| dc.description.abstract | Nowadays, lithium battery circuit models, some are too simple, can not simulate the cycle time and temperature effects. One with fully functioning model can only simulate discharging behavior, not charging. In addition, at this stage, circuit models are only for specific manufacturer, not an universal solution.
This paper presents the circuit model for both battery charging and discharging. Based on the manufacturer’s data sheet, the model parameters are extracted to derive the coefficients of the expressions of the major components in the circuit model. This experiment used Lithium iron phosphate ion battery for a comparison. Results show that, at the battery discharging and charging conditions, the errors between the measurement results and the simulated results. In discharging condition, when the battery voltage reaches cut-off voltage 2.5V, the time is 6480 seconds, the error is 3.12%. And the maximum error voltage is 16mV, in 0.501%. In charging condition, when the battery voltage reaches a predetermined nomial voltage 3.65V, the time is 2880 seconds, the error is 0.712%. And the maximum error voltage is 37mV, in 1.072%. Thus, the proposed circuit model can be used for battery simulation. It not only diminishes the risk of experimental safety but also decreases the cost from battery manufacturer.
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