Energy storage device state estimation device and energy storage device state estimation method

An energy storage device state estimation device for estimating a state of an energy storage device, the energy storage device state estimation device comprising:

• a temperature estimation part configured to estimate a temperature of the energy storage device;
• and
• a state estimation part configured to estimate a state of the energy storage device using the temperature of the energy storage device,
• wherein
• the temperature estimation part estimates a temperature of the energy storage device using a heat generation amount calculated based on a difference between a measured voltage and an open circuit voltage of the energy storage device within a predetermined period and a current value, and a heat absorption amount and a heat generation amount acquired based on a change in an SOC (State Of Charge) within the predetermined period.

An energy storage device state estimation method for estimating a state of an energy storage device, the method comprising:

• a temperature estimation step of estimating a temperature of the energy storage device;
• and
• a state estimation step of estimating a state of the energy storage device using the temperature of the energy storage device,
• wherein
• in the temperature estimation step, in a state where the energy storage device is divided into a plurality of divided regions, the divided regions are respectively assumed as internal regions, a region disposed adjacently to the internal region and disposed outside the energy storage device is assumed as an external region, and a temperature of the energy storage device is estimated using each internal heat transfer amount which is a heat transfer amount between two of the internal regions disposed adjacently to each other and each external heat transfer amount which is a heat transfer amount between each internal region and the external region disposed adjacently to each other.

An energy storage device state estimation method for estimating a state of an energy storage device, the method comprising:

• a temperature estimation step of estimating a temperature of the energy storage device;
• and
• a state estimation step of estimating a state of the energy storage device using the temperature of the energy storage device,
• wherein
• in the temperature estimation step, a temperature of the energy storage device is estimated using a heat generation amount calculated based on a difference between a measured voltage and an open circuit voltage of the energy storage device and a current value within a predetermined period, and a heat absorption amount and a heat generation amount acquired based on a change in an SOC (State Of Charge) within the predetermined period.