Apparatus for determining the state of physical properties of rechargeable electric energy storage devices
AssigneeFraunhofer Gesellschaft zur Foerder der angewandten Forschung e. V.
InventorsMichael Birkle, Gunther Grasemann, Hartwig Steusloff
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Abstract
A process for determination of the state of physical properties of recharble electric energy storage device. Process input values of the energy storage device are measured and processed in a computer, in accordance with a predetermined model in the form of closed linear or non-linear multiparametric functions or a heuristic prametering process to generate derived values for physical properties, which are compared with the measured process input values, and the model or estimation is modified for the succeeding measurement.
Claims23
A method of determining a state of charge and other physical properties of a rechargeable electric energy storage apparatus, which storage apparatus is subjected to a process which alters said physical properties, said method comprising the steps of:
- measuring at least one input value for said physical properties during said process;
- processing said at least one input value in a data processor in accordance with a predetermined model in the form of a non-linear mulitparametric function and a heuristic parametering technique, said multiparametric function having more parameters than input values, said processing step including the step of first estimating an unknown solution value for said predetermined model using said heuristic parametering based on characteristic curves and data of known energy storage apparatus, and then estimating derived values for said state of charge and other physical properties, and generating relationships between said derived valued for said state of charge and other physical properties;
- comparing said derived values with the measured input value for said physical properties;
- adapting said predetermined model to minimize differences between said measured input value and derived values;
- and
- determining the state of charge and said other physical properties of said rechargeable electric energy storage apparatus from said comparing step.
Arrangement for determining a state of physical properties of rechargeable electric energy storage apparatus, which apparatus is subjected to a process which alters said physical properties, said arrangement comprising:
- means for measuring at least one input value for said physical properties;
- a microprocessor processing said at least one input value in accordance with a predetermined model in the form of a non-linear multiparametric function and a heuristic parametering technique, said multiparametric function having more parameters than input values, said microprocessor first estimating an unknown solution value for said predetermined model using said heuristic parametering based on characteristic curves and data of known energy storage apparatus, and then estimating derived values for said state of charge and other physical properties, and generating relationships between said derived values for said state of charge and other physical properties;
- an analog to digital converter coupled to receive said at least one measured input value;
- a multiplexer coupled to receive digitized input values from said analog to digital converter and to transmit said digitized input values to said microprocessor;
- timer means, including, a timer-counter circuit, for generating time interval signals to control the timing of measurements of said at least one input value;
- first memory means associated with said rechargeable energy storage apparatus comparing measured input value with derived values for said physical properties generated by said microprocessor;
- an input-output interface unit connected to said microprocessor, said multiplexer, said first memory means and a charge device;
- second and third memory means for receiving programs and data of said rechargeable energy storage means;
- wherein said arrangement determines the state of said physical properties of said rechargeable electric energy storage apparatus from the comparison of the measured input value with said derived values.
Dependencies are inferred from the claim text.