Search International and National Patent Collections

1. (WO1999008360) MEMORIZING THE FIRST OPERATING TIME OF A STAND-BY BATTERY AND/OR INDICATING THE END OF A STAND-BY BATTERY LIFETIME

Pub. No.:    WO/1999/008360    International Application No.:    PCT/DE1998/002171
Publication Date: Fri Feb 19 00:59:59 CET 1999 International Filing Date: Thu Jul 30 01:59:59 CEST 1998
IPC: G01R 31/36
H01M 6/50
H01M 10/44
H02J 7/00
Applicants: SIEMENS AKTIENGESELLSCHAFT
FISCHEDICK, Thomas
MÜLLER, Andre
Inventors: FISCHEDICK, Thomas
MÜLLER, Andre
Title: MEMORIZING THE FIRST OPERATING TIME OF A STAND-BY BATTERY AND/OR INDICATING THE END OF A STAND-BY BATTERY LIFETIME
Abstract:
The invention concerns a stand-by battery consisting of an accumulator for ensuring the standby supply of a circuit, in service voltage, coupled with an electrically irreversible element constituted by a fuse, to form a unit. If said irreversible element is its initial state at the time of query, it shifts to its irreversible state and said time is memorized. By fixing without ambiguity the first operating time of the stand-by battery, a change of battery which appears to be required for security reasons before the guaranteed lifetime expires, can be avoided. In a particular embodiment, the irreversible element indicates the time when the stand-by battery reaches the end of its lifetime.