Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8072301 | Energy | 2018 | 17 Pages |
Abstract
Testing of lithium ion batteries is necessary in order to understand their performance, to parameterise and furthermore validate models to predict their behaviour. Tests of this nature are normally conducted in thermal/climate chambers which use forced air convection to distribute heat. However, as they control air temperature, and cannot easily adapt to the changing rate of heat generated within a cell, it is very difficult to maintain constant cell temperatures. This paper describes a novel conductive thermal management system which maintains cell temperature reliably whilst also minimising thermal gradients. We show the thermal gradient effect towards cell performance is pronounced below operating temperature of 25â¯Â°C at 2-C discharge under forced air convection. The predicted internal cell temperature can be up to 4â¯Â°C hotter than the surface temperature at 5â¯Â°C ambient condition and eventually causes layers to be discharge at different current rates. The new conductive method reduces external temperature deviations of the cell to within 1.5â¯Â°C, providing much more reliable data for parameterising a thermally discretised model. This method demonstrates the errors in estimating physiochemical parameters; notably diffusion coefficients, can be up to four times smaller as compared to parameterisation based on convective test data.
Related Topics
Physical Sciences and Engineering
Energy
Energy (General)
Authors
M.I. Ardani, Y. Patel, A. Siddiq, G.J. Offer, R.F. Martinez-Botas,