1. Safety

If it is used in some bad environment, such as the surrounding temperature is too high or the charging time is too long, it will cause some big reactions inside the lithium battery, and a lot of gas will appear inside, which will cause the risk of explosion. The traditional 18650 lithium battery may have this problem when it is used. When the internal pressure reaches a certain level, the steel shell will burst and explode, causing serious safety accidents. It is for this reason that when we test the 18650 lithium battery, we usually build a protective layer outside the test room, and no one can enter during the test.

Compared with the 18650 lithium battery, the polymer battery will not have such a situation. Even in some not very good situations, it will not easily explode. The worst case is burning. Therefore, the safety of polymer batteries is better than that of 18650 lithium batteries.

2. Whether it can be customized

The biggest advantage of lithium batteries is that they can be designed according to customer needs, so there is no unified standard. So far, the lithium battery industry basically has only one standard model, the 18650 lithium battery, and the rest are designed according to customer needs.

3. Low energy density

The capacity of 18650 lithium battery can reach about 2200 mAh, and the energy density is about 500 Wh/L. At present, the mass production of polymer battery can be close to 600 Wh/L, but the biggest problem of this type of battery is that the production cost is much higher than other types. Because it can be designed according to customer needs, it should include R&D costs. In addition, due to the changeable shapes and various types, various tooling fixtures are non-standard parts in the manufacturing process.

Another disadvantage is that polymer batteries are not very good in terms of wide application, which is also brought about by flexible design. It is usually necessary to redesign one for the customer so that the original 1 mm difference can be adjusted.