Abstract: An integrated circuit includes: a voltage detection means for detecting a voltage to be applied between the positive electrode and the negative electrode of one or a plurality of secondary batteries; a power supply means for generating a predetermined voltage; an input terminal to which a voltage value according to the value of a current flowing in the secondary battery is input; and a control means configured such that, when the predetermined voltage is input from the power supply means, an overcharge detection signal or an overdischarge detection signal is output in accordance with the voltage detected by the voltage detection means, and when the predetermined voltage is not input from the power supply means, a charge control signal or a discharge control signal is output in accordance with the voltage detected by the voltage detection means or the voltage value to be input to the input terminal.

Abstract: A secondary battery charging method includes the step of determining whether to perform one of a first charging control method of performing constant current charging and constant voltage charging and a second charging control method of performing only the constant current charging according to information stored in a plurality of secondary batteries including a compound oxide particle with an olivine crystal structure. The first charging control method includes the steps of performing the constant current charging of the secondary batteries, performing the constant voltage charging, determining whether voltage variation amounts of the plurality of secondary batteries are a value equal to or greater than a first set value, and storing information and firstly terminating the charging. The second charging control method includes the steps of starting the constant current charging of the plurality of secondary batteries connected to each other in series, and secondly terminating the constant current charging.

Abstract: A secondary battery charging method includes the step of determining whether to perform one of a first charging control method of performing constant current charging and constant voltage charging and a second charging control method of performing only the constant current charging according to information stored in a plurality of secondary batteries including a compound oxide particle with an olivine crystal structure. The first charging control method includes the steps of performing the constant current charging of the secondary batteries, performing the constant voltage charging, determining whether voltage variation amounts of the plurality of secondary batteries are a value equal to or greater than a first set value, and storing information and firstly terminating the charging. The second charging control method includes the steps of starting the constant current charging of the plurality of secondary batteries connected to each other in series, and secondly terminating the constant current charging.

Abstract: An integrated circuit includes: a voltage detection means for detecting a voltage to be applied between the positive electrode and the negative electrode of one or a plurality of secondary batteries; a power supply means for generating a predetermined voltage; an input terminal to which a voltage value according to the value of a current flowing in the secondary battery is input; and a control means configured such that, when the predetermined voltage is input from the power supply means, an overcharge detection signal or an overdischarge detection signal is output in accordance with the voltage detected by the voltage detection means, and when the predetermined voltage is not input from the power supply means, a charge control signal or a discharge control signal is output in accordance with the voltage detected by the voltage detection means or the voltage value to be input to the input terminal.