Cylindrical Lithium Battery Cells

Cylindrical Lithium Battery Cells: An Overview of 21700, 32700, and 38121 Models

7/11/20233 min read

a group of batteries and cells a group of batteries and cells

Introduction: Lithium-ion batteries have revolutionized the world of portable electronics and electric vehicles due to their high energy density, long cycle life, and ability to deliver sustained power. Among various lithium battery configurations, cylindrical cells have gained significant popularity due to their compatibility with a wide range of applications. This article provides an in-depth analysis of three widely used cylindrical lithium battery cells: 21700, 32700, and 38121.

21700 Cylindrical Lithium Battery Cell: The 21700 cylindrical lithium battery cell is a relatively new addition to the market, gaining prominence due to its improved energy storage capacity compared to the previously popular 18650 cells. The “21” in the model number denotes the 21mm diameter, while “700” signifies the 70mm length of the battery cell. The larger form factor of the 21700 cell allows for higher energy density and greater performance.

Advantages of 21700 Cylindrical Lithium Battery Cell:

Higher energy density: The increased size of the 21700 cell enables it to store more energy, making it an ideal choice for high-performance applications.

Improved thermal management: The larger surface area of the 21700 cell enhances heat dissipation, reducing the risk of overheating during operation.

Longer cycle life: The 21700 cell exhibits improved cycle life compared to smaller cylindrical cells, making it suitable for applications that require prolonged use.

Applications of 21700 Cylindrical Lithium Battery Cell:

Electric vehicles (EVs): The high energy density and extended cycle life of the 21700 cell make it an excellent option for EVs, enabling longer driving ranges and improved overall performance.

Energy storage systems (ESS): The 21700 cell’s enhanced energy storage capacity makes it well-suited for large-scale ESS applications, such as grid stabilization and renewable energy storage.

Portable electronics: The improved energy density and thermal management of the 21700 cell provide longer battery life and improved performance for smartphones, laptops, and other portable devices.

32700 Cylindrical Lithium Battery Cell: The 32700 cylindrical lithium battery cell, also known as the 32650 cell, is larger in size compared to the 21700 cell. The “32” in the model number denotes the 32mm diameter, while “700” signifies the 70mm length of the battery cell. The larger form factor of the 32700 cell allows for even greater energy density and improved performance.

Advantages of 32700 Cylindrical Lithium Battery Cell:

Enhanced energy density: The larger form factor of the 32700 cell enables it to store more energy, making it an ideal choice for applications that require higher power output.

Improved thermal stability: The increased surface area of the 32700 cell facilitates better heat dissipation, reducing the risk of thermal runaway during operation.

Extended cycle life: The 32700 cell exhibits a longer cycle life compared to smaller cylindrical cells, making it suitable for applications that require frequent charging and discharging.

Applications of 32700 Cylindrical Lithium Battery Cell:

Electric vehicles (EVs): The higher energy density and extended cycle life of the 32700 cell make it ideal for use in electric vehicles, enabling increased driving ranges and improved overall performance.

Energy storage systems (ESS): The 32700 cell’s enhanced energy storage capacity makes it suitable for large-scale ESS applications, such as peak shaving and load leveling.

Power tools: The improved energy density and thermal stability of the 32700 cell provide longer runtime and improved performance for power tools, such as cordless drills and electric saws.

38121 Cylindrical Lithium Battery Cell: The 38121 cylindrical lithium battery cell is the largest among the three models discussed in this article. The “38” in the model number denotes the 38mm diameter, while “121” signifies the 121mm length of the battery cell. The larger form factor of the 38121 cell allows for the highest energy density and superior performance.

Advantages of 38121 Cylindrical Lithium Battery Cell:

Maximum energy density: The 38121 cell offers the highest energy density among cylindrical lithium battery cells, making it ideal for applications that require maximum power output.

Enhanced thermal management: The larger surface area of the 38121 cell allows for superior heat dissipation, minimizing the risk of thermal issues during operation.

Extended cycle life: The 38121 cell exhibits an exceptionally long cycle life, making it suitable for applications that require frequent charging and discharging over an extended period.

Applications of 38121 Cylindrical Lithium Battery Cell:

Electric vehicles (EVs): The maximum energy density and extended cycle life of the 38121 cell make it a preferred choice for high-performance electric vehicles, enabling superior acceleration and extended driving ranges.

Industrial energy storage: The high energy density and extended cycle life of the 38121 cell are well-suited for industrial applications that require large-scale energy storage, such as UPS systems and remote power stations.

Aerospace and defense: The 38121 cell’s superior energy density and thermal management make it an ideal choice for aerospace and defense applications that require lightweight yet powerful energy storage solutions.

Conclusion: Cylindrical lithium battery cells, such as the 21700, 32700, and 38121 models, have revolutionized various industries by offering high energy density, extended cycle life, and improved thermal management.