An analysis of design parameters for commercial cylindrical 18650 lithium-ion battery cells with different power to energy ratios

Name: Wongtavorn P.

Organization : Chulalongkorn University. Faculty of Engineering

Name: Salee A.

Organization : Chulalongkorn University. Faculty of Engineering

Email : atsawin.s@chula.ac.th

keyword: High power batteries

LCSH: Lithium ion batteries

; Power-to-energy ratio

Abstract: According to the energy and power characteristics of lithium-ion batteries, the batteries were disassembled to analyze their component. Each type of cell performs different features. High power cell is able to supply high current, but has low energy capacity and vice versa. Their output performance definitely reflects their design. However, the relationship between design parameters and their performance is not obviously clarified. This work aims to compare the design parameters of the battery cells and establish relationships between the design parameters and various properties with the power-to-energy ratios (P/E ratio). Four examples of commercial lithium-ion battery cells with different power and capacity ratings were selected and analyzed their physical properties, including size, weight, energy capacity, power, and internal resistance, based on the IEC62660 standard. The P/E ratios of the battery cells can be consequently calculated from the aforementioned tests. The battery cells were then disassembled to analyze their component. The physical characteristics, such as length, thickness, position of the current collector strip, electrical conductivity of the electrodes are subsequently measured. The structure of the electrodes and separator, including the particle size of the active materials and the surface morphology of the separator, are examined using a scanning electron microscope (SEM). The chemical composition of the electrodes are simultaneously analyzed by energy dispersive spectroscopy (EDS) to define the chemistry of electrode materials. Finally, all the investigated parameters are summarized and compared as well as constructed a relationship with the P/E ratios. By this relationship, the battery cell design strategy to obtain the required performance on both energy and power can be well-established

King Mongkut's University of Technology North Bangkok. Central Library

Address: BANGKOK

Email: library@kmutnb.ac.th

Created: 2568

Modified: 2025-12-01

Issued: 2025-12-01

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BibliograpyCitation : ใน สมาคมวิศวกรเครื่องกลไทย และมหาวิทยาลัยเทคโนโลยีราชมงคลอีสาน วิทยาเขตขอนแก่น. คณะวิศวกรรมศาสตร์. สาขาวิชาวิศวกรรมเครื่องกล. การประชุมวิชาการเครือข่ายวิศวกรรมเครื่องกลแห่งประเทศไทย ครั้งที่ 39 (ME-NETT 2025) (pp.1134-1141). ขอนแก่น : มหาวิทยาลัยเทคโนโลยีราชมงคลอีสาน วิทยาเขตขอนแก่น, 2568

eng

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