Lithium battery separator
Lithium battery separator
Lithium battery separator
Industry background and current situation

The lithium battery separator material is mainly composed of polyolefin separators, which have excellent mechanical properties, chemical stability, and cost-effectiveness. In addition to polyethylene and polypropylene, there are also polypropylene+ceramic coatings, polyethylene+ceramic coatings, as well as double-layer and three-layer materials based on polypropylene and polyethylene.


The requirements for diaphragm performance in downstream markets have gradually increased, and wet processes can better control the pore size, distribution, and porosity of diaphragms, so they are generally used to manufacture high-end thin films. However, domestic diaphragms started relatively late, and the technological maturity of domestic enterprises is not high. Many enterprises are also generally limited by technology and production equipment in the wet process.


Sonner provides a standard loss-in-weight feeding mixing station for wet diaphragm process raw materials and additives. The mixing station includes particle material transportation, online weight loss continuous measurement of powdered and liquid raw material formulas, and synchronous mixing composition, making it an ideal and mature solution for extrusion film processing.

Dosing solution

工艺方案

Dosing difficulties:

1. Two types of resins need to be transported, and material replacement and cleaning are required during the metering process.
2. The amount of additives added is small, requiring high-precision dosing and weighing.
3. The raw material contains liquid and needs to be heated for measurement.
Ingredients
Typical raw material composition
Resin: powder, bulk density 0.5-0.6Kg/L; Average liquidity
Resin: powder, bulk density 0.5-0.6Kg/L; Average liquidity
Additive: mixture, bulk density 0.4-0.5Kg/L; Average liquidity
White oil: liquid, bulk density 0.9-1.0Kg/L
All powdered raw materials in the recipe enter the loss-in-weight dosing station through the FC.
The principle of small batch continuous mixing, highly reducing the initial proportion of the recipe.
The auxiliary agent is optimized into an independent small batch premixed, resulting in a higher quality ratio.
Technics
Characteristics
Lithium battery separator
Lithium battery separator
Common equipment composition

FC conveyor system

Refilling silo

Refilling valve

S/T/LWM continuous loss-in-weight dosing system

Aggregate silo

Film extruder

Common equipment
Make up

Advantages of Sonner feeder

Multi-program
Multi-program
We support continuous/batch weighing, compatible with granular, powder, and liquid raw materials. Design a plan based on the customer's on-site situation.
01
More accuracy
More accuracy
The dynamic weighing module is equipped with a 24 bit 1:400000 resolution chip and a 32-bit CPU. Even with small feeding amounts, we can ensure stable feeding accuracy.
02
Dual closed-loop
Dual closed-loop
Flow and speed dual closed loop, flow (g/s) control adjustment frequency 500ms, solving the problem of accuracy in speed execution.
03
Anti-bridge
Anti-bridge
Excellent anti bridging performance, facing difficult to feed mineral powder, our flow control is more precise.
04
Easy control
Easy control
The entire system adopts a modular design, which is easy and quick to disassemble without tools, making it easy to clean and replace raw materials.
05