Laminated cell and method for manufacturing same

Patent metadata

Field	Value
Publication number	US-10818901-B2
Application number	US-201214127254-A
Country	US
Kind code	B2
Filing date	Mar 19, 2012
Priority date	Jun 21, 2011
Publication date	Oct 27, 2020
Grant date	Oct 27, 2020

Abstract

A laminated cell (100) of the present invention includes a laminated body (120) formed by sequential stacking a negative electrode (130), a separator (170, 180), a positive electrode (150), and a separator (170, 180). At least one of surfaces of the positive electrode (150) or the negative electrode (130) in a stacking direction (S) has a portion to which a resin member (190) is bonded. The separators each have a portion bonded to the resin member (190) on a side facing the at least one of surfaces. In the present invention, since the separators and at least one of the positive electrode and the negative electrode are integrated together, misalignment in a stacking work can be easily suppressed and the laminated cell has excellent productivity.

First claim

The invention claimed is:

1. A laminated cell comprising:
a laminated body formed by sequentially stacking a negative electrode, a first separator, a positive electrode, and a second separator, the negative electrode comprising a negative-electrode current collector having a negative-electrode active material layer disposed on opposing sides thereof, and the positive electrode comprising a positive-electrode current collector having a positive-electrode active material layer disposed on opposing sides thereof; and
one or more resin members that are electrically insulative, wherein
the negative-electrode current collector includes a current collecting portion that extends past a rear edge of the negative-electrode active material layer,
the positive-electrode current collector includes a current collecting portion that extends past a front edge of the positive-electrode active material layer,
a first side of the one or more resin members is disposed on a surface of the positive-electrode active material layer and a surface of the positive-electrode current collector,
the first side of the one or more resin members is bonded to the positive-electrode active material layer with an adhesive,
a second side of the one or more resin members, opposite to the first side of the one or more resin members, is bonded to the first separator or the second separator with an adhesive, and
the current collecting portion of the negative-electrode current collector does not overlap the current collecting portion of the positive-electrode current collector in a stacking direction of the laminated cell.

2. The laminated cell according to claim 1 , wherein
both surfaces of the positive electrode in a stacking direction have portions to which the one or more resin members are bonded, and
the first and second separators have portions bonded to the one or more resin members on sides facing both of the surfaces.

3. The laminated cell according to claim 1 , wherein the one or more resin members are disposed in at least a region in which an active material is disposed.

4. The laminated cell according to claim 1 , wherein the one or more resin members have: an electrically insulative base member; and an adhesive disposed on both surfaces of the base member in the stacking direction.

5. The laminated cell according to claim 4 , wherein the electrically insulative base member comprises a resin.

6. The laminated cell according to claim 5 , wherein the resin comprises polypropylene, polyethylene, or polyamide.

7. The laminated cell according to claim 4 , wherein the adhesive comprises synthetic rubber, butyl rubber, synthetic resin, or acryl.

8. The laminated cell according to claim 1 , wherein the one or more resin members comprises a double-sided adhesive tape.

9. The laminated cell according to claim 1 , wherein the one or more resin members are disposed on both the surface of the positive-electrode active material layer and the surface of the current collecting portion of the positive-electrode current collector.

10. The laminated cell according to claim 1 , wherein the one or more resin members are disposed on both the surface of the negative-electrode active material layer and the surface of the current collecting portion of the negative-electrode current collector.

11. The laminated cell according to claim 1 , further comprising an exterior member formed of an upper portion and a lower portion,
wherein the laminated body is provided between the upper portion and the lower portion.

12. The laminated cell according to claim 11 , further comprising an additional resin member that is electrically insulative,
wherein a first side of the additional resin member is disposed on a surface of the current collecting portion of the positive-electrode current collector, and a second side of the additional resin member, opposite to the first side of the additional resin member, is bonded to the upper portion of the exterior member.

13. A method for manufacturing a laminated cell having a laminated body formed by sequentially stacking a negative electrode, a first separator, a positive electrode, and a second separator, the negative electrode comprising a negative-electrode current collector having a negative-electrode active material layer disposed on opposing sides thereof, and the positive electrode comprising a positive-electrode current collector having a positive-electrode active material layer disposed on opposing sides thereof, the method comprising:
disposing a first side of one or more resin members on a surface of the positive-electrode active material layer and a surface of the positive-electrode current collector,
bonding the first side of the one or more resin members to the positive-electrode active material layer with an adhesive,
bonding the first separator or the second separator to a second side of the one or more resin members with an adhesive,
wherein the one or more resin members are electrically insulative, and
wherein a current collecting portion of the negative-electrode current collector extends past a rear edge of the negative-electrode active material layer, and a current collecting portion of the positive-electrode current collector extends past a front edge of the positive-electrode active material layer.

14. The method for manufacturing the laminated cell according to claim 13 , further comprising bonding surfaces of the positive electrode in a stacking direction to the one or more resin members,
wherein the first and second separators are bonded to the one or more resin members on sides facing the surfaces.

15. The method for manufacturing the laminated cell according to claim 13 , wherein the one or more resin members are disposed in at least a region in which an active material is disposed.

16. The method for manufacturing the laminated cell according to claim 13 , wherein the one or more resin members have: an electrically insulative base member; and an adhesive disposed on both surfaces of the base member in a stacking direction.

17. A laminated cell comprising:
a laminated body formed by sequentially stacking a negative electrode, a first separator, a positive electrode, and a second separator, the negative electrode comprising a negative-electrode current collector having a negative-electrode active material layer disposed on opposing sides thereof, and the positive electrode comprising a positive-electrode current collector having a positive-electrode active material layer disposed on opposing sides thereof; and
one or more resin members that are electrically insulative, wherein
each of the negative-electrode current collector and the positive-electrode current collector includes a current collecting portion, the current collecting portion of the negative-electrode current collector extending past a rear edge of the negative-electrode active material layer, and the current collecting portion of the positive-electrode current collector extending past a front edge of the positive-electrode active material layer,
a first side of the one or more resin members is disposed on a surface of the positive-electrode active material layer and a surface of the positive-electrode current collector,
the first side of the one or more resin members is bonded to the positive-electrode active material layer with an adhesive, and
a second side of the one or more resin members, opposite to the first side of the one or more resin members, is bonded to the first separator or the second separator with an adhesive.

Assignees

• Kim Taewon
• Hisajima Kazumi
• Envision Aesc Japan Ltd

Inventors

• Kim Taewon
• Hisajima Kazumi

Classifications

• H01M50/46 Primary

  Separators, membranes or diaphragms characterised by their combination with electrodes · CPC title

• H01M10/0436 Primary

  Small-sized flat cells or batteries for portable equipment · CPC title

• H01M50/409

  Separators, membranes or diaphragms characterised by the material · CPC title

• H01M50/414

  Synthetic resins, e.g. thermoplastics or thermosetting resins · CPC title

• H01M10/052

  Li-accumulators · CPC title