Lithium Battery 3.7V Lithium Polymer Battery 3.2V LifePo4 Battery 1.2V Ni-MH Battery Button Coin Battery
3.7V Battery Pack 7.4V Battery Pack 11.1V Battery Pack 14.8V Battery Pack Other Battery Pack
Sino Science&Technology Battery Co.,ltd is a high-tech production enterprise which specialize in the R&D and production of Lifepo4 batteries,energy storage battery,portable UPS power supply,personalized customization lithium battery pack etc .
Environmental cylindrical 18650 21700 32700 26650 14500 18500 lithium ion rechargeable battery, LifePO4 battery,3.7V lithium polymer battery, NiMH battery , NiCD battery ,Lead acid battery,dry cell battery ,alkaline battery ,heavy duty battery, button cell battery etc. we devote to R&D,innovation ,production & sales
Shenzhen Green Power Energy Battery Co.,ltd specializes in a wide range of digital battery such as environmental cylindrical 18650 21700 32700 26650 14500 18500 lithium ion rechargeable battery, LifePO4 battery, 3.7V lithium polymer battery, NiMH battery, NiCD battery, dry cell battery, alkaline battery, heavy duty battery, button cell battery etc. we devote to R&D, innovation, production & sales. With automatic production machines we have been exported goods to all over the world over 15years. We have complete exported certificate such as KC, CE, UL, BSCI, ROHS, BIS, SGS, PSE etc
Dongguan Datapower New Energy Co.,ltd is a high-tech production enterprise which specialize in the R&D and production&sale of lithium polymer batteries,drone battery,airplane batteries &battery pack etc.
Anhui Seong-hee New Energy Technology Co.,ltd is a high-tech production enterprise which specialize in the R&D and production of primary batteries. And mainly produces and sells alkaline batteries & carbon zinc batteries. there are size AA, AAA, C, D, 9V etc
Guizhou STD Battery Co.,ltd is a high-tech production enterprise which specialize in the R&D and production & sale of lithium polymer batteries, drone battery, airplane batteries & battery pack etc.
release time:2024-01-09 Hits: Popular:AG11 battery
Lithium iron battery separator production process, lithium battery separator production process principle. As one of the four core materials of lithium batteries, separators are an important part of determining the performance, safety and cost of lithium batteries. The production process of lithium battery separators is divided into two categories: dry production process and wet production process. Dry production process It is further subdivided into one-way stretching process and two-way stretching process.
Lithium iron battery separator production process
The production process of lithium iron battery separators is mainly divided into dry stretching and wet stretching. The many characteristics that lithium battery separators need to possess put forward special requirements for its production process, which includes raw material formula and rapid formula adjustment, micropore preparation technology, and independent design of complete sets of equipment.
The dry uniaxial stretching process is a method of producing hard elastic fibers to prepare highly oriented polypropylene or polyethylene films with low crystallinity. During the high-temperature annealing process, a film with high crystallinity is obtained. This film is first stretched at low temperatures to form micro-defects, and then at high temperatures the defects are pulled apart to form micropores. At present, more than one-third of China's production capacity uses the dry double drawing process, and its products occupy a large proportion of the mid- to low-end market.
Wet production process, also known as phase separation method or thermal phase separation method, wet process mixes liquid hydrocarbons or some small molecular substances with polyolefin resin. After heating and melting, a uniform mixture is formed, and then the temperature is cooled for phase separation and pressing. The membrane is obtained, and then the membrane is heated to a temperature close to the melting point, biaxially stretched to orient the molecular chains, and finally kept warm for a certain period of time. The residual solvent is eluted with volatile substances to prepare interconnected microporous membrane materials.
The wet production process can not only prepare interconnected microporous membrane materials, but also produce lithium battery separators with high longitudinal and transverse strength. At present, the wet production process is mainly used to produce single-layer lithium battery separators.
Lithium battery separator production process principle
1. Dry method - The polyolefin resin is first melted, extruded and blown to form a crystalline polymer film, then crystallized heat treatment and annealing operations are performed to obtain a highly oriented film structure, and then stretched at high temperature. Test the crystal cross-section separation to form a porous structure battery separator. The dry process can also be divided into uniaxial stretching and biaxial stretching.
2. Wet method - Traditional wet method preparation is mainly based on phase inversion method, and in recent years, TIPS thermally induced phase separation method is mainly used. The principle is to mix crystalline polymers, thermoplastic polymers and small molecule chemical diluents with high boiling points (such as paraffin oil) to form a homogeneous solution at high temperature, and then lower the solution temperature to cause solid-liquid phase separation of the mixture. Or liquid-liquid separation, extracting and removing small molecule chemical diluents to form a porous membrane of thermoplastic and crystalline polymers.
The main characteristics of the lithium battery separator wet process are high cost, large investment, high equipment requirements, long construction and production cycle, large energy consumption during the production process, and the use of organic solvents. However, the wet process can better control the pore size, distribution and porosity, so it is generally used to manufacture high-end films.
The raw material of dry process is generally PP, while the raw material of wet process is generally PE. Generally speaking, the melting temperature of PP is around 170°C, and the melting temperature of PE is around 140°C. Therefore, although the separator produced by the wet process is thinner, the lower melting temperature makes the separator easy to shrink at high temperatures, causing a short circuit in the battery, and the safety of the battery cannot be guaranteed. Coating a layer of inorganic nanoparticles or high-temperature-resistant organic chemicals on the surface of the separator can improve the high-temperature safety performance of the separator and can well make up for this shortcoming of the wet process.
Lithium battery separator dry single drawing process flow
Feeding: After preprocessing raw materials such as PE or PP and additives according to the formula, they are transported to the extrusion system.
Casting: The pretreated raw materials are melted and plasticized in the extrusion system and then the melt is extruded from the die. The melt forms a base film with a specific crystal structure after casting.
Heat treatment: The base film is heat treated to obtain a hard elastic film.
Stretching: The hard elastic film is cold stretched and hot stretched to form a nano-porous film.
Slitting: Cut the nano-microporous membrane into finished membranes according to customer specifications.
Wet asynchronous stretching process
Feeding: PE, pore-forming agent and other raw materials are pretreated according to the formula and transported to the extrusion system.
Casting: The pretreated raw materials are melted and plasticized in a twin-screw extrusion system and then the melt is extruded from the die. After casting, the melt forms a cast thick sheet containing a pore-forming agent.
Longitudinal stretching: Longitudinal stretching of cast thick sheets.
Transverse stretching: The cast thick sheet after longitudinal stretching is stretched transversely to obtain a base film containing a pore-forming agent.
Extraction: The base film is extracted with a solvent to form a base film without pore-forming agents.
Shaping: The base film without pore-forming agent is dried and shaped to obtain a nano-porous membrane.
Slitting: Cut the nano-microporous membrane into finished membranes according to customer specifications.
The performance of diaphragm products is affected by the base material and manufacturing process. The stability, consistency, and safety of the separator have a decisive impact on the discharge rate, energy density, cycle life, and safety of lithium batteries. . From the perspective of product strength, the comprehensive performance of wet separators is stronger than that of dry separators.
Read recommendations:
What are the effects of lithium battery protection board?energy storage system lithium battery Manuf
Lithium battery manufacturers' depiction of shell characteristics.CR2032 battery
Last article:AA Dry Battery.U.S. Department of Energy 350Wh/kg battery research progress in 2017
Next article:1.5v Dry Battery.What are the main production processes for lithium battery packs?
Popular recommendation
home solar energy storage lithium battery sales
2023-05-10551235 battery company
2023-03-2214250 battery direct sales
2023-03-22AA Ni-MH battery manufacturer
2023-03-22li ion 18650 battery pack direct sales
2023-05-09902030 500MAH 3.7V
2023-06-10Coin Battery CR 1216
2022-09-27Plastic pet muzzle
2022-09-22Ni-MH AAA500mAh 1.2V
2022-07-01505060 2000MAH 7.4V
2023-06-103.2V 310Ah
2022-10-12701221 120mAh 3.7V
2022-08-19Coin Battery CR 2016
2022-09-27Printed hair curler
2022-09-22Home energy storage battery GN-BOX3
2022-09-27AAA NiMH batteries
2023-06-25CR1625 battery
2023-06-2518650 battery pack Manufacturing
2023-06-25battery 18650 genuine
2023-06-25602248 lipo battery
2023-06-25Cylindrical lithium battery cell
2022-12-02Introduction to Lithium Battery
2024-05-226000mah 3.2v lifepo4 battery.What are the purchasing tips for mobile power charging banks
2023-11-07Power battery manufacturers explain the correct use of high Lithium battery of electric vehicles.LR4
2023-06-16Knowledge of Forklifts and Forklift Batteries
2024-05-24Lithium battery UPS system advantage.CR2477 battery
2023-06-07Basic role of battery management system.household energy storage battery direct sales
2023-04-20Can lithium battery manufacturers popularize the component performance of lithium power batteries?
2023-09-04What is a lithium iron phosphate battery?
2022-11-2418650 lithium battery pack correct storage method.solar energy storage lithium ion battery 15kwh 48v
2023-03-23