The so-called lithium polymer battery is a name for hard shell batteries compared with cylindrical and square batteries. Its internal composition (positive electrode, negative electrode, diaphragm and electrolyte) is not different from square and cylindrical lithium batteries. The biggest difference is that lithium polymer battery uses aluminum-plastic composite film as the shell, while square and cylindrical batteries use metal materials as the shell.
1. Good safety: lithium polymer battery is packaged with aluminum-plastic film in structure. When thermal management is out of control or puncture occurs, its soft package will provide buffer space for the cell, swell and deform, and eventually catch fire or smoke, but there will be no explosion.
2. Light weight and high energy density: the weight of lithium polymer battery is 40% lighter than that of steel shell battery with the same capacity and 20% lighter than that of aluminum shell battery. Therefore, it usually has high energy density. At present, most battery enterprises in China that have broken through the energy density of 300wh / kg adopt lithium polymer battery.
3. Good electrochemical performance and long service life: lithium polymer battery has small internal resistance, which can greatly reduce the self power consumption of the battery; In addition, lithium polymer battery has a longer cycle life.
Similarly, lithium polymer battery also has some shortcomings, that is, the product consistency is poor, the cost is high, liquid leakage and flatulence are easy to occur, and additional shells are required in the group process, and the pack process is highly complex.
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