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Wet void consistency and uniformity, porosity control through bi-directional stretching, dry method can only be stretched in one direction, part of the electrons can not pass through, affecting the battery cycle performance.
Wet bi-directional stretching to enhance the strength of the diaphragm, puncture strength is stronger than the dry method.
The thickness of wet diaphragm can be made thinner and thinner to adapt to the future trend. Wet method is easier for battery cell production, and the rolled needle is easy to pull out.
Wet diaphragm production process mainly includes raw material preparation, melt mixing, phase separation, cooling curing, stretching and finished product processing steps. The raw material preparation stage requires the selection of suitable low and high molecular weight substances, such as liquid hydrocarbons, paraffins and polyolefin resins. The melt-mixing stage mixes these two substances and heats them to melt them to form a homogeneous liquid mixture. In the phase separation stage, the mixture undergoes phase separation by cooling to form a microporous structure. The cooling and curing stage cools and cures the separated phases to form a preliminary membrane material. The stretching stage further optimises the structure and properties of the membrane through the stretching process. Finally, the finished product processing stage cuts and cleans the membrane to obtain the final wet diaphragm product.
Specific steps and details of the wet diaphragm production process
Raw material preparation: Select low molecular weight substances (e.g. liquid hydrocarbons, paraffin) and high molecular weight substances (e.g. polyolefin resins) to ensure their mutual incompatibility.
Melt Mixing: Mixing and heating the low and high molecular weight substances to form a homogeneous liquid mixture.
Phase Separation: The mixture undergoes phase separation by cooling to form a microporous structure.
Cooling and curing: The phase separated substances are cooled and cured to form a preliminary membrane material.
Stretching: Further optimisation of the membrane structure and properties by means of bi-directional synchronous stretching or bi-directional asynchronous stretching processes.
Finished product processing: The membrane is cut and cleaned to obtain the final wet diaphragm product.
Characteristics of the wet diaphragm production process
The wet diaphragm production process has the following characteristics:
Complex three-dimensional structure: The three-dimensional structure of wet diaphragm is more complex than that of dry diaphragm, with higher degree of microporous flexure.
Poor thermal stability: Due to the use of solvents in the production process, the thermal stability of wet diaphragm is relatively poor.
Complex process: The production process for wet diaphragms is relatively complex, involving multiple steps and detailing.
Nanjing Suminoe Precision Machinery Co., Ltd. has professional cast film production line, the company's main cast film manufacturing production line: TPU hot melt adhesive film production line, CPP/CPE cast film production line, EVA solar energy encapsulation adhesive film production line, PE sanitary breathable film production line, PVDF cast film production line, PP 3D film production line, medical blood purification film production line, multilayer co-extruded barrier film production line, LLDPE winding film production line production line, LLDPE winding film production line and so on.
Wet bi-directional stretching to enhance the strength of the diaphragm, puncture strength is stronger than the dry method.
The thickness of wet diaphragm can be made thinner and thinner to adapt to the future trend. Wet method is easier for battery cell production, and the rolled needle is easy to pull out.
Wet diaphragm production process mainly includes raw material preparation, melt mixing, phase separation, cooling curing, stretching and finished product processing steps. The raw material preparation stage requires the selection of suitable low and high molecular weight substances, such as liquid hydrocarbons, paraffins and polyolefin resins. The melt-mixing stage mixes these two substances and heats them to melt them to form a homogeneous liquid mixture. In the phase separation stage, the mixture undergoes phase separation by cooling to form a microporous structure. The cooling and curing stage cools and cures the separated phases to form a preliminary membrane material. The stretching stage further optimises the structure and properties of the membrane through the stretching process. Finally, the finished product processing stage cuts and cleans the membrane to obtain the final wet diaphragm product.
Specific steps and details of the wet diaphragm production process
Raw material preparation: Select low molecular weight substances (e.g. liquid hydrocarbons, paraffin) and high molecular weight substances (e.g. polyolefin resins) to ensure their mutual incompatibility.
Melt Mixing: Mixing and heating the low and high molecular weight substances to form a homogeneous liquid mixture.
Phase Separation: The mixture undergoes phase separation by cooling to form a microporous structure.
Cooling and curing: The phase separated substances are cooled and cured to form a preliminary membrane material.
Stretching: Further optimisation of the membrane structure and properties by means of bi-directional synchronous stretching or bi-directional asynchronous stretching processes.
Finished product processing: The membrane is cut and cleaned to obtain the final wet diaphragm product.
Characteristics of the wet diaphragm production process
The wet diaphragm production process has the following characteristics:
Complex three-dimensional structure: The three-dimensional structure of wet diaphragm is more complex than that of dry diaphragm, with higher degree of microporous flexure.
Poor thermal stability: Due to the use of solvents in the production process, the thermal stability of wet diaphragm is relatively poor.
Complex process: The production process for wet diaphragms is relatively complex, involving multiple steps and detailing.
Nanjing Suminoe Precision Machinery Co., Ltd. has professional cast film production line, the company's main cast film manufacturing production line: TPU hot melt adhesive film production line, CPP/CPE cast film production line, EVA solar energy encapsulation adhesive film production line, PE sanitary breathable film production line, PVDF cast film production line, PP 3D film production line, medical blood purification film production line, multilayer co-extruded barrier film production line, LLDPE winding film production line production line, LLDPE winding film production line and so on.