Tape
A tape for fixing an electrode assembly and a method of manufacturing a battery are provided. The tape for fixing an electrode assembly can effectively fix an electrode assembly in a can by realizing a 3D shape by means of an electrolyte. Thus, the tape can be useful in preventing the electrode assembly from moving and rotating inside a can by external vibration or impact and also preventing damage of welded regions of a tab or disconnection of inner circuits.
1. A tape for fixing an electrode assembly comprising:
a substrate layer configured to deform in a longitudinal direction when coming in contact with an electrolyte, wherein the substrate layer is a cast layer prepared from a composition including an active energy ray-polymerizable acrylate compound and a radical-polymerizable diluents, and wherein the active energy ray-polymerizable acrylate compound is urethane acrylate, epoxy acrylate, polyester acrylate or polyether acrylate; and
a pressure-sensitive adhesive layer formed on one surface of the substrate layer in a direction parallel to the longitudinal direction of the substrate layer,
wherein the pressure-sensitive adhesive layer has a peel strength at room temperature of 100 gf/25 mm to 2000 gf/25 mm, as measured at a peel angle of 180° and a peel rate of 5 mm/sec with respect to an electrode assembly or glass plate, and
wherein the tape forms a three-dimensional (3D) structure when coming in contact with the electrolyte, the 3D structure having a portion of the tape detached from a surface of the electrode assembly and protruding in a direction vertical to the longitudinal direction.
2. The tape of claim 1 , wherein the 3D structure having a height of 0.001 mm to 2.0 mm in the direction vertical to the longitudinal direction when coming in contact with the electrolyte.
3. The tape of claim 1 , wherein the substrate layer has a strain of 10% or more in the longitudinal direction according to the following Equation 1:
Strain in longitudinal direction=( L 2 −L 1 )/ L 1 100 Equation 1
wherein L 1 is an initial length of the substrate layer before the substrate layer comes in contact with the electrolyte; and
L 2 is a length of the substrate layer, which is measured after the substrate layer comes in contact with the electrolyte at room temperature or 60° C. for 24 hours.
4. The tape of claim 1 , wherein the substrate layer includes a urethane bond, an ester bond or an ether bond, or includes a cellulose ester compound.
5. The tape of claim 1 , wherein the radical-polymerizable diluent comprises at least one selected from the group consisting of an alkyl (meth)acrylate; a (meth)acrylate having an alkoxy group; a (meth)acrylate having an alicyclic group; a (meth)acrylate having an aromatic group; a (meth)acrylate having a heterocyclic group; and a multifunctional acrylate.
6. The tape of claim 1 , wherein the substrate layer comprises thermoplastic polyurethane.
7. The tape of claim 1 , wherein the substrate layer is a cast layer prepared from a curable urethane composition including polyol and isocyanate compounds.
8. The tape of claim 1 , wherein the substrate layer comprises a cellulose acetate resin or a cellulose alkylate resin.
9. The tape of claim 1 , wherein the pressure-sensitive adhesive layer includes an acryl pressure-sensitive adhesive, a urethane pressure-sensitive adhesive, an epoxy pressure-sensitive adhesive, a silicon pressure-sensitive adhesive or a rubber pressure-sensitive adhesive.
10. The tape of claim 1 , wherein the electrolyte is a carbonate-based electrolyte solution.
11. A method of manufacturing a battery, comprising:
contacting the tape of claim 1 with an electrolyte in a state in which an electrode assembly having the tape attached thereto is received in a can.
12. The method of claim 11 , wherein the electrolyte is a carbonate-based electrolyte solution.
13. A tape for fixing an electrode assembly comprising:
a substrate layer configured to deform in a longitudinal direction when coming in contact with an electrolyte; and
a pressure-sensitive adhesive layer formed on one surface of the substrate layer in a direction parallel to the longitudinal direction of the substrate layer,
wherein the pressure-sensitive adhesive layer has a peel strength at room temperature of 100 gf/25 mm to 2000 gf/25 mm, as measured at a peel angle of 180° and a peel rate of 5 mm/sec with respect to an electrode assembly or glass plate, and
wherein the tape forms a three-dimensional (3D) structure when coming in contact with the electrolyte, the 3D structure having a portion of the tape detached from a surface of the electrode assembly and protruding in a direction vertical to the longitudinal direction.
14. The tape of claim 13 , wherein the substrate layer comprises thermoplastic polyurethane.
15. The tape of claim 13 , wherein the substrate layer is a cast layer prepared from a curable urethane composition including polyol and isocyanate compounds.
16. The tape of claim 13 , wherein the substrate layer comprises a cellulose acetate resin or a cellulose alkylate resin.