Cylindrical cell and manufacturing method thereof

• US 20070020518A1
• Filed: 08/23/2004
• Published: 01/25/2007
• Est. Priority Date: 08/25/2003
• Status: Active Grant

• Current Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Original Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Kato, Masahiko, Bito, Seiji, Yoneyama, Satoshi
• Granted Patent: US 7,763,378 B2
• Time in Patent Office: Days
• US Class Current: 429/181
• CPC Class Codes: H01M 50/107 having curved cross-section, e.g. round or elliptic H01M50/103, H01M50/109, H01M50/11 take precedence
• CPC Class Codes: H01M 50/533 characterised by the shape 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 50/578 in response to pressure
• 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
• CPC Class Codes: Y10T 29/4911 including sealing
• CPC Class Codes: Y10T 29/49114 including adhesively bonding

Abstract

A cylindrical battery includes: an electrode plate assembly (5); a positive electrode collector (10) welded to a projecting portion of a core material for a positive electrode of the electrode plate assembly (5); a negative electrode collector (11) that includes a plurality of projections (12) at its lower surface and is welded to a projecting portion of a core material for a negative electrode of the electrode plate assembly (5) at its upper surface; a metal case (7) for accommodating the electrode plate assembly (5) to which the positive and negative electrode collectors (10, 11) are jointed, so as to arrange the negative electrode collector (11) down, the projections (12) of the negative electrode collector (11) being welded to an inner bottom surface of the metal case (7); an electrolyte poured into the metal case (7); and a sealing member (9), electrically insulated from the metal case (7), for sealing a top of the metal case (7), wherein the projections (12) of the negative electrode collector (11) are arranged at a plurality of locations in a region between a portion opposed to a hollow cylindrical portion (5a) of the electrode plate assembly (5) and a peripheral portion. Thus, it is possible to provide the cylindrical battery that is favorable when large current discharge is performed and that has high pressure resistance of the metal case.

Claims

1-10. -10. (canceled)

11. A method for manufacturing a cylindrical battery, comprising the steps of:

forming an electrode plate assembly by spirally winding a positive electrode plate and a negative electrode plate with a separator interposed therebetween in such a manner that core materials of the positive and negative electrode plates project to opposite sides to each other in a width direction of the positive and negative electrode plates;

welding a collector to a projecting portion of one of the core materials of the electrode plate assembly;

forming surrounding projections projecting downward on another collector at a plurality of locations in a region between a portion opposed to a hollow cylindrical portion of the electrode plate assembly and a peripheral portion, and forming a central projection having lower height than the surrounding projections on the other collector at the portion opposed to the hollow cylindrical portion;

welding an upper surface of the other collector to a projecting portion of the other core material of the electrode plate assembly;

accommodating the electrode plate assembly in a metal case;

welding the plurality of projections of the other collector and the metal case to each other;

pouring an electrolyte into the metal case; and

sealing a top of the metal case with a sealing member having a cap that also serves as an input and output terminal, while the sealing member is electrically insulated from the metal case, wherein

in the step of welding the plurality of projections of the other collector and the metal case to each other, the electrode plate assembly and the metal case are brought into close contact with each other by application of a pressure, and resistance welding is performed using a welding electrode bar inserted into the hollow cylindrical portion of the electrode plate assembly and a welding electrode brought into contact with a bottom of the metal case.

15. A cylindrical battery manufactured by using the method according to claim 11.

12. A method for manufacturing a cylindrical battery, comprising the steps of:

forming an electrode plate assembly by spirally winding a positive electrode plate and a negative electrode plate with a separator interposed therebetween in such a manner that core materials of the positive and negative electrode plates project to opposite sides to each other in a width direction of the positive and negative electrode plates;

welding a collector to a projecting portion of one of the core materials of the electrode plate assembly;

forming surrounding projections projecting downward on another collector at a plurality of locations in a region between a portion opposed to a hollow cylindrical portion of the electrode plate assembly and a peripheral portion, and forming a central projection on the collector at the portion opposed to the hollow cylindrical portion;

welding an upper surface of the other collector to a projecting portion of the other core material of the electrode plate assembly;

accommodating the electrode plate assembly in a metal case;

welding the plurality of projections of the other collector and the metal case to each other;

pouring an electrolyte into the metal case; and

sealing a top of the metal case with a sealing member having a cap that also serves as an input and output terminal, while the sealing member is electrically insulated from the metal case, wherein

in the step of welding the plurality of projections of the other collector and the metal case to each other, the electrode plate assembly and the metal case are brought into close contact with each other by application of a pressure, and resistance welding is performed using a welding electrode bar inserted into the hollow cylindrical portion of the electrode plate assembly and a ring-like welding electrode arranged to be in contact with portions on the bottom of the metal case that correspond to the surrounding projections.

16. A cylindrical battery manufactured by using the method according to claim 12.

13. A method for manufacturing a cylindrical battery, comprising the steps of:

forming an electrode plate assembly by spirally winding a positive electrode plate and a negative electrode plate with a separator interposed therebetween in such a manner that core materials of the positive and negative electrode plates project to opposite sides to each other in a width direction of the positive and negative electrode plates;

welding a collector to a projecting portion of one of the core materials of the electrode plate assembly;

welding another collector to a projecting portion of the other core material of the electrode plate assembly;

forming surrounding projections projecting inwardly on a bottom of a metal case at a plurality of locations in a region between a portion opposed to a hollow cylindrical portion of the electrode plate assembly and a peripheral portion, and forming a central projection having lower height than the surrounding projections on the bottom of the metal case at the portion corresponding to the hollow cylindrical portion;

accommodating the electrode plate assembly in the metal case;

welding the other collector and the plurality of projections of the metal case to each other;

pouring an electrolyte into the metal case; and

sealing a top of the metal case with a sealing member having a cap that also serves as an input and output terminal, while the sealing member is electrically insulated from the metal case, wherein

in the step of welding the other collector and the plurality of projections of the metal case to each other, the electrode plate assembly and the metal case are brought into close contact with each other by application of a pressure, and resistance welding is performed using a welding electrode bar inserted into the hollow cylindrical portion of the electrode plate assembly and a welding electrode arranged to be in contact with the bottom of the metal case.

17. A cylindrical battery manufactured by using the method according to claim 13.

14. A method for manufacturing a cylindrical battery comprising the steps of:

forming an electrode plate assembly by spirally winding a positive electrode plate and a negative electrode plate with a separator interposed therebetween in such a manner that core materials of the positive and negative electrode plates project to opposite sides to each other in a width direction of the positive and negative electrode plates;

welding a collector to a projecting portion of one of the core materials of the electrode plate assembly;

welding another collector to a projecting portion of the other core material of the electrode plate assembly;

forming surrounding projections projecting inwardly on a bottom of a metal case at a plurality of locations in a region between a portion opposed to a hollow cylindrical portion of the electrode plate assembly and a peripheral portion, and forming a central projection on the bottom of the metal case at the portion corresponding to the hollow cylindrical portion;

accommodating the electrode plate assembly in the metal case;

welding the other collector and the plurality of projections of the metal case to each other;

pouring an electrolyte into the metal case; and

sealing a top of the metal case with a sealing member having a cap that also serves as an input and output terminal, while the sealing member is electrically insulated from the metal case, wherein

in the step of welding the other collector and the plurality of projections of the metal case to each other, the electrode plate assembly and the metal case are brought into close contact with each other by application of a pressure, and resistance welding is performed using a welding electrode bar inserted into the hollow cylindrical portion of the electrode plate assembly and a ring-like welding electrode arranged to be in contact with portions on the bottom of the metal case that correspond to the surrounding projections.

18. A cylindrical battery manufactured by using the method according to claim 14.