| 摘要 |
PROBLEM TO BE SOLVED: To provide an internal charging technology which charges secondary batteries well in balance without making a device complicated. SOLUTION: In a step S1, a voltage V1 and a voltage V2 of a battery 1 and a battery 2 are measured and a magnitude correlation between the two voltages are discriminated. As shown in a step S2, the voltage V1 of the battery 1 and the voltage V2 of the battery 2 are measured to be compared with each other. In the case of V1>V2 (YES), since it is estimated that a charged amperehour of the battery 2 is smaller than a charged amperehour of the battery 1, a user proceeds to a step S3, and the battery 2 having the smaller charged amperehour is charged. A process of the step S3 is repeated until a formula V1-V2<Δis satisfied in a step S4, whereΔis a value near zero in a degree that V1 and V2 can be equated with each other. When the formula V1-V2<Δis satisfied (YES) in the step S4, the user proceeds to a step S5, and the battery 1 and the battery 2 are connected in series to be charged. When the charging is finished, the process is completed (step S6). COPYRIGHT: (C)2007,JPO&INPIT
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