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Manufacturing method of battery separator, and wound product of battery separator

A manufacturing method and separator technology, which can be used in the manufacture of final products, battery pack components, sustainable manufacturing/processing, etc., and can solve the problems that hinder the high capacity, increase, and high cost of batteries.

Active Publication Date: 2018-11-06
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the other hand, especially when the porous layer is provided on the polyolefin microporous membrane after lengthening to produce a battery separator, if the thickness of the porous layer varies greatly with respect to the longitudinal direction (such as a part of the porous layer is larger than the thin case), in order to sufficiently ensure the function of the porous layer, the average thickness needs to be 1.5 times to 2 times the required minimum thickness, which becomes a major factor leading to high cost
In addition, since the thickness of the separator becomes thicker, the number of windings of the electrode winding is reduced, which is a major factor hindering the increase in battery capacity.
Furthermore, the lengthening of the battery separator will increase its diameter when it is used as a roll, and it is easy to cause winding deviation, etc., which will have a negative impact on the winding state of the roll. If the thickness of the porous layer varies is larger, the effect will be more significant

Method used

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  • Manufacturing method of battery separator, and wound product of battery separator
  • Manufacturing method of battery separator, and wound product of battery separator
  • Manufacturing method of battery separator, and wound product of battery separator

Examples

Experimental program
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Effect test

reference example 1

[0121] Mix polyvinyl alcohol (average degree of polymerization 1700, degree of saponification over 99%), alumina particles with an average particle size of 0.5 μm, and ion-exchanged water in a weight ratio of 6:54:40 and stir well to make it uniform dispersion. Next, filtration was performed using a filter with a filtration limit of 5 μm to obtain a coating liquid (a).

reference example 2

[0123]A copolymer of polyvinyl alcohol, acrylic acid, and methyl methacrylate "POVACOA" (registered trademark) (manufactured by Nisshin Chemical Co., Ltd.), alumina particles with an average particle size of 0.5 μm, and a solvent (ion-exchanged water : ethanol = 70: 30) respectively in a weight ratio of 5: 45: 50 and fully stirred to make it evenly dispersed. Next, filtration was performed using a filter with a filtration limit of 5 μm to obtain a coating liquid (b).

reference example 3

[0125] Water-based emulsion of polyvinylidene fluoride resin (VINYCOATPVDF AQ360 manufactured by East Nippon Paint Co., Ltd.), alumina particles with an average particle size of 0.5 μm, and ion-exchanged water were mixed in a weight ratio of 30:30:40, respectively. Proportion to mix and stir well to make it evenly dispersed. Next, filtration was performed using a filter with a filtration limit of 5 μm to obtain a coating liquid (c).

[0126] (Manufacture of battery separators)

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PUM

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Abstract

The present invention relates to a method for producing a battery separator which is uniform on both surfaces of a polyolefin microporous membrane and has fewer flaws and coating spots at low cost. A method for manufacturing a battery separator, comprising: a coating step of coating a coating solution comprising a water-soluble resin or a water-dispersible resin and inorganic particles on both sides of a polyolefin microporous membrane by a coating device; And the process of conveying the coated polyolefin microporous membrane output from the coating device to the vertical drying device arranged above the coating device without passing through the supporting device, and drying the vertical drying device, wherein, In the above coating process, the runout accuracy of the coating roller of the coating device is 10 μm / Φ100 mm or less, and the thickness of the coating line between the coating roller and the polyolefin microporous membrane is 3 mm to 10 mm.

Description

technical field [0001] The present invention relates to a method for producing a battery separator having porous layers on both surfaces of a polyolefin microporous membrane, and a wound product of the battery separator. Background technique [0002] Microporous membranes mainly containing thermoplastic resins are widely used as separation membranes, selectively permeable membranes, separator membranes, and the like for substances. For example, various filters such as battery separators used in lithium-ion secondary batteries, nickel-hydrogen batteries, nickel-cadmium batteries, or polymer batteries, separators for electric double-layer capacitors, reverse osmosis filtration membranes, ultrafiltration membranes, and microfiltration membranes , waterproof and moisture-permeable fabrics, medical materials, etc. [0003] In particular, as a separator for a lithium-ion secondary battery, a polyolefin microporous membrane is suitably used, which has ion permeability by being imp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/14
CPCH01M50/403Y02E60/10Y02P70/50
Inventor 水野直树
Owner TORAY IND INC
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