What Is The Difference Between 18650 and Li-polymer Battery?

By February 17, 2016

18650-and-li-Polymer-Battery

With the popularity of all kinds of smart devices, more and more people especially the mobile phone’s own power, have been unable to meet our need for battery life in everyday use, So if we want solved the problem for the consumers who haven’t had any contact with mobile power supply, we need know what power bank is made of ? and how to choose the power bank  or good quality power banks?

The power bank is good or not relies largely on the battery cell. It is just like the car fuel tank and drive system, being responsible for the entire mobile power and providing a steady stream of power, and directly determines the quality of mobile power bank. Mobile power supply circuit board can be treated as a control system, which is mainly responsible for power distribution and transformation. It converts the voltage provided by lithium batteries into the standard voltage to provide electricity for charging device.

 

18650 -lithium-ion battery-01 18650 -lithium-ion battery-02 18650 -lithium-ion battery-03 18650 -lithium-ion battery-04

 

18650 battery also called lithium-ion batteries. As is commonly known by everyone, the lithium cobalt oxide is the liquid lithium ion battery, of which the common type is 18650 and square shapes. 18650 battery is 18 mm in diameter and 65 mm in height, widely used as laptop batteries. On account of being used universally with laptop battery, more than sixty percent of the mobile power uses 18650 batteries in today’s market. It has a wide range of application and portable size, the techniques are matured increasingly. More about 18650 battery click Here.

Lithium iron phosphate can be called scientifically as ferroelectric. Compared with other batteries, the biggest difference is the addition of iron element in the positive pole of the battery. Lithium iron phosphate is still in its infancy in recent years and it is a kind of potential material, its safety performance and cycle life is unmatched by other materials, and these are also the most important technology index of power battery. Lithium iron phosphate is non-toxic, good in safety performance and of no pollution. It has multiple sources for raw material and long service life, what more, the price is cheap. It is the ideal of anode material in a new generation of lithium ion battery.

 

li-Polymer-Battery-01 li-Polymer-Battery-02 li-Polymer-Battery-03 li-Polymer-Battery-04

 

Li-Polymer battery are made of soft aluminum-plastics compound packaging .Internal is half solid polymers.Discharge stability, high efficiency, the internal resistance small.safety performance is better, and has overcurrent, overvoltage protection devices. Cycle life is more than 500 times. More about Li-Polymer battery click Here.

There are no protection circuit in 18650 Li-ion battery, that is the biggest difference with Li-Polymer battery. As long as 18650 Li-ion battery power bank used equal brand and the same capacity (such as Sanyo, Samsung or Panasonic), the battery life is not too much difference. The protection circuit is designed in power bank shell, so need put power security design of power bank in place.
In a word, each battery has their advantages and disadvantages. Li-Polymer batteries’ safety performance is better, of course its price is higher than 18650 li-ion battery in the same capacity. 18650 li-ion battery capacity can be higher than Li-polymer battery, if its protection circuit is designed perfect, the 18650 Li-ion battery power bank also is a high cost-effective choice.

 

The structure, the lithium polymer battery ‘s full name should be lithium-ion polymer battery , so it seems , is actually a lithium polymer battery lithium ion battery . The biggest difference between the two is only used within the type of electrolyte , a lithium -ion battery is a liquid electrolyte , and lithium ion polymer batteries instead places the solid polymer electrolyte , the polymer may be a solid,  can be is a semi-solid ( gel ) is .

 

The appearance, the majority of currently available mobile power are sold using a cylindrical ( ie 18650 ) lithium-ion battery or two batteries lithium polymer block . So when we pick mobile power , especially if the product packaging does not indicate the type of batteries used , then you can simply by the thickness of the product itself to be a general understanding of the use of its internal battery type.

 

Related:

Best 18650 Battery

A Brief History of Power Bank

Difference Between Original Battery and Mobile Power Bank

 

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  1. What is the difference between two cells Li-ion 18650 and li-ion 31865

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