OLA S1 E-Scooter

Ola eScooter

Ola S1 E-Scooter are the number one selling scooters in India in the electric 2 wheeler market. In 2023 Ola sold 252,647 units (till dec21). Ola S1 comes in three models: Ola S1 Pro, S1 Air and S1X. In this article we will see benchmarking of OLA battery pack for S1. S1 air and X … Read more

Mercedes AMG HPB80

Mercedes AMG HPB80 energy and power graphic

The Mercedes AMG HPB80 is a dielectric cooled PHEV battery pack. First introduced in detail by Mercedes in 2021 this battery pack is worth a more detailed review. We know a number of the specifications for this pack and hence can estimate others. However, we do not know the cell that is used in this … Read more

Rivian Max Battery Pack

The Rivian Max battery pack has been mentioned in many articles as 180kWh. However, Rivian have now released details of the upgrade and it is a cell upgrade from the Samsung 50G to the 53G. Summary Note: in addition it appears that Rivian have made some efficiency gains and hence the numbers are not completely … Read more

2021 McMurtry Speirling

mcmurty speirling vehicle

The 2021 McMurtry Speirling is perhaps even more impressive an electric vehicle than the Rimac Nevera. Note: this is a very limited benchmark with just a few known parameters. This does though show the approach used to look at what the pack configuration might be. Battery Specifications This post has been built based on the … Read more

2020 Rimac Nevera

Rimac Nevera see through CAD of chassis and components

The form of this battery is complex, however, this is a hypercar that can afford an expensive battery pack design. Pack Mass: Rimac claim that the cell to pack mass ratio of the Nevera is 67% [1]. They also state that it uses 6960 21700 cells and we know that these weigh 70g each +/-1g. … Read more

Base vs Side Cooling Cylindrical Cells

cylindrical cell base versus end cooling

Base vs side cooling of cylindrical cells is often brought up in online discussions and in many OEMs designing battery packs. We looked at this before within Thermal Conduction in a Cell, however, I think it is worth expanding this topic. The Tesla design cools the side of the cell and the Lucid Motors cools … Read more

LG INR 21700 M50

LG INR 21700 M50 has an NMC 811 formulation for the cathode and a Graphite-SiOx anode. It is in the 21700 cylindrical format. Key features Designed to meet Dimensions The diameter is given based on largest measurement at the top of the cell (Section A) Test data Capacity vs Temperature Discharge Temperature [°C] Energy [Wh] -10 … Read more

Cell Gas Pressure

Gases are generated in the cathode, anode and electrolyte during the formation and cycling of a battery cell. As this is a closed system the result is a cell gas pressure. What this gas is composed of, how it behaves and how it changes with State of Charge (SoC) and the cycling of the cell … Read more

Cylindrical Cell Electrode Estimation

Cylindrical Cell Electrode Estimation: An alternative geometric approach. Here we present a simple method for estimating electrode length in a cylindrical cell. The method is equally applicable to other formats since we make an estimation of the total active electrode area. Results require knowledge of one electrode Active Material (AM) chemistry, electrode porosity and thickness … Read more