JP2001185225A - Lithium secondary battery - Google Patents
Lithium secondary batteryInfo
- Publication number
- JP2001185225A JP2001185225A JP37526999A JP37526999A JP2001185225A JP 2001185225 A JP2001185225 A JP 2001185225A JP 37526999 A JP37526999 A JP 37526999A JP 37526999 A JP37526999 A JP 37526999A JP 2001185225 A JP2001185225 A JP 2001185225A
- Authority
- JP
- Japan
- Prior art keywords
- power generating
- battery
- current collector
- positive electrode
- generating 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.)
- 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、大容量を有するリ
チウム二次電池に関する。The present invention relates to a lithium secondary battery having a large capacity.
【０００２】[0002]
【従来の技術】電気自動車等に用いられる大容量のリチ
ウム二次電池の従来の構成例を説明する。このリチウム
二次電池は、図５に示されるように、方形箱型の電池容
器１内に巻回型の発電要素７が収納されている。発電要
素７は、帯状の正負の電極を帯状のセパレータを介して
円筒形に巻回したものである。これらの正負の電極は、
それぞれ巻回軸方向に少しずつずらして巻回することに
より、一方の端面には正極の端部を突出させ、他方の端
面には負極の端部を突出させている。そして、この発電
要素７の一方の端面に正極端子４の集電体４ａが配置さ
れ、ここに突出する正極の端部が接続されると共に、他
方の端面に負極端子３の集電体３ａが配置され、ここに
突出する負極の端部が接続されている。また、これらの
正極端子４と負極端子３の先端部は、電池容器１の端面
から封止材等によって絶縁封止されて外部に出されてい
る。2. Description of the Related Art An example of a conventional structure of a large-capacity lithium secondary battery used for an electric vehicle or the like will be described. In this lithium secondary battery, as shown in FIG. 5, a winding type power generating element 7 is housed in a rectangular box-shaped battery container 1. The power generating element 7 is formed by winding a band-shaped positive and negative electrode into a cylindrical shape via a band-shaped separator. These positive and negative electrodes are
By winding each of them slightly shifted in the winding axis direction, the end of the positive electrode protrudes from one end surface, and the end of the negative electrode protrudes from the other end surface. The current collector 4a of the positive electrode terminal 4 is arranged on one end face of the power generating element 7, and the end of the positive electrode protruding here is connected, and the current collector 3a of the negative electrode terminal 3 is connected to the other end face. It is arranged and the end of the negative electrode protruding here is connected. Further, the tips of the positive electrode terminal 4 and the negative electrode terminal 3 are insulated and sealed from the end surfaces of the battery container 1 by a sealing material or the like, and are exposed to the outside.
【０００３】[0003]
【発明が解決しようとする課題】電池の容量を大きくす
る為には、電池内部に収納されている発電要素を大きく
することが必要であるが、大きくなればなるほど発電要
素を構成する電極等の面積も大きくなり、均一な集電状
態を保つのが難しくなり、また、巻回機の性能に左右さ
れるような製造技術上の問題もあり、大きな発電要素を
製造するのは難しい。そして、発電要素の性能、製造技
術等を考慮した場合、リチウム二次電池の場合で４００
Ａｈが限界値である。In order to increase the capacity of the battery, it is necessary to increase the size of the power generating element housed in the battery. The area is large, it is difficult to maintain a uniform current collecting state, and there is a problem in the manufacturing technology that depends on the performance of the winding machine. Therefore, it is difficult to manufacture a large power generation element. In consideration of the performance of the power generation element, manufacturing technology, and the like, in the case of a lithium secondary battery, 400
Ah is the limit value.
【０００４】また、方形箱型の電池ケース内に円筒形の
発電要素を収納すると、電池容器と発電要素との間に隙
間が生じ、電池としてのエネルギー密度が低下するとい
う問題もあった。Further, when a cylindrical power generating element is accommodated in a rectangular box-shaped battery case, there is a problem that a gap is formed between the battery container and the power generating element, thereby lowering the energy density of the battery.
【０００５】そこで、このような隙間を減らす為に、発
電要素を長円筒形にすることが考えられ、さらに、大き
な発電要素を使用せずに大容量の電池を作製する方法と
して、この長円筒形の発電要素を複数個その側面平坦部
を合わせるようにして電池容器内に収納するという方法
が考えられた。そして、このような構造の電池を採用す
ることによって、電池容器内の隙間が少なく容量密度が
大きい、かつ、発電要素を複数収納することで容量の大
きな電池の製造が可能となった。In order to reduce such a gap, it is conceivable to make the power generating element a long cylindrical shape. Further, as a method of manufacturing a large-capacity battery without using a large power generating element, this long cylindrical shape is used. A method has been conceived in which a plurality of shaped power generating elements are housed in a battery container with their side flat portions matched. By employing a battery having such a structure, it is possible to manufacture a battery having a small capacity in the battery container, a large capacity density, and a large capacity by accommodating a plurality of power generating elements.
【０００６】しかしながら、電池の容量が大きくなるこ
とにより、これまでの電池ではなかったような大きな電
流が電池内を流れるようになって電池内部での発熱量が
多くなり、さらに、発電要素を複数並べることにより、
一つの場合に比べて発電要素からの放熱が悪くなって温
度上昇を生じ易くなるという問題が生じるようになっ
た。[0006] However, as the capacity of the battery increases, a large current, which has not been the case with conventional batteries, flows through the battery, increasing the amount of heat generated inside the battery. By arranging,
As compared with one case, the heat radiation from the power generating element is deteriorated, so that a problem that the temperature easily rises is caused.
【０００７】以上に鑑み、本発明は、複数個の発電要素
が収納された電池における放熱性を向上させることを目
的とするものである。[0007] In view of the above, an object of the present invention is to improve the heat radiation of a battery containing a plurality of power generating elements.
【０００８】[0008]
【課題を解決するための手段】本発明のリチウム二次電
池は、長円筒形の発電要素が複数個、長円筒形の平坦な
側面同士が合わさるように電池容器内に収納され、該電
池容器と発電要素との間に放熱用の固体部材が配置され
ていることを特徴とする。According to the lithium secondary battery of the present invention, a plurality of long cylindrical power generating elements are housed in a battery container so that flat long sides of the long cylindrical shape are aligned with each other. A heat radiation solid member is disposed between the power generation element and the power generation element.
【０００９】このように、電池容器と発電要素との間に
放熱用の固体部材が配置されることによって、固体部材
を通して発電要素で発生した熱が電池容器へと効率よく
伝わるようになり、放熱性能が改善する。さらに、固体
の部材を用いることによって、発電要素の動きが制限さ
れ、電池が振動等した場合にも発電要素の動きが抑制さ
れるようになる。なお、放熱用の固体部材は、電池容器
と発電要素との間の隙間を埋めるように配置するのが良
い。As described above, by disposing the heat radiating solid member between the battery case and the power generating element, the heat generated in the power generating element can be efficiently transmitted to the battery case through the solid member, and Performance is improved. Further, by using a solid member, the movement of the power generating element is restricted, and the movement of the power generating element is suppressed even when the battery is vibrated. The heat dissipating solid member is preferably arranged so as to fill a gap between the battery case and the power generating element.
【００１０】[0010]
【発明の実施の形態】具体的な実施形態について説明す
ることにより、本発明についてさらに説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be further described by describing specific embodiments.
【００１１】本発明のリチウム二次電池は、長円筒形の
発電要素が複数個、長円筒形の平坦な側面同士が合わさ
るように電池容器内に収納され、該電池容器と発電要素
との間の隙間を埋めるように放熱用の固体部材が配置さ
れていることを特徴とするものである。In the lithium secondary battery of the present invention, a plurality of long cylindrical power generating elements are housed in a battery container such that the flat surfaces of the long cylindrical shape are aligned with each other. Wherein a solid member for heat radiation is arranged to fill the gap.
【００１２】長円筒形の発電要素とは、例えば、円筒型
の発電要素の側面を平板で挟んで変形させて得られるよ
うな形状の発電要素を意味し、巻軸方向に垂直な断面の
形状が長円を有するものをいい、平坦な側面はこの長円
の曲率の大きい部分（または直線部分）によって形成さ
れる側面部をいう。そして、この長円の形としては、隙
間を少なくするという理由から、直線部と円弧部とから
形成されるような形状であるのがより好ましい。The long cylindrical power generating element means, for example, a power generating element having a shape obtained by deforming a cylindrical power generating element by sandwiching a side face between flat plates, and having a cross section perpendicular to the winding axis direction. Has an ellipse, and the flat side surface refers to a side portion formed by a portion (or a straight line portion) of the ellipse having a large curvature. The shape of the ellipse is more preferably a shape formed by a straight line portion and a circular arc portion because the gap is reduced.
【００１３】図４は従来例と本実施形態での無駄なスペ
ースの割合を比較した図である。この図からも理解され
るように、円筒形の発電要素７が１個だけ配置される場
合（同図（Ａ））には、この発電要素をできるだけ隙間
なく方形箱型の電池ケース１に収納しても、約２２％の
スペース（Ｇ１）の無駄が生じるのに比べ、このような
長円筒形の発電要素２を２個以上配置（同図（Ｂ））す
ることで、同じ方形箱型の電池ケース１にできるだけ隙
間なく収納すれば、スペース（Ｇ２）の無駄を約１１％
以下に減少させることができる。さらに、４個以上配置
（同図（Ｃ））することで、スペース（Ｇ３）の無駄を
さらに約５％以下まで減少させることができ、１０個以
上配置することで、さらに約２％以下まで減少させるこ
とができる。FIG. 4 is a diagram comparing the ratio of wasted space between the conventional example and this embodiment. As can be understood from this figure, when only one cylindrical power generating element 7 is arranged (FIG. 1A), this power generating element is stored in the rectangular box-shaped battery case 1 with as little space as possible. However, compared to the waste of about 22% of the space (G1), by disposing two or more such long cylindrical power generating elements 2 (FIG. 2B), the same rectangular box type can be obtained. Space (G2) waste by about 11%
It can be reduced to: Furthermore, by arranging four or more (FIG. (C)), the waste of the space (G3) can be further reduced to about 5% or less, and by arranging 10 or more, further to about 2% or less. Can be reduced.
【００１４】固体部材は、例えば、隙間形状に合わせて
成形され、その材質としては、ＰＰ、ＰＥ、ＰＰＳ等の
合成樹脂、金属等を用いることができるが、できるだけ
軽く、熱伝導率の大きいものが良い。また、電池内に電
解液が存在する場合には、耐電解液性を有するものを用
いるのが良い。そしてこれらの条件を満たす材質とし
て、中でもアルミニウムまたはアルミニウム合金が適し
ている。なお、金属を用いる場合には、発電要素との間
の電気的絶縁に注意を払う必要が有り、これは例えば、
発電要素表面にポリイミドフィルム等の絶縁フィルムを
形成する等して行うことが出来る。また、固体部材と発
電要素または容器との接触も熱的に良好、すなわち熱伝
達が良好なものとなるようにするのが好ましく、例え
ば、互いに密着するようにするのが良い。The solid member is formed, for example, in accordance with the shape of the gap. As the material thereof, a synthetic resin such as PP, PE, PPS or the like, a metal or the like can be used. Is good. When an electrolytic solution is present in the battery, it is preferable to use one having resistance to the electrolytic solution. As a material satisfying these conditions, aluminum or an aluminum alloy is particularly suitable. When using a metal, it is necessary to pay attention to the electrical insulation between the power generating element, for example,
It can be performed by forming an insulating film such as a polyimide film on the surface of the power generating element. Further, it is preferable that the contact between the solid member and the power generation element or the container is also thermally good, that is, the heat transfer is good. For example, the solid members are preferably in close contact with each other.
【００１５】本発明で用いられる発電要素の大きさとし
ては、好ましくは４０Ａｈ以上のもので４００Ａｈ以下
のものを用いるのが良く、電池容量としては、１００Ａ
ｈ以上、より好ましくは４００Ａｈ以上であるのが好ま
しい。これは、従来の発電要素が1個収納された電池に
比べて本発明の電池は構造が複雑となるのであるが、こ
のような大きさのものを用いた場合に、このような構造
の複雑さを考慮してもなお、容量の大きさ、容量密度の
点でより有利な電池とすることが出来るからである。そ
して、これら発電要素は互いに並列接続されるようにし
て用いられるのが、このような容量の観点から好まし
い。なお、上記容量は、いわゆる定格容量と同じものと
考えて良いが、定格容量が明確でない場合には、その電
池の通常の使用状態における満充電状態から１００Ａの
大きさの電流で放電を行い、放電中の電池電圧が２．７
Ｖ未満になるまでの放電持続時間から計算される容量で
判断する。例えば、1時間放電が持続されれば１００Ａ
ｈ、０．４時間であれば４０Ａｈである。The size of the power generating element used in the present invention is preferably 40 Ah or more and 400 Ah or less, and the battery capacity is 100 Ah.
h or more, more preferably 400 Ah or more. This is because the structure of the battery of the present invention is more complicated than that of a conventional battery in which one power generation element is stored. This is because the battery can be more advantageous in terms of the size of the capacity and the capacity density. It is preferable that these power generating elements are used so as to be connected in parallel with each other from the viewpoint of such capacity. The capacity may be considered to be the same as the so-called rated capacity.If the rated capacity is not clear, the battery is discharged with a current of 100 A from a fully charged state in a normal use state, Battery voltage during discharge is 2.7
Judgment is made based on the capacity calculated from the discharge duration until the voltage becomes lower than V. For example, 100A if discharge is maintained for 1 hour
h, 0.4 Ah, 40 Ah.
【００１６】発電要素間の接続、または、発電要素と電
池の外部端子との接続は集電体を用いて行われるが、本
電池は特に大容量を目指した電池である為、例えば電池
が外部で短絡された場合には、非常に大きな電流が流れ
る。そこで、このような場合にも安全性を損なわないよ
うに、発電要素から電流を取出す為の集電体を、その一
部に他の部分よりも電流の通過する断面積が小さくなっ
ている部分を有し、所定の電流値を越えた場合にこの部
分が断線するように構成するのが好ましい。例えば、断
線が生じる電流値を決め、集電体の材質を決めれば、こ
の部分での発熱量が求められる為、これらに基き断面積
を決めるようにすれば良い。なお、材質としては融点の
低いアルミニウムまたはこれの合金が好ましい。例え
ば、Ｃｕの場合には、その融点は約1000℃であり、これ
に対しＡｌの場合には約660℃と低く、短絡電流による
発熱での切断を行い易いからである。The connection between the power generating elements or the connection between the power generating elements and the external terminals of the battery is performed by using a current collector. However, since the present battery is a battery aiming particularly at a large capacity, for example, the battery is connected to the outside. When a short circuit occurs at the terminal, a very large current flows. Therefore, even in such a case, a current collector for extracting current from the power generating element is provided in a part of which has a smaller cross-sectional area through which the current passes than other parts so as not to impair the safety. It is preferable that this portion is disconnected when a predetermined current value is exceeded. For example, if the current value at which a disconnection occurs is determined and the material of the current collector is determined, the calorific value at this portion is determined, and the sectional area may be determined based on these values. Preferably, the material is aluminum having a low melting point or an alloy thereof. For example, in the case of Cu, the melting point is about 1000 ° C., whereas in the case of Al, it is as low as about 660 ° C., and cutting by heat generated by a short-circuit current is easy.
【００１７】さらに、集電体に所定以上の電流が流れた
場合に断線する部分を設ける場合、このような断線部を
設けるのは正極側の集電体とするのがより好ましい。こ
れは、正極集電体材質として上記Ａｌが適しており、上
記切断の容易な材質と一致させることができるからであ
る。Further, in the case where a portion which is disconnected when a current of a predetermined value or more flows through the current collector is provided, it is more preferable to provide such a disconnected portion on the current collector on the positive electrode side. This is because Al is suitable as the material of the positive electrode current collector, and can be made to match the material that is easy to cut.
【００１８】[0018]
【実施例】以下、実施例により本発明についてさらに説
明する。EXAMPLES The present invention will be further described below with reference to examples.
【００１９】図１〜図３は本発明電池の実施例を示すも
のであって、図１はリチウム二次電池の電池ケース内に
２個の発電要素を収納した場合の構造を示す説明図、図
２はこの電池の外観を示す斜視図、図３はリチウム二次
電池の電池ケース内に１０個の発電要素を収納した場合
の構造を示す断面図である。これらリチウム二次電池
は、図２に示す方形箱型の電池ケース１内に、図１に示
すように、長円筒形の巻回型の発電要素２を２個（また
は10個）収納している。電池ケース１は、ステンレス鋼
板の方形容器状の上端開口部に同じステンレス鋼板の方
形の蓋板を溶接で接合したものである。そして、この電
池ケース１の蓋板の両端部に正極端子４と負極端子３の
上端部を突出させている。1 to 3 show an embodiment of the battery of the present invention. FIG. 1 is an explanatory view showing a structure in which two power generating elements are accommodated in a battery case of a lithium secondary battery. FIG. 2 is a perspective view showing the appearance of this battery, and FIG. 3 is a cross-sectional view showing a structure in which ten power generating elements are housed in a battery case of a lithium secondary battery. As shown in FIG. 1, these lithium secondary batteries contain two (or ten) long cylindrical winding type power generating elements 2 in a rectangular box-shaped battery case 1. I have. The battery case 1 is formed by joining a rectangular lid plate made of the same stainless steel plate to a rectangular container-shaped upper end opening of a stainless steel plate by welding. The upper ends of the positive electrode terminal 4 and the negative electrode terminal 3 project from both ends of the cover plate of the battery case 1.
【００２０】発電要素２は、帯状の正負の電極を帯状の
セパレータを介して長円筒形に巻回したものである。正
極は、薄い帯状のアルミニウム箔の一方の端部を除く表
面にリチウムコバルト複合酸化物の正極活物質を塗布し
たものであり、負極は、薄い帯状の銅箔の他方の端部を
除く表面にグラファイトの負極活物質を塗布したもので
ある。電解液には、ＥＣ：ＤＭＣ：ＤＥＣ＝２：２：１
の混合比の混合溶媒にＬｉＰＦ6を1モル／ｌ含有させた
ものを用いている。これらの正負の電極は、それぞれ巻
回軸方向に少しずつずらして巻回することにより、一方
の端面には正極のアルミニウム箔を露出させ、他方の端
面には負極の銅箔を露出させている。このように構成さ
れた発電要素２は、例えば、図１に示されるように、長
円筒形の平坦な側面同士を合わせた形状で、かつ合わせ
たことによって発生する隙間に、円弧状の金属アルミニ
ウム固体部材７（図１では省略されているが、下部にも
同様の形状で上部のものよりも長いものが挿入されてい
る。上部の固体部材は端子を避ける為短くなってい
る。）を挿入した後、電池ケース１内に収納される。な
お、発電要素２の最外面は、ポリイミドフィルムで覆わ
れて絶縁処理されている。The power generating element 2 is formed by winding strip-shaped positive and negative electrodes into a long cylindrical shape via a strip-shaped separator. The positive electrode is a thin strip of aluminum foil coated with a positive electrode active material of lithium cobalt composite oxide on the surface excluding one end, and the negative electrode is formed on the surface of the thin strip of copper foil excluding the other end. The negative electrode active material of graphite is applied. In the electrolytic solution, EC: DMC: DEC = 2: 2: 1
Of a mixed solvent having a mixing ratio of 1 mol / l of LiPF 6 is used. These positive and negative electrodes are wound by being slightly shifted in the winding axis direction to expose the aluminum foil of the positive electrode on one end face and the copper foil of the negative electrode on the other end face. . For example, as shown in FIG. 1, the power generating element 2 configured as described above has a shape in which flat side surfaces of long cylinders are joined together, and an arc-shaped metal aluminum is inserted into a gap generated by the joining. A solid member 7 (not shown in FIG. 1 but having a similar shape but longer than the upper one is inserted into the lower part. The upper solid member is shorter to avoid terminals). After that, it is stored in the battery case 1. Note that the outermost surface of the power generation element 2 is covered with a polyimide film and is insulated.
【００２１】図2に示される電池では、発電要素２は2個
であるが、これら２個の発電要素２は、一方の端面側に
共通の正極集電体６（アルミ ＪＩＳ Ｈ４０００製）
を配置して、ここに突出する正極端部のアルミニウム箔
をそれぞれこの正極集電体６に接続すると共に、他方の
端面側に共通の負極集電体５（銅製）を配置して、ここ
に突出する負極端部の銅箔をそれぞれこの負極集電体５
に接続する。従って、これら２個の発電要素２は、電池
ケース１内で並列に接続されて１個の単電池を構成す
る。正極集電体６と負極集電体５は、それぞれアルミニ
ウム板と銅板を波板状に繰り返し屈曲させたものであ
り、これらの波板状の各間隙に正極のアルミニウム箔や
負極の銅箔を多数枚ずつ挟み込んで両側から押さえ付け
超音波溶接やレーザー溶接等により溶着させることによ
り接続を行う。また、これらの正極集電体６と負極集電
体５には、それぞれ波板状の部分から突出した接続部５
ａ，６ａが形成され、２個の発電要素２の間に挿入され
る。そして、正極集電体６の接続部６ａの上方に突出す
る端部を正極端子４の下端部に接続固定すると共に、負
極集電体５の接続部５ａの上方に突出する端部を負極端
子３の下端部に接続固定する。In the battery shown in FIG. 2, the number of power generating elements 2 is two, and these two power generating elements 2 have a common positive electrode current collector 6 (made of aluminum JIS H4000) on one end face side.
And the aluminum foil at the end of the positive electrode protruding here is connected to this positive electrode current collector 6, and a common negative electrode current collector 5 (made of copper) is disposed on the other end face side. The protruding copper foil at the end of the negative electrode
Connect to Therefore, these two power generating elements 2 are connected in parallel in the battery case 1 to form one unit cell. The positive electrode current collector 6 and the negative electrode current collector 5 are respectively obtained by repeatedly bending an aluminum plate and a copper plate in a corrugated shape, and an aluminum foil of a positive electrode and a copper foil of a negative electrode are provided in each gap between the corrugated plates. Connection is performed by sandwiching a large number of sheets, pressing them from both sides, and welding them by ultrasonic welding, laser welding, or the like. The positive electrode current collector 6 and the negative electrode current collector 5 have connection portions 5 protruding from corrugated portions, respectively.
a, 6a are formed and inserted between the two power generating elements 2. An end of the positive electrode current collector 6 protruding above the connection portion 6a is connected and fixed to the lower end of the positive electrode terminal 4, and an end of the negative electrode current collector 5 protruding above the connection portion 5a is connected to the negative electrode terminal. 3 and fixed to the lower end.
【００２２】図3に示される電池の場合には、発電要素
２が１０個であり、この場合、正極端子部の接続構造
は、上記図2に示される構造と同じである。そして、残
りの部分の発電要素２は、接続部も切断部も備えない集
電体本体のみからなる正極集電体６により、上記同様に
して接続され、これら正極集電体６が互いに接続されて
１０個の発電要素２が並列に接続された構造となってい
る。負極側も同様である。In the case of the battery shown in FIG. 3, the number of power generating elements 2 is ten. In this case, the connection structure of the positive electrode terminal is the same as the structure shown in FIG. The remaining part of the power generating element 2 is connected in the same manner as described above by the positive electrode current collector 6 including only the current collector body having neither the connection portion nor the disconnection portion, and these positive electrode current collectors 6 are connected to each other. 10 power generation elements 2 are connected in parallel. The same applies to the negative electrode side.
【００２３】図2に示される電池の正極集電体６と図10
に示される電池の端部の正極集電体６は、図２に示され
るように、接続部６ａが、切断部６ｂを介して正極集電
体本体６Ｃとつながっており、図10に示される電池の端
部の正極集電体６では、接続部６ａは、端子方向に垂直
な断面で厚さ１ｍｍ、幅５０ｍｍ、断面積５０ｍｍ2で
あり、切断部６ｂは、３ｍｍの長さで接続部６ａと正極
集電体本体６Ｃとをつなぎ、その断面で厚さ０．５ｍ
ｍ、幅１０ｍｍ、断面積５ｍｍ2である。The positive electrode current collector 6 of the battery shown in FIG.
As shown in FIG. 2, in the positive electrode current collector 6 at the end of the battery shown in FIG. 2, the connecting portion 6a is connected to the positive electrode current collector main body 6C via the cutting portion 6b, and as shown in FIG. In the positive electrode current collector 6 at the end of the battery, the connection portion 6a has a thickness of 1 mm, a width of 50 mm, and a cross-sectional area of 50 mm 2 in a cross section perpendicular to the terminal direction, and the cut portion 6b has a length of 3 mm. 6a and the positive electrode current collector main body 6C, and the cross section thereof has a thickness of 0.5 m.
m, width 10 mm, and cross-sectional area 5 mm 2 .
【００２４】そして、正極集電体６は、電池が短絡され
て５０００Ａの電流が流れた場合、切断部６ｂが６６０
℃以上に昇温して切断するようになっている。なお、こ
の場合でも接続部６ａの温度は200℃程度である。When the battery is short-circuited and a current of 5000 A flows, the positive electrode current collector 6 has
The temperature is raised to over ℃ to cut. In this case, the temperature of the connection portion 6a is about 200 ° C.
【００２５】上記正極端子４と負極端子３は、それぞれ
予め電池ケース１の蓋板の両端部の開口孔に上端部を挿
入し、封止材を介してナットでネジ止めすることによっ
て絶縁封止しておく。そして、この後に２個の発電要素
２に接続された正極集電体６と負極集電体５の接続部５
ａ，６ａの上端部をそれぞれ正極端子４と負極端子３の
下端部に接続固定し、2個の発電要素２を長円筒形の平
坦な側面同士をあわせ、かつそのために発生した隙間に
円弧状の金属アルミニウム固体部材７を挿入したもの
を、最後に電池ケース１の方形容器に収納して蓋板を接
合する。The positive electrode terminal 4 and the negative electrode terminal 3 are respectively insulated and sealed by inserting the upper ends thereof into the opening holes at both ends of the cover plate of the battery case 1 and screwing them with nuts via a sealing material. Keep it. Then, after this, the connecting portion 5 of the positive electrode current collector 6 and the negative electrode current collector 5 connected to the two power generation elements 2
a and 6a are connected and fixed to the lower end of the positive terminal 4 and the lower end of the negative terminal 3, respectively. Finally, the one into which the metal aluminum solid member 7 is inserted is housed in the rectangular container of the battery case 1 and the lid plate is joined.
【００２６】下記表１に図5に示すのと同じ構造を有す
る、巻回形の発電要素単体を一つ用いた電池容量４００
Ａｈの方形電池（比較例品）と、上記図3に示す構造で
同じ容量の長円筒形の発電要素２を10個用いてなる電池
容量４００Ａｈの方形電池（実施例品）とについての、
外部短絡試験の結果を示す。なお、電池の容量は、電池
の開放端子電圧が４．１Ｖになるまで充電し、この後、
１００Ａの大きさの電流で定電流放電を行い、放電時の
電池電圧が２．７５Ｖになるまでの間に放電できる電気
量で表している。また、これらの電池は、発電要素の数
とその集電方法が異なるだけで、活物質等その他の構成
は基本的に同じで上記の通りである。A battery capacity 400 using a single wound power generating element having the same structure as shown in FIG.
An Ah square battery (comparative example product) and a 400 Ah battery battery (example product) having a battery capacity of 400 Ah using ten long cylindrical power generating elements 2 having the same capacity and having the structure shown in FIG.
The result of an external short circuit test is shown. The battery capacity was charged until the open terminal voltage of the battery reached 4.1 V, and thereafter,
Constant current discharge is performed with a current of 100 A, and the amount of electricity that can be discharged until the battery voltage at the time of discharge reaches 2.75 V is represented. Also, these batteries are basically the same in other configurations such as the active material as described above, except for the number of power generating elements and the method of collecting power.
【００２７】[0027]
【表１】外部短絡試験結果 [Table 1] External short-circuit test results
【００２８】正極集電体部の温度は、この部分に熱電対
を装着することにより試験時の温度を測定した。The temperature of the positive electrode current collector was measured by attaching a thermocouple to this portion during the test.
【００２９】実施例品では、外部短絡試験直後に通電が
停止し、解体の結果、正極集電体が切断部で切断されて
いるのが確認された。In the example product, the current supply was stopped immediately after the external short-circuit test, and as a result of disassembly, it was confirmed that the positive electrode current collector was cut at the cutting portion.
【００３０】下記表2に、８００Ａで３０分連続放電し
た場合の、電池内温度、電池外表面温度の測定結果を示
す。Table 2 below shows the measurement results of the internal battery temperature and the external battery surface temperature when the battery was continuously discharged at 800 A for 30 minutes.
【００３１】[0031]
【表２】 [Table 2]
【００３２】実施例品では、発電要素の数が増えている
にも拘わらず、従来の構造を有する比較例品より温度上
昇が少なく、放熱高率が非常に良くなっていることが確
認された。It was confirmed that in the example product, although the number of power generating elements was increased, the temperature rise was smaller than that of the comparative example product having the conventional structure, and the heat radiation rate was very good. .
【００３３】[0033]
【発明の効果】本発明によれば、放熱性が良好で安全性
に優れた電池の製造が可能となる。また、集電体に断面
積の小さい部分を設けることにより、短絡時に自動的に
電流を遮断することが可能となる。According to the present invention, it is possible to manufacture a battery having good heat dissipation and excellent safety. In addition, by providing the current collector with a portion having a small cross-sectional area, it is possible to automatically cut off current when a short circuit occurs.
【図１】 ２個の発電要素を収納した場合の構造を示す
説明図。FIG. 1 is an explanatory diagram showing a structure in which two power generation elements are stored.
【図２】 図1の電池の外観を示す斜視図。FIG. 2 is a perspective view showing the appearance of the battery of FIG.
【図３】 １０個の発電要素を収納した場合の構造を示
す断面図。FIG. 3 is a sectional view showing a structure in which ten power generation elements are stored.
【図４】 従来例と実施形態の無駄なスペースの割合を
比較した図。FIG. 4 is a diagram comparing the ratio of wasted space between the conventional example and the embodiment.
【図５】 発電要素1個が収納された電池の構造を示す
構造説明図。FIG. 5 is a structural explanatory view showing the structure of a battery in which one power generation element is stored.
１：電池ケース ２：発電要素 ３：負極
端子 ４：正極端子 ５：負極集電体 ６：正極
集電体 ６ａ：接続部 ６ｂ：切断部 ６ｃ：集
電体本体 ７：固体部材1: Battery case 2: Power generation element 3: Negative electrode terminal 4: Positive electrode terminal 5: Negative electrode current collector 6: Positive electrode current collector 6a: Connection section 6b: Cut section 6c: Current collector body 7: Solid member
───────────────────────────────────────────────────── フロントページの続き Ｆターム(参考） 5H022 AA09 AA18 CC21 EE01 EE04 KK01 5H029 AJ03 AK03 AL07 AM03 AM05 AM07 BJ02 BJ14 BJ22 BJ27 CJ07 DJ02 DJ07 DJ08 EJ01 HJ07 HJ17 HJ19 5H031 AA08 CC05 EE01 HH01 HH08 KK01 ──────────────────────────────────────────────────続 き Continued on front page F term (reference) 5H022 AA09 AA18 CC21 EE01 EE04 KK01 5H029 AJ03 AK03 AL07 AM03 AM05 AM07 BJ02 BJ14 BJ22 BJ27 CJ07 DJ02 DJ07 DJ08 EJ01 HJ07 HJ17 HJ19 5H031 AA01 CC05 EE01
Claims (4)
の平坦な側面同士が合わさるように電池容器内に収納さ
れ、該電池容器と発電要素との間に放熱用の固体部材が
配置されていることを特徴とするリチウム二次電池。1. A long-cylindrical power generating element is housed in a battery container such that flat sides of the long cylindrical shape are aligned with each other, and a solid member for heat dissipation is provided between the battery container and the power generating element. A lithium secondary battery, which is disposed.
あり、これら発電要素が互いに並列接続されていること
を特徴とする請求項１記載のリチウム二次電池。2. The lithium secondary battery according to claim 1, wherein said power generating elements have a capacity of 100 Ah or more, and these power generating elements are connected in parallel with each other.
が、その一部に他の部分よりも電流の通過する断面積が
小さくなっている部分を有し、所定の電流値を越えた場
合にこの部分が断線するように構成されていることを特
徴とする請求項１または２記載のリチウム二次電池。3. A current collector for extracting a current from a power generating element has a portion in which a cross-sectional area through which a current passes is smaller than another portion, and the current collector exceeds a predetermined current value. 3. The lithium secondary battery according to claim 1, wherein the portion is configured to be disconnected in such a case.
金からなる正極集電体であることを特徴とする請求項４
記載のリチウム二次電池。4. The current collector according to claim 4, wherein the current collector is a positive electrode current collector made of aluminum or an alloy thereof.
The lithium secondary battery according to the above.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP37526999A JP4496582B2 (en) | 1999-12-28 | 1999-12-28 | Lithium secondary battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP37526999A JP4496582B2 (en) | 1999-12-28 | 1999-12-28 | Lithium secondary battery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2001185225A true JP2001185225A (en) | 2001-07-06 |
| JP4496582B2 JP4496582B2 (en) | 2010-07-07 |
Family
ID=18505247
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP37526999A Expired - Fee Related JP4496582B2 (en) | 1999-12-28 | 1999-12-28 | Lithium secondary battery |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4496582B2 (en) |
Cited By (17)
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|---|---|---|---|---|
| JP2002008708A (en) * | 2000-06-20 | 2002-01-11 | Denso Corp | Flat wound electrode cell |
| JP2002231297A (en) * | 2001-01-29 | 2002-08-16 | Japan Storage Battery Co Ltd | Battery pack |
| WO2008050604A1 (en) * | 2006-10-24 | 2008-05-02 | Panasonic Corporation | Sealed secondary battery |
| JP2010267457A (en) * | 2009-05-13 | 2010-11-25 | Hitachi Vehicle Energy Ltd | Spiral wound battery |
| JP2011096660A (en) * | 2009-10-29 | 2011-05-12 | Samsung Sdi Co Ltd | Secondary battery |
| JP2012138211A (en) * | 2010-12-24 | 2012-07-19 | Toyota Motor Corp | Secondary battery |
| WO2012117473A1 (en) * | 2011-02-28 | 2012-09-07 | パナソニック株式会社 | Nonaqueous electrolyte rechargeable battery |
| JP2013054900A (en) * | 2011-09-04 | 2013-03-21 | Toyota Industries Corp | Battery |
| JP2013101773A (en) * | 2011-11-07 | 2013-05-23 | Toyota Industries Corp | Secondary battery, temperature adjustment structure of secondary battery, and vehicle equipped with secondary battery |
| JP2013105586A (en) * | 2011-11-11 | 2013-05-30 | Toyota Industries Corp | Electrode body for secondary battery, secondary battery and vehicle |
| US8758917B2 (en) | 2010-05-21 | 2014-06-24 | Toyota Jidosha Kabushiki Kaisha | Secondary battery |
| US8815437B2 (en) | 2009-09-10 | 2014-08-26 | Samsung Sdi Co., Ltd. | Rechargeable battery |
| JP2015069725A (en) * | 2013-09-26 | 2015-04-13 | 株式会社Ｇｓユアサ | Storage element |
| JP2016004633A (en) * | 2014-06-13 | 2016-01-12 | 株式会社Ｇｓユアサ | Power storage element |
| CN113056839A (en) * | 2018-11-28 | 2021-06-29 | 卡尔科德宝两合公司 | Electrochemical energy storage cell |
| JP2022509227A (en) * | 2018-11-28 | 2022-01-20 | カール・フロイデンベルク・カーゲー | Electrochemical energy storage cell |
| JP7462476B2 (en) | 2020-06-01 | 2024-04-05 | 本田技研工業株式会社 | Secondary battery |
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| GB2575981B (en) | 2018-07-30 | 2022-09-07 | Gp Batteries International Ltd | A battery |
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| JP2013101773A (en) * | 2011-11-07 | 2013-05-23 | Toyota Industries Corp | Secondary battery, temperature adjustment structure of secondary battery, and vehicle equipped with secondary battery |
| JP2013105586A (en) * | 2011-11-11 | 2013-05-30 | Toyota Industries Corp | Electrode body for secondary battery, secondary battery and vehicle |
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| JP7462476B2 (en) | 2020-06-01 | 2024-04-05 | 本田技研工業株式会社 | Secondary battery |
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