Method for charging determining life of and detecting state of charge of battery
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsKiichi Koike, Nobuyuki Takami, Yasuyuki Yoshihara, Hiroyuki Jimbo
Life of this patent
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Abstract
A method for charging a lead battery is provided. In the method, a SOC is controlled so as to be less than 100%, and when the lead battery has not been charged and discharged for a predetermined time, refresh charge is performed so that the SOC becomes at least 90% or more.
Claims15
A method for charging a lead battery, wherein:
- a state of charge is controlled so as to be less than 100%;
- and
- when the lead battery has not been charged and discharged for a predetermined time, refresh charge is performed so that the state of charge becomes at least 90% or more.
A method for charging a lead battery, wherein:
- a state of charges is controlled so as to be less than 100%;
- and
- every time the lead battery is charged and discharged in predetermined time intervals, refresh charge is performed so that the state of charge becomes at least 90% or more.
A method for charging a lead battery, wherein:
- a state of charge is controlled so as to be less than 100%;
- and
- when the state of charge is lowered below a predetermined value, refresh charge is performed so that the state of charge becomes at least 90% or more.
A method for charging a lead battery, wherein:
- a state of charge is controlled so as to be less than 100%;
- and
- when a temperature of the lead battery is less than or equal to a predetermined value, refresh charge is preformed so that the state of charge becomes at least 90% or more.
A method for determining the life of a battery, wherein:
- the battery is subjected to refresh charge, a state of charge of the battery after the refresh charge is presumed to be 100%, charge and discharge are performed, and
- a state of charge (1) of the battery after the charge and discharge, the state of charge (1) obtained base on quantity of the charge, and a state of charge (2) obtained based an open circuit voltage are compared with each other, and the life of the battery is determined based on a difference between the state of charge (1) and the state of charge (2).
A method for determining the life of a battery, wherein a first DC-IR value is obtained with respect to a state of charge of the battery in an initial state where the battery is not degraded, based on charging and discharging currents and an open circuit voltage, and
- the first DC-IR value is compared with a second DC-IR value of the battery in the initial state obtained in advance, and the life of the battery is determined based on a difference between the first and second DC-IR values.
A method for detecting a state of charge or a lead battery, wherein an open circuit voltage of the lead battery or a discharging voltage of the lead battery when a discharging current is less than or equal to a predetermined value is measured, and the state of charge of the lead battery is detected based on a relationship between the predetermined open circuit voltage and the state of charge or a relationship between the discharging voltage and the state of charge, and
- when the state of charge is calculated, a variation in the open circuit voltage or a variation in the discharging voltage and a variation in the state of charge are measured with respect to a predetermined time, and the relationship between the predetermined open circuit voltage and the state of charge or the relationship between the discharging voltage and the state of charge is corrected.
Dependencies are inferred from the claim text.