JP7244262B2 - Aluminum wire connection method and aluminum wire connection structure - Google Patents

Aluminum wire connection method and aluminum wire connection structure Download PDF

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JP7244262B2
JP7244262B2 JP2018222133A JP2018222133A JP7244262B2 JP 7244262 B2 JP7244262 B2 JP 7244262B2 JP 2018222133 A JP2018222133 A JP 2018222133A JP 2018222133 A JP2018222133 A JP 2018222133A JP 7244262 B2 JP7244262 B2 JP 7244262B2
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aluminum
wires
core wire
aluminum core
electric wires
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JP2020089120A (en
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和彦 吉江
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Yazaki Corp
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Description

本発明は、アルミ電線の接続方法及びアルミ電線の接続構造に関する。 The present invention relates to a method of connecting aluminum wires and a structure for connecting aluminum wires.

例えば、電線の端末接合部を熱収縮チューブで被覆した電線の止水構造として、特許文献１に開示されたものがある。この電線の止水構造は、図７に示すように、電線１の端末の絶縁被覆２から露出した芯線３の複数の素線３ａを超音波溶接で一体にして芯線溶接部Ａを形成し、この芯線溶接部Ａを圧着端子５の芯線バレル５ａで加締め圧着すると共に、電線１の絶縁被覆２を圧着端子５の絶縁被覆バレル５ｂで加締め圧着し、これら芯線溶接部Ａから電線１の絶縁被覆２にかけて止水剤が封入された熱収縮チューブ６で被覆してある。 For example, Japanese Patent Application Laid-Open No. 2002-300002 discloses a water cutoff structure for electric wires in which terminal joints of the electric wires are covered with a heat-shrinkable tube. As shown in FIG. 7, the water stop structure of the electric wire is obtained by integrating a plurality of strands 3a of the core wire 3 exposed from the insulating coating 2 at the end of the electric wire 1 by ultrasonic welding to form a core wire welded portion A, The core wire welded portion A is crimped by the core wire barrel 5a of the crimp terminal 5, and the insulation coating 2 of the wire 1 is crimped by the insulation coating barrel 5b of the crimp terminal 5. The insulating coating 2 is covered with a heat-shrinkable tube 6 in which a waterproofing agent is enclosed.

特開２０１１－８１９１８号公報JP 2011-81918 A 国際公開第２００６／１２９４７７号パンフレットWO 2006/129477 pamphlet

しかしながら、前記従来の電線の止水構造では、図７に示すように、熱収縮チューブ６が圧着端子５の電線突き出し部Ｂを覆っていないため、止水が不完全であった。 However, as shown in FIG. 7, in the conventional water-stopping structure for electric wires, since the heat-shrinkable tube 6 does not cover the wire projecting portion B of the crimp terminal 5, water-stopping is incomplete.

これに対処するに、図８に示すように、圧着端子５の電線突き出し部Ｂまでも熱収縮チューブ６で覆ったものが開発されているが、アルミ電線のアルミ芯線を圧着端子で圧着接続する場合には、アルミ芯線を構成する複数のアルミ素線の表面に発生する酸化皮膜を除去しなければならないため、既存の設備で簡単に圧着接続できるアルミ電線の接続技術の開発が所望されている。 In order to cope with this problem, as shown in FIG. 8, a crimp terminal 5 which is covered with a heat-shrinkable tube 6 even to the electric wire projecting portion B has been developed. In such a case, it is necessary to remove the oxide film generated on the surface of the multiple aluminum wires that make up the aluminum core wire. .

そこで、本発明は、前記した課題を解決すべくなされたものであり、既存の端子と既存の設備を使用して、簡単かつ確実にアルミ芯線を接続することができると共に、電食とガルバニック腐食を抑制することができるアルミ電線の接続方法及びアルミ電線の接続構造を提供することを目的とする。 SUMMARY OF THE INVENTION Accordingly, the present invention has been made to solve the above-described problems, and it is possible to easily and reliably connect aluminum core wires using existing terminals and existing equipment, and to prevent electrolytic corrosion and galvanic corrosion. An object of the present invention is to provide an aluminum electric wire connection method and an aluminum electric wire connection structure capable of suppressing the

本発明は、絶縁被覆から露出したアルミ芯線を有する少なくとも２本のアルミ電線の各アルミ芯線同士を接続するアルミ電線の接続方法であって、前記少なくとも２本のアルミ電線の各絶縁被覆から露出した各アルミ芯線を超音波溶接または超音波アルミハンダで単線化してアルミ芯線接合部をそれぞれ直方体状に形成し、前記直方体状の各アルミ芯線接合部を突き合わさるように重ねた状態でジョイント端子で圧着した後で、前記ジョイント端子と該ジョイント端子で圧着された各アルミ芯線接合部の圧着接続部の近傍の各絶縁被覆を含めた該圧着接続部のすべてを熱収縮チューブで覆うことを特徴とする。 The present invention is a method for connecting aluminum electric wires for connecting aluminum core wires of at least two aluminum electric wires each having an aluminum core wire exposed from an insulating coating, wherein the aluminum electric wire is exposed from each insulating coating of the at least two aluminum electric wires. Each aluminum core wire is made into a single wire by ultrasonic welding or ultrasonic aluminum soldering, each aluminum core wire joint is formed into a rectangular parallelepiped shape , and the aluminum core wire joints of the rectangular parallelepiped shape are overlapped so as to face each other and crimped with a joint terminal. After that, the joint terminal and all of the crimped connection including the insulating coating in the vicinity of the crimped connection of each aluminum core wire joint crimped by the joint terminal are covered with a heat-shrinkable tube. .

また、本発明は、絶縁被覆から露出したアルミ芯線を有する少なくとも２本のアルミ電線の各アルミ芯線同士を接続するアルミ電線の接続構造であって、前記少なくとも２本のアルミ電線の各絶縁被覆から露出した各アルミ芯線に超音波溶接または超音波アルミハンダしたアルミ芯線接合部をそれぞれ直方体状に設け、前記直方体状の各アルミ芯線接合部を突き合わさるように重ねてジョイント端子で圧着した状態で、前記各アルミ芯線接合部を露出させた前記少なくとも２本のアルミ電線の各絶縁被覆間を熱収縮チューブで被覆したことを特徴とする。 The present invention also provides an aluminum electric wire connection structure for connecting aluminum core wires of at least two aluminum electric wires having aluminum core wires exposed from an insulating coating, wherein the aluminum electric wires are connected from the insulating coating of the at least two aluminum electric wires. Aluminum core wire joints ultrasonically welded or ultrasonically soldered to each exposed aluminum core wire are provided in a rectangular parallelepiped shape . A heat-shrinkable tube is provided between the insulation coatings of the at least two aluminum electric wires with the aluminum core wire joint portions exposed.

本発明によれば、少なくとも２本のアルミ電線の各絶縁被覆から露出した各アルミ芯線を超音波溶接で接合した直方体状のアルミ芯線接合部同士を突き合わさるように重ねてジョイント端子で圧着した後で、ジョイント端子と各アルミ芯線接合部の圧着接続部の近傍の各絶縁被覆を含めた該圧着接続部のすべてを熱収縮チューブで覆うことにより、既存の端子と既存の設備を使用して、簡単かつ確実にアルミ芯線を接続することができると共に、電食とガルバニック腐食を抑制することができる。 According to the present invention, the rectangular parallelepiped aluminum core wire joints obtained by joining the aluminum core wires exposed from the insulation coatings of at least two aluminum electric wires by ultrasonic welding are overlapped so as to face each other and crimped with a joint terminal. Then, by covering all of the crimped connection including the insulation coating near the crimped connection of the joint terminal and each aluminum core wire joint with a heat shrinkable tube, using the existing terminal and existing equipment, The aluminum core wire can be easily and reliably connected, and electrolytic corrosion and galvanic corrosion can be suppressed.

本発明の第１実施形態のアルミ電線の圧着前の状態を示す斜視図である。1 is a perspective view showing a state before crimping an aluminum electric wire according to a first embodiment of the present invention; FIG. 上記アルミ電線の圧着後の状態を示す斜視図である。It is a perspective view which shows the state after crimping of the said aluminum electric wire. 上記アルミ電線の圧着後に熱収縮チューブで覆った状態を示す斜視図である。FIG. 4 is a perspective view showing a state in which the aluminum electric wire is covered with a heat-shrinkable tube after being crimped. 本発明の第２実施形態のアルミ電線の圧着前の状態を示す斜視図である。FIG. 7 is a perspective view showing a state before crimping of the aluminum electric wire according to the second embodiment of the present invention; 上記第２実施形態のアルミ電線の圧着後の状態を示す斜視図である。It is a perspective view which shows the state after crimping of the aluminum electric wire of the said 2nd Embodiment. 上記第２実施形態のアルミ電線の圧着後に熱収縮チューブで覆った状態を示す斜視図である。It is a perspective view which shows the state covered with the heat-shrinkable tube after crimping|bonding the aluminum electric wire of the said 2nd Embodiment. 従来の電線の止水構造の斜視図である。FIG. 2 is a perspective view of a conventional water cutoff structure for electric wires; 他の従来の電線の止水構造の斜視図である。FIG. 11 is a perspective view of another conventional water cutoff structure for electric wires;

以下、本発明の実施形態を図面に基づいて説明する。 BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings.

図１は本発明の第１実施形態のアルミ電線の圧着前の状態を示す斜視図、図２はアルミ電線の圧着後の状態を示す斜視図、図３はアルミ電線の圧着後に熱収縮チューブで覆った状態を示す斜視図である。 FIG. 1 is a perspective view showing the state before crimping of the aluminum electric wire according to the first embodiment of the present invention, FIG. 2 is a perspective view showing the state after crimping of the aluminum electric wire, and FIG. It is a perspective view which shows the covered state.

図１に示すように、この第１実施形態では、アルミ電線１０の一端側の絶縁被覆１１を剥ぎ取って太物のアルミ芯線（導体）１２を露出させた既存の２本の電線及びそれらのアルミ芯線１２，１２同士を圧着する圧着接合端子として既存のジョイント端子２０を用意し、２本のアルミ電線１０，１０の各アルミ芯線１２の複数の素線１２ａ同士を、既存の図示しない超音波溶接機または超音波アルミハンダ槽で接合してアルミ芯線接合部１２Ａを形成し、この各アルミ芯線接合部１２Ａ，１２Ａ同士をジョイント端子２０で圧着する。即ち、２本のアルミ電線１０，１０の各アルミ芯線１２の複数の素線１２ａ間にホーンによる超音波振動エネルギを伝播させ、複数の素線１２ａの表面のアルミ酸化皮膜を破壊、除去することにより、直方体状のアルミ芯線接合部１２Ａをそれぞれ形成し、この直方体状の各アルミ芯線接合部１２Ａ，１２Ａ同士をＵ字板状のジョイント端子２０で既存の図示しないクリンパやアンビル等から成る加締め金型を用いて加締め圧着により圧着接続する。 As shown in FIG. 1, in this first embodiment, two existing electric wires with the thick aluminum core wire (conductor) 12 exposed by stripping the insulating coating 11 on one end side of the aluminum electric wire 10 and their An existing joint terminal 20 is prepared as a crimp joint terminal for crimping the aluminum core wires 12, 12, and a plurality of strands 12a of the aluminum core wires 12 of the two aluminum electric wires 10, 10 are connected to each other by an existing ultrasonic wave (not shown). The aluminum core wire joints 12A are formed by joining using a welding machine or an ultrasonic aluminum solder bath, and the aluminum core wire joints 12A, 12A are crimped to each other with a joint terminal 20. FIG. That is, the ultrasonic vibration energy from the horn is propagated between the plurality of wire strands 12a of the aluminum core wires 12 of the two aluminum electric wires 10, 10 to destroy and remove the aluminum oxide film on the surface of the plurality of wire strands 12a. Then, the rectangular parallelepiped aluminum core wire joints 12A are formed, and the rectangular parallelepiped aluminum core wire joints 12A, 12A are crimped by a U-shaped plate-shaped joint terminal 20 using an existing crimper, anvil, etc. (not shown). Crimping connection is performed by caulking and crimping using a mold.

また、２本のアルミ電線１０，１０の各アルミ電線１０の接合するアルミ芯線１２の材質は、アルミニウム製、アルミニウム合金製であり、撚り線でも単芯線であっても良く、また、ジョイント端子２０は、銅製、銅合金製、銅に錫めっきしたもの等であり、この場合、ジョイント端子２０と接触する裸のアルミ芯線１２の部分は、異種金属接触腐食（ガルバニック腐食）によって電食（防食）し易い。したがって、この裸のアルミ芯線１２のアルミ芯線接合部１２Ａの部分が露出するジョイント端子２０の周りの露出端の絶縁被覆１１を含めた周囲を、図３に示すように、止水剤を封入または封入せずに熱収縮チューブ３０で覆って電食とガルバニック腐食を防止するものである。 The material of the aluminum core wire 12 to which each aluminum wire 10 of the two aluminum wires 10, 10 is joined is made of aluminum or an aluminum alloy, and may be a stranded wire or a single core wire. is made of copper, copper alloy, copper plated with tin, etc. In this case, the portion of the bare aluminum core wire 12 in contact with the joint terminal 20 is electrolytically corroded (anti-corrosion) by galvanic corrosion. easy to do Accordingly, as shown in FIG. It is intended to prevent electrolytic corrosion and galvanic corrosion by covering with a heat-shrinkable tube 30 without encapsulation.

尚、２本のアルミ電線１０，１０の他端側に露出した図示しない各アルミ芯線には、相手側端子に電気的に接続される図示しない圧着端子等の端子を接続してある。 A terminal such as a crimp terminal (not shown) electrically connected to a mating terminal is connected to each aluminum core wire (not shown) exposed at the other end of the two aluminum electric wires 10,10.

次に、前記第１実施形態の２本のアルミ電線１０，１０の接続方法（絶縁被覆１１から露出したアルミ芯線１２を有する２本のアルミ電線１０，１０の各アルミ芯線１２，１２同士を接続する方法）を説明すると、まず、図１に示すように、２本のアルミ電線１０，１０の各絶縁被覆１１から露出した各アルミ芯線１２を、既存の超音波溶接機または超音波アルミハンダ槽で接合してアルミ芯線接合部１２Ａをそれぞれ形成する。 Next, the connection method of the two aluminum electric wires 10, 10 of the first embodiment (the aluminum core wires 12, 12 of the two aluminum electric wires 10, 10 having the aluminum core wires 12 exposed from the insulating coating 11 are connected) First, as shown in FIG. 1, each aluminum core wire 12 exposed from each insulation coating 11 of two aluminum electric wires 10, 10 is welded by an existing ultrasonic welding machine or an ultrasonic aluminum solder bath. to form the aluminum core wire joint portions 12A.

そして、図２に示すように、２本のアルミ電線１０，１０の各アルミ芯線接合部１２Ａ，１２Ａを突き合わさるように重ねた状態で加締め金型を介してジョイント端子２０により加締め圧着する。 Then, as shown in FIG. 2, the aluminum core wire joint portions 12A, 12A of the two aluminum electric wires 10, 10 are crimped by a joint terminal 20 through a crimping die in a state of being overlapped so as to face each other. .

この各アルミ芯線接合部１２Ａ，１２Ａをジョイント端子２０で加締め圧着した後で、図３に示すように、ジョイント端子２０と該ジョイント端子２０で加締め圧着された各アルミ芯線接合部１２Ａ，１２Ａの圧着接続部Ｓの近傍の各絶縁被覆１１，１１を含めた圧着接続部Ｓのすべてを熱収縮チューブ３０で覆い、所定温度で加熱して熱収縮チューブ３０を収縮させて隙間なく一体に密着させる。この際、電食のレベルにより、止水剤無しまたは止水剤を封入した熱収縮チューブ３０で覆っても良い。 After crimping the aluminum core wire joints 12A and 12A with the joint terminal 20, as shown in FIG. All of the crimp connection S including the insulating coatings 11, 11 in the vicinity of the crimp connection S is covered with a heat-shrinkable tube 30, heated at a predetermined temperature to shrink the heat-shrinkable tube 30, and tightly adhere integrally without gaps. Let At this time, depending on the level of electrolytic corrosion, it may be covered with a heat-shrinkable tube 30 without a water-stopping agent or with a water-stopping agent enclosed therein.

このように、既存の端子であるジョイント端子２０と、既存の設備である超音波溶接機、超音波アルミハンダ槽及びクリンパやアンビル等から成る加締め金型を使用して、２本のアルミ電線１０，１０の各アルミ芯線１２，１２同士をジョイント端子２０で簡単かつ強固に圧着接続することができる。これにより、ジョイント端子２０を介して圧着接続された長尺のアルミ電線１０を低コストで製造することができる。 In this way, two aluminum electric wires are connected by using a joint terminal 20, which is an existing terminal, and a crimping mold including an ultrasonic welding machine, an ultrasonic aluminum solder bath, a crimper, an anvil, etc., which are existing equipment. The aluminum core wires 12, 12 of 10, 10 can be easily and firmly crimp-connected by the joint terminal 20. - 特許庁Thereby, the long aluminum electric wire 10 crimp-connected via the joint terminal 20 can be manufactured at low cost.

また、２本のアルミ電線１０，１０の各絶縁被覆１１から露出した各アルミ芯線１２，１２に超音波溶接したアルミ芯線接合部１２Ａ，１２Ａをそれぞれ設け、各アルミ芯線接合部１２Ａ，１２Ａをジョイント端子２０で加締め圧着した状態で、各アルミ芯線接合部１２Ａ，１２Ａを露出させた２本のアルミ電線１０，１０の各絶縁被覆１１，１１間を熱収縮チューブ３０で被覆したアルミ電線の接続構造Ａでは、完全止水ではなく、ジョイント端子２０による各アルミ芯線接合部１２Ａ，１２Ａの圧着接続部Ｓの電食とガルバニック腐食を確実に抑制することができる。 In addition, aluminum core wire joints 12A, 12A ultrasonically welded to the aluminum core wires 12, 12 exposed from the respective insulating coatings 11 of the two aluminum electric wires 10, 10 are provided, respectively, and the aluminum core wire joints 12A, 12A are jointed. Connection of aluminum wires covered with a heat-shrinkable tube 30 between insulation coatings 11, 11 of two aluminum wires 10, 10 exposing respective aluminum core wire joints 12A, 12A in a state crimped with a terminal 20. In the structure A, the joint terminal 20 can reliably suppress electrolytic corrosion and galvanic corrosion of the crimped connection portions S of the aluminum core wire joint portions 12A, 12A instead of completely stopping water.

図４は本発明の第２実施形態のアルミ電線の圧着前の状態を示す斜視図、図５はアルミ電線の圧着後の状態を示す斜視図、図６はアルミ電線の圧着後に熱収縮チューブで覆った状態を示す斜視図である。 FIG. 4 is a perspective view showing the state before crimping of the aluminum electric wire according to the second embodiment of the present invention, FIG. 5 is a perspective view showing the state after crimping of the aluminum electric wire, and FIG. It is a perspective view which shows the covered state.

この第２実施形態の２本のアルミ電線１０，１０の接続方法では、図４と図５に示すように、２本のアルミ電線１０，１０の各アルミ芯線１２を同じ向きで重ね合わせて圧着接続する点が、前記第１実施形態とは異なる。尚、他の構成は、前記第１実施形態と同様であるため、同一構成部分には同一符号を付して詳細な説明は省略する。 In the method of connecting two aluminum electric wires 10, 10 according to the second embodiment, as shown in FIGS. 4 and 5, the aluminum core wires 12 of the two aluminum electric wires 10, 10 are overlapped in the same direction and crimped. The point of connection is different from that of the first embodiment. Since the rest of the configuration is the same as that of the first embodiment, the same components are denoted by the same reference numerals, and detailed description thereof will be omitted.

この第２実施形態では、図６に示すように、２本のアルミ電線１０，１０の各アルミ芯線接合部１２ａ，１２Ａを同じ向きで重ね合わせた状態でジョイント端子２０により加締め圧着により圧着接続し、ジョイント端子２０と該ジョイント端子２０で加締め圧着された各アルミ芯線接合部１２Ａ，１２Ａの圧着接続部Ｓの近傍の各絶縁被覆１１，１１を含めた圧着接続部Ｓのすべてを熱収縮チューブ３０で覆うことにより、前記第１実施形態と同様の作用・効果を奏する。 In this second embodiment, as shown in FIG. 6, aluminum core wire joint portions 12a and 12A of two aluminum electric wires 10 and 10 are overlapped in the same direction and crimped and connected by crimping with a joint terminal 20. Then, the joint terminal 20 and the aluminum core wire joints 12A crimped by the joint terminal 20 and the insulation coatings 11 in the vicinity of the crimp connection S are all of the crimp connection S including the heat shrinkage. By covering with the tube 30, the same functions and effects as those of the first embodiment can be obtained.

尚、前記各実施形態によれば、２本のアルミ電線のアルミ芯線同士をジョイント端子で圧着接続するようにしたが、３本以上のアルミ電線のアルミ芯線同士をジョイント端子で圧着接続するようにしても良い。 According to each of the above-described embodiments, the aluminum core wires of two aluminum electric wires are crimped to each other by a joint terminal, but the aluminum core wires of three or more aluminum electric wires are crimped to each other by a joint terminal. can be

１０，１０ ２本のアルミ電線
１１ 絶縁被覆
１２ アルミ芯線
１２Ａ アルミ芯線接合部
２０ ジョイント端子
３０ 熱収縮チューブ
Ａ アルミ電線の接続構造
Ｓ 圧着接続部 REFERENCE SIGNS LIST 10, 10 Two aluminum wires 11 Insulation coating 12 Aluminum core wire 12A Aluminum core wire joint 20 Joint terminal 30 Heat-shrinkable tube A Aluminum wire connection structure S Crimp connection

Claims (3)

絶縁被覆から露出したアルミ芯線を有する少なくとも２本のアルミ電線の各アルミ芯線同士を接続するアルミ電線の接続方法であって、
前記少なくとも２本のアルミ電線の各絶縁被覆から露出した各アルミ芯線を超音波溶接または超音波アルミハンダしてアルミ芯線接合部をそれぞれ直方体状に形成し、
前記直方体状の各アルミ芯線接合部を突き合わさるように重ねた状態でジョイント端子で圧着した後で、前記ジョイント端子と該ジョイント端子で圧着された各アルミ芯線接合部の圧着接続部の近傍の各絶縁被覆を含めた該圧着接続部のすべてを熱収縮チューブで覆うことを特徴とするアルミ電線の接続方法。 A method of connecting aluminum electric wires for connecting aluminum core wires of at least two aluminum electric wires having aluminum core wires exposed from an insulating coating,
The aluminum core wires exposed from the respective insulation coatings of the at least two aluminum electric wires are ultrasonically welded or ultrasonically aluminum soldered to form aluminum core wire joints in a rectangular parallelepiped shape ,
After crimping the rectangular parallelepiped aluminum core wire joints with a joint terminal in a state of overlapping each other so as to face each other, the joint terminal and each aluminum core wire joint crimped by the joint terminal in the vicinity of the crimp connection part A method of connecting aluminum electric wires, characterized in that the entire crimp connection including the insulating coating is covered with a heat-shrinkable tube. 請求項１記載のアルミ電線の接続方法であって、
前記少なくとも２本のアルミ電線の直方体状の各アルミ芯線接合部を突き合わさるように重ねた状態で前記ジョイント端子により加締め圧着することを特徴とするアルミ電線の接続方法。 The aluminum electric wire connection method according to claim 1,
A method for connecting aluminum electric wires, characterized in that the rectangular parallelepiped aluminum core wire joints of the at least two aluminum electric wires are overlapped so as to face each other and crimped by the joint terminal. 絶縁被覆から露出したアルミ芯線を有する少なくとも２本のアルミ電線の各アルミ芯線同士を接続するアルミ電線の接続構造であって、
前記少なくとも２本のアルミ電線の各絶縁被覆から露出した各アルミ芯線に超音波溶接または超音波アルミハンダしたアルミ芯線接合部をそれぞれ直方体状に設け、
前記直方体状の各アルミ芯線接合部を突き合わさるように重ねてジョイント端子で圧着した状態で、前記各アルミ芯線接合部を露出させた前記少なくとも２本のアルミ電線の各絶縁被覆間を熱収縮チューブで被覆したことを特徴とするアルミ電線の接続構造。 An aluminum electric wire connection structure for connecting aluminum core wires of at least two aluminum electric wires having aluminum core wires exposed from an insulating coating,
Each aluminum core wire exposed from each insulation coating of the at least two aluminum electric wires is provided with an aluminum core wire joint ultrasonically welded or ultrasonically soldered in a rectangular parallelepiped shape ,
A heat-shrinkable tube is inserted between the insulating coatings of the at least two aluminum electric wires with the aluminum core wire joints exposed, in a state where the rectangular parallelepiped aluminum core wire joints are overlapped so as to face each other and crimped with a joint terminal. An aluminum electric wire connection structure characterized by being covered with.
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