JP2003168400A - Battery - Google Patents
BatteryInfo
- Publication number
- JP2003168400A JP2003168400A JP2001368897A JP2001368897A JP2003168400A JP 2003168400 A JP2003168400 A JP 2003168400A JP 2001368897 A JP2001368897 A JP 2001368897A JP 2001368897 A JP2001368897 A JP 2001368897A JP 2003168400 A JP2003168400 A JP 2003168400A
- Authority
- JP
- Japan
- Prior art keywords
- container
- generating element
- battery
- power generating
- power generation
- 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)
Abstract
Description
【発明の詳細な説明】
【０００１】
【発明の属する技術分野】本発明は、電池に属する。本
発明は、特に、ポータブル機器に内蔵されるリチウムイ
オン二次電池に好適に適用される。
【０００２】
【従来の技術】携帯電話などのポータブル機器に内蔵さ
れる電池として、エネルギー密度の高いリチウムイオン
二次電池が多く使用される。従来より、リチウムイオン
二次電池の発電要素は、コバルト酸リチウム等の活物質
材料が金属箔に塗布されてなる正極板と、リチウムを吸
蔵・放出可能なホスト物質が金属箔に塗布されてなる負
極板と、両極板の間にあってこれらを隔てつつ電解液を
保持するセパレータとを有し、これらが積層され巻回さ
れることによって長円状に形成されている。発電要素
は、一方に開口した角形の容器に収納され、その容器の
開口は蓋により封じられる。
【０００３】発電要素の向きについては、例えば、その
巻回軸が容器の底と垂直になるように収納される。また
巻回軸が容器の底と平行になるように、即ち発電要素の
湾曲面の頂部が容器の底と接触するように収納される電
池も開示されている（特許公報第２６９２５３３号）。
この電池によると、発電要素が容器に挿入される際に、
破損するのを抑制することができる。
【０００４】
【発明が解決しようとする課題】しかし、従来の電池で
は、電池交換時などの必要時に、電池を機器から取り外
すのが容易でない。取り外しを容易にするために、爪を
引っ掛けることが可能な窪みを容器の外面に設けること
も考えられる。だが、電池の軽量化を図るため、通常、
容器の肉厚は薄くしている。よって、容器外面に窪みを
形成させると、容器内においてその窪み部分が容器内面
よりも突出するのを避けることができない。そのため、
発電要素が窪み部分に当たってしまい、その結果、発電
要素の損傷をもたらす。それ故、本発明の課題は、機器
からの取り外しが容易であり、しかも発電要素の損傷を
防ぐことが可能な電池を提供することにある。
【０００５】
【課題を解決するための手段】本発明の電池は、正極板
及び負極板をセパレータを介して積層し、長円状に巻回
してなる扁平な発電要素と、一方に開口した角形をな
し、底に発電要素の湾曲面の頂部が接触するように発電
要素を収納する容器と、容器の開口を封じる蓋とを備え
る電池において、容器の底外面に底内面よりも内側にま
で凹んだ窪みが形成されており、窪みの深さをｈ、発電
要素の厚さを２ｔ、発電要素の厚さ方向中心線から窪み
までの距離をｄとするとき、ｈ＜ｔ−（ｔ2−ｄ2）1/2
の関係を満たすことを特徴とする。
【０００６】本発明では、容器の底外面に窪みが形成さ
れているので、その窪みに爪などを引っ掛けることによ
って、機器から電池を容易に取り外すことができる。ま
た、発電要素は長円状に巻回されているので、発電要素
の厚さを２ｔとするとき、発電要素の湾曲面は断面視に
おいて半径ｔの円弧状をなす。さらに、発電要素は、容
器の底と発電要素の湾曲面の頂部とが接触するように容
器に収納されている。よって、発電要素の厚さ方向中心
線から距離ｄだけ離れた位置における容器の底から発電
要素湾曲面までの距離は、ｔ−（ｔ2−ｄ2）1/2と表さ
れる。ここで本発明では、窪みの深さｈは、ｈ＜ｔ−
（ｔ2−ｄ2）1/2の関係を満たし、発電要素湾曲面まで
の距離よりも短くしている。従って、この電池による
と、発電要素が窪み部分に当たって損傷するのを防ぐこ
とができる。
【０００７】本発明において、容器に窪みを形成される
方法については、特に限定はない。容器の成形と同時に
窪みが形成されるようにしても良いし、容器の成形後に
窪みを加工しても良い。容器の厚さの内寸は、発電要素
の厚さ２ｔとほぼ等しいことが望ましい。この場合、発
電要素の両主面がそれぞれ容器の内面と接触し、容器内
に無駄な空間を作らずに済む。尚、この場合、発電要素
の厚さ方向中心線は、容器の厚さ方向中心線と一致す
る。
【０００８】本発明の電池は、リチウムイオン二次電池
として好適に適用されうる。リチウムイオン二次電池の
とき、発電要素の正極板にはコバルト酸リチウム等の活
物質材料が塗布された金属箔を、負極板には炭素材料等
のホスト物質が塗布された金属箔を使用することができ
る。セパレータとしては、ポリエチレン、ポリプロピレ
ン等の樹脂からなる微多孔フィルムを使用するのが好ま
しい。セパレータには、例えばハロゲン系リチウム塩を
含有する非水電解液を保持させると良い。容器及び蓋の
材料は、アルミニウム等の金属が望ましい。また蓋には
１本の電池端子を貫通させると良い。そして、正負極板
の一方を電池端子に接続させ、他方を蓋又は容器に接続
させる。
【０００９】
【発明の実施の形態】本発明の実施形態を図面とともに
説明する。実施形態の電池の斜視図を図１に、厚さ方向
に切断した断面図を図２に、図２の底部拡大図を図３に
それぞれ示す。
【００１０】この電池１は、コバルト酸リチウム等の活
物質材料が金属箔に塗布されてなる正極板、非水電解液
を保持するセパレータ、及びリチウムを吸蔵・放出可能
なホスト物質が金属箔に塗布されてなる負極板により構
成される発電要素２を備える。正極板、セパレータ及び
負極板はいずれも帯状をなし、発電要素２は、これらを
順に積層して縦方向に折り畳みながら巻回することによ
って形成されている。そのため、発電要素２は長円状を
なしていて、また扁平である。
【００１１】発電要素２は、一方に開口した角形の容器
３に収納されている。容器３はアルミニウムからなり、
その厚さの内寸は発電要素２の厚さと等しい。また発電
要素２はその巻回軸が容器３の底３ａと平行になる向き
に収納されており、発電要素２の湾曲面２ａの頂部２ｂ
は容器３の底３ａ内面と接触する。容器３の開口にはア
ルミニウム製の蓋４がレーザー溶接されており、これに
より容器３が密封されている。蓋４の中央部には貫通孔
が開けられていて、その貫通孔には負極端子５が絶縁性
パッキン６とともに挿入されている。そして、発電要素
２の負極板はその負極端子５の下端と接続し、正極板は
蓋４の下面と接続している。
【００１２】容器の底３ａ外面の隅には、２箇所におい
て方形の窪み３ｂが形成されている。各窪み３ｂは底３
ａの内面よりも深く凹んでいるが、その深さｈは、同じ
位置における底３ａ内面から発電要素湾曲面２ａまでの
距離Ｈよりも短い。ここで、発電要素２の湾曲面２ａの
頂部２ｂは容器３の底３ａ内面と接触し、その湾曲面２
ａは円弧状をなす。よって、発電要素２の厚さを２ｔ、
発電要素２の厚さ方向中心線Ｃから窪み３ｂまでの距離
をｄとするとき、上記の距離Ｈはｔ−（ｔ2−ｄ2）1/2
となる。従って本実施形態では、ｈ＜ｔ−（ｔ2−ｄ2）
1/2の関係が満たされている。
【００１３】図４に斜視図として示すように、本実施形
態の電池１は携帯電話などの機器７に装着される。電池
１は電池交換時等の必要時に外されるが、この電池１に
は容器３の底３ａに窪み３ｂが設けられている。よっ
て、窪み３ｂに爪を引っ掛けることによって、電池１を
容易に取り外すことができる。しかも、窪み３ｂの深さ
ｈは、底３ａ内面から発電要素２までの距離Ｈよりも短
い。従って、発電要素２が窪み３ｂにより損傷すること
がない。
【００１４】
【発明の効果】本発明によると、電池を機器から取り外
すのが容易になり、しかも発電要素の損傷を防ぐことが
できる。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery. The present invention is particularly suitably applied to a lithium ion secondary battery built in a portable device. 2. Description of the Related Art Lithium ion secondary batteries having a high energy density are often used as batteries built in portable equipment such as mobile phones. Conventionally, a power generating element of a lithium ion secondary battery includes a positive electrode plate in which an active material such as lithium cobalt oxide is applied to a metal foil, and a host material capable of inserting and extracting lithium is applied to the metal foil. It has a negative electrode plate and a separator that is located between the two electrode plates and holds the electrolyte while separating them, and these are laminated and wound to form an oval shape. The power generating element is housed in a rectangular container opened on one side, and the opening of the container is closed by a lid. [0003] Regarding the orientation of the power generating element, for example, it is housed so that its winding axis is perpendicular to the bottom of the container. Also disclosed is a battery housed in such a manner that the winding axis is parallel to the bottom of the container, that is, the top of the curved surface of the power generating element is in contact with the bottom of the container (Japanese Patent Publication No. 2692533).
According to this battery, when the power generating element is inserted into the container,
Damage can be suppressed. [0004] However, it is not easy to remove the battery from the device when it is necessary to replace the battery with the conventional battery. To facilitate removal, it is conceivable to provide a recess on the outer surface of the container in which a nail can be hooked. However, to reduce the weight of batteries,
The thickness of the container is reduced. Therefore, if a dent is formed on the outer surface of the container, the dent cannot be prevented from protruding from the inner surface of the container in the container. for that reason,
The power generating element hits the depression, resulting in damage to the power generating element. Therefore, an object of the present invention is to provide a battery that can be easily removed from a device and that can prevent damage to a power generating element. [0005] A battery according to the present invention comprises a flat power generating element formed by laminating a positive electrode plate and a negative electrode plate with a separator interposed therebetween and winding them into an elliptical shape, and a rectangular opening having an opening on one side. In a battery comprising a container for accommodating a power generation element such that the top of a curved surface of the power generation element contacts the bottom, and a lid for closing the opening of the container, the battery is recessed in the bottom outer surface of the container to the inside of the bottom inner surface. When the depth of the depression is h, the thickness of the power generation element is 2t, and the distance from the center line in the thickness direction of the power generation element to the depression is d, h <t− (t 2 − d 2 ) 1/2
Is satisfied. In the present invention, since the dent is formed on the outer surface of the bottom of the container, the battery can be easily removed from the device by hooking a claw or the like in the dent. In addition, since the power generating element is wound in an elliptical shape, when the thickness of the power generating element is 2t, the curved surface of the power generating element has an arc shape with a radius t in a sectional view. Further, the power generating element is housed in the container such that the bottom of the container and the top of the curved surface of the power generating element are in contact with each other. Therefore, the distance from the bottom of the container to the curved surface of the power generation element at a position separated by the distance d from the center line in the thickness direction of the power generation element is represented by t− (t 2 −d 2 ) 1/2 . Here, in the present invention, the depth h of the depression is h <t−
(T 2 −d 2 ) 1/2 is satisfied, and is shorter than the distance to the curved surface of the power generating element. Therefore, according to this battery, it is possible to prevent the power generating element from hitting the depression and being damaged. [0007] In the present invention, there is no particular limitation on the method of forming the depression in the container. The depression may be formed simultaneously with the formation of the container, or the depression may be processed after the formation of the container. It is desirable that the inner size of the thickness of the container is substantially equal to the thickness 2t of the power generating element. In this case, the two main surfaces of the power generating element are in contact with the inner surface of the container, respectively, so that no useless space is created in the container. In this case, the center line in the thickness direction of the power generation element coincides with the center line in the thickness direction of the container. The battery of the present invention can be suitably applied as a lithium ion secondary battery. In the case of a lithium ion secondary battery, a metal foil coated with an active material such as lithium cobalt oxide is used for a positive electrode plate of a power generation element, and a metal foil coated with a host material such as a carbon material is used for a negative electrode plate. be able to. As the separator, a microporous film made of a resin such as polyethylene or polypropylene is preferably used. The separator preferably holds a non-aqueous electrolyte containing a halogen-based lithium salt, for example. The material of the container and the lid is preferably a metal such as aluminum. Further, it is preferable that one battery terminal penetrates the lid. Then, one of the positive and negative electrode plates is connected to the battery terminal, and the other is connected to the lid or the container. Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of the battery of the embodiment, FIG. 2 is a cross-sectional view cut in the thickness direction, and FIG. 3 is an enlarged bottom view of FIG. The battery 1 has a positive electrode plate in which an active material such as lithium cobalt oxide is coated on a metal foil, a separator for holding a non-aqueous electrolyte, and a host material capable of inserting and extracting lithium on the metal foil. The power generating element 2 includes a negative electrode plate coated. Each of the positive electrode plate, the separator, and the negative electrode plate has a band shape, and the power generating element 2 is formed by stacking these in order and winding them while folding in the vertical direction. Therefore, the power generation element 2 has an oval shape and is flat. The power generating element 2 is housed in a rectangular container 3 opened on one side. Container 3 is made of aluminum,
The inner dimension of the thickness is equal to the thickness of the power generation element 2. The power generating element 2 is housed in a direction in which its winding axis is parallel to the bottom 3 a of the container 3, and the top 2 b of the curved surface 2 a of the power generating element 2
Contacts the inner surface of the bottom 3 a of the container 3. An aluminum lid 4 is laser-welded to the opening of the container 3, thereby sealing the container 3. A through hole is formed in the center of the lid 4, and the negative electrode terminal 5 is inserted into the through hole together with the insulating packing 6. The negative electrode plate of the power generation element 2 is connected to the lower end of the negative electrode terminal 5, and the positive electrode plate is connected to the lower surface of the lid 4. At the corner of the outer surface of the bottom 3a of the container, a square recess 3b is formed at two places. Each recess 3b has a bottom 3
Although it is recessed deeper than the inner surface of a, the depth h is shorter than the distance H from the inner surface of the bottom 3a at the same position to the curved surface of the power generating element 2a. Here, the top 2b of the curved surface 2a of the power generating element 2 contacts the inner surface of the bottom 3a of the container 3, and the curved surface 2a
a has an arc shape. Therefore, the thickness of the power generation element 2 is 2t,
When the distance from the center line C in the thickness direction of the power generating element 2 to the depression 3b is d, the distance H is t− (t 2 −d 2 ) 1/2.
It becomes. Therefore, in the present embodiment, h <t− (t 2 −d 2 )
1/2 relationship is satisfied. As shown in FIG. 4 as a perspective view, the battery 1 of the present embodiment is mounted on a device 7 such as a mobile phone. The battery 1 is removed when necessary such as when replacing the battery. The battery 1 is provided with a depression 3 b in the bottom 3 a of the container 3. Therefore, the battery 1 can be easily removed by hooking the nail in the recess 3b. Moreover, the depth h of the depression 3b is shorter than the distance H from the inner surface of the bottom 3a to the power generation element 2. Therefore, the power generating element 2 is not damaged by the depression 3b. According to the present invention, the battery can be easily removed from the device, and the power generating element can be prevented from being damaged.
【図面の簡単な説明】
【図１】実施形態の電池を示す斜視図である。
【図２】実施形態の電池を示す厚さ方向断面図である。
【図３】図２の底部拡大図である。
【図４】実施形態の電池の使用状態を示す斜視図であ
る。
【符号の説明】
１電池
２発電要素
２ａ湾曲面、２ｂ頂部
３容器
３ａ底、３ｂ窪み
４蓋
５負極端子
６パッキン
７機器BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a battery according to an embodiment. FIG. 2 is a sectional view in the thickness direction showing the battery of the embodiment. FIG. 3 is a bottom enlarged view of FIG. 2; FIG. 4 is a perspective view showing a use state of the battery of the embodiment. [Description of Signs] 1 battery 2 power generation element 2a curved surface 2b top 3 container 3a bottom 3b recess 4 lid 5 negative electrode terminal 6 packing 7 equipment
Claims (1)
層し、長円状に巻回してなる扁平な発電要素と、一方に
開口した角形をなし、底に発電要素の湾曲面の頂部が接
触するように発電要素を収納する容器と、容器の開口を
封じる蓋とを備える電池において、 容器の底外面に底内面よりも内側にまで凹んだ窪みが形
成されており、窪みの深さをｈ、発電要素の厚さを２
ｔ、発電要素の厚さ方向中心線から窪みまでの距離をｄ
とするとき、ｈ＜ｔ−（ｔ2−ｄ2）1/2の関係を満たす
ことを特徴とする電池。Claims: 1. A flat power generating element formed by laminating a positive electrode plate and a negative electrode plate via a separator and wound in an elliptical shape, and a rectangular power generation element with one opening, and a power generation element at the bottom. In a battery comprising a container for accommodating a power generation element such that the top of the curved surface of the container comes into contact with the lid and a lid for closing the opening of the container, a recess is formed on the outer surface of the bottom of the container so as to be recessed inward from the inner surface of the bottom. , The depth of the depression is h, and the thickness of the power generation element is 2
t, the distance from the center line in the thickness direction of the power generating element to the depression is d
Where h <t− (t 2 −d 2 ) 1/2 .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001368897A JP2003168400A (en) | 2001-12-03 | 2001-12-03 | Battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001368897A JP2003168400A (en) | 2001-12-03 | 2001-12-03 | Battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2003168400A true JP2003168400A (en) | 2003-06-13 |
Family
ID=19178398
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001368897A Pending JP2003168400A (en) | 2001-12-03 | 2001-12-03 | Battery |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2003168400A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100788560B1 (en) | 2006-03-27 | 2007-12-26 | 삼성에스디아이 주식회사 | Can for lithium rechargeable battery and Lithium rechargeable battery using the same and Method of making the same |
| US20140272476A1 (en) * | 2012-02-07 | 2014-09-18 | Lg Chem, Ltd. | Prismatic battery pack with novel structure |
-
2001
- 2001-12-03 JP JP2001368897A patent/JP2003168400A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100788560B1 (en) | 2006-03-27 | 2007-12-26 | 삼성에스디아이 주식회사 | Can for lithium rechargeable battery and Lithium rechargeable battery using the same and Method of making the same |
| US20140272476A1 (en) * | 2012-02-07 | 2014-09-18 | Lg Chem, Ltd. | Prismatic battery pack with novel structure |
| US9484561B2 (en) * | 2012-02-07 | 2016-11-01 | Lg Chem, Ltd. | Prismatic battery pack with novel structure |
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