Power Battery & Battery PACK: Core Knowledge

This document provides a comprehensive overview of power batteries and battery packs, focusing on lithium-ion technology. It begins with essential battery terminology, including voltage types such as open circuit voltage, working voltage, discharge cut-off voltage, and limited charge voltage, with comparative data for lead-acid, nickel-cadmium, nickel-metal hydride, and lithium batteries. Battery capacity is explained in terms of theoretical, rated, and actual capacity, along with the formula C=It. Internal resistance is discussed, covering ohmic and polarization resistance and its impact on performance. Other key concepts include load capacity, internal pressure, charge rate (C-rate), over-discharge, overcharge, state of charge (SOC), depth of discharge (DOD), and self-discharge rate. The document serves as a foundational guide for understanding power battery characteristics and battery pack design, essential for professionals in the new energy industry.