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If you have specific requirements to battery size, temperature area, lifetime etc. we give recommendations on this based on newest knowledge.
The right battery choicePrice is often the most obvious difference on batteries. However, there is great difference between capacities at different operating conditions, quality, lifetime, self-discharge and safety. We help finding answers within all of this.
We offer test and counsellingIn the battery laboratory we characterize battery cells and battery packs at different operating conditions and climatic conditions. We can, for example measure the energy content, testlifetime, degradation and safety. We also offer advice if a lead battery is desired replaced with a lithium-ion battery.
Within the mobile area, we deal among other things with electric scooters, bikes and cars. We also undertake maritime tasks, tasks with stationary battery storage for solar cells and wind turbines as well as grid-connected battery storage systems.
We have a well equipped battery laboratory offering both standardized and customer-specific battery tests. Our specialists cooperate with chemical and motor engineering laboratories, so the battery pack characteristics, its inner chemistry and interaction with other components of the design can also be tested and analyzed by us.
How can Danish Technological Institute help you?
Thanks to the available infrastructure, it is possible to test and evaluate the performance of batteries in the same conditions as they would encounter in electric vehicle, grid support (e.g., frequency control, peak shaving etc.), or uninterruptable power supply applications. Furthermore, commercial, prototype, or home-made battery management systems (BMSs) can be tested in a safe and reliable environment.
Up to 58 battery cells (6V/ 50A) and two battery packs (100V / 100A) can be tested simultaneously using five state-of-the-art battery test stations. Furthermore, three electrochemical impedance spectroscopy (EIS) analyzers are available for dedicated tests. All the battery testing is carried out in twenty climatic and temperature chambers of various dimensions, which besides offering increased safety, allow reliable temperature control in the range -30°C to 80°C. Moreover, a word-class isothermal calorimeter is available for determining the thermal behavior of batteries.
Using a 16-cells battery emulator, commercially available or prototype BMSs can be tested and debugged in a safe environment.
The Battery Systems Test Lab can be used by academia and industry as a powerful tool for enhancing the understanding of behaviour of batteries in real-life applications. In fact, the lab allows for various activities, from battery electrical and thermal characterization to battery lifetime testing and lifetime estimation, which subsequently facilitates the battery screening process and development of optimized battery energy management strategies.
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Lithium Balance, the Danish Technological Institute and Aalborg University are in the process of developing a battery diagnostic tool to measure the life span of electric car batteries with support from the Energy Technology Development and Demonstration Program EUDP, FDM and Applus Car Inspection.
The goal is to find a method that can determine the remaining capacity of an electric car battery the same way you measure the capacity of the original horsepower left in an old gasoline or diesel car, explains The Head of Research and Development, Claus Friis Pedersen from Lithium Balance.
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The challenge of the project is to subtract electronic parameters over a chemical plant, which according to Claus Friis Pedersen, is harder than expected since it is very difficult to extract information from chemistry when it is measured electronically.
- Most people have tried to have an old mobile phone that can only hold power for 30 minutes even if the battery indicator shows a full battery, explains Claus Friis Pedersen.
In at way the challenges of the project can be compared to the development of fuel cells, which Denmark has now been developing for more than 15 years, explains Claus Friis Pedersen
According to Claus Friis Pedersen, one of the challenges will be to interpret the measurements that come out of the tests and transform them into a model for measuring the remaining life span of a battery. This is where the expertise of the researchers at the Institute of Energy Technology at Aalborg University play a role.
- One of the methods we are working with is to send a low current pulse into the battery during the charging sequence and, based on the voltage response, form a model of state-of-health (SoH), which is the health condition of the battery” explains lector Erik Schaltz from Aalborg University.
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Another method is purely based on software and consists of analysing the characteristics of the voltage by charging the battery with a constant current.
- We get different characteristics of the voltage curve depending on how the battery has previously been used, which we use in our analysis, explains Erik Schaltz.
The test of the batteries will take place at the Danish Technological Institute, which will measure both brand new and used electric cars.
DKK 12.5 million has been allocated for the development of the new tool, which has been named Batnostic. The main part of the financial support comes from EUDP who has funded DKK 7.5 million to the project. The remaining funds come from the parties involved in the project, with Lithium Balance and the Danish Technological Institute as main supporters.
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Since there is no similar instrument in the world so far it looks like Batnostic will be the first tool to measure the remaining useful life span of electric car batteries with reasonable accuracy.
- There is, as far as we know, no one else that has developed a similar diagnostic tool, says Claus Friis Pedersen.
According to Claus Friis Pedersen, the existing measurement instruments are far from accurate enough and cannot be used for hybrid cars, where the battery is never fully charged or discharged.
The new tool will make it possible for independent auto repair shops, used car dealers and car inspection stations to measure the remaining life span of an electric car battery correctly.
According to the project description only car manufacturers and authorised dealers can receive access to interpreting the data of the battery without affecting the warranty. This is a problem both for the owners of electric vehicles and the independent car repair shops, says the Technical Manager of Applus Car Inspection, Lars Kiholm.
- The producers keep their cards close to the chest when it comes to the life span of their electric car batteries, which is affecting both the independent workshops and their customers, says Lars Kiholm.
FDM''s Head of Department, Torben Lund is supporting the project.
- The battery is the most expensive unit in an electric vehicle and therefore crucial to the car''s resale value, he says.
For that same reason, FDM has supported the project with half a million DKK and are looking forward to getting the new tool out of its test centres.
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