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Three-piece square can and method of manufacturing the same

a three-piece square and rectangular technology, applied in the direction of cell components, cell components, jackets/case materials, etc., can solve the problems of reducing the sealing property at the side seam of the can body, affecting the rigidity of the bottom side of the can, and affecting the operation of the can. , to achieve the effect of increasing the rigidity of the can wall, enhancing the radiation of heat, and increasing the surface area

Inactive Publication Date: 2009-08-20
TOYO SEIKAN KAISHA LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention relates to a three-piece rectangular can that has excellent liquid leakage resistance and prevents corrosion caused by a defect in the resin coating film. The can is formed by applying a necking forming to opening portions at both ends of a rectangular can body having no seam on the side surface thereof, and seaming the top and bottom lids to the opening portions. The can body is formed by deforming a bottomed circular can and the opening portions have the opening portions. The three-piece rectangular can has no seam on the side surface thereof, making it easy to manufacture and preventing shortening of battery lifespan and deterioration of the adhesiveness of the resin film to the can body. The can also has beads formed on the can body to increase rigidity and enhance heat radiation. The three-piece rectangular can also has electrodes mounted in the through holes of the top and bottom lids, ensuring insulation between the electrodes and the can body.

Problems solved by technology

The three-piece can has the side seam in the can body and the joint portions with the lids and hence, there exists a drawback that a leakage of contents attributed to a joint defect is liable to occur.
However, the technique has a drawback that the sealing property at the side seam of the can body is liable to be easily decreased due to the formation of the beads.
In the two-piece can, the top lid is mounted on only the opening portion which is formed by drawing and hence, a shape of a can bottom side formed by drawing is limited by restrictions attributed to conditions such as mold designing or a material for drawing whereby the enhancement of the rigidity of the can bottom side is also limited.

Method used

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  • Three-piece square can and method of manufacturing the same
  • Three-piece square can and method of manufacturing the same
  • Three-piece square can and method of manufacturing the same

Examples

Experimental program
Comparison scheme
Effect test

embodiment 1

[0147]A substrate is formed by applying a chromic phosphoric treatment with an amount of chromium of 20 mg / m2 in metal chromium conversion to a surface of an aluminum plate (3003-H14) having a plate thickness of 0.5 mm and having the composition consisting of 1.1 weight % of Mn, 0.19 weight % of Cu, 0.30 weight % of Si, 0.43 weight % of Fe and a balance of Al.

[0148]To one surface of the substrate, a biaxially stretched film (thickness: 30 μm) formed of a polyethylene terephthalate / iso phthalate (PET / I) for copolymer resin containing 10 molecular % of isophthalic acid as a copolymer content is laminated at a temperature of 245° C. thus manufacturing a resin-coated aluminum plate. This film has a melting point of 240° C. and exhibits an X-ray diffraction intensity ratio IA / IB of 5.0.

[0149]The resin coated aluminum plate obtained by the above-mentioned manner is blanked into a circular blank and, thereafter, drawing forming is applied to the circular blank. After trimming lug portion a...

embodiment 2

[0150]This embodiment 2 is substantially equal to the embodiment 1 except for that a biaxially stretched film (thickness: 30 μm) which has a melting point different from the melting point of the biaxially stretched film used in the embodiment 1 is laminated to the surface of the substrate used in the embodiment 1 at a temperature of 230° C. A film formed by this embodiment 2 has a melting point of 230° C. and an X-ray diffraction intensity ratio of IA / IB is 4.0.

embodiment 3

[0151]This embodiment 3 is substantially equal to the embodiment 1 except for that a biaxially stretched film (thickness: 30 μm) which has a melting point different from the melting point of the biaxially stretched film used in the embodiment 1 is laminated to the surface of the substrate used in the embodiment 1 at a temperature of 235° C. A film formed by this embodiment 3 has a melting point of 230° C. and an X-ray diffraction intensity ratio of IA / IB is 3.5.

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Abstract

The present invention provides a three-piece rectangular can which can overcome drawbacks (joint defect) of a can body joint portion of a three-piece can, and is of a new type which overcomes shortage of a can body strength which a two-piece can possesses, and exhibits excellent liquid leakage resistance, excellent can body strength and excellent heat radiation property or the like even when the can is used as a casing of a battery or electric equipment. For this end, the three-piece rectangular can of the present invention is formed such that a circular blank formed of an aluminum plate which forms an organic film on at least one surface thereof is formed into a bottomed circular can by deep drawing such that the organic film forms an inner side of the can, a cylindrical sleeve having no seam on a side surface thereof is formed by cutting a can bottom of the bottomed circular can, a rectangular can body portion having no seam on a side surface thereof is formed by deforming the cylindrical sleeve into a rectangular shape, a necking formed portion is formed by applying necking forming to opening portions at both ends of the rectangular can body, and a top lid and a bottom lid are mounted on the opening portions at both ends of the rectangular can body by double seaming by way of an organic compound.

Description

FIELD OF THE INVENTION[0001]The present invention relates to a new type of rectangular can which can eliminate a joint defect at a joint portion of a can body and has an excellent strength and, more particularly to a three-piece rectangular can which is applicable to a battery casing and various kinds of casings for electrical equipment and a manufacturing method thereof.BACKGROUND OF THE INVENTION[0002]Recently, along with progress in electric technology, the development of high performance, the miniaturization, the realization of high energy and the improvement on portable structure of electronic equipment, and the realization of high performance of an electrically driven automobile (for example, a so-called hybrid vehicle) have advanced. Accordingly, casings for various kinds of batteries which are used as power sources for driving the electronic apparatus and the electrically driven car, particularly, casings for electric double-layered capacitors have been required to exhibit a...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B65D6/28B21D22/00B21D3/02H01M50/103H01M50/119H01M50/121H01M50/124H01M50/133H01M50/145
CPCB21D51/2638B21D51/2646B21D51/2653B65D7/06B65D7/36H01M10/0404H01M2/0202H01M2/0272H01M2/0275H01M2/0277H01M2/0426B65D7/40Y02E60/10H01M50/1243H01M50/169H01M50/133H01M50/103H01M50/121H01M50/124H01M50/145H01M50/119B21D51/26B21D41/04
Inventor HIROTSU, MUNEMITSUKANEDA, SHINICHISHIRANE, ZENROUOOHORI, KEITODA, HITOSHIISHII, MASAYUKIYASUDA, NORIFUMIKATOH, HISASHIIWAIDA, MANABUYAMAMOTO, KOICHIMORI, SHIGEAKIYAMAGAMI, TAKESHIOYAMA, SHIGEKI
Owner TOYO SEIKAN KAISHA LTD
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