Battery charger capable of evaluating battery charge state

Details Battery charger capable of evaluating battery charge state Battery charger capable of evaluating battery charge state

1999-12-06

2000-12-12

Tso, Edward H.

Electricity: battery or capacitor charging or discharging

Serially connected batteries or cells

320734, H01M 1044, H01M 1046

Patent

active

061603767

ABSTRACT:
A battery charger (20) for charging batteries that evaluates the post-charge state of the batteries. A load resistor (70) and a temperature sensor (286) are associated with each battery. After the charging of the battery, a processor (124) receives signals indicating the voltage-at-load of the battery when it is connected to the load resistor and the battery temperature. A memory (282) internal to the battery stores historical voltage-at-load data for the battery. The processor based, the voltage-at-load, the battery temperature and the historical voltage-at-load data for the battery determines an average voltage-at-load for the battery. Based on the average voltage-at-load and data specific to that battery, the processor determines the charge state of the battery. Data representative of the charge state is presented on a display (30) integral with the charger. Data useful for determining both the average voltage-at-load and the charge state for the battery are found in a memory (70) in a module that is removably attached to the charger or in the battery memory (282).

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