High-capacity secondary battery of jelly roll type

Claim 2

A cylindrical secondary battery according to claim 1, further comprising a gas release valve mounted on at least one of said caps for discharging a pressure from said cylindrical casing when a pressure buildup in said cylindrical casing exceeds a predetermined pressure level.

Claim 3

A cylindrical secondary battery according to claim 1, wherein each of said positive and negative terminals has a disk, said rectangular leads being connected to said disk.

Claim 4

A cylindrical secondary battery according to claim 1, wherein said positive and negative terminals are connected to said rectangular leads by laser beam welding.

Claim 5

A cylindrical secondary battery according to claim 1, wherein said positive and negative terminals are connected to said rectangular leads by ultrasonic welding.

Claim 6

A cylindrical secondary battery comprising: a spirally coiled electrode assembly having positive and negative electrodes each including a web-like collector coated with an active material on opposite surfaces thereof, and separators disposed between said positive and negative electrodes; a plurality of leads extending from opposite sides of the web-like collectors in directions perpendicular to a direction in which the positive and negative electrodes and the separators are wound, said rectangular leads having a loosened portion; positive and negative terminals connected to said leads extending from the respective opposite sides of the web-like collectors; a cylindrical casing housing said spirally coiled electrode assembly, said leads, and said positive and negative terminals; and a pair of caps mounted on respective opposite ends of said cylindrical casing, said positive and negative terminals being fixed to said caps, respectively.

Claim 7

A cylindrical secondary battery according to claim 6, wherein said leads comprise a plurality of rectangular leads spaced at a predetermined interval.

Claim 8

A cylindrical secondary battery according to claim 6, further comprising a gas release valve mounted on at least one of said caps for discharging a pressure from said cylindrical casing when a pressure buildup in said cylindrical casing exceeds a predetermined pressure level.

Claim 9

A cylindrical secondary battery comprising: a spirally coiled electrode assembly having positive and negative electrodes each including a coated active material, separators disposed between said positive and negative electrodes, and a core, said positive and negative electrodes and said separators being wound around said core; a plurality of leads extending from uncoated areas of said positive and negative electrodes along full lengths thereof; positive and negative terminals having respective disks each having gas release holes, said leads being welded to outer circumferential surfaces of said disks substantially fully therealong; and insulating collars electrically insulating said core from said disks and having gas release holes contiguous to said gas release holes defined in said disks.

Claim 10

A cylindrical secondary battery according to claim 9, wherein said leads comprise rectangular leads.

Claim 11

A cylindrical secondary battery according to claim 9, wherein said gas release holes are defined in each of said disks around a central axis thereof at equally angularly spaced intervals.

Claim 12

A cylindrical secondary battery according to claim 9, further comprising a gas release valve mounted on at least one of said caps for discharging a pressure from said cylindrical casing when a pressure buildup in said cylindrical casing exceeds a predetermined pressure level.

Claim 13

A cylindrical secondary battery according to claim 9, wherein said leads have a predetermined loosened portion.

Claim 14

A cylindrical secondary battery comprising: a terminal having a disk and a stud projecting axially from said disk, said disk having an off-center hole defined therein, said stud having an externally threaded surface and an internally threaded central hole; a cap fastened between said disk and a nut which is threaded over said externally threaded surface; a bolt threaded into said internally threaded central hole for sandwiching a conductor between a head of the bolt and an end of said stud; a stopper pin having an end portion fixed to said cap and an opposite end portion fitted in said off-center hole in said disk; and an insulating collar fitted over said opposite end portion of said stopper pin for electrically insulating said cap from said disk.

Claim 15

A cylindrical secondary battery comprising: a spirally coiled electrode assembly having positive and negative electrodes each including a web-like collector coated with an active material on opposite surfaces thereof, and separators disposed between said positive and negative electrodes; a plurality of leads extending from opposite sides of the web-like collectors in directions perpendicular to a direction in which the positive and negative electrodes and the separators are wound; positive and negative terminals connected to said leads extending from the respective opposite sides of the web-like collectors; a cylindrical casing housing said spirally coiled electrode assembly, said leads, and said positive and negative terminals; a pair of caps mounted on respective opposite ends of said cylindrical casing, said positive and negative terminals being fixed to said caps, respectively; each of said positive and negative terminals having a disk and a stud projecting axially from said disk, said disk having an off-center hole defined therein, said stud having an externally threaded surface and an internally threaded central hole; each of said caps being fastened between said disk and a nut which is threaded over said externally threaded surface; a bolt threaded into said internally threaded central hole for sandwiching a conductor between a head of the bolt and an end of said stud; a stopper pin having an end portion fixed to each of said caps and an opposite end portion fitted in said off-center hole in said disk; and an insulating collar fitted over said opposite end portion of said stopper pin for electrically insulating said cap from said disk.

Claim 16

A cylindrical secondary battery according to claim 15, wherein said leads comprise rectangular leads.

Claim 17

A cylindrical secondary battery according to claim 15, further comprising a gas release valve mounted on at least one of said caps for discharging a pressure from said cylindrical casing when a pressure buildup in said cylindrical casing exceeds a predetermined pressure level.

Claim 18

A cylindrical secondary battery according to claim 15, wherein said leads have a predetermined loosened portion.