| 摘要 |
The invention relates to an energy storage device comprising a battery (2) with at least one battery cell and two poles, two connection points (5, 6), each of which is directly or indirectly connected to a pole of the battery (2), for connecting to an external current circuit for charging and discharging the battery (2), and a charge state monitoring device (29) for determining a charge state of the battery (2). The energy storage device (1) comprises at least one additional energy storage element (3), which is designed differently than the battery cell, a connection circuit (4) for directly or indirectly connecting the energy storage element (3) to at least one of the poles of the battery (2), and at least one connection point (5, 6). The connection circuit (4) is designed and contacted such that an energy storage element current which is in a specified ratio to the total current flowing through the energy storage device (1) is charged into and/or discharged from the energy storage element (3). A voltage measuring device (28) contacts the additional energy storage element (3) in order to measure the energy storage voltage dropping on the energy storage element (3), and the charge state monitoring device (29) is designed to determine the charge state of the battery (2) dependent at least on the energy storage voltage. |
