Charge equalization apparatus with parallel connection of secondary windings of multiple transformers

Abstract

The present invention relates, in general, to a charge equalization apparatus with series-connected battery cells and, more particularly, to a charge equalization apparatus, in which series-connected battery cells (Bl to BN) are connected in parallel with the primary windings (Mi l to MlN) of transformers (Tl to TN), switches (Sl to SN) for controlling the flow of current of the primary windings are connected in series with the primary windings (Ml 1 to MlN), and multiple secondary windings (M21 to M2N) corresponding to the primary windings are connected in parallel with each other.

Description

technical field [0001] The present invention relates generally to a charge equalization device having battery cells connected in series, and more particularly to a charge equalization device in which the battery cells connected in series are connected in parallel with the primary winding of a transformer, and a switch for controlling the current flow direction of the primary winding is connected to the primary winding. The coils are connected in series, and a plurality of secondary coils corresponding to the primary coils are connected in parallel with each other. Background technique [0002] Several systems use battery packs implemented as battery packs or battery arrays, including a plurality of battery cells connected in series with each other. [0003] This is dangerous when such battery cells are charged too high or too low within the rated charging voltage range. [0004] The state of charge imbalance of the battery cells is caused by a variety of factors and occurs ...

AI Technical Summary

Problems solved by technology

For example, such a problem can typically occur in electric vehicles, where the battery pack's ability to deliver energy is limited by the battery cell with the lowest state of charge

[0016] However, according to the prior art, there is a problem that since a plurality of primary coils corresponding to the number of battery cells must be wound around a common iron core, it is difficult to manufacture the transformer when the number of battery cells connected in series increases

[0017] Moreover, in the prior art, the voltage of the battery cells connected in series is applied to the primary coil for a period of time, during which the switch is turned off to prevent the transformer from saturating, at this time, the turns ratio of the primary coil to the secondary coil is N (series The number of battery cells), so as the number of battery cells increases, it brings difficulty to the manufacture of the secondary coil

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