Difference between 18650 lithium battery and polymer battery

The so-called polymer lithium battery refers to lithium ion batteries using the polymer as the electrolyte, specific divided into semi-conducting polymer and all polymer battery. Semi-conducting polymer refers to a layer of polymer (PVDF) on the isolation membrane coating, which makes batteries bonding strength stronger. The battery can do much more rigid, the electrolyte is still liquid electrolyte. And "all polymer" refers to the use of polymer gel network that is formed within the cell, and then injected into the electrolyte. While "all polymer" will still use liquid electrolyte battery, but a lot less dosage. The safety performance of lithium-ion batteries have greatly improved. Only SONY has mass production 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 1 usd/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, do not order

SONY has been trying to made like alkaline batteries, and lithium ion batteries have a certain industry standard, like 5 batteries, batteries, basically the same all over the world. But because of the big advantage is the lithium ion battery can according to customer demand for design, could not have a unified standard, so until now lithium-ion battery industry basically only 18650 this a standard model, the other is design according to customer requirements.

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 18650 battery test room usually have to use layers of protection, and must not be in when you test. Polymer battery don't have this problem, even though in extreme cases, the same due to the low strength of packaging film, as long as the pressure slightly gao will burst, won't produce explosion, most of the bad situation is burning. So from the security polymer battery is better than 18650 batteries.

4, low energy density

General 18650 around 2200 mAh battery capacity can be done, so calculate down energy density about 500 wh/L, and the energy density of the polymer battery production at present stage can be close to 600 wh/L.

But polymer battery has its own shortcomings. Mainly the high cost, because can according to customer demand design, here the research and development costs into account. And changeful shape, phyletic and various, cause in the process of manufacturing all kinds of jigs and fixtures are standard parts, and the corresponding increase the cost. Poor universality of polymer battery itself, which is brought by the flexible design, often to 1 mm difference will need to design for the customer.

3, 18650, the application of lithium-ion batteries

Applications in lithium secondary battery energy battery industry due to its superior performance. With the development of lithium secondary battery technology has been widely used in our daily life; Repeated use of rechargeable batteries is more and more get the favour of consumers. Focus on energy battery industry, fully recognize the battery, in turn, let's do it "forms", currently 18650 lithium batteries have certain application in the field below.

1, energy storage

Mainly applied to the base station power supply, clean energy, energy storage, grid power energy storage, domestic optical storage system, etc.

2, power class

Mainly refers to electric vehicles, electric bicycle, new energy vehicles, etc.

3, digital

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

Lithium polymer battery refers to all solid state or gel too for electrolyte of lithium ion battery. 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 thin battery: 3.6 V400mAh capacity, its thickness can be thin to 0.5 mm.

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.

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