Secondary battery and electronic instrument using it

• US 20010005561A1
• Filed: 12/11/2000
• Published: 06/28/2001
• Est. Priority Date: 12/09/1999
• Status: Active Grant

• Current Assignee: LG Energy Solution Limited (LG Corporation)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Nishijima, Motoaki, Yamada, Kazuo, Mitate, Takehito
• Granted Patent: US 6,689,511 B2
• Time in Patent Office: Days
• US Class Current: 429/152
• 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 2006/106 Elliptic wound cells
• CPC Class Codes: H01M 50/105 Pouches or flexible bags
• CPC Class Codes: H01M 6/12 with flat electrodes
• CPC Class Codes: H01M 6/40 Printed batteries , e.g. thin film batteries
• 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 secondary battery comprising a battery main body composed of at least one battery element and an external packaging film, the battery element including an electrolyte as well as a positive electrode layer and a negative electrode layer holding the electrolyte therebetween, the external packaging film closely contacting and sealing the battery element, wherein the external packaging film sealing the battery element has, at a surface thereof, a difference in level according to a contour of the battery element.

Claims

1. A secondary battery comprising a battery main body composed of at least one battery element and an external packaging film, the battery element including an electrolyte as well as a positive electrode layer and a negative electrode layer holding the electrolyte therebetween, the external packaging film closely contacting and sealing the battery element,

wherein the external packaging film sealing the battery element has, at a surface thereof, a difference in level according to a contour of the battery element.

2. The secondary battery according to

claim 1

, wherein the difference in level is formed by a plurality of planes perpendicular to a direction in which the electrolyte and the positive and negative electrode layers of the battery element are laminated.

3. The secondary battery according to

claim 1

or

2

wherein the difference in level is formed by the difference of the number of the laminated layers of the battery elements.

4. The secondary battery according to any one of

claims 1

to

3

, wherein the difference in level is formed between a high portion defined by a surface of a second battery element which is laminated on a surface of a first battery element and is smaller than the first battery element and a low portion defined by an exposed surface of the first battery element.

5. The secondary battery according to any one of

claims 1

to

3

, wherein the battery element is wound round, and the difference in level is formed between a high portion defined by a surface of an outside end portion of the battery element and a low portion defined by an exposed surface of the battery element below the outside end portion.

6. The secondary battery according to any one of

claims 1

to

3

, wherein the battery element is folded, and the difference in level is formed between a high portion defined by a surface of an upper end portion of the battery element and a low portion defined by an exposed surface of the battery element below the upper end portion.

7. The secondary battery according to any one of

claims 1

to

3

, wherein the difference in level is formed between a high portion defined by a surface of a circuit portion disposed on a surface of the battery element and a low portion defined by an exposed surface of the battery element.

8. The secondary battery according to any one of

claims 1

to

7

wherein the external packaging film is adhered to the battery element by vacuum packaging.

9. The secondary battery according to any one of

claims 1

to

8

wherein the difference in level is from 10 μ

m to 2 mm.

10. The secondary battery according to any one of

claims 1

to

9

wherein the electrolyte is made of a solid polymer electrolyte.

11. An electronic instrument comprising the secondary battery claimed in

claim 1

, an electronic part group, and an external packaging case, wherein the high portion and the low portion of forming the difference in level of the surface of the external film of the secondary battery are disposed facing the electronic parts having different heights or facing the wall surface having different heights of the external packaging case, whereby the secondary battery and the electronic part group are placed in the external packaging case in a dense state.

12. The electronic instrument according to

claim 11

wherein the secondary battery is a lithium ion battery.

13. The electronic instrument according to

claim 11

wherein the electronic instrument is a portable terminal.

14. The electronic instrument according to

claim 13

wherein the portable terminal is a potable information instrument such as a portable telephone, a notebook personal computer or an electronic pocketbook, a potable-type game device, a card-type computer or a digital camera.