Device for determining cell voltages across series-connected battery cells and method for determining cell voltages
AssigneeVitesco Technologies GmbH
InventorsMatthias Ridder, Magnus Jaster
Life of this patent
Estimating the term…
Abstract
A device for determining cell voltages across series-connected battery cells of a cell stack is provided. The battery cells are combined to form packs having a plurality of series-connected battery cells. Each pack has an associated voltage measuring device for determining the cell voltages of the individual battery cells of the respective corresponding pack. The device has a voltage follower for at least two adjacent packs, which is connected to the current path between the two adjacent packs and receives a potential of the one pack as input signal, and also a reference voltage, and provides a supply voltage for the voltage measuring device of the other pack at low impedance as output signal.
Claims10
A device for determining cell voltages across series-connected battery cells of a cell stack, the battery cells being combined to form packs including a plurality of series-connected battery cells, the device comprises:
- a voltage measuring device associated with each pack for determining the cell voltages of each battery cell of the respective corresponding pack;
- a voltage follower for at least two adjacent packs, the voltage follower connected to a current path between two adjacent packs, the voltage follower receiving a potential of the one pack as an input signal and a reference voltage;
- and
- providing a supply voltage for the voltage measuring device of the other pack at low impedance as an output signal,
- wherein the voltage follower has a bypass circuit and an amplifier circuit, through which there are alternative flows during operation.
A battery for an electrically operated vehicle, the battery comprising:
- at least a number of series-connected battery cells of a cell stack,
- multiple packs including combined battery cells and including a plurality of series-connected battery cells, and
- a device for determining cell voltages of the series-connected battery cells, the device comprising:
- a voltage measuring device associated with each one of the packs for determining the cell voltages of each battery cells of the respective corresponding pack;
- a voltage follower for at least two adjacent packs, the voltage follower connected to a current path between two adjacent packs, the voltage follower receiving a potential of the one pack as an input signal and a reference voltage, and providing a supply voltage for the voltage measuring device of the other pack at low impedance as an output signal;
- and
- an upstream voltage follower for the voltage follower of each individual pack from the second pack to the last pack.
A method for determining cell voltages across series-connected battery cells of a cell stack, the method comprising:
- providing multiple packs including a plurality of series-connected battery cells;
- and
- determining the cell voltages of each individual battery cell of the respective pack by way of a voltage measuring device associated with each pack;
- wherein a voltage signal provided at high impedance from a potential of a pack is used in impedance-converted form as a supply voltage for the voltage measuring device of the adjacent pack, and
- wherein the impedance conversion is only performed when the associated voltage measuring device is in a waking state.
Dependencies are inferred from the claim text.