from chemistry to pack
When we look at the battery versus system voltage we have to remember that these are working together. In fact we have to look at the complete system and all components to ensure they can work together over the maximum and minimum voltage range. This will normally be the maximum charge voltage and the minimum … Read more
The 12V system voltage limits are quite well defined by the automotive industry as there is a need for all of the components to survive. Based on this LV 124 sets out Vmin and Vmax limits for different classes of function. Vmin Vmax Description 6V 16V For functions that must retain their performance during the … Read more
Peak vs continuous power is a recurring question across the electrification space. We need to deliver a repeatable amount of power for the user to have confidence in the machine and we need high power numbers to deliver the brochure wow factor. The transient peak power works well for a number of vehicle applications. However, … Read more
A look at the electrified aircraft propulsion targets. NASA state in their November 2021 presentation that they have the following requirements for the battery pack: The targets at pack level are rather tough: The gravimetric energy density plotted versus total pack energy shows that the automotive packs are currently plateauing around 180Wh/kg. The roadmap to … Read more
The cell to pack mass ratio is a simple metric to calculate and gives you an idea as to the efficiency of your pack design. This is simply the total mass of the cells divided by the mass of the complete battery pack expressed as a percentage. The larger the percentage the better: An interesting … 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