JP2002324584A - Flat nonaqueous electrolyte secondary battery with lead terminal - Google Patents
Flat nonaqueous electrolyte secondary battery with lead terminalInfo
- Publication number
- JP2002324584A JP2002324584A JP2001125780A JP2001125780A JP2002324584A JP 2002324584 A JP2002324584 A JP 2002324584A JP 2001125780 A JP2001125780 A JP 2001125780A JP 2001125780 A JP2001125780 A JP 2001125780A JP 2002324584 A JP2002324584 A JP 2002324584A
- Authority
- JP
- Japan
- Prior art keywords
- lead terminal
- electrode
- negative electrode
- battery
- electrolyte secondary
- 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.)
- Granted
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
-
- 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
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は扁平形非水電解質二
次電池に係わり、特に、リード端子を電極ケース面に溶
接したリード端子付扁平形非水電解質二次電池に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat non-aqueous electrolyte secondary battery, and more particularly to a flat non-aqueous electrolyte secondary battery with lead terminals in which lead terminals are welded to an electrode case surface.
【０００２】[0002]
【従来の技術】正極作用物質にＭｎＯ2やＶ2Ｏ5などの
金属酸化物、あるいはフッ化黒鉛などの無機化合物、あ
るいはポリアニリンやポリアセン構造体などの有機化合
物を用い、負極に金属リチウム、あるいはリチウム合
金、あるいはポリアセン構造体などの有機化合物、ある
いはリチウムを吸蔵、放出可能な炭素質材料、あるいは
チタン酸リチウムやリチウム含有珪素酸化物のような酸
化物を用い、電解質にプロピレンカーボネート、エチレ
ンカーボネート、ブチレンカーボネート、ジエチルカー
ボネート、ジメチルカーボネート、メチルエチルカーボ
ネート、ジメトキシエタン、γ−ブチルラクトンなどの
非水溶媒にＬｉＣｌＯ4、ＬｉＰＦ6、ＬｉＢＦ4、Ｌｉ
ＣＦ3ＳＯ3、ＬｉＮ（ＣＦ3ＳＯ2）2、ＬｉＮ（Ｃ2Ｆ5
ＳＯ2）2などの支持塩を溶解した非水電解質を用いたコ
イン形やボタン形の扁平形非水電解質二次電池は、既に
商品化されており、放電電流が数〜数十μＡ程度の軽負
荷で放電が行われるＳＲＡＭやＲＴＣのバックアップ用
電源や電池交換不要腕時計の主電源といった用途に適用
されている。 2. Description of the Related Art A metal oxide such as MnO 2 or V 2 O 5 , an inorganic compound such as fluorinated graphite, or an organic compound such as polyaniline or a polyacene structure is used as a positive electrode active material. Lithium alloy, or an organic compound such as a polyacene structure, or a carbonaceous material capable of occluding and releasing lithium, or an oxide such as lithium titanate or lithium-containing silicon oxide, and propylene carbonate, ethylene carbonate as an electrolyte, LiClO 4 , LiPF 6 , LiBF 4 , LiBF 4 , LiClO 4 , LiPF 6 , LiBF 4 , Lithium carbonate, diethyl carbonate, dimethyl carbonate, methyl ethyl carbonate, dimethoxyethane, γ-butyl lactone
CF 3 SO 3 , LiN (CF 3 SO 2 ) 2 , LiN (C 2 F 5
A coin-shaped or button-shaped flat non-aqueous electrolyte secondary battery using a non-aqueous electrolyte in which a supporting salt such as SO 2 ) 2 is dissolved has already been commercialized, and a discharge current of about several to several tens μA has been obtained. It is applied to applications such as a backup power supply for SRAMs and RTCs that discharge at light loads, and a main power supply for wristwatches that do not require battery replacement.
【０００３】これらコイン形やボタン形の扁平形非水電
解質二次電池は、主用途が軽負荷での放電のため、図６
に示す構造をしており、正極１４、及び負極１５は、ペ
レット形状をしたものが一般的である。[0003] These coin-shaped and button-shaped flat nonaqueous electrolyte secondary batteries are mainly used for light-load discharge, and therefore are not shown in FIG.
The positive electrode 14 and the negative electrode 15 are generally in the form of pellets.
【０００４】しかし、図６に示すような従来の扁平形非
水電解質二次電池では、負極端子を兼ねる金属製の負極
ケース５と、正極端子を兼ねる金属製の正極ケース１
が、絶縁ガスケット６を介し嵌合され、さらに正極ケー
ス１または負極ケース５が加締め加工により加締められ
た封口構造を有し、その内部に少なくとも正極１４、セ
パレータ３、負極１５を含む発電要素と、非水電解質が
内包されているが、正極１４、及び負極１５がペレット
形状をしているため、リード端子を溶接する際、溶接に
十分な熱を発生させても、正極または負極がペレット形
状のため正極１４及び負極１５の間に設けられたセパレ
ータ３まで発生した熱が到達せず、セパレータ３の穴あ
き、収縮などの問題は起こらなかった。However, in the conventional flat nonaqueous electrolyte secondary battery as shown in FIG. 6, a metal negative electrode case 5 also serving as a negative electrode terminal and a metal positive electrode case 1 also serving as a positive electrode terminal are provided.
Have a sealing structure in which the positive electrode case 1 or the negative electrode case 5 is crimped by a crimping process, and include at least the positive electrode 14, the separator 3, and the negative electrode 15 therein. And the non-aqueous electrolyte is included, but since the positive electrode 14 and the negative electrode 15 are in the form of pellets, when welding the lead terminals, even if sufficient heat is generated for welding, the positive electrode or the negative electrode is Due to the shape, the generated heat did not reach the separator 3 provided between the positive electrode 14 and the negative electrode 15, and no problems such as perforation and shrinkage of the separator 3 occurred.
【０００５】一方、携帯電話やＰＤＡなどの小型情報端
末を中心に使用機器の小型化が加速しており、主電源で
ある二次電池についても小型化を図ることが要求されて
いる。このような要求に対し、特開２０００−６８１６
０号や、特開２００１−６８１４３号に示すような負極
端子を兼ねる金属製の負極ケースと、正極端子を兼ねる
金属製の正極ケースが、絶縁ガスケットを介し嵌合さ
れ、さらに正極ケースまたは負極ケースが加締め加工に
より加締められた封口構造を有し、その内部に少なくと
も正極、セパレータ、負極を含む発電要素と、非水電解
質を内包した扁平形非水電解質二次電池において、扁平
形電池の扁平面に垂直な方向の断面を見た場合に、少な
くとも３面以上の正極と負極がセパレータを介して対向
している正負極対向面を有した電極群が収納され、か
つ、電極群内の正負極対向面積の総和が絶縁ガスケット
の開口面積よりも大きくする構造の扁平形非水電解質二
次電池が小型化の要求を満たす電池として開発されてい
る。[0005] On the other hand, the miniaturization of devices used has been accelerated, especially for small information terminals such as cellular phones and PDAs, and there is a demand for miniaturization of secondary batteries as a main power supply. In response to such a request, JP-A-2000-6816
No. 0 and a metal negative electrode case also serving as a negative electrode terminal as shown in JP-A-2001-68143, and a metal positive electrode case also serving as a positive electrode terminal are fitted via an insulating gasket. Has a sealing structure caulked by caulking, at least a positive electrode, a separator, a power generation element including a negative electrode therein, and a flat non-aqueous electrolyte secondary battery including a non-aqueous electrolyte. When viewing a cross section in a direction perpendicular to the flat surface, an electrode group having a positive / negative electrode facing surface in which at least three or more positive electrodes and a negative electrode face each other via a separator is housed, and, in the electrode group, A flat nonaqueous electrolyte secondary battery having a structure in which the sum of the positive and negative electrode facing areas is larger than the opening area of the insulating gasket has been developed as a battery that meets the demand for miniaturization.
【０００６】ところで、これらの扁平形非水電解質二次
電池を機器に組み込む場合、その多くは正極ケース及び
負極ケースの外側にリード端子を抵抗溶接にて溶接し、
端子部と機器とをはんだ付けして組み込むのが一般的で
ある。しかし、前述したように正極、負極、セパレータ
からなる合剤層の厚さが１．０ｍｍ以下である電極群を
積層もしくは捲回し、電池内に内包する扁平形非水電解
質二次電池では、一枚の電極の厚さが１ｍｍ以下の薄い
正負極電極と０．５ｍｍ以下のポリエチレン、ポリプロ
ピレン製などの薄膜セパレータを介して、積層または捲
回された電極群を直接、正極及び負極ケースに接触さ
せ、ケースと電極の集電を取っている。この電池系にお
いて抵抗溶接を行うために、ケースに３００〜４５０Ｖ
程度の電圧を印加した場合、溶接時に発生する熱が電池
ケースを通じて電極、セパレータにまで到達してしま
い、セパレータの穴あき、収縮を起こし、容量劣化や電
池内ショートを起こしたり、また、溶接部分に電圧が集
中するため溶接部分に通じる電極が集電体から剥げ落ち
るなどの不具合が生じ、電池としての機能の低下を引き
起こす。When these flat non-aqueous electrolyte secondary batteries are incorporated in equipment, most of them are formed by welding lead terminals to the outside of a positive electrode case and a negative electrode case by resistance welding.
Generally, the terminal and the device are soldered and incorporated. However, as described above, in a flat nonaqueous electrolyte secondary battery in which the electrode group in which the thickness of the mixture layer including the positive electrode, the negative electrode, and the separator is 1.0 mm or less is laminated or wound and enclosed in the battery, The stacked or wound electrode group is brought into direct contact with the positive and negative electrode cases via a thin positive and negative electrode having a thickness of 1 mm or less and a thin film separator made of polyethylene or polypropylene having a thickness of 0.5 mm or less. The case and the electrodes are collecting current. In order to perform resistance welding in this battery system, 300-450 V
When a voltage of about the same level is applied, the heat generated during welding reaches the electrodes and the separator through the battery case, causing perforation and shrinkage of the separator, causing capacity deterioration and short-circuiting in the battery, and also in the welding area. Since the voltage is concentrated on the electrode, the electrodes leading to the welded portion may be peeled off from the current collector or the like, resulting in deterioration of the battery function.
【０００７】一方、溶接時の出力を下げた場合、前述し
たような不具合は起こらなくなるが、溶接強度が弱くな
るため、リード端子がとれたり、電池とリード端子の接
触が悪くなってしまう。また、リード端子の溶接方法を
レーザー溶接などに変更しても熱の発生は抑えられず、
同様の不具合を招くというような問題がある。On the other hand, when the output during welding is reduced, the above-mentioned problem does not occur, but the welding strength is weakened, so that the lead terminal is removed or the contact between the battery and the lead terminal is deteriorated. In addition, even if the welding method of the lead terminal is changed to laser welding, etc., the generation of heat cannot be suppressed,
There is a problem that causes the same problem.
【０００８】[0008]
【発明が解決しようとする課題】本発明は上記情況に対
処するためになされたもので、その課題は正極、負極、
セパレータからなる電極層を積層もしくは捲回した電極
群を電池内に内包する扁平形非水電解質二次電池におい
て、前記電極層の厚さは１．０ｍｍ以下であり、リード
端子溶接により発生する熱による、電池内の電極、セパ
レータの破壊を抑制し、容量劣化や電池内ショートを防
止できるリード端子を備えたリード端子付扁平形非水電
解質二次電池を提供するものである。SUMMARY OF THE INVENTION The present invention has been made in order to cope with the above situation, and its object is to provide a positive electrode, a negative electrode,
In a flat nonaqueous electrolyte secondary battery in which an electrode group formed by laminating or winding an electrode layer formed of a separator is included in the battery, the thickness of the electrode layer is 1.0 mm or less, and the heat generated by lead terminal welding is reduced. The present invention provides a flat nonaqueous electrolyte secondary battery with a lead terminal provided with a lead terminal capable of suppressing the destruction of an electrode and a separator in a battery and preventing a capacity deterioration and a short circuit in the battery.
【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
に、本発明は、外部回路に接続するリード端子を電池に
溶接するリード端子付扁平形非水電解質二次電池におい
て、前記リード端子の電池への溶接位置は電極群を内包
した部分を避けた電池ケースの周辺部とし、また、リー
ド端子は帯状または環状の金属板を用いた構成としてい
る。In order to solve the above problems, the present invention relates to a flat nonaqueous electrolyte secondary battery with a lead terminal for welding a lead terminal connected to an external circuit to a battery. The position of welding to the battery is at the periphery of the battery case avoiding the portion containing the electrode group, and the lead terminals are formed using a band-shaped or annular metal plate.
【００１０】まず、本発明電池は電極を含めた電池の構
造に主点をおいたものであり、正極作用物質については
限定されるものではなく、ＭｎＯ2、Ｖ2Ｏ5、ＬｉＴｉ2
Ｏ4、Ｌｉ4Ｔｉ5Ｏ12、ＬｉＦｅ2Ｏ4、コバルト酸リチ
ウム、ニッケル酸リチウム、マンガン酸リチウムなどの
金属酸化物、あるいはフッ化黒鉛、ＦｅＳ2などの無機
化合物、あるいはポリアニリンやポリアセン構造体など
の有機化合物などあらゆる物が適用可能である。ただ
し、この中で作用電位が高く、サイクル特性に優れると
いう点でコバルト酸リチウム、ニッケル酸リチウム、マ
ンガン酸リチウムやそれらの混合物やそれらの元素の一
部を他の金属元素で置換したリチウム含有酸化物がより
好ましく、長期間に渡り使用されることもある扁平形非
水電解質二次電池においては高容量で電解液や水分との
反応性が低く化学的に安定であるという点でコバルト酸
リチウムがさらに好ましい。First, the battery of the present invention mainly focuses on the structure of the battery including the electrodes, and there is no limitation on the positive electrode active material. MnO 2 , V 2 O 5 , LiTi 2
Metal oxides such as O 4 , Li 4 Ti 5 O 12 , LiFe 2 O 4 , lithium cobaltate, lithium nickelate, lithium manganate, or inorganic compounds such as graphite fluoride, FeS 2 , or polyaniline or polyacene structures Any substance such as an organic compound such as is applicable. However, lithium-containing oxides in which lithium cobaltate, lithium nickelate, lithium manganate, mixtures thereof, and some of these elements have been substituted with other metal elements because of their high action potential and excellent cycle characteristics. Is more preferable, and the flat non-aqueous electrolyte secondary battery, which may be used for a long period of time, has a high capacity, a low reactivity with an electrolytic solution or moisture, and is chemically stable. Is more preferred.
【００１１】また、本発明電池の負極作用については限
定されるものではなく、金属リチウム、あるいはＬｉ−
Ａｌ、Ｌｉ−Ｉｎ、Ｌｉ−Ｓｎ、Ｌｉ−Ｓｉ、Ｌｉ−Ｇ
ｅ、Ｌｉ−Ｂｉ、Ｌｉ−Ｐｂなどのリチウム合金、ある
いはポリアセン構造体などの有機化合物、あるいはリチ
ウムを吸蔵、放出可能な炭素質材料、あるいはＮｂ
2Ｏ5、ＬｉＴｉ2Ｏ4、Ｌｉ4Ｔｉ5Ｏ12やＬｉ含有珪素酸
化物のような酸化物などあらゆるものが適用可能である
が、サイクル特性に優れ、作動電位が低く、高容量であ
るという点でＬｉを吸蔵、放出可能な炭素質材料が好ま
しく、特に放電末期においても電池作動電圧の低下が少
ないという点で天然黒鉛や人造黒鉛、膨張黒鉛、メソフ
ェーズピッチ焼成体、メソフェーズピッチ繊維焼成体な
どのｄ002面の面間隔が０．３３８ｎｍ以下の黒鉛構造
が発達した炭素質材料がより好ましい。The function of the negative electrode of the battery of the present invention is not limited.
Al, Li-In, Li-Sn, Li-Si, Li-G
e, a lithium alloy such as Li-Bi, Li-Pb, an organic compound such as a polyacene structure, or a carbonaceous material capable of occluding and releasing lithium, or Nb
Oxides such as 2 O 5 , LiTi 2 O 4 , Li 4 Ti 5 O 12 and oxides such as Li-containing silicon oxide can be applied, but they have excellent cycle characteristics, low operating potential, and high capacity. In this respect, a carbonaceous material capable of occluding and releasing Li is preferable, and natural graphite, artificial graphite, expanded graphite, mesophase pitch fired body, and mesophase pitch fiber fired body are particularly preferable in that the operating voltage of the battery is small even at the end of discharge. carbonaceous material spacing of d 002 plane, such as the following graphite structure 0.338nm has developed is more preferable.
【００１２】さらに、電極については正負極とも従来の
顆粒合剤の成形方式や金属ネットの金属基盤に合剤を充
填する方法を用いてもよいが肉薄電極の作製が行い易い
という点で金属箔にスラリー状の合剤を塗布、乾燥した
ものがよく、さらにそれを圧延したものを用いることも
できる。このような金属箔に作用物質を含む合剤層を塗
工した電極を用いる場合は、電極群の内部に用いる電極
は金属箔の両面に作用物質層を形成したものを用いるの
が、容積効率の上から好ましく、電極群の両端の金属ネ
ットに接触する電極構成材露出部については接触抵抗を
低減させるために電極構成材の内、特に金属箔を露出さ
せるのが好ましい。これに関してはこの部分に限り片面
にのみ作用物質層を形成した電極を用いてもよいし、一
旦、両面に作用物質層を形成した後、片面のみ作用物質
層を除去してもよい。Further, as for the electrodes, for the positive and negative electrodes, a conventional method of molding a granular mixture or a method of filling the metallic base of a metal net with the mixture may be used. A slurry mixture is preferably applied and dried, and a rolled product thereof can also be used. When using an electrode in which a mixture layer containing an active substance is applied to such a metal foil, the electrode used inside the electrode group is one in which an active substance layer is formed on both sides of the metal foil. It is preferable from the top, and it is preferable to expose the metal foil, particularly the metal foil, of the electrode component material in order to reduce the contact resistance with respect to the electrode component material exposed portion that contacts the metal nets at both ends of the electrode group. In this regard, an electrode having an active substance layer formed only on one side may be used only for this portion, or an active substance layer may be formed on both sides, and then the active substance layer may be removed only on one side.
【００１３】また、電池に溶接するリード端子の材料に
ついては、導電性の得られるものであればいずれのもの
でもよいが、その汎用性などからステンレス製のものが
好ましい。また、端子の厚さ、形状についても特に限定
されるものではない。The material of the lead terminal to be welded to the battery may be any material as long as it can obtain conductivity, but is preferably made of stainless steel in view of its versatility. Also, the thickness and shape of the terminal are not particularly limited.
【００１４】[0014]
【発明の実施の形態】以下、本発明の実施例及び比較例
について詳細に説明する。図１は本発明の実施例１の断
面図であり、図２は図１の電池ケース周辺部の拡大図で
ある。DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention and comparative examples will be described in detail. FIG. 1 is a cross-sectional view of the first embodiment of the present invention, and FIG. 2 is an enlarged view of the periphery of the battery case of FIG.
【００１５】図に示すように、本実施例１の扁平形非水
電解質二次電池は、負極端子を兼ねる金属製の負極ケー
ス５と、正極端子を兼ねる金属製の正極ケース１が、絶
縁ガスケット６を介し嵌合され、さらに正極ケース１ま
たは負極ケース５が加締め加工により加締められた封口
構造を有し、その内部に少なくとも正極作用物質含有層
２、セパレータ３、負極作用物質含有層４を含む発電要
素と、非水電解質を内包しており、さらに正極ケース１
にはリード端子７を、また負極ケース５にはリード端子
８が溶接されている。As shown in the figure, the flat nonaqueous electrolyte secondary battery of the first embodiment comprises a metal negative electrode case 5 also serving as a negative electrode terminal and a metal positive electrode case 1 also serving as a positive electrode terminal. 6, the positive electrode case 1 or the negative electrode case 5 has a sealing structure in which the positive electrode case 1 or the negative electrode case 5 is caulked by caulking, and at least the positive electrode active material containing layer 2, the separator 3, and the negative electrode active material containing layer 4 are provided therein. And a non-aqueous electrolyte, and a positive electrode case 1
, And a lead terminal 8 is welded to the negative electrode case 5.
【００１６】本実施例においては、図３で示される帯状
の厚さ０．２ｍｍのステンレスの金属板からなるリード
端子７、８を用い、このリード端子７、８の溶接位置
９、１０は図２に示すように、電極群が接触している部
分を避けた負極ケース５の範囲Ｂ内であり、また正極ケ
ース１での電極群が接触している部分を避けた範囲Ａ内
である。In the present embodiment, the lead terminals 7, 8 made of a stainless steel metal plate having a thickness of 0.2 mm as shown in FIG. 3 are used, and welding positions 9, 10 of the lead terminals 7, 8 are shown in FIG. As shown in FIG. 2, it is within a range B of the negative electrode case 5 where the portion where the electrode group is in contact is avoided, and is within a range A where the portion of the positive electrode case 1 where the electrode group is in contact is avoided.
【００１７】次に、本実施例電池の製造方法について説
明する。まず、ＬｉＣｏＯ2１００質量部に対し導電材
としてアセチレンブラック５質量部と黒鉛粉末５質量部
を加え、結着剤としてポリフッ化ビニリデンを５質量部
加え、Ｎ−メチルピロリドンで希釈、混合し、スラリー
状の正極合剤を得た。次に、この正極合剤を、正極集電
体である厚さ０．０２ｍｍのアルミ箔の片面にドクター
ブレード法により塗工、乾燥を行い、アルミ箔表面に正
極作用物質含有層２を形成した。以後、正極作用物質含
有層の塗膜厚さが両面で０．１５ｍｍとなるまで塗工、
乾燥を繰り返し、両面塗工正極を作製した。次に、この
電極体の片面の端から１０ｍｍ部分の作用物質含有層を
除去し、アルミ層を剥き出し通電部とし、幅１５ｍｍ、
長さ１２０ｍｍ、厚さ０．１５ｍｍの長さに切り出した
正極板を作製した。Next, a method of manufacturing the battery of this embodiment will be described. First, to 100 parts by mass of LiCoO 2 , 5 parts by mass of acetylene black and 5 parts by mass of graphite powder were added as conductive materials, 5 parts by mass of polyvinylidene fluoride was added as a binder, and the mixture was diluted with N-methylpyrrolidone, mixed, and then slurried. A positive electrode mixture was obtained. Next, this positive electrode mixture was applied to one surface of a 0.02 mm-thick aluminum foil as a positive electrode current collector by a doctor blade method and dried to form a positive electrode active substance-containing layer 2 on the aluminum foil surface. . Thereafter, coating until the coating thickness of the positive electrode active substance containing layer is 0.15 mm on both sides,
The drying was repeated to produce a double-sided coated positive electrode. Next, the active substance-containing layer of 10 mm portion was removed from one end of this electrode body, and the aluminum layer was exposed to form a current-carrying part.
A positive electrode plate cut to a length of 120 mm and a thickness of 0.15 mm was produced.
【００１８】次に、黒鉛化メソフェーズピッチ炭素繊維
粉末１００質量部に結着剤としてスチレンブタジエンゴ
ム（ＳＢＲ）とカルボキシメチルセルロース（ＣＭＣ）
をそれぞれ２．５質量部を添加し、イオン交換水で希
釈、混合し、スラリー状の負極合剤を得た。得られた負
極合剤を負極集電体である厚さ０．０２ｍｍの銅箔に負
極作用物質含有層４の厚さが０．１５ｍｍとなるように
正極の場合と同様に塗工、乾燥を繰り返し実施し両面塗
工負極を作製した。次に、この集電体の片面の端から１
０ｍｍ部分の作用物質含有層を除去し、銅層を剥き出し
通電部とし、幅１５ｍｍ、長さ１２０ｍｍ、厚さ０．１
５ｍｍの長さに切り出した負極板を作製した。Next, styrene-butadiene rubber (SBR) and carboxymethyl cellulose (CMC) were used as binders in 100 parts by mass of the graphitized mesophase pitch carbon fiber powder.
Were added and diluted with ion-exchanged water and mixed to obtain a slurry-like negative electrode mixture. The obtained negative electrode mixture is applied and dried on a 0.02 mm-thick copper foil as a negative electrode current collector in the same manner as in the case of the positive electrode so that the thickness of the negative electrode active material-containing layer 4 becomes 0.15 mm. This was repeated to produce a double-sided coated negative electrode. Next, from the end of one side of this current collector, 1
The active substance-containing layer at the 0 mm portion was removed, and the copper layer was exposed to form a current-carrying part. The width was 15 mm, the length was 120 mm, and the thickness was 0.1.
A negative electrode plate cut to a length of 5 mm was produced.
【００１９】次に、正負極通電部面を外周巻き終わり側
とし、これら正極と負極の間に厚さ２５μｍのポリエチ
レン微多孔膜からなるセパレータ３を介し渦巻状に捲回
し、扁平形電池の扁平面に対し水平方向に正負極対向部
を持つように一定方向に捲回電極の中心部の空間がなく
なるまで加圧した。Next, the current-carrying surface of the positive and negative electrodes is set to the outer peripheral winding end side, and spirally wound between the positive electrode and the negative electrode with a separator 3 made of a 25 μm-thick polyethylene microporous film interposed therebetween, to obtain a flat battery. Pressure was applied in a certain direction until the space at the center of the wound electrode was exhausted so that the positive and negative electrode facing portions were horizontal to the surface.
【００２０】作製した電極群を８５℃で１２ｈ乾燥した
後、絶縁ガスケット６を一体化した負極金属ケース５の
内底面に電極群の片面塗工負極板の未塗工側が金属ネッ
トに接する用に配置し、エチレンカーボネートとメチル
エチルカーボネートを体積比１：１の割合で混合した溶
媒に支持塩としてＬｉＰＦ6を１ｍｏｌ／ｌの割合で溶
解せしめた非水電解質を注液し、さらにステンレス製の
正極ケース１を嵌合し、上下反転後、正極ケースに加締
め加工を実施し、封口し、厚さ３ｍｍ、直径φ２４．５
ｍｍの実施例の扁平形非水電解質二次電池を製作した。
また、これらの電池において４．２Ｖ、３ｍＡの定電流
定電圧で４８ｈ初充電を実施した。After the produced electrode group is dried at 85 ° C. for 12 hours, the uncoated side of the single-side coated negative electrode plate of the electrode group is brought into contact with the metal net on the inner bottom surface of the negative electrode metal case 5 with the insulating gasket 6 integrated therewith. A nonaqueous electrolyte obtained by dissolving LiPF 6 as a supporting salt at a rate of 1 mol / l as a supporting salt in a solvent in which ethylene carbonate and methyl ethyl carbonate are mixed at a volume ratio of 1: 1 was injected, and a stainless steel positive electrode was further placed. After fitting the case 1 and turning it upside down, the positive electrode case is crimped, sealed, and has a thickness of 3 mm and a diameter of φ24.5.
Example 2 A flat non-aqueous electrolyte secondary battery of Example of Example was manufactured.
In addition, these batteries were initially charged at a constant current and a constant voltage of 4.2 V and 3 mA for 48 hours.
【００２１】表１は扁平形電池の正極ケース側を、表２
は負極ケース側を図５のごとき従来の溶接位置と、図２
の本実施例のごとく電極群を内包した部分を避けた面に
溶接した場合とを溶接エネルギー毎に比較したものであ
る。比較数は各１０００個、電圧テスター及び端子引張
り試験により評価を行った。ここでの、内部短絡不良と
は、溶接により電圧が４．０Ｖを下回ったものをさし、
また、溶接不良とは引張り試験で、２．９Ｎ以下の強度
しか得られなかったものをさす。Table 1 shows the positive electrode case side of the flat battery, and Table 2
FIG. 2 shows a conventional welding position as shown in FIG.
The comparison is made for each welding energy with the case where welding is performed on the surface avoiding the portion including the electrode group as in this embodiment. The number of comparisons was evaluated by a 1000 voltage tester and a terminal tensile test. Here, the internal short-circuit failure means that the voltage has dropped below 4.0 V by welding.
In addition, poor welding refers to a steel sheet having a strength of 2.9 N or less in a tensile test.
【００２２】[0022]
【表１】 [Table 1]
【００２３】[0023]
【表２】 [Table 2]
【００２４】本発明の他の実施例として、図４に示すよ
うに、厚さ０．２ｍｍのステンレスの金属板からなるリ
ード端子１２が図２に示すように電極群を内包した部分
を避けた周辺部の面（溶接位置）１３にシリーズスポッ
ト溶接によって固着されている場合について、上記図３
の帯状の金属板からなるリード端子を用いた場合と同様
の内部短絡不良と溶接不良についての評価を行って、そ
の結果を表３、表４に示した。As another embodiment of the present invention, as shown in FIG. 4, a lead terminal 12 made of a stainless steel metal plate having a thickness of 0.2 mm avoids a portion including an electrode group as shown in FIG. FIG. 3 shows a case where the surface is fixed to the peripheral surface (welding position) 13 by series spot welding.
The same internal short-circuit failure and poor welding were evaluated as in the case of using the lead terminal made of a strip-shaped metal plate, and the results are shown in Tables 3 and 4.
【００２５】[0025]
【表３】 [Table 3]
【００２６】[0026]
【表４】 [Table 4]
【００２７】溶接機はセイワ製溶接機ＭＣ−１６０Ｂを
使用し、従来の溶接は出力を正極ケース４８０Ｖ、負極
ケース３５０Ｖとしている。従来の溶接位置では、溶接
電圧が低いと、内部短絡不良は起きないが、溶接不良が
多くなる。溶接出力を高くすると、溶接不良は減少する
が、内部短絡が増加する。本実施例の溶接条件では電極
群を内包した部分を避けた電極ケースの周辺部で溶接し
ているため、出力を上げても内部短絡は起こさない。こ
のため、出力を従来の３０％向上させても溶接の悪影響
がない。As a welding machine, a welding machine MC-160B manufactured by Seiwa was used, and in the conventional welding, the output was 480 V for the positive electrode case and 350 V for the negative electrode case. At a conventional welding position, if the welding voltage is low, internal short-circuit failure does not occur, but welding failure increases. Increasing the welding power reduces welding defects but increases internal short circuits. Under the welding conditions of this embodiment, since the welding is performed at the periphery of the electrode case avoiding the portion including the electrode group, no internal short circuit occurs even when the output is increased. Therefore, there is no adverse effect of welding even if the output is improved by 30% compared with the conventional case.
【００２８】なお、本発明の実施例では、図３や図４の
ような帯状または環状のリード端子を使用したが、リー
ド端子自体の形状を規定するものではなく、電池を搭載
する電子機器などにより、適宜形状を変更することがで
きる。また、リード端子の先端にリード線付コネクタを
接合したリード端子でも本実施例と同様な効果が得られ
る。In the embodiment of the present invention, the band-shaped or ring-shaped lead terminal as shown in FIGS. 3 and 4 is used. Thus, the shape can be appropriately changed. In addition, the same effect as that of the present embodiment can be obtained with a lead terminal in which a connector with a lead wire is joined to the end of the lead terminal.
【００２９】また、本発明の実施例は、非水電解質に非
水溶媒を用いた扁平形非水溶媒二次電池を用いたが、電
池形状については正極ケースの加締め加工により封口す
るコイン形非水電解質二次電池をもとに説明したが、正
負極電極を入れ替え、負極ケースの加締め加工により封
口することも可能である。さらに、電池形状についても
円形のコイン形である必要はなく小判形などの特殊形状
を有する扁平形非水電解質二次電池においても適用可能
である。In the embodiment of the present invention, a flat non-aqueous solvent secondary battery using a non-aqueous solvent as a non-aqueous electrolyte was used. Although the description has been given based on the non-aqueous electrolyte secondary battery, it is also possible to replace the positive and negative electrodes and seal the negative electrode case by crimping. Further, the shape of the battery does not need to be a circular coin shape, and can be applied to a flat nonaqueous electrolyte secondary battery having a special shape such as an oval shape.
【００３０】[0030]
【発明の効果】以上説明したように、本発明によれば正
極電極、負極電極、セパレータからなる電極群を内包し
た部分を避けた電池ケース周辺部にリード端子を溶接す
ることにより、内部活物質に影響を及ぼすことなく、溶
接を行うことができ、また、溶接出力を従来よりもおよ
そ３０％上げることができ、しかも溶接不良を減少さ
せ、溶接強度を安定させることができるという、非常に
大きな工業的価値を有するリード端子付扁平形非水電解
質二次電池を提供することができる。As described above, according to the present invention, the internal active material is formed by welding the lead terminal to the periphery of the battery case except for the portion including the electrode group including the positive electrode, the negative electrode, and the separator. Welding can be performed without affecting welding, and the welding output can be increased by about 30% as compared with the conventional one, and furthermore, welding defects can be reduced and welding strength can be stabilized. A flat nonaqueous electrolyte secondary battery with lead terminals having industrial value can be provided.
【図１】本発明の実施例１の扁平形非水電解質二次電池
の断面図。FIG. 1 is a cross-sectional view of a flat nonaqueous electrolyte secondary battery according to Embodiment 1 of the present invention.
【図２】図１のリード端子溶接位置の拡大断面図。FIG. 2 is an enlarged cross-sectional view of a lead terminal welding position in FIG.
【図３】図１に用いるリード端子の斜視図。FIG. 3 is a perspective view of a lead terminal used in FIG. 1;
【図４】本発明の他の実施例に用いるリード端子の斜視
図。FIG. 4 is a perspective view of a lead terminal used in another embodiment of the present invention.
【図５】従来のリード端子付き扁平形非水電解質二次電
池の断面図。FIG. 5 is a cross-sectional view of a conventional flat nonaqueous electrolyte secondary battery with lead terminals.
【図６】従来の扁平形非水電解質二次電池の断面図。FIG. 6 is a cross-sectional view of a conventional flat nonaqueous electrolyte secondary battery.
１…正極ケース、２…正極作用物質含有層（塗工電
極）、３…セパレータ、４…負極作用物質含有層（塗工
電極）、５…負極ケース、６…絶縁ガスケット、７，
８，１２…リード端子、９，１０，１３…溶接位置、１
４…正極、１５…負極。DESCRIPTION OF SYMBOLS 1 ... Positive electrode case, 2 ... Positive active material containing layer (coated electrode), 3 ... Separator, 4 ... Negative active material containing layer (coated electrode), 5 ... Negative case, 6 ... Insulating gasket, 7,
8, 12 ... lead terminal, 9, 10, 13 ... welding position, 1
4 ... Positive electrode, 15 ... Negative electrode.
───────────────────────────────────────────────────── フロントページの続き Ｆターム(参考） 5H011 AA09 AA13 CC06 DD03 DD15 KK01 5H022 AA09 BB03 BB06 BB11 BB24 CC02 CC09 KK04 5H029 AJ12 AJ14 AK02 AK03 AK07 AK16 AL03 AL06 AL12 AM03 AM04 AM07 BJ03 BJ12 BJ14 BJ25 CJ05 DJ02 DJ05 DJ12 HJ04 HJ12 ──────────────────────────────────────────────────続 き Continued on the front page F-term (reference) HJ12
Claims (2)
と、正極端子を兼ねる金属製の正極ケースが、絶縁ガス
ケットを介し嵌合され、さらに前記正極ケースまたは負
極ケースが加締め加工により加締められた封口構造を有
し、少なくとも正極、負極、薄膜セパレータを合わせた
電極層を積層もしくは捲回した電極群と、非水電解質を
内包し、かつ外部回路に接続するリード端子を当該電極
ケースに溶接してなるリード端子付扁平形非水電解質二
次電池において、前記電極層の厚さは１．０ｍｍ以下で
あり、前記リード端子の当該電極ケースへの溶接位置は
正極及び負極電極群を内包した部分を避けた正極及び負
極ケースの周辺部であることを特徴とするリード端子付
扁平形非水電解質二次電池。A metal negative electrode case also serving as a negative electrode terminal and a metal positive electrode case also serving as a positive electrode terminal are fitted via an insulating gasket, and the positive electrode case or the negative electrode case is caulked by caulking. An electrode group having at least a positive electrode, a negative electrode, and a thin film separator laminated or wound, and a lead terminal containing a nonaqueous electrolyte and connecting to an external circuit are welded to the electrode case. In the flat non-aqueous electrolyte secondary battery with the lead terminal formed as described above, the thickness of the electrode layer is 1.0 mm or less, and the welding position of the lead terminal to the electrode case includes a positive electrode and a negative electrode group. A flat non-aqueous electrolyte secondary battery with lead terminals, characterized in that it is a peripheral portion of the positive and negative electrode cases avoiding the portion.
あることを特徴とする請求項１記載のリード端子付扁平
形非水電解質二次電池。2. The flat nonaqueous electrolyte secondary battery with a lead terminal according to claim 1, wherein the lead terminal is a band-shaped or annular metal plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001125780A JP4901017B2 (en) | 2001-04-24 | 2001-04-24 | Flat nonaqueous electrolyte secondary battery with lead terminals |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001125780A JP4901017B2 (en) | 2001-04-24 | 2001-04-24 | Flat nonaqueous electrolyte secondary battery with lead terminals |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2002324584A true JP2002324584A (en) | 2002-11-08 |
| JP4901017B2 JP4901017B2 (en) | 2012-03-21 |
Family
ID=18974938
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001125780A Expired - Fee Related JP4901017B2 (en) | 2001-04-24 | 2001-04-24 | Flat nonaqueous electrolyte secondary battery with lead terminals |
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| Country | Link |
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| JP (1) | JP4901017B2 (en) |
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| US10971776B2 (en) | 2009-06-18 | 2021-04-06 | Varta Microbattery Gmbh | Button cell having winding electrode and method for the production thereof |
| US11024906B2 (en) | 2009-06-18 | 2021-06-01 | Varta Microbattery Gmbh | Button cell having winding electrode and method for the production thereof |
| US11158896B2 (en) | 2009-06-18 | 2021-10-26 | Varta Microbattery Gmbh | Button cell having winding electrode and method for the production thereof |
| US11217844B2 (en) | 2009-06-18 | 2022-01-04 | Varta Microbattery Gmbh | Button cell having winding electrode and method for the production thereof |
| US10804506B2 (en) | 2009-06-18 | 2020-10-13 | Varta Microbattery Gmbh | Button cell having winding electrode and method for the production thereof |
| US11791512B2 (en) | 2009-06-18 | 2023-10-17 | Varta Microbattery Gmbh | Button cell having winding electrode and method for the production thereof |
| US11362385B2 (en) | 2009-06-18 | 2022-06-14 | Varta Microbattery Gmbh | Button cell having winding electrode and method for the production thereof |
| JP2013243062A (en) * | 2012-05-22 | 2013-12-05 | Hitachi Ltd | Battery |
| US11063311B2 (en) | 2017-07-18 | 2021-07-13 | Maxell Holdings, Ltd. | Battery with external terminals |
| WO2019017410A1 (en) | 2017-07-18 | 2019-01-24 | マクセルホールディングス株式会社 | Battery with external terminals |
| CN110235278A (en) * | 2017-07-18 | 2019-09-13 | 麦克赛尔控股株式会社 | Battery with external terminal |
| JP7092762B2 (en) | 2017-07-18 | 2022-06-28 | マクセル株式会社 | Battery with external terminal |
| CN110235278B (en) * | 2017-07-18 | 2022-02-08 | 麦克赛尔株式会社 | Battery with external terminal |
| JPWO2019017410A1 (en) * | 2017-07-18 | 2020-05-28 | マクセルホールディングス株式会社 | Battery with external terminal |
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