Degradation state estimation system, degradation state estimation method, and non-transitory computer-readable recording medium

A degradation state estimation method comprising:

• acquiring usage data of a secondary battery and battery information for specifying the type of the secondary battery;
• searching a degradation characteristic database on the basis of the battery information and specifying degradation characteristic information that includes a storage degradation characteristic, a charging degradation characteristic, and a discharging degradation characteristic of the secondary battery;
• estimating a storage degradation amount, a charging degradation amount, and a discharging degradation amount of the secondary battery on the basis of the specified degradation characteristic information and the usage data of the secondary battery;
• wherein the estimating includes:
• estimating a storage degradation amount of the secondary battery on the basis of the specified storage degradation characteristic and SOC, temperature, and elapsed time obtained based on the usage data of the secondary battery;
• estimating a charging degradation amount of the secondary battery on the basis of SOC, a charging rate, temperature, and a charging amount obtained based on the specified charging degradation characteristic and the usage data of the secondary battery;
• and
• estimating a discharging degradation amount of the secondary battery on the basis of SOC, a discharging rate, temperature, and a discharging amount obtained based on the specified discharging degradation characteristic and the usage data of the secondary battery.

A non-transitory computer-readable recording medium having embodied thereon a degradation state estimation program including computer-implemented modules comprising:

• a module that acquires usage data of a secondary battery and battery information for specifying the type of the secondary battery;
• a module that searches a degradation characteristic database on the basis of the battery information and specifies degradation characteristic information that includes a storage degradation characteristic, a charging degradation characteristic, and a discharging degradation characteristic of the secondary battery;
• and
• a module that estimates a storage degradation amount, a charging degradation amount, and a discharging degradation amount of the secondary battery on the basis of the specified degradation characteristic information and the usage data of the secondary battery,
• wherein the module that estimates the storage degradation amount includes:
• estimating a storage degradation amount of the secondary battery on the basis of the specified storage degradation characteristic and SOC, temperature, and elapsed time obtained based on the usage data of the secondary battery;
• estimating a charging degradation amount of the secondary battery on the basis of SOC, a charging rate, temperature, and a charging amount obtained based on the specified charging degradation characteristic and the usage data of the secondary battery;
• and
• estimating a discharging degradation amount of the secondary battery on the basis of SOC, a discharging rate, temperature, and a discharging amount obtained based on the specified discharging degradation characteristic and the usage data of the secondary battery.