from chemistry to pack
Author: Sebastian Kawollek A look at this paper and how it compares to what we see in the field. Xu J, Li H, Hua S and Wang H (2025) Experimental investigation of grid storage modes effect on aging of LiFePO4 battery modules. Front. Energy Res. 13:1528691. Introduction: To investigate the degradation behavior of energy storage batteries … Read more
Specification sheets and battery cell lifetime is always about capacity loss, the percentage of the original capacity in Ah available versus number of cycles and time. However, the range of your vehicle and how long your battery can support your house for is dependent on the amount of energy available. Hence this paper caught our … Read more
Whether we are storing cells or packs we want to reduce the capacity loss vs time in storage. Battery cells are an electrochemical system that ages whether being used or just stored on a shelf. The ageing when in storage is termed Calendar Ageing. The calendar ageing results in capacity loss and an increase in … Read more
Where to start with the task of developing a lifecycle test procedure. Battery cell ageing is such a complex subject that it makes it difficult to know where to start. One of the first things to do is to break the problem into Calendar and Cycle Ageing. Now we know we are going to be … Read more
Is there a relationship between Cycle Life and Energy Density? This is a mix of chemistry, age, size and manufacturers. Hence a lot of other information mixed into this, but there is a trend. Adding trendlines might be generous, but what we can see is that low energy density cells range in cycle life from … Read more
What is Remaining Useful Life (RUL)? Remaining Useful Life (RUL) is a key function declared by the battery management system. As per the title it gives you the remaining predicted lifetime of the battery based on its usage and degradation to the failure threshold [1]. It represents the period from the observation to the end of life … Read more
Attia et al [1] also describe six mechanisms/pathways that can produce the “Knee Point”: The impact of this nonlinear degradation in cell capacity depends to some extent on the architecture and application, but includes: This post has been built based on the support and sponsorship from: Eatron Technologies, About:Energy, AVANT Future Mobility, Quarto Technical Services, TAE Power Solutions and The Limiting Factor. … Read more
In any battery pack design it is only as strong as the weakest link [4], one bad cell or group of cells in the series string will control the total power and energy available from the pack. This means it is important to match the cells and to keep them balanced throughout the lifetime use … Read more