Do you know the types of lithium battery cells?

18650 is generally packaged in steel, that is, 18650 lithium ions are in a liquid state, just like a cup filled with water. Therefore, the 18650 can only be cylindrical. If you buy a mobile power supply thick and large, it basically is 18650 batteries.

Due to the particularity of the 18650 package (with steel shell), if the quality of the products produced is not enough, the biggest danger is the explosion. The explosion caused by the notebook in previous years is because of Sony's laptop battery (usually using 18650). There is a problem with quality control.

Lithium polymer batteries, the raw materials are generally mixed with lithium cobalt oxide, lithium manganate, and ternary lithium. Through a certain proportion of the three mixtures, a certain process is used to make the outer packaging mainly using aluminum plastic film, and the lithium material in the middle is paste. So the shape can be customized. At the same time, you can make ultra-thin batteries, such as ultra-thin batteries such as 0.33mm and 0.50mm.

The outer surface of the polymer battery is made of a layer of aluminum plastic film, and a layer of high-temperature adhesive tape is applied outside. The maximum safety of the polymer is that it leaks, short circuit, and causes the package to rise. The worst case is the burning and the flame.

Therefore, compared with the 18650, the polymer battery is safer. However, burning also poses a safety hazard, so users who use mobile power are advised not to put the mobile power on the pillows, these places on the bed.

Lithium iron phosphate and lithium manganate are commonly available in the market of 18650. There are also ternary ones. Let's talk about ternary ones briefly. Ternary material 18650 price is moderate 1800mAh market The price is about 7 Yuan, the nominal voltage is 3.8V, the maximum voltage can reach 4.2V when used, the low voltage can reach 2.5V, there is no memory effect, the field of using D is also relatively wide, the domestic technical level Also ok, support for domestic. The polymer battery I have seen is mainly soft bag, power type and capacity type, the material is similar to 18650, only 18650 is stainless steel case, the polymer is aluminum plastic film case, used for industrial, transportation.

Of course, the polymer battery is better! It is also a kind of lithium ion battery, but it has higher energy density and high safety than liquid lithium battery (Li-ion).

Accurate should be said: lithium polymer batteries; Lithium-ion batteries can be divided into liquid lithium-ion batteries and polymer lithium-ion batteries according to the different electrolyte materials used in lithium-ion batteries. So the "lithium ion battery" written in the manual is also correct.

Polymer batteries are actually one of the lithium-ion batteries. Today's polymer batteries are generally based on lithium-nickel-cobalt-manganese ternary materials. You may want to use polymer batteries and 18650 series cylindrical lithium-ion batteries. Contrast, their materials, voltage, discharge platform, etc. are similar, there are lithium cobalt oxide and ternary series, but one uses aluminum composite film soft package process, one is steel shell package, polymer Usually used alone, such as mobile phone batteries, digital camera batteries, etc., and 18650 batteries are mostly used for series and parallel battery packs. The above is for reference only!

It refers to a single positive and negative electrode electrochemical cell, generally not directly used. Unlike batteries which contain protective circuits and enclosures, they can be used directly.

The composition of the lithium ion secondary rechargeable battery is such that the cell + protection circuit board. The rechargeable battery removal protection board is the battery. He is the power storage part of the rechargeable battery. The quality of the battery directly determines the quality of the rechargeable battery.

The mobile phone board removes the outer casing, and then removes the protective circuit board in the electric board to leave the lithium battery.

The battery core is divided into aluminum shell battery core, soft battery core (also known as "polymer battery core"), and cylindrical battery core. Generally, the mobile phone battery adopts an aluminum-clad battery core, and digital products such as Bluetooth adopt a soft-package battery core, and the battery of the notebook computer adopts a series-parallel combination of cylindrical batteries.

The particle size is small, the specific surface area is large, the color is white, the purity is high, and the electrochemical performance is obviously improved. It can be used in lithium titanate battery materials and lithium cobalt oxide battery materials. 1: Typical Faraday tantalum capacitance behavior is exhibited in the potential range of -0.05 to 0.35 V (vsSCE). The so-called tantalum capacitor is developed after the electric double layer capacitor. The tantalum capacitor is also called the Faraday quasi-capacitor. For the Faraday quasi-capacitor, the process of storing the charge includes not only the storage on the electric double layer, but also the ion in the electrolyte in the electrode active material to store the charge in the electrode due to the redox reaction. The ions in the electrolyte, generally H or OH-, diffuse from the solution to the electrode/solution interface under the action of an applied electric field, and then enter the bulk phase of the electrode surface active oxide through the electrochemical reaction at the interface; The material is an oxide having a large specific surface area, so that a considerable amount of such an electrochemical reaction occurs, and a large amount of charge is stored in the electrode. During the discharge, these ions entering the oxide will return to the electrolyte again, and the stored charge will be released through the external circuit, which is the charging and discharging mechanism of the Faraday quasi-capacitor. To explain clearly, tantalum capacitor is an infinite number of small electric double layer capacitors. 2: Increase the specific capacity (method/gram) at the same current density (MA/cm 2 ). 3: Reduce the self-discharge rate and have a good cycle life. Composition: Nano titanium dioxide (XZ-TI01) Appearance: white powder; PH value: 6-8; Particle size: 10 nm; Specific surface area: 60-70 m2/g; Purity: 99.9%, drying weight loss 105 ° C, 2 h ≤ 0.05 (%); loss on ignition ≤ 0.1 (%); iron ppm ≤ 3 qualified lead (Pb) ppm ≤ 10 qualified. Packing: 10 kg / paper drum lined with plastic film bag

The main advantages and disadvantages of polymer batteries: (1) the diversity of the appearance of the production, while the product with 18650 battery is thick and large, and the shape of the millennium. (2) Long service life. There is no problem with charging and discharging more than 500 times. (3) High security of use, mostly used in high-end products. The safety of polymer batteries is reflected in the absence of explosions, and only bulging, spontaneous combustion, etc. may occur. (4) The disadvantage is that the cost is high, and the polymer battery of the same capacity is at least 100% more expensive than the 18650 lithium ion battery. Advantages and Disadvantages of 18650 Battery: At present, the technology of 18650battery is mature, its battery structure is stable, its specific capacity is high, and its comprehensive performance is outstanding. Because of its compact size, it can be used in many areas. However, its safety is worse than that of polymer lithium battery, and the number of cycles of the cells is low, about 300 times.

18650 batteries

The 18650 lithium battery means that the battery has a diameter of 18 mm and a length of 65 mm, and 0 represents a cylindrical battery. The 18650 battery technology is relatively mature, the battery structure is stable, the specific capacity is high, the comprehensive performance is outstanding, and because of its small size, it can be used in many ranges. The disadvantage is that its safety is worse than that of polymer lithium batteries, and the number of cycles of the cells is relatively low, about 300 times.

Polymer batteries

The difference between a polymer battery and a conventional lithium ion battery lies in the production process. The lithium battery is entangled and has a soft volume. The polymer is superimposed and has a hard body shape. For the same volume of polymer and lithium batteries, the polymer has a larger capacity, about 30% higher. And it is safer and the risk of explosion is small, long lasting. Charge and discharge reached more than 500 times. The disadvantage is that the cost is high, and the same capacity of the polymer cell is at least 100% more expensive than the 18650 lithium ion battery.

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