determine current density with DiLiCo

Optimized for the baltic quickCONNECT fixture FC25/100. Available in three different variants.

Application

Current density and temperature distribution measurement for the baltic quickCONNECT fixture FC25/100 from the company balticFuelCells GmbH.

Technical data

Current density: Up to ± 6 A
Temperature: Up to 175 °C
Number of segments: Depending on version
Cell voltage measurement: 0 to 2,5 V
Communication: CAN, USB (via Adapter)
Optional: 5 x temperature sensor for media circuits
PDF Datasheet download
Sent request Delivery time: 8 weeks

Specifications

The product series DiLiCo current density offers a completely new price level for current density, temperature and cell voltage measurement for the baltic quickCONNECT fixture FC25 / 100 through a new, specially developed measuring method. The three variants of the measuring system provide optimal conditions for use in various applications. No matter if high current densities (DiLiCo HIGH CURR) or high temperature (DiLiCo HIGH TEMP), DiLiCo offers the right measuring system for both measuring conditions. The third variant (DiLiCo CURR TEMP) offers the possibility to determine both the current density and the temperature distributions precisely and at a new price level. All measuring instruments in this product series also have an integrated cell voltage measurement. Optionally, with each variant of the measuring system, up to five temperature sensors for the media circuits can be connected.

The current density and temperature distribution visualize the activity of the membrane and allow analysis of the design of bipolar plates, gaskets and other components. DiLiCo current density thus provides valuable insight into the interior of the fuel cell and electrolyzer.

Delivery

  • DiLiCo current density sensorlayer
  • Evaluation electric with software
  • External power supply
  • Instructions

User

  • User of the baltic quickCONNECT fixture FC25/100

Why it makes sense to measure current densities in fuel cells?

  • Identification of partial undersupply over the membrane surface, which can not be recognized by the cell voltage.
  • Recognition of local aging breakthroughs in certain membrane areas.
  • To compare different material and design configurations.
  • Evaluation of the contact resistance of bipolar plate, gas diffusion layer, seal and membrane-electrode unit for different contact pressures of the stack.
  • Statements on the quality of the gas distribution of flow fields.
  • Optimization of operating parameters by evaluation and adaptation of cell components.
  • Identification of flooding and drying conditions.
  • Data usage for modeling and extension.

What additional insights can the measurement of the current density provide?

Example: Successive flooding of the fuel cell within 60 seconds at a constant current after reducing the speed of the H2 recirculation pump.


The current density of the membrane areas at the media inlet increase by the value that the current density in the direction of the media outlet drops along the flow channel during the flooding. The membrane in the entrance area now makes up to 600 mA / cm² (previously 470 mA / cm²) compared to about 380 mA / cm² at the output (previously 520 mA / cm²). A connection between the speed of the recirculation pump and the changed humidity conditions in the output areas of the flow fields could be deduced.