JP2001325937A - Battery with lead - Google Patents
Battery with leadInfo
- Publication number
- JP2001325937A JP2001325937A JP2000143359A JP2000143359A JP2001325937A JP 2001325937 A JP2001325937 A JP 2001325937A JP 2000143359 A JP2000143359 A JP 2000143359A JP 2000143359 A JP2000143359 A JP 2000143359A JP 2001325937 A JP2001325937 A JP 2001325937A
- Authority
- JP
- Japan
- Prior art keywords
- lead
- battery
- nickel
- container
- storage element
- 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
Landscapes
- Connection Of Batteries Or Terminals (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、リードを有する
電池に属し、特にそのリード部分の外部機器との接合性
及び機械的強度に優れた電池に属する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery having a lead, and more particularly to a battery having excellent leadability and mechanical strength in connection with external devices.
【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
リードとを備えた薄型電池が使用されている。この薄型
電池は、全体に剛性をもたせるために更に樹脂でモール
ドされる。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 thin battery having a lead connected to an electric storage element and exposed outside a battery container is used. This thin battery is further molded with a resin in order to have rigidity as a whole.
【０００３】この薄型電池において蓄電要素は、薄い集
電体の表面に活物質が塗布されてセパレータを介して渦
状に巻かれるか、セパレータを介して多層に積層されて
いる。リードは、集電体に溶着又は針カシメなどの手段
により接合されている。リードはフィルムの内面間を通
って電池容器外に露出するので、リードが露出する所で
はフィルム縁部同士を溶着することができない。ただ
し、リードのフィルム縁部と交差する箇所は樹脂によっ
て被覆されているため、この樹脂とフィルム縁部とが溶
着し、ここでも気密性が維持される。[0003] In this thin battery, the power storage element is formed by applying an active material to the surface of a thin current collector and winding it spirally through a separator, or by laminating multiple layers through the separator. The lead is joined to the current collector by welding or crimping. Since the leads pass through between the inner surfaces of the film and are exposed to the outside of the battery container, the film edges cannot be welded to each other where the leads are exposed. However, since the portion of the lead that intersects with the film edge is covered with the resin, the resin and the film edge are welded, and the airtightness is maintained here.
【０００４】この種の電池は、例えば以下のようにして
製造される。はじめに、リードの所定箇所に樹脂を被覆
し、続いてリードを蓄電要素の電極に接続する。次に、
これを電池容器の材料となるフィルムによって、リード
の一部が露出するように包む。このとき、フィルムの縁
部と前記被覆樹脂とが交差するように蓄電要素及びリー
ドの位置を定める必要がある。最後に、フィルムの縁部
同士及びフィルムの縁部と前記被覆樹脂とを溶着する。
ただし、リードの反対側のフィルム縁部は開いたままに
しておき、そこから電解液を注入した後に溶着する。A battery of this type is manufactured, for example, as follows. First, a predetermined portion of the lead is coated with a resin, and then the lead is connected to the electrode of the storage element. next,
This is wrapped with a film as a material of the battery container so that a part of the lead is exposed. At this time, it is necessary to determine the positions of the power storage elements and the leads so that the edge of the film and the coating resin intersect. Finally, the edges of the film and the edge of the film and the coating resin are welded.
However, the film edge on the opposite side of the lead is left open, and the electrolyte is injected from there and then welded.
【０００５】従来、リードの材質としては正極側にアル
ミニウム、負極側に銅又はニッケルメッキされた銅が用
いられていた。これは、導電性に優れて電池の内部抵抗
を小さくできること、正極には高いプラス電位がかかる
ので耐腐食性が要求されること、低コストであること等
による。ニッケルメッキするのは、主に耐食性を向上さ
せるためである。Conventionally, the lead material has been aluminum on the positive electrode side and copper or copper plated with nickel on the negative electrode side. This is because the battery has excellent conductivity and can reduce the internal resistance of the battery, requires a high positive potential to be applied to the positive electrode, requires corrosion resistance, and has a low cost. Nickel plating is mainly for improving corrosion resistance.
【０００６】電池と外部機器との電気的接続は、リード
の外側端部を外部機器の端子にスポット溶接、半田付
け、超音波溶着などすることによってなされうる。この
うち、電池にダメージを与えずしかも量産性に優れてい
るのはスポット溶接である。The electrical connection between the battery and the external device can be made by spot welding, soldering, ultrasonic welding, or the like, on the outer end of the lead to the terminal of the external device. Among them, spot welding does not damage the battery and is excellent in mass productivity.
【０００７】[0007]
【発明が解決しようとする課題】しかし、銅やアルミニ
ウムは、その電気抵抗値が小さいためにスポット溶接時
の発熱量が少なく、金属が十分に溶融しない。従って、
接続の信頼性に劣る。また、リードは前記のように気密
性保持のために電池容器の端部に溶着されていることか
ら、衝撃による電池容器の面方向変位に伴ってリードの
長さ方向に応力がかかる。従って、リードの機械的強度
が弱いと断線を生じる。それ故、この発明の課題は、外
部機器との接続（溶接、溶着）性、特にスポット溶接性
及び強度的信頼性に優れたリードを有する電池を提供す
ることにある。However, since copper and aluminum have low electric resistance, the calorific value during spot welding is small, and the metal does not melt sufficiently. Therefore,
Poor connection reliability. Further, since the lead is welded to the end of the battery container to maintain the airtightness as described above, stress is applied in the length direction of the lead along with the surface direction displacement of the battery container due to the impact. Therefore, if the mechanical strength of the lead is weak, disconnection occurs. Therefore, an object of the present invention is to provide a battery having a lead excellent in connection (welding, welding) to external equipment, particularly spot weldability and strength reliability.
【０００８】[0008]
【課題を解決するための手段】その課題を解決するため
に、この発明の電池は、蓄電要素と、蓄電要素を収納す
る容器と、蓄電要素の各電極に個別に接合されて容器外
に導出されるリードとを備える電池において、前記リー
ドのうち容器外側の端部から始まり所定長さＬまでの部
分が、ニッケル、ニッケル合金、鉄及びステンレスのう
ち１種以上からなることを特徴とする。ここでニッケル
合金とはニッケルを９０重量％以上含む合金をいう。ス
テンレスとしてはＳＵＳ３１６、３１７が例示される。In order to solve the problem, a battery according to the present invention comprises a power storage element, a container for storing the power storage element, and a battery which is individually joined to each electrode of the power storage element and led out of the container. And a portion of the lead starting from an end outside the container and extending to a predetermined length L is made of at least one of nickel, a nickel alloy, iron, and stainless steel. Here, the nickel alloy refers to an alloy containing 90% by weight or more of nickel. Examples of stainless steel include SUS316 and 317.
【０００９】このようにリードのうち容器外側に露出し
ている端部を含む少なくとも一部が、ニッケル、ニッケ
ル合金、鉄及びステンレスの１種以上からなるので、そ
の部分は電気抵抗が高くなり、スポット溶接時に十分溶
融し外部端子と確実に接続できる。前記所定長さＬを定
める終端が、容器のリード導出側縁部と交差する位置に
あると、リードのうち応力のかかりやすい部分全体がニ
ッケル、ニッケル合金、鉄又はステンレスからなるの
で、その部分の機械的強度を高めることができる上に、
耐食性に劣るそれら金属が電解液に触れない点で好まし
い。従って、この構成は正極に適用すると良い。As described above, at least a part of the lead including the end exposed to the outside of the container is made of at least one of nickel, nickel alloy, iron and stainless steel. Melts sufficiently during spot welding and can be reliably connected to external terminals. If the end defining the predetermined length L is located at a position intersecting with the lead lead-out side edge of the container, the entire part of the lead that is easily stressed is made of nickel, nickel alloy, iron or stainless steel. In addition to being able to increase mechanical strength,
These metals having poor corrosion resistance are preferred in that they do not come into contact with the electrolytic solution. Therefore, this configuration is preferably applied to the positive electrode.
【００１０】更に前記所定長さＬを定める終端が、蓄電
要素との接合部にあると、電池容器に対する蓄電要素の
変位に伴って応力を受ける部分もニッケル、ニッケル合
金、鉄又はステンレスからなるので、リードが断線しに
くくなり、好ましい。前記リードの残部は、蓄電要素の
集電体と同質の金属からなると好ましい。集電体との導
通が良好だからである。Further, if the end defining the predetermined length L is at the junction with the power storage element, the portion which receives stress due to the displacement of the power storage element with respect to the battery container is also made of nickel, nickel alloy, iron or stainless steel. This is preferable because the lead hardly breaks. It is preferable that the rest of the lead is made of a metal of the same quality as the current collector of the power storage element. This is because conduction with the current collector is good.
【００１１】このようにリードの材質を長さ方向で異な
らせる方法としては、クラッド材を用いることが挙げら
れる。そして、クラッド材にしても他の方式にしても、
異種金属同士の接合面の方向は限定されない。従って、
以下の実施形態で詳述するが、図２に示すようにリード
の主面の一部同士で接合しても良いし、図３に示すよう
にリードの端面同士で突き合わせて接合しても良い。更
にまた、図示しないがリードの長さ方向に対して傾斜す
る方向、例えば４５°方向に接合面を有していても良
い。このように傾斜方向に接合面を形成するとリードの
厚みを増すことなく接合面積が広くなって好ましく、そ
の方法としては、接合後に圧延することが挙げられる。As a method of making the material of the lead different in the length direction, use of a clad material can be mentioned. And even if it is a clad material or another method,
The direction of the joining surface between dissimilar metals is not limited. Therefore,
As will be described in detail in the following embodiments, as shown in FIG. 2, a part of the main surface of the lead may be joined, or as shown in FIG. . Further, although not shown, the bonding surface may be provided in a direction inclined with respect to the length direction of the lead, for example, a 45 ° direction. It is preferable to form the bonding surface in the inclined direction in this manner, since the bonding area is increased without increasing the thickness of the lead. As a method for this, rolling after bonding is preferable.
【００１２】[0012]
【発明の実施の形態】この発明の実施形態を図面と共に
説明する。図１は実施形態の電池を示す要部破断正面
図、図２及び図３は各々その電池に用いられている正極
リード及び負極リードを示す長寸方向断面図である。電
池１は、アルミニウム箔からなる正極集電体に正極活物
質を塗布してなる正極２と、銅箔からなる負極集電体に
負極活物質を塗布してなる負極３と、正負極間に介在す
るポリエチレン又はポリプロピレンなどの有機高分子微
多孔膜からなるセパレータ４とを蓄電要素としている。Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a fragmentary front view showing a battery according to an embodiment, and FIGS. 2 and 3 are longitudinal sectional views showing a positive electrode lead and a negative electrode lead used in the battery, respectively. The battery 1 has a positive electrode 2 formed by applying a positive electrode active material to a positive electrode current collector formed of aluminum foil, a negative electrode 3 formed by applying a negative electrode active material to a negative electrode current collector formed of copper foil, and a positive electrode and a negative electrode. An intervening separator 4 made of a microporous organic polymer film such as polyethylene or polypropylene is used as a power storage element.
【００１３】蓄電要素は、正極２及び負極３の各端部に
正極リード５及び負極リード６がそれぞれ針カシメ又は
溶接により固着され、正極２を内側にして渦状に巻かれ
た状態でアルミニウム樹脂ラミネートフィルムにて包ま
れ、ラミネートフィルムの三方の縁部を熱溶着すること
により密封される。熱溶着後のラミネートフィルムは、
電池容器７となる。尚、熱溶着の順序は、リード５、６
の取り出し側の溶着代７ａと反対側の溶着代７ｂが最後
になるようにする。溶着代７ａと主面中央の溶着代７ｃ
を溶着した後、電解液をリード５、６取り出し側を下向
きにして上方から電解液を注入するからである。The power storage element has a positive electrode lead 5 and a negative electrode lead 6 fixed to each end of the positive electrode 2 and the negative electrode 3 by needle caulking or welding, respectively. It is wrapped in a film and sealed by heat welding the three edges of the laminated film. The laminated film after heat welding is
It becomes the battery container 7. The order of the heat welding is as follows.
The welding margin 7a on the take-out side and the welding margin 7b on the opposite side are made last. Welding allowance 7a and welding allowance 7c at the center of the main surface
After welding, the electrolyte is injected from above with the lead-out sides of the leads 5 and 6 taken downward.
【００１４】正極リード５は、ニッケルとアルミニウム
とのクラッド材からなり、アルミニウム側５ａが正極２
に固着され、ニッケル側５ｂが容器７の外に露出してい
る。但し、このニッケルの一部も正極２と固着されてい
る。従って、ニッケルとアルミニウムとの界面５ｃは正
極２と重なっている。負極リード６は、ニッケルと銅と
のクラッド材からなり、銅側６ａが負極３に固着され、
ニッケル側６ｂが正極リード５と同じく一部負極３と固
着されている他は容器７の外に露出している。従って、
ニッケルと銅との界面６ｃは負極３と重なっている。ニ
ッケルとアルミニウムとのクラッド材としては、福田金
属箔粉工業株式会社製複合材が挙げられ、ニッケルと銅
とのクラッド材としては、日本メクトロン株式会社製複
合材が挙げられる。The positive electrode lead 5 is made of a clad material of nickel and aluminum, and the aluminum side 5a is
And the nickel side 5b is exposed outside the container 7. However, a part of the nickel is also fixed to the positive electrode 2. Therefore, the interface 5 c between nickel and aluminum overlaps with the positive electrode 2. The negative electrode lead 6 is made of a clad material of nickel and copper, and the copper side 6a is fixed to the negative electrode 3,
Except that the nickel side 6b is partially fixed to the negative electrode 3 like the positive electrode lead 5, the nickel side 6b is exposed outside the container 7. Therefore,
The interface 6 c between nickel and copper overlaps the negative electrode 3. As a clad material of nickel and aluminum, a composite material manufactured by Fukuda Metal Foil & Powder Co., Ltd. is exemplified, and as a clad material of nickel and copper, a composite material manufactured by Nippon Mektron Co., Ltd. is exemplified.
【００１５】このようにリード５、６が、電極２、３と
の接合部分から電池容器７の外に露出するに至るまでニ
ッケルからなるので、リード５、６を外部機器の端子に
溶接した後に電池全体が外部機器に対して変位したり、
蓄電要素が電池容器７に対して面方向に変位したりして
も断線することがない。また、露出部分がニッケルから
なるので電池容器７内の部分よりも電気抵抗が高くな
り、スポット溶接時に溶接部が十分に発熱し外部端子と
確実に接合できる。As described above, since the leads 5 and 6 are made of nickel from the joint with the electrodes 2 and 3 to the outside of the battery case 7, the leads 5 and 6 are welded to the terminals of the external equipment. The whole battery may be displaced with respect to external equipment,
Even if the electricity storage element is displaced in the plane direction with respect to the battery container 7, there is no disconnection. Further, since the exposed portion is made of nickel, the electric resistance is higher than that of the portion inside the battery container 7, and the welded portion generates sufficient heat at the time of spot welding, so that the external terminal can be reliably joined.
【００１６】尚、界面５ｃ、６ｃは、電池容器７のリー
ド取り出し側の溶着代７ａと重なる仮想線位置５ｄ、６
ｄに設定しても良い。それでも外部端子との溶接性に優
れる点は変わりないからである。又、正極リード５の界
面５ｃが上記のように実線位置にあるときは、耐食性に
劣るニッケルが電解液に触れるのを防止するために界面
５ｃから仮想線位置５ｄに至る部分を耐電解液性の樹脂
で覆うと良い。更に、電池から上記のようなリードを導
出する技術は、金属樹脂ラミネートフィルムの凹状成形
部に蓄電要素を収納し、この上に別のラミネートフィル
ムを被せると共に、これらのラミネートフィルムの重な
り合った周縁部を熱溶着等により封口する、所謂バター
カップ方式の電池にも適用可能である。The interfaces 5c and 6c are imaginary line positions 5d and 6 which overlap the welding margin 7a on the lead extraction side of the battery container 7.
d may be set. Even so, the point of excellent weldability with the external terminal remains unchanged. When the interface 5c of the positive electrode lead 5 is located at the solid line position as described above, the portion from the interface 5c to the imaginary line position 5d is prevented from contacting the electrolytic solution with nickel having poor corrosion resistance. It is good to cover with resin. Furthermore, the technique of deriving the above-described lead from the battery is to store the electricity storage element in the concave molded portion of the metal resin laminated film, cover another laminated film thereon, and overlap the peripheral portions of these laminated films. Can also be applied to a so-called buttercup type battery in which is sealed by heat welding or the like.
【００１７】[0017]
【発明の効果】リードの外部機器との接続性、特にスポ
ット溶接性、及び耐衝撃性に優れる。According to the present invention, the lead is excellent in connectivity with external devices, particularly in spot weldability and impact resistance.
【図１】 実施形態の電池を示す一部破断正面図であ
る。FIG. 1 is a partially cutaway front view showing a battery according to an embodiment.
【図２】 上記電池に用いられている正極リードを示す
長寸方向断面図である。FIG. 2 is a longitudinal sectional view showing a positive electrode lead used in the battery.
【図３】 上記電池に用いられている負極リードを示す
長寸方向断面図である。FIG. 3 is a longitudinal sectional view showing a negative electrode lead used in the battery.
１ 電池 ２ 正極 ３ 負極 ４ セパレータ ５ 正極リード ５ａ アルミニウム側、５ｂ ニッケル側、５ｃ 界面 ６ 負極リード ６ａ 銅側、６ｂ ニッケル側、６ｃ 界面 ７ 電池容器 ７ａ、７ｂ、７ｃ 溶着代 DESCRIPTION OF SYMBOLS 1 Battery 2 Positive electrode 3 Negative electrode 4 Separator 5 Positive electrode lead 5a Aluminum side, 5b Nickel side, 5c Interface 6 Negative electrode lead 6a Copper side, 6b Nickel side, 6c Interface 7 Battery container 7a, 7b, 7c Welding margin
───────────────────────────────────────────────────── フロントページの続き (72)発明者 小沢 英司 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） 5H022 AA18 CC05 CC12 CC15 CC19 CC23 EE03 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Eiji Ozawa, Inventor F-term (reference) 5H022 AA18 CC05 CC12 CC15 CC19 CC23 EE03 in GS Melcotec Co., Ltd.
Claims (5)
蓄電要素の各電極に個別に接合されて容器外に導出され
るリードとを備える電池において、 前記リードのうち容器外側の端部から始まり所定長さＬ
までの部分が、ニッケル、ニッケル合金、鉄及びステン
レスのうち１種以上からなることを特徴とする電池。1. A power storage element, a container for storing the power storage element,
A lead individually joined to each electrode of the electricity storage element and led out of the container, wherein the lead has a predetermined length L starting from an end outside the container.
A battery comprising: at least one of nickel, a nickel alloy, iron, and stainless steel.
ード導出側縁部と交差する位置にある請求項１に記載の
電池。2. The battery according to claim 1, wherein the end defining the predetermined length L is located at a position intersecting with a lead-out side edge of the container.
との接合部にある請求項１に記載の電池。3. The battery according to claim 1, wherein an end terminating the predetermined length L is at a junction with an electric storage element.
ードのうち、所定長さＬを定める終端から容器のリード
導出側縁部と交差位置までの範囲が樹脂で被覆されてい
る請求項３に記載の電池。4. The lead is a positive electrode lead, and a portion of the lead from a terminal end defining a predetermined length L to a crossing position with a lead lead-out side edge of the container is covered with a resin. The battery according to 1.
同質の金属からなる請求項１〜４のいずれかに記載の電
池。5. The battery according to claim 1, wherein the remaining portion of the lead is made of a metal of the same quality as the current collector of the power storage element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000143359A JP2001325937A (en) | 2000-05-16 | 2000-05-16 | Battery with lead |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000143359A JP2001325937A (en) | 2000-05-16 | 2000-05-16 | Battery with lead |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2001325937A true JP2001325937A (en) | 2001-11-22 |
Family
ID=18650194
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000143359A Pending JP2001325937A (en) | 2000-05-16 | 2000-05-16 | Battery with lead |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2001325937A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100871917B1 (en) | 2007-06-26 | 2008-12-05 | 주식회사엘콤 | A positive tab with a good solder ability and a good corrosion-resistance to salt water for a secondary battery and the fabrication method thereof, and a secondary battery and a secondary battery module using the same |
| JP2012049020A (en) * | 2010-08-27 | 2012-03-08 | Sumitomo Electric Ind Ltd | Lead member and manufacturing method of lead member |
| JP2012212602A (en) * | 2011-03-31 | 2012-11-01 | Nec Energy Devices Ltd | Battery pack |
| WO2020218214A1 (en) * | 2019-04-25 | 2020-10-29 | 株式会社村田製作所 | Secondary battery |
-
2000
- 2000-05-16 JP JP2000143359A patent/JP2001325937A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100871917B1 (en) | 2007-06-26 | 2008-12-05 | 주식회사엘콤 | A positive tab with a good solder ability and a good corrosion-resistance to salt water for a secondary battery and the fabrication method thereof, and a secondary battery and a secondary battery module using the same |
| JP2012049020A (en) * | 2010-08-27 | 2012-03-08 | Sumitomo Electric Ind Ltd | Lead member and manufacturing method of lead member |
| JP2012212602A (en) * | 2011-03-31 | 2012-11-01 | Nec Energy Devices Ltd | Battery pack |
| WO2020218214A1 (en) * | 2019-04-25 | 2020-10-29 | 株式会社村田製作所 | Secondary battery |
| JPWO2020218214A1 (en) * | 2019-04-25 | 2020-10-29 | ||
| JP7124960B2 (en) | 2019-04-25 | 2022-08-24 | 株式会社村田製作所 | secondary battery |
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