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The 18650 battery cells are cylindrical and generally packaged in steel shells. Because the lithium ions in 18650 are in a liquid state, just like a cup filled with water, 18650 can only be cylindrical.

The danger of 18650 is still relatively high, because the packaging of 18650 is generally made of steel shell, with PVC film covering the outer shell. The entire outer body of the steel shell is the negative electrode. If the outer film is damaged, it is easy to cause a short circuit, which can cause a sudden increase in the internal temperature of the battery cell, Nowadays, all 18650 batteries have safety valves (such as 18650 batteries without safety valves, do not choose batteries without safety valves). When the temperature rises, the safety valve will open to discharge the heat inside the battery. Discharging heat can easily cause a fire, so when choosing a battery cell, be sure to check whether the outer membrane is intact and undamaged. And some battery cell manufacturers have substandard production processes, which greatly compromise battery life and safety. Therefore, when choosing battery cells, it is necessary to check whether the manufacturer has specifications, safety certification certificates, and various testing reports.

3) Lithium polymer battery cells

Lithium polymer battery cells are generally made from a mixture of lithium cobalt oxide, lithium manganese oxide, and ternary lithium. Made through a certain proportion of the mixture of the three, using a certain process, the outer packaging is mainly made of aluminum-plastic film, and the lithium material in the middle is a paste. The shape can be customized as desired.

The biggest safety issue with lithium polymer battery cells is the occurrence of bulging caused by liquid leakage and short circuits, which can lead to combustion and flames in severe cases.

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