Battery pressing sheet

A battery pressing sheet is a critical component within modern battery cells, particularly in prismatic and pouch-type lithium-ion designs. It is a multi-layered assembly that serves several essential functions to ensure the battery's performance, safety, and longevity.

Its primary role is to apply and maintain a uniform and optimal amount of compressive pressure on the electrode stack (the anode, separator, and cathode). This consistent pressure is crucial for maintaining intimate contact between these layers, which minimizes electrical resistance and facilitates efficient ion transport during charging and discharging cycles. This directly contributes to the battery's power output and energy efficiency.

Furthermore, the pressing sheet acts as a buffer against mechanical stress and physical deformation. It helps absorb expansion and contraction of the electrodes that naturally occurs during cycling, preventing delamination and preserving the structural integrity of the cell over time. This is vital for maximizing the cycle life of the battery.

Many pressing sheets also incorporate integrated thermal management features. They may be designed with channels or made from materials that help distribute heat evenly across the cell surface, preventing hot spots that can lead to degradation or safety hazards.

Typically, the sheet is a composite material, often combining layers of foam, plastic, metal, or adhesive. Each layer is chosen for specific properties such as compressibility, thermal conductivity, electrical insulation, and resistance to the harsh chemical environment inside the battery.

In summary, the battery pressing sheet is far more than a simple spacer. It is a sophisticated, functional component that ensures stable electrical contact, provides mechanical support, manages thermal behavior, and ultimately plays a key role in the reliability and safety of the entire battery system.