The polymer lithium battery is developed on the basis of the liquid lithium ion battery. Its positive electrode and negative electrode materials are the same as the liquid lithium ion battery, but it uses gel electrolyte and aluminum plastic film as the outer packaging, so it has a lighter weight. Thinner, higher energy density and safety features are widely favored by domestic and foreign customers.
Generally speaking, polymer lithium batteries refer to lithium batteries with soft-wrapped aluminum film outer packaging. Steel-shell batteries or square aluminum-shell lithium batteries such as 18650 lithium batteries are not included. From its invention to the present, polymer lithium batteries have included three types of low-temperature lithium batteries, high-rate lithium batteries and medium-high temperature lithium batteries.
How long is the life of a polymer lithium battery?
Lithium-ion batteries are divided into two types: polymer lithium-ion batteries and liquid lithium-ion batteries. The positive and negative materials of the polymer lithium-ion battery and the liquid lithium-ion battery are the same, and the working principle of the battery is similar, but the electrolytes are different from each other. The polymer lithium battery is lightweight, has strong energy storage capacity, good discharge performance and can be made into various shapes and has a long life.
Under the international unified standard, the life of the battery is not represented by time, but by the number of cycles, that is, it is counted once after the complete discharge. The general lithium battery is between 500 and 800 times, and the A-grade polymer battery can be used. up to 800 times. Therefore, the quality of the battery of the selected battery supplier will be guaranteed, and the service life will be longer.
Polymer battery life has a great relationship with its performance. Polymer lithium batteries are also called polymer batteries. From the perspective of appearance, polymer batteries are packaged in aluminum-plastic shells, which are different from the metal shells of liquid lithium batteries. The reason why the aluminum-plastic case can be used is that the polymer battery uses some colloidal substances to help the battery plate fit or absorb the electrolyte, thereby greatly reducing the amount of liquid electrolyte used.
The structural improvement makes the polymer battery have the advantages of high energy density, more miniaturization and ultra-thinness. Compared with liquid lithium batteries, polymer batteries have a longer life, at least 500 cycles. In addition, if the polymer lithium battery is not charged for a long time, the lifespan will also decrease. Lithium polymer batteries need to keep their electrons flowing for a long time to reach their ideal lifespan.
The life of lithium polymer battery is different in theory and use, but the structural characteristics determine that the life of polymer battery has great advantages over traditional batteries. According to the factors affecting the life of polymer battery in practice, it can be charged from shallow to shallow. , reasonable voltage, suitable storage temperature to extend the life of polymer lithium batteries.
At present, the market price of polymer lithium-ion batteries is higher than that of liquid lithium-ion batteries. Compared with liquid lithium-ion batteries, its lifespan is long and its safety performance is good. It is believed that there will be a lot of room for improvement in the near future.
Lithium polymer battery advantages
The polymer lithium-ion battery is not only safe, but also has the advantages of thinning, arbitrary area and arbitrary shape, and the shell also uses a lighter aluminum-plastic composite film. However, its low-temperature discharge performance may still have room for improvement.
It has good safety performance. The polymer lithium battery adopts aluminum-plastic flexible packaging in structure, which is different from the metal shell of the liquid battery. Once a safety hazard occurs, the liquid battery is easy to explode, while the polymer battery will only bulge at most.
The thickness is small and can be made thinner. The ordinary liquid lithium battery adopts the method of customizing the casing first, and then plugging the positive and negative electrode materials. There is a technical bottleneck when the thickness is less than 3.6mm, but the polymer battery does not have this problem, and the thickness can be adjusted. Below 1mm, which is in line with the current demand for mobile phones.
Light weight, the polymer lithium battery is 40% lighter than the steel shell lithium battery with the same capacity specification, and 20% lighter than the aluminum shell battery.
Large capacity, the polymer battery has a capacity of 10-15% higher than that of a steel-shell battery of the same size, and 5-10% higher than an aluminum-shell battery, making it the first choice for color screen mobile phones and MMS mobile phones. Polymer batteries are also mostly used.
The internal resistance is small, and the internal resistance of the polymer battery is smaller than that of the general liquid battery. At present, the internal resistance of the domestic polymer battery can even be below 35mΩ, which greatly reduces the self-consumption of the battery and prolongs the standby time of the mobile phone. , can fully reach the level of international standards. This polymer lithium battery that supports large discharge current is an ideal choice for remote control models, and has become the most promising product to replace nickel-metal hydride batteries.
The shape can be customized, the polymer lithium battery can increase or decrease the thickness of the battery cell according to the needs of customers, 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 mobile phone to make full use of the battery Shell space, increase battery capacity.
As a kind of lithium battery, polymer mainly has the advantages of high density, miniaturization, ultra-thinness and light weight compared with liquid lithium battery. At the same time, polymer lithium battery also has obvious advantages in safety and cost utilization. The advantage is a new energy battery generally recognized by the industry.
Post time: Mar-02-2022