The "soft package" in lithium polymer battery actually refers to a layer of polymer shell on the lithium battery, which is mainly packaged with aluminum-plastic film. In fact, lithium polymer battery is another name for polymer lithium battery, and lithium polymer battery mainly has the following advantages:
1. Good safety performance: the soft packed battery will not have an explosion accident like the steel shell and aluminum shell. Generally, in the case of potential safety hazards, the shell will only blow up and crack at most.
2. Small size, light weight and high energy: in terms of weight, the soft pack battery is 40% lighter than the steel shell lithium battery with the same capacity and 20% lighter than the aluminum shell battery. In terms of capacity, lithium polymer battery is 10 ~ 15% higher than the steel shell battery with the same specification and size, and 5 ~ 10% higher than the aluminum shell battery.
3. Small internal resistance: we all know that the lithium battery itself will have an inevitable self discharge reaction, and the greater the internal resistance, the stronger the self discharge. Relatively speaking, the internal resistance of lithium polymer battery is small, which greatly reduces the self power consumption of the battery.
4. Flexible design: the shape of the soft pack battery can be determined by the specific market demand. It can be customized according to the specific size of the battery box, or through a variety of battery layout methods to make full use of the internal space of the battery box and meet the differentiated needs.
It is understood that the main application fields of lithium polymer battery can be subdivided into 3C field, power field and energy storage field. The application of soft pack battery is first in the 3C field. In recent years, especially in notebook computers, mobile phone batteries and other supplies, it accounts for more than 60%. Meanwhile, with the continuous development of new energy vehicles, the market penetration of soft pack lithium batteries is also increasing. The energy storage market is an emerging field of lithium battery application. There are few soft packs for short-term application. In the future, with the decline of soft pack cost, this field also has great growth potential.
In addition, the biggest difference between lithium polymer battery and other batteries lies in the soft package material and the use of aluminum-plastic composite film, which is also the most critical and technically difficult material in lithium polymer battery.
At present, there are still few models of soft pack cells in the market, and the R & D cost is generally high. Some insiders pointed out that the main reason for the continuous expansion of the market share of soft pack batteries is that with the maturity of technology, the advantages of soft pack batteries in safety, specific energy, cycle life and flexible design have gradually become prominent, especially the ternary soft pack batteries have made great progress in energy density.
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