The bottleneck of battery technology has always been one of the important reasons restricting the development of new energy vehicles. How to make breakthroughs in battery technology to improve the cruising range of electric vehicles is a major challenge facing automakers. According to reports, Germany ’s ThyssenKrupp and Daimler are developing electric vehicle bipolar batteries based on lithium-ion technology. Such optimized batteries can make electric vehicles have a maximum cruising range of 1,000 kilometers, effectively solving the current Lithium battery has insufficient battery life.
The participating companies in this technology are Thyssenkrupp System Engineering (thyssenkrupp System Engineering), Daimler AG, IAV GmbH and Fraunhofer Co-sponsored by the Fraunhofer Institute for Ceramic Technologies and Systems IKTS, the battery project is called EMBATT-goes-FAB.
The project aims to develop a large planar lithium-ion battery directly integrated into the chassis of the vehicle, that is, a bipolar battery for electric vehicles.
By researching large-scale manufacturing technology, promoting the industrialization of bipolar batteries and improving the cruising range of electric vehicles (cruising range refers to the maximum driving range of electric vehicles after being fully charged), the project can provide a more solid foundation for the development of electric vehicles.
This project was also sponsored and supported by the Federal Ministry for Economic Affairs and Energy.
Schematic diagram of bipolar battery
Similar to fuel cells, bipolar cells consist of stacked electrodes connected in series. However, the difference between a bipolar battery and a traditional lithium ion battery is that the electrode is bipolar, that is, the active materials of the cathode and anode of the battery are applied to a common electrode carrier.
In addition, the packaging of bipolar battery cells is also different from traditional lithium-ion batteries. The individual lithium-ion batteries are no longer individually packaged in aluminum cases, but are stacked on each other in a large area.
Its unique stacking structure eliminates the need for housing components and connecting elements. The released space can be used to fill more active materials, help the battery store more energy, extend the cruising range of electric vehicles, and save the cost of electric vehicles.
Bipolar battery
As a new generation battery system, the bipolar battery can provide up to 1,000 kilometers of electric cruising range.
In this project, the collaborating companies will combine their respective fields of expertise to meet technological challenges: ThyssenKrupp Automotive Systems Engineering is responsible for expanding assembly technology, and the Fraunhofer Institute for Ceramic Technology and Systems is responsible for lithium-nickel -Production of improved bipolar electrodes with manganese-cobalt oxide and graphite as storage materials. IAV is responsible for the battery monitoring system and Daimler is responsible for safely simulating bipolar batteries.
It is reported that the project will begin the quantitative production of bipolar batteries after the completion of the first phase. The application prospect of the bipolar battery used in the project is bright, not only for electric vehicles, but also as a decentralized energy storage system in photovoltaic systems.
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