JP4888177B2 - Method for manufacturing rectangular cross-section battery container using aluminum alloy plate - Google Patents

Method for manufacturing rectangular cross-section battery container using aluminum alloy plate Download PDF

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JP4888177B2
JP4888177B2 JP2007070866A JP2007070866A JP4888177B2 JP 4888177 B2 JP4888177 B2 JP 4888177B2 JP 2007070866 A JP2007070866 A JP 2007070866A JP 2007070866 A JP2007070866 A JP 2007070866A JP 4888177 B2 JP4888177 B2 JP 4888177B2
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container
aluminum alloy
rectangular cross
battery
rolling
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照栄 高橋
和好 鈴木
丕植 趙
秀彦 石井
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Nippon Light Metal Co Ltd
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries

Description

本発明は、アルミニウム合金の冷延板を素材としてコンピュータや電話等の電子機器類に組み込まれる電池の容器(ケース)を製造方法に関する。   The present invention relates to a method for manufacturing a battery container (case) incorporated in electronic devices such as a computer and a telephone using a cold-rolled sheet made of an aluminum alloy as a raw material.

一般に、電子機器等は駆動源として電池が内蔵されており、電池の容器にアルミニウム合金が使用されている。例えば、携帯電話用のリチウムイオン2次電池の容器は断面が矩形で、厚さが薄く、幅が広く、深さの深い形状をしている。具体的な寸法を示せば内法で厚さ4〜7mm×幅20〜30×高さ40〜60mmのDI成形容器で、この容器内に電池用部材が組み込まれ、蓋がレーザ溶接され密閉状態とされている。   Generally, an electronic device or the like has a built-in battery as a drive source, and an aluminum alloy is used for the battery container. For example, a container of a lithium ion secondary battery for mobile phones has a rectangular cross section, a thin thickness, a wide width, and a deep shape. If you show specific dimensions, it is a DI molded container with a thickness of 4 to 7 mm × width 20 to 30 × height 40 to 60 mm by an internal method, a battery member is built in this container, the lid is laser welded and sealed It is said that.

この電池容器は純Al系やAl‐Mn系の比較的軟質のアルミニウム板が使用されていたが、DI成形性だけでなく使用中の電池用部材の発熱に対して耐膨れ性も求められるところから、例えば、特許文献1には、Al‐Mn‐Si‐Fe‐Cu系合金にMgを適量添加した合金、或いはMgの他にさらにCr、Zr、Tiなどの元素を適量添加することによって、プレス成形性と耐膨れ性に優れた合金が提案されている。   This battery container used pure Al-based and Al-Mn-based relatively soft aluminum plates. However, not only DI moldability but also swell resistance against the heat generated by battery members in use is required. From Patent Document 1, for example, an alloy in which an appropriate amount of Mg is added to an Al-Mn-Si-Fe-Cu alloy, or an appropriate amount of elements such as Cr, Zr and Ti in addition to Mg, An alloy excellent in press formability and swelling resistance has been proposed.

また、特許文献2には、Al‐Mn‐Mg‐Si‐Fe‐Cu系合金に冷間圧延時の加工率、結晶粒径及び金属間化合物の面積占有率を規制することにより、ケースと蓋とのレーザ溶接性と耐圧強度に優れた合金が提案されている。   Patent Document 2 also discloses a case and lid by regulating the processing rate, crystal grain size, and area ratio of intermetallic compounds during cold rolling in an Al-Mn-Mg-Si-Fe-Cu alloy. An alloy excellent in laser weldability and pressure strength is proposed.

特開2000-336448号公報JP 2000-336448 特開2001-181766号公報Japanese Patent Laid-Open No. 2001-181766

前記断面が矩形の容器をDI成形するには、ブランク材は矩形よりも楕円形であることが板取段階で高歩留となって好ましく、しかもDI成形後の耳率を均等化させるためには、円筒容器に深絞り成形したときに圧延方向に対する45°耳率の高い板であることが求められている。
更に、電子機器類に内蔵される電池容器は軽量化の観点から薄肉化が求められている。
In order to DI mold the container having a rectangular cross section, it is preferable that the blank material is elliptical rather than rectangular in order to achieve a high yield at the plate cutting stage, and in order to equalize the ear rate after DI molding. In addition, a plate having a high 45 ° ear ratio in the rolling direction when deep drawn into a cylindrical container is required.
In addition, battery containers built in electronic devices are required to be thin from the viewpoint of weight reduction.

しかしながら、前記特許文献1で提案のものは、45°耳率に関する記載がなく、また特許文献2で提案のものは、45°耳率を高くするには、最終圧延率を高く取る必要があって、薄板のDI成形性を妨げ、しかもパルス溶接速度が遅い。しかも、いずれの特許文献も、容器そのものの高強度化は考慮されていない。   However, the one proposed in Patent Document 1 has no description about the 45 ° ear ratio, and the one proposed in Patent Document 2 requires a high final rolling ratio to increase the 45 ° ear ratio. In addition, the DI formability of the thin plate is hindered, and the pulse welding speed is slow. In addition, none of the patent documents considers an increase in strength of the container itself.

そこで、本発明は、このような問題を解消すべく案出されたものであり、薄肉のアルミニウム合金冷延板を素材とした矩形断面電池容器であっても、変形することなく安定した状態で使用することができる矩形断面電池容器を提供することを目的とする。   Therefore, the present invention has been devised to solve such problems, and even in a rectangular cross-section battery container made of a thin aluminum alloy cold-rolled sheet, it is stable without deformation. The object is to provide a rectangular cross-section battery container that can be used.

本発明のアルミニウム合金板を用いた矩形断面電池容器の製造方法は、その目的を達成するため、Si:0.10〜0.60wt%,Fe:0.20〜0.60wt%,Cu:0.10〜0.70wt%,Mn:0.60〜1.50wt%,Mg:0.20〜1.20wt%,Zr:0.12を超え0.20wt%未満,Ti:0.05〜0.25wt%,B:0.0010〜0.02 wt%を含有し、残部Alと不可避的不純物とからなるアルミニウム合金溶湯を半連続鋳造法で鋳造して得た鋳塊に温度500〜600℃で1時間以上保持する均質化処理を施した後、熱間圧延、中間焼鈍、冷間圧延を施した冷延板を素材として矩形断面電池容器を形作り、当該容器内に電池用部材を組み込んだ後に当該容器に蓋を合わせて合わせ部をパルスレーザ溶接する際、前記容器内に電池用部材を組み込む前に当該容器を40〜170℃の温度で加熱処理することを特徴とする。
アルミニウム合金は、更にCr:0.35 wt%以下を含有するものであってもよい。
In order to achieve the object, the manufacturing method of the rectangular cross-section battery container using the aluminum alloy plate of the present invention is Si: 0.10 to 0.60 wt%, Fe: 0.20 to 0.60 wt%, Cu: 0.10 to 0.70 wt%, Mn : 0.60 to 1.50 wt%, Mg: 0.20 to 1.20 wt%, Zr: more than 0.12 and less than 0.20 wt%, Ti: 0.05 to 0.25 wt%, B: 0.0010 to 0.02 wt%, the balance Al and inevitable impurities An ingot obtained by casting a molten aluminum alloy consisting of the above by a semi-continuous casting method is subjected to a homogenization treatment for holding for 1 hour or more at a temperature of 500 to 600 ° C., and then subjected to hot rolling, intermediate annealing, and cold rolling. When forming a rectangular cross-section battery container using the cold-rolled plate as a raw material, and incorporating the battery member into the container, the lid is fitted to the container and the mating portion is subjected to pulse laser welding. Before the assembly, the container is heat-treated at a temperature of 40 to 170 ° C.
The aluminum alloy may further contain Cr: 0.35 wt% or less.

本発明の製造方法により得られる電池用のアルミニウム合金板製矩形断面容器は、当該容器内に電池用部材が組み込まれる前に加熱処理されているために時効硬化されている。容器そのものが硬化されているため、薄肉素材を用いたものであっても、変形することなく安定した状態で使用することができる矩形断面電池容器を提供することができる。   The rectangular cross-section container made of an aluminum alloy plate for a battery obtained by the production method of the present invention is age-hardened because it is heat-treated before the battery member is incorporated into the container. Since the container itself is cured, it is possible to provide a rectangular cross-section battery container that can be used in a stable state without being deformed even if a thin-walled material is used.

上記した従来技術における課題を解決するために、発明者らは検討を重ねて、3000系またはこれにMgを含有させたアルミニウム合金にZr、TiおよびBの適量を共存含有させたアルミニウム合金の鋳塊に熱間圧延、中間焼鈍、冷間圧延を施したアルミニウム合金の冷延板を素材とし、成形加工によって容器本体と蓋体を形作り、容器本体に電池用部材を組み込んだ後に容器本体に蓋体を合わせ、合わせ部をレーザ溶接して矩形断面電池容器を製造する際に、変形が起きずに安定した状態で使用することができる容器を得ることができる手段について検討を重ねてきた。
その結果、容器本体を形作った後、容器本体に電池用部材を組み込む前に容器自体を熱処理して時効硬化させておくことが有効であることを見出した。
以下に、その詳細を説明する。
In order to solve the above-described problems in the prior art, the inventors have repeatedly studied to cast an aluminum alloy in which an appropriate amount of Zr, Ti, and B is coexistent in an aluminum alloy containing 3000 series or Mg. Using a cold rolled sheet of aluminum alloy that has been subjected to hot rolling, intermediate annealing, and cold rolling to the lump, the container body and lid are formed by molding, and the battery body is assembled into the container body, and then the container body is covered When manufacturing a rectangular cross-section battery container by joining the bodies and laser welding the mating portion, a means for obtaining a container that can be used in a stable state without deformation has been studied.
As a result, it has been found that it is effective to heat-treat the container itself by heat-treatment after forming the container body and before incorporating the battery member into the container body.
The details will be described below.

まず、素材のアルミニウム合金として、Si:0.10〜0.60wt%,Fe:0.20〜0.60wt%,Cu:0.10〜0.70wt%,Mn:0.60〜1.50wt%,Mg:0.20〜1.20wt%,Zr:0.12を超え0.20wt%未満,Ti:0.05〜0.25wt%,B:0.0010〜0.02 wt%を含有し、残部Alと不可避的不純物とからなるものを用いる。
更にCr:0.35 wt%以下を含有させたものでもよい。
First, as an aluminum alloy material, Si: 0.10 to 0.60 wt%, Fe: 0.20 to 0.60 wt%, Cu: 0.10 to 0.70 wt%, Mn: 0.60 to 1.50 wt%, Mg: 0.20 to 1.20 wt%, Zr: It contains more than 0.12 and less than 0.20 wt%, Ti: 0.05 to 0.25 wt%, B: 0.0010 to 0.02 wt%, and the remainder consisting of Al and inevitable impurities.
Further, Cr: 0.35 wt% or less may be included.

Si:0.10〜0.60wt%,
Fe:0.20〜0.60wt%,
Mn:0.60〜1.50wt%,
これらの元素は、アルミニウム合金板に強度を付与すると共に、Al‐Fe系、Al‐Mn系、Al‐(Fe,Mn)‐Si系等の金属間化合物を微細に分散形成して再結晶組織の微細化並びに、DI成形性を付与するためのものであって、下限値未満ではその効果が少なく耐膨れ性にも劣り、また、上限値を超えると粗大化合物を形成しDI成形性を低下させ、溶接性も劣ることになる。
Si: 0.10 to 0.60 wt%,
Fe: 0.20 ~ 0.60wt%,
Mn: 0.60-1.50wt%,
These elements give strength to the aluminum alloy sheet and recrystallize by forming finely dispersed intermetallic compounds such as Al-Fe, Al-Mn, and Al- (Fe, Mn) -Si. In addition to the refinement of DI and imparting DI moldability, if it is less than the lower limit, the effect is small and the swelling resistance is poor, and if it exceeds the upper limit, a coarse compound is formed and the DI moldability is lowered. The weldability is also inferior.

Cu:0.10〜0.70wt%,
Mg:0.20〜1.20wt%,
これらの元素は、アルミニウム合金板に強度を付与すると共に、加工硬化が大きく耐膨れ性を向上させるためのものであって、下限値未満ではその効果が少なく、上限値を超えるとパルスレーザ溶接性に劣り溶接速度を速くできない。
Cu: 0.10 to 0.70 wt%,
Mg: 0.20 ~ 1.20wt%,
These elements are intended to impart strength to the aluminum alloy plate and to increase work hardening and improve swell resistance, and are less effective at lower than the lower limit, and pulse laser weldability when the upper limit is exceeded. The welding speed cannot be increased.

Zr:0.12を超え0.20wt%未満,
Ti:0.05〜0.25wt%,
B:0.0010〜0.02 wt%
これらの元素は、共存させることによって、多種類の凝固核となる金属間化合物を生成させ、急冷凝固を伴う溶接ビード部の凝固時の割れ発生を防ぎパルスレーザ溶接の高速度化を可能とし、さらに低圧延率で円筒容器に絞り成形したときの45°方向の高耳率付与のためのものであって、下限値未満ではその効果が少なく、上限値を超えると45°耳率が高くなりすぎて矩形断面容器をDI成形したときの耳率が高くなって製品歩留が低下し、粗大化合物が生じて成形性が低下する。好ましくは、Zrは0.13〜0.19wt%であることが望ましい。
Zr: more than 0.12 and less than 0.20wt%,
Ti: 0.05-0.25wt%,
B: 0.0010 to 0.02 wt%
By making these elements coexist, they produce many types of intermetallic compounds that become solidification nuclei, prevent cracking during solidification of the weld bead part accompanying rapid solidification, and enable high speed pulse laser welding, Furthermore, it is for imparting a high ear rate in the 45 ° direction when drawn into a cylindrical container at a low rolling rate, and its effect is small if it is less than the lower limit value, and the 45 ° ear rate increases if the upper limit value is exceeded. When the rectangular cross-section container is DI molded too much, the ear rate is increased, the product yield is lowered, a coarse compound is produced, and the moldability is lowered. Preferably, Zr is 0.13 to 0.19 wt%.

Cr:0.35 wt%以下
必要に応じて添加される。Crを0.35 wt%以下含有させると、再結晶粒を微細化して容器の肌が美麗に仕上がる。なお、Crは返材等から不可避的に混入し、通常の溶製では0.01wt%以下含有しているので、Crの添加効果を顕在化させるには0.01wt%を超えて含有させる必要である。好ましくは、Cr0.1wt%以上、更に好ましくは、Cr0.15wt%以上である。
Cr: 0.35 wt% or less Added as necessary. When 0.35 wt% or less of Cr is contained, the recrystallized grains are refined and the container skin is beautifully finished. In addition, Cr is inevitably mixed from recycled materials, etc., and in normal melting, it is contained in an amount of 0.01 wt% or less, so it is necessary to contain more than 0.01 wt% in order to reveal the effect of adding Cr . Preferably, Cr is 0.1 wt% or more, and more preferably, Cr is 0.15 wt% or more.

不可避的不純物は原料地金、返材等から不可避的に混入する管理外のもので、それらの含有量は、例えば、Znの0.25 wt%以下、GaおよびVの0.05 wt%以下、その他各0.05 wt%以下であって、この範囲で管理外元素を含有しても本発明の効果を妨げるものではない。   Inevitable impurities are inevitably mixed from raw metal, return materials, etc., and their contents are, for example, Zn 0.25 wt% or less, Ga and V 0.05 wt% or less, and other 0.05 each Even if it is less than wt% and contains an element outside the control within this range, the effect of the present invention is not disturbed.

次に、前記説明の組成を有するアルミニウム合金溶湯は半連続鋳造法で鋳塊とし、均質化処理および熱間圧延し、中間焼鈍を経て最終圧延を施し所定強度ならびに45°耳率のアルミニウム合金板とする。
この際、均質化処理を500〜600℃の温度範囲で1時間以上の保持で行うとともに、最終冷間圧延を25〜55%の圧延率で行うことが必要である。
Next, the molten aluminum alloy having the composition described above is made into an ingot by a semi-continuous casting method, homogenized and hot-rolled, subjected to final annealing through intermediate annealing, and an aluminum alloy plate having a predetermined strength and 45 ° ear ratio And
At this time, it is necessary to perform the homogenization treatment at a temperature range of 500 to 600 ° C. for 1 hour or more and to perform the final cold rolling at a rolling rate of 25 to 55%.

均質化処理:500〜600℃×1時間以上
半連続鋳造法で鋳造して得た鋳塊の均質化処理は圧延を容易にするために高温に保持して鋳造偏析を解消するためのもので、その温度は500〜600℃で1時間以上保持することが必要である。この加熱温度が低すぎ、或いは保持時間が短いと,析出物のサイズが小さくて,焼鈍時再結晶粒が粗くなり,DI成形後の外観肌が綺麗に仕上がらない。また最終の圧延率が低くても耳率が7%を超え易く、所定の強度が得難い。加熱温度が高過ぎると、部分溶融する虞れがある。より好ましくは、520℃以上、590℃以下である。
Homogenization treatment: Homogenization treatment of the ingot obtained by casting at 500-600 ° C x 1 hour or more by semi-continuous casting method is to keep cast at high temperature and to eliminate casting segregation to facilitate rolling. It is necessary to hold the temperature at 500 to 600 ° C. for 1 hour or longer. If the heating temperature is too low or the holding time is short, the size of the precipitate is small, the recrystallized grains become rough during annealing, and the appearance skin after DI molding is not finished cleanly. In addition, even if the final rolling rate is low, the ear rate tends to exceed 7%, and it is difficult to obtain a predetermined strength. If the heating temperature is too high, there is a risk of partial melting. More preferably, it is 520 ° C. or higher and 590 ° C. or lower.

中間焼鈍:
中間焼鈍は再結晶組織を微細化するために昇温速度
5℃/sec以上の連続焼鈍が好ましく、その加熱温度も400℃以上とし、更に高温にすれば溶体化を兼ねることもできる。保持時間は10秒以内とするのが好ましい。
Intermediate annealing:
Intermediate annealing is the rate of temperature rise to refine the recrystallized structure.
Continuous annealing at 5 ° C./sec or higher is preferable, and the heating temperature is 400 ° C. or higher. The holding time is preferably within 10 seconds.

最終圧延:圧延率25〜55%
最終圧延は均質化処理温度と相まって45°耳率に影響が大きい。従って均質化処理を500〜600℃で1時間以上保持し、最終圧延を圧延率25〜55%とすることで45°耳率4〜7%のアルミニウム合金板を得ることができる。この最終圧延の圧延率が下限値未満では所定の強度が得られないと共に45°耳率が低く、上限値を超えると45°耳率が高くなりすぎて矩形断面容器をDI成形したときの製品歩留が低下すると共に延性が低くなって、DI成形時に金型肩部で割れが発生し易い。
Final rolling: Rolling rate 25-55%
The final rolling, combined with the homogenization temperature, has a large effect on the 45 ° ear rate. Accordingly, the homogenization treatment is maintained at 500 to 600 ° C. for 1 hour or longer, and the final rolling is performed at a rolling rate of 25 to 55%, whereby an aluminum alloy sheet having a 45 ° ear rate of 4 to 7% can be obtained. When the rolling ratio of this final rolling is less than the lower limit, the predetermined strength cannot be obtained, and the 45 ° ear ratio is low, and when the upper limit is exceeded, the 45 ° ear ratio becomes too high, and the rectangular cross-section container is DI molded. Yield decreases and ductility decreases, and cracks are likely to occur at the mold shoulder during DI molding.

上記のような成分組成が規定されたアルミニウム合金鋳塊に、条件を規定した均質化処理と最終圧延工程を含む均質化処理および熱間圧延し、中間焼鈍を経て最終圧延を施してアルミニウム合金板を製造すると、円筒容器に深絞り成形したときに圧延方向に対する45°耳率が4〜7%のとなるアルミニウム合金板材が得られる。
ここで、円筒容器に深絞り成形したときに圧延方向に対する45°耳率:4〜7%について説明する。
Aluminum alloy sheet in which the above-mentioned aluminum alloy ingot with the specified composition is subjected to homogenization treatment and hot rolling including the final rolling process and the final rolling process, and then subjected to final rolling through intermediate annealing. When an aluminum alloy sheet is manufactured, an aluminum alloy sheet having a 45 ° ear ratio of 4 to 7% with respect to the rolling direction when deep drawn into a cylindrical container is obtained.
Here, a description will be given of a 45 ° ear ratio of 4 to 7% with respect to the rolling direction when deep drawing is performed on the cylindrical container.

アルミニウム圧延板の円形ブランク材を円筒容器に深絞り成形すると、軟質材は圧延方向に対して平行な方向な0°方向および圧延方向に対して垂直な90°方向の容器周縁部に山形に発達した凸部を形成し、強加工材は45°方向の容器周縁部に山形の発達した凸部を形成する。この凸部を耳と称し、製品にした時には削除することとなっているので、材料の製品歩留を低下させる要因である。従って、通常は0°方向及び90°方向或いは45°方向に耳が偏って発達しない耳の均一な板が求められ、使用されている。   When deep blanking is performed on a circular blank of an aluminum rolled sheet in a cylindrical container, the soft material develops in a chevron shape at the periphery of the container in the 0 ° direction parallel to the rolling direction and in the 90 ° direction perpendicular to the rolling direction. The hard-worked material forms a convex part with a mountain shape on the peripheral edge of the container in the 45 ° direction. This convex part is called an ear and is deleted when it is made into a product, which is a factor of reducing the product yield of the material. Accordingly, there is a demand for and use of a uniform plate of ears in which the ears are not biased and developed normally in the 0 ° direction, 90 ° direction or 45 ° direction.

しかしながら、断面が矩形の容器をDI成形するには、ブランク材は矩形よりも楕円形であることが板取段階で高歩留となって好ましいが、耳の均一な板から得た長径または短径が板の圧延方向に平行な楕円形のブランク材を絞り加工すると、0°方向及び90°方向の容器周縁部に山形の凸部が発達し、45°方向に谷が形成され製品歩留を下げることとなる。
そこで前もって45°方向に耳が発達する板材を使用すれば、DI加工で耳を均一に成形できて製品歩留を向上することができる。すなわち、本発明方法で製造された45°耳率が4%以上7%以下のアルミニウム合金板をブランク材に用いることにより、従来型携帯用機器の電池容器として、製品歩留まりの高いDI製品を得ることができることになる。
However, for DI molding of a container having a rectangular cross section, it is preferable that the blank material is oval rather than rectangular because of the high yield at the plate cutting stage, but the long or short diameter obtained from the uniform plate of the ear When drawing an elliptical blank that is parallel to the rolling direction of the plate, chevron-shaped protrusions develop on the peripheral edge of the container in the 0 ° and 90 ° directions, and valleys are formed in the 45 ° direction, resulting in product yield. Will be lowered.
Therefore, if a plate material whose ears are developed in the direction of 45 ° in advance is used, the ears can be uniformly formed by DI processing and the product yield can be improved. That is, by using, as a blank material, an aluminum alloy plate having a 45 ° ear rate of 4% or more and 7% or less manufactured by the method of the present invention, a DI product with a high product yield is obtained as a battery container of a conventional portable device. Will be able to.

ところで、従来型携帯用機器の電池容器は、図1に示すように、断面矩形で蓋がパルレーザ溶接で接合されているもの一般的である。なお、図1中、1はその容器、2はその蓋、3は容器1と蓋2とをパルスレーザ溶接した溶接線である。
また、図2は、容器1を絞り加工するときの略楕円形のブランク材の平面図で、4はそのブランク材、5はDI加工するときのポンチの当たる位置を示す仮想線である。
前記本発明方法で製造したアルミニウム合金板をブランク材として、各種寸法の矩形断面の容器に成形加工されるが、例えば、板厚を0.6mmとし、絞り加工としごき加工を加えて容器とする。
By the way, as shown in FIG. 1, a battery container of a conventional portable device is generally one having a rectangular cross section and a lid joined by PAL laser welding. In FIG. 1, 1 is the container, 2 is the lid, and 3 is a weld line obtained by pulse laser welding the container 1 and the lid 2.
FIG. 2 is a plan view of a substantially elliptical blank material when the container 1 is drawn, 4 is the blank material, and 5 is a virtual line showing the position where the punch hits when DI processing is performed.
The aluminum alloy plate manufactured by the method of the present invention is formed into a rectangular cross-section container of various dimensions using a blank material. For example, the sheet thickness is 0.6 mm, and the container is made by drawing and ironing.

加工された容器は、電池用部材が組み込まれた後蓋を合わせ、合わせ部をパルスレーザ溶接して電池とされる。前記容器は電池用部材が組み込まれる前に該容器を40〜170℃の温度に加熱処理することによって時効硬化して高強度とすることができ、安定した状態で使用することもできるようになる。   The processed container is combined with a rear cover in which a battery member is incorporated, and the mating portion is subjected to pulse laser welding to form a battery. The container can be age-hardened to high strength by heat-treating the container to a temperature of 40 to 170 ° C. before the battery member is incorporated, and can be used in a stable state. .

次に容器に蓋を固定するパルスレーザ溶接を説明する。
容器に蓋を合わせ、その合わせ部を大気中、もしくは必要に応じてアシストガスとしてアルゴン等の不活性ガスを用いて溶接する。溶接条件は、板の厚さによって一様ではないが、パルス時間、出力、焦点はずし距離、溶接速度等を適宜定めて溶接する。即ち、パルス時間0.3〜5ms、1.5〜15ジュール/スポット、焦点はずし距離−5〜+10mm、溶接速度1〜30mm/sec.の範囲を目安として適宜採用することができる。
Next, pulse laser welding for fixing the lid to the container will be described.
The container is fitted with a lid, and the joint is welded in the atmosphere or, if necessary, using an inert gas such as argon as an assist gas. The welding conditions are not uniform depending on the thickness of the plate, but welding is performed by appropriately determining the pulse time, output, defocusing distance, welding speed, and the like. That is, a pulse time range of 0.3 to 5 ms, 1.5 to 15 joules / spot, a defocusing distance of -5 to +10 mm, and a welding speed of 1 to 30 mm / sec. Can be appropriately employed.

次に具体的な実施例について説明する。
表1に示す成分組成のアルミニウム合金溶湯を溶製し、半連続鋳造法で厚さ530mm、幅1100mm、金型からの冷却水2.5〜3.0リットル/cm分、鋳塊の引出速度40〜60mm/分で鋳塊を鋳造した。Zrの添加はAl‐Zr母合金、TiはAl‐Ti母合金、BはAl‐Ti‐B母合金を使用した。
Next, specific examples will be described.
Aluminum alloy melts with the composition shown in Table 1 were melted, 530mm in thickness and 1100mm in width by semi-continuous casting, 2.5 to 3.0 liters / cm of cooling water from the mold, ingot drawing speed of 40 to 60mm / The ingot was cast in minutes. Zr was added using Al-Zr master alloy, Ti using Al-Ti master alloy, and B using Al-Ti-B master alloy.



次に該鋳塊を面削後、表2に示す条件で均質化処理し,保持後熱延を開始し、終了温度400℃で厚さ6mmの熱延板とした。次いで冷間圧延4パスで各種厚さの冷延板とし、中間焼鈍処理を施した。中間焼鈍処理は電磁誘導加熱で520℃に加熱し、数秒保持後水焼入した。水焼入後最終冷間圧延して厚さ0.6mmの圧延板とした。この圧延板を用いて下記の測定をした。
その結果を併せて表2に示す。
Next, the ingot was chamfered, homogenized under the conditions shown in Table 2, hot rolling was started after holding, and a hot rolled sheet having a finishing temperature of 400 ° C. and a thickness of 6 mm was obtained. Next, cold-rolled sheets of various thicknesses were formed by cold rolling 4 passes and subjected to an intermediate annealing treatment. In the intermediate annealing treatment, heating was performed to 520 ° C. by electromagnetic induction heating, holding for a few seconds and then water quenching. A final cold rolling was performed after water quenching to obtain a rolled plate having a thickness of 0.6 mm. The following measurement was performed using this rolled sheet.
The results are also shown in Table 2.

<45°耳率>
円形ブランク材を円筒容器に深絞り成形して45°耳率を測定した。
45°耳率は次式から計算した。
45°耳率(%)=(H1−H2)/0.5(H1+H2)×100
ここでH1:底部から山部までの距離の平均値
H2:底部から谷部までの距離の平均値
<45 ° ear rate>
A circular blank was deep-drawn into a cylindrical container and the 45 ° ear rate was measured.
The 45 ° ear rate was calculated from the following equation.
45 ° ear rate (%) = (H1−H2) /0.5 (H1 + H2) × 100
Where H1: Average distance from the bottom to the mountain
H2: Average distance from the bottom to the valley

<製品歩留>
楕円形ブランク材を絞り成形後しごき加工し、内法で厚さ5mm×幅25mm×深さ50mmの有底容器を製作し、容器縁部を平らにするために切削し、材料の製品歩留を測定した。しごき加工率は50%とした。
製品歩留次式から計算した。
製品歩留(%)=製品重量/楕円形ブランク材重量×100
<Product yield>
Oval blank material is drawn and then ironed, and a bottomed container with a thickness of 5mm x width 25mm x depth 50mm is manufactured by the internal method, then cut to flatten the edge of the container, and the product yield of the material Was measured. The ironing rate was 50%.
Calculated from the product yield equation.
Product yield (%) = Product weight / Oval blank weight x 100

<溶接性>
得られた板を共材で突き合わせ、下記条件でパルスレーザ溶接し、割れの有無を40倍の光学顕微鏡で確認した。また一方の板を1100材として溶接したが、共材で溶接したときと同じ結果であった。割れ無しを〇印、割れ有りを×印で示す。
<Weldability>
The obtained plates were butted together with a common material, pulsed laser welding was performed under the following conditions, and the presence or absence of cracks was confirmed with a 40 × optical microscope. In addition, one plate was welded as 1100 material, and the same result was obtained as when welding with a common material. No cracking is indicated by a circle, and cracking is indicated by a cross.

表1,2の結果から、本発明例としてZr,TiおよびBが共に共存し、45°耳率が本発明の範囲内の試料(試料番号1〜12)は製品歩留高く、パルスレーザの溶接速度が速くても溶接割れの発生が認められず溶接性に優れていることが判る。またCrの含有している本発明の範囲内の試料(試料番号3、7、9)は容器の製品肌が優れていることが判る。   From the results of Tables 1 and 2, Zr, Ti, and B coexist as examples of the present invention, and the samples having the 45 ° ear rate within the scope of the present invention (sample numbers 1 to 12) have a high product yield. It can be seen that even if the welding speed is high, no weld cracking is observed and the weldability is excellent. It can also be seen that the samples (sample numbers 3, 7, and 9) within the scope of the present invention containing Cr are excellent in the product skin of the container.

一方、比較例としてZr,TiおよびBが共に不純物範囲で、かつ45°耳率の低い試料(試料番号13)は、製品歩留低く溶接割れが発生して、溶接性の低いことが判る。
また、Zr、Tiまたは Bの単独または2元素共存の試料(試料番号14〜22)は、溶接割れが生じ溶接性の劣ることが判る。
また、Zr、Tiまたは Bの本発明の範囲を超えて含有する試料(試料番号20〜22)は、DI成形時割れが発生し、成形性に劣ることが判る。
On the other hand, as a comparative example, a sample (sample number 13) in which Zr, Ti, and B are all in the impurity range and has a low 45 ° ear ratio has a low product yield and a weld crack, which indicates that the weldability is low.
In addition, it can be seen that the samples of Zr, Ti or B alone or in the presence of two elements (sample numbers 14 to 22) cause weld cracking and have poor weldability.
Further, it can be seen that samples containing Zr, Ti or B exceeding the scope of the present invention (sample numbers 20 to 22) are cracked during DI molding and inferior in moldability.

パルスレーザ溶接された断面矩形の蓋付き電池容器の概略を示す斜視図The perspective view which shows the outline of the battery container with a lid of the cross section rectangle welded by the pulse laser 断面矩形の電池容器を絞り加工するときの楕円形のブランク材の平面図Plan view of an oval blank when drawing a rectangular battery container

符号の説明Explanation of symbols

1:断面矩形の電池容器
2:容器1の蓋
3:パルスレーザ溶接した溶接線
4:ブランク材
5:DI加工するときのポンチの当たる位置を示す仮想線
1: Battery container having a rectangular cross section 2: Lid of container 1: Welding line 4: Pulsed laser welding 4: Blank material 5: Virtual line indicating the position where the punch hits when performing DI processing

Claims (2)

Si:0.10〜0.60wt%,Fe:0.20〜0.60wt%,Cu:0.10〜0.70wt%,Mn:0.60〜1.50wt%,Mg:0.20〜1.20wt%,Zr:0.12を超え0.20wt%未満,Ti:0.05〜0.25wt%,B:0.0010〜0.02wt%を含有し、残部Alと不可避的不純物とからなるアルミニウム合金溶湯を半連続鋳造法で鋳造して得た鋳塊に温度500〜600℃で1時間以上保持する均質化処理を施した後、熱間圧延、中間焼鈍、冷間圧延を施した冷延板を素材として矩形断面電池容器を形作り、当該容器内に電池用部材を組み込んだ後に当該容器に蓋を合わせて合わせ部をパルスレーザ溶接する際、前記容器内に電池用部材を組み込む前に当該容器を40〜170℃の温度で加熱処理することを特徴とするアルミニウム合金板を用いた矩形断面電池容器の製造方法。 Si: 0.10 to 0.60 wt%, Fe: 0.20 to 0.60 wt%, Cu: 0.10 to 0.70 wt%, Mn: 0.60 to 1.50 wt%, Mg: 0.20 to 1.20 wt%, Zr: more than 0.12 and less than 0.20 wt%, The ingot obtained by casting the aluminum alloy melt containing Ti: 0.05-0.25wt%, B: 0.0010-0.02wt%, the balance Al and inevitable impurities by the semi-continuous casting method, temperature 500-600 ° C After a homogenization treatment for 1 hour or more in the above , a rectangular cross-section battery container was formed using a cold-rolled sheet subjected to hot rolling, intermediate annealing, and cold rolling , and a battery member was incorporated in the container. An aluminum alloy plate characterized by heat-treating the container at a temperature of 40 to 170 ° C. before the battery member is incorporated into the container when the lid is fitted to the container and the joining portion is subjected to pulse laser welding. The manufacturing method of the used rectangular cross-section battery container. アルミニウム合金が、更にCr:0.35wt%以下を含有するものである請求項1に記載のアルミニウム合金板を用いた矩形断面電池容器の製造方法。   2. The method for producing a rectangular cross-section battery container using an aluminum alloy plate according to claim 1, wherein the aluminum alloy further contains Cr: 0.35 wt% or less.
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