Power storage system and charging method for secondary battery

1. A power storage system, comprising:

a parameter detector that detects a parameter of a secondary battery;

a table storage unit that stores a table indicating a correspondence between a combination of the parameter of the secondary battery and a set of first charging conditions; and

a charging control unit configured to:

determine a temperature range of the secondary battery, and refer to the table using the temperature range and the parameter at a same time to obtain a corresponding charging condition from the table and control charging the secondary battery in the corresponding charging condition,

wherein the temperature range, the parameter, and the corresponding charging condition are defined to ensure a predetermined use period of the secondary battery;

further comprising:

an amount-of-deterioration calculator that calculates an amount of deterioration of the secondary battery; and

an allowable amount-of-deterioration calculator that calculates an allowable amount of deterioration of the secondary battery; wherein the charging control unit is configured to compare the calculated amount of deterioration with the calculated allowable amount of deterioration and to update the corresponding charging condition of the table such that a deterioration speed of the secondary battery is suppressed according to a result thereof,

wherein the amount-of-deterioration calculator and the allowable amount-of-deterioration calculator calculate the amount of deterioration and the allowable amount of deterioration, respectively, according to a predetermined timing condition; and

the charging control unit is configured to update, if a change value of the amount of deterioration that is next acquired with respect to the amount of deterioration at a point of time at which the corresponding charging condition of the table was updated is larger than a change value of the allowable amount of deterioration that is next acquired with respect to the allowable amount of deterioration at the point of time at which the corresponding charging condition of the table was updated, wherein the corresponding charging condition of the table is such that the deterioration speed of the secondary battery is reduced.

2. The power storage system according to claim 1 , wherein charging by the charging control unit is controlled in the corresponding charging condition if a temperature of the secondary battery is lower than a predetermined temperature, and the charging is controlled in a fixed charging condition if the temperature of the secondary battery is equal to or higher than the predetermined temperature.

3. The power storage system according to claim 1 , wherein the parameter is an internal resistance of the secondary battery.

4. A charging method for a secondary battery, comprising:

detecting a parameter of the secondary battery;

determining a temperature range of the secondary battery, and referring to a corresponding charging condition from a table using the temperature range and the parameter at a same time to obtain a corresponding charging condition from the table; and

controlling charging of the secondary battery in the corresponding charging condition,

wherein the temperature range, the parameter, and the corresponding charging condition are defined to ensure a predetermined use period of the secondary battery;

further comprising:

calculating, by an amount-of-deterioration calculator, an amount of deterioration of the secondary battery; and

calculating, by the allowable amount-of-deterioration calculator, an allowable amount of deterioration of the secondary battery; wherein a charging control unit is configured to compare the calculated amount of deterioration with the calculated allowable amount of deterioration and to update the corresponding charging condition of the table such that a deterioration speed of the secondary battery is suppressed according to a result thereof, and

calculating, by the amount-of-deterioration calculator and the allowable amount-of-deterioration calculator, the amount of deterioration and the allowable amount of deterioration, respectively, according to a predetermined timing condition;

wherein the charging control unit is configured to update, if a change value of the amount of deterioration that is next acquired with respect to the amount of deterioration at a point of time at which the corresponding charging condition of the table was updated is larger than a change value of the allowable amount of deterioration that is next acquired with respect to the allowable amount of deterioration at the point of time at which the corresponding charging condition of the table was updated, wherein the corresponding charging condition of the table is such that a deterioration speed of the secondary battery is reduced.

5. The charging method according to claim 4 , wherein charging by the charging control unit is controlled based on a comparison of a temperature of the secondary battery with a predetermined temperature.

6. The charging method according to claim 5 , wherein the predetermined temperature corresponds to a room temperature.

7. The charging method according to claim 4 , wherein the corresponding charging condition varies within the table.

8. The charging method according to claim 4 , wherein the parameter is an internal resistance of the secondary battery.

9. A power storage system, comprising:

a parameter detector that detects a parameter of a secondary battery;

a table storage unit that stores a table indicating a correspondence between a combination of the parameter of the secondary battery and a set of first charging conditions;

an allowable amount-of-deterioration calculator that calculates an allowable amount of deterioration according to a predetermined timing condition; and

a charging control unit configured to:

update the table based on the allowable amount of deterioration,

determine a temperature range of the secondary battery, and refer to the table using the temperature range and the parameter at a same time to obtain a corresponding charging condition from the table and control charging the secondary battery in the corresponding charging condition,

wherein the temperature range, the parameter, and the corresponding charging condition are defined to ensure a predetermined use period of the secondary battery;

further comprising:

an amount-of-deterioration calculator that calculates an amount of deterioration of the secondary battery; and

the allowable amount-of-deterioration calculator that calculates an allowable amount of deterioration of the secondary battery; wherein the charging control unit is configured to compare the calculated amount of deterioration with the calculated allowable amount of deterioration and to update the corresponding charging condition of the table such that a deterioration speed of the secondary battery is suppressed according to a result thereof,

wherein the amount-of-deterioration calculator and the allowable amount-of-deterioration calculator calculate the amount of deterioration and the allowable amount of deterioration, respectively, according to the predetermined timing condition; and

the charging control unit is configured to update, if a change value of the amount of deterioration that is next acquired with respect to the amount of deterioration at a point of time at which the corresponding charging condition of the table was updated is larger than a change value of the allowable amount of deterioration that is next acquired with respect to the allowable amount of deterioration at the point of time at which the corresponding charging condition of the table was updated, wherein the corresponding charging condition of the table is such that the deterioration speed of the secondary battery is reduced.