Electrode assembly

• US 9,222,003 B2
• Filed: 07/11/2013
• Issued: 12/29/2015
• 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, Jung, Byungkyu, Ku, Cha-Hun
• Primary Examiner(s): Ryan, Patrick
• Assistant Examiner(s): Zhang, Haixia
• Application Number:
  US13/939,650
• Publication Number:
  US 20130280570A1
• Time in Patent Office: 901 Days
• Field of Search: None
• US Class Current: 1/1
• 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 that is swelled along 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 and having 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, and

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.

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 is one selected from the group consisting of a substrate layer including a urethane bond, a substrate layer including an ester bond, a substrate layer including an ether bond, and a substrate layer including a cellulose ester compound.

6. 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.

7. The electrode assembly of claim 6, 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.

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

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

10. The electrode assembly of claim 1, wherein the substrate layer comprises one selected from the group consisting of a cellulose acetate resin and a cellulose alkylate resin.

11. The electrode assembly of claim 1, wherein the pressure-sensitive adhesive layer comprises one selected from the group consisting of an acryl pressure-sensitive adhesive, a urethane pressure-sensitive adhesive, an epoxy pressure-sensitive adhesive, a silicon pressure-sensitive adhesive and a rubber pressure-sensitive adhesive.

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

13. 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.

14. The battery of claim 13, 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.

15. The battery of claim 13, wherein the electrolyte is a carbonate-based electrolyte solution.

16. The electrode assembly of claim 1, wherein the substrate layer has a strain of 10% to 500%.

17. The electrode assembly of claim 1, wherein the substrate layer has a strain of 30% or more.

18. The electrode assembly of claim 6, wherein the active energy ray-polymerizable acrylate compound is one selected from the group consisting of urethane acrylate, epoxy acrylate, polyester acrylate and polyether acrylate.