H - Electricity – 02 – J
Patent
H - Electricity
02
J
H02J 7/00 (2006.01) G11B 23/00 (2006.01) H01M 10/48 (2006.01) H02J 7/14 (2006.01)
Patent
CA 2265338
There is a fear of excessively charging a secondary battery, which is subjected to repeated charge and discharge in a specific charged state that is lower than a full charge level. The technique of the present invention measures a temperature gradient of the secondary battery due to a charging process, determines that the charged state of the secondary battery is close to the full charge level at the time point when the temperature gradient abruptly increases, and stops the charging process based on the determination. In the case where the secondary battery is repeatedly charged and discharged, the structure of the present invention corrects the observed temperature gradient. The concrete procedure of the correction subtracts a temperature rise due to a discharging process from the observed temperature gradient and thereby determines a temperature gradient relating to only the charging process. The correction utilizes a table that stores a relationship among the temperature rise due to the discharging process, the discharge current of the secondary battery, and the initial temperature of the secondary battery. This arrangement enables the secondary battery that is subjected to repeated charge and discharge to be adequately charged and thereby effectively prevents the secondary battery from being charged excessively. Another possible arrangement of the present invention carries out the determination of the charged state of the secondary battery based on the temperature gradient, only when the observed charge-discharge electric current shows that the secondary battery is being charged.
Gowling Lafleur Henderson Llp
Matsushita Electric Industrial Co. Ltd.
Toyota Jidosha Kabushiki Kaisha
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