JP2017220294A - Wire with terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wire with terminal having high corrosion resistance, capable of effectively suppressing progression rate of galvanic corrosion occurring between copper and aluminum.SOLUTION: A wire with terminal 1 includes: a wire 20 having a core wire 22 composed of aluminum or aluminum alloy, and an insulation coating 24 covering the core wire 22; a terminal 10 composed of copper or copper alloy; and an additional member 30 composed of aluminum or aluminum alloy. The additional member 30 is attached to the end of the wire 20. The wire 20 has, at the end thereof, a core wire exposure part 23 where the core wire 22 is exposed from the insulation coating 24. The terminal 10 is connected electrically with the core wire exposure part 23. The additional member 30 has a coating enclosure 34 enclosing the insulation coating 24 of the wire 20, and a connection 32 connected electrically with the core wire exposure part 23.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an electric wire with a terminal, and more particularly to an electric wire with a terminal in which a terminal is connected to an end portion of the electric wire.

  The development of hybrid cars and electric cars has become active in order to meet exhaust gas regulations that are becoming stricter year by year. In a hybrid car or an electric vehicle, since it is necessary to extract a large amount of power from a battery, a wire having a diameter larger than that of a conventional wire is used. Thus, the use of large-diameter electric wires and batteries tends to increase the weight of hybrid cars and electric vehicles, and a reduction in the weight of the vehicle body is required in order to improve fuel consumption.

  With such a demand, weight reduction is demanded also for the wire harness which is one part constituting the automobile. For this reason, lightweight aluminum is increasingly used as a material for a conductor (core wire) of an electric wire in a wire harness. On the other hand, copper having excellent conductivity and economy is often used as a material for terminals connected to such electric wires.

  However, when an aluminum core wire and a copper terminal are electrically connected, if an electrolytic solution such as water adheres to this connection portion due to rainwater, car washing, condensation, etc., the aluminum core wire and the copper terminal are interposed via the electrolytic solution. A battery circuit is formed, and a phenomenon (galvanic corrosion) occurs in which aluminum, which is an electrochemically base metal, is eluted into the electrolyte and corroded.

  In general, it is known that the progress speed of such galvanic corrosion depends on a difference in standard electrode potential between different metals electrically connected to each other, a surface area ratio between different metals, a circuit resistance, and the like. . Among these, it is said that the surface area ratio between different metals occupies a particularly large weight. For this reason, it is said that as the surface area of a base metal such as aluminum is increased with respect to the surface area of an electrochemically noble metal such as copper, the progress speed of galvanic corrosion is reduced.

  From this point of view, most of the copper terminals are tin-plated, leaving the connection with the aluminum conductor, and the exposed area of copper, an electrochemically noble metal, is minimized to suppress the progression of galvanic corrosion. The technique to do is known (for example, refer patent document 1).

  However, tin used in the technique disclosed in Patent Document 1 is a metal that is electrochemically more noble than aluminum, so even if tin plating is applied to the majority of terminals, it is more electrochemical than aluminum. In addition, the surface area of copper and tin, which are noble metals, does not change as a whole and is not a fundamental solution. Therefore, with the technique disclosed in Patent Document 1, there is a possibility that the progress speed of galvanic corrosion cannot be sufficiently suppressed.

JP 2009-277664 A

  The present invention has been made in view of such problems of the prior art, and has a highly corrosion-resistant terminal capable of effectively suppressing the progress rate of galvanic corrosion occurring between copper and aluminum. The purpose is to provide electric wires.

  According to the first aspect of the present invention, there is provided a terminal-attached electric wire with high corrosion resistance that can effectively suppress the progress rate of galvanic corrosion that occurs between copper and aluminum. The electric wire with terminal includes an electric wire having a core wire made of aluminum or an aluminum alloy, an insulating coating that covers the core wire, a terminal made of copper or a copper alloy, and an additional member made of aluminum or an aluminum alloy. . The additional member is attached to the end of the electric wire. The said electric wire has the core wire exposure part which the said core wire exposes from the said insulation coating in the edge part. The terminal is electrically connected to the core wire exposed portion. The additional member includes a coating surrounding portion that surrounds the insulating coating of the electric wire, and a connection portion that is electrically connected to the core wire exposed portion.

  As described above, since the additional member made of aluminum or aluminum alloy is electrically connected to the exposed core portion, the surface area of the aluminum member connected to the terminal made of copper or copper alloy is divided by the surface area of the additional member. Can only be increased. Therefore, the surface area of aluminum which is a base metal can be increased with respect to copper which is an electrochemically noble metal, and the progress speed of galvanic corrosion in the electric wire with terminal can be effectively suppressed. Moreover, since the covering surrounding part of the additional member surrounds the insulating coating of the electric wire, the strength of the electric wire with terminal against the force (peeling force) for peeling the electric wire from the terminal and the additional member is improved.

  According to the 2nd aspect of this invention, the electric wire with a terminal with high corrosion resistance which can suppress effectively the progress speed of the galvanic corrosion which arises between copper and aluminum is provided. This electric wire with a terminal includes an electric wire having a core wire made of aluminum or an aluminum alloy, an insulating coating that covers the core wire, a terminal made of copper or a copper alloy, and an additional member made of aluminum or an aluminum alloy. The additional member is attached to the electric wire. The said electric wire has the core wire exposure part which the said core wire exposes from the said insulation coating in the edge part. The terminal is electrically connected to the core wire exposed portion. The additional member includes a connecting portion that surrounds the core wire exposed portion and is electrically connected to the core wire exposed portion.

  As described above, since the additional member made of aluminum or aluminum alloy is electrically connected to the exposed core portion, the surface area of the aluminum member connected to the terminal made of copper or copper alloy is divided by the surface area of the additional member. Can only be increased. Therefore, the surface area of aluminum which is a base metal can be increased with respect to copper which is an electrochemically noble metal, and the progress speed of galvanic corrosion in the electric wire with terminal can be effectively suppressed.

  In this case, it is preferable that the additional member further includes a coating surrounding portion that surrounds the insulating coating of the electric wire. Thus, by surrounding the insulation coating of the electric wire by the covering enclosure portion of the additional member, the strength of the electric wire with terminal against the force (peeling force) for peeling the electric wire from the terminal and the additional member is improved.

  It is preferable that the said core wire exposed part is integrally connected with the said connection part of the said terminal and the said additional member by ultrasonic welding. By using ultrasonic welding in this way, the oxide film and dirt existing on the exposed surface of the core wire, the connecting portion of the additional member, and the terminal are removed by ultrasonic vibration, and the movement of metal atoms caused by ultrasonic vibration is performed. Causes a strong attractive force between metal atoms, and the metal atoms are bonded to each other to form a solid phase welding state. Thereby, the electrical connection between the core wire and terminal of an electric wire can be made more reliable.

  According to the present invention, since the additional member made of aluminum or aluminum alloy is electrically connected to the core wire exposed portion, the surface area of the aluminum member connected to the terminal made of copper or copper alloy is set to the surface area of the additional member. Can be increased by Therefore, the surface area of aluminum which is a base metal can be increased with respect to copper which is an electrochemically noble metal, and the progress speed of galvanic corrosion in the electric wire with terminal can be effectively suppressed. Thereby, the electric wire with a terminal with high corrosion resistance is provided.

It is a top view which shows the electric wire with a terminal in the 1st Embodiment of this invention. It is a front view of the electric wire with a terminal shown in FIG. It is the sectional view on the AA line of FIG. It is the BB sectional view taken on the line of FIG. It is a top view which shows the electric wire with a terminal in the 2nd Embodiment of this invention. It is a front view of the electric wire with a terminal shown in FIG. It is CC sectional view taken on the line of FIG. It is the DD sectional view taken on the line of FIG. It is a front view which shows the state which removed the additional member from the electric wire with a terminal of FIG. It is a top view which shows the state which removed the additional member from the electric wire with a terminal of FIG. It is a top view which shows the electric wire with a terminal in the 3rd Embodiment of this invention. It is the EE sectional view taken on the line of FIG.

  Hereinafter, embodiments of the electric wire with terminal according to the present invention will be described in detail with reference to FIGS. 1 to 12. 1 to 12, the same or corresponding components are denoted by the same reference numerals, and redundant description is omitted. In addition, in FIGS. 1 to 12, the scale and dimensions of each component are exaggerated, and some components may be omitted.

  1 is a plan view showing a terminal-equipped electric wire 1 according to a first embodiment of the present invention, FIG. 2 is a front view, FIG. 3 is a cross-sectional view taken along line AA in FIG. 1, and FIG. It is sectional drawing. As shown in FIGS. 1 to 4, the electric wire with terminal 1 in the present embodiment includes a substantially flat terminal 10 made of copper, an electric wire 20 extending along the X direction, and an addition attached to the end of the electric wire 20. Member 30.

  The electric wire 20 includes a core wire 22 composed of a plurality of strands made of aluminum, and an insulating coating 24 that covers the core wire 22. The insulation coating 24 of the electric wire 20 is removed from the end portion over a certain distance, and a core wire exposed portion 23 where the core wire 22 is exposed from the insulation coating 24 is formed at the end portion of the electric wire 20.

  The terminal 10 includes a first plate portion 14 and a second plate portion 16 with the step portion 12 interposed therebetween. The first plate portion 14 is formed with a bolt hole 15 for fastening a bolt (not shown) for fixing the connection to the terminal connection portion (not shown) of the counterpart device to which the terminal 10 is connected. Yes. The bolt hole 15 is formed so as to penetrate the first plate portion 14 in the Z direction. In addition to the bolt holes 15, the first plate portion 14 may be formed with lance locking holes for locking lances provided in corresponding terminal accommodating portions (not shown).

  The additional member 30 is made of aluminum, like the core wire 22. The additional member 30 includes a connecting portion 32 that is electrically connected to the core wire exposed portion 23 and a covering surrounding portion 34 that surrounds the insulating covering 24 of the electric wire 20. The connecting portion 32 of the additional member 30 is disposed on the second plate portion 16 of the terminal 10 and is disposed so as to be interposed between the second plate portion 16 and the core wire exposed portion 23. In FIG. 2, the upper surface of the first plate portion 14 of the terminal 10 and the upper surface of the connection portion 32 of the additional member 30 are shown to be on the same plane, but these surfaces are not necessarily on the same plane. There is no need.

  For example, by performing ultrasonic welding from above the core wire exposed portion 23 of the electric wire 20, the core wire exposed portion 23 of the electric wire 20, the connecting portion 32 of the additional member 30, and the second plate portion 16 of the terminal 10 are integrated. Fixed. By performing ultrasonic welding in this way, the oxide film and dirt existing on the surfaces of the strands constituting the core wire 22, the connection portion 32 of the additional member 30, and the second plate portion 16 of the terminal 10 are ultrasonicated. The movement of the metal atoms which is removed by the vibration and caused by the ultrasonic vibration causes a strong attractive force between the metal atoms, and the metal atoms are connected to each other to form a solid phase welding state. Thereby, the core wire exposed portion 23 of the electric wire 20 is electrically connected to the connecting portion 32 of the additional member 30 and further electrically connected to the second plate portion 16 of the terminal 10.

  The covering enclosure portion 34 of the additional member 30 is fixed around the insulating coating 24 by, for example, crimping (clamping) the crimping pieces 34A and 34B shown in FIG. Thus, since the covering surrounding portion 34 of the additional member 30 is fixed so as to surround the insulating coating 24 of the electric wire 20, a force (peeling force) for peeling the electric wire 20 from the terminal 10 and the additional member 30. The strength of the terminal-attached electric wire 1 is improved.

  As described above, since the additional member 30 made of aluminum is electrically connected to the core wire exposed portion 23 of the present embodiment, the surface area of the aluminum member connected to the terminal 10 made of copper is set to the surface of the additional member 30. It can be increased by the surface area. Therefore, the surface area of aluminum, which is a base metal, can be increased with respect to copper, which is an electrochemically noble metal, and the progress speed of galvanic corrosion in the terminal-attached electric wire 1 can be effectively suppressed.

  5 is a plan view showing a terminal-attached electric wire 101 according to the second embodiment of the present invention, FIG. 6 is a front view, FIG. 7 is a sectional view taken along the line CC in FIG. 5, and FIG. It is sectional drawing. As shown in FIGS. 5 to 8, the electric wire with terminal 101 in the present embodiment is a substantially flat terminal 110 made of copper, an electric wire 20 extending along the X direction, and an addition attached to the end of the electric wire 20. Member 130.

  9 and 10 show a state in which the additional member 130 is removed from the terminal-attached electric wire 101, FIG. 9 is a plan view, and FIG. 10 is a front view. As shown in FIGS. 9 and 10, the terminal 110 has a first plate portion 114 and a second plate portion 116 with a stepped portion 112 interposed therebetween. Bolt holes 115 for fastening connection fixing bolts (not shown) to terminal connection parts (not shown) of counterpart devices to which the terminals 110 are connected are formed in the first plate part 114. Yes. The bolt hole 115 is formed so as to penetrate the first plate portion 114 in the Z direction. In addition to the bolt holes 115, the first plate portions 114 may be formed with lance locking holes for locking lances provided in corresponding terminal accommodating portions (not shown).

  The additional member 130 is made of aluminum, like the core wire 22. As shown in FIGS. 5 to 8, the additional member 130 includes an annular connecting portion 132 that surrounds the core wire exposed portion 23, and a covering enclosure portion 134 that surrounds the insulating coating 24 of the electric wire 20. In the present embodiment, as shown in FIG. 7, the connecting portion 132 surrounds not only the core wire exposed portion 23 but also the second plate portion 116 of the terminal 110, but the terminal 110 is the connecting portion of the additional member 130. 132 does not have to be surrounded. In FIG. 6, the lower surface of the first plate portion 114 of the terminal 110 and the lower surface of the connecting portion 132 of the additional member 130 are shown to be on the same plane, but these surfaces are not necessarily on the same plane. There is no need.

  For example, ultrasonic welding is performed from above the connection portion 132 of the additional member 130 in a state where the core wire exposed portion 23 of the electric wire 20 and the second plate portion 116 of the terminal 110 are surrounded by the connection portion 132 of the additional member 130. The core wire exposed portion 23 of the electric wire 20, the second plate portion 116 of the terminal 110, and the connecting portion 132 of the additional member 130 are fixed together. Thereby, the core wire exposed portion 23 of the electric wire 20 is electrically connected to the additional member 130 and the terminal 110.

  The covering enclosure portion 134 of the additional member 130 is fixed around the insulating coating 24 by, for example, crimping (clamping) the crimping pieces 134A and 134B shown in FIG. As described above, since the covering and surrounding portion 134 of the additional member 130 is fixed so as to surround the insulating coating 24 of the electric wire 20, a force (peeling force) for peeling the electric wire 20 from the terminal 110 and the additional member 130. The strength of the terminal-attached electric wire 101 is improved.

  As described above, since the additional member 130 made of aluminum is electrically connected to the core wire exposed portion 23 of the present embodiment, the surface area of the aluminum member connected to the terminal 110 made of copper is set to the surface of the additional member 130. It can be increased by the surface area. Therefore, the surface area of aluminum, which is a base metal, can be increased with respect to copper, which is an electrochemically noble metal, and the progress speed of galvanic corrosion in the electric wire with terminal 101 can be effectively suppressed.

  FIG. 11 is a plan view showing a terminal-attached electric wire 201 according to the third embodiment of the present invention, and FIG. 12 is a cross-sectional view taken along the line EE of FIG. As shown in FIG.11 and FIG.12, the electric wire 201 with a terminal in this embodiment is the terminal 110 similar to the terminal 110 in 2nd Embodiment, the electric wire 20 extended along a X direction, and the edge part of the electric wire 20 And an additional member 230 to be attached.

  The additional member 230 is made of aluminum, like the core wire 22. The additional member 230 includes a connection portion 232 that surrounds the core wire exposed portion 23, and a covering enclosure portion 234 that surrounds the insulating coating 24 of the electric wire 20.

  The connecting portion 232 of the additional member 230 fixes the core wire exposed portion 23 to the second plate portion 116 of the terminal 110 by crimping (crimping) the crimping pieces 232A and 232B shown in FIG. At this time, in order to ensure electrical connection between the core wire exposed portion 23 and the crimping pieces 232A and 232B, for example, a minute protrusion (serration) is provided on the inner surface of the crimping pieces 232A and 232B, and the core wire exposed portion 23 is provided. The oxide film formed on the surface may be broken at the time of pressure bonding. Similarly, in order to ensure the electrical connection between the terminal 110 and the core wire exposed portion 23, for example, a minute protrusion (serration) is provided on the upper surface of the second plate portion 116 of the terminal 110, and the core wire exposed portion. The oxide film formed on the surface of 23 may be broken at the time of pressure bonding.

  The covering surrounding portion 234 of the additional member 230 is fixed around the insulating coating 24 by, for example, crimping (clamping) the crimping pieces 234A and 234B shown in FIG. Thus, since the covering surrounding portion 234 of the additional member 230 is fixed so as to surround the insulating coating 24 of the electric wire 20, a force (peeling force) for peeling the electric wire 20 from the terminal 110 and the additional member 230. The strength of the terminal-attached electric wire 201 is improved.

  As described above, since the additional member 230 made of aluminum is electrically connected to the core wire exposed portion 23 of the present embodiment, the surface area of the aluminum member connected to the terminal 110 made of copper is set to the surface of the additional member 230. It can be increased by the surface area. Therefore, the surface area of aluminum, which is a base metal, can be increased with respect to copper, which is an electrochemically noble metal, and the progress speed of galvanic corrosion in the electric wire with terminal 101 can be effectively suppressed.

  In the above-described embodiment, an example in which copper is used as the material of the terminal 10 has been described. However, a copper alloy can also be used as the material of the terminal 10. Moreover, although the example which used aluminum as a material of the core wire 22 and the additional member 30 was demonstrated, an aluminum alloy can also be used as a material of the core wire 22 and the additional member 30.

  The preferred embodiments of the present invention have been described above, but the present invention is not limited to the above-described embodiments, and it goes without saying that the present invention may be implemented in various forms within the scope of the technical idea.

DESCRIPTION OF SYMBOLS 1 Electric wire with a terminal 10 Terminal 12 Step part 14 1st board part 15 Bolt hole 16 2nd board part 20 Electric wire 22 Core wire 23 Core wire exposure part 24 Insulation coating 30 Additional member 32 Connection part 34 Covering enclosure part 34A, 34B Crimp piece 101, 201 Electric wire with terminal 110 Terminal 112 Step portion 114 First plate portion 115 Bolt hole 116 Second plate portion 130, 230 Additional member 132, 232 Connection portion 134, 234 Covering enclosure portion 134A, 134B, 232A, 232B, 234A, 234B Crimping piece

Claims (4)

An electric wire having a core wire made of aluminum or an aluminum alloy, and an insulating coating covering the core wire;
A terminal made of copper or a copper alloy;
An additional member made of aluminum or an aluminum alloy, and an additional member attached to an end of the electric wire,
The electric wire has a core wire exposed portion where the core wire is exposed from the insulating coating at an end thereof,
The terminal is electrically connected to the core wire exposed portion;
The additional member is
A coating surrounding portion surrounding the insulating coating of the electric wire;
It has a connection part electrically connected with the said core wire exposure part, The electric wire with a terminal characterized by the above-mentioned. An electric wire having a core wire made of aluminum or an aluminum alloy, and an insulating coating covering the core wire;
A terminal made of copper or a copper alloy;
An additional member made of aluminum or an aluminum alloy, the additional member attached to the electric wire;
With
The electric wire has a core wire exposed portion where the core wire is exposed from the insulating coating at an end thereof,
The terminal is electrically connected to the core wire exposed portion;
The additional member includes a connecting portion that surrounds the core wire exposed portion and is electrically connected to the core wire exposed portion.   The said additional member is an electric wire with a terminal of Claim 2 which further has a coating | coated surrounding part which surrounds the said insulation coating | cover of the said electric wire.   The said core wire exposure part is integrally connected with the said connection part of the said terminal and the said additional member by ultrasonic welding, The electric wire with a terminal as described in any one of Claim 1 to 3 characterized by the above-mentioned.

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