The performance and marketability of eco-friendly vehicles highly depend on its high [606311]
Abstract
The performance and marketability of eco-friendly vehicles highly depend on its high
voltage battery system. Lithium-ion pouch cells have advantages of high energy density and cost-
effectiveness than other types of batteries. However, due to their low mechanical stability, their
characteristics are strongly influenced by external conditions. Especially, external pressure on a
pouch cell is a crucial factor for the performance, life cycle and structural safety of battery pack.
Therefore, optimizing pressure level has been a critical consideration in designing battery pack
structures for lithium-ion pouch cell. In this work, we developed an optimized structure of the
battery module and pack to apply appropriate pressure on pouch cells. They also include a
standardization strategy to meet the varied demand in capacity and power for automotive
application. The footprint of the cell is standardized and the thickness of the cell is varied according
to the capacity of a cell which is determined by the number of electrodes and thickness of active
materials. The module and pack structures comprise standard and unique parts. The standard parts
hold a cell to ensure structural stability and the unique parts are designed to absorb varied thickness
of a cell, respectively. We have studied the characteristics of cells according to the applied pressure
to define the optimum point. Thickness changes, evolved pressure and capacity of a cell have been
measured under varying external pressures. Pack level numerical simulations and tests are
performed to verifying the performance, life-cycle and safety. According to the test results, the
developed cell and pack meet the specific requirements. The optimized pressure level has been
studied and the standardization strategy for cell and pack is developed. By adopting the proposed
design, it is expected that performance and price compatibility of the battery system can be
improved.
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