Deep battery knowledge

3 May 2022

Approaches to battery modeling

In our everyday life, we are surrounded by increasingly complex products, which makes understanding these and their interaction within other systems more complicated. Nowadays, battery systems in electric vehicles consist of numerous, individual battery cells connected in series and parallel, with each battery cell containing various solid and liquid materials and other supporting components. To understand how these complex systems will behave, we build models or replicates, also known as “digital twins” of these complex systems to mimic their behavior and leverage the computational power to perform the required calculations.

20 January 2022

Streamlining e-bus warranty discussions

A lot has happened in the world of electric buses over the past year. Many new projects have been announced or started. The early adopters – those that started introducing electric buses into their fleets four or five years ago – can offer helpful insights to the future for many. Over the past couple of months, ViriCiti and TWAICE have worked closely with such an early adopter on how to integrate data-driven decision making – focusing on batteries – to avoid timely and costly warranty discussions.

3 June 2020

The Power of Signalling

Autovista Group, TÜV Rheinland and TWAICE have teamed up to explore the potential impact of Battery Health Reports (BHR) on remarketing success of the battery electric vehicle (BEV) in a new whitepaper. Besides age and mileage, driver profile has a major impact on how long a battery lasts. In the absence of documentation of how a driver has treated the battery, residual value formation remains below its full potential.

18 May 2022

Residual values

This article discusses residual values, and how transparency into battery health is crucial for improving the residual values of electric vehicles.​ 

30 March 2022

BMS vs Analytics

Knowing the State of Health (SoH) of a lithium-ion battery in an all-electric vehicle is the fundamental basis for electric vehicle maintenance and battery warranty. Finding out the battery health at any point in a battery’s life is necessary for making operations profitable and safe, as well as enabling business models such as BaaS (battery as a service) or circular economy approaches.

24 March 2022

Case Study VERBUND

Learn how VERBUND increased profitability of battery energy storage systems by incorporating battery aging into its operating strategy

22 February 2022

Maximizing the value of battery energy storage systems

The use of energy storage systems is growing exponentially as costs decrease and deployment options increase.  Among currently available storage systems, batteries based on lithium-ion chemistry can provide a significant amount of this flexibility due to their high power and energy density and relatively low cost per unit of energy.  However, several challenges must be overcome to profitably operate a battery energy storage system (BESS) over its lifetime.  Battery analytics and smart algorithms can help provide insights to make the right decisions.  

18 February 2022

TWAICE Vision Conference Report

Software is indispensable for a battery-driven future: Economic efficiency and sustainability in the battery sector are inseparably linked to software. Beginning of February battery software provider TWAICE, hosted a conference on exactly this topic. A conference report now highlights the main findings of the event.

18 February 2022

International Battery Day

International Battery Day is celebrated every year on February 18, the birthday of Italian physicist Alessandro Volta, who introduced the first battery in 1801. Quite simple in design, his first attempts consisted of rudimentary objects: thin strips of copper, cardboard and zinc, separated by damp leather. Volta’s conducting element was – unbelievably – his own tongue. This Friday, the battery reaches the grand old age of 221 years. And with more car buyers now opting for electric, it seems a good opportunity to recognize what batteries have done for humankind, and the advantages their technology offers the mobility and energy spaces.

17 January 2022

Three e-mobility trends 2022

The goal to cease production of combustion engines by 2030 means that the importance of renewable energies, energy storage systems and e-mobility to sustainability and environmental awareness continues to grow. Where are we right now and what trends are emerging for 2022?

6 August 2021

Battery simulation models

Mercedes-Benz is just the latest in a long line of companies committing to an all-electric product line-up. Central to this transition in the mobility space is the lithium-ion battery. Outside the automotive industry, these batteries are already a key technology. But while the battery is a powerful enabler, it can also be an Achilles’ heel. We talked to TWAICE battery modeling engineer Goku, who explains the most pressing issues.

22 March 2021

Predictive battery analytics in the energy sector

Battery storage is a fundamental part of the energy sector. Batteries, however, are complex systems. Deriving the maximum profit from them without incurring any additional risk is the overarching goal of most energy operators. This is where battery analytics can help.

11 February 2021

E-Bus Battery Optimization

The e-bus market is already moving fast in 2021. Established bus manufacturers are setting the pace. E-bus manufacturers are currently facing a plethora of questions and uncertainties. Major challenges include the development of the highly complex batteries, warranty management, sustainable fleet management and the issue of battery reuse and recycling.

15 December 2020

E-Bus Fleet Management

They may not catch your eye like the Tesla in the neighbor’s driveway, but increasingly more public transport vehicles are going electric. In 2019, more than 1600 electric buses were introduced in the EU, 187 of which in Germany – and the trend is on the up.

18 November 2020

Electric Vehicle Recalls

Numerous recent recalls showed how much risk is associated with the most important competent of the emission-free mobility. The battery is a highly complex piece of technology that must be tightly analyzed not only during the development but also during operation.

11 May 2022

Modeling capacity fade of li-ion batteries

Aging models are important tools to optimize the application of lithium-ion batteries. In this work, we show that the CAP-method models capacity fade more accurately when applied to dynamic cyclic aging tests with periodically changing mean state-of-charge, depth-of-discharge, ambient temperature and discharge rates for a commercial NCA cell with a silicon-doped graphite anode.

2 September 2021

Quantifiability of Cell-to-Cell Variations

Motivated by the question of why impedance variation is consistently reported to be higher than the variation of other parameters, we show that measuring inherent parameter variations caused by production tolerances is superimposed by effects of an imperfect measurement setup.

2 September 2021

Combining EIS and time-domain data

This work proposes a method to combine time-domain and frequency-domain measurement data for parameterization of RC elements by exploiting the full potential of the distribution of relaxation times (DRT).

23 November 2020

Impedance Research Paper

Impedance is an important characteristic of lithium-ion batteries since it directly influences their power capability. However, battery impedance is highly dependent on the operating condition and increases over the lifetime of the battery, due to degradation of the latter. Continuous tracking of the impedance can hence provide meaningful insights into the aging status of a battery.