What is a soft-pack polymer lithium battery?
Soft-pack polymer lithium batteries are actually divided into soft-pack lithium batteries and polymer lithium batteries. The difference between them is that in polymer lithium batteries, there is a gel-like electrolyte inside, and it feels a bit hard when touched; in soft-pack lithium batteries, the electrolyte is in a liquid state, and the outside of the battery feels slightly softer.In fact, soft-pack lithium batteries were invented by weighing the pros and cons considering the currently immature production process of polymer lithium batteries. Considering the relatively lower cost and stable performance parameters under basic usage conditions, they have occupied a large portion of the 3C digital device battery market so far. 

The new batch of polymer lithium-ion batteries have achieved thinning (ATL batteries can be made ultra-thin to 0.5 millimeters, which is as thin as a single credit card), reduction in size, and random shape. This significantly enhances the operational flexibility of the battery product's appearance design, enabling it to be customized to meet product requirements and manufactured into batteries of any shape and volume. This brings a highly flexible design concept and adaptability to the power solution for application equipment service providers, maximizing the optimization of their product performance parameters. 

Soft-pack polymer lithium batteries are actually battery cells that use aluminum-plastic packaging films as the packaging material. It is worth noting that the packaging of lithium batteries is divided into these two types. One is the soft-pack battery cell, and the other is the metal-shell battery cell. The main difference between lithium batteries usually refers to the material of the battery shell. The soft-pack battery is slightly softer than the aluminum-shell lithium battery pack, and it is very easy to deform when you try to bend it with your palm. So today, let's take a look at the characteristics and differences between lithium battery soft packs and lithium battery hard packs. 

Hard-pack lithium batteries: There are two types of sub-segments: cylindrical and square. The packaging structures are different. The advantages and disadvantages of each mainly depend on different market demand scenarios. Ensuring consistency for hard-pack lithium batteries is relatively difficult. With an increasing number of models, it is difficult to maintain consistent processing techniques. Customized production is suitable, but it is not convenient for the automation production of lithium battery packs. 

Characteristics and differences between soft and hard lithium battery packages:
Soft lithium battery package: A soft lithium battery package is just a liquid lithium battery with a thin layer of polymer casing. In terms of structure, it uses aluminum-plastic film packaging. In case of potential safety hazards, the soft battery package is most likely t
o burst and crack. 

The structural characteristics of soft-pack lithium batteries: The key materials used in soft-pack lithium batteries - the positive electrode material, the negative electrode material and the separator - do not differ much from those of traditional aluminum shell and aluminum shell lithium batteries. The biggest difference lies in the soft packaging material (aluminum-plastic composite film), which is the most critical and technologically advanced material in soft-pack lithium batteries.