Should the lithium iron phosphate battery use a soft pack or a hard pack?

The difference between a soft pack lithium battery and a hard pack lithium battery lies in the material of the outer shell of the lithium battery. The weight of the steel shell battery is more important than that of the battery of the same volume, but it is not easy to distinguish between the aluminum shell and the flexible package, but the flexible package battery will be a little softer than the aluminum shell battery, and it is easy to deform by breaking it by hand.

　　 Regarding the question of whether the lithium iron phosphate battery is a soft pack or a hard pack, we can first understand the characteristics of the two.

　　Soft pack lithium battery introduction

　　The soft pack lithium battery is just the liquid lithium ion battery covered with a polymer shell. In the structure, the aluminum-plastic film packaging is used, and the soft-packed battery will only be vented and cracked in the event of a safety hazard. Soft pack lithium battery is also another name for polymer battery.

　　 Hard pack lithium battery introduction

　　 Hard-pack lithium batteries are subdivided into two types: cylindrical and square. The packaging structure has its own advantages and disadvantages, mainly for different demand places.

　　◆Cylindrical hard pack lithium battery

Cylindrical lithium battery production technology is mature, automatic production is high, and PACK cost is low; there are many models, such as 18650, 21700, 26500, etc.; cylindrical battery has various forms, suitable for full layout of electric vehicle space design; cylindrical battery pack The heat dissipation area is large, and the steel shell or aluminum shell is generally used for packaging with relatively low specific energy.

　　◆Square hard pack lithium battery

　　Aluminum shell square and cylindrical type are generally aluminum shells, and the protection effect of the battery core is better than that of the soft pack battery, and the safety of the battery core has been greatly improved compared with the cylindrical battery. However, it is difficult to guarantee consistency, too many models, difficult to unify the process, suitable for customized production, and inconvenient for the automated production of lithium battery packs.

　　Comparison between soft pack lithium battery and hard pack lithium battery

  weight

　　The soft pack lithium battery is 40% lighter and 20% lighter than the steel shell lithium battery and aluminum shell lithium battery of the same capacity. In terms of weight, soft-pack lithium batteries are much lighter than hard-pack lithium batteries, but the main weight ratio lies in the weight of the two casings.

  capacity

　　 The soft-pack lithium battery is 10% to 15% and 5 to 10% higher than the steel shell battery and aluminum shell battery of the same size. Although in terms of capacity, soft-pack lithium batteries are not much higher than hard-pack lithium batteries, there is a certain gap between the two. For areas with high capacity requirements, the application of soft-pack lithium batteries is still higher than that of hard-pack lithium batteries. lithium battery.

　　Shape

Because the internal battery of the soft-packed lithium battery is liquid, its appearance can usually have a variety of shapes. This feature has a great advantage over the hard-packed lithium battery in areas that have specific requirements for the shape of the lithium battery. .

Compared with hard-packed lithium batteries, soft-packed lithium batteries have more or less advantages in terms of weight, capacity, and shape. However, the existing core models of soft-packed lithium batteries are still relatively small, and new ones are developed. The model cost is also high, so the market demand that the soft pack lithium battery can meet is still less.

　　 Nowadays, the market share of the two types of lithium battery packs, soft-pack lithium batteries and hard-pack lithium batteries, is not too different. After all, different use environments have different requirements for the outer casing of lithium battery packs. However, with the development of technology, it is impossible to judge how the lithium battery pack market will become in the future.