Patent ID: 9231420
Filing Date: 2016-01-05
CPC Classification: H01M,H02J,Y02E

Claim Text:
1. A cell balance apparatus configured to equalize respective charge voltages of a first rechargeable battery, a second rechargeable battery and a third rechargeable battery, the cell balance circuit comprising: a first cell balance circuit configured to equalize respective charge voltages of the first rechargeable battery and the second rechargeable battery; and a second cell balance circuit configured to equalize respective charge voltages of the second rechargeable battery and the third rechargeable battery; the first cell balance circuit comprising: a first transformer comprising a primary winding arranged so as to form a set with the first rechargeable battery and a secondary winding arranged so as to form a set with the second rechargeable battery; and a first switching unit configured to control a state of whether or not a charge voltage of the first rechargeable battery is applied to the primary winding, wherein the first switching unit comprises a first switch, a second switch, a third switch, and a fourth switch, and the switching unit is configured as a non-resonant circuit, and wherein a second terminal of the primary winding and a first terminal of the secondary winding are each connected to a second terminal of the first rechargeable battery, and are each connected to a first terminal of the second rechargeable battery, and wherein the primary winding is arranged such that a first terminal thereof can be connected to a first terminal of the first rechargeable battery via the first switch, and such that the first terminal thereof can be connected to a second terminal of the second rechargeable battery via the second switch, and wherein the secondary winding is arranged such that a second terminal thereof can be connected to the first terminal of the first rechargeable battery via the third switch, and such that the second terminal thereof can be connected to the second terminal of the second rechargeable battery via the fourth switch, and wherein the first switching unit alternately switches on and off the first switch together with the fourth switch and the second switch together with the third switch when the first and second rechargeable batteries are charged or otherwise discharged; the second cell balance circuit comprising: a second transformer comprising a third winding arranged so as to form a set with the second rechargeable battery and a fourth winding arranged so as to form a set with the third rechargeable battery; and a second switching unit configured to control a state of whether or not a charge voltage of the second rechargeable battery is applied to the third winding, wherein the second switching unit comprises a fifth switch, a sixth switch, a seventh switch, and an eighth switch, and the switching unit is configured as a non-resonant circuit, and wherein a second terminal of the third winding and a first terminal of the fourth winding are each connected to the second terminal of the second rechargeable battery, and are each connected to a first terminal of the third rechargeable battery, and wherein the third winding is arranged such that a first terminal thereof can be connected to the first terminal of the second rechargeable battery via the fifth switch, and such that the first terminal thereof can be connected to a second terminal of the third rechargeable battery via the sixth switch, and wherein the fourth winding is arranged such that a second terminal thereof can be connected to the first terminal of the second rechargeable battery via the seventh switch, and such that the second terminal thereof can be connected to the second terminal of the third rechargeable battery via the eighth switch, and wherein, the second switching unit alternately switches on and off the fifth switch together with the eighth switch and the sixth switch together with the seventh switch when the second and third rechargeable batteries are charged or otherwise discharged.