Battery Markup Language (BatML) Standard
Example Models for Batteries
Example 1: Unrolled Cell (Electrochemical/Thermal)
In this example (located at in the VIBE depository at trunk/examples/case1/), we simulate the unrolled cell described in Srinivasan and Wang (Srinivasan and Wang 2003). The main model inputs for the simulation are provided in the table below:
| Physical Properties | Units | Total | Carbon Electrode (Anode) | Lithium Electrode (Cathode) | Separator |
|---|---|---|---|---|---|
| Density (r) | Kg/m3 | 2500 | 1500 | 1200 | |
| Heat Capacity (Cp) | J/Kg-K | 700 | 700 | 700 | |
| Thermal Conductivity | W/m-K | 0.01 | 0.01 | 0.01 | |
| (rCp) avg | J/m3-K | 175x104 | |||
| Height | m | 0.5 | |||
| Width | m | 0.024 | |||
| Thickness | m | 394x10-6 | |||
| Current Density | A/m2 | 35 | |||
| Convective Heat Transfer Coefficient | W/m2-K | 25 |
The battery state file for this example is schematically shown in Fig. 1. The unrolled cell domain is decomposed into zones along the axis based on the expect temperature gradients. Each zone calls its own version of DualFoil. The DualFoil calculations provide the heat source for each of the zones. The thermal component calculations update the temperatures for the each of the zones for the DualFoil calculations. The typical results from these simulations are shown in Fig. 2. As seen in the results, the solution deviates the most with one-way loose coupling and as we increase the degree of coupling (by exchange of information and also using more number of zones), the peak temperature approaches 80˚C – the solution from the fully coupled solution (Srinivasan and Wang 2003).
Figure 1: Battery state file for example 1.
Figure 2: Sample results (electrolyte and electrode potential and concentration, and temperature) for example 1.
References:
-
Srinivasan, V. and C. Y. Wang (2003). "Analysis of Electrochemical and Thermal Behavior of Li-Ion Cells." Journal of the Electrochemical Society 150(1): A98-A106.