JP4442183B2 - Ultrasonic welding machine - Google Patents

Ultrasonic welding machine Download PDF

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JP4442183B2
JP4442183B2 JP2003351749A JP2003351749A JP4442183B2 JP 4442183 B2 JP4442183 B2 JP 4442183B2 JP 2003351749 A JP2003351749 A JP 2003351749A JP 2003351749 A JP2003351749 A JP 2003351749A JP 4442183 B2 JP4442183 B2 JP 4442183B2
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ultrasonic welding
electrode tab
heat
welding machine
clamp
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JP2005111547A (en
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明 清水
始 皆川
悦夫 大上
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Nissan Motor Co Ltd
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Description

本発明は、超音波溶接時に被溶接物から発生する熱を吸熱する吸熱手段を備えた超音波溶接機に関する。   The present invention relates to an ultrasonic welding machine provided with a heat absorbing means for absorbing heat generated from an object to be welded during ultrasonic welding.

近年、環境意識の高まりを受けて、自動車の動力源を、化石燃料を利用するエンジンから電気エネルギーを利用するモータに移行しようとする動きがある。このため、モータの電力源となる電池の技術も急速に発展しつつある。   In recent years, in response to growing environmental awareness, there is a movement to shift the power source of automobiles from an engine using fossil fuel to a motor using electric energy. For this reason, the technology of the battery that serves as a power source for the motor is also rapidly developing.

自動車には、小型軽量で、大きな電力を頻繁に充放電可能な、耐震動性、放熱性に優れた電池の搭載が望まれる。この要望を受けて、近年では扁平形の単電池を多数直列に接続してなる組電池が開発されている。   An automobile is desired to be mounted with a battery that is small and light and can be charged and discharged with a large amount of electric power and has excellent vibration resistance and heat dissipation. In response to this demand, in recent years, an assembled battery in which a number of flat unit cells are connected in series has been developed.

組電池を製造する場合、生産性を向上させるためには単電池同士の接合を、たとえば下記特許文献１に示すように溶接によって行うことが望ましい。ところが、扁平形の単電池の場合、単電池の熱容量が小さく、また、単電池の構造自体も熱には十分な強さを持たない構造となっているため、最近では、たとえば下記特許文献２に示すように、あまり温度を上げることなく溶接できる超音波溶接を用いて単電池同士の接合を行っている。
特開２００２−１４１０５１号公報 特開２００２−９６１８０号公報 When manufacturing an assembled battery, in order to improve productivity, it is desirable to perform joining of single cells by welding as shown, for example, in Patent Document 1 below. However, in the case of a flat unit cell, the heat capacity of the unit cell is small, and the unit cell itself has a structure that does not have sufficient strength against heat. As shown in FIG. 1, the cells are joined to each other using ultrasonic welding that can be welded without increasing the temperature.
JP 2002-141051 A JP 2002-96180 A

単電池同士の接合を超音波溶接によって行えば、抵抗溶接などの従来の溶接に比べて接合部の温度を低く抑えることが可能である。しかしながら、一般的に単電池の熱容量はあまり大きくないことからその温度が上がりやすく、また、単電池自体の構造は熱や振動に対して十分な強さを持たないため、超音波溶接時の更なる熱対策や振動対策が必要になる。   If the cells are joined by ultrasonic welding, the temperature of the joint can be kept lower than that of conventional welding such as resistance welding. However, since the heat capacity of a single cell is generally not so large, its temperature tends to rise, and the structure of the single cell itself does not have sufficient strength against heat and vibration. It becomes necessary to take measures against heat and vibration.

本発明は、以上のような要請に鑑みてなされたものであり、超音波溶接時に被溶接物から発生する熱を吸熱する吸熱手段を備えた超音波溶接機の提供を目的とする。   The present invention has been made in view of the above demands, and an object of the present invention is to provide an ultrasonic welding machine provided with a heat absorbing means for absorbing heat generated from an object to be welded during ultrasonic welding.

上記目的を達成するための本発明にかかる超音波溶接機は、電池要素を内蔵した複数の単電池の電極タブをアンビル上に重ねてセットしホーンチップで前記電極タブを加圧および加振することによって前記電極タブ同士を超音波溶接する超音波溶接機であって、少なくとも超音波溶接時には前記ホーンチップが前記電極タブを加圧および加振する溶接部分の周囲を取り囲むように前記電極タブを上下から挟み込む吸熱手段が設けられていることを特徴とする。
また、上記目的を達成するための本発明にかかる超音波溶接機は、電池要素を内蔵した複数の単電池の電極タブをアンビル上に重ねてセットしホーンチップで前記電極タブを加圧および加振することによって前記電極タブ同士を超音波溶接する超音波溶接機であって、少なくとも超音波溶接時には前記ホーンチップが前記電極タブを加圧および加振する溶接部分よりも前記電池要素側に前記電極タブを上下から挟み込む吸熱手段が設けられていることを特徴とする。
In order to achieve the above object, an ultrasonic welding machine according to the present invention sets an electrode tab of a plurality of unit cells containing battery elements on an anvil and pressurizes and vibrates the electrode tab with a horn tip. An ultrasonic welding machine that ultrasonically welds the electrode tabs to each other, and at least during ultrasonic welding, the horn tip surrounds the periphery of the welded portion that pressurizes and vibrates the electrode tabs. It is characterized in that a heat absorbing means for sandwiching from above and below is provided.
In order to achieve the above object, an ultrasonic welding machine according to the present invention is configured such that electrode tabs of a plurality of single cells containing battery elements are set on an anvil, and the electrode tabs are pressed and applied with a horn tip. An ultrasonic welding machine that ultrasonically welds the electrode tabs by shaking, wherein at least during ultrasonic welding, the horn tip is closer to the battery element than the welded portion that pressurizes and vibrates the electrode tabs. A heat absorption means for sandwiching the electrode tab from above and below is provided.

電極タブを上下から挟み込む吸熱手段を設けることによって、超音波溶接時に電極タブから発生する熱をこの吸熱手段に吸熱させることができ、電池要素の温度を過度に上昇させることなく溶接が可能になる。
By providing heat absorption means for sandwiching the electrode tab from above and below, heat generated from the electrode tab during ultrasonic welding can be absorbed by the heat absorption means, and welding can be performed without excessively increasing the temperature of the battery element. .

本発明にかかる超音波溶接機によれば、電極タブを上下から挟み込む吸熱手段が設けられているので、電池要素の温度を過度に上昇させることなく電極タブ同士の溶接が可能になる。 According to the ultrasonic welding machine according to the present invention, since the heat absorbing means for sandwiching the electrode tab from above and below is provided, the electrode tabs can be welded together without excessively increasing the temperature of the battery element.

以下に本発明にかかる超音波溶接機を図面に基づいて詳細に説明する。なお、本明細書では超音波溶接機が備える吸熱手段として３つのタイプの吸熱手段を例示している。したがって、超音波溶接機を吸熱手段のタイプごとに[実施の形態１]から[実施の形態３]に分けて説明する。   Hereinafter, an ultrasonic welder according to the present invention will be described in detail with reference to the drawings. In this specification, three types of heat absorbing means are illustrated as the heat absorbing means included in the ultrasonic welder. Therefore, the ultrasonic welder will be described separately for each type of heat absorbing means from [Embodiment 1] to [Embodiment 3].

[実施の形態１]
図１は本実施の形態にかかる超音波溶接機の概略構成図であり、図２は被溶接物となる扁平形単電池の概略構成図であり、図３は本実施の形態にかかる超音波溶接機で単電池の電極タブを接合している状態を示す図である。 [Embodiment 1]
FIG. 1 is a schematic configuration diagram of an ultrasonic welder according to the present embodiment, FIG. 2 is a schematic configuration diagram of a flat unit cell to be welded, and FIG. 3 is an ultrasonic waveform according to the present embodiment. It is a figure which shows the state which has joined the electrode tab of the cell with the welding machine.

本実施の形態にかかる超音波溶接機１００は、被溶接物である単電池２００の電極タブ２１０を載置するアンビル１１０と、電極タブ２１０の接合部２１５をアンビル１１０の設置側から取り囲むように設けられたクランプ受け部１２０と、電極タブ２１０の接合部２１５をクランプ受け部１２０に対向する側から囲み電極タブ２１０をクランプ受け部１２０に向けて加圧するクランプ部１３０と、下部に取り付けられたホーンチップ１４５を、電極タブ２１０を介在させた状態でアンビル１１０上に加圧させ、加圧させたままホーンチップ１４５を図示Ａ−Ｂ方向に超音波振動させるホーン１４０を備えている。アンビル１１０とクランプ受け部１２０は冶具ベース１５０に取り付けられている。   The ultrasonic welding machine 100 according to the present embodiment surrounds the anvil 110 on which the electrode tab 210 of the unit cell 200 that is an object to be welded is placed and the joint 215 of the electrode tab 210 from the installation side of the anvil 110. The clamp receiving portion 120 provided, the joint portion 215 of the electrode tab 210 is surrounded from the side facing the clamp receiving portion 120, the electrode tab 210 is pressed toward the clamp receiving portion 120, and the lower portion is attached. The horn chip 145 is pressurized on the anvil 110 with the electrode tabs 210 interposed therebetween, and the horn 140 is provided that ultrasonically vibrates the horn chip 145 in the direction AB shown in the figure. The anvil 110 and the clamp receiving part 120 are attached to the jig base 150.

アンビル１１０の表面には細かな凹凸が形成され、また、ホーン１４０に着脱自在に取り付けられるホーンチップ１４５の表面にも細かな凹凸が形成されている。アンビル１１０とホーンチップ１４５の表面に凹凸が形成されているのは、摩擦熱を発生させ易くするためである。ホーン１４０は図示しない振動子によって図１Ａ−Ｂ水平方向の超音波振動が与えられるとともに、図示しない加圧手段によって図１Ｃ垂直下方の加圧力が与えられる。クランプ受け部１２０とクランプ部１３０とは吸熱性を考慮して熱伝達率の大きなたとえば銅などの金属で形成されている。クランプ部１３０は、クランプ受け部１２０と同じく電極タブ２１０の接合部２１５を取り囲むことのできる大きさのロ型形状の中空体をなす押圧部材１３２とこの押圧部材１３２を回動自在に支持する支持部１３４とから形成される。押圧部材１３２の中空部１３５にはホーンチップ１４５が入り込むため、中空部１３５はホーンチップ１４５を収容することができる大きさに形成されている。図示しない駆動手段（エアー圧、油圧利用の駆動手段、またはモータ利用の駆動手段）によって駆動される支持部１３４は図１Ｄ−Ｅ方向に可動可能に支持されている。支持部１３４が図示Ｄ方向に動くと押圧部材１３２がクランプ受け部１２０に接近し、押圧部材１３２の当接面がクランプ受け部１２０の当接面１２２と重なり合うように押圧部材１３２が回動する。そして、押圧部材１３２の当接面とクランプ受け部１２０の当接面１２２とでアンビル１１０上に載置されている電極タブ２１０を所定の圧力で加圧する。この状態で押圧部材１３２の中空部１３５にホーンチップ１４５が入り込みホーン１４０が超音波振動する。この超音波振動によって電極タブ２１０が接合されることになるが、このときに電極タブ２１０から発生した熱は単電池２００の電池要素２２０に達する前にクランプ受け部１２０とクランプ部１３０によって吸熱される。したがって、クランプ受け部１２０とクランプ部１３０は吸熱手段として作用する。   Fine irregularities are formed on the surface of the anvil 110, and fine irregularities are also formed on the surface of the horn chip 145 detachably attached to the horn 140. The unevenness is formed on the surfaces of the anvil 110 and the horn chip 145 in order to easily generate frictional heat. The horn 140 is applied with ultrasonic vibration in the horizontal direction in FIGS. 1A and 1B by a vibrator (not shown), and is given a pressurizing force vertically downward in FIG. 1C by a pressing means (not shown). The clamp receiving part 120 and the clamp part 130 are made of a metal such as copper having a high heat transfer coefficient in consideration of heat absorption. The clamp part 130 is a support member that rotatably supports the pressing member 132 that forms a hollow hollow body having a size that can surround the joint 215 of the electrode tab 210, as with the clamp receiving part 120. Part 134. Since the horn chip 145 enters the hollow part 135 of the pressing member 132, the hollow part 135 is formed in a size that can accommodate the horn chip 145. A support portion 134 driven by a driving means (not shown) (driving means using air pressure, hydraulic pressure, or driving means using a motor) is supported so as to be movable in the direction of FIG. 1D-E. When the support part 134 moves in the direction D shown in the figure, the pressing member 132 approaches the clamp receiving part 120, and the pressing member 132 rotates so that the contact surface of the pressing member 132 overlaps the contact surface 122 of the clamp receiving part 120. . Then, the electrode tab 210 placed on the anvil 110 is pressed with a predetermined pressure by the contact surface of the pressing member 132 and the contact surface 122 of the clamp receiving portion 120. In this state, the horn chip 145 enters the hollow portion 135 of the pressing member 132 and the horn 140 vibrates ultrasonically. The electrode tab 210 is joined by this ultrasonic vibration. At this time, the heat generated from the electrode tab 210 is absorbed by the clamp receiving part 120 and the clamp part 130 before reaching the battery element 220 of the unit cell 200. The Therefore, the clamp receiving part 120 and the clamp part 130 act as heat absorbing means.

被溶接物となる単電池２００は、図２に示すような矩形状の扁平形積層二次電池であり、少なくとも正極板と負極板を順に積層した積層型の電池要素２２０を含んでおり、例えば、特開２００３−０５９４８６号公報に開示されているような構造を持つものである。単電池２００はその外装材としてラミネートフィルムが用いられ、内蔵されている電池要素２２０は単電池２００の周縁部が熱融着接合されることで封止される。単電池２００の長手方向両側面からは電極タブ２１０Ａ、２１０Ｂが引き出されている。電極タブ２１０Ａは＋の電極タブでありアルミニウム箔で構成されている。一方、電極タブ２１０Ｂは−の電極タブであり銅箔で構成されている。本実施の形態においては、図２に示すように、単電池を２個背中合わせ（両単電池の電池要素が外側に向くように合わせる）にし、それぞれの単電池の片方の＋の電極タブと−の電極タブとを超音波溶接する。図２の場合同図×印で示されている接合部２１５を超音波溶接機１００で超音波溶接する。   A unit cell 200 to be welded is a rectangular flat stacked secondary battery as shown in FIG. 2 and includes a stacked battery element 220 in which at least a positive electrode plate and a negative electrode plate are sequentially stacked. And a structure disclosed in Japanese Patent Application Laid-Open No. 2003-059486. The unit cell 200 uses a laminate film as its exterior material, and the built-in cell element 220 is sealed by heat-sealing the peripheral portion of the unit cell 200. Electrode tabs 210 </ b> A and 210 </ b> B are drawn out from both side surfaces of the unit cell 200 in the longitudinal direction. The electrode tab 210A is a + electrode tab and is made of an aluminum foil. On the other hand, the electrode tab 210B is a negative electrode tab and is made of copper foil. In the present embodiment, as shown in FIG. 2, two unit cells are back-to-back (with the cell elements of both unit cells facing outward), and the + electrode tab on one side of each unit cell and − The electrode tab is ultrasonically welded. In the case of FIG. 2, the joining portion 215 indicated by the symbol “X” is ultrasonically welded by the ultrasonic welding machine 100.

２個の単電池を超音波溶接する場合、図３に示すように、単電池２００Ａの＋の電極タブ２１０Ａと単電池２００Ｂの−の電極タブ２１０Ｃとを重ねてアンビル１１０上に載置し、電極タブ２１０Ａの上から押圧部材１３２を押し付ける。この状態でホーンチップ１４５を押圧部材１３２の中空部１３５に位置させ、電極タブ２１０Ａの上から図示Ｃ垂直下方の加圧力を与えながらホーン１４０を図示Ａ−Ｂ方向に超音波振動させる。   When two cells are ultrasonically welded, as shown in FIG. 3, the positive electrode tab 210A of the single cell 200A and the negative electrode tab 210C of the single cell 200B are stacked and placed on the anvil 110, The pressing member 132 is pressed from above the electrode tab 210A. In this state, the horn chip 145 is positioned in the hollow portion 135 of the pressing member 132, and the horn 140 is ultrasonically vibrated in the direction AB in the drawing while applying a pressing force vertically below the drawing C from above the electrode tab 210A.

この超音波振動によってアンビル１１０、電極タブ２１０Ａ、電極タブ２１０Ｃ、ホーンチップ１４５のそれぞれから熱が発生するが、この熱のほとんどは、接合部２１５を取り囲むように設けられている押圧部材１３２とクランプ受け部１２０に図示矢印のように流れ込み、熱に弱い電池要素２２０にまでは達しない。したがって、電池要素２２０の温度をあまり上昇させることなく接合部２１５を超音波溶接することができる。また、電極タブ２１０Ａと電極タブ２１０Ｃとはクランプ受け部１２０と押圧部材１３２とによって押さえつけられた状態で超音波溶接が行われるので、ホーン１４０からの超音波が電池要素２２０に伝わりにくくなる。なお、図には記載していないが、クランプ受け部１２０と押圧部材１３２の外表面上に凹凸を形成したり、冷却フィンを取り付けたりして、クランプ受け部１２０と押圧部材１３２に放熱手段を設ければ、吸熱効率をさらに高めることができるようになる。   The ultrasonic vibration generates heat from each of the anvil 110, the electrode tab 210A, the electrode tab 210C, and the horn tip 145, and most of this heat is clamped with the pressing member 132 provided so as to surround the joint 215. It flows into the receiving portion 120 as shown by the arrow in the figure, and does not reach the battery element 220 that is vulnerable to heat. Therefore, the joining portion 215 can be ultrasonically welded without significantly increasing the temperature of the battery element 220. In addition, since ultrasonic welding is performed with the electrode tab 210 </ b> A and the electrode tab 210 </ b> C being pressed by the clamp receiving portion 120 and the pressing member 132, the ultrasonic wave from the horn 140 is not easily transmitted to the battery element 220. Although not shown in the drawing, heat radiation means is provided to the clamp receiving part 120 and the pressing member 132 by forming irregularities on the outer surfaces of the clamp receiving part 120 and the pressing member 132 or attaching cooling fins. If provided, the endothermic efficiency can be further increased.

以上のように、本実施の形態における超音波溶接機によれば、超音波溶接時に発生する熱や振動の大部分を電池要素２２０に伝わらないようにすることができる。   As described above, according to the ultrasonic welding machine in the present embodiment, most of heat and vibration generated during ultrasonic welding can be prevented from being transmitted to the battery element 220.

［実施の形態２］
図４は本実施の形態にかかる超音波溶接機の概略構成図である。本実施の形態で説明する超音波溶接機１００Ａは、実施の形態１で説明した超音波溶接機１００とはクランプ部１３０Ａの構成とホーンチップ１４５Ａの電極タブ２１０に対する加振方向が相違する点で異なっている。 [Embodiment 2]
FIG. 4 is a schematic configuration diagram of the ultrasonic welding machine according to the present embodiment. The ultrasonic welder 100A described in the present embodiment is different from the ultrasonic welder 100 described in the first embodiment in that the configuration of the clamp portion 130A and the excitation direction of the horn tip 145A with respect to the electrode tab 210 are different. Is different.

本実施の形態にかかる超音波溶接機１００Ａは、被溶接物である単電池２００の電極タブ２１０を載置するアンビル１１０と、電極タブ２１０の接合部２１５をアンビル１１０の設置側から取り囲むように設けられたクランプ受け部１２０と、電極タブ２１０の接合部２１５をクランプ受け部１２０に対向する側から囲み電極タブ２１０をクランプ受け部１２０に向けて加圧するクランプ部１３０Ａと、下部に取り付けられたホーンチップ１４５Ａを、電極タブ２１０を介在させた状態でアンビル１１０上に加圧させ、加圧させたままホーンチップ１４５Ａを図示Ｆ−Ｇ方向に超音波振動させるホーン１４０Ａを備えている。アンビル１１０とクランプ受け部１２０は冶具ベース１５０に取り付けられている。   The ultrasonic welding machine 100A according to the present embodiment surrounds the anvil 110 on which the electrode tab 210 of the unit cell 200, which is an object to be welded, and the joint 215 of the electrode tab 210 from the installation side of the anvil 110. The clamp receiving portion 120 provided, the joint portion 215 of the electrode tab 210 is enclosed from the side facing the clamp receiving portion 120, the electrode tab 210 is pressed toward the clamp receiving portion 120, and the lower portion is attached to the lower portion. A horn 140A is provided that pressurizes the horn tip 145A onto the anvil 110 with the electrode tab 210 interposed, and ultrasonically vibrates the horn tip 145A in the FG direction shown in the drawing. The anvil 110 and the clamp receiving part 120 are attached to the jig base 150.

ホーン１４０Ａは図示しない振動子によって図４Ｆ−Ｇ水平方向の超音波振動が与えられるとともに、図示しない加圧手段によって図４Ｈ垂直下方の加圧力が与えられる。クランプ受け部１２０とクランプ部１３０Ａとは吸熱性を考慮して熱伝達率の大きなたとえば銅などの金属で形成されている。クランプ部１３０Ａは、クランプ受け部１２０と同じく電極タブ２１０の接合部２１５を取り囲むことのできる大きさのロ型形状の中空体をなす押圧部材１３２Ａとこの押圧部材１３２Ａを回動自在に支持する支持部１３４Ａとから形成される。押圧部材１３２Ａの中空部１３５Ａにはホーンチップ１４５Ａが入り込むため、中空部１３５Ａはホーンチップ１４５Ａを収容することができる大きさに形成されている。また、押圧部材１３２Ａの一部にはホーン１４０Ａのシャフト１４４との干渉を防止するための切欠部１３８が形成されている。支持部１３４Ａは図示しない駆動手段（エアー圧、油圧利用の駆動手段、またはモータ利用の駆動手段）によって図４Ｉ−Ｊ方向に駆動される。支持部１３４Ａが図示Ｊ方向に動くと押圧部材１３２Ａがクランプ受け部１２０に接近し、押圧部材１３２Ａの当接面がクランプ受け部１２０の当接面１２２と重なり合う。そして、押圧部材１３２Ａの当接面とクランプ受け部１２０の当接面１２２とでアンビル１１０上に載置されている電極タブ２１０を所定の圧力で加圧する。この状態で押圧部材１３２Ａの中空部１３５Ａにホーンチップ１４５Ａが入り込みホーン１４０が超音波振動する。この超音波振動によって電極タブ２１０が接合されることになるが、このときに電極タブ２１０から発生した熱は単電池２００の電池要素２２０に達する前にクランプ受け部１２０とクランプ部１３０によって吸熱される。したがって、クランプ受け部１２０とクランプ部１３０Ａは吸熱手段として作用する。   The horn 140A is given ultrasonic vibration in the horizontal direction of FIG. 4F-G by a vibrator (not shown), and is given a pressurizing force vertically below FIG. 4H by a pressing means (not shown). The clamp receiving part 120 and the clamp part 130A are made of a metal having a large heat transfer coefficient, for example, copper, taking heat absorption into consideration. The clamp portion 130A, like the clamp receiving portion 120, has a pressing member 132A that forms a hollow body of a size that can surround the joint portion 215 of the electrode tab 210, and a support that rotatably supports the pressing member 132A. Part 134A. Since the horn chip 145A enters the hollow part 135A of the pressing member 132A, the hollow part 135A is formed in a size that can accommodate the horn chip 145A. Further, a notch 138 for preventing interference with the shaft 144 of the horn 140A is formed in a part of the pressing member 132A. The support portion 134A is driven in the direction of FIGS. 4I-J by a driving means (not shown) (driving means using air pressure, hydraulic pressure, or driving means using a motor). When the support portion 134A moves in the J direction in the figure, the pressing member 132A approaches the clamp receiving portion 120, and the contact surface of the pressing member 132A overlaps the contact surface 122 of the clamp receiving portion 120. Then, the electrode tab 210 placed on the anvil 110 is pressed with a predetermined pressure by the contact surface of the pressing member 132A and the contact surface 122 of the clamp receiving portion 120. In this state, the horn chip 145A enters the hollow portion 135A of the pressing member 132A, and the horn 140 vibrates ultrasonically. The electrode tab 210 is joined by this ultrasonic vibration. At this time, the heat generated from the electrode tab 210 is absorbed by the clamp receiving part 120 and the clamp part 130 before reaching the battery element 220 of the unit cell 200. The Therefore, the clamp receiving part 120 and the clamp part 130A act as heat absorbing means.

本実施の形態にかかる超音波溶接機１００Ａで２個の単電池を超音波溶接する場合も、ホーン１４０Ａの超音波振動により発生した熱のほとんどが押圧部材１３２Ａとクランプ受け部１２０に流れ込み、熱に弱い電池要素２２０にまでは達しない。したがって、電池要素２２０の温度をあまり上昇させることなく接合部２１５を超音波溶接することができる。また、電極タブ２１０はクランプ受け部１２０と押圧部材１３２Ａとによって押さえつけられた状態で超音波溶接が行われるので、ホーン１４０Ａからの超音波が電池要素２２０に伝わりにくくなる。なお、図には記載していないが、クランプ受け部１２０と押圧部材１３２Ａの外表面上に凹凸を形成したり、冷却フィンを取り付けたりして、クランプ受け部１２０と押圧部材１３２に放熱手段を設ければ、吸熱効率をさらに高めることができるようになる。   Even when two units of cells are ultrasonically welded by the ultrasonic welding machine 100A according to the present embodiment, most of the heat generated by the ultrasonic vibration of the horn 140A flows into the pressing member 132A and the clamp receiving part 120, and the heat However, the battery element 220 that is weak to the battery level is not reached. Therefore, the joining portion 215 can be ultrasonically welded without significantly increasing the temperature of the battery element 220. In addition, since the electrode tab 210 is ultrasonically welded while being pressed by the clamp receiving portion 120 and the pressing member 132A, the ultrasonic wave from the horn 140A is not easily transmitted to the battery element 220. Although not shown in the drawing, heat radiation means is provided to the clamp receiving part 120 and the pressing member 132 by forming irregularities on the outer surfaces of the clamp receiving part 120 and the pressing member 132A or attaching cooling fins. If provided, the endothermic efficiency can be further increased.

以上のように、本実施の形態における超音波溶接機においても超音波溶接時に発生する熱や振動の大部分を電池要素２２０に伝わらないようにすることができる。   As described above, even in the ultrasonic welding machine according to the present embodiment, most of the heat and vibration generated during ultrasonic welding can be prevented from being transmitted to the battery element 220.

［実施の形態３］
図５は本実施の形態にかかる超音波溶接機の概略構成図である。実施の形態１、２では、吸熱手段をクランプ受け部と押圧部材によって形成したが、本実施の形態では吸熱手段を図に示すような銅製のクランプ部材１６０によって形成している。クランプ部材１６０は図示されていない駆動手段よって単電池２００の電極タブ２１０をその接合部２１５付近において図示上下方向から所定の圧力をかけて挟み込む。クランプ部材１６０を構成する一方のクランプ片１６０Ａは図１に示したアンビル１１０Ａに接近させて取り付けられている。他方のクランプ片１６０Ｂは駆動手段によって図示Ｋ−Ｌ垂直方向に駆動される。超音波溶接を行う際、アンビル１１０（図１参照）上に電極タブ２１０を載置してクランプ片１６０Ｂを降下させ、図５に示すようにクランプ部材１６０によって接合部２１５付近を挟み込む。この状態で超音波溶接を行うと、ホーン１４０（図１参照）の超音波振動により発生した熱のほとんどがクランプ部材１６０に流れ込み、熱に弱い電池要素２２０にまでは達しない。したがって、電池要素２２０の温度をあまり上昇させることなく接合部２１５を超音波溶接することができる。また、電極タブ２１０はクランプ部材１６０によって押さえつけられた状態で超音波溶接が行われるので、ホーン１４０からの超音波が電池要素２２０に伝わりにくくなる。 [Embodiment 3]
FIG. 5 is a schematic configuration diagram of the ultrasonic welding machine according to the present embodiment. In the first and second embodiments, the heat absorbing means is formed by the clamp receiving portion and the pressing member, but in the present embodiment, the heat absorbing means is formed by the copper clamp member 160 as shown in the figure. The clamp member 160 sandwiches the electrode tab 210 of the unit cell 200 in the vicinity of the joint 215 by applying a predetermined pressure from the vertical direction in the drawing by driving means (not shown). One clamp piece 160A constituting the clamp member 160 is attached to be close to the anvil 110A shown in FIG. The other clamp piece 160B is driven in the KL vertical direction in the drawing by the driving means. When performing ultrasonic welding, the electrode tab 210 is placed on the anvil 110 (see FIG. 1) to lower the clamp piece 160B, and the vicinity of the joint 215 is sandwiched by the clamp member 160 as shown in FIG. When ultrasonic welding is performed in this state, most of the heat generated by the ultrasonic vibration of the horn 140 (see FIG. 1) flows into the clamp member 160 and does not reach the battery element 220 that is vulnerable to heat. Therefore, the joining portion 215 can be ultrasonically welded without significantly increasing the temperature of the battery element 220. Further, since the electrode tab 210 is subjected to ultrasonic welding while being pressed by the clamp member 160, it is difficult for ultrasonic waves from the horn 140 to be transmitted to the battery element 220.

なお、図には記載していないが、クランプ部材１６０の外表面上に凹凸を形成したり、冷却フィンを取り付けたりして、クランプ部材１６０に放熱手段を設ければ、吸熱効率をさらに高めることができるようになる。   Although not shown in the figure, heat absorption efficiency can be further improved by providing heat dissipation means on the clamp member 160 by forming irregularities on the outer surface of the clamp member 160 or attaching cooling fins. Will be able to.

以上のように、本実施の形態における超音波溶接機においても超音波溶接時に発生する熱や振動の大部分を電池要素２２０に伝わらないようにすることができる。   As described above, even in the ultrasonic welding machine according to the present embodiment, most of the heat and vibration generated during ultrasonic welding can be prevented from being transmitted to the battery element 220.

以上、実施の形態１から実施の形態３においては被溶接物の例として単電池の電極タブを挙げたが、被溶接物はこれに限られるものではない。また、吸熱手段の形状も図面に示したものに限られず、少なくとも超音波溶接時に被溶接物に接触させて被溶接物からの熱を吸熱することができるものであればどのような形状のものであっても良い。   As described above, in Embodiments 1 to 3, the electrode tab of the unit cell is given as an example of the workpiece, but the workpiece is not limited to this. Further, the shape of the heat absorbing means is not limited to that shown in the drawing, and any shape is acceptable as long as it can absorb heat from the workpiece by contacting the workpiece at least during ultrasonic welding. It may be.

本発明にかかる超音波溶接機は接合部の熱を効率的に吸収し放熱させることができるため、耐熱性、耐振動性の弱い部材に連なる部分の接合に適している。   Since the ultrasonic welding machine according to the present invention can efficiently absorb and dissipate the heat of the joint, it is suitable for joining portions connected to members having low heat resistance and vibration resistance.

実施の形態１にかかる超音波溶接機の概略構成図である。1 is a schematic configuration diagram of an ultrasonic welder according to a first embodiment. 被溶接物となる扁平形単電池の概略構成図である。It is a schematic block diagram of the flat cell which becomes a to-be-welded object. 実施の形態１にかかる超音波溶接機で単電池の電極タブを接合している状態を示す図である。It is a figure which shows the state which has joined the electrode tab of the cell with the ultrasonic welding machine concerning Embodiment 1. FIG. 実施の形態２にかかる超音波溶接機の概略構成図である。FIG. 3 is a schematic configuration diagram of an ultrasonic welder according to a second embodiment. 実施の形態３にかかる超音波溶接機の概略構成図である。FIG. 5 is a schematic configuration diagram of an ultrasonic welder according to a third embodiment.

符号の説明Explanation of symbols

１００ 超音波溶接機
１００Ａ 超音波溶接機
１１０、１１０Ａ アンビル
１２０ クランプ受け部
１２２ 当接面
１３０、１３０Ａ クランプ部
１３２、１３２Ａ 押圧部材
１３４、１３４Ａ 支持部
１３５、１３５Ａ 中空部
１３８ 切欠部
１４０、１４０Ａ ホーン
１４４ シャフト
１４５、１４５Ａ ホーンチップ
１５０ 冶具ベース
１６０ クランプ部材
１６０Ａ、１６０Ｂ クランプ片
２００、２００Ａ、２００Ｂ 単電池
２１０、２１０Ａ、２１０Ｂ、２１０Ｃ 電極タブ
２１５ 接合部
２２０ 電池要素 100 Ultrasonic welding machine 100A Ultrasonic welding machine 110, 110A Anvil 120 Clamp receiving part 122 Contact surface 130, 130A Clamp part 132, 132A Press member 134, 134A Support part 135, 135A Hollow part 138 Notch part 140, 140A Horn 144 Shaft 145, 145A Horn chip 150 Jig base 160 Clamp member 160A, 160B Clamp piece 200, 200A, 200B Cell 210, 210A, 210B, 210C Electrode tab 215 Junction 220 Battery element

Claims (3)

電池要素を内蔵した複数の単電池の電極タブをアンビル上に重ねてセットしホーンチップで前記電極タブを加圧および加振することによって前記電極タブ同士を超音波溶接する超音波溶接機であって、
少なくとも超音波溶接時には前記ホーンチップが前記電極タブを加圧および加振する溶接部分の周囲を取り囲むように前記電極タブを上下から挟み込む吸熱手段が設けられていることを特徴とする超音波溶接機。 An ultrasonic welding machine that ultrasonically welds the electrode tabs by setting the electrode tabs of a plurality of single cells containing battery elements on an anvil and pressurizing and vibrating the electrode tabs with a horn tip. And
An ultrasonic welder characterized in that at least during ultrasonic welding, the horn tip is provided with heat absorption means for sandwiching the electrode tab from above and below so as to surround the periphery of the welded portion that pressurizes and vibrates the electrode tab . 前記吸熱手段は、吸熱した熱を放熱させる放熱手段が設けられていることを特徴とする請求項１に記載の超音波溶接機。 The ultrasonic welding machine according to claim 1 , wherein the heat absorbing means is provided with a heat radiating means for radiating the absorbed heat. 電池要素を内蔵した複数の単電池の電極タブをアンビル上に重ねてセットしホーンチップで前記電極タブを加圧および加振することによって前記電極タブ同士を超音波溶接する超音波溶接機であって、少なくとも超音波溶接時には前記ホーンチップが前記電極タブを加圧および加振する溶接部分よりも前記電池要素側に前記電極タブを上下から挟み込む吸熱手段が設けられていることを特徴とする超音波溶接機。
An ultrasonic welding machine that ultrasonically welds the electrode tabs by pressing and vibrating the electrode tabs of a plurality of single cells containing battery elements stacked on an anvil and pressing the electrode tabs with a horn tip. In addition, at least during ultrasonic welding, the horn tip is provided with a heat absorption means for sandwiching the electrode tab from above and below the welded part where the electrode tab is pressed and vibrated. Sonic welding machine.
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