Battery packs are integrated assemblies of multiple electrochemical cells connected in series, parallel, or combination configurations to deliver required voltage, capacity, and power. These modular energy storage systems play critical roles in portable electronics, electric vehicles (EVs), renewable energy storage, and industrial equipment. Modern advancements in battery chemistry and management systems have enabled higher energy densities, faster charging capabilities, and improved safety features essential for expanding electrification across industries.
| Type | Functional Characteristics | Application Examples |
|---|---|---|
| Lithium-ion (Li-ion) | High energy density (150-250 Wh/kg), 500-2000 cycles lifespan, low self-discharge | Smartphones, EVs, laptops |
| Nickel-Metal Hydride (NiMH) | Moderate energy density (60-120 Wh/kg), 500-1000 cycles, environmental friendly | Hybrid vehicles, digital cameras |
| Lead-Acid | Low cost, high surge currents, 300-500 cycles | Automotive starters, backup power |
| Solid-State | High safety, >1000 Wh/L energy density, wide temperature range | Next-gen EVs, aerospace |
| Lithium Polymer (LiPo) | Flexible form factors, 300-500 cycles, lighter weight | Drones, wearable devices |
Typical battery pack architecture includes:
| Parameter | Significance |
|---|---|
| Energy Density (Wh/kg) | Determines runtime/weight ratio for portable devices |
| Charge Cycle Life | Defines longevity under repeated charge/discharge |
| Voltage Range (V) | Dictates device power requirements |
| Charge Rate (C-rate) | Impacts charging time and thermal performance |
| Operating Temperature (-20 C to 60 C) | Determines environmental suitability |
| Manufacturer | Product | Key Technology |
|---|---|---|
| Panasonic | NCR21700B (21700 Li-ion) | SiO-C anode, 3.6V, 5100mAh |
| Samsung SDI | ICR18650-30Q | NMC chemistry, 3000mAh |
| Contemporary Amperex (CATL) | NCM811 pouch cells | Energy density >240Wh/kg |
| LG Chem | LG18650HG2 | 3000mAh, 800 cycles |
| Tesla | 4680 tabless battery | 29400mAh, 92kWh pack capacity |
Key development directions include: