Thermal modelling of new Li-ion cell design modifications

Abstract

The effects of material and design modifications on the temperature distribution of Li-ion cells are simulated numerically. A two-dimensional anisotropic cylindrical coordinate model with linear triangular finite elements is used to simulate the steady-state temperature distribution within the cell. The cell's material and geometry are changed. New cell materials are investigated for thermal performance: a negative electrode of variously-oriented carbon nanotubes, as well as separators made of Separion, of Al 2 O 3 containing Cr particles or of BeO containing Be and Si particles. The cell's diameter and length are varied. A new cell design with an internal cooling tube is proposed. The effect of cooling tube diameter upon cell temperature and the energy efficiency of cooling are investigated. This simple design change significantly improves the temperature distribution at marginal cost. Berechnung der Temperaturverteilung in konstruktiv veränderten

Modeling the Performance and Cost of Lithium-Ion Batteries for Electric-Drive Vehicles, Third Edition

“…An important requirement for calculating heat transfer rates within the cell is to estimate the composite conductivities of the cell layers both parallel to the layers and across the layers. The resulting conductivities vary considerably with the relative thicknesses of the layers as shown in Table 6.3, for which the results are consistent with the literature [41][42][43][44][45]. These values for conductivities and a range of cell dimensional parameters (Table 6.4) were employed in selected arrangements for calculating heat transfer rates with the FlexPDE model for 70 representative cells that covered a broader range of variables than is needed for practical cells.…”

Modeling the performance and cost of lithium-ion batteries for electric-drive vehicles.

“…The resulting conductivities vary considerably with the relative thicknesses of the layers as shown in Table 4.1, for which the results are consistent with the literature. [39][40][41][42][43] These values for conductivities and a range of cell dimensional parameters (Table 4.2) were employed in selected arrangements for calculating heat transfer rates with the FlexPDE model for 70 representative cells that covered a broader range of variables than is needed for practical cells. For each of these cells, the FlexPDE model calculated the temperature difference between the cell center and the module housing per unit of heat generation, T/q ( o C/W), and the fraction of the total heat that was transferred through the edge of the cell, q e /q.…”

A review on battery management system from the modeling efforts to its multiapplication and integration

“…Notably, some researchers have also proposed new BTMSs, such as jet cooling and boiling cooling . More importantly, due to insufficient vertical temperature gradient control caused by external cooling strategies at high heat generation, the internal cooling strategies were investigated to mitigate battery heat problems . Bandhauer et al utilized a passive liquid‐vapor phase change heat removal inside micro‐channels embedded into the cell to demonstrate the possible performance improvement based on a 3D electrochemical‐thermal model.…”