The difference between lithium polymer and 18650 batteries

Relatively speaking, the mobile power supply of polymer lithium battery should be the best in current storage capacity and safety performance. Moreover, even if the polymer cell is short-circuited, it will not explode. At most, it will expand, which is longer and safer than the 18650 cell. The 18650 battery refers to the battery with a diameter of 18mm and a length of 65mm. The cylindrical battery has been slowly eliminated. The biggest disadvantage of using 18650 batteries is short service life, low safety performance. There are some differences between chargers using 18650 cells and polymer cells. One of the disadvantages of the 18650 batteries is that they have leaked electricity. Have you ever used a full charge? When you use it again after 2 days, you will find that the power is low. The polymer battery will not have such a problem. Therefore, if you buy it outside, it’s best to use a charger with a polymer battery. If you want to use 18650 batteries, it’s better to assemble it yourself. You can assemble a 10000mAh charger instead of 500, because some small brands charger is also assembled by others, and some will empty mark power, not as cost-effective as your own assembly. If your mobile phone receives the highest 1A, you can use 1Acharging with 2.1Aport, and you can use it at ease.

Lithium polymer battery refers to all solid state or gel as the electrolyte Lithium ion batteries. Generally USES aluminum-plastic composite membrane as a packaging material. Only two in the world is really the lithium polymer battery. One is Japan's SONY, one is the ATL in China

Lithium battery is usually refers to Aluminum shell battery, it is a liquid electrolyte, aluminum shell, packaging materials,

Lithium polymer battery is safe than lithium battery. Lithium polymer battery is lithium ion battery upgrading products. Relative to the lithium ion battery in fashion now, it has a large capacity, small in size (thin), security (not bang), etc. However, because of the whole industry chain of generation, its cost (cost) is still relatively high, only used in high-end digital products (ultrathin laptop computers, etc.).

Predictably, in the next 5-10 years, lithium polymer battery will replace the existing lithium-ion batteries! In fact, in the electronics industry more developed countries such as Japan and South Korea the popularity rate of lithium polymer battery has reached a certain level, only in this respect is relatively backward in our country, let us wait and see!, etc in the near future with lithium polymer battery cell phone cheaper, I have to change a new cell phone this safer (battery)!

Lithium polymer battery (Li - polymer, also known as the polymer lithium battery) : with high energy density, miniaturization, ultra-thin, lightweight, and high safety and low cost, and other obvious advantages, is a new type of battery. In shape, lithium polymer battery with ultra-thin characteristics, can match the needs of the various products, made into any shape and the capacity of the battery. The battery can reach the minimum thickness of 0.5 mm. Relative to the lithium ion battery, lithium polymer battery characteristics are as follows:

1. No battery leakage problems, its inside the battery does not contain liquid electrolyte, the use of colloidal solids.

2. Can be made into a thin battery: with a capacity of 3.6V400mAh, its thickness can be as thin as 0.5mm.

3. The battery can be designed into various shapes.

4. The battery can be bending deformation: polymer battery maximum bending around 90 °.

5. Can be made into a single high voltage: liquid electrolyte battery only with the number of cells in series with high voltage, and the polymer batteries as there is no liquid itself, can be made within the single star multilayer combination to achieve high voltage.

6. Capacity will is more than double that of the same size of lithium ion batteries.

The so-called polymer lithium battery refers to a lithium ion battery using a polymer as an electrolyte, and is specifically classified into two types of "semi-polymer" and "all-polymer". "Semi-polymer" means applying a layer of polymer (typically PVDF) to the separator to make the cell more adhesive, the battery can be made harder, and the electrolyte is still a liquid electrolyte. By "all polymer" is meant the use of a polymer to form a gel network inside the cell and then injecting an electrolyte to form an electrolyte. Although "all-polymer" batteries still use liquid electrolytes, they are used in much smaller quantities, which greatly improve the safety performance of lithium-ion batteries. As far as I know, only SONY is now mass-produced "all-polymer" lithium-ion batteries.

On the other hand, polymer battery is refers to the use of aluminum-plastic packaging film packaging of lithium ion battery, which is commonly known as soft package of batteries. This kind of packaging film consists of three layers, namely, PP, Al layer and nylon layer, because PP and nylon is a polymer, so this kind of batteries is known as the polymer battery.

1, the price is lower

18650 of the international price around 1usd/PCS, according to the 2 Ah to calculate words is about 3 RMB/Ah. And polymer lithium electricity price and low-end fortress factory in 4 RMB/Ah, in the end in 5 ~ 7 RMB/Ah, high end over 7 RMB/Ah. Such as ATL, Lishen, generally can sell for around 10 RMB/Ah, and single small family also don't want to meet you.

2, not customizable

SONY has always wanted to make lithium-ion batteries the same as alkaline batteries. There are certain industry standards, like the 5th and 7th batteries, which are basically the same in the world. However, one of the great advantages of lithium-ion batteries is that they can be designed according to the needs of customers. It is impossible to have a unified standard. So now, the lithium-ion battery industry is basically only a standard model of 18650. Others are based on customers. The requirements are designed.

3, poor security

We know that the lithium ion battery in extreme circumstances (such as overcharge, high temperature, etc.), severe chemical reactions that can occur within the gas.18650 battery using the metal shell, there is a certain strength, when the internal pressure reaches a certain steel shell explosion will burst, very terrorist safe accidents.

This is why rooms that test 18650 batteries generally must be protected in layers, and they must not be tested when tested. Polymer batteries do not have this problem. Even in extreme cases, because of the low strength of the packaging film, as long as the air pressure is slightly higher, it will rupture and will not explode. The worst case is burning. Therefore, the polymer battery is superior to the 18650 battery in terms of safety.

4, low energy density

The average 18650 battery capacities can be about 2200mAh, so the energy density is about 500Wh/L, and the energy density of the polymer battery can be close to 600Wh/L.

But polymer batteries also have their own drawbacks. Mainly because of the higher cost, because it can be designed according to customer needs, the research and development costs inside should be counted. Moreover, the variety of shapes and types, resulting in various fixtures in the manufacturing process are non-standard parts, and correspondingly increased costs. The versatility of the polymer battery itself is poor, which is also brought about by the flexible design. It is often necessary to redesign the customer for the difference of 1mm.

3, the application of 18650 lithium-ion batteries

The application of lithium secondary batteries in the energy battery industry benefits from its superior performance. With the continuous development of lithium secondary battery technology, it has been widely used in our daily life; rechargeable batteries that are used repeatedly are increasingly favored by consumers. Pay attention to the energy battery industry, fully understand the battery and let us do it for me. At present, the 18650 lithium battery has certain applications in the following fields.

1, energy storage

Mainly used in base station power, clean energy storage, grid power storage, home optical storage system.

2, power class

Mainly refers to electric vehicles, electric bicycles and new energy vehicles and so on.

3, digital

Mobile phone, tablet, notebook computers, electric toys, MP3/MP4, headphones, charging treasure, model aircraft, mobile power supply, etc.

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