Battery protection circuit

Electricity: battery or capacitor charging or discharging – Serially connected batteries or cells – With discharge of cells or batteries

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Details

320 9, 320 40, 320 29, H01M 1044

Patent

active

055303366

ABSTRACT:
A battery protection circuit has a condition detecting circuit which detects a voltage across a secondary cell or cells and compares the detected voltage with a reference voltage to detect an overdischarged condition or an overcharged condition of the secondary cell or cells. A control unit controls a first switching element for cutting off a discharging current and a second switching element for cutting off a charging current based on a detected condition of the secondary cell or cells. A third switch element cuts off electric power supplied to the condition detecting circuit. The third switch element is rendered nonconductive when the overdischarged condition is detected by the condition detecting circuit.

REFERENCES:
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patent: 4238721 (1980-12-01), DeLuca et al.
patent: 4595872 (1986-06-01), Ball
patent: 4716354 (1987-12-01), Hacker
patent: 4816736 (1989-03-01), Dougherty et al.
patent: 4965738 (1990-10-01), Bauer et al.
patent: 5028858 (1991-07-01), Schnizler et al.
patent: 5304915 (1994-04-01), Sanpei et al.

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