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

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 6469-1 amendment But timing may vary

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)

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and data Laser JP to provide study results Mild steel nail penetration DE test description External short of module Withdrawn by KR Electric heater JP to provide test results Electric heater (cell replacement) CN to provide test description and data TRIM & “Shock Heater” FR to request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

Annex.A: WG3 Activity – Trigger Method Evaluation