Components and Functions

sub-system and functions of a battery pack

A good way of thinking about battery pack design is to look at components and functions. Even better if you have the luxury of having component owners and independent function owners. I think in terms of the five function headings: This post has been built based on the support and sponsorship from: Eatron Technologies, About:Energy, AVANT Future Mobility, Quarto … Read more

Electrode to Pack

24m battery pack known as ETOP

We have seen Cell to Pack and Cell to Body pack designs, now we are seeing talk of Electrode to Pack. The first to talk about this perhaps are 24M Technologies with what they have trademarked as their ETOP system. In lithium cells with a liquid electrolyte this arrangement would be an issue as the … Read more

12V System Voltage Limits

12v battery system limits

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

Rolls-Royce Spirit of Innovation

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

IP Ratings

2015 Nissan Leaf Battery

IP Ratings or Ingress Protection ratings are designed to rate and grade the resistance of enclosures of electric and electronic devices against the intrusion of dust and liquids. Plus how easy it is for individuals to access the potentially hazardous parts within the enclosure. The IP rating used for battery packs depends on the specific … Read more

Joining Techniques for Pack Enclosures

Author: David G. Kilburn & Nigel Taylor As I posted the other day, there are a lot of “boring” battery topics that often get overlooked and producing the battery housing (sometimes referred to as battery tray or box) is no exception! To house a battery you need a high quality, leak proof container that can … Read more

Cells in Parallel

resistance in busbar joints

When connecting cells in parallel all of the negative terminals are connected together and all of the positive terminals are connected together. The capacity of the parallel group is the sum of the capacity of the cells. Hence three 5Ah cells connected in parallel will give a total capacity of 15Ah. 3 cells connected in … Read more