Abstract: Structurally speaking, the full name of lithium polymer battery should be lithium ion polymer battery. It seems that lithium polymer battery is actually a kind of lithium ion battery. So, is the charging treasure of the polymer good? What are the advantages and disadvantages of polymer charging treasure?
Is lithium ion charging good, or polymer lithium charging treasure better? In fact, it depends on your hobby. Lithium polymer battery is an upgraded product of lithium ion battery. Compared with the current popular lithium ion battery, it has the advantages of large capacity, small size and safety. But the price is also more expensive, to some extent, the polymer lithium charging treasure is better than the lithium ion charging treasure.
Polymer lithium battery advantages
1. The working voltage of the single battery is as high as 3.6v~3.8v, which is much higher than the 1.2V voltage of Ni-MH and Ni-Cd batteries.
2. The capacity density is large, and the capacity density is 1.5~2.5 times of nickel-hydrogen battery or nickel-cadmium battery, or higher.
3. Self-discharge is small, and its capacity loss is small after being placed for a long time.
4, long life, normal use of its cycle life can reach more than 500 times.
5, no memory effect, do not have to empty the remaining power before charging, easy to use.
6, good security performance
The polymer lithium battery is made of aluminum-plastic flexible packaging, which is different from the metal casing of the liquid battery. Once the safety hazard occurs, the liquid battery is easy to explode, and the polymer battery can only be air-blasted at most.
7, the thickness is small, can be made thinner
Ultra-thin, the battery can be assembled into a credit card. Ordinary liquid lithium battery adopts the method of customizing the outer casing and plugging the positive and negative materials. The thickness is 3.6mm or less. There is a technical bottleneck. The polymer battery core does not have this problem. The thickness can be less than 1mm, which is in line with the current demand of mobile phones. .
8, light weight
A battery using a polymer electrolyte does not require a metal shell as a protective outer package. The weight of the polymer battery is 40% lighter than the steel shell lithium battery of the same capacity specification, which is 20% lighter than the aluminum shell battery.
9, large capacity
The polymer battery has a capacity of 10-15% higher than that of the same size steel shell battery, which is 5-10% higher than that of the aluminum shell battery. It is the first choice for color screen mobile phones and MMS mobile phones. Nowadays, the new color screen and MMS mobile phones on the market are mostly used. Polymer batteries.
10. Small internal resistance
The internal resistance of the polymer battery core is smaller than that of the general liquid battery. At present, the internal resistance of the domestic polymer battery core can even be less than 35mΩ, which greatly reduces the self-consumption of the battery and prolongs the standby time of the mobile phone. The level of integration with the international. This polymer lithium battery that supports large discharge currents is an ideal choice for remote control models and is the most promising alternative to nickel-metal hydride batteries.
11, the shape can be customized
Manufacturers are not limited to standard shapes and can be economically made to the right size. Polymer batteries can increase or decrease the thickness of batteries according to customers' needs. Develop new battery models, which are cheap, open cycle is short, and some can even be customized according to the shape of mobile phones to make full use of battery casing space and upgrade batteries. capacity.
12, good discharge characteristics
The polymer battery uses a colloidal electrolyte, which has a smooth discharge characteristic and a higher discharge platform than a liquid electrolyte.
13, the protection board is simple in design
Due to the use of polymer materials, the battery core does not ignite or explode, and the battery core itself has sufficient safety. Therefore, the protective circuit design of the polymer battery can be omitted by omitting the PTC and the fuse, thereby saving battery cost.
Lithium battery
1. Lithium primary batteries have poor safety and there is a danger of explosion.
2. The lithium ion battery of lithium cobalt oxide cannot discharge at a large current and has poor safety.
3. Lithium-ion batteries need to protect the line to prevent the battery from being overcharged and discharged.
In appearance, most of the mobile power products currently on the market use a cylindrical (ie 18650) lithium ion battery or a block lithium polymer battery. Therefore, when we select the mobile power supply, if the product packaging does not specifically indicate the type of battery used, then simply by the thickness of the product itself, a general understanding of the type of battery used inside.
It can be said that after years of development, the technology of lithium-ion batteries is relatively mature, and the mass production has made its manufacturing cost very low. Therefore, lithium-ion batteries are more advantageous in price than lithium polymer batteries. This is why it is used in most laptops and other devices.
Since lithium ions using a liquid electrolyte will increase their internal pressure in the case of overcharging (overcharging), in order to avoid explosion of the sealed metal casing, the 18650 battery is usually equipped with a safety at the top. Valve, when the internal pressure of the battery is too large, the top safety valve will automatically pop out to play the role of decompression. However, when the safety valve is ejected, the lithium ions leaking inside the battery may still be ignited due to contact with oxygen in the air.
Compared with lithium ion batteries using liquid electrolytes, lithium polymer batteries using solid polymer electrolytes are ultra-thin in shape, with a theoretical minimum thickness of 0.5 mm, and any shape and arbitrary area. . The battery styling flexibility is greatly improved, so that a new generation of lithium batteries of any shape and capacity can be better formed.
For the lithium-ion battery and lithium polymer battery that we often say, both have their own advantages and disadvantages. If the price/performance ratio of the product is more biased, the 18650 battery is chosen. If it is more biased towards the appearance and volume of the mobile power supply, Then a slightly more expensive lithium polymer battery is the first choice.