FLAT NONAQUEOUS SECONDARY BATTERY

Title:

FLAT NONAQUEOUS SECONDARY BATTERY

Document Type and Number:

WIPO Patent Application WO/2011/065344

Kind Code:

A1

Abstract:

Disclosed is a highly safe flat nonaqueous secondary battery. Specifically disclosed is a flat nonaqueous secondary battery (1) which comprises an outer case (2), a top sealing case (3) and an electrode group. The electrode group comprises a plurality of positive electrodes (5) and negative electrodes (6), and separators (7), said positive electrodes (5) and negative electrodes (6) being alternately laminated. Each positive electrode (5) comprises a main body portion (5a) (a positive electrode main body portion) and a collector tab (5b) (a positive electrode collector tab portion). Each separator (7) has a main portion (7a) that covers the main body portion (5a) of the positive electrode (5) and a pendent portion (7b) that covers the boundary portion between the main body portion (5a) and the collector tab (5b) of the positive electrode (5). With respect to the separators (7), the thermal shrinkage ratio in a direction A is larger than the thermal shrinkage ratio in a direction B that is perpendicular to the direction A. Each separator (7) is formed such that the direction B is generally parallel to the direction in which the collector tab (5b) of the positive electrode (5) protrudes from the main body portion (5a). At least a part of the peripheral portion of the main portion (7a) is provided with a bonding portion which is directly welded with another bonding portion.

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Inventors:

TAKAI MEGUMU (JP)

Application Number:

PCT/JP2010/070855

Publication Date:

June 03, 2011

Filing Date:

November 24, 2010

Export Citation:

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Assignee:

HITACHI MAXELL (JP)
TAKAI MEGUMU (JP)

International Classes:

H01M4/13; H01M10/052; H01M10/0566; H01M10/0585; H01M50/417; H01M50/466; H01M50/489; H01M50/54

Domestic Patent References:

WO2003063269A1

2003-07-31

Foreign References:

JP2009224276A	2009-10-01
JP2010212206A	2010-09-24
JP2009242631A	2009-10-22
JP2009231281A	2009-10-08
JP2009084300A	2009-04-23

Attorney, Agent or Firm:

UEBA Hidetoshi et al. (JP)
Hidetoshi Ueha (JP)

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