Non-model-based battery internal short-circuit detection device and method thereof

Non-model-based diagnostic device for quantitative detection of internal short circuits using energy change analysis

This technology quantitatively calculates internal short-circuit current and resistance without battery modeling by utilizing cell energy changes between two points where specific cell voltages are identical during charging and discharging, along with passive balancer operation data.

Existing model-based methods require extensive preliminary experimental data and high computational power for precise modeling, while statistical methods are limited in that they can detect the presence of a fault but cannot determine the severity (quantitative value) of the fault.

By estimating cell energy changes at two points with identical voltage through voltage-current measurements and calibrating the calculated internal short-circuit current using the lowest value as a reference leakage current, this technology minimizes the impact of temperature fluctuations and quantitatively calculates internal short-circuit resistance, thereby contributing to enhanced competitiveness in the battery management system sector.

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Key Features:

• A voltage-current measurement unit that measures the voltage and current of a first cell and determines first and second time points where the voltages are identical.
• A cell energy change estimation unit that calculates the amount of cell energy change between the first and second time points using the voltage, current, and the two time points.
• A configuration that estimates internal short-circuit current by utilizing the calculated cell energy change and passive balancer operation information.
• A configuration that quantitatively calculates internal short-circuit resistance by reflecting a reference leakage current in the estimated internal short-circuit current.

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