A battery system is disclosed. The battery system includes a plurality of battery cells, and a battery cell balancing unit, configured to adjust voltages across each of the battery cells to reduce variation among the voltages across the battery cells. The battery cell balancing unit includes a controller configured to receive a DC reference current and to generate an AC current based on the DC reference current, a transformer, a rectifier circuit including a rectifier connected to the output coil, and a switching unit including a plurality of switches, each configured to selectively connect the rectifier to one of the battery cells.

An energy storage system and a method of controlling the same is provided. The energy storage system may directly provide generated DC power or DC power stored in a battery to a DC load without performing a DC/AC conversion or an AC/DC conversion. Furthermore, in the case where a grid operates abnormally (e.g. power interruption) and the energy storage system functions as an uninterruptible power supply (UPS), power stored in a battery may be selectively provided to loads according to power remaining in a battery, and thus stored power may be used stably.

A system that manages a supplemental energy source connected to a power grid uses a two stage control strategy to manage power transfers in and out of the power grid as well as in and out of an energy storage system, such as a battery bank. One stage uses a non-linear transfer function to control an output frequency of a DC-to-AC inverter to limit undesired effects of power transients that occur on the grid. A second stage uses control strategy for transferring energy between the energy storage system and an internal DC link based on a relationship between a voltage on a DC link connecting the first and second stages and a DC link reference voltage, the voltage on the DC link, and a voltage at the energy storage system. The control strategy includes rapid charging, over-charging protection, and grid transient stabilization.

An electrochemical energy storage device includes a cathode, an anode, and an electrolyte disposed between the cathode and the anode. The anode includes a capacitive material as a majority component, and further includes an electrochemically active material as a minority component, such that an operating potential of the anode is configured according to a reaction potential of the electrochemically active material.

Nanoparticle-enhanced phase change materials (NEPCM) including nanoparticles dispersed with a base phase change material and that exhibit enhanced thermal conductivity in comparison to the base phase change material.

The thermal energy storage material (TESM) system includes a container having a wall surface, and a TESM in at least partial contact with the wall surface. The TESM may include, consist essentially of, or consist of a metal containing compound comprising lithium, one or more different metal cations (i.e., different from lithium) and one or more polyatomic anions. The TESM may have a liquidus temperature, TL, from about 100° C. to about 250° C. The TESM may exhibits a heat storage density from 1 MJ/l to 1.84 MJ/l, as measured from 300° C. to 80° C. The TESM system may be free of water. If any water is present in the TESM system, the water concentration preferably is less than 10 wt. %. Preferably, the TESM system is generally resistant to corrosion at temperatures of about 300° C.

A mechanical energy storage system includes a containment vessel, a drive shaft operatively connected to a generator/motor and supported for rotation in the containment vessel. A support structure is attached to the drive shaft and configured for radial extension from a rest position proximate the drive shaft. A resilient member having a mass and extending circumferentially around the drive shaft is connected to free ends of the support structure and configured to store elastic energy when the support structure extends radially from its rest position. Upon rotation of the drive shaft, the resilient member stores both elastic and rotational energy commensurate with its mass and elastic properties.

The technology is directed to an energy storage and release system that stores energy and enables a repeatable and accurately timed release of energy. A shaft member supports a drive assembly, a locking assembly and a lever member there between. The lever member and locking assembly are attached to the shaft. The drive assembly rotates freely about the shaft and loads energy into a torsion spring in communication with the lever member. The torsion spring connects at one end to the drive assembly and at the other end to the lever member without contacting the shaft member. The locking assembly provides a triggered release mechanism for selective release of stored energy from the torsion spring that accordingly rotates the lever member. The system can automatically reload the torsion spring once a signal is received from any number of events including, when the rotating lever member contacts a stop member or limit sensor that signals the end of travel for the lever member in either rotational directions.

Siemens Gamesa Renewable Energy (SGRE) said that is has begun operation of its electric thermal energy storage system (ETES), a milestone in the development of energy storage solutions, according to the company.

Natron Energy said that the California Energy Commission (CEC) awarded it a $3 million grant for “Advanced Energy Storage for Electric Vehicle Charging Support.” Natron will use the money to manufacture and install a high powered, long cycle life energy storage system at an EV Fast Charging station.

Iowa economic development officials are tentatively endorsing a tax credit for battery storage to complement the state’s wind and solar generation.

Go Electric Inc. is a specialist in energy resiliency solutions for microgrids and commercial & industrial customers integrating renewables and generators

Commercial property owners with existing energy storage systems, or owners considering implementing an energy storage system, may be able to benefit from a recent order by the Massachusetts Department of Public Utilities (DPU) allowing utility companies to pay customers who agree to rely upon their energy storage systems and dispatch the energy during peak events.

Gas peaker plants may be among the first casualties of a new Minnesota law requiring utilities to include energy storage as part of their long-range plans.

Finnish energy technology group Wärtsilä has signed an EPC contract for a 100 MW/100 MWh total capacity energy storage project in southeast Asia.

ENGIE Storage has announced it will supply and operate a 19 MW/38 MWh portfolio of six energy storage sites that will contribute to the Solar Massachusetts Renewable Target Program and participate in ISO-New England wholesale markets.

The Skeleton Creek project will be located in three Oklahoma counties

The four proposed central Virginia lithium-ion projects will cost about $33 million to build and offer 5-years’ worth of test data, according to Dominion.

South Australian energy storage company 1414 Degrees and Stone & Wood Brewing Company have agreed to undertake a feasibility study for the integration of 1414 Degrees’ electrically charged Thermal Energy Storage System (TESS-IND).

Energy Vault, the creator of a new way to perform utility-scale energy storage, announced that SoftBank Vision Fund (Vision Fund) invested $110 million in its Series B funding round. Energy Vault will use the funds to accelerate global deployment of its technology, which enables renewables to deliver baseload power for less than the cost of fossil fuels 24 hours a day, said the company. As part of the investment, Andreas Hansson, Partner for SoftBank Investment Advisers, will join the Energy Vault board of directors.

Under a 20-year agreement, AES will provide APS with the storage capabilities powered by Fluence’s Advancion platform.

Yesterday, energy storage company Saft said it delivered and installed a turnkey Energy Storage System to Bermuda Electric Light Company (BELCO). The system provides up to 10 MW power for spinning reserves and frequency response to maintain grid stability and has a storage capacity of 5.5MWh, said the company. The official ribbon-cutting ceremony was held on May 16.

Iowa economic development officials are tentatively endorsing a tax credit for battery storage to complement the state’s wind and solar generation.

Go Electric Inc. is a specialist in energy resiliency solutions for microgrids and commercial & industrial customers integrating renewables and generators

The Skeleton Creek project will be located in three Oklahoma counties

California recently joined other leading states, provinces, cities, and corporations around the world by setting an ambitious 100 percent carbon-free electricity target. It’s a landmark, not because California was the first, but because it is the biggest. The state ranks as the fifth-largest economy in the world.

Excitement over storing electricity, and expectations for new market rules in the U.S. promise great changes in energy. Instead of hype and speculation, this blog offers a preview of those market changes. For those who are waiting for FERC Order 841 to sort things out, ISO-New England has published something you might want to see.

2018 was another defining year for the lithium supply chain as the global population continued to make remarkable strides towards the implementation of clean energy and transportation. Although the clean energy and transportation industries are only in their early days, it has become apparent that renewables and electrification of transportation are an irreversible trend, one that has begun to disrupt many established industries.

The power industry is facing a nuclear power dilemma, according to a report published by The Union of Concerned Scientists. UCS assessed the economic viability and performance of nuclear power plants operating in the United States and concluded that the retirement of these plants will likely result in the adoption of coal and natural gas for baseload power generation, two energy sources that contribute to carbon dioxide emissions.

Yesterday, energy storage company Saft said it delivered and installed a turnkey Energy Storage System to Bermuda Electric Light Company (BELCO). The system provides up to 10 MW power for spinning reserves and frequency response to maintain grid stability and has a storage capacity of 5.5MWh, said the company. The official ribbon-cutting ceremony was held on May 16.

Herbert was joined by Mitsubishi Hitachi Power Systems (MHPS) and Magnum Development at the event to detail the Advanced Clean Energy Storage (ACES) project in central Utah. They called it the largest such energy storage project in the world.

Commercial property owners with existing energy storage systems, or owners considering implementing an energy storage system, may be able to benefit from a recent order by the Massachusetts Department of Public Utilities (DPU) allowing utility companies to pay customers who agree to rely upon their energy storage systems and dispatch the energy during peak events.

ENGIE Storage has announced it will supply and operate a 19 MW/38 MWh portfolio of six energy storage sites that will contribute to the Solar Massachusetts Renewable Target Program and participate in ISO-New England wholesale markets.

Toronto-based Hydrostor Inc., a leader in advanced compressed-air energy storage (A-CAES), has announced a A$30 million technology demonstration project at the former Angas Zinc mine in Strathalbyn, Adelaide.

The partners will work together to develop projects in Spain, the Middle East and South Africa. The projects could add several gigawatt hours of storage capacity by 2022.

Italy must more than double its capacity to store electricity if it wants to slash pollution from burning fossil fuels, the head of the nation’s power transmission network said.

Clean-energy visionaries have long argued that the world needs a better battery capable of selling skeptical consumers on electric cars and running the grid on renewable power. And yet the battery of the future—at least for the coming decade—will almost certainly be the battery of the past.

Through its exclusive distributor in China, Puxing Energy, NEC developed two 9-MW battery facilities providing frequency regulation for the Hang-Jin and Feng-Run power plants located in Ordos City, Neimongol Province and Tanshan City.

On Thursday, US Congressman from Pennsylvania Mike Doyle introduced a bill that would establish a federal investment tax credit (ITC) for energy storage. The legislation would allow energy storage project developers, both commercial and residential, to receive a 30 percent tax credit for large-scale, commercial-scale and residential-scale storage projects through 2021.

There are a total of about 530,000 potentially feasible pumped hydro energy storage sites worldwide, with a total storage potential of about 22 million GWh. These astonishing numbers come from a report recently released by Professor Andrew Blakers and other researchers with Australian National University’s RE100 Group.

Last Friday evening in Surprise, Arizona a storage facility owned by Arizona Public Service (APS) exploded, injuring four firefighters. Reporter for azfamily.com, Maria Hechanova, visited the scene yesterday and reported that the explosion happened while four hazmat firefighters from Peoria were working to extinguish a battery fire at the facility.

This week New York Governor Andrew M. Cuomo announced that $280 million of support is available for energy storage projects.

The 2.25 MW/4.5 MWh project will be situated in Johnson City, Texas. Aggreko software will manage the battery system, which will provide services into grid operator Electric Reliability Council of Texas.

Yesterday, energy storage company Saft said it delivered and installed a turnkey Energy Storage System to Bermuda Electric Light Company (BELCO). The system provides up to 10 MW power for spinning reserves and frequency response to maintain grid stability and has a storage capacity of 5.5MWh, said the company. The official ribbon-cutting ceremony was held on May 16.

Herbert was joined by Mitsubishi Hitachi Power Systems (MHPS) and Magnum Development at the event to detail the Advanced Clean Energy Storage (ACES) project in central Utah. They called it the largest such energy storage project in the world.

The energy storage resource is expected to help lower energy costs for National Grid’s customers in upstate New York

Siemens Gamesa Renewable Energy (SGRE) said that is has begun operation of its electric thermal energy storage system (ETES), a milestone in the development of energy storage solutions, according to the company.

Natron Energy said that the California Energy Commission (CEC) awarded it a $3 million grant for “Advanced Energy Storage for Electric Vehicle Charging Support.” Natron will use the money to manufacture and install a high powered, long cycle life energy storage system at an EV Fast Charging station.

Iowa economic development officials are tentatively endorsing a tax credit for battery storage to complement the state’s wind and solar generation.