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Pouch case for secondary battery and pouch type secondary battery comprising same

A secondary battery, pouch type technology, applied in the direction of secondary batteries, lithium batteries, battery pack components, etc., can solve the problems of reducing the service life of secondary batteries, accelerating battery deterioration and gas generation, reducing volume, etc. The effect of reliability and yield

Active Publication Date: 2017-12-05
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Compared to pouch-type lithium secondary batteries, prismatic lithium secondary batteries are good for protecting the electrode assembly from external shocks and have a simple electrolyte injection process, but have disadvantages in reducing volume due to their fixed shape
Therefore, electronic products using such a prismatic lithium secondary battery as a power source have a disadvantage in that their design is limited
In addition, in terms of safety, the prismatic lithium secondary battery has the following disadvantages: it does not have a smooth discharge effect to release gas or liquid, and therefore has a high risk of explosion as internal heat or gas accumulates, and due to failure to Overheating caused by the released heat causes battery degradation in a short time interval
However, unlike a prismatic secondary battery, a pouch-type secondary battery uses a soft pouch having a small thickness as a case container, and therefore, the pouch-type secondary battery has disadvantages of weak physical and mechanical strength and low sealing reliability sex
[0012] When moisture penetrates into the secondary battery, corrosion of the electrode assembly, tabs, and case (metal layer) is accelerated, while hydrogen fluoride is separated from fluoride due to moisture, and battery performance may deteriorate
In addition, various side reactions caused by moisture accelerate battery deterioration and gas generation, which may lead to reduced life and explosion of secondary batteries

Method used

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  • Pouch case for secondary battery and pouch type secondary battery comprising same
  • Pouch case for secondary battery and pouch type secondary battery comprising same
  • Pouch case for secondary battery and pouch type secondary battery comprising same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0089] (Preparation of inner resin layer)

[0090] The thermosetting hygroscopic agent carboxymethylcellulose was ground for 20 minutes using a shear breaking device rotating at 3000 rpm to prepare carboxymethylcellulose powder (average particle diameter: 1 μm).

[0091] Subsequently, carboxymethylcellulose powder (3% by weight) was dispersed in a polypropylene resin solution, and the resultant was extruded at about 220° C. to prepare an inner resin layer having a thickness of 40 μm.

[0092] (Preparation of pouch shell tablets)

[0093] A norbornene resin having a thickness of 60 μm was laminated on the inner resin layer to prepare an intermediate resin layer.

[0094] Next, an outer resin layer composed of 15 μm-thick nylon was laminated on the intermediate resin layer to manufacture a pouch-type case for a secondary battery.

Embodiment 2

[0096] (Preparation of inner resin layer)

[0097] The acrylic acid-acrylamide copolymer was ground by rotating at 3000 rpm for 20 minutes using a shear fracture apparatus to prepare an acrylic acid-acrylamide copolymer powder (average particle diameter: 1 μm).

[0098] Subsequently, acrylic acid-acrylamide copolymer powder (5% by weight) was dispersed in a polypropylene resin solution, and the resultant was extruded at about 220° C., thereby preparing an inner resin layer having a thickness of 40 μm.

[0099] (Preparation of pouch shell tablets)

[0100] A norbornene resin having a thickness of 60 μm was laminated on the inner resin layer to form an intermediate resin layer.

[0101] Next, an outer resin layer composed of 15 μm-thick nylon was laminated on the intermediate resin layer to manufacture a pouch-type case for a secondary battery.

Embodiment 3

[0103] The ethylene-maleic anhydride copolymer was ground by rotating at 3000 rpm for 20 minutes using a shear fracture apparatus to prepare ethylene-maleic anhydride copolymer powder (average particle diameter: 1 μm).

[0104] Subsequently, ethylene-maleic anhydride copolymer powder (1% by weight) was dispersed in a polypropylene and acrylic acid copolymer resin solution, and the resultant was extruded and released at about 220° C., thereby preparing an interior having a thickness of 40 μm. resin layer.

[0105] (Preparation of pouch shell tablets)

[0106] A norbornene resin having a thickness of 60 μm was laminated on the inner resin layer to prepare an intermediate resin layer.

[0107] Next, an outer resin layer formed of 15 μm-thick nylon was laminated on the intermediate resin layer to manufacture a pouch-type case for a secondary battery.

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Abstract

The present invention relates to a pouch case for a secondary battery and a secondary battery comprising the same and, specifically, to a pouch case for a secondary battery, manufactured by stacking an inner resin layer, a middle resin layer, and an outer resin layer, wherein the inner resin layer comprises a polyolefin based resin and a thermosetting moisture absorber, and to a secondary battery comprising the same.

Description

technical field [0001] Cross-references with related applications [0002] This application claims priority and benefit from Korean Patent Application No. 10-2015-0045310 filed with the Korean Intellectual Property Office on March 31, 2015, the entire contents of which are hereby incorporated by reference. technical field [0003] The present disclosure relates to a pouch-type case and a pouch-type secondary battery including the same, and in particular, to a pouch-type secondary battery provided with a moisture sensing function and including an inner resin layer / intermediate resin layer / outer resin layer A pouch-type case and a pouch-type secondary battery including the pouch-type case. Background technique [0004] With technological development and increased demand for mobile devices, demand for secondary batteries as energy sources is rapidly increasing, and thus, research into secondary batteries capable of responding to various demands has been conducted. [0005...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/02H01M10/052B32B27/08B32B27/32B32B27/20B32B1/00H01M50/121H01M50/129H01M50/133
CPCB32B27/08B32B27/20B32B27/32H01M10/052H01M50/124H01M50/129H01M50/121H01M50/133B32B2250/24B32B2323/00B32B2250/03B32B2250/242B32B3/02B32B7/12B32B15/085B32B15/09B32B15/088B32B27/34B32B27/36B32B2307/732B32B2439/62Y02E60/10B32B1/00B32B27/18B32B2457/10H01M10/0525
Inventor 庾亨均金橡熏黄源弼黄随枝郑湘锡
Owner LG ENERGY SOLUTION LTD
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