Secondary battery, method for producing the same, and thermally adhesive insulating film for secondary battery

A secondary battery, thermal bonding technology, applied in the direction of secondary battery, electrolyte storage battery manufacturing, electrode manufacturing, etc., can solve the problems of foreign matter in the battery and affect the performance of the battery, so as to prevent peeling, increase the exposed area, and improve the durability receptive effect

Active Publication Date: 2016-01-20
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 producing the same, and thermally adhesive insulating film for secondary battery
  • Secondary battery, method for producing the same, and thermally adhesive insulating film for secondary battery
  • Secondary battery, method for producing the same, and thermally adhesive insulating film for secondary battery

Examples

Experimental program
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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 produced 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 a slight tendency to fuse to the weather strip was observed. 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, 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 undergo 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 present invention relates to a secondary battery, which is characterized in that the secondary battery is obtained by accommodating an electrode body in which a positive electrode member, a separator and a negative electrode member are stacked in this order, and the positive electrode member and the negative electrode member are respectively composed of The current collector and the active material layer formed to cover one end side of the current collector are made, and the insulator made of an insulating material that does not show adhesion at room temperature is attached with an adhesive force of 1N / 15mm or more Attached to the current collector constituting the positive electrode member or the negative electrode member, the periphery of the positive electrode member or the negative electrode member has a section including the current collector and the insulator. In addition, the present invention relates to a heat-adhesive insulating film for secondary batteries, characterized in that it has a base material layer made of polyolefin and a polyolefin modified with unsaturated carboxylic acid or its derivatives. formed adhesive layer. The present invention provides a secondary battery capable of effectively preventing foreign matter from being mixed into the battery while preventing swelling and peeling of electrode portions, a method for producing the same, and a thermally adhesive insulating film for the secondary battery.

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 Patents(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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