BATTERY HAVING ENHANCED ELECTRICAL INSULATION CAPABILITY

• US 20100285342A1
• Filed: 01/28/2009
• Published: 11/11/2010
• Est. Priority Date: 01/28/2008
• Status: Active Grant

• Current Assignee: LG Energy Solution Limited (LG Corporation)
• Original Assignee: LG Chem Limited (LG Corporation)
• Inventors: Lee, Kil Young, Lee, Jin Soo, Kim, Dong Myung
• Granted Patent: US 8,557,423 B2
• Time in Patent Office: Days
• US Class Current: 429/94
• CPC Class Codes: H01M 10/0413 Large-sized flat cells or batteries for motive or stationary systems with plate-like electrodes
• CPC Class Codes: H01M 10/0431 Cells with wound or folded electrodes H01M10/045 takes precedence
• CPC Class Codes: H01M 10/0436 Small-sized flat cells or batteries for portable equipment
• CPC Class Codes: H01M 10/052 Li-accumulators
• CPC Class Codes: H01M 10/0525 Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
• CPC Class Codes: H01M 10/0587 of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
• CPC Class Codes: H01M 10/4235 Safety or regulating additives or arrangements in electrodes, separators or electrolyte H01M10/4242 takes precedence
• CPC Class Codes: H01M 2220/30 Batteries in portable systems, e.g. mobile phone, laptop
• CPC Class Codes: H01M 4/13 Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
• CPC Class Codes: H01M 50/586 inside the batteries, e.g. incorrect connections of electrodes
• CPC Class Codes: H01M 50/595 Tapes
• 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

Abstract

Disclosed is a battery including a cathode in which cathode active-material coating layers provided on both surfaces of a cathode collector are longitudinally deviated from each other, and an anode having at least one anode active-material coating layer provided on an anode collector, the cathode and anode being wound to face each other with a separator interposed therebetween. At least one of a winding beginning portion and winding ending portion of the cathode is provided with a cathode uncoated part for installation of a cathode lead. An insulator tape is attached to the boundary of the cathode active-material coating layer at a position where the anode active-material coating layer faces a non-coating part of the cathode not containing the cathode active-material coating layer, achieving enhanced electrical insulation capability and consequential safety of the battery.

Claims

1. A battery comprising:

a cathode having a cathode active-material coating layer provided on at least one surface of a cathode collector; and

an anode having an anode active-material coating layer provided on at least one surface of an anode collector, the cathode and anode being wound to face each other with a separator interposed therebetween, wherein the cathode active-material coating layer applied to the at least one surface of the cathode collector is longitudinally deviated from a cathode active-material coating layer applied to the other surface of the cathode collector such that application beginning and ending portions of both the cathode active-material coating layers are not consistent with each other, and only at least one of a winding beginning portion and winding ending portion of the cathode is provided with a cathode uncoated part for installation of a cathode lead, and wherein an insulator tape is attached to the boundary of the cathode active-material coating layer at a position where the anode active-material coating layer faces a non-coating part of the cathode not containing the cathode active-material coating layer.

4. The battery according to claim 1 , wherein a tip end of the cathode, which corresponds to the application beginning portion of the cathode active-material coating layer provided on the at least one surface of the cathode collector and the application beginning portion of the cathode active-material coating layer provided on the other surface of the cathode collector, is provided on only at least one surface thereof with the cathode active-material coating layer, and is provided on the other surface thereof with a non-coating part not containing the cathode active-material coating layer.

6. The battery according to any one of claim 1, wherein the non-coating part, not containing the cathode active-material coating layer, provided at the tip end of the cathode faces another non-coating part not containing the cathode active-material coating layer with the separator interposed therebetween.

7. The battery according to claim 6, wherein the separator is provided in at least two layers.

8. The battery according to claim 1, wherein, on the basis of the winding beginning portion, the insulator tape is attached to the boundary of the cathode active-material coating layer at both distal ends of a lower surface of the cathode collector and to the boundary of the cathode active-material coating layer at a distal end of an upper surface of the cathode collector.

12. The battery according to claim 1, wherein the insulator tape is provided during a winding process or electrode coating process.

13. The battery according to claim 1, wherein the cathode lead and an anode lead of the battery are arranged in opposite directions.

14. The battery according to claim 1, wherein the anode is provided on at least one of a winding beginning portion and winding ending portion thereof with an anode uncoated-part not containing the anode active-material coating layer for connection of an anode lead, and wherein two or more insulator layers are provided on the other surface of the anode collector, to which the anode lead is connected, at a position corresponding to the anode lead.

15. The battery according to claim 1, wherein a cut face of an anode uncoated part provided at a tip end of the anode as a winding beginning portion is insulated and protected by a plurality of separators, and an opposite side of the anode uncoated part is protected by the insulator tape on the boundary of the cathode active-material coating layer, and wherein a cut face of the anode uncoated part at a distal end of the anode as a winding ending portion is protected by the insulator tape on the boundary of the cathode active-material coating layer.

16. The battery according to claim 1, wherein an ending portion of the separator extends beyond a distal end of the anode.

17. The battery according to claim 16, wherein the ending portion of the separator extends from the distal end of the anode by about 5 mm or more.

18. The battery according to claim 1, wherein the insulator tape is one or more selected from the group consisting of a polyimide tape, acetate tape, glass cloth tape, polyester tape, polyphenylenesulfide (PPS) tape, and polypropylene tape.

19. The battery according to claim 1, wherein the insulator tape has a thickness of 10 μ

m to 100 μ

m

20. A prismatic battery wherein the battery according to claim 1 is received in a prismatic battery can, and a non-aqueous electrolyte is further provided.

2. A battery comprising:

a cathode having a cathode active-material coating layer provided on at least one surface of a cathode collector; and

an anode having an anode active-material coating layer provided on at least one surface of an anode collector, the cathode and anode being wound to face each other with a separator interposed therebetween, wherein the cathode active-material coating layer applied to the at least one surface of the cathode collector is longitudinally deviated from a cathode active-material coating layer applied to the other surface of the cathode collector such that application beginning and ending portions of both the cathode active-material coating layers are not consistent with each other, only at least one of a winding beginning portion and winding ending portion of the cathode is provided with a cathode uncoated part for installation of a cathode lead, and an additional cathode active-material coating layer is provided on at least one surface of a distal end of the cathode uncoated-part, and wherein an insulator tape is attached to the boundary of the cathode active-material coating layer at a position where the anode active-material coating layer faces a non-coating part of the cathode not containing the cathode active-material coating layer.

9. The battery according to claim 2, wherein, on the basis of the winding beginning portion, the insulator tape is attached to the boundary of the cathode active-material coating layer at both distal ends of a lower surface of the cathode collector and to the boundary of the cathode active-material coating layer at a distal end of an upper surface of the cathode collector.

10. The battery according to claim 2, wherein, on the basis of the winding beginning portion, the insulator tape is attached to the boundary of the cathode active-material coating layer at both distal ends of an upper surface of the cathode collector, to the boundary of the cathode active-material coating layer at both distal ends of a lower surface of the cathode collector, and to the boundary of the cathode active-material coating layer at the distal end of the cathode uncoated-part.

21. A prismatic battery wherein the battery according to claim 2 is received in a prismatic battery can, and a non-aqueous electrolyte is further provided.

3. A battery comprising:

a cathode having a cathode active-material coating layer provided on at least one surface of a cathode collector; and

an anode having an anode active-material coating layer provided on at least one surface of an anode collector, the cathode and anode being wound to face each other with a separator interposed therebetween, wherein the cathode active-material coating layer applied to the at least one surface of the cathode collector is longitudinally deviated from a cathode active-material coating layer applied to the other surface of the cathode collector such that application beginning and ending portions of both the cathode active-material coating layers are not consistent with each other, wherein the cathode is provided at a winding beginning portion and winding ending portion thereof with cathode uncoated parts, respectively, a cathode lead is installed to at least one of the cathode uncoated parts of the winding beginning portion and winding ending portion, and an insulator tape is provided at a distal end of the cathode uncoated-part containing the cathode lead, and wherein an insulator tape is attached to the boundary of the cathode active-material coating layer at a position where the anode active-material coating layer faces a non-coating part of the cathode not containing the cathode active-material coating layer.

5. The battery according to claim 3, wherein the cathode has the cathode uncoated-parts not containing the cathode active-material coating layer at both distal ends of the cathode collector, and wherein a tip end of the cathode, which corresponds to the application beginning portion of the cathode active-material coating layer provided on the at least one surface of the cathode collector and the application beginning portion of the cathode active-material coating layer provided on the other surface of the cathode collector, is provided on only at least one surface thereof with the cathode active-material coating layer, and is provided on the other surface thereof with a non-coating part not containing the cathode active-material coating layer.

11. The battery according to claim 3, wherein, on the basis of the winding beginning portion, the insulator tape is attached to the boundary of the cathode active-material coating layer at both distal ends of an upper surface of the cathode collector, to the boundary of the cathode active-material coating layer at a distal end of a lower surface of the cathode collector, and to the distal end of the cathode collector where the cathode lead is installed.

22. A prismatic battery wherein the battery according to claim 3 is received in a prismatic battery can, and a non-aqueous electrolyte is further provided.