JP2009187674A - Method of welding sheet-like electrode in laminated state to tab with ultrasonic wave - Google Patents

Method of welding sheet-like electrode in laminated state to tab with ultrasonic wave Download PDF

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JP2009187674A
JP2009187674A JP2008023035A JP2008023035A JP2009187674A JP 2009187674 A JP2009187674 A JP 2009187674A JP 2008023035 A JP2008023035 A JP 2008023035A JP 2008023035 A JP2008023035 A JP 2008023035A JP 2009187674 A JP2009187674 A JP 2009187674A
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sheet
tab
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welding
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Takushi Ogawa
琢司 小川
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FDK Corp
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FDK Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a method capable of surely welding a sheet-like conductor to a tab without breaking the sheet-like conductor in ultrasonically welding the sheet-like conductor to the tab. <P>SOLUTION: The method for welding the sheet-like conductor having flexibility to the tab to be attached to the sheet-like conductor as a terminal by using an ultrasonic welding machine includes steps of: fixing the tab on an anvil; fixing the sheet-like conductor in such a state that vibration at an amplitude not larger than a tolerance is permitted to be laminated on the tab; and welding the sheet-like conductor to the tab by pressing and vibrating the upper surface of the sheet-like conductor by a horn. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

この発明は超音波溶接技術に関し、具体的にはシート状導電体に端子となるタブを超音波溶接機を使用して溶接する際の改良技術に関する。   The present invention relates to an ultrasonic welding technique, and more specifically to an improved technique when a tab serving as a terminal is welded to a sheet-like conductor using an ultrasonic welding machine.

導電体が表面に成膜されたプラスチックフィルムや金属箔など、可撓性を有するシート状導電体に端子となるタブを取り付ける場合、超音波溶接機を用いて溶接することが多い。なお、タブは、自身が取り付けられるシート状導電体と同じように可撓性を有する導電体であったり、プレート状の金属片であったりする。図3に超音波溶接機の概略構成を示した。周知のごとく、超音波溶接機50は、溶接対象を固定するためのアンビル51と、溶接対象に超音波振動を与えるホーン52とを備えている(A)。そして、この超音波溶接機50によって、シート状導電体11とタブ40とを溶接するには、治具などを用い、双方を積層させるとともに、その積層状態がずれないようにしてアンビル51上に固定する。そして、この積層状態にあるシート状導電体12とタブ40のいずれか一方の面をホーン52により加圧しながら超音波振動させる(B)。普通、シート状導電体11とタブ40とを溶接する場合、タブ40をアンビル51側に対面させ、シート状導電体11を超音波振動が直接加わる被振動体としている。それによって、シート状導電体11とタブ40との接触面が摩擦熱によって相互に溶着し導通状態となる。   When a tab serving as a terminal is attached to a flexible sheet-like conductor such as a plastic film or a metal foil with a conductor formed on the surface, welding is often performed using an ultrasonic welding machine. The tab may be a flexible conductor like a sheet-like conductor to which the tab is attached, or may be a plate-shaped metal piece. FIG. 3 shows a schematic configuration of the ultrasonic welding machine. As is well known, the ultrasonic welding machine 50 includes an anvil 51 for fixing a welding target and a horn 52 for applying ultrasonic vibration to the welding target (A). Then, in order to weld the sheet-like conductor 11 and the tab 40 with the ultrasonic welding machine 50, a jig or the like is used to laminate both of them, and the laminated state is not shifted on the anvil 51. Fix it. Then, ultrasonic vibration is performed while pressing either one of the sheet-like conductor 12 and the tab 40 in the laminated state with the horn 52 (B). Normally, when the sheet-like conductor 11 and the tab 40 are welded, the tab 40 is made to face the anvil 51 side, and the sheet-like conductor 11 is a vibrating body to which ultrasonic vibration is directly applied. As a result, the contact surfaces of the sheet-like conductor 11 and the tab 40 are welded to each other by frictional heat and become conductive.

シート状導電体とタブとを超音波溶接する事例としては、周知の電気二重層コンデンサやリチウムイオン・キャパシタなどの蓄電素子への適用例が挙げられる。図4に蓄電素子の概略構造を示した。(A)は蓄電素子1bの透視平面図であり、(B)はその側断面図である。蓄電素子1bにおける正負それぞれの極(10p,10n)は、集電体となるシート状導電体(11p,11n)の表面にそれぞれの極の活物質を塗布してなり、蓄電素子1bは、この正負両極(10p,10n)をセパレータ30を介して対向配置させた積層体を基本構造とし、その積層体をラミネートフィルムをヒートシールしてなる袋状の外装体100内に電解液とともに収納した後、袋の口を真空封止してなっている。蓄電素子1bにおけるシート状導電体(11p,11n)には電力の取り出し口となる電極部(12p,12n)が形成され、この電極部(12p,12n)にタブ40を接続する方法として、超音波溶接方法が採用される。なお、ラミネートフィルムは、タブ40の延長方向の途中の所定位置101でヒートシールされて、タブ40の先端は外装体100の外に露出している。   Examples of ultrasonic welding of the sheet-like conductor and the tab include application examples to a known electric storage device such as an electric double layer capacitor or a lithium ion capacitor. FIG. 4 shows a schematic structure of the power storage element. (A) is a perspective plan view of the electricity storage element 1b, and (B) is a side sectional view thereof. The positive and negative poles (10p, 10n) in the electricity storage element 1b are formed by applying the active material of each electrode to the surface of the sheet-like conductor (11p, 11n) serving as a current collector. After a laminated body in which positive and negative electrodes (10p, 10n) are arranged opposite to each other with a separator 30 as a basic structure, the laminated body is housed together with an electrolyte in a bag-like exterior body 100 formed by heat-sealing a laminated film. The bag mouth is vacuum sealed. The sheet-like conductors (11p, 11n) in the electric storage element 1b are formed with electrode portions (12p, 12n) serving as power outlets, and a method of connecting the tab 40 to the electrode portions (12p, 12n) A sonic welding method is adopted. The laminate film is heat-sealed at a predetermined position 101 in the middle of the extending direction of the tab 40, and the tip of the tab 40 is exposed outside the exterior body 100.

しかしながら、シート状導電体とタブとを超音波溶接する場合、強固な個体金属同士を溶接する場合とは異なり、確実に双方を溶接させようとして強い超音波振動を加えると、可撓性の薄いシート状導電体が破れてしまうことがある。フィルム表面の導電体膜を塗布したシート状導電体であれば、フィルム自体が破れなくても、その導電体膜が剥がれる可能性がある。また、破損を恐れて振動を弱くすると、シート状導電体とタブの双方がアンビルに対して固定されているため、ホーンの振動が互いの溶接面に確実に伝わらず、溶接不良が発生する場合がある。   However, when the sheet-like conductor and the tab are ultrasonically welded, unlike the case where the solid solid metals are welded to each other, if strong ultrasonic vibration is applied in order to surely weld the two, the flexible thin film The sheet-like conductor may be broken. If it is a sheet-like conductor which apply | coated the conductor film of the film surface, even if the film itself is not torn, the conductor film may peel off. Also, if vibration is weakened due to fear of breakage, both the sheet-like conductor and the tab are fixed to the anvil, so the horn's vibration is not reliably transmitted to each welding surface, resulting in poor welding There is.

さらに、上述した蓄電素子などは、高容量化のため、一対の正負極からなる蓄電素子を、例えば、30〜50層も積層した多層構造とする場合が多い。そのため、各層の蓄電素子からの電極部をタブとともに積層し、これらを一括して溶接・接続する必要がある。すなわち、多層構造の蓄電素子では、タブとともに多数のシート状導電体同士をも超音波溶接することになり、ある程度強い超音波振動で溶接する必要がある。しかし、振動強度が大きいとホーンに接する側のシート状導電体が破損する可能性が高くなる。このように、従来の超音波溶接方法では、とくに、シート状導電体を多数積層してそれらを確実に超音波溶接することが極めて困難となる。   Furthermore, the above-described power storage element or the like often has a multilayer structure in which, for example, 30 to 50 layers of power storage elements including a pair of positive and negative electrodes are stacked in order to increase the capacity. Therefore, it is necessary to laminate the electrode parts from the electricity storage elements of each layer together with the tabs, and weld and connect them together. In other words, in a multi-layered storage element, a large number of sheet-like conductors are ultrasonically welded together with the tabs, and it is necessary to weld them with a certain degree of ultrasonic vibration. However, if the vibration intensity is high, the sheet-like conductor on the side in contact with the horn is more likely to be damaged. As described above, in the conventional ultrasonic welding method, it is particularly difficult to laminate a large number of sheet-like conductors and reliably ultrasonically weld them.

本発明は、シート状導電体とタブとを超音波溶接する際の問題に鑑みなされたもので、その目的は、シート状導電体を破損させることなく確実にタブと溶接することができる超音波溶接方法を提供することにある。   The present invention has been made in view of the problem of ultrasonic welding of a sheet-like conductor and a tab, and the object thereof is ultrasonic that can be reliably welded to the tab without damaging the sheet-like conductor. It is to provide a welding method.

本発明者らは、工業製品にはその製造段階において公差が設けられていることに着目した。公差は、製造段階で許容される寸法誤差であり、製品の各種寸法が公差以内に収まっていれば、製品の機能には何ら問題がない。一般的に超音波溶接における振動の振幅は数10μmのオーダーであり、公差は、製品の大きさにもよるが、概ねmm単位であり、少なくても、超音波振動の振幅に対して1桁以上の誤差が許されることになる。本来、超音波溶接に際し、溶接対象となるシート状導電体とタブとを積層した状態で固定することは、被振動体に加わる微視的な超音波振動が巨視的な振動となり、溶接位置が大きくずれてしまうことを防止することを目的としている。言い換えれば、そのずれが公差以内に収まっていれば巨視的な振動が発生してもよいのである。そこで、本発明者らは、公差以下の振幅であれば、巨視的な振動を許容する、という発想の転換を試みることで、本発明に想到した。   The inventors of the present invention have noted that tolerance is provided in the manufacturing stage of industrial products. The tolerance is a dimensional error allowed in the manufacturing stage, and there is no problem in the function of the product if the various dimensions of the product are within the tolerance. In general, the amplitude of vibration in ultrasonic welding is on the order of several tens of μm, and the tolerance is generally in millimeters, depending on the size of the product, but at least one digit relative to the amplitude of ultrasonic vibration. The above errors are allowed. Originally, when ultrasonic welding is performed, the sheet-like conductor to be welded and the tab are fixed in a stacked state, so that the microscopic ultrasonic vibration applied to the vibrating body becomes macroscopic vibration, and the welding position is The purpose is to prevent a large shift. In other words, macroscopic vibration may occur if the deviation is within tolerance. Therefore, the present inventors have arrived at the present invention by trying to change the idea that macroscopic vibration is allowed if the amplitude is less than the tolerance.

本発明は、上記発想に基づきなされたものであり、可撓性を有するシート状導電体と、当該導電体に端子として取り付けられるタブとを超音波溶接機を用いて溶接するための方法であって、
アンビル上にタブを保持するステップと、
前記シート状導電体を公差以下の振幅での振動が許可された状態で固定して前記タブの上に積層するステップと、
前記シート状導電体の上面をホーンにより加圧振動して当該シート状導電体とタブとを溶着するステップと、
を含む超音波溶接方法とした。
The present invention has been made based on the above idea, and is a method for welding a flexible sheet-like conductor and a tab attached as a terminal to the conductor using an ultrasonic welding machine. And
Holding a tab on the anvil;
Fixing the sheet-like conductor in a state in which vibration with an amplitude less than or equal to a tolerance is permitted, and laminating on the tab; and
Welding the upper surface of the sheet-like conductor under pressure with a horn to weld the sheet-like conductor and the tab;
An ultrasonic welding method including

また、可撓性を有するシート状導電体を複数積層してなるシート電極群と、当該電極群に端子として取り付けられるタブとを超音波溶接機を用いて溶接するための方法も本発明の範囲であり、その方法は、
アンビル上にタブを固定するステップと、
前記シート電極群を被振動体として、当該被振動体を公差以下の振幅での振動が許可された状態で保持するとともに、当該被振動体をタブの上に積層するステップと、
前記被振動体の上面をホーンにより加圧振動することで、シート電極群におけるそれぞれのシート状導電体同士、およびシート電極群における最下層のシート状導電体とタブとを一括して溶着するステップと、
を含んでいる。
Further, a method for welding a sheet electrode group formed by laminating a plurality of flexible sheet-like conductors and a tab attached as a terminal to the electrode group using an ultrasonic welding machine is also within the scope of the present invention. And the method is
Fixing the tab on the anvil;
With the sheet electrode group as a vibrating body, holding the vibrating body in a state where vibration with an amplitude equal to or less than a tolerance is permitted, and laminating the vibrating body on a tab;
A step of collectively welding the sheet-like conductors in the sheet electrode group and the sheet-like conductor and the lowermost sheet-like conductor in the sheet electrode group by pressurizing and vibrating the upper surface of the body to be vibrated. When,
Is included.

本発明の超音波溶接方法によれば、積層状態にあるシート状導電体とタブとを超音波振動によって溶接させる際、シート状導電体を破損させることなく確実に双方を溶接することができる。   According to the ultrasonic welding method of the present invention, when a sheet-like conductor and a tab in a laminated state are welded by ultrasonic vibration, both can be reliably welded without damaging the sheet-like conductor.

===実施形態===
本発明の超音波溶接方法の一実施形態として、上述した多層構造の蓄電素子を挙げる。図1(A)に当該蓄電素子における積層構造を示した。蓄電素子1は、周知のリチウムイオン・キャパシタであり、金属箔11p上に活性炭をシート状に成形した正極10pと、リチウムの吸蔵・放出が可能な炭素材料を主成分とする負極合剤を金属箔11n上に塗布してなる負極10nをセパレータ30を介して積層した構造を一層分の素子1aとして、その一層分の素子1aを多層積層した積層体を基本構造としている。なお、この例では、負極10n側の金属箔11n上で負極10nが形成されていない余白にリチウム金属20が貼着されて、このリチウム金属20から同じ金属箔11n上に形成された負極10nにリチウムイオンを拡散する構成となっている。正極10pと負極10nが形成されるそれぞれの金属箔(11p,11n)には、電極部(12p,12n)となる突起が形成され、正極10pと負極10nは、それぞれの電極部(12p,12n)が互いに反対方向に突設されるように積層されている。そして、この積層状態にある電極部(12p,12n)とタブ40とを本発明に係る方法に基づいて超音波溶接するのである。
=== Embodiment ===
As an embodiment of the ultrasonic welding method of the present invention, the above-described multi-layered storage element is given. FIG. 1A illustrates a stacked structure of the power storage element. The electric storage element 1 is a well-known lithium ion capacitor, and a positive electrode 10p in which activated carbon is formed into a sheet shape on a metal foil 11p, and a negative electrode mixture mainly composed of a carbon material capable of occluding and releasing lithium are made of metal. A structure in which the negative electrode 10n formed on the foil 11n is laminated with the separator 30 interposed therebetween is used as a single element 1a, and a laminated body in which the single element 1a is laminated in multiple layers is a basic structure. In this example, lithium metal 20 is attached to the blank where the negative electrode 10n is not formed on the metal foil 11n on the negative electrode 10n side, and the negative electrode 10n formed on the same metal foil 11n is formed from the lithium metal 20 to the negative electrode 10n. It is configured to diffuse lithium ions. Each metal foil (11p, 11n) on which the positive electrode 10p and the negative electrode 10n are formed has protrusions to be electrode portions (12p, 12n). The positive electrode 10p and the negative electrode 10n are connected to the respective electrode portions (12p, 12n). Are stacked so as to protrude in opposite directions. Then, the electrode portions (12p, 12n) and the tab 40 in the laminated state are ultrasonically welded based on the method according to the present invention.

図1(B)に上記蓄電素子1における超音波溶接部分の拡大図を示した。蓄電素子1は、上記積層体をラミネートフィルムの外装体100内にリチウム塩を含んだ非水電解液とともに真空封止してなっている。当該真空封止に際しては、事前に、正極10pと負極10nのそれぞれについて、各層の電極部(12p,12n)同士、および、積層状態にある電極部(積層シート電極群)13の最も外側の層の電極部14とタブ40とを超音波溶接により接続しておく。多数の電極部(12p,12n)が積層状態で溶接されているとともに、最下層の電極部13にはタブ40が溶接されている。そして、タブ40の先端部が外装体100の外部に露出するようにラミネートフィルムが所定箇所101でヒートシールされている。   FIG. 1B shows an enlarged view of the ultrasonic welding portion in the electricity storage element 1. The power storage element 1 is formed by vacuum-sealing the above laminate together with a non-aqueous electrolyte containing a lithium salt in a laminate film outer package 100. Prior to the vacuum sealing, for each of the positive electrode 10p and the negative electrode 10n, the electrode portions (12p, 12n) of each layer and the outermost layer of the electrode portion (laminated sheet electrode group) 13 in a laminated state are provided. The electrode part 14 and the tab 40 are connected by ultrasonic welding. A number of electrode portions (12p, 12n) are welded in a laminated state, and a tab 40 is welded to the lowermost electrode portion 13. The laminate film is heat-sealed at a predetermined location 101 so that the tip of the tab 40 is exposed to the outside of the exterior body 100.

本実施例における超音波溶接方法では、タブ40をアンビル側に固定し、そのタブの上に蓄電素子における積層シート電極群を載置し、積層電極群の最上層の電極部の上方からホーンにより加圧・振動させて積層電極群の各層の電極部とタブとを一括溶接している。この配置自体は、従来の超音波溶接方法と同様である。しかし、従来の方法では、タブと積層シート電極群との配置がずれないように積層シート電極群を含む蓄電素子を治具などによって固定していたのに対し、本実施例では、積層シート電極群を公差内で平面内移動を許すように保持している。   In the ultrasonic welding method in the present embodiment, the tab 40 is fixed to the anvil side, the laminated sheet electrode group in the electric storage element is placed on the tab, and a horn is used from above the uppermost electrode portion of the laminated electrode group. The electrodes and tabs of each layer of the laminated electrode group are collectively welded by applying pressure and vibration. This arrangement itself is the same as the conventional ultrasonic welding method. However, in the conventional method, the storage element including the laminated sheet electrode group is fixed by a jig or the like so that the arrangement of the tab and the laminated sheet electrode group is not shifted. The group is held to allow in-plane movement within tolerance.

図2に、積層シート電極群の保持例を示した。この例では、保持状態にある蓄電素子1を上方から見ている。蓄電素子1の平面形状をなす壁面で構成された治具110を用いるとともに、蓄電素子1とその治具110の壁面とに所定の公差に相当する間隙111を設けている。なお、当該公差は、設計上の積層シート電極群13とタブ40との配置関係に対して許容される寸法である。そして、この公差相当分の平面移動が許可されたことによって、積層シート電極群13の最上層の電極部に超音波振動が与えられた際、蓄電素子1は、公差範囲内で自由に平面振動できるため、溶接箇所における振動が積層方向に十分に伝達し、積層シート電極群13のそれぞれの電極部(12p,12n)、および最下層の電極部14とタブ40とが確実に溶接される。また、溶接位置の精度も公差の範囲内に収まる。   FIG. 2 shows an example of holding the laminated sheet electrode group. In this example, the storage element 1 in the holding state is viewed from above. A jig 110 constituted by a wall surface having a planar shape of the electricity storage element 1 is used, and a gap 111 corresponding to a predetermined tolerance is provided between the electricity storage element 1 and the wall surface of the jig 110. The tolerance is a dimension allowed for the layout relationship between the laminated sheet electrode group 13 and the tab 40 in the design. When the plane movement corresponding to the tolerance is permitted, when the ultrasonic vibration is applied to the uppermost electrode portion of the laminated sheet electrode group 13, the electric storage element 1 is freely planar vibration within the tolerance range. Therefore, the vibration at the welding location is sufficiently transmitted in the laminating direction, and each electrode portion (12p, 12n) of the laminated sheet electrode group 13, and the lowermost electrode portion 14 and the tab 40 are reliably welded. Also, the accuracy of the welding position is within the tolerance range.

===溶接方法の比較評価===
上記実施例に適用された溶接方法と従来の溶接方法とを比較するために、サンプルとして、溶接方法以外は、上記実施例とほぼ同様の構造の蓄電素子を40個作製し、そのうちの20個のサンプルを発明品として、上記実施例に適用した方法で積層シート電極群にアルミニウムや銅などの金属プレートからなるタブを溶接し、他の20個のサンプルを従来品として、従来の方法によって溶接した。なお、蓄電素子の集電体となるシート状導電体は、負極側を銅箔とし、正極側をアルミ箔としている。また、積層体は30層である。
=== Comparative evaluation of welding methods ===
In order to compare the welding method applied to the above-described embodiment and the conventional welding method, 40 power storage elements having substantially the same structure as the above-described embodiment except for the welding method were produced as samples, and 20 of them were manufactured. Welded a tab made of a metal plate such as aluminum or copper to the laminated sheet electrode group by the method applied to the above example as an invention product, and welded the other 20 samples as a conventional product by a conventional method. did. Note that in the sheet-like conductor serving as a current collector of the power storage element, the negative electrode side is a copper foil and the positive electrode side is an aluminum foil. Moreover, a laminated body is 30 layers.

そして、上記構造の発明品と従来品のそれぞれのサンプルについて、圧力・振幅・振動数などの超音波溶接に関わる各種条件を揃えてシート電極群とタブとを、それぞれの方法で超音波溶接した。溶接方法の違いによる比較評価は、タブが接続された状態の積層体を電解液とともにラミネートフィルムの外装体内に収納して真空封止し、蓄電素子として完成した状態を再現した上で溶接不良の有無を確認することで行った。すなわち、溶接部位を、溶接直後の静的な環境ではなく、外装体外から大気圧による圧縮力が加っている状態や、電解液にさらされた状態など、より過酷な環境に置くことで、溶接直後では発生していない不良や確認されにくい不良も確認できるようにした。   For each sample of the inventive product and the conventional product with the above structure, the sheet electrode group and the tab were ultrasonically welded by the respective methods with various conditions related to ultrasonic welding such as pressure, amplitude, and frequency. . The comparative evaluation based on the difference in welding method is that the laminate with the tab connected is housed in the exterior of the laminate film together with the electrolyte and vacuum sealed to reproduce the completed state as a storage element and This was done by checking the presence or absence. That is, by placing the welded part in a more severe environment such as a state where a compressive force is applied from the outside of the exterior body, rather than a static environment immediately after welding, or a state where it is exposed to an electrolytic solution, It is now possible to check defects that have not occurred immediately after welding or defects that are difficult to confirm.

表1に、実施例と従来例のそれぞれの方法で溶接したときの結果を示した。
Table 1 shows the results when welding was performed by the respective methods of the example and the conventional example.

従来の方法、すなわち、蓄電素子とタブの双方を固定して溶接する方法では、20組のサンプルのうち、積層シート電極群における最下層の電極部とタブとが外れる不良(タブ外れ)が2組、積層シート電極群における電極部間での溶接不良(中間剥離)が3組発生した。一方、本発明の溶接方法では、溶接不良となったサンプルは一つもなかった。したがって、本発明に係る超音波溶接方法によれば、シート状導電体を破損させることなく、過酷な環境下でも十分な溶接強度を維持できる。   In the conventional method, that is, the method of fixing and welding both the electricity storage element and the tab, out of 20 samples, there are 2 defects (tab removal) in which the lowermost electrode portion and the tab in the laminated sheet electrode group are detached. Three sets of poor welding (intermediate peeling) occurred between the electrode portions in the set and the laminated sheet electrode group. On the other hand, in the welding method of the present invention, there was no sample that had poor welding. Therefore, according to the ultrasonic welding method according to the present invention, sufficient welding strength can be maintained even in a harsh environment without damaging the sheet-like conductor.

===公差範囲内での振動許可について===
本発明は、シート状導電体とタブとを超音波溶接する際、ホーン側に面して超音波振動が直接加わる被振動体については、微視的な超音波振動により誘発される巨視的な振動について、その振幅が公差以下であればその振動を許可することに特徴がある。上記実施例では、被振動体となる積層シート電極群を備えた積層体と、それを保持する治具とに公差範囲内の間隙を設けていた。この例に限らず、例えば、被振動体については治具に対して強固に固定し、治具自体を公差範囲内で振動可能とするようにしてもよい。
=== Vibration permission within the tolerance range ===
In the present invention, when ultrasonically welding a sheet-like conductor and a tab, a vibrating body to which ultrasonic vibration is directly applied facing the horn side is macroscopically induced by microscopic ultrasonic vibration. The vibration is characterized in that the vibration is permitted if the amplitude is less than the tolerance. In the above-described embodiment, a gap within the tolerance range is provided in the laminated body including the laminated sheet electrode group to be a vibrating body and the jig that holds the laminated sheet electrode group. For example, the vibrating body may be firmly fixed to a jig so that the jig itself can vibrate within a tolerance range.

本発明の方法が適用される蓄電素子の概略図である。It is the schematic of the electrical storage element with which the method of this invention is applied. 上記方法の一実施形態を示す図である。FIG. 3 shows an embodiment of the method. 超音波溶接機の概略構造図である。It is a schematic structure figure of an ultrasonic welding machine. 一般的な蓄電素子の概略図である。It is the schematic of a common electrical storage element.

符号の説明Explanation of symbols

1、1b 非水電解質蓄電デバイス
10p 正極
10n 負極
11、11p、11n シート状導電体
12p、12n 電極部
13 シート電極群
40 タブ
50 超音波溶接機
51 アンビル
52 ホーン
100 治具
DESCRIPTION OF SYMBOLS 1, 1b Nonaqueous electrolyte electrical storage device 10p Positive electrode 10n Negative electrode 11, 11p, 11n Sheet-like conductor 12p, 12n Electrode part 13 Sheet electrode group 40 Tab 50 Ultrasonic welder 51 Anvil 52 Horn 100 Jig

Claims (2)

可撓性を有するシート状導電体と、当該導電体に端子として取り付けられるタブとを超音波溶接機を用いて溶接するための方法であって、
アンビル上にタブを固定するステップと、
前記シート状導電体を公差以下の振幅での振動が許可された状態で保持して前記タブの上に積層するステップと、
前記シート状導電体の上面をホーンにより加圧振動して当該シート状導電体とタブとを溶着するステップと、
を含むことを特徴とする超音波溶接方法。
A method for welding a flexible sheet-like conductor and a tab attached to the conductor as a terminal using an ultrasonic welding machine,
Fixing the tab on the anvil;
Holding the sheet-like conductor in a state where vibration with an amplitude equal to or less than a tolerance is permitted, and laminating on the tab; and
Welding the upper surface of the sheet-like conductor under pressure with a horn to weld the sheet-like conductor and the tab;
An ultrasonic welding method comprising:
可撓性を有するシート状導電体を複数積層してなるシート電極群と、当該電極群に端子として取り付けられるタブとを超音波溶接機を用いて溶接するための方法であって、
アンビル上にタブを固定するステップと、
前記シート電極群を被振動体として、当該被振動体を公差以下の振幅での振動が許可された状態で保持するとともに、当該被振動体をタブの上に積層するステップと、
前記被振動体の上面をホーンにより加圧振動することで、シート電極群におけるそれぞれのシート状導電体同士、およびシート電極群における最下層のシート状導電体とタブとを一括して溶着するステップと、
を含むことを特徴とする超音波溶接方法。
A method for welding a sheet electrode group formed by laminating a plurality of flexible sheet-like conductors and a tab attached to the electrode group as a terminal using an ultrasonic welding machine,
Fixing the tab on the anvil;
With the sheet electrode group as a vibrating body, holding the vibrating body in a state where vibration with an amplitude equal to or less than a tolerance is permitted, and laminating the vibrating body on a tab;
A step of collectively welding the sheet-like conductors in the sheet electrode group and the sheet-like conductor and the lowermost sheet-like conductor in the sheet electrode group by pressurizing and vibrating the upper surface of the body to be vibrated. When,
An ultrasonic welding method comprising:
JP2008023035A 2008-02-01 2008-02-01 Method of welding sheet-like electrode in laminated state to tab with ultrasonic wave Pending JP2009187674A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2495581A (en) * 2011-12-15 2013-04-17 Oxis Energy Ltd Connecting contact leads to lithium-based electrodes
JP2013140825A (en) * 2011-12-28 2013-07-18 Asahi Kasei Corp Laminate type electrical storage element
US10038223B2 (en) 2013-03-25 2018-07-31 Oxis Energy Limited Method of charging a lithium-sulphur cell
US10461316B2 (en) 2012-02-17 2019-10-29 Oxis Energy Limited Reinforced metal foil electrode
US10811728B2 (en) 2014-05-30 2020-10-20 Oxis Energy Ltd. Lithium-sulphur cell

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2495581A (en) * 2011-12-15 2013-04-17 Oxis Energy Ltd Connecting contact leads to lithium-based electrodes
GB2495581B (en) * 2011-12-15 2014-11-05 Oxis Energy Ltd Connecting contact leads to lithium-based electrodes
JP2013140825A (en) * 2011-12-28 2013-07-18 Asahi Kasei Corp Laminate type electrical storage element
US10461316B2 (en) 2012-02-17 2019-10-29 Oxis Energy Limited Reinforced metal foil electrode
US10038223B2 (en) 2013-03-25 2018-07-31 Oxis Energy Limited Method of charging a lithium-sulphur cell
US10811728B2 (en) 2014-05-30 2020-10-20 Oxis Energy Ltd. Lithium-sulphur cell

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