PM866K01 3BSE050198R1 | ABB | Principle of battery internal resistance detection

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PM866K01 3BSE050198R1 | ABB | Principle of battery internal resistance detection

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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.

Due to the milliohm internal resistance of the battery, PM866K01 3BSE050198R1 has a large measurement error using the conventional two terminal measurement method. Therefore, a four terminal measurement method is adopted here. During measurement, a constant AC excitation current signal with a frequency of 1.0kHz ± 0.1kHz is applied to two terminals, and the other two terminals are used for measurement. The measurement working principle diagram is shown in Figure 1, and the response signal refers to the AC voltage signal measured at both ends of the battery after injecting an AC constant current source. The sine signal is an input signal generated by D/A as a voltage controlled constant current source.

In the above equation, K, A, and I are all known quantities, while u is the sampled value sent to the microcontroller for processing through A/D sampling. Therefore, performing a simple division operation in the microcontroller can obtain the internal resistance of the battery.

The prerequisite for successfully detecting the battery status is to provide the required AC constant current source. PM866K01 3BSE050198R1 constant current source is a power supply device that can provide a constant current to the load. It is a power supply with a very high internal resistance. In order to ensure high measurement accuracy and good reproducibility of internal resistance, it is required that the constant current source has sufficient stability and low waveform distortion. The required AC signal amplitude here is 40mV and frequency is 1KHZ.

However, there are many shortcomings in the design of traditional low-frequency AC signal generators: PM866K01 3BSE050198R1 is used in general-purpose circuits, with many components, especially large capacitors, poor waveform stability, large distortion, and extremely inconvenient adjustment; Application specific circuits, such as ICL8038, MAX038, etc., have significantly improved distortion and stability, but are not suitable for low-frequency applications, inconvenient to adjust, and have higher costs.

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