Cylindrical, square and soft-packed lithium-ion battery packs who will be the mainstream batteries in the future?

by:CTECHi     2021-08-10

Judging from the market development trend in recent years, the proportion of soft-pack lithium-ion battery packs is increasing. Some experts predict that the market share of soft-pack lithium-ion battery packs is likely to reach more than half in the future. .

Next, let us briefly understand the advantages and disadvantages of these three different packaging forms of lithium-ion battery packs, and then we can understand why the soft-packed lithium-ion battery packs Will become the mainstream battery in the future.

Advantages

Cylindrical lithium-ion battery is the earliest mature industrialized lithium-ion battery product. Nowadays, the production process of cylindrical lithium-ion batteries is mature, the production efficiency is higher, and the cost is relatively low. Therefore, the cost of PACK is relatively low. The yield of lithium-ion batteries is higher than that of square lithium-ion batteries and soft-pack lithium-ion batteries. To be high, its consistency and security are also relatively good.

Disadvantages

Because cylindrical lithium-ion batteries are generally encapsulated in steel, they are relatively safe, but their weight is relatively low. It will also be heavier because of this, which will also make the specific energy of the lithium-ion battery pack relatively low.

Rectangular lithium ion battery pack

Advantages

Rectangular lithium battery The packaging shells of ion batteries are mostly made of aluminum alloy and stainless steel. The inside of the battery adopts a winding or laminated process. The protection of the battery cell is better than that of the soft pack lithium ion battery. The safety of the battery cell is better than that of the soft pack lithium ion battery. Cylindrical lithium-ion batteries have also been greatly improved.

Disadvantages

Since the square lithium-ion battery pack can be customized according to the size of the product, it will also make There are many different types of square lithium-ion batteries on the market. Too many different types of lithium-ion batteries will make it difficult to unify the process, making the level of automation not high, and the monomers are quite different. There may also be groups of square lithium-ion battery packs that are much lower than that of a single lithium-ion battery. life.

Soft pack lithium ion battery

Soft pack lithium ion battery pack

Advantages

Soft-pack lithium-ion batteries use polymer electrolytes and soft packaging materials, which are the most critical and technically difficult materials in soft-pack lithium-ion batteries. The soft packaging material means that the soft pack lithium-ion battery can also be customized according to the requirements of customers. Soft-packed lithium-ion batteries are not explosive like square lithium-ion batteries and cylindrical lithium-ion batteries, and they are lighter than other batteries.

Disadvantages

Although the shape of the soft-pack lithium-ion battery can be customized according to customer needs, the existing soft There are fewer battery cell models, which cannot meet the needs of the market, and the cost of developing new models is relatively high. In addition to the high development cost, the material cost of soft-pack lithium-ion batteries is higher than that of cylindrical and square batteries. The cost issue is the key point for soft-pack lithium-ion battery companies to break through in the future.

The safety, weight, and capacity of soft-pack lithium-ion battery packs are better than cylindrical lithium-ion battery packs and square lithium-ion battery packs, and its internal resistance is better than Hard-packed lithium-ion batteries are also smaller, which greatly reduces the self-consumption of lithium-ion batteries. Although soft-packed lithium-ion battery packs also have disadvantages, they are still not concealed compared to their advantages. Compared with cylindrical, square and soft-packed lithium-ion battery packs, soft-packed lithium-ion battery packs are more likely to become mainstream batteries in the future. .

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