JP2002134095A - Lithium secondary battery - Google Patents
Lithium secondary batteryInfo
- Publication number
- JP2002134095A JP2002134095A JP2000323456A JP2000323456A JP2002134095A JP 2002134095 A JP2002134095 A JP 2002134095A JP 2000323456 A JP2000323456 A JP 2000323456A JP 2000323456 A JP2000323456 A JP 2000323456A JP 2002134095 A JP2002134095 A JP 2002134095A
- Authority
- JP
- Japan
- Prior art keywords
- negative electrode
- battery
- lithium secondary
- current collector
- electrode current
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明はリチウム二次電池に
係り、特に、正負極がセパレータを介して合成樹脂製で
中空円筒状の捲芯に捲回された電極捲回群を電池容器内
に収容したリチウム二次電池に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lithium secondary battery, and more particularly, to a battery container in which a positive electrode and a negative electrode are wound around a hollow cylindrical core made of synthetic resin via a separator. The present invention relates to a stored lithium secondary battery.
【０００２】[0002]
【従来の技術】従来、小型リチウム二次電池の負極集電
構造では、例えば、図３に示すように、負極電極板１５
の基材箔（銅箔）の部分に、ニッケル製で短冊状の負極
リード板１１’が超音波溶接等で接合されており、この
負極リード板１１’の電池容器４の底面側下端部が正極
電極板１４及び負極電極板１５をセパレータ１３を介し
て捲回した電極捲回群１８の中心部方向へ直角に折り曲
げられ電池容器４の底面に抵抗溶接等で接合されてい
た。2. Description of the Related Art Conventionally, in a negative electrode current collecting structure of a small lithium secondary battery, for example, as shown in FIG.
And a strip-shaped negative electrode lead plate 11 'made of nickel is joined to the portion of the base foil (copper foil) by ultrasonic welding or the like. The positive electrode plate 14 and the negative electrode plate 15 were bent at right angles in the direction of the center of the electrode winding group 18 in which the positive electrode plate 14 and the negative electrode plate 15 were wound via the separator 13 and joined to the bottom surface of the battery container 4 by resistance welding or the like.
【０００３】しかしながら、近年、電気自動車（ＥＶ）
やハイブリッド自動車（ＨＥＶ）等の大容量二次電池の
用途に対応すべく、大型リチウム二次電池の開発が進め
られている。大型リチウム二次電池では、小型リチウム
二次電池の負極集電構造用の負極リード板１１’を採用
しても、負極リード板１１’に流れる許容電流量が制限
されているので、大電流の充放電に耐えることはできな
い。However, recently, electric vehicles (EV)
Large-sized lithium secondary batteries are being developed in order to cope with the use of large-capacity secondary batteries such as electric vehicles and hybrid vehicles (HEV). In the case of a large-sized lithium secondary battery, even if the negative electrode lead plate 11 'for the negative electrode current collecting structure of the small lithium secondary battery is employed, the allowable current amount flowing through the negative electrode lead plate 11' is limited. It cannot withstand charging and discharging.
【０００４】この問題を解決するために、大型リチウム
二次電池では、例えば、図４に示すように、中央部が捲
芯５の下端部に固定されフランジの周縁が電池容器４の
底面側に折り曲げられたリング状で大電流放電に耐え得
る銅又は銅合金製の負極集電体１０の周縁部に、負極電
極板の基材箔（銅箔）から導出されたリード片（銅箔）
８が束ねられて超音波溶接等で溶接されている。また、
負極集電体１０はニッケル製で断面逆ハット状の負極リ
ード板１１のフランジ部に接合されており、負極リード
板１１の逆ハット先端部中央に形成されたプロジェクシ
ョンを電池容器４の底面に抵抗溶接することにより、負
極リード板１１を電池容器４に固定すると共に、負極電
極板と電池容器４との導通を確保していた。従って、従
来の大型リチウム二次電池では、捲芯５の下端と断面逆
ハット状の負極リード板１１のハット部との間に空間１
２が形成されていた。In order to solve this problem, in a large-sized lithium secondary battery, for example, as shown in FIG. 4, a central portion is fixed to a lower end portion of a core 5 and a peripheral edge of a flange is provided on a bottom side of a battery container 4. A lead piece (copper foil) derived from a base foil (copper foil) of a negative electrode plate is provided on a peripheral portion of a negative electrode current collector 10 made of copper or a copper alloy that can withstand a large current discharge in a bent ring shape.
8 are bundled and welded by ultrasonic welding or the like. Also,
The negative electrode current collector 10 is made of nickel and is joined to a flange portion of a negative electrode lead plate 11 having an inverted hat shape in cross section. The projection formed at the center of the inverted hat tip of the negative electrode lead plate 11 is connected to the bottom surface of the battery container 4 by resistance. By welding, the negative electrode lead plate 11 was fixed to the battery container 4, and conduction between the negative electrode plate and the battery container 4 was ensured. Therefore, in the conventional large-sized lithium secondary battery, the space 1 is located between the lower end of the winding core 5 and the hat portion of the negative electrode lead plate 11 having an inverted hat-shaped cross section.
2 had been formed.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、上述し
た従来の大型リチウム二次電池の負極集電構造では、負
極集電体１０と負極リード板１１とを別々の板材からプ
レス加工により作製し、かつ、両者を予め超音波溶接や
抵抗溶接等によって接合する工程が必要なため、リチウ
ム二次電池のコスト高を招く、という問題点があった。However, in the above-mentioned conventional negative electrode current collecting structure of a large-sized lithium secondary battery, the negative electrode current collector 10 and the negative electrode lead plate 11 are formed from separate plates by press working, and However, since a step of joining the two by ultrasonic welding, resistance welding, or the like is required in advance, there has been a problem that the cost of the lithium secondary battery is increased.
【０００６】また、この構造では、過充電等によって電
池容器４内のガスが高圧となったときに、ガスを捲芯５
の中空部を介して正極側の電池蓋１６に収容された安全
弁１７から電池外に排出するために、捲芯５の下端と負
極リード板１１との間に空間１２を形成することが必須
であり、電池の小型化の上からも望ましくはなかった。Further, in this structure, when the gas in the battery container 4 becomes high pressure due to overcharging or the like, the gas is transferred to the winding core 5.
It is essential to form a space 12 between the lower end of the winding core 5 and the negative electrode lead plate 11 in order to discharge the battery from the safety valve 17 accommodated in the battery cover 16 on the positive electrode side through the hollow portion. This is not desirable from the viewpoint of miniaturization of the battery.
【０００７】本発明は上記事案に鑑み、安全性を有しつ
つ高容量化及び低コストのリチウム二次電池を提供する
ことを課題とする。The present invention has been made in view of the above circumstances, and has as its object to provide a high-capacity, low-cost lithium secondary battery having safety.
【０００８】[0008]
【課題を解決するための手段】上記課題を解決するため
に、本発明は、正負極がセパレータを介して合成樹脂製
で中空円筒状の捲芯に捲回された電極捲回群を電池容器
内に収容したリチウム二次電池において、前記負極から
導出されたリード片が周縁部に接合され、該接合面の背
面が前記電池容器の底面に接合された平板状の負極集電
板を備え、該負極集電板には前記捲芯の外径の周りに前
記電極捲回群の下端及び前記電池容器の底面間で画定さ
れる空間と前記軸芯の中空部とを連通する連通穴が形成
されたことを特徴とする。In order to solve the above-mentioned problems, the present invention relates to a battery container comprising a group of electrode windings in which a positive electrode and a negative electrode are wound around a hollow cylindrical core made of synthetic resin via a separator. In the lithium secondary battery housed therein, a lead piece derived from the negative electrode is joined to a peripheral portion, and a back surface of the joining surface includes a flat negative electrode current collector plate joined to the bottom surface of the battery container, In the negative electrode current collector plate, a communication hole is formed around the outer diameter of the winding core to communicate a space defined between the lower end of the electrode winding group and the bottom surface of the battery container and the hollow portion of the shaft core. It is characterized by having been done.
【０００９】本発明によれば、平板状の負極集電板の周
縁部に負極から導出されたリード片が接合されおり、該
接合面の背面が電池容器の底面に接合されているので、
大電流放電時にも使用に耐えることができると共に、負
極から導出されたリード片が負極集電板の平板状の接合
面に接合されており、周縁が電池容器の底面側にリング
状に折り曲げられていないので、負極集電板の高さ（厚
さ）方向のサイズを小さくすることができる。また、負
極集電板に、捲芯の外径の周りに電極捲回群の下端及び
電池容器の底面間で画定される空間と軸芯の中空部とを
連通する連通穴が形成されているので、上述した空間１
２を形成したり、負極リード板１１を設ける必要がな
い。従って、負極集電板を高さ方向にサイズの小さい単
一部品で構成することができるので、リチウム二次電池
の高容量化（小型化）を図ることができると共に、部品
点数を削減することができる。According to the present invention, the lead piece led out from the negative electrode is joined to the periphery of the flat negative electrode current collector plate, and the back surface of the joining surface is joined to the bottom surface of the battery container.
In addition to being able to withstand use even during large current discharge, the lead piece derived from the negative electrode is joined to the flat joining surface of the negative electrode current collector plate, and the periphery is bent into a ring shape on the bottom side of the battery container Therefore, the size of the negative electrode current collector plate in the height (thickness) direction can be reduced. In addition, a communication hole is formed in the negative electrode current collector plate around the outer diameter of the winding core to communicate a space defined between the lower end of the electrode winding group and the bottom surface of the battery container and the hollow portion of the shaft core. So, the space 1 mentioned above
2 and the negative electrode lead plate 11 need not be provided. Therefore, since the negative electrode current collector plate can be composed of a single component having a small size in the height direction, the capacity (reduction in size) of the lithium secondary battery can be increased, and the number of components can be reduced. Can be.
【００１０】この場合において、負極集電板に、プレス
による切り曲げ加工で舌状突起が立設されるようにすれ
ば、舌状突起が捲芯の中空部に挿入されて大電流放電時
の放熱効果を高めることができると共に、捲芯の外径の
周りに電極捲回群の下端及び電池容器の底面間で画定さ
れる空間内のガスが高圧となったときに、切り曲げ加工
で同時に形成された連通穴からこの高圧ガスを捲芯の中
空部へ誘導することができる。また、負極集電板の背面
に凸設されたプロジェクションを有するようにしたの
で、電池容器の底面との溶接を容易に行うことができ
る。更に、負極集電板を、銅又は銅合金と、ニッケル又
はニッケル合金と、のクラッド材とし、該銅又は銅合金
側の面を負極から導出されたリード片に溶接し、ニッケ
ル又はニッケル合金側の面を電池容器の底面に抵抗溶接
するようにすれば、リード片との溶接信頼性を確保しつ
つ、電池容器の底面との抵抗溶接時の発熱量が増加して
溶接部に形成されるナゲット径を大きくすることができ
るので、大電流放電時に溶接部での発熱量を小さくする
ことができる。[0010] In this case, if the tongue-like projections are formed on the negative electrode current collector plate by cutting and bending with a press, the tongue-like projections are inserted into the hollow portion of the winding core, and a large current is discharged. The heat radiation effect can be enhanced, and when the gas in the space defined between the lower end of the electrode winding group and the bottom surface of the battery container becomes high pressure around the outer diameter of the winding core, it is simultaneously cut and bent. This high-pressure gas can be guided to the hollow portion of the winding core from the formed communication hole. In addition, since the projection is provided on the back surface of the negative electrode current collector plate, welding to the bottom surface of the battery container can be easily performed. Further, the negative electrode current collector plate is made of a clad material of copper or a copper alloy and nickel or a nickel alloy, and the surface on the copper or copper alloy side is welded to a lead piece led out from the negative electrode to form a nickel or nickel alloy side. If the surface of the battery container is resistance-welded to the bottom surface of the battery container, the amount of heat generated at the time of resistance welding with the bottom surface of the battery container increases while securing the welding reliability with the lead piece, so that the surface is formed at the welded portion. Since the nugget diameter can be increased, the amount of heat generated at the welded portion during large current discharge can be reduced.
【００１１】[0011]
【発明の実施の形態】以下、図面を参照して本発明が適
用可能なリチウム二次電池の実施の形態について説明す
る。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a lithium secondary battery to which the present invention can be applied will be described with reference to the drawings.
【００１２】図２に示すように、本実施形態のリチウム
二次電池としてのリチウムイオン電池２０は、中空円筒
状でポリプロピレン製の捲芯５を捲回中心として正極板
と負極板とをポリエチレン製セパレータを介して断面渦
巻状に捲回した電極捲回群６を備えている。電極捲回群
６は、リチウムイオン電池２０の容器となる導電性の有
底電池容器４内に収容されている。電池容器４は、厚さ
０．５ｍｍのＳＰＣＣを用い、深絞り加工で成形された
後、内面を含めてニッケルの電気メッキが施されてい
る。As shown in FIG. 2, a lithium ion battery 20 as a lithium secondary battery according to the present embodiment has a hollow cylindrical hollow core 5 made of polypropylene and a positive electrode plate and a negative electrode plate made of polyethylene. An electrode winding group 6 wound spirally in cross section via a separator is provided. The electrode winding group 6 is housed in a conductive bottomed battery container 4 serving as a container of the lithium ion battery 20. The battery case 4 is formed by deep drawing using SPCC having a thickness of 0.5 mm, and is then subjected to nickel electroplating including the inner surface.
【００１３】正極板は、正極活物質としてのマンガン酸
リチウム（ＬｉＭｎ２Ｏ４）、導電助剤の黒鉛、結着剤
のポリフッ化ビニリデン（ＰＶＤＦ）を使用して正極活
物質合剤とし、正極活物質合剤を正極集電体としてのア
ルミニウム箔の両表面に正極集電端子となる正極リード
片９の部分を除いて実質的に均等に塗布することにより
作製されている。一方、負極板は、負極活物質としての
非晶質炭素、結着剤のポリフッ化ビニリデンを使用して
負極活物質合剤とし、負極活物質合剤を負極集電体とし
ての銅箔の両表面に負極集電端子となる負極リード片８
の部分を除いて実質的に均等に塗布することにより作製
されている。The positive electrode plate is made of a positive electrode active material mixture using lithium manganate (LiMn 2 O 4 ) as a positive electrode active material, graphite as a conductive agent, and polyvinylidene fluoride (PVDF) as a binder. The active material mixture is substantially uniformly applied to both surfaces of an aluminum foil as a positive electrode current collector except for a portion of a positive electrode lead piece 9 serving as a positive electrode current collector terminal. On the other hand, the negative electrode plate is made of an amorphous carbon as a negative electrode active material, a negative electrode active material mixture using polyvinylidene fluoride as a binder, and a copper foil as a negative electrode current collector using the negative electrode active material mixture. Negative electrode lead piece 8 serving as negative electrode current collecting terminal on the surface
It is manufactured by applying substantially evenly except for the part.
【００１４】図１及び図２に示すように、電極捲回群６
の負極板からは銅製の負極リード片８が電池容器４の底
側へ導出されており、平板円盤状の負極集電板１の平板
部１ｂの周縁にレーザ溶接で接合されている。負極集電
板１は、後述する所定厚、銅若しくは銅合金、又は、こ
れとニッケル若しくはニッケル合金とのクラッド材から
プレスによる切り曲げ加工で、一対の舌状突起１ａが対
向するように上方に立設されており、舌状突起１ａがプ
レスにより抜かれた箇所に連通穴としての貫通穴１ｄが
形成されている。また、負極集電板１の中心で舌状突起
１ａの間には、舌状突起１ａが立設された面の背面側、
すなわち、負極リード片８が周囲に接合された接合面の
背面側に凸設した抵抗溶接用のプロジェクション１ｃが
形成されている。更に、舌状突起１ａは捲芯５の中空部
２２に挿入されており、プロジェクション１ｃは電池容
器４の底面に抵抗溶接で接合されている。As shown in FIGS. 1 and 2, the electrode winding group 6
A negative electrode lead piece 8 made of copper is led out from the negative electrode plate to the bottom side of the battery case 4 and is joined to the periphery of the flat plate portion 1b of the flat disk-shaped negative electrode current collector plate 1 by laser welding. The negative electrode current collector plate 1 is formed by cutting and bending a predetermined thickness, which will be described later, of copper or a copper alloy, or a clad material of the same and nickel or a nickel alloy by pressing, so that a pair of tongue-shaped projections 1a face each other. The through-hole 1d is formed as a communication hole at a position where the tongue-shaped protrusion 1a is removed by pressing. Further, between the tongue-shaped protrusions 1a at the center of the negative electrode current collector plate 1, the back side of the surface on which the tongue-shaped protrusions 1a are erected,
That is, the projection 1c for resistance welding is formed so as to protrude on the back side of the joint surface where the negative electrode lead piece 8 is joined to the periphery. Further, the tongue-shaped projection 1a is inserted into the hollow portion 22 of the winding core 5, and the projection 1c is joined to the bottom surface of the battery container 4 by resistance welding.
【００１５】また、捲芯５の下端は、負極集電板１の平
板部１ｂの接合面側に、貫通穴１ｄを跨ぐように当接固
定されている。従って、捲芯５の外径の周りに電極捲回
群６の下端と電池容器４の底面との間に形成された空間
２１は、負極集電板１の貫通穴１ｄにより、捲芯５の中
空部２２に連通されている。一方、電極捲回群６の正極
板からはアルミニウム合金製の正極リード片９が電池容
器４の上側へ導出されている。この導出された正極リー
ド片９は、厚さ１ｍｍのアルミニウム合金Ａ３００３か
らプレスによる深絞り加工でスリーブが中央下方向に形
成された円盤状の正極集電板のフランジ部に抵抗溶接で
接合されている。正極集電板７は、スリーブが捲芯５の
上端部内径に挿入されており、捲芯５に固定されてい
る。The lower end of the winding core 5 is fixedly abutted on the joint surface side of the flat plate portion 1b of the negative electrode current collector plate 1 so as to straddle the through hole 1d. Therefore, a space 21 formed between the lower end of the electrode winding group 6 and the bottom surface of the battery container 4 around the outer diameter of the winding core 5 is formed by the through hole 1 d of the negative electrode current collector plate 1. It is communicated with the hollow part 22. On the other hand, a positive electrode lead piece 9 made of an aluminum alloy is led out of the positive electrode plate of the electrode winding group 6 to the upper side of the battery container 4. This lead-out positive electrode lead piece 9 is joined by resistance welding to a flange portion of a disk-shaped positive electrode current collector plate in which a sleeve is formed downward in the center by deep drawing by pressing from a 1 mm-thick aluminum alloy A3003. I have. The positive electrode current collector plate 7 has a sleeve inserted into the inner diameter of the upper end of the core 5 and is fixed to the core 5.
【００１６】正極集電板７は正極リード板１９の一端に
接合されており、正極リード板１９の他端は封口電池蓋
群１６の内側に配置された皿状の上蓋ケース下面に接合
されている。封口電池蓋群１６は、この上蓋ケース、電
池内圧が所定圧となると開裂して内圧を外部に開放する
安全弁１７、安全弁１７を挟んで周縁部を上蓋ケースの
周縁部でカシメられ正極外部端子として電池外部へ露出
される導電性の上蓋キャップ及び上蓋ケースの皿底部外
面周縁に配置され安全弁１７を押さえるリング状の弁押
さえで一体に構成されている。なお、上蓋キャップの凸
部（正極外部端子）が立設された側面には、電池内圧を
外部に開放するための数個の開放孔が形成されている。The positive electrode current collector 7 is joined to one end of a positive electrode lead plate 19, and the other end of the positive electrode lead plate 19 is joined to the lower surface of a dish-shaped upper lid case arranged inside the sealed battery lid group 16. I have. The closed battery lid group 16 is formed by the upper lid case, a safety valve 17 that is opened when the battery internal pressure reaches a predetermined pressure and releases the internal pressure to the outside, and a peripheral portion of the safety valve 17 is caulked by the peripheral portion of the upper lid case as a positive electrode external terminal. It is integrally formed with a conductive upper lid cap exposed to the outside of the battery and a ring-shaped valve retainer disposed on the outer peripheral edge of the bottom of the dish of the upper lid case and holding the safety valve 17. In addition, several opening holes for releasing the internal pressure of the battery to the outside are formed on the side surface of the upper cap where the convex portion (positive electrode external terminal) is erected.
【００１７】封口電池蓋群１６は、電気的絶縁性及び耐
熱性を有する絶縁部材を介して電池容器４の上部でカシ
メられて密封されている。また、リチウムイオン電池２
０には、電池容器４内に図示しないエチレンカーボネー
ト、ジメチルカーボネート及ジエチルカーボネートの混
合溶媒に６フッ化リン酸リチウム（ＬｉＰＦ６）を加え
た図示しない非水電解液が所定量注入されており、電極
捲回群６はこの図示しない非水電解液に浸潤されてい
る。The sealed battery lid group 16 is caulked and sealed at the top of the battery container 4 via an insulating member having electrical insulation and heat resistance. In addition, lithium ion battery 2
0, a predetermined amount of a non-aqueous electrolyte (not shown) obtained by adding lithium hexafluorophosphate (LiPF 6 ) to a mixed solvent of ethylene carbonate, dimethyl carbonate, and diethyl carbonate (not shown) is injected into the battery container 4. The electrode winding group 6 is impregnated with the non-aqueous electrolyte (not shown).
【００１８】[0018]
【実施例】次に、上記実施形態に従って、上述した負極
集電板１の厚さ、材質や電極捲回群６及び電池容器４の
外径等を変更することにより容量を変更して作製したリ
チウムイオン電池の実施例について説明する。なお、以
下の実施例では、リチウム電池の長さを電池容器４の外
径の４倍に設定した。EXAMPLE Next, according to the above-described embodiment, the negative electrode current collector 1 was manufactured by changing the capacity by changing the thickness, the material, the outer diameter of the electrode winding group 6 and the battery container 4 and the like. An example of a lithium ion battery will be described. In the following examples, the length of the lithium battery was set to four times the outer diameter of the battery container 4.
【００１９】（実施例１）下表１に示すように、実施例
１では、負極集電板１に厚さ０．５ｍｍの無酸素銅Ｃ１
０２０を使用し、電池容器４の外径４０ｍｍ、電極捲回
群６の外径３８ｍｍ、設計容量４Ａｈのリチウムイオン
電池２０を作製した。Example 1 As shown in Table 1 below, in Example 1, a 0.5 mm-thick oxygen-free copper C1
Using 020, a lithium ion battery 20 having an outer diameter of the battery container 4 of 40 mm, an outer diameter of the electrode winding group 6 of 38 mm, and a designed capacity of 4 Ah was produced.
【表１】 [Table 1]
【００２０】（実施例２）表１に示すように、実施例２
では、負極集電板１に厚さ０．５ｍｍの無酸素銅Ｃ１０
２０を使用し、電池容器４の外径６７ｍｍ、電極捲回群
６の外径６５ｍｍ、設計容量２０Ａｈのリチウムイオン
電池２０を作製した。(Embodiment 2) As shown in Table 1, Embodiment 2
Then, the oxygen-free copper C10 having a thickness of 0.5 mm
Using 20, a lithium ion battery 20 having an outer diameter of 67 mm of the battery container 4, an outer diameter of the electrode winding group 6 of 65 mm, and a designed capacity of 20 Ah was produced.
【００２１】（実施例３）表１に示すように、実施例３
では、負極集電板１に厚さ０．３ｍｍの無酸素銅Ｃ１０
２０と厚さ０．３ｍｍのニッケルＮＬＣＰとのクラッド
材を使用し銅側に負極リード片８を溶接し、ニッケル側
を電池容器４の底面に抵抗溶接して電池容器４の外径６
７ｍｍ、電極捲回群６の外径６５ｍｍ、設計容量２０Ａ
ｈのリチウムイオン電池２０を作製した。(Embodiment 3) As shown in Table 1, Embodiment 3
Then, a 0.3 mm-thick oxygen-free copper C10
A negative electrode lead piece 8 is welded to the copper side using a clad material of 20 and 0.3 mm thick nickel NLCP, and the nickel side is resistance-welded to the bottom surface of the battery case 4 to form an outer diameter 6 of the battery case 4.
7 mm, outer diameter of electrode winding group 6 65 mm, design capacity 20 A
h of lithium ion battery 20 was produced.
【００２２】（試験・評価）以上のように作製した各実
施例の電池について各種の充放電試験に供した。この充
放電試験の結果、各実施例の電池は１０Ｃまでの充放電
に耐え得ることが判明したが、実施例２の電池の１０Ｃ
（２００Ａ）放電では、負極集電板１のプロジェクショ
ン溶接部の温度が３００°Ｃに達した。一方、実施例３
の電池の１０Ｃ放電では、負極集電板１のプロジェクシ
ョン溶接部の温度は２００°Ｃ未満であった。(Test / Evaluation) The batteries of the respective examples prepared as described above were subjected to various charge / discharge tests. As a result of the charge / discharge test, it was found that the batteries of the examples could withstand charge / discharge up to 10C.
In the (200A) discharge, the temperature of the projection welded portion of the negative electrode current collector plate 1 reached 300 ° C. On the other hand, Example 3
In the 10C discharge of the battery of No. 1, the temperature of the projection welded portion of the negative electrode current collector plate 1 was less than 200 ° C.
【００２３】充放電試験の結果、実施例２の電池は、プ
ロジェクション溶接部の温度が３００°Ｃに達するた
め、長期の使用における劣化が懸念されるが、実施例３
の電池は、負極集電板１をクラッド材とし銅側に負極リ
ード片８を溶接し、ニッケル側を電池容器４の底面に溶
接したので、銅製の負極リード片８との溶接信頼性を確
保しつつ、電池容器４の底面との抵抗溶接時の発熱（が
多くなること）により、溶接部（プロジェクション）に
形成されたナゲット径が実施例２の約１．３倍（面積で
約１．７倍）となり、１０Ｃ放電でも長期耐用可能な温
度にまで抑えることができた。As a result of the charge / discharge test, the temperature of the projection welded portion of the battery of Example 2 reaches 300 ° C., which may cause deterioration during long-term use.
Since the negative electrode current collector plate 1 was used as a cladding material and the negative electrode lead piece 8 was welded to the copper side and the nickel side was welded to the bottom surface of the battery container 4, welding reliability with the copper negative electrode lead piece 8 was secured. Meanwhile, due to heat generation (increased) during resistance welding with the bottom surface of the battery container 4, the diameter of the nugget formed at the welded portion (projection) is about 1.3 times that of the second embodiment (about 1. 7 times), and it was possible to suppress the temperature to a temperature that can be used for a long time even with 10C discharge.
【００２４】また、上記各実施例の電池を故意に過充電
状態とし、それらの挙動を調べる過充電試験に供した。
過充電試験の結果、いずれの電池も、空間２１に発生し
た高圧ガスは貫通穴１ｄを介して捲芯５の中空部２２へ
と導かれて安全弁１７からリチウムイオン電池２０の外
部に放出され、電池容器４の破損に至らないことが確認
された。Further, the batteries of the above embodiments were intentionally overcharged and subjected to an overcharge test for examining their behavior.
As a result of the overcharge test, in any of the batteries, the high-pressure gas generated in the space 21 was guided to the hollow portion 22 of the winding core 5 through the through hole 1d and released from the safety valve 17 to the outside of the lithium ion battery 20, It was confirmed that the battery container 4 was not damaged.
【００２５】以上のように、本実施形態によれば、負極
集電板１をプレス加工によって安価に作製でき、かつ、
従来技術のように負極リード板１１を必要としない負極
集電板１の単一部品で構成できるので、大型リチウムイ
オン電池を、より低コストで量産することができる。As described above, according to the present embodiment, the negative electrode current collector 1 can be manufactured at low cost by press working, and
Unlike the related art, the negative electrode current collector plate 1 does not require the negative electrode lead plate 11 and can be composed of a single component, so that a large-sized lithium ion battery can be mass-produced at lower cost.
【００２６】また、本実施形態によれば、従来技術のよ
うに大型リチウム二次電池にガス排出のための空間１２
を設ける必要がないので、例えば、上述した実施例１の
電池の場合で、極板の幅を約６ｍｍ大きくすることがで
き、電池容量をおよそ５％増加させることができる。従
って、リチウムイオン電池２０の高容量化、小型化を図
ることができる。Further, according to the present embodiment, the space 12 for discharging gas is provided in the large-sized lithium secondary battery as in the prior art.
Therefore, for example, in the case of the above-described battery of the first embodiment, the width of the electrode plate can be increased by about 6 mm, and the battery capacity can be increased by about 5%. Therefore, the capacity and size of the lithium ion battery 20 can be increased.
【００２７】なお、本実施形態では、舌状突起１ａの形
状として、半円形の舌状突起の例を示したが、円形状、
楕円形状、方形状などでも同様の効果を得ることができ
る。また、本実施形態では、一対の舌状突起１ａを設け
る例を示したが、突起の数も２つに限定されるものでは
なく、単数個でも複数個でも良い。更に、本実施形態で
は、負極集電板１の中心部に一つのプロジェクション１
ｃを凸設する例を示したが、このプロジェクション１ｃ
の位置及び数はこれに限定されるものではない。In this embodiment, a semicircular tongue-shaped projection is shown as an example of the shape of the tongue-shaped projection 1a.
Similar effects can be obtained with an elliptical shape, a square shape, and the like. Further, in the present embodiment, the example in which the pair of tongue-shaped protrusions 1a are provided is shown, but the number of protrusions is not limited to two, and may be one or more. Furthermore, in the present embodiment, one projection 1 is provided at the center of the negative electrode current collector 1.
The example in which the projection c is projected is shown in the projection 1c.
Is not limited to this.
【００２８】[0028]
【発明の効果】以上説明したように、本発明によれば、
平板状の負極集電板の周縁部に負極から導出されたリー
ド片が接合されており、該接合面の背面が電池容器の底
面に接合されているので、大電流放電時にも使用に耐え
ることができ、負極から導出されたリード片が負極集電
板の平板状の接合面に接合されており、周縁が電池容器
の底面側にリング状に折り曲げられていないので、負極
集電板の高さ方向のサイズを小さくすることができ、負
極集電板に、捲芯の外径の周りに電極捲回群の下端及び
電池容器の底面間で画定される空間と軸芯の中空部とを
連通する連通穴が形成されているので、安全性を確保し
つつ負極集電板を単一部品で構成することができるた
め、リチウム二次電池の高容量化を図ることができると
共に、部品点数を削減することができる、という効果を
得ることができる。As described above, according to the present invention,
A lead piece derived from the negative electrode is joined to the periphery of the flat negative electrode current collector plate, and the back surface of the joining surface is joined to the bottom surface of the battery container. The lead piece led out from the negative electrode is joined to the flat joining surface of the negative electrode current collector plate, and the periphery is not bent into a ring shape on the bottom side of the battery container. In the negative electrode current collector plate, the space defined between the lower end of the electrode winding group and the bottom surface of the battery container around the outer diameter of the winding core and the hollow portion of the shaft core can be reduced. Since the communication holes are formed, the negative electrode current collector can be composed of a single component while ensuring safety, so that the capacity of the lithium secondary battery can be increased and the number of components can be reduced. Can be reduced.
【図面の簡単な説明】[Brief description of the drawings]
【図１】本発明が適用可能な実施形態のリチウム二次電
池の負極集電板の外観斜視図である。FIG. 1 is an external perspective view of a negative electrode current collector plate of a lithium secondary battery according to an embodiment to which the present invention can be applied.
【図２】本発明が適用可能な実施形態のリチウム二次電
池の断面図である。FIG. 2 is a cross-sectional view of a lithium secondary battery according to an embodiment to which the present invention can be applied.
【図３】従来の小型リチウム二次電池の断面斜視図であ
る。FIG. 3 is a sectional perspective view of a conventional small lithium secondary battery.
【図４】従来の大型リチウム二次電池の断面図である。FIG. 4 is a cross-sectional view of a conventional large-sized lithium secondary battery.
１ 負極集電板 １ａ 舌状突起 １ｂ 平板部 １ｃ プロジェクション １ｄ 貫通穴（連通穴） ４ 電池容器 ５ 捲芯 ６ 電極捲回群 ８ 負極リード片（リード片） ２０ リチウムイオン電池 ２１ 空間 ２２ 中空部 DESCRIPTION OF SYMBOLS 1 Negative electrode current collecting plate 1a Tongue-like protrusion 1b Flat plate part 1c Projection 1d Through hole (communication hole) 4 Battery container 5 Core 6 Electrode winding group 8 Negative lead piece (lead piece) 20 Lithium ion battery 21 Space 22 Hollow
フロントページの続き Ｆターム(参考） 5H022 AA09 AA18 BB02 BB16 CC22 CC30 EE01 EE03 5H029 AJ14 AK03 AL08 AM03 AM05 AM07 BJ02 BJ14 DJ07 EJ01Continuation of the front page F term (reference) 5H022 AA09 AA18 BB02 BB16 CC22 CC30 EE01 EE03 5H029 AJ14 AK03 AL08 AM03 AM05 AM07 BJ02 BJ14 DJ07 EJ01
Claims (3)
で中空円筒状の捲芯に捲回された電極捲回群を電池容器
内に収容したリチウム二次電池において、前記負極から
導出されたリード片が周縁部に接合され、該接合面の背
面が前記電池容器の底面に接合された平板状の負極集電
板を備え、該負極集電板には前記捲芯の外径の周りに前
記電極捲回群の下端及び前記電池容器の底面間で画定さ
れる空間と前記軸芯の中空部とを連通する連通穴が形成
されたことを特徴とするリチウム二次電池。1. A lithium secondary battery in which a positive electrode and a negative electrode are made of synthetic resin via a separator and wound around a hollow cylindrical core in a lithium secondary battery housed in a battery container. A lead piece is joined to the peripheral portion, and a back surface of the joining surface is provided with a flat negative electrode current collector plate joined to the bottom surface of the battery container, and the negative electrode current collector plate is provided around the outer diameter of the winding core. A lithium secondary battery, wherein a communication hole communicating a space defined between a lower end of the electrode winding group and a bottom surface of the battery container and a hollow portion of the shaft core is formed.
による切り曲げ加工で形成され前記捲芯の中空部に挿入
される舌状突起が立設されており、前記背面に凸設され
前記電池容器の底面に溶接されるプロジェクションを有
することを特徴とする請求項１に記載のリチウム二次電
池。2. The negative electrode current collector plate has a tongue-shaped projection formed on the joining surface by cutting and bending by a press and inserted into a hollow portion of the winding core, and protruding from the back surface. The lithium secondary battery according to claim 1, further comprising a projection welded to a bottom surface of the battery container.
ッケル又はニッケル合金と、のクラッド材であり、該銅
又は銅合金側が前記リード片に溶接され、ニッケル又は
ニッケル合金側が前記電池容器の底面に抵抗溶接されて
いることを特徴とする請求項１又は請求項２に記載のリ
チウム二次電池。3. The negative electrode current collector plate is a clad material of copper or a copper alloy and nickel or a nickel alloy, the copper or copper alloy side is welded to the lead piece, and the nickel or nickel alloy side is the battery. The lithium secondary battery according to claim 1, wherein the lithium secondary battery is resistance-welded to a bottom surface of the container.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000323456A JP3627645B2 (en) | 2000-10-24 | 2000-10-24 | Lithium secondary battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000323456A JP3627645B2 (en) | 2000-10-24 | 2000-10-24 | Lithium secondary battery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2002134095A true JP2002134095A (en) | 2002-05-10 |
| JP3627645B2 JP3627645B2 (en) | 2005-03-09 |
Family
ID=18801118
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000323456A Expired - Fee Related JP3627645B2 (en) | 2000-10-24 | 2000-10-24 | Lithium secondary battery |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3627645B2 (en) |
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| CN110492107A (en) * | 2019-08-26 | 2019-11-22 | 英诺激光科技股份有限公司 | A method of preparing lithium battery porous copper foil collector |
| WO2023063794A1 (en) * | 2021-10-14 | 2023-04-20 | 주식회사 엘지에너지솔루션 | Welding mask and welding method |
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