Green Energy Experts Solution Private Limited

A 21700 cell holder is a component designed to securely hold and connect 21700 lithium-ion battery cells—a cylindrical battery size measuring 21 mm in diameter and 70 mm in length. These holders are used in battery packs for electric vehicles, DIY projects, power tools, and energy storage systems.

• Size: 21 mm diameter × 70 mm length

• Voltage: Typically 3.6V to 3.7V nominal

• Capacity: Ranges from ~4000mAh to 5000mAh+

• Commonly used in:

  • Tesla vehicles

  • High-power flashlights

  • E-bikes and scooters

  • Power banks and solar storage

1. Safe Physical Mounting:

   • Holds the cylindrical cells in place in a secure and organized manner.

   • Prevents short circuits caused by contact between cells.

2. Electrical Connectivity:

   • Facilitates series or parallel connections.

   • Some holders come with nickel strips or spring contacts for electrical linking.

3. Cooling and Ventilation:

   • Often designed with air gaps or grid structures to improve airflow and heat dissipation.

4. Modular Assembly:

   • Easily snap together to form custom battery packs (3S, 4P, etc.)

• Material: Usually made from ABS plastic or nylon, which are non-conductive and heat-resistant.

• Nickel Strips / Busbars: Used for welding the cells in series/parallel configurations.

• Cell Spacers: Keep cells apart to reduce heat and provide airflow (especially for high-current builds).