What are the technical requirements for 18650 1800mah batteryflexible packaging materials?

　　Technical requirements for flexible packaging materials

　　Since polymer lithium-ion batteries were successfully developed in the laboratory only in 1996, and mass production only took three or four years, the packaging film was developed later than the 18650 1800mah batteryand has not formed an international standard. There are very few domestic manufacturers that have conducted in-depth research. , and there is no standard to follow. The 18650 1800mah batterypackaging film developed by our company is gradually formed after nearly two years of communication and cooperation with domestic powerful lithium-ion 18650 1800mah batteryfactories (Xiamen Baolong Industry, Huizhou TCL All-in-one, Dongguan New Energy ATL, Shunde Jingjin Electronics, etc.) Some basic requirements for product quality. These basic requirements have become the technical indicators of current products. Some of them can be quantitatively described and can be detected by appropriate methods, but some cannot be detected by advanced methods. Some requirements can only be described qualitatively, and no suitable method can be found for testing. In addition, with the improvement of 18650 1800mah batteryfactory processes, technological progress, and the improvement of 18650 1800mah batteryperformance requirements, many indicators will also change accordingly. In particular, with the in-depth research on the electrical properties of the 18650 1800mah batteryitself, newer technical requirements will also be proposed. . These requirements will be an important part of future technical standards. The following is an introduction to the existing technical requirements of this product.

　　1. Appearance: Defects such as pinholes, foreign matter, adhesion, uneven coating, separation between composite guides and obvious damage, bubbles, wrinkles, dirt, etc. are not allowed.

　　2. Thickness: The total thickness of the composite film should be within 150u (formed) and within 120u (non-formed).

　　3. Barrier properties:

　　1. Water vapor transmission rate<10-4g/m2·d.1atm2, oxygen transmission volume<0.1cm3/m2·d.1atm

　　4. Cold stamping formability;

　　1. The depth of cold stamping is 3-8mm2. No delamination, cracking, or pinhole light leakage is allowed. 3. Shape retention, deformation degree a<50

　　5. Heat sealing strength: When the inner membrane is soaked and penetrated by the electrolyte to the third seal (about 12 days), the sealing strength is >40u/15mm.

　　6. Emu blister performance: The finished 18650 1800mah batteryis soaked in water at room temperature for 20 days and is tightly sealed without any air bubbles.

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