Overvoltage disconnect circuit for lithium ion batteries

Details Overvoltage disconnect circuit for lithium ion batteries Overvoltage disconnect circuit for lithium ion batteries

1995-10-16

1997-06-10

Kalafut, Stephen

Chemistry: electrical current producing apparatus, product, and

With nonbattery electrical component electrically connected...

429 61, 320 31, 320 39, H01M 1400

Patent

active

056374135

ABSTRACT:
A lithium ion or similar lithium secondary battery pack (10) includes an overvoltage disconnect circuit having an overvoltage disconnect switch (14), a voltage detector (16), and a delay circuit (18). The battery pack is connectable to a recharger which was not designed to accomodate the charge regime of the lithium ion cell or cells (12), such as a nickel system recharger (20). The voltage detector samples the battery voltage and changes its output signal if the battery voltage reaches an upper voltage threshold. The output of the voltage detector will not revert back until the battery voltage drops to a lower voltage threshold, which is below the upper voltage threshold.

REFERENCES:
patent: 4327317 (1982-04-01), Heine et al.
patent: 4467266 (1984-08-01), Ritchie
patent: 5248927 (1993-09-01), Takei et al.
patent: 5518832 (1996-05-01), Fernandez et al.
patent: 5530336 (1996-06-01), Eguchi et al.
patent: 5539299 (1996-07-01), Fernandez et al.
patent: 5547775 (1996-08-01), Eguchi et al.
patent: 5554919 (1996-09-01), Uchida

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