JP6160049B2 - Power storage device manufacturing method and power storage device - Google Patents

Power storage device manufacturing method and power storage device Download PDF

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JP6160049B2
JP6160049B2 JP2012212866A JP2012212866A JP6160049B2 JP 6160049 B2 JP6160049 B2 JP 6160049B2 JP 2012212866 A JP2012212866 A JP 2012212866A JP 2012212866 A JP2012212866 A JP 2012212866A JP 6160049 B2 JP6160049 B2 JP 6160049B2
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shaft portion
injection hole
sealing plug
liquid injection
power storage
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JP2014067626A (en
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眞弘 内田
眞弘 内田
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GS Yuasa International 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
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries
    • 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
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50Manufacturing or production processes characterised by the final manufactured product

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Description

本発明は、軸部と、前記軸部から前記軸部の軸芯と交差する方向に延出する鍔部とを備えて構成された封止栓を使用する蓄電装置の製造方法、及び、蓄電装置に関する。 The present invention relates to a method for manufacturing a power storage device using a sealing plug that includes a shaft portion and a flange portion that extends from the shaft portion in a direction that intersects the axis of the shaft portion, and a power storage device. Relates to the device.

かかる封止栓は、例えば、蓄電要素を収納した装置筐体に対して、装置筐体の側面に形成した注液孔から電解液を注液する形式の蓄電装置等に使用される。
この注液孔は封止栓によって封止する必要があり、封止栓の構造としては、従来、例えば、下記特許文献1にも記載のように、軸部とその軸部の軸芯と直交する方向に軸部から延出する鍔部とを有する構造として、上記軸部を注液孔に嵌入させると共に、鍔部の周囲をレーザ溶接等の溶接技術によって装置筐体と溶接することで封止する技術が考えられている。
Such a sealing plug is used for, for example, a power storage device of a type in which an electrolytic solution is injected from a liquid injection hole formed on a side surface of the device housing with respect to the device housing containing the power storage element.
This liquid injection hole needs to be sealed with a sealing plug, and as a structure of the sealing plug, for example, as described in Patent Document 1 below, the shaft portion and the shaft core of the shaft portion are orthogonal to each other. As a structure having a flange portion extending from the shaft portion in the direction to be sealed, the shaft portion is fitted into the liquid injection hole, and the periphery of the flange portion is sealed by welding to the apparatus housing by a welding technique such as laser welding. Technology to stop is considered.

特開2000−106156号公報JP 2000-106156 A

しかしながら、上記従来構成では、封止栓の鍔部と装置筐体とを溶接する際に、溶接不良が発生し、注液孔の封止が不完全となってしまう場合があった。
本発明は、かかる実情に鑑みてなされたものであって、その目的は、封止栓による封止を的確に行えるようにする点にある。
However, in the above-described conventional configuration, when welding the flange portion of the sealing plug and the apparatus housing, a welding failure may occur, and sealing of the liquid injection hole may be incomplete.
The present invention has been made in view of such circumstances, and an object thereof is to enable accurate sealing with a sealing plug.

又、本出願の第1の発明は、軸部と前記軸部から前記軸部の軸芯と交差する方向に延出する鍔部とを備えた封止栓を、装置筐体の側面に形成された注液孔に、前記軸部が前記注液孔に嵌入する状態で装着し、前記鍔部における延出側の端部を前記装置筐体と溶接する蓄電装置の製造方法において、前記封止栓の前記鍔部は、前記軸部の先端側の面において、前記延出側の端部が前記軸部側の箇所よりも前記軸部の先端側に位置するように構成され、前記封止栓の前記注液孔への嵌入操作において、前記延出側の端部と前記装置筐体とが接触する状態を維持しながら、前記軸部の先端側から基端側に向かう方向で作用する押圧力によって、前記延出側の端部が前記軸部の先端側から基端側に向かう方向に変位する状態で前記鍔部を変形させ、前記延出側の端部と前記装置筐体とが接触している状態で、前記延出側の端部と前記装置筐体とを溶接する。 According to a first aspect of the present application, a sealing plug including a shaft portion and a flange portion extending from the shaft portion in a direction intersecting the axis of the shaft portion is formed on a side surface of the apparatus housing. In the method of manufacturing a power storage device, the shaft portion is attached to the liquid injection hole in a state where the shaft portion is fitted into the liquid injection hole, and an end portion on the extending side of the flange portion is welded to the device housing. The collar portion of the stopper is configured such that, on the surface on the distal end side of the shaft portion, the end portion on the extending side is positioned closer to the distal end side of the shaft portion than the portion on the shaft portion side, In the fitting operation of the stopper plug into the liquid injection hole, the operation is performed in the direction from the distal end side to the proximal end side of the shaft portion while maintaining the state in which the end portion on the extension side and the device housing are in contact with each other. With the pressing force, the end portion on the extending side is displaced in the direction from the distal end side to the proximal end side of the shaft portion, and the flange portion is deformed. In a state where the end portion of the extending side and the device housing is in contact, to weld the said device housing and the extension-side end.

すなわち、封止栓を蓄電装置の注液孔に嵌入操作する際、軸部の注液孔への挿入に伴って、先ず、鍔部の延出側の端部(鍔部の端縁側部分)が装置筐体の表面と接触する。
この状態では、鍔部の軸部側箇所は、装置筐体の表面から浮いている。
この後、更に、封止栓を注液孔に押し込むと、鍔部の延出側の端部と装置筐体表面とが接触する状態を維持したまま、鍔部の軸部側箇所も装置筐体表面に接近して行く。
従って、封止栓を注液孔に嵌入操作する際に、鍔部の軸部先端側の面における、装置筐体の表面に対する延出側の端部と軸部側の箇所との距離の差に応じて、一定の幅をもって、鍔部の延出側の端部と装置筐体表面との接触状態を維持できるので、蓄電装置の製造工程において、封止栓と装置筐体との溶接作業を的確に行えるものとなった。
That is, when the sealing plug is inserted into the liquid injection hole of the power storage device, first, the end portion on the extension side of the collar portion (the edge side portion of the collar portion) is inserted along with the insertion of the shaft portion into the liquid injection hole. Contacts the surface of the device housing.
In this state, the shaft portion side portion of the flange portion is floating from the surface of the apparatus housing.
After that, when the sealing plug is further pushed into the liquid injection hole, the shaft side portion of the collar part is also attached to the apparatus housing while maintaining the state where the end part of the collar part on the extension side is in contact with the surface of the apparatus housing. Approach the body surface.
Therefore, when the sealing plug is inserted into the liquid injection hole, the difference in the distance between the end portion on the extending side and the portion on the shaft portion side with respect to the surface of the apparatus housing on the surface on the distal end side of the shaft portion of the collar portion. Accordingly, the contact state between the end portion of the flange extending side and the surface of the device housing can be maintained with a certain width, so that the welding operation between the sealing plug and the device housing is performed in the manufacturing process of the power storage device. Can be performed accurately.

又、封止栓を蓄電装置の注液孔に嵌入操作する際、軸部の注液孔への挿入に伴って、鍔部の延出側の端部(鍔部の端縁側部分)が先行して装置筐体の表面と接触した後、更に、封止栓を注液孔に押し込むと、鍔部の延出側の端部と装置筐体表面とが接触する状態を維持したまま鍔部が変形して、鍔部の軸部側箇所も装置筐体表面に接近して行く。
このように、封止栓を注液孔に嵌入操作する際に、鍔部の変形を利用することで、一定の幅をもって、封止栓の鍔部の延出側端部と装置筐体表面とが接触している状態を維持できるので、蓄電装置の製造工程において、封止栓と装置筐体との溶接作業を的確に行えるものとなった。
In addition, when the sealing plug is inserted into the liquid injection hole of the power storage device, the end of the flange extending side (the edge side of the flange) precedes as the shaft is inserted into the liquid injection hole. When the sealing plug is further pushed into the liquid injection hole after contacting the surface of the device casing, the flange portion is maintained while the end of the flange portion on the extension side is in contact with the surface of the device casing. Is deformed, and the shaft side portion of the collar portion also approaches the surface of the apparatus housing.
Thus, when inserting the sealing plug into the liquid injection hole, by utilizing the deformation of the flange, the extension side end of the flange of the sealing plug and the surface of the device casing are fixed with a certain width. Can be maintained in contact with each other, so that the welding operation of the sealing plug and the device housing can be performed accurately in the manufacturing process of the power storage device.

本出願の第2の発明は、装置筐体の側面に注液孔が形成され、前記注液孔が封止栓にて封止され、前記封止栓は、前記注液孔に嵌入する軸部と、前記軸部から前記軸部の軸芯と交差する方向に延出する鍔部とを備えて構成され、前記鍔部における延出側の端部が前記装置筐体に溶接されている蓄電装置において、前記封止栓の前記鍔部は、前記軸部の先端側の面において、前記延出側の端部が前記軸部側の箇所よりも前記軸部の先端側に位置し、且つ、前記封止栓の前記注液孔への嵌入操作に伴って、前記延出側の端部と前記装置筐体とが接触する状態を維持しながら、前記軸部の先端側から基端側に向かう方向で作用する押圧力によって、前記延出側の端部が前記軸部の先端側から基端側に向かう方向に変位する状態で変形するように構成され、前記延出側の端部と前記装置筐体とが接触している状態で、前記延出側の端部と前記装置筐体とが溶接されている。 According to a second aspect of the present application, a liquid injection hole is formed on a side surface of an apparatus housing, the liquid injection hole is sealed with a sealing plug, and the sealing plug is a shaft that fits into the liquid injection hole. And a flange portion extending from the shaft portion in a direction intersecting the axis of the shaft portion, and an end portion on the extending side of the flange portion is welded to the device casing. In the power storage device, the flange portion of the sealing plug is located on the distal end side of the shaft portion in the surface on the distal end side of the shaft portion, with the end portion on the extending side being located on the distal end side of the shaft portion side. In addition, with the operation of fitting the sealing plug into the liquid injection hole, the base end from the distal end side of the shaft portion is maintained while maintaining a state in which the end portion on the extension side and the apparatus housing are in contact with each other. The extended end portion is deformed in a state of being displaced in a direction from the distal end side to the proximal end side of the shaft portion by a pressing force acting in a direction toward the side. It is, in a state where said extending side end and the device housing is in contact, with the extending side of the end portion and the device housing are welded.

すなわち、この封止栓を蓄電装置の注液孔に嵌入操作する際、軸部の注液孔への挿入に伴って、先ず、鍔部の延出側の端部(鍔部の端縁側部分)が装置筐体の表面と接触する。
この状態では、鍔部の軸部側箇所は、装置筐体の表面から浮いている。
この後、更に、封止栓を注液孔に押し込むと、鍔部の延出側の端部と装置筐体表面とが接触する状態を維持したまま鍔部が変形して、鍔部の軸部側箇所も装置筐体表面に接近して行く。
従って、封止栓を注液孔に嵌入操作する際に、鍔部の軸部先端側の面における、装置筐体の表面に対する延出側の端部と軸部側の箇所との距離の差に応じて、一定の幅をもって、鍔部の延出側の端部と装置筐体表面との接触状態を維持できる。
このように、蓄電装置の注液孔の封止構造として、封止栓の鍔部の延出側端部と装置筐体表面とが適正に接触している状態を容易に作り出すことができる封止構造となっているので、装置筐体と封止栓との溶接作業を的確に行える蓄電装置を提供できるものとなった。
That is, when the sealing plug is inserted into the liquid injection hole of the power storage device, the end of the flange portion on the extension side (the edge side portion of the flange portion) is first inserted into the liquid injection hole of the shaft portion. ) Contacts the surface of the device housing.
In this state, the shaft portion side portion of the flange portion is floating from the surface of the apparatus housing.
After this, when the sealing plug is further pushed into the liquid injection hole, the collar part is deformed while the end part of the collar part on the extension side is kept in contact with the apparatus housing surface, and the shaft of the collar part is deformed. The part side part also approaches the surface of the device casing.
Therefore, when the sealing plug is inserted into the liquid injection hole, the difference in the distance between the end portion on the extending side and the portion on the shaft portion side with respect to the surface of the apparatus housing on the surface on the distal end side of the shaft portion of the collar portion. Accordingly, it is possible to maintain the contact state between the end of the extending portion of the flange portion and the surface of the apparatus housing with a certain width.
As described above, as a sealing structure for the liquid injection hole of the power storage device, a sealed state that can easily create a state in which the extended side end of the flange portion of the sealing plug and the surface of the device housing are in proper contact with each other. Since it has a stop structure, it is possible to provide a power storage device that can accurately perform welding work between the device casing and the sealing plug.

本出願の発明によれば、鍔部の延出側端部と溶接相手側表面とが適正に接触している状態を容易に作り出すことができ、封止栓による封止を的確に行えるものとなった。   According to the invention of the present application, it is possible to easily create a state where the extending side end portion of the flange portion and the welding counterpart side surface are in proper contact with each other, and the sealing with the sealing plug can be accurately performed. became.

本発明の実施の形態にかかる蓄電装置の外観斜視図1 is an external perspective view of a power storage device according to an embodiment of the present invention. 本発明の実施の形態にかかる蓄電装置の内部構成を示す斜視図The perspective view which shows the internal structure of the electrical storage apparatus concerning embodiment of this invention 本発明の実施の形態にかかる封止栓取り付け前の蓄電装置の外観斜視図The external perspective view of the electrical storage apparatus before the sealing plug attachment concerning embodiment of this invention 本発明の実施の形態にかかる封止栓の拡大断面図The expanded sectional view of the sealing stopper concerning an embodiment of the invention 本発明の実施の形態にかかる上方側からの封止栓の斜視図The perspective view of the sealing stopper from the upper side concerning embodiment of this invention 本発明の実施の形態にかかる下方側からの封止栓の斜視図The perspective view of the sealing stopper from the downward side concerning embodiment of this invention 本発明の実施の形態にかかる封止栓の挿入状態を示す断面図Sectional drawing which shows the insertion state of the sealing plug concerning embodiment of this invention 本発明の実施の形態にかかる封止栓の挿入状態を示す断面図Sectional drawing which shows the insertion state of the sealing plug concerning embodiment of this invention 本発明の実施の形態にかかる封止栓と装置筐体との溶接作業を示す斜視図The perspective view which shows the welding operation of the sealing stopper and apparatus housing | casing concerning embodiment of this invention. 本発明の別実施形態にかかる封止栓の断面図Sectional drawing of the sealing stopper concerning another embodiment of this invention.

以下、本発明の封止栓及びその封止栓を使用した蓄電装置を、蓄電装置の1例である電池、特に二次電池として構成した場合の実施の形態を、図面に基づいて説明する。
本実施の形態では、上記二次電池として非水電解液二次電池(より具体的にはリチウムイオン電池)を例示して説明する。
Hereinafter, an embodiment in which a sealing plug of the present invention and a power storage device using the sealing plug are configured as a battery, particularly a secondary battery, as an example of the power storage device will be described with reference to the drawings.
In the present embodiment, a nonaqueous electrolyte secondary battery (more specifically, a lithium ion battery) will be described as an example of the secondary battery.

図1の斜視図に示すように、非水電解液二次電池RBは、缶体1の開放面に蓋部2を被せて溶接して構成した装置筐体BC(以下において、単に「筐体BC」と称する)を有している。蓋部2は、短冊状の長方形の板材にて形成され、それの筐体BC外方側となる面に正極の電極端子である端子ボルト5と負極の電極端子である端子ボルト7とが取り付けられている。
缶体1は蓋部2の形状に合わせて扁平形状の直方体であり、従って、筐体BC全体としても扁平な略直方体形状を有しており、筐体BCの内部空間も扁平な略直方体形状となっている。
缶体1及び蓋部2は、いずれも、アルミニウムを主成分とする金属材料にて形成されている。
As shown in the perspective view of FIG. 1, the non-aqueous electrolyte secondary battery RB includes a device casing BC (hereinafter referred to simply as “casing”) that is configured by welding a cover 2 on an open surface of a can body 1. BC ”). The lid portion 2 is formed of a strip-shaped rectangular plate material, and a terminal bolt 5 that is a positive electrode terminal and a terminal bolt 7 that is a negative electrode terminal are attached to a surface on the outer side of the casing BC. It has been.
The can 1 is a flat rectangular parallelepiped in accordance with the shape of the lid portion 2, and thus has a flat and substantially rectangular parallelepiped shape as a whole of the casing BC, and the internal space of the casing BC is also flat and substantially rectangular. It has become.
Both the can 1 and the lid 2 are made of a metal material mainly composed of aluminum.

筐体BCの内方側には、図2において2点鎖線で示す発電要素3と集電体4,6とが電解液に一部浸される状態で収納配置されている。図2は、缶体1を除いた状態で、下方側から見上げた斜視図として、筐体BCの内方側を示している。
集電体4,6は、発電要素3と端子ボルト5,7とを電気的に接続するための部材であり、何れも金属材料にて形成されている。
集電体4と集電体6とは、略同一形状のものが対称に配置される関係となっているが、材質が異なっており、正極側の集電体4はアルミニウムを主成分とする材料にて形成され、負極側の集電体6は銅を主成分とする材料にて形成されている。
On the inner side of the casing BC, the power generation element 3 and current collectors 4 and 6 indicated by a two-dot chain line in FIG. 2 are housed and arranged in a state of being partially immersed in the electrolyte. FIG. 2 shows the inner side of the casing BC as a perspective view looking up from the lower side with the can 1 removed.
The current collectors 4 and 6 are members for electrically connecting the power generating element 3 and the terminal bolts 5 and 7, both of which are formed of a metal material.
The current collector 4 and the current collector 6 have a relationship in which substantially the same shape is arranged symmetrically, but the materials are different, and the current collector 4 on the positive electrode side is mainly composed of aluminum. The current collector 6 on the negative electrode side is formed of a material mainly composed of copper.

集電体4,6の概略形状は、上記の金属材料の板状部材を、筐体BCの短辺側の側面に沿う姿勢で屈曲形成して略L字状としており、端子ボルト5,7の配置面である蓋部2の表面に沿って延びる部分と、蓋部2の長手方向端部付近で下方側へ90度屈曲して、蓋部2の法線方向に延びる縦姿勢部分とが連なる形状を有している。集電体4,6の上記縦姿勢部分において、更に発電要素3側に屈曲させて、発電要素3と接続するための二股状の接続部4a,6aが形成されている。   The schematic shape of the current collectors 4 and 6 is such that the above-described metal material plate-like member is bent and formed in a posture along the side surface on the short side of the casing BC to have a substantially L shape. A portion extending along the surface of the lid portion 2 that is an arrangement surface of the lid portion, and a vertical posture portion that is bent 90 degrees downward near the longitudinal end portion of the lid portion 2 and extends in the normal direction of the lid portion 2. It has a continuous shape. Bifurcated connecting portions 4a and 6a for connecting to the power generation element 3 are formed by bending the current collectors 4 and 6 to the power generation element 3 side.

発電要素3は、長尺帯状に形成された箔状正極板と長尺帯状に形成された箔状負極板とからなる一対の電極板の夫々に、活物質層を表裏両面の表面に塗布により形成して、それらを長尺帯状のシート状に形成したセパレータを挟んで巻回する状態で積層した、いわゆる巻回型の発電要素として構成されている。
箔状正極板及び箔状負極板における活物質層の形成状態は、夫々の横幅方向端部に、活物質層を塗布形成しない幅狭帯状の領域を設定し、それらの領域を、集電体4,6との接続のための未塗工部3a,3bとしている。
箔状正極板の未塗工部3aと、箔状負極板の未塗工部3bとは、図2に概略的に示すように、上記横幅方向で反対側(逆側)の端部に位置しており、箔状正極板の未塗工部3aは、箔状負極板及びセパレータの端縁よりも上記横幅方向に突出し、箔状負極板の未塗工部3bは、箔状正極板及びセパレータの端縁よりも上記横幅方向に突出している。
The power generating element 3 is formed by applying an active material layer to both the front and back surfaces of each of a pair of electrode plates including a foil-like positive electrode plate formed in a long belt shape and a foil-like negative electrode plate formed in a long belt shape. It is configured as a so-called winding type power generation element that is formed and stacked in a state of being wound around a separator that is formed into a long belt-like sheet.
The formation state of the active material layer in the foil-like positive electrode plate and the foil-like negative electrode plate is set to a narrow band-like region where the active material layer is not applied and formed at each lateral width direction end, and these regions are used as current collectors. 4 and 6 are uncoated portions 3a and 3b.
The uncoated portion 3a of the foil-shaped positive electrode plate and the uncoated portion 3b of the foil-shaped negative electrode plate are positioned at opposite ends (reverse sides) in the lateral width direction, as schematically shown in FIG. The uncoated portion 3a of the foil-shaped positive electrode plate protrudes in the lateral width direction from the edges of the foil-shaped negative electrode plate and the separator, and the uncoated portion 3b of the foil-shaped negative electrode plate includes the foil-shaped positive electrode plate and It protrudes in the lateral width direction from the edge of the separator.

上記構成の発電要素3は、未塗工部3a,3bが集電体4,6の接続部4a,6aと超音波溶接にて溶接されて電気的に接続される。
この集電体4,6は、端子ボルト5,7と共に蓋部2に固定されて、正極側の端子ボルト5は正極側の集電体4に電気的に接続され、負極側の端子ボルト7は負極側の集電体6に電気的に接続されている。
正極側の集電体4は、端子ボルト5の頭部側に一体形成されているリベット8を経て端子ボルト5に電気的に接続され、リベット8は、集電体4,集電体4及びリベット8と蓋部2との間の電気的絶縁のための下部ガスケット12,蓋部2,リベット8を含む端子ボルト5と蓋部2との間の電気的絶縁のための上部ガスケット11を貫通した状態で、筐体BC内方側端部でかしめられ、これによって集電体4を蓋部2に固定している。
負極側も同様の構成であり、負極側の集電体6は、端子ボルト7の頭部側に一体形成されているリベット15を経て端子ボルト7に電気的に接続され、リベット15は、集電体6,集電体6及びリベット15と蓋部2との間の電気的絶縁のための下部ガスケット18,蓋部2,リベット15を含む端子ボルト7と蓋部2との間の電気的絶縁のための上部ガスケット17を貫通した状態で、筐体BC内方側端部でかしめられ、これによって集電体6を蓋部2に固定している。
In the power generation element 3 having the above-described configuration, the uncoated portions 3a and 3b are welded and electrically connected to the connection portions 4a and 6a of the current collectors 4 and 6 by ultrasonic welding.
The current collectors 4 and 6 are fixed to the lid portion 2 together with the terminal bolts 5 and 7, the positive terminal bolt 5 is electrically connected to the positive current collector 4, and the negative terminal bolt 7. Is electrically connected to the current collector 6 on the negative electrode side.
The current collector 4 on the positive electrode side is electrically connected to the terminal bolt 5 via a rivet 8 integrally formed on the head side of the terminal bolt 5, and the rivet 8 includes the current collector 4, the current collector 4, and the current collector 4. Lower gasket 12 for electrical insulation between rivet 8 and lid 2, upper gasket 11 for electrical insulation between lid 2 and terminal bolt 5 including lid 2 and rivet 8 and lid 2 In this state, the current collector 4 is caulked at the inner end portion of the casing BC, thereby fixing the current collector 4 to the lid portion 2.
The negative electrode side has the same configuration, and the negative electrode side current collector 6 is electrically connected to the terminal bolt 7 via a rivet 15 integrally formed on the head side of the terminal bolt 7. The electrical current between the terminal 6 including the electrical current 6, the current collector 6 and the lower gasket 18 for electrical insulation between the rivet 15 and the lid 2, the lid 2 and the rivet 15 and the lid 2 The current collector 6 is fixed to the lid portion 2 by being caulked at the inner end of the casing BC in a state of passing through the upper gasket 17 for insulation.

二次電池RBの製造工程においては、上述のように、蓋部2に対して端子ボルト5,7及び集電体4,6を、リベット8,15のかしめによって組み付けた後、集電体4,6の接続部4a,6aと発電要素3の未塗工部3a,3bとを溶接する。
その蓋部2と発電要素3とを一体に組み付けたものを缶体1に挿入し、蓋部2の端縁と缶体1の開放端をレーザ溶接にて溶接する。
この工程まで完了した状態の二次電池RBの外観斜視図を図3に示す。
この後、二次電池RBの筐体BC内に電解液を注液する。
電解液は、図2及び図3に示す注液孔21から注液する。
注液孔21は、蓋部2に貫通孔として形成されており、貫通方向視で円形形状の孔としている。
In the manufacturing process of the secondary battery RB, as described above, the terminal bolts 5 and 7 and the current collectors 4 and 6 are assembled to the lid portion 2 by caulking the rivets 8 and 15, and then the current collector 4 , 6 and the uncoated portions 3a, 3b of the power generating element 3 are welded.
An assembly in which the lid 2 and the power generation element 3 are assembled together is inserted into the can 1 and the edge of the lid 2 and the open end of the can 1 are welded by laser welding.
FIG. 3 shows an external perspective view of the secondary battery RB in a state completed up to this step.
Thereafter, an electrolytic solution is injected into the casing BC of the secondary battery RB.
The electrolytic solution is injected from the injection hole 21 shown in FIGS.
The liquid injection hole 21 is formed as a through hole in the lid portion 2 and has a circular shape when viewed in the through direction.

所定の量の電解液の注液後は、蓋部2の注液孔21を、封止栓22にて封止する。
封止栓22は、蓋部2と同様のアルミニウムを主成分とする金属材料にて形成される金属部材であり、図4の断面図、図5の上方側からの斜視図、及び、図6の下方側からの斜視図に示すように、注液孔21に隙間無く嵌入する軸部23と、軸部23の一端側に配置される鍔部24とからなっている。
軸部23は、注液孔21の形状と適合する円柱形状に形成されている。
鍔部24は、軸部23から軸部23の軸芯と交差(略直交)する方向に板状に延出しており、軸部23の端部に連設される平坦部24aと、その平坦部24aから軸部23の径方向に延出する状態で、軸部23の他端側(先端側)に屈曲した姿勢の屈曲部24bとからなる。平坦部24aと屈曲部24bとは、軸部23の軸芯を中心として同心円状に配置されており、全体としては、軸部23の軸芯方向視で円形をなす傘形状となっている。
After injecting a predetermined amount of electrolyte, the injection hole 21 of the lid 2 is sealed with a sealing plug 22.
The sealing plug 22 is a metal member formed of a metal material mainly composed of aluminum similar to the lid 2, and is a cross-sectional view of FIG. 4, a perspective view from the upper side of FIG. 5, and FIG. 6. As shown in the perspective view from below, the shaft portion 23 is fitted into the liquid injection hole 21 without a gap, and the flange portion 24 is disposed on one end side of the shaft portion 23.
The shaft portion 23 is formed in a cylindrical shape that matches the shape of the liquid injection hole 21.
The flange portion 24 extends in a plate shape from the shaft portion 23 in a direction intersecting (substantially orthogonal) with the axis of the shaft portion 23, and has a flat portion 24 a continuously provided at the end portion of the shaft portion 23, and the flat portion thereof. It comprises a bent portion 24b that is bent to the other end side (tip side) of the shaft portion 23 in a state of extending in the radial direction of the shaft portion 23 from the portion 24a. The flat portion 24a and the bent portion 24b are arranged concentrically around the axis of the shaft portion 23, and as a whole, the flat portion 24a and the bent portion 24b have an umbrella shape that is circular when viewed in the axial direction of the shaft portion 23.

電解液の注液完了後に、この封止栓22の軸部23を注液孔21に嵌入させる。
軸部23の先端を注液孔21に嵌め込み、更に注液孔21の深部へと封止栓22を押し込んで行くと、図7の拡大断面図に示すように、軸部23の径方向での鍔部24の先端(屈曲部24bの先端)が蓋部2の表面と接触する。
この鍔部24の先端と蓋部2表面との接触部分がレーザ溶接による溶接対象位置となるので、この溶接対象物の接触によって良好なレーザ溶接が可能となっている。
鍔部24は、上述のように傘形状となっており、鍔部24における軸部23の先端側の面(蓋部2の表面を向いている面)では、延出側の端部(外周側の端部)が軸部23側の箇所よりも軸部23の先端側(蓋部2の表面側)に位置しているので、この時点では、軸部23の基端部付近は、蓋部2の表面から浮いている。
After the electrolyte injection is completed, the shaft portion 23 of the sealing plug 22 is inserted into the injection hole 21.
When the tip of the shaft part 23 is fitted into the liquid injection hole 21 and the sealing plug 22 is pushed into the deep part of the liquid injection hole 21, as shown in the enlarged sectional view of FIG. The front end of the collar portion 24 (the front end of the bent portion 24 b) is in contact with the surface of the lid portion 2.
Since the contact portion between the tip of the flange 24 and the surface of the lid 2 is a position to be welded by laser welding, good laser welding is possible by the contact of the welding object.
As described above, the collar portion 24 has an umbrella shape, and the end-side end portion (outer periphery) of the collar portion 24 on the tip-side surface of the shaft portion 23 (the surface facing the surface of the lid portion 2). Since the end portion on the side is located closer to the distal end side (surface side of the lid portion 2) of the shaft portion 23 than the portion on the shaft portion 23 side, at this time, the vicinity of the base end portion of the shaft portion 23 is the lid. It floats from the surface of the part 2.

図7に示す状態から、更に封止栓22を押し込むと、図8の拡大断面図に示す状態となる。
封止栓22の挿入に伴って、鍔部24の延出側の端部(外周側の端部)に対して、軸部23の先端側から基端側に向かう方向で押圧力が作用するが、鍔部24は金属材料の板材であるので、その押圧力に対して変形し易く、図8に示すように、鍔部24の傘形状がつぶれて平板状へと変形していく。
鍔部24がこのように変形しても、軸部23の径方向における鍔部24の先端は、蓋部2との接触を維持しており、良好なレーザ溶接が可能な状態を維持している。
すなわち、封止栓22を注液孔21に嵌入操作する際に、一定の幅をもって、軸部23の径方向における鍔部24の先端が蓋部2の表面との接触を維持しており、封止栓22の鍔部24と蓋部2の表面とが適切に接触する状態を容易に作り出すことができる。
図7あるいは図8に示すように封止栓22を注液孔21に嵌入させた状態で、図9の斜視図に示すように、鍔部24の延出側端部にレーザビームLBを集光し、図9において矢印Aで示すように、鍔部24の全周に亘って溶接する。
この溶接によって筐体BCの封止が完了し、予備充電等を経て二次電池RBとして完成する。
When the sealing plug 22 is further pushed in from the state shown in FIG. 7, the state shown in the enlarged sectional view of FIG. 8 is obtained.
With the insertion of the sealing plug 22, a pressing force acts in the direction from the distal end side of the shaft portion 23 toward the proximal end side with respect to the extension side end portion (outer end portion) of the flange portion 24. However, since the collar portion 24 is a metal plate, it is easily deformed with respect to the pressing force, and the umbrella shape of the collar portion 24 is crushed and deformed into a flat plate shape as shown in FIG.
Even if the flange portion 24 is deformed in this way, the tip end of the flange portion 24 in the radial direction of the shaft portion 23 maintains contact with the lid portion 2 and maintains a state where good laser welding is possible. Yes.
That is, when the sealing plug 22 is inserted into the liquid injection hole 21, the tip of the flange portion 24 in the radial direction of the shaft portion 23 maintains contact with the surface of the lid portion 2 with a certain width. It is possible to easily create a state in which the flange 24 of the sealing plug 22 and the surface of the lid 2 are in proper contact.
With the sealing plug 22 fitted in the liquid injection hole 21 as shown in FIG. 7 or FIG. 8, the laser beam LB is collected at the end on the extending side of the flange 24 as shown in the perspective view of FIG. As shown by arrow A in FIG. 9, welding is performed over the entire circumference of the flange 24.
By this welding, sealing of the casing BC is completed, and the secondary battery RB is completed through preliminary charging or the like.

〔別実施形態〕
以下、本発明の別実施形態を列記する。
(1)上記実施の形態では、封止栓22の鍔部24の形状として、軸部23の一端に連設する平坦部24aと屈曲部24bとからなる形状を例示しているが、鍔部24の具体形状は種々に変更可能であり、例えば、図10(a)の断面図に示すような、鍔部24の略全体が皿状に湾曲した形状や、図10(b)の断面図に示すような、軸部23の一端に連設する平坦部24cの端縁から、蓋部2の存在側へ略90度の角度で軸部23の先端側に屈曲した屈曲部24dが延出する形状としても良い。
何れにしても、鍔部24における軸部23の先端側の面において、延出側の端部が軸部23側の箇所よりも軸部23の先端側に位置する形状を有して、封止栓22の注液孔21への挿入に伴って、蓋部2側からの押圧力によって鍔部24が変形し、その変形の過程で、鍔部24の先端が蓋部2の表面と接触を維持する形状であれば良い。
[Another embodiment]
Hereinafter, other embodiments of the present invention will be listed.
(1) In the above embodiment, the shape of the flange portion 24 of the sealing plug 22 is exemplified by the shape of the flat portion 24a and the bent portion 24b that are connected to one end of the shaft portion 23. The specific shape of 24 can be variously changed. For example, as shown in the cross-sectional view of FIG. 10 (a), the substantially entire shape of the collar portion 24 is curved in a dish shape, or the cross-sectional view of FIG. 10 (b). A bent portion 24d that is bent toward the distal end side of the shaft portion 23 extends from the edge of the flat portion 24c continuously provided at one end of the shaft portion 23 to the existing side of the lid portion 2 at an angle of approximately 90 degrees. It is good also as a shape to do.
In any case, on the surface on the distal end side of the shaft portion 23 in the flange portion 24, the extending end portion is positioned closer to the distal end side of the shaft portion 23 than the portion on the shaft portion 23 side, and is sealed. As the stop plug 22 is inserted into the liquid injection hole 21, the flange portion 24 is deformed by the pressing force from the lid portion 2 side, and the tip of the flange portion 24 contacts the surface of the lid portion 2 in the process of the deformation. Any shape can be used as long as the shape is maintained.

(2)上記実施の形態では、注液孔21を円形断面の貫通孔として形成し、それと対応させて封止栓22の軸部23の形状を円柱形状とする場合を例示しているが、注液孔21を矩形断面の貫通孔とし、封止栓22の軸部23を四角柱形状とする等、これらの具体形状についても適宜に変更可能である。
(3)上記実施の形態では、蓄電素子として、非水電解液二次電池RBを例示して説明しているが、キャパシタ等の各種の蓄電素子に本発明を適用できる。
(4)上記実施の形態では、注液孔21を、装置筐体BCの上方側の側面をなす蓋部2に形成する場合を例示しているが、他の側面、すなわち、4面の縦壁面や底面に形成しても良く、その場合にも本発明を適用できる。
(2) In the above embodiment, the case where the liquid injection hole 21 is formed as a through-hole having a circular cross section and the shape of the shaft portion 23 of the sealing plug 22 is made to be a columnar shape in correspondence therewith is illustrated. These specific shapes can also be changed as appropriate, for example, the liquid injection hole 21 is a through hole having a rectangular cross section, and the shaft portion 23 of the sealing plug 22 is a quadrangular prism.
(3) In the above embodiment, the non-aqueous electrolyte secondary battery RB is described as an example of the power storage element. However, the present invention can be applied to various power storage elements such as capacitors.
(4) In the above embodiment, the case where the liquid injection hole 21 is formed in the lid portion 2 forming the side surface on the upper side of the apparatus housing BC is exemplified. You may form in a wall surface or a bottom face, and the present invention is applicable also in that case.

21 注液孔
22 封止栓
23 軸部
24 鍔部
BC 装置筐体
RB 蓄電装置
21 Injection hole 22 Sealing plug 23 Shaft part 24 Hook part BC device housing RB Power storage device

Claims (2)

軸部と前記軸部から前記軸部の軸芯と交差する方向に延出する鍔部とを備えた封止栓を、装置筐体の側面に形成された注液孔に、前記軸部が前記注液孔に嵌入する状態で装着し、A sealing plug having a shaft portion and a flange portion extending from the shaft portion in a direction intersecting the axis of the shaft portion is formed in a liquid injection hole formed on a side surface of the apparatus housing. Installed in a state of fitting into the liquid injection hole,
前記鍔部における延出側の端部を前記装置筐体と溶接する蓄電装置の製造方法であって、  A method of manufacturing a power storage device in which an end portion on the extending side of the flange portion is welded to the device housing,
前記封止栓の前記鍔部は、前記軸部の先端側の面において、前記延出側の端部が前記軸部側の箇所よりも前記軸部の先端側に位置するように構成され、  The flange portion of the sealing plug is configured such that, on the tip side surface of the shaft portion, the end portion on the extension side is located closer to the tip side of the shaft portion than the portion on the shaft portion side,
前記封止栓の前記注液孔への嵌入操作において、前記延出側の端部と前記装置筐体とが接触する状態を維持しながら、前記軸部の先端側から基端側に向かう方向で作用する押圧力によって、前記延出側の端部が前記軸部の先端側から基端側に向かう方向に変位する状態で前記鍔部を変形させ、  In the operation of fitting the sealing plug into the liquid injection hole, the direction from the distal end side to the proximal end side of the shaft portion is maintained while maintaining the state in which the end portion on the extension side and the device housing are in contact with each other. With the pressing force acting at, the end portion on the extending side is deformed in a state of being displaced in a direction from the distal end side to the proximal end side of the shaft portion,
前記延出側の端部と前記装置筐体とが接触している状態で、前記延出側の端部と前記装置筐体とを溶接する蓄電装置の製造方法。  A method of manufacturing a power storage device, wherein the extension-side end portion and the device casing are welded in a state where the extension-side end portion and the device casing are in contact with each other.
装置筐体の側面に注液孔が形成され、前記注液孔が封止栓にて封止され、A liquid injection hole is formed on the side surface of the apparatus housing, and the liquid injection hole is sealed with a sealing plug,
前記封止栓は、前記注液孔に嵌入する軸部と、前記軸部から前記軸部の軸芯と交差する方向に延出する鍔部とを備えて構成され、  The sealing plug is configured to include a shaft portion that fits into the liquid injection hole, and a flange portion that extends from the shaft portion in a direction intersecting the axis of the shaft portion,
前記鍔部における延出側の端部が前記装置筐体に溶接されている蓄電装置であって、  An end of the extending side of the flange is a power storage device welded to the device housing,
前記封止栓の前記鍔部は、前記軸部の先端側の面において、前記延出側の端部が前記軸部側の箇所よりも前記軸部の先端側に位置し、且つ、前記封止栓の前記注液孔への嵌入操作に伴って、前記延出側の端部と前記装置筐体とが接触する状態を維持しながら、前記軸部の先端側から基端側に向かう方向で作用する押圧力によって、前記延出側の端部が前記軸部の先端側から基端側に向かう方向に変位する状態で変形するように構成され、  The flange portion of the sealing plug has an end portion on the extending side located on a distal end side of the shaft portion with respect to a portion on the shaft portion side on a surface on a distal end side of the shaft portion, and the sealing portion. A direction from the distal end side to the proximal end side of the shaft portion while maintaining a state in which the end portion on the extension side and the device housing are in contact with the operation of fitting the stopper into the liquid injection hole The extending side end portion is deformed in a state of being displaced in a direction from the distal end side to the proximal end side of the shaft portion by the pressing force acting at
前記延出側の端部と前記装置筐体とが接触している状態で、前記延出側の端部と前記装置筐体とが溶接されている蓄電装置。  A power storage device in which the extension-side end and the device casing are welded in a state where the extension-side end and the device casing are in contact with each other.
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