Evaluating Air‐Cooling Performance of Lithium‐Ion‐Battery Module with Various Cell Arrangements

Abstract

The significant heat generated during the operation of lithium‐ion batteries raises the battery temperature thereby leading to performance degradation and thermal runaway in a thermal abuse environment. Therefore, a simple but effective battery thermal management system (BTMS) is crucial to achieve the permissible operating temperatures. In this work, the performance of air‐cooled BTMS is evaluated by changing the arrangement of cells under discharging conditions. Seven distinct arrangements (trapezoidal, slanted, cross, aligned, staggered, tilted square, and zigzag) of lithium‐ion cells are investigated in a rectangular battery pack. Two‐way coupling of 1D electrochemical model and 2D conjugate thermal‐fluid model is employed. The increasing Reynolds number reduces the cell temperature due to augmented convective effects. Under otherwise identical conditions, the zigzag cell arrangement outperforms the other cell arrangements but at the expense of the highest pressure drop (≈threefold). Particularly, the values of average and maximum cell temperature are reduced by ≈5K and ≈4K, respectively, for Re = 1000 at 1C in comparison to the aligned cell arrangement. Similarly, the least favorable performance is predicted by the trapezoidal, slanted, and cross‐cell arrangements. Finally, a performance plot is suggested considering the trade‐off between the power requirement and the cooling enhancement.

Analysis of Thermal Management Strategies for 21700 Lithium-Ion Batteries Incorporating Phase Change Materials and Porous Copper Foam with Different Battery Orientations

“…Heat pipes and fins have been found to be effective cooling devices for BTMS [9][10][11][12][13][14][15][16][17]. Other approaches include using thermoelectric cooling techniques [18][19][20][21], manifold [22][23][24][25][26], cell arrangement [27], battery pack layout within the battery cabin [28], cooling channels [29][30][31][32][33], cold plates [34,35], and nanofluids [36][37][38][39]. On the other hand, Khateeb, et al [40], Duan and Naterer [41], Li, et al [42], and Wilke, et al [43] have experimentally confirmed that PCMs offer a significant improvement to BTMS.…”