1. The price is lower. The international price of 18650 is about 1USD/pcs. If calculated according to 2Ah, it is about 3RMB/Ah.The price of polymer lithium batteries, the primary copycat factory is 4RMB/Ah, the medium-real one is 5~7RMB/Ah, and the medium-high-real one is above 7RMB/Ah.Like ATL and Lishen, they can sell for about 10RMB/Ah individually, and people are not happy to pick them up when your order is small.
2. Non-customizable SONY always wants to make lithium-ion batteries like alkaline batteries. There are certain national industry standards, such as No. 5 batteries and No. 7 batteries. Most of the world is the same.However, because one of the major advantages of lithium-ion batteries is that it is possible to design and conceive according to the needs of the consumer, and it is unlikely that there is the same standard, so at the beginning of the lithium-ion battery manufacturing industry, there was only one standard model, 18650, and the others were basically conceived according to customer satisfaction.
3. Poor insurance. We know that lithium-ion batteries will cause intense chemical reactions and form a large amount of gas under their chemical conditions (such as overcharge, high temperature, etc.).The 18650 battery uses a metal shell, which has a certain strength. When the internal air pressure reaches a certain level, the steel shell will crack, causing terrible accidents in insurance production.This is why the individual rooms where the 18650 battery is tested must be maintained layer by layer, and it is judged that no one can enter during the test.This problem does not exist for polymer batteries, even in the case of chemical transformation, because the strength of the packaging film is low, only a slightly higher air pressure will crack and will not form. In the worst case, it will be incinerated.Therefore, polymer batteries are better than 18650 batteries in terms of insurance.
4. The energy density is low. Individual 18650 batteries can have a capacity of about 2200mAh. In this way, the energy density is about 500Wh/L, while the energy density of polymer batteries may be on the verge of 600Wh/L in mass production at this stage.But polymer batteries also have their own problems.It is important that the capital expenditure is higher, because it may be conceived according to customer satisfaction, and the R&D capital expenditure needs to be included in it.Moreover, the shape design is changeable and there are many varieties, which leads to non-standard parts of various tooling fixtures in the manufacturing process, which also increases the cost of capital accordingly.The poor versatility of polymer batteries themselves is also brought about by the idea of mobility. Often for such a 1mm difference, it is necessary to conceive a new one for the consumer.
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