Influence of position and intensity of production-caused inhomogeneities on the spatially-resolved performance parameters and total performance of lithium-ion cells

生产引起的不均匀性的位置和强度对锂离子电池空间分辨性能参数和总体性能的影响

• 批准号: 461805740
• 负责人: Professorin Dr.-Ing. Julia Kowal
• 金额: --
• 依托单位: Fachgebiet Elektrische Energiespeichertechnik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/461805740?language=en
• 关键词: Influence; position; intensity; production; caused

One way to reduce the cost of lithium-ion batteries (LIB) is to increase the throughput of the production through innovative handling processes. The unavoidable interaction between assemblies and electrodes creates uneven current density distributions in the electrodes and thus influences the performance of the LIB. In addition to defects that have already been investigated, little is known about the effects of production-related loads when handling the electrodes. Especially when designing innovative production lines, it is therefore important to clarify what influence various intensities and positions of inhomogeneities have on the performance of the LIB.The aim of this project is to investigate the (positional) influence of inhomogeneities (defects and loads) on electrodes on the LIB performance. It can be split up into two aims. The first aim is to identify the influence of inhomogeneities on LIB performance with the help of an experimentally supported equivalent circuit model (ESBM) in order to compare the influences of the inhomogeneities for the first time. The second aim is to also determine the influence of the position. For this purpose, an ESBM for spatially resolved characterization (oESBM) is developed and parameterized with the help of an innovative test cell for spatially resolved characterization. For both aims, the defects particle contamination, moisture and pinholes and the mechanical loads compression, tension and bending are examined. The aging mechanisms SEI growth and lithium plating are then forced through calendar and cyclical aging with test cells. The performance analysis focuses on Coulomb's efficiency, impedance and capacitance. The results of both aims are finally linked into an application software to enable an ageing prediction. This enables the evaluation of handling processes in production even before they are implemented.

降低锂离子电池（LIB）成本的一种方法是通过创新的处理工艺提高生产吞吐量。组件和电极之间不可避免的相互作用在电极中产生不均匀的电流密度分布，从而影响LIB的性能。除了已经研究过的缺陷外，对处理电极时与生产相关的负载的影响知之甚少。因此，特别是在设计创新生产线时，澄清不均匀性的各种强度和位置对LIB性能的影响非常重要。本项目的目的是调查不均匀性（缺陷和负载）的（位置）影响电极上的LIB性能。它可以分为两个目标。第一个目的是确定的不均匀性对锂离子电池性能的影响与实验支持的等效电路模型（ESBM）的帮助下，为了比较的不均匀性的影响的第一次。第二个目的也是确定位置的影响。为此，开发了用于空间分辨表征的ESBM（oESBM），并在用于空间分辨表征的创新测试单元的帮助下进行参数化。对于这两个目标，缺陷颗粒污染，水分和针孔和机械载荷压缩，拉伸和弯曲进行了检查。老化机制SEI生长和锂电镀，然后被迫通过日历和循环老化与测试电池。性能分析的重点是库仑效率，阻抗和电容。这两个目标的结果最终都被连接到一个应用软件中，以便进行老化预测。这使得即使在实施之前也可以对生产中的处理过程进行评估。