Secondary battery comprising at least a first and second electrode each coated with an active material layer

• US 9,147,878 B2
• Filed: 07/31/2012
• Issued: 09/29/2015
• Est. Priority Date: 02/07/2012
• Status: Active Grant

• Current Assignee: Samsung SDI Company Limited
• Original Assignee: Samsung SDI Company Limited
• Inventors: Lee, Chanho, Kim, Kiwoon, Ahn, Youngju, Lee, Jinho, Park, Junpyo
• Primary Examiner(s): Ryan, Patrick
• Assistant Examiner(s): O DONNELL, LUCAS J
• Application Number:
  US13/563,374
• Publication Number:
  US 20130202931A1
• Time in Patent Office: 1,155 Days
• Field of Search: 429/94
• US Class Current: 1/1
• CPC Class Codes: H01M 10/052 Li-accumulators
• CPC Class Codes: H01M 10/058 Construction or manufacture
• CPC Class Codes: H01M 4/485 of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy H01M4/505, H01M4/525 take precedence
• CPC Class Codes: H01M 4/525 of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
• CPC Class Codes: H01M 4/5825 Oxygenated metallic salts or polyanionic structures, e.g. borates, phosphates, silicates, olivines
• CPC Class Codes: H01M 50/528 Fixed electrical connections, i.e. not intended for disconnection
• CPC Class Codes: H01M 50/534 characterised by the material of the leads or tabs
• CPC Class Codes: H01M 50/536 characterised by the method of fixing the leads to the electrodes, e.g. by welding
• CPC Class Codes: H01M 50/553 Terminals adapted for prismatic, pouch or rectangular cells
• CPC Class Codes: H01M 50/567 by fixing means, e.g. screws, rivets or bolts
• CPC Class Codes: H01M 50/581 in response to temperature
• 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

An electrode assembly and a secondary battery comprising the same are provided. The secondary battery includes at least one electrode assembly formed by winding together a first electrode plate and a second electrode plate each coated with an active material layer, a current collector, and a case accommodating the electrode assemblies and the current collector.

Claims

1. A secondary battery comprising:

a plurality of sub electrode assemblies each formed by winding together a first electrode plate and a second electrode plate each coated with an active material layer;

a current collector; and

a case accommodating the electrode assemblies and current collector,

wherein each sub electrode assemblies comprises;

at least one or more first sub electrode assemblies; and

a plurality of second sub electrode assemblies,

wherein the first sub electrode assemblies are disposed between the second sub electrode assemblies, and

wherein the first sub electrode assemblies are wound with a smaller number of turns than the second sub electrode assemblies.

2. The secondary battery of claim 1, wherein the active material layers of the first sub electrode assemblies include Li_xFePO₄ (0<

x≦

1).

3. The secondary battery of claim 1, wherein the active material layers of the second sub electrode assemblies include Li_xCoO₂ (0<

x≦

1).

4. The secondary battery of claim 1, further comprising an electrode terminal electrically connected to the current collector, wherein the current collector comprises:

a connection part electrically connected to the electrode terminal; and

an extension part extending from the connection part to at least three branch parts and coupled to each of the first sub electrode assemblies and the second sub electrode assemblies.

5. The secondary battery of claim 4, wherein a thickness of a portion of the extension part coupled to the first sub electrode assemblies is smaller than a thickness of a portion of the extension part coupled to the second sub electrode assemblies.

6. The secondary battery of claim 4, wherein the thickness of the extension part coupled to the first sub electrode assemblies is 1 mm and the thickness of the extension part coupled to the second sub electrode assemblies is 1.5 mm.

7. The secondary battery of claim 1, further comprising a separator disposed between the first and second electrode plates.

8. The secondary battery of claim 1, wherein the current collector is electrically connected to the sub electrode assemblies, respectively.

9. The secondary battery of claim 2, wherein x is 1.

10. The secondary battery of claim 3, wherein x is 1.

11. An electrode assembly of a secondary battery comprising a plurality of sub electrode assemblies formed by winding together a first electrode plate and a second electrode plate, each coated with an active material layer and a separator, respectively, the electrode assembly comprising:

at least one or more first sub electrode assemblies; and

a plurality of second sub electrode assemblies,

wherein the first sub electrode assemblies are disposed between the second sub electrode assemblies, and

wherein the first sub electrode assemblies are wound with a smaller number of turns than the second sub electrode assemblies.

12. The electrode assembly of claim 11, wherein the active material layers of the first sub electrode assemblies include Li_xFePO₄ (0<

x≦

1).

13. The electrode assembly of claim 11, wherein the active material layers of the second sub electrode assemblies include Li_xCoO₂ (0<

x≦

1).

14. The electrode assembly of claim 11, further comprising a separator disposed between the first and second electrode plates.

15. The secondary battery of claim 12, wherein x is 1.

16. The secondary battery of claim 13, wherein x is 1.