from chemistry to pack
Every junction between two different metals in a sense-wire path is a small, unwanted thermocouple. If there’s a temperature difference across it, it generates a real voltage that a precision voltmeter cannot tell apart from the signal it’s supposed to be measuring. 1. A Junction You Didn’t Design Is Still a Junction Anywhere a copper … Read more
Capacity testing underpins virtually every other cell characterisation measurement. State of health calculations, degradation modelling, thermal management design, and pack-level energy budgets all trace back to a reliable baseline capacity figure. This page covers the standards that govern how that figure is established, the distinction between formation and lifecycle testing, the mathematics of capacity tracking, … Read more
If you are handling data from cell cyclers you will be aware of the different cell test data formats. The Problem Every cycler vendor has its own file format, its own column naming, its own unit conventions, and its own ideas about whether discharge current should be positive or negative. Maccor ships tab-delimited text with … Read more
If you want the best results in the laboratory it is really useful to learn from the experts: Solid state battery testing mould cleaning tips. Author: Anita Liu The Problem: Solid-state battery moulds are extremely sensitive to leftover powder, water stains, or surface scratches. Any of these can lead to poor electrode contact, low densification, … Read more
Learn how professional lithium battery manufacturers ensure pack Learn how professional lithium battery manufacturers ensure pack reliability through pre-assembly cell testing, voltage and internal resistance matching, and accurate sorting. Discover why these steps are essential for safe, long-lasting battery packs. Cylindrical Battery Cell Testing and Matching: The Essential Process Behind Reliable Lithium Battery Packs Author: … Read more
A Closer Look at SoC in Theory and Practice State of Charge (SoC) is one of the most used metrics in battery engineering, but also one of the most inconsistently defined. SoC is often described as the percentage of charge remaining in a battery, but what that percentage refers to depends heavily on how the … Read more
Authors: Marcus Tuchel, Prof. Emma Kendrick School of Metallurgy and Materials, University of Birmingham, Elms Rd, Birmingham B15 2SE Abstract Methodology Extrapolated OCV Li ion diffusion coefficient Conclusions and Future Work References Research Bio Marcus Tuchel is a PhD student in the Birmingham Energy Materials Group, under the supervision of Prof. Emma Kendrick and Prof. … 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
CompreCell Pouch x TekScan Sensor Author: rhd instruments GmbH & Co. KG Post based on an application note for which that and a full summary are now available: rhd-instruments.de magazine Introduction The pressure applied to pouch cell batteries is key to their performance and cycle life [1, 2, 3, 4]. One of two modes of … Read more
Cell component mechanical tests are extensive and required in order that a more detailed understanding of how the cells behave can be established. The battery cell is a complex: chemistry, electrical, thermal and mechanical system. Cycle ageing is seen as a deteriation in the chemistry of the cell, but should also be considered as a … Read more