Sealed prismatic battery

• US 20060073382A1
• Filed: 09/29/2005
• Published: 04/06/2006
• Est. Priority Date: 09/29/2004
• Status: Active Grant

• Current Assignee: Hitachi Maxell Energy, Ltd. (Maxell, Ltd.)
• Original Assignee: Hitachi Maxell Limited (Hitachi, Ltd.)
• Inventors: Watanabe, Osamu, Somatomo, Yoshiki, Urano, Kazuaki
• Granted Patent: US 7,666,547 B2
• Time in Patent Office: Days
• US Class Current: 429/161
• CPC Class Codes: H01M 10/0431 Cells with wound or folded electrodes H01M10/045 takes precedence
• 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 50/147 Lids or covers
• CPC Class Codes: H01M 50/15 for prismatic or rectangular cells H01M50/153 takes precedence
• CPC Class Codes: H01M 50/50 Current conducting connections for cells or batteries
• CPC Class Codes: H01M 50/593 Spacers; Insulating plates
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

A lid 3 that closes the upper surface of the opening of a closed-bottom prismatic tubular battery can 1, an electrode body 2 accommodated in the battery can 1, a negative terminal 12 penetratively fastened to the lid 3, an insulating plate 11 placed on the lower surface side of the lid 3, a lead plate 17 placed on the lower surface side of the insulating plate 11, and a negative electrode current collector lead 7 led upwardly of the electrode body 2 are included. The upper end portion of the current collector lead 7 is welded to the lower surface of the lead plate 17 and bent in a position located rather closer to the front wall of the battery can 1. The insulating plate 11 has a lid side insulating portion 22 held between the lid 3 and the lead plate 17 and a front sidewall 25 that extends downwardly from the-front end side of the lid side insulating portion 22. In a free state before the battery is assembled, the lid side insulating portion 22 and the sidewall 25 of the insulating plate 11 extend roughly straightly.

Claims

1. A sealed prismatic battery having a closed-bottom prismatic tubular battery can that has an opening at its upper surface, a lid that closes the upper surface of the opening of the battery can, an electrode body accommodated in the battery can, an output terminal penetratively fastened to the lid, an insulator that is placed on a lower surface side of the lid and insulates the output terminal at least from the lower surface of the lid, a plate-shaped lead plate that is placed on a lower surface side of the insulator and connected to a lower end of the output terminal, and a thin-plate-shaped current collector lead led upwardly of the electrode body,

the current collector lead having an upper end portion welded to a lower surface of the lead plate in a surface contact state and the current collector lead being bent at least in a position located rather closer to a front wall of the battery can, wherein

the insulator comprises:

a lid side insulating portion held between the lid and the lead plate; and

a sidewall that extends downwardly at least from a front end side of front and rear ends of the lid side insulating portion, and

the lid side insulating portion and the sidewall extend roughly straightly in a free state before the battery is assembled.

2. The sealed prismatic battery as claimed in claim 1, wherein

the insulator has a groove or a thin film portion to be downwardly bent at a boundary between the lid side insulating portion and the sidewall.

3. The sealed prismatic battery as claimed in claim 1, wherein

a thin-plate-shaped insulating plate made of a material that has a high rigidity is placed on an upper side of the electrode body, and

the current collector lead is led to the lead plate through a through hole provided at the insulating plate.

6. The sealed prismatic battery as claimed in claim 1, wherein

a lower portion of the current collector lead is covered with an insulating member.

4. A sealed prismatic battery having a closed-bottom prismatic tubular battery can that has an opening at its upper surface, a lid that closes the upper surface of the opening of the battery can, an electrode body accommodated in the battery can, an output terminal penetratively fastened to the lid, an insulator that is placed on a lower surface side of the lid and insulates the output terminal at least from the lower surface of the lid, a plate-shaped lead plate that is placed on a lower surface side of the insulator and connected to a lower end of the output terminal, and a thin-plate-shaped current collector lead led upwardly of the electrode body,

the current collector lead having an upper end portion welded to a lower surface of the lead plate in a surface contact state and the current collector lead being bent at least in a position located rather closer to a front wall of the battery can, wherein

the insulator comprises:

a lid side insulating portion held between the lid and the lead plate;

a sidewall that is downwardly bent at least from a front end side of front and rear ends of the lid side insulating portion; and

an electrode side insulating portion that extends from a lower end of the sidewall toward a center in a front-and-back direction of the battery, and

the lid side insulating portion and the sidewall extend roughly straightly in a free state before the battery is assembled.

5. A sealed prismatic battery having a closed-bottom prismatic tubular battery can that has an opening at its upper surface, a lid that closes the upper surface of the opening of the battery can, an electrode body accommodated in the battery can, an output terminal penetratively fastened to the lid, an insulator that is placed on a lower surface side of the lid and insulates the output terminal at least from the lower surface of the lid, a plate-shaped lead plate that is placed on a lower surface side of the insulator and connected to a lower end of the output terminal, and a thin-plate-shaped current collector lead led upwardly of the electrode body,

the current collector lead having an upper end portion welded to a lower surface of the lead plate in a surface contact state and the current collector lead being bent at least in a position located rather closer to a front wall of the battery can, wherein

the insulator comprises:

a lid side insulating portion held between the lid and the lead plate;

an electrode side insulating portion that is placed on an upper side of the electrode body; and

a thin plate portion that has a flexibility and connects the lid side insulating portion with the electrode side insulating portion, and

the insulator is located closer to a front wall of the battery can than the current collector lead, and the electrode side insulating portion has a projection that upwardly projects on its upper surface.