JP2001110452A - Manufacturing method of nonaqueous electrolytic battery - Google Patents

Manufacturing method of nonaqueous electrolytic battery

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Publication number
JP2001110452A
JP2001110452A JP28699899A JP28699899A JP2001110452A JP 2001110452 A JP2001110452 A JP 2001110452A JP 28699899 A JP28699899 A JP 28699899A JP 28699899 A JP28699899 A JP 28699899A JP 2001110452 A JP2001110452 A JP 2001110452A
Authority
JP
Japan
Prior art keywords
battery
aqueous electrolyte
opening
gasket
positive electrode
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
Application number
JP28699899A
Other languages
Japanese (ja)
Other versions
JP2001110452A5 (en
Inventor
Kazunori Fujita
和紀 藤田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sony Corp
Original Assignee
Sony Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sony Corp filed Critical Sony Corp
Priority to JP28699899A priority Critical patent/JP2001110452A/en
Publication of JP2001110452A publication Critical patent/JP2001110452A/en
Publication of JP2001110452A5 publication Critical patent/JP2001110452A5/ja
Pending legal-status Critical Current

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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
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

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  • Secondary Cells (AREA)

Abstract

PROBLEM TO BE SOLVED: To surely prevent or suppress leakage of electrolytic solution using simple steps, without having to change each part of constructions and specifications of the steps. SOLUTION: After a body of electrodes and nonaqueous electrolytic solution 8 have been filled in an electrode can 2, where a positive electrode material 5 and a negative electrode material 6 are wound around the body of electrodes via a separator 7, an electrode terminal member 4 is attached to an opening 3 of the electrode can 2 via a gasket 22 for closing the opening. A step to remove nonaqueous electrolytic solution is added after a step for injecting nonaqueous electrolytic solution 8. In a step for removing a nonaqueopus electrolytic solution, nonaqueous electrolytic solution attached to an inner circumferencial area 24 of the electrode can 2, with which the gasket 22 is engaged, is removed.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【発明の属する技術分野】本発明は、非水電解液電池の
製造方法に関し、さらに詳しくは非水電解液の漏液の抑
制若しくは防止を図った非水電解液電池の製造方法に関
する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a non-aqueous electrolyte battery, and more particularly, to a method for manufacturing a non-aqueous electrolyte battery in which leakage of the non-aqueous electrolyte is suppressed or prevented.

【０００２】[0002]

【従来の技術】電池は、各種の携帯型電子機器の電源と
して用いられており、特に繰り返し充電が可能である二
次電池の需要が大きい。二次電池としては、従来鉛電池
やニッケル−カドミウム蓄電池が用いられていたが、携
帯型電子機器の小型軽量化或いは多機能化と長時間使用
の要求を実現するニッケル−水素蓄電池やリチウムイオ
ン二次電池が注目されている。2. Description of the Related Art Batteries are used as power sources for various portable electronic devices, and in particular, there is a great demand for rechargeable secondary batteries. Conventionally, lead-acid batteries and nickel-cadmium storage batteries have been used as secondary batteries. However, nickel-hydrogen storage batteries and lithium-ion rechargeable batteries that realize the demand for smaller and lighter or multifunctional and longer-term use of portable electronic devices have been used. The next battery is attracting attention.

【０００３】これらリチウムイオン二次電池等において
は、電解液として電解質塩を含む水溶液或いは非水溶液
が用いられ、電池缶からの漏液が生じた場合に機器筐体
や周囲の電子部品等を腐食させたりする虞がある。した
がって、リチウムイオン二次電池等においては、電解液
の漏液を生じさせないように、電池缶の開口部を電極部
材によって密閉する構造が採用されている。かかる電池
の密閉構造としては、大別してガスケットを介して電極
部材を開口部にかしめ封口する構造と、電極部材を開口
部にレーザ溶接する構造とが採用されている。[0003] In these lithium ion secondary batteries and the like, an aqueous solution or a non-aqueous solution containing an electrolyte salt is used as an electrolytic solution, and when a liquid leaks from a battery can, the casing of the device and surrounding electronic components are corroded. May be caused. Therefore, in a lithium ion secondary battery or the like, a structure is adopted in which the opening of the battery can is sealed with an electrode member so as not to cause leakage of the electrolytic solution. As the hermetically sealed structure of the battery, there are generally adopted a structure in which an electrode member is caulked to an opening via a gasket, and a structure in which the electrode member is laser-welded to the opening.

【０００４】レーザ溶接構造は、電池缶の内周壁と電極
部材の外周縁とを溶着接合する構造であることから、溶
接精度にもよるが比較的安定した封口構造であって電解
液の漏液が生じにくいといった特徴がある。しかしなが
ら、レーザ溶接構造は、電池缶の開口部に全周に亘って
高精度のレーザ溶接を施すことで、かしめ封口構造と比
較して工数がかかるととともに発熱や発生ガスの対応が
必要である。したがって、比較的小型の二次電池等に
は、一般にかしめ封口構造が採用されることが多い。The laser welding structure is a structure in which the inner peripheral wall of the battery can and the outer peripheral edge of the electrode member are welded and joined together. Is less likely to occur. However, the laser welded structure requires high precision laser welding over the entire periphery of the opening of the battery can, which requires more man-hours than the caulked-sealing structure, and also needs to deal with heat generation and generated gas. . Therefore, a caulked sealing structure is generally adopted for a relatively small secondary battery or the like.

【０００５】例えば、リチウムイオン二次電池５０は、
図５に示すように負極端子を構成する電池缶５１の内部
に正極材５２と負極材５３とをセパレータ５４を介して
重ね合わせた状態で収納し、非水電解液５５を注入した
後にガスケット５７を介して正極端子部材５６によって
開口部５８をかしめ封口してなる。電池缶５１には、開
口部５８に、外周壁を内方へと絞り込んでガスケット５
７を装着するための受け部５９が一体に形成されてい
る。For example, a lithium ion secondary battery 50 is
As shown in FIG. 5, a positive electrode material 52 and a negative electrode material 53 are housed in a battery can 51 constituting a negative electrode terminal in a state where the positive electrode material 52 and the negative electrode material 53 are overlapped with a separator 54 interposed therebetween. The opening 58 is swaged and closed by the positive electrode terminal member 56 through the opening. In the battery can 51, the outer peripheral wall is squeezed inward into the opening 58 so that the gasket 5
The receiving portion 59 for mounting the dia. 7 is integrally formed.

【０００６】リチウムイオン二次電池５０においては、
受け部５９によってガスケット５７の外周縁の底面を支
えた状態で、開口部５８を構成する電池缶５１の外周
縁、すなわちかしめ部位６０を円弧状に折曲するカシメ
処理が施される。ガスケット５７は、正極端子部材５６
の外周縁を挟み込んだ状態で、受け部５９とかしめ部位
６０との間でかしめられることで電池缶５１の開口部５
８を全周に亘って封口する。In the lithium ion secondary battery 50,
While the bottom surface of the outer peripheral edge of the gasket 57 is supported by the receiving portion 59, the outer peripheral edge of the battery can 51 constituting the opening portion 58, that is, the caulking portion 60 is crimped to bend in an arc shape. The gasket 57 includes a positive terminal member 56.
Is crimped between the receiving portion 59 and the caulking portion 60 with the outer peripheral edge of the battery can 51 held therebetween.
8 is sealed over the entire circumference.

【０００７】[0007]

【発明が解決しようとする課題】ところで、上述したリ
チウムイオン二次電池５０においては、高温にさらされ
たり、高温と低温とに交互にさらされるような劣悪な使
用環境或いは誤って落下させる等の場合に、かしめ部位
６０が変形したりクリープ現象が生じたりする。リチウ
ムイオン二次電池５０においては、このためにかしめ部
位６０から非水電解液５５が漏液するといった問題が発
生することがあった。In the above-described lithium ion secondary battery 50, however, it is difficult to expose the lithium ion secondary battery 50 to a high temperature, a bad use environment where the battery is alternately exposed to a high temperature and a low temperature, or to accidentally drop the battery. In this case, the swaged portion 60 is deformed or a creep phenomenon occurs. For this reason, in the lithium ion secondary battery 50, a problem that the nonaqueous electrolyte 55 leaks from the swaged portion 60 may occur.

【０００８】本出願人は、かかる漏液現象についてその
原因を鋭意解析を重ねた結果、電池缶５１の受け部５９
とかしめ部位６０との間の内周面とガスケット５７との
間に封じ込められた非水電解液５５がしみ出るものであ
って、受け部５９から下方の電池缶５１の内部に注入さ
れた非水電解液５５が漏液するものでは無いことを確認
した。すなわち、リチウムイオン二次電池５０において
は、上述したように電池缶５１の開口部５８に受け部５
９が形成されており、非水電解液５５が内部に注入され
る際にこの受け部５９に付着残留する。The present applicant has conducted intensive analysis on the cause of such a liquid leakage phenomenon, and as a result, the receiving portion 59 of the battery can 51
The non-aqueous electrolyte solution 55 sealed between the gasket 57 and the inner peripheral surface between the caulking portion 60 oozes out, and the non-aqueous electrolyte solution injected into the battery can 51 below from the receiving portion 59. It was confirmed that the water electrolyte 55 did not leak. That is, in the lithium ion secondary battery 50, as described above, the receiving portion 5 is formed in the opening 58 of the battery can 51.
9 is formed and adheres to and remains on the receiving portion 59 when the non-aqueous electrolyte 55 is injected into the inside.

【０００９】リチウムイオン二次電池５０においては、
この状態でガスケット５７を介して開口部５８のかしめ
封口が行われると、図５に示すようにガスケット５７と
受け部５９やかしめ部位６０との間に形成されるクリア
ランスによる間隙６１、６２内に非水電解液５５が封じ
込められた状態となる。リチウムイオン二次電池５０に
おいては、かしめ部位６０の変形やクリープ現象等によ
って、この間隙６１、６２内に付着残留した非水電解液
５５が外部へとしみ出ることで漏液現象が発生する。In the lithium ion secondary battery 50,
In this state, when the opening portion 58 is swaged and closed via the gasket 57, as shown in FIG. 5, the gaps 61 and 62 formed by the clearance formed between the gasket 57 and the receiving portion 59 or the swaged portion 60 are inserted. The non-aqueous electrolyte 55 is in a sealed state. In the lithium ion secondary battery 50, the nonaqueous electrolyte 55 adhered and remaining in the gaps 61 and 62 exudes to the outside due to deformation and creep of the swaged portion 60, thereby causing a liquid leakage phenomenon.

【００１０】リチウムイオン二次電池５０においては、
例えばガスケット５７と受け部５９やかしめ部位６０と
の間のクリアランスをより小さくするいわゆる強いかし
め処理を施すことによって、開口部５８に残留する非水
電解液５５の量を低減する対応が図られる。しかしなが
ら、かかる対応は、電池缶５１やガスケット５７を高精
度に製作するとともに組立精度も必要となるためにコス
トアップや生産性の低下といった問題を生じさせ、また
充分な漏液防止が達成されないものであった。In the lithium ion secondary battery 50,
For example, by performing a so-called strong caulking process for reducing the clearance between the gasket 57 and the receiving portion 59 or the caulking portion 60, the amount of the nonaqueous electrolyte 55 remaining in the opening 58 can be reduced. However, such measures require high precision in manufacturing the battery can 51 and the gasket 57 and also require assembling precision, thereby causing a problem such as an increase in cost and a decrease in productivity, and a case in which sufficient liquid leakage prevention is not achieved. Met.

【００１１】また、リチウムイオン二次電池５０におい
ては、例えば電池缶５１の板厚を厚くすることによっ
て、ガスケット５７に対するかしめ部位６０のかしめ強
度を大きくする対応が図られる。しかしながら、リチウ
ムイオン二次電池５０は、電池缶５１の板厚が厚くなる
ことによって、電池缶５１の加工が面倒となるとともに
体積に対する電池容量比が低下する等の問題を生じさ
せ、また充分な漏液防止が達成されないものであった。In the lithium ion secondary battery 50, for example, by increasing the thickness of the battery can 51, it is possible to increase the caulking strength of the caulking portion 60 with respect to the gasket 57. However, the lithium ion secondary battery 50 causes problems such as processing of the battery can 51 becoming troublesome and a reduction in the battery capacity ratio to the volume due to the increase in the thickness of the battery can 51, and a sufficient Liquid leakage prevention was not achieved.

【００１２】さらに、リチウムイオン二次電池５０にお
いては、例えばかしめ部位６０によるガスケット５７の
圧縮率を高くする対応も図られる。しかしながら、リチ
ウムイオン二次電池５０は、仕様を変えたガスケット５
７を用いるとともに、かしめ工程の仕様も変更する必要
がある。リチウムイオン二次電池５０は、かかる対応に
よっても充分な漏液防止を達成し得ない。Further, in the lithium ion secondary battery 50, for example, it is possible to increase the compression ratio of the gasket 57 by the caulking portion 60. However, the lithium-ion secondary battery 50 is different from the gasket 5 whose specification is changed.
7 and the specifications of the caulking process need to be changed. The lithium ion secondary battery 50 cannot achieve sufficient liquid leakage prevention by such measures.

【００１３】したがって、本発明は、構成各部材や工程
仕様を変更すること無く、簡易な工程によって電解液の
漏液が確実に防止されるようにした非水電解液電池の製
造方法を提供することを目的に提案されたものである。Accordingly, the present invention provides a method of manufacturing a non-aqueous electrolyte battery in which leakage of an electrolyte can be reliably prevented by a simple process without changing constituent members and process specifications. It has been proposed for the purpose.

【００１４】[0014]

【課題を解決するための手段】上述した目的を達成する
本発明にかかる非水電解液電池の製造方法は、電極缶の
内部に、正極材と負極材とをセパレータを介して重ね合
わせてなる発電体と非水電解液とを充填した後に、電極
缶の開口部にガスケットを介して電極端子部材をかしめ
封口する。非水電解液電池の製造方法は、非水電解液の
注入工程後に、電極缶の開口部に対して、ガスケットが
嵌合される内周部位に付着した非水電解液を除去する非
水電解液除去工程を施す。A method of manufacturing a non-aqueous electrolyte battery according to the present invention, which achieves the above-mentioned object, comprises a positive electrode material and a negative electrode material stacked inside an electrode can with a separator interposed therebetween. After filling the power generator and the non-aqueous electrolyte, the electrode terminal member is caulked to the opening of the electrode can via a gasket and sealed. The method of manufacturing a non-aqueous electrolyte battery includes a non-aqueous electrolyte which removes a non-aqueous electrolyte attached to an inner peripheral portion where a gasket is fitted into an opening of an electrode can after a non-aqueous electrolyte injection step. A liquid removing step is performed.

【００１５】以上のように構成された本発明にかかる非
水電解液電池の製造方法によれば、注入時に電極缶の開
口部に付着残留して漏液を生じさせる非水電解液を除去
した状態でガスケットを介してかしめ封口が行われるこ
とで、漏液の発生が防止或いは抑制された非水電解液電
池の製造を可能とする。非水電解液電池の製造方法によ
れば、構成各部材の仕様を要せず、また簡易な非水電解
液の除去工程を施すことで全体の工程仕様の変更を要し
ないことから、信頼性の高い非水電解液電池を低コスト
でかつ高生産性を以って製造することを可能とする。According to the method of manufacturing a non-aqueous electrolyte battery according to the present invention, the non-aqueous electrolyte which remains at the opening of the electrode can at the time of injection and causes leakage is removed. By performing swaging and sealing via a gasket in this state, it is possible to manufacture a nonaqueous electrolyte battery in which the occurrence of liquid leakage is prevented or suppressed. According to the method of manufacturing a non-aqueous electrolyte battery, the specifications of each component are not required, and the simple process of removing the non-aqueous electrolyte does not require a change in the overall process specifications. It is possible to manufacture a non-aqueous electrolyte battery with high cost at low cost and with high productivity.

【００１６】[0016]

【発明の実施の形態】以下、本発明の実施の形態につい
て、図面を参照して詳細に説明する。実施の形態として
示すリチウムイオン二次電池１は、従来のリチウムイオ
ン二次電池５０と基本的な構成を同様とし、図１に示す
ように有底円筒状に形成されるとともに負極端子を構成
する電池缶２の開口部３を正極端子構体４によってかし
め封口してなる。リチウムイオン二次電池１は、電池缶
２の内部に正極材５と負極材６とセパレータ７とからな
る電極材を収納するとともに、非水電解液８を注入して
なる。Embodiments of the present invention will be described below in detail with reference to the drawings. The lithium ion secondary battery 1 shown in the embodiment has the same basic configuration as the conventional lithium ion secondary battery 50, and is formed in a bottomed cylindrical shape as shown in FIG. 1 and constitutes a negative electrode terminal. The opening 3 of the battery can 2 is swaged and closed with a positive electrode terminal structure 4. The lithium ion secondary battery 1 contains an electrode material including a positive electrode material 5, a negative electrode material 6, and a separator 7 in a battery can 2 and injects a non-aqueous electrolyte 8.

【００１７】正極材５は、アルミニウム箔等からなる帯
状の正極集電体９と、この正極集電体９の両面に塗布さ
れた正極活物質１０とからなる。正極活物質１０には、
例えばＴｉＳ2、ＭｏＳ2、ＮｂＳｅ2、Ｖ2Ｏ5等のリチ
ウムを含有しない金属硫化物や酸化物、或いはＬｉxＭ
Ｏ2（式中、Ｍは一種以上の遷移金属を表し、ｘは電池
の充放電状態によって異なり、通常０．０５以上１．１
０以下である。）を主体とするリチウム複合酸化物等が
用いられる。遷移金属Ｍには、例えばコバルト、ニッケ
ル、マンガンが用いられ、具体的にはＬｉＣｏＯ2、Ｌ
ｉＮｉＯ2、ＬｉＮｉyＣｏ1-yＯ2（０＜ｙ＜１）、Ｌｉ
Ｍｎ2Ｏ4が用いられる。正極活物質１０は、これら材料
にカーボン等の導電材とバインダ及び溶剤とが混合さ
れ、正極集電体９の両面に均一に塗布される。勿論、正
極活物質１０には、これら材料を単体で用いるばかりで
なく、複数を混合して用いてもよい。The positive electrode material 5 includes a strip-shaped positive electrode current collector 9 made of aluminum foil or the like, and a positive electrode active material 10 applied to both surfaces of the positive electrode current collector 9. The positive electrode active material 10 includes
Lithium-free metal sulfides or oxides such as TiS 2 , MoS 2 , NbSe 2 , V 2 O 5 , or Li x M
O 2 (wherein, M represents one or more transition metals, x varies depending on the charge / discharge state of the battery, and is usually 0.05 to 1.1.
0 or less. ) Is mainly used. As the transition metal M, for example, cobalt, nickel, or manganese is used. Specifically, LiCoO 2 , L
iNiO 2 , LiNi y Co 1-y O 2 (0 <y <1), Li
Mn 2 O 4 is used. The positive electrode active material 10 is obtained by mixing a conductive material such as carbon, a binder, and a solvent with these materials, and is uniformly applied to both surfaces of the positive electrode current collector 9. Of course, the positive electrode active material 10 may use not only these materials alone but also a mixture of a plurality of these materials.

【００１８】正極活物質１０は、例えばバインダとして
ポリフッ化ビニリデン（ＰＶｄＦ）が、溶媒としてｎ−
メチルピロドリン（ＮＭＰ）が用いられる。正極活物質
１０は、これらの材料を混合してスラリー状とし、例え
ばドクターブレード法等によって正極集電体９の主面上
に均一に塗布される。正極活物質１０は、高温乾燥処理
が施されることによってＮＭＰが飛ばされ、さらにロー
ルプレス処理が施されることによって高密度化が図られ
て正極集電体９に成膜形成される。The positive electrode active material 10 includes, for example, polyvinylidene fluoride (PVdF) as a binder and n-
Methyl pyrrolin (NMP) is used. The positive electrode active material 10 is formed into a slurry by mixing these materials, and is uniformly applied on the main surface of the positive electrode current collector 9 by, for example, a doctor blade method. The positive electrode active material 10 is subjected to a high-temperature drying treatment to blow off NMP, and further subjected to a roll press treatment to achieve a high density and to form a film on the positive electrode current collector 9.

【００１９】正極材５には、後述するように負極材６と
巻回された状態において最内周部となる正極集電体９の
一端部に正極活物質１０が塗布されない領域が構成さ
れ、この未塗布領域に正極集電タブ１１が接合されてい
る。正極集電タブ１１は、例えばアルミニウムやニッケ
ルによって形成され、図１に示すように正極材５から引
き出されて水平方向に対して略Ｕ字状に折曲される。正
極集電タブ１１は、後述するように正極材５等が電極缶
２の内部に装填された状態において、電極缶２の開口部
３の略中央部に延在位置する。As will be described later, the positive electrode material 5 has a region where the positive electrode active material 10 is not applied to one end of the positive electrode current collector 9 which is the innermost portion when wound around the negative electrode material 6. The positive electrode current collecting tab 11 is joined to the uncoated area. The positive electrode current collecting tab 11 is formed of, for example, aluminum or nickel, and is drawn out of the positive electrode material 5 and bent in a substantially U-shape in the horizontal direction as shown in FIG. As will be described later, the positive electrode current collecting tab 11 extends substantially at the center of the opening 3 of the electrode can 2 when the positive electrode material 5 and the like are loaded inside the electrode can 2.

【００２０】負極材６は、銅箔からなる帯状の負極集電
体１２と、この負極集電体１２の両面に塗布された負極
活物質１３とからなる。負極活物質１３は、リチウムイ
オンをドープ・脱ドープ可能な材料、例えばグラファイ
トや難黒鉛化炭素或いは易黒鉛化炭素等の炭素材料が用
いられる。負極活物質１３は、これら炭素材料に対し
て、例えばバインダとしてＰＶｄＦが、溶媒としてＮＭ
Ｐが加えられてスラリー状化したものが、例えばドクタ
ーブレード法等によって負極集電体１２の主面上に均一
に塗布される。負極活物質１３は、高温乾燥処理が施さ
れることによってＮＭＰが飛ばされ、さらにロールプレ
ス処理が施されることによって高密度化が図られて負極
集電体１２に成膜形成される。なお、負極活物質１３に
は、その素材として炭素材料の他にも、ポリアセチレ
ン、ポリプロピレン等の高分子材料やＳｎＯ2等の酸化
物も用いられる。The negative electrode material 6 comprises a strip-shaped negative electrode current collector 12 made of copper foil, and a negative electrode active material 13 applied to both surfaces of the negative electrode current collector 12. As the negative electrode active material 13, a material capable of doping / dedoping lithium ions, for example, a carbon material such as graphite, non-graphitizable carbon, or graphitizable carbon is used. The negative electrode active material 13 is composed of, for example, PVdF as a binder and NM as a solvent for these carbon materials.
The slurry obtained by adding P is uniformly applied on the main surface of the negative electrode current collector 12 by, for example, a doctor blade method. The negative electrode active material 13 is subjected to a high-temperature drying treatment to blow off NMP, and is further subjected to a roll press treatment to achieve a high density, thereby forming a film on the negative electrode current collector 12. The anode active material 13 may be made of a polymer material such as polyacetylene or polypropylene or an oxide such as SnO 2 , in addition to a carbon material.

【００２１】負極材６には、後述するように正極材５と
巻回された状態において最外周部となる負極集電体１２
の一端部に負極活物質１３が塗布されない領域が構成さ
れ、この未塗布領域に負極集電タブ１４が接合されてい
る。負極集電タブ１４は、例えば銅やニッケルによって
形成されている。負極集電タブ１４は、詳細を省略する
が、先端部がＬ字状に折曲されている。As will be described later, the negative electrode material 6 has a negative electrode current collector 12 which is the outermost peripheral portion when wound around the positive electrode material 5.
A region where the negative electrode active material 13 is not applied is formed at one end of the substrate, and the negative electrode current collecting tab 14 is joined to the non-applied region. The negative electrode current collecting tab 14 is formed of, for example, copper or nickel. Although the details of the negative electrode current collecting tab 14 are omitted, the tip is bent in an L-shape.

【００２２】セパレータ７は、リチウムイオンを通過さ
せる微多孔性質の帯状合成樹脂、例えばポリプロピレン
フィルムやポリエチレンによって形成される。セパレー
タ７は、正極材５や負極材６よりもやや幅広とされ、後
述するようにこれら正極材５と負極材６との間に挟み込
まれて巻回されることによってこれらを絶縁する。The separator 7 is formed of a microporous synthetic resin band through which lithium ions pass, for example, a polypropylene film or polyethylene. The separator 7 is slightly wider than the positive electrode material 5 and the negative electrode material 6, and is insulated by being sandwiched and wound between the positive electrode material 5 and the negative electrode material 6 as described later.

【００２３】非水電解液８は、溶媒に所定の濃度で電解
質を溶解してなる。溶媒には、例えば炭酸プロピレン、
炭酸エチレン或いは炭酸ブチレン等の環状カーボネート
や、炭酸ジメチル、炭酸エチルメチル、炭酸ジエチル或
いは炭酸ジプロピル等の鎖状カーボネートや、ジメトキ
シエタン、ジエトキシエタン、ジエトキシプロパン、ジ
オキソラン或いはジオキサン等のエーテル化合物が用い
られる。また、溶媒には、γブチルラクトン或いはσヘ
キシルラクトン等の環状エステル類や、スルホラン或い
はジメチルスルホラン等の有機イオウ化合物が用いられ
る。さらに、溶媒には、ぎ酸メチル、ぎ酸エチル、ぎ酸
プロピル、酢酸エステル化合物、プロピオン酸エステル
化合物等が用いられる。溶媒は、これらを単独で或いは
適宜混合して用いられる。電解質には、六フッ化燐酸リ
チウム、六フッ化砒酸リチウム、六フッ化アンチモン酸
リチウム、四フッ化珊酸リチウム、三フッ化メタンスル
ホン酸リチウム或いは三フッ化酢酸リチウム等が用いら
れる。The non-aqueous electrolyte 8 is obtained by dissolving an electrolyte in a solvent at a predetermined concentration. As the solvent, for example, propylene carbonate,
A cyclic carbonate such as ethylene carbonate or butylene carbonate, a chain carbonate such as dimethyl carbonate, ethylmethyl carbonate, diethyl carbonate or dipropyl carbonate, or an ether compound such as dimethoxyethane, diethoxyethane, diethoxypropane, dioxolan or dioxane is used. Can be As the solvent, a cyclic ester such as γ-butyl lactone or σ-hexyl lactone, or an organic sulfur compound such as sulfolane or dimethyl sulfolane is used. Further, as the solvent, methyl formate, ethyl formate, propyl formate, an acetate compound, a propionate compound and the like are used. The solvent is used alone or in a suitable mixture. As the electrolyte, lithium hexafluorophosphate, lithium hexafluoroarsenate, lithium hexafluoroantimonate, lithium tetrafluorocorate, lithium trifluoromethanesulfonate, lithium trifluoroacetate, or the like is used.

【００２４】リチウムイオン二次電池１は、上述した正
極材５と負極材６とをセパレータ７を介して重ね合わせ
て発電体を構成し、この発電体を電池缶２の形状に合わ
せて渦巻状に巻回したりつづら折りする。リチウムイオ
ン二次電池１は、この発電体をポリプロピレン等の絶縁
樹脂によって成形された上下一対のインシュレータ１５
ａ、１５ｂを介して電池缶２の内部に装填する。リチウ
ムイオン二次電池１は、図１に示すように正極材５の正
極集電タブ１１が電極缶２の開口部３の略中央部に延在
位置されるとともに、負極材６の負極集電タブ１４が電
極缶２の底面と接続される。The lithium ion secondary battery 1 forms a power generator by laminating the above-described positive electrode material 5 and negative electrode material 6 with a separator 7 interposed therebetween, and forms the power generator in a spiral shape according to the shape of the battery can 2. And wrap it around. The lithium ion secondary battery 1 includes a pair of upper and lower insulators 15 formed of an insulating resin such as polypropylene.
The battery is loaded into the battery can 2 via a and 15b. In the lithium-ion secondary battery 1, as shown in FIG. 1, the positive electrode current collecting tab 11 of the positive electrode material 5 is positioned to extend substantially at the center of the opening 3 of the electrode can 2, and the negative electrode current collector The tab 14 is connected to the bottom surface of the electrode can 2.

【００２５】リチウムイオン二次電池１においては、発
電体を装填した電池缶２内に非水電解液８が注入され
る。リチウムイオン二次電池１においては、詳細を後述
するように、電極缶２の開口部３に付着した非水電解液
８を除去する処理を施した後に、正極端子構体４の組付
が行われる。In the lithium ion secondary battery 1, a non-aqueous electrolyte 8 is injected into a battery can 2 in which a power generator is loaded. In the lithium ion secondary battery 1, as will be described in detail later, after performing a process of removing the nonaqueous electrolyte 8 attached to the opening 3 of the electrode can 2, the positive electrode terminal assembly 4 is assembled. .

【００２６】正極端子構体４は、図１及び図３に示すよ
うに正極端子蓋１６と、安全弁部材１７と、ＰＴＣ素子
１８と、押え部材１９と、電流遮断部材２０と、スプリ
ングプレート２１等の部材が組み合わされてなり、後述
するようにガスケット２２を介して電池缶２の開口部３
に組み付けられるとともにかしめ処理が施されてこの開
口部３を封口する。正極端子蓋１６は、電池缶２の開口
部３の開口径とほぼ等しい外径を有するとともに外周部
にフランジ部を有する全体浅皿状に形成されている。安
全弁部材１７も、電池缶２の開口部３の開口径とほぼ等
しい外径を有するとともに外周部にフランジ部を有する
全体浅皿状に形成されている。安全弁部材１７には、中
心部に断面半円弧状の接触部が突設されている。As shown in FIGS. 1 and 3, the positive terminal assembly 4 includes a positive terminal cover 16, a safety valve member 17, a PTC element 18, a pressing member 19, a current interrupting member 20, a spring plate 21, and the like. The members are combined, and the opening 3 of the battery can 2 is
And the caulking process is performed to seal the opening 3. The positive electrode terminal cover 16 has an outer diameter substantially equal to the opening diameter of the opening 3 of the battery can 2 and is formed in an overall shallow dish shape having a flange portion on the outer peripheral portion. The safety valve member 17 also has an outer diameter substantially equal to the opening diameter of the opening 3 of the battery can 2 and is formed in a generally shallow dish shape having a flange portion on the outer peripheral portion. The safety valve member 17 is provided with a contact portion having a semicircular cross section at the center thereof.

【００２７】正極端子板１６と安全弁部材１７とは、リ
ング状のＰＴＣ素子１８を介してそれぞれのフランジ部
が接合される。安全弁部材１７には、その底面部に、押
え部材１９と電流遮断部材２０とがその中心部に設けた
開口部から接触部を下方へと臨ませて組み合わされる。
スプリングプレート２１は、その開口部を閉塞するよう
にして電流遮断板２０の底面に組み付けられている。The flanges of the positive electrode terminal plate 16 and the safety valve member 17 are joined via a ring-shaped PTC element 18. The safety valve member 17 is combined with a holding member 19 and a current interrupting member 20 on the bottom surface of the safety valve member 17 with the contact portion facing downward from an opening provided at the center thereof.
The spring plate 21 is mounted on the bottom surface of the current interrupting plate 20 so as to close the opening.

【００２８】上述した正極端子構体４は、開口部３から
電池缶２の内部に組み込まれて、この電池缶２に形成し
た受け部２３上に保持される。受け部２３は、上述した
発電体の上端に対してやや高い位置で、電池缶２の外周
壁を全周に亘って断面円弧状に絞り込むことによって内
方へと突出された部位からなる。受け部２３は、その上
縁部で正極端子板１６と安全弁部材１７のフランジ部を
支えることによって正極端子構体４を保持する。The above-described positive electrode terminal structure 4 is incorporated into the battery can 2 through the opening 3 and is held on a receiving portion 23 formed in the battery can 2. The receiving portion 23 is formed at a position slightly higher than the upper end of the power generating body described above, and protrudes inward by narrowing the outer peripheral wall of the battery can 2 into an arc-shaped cross section over the entire circumference. The receiving portion 23 holds the positive electrode terminal structure 4 by supporting the positive electrode terminal plate 16 and the flange portion of the safety valve member 17 at its upper edge.

【００２９】リチウムイオン二次電池１は、上述した電
池缶２に対する正極端子構体４の組み込みに際して、開
口部３の内周面にガスケット２２があてがわれる。ガス
ケット２２は、例えばポリプロピレン等の合成樹脂によ
って図３に示すように電池缶２の内径よりもやや大径で
あるリング状の基部２２ａと、この基部２２ａの底面に
全周に亘って一体に突設された受け部２３の内径とほぼ
等しい外径の袴部２２ｂとからなる。ガスケット２２に
は、基部２２ａの内周部に、接合された正極端子板１６
と安全弁部材１７とのフランジ部の外周部が相対嵌合さ
れる嵌合溝２２ｃが形成されている。In the lithium ion secondary battery 1, a gasket 22 is applied to the inner peripheral surface of the opening 3 when the positive electrode terminal structure 4 is assembled into the above-described battery can 2. As shown in FIG. 3, the gasket 22 is formed of a synthetic resin such as polypropylene, and has a ring-shaped base 22a having a diameter slightly larger than the inner diameter of the battery can 2, and is integrally formed on the bottom surface of the base 22a. And a hakama portion 22b having an outer diameter substantially equal to the inner diameter of the provided receiving portion 23. The gasket 22 has a positive terminal plate 16 joined to the inner peripheral portion of the base 22a.
A fitting groove 22c is formed in which the outer peripheral portion of the flange portion of the safety valve member 17 is relatively fitted.

【００３０】リチウムイオン二次電池１においては、図
３に示すように開口部３を構成する電池缶２の外周縁部
２４を、全周に亘って内方へと折り込むかしめ処理が施
される。リチウムイオン二次電池１においては、ガスケ
ット２２が、その基部２２ａの上面部を折曲された外周
縁部２４によって押しつぶされることで、外周部を外周
縁部２４と受け部２３とに跨る内面に密着される。リチ
ウムイオン二次電池１においては、このようにして電池
缶２がその開口部３を、ガスケット２２を介して正極端
子構体４によって全周に亘って封口される。ガスケット
２２は、自然状態での基部２２ａの厚みが約０．６ｍｍ
とされ、上述したかしめ処理が施されることによって厚
みが約０．４ｍｍ以下となる。In the lithium ion secondary battery 1, as shown in FIG. 3, the outer peripheral portion 24 of the battery can 2 forming the opening 3 is crimped inward over the entire circumference. . In the lithium ion secondary battery 1, the gasket 22 is crushed by the bent outer peripheral edge 24 on the upper surface of the base 22 a, so that the outer peripheral portion is formed on the inner surface straddling the outer peripheral edge 24 and the receiving portion 23. Be adhered. In the lithium ion secondary battery 1, the opening 3 of the battery can 2 is thus sealed over the entire circumference by the positive electrode terminal structure 4 via the gasket 22. In the gasket 22, the thickness of the base 22a in the natural state is about 0.6 mm.
The thickness is reduced to about 0.4 mm or less by performing the caulking process described above.

【００３１】ところで、リチウムイオン二次電池１にお
いては、上述した非水電解液８の注入操作に際して、図
２に示すように電池缶２の開口部３に形成した受け部２
３の内周部に非水電解液８の一部８ａが付着残留する。
このため、リチウムイオン二次電池１においては、非水
電解液８の注入操作後に、同図に示すように吸引ヘッド
２５が開口部３から差し込まれて残留非水電解液８ａを
吸引除去する処理工程が施される。By the way, in the lithium ion secondary battery 1, at the time of the above-described operation of injecting the non-aqueous electrolyte 8, the receiving portion 2 formed in the opening 3 of the battery can 2 as shown in FIG.
A portion 8a of the non-aqueous electrolyte 8 adheres to the inner peripheral portion of 3 and remains.
For this reason, in the lithium ion secondary battery 1, after the operation of injecting the non-aqueous electrolyte 8, the suction head 25 is inserted through the opening 3 to suck and remove the remaining non-aqueous electrolyte 8a as shown in FIG. A process is performed.

【００３２】吸引ヘッド２５は、開口部３の内径よりも
やや小径とされ、詳細を省略するがその外周部に図示し
ない多数個の吸引孔が形成されている。吸引ヘッド２５
は、吸引パイプ２６を介して図示しないバキュームに接
続されており、このバキュームが駆動されることによっ
て吸引孔に生じる吸引力により受け部２３の内周部に付
着した残留非水電解液８ａを吸引除去する。リチウムイ
オン二次電池１においては、この残留非水電解液８ａの
除去処理工程後に上述した正極端子構体４の組付け工程
とかしめ封口工程とが施される。The suction head 25 has a diameter slightly smaller than the inner diameter of the opening 3 and has a plurality of suction holes (not shown) formed in the outer periphery thereof, although not shown in detail. Suction head 25
Is connected to a vacuum (not shown) via a suction pipe 26, and the residual non-aqueous electrolyte 8 a attached to the inner peripheral portion of the receiving portion 23 is sucked by a suction force generated in a suction hole by driving the vacuum. Remove. In the lithium ion secondary battery 1, the above-described assembling step of the positive electrode terminal assembly 4 and the swaging step are performed after the step of removing the residual nonaqueous electrolyte 8a.

【００３３】残留非水電解液８ａの除去処理は、電池缶
２の開口部３から完全に除去することが好ましいが、後
述するように完全に除去する必要も無い。除去処理は、
電解液８の漏洩にある程度の許容量があり、例えば１８
６５０サイズの円筒型リチウムイオン二次電池の場合に
は最大で３０ｍｇである。したがって、リチウムイオン
二次電池１においては、上述した残留非水電解液８ａの
除去処理において、１ｃｍあたりで６ｍｇ以下の精度で
その処理が行われる。It is preferable to completely remove the residual nonaqueous electrolyte 8a from the opening 3 of the battery can 2, but it is not necessary to completely remove the remaining nonaqueous electrolyte 8a as described later. The removal process is
There is a certain amount of leakage of the electrolyte 8, for example, 18
In the case of a 650-size cylindrical lithium ion secondary battery, the maximum amount is 30 mg. Therefore, in the lithium ion secondary battery 1, in the above-described removal processing of the residual nonaqueous electrolyte 8a, the processing is performed with an accuracy of 6 mg or less per cm.

【００３４】リチウムイオン二次電池１においては、上
述したようにバキュームに接続された吸引ヘッド２５に
よって残留非水電解液８ａを吸引除去するようにした
が、かかる方法に限定されるものでは無いことは勿論で
ある。吸引ヘッド２５については、バキュームに接続さ
れた吸引パイプであってもよい。また、残留非水電解液
８ａの除去処理は、例えばワイパータオル等の吸水性を
有する布や紙を用いた払拭方法によって行うようにして
もよい。ワイパータオルは、例えば開口部３の内径より
も小径とされた払拭ヘッドに交換自在に装着し、開口部
３の内周面に沿って回転動作させるようにする。除去方
法については、エアーブローにより残留非水電解液８ａ
を吹き飛ばすことによって行うようにしてもよい。エア
ーブローによる除去方法は、例えば開口部３の内径より
も小径とされたノズルヘッドからエアーを吹き付けるこ
とによって、残留非水電解液８ａを吹き飛ばして除去す
る。In the lithium ion secondary battery 1, as described above, the residual nonaqueous electrolyte 8a is suctioned and removed by the suction head 25 connected to the vacuum, but the present invention is not limited to such a method. Of course. The suction head 25 may be a suction pipe connected to a vacuum. Further, the removal treatment of the residual nonaqueous electrolyte 8a may be performed by a wiping method using a water-absorbing cloth or paper such as a wiper towel. The wiper towel is exchangeably mounted on, for example, a wiping head having a smaller diameter than the inner diameter of the opening 3, and is rotated along the inner peripheral surface of the opening 3. Regarding the removal method, the residual non-aqueous electrolyte 8a was blown by air blow.
May be blown off. The removal method by air blow blows and removes the remaining nonaqueous electrolyte 8a by, for example, blowing air from a nozzle head having a smaller diameter than the inside diameter of the opening 3.

【００３５】次に、１８６５０サイズの円筒型リチウム
イオン二次電池について、本発明を適用した実施例と比
較例とをそれぞれ製作して、漏液試験を実施した。漏液
試験は、−２０℃乃至６０℃の温度変化を１０サイクル
行う温度衝撃を加えた後に電池缶２のカシメ部２４から
の漏液量を求めることによって行った。なお、電池缶２
は、ガスケット２２が嵌合される部位の内周長が約５０
ｍｍである。Next, with respect to a cylindrical lithium ion secondary battery of 18650 size, an example to which the present invention was applied and a comparative example were respectively manufactured, and a liquid leakage test was performed. The liquid leakage test was performed by determining the amount of liquid leakage from the crimped portion 24 of the battery can 2 after applying a temperature shock of 10 cycles of a temperature change of −20 ° C. to 60 ° C. The battery can 2
Has an inner peripheral length of about 50 at which the gasket 22 is fitted.
mm.

【００３６】[0036]

【実施例１】厚みが０．３０ｍｍの電池缶２に非水電解
液８を注入した後に、上述した吸引ヘッド２５によって
開口部３の内面に付着した残留非水電解液８ａをほぼ完
全に除去する除去処理を施す。この電池缶２に対して、
内面とのクリアランスが０．０５ｍｍのガスケット２２
を用いた正極端子構体４を組み付け、ガスケット２２に
対して圧縮率５０％のかしめ処理を施してサンプル電池
ａ乃至ｅを製作した。これらサンプル電池ａ乃至ｅは、
上述した漏液試験を施した結果、カシメ部２４からの漏
液量が０であった。Example 1 After a non-aqueous electrolyte 8 was injected into a battery can 2 having a thickness of 0.30 mm, a residual non-aqueous electrolyte 8a attached to the inner surface of the opening 3 was almost completely removed by the suction head 25 described above. Is performed. For this battery can 2,
Gasket 22 with a clearance of 0.05 mm from the inner surface
Was assembled, and caulking was performed on the gasket 22 at a compression ratio of 50% to produce sample batteries a to e. These sample batteries a to e
As a result of the above-described liquid leakage test, the amount of liquid leakage from the caulking portion 24 was 0.

【００３７】[0037]

【実施例２】上述した実施例１と同様に吸引ヘッド２５
によって、電極缶２の開口部３の内面から付着した残留
非水電解液８ａをほぼ完全に除去した後に、計量した１
５ｍｇの非水電解液８をスポイトによって開口部３の内
面に均一に付着させた。この電池缶２に対して、内面と
のクリアランスが０．０５ｍｍのガスケット２２を用い
た正極端子構体４を組み付け、ガスケット２２に対して
圧縮率５０％のかしめ処理を施してサンプル電池ａ乃至
ｅを製作した。これらサンプル電池ａ乃至ｅに対して上
述した漏液試験を施した結果、サンプル電池ｅにおいて
かしめ部２４から３ｍｇの漏洩量が計量されたが、その
他のサンプル電池ａ乃至ｄの漏洩量は０であった。[Embodiment 2] As in Embodiment 1 described above, the suction head 25 is used.
After the residual nonaqueous electrolyte 8a attached from the inner surface of the opening 3 of the electrode can 2 was almost completely removed,
5 mg of the non-aqueous electrolyte 8 was uniformly attached to the inner surface of the opening 3 with a dropper. The positive electrode terminal structure 4 using the gasket 22 having a clearance of 0.05 mm from the inner surface is assembled to the battery can 2, and the gasket 22 is subjected to a caulking process at a compression ratio of 50% to obtain sample batteries a to e. Made. As a result of performing the above-described liquid leakage test on these sample batteries a to e, a leakage amount of 3 mg was measured from the caulking portion 24 in the sample battery e, but the leakage amounts of the other sample batteries a to d were 0. there were.

【００３８】[0038]

【実施例３】上述した実施例１と同様に吸引ヘッド２５
によって、電極缶２の開口部３の内面から付着した残留
非水電解液８ａをほぼ完全に除去した後に、計量した３
０ｍｇの非水電解液８をスポイトによって開口部３の内
面に均一に付着させた。この電池缶２に対して、内面と
のクリアランスが０．０５ｍｍのガスケット２２を用い
た正極端子構体４を組み付け、ガスケット２２に対して
圧縮率５０％のかしめ処理を施してサンプル電池ａ乃至
ｅを製作した。これらサンプル電池ａ乃至ｅに対して上
述した漏液試験を施した結果、サンプル電池ａにおいて
かしめ部２４から１２ｍｇの漏洩量が、サンプル電池ｃ
において８ｍｇの漏洩量がそれぞれ計量されたが、その
他のサンプル電池ａ乃至ｄの漏洩量は０であった。[Embodiment 3] As in Embodiment 1 described above, the suction head 25 is used.
After the residual nonaqueous electrolyte 8a attached from the inner surface of the opening 3 of the electrode can 2 was almost completely removed,
0 mg of the non-aqueous electrolyte 8 was uniformly attached to the inner surface of the opening 3 with a dropper. The positive electrode terminal structure 4 using the gasket 22 having a clearance of 0.05 mm from the inner surface is assembled to the battery can 2, and the gasket 22 is subjected to a caulking process at a compression ratio of 50% to obtain sample batteries a to e. Made. As a result of performing the above-described liquid leakage test on these sample batteries a to e, the amount of leakage of 12 mg from the caulking portion 24 in the sample battery a was
, The leakage amounts of 8 mg were measured respectively, but the leakage amounts of the other sample batteries a to d were 0.

【００３９】[0039]

【比較例１】上述した実施例３と同様にして製作する
が、電極缶２の内面に計量した４５ｍｇの非水電解液８
ををスポイトによって開口部３の内面に均一に付着させ
たサンプル電池ａ乃至ｅを製作した。これらサンプル電
池ａ乃至ｅに対して上述した漏液試験を施した結果、か
しめ部２４からの漏洩量は、サンプル電池ｃにおいて０
ｍｇではあったが、サンプル電池ａにおいて２４ｍｇ、
サンプル電池ｂにおいて２２ｍｇ、サンプル電池ｄにお
いて１４ｍｇ、サンプル電池ｅにおいて１８ｍｇが計量
された。Comparative Example 1 A non-aqueous electrolyte 8 of 45 mg weighed on the inner surface of the electrode can 2 was manufactured in the same manner as in Example 3 described above.
Were uniformly attached to the inner surface of the opening 3 with a dropper to produce sample batteries a to e. As a result of performing the above-described liquid leakage test on these sample batteries a to e, the amount of leakage from the caulking portion 24 was 0% in the sample battery c.
mg, but 24 mg in the sample battery a,
22 mg was weighed for sample battery b, 14 mg for sample battery d, and 18 mg for sample battery e.

【００４０】[0040]

【比較例２】上述した実施例３と同様にして製作する
が、電極缶２の内面に計量した６０ｍｇの非水電解液８
ををスポイトによって開口部３の内面に均一に付着させ
たサンプル電池ａ乃至ｅを製作した。これらサンプル電
池ａ乃至ｅに対して上述した漏液試験を施した結果、か
しめ部２４からの漏洩量は、それぞれサンプル電池ａに
おいて２８ｍｇ、サンプル電池ｂにおいて３２ｍｇ、サ
ンプル電池ｃにおいて４１ｍｇ、サンプル電池ｄにおい
て３５ｍｇ、サンプル電池ｅにおいて２６ｍｇが計量さ
れた。Comparative Example 2 A non-aqueous electrolyte 8 of 60 mg weighed on the inner surface of the electrode can 2 was manufactured in the same manner as in Example 3 described above.
Were uniformly attached to the inner surface of the opening 3 with a dropper to produce sample batteries a to e. As a result of performing the above-described liquid leakage test on these sample batteries a to e, the amount of leakage from the caulking portion 24 was 28 mg for the sample battery a, 32 mg for the sample battery b, 41 mg for the sample battery c, and 41 mg for the sample battery d, respectively. Weighed 35 mg, and 26 mg in the sample battery e.

【００４１】[0041]

【比較例３】上述した比較例１と同様に、電極缶２の内
面に計量した４５ｍｇの非水電解液８をスポイトによっ
て開口部３の内面に均一に付着させるが、内面とのクリ
アランスが０．０２ｍｍときつめのガスケット２２を用
いた正極端子構体４を組み付け、ガスケット２２に対し
て圧縮率５０％のかしめ処理を施してサンプル電池ａ乃
至ｅを製作した。これらサンプル電池ａ乃至ｅに対して
上述した漏液試験を施した結果、かしめ部２４からの漏
洩量は、サンプル電池ｃにおいて０ｍｇではあったが、
それぞれサンプル電池ａにおいて１７ｍｇ、サンプル電
池ｂにおいて２４ｍｇ、サンプル電池ｄにおいて１６ｍ
ｇ、サンプル電池ｅにおいて２６ｍｇが計量された。Comparative Example 3 As in Comparative Example 1, 45 mg of the weighed non-aqueous electrolyte 8 was uniformly adhered to the inner surface of the opening 3 by a dropper on the inner surface of the electrode can 2, but the clearance with the inner surface was reduced to 0. The positive electrode terminal structure 4 using the gasket 22 having a thickness of 0.02 mm was assembled, and the gasket 22 was subjected to caulking at a compression ratio of 50% to produce sample batteries a to e. As a result of performing the above-described liquid leakage test on these sample batteries a to e, the amount of leakage from the caulking part 24 was 0 mg in the sample battery c,
17 mg for sample battery a, 24 mg for sample battery b, and 16 m for sample battery d
g, 26 mg was weighed in the sample battery e.

【００４２】[0042]

【比較例４】上述した比較例１と同様に、電極缶２の内
面に計量した４５ｍｇの非水電解液８ををスポイトによ
って開口部３の内面に均一に付着させるが、内面とのク
リアランスが０．０５ｍｍのガスケット２２に対して圧
縮率が７０％と強いかしめ処理を施してサンプル電池ａ
乃至ｅを製作した。これらサンプル電池ａ乃至ｅに対し
て上述した漏液試験を施した結果、かしめ部２４からの
漏洩量は、サンプル電池ｂにおいて０ｍｇではあった
が、それぞれサンプル電池ａにおいて１４ｍｇ、サンプ
ル電池ｃにおいて２９ｍｇ、サンプル電池ｄにおいて２
１ｍｇ、サンプル電池ｅにおいて２０ｍｇが計量され
た。Comparative Example 4 In the same manner as in Comparative Example 1 described above, a weighed 45 mg of the nonaqueous electrolytic solution 8 was uniformly attached to the inner surface of the opening 3 with a dropper on the inner surface of the electrode can 2, but the clearance with the inner surface was reduced. The sample battery a was subjected to a strong caulking treatment with a compression ratio of 70% for the gasket 22 of 0.05 mm to
To e. As a result of performing the above-described liquid leakage test on the sample batteries a to e, the amount of leakage from the caulking portion 24 was 0 mg in the sample battery b, but was 14 mg in the sample battery a and 29 mg in the sample battery c. , 2 in sample battery d
1 mg and 20 mg were weighed in the sample battery e.

【００４３】[0043]

【比較例５】厚みが０．５０ｍｍと大きな板厚の電池缶
２に非水電解液８を注入した後に、上述した吸引ヘッド
２５によって開口部３の内面に付着した残留非水電解液
８ａをほぼ完全に除去する除去処理を施した後に、計量
した４５ｍｇの非水電解液８をスポイトによって開口部
３の内面に均一に付着させた。この電池缶２に対して、
内面とのクリアランスが０．０５ｍｍのガスケット２２
を用いた正極端子構体４を組み付け、ガスケット２２に
対して圧縮率５０％のかしめ処理を施してサンプル電池
ａ乃至ｅを製作した。これらサンプル電池ａ乃至ｅに対
して上述した漏液試験を施した結果、かしめ部２４から
の漏洩量は、サンプル電池ｄにおいて０ｍｇではあった
が、それぞれサンプル電池ａにおいて２２ｍｇ、サンプ
ル電池ｂにおいて１２ｍｇ、サンプル電池ｃにおいて１
８ｍｇ、サンプル電池ｅにおいて２９ｍｇが計量され
た。Comparative Example 5 After the non-aqueous electrolyte 8 was injected into the battery can 2 having a large thickness of 0.50 mm, the residual non-aqueous electrolyte 8a adhered to the inner surface of the opening 3 by the suction head 25 was removed. After performing the removal treatment for removing almost completely, the weighed 45 mg of the non-aqueous electrolyte 8 was uniformly attached to the inner surface of the opening 3 with a dropper. For this battery can 2,
Gasket 22 with a clearance of 0.05 mm from the inner surface
Was assembled, and caulking was performed on the gasket 22 at a compression ratio of 50% to produce sample batteries a to e. As a result of performing the above-described liquid leakage test on the sample batteries a to e, the amount of leakage from the caulking portion 24 was 0 mg in the sample battery d, but was 22 mg in the sample battery a and 12 mg in the sample battery b, respectively. , 1 in sample battery c
8 mg and 29 mg were weighed in the sample battery e.

【００４４】上述した各実施例と比較例の仕様、及び漏
液試験の結果の一覧は、次の表１に示すとおりである。The specifications of the above-described examples and comparative examples and a list of the results of the liquid leakage test are as shown in Table 1 below.

【００４５】[0045]

【表１】 [Table 1]

【００４６】リチウムイオン二次電池１においては、上
述した各実施例と比較例の仕様及び漏液試験の結果から
明らかなように、かしめ部２４からの非水電解液８の漏
液発生が、電池缶２とガスケット２２とのクリアランス
やガスケット２２に対するかしめ強度に依存せずにかし
め部２４の内面に付着した残留非水電解液８ａの付着量
に起因することが明らかである。したがって、リチウム
イオン二次電池１においては、非水電解液８の注入後に
電池缶２に対してそのかしめ部２４の内面に付着した残
留非水電解液８ａを除去する処理を施すことによって、
非水電解液８の漏液発生が確実に低減或いは防止され
る。勿論、リチウムイオン二次電池１においては、かか
る温度変化に伴う非水電解液８の漏液発生ばかりでな
く、落下衝撃や高温条件下における保存等に際しても同
様の作用効果が奏せられる。In the lithium ion secondary battery 1, as is apparent from the specifications and the results of the liquid leakage test of each of the above-described examples and comparative examples, the leakage of the nonaqueous electrolyte 8 from the caulking part 24 caused It is clear that the difference is due to the amount of the residual nonaqueous electrolyte 8a attached to the inner surface of the caulked portion 24 without depending on the clearance between the battery can 2 and the gasket 22 and the caulking strength for the gasket 22. Therefore, in the lithium ion secondary battery 1, after the non-aqueous electrolyte 8 is injected, the battery can 2 is subjected to a process of removing the remaining non-aqueous electrolyte 8 a adhered to the inner surface of the caulking portion 24.
Leakage of the nonaqueous electrolyte 8 is reliably reduced or prevented. Of course, in the lithium ion secondary battery 1, not only the leakage of the nonaqueous electrolyte solution 8 due to such a temperature change, but also the same operation and effect can be exerted at the time of drop impact and storage under high temperature conditions.

【００４７】図４は、電極間２のカシメ部２４の内面に
付着残留した残留非水電解液８ａの単位長さ当たりの付
着量（ｍｇ／ｃｍ）を横軸とし、これに対応したカシメ
部２４からの漏液量（ｍｇ）を縦軸として示した、非水
電解液８の残留量−漏液量特性図である。リチウムイオ
ン二次電池１においては、上述したように非水電解液８
の漏液量が最大漏液量が３０ｍｇ程度まで許容される
が、１５ｍｇ程度までに抑制することが好ましい。リチ
ウムイオン二次電池１は、種々の外形仕様を有するもの
が提供されているが、同図から明らかなようにカシメ部
２４の内周面における残留量が内周長１０ｍｍ当たりで
６ｍｇ以下となるように残留非水電解液８ａの除去処理
を施せばよい。FIG. 4 shows the amount (mg / cm) of the remaining nonaqueous electrolytic solution 8a adhering and remaining on the inner surface of the caulking portion 24 between the electrodes 2 per unit length on the horizontal axis, and the caulking portion corresponding thereto. FIG. 6 is a characteristic diagram of the residual amount of the nonaqueous electrolyte 8 versus the amount of liquid leakage, in which the amount of liquid leakage (mg) from 24 is shown on the vertical axis. In the lithium ion secondary battery 1, as described above, the nonaqueous electrolyte 8
Although the maximum amount of liquid leakage is allowed up to about 30 mg, it is preferable to suppress it to about 15 mg. As the lithium ion secondary battery 1, one having various external specifications is provided. As is apparent from the figure, the residual amount on the inner peripheral surface of the caulking portion 24 is 6 mg or less per 10 mm of the inner peripheral length. The removal treatment of the residual nonaqueous electrolyte 8a may be performed as described above.

【００４８】なお、上述した実施の形態においては、円
筒型リチウムイオン二次電池１について説明したが、本
発明は、例えば角型リチウムイオン二次電池にも適用さ
れることは勿論である。また、本発明は、リチウムイオ
ン二次電池ばかりでなく、その他の二次電池や一次電池
にも適用される。In the above-described embodiment, the cylindrical lithium ion secondary battery 1 has been described, but the present invention is, of course, applicable to, for example, a prismatic lithium ion secondary battery. Further, the present invention is applied not only to lithium ion secondary batteries, but also to other secondary batteries and primary batteries.

【００４９】[0049]

【発明の効果】以上詳細に説明したように、本発明にか
かる非水電解液電池の製造方法によれば、非水電解液の
注入後に電池缶のガスケットが嵌合される内周部位に付
着した非水電解液を除去する非水電解液除去工程を施す
ことから、電池缶の厚みやかしめ強度を大きくする等の
構成各部材や工程仕様を変更することなく、温度変化や
落下衝撃或いは高温保管等にもかかわらずかしめ部位か
らの非水電解液の漏液が確実に防止され或いは基準値内
までに抑制された信頼性の高い非水電解液電池が低コス
トでかつ高生産性を以って製造される。As described above in detail, according to the method for manufacturing a nonaqueous electrolyte battery according to the present invention, the nonaqueous electrolyte adheres to the inner peripheral portion of the battery can where the gasket is fitted after the nonaqueous electrolyte is injected. Since the non-aqueous electrolyte removal step of removing the non-aqueous electrolyte that has been performed is performed, temperature changes, drop impacts, or high temperatures can be achieved without changing the components and process specifications such as increasing the thickness and caulking strength of the battery can. A highly reliable non-aqueous electrolyte battery in which leakage of the non-aqueous electrolyte from the caulked portion is reliably prevented or suppressed to within the standard value despite storage, etc., at low cost and high productivity It is manufactured.

【図面の簡単な説明】[Brief description of the drawings]

【図１】本発明によって製造された円筒型リチウムイオ
ン二次電池の縦断面図である。FIG. 1 is a longitudinal sectional view of a cylindrical lithium ion secondary battery manufactured according to the present invention.

【図２】同円筒型リチウムイオン二次電池において、カ
シメ部の内面に付着した残留非水電解液の除去処理を説
明する要部縦断面図である。FIG. 2 is a longitudinal sectional view of an essential part for explaining a process of removing a residual non-aqueous electrolyte adhering to an inner surface of a caulked portion in the cylindrical lithium ion secondary battery.

【図３】同円筒型リチウムイオン二次電池において、電
池缶の開口部に正極端子構体を組み付けてかしめ封口を
施した状態を説明する要部縦断面図である。FIG. 3 is a vertical cross-sectional view of a main part of the cylindrical lithium ion secondary battery, illustrating a state in which a positive electrode terminal assembly is assembled to an opening of a battery can and swaged and sealed;

【図４】カシメ部の内面に付着した残留非水電解液の残
留量と漏液量の特性図である。FIG. 4 is a characteristic diagram of a residual amount and a leakage amount of a residual non-aqueous electrolyte adhered to an inner surface of a caulking portion.

【図５】従来の円筒型リチウムイオン二次電池の要部縦
断面図である。FIG. 5 is a longitudinal sectional view of a main part of a conventional cylindrical lithium ion secondary battery.

【符号の説明】[Explanation of symbols]

１ リチウムイオン二次電池、２ 電池缶、３ 開口
部、４ 正極端子構体、５ 正極材、６ 負極材、７
セパレータ、８ 非水電解液、２２ ガスケット、２３
正極端子構体受け部、２４ カシメ部、２５ 吸引ヘ
ッドReference Signs List 1 lithium ion secondary battery, 2 battery can, 3 opening, 4 positive electrode terminal structure, 5 positive electrode material, 6 negative electrode material, 7
Separator, 8 Non-aqueous electrolyte, 22 Gasket, 23
Positive terminal assembly receiving section, 24 caulking section, 25 suction head

Claims (4)

【特許請求の範囲】[Claims] 【請求項１】 電極缶の内部に、正極材と負極材とをセ
パレータを介して重ね合わせてなる発電体と非水電解液
とを充填した後に、上記電極缶の開口部にガスケットを
介して電極端子部材をかしめ封口してなる非水電解液電
池の製造方法において、 上記非水電解液の注入工程後に、上記電極缶の開口部に
対して、上記ガスケットが嵌合される内周部位に付着し
た上記非水電解液を除去する非水電解液除去工程を施す
ことを特徴とする非水電解液電池の製造方法。After filling the inside of an electrode can with a non-aqueous electrolyte and a power generator obtained by laminating a positive electrode material and a negative electrode material with a separator interposed therebetween, a gasket is inserted into the opening of the electrode can through a gasket. In the method for manufacturing a non-aqueous electrolyte battery in which the electrode terminal member is swaged and sealed, after the step of injecting the non-aqueous electrolyte, an opening portion of the electrode can is provided at an inner peripheral portion where the gasket is fitted. A method for manufacturing a non-aqueous electrolyte battery, comprising performing a non-aqueous electrolyte removal step of removing the attached non-aqueous electrolyte. 【請求項２】 上記非水電解液除去工程は、上記非水電
解液を上記電極缶の開口部からその内周長１ｃｍ当たり
６ｍｇ以下まで除去することを特徴とする請求項１に記
載の非水電解液電池の製造方法。2. The non-aqueous electrolytic solution removing step according to claim 1, wherein the non-aqueous electrolytic solution is removed from the opening of the electrode can to 6 mg or less per 1 cm of an inner peripheral length thereof. A method for producing a water electrolyte battery. 【請求項３】 上記非水電解液除去工程は、上記非水電
解液を拭取り法によって除去することを特徴とする請求
項１に記載の非水電解液電池の製造方法。3. The method for producing a non-aqueous electrolyte battery according to claim 1, wherein in the non-aqueous electrolyte removing step, the non-aqueous electrolyte is removed by a wiping method. 【請求項４】 上記非水電解液除去工程は、上記非水電
解液を吸引法或いは吹飛し法によって除去することを特
徴とする請求項１に記載の非水電解液電池の製造方法。4. The method for manufacturing a non-aqueous electrolyte battery according to claim 1, wherein in the non-aqueous electrolyte removing step, the non-aqueous electrolyte is removed by a suction method or a blow-off method.
JP28699899A 1999-10-07 1999-10-07 Manufacturing method of nonaqueous electrolytic battery Pending JP2001110452A (en)

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Application Number Priority Date Filing Date Title
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JP2001110452A5 JP2001110452A5 (en) 2006-03-30

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61171061A (en) * 1985-01-24 1986-08-01 Japan Storage Battery Co Ltd Method of pouring electrolyte into cylindrical battery after it is evacuated
JPS6467879A (en) * 1987-09-08 1989-03-14 Matsushita Electric Ind Co Ltd Nonaqueous electrolyte secondary cell
JPH0594816A (en) * 1991-09-30 1993-04-16 Asahi Chem Ind Co Ltd Impregnating method for battery
JPH08130004A (en) * 1994-09-05 1996-05-21 Fuji Elelctrochem Co Ltd Decompression filling method for cylindrical battery and equipment
JPH10214606A (en) * 1996-11-28 1998-08-11 Sanyo Electric Co Ltd Thin type battery of laminated armor body
JPH1173958A (en) * 1997-06-18 1999-03-16 Sony Corp Manufacture of positive electrode active material

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61171061A (en) * 1985-01-24 1986-08-01 Japan Storage Battery Co Ltd Method of pouring electrolyte into cylindrical battery after it is evacuated
JPS6467879A (en) * 1987-09-08 1989-03-14 Matsushita Electric Ind Co Ltd Nonaqueous electrolyte secondary cell
JPH0594816A (en) * 1991-09-30 1993-04-16 Asahi Chem Ind Co Ltd Impregnating method for battery
JPH08130004A (en) * 1994-09-05 1996-05-21 Fuji Elelctrochem Co Ltd Decompression filling method for cylindrical battery and equipment
JPH10214606A (en) * 1996-11-28 1998-08-11 Sanyo Electric Co Ltd Thin type battery of laminated armor body
JPH1173958A (en) * 1997-06-18 1999-03-16 Sony Corp Manufacture of positive electrode active material

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