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3. Security aspect
The current polymers are mostly soft pack batteries, using aluminum-plastic film as the outer shell. When organic electrolytes are used internally, even if the liquid is very hot, it will not explode because aluminum-plastic film polymer batteries are solid or colloidal and have no leakage, only natural rupture. But nothing is absolute. If the instantaneous current is large enough and a short circuit occurs, it is not impossible for the battery to self ignite or burst. The occurrence of safety accidents in mobile phones and tablets is often caused by this situation.
4. Cell voltage
Due to the use of polymer materials in mobile phone polymer lithium-ion batteries, multiple layers can be combined in the battery cells to achieve high voltage. The nominal capacity of lithium-ion battery cells is 3.6V. To achieve high voltage in practical use, multiple cells need to be connected in series to form an ideal high voltage working platform.
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