Patent ID: 6380717
Filing Date: 2002-04-30
Classification: H01M,H02J,Y02E

Abstract:
A charging control device for controlling charging of a secondary battery used for applications in which the secondary battery is charged and discharged repeatedly in a charged but not fully charged state, comprising:a battery temperature detecting section for detecting a temperature of the secondary battery every first predetermined time; a temperature gradient operation section for calculating a temperature gradient, indicating a temperature increase per unit time, every second predetermined time that is longer than the first predetermined time, based on the temperature detected by the battery temperature detecting section; and a temperature gradient determination section for determining whether the temperature gradient calculated by the temperature gradient operation section is larger than a predetermined temperature gradient threshold preset according to a charged state of the secondary battery, wherein when the temperature gradient determination section determines that the temperature gradient calculated by the temperature gradient operation section is larger than the predetermined temperature gradient threshold N times in a row (where N is a natural number), a fully charged state of the secondary battery is detected.