Connection Structure between Bus Bar and Electric Wire

Abstract

The connection structure between the bus bar and the electric wire has: a bus bar that serves as an external terminal; an electric wire having a core wire exposed from an insulating sheath at its end and joining the bus bar to the core wire; a protection member that covers at least the joining portion of the bus bar and the core wire of the electric wire; and a cutting portion that is formed in the core wire at the joining portion of the core wire and the bus bar.

Description

Technical Field

[0001] The present invention relates to a connection structure between a bus bar and a wire, which is used to connect by joining a bus bar serving as an external terminal (external terminal) and a core wire (conductor) of the wire. Background Art

[0002] Japanese Patent Application Laid-Open No. 8-227738 discloses a connection structure between a bus bar and a wire, in which a core wire exposed from the end of the wire is connected to an external terminal portion by welding such as ultrasonic welding. The external terminal portion is formed on a part of the bus bar and is constituted by the upper portion of a flat plate in the horizontal direction. Summary of the Invention

[0003] Technical Problem to be Solved by the Invention

[0004] However, in the connection structure between the bus bar and the wire, when an insulating and cylindrical protection member is used to cover and protect the joint portion between the external terminal portion of the bus bar and the core wire of the wire, since the bus bar and the core wire are connected in a stepped manner, wasted space appears and the overall structure becomes large-sized.

[0005] An object of the present invention is to provide a connection structure between a bus bar and a wire, which can reduce the space formed between the joints of the bus bar and the core wire of the wire and can miniaturize the overall structure.

[0006] Technical Means for Solving the Problem

[0007] The connection structure between the bus bar and the wire according to the embodiment includes: a bus bar that serves as an external terminal; a wire having a core wire exposed from an insulating sheath at the end, and the bus bar is joined to the core wire; a protection member that covers at least the joint portion between the bus bar and the core wire of the wire; and a cutting portion that is formed on the core wire at the joint portion between the core wire and the bus bar.

[0008] The cutting portion can be formed by cutting a part of the core wire on the joint direction side of the joint portion between the core wire and the bus bar.

[0009] The joint surface of the cutting portion joined to the bus bar can be formed into a flat surface.

[0010] It can be that the bus bar and the core wire of the wire are joined by ultrasonic welding, and the joint portion between the bus bar and the core wire of the wire is covered by an insulating and cylindrical protection member.

[0011] Advantages of the Invention

[0012] According to the above structure, a connection structure between a bus bar and a wire can be provided, which can reduce the space formed between the bus bar and the core wire of the wire, and can miniaturize the overall structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 FIG. 1 is a front view showing an example of a connection structure between a bus bar and a wire according to an embodiment.

[0014] Figure 2 FIG. 2 is a cross-sectional view taken along line II-II in Figure 1 FIG. 1.

[0015] Figure 3 FIG. 3 is an exploded perspective view showing a state before joining of the connection structure between the bus bar and the wire. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] Hereinafter, a connection structure between a bus bar and a wire according to an embodiment of the present invention will be described in detail with reference to the drawings.

[0017] As shown in Figure 1 FIG. 1 Figure 2 and FIG. 2, the connection structure 1 between the bus bar and the wire includes: a bus bar 10 that serves as an external terminal; a wire having a core wire 22 exposed from an insulating sheath 21 at its end, and joining the bus bar 10 and the core wire 22; and a protection member 30 that covers a joined portion of the bus bar 10 and the core wire 22.

[0018] The bus bar 10 is formed by punching a conductive metal plate and functions as a terminal for external connection (external terminal). The upper surface 11 of the bus bar 10 is formed as a flat surface and serves as a joining surface for joining with the core wire 22 of the wire 20. The side surfaces 12, 12 of the bus bar 10 are formed as flat surfaces perpendicular to the upper surface 11, and the bottom surface 13 is formed as a curved surface protruding downward in an arc shape. The front surface 14 and the rear surface 15 of the bus bar 10 are also formed as flat surfaces perpendicular to the side surfaces 12, 12. In addition, the bottom surface 13 may be formed as a flat surface parallel to the upper surface 11.

[0019] As shown in Figure 3 FIG. 3

[0020] At the end of the wire 20, the insulating sheath 21 is peeled to form an end portion 20a, and the core wire 22 is exposed. The core wire 22 is a conductor composed of a plurality of wire materials 22a and is formed of a conductive material such as copper or a copper alloy, or aluminum or an aluminum alloy. Figure 2It is formed by cutting the side opposite to the side facing the bus bar 10 when joined to the bus bar 10. By forming the cut portion 23 on the core wire 22 of the electric wire 20, the thickness (height) in the joining direction of the core wire 22 becomes smaller. The joining surface 23a of the cut portion 23 joined to the bus bar 10 is formed as a flat surface. As Figure 2 shown, the bus bar 10 and the core wire 22 of the electric wire 20 are joined by ultrasonic welding. As Figure 1 , Figure 2 shown, when joining by ultrasonic welding, the core wire 22 of the joining portion 2 is compressed into a quadrangular prism shape having substantially the same width as the upper surface 11 of the bus bar 10 and joined to the bus bar 10. In addition, there is a space K, which is the gap between the core wire 22 or the cut portion 23 and the protective member 30 in the joining direction, and is the axial gap between the rear surface 15 of the bus bar 10 joined to the joining surface 23a of the cut portion 23 and the vertical surface 23b of the cut portion 23, and at least a part of this space K is enclosed. In addition, Figure 2 in the figure, the symbol X represents the joining direction (vertical direction), the symbol Y represents the axial direction (horizontal direction) of the core wire 22, and the symbol Z represents the front-rear direction (width direction).

[0021] The protective member 30 is formed of a rigid cylindrical shape from an insulating synthetic resin, and covers at least the bus bar 10 and the electric wire 20 from the end surface 14 in the axial direction of the bus bar 10 to the end portion 20a of the electric wire 20. The protective member 30 covers the exposed core wire 22 of the bus bar 10 and the electric wire 20 in the axial direction and the circumferential direction of the electric wire 20, thereby functioning as a housing of the connector. In addition, by sandwiching a waterproof plug in the form of a rubber ring plate between the protective member 30 and the end portion 20a of the electric wire 20, the sealing performance inside the protective member 30 can be improved.

[0022] As described above, according to the connection structure 1 of the bus bar and the electric wire of the embodiment, as Figure 2 shown, the bus bar 10 connected to the core wire 22 of the electric wire 20 falls within the cut portion 23 of the core wire 22 in the joining direction, and thus the thickness in the joining direction (vertical direction) of the connection structure 1 can be suppressed. As a result, the space K can be reduced, and the entire connection structure 1 of the bus bar 10 and the electric wire 20 can be miniaturized. The space K is the gap between the core wire 22 or the cut portion 23 and the cylindrical protective member 30 in the joining direction, and is a space formed by the axial gap between the rear surface 15 of the bus bar 10 joined to the joining surface 23a of the cut portion 23 and the vertical surface 23b of the cut portion 23.

[0023] In addition, by cutting the cut portion 23 of the core wire 22 in the joining direction (vertical direction) at the joining portion joined to the bus bar 10 and forming the joining surface 23a into a flat surface, the bus bar 10 and the core wire 22 of the electric wire 20 can be easily joined when joined by ultrasonic welding.

[0024] As described above, the present embodiment has been described, but the present embodiment is not limited thereto, and various modifications can be made within the scope of the gist of the present embodiment.

[0025] That is, according to the above embodiment, the bus bar and the core wire of the electric wire are joined by ultrasonic welding, but the bus bar and the core wire of the electric wire may also be joined by resistance welding or the like.

[0026] As described above, several embodiments of the present invention have been described, but these embodiments are presented as examples and are not intended to limit the scope of the invention. These new embodiments can be implemented in various other ways, and various omissions, substitutions, and changes can be made without departing from the gist of the invention. These embodiments and their modifications are included in the scope or gist of the invention and are included in the invention described in the claims and its equivalents.

Claims

1. A connection structure between a bus bar and a wire, characterized in that comprising: a bus bar serving as an external terminal; a wire having a core wire exposed from an insulating sheath at an end, and the bus bar being joined to the core wire; a protective member covering at least a joined portion of the bus bar and the core wire of the wire; and a cutting portion formed on the core wire at a joined portion of the core wire and the bus bar, wherein the cutting portion has a joining surface for joining with the bus bar and a vertical surface perpendicular to the joining surface, the bus bar has a rear surface facing the vertical surface, and there is a gap between the vertical surface and the rear surface.

2. The connection structure of a bus bar and a wire according to claim 1, characterized in that the cutting portion is formed by cutting a portion on a joining direction side of the core wire at a joined portion of the core wire and the bus bar.

3. The connection structure of a bus bar and a wire according to claim 1 or 2, characterized in that a joining surface of the cutting portion joined to the bus bar is formed as a flat surface.

4. The connection structure of a bus bar and a wire according to claim 1 or 2, characterized in that the bus bar and the core wire of the wire are joined by ultrasonic welding, and a joined portion of the bus bar and the core wire of the wire is covered by the insulating tubular protective member.

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