Novel Lightweight and Protective Battery System Based on Mechanical Metamaterials
ACTA MECHANICA SOLIDA SINICA(2021)
摘要
The challenges facing electric vehicles with respect to driving range and safety make the design of a lightweight and safe battery pack a critical issue. This study proposes a multifunctional structural battery system comprising cylindrical battery cells and a surrounding lightweight lattice metamaterial. The lattice density distribution was optimized via topological optimization to minimize stress on the battery during compression. Surrounding a single 18650 cylindrical battery cell, non-uniform lattices were designed featuring areas of increased density in an X-shaped pattern and then fabricated by additive manufacturing using stainless steel powders. Compression testing of the assembled structural battery system revealed that the stronger lattice units in the X-shaped lattice pattern resisted deformation and helped delay the emergence of a battery short circuit. Specifically, the short circuit of the structural battery based on a variable-density patterned lattice was ∼166% later than that with a uniform-density lattice. Finite element simulation results for structural battery systems comprising nine battery cells indicate that superior battery protection is achieved in specially packed batteries via non-uniform lattices with an interconnected network of stronger lattices. The proposed structural battery systems featuring non-uniform lattices will shed light on the next generation of lightweight and impact-resistant electric vehicle designs.
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关键词
Lightweight, Lattices, Metamaterials, Structural battery, Battery safety, Internal short circuit
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