Patent ID: 6191560
Filing Date: 2001-02-20
Classification: H02J

Abstract:
A battery charger comprising:a storage device storing a map, in which an allowable current value, with which a battery can be charged while a temperature rise of the battery is being suppressed, is mapped based on a battery temperature value and a battery temperature rise value;temperature detecting means for detecting a present battery temperature;temperature rise value outputting means for obtaining the temperature rise value from the temperature detected by said temperature detecting means;charging state determining means for detecting a battery voltage and determining whether a battery state is in a final charging period based on change of the battery voltage;allowable current value retrieving means for retrieving the map corresponding to the battery charger temperature, based on the temperature detected by said temperature detecting means and the temperature rise value outputted from said temperature rise value outputting means, and for obtaining said allowable current value, the allowable current value retrieving means obtaining a relatively high allowable value if it is determined that the battery state is not in the final charging period by said charging state determining means; andcharging means for charging the battery with the allowable current value retrieved by said allowable current value retrieving means.