Circuit and method of monitoring battery cells

Details Circuit and method of monitoring battery cells Circuit and method of monitoring battery cells

1994-06-20

1997-03-11

Tso, Edward H.

Electricity: battery or capacitor charging or discharging

Serially connected batteries or cells

With discharge of cells or batteries

320 39, H01M 1044, H01M 1046

Patent

active

056104952

ABSTRACT:
A battery monitoring circuit (10) sequentially samples individual voltages across a string of serially coupled battery cells (12-18). A control circuit (32) controls first and second multiplexers (34,42) to sample each battery voltage for an over-voltage condition. A comparator (52) detects an over-voltage condition by comparing a divided down battery voltage against a reference. The conduction path through the battery cells is disabled upon detecting a fault condition by a transistor (26) in the battery cell conduction path. The battery cells are further sequentially sampled for an under-voltage fault. The comparator detects an under-voltage condition by comparing a second divided down battery voltage against the reference. The conduction path through the battery cells is disabled upon detecting a fault condition by a transistor (24) in the battery cell conduction path.

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patent: 4217645 (1980-08-01), Barry et al.
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patent: 4385269 (1983-05-01), Aspinwall et al.
patent: 5119011 (1992-06-01), Lambert
patent: 5153496 (1992-10-01), LaForge
patent: 5206578 (1993-04-01), Nor
patent: 5245268 (1993-09-01), Wang
patent: 5352968 (1994-10-01), Reni et al.
patent: 5504415 (1996-04-01), Podrazhansky et al.

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