1. TC22 SC37 WG3 Liaison Report for EVS-GTR Thermal Propagation Work Item
Dr. Annika Ahlberg Tidblad (SE)
Brian J. Lawrence (UK)
Mar-2018

2. Introduction
AAT & BJL participated in two TC22 SC37 WG3 meetings on Thermal Propagation since EVS 14th session:
10-11 Jan-2018, Stockholm, Sweden
19-20 Mar-2018, Ningde, China
7 national standards organisations represented:
China (CN), France (FR), Germany (DE), Japan (JP), South Korea (KR), Sweden (SE) and UK
National organisation focus
Test method development
Cell-level initiation DE, JP, CN
Module-level initiation KR
Standardised methodology for “Documented Approach”
SE, UK, FR
Note: Not mutually exclusive
Expectation that both concepts to be included in ISO amendment
But timing may vary

3. WG3 Activity – Stockholm & Ningde Meetings
Agreement on evaluation scheme for (cell-level) trigger methods
See Annex.A: WG3 Activity – Trigger Method Evaluation (Slide 4)
National organisation feedback discussed at Ningde meeting, 19 & 20-Mar-2018
Identification of preferred candidate methods for further investigation
Elimination of non-preferred candidates
Draft standard/guideline with content for “documented approach”
Significant work presented by SE (AAT)
National organisation feedback discussed at Ningde meeting
Summary & Conclusions
Fundamental question of forced Thermal Runaway remains open
Wide range of candidate methods still under investigation
Next steps
WD1 by end 2018 (test and documented methodologies)
See also slide 4.
Next meetings:
22 & 23-Oct-2018, France
21 to 23-Jan-2019, S. Korea (provisional)

4. WG3 Next Steps (cont.) Inserted seed method Electric heater
SE to obtain NREL/NASA data
Inserted micro heater
FR to provide data
New “Precise controlled ISC”
CN to provide test description and data
Laser
JP to provide study results
Mild steel nail penetration
DE test description
External short of module
Withdrawn by KR
Electric heater
JP to provide test results
Electric heater (cell replacement)
CN to provide test description and data
TRIM & “Shock Heater”
FR to request data from Canada
Chemical heater (cell replacement)
DE test description and data
Definitions needed:
Internal failure
Internal short circuit
“Worst case” ISC (time/energy release)
Thermal event
Thermal Runaway

5. Annex.A: WG3 Activity – Trigger Method Evaluation