POWER TRANSFER CIRCUIT FOR ACHIEVING POWER TRANSFER BETWEEN STACKED RECHARGEABLE BATTERY CELLS

摘要

A power transfer circuit for achieving power transfer between stacked rechargeable battery cells is disclosed. The power transfer circuit includes an inductor, a first switch, a second switch and a controller. A loop of the rechargeable battery cell having higher power and the inductor is conducted so that the inductor stores power until the current flowing through the inductor meets the cutoff amount. Then, a loop of the rechargeable battery cell having lower power and the inductor is conducted so that the inductor releases the power saved in the inductor to the rechargeable battery cell having lower power until current flowing through the inductor changes direction. Therefore, balance between the rechargeable battery cells can be achieved.

主权项

1. A power transfer circuit for achieving power transfer between stacked rechargeable battery cells, comprising:
an inductor respectively linked to two stacked rechargeable battery cells in parallel but not electrically conducted where the two stacked rechargeable battery cells are connected in series, for storing power and releasing stored power, wherein an anode of one rechargeable battery cell is electrically connected to a cathode of the other rechargeable battery cell directly or indirectly so that a loop is formed; a first switch, connected to the inductor and one of the two rechargeable battery cells, for conducting a loop linking of the inductor and the rechargeable battery cell connected thereto after receiving a conducting signal; a second switch, connected to the inductor and the other of the two rechargeable battery cells, for conducting a loop linking of the inductor and the rechargeable battery cell connected thereto after receiving a conducting signal; and a controller, comprising:
a first comparator, connected to a first end and a second end of the first switch, for detecting voltage difference across the first switch;a second comparator, connected to a third end and a fourth end of the second switch, for detecting voltage difference across the second switch;a first signal source for sending the conducting signal to the first switch;a second signal source for sending the conducting signal to the second switch.