Lithium Ion Polymer Cell Voltage

Citation needed design origin and terminology.

Lithium ion polymer cell voltage.

Li polymer battery are made of soft aluminum plastics compound packaging internal is half solid polymers discharge stability high efficiency the internal resistance small safety performance is better and has. Lithium polymer cells have evolved from lithium ion and. 1 do not short circuit and do not overcharge lithium ion polymer cells. After that other packaging forms evolved including the flat pouch format.

Lithium ion polymer has its market niche in wafer thin geometries like batteries used in credit cards coupled with other similar applications. 3 the lithium polymer battery should be charged in a safe manner and never overcharged or overdischarged. The nominal voltage of normal voltage cells is at 3 6 3 7v while the nominal voltage of high voltage cells is at 3 8v or 3 85v. Lithium ion polymer lipo battery cells with normal voltages are fully charged at 4 2v while high voltage cells are at 4 35v.

The drawbacks are the need for protection circuits to prevent abuse as well as high price. This offers a marketing advantage because the higher voltage boosts the watt hours on paper voltage multiplied by current equals watts. If you take a look at your laptop battery you will see that it offers 11 1v which is equivalent to 3 7v. The lithium ion cells offer a nominal voltage that is pegged at 3 7 volts.

Lipo cells follow the history of lithium ion and lithium metal cells which underwent extensive research during the 1980s reaching a significant milestone with sony s first commercial cylindrical li ion cell in 1991. Lithium ion cells are susceptible to stress by voltage ranges outside of safe ones between 2 5 and 3 65 4 1 4 2 or 4 35v depending on the components of the cell. As the battery is used the voltage will drop lower and lower until the minimum which is around 3 0v. The cells use for electric bike bicycle tools solar project don t use for ev system.

For example almost all lithium polymer batteries are 3 7v or 4 2v batteries. What this means is that the maximum voltage of the cell is 4 2v and that the nominal average voltage is 3 7v. The nominal voltage of lithium ion is 3 60v cell. 4 do not try to solder directly to lithium polymer batteries.

Types of lithium ion batteries. 100 original lg chem n2 1 3 7v 60ah polymer lipo lithium ion battery cell. Exceeding this voltage range results in premature aging and in safety risks due to the reactive components in the cells. Some cell manufacturers mark their li ion as 3 70v cell or higher.

2 do not over discharge dent crush or burn the lithium polymer cells.