BT4560-50 Battery Impedance Meter

• testing Li-Ion batteries without charging and discharging them
• compatible with SW1001 and SW1002 switching systems
• battery measurement using low frequency method (1 Hz or less)
• functions for comparison of measured values, self-calibration, contact check, etc.
• communication interfaces USB, RS-232C and LAN

Detailed Product Overview

The HIOKI BT4560-50 Battery Impedance Meter is designed for precise impedance measurement of battery cells across a frequency range of 0.01 Hz to 1050 Hz, with a DC voltage measurement capability of ±5 V. Optimized for lithium-ion cell evaluation, this frequency span captures the characteristic impedance behavior of Li-ion chemistry, enabling detailed analysis of both resistive and reactive components. With selectable measurement ranges of 3 mΩ, 10 mΩ, and 100 mΩ, the instrument is well suited for large-capacity cells that exhibit very low internal resistance, such as traction batteries and storage systems.

The maximum test current reaches 1.5 A rms in the 3 mΩ range, decreasing proportionally at higher ranges. Impedance resolution down to 0.1 μΩ ensures accurate characterization even of ultra-low-resistance cells. The four-terminal-pair measurement method, implemented using coaxial connections, minimizes the influence of cable resistance, magnetic coupling, and induced noise. The instrument accepts both positive and negative cell voltages, increasing flexibility for different test configurations.

Applications and Electrochemical Impedance Spectroscopy (EIS)

The BT4560-50 is widely used for impedance evaluation of high-capacity cells in EV traction batteries, stationary energy-storage systems, and cell manufacturing lines. In production environments, it supports end-of-line verification after cell assembly. In module or pack manufacturing, it is applied for incoming inspection, cell grading, and matchingto ensure balanced pack performance.

In research and development, the instrument provides insights into diffusion behavior, aging mechanisms, state-of-health (SoH) indicators, and impedance evolution under different operating conditions. It is particularly effective for studies involving degradation pathways and material behavior.

Connected to a PC via USB or LAN, the BT4560-50 can perform electrochemical impedance spectroscopy (EIS). The supplied software automates frequency sweeps, records impedance values, and displays Nyquist and Bode plots. Test data can be exported to ZView® for in-depth equivalent-circuit modeling and advanced analysis.

Perfect for System Integration

The instrument includes LAN, RS-232C, and an EXT. I/O port for external triggering and control, making it easy to integrate into automated test benches. It interfaces smoothly with PLCs, third-party controllers, or multiplexing systems for sequence control. LabVIEW drivers and example applications support PC-based automation, while compatibility with the HIOKI SW1001 / SW1002 switching systems enables scalable setups for multi-cell testing.

The BT4560-50 uses a low-level AC excitation signal that does not disturb the electrochemical state of the cell, avoiding heat generation or unwanted reactions—even with high-capacity or experimental cell designs. A range of specialized measurement cables is available, including the L2002 Kelvin Clip Lead for laminated pouch cells and the L2003 Kelvin Pin Lead for cylindrical or mounted cells, suitable for both laboratory and automated applications.

Designed and manufactured in Japan, the BT4560-50 provides the measurement stability, precision, and reliability required in both R&D and production testing of advanced battery technologies.

Higher-Frequency Option (BT4560-60)

For applications requiring analysis above 1050 Hz, the BT4560-60 extends the measurement range up to 10 kHz. This higher limit supports investigation of fast interfacial processes such as SEI behavior, separator characteristics, and other high-frequency phenomena relevant in advanced cell development. Apart from the extended frequency range, its specifications and operation are identical to the BT4560-50.