Figure 1’s voltmeter measures a single cell battery. Beyond the obvious, the arrangement works because there are no voltages in the measurement path other than the measur-and. The ground referred voltmeter only encounters the voltage to be measured. Figure 2’s “stack” of series connected cells is more complex and presents problems.
For measuring the total module voltage and current, a Scienlab SL/80/100/8BT6C battery tester was used. The individual cell voltages were measured via a Scienlab SL/U/MCM16C, with the measurement tabs being located on the respective cell connectors interconnecting the parallel cell groups.
A difference in cell voltages is a most typical manifestation of unbalance, which is attempted to be corrected either instantaneously or gradually through by-passing cells with higher voltage. However, the underlying reasons for voltage differences on the level of battery chemistry and discharge kinetics are not widely understood.
Difference of cell voltages is a most typical manifestation of unbalance, which is attempted to be corrected either instantaneously or gradually through by-passing cells with higher voltage. However, the underlying reasons for voltage differences on the level of battery chemistry and discharge kinetics are not widely understood.
Voltmeter Measuring Ground Referred Single Cell is Not Subjected to Common Mode Voltage volts in a large series connected battery stack such as is used in an automobile. Such high voltage operation is beyond the voltage breakdown capabilities of most prac-tical semiconductor components, particularly if accurate measurement is required.
In addition to individual cells’ capacity utilization and individual cells’ energy utilization, individual cells’ terminal voltage is also an important indicator of the battery pack’s performance. The operating condition is set to discharge the single cell at a 1C rate and reaches the single cell’s discharge cutoff voltage.