A. Tenno (Finland)
Battery, evaluation, software, valve-regulated lead-acid.
Implementing theoretical cell model in battery evaluation software allows for evaluation of many unobservable parameters of the electrodes by total current, terminal volt age and temperature of the surrounding atmosphere of the battery. These parameters include overpotential, reaction rate, porosity, acid concentration, and others. The software can be used for distinguishing between outwardly equal batteries with different backup time and cut-off time. To be of any use, such software needs to be adequate to the type and properties of the battery. In the best case, the model should be calibrated for each battery. From this, it is clear that the software has to be hundreds or even thou sands of times faster than the real charging process to be effective. To satisfy this requirement, the implementation of the theoretical model in software must be optimised, utilising sparse matrix technology, parallel identification of batteries in string, and, where possible, substitution of the distributed parameter model with low-dimension or lumped parameter model. This is implemented in the soft ware discussed in this paper. The paper demonstrates what can be achieved in practise with battery evaluation soft ware and how fast the calculation process is.
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