Nonaqueous electrolyte secondary battery, vehicle, and device using battery

Patent metadata

Field	Value
Publication number	US-9368837-B2
Application number	US-201213613485-A
Country	US
Kind code	B2
Filing date	Sep 13, 2012
Priority date	May 18, 2010
Publication date	Jun 14, 2016
Grant date	Jun 14, 2016

Abstract

Disclosed is a nonaqueous electrolyte secondary battery which comprises a flat wound electrode body wherein a positive electrode plate, which comprises a positive electrode collector foil and a positive electrode active material layer, and a negative electrode plate, which comprises a negative electrode collector foil and a negative electrode active material layer, are wound up with a separator being interposed therebetween. The positive electrode plate has a collector cover layer that has electrical insulation properties and covers at least a part of a facing collector portion in the longitudinal direction in a positive electrode collector portion. The collector cover layer covers at least an innermost semi-cylindrical facing collector portion which forms the innermost part of the facing collector portion and has a half-cylindrical shape.

First claim

The invention claimed is:

1. Nonaqueous electrolyte secondary battery including:
a flat wound electrode body having:
an elongated positive electrode plate with a positive electrode active material layer formed in part of an elongated positive electrode collector foil, the positive electrode plate having a longitudinally extending strip-shaped positive electrode portion where the positive electrode active material layer is present in a thickness direction thereof and a longitudinally extending strip-shaped positive electrode collector portion located at one end in a width direction of the positive electrode plate where the positive electrode active material layer is not present in the thickness direction thereof;
an elongated negative electrode plate with a negative electrode active material layer formed in part of an elongated negative electrode collector foil, the negative electrode plate having a longitudinally extending strip-shaped negative electrode portion where the negative electrode active material layer is present in a thickness direction thereof and a longitudinally extending strip-shaped negative electrode collector portion located at one end in a width direction of the negative electrode plate where the negative electrode active material layer is not present in the thickness direction thereof; and
an elongated separator,

the positive electrode plate and the negative electrode plate being overlapped upon one another via the separator and wound around an axis line into a flat shape, wherein
the positive electrode collector portion of the positive electrode plate includes, in the flat wound electrode body configuration, a facing collector portion adjacent to one side in a direction along the axis line of the positive electrode portion and facing the negative electrode portion of the negative electrode plate, and
the positive electrode plate includes a collector cover layer having electrical insulation properties and covering only a portion in the longitudinal direction of the positive electrode collector portion, the collector cover layer covering at least an innermost semi-cylindrical facing collector portion located innermost of the facing collector portion and bent into a semi-cylindrical shape.

2. The nonaqueous electrolyte secondary battery according to claim 1 , wherein
the collector cover layer is formed at a location only within N/2 turns counted from inside of the flat wound electrode body where N is the number of turns of winding of the positive electrode plate in the flat wound electrode body.

3. The nonaqueous electrolyte secondary battery according to claim 1 , wherein
the collector cover layer has a thickness larger than or equal to that of the positive electrode active material layer.

4. A vehicle having the nonaqueous electrolyte secondary battery according to claim 1 mounted thereon and using the electrical energy stored in the nonaqueous electrolyte secondary battery as part or all of the driving energy of the driving source.

5. A battery powered equipment having the nonaqueous electrolyte secondary battery according to claim 1 mounted thereon and using the nonaqueous electrolyte secondary battery as at least one of the energy sources.

6. The nonaqueous electrolyte secondary battery according to claim 2 , wherein
the collector cover layer has a thickness larger than or equal to that of the positive electrode active material layer.

7. A vehicle having the nonaqueous electrolyte secondary battery according to claim 2 mounted thereon and using the electrical energy stored in the nonaqueous electrolyte secondary battery as part or all of the driving energy of the driving source.

8. A vehicle having the nonaqueous electrolyte secondary battery according to claim 3 mounted thereon and using the electrical energy stored in the nonaqueous electrolyte secondary battery as part or all of the driving energy of the driving source.

9. A battery powered equipment having the nonaqueous electrolyte secondary battery according to claim 2 mounted thereon and using the nonaqueous electrolyte secondary battery as at least one of the energy sources.

10. A battery powered equipment having the nonaqueous electrolyte secondary battery according to claim 3 mounted thereon and using the nonaqueous electrolyte secondary battery as at least one of the energy sources.

Assignees

• Saito Taira
• Suzuki Satoru
• Toyota Motor Co Ltd

Inventors

• Saito Taira
• Suzuki Satoru

Classifications

• H01M2220/30

  Batteries in portable systems, e.g. mobile phone, laptop · CPC title

• H01M10/052

  Li-accumulators · CPC title

• H01M10/0587 Primary

  of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators · CPC title

• Y02T10/7011

  Cross-Sectional Technologies · mapped topic

• Y02E60/122

  Cross-Sectional Technologies · mapped topic