Identify the causes of battery cell defects by measuring AC impedance at multiple frequencies. You can for example identify batteries that have issues with electrode reactions at the electrode interface by checking impedance at low frequencies.
The chemical reactions in batteries involve several processes and each process has its own reaction speed. By sweeping the frequency and measuring the impedance, the characteristics of each part can be evaluated separately. This allows to identify battery deterioration factors.
Measured data for pristine batteries
Some high-capacity lithium-ion batteries have an internal impedance of less than 1 mΩ. The BT4560 can measure ultra-low impedances of 1 mΩ or less with stability and repeatability. The four-terminal-pair method reduces the effects of induced magnetic fields, such as cable routing, eddy currents caused by surrounding metal, and interference when multiple units are used simultaneously.
Measured data for degraded batteries
Compared to the conventional four-terminal method, the stability of the measuring instrument incorporated into the production line is improved.
Measure efficiently by combining the HIOKI BT4560 and SW1001
Optimal set-up for a time-saving solution to measure: a switch mainframe, the BT4560 battery impedance tester and a 6 channel battery test fixture. The EIS (Electrochemical Impedance Spectroscopy) for each of the six 18650-size LIB’s is measured automatically, controlled by the switch mainframe SW1001.
HIOKI battery impedance meter BT4560
HIOKI Switch Mainframe SW1001
|Allowable input voltage||Up to 5 V|
|Impedance measurement||Parameters: R, X, Z, θ, Frequency: 0.1 Hz to 1050 Hz, Measurement ranges: 3.0000 mΩ, 10.0000 mΩ, 100.000 mΩ |
Testing current: 3 mΩ range: 1.5 Arms, 10 mΩ range: 500 mArms, 100 mΩ range: 50 mArms
|Voltage measurement||Measurement range: 5.00000 V (single range), Measurement time: 0.1 s (Fast) to 1.0 s (Slow)|
|Temperature measurement||Range: -10.0 °C to 60.0 °C, Measurement time: 2.3 s|
|Basic accuracy||Z: ±0.4% rdg. θ: ±0.1 °, V: ±0.0035% rdg. ±5 dgt. , Temperature: ±0.5 °C (at 10.0 to 40.0 °C)|
|Functions||Comparator, self-calibration, sample delay, average, contact check, measurement current error, and other|
|Interface||RS-232C/USB (virtual COM port) * Cannot be used simultaneously |
EXT. I/O (NPN/PNP can be switched)