TW201120223A - Aluminum alloy sheet for battery lid, battery lid and method for producing the same - Google Patents

Abstract

To provide an aluminum alloy sheet for a battery lid integrally molded with an explosion-proof part, which minimizes a fracture caused by an increase of an inner pressure in a battery case because the explosion proof part is integrally molded in the battery lid simultaneously when the battery lid is press-formed, of which the individual sheet thickness in the explosion proof part does not need to be measured after having been press-molded, and which does not need to be annealed in order to adjust its strength. The aluminum alloy sheet for the battery lid has a composition comprising, by mass%, 1.15-1.35% Fe, 0.40-0.60% Mn, further 0.005-0.15% Ti or 0.005-0.15% Ti and 0.0005-0.05% B, and the balance Al with impurities, Among the impurities, Si is controlled to 0.15% or less, Cu to 0.05% or less, and Mg to 0.05% or less.

Description

201120223 VI. Description of the Invention: [Technical Field] The present invention relates to an aluminum alloy plate for a battery cover, which is an aluminum alloy plate suitable for an explosion-proof integrally formed battery cover, which is manufactured when the cover is manufactured The explosion-proof portion of the cover is formed by press working, and the forming portion may not need to be annealed. [Prior Art] A battery for a mobile device such as a mobile phone is a rechargeable battery that can be charged and discharged by placing an electrolytic substance in an aluminum or aluminum alloy casing from the viewpoint of weight reduction. However, such a chargeable and dischargeable sealed battery has always had the following problems: in the case of overcharging or overexposure, etc., the temperature inside the battery rises, and the welded portion of the battery case wall, the battery case, and the cover may occur. The damage is caused by the internal liquid leakage. Yes, this type of electricity, Meng used in, for example, a mobile phone, uses a small size of 5 〇 χ χ width and thickness of about 6 _, so the board for ι box must rely on stretching and thinning stretching (again In addition, in the future, large-scale mobile phones such as automobiles will be considered to expand the sides according to the above-mentioned size, and the battery can be stacked on the basis of the above-mentioned size. In this case, the material for the battery case is easy to be DI-protected and requires light weight 095143892 (sub-case) 201120223. Quantitative, high-strength, and workability. As a material satisfying this performance, it is proposed in Patent Document 1. A3003 series of aluminum alloy plate, the quality of the plate is Μη 0·8~2. 0%, Fe 0 6% or less, 〇· below, the amount is as good as % •, the remaining part is mainly aluminum; In the literature 2, an aluminum alloy plate is proposed, the 々% of which is Μη 0. 3~1. 5%, Fe 1. 6~1. 8%, and the rest is composed of aluminum and >

Therefore, in recent years, as described in Patent Document 3, it has been proposed to prevent an accident from occurring in a specific part of the battery cover before the occurrence of the above-mentioned damage accident. . There are various specifications. However, when the thickness is usually about 20/m, the pressure of 3 MPa is set as the reference for the pressure resistance of the explosion-proof part, and the explosion-proof part is broken by the attachment and the force. In the case of work force, the Ministry of Health, in particular, proposes: by providing a fixed opening in the battery cover and adhering the aluminum foil with a lower pressure than the battery case at the opening portion, thereby making the electricity #,

With explosion-proof function. Further, according to the invention described in Patent Document 3, the method of adhering the thin metal plate to the open σ portion of the Xunike cover as the explosion-proof portion is not required, so that it is not necessary to inspect the thin metal plate, and the test is performed. Good results with significant cost reductions. In the invention described in Patent Document 3, since it is necessary to additionally attach a metal thin plate as an explosion-proof ruthenium, it is necessary to carry out the inspection while increasing the manufacturing steps, but it is necessary to additionally check 疋No, l is tight, so the number of manufacturing steps of the battery as a whole is increased, and there is a problem of poor workability of 095,143,892 (sub-case) 5 201120223. [Patent Document 2] JP-A-2002-134069 [Patent Document 2] Japanese Patent Laid-Open Publication No. Hei. No. Hei. No. Hei. No. Hei. Solution to the Problem) The present invention provides an lg alloy plate for a battery cover of a seed-forming type that solves the above problems, and which is also used for the use of an anti-knocking portion, and also for an explosion-proof portion. ==:=:= After the shape, the thick part of the explosion-proof part is tested one by one, and the annealing process is = degree. In order to make the best use of the advantage of integrally forming the sheet portion on the lid portion, the inventors of the present invention have attempted to investigate a film which is to be tested for film thickness after molding. As a result, it was found that the specific composition_alloy plate was used as the cover material, and the explosion-proof portion was formed into a sheet shape by press working, and the pressurization process was able to obtain sufficient compressive strength 'annealing treatment for the purpose of strength adjustment' Thus, the present invention has been completed. That is, the molybdenum alloy sheet for a battery cover of the present invention is characterized in that its composition is represented by mass% of Fe 1.15 to 1.35%, Μη 0.40 to 〇. 60%, and further contains Ti 0. 〇〇5~〇 15%以下,Cu, as a impurity, the Si is 0. 15% or less, Cu, as the impurity, the Si is 0. 15% or less, Cu is 0.1% or less, and is 0. 0005~0. 15% and Β 0. 0005~ 095143892 (sub-case) 6 201120223 〇 〇 5% or less, Mg 〇. 05% or less. According to the aluminum alloy plate for battery cover of the present invention, when the aluminum alloy plate of the composition is used and the battery cover is press-formed, the strength of the explosion-proof portion of the press-formed portion is easily obtained to obtain a specified compressive strength, and has an annealing which does not require strength adjustment. effect. Further, the other battery cover for a battery cover of the present invention is characterized in that it has an explosion-proof portion which is press-formed to a predetermined thickness and which is not annealed. According to the aluminum alloy sheet for a battery cover of the present invention, the portion corresponding to the explosion-proof portion is press-formed, and when the press-forming is performed to a predetermined thickness, the specified pressure-resistant strength is easily obtained even if the annealing portion is not subjected to the annealing treatment. There is an effect of annealing treatment without intensity adjustment. A battery cover having an explosion-proof portion having a thickness of 10 to 30 m, preferably 15 to 27 #m by press working can obtain more excellent effects. (Effect of the Invention) According to the aluminum alloy sheet for a battery cover of the present invention, the explosion-proof portion is formed into a predetermined thickness by press forming, and the obtained explosion-proof portion has high pressure resistance and conforms to standards, and does not require strength adjustment. The annealing treatment does not cause the strength of each explosion-proof portion to be uneven due to the uneven annealing temperature at each position in the annealing furnace during the annealing treatment. The strength of the explosion-proof portion is stable, and the place other than the explosion-proof portion is not inadvertently broken. The situation. Further, unlike the subsequent adhesion of the metal thin plate, since the explosion-proof portion is integrally formed, there is no risk of liquid leakage due to a defective subsequent adhesion step. Therefore, it is possible to provide 095143892(^-3⁄4) 7 201120223 for a sealed battery such as a lithium ion battery with high reliability and high reliability. [Embodiment] Hereinafter, an aluminum alloy plate or the like for a battery cover of the present invention will be described with reference to the drawings and the embodiments. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic view showing a cross section of a battery having a battery cover of the present invention, and Fig. 2 is a schematic view showing the upper surface of a battery having a battery cover of the present invention. 1 is a sealed battery; 2 is a battery case; 3 is a cover of the battery case 2 made of an aluminum alloy plate for a battery cover formed by the composition of the present invention; 4 is an electrolytic substance housed in the battery case 2, for example, lithium The ion becomes the electrolytic substance of the medium; 5 is the + terminal of the battery; 6 is the insulator wrapped around the + terminal 5; 7 is the wire connecting the + terminal; 8 is the wire connecting the terminal, thereby making the battery cover 3 a terminal; Further, 9 is an injection port of the electrolyte 4, and is closed after injection; 10 is a mounting port of the + terminal 5; 11 is an explosion-proof portion; and 12 is a welded portion for sealingly sealing the battery cover 3 and the battery case 2 around. Next, the alloy composition of the battery cover 3 will be described.

Fe 1. 15~1·35% Μη 0.40~0.60%

Both Fe and Μη are used to give a compressive strength. When the content of Fe and Μη does not reach the lower limit value, the specified compressive strength is not obtained, and when the upper limit is exceeded, the compressive strength is excessively high, and tempering for the purpose of remaining strength adjustment is required. When the Al-(Fe-Mn)-based compound is coarsened and increased, the press formability is deteriorated, and it is difficult to obtain an explosion-proof portion having a stable thickness. 095143892(子案) 8 201120223

Ti 0. 005~0· 15% or

Ti 0. 005~0. 15% and B 0. 0005~〇. 05% Τι, or Τι and β are substances which prevent casting cracks during casting, and form Al-Ti or Al-Ti-B in the melt. The compound has the effect of preventing casting cracks during casting. It is also possible to add only Ti, but when Ti and B are added at the same time, the effect of preventing casting cracks is better. The remainder is A1 and impurities. When Si as an impurity exceeds 〇. 15%, Cu exceeds 〇. 05%, and Mg exceeds 0.05%, the unevenness of work hardening is increased by press working, and it is difficult to obtain a stable compressive strength. Explosion-proof part. Further, 'Si forms an Al-Fe-Si-based compound and deteriorates press formability, and it is difficult to obtain an explosion-proof portion having a stable thickness. Therefore, it is desirable to reduce it to less than Q. 12% or less, preferably 〇·10% or less. . The content of the other impurities is in the usual range, for example, Zri is 〇. 25% or less, preferably 0.20% or less. 〇为〇. 1〇% or less, preferably below. The aluminum alloy sheet thus constituted can be manufactured into a battery board by a usual manufacturing method. That is, the melt of the adjusted composition is subjected to a melt heat treatment in accordance with the need after casting, and hot rolling, cold rolling, and heat treatment are appropriately added to form an aluminum alloy sheet having a desired thickness. The aluminum alloy plate may be a coffin. If the subsequent press forming is considered, it is necessary to subject it to cold rolling of about 15% or more to harden it, so that the strength of the cover body can be increased without being easily damaged. Aluminium alloy 095143892 (sub-case) 9 201120223 The finer the crystal grain size of the plate coffin, the better the compressive strength can be obtained with good_formability, and it can be converted to a stable value. The crystal grain size is on average below 25# FH, preferably in the absence of coarser crystalline particles. The scale can be made by DC method or cc method. A thin alloy plate having a thickness of about lmn] is formed into a battery cover of a predetermined shape by a punch forming. In this case, the partial thickness of the explosion-proof portion is about 2 or so, and the annealing process is not performed. It is possible to easily obtain the resistance (four degrees) which is the standard value of the explosion-proof portion, and X, even if the standard value of the explosion-proof portion is changed, the partial thickness of the explosion-proof portion can be adjusted to match the Ikt value to obtain a suitable pressure resistance. That is, the standard value is down, if it is _ thicker. When the thickness of the explosion-proof portion is less than 1 〇, the grain is likely to be broken, which is not preferable. It is best to be above 15_. The upper limit value is also affected by the standard value, and when it is otherwise, the effect of the present invention can be exerted on other alloy sheets. It is best to be below 27_. In this way, only by stamping, it can meet the standard value of the explosion-proof part, and no annealing treatment for adjusting strength is required. In addition, the thickness of the board should vary depending on the strength of the battery model. In addition, the battery cover of the Ud board and the battery case are also excellent in laser solderability. (Examples and Comparative Examples) 10 095143892 (Sub-case) 201120223 (Table 1) Composition of sample plate (unit: mass 0 / 〇) Composition symbol Example Example Comparative example Comparative example

Si 07 07 I. 15 0. 20

Fe

Cu Μη

Mg

Cr

Zn

Ti

B

A1 and other impurities I Remarks 1. 20 1. 30 0. 20 0. 20 0. 02 0. 02 0. 02 15 0. 50 0. 02 0. 02 0. 10 0. 04 0. 003 Remaining part + this Inventive Example 0. 45 〇. 02 0. 02 0. 10 0. 04 The remainder of the present invention is 0. 02 0. 01 0. 00 0. 00 0. 04 0. 003 The remaining part A1050 1. 0. 02 0. 02 0. 05 0. 04 0. 003

The remaining part I A3003 will have the composition shown in the embodiment i of Table 1 and the comparative example 2, and the cold-rolled processing plate of the thickness of 1 coffee is used as the sample plate, and the explosion-proof portion of the battery cover is set. And it is formed into a thickness of a heart m (pressing rate of 98.0%, which is 1 inch) by a die forming to measure the local compressive strength. Further, the composition shown in the actual form of the surface was used, and the cold-rolled processing of the leg having the degree of the material was used as a sample plate, and the thickness was 25 (four) by the same press forming as described above (the press working ratio) For the explosion-proof part of 97.5%, n is 10), to measure the local pressure resistance 095143892 (-^3⁄4) 11 201120223 / In addition, there will be a table! In the composition shown in Comparative Example 2, the (10) plate was dusted to a temperature of 20 / zm (η is 1 〇) and heated, and annealed in an annealing furnace based on a temperature difference to measure the compressive strength. The above measurement results are shown in Table 2. In addition, the press working ratio can be calculated by the following calculations: (substrate thickness - thickness after press forming) / substrate thickness X 1_ - again 'compressive strength is a closed portion in which a specified area is formed in a sample of a specified thickness The pressure at which the oil pressure is increased in the sealed portion to break the sample. φ (Table 2)

According to the results of Table 2 'sample number 卜 2 (composition symbol: Example!, the pressure resistance after the ink forming is more than the sample number 3 (composition symbol: ratio 2) compared with the case 1), than the sample number 4 (composition Symbol: Comparative Example 2) Low. In addition, the sample number Shima 1 (the composition symbol: Example 1) is close to 3 MPa under the standard thickness 20 # m; the thickness of the sample number 2 (composition symbol: Example 2) becomes thicker, and the compressive strength is improved, @ This can be done without annealing the wire after the wire is pressed for strength adjustment. In addition, the unevenness of the sample number 5 (composition symbol: comparison 2) after the annealing treatment becomes larger than the unevenness of the sample number 4 (composition number 095143892 (sub-case) 12 201120223 comparative example 2), so judging by joining There is no benefit to the annealing step. (Industrial Applicability) ^ The aluminum alloy sheet for a battery cover according to the present invention can be used only for press forming* to obtain an optimum compressive strength, and therefore can be used for a mobile phone such as a mobile phone or a car. The cover of the sealed sealed battery is of great industrial value. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic view showing a cross section of a battery having a battery cover of the present invention. Fig. 2 is a schematic view showing the upper surface of a battery having a battery cover of the present invention. ' [Main component symbol description] 1 Closed battery 2 Battery case φ 3 Aluminum alloy battery cover 4 of the present invention Electrolytic substance 5 Battery + terminal. 6 Insulator. 7 Connection + terminal wire 8 Connection - Terminal wire 9 Electrolysis Injection port 10 of substance 4 + Mounting port of terminal 5 095143892 (sub case) 13 201120223 11 Explosion-proof part 12 of aluminum alloy plate for battery cover of the present invention Welding part 095143892 (sub case) 14

Claims (1)

201120223 七 申请 申请 申请 申请 申请 申请 申请 申请 申请 申请 申请 申请 申请 申请 申请 申请 申请 申请 申请 申请 申请 申请 申请 申请 申请 申请 申请 申请 申请 申请 申请 申请 申请 申请 申请 申请 申请 申请 申请 申请 申请 申请 申请 申请 申请 申请 申请 申请 申请 , , , , The remainder is composed of A1 and impurities. 'As an impurity, the amount is 〇15% or less, Ci^〇〇5% or less, and Mg is 〇. 〇5% or less. 2. The aluminum alloy plate for a battery cover according to the ninth aspect of the invention, wherein the explosion-proof portion is formed by being stamped and formed without being annealed. 〃 3·—The battery cover' is equipped with a battery cover with an explosion-proof part. The above-mentioned explosion-proof part is composed of t, two gold, and the battery cover is formed. The composition of the above-mentioned alloy is not contained in the mass %. 15~135%, Mn m _, or ^ 〇· :05~〇. 15% or Ti 〇. 〇〇5~〇.(10) and B 〇. _5~〇.Na, the remaining P-knife consists of A1 and impurities As the impurity, Si is 〇·15% or less, Cu is 0.05% or less, and % is 〇〇5% or less. _ μ Patent: 电池 Item 3 of the battery cover, wherein the above-mentioned explosion-proof stamping and forming, and no face fire treatment. In the method of manufacturing a battery cover, a battery cover having an explosion-proof portion is manufactured by punching an explosion-proof portion made of an aluminum alloy and forming a disk body, and the composition of the shirt gold is expressed by mass%. Contains eh 15~1 35〇/〇, Mn 0. 40~0· 60%, or Ti 0. 005~〇. 15% two 5 ◦. 15/. And B 〇. 〇〇〇5~〇. 〇5%, the remainder consists of A1 and impurities. As 讣马杂4, Si is 〇·ι5% or less, and Cu is 〇〇5% 095143892 (sub-case) 15 201120223 or less, Mg is 0. 05% or less. 6. The method of manufacturing a battery cover according to claim 5, wherein the explosion-proof portion is press-formed and is not annealed. 095143892(子案) 16