We use cookies on our website.
Some of them are necessary for the functioning of the site, but you can decide about others.
Diagnostics for Large Battery Cells and Modules & QC
Where standard methods fail, our high-precision EIS reveals hidden cell variations. Scale your battery testing from lab R&D straight to high-throughput QC.
🟢 Live Webinar | 📆 June 25, 2026 | 🕓 16:00 (UTC+2)
Diagnostics for large battery cells and modules:
From lab EIS to industrial decisions
Don’t miss your chance to master battery diagnostics with top electrochemical experts.
Beyond 1 kHz ACIR: What a single number can miss
Conventional battery testers measure only ACIR at a single frequency of 1 kHz. Doing so passes critical degradation unobserved, risking safety liabilities and leaving performance gains on the table. Additionally, a frequency of 1 kHz is not suitable and accurate for large battery cells.
Chemical Blind Spot
A single 1 kHz measurement completely ignores slow charge-transfer kinetics and fails to capture low-frequency ion diffusion processes.
Low Capacity Correlation
ACIR at 1 kHz shows a correlation of less than 30% with actual capacity, making it a poor proxy for real battery State-of-Health.
Unfit for Large Format
High-capacity cells (like LFP) require 100–250 Hz as the ideal ACIR frequency. At 1 kHz, parasitic inductance and proximity/skin effects dominate the signal.
The Solution
Full Spectrum EIS: The Internal Fingerprint of Your Cell
Upgrading from a basic tester to Kolibrik technology is not just about gaining decimals; it is a fundamental shift in how you understand your batteries. We provide the internal fingerprint of the cell.
Isolate Specific Defects
Differentiate between mechanical failure (high freq.), SEI degradation (mid freq.), and lithium-ion diffusion limits (low freq.).
Lithium Plating Prevention
Obtain early warning signatures of dendrite formation before internal micro-short circuits occur.
EIS-Based Thermal Fingerprinting
Use temperature-sensitive impedance features to estimate relative cell temperature changes and detect non-uniformity in battery modules.
Advanced EIS Techniques
High-speed production testing using Multi-sine & PRBS excitation for End-of-Line quality control and rapid module grading.
Real-World Impact
Case Study: Powering Formula Student EV
How Kolibrik.net EIS technology and multi-criteria cell screening enabled the TU Brno Racing team to build a top-performing, perfectly balanced battery pack.
TU Brno Racing's Dragon E74
Formula Student electric racecars demand peak power output of up to 140+ kW while keeping strictly balanced cell-to-cell temperatures and voltages. Matching cells precisely is crucial to avoid limiting overall pack performance.
Multi-Criteria Cell Grading
Capacity alone doesn't tell the full story. By measuring EIS across multiple frequencies and using a multi-criteria scoring algorithm, cells were categorized and paired into groups with nearly identical internal impedance profiles.
High-Current Potentiostats
Using Kolibrik high-current Potentiostats directly in the team's workshop, students performed fast and highly precise impedance characterization. The automated setup ensured rapid throughput with micro-ohm resolution.
Applications
From the Lab to the Production Line
Kolibrik solutions help bridge the gap between laboratory EIS and practical battery diagnostics. From single-cell research with precision potentiostats to high-current testing of large cells and modules, our platforms combine accurate measurement hardware with advanced impedance analysis.
Production & Quality Control
Fast Impedance Screening
Complement capacity and 1 kHz ACIR testing with EIS-based impedance features. Detect cell-to-cell differences, outliers and dynamic behavior that a single-frequency resistance value may miss.
- Selected-frequency EIS for faster screening
- Multi-sine and PRBS excitation for accelerated tests
- Cell sorting and module matching
- Outlier detection in large-format cells
- Incoming inspection and production QA support
R&D & Characterization
Deep Cell and Module Analysis
Study how impedance changes with SOC, temperature, ageing and load conditions. Use Nyquist, Bode, fitting and DRT analysis to understand electrochemical behavior and develop practical diagnostic indicators.
- Low-impedance cell measurement, μΩ precision
- Ohmic, charge-transfer and transport-related analysis
- DRT and equivalent circuit fitting
- SOC, temperature and ageing comparison
- SOH-related trend indicators
Maintenance & Field Diagnostics
Turning Spectra into Trends
Track impedance features over time to support diagnostics of modules and battery systems. Identify abnormal changes, non-uniform ageing or possible thermal and contact-related issues.
- Periodic module diagnostics
- Impedance trend monitoring
- Detection of abnormal cells or module sections
- Preventive maintenance support
- Insight beyond voltage and temperature data
Second-Life
Smarter Battery Grading
Use EIS as an additional diagnostic layer when evaluating used cells and modules for second-life applications. Compare dynamic behavior, identify outliers and support better repurposing decisions.
- Used cell and module comparison
- Outlier detection
- Second-life grading workflows
- Dynamic behavior matching
- Complementary data beyond capacity testing
The Kolibrik Approach
Diagnostics, Not Just Data
We don't just push a single box; we analyze your problem. Whether you need R&D-grade precision or production-line speed, our hardware is built to handle high currents and amplitudes, delivering micro-ohm accuracy regardless of cell size.
From a single high-current potentiostat to rack-scale MegaEISâ„¢ arrays, every instrument shares the same measurement philosophy: capture the full impedance spectrum where it matters, not a single frequency shortcut.
MegaEISâ„¢ System
For Batteries
Parallel Multichannel
True parallel EIS across hundreds of channels for large battery pack testing. Includes bi-directional power and booster options.
High-Current
Potentiostat/Galvanostat
4-Quadrant Potentiostat
Heavy-duty Potentiostats with integrated high-precision EIS. Scalable across three lines: Ultimate, Core, and Essential.
Don’t miss your chance to master battery diagnostics with top electrochemical experts.
Let’s discuss your battery testing requirements.
Whether you are scaling up a production line, optimizing second-life battery sorting, or upgrading your R&D lab, tell us about your current testing bottlenecks.
Skip the standard sales pitch. Leave us your details and cell specifications, and a Kolibrik engineer will get back to you to discuss hardware integration, custom EIS channels, or software capabilities. Contact us today and let us show you how Kolibrik can make a difference for you!
Use this form or on email sales@kolibrik.net.
