Battery device and battery control device

A battery device, comprising:

• a secondary battery configured to supply a current to a load;
• a charger configured to charge the secondary battery;
• a first NMOS transistor configured to control conduction of a current path from the charger to the secondary battery;
• a second NMOS transistor configured to control conduction of a current path from the secondary battery to the load;
• a first diode of which an anode is connected to one end of the secondary battery;
• a second diode of which an anode is connected to one end of the charger and a cathode is connected to a cathode of the first diode;
• a first capacitor configured to accumulate charge to be transferred to a gate of the first NMOS transistor;
• a second capacitor configured to accumulate charge to be transferred to a gate of the second NMOS transistor;
• and
• a battery control device configured to control charging/discharging of the secondary battery by controlling the accumulation of charge into the first and second capacitors and the transfer of the charge to the gates of the first and second NMOS transistors,
• wherein the battery control device includes:
• a first switch section configured to control whether or not the charge accumulated in the first capacitor be transferred to the gate of the first NMOS transistor,
• a second switch section configured to control whether or not the charge accumulated in the second capacitor be transferred to the gate of the second NMOS transistor,
• a third switch section one end of which is connected between the cathodes of the first and second diodes, and
• a second level shift section having a third level shift circuit connected to the other end of the third switch section and configured to output charge to be accumulated in the first and second capacitors.

A battery control device, used together with

• a first NMOS transistor configured to control conduction of a current path from a charger to a secondary battery,
• a second NMOS transistor configured to control conduction of a current path from the secondary battery to a load,
• a first capacitor configured to accumulate charge to be transferred to a gate of the first NMOS transistor, and
• a second capacitor configured to accumulate charge to be transferred to a gate of the second NMOS transistor, the battery control device comprising:
• a first diode of which an anode is connected to one end of the secondary battery;
• and
• a second diode of which an anode is connected to one end of the charger and a cathode is connected to a cathode of the first diode,
• wherein the battery control device controls charging/discharging of the secondary battery by controlling the accumulation of charge into the first and second capacitors and the transfer of the charge to the gates of the first and second NMOS transistors, and
• the battery control device includes:
• a first switch section configured to control whether or not the charge accumulated in the first capacitor be transferred to the gate of the first NMOS transistor,
• a second switch section configured to control whether or not the charge accumulated in the second capacitor be transferred to the gate of the second NMOS transistor,
• a third switch section one end of which is connected between the cathodes of the first and second diodes, and
• a first level shift section having a first level shift circuit connected to the other end of the third switch section and configured to output charge to be accumulated in the first capacitor and a second level shift circuit connected to the other end of the third switch section and configured to output charge to be accumulated in the second capacitor.