Abstract: A method for charging an assembled battery including series circuits connected in parallel, each of the series circuits including series-connected lead storage batteries, using a single charger is provided. The method includes: a first step of obtaining a first index value, corresponding to a resistance value of a first series circuit with a correlative relationship, the first series circuit having a lowest resistance value; a second step of obtaining a second index value corresponding to a resistance value of a second series circuit with a correlative relationship, the second series circuit having a highest resistance value; a third step of performing normal charging, in which the assembled battery is charged with a first amount of charge corresponding to the first index value; and a fourth step of performing refresh charging, in which the assembled battery is charged with a second amount of charge corresponding to the second index value.

Abstract: A method for charging an assembled battery including series circuits connected in parallel, each of the series circuits including series-connected lead storage batteries, using a single charger is provided. The method includes: a first step of obtaining a first index value corresponding to a resistance value of a first series circuit with a correlative relationship, the first series circuit having a lowest resistance value; a second step of obtaining a second index value corresponding to a resistance value of a second series circuit with a correlative relationship, the second series circuit having a highest resistance value; a third step of performing normal charging, in which the assembled battery is charged with a first amount of charge corresponding to the first index value; and a fourth step of performing refresh charging, in which the assembled battery is charged with a second amount of charge corresponding to the second index value.

Abstract: An object of this invention is to simultaneously resolve a decline in capacity due to undercharging of, and degradation due to overcharging of, a lead-acid battery, which occur as a result of random charging. A method of controlling a lead-acid battery of this invention is characterized in that a first region extending until an accumulated discharged capacity D1 at which a theoretical discharged capacity is the maximum value Dmax is reached, and a subsequent second region in which the accumulated discharged capacity D1 is exceeded, are set, and in that a value R1 obtained by dividing an accumulated charged capacity C1 by the accumulated discharged capacity D1 in the first region is made to be larger than a value R2 obtained by dividing an accumulated charged capacity C2 by an accumulated discharged capacity D2 in the second region.

Abstract: A charge control circuit includes a first acquisition unit that acquires a total discharge electric quantity of a lead storage battery, the total discharge electric quantity being separated into a first discharge electric quantity which is a discharge electric quantity of a discharge current having a current value of less than a predetermined level, and a second discharge electric quantity which is a discharge electric quantity of a discharge current having a current value of not less than the predetermined level, a computing unit that obtains a first and second charge electric quantities corresponding to the first and second discharge electric quantities respectively, and a charge electric quantity required for charging the lead storage battery as a sum of the obtained first and second charge electric quantities, and a charge control unit that controls a charge of the lead storage battery based on the charge electric quantity.

Abstract: Disclosed is a charging control method including: a full charging step of charging a lead storage battery until the battery is fully charged; a refresh charging step of performing refresh charging of charging the lead storage battery with a predetermined refresh charging quantity of electricity after the lead storage battery has been fully charged; and a refresh charging quantity setting step of setting the refresh charging quantity of electricity in the refresh charging step for the lead storage battery which has been fully charged at a present time, depending on a temperature of the lead storage battery throughout a deficient charging period, the deficient charging period being a period from a time when the lead storage battery has been fully charged at a previous time to a time when the lead storage battery has been fully charged at the present time in the full charging step.

Abstract: A charge control circuit includes a first acquisition unit that acquires a total discharge electric quantity of a lead storage battery, the total discharge electric quantity being separated into a first discharge electric quantity which is a discharge electric quantity of a discharge current having a current value of less than a predetermined level, and a second discharge electric quantity which is a discharge electric quantity of a discharge current having a current value of not less than the predetermined level, a computing unit that obtains a first and second charge electric quantities corresponding to the first and second discharge electric quantities respectively, and a charge electric quantity required for charging the lead storage battery as a sum of the obtained first and second charge electric quantities, and a charge control unit that controls a charge of the lead storage battery based on the charge electric quantity.

Abstract: The present invention provides a battery charging system that includes: an assembled battery, in which a plurality of secondary batteries are connected in parallel using valve-regulated lead-acid batteries in which separators impregnated with electrolyte are arranged between mutually opposed plate-like positive electrodes and negative electrodes; and a plurality of charging units that are provided corresponding to the respective secondary batteries and that charge the corresponding secondary battery, respectively, wherein each of the charging units executes multistage constant-current charging in which constant-current charging is repeated a preset plurality of times for supplying current of a prescribed set current value to each corresponding secondary battery until the terminal voltage of the each corresponding secondary battery reaches a prescribed charging cutoff voltage, and also the set current value is reduced each time the constant-current charging is repeated.

Abstract: Disclosed is a charging control method including: a full charging step of charging a lead storage battery until the battery is fully charged; a refresh charging step of performing refresh charging of charging the lead storage battery with a predetermined refresh charging quantity of electricity after the lead storage battery has been fully charged; and a refresh charging quantity setting step of setting the refresh charging quantity of electricity in the refresh charging step for the lead storage battery which has been fully charged at a present time, depending on a temperature of the lead storage battery throughout a deficient charging period, the deficient charging period being a period from a time when the lead storage battery has been fully charged at a previous time to a time when the lead storage battery has been fully charged at the present time in the full charging step.

Abstract: Disclosed is a charging control method including: a full charging step of charging a lead storage battery until the battery is fully charged; a refresh charging step of performing refresh charging of charging the lead storage battery with a predetermined refresh charging quantity of electricity after the lead storage battery has been fully charged; and a refresh charging quantity setting step of setting the refresh charging quantity of electricity in the refresh charging step for the lead storage battery which has been fully charged at a present time, depending on a temperature of the lead storage battery throughout a deficient charging period, the deficient charging period being a period from a time when the lead storage battery has been fully charged at a previous time to a time when the lead storage battery has been fully charged at the present time in the full charging step.

Abstract: Disclosed is a charging control method including: a full charging step of charging a lead storage battery until the battery is fully charged; a refresh charging step of performing refresh charging of charging the lead storage battery with a predetermined refresh charging quantity of electricity after the lead storage battery has been fully charged; and a refresh charging quantity setting step of setting the refresh charging quantity of electricity in the refresh charging step for the lead storage battery which has been fully charged at a present time, depending on a temperature of the lead storage battery throughout a deficient charging period, the deficient charging period being a period from a time when the lead storage battery has been fully charged at a previous time to a time when the lead storage battery has been fully charged at the present time in the full charging step.

Abstract: An object of this invention is to simultaneously resolve a decline in capacity due to undercharging of, and degradation due to overcharging of, a lead-acid battery, which occur as a result of random charging. A method of controlling a lead-acid battery of this invention is characterized in that a first region extending until an accumulated discharged capacity D1 at which a theoretical discharged capacity is the maximum value Dmax is reached, and a subsequent second region in which the accumulated discharged capacity D1 is exceeded, are set, and in that a value R1 obtained by dividing an accumulated charged capacity C1 by the accumulated discharged capacity D1 in the first region is made to be larger than a value R2 obtained by dividing an accumulated charged capacity C2 by an accumulated discharged capacity D2 in the second region.

Abstract: The present invention provides a battery charging system that includes: an assembled battery, in which a plurality of secondary batteries are connected in parallel using valve-regulated lead-acid batteries in which separators impregnated with electrolyte are arranged between mutually opposed plate-like positive electrodes and negative electrodes; and a plurality of charging units that are provided corresponding to the respective secondary batteries and that charge the corresponding secondary battery, respectively, wherein each of the charging units executes multistage constant-current charging in which constant-current charging is repeated a preset plurality of times for supplying current of a prescribed set current value to each corresponding secondary battery until the terminal voltage of the each corresponding secondary battery reaches a prescribed charging cutoff voltage, and also the set current value is reduced each time the constant-current charging is repeated.