It has been established that polymer dielectrics are essential components of high-energy-density film capacitors. Commercial dielectric film does not have the strong thermal stability required for the severe operating environment. A prospective choice for high-temperature energy storage dielectric materials, polyimide (PI) is regarded as such due to its superior thermal stability and insulating qualities.

With regard to polymer multiple structures, such as short-range, distant, and higher-order structures, this review elaborates on design strategies to enhance the energy storage capabilities of polyimide dielectric materials. The running costs of a microgrid can be greatly decreased by adding battery energy storage (BES) and employing effective charge and discharge management for the batteries. However, energy storage expenses are added to the microgrid costs, therefore it is important to choose an energy storage size that minimises both energy storage and total operating costs. By taking into account the process of battery capacity deterioration, this research introduces a new technique for determining the ideal size of the battery energy storage. This approach involves modelling battery deterioration functions first, then incorporating those models into the problem of identifying the ideal battery size.