What it is

The EA-BIM 20005 is a 20-channel battery impedance meter that performs electrochemical impedance spectroscopy (EIS) on lithium-ion battery cells. It measures impedance from 1 mHz to 10 kHz with better than 1% accuracy, using a multi-sine stimulus that runs hundreds of times faster than traditional swept measurements, across 20 multiplexed channels in a 19-inch, 3U form factor. Each EIS channel is paired with a 4-wire PT100 temperature channel, and an integrated DC power stage supplies up to ±1 A at 5 V so impedance can be measured during charge, discharge, or temperature change.

• 20-channel electrochemical impedance spectroscope (EIS) for Li-ion cells
• 19-inch, 3U form factor with a 20-channel high-speed multiplexer
• Frequency range 1 mHz to 10 kHz
• AC stimulus up to 10 A peak-to-peak
• Parallel multi-sine excitation up to 32 frequency points, hundreds of times faster than swept
• Standard swept measurements also supported for cross-instrument comparison
• Impedance range 0.1 mΩ to 100 mΩ, |Z| accuracy typically <1% after calibration
• 20 channels of 4-wire PT100 temperature measurement
• Integrated DC power stage: up to ±1 A at 5 V for EIS during charge/discharge
• No need to disconnect a battery cycle tester before performing EIS
• USB device port and two CAN bus interfaces
• Low power consumption (<60 W); no active cooling required
• Combines with cycle-testing systems such as the EA-BCTS

What it is used for

Some of the use cases for the BIM 20005 include:

• Incoming inspection — fast, accurate EIS screening of high volumes of Li-ion cells at goods-in
• Cell aging monitoring and prediction — tracking impedance and temperature over life to characterize and predict cell aging
• Research and development — detailed EIS characterization of cylindrical, pouch, and prismatic cells, with impedance and temperature captured on a single instrument

How it measures

Multi-sine EIS for throughput. Traditional EIS applies a current at each test frequency and measures the resulting voltage, one frequency at a time. The BIM 20005 instead applies a multi-sine stimulus that measures impedance across multiple frequencies at once, up to 32 frequency points in parallel, making it hundreds of times faster than a conventional sweep. When results must be compared with other instruments, it also performs standard swept measurements. A 20-channel high-speed multiplexer connects the cells, keeping measurements quick and the cost per channel low.

AC stimulus and range. The AC stimulus reaches 10 A peak-to-peak, suitable for cylindrical, pouch, and prismatic cells, with the available current scaling by frequency band, and the impedance range spans 0.1 mΩ to 100 mΩ with typical |Z| accuracy better than 1% after calibration.

Impedance and temperature together. Every EIS channel is accompanied by a high-precision 4-wire PT100 temperature channel, so both impedance and cell temperature are tracked on one instrument across all 20 channels.

EIS during cycling. A built-in DC power stage delivers up to ±1 A at 5 V, allowing impedance measurements during charging, discharging, or temperature-change tests. The instrument also integrates into larger battery test systems such as the EA-BCTS, and a cycle tester can remain connected during EIS testing without degrading results.

Software

The included battery-impedance PC software connects over the rear USB device port for EIS testing out of the box. It configures the system, runs standard swept or rapid multi-sine measurements, measures during charge and discharge, evaluates results with built-in visualizations and analysis tools, and records data in the file formats you prefer. Two onboard CAN bus interfaces support integration into battery cycle-test systems and custom test programming.

Why engineers pick it

High throughput on high volumes. Parallel multi-sine EIS across 20 multiplexed channels turns a common testing bottleneck into a fast step, hundreds of times quicker than swept measurement.

One instrument for impedance and temperature. A 4-wire PT100 channel on every EIS channel captures cell temperature alongside impedance, removing a separate temperature instrument.

EIS without unwiring the test. The integrated ±1 A / 5 V DC stage and CAN integration let impedance be measured during cycling, with the cycle tester left connected.

Bench- and floor-friendly. Twenty EIS channels in 3U with under 60 W draw and no active cooling conserve space and simplify installation.

Configuring and ordering

The BIM 20005 ships as a complete 20-channel instrument, with a matched cable set available as an accessory.

• Instrument — the EA-BIM 20005-10-20 provides 20 EIS channels and 20 PT100 temperature channels.
• Accessory — the EA-BIM Cable Set is the recommended set of cables for 20 cells and 20 temperature sensors.

Configure your BIM 20005 on this page and buy it directly. For integration with an EA-BCTS or another battery cycle-test system, or for guidance on channel and cabling setup, contact W5 Engineering and we will scope it with you.