JP2002042885A - Mounting type lithium battery - Google Patents
Mounting type lithium batteryInfo
- Publication number
- JP2002042885A JP2002042885A JP2000219592A JP2000219592A JP2002042885A JP 2002042885 A JP2002042885 A JP 2002042885A JP 2000219592 A JP2000219592 A JP 2000219592A JP 2000219592 A JP2000219592 A JP 2000219592A JP 2002042885 A JP2002042885 A JP 2002042885A
- Authority
- JP
- Japan
- Prior art keywords
- lithium battery
- current collector
- negative electrode
- positive electrode
- battery
- 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
-
- 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
Landscapes
- Sealing Battery Cases Or Jackets (AREA)
- Secondary Cells (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は実装型リチウム電池
に関し、特に発電要素を金属箔製外装体に収容し、正負
極端子を同一面から取出せる構造とした実装型リチウム
電池に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mountable lithium battery, and more particularly to a mountable lithium battery having a structure in which a power generation element is housed in a metal foil outer package and positive and negative terminals are taken out from the same surface.
【０００２】[0002]
【従来の技術】近年、ＩＣカードやメモリーカードに代
表される半導体装置の電源として、エネルギー密度や厚
みの観点からコイン型や偏平型と称される薄形のリチウ
ム電池が開発されている。2. Description of the Related Art In recent years, as a power source for a semiconductor device represented by an IC card or a memory card, a thin lithium battery called a coin type or a flat type has been developed in view of energy density and thickness.
【０００３】しかしながら、従来の薄形リチウム電池に
おいては、外装体が正極と負極に分かれており、互いに
対向した面から、双方の電極を取出す構成であり、その
ため、半導体装置に実装した場合、配線が複雑となり、
その結果、半導体装置の厚みが増加し、さらにコストが
アップしていた。However, in a conventional thin lithium battery, an outer package is divided into a positive electrode and a negative electrode, and both electrodes are taken out from surfaces facing each other. Becomes complicated,
As a result, the thickness of the semiconductor device has increased and the cost has further increased.
【０００４】上記のような半導体装置によれば、ＩＣチ
ップを組み込んだ構成であり、電池はこのＩＣチップの
主電源あるいはメモリーバックアップ電源として使用さ
れる。したがって、これら電池とＩＣチップとを直接接
合することができれば、配線が簡略化でき、半導体装置
の厚みの増加やコストアップを抑えることができる。こ
の場合、電池には同一面から両端子を取出せる電池構造
がよい。According to the above-described semiconductor device, an IC chip is incorporated, and a battery is used as a main power supply or a memory backup power supply for the IC chip. Therefore, if these batteries and the IC chip can be directly joined, wiring can be simplified, and increase in thickness and cost of the semiconductor device can be suppressed. In this case, the battery preferably has a battery structure that allows both terminals to be taken out from the same surface.
【０００５】特開平１−１４０５５３号において、同一
面から正負極両端子が取出す電池構造が提案されてい
る。Japanese Patent Application Laid-Open No. 1-140553 has proposed a battery structure in which both positive and negative terminals are taken out from the same surface.
【０００６】図２に同公報にて提示された封止性の高い
密閉構造を有する偏平型電源素子であり、同一面から正
負極両端子を取出させる電池構造の概略図である。FIG. 2 is a schematic view of a flat type power supply element having a hermetically sealed structure disclosed in the same publication and having both positive and negative terminals taken out from the same surface.
【０００７】偏平型電源素子のケースとして、金属箔か
らなる第１のケース半体１および第２のケース半体２を
備え、ケースの周縁部３において溶接されることで封止
される。第１のケース半体１には開口９が形成され、こ
の開口９に臨むように、金属箔からなる電極板７が配置
されている。さらに電極板７と第１のケース半体１は樹
脂からなる絶縁層８によって互いに絶縁され、かつ封止
された状態となっている。このようにして密閉された収
納部には第１の電極４と第２の電極５との間にセパレー
タ６を配設してなる発電要素が収納されている。[0007] As a case of a flat type power supply element, a first case half 1 and a second case half 2 made of metal foil are provided, and the case is sealed by welding at a peripheral portion 3 of the case. An opening 9 is formed in the first case half 1, and an electrode plate 7 made of a metal foil is arranged so as to face the opening 9. Further, the electrode plate 7 and the first case half 1 are insulated from each other by an insulating layer 8 made of resin and are in a sealed state. A power generation element in which the separator 6 is disposed between the first electrode 4 and the second electrode 5 is stored in the storage section sealed in this manner.
【０００８】以上のとおり、第１のケース半体１に開口
９を設けることで、同一面から両端子を取出し、これに
よってＩＣチップと直接接合することができる。As described above, by providing the opening 9 in the first case half 1, both terminals can be taken out from the same surface, and thereby can be directly joined to the IC chip.
【０００９】[0009]
【発明が解決しようとする課題】しかしながら、上記構
成の偏平型電源素子（実装型リチウム電池）を半導体装
置に実装し、耐久性試験をおこなうと、その薄型構造に
起因し電池が曲がりやすくなっており、そして、ＩＣチ
ップに対し直に力がかかり、ＩＣチップが破損するとい
う課題がある。However, when the flat power supply element (mounting type lithium battery) having the above configuration is mounted on a semiconductor device and subjected to a durability test, the battery is easily bent due to its thin structure. There is a problem that a force is directly applied to the IC chip and the IC chip is damaged.
【００１０】かかる課題を解消するために、ＩＣチップ
を保護すべくＩＣチップと重ねるように補強板が設け、
ＩＣチップに直に力がかかることを防ぐ技術が提案され
ている。In order to solve this problem, a reinforcing plate is provided so as to overlap the IC chip to protect the IC chip,
Techniques have been proposed for preventing direct application of force to an IC chip.
【００１１】図３は、このような補強板を用いて、偏平
型電源素子（実装型リチウム電池）を半導体装置に実装
した断面構成を示す。FIG. 3 shows a cross-sectional configuration in which a flat type power supply element (mounted lithium battery) is mounted on a semiconductor device using such a reinforcing plate.
【００１２】この半導体装置３０において、３１は実装
型リチウム電池であり、実装型リチウム電池３１の上に
ＩＣチップ３２を設け、実装型リチウム電池３１の下側
に補強板３３を配している。In the semiconductor device 30, reference numeral 31 denotes a mountable lithium battery. An IC chip 32 is provided on the mountable lithium battery 31, and a reinforcing plate 33 is provided below the mountable lithium battery 31.
【００１３】しかしながら、上記構成の半導体装置３０
によれば、補強板３３を用いるにしても、半導体装置３
０の所定の厚み（例えば、ICカードなら0.76mm）に収ま
らなくなり、現実には支障をきたしている。However, the semiconductor device 30 having the above configuration
According to the above, even when the reinforcing plate 33 is used, the semiconductor device 3
It cannot fit within a predetermined thickness of 0 (for example, 0.76 mm for an IC card), which is actually a hindrance.
【００１４】ちなみに、現状の半導体装置においては、
実装型リチウム電池３１およびＩＣチップ３２との組合
せと、と補強板３３とは別々に離して収納し、ＩＣチッ
プ３２と実装型リチウム電池３１とを配線で接続する構
造である。Incidentally, in the current semiconductor device,
In this structure, the combination of the mountable lithium battery 31 and the IC chip 32 and the reinforcing plate 33 are separately housed separately, and the IC chip 32 and the mountable lithium battery 31 are connected by wiring.
【００１５】以上のとおり、補強板３３を用いること
で、半導体装置３０の厚みが大幅に増加し、近年の薄型
および小型化の市場ニーズにあっていない。しかも、部
品点数が増加することで、コストがアップしていた。As described above, the use of the reinforcing plate 33 significantly increases the thickness of the semiconductor device 30 and does not meet the market needs for a thinner and smaller device in recent years. In addition, the cost has increased due to the increase in the number of parts.
【００１６】本発明者は上記事情に鑑みて鋭意研究を重
ねた結果、上記のような補強板に代えて、正極および負
極のそれぞれの外側に金属箔からなる集電体を導電性接
着剤により接着させるという構成と、外装体を二つ折り
に成した構成とを組合せることで、半導体装置の厚みを
小さくしながらも、その曲げを防止できることを見出し
た。The inventor of the present invention has conducted intensive studies in view of the above circumstances. As a result, instead of the reinforcing plate as described above, a current collector made of a metal foil was provided outside each of the positive electrode and the negative electrode with a conductive adhesive. It has been found that, by combining the configuration of bonding and the configuration of folding the exterior body in two, the bending of the semiconductor device can be prevented while the thickness of the semiconductor device is reduced.
【００１７】したがって本発明は上記知見に鑑みて完成
されたものであり、その目的は半導体装置の厚みを減少
させながら、その信頼性を高めた低コスト化の実装型リ
チウム電池を提供することにある。Accordingly, the present invention has been completed in view of the above findings, and an object of the present invention is to provide a low-cost mounted lithium battery in which the thickness of a semiconductor device is reduced and the reliability thereof is improved. is there.
【００１８】[0018]
【課題を解決するための手段】本発明の実装型リチウム
電池は、金属箔からなる外装体の内側に正極と負極との
間に電解質を配設してなる発電要素を配設した電池構造
であって、正極および負極のそれぞれの外側に金属箔か
らなる集電体が導電性接着剤により接着され、さらに集
電体を露出すべく金属箔に開口部が設けられた前記外装
体を二つ折りに成し、一方の外装部分を絶縁性樹脂を介
して当該集電体上に接着せしめたことを特徴とする。The mounting type lithium battery of the present invention has a battery structure in which a power generation element having an electrolyte disposed between a positive electrode and a negative electrode is provided inside an outer package made of metal foil. Then, a current collector made of a metal foil is bonded to the outside of each of the positive electrode and the negative electrode with a conductive adhesive, and furthermore, the outer package body provided with an opening in the metal foil to expose the current collector is folded in two. Wherein one of the exterior parts is bonded to the current collector via an insulating resin.
【００１９】[0019]
【発明の実施の形態】以下、本発明の実装型リチウム電
池の実施形態を図面に基づいて説明する。図１は本発明
の実装型リチウム電池の断面図である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a mounted lithium battery according to the present invention will be described with reference to the drawings. FIG. 1 is a sectional view of a mounted lithium battery according to the present invention.
【００２０】１０は外装体、１１は折り返し部、１２は
接合部、１３は正極、１４は負極、１５は電解質、１６
は正極集電体、１７は負極集電体、１８は導電性接着
剤、１９は絶縁性樹脂、２０は開口部である。ここで、
正極１３と負極１４と電解質１５を合せて発電要素と呼
ぶ場合がある。10 is an exterior body, 11 is a folded portion, 12 is a joint, 13 is a positive electrode, 14 is a negative electrode, 15 is an electrolyte, 16
Is a positive electrode current collector, 17 is a negative electrode current collector, 18 is a conductive adhesive, 19 is an insulating resin, and 20 is an opening. here,
The positive electrode 13, the negative electrode 14, and the electrolyte 15 may be collectively referred to as a power generating element.
【００２１】図１に示した本発明に係る実装型リチウム
電池は、先ずシート状に形成された正極１３と同じくシ
ート状に形成された負極１４にそれぞれ正極集電体１６
と負極集電体１７とを導電性接着剤１８ａ、１８ｂを用
いて接着した。In the mounting type lithium battery according to the present invention shown in FIG. 1, a positive electrode 13 formed in a sheet shape and a negative electrode 14 formed in the same sheet
And the negative electrode current collector 17 were bonded using conductive adhesives 18a and 18b.
【００２２】次にゲル電解質溶液を含浸させた不織布を
前記正極１３と負極１４で挟みゲル電解質溶液を固化す
ることで正極１３と負極１４との間に電解質１５を配設
した発電要素を作製した。Next, a non-woven fabric impregnated with a gel electrolyte solution was sandwiched between the positive electrode 13 and the negative electrode 14, and the gel electrolyte solution was solidified to produce a power generating element having an electrolyte 15 disposed between the positive electrode 13 and the negative electrode 14. .
【００２３】この集電体を接着した発電要素を外装体１
０の負極側に導電性接着剤１８ｃを用いて接着し、さら
に発電要素との対峙部を凹状に加工した開口部２０を有
する正極側の外装体１０を折返し部１１で二つ折りにし
て、前記一方の外装部分を発電要素に被せ、絶縁性樹脂
１９で正極集電体１６と接着した後、三辺の接合部１２
を順次レーザー溶接することで作製される。The power generation element to which the current collector is adhered is used as an exterior body 1
The positive electrode side exterior body 10 having an opening 20 in which a portion facing the power generation element is processed into a concave shape is adhered to the negative electrode side of the negative electrode 0 using a conductive adhesive 18c, and is folded in two at the folded portion 11, After covering one exterior part on the power generation element and bonding it to the positive electrode current collector 16 with the insulating resin 19, the three-sided joint 12
Are sequentially laser-welded.
【００２４】外装体１０に用いる金属箔は、特に限定さ
れるものではないが、ステンレス、アルミニウム、ニッ
ケル、銅、コバール、鉄、チタンあるいはアルミニウム
合金のいずれかであれば、工業的に生産されており、入
手のし易さやコストの面から有利である。また、このよ
うな外装体１０については、製造方法や純度には特に限
定されない。The metal foil used for the exterior body 10 is not particularly limited, but may be any of stainless steel, aluminum, nickel, copper, kovar, iron, titanium, and aluminum alloy, and may be industrially produced. This is advantageous in terms of availability and cost. Further, the manufacturing method and purity of such an exterior body 10 are not particularly limited.
【００２５】かかる金属箔の厚みは、電池のエネルギー
密度の観点から薄いものを用いるのが望ましいが、ピン
ホールの有無や外装材としての強度の面から適当な厚み
が選択されるべきである。例えば、アルミニウムの場合
３０μｍ以上とすることが望ましい。It is desirable to use a thin metal foil from the viewpoint of the energy density of the battery. However, an appropriate thickness should be selected from the viewpoint of the presence or absence of pinholes and the strength of the exterior material. For example, in the case of aluminum, the thickness is desirably 30 μm or more.
【００２６】外装体１０の集電体との対峙部の一方もし
くは両方を凹状に成形してもよい。前記対峙部を凹状に
加工することで接合部１２で外装体１０に隙間が空くこ
とがなく、溶接不良や樹脂による接着不良を低減するこ
とができる。One or both of the facing portions of the exterior body 10 facing the current collector may be formed in a concave shape. By forming the facing portion into a concave shape, a gap is not formed in the exterior body 10 at the joint portion 12, so that welding failure and bonding failure due to resin can be reduced.
【００２７】前記対峙部を電池組立て前に予め凹状に加
工することで、溶接の場合であれば接合部１２で外装体
１０同士の間に隙間が空くことがなくなり、溶接不良を
低減することができる。また、樹脂接着の場合であれ
ば、予め樹脂の厚みを考慮した隙間を形成できることか
ら接着時に樹脂が必要以上に潰れて流れたり、外装が無
理に歪み接合部の樹脂に剥がれ方向の応力が掛かった
り、接着不良を引き起こしたりすることを少なくでき
る。By machining the facing portion into a concave shape before assembling the battery, in the case of welding, no gap is formed between the exterior bodies 10 at the joint portion 12 in the case of welding, so that poor welding can be reduced. it can. In addition, in the case of resin bonding, since a gap can be formed in consideration of the thickness of the resin in advance, the resin may be crushed more than necessary at the time of bonding and may flow, or the exterior may be forcibly strained, and the resin in the peeling direction may be stressed in the peeling direction. And the occurrence of poor adhesion can be reduced.
【００２８】この凹状の形成方法には既存の従来技術を
用いることができる。例えば、成形金型によるプレス加
工が一般的である。形状は、発電要素収容部から見て凹
状であればよく、深さや寸法は特に限定されないが、集
電体を含めた発電要素の厚みや上述の封止方法の違いに
よる外装体１０同士に必要な隙間を考慮して発電要素と
外装体が面で接触できる寸法、形状にするとよい。An existing conventional technique can be used for this concave forming method. For example, press working with a molding die is common. The shape may be concave as viewed from the power generation element housing portion, and the depth and dimensions are not particularly limited, but are necessary for the exterior bodies 10 due to differences in the thickness of the power generation element including the current collector and the above-described sealing method. The size and shape may be such that the power generating element and the exterior body can come into contact with each other in a plane, taking into account a sufficient gap.
【００２９】また、成形方法によっては成形する際に図
１に示されるように外装体１０の凹状の発電要素収納部
を台形としたり、外装体１０を加工した際の屈曲部や集
電体の四隅が隣接する部分において曲面となしてもよ
く、成形方法に適した任意の設計とすればよい。In addition, depending on the molding method, the concave power generation element housing portion of the exterior body 10 may be formed into a trapezoidal shape as shown in FIG. 1 during molding, or a bent portion or a current collector may be formed when the exterior body 10 is processed. The four corners may be curved at adjacent portions, and any design suitable for the molding method may be used.
【００３０】外装体１０の開口部２０はチップとの接続
に利用されるもので、チップから出ている正負極端子の
間隔や、大きさ、また接続方法に応じた任意の大きさ、
面積にすればよい。The opening 20 of the exterior body 10 is used for connection with the chip, and has an arbitrary size according to the interval and size of the positive and negative terminals coming out of the chip, and the connection method.
What is necessary is just to make an area.
【００３１】ただし、水分は開口部２０の樹脂断面を通
って実装型リチウム電池内へ侵入することから、水分の
侵入を抑制するためにできるだけ開口部２０の樹脂断面
積は小さくすることが望ましい。そのため、開口部２０
の形状は樹脂断面積を最も小さくできる円形が好適とい
える。しかしながら、開口部２０の形状は特に限定され
るものではなく、他の加工条件や電池デザインなどを考
慮した任意の形状であっても差し支えない。However, since water penetrates into the mounted lithium battery through the resin cross section of the opening 20, it is desirable that the resin cross section of the opening 20 be as small as possible to suppress the penetration of water. Therefore, the opening 20
It can be said that a preferable shape is a circle which can minimize the resin cross-sectional area. However, the shape of the opening 20 is not particularly limited, and may be an arbitrary shape in consideration of other processing conditions, battery design, and the like.
【００３２】開口部２０の形成方法には既存の従来技術
を用いることができる。例えば、成形金型による打抜き
やレーザーなどによる切抜きである。As a method of forming the opening 20, an existing conventional technique can be used. For example, punching using a molding die or cutting using a laser is used.
【００３３】発電要素の構成部材である正極１３、負極
１４、電解質１５の構成部材、つまり活物質や導電剤、
結着材、あるいは電解質などの構成材料や組成は限定さ
れるものではなく、従来のリチウム電池で使用可能なす
べての材料とその組み合わせが使用できる。また、発電
要素の作製方法も従来のリチウム電池で行われている手
法が全て適用できるほか、活物質を焼き固めた新たな焼
結体電極も適用可能である。The constituent members of the positive electrode 13, the negative electrode 14, and the electrolyte 15, which are constituent members of the power generating element, that is, an active material, a conductive agent,
The constituent materials and compositions such as the binder and the electrolyte are not limited, and all materials usable in conventional lithium batteries and combinations thereof can be used. In addition, all the methods used in the conventional lithium battery can be applied to the method of manufacturing the power generation element, and a new sintered body electrode obtained by sintering the active material is also applicable.
【００３４】また、正極集電体１６ならびに負極集電体
１７には外装体１０と同様の金属箔を用いることができ
る。金属箔の厚みは、電池のエネルギー密度の観点から
薄いものを用いるのが望ましいが、電池に補強板として
の機能を付与する観点から材質ごとに適当な厚みが選択
される。例えば、アルミニウムの場合２０μｍ以上とす
ることが望ましい。なお、集電体の材質の選定はそれぞ
れの電極の動作電圧範囲などを考慮して選択されればよ
く、必ずしも同じ材質、厚みである必要はない。The positive electrode current collector 16 and the negative electrode current collector 17 can be made of the same metal foil as that of the outer package 10. It is desirable to use a thin metal foil from the viewpoint of the energy density of the battery, but an appropriate thickness is selected for each material from the viewpoint of providing the battery with a function as a reinforcing plate. For example, in the case of aluminum, the thickness is preferably 20 μm or more. Note that the material of the current collector may be selected in consideration of the operating voltage range of each electrode and the like, and does not necessarily have to be the same material and thickness.
【００３５】発電要素を直列に多層積層して用いる場合
には各発電要素間に金属箔を配置し、さらに発電要素と
金属箔の固定と積層体の強度向上を目的として金属箔と
発電要素の電極とを導電性接着剤で接着した。When the power generating elements are used in a multi-layer stack in series, a metal foil is arranged between the power generating elements, and the metal foil and the power generating element are fixed for the purpose of fixing the power generating elements and the metal foil and improving the strength of the laminate. The electrodes were bonded with a conductive adhesive.
【００３６】正極１３と正極集電体１６あるいは負極１
４と負極集電体１７などの接着に用いられる導電性接着
剤１８には、金、銀、アルミニウムなどの金属粉やカー
ボンを分散させた市販の導電性接着剤を用いることがで
きる。特に、接着形態が面接着のため溶剤の揮発が難し
いので（株）スリーボンド社製３３１５Ｅのように塗
布、乾燥後、加熱加圧接着することにより接着できるタ
イプが望ましい。The positive electrode 13 and the positive electrode current collector 16 or the negative electrode 1
As the conductive adhesive 18 used to bond the negative electrode 4 to the negative electrode current collector 17, a commercially available conductive adhesive in which metal powder such as gold, silver, and aluminum or carbon is dispersed can be used. In particular, since the solvent is difficult to volatilize due to surface bonding, it is preferable to use a type such as 3315E manufactured by Three Bond Co., Ltd., which can be applied by applying, drying and then applying heat and pressure.
【００３７】正極集電体１６と外装体１０を接着する絶
縁性樹脂１９には、変性ポリエチレンや変性ポリプロピ
レンからなる絶縁性熱融着樹脂を用いるのが好適であ
る。これら熱融着性樹脂であれば接着時に溶剤が揮発し
実装型リチウム電池内に溶剤が残留することもなく、ま
た、外部からの短時間の加圧加熱で接着できることから
生産性にも優れている。As the insulating resin 19 for bonding the positive electrode current collector 16 and the package 10, it is preferable to use an insulating heat-sealing resin made of modified polyethylene or modified polypropylene. With these heat-fusible resins, the solvent does not volatilize during bonding and the solvent does not remain in the mounted lithium battery, and it is also excellent in productivity because it can be bonded by short-time pressurized heating from the outside. I have.
【００３８】発電要素を収容した外装体１０の周縁部３
辺（接合部１２）の接着には、レーザー溶接や抵抗溶接
などの溶接法、熱融着性樹脂や樹脂製接着剤を用いた接
着法など既存の接合方法を用いることができる。接合部
１２については、折返し部１１で正極側と負極側の外装
体１０の導通が確保されているため特に導通を確保する
必要はない。[0038] Peripheral portion 3 of exterior body 10 accommodating a power generating element
An existing joining method such as a welding method such as laser welding or resistance welding, or an adhesion method using a heat-fusible resin or a resin adhesive can be used for bonding the side (joining portion 12). Regarding the joint portion 12, since conduction between the positive electrode side and the negative electrode side exterior body 10 is ensured at the folded portion 11, it is not particularly necessary to ensure conduction.
【００３９】かくして本発明の実装型リチウム電池にお
いては、正極集電体１６ならびに負極集電体１７を導電
性接着剤１８によって接着し、その上で、さらに外装体
１０を二つ折りに成し、一方の外装部分を絶縁性樹脂１
９を介して正極集電体１６上に接着させたことで、半導
体装置に搭載しても、従来のように補強板を使用しない
ことから、その厚みを小さくしながらも、その曲げを防
止でき、その結果、信頼性を高めることができた。Thus, in the mounting type lithium battery of the present invention, the positive electrode current collector 16 and the negative electrode current collector 17 are bonded by the conductive adhesive 18, and then the outer package 10 is folded in two. One exterior part is made of insulating resin 1
By bonding to the positive electrode current collector 16 through the intermediary line 9, the reinforcing plate is not used even when mounted on a semiconductor device as in the related art, so that the bending can be prevented while reducing the thickness. As a result, the reliability was improved.
【００４０】なお、本発明は上記の実施形態例に限ら
ず、本発明の要旨を逸脱しない範囲内で種々の変更や改
良等は何等差し支えない。例えば、上述の実施形態例で
は開口部２０と対峙する電極を正極１３としたが、これ
に代えて、開口部２０と対峙する電極を負極１４として
もよい。It should be noted that the present invention is not limited to the above-described embodiment, and various changes and improvements may be made without departing from the spirit of the present invention. For example, although the electrode facing the opening 20 is the positive electrode 13 in the above-described embodiment, the electrode facing the opening 20 may be the negative electrode 14 instead.
【００４１】[0041]
【実施例】正極活物質にＬｉＭｎ2Ｏ4を、負極活物質に
Ｌｉ4Ｔｉ5Ｏ12を用いることで、本発明に係るリチウム
電池を以下に示すようにして作製した。EXAMPLE A lithium battery according to the present invention was produced as follows by using LiMn2 O4 for the positive electrode active material and Li4 Ti5 O12 for the negative electrode active material.
【００４２】ＬｉＭｎ2Ｏ4とＬｉ4Ｔｉ5Ｏ12のそれぞれ
と低融点ガラス、ここでは１０Ｌｉ2Ｏ−２５Ｂ2Ｏ3−
１５ＳｉＯ2−５０ＺｎＯとを重量比８０：２０で乾式
混合し混合粉とした。この混合粉１００に対して成形助
剤のポリビニルブチラールが重量比で１０となるように
加え、さらにトルエンを加えてスラリーを調製した。Each of LiMn2O4 and Li4Ti5O12 and a low-melting glass, here 10Li2O-25B2O3-
Dry mixed with 15SiO2-50ZnO at a weight ratio of 80:20 to obtain a mixed powder. To this mixed powder 100, polyvinyl butyral as a molding aid was added in a weight ratio of 10 and toluene was further added to prepare a slurry.
【００４３】このスラリーをポリエチレンテレフタレー
ト（ＰＥＴ）フィルム上に塗布した後に乾燥させてシー
ト状に成形したものをロールプレスにより加圧圧縮成形
して、正極は厚さ０．２ｍｍ、負極は厚さ０．２ｍｍの
シートとした。それぞれのシートを金型で打ち抜き２０
ｍｍ角のシート状の正極および負極成形体を得た。This slurry was applied on a polyethylene terephthalate (PET) film, dried and formed into a sheet. The resulting sheet was press-compressed by a roll press, and the positive electrode was 0.2 mm thick and the negative electrode was 0 mm thick. .2 mm sheet. Each sheet is punched with a die 20
A sheet-shaped positive electrode and negative electrode molded body having a square shape of mm were obtained.
【００４４】これら成形体を大気中、５５０℃で加熱す
ることで１８ｍｍ角、厚さ０．１５ｍｍの正極１３と１
８ｍｍ角、厚さ０．１５ｍｍの負極１４を作製した。By heating these compacts at 550 ° C. in the air, positive electrodes 13 and 1 each having a size of 18 mm square and 0.15 mm thick were heated.
A negative electrode 14 having a size of 8 mm square and a thickness of 0.15 mm was produced.
【００４５】ここで、正極１３と負極１４にそれぞれ厚
さ２０μｍのチタン箔からなる同寸の集電体を（株）ス
リーボンド社製導電性接着剤３３１５Ｅを用いて接着し
た。Here, current collectors of the same size, each made of a titanium foil having a thickness of 20 μm, were bonded to the positive electrode 13 and the negative electrode 14 using a conductive adhesive 3315E manufactured by Three Bond Co., Ltd.
【００４６】電解質１５に用いるゲル電解質を次の方法
で作製した。先ず、プロピレンカーボネートにＬｉＢＦ
4を１ｍｏｌ／ｌになるように溶解して電解液を調製
し、そこへ電解液：ポリアクリロニトリルが重量比で３
０：７０になるようにポリアクリルニトリルを加え、加
熱しながら十分撹拌してゲル電解質溶液とした。このゲ
ル電解質溶液を２０ｍｍ角に裁断した不織布に含浸さ
せ、正極１３と負極１４で挟んで冷却させることにより
ゲル電解質を形成し、正極１３と負極１４との間に電解
質１５を介した発電要素を作製した。A gel electrolyte used for the electrolyte 15 was produced by the following method. First, LiBF was added to propylene carbonate.
4 was dissolved at a concentration of 1 mol / l to prepare an electrolytic solution. The electrolytic solution: polyacrylonitrile was added therein in a weight ratio of 3%.
Polyacrylonitrile was added so that the ratio became 0:70, and the mixture was sufficiently stirred while heating to obtain a gel electrolyte solution. This gel electrolyte solution is impregnated into a non-woven fabric cut into a square of 20 mm, and cooled by sandwiching between a positive electrode 13 and a negative electrode 14 to form a gel electrolyte. Produced.
【００４７】外装体１０には厚さ５０μｍのステンレス
箔を縦５０ｍｍ、横２５ｍｍに裁断したものを用いた。
開口部２０には、プレスによる打抜きで直径５ｍｍの穴
を開けた。また、開口部２０を有する正極集電体１６と
対峙する面をプレス成形により凹状に加工した。As the outer package 10, a 50 μm-thick stainless steel foil cut into a length of 50 mm and a width of 25 mm was used.
A hole having a diameter of 5 mm was formed in the opening 20 by punching with a press. The surface facing the positive electrode current collector 16 having the opening 20 was processed into a concave shape by press molding.
【００４８】このように成形した外装体１０の負極側平
面と負極集電体１７とを導電性接着剤１８ｃを用いて接
着した。次に折返し部１１で外装体１０を二つ折りにし
発電要素に被せ開口部２０を有する正極側平面と正極集
電体１６を熱融着性変性ポリプロピレンからなる絶縁性
樹脂で接着した。The negative electrode-side flat surface of the thus formed exterior body 10 and the negative electrode current collector 17 were bonded to each other using a conductive adhesive 18c. Next, the outer package 10 was folded in two at the folded portion 11 and placed on the power generating element, and the positive electrode side surface having the opening 20 and the positive electrode current collector 16 were bonded with an insulating resin made of heat-fusible modified polypropylene.
【００４９】最後に周縁部三辺からなる接合部１２をレ
ーザー溶接して図１に示した本発明にかかる実装型リチ
ウム電池を完成した。Finally, the joint portion 12 consisting of three peripheral edges was laser-welded to complete the mounted lithium battery according to the present invention shown in FIG.
【００５０】比較例として図２に示した基本構造を有す
る実装型リチウム電池を次の方法により作製した。As a comparative example, a mounted lithium battery having the basic structure shown in FIG. 2 was manufactured by the following method.
【００５１】実施例と同様にして正極４と負極５を作製
した。この正極４と負極５との間にゲル電解質溶液を含
浸した不織布を挟んで冷却し、ゲル電解質溶液を固化し
て発電要素とした。A positive electrode 4 and a negative electrode 5 were produced in the same manner as in the example. The non-woven fabric impregnated with the gel electrolyte solution was sandwiched between the positive electrode 4 and the negative electrode 5 and cooled, and the gel electrolyte solution was solidified to form a power generating element.
【００５２】第１の半体ケース１ならびに第２の半体ケ
ース２には厚さ５０μｍのステンレス箔を用い、いずれ
のケースも発電要素収納部を凹状に加工した。第１の半
体ケース１には直径５ｍｍの開口９を実施例と同様にし
て設けた。端子板７には厚さ３０μｍのステンレス箔を
用いた。第２の半体ケース２と端子板７を実施例１と同
じ導電性接着剤を用いて発電要素に接着した。次に端子
板７の外側の面を同じく実施例で用いた熱融着性変性ポ
リプロピレンからなる絶縁性樹脂８を用いて第１の半体
ケース１に接着した。The first half case 1 and the second half case 2 were made of stainless steel foil having a thickness of 50 μm, and in each case, the power generation element housing portion was processed into a concave shape. An opening 9 having a diameter of 5 mm was provided in the first half case 1 in the same manner as in the example. A 30 μm thick stainless steel foil was used for the terminal plate 7. The second half case 2 and the terminal plate 7 were bonded to the power generating element using the same conductive adhesive as in Example 1. Next, the outer surface of the terminal plate 7 was adhered to the first half case 1 using the insulating resin 8 made of the heat-fusible modified polypropylene similarly used in the example.
【００５３】第１および第２のケース半体１および２の
周縁部３をレーザー溶接して封止して比較例の実装型リ
チウム電池を完成した。 （評価）上記実施例で作製した実装型リチウム電池によ
れば、発電要素の両端に集電体が接着され、さらに一枚
の金属箔からなる外装体１０を用いているため、半導体
装置に搭載しても、曲がりにくくなった。The peripheral portions 3 of the first and second case halves 1 and 2 were sealed by laser welding to complete a mounted lithium battery of a comparative example. (Evaluation) According to the mounted lithium battery manufactured in the above embodiment, the current collectors are adhered to both ends of the power generation element, and the exterior body 10 made of one sheet of metal foil is used. Even so, it became difficult to bend.
【００５４】そこで、本発明者は塩化ビニル製のＩＣカ
ードに実装型リチウム電池とＩＣチップを実装し曲げ耐
久試験を行い、チップ破損の有無を確認した。The inventor of the present invention mounted a lithium battery and an IC chip on an IC card made of vinyl chloride and performed a bending durability test to confirm whether or not the chip was damaged.
【００５５】実施例および比較例で作製した実装型リチ
ウム電池を塩化ビニル製のＩＣカード基材縦８６ｍｍ、
横５４ｍｍ、厚さ０．７６ｍｍに実装し、縦方向から力
を加えＩＣカードをたわませては戻す操作を２０回繰り
返し、ＩＣチップの破損の有無を調べた。なお、試験に
は実施例および比較例と同様にして作製した実装型リチ
ウム電池それぞれ５個を用いた。The mounted lithium batteries produced in Examples and Comparative Examples were made of a vinyl chloride IC card base material having a length of 86 mm.
The mounting was performed 54 mm in width and 0.76 mm in thickness, and the operation of applying a force in the vertical direction to bend and return the IC card was repeated 20 times, and the presence or absence of damage to the IC chip was examined. In the test, five mounted lithium batteries manufactured in the same manner as in the example and the comparative example were used.
【００５６】上述の曲げ耐久試験を実施例と比較例それ
ぞれ５個の電池に対して行った結果、比較例の実装型リ
チウム電池では全てＩＣチップの破損が確認された。こ
れに対して、実施例の実装型リチウム電池を用いた場合
にはＩＣチップの破損は確認されなかった。As a result of performing the above-mentioned bending durability test on each of the five batteries in each of the example and the comparative example, it was confirmed that all the mounted lithium batteries of the comparative example were damaged in the IC chip. On the other hand, when the mounted lithium battery of the example was used, no breakage of the IC chip was confirmed.
【００５７】この結果の差は発電要素に対して集電体が
しっかりと接着され、かつ外装体が1枚の金属箔二つ折
りにして形成されているためであると考えられる。It is considered that the difference between the results is due to the fact that the current collector is firmly adhered to the power generating element, and the exterior body is formed by folding one metal foil in two.
【００５８】このように本発明にかかる実装型リチウム
電池の構造においては、実装型リチウム電池の機械的強
度を飛躍的に向上させるものである。As described above, in the structure of the mountable lithium battery according to the present invention, the mechanical strength of the mountable lithium battery is dramatically improved.
【００５９】なお、本発明においては、発電要素を直列
に多層具備した実装型リチウム電池でも本発明の構造を
採れば、同様の効果が得られることは明らかである。In the present invention, it is apparent that the same effect can be obtained by adopting the structure of the present invention even in a mounted lithium battery having a plurality of power generating elements in series.
【００６０】[0060]
【発明の効果】以上の通り、本発明の実装型リチウム電
池によれば、金属箔からなる外装体の内側に正極と負極
との間に電解質を配設してなる発電要素を配設した電池
構造において、正極および負極のそれぞれの外側に金属
箔からなる集電体が導電性接着剤により接着され、さら
に集電体を露出すべく金属箔に開口部が設けられた外装
体を二つ折りに成し、一方の外装部分を絶縁性樹脂を介
して当該集電体上に接着せしめたことで、半導体装置の
厚みを小さくしながらも、その曲げを防止でき、これに
よって信頼性を高めた低コスト化の実装型リチウム電池
が提供できた。As described above, according to the mountable lithium battery of the present invention, a battery in which a power generating element having an electrolyte disposed between a positive electrode and a negative electrode is provided inside a package made of metal foil. In the structure, a current collector made of a metal foil is adhered to the outside of each of the positive electrode and the negative electrode with a conductive adhesive, and furthermore, the exterior body provided with an opening in the metal foil to expose the current collector is folded in two. By bonding one of the exterior parts to the current collector via an insulating resin, the bending of the semiconductor device can be prevented while reducing the thickness of the semiconductor device, thereby improving reliability. A cost-effective mounted lithium battery was provided.
【図１】本発明の実装型リチウム電池の断面図である。FIG. 1 is a sectional view of a mounted lithium battery according to the present invention.
【図２】従来の実装型リチウム電池の断面図である。FIG. 2 is a cross-sectional view of a conventional mounted lithium battery.
【図３】従来の半導体装置の断面図である。FIG. 3 is a cross-sectional view of a conventional semiconductor device.
１…第１の半体ケース、２…第２の半体ケース、３…周
縁部、４…第１の電極、５…第２の電極、６…セパレー
タ、７…端子板、８…絶縁性樹脂、９…開口１０…外装
体、１１…折り返し部、１２…接合部、１３…正極、１
４…負極、１５は…電解質、１６…正極集電体、１７…
負極集電体、１８…導電性接着剤、１９…絶縁性樹脂、
２０…開口部DESCRIPTION OF SYMBOLS 1 ... 1st half case, 2 ... 2nd half case, 3 ... Peripheral part, 4 ... 1st electrode, 5 ... 2nd electrode, 6 ... Separator, 7 ... Terminal plate, 8 ... Insulation Resin, 9 ... Opening 10 ... Outer body, 11 ... Folded part, 12 ... Joint part, 13 ... Positive electrode, 1
4 ... negative electrode, 15 ... electrolyte, 16 ... positive electrode current collector, 17 ...
Negative electrode current collector, 18: conductive adhesive, 19: insulating resin,
20 ... Opening
Claims (1)
との間に電解質を配設してなる発電要素を配設した実装
型リチウム電池であって、正極および負極のそれぞれの
外側に金属箔からなる集電体が導電性接着剤により接着
され、さらに集電体を露出すべく金属箔に開口部が設け
られた前記外装体を二つ折りに成し、一方の外装部分を
絶縁性樹脂を介して当該集電体上に接着せしめたことを
特徴とする実装型リチウム電池。1. A mounted lithium battery having a power generating element in which an electrolyte is disposed between a positive electrode and a negative electrode inside an exterior body made of a metal foil, wherein the power generating element is disposed outside each of the positive electrode and the negative electrode. A current collector made of a metal foil is adhered by a conductive adhesive, and the outer body provided with an opening in the metal foil to expose the current collector is folded in two, and one of the outer parts is insulated. A mounted lithium battery which is adhered on the current collector via a resin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000219592A JP2002042885A (en) | 2000-07-19 | 2000-07-19 | Mounting type lithium battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000219592A JP2002042885A (en) | 2000-07-19 | 2000-07-19 | Mounting type lithium battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2002042885A true JP2002042885A (en) | 2002-02-08 |
Family
ID=18714346
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000219592A Pending JP2002042885A (en) | 2000-07-19 | 2000-07-19 | Mounting type lithium battery |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2002042885A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011181531A (en) * | 2011-06-24 | 2011-09-15 | Panasonic Corp | Energy device and method of manufacturing the same |
| JP2013191365A (en) * | 2012-03-13 | 2013-09-26 | Toyota Industries Corp | Power storage device and vehicle |
| CN107946650A (en) * | 2016-10-13 | 2018-04-20 | 辉能科技股份有限公司 | Battery structure |
| JP2019164892A (en) * | 2018-03-19 | 2019-09-26 | トヨタ自動車株式会社 | All-solid battery |
-
2000
- 2000-07-19 JP JP2000219592A patent/JP2002042885A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011181531A (en) * | 2011-06-24 | 2011-09-15 | Panasonic Corp | Energy device and method of manufacturing the same |
| JP2013191365A (en) * | 2012-03-13 | 2013-09-26 | Toyota Industries Corp | Power storage device and vehicle |
| CN107946650A (en) * | 2016-10-13 | 2018-04-20 | 辉能科技股份有限公司 | Battery structure |
| CN107946650B (en) * | 2016-10-13 | 2020-12-04 | 辉能科技股份有限公司 | Battery structure |
| JP2019164892A (en) * | 2018-03-19 | 2019-09-26 | トヨタ自動車株式会社 | All-solid battery |
| JP7003762B2 (en) | 2018-03-19 | 2022-01-21 | トヨタ自動車株式会社 | All solid state battery |
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