JP2001351685A - Manufacturing method of thin cell - Google Patents
Manufacturing method of thin cellInfo
- Publication number
- JP2001351685A JP2001351685A JP2000169868A JP2000169868A JP2001351685A JP 2001351685 A JP2001351685 A JP 2001351685A JP 2000169868 A JP2000169868 A JP 2000169868A JP 2000169868 A JP2000169868 A JP 2000169868A JP 2001351685 A JP2001351685 A JP 2001351685A
- Authority
- JP
- Japan
- Prior art keywords
- electrode plate
- separator
- core
- thermoplastic resin
- 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
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
- Secondary Cells (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、薄型電池、特に
小型電子機器に内蔵される電池の製造方法に属する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a thin battery, particularly a battery built in a small electronic device.
【０００２】[0002]
【従来の技術】携帯用無線電話、携帯用パソコン、携帯
用ビデオカメラ等の小型電子機器が普及している。これ
らの電子機器に内蔵されるリチウムイオン電池などの電
池は、従来より、金属樹脂ラミネートフィルムからな
り、フィルムの縁部同士を溶着することにより気密に形
成される電池容器と、この中に収納される蓄電要素と、
蓄電要素に接続されるとともに、電池容器外に露出する
リードとを備えた電池が使用されている。2. Description of the Related Art Small electronic devices such as portable radio telephones, portable personal computers, and portable video cameras have become widespread. Conventionally, batteries such as lithium-ion batteries incorporated in these electronic devices are made of a metal resin laminate film, and are hermetically formed by welding the edges of the film together with a battery container housed therein. Power storage element,
A battery having a lead connected to a power storage element and exposed outside a battery container is used.
【０００３】蓄電要素は、正極板、セパレータ及び負極
板からなる。正極板は、例えばアルミニウム箔などから
なる正極集電体にリチウムコバルト複合酸化物、リチウ
ムニッケル複合酸化物などの正極活物質層が形成された
ものである。負極板は、例えば銅箔などからなる負極集
電体に炭素粉末などの負極活物質層が形成されたもので
ある。セパレータは、通常は多孔性の有機高分子膜から
なる。そして、これら蓄電要素は、セパレータが電極間
に介在するようにして重ねられて渦状に巻かれた状態で
上記の電池容器に収納される。一般に電池は、電極間距
離が面方向に均一であるとき、電極全体で電池反応が均
等に進行し長寿命が期待できる。[0003] The electricity storage element comprises a positive electrode plate, a separator and a negative electrode plate. The positive electrode plate is obtained by forming a positive electrode active material layer such as a lithium cobalt composite oxide or a lithium nickel composite oxide on a positive electrode current collector made of, for example, an aluminum foil. The negative electrode plate is obtained by forming a negative electrode active material layer such as a carbon powder on a negative electrode current collector made of, for example, a copper foil. The separator is usually made of a porous organic polymer film. These power storage elements are housed in the above-described battery container in a state where the power storage elements are stacked so as to be interposed between the electrodes and are spirally wound. Generally, in a battery, when the distance between the electrodes is uniform in the plane direction, the battery reaction proceeds uniformly over the entire electrode, and a long life can be expected.
【０００４】[0004]
【発明が解決しようとする課題】しかし、上記のように
電池容器が金属樹脂ラミネートフィルムからなる場合、
電池容器の耐圧性が乏しいので、容器の圧迫力のみでは
電極間距離を均一に保つことができず、その結果、充電
放電サイクル時に著しく容量が低下する。それ故、この
発明の課題は、エネルギー密度が高くサイクル特性の優
れた薄型電池の効率よい製造方法を提供することにあ
る。However, when the battery container is made of a metal resin laminate film as described above,
Since the pressure resistance of the battery container is poor, the distance between the electrodes cannot be kept uniform only by the pressing force of the container, and as a result, the capacity is significantly reduced during a charge / discharge cycle. Therefore, an object of the present invention is to provide a method for efficiently manufacturing a thin battery having high energy density and excellent cycle characteristics.
【０００５】[0005]
【課題を解決するための手段】その課題を解決するため
に、この発明の薄型電池の製造方法は、一方が正極、他
方が負極となる第一、第二の電極板と、多孔性のセパレ
ータとを有し、それら電極板とセパレータとが重ね合わ
せられて芯に巻き付けた後、その芯を取り除く薄型電池
の製造方法において、第一の電極板の両面に熱可塑性樹
脂層を介してセパレータを配し、第二の電極板の両面に
熱可塑性樹脂層を形成し、第二の電極板と芯との間に第
一の電極板及びセパレータからなる積層体が存在するよ
うに巻き付けることを特徴とする。In order to solve the problem, a method of manufacturing a thin battery according to the present invention comprises a first and a second electrode plate, one of which is a positive electrode and the other is a negative electrode, and a porous separator. After the electrode plate and the separator are superimposed and wound around a core, in a method of manufacturing a thin battery for removing the core, the separator is provided on both surfaces of the first electrode plate via a thermoplastic resin layer. Arranged, a thermoplastic resin layer is formed on both sides of the second electrode plate, and wrapped so that a laminate composed of the first electrode plate and the separator exists between the second electrode plate and the core. And
【０００６】この発明の電池では、上記のように第一の
電極板とセパレータとを熱可塑性樹脂層にて接着してい
るので、第一の電極板とセパレータとの間隔は一定に保
たれる。又、第二の電極板の両面に熱可塑性樹脂層が形
成されているので、これを第一電極板及びセパレータか
らなる積層体と重ねると、第二の電極板の両面の熱可塑
性樹脂層を介して第二の電極板とセパレータが接着され
る。従って、第二の電極板とセパレータとの間隔も一定
となる。その結果、容器の圧迫力にかかわらず電極間距
離は一定である。In the battery of the present invention, since the first electrode plate and the separator are bonded by the thermoplastic resin layer as described above, the distance between the first electrode plate and the separator is kept constant. . Also, since a thermoplastic resin layer is formed on both surfaces of the second electrode plate, if this is overlapped with a laminate composed of the first electrode plate and the separator, the thermoplastic resin layers on both surfaces of the second electrode plate will be formed. The second electrode plate and the separator are bonded through the intermediary. Therefore, the distance between the second electrode plate and the separator is also constant. As a result, the distance between the electrodes is constant regardless of the compression force of the container.
【０００７】更に、第一電極板の両面には熱可塑性樹脂
層を介してセパレータが接着されているので、その積層
体の両外面には接着膜が存在しない。そのため、第二の
電極板と芯との間に第一の電極板及びセパレータからな
る積層体が存在するように巻き付けることにより、巻き
付け終了後に芯を容易に取り除くことができる。このよ
うに第二の電極板と芯との間に上記の積層体が存在する
ように巻き付けるためには、通常は、積層体を内側、第
二電極板を外側にして巻き付けるだけでよい。Further, since the separators are bonded to both surfaces of the first electrode plate via the thermoplastic resin layers, there is no adhesive film on both outer surfaces of the laminate. Therefore, by winding so that the laminate composed of the first electrode plate and the separator exists between the second electrode plate and the core, the core can be easily removed after the completion of the winding. In order to wind the laminate so that the laminate is present between the second electrode plate and the core, it is usually sufficient to wind the laminate with the laminate inside and the second electrode plate outside.
【０００８】しかし、巻き付けを容易にするために芯の
本数を２とし、先ず２本の芯の間に第一電極板、セパレ
ータ及び第二電極板を挟んで固定する場合がある。この
ような場合、第一電極板及びセパレータからなる積層体
をある長さＬ分、例えば２本の芯で挟まれる部分だけ先
に巻き付け、その後その外側に第二電極板を重ねて巻き
付けるとよい。このようにすると、積層体の長さＬ分が
２本の芯で確実に固定されるからである。しかも２本の
芯の外周面と１周目の第二電極板との間に１周目の積層
体が存在するので、第二電極板と芯とが接着せず、その
ため巻き付け終了後に芯を一層容易に取り除くことがで
きるからである。However, there are cases where the number of cores is set to two in order to facilitate winding, and the first electrode plate, the separator and the second electrode plate are fixed between the two cores. In such a case, the laminate composed of the first electrode plate and the separator may be wound first by a certain length L, for example, only at a portion sandwiched between two cores, and then the second electrode plate may be wound around the outside thereof. . This is because the length L of the laminate is securely fixed by the two cores. In addition, since the first-layer laminate exists between the outer peripheral surfaces of the two cores and the first-electrode second electrode plate, the second electrode plate and the core do not adhere to each other. This is because it can be more easily removed.
【０００９】[0009]
【実施形態】この発明の薄型電池の製造方法の実施形態
を図面と共に説明する。図１は実施形態の薄型電池の蓄
電要素を芯に巻き付けている状態を示す断面図、図２は
図１のＡ部拡大図、図３は図１のＢ部拡大図である。蓄
電要素は、アルミニウム箔などの金属箔からなる集電体
の両面にリチウムコバルト複合酸化物からなる活物質層
が形成された正極板１と、銅箔などの金属箔からなる集
電体の両面に炭素からなる活物質層が形成された負極板
２と、ポリエチレンシートなどからなる多孔性のセパレ
ータ３とを有する。２本の芯４は金属製である。DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the method for manufacturing a thin battery according to the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view showing a state in which a power storage element of a thin battery according to an embodiment is wound around a core, FIG. 2 is an enlarged view of a portion A in FIG. 1, and FIG. 3 is an enlarged view of a portion B in FIG. The power storage element includes a positive electrode plate 1 in which an active material layer made of a lithium-cobalt composite oxide is formed on both surfaces of a current collector made of a metal foil such as an aluminum foil, and both surfaces of a current collector made of a metal foil such as a copper foil. A negative electrode plate 2 on which an active material layer made of carbon is formed, and a porous separator 3 made of a polyethylene sheet or the like. The two cores 4 are made of metal.
【００１０】この蓄電要素を芯に巻き付ける手順は次の
通りである。負極板２の両面に熱可塑性樹脂層５を形成
し、セパレータ３を負極板２のほぼ全面に貼り付けてセ
パレータ３／負極板２／セパレータ３からなる積層体６
を作製する。熱可塑性樹脂層は、例えば熱可塑性樹脂と
セラミック粉末などの固形フィラーとの混合物からなる
薄い膜であり、微視的には固形フィラーの周囲に熱可塑
性樹脂が付着していて固形フィラー同士の間隙によって
多孔性が得られると同時に熱可塑性樹脂によって接着性
を有するものである。The procedure for winding the electricity storage element around the core is as follows. A thermoplastic resin layer 5 is formed on both surfaces of the negative electrode plate 2, and a separator 3 is attached to almost the entire surface of the negative electrode plate 2 to form a laminate 6 of separator 3 / negative electrode plate 2 / separator 3
Is prepared. The thermoplastic resin layer is a thin film made of, for example, a mixture of a thermoplastic resin and a solid filler such as a ceramic powder.Microscopically, the thermoplastic resin adheres to the periphery of the solid filler and a gap between the solid fillers is formed. Thus, porosity can be obtained at the same time, and at the same time, adhesiveness can be obtained by a thermoplastic resin.
【００１１】別途、正極板１の両面にも熱可塑性樹脂層
７を形成し、待機させておく。そして、２本の芯４の間
に積層体６を挟んで芯４の半周分だけ巻く。次にその積
層体６の外側に熱可塑性樹脂層７の付いた正極板１を重
ね合わせて積層体６とともに２本の芯４の外周に渦状に
巻き付ける。巻き終わった後、蓄電要素から２本の芯４
を軸方向に引き抜き又は押し出すことによって芯４を取
り除く。２本の芯４にはそれらの内側（２本の芯の対向
面）にも外側にも熱可塑性樹脂層５、７が接していない
ので、引き抜きにしても押し出しにしても芯４を容易に
取り出すことができる。その後、この蓄電要素を電池容
器に収納し、電解液を注入し、封口することによって薄
型電池が完成する。Separately, a thermoplastic resin layer 7 is formed on both sides of the positive electrode plate 1 and is kept on standby. Then, the laminate 6 is wound between the two cores 4 by half a circumference of the core 4. Next, the positive electrode plate 1 having the thermoplastic resin layer 7 attached to the outside of the laminate 6 is superimposed, and wound together with the laminate 6 around the outer periphery of the two cores 4 in a spiral. After winding, two cores 4
The core 4 is removed by axially pulling out or pushing out. Since the thermoplastic resin layers 5 and 7 are not in contact with the two cores 4 on the inside (opposing surfaces of the two cores) or on the outside, the cores 4 can be easily pulled out or extruded. Can be taken out. Thereafter, the storage element is housed in a battery container, an electrolytic solution is injected, and the battery is sealed to complete a thin battery.
【００１２】尚、熱可塑性樹脂層５、７に用いる前記熱
可塑性樹脂としては、乳化重合したポリビニリデンフル
オライド（ＰＶｄＦ）とヘキサフルオロプロピレンとの
共重合体が挙げられ、前記固形フィラーとしては一次粒
径１０〜２０ｎｍのセラミック粉末、例えばアルミナ粉
末が挙げられる。いずれも耐有機電解液性に優れるから
である。熱可塑性樹脂層に適用可能な他の熱可塑性樹脂
としては、上記ＰＶｄＦ、ポリエチレンオキシド（ＰＥ
Ｏ）、ポリアクリロニトリル（ＰＡＮ）などが挙げられ
る。The thermoplastic resin used for the thermoplastic resin layers 5 and 7 may be a copolymer of emulsion-polymerized polyvinylidene fluoride (PVdF) and hexafluoropropylene, and the solid filler may be a primary filler. A ceramic powder having a particle size of 10 to 20 nm, for example, an alumina powder may be used. This is because each of them is excellent in organic electrolyte solution resistance. Other thermoplastic resins applicable to the thermoplastic resin layer include the above-mentioned PVdF, polyethylene oxide (PE)
O) and polyacrylonitrile (PAN).
【００１３】[0013]
【発明の効果】以上の通り、この発明の製造方法によれ
ば、電極間距離が一定に保たれた薄型電池を容易に製造
することができるので、生産効率が向上する。As described above, according to the manufacturing method of the present invention, it is possible to easily manufacture a thin battery in which the distance between the electrodes is kept constant, thereby improving the production efficiency.
【図１】実施形態の薄型電池の製造方法を示す断面図で
ある。FIG. 1 is a cross-sectional view illustrating a method for manufacturing a thin battery according to an embodiment.
【図２】図１のＡ部拡大図である。FIG. 2 is an enlarged view of a portion A in FIG.
【図３】図１のＢ部拡大図である。FIG. 3 is an enlarged view of a portion B in FIG. 1;
１ 正極板 ２ 負極板 ３ セパレータ ４ 芯 ５、７ 熱可塑性樹脂層 ６ 積層体 Reference Signs List 1 positive electrode plate 2 negative electrode plate 3 separator 4 core 5, 7 thermoplastic resin layer 6 laminate
───────────────────────────────────────────────────── フロントページの続き (72)発明者 原田 泰志 京都府京都市南区吉祥院新田壱ノ段町５番 地 ジーエス・メルコテック株式会社内 Ｆターム(参考） 5H029 AJ05 AJ14 AK03 AL06 AM01 BJ02 BJ14 CJ06 CJ07 DJ04 DJ13 EJ08 EJ12 EJ14 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yasushi Harada F-term (reference) 5G029 AJ05 AJ14 AK03 AL06 AM01 BJ02 BJ14 5 GS Melcotec Co., Ltd. CJ06 CJ07 DJ04 DJ13 EJ08 EJ12 EJ14
Claims (1)
の電極板と、多孔性のセパレータとを有し、それら電極
板とセパレータとが重ね合わせられて芯に巻き付けた
後、その芯を取り除く薄型電池の製造方法において、 第一の電極板の両面に熱可塑性樹脂層を介してセパレー
タを配し、第二の電極板の両面に熱可塑性樹脂層を形成
し、第二の電極板と芯との間に第一の電極板及びセパレ
ータからなる積層体が存在するように巻き付けることを
特徴とする薄型電池の製造方法。A first electrode plate having a positive electrode and a second electrode plate having a negative electrode; and a porous separator, wherein the electrode plate and the separator are overlapped and wound around a core. In a method of manufacturing a thin battery for removing the core, a separator is disposed on both surfaces of a first electrode plate via a thermoplastic resin layer, and a thermoplastic resin layer is formed on both surfaces of a second electrode plate. A method for manufacturing a thin battery, comprising: winding a laminate including a first electrode plate and a separator between an electrode plate and a core.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000169868A JP2001351685A (en) | 2000-06-07 | 2000-06-07 | Manufacturing method of thin cell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000169868A JP2001351685A (en) | 2000-06-07 | 2000-06-07 | Manufacturing method of thin cell |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2001351685A true JP2001351685A (en) | 2001-12-21 |
Family
ID=18672662
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000169868A Pending JP2001351685A (en) | 2000-06-07 | 2000-06-07 | Manufacturing method of thin cell |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2001351685A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006269424A (en) * | 2005-03-23 | 2006-10-05 | Samsung Sdi Co Ltd | Electrode assembly for lithium ion battery and lithium ion battery using it |
| JP2016181396A (en) * | 2015-03-24 | 2016-10-13 | 株式会社Ｇｓユアサ | Winding device, method of manufacturing power storage element and power storage element |
-
2000
- 2000-06-07 JP JP2000169868A patent/JP2001351685A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006269424A (en) * | 2005-03-23 | 2006-10-05 | Samsung Sdi Co Ltd | Electrode assembly for lithium ion battery and lithium ion battery using it |
| JP4628981B2 (en) * | 2005-03-23 | 2011-02-09 | 三星エスディアイ株式会社 | Lithium ion battery electrode assembly and lithium ion battery using the same |
| JP2016181396A (en) * | 2015-03-24 | 2016-10-13 | 株式会社Ｇｓユアサ | Winding device, method of manufacturing power storage element and power storage element |
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