Comparison of 18650 Lithium Battery and Polymer Battery

Comparison of 18650 lithium battery and polymer battery

The 3.7v 18650 lithium battery is widely used in life, and due to the continuous development and upgrade of energy batteries, lithium battery is more popular, and it can be seen in various devices. The polymer lithium battery is very different from the 18650 lithium battery, the originator of the lithium battery. This kind of battery is coated with some polymer on the outside, so that the battery can have a longer service life. Among them, there is a very The advantageous component is the “all polymer”, which is injected into the electrolyte to form the electrolyte. Let’s look at the comparison between the 18650 lithium battery and the polymer battery.

Comparison of 18650 lithium battery and polymer battery

Lithium polymer battery

1. Security

If it is used in some bad environment, for example, the surrounding environment temperature is too high and the charging time is too long, it will cause some great reactions inside the lithium battery, and a lot of gas will appear inside, there is a danger of explosion. This problem may occur when the traditional 18650 lithium battery is in use. 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 18650 lithium batteries, polymer batteries will not have this kind of situation. Even in some bad conditions, they 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 uniform standard. So far, the lithium battery industry basically only has a standard model of 18650 lithium battery, and the rest are designed according to customer needs.

3. Low energy density

The capacity of the 18650 lithium battery can reach about 2200 mAh, and the energy density is about 500 Wh/L. At present, the mass production of polymer batteries can be close to 600 Wh/L. However, the biggest problem with this type of battery is that the cost of production is more Other types are much higher, because it can be designed according to customer needs, so R&D costs should be included. In addition, due to the variety of shapes and varieties, all kinds of fixtures are non-standard parts in the manufacturing process.

Another disadvantage is that polymer batteries are not very versatile in terms of applicability, 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.

Classification of 18650 lithium batteries

18650 lithium battery

1. According to the actual performance of the battery

According to the actual performance, it can be divided into two categories: power batteries and energy batteries. They have the characteristics of high power density and are mainly used for instantaneous high-power output and output batteries. The power energy lithium battery is accompanied by the emergence of plug-in hybrid vehicles. It requires the battery to have high energy storage, can support long-distance pure electric drive, and have good power characteristics.

2. According to the electrolyte material

If the 18650 lithium battery is divided according to the material, it can be divided into two types, namely liquid lithium battery and polymer lithium battery, of which liquid lithium battery is the most frequently used.

This is the end of the comparison between 18650 lithium battery and polymer battery. When making a selection, you can choose according to your actual needs, so that you can choose a suitable battery for better use. …

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