Coupling Fractional Thermal Runaway Calorimetry (FTRC) Results with Statistical Analysis Methods

Walker, William ; Darst, John ; Finegan, Donal ; Bayles, Gary ; Johnson, Kenneth ; Darcy, Eric ; Rickman, Steven

关键词: LITHIUM BATTERIES;    THERMAL BATTERIES;    THERMAL ANALYSIS;    THERMAL INSTABILITY;    TEMPERATURE EFFECTS;    STATISTICAL ANALYSIS;    HEAT MEASUREMENT;    CALORIMETERS;    REGRESSION ANALYSIS;    MATHEMATICAL MODELS;    SAFETY;    RANDOM VARIABLES;    EJECTA;   

RP-ID  :  JSC-E-DAA-TN65257

学科分类：航空航天科学

美国|英语

来源: NASA Technical Reports Server

【 摘 要 】

Important factors to consider when optimizing Lithium-ion (Li-ion) battery thermal management systems, from a battery safety perspective, include the total energy released during a single cell thermal runaway (TR) event and the fraction of the total energy that is released through the cell casing versus through the ejecta material. A fractional thermal runaway calorimeter (FTRC) was used to examine the TR behavior of the following 18650-format Li-ion cells: (1) Molicel 18650-J, (2) LG 18650-HG2, (3) Samsung 18650-30Q, (4) 3.35 Ah LG 18650 test cell, (5) Sony 18650-VC7, and (6) LG 18650-MJ1. These cells were intentionally selected to represent a variety of manufacturers, chemistries, capacities, and safety features. Because of the large number of random and non-random variables associated with the FTRC results, a linear regression model, developed using engineering statistical methods, was utilized to provide final interpretation of the TR behavior for each cell type and design variable combination.