Lithium ion battery

• US 20070154795A1
• Filed: 12/28/2006
• Published: 07/05/2007
• Est. Priority Date: 12/29/2005
• Status: Active Grant

• Current Assignee: Samsung SDI Company Limited
• Original Assignee: Samsung SDI Company Limited
• Inventors: Kim, Joongheon, Lee, Hyungbok
• Granted Patent: US 8,318,346 B2
• Time in Patent Office: Days
• US Class Current: 429/162
• CPC Class Codes: H01M 10/0436 Small-sized flat cells or batteries for portable equipment
• 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 10/0585 of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
• CPC Class Codes: H01M 50/124 having a layered structure
• CPC Class Codes: H01M 50/126 comprising three or more layers
• 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

A lithium ion battery includes an electrode assembly having a first electrode plate folded into a V-shaped sectional surface, a second electrode plate which is inserted into an inner-side surface of the first electrode plate and which has an opposite polarity to the said first electrode plate, and separator which is interposed between the first electrode plate and the second electrode plate, a case to receive the electrode assembly, and a first electrode tab electrically coupled to the first electrode plate and which extends to the exterior of the case, and a second electrode tab electrically coupled to the second electrode plate, and which extends to the exterior of the case.

Claims

1. A lithium ion battery comprising:

an electrode assembly including a first electrode plate folded in a V-shape, a second electrode plate inserted into an open part of the first electrode plate and having an opposite polarity to the first electrode plate, and a separator interposed between the first electrode plate and the second electrode plate;

a case containing the electrode assembly;

a first electrode tab electrically coupled to the first electrode plate which extends to an exterior of the case; and

a second electrode tab electrically coupled to the second electrode plate which extends to the exterior of the case.

2. The lithium ion battery as claimed in claim 1, wherein the electrode assembly is formed as a rectangle having two length parts and two width parts, or is formed as a square having four equal sides.

3. The lithium ion battery as claimed in claim 2, wherein the electrode assembly is formed as the rectangle, and the two length parts or the two width parts are more than 150 mm.

4. The lithium ion battery as claimed in claim 2, wherein the electrode assembly is formed as the rectangle, wherein the width parts are 100 mm and the length parts are 200 mm.

5. The lithium ion battery as claimed in claim 2, wherein both the first electrode tab and the second electrode tab are formed in one of the width parts or one of the length parts of the electrode assembly if formed as the rectangle, or one of the sides if formed as the square.

6. The lithium ion battery as claimed in claim 2, wherein the first electrode tab is formed in one of the width parts and the second electrode tab is formed in one of the length parts of the electrode assembly if formed as the rectangle, or the first electrode tab is formed in one of the sides and the second electrode tab is formed in another of the sides of the electrode assembly if formed as the square.

7. The lithium ion battery as claimed in claim 1, further comprising:

a first electrode coating portion coated on two inner sides of the V-shaped first electrode plate; and

a second electrode coating portion coated on two sides of the second electrode plate which each face one of the inner sides, wherein a portion of the first electrode plate including a folded region thereof is not coated with the first or the second coating portion.

8. The lithium ion battery as claimed in claim 1, wherein the first electrode plate comprises an aluminum plate having good conductivity.

9. The lithium ion battery as claimed in claim 1, wherein the second electrode plate comprises a copper plate having good conductivity.

10. A lithium ion battery comprising:

an electrode assembly including a first electrode plate that is folded in a V-shape, a second electrode plate folded in a V-shape and having one end of the V-shape inserted into an open part of the V-shaped first electrode plate to stack alternately with the first electrode plate, and a separator interposed between the first electrode plate and the second electrode plate;

a case containing the electrode assembly;

a first electrode tab electrically coupled to the first electrode plate and which extends to an exterior of the case; and

a second electrode tab electrically coupled to the second electrode plate and which extends to the exterior of the case.

11. The lithium ion battery as claimed in claim 10, wherein the electrode assembly is formed as a rectangle having two length parts and two width parts, or is formed as a square having four equal sides.

12. The lithium ion battery as claimed in claim 11, wherein both the first electrode tab and second electrode tab are formed in one of the width parts or one of the length parts of the electrode assembly if formed as the rectangle, or one of the sides if formed as the square.

13. The lithium ion battery as claimed in claim 11, wherein the first electrode tab is formed in one of the width parts of the electrode assembly, and the second electrode tab is formed in one of the length parts of the electrode assembly if formed as the rectangle, or the first electrode tab is formed in one of the sides and the second electrode tab is formed in another of the sides of the electrode assembly if formed as the square.

14. The lithium ion battery as claimed in claim 10, further comprising:

a first electrode coating portion coated on two inner faces of the first electrode plate that is inserted into the open part of the second electrode plate and on an outside face of the first electrode plate that is not formed on an outer periphery of the electrode assembly; and

a second electrode coating portion coated on two inner faces of the second electrode plate that is inserted into an open part of the first electrode plate and on an outside face of the second electrode plate that is not formed on the outer periphery of the electrode assembly.

15. The lithium ion battery as claimed in claim 10, wherein the first electrode plate comprises an aluminum plate having good conductivity.

16. The lithium ion battery as claimed in claim 10, wherein the second electrode plate comprises a copper plate having good conductivity.

17. A lithium ion battery comprising:

an electrode assembly including a first electrode plate having a recess, a second electrode plate insertable into the recess and having an opposite polarity to the first electrode plate, and a separator interposed between the first electrode plate and the second electrode plate;

a case containing the electrode assembly;

a first electrode tab electrically coupled to the first electrode plate which extends to an exterior of the case; and

a second electrode tab electrically coupled to the second electrode plate which extends to the exterior of the case.

18. The lithium ion battery of claim 17, wherein the first electrode plate comprises two sections which are folded over to face each other, and the recess is located between the two folded over sections.

19. The lithium ion battery of claim 18, wherein the first electrode plate is folded into a V-shape.

20. The lithium ion battery as claimed in claim 18, further comprising:

a first electrode coating portion coated on inner sides of the folded sections of the first electrode plate; and

a second electrode coating portion coated on two sides of the second electrode plate which each face one of the inner sides, wherein a portion of the first electrode plate including a folded region thereof is not coated with the first or the second coating portion.