SECONDARY BATTERY WITH PROTECTIVE CIRCUIT

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:

JP2002281660A	2002-09-27
EP0982826A2	2000-03-01
JP2002017040A	2002-01-18

Other References: