Energy Density of Cylindrical Li-Ion Cells: A Comparison of Commercial 18650 to the 21700 Cells
By Jason B. Quinn, T. Waldmann, K. Richter, M. Kasper, M. Wohlfahrt‐Mehrens. 2018
175 citations recorded by the source corpus.
The standard format for cylindrical Li-ion cells is about to change from 18650-type cells (18mm diameter, 65mm height) to 21700type cells (21mm diameter, 70mm height). We investigated the properties of five 18650 cells, three of the first commercially available 21700, and three types of the similar 20700 cells in detail. In particular, the (i) specific energy/energy density and electrode thickness, (ii) electrode area and cell resistance, (iii) specific energy as a function of discharge C-rate, as well as (iv) heating behavior due to current flow are analyzed. Finally, the production effort for cells and packs are roughly estimated for 21700 cells compared to 18650 cells. © The Author(s) 2018. Published by ECS. This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 License (CC BY, http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse of the work in any medium, provided the original work is properly cited. [DOI: 10.1149/2.0281814jes]
Subfields: Automotive Engineering, Electrical and Electronic Engineering
View Paper: https://www.semanticscholar.org/paper/19f369edb2f2abdf99bba80ddd296446d708dbe0
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Citations in the corpus
- A Review of Phase Change Materials for the Thermal Management and Isothermalisation of Lithium-Ion Cells (2019, background): “[30] compared the energy density of the 21700 cell against an 18650 cell and found that the energy content can be as much as 50% greater than an 18650 cell.”