Battery status check


The AVL DiTEST micrΩHM (IRP, Internal Resistance Probe) measures the internal resistance of single modules of traction batteries as well as the contact resistances at the connectors between the modules (busbars) and the resistances of the busbars itself. The compact design combined with intuitively guided software allows to carry out the measurements in the workshop – quickly, easily and accurately.

The internal resistance is a key indicator for the state of health of a battery module. A healthy battery pack has both internal resistances of the modules as well as resistances of the busbars low. These resistances may increase with aging or when battery modules and busbars get defective. If a high current is then called up, e.g. when accelerating, the battery can overheat. This leads to a voltage drop and thus reduces the power output of the battery. In the worst case, an increased resistance can even cause a fire in the battery.

By measuring and comparing the internal resistances of different modules within the battery pack, those with increased resistance can be found and replaced. micrΩHM can measure precisely even very low resistances in μΩ-range and is therefore capable to find bad contact points or damaged busbars. Moreover, you can use micrΩHM to assure a proper installation of new modules and their connections, because dirty or not fully tightened busbars will show a higher contact resistance.

Key benefits

  • Measuring the internal resistance of a battery module
  • Measuring the resistance of the module-to-module connection including the contact resistances
  • Free adjustable current and pulse duration
  • Kelvin clamps to compensate the resistance of the measurement lines
  • Safe operation
  • Intuitive operator guidance
  • Powered by USB

Features at a glance

  • Direct current discharge pulse is applied (current sink)
  • Voltage drops are measured
  • Internal resistance of the module/contact resistance is calculated

micrOHM (IRP, Internal Resistance Probe)

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