Terminal unit

Abstract

Provided is a terminal unit which has low resistance and generates little heat even if a large current flows through the terminal unit. A terminal unit (10) is provided with: a first terminal (11); a second terminal (21) connected to the wire terminal (42a) and assembled and connected to the first terminal (11); and a pressing member (31) that causes the first terminal (11) and the second terminal (21) to be pressed against each other and come into contact with each other, the first terminal (11) having one or more protruding contact points (13) protruding in a direction orthogonal to a first terminal-side mounting surface (12) on which the second terminal (21) is mounted. The second terminal (21) has one or more through-holes (24) through which the wire end (42a) can be seen from a second terminal-side mounting surface (22) on which the first terminal (11) is mounted, and in a state in which the first terminal (11) and the second terminal (21) are mounted and pressed by a pressing member (31) to be in contact with each other, the protruding contact (13) of the first terminal (11) is in direct contact with the wire end (42a) through the through-hole (24) of the second terminal (21).

Description

Technical Field

[0001] The present invention relates to a terminal unit. Background Art

[0002] Conventionally, the following terminal unit is known, which includes: a first terminal; a second terminal connected to the end of an electric wire and assembled to the first terminal; and an elastic member serving as a pressing member to press the first terminal and the second terminal to contact each other. As a prior art document disclosing such a terminal unit, there is the following patent document 1. Fig.33 As shown, the existing terminal unit (10) disclosed in patent document 1 includes a first terminal (12), a second terminal (14) and an elastic component (16), the first terminal (12) having a first side opposing surface (24) which is opposite to the second terminal (14) in the left direction and pressed against the second terminal (14) side, the second terminal (14) having a wire connecting portion (32) connected to the wire (18) and a second side opposing surface (38) which is opposite to the first terminal (12) in the right direction and pressed against the first terminal (12) side, the second side opposing surface (38) having a snap-fitting protrusion (40) extending along the assembly direction of the first terminal (12) and the second terminal (14) and protruding in the right direction, the first side opposing surface (24) having a first contact surface (28) and a second contact surface (30) which extend along the assembly direction and contact the snap-fitting protrusion (40) on both sides of the front-rear direction which is orthogonal to both the assembly direction and the left direction. In addition, reference numerals related to the description of the prior art document are distinguished from the embodiments of the present invention by adding brackets. Prior art literature Patent Literature

[0003] Patent Document 1: Japanese Patent Application Publication No. 2022-150224 Patent Document 2: Japanese Patent Application Publication No. 2023-097644 Summary of the invention 1. Technical issues to be resolved

[0004] However, the terminal unit (10) of the prior art disclosed in the above-mentioned patent document 1 has the following technical problem: when the wire (18) and the first terminal (12) are connected, the overall resistance after adding the contact resistance and the conductor resistance is large, and if a large current flows, it will generate heat, which is not suitable for dealing with large currents.

[0005] Therefore, the object of the present invention is to provide a terminal unit, which, when a first terminal and a second terminal are assembled, has a small resistance because the first terminal and the end of an electric wire connected to the second terminal are in direct contact. Thus, when electrical conduction is achieved between the end of the electric wire and the first terminal, little heat is generated even if a large current flows. (II) Technical solution

[0006] The terminal unit of the present invention comprises: a first terminal; a second terminal, which is connected to the end of the wire and assembled to the first terminal; and a pressing component, which presses the first terminal and the second terminal to contact each other, and is characterized in that the first terminal has one or more protruding contacts protruding in a direction orthogonal to the first terminal side assembly surface on which the second terminal is assembled, and the second terminal has one or more through holes that can visually see the end of the wire from the second terminal side assembly surface on which the first terminal is assembled, and when the first terminal and the second terminal are assembled and brought into contact by being pressed by the pressing component, the protruding contact of the first terminal directly contacts the end of the wire through the through hole of the second terminal.

[0007] That is, in the terminal unit of the present invention, the protruding contact of the first terminal directly contacts the end of the wire through the through hole of the second terminal, so the resistance of the terminal unit (the resistance from the end of the wire to the first terminal) does not include the resistance of the second terminal. Fig.33 In the terminal unit of the prior art shown in , the second terminal is between the first terminal and the end of the wire, so the resistance of the terminal unit includes "the contact resistance between the end of the wire and the second terminal", "the conductor resistance of the second terminal" and "the contact resistance between the second terminal and the first terminal" as the resistance of the second terminal, and the overall resistance becomes larger. That is, in the terminal unit of the present invention, it is possible to realize a terminal unit with a smaller overall resistance than the prior art and less heat generation even when a large current flows.

[0008] Another terminal unit of the present invention comprises a first terminal and a second terminal connected to the end of an electric wire and assembled to the first terminal, characterized in that the first terminal is a cylindrical elastic sleeve, the second terminal is a round pin, the elastic sleeve constituting the first terminal has one or more protruding contacts protruding toward the second terminal side when the first terminal and the second terminal are assembled, and the round pin constituting the second terminal has one or more through holes through which the end of the electric wire can be visually seen, and when the first terminal and the second terminal are assembled and brought into contact, the protruding contact of the first terminal directly contacts the end of the electric wire through the through hole of the second terminal.

[0009] In the terminal unit of the present invention, the electric wire end is a flexible stranded wire, and the protruding contact of the first terminal can be sunk into the stranded wire when the first terminal and the second terminal are assembled and brought into contact with each other.

[0010] That is, in the terminal unit of the present invention, since the protruding contact of the first terminal is embedded in the stranded wire, the contact between the first terminal and the end of the wire can be made more reliable, and the dimensional tolerance of the protruding contact can be absorbed to suppress the shaking of the assembly state of the first terminal and the second terminal.

[0011] In addition, in the terminal unit of the present invention, the first terminal side assembly surface of the first terminal and the second terminal side assembly surface of the second terminal are both flat-plate-shaped, the second terminal and the wire end are connected by welding, the one or more protruding contacts of the first terminal have a quadrilateral protruding shape, the one or more through holes of the second terminal have a quadrilateral through shape corresponding to the quadrilateral of the protruding contact, and the one or more protruding contacts of the first terminal can directly contact the wire end through the one or more through holes of the second terminal.

[0012] In addition, in the terminal unit of the present invention, the first terminal side assembly surface of the first terminal and the second terminal side assembly surface of the second terminal are both flat-plate-shaped, the second terminal and the wire end are connected by crimping, the one or more protruding contacts of the first terminal have a quadrilateral protruding shape, the one or more through holes of the second terminal have a quadrilateral through shape corresponding to the quadrilateral of the protruding contact, and the one or more protruding contacts of the first terminal can directly contact the wire end through the one or more through holes of the second terminal.

[0013] Another terminal unit of the present invention comprises: a first terminal; a second terminal, which is connected to the end of the electric wire and assembled to the first terminal; and a pressing component, which presses the first terminal and the second terminal to make them contact with each other, characterized in that the first terminal has a first terminal side assembly surface for assembling the second terminal, and the first terminal side assembly surface is flat, and the second terminal has one or more ball contacts rotatably held relative to the second terminal side assembly surface for assembling the first terminal, and when the first terminal and the second terminal are assembled and pressed and brought into contact by the pressing component, the ball contact of the second terminal directly contacts the first terminal side assembly surface of the flat-plate-shaped first terminal, and directly contacts the end of the electric wire connected to the second terminal.

[0014] In addition, in another terminal unit of the present invention, one or more of the spherical contacts of the second terminal are spherical balls, and the balls serving as the spherical contacts can be rotatably held by the following components: a ball holding hole formed in the second terminal; the wire end installed on the opposite side of the assembly surface of the second terminal side in a manner that blocks the ball holding hole; and a ball pressure plate installed on the assembly surface side of the second terminal side with the ball accommodated in the ball holding hole, and maintaining a portion of the surface of the ball protruding toward the first terminal side. (III) Beneficial effects

[0015] According to the present invention, a terminal unit can be provided, which, when a first terminal and a second terminal are assembled, has a small resistance due to direct contact between the first terminal and the end of an electric wire connected to the second terminal when electrical conduction is achieved between the end of the electric wire and the first terminal, and generates little heat even when a large current flows. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a perspective view of the appearance of the terminal unit according to the first embodiment as seen from the upper left front. Figure 2 This is an external perspective view of the terminal unit according to the first embodiment as viewed from the lower right rear side. Figure 3 yes Figure 1 0 is an exploded perspective view of the terminal unit of the first embodiment shown in FIG. Figure 4 yes Figure 2 0 is an exploded perspective view of the terminal unit of the first embodiment shown in FIG. Figure 5 This is a perspective view of the appearance of the first terminal according to the first embodiment as viewed from the upper right rear side. Figure 6 This is a perspective view of the appearance of the second terminal of the first embodiment as viewed from the upper left front. Figure 7 This is a perspective front view for explaining the connection state between the first terminal and the second terminal according to the first embodiment. Figure 8 Yes means Figure 7 Section view of the AA line section. Fig. 9 This is a perspective view of the appearance of the terminal unit according to the second embodiment as viewed from the upper left front. Fig.10 This is a perspective view of the appearance of the terminal unit according to the second embodiment as viewed from the lower right rear side. Fig.11 yes Fig. 9 0 is an exploded perspective view of a terminal unit according to a second embodiment shown in FIG. Fig.12 yes Fig.10 0 is an exploded perspective view of a terminal unit according to a second embodiment shown in FIG. Fig.13 This is a perspective view of the appearance of the first terminal of the second embodiment as viewed from the upper right rear side. Fig.14 This is an external perspective view of the second terminal of the second embodiment as viewed from the upper left front. Fig.15 This is a perspective front view for explaining a connection state between a first terminal and a second terminal according to the second embodiment. Fig.16 Yes means Fig.15 Cross-sectional view of the BB line section. Fig.17 This is a perspective view of the appearance of the terminal unit according to the third embodiment as viewed from the upper left front. Fig.18 This is a perspective view of the appearance of the terminal unit according to the third embodiment as viewed from the lower right rear side. Fig.19 yes Fig.17 0 is an exploded perspective view of a terminal unit according to a third embodiment shown in FIG. Fig. 20 yes Fig.18 0 is an exploded perspective view of a terminal unit according to a third embodiment shown in FIG. Fig.21 This is a front view for explaining the connection state between the first terminal and the second terminal according to the third embodiment. Fig. 22 Yes means Fig.21 Cross-sectional view of the CC line section. Fig.23 This is a perspective view of the appearance of a terminal unit according to a fourth embodiment, as viewed from the upper left front. Fig.24 This is an external perspective view of a terminal unit according to a fourth embodiment as viewed from the lower right rear side. Fig.25 yes Fig.23 0 is an exploded perspective view of a terminal unit according to a fourth embodiment shown in FIG. Fig.26 yes Fig.24 0 is an exploded perspective view of a terminal unit according to a fourth embodiment shown in FIG. Fig. 27 This is a perspective view of the appearance of the first terminal of the fourth embodiment as seen from the upper right rear side. Fig.28 This is an external perspective view of the second terminal of the fourth embodiment as viewed from the upper left front. Fig.29 This is an external perspective view of the second terminal of the fourth embodiment as viewed from the lower right rear side. Fig.30 yes Fig.28 0 is an exploded perspective view of a second terminal of a fourth embodiment shown in FIG. Fig.31 This is a perspective front view for explaining a connection state between a first terminal and a second terminal according to a fourth embodiment. Fig.32 Yes means Fig.31 Cross-sectional view of the DD line section. Fig.33 This is an exploded perspective view showing an example of a schematic configuration of a terminal unit of Patent Document 1. Fig.34 This is a cross-sectional view showing an example of a schematic configuration of a terminal unit of Patent Document 2. Description of Reference Numerals 10-terminal unit (of the first and second embodiments); 11-first terminal; 12-first terminal side assembly surface; 13-protrusion contact; 21-second terminal; 22-second terminal side assembly surface; 23-stranded wire mounting surface; 24-through hole; 25-riveted wall portion; 31-pressing member; 32-plate-shaped elastic portion; 41-wire; 42-stranded wire; 42a-wire end; 43-insulator; 110-terminal unit (of the third embodiment); 111-first terminal; 112-elastic force applying arm; 113-protrusion contact; 121-second terminal; 124-through hole; 141 -electric wire; 142-stranded wire; 142a-end of electric wire; 143-insulator; 210-terminal unit (of the fourth embodiment); 211-first terminal; 212-first terminal side assembly surface; 221-second terminal; 222-second terminal side assembly surface; 223-stranded wire mounting surface; 224-second terminal body; 224a-ball retaining hole; 225-ball (spherical contact); 226-ball pressure plate; 226a-opening hole; 231-pressing component; 232-plate-shaped elastic portion; 241-electric wire; 242-stranded wire; 242a-end of electric wire; 243-insulator. DETAILED DESCRIPTION

[0017] Hereinafter, the preferred embodiment for implementing the present invention will be described using the accompanying drawings. In addition, in the present invention, a first direction, a second direction, and a third direction are defined. In the accompanying drawings, for the convenience of explanation, each direction is represented as an X direction, a Y direction, and a Z direction. In this specification, the first direction is the left-right direction. In the accompanying drawings, the left-right direction is represented as the X direction. In particular, the right side is the +X direction and the left side is the -X direction. In addition, in this specification, the second direction is the up-down direction. In the accompanying drawings, the up-down direction is represented as the Y direction. In particular, the top is the +Y direction and the bottom is the -Y direction. In addition, in this specification, the third direction is the front-back direction. In the accompanying drawings, the front-back direction is represented as the Z direction. In particular, the front is the +Z direction and the back is the -Z direction.

[0018] In addition, the following embodiments are not intended to limit the inventions, and not all combinations of features described in the embodiments are essential to the solution means of the invention.

[0019] [First embodiment] use Figures 1 to 8 , the terminal unit 10 according to the first embodiment will be described.

[0020] like Figure 1 to Figure 4 As shown, the terminal unit 10 of the first embodiment includes a first terminal 11 , a second terminal 21 , and a pressing member 31 .

[0021] The first terminal 11 is a component made of conductive metal. Figure 5 As shown, the back side of the first terminal 11 of the first embodiment is a flat first terminal side assembly surface 12. In addition, the first terminal 11 has six protrusion contacts 13, and the six protrusion contacts 13 protrude in a third direction orthogonal to the first terminal side assembly surface 12 (a surface parallel to the XY plane formed by the first direction and the second direction) of the second terminal 21 to be assembled, that is, in the rear (-Z direction).

[0022] The second terminal 21 is a component made of conductive metal. Figure 6As shown, the front side of the second terminal 21 of the first embodiment is a second terminal side assembly surface 22 in the form of a flat plate, and the back side is a stranded wire installation surface 23 in the form of a flat plate. The front and back sides of the second terminal 21 formed by the second terminal side assembly surface 22 and the stranded wire installation surface 23 are configured to overlap when viewed in the front-to-back direction, i.e., the Z direction. In addition, the second terminal side assembly surface 22 is a portion that is configured to be opposite to the first terminal side assembly surface 12 of the first terminal 11 when the first terminal 11 and the second terminal 21 are assembled. In addition, six through holes 24 are formed on the second terminal 21, and the six through holes 24 penetrate in the front-to-back direction, i.e., the Z direction, from the second terminal side assembly surface 22 on the front side of the assembled first terminal 11 toward the stranded wire installation surface 23 on the back side. These six through holes 24 become portions for inserting the six protruding contacts 13 of the first terminal 11 when the first terminal 11 and the second terminal 21 are assembled.

[0023] On the other hand, an electric wire 41 capable of conducting electricity is connected to the stranded wire mounting surface 23. The electric wire 41 of the first embodiment has a stranded wire 42 formed by twisting a plurality of conductive copper wires, and is configured such that the outer periphery of the stranded wire 42 is covered with an insulator 43 as a protective member. In addition, the insulator 43 is removed from the end of the electric wire 41 on the side connected to the stranded wire mounting surface 23, and the stranded wire 42 is exposed to form an electric wire end 42a.

[0024] In the first embodiment, the stranded wire mounting surface 23 of the second terminal 21 and the wire end 42a of the wire 41 are connected by welding. At this time, since the wire end 42a is welded in a manner covering the surface of the stranded wire mounting surface 23 (the rear surface of the second terminal 21), the six through holes 24 formed in the second terminal 21 are blocked by the wire end 42a. Figure 6 As shown, with respect to the second terminal 21 , when the six through holes 24 formed in the second terminal 21 are viewed from the front side, the wire ends 42 a can be visually seen through the through holes 24 .

[0025] Therefore, when the first terminal 11 and the second terminal 21 are assembled, when the six protruding contacts 13 of the first terminal 11 are respectively inserted into the six through holes 24, as shown in FIG. Figure 8 As shown, the six protruding contacts 13 are in direct contact with the wire ends 42a. In addition, at this time, since the height dimension of the six protruding contacts 13 is configured to be larger than the depth dimension of the six through holes 24, the assembled first terminal 11 and the second terminal 21 are in a state where only the six protruding contacts 13 are in direct contact with the wire ends 42a. Therefore, the electricity transmitted by the wire 41 can be directly conducted from the wire ends 42a of the stranded wire 42 to the first terminal 11 and transmitted, so that the terminal unit 10 with low resistance and low heat generation even when a large current flows can be realized.

[0026] In addition, since the wire end 42a that the six protruding contacts 13 directly contact is the flexible stranded wire 42, when the first terminal 11 and the second terminal 21 are assembled and contacted with each other, the protruding contacts 13 of the first terminal 11 sink into the stranded wire 42, i.e., the wire end 42a. According to this structure, the height difference of the six protruding contacts 13 and the error during assembly can be absorbed, so the contact resistance can be reduced by multi-point contact, and the temperature rise when a large current flows can be suppressed, so that a larger current can flow.

[0027] Furthermore, in the first embodiment, the six protruding contacts 13 of the first terminal 11 have a protruding shape in the form of a quadrilateral, and on the other hand, the six through holes 24 of the second terminal 21 have a through shape in the form of a quadrilateral corresponding to the quadrilateral of the protruding contacts 13. Therefore, even when the first terminal 11 and the second terminal 21 are assembled, in the case where the terminals move relative to each other due to vibration or the like, the protruding contacts 13 and the through holes 24, which are quadrilateral, fit together, and the fitting portion acts to suppress the movement in two dimensions, so that the wear of the directly contacting portion can be appropriately suppressed.

[0028] In addition, in the second terminal 21 of the first embodiment, the front and back surfaces of the second terminal 21 formed with the second terminal side assembly surface 22 and the stranded wire mounting surface 23 are configured to overlap when viewed in the front-to-back direction, i.e., the Z direction, so that the second terminal 21 can be made into a compact structure compared to the prior art. Therefore, the terminal unit 10 of the first embodiment can be miniaturized compared to the prior art.

[0029] like Figure 1 as well as Figure 2 As shown, the first terminal 11 and the second terminal 21 described above can maintain the state of connecting the terminals to each other through a pressing component 31. The pressing component 31 is a component in the shape of a clip, and is formed with two plate-like elastic parts 32 that can apply elastic force as a pressing force to the front surface and the rear surface of the pressing component 31. Moreover, the pressing component 31 is assembled in a state where the first terminal side assembly surface 12 of the first terminal 11 and the second terminal side assembly surface 22 of the second terminal 21 are opposite to each other, so that the two plate-like elastic parts 32 apply an elastic force that presses the first terminal 11 and the second terminal 21 to each other, and the first terminal 11 and the second terminal 21 can be maintained connected to each other. In addition, the pressing component of the present invention can be of any structure as long as it is a component that can exert a pressing force, for example, a pressing component that can use a fastening force such as a bolt.

[0030] The structure of the terminal unit 10 according to the first embodiment has been described above. Next, a process of assembling the first terminal 11 , the second terminal 21 , and the pressing member 31 to configure the terminal unit 10 will be described.

[0031] As a process of assembling the first terminal 11, the second terminal 21, and the pressing member 31 to form the terminal unit 10, for example, Figure 3 To explain, first, the first terminal side assembly surface 12 of the first terminal 11 is moved in the rear direction (-Z direction) toward the second terminal side assembly surface 22 of the second terminal 21, and the six protruding contacts 13 of the first terminal 11 are embedded in the six through holes 24 of the second terminal 21. From this state, the pressing member 31 is moved downward (-Y direction), and the first terminal 11 and the second terminal 21 are clamped by the two plate-shaped elastic parts 32, thereby achieving Figure 1 In this state, the first terminal 11 and the second terminal 21 are assembled in a state where the first terminal side assembly surface 12 of the first terminal 11 and the second terminal side assembly surface 22 of the second terminal 21 are opposite to each other, by the pressing force formed by the elastic force applied by the two plate-shaped elastic parts 32 of the pressing member 31. Figure 8 As shown, the first terminal 11 and the second terminal 21 are in a state where the six protrusion contacts 13 are in direct contact with the wire end 42a, thereby realizing a terminal unit 10 with an extremely short power path. Therefore, according to the terminal unit 10 of the first embodiment, the resistance can be reduced, and even if a large current flows, the heat can be reduced.

[0032] Above, use Figures 1 to 8 The structure and assembly process of the terminal unit 10 of the first embodiment have been described, but the technical scope of the present invention is not limited to the scope described in the above embodiment. Various changes or improvements can be added to the above embodiment.

[0033] For example, in the first embodiment described above, the case where the stranded wire mounting surface 23 of the second terminal 21 and the wire end 42a of the wire 41 are connected by welding is illustrated, but for welding as the connecting means, in addition to the means of joining the stranded wire mounting surface 23 of the second terminal 21 and the wire end 42a of the wire 41 at the molecular level using heat, all connection means included in the definition of welding such as soldering and welding can also be used.

[0034] In addition, in the second terminal 21 of the first embodiment described above, Figure 6As shown, when the six through holes 24 formed in the second terminal 21 are observed from the front side, the structure is formed so that the wire end 42a can be visually seen through the through holes 24, and the stranded wire 42 is in a bare state for the wire end 42a that can be visually seen through the through holes 24. For the wire end 42a composed of the stranded wire 42 in the bare state, the surface of the visible stranded wire 42 can be protected by performing surface treatment such as silver plating. Although the softness of the stranded wire 42 is slightly deteriorated by the implementation of surface treatment such as silver plating, the oxidation of the copper wire surface can be suppressed, and therefore, the effect of reducing the contact resistance can be obtained for a long time. The terminal unit with such an improved structure is also included in the present invention.

[0035] The preferred embodiments of the present invention have been described above. Figures 9 to 16 , a second embodiment to which the present invention can be applied will be described. In the following description, the same or similar components as those described in the first embodiment may be denoted by the same reference numerals and description thereof may be omitted.

[0036] [Second Embodiment] use Figures 9 to 16 , a terminal unit 10 according to a second embodiment will be described.

[0037] like Figures 9 to 12 As shown, the terminal unit 10 according to the second embodiment includes a first terminal 11 , a second terminal 21 , and a pressing member 31 .

[0038] The first terminal 11 is a component made of conductive metal. Fig.13 As shown, the back side of the first terminal 11 of the second embodiment is a flat first terminal side assembly surface 12. In addition, the first terminal 11 has six protrusion contacts 13, and the six protrusion contacts 13 protrude in a third direction orthogonal to the first terminal side assembly surface 12 (a surface parallel to the XY plane formed by the first direction and the second direction) of the second terminal 21 to be assembled, that is, in the rear (-Z direction).

[0039] The second terminal 21 is a component made of conductive metal. Fig.14As shown, the front side of the second terminal 21 of the second embodiment is a second terminal side assembly surface 22 in the form of a flat plate, and the back side of the second terminal side assembly surface 22 is a stranded wire installation surface 23 in the form of a flat plate. The front and back sides of the second terminal 21 formed by the second terminal side assembly surface 22 and the stranded wire installation surface 23 are configured to overlap when viewed in the front-to-back direction, i.e., the Z direction. In addition, the second terminal side assembly surface 22 is a portion that is configured to be opposite to the first terminal side assembly surface 12 of the first terminal 11 when the first terminal 11 and the second terminal 21 are assembled. In addition, six through holes 24 are formed on the second terminal 21, and the six through holes 24 penetrate in the front-to-back direction, i.e., the Z direction, from the second terminal side assembly surface 22 on the front side of the assembled first terminal 11 toward the stranded wire installation surface 23 on the back side. These six through holes 24 become portions for inserting the six protruding contacts 13 of the first terminal 11 when the first terminal 11 and the second terminal 21 are assembled.

[0040] On the other hand, an electric wire 41 capable of conducting electricity is connected to the stranded wire mounting surface 23. The electric wire 41 of the second embodiment has a stranded wire 42 formed by twisting a plurality of conductive copper wires, and is configured such that the outer periphery of the stranded wire 42 is covered with an insulator 43 as a protective member. In addition, the insulator 43 is removed from the end of the electric wire 41 on the side connected to the stranded wire mounting surface 23, and the stranded wire 42 is exposed to form an electric wire end 42a.

[0041] In the second embodiment, the stranded wire mounting surface 23 of the second terminal 21 and the wire end 42a of the wire 41 are connected by crimping. More specifically, in the second terminal 21, riveted wall surfaces 25 are formed extending above and below the second terminal side assembly surface 22 on the front side and the stranded wire mounting surface 23 on the back side, and the riveted wall surfaces 25 are riveted and bent in a manner to wrap around the wire end 42a, so that the wire end 42a is crimped in a manner covering the surface of the stranded wire mounting surface 23 (the rear surface of the second terminal 21). Therefore, the six through holes 24 formed in the second terminal 21 are blocked by the wire ends 42a. That is, as Fig.14 As shown, with respect to the second terminal 21 , when the six through holes 24 formed in the second terminal 21 are viewed from the front side, the wire ends 42 a can be visually seen through the through holes 24 .

[0042] Therefore, when the first terminal 11 and the second terminal 21 are assembled, when the six protruding contacts 13 of the first terminal 11 are respectively inserted into the six through holes 24, as shown in FIG. Fig.16As shown, the six protruding contacts 13 are in direct contact with the wire ends 42a. In addition, at this time, since the height dimension of the six protruding contacts 13 is configured to be larger than the depth dimension of the six through holes 24, the assembled first terminal 11 and the second terminal 21 are in a state where only the six protruding contacts 13 are in direct contact with the wire ends 42a. Therefore, the electricity transmitted by the wire 41 can be directly conducted from the wire ends 42a of the stranded wire 42 to the first terminal 11 and transmitted, so that the terminal unit 10 with low resistance and low heat generation even when a large current flows can be realized.

[0043] In addition, since the wire end 42a that the six protruding contacts 13 directly contact is the flexible stranded wire 42, when the first terminal 11 and the second terminal 21 are assembled and contacted with each other, the protruding contact 13 of the first terminal 11 sinks into the stranded wire 42, i.e., the wire end 42a. According to this structure, the height difference of the six protruding contacts 13 and the error during assembly can be absorbed, so the contact resistance can be reduced by multi-point contact, and the temperature rise when a large current flows can be suppressed, so that a larger current can flow.

[0044] Furthermore, in the second embodiment, the six protruding contacts 13 of the first terminal 11 have a protruding shape in the form of a quadrilateral, and on the other hand, the six through holes 24 of the second terminal 21 have a through shape in the form of a quadrilateral corresponding to the quadrilateral of the protruding contacts 13. Therefore, even when the first terminal 11 and the second terminal 21 are assembled, in the case where the terminals move relative to each other due to vibration or the like, the protruding contacts 13 and the through holes 24, which are quadrilateral, fit together, and the fitting portion acts to suppress the movement in two dimensions, so that the wear of the directly contacting portion can be appropriately suppressed.

[0045] In addition, in the second terminal 21 of the second embodiment, the front and back surfaces of the second terminal 21 formed with the second terminal side assembly surface 22 and the stranded wire mounting surface 23 are configured to overlap when viewed in the front-to-back direction, i.e., the Z direction, so that the second terminal 21 can be made into a compact structure compared to the prior art. Therefore, the terminal unit 10 of the second embodiment can be miniaturized compared to the prior art.

[0046] like Fig. 9 as well as Fig.10As shown, the first terminal 11 and the second terminal 21 described above can maintain the state of connecting the terminals to each other through a pressing component 31. The pressing component 31 is a component in the shape of a clip, and is formed with two plate-like elastic parts 32 that can apply elastic force as a pressing force to the front surface and the rear surface of the pressing component 31. Moreover, the pressing component 31 is assembled in a state where the first terminal side assembly surface 12 of the first terminal 11 and the second terminal side assembly surface 22 of the second terminal 21 are opposite to each other, so that the two plate-like elastic parts 32 apply an elastic force that presses the first terminal 11 and the second terminal 21 to each other, and the first terminal 11 and the second terminal 21 can be maintained connected to each other. In addition, the pressing component of the present invention can be of any structure as long as it is a component that can exert a pressing force, for example, a pressing component that can use a fastening force such as a bolt.

[0047] The structure of the terminal unit 10 according to the second embodiment has been described above. Next, a process of assembling the first terminal 11 , the second terminal 21 , and the pressing member 31 to configure the terminal unit 10 will be described.

[0048] As a process of assembling the first terminal 11, the second terminal 21, and the pressing member 31 to form the terminal unit 10, for example, Fig.11 To explain, first, the first terminal side assembly surface 12 of the first terminal 11 is moved in the rear direction (-Z direction) toward the second terminal side assembly surface 22 of the second terminal 21, and the six protruding contacts 13 of the first terminal 11 are embedded in the six through holes 24 of the second terminal 21. From this state, the pressing member 31 is moved downward (-Y direction), and the first terminal 11 and the second terminal 21 are clamped by the two plate-shaped elastic parts 32, thereby achieving Figure 1 In this state, the first terminal 11 and the second terminal 21 are assembled in a state where the first terminal side assembly surface 12 of the first terminal 11 and the second terminal side assembly surface 22 of the second terminal 21 are opposite to each other, by the pressing force formed by the elastic force applied by the two plate-shaped elastic parts 32 of the pressing member 31. Fig.16 As shown, the first terminal 11 and the second terminal 21 are in a state where the six protrusion contacts 13 are in direct contact with the wire end 42a, thereby realizing a terminal unit 10 with an extremely short power path. Therefore, according to the terminal unit 10 of the second embodiment, the resistance can be reduced, and even if a large current flows, the heat can be reduced.

[0049] Above, use Figures 9 to 16 , the structure and assembly process of the terminal unit 10 of the second embodiment have been described, but the technical scope of the present invention is not limited to the scope described in the above embodiment. Various changes or improvements can be added to the above embodiment.

[0050] For example, in the above-mentioned second embodiment, the case where the stranded wire mounting surface 23 of the second terminal 21 and the wire end 42a of the wire 41 are connected by crimping is illustrated, but for crimping as the connecting means, in addition to connecting means that utilize plastic deformation of metal materials such as riveting, all connecting means included in the definition of crimping such as hot crimping, ultrasonic hot crimping, etc. can also be used.

[0051] In addition, in the second terminal 21 of the second embodiment described above, Fig.14 As shown, when the six through holes 24 formed in the second terminal 21 are observed from the front side, the wire ends 42a can be visually seen through the through holes 24, and the stranded wires 42 are exposed to the wire ends 42a that can be visually seen through the through holes 24. By performing surface treatments such as silver plating on the wire ends 42a formed by the exposed stranded wires 42, the surfaces of the visible stranded wires 42 can be protected. Although the softness of the stranded wires 42 is slightly deteriorated by the implementation of surface treatments such as silver plating, the oxidation of the copper wire surface can be suppressed, thereby achieving the effect of reducing contact resistance for a long time. A terminal unit with such an improved structure is also included in the present invention.

[0052] The preferred embodiments of the present invention have been described above. Figure 17 to Figure 22 , a third embodiment to which the present invention can be applied is described.

[0053] [Third Embodiment] use Figure 17 to Figure 22 , a terminal unit 110 according to a third embodiment will be described.

[0054] like Figures 17 to 20 As shown, the terminal unit 110 of the third embodiment includes a first terminal 111 and a second terminal 121 .

[0055] The first terminal 111 is a component made of conductive metal and is a component formed into a cylindrical elastic sleeve. Fig. 20 As shown, the first terminal 111 of the third embodiment has six elastic force applying arms 112 extending along the second terminal 121 side, and the inner circumference of each of the six elastic force applying arms 112 is formed with a protruding contact 113 that protrudes toward the second terminal 121 side when the first terminal 111 and the second terminal 121 are assembled. That is, the first terminal 111 has a total of six protruding contacts 113.

[0056] The second terminal 121 is a component made of conductive metal and is a component formed as a round pin. Fig. 20As shown, the second terminal 121 of the third embodiment has six through holes 124 on the outer peripheral surface of the portion to be assembled with the first terminal 111. These six through holes 124 serve as the portions for inserting the six protruding contacts 113 of the first terminal 111 when the first terminal 111 and the second terminal 121 are assembled.

[0057] In addition, a conductive wire 141 is provided at the right end of the second terminal 121 , that is, at the opposite end to the portion to be assembled with respect to the first terminal 111 .

[0058] The electric wire 141 of the third embodiment has a stranded wire 142 formed by twisting a plurality of conductive copper wires, and is configured with an insulator 143 as a protective member covering the outer periphery of the stranded wire 142. In addition, the insulator 143 is removed from the end of the electric wire 141 connected to the second terminal 121, and the stranded wire 142 is exposed to form an electric wire end 142a.

[0059] In the third embodiment, the second terminal 121 and the wire end 142a of the wire 141 are connected by crimping. More specifically, the wire end 142a is crimped and fixed to the second terminal 121 by performing a caulking process while the wire end 142a is inserted into the second terminal 121. At this time, the six through holes 124 formed in the second terminal 121 are blocked on the inner side by the wire end 142a. That is, for example, Fig. 20 As shown, with respect to the second terminal 121 , when the six through holes 124 formed in the second terminal 121 are viewed from the outer peripheral side, the wire ends 142 a can be visually seen through the through holes 124 .

[0060] Therefore, when the first terminal 111 and the second terminal 121 are assembled, when the six protruding contacts 113 of the first terminal 111 are respectively inserted into the six through holes 124, as shown in FIG. Fig. 22 As shown, the six protruding contacts 113 are in direct contact with the wire end 142a. In addition, at this time, since the six elastic force applying arms 112 apply an inward elastic force, the six protruding contacts 113 are pressed toward the wire end 142a, so that the six protruding contacts 113 are reliably embedded in the six through holes 124. In addition, the height dimension of the six protruding contacts 113 is configured to be larger than the depth dimension of the six through holes 124, so that the assembled first terminal 111 and the second terminal 121 are in a state where only the six protruding contacts 113 are in direct contact with the wire end 142a. Therefore, the electricity transmitted by the wire 141 can be directly conducted from the wire end 142a of the stranded wire 142 to the first terminal 111 and transmitted, so that the terminal unit 110 with low resistance and less heat generation even when a large current flows can be realized.

[0061] In addition, since the wire end 142a that the six protruding contacts 113 directly contact is the flexible stranded wire 142, when the first terminal 111 and the second terminal 121 are assembled and contacted with each other, the protruding contact 113 of the first terminal 111 sinks into the stranded wire 142, i.e., the wire end 142a. According to this structure, the height difference of the six protruding contacts 113 and the error during assembly can be absorbed, so the contact resistance can be reduced by multi-point contact, and the temperature rise when a large current flows can be suppressed, so that a larger current can flow.

[0062] Furthermore, in the third embodiment, the six protruding contacts 113 of the first terminal 111 have a protruding shape in the form of a quadrilateral, and on the other hand, the six through holes 124 of the second terminal 121 have a through shape in the form of a quadrilateral corresponding to the quadrilateral of the protruding contacts 113. Therefore, even when the first terminal 111 and the second terminal 121 are assembled, if the terminals move relative to each other due to vibration or the like, the protruding contacts 113 and the through holes 124, which are in the form of a quadrilateral, fit together, and the fitting portion acts to suppress the movement, so that the wear of the directly contacting portion can be appropriately suppressed.

[0063] The first terminal 111 and the second terminal 121 of the third embodiment described above do not require the pressing member 31 used in the first and second embodiments. Therefore, the terminal unit 110 of the third embodiment has advantages such as a small number of components and a reduced manufacturing cost.

[0064] In addition, the assembly process of the terminal unit 110 of the third embodiment only requires that the six protruding contacts 113 be fitted into the six through holes 124 by fitting the first terminal 111 into the second terminal 121. Fig. 22 As shown, the first terminal 111 and the second terminal 121 are in a state where the six protrusion contacts 113 are in direct contact with the wire end 142a, thereby realizing a terminal unit 110 with an extremely short power path. Therefore, according to the terminal unit 110 of the third embodiment, the resistance can be reduced, and even if a large current flows, the heat can be reduced.

[0065] Above, use Figure 17 to Figure 22 , the structure and assembly process of the terminal unit 110 of the third embodiment have been described, but the technical scope of the present invention is not limited to the scope described in the above embodiment. Various changes or improvements can be added to the above embodiment.

[0066] For example, in the third embodiment described above, the second terminal 121 and the wire end 142a of the wire 141 are connected by crimping, but any connection means can be used as the connection means between the second terminal 121 and the wire end 142a.

[0067] The preferred embodiments of the present invention have been described above. Figure 23 to Figure 32 , a fourth embodiment to which the present invention can be applied is described.

[0068] [Fourth Embodiment] use Figure 23 to Figure 32 , a terminal unit 210 according to a fourth embodiment will be described.

[0069] like Figure 23 to Figure 26 As shown, the terminal unit 210 of the fourth embodiment includes a first terminal 211 , a second terminal 221 , and a pressing member 231 .

[0070] The first terminal 211 is a member made of a conductive metal and is formed as a plate member in a flat plate shape. Fig. 27 As shown, the back side of the first terminal 211 of the fourth embodiment is a flat first terminal side assembly surface 212. The first terminal side assembly surface 212 is a portion that contacts a ball 225 as a spherical contact described later when the first terminal 211 and the second terminal 221 are assembled.

[0071] The second terminal 221 is a component made of conductive metal. Fig.28 as well as Fig.29 As shown, the second terminal 221 of the fourth embodiment is a second terminal side assembly surface 222 having a flat plate shape on the front side, and a stranded wire installation surface 223 having a flat plate shape on the back side. The front and back sides of the second terminal 221 formed by the second terminal side assembly surface 222 and the stranded wire installation surface 223 are configured to overlap when viewed in the front-to-back direction, i.e., the Z direction. In addition, the second terminal side assembly surface 222 is a portion that is configured to face the first terminal side assembly surface 212 of the first terminal 211 when the first terminal 211 and the second terminal 221 are assembled.

[0072] In addition, if compared with reference Figure 28 to Figure 30 It is obvious that the second terminal 221 of the fourth embodiment is composed of the following structure: a second terminal body 224, which is flat and has 6 ball retaining holes 224a; 6 balls 225, which are spherical contacts received one by one in each of the 6 ball retaining holes 224a; a wire end 242a described later, which is installed on the opposite side of the second terminal side assembly surface 222 in a manner of blocking the 6 ball retaining holes 224a; and a ball pressure plate 226, which is installed on the second terminal side assembly surface 222 side in a state where the balls 225 are received in the ball retaining holes 224a, and keeps a part of the surface of the balls 225 protruding toward the first terminal 211 side. That is, as Fig.32As shown, in the second terminal 221 of the fourth embodiment, the six balls 225 are respectively accommodated in each of the six ball retaining holes 224a of the second terminal main body 224, sandwiched between the wire end 242a and the ball pressing plate 226, and are arranged in a rotatable state. In addition, a circular opening hole 226a formed with a diameter smaller than the diameter of the ball 225 is formed on the ball pressing plate 226. In addition, the depth dimension of the ball retaining hole 224a for accommodating the ball 225 is formed with a dimension smaller than the diameter of the ball 225. Therefore, a portion of the surface of the second terminal side assembly surface 222 of the six balls 225 is in a state of protruding from the opening hole 226a of the ball pressing plate 226 toward the front (+Z direction).

[0073] As described above, the wire 241 capable of conducting electricity is connected to the stranded wire mounting surface 223. For example, Fig.29 As shown in the figures, the electric wire 241 of the fourth embodiment has a stranded wire 242 formed by twisting a plurality of conductive copper wires, and is configured with an insulator 243 as a protective member covering the outer periphery of the stranded wire 242. In addition, the insulator 243 is removed from the end of the electric wire 241 on the side connected to the stranded wire mounting surface 223, and the stranded wire 242 is exposed to form an electric wire end 242a.

[0074] In the fourth embodiment, the stranded wire mounting surface 223 of the second terminal 221 and the wire end 242a of the wire 241 are connected by welding. At this time, the wire end 242a is welded in a manner covering the rear surface of the stranded wire mounting surface 223, so that the six through ball retaining holes 224a formed in the second terminal body 224 are blocked by the wire end 242a on the rear side of the second terminal body 224. Therefore, in the second terminal 221, as shown in FIG. Fig.32 As shown, six balls 225 as spherical contacts are in direct contact with the wire terminal 242a and are held in a rotatable state.

[0075] like Fig.23 as well as Fig.24 As shown, the first terminal 211 and the second terminal 221 described above can maintain the state of connecting the terminals to each other by means of a pressing member 231. The pressing member 231 is a clip-shaped member, and is formed with two plate-shaped elastic parts 232 that can apply elastic force as a pressing force to the front surface and the rear surface of the pressing member 231. Moreover, the pressing member 231 is assembled in a state where the first terminal side assembly surface 212 of the first terminal 211 and the second terminal side assembly surface 222 of the second terminal 221 are opposite to each other, so that Fig.32As shown, the first terminal side assembly surface 212 of the first terminal 211 and the six balls 225 as spherical contacts are pressed against each other by an elastic force, so that the first terminal 211 and the second terminal 221 can be connected to each other. In addition, the pressing component of the present invention can be any structure as long as it is a component that can exert a pressing force, for example, a pressing component that can use a tightening force such as a bolt.

[0076] When the first terminal 211 and the second terminal 221 are assembled, the six balls 225, which are spherical contacts held in a rotatable state, are pressed by the first terminal side assembly surface 212 of the first terminal 211 and sink into the wire end 242a. Fig.34 However, in Fig.34 In the prior art shown in , the ball (16) sandwiched between the connector terminal (12) and the other side connector terminal (21) does not directly contact the end of the wire. In addition, the figure marks involved in the description of the prior art document are distinguished from the embodiment of the present invention by adding brackets.

[0077] In this regard, in the terminal unit 210 of the fourth embodiment, as shown in FIG. Fig.32 As shown, the ball 225 is in direct contact with the wire end 242a without passing through the second terminal 221, thereby realizing a terminal unit 210 with an extremely short power path. Therefore, according to the terminal unit 210 of the fourth embodiment, the resistance can be reduced, and even if a large current flows, the heat can be reduced. In addition, since the ball 225 directly connects the first terminal 211 with the wire end 242a without passing through the second terminal 221 and sinks into the wire end 242a, a stable connection state of the contact portion can be realized.

[0078] In addition, since the wire end 242a directly contacted by the six balls 225 as spherical contacts is a flexible stranded wire 242, when the first terminal 211 and the second terminal 221 are assembled and contacted with each other, the six balls 225 are rotatably engaged in the stranded wire 242, i.e., the wire end 242a (rotating according to conditions). According to this structure, it is possible to absorb errors in the installation positions of the six balls 225, errors in the diameter size of the balls 225, manufacturing errors during assembly, etc., so that the contact resistance can be reduced by multi-point contact, and the temperature rise when a large current flows can be suppressed, so that a larger current can flow.

[0079] The structure of the terminal unit 210 according to the fourth embodiment has been described above. Next, a process of assembling the first terminal 211, the second terminal 221, and the pressing member 231 to configure the terminal unit 210 will be described.

[0080] As a process of assembling the first terminal 211, the second terminal 221, and the pressing member 231 to form the terminal unit 210, for example, refer to Fig.25 To explain, first, the first terminal side assembly surface 212 of the first terminal 211 is moved in the backward direction (-Z direction) toward the second terminal side assembly surface 222 of the second terminal 221, so that the six balls 225 of the second terminal 221 are in contact with the first terminal side assembly surface 212 of the first terminal 211. From this state, the pressing member 231 is moved downward (-Y direction), and the first terminal 211 and the second terminal 221 are clamped by the two plate-shaped elastic parts 232, thereby achieving Fig.23 In the process of achieving this state, the six balls 225 are rotatably engaged in the stranded wire 242, i.e., the wire end 242a, by the pressing force formed by the elastic force applied by the two plate-shaped elastic parts 232 of the pressing member 231. Therefore, in the state where the first terminal side assembly surface 212 of the first terminal 211 and the second terminal side assembly surface 222 of the second terminal 221 are opposite to each other, the first terminal 211 and the second terminal 221 are stably assembled.

[0081] In addition, if Fig.32 As shown, since the first terminal 211 and the second terminal 221 are in a state where the first terminal side assembly surface 212 of the first terminal 211 is connected to the wire end 242a only via the six balls 225 as spherical contacts, a terminal unit 210 having an extremely short current path is realized. Therefore, according to the terminal unit 210 of the fourth embodiment, the resistance can be reduced, and even if a large current flows, the heat can be reduced.

[0082] Above, use Figure 23 to Figure 32 , the structure and assembly process of the terminal unit 210 of the fourth embodiment have been described, but the technical scope of the present invention is not limited to the scope described in the above embodiment. Various changes or improvements can be added to the above embodiment.

[0083] For example, in the above-mentioned fourth embodiment, the case where the stranded wire mounting surface 223 of the second terminal 221 and the wire end 242a of the wire 241 are connected by welding is illustrated, but for welding as the connecting means, in addition to the unit that uses heat to join the stranded wire mounting surface 223 of the second terminal 221 and the wire end 242a of the wire 241 at the molecular level, all connecting means included in the definition of welding such as soldering, welding, etc. can be used.

[0084] In addition, for example, in the terminal units 10, 110, 210 of the first to fourth embodiments described above, the following structural example is shown, in which six protrusion contacts 13, 113 and ball 225 are arranged as contacts that directly contact the wire ends 42a, 142a, 242a, but regarding the number of contacts (protrusion contacts, ball contacts) that can be applied to the present invention, any number of more than one can be selected.

[0085] In addition, for example, in the terminal units 10, 110, 210 of the first to fourth embodiments described above, the lengths of the illustrated wires 41, 141, 241 are depicted as shorter according to the range of the drawings, but the length of the wires used in the terminal unit of the present invention can be set to any length.

[0086] It is obvious from the description of the claims that aspects to which such changes or improvements are added are also included in the technical scope of the present invention.

[0087] Furthermore, the terminal unit of the present invention can be used, for example, in a location in a vehicle that handles a large current.

Claims

1. A terminal unit comprising: a first terminal; a second terminal connected to an end of an electric wire and assembled and connected to the first terminal; and a pressing member that presses the first terminal and the second terminal to contact each other, characterized in that: The first terminal has one or more protruding contacts protruding in a direction perpendicular to a first terminal side assembly surface to which the second terminal is assembled. The second terminal has one or more through holes that allow the end of the electric wire to be visible from the second terminal side assembly surface where the first terminal is assembled. When the first terminal and the second terminal are assembled and pressed into contact by the pressing member, the protruding contact of the first terminal directly contacts the end of the electric wire through the through hole of the second terminal.

2. A terminal unit comprising a first terminal and a second terminal connected to an end of an electric wire and assembled and connected to the first terminal, characterized in that: The first terminal is a cylindrical elastic sleeve. The second terminal is a round pin, The elastic sleeve constituting the first terminal has one or more protruding contact points protruding toward the second terminal side when the first terminal and the second terminal are assembled. The round pin constituting the second terminal has one or more through holes through which the end of the electric wire can be visually seen. When the first terminal and the second terminal are assembled and in contact with each other, the protruding contact of the first terminal directly contacts the end of the electric wire through the through hole of the second terminal.

3. The terminal unit according to claim 1 or 2, characterized in that: The ends of the wires are flexible stranded wires. When the first terminal and the second terminal are assembled and contacted with each other, the protruding contact point of the first terminal is sunk into the stranded wire.

4. The terminal unit according to claim 1, characterized in that: The first terminal side assembly surface of the first terminal and the second terminal side assembly surface of the second terminal are both in the shape of a flat plate. The second terminal and the wire end are connected by welding, One or more of the protruding contacts of the first terminal has a quadrilateral protruding shape, The at least one through hole of the second terminal has a through-hole shape that is a quadrilateral corresponding to the quadrilateral of the protruding contact point. The one or more protruding contacts of the first terminal directly contact the electric wire end through the one or more through holes of the second terminal.

5. The terminal unit according to claim 1, characterized in that: The first terminal side assembly surface of the first terminal and the second terminal side assembly surface of the second terminal are both in the shape of a flat plate. The second terminal and the wire end are connected by crimping, One or more of the protruding contacts of the first terminal has a quadrilateral protruding shape, The at least one through hole of the second terminal has a through-hole shape that is a quadrilateral corresponding to the quadrilateral of the protruding contact point. The one or more protruding contacts of the first terminal directly contact the electric wire end through the one or more through holes of the second terminal.

6. A terminal unit comprising: a first terminal; a second terminal connected to an end of an electric wire and assembled and connected to the first terminal; and a pressing member that presses the first terminal and the second terminal to contact each other, characterized in that: The first terminal has a first terminal side assembly surface for assembling the second terminal, and the first terminal side assembly surface is in a flat plate shape. The second terminal has one or more ball contacts rotatably held relative to a second terminal side assembly surface on which the first terminal is assembled. When the first terminal and the second terminal are assembled and pressed into contact by the pressing component, the ball contact of the second terminal directly contacts the first terminal side assembly surface of the flat-plate-shaped first terminal and directly contacts the end of the wire connected to the second terminal.

7. The terminal unit according to claim 6, characterized in that: The one or more ball contacts of the second terminal are spherical balls, and The ball as the spherical contact is rotatably held by: a ball retaining hole formed in the second terminal; The wire end is mounted on the opposite side of the second terminal side assembly surface in a manner to block the ball holding hole; as well as A ball retainer is mounted on the second terminal side assembly surface side in a state where the ball is accommodated in the ball retaining hole, and retains a state where a portion of the surface of the ball protrudes toward the first terminal side.

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