The diaphragm material of lithium battery is mainly polyolefin diaphragm, which has excellent mechanical properties, chemical stability and cost performance. In addition to polyethylene and polypropylene, there are polypropylene + ceramic coating, polyethylene + ceramic coating, and double and triple layer materials based on polypropylene and polyethylene.

The downstream market for diaphragm performance requirements have gradually increased, wet process can better control the diaphragm aperture size, distribution and porosity, so generally used to manufacture high-end films. The domestic diaphragm started late, the technical maturity of domestic enterprises is not high, many enterprises in the wet process is also generally subject to technology and production equipment.

Difficulty of measurement

1. The two resins need to be transported, and the metering process needs to be refueled and cleaned

2. The amount of additives is small, requiring high precision measurement and weighing

3. The raw material composition is liquid, which needs to be heated and measured

Songnai provides a standard weightless feeding and mixing station for raw materials and additives in wet diaphragm process. The mixing station includes powder/particle material transportation, continuous online weightless measurement of powder and liquid raw material formula, and synchronous mixing composition. It is an ideal and mature solution for extruded film processing.