HESS Concept & Core Battery Technologies

We propose the combination of high power and fast response performant lithium ion battery based on LTO and an Aqueous Organic Redox Flow batteries, free of metals, as an environmentally friendly solution to be the energy supplier workhorse of this hybrid configuration.

In HESS, the high power efficiency and fast response from LTO launch and facilitate the use of the AORFB energy capacity, allowing AORFB to work in the maximum efficiency working points making profitable the investment made in this hybrid system and making it more sustainable. AORFB extends the storage capacity of the LTO, resulting in a final system able to cover a great part of the requirements that an energy storage system might have, saving investment and wining performances. From a market point of view, it is so possible to downsize the overall battery system (reducing the investment cost) without losing the performance required for such an application.

This combination is producing the best economic case comparing with the efficiencies and economic values of each one of battery types, while prolonging the life expectancy for both types of batteries. Capex and stored kilowatt-hour cost are reduced and operative range is extended in terms of services offered, storage time, peak energy and power releasable, working temperature accepted.

Optimized LTO technology

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LTO battery technologies are well recognised in terms high features in lifetime, safety and cycling at high power densities. However, LTO chemistry is based on titanium oxide anode, which provides superior performance especially in avoiding thermal runway events but shows a higher cost with respect to other Li-Ion technologies.

To reduce the investment cost, it is possible to push the ratio power/energy through the development of better cooling methods thanks to an appropriate thermal management strategy. To obtain a maximum power output from lithium batteries (LiBs), it is necessary to control the temperature, which is known to directly affect the performance and life of LiBs. The increase of temperature is caused by the heat generation during charge and discharge cycles. A battery thermal management system high operating temperatures lead to safety issues, thermal runaway, and electrolyte performance degradation at extremely low temperatures of lithium-ion batteries. Lithium titanate battery produced by Toshiba is well known for its wide range of temperature operation (-30°C-+55°C) assuring a long lifetime. In the range of -10°C-+35°C the behaviour of the battery is considered ideal. A Battery Thermal Management System will be developed to maintain the battery in ideal conditions, while controlling temperature increase below 45°C, when 5C discharge current occurs. This progress allows to achieve a powerful battery (>20% of the current one) and reducing the investment cost by downsizing the battery system, with respect a certain reference application.

This will allow to obtain the same energy content of the battery module with an increased power capability without changing the chemistry and the existing technology platform.

Optimized AORFB Technology with better environmental performance

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A set of improvements can be obtained with the combined use of the two storage system such as stabilization of the output coming from intermittent renewable sources, compensation of both low and high frequency power fluctuations, increase in overall lifespan and efficiency by choosing proper algorithms (which can exploit best working regions for both system), efficient and fast-response frequency regulation for both on- and off-grid systems, fast and accurate voltage regulation under unbalanced load conditions.

Further that, the advantages of the combination will be optimized by proper sizing of the overall system. In HESS, the high-power efficiency and fast response from LTO launch and facilitate the use of the AORFB energy capacity, allowing AORFB to work in the maximum efficiency working points making profitable the investment made in this hybrid system and making it more sustainable. AORFB extends the storage capacity of the LTO, resulting in a final system able to cover a great part of the requirements that an energy storage system might have, saving investment and winning performances. From a market point of view, it is so possible to downsize the overall battery system (reducing the investment cost) without losing the performance required for such an application.

Our HESS battery prototype will be based on eco-friendly design to ensure sustainability. This process includes a complete Life Cycle Analysis contrasted by means of an environmental impact assessment. Recyclability will be certified by industrial leaders of the sector. HYBRIS is aimed to contribute to the promotion of the implementation of environmental principles in the research, investigation, characterisation and engineering solutions, which should encourage the improvements in the overall environmental performance of Hybrid cell/Stack system.

The Hybris Approach

A set of improvements can be obtained with the combined use of the two storage system such as stabilization of the output coming from intermittent renewable sources, compensation of both low and high frequency power fluctuations, increase in overall lifespan and efficiency by choosing proper algorithms (which can exploit best working regions for both system), efficient and fast-response frequency regulation for both on- and off-grid systems, fast and accurate voltage regulation under unbalanced load conditions. Further that, the advantages of the combination will be optimized by proper sizing of the overall system. In HESS, the high-power efficiency and fast response from LTO launch and facilitate the use of the AORFB energy capacity, allowing AORFB to work in the maximum efficiency working points making profitable the investment made in this hybrid system and making it more sustainable. AORFB extends the storage capacity of the LTO, resulting in a final system able to cover a great part of the requirements that an energy storage system might have, saving investment and winning performances. From a market point of view, it is so possible to downsize the overall battery system (reducing the investment cost) without losing the performance required for such an application.

Our HESS battery prototype will be based on eco-friendly design to ensure sustainability. This process includes a complete Life Cycle Analysis contrasted by means of an environmental impact assessment. Recyclability will be certified by industrial leaders of the sector. HYBRIS is aimed to contribute to the promotion of the implementation of environmental principles in the research, investigation, characterisation and engineering solutions, which should encourage the improvements in the overall environmental performance of Hybrid cell/Stack system.