from chemistry to pack
We often see stepped fast charge limits as shown in this BMW iX3 graph. Often the result of a limited test regime applied by the cell supplier (in this case CATL) to establish the maximum charge current for the cell. These limits are them applied by the BMS team and without more data they have … Read more
As you charge a cell it expands, when you discharge a cell it contracts and as the cell ages over its lifetime we see a continuing cell expansion. Thus the cell expansion can be divided into: The reversible cell expansion comes from changes in graphite layer spacing associated with different graphite-lithium intercalation compounds induce reversible … Read more
Niobium in batteries looks at the high level addition of this element and some of the claimed and measured improvements to the battery cells as a result. Niobium-Based Anode Toshiba Super Charge ion Battery (SCiB) [5] are developing a Niobium Titanium Oxide anode that will have improved performance over the current LTO products: Downside: Cycle … Read more
When looking at the key parameters in fast charging a battery pack it is worth looking at the complete system. Also, it is good to look from the cell at atomic scale through the thermal system design to the charging algorithms and handshakes [1]. The drive for a 10 min fast charge to reach 80% … Read more