Stack type battery

• US 20090197162A1
• Filed: 09/25/2008
• Published: 08/06/2009
• Est. Priority Date: 09/28/2007
• Status: Active Grant

• Current Assignee: Panasonic Energy Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Sanyo Electric Company Limited (Panasonic Holdings Corporation)
• Inventors: Shinyashiki, Yashitaka, Funahashi, Atsuhiro, Maeda, Hitoshi, Fujiwara, Masayuki
• Granted Patent: US 8,119,277 B2
• Time in Patent Office: Days
• US Class Current: 429/161
• CPC Class Codes: H01M 10/0413 Large-sized flat cells or batteries for motive or stationary systems with plate-like electrodes
• CPC Class Codes: H01M 50/466 U-shaped, bag-shaped or folded
• CPC Class Codes: H01M 50/528 Fixed electrical connections, i.e. not intended for disconnection
• CPC Class Codes: H01M 50/534 characterised by the material 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 50/54 Connection of several leads or tabs of plate-like electrode stacks, e.g. electrode pole straps or bridges
• 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 stack type battery has positive electrode current collector tabs (11) overlapped with each other and welded to a positive electrode current collector terminal (15), and negative electrode current collector tabs (12) overlapped with each other and welded to a negative electrode current collector terminal (16). The positive electrode current collector tabs (11) existing between the positive electrode plates (1) and an end part (15a) of the positive electrode current collector terminal (15) that is on the positive electrode plate (1) side are welded to each other and/or the negative electrode current collector tabs (12) existing between the negative electrode plates (2) and an end part (16a) of the negative electrode current collector terminal (16) that is on a negative electrode plate (2) side are welded to each other.

Claims

1. A stack type battery comprising:

a stacked electrode assembly having a plurality of positive electrode plates, a plurality of negative electrode plates, and separators, the positive electrode plates and the negative electrode plates being alternately stacked one upon the other with the separators interposed therebetween;

positive electrode current collector tabs each made of a metal foil and extending outward from the plurality of positive electrode plates;

negative electrode current collector tabs each made of a metal foil and extending outward from the plurality of negative electrode plates;

a plate-shaped positive electrode current collector terminal; and

a plate-shaped negative electrode current collector terminal,

the positive electrode current collector tabs being overlapped with each other and welded to the plate-shaped positive electrode current collector terminal, and the negative electrode current collector tabs being overlapped with each other and welded to a plate-shaped negative electrode current collector terminal, wherein

the positive electrode current collector tabs existing between the positive electrode plates and an end part of the positive electrode current collector terminal that is on the positive electrode plate side are joined to each other, and/or the negative electrode current collector tabs existing between the negative electrode plates and an end part of the negative electrode current collector terminal that is on the negative electrode plate side are joined to each other.

2. The stack type battery according to claim 1, wherein the number of each of the positive electrode plates and the negative electrode plates is 30 or greater.

3. The stack type battery according to claim 1, wherein the joining is effected by ultrasonic welding.

4. The stack type battery according to claim 1, wherein the joining is effected by thrust-and-press clamping.

5. The stack type battery according to claim 1, wherein the joining is effected at a substantially halfway location between the positive electrode plates and the end part of the positive electrode current collector terminal that is on the positive electrode plate side and/or at a substantially halfway location between the negative electrode plates and the end part of the negative electrode current collector terminal that is on the negative electrode plate side.

6. The stack type battery according to claim 1, wherein the joining is effected at a plurality of locations.

7. The stack type battery according to claim 6, wherein the plurality of joining locations are disposed linearly so as to be perpendicular to an extending direction of the positive electrode current collector tabs or the negative electrode current collector tabs.

8. The stack type battery according to claim 1, wherein a positive electrode active material of the positive electrode plates and a negative electrode active material used of the negative electrode plates comprise a material capable of intercalating and deintercalating lithium.