Assessment of capacity fade in lithium batteries

点击翻译按钮获取中文摘要

Thermal management for commercial lithium ion battery systems is widely accepted as a critical component in the production of durable power systems. Battery operational performance and charging performance are impacted by battery temperatures and temperature gradients throughout the pack and the batteries themselves. To control these temperature gradients and limit the negative impacts of operating temperatures, thermal management strategies are considered for battery systems. These strategies include air versus liquid cooling, and face versus edge cooling. While these strategies are able to greatly control the operating temperature they also introduce incremental costs to the entire battery power systems, as well as additional maintenance and service requirement. As such, justification for the merit of these battery systems is critical for companies specializing in these thermal management systems. While increases in the battery performance due to advanced thermal management strategies is not a sufficient justification, the issue of long term battery degradation (capacity fade) due to non-ideal temperatures and gradients is thought to be of more significance. The research described in this proposal aims to develop a framework upon which capacity fade can be evaluated as a driving factor in the importance of thermal management systems for lithium ion batteries. The proposed research seeks to predict the capacity fade in a battery system due to the existence of thermal gradients within the cell. A collaborative approach is planned for the proposed research combining the complementary expertise and skills of the applicant and the supporting organization. The result of the proposed research will be useful for the supporting organization's effort to illustrate the importance of their thermal management system and also for the design and development of their next generation systems.