Inputs to Pack Sizing

cyantron modules, bms and packs

Lets look at the inputs to pack sizing, what do we need to know in order to size a pack? Usable Energy [kWh] Discharge C-rate or power [Crate or kW] Ambient temperature [°C] Minimum voltage [Vmin] Maximum voltage [Vmax] Cooling power [kW] At the early stage you don’t need to think about total energy, concentrate … Read more

Modular vs Dedicated BEV Platform

modular vs dedicated BEV platform

The modular vs dedicated BEV platform is an interesting problem facing automotive OEM’s as they balance their need to produce Internal Combustion Engine (ICE) vehicles and Battery Electric Vehicles (BEV). The trouble is we are in a world that still wants both vehicle options and vehicle platforms are expensive. Modular Platform One body design and … Read more

Pack Generations

battery pack generations

When we look at automotive battery pack design there have been a number of pack generations. The general theme is to simplify and hence reduce the cost. Initially we saw packs built from small modules of around 12 cells. The next step in pack generations is possibly going to be a cell to vehicle design. … Read more

Nissan Leaf

2015 Nissan Leaf Battery

The Nissan Leaf is perhaps the iconic original OEM BEV. Therefore, interesting to see how it performs against the competition over the years. The pack gravimetric density versus year of introduction is an interesting plot. Arguably the energy density should be outstanding as these packs are passively cooled. However, they are also conservative with respect … Read more

Cell to Pack

Cell to Pack is all about reducing cost and increasing the volumetric density of battery packs. This is primarily aimed at road vehicle battery design. Conventional battery pack design has taken the form: Cell -> Module -> Pack This means we add material to make the module strong enough to be handled, it needs fixings … Read more