65mm width insulation fish paper with glue attached is a special insulating material used in lithium battery pack assembly for batteries such as:
*18650
*26650
*32650
It helps prevent short circuits and protects battery cells during spot welding and battery pack construction.
Product Type:Battery insulation fish paper
Width:65 mm
Thickness:0.15 mm – 0.3 mm
Material:Fish paper / Barley paper / Vulcanized fiber
Adhesive:Self-adhesive glue backing
Color:Green
Temperature Resistance:Up to about 120°C
Insulation Class:Class E
Application:Lithium-ion battery pack insulation
Compatible Batteries:18650, 26650, 32650,21700
Features:
Strong electrical insulation
Easy peel-and-stick (adhesive type)
Acid and alkali resistance
Anti-interference shielding
Flexible but durable
Helps improve battery pack safety
Why Fish Paper Is Important
Applications
Wrapping lithium battery packs
Insulating nickel strips
Separating battery layers
Protecting BMS boards
Adding insulation between cells
In lithium battery packs, the metal can body is usually the negative terminal. Fish paper helps avoid accidental contact between:
Nickel strips
BMS components
Wires
Battery casing
This greatly reduces the risk of short circuits and overheating. Reddit battery builders also commonly recommend fish paper together with insulating rings for safer battery pack assembly.