Patent ID: 11933857
Assignee: TOYO SYSTEM CO., LTD
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC G  B  H  Y | IPC B  G  H

Claim 1:
2. A battery residual value determination method carried out by a computer, the method comprising:
a battery information reception step of receiving information on a voltage, a current, a temperature, and a period of time elapsed from a time of manufacture of a battery for which a residual value is to be determined,
a first residual value determination step of determining a first residual value indicating a SOH (State of Health) of the battery based on the information on the voltage, the current, and the temperature of the battery received in the battery information reception step;
an attenuation function determination step of determining an attenuation function which indicates a time-dependent change of the SOH specific to the battery and which is used for correcting the first residual value of the battery; and
a second residual value output step of determining and outputting a second residual value obtained by correcting the first residual value by using the attenuation function according to the period of time elapsed from the time of manufacture of the battery,
wherein:
the battery information reception step comprises receiving information on the period of time elapsed from the time of manufacture and information indicating a service life of the battery,
the attenuation function determination step comprises determining an attenuation coefficient by using an attenuation function determined based on the information on the period of time elapsed from the time of manufacture of the battery and the information indicating the service life of the battery received by the battery information reception unit,
the second residual value output step comprises determining, as the second residual value, a value obtained by multiplying the first residual value by the attenuation coefficient, and
the attenuation function determination step comprises determining the attenuation coefficient by using expression (1) given below:
[Expression 1]

y=1/1+ea(x−b)  (1)

where “y” denotes the attenuation coefficient of the battery, “a” denotes a constant, “b” denotes a value indicating the service life of the battery, “e” denotes Napier's constant, and “x” denotes a value indicating the period of time elapsed from the time of manufacture of the battery in terms of a number of years.