Secondary battery, method for manufacturing same, and thermal adhesive insulating film for secondary battery

A secondary battery and insulating film technology, which is applied in secondary battery, electrolyte battery manufacturing, electrode manufacturing, etc., can solve the problems of affecting battery performance and foreign matter in the battery, so as to increase the exposed area, prevent peeling, and improve tolerance sexual effect

Active Publication Date: 2013-07-03
TORAY ADVANCED FILM CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, in the case of sticking and using the existing insulating tape, if the insulating tape is attached and the electrode is cut with a cutter or the like for molding, the adhesive of the insulating tape adheres to the blade of the cutter, and there is a problem. Disadvantages that the attached adhesive itself or the surrounding garbage mixed with the adhesive will make the battery mixed with foreign matter and affect the performance of the battery

Method used

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  • Secondary battery, method for manufacturing same, and thermal adhesive insulating film for secondary battery
  • Secondary battery, method for manufacturing same, and thermal adhesive insulating film for secondary battery
  • Secondary battery, method for manufacturing same, and thermal adhesive insulating film for secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] according to image 3 In the manufacturing process shown, a lithium-ion secondary battery is produced by using rolled aluminum foil for the positive electrode collector foil and electrolytic copper foil for the negative electrode collector foil. For the positive active material, LiMn as the transition metal lithium acid 2 o 4 The main component is polyvinylidene fluoride (PVDF) as a binder, the positive electrode active material is coated on an aluminum foil, dried, and formed by roll pressing. For the negative electrode active material, graphite is used as the main component, polyvinylidene fluoride is used as the binder, the negative electrode active material is coated on the electrolytic copper foil, dried, and formed by roll pressing. The electrolyte uses a mixture of diethyl carbonate and ethylene carbonate as the solvent and dissolves the electrolyte salt LiPF 6 the resulting liquid. In addition, the portion to which the insulating film was bonded on the alumi...

Embodiment 2

[0050] A lithium-ion secondary battery was manufactured under the same conditions as in Example 1 except that the base layer of the insulating film was changed to block PP whose melting point measured by DSC was 161° C., and the results are listed in Table 1. In addition, the secondary battery obtained under this condition also had sufficient adhesive force to the aluminum foil, and there was no peeling at the time of dicing or degradation of battery performance, but there was a slight tendency to fuse to the weather strip. In addition, this insulating film did not exhibit adhesiveness at normal temperature, and the insulating film also did not exhibit adhesiveness at ordinary temperature in Examples 3 to 9 and Comparative Example 1 shown below.

Embodiment 3

[0052] The adhesive layer of the insulating film was changed to a modified resin with a melting point of 161° C. as measured by DSC, that is, MODIC (registered trademark) P555 ​​manufactured by Mitsubishi Chemical Corporation, and a lithium-ion battery was produced under the same conditions as in Example 1. batteries, and the results are listed in Table 1. In addition, the secondary battery obtained under these conditions did not suffer from peeling at the time of dicing or fusion with the weather strip, and the battery performance did not decrease, but the adhesive force with the aluminum foil tended to be slightly low.

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Abstract

The secondary battery of the present invention accommodates in an outer housing an electrode body in which a positive electrode member, separator member, and negative electrode member are laminated in this order. The secondary battery is characterized by the positive electrode member and the negative electrode member each being formed from a collector and an active material layer formed so as to cover one end on the collector. The secondary battery is further characterized by an insulating body in which the insulating material does not exhibit adhesiveness at normal temperatures being applied with an adhesive force of 1 N/15 mm or greater onto the collector constituted of the positive electrode member or negative electrode member, and the peripheral edge of the positive electrode member or negative electrode member having a cross-sectional surface containing the collector and insulating body. In addition, the thermal adhesive insulating film for a secondary battery of the present invention is characterized by having a base material layer formed from a polyolefin and an adhesive layer formed from a polyolefin modified using unsaturated carboxylic acid or a derivative thereof. A secondary battery, a method for manufacturing the same, and a thermal adhesive insulating film for a secondary battery that prevent swelling and peeling of the electrode parts and effectively prevent mixing in of foreign matter inside the battery are provided.

Description

technical field [0001] The present invention relates to a secondary battery, and more specifically, to a secondary battery excellent in preventing short circuit between electrodes, a method for producing the same, and a thermally adhesive insulating film for the secondary battery. Background technique [0002] Secondary batteries such as lithium-ion secondary batteries are widely used and their capacity has been increased. As a result, higher reliability is required for safety. Therefore, Patent Document 1 describes that by arranging an insulating film that does not have ion permeability on the portion of the positive electrode current collector foil where the uncoated portion faces the negative electrode active material coated portion, even if the lithium ion secondary battery is repeatedly charged and discharged , It can also suppress the insertion of the ionic liquid as the electrolyte into the negative electrode active material, and can prevent the expansion and peeling ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058H01M2/30H01M2/34H01M4/13H01M4/139H01M10/052H01M10/0566H01M50/186H01M50/193H01M50/197H01M50/417
CPCH01M4/0404H01M4/13H01M4/139H01M10/052H01M10/0566H01M10/058H01M4/667H01M4/668Y10T29/49115Y02P70/50Y02E60/10H01M50/417H01M50/186H01M50/193H01M50/197H01M10/0525
Inventor 松浦洋一深贝佳孝山田聪大上悦夫冈野贤市川智之
Owner TORAY ADVANCED FILM CO LTD
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