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This paper presents a high accuracy state-of-charge (SOC) estimation of a Li-Ion battery pack. Specifically, to overcome the difference in electrochemical characteristics among Li-Ion cells and to improve accuracy of SOC estimation, screening processes for the selection of the cells that have similar electrochemical characteristics has been previously implemented to improve accuracy of SOC estimation...
This paper presents efficiency measurements for a 125 V/63 F supercapacitor module (SC) and a 96 V/90 Ah lithium-ion (li-ion) battery system as a function of charge-discharge current frequency. The result would be useful in the design of efficient power flow control in systems using SCs and li-ion batteries as parallel energy storages, and offers a possibility to predict energy storage power losses...
“Sunracers”, special solar cars using exclusively the electricity drawn from their embedded photovoltaic generator and designed to compete in solar races can be considered as special hybrid vehicles. This paper deals with the evolution of the serial hybrid architecture of the sunracer “Solelhada”. This new architecture, decoupling the bus voltage from the battery state of charge by means of an inserted...
Battery management system (BMS) is an integral part of the electric vehicle (EV) and the hybrid electric vehicle (HEV).The BMS performs the tasks by integrating one or more of the functions, such as sampling the voltages of the battery cells and the temperatures in the battery module, sampling the voltage of the battery, sampling the current of the battery, as well as cells balancing and determining...
In order to minimize few problems of voltage balancing, a new approach of screening process for Li-Ion series battery pack is proposed in this paper. Pulse type discharging/charging currents are applied for various state-of-charge (SOC) points to select the cells with similar voltage variance. This process matches open circuit voltage (OCV)-SOC relations, therefore SOC balancing can be achieved using...
In modern era the utilization of battery empowered systems is growing exponentially. In the goal to achieve an optimal system performance, the employment of a BMS (Battery Management System) is inevitable. Data acquisition is an elementary operation of the BMS. Usually a battery is composed of several cells. Therefore, a multiplexed ADC (A/D Converter) is employed for acquiring each cell data. It...
Management technology for the lithium-ion traction batteries is the key research point for electric vehicles (EV). The states of temperature, current, single voltage, state of charge (SOC) and state of energy (SOE) should be acquired and evaluated timely. This paper has designed a battery state monitor system for the EV batteries based on LabView. Combined with the Extended Kalman Filter (EKF) of...
The state of charge (SOC) estimation algorithm uses the model parameter, which includes capacity, open circuit voltage (OCV), resistance and capacitance. These model parameter values are subject to be changed at varying temperatures. In order to estimate SOC for temperature variation, it is indispensable to include the temperature effect on battery's performance. In this paper, the state of charge...
This paper mainly discusses a distributed battery management system (BMS) that used for hybrid electrical vehicle (HEV) and the research on Lithium-ion battery based on the model of PNGV. The BMS presented is composed with the distributed and integrated module, the distributed modules(DM) takes charge of measuring the parameters of voltage and temperature accurately and in time, communicate with the...
This paper introduces a theory for the development of a fully automated multiple chemistry battery charger. This can be possible through the detection of battery chemistry. The paper presents an algorithm to differentiate between Ni based, Li-ion and Sealed Lead Acid (SLA) batteries through the analysis of voltage profile during charging and discharging periods. The algorithm was implemented and tested...
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