and, The branch includes a portion or the entirety of the welded portion.

2. The busbar laminate according to claim 1, wherein, The branch includes a portion of the welded portion, and, The welded portion, when viewed from above, is formed by multiple lines parallel to the long side direction of the first busbar structure.

3. The busbar laminate according to claim 1 or 2, wherein, In the second busbar structure, the overlapping portion and the branch portion are integrally formed on the same busbar.

4. The busbar laminate according to claim 1 or 2, wherein, In the second busbar structure, the busbar with the branch is formed separately, and the busbar with the branch extends in a direction different from the long side direction relative to the long side direction of the first busbar structure.

5. The busbar laminate according to claim 1 or 2, wherein, The first busbar structure includes at least two layers of the plate-shaped busbars. The busbars are stacked overlapping each other in the thickness direction, and, The first busbar structure has a welded portion extending along the thickness direction so that the busbars can be welded together.

6. The busbar laminate according to claim 1, wherein, The branch includes the entirety of the welded portion, and, The welded portion, when viewed from above, is formed by a surrounding line consisting of two lines that are parallel to the long side direction of the first busbar structure and two lines that are opposite to the long side direction of the first busbar structure.

7. The busbar laminate according to claim 1 or 2, wherein, The second busbar structure is roughly L-shaped or roughly T-shaped when viewed from above.

8. The busbar laminate according to claim 1 or 2, wherein, In the second busbar structure, the width of the portion extending from the branch in a direction different from the long side direction relative to the first busbar structure is different from the width of the overlapping portion.

9. The busbar laminate according to claim 2, wherein, The branch also includes other welded portions that are different from the welded portions formed by multiple lines parallel to the long side direction of the first busbar structure when viewed from above.

10. The busbar laminate according to claim 1, wherein, The branch includes a portion of the welded portion, and, The branch includes a welded portion formed by multiple lines in a direction different from the long side direction of the first busbar structure.

11. The busbar laminate according to claim 1, wherein, The branch includes a portion of the welded portion, and, The branch includes a welded portion formed by a surrounding line when viewed from above, consisting of two lines opposed to each other in a direction parallel to the long side of the first busbar structure and two lines opposed to each other in a direction different from the long side of the first busbar structure.

12. The busbar laminate according to claim 1 or 2, wherein, The second busbar structure has the overlapping portion relative to the branch portion only on one side of the long side of the first busbar structure.

Images