PM511V08 3BSE011180R1 | ABB | Measure the instantaneous voltage drop of the battery

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PM511V08 3BSE011180R1 | ABB | Measure the instantaneous voltage drop of the battery

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The direct current discharge method is to measure the instantaneous voltage drop on the battery by discharging a large current instantly. PM511V08 3BSE011180R1 calculates the internal resistance of the battery through Ohm’s law. Although this method has also been widely applied in practice, it also has some drawbacks. If this method is used to detect the internal resistance of batteries, it must be carried out in a static or offline state, and online measurement cannot be achieved. Moreover, high current discharge can cause significant damage to the battery, thereby affecting its capacity and lifespan.

The communication method measures the voltage response signal Vo and phase difference between the two terminals of the battery by injecting a constant AC current signal IS, PM511V08 3BSE011180R1 into the battery θ According to the impedance formula

To determine the internal resistance R of the battery. This method does not require discharging the battery and can achieve safe online detection of battery internal resistance, so it will not affect the performance of the battery. But this method requires measuring the AC current signal Is, voltage response signal Vo, and the phase difference between voltage and current θ It can be seen that this method not only has multiple interference factors, but also increases the complexity of the system and affects the measurement accuracy.

In order to address the shortcomings of the above methods, this article adopts a four terminal measurement method. PM511V08 3BSE011180R1 multiplies the voltage response signal at both ends of the battery with a sine signal that generates a constant AC source through an AC differential circuit and an analog multiplier. Then, the output voltage signal of the analog multiplier is filtered to convert the AC signal into a DC signal. The DC signal is amplified by a DC amplifier and converted into an analog-to-digital converter, and the converted value is sent to the microcontroller for simple processing.

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