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Manufacturing method and manufacturing apparatus of separator for lithium ion secondary battery

A technology for secondary batteries and manufacturing methods, which can be applied to secondary batteries, lamination devices, and final product manufacturing, and can solve problems such as difficulty in securing work space and short distance between rollers

Active Publication Date: 2021-03-16
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, in the above-mentioned prior art, the distance between the adjacent conveying rollers constituting the conveying system is short, so there is a problem that it is difficult to secure a working space for the work required to manufacture the laminated porous membrane.

Method used

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  • Manufacturing method and manufacturing apparatus of separator for lithium ion secondary battery
  • Manufacturing method and manufacturing apparatus of separator for lithium ion secondary battery
  • Manufacturing method and manufacturing apparatus of separator for lithium ion secondary battery

Examples

Experimental program
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Effect test

Embodiment approach 1

[0046] Hereinafter, the lithium ion secondary battery, battery separator, heat-resistant separator, heat-resistant separator manufacturing method, slitting device, and cutting device of Embodiment 1 will be described in order.

[0047]

[0048] Nonaqueous electrolyte secondary batteries represented by lithium ion secondary batteries have high energy density. Therefore, the above-mentioned lithium ion secondary batteries are currently widely used as batteries used in equipment such as personal computers, mobile phones, and portable information terminals, and mobile bodies such as automobiles and aircrafts. Furthermore, the above-mentioned lithium ion secondary battery is also widely used as a stationary battery that contributes to the stable supply of electric power.

[0049] figure 1 It is a schematic diagram showing the cross-sectional structure of the lithium ion secondary battery 1 . Such as figure 1 As shown, the lithium ion secondary battery 1 includes a cathode 11 ,...

Embodiment approach 2

[0109]

[0110] Figure 11 It is a schematic diagram which shows the structure of the drying apparatus 21a. The drying device 21a makes the separator coil 12b coated with the coating liquid on the separator coil 12c to form the heat-resistant layer 4, or the wet state of the separator coil 12c coated with the coating liquid and not undergoing the precipitation process. The membrane web 12b is dried.

[0111] The drying device 21a includes a drying furnace 41 inside, and has a plurality of conveyance rollers R8 that contact the other surface of the separator coil 12b coated with the coating liquid on one surface to convey the separator coil 12b. An expansion roll E8 that expands the separator web 12b dried in the drying oven 41 so as to prevent wrinkles; and a conveyance roll H8 that is arranged immediately before the expansion roll E8. The distance between the spreading roll E8 and the conveyance roll H8 is not less than 1 m and not more than 10 m. Thereby, it is possible...

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Abstract

The present invention relates to a method for producing a battery separator and an apparatus for producing a battery separator. The conveyance system includes an expansion roll for removing wrinkles from the diaphragm web, and the distance between the expansion roll and the conveyance roll immediately before or after the expansion roll is 1 m or more and 10 m or less.

Description

technical field [0001] The present invention relates to a method for manufacturing a battery separator and a device for manufacturing a battery separator. Background technique [0002] There is known a method for producing a coating-type separator (laminated porous membrane) in which a strip-shaped porous membrane is conveyed by a conveyance system including a plurality of conveyance rollers, and a coating liquid is applied to the porous membrane during the conveyance (patent Literature 1). [0003] Patent Document 1 discloses that when the distance between two adjacent conveyance rollers in the conveyance direction of the battery separator (hereinafter also referred to as "roller pitch") is long, the conveyance of the battery separator Wrinkles are likely to occur in the battery separator on the conveying rollers on the downstream side in the direction. Therefore, it is preferable that the distance between adjacent conveying rollers constituting the conveying system is 1 m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M50/403H01M50/417H01M50/449H01M50/423
CPCH01M50/403H01M50/449H01M50/423H01M50/417H01M10/0525Y02E60/10B32B27/08B32B27/32B32B37/0053B32B2457/10Y02P70/50H01M50/491B32B7/12B32B37/025B32B37/12B32B37/203B32B2305/026B32B2323/04B32B2323/10B32B2375/00
Inventor 上岛陆里进章彦
Owner SUMITOMO CHEM CO LTD