Battery case packaging material for cold molding comprising biaxially-stretched polybutylene terephthalate film

A technology of polybutylene terephthalate and biaxial stretching, which is applied in the field of battery packaging materials, can solve the problems of pinholes or cracks, uneven deformation of aluminum foil, etc., achieve stable formability, and inhibit the breakage of aluminum foil or pinholes, the effect of ensuring formability

Active Publication Date: 2013-07-24
KOHJIN FILM & CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In the laminate type battery outer packaging materials, the cold-formed laminate structure is generally a substrate layer, a barrier layer, and a sealing layer from the outside, or a substrate layer, a barrier layer, a barrier material reinforcement layer, and a sealing layer, but Aluminum foil, which is mainly used as a barrier layer, has the disadvantage of being prone to pinholes or cracks due to uneven deformation during forming

Method used

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  • Battery case packaging material for cold molding comprising biaxially-stretched polybutylene terephthalate film
  • Battery case packaging material for cold molding comprising biaxially-stretched polybutylene terephthalate film
  • Battery case packaging material for cold molding comprising biaxially-stretched polybutylene terephthalate film

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preparation example Construction

[0031] (Preparation method of PBT unstretched film before stretching)

[0032]In order to stably biaxially stretch the PBT resin, it is necessary to suppress the crystallization of the unstretched film before stretching as much as possible. The crystallization temperature range of the polymer, that is, the cooling rate of the film before stretching is an important factor. The cooling rate of the film before stretching is above 200°C / sec, preferably above 250°C / sec, especially preferably above 350°C / sec. Crystalline state, so the stability of bubbles rises rapidly when stretched. Furthermore, since film formation can be performed at high speed, productivity is also improved. When the cooling rate is less than 200°C / sec, not only the crystallinity of the obtained unstretched film before stretching becomes high, but also the stretchability decreases, and in extreme cases, the stretching bubbles are broken, and the stretching cannot be continued. Any method that satisfies the c...

Embodiment 1

[0045] (Manufacturing method of biaxially oriented PBT film)

[0046] Put PBT resin particles (homogeneous type, melting point 224°C, IV value 1.26dl / g) dried at 140°C for 5 hours by a hot air dryer in the extruder, and the cylinder and mold temperature is 210~ Melt and knead at 260°C, and extrude a molten tubular film downward from a ring die. Then, after cooling the outer diameter of the mandrel, the film was stretched at a speed of 1.2 m / min by stretching kneading rolls after being folded by Karabusa rolls. The temperature of the cooling water in direct contact with the molten tubular film was 20° C. on the inside and outside, and the cooling rate of the film before stretching was 416° C. / sec. The unstretched film had a thickness of 130 μm and a folded diameter of 143 mm before stretching, and 1000 ppm of magnesium stearate as a lubricant was previously added to the PBT resin. Under the above-mentioned conditions, the unstretched and stretched film 1 of film formation is ...

Embodiment 2～3、 comparative example 1～2

[0059] Except that the stretch ratio in Example 1 was changed to the conditions recorded in Table 1, the rest were the same as in Example 1.

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Abstract

To provide a battery case packaging material for cold molding, in which a biaxially-stretched polybutylene terephthalate film is used as a base layer and / or a barrier material reinforcing layer, whereby it becomes possible to produce a packaging material for cold molding, particularly a packaging material for a battery such as a lithium ion secondary battery, which contains a biaxially-stretched polybutylene terephthalate film that does not lose acid resistance or moisture-proof properties and maintains excellent cold-moldability, and therefore has excellent moisture-proof properties, acid resistance and cold moldability. A battery case packaging material for cold molding, comprising a base layer, a barrier layer and a sealant layer laminated in this order, or comprising a base layer, a barrier layer, a barrier material reinforcing layer and a sealant layer laminated in this order, wherein a biaxially-stretched polybutylene terephthalate film is used as the base layer and / or the barrier material reinforcing layer.

Description

technical field [0001] The invention relates to a cold-formed packaging material containing a biaxially oriented polybutylene terephthalate film excellent in moisture resistance, acid resistance and cold formability, in particular to a packaging material for batteries such as lithium-ion secondary batteries. Background technique [0002] In the past, various batteries including lithium-ion batteries, lithium-ion polymer batteries, fuel cells, etc., or elements that convert chemical energy into electrical energy, such as electrolytic capacitors, have been widely used in personal computers, mobile terminal equipment (mobile phones, PDAs) etc.), cameras, automobiles, energy storage secondary batteries, robots, satellites, etc. The above-mentioned electrolytic capacitors are liquid capacitors, solid capacitors, electric double-layer capacitors, etc. that contain a dielectric such as liquid, solid ceramics, or organic matter. As an outer packaging material for these batteries, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/02B29C55/16B32B27/36B29K67/00B29L7/00H01M50/119H01M50/121H01M50/129H01M50/131H01M50/133H01M50/136H01M50/14
CPCB29C55/28Y02E60/12H01M2/0282H01M10/0525B29K2067/006H01M2/0292H01M2/029Y02T10/7011H01M2/0287H01M2/028B32B27/36H01M2/0275B32B15/08B32B15/18B32B15/20B32B27/205B32B27/32B32B2307/306B32B2307/308B32B2307/518B32B2307/54B32B2307/706B32B2307/718B32B2457/00B32B2553/00Y10T428/31786Y02E60/10H01M50/124H01M50/1245H01M50/133H01M50/121H01M50/14H01M50/129H01M50/136H01M50/119H01M50/131B29C55/16
Inventor 永江修一浜田和宏本田翼村上武典
Owner KOHJIN FILM & CHEM
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