Bus bar connection structure and bus bar

Abstract

In this bus bar connection structure, a bus bar has a flat-plate-shaped joining region, and is connected via a screw connection mechanism in a state in which the joining region is joined to a mounting surface of an electrical member to be connected. A first thermosetting film is interposed between the bonding region and the mounting surface. Preferably, the first thermosetting film has electrical conductivity and is bonded to the bonding region in advance. Preferably, a second thermosetting film is interposed between the head of the fastening member and the joining region. Preferably, the second thermosetting film has electrical conductivity and is bonded to the bonding region in advance.

Description

Technical Field

[0001] This invention relates to a busbar connection structure formed by connecting a busbar to an electrical component, and to a busbar connected to an electrical component. Background Technology

[0002] Busbars, which connect the first and second electrical components such as batteries, are widely used in various fields.

[0003] It is desirable for the busbar to minimize the resistance between the first and second electrical components. To achieve this, it is necessary to stabilize the connection between the busbar and the first and second components.

[0004] Typically, the busbar is connected to the corresponding electrical component via a threaded connection mechanism (Patent Documents 1 and 2).

[0005] In a configuration where the busbar is connected to the electrical component via the threaded connection mechanism, if the busbar is used as a component for electrically connecting batteries in a vehicle battery, or in an environment subject to vibration and / or shock, the threaded connection mechanism may become loose, and the connection stability between the busbar and the electrical component may be compromised.

[0006] Existing technical documents

[0007] Patent documents

[0008] Patent Document 1: Japanese Patent Application Publication No. 2013-062045

[0009] Patent Document 2: Japanese Patent Application Publication No. 2017-033694 Summary of the Invention

[0010] The present invention was made in view of the above-mentioned prior art. The first objective is to provide a busbar connection structure in which the busbar is connected to an electrical component via a threaded connection mechanism, which can effectively prevent or reduce the occurrence of loosening in the threaded connection mechanism during use.

[0011] Furthermore, a second objective of the present invention is to provide a busbar that is connected to an electrical component via a threaded connection mechanism, which can effectively prevent or reduce the occurrence of loosening in the threaded connection mechanism during use.

[0012] To achieve the first objective, the first aspect of the present invention provides a busbar connection structure, which is a busbar connection structure formed by electrically and mechanically connecting a conductive busbar to an electrical component. The busbar has a flat plate-shaped engagement area and is connected to the electrical component via a threaded connection mechanism when the engagement area is engaged with the mounting surface of the electrical component. A first thermosetting film is interposed between the engagement area and the mounting surface.

[0013] According to the first embodiment of the present invention, the busbar connection structure can effectively prevent or reduce the loosening of the threaded connection mechanism that connects the busbar to the electrical components due to vibration, impact, etc. during use.

[0014] In a first embodiment where the electrical component is configured such that the mounting surface functions as an electrical connection portion, the threaded connection mechanism includes: a fastening connection member having a shaft portion with threads formed on its outer peripheral surface to function as a threaded portion, and a head provided at one end of the shaft portion; and a threaded hole provided on the mounting surface for the shaft portion to be screwed into.

[0015] In the joint area, a snap-fit ​​portion consisting of an opening or gap is provided, through which the shaft portion is inserted but the head portion is not inserted. The first thermosetting film is conductive and configured to allow the shaft portion to be inserted.

[0016] In the first embodiment, it is preferable that a second thermosetting film is interposed between the head and the engagement region. The second thermosetting film is configured to allow the shaft portion to pass through.

[0017] Preferably, the second thermosetting film is bonded to the bonding area.

[0018] In a second embodiment where the electrical component comprises a main body having the mounting surface and a rod-shaped electrode terminal extending outward from the mounting surface and functioning as an electrical connection portion, the threaded connection mechanism has a threaded portion formed on the outer peripheral surface of the electrode terminal and a nut portion screwed into the threaded portion.

[0019] In the engagement area, a snap-fit ​​portion is provided for the electrode terminal to be inserted through, but the nut portion is not inserted through.

[0020] In the second embodiment, it is preferable that a conductive second thermosetting film is interposed between the nut portion and the engagement area. The second thermosetting film is configured to allow the electrode terminals to pass through.

[0021] Preferably, the second thermosetting film is bonded to the bonding area.

[0022] In various configurations of the first embodiment, it is preferred that the first thermosetting film is bonded to the bonding region.

[0023] To achieve the first objective, a second aspect of the present invention provides a busbar connection structure, which is a busbar connection structure formed by electrically and mechanically connecting a conductive busbar to an electrical component. The busbar has a flat joint area and is connected to the electrical component via a threaded connection mechanism when the joint area is engaged with the mounting surface of the electrical component. The threaded connection mechanism has: a fastening connection member having a threaded shaft portion and a head provided at one end of the shaft portion; and a threaded hole provided on the mounting surface for screwing the shaft portion in. In the joint area, a locking portion is provided for insertion of the shaft portion but not of the head portion. A thermosetting film is interposed between the head portion and the joint area, and the thermosetting film is configured to allow the shaft portion to be inserted.

[0024] According to the second aspect of the present invention, the busbar connection structure can effectively prevent or reduce the loosening of the threaded connection mechanism that connects the busbar to the electrical components due to vibration, impact, etc. during use.

[0025] In the second embodiment, preferably, the thermosetting film is bonded to the bonding area.

[0026] Furthermore, to achieve the second objective, a third aspect of the present invention provides a busbar that is electrically and mechanically connected to an electrical component via a threaded connection mechanism. The busbar has: a flat engagement region that engages with the mounting surface of the electrical component in a connected state; a snap-in portion formed in the engagement region such that a threaded portion, which is part of the threaded connection mechanism, can be inserted through it; and a first thermosetting film that is adhered to the opposing surface of the engagement region facing the mounting surface.

[0027] According to the third aspect of the present invention, the busbar can effectively prevent or reduce the loosening of the threaded connection mechanism connecting the busbar to the electrical components due to vibration, impact, etc. during use.

[0028] Preferably, the first thermosetting film is conductive.

[0029] Preferably, the busbar of the third aspect of the present invention has a second thermosetting film, which is bonded to the surface of the bonding region on the side opposite to the opposing surface. Attached Figure Description

[0030] Figure 1This is a front view of a busbar assembly that uses the busbar connection structure of Embodiment 1 of the present invention.

[0031] Figure 2 yes Figure 1 The top view of the busbar assembly shown.

[0032] Figure 3 yes Figure 1 and Figure 2 The diagram shows a perspective view of the busbar assembly.

[0033] Figure 4 yes Figures 1-3 The exploded perspective view of the busbar assembly shown.

[0034] Figure 5 It is along Figure 2 A cross-sectional view of the VV line.

[0035] Figure 6 (a) ~ Figure 6 (f) is an explanatory diagram of an embodiment of the busbar connection structure of Embodiment 1.

[0036] Figure 7 This is a graph showing the verification results for the embodiment regarding the loosening torque required to release the fastening connection.

[0037] Figure 8 This is a graph showing the verification results for a comparative example regarding the loosening torque required to release the fastening connection.

[0038] Figure 9 This is an exploded perspective view of a busbar assembly using the busbar connection structure of Embodiment 2 of the present invention. Detailed Implementation

[0039] Implementation Method 1

[0040] Hereinafter, an embodiment of the busbar connection structure of the present invention will be described with reference to the accompanying drawings.

[0041] exist Figures 1-4 The diagram shows a front view, a top view, a perspective view, and an exploded perspective view of a busbar assembly 1 that uses the busbar connection structure of this embodiment.

[0042] In addition, Figure 5 The middle shows along Figure 2 A partial cross-sectional view of the busbar assembly 1 of the VV line.

[0043] The busbar connection structure is a busbar connection structure that electrically and mechanically connects the conductive busbar 10 to the corresponding electrical components.

[0044] like Figures 1-4 As shown, the busbar assembly 1 using the busbar connection structure of this embodiment includes a busbar 10, and a first electrical component 50 (1) and a second electrical component 50 (2) such as a battery electrically connected through the busbar 10.

[0045] The first and second electrical components 50(1) and 50(2) are substantially the same in configuration.

[0046] Therefore, the constituent parts of the first and second electrical components 50(1) and 50(2) are labeled with the same reference numerals, and the description of the second electrical component 50(2) is omitted as appropriate.

[0047] like Figure 4 As shown, the first electrical component 50 (1) has a body 60 having a mounting surface 62.

[0048] In this embodiment, the first electrical component 50 (1) is configured such that the mounting surface 62 also functions as an electrical connection part that is electrically connected to the busbar 10.

[0049] like Figures 1-5 As shown, the busbar 10 has a flat engagement area 12 and is connected to the first electrical component 50 (1) via a threaded connection mechanism when the engagement area 12 is engaged with the mounting surface 62.

[0050] The busbar 10 is formed of a conductive metal such as Cu.

[0051] In this embodiment, the threaded connection mechanism has: a threaded hole 65 disposed on the mounting surface 62; and a fastening connection member 70 having a shaft portion 72, the shaft portion 72 being provided with a threaded portion that is screwed into the threaded hole 65.

[0052] In addition to the shaft portion 72, the fastening connection member 70 also has a head 75 that expands from the shaft portion 72.

[0053] In this embodiment, the fastening connecting member 70 integrally has a flange portion 77 that is larger in diameter than the head 75 between the head 75 and the shaft portion 72.

[0054] In the engagement area 12 of the busbar 10, there is a locking part 15 through which the shaft 72 is inserted but the head 75 is not inserted.

[0055] like Figure 4 and Figure 5 As shown, in this embodiment, an opening is provided in the engagement area 12 to function as the snap-in portion 15, but a gap may also be provided instead of the opening.

[0056] The busbar connection structure also has a first thermosetting membrane 20 inserted between the joint region 12 and the mounting surface 62.

[0057] like Figure 4 and Figure 5 As shown, in this embodiment, the first thermosetting film 20 is provided with a first film-side locking part 22 through which the shaft part 72 is inserted but the head 75 is not inserted.

[0058] In this embodiment, the first membrane-side insert 22 is formed by an opening, but it can also be formed by a slit instead of an opening.

[0059] The first thermosetting film 20, which is interposed between the engagement area 12 of the busbar 10 and the mounting surface 62 of the first electrical component 50 (1), will solidify due to the heating of the busbar 10 and the first electrical component 50 (1) caused by the power supply when the busbar 10 is in use (i.e., when current flows between the first electrical component 50 (1) and the busbar 10), thereby firmly securing the fastening connection 70.

[0060] Therefore, even when the busbar 10 is used in situations such as vehicle batteries or under conditions of vibration and / or impact, it can effectively prevent or reduce the occurrence of loosening in the threaded connection mechanism.

[0061] The first thermosetting film 20 can be formed from various thermosetting materials, but in this embodiment, it is configured to be conductive.

[0062] With this configuration, the area of ​​the conductive path between the mounting surface 62, which also functions as an electrical connection, and the junction area 12 of the busbar 10 can be effectively ensured, and the resistance rise between the first electrical component 50 (1) and the busbar 10 can be effectively prevented or reduced.

[0063] Preferably, the first thermosetting film 20 is pre-bonded to the engagement area 12 of the busbar 10 before the operation of connecting the busbar 10 to the corresponding electrical component (e.g., the first electrical component 50 (1)) via the threaded connection mechanism.

[0064] With this configuration, the efficiency of the connection operation of the busbar 10 to the first electrical component 50 (1) can be improved when the first thermosetting membrane 20 is interposed between the mounting surface 62 and the joint area 12.

[0065] like Figure 4 and Figure 5As shown, the busbar connection structure also includes a second thermosetting film 30 inserted between the head 75 (the flange portion 77 in this embodiment) of the fastening connection member 70 and the engagement region 12 of the busbar 10.

[0066] The second thermosetting film 30 is provided with a second film-side locking part 32 through which the shaft part 72 is inserted but the head 75 is not inserted.

[0067] The second membrane-side insert 32 is formed by an opening, but it can also be formed by a slit instead of an opening.

[0068] By providing the second thermosetting film 30, the adhesion of the fastening connection 70 can be further improved by utilizing the curing effect of the second thermosetting film 30 caused by the heating of the busbar 10 and the fastening connection 70 corresponding to the energization.

[0069] The second thermosetting film 30 can be formed from various thermosetting materials, but in this embodiment, it is configured to be conductive.

[0070] With this configuration, the power supply path between the first electrical component 50 (1) and the busbar 10 via the fastening connection member 70 can be effectively ensured.

[0071] Preferably, the second thermosetting film 30 is pre-bonded to the engagement area 12 of the busbar 10 before the operation of connecting the busbar 10 to the corresponding electrical component (e.g., the first electrical component 50 (1)) via the threaded connection mechanism.

[0072] With this configuration, the connection efficiency of the busbar 10 to the first electrical component 50 (1) can be improved when the second thermosetting membrane 30 is inserted between the head 75 and the joint area 12.

[0073] Here, the verification results of one embodiment of the busbar connection structure described in this embodiment will be explained.

[0074] exist Figure 6 The diagram illustrates the busbar connection structure of the embodiment described.

[0075] like Figure 6 As shown in (a), the busbar 10 is made of copper with a length of 40mm × width of 20mm × plate thickness of 3.5mm, and has a snap-in portion (opening) 15 with a diameter of 8mm in the joint area 12 on one end side.

[0076] like Figure 6As shown in (b), a first and a second thermosetting film 20 and 30 are temporarily attached to one side and the other side of the joint area 12 of the busbar 10 in the plate thickness direction.

[0077] In this embodiment, thermosetting conductive adhesive sheets (urethane resin matrix) are used as the first and second thermosetting films 20 and 30.

[0078] In detail, in this embodiment, the thickness of the first and second thermosetting films 20 and 30 is set to 60µm, and the lengths of the first side along the length direction of the busbar and the second side along the width direction are set to 20mm and 20mm, respectively.

[0079] also, Figure 6 In (b), reference numerals 27 and 37 are separators.

[0080] In this embodiment, the thermosetting conductive adhesive sheet (urethane resin matrix) used as the first and second thermosetting films 20 and 30 has spacers 27 and 37 on both sides. Figure 6 (b) shows the state in which the separator on one side of the thickness direction is removed and the thermosetting conductive adhesive sheet (urethane resin matrix) is temporarily attached to the bonding area 12 of the busbar 10.

[0081] The first and second thermosetting films 20 and 30 are respectively formed with openings of 8 mm in diameter, which function as the side inserts 22 and 32 of the first and second films.

[0082] While clamping (with a counterweight of 2.5 kg) the joint area 12 of the busbar 10, to which the first and second thermosetting films 20 and 30 are temporarily attached, a heating plate (not shown) is used to heat the area to 170°C for 3 minutes to bond the first and second thermosetting films 20 and 30 to the joint area of ​​the busbar. Figure 6 (c)).

[0083] The busbar 10 is in the state where the residual separators 27 and 37 at the first and second thermosetting films 20 and 30 have been removed. Figure 6 (d) It is fastened to the mounting surface 57 of the mounting member 55 by fastening connecting member 70. Figure 6 (e)).

[0084] In this embodiment, an M6 flanged bolt is used as the fastening connection member 70.

[0085] Additionally, a threaded hole 58 for screwing in an M6 bolt is formed on the mounting surface 57.

[0086] The busbar 10 is fastened to the mounting member 55 by screwing the fastening connection member 70 (M6 flange bolt) into the threaded hole 58 with a torque of 1 N·m using a digital torque wrench.

[0087] The assembly 1', formed by fastening the busbar 10 to the mounting member 55, is heated in a high-temperature furnace (160°C) for 1 hour to cure the first and second thermosetting films 20 and 30. Figure 6 (f)).

[0088] Prepare 10 components 1' of such embodiments, and use a digital torque wrench to determine the loosening torque required to release the fastening connection of the fastening connection 70 (the M6 ​​flanged bolt) for each of the 10 components 1' of the embodiments.

[0089] exist Figure 7 The results are shown in the figure.

[0090] As a comparative example, an assembly (not shown) consisting of a busbar without the first and second thermosetting membranes 20 and 30 fastened to the mounting member 55 was prepared.

[0091] The fastening torque in the comparative example is set to be the same as the fastening torque in the embodiment.

[0092] Prepare 10 components of such comparative examples, and use a digital torque wrench to determine the loosening torque required to release the fastening connection of the fastening connection member (M6 flanged bolt) for the 10 components of the comparative examples.

[0093] exist Figure 8 The results are shown in the figure.

[0094] from Figure 7 and Figure 8 It is known that the loosening torque in component 1' of the embodiment is greater than the loosening torque in the component of the comparative example.

[0095] This means that, compared with the component of the comparative example, the fastening connection 70 of the component 1' of the embodiment is more securely fastened.

[0096] Implementation Method 2

[0097] Hereinafter, with reference to the accompanying drawings, other embodiments of the busbar connection structure of the present invention will be described.

[0098] exist Figure 9 The figure shows an exploded perspective view of the busbar assembly 2, which uses the busbar connection structure of this embodiment.

[0099] Furthermore, in the figures, components that are identical to those in Embodiment 1 are labeled with the same reference numerals, and their descriptions are omitted as appropriate.

[0100] Compared with the busbar assembly 1, the busbar assembly 2 has first and second electrical components 80(1) and 80(2) in place of the first and second electrical components 50(1) and 50(2).

[0101] In detail, the busbar assembly 2 has the busbar 10, the first and second thermosetting films 20 and 30 bonded to the bonding area 12 of the busbar 10, and the first and second electrical components 80(1) and 80(2) such as a battery electrically connected through the busbar 10.

[0102] The first and second electrical components 80(1) and 80(2) are substantially the same in configuration.

[0103] Therefore, the constituent parts of the first and second electrical components 80(1) and 80(2) are labeled with the same reference numerals, and the description of the second electrical component 80(2) is omitted as appropriate.

[0104] like Figure 9 As shown, the first electrical component 80 (1) includes a main body 90 having the mounting surface 62 and a rod-shaped electrode terminal 95 extending outward from the mounting surface 62 and functioning as an electrical connection portion.

[0105] The electrode terminal 95 has a threaded portion on its outer peripheral surface, forming part of a threaded connection mechanism that fastens the busbar 10 to the first electrical component 80 (1).

[0106] That is, in the busbar connection structure of this embodiment, the threaded connection mechanism has a threaded portion formed on the outer peripheral surface of the electrode terminal 95 and a nut portion 100 screwed into the threaded portion.

[0107] In this embodiment, the nut portion 100 has a nut head 105 and a flange portion 107 that expands from the nut head 105.

[0108] The insulation and conductivity of the first thermosetting film 20, which is interposed between the mounting surface 62 and the junction area 12 of the busbar 10, are not limited, but it is preferred that it be conductive.

[0109] In this embodiment, the second thermosetting film 30 is interposed between the nut portion 100 and the engagement region 12.

[0110] The insulation and conductivity of the second thermosetting film 30 are not limited, but it is preferred that it be conductive.

[0111] Similar to Embodiment 1, the first and second thermosetting films 20 and 30 are preferably pre-bonded to the bonding area 12 of the busbar 10.

[0112] Explanation of reference numerals in the attached figures

[0113] 10 busbars

[0114] 12 Joint Area

[0115] 15 Card Input Section

[0116] 20 First thermosetting film

[0117] 30. Second thermosetting film

[0118] 50(1), 80(1) First electrical component

[0119] 50(2), 80(2) Second electrical component

[0120] 60, 90 main body

[0121] 62 mounting surfaces

[0122] 65 threaded hole

[0123] 70 Fastening and connecting structural components

[0124] 72 Shaft

[0125] 75 head

[0126] 95 electrode terminals

[0127] 100 Nut Section

Claims

1. A busbar connection structure, characterized in that a conductive busbar is electrically and mechanically connected to an electrical component, wherein... The busbar has a flat engagement area and is connected to the electrical component via a threaded connection mechanism while the engagement area is engaged with the mounting surface of the electrical component. A first thermosetting film is interposed between the joining area and the mounting surface.

2. The busbar interconnection structure according to claim 1, characterized in that, The electrical components are configured such that the mounting surface functions as an electrical connection part. The threaded connection mechanism includes: a fastening connection member having a shaft portion with threads formed on its outer peripheral surface to function as a threaded portion, and a head provided at one end of the shaft portion; and a threaded hole provided on the mounting surface for screwing the shaft portion in. In the engagement area, a locking part is provided for the shaft portion to be inserted through, but the head portion is not inserted through. The first thermosetting film is conductive and configured to allow the shaft portion to be inserted.

3. The busbar interconnection structure according to claim 2, characterized in that, A second thermosetting membrane is interposed between the head and the engagement region. The second thermosetting film is configured to allow the shaft portion to be inserted.

4. The busbar interconnection structure according to claim 3, characterized in that, The second thermosetting film is bonded to the bonding area.

5. The busbar interconnection structure according to claim 1, characterized in that, The electrical component includes a main body having the mounting surface and rod-shaped electrode terminals extending outward from the mounting surface and functioning as electrical connection portions. The threaded connection mechanism has a threaded portion formed on the outer peripheral surface of the electrode terminal and a nut portion screwed into the threaded portion. In the engagement area, a snap-fit ​​portion is provided for the electrode terminal to be inserted through, but the nut portion is not inserted through.

6. The busbar interconnection structure according to claim 5, characterized in that, A conductive second thermosetting film is interposed between the nut portion and the engagement area. The second thermosetting film is configured to allow the electrode terminals to be inserted.

7. The busbar interconnection structure according to claim 6, characterized in that, The second thermosetting film is bonded to the bonding area.

8. The busbar connection structure according to any one of claims 1 to 7, characterized in that, The first thermosetting film is bonded to the bonding area.

9. A busbar connection structure, characterized in that a conductive busbar is electrically and mechanically connected to an electrical component, wherein... The busbar has a flat engagement area and is connected to the electrical component via a threaded connection mechanism while the engagement area is engaged with the mounting surface of the electrical component. The threaded connection mechanism includes: a fastening connection member having a threaded shaft portion and a head disposed at one end of the shaft portion; and a threaded hole disposed on the mounting surface for screwing the shaft portion in. In the engagement area, a locking part is provided for the shaft portion to be inserted through, but the head portion is not inserted through. A thermosetting membrane is interposed between the head and the engagement region. The thermosetting film is configured to allow the shaft portion to be inserted.

10. The busbar interconnection structure according to claim 9, characterized in that, The thermosetting film is bonded to the bonding area.

11. A busbar, a conductive busbar electrically and mechanically connected to an electrical component via a threaded connection mechanism, characterized in that, The busbar has: a flat engagement area that engages with the mounting surface of the electrical component in a connected state; and a snap-in portion formed in the engagement area such that a threaded portion, which is part of the threaded connection mechanism, can be inserted through it. And a first thermosetting film, which is adhered to the opposing surface of the bonding region that faces the mounting surface.

12. The busbar according to claim 11, characterized in that, The first thermosetting film is conductive.

13. The busbar according to claim 11 or 12, characterized in that, The busbar has a second thermosetting film that is bonded to the surface of the bonding region on the side opposite to the opposing surface.

Images