Polymer and lithium battery which good? What's the difference?

Source: 2020 - 04 - 04:1 click traffic and lithium polymer battery which good, what is the difference between lithium battery is lithium ion secondary battery charge, look from the exterior, a cylindrical steel shell, square aluminum shell and three kinds of soft package, soft bag is the name of the polymer, it can be seen that the polymer is lithium polymer batteries, is a kind of lithium-ion batteries. In this article, especially cylindrical lithium-ion battery lithium battery. So is better, and lithium polymer battery, is actually in the discussion and cylindrical lithium-ion polymer battery. Let us through the following several aspects of the comparison to find out the answer. 1, material of lithium battery using liquid electrolyte and polymer gel battery electrolyte and solid electrolyte. In fact, domestic polymer didn't really called polymer, is not a real solid, more specifically, there is no liquid flow. This is a digression, I did not speak. 2. Packing method and the appearance of the polymer is encapsulated in the aluminum-plastic film, can be made into any shape, thick or thin, big or small. Lithium batteries are packed in a steel shell. The most common type is 18650, for 18 mm in diameter, height is 65 mm. Shape is fixed. You can't change it. 3. Security within the polymer no liquid flow, no leakage. When the internal temperature is very high, lu: su membrane shell will only expand or bulging, not explode. It is more safe than lithium batteries. Of course, this is not absolute, if the instantaneous current polymer battery is large enough to short circuit, the battery will be spontaneous or explosion. A few years ago, samsung, 三星) Battery explosion, and this association ( lenovo) Recall due to battery failure laptop, also is such. 4. Energy density on average about 18650 battery capacity is 2200 mah, the energy density of about 500 wh/L, and polymer battery production energy density can be close to 600 wh/L. 5. Battery voltage due to polymer battery with polymer materials, so can be made into multi-layer composite in the battery, so as to achieve high pressure, and the nominal capacity of lithium-ion batteries is 3. 6v。 In order to achieve high voltage in the practical application, need more than series of batteries, to form an ideal high-pressure work platform. Polymer battery and lithium battery which is better, therefore, have more advantages than lithium polymer battery. But there is a reasonable, irreplaceable things existed between them. Let's take a look at the last item: 6, the price is the same energy of polymer is usually more expensive than the lithium ion battery. But you can't say this is the shortcoming of polymer. Polymer is increasingly being used to replace consumer electronic products in the lithium battery, such as notebook computers and mobile power supply. In a closed cells, the polymer is required to achieve maximum energy density. Due to the lithium battery fixed shape, cannot be customized according to customer's design. But polymer battery don't have a uniform size, which in turn is a drawback in some ways. Tesla motors used batteries are made from more than 7000, 18650 units by series-parallel, plus the power control system. View, polymer and lithium battery which is better, which is better, still depends on the specific circumstances, can't give a single conclusion.