Abstract
Paper focuses on the topic related to State of Charge (SOC) estimation of the battery modules. The design issues of the electronic circuit suited for very accurate voltage and current measurement used for evaluation of the SOC parameters of battery module (NexSys 12 V) are presented. The SOC evaluation is not described here, but the principles are based on the open-circuit voltage measurement in combination with the coulomb counting method. Both methods are considered within the practical design of the measuring circuit of traction lead-acid batteries connected in series (3 cells). The circuit proposal is verified by the simulation model and consequently by the experimental measurement. Mutual comparisons are done for each battery within the module. The results show a very high accuracy between the simulation and measurement, while the relative tolerance varies from - 7 % to 1 % within wide measuring ranges.
Highlights
Current trends within modern applications utilizing energy storage components require individual approach if State of Charge (SOC) estimation is considered
Reflecting on the expansion of industry 4.0 systems, it is expected to be informed about actual power consumption and SOC of battery powered systems, while online information is reported to operator of the industrial internal logistics
These mentioned facts are the most important if we discuss about automated infrastructure, i.e. when automated guided vehicles (AGV) are the main part of in-house industrial processes
Summary
Current trends within modern applications utilizing energy storage components require individual approach if State of Charge (SOC) estimation is considered. Reflecting on the expansion of industry 4.0 systems, it is expected to be informed about actual power consumption and SOC of battery powered systems, while online information is reported to operator of the industrial internal logistics (inhouse factory dispatching) These mentioned facts are the most important if we discuss about automated infrastructure, i.e. when automated guided vehicles (AGV) are the main part of in-house industrial processes. In order to ensure continuous operation conditions with AGV systems, SOC evaluation is a very important item If this measurement is reliable and accurate, it opens the possibilities of determining the working radius of the AGV system and planning its continuous replacement, eliminating the disruption of smooth industrial processes and maximizing energy storage system lifetime [1]–[6]. At the end of the paper the simulation results are compared with experimental measurements, which were realized by means of a functional sample of the designed system
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