Advantages and disadvantages of polymer lithium batteries

Polymer lithium battery is a kind of lithium ion battery, but compared with liquid lithium battery (Li-ion), it has high energy density, smaller size, ultra-thin, lightweight, and high safety and low cost. The obvious advantage is a new type of battery. Below we introduce in detail the advantages and disadvantages of polymer lithium batteries.

　　 Advantages:

　　1. Good safety performance

　　The polymer lithium battery adopts aluminum-plastic soft 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, and the polymer battery can only blow up.

　　 2. Small thickness, can be made thinner

　　 Ultra-thin, the battery can be assembled into a credit card. Ordinary liquid lithium batteries use the method of customizing the shell first, and then plugging the positive and negative materials. The thickness of the battery is below 3.6mm and there is a technical bottleneck. The polymer cell does not have this problem, and the thickness can be below 1mm, which meets the needs of current mobile phones. direction.

　　3. Lightweight

　　The battery using polymer electrolyte does not need a metal shell as a protective outer packaging. The weight of the polymer battery is 40% lighter than the steel shell lithium battery of the same capacity specification, and 20% lighter than the aluminum shell battery.

　　4. Large capacity

Polymer batteries have a capacity of 10-15% higher than steel shell batteries of the same size and 5-10% higher than aluminum shell batteries. They have become the first choice for color screen mobile phones and MMS mobile phones. Nowadays, most of the new color screen and MMS mobile phones on the market are also used Polymer batteries.

　　 5. Small internal resistance

The internal resistance of polymer batteries is smaller than that of ordinary liquid batteries. At present, the internal resistance of domestic polymer batteries can even be below 35mΩ, which greatly reduces the self-consumption of the battery and prolongs the standby time of the mobile phone. Level in line with international standards. This kind of 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 Ni-MH batteries.

　　6. The shape can be customized

　　 The manufacturer is not limited to the standard shape, it can be economically made into a suitable size. The polymer battery can increase or decrease the thickness of the battery cell according to the needs of customers, and develop new battery cell models, which are cheap and short in mold opening cycle. Some can even be tailored to the shape of the mobile phone to make full use of the battery shell space and improve the battery. capacity.

　　7. Good discharge characteristics

　　 polymer battery adopts gel electrolyte, which has stable discharge characteristics and higher discharge platform compared with liquid electrolyte.

　　 8. The protection board design is simple

　　Because of the polymer material, 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 can be considered to omit the PTC and fuse to save the battery cost.

　　 Disadvantages:

　　 Compared with lithium ion batteries, the energy density and the number of cycles have decreased.

　　 Expensive to manufacture.

　　 There is no standard shape, and most batteries are manufactured for the high-capacity consumer market.

　　 Compared with lithium ion batteries, the price and energy are higher.