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21700 lithium battery, 3.7V, capacity 5000mAh, round appearance, flashlight, handheld electric wrench, electric angle grinder, power battery for electric tools
Product Details:
| Place of Origin: | CHINA |
| Brand Name: | JZFY |
| Certification: | KC.CE.FCC.ROHS.MSDS.UN38.3 |
| Model Number: | 21700 |
Payment & Shipping Terms:
| Minimum Order Quantity: | 1000 |
|---|---|
| Price: | Please contact me |
| Packaging Details: | paper box |
| Delivery Time: | 15day |
| Payment Terms: | L/C, D/A, D/P, T/T, Western Union, MoneyGram |
| Supply Ability: | 100000pcs |
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Detail Information |
Product Description
Advantages of 21700 Lithium-Ion Batteries
The 21700 lithium-ion battery, named for its 21mm diameter and 70mm length, has emerged as a game-changer in energy storage technology, outperforming traditional models like the 18650 in multiple critical aspects. Its advantages make it a preferred choice for electric vehicles (EVs), portable electronics, and large-scale energy storage systems, as detailed below:
1. Higher Energy Density
One of the most significant strengths of the 21700 battery is its superior energy density. Typically ranging from 250-300 Wh/kg (watt-hours per kilogram), it delivers 15-20% more energy per unit mass than the 18650 battery (which averages 200-250 Wh/kg). This translates to larger single-cell capacities—usually 4000-5000 mAh (milliampere-hours)—allowing devices to store more energy without increasing overall size. For EVs, this directly boosts battery pack capacity, laying the groundwork for longer driving ranges.
2. Enhanced Driving Range for Electric Vehicles
For the automotive industry, the 21700 battery’s high energy density translates to tangible improvements in EV 续航 (driving range). When integrated into battery packs, it reduces the number of cells needed to achieve a target range—for example, a mid-size EV using 21700 cells may require 10-15% fewer cells than one using 18650 cells. This not only cuts down on pack complexity but also enables automakers to design EVs with either longer ranges (e.g., exceeding 500 km on a single charge) or more compact battery packs, freeing up space for passenger comfort or cargo.
3. Improved Safety Performance
Safety is a top priority in battery design, and the 21700 battery excels here through structural and material optimizations. Its thicker stainless-steel casing (compared to 18650) provides better resistance to physical impacts, such as punctures or 挤压 (crushing), which are common triggers for thermal runaway. Additionally, advanced electrode coatings and electrolyte formulations in modern 21700 cells reduce the risk of short circuits and overheating. Tests show that 21700 batteries have a 20-30% lower probability of thermal runaway than smaller cylindrical batteries under extreme conditions.
4. Superior Thermal Management
The 21700 battery’s larger size contributes to better heat dissipation—a critical factor for high-power applications like EVs or power tools. Its increased surface area-to-volume ratio allows heat to escape more efficiently, preventing localized hotspots that can degrade battery performance or cause safety hazards. In high-discharge scenarios (e.g., rapid acceleration in EVs), 21700 cells maintain more stable temperatures, extending their cycle life and ensuring consistent power output. This also reduces the burden on battery cooling systems, lowering energy consumption for thermal management in devices.
5. Cost-Efficiency in Large-Scale Applications
While the 21700 battery’s single-cell cost is slightly higher than the 18650’s, its energy density 优势 (advantage) drives lower system-level costs for large-scale projects. For energy storage systems or EV battery packs, fewer 21700 cells are needed to meet capacity requirements, reducing costs associated with cell assembly, wiring, and packaging. Industry data shows that 21700-based battery packs can lower total system costs by 8-12% compared to 18650-based packs. Additionally, as production scales (e.g., Tesla’s Gigafactories), economies of scale further bring down 21700 battery costs.
6. Strong Compatibility and Scalability
The 21700 battery follows a standardized cylindrical form factor, making it compatible with existing manufacturing lines and device designs with minimal modifications. For manufacturers transitioning from 18650 to 21700, adjustments to cell holders or pack enclosures are often straightforward, avoiding costly overhauls of production equipment. Moreover, its modular design supports flexible scalability: 21700 cells can be easily connected in series (for higher voltage) or parallel (for higher capacity) to meet diverse needs—from small devices like portable speakers to large-scale grid storage systems.
7. Longer Cycle Life
Thanks to improved electrode materials and better thermal control, 21700 batteries typically offer longer cycle lives than smaller cylindrical batteries. Most 21700 cells retain 80% of their original capacity after 1000-1200 charge-discharge cycles, compared to 800-1000 cycles for 18650 cells. This longevity reduces replacement frequency, lowering lifecycle costs for users—especially critical for applications like EVs (where battery replacement is expensive) and stationary energy storage (which requires decades of reliable operation).
In summary, the 21700 lithium-ion battery combines higher energy density, enhanced safety, and cost-efficiency, making it a pivotal technology for the transition to clean energy and advanced portable electronics.
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