Abstract
This paper presents the results of an analysis using the direct current internal resistance (DCIR) method on a nickel-cobalt-manganese oxide (NCM)-based battery with a nominal capacity of 55.6 Ah. The accelerated degradation test was performed on V0G, V1G, and V2G patterns, representing existing simple power supply, smart charging control, and bi-directional charge/discharge control, respectively. We assumed V0G, V1G, and V2G patterns and conducted charging and discharging experiments according to the set conditions. According to the pattern repetition, changes in the internal resistance of DCIR and AC-impedance were analyzed and battery deterioration was diagnosed. By comparing DCIR and AC-impedance, we confirmed that the changes in internal resistance has a similar trend. In particular, we propose a new DCIR analysis method in the “stop-operation” part rather than the traditional DCIR method. In the case of traditional DCIR method, time is required for the battery to stabilize. However, the newly proposed DCIR analysis method has the advantage of diagnosing the deterioration of the battery during system operation by analyzing the internal resistance without the stabilization time of the battery.
Highlights
This paper presents the results of an analysis using the direct current internal resistance (DCIR) method on a nickel-cobalt-manganese oxide (NCM)-based battery with a nominal capacity of
The resource utilization of electric power for electric vehicle (EV) is made possible via the technologies that move away from the conventional simple power supply (V0G) towards the smart charging control through EV charge control and communication (V1G) and via the bidirectional charge-discharge control (V2G) [5,6]
The validity of the method of DCIR at the “stop-operation” part was verified with respect to the measurement of IR and the diagnosis of battery deterioration
Summary
This paper presents the results of an analysis using the direct current internal resistance (DCIR) method on a nickel-cobalt-manganese oxide (NCM)-based battery with a nominal capacity of. The resource utilization of electric power for EVs is made possible via the technologies that move away from the conventional simple power supply (V0G) towards the smart charging control through EV charge control and communication (V1G) and via the bidirectional charge-discharge control (V2G) [5,6]. It is necessary for the battery deterioration to be diagnosed based on the analysis of the influence of the uni- or bi-directional charge or charge-discharge on the EV battery performance and life through VxG technology
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