SECONDARY BATTERY

• US 20120082891A1
• Filed: 08/19/2011
• Published: 04/05/2012
• Est. Priority Date: 10/01/2010
• Status: Active Grant

• Current Assignee: Samsung SDI Company Limited
• Original Assignee: Samsung SDI Company Limited
• Inventors: Ahn, Chang-Bum
• Granted Patent: US 9,490,464 B2
• Time in Patent Office: Days
• US Class Current: 429/211
• CPC Class Codes: H01M 10/0436 Small-sized flat cells or batteries for portable equipment
• 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 50/414 Synthetic resins, e.g. thermoplastics or thermosetting resins
• CPC Class Codes: H01M 50/417 Polyolefins
• CPC Class Codes: H01M 50/429 Natural polymers
• CPC Class Codes: H01M 50/4295 Natural cotton, cellulose or wood
• CPC Class Codes: H01M 50/44 Fibrous material
• CPC Class Codes: H01M 50/449 having a layered structure
• CPC Class Codes: H01M 50/46 Separators, membranes or diaphragms characterised by their combination with electrodes
• CPC Class Codes: H01M 50/463 Separators, membranes or diaphragms characterised by their shape
• CPC Class Codes: H01M 50/54 Connection of several leads or tabs of plate-like electrode stacks, e.g. electrode pole straps or bridges
• CPC Class Codes: H01M 50/581 in response to temperature
• CPC Class Codes: H01M 50/586 inside the batteries, e.g. incorrect connections of electrodes
• CPC Class Codes: H01M 50/593 Spacers; Insulating plates
• 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 are a secondary battery including an electrode assembly which includes a first electrode plate and a second electrode plate arranged as a stack, and a separator interposed between the first electrode plate and the second electrode plate, the first electrode plate including a first active material coating part formed by coating a base with a first active material and a first non-coating part, the second electrode plate including the second active material coating part formed by coating a base with a second active material and a second non-coating part, and the first non-coating part including an insulating member in a portion corresponding to the second electrode plate.

Claims

1. A secondary battery comprising:

an electrode assembly comprising a first electrode plate and a second electrode plate arranged as a stack, and a separator interposed between the first electrode plate and the second electrode plate,

wherein the first electrode plate comprises a first active material coated part and a first non-coated part;

wherein the second electrode plate comprises a second active material coated part and a second non-coated part;

and wherein the first non-coated part comprises an insulating member in a portion corresponding to the second electrode plate.

2. The secondary battery of claim 1, wherein the first non-coated part and the second non-coated part extend from the first active material coated part and the second active material coated part, respectively.

3. The secondary battery of claim 1, wherein the first non-coated part adjacent to the first active material coated part of the first electrode plate comprises the insulating member.

4. The secondary battery of claim 1, wherein the insulating member and the first non-coated part of the first electrode plate have a laminated structure.

5. The secondary battery of claim 1, wherein the insulating member covers a front surface and a back surface of the first non-coated part.

6. The secondary battery of claim 1, wherein the insulating member comprises one or more of a cellulose film, a PP film, and a PI film.

7. The secondary battery of claim 1, wherein the insulating member further comprises an additional ceramic coating layer on the insulating member.

8. The secondary battery of claim 7, wherein the ceramic coating layer comprises one or more of Al₂O₃, BaTiO₄, TiO₂ and SiO₂.

9. The secondary battery of claim 7, wherein the ceramic coating layer is formed by mixing two materials selected from Al₂O₃, BaTiO₄, TiO₂ and SiO₂.

10. The secondary battery of claim 9, wherein the two materials are mixed at a weight ratio of from about 7:

3 to about 1;

1.

11. The secondary battery of claim 1, wherein the thickness of the insulating member is the thickness of the first active material coated part or less.

12. The secondary battery of claim 1, further comprising a first electrode tab, a second electrode tab, a first electrode lead and a second electrode lead, wherein the first electrode tab and second electrode tab extend from the first electrode plate and second electrode plate, respectively, and each comprise a tab coupling part, wherein the tab coupling part is a portion where the first electrode tab and the first electrode lead are coupled or second electrode tab and the second electrode lead are coupled.

13. The secondary battery of claim 12, wherein the insulating member is further formed on the first electrode tab.

14. The secondary battery of claim 13, wherein the insulating member is formed on a portion that does not include the tab coupling part.

15. The secondary battery of claim 12, wherein the first electrode plate comprises a positive electrode plate and the second electrode plate comprises a negative electrode plate, wherein the first electrode tab comprises a positive electrode tab, wherein the second electrode tab comprises a negative electrode tab, wherein the first electrode lead comprises a positive electrode lead and wherein the second electrode lead comprises a negative electrode lead.

16. The secondary battery of claim 1, wherein the second electrode plate comprises the same area of the first electrode plate or greater.

17. The secondary battery of claim 12, wherein the width of the first and second electrode tabs is narrower than the width of the first and second electrode plates, respectively.

18. The secondary battery of claim 12, further comprising a lead film on at least one of the first electrode lead and the second electrode lead.

19. The secondary battery of claim 1, wherein a portion of the insulating member is arranged in an area which corresponds to the second active material coated part.

20. The secondary battery of claim 10, wherein the ceramic coating layer comprises two of Al₂O₃, BaTiO₄, TiO₂ and SiO₂ in a weight ratio of from 7:

3, with seven parts of Al₂O₃ or TiO₂ and three parts BaTiO₄ or SiO₂, to 1;

1.