KR-102963317-B1 - PACKAGING MATERIAL FOR BATTERY AND SECONDARY BATTERY INCLUDING THE SAME

KR102963317B1KR 102963317 B1KR102963317 B1KR 102963317B1KR-102963317-B1

Abstract

A battery packaging material and a secondary battery including the same are provided. The battery packaging material includes an outer protective layer comprising a liquid crystal polymer, a sealant layer, and an adhesive layer bonding the outer protective layer and the sealant layer. A secondary battery having high capacity, chemical resistance, and mechanical reliability can be provided while omitting a metal layer.

Inventors

김도현
김연수
신성호

Assignees

동우 화인켐 주식회사

Dates

Publication Date: 20260508
Application Date: 20211230

Claims (12)

An outer protective layer comprising a liquid crystal polymer; sealant layer; and It includes an adhesive layer that bonds the outer protective layer and the sealant layer, The above-mentioned outer protective layer provides the outer surface of the battery, and the above-mentioned sealant layer is exposed on the inner side of the battery, and A battery packaging material in which the sealant layer, the adhesive layer, and the outer protective layer are sequentially laminated from the inside of the battery.
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A battery packaging material according to claim 1, wherein the outer protective layer is in direct contact with one side of the adhesive layer, and the sealant layer is in direct contact with the other side of the adhesive layer.
A battery packaging material according to claim 1, comprising the outer protective layer, the adhesive layer, and the sealant layer.
A battery packaging material according to claim 1, wherein the sealant layer is a single layer.
A battery packaging material according to claim 1, wherein the sealant layer has a multilayer structure.
A battery packaging material according to claim 1, wherein the thickness of the outer protective layer is smaller than the thickness of the sealant layer.
A battery packaging material according to claim 1, wherein the thickness of the adhesive layer is smaller than the thickness of the outer protective layer and the thickness of the sealant layer, respectively.
A battery packaging material according to claim 1, having a total thickness of 120 μm or less.
A battery packaging material according to claim 1, wherein the liquid crystal polymer comprises at least one of repeating units represented by the following chemical formulas 1 to 3: [Chemical Formula 1] -O-Ar 1 -CO- (In Chemical Formula 1, Ar 1 is 1,4-phenylene, 2,6-naphthalene, or 4,4'-biphenylene) [Chemical Formula 2] -CO-Ar 2 -CO- (In Chemical Formula 2, Ar 2 is 1,4-phenylene, 1,3-phenylene, or 2,6-naphthalene) [Chemical Formula 3] -X-Ar 3 -Y- (In Chemical Formula 3, X is NH, Y is O, NH, or C=O, and Ar 3 is 1,4-phenylene or 1,3-phenylene).
A battery packaging material according to claim 10, wherein the liquid crystal polymer comprises a repeating unit represented by Chemical Formula 1, a repeating unit represented by Chemical Formula 2, and a repeating unit represented by Chemical Formula 3.
Packaging material for batteries according to claim 1; and A secondary battery comprising an electrode assembly including a positive electrode and a negative electrode that are repeatedly stacked and accommodated within the above-mentioned battery packaging material.

Description

Packing material for battery and secondary battery including the same The present invention relates to a packaging material for batteries and a secondary battery including the same. More specifically, it relates to a packaging material for batteries including a resin laminate structure and a secondary battery including the same. Rechargeable batteries are batteries capable of repeated charging and discharging, and with the advancement of the information and communication and display industries, they are widely applied as power sources for portable electronic communication devices such as camcorders, mobile phones, and laptop PCs. Furthermore, recently, battery packs containing rechargeable batteries are being developed and applied as power sources for eco-friendly vehicles, such as hybrid cars. Examples of secondary batteries include lithium-ion batteries, nickel-cadmium batteries, and nickel-hydrogen batteries; among these, active research and development is being conducted on lithium-ion batteries due to their high operating voltage and energy density per unit weight, as well as their advantages in charging speed and weight reduction. For example, a lithium secondary battery may include an electrode assembly comprising a positive electrode, a negative electrode, and a separator, and an electrolyte impregnating the electrode assembly. The lithium secondary battery may further include an outer casing, for example, in the form of a pouch, that accommodates the electrode assembly and the electrolyte. The above exterior material is manufactured in the form of a multi-layer laminate to block moisture, air, etc. from penetrating into the electrode assembly. An aluminum foil is inserted inside the laminate, and a plurality of resin layers are laminated from the aluminum foil to the inner and outer sides of the secondary battery, respectively. For example, Korean Registered Patent Publication No. 10-2331528 discloses a secondary battery packaging material comprising an aluminum foil and a plurality of resin layers. Figure 1 is a schematic cross-sectional view showing a battery packaging material of a comparative example. FIG. 2 is a schematic cross-sectional view showing a battery packaging material according to exemplary embodiments. FIGS. 3 and FIGS. 4 are a schematic plan view and a cross-sectional view illustrating a secondary battery according to exemplary embodiments. Embodiments of the present invention provide a battery packaging material comprising a liquid crystal polymer layer and a sealant layer, and a battery comprising the same. Embodiments of the present invention will be described in more detail below with reference to the drawings. However, the following drawings attached to this specification are intended to illustrate preferred embodiments of the present invention and serve to further enhance understanding of the technical concept of the present invention together with the aforementioned description; therefore, the present invention should not be interpreted as being limited only to the matters described in such drawings. Terms used in this specification, such as "top surface," "bottom surface," "upper part," "lower part," "lower surface," and "lower part," are used in a relative sense to distinguish the locations of the components and do not specify absolute locations. Figure 1 is a schematic cross-sectional view showing a battery packaging material of a comparative example. Referring to FIG. 1, the battery packaging material of the comparative example may include a metal layer (50), a sealant layer (40) disposed on the bottom surface of the metal layer (50), and substrate layers (70, 90) disposed on the top surface of the metal layer (50). The bottom surface of the metal layer (50) faces the inside of the battery cell, and the top surface of the metal layer (50) may face the outside of the battery cell. The metal layer (50) can be provided as a barrier that provides moisture resistance, chemical resistance, and gas barrier properties for the battery packaging material. For example, the metal layer (50) can be made from a metal foil such as aluminum foil (Al foil). The sealant layer (40) may be a layer exposed on the inner side of the battery cell. The sealant layer (40) may be a portion that is melt-bonded by a sealing process including a fusion process after the electrode assembly is housed inside the battery packaging material. For example, the sealant layer (40) may include a polyolefin resin or a cyclic polyolefin resin. Examples of the polyolefin resin include polyethylene, polypropylene, a block copolymer of polypropylene (e.g., a block copolymer of propylene and ethylene), a random copolymer of polypropylene (e.g., a random copolymer of propylene and ethylene), a terpolymer of ethylene-butene-propylene, etc. The above-mentioned cyclic polyolefin resin may include a polymer of an olefin monomer and a cyclic monomer. Examples of the above-mentioned olefin monomer include ethylene, propyle