Battery thermal control is an important factor for achieving desired performance and calendar life for multi-cell batteries in hybrid electric vehicles. Automakers and their battery suppliers are paying increased attention to battery thermal management, especially with regard to life and related warranty costs. A robust design for thermal management is needed to ensure that certain parameters remain within design specifications under a variety of ambient and load conditions. For example, cells/modules in a pack must remain below a maximum temperature, temperature differences between cells must be below a desired value, and parasitic power must not exceed a designed value. Finite element thermal analysis, along with optimization and design for six sigma processes were used to evaluate alternatives that reduce temperature distribution and improve overall temperature uniformity among cells. A transient thermal analysis was also performed using the FreedomCAR 40kW power-assist profile and the thermal response for various flow rates was presented. These methods showed how variation in input parameters and conflicting design constraints could be accounted for when designing battery thermal management systems. For this paper, we modeled a Panasonic prismatic NiMH module with air-cooling, but the techniques can be applied to any battery configuration.
Improving battery thermal management using design for six sigma process
Verbesserung des thermischen Batterie-Betriebssystems mit Hilfe des 6 Sigma Prozesses
2003
14 Seiten, 14 Bilder, 10 Quellen
Conference paper
Storage medium
English
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