Measurement example

The worst-case scenario for insulation failure of a battery is for the outer insulation to short-circuit to the negative electrode and come into contact with the electrolyte. It is therefore extremely important to verify the state of insulation after electrolyte filling. This test is executed with low voltages starting from 0.1 V in order to prevent decomposition of the electrolyte or other negative influences on the performance of the battery.

The outer aluminium of a normal pouch cell is insulated from the electrodes and the electrolyte.

Insulation failure can cause the outer insulation to short-circuit to the negative electrode and come into contact with the electrolyte. The resulting current pathway formed by cracks inside the pouch causes an electrochemical reaction, which results in a significantly reduced the life of the battery cell.

Detect short-circuits between the negative electrode and the enclosure by measuring the DC voltage between the positive electrode and the enclosure. 0 V is the result as a good cell, but if the same voltage as the battery is detected, it indicates that the negative electrode has short-circuits to the enclosure.

  • Low voltage measurement usage prevents damage to the battery.
  • A capacitive contact check function prevents false readings due to poor probe contact that would otherwise pass even when 0 V is shown because of no contact

Equipment used:

High Precision DC Voltmeter for Lithium-ion Batteries

Precision DC Voltmeter DM7276

  • High-accuracy measurement model with one-year accuracy of 9 ppm
  • Contact check function maximizes measurement reliability
  • Binning and temperature compensation makes it ideal for developing & manufacturing Li-ion batteries
  • Supports global production with built-in variable power supply

DC Voltage 100 mV (±120.000 00 mV) to 1000 V (±1000.000 0 V), 5 ranges
Basic accuracy 10 V range: ±0.0009% rdg. ±12 μV
Temperature -10.0°C to 60.0°C, combined with sensor Z2001: ±0.7°C (-10°C to 50°C)
Measurement support functions Temperature compensation, Contact check, Comparator, BIN, Absolute value judgment, etc.
Power supply 100 to 240 V AC, 50/60 Hz, 30 VA
Interfaces Standard: LAN (100BASE-TX), EXT. I/O, USB flash drive / USB device (USB2.0 Full-Speed). Optional: GP-IB (-02 type only) / RS-232C (-03 type only) / PRINTER (-03 type only)
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