Electrochemical Battery Models on the Cell Processor

The rising cost of fossil fuels, together with a push for more eco-friendly methods of transportation, has increased interest in and demand for electrically powered or assisted vehicles. The majority of these electric or hybrid electric vehicles will be, for the foreseeable future, powered by batteries. One of the major problems with batteries is their aging. For batteries, aging means that the maxi-mum charge they can store decreases as number of charge/discharge cycles increases. Aging also means that after a certain number of charge/discharge cycles, the battery will fail. In lead-acid batteries, one of the major phenomenon that promotes battery failure is the development of a non-uniform concen-tration gradient of electrolyte along the electrodes ' height. This phenomenon is known as electrolyte stratification. This thesis develops a simple two-level circuit model that can be used to model electrolyte stratifica-tion. The two-level circuit model is justified experimentally using digital Mach-Zehnder interferometry and is explained theoretically by means of two different electrochemical battery models. The experi-ments show how the usage of the electrode varies along its height while the simulations indicate tha