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18650 lithium battery contrast polymer battery

Author: Source: Datetime: 2016-11-24 15:34:27

The so-called polymer lithium battery refers to the use of the polymer as the electrolyte of lithium ion batteries, the specific point is divided into "semi - polymer" and "all - polymer" two. "Semi polymer" refers to the isolation film coated with a layer of polymer (generally PVDF), so that the adhesive force of the electric core stronger, the battery can be done more hard, the electrolyte is still liquid electrolyte.


The "full polymer" refers to the use of polymer in the formation of gel network inside the core, and then injected into the electrolyte electrolyte. Although the whole polymer battery is still to use liquid electrolyte, but the amount is much less, which has a great improvement on the safety performance of lithium-ion batteries. As far as the author knows, only SONY in the production of "all polymer" lithium-ion battery. The polymer battery also can be used in solar power generator.


On the other hand, polymer battery refers to the use of plastic packaging film as a lithium ion battery packaging, also known as soft cell. The packaging film is composed of three layers, which are PP layer, Al layer and nylon layer, and the PP and nylon are polymer, so this kind of electric core is called polymer battery.


1, lower prices


18650 of the international price of about 1USD/pcs, in accordance with the 2Ah to calculate the words about 3RMB/Ah. While the price of low-end lithium polymer, copycat plant in 4RMB/Ah, in the end in 5~7RMB/Ah, in the high-end in more than 7RMB/Ah. Like ATL, force god this kind of, generally can sell to 10RMB/Ah or so, and you alone small people still don't want to connect.


2, can not be customized


SONY has always wanted to put the lithium-ion battery as an imaging alkaline battery, there is a certain industrial standards, like the 5 battery, battery 7, the world is basically the same. But because of one of the advantages of lithium ion batteries that can design according to customer demand, can not have a uniform standard, so now the lithium-ion battery industry basically only 18650 of this standard model, the battery also can be used in solar powered portable generator the other is according to the customer demand design.


3, poor security

We know that the lithium-ion battery in extreme cases (such as over charge, high temperature, etc.), the internal will be a violent chemical reaction, resulting in a large number of gas. 18650 the use of the battery is a metal shell, there is a certain intensity, when the internal pressure to reach a certain time the steel shell will rupture and explosion, the occurrence of a very terrorist security incidents.


This is why the test 18650 battery room in general must be protected with layers, and the test can not enter the person. Polymer batteries do not have this problem, even in extreme cases, due to the low strength of the packaging film, as long as the pressure is slightly higher will break down, will not produce an explosion, the worst case is burning. So from the safety of the polymer battery is better than 18650 batteries. The polymer battery also can be used in solar backup generator.


4, low energy density


General 18650 battery capacity can do about 2200mAh, so that the calculation of the energy density of about 500Wh/L, and the energy density of the polymer battery production at this stage can be close to 600Wh/L.


But the polymer battery also has its own disadvantages. The cost is higher, because it can be designed according to customer demand, the cost of research and development in the inside to be considered. And the appearance of a variety of different types, resulting in the manufacturing process of a variety of fixture is not standard parts, but also the corresponding increase in the cost of. The versatility of the polymer battery itself is poor, which is also a flexible design brings, often in order to then 1mm the difference between the need to re design a customer.

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