In the open and closed space environments, the influence of spacing on battery pack thermal runaway propagation is studied. The mechanism of thermal runaway propagation for the lithium-ion battery pack is analyzed. The experimental results show that when the state of charge (SOC) of the battery is 100%, and the spacing is greater than 2 mm in the horizontal direction and 8 mm in the vertical arrangement, battery pack thermal runaway propagation hardly occurs in an open environment. In a closed environment, there is less chance of uncontrolled heat transmission in batteries when the rate of increase in the battery temperature is less than 0.66 °C s−1. When the horizontal spacing is more than 4 mm or the vertical spacing of the battery is more than 8 mm in a closed environment, thermal runaway propagation cannot occur in the batteries. The research results provide some reference for the arrangement of lithium-ion battery packs in transportation and storage.
Spacing of the battery pack Thermal runaway propagation Lithium-ion battery Open environment Closed space
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The authors are grateful for the support given by National Natural Science Foundation of China under Grant No. 51874184, Key R&D Programs (Social Development) in Jiangsu Province under Grant No. BE2016771, Key Natural Science Foundation in Jiangsu Province under Grant No. 18KJA620003, and Jiangsu Project Plan for Outstanding Talents Team in Six Research Fields (TD-XNYQC-002).
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