Energy management device and method for providing an estimated energy value for an energy store
The invention relates to an energy management device ( 100 ) for an energy store ( 106 ), comprising an energy store ( 106 ), an energy storage management apparatus ( 103 ) and an energy estimation apparatus ( 104 ), wherein the energy storage management apparatus ( 103 ) is designed to detect and provide a plurality of energy storage parameters present in the energy store ( 106 ), wherein the energy estimation apparatus ( 104 ) is designed to receive the plurality of energy storage parameters and to provide an estimated energy value from the plurality of energy storage parameters, characterised in that the energy estimation apparatus ( 104 ) selects substantially only electric current parameters from the provided plurality of energy storage parameters and wherein an electric current parameter is a parameter which has an influence on the electric current flow into and/or out of the energy store ( 106 ).
1. An energy management device for an energy storage device, comprising
an energy storage device;
an energy storage management apparatus;
an energy estimation apparatus; and
a range estimation apparatus;
wherein the energy storage management apparatus is adapted to detect and provide a plurality of energy storage parameters present in the energy storage device;
wherein the energy estimation apparatus is adapted to receive the plurality of energy storage parameters and to provide an estimated energy value from the plurality of energy storage parameters;
wherein the energy estimation apparatus selects substantially only electric current parameters from the provided plurality of energy storage parameters;
wherein an electric current parameter is a parameter which has an influence on the electric current flow into and/or out of the energy storage device;
wherein the range estimation apparatus is adapted to convert the estimated energy value into an estimation range;
wherein the range estimation apparatus uses an energy-range curve for converting the estimated energy value into the range, which energy-range curve is represented in electric current parameters;
wherein the energy-range curve has a first and a second curve portion;
wherein the second curve portion of the energy-range curve, which lies in the range of a low energy present in the energy storage device, has been determined with a higher accuracy than the first curve portion of the energy-range curve, which lies in the range of a high energy present in the energy storage device; and
wherein the first curve portion is adapted to the second curve portion such that the energy- range curve forms a continuous curve.
2. The energy management device according to claim 1 , wherein the electric current parameter is at least one energy storage parameter selected from the group of energy storage parameters consisting of:
electric current balancing value;
electrical resistance of the energy storage device;
instantaneous voltage at the energy storage device;
instantaneous electric current at the energy storage device;
energy storage device temperature;
age of the energy storage device; and
inter-cell voltage difference of individual cells of the energy storage device.
3. The energy management device according to claim 1 , wherein a transition from the first curve portion to the second curve portion of the energy-range curve depends upon at least one transition criterion selected from the group of transition criteria consisting of:
an operating time;
a state of charge of the energy storage device;
a minimum distance to a destination; and
a trigger event.
4. The energy management device according to claim 1 , wherein the energy estimation apparatus is set up to predict the temperature of the energy storage device and/or the internal resistance of the energy storage device.
5. The energy management device according to claim 1 , further comprising:
a display apparatus;
wherein the display apparatus is configured to display the estimated range.
6. Transport means having an energy management device according to claim 1 .
7. A method for providing an estimated energy value of an energy storage device, comprising: detecting a plurality of energy storage parameters present in the energy storage device; providing the plurality of detected energy storage parameters present in the energy storage device;
receiving the plurality of energy storage parameters; providing an estimated energy value from the plurality of energy storage parameters; wherein, the step of providing the estimated energy value comprises selecting substantially only electric current parameters; and wherein an electric current parameter is a parameter which has an influence on the electric current flow into and/or out of the energy storage device; the method further including a step of converting the energy estimate into an estimated range; wherein an energy-range curve represented in current parameters is used to convert the energy estimate into the range; wherein the energy-range curve has a first and a second curve portion;
wherein the second curve portion of the energy-range curve, which lies in the range of a low energy present in the energy storage device, has been determined with a higher accuracy than the first curve portion of the energy-range curve, which lies in the range of a high energy present in the energy storage device; and
wherein the first curve portion is adapted to the second curve portion such that the energy range curve forms a continuous curve.