Abstract
We developed the compact battery pack with structural safety and high cooling performance based on numerical simulation for hybrid electric vehicle (HEV) applications. The most important requirement in HEV battery pack is high specific power (kW/kg), which makes lightweight design of battery pack essential. By applying optimization methodology combined with structural finite element analysis, robust and lightweight module frame, which binds dozens of batteries together, was designed to minimize the deformation of batteries in case of swelling or explosion. Efficient cooling system was also achieved through the Pugh decision matrix with computational fluid dynamic analysis, to have a uniform temperature distribution and a minimized pressure drop within the pack under normal charging/discharging conditions. By employing module frame and cooling system based on numerical simulation, the compact design of lithium-ion battery pack was obtained successfully to have structural safety and cooling performance. Experiments were implemented to further validate numerical simulation of thus obtained optimal battery pack design for HEV, and they were found to be in good agreement.
Highlights
A hybrid electric vehicle (HEV) that utilizes an internal combustion engine and an electrical motor has been drawing lots of attention from both environmental and economical points of view and the development of HEV has been getting intensive [1]
We focused on the design of compact battery pack with desired structural safety and high cooling performance
By employing module frame and cooling system based on numerical simulation, a prototype of compact battery pack was manufactured
Summary
A hybrid electric vehicle (HEV) that utilizes an internal combustion engine and an electrical motor has been drawing lots of attention from both environmental and economical points of view and the development of HEV has been getting intensive [1]. It is forecasted that HEV will replace the position of conventional automotive with combustion engine only in the near future [2]. Chemical reaction at high temperatures and can cause swelling or explosion of the battery. Non-uniform temperature distribution in the battery pack may result in premature failure of each cell. We focused on the design of compact battery pack with desired structural safety and high cooling performance. Efficient cooling system was achieved through computational fluid dynamic (CFD) analysis, to have uniform temperature distribution and minimized pressure drop within the pack under normal charging and discharging conditions. By employing module frame and cooling system based on numerical simulation, a prototype of compact battery pack was manufactured. Experiments were carried out on this optimized prototype of battery pack to further validate numerical simulation
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