JP2021106096A - Secondary battery and welding method - Google Patents

Secondary battery and welding method Download PDF

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JP2021106096A
JP2021106096A JP2019236446A JP2019236446A JP2021106096A JP 2021106096 A JP2021106096 A JP 2021106096A JP 2019236446 A JP2019236446 A JP 2019236446A JP 2019236446 A JP2019236446 A JP 2019236446A JP 2021106096 A JP2021106096 A JP 2021106096A
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terminal
secondary battery
buffer washer
electrode side
lid
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JP7252119B2 (en
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茂樹 齋藤
Shigeki Saito
茂樹 齋藤
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Primearth EV Energy Co Ltd
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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    • Y02E60/10Energy storage using batteries

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Abstract

To solve such a problem that, in conventional secondary batteries, there are portions where welding accuracy cannot be increased.SOLUTION: One aspect of a secondary battery of the present invention includes: a case; a pole column 24 that extracts power from a power generating body stored inside the case; a lid 25 that seals the case; a terminal 28 that is provided outside the lid 25; and a buffer washer 31 that is formed so that a filler metal is a porous body. The pole column 24 has a caulked part 32 pressed against the terminal 28 while the member of the pole column 24 is caulked on an outside of the lid 25. The buffer washer 31 has a cross-linked structure 34 where, while the caulked part 32 is welded to the terminal 28, the filler metal solidifies along an outer peripheral edge of the caulked part 32 after melting and thereby the caulked part 32 and the terminal 28 are joined.SELECTED DRAWING: Figure 3

Description

本発明は二次電池及び溶接方法に関し、例えば、極柱と端子がカシメ部を介して溶接される構造を有する二次電池に関する。 The present invention relates to a secondary battery and a welding method, for example, to a secondary battery having a structure in which a pole column and a terminal are welded via a caulking portion.

近年、二次電池の利用が拡大している。この二次電池のうち自動車用二次電池では、発電体を収納した金属製のケースを密封することで形成される。このとき、二次電池では、使用により内圧が高まることが有り、この内圧による破損を防止するためにケースの密封構造に様々な工夫がなされている。この工夫点の1つに、開口部と当該開口部を封止する栓との溶接の精度を向上させることで、ケースの耐圧を向上させる点がある。そこで、溶接精度を向上させる技術の一例が特許文献1に開示されている。 In recent years, the use of secondary batteries has been expanding. Among these secondary batteries, the secondary battery for automobiles is formed by sealing a metal case containing a generator. At this time, in the secondary battery, the internal pressure may increase due to use, and various measures have been taken for the sealing structure of the case in order to prevent damage due to the internal pressure. One of the ingenuity is to improve the pressure resistance of the case by improving the accuracy of welding between the opening and the stopper that seals the opening. Therefore, Patent Document 1 discloses an example of a technique for improving welding accuracy.

特許文献1に記載の溶接線検出方法では、溶接線部に対して所定の線幅のスリット光を照射し、この照射光に対し一定の角度をなす角度からスリット光を撮像し、撮像によって得られた画像信号に基づいて水平方向ならびに垂直方向の濃淡投影値を算出し、水平方向ならびに垂直方向の濃淡投影値の変曲点の最大値と最小値とで決定される設定値で濃淡投影値を切り取り、この切り取られた水平方向の濃淡投影値と垂直方向の濃淡投影値に対して重心演算を実行し、その結果より得られた水平方向と垂直方向の重心位置に対応する画素位置を求め、その画素位置に対応した座標変換を行い溶接線の位置を算出する。 In the welding line detection method described in Patent Document 1, the weld line portion is irradiated with slit light having a predetermined line width, and the slit light is imaged from an angle forming a constant angle with respect to the irradiation light, and the slit light is obtained by imaging. The shading projection values in the horizontal and vertical directions are calculated based on the obtained image signal, and the shading projection values are set values determined by the maximum and minimum values of the variation points of the horizontal and vertical shading projection values. Is cut out, the center of gravity is calculated for the cut out horizontal shading projection value and the vertical shading projection value, and the pixel positions corresponding to the horizontal and vertical center of gravity positions obtained from the result are obtained. , The position of the welding line is calculated by performing coordinate conversion corresponding to the pixel position.

特開平10−71470号公報Japanese Unexamined Patent Publication No. 10-71470

しかしながら、二次電池では、溶接箇所として、異種金属の溶接が必要な箇所、或いは、部品間に隙間を埋めるように一方の部材を溶融させなければならない箇所など、単に溶接箇所の位置精度を高めただけでは、溶接精度を高めることが出来ない箇所がある。 However, in a secondary battery, the position accuracy of the welded part is simply improved, such as a part where welding of dissimilar metals is required or one member must be melted so as to fill a gap between parts. There are some places where the welding accuracy cannot be improved just by using it.

本発明は、上記事情に鑑みてなされたものであり、複雑な構造を有する箇所の溶接精度を高めることを目的とするものである。 The present invention has been made in view of the above circumstances, and an object of the present invention is to improve welding accuracy of a portion having a complicated structure.

本発明の二次電池の一態様は、ケースと、前記ケースの内部に収納される発電体から電力を取り出す極柱と、前記ケースを密封する蓋と、前記蓋の外部に設けられる端子と、溶加材が多孔質体となるように形成された緩衝ワッシャーと、を有し、前記極柱は前記蓋の外側において前記極柱の部材がカシメられた状態で前記端子に押しつけられたカシメ部を有し、前記緩衝ワッシャーは、前記カシメ部が前記端子に溶接された状態で、前記カシメ部の外周縁に沿って前記溶加材が溶融後に凝固し、前記カシメ部と前記端子とを接合する架橋構造を有する。 One aspect of the secondary battery of the present invention includes a case, a pole column for extracting electric power from a generator housed inside the case, a lid for sealing the case, and a terminal provided outside the lid. It has a buffer washer formed so that the filler metal is a porous body, and the pole pillar is a caulked portion pressed against the terminal in a state where the member of the pole pillar is crimped on the outside of the lid. In the buffer washer, the filler metal is melted and solidified along the outer peripheral edge of the crimped portion in a state where the crimped portion is welded to the terminal, and the crimped portion and the terminal are joined. It has a cross-linked structure.

本発明の二次電池では、溶接に起因する入熱に対して溶融しやすい緩衝ワッシャーをカシメ部と端子との間に設けることで、溶接対象のカシメ部の外周部と端子との間に緩衝ワッシャーを形成する溶加材が存在する。そして、この溶加材が溶接の入熱により溶けることでカシメ部と端子が溶接される。 In the secondary battery of the present invention, a buffer washer that easily melts against heat input caused by welding is provided between the caulked portion and the terminal to provide a buffer between the outer peripheral portion of the caulked portion to be welded and the terminal. There is a filler material that forms the washer. Then, the caulked portion and the terminal are welded by melting this filler metal by the heat input of welding.

本発明の二次電池によれば、外形が不定形、或いは、溶接対象の部品間に隙間があるなど複雑な構造を有する溶接対象箇所の溶接精度を高めることができる。 According to the secondary battery of the present invention, it is possible to improve the welding accuracy of a welded portion having a complicated structure such as an irregular outer shape or a gap between parts to be welded.

実施の形態1にかかる二次電池の構造の概略図である。It is the schematic of the structure of the secondary battery which concerns on Embodiment 1. FIG. 実施の形態1にかかる二次電池のカシメ部とZ端子の溶接工程を説明する図である。It is a figure explaining the welding process of the caulking part and Z terminal of the secondary battery which concerns on Embodiment 1. FIG. 実施の形態1にかかる二次電池のカシメ部とZ端子の溶接工程後の構造を説明する溶接箇所の断面図である。FIG. 5 is a cross-sectional view of a welded portion for explaining the structure of the caulked portion of the secondary battery and the Z terminal after the welding step according to the first embodiment. 実施の形態1にかかる二次電池の極柱、緩衝ワッシャー及びZ端子の材質を説明する表である。It is a table explaining the material of the pole pillar, the buffer washer and the Z terminal of the secondary battery which concerns on Embodiment 1. FIG. 実施の形態1にかかる二次電池のカシメ部とZ端子の溶接工程における溶接レーザーの照射点を説明する図である。It is a figure explaining the irradiation point of the welding laser in the welding process of the caulking part of the secondary battery and the Z terminal which concerns on Embodiment 1. FIG. 実施の形態2にかかる二次電池の緩衝ワッシャーの構成例の概略図である。It is the schematic of the configuration example of the buffer washer of the secondary battery which concerns on Embodiment 2. FIG. 実施の形態3にかかる二次電池の極柱、カシメ部、緩衝ワッシャー及びZ端子の材質を説明する表である。It is a table explaining the material of the pole pillar, the caulking part, the cushioning washer and the Z terminal of the secondary battery which concerns on Embodiment 3. FIG. 実施の形態4にかかる二次電池のカシメ部とZ端子の溶接工程における溶接レーザーの照射点の設定方法を説明する図である。It is a figure explaining the setting method of the irradiation point of the welding laser in the welding process of the caulking part and Z terminal of the secondary battery which concerns on Embodiment 4. FIG.

実施の形態1
以下、図面を参照して本発明の実施の形態について説明する。説明の明確化のため、以下の記載及び図面は、適宜、省略、及び簡略化がなされている。各図面において、同一の要素には同一の符号が付されており、必要に応じて重複説明は省略されている。
Embodiment 1
Hereinafter, embodiments of the present invention will be described with reference to the drawings. In order to clarify the explanation, the following description and drawings have been omitted or simplified as appropriate. In each drawing, the same elements are designated by the same reference numerals, and duplicate explanations are omitted as necessary.

まず、図1に実施の形態1にかかる二次電池1の構造の概略図を示す。図1に示すように、実施の形態1にかかる二次電池1は、捲回体10、ケース20、集電部品21、23、蓋25、端子(以下、Z端子26、28と称す)を有する。なお、端子としては、Z形状を有する端子以外の端子部品を利用することもできる。 First, FIG. 1 shows a schematic view of the structure of the secondary battery 1 according to the first embodiment. As shown in FIG. 1, the secondary battery 1 according to the first embodiment includes a winding body 10, a case 20, current collector parts 21, 23, a lid 25, and terminals (hereinafter, referred to as Z terminals 26 and 28). Have. As the terminal, a terminal component other than the terminal having a Z shape can also be used.

捲回体10は、正極シートと負極シートとセパレータシートが積層された状態で3周以上捲回され、かつ、横断面が扁平形状に形成されたものである。捲回体10は、発電体11、第1の集電部12、第2の集電部13を有する。発電体11は、正極シートのうち正極活物質が塗工された領域と、負極シートのうち負極活物質が塗工された領域と、セパレータシートと、が積層された領域である。発電体11は、二次電池の電気エネルギーを蓄積する機能を有する。第1の集電部12は、捲回体に含まれるシートのうち正極シートと負極シートの一方のシートが捲回された部分である。第2の集電部13は、捲回体に含まれるシートのうち正極シートと負極シートの他方のシートが捲回された部分である。第1の集電部12又は第2の集電部13として設けられるシートには活物質は塗工されない。 The wound body 10 is wound in a state where the positive electrode sheet, the negative electrode sheet, and the separator sheet are laminated for three or more turns, and the cross section is formed into a flat shape. The winding body 10 has a power generation body 11, a first current collecting unit 12, and a second current collecting unit 13. The power generator 11 is a region in which a positive electrode active material is coated, a negative electrode active material is coated, and a separator sheet are laminated in the positive electrode sheet. The generator 11 has a function of storing the electric energy of the secondary battery. The first current collecting unit 12 is a portion in which one of the positive electrode sheet and the negative electrode sheet is wound among the sheets included in the wound body. The second current collector 13 is a portion of the sheet included in the wound body in which the other sheet of the positive electrode sheet and the negative electrode sheet is wound. No active material is applied to the sheet provided as the first current collector 12 or the second current collector 13.

ここで、正極シート及び負極シートに塗工される活物質について説明する。正極シートには、活物質として、例えば、LiCoO2、LiMn2O4、LiNiO2等が塗工される。また、負極シートには、活物質として、例えば、黒鉛(LiC6)、チタネイト(Li4Ti5O12)等が塗工される。そして、積層体では、正極シートにおいて活物質が塗工される活物質領域と、負極シートのうち活物質が塗工される活物質領域と、が重ね合わされるように積層され、セパレータシートはこの正負の活物質領域に挟まれるように設けられる。なお、以下の説明では、正極シートと負極シートとを含む語として電極シートを用いる。 Here, the active material coated on the positive electrode sheet and the negative electrode sheet will be described. The positive electrode sheet is coated with, for example, LiCoO2, LiMn2O4, LiNiO2 or the like as an active material. Further, the negative electrode sheet is coated with, for example, graphite (LiC6), titanate (Li4Ti5O12) or the like as an active material. Then, in the laminated body, the active material region on which the active material is coated on the positive electrode sheet and the active material region on which the active material is coated on the negative electrode sheet are laminated so as to be overlapped with each other, and the separator sheet is this. It is provided so as to be sandwiched between positive and negative active material regions. In the following description, the electrode sheet is used as a term including the positive electrode sheet and the negative electrode sheet.

ケース20には、集電部品21及び集電部品23が捲回体10に取り付けられ状態で捲回体10、集電部品21及び集電部品23が収納される。そして、捲回体10、集電部品21及び集電部品23がケース20に収納された状態で蓋25とケース20が接合される。 In the case 20, the current collector component 21, the current collector component 21, and the current collector component 23 are housed in a state where the current collector component 21 and the current collector component 23 are attached to the winding body 10. Then, the lid 25 and the case 20 are joined in a state where the winding body 10, the current collecting component 21 and the current collecting component 23 are housed in the case 20.

ここで、第1の集電部12には、集電部品21が溶接技術等を用いて接合される。第2の集電部13には、集電部品23が溶接技術等を用いて接合される。そして、集電部品21には、極柱22が蓋25側に突出するように設けられる。集電部品23には、極柱24が蓋25側に突出するように設けられる。そして、ケース20に蓋25が被せられた状態で、極柱22及び極柱24は、ケース20に設けられた電極取り出し穴を介して、蓋25から突出する状態となる。 Here, the current collecting component 21 is joined to the first current collecting unit 12 by using welding technology or the like. A current collecting component 23 is joined to the second current collecting unit 13 by using welding technology or the like. Then, the current collecting component 21 is provided with the pole pillar 22 so as to project toward the lid 25 side. The current collector component 23 is provided with a pole pillar 24 so as to project toward the lid 25 side. Then, with the case 20 covered with the lid 25, the pole pillars 22 and the pole pillars 24 are in a state of protruding from the lid 25 through the electrode take-out holes provided in the case 20.

そして、蓋25から突出した極柱22には、Z端子26が接合される。Z端子26にはバスバー接続端子27が設けられており、このバスバー接続端子27に接続されるバスバーにより二次電池1は他の二次電池と連結される。また、蓋25から突出した極柱24にはZ端子28が接合される。Z端子28には、バスバー接続端子29が設けられており、バスバー接続端子29に接続されるバスバーにより二次電池1は他の二次電池と連結される。 Then, the Z terminal 26 is joined to the pole pillar 22 protruding from the lid 25. The Z terminal 26 is provided with a bus bar connection terminal 27, and the secondary battery 1 is connected to another secondary battery by the bus bar connected to the bus bar connection terminal 27. Further, the Z terminal 28 is joined to the pole pillar 24 protruding from the lid 25. The Z terminal 28 is provided with a bus bar connection terminal 29, and the secondary battery 1 is connected to another secondary battery by the bus bar connected to the bus bar connection terminal 29.

実施の形態1にかかる二次電池1では、極柱とZ端子との溶接構造に特徴の1つがある。そこで、図2に実施の形態1にかかる二次電池のカシメ部とZ端子の溶接工程を説明する図を示す。なお、実施の形態1にかかる二次電池1では、極柱にZ端子を接合する際にインシュレータ30、緩衝ワッシャー31を用いる。また、実施の形態1にかかる二次電池1では、極柱22とZ端子26の溶接方法と、極柱24とZ端子28の溶接方法は同一であるため、図2では、極柱24とZ端子28とを溶接する溶接工程を示した。また、図2では、極柱22と極柱24とを接合する工程を第1の工程から第4の工程に分解して記載した。 The secondary battery 1 according to the first embodiment has one of the features in the welded structure of the pole column and the Z terminal. Therefore, FIG. 2 shows a diagram illustrating a welding process of the caulked portion and the Z terminal of the secondary battery according to the first embodiment. In the secondary battery 1 according to the first embodiment, the insulator 30 and the buffer washer 31 are used when joining the Z terminal to the pole column. Further, in the secondary battery 1 according to the first embodiment, the welding method of the pole pillar 22 and the Z terminal 26 and the welding method of the pole pillar 24 and the Z terminal 28 are the same. The welding process for welding the Z terminal 28 is shown. Further, in FIG. 2, the step of joining the pole pillar 22 and the pole pillar 24 is described by being decomposed from the first step to the fourth step.

図2に示す第1の工程では、蓋25の上部(蓋の面のうちケース外側となる面)にインシュレータ30を介してZ端子28を配置する。この第1の工程では、Z端子28に設けられた穴を極柱24が貫通するように、Z端子28を蓋25の上面に配置する。 In the first step shown in FIG. 2, the Z terminal 28 is arranged on the upper portion of the lid 25 (the surface of the lid that is the outer side of the case) via the insulator 30. In this first step, the Z terminal 28 is arranged on the upper surface of the lid 25 so that the pole pillar 24 penetrates the hole provided in the Z terminal 28.

続いて、第2の工程では、極柱24が緩衝ワッシャー31を貫通するようにZ端子28の上部に緩衝ワッシャー31を配置する。ここで、緩衝ワッシャー31について説明する。緩衝ワッシャー31は、溶加材が多孔質体となるように形成された板状の部材からドーナツ状に切り出されたものである。多孔質体の例としては、金属繊維を圧縮して形成される不織布、金属体を発泡させて形成される発泡体がある。また、溶加材として銅化合物或いはアルミニウムが用いられる。溶加材として銅化合物を用いるかアルミニウムを用いるかは、溶接対象の極柱(特に、カシメ部32)の材質とZ端子28の材質とによって決定される。極柱、Z端子及び緩衝ワッシャーの素材の関係の詳細は後述する。そして、第2の工程では、極柱24のうち蓋25から突出した部分の端部にカシメ力を加える。このカシメ工程により、極柱の端部がかしめられてカシメ部32が形成される。このカシメ部32のうちZ端子28に面する側の面が、Z端子側に凸形状となる。このとき、緩衝ワッシャー31は、カシメ部32の変形に追従して圧縮変形する。つまり、第2の子工程では、緩衝ワッシャー31があることで、カシメ部32に対するカシメの力がインシュレータに過大にかかることを防止する緩衝層となる。 Subsequently, in the second step, the buffer washer 31 is arranged above the Z terminal 28 so that the pole pillar 24 penetrates the buffer washer 31. Here, the buffer washer 31 will be described. The buffer washer 31 is cut out in a donut shape from a plate-shaped member formed so that the filler metal becomes a porous body. Examples of the porous body include a non-woven fabric formed by compressing a metal fiber and a foam formed by foaming a metal body. Further, a copper compound or aluminum is used as the filler material. Whether a copper compound or aluminum is used as the filler material is determined by the material of the pole column (particularly, the caulked portion 32) to be welded and the material of the Z terminal 28. The details of the relationship between the materials of the pole column, the Z terminal and the buffer washer will be described later. Then, in the second step, a caulking force is applied to the end of the portion of the pole column 24 that protrudes from the lid 25. By this caulking step, the end portion of the pole column is crimped to form the caulked portion 32. The surface of the crimped portion 32 facing the Z terminal 28 has a convex shape toward the Z terminal side. At this time, the buffer washer 31 is compressed and deformed following the deformation of the caulking portion 32. That is, in the second child step, the presence of the buffer washer 31 provides a buffer layer that prevents the force of caulking on the caulking portion 32 from being excessively applied to the insulator.

続いて、第3の工程では、カシメ部32の外周縁に沿って溶接レーザー光33を照射して緩衝ワッシャー31の溶加材がカシメ部32の外周部を溶融させる。これにより、第4の工程に示すように、カシメ部32の外周縁とZ端子28とが緩衝ワッシャー31が溶融して凝固した架橋構造34により溶接された状態となる。 Subsequently, in the third step, the welding laser beam 33 is irradiated along the outer peripheral edge of the crimped portion 32, and the filler metal of the buffer washer 31 melts the outer peripheral portion of the crimped portion 32. As a result, as shown in the fourth step, the outer peripheral edge of the caulked portion 32 and the Z terminal 28 are welded by the crosslinked structure 34 in which the buffer washer 31 is melted and solidified.

なお、図2では、極柱24の端部にカシメ力を加えてカシメ部32を形成したが、別途カシメ部材を用いてZ端子と極柱24とを接合しても良い。また、Z端子については、極柱24が貫くような位置ではなく、極柱24の位置とは関係のない位置に設けるとともにカシメ部材を利用して蓋、或いは、ケースを介してケース内の集電部品と接合することもできる。このような場合においても、カシメ部材とZ端子(或いは単に端子)との間に緩衝ワッシャー31を挿入することで図2に示したような溶接工程による二次電池の製造を行える。 In FIG. 2, a caulking force is applied to the end portion of the pole pillar 24 to form the crimped portion 32, but the Z terminal and the pole pillar 24 may be joined separately by using a caulking member. Further, the Z terminal is provided at a position irrelevant to the position of the pole pillar 24, not at a position where the pole pillar 24 penetrates, and is collected in the case via a lid or a case using a caulking member. It can also be joined to electrical components. Even in such a case, the secondary battery can be manufactured by the welding process as shown in FIG. 2 by inserting the buffer washer 31 between the caulking member and the Z terminal (or simply the terminal).

続いて、第4の工程(溶接工程後)における溶接部分の構造について詳細に説明する。そこで、図3に実施の形態1にかかる二次電池1のカシメ部とZ端子の溶接工程後の構造を説明する溶接箇所の断面図を示す。 Subsequently, the structure of the welded portion in the fourth step (after the welding step) will be described in detail. Therefore, FIG. 3 shows a cross-sectional view of a welded portion for explaining the structure of the caulked portion and the Z terminal of the secondary battery 1 according to the first embodiment after the welding step.

図3に示すように、カシメ部32は、かしめ工程(例えば、図2の第2の工程)においてかしめられることで緩衝ワッシャー31を押しつぶすように、緩衝ワッシャー31にZ端子28側に位置する部分が入り込む。そして、溶接工程(例えば、図3の工程)において緩衝ワッシャー31のうちカシメ部32の外周部に沿った部分が溶接レーザー光33により溶融した後に凝固して架橋構造34となる。この架橋構造34は、カシメ部32の外周部と溶け合い、かつ、Z端子28と溶け合うことで、カシメ部32とZ端子28とを接続する。 As shown in FIG. 3, the caulking portion 32 is a portion located on the Z terminal 28 side of the buffer washer 31 so as to crush the buffer washer 31 by being crimped in the caulking step (for example, the second step of FIG. 2). Enters. Then, in the welding step (for example, the step of FIG. 3), the portion of the buffer washer 31 along the outer peripheral portion of the caulked portion 32 is melted by the welding laser beam 33 and then solidified to form a bridge structure 34. The crosslinked structure 34 connects the crimped portion 32 and the Z terminal 28 by melting with the outer peripheral portion of the crimped portion 32 and melting with the Z terminal 28.

また、実施の形態1では、緩衝ワッシャー31を構成する溶加材が多孔質となっているため、小さな入熱量の溶接レーザー光33により架橋構造34を形成する。また、実施の形態1では、カシメ部32の外周部のみに弱い溶接レーザー光33を照射する。これにより、カシメ部32の内周部分については、緩衝ワッシャー31が多孔質体の状態のまま維持される。また、緩衝ワッシャー31が多孔質体であるため、溶接レーザー光33によるえねルギーがこの多孔質隊により弱められることにより、インシュレータ30に熱による損傷が発生しにくくなる。 Further, in the first embodiment, since the filler metal constituting the buffer washer 31 is porous, the crosslinked structure 34 is formed by the welding laser light 33 having a small amount of heat input. Further, in the first embodiment, only the outer peripheral portion of the crimped portion 32 is irradiated with the weak welding laser light 33. As a result, the buffer washer 31 is maintained in a porous state for the inner peripheral portion of the crimped portion 32. Further, since the buffer washer 31 is a porous body, the energy generated by the welding laser beam 33 is weakened by the porous body, so that the insulator 30 is less likely to be damaged by heat.

続いて、実施の形態1にかかる二次電池1の極柱、緩衝ワッシャー及びZ端子の材質について説明する。そこで図4に実施の形態1にかかる二次電池1の極柱、緩衝ワッシャー及びZ端子の材質を説明する表を示す。 Subsequently, the materials of the pole pillar, the buffer washer, and the Z terminal of the secondary battery 1 according to the first embodiment will be described. Therefore, FIG. 4 shows a table for explaining the materials of the pole pillar, the buffer washer, and the Z terminal of the secondary battery 1 according to the first embodiment.

図4に示すように、二次電池1では極柱として利用する材料が異なる。これは正極シートの材質と負極シートの材質が異なるためである。例えば、二次電池1としてリチウムイオン電池を構成した場合、正極シートとしてはアルミニウムを用い、負極シートとして銅を用いる。そのため、正極側では、アルミニウム、或いは、アルミニウムを含む材料により部品が構成される。一方、負極側では、銅、或いは、銅を含む材料により部品が構成される。 As shown in FIG. 4, the material used as the pole pillar is different in the secondary battery 1. This is because the material of the positive electrode sheet and the material of the negative electrode sheet are different. For example, when a lithium ion battery is configured as the secondary battery 1, aluminum is used as the positive electrode sheet and copper is used as the negative electrode sheet. Therefore, on the positive electrode side, the component is made of aluminum or a material containing aluminum. On the other hand, on the negative electrode side, the component is made of copper or a material containing copper.

具体的には、正極側の構成部品は以下のような材料を用いる。極柱としてアルミニウム系の材料、特に、1000系のアルミニウムを用いる。緩衝ワッシャー及びZ端子としてアルミニウム系の材料、特に、5000系のアルミニウムを用いる。ここで、1000系のアルミニウムと5000系のアルミニウムを溶接する場合、互いの溶接時の入熱によって互いの合金成分が混ざり合い、その混ざり合いの程度によっては凝固時に割れが生じる。しかしながら、実施の形態1にかかる緩衝ワッシャー31を用いることで、カシメ部及びZ端子への入熱量を削減しながら、架橋構造34を形成する事ができるため、上記のような割れを防ぐことができる。 Specifically, the following materials are used for the components on the positive electrode side. Aluminum-based materials, especially 1000-based aluminum, are used as the pole columns. Aluminum-based materials, especially 5000-based aluminum, are used as the buffer washers and Z terminals. Here, when 1000-series aluminum and 5000-series aluminum are welded, the alloy components of each other are mixed due to the heat input during welding, and cracks occur during solidification depending on the degree of mixing. However, by using the buffer washer 31 according to the first embodiment, the crosslinked structure 34 can be formed while reducing the amount of heat input to the crimped portion and the Z terminal, so that the above-mentioned cracking can be prevented. can.

負極側の構成部品は、以下のような材料を用いる。極柱及びZ端子として銅を用いる。一方、緩衝ワッシャーとしては、銅とシリコンの合金材(以下、CuSiと称す)を用いる。ここで、CuSiは、銅に比べると融点が低い特徴がある。そのため、実施の形態1にかかる緩衝ワッシャー31を用いることで、負極側のカシメ部及びZ端子への入熱量を削減しながら、架橋構造34を形成する事ができる。 The following materials are used for the components on the negative electrode side. Copper is used as the pole column and Z terminal. On the other hand, as the buffer washer, an alloy material of copper and silicon (hereinafter referred to as CuSi) is used. Here, CuSi is characterized by having a lower melting point than copper. Therefore, by using the buffer washer 31 according to the first embodiment, the crosslinked structure 34 can be formed while reducing the amount of heat input to the crimped portion and the Z terminal on the negative electrode side.

続いて、カシメ部の外周縁と溶接レーザー光33の照射点との関係について説明する。そこで、図5に実施の形態1にかかる二次電池のカシメ部とZ端子の溶接工程における溶接レーザーの照射点を説明する図を示す。 Subsequently, the relationship between the outer peripheral edge of the caulked portion and the irradiation point of the welding laser beam 33 will be described. Therefore, FIG. 5 shows a diagram illustrating an irradiation point of the welding laser in the welding process of the caulked portion and the Z terminal of the secondary battery according to the first embodiment.

図5に示すように、カシメ部32は、カシメ工程により外周縁形状が歪んだ形状となる。実施の形態1にかかる二次電池1の製造工程では、元々のカシメ部32の外周縁の形状に沿ってレーザー照射点を移動させせる。このとき、カシメ部32の歪みにより、図5の点Aではカシメ部32の外周部分に照射される溶接レーザー光33が少なく、点Bではカシメ部32の外周部分に照射される溶接レーザー光33が多くなるという、溶接レーザー光33の照射量の不均一が生じる。しかし、実施の形態1にかかる二次電池1では、緩衝ワッシャー31を設けることで、このような溶接レーザー光33の照射量の不均一が生じても、緩衝ワッシャー31の溶融と凝固によって形成される架橋構造34により均一な強度でカシメ部32とZ端子28とを溶接する。 As shown in FIG. 5, the caulking portion 32 has a distorted outer peripheral edge shape due to the caulking process. In the manufacturing process of the secondary battery 1 according to the first embodiment, the laser irradiation point is moved along the shape of the outer peripheral edge of the original caulking portion 32. At this time, due to the distortion of the caulking portion 32, the welding laser light 33 irradiating the outer peripheral portion of the caulking portion 32 is small at the point A in FIG. 5, and the welding laser light 33 irradiating the outer peripheral portion of the caulking portion 32 at the point B. The amount of irradiation of the welding laser light 33 becomes non-uniform. However, in the secondary battery 1 according to the first embodiment, by providing the buffer washer 31, even if the irradiation amount of the welding laser light 33 is uneven, it is formed by melting and solidifying the buffer washer 31. The crimped portion 32 and the Z terminal 28 are welded with uniform strength by the crosslinked structure 34.

上記説明より、実施の形態1にかかる二次電池1では、緩衝ワッシャー31を設けることで、低入熱量で架橋構造34を形成してカシメ部とZ端子とを溶接することができる。 From the above description, in the secondary battery 1 according to the first embodiment, by providing the buffer washer 31, the crosslinked structure 34 can be formed with a low heat input amount and the caulked portion and the Z terminal can be welded to each other.

負極端子側においては、Z端子の下部にインシュレータ30が設けられるが、このインシュレータ30は樹脂で形成されており,熱による変形や変成が問題となる。しかしながら、実施の形態1にかかる二次電池1では、多孔質隊の溶加材で形成された緩衝ワッシャー31を設けることで、多孔質体に含まれる空気層が溶接レーザー光33により与えられる熱を遮る断熱材として機能するため、インシュレータ30に対する入熱量を抑制してインシュレータ30の変形或いは変成を抑制することができる。 On the negative electrode terminal side, an insulator 30 is provided below the Z terminal, but the insulator 30 is made of resin, and deformation or deformation due to heat becomes a problem. However, in the secondary battery 1 according to the first embodiment, by providing the buffer washer 31 formed of the filler material of the porous body, the air layer contained in the porous body is heated by the welding laser light 33. Since it functions as a heat insulating material that shields the insulator 30, it is possible to suppress the amount of heat input to the insulator 30 and suppress the deformation or deformation of the insulator 30.

また、Z端子とカシメ部の外周部との間には隙間が出来るが、この隙間高さを低減するためにカシメ高さを低く変形させることが考えられる。しかし、カシメ高さを低くするとZ端子に傷が付き、インシュレータ30にも過大な圧力が加わりインシュレータ30の変形を招く等の問題が生じる。このようなZ端子の傷或いはインシュレータ30の変形はケースの密閉性能や期待寿命の低下を招く。しかしながら、実施の形態1にかかる二次電池1では、緩衝ワッシャー31を設けることにより、低入熱量であっても大きな隙間を架橋構造34により接合することができるため、上記のような問題は生じない。 Further, although a gap is formed between the Z terminal and the outer peripheral portion of the caulking portion, it is conceivable to lower the caulking height in order to reduce the gap height. However, if the caulking height is lowered, the Z terminal is scratched, excessive pressure is applied to the insulator 30, and problems such as deformation of the insulator 30 occur. Such scratches on the Z terminal or deformation of the insulator 30 cause a decrease in the sealing performance of the case and the expected life. However, in the secondary battery 1 according to the first embodiment, by providing the buffer washer 31, a large gap can be joined by the crosslinked structure 34 even with a low heat input amount, so that the above problem occurs. do not have.

正極端子側においては、カシメ部及びZ端子に対する入熱量が大きくなると、異種のアルミニウム素材の溶接で問題となる割れが発生する。しかしながら、実施の形態1にかかる二次電池1では、緩衝ワッシャー31を設けることで、溶接時の入熱量を低減しながら架橋構造34によりカシメ部とZ端子とを接合するため、異種のアルミニウムの溶接により問題となる割れを防ぐことができる。 On the positive electrode terminal side, when the amount of heat input to the crimped portion and the Z terminal becomes large, cracks that become a problem in welding different types of aluminum materials occur. However, in the secondary battery 1 according to the first embodiment, since the caulking portion and the Z terminal are joined by the crosslinked structure 34 while reducing the amount of heat input during welding by providing the buffer washer 31, different types of aluminum are used. Welding can prevent problematic cracking.

また、緩衝ワッシャー31を多孔質体で形成する事で、上部から照射する溶接レーザー光33により発生する熱がZ端子側に伝わりにくくなる。これは、多孔質体で形成される緩衝ワッシャー31が断熱材として作用するためである。さらに、緩衝ワッシャー31は、カシメ部32をかしめるカシメ工程においてインシュレータ30に過大な圧力がかかることを防止する緩衝層として機能する。 Further, by forming the buffer washer 31 with a porous body, the heat generated by the welding laser light 33 irradiated from above is less likely to be transmitted to the Z terminal side. This is because the buffer washer 31 formed of the porous body acts as a heat insulating material. Further, the buffer washer 31 functions as a buffer layer for preventing excessive pressure from being applied to the insulator 30 in the caulking step of crimping the caulking portion 32.

実施の形態2
実施の形態2では、緩衝ワッシャー31の別の形態について説明する。具体的には、実施の形態2では、緩衝ワッシャー31の第1の変形例となる緩衝ワッシャー31aと、緩衝ワッシャー31の第2の変形例となる緩衝ワッシャー31bについて説明する。
Embodiment 2
In the second embodiment, another embodiment of the buffer washer 31 will be described. Specifically, in the second embodiment, the buffer washer 31a which is a first modification of the buffer washer 31 and the buffer washer 31b which is a second modification of the buffer washer 31 will be described.

そこで、図6に実施の形態2にかかる二次電池の緩衝ワッシャーの構成例の概略図を示す。図6では、上図に緩衝ワッシャー31aを示し、下図に緩衝ワッシャー31bを示した。緩衝ワッシャー31aは、外周部に溶加材の密度が高い密領域が形成され、内周部に溶加材の密度が外周部よりも低い粗領域が形成される。緩衝ワッシャー31aは、内周部の溶加材の密度を低くすることで空気層が増加し、断熱性能が高まる。また、緩衝ワッシャー31aは、外周部の溶加材の密度を高くすることで架橋構造34をより低い入熱量で形成することができる。なお、緩衝ワッシャー31aの別の例としては、1層の溶加材のシートで低密度領域を構成し、2層の溶加材のシートで高密度領域を構成することもできる。 Therefore, FIG. 6 shows a schematic view of a configuration example of the buffer washer of the secondary battery according to the second embodiment. In FIG. 6, the buffer washer 31a is shown in the upper figure, and the buffer washer 31b is shown in the lower figure. In the buffer washer 31a, a dense region having a high density of filler material is formed on the outer peripheral portion, and a rough region having a density of the filler material lower than that on the outer peripheral portion is formed on the inner peripheral portion. In the buffer washer 31a, the air layer is increased by lowering the density of the filler metal in the inner peripheral portion, and the heat insulating performance is improved. Further, the buffer washer 31a can form the crosslinked structure 34 with a lower amount of heat input by increasing the density of the filler metal on the outer peripheral portion. As another example of the buffer washer 31a, a low-density region can be formed by a single-layer filler sheet, and a high-density region can be formed by a two-layer filler sheet.

また、図6に示した緩衝ワッシャー31bは、二次電池1にはめ込んだ状態で、カシメ部側となる第1の層41と、Z端子側となる第2の層42の2層構造を有する。第1の層41は、少なくともカシメ部の素材を含む溶加材で形成される。第2の層は、少なくともZ端子の素材と同一素材の溶加材で形成される第2の層と、を有する。これにより、緩衝ワッシャー31bは、対面する部品との溶融が低い入熱量で生じるため、架橋構造34を実施の形態1にかかる緩衝ワッシャー31よりも低い入熱量で形成することができる。 Further, the buffer washer 31b shown in FIG. 6 has a two-layer structure of a first layer 41 on the caulking portion side and a second layer 42 on the Z terminal side in a state of being fitted in the secondary battery 1. .. The first layer 41 is formed of a filler material containing at least a material for a crimped portion. The second layer has at least a second layer formed of a filler material of the same material as the material of the Z terminal. As a result, since the buffer washer 31b is melted with the facing parts with a low heat input amount, the crosslinked structure 34 can be formed with a lower heat input amount than the buffer washer 31 according to the first embodiment.

実施の形態3
実施の形態3では、極柱、カシメ部、緩衝ワッシャー及びZ端子の材質の別の形態について説明する。そこで、図7に実施の形態3にかかる二次電池の極柱、カシメ部、緩衝ワッシャー及びZ端子の材質を説明する表を示す。
Embodiment 3
In the third embodiment, another form of the material of the pole column, the caulked portion, the buffer washer, and the Z terminal will be described. Therefore, FIG. 7 shows a table for explaining the materials of the pole pillar, the caulked portion, the buffer washer, and the Z terminal of the secondary battery according to the third embodiment.

図7に示すように、実施の形態3にかかる二次電池では、負極側のZ端子の材質がアルミニウムとなる。部材コスト低減のために銅の使用量を低減することが近年進められており、Z端子をアルミニウム(特に、5000系アルミニウム)とすることが検討されている。このような場合において、緩衝ワッシャー31としてCuSiを利用することで以下のような効果が生じる。 As shown in FIG. 7, in the secondary battery according to the third embodiment, the material of the Z terminal on the negative electrode side is aluminum. In recent years, reduction of the amount of copper used in order to reduce the cost of members has been promoted, and it is being studied to use aluminum (particularly 5000 series aluminum) for the Z terminal. In such a case, the following effects are obtained by using CuSi as the buffer washer 31.

CuSiで形成された緩衝ワッシャー31に溶接レーザー光33を照射すると緩衝ワッシャー31の銅とシリコンが分離するとともに、酸化シリコン(SiO)とCuAlが生成される。これにより、架橋構造34の表面の酸化アルミ膜が除去されるとともに、酸化シリコン膜が表面に形成され、内部に耐食性に優れたCuAl層が形成される。つまり、Z端子としてアルミニウムを使用することで高い耐食性を有する架橋構造34を形成することができる。 When the buffer washer 31 made of CuSi is irradiated with the welding laser beam 33, the copper and silicon of the buffer washer 31 are separated, and silicon oxide (SiO) and CuAl are generated. As a result, the aluminum oxide film on the surface of the crosslinked structure 34 is removed, the silicon oxide film is formed on the surface, and the CuAl layer having excellent corrosion resistance is formed inside. That is, by using aluminum as the Z terminal, a crosslinked structure 34 having high corrosion resistance can be formed.

実施の形態4
実施の形態4では、レーザー溶接における溶接線の設定方法の別の形態について説明する。そこで、図8に実施の形態4にかかる二次電池のカシメ部とZ端子の溶接工程における溶接レーザーの照射点の設定方法を説明する図を示す。
Embodiment 4
In the fourth embodiment, another embodiment of the method of setting the welding line in laser welding will be described. Therefore, FIG. 8 shows a diagram illustrating a method of setting a welding laser irradiation point in the welding process of the caulked portion and the Z terminal of the secondary battery according to the fourth embodiment.

実施の形態4にかかる溶接線の設定方法では、溶接対象箇所となるカシメ部32の周囲の画像を取得して、画像処理を利用して溶接線の座標を特定する溶接線設定処理を行う溶接装置を利用する。図4に示す例では、まず、溶接装置が、カシメ部32の周囲の画像を取得して、取得した画像に対してカシメ部の外周縁を含む領域に帯状のエッジ検出領域WDを複数設定する。続いて、溶接装置は、エッジ検出領域WDから得られた画像に対して蓋25の表面を底にした高さ方向の高さに応じて明から暗に転じる画像を生成する。そして、溶接装置は、生成した明暗画像に対してエッジ検出領域WDごとに明部と暗部との境界線に沿って溶接中心線を設定する。 In the welding line setting method according to the fourth embodiment, welding is performed by acquiring an image around the caulked portion 32 to be welded and using image processing to specify the coordinates of the welding line. Use the device. In the example shown in FIG. 4, first, the welding apparatus acquires an image around the crimped portion 32, and sets a plurality of band-shaped edge detection regions WD in a region including the outer peripheral edge of the crimped portion with respect to the acquired image. .. Subsequently, the welding apparatus generates an image that changes from light to dark according to the height in the height direction with the surface of the lid 25 as the bottom with respect to the image obtained from the edge detection region WD. Then, the welding apparatus sets the welding center line along the boundary line between the bright portion and the dark portion for each edge detection region WD with respect to the generated bright / dark image.

そして、実施の形態4にかかる溶接装置では、設定した溶接中心線を溶接線とし、この溶接中心線に沿って溶接レーザー光33を移動させる。これにより、実施の形態4にかかる溶接線の設定方法を用いて製造された二次電池では、歪んだカシメ部32に対して形成される架橋構造34の均一性を実施の形態1にかかる二次電池1よりも高めることができる。 Then, in the welding apparatus according to the fourth embodiment, the set welding center line is set as the welding center line, and the welding laser beam 33 is moved along the welding center line. As a result, in the secondary battery manufactured by using the welding line setting method according to the fourth embodiment, the uniformity of the crosslinked structure 34 formed with respect to the distorted caulking portion 32 is applied to the second embodiment. It can be higher than that of the next battery 1.

なお、本発明は上記実施の形態に限られたものではなく、趣旨を逸脱しない範囲で適宜変更することが可能である。上記実施の形態で説明では、以下の付記に記載の観点を考えることもできる。 The present invention is not limited to the above embodiment, and can be appropriately modified without departing from the spirit. In the description of the above embodiment, the viewpoints described in the following appendices can also be considered.

1 二次電池
10 捲回体
11 発電体
12 第1の集電部
13 第2の集電部
20 ケース
21 集電部品
22 極柱
23 集電部品
24 極柱
25 蓋
26 Z端子
27 バスバー接続端子
28 Z端子
29 バスバー接続端子
30 インシュレータ
31 緩衝ワッシャー
32 カシメ部
33 溶接レーザー光
34 架橋構造
WD エッジ検出領域
1 Rechargeable battery 10 Winder 11 Generator 12 1st current collector 13 2nd current collector 20 Case 21 Current collector parts 22 Polar poles 23 Current collectors parts 24 Polar poles 25 Lid 26 Z terminal 27 Busbar connection terminal 28 Z terminal 29 Bus bar connection terminal 30 Insulator 31 Buffer washer 32 Caulking part 33 Welding laser light 34 Bridge structure WD edge detection area

Claims (8)

ケースと、
前記ケースの内部に収納される発電体から電力を取り出す極柱と、
前記ケースを密封する蓋と、
前記蓋の外部に設けられる端子と、
溶加材が多孔質体となるように形成された緩衝ワッシャーと、を有し、
前記極柱は前記蓋の外側において前記極柱の部材がカシメられた状態で前記端子に押しつけられたカシメ部を有し、
前記緩衝ワッシャーは、前記カシメ部が前記端子に溶接された状態で、前記カシメ部の外周縁に沿って前記溶加材が溶融後に凝固し、前記カシメ部と前記端子とを接合する架橋構造を有する二次電池。
With the case
A pole pillar that extracts electric power from the generator housed inside the case,
A lid that seals the case and
Terminals provided on the outside of the lid and
It has a buffer washer, which is formed so that the filler metal becomes a porous body.
The pole pillar has a crimped portion pressed against the terminal in a state where the member of the pole pillar is crimped on the outside of the lid.
The buffer washer has a crosslinked structure in which the filler metal is melted and solidified along the outer peripheral edge of the crimped portion while the crimped portion is welded to the terminal, and the crimped portion and the terminal are joined. Secondary battery to have.
前記緩衝ワッシャーは、前記カシメ部が前記端子に溶接された状態で、外周部が溶融し、内周部が前記多孔質体の状態が維持された状態である請求項1に記載の二次電池。 The secondary battery according to claim 1, wherein the buffer washer is in a state in which the caulked portion is welded to the terminal, the outer peripheral portion is melted, and the inner peripheral portion is maintained in the state of the porous body. .. 前記緩衝ワッシャーは、
前記カシメ部側に少なくとも前記カシメ部の素材を含む溶加材で形成される第1の層と、
前記端子側に前記端子の素材と同一素材の溶加材で形成される第2の層と、を有する請求項1又は2に記載の二次電池。
The buffer washer
A first layer formed of a filler material containing at least the material of the crimped portion on the crimped portion side, and
The secondary battery according to claim 1 or 2, further comprising a second layer formed of a filler material of the same material as the material of the terminal on the terminal side.
前記緩衝ワッシャーは、外周側の前記多孔質体が内周側の前記多孔質体よりも密度が高く形成される請求項1又は2に記載の二次電池。 The secondary battery according to claim 1 or 2, wherein the buffer washer is formed so that the porous body on the outer peripheral side has a higher density than the porous body on the inner peripheral side. 前記極柱、前記緩衝ワッシャー及び前記端子は、正極側と負極側にそれぞれ設けられ、
正極側の前記極柱は、正極側の前記緩衝ワッシャー及び前記端子は、異なる種類のアルミニウムであり、
負極側の前記極柱及び前記端子は、銅であり、
正極側の前記緩衝ワッシャーは、銅と他の種類の物質を含む銅化合物である請求項1又は2に記載の二次電池。
The pole column, the buffer washer, and the terminal are provided on the positive electrode side and the negative electrode side, respectively.
The pole column on the positive electrode side has the buffer washer and the terminal on the positive electrode side made of different types of aluminum.
The pole column and the terminal on the negative electrode side are made of copper.
The secondary battery according to claim 1 or 2, wherein the buffer washer on the positive electrode side is a copper compound containing copper and another kind of substance.
前記極柱、前記緩衝ワッシャー及び前記端子は、正極側と負極側にそれぞれ設けられ、
正極側の前記極柱と、正極側の前記緩衝ワッシャー及び前記端子は、異なる種類のアルミニウムであり、
負極側の前記極柱は、銅であり、
負極側の前記端子は、正極側の前記緩衝ワッシャーと同一種のアルミニウムであり、
正極側の前記緩衝ワッシャーは、銅と他の種類の物質を含む銅化合物である請求項1又は2に記載の二次電池。
The pole column, the buffer washer, and the terminal are provided on the positive electrode side and the negative electrode side, respectively.
The pole column on the positive electrode side and the buffer washer and the terminal on the positive electrode side are made of different types of aluminum.
The pole column on the negative electrode side is copper and
The terminal on the negative electrode side is made of the same type of aluminum as the buffer washer on the positive electrode side.
The secondary battery according to claim 1 or 2, wherein the buffer washer on the positive electrode side is a copper compound containing copper and another kind of substance.
前記カシメ部は、前記極柱に取り付けられた状態で、前記端子に対向する面が前記端子に向かって凸形状となる形状を有する請求項1乃至6のいずれか1項に記載の二次電池。 The secondary battery according to any one of claims 1 to 6, wherein the crimped portion has a shape in which a surface facing the terminal has a convex shape toward the terminal in a state of being attached to the pole pillar. .. ケースと、
前記ケースの内部に収納される発電体から電力を取り出す極柱と、
前記ケースを密封する蓋と、
前記蓋の外部に設けられる端子と、
前記極柱の端部に設けられ、前記蓋の外側において前記極柱の部材がカシメられた状態で前記端子に押しつけられたカシメ部と、
前記カシメ部と前記端子との間に設けられ、溶加材が多孔質体となるように形成された緩衝ワッシャーと、を有する二次電池の前記カシメ部に対する溶接方法であって、
前記カシメ部の外周縁を含む領域に帯状のエッジ検出領域を設定し、
前記エッジ検出領域から得られた画像に対して前記蓋の表面を底にした高さ方向の高さに応じて明から暗に転じる画像を生成し、
前記エッジ検出領域から得られた画像の明部と暗部との境界線に基づき、溶接中心線を前記カシメ部の淵に沿って設定し、
前記溶接中心線に沿って溶接用レーザーを照射する二次電池のカシメ部に対する溶接方法。
With the case
A pole pillar that extracts electric power from the generator housed inside the case,
A lid that seals the case and
Terminals provided on the outside of the lid and
A crimped portion provided at the end of the pole pillar and pressed against the terminal in a state where the member of the pole pillar is crimped on the outside of the lid.
A welding method for the caulked portion of a secondary battery having a buffer washer provided between the caulked portion and the terminal and formed so that the filler metal is a porous body.
A band-shaped edge detection region is set in the region including the outer peripheral edge of the crimped portion, and the band-shaped edge detection region is set.
With respect to the image obtained from the edge detection region, an image that changes from light to dark according to the height in the height direction with the surface of the lid as the bottom is generated.
Based on the boundary line between the bright part and the dark part of the image obtained from the edge detection region, the welding center line is set along the edge of the crimped part.
A welding method for a caulked portion of a secondary battery that irradiates a welding laser along the welding center line.
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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06231740A (en) * 1993-02-03 1994-08-19 Matsushita Electric Ind Co Ltd Manufacture of battery and assembling sealing plate thereof

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06231740A (en) * 1993-02-03 1994-08-19 Matsushita Electric Ind Co Ltd Manufacture of battery and assembling sealing plate thereof

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