Storage battery management device and method for managing battery device

A storage battery management device that manages a battery assembly in which a plurality of storage batteries are connected in series, the storage battery management device comprising:

• a voltage measuring unit that measures the voltage of each of the plurality of storage batteries;
• a control unit;
• a voltage conversion circuit provided on a path that supplies electric power from the battery assembly to the control unit;
• an activation switch connected between the voltage conversion circuit and the battery assembly;
• and
• a power supply activation circuit that includes an input terminal to which an external activation signal is input, turns on the activation switch when a logic state of the external activation signal becomes an activation logic, outputs a monitoring signal indicating the logic state of the external activation signal to the control unit, and maintains the on-state of the activation switch as long as an activation maintenance signal is input from the control unit,
• the control unit comprising:
• a line switch control unit that turns on a line switch connected in series with the battery assembly when the logic state of the external activation signal becomes an activation logic, and turns off the line switch when the logic state of the external activation signal becomes a stop logic;
• an activation maintenance control unit that starts the output of the activation maintenance signal to the power supply activation circuit when the logic state of the external activation signal becomes the activation logic;
• and
• an OCV identifying unit that acquires the change amount of the voltage of each of the plurality of storage batteries measured by the voltage measuring unit at predetermined time intervals when the logic state of the external activation signal becomes the stop logic, and when the number of acquisitions of the change amount reaches a predetermined number, estimates the OCV of each of the plurality of storage batteries based on the change amount of the voltage acquired until then, records the estimated OCV, and causes the activation maintenance control unit to stop the output of the activation maintenance signal.

A storage battery management device that manages a battery assembly in which a plurality of storage batteries are connected in series, the storage battery management device comprising:

• a voltage measuring unit that measures the voltage of each of the plurality of storage batteries;
• a control unit;
• a voltage conversion circuit provided on a path that supplies electric power from the battery assembly to the control unit;
• an activation switch connected between the voltage conversion circuit and the battery assembly;
• and
• a power supply activation circuit that includes an input terminal to which an external activation signal is input, turns on the activation switch when a logic state of the external activation signal becomes an activation logic, outputs a monitoring signal indicating the logic state of the external activation signal to the control unit, and maintains the on-state of the activation switch as long as an activation maintenance signal is input from the control unit,
• the control unit comprising:
• a line switch control unit that turns on a line switch connected in series with the battery assembly when the logic state of the external activation signal becomes an activation logic, and turns off the line switch when the logic state of the external activation signal becomes a stop logic;
• an activation maintenance control unit that starts the output of the activation maintenance signal to the power supply activation circuit when the logic state of the external activation signal becomes the activation logic;
• and
• an OCV identifying unit that acquires the change amount of the voltage of each of the plurality of storage batteries measured by the voltage measuring unit at predetermined time intervals when the logic state of the external activation signal becomes the stop logic, and every time the number of acquisitions of the change amount of the voltage reaches a predetermined number, estimates the OCV of each of the plurality of storage batteries based on the change amount of the voltage acquired until then, records the estimated OCV, and causes the activation maintenance control unit to stop the output of the activation maintenance signal when a predetermined time has elapsed since the line switch was turned off.