Item 4: Electrified Vehicle Battery Performance & Durability Presented by: USA, Canada EVE-13 meeting January 12, 2015 1.

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Presentation transcript:

Item 4: Electrified Vehicle Battery Performance & Durability Presented by: USA, Canada EVE-13 meeting January 12,

Outline 1.Review, EVE-12 meeting discussion on Battery durability 2.Continued discussion: a)Battery durability definition b)Factors affecting battery durability c)Battery degradation mechanisms 3.Proposal for work: a)Motivation, Deliverables b)Research method, Timeline 4.Next steps 2

Review: EVE-12 meeting discussion on Battery durability EVE should continue the investigation of xEV battery durability as a vehicle-level issue EVE should consider this topic under Part A and B of the new mandate Potential issues to be addressed under Part A: Establish a definition of battery durability What criteria should be established for full useful life requirements? Identify all factors that effect battery durability Work to support the design of an appropriate test program or methodology for evaluating battery durability Where test cycles and procedures are considered, the WLTP will be the basis 3

Battery Durability Definition Adopt an existing definition Contracting parties Stakeholder specific definitions International standards Create a new definition for electrified vehicle durability Adapt existing durability concepts currently being used in regulations Based on the discussions to-date, the definition of battery durability and/or a potential methodology for determining durability could have a significant influence on battery design. 4

Continued discussion: Factors affecting battery durability 5

Continued discussion: Battery degradation mechanisms Table 1: Lithium-ion anode aging- causes, effects, influences Vetter, J. et al. Aging mechanisms in lithium-ion batteries, Journal of Power Sources 147 (2005)

Continued discussion: Battery degradation mechanisms Potential means of assessing battery durability is to examine the two degradation effects (capacity fade and power fade) and rank the conditions which contribute to the degradation effects However, battery chemistry, battery management system, and thermal management systems have highly significant impacts on the condition ranking. 7 EffectsConditions or factors, i.e. High SOC Capacity FadeC1C1 C2C2 C3C3 C4+C4+ Power FadeP1P1 P2P2 P3P3 P4+P4+

Proposal for work Motivation There is limited knowledge of xEV battery durability, which presents a risk to Regulators and manufacturers HEVs that are currently credited by regulations for low emissions for their whole lifetime could contribute to vehicle emissions more as the battery ages Deliverables: 1.To highlight the importance of xEV battery durability 2.To outline the factors affecting durability 3.To inform the decision of GTR development in Part B of the EVE mandate: a standardized way of evaluating durability At this time it is unclear what a GTR would contain 8

Proposal for work Research method: Literature review: Definition of xEV battery durability, factors affecting xEV battery durability Existing test programs or methodology for evaluating battery durability Timeline: January – June 2016: Complete work on Part A Jan – December 2015: Literature review Jan – March 2016: Analysis of the review, draft Part B proposal June 2016: Present informal documents on status of Part A and proposed GTR development requests (Part B) to GRPE, AC.3 November 2016: AC.3 decision to authorize GTR development (Part B) 9

Next steps Request for participation in the literature review Develop a detailed proposal for the literature review and acquire funding Develop a detailed roadmap for the next EVE meeting 10

Additional slides 11

Proposal for work Potential challenges Time constraints: Simulating aging of a battery to test durability may be difficult given the 1 year time frame Complexity of battery management systems Requirement for companies to release proprietary information about their BMS and thermal management systems to run battery tests; need manufacturers on board with research Variety of battery chemistries (i.e. all batteries are not the same and chemistries may impact durability) Bench aging techniques of batteries are still in the early stages of development 12

Proposal for work Potential sources of information Battery test procedure manuals published by US Advanced Battery Consortium and US Department of Energy EVE Reference Guide from first EVE mandate Data reported by private citizens Idaho National Laboratory testing reports ANSI report, SAE J1798 and ISO : 13