Battery Separators Of Different Process

Dry Process Battery Separator

- Thickness: Mainly 12μm, 16μm, 20μm (thick type, difficult to produce ultra-thin products <10μm);

- Width: 100–1600mm (customizable);

- Porosity: 60%–70%.

- Simple production process, short cycle time and high yield rate;

- No solvent residue, good environmental performance;

- Low raw material and processing costs, outstanding cost performance.

Wet Process Battery Separator

- Thickness: Mainly 4μm, 6μm, 8μm, 12μm (thin/ultra-thin type);

- Width: 200–2000mm (customizable);

- Porosity: 70%–80%.

- Uniform pores, excellent air permeability and electrolyte wettability;

- Balanced mechanical properties, strong puncture and tensile resistance;

- Capable of producing ultra-thin products (4–8μm), suitable for high energy density batteries;

- Strong coating adaptability (ceramic/PVDF/aramid), high safety performance.

Dry Process Battery Separator

The raw materials feature good fluidity and low molecular weight, with a thermal shutdown temperature of 135°C (thermal shrinkage ≤5%) when heated. Safety performance is relatively limited, making it less ideal for high-power, high-capacity batteries. The three-layer film offers an advantage: its thermal shutdown temperature is 135°C, while thermal stability temperature reaches 160°C, creating a 25°C safety margin and effectively suppressing thermal inertia for improved safety.

Made from polyolefin materials, it adopts a solvent-free physical stretching (uniaxial/biaxial stretching) process to form slit-shaped pores. With a simple process and low cost, it serves as the basic separator for low-to-mid-end lithium batteries and energy storage systems.

Wet Process Battery Separator

The wet process uses high molecular weight, controlled-rheology polyolefin raw materials. The base film thermal shutdown temperature is around 130–135°C; with ceramic/inorganic coating, thermal stability can be enhanced to 180–200°C, ensuring reliable safety for high-power batteries. The wet process is commonly produced as single-layer film, which can be further upgraded via ceramic/PVDF coating.

Adopting the Thermally Induced Phase Separation (TIPS) + solvent extraction process, it uses polyolefin as the base material to form uniform circular pores. It can be ultra-thin with comprehensive performance, serving as the mainstream separator for power batteries and high-end lithium batteries.

Dry Process Battery Separator

- Energy storage batteries (residential/large-scale energy storage power stations);

- Low-to-mid-end consumer lithium batteries (ordinary power banks, low-end digital products);

- Low-speed electric vehicles, electric bicycles, basic power tools.

Wet Process Battery Separator

- Power batteries (new energy vehicles, high-end low-speed vehicles);

- High-end energy storage (industrial and commercial energy storage, large-scale power stations);

- High-end consumer lithium batteries (drones, flagship mobile phones, high-end power tools).