21700 batteries are a type of lithium-ion battery characterized by their cylindrical shape, with a diameter of 21 mm and a length of 70 mm. They are designed to provide higher capacity and improved performance compared to their predecessor, the 18650 battery. Commonly used in electric vehicles, power tools, and various high-drain applications, 21700 batteries have become increasingly popular due to their enhanced energy density and thermal performance.
Key Features of 21700 Batteries
1. Dimensions and Capacity
- Size: 21 mm in diameter and 70 mm in length.
- Capacity: Typically ranges from 3000 mAh to 5000 mAh, with some models offering even higher capacities. This increased capacity allows for longer runtimes in devices that require substantial power.
2. Voltage
- The nominal voltage for most 21700 batteries is around 3.6V to 3.7V, making them suitable for a variety of applications that require stable voltage output.
3. Energy Density
- 21700 batteries offer approximately 20% higher energy density compared to 18650 batteries, which translates to more power stored in the same amount of space.
4. Thermal Performance
- The larger size of the 21700 battery allows for better heat dissipation during high-power operations, reducing the risk of overheating and enhancing overall safety.
5. Discharge Rate
- Many 21700 batteries can handle high discharge rates, making them ideal for applications that require bursts of power, such as electric vehicles and power tools.
Advantages of 21700 Batteries
1. Higher Capacity
The increased capacity of 21700 batteries means they can deliver more energy over longer periods, making them more efficient for high-drain applications.
2. Improved Thermal Management
Their design allows for better heat distribution, which enhances performance and safety during operation.
3. Fast Charging Compatibility
Due to their thermal characteristics, 21700 batteries can support fast charging technologies without compromising safety or longevity.
4. Versatility
These batteries are used in a wide range of applications, from consumer electronics to electric vehicles, due to their robust performance characteristics.
Comparing 21700 with Other Battery Types
| Feature | 18650 Battery | 21700 Battery |
|---|---|---|
| Diameter | 18 mm | 21 mm |
| Length | 65 mm | 70 mm |
| Capacity | 2200 – 3600 mAh | 3000 – 5000 mAh |
| Nominal Voltage | ~3.6V | ~3.6V – 3.7V |
| Energy Density | Lower than 21700 | Higher than 18650 |
| Typical Applications | Laptops, flashlights | Electric vehicles, power tools |
Latest News
- The adoption of 21700 batteries is increasing in the electric vehicle market as manufacturers seek higher efficiency and longer range.
- Recent advancements in battery technology have led to improved manufacturing processes for 21700 cells, making them more accessible and cost-effective.
- Research continues into enhancing the energy density and cycle life of lithium-ion batteries, with a focus on improving the performance of the 21700 format.
Redway Expert Comment
In our extensive experience at Redway Battery, the transition from traditional battery formats like the 18650 to the more advanced 21700 is a significant step forward in battery technology. With their superior capacity and thermal management capabilities, 21700 batteries are setting new standards for performance across various applications. As we continue to innovate in this space, we remain committed to providing high-quality lithium-ion solutions tailored to meet evolving industry demands.”
