IEST CHT Series Electrode Wettability Tester by IEST Instrument: automated benchtop testing system utilizing the liquid climbing height method and enclosed dual-door visual chamber to evaluate dynamic electrolyte wicking kinetics, vertical absorption height vs. time, and porous battery electrode wettability.
IEST EWS-2000PRO Electrode Wettability Tester by IEST Instrument: high-precision benchtop analyzer utilizing the optical capillary method and enclosed test chamber to evaluate dynamic electrolyte wetting kinetics, liquid level absorption, and porous electrode wettability performance.
IEST ETS-1500 electrode wettability tester using the weight method for evaluating battery electrode electrolyte infiltration performance.
IEST GDT Series jelly roll wettability tester using the gravimetric weight method to evaluate electrolyte infiltration in battery bare cells.

IEST Electrode Electrolyte Wetting Test System(EWS/ETS/CHT/GDT)

Introduction: The IEST Electrode Electrolyte Wetting Testing System evaluates electrolyte wetting differences of electrodes, electrolytes, separators, formulations, and processes by combining visual acquisition with electrolyte capillary action. It supports real-time wetting rate characterization, high-precision mechanical control, and stable, efficient testing for battery R&D and process optimization.

Features:

  1. Based on the principle of capillary diffusion of electrolyte in the electrodes and separators, quantitatively evaluate the difference in electrolyte infiltration;
  2. Equipped with high-precision mechanical control and visual acquisition system, the test is stable and efficient;
  3. Suitable for evaluation of infiltration differences of different electrodes, electrolytes, separator formulas and processes;
  4. Characterize the infiltration rate of electrolyte in the sample in real time.

Applications:

  • Electrolyte performance evaluation
  • Electrode consistency assessment
  • Material / electrode surface-treatment process optimization
  • Battery performance prediction
  • Production process improvement
  • Research & development(R&D)
Submit Inquiry

Description

1. Principle of Electrode Wetting

The Lucas–Washburn Equation is commonly used to describe the dynamic of liquid absorption in electrode pores, as represented by the equation below:

  • r represents the radius of the capillary (m),
  • σ represents the surface tension of the imbibition fluid (N/m),
  • η represents the viscosity of the imbibition fluid (Pa*s),
  • θ represents the contact angle of the wet phase (°),
  • h represents the liquid suction height (m),
  • t represents the liquid suction time,
  • cr represents a fixed value, called the formal radius.

IEST Electrolyte Wetting Testing System Detail-3

2. Applications

  • Electrolyte performance evaluation

  • Electrode consistency assessment

  • Material / electrode surface-treatment process optimization

  • Battery performance prediction

  • Production process improvement

  • Research & development(R&D)

3. Capillary Wetting System: EWS Series – Simulation & electrode uniformity

Key Features：

  • Equipped with a high-precision vision acquisition system, ensuring stable and efficient test repeatability.

  • Enables in-situ real-time characterization of the electrolyte wetting rate for lithium-ion battery anode electrodes.

  • The greater the compacticion of the electrode, the lower the porosity, resulting in poorer electrolyte wetting.

IEST Electrolyte Wetting Testing System Details-4

4. Height Wetting System: CHT Series – Electrode uniformity & process stability

4.1 Innovative Solution

The CHT-2000 Pro electrode electrolyte wetting testing solution is an optimized and enhanced version of the existing
CHT-2000 system. Upgrades to the light source and detection unit have delivered a substantial improvement in
measurement accuracy. Byinnovatively combining a multi-color light source with Al-powered detection, the system offers
a greater adaptability to a wider range of samples types. Furthermore, the integration of an automatic sampler greatly
increases testing throughput and minimizes manualintervention.

IEST CHT Series electrode electrolyte wettability tester innovative solution featuring multi-color ring light source, proprietary AI algorithm, and wide sample compatibility.

4.2 Key Features

  • Equipped with a high-precision CCD camera and a multi-color ring light source.

  • Enables in-situ real-time characterization of the electrolyte wetting rate for lithium-ion battery anode electrodes.

  • Applicable samples: cathode, anode, and composite separator.

  • The integration of Al-based detection backed by a large sample database further enhances test accuracy.

Test principle and dynamic wetting kinetics of IEST CHT Series electrode wettability tester showing height vs. time and Lucas-Washburn K-value calculation for 35 anode sheets.

The electrode sheet ivertically immersed in an electrolyte bath. As the electrolyte spreads upward along the electrode surface, a high-precision vision system captures the wetting line height and correlates it with time to calculate the wetting coefficient K.

4.3 Key Software Features

  • Offering simple operation with intuitive display of test samples and test modes, thereby streamlining the testing work-flow.

  • Recording the relationship between wetting-line height and time in real time, and saving images at key stages as
    required.

  • Displaying the slope of the h-√t curve, i.e., dh/dt.

  • Enabling retrieval and display of historical test data, as well as export of h-√t curves.

IEST CHT-2000 electrode electrolyte wetting testing software interface showing sample mode selection, parameter configuration, real-time wicking curves, and K-value calculation.

5. Weight Wetting System: ETS Series

5.1  ETS-1000 – Evaluate Jelly Roll(JR) Wetting Time for Dry Cells

Key Features：

  • Equipped with a high-precision vision acquisition system, ensuring stable and efficient test repeatability.

  • Enables in-situ real-time characterization of the electrolyte wetting rate for lithium-ion battery anode electrodes.

  • Applicable samples: Anode electrodes/Jelly Roll(JR) cells

  • Supports simultaneous testing of three parallel samples, demonstrating good consistency in electrolyte wetting.

IEST Electrolyte Wetting Testing System Details-7

6. Wettability Jelly Roll(JR) Gravimetric Tester: GDT2000

6.1 Innovative Solution

The GDT-2000 was developed specifically for evaluating the electrolyte weting performance of lithium-ion battery jelly
rolls. Compared with traditional methods that rely on manual operation and intermittent recording, this equipment
substantially improves the consistency and repeatability of the testing process.

The automated lifting platform, integrated with real-time weighing, reduces the influence of operator variability on test results, while the constant-liquid-level design effectively suppresses systematic errors caused by buoyancy fluctuations, allowing the mass-time curve to more accurately reflect the intrinsic wetting behavior of the jelly roll.

Through automation and standardized control, the GDT-2000 delivers more stable and reliable data for comparing wetting performance across different batches, material systems, and process conditions, enhancing the comparability of test results and providing a higher-quality experimenta basis for process optimization and product development.

IEST GDT-2000 Jelly Roll Wettability Gravimetric Tester by IEST Instrument: innovative hardware architecture featuring real-time electrolyte replenishment control system, high-precision peristaltic replenishment pump for constant liquid-level maintenance, and motorized lifting platform for automated buoyancy-free battery bare cell wetting evaluation.

6.2 Analysis MethodIEST GDT-2000 jelly roll electrolyte wettability gravimetric tester testing principle schematic and dynamic wetting mass-gain curves for five bare cells from the same batch.

The jelly roll is immersedvertically in an electrolyte bath, with the electrolyte wetting it upward from the bottom. A high-precision non-contact liquid-level sensor continuosly monitors the electrolyte level in the bath, while a weighing system records the real-timemass gain of the jelly roll.

6.3 Upgraded Technical Features

  • Liquid-Level Control System: An electrolyte bath liquid-level control system (syringe pump + height sensor) reduces
    inter-group systematic error caused by liquid-level fluctuations.

  • Pressure-Applied Testing: A surface-pressure fixture (pressure range: 0-0.4 MPa) with a pressure-film detection system is added.

Applications

1. Capillary Wetting System-EWS Series

IEST Electrolyte Wetting Testing System Details-5

  • Four different compaction densities of electrodes: 1 (1.35 g/cm³) < 2 (1.5 g/cm³) < 3 (1.6 g/cm³) < 4 (1.65 g/cm³)
  • The greater the density of the electrode, the lower the porosity and the worse the electrolyte wettability.

2. Weight Wetting System-ETS Series

IEST Electrolyte Wetting Testing System Details-8

  • Trimming three sets of anode electrode from the same batch (65*70mm)

3. Height Wetting System-CHT Series

3.1 Wetting performance testing of notched anode electrode sheets, with the resultsshown below:

IEST CHT Series electrode height wettability tester application case evaluating electrolyte wetting performance and Lucas-Washburn wicking curves of notched anode electrode sheets.

3.2 Wetting performance testing of separator-composite cathode electrode sheets, with the results shown below:

Dynamic electrolyte wicking curves and Lucas-Washburn linear fitting of separator-composite cathode sheets evaluated by IEST CHT Series electrode height wettability tester.

4. Jelly Roll Wettability Gravimetric Tester-GDT2000

4.1 The wetting curves obtained by applying 0-0.2 MPa of external pressure to the jellyroll using a fixture are shown below:

IEST GDT-2000 Jelly Roll Wettability Gravimetric Tester by IEST Instrument: application case evaluating dynamic electrolyte absorption kinetics (m vs. t and m vs. sqrt(t)) of battery bare cells under 0 to 0.2 MPa external mechanical clamping pressure using a specialized fixture.

As the external pressure increases, the initial wetting rate decreases. At a pressure of 0.2 MPa, the saturated electrolyte uptake is further reduced.

Video

Specifications

Capillary Wetting System-EWS Series

Model EWS1100
Pressure control range 0~500g
Pressure resolution / Accuracy 0.01g / ±0.3%F.S
Single-pixel precision 10μm
Liquid absorption capacity 2μL
Electrode dimensions 29*29mm

Weight Wetting System-ETS Series

Model ETS1100
Balance capacity 0~220g
Balance precision ±0.1mg
Electrode size 65*70mm

Height Wetting System-CHT Series

Model CHT-2000pro
Equipment Dimensions Customizable to Sample Requirements
Test Time 0 ~ 20 min
Pixel Accuracy 100 μm
Electrode Size 70 × 40 mm
Sample Chamber Capacity 10 Samples

Jelly Roll Wettability Gravimetric Tester-GDT2000

Model GDT-2000
Equipment Dimensions Customizable to Sample Specifications
Test Time 0 ~ 48 h
Weighing Accuracy 10 mg
Replenishment Rate 0 – 10 mL/s
Liquid-Level Control Accuracy 1 mL

Download

IEST Electrolyte Wetting Measurement System(EWS/ETS)

Download
IEST Electrolyte Wetting Measurement System(CHT2000Pro)

Download
IEST Jelly Roll Wettability Gravimetric Tester(GDT2000)

Download

Other Featured Products

Envelope Whatsapp Weixin

Contact Us

Please fill out the form below and we will contact you asap!

IEST Wechat QR code