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Technology

Eos Z3

Overview Performance Specs

Three proprietary components.
One ingenious design.

With more than 95 patents pending, published, or issued, our streamlined Eos Z3 battery module design features an aqueous electrolyte, bipolar electrodes, and a polymer casing.

Non-degradable bipolar electrodes

Conductive plastic anodes (-)and carbon-felt cathodes (+) make up the Z3 electrodes. They’re mechanically tough, corrosion resistant, and chemically stable, delivering for years with virtually no degradation. Plus, our bipolar structure simplifies internal battery connections to reduce internal resistance and improve round-trip efficiency.

High-performance aqueous electrolyte

Our innovative blend of water, halides, additives, and buffering agents make up our proprietary aqueous electrolyte. The formula both enhances zinc solubility and plating and eliminates the dendrite and densification issues that can lead to performance decay and safety hazards.

Fully-sealed polymer casing

A rugged, injection-molded thermoplastic polymer exterior provides an optimized structure into which our electrodes are inserted—the Z3 design requires just 20 of them—minimizing materials, manufacturing, and maintenance. And all while eliminating the risk of any external leaking.

Inspired by zinc plating baths

Z3 battery modules store electrical energy through zinc deposition. Our aqueous electrolyte is held within the individual cells, creating a pool that provides dynamic separation of the electrodes. During charge and discharge, ions move through the electrolyte to their respective electrode to donate or accept electrons, creating a current flow through the bipolar stack.

Inspired by zinc plating baths

Realizing the full power of zinc.

Eos Z3 modules are as high-performing and price-competitive as leading industry storage solutions in the intraday market. But our proven zinc-powered chemistry delivers significant additional operational advantages in 3- to 12-hour discharge duration applications that other technologies can’t.

Simple

Fully sealed. Long lived.

Each Z3 battery module is a self-contained unit, a closed-system design with no moving or delicate parts, so they’re as easy and cost-effective to maintain as they are to manufacture. And they can last at least 6,000 cycles—almost twice the operational life of most conventional battery chemistries.

Lasts
20 years
or 6,000 cycles

Safe

Non-flammable. Non-corrosive.

Z3 modules are inherently safe to use. With a water-based electrolyte and flame-retardant polymer framing, there’s no risk of thermal runaway. When fully charged, they’re at most mildly acidic (pH 2-4 range). And even when overcharged, only negligible levels of hydrogen are off-gassed.

Certified to the
UL1973
Batteries in Stationary Applications standard

Durable

High tolerance. Low degradation.

No matter what conditions our Z3 battery modules face, they keep on going—even fully recovering from 90⁰C+ abuse cycles with just a simple, short rest period—with no change to their overall degradation curve. Which, at less than 9% over the first 3 years and then zero thereafter, is well below conventional standards

Retains
>91%
of rated capacity over product lifespan

Flexible

Variable DoD. Variable duration.

Our zinc-based battery chemistry is highly tolerant of significant variation in operational requirements. A Z3 module’s storage duration can range from 3 to 12 hours, with no impact on degradation. And the maximum DoD can be reduced for applications demanding round-trip efficiency in the mid-80s.

Maximum of
100%
Depth of Discharge (DoD)

Available

Reliable supply. Ethical sourcing.

Z3 modules require just five low-cost, widely-used, earth-abundant commodities, that have no geopolitical issues connected to their extraction. This enables local sourcing that minimizes the risk of supply chain disruptions—and related price swings.

Approximately
80%
of materials sourced within a day’s drive

Fully recyclable at the end of their usable life, Eos batteries are a truly sustainable solution.

Fully recyclable at the end of their usable life, Eos batteries are a truly sustainable solution.

Power that stacks up.

Z3 battery modules are the building blocks of all of our ingenious energy storage systems. Our standard Z3 strings are racked in a variety of configurations to form our Eos Cube, Eos Hangar, and Eos Stack solutions.

Find out how we’re ensuring continuous innovation

Research & Development

Eos Ingenuity Lab

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See how we’re building our products—and our team

Manufacturing

Eos Ingenuity Park

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