Batteries for clean energy


The Ambri technology

Ambri’s initial commercial cell delivers the performance and safety benefits unique to Ambri technology

General specifications

Dimensions (including high temperature seal)216 mm L x 137 mm W x 254 mm H
(8.5” x 5.4” x 10.0”)
Mass56 lbs
Cell enclosure materialStainless steel
Nominal OCV0.95 V
Nominal capacity800 Ah
Nominal continuous power160 W
Cycling voltage range1.25 – 0.5 V

Specifications subject to change without notice and not intended for use as design reference. Contact Ambri for latest information.

Energy Storage System

Integrators will offer energy storage systems in ready-to-install DC containers for applications that require high energy capacity, frequent cycling, long life and high efficiency.

Cells are connected within a thermal enclosure to form a MWh scale Ambri-based system. The system is insulated and “self-heating” when operated, requiring no external heating/cooling to keep the batteries at operating temperature. Multiple systems placed together on site are connected in parallel.

Capacity: 1000 kWh, 250 kW
DC Efficiency: exceeds 80% under wide range of use cases
Response time: <500 milliseconds
Voltage: 500 —1500 V
Footprint: 10-foot shipping container

The Ambri battery platform

Game-changing technology

The liquid metal battery is comprised of a liquid calcium alloy anode, a molten salt electrolyte and a cathode comprised of solid particles of antimony, enabling the use of low-cost materials and a low number of steps in the cell assembly process.

The active materials in Ambri’s cells reversibly alloy and de-alloy while charging and discharging. This process does not suffer from the degradation mechanisms that cause capacity fade in other chemistries.

High-temperature chemistry

At room temperature, Ambri’s cell is non-conductive and its active materials are solid metals and a solid electrolyte. Upon heating to 500˚C temperature, Ambri-based battery systems operate at maximum performance level no matter the external temperature and require no power-hungry air conditioning.

Ambri-based systems generate their own heat during use, thereby eliminating the need for auxiliary power for temperature control. These systems like to be used – a full charge/discharge cycle at least every two days will keep the system at its operating temperature and higher duty cycles will not increase degradation.

Zero maintenance

Ambri-based systems are expected to be packaged in 1000VDC, MWh-scale containers. These containers will be factory assembled and shipped to site fully populated and sealed. Each of these containers will contain no replaceable or serviceable components. This eliminates on-site maintenance and means that the container becomes the modular and replaceable system component. Typically with blocks of 10 or more containers connected in parallel at the DC side of site PCS, system reliability is achieved through N+1 redundancy at the container level.

Lowest cost energy storage system

Ambri cells utilize electrodes comprised of commodity materials that cost 1/3 of those in NMC lithium-ion cells. The manufacturing of Ambri cells is far simpler and requires 1/3 to 1/2 the capital expense per MWh of production than lithium-ion. Furthermore, Ambri-based systems do not have cooling, fire suppression or module- and rack-based BMS equipment as lithium ion-systems require. For these reasons, long-duration Ambri-based battery systems are half the cost of lithium-ion when comparing 20-year, eight-hour-duration systems.

Lithium-ion batteries are projected to drop in price from current levels to less than $100/kWh at some time in the mid to late 2020s. Even compared to this low future lithium-ion price of $100/kWh, these energy storage systems will be 70% more expensive than Ambri-based battery systems.

Not lithium-ion

No risk of combustion

Ambri energy storage systems will answer the world-wide need for grid storage with an efficient and safe system. As lithium-ion batteries have flooded the market for grid storage, opportunities for safer, longer life batteries for long-duration applications have emerged.

To date over 20 lithium-ion energy storage systems have resulted in explosions or fires. Ambri batteries are not explosive, combustive or temperature sensitive. No level of overcharging, over-discharging, short circuiting or temperature has caused any safety concerns with these cells.

Ambri is currently engaged with the world’s leading agencies for the development of an appropriate set of tests to certify the safety of Ambri cells.