Electrode structure for non-aqueous electrolyte secondary battery, method for producing the same, and non-aqueous electrolyte secondary battery

• US 8,530,084 B2
• Filed: 06/24/2009
• Issued: 09/10/2013
• Est. Priority Date: 06/25/2008
• Status: Expired due to Fees

• Current Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Inventors: Katayama, Hitoshi, Nonoshita, Takashi, Kasamatsu, Takeshi, Imashiku, Shoichi, Kato, Seiichi, Sumihara, Masanori
• Primary Examiner(s): Ruddock, Ula C
• Assistant Examiner(s): Chmielecki, Scott J
• Application Number:
  US12/811,487
• Publication Number:
  US 20100285353A1
• Time in Patent Office: 1,539 Days
• Field of Search: 429/161, 429/238, 429/209, 429/211
• US Class Current: 429/211
• CPC Class Codes: H01M 10/052 Li-accumulators
• CPC Class Codes: H01M 10/058 Construction or manufacture
• CPC Class Codes: H01M 4/70 characterised by shape or form
• CPC Class Codes: H01M 4/742 perforated material
• CPC Class Codes: H01M 50/533 characterised by the shape of the leads or tabs
• CPC Class Codes: H01M 50/534 characterised by the material of the leads or tabs
• 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 29/49108 Electric battery cell making

Abstract

An electrode 13 has an active material layer 12 formed on each of two whole main surfaces of a current collector 11. A part of an electrode lead 14 overlaps the electrode 13. One end face of the electrode 13 in the width direction of the electrode 13 is flush with one end face of the electrode lead 14. Joints 15 are formed at the one end of the electrode 13 in the width direction. The joints 15 join the electrode 13 and the electrode lead 14 so as to provide electrical continuity between the exposed part of the current collector 11 at the one end face of the electrode 13 in the width direction and the electrode lead 14. The joints 15 are formed, for example, by plasma welding.

Claims

1. An electrode structure for a non-aqueous electrolyte secondary battery, comprising:

an electrode including a rectangular-shaped current collector with two main surfaces and an active material layer formed on each of the main surfaces of the current collector, the current collector comprising a metal foil and having an exposed part at one end along a long side of the electrode;

an electrode lead; and

a joint for joining the electrode and the electrode lead so as to provide electrical continuity between the exposed part and the electrode lead,

wherein the electrode lead has a part overlapping the electrode and one end face which is disposed so as to be flush with an end face of the electrode at the one end along the long side, and

the joint is formed so as to extend over the end face of the electrode at the one end and the one end face of the electrode lead.

2. The electrode structure for a non-aqueous electrolyte secondary battery in accordance with claim 1, further comprising an additional joint formed at the other end along another long side of the electrode.

3. The electrode structure for a non-aqueous electrolyte secondary battery in accordance with claim 2,

wherein the electrode lead has a step that is formed so as to be flush with an end face of the electrode at the other end, and

the joint formed at the other end joins the other end of the electrode and the step of the electrode lead.

4. The electrode structure for a non-aqueous electrolyte secondary battery in accordance with claim 1,

wherein the electrode lead is affixed to the other end of the electrode with adhesive tape.

7. A non-aqueous electrolyte secondary battery comprising:

an electrode assembly comprising a positive electrode and a negative electrode which are wound or layered with a separator interposed therebetween, each of the positive and negative electrodes being rectangular-shaped;

an electrode lead joined to the positive electrode and an electrode lead joined to the negative electrode;

a non-aqueous electrolyte;

a battery case housing the electrode assembly and the non-aqueous electrolyte; and

a seal member sealing an opening of the battery case,

wherein at least one of an electrode structure comprising the electrode lead joined to the positive electrode and an electrode structure comprising the electrode lead joined to the negative electrode is the electrode structure of claim 1 for a non-aqueous electrolyte secondary battery.

5. An electrode structure for a non-aqueous electrolyte secondary battery, comprising:

an electrode including a rectangular-shaped current collector with two main surfaces and an active material layer formed on each of the main surfaces of the current collector, the current collector comprising a metal foil and having an exposed part at one end along a short side of the electrode;

an electrode lead; and

a joint for joining the electrode and the electrode lead so as to provide electrical continuity between the exposed part and the electrode lead,

wherein the electrode lead has a part overlapping the electrode and one end face which is disposed so as to be flush with an end face of the electrode at the one end along the short side, and

the joint is formed so as to extend over the end face of the electrode at the one end and the one end face of the electrode lead.

6. The electrode structure for a non-aqueous electrolyte secondary battery in accordance with claim 5,

wherein the other end of the electrode lead is affixed to the electrode with adhesive tape.