JP2003132876A - Sealed battery and liquid pouring hole sealing method the battery - Google Patents
Sealed battery and liquid pouring hole sealing method the batteryInfo
- Publication number
- JP2003132876A JP2003132876A JP2001325798A JP2001325798A JP2003132876A JP 2003132876 A JP2003132876 A JP 2003132876A JP 2001325798 A JP2001325798 A JP 2001325798A JP 2001325798 A JP2001325798 A JP 2001325798A JP 2003132876 A JP2003132876 A JP 2003132876A
- Authority
- JP
- Japan
- Prior art keywords
- sealing
- rivet
- injection hole
- battery
- liquid injection
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
Description
【０００１】[0001]
【発明の属する分野】本発明は、電解液を注入するため
の注液孔の封止方法を改良した密閉型電池および封止方
法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealed battery and a sealing method in which a method for sealing a liquid injection hole for injecting an electrolytic solution is improved.
【０００２】[0002]
【従来の技術】近年、通信機，ＡＶ機器，パソコンのコ
ードレス化・ポータブル化に伴いその駆動用電源である
電池に対して小型・軽量・高エネルギー密度化の要望が
強まっている。特にリチウム二次電池は高エネルギー密
度を有する電池であり、その潜在的市場規模も大きい。
また形状としては機器の薄型化あるいは機器のスペース
の有効利用の観点からも角形電池の要望が高まってお
り、特に通信機においては、本体の軽量化にともない電
池に対しても小型、軽量が強く要望されている。2. Description of the Related Art In recent years, along with cordless and portable communication devices, AV devices, and personal computers, there has been an increasing demand for batteries, which are power sources for driving them, to be compact, lightweight, and have high energy density. In particular, the lithium secondary battery is a battery having a high energy density, and its potential market scale is large.
In terms of shape, there is an increasing demand for prismatic batteries from the perspective of making devices thinner and making effective use of device space, and especially in communication equipment, as the main body becomes lighter, smaller and lighter batteries are strongly required. Is requested.
【０００３】この角形電池の注液孔の封止方法として
は、特開平１１−２５９３６号公報に開示されているよ
うに、電池ケースの開口部を封口板で封口した後、電池
ケースあるいは封口板に設けられた注液孔から、ノズル
で電解液を注入した後、注液孔に封止栓を挿入し、その
外縁部をレーザー溶接で封止する方法が知られている。As a method of sealing the liquid injection hole of this prismatic battery, as disclosed in Japanese Patent Laid-Open No. 11-25936, after the opening of the battery case is sealed with a sealing plate, the battery case or the sealing plate is closed. There is known a method in which an electrolytic solution is injected from a liquid injection hole provided in a nozzle, a sealing plug is inserted into the liquid injection hole, and the outer edge portion thereof is sealed by laser welding.
【０００４】[0004]
【発明が解決しようとする課題】ところが上記のように
電解液を注入した後、電池ケース内部から、電解液が注
液孔の側壁を這い上がって溶接面に付着し、封止栓をレ
ーザー溶接する際に付着している電解液がスパッタとな
って飛散し、それが溶接不良の原因となり、この溶接不
良によって封止栓と注液孔との間から電解液漏れを起こ
し、その電池を駆動源とする電気機器やその周辺機器に
悪影響を与えるという問題があった。However, after injecting the electrolytic solution as described above, the electrolytic solution crawls up the side wall of the injection hole from the inside of the battery case and adheres to the welding surface, and the sealing plug is laser-welded. The electrolytic solution that adheres to the battery during operation is spattered and scattered, which causes welding failure.This welding failure causes electrolyte leakage between the sealing plug and the injection hole, driving the battery. There was a problem that it adversely affects the electric equipment used as the source and its peripheral equipment.
【０００５】この問題の解決方法として、注液孔の側壁
を電解液が這い上がってこないうちに封止栓のレーザー
溶接を行うか、溶接面を不織布等で清掃するといったこ
とが行われているものの、レーザー溶接不良による注液
孔の封止不良を完全に防止することは困難であった。As a method for solving this problem, laser welding of the sealing plug is performed before the electrolytic solution has creeped up the side wall of the injection hole, or the welding surface is cleaned with a non-woven fabric or the like. However, it was difficult to completely prevent the sealing failure of the liquid injection hole due to the laser welding failure.
【０００６】また、レーザー溶接は作業性が悪く、封止
栓の加工精度に費やす加工費がかかるため、設備投資が
かかるという問題もあった。Further, since the laser welding has poor workability and requires a high processing cost for processing the sealing plug, there is a problem in that equipment investment is required.
【０００７】さらに、注液孔の封止に用いられる封止栓
は、例えば図７の１１Ａに示すように直径が１〜２ｍｍ
程度の注液孔のサイズに合わせてかなり小さく形成され
ているため、取扱いが非常に不便であり、封止栓を注液
孔に挿入する際に供給不良が発生しやすいといった生産
上の問題も発生していた。Further, the sealing plug used for sealing the liquid injection hole has a diameter of 1 to 2 mm as shown in 11A of FIG. 7, for example.
Since it is formed to be quite small according to the size of the injection hole, it is very inconvenient to handle, and there is also a production problem that a supply failure easily occurs when inserting the sealing plug into the injection hole. Had occurred.
【０００８】そこで本発明はこのような問題を解決し、
注液孔周縁部への電解液の付着状態に関わらず、容易か
つ確実に注液孔を封止して封止不良を無くし、生産性の
向上とコストダウンそして製品の高性能化を図ることの
できる密閉型電池および注液孔の封止方法を提供するこ
とを目的とする。Therefore, the present invention solves such a problem,
Regardless of how electrolyte is attached to the periphery of the injection hole, the injection hole can be easily and reliably sealed to eliminate sealing defects, improve productivity, reduce costs, and improve product performance. It is an object of the present invention to provide a sealed battery and a method for sealing a liquid injection hole that can be performed.
【０００９】[0009]
【課題を解決するための手段】上記課題を解決するため
の本発明による密閉型電池は、発電要素が収納された電
池ケースと、電池ケースの開口部を封口する封口板と、
前記電池ケースまたは封口板のいずれか一方に設けら
れ、電池ケース内に電解液を注入する注液孔と、この注
液孔を封止する封止リベットからなる密閉型電池であっ
て、前記封止リベットが、注液孔より長く形成された胴
部とその胴部基端に一体形成されるフランジ部とからな
り、注液孔より電池内方側に突出する胴部先端を変形さ
せることによって、その注液孔周縁部にかしめ圧着して
注液孔が封止されていることを特徴としている。[Means for Solving the Problems] A sealed battery according to the present invention for solving the above problems includes a battery case accommodating a power generating element, a sealing plate for sealing an opening of the battery case,
What is claimed is: 1. A sealed battery, comprising a liquid injection hole provided on either one of the battery case and a sealing plate, for injecting an electrolytic solution into the battery case, and a sealing rivet for sealing the liquid injection hole. The stop rivet is composed of a body longer than the injection hole and a flange integrally formed at the base end of the body, and by deforming the tip of the body protruding inward of the battery from the injection hole. The liquid injection hole is sealed by caulking and crimping the periphery of the liquid injection hole.
【００１０】この密閉型電池によれば、胴部が注液孔よ
り長く形成されている封止リベットが注液孔に挿入され
た際、注液孔より電池内方側に突出する胴部先端を変形
させることによって、封口板または電池ケースの注液孔
周縁部にかしめ圧着されて注液孔が封止される構造とな
るので、注液孔周縁部への電解液の付着状態に関わらず
容易かつ確実に注液孔を封止することができるので、封
止不良がなく、封止不良に伴う電解液漏れを引き起こす
ことがない。またレーザー溶接を用いないので、設備投
資にかかるコストも低減することができる。According to this hermetically sealed battery, when the sealing rivet having the body longer than the filling hole is inserted into the filling hole, the tip of the body protruding from the filling hole to the inner side of the battery. By deforming, the structure is such that the injection hole is sealed by caulking and crimping on the periphery of the injection hole of the sealing plate or battery case, regardless of the state of attachment of the electrolyte solution to the periphery of the injection hole. Since the liquid injection hole can be easily and surely sealed, there is no sealing failure and no electrolyte leakage due to the sealing failure occurs. Further, since laser welding is not used, the cost required for capital investment can be reduced.
【００１１】上記発明において、封止リベットが、注液
孔より長く形成されたリベット本体およびその基端に一
体形成されるフランジ部からなる中空リベットと、易破
断部より基端側の軸部を前記フランジ部より電池外方に
延出させると共に、易破断部より先端側の軸部を前記リ
ベット本体の中空部に嵌挿させる軸部、およびその先端
に中空部の寸法より大きな寸法の頭部からなるマンドレ
ルとから構成され、前記軸部は、注液孔の封止時には易
破断部より破断されて先端側の軸部を中空部に残し、基
端側の軸部が切り離されるものとすれば、封止リベット
の胴部先端の変形による注液孔周縁部へのかしめ圧着
を、注液孔より電池内方側に突出するリベット本体の先
端が、マンドレルの基端側の軸部が引き上げられた際
に、その頭部の外面と封口板の周縁部との間に挟持させ
ることで実現できる。そして、易破断部を境にして基端
側の軸部が切り離されることで、先端側の軸部がリベッ
ト本体の中空部に嵌挿された状態で、注液孔が封止され
る。また、このような比較的長いマンドレルを用いるこ
とで、封止リベットを取扱い易いものとして部品供給不
良を低減することができる。In the above invention, the sealing rivet includes a hollow rivet including a rivet body formed longer than the liquid injection hole and a flange portion integrally formed at the base end thereof, and a shaft portion closer to the base end side than the easily breakable portion. A shaft part extending from the flange part to the outside of the battery and having a shaft part on the tip side of the easily breakable part fitted into the hollow part of the rivet body, and a head part having a size larger than the size of the hollow part at its tip. The mandrel is composed of a mandrel, and the shaft part is ruptured from the easily rupturable part at the time of sealing the injection hole, leaving the shaft part on the tip side in the hollow part, and the shaft part on the base end side is separated. For example, when caulking and crimping to the periphery of the liquid injection hole due to deformation of the tip of the body of the sealing rivet, the tip of the rivet body protruding inward from the liquid injection hole raises the shaft of the mandrel base When it is struck, It can be realized by clamping between the periphery of the mouth plate. Then, by disconnecting the shaft portion on the base end side with the easily breakable portion as a boundary, the liquid injection hole is sealed in a state where the shaft portion on the tip end side is fitted and inserted in the hollow portion of the rivet body. Further, by using such a relatively long mandrel, it is possible to make the sealing rivet easy to handle and reduce defective parts supply.
【００１２】上記各発明において、封止リベットの外周
壁と注液孔の側周壁との間の全面またはその一部に、樹
脂を介在させることにより、注液孔の密閉性をさらに向
上させることができる。In each of the above inventions, the resin is interposed on the entire surface or a part thereof between the outer peripheral wall of the sealing rivet and the side peripheral wall of the liquid injection hole to further improve the sealing property of the liquid injection hole. You can
【００１３】また中空リベットとマンドレルから構成さ
れる封止リベットにおいて、リベット本体の内周壁とマ
ンドレル側周壁との間の全面またはその一部に、樹脂を
介在させることにより、マンドレルの落下に対する信頼
性をさらに確保できる。In addition, in a sealing rivet composed of a hollow rivet and a mandrel, by interposing resin on the entire surface or a part thereof between the inner peripheral wall of the rivet body and the mandrel side peripheral wall, reliability of the mandrel against falling is improved. Can be further secured.
【００１４】前記樹脂は、フッ素樹脂、ポリエチレン樹
脂、ポリプロピレン樹脂製のシートまたは、上記樹脂を
溶剤にディスパージョン化したり、ブロンアスファルト
を有機溶剤に溶解させたものを用いるのが好適である。As the resin, it is preferable to use a sheet made of a fluororesin, a polyethylene resin, a polypropylene resin, a dispersion of the above resin in a solvent, or a solution of blown asphalt in an organic solvent.
【００１５】また、本発明の注液孔の封止方法は、前記
マンドレルと前記中空リベットからなる封止リベットを
用い、電池ケースの開口部を封口板で封口し、電池ケー
スまたは封口板のいずれか一方に設けられた注液孔に電
解液を注入した後、前記注液孔に、中空リベットのフラ
ンジ部が電池外方側に配されるようにしてそのリベット
本体を挿入した後、フランジ部を押圧しつつマンドレル
を電池外方に引き上げることにより、注液孔より電池内
方側に突出するリベット本体先端をマンドレルの頭部の
外面と注液孔周縁部との間に挟持した状態で、易破断部
を破断し、先端側の軸部をリベット本体の中空部に残し
て基端側の軸部を切り離し、注液孔を封止することを特
徴としている。Further, the method for sealing a liquid injection hole of the present invention uses a sealing rivet composed of the mandrel and the hollow rivet, and seals the opening of the battery case with a sealing plate, and either the battery case or the sealing plate is sealed. After injecting the electrolytic solution into the injection hole provided on one side or the other, after inserting the rivet body into the injection hole so that the flange portion of the hollow rivet is arranged on the outer side of the battery, the flange portion By pulling the mandrel outside the battery while pressing, the tip of the rivet body protruding from the liquid injection hole to the battery inner side is sandwiched between the outer surface of the head of the mandrel and the liquid injection hole peripheral portion, It is characterized in that the easily breakable portion is broken and the shaft portion on the tip end side is left in the hollow portion of the rivet body to separate the shaft portion on the base end side to seal the liquid injection hole.
【００１６】この注液孔の封止方法によれば、注液孔よ
り電池内方側に突出するリベット本体先端を変形させる
ことによって、注液孔周縁部にかしめ圧着して注液孔を
封止できるので、注液孔周縁部への電解液の付着状態に
関わらず容易かつ確実に注液孔を封止することができる
ので封止不良が無く、封止不良に伴う電解液漏れを引き
起こすことがない。According to this method for sealing the liquid injection hole, the tip of the rivet body projecting inward from the liquid injection hole is deformed, so that the liquid injection hole is sealed by caulking and crimping the periphery of the liquid injection hole. Since it can be stopped, the injection hole can be easily and reliably sealed regardless of the state of attachment of the electrolyte solution to the periphery of the injection hole, so there is no sealing failure and electrolyte leakage due to sealing failure occurs. Never.
【００１７】また、レーザー溶接を用いないので、設備
投資にかかるコストも低減することができる。さらに、
比較的長いマンドレルを用いることで、封止リベットを
取扱い易いものとして部品供給不良を低減することがで
きる。Further, since laser welding is not used, the cost required for equipment investment can be reduced. further,
By using a relatively long mandrel, it is possible to make the sealing rivet easy to handle and reduce defective parts supply.
【００１８】[0018]
【発明の実施の形態】以下、本発明の実施形態につい
て、図面を参照しながら具体的に説明する。図１は、本
発明の実施形態に係る密閉型電池の封口板１周縁部の概
略構成を示している。BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 shows a schematic configuration of a peripheral portion of a sealing plate 1 of a sealed battery according to an embodiment of the present invention.
【００１９】電池ケース２は上端が開口している有底の
角筒状であり、その材質はアルミニウム合金製またはニ
ッケルメッキを施した鉄製からなる。アルミニウム合金
製の場合、耐圧強度の観点からマンガン、銅等の金属を
微量含有するアルミニウム合金が好ましく、合金Ｎｏ．
３０００系のアルミニウム合金が最適であり、正極端子
を兼ねている。The battery case 2 is in the shape of a bottomed rectangular tube having an open upper end, and is made of aluminum alloy or nickel-plated iron. In the case of an aluminum alloy, an aluminum alloy containing a trace amount of a metal such as manganese or copper is preferable from the viewpoint of pressure resistance, and alloy No.
The 3000 series aluminum alloy is most suitable and also serves as the positive electrode terminal.
【００２０】電池ケース２内には、正極板と負極板とを
セパレータを介して非真円形の渦巻形状に巻回した発電
要素３が収納されている。In the battery case 2, there is housed a power generating element 3 in which a positive electrode plate and a negative electrode plate are wound in a non-round circular spiral shape with a separator interposed therebetween.
【００２１】正極板は、アルミニウム製の箔やラス加工
やエッチング処理された箔からなる集電体の片側または
両面に正極活物質と結着剤、必要に応じて導電剤、可塑
剤を溶媒に混練分散させたペーストを塗布、乾燥、圧延
して作製することができる。正極活物質としては、例え
ば、リチウムイオンをゲストとして受け入れ得るリチウ
ム含有遷移金属化合物が使用される。例えば、コバル
ト、マンガン、ニッケル、クロム、鉄およびバナジウム
から選ばれる少なくとも一種類の金属とリチウムとの複
合金属酸化物、ＬｉＣｏＯ2 、ＬｉＭｎＯ2 、ＬｉＮｉ
Ｏ2 、ＬｉＣｏxＮｉ(1-x) Ｏ2 （０＜ｘ＜１）、Ｌｉ
ＣｒＯ2 、αＬｉＦｅＯ2 、ＬｉＶＯ2 等が好ましい。The positive electrode plate comprises a positive electrode active material and a binder on one or both sides of a current collector made of an aluminum foil or a foil subjected to lath processing or etching treatment, and if necessary, a conductive agent and a plasticizer as a solvent. The paste can be prepared by coating, drying and rolling the kneaded and dispersed paste. As the positive electrode active material, for example, a lithium-containing transition metal compound that can accept lithium ions as a guest is used. For example, a composite metal oxide of at least one metal selected from cobalt, manganese, nickel, chromium, iron and vanadium and lithium, LiCoO 2 , LiMnO 2 , LiNi.
O 2 , LiCo x Ni (1-x) O 2 (0 <x <1), Li
CrO 2 , αLiFeO 2 , LiVO 2 and the like are preferable.
【００２２】負極板は、銅製の箔やラス加工やエッチン
グされた箔からなる集電体の片側または両面に負極活物
質と結着剤、必要に応じて導電剤、可塑剤を溶媒に混練
分散させたペーストを塗布、乾燥、圧延して作製するこ
とができる。負極活物質としては、例えば、リチウムイ
オンを吸蔵、脱離し得る黒鉛型結晶構造を有するグラフ
ァイトを含む材料、例えば天然黒鉛や人造黒鉛が使用さ
れる。特に、格子面（００２）の面間隔（ｄ002 ）が
３．３５０〜３．４００Åである黒鉛型結晶構造を有す
る炭素材料を使用することが好ましい。The negative electrode plate is made of a copper foil, a lathed or etched foil, and a negative electrode active material and a binder, and if necessary, a conductive agent and a plasticizer are kneaded and dispersed in a solvent on one or both sides of the current collector. The paste thus prepared can be applied, dried, and rolled to prepare. As the negative electrode active material, for example, a material containing graphite having a graphite-type crystal structure capable of inserting and extracting lithium ions, such as natural graphite or artificial graphite is used. In particular, it is preferable to use a carbon material having a graphite type crystal structure in which the lattice spacing (d 002 ) of the lattice plane (002) is 3.350 to 3.400 Å.
【００２３】セパレータとしては、ポリエチレン樹脂、
ポリプロピレン樹脂などの微多孔性ポリオレフィン系樹
脂が好ましい。As the separator, polyethylene resin,
A microporous polyolefin resin such as polypropylene resin is preferred.
【００２４】次に、正極板と負極板をセパレータを介し
て非真円形の渦巻形状に巻回した発電要素をプレスして
得られる長円状の発電要素３を、電池ケース２に挿入す
る。このとき発電要素３を常温だけでなく、４０℃から
発電要素３中の結着剤の軟化点以下の温度に加温した状
態で１．０ＭＰａ〜７．０ＭＰａの圧力にてプレスする
ことが好ましい。Next, an oval power generating element 3 obtained by pressing a power generating element in which a positive electrode plate and a negative electrode plate are wound in a non-circular spiral shape via a separator is inserted into a battery case 2. At this time, it is preferable to press the power generating element 3 not only at room temperature but also at a temperature of 40 ° C. to a temperature equal to or lower than the softening point of the binder in the power generating element 3 at a pressure of 1.0 MPa to 7.0 MPa. .
【００２５】電池ケース２の開口部を封口密閉する封口
板１には電池ケース２内に非水電解液（図示せず）を注
入する注液孔４が、配設されている。この注液孔４の形
状は特に限定されるものではないが、円形や楕円形のも
のが好ましく、その径は１〜２ｍｍ程度のものが好まし
い。The sealing plate 1 for sealing the opening of the battery case 2 is provided with a liquid injection hole 4 for injecting a non-aqueous electrolyte (not shown) into the battery case 2. The shape of the liquid injection hole 4 is not particularly limited, but a circular or elliptical shape is preferable, and a diameter thereof is preferably about 1 to 2 mm.
【００２６】封口板１にはその中央部において、外部接
続用負極端子６が、上部絶縁ガスケット５、下部絶縁ガ
スケット７、内部端子板８を介して貫通して取付けら
れ、その外部接続用負極端子６の軸部下端でかしめ圧着
されることにより、封口板１に固定されている。封口板
１に配設された注液孔４には、注液孔４を封止する封止
リベット１１が挿入されている。At the central portion of the sealing plate 1, an external connection negative electrode terminal 6 is attached through the upper insulating gasket 5, the lower insulating gasket 7 and the internal terminal plate 8 so as to penetrate therethrough. It is fixed to the sealing plate 1 by crimping and crimping at the lower end of the shaft portion of 6. A sealing rivet 11 for sealing the liquid injection hole 4 is inserted into the liquid injection hole 4 provided in the sealing plate 1.
【００２７】第１実施形態における封止リベット１１は
図２に示すように、中空リベット９とその中空部を貫通
するマンドレル１０とから構成される。中空リベット９
は、円筒状に形成されたリベット本体（封止リベット１
１全体でいえばその胴部に当たる。）９ａとその基端に
一体形成されるフランジ部９ｂからなる。マンドレル１
０は、易破断部１０ｂを境にして、リベット本体９ａの
中空部に嵌挿される先端軸部１０ｃと、フランジ部９ｂ
より電池外方側に延出して、封止リベット１１の注液孔
４への封止完了時には切り離される基端軸部１０ａとに
分かれる軸部と、先端軸部１０ｃに一体形成されて中空
部の寸法より大きな寸法に形成された頭部１０ｄとから
なる。マンドレル１０は、鉄やアルミニウム合金といっ
た金属で、中空リベット９は、ポリプロピレン樹脂、ポ
リフェニレンサルファイト樹脂、フッ素樹脂などを用い
て成形するのが好適である。As shown in FIG. 2, the sealing rivet 11 in the first embodiment comprises a hollow rivet 9 and a mandrel 10 penetrating the hollow portion. Hollow rivet 9
Is a cylindrical rivet body (sealing rivet 1
The whole 1 hits the body. ) 9a and a flange portion 9b integrally formed at the base end thereof. Mandrel 1
0 is the tip shaft portion 10c fitted into the hollow portion of the rivet body 9a with the easily breakable portion 10b as a boundary, and the flange portion 9b.
A hollow portion formed integrally with the tip shaft portion 10c and a shaft portion that extends further outward of the battery and is divided into a base end shaft portion 10a that is cut off when the sealing of the sealing rivet 11 into the liquid injection hole 4 is completed. The head 10d is formed to have a size larger than the size. The mandrel 10 is preferably made of metal such as iron or aluminum alloy, and the hollow rivet 9 is preferably made of polypropylene resin, polyphenylene sulfite resin, fluororesin or the like.
【００２８】次に、上記封止リベット１１を用いた注液
孔の封止方法について図３を用いて説明する。Next, a method of sealing the injection hole using the sealing rivet 11 will be described with reference to FIG.
【００２９】まず、電池ケース２の開口部を封口板１で
封口し、注液孔４より電池ケース２内部に電解液を注入
した後、図３（ａ）と（ｂ）に示すように、封口板１に
設けられた注液孔４に、マンドレル１０の頭部１０ｄを
貫通させつつ中空リベット９のリベット本体９ａを嵌め
合わせ、注液孔４の周縁部に、中空リベット９のフラン
ジ部９ｂが当接するまで挿入する。その後（ｃ）に示す
ように、専用かしめ治具１６を用いてマンドレル１０の
基端軸部１０ａをチャッキングした後、（ｄ）に示すよ
うに、フランジ部９ｂを押さえながらマンドレル１０を
引き上げる。このとき、マンドレル１０の頭部１０ｄ
は、（ｅ）に示すように中空リベット９のリベット本体
９ａの先端を変形させながらその中空部へ食い込んでい
く。この状態でマンドレル１０をさらに引き上げると、
マンドレル１０の頭部１０ｄは、さらに食い込み、リベ
ット本体９ａの先端が、頭部１０ｄの外面と電池内方側
の注液孔４の周縁部との間に挟持される。つまり封止リ
ベット１１全体で考えれば、その胴部先端が変形するこ
とによって、注液孔４の周縁部にかしめ圧着し、注液孔
４を封止することができる。そして（ｆ）に示すよう
に、マンドレル１０の易破断部１０ｂが破断し、基端軸
部１０ａのみが切り離されて先端軸部１０ｃが中空リベ
ット９の中空部に嵌挿されて封止完了となる。First, the opening of the battery case 2 is sealed with the sealing plate 1, the electrolytic solution is injected into the battery case 2 through the liquid injection hole 4, and then, as shown in FIGS. 3 (a) and 3 (b). The rivet body 9a of the hollow rivet 9 is fitted into the liquid injection hole 4 provided in the sealing plate 1 while penetrating the head 10d of the mandrel 10, and the flange portion 9b of the hollow rivet 9 is fitted to the peripheral edge of the liquid injection hole 4. Insert until touch. Thereafter, as shown in (c), the proximal end shaft portion 10a of the mandrel 10 is chucked by using the dedicated caulking jig 16, and then the mandrel 10 is pulled up while pressing the flange portion 9b as shown in (d). At this time, the head 10d of the mandrel 10
As shown in (e), the tip of the rivet body 9a of the hollow rivet 9 is deformed and bites into the hollow portion. If the mandrel 10 is pulled up further in this state,
The head 10d of the mandrel 10 further bites, and the tip of the rivet body 9a is sandwiched between the outer surface of the head 10d and the peripheral edge of the liquid injection hole 4 on the battery inner side. In other words, considering the entire sealing rivet 11, the tip of the body portion is deformed, so that the liquid injection hole 4 can be sealed by caulking and crimping to the peripheral edge of the liquid injection hole 4. Then, as shown in (f), the easily breakable portion 10b of the mandrel 10 is broken, only the proximal end shaft portion 10a is cut off, and the distal end shaft portion 10c is inserted into the hollow portion of the hollow rivet 9 to complete the sealing. Become.
【００３０】この状態で、封口板１は注液孔４の周縁部
において、電池外方側ではフランジ部９ｂとの間、また
電池内方側ではリベット本体９ａの先端（封止リベット
１１の胴部先端）との間でそれぞれ密着状態となり、注
液孔４が封止される。In this state, the sealing plate 1 is in the peripheral portion of the liquid injection hole 4, between the flange portion 9b on the outer side of the battery, and the tip of the rivet body 9a (the body of the sealing rivet 11 on the inner side of the battery). And the liquid injection hole 4 is sealed.
【００３１】図４は第２実施形態における封止リベット
１１ないし封止機構を示している。第２実施形態におい
て、例えば、ポリプロピレン樹脂、ポリフェニレンサル
ファイト樹脂、フッ素樹脂などの樹脂製で、有底円筒状
の凹部１２ａとその口部外周に設けられた鍔部１２ｂか
らなる凹型ガスケット１２を、中空リベット９のリベッ
ト本体９ａないしマンドレル１０の頭部１０ｄをその凹
部１２ａで包み込むように装着している。この封止リベ
ット１１と凹型ガスケット１２を用いて、図３に示した
第１実施形態と同様の封止方法にて注液孔４に挿入して
封止する際に、注液孔４側周壁と封止リベット１１との
間に凹型ガスケット１２が介在し、頭部１０ｄの下方に
凹部１２ａが配されていることで、マンドレル１０の落
下に対する信頼性がより向上すると共に、注液孔４の密
閉性をより向上させることができる。FIG. 4 shows the sealing rivet 11 or the sealing mechanism in the second embodiment. In the second embodiment, for example, a concave gasket 12 made of a resin such as polypropylene resin, polyphenylene sulfite resin, or fluororesin and having a bottomed cylindrical concave portion 12a and a flange portion 12b provided on the outer periphery of the mouth thereof is provided. The rivet body 9a of the hollow rivet 9 or the head 10d of the mandrel 10 is mounted so as to be wrapped in the recess 12a. When the sealing rivet 11 and the concave gasket 12 are used to insert and seal in the liquid injection hole 4 by the same sealing method as in the first embodiment shown in FIG. 3, the peripheral wall on the liquid injection hole 4 side. Since the concave gasket 12 is interposed between the sealing rivet 11 and the sealing rivet 11 and the concave portion 12a is arranged below the head portion 10d, the reliability of the mandrel 10 against falling is further improved, and the injection hole 4 The hermeticity can be further improved.
【００３２】図５は第３実施形態における封止リベット
１１ないし封止機構を示している。第３実施形態におい
ては、図４に示した凹部ガスケット１２の代わりに、同
じく樹脂製で円筒部１３ａとその口部外周に設けられた
鍔部１３ｂからなる円筒型ガスケット１３を、封止リベ
ット１１のリベット本体９ａを包むように装着し、ある
いは樹脂シート１４を、リベット本体９ａ内周壁とマン
ドレル１０の軸部１０ａ、１０ｃとの間に挿入してい
る。円筒型ガスケット１３または樹脂シート１４はいず
れか一方の装着でもよいし、両方同時の装着でもよい。
この封止リベット１１と円筒型ガスケット１３ないし樹
脂シート１４を用いて、第１実施形態と同様の封止方法
にて注液孔４に挿入し封止した際に、注液孔４側周壁と
封止リベット１１との間に円筒型ガスケット１３が介在
していることで、注液孔４の密閉性をより向上させるこ
とができると共に、リベット本体９ａとマンドレル１０
との間に樹脂シート１４が介在していることでマンドレ
ル１０の落下に対する信頼性をより向上させることがで
きる。FIG. 5 shows the sealing rivet 11 or the sealing mechanism in the third embodiment. In the third embodiment, instead of the recessed gasket 12 shown in FIG. 4, a cylindrical gasket 13 made of a resin and having a cylindrical portion 13a and a flange portion 13b provided on the outer circumference of the same is used as a sealing rivet 11. The rivet body 9a is mounted so as to wrap it, or the resin sheet 14 is inserted between the inner peripheral wall of the rivet body 9a and the shaft portions 10a and 10c of the mandrel 10. Either one of the cylindrical gasket 13 and the resin sheet 14 may be mounted, or both of them may be mounted simultaneously.
When the sealing rivet 11 and the cylindrical gasket 13 or the resin sheet 14 are used to insert and seal in the liquid injection hole 4 by the same sealing method as in the first embodiment, the sealing wall and the peripheral wall on the liquid injection hole 4 side are formed. Since the cylindrical gasket 13 is interposed between the sealing rivet 11 and the sealing rivet 11, the airtightness of the liquid injection hole 4 can be further improved, and the rivet body 9a and the mandrel 10 can be improved.
Since the resin sheet 14 is interposed between and, the reliability with respect to the fall of the mandrel 10 can be further improved.
【００３３】図６は第４実施形態における封止リベット
１１ないし封止機構を示している。第４実施形態におい
ては、第２実施形態で用いた凹型ガスケット１２や第３
実施形態で用いた円筒型ガスケット１３、樹脂シート１
４の代わりに、例えばブロンアスファルトといった封止
剤１５を同部分に用いて構成したものであり、第１実施
形態と同様の封止方法にて注液孔４に挿入し封止した際
に、注液孔４側周壁と封止リベット１１との間に封止剤
１５が介在していることで、注液孔４の密閉性をより向
上させることができると共に、リベット本体９ａとマン
ドレル１０との間にも封止剤１５が介在していること
で、マンドレル１０の落下に対する信頼性をより向上さ
せることができる。FIG. 6 shows a sealing rivet 11 or a sealing mechanism in the fourth embodiment. In the fourth embodiment, the concave gasket 12 and the third gasket used in the second embodiment are used.
Cylindrical gasket 13 and resin sheet 1 used in the embodiment
In place of 4, the sealant 15 such as blown asphalt is used in the same portion, and when the sealant 15 is inserted into the injection hole 4 and sealed by the same sealing method as in the first embodiment, Since the sealant 15 is interposed between the peripheral wall on the liquid injection hole 4 side and the sealing rivet 11, the hermeticity of the liquid injection hole 4 can be further improved, and the rivet body 9a and the mandrel 10 can be connected to each other. The reliability of the mandrel 10 with respect to the fall can be further improved by interposing the sealant 15 also between them.
【００３４】[0034]
【実施例】本発明を実施例および比較例を用いて、詳細
に説明するが、これらは本発明を何ら限定するものでは
ない。EXAMPLES The present invention will be described in detail with reference to Examples and Comparative Examples, but these do not limit the present invention in any way.
【００３５】（実施例１）ＬｉＣｏＯ2 を正極活物質と
する正極板と炭素材料を負極活物質とする負極板とを厚
さ２５μｍの微多孔性ポリエチレン樹脂からなるセパレ
ータを介して扁平状に巻回した発電要素を、長辺面から
常温で５．０ＭＰａの圧力にて１０分間プレスことによ
り長円状の発電要素３を作製した。Example 1 A positive electrode plate having LiCoO 2 as a positive electrode active material and a negative electrode plate having a carbon material as a negative electrode active material were wound in a flat shape with a separator made of microporous polyethylene resin having a thickness of 25 μm interposed therebetween. The rotated power generating element was pressed from the long side surface at room temperature under a pressure of 5.0 MPa for 10 minutes to produce an elliptical power generating element 3.
【００３６】電池ケース２として、３０００系のアルミ
ニウム合金を用いて、幅１０．０ｍｍ、長さ３４．０ｍ
ｍ、総高５０．０ｍｍで、肉厚が０．３０ｍｍの形状に
プレス成型し、上端が開口している有底の角筒状の電池
ケースを用いた。The battery case 2 is made of a 3000 series aluminum alloy and has a width of 10.0 mm and a length of 34.0 m.
m, a total height of 50.0 mm, and a wall thickness of 0.30 mm were press-molded, and a bottomed prismatic battery case with an open upper end was used.
【００３７】このようにして得られた電池ケース２に長
円状の発電要素３を挿入し、電池ケース２と厚さ１．０
ｍｍのアルミニウム合金製の封口板１とをレーザー溶接
した後、封口板１に配設された直径２．０ｍｍの注液孔
４からエチレンカーボネート（ＥＣ）とエチルメチルカ
ーボネート（ＥＭＣ）を体積比１：３で混合した混合溶
媒に、電解質である６フッ化リン酸リチウム（ＬｉＰＦ
６）を１．５Ｍの濃度で溶解させた非水電解液を注液し
た。The oval power generating element 3 is inserted into the battery case 2 thus obtained, and the thickness of the battery case 2 is 1.0
After laser welding the sealing plate 1 made of aluminum alloy of 1 mm, the volume ratio of ethylene carbonate (EC) and ethyl methyl carbonate (EMC) is 1 from the injection hole 4 having a diameter of 2.0 mm arranged in the sealing plate 1. : Lithium hexafluorophosphate (LiPF 6) that is an electrolyte in the mixed solvent
A non-aqueous electrolyte solution in which 6) was dissolved at a concentration of 1.5 M was poured.
【００３８】注液孔４を封止する封止リベット１１は、
図２に示すように、中空リベット９とその中空部を貫通
するマンドレル１０とから構成される。中空リベット９
は、ポリプロピレン樹脂製で円筒状に形成された外径
１．８ｍｍで内径が１．４ｍｍのリベット本体９ａとそ
の基端に一体形成され、外方突出長さが２．０ｍｍ、外
径が４．０ｍｍであるフランジ部９ｂから構成される。The sealing rivet 11 for sealing the liquid injection hole 4 is
As shown in FIG. 2, it comprises a hollow rivet 9 and a mandrel 10 which penetrates the hollow portion. Hollow rivet 9
Is a rivet body 9a made of polypropylene resin and formed in a cylindrical shape having an outer diameter of 1.8 mm and an inner diameter of 1.4 mm and the base end thereof are integrally formed with an outer protruding length of 2.0 mm and an outer diameter of 4 mm. It is composed of a flange portion 9b of 0.0 mm.
【００３９】マンドレル１０は、アルミニウム合金製
で、易破断部１０ｂを境にして、リベット本体９ａの中
空部に嵌挿される先端軸部１０ｃと、フランジ部９ｂよ
り電池外方側に延出して、封止リベット１１の注液孔４
への封止完了時には切り離される基端軸部１０ａとに分
かれる軸部と、先端軸部１０ｃに一体形成されて中空部
の直径より大きな１．６ｍｍに形成された頭部１０ｄと
からなり、マンドレル１０の全長は３０ｍｍに構成し
た。The mandrel 10 is made of an aluminum alloy and extends from the easily breakable portion 10b to the outer side of the battery from the tip shaft portion 10c fitted into the hollow portion of the rivet body 9a and the flange portion 9b. Injection hole 4 of sealing rivet 11
The mandrel is composed of a shaft portion that is divided into a base end shaft portion 10a that is separated when the sealing to the end is completed, and a head portion 10d that is integrally formed with the tip end shaft portion 10c and has a diameter of 1.6 mm larger than the hollow portion. The total length of 10 was 30 mm.
【００４０】次に、上記封止リベット１１を用いた注液
孔の封止方法について図３を用いて説明する。まず、図
３（ａ）と（ｂ）に示すように、封口板１に設けられた
注液孔４およびその周囲を清掃することなく、マンドレ
ル１０の頭部１０ｄを貫通させつつ中空リベット９のリ
ベット本体９ａを嵌め合わせ、注液孔４の周縁部に、中
空リベット９のフランジ部９ｂが当接するまで挿入し
た。その後（ｃ）に示すように、専用かしめ治具１６を
用いてマンドレル１０の基端軸部１０ａをチャッキング
した後、（ｄ）に示すように、フランジ部９ｂを押さえ
ながらマンドレル１０を引き上げた。このとき、マンド
レル１０の頭部１０ｄは、（ｅ）に示すように中空リベ
ット９のリベット本体９ａの先端を変形させながらその
中空部へ食い込ませた。この状態でマンドレル１０をさ
らに引き上げ、マンドレル１０の頭部１０ｄをさらに食
い込ませ、リベット本体９ａの先端が、頭部１０ｄの外
面と電池内方側の注液孔４の周縁部との間に挟持させ
た。そして（ｆ）に示すように、マンドレル１０の易破
断部１０ｂを破断させ、基端軸部１０ａのみが切り離さ
れて先端軸部１０ｃが中空リベット９の中空部に嵌挿さ
せて注液孔４の封止を完了させた。Next, a method of sealing the injection hole using the sealing rivet 11 will be described with reference to FIG. First, as shown in FIGS. 3A and 3B, the hollow rivet 9 of the hollow rivet 9 is penetrated while the head 10d of the mandrel 10 is penetrated without cleaning the liquid injection hole 4 provided in the sealing plate 1 and its surroundings. The rivet body 9a was fitted and inserted into the periphery of the liquid injection hole 4 until the flange 9b of the hollow rivet 9 abuts. Thereafter, as shown in (c), the proximal end shaft portion 10a of the mandrel 10 is chucked by using the dedicated caulking jig 16, and then the mandrel 10 is pulled up while pressing the flange portion 9b as shown in (d). . At this time, the head portion 10d of the mandrel 10 bites into the hollow portion while deforming the tip of the rivet body 9a of the hollow rivet 9 as shown in (e). In this state, the mandrel 10 is further pulled up to further bite into the head 10d of the mandrel 10, and the tip of the rivet body 9a is clamped between the outer surface of the head 10d and the peripheral portion of the liquid injection hole 4 on the inner side of the battery. Let Then, as shown in (f), the easily breakable portion 10b of the mandrel 10 is broken, only the proximal end shaft portion 10a is cut off, and the distal end shaft portion 10c is inserted into the hollow portion of the hollow rivet 9 to inject the liquid injection hole 4 Was completed.
【００４１】（実施例２）ニッケルメッキを施した鉄製
で、幅１０．０ｍｍ、長さ３４．０ｍｍ、総高５０．０
ｍｍで、肉厚が０．３０ｍｍの形状にプレス成型し、上
端が開口している有底の角筒状の電池ケース２内に、実
施例１と同様にして作製した発電要素３を挿入し、厚さ
０．８ｍｍのニッケルメッキを施した鉄製の封口板１と
をレーザー溶接した後、封口板１に配設された直径１．
０ｍｍの注液孔４から実施例１と同様の非水電解液を注
液した。(Example 2) Made of iron plated with nickel, width 10.0 mm, length 34.0 mm, total height 50.0.
The power generating element 3 manufactured in the same manner as in Example 1 was inserted into a battery case 2 having a rectangular shape with a bottom and a bottom and an opening at the upper end. After laser welding a 0.8 mm-thick nickel-plated iron sealing plate 1, the diameter of 1.
The same nonaqueous electrolytic solution as in Example 1 was injected through the 0 mm injection hole 4.
【００４２】注液孔４を封止する封止リベット１１は、
図４に示すように、中空リベット９とその中空部を貫通
するマンドレル１０とから構成される。中空リベット９
は、ポリプロピレン樹脂製で円筒状に形成された外径
０．８ｍｍで内径が０．７ｍｍのリベット本体９ａとそ
の基端に一体形成され、外方突出長さが２．０ｍｍ、外
径が４．０ｍｍであるフランジ部９ｂから構成される。The sealing rivet 11 for sealing the liquid injection hole 4 is
As shown in FIG. 4, it is composed of a hollow rivet 9 and a mandrel 10 penetrating the hollow portion. Hollow rivet 9
Is a rivet body 9a made of polypropylene resin and formed in a cylindrical shape and having an outer diameter of 0.8 mm and an inner diameter of 0.7 mm, and is integrally formed with the base end thereof, and has an outer protruding length of 2.0 mm and an outer diameter of 4 mm. It is composed of a flange portion 9b of 0.0 mm.
【００４３】マンドレル１０は、ニッケルメッキを施し
た鉄製で、易破断部１０ｂを境にして、リベット本体９
ａの中空部に嵌挿される先端軸部１０ｃと、フランジ部
９ｂより電池外方側に延出して、封止リベット１１の注
液孔４への封止完了時には切り離される基端軸部１０ａ
とに分かれる軸部と、先端軸部１０ｃに一体形成されて
中空部の直径より大きな０．７５ｍｍに形成された頭部
１０ｄとからなり、マンドレル１０の全長は３０ｍｍに
構成した。The mandrel 10 is made of iron plated with nickel, and the rivet body 9 is separated by the easily breakable portion 10b.
A tip shaft portion 10c fitted into the hollow portion of a and a base shaft portion 10a extending outward of the battery from the flange portion 9b and separated when the sealing of the sealing rivet 11 into the liquid injection hole 4 is completed.
The mandrel 10 has a total length of 30 mm. The mandrel 10 has a shaft portion divided into two parts, and a head part 10 d integrally formed with the tip shaft part 10 c and having a diameter of 0.75 mm larger than the diameter of the hollow part.
【００４４】中空リベット９のリベット本体９ａおよび
マンドレル１０の頭部１０ｄが、有底円筒状の凹部１２
ａの外径が０．８５ｍｍで、その口部外周に設けられた
鍔部１２ｂの厚みが０．０５ｍｍからなるフッ素樹脂製
の凹型ガスケット１２にて、包み込むように装着した。
この封止リベット１１と凹型ガスケット１２を用いて、
実施例１と同様の封止方法にて注液孔４の封止を完了さ
せた。The rivet body 9a of the hollow rivet 9 and the head 10d of the mandrel 10 have a bottomed cylindrical concave portion 12.
An outer diameter of a was 0.85 mm, and a flange portion 12b provided on the outer circumference of the mouth portion was fitted with a concave gasket 12 made of fluororesin having a thickness of 0.05 mm.
Using this sealing rivet 11 and concave gasket 12,
The sealing of the liquid injection hole 4 was completed by the same sealing method as in Example 1.
【００４５】（実施例３）実施例２で用いた凹部ガスケ
ット１２の代わりに、同じ樹脂製で円筒部１３ａとその
口部外周に設けられた鍔部１３ｂからなる円筒型ガスケ
ット１３を、封止リベット１１のリベット本体９ａを包
むように装着した円筒型ガスケット１３を用いた以外
は、実施例２と同様の封止方法にて注液孔４の封止を完
了させた。(Embodiment 3) Instead of the recessed gasket 12 used in Embodiment 2, a cylindrical gasket 13 made of the same resin and comprising a cylindrical portion 13a and a collar portion 13b provided on the outer periphery of the mouth portion is sealed. Sealing of the liquid injection hole 4 was completed by the same sealing method as in Example 2 except that the cylindrical gasket 13 mounted so as to wrap the rivet body 9a of the rivet 11 was used.
【００４６】（実施例４）実施例３で用いた封止リベッ
ト１１のリベット本体９ａを包むように装着した円筒型
ガスケット１３に加え、厚さ０．０３ｍｍのポリプロピ
レン樹脂製シート１４を、リベット本体９ａ内周壁とマ
ンドレル１０の軸部１０ａ、１０ｂとの間に挿入した以
外は、実施例３と同様の封止方法にて注液孔４の封止を
完了させた。(Embodiment 4) In addition to the cylindrical gasket 13 mounted so as to enclose the rivet body 9a of the sealing rivet 11 used in Embodiment 3, a polypropylene resin sheet 14 having a thickness of 0.03 mm is attached to the rivet body 9a. The sealing of the liquid injection hole 4 was completed by the same sealing method as in Example 3, except that the inner peripheral wall and the shaft portions 10a and 10b of the mandrel 10 were inserted.
【００４７】（実施例５）図６に示すように、実施例１
で用いた中空リベット９とその中空部を貫通するマンド
レル１０とから構成される封止リベット１１に加え、注
液孔４の側周壁とリベット本体９ａとの間およびリベッ
ト本体９ａとマンドレル１０の軸部１０ａ、１０ｂとの
間にブロンアスファルトからなる封止剤１５が介在する
ようにした以外は、実施例１と同様の封止方法にて注液
孔４の封止を完了させた。(Embodiment 5) As shown in FIG.
In addition to the sealing rivet 11 composed of the hollow rivet 9 and the mandrel 10 that penetrates the hollow portion, between the side peripheral wall of the liquid injection hole 4 and the rivet body 9a and between the rivet body 9a and the shaft of the mandrel 10. The sealing of the liquid injection hole 4 was completed by the same sealing method as in Example 1 except that the sealing agent 15 made of blown asphalt was interposed between the portions 10a and 10b.
【００４８】実施例１〜実施例５において、マンドレル
１０の軸部１０ａが封口板１の上面に出ているので、取
扱い易くなり、供給時の供給不良は発生しなかった。な
お、注液孔４はその加工容易性から封口板１に設けた実
施例を示したが、電池ケース２の幅寸法の上部に設けて
も同様の結果が得られた。In Examples 1 to 5, since the shaft portion 10a of the mandrel 10 was exposed on the upper surface of the sealing plate 1, it was easy to handle and no supply failure occurred during supply. Although the injection hole 4 is provided in the sealing plate 1 because of its ease of processing, the same result was obtained even if the injection hole 4 was provided above the width of the battery case 2.
【００４９】（比較例）図７に示すように、注液孔４よ
り胴部を短く形成した封止リベット１１Ａを注液孔４に
挿入し、注液孔４およびその周縁部を清掃することな
く、封止リベット１１Ａをレーザー溶接して注液孔４の
封止を完了させた。(Comparative Example) As shown in FIG. 7, a sealing rivet 11A having a body shorter than the liquid injection hole 4 is inserted into the liquid injection hole 4 to clean the liquid injection hole 4 and its peripheral portion. Instead, the sealing rivet 11A was laser-welded to complete the sealing of the liquid injection hole 4.
【００５０】このようにして得られた実施例１〜実施例
５、比較例の密閉型電池ｎ＝１００個を用い、６０℃−
９０％ＲＨ中で４週間放置後に漏液した個数を目視にて
判定することによって、耐漏液性を評価し、その結果を
表１に示す。Using the thus obtained sealed batteries of Examples 1 to 5 and Comparative Example n = 100, 60 ° C-
The liquid leakage resistance was evaluated by visually observing the number of liquids that had leaked after being left in 90% RH for 4 weeks, and the results are shown in Table 1.
【００５１】[0051]
【表１】
上記表１から明らかなように、比較例の密閉型電池では
封止不良が１５％発生しているのに対して、実施例１〜
実施例５の密閉型電池では、封止不良は発生しなかっ
た。[Table 1] As is clear from Table 1 above, in the sealed battery of the comparative example, a sealing defect of 15% occurred, whereas in Examples 1 to 1
In the sealed battery of Example 5, no sealing failure occurred.
【００５２】注液孔４の周縁部において、電池外方側で
はフランジ部９ｂとの間、また電池内方側ではリベット
本体９ａの先端（封止リベット１１の胴部先端）との間
でそれぞれ密着状態となり信頼性の高い封止ができてい
る為である。In the peripheral portion of the liquid injection hole 4, between the flange portion 9b on the outside of the battery and the tip of the rivet body 9a (the tip of the body of the sealing rivet 11) on the inside of the battery. This is because they are in close contact with each other and highly reliable sealing is possible.
【００５３】これに対して、比較例の密閉型電池の封止
不良の原因は、注液孔４およびその周縁部に付着してい
る電解液が、注液孔４の外周をレーザー溶接した時にス
パッタを発生させブローホールが生じることによるもの
である。On the other hand, the cause of the poor sealing of the sealed battery of the comparative example is that the electrolyte solution adhering to the liquid injection hole 4 and its peripheral portion is laser-welded to the outer periphery of the liquid injection hole 4. This is because spatter is generated and blow holes are generated.
【００５４】[0054]
【発明の効果】本発明は、以上に説明してきたような封
止リベット用いて注液孔を封止することによって、従来
のレーザー等の溶接を用いた封止機構や封止方法と比較
して、封止性能については遜色無く、また付着した電解
液によって発生するスパッタに起因する封止不良による
電解液漏れが無く、さらに封止リベットを用いて取扱い
易くすることで供給不良を無くし生産性を向上できる
上、レーザー溶接等の設備を用いないため、設備投資が
かからずコストダウンを図れる。これにより高性能な密
閉型電池を安価に提供することができる。INDUSTRIAL APPLICABILITY The present invention compares the conventional sealing mechanism and method using welding such as laser by sealing the injection hole with the sealing rivet as described above. In terms of sealing performance, there is no leakage of electrolytic solution due to defective sealing due to spatter generated by the adhered electrolytic solution. Furthermore, it is easy to handle using sealing rivets to eliminate supply defects and improve productivity. In addition, since equipment such as laser welding is not used, capital investment is not required and cost can be reduced. As a result, a high-performance sealed battery can be provided at low cost.
【図１】本発明の実施形態の密閉型電池の要部概略構成
を示す断面図。FIG. 1 is a sectional view showing a schematic configuration of a main part of a sealed battery according to an embodiment of the present invention.
【図２】本発明の第１実施形態に係る封止リベットの断
面図。FIG. 2 is a cross-sectional view of the sealing rivet according to the first embodiment of the present invention.
【図３】本発明の第１実施形態係る注液孔の封止方法を
（ａ）〜（ｇ）の工程順に示す断面図。FIG. 3 is a cross-sectional view showing the method of sealing a liquid injection hole according to the first embodiment of the present invention in the order of steps (a) to (g).
【図４】本発明の第２実施形態に係る封止リベットの封
止機構を示す断面図。FIG. 4 is a sectional view showing a sealing mechanism of a sealing rivet according to a second embodiment of the present invention.
【図５】本発明の第３実施形態に係る封止リベットの封
止機構を示す断面図。FIG. 5 is a sectional view showing a sealing mechanism of a sealing rivet according to a third embodiment of the present invention.
【図６】本発明の第４実施形態に係る封止リベットの封
止機構を示す断面図。FIG. 6 is a sectional view showing a sealing mechanism of a sealing rivet according to a fourth embodiment of the present invention.
【図７】従来の封止機構を含む密閉型電池の概略構成を
示す断面図。FIG. 7 is a cross-sectional view showing a schematic configuration of a sealed battery including a conventional sealing mechanism.
１ 封口板 ２ 電池ケース ３ 発電要素 ４ 注液孔 ９ 中空リベット ９ａ リベット本体（封止リベットの胴部） ９ｂ フランジ部 １０ マンドレル １０ａ 基端軸部 １０ｂ 易破断部 １０ｃ 先端軸部 １０ｄ 頭部 １１ 封止リベット １２ 凹型ガスケット（樹脂） １３ 円筒型ガスケット（樹脂） １４ 樹脂シート（樹脂） １５ 封止剤（樹脂） 1 Seal plate 2 battery case 3 power generation elements 4 Injection hole 9 hollow rivets 9a Rivet body (body of sealed rivet) 9b Flange part 10 Mandrels 10a Base end shaft 10b Easy break 10c Tip shaft part 10d head 11 sealed rivets 12 Recessed gasket (resin) 13 Cylindrical gasket (resin) 14 Resin sheet (resin) 15 Sealant (resin)
Claims (6)
池ケースの開口部を封口する封口板と、前記電池ケース
または封口板のいずれか一方に設けられ、電池ケース内
に電解液を注入する注液孔と、この注液孔を封止する封
止リベットからなる密閉型電池であって、前記封止リベ
ットが、注液孔より長く形成された胴部とその胴部基端
に一体形成されるフランジ部とからなり、注液孔より電
池内方側に突出する胴部先端を変形させることによっ
て、その注液孔周縁部にかしめ圧着して注液孔が封止さ
れていることを特徴とする密閉型電池。1. A battery case accommodating a power generating element, a sealing plate for sealing an opening of the battery case, and either one of the battery case and the sealing plate, and an electrolyte solution is injected into the battery case. What is claimed is: 1. A sealed battery comprising a liquid injection hole and a sealing rivet for sealing the liquid injection hole, wherein the sealed rivet is integrally formed on a body part formed longer than the liquid injection hole and a base end of the body part. The flange part, which is made up of a flange part that is located inside the battery, is deformed at the tip of the body part that protrudes inward of the battery from the liquid injection hole. Characteristic sealed battery.
成されたリベット本体およびその基端に一体形成される
フランジ部からなる中空リベットと、易破断部より基端
側の軸部を前記フランジ部より電池外方に延出させると
共に、易破断部より先端側の軸部を前記リベット本体の
中空部に嵌挿される軸部、およびその先端に中空部の寸
法より大きな寸法の頭部からなるマンドレルとから構成
され、前記軸部は、注液孔の封止時には易破断部より破
断されて先端側の軸部を中空部に残し、基端側の軸部が
切り離されるものである請求項１記載の密閉型電池。2. The hollow rivet, wherein the sealing rivet is composed of a rivet body formed longer than a liquid injection hole and a flange portion integrally formed with a base end of the rivet body, and a shaft portion on a base end side of an easily breakable portion. While extending from the flange portion to the outside of the battery, the shaft portion on the tip side of the easily breakable portion is inserted into the hollow portion of the rivet body, and from the head portion having a dimension larger than the dimension of the hollow portion at the tip thereof. The mandrel, the shaft portion is ruptured from the easily breakable portion at the time of sealing the injection hole, leaving the shaft portion on the tip side in the hollow portion, and the shaft portion on the base end side is separated. The sealed battery according to item 1.
周壁との間の全面またはその一部に、樹脂が介在してい
る請求項１または２記載の密閉型電池。3. The sealed battery according to claim 1, wherein a resin is present on the entire surface or a part thereof between the outer peripheral wall of the sealing rivet and the side peripheral wall of the liquid injection hole.
側周壁との間の全面またはその一部に、樹脂が介在して
いる請求項２記載の密閉型電池。4. The sealed battery according to claim 2, wherein the resin is interposed on the entire surface or a part thereof between the inner peripheral wall of the rivet body and the mandrel side peripheral wall.
である請求項３または４記載の密閉型電池。5. The sealed battery according to claim 3, wherein the resin is a resin sheet or a sealant.
およびその基端に一体形成されるフランジ部からなる中
空リベットと、易破断部より基端側の軸部を前記フラン
ジ部より電池外方に延出させると共に、易破断部より先
端側の軸部を前記リベット本体の中空部に嵌挿される軸
部、およびその先端に中空部の寸法より大きな寸法の頭
部からなるマンドレルとから構成した封止リベットを用
い、電池ケースの開口部を封口板で封口し、電池ケース
または封口板のいずれか一方に設けられた注液孔から電
解液を注入した後、前記注液孔に、中空リベットのフラ
ンジ部が電池外方側に配されるようにしてそのリベット
本体を挿入した後、フランジ部を押圧しつつマンドレル
を電池外方に引き上げることにより、注液孔より電池内
方側に突出するリベット本体先端をマンドレルの頭部の
外面と注液孔周縁部との間に挟持した状態で、易破断部
を破断し、先端側の軸部をリベット本体の中空部に残し
て基端側の軸部を切り離し、注液孔を封止することを特
徴とする注液孔の封止方法。6. A hollow rivet consisting of a rivet body formed longer than the liquid injection hole and a flange portion integrally formed at the base end thereof, and a shaft portion on the base end side of the easily breakable portion is located outside the battery from the flange portion. And a shaft portion on the tip side of the easily breakable portion is inserted into the hollow portion of the rivet body, and a mandrel having a head portion having a dimension larger than that of the hollow portion at the tip thereof. Use a sealing rivet to seal the opening of the battery case with a sealing plate, and inject the electrolyte from the liquid injection hole provided in either the battery case or the sealing plate, and then fill the hollow hole with a hollow rivet. After inserting the rivet body so that the flange part is arranged on the outside of the battery, pull out the mandrel to the outside of the battery while pressing the flange part so that the mandrel projects from the liquid injection hole to the inside of the battery. Ribe With the tip of the butt body sandwiched between the outer surface of the head of the mandrel and the periphery of the injection hole, the easily breakable portion is broken, and the tip side shaft is left in the hollow part of the rivet body A method for sealing a liquid injection hole, which comprises cutting off a shaft portion of the device and sealing the liquid injection hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001325798A JP2003132876A (en) | 2001-10-24 | 2001-10-24 | Sealed battery and liquid pouring hole sealing method the battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001325798A JP2003132876A (en) | 2001-10-24 | 2001-10-24 | Sealed battery and liquid pouring hole sealing method the battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2003132876A true JP2003132876A (en) | 2003-05-09 |
Family
ID=19142291
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001325798A Pending JP2003132876A (en) | 2001-10-24 | 2001-10-24 | Sealed battery and liquid pouring hole sealing method the battery |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2003132876A (en) |
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| CN1310348C (en) * | 2003-12-20 | 2007-04-11 | 鸿富锦精密工业（深圳）有限公司 | Sealing structure of lithium ion battery |
| JP2012146587A (en) * | 2011-01-14 | 2012-08-02 | Hitachi Vehicle Energy Ltd | Sealed secondary battery |
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| FR3016736A1 (en) * | 2014-01-17 | 2015-07-24 | Commissariat Energie Atomique | LITHIUM-ION BATTERY (LI-ION) CAPACITY INCREASED BY INCREASE IN HEIGHT AVAILABLE INSIDE THE HOUSING |
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| CN1297019C (en) * | 2003-12-20 | 2007-01-24 | 鸿富锦精密工业（深圳）有限公司 | Method for sealing lithium ion battery |
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| JP2012146587A (en) * | 2011-01-14 | 2012-08-02 | Hitachi Vehicle Energy Ltd | Sealed secondary battery |
| JP2013020729A (en) * | 2011-07-07 | 2013-01-31 | Toyota Motor Corp | Battery and manufacturing method thereof |
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