Abstract
An electrochemical-thermal coupling model combined with an electrically connected cylindrical cell model was built to produce a structural design that prevents thermal runaway propagation of cells on the battery module. Additionally, the characteristics of different modes of heat transfer of each cell during thermal runaway propagation of the battery module in an open environment were studied by changing the spacing of adjacent cells, the solder joint area, and the cross-sectional area of the electrode tab. Heat conduction is usually the main heat transfer mode for cells directly connected to the thermal runaway cell, while radiation heat transfer is the main heat exchange mode for cells that are not directly connected to thermal runaway cell. Increasing spacing can prevent thermal runaway propagation by the three heat transfer modes. Similarly, a smaller total solder joint area and cross-sectional area of the electrode tab can inhibit thermal runaway propagation through heat conduction transfer modes if conditions permit.
Highlights
In recent years, as high-energy, large-capacity lithium-ion cells have become widely used in power fields, including in electric vehicles, ships, and new energy storage, combustion and explosion accidents have occurred frequently
In the present study, the characteristics of different modes of heat transfer of each cell in the thermal runaway propagation of the battery module in an open environment were analyzed based on a combination of a computational fluid dynamics (CFD) numerical simulation method, an electrochemical-thermal coupling model, and an electrically connected cylindrical cell model; the parameters of the cell spacing of adjacent cells, the solder joint area, and the cross-sectional area of the electrode tab were examined
It can be concluded from the preceding analysis that the spacing distances of C2, C4, C8 and thermal runaway cell C5 are the same, but the distances between them and C5 through the electrode tab are different; this results in the change of the heat transfer mode of these three cells receiving the heat from C5
Summary
As high-energy, large-capacity lithium-ion cells have become widely used in power fields, including in electric vehicles, ships, and new energy storage, combustion and explosion accidents have occurred frequently. It is evident that the influencing factors and suppression methods of thermal runaway propagation of the lithium-ion battery pack have been the main foci in the existing research and that the heat transfer modes after thermal runaway in the lithium-ion battery pack have not been as extensively studied. In the present study, the characteristics of different modes of heat transfer of each cell in the thermal runaway propagation of the battery module in an open environment were analyzed based on a combination of a CFD numerical simulation method, an electrochemical-thermal coupling model, and an electrically connected cylindrical cell model; the parameters of the cell spacing of adjacent cells, the solder joint area, and the cross-sectional area of the electrode tab were examined. The effects of the three influencing factors on the three heat transfer modes of cells were empirically studied to provide guidance for a structural design that can prevent the thermal runaway propagation of cells on the battery module
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