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Report

Teaser, summary, work performed and final results

Periodic Reporting for period 1 - HiVOLT (HIGH-VOLTAGE LITHIUM STORAGE - secure + efficient battery storage solution of the next generation)

Teaser

Summary

The project HiVOLT describes the envisaged market introduction of a new stationary battery storage system, which significantly increases the application possibilities of battery storage and achieves an unprecedented price-performance ratio. The solution is based on a new technology, the high-voltage storage technology, which significantly revolutionizes the current storage approach. Until now, high-voltage technology had only been introduced in small quantities in one vehicle class (upper class) in the automotive sector. We are now taking the step towards stationary application for the broad mass market. Instead of the low voltage range (50 V alternating voltage), the high voltage lithium storage of the TESVOLT works in a voltage range of 700 V. This promises a significant increase in efficiency and cost reductions compared to state-of-the-art technology. Savings result from the elimination of transformers and reduced system costs due to lower currents. This makes it possible for stationary battery storage to be so inexpensive in the future that battery storage can be used in various energy areas.

This technological leap is made possible by several TESVOLT innovations. In high-voltage storage technology, for example, several battery storage units must be connected in series - highly complex with appropriate regulation of the currents and voltage of individual battery modules. TESVOLT has developed and patented a unique high-voltage battery management system - the ABO. It can detect differences in the high-voltage battery system and optimize each individual battery cell within a battery module via cell balancing. The other innovations in high-voltage lithium storage are the static switch, the built-in prismatic cells and the modular design of the automatically mountable battery modules. All in all, these innovations offer outstanding cost-effectiveness compared to state-of-the-art technology.
The market for this new generation of stationary battery storage products is gigantic. The higher the proportion of volatile energy fed into the power grid, the greater the growth in electricity storage demand. All over the world, energy grids need flexibility in order to compensate for fluctuations in the supply of wind and PV. In the future, battery storage systems will become system-relevant for all energy networks with a high proportion of renewable energies. Battery storage systems are a key technology in the energy revolution - and can be used for a wide variety of applications.

The basic objectives of the HiVOLT project are as follows:
â€¢ The high-voltage lithium storage serves to provide energy system services. This includes the stabilization in electricity grids, the balancing of generation and consumption
â€¢ The high-voltage lithium storage provides an intelligent power grid and allows the use of higher proportions of renewable energy sources in the energy system.

The technical and commercial objectives defined for the first year were largely achieved. The product was launched in many European countries. International projects in Asia and Africa complement this. The following concrete progress was made:

1) An effective and environmentally friendly power generation is enabled and offered to our target users.;
2) Regarding fluctuating power generation, maintaining the grid frequency is another important task that our battery storage can solve.
3) Smoothing of peak load curves both in production and on the part of consumers
4) Strengthen the competitiveness of battery storage through lower prices and environmentally friendly energy production. Automated production has drastically reduced investment costs per kWh and reduced specific electricity storage costs

Work performed

The first project year included both technological and commercial tasks. Technological activities include:

â€¢ Design suitable for series production: Revision of the design of the system modules (APU, ABO, battery module) of the high-voltage lithium memory â€“ completed
â€¢ Revision of software for automatic and fast commissioning and automatic remote operation for monitoring the memory status for a quick overview for service, resulting in short response times from service â€“ completed
â€¢ Introduction of an integrated production planning system with partial automation - completed, roll-out of production in second project year
â€¢ Development of the semi-automated production process - planning carried out, implementation in the 2nd project year

The market launch in the first project year was also driven forward commercially. Global market entry has taken place. The commercialization strategy was further developed, and numerous communication and dissemination activities were successfully completed. In addition, several partners were won for national and international sales. The business model was further developed to establish an OEM business in addition to direct business with specialist partners and energy suppliers.
The project management team was responsible for the efficient implementation of the project and for all important tasks such as project monitoring (schedule and budget), administration of administrative, contractual and legal aspects as well as communication with the EASME representatives. Successful progress in the first year of the HiVOLT project has contributed greatly to achieving the overall objectives originally set.

Final results

The technology of the TESVOLT high-voltage lithium storage is based on the interaction of a high-voltage battery with an adapted inverter. The high voltage level of the battery allows direct connection to the inverter, reducing conversion losses and eliminating the need for an expensive and heavy transformer. Instead, the TESVOLT battery has a simple step-up converter that converts the voltage from low to high voltage. The advantage over conventional storages lies in the significantly lower system costs of more than 50 % in power electronics. Furthermore, the approach leads to a decoupling of the further development of battery and power electronics. The inverter does not have to be adapted to the development of the battery and vice versa. There are also no more restrictions on the battery voltages.

In the past, the consequences of a change in the technology approach have already been experienced with PV inverters. With the possibility of increasing string voltage, PV inverters have become significantly cheaper and more efficient. Today there are almost exclusively transformerless PV inverters. At the same time, we expect that by using a transformerless high-voltage inverter and the corresponding cost savings of more than 50 %, high-voltage technology will prevail on the market.

With this new product, we offer a product with specific added value compared to state-of-the-art technology. The efficiency of the high-voltage lithium storage is outstanding and is determined by three factors: 1. charging cycles, DoD, efficiency (= cost of stored electricity), 2. investment costs, 3. system costs.