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Film wound body

A film winding body and diaphragm technology, which is applied in the direction of structural parts, final product manufacturing, battery pack parts, etc., can solve the problems of insufficient manufacturing cost, and achieve the effect of high-efficiency manufacturing and small slack

Inactive Publication Date: 2020-03-06
UBE IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, it is necessary to introduce a special metal roller, so it is insufficient from the aspect of manufacturing cost

Method used

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  • Film wound body
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Examples

Experimental program
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Embodiment

[0110] Hereinafter, specific examples of the present invention will be described. The present invention is not limited to these Examples.

[0111] In order to form the layer structure of the porous membrane (separator) shown in Table 1, the raw films unwound from the raw material rolls (film rolls) shown in Table 1 are laminated and thermocompression bonded (laminated), A laminated film is obtained. Next, the obtained laminated film is heat-treated at a temperature ranging from 110°C to 150°C.

[0112] Next, in the cold stretching zone, the heat-treated base film or laminated film is uniaxially stretched at a temperature of 20°C to 40°C at a ratio of 5% to 100% (low temperature stretching).

[0113] Next, the laminated film after low-temperature stretching is uniaxially stretched (high-temperature stretching) at a temperature of 80° C. to 145° C. and a ratio of 100% to 400% in a hot stretching zone.

[0114] Thereafter, heat treatment is performed at a temperature 5° C. to ...

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Abstract

A film wound body 10 which is composed of a cylindrical core 1 and a polyolefin microporous film 2 that is wound around the core 1 and is used as a separator for electricity storage devices. This filmwound body 10 has a difference DELTA R between the maximum outer diameter D1 and the minimum outer diameter D2 in the width direction of 0.05-1.2 mm.

Description

technical field [0001] The present invention relates to a film roll. [0002] This application claims priority based on Japanese Patent Application No. 2017-130572 filed in Japan on July 3, 2017, and uses the content thereof here. Background technique [0003] In recent years, power storage devices such as lithium secondary batteries have been widely used for power storage in small electronic devices such as mobile phones and notebook personal computers, electric vehicles, and the like. A lithium secondary battery has a positive electrode, a negative electrode, a separator interposed between the positive electrode and the negative electrode, and a non-aqueous electrolytic solution composed of a lithium salt and a non-aqueous solvent. [0004] Conventionally, there are film rolls described in Patent Document 1 and Patent Document 2 as film rolls used for separators of lithium secondary batteries. [0005] Patent Document 1 discloses a method for producing a porous polypropy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M50/417H01M50/489H01M50/491
CPCH01M10/0587H01M10/0525H01M2300/0085Y02E60/10Y02P70/50H01M50/417H01M50/491H01M50/489H01M50/44
Inventor 南云广树鹈山真治角田刚久
Owner UBE IND LTD