Electrical # current. # collector

A current collector is a conductive component, typically made of metal like copper or aluminum, that bridges the flow of electrons between the active material (like electrodes in a battery) and the external circuit. In essence, it's a path for electricity to flow within a device like a battery or a vehicle's power system. 

Here's a more detailed breakdown:

In Batteries:

Function: Current collectors facilitate the movement of electrons between the battery's electrodes and the external circuit. They also provide a physical support for the electrode materials. 

Materials: Common materials include copper foil (for negative electrodes) and aluminum foil (for positive electrodes). 

Types: They can be thin foils, meshes, or even porous materials. 

In Transportation (Trolleybuses, Trams, etc.):

Function:

These collectors, often called "pick-ups," transfer electricity from overhead lines or third rails to the vehicle's electrical system. 

Mechanism:

They make contact with the power source and are typically mounted on the vehicle's roof, side, or base. 

Types:

Can include sliding contacts, spring-loaded designs, or even pneumatic systems. 

Key Properties:

Conductivity: Essential for efficiently conducting electricity.

Durability: Must withstand mechanical stresses and electrochemical reactions.

Corrosion Resistance: Important for longevity, especially in harsh environments.

Specific Surface Area: Important for porous current collectors, as it affects electrolyte infiltration and adhesion