Flat plate sealed lead-acid battery charging system and method

Details Flat plate sealed lead-acid battery charging system and method Flat plate sealed lead-acid battery charging system and method

1988-12-09

1992-09-22

Hickey, R. J.

Electricity: battery or capacitor charging or discharging

Serially connected batteries or cells

With discharge of cells or batteries

320 35, 429 7, H02J 704, H02H 504

Patent

active

051500337

ABSTRACT:
A preferred protective current limiter comprises a positive temperature coefficient (PTC) resistor which automatically assumes a relatively high impedance state quickly enough to prevent venting of flat plate lead acid batteries under adverse charging conditions. For example, a fast charger with unlimited current and sixteen volt DC output (such as may be provided by a faulty vehicle electrical system) is found to cause venting without the limiter, while a PTC resistor selected according to the present disclosure safeguards the battery against venting while yet conducting a sufficiently high current to essentially equalize the charge condition of the battery cells within five minutes or less. Preferably a bypass resistor shunts the PTC resistor to avoid any problem which might arise if the PTC resistor became sufficiently heated to assume a current blocking state. At any given charging rate, the shunt resistor shares the total current, tending to moderate the heating of the PTC resistor, and leading to a more efficient charging of the battery after the initial cell equalization phase.

REFERENCES:
patent: 4092580 (1978-05-01), Prinze
patent: 4255698 (1981-03-01), Simon
Electronic Design (MAG.) "Schottky Diodes Rectify Efficiently in a Bicycle-lighting System" p. 92, Jul. 5, 1977.

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