ELECTRODE ASSEMBLY

• US 20130280570A1
• Filed: 07/11/2013
• Published: 10/24/2013
• Est. Priority Date: 01/27/2011
• Status: Active Grant

• Current Assignee: LG Energy Solution Limited (LG Corporation)
• Original Assignee: LG Chem Limited (LG Corporation)
• Inventors: KIM, Sung Jong, KU, Cha-Hun, JUNG, Byungkyu
• Granted Patent: US 9,222,003 B2
• Time in Patent Office: Days
• US Class Current: 429/94
• CPC Class Codes: B32B 27/285 comprising polyethers
• CPC Class Codes: B32B 27/308 comprising acrylic (co)polymers
• CPC Class Codes: B32B 27/36 comprising polyesters
• CPC Class Codes: B32B 27/38 comprising epoxy resins
• CPC Class Codes: B32B 27/40 comprising polyurethanes
• CPC Class Codes: B32B 37/02 characterised by a sequence of laminating steps, e.g. by adding new layers at consecutive laminating stations
• CPC Class Codes: C09J 133/08 Homopolymers or copolymers of acrylic acid esters
• CPC Class Codes: C09J 2203/33 for batteries or fuel cells
• CPC Class Codes: C09J 2401/006 in the substrate
• CPC Class Codes: C09J 2433/00 Presence of (meth)acrylic polymer
• CPC Class Codes: C09J 2433/006 in the substrate
• CPC Class Codes: C09J 2463/00 Presence of epoxy resin
• CPC Class Codes: C09J 2463/006 in the substrate
• CPC Class Codes: C09J 2475/00 Presence of polyurethane
• CPC Class Codes: C09J 2475/006 in the substrate
• CPC Class Codes: C09J 7/22 Plastics; Metallised plastics
• CPC Class Codes: C09J 7/241 Polyolefin, e.g.rubber
• CPC Class Codes: C09J 7/245 Vinyl resins, e.g. polyvinyl chloride [PVC]
• CPC Class Codes: C09J 7/25 based on macromolecular compounds obtained otherwise than by reactions involving only carbon-to-carbon unsaturated bonds
• CPC Class Codes: C09J 7/26 Porous or cellular plastics
• CPC Class Codes: C09J 7/29 : Laminated material metallised plastics C09J7/22
• CPC Class Codes: H01M 10/02 : Details of electrodes H01M4/00; of non-active parts H01M50/00
• CPC Class Codes: H01M 10/0431 : Cells with wound or folded electrodes H01M10/045 takes precedence
• CPC Class Codes: H01M 10/049 : Processes for forming or storing electrodes in the battery container
• CPC Class Codes: H01M 4/04 : Processes of manufacture in general
• CPC Class Codes: H01M 6/005 : Devices for making primary cells
• CPC Class Codes: Y02E 60/10 : Energy storage using batteries
• CPC Class Codes: Y02P 70/50 : Manufacturing or production processes characterised by the final manufactured product
• CPC Class Codes: Y10T 29/49114 : including adhesively bonding
• CPC Class Codes: Y10T 428/24521 : with component conforming to contour of nonplanar surface
• CPC Class Codes: Y10T 428/28 : Web or sheet containing structurally defined element or component and having an adhesive outermost layer
• CPC Class Codes: Y10T 428/2852 : Adhesive compositions
• CPC Class Codes: Y10T 428/287 : including epoxy group or epoxy polymer
• CPC Class Codes: Y10T 428/2891 : including addition polymer from alpha-beta unsaturated carboxylic acid [e.g., acrylic acid, methacrylic acid, etc.] Or derivative thereof

Abstract

An electrode assembly and a battery are provided. The electrode assembly may be effectively fixed inside a can as a pressure-sensitive adhesive tape attached to an outer circumferential surface of the electrode assembly is formed into a 3D shape by an electrolyte. Thus, the electrode assembly does not move and rotate inside the can due to external vibration or impact and damage of welded regions of a tab or disconnection of inner circuits can be prevented.

Claims

1. An electrode assembly having a pressure-sensitive adhesive tape attached to an outer circumferential surface thereof,

wherein the pressure-sensitive adhesive tape comprises:

a substrate layer deforming 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.

2. The electrode assembly of claim 1, further comprising:

a positive electrode plate;

a negative electrode plate; and

a separator formed between the positive electrode plate and the negative electrode plate.

3. The electrode assembly of claim 2, which is wound in a jelly-roll shape.

4. The electrode assembly of claim 1, wherein the pressure-sensitive adhesive tape is formed into a three-dimensional (3D) structure having a height of 0.001 mm to 2.0 mm in a direction vertical to the longitudinal direction when the pressure-sensitive adhesive tape comes in contact with the electrolyte.

5. The electrode assembly 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=(L₂−

L₁)/L₁×

100 

 

Equation 1

wherein L₁ is an initial length of the substrate layer before the substrate layer comes in contact with the electrolyte; and

L₂ 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.

6. The electrode assembly of claim 1, wherein the substrate layer is a substrate layer including a urethane bond, an ester bond or an ether bond, or including a cellulose ester compound.

7. The electrode assembly of claim 1, wherein the substrate layer is a cast layer of a composition including an active energy ray-polymerizable acrylate compound and a radical-polymerizable diluent.

8. The electrode assembly of claim 7, wherein the active energy ray-polymerizable acrylate compound is urethane acrylate, epoxy acrylate, polyester acrylate or polyether acrylate.

9. The electrode assembly of claim 7, 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.

10. The electrode assembly of claim 1, wherein the substrate layer comprises thermoplastic polyurethane.

11. The electrode assembly of claim 1, wherein the substrate layer is a cast layer of a curable urethane composition including polyol and isocyanate compounds.

12. The electrode assembly of claim 1, wherein the substrate layer comprises a cellulose acetate resin or a cellulose alkylate resin.

13. The electrode assembly of claim 1, wherein the pressure-sensitive adhesive layer has a peel strength at room temperature of 100 gf/25 mm or more, 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.

14. The electrode assembly 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.

15. The electrode assembly of claim 1, wherein the electrolyte is a carbonate-based electrolyte solution.

16. A battery comprising:

the electrode assembly of claim 1;

a can having the electrode assembly received therein; and

an electrolyte coming in contact with the electrode assembly inside the can.

17. The battery of claim 16, wherein the pressure-sensitive adhesive tape of the electrode assembly fixes the electrode assembly inside the can by forming a 3D shape realized by an electrolyte.

18. The battery of claim 16, wherein the electrolyte is a carbonate-based electrolyte solution.