Cycling a battery pack eventually causes individual cells to become out of balance. The first example that we will share with you today reflects one of the important tasks of the BAMS, cell balancing. The battery cell block created in this way can now be part of a system like a model whose architecture reflects our design needs and specifications. Repeating the estimation procedure at different temperatures yields a lookup type of matrix that outputs the OCV, resistance, and capacitance of the elements as a function of state of charge and temperature. With a different values for different levels of SOC. We saw that the result of each estimation procedure was a vector of equivalent circuit parameters. In a previous video, we showed how to create a battery cell equivalent circuit and how to parameterize it using controlled temperature experimental data. The same unit cell used in the previous example, is used to be used in this one to create a model of the real plant. Secondly, we we'll show how a nonlinear observer can keep track of the state of charge of the cell. We will show how Simulink can mold physical plant and controller for the battery pack and it's balancing circuits and provide results in terms of the electrical and thermal behavior. We will begin with a model of a simple three years 1P battery pack architecture, that starts at low SOC and the auto balance. This video shows examples of typical battery management system tasks, such as balancing, thermal analysis, and SOC estimation. This task is trusted to the battery management system which measures current, voltage, and temperature of each cell and controls that cooling, balancing and power elements of the pack, as well as operates the disconnect breakers for startup and power off. Modern battery systems, especially those based on lithium ion Chemistries require careful monitoring and control of the state of each individual cell to ensure safety of operation, good performance, and acceptable durability. I am a mechanical engineer with a bachelor's degree from the University of Buenos Aires and master and PhD degrees from the University of British Columbia.īefore joining MathWorks seven years ago, I worked for years for the government of Canada studying a low temperature fuel cells at the Institute for fuel cell innervation of the National Research Council in Vancouver, BC. My name is Javier Gazzarri and I am an application engineer at MathWorks, specialized in design and analysis of battery systems, using modeling and simulation.
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