The specific heat capacity of lithium ion cells is a key parameter to understanding the thermal behaviour. From literature we see the specific heat capacity ranges between 800 and 1100 J/kg.K Heat capacity is a measurable physical quantity equal to the ratio of the heat added to an object to the resulting temperature change.
This person is not on ResearchGate, or hasn't claimed this research yet. Lithium‐ion batteries generate considerable amounts of heat under the condition of charging‐discharging cycles. This paper presents quantitative measurements and simulations of heat release.
In the simple method proposed previously by the authors to estimate heat generation in lithium-ion batteries, 7, 8 a most simple internal equivalent circuit is used, namely, a series connection of emf E and an equivalent internal resistance Req as shown in Figure 1.
Lithium-ion batteries should continuously be operated at the optimum temperature range 15∼40∘C for the best performance. Surface temperature monitoring is critical for the safe and efficient operation of the battery.
During charge, initial endothermic cooling and subsequent exothermic heating beyond 55% state-of-charge were observed. At the C /2 rate of discharge (which is considered a medium rate), the heat dissipated was 17 mW/cm 3 for the Li x C/LiNiO 2 cell and 11.2 mW/cm 3 for the Li x C/75% LiCoO 2, 25% LiNiO 2 cell.
Lithium-ion batteries are becoming practically used for high power applications such as electric vehicles. For this purpose, some estimation technique of battery heat generation is inevitable.