Patent ID: 9595836
Date: 2017-03-14
CPC Classifications: H02J,Y02T

Claim:
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: wherein a cutoff amount for current flowing through the inductor is preset, when the rechargeable battery cell connected to the first switch has higher power, the first signal source sends the conducting signal to the first switch so that the first switch turns on and the inductor stores power until the current flowing through the inductor meets the cutoff amount, and then the second comparator detects voltage difference between two ends of the second switch and sends the conducting signal to the second switch so that the second switch turns on and the inductor releases stored power to the rechargeable battery cell having lower power until direction of the current flowing through the inductor changes.