The characteristics and differences between lithium battery hard packs and lithium battery soft packs

Soft-pack polymer lithium batteries are actually battery cells that use aluminum-plastic packaging film as the packaging material. It is worth noting that the packaging of lithium batteries is further classified into two types: one is the pouch cell, and the other is the metal-cased cell. The difference between lithium batteries usually refers to the material of the lithium battery casing. Soft-packaged batteries are a bit softer than aluminum-shell lithium battery packs and are very likely to deform when bent with the palm of your hand. So today, let's take a look at the characteristics and differences between lithium battery soft-pack and lithium battery hard-pack.

What is a pouch polymer lithium battery

Soft-pack polymer lithium batteries, in fact, are further divided into soft-pack lithium batteries and polymer lithium batteries. The difference between them is that in polymer lithium batteries, there is a colloidal electrolyte inside, and the outside feels relatively hard when touched. The electrolyte inside the soft-pack lithium battery is liquid, and the outside of the battery feels slightly soft. In fact, the soft-pack lithium battery was invented after weighing the pros and cons because the production process of polymer lithium batteries is not mature so far. Considering the relatively low cost and stable performance parameters under basic application conditions, it has occupied a large part of the 3c digital battery industry market so far.

The new batch of polymer lithium-ion batteries can achieve thinness in shape (ATL batteries can be ultra-thin to 0.5mm, equivalent to the thickness of a whole credit card), certain area and random shape, significantly enhancing the operational flexibility of battery product appearance design. As a result, they can be made into batteries of any shape and volume according to product requirements. It brings a high degree of design concept, operational flexibility and adaptability to the power supply solutions for application machine equipment service providers, in order to optimize the performance parameters of their products to the greatest extent.

Characteristics and differences between soft-pack and hard-pack lithium batteries:

Soft-pack lithium battery: A soft-pack lithium battery is merely a thin polymer shell wrapped around a liquid lithium battery pack. In terms of structure, it is packaged with aluminum-plastic film. In the event of potential safety hazards, the soft-pack battery always has a bulging mouth and cracks.

The structural features of pouch lithium batteries: The key materials used in pouch lithium batteries - cathode material, anode material and separator - do not differ much from 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 crucial and technologically advanced material in pouch lithium batteries.

The advantages of soft-pack lithium batteries

It has a wide range of applications.

In terms of the shape of pouch polymer lithium batteries, pouch batteries can take on any form. For motor vehicles, assembling pouch batteries can increase the space of the vehicle. On the other hand, the assembly position of pouch batteries is not affected by the structural type of the motor vehicle.

It is very thin and takes up little space. For pouch batteries, the battery can be made even thinner. The overall operational flexibility and compatibility of pouch batteries are relatively high. For automotive enterprises, it has great appeal in terms of design concepts and other aspects.

The safety performance is high. The structure type of the pouch battery adopts aluminum-plastic film packaging. The greatest competitive advantage of the aluminum film packaging is its certain softness. When the battery has a safety factor problem, the pouch battery usually pups and cracks, and the liquid inside leaks out, which will not cause the gas to be unable to be discharged and thus lead to an explosion or fire.

The soft-pack polymer lithium battery is small in size and light in weight. In terms of capacity, it is light in weight, but on the other hand, it can handle a large capacity, has a low internal resistance, and features a flexible design concept. It began to gradually demonstrate its competitive advantages and its important position became prominent.

Low internal resistance. The internal resistance of pouch batteries is smaller than that of lithium batteries. Currently, the internal resistance of domestic brand pouch battery cells can be as low as below 35mΩ, which greatly reduces the self-discharge of lithium battery packs.

The shape of the flexible soft-pack lithium battery can be customized according to the market demand of customers, and the battery cell model can be expanded in the market.

Hard-pack lithium batteries: They can be further classified into two types: cylindrical and square. The structures of encapsulation vary. The advantages and disadvantages of each mainly depend on the different market demand venues. Ensuring the consistency of hard-pack lithium batteries is relatively difficult. With an increasing number of models, it is hard to maintain consistent processing techniques. Customized production is not suitable, and it is not convenient for the automated production of lithium battery packs.