Abstract
In the majority of applications using lithium-ion batteries, batteries are exposed to some harmonic content apart from the main charging/discharging current. The understanding of the effects that alternating currents have on batteries requires specific characterization methods and accurate measurement equipment. The lack of commercial battery testers with high alternating current capability simultaneously to the ability of operating at frequencies above 200 Hz, led to the design of the presented experimental setup. Additionally, the experimental setup expands the state-of-the-art of lithium-ion batteries testers by incorporating relevant lithium-ion battery cell characterization routines, namely hybrid pulse power current, incremental capacity analysis and galvanic intermittent titration technique. In this paper the hardware and the measurement capabilities of the experimental setup are presented. Moreover, the measurements errors due to the setup’s instruments were analysed to ensure lithium-ion batteries cell characterization quality. Finally, this paper presents preliminary results of capacity fade tests where 28 Ah cells were cycled with and without the injection of 21 A alternating at 1 kHz. Up to 300 cycles, no significant fade in cell capacity may be measured, meaning that alternating currents may not be as harmful for lithium-ion batteries as considered so far.
Highlights
Today, lithium-ion batteries (LIBs) are by far the most common energy storage solutions in mobile devices such as electric vehicles (EVs), drones, computers, and phones
The setup was designed to test LIB cells intended for EV traction applications with large charging rates (C-rate), i.e., 28 Ah
The DGC and current ripple generator (CRG) boards were connected in a power panel with 16 outputs, one per LIB cell
Summary
Lithium-ion batteries (LIBs) are by far the most common energy storage solutions in mobile devices such as electric vehicles (EVs), drones, computers, and phones. With the growth of the LIB market, LIB testing instruments, LIB characterization and modeling methods, as well as, measuring techniques applied to LIBs may be improved Techniques such as hybrid pulse power current (HPPC), incremental capacity analysis (ICA), galvanic intermittent titration technique (GITT), and electrochemical impedance spectroscopy (EIS) can advance LIB testers. The main LIB technological advances have been focusing essentially in dc current related features, like for instance life cycle or charge acceptance For this reason, for large LIB cells intended for automotive.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.