The battery core is an important part of storing and releasing electrical energy, and is mainly composed of positive electrode, negative electrode and electrolyte. Its features and application scenarios are as follows: High energy density: The battery core has high energy storage capacity, small size and high energy density. It is suitable for use in mobile devices and wireless sensors, such as mobile phones, tablets, Bluetooth headsets, etc. Long life: The battery core has a long service life, can undergo multiple charge and discharge cycles, and has good stability. Common lithium-ion battery cells can be charged and discharged hundreds to thousands of times, and are suitable for use in electric vehicles, drones, laptops and other scenarios. Fast charging: Some batteries have fast charging characteristics and can restore high power in a short time. Fast-charging batteries are suitable for use in electric vehicles, power banks and other scenarios, and can improve users’ charging efficiency. Lightweight and flexible: Because the battery core is small and lightweight, it can be designed and assembled according to the needs of different devices, and is suitable for various smaller-sized electronic products. Environmentally friendly and efficient: The battery core has high energy conversion efficiency and low self-discharge rate, which can effectively reduce energy waste and environmental pollution. At the same time, battery cells can also be recycled and reused to reduce resource consumption. In summary, the characteristics and application scenarios of battery cells make them an important energy storage device in mobile electronic devices, electric vehicles, energy storage systems and other fields.