Which solutions of battery systems for EV and HEV have the most potential to guarantee passenger safety? What are the advantages of lithium ion batteries concerning safety issues? Which procedures do car manufacturers have to implement battery testing? To answer some of these questions Dario Canevazzi, Battery Systems Component Engineer at Jaguar Land Rover along with John Birch, Functional Safety Technical Specialist at AVL Powertrain UK Ltd. made a presentation at IQPC's Automotive Battery Safety Summit on the topic of: "High voltage battery safety analysis from a vehicle-level perspective" Want to learn more? Download the presentation HERE: http://bit.ly/Birch_PP The presentation goes into detail about the following key issues: • Hazard identification at vehicle-level • Electrification and safety challenges using the cradle to grave approach • Mapping of vehicle-level hazards to high voltage battery behaviour Visit also our Conference about Battery Safety: http://bit.ly/Register_BS

1. The only international event focusing on the
safety of advanced automotive batteries
2nd International Conference
A u t o m o t i v e
From cells to integrated battery systems: Safety first!
01 – 03 December 2014 | Berlin, Germany
At last year’s Battery Safety Summit, John Birch of AVL Powertrain UK Ltd and Jaguar Land
Rover’s Dario Canevazzi gave a presentation titled ‘High Voltage Battery Safety Analysis From a
Vehicle-Level Perspective.’
Please enjoy viewing this exclusive presentation as well as an interview with the speakers.

2. “Safety is a vehicle-level property and therefore a holistic and a systematic top-down
approach is required in order to understand and manage battery safety performance and its
interaction with the vehicle.”
John Birch is a Functional
Safety Technical Specialist
with AVL Powertrain UK Ltd
Dario Canevazzi is a Battery
System Engineer with Jaguar
Land Rover, UK.
The search for a clean and green technology for the transport sector plays an important role
to lower emissions and the consumption of fossil fuel. Which developments and solutions of
battery systems for EV and HEV have the most potential to guarantee passenger safety,
from your point of view?
From a technical perspective, the solutions expected to help guarantee passenger safety are
the development of increasingly stable cell chemistries and higher-performance cell
separators, potentially coupled with a modular pack design to prevent propagation.
From a process perspective, continued development in the understanding of the critical
pathways between cell-level failures and vehicle-level effects will become increasingly
crucial, allowing optimal placement and distribution of intervening barriers.
What are the most important safety strategies of l ithium ion batteries to meet the regulatory
requirements and at the same time improve battery pack design to maximize the
functionality, durability and reliability on every cell level?
One of the most important strategies is ensuring the optimization of the balance between
passive and active safety from cell to vehicle level in order to most efficiently provide the
necessary safety coverage whilst minimizing other attribute trade-offs. However, this can
only be achieved with a full understanding of failure propagation pathways.
How car manufacturer can try to implement safe battery management systems for high
vol tage batteries to control temperature, extend lifetime and avoid battery failure?

3. The role of the car manufacturers is to define the interfaces, environment and usage cases
of the battery. If this is done properly the tier 1 supplier is in the optimal condition to express
its expertise and component specific knowledge.
A holistic approach to safety offers the unique opportunity of identifying what is the most
cost effective solution to achieve the highest level of performance while guaranteeing safety.
The foundation of every safety analysis is a deep root cause analysis and a data driven
approach.
What are the advantages of lithium ion batteries concerning safety issues and how do you
estimate the influence of mapping of vehicle-level hazards to high voltage battery behavior?
Whatever the future of transport is some form of energy storage will be necessary. Each
technology: Chemical, electro chemical, capacitive, kinetic comes with a specific set of pros
and cons.
The Li-Ion battery technology has the advantage of being already in a relatively mature state
and with a vast user base in a multitude of consumer products. The aptitude of the OEMs to
cascade vehicle-level requirements to component level requirements will be the key
influence in the development of traction batteries.
Which fundamental procedures do car manufacturers have to implement battery testing?
How do you evaluate the outlook and expectations concerning automotive battery systems
to ensure a safe transport solution for the future?
The use of a well-balanced test program that goes over and above required legislative
testing in order to evaluate vehicle-level battery safety performance is crucial. The test
program needs to be designed to exercise the environmental conditions that the battery is
expected to encounter in-vehicle and to capture vehicle-battery interactions.
Market expectations are that vehicle and therefore battery safety levels will increase over
time. This, coupled with increased penetration of electrically powered vehicles in the market
place, requires ever more stringent safety demands to be placed on automotive battery
systems.

4. High voltage battery safety analysis
from a vehicle-level perspective
John Birch
Functional Safety Technical Specialist
AVL Powertrain UK Ltd
John.Birch@AVL.com
Dario Canevazzi
Battery Systems Component Engineer
Jaguar Land Rover
dcanevaz@jaguarlandrover.com