Expert Interviews

TWAICE and TÜV Rheinland Talk About the Need for Battery Assessment and Their Cooperation

TWAICE supports enterprises across industries with predictive battery analytics software based on digital twins. The company empowers its customers to develop and use battery systems more efficiently and sustainably while making them more reliable and durable. Precise predictions of battery conditions and aging significantly optimize battery development and use. Exact determination of current condition also enables certification of batteries for reuse and 2nd life. 

TÜV Rheinland is a global leader in independent inspection services, founded 145 years ago. The group maintains a worldwide presence of more than 20,000 people; annual turnover is nearly EUR 2 billion. The independent experts stand for quality and safety for people, technology and the environment in nearly all aspects of life. TÜV Rheinland inspects technical equipment, products and services, oversees projects, and helps to shape processes and information security for companies. Its experts train people in a wide range of careers and industries. To this end, TÜV Rheinland employs a global network of approved labs, testing and education centers.


ees International: Thank you very much for this interview. TWAICE is a young company with an impressive development in the past one-and-a-half years. What is the idea of TWAICE and what is your mission?

LH: Thank you very much for the opportunity to discuss TWAICE and our collaboration with TÜV Rheinland. At TWAICE, we want to provide transparency for the Li-Ion battery. Manufacturers and users alike struggle with the complexity and the degradation, also called aging, of batteries. We support them during the development and operation of battery powered products such as electric vehicles. Some of the key issues here are: What can my battery do now, how far does it get me and how long will it keep doing that. This is the topic we are addressing with the TÜV Rheinland.

You did mention the age of our company. Of course, when talking about the short history of TWAICE, one must also consider the five years of research and development that went into the technology during the research from Michael Baumann and Stephan Rohr at the Technical University of Munich. I think this was one of the reasons why Dr. Obermair already approached us last summer. Since then, we have been working on this cooperation.

ees International: Dr. Obermair, what were the deciding factors when you decided to cooperate with TWAICE?

KO:  I perceived Twaice as a very innovative company. They are a strong team with an unbelievably large battery know-how and access to 5 years of experience in the battery diagnosis of Li-Ion batteries. They recognized the key e-mobility issues early on and found a partner in us to address them.

ees International: Why is the cooperation and such an assessment important?

LH: When you are considering buying a used electric car, the battery will be your primary concern. Once you approach the end of the warranty period, say 160 000 km or 8 years, which seems to become industry standard now, there is a lot of insecurity connected to the battery performance.

KO: The replacement of the vehicle battery can quickly cost several 10,000 euros. An independent assessment of this valuable asset is not only necessary if the residual capacity is no longer sufficient for use in the vehicle, but also in the event of damage. Here, owners and insurers must know exactly what costs arise and whether only individual modules or the complete battery pack are affected.

ees International: What role does each of the partners play in the cooperation?

KO: We have decades of experience in the field of vehicle evaluation and know the market very well. We add value through our battery testing laboratories and global presence in this partnership.

LH: The beauty of this collaboration is that the benefits of each partner within the partnership come very naturally. TWAICE has a very strong footing in the battery analytics. Our software has been tested by multiple clients and proved to be very accurate and market leading. Combining this battery and software expertise with the aforementioned resources and skillset of TÜV Rheinland, we can create huge added value for our customers, be it end users, OEMs or financial service institutions.

ees International: What will be the process for an individual to sell their electric or hybrid car, what kind of infrastructure is needed?

LH: Well, I don’t think that selling your car will change dramatically. When you are currently looking for scratches in the paint and checking the maintenance record of the vehicles, with electric vehicles you will be checking the use history, current condition and remaining lifetime – with TWAICE obviously!

KO: For vehicles with a traction battery, we think the rating will be a bit more complicated. The battery value depends enormously on the user behavior and it is only indirectly possible to draw conclusions about the capacity over age and mileage. Sellers, buyers and insurers need more security here.

ees International: Considering successful tests; what is your outlook on the future of electric mobility in Germany and worldwide?

LH: We generally see the extreme acceleration that electric mobility is taking around the globe. I personally believe that our cooperation with TÜV Rheinland can deliver the crucial component to solve some of the remaining issues for the end user and financial service companies – what to do with used batteries?

KO: The trend towards battery electric vehicles and plug-in hybrids is on the rise. These propulsion technologies are needed to meet the political requirements and are supported by appropriate incentives. However, in order to gain even wider acceptance and thereby secure the future of the technology, we believe that it is essential to be able to identify the capacity of the battery in vehicles or energy storage devices at any time and thus to provide information about the value and the usage period.


Thank you very much for the interview, Mr. Hinrichs and Dr. Obermair.


More info:


The interview partners:


Lennart Hinrichs

Commercial Director



Dr. Karl Obermair

Program Director Future Mobility

TÜV Rheinland


The ees International Magazine is specialized on the future-oriented market of electrical energy storage systems, not only from a technological-, but also a financial and application-oriented point-of-view. In cooperation with ees Global, the ees International Magazine informs the energy industry about current progress and the latest market innovations.
Contact: Xenia Zoller - zoller(at)