## Maximum Cell Discharge Capability

Establishing the maximum cell discharge capability is difficult without understanding the design in detail. However, you can work towards establishing this limit with a number of measurements and calculations. The aim of this post is to describe that approach, the underlying physics, some of the measurements and calculations. First of all though we need to … Read more

## Pareto Frontier of the Ragone Plot

What battery packs are at the pareto frontier of the Ragone plot? With a database of over 300 packs we can plot power gravimetric density vs energy gravimetric density. Koenigsegg Regara The Koenigsegg Regera is a PHEV with a combined power of 1,119kW and uses a 4.5kWh 800V liquid cooled battery. The battery is designed … Read more

## Higher Voltage Packs

Why are we moving to higher voltage packs? We know that the battery cell is not a perfect current source as it also has an internal resistance. Symbolically we can show a cell with the internal resistance as a resistor in series. Rint is the DC internal resistance, sometimes abbreviated as DCIR. The DCIR is not … Read more

## Tata Nexon EV – Prime and Max.

India’s number one selling EV in 2022. Tata Nexon EV Prime 30.2 kWh and Max 40.5 kWh battery pack benchmarking.

## Battery Pack Ragone Plot

Battery pack Ragone plot is power density versus energy density. There are a number of key battery metrics and this one is great to see where a design sits on the Power vs Energy Density Curve. Note that the power is the peak power of the pack available for 10s. You could also plot the … Read more

## Current Limit Estimation

There are a number of reasons to estimate the charge and discharge current limits of a battery pack in real time: Hence this is a key function of the Battery Management System (BMS). The difficulty is that the current limits are dependent on a number of factors, for the cell alone we should consider the … Read more

## Engineering Empty Space: Tailoring Battery Electrodes for Ion Transport

Author: Anton Resing The cathode layer in a lithium-ion battery is a composite of solid charge storing particles, a polymeric binder, and a conductive additive. Together, they are well dispersed in a solvent and spread like paint on a conductive substrate, an effective and pleasingly simple solution that works across various chemistries and cell designs. … Read more

## Electric Vehicle On Board Charger

Current from the Grid (AC) goes through EVSE (Charging Station Either Level 1 or 2) through a connector to the On Board Charger. The Onboard Charger rectifies or converts the current into DC and sends it via the Battery Management System (BMS) to the Battery Pack

## Types of EV Charging Connectors

Different types of chargers by their ratings – Power (kW), Volt (V), Ampere (A), Range based on 7km/kW, Time to charge (For a 60 kW EV), Locations (whether Home, Work, Public) and Region.