Assessment of capacity fade in lithium batteries

商业锂离子电池系统的热管理被广泛接受为商业锂离子电池系统的关键组成部分。 生产耐用的电力系统。电池操作性能和充电性能是 受电池温度和整个电池组和电池本身的温度梯度的影响。 为了控制这些温度梯度并限制操作温度的负面影响， 考虑用于电池系统的管理策略。这些策略包括空气冷却与液体冷却， 以及面对边冷却。虽然这些策略能够极大地控制操作温度， 也会增加整个电池电源系统的成本，以及额外的维护和 服务要求。因此，这些电池系统的优点的理由对公司来说至关重要 专门研究这些热管理系统。虽然电池性能的提高，由于先进的 热管理策略不是一个充分的理由，长期电池退化的问题 由于非理想的温度和梯度而引起的容量衰减（capacityfade）被认为是更重要的。 本提案中描述的研究旨在开发一个框架， 被评估为锂离子电池热管理系统重要性的驱动因素。的 所提出的研究试图预测电池系统中由于热效应的存在而导致的容量衰减。 细胞内的梯度。一个合作的方法是计划为拟议的研究结合， 申请人和支持组织的互补专业知识和技能。建议的结果 研究将有助于支持组织的努力，以说明其热的重要性， 管理系统，并为他们的下一代系统的设计和开发。

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.