Battery cell balancing circuit using LC serial resonance

A battery cell balancing circuit using LC serial resonance comprising:

• a battery module including a plurality of serially connected battery cells;
• a first switch unit including a plurality of MOS transistors and reverse current blocking diodes connected between each terminal of the plurality of battery cells and a first common node in order to provide the path for collecting electric energy charged in one or more battery cells of the plurality of battery cells and storing the electric energy in a capacitor, or for supplying the electric energy collected and stored in the capacitor to the one or more battery cells, each MOS transistor and each diode being connected in parallel to each other;
• a second switch unit including a plurality of MOS transistors and reverse current blocking diodes connected between each terminal of the plurality of battery cells and a second common node in order to provide a path for supplying the electric energy collected and stored in the capacitor to the one or more battery cells, or for collecting the electric energy charged in the one or more battery cells, each MOS transistor and each diode being connected in parallel to each other;
• a serial resonant circuit connected between the first common node and the second common node and including an inductor and the capacitor, the indicator and the capacitor are serially connected and performing a serial resonant function;
• and
• a third switch unit including MOS transistors and reverse current blocking diodes connected between the first common node and both terminals of the serial resonant circuit and MOS transistors and reverse current blocking diodes connected between the second common node and both terminals of the serial resonant circuit in order to provide the path for collecting the electric energy charged in the one or more battery cells of the plurality of battery cells, or for supplying the electric energy collected and stored in the capacitor to the one or more battery cells, each MOS transistor and each diode being connected in parallel to each other;
• wherein the serial resonant circuit further including:
• a first diode and a second diode connected in parallel to each other between both terminals of the serial resonant circuit and an upper terminal which is connected to a positive terminal of a battery cell of the plurality of serially connected battery cells;
• and
• a third diode and a fourth diode connected in parallel to each other between both terminals of the serial resonant circuit and a lower terminal which is connected to a negative terminal of another battery cell of the plurality of serially connected battery cells.

A battery cell balancing circuit using LC serial resonance

• and performing battery cell balancing, comprising:
• a battery module including a plurality of serially connected battery cells;
• a first switch unit including a plurality of switch paths connected between some of terminals of the plurality of battery cells and a first common node in order to provide a path for collecting electric energy charged in an arbitrary cell of the plurality of battery cells, or for supplying the electric energy collected and stored in a capacitor to the arbitrary cell battery cell, the plurality of switch paths each including two serially connected MOS transistors each connected in parallel to diodes;
• a second switch unit including a plurality of switch paths connected between remaining terminals, other than some of terminals of the plurality of battery cells, and a second common node in order to provide the path for supplying the electric energy collected and stored in the capacitor to the arbitrary cell, or for collecting the electric energy charged in the arbitrary cell, the plurality of switch paths each including two serially connected MOS transistors each connected in parallel to diodes;
• a serial resonant circuit connected between the first common node and the second common node and including an inductor and the capacitor, the indicator and the capacitor are serially connected and performing a serial resonant function;
• and
• a third switch unit including switch paths connected between the first common node and both terminals of the serial resonant circuit and switch paths connected between the second common node and both terminals of the serial resonant circuit in order to provide the path for collecting the electric energy charged in the arbitrary cell of the plurality of battery cells, or for supplying the electric energy collected and stored in the capacitor to the arbitrary cell, the plurality of switch paths each including two serially connected MOS transistors each connected in parallel to diodes;
• wherein the serial resonant circuit further including:
• a first diode and a second diode connected in parallel to each other between both terminals of the serial resonant circuit and an upper terminal which is connected to a positive terminal of a battery cell of the plurality of serially connected battery cells;
• and
• a third diode and a fourth diode connected in parallel to each other between both terminals of the serial resonant circuit and a lower terminal which is connected to a negative terminal of another battery cell of the plurality of serially connected battery cells.

A battery cell balancing circuit using LC serial resonance

• and performing battery cell balancing, comprising:
• a battery module including a plurality of serially connected battery cells;
• a first switch unit including a plurality of switches each connected between each
• terminal of the plurality of battery cells and a first common node in order to provide a path for collecting electric energy charged in one or more battery cells of the plurality of battery cells and storing the electric energy in 1 capacitor, or for supplying the electric energy collected and stored in the capacitor to the one or more battery cells;
• a second switch unit including a plurality of switches each connected between each terminal of the plurality of battery cells and a second common node in order to provide the path for supplying the electric energy collected and stored in the capacitor to the one or more battery cells, or for collecting the electric energy charged in the one or more battery cells;
• and
• a serial resonant circuit connected between the first common node and the second common node and including an inductor and the capacitor, the indicator and the capacitor are serially connected and performing a serial resonant function;
• wherein the serial resonant circuit further including:
• a first diode and a second diode connected in parallel to each other between both terminals of the serial resonant circuit and an upper terminal which is connected to a positive terminal of a battery cell of the plurality of serially connected battery cells;
• and
• a third diode and a fourth diode connected in parallel to each other between both terminals of the serial resonant circuit and a lower terminal which is connected to a negative terminal of another battery cell of the plurality of serially connected battery cells.