JP2003157809A - Rectangular lithium ion secondary battery - Google Patents
Rectangular lithium ion secondary batteryInfo
- Publication number
- JP2003157809A JP2003157809A JP2001358791A JP2001358791A JP2003157809A JP 2003157809 A JP2003157809 A JP 2003157809A JP 2001358791 A JP2001358791 A JP 2001358791A JP 2001358791 A JP2001358791 A JP 2001358791A JP 2003157809 A JP2003157809 A JP 2003157809A
- Authority
- JP
- Japan
- Prior art keywords
- plate thickness
- long side
- less
- secondary battery
- ion secondary
- 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
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、角型外装缶を使用
した角型リチウムイオン二次電池に関し、特に角型外装
缶が薄型であるものに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a prismatic lithium ion secondary battery using a prismatic outer can, and more particularly to a prismatic outer can having a thin shape.
【０００２】[0002]
【従来の技術】従来、リチウムイオン二次電池の外装缶
は、ニッケル水素蓄電池などと同様に鉄ケースがよく使
われていた。最近では、角型電池などで軽量化のためア
ルミケースが使われており、さらなる軽量化と高容量化
のために、アルミケースの板厚を薄くする検討が行なわ
れている。2. Description of the Related Art Conventionally, an iron case is often used for an outer case of a lithium ion secondary battery, as in a nickel hydrogen storage battery. Recently, aluminum cases have been used to reduce the weight of prismatic batteries and the like, and studies are underway to reduce the thickness of the aluminum cases in order to further reduce the weight and increase the capacity.
【０００３】また、その外装缶は通常、数回の絞り加工
工程としごき加工工程を経て製造される。特殊な工法と
しては、特公平７−９９６８６号公報に記載されている
ように、絞り加工としごき加工を併用したＤｒａｗｉｎ
ｇ ａｎｄ Ｉｒｏｎｉｎｇ（ＤＩ）工法や、特開平１
０−５９０６号公報に記載されているように衝撃押し出
し加工工程を数回の絞り加工工程としごき加工工程の中
に含ませる工法などがある。Further, the outer can is usually manufactured through several drawing processes and ironing processes. As a special construction method, as described in Japanese Examined Patent Publication No. 7-99686, Drawin using both drawing and ironing
g and Ironing (DI) method, and
As described in Japanese Patent Application Laid-Open No. 0-5906, there is a method in which the impact extrusion process is performed several times as a drawing process and included in the ironing process.
【０００４】リチウムイオン二次電池においては、サイ
クル使用時や高温保存時に、極板の膨潤やガス発生によ
り、外装缶に内部からの圧力がかかる。その際、外装缶
の強度が弱いと電池が大きく膨れて、電池特性が劣化し
たり、リチウムイオン二次電池を収めている電池パック
が壊れたりするため、外装缶にはある程度の強度が必要
であった。外装缶をアルミケースにしたり、箔肉化を進
めると当然強度が弱くなるため、従来からさまざまな構
成が提案されていた。In a lithium-ion secondary battery, pressure is applied from the inside to the outer can due to swelling of the electrode plate and generation of gas during cycle use or high temperature storage. At that time, if the strength of the outer can is weak, the battery will swell greatly, and the battery characteristics will deteriorate, or the battery pack containing the lithium-ion secondary battery will break, so the outer can requires some strength. there were. Since the strength will naturally weaken when the outer can is made into an aluminum case or the thickness of the foil is advanced, various structures have been proposed in the past.
【０００５】例えば、特許第３０９６６１５号公報に記
載されているようにアルミケースの材料にマンガン（Ｍ
ｎ）を含むアルミニウム合金を使う等、材質を検討する
ことが行なわれていた。また、特許第３１１４７６８号
公報や、特許３０１５６６７号公報に記載されているよ
うに、外装缶の形状を最適化することも検討されてい
た。For example, as described in Japanese Patent No. 3096615, manganese (M
Materials have been studied, such as using an aluminum alloy containing n). Also, as described in Japanese Patent No. 3114768 and Japanese Patent No. 3015667, optimization of the shape of the outer can has been studied.
【０００６】[0006]
【発明が解決しようとする課題】しかし、以上のような
構成では、外装缶の板厚が０．２ｍｍ以下になった場
合、外装缶の実用上必要な強度が取れないので、サイク
ル使用時や高温保存時に電池が膨れてしまうという課題
があった。本発明は、この課題を解決し、軽量薄肉化さ
れた外装缶を使用しつつ、サイクル使用時や高温保存時
の電池膨れの少ないリチウムイオン二次電池を提供する
ことを目的とする。However, with the above-mentioned structure, when the thickness of the outer can is 0.2 mm or less, the strength of the outer can that is practically required cannot be obtained. There is a problem that the battery swells when stored at high temperature. An object of the present invention is to solve this problem and to provide a lithium-ion secondary battery that uses a light-weight and thin-walled outer can and has less battery swelling during cycle use or high-temperature storage.
【０００７】[0007]
【課題を解決するための手段】上記の課題を解決するた
め、本発明の電池は、角型外装缶の長側面の板厚が、
０．１４ｍｍ以上０．１８ｍｍ以下であり、底側面に対
する長側面の絞り率（ただし、絞り率＝（底面板厚―側
面板厚）÷底面板厚 ）が、０．５以上あり、短側面の
板厚は、長側面の板厚より厚くて底面の板厚より薄いも
のであり、さらに、前記長側面、前記短側面および前記
底面の各中心断面での２μｍ以下の粒径の不純物粒子
が、単位面積（０．０１６３ｍｍ2）あたりそれぞれ１
６０個以上２８０個以下、５０個以上１２０個以下およ
び２０個以下であることを特徴とするものである。この
電池は、長側面の板厚が０．１８ｍｍ以下と薄いのにも
関わらず、剛性が向上しており、サイクル使用時や高温
保存時の電池膨れが少ない。In order to solve the above problems, in the battery of the present invention, the plate thickness of the long side surface of the rectangular outer can is
0.14 mm or more and 0.18 mm or less, and the drawing ratio of the long side surface to the bottom side surface (however, the drawing ratio = (bottom plate thickness-side plate thickness) / bottom plate thickness) is 0.5 or more, and The plate thickness is thicker than the plate thickness of the long side surface and thinner than the plate thickness of the bottom surface, and further, the impurity particles having a particle size of 2 μm or less in each central cross section of the long side surface, the short side surface and the bottom surface, 1 per unit area (0.0163 mm 2 )
The number is 60 or more and 280 or less, 50 or more and 120 or less, and 20 or less. Although this battery has a thin plate of 0.18 mm or less on the long side surface, it has improved rigidity and little battery swelling during cycle use or storage at high temperature.
【０００８】さらに、外装缶は、Ｍｎを０．５重量％以
上２．５重量％以下含有し、マグネシウム（Ｍｇ）を
０．２重量％以上１．３％以下含有するアルミニウム合
金からなることが特に好ましい。Further, the outer can is made of an aluminum alloy containing 0.5 wt% to 2.5 wt% of Mn and 0.2 wt% to 1.3% of magnesium (Mg). Particularly preferred.
【０００９】以上のような構成にすることで、外装缶を
薄肉化してもサイクル使用時や高温保存時の電池膨れの
少ないリチウムイオン二次電池を提供することができ
る。With the above-mentioned structure, it is possible to provide a lithium ion secondary battery which has less battery swelling during cycle use or high temperature storage even if the outer can is made thin.
【００１０】[0010]
【発明の実施の形態】本発明の請求項１に記載の発明
は、長側面、短側面および底面とからなる角型外装缶に
電極群と非水電解液を収納し、封口板にて封口してなる
角型リチウムイオン二次電池において、前記長側面の板
厚が、０．１４ｍｍ以上０．１８ｍｍ以下であり、前記
底側面に対する前記長側面の絞り率（ただし、絞り率＝
（底面板厚―側面板厚）÷底面板厚 ）が、０．５以上
あり、前記短側面の板厚は、前記長側面の板厚より厚く
て前記底面の板厚より薄いものであり、さらに、前記長
側面、前記短側面および前記底面の各中心断面での２μ
ｍ以下の粒径の不純物粒子が、単位面積（０．０１６３
ｍｍ2）あたりそれぞれ１６０個以上２８０個以下、５
０個以上１２０個以下および２０個以下であることを特
徴としたものである。BEST MODE FOR CARRYING OUT THE INVENTION The invention according to claim 1 of the present invention is such that an electrode group and a non-aqueous electrolytic solution are contained in a rectangular outer can having a long side surface, a short side surface and a bottom surface, and a sealing plate is used for sealing. In the prismatic lithium-ion secondary battery formed as described above, the plate thickness of the long side surface is 0.14 mm or more and 0.18 mm or less, and the drawing rate of the long side surface with respect to the bottom side surface (however, the drawing rate =
(Bottom plate thickness-side plate thickness) / bottom plate thickness) is 0.5 or more, the short side plate thickness is thicker than the long side plate thickness and thinner than the bottom plate thickness, Furthermore, 2 μ at each central cross section of the long side surface, the short side surface, and the bottom surface.
Impurity particles having a particle size of m or less have a unit area (0.0163).
per mm 2 ) 160 or more and 280 or less, 5 respectively
It is characterized by being 0 or more and 120 or less and 20 or less.
【００１１】本発明の電池においては、電池内空間の体
積に最も寄与し、外装缶における割合の大きな長側面の
板厚が、０．１８ｍｍ以下となっているため、電池内空
間の増大による電池の高容量化と外装缶構成金属量の減
少による軽量化が行なわれている。この作用効果は、板
厚が薄くなればなるほど増すが、０．１４ｍｍ未満にな
ると強度の低下により外装缶の形成自体が難しくなる。
底面の板厚は、外装缶全体の強度を上げるためにある程
度の厚さが必要であり、絞り率は０．５以上あることが
好ましい。同様に、短側面は、長側面を脇から支える役
割を持つため、長側面の板厚より厚くて底面の板厚より
薄いことが好ましい。In the battery of the present invention, the plate thickness of the long side, which contributes most to the volume of the battery internal space and has a large proportion in the outer can, is 0.18 mm or less. The weight is being reduced by increasing the capacity and reducing the amount of metal used in the outer can. This function and effect increase as the plate thickness decreases, but if it is less than 0.14 mm, the strength of the plate decreases and it becomes difficult to form the outer can.
The bottom plate needs to have a certain thickness to increase the strength of the entire outer can, and the drawing ratio is preferably 0.5 or more. Similarly, since the short side surface has a role of supporting the long side surface from the side, it is preferable that the short side surface is thicker than the long side surface and thinner than the bottom surface.
【００１２】さらに、外装缶の構成材の塑性加工強度が
強すぎると、硬度が強くなるが靭性がなくなり、圧力に
対する膨れは大きくなる。逆に、塑性加工強度が低すぎ
ると、靭性は強くなるが硬度がなくなり、やはり圧力に
対する膨れが大きくなる。本発明者は、この塑性加工強
度は、外装缶内に含まれる不純物粒子の粒径と粒子数に
強い相関があり、塑性加工を行なうと不純物の粒子は細
かく多くなっていくため、塑性加工強度が大きいほど、
小さな粒径の粒子が多くなることを見出した。さらに、
本発明者は鋭意検討の結果、長側面、短側面および底面
の各中心断面での２μｍ以下の粒径の不純物粒子が、単
位面積（０．０１６３ｍｍ2）あたりそれぞれ１６０個
以上２８０個以下、５０個以上１２０個以下および２０
個以下であることが、好ましいことを見出した。Further, if the plastic working strength of the constituent material of the outer can is too high, the hardness is increased but the toughness is lost, and the swelling against pressure is increased. On the other hand, if the plastic working strength is too low, the toughness is increased but the hardness is lost, and the swelling against pressure is also increased. The inventors of the present invention have found that this plastic working strength has a strong correlation with the particle diameter and the number of particles of the impurity particles contained in the outer can. Is larger,
It was found that the number of particles having a small particle size increases. further,
As a result of intensive studies, the present inventor has found that the number of impurity particles having a particle size of 2 μm or less in each central cross section of the long side surface, the short side surface and the bottom surface is 160 or more and 280 or less per unit area (0.0163 mm 2 ), 50 20 or more and 120 or less
It has been found that the number is preferably less than or equal to the number.
【００１３】以上のような構成にすることにより、従来
の実用上の限界であった長側面が０．２ｍｍの外装缶と
同程度の耐膨れ性を持つ薄型外装缶を提供できる。With the above-mentioned structure, it is possible to provide a thin outer can having the same swelling resistance as that of an outer can having a long side of 0.2 mm, which has been a practical limit.
【００１４】本発明の請求項２に記載の発明は、請求項
１記載のリチウムイオン二次電池において、前記外装缶
は、Ｍｎを０．５重量％以上２．５重量％以下含有し、
Ｍｇを０．２重量％以上１．３％以下含有するアルミニ
ウム合金からなるとしたものである。According to a second aspect of the present invention, in the lithium ion secondary battery according to the first aspect, the outer can contains 0.5 wt% or more and 2.5 wt% or less of Mn,
It is made of an aluminum alloy containing 0.2% by weight or more and 1.3% or less of Mg.
【００１５】アルミニウム合金は、それに含まれる不純
物により加工のしやすさや、塑性加工強度による硬度や
靭性の変化が変わる。そのため、ＭｎおよびＭｇを適当
量含むことにより、原料のアルミ板から深絞り加工によ
り請求項１に記載されている外装缶を製造することが容
易に出来るようになる。このＭｎおよびＭｇの適当量
は、本発明者の鋭意検討の結果、Ｍｎを０．５重量％以
上２．５重量％以下含有し、Ｍｇを０．２重量％以上
１．３％以下含有することが好ましいことを見出した。The aluminum alloy changes in easiness of processing and changes in hardness and toughness due to plastic working strength due to impurities contained therein. Therefore, by including Mn and Mg in appropriate amounts, the outer can according to claim 1 can be easily manufactured from the aluminum plate as a raw material by deep drawing. As a result of intensive studies by the present inventors, the appropriate amount of Mn and Mg is 0.5% by weight or more and 2.5% by weight or less and 0.2% by weight or more and 1.3% or less by weight of Mg. It has been found that is preferable.
【００１６】以上述べたきたように、本発明の角型外装
缶は主たる構成材料はＭｎを０．５重量％以上２．５重
量％以下含有し、Ｍｇを０．２重量％以上１．３％以下
含有するアルミニウム合金であることが好ましい。この
ようなアルミ系材料には、日本工業規格（ＪＩＳ Ｈ４
０００（１９８８）、ＪＩＳ Ｈ４１６０（１９９４）
等）に規定されているように、Ａ３００４、Ａ３００
５、Ａ３１０４及びＡ３１０５などの強度を強化したア
ルミニウム合金などがある。As described above, the rectangular outer can of the present invention is mainly composed of 0.5% by weight to 2.5% by weight of Mn and 0.2% by weight to 1.3% of Mg. It is preferable that the aluminum alloy contains not more than%. For such aluminum-based materials, Japanese Industrial Standards (JIS H4
000 (1988), JIS H4160 (1994)
Etc.) as specified in A3004, A300
5, aluminum alloys with enhanced strength such as A3104 and A3105.
【００１７】[0017]
【実施例】次に、実施例を用いて、本発明の具体例につ
いて説明する。EXAMPLES Next, specific examples of the present invention will be described using examples.
【００１８】図１は、本実施例において作成した外装缶
の斜視図である。FIG. 1 is a perspective view of an outer can made in this embodiment.
【００１９】図１において外装缶のサイズは幅３４ｍ
ｍ、高さ４９ｍｍおよび厚み６．３ｍｍであり、本実施
例において作成した外装缶はすべて外形がこのサイズの
ものを作成した。In FIG. 1, the size of the outer can is 34 m in width.
m, the height was 49 mm, and the thickness was 6.3 mm, and all the outer cans made in this example had outer shapes of this size.
【００２０】ここで、１は長側面であり、外装缶におけ
る割合がもっとも大きい。長側面１を短側面２と底面３
が支えることで、外装缶全体の強度を保っている。電池
を作成する際には、外装缶内に電極群と非水電解液を収
納した後、開口部４に封口板がレーザ溶接される。Here, 1 is the long side, and the ratio in the outer can is the largest. Long side 1 to short side 2 and bottom 3
By supporting the, the strength of the entire outer can is maintained. When producing a battery, after the electrode group and the non-aqueous electrolyte are stored in the outer can, the sealing plate is laser-welded to the opening 4.
【００２１】本実施例においては、以下に詳細に述べる
各種の方法で、（表１）にまとめた板厚と単位面積あた
りの２μｍ以下の粒子数をもつ外装缶を作成した。板厚
に関しては、外装缶の各面の中心部付近を平板として切
りだし、マイクロメータで測定した。In this example, an outer can having the plate thickness and the number of particles of 2 μm or less per unit area summarized in (Table 1) was prepared by various methods described in detail below. Regarding the plate thickness, a plate near the center of each surface of the outer can was cut out and measured with a micrometer.
【００２２】粒子数に関しては、まず、外装缶の各面の
中心部付近の断面を鏡面研磨し、走査型電子顕微鏡で観
察した。その電子像を、縦１０２μｍ、横１６０μｍの
範囲（０．０１６３ｍｍ）で画像データとしてコンピュ
ーターに取りこみ画像処理をすることで、この面積当た
りの２μｍ以下の粒子数を測定した。Regarding the number of particles, first, the cross section near the center of each surface of the outer can was mirror-polished and observed with a scanning electron microscope. The electronic image was taken into a computer as image data in a range of 102 μm in length and 160 μm in width (0.0163 mm), and image processing was performed to measure the number of particles of 2 μm or less per area.
【００２３】同じ方法及び同じ金型（パンチおよびダイ
ス）で作成した外装缶は、同じ板厚およびほぼ同じ粒子
数を持つことを確認した。
＜外装缶の作成＞
（缶の製造法１）従来公知の方法である深しぼり工法を
用い、現在、実用に供されている外装缶の中では一番の
薄型であり、長側面の板厚が０．２ｍｍの比較例の外装
缶（缶１）を作成した。図２に示すとおり、以下に述べ
る合計１０工程での深絞り工法を行なった。It was confirmed that the outer cans made by the same method and the same mold (punch and die) have the same plate thickness and almost the same number of particles. <Preparation of outer can> (Can manufacturing method 1) Using the conventionally well-known deep squeezing method, it is the thinnest of the outer cans currently in practical use and has a long side plate thickness. An outer can (Can 1) of Comparative Example having a thickness of 0.2 mm was prepared. As shown in FIG. 2, the deep drawing method was performed in a total of 10 steps described below.
【００２４】（ａ）まず、厚さ０．６ｍｍのＭｎを１．
０から１．５重量％含むアルミニウム合金（Ａ３００
３）の平板を円形に切り出した。(A) First, 1.
Aluminum alloy containing 0 to 1.5% by weight (A300
The flat plate of 3) was cut into a circle.
【００２５】（ｂ）長円形のパンチとダイスにより絞り
加工を行なった。この工程では、板厚は変化しない。(B) Drawing was performed with an oval punch and a die. In this process, the plate thickness does not change.
【００２６】（ｃ）工程（ｂ）で得られた中間成形体に
さらに絞り加工を行ない長円性を増す再絞り工程を行な
った。(C) The intermediate compact obtained in step (b) was subjected to a drawing process and a redrawing process for increasing the ellipticity.
【００２７】（ｄ）さらに絞り加工を行なうと同時に略
矩形状に形成した。矩形体の高さｈは、この工程で約１
５ｍｍになった。(D) Further drawing was performed, and at the same time, a substantially rectangular shape was formed. The height h of the rectangular body is about 1 in this process.
It became 5 mm.
【００２８】（ｅ）さらに絞り加工と板厚を薄くするし
ごき加工を同時に行なった。この工程では深絞りになっ
てきたので上部はみみ５となった。矩形体の高さｈは、
この工程で約２５ｍｍになった。長側面の板厚は約０．
３ｍｍぐらいになった。(E) Further, the drawing process and the ironing process for reducing the plate thickness were simultaneously performed. In this process, since deep drawing has been performed, the upper part has a depth of 5. The height h of the rectangle is
In this process, it became about 25 mm. The plate thickness on the long side is about 0.
It became about 3 mm.
【００２９】（ｆ）もう一度、絞り加工と板厚を薄くす
るしごき加工を同時に行なった。矩形体の高さｈは、こ
の工程で約３５ｍｍになった。長側面の板厚も約０．２
４ｍｍぐらいになった。(F) Again, the drawing process and the ironing process for thinning the plate thickness were simultaneously performed. The height h of the rectangular body was about 35 mm in this step. The thickness of the long side is also about 0.2
It became about 4 mm.
【００３０】（ｇ）以上の工程では、絞り加工を行なっ
てきたため、底面に丸みがあった。この工程では、底面
をダイスにより平らにする底つぶし工程を行なった。矩
形体の高さｈは、この工程で約４０ｍｍになった。(G) Since the drawing process has been performed in the above steps, the bottom surface is rounded. In this step, a bottom crushing step of flattening the bottom surface with a die was performed. The height h of the rectangular body was about 40 mm in this step.
【００３１】（ｈ）さらに底面のコーナー部の曲率
（Ｒ）を少なくし、矩形性を高めるために矩形状の凹部
を持つダイスを用いて角出し工程を行った。矩形体の高
さｈは、この工程で約４５ｍｍになった。長側面の板厚
も約０．２２ｍｍぐらいになる。(H) Further, in order to reduce the curvature (R) of the corner portion of the bottom surface and to enhance the rectangularity, the corner forming process was performed using a die having a rectangular concave portion. The height h of the rectangular body was about 45 mm in this step. The plate thickness on the long side is also about 0.22 mm.
【００３２】（ｉ）矩形体の高さが約４３ｍｍのところ
でみみ５を切り離す仮トリミング工程を行なった。(I) A tentative trimming process for cutting off the dent 5 was performed at a height of the rectangular body of about 43 mm.
【００３３】（ｊ）最後に、絞り加工で最終成形を行な
った。矩形高さｈは約５３ｍｍになっているので、クロ
スカットで所定の高さ（４９ｍｍ）にした。(J) Finally, final forming was performed by drawing. Since the height h of the rectangle is about 53 mm, a predetermined height (49 mm) was obtained by cross cutting.
【００３４】板厚は、前述の測定方法で測定して、長側
面が０．２０ｍｍ、短側面が０．３０ｍｍおよび底面が
０．４０ｍｍであり、したがって絞り率は０．５０であ
った。２μｍ以下の粒子数は、長側面が４６、短側面が
９９および底面が３１であった。
（缶の製造法２）缶１と同じ材質（Ａ３００３）および
板厚（０．６ｍｍ）の平板を用い、缶１と同じ合計１０
工程の深絞り工法により、金型の短側面のクリアランス
を調節して、缶１より短側面の板厚が厚く、底形成工程
（ｇおよびｈ）のパンチ圧も調整して底面の板厚も厚い
比較例の外装缶（缶２）を作成した。The plate thickness was 0.20 mm on the long side surface, 0.30 mm on the short side surface and 0.40 mm on the bottom surface as measured by the above-described measuring method, and thus the drawing ratio was 0.50. The number of particles of 2 μm or less was 46 on the long side surface, 99 on the short side surface and 31 on the bottom surface. (Can manufacturing method 2) A flat plate having the same material (A3003) and plate thickness (0.6 mm) as the can 1 is used, and the same total as the can 1 10
By the deep drawing method of the process, the clearance of the short side surface of the mold is adjusted, the plate thickness of the short side surface is thicker than that of the can 1, and the punch pressure of the bottom forming process (g and h) is also adjusted to adjust the plate thickness of the bottom surface. A thick exterior canister (can 2) was prepared.
【００３５】板厚は、長側面が０．２０ｍｍ、短側面が
０．３５ｍｍおよび底面が０．４３ｍｍであり、したが
って絞り率は０．５３であった。２μｍ以下の粒子数
は、長側面が４２、短側面が８１および底面が２７であ
った。The plate thickness was such that the long side surface was 0.20 mm, the short side surface was 0.35 mm and the bottom surface was 0.43 mm, and thus the drawing ratio was 0.53. The number of particles of 2 μm or less was 42 on the long side surface, 81 on the short side surface, and 27 on the bottom surface.
【００３６】（缶の製造法３）缶１と同じ材質（Ａ３０
０３）および板厚（０．６ｍｍ）の平板を用い、缶１と
同じ合計１０工程の深絞り工法により、金型の短側面の
クリアランスを調節して、缶１より長側面の板厚が薄
く、そのかわり、底形成工程（ｇおよびｈ）のパンチ圧
も調整して底面の板厚が厚い比較例の外装缶（缶３）を
作成した。(Manufacturing method 3 of can) Same material as can 1 (A30
03) and a plate having a plate thickness (0.6 mm) are used to adjust the clearance on the short side of the mold by the deep drawing method of the same 10 steps as the can 1, so that the plate on the long side is thinner than the can 1. Instead, the punch pressure in the bottom forming steps (g and h) was also adjusted to prepare an outer can (can 3) of a comparative example having a thick bottom plate.
【００３７】板厚は、長側面が０．１８ｍｍ、短側面が
０．３０ｍｍおよび底面が０．５０ｍｍであり、したが
って絞り率は０．６４であった。２μｍ以下の粒子数
は、長側面が１４０、短側面が１０４および底面が２２
であった。The plate thickness was such that the long side surface was 0.18 mm, the short side surface was 0.30 mm, and the bottom surface was 0.50 mm. Therefore, the drawing ratio was 0.64. The number of particles of 2 μm or less is 140 on the long side, 104 on the short side and 22 on the bottom.
Met.
【００３８】（缶の製造法４）缶１と同じ深絞り工法で
あるが、工程を１１回に多段化して、本発明の実施例と
なる長側面の板厚が０．１８ｍｍの外装缶（缶４）を作
成した。(Manufacturing Method 4 of Cans) The same deep drawing method as can 1 is used, but the number of steps is increased to 11 times to form an outer can having a long side plate thickness of 0.18 mm, which is an embodiment of the present invention ( Can 4) was created.
【００３９】缶１と同じ材質（Ａ３００３）および板厚
（０．６ｍｍ）の平板を用い、最初の５工程（ａからｅ
まで）は、缶１とまったく同じ工程で行なった。Using the flat plate of the same material (A3003) and plate thickness (0.6 mm) as the can 1, the first 5 steps (a to e)
Up to) was performed in exactly the same process as in can 1.
【００４０】（ｆ）金型のクリアランスを調節して、缶
１よりやや強く絞った。長側面の板厚も約０．２２ｍｍ
ぐらいになった。(F) The clearance of the mold was adjusted to squeeze the can 1 slightly more strongly. The thickness of the long side is also about 0.22 mm
It's about now.
【００４１】（ｇ）缶１と同様に底つぶし工程を行なっ
た。(G) The bottom crushing step was performed in the same manner as the can 1.
【００４２】（ｈ）缶１と同様に角出し工程を行なっ
た。長側面の板厚も約０．２０ｍｍぐらいになった。(H) The squeezing process was performed in the same manner as in the can 1. The plate thickness on the long side also became about 0.20 mm.
【００４３】（ｈ’）仮トリミング工程（ｉ）を行なう
前に、絞り加工を行なった。長側面の板厚も約０．１９
ｍｍぐらいになった。(H ') Before performing the temporary trimming step (i), drawing processing was performed. The thickness of the long side is also about 0.19
It became about mm.
【００４４】これ以後の、後工程は（ｉおよびｊ）は、
缶１と同様に行った。The subsequent steps (i and j) are as follows.
It carried out like the can 1.
【００４５】板厚は、長側面が０．１８ｍｍ、短側面が
０．３０ｍｍおよび底面が０．５０ｍｍであり、したが
って絞り率は０．６４であった。２μｍ以下の粒子数
は、長側面が１６１、短側面が１０８および底面が１９
であった。The plate thickness was such that the long side surface was 0.18 mm, the short side surface was 0.30 mm and the bottom surface was 0.50 mm, and thus the drawing ratio was 0.64. The number of particles of 2 μm or less is 161, the long side, 108 the short side and 19 the bottom.
Met.
【００４６】（缶の製造法５）厚さ０．６ｍｍのＭｇを
０．２０から０．６重量％、Ｍｎを１．０から１．５重
量％含むアルミニウム合金（Ａ３００５）の平板に対
し、缶４と同じ合計１１工程の深絞り工法により、缶４
と同じ金型を用いて缶４と同じ外形を持つ実施例の外装
缶（缶２）を作成した。(Manufacturing Method 5 of Can) For a flat plate of an aluminum alloy (A3005) having a thickness of 0.6 mm and containing 0.20 to 0.6% by weight of Mg and 1.0 to 1.5% by weight of Mn, Can 4 by the same deep drawing method of 11 processes as can 4.
An outer can (can 2) of the example having the same outer shape as that of the can 4 was prepared using the same mold.
【００４７】したがって板厚は、缶４と同じ長側面が
０．１８ｍｍ、短側面が０．３０ｍｍおよび底面が０．
５０ｍｍであり、絞り率は０．６４であった。２μｍ以
下の粒子数は、材質が違うため、長側面が１７５、短側
面が１０９および底面が１９であった。Therefore, as for the plate thickness, the same long side surface as the can 4 is 0.18 mm, the short side surface is 0.30 mm, and the bottom surface is 0.
It was 50 mm and the drawing rate was 0.64. The number of particles of 2 μm or less was 175 on the long side surface, 109 on the short side surface, and 19 on the bottom surface because the materials were different.
【００４８】（缶の製造法６）缶１および缶４と同じ深
絞り工法であるが、工程を１２回とさらに多段化して、
本発明の実施例となる長側面の板厚が０．１５ｍｍの外
装缶（缶６）を作成した。(Manufacturing method 6 of cans) The same deep drawing method as cans 1 and 4 was used, but the number of steps was further increased to 12 and
An outer can (can 6) having a long side plate thickness of 0.15 mm was prepared as an example of the present invention.
【００４９】まず、缶５と同じ材質（Ａ３００５）およ
び板厚（０．６ｍｍ）の平板を用い、最初の５工程（ａ
からｅまで）は、缶１とまったく同じ工程で行なった。First, using a flat plate of the same material (A3005) and plate thickness (0.6 mm) as the can 5, the first five steps (a)
(E to e) were performed in exactly the same process as in can 1.
【００５０】（ｆ）金型のクリアランスを調節して、缶
１や缶４よりやや強く絞った。長側面の板厚も約０．２
０ｍｍぐらいになった。(F) The clearance of the mold was adjusted so that it was squeezed slightly more strongly than cans 1 and 4. The thickness of the long side is also about 0.2
It became about 0 mm.
【００５１】（ｆ’）底つぶし工程（ｇ）を行なう前
に、さらに絞り加工を行なった。長側面の板厚も約０．
１８ｍｍぐらいになった。(F ') Before the bottom crushing step (g), further drawing was performed. The plate thickness on the long side is about 0.
It became about 18 mm.
【００５２】（ｇ）缶１と同様に底つぶし工程を行なっ
た。(G) The bottom crushing step was performed in the same manner as the can 1.
【００５３】（ｈ）缶１と同様に角出し工程を行なっ
た。長側面の板厚も約０．１７ｍｍぐらいになった。(H) The squeezing process was performed in the same manner as in the can 1. The plate thickness on the long side also became about 0.17 mm.
【００５４】（ｈ’）缶４と同様に仮トリミング工程
（ｉ）を行なう前に、絞り加工を行なった。長側面の板
厚も約０．１６ｍｍぐらいになった。(H ') As in the case of the can 4, the drawing process was performed before the temporary trimming step (i). The plate thickness on the long side also became about 0.16 mm.
【００５５】これ以後の、後工程は（ｉおよびｊ）は、
缶１と同様に行った。In the subsequent steps (i and j),
It carried out like the can 1.
【００５６】板厚は、長側面が０．１５ｍｍ、短側面が
０．２８ｍｍおよび底面が０．４０ｍｍであり、したが
って絞り率は０．６３であった。２μｍ以下の粒子数
は、長側面が２０１、短側面が８０および底面が８であ
った。The plate thickness was such that the long side surface was 0.15 mm, the short side surface was 0.28 mm and the bottom surface was 0.40 mm, and thus the drawing ratio was 0.63. The number of particles of 2 μm or less was 201 on the long side surface, 80 on the short side surface, and 8 on the bottom surface.
【００５７】（缶の製造法７）厚さ０．６ｍｍのＭｇを
０．８から１．３重量％、Ｍｎを１．０から１．５重量
％含むアルミニウム合金（Ａ３００４）の平板に対し、
缶６と同じ合計１２工程の深絞り工法により、缶６と同
じ金型を用いて缶６と同じ外形を持つ実施例の外装缶
（缶７）を作成した。(Manufacturing method 7 of can) For a flat plate of an aluminum alloy (A3004) having a thickness of 0.6 mm and containing 0.8 to 1.3% by weight of Mg and 1.0 to 1.5% by weight of Mn,
An outer can (can 7) of the example having the same outer shape as that of the can 6 was formed by using the same die as that of the can 6 by the same deep drawing method of 12 steps as the can 6.
【００５８】したがって板厚は、缶６と同じ長側面が
０．１５ｍｍ、短側面が０．２８ｍｍおよび底面が０．
４０ｍｍであり、絞り率は０．６３であった。２μｍ以
下の粒子数は、材質が違うため、長側面が２７６、短側
面が１１４および底面が１４であった。Therefore, as for the plate thickness, the same long side as the can 6 is 0.15 mm, the short side is 0.28 mm, and the bottom is 0.
It was 40 mm and the drawing rate was 0.63. The number of particles of 2 μm or less was 276 on the long side surface, 114 on the short side surface, and 14 on the bottom surface because the materials were different.
【００５９】（缶の製造法８）缶６と同じ材質（Ａ３０
０５）および板厚（０．６ｍｍ）の平板を用い、缶６と
同じ合計１２工程の深絞り工法により、金型の長側面の
クリアランスを調節して、缶１より長側面の板厚が薄い
実施例の外装缶（缶８）を作成した。(Can manufacturing method 8) The same material as the can 6 (A30
05) and a plate having a plate thickness (0.6 mm), the clearance of the long side of the mold is adjusted by the same deep drawing method of 12 steps as the can 6, so that the plate on the long side is thinner than the can 1. The exterior canister (can 8) of the example was created.
【００６０】板厚は、長側面が０．１４ｍｍ、短側面が
０．２８ｍｍおよび底面が０．４０ｍｍであり、したが
って絞り率は０．６５であった。２μｍ以下の粒子数
は、長側面が２２８、短側面が８３および底面が９であ
った。The plate thickness was such that the long side surface was 0.14 mm, the short side surface was 0.28 mm, and the bottom surface was 0.40 mm. Therefore, the drawing ratio was 0.65. The number of particles of 2 μm or less was 228 on the long side surface, 83 on the short side surface, and 9 on the bottom surface.
【００６１】（缶の製造法９）缶６と同じ材質（Ａ３０
０５）および板厚（０．６ｍｍ）の平板を用い、衝撃押
し出し加工ととＤＩ工法を併用して比較例の外装缶（缶
１０）を作成した。(Manufacturing method 9 of can) The same material as the can 6 (A30
05) and a flat plate having a plate thickness (0.6 mm) were combined with the impact extrusion process and the DI method to prepare an outer can (can 10) of a comparative example.
【００６２】まず、Ａ３００５のペレットを用いて衝撃
押し出し加工を行なった。この中間成形体に一つのパン
チで三つのダイスを連続的に通すＤＩ加工を行ないほぼ
最終の形状である角型にした後、缶１と同様に底面のコ
ーナー部の曲率（Ｒ）を少なくし、矩形性を高めるため
に矩形状の凹部を持つダイスを用いて、底形成工程を行
なった。First, impact extrusion processing was performed using the A3005 pellets. After performing DI processing in which three dies are continuously passed through this intermediate compact by one punch to form a square shape which is almost the final shape, the curvature (R) of the corner portion of the bottom surface is reduced like the can 1. The bottom forming step was performed using a die having a rectangular recess to improve rectangularity.
【００６３】板厚は、長側面が０．１５ｍｍ、短側面が
０．２８ｍｍおよび底面が０．３５ｍｍであり、したが
って絞り率は０．５７であった。２μｍ以下の粒子数
は、長側面が７５、短側面が１９１および底面が１９０
であった。
＜外装缶の評価＞以上述べた缶の製造法１から９で製造
した缶１から９を外装缶が空の状態で開口部４を、封口
板の代わりとして厚さ０．６ｍｍの外装缶と同じ材質の
アルミニウム合金の平板でレーザ溶接封口した。そし
て、底面３に穴をあけて金属管を溶接し、その金属管か
ら圧縮空気を送り込み、その膨れをレーザ変位測定器で
測定した。缶内の圧縮空気が、０．１および０．５ｋｇ
ｆ／ｃｍ2の時の片側膨れ量を（表１）にまとめて示
す。The plate thickness was such that the long side surface was 0.15 mm, the short side surface was 0.28 mm and the bottom surface was 0.35 mm, and thus the drawing ratio was 0.57. The number of particles of 2 μm or less is 75 on the long side, 191 on the short side, and 190 on the bottom.
Met. <Evaluation of the outer can> The cans 1 to 9 manufactured by the above can manufacturing methods 1 to 9 were used as the outer can with an opening 4 and an outer can having a thickness of 0.6 mm instead of the sealing plate. Laser welding was performed using a flat plate of aluminum alloy of the same material. Then, a hole was made in the bottom surface 3 to weld a metal pipe, compressed air was sent from the metal pipe, and the swelling thereof was measured by a laser displacement measuring device. Compressed air in the can is 0.1 and 0.5 kg
The blisters on one side at f / cm 2 are summarized in (Table 1).
【００６４】[0064]
【表１】 [Table 1]
【００６５】（表１）からわかるとおり、従来の比較例
の缶１および２では、長側面の板厚が０．２ｍｍあるた
め、片側膨れ量が、出荷時の基準である０．１ｋｇｆ／
ｃｍ 2で０．１から０．２ｍｍの範囲にあり、サイクル
使用時の基準である０．５ｋｇｆ／ｃｍ2で０．５から
０．６ｍｍの範囲にあり、実用上問題のない強度があ
る。しかし、長側面の厚さが０．１８ｍｍである缶３に
なると、底面の板厚を厚くしても、つまり絞り率を高く
しても、底面の厚さは缶自体の強度にほとんど影響を与
えないので、膨れ量は大きくなってしまう。As can be seen from Table 1, the conventional comparative example
In Cans 1 and 2, the plate thickness on the long side was 0.2 mm.
Therefore, the bulge amount on one side is 0.1 kgf /
cm 2In the range of 0.1 to 0.2 mm, cycle
0.5kgf / cm, which is the standard when used2From 0.5
Within the range of 0.6 mm, the strength has no practical problem.
It However, for the can 3 whose long side has a thickness of 0.18 mm,
Then, even if the bottom plate thickness is increased, that is, the drawing rate is increased.
However, the thickness of the bottom surface has almost no effect on the strength of the can itself.
Because it is not possible, the amount of swelling will increase.
【００６６】本発明の実施例の缶４と比較例の缶３を比
べてみると、材質および外装缶の寸法が全く同じでも、
２μｍ以下の不純物粒子数が好適な範囲にあるため、強
度つまり膨れ量が０．１ｋｇｆ／ｃｍ2で１０％、０．
５ｋｇｆ／ｃｍ2で４０％向上している。Comparing the can 4 of the embodiment of the present invention with the can 3 of the comparative example, even if the material and the outer can have the same dimensions,
Since the number of impurity particles of 2 μm or less is in a suitable range, the strength, that is, the swollen amount is 10% at 0.1 kgf / cm 2 , and 0.1%.
There is an improvement of 40% at 5 kgf / cm 2 .
【００６７】また、外装缶の寸法が同じで材質のみが違
う缶４と缶５を比べてみると、２μｍ以下の不純物粒子
数も同程度であるが、材質は、マンガンを０．５重量％
以上２．５重量％以下含有し、マグネシウムを０．２重
量％以上１．３％以下含有するアルミニウム合金からな
ることが好ましいことがわかる。Further, comparing cans 4 and 5 having the same outer can size but different materials, the number of impurity particles of 2 μm or less is about the same, but the material is 0.5% by weight of manganese.
It can be seen that it is preferable to be made of an aluminum alloy containing not less than 2.5% by weight and not less than 0.2% by weight and not more than 1.3% by weight of magnesium.
【００６８】缶６、缶７および缶８から本発明の外装缶
では、長側面の板厚が０．１４ｍｍでも充分な強度があ
り、０．１５ｍｍでは優れた強度を持つことがわかる。
長側面の板厚が０．２ｍｍから０．１５ｍｍになると、
例えば本実施例の外装缶のサイズの幅３４ｍｍ、高さ４
９ｍｍおよび厚み６．３ｍｍで、電池内容積が約７％外
装缶重量で約１７％向上する。It can be seen from Cans 6, 7, and 8 that the outer can of the present invention has sufficient strength even when the long side plate thickness is 0.14 mm, and has excellent strength when it is 0.15 mm.
When the plate thickness on the long side changes from 0.2 mm to 0.15 mm,
For example, the size of the outer can of this embodiment is 34 mm in width and 4 in height.
At 9 mm and a thickness of 6.3 mm, the internal volume of the battery is improved by about 7% and the weight of the outer can is increased by about 17%.
【００６９】加工度を大きくすると、比較例の缶９のよ
うに２μｍ以下の不純物粒子数は、かなり大きくなる
が、このように硬度が大きすぎると、膨れ量、特に初期
の０．１ｋｇｆ／ｃｍ2の膨れ量が大きくなり不適であ
る。したがって、２μｍ以下の不純物粒子数には、最適
な範囲があり、２μｍ以下の粒径の不純物粒子が、単位
面積（０．０１６３ｍｍ2）あたりそれぞれ１６０個以
上２８０個以下、５０個以上１２０個以下および２０個
以下であることが好ましいことがわかる。When the degree of processing is increased, the number of impurity particles of 2 μm or less as in the can 9 of the comparative example is considerably increased. However, when the hardness is too high, the amount of swelling, especially 0.1 kgf / cm in the initial stage, is increased. 2 is unsuitable because the amount of swelling becomes large. Therefore, there is an optimum range for the number of impurity particles of 2 μm or less, and the number of impurity particles of 2 μm or less is 160 or more and 280 or less, or 50 or more and 120 or less per unit area (0.0163 mm 2 ), respectively. And it is preferable that the number is 20 or less.
【００７０】[0070]
【発明の効果】以上述べたとおり、本発明の角型リチウ
ムイオン二次電池を使用すれば、サイクル使用時や高温
保存時の電池膨れなどに強く相関する外装缶の強度は、
従来の角型リチウム二次電池と同等に保ちつつ、外装缶
が薄型であるため、電池内容積が大きく取れるため高容
量化と軽量化が期待できる。As described above, when the prismatic lithium ion secondary battery of the present invention is used, the strength of the outer can, which strongly correlates with battery swelling during cycle use or during high temperature storage,
While keeping the same size as the conventional rectangular lithium secondary battery, the outer can has a thin shape, so that a large internal volume of the battery can be obtained, so that high capacity and light weight can be expected.
【図１】本実施例において作成した外装缶の斜視図FIG. 1 is a perspective view of an exterior can made in this example.
【図２】本実施例において作成した外装缶の製造方法を
示す説明図FIG. 2 is an explanatory view showing a method for manufacturing an outer can made in this example.
１ 長側面 ２ 短側面 ３ 底面 ４ 開口部 ５ みみ ｈ 矩形部高さ 1 long side 2 short side 3 bottom 4 openings 5 Mimi h Height of rectangular part
Claims (2)
型外装缶に電極群と非水電解液を収納し、封口版にて封
口してなる角型リチウムイオン二次電池において、前記
長側面の板厚が、０．１４ｍｍ以上０．１８ｍｍ以下で
あり、前記底側面に対する前記長側面の絞り率（ただ
し、絞り率＝（底面板厚―側面板厚）÷底面板厚 ）
が、０．５以上あり、前記短側面の板厚は、前記長側面
の板厚より厚くて前記底面の板厚より薄いものであり、
さらに、前記長側面、前記短側面および前記底面の各中
心断面での２μｍ以下の粒径の不純物粒子が、単位面積
（０．０１６３ｍｍ2）あたりそれぞれ１６０個以上２
８０個以下、５０個以上１２０個以下および２０個以下
であることを特徴とする角型リチウムイオン二次電池。1. A prismatic lithium-ion secondary battery in which an electrode group and a non-aqueous electrolyte are housed in a prismatic outer can having a long side surface, a short side surface and a bottom surface and which is sealed with a sealing plate. The plate thickness of the side surface is 0.14 mm or more and 0.18 mm or less, and the drawing ratio of the long side surface with respect to the bottom side surface (where, drawing ratio = (bottom plate thickness−side plate thickness) ÷ bottom plate thickness)
Is 0.5 or more, and the plate thickness of the short side surface is larger than the plate thickness of the long side surface and smaller than the plate thickness of the bottom surface,
Further, the number of impurity particles having a particle size of 2 μm or less in each central cross section of the long side surface, the short side surface and the bottom surface is 160 or more per unit area (0.0163 mm 2 ).
A prismatic lithium-ion secondary battery comprising 80 or less, 50 or more and 120 or less, and 20 or less.
以上２．５重量％以下含有し、マグネシウムを０．２重
量％以上１．３％以下含有するアルミニウム合金からな
る請求項１記載の角型リチウムイオン二次電池。2. The outer can has 0.5% by weight of manganese.
The prismatic lithium-ion secondary battery according to claim 1, which is made of an aluminum alloy containing not less than 2.5% by weight and not less than 0.2% by weight and not more than 1.3% by weight of magnesium.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001358791A JP3702840B2 (en) | 2001-11-26 | 2001-11-26 | Square lithium ion secondary battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001358791A JP3702840B2 (en) | 2001-11-26 | 2001-11-26 | Square lithium ion secondary battery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2003157809A true JP2003157809A (en) | 2003-05-30 |
| JP3702840B2 JP3702840B2 (en) | 2005-10-05 |
Family
ID=19169910
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001358791A Expired - Fee Related JP3702840B2 (en) | 2001-11-26 | 2001-11-26 | Square lithium ion secondary battery |
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| Country | Link |
|---|---|
| JP (1) | JP3702840B2 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006059804A (en) * | 2004-07-23 | 2006-03-02 | Sony Corp | Cell battery pack |
| JP2014077189A (en) * | 2012-10-12 | 2014-05-01 | Nippon Light Metal Co Ltd | Aluminum alloy sheet for battery case excellent in moldability, heat release property and weldability |
| JP2019075334A (en) * | 2017-10-18 | 2019-05-16 | 昭和電工株式会社 | Manufacturing method of battery case body |
| US20190252647A1 (en) * | 2016-11-04 | 2019-08-15 | Schuler Pressen Gmbh | Method and device for producing a prismatic battery cell container |
| US20210104795A1 (en) * | 2018-12-29 | 2021-04-08 | Contemporary Amperex Technology Co., Limited | Secondary battery and battery unit |
| WO2024060194A1 (en) * | 2022-09-23 | 2024-03-28 | 宁德时代新能源科技股份有限公司 | Battery and electrical apparatus |
-
2001
- 2001-11-26 JP JP2001358791A patent/JP3702840B2/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006059804A (en) * | 2004-07-23 | 2006-03-02 | Sony Corp | Cell battery pack |
| JP2014077189A (en) * | 2012-10-12 | 2014-05-01 | Nippon Light Metal Co Ltd | Aluminum alloy sheet for battery case excellent in moldability, heat release property and weldability |
| US20190252647A1 (en) * | 2016-11-04 | 2019-08-15 | Schuler Pressen Gmbh | Method and device for producing a prismatic battery cell container |
| US11908989B2 (en) * | 2016-11-04 | 2024-02-20 | Schuler Pressen Gmbh | Method and device for producing a prismatic battery cell container |
| JP2019075334A (en) * | 2017-10-18 | 2019-05-16 | 昭和電工株式会社 | Manufacturing method of battery case body |
| US20210104795A1 (en) * | 2018-12-29 | 2021-04-08 | Contemporary Amperex Technology Co., Limited | Secondary battery and battery unit |
| WO2024060194A1 (en) * | 2022-09-23 | 2024-03-28 | 宁德时代新能源科技股份有限公司 | Battery and electrical apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3702840B2 (en) | 2005-10-05 |
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