What role do current collectors play in a battery?

Release time:

2026-01-16

The current collector is the battery’s “highway for electric current,” primarily responsible for three core functions: conducting electricity, providing sealing, and ensuring mechanical fixation. Specifically:

1. Conductivity: The “main thoroughfare” for current transmission
Positive and negative terminal connection: The positive and negative terminals inside the battery are led out via metal strips, forming a charge-discharge circuit.
Material Selection:
Aluminum: Used for the positive electrode, it’s lightweight and resistant to oxidation.
Nickel/Copper-Nickel Plating: Used for the negative electrode, offering excellent corrosion resistance and good solderability.
Technical optimization: The mid-position tab design reduces internal resistance by 30%, and during 6C fast charging, Joule heating is reduced by 60%.
II. Sealing: The “safety plug” that prevents leakage
Film function: It is thermally bonded to the aluminum-plastic film by heating (around 140℃) to prevent the metal strip from short-circuiting with the casing.
Film types: black film, white film, and single-layer film. Among these, the black film has a three-layer structure (melanin + PE + PP).
III. Fixed: The “Safety Lock” for Battery Chips
Chip fixation: Prevents the battery chip from shifting or falling off, thereby avoiding short circuits.
Safety Design: A well-designed terminal structure can prevent direct contact between the positive and negative electrodes.
IV. Technological Innovation: The Evolution of Tab Design
Multi-terrier design: Shortens the electron transport distance and supports 10C ultra-fast charging.
Zero-ear design: Adopted in Tesla’s 4680 battery, it boosts range by 54% and reduces costs by 56%.