Polymer lithium ion battery is a kind of lithium ion battery, but compared with liquid lithium ion battery (Li-ion), it has high energy density, more compact, ultra-thin, light weight, high safety and low cost Many obvious advantages are a new type of battery. Below we detail the advantages and disadvantages of polymer lithium-ion batteries:
Polymer lithium ion batteries advantages:
1. Good safety performance
The polymer lithium-ion battery adopts aluminum-plastic flexible packaging in its structure, which is different from the metal shell of the liquid cell. Once a safety hazard occurs, the liquid cell is easy to explode, and the polymer cell is only flat.
2. Small thickness, can be made thinner
Ultra-thin batteries can be assembled into credit cards. Ordinary liquid lithium-ion battery adopts the manufacturing method of first customizing the shell and then plugging the positive and negative electrode materials. There is a technical bottleneck if we want make the thickness below 3.6mm. The polymer battery does not have this problem. The thickness can be below 1mm, which is in line with the current the demand direction of various electrical equipment.
3. 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 that of the steel battery with the same capacity and 20% lighter than the aluminum battery.
4. Large capacity
The capacity of the polymer battery is 10-15% higher than that of the steel case battery of the same size and specification, and 5-10% higher than that of the aluminum case battery. It has become the first choice for various types of electrical equipment. Most electronic devices on the market now also use polymer li-ion batteries cells.
5. Small internal resistance
The internal resistance of the polymer cell is smaller than that of the general liquid cell. At present, the internal resistance of the domestic polymer cell can even be less than 35mΩ, which greatly reduces the self-consumption of the battery and extends the standby time of electronic equipment Level with international standards.
6. Shape can be customized
The manufacturer does not need to be limited to the standard shape, and can freely make the appropriate size. The polymer battery can add or reduce the thickness of the battery cell according to the customer's needs, develop new battery cell models, the price is cheap, the mold opening cycle is short, and some can even be tailored according to the shape of the electronic device, to make full use of the battery case space to increase battery capacity.
7. Good discharge characteristics
Polymer batteries use colloidal electrolytes. Compared with liquid electrolytes, colloidal electrolytes have smooth discharge characteristics and higher discharge platforms.
8. Simple design of protection board
Because of the use of polymer materials, the battery cell does not catch fire or explode, and the battery cell itself has sufficient safety. Therefore, the protection circuit design of the polymer battery may consider omitting pTC and fuses, thereby saving battery costs.
Polymer lithium ion batteries disadvantages:
1. Compared with lithium ion batteries, the energy density and cycle times of polymer lithium batteries are reduced.
2. It is expensive to manufacture. Since there is no standard form factor, most polymer batteries are specially customized according to customer needs, so compared with lithium-ion batteries, the manufacturing cost will be relatively expensive.
