Compared with liquid lithium-ion batteries, polymer square batteries are not only safe, but also have the advantages of being thinner, arbitrarily aread and arbitrarily shaped. The outer casing also uses a lighter aluminum-plastic composite film. However, there may be room for improvement in its low temperature discharge performance.
　　 Due to the different production processes of various manufacturers, the polymer lithium battery on the market is divided into two types: winding type and laminated type (represented by TCL and ATL), but the specifications suitable for the demand of mobile phones are mostly below 4 mm thickness. Compared with the liquid, the outer packaging of the polymer adopts a thinner aluminum film, which is thinner than the steel shell and the aluminum shell, and the production method is different from the liquid lithium battery. The thinner the polymer, the better the production can theoretically produce 0.5 mm or less. Thickness of the battery.
　　 Liquid lithium battery is just the opposite. The thicker the better the production, the battery with a thickness of less than 4mm is difficult to produce. Even if it is produced, the capacity is obviously not as good as that of polymer lithium battery, and the cost is not superior. Thus, the thinner the battery, the lower the polymer production cost and the higher the liquid production cost.
　　 However, in the thicker specifications, the liquid lithium battery supply chain is mature, the process is mature, the production efficiency is high, the yield is high, and the manufacturing cost advantage is strong. From the market point of view, the liquid lithium battery of the 5mm, 6mm thickness series is much higher than the 3mm, 4mm thickness series polymer square battery, but the price is much lower. In principle, the polymer cost of the polymer square is close to that of the liquid in the 5mm and 6mm thickness specifications. However, the current process cost of the 5mm and 6mm series batteries is much higher than that of the liquid. Therefore, it is necessary to There is still a lot of distance to really form a competition.
　　 The main structure of a typical battery includes three elements: a positive electrode, a negative electrode, and an electrolyte. The so-called polymer lithium ion battery means that at least one or more of the three main structures use a polymer material as a main battery system. In the polymer lithium ion battery system developed, the polymer material is mainly applied to the positive electrode and the electrolyte. The positive electrode material includes a conductive high molecular polymer or an inorganic compound used in a general lithium ion battery, and the electrolyte may be a solid or colloidal polymer electrolyte or an organic electrolyte, and the negative electrode is usually a lithium metal or lithium carbon interlayer compound. In general, lithium ion technology uses a liquid or colloidal electrolyte, so a strong secondary package is required to contain the flammable active ingredient, which adds weight and cost, and also limits dimensional flexibility.
　　 The new generation of polymer lithium-ion batteries can be thinned in shape (the thinnest 0.8 mm), arbitrarily aread and arbitrarily shaped, greatly improving the flexibility of the battery design, so that it can be made to meet the needs of the product. A battery of any shape and capacity provides application equipment developers with a high degree of design flexibility and adaptability in power solutions to maximize their product performance. At the same time, the unit energy of the polymer lithium ion battery is 50% higher than that of the general lithium ion battery, and its capacity, cycle life (more than 500 times) and environmental performance are greatly improved compared with lithium ion batteries.