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Patent Searching and Data


Title:
SECONDARY BATTERY WITH PROTECTIVE CIRCUIT
Document Type and Number:
WIPO Patent Application WO/2004/034542
Kind Code:
A1
Abstract:
A secondary battery (101) arranged such that a thermal element (133) exhibiting a resistance changing dependent on temperature variation is removed from a passage that the charge/discharge current of a power storage unit (111) runs, an auxiliary switch element (122) is conducted by variation in the resistance of the thermal element (114) caused by heat generated when the main switch element (114) is heated with an overcurrent, and first and second auxiliary fuse elements (135a, 135b) are blown out. A high efficiency is ensured because power is not consumed in the thermal element (133) by the charge/discharge current. Furthermore, the size can be reduced because a thermal element (133) having a low current capacity can be employed.

Inventors:
FURUTA KAZUTAKA (JP)
KAWAZU MASAMI (JP)
Application Number:
PCT/JP2003/012768
Publication Date:
April 22, 2004
Filing Date:
October 06, 2003
Export Citation:
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Assignee:
SONY CHEMICALS CORP (JP)
FURUTA KAZUTAKA (JP)
KAWAZU MASAMI (JP)
International Classes:
H01M2/34; H01M10/44; H02H5/04; H02H7/18; H02J7/00; (IPC1-7): H02H7/18
Foreign References:
JP2002281660A2002-09-27
EP0982826A22000-03-01
JP2002017040A2002-01-18
Other References:
See also references of EP 1551088A4
Attorney, Agent or Firm:
Ishijima, Shigeo (Toranomonkougyou Bldg. 3F, 2-18 Toranomon 1-chom, Minato-ku Tokyo, 105-0001, JP)
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