Bipolar Plate

badge_bipolar_plate_clear

Today we reached our fourth target milestone – fabricating bipolar battery plates.

What is the Bipolar Plate Milestone?

This milestone demonstrates that our scalable manufacturing process can be used to form both anode and cathode (positive and negative) surfaces on each side of a single battery plate, which is a critical requirement for building multi-cell, bipolar batteries.

Why is this an important milestone?

In a bipolar battery, electricity flows through the battery plates rather than into and out of single cells wired in series. This architecture reduces the internal resistance of the battery and reduces weight & complexity by eliminating the need for cell-to-cell wiring. With bipolar plates, we can now “stack” an arbitrary number of bipolar plates to create a multi-cell battery of the desired voltage. The process we have developed for creating bipolar plates demonstrates:

  • Two separate methods for creating bipolar plates, which we can optimize and compare
  • A repeatable process for each manufacturing method that allows us to control characteristics of the active mass
  • Validation of the current flow through the bipolar architecture
  • An improved casing assembly method that eliminates a major component and further reduces leakage risk

What are the next key milestones?

  • Multi-Cell Battery – assembly of multiple cells to create a higher voltage battery
  • High Linear Density – increase the number of cells per centimeter in a multi-cell battery
  • Grant Project #1 Completed – demonstration and documentation of the key performance criteria of a multi-cell Gridtential battery for the California Energy Commission EISG grant project
  • Active Mass Adhesion – improvement in the adhesion & durability of active mass on each side of the bipolar plates
  • Active Mass Porosity – demonstration of ability to control porosity and other Active Mass characteristics during the fabrication process
  • Full-Size Plate – Manufacture of the first full-size battery plate using the fabrication processes and techniques developed thus far.
  • First Alpha Unit – delivery of the first Alpha Unit for external testing in both a laboratory setting and in a real application

The Gridtential engineering team met this milestone with not one, but two separate and repeatable methods for building bipolar plates. In addition, several key processes and components have been improved and built-in to our cell manufacture and testing platform.

We look forward to sharing further updates with you as they are available. Thank you for your support of Gridtential Energy.