Battery state estimating apparatus, battery state estimating method, non-transitory computer readable medium, control circuit and power storage system

1. A battery state estimating apparatus, comprising:

a measurer configured to measure measurement data including a voltage and a current of a battery in a charging/discharging period;

a state estimator configured to estimate a state of the battery based on the measurement data;

a power estimator configured to estimate a first power amount charged/discharged by the battery within the charging/discharging period, based on the state; and

a determiner configured to compare the first power amount with a second power amount inputted/outputted to/from the battery within the charging/discharging period, the second power amount being calculated based on an alternating current inputted/outputted to/from a power storage system, and thereby determine validity of the state.

2. The battery state estimating apparatus according to claim 1 , wherein:

the state estimator calculates one or more parameters that represent the state based on first the measurement data that represents at least the voltage and the current of the battery within the charging/discharging period; and

the state estimator estimates the first power amount based on any of the parameters.

3. The battery state estimating apparatus according to claim 2 , wherein:

the state estimator calculates a first graph that represents a relationship between a charge amount and the voltage of the battery, based on any of the parameters; and

the power estimator calculates the first power amount based on the first graph.

4. The battery state estimating apparatus according to claim 3 , wherein:

the state estimator calculates an initial charge amount and a mass of each of positive electrode and negative electrode of the battery based on the first measurement data;

the state estimator calculates a second graph that represents a relationship between the charge amount and an open circuit voltage of the battery, based on the calculated initial charge amount and the mass of each of the positive electrode and negative electrode of the battery; and

the state estimator calculates the first graph based on the second graph.

5. The battery state estimating apparatus according to claim 1 , wherein

the determiner calculates the second power amount based on second measurement data on an alternating current inputted/outputted to/from a converter that converts an alternating current to a direct current.

6. The battery state estimating apparatus according to claim 5 , wherein

the determiner determines a malfunction of the battery or the converter based on a determination result of the validity.

7. A battery state estimating method, comprising:

measuring measurement data including a voltage and a current of a battery in a charging/discharging period;

estimating a state of a battery based on the measurement data;

estimating a first power amount charged/discharged by the battery within the charging/discharging period, based on the state; and

comparing the first power amount with a second power amount inputted/outputted to/from the battery within the charging/discharging period, the second power amount being calculated based on an alternating current inputted/outputted to/from a power storage system, and thereby determining validity of the state.

8. A non-transitory computer readable medium having a program for causing a computer to execute:

measuring measurement data including a voltage and a current of a battery in a charging/discharging period;

estimating a state of a battery based on the measurement data;

estimating a first power amount charged/discharged by the battery within the charging/discharging period, based on the state; and

comparing the first power amount with a second power amount inputted/outputted to/from the battery within the charging/discharging period, the second power amount being calculated based on an alternating current inputted/outputted to/from a power storage system, and thereby determining validity of the state.

9. A control circuit comprising:

a measurer configured to measure measurement data including a voltage and a current of a battery in a charging/discharging period;

a state estimator configured to estimate a state of a battery based on the measurement data;

a power estimator configured to estimate a first power amount charged/discharged by the battery within the charging/discharging period, based on the state; and

a determiner configured to compare the first power amount with a second power amount inputted/outputted to/from the battery within the charging/discharging period, the second power amount being calculated based on an alternating current inputted/outputted to/from a power storage system, and thereby determine validity of the state.

10. A power storage system comprising:

a battery;

a battery state estimating apparatus configured to estimate a state of a battery;

a converter configured to convert a direct current to an alternating current; and

an alternating current measuring apparatus configured to measure an alternating current inputted/outputted to/from the converter, wherein

the battery state estimating apparatus includes:

a state estimator configured to estimate a state of the battery,

a power estimator configured to estimate first power amount charged/discharged by the battery within a charging/discharging period, based on the state, and

a determiner configured to compare the first power amount with second power amount of the alternating current inputted/outputted to/from the converter within the charging/discharging period and thereby determine validity of the state.