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Separator for battery, battery using same and method for producing battery

一种隔膜、电池的技术，应用在隔膜的改良领域，能够解决漏电的制品不良、隔膜表面滑动性低、隔膜损伤等问题，达到降低摩擦的效果

Active Publication Date: 2012-02-01
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006]However, if the slipperiness of the diaphragm surface is low, the friction between the diaphragm surface and the winding core becomes large, and when the winding core is pulled out, the diaphragm and the winding core Withdrawn from the electrode set, or the diaphragm is damaged
In addition, the dislocation or damage of the diaphragm is related to the defective product caused by the leakage of the current

Method used

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  • Separator for battery, battery using same and method for producing battery
  • Separator for battery, battery using same and method for producing battery
  • Separator for battery, battery using same and method for producing battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0117] make figure 1 Shown is a cylindrical lithium ion secondary battery (battery A) equipped with a wound electrode group. The battery is a 18650 type with a diameter of 18.1mm and a height of 65.0mm, and a nominal capacity of 2600mAh. As the battery case 1 , a metal case (diameter: 17.8 mm, overall height: 64.8 mm) obtained by press-forming a nickel-plated steel sheet (wall thickness: 0.20 mm) was used.

[0118] The non-aqueous electrolyte was prepared as follows: LiPF was dissolved at a concentration of 1.0M in a mixed solvent of ethylene carbonate and ethyl methyl carbonate (volume ratio 2:1) 6 , and prepared by adding cyclohexylbenzene at a concentration of 0.5% by weight.

[0119] In addition, the wound electrode group was produced as follows (1) to (4).

[0120] (1) Fabrication of diaphragm

[0121] form figure 2 A separator 7 having a three-layer structure (20 μm in thickness) having a porous polyethylene layer 7 a as an inner layer and a pair of porous polyprop...

Embodiment 2 and comparative example 1

[0139] A separator having a three-layer structure was produced in the same manner as in Example 1, except that the porosity and pore diameter range on the surface of the porous polypropylene film were changed to the values ​​shown in Table 1. Except having used the obtained separator, it carried out similarly to Example 1, and produced 300 electrode groups for each example. Batteries B to L were produced using the remaining electrode group except for the electrode group in which the separator could not be fed out well by the roller during winding, and the winding misalignment occurred due to poor winding of the separator. In Table 1, the number of electrode groups in which winding defects occurred among the 300 electrode groups is represented by "defective winding".

[0140] In addition, the opening ratio and opening diameter range were adjusted by adjusting the stretching conditions of the porous polypropylene film. The thicknesses of the separators 7 were all set to 20 μm. ...

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Abstract

Disclosed is a separator for a battery comprising a porous polymer film having a first surface and a second surface that is located on the opposite side of said first surface, wherein openings interconnecting pores in the porous polymer film are distributed in the first surface and the ratio of the total area of the openings to the area of the first surface is 89-96% inclusive. The opening diameter may range from 0.8 to 40 [mu]m inclusive. It is preferred that a part with a definite thickness of the porous polymer film, at least on the first surface side, contains at least one component selected from the group consisting of polypropylene and copolymers of propylene with other copolymerizable monomer(s).

Description

technical field [0001] The present invention relates to a separator for a battery, a battery using the separator, and a method for manufacturing the battery, and particularly relates to an improvement of the separator. Background technique [0002] Demand for batteries with high capacity and high energy density represented by lithium-ion secondary batteries is increasing for various applications. However, when an excessive current flows into such a battery, the temperature of the battery may rise significantly. The development of batteries aiming at improving the safety during such abnormalities is being promoted. [0003] Typically, a battery has a positive electrode, a negative electrode, a separator and an electrolyte sandwiched between them. The separator generally has a porous structure because it is required to have a function of ensuring ion conductivity and electrically insulating between positive and negative electrodes. In addition, the separator may also be req...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M10/0587H01M50/414
CPCH01M10/0587H01M2/1653Y02E60/10Y02P70/50H01M50/414Y10T29/49115
Inventor 谷崎沙织里山本典博中桐康司柴野靖幸
Owner PANASONIC CORP
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