Open Circuit Voltage Testing
Open circuit voltage (OCV) testing is a technique to assess the health of an energy storage device, such as batteries. OCV measures the voltage of the DUT (in this case, a
Therefore, extracting and analyzing the OCV of a battery is an accessible and preferred way to investigate the state of a battery in operation. The open-circuit voltage (OCV) curve is the voltage of a battery as a function of the state of charge when no external current is flowing and all chemical reactions inside of the battery are relaxed.
An alternative option, which does not require specific hardware, is analyzing the open-circuit voltage (OCV) curve of batteries. To calculate the OCV, sensors measuring the voltage, current, and temperature of each battery cell are sufficient. These values are already tracked by the battery's inbuilt battery management system (BMS).
By contrast, when the battery is engaged in valley filling at night, the battery discharges, and the OCV is close to the main discharge hysteresis voltage curve. Therefore, the OCV of the battery varies circularly under this operating condition.
On production lines that manufacture cells for lithium-ion batteries, OCV testing plays a key role in detecting defects. OCV is a battery's voltage when it is not connected to any load.
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