Apparatus for connecting secondary battery cells in series and method for controlling secondary battery cells connected in series

A method for controlling a first secondary battery cell and a second secondary battery cell that are connected in series, comprising the steps of:

• connecting the first secondary battery cell and a first capacitor in parallel, a first electrode of the first secondary battery cell not being connected to a ground potential;
• and
• connecting the first capacitor and a second capacitor in parallel, a first terminal of the second capacitor being connected to the ground potential,
• wherein a voltage is taken out of the second capacitor.

An apparatus for connecting a first secondary battery cell and a second secondary battery cell in series, comprising:

• first connecting means for connecting the first secondary battery cell and a capacitor in parallel;
• second connecting means for connecting the second secondary battery cell and the capacitor in parallel;
• and
• third connecting means for connecting a first terminal of the capacitor to a ground terminal,
• wherein while the first terminal of the capacitor is connected to the ground terminal by the third connecting means, a voltage is taken out of the capacitor.

A method for connecting a first secondary battery cell and a second secondary battery cell that are connected in series, comprising the steps of:

• connecting the first secondary battery cell and a capacitor in parallel;
• connecting the second secondary battery cell and the capacitor in parallel;
• and
• connecting a first terminal of the capacitor to a ground terminal,
• wherein while the first terminal of the capacitor is connected to the ground terminal at the third connecting step, a voltage is taken out of the capacitor.

An apparatus for connecting a first secondary battery cell and a second secondary battery cell in series and for charging the first secondary battery cell and the second secondary battery cell, comprising:

• first connecting means for connecting a charging power supply and a capacitor in parallel, a first terminal of the capacitor being connected to a ground potential;
• and
• second connecting means for connecting one selected from the first secondary battery cell and the second secondary battery cell and the capacitor in parallel,
• wherein the charging power supply and the capacitor are connected in parallel by the first connecting means, the capacitor is charged by the charging power supply, the charging power supply is disconnected from the capacitor, the selected secondary battery cell and the capacitor are connected in parallel by the second connecting means, and the selected secondary battery cell is charged by the capacitor.

A method for controlling a first secondary battery cell and a second secondary battery cell connected in series and for charging the first secondary battery cell and the second secondary battery cell, comprising the steps of:

• connecting a charging power supply and a capacitor in parallel, a first terminal of the capacitor being connected to a ground potential;
• and
• connecting one selected from the first secondary battery cell and the second secondary battery cell and the capacitor in parallel,
• wherein the charging power supply and the capacitor are connected in parallel at the first connecting step, the capacitor is charged by the charging power supply, the charging power supply is disconnected from the capacitor, the selected secondary battery cell and the capacitor are connected in parallel at the second connecting step, and the selected secondary battery cell is charged by the capacitor.