What is the battery isolation membrane, lithium ion battery isolation membrane
to prevent short circuit in the lithium ion battery leakage, generally more battery electrodes with a layer of plastic film to carry out the isolation of porous structure. Isolation membrane in a thick layer of macroporous polymer compounds added a very thin layer of porous structure of cellulose, more reasonable and effective solution to the Chinese traditional isolation membrane electrode is difficult to prevent leakage and give attention to two or morethings ion efficient transmission differences. Then today, we come to a detailed talk about what is the battery isolation membrane, lithium ion battery isolation membrane.
what is the isolation membrane, the effect of isolation film
the diaphragm is the crucial part of lithium ion battery, anode pole piece is used to separate is microporous membrane, is a nanoscale pore structure characteristics of polymer functional materials. Its primary role is to prevent a short circuit at the same time in the contact between made in accordance with the electrolyte ions. Its performance determines the interface structure characteristics, the internal resistance of battery, etc. , can be directly affects the battery capacity, cycle, and safety performance of the battery.
non-woven membrane craft production process
non-woven fabric is a kind of generated without the spinning weaving fabric, just a short textile fiber or filament for directional or random, generate fabric structure characteristics, then by adopting the method of mechanical, hot glue or chemical reinforcement. It can be used directly polymer sliced, short fibers or filament fiber screen according to various forming methods and consolidation technology generated has soft, good air permeability and structure characteristics of new fiber products. Because of non-woven membrane has a porous structure and the characteristics of low price, in nickel metal hydride, nickel cadmium battery widely used, at present more and more scientific research and technical personnel will non-woven membrane used in lithium ion battery, but belongs to the beginning.
lithium ion batteries with non-woven diaphragm material according to the classification of primary polypropylene non-woven membrane, polyester ( PET) Non-woven fabric membrane, cellulose membrane, etc.
primary technology of non-woven fabrics have so more of the following:
1. Spunlace nonwoven: spunlaced process is the high pressure micro spray water to more than one layer or multilayer fiber net, make the fiber tangled together, and then make the fabric to reinforce and enjoy the corresponding strength.
2。 Heat-sealing non-woven: thermal bonded non-woven refers to the fabric with fibrous or powder hot melt adhesive reinforcement materials, fabric again after heating molten cooling reinforcement and converted into cloth.
3。 Pulp gas flow into a net non-woven: gas flow into a network of non-woven fabric called air-laid paper, dry process of paper making non-woven fabrics. It is the gas flow into a network technology will open pine wood pulp fiber board into a single fiber state, then using the gas flow method makes fiber aggregation in the shade on this network, web reinforcement and converted into cloth.
4。 Wet nonwoven: wet non-woven fiber raw material is placed in a water medium opening into single fiber, at the same time make different fiber ingredients, made from fiber suspension slurry, suspension slurry to the network, fiber under wet condition into a network to reinforce and converted into cloth.
5。 Spun-bonded non-woven: spun-bonded non-woven fabric is a high molecular compound has been after extrusion, stretching and generate continuous filament, filament laid into the net, fiber network again after self bonding, hot glue, chemical bonding method or mechanical reinforcement and reconstruction, make fabric non-woven fabrics.
6。 Melt-blown non-woven, melt-blown non-woven process: high molecular compound feed - - - Melt extrusion - - - Fiber generation - - - Fiber cooling - - - Into the net - - - Reinforcement and converted into cloth.