TWI328890B - - Google Patents

Description

1328890 Π) Description of the Invention [Technical Field of the Invention] The present invention relates to an aluminum alloy plate for use in a battery container of an electronic device (device) to be assembled in a computer or a telephone, and an ear rate of 45 ° (mouth) The edge portion has a high local protrusion rate), DI (deep drawing and ironing) is good in formability, and is excellent in the aluminum alloy plate for a battery container having a rectangular cross section which is excellent in pulse fusion. [Prior Art] An electronic device or the like is used as a driving source to house a battery, and an aluminum alloy is generally used for the battery container. For example, a lithium ion secondary battery (battery) container for a mobile phone has a rectangular shape in cross section, a small longitudinal direction, a wide lateral width, and a large depth. Specifically, when the size is expressed, the inner dimension is 4 to 7 m ηι X transversely 2 0 to 3 0 m m X 4 0 to 6 0 m m of the D I molding container. The components for assembling the battery are housed in the container, and the laser welding cap is sealed. In the case of the battery container, a soft A-based or A]-Mn-based soft aluminum plate is used. However, not only D! moldability but also heat generation of the battery member in use is required. For the expansion resistance (bulging property), for example, Japanese Patent Laid-Open No. 2000- 3 3 64 8 8 (page 2, right column, Π~] 4 lines, the same page, the same block, 27~30 This is an investigation of this point, and it is revealed that an alloy having excellent press formability and bulging resistance is obtained by adding an appropriate amount of an element such as Cr, Zr, Ti or the like by adding Mg. Also in Special Opening 200 1-:18] Bulletin 766 (page 2, right column, lines 5 to 14, (2) (2)

Equalization requires deep extension of the cylindrical container to 45 for the light rolling direction. , high ear rate (high mouth edge) board. 1328890 on the same page, column 33~39) reveals that it is regulated

The processing ratio at the time of cold rolling of the Mg-Si-Fe-Cu-based alloy occupies φ in the area of the inter-crystal compound of the crystal grain to obtain an alloy having the concentricity and the weldability and compressive strength of the cap. As for the DI-forming material having the rectangular cross-section as described above, since the rectangular shape is oval, it will be 2 in the blanking stage, which is extremely desirable, and it is required to be localized in the formation of the ear after the DI forming. On the other hand, the battery container that is to be built into the electronic device is required to be thinner and thicker, and it is said that it is in the above-mentioned Japanese Patent Publication No. 2〇0〇-336488, and about the ear rate. According to the special opening 2〇0Bu]8〗μ6 No. Ear rate, there is a need to take a high final rolling rate which will hinder the DI formability of the sheet and also make the pulse picking speed slower. In order to solve the problems as described above in the prior art, the present purpose is intended to provide a high yield (production amount) of finished products, good moldability of thin DI, and excellent in pulse laser welding properties. SUMMARY OF THE INVENTION In order to solve the above-mentioned problems in the prior art, the inventors of the present invention have an A 1 - Μ η - diameter and an outer casing of a gold casing, and the embossing rate is light, and no bulletin is described. It is found that the alloy plate of the invention is repeated -6 - (3) (3) 1328890. It is found that the Zr, Ti is contained in the 3000 series or the aluminum alloy containing Mg. And the aluminum alloy sheet of B and B, even if the rolling ratio is low, will be 45 when deep drawing into a cylindrical container. The ear rate is high. It is superior to the product yield of rectangular DI molding, has a rectangular DI formability of a thin plate, and does not cause cracking even if the pulse laser welding speed is accelerated, and is excellent in productivity, so that the present invention is completed. That is, the present invention is a composition of an aluminum alloy plate, which is characterized by:

Si: 0.10 to 0.60 wt%,

Fe : 0.20~0.60wt%,

Cu : 0.10 to 0.70 wt%, Μη: 0.60 to 1.50 wt0/〇,

Mg: 0, 20~]. 20wt%,

Zr : 0· 12~0.2 0wt% (excluding upper and lower limits 値),

Ti: 0.05~0.25wt0/〇, B: 0.0010 ～0.02wt%, and the remaining part is A 1 and unavoidable impurities (impurities), which are formed by deep extension molding of a cylindrical container 45 in the rolling direction. Ear rate. In addition, the description of the numerical range described above and below is intended to include the upper limit and the lower limit unless otherwise specified. Since the composition is such a composition, the yield of the finished product is high, the rectangular shape of the thin plate is good, and the effect of the welding speed of the pulsed laser can be accelerated. When the composition of the aluminum alloy sheet is more than Cr: -7 - (4) 1328890 0.353⁄4 or less, in addition to the above-mentioned effects, the battery container outer panel having a rectangular cross section capable of performing pi molding is provided. It has become the effect of beauty. Hereinafter, elements related to the present invention will be explained.

Si: 0.] 0 to 0.60 wt%,

Fe : 0.2 0~0.6 0 wt%, Μ η : 0.6 0 〜1 . 5 0 wt %, these elements can impart strength to the aluminum alloy plate, and can make the A 1 -Fe system, AI-Mn system 'A 】-(Fe, Μη) -Si-based intermetallic compounds are dispersed to form fineness, so that the recrystallized structure can be made finer. When the DI molding property is lower than the lower limit, the effect is small and the expansion resistance is small. When the yield is not sufficient and the upper limit is exceeded, a coarse compound is formed, which lowers the moldability and lowers the weldability.

Cu : 0.10~0.70wto/〇,

Mg: 0.2 0 〜].2 0 wt %, these elements give strength to the alloy plate, and the work hardening is large, although the bulging resistance is improved, but when the temperature is lower than the lower limit, the effect is small, and When the upper limit is exceeded, the pulsed laser fusion is reduced, so that the dissolution rate cannot be accelerated. Z r : 0 . 〗 2~0.2 0 w t % (However, excluding upper and lower limits 値),

Ti: 0.05 to 0.25 wt%, B: 0.0 0 1 0 to 0.0 2 wt % These elements are such that when they coexist, an intermetallic compound which can form a plurality of types of solidified nuclei can be prevented from being accompanied by rapidity. Cooling and solidification causes cracking when the welded joints are solidified, so that the pulsed laser melts -8 - (5) (5) 1328890 can be achieved. Further, it is possible to impart a high ear rate in the 45° direction at the time of drawing (extension) molding of the cylindrical container at a low rolling ratio. However, when it is lower than the lower limit, the effect is small, and when the upper limit is exceeded, the ear rate is increased to lower the yield of the finished product, and a coarse compound is generated to lower the moldability. Ideally, Z r is at 0 . ] 3 to 0.1 9 w t %. When the Cr is contained in an amount of 0.35% by weight or less in addition to the above composition, the recrystallized particles can be made finer, and the outer panel of the container can be made more beautiful. In addition, 'Cr will inevitably mix in from the charge, and it will be 0. 0 wt% or less in the usual melt production. Therefore, the effect of adding Cr is more significant, and it is necessary to make it contain more than 0.01. Wt%. Preferably, Cr contains 0.1 wt% or more, more preferably 〇. I 5 wt% or more. However, when the upper limit is exceeded, the coarse compound is formed and the moldability is lowered, and the unavoidable impurities (impurity) are mixed into the element which is difficult to manage from the raw material metal, the recycled material, etc., but the contents are such as 〇 .25 wt% or less of Zn, 〇.〇5 wt% or less of Ga and V, each of which is 0.05 wt% or less of other elements 'however, even if it contains other elements managed by it' in this range, does not impair the effect of this invention. Next, it is explained that for the rolling direction 4 5 · ear rate 4 ~ 7 % » When the aluminum billet $L plate of the cylindrical billet is deep drawn to form a cylindrical container 'if it is a soft material, it will be in the roller The direction of the milk is licking. The peripheral portion of the container in the direction of 90° forms a convex portion that develops into a mountain shape: when the material is strongly processed, it forms a mountain shape in the peripheral portion of the container in the direction of 45 t (-9) (1) 1328890 Projection portion The bulge is called the ear, but it is necessary to eliminate it in order to become finished (productive), which may become an important factor in reducing the yield of the finished product. Therefore, 'the ear usually does not require the ear to be biased toward 〇. , 9 0 . Or a plate with uniform ears produced in the direction of 4 5 °. However, when the DI forming section is a rectangular container, as described above, the use of an elliptical billet which is more rectangular will result in a high yield in the sheet cutting stage and is ideally obtained from the ear. The long diameter or short diameter of the elliptical blank can be extended (drawn) by 90° if it is parallel to the rolling direction. The peripheral portion of the container in the direction develops a convex portion of the mountain shape at 4 5 . The direction forms the valley, which will reduce the finished product. For this reason, if it is adopted in advance, it will face 4 5 . When the sheet of the long ear is directional, it can be formed into a uniform ear by processing by D I, so that the yield of the finished product can be improved. That is, the above-mentioned conventional battery container carrying a crucible is used 45. A billet having an ear rate of 4% or more and 7% or less can obtain a finished product of high yield of finished product. [Embodiment] Next, a method for producing an aluminum alloy sheet according to the present invention will be described. The aluminum alloy molten metal having the aforementioned composition is formed into a prayer ingot by a semi-continuous casting method, and homogenization treatment and hot rolling are performed, and the predetermined strength is obtained through intermediate annealing and final (finished) rolling. And has 4 5 . The ear rate of the gold alloy plate. -10 - (7) (7) 1328890 The homogenization treatment of the ingot obtained by the result of casting by the semi-continuous casting method is to maintain the temperature of the ingot for easy rolling and to remove the segregation. Ideal for 5 0 0~6 0 0 . (: Keep it for more than one hour. If the heating temperature is too low, or the holding time is too short, the size of the crystallization material becomes small, causing the annealed recrystallized particles to become coarse, so that the appearance of the outer sheet cannot be completed after the D1 molding It is beautiful and beautiful. When the final rolling rate is low, it is easy to make the ear rate exceed 7%, so that the predetermined strength cannot be obtained. When the heating temperature is too high, it will have local melting enthalpy. More ideal homogenization treatment The temperature is in the range of 520 ° C or higher and 590 ° or less. The intermediate annealing is to make the recrystallized structure fine, and therefore it is desirable to carry out continuous annealing at an elevated temperature of 5 ° C /sec or more. The heating temperature is 4 ° C or higher, and it can also be used for melting at a higher temperature. The holding time is preferably within 10 seconds. The final rolling will be complementary to the homogenization temperature for 40%. The influence of the ear rate will become larger. Therefore, the homogenization treatment is carried out for 5 〇〇OQ ~ 600 t for more than -hour, and when the final rolling is performed with a rolling ratio of 25 to 55%, '45° can be obtained. Aluminum alloy with an ear rate of 4 to 7% If the temper rolling rate of the final rolling does not reach the squat, the predetermined strength cannot be obtained and the 45° ear rate will be low, but when the upper limit 値 is exceeded, the 45° ear rate will become too high. As a result, the yield of the finished product at the time of D] molding is reduced and the ductility is lowered. Therefore, it is easy to cause cracking at the shoulder of the mold when D is formed. However, the board obtained as described above will The rectangular cross-section container of various sizes is formed as described above, for example, with a plate thickness of 〇6 mm, and -11 - (8) (8) 1328890 is subjected to extension processing and ironing to form a container. After assembling the components for the battery, the cover is covered, and the battery is formed by pulse laser welding to the cover portion, but if the battery member is assembled to the container, the temperature of the container is 40 to 1 70 ΐ: When heat treatment is performed, it is aged and hardened to be high-strength, and can be used in a stable state. Next, the pulsed laser welding for fixing the lid to the container will be described. Align the cover to the container and cover the alignment. unit In the atmosphere, or as an auxiliary gas (auxiliary), an inert gas such as argon (blunt gas) is used for welding. The welding condition depends on the thickness of the plate, but the pulse time, output, and focus can be appropriately set. The distance, the welding speed, etc. are used for welding, that is, the pulse time is 0.3 to 5 ms, 1.5 to 15 joules per point, the distance from the focus is -5 to + 10 mm, and the welding speed is 1 to 3 0 m. The range of ni / sec is appropriately adopted as the target 'but these conditions are not limited by the above. Next, an embodiment relating to specificity will be described. (Example)) First, a molten metal of the alloy is prepared by melting. Ingots having a thickness of 53〇mni'width ilOOrnm were cast by a semi-continuous casting method with a cooling water of 2.5 to 3.0 liters/c η Ί minutes from the mold and a drawing speed of 40 to 60 mm / minute. Further, the addition of the Zr system uses the Al-Zr master alloy, and the addition of the Ti system uses the Ai-Ti master alloy. The addition of the B system is carried out using the Al-Ti-B master alloy. This composition is shown in Table 1. - -12- (9) (9) 1328890 After the ingot was cut, homogenization treatment was carried out, and after hot rolling, hot rolling was started, and a hot-rolled sheet having a thickness of 6 mm was obtained at a completion temperature of 40 0 t. Next, cold-rolled sheets of various thicknesses were obtained by performing four cold rollings, and an intermediate annealing treatment was performed. The intermediate annealing treatment was carried out by electromagnetic induction heating to 50 2 t, and was maintained for several seconds to carry out water quenching. After the water is itch, it is cold rolled to form a rolled sheet having a thickness of 0.6 m. The rolled sheet was used to carry out the measurement as described below. The measurement results are shown in Table 2. <45° ear rate> A round blank was subjected to deep drawing into a cylindrical container to measure a 45 ° ear rate. 4 5 ° ear rate (%) = ] 0 0 ( Η Η - Η 2 ) / 0.5 ( Η ) + Η 2 ) Here, Η 1 : the average distance from the bottom to the mountain 値Η 2 : from the bottom to Average value of the distance to the valley section <Production yield rate> After elliptical billet is drawn (extended) and then ironed, the inner dimension is 5 mm in length, 25 mm in width, and 50 mm in depth. The bottom container is cut to make the edge of the container flat, and the finished product yield of the material is measured. The screed processing rate is 50%. The yield on finished products is calculated by the following formula. -13 - (10) (10)1328890 Finished product yield (:%) = finished weight / ellipsoidal billet weight xl 00 <welding property> The obtained board is made of common materials to face to face, and below The surface conditions were subjected to pulsed laser welding, and it was confirmed by a 40-fold optical microscope whether or not cracks were generated. Take the other board as a yo! The tantalum material is used to perform the fusion, and the result is the same as when welded by a common material. It will be marked with 〇 mark. No cracks appear. X mark indicates cracking.

[Pulse laser fusion] Dissolution speed Low speed 5mm / sec High speed 2 0mm / sec One pulse time: 0.5ms Output: 2.5 joules / point away from the focus distance: Adjusted to the fusion width is ]mm Frequency: 1 00Hz -14 - (11 ) (11) 1328890 (Table 1) Composition (unit: Wt%)

σ main symbol Si Fe Cu Mn Mg Zr Ti B Cr Remark A 0.20 0.50 0.15 0.70 0.90 0.14 0.11 0.004 Inventive Example B 0.20 0.55 0.15 1.00 0.80 0.15 0.11 0.005 // C 0.50 0.30 0.60 1.40 0.40 0.18 0.14 0.010 0.30 D 0.20 0.55 0.64 1.00 0.80 0.15 0.11 0.0018 . E 0.20 0.55 0.64 1.00 0.80 0.15 0.11 0.0015 . F 0.20 0.55 0.64 1.00 0.80 0.15 0.11 0.0015 '/ G 0.20 0.55 0.64 1.00 0.80 0.15 0.11 0.0018 0.30 /7 Η 0.15 0.55 0.15 1.00 0.8 0.15 0.13 0.0017 . / I 0.15 0.55 0.15 1.00 0.8 0.15 0.13 0.0020 0.25 // J 0.20 0.52 0.15 1.19 0.25 0.14 0.06 0.0015 ” K 0.20 0.42 0.64 1.03 0.62 0.15 0.07 0.0016 .. VL 0.15 0.38 0.15 1.05 1.00 0.15 0.07 0.0017 _ // Μ 0.20 0.40 0.60 1.0 0.60 _ _ _ • Comparative Example N 0.15 0.39 0.16 1.0 1.00 _ . 0.010 . '/ 0 0.20 0.55 0.64 1.0 0.80 0.] 5 0.03 . . η P 0.20 0.55 0.64 1.0 0.80 0.01 0.11 _ // 0 0.30 1.2 0.3 0.5 0.5 0.2 0.15 . 0.30 // R 0.15 0.38 0.15 1.05 1.00 . 0.10 0.010 // S 0.20 0.60 0.15 1.0 0.80 0.15 . 0.010 . η T 0.15 0.38 0.15 1.05 1.00 0.25 • _ _ // u 0.15 0.38 0.15 1.05 1.00 . 0.30 _ 〃 V 0.15 0.38 0.15 1.05 1.00 • 0.05 _ V Note 1. Remaining part A1 and other unavoidable impurities -15- (12) (12) 1328890 (Table 2 Conditions and measurement results Sample number using alloy symbol homogenization treatment temperature °c X time Rolling ratio after intermediate annealing (%) 45° ear rate (%) Finished product yield % finished product weldability crack low speed, Speed Endurance (MPa) Remark 1 A 590x 5 30 5.5 55 Liangzhu 207 Inventive Example 2 B ft 50 6.0 57 Liangzhu 215 3 C 525x 5 40 6.5 60 〇〇 231 〃 4 D 590x 5 50 6.5 60 Good 〇〇237 〃 5 E // 30 5.4 54 Liangzhu 239 // 6 F // 30 5.6 56 Liangzhu 245 // 7 G ” 40 6.4 59 Excellent 248 // 8 Η 35- 6.0 57 Liangzhu 〇220 // 9 I // 35 6.1 58 〇〇 230 〃 10 J // 32 5.4 54 Liang 203 // 11 κ ” 31 6.0 57 Liangzhu 254 // 12 L // 32 5.8 59 Liangzhu 〇208 // 13 Μ // 31 2.0 35 Good XX 250 Comparative Example 14 N // 32 2.2 37 Good XX 205 35 0 // 30 5.0 5] Liangzhu X 254 η 16 P 32 3.1 44 良 XX 251 // 17 Q // 30 7.5 Cracks 240 X 240 18 R » 30 3.5 45 Good XX 205 ” 19 S // 30 5.0 52 Good XX 210 η 20 T // 32 8.9 Cracks 〇 X 225 / / 21 u // 32 3.9 Cracks 〇 X 215 // 22 V // Ο 〇 JJ 2.1 Cracks XX 201 Note 2. 〇 Print: No cracks X: Cracks - 16 - (13) (13) 1328890 As a result of Tables 1 and 2, it is ascertained that the examples Zr ' and B of the present invention coexist together, and the sample (sample number) having a 45 ° ear rate within the scope of the present invention has a high yield of the finished product. Even if the welding speed of the laser is faster, there is no weld crack, and it is excellent in weldability. Further, the sample (sample No. 3 '7, 9) within the scope of the present invention containing Cr was found to be excellent in the outer skin of the finished product of the container. On the other hand, as a comparative example, Zr, Ti, and B are all in the impurity range, and the sample having a low 45° ear rate (S pattern number 13) has a low yield and a weld crack, which can be observed. Low weldability. Further, Zr, Ti or B is a sample in which a single or two elements coexist (sample No. I 4 to 2 2 ), and a weld crack is generated, and it is found that the weldability is low. Further, the sample having a content of Zr, Ti or B exceeding the range of the present invention (sample No. 2 to 22) was cracked during the DI molding, and the moldability was found to be poor. As stated above, the aluminum alloy sheet of the present invention is at 45. The ear rate is high, and the pulse laser welding property is excellent, so that the battery container of rectangular cross section can be manufactured with high yield and the cover can be welded at a high speed for the container, so that the productivity in manufacturing the battery is high, Various industrial effects. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a squint (stereo) 3 of a battery container with a lid which is subjected to pulse laser welding. Figure 2 is a plan view of a slightly elliptical blank when the container is to be stretched. -17- (14) 1328890 [Symbol description] 1 : (battery) container 2: cover (sub) 3: container 1 and cover 2 Pulse welded fuse wire 4: blank 5: The dotted line at the position where the punch will touch when performing DI machining. -18 -

Claims (1)

1328890 (1) Pickup, Patent Application No. 1. An aluminum alloy plate for a battery container having a rectangular cross section, which is characterized by: Containing: Si: 0 . ] 0 to 0.6 0 w 1 % ' F e : 0.2 0 to 0.6 0 wt %, C u - 0.]0~0.70wt%, Μη: 0.6 0 〜1 . 5 0 wt %, M g : 0.2 0 〜1 . 2 0 wt %, Zr : 0.12 to 0.20 wt% (excluding upper and lower limits 値), Ti: 0.05 to 0.25 wt%, B: 0.0 0 1 0 to 0.0 2 wt The %, and the remaining portion are formed by A j and unavoidable impurities, and the ear container has a 45° ear rate of 4 to 7 % for the deep drawing of the cylindrical container. 2. Aluminium alloy sheet for a battery container of a rectangular cross section according to the scope of the patent application, wherein the composition of the aluminum alloy sheet further contains C!·: 0.3 5 wi% or less. -19 -