Lithium Polymer Battery Cell Balancing

Variations in cell resistance.

Lithium polymer battery cell balancing. Balancing is a term we use to describe the act of equalizing the voltage of each cell in a battery pack. We balance lipo batteries to ensure each cell discharges the same amount. An example of how to bottom balance your lithium battery pack. Balancing li ion li polymer batteries battery balancing circuit many projects are usually carried out with a single battery.

Without the enhancement of cell balancing a conservative design does not allow the soc to approach 100. Designing balancing algorithms and gives examples of successful cell balancings. The energy cell and the power cell. The battery cells are connected in series and all cells are charged with the same current.

Lithium polymer or li po refers to a lithium ion battery that uses a polymer electrolyte instead of a liquid electrolyte. Learn about the difference of energy and power requirements in a battery. What balancing does not do is take care of the 4th one. This has changed and today lithium based systems stand shoulder to shoulder with the robust nickel and lead chemistries.

This enables the construction of pouch cells with different geometries. Its job may be somewhat hindered by the 3rd one. Balancing takes care only of the 1st one. The second reason that you need a lipo compatible charger is balancing.

This helps with the performance of the battery. Equalizing the socs of the various cells in a battery. Cell to cell variations in leakage. The use of cell balancing enables the system engineer to select a battery with larger capacity for an application because balancing allows the battery to achieve a higher state of charge soc.

Means used to perform cell balancing typically include by passing some of the cells during charge and sometimes. Cell balancing is necessary for highly transient lithium battery applications especially those applications where charging occurs frequently such as regenerative braking in electric vehicle ev or hybrid electric vehicle hev applications. An2344 integrates cell balancing and fuel gauge methods into a multi cell battery charger. The application is designed for battery packs with two three or four li ion or li pol cells in a series.

In so doing it compensates also for the 2nd one. Two basic types of li ion have emerged. Introduction different algorithms of cell balancing are often discussed when multiple serial cells are used in a battery pack for particular device.