Protection circuit and battery unit

Details Protection circuit and battery unit Protection circuit and battery unit

1997-12-01

2000-04-18

Tso, Edward H.

Electricity: battery or capacitor charging or discharging

Serially connected batteries or cells

Having variable number of cells or batteries in series

320120, H02J 700

Patent

active

06051955&

ABSTRACT:
A protection circuit is used for a battery unit which has a plurality of cell parts coupled in parallel, and first and second power supplying terminals, where each of the cell parts includes a plurality of battery cells coupled in series, and first and second terminals respectively coupled to the first and second power supplying terminals. The protection circuit includes a plurality of switching elements making an electrical connection to the first terminal of a corresponding one of the cell parts and the first power supplying terminal, and disconnecting the electrical connection in response to an active signal, and a voltage monitoring circuit outputting the active signal to the switching elements when a voltage of at least one battery cell within one cell part falls outside a predetermined range, independently with respect to each of the cell parts.

REFERENCES:
patent: 5302902 (1994-04-01), Groehl
patent: 5304915 (1994-04-01), Sanpei et al.
patent: 5547775 (1996-08-01), Eguchi et al.
patent: 5602481 (1997-02-01), Fukuyama
patent: 5610495 (1997-03-01), Yee et al.
patent: 5617010 (1997-04-01), Higashijima et al.
patent: 5652501 (1997-07-01), McClure et al.
"Gestion De Patteries Lithium-Ion" Electronique, No. 56, Feb. 1, 1996, p. 80.

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