Swelling tape for filling gap
AssigneeLG Chem, Ltd.
InventorsMin Soo Park, Byung Kyu Jung, Yoon Tae Hwang, Se Woo Yang, Suk Ky Chang, Sung Jong Kim, Ji Young Hwang, Cha Hun Ku
Life of this patent
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Abstract
The present invention relates to swelling tape for filling a gap and its use. The swelling tape is, for example, applied between gaps in which a fluid is present, thereby being deformed into a three-dimensional shape to fill the gap and fix an object separated by gaps as needed.
Claims10
A battery, comprising:
- an electrode assembly having a circumferential surface;
- a can encasing the assembly, the can spaced apart from the circumferential surface by a gap;
- a swelling tape attached to the circumferential surface and disposed in the gap;
- and
- an electrolyte in contact with the assembly in the can,
- wherein the swelling tape fixes the electrode assembly to an inside of the can upon contact with the electrolyte, the swelling tape deformed into a three-dimensional shape upon contact with the electrolyte and extending into the gap to fix the electrode assembly to the inside of the can,
- wherein the swelling tape comprises:
- a substrate film having, prior to contact with the electrolyte, a shore A hardness according to ASTM D2240 of 70A or more, or a shore D hardness according to JIS K-7311 of 40D or more;
- and
- a pressure-sensitive adhesive layer on one surface of the substrate film, and in a direction parallel to a length direction of the substrate film,
- wherein the substrate film consists of thermoplastic polyurethane,
- wherein the thermoplastic polyurethane is a reaction product of a mixture of an isocyanate compound having at least two isocyanate groups, a polymer polyol compound, and a chain extender, and
- wherein a total content of the isocyanate compound and the extender in the mixture is 100 to 300 parts by weight, relative to 100 parts by weight of the polymer polyol compound.
A method of filling a gap formed between an electrode assembly having a circumferential surface and a can encasing the electrode assembly, the can spaced apart from the circumferential surface by the gap, wherein the electrode assembly and the can are components of a battery, the method comprising:
- attaching a pressure-sensitive adhesive layer of a swelling tape to the circumferential surface of the electrode assembly;
- and
- contacting a substrate film of the swelling tape with an electrolyte to deform the swelling tape into a three-dimensional shape, the deformed swelling tape extending into the gap to fix the electrode assembly to an inside of the can,
- wherein the swelling tape comprises:
- a substrate film, prior to contact with the electrolyte, having a shore A hardness according to ASTM D2240 of 70A or more, or a shore D hardness according to JIS K-7311 of 40D or more;
- and
- a pressure-sensitive adhesive layer on one surface of the substrate film, and in a direction parallel to a length direction of the substrate film,
- wherein the substrate film consists of thermoplastic polyurethane,
- wherein the thermoplastic polyurethane is a reaction product of a mixture of an isocyanate compound having at least two isocyante groups, a polymer polyol compound, and a chain extender, and
- wherein a total content of the isocyanate compound and the extender in the mixture is 100 to 300 parts by weight, relative to 100 parts by weight of the polymer polyol compound.
Dependencies are inferred from the claim text.