초록 ▼

In an electric motor vehicle, a bidirectional boosting converter is placed in a battery circuit. A main contactor is turned off to disconnect one battery block from another and contactors are turned on to connect a first battery block to one terminal pair of the bidirectional boosting converter and

In an electric motor vehicle, a bidirectional boosting converter is placed in a battery circuit. A main contactor is turned off to disconnect one battery block from another and contactors are turned on to connect a first battery block to one terminal pair of the bidirectional boosting converter and to connect a second battery block to another terminal pair of the bidirectional boosting converter. A refreshing discharge of the first battery block or an equalizing charge of the second battery block is performed by boosting output of the first battery block and using this output to charge the second battery block. The boosting direction of the bidirectional boosting converter is changed to perform an equalizing charge of the first battery block or a refreshing discharge of the second battery block. The boosting direction is changed again to balance battery block SOCs, these by eliminating need for a charging device for equalizing charge or a discharging device for refreshing discharge.

대표청구항 ▼

[ What is claimed is:] [7.] A battery system comprising:a battery block set including battery blocks connectable in series and each having an electromotive force, each battery block having more than one battery cell connected in series;a vehicle propelling motor-generator configured to supply electr

[ What is claimed is:] [7.] A battery system comprising:a battery block set including battery blocks connectable in series and each having an electromotive force, each battery block having more than one battery cell connected in series;a vehicle propelling motor-generator configured to supply electric power to and receive electric power from the battery block set;means for determining whether a predetermined executing condition of at least one of an equalizing charge operation and a refreshing discharge operation is met concerning said battery block set; andmeans for performing, in order to achieve a predetermined refreshed state of charge between the more than one battery cell in each battery block, the at least one of an equalizing charge operation and the refreshing discharge operation for each battery block by sequentially performing a forced charge transfer operation from one battery block to another battery block for each of said battery blocks, when the predetermined executing condition is met and there being no need to supply or receive electric power between said one battery block and the another battery block and said vehicle propelling motor generator.