DESIGN AND OPTIMIZATION OF LIGHTWEIGHT LITHIUMION BATTERY PROTECTOR WITH 3D AUXETIC META STRUCTURES
This research study involves the design and optimization of sandwich structure based on auxetic structure to protect the battery system for electric vehicle (EV) undergoing ground impact load. In this study, a pouch battery system is used due to great potential to be the next Li-Ion battery for E...
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| Format: | Final Project |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/54865 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | This research study involves the design and optimization of sandwich structure based
on auxetic structure to protect the battery system for electric vehicle (EV) undergoing
ground impact load. In this study, a pouch battery system is used due to great potential
to be the next Li-Ion battery for EV due to its simplicity, higher energy density, and
higher space efficiency compared to cylindrical or prismatic battery cells. However,
just like the other form of Li-Ion battery, the pouch battery cells have a high fire risk
due to the battery deformation.
The sandwich structure is designed to prevent battery deformation due to ground
impact. The core of the sandwich structure is filled with auxetic structure that has gone
through optimization to maximize specific energy absorbed (SEA). Its performance is
analyzed with non-linear finite element method. Five geometrical variables of the
auxetic structures were analyzed using Analysis of Variance and optimized using
Taguchi’s method. The optimum control variables are double-U hierarchal (DUH), the
cross-section’s thickness = 2 ????????, the length of the cell = 10 ????????, the width of the cell
= 17 ????????, and the bending’s height = 3 ????????.
The optimized geometries are then arranged into three different sandwich structure
configurations. The optimized sandwich structure has optimized DUH cell as the core
that has been enlarged to 200% in length (single cell’s dimension 38 × 38 × 24 ????????),
arranged in 11 × 11 × 1 cells resulting in total dimension and mass of 189 × 189 ×
12 ???????? and 0.75 ????g. The optimized sandwich structure shows that the pouch battery
cells are able to be protected very well from ground impact load with the maximum
deformation of 1.92 ????????, which is below the deformation threshold for battery failure.
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