JP3849733B2 - Nonaqueous electrolyte secondary battery - Google Patents

Nonaqueous electrolyte secondary battery Download PDF

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Publication number
JP3849733B2
JP3849733B2 JP27538597A JP27538597A JP3849733B2 JP 3849733 B2 JP3849733 B2 JP 3849733B2 JP 27538597 A JP27538597 A JP 27538597A JP 27538597 A JP27538597 A JP 27538597A JP 3849733 B2 JP3849733 B2 JP 3849733B2
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Japan
Prior art keywords
plate
outer case
electrolyte secondary
secondary battery
groove
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JPH11111241A (en
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寿 塚本
茂生 小松
丈 佐々木
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GS Yuasa Corp
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GS Yuasa Corp
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    • 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

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  • Sealing Battery Cases Or Jackets (AREA)
  • Gas Exhaust Devices For Batteries (AREA)
  • Secondary Cells (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明は、内部のガス圧力が異常に上昇した場合に外装ケースの一部を開口してガス抜きを行う安全装置を備えた非水電解質二次電池に関する。
【０００２】
【従来の技術】
非水電解質二次電池には、図３に示すように、鉄板を箱型容器状とした外装ケース１に、正極と負極をセパレータを介して楕円形に巻回した発電要素２を収納した角型のものがある。この非水電解質二次電池は、発電要素２の最外周に巻回された負極を直接外装ケース１の内面に接触させることにより、外装ケース１全体が負極端子となるようにしている。なお、この外装ケース１には図示しない蓋が取り付けられて内部が密閉される。また、発電要素２の正極は、この蓋に設けられた正極端子に接続される。しかし、このような非水電解質二次電池は、外装ケース１に鉄板を用いるので、電池重量が重くなるという欠点があった。そこで、最近では、この外装ケース１に軽いアルミニウム板を用いて軽量化を図ることが検討されている。
【０００３】
また、非水電解質二次電池は、水溶液電解質二次電池に比べて反応性の高い材料を使用するので、特に安全性を考慮する必要がある。このため、外装ケース１には、内部のガス圧力が異常に上昇すると、この内圧を開放してガス抜きを行う安全装置が設けられている。また、このような安全装置として、外装ケース１の板面の一部に溝を設け、内圧が所定以上に上昇するとこの溝が破断するようにした切り欠き弁を形成すれば、プレス加工やウエットエッチングにより簡単に加工できるようになりコストダウンを図ることが容易となる。
【０００４】
【発明が解決しようとする課題】
ところが、外装ケース１がアルミニウム板になると、ここを負極にしたのではリチウムと反応するので、発電要素２の正極と接続しなければならず、この発電要素２の極性を逆にする必要が生じる。このため、外装ケース１にアルミニウム板を用いて電池重量の軽量化を図る場合には、外装ケース１に鉄板を用いたときの発電要素２の製造ラインをそのまま利用することができないので、新たな設備投資を要するという問題が生じる。
【０００５】
また、切り欠き弁を用いれば、安全装置の製造コストが安価になるが、外装ケース１が強度の高い鉄板である場合には、この鉄板に直接溝を形成すると溝底部分の板厚を極めて薄くする必要があるので、プレス加工やウエットエッチングによってこの板厚を正確に制御することが困難になる。このため、従来は、外装ケース１の鉄板に開口孔を形成しておき、ここに薄い（例えば５μｍ）ニッケル板等をレーザ溶接等で張り付けることにより安全弁を設けていたので、製造に手間がかかり低コスト化を阻害するという問題があった。
【０００６】
これに対して、外装ケース１をアルミニウム板にした場合には、このアルミニウム板に直接切り欠き弁の溝を形成しても、溝底部分の板厚をある程度厚くできるので、プレス加工やウエットエッチングによってこの板厚を所定許容範囲内に制御することは容易である。しかし、このアルミニウム板は、比較的粘りがあるため、内部からのガス圧を受けると伸びが生じ、作動圧が安定しないという問題があった。
【０００７】
本発明は、かかる事情に鑑みてなされたものであり、外装ケースにアルミニウムと銅等のクラッドメタルを用い、このクラッドメタルの金属界面に達するまでの深さの溝を設けて切り欠き弁を形成することにより、外装ケースを負極にしたまま電池重量の軽量化を図ると共に、動作の安定した安全装置を安価に設けることができる非水電解質二次電池を提供することを目的としている。
【０００８】
【課題を解決するための手段】
本発明は、上記課題を解決するために、発電要素を外装ケース内に収納すると共に、この発電要素の負極を内部で外装ケースに接続した非水電解質二次電池において、前記外装ケースを、外側にアルミニウム板を用い内側にアルミニウム以外の金属板を用いたクラッドメタルによって構成すると共に、この外装ケースの外面に、クラッドメタルの金属界面に達するまでの深さを有する溝を設けた切り欠き弁を形成したことを特徴とする。
【０００９】
【００１０】
本発明によれば、外装ケースの外側をアルミニウム板にするので、電池重量の軽量化を図ることができる。しかも、外装ケースの内側をアルミニウム以外の金属板にするので、リチウムと反応しないものを使用することが可能になり、この外装ケースに負極を接続して、従来からの鉄板を用いた場合の発電要素の製造ラインをそのまま利用することができるようになる。また、クラッドメタルは、その製造時の熱間圧延工程によって界面に硬い合金層が形成されるので、アルミニウム板側からこの界面に達するまでの溝を設けるだけで、容易に溝底部分の板厚の許容誤差が大きい切り欠き弁を形成することができる。このため、鉄板を用いた場合にように、ニッケル板等を張り付けた安全弁を設ける必要がなくなると共に、アルミニウム板を単独で用いた場合のように作動圧が不安定になるようなこともなくなる。
【００１１】
【発明の実施の形態】
以下、本発明の実施形態について図面を参照して説明する。
【００１２】
図１〜図２は本発明の一実施形態を示すものであって、図１は外装ケースと切り欠き弁の構成を示す縦断面図、図２は非水電解質二次電池の外観を示す斜視図である。なお、図３に示した従来例と同様の機能を有する構成部材には同じ番号を付記する。
【００１３】
本実施形態は、図２に示すように、箱型容器状の外装ケース１に発電要素２を収納し蓋３を取り付けて内部を密閉した角型の非水電解質二次電池について説明する。外装ケース１は、図１に示すように、外側にアルミニウム板１ａを用い内側に銅板１ｂを用いたクラッドメタルを箱型の容器状に加工したものである。アルミニウム板１ａは、アルミニウム又はアルミニウムを主体とするアルミニウム合金の板材であり、銅板１ｂは、銅又は銅を主体とする銅合金の板材である。なお、銅板１ｂは、延展性を高めるために、銅合金を使用することが好ましい。クラッドメタルは、２種以上の金属を熱間圧延工程によって圧延し張り合わせたものであり、ここではアルミニウム板１ａが０．３ｍｍで銅板１ｂが０．２ｍｍの厚さのクラッドメタルを用いる。このようなクラッドメタルは、熱間圧延工程によってアルミニウム板１ａと銅板１ｂの界面にこれらの金属よりも硬度の硬い合金層１ｃが薄い層状に形成される。また、この外装ケース１には、図２に示すように、面積の広い側面に切り欠き弁４が形成される。この切り欠き弁４は、図１に示すように、プレス加工によってアルミニウム板１ａの表面に円形に刻印されたくさび状の溝であり、溝の底が合金層１ｃよりもわずかに手前側になる程度の深さに形成される。なお、図１では、溝の深さや板厚を強調して示している。
【００１４】
発電要素２は、図３に示したものと同様に、正極と負極をセパレータを介して楕円形に巻回したものであり、外装ケース１の内部に多少圧入して挿入される。正極は、帯状のアルミニウム箔の表面にリチウムコバルト複合酸化物等の正極活物質を塗布したものであり、負極は、帯状の銅箔の表面にグラファイト等の負極活物質を塗布したものである。また、負極は、発電要素２の最外周に来るように巻回されると共に、この最外周部の外向き面には負極活物質を塗布しないようにしておく。従って、この負極の最外周部の外向き面は、銅箔が露出するので、外装ケース１に収納した際に、銅板１ｂの内面に直接接触し接続されるようになる。蓋３は、外装ケース１と同様のクラッドメタルからなる板状であり、この板状の中央部に表裏に貫通する正極端子３ａが絶縁して取り付けられている。この蓋３は、正極端子３ａに発電要素２の正極を接続してから、外装ケース１の開口部に嵌め込んでレーザ溶接により溶着することにより取り付けられる。また、外装ケース１の内部には、蓋３の取り付け前に非水電解液が注液される。
【００１５】
上記構成の非水電解質二次電池は、外装ケース１の大半が軽いアルミニウム板１ａによって構成されるので、電池重量を大幅に軽量化することができる。例えば、鉄板のみを用いた外装ケース１の場合には重量が１６ｇ（電池重量は４０ｇ）であったものが、本実施形態の場合には８ｇ（電池重量は３２ｇ）に軽減され、アルミニウム板のみを用いた場合の６ｇ（電池重量は３０ｇ）に比べても遜色のないものとなる。
【００１６】
また、外装ケース１は、内側が銅板１ｂによって構成されるので、アルミニウム板のみを用いた場合のように、負極と接続してもリチウムと反応することがなくなる。従って、外装ケース１に鉄板のみを用いた従来からの非水電解質二次電池の発電要素２の製造ラインをそのまま利用することができるようになる。なお、この銅板１ｂは、外装ケース１に負極を接続したことにより、アルミニウム板１ａがリチウムと反応するのを防止するためのものであるため、十分に薄くすることができ、これによって上記のように外装ケース１の大幅な軽量化を図ることができる。
【００１７】
さらに、この外装ケース１には、アルミニウム板１ａ側から合金層１ｃに達するまでの深さの溝を設けた切り欠き弁４が形成されるので、内部のガス圧が異常に上昇した場合に、アルミニウム板１ａの耐圧にほとんど依存することなく破断する。従って、アルミニウム板のみの外装ケース１に切り欠き弁４を形成した場合のように、作動圧が不安定になるおそれがなくなる。しかも、溝の底と合金層１ｃとの間に介在する薄いアルミニウム板１ａの層の耐圧が、硬い合金層１ｃの耐圧に比べて十分に小さければよいので、溝の深さにある程度の誤差が生じても、作動圧が大きく変動するようなこともなくなる。また、合金層１ｃはアルミニウム板１ａに比べて十分に硬いので、本実施形態のように溝をプレス加工によって刻印する場合には、プレス圧が多少増加しても溝の底が合金層１ｃに食い込むようなことがなくなり、この溝を合金層１ｃに達するまでの深さにとどめる制御が容易となる。さらに、本実施形態の場合には、外装ケース１の内側に軟らかくて薄い銅板１ｂを用いるので、切り欠き弁４の作動圧は、合金層１ｃの耐圧に大きく依存することになり、特に安定した作動圧を得ることができる。
【００１８】
なお、上記実施形態では、外装ケース１の内側に銅板１ｂを用いたが、リチウムと反応しない金属板であれば他のものでもよく、ニッケル板やステンレス板又は鉄板等を用いることが可能である。
【００１９】
また、上記実施形態では、切り欠き弁４の溝を外側のアルミニウム板１ａの表面からのみ形成したが、内側からも形成することができ、特にこの内側に銅板１ｂよりも硬い金属板を用いる場合には、内外の双方から形成することが好ましい。さらに、この切り欠き弁４の溝は、プレス加工による刻印ではなく、ウエットエッチによりハーフエッチングする等の他の方法により形成してもよい。しかも、この切り欠き弁４の溝は、円形に限らず、任意の形状に形成することができる。
【００２０】
さらに、上記実施形態では、楕円形に巻回した発電要素２を用いたが、この発電要素２の構成は任意である。また、上記実施形態では、外装ケース１を箱型の容器状とした角型の非水電解質二次電池について説明したが、本発明はこれに限らず、任意の形状の外装ケース１を用いることができる。
【００２１】
【発明の効果】
以上の説明から明らかなように、本発明の非水電解質二次電池によれば、外装ケースにアルミニウム板を用いることにより電池重量の軽量化を図ると共に、この外装ケースに負極を接続し、従来からの鉄板を用いた場合の発電要素の製造ラインをそのまま利用して安価に製造することができるようになる。また、界面に硬い合金層が形成されるクラッドメタルを用いるので、作動圧が安定した切り欠き弁を容易に形成することができるようになる。
【図面の簡単な説明】
【図１】 本発明の一実施形態を示すものであって、外装ケースと切り欠き弁の構成を示す縦断面図である。
【図２】 本発明の一実施形態を示すものであって、非水電解質二次電池の外観を示す斜視図である。
【図３】 従来例を示すものであって、非水電解質二次電池の構造を示す分解斜視図である。
【符号の説明】
１ 外装ケース
１ａ アルミニウム板
１ｂ 銅板
１ｃ 合金層
２ 発電要素
４ 切り欠き弁[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a non-aqueous electrolyte secondary battery provided with a safety device that opens a part of an outer case and vents gas when an internal gas pressure rises abnormally.
[0002]
[Prior art]
In the non-aqueous electrolyte secondary battery, as shown in FIG. 3, a corner in which a power generation element 2 in which a positive electrode and a negative electrode are wound in an oval shape through a separator is housed in an outer case 1 in which an iron plate is box-shaped. There is a type. In this non-aqueous electrolyte secondary battery, a negative electrode wound around the outermost periphery of the power generation element 2 is directly brought into contact with the inner surface of the outer case 1 so that the entire outer case 1 becomes a negative electrode terminal. Note that a lid (not shown) is attached to the exterior case 1 to seal the inside. Further, the positive electrode of the power generation element 2 is connected to a positive electrode terminal provided on the lid. However, since such a non-aqueous electrolyte secondary battery uses an iron plate for the outer case 1, there is a drawback in that the weight of the battery increases. Therefore, recently, it has been studied to reduce the weight of the exterior case 1 by using a light aluminum plate.
[0003]
In addition, since non-aqueous electrolyte secondary batteries use materials that are more reactive than aqueous electrolyte secondary batteries, it is particularly necessary to consider safety. For this reason, the exterior case 1 is provided with a safety device for releasing the gas by releasing the internal pressure when the internal gas pressure rises abnormally. Further, as such a safety device, if a groove is formed in a part of the plate surface of the outer case 1 and a notch valve is formed so that the groove is broken when the internal pressure rises to a predetermined level or more, press working or wet It becomes easy to process by etching and it is easy to reduce the cost.
[0004]
[Problems to be solved by the invention]
However, when the outer case 1 is made of an aluminum plate, it reacts with lithium if it is made a negative electrode, so it must be connected to the positive electrode of the power generating element 2 and the polarity of the power generating element 2 needs to be reversed. . For this reason, when using an aluminum plate for the outer case 1 to reduce the weight of the battery, the production line of the power generating element 2 when using an iron plate for the outer case 1 cannot be used as it is. The problem of requiring capital investment arises.
[0005]
If the notch valve is used, the manufacturing cost of the safety device is reduced. However, when the outer case 1 is a high-strength iron plate, if the groove is formed directly on the iron plate, the thickness of the groove bottom portion is extremely reduced. Since it is necessary to reduce the thickness, it is difficult to accurately control the plate thickness by pressing or wet etching. For this reason, conventionally, an opening hole is formed in the iron plate of the outer case 1 and a safety valve is provided by attaching a thin (for example, 5 μm) nickel plate or the like here by laser welding or the like. There was a problem of hindering cost reduction.
[0006]
On the other hand, when the outer case 1 is made of an aluminum plate, the thickness of the groove bottom portion can be increased to some extent even if the groove of the notch valve is directly formed on the aluminum plate. Therefore, it is easy to control the plate thickness within a predetermined allowable range. However, since this aluminum plate is relatively sticky, there is a problem that when the gas pressure is received from the inside, the aluminum plate is stretched and the operating pressure is not stable.
[0007]
The present invention has been made in view of such circumstances, and a notch valve is formed by using a cladding metal such as aluminum and copper for an outer case and providing a groove having a depth to reach the metal interface of the cladding metal. Accordingly, it is an object of the present invention to provide a non-aqueous electrolyte secondary battery in which the weight of the battery can be reduced while the outer case is made a negative electrode, and a safety device with stable operation can be provided at low cost.
[0008]
[Means for Solving the Problems]
In order to solve the above problems, the present invention provides a nonaqueous electrolyte secondary battery in which a power generation element is housed in an outer case and a negative electrode of the power generation element is connected to the outer case inside. A notch valve is formed of a clad metal using an aluminum plate on the inside and a metal plate other than aluminum inside, and a groove having a depth to reach the metal interface of the clad metal is provided on the outer surface of the outer case. It is formed .
[0009]
[0010]
According to the present invention, since the outer side of the exterior case is made of an aluminum plate, the weight of the battery can be reduced. Moreover, since the inside of the outer case is made of a metal plate other than aluminum, it is possible to use one that does not react with lithium, and power generation using a conventional iron plate by connecting a negative electrode to this outer case The element production line can be used as it is. In addition, since a hard alloy layer is formed at the interface of the clad metal by the hot rolling process at the time of manufacture, the thickness of the bottom portion of the groove can be easily obtained only by providing a groove from the aluminum plate side to the interface. A notch valve having a large tolerance can be formed. For this reason, it is not necessary to provide a safety valve to which a nickel plate or the like is attached as in the case of using an iron plate, and the operating pressure does not become unstable as in the case of using an aluminum plate alone.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0012]
1 and 2 show an embodiment of the present invention. FIG. 1 is a longitudinal sectional view showing a configuration of an exterior case and a notch valve, and FIG. 2 is a perspective view showing an external appearance of a nonaqueous electrolyte secondary battery. FIG. In addition, the same number is attached | subjected to the structural member which has the function similar to the prior art example shown in FIG.
[0013]
In the present embodiment, as shown in FIG. 2, a rectangular nonaqueous electrolyte secondary battery in which a power generation element 2 is housed in a box-shaped container-like outer case 1 and a lid 3 is attached and the inside is sealed will be described. As shown in FIG. 1, the outer case 1 is formed by processing a clad metal using an aluminum plate 1a on the outside and a copper plate 1b on the inside into a box-shaped container. The aluminum plate 1a is a plate material of aluminum or an aluminum alloy mainly composed of aluminum, and the copper plate 1b is a plate material of copper or a copper alloy mainly composed of copper. In addition, it is preferable to use a copper alloy for the copper plate 1b in order to improve ductility. The clad metal is obtained by rolling and bonding two or more kinds of metals by a hot rolling process. Here, a clad metal having a thickness of 0.3 mm for the aluminum plate 1a and 0.2 mm for the copper plate 1b is used. In such a clad metal, an alloy layer 1c harder than these metals is formed in a thin layer at the interface between the aluminum plate 1a and the copper plate 1b by a hot rolling process. Further, as shown in FIG. 2, the exterior case 1 is formed with a notch valve 4 on a side surface having a large area. As shown in FIG. 1, the notch valve 4 is a wedge-shaped groove that is stamped in a circle on the surface of the aluminum plate 1a by pressing, and the bottom of the groove is slightly in front of the alloy layer 1c. It is formed to a certain depth. In FIG. 1, the depth and thickness of the grooves are emphasized.
[0014]
As in the case shown in FIG. 3, the power generation element 2 is obtained by winding a positive electrode and a negative electrode in an elliptical shape with a separator interposed therebetween, and is inserted into the exterior case 1 by being slightly pressed. The positive electrode is obtained by applying a positive electrode active material such as lithium cobalt composite oxide on the surface of a strip-like aluminum foil, and the negative electrode is obtained by applying a negative electrode active material such as graphite on the surface of a strip-like copper foil. In addition, the negative electrode is wound so as to come to the outermost periphery of the power generation element 2 and the negative electrode active material is not applied to the outward surface of the outermost peripheral portion. Therefore, since the copper foil is exposed at the outermost surface of the negative electrode, the outer surface of the negative electrode comes into direct contact with and is connected to the inner surface of the copper plate 1b when stored in the outer case 1. The lid 3 has a plate shape made of the same clad metal as that of the outer case 1, and a positive electrode terminal 3 a penetrating front and back is attached to the center portion of the plate shape. The lid 3 is attached by connecting the positive electrode of the power generation element 2 to the positive electrode terminal 3a, and then fitting it into the opening of the outer case 1 and welding it by laser welding. In addition, a non-aqueous electrolyte is injected into the exterior case 1 before the lid 3 is attached.
[0015]
In the non-aqueous electrolyte secondary battery having the above-described configuration, most of the outer case 1 is composed of the light aluminum plate 1a, so that the battery weight can be significantly reduced. For example, in the case of the outer case 1 using only an iron plate, the weight is 16 g (battery weight is 40 g), but in this embodiment, the weight is reduced to 8 g (battery weight is 32 g), and only the aluminum plate is used. Compared to 6 g when using (the battery weight is 30 g), it is inferior.
[0016]
Further, since the outer case 1 is constituted by the copper plate 1b, it does not react with lithium even when connected to the negative electrode as in the case where only the aluminum plate is used. Therefore, the conventional production line for the power generation element 2 of the nonaqueous electrolyte secondary battery using only the iron plate for the outer case 1 can be used as it is. The copper plate 1b is for preventing the aluminum plate 1a from reacting with lithium by connecting the negative electrode to the exterior case 1, and thus can be made sufficiently thin. In addition, the exterior case 1 can be significantly reduced in weight.
[0017]
Furthermore, since the cutout valve 4 provided with a groove having a depth from the aluminum plate 1a side to the alloy layer 1c is formed in the exterior case 1, when the internal gas pressure rises abnormally, It fractures almost without depending on the pressure resistance of the aluminum plate 1a. Therefore, there is no possibility that the operating pressure becomes unstable as in the case where the notch valve 4 is formed in the outer case 1 made of only an aluminum plate. In addition, since the pressure resistance of the thin aluminum plate 1a interposed between the bottom of the groove and the alloy layer 1c only needs to be sufficiently smaller than the pressure resistance of the hard alloy layer 1c, there is some error in the groove depth. Even if it occurs, the operating pressure does not fluctuate greatly. In addition, since the alloy layer 1c is sufficiently harder than the aluminum plate 1a, when the groove is engraved by press working as in the present embodiment, the bottom of the groove is formed on the alloy layer 1c even if the press pressure is slightly increased. No biting occurs, and it becomes easy to control the groove to a depth until reaching the alloy layer 1c. Furthermore, in the case of the present embodiment, since the soft and thin copper plate 1b is used inside the outer case 1, the operating pressure of the notch valve 4 greatly depends on the pressure resistance of the alloy layer 1c and is particularly stable. An operating pressure can be obtained.
[0018]
In the above embodiment, the copper plate 1b is used on the inner side of the outer case 1. However, any other metal plate that does not react with lithium may be used, and a nickel plate, a stainless steel plate, an iron plate, or the like can be used. .
[0019]
Moreover, in the said embodiment, although the groove | channel of the notch valve 4 was formed only from the surface of the outer side aluminum plate 1a, it can also form from the inner side, especially when using a metal plate harder than the copper plate 1b in this inner side It is preferable to form both from inside and outside. Further, the groove of the notch valve 4 may be formed by other methods such as half etching by wet etching instead of stamping by pressing. Moreover, the groove of the notch valve 4 is not limited to a circular shape and can be formed in an arbitrary shape.
[0020]
Furthermore, in the said embodiment, although the electric power generation element 2 wound by the ellipse was used, the structure of this electric power generation element 2 is arbitrary. In the above embodiment, the rectangular nonaqueous electrolyte secondary battery in which the outer case 1 is a box-shaped container has been described. However, the present invention is not limited to this, and an outer case 1 having an arbitrary shape is used. Can do.
[0021]
【The invention's effect】
As is apparent from the above description, according to the nonaqueous electrolyte secondary battery of the present invention, the weight of the battery is reduced by using an aluminum plate for the outer case, and a negative electrode is connected to the outer case. It is possible to manufacture the power generating element at a low cost by directly using the power generating element manufacturing line in the case of using an iron plate from No. 1. In addition, since a clad metal having a hard alloy layer formed at the interface is used, a notch valve with a stable operating pressure can be easily formed.
[Brief description of the drawings]
FIG. 1, showing an embodiment of the present invention, is a longitudinal sectional view showing a configuration of an exterior case and a notch valve.
FIG. 2, showing an embodiment of the present invention, is a perspective view showing an external appearance of a nonaqueous electrolyte secondary battery.
FIG. 3 is an exploded perspective view showing a conventional example and showing the structure of a non-aqueous electrolyte secondary battery.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Exterior case 1a Aluminum plate 1b Copper plate 1c Alloy layer 2 Power generation element 4 Notch valve

Claims (1)

発電要素を外装ケース内に収納すると共に、この発電要素の負極を内部で外装ケースに接続した非水電解質二次電池において、前記外装ケースを、外側にアルミニウム板を用い内側にアルミニウム以外の金属板を用いたクラッドメタルによって構成すると共に、この外装ケースの外面に、クラッドメタルの金属界面に達するまでの深さを有する溝を設けた切り欠き弁を形成したことを特徴とする非水電解質二次電池。In the nonaqueous electrolyte secondary battery in which the power generation element is housed in the outer case and the negative electrode of the power generation element is connected to the outer case, the outer case is made of an aluminum plate on the outer side and a metal plate other than aluminum on the inner side. A non-aqueous electrolyte secondary characterized in that a notch valve is formed with a groove having a depth to reach the metal interface of the clad metal on the outer surface of the outer case. battery.
JP27538597A 1997-10-08 1997-10-08 Nonaqueous electrolyte secondary battery Expired - Fee Related JP3849733B2 (en)

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JP27538597A JP3849733B2 (en) 1997-10-08 1997-10-08 Nonaqueous electrolyte secondary battery

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Application Number Priority Date Filing Date Title
JP27538597A JP3849733B2 (en) 1997-10-08 1997-10-08 Nonaqueous electrolyte secondary battery

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JPH11111241A JPH11111241A (en) 1999-04-23
JP3849733B2 true JP3849733B2 (en) 2006-11-22

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Publication number Priority date Publication date Assignee Title
KR100573093B1 (en) * 1998-10-14 2006-08-30 삼성에스디아이 주식회사 Pouch Type Lithium Ion Secondary Battery
JP4827111B2 (en) * 2000-07-31 2011-11-30 日立マクセルエナジー株式会社 Flat non-aqueous electrolyte secondary battery
KR100551885B1 (en) 2003-10-20 2006-02-10 삼성에스디아이 주식회사 Lithium ion secondary battery
DE602006018077D1 (en) * 2006-06-23 2010-12-16 Boston Power Inc LITHIUM BATTERY WITH AN EXTERNAL LAYER WITH POSITIVE HEAT EXTRACTION COEFFICIENT
WO2008018241A1 (en) * 2006-08-10 2008-02-14 Panasonic Corporation Enclosed battery
JP5593508B2 (en) * 2007-09-21 2014-09-24 エリーパワー株式会社 Electrode terminal mounting structure and non-aqueous electrolyte secondary battery
DE102008059963B4 (en) * 2008-12-02 2014-11-27 Daimler Ag Single cell for a battery and method for its production
JP2013004402A (en) * 2011-06-20 2013-01-07 Toshiba Corp Secondary battery cell, secondary battery device, vehicle, electric device, and method for manufacturing secondary battery cell
CN106784419A (en) * 2016-12-21 2017-05-31 常熟高嘉能源科技有限公司 A kind of corrosion-resistant dynamic lithium battery aluminum hull and preparation method thereof
DE102017211112A1 (en) * 2017-06-30 2019-01-03 Robert Bosch Gmbh battery cell
CN115548570A (en) * 2020-05-12 2022-12-30 路华置富电子(深圳)有限公司 Explosion-proof packaging structure and corresponding battery

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