Charging method and charger
AssigneeSanyo Electric Co., Ltd.
InventorsTatehito Yagi, Takahiro Yamashita
Life of this patent
Estimating the term…
Abstract
In the invention, a plurality of batteries are connected in parallel with each other and are charged, and −ΔV of a drop of a battery voltage from a peak voltage is detected to judge full charge, and currents flowing to the batteries connected in parallel are detected in the state where charging is stopped by the drop of −ΔV. When the currents flowing to all the batteries are larger than a set current in the state where charging is stopped, it is judged that full charge is not attained and charging is resumed, and when the currents are smaller than the set current, it is judged that all the batteries are fully charged.
Claims13
A charging method comprising the steps of:
- connecting a plurality of batteries in parallel with each other and charging them;
- detecting a battery voltage under charging;
- detecting −ΔV by which the battery voltage is lowered from a peak voltage and judging full charge;
- and
- stopping charging after the full charge is detected through −ΔV, detecting currents flowing to the batteries connected in parallel in a state where charging is stopped, judging that the batteries are not fully charged when the battery current is larger than a set current, and resuming recharging.
A charger comprising:
- a charging power source portion for charging a plurality of batteries connected in parallel with each;
- a charging switch for connecting the charging power source portion to the batteries connected in parallel;
- current detection portions for detecting currents of the batteries connected in parallel;
- and
- a charging control portion for controlling the charging switch so as to turn it on or off by detecting battery voltages,
- wherein the charging control portion detects −ΔV of a drop of the battery voltage from a peak voltage and detects full charge, and in a state where the charging switch is turned off, a full charge state of the batteries is again detected through a current value of the current detection portions.
Dependencies are inferred from the claim text.