Device for Storing Electrical Energy
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Abstract
The invention relates to a device for storing electrical energy, comprising a plurality of storage cells (12). A switch (16) and an electrical resistor (14) connected in series thereto are connected in parallel to each of the storage cells. At least one switching unit (T) closes each individual switch as soon as the storage cell located parallel to said switch exceeds a specified voltage. There is additionally a time-switch unit (T) that holds each closed switch closed for a specified time after closing has once occurred.
19 Citations
34 Claims
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1-14. -14. (canceled)
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15. A method for operating an apparatus for storing electric energy, comprising
a plurality of storage cells; -
one respective electric resistor in parallel to each of the storage cells; one respective switch in series to the electric resistor and in parallel to the storage cell, and at least one switching unit which closes the switch once the storage cell disposed parallel to said switch exceeds a predetermined voltage; wherein at least one time-switch unit is provided which after the closing keeps every closed switch closed for a predetermined period of time, characterized in that the energy charged to the apparatus and taken from the apparatus is controlled by a control device, wherein the control device, in particular during charging, charges or discharges the apparatus within predetermined voltage limits, wherein the voltage of a least some storage cells is detected, wherefrom a maximum deviation of the detected voltage values among each other is detected, whereupon in the next charging cycle the predetermined upper voltage limit is set during charging or during slightly exceeding if the maximum deviation exceeds a predetermined limit. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34)
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Specification