Aluminum-plastic composite film, also called "aluminum-plastic packaging film", is the outer packaging material for soft-pack lithium-ion batteries. It is a high-strength, aluminum-plated packaging film and high barrier multilayer composite composed of a variety of plastics, aluminum foil and adhesives. Data, technical requirements are relatively strict. Originally, the current global market size of aluminum-plastic packaging film is about 2 billion to 3 billion, but thanks to the rapid development of professional consumer electronics and electric cars, it is estimated that it will increase at a rate of 40% per year in the next three years. A shopping mall with a level of 10 billion and excess profits. For example, Nissan’s first mass-produced lithium-ion hybrid electric vehicle, BMW 7-series hybrid electric vehicle, and some domestic models in Vientiane. Most of these new energy cars use soft-pack batteries, which are lithium-inductive membranes. Ion battery. Heat shrinkable bag
The sales of new energy cars have also accelerated the development of soft-pack lithium-ion batteries. Therefore, according to professional calculations, the compound increase rate of lithium-ion batteries for cars from 2014 to 2018 will remain above 70%. In this way, by 2018, Global Cars The output value of lithium-ion batteries used will exceed the output value of small aluminum power, so cars are a boost for growth. Other lithium-ion batteries will have one or two end-uses every year, which has continuously expanded the demand for aluminum-plastic packaging film. For example, lithium-ion batteries were first used in mobile phones, later in notebook computers, tablet computers, and later to electric toothbrushes, electric shavers, and power tools. Lithium-ion batteries are constantly opening up new areas. It is estimated that by 2014 wearable devices will show a substantial increase in volume, and this is an accelerated weight for lithium-ion batteries.
There are two major types of lithium ion batteries: liquid lithium ion and polymer lithium ion. Commonly known as liquid lithium ion is that we use liquid electrolyte, square aluminum shell or cylindrical steel shell packaging, while polymer lithium ion battery is a solid polymer electrolyte in a gluey state, it uses a composite aluminum-plastic packaging Membrane, also commonly known as soft pack battery. This mall is mainly used in smart phones, tablet computers and wearable devices, so that it is very sensitive to the needs of the appearance. The flexible packaging battery accounts for the majority of the share. Therefore, in the world market, 90% of the global market share is monopolized by Japan's Showa Denko and DNP oligarchs, and South Korea also has some output value.
The polymer lithium ion battery cell uses aluminum-plastic film packaging technology. When gas is generated inside the battery cell due to an abnormal chemical reaction, the Pocket will be charged and the battery cell swells (there are two conditions: slight swelling and severe swelling) ), and regardless of the appearance, the performance of the battery cell (Capacity, Cyclelife, C-rate, etc.) will suffer severe failure, making the battery cell unusable. Flatulence will occur during the production process and will also be in the hands of customers and even later users. Of course, the battery cell will normally generate a corresponding amount (generally a small amount) of gas during the formation or Baking process. This depends on the raw materials used. This gas will be pumped out in the Degassing process. At present, some models (one-time packaging and molding battery cells) have added V18 solvent to eliminate the gas generated by the formation of the SEI layer and the punctuality of the phase interface. However, the gas generated by the abnormal process is very obvious before Degassing, or the gas generated after Degassing cannot be eliminated or the increase in V18 cannot be eliminated.
With the gradual increase in the soft-pack lithium battery market, the demand for aluminum-plastic packaging film products is also increasing in the same proportion. The annual increase rate is above 20%. In view of the high technical barriers of aluminum-plastic packaging film, my country's aluminum-plastic packaging film market has always been monopolized by Japanese manufacturers such as DNP and Showa Denko. The market share of DNP and Showa in Japan exceeds 90%. Under the pressure of capital, domestic soft-pack battery companies have always called for the promotion of localization of aluminum-plastic packaging film. In fact, aluminum-plastic packaging film products have become an important raw material for the localization of all raw materials for soft-pack lithium batteries in the mid and late stages.
Aluminum-plastic packaging film products must ensure the long-term, stable and stable operation of the battery. Aluminum-plastic packaging film needs to have high barrier properties, formability, corrosion resistance and many other requirements. In order to satisfy the above requirements. Aluminum-plastic packaging film has a high demand for materials and technology. Since polymer lithium-ion batteries were successfully developed in the laboratory in 1996, and the mass production time is not long, the development of aluminum-plastic packaging film is later than the battery, and there is no global standard. There are very few domestic manufacturers conducting in-depth research. , There is no standard to follow.
It is foreseeable that the demand for specific capacity and stability of lithium batteries in downstream shopping malls is getting higher and higher. Traditional steel shell and aluminum shell lithium batteries are now increasingly unsatisfactory. It is estimated that in the next few years, my country’s flexible packaging The polymer lithium battery industry will continue to increase steadily. This will also drive the rapid development of the aluminum-plastic packaging film industry. In the future, the aluminum-plastic packaging film commodity market is bound to be the country of Chinese enterprises.