Storage battery voltage control apparatus
First Claim
1. A storage battery voltage control apparatus for equalizing the voltage of each of a plurality of series-connected storage battery cells of a storage battery cell group, comprising a voltage-correcting storage battery for connecting in parallel to each of said storage battery cells, storage battery cell selection means for selecting an arbitrary storage battery cell, switching means constituting a circuit for charge transfer between the storage battery cells and said voltage-correcting storage battery such that in a voltage-correcting operation said voltage-correcting storage battery is connected to one of said storage battery cells at one time to conduct a charge transfer therebetween in either direction for equalizing the voltages of said voltage-correcting storage battery and said one storage battery cell, and control means for controlling the switching operation of said switching means, wherein said charge transfer includes a charge transfer from a storage battery cell having a highest voltage to said voltage-correcting storage battery.
1 Assignment
0 Petitions
Accused Products
Abstract
Eight storage battery cells 111 to 118 making up a storage battery cell group 2 can be connected selectively to a voltage-correcting storage battery 12 through nine cell change-over switches 131 to 139, four polarity-inverting switches 141 to 144 and a current-limiting resistor 15. When the voltages of two or more of the storage battery cells 111 to 118 are different, the voltages of each of the storage battery cells 111 to 118 can be equalized by then transferring the charge from a storage battery cell high in voltage to the voltage-correcting storage battery 12 and by transferring the charge of that voltage-correcting storage battery 12 to a storage battery cell low in voltage. As a result, the voltage difference due to the performance variations among the individual storage battery cells 111 to 118 can be obviated thereby to increase the working voltage range of the storage battery cell group 2 as a whole.
-
Citations
20 Claims
- 1. A storage battery voltage control apparatus for equalizing the voltage of each of a plurality of series-connected storage battery cells of a storage battery cell group, comprising a voltage-correcting storage battery for connecting in parallel to each of said storage battery cells, storage battery cell selection means for selecting an arbitrary storage battery cell, switching means constituting a circuit for charge transfer between the storage battery cells and said voltage-correcting storage battery such that in a voltage-correcting operation said voltage-correcting storage battery is connected to one of said storage battery cells at one time to conduct a charge transfer therebetween in either direction for equalizing the voltages of said voltage-correcting storage battery and said one storage battery cell, and control means for controlling the switching operation of said switching means, wherein said charge transfer includes a charge transfer from a storage battery cell having a highest voltage to said voltage-correcting storage battery.
- 12. A storage battery voltage control apparatus for equalizing the voltage of each of a plurality of series-connected storage battery cells of a storage battery cell group, comprising a voltage-correcting storage battery for connecting in parallel to each of said storage battery cells, storage battery cell selection means for sequentially selecting each of said storage battery cells, a switching circuit means for connecting said selected storage battery cell to said voltage-correcting storage battery for transferring a charge from the one of either said selected storage battery cell or said voltage-correcting storage battery that has the higher voltage to the other of said selected storage battery cell and said voltage-correcting storage battery for reducing a voltage difference therebetween, wherein said transferring of the charge includes a charge transfer from a storage battery cell having a highest voltage to said voltage-correcting storage battery.
Specification