OICA Position on Venting Requirements in EVs

1. Japan Presentation
EVS-GTR Phase2
Thermal propagation

2. Outline
Background
Challenges of stipulating thermal
propagation test
Japan research in phase2
Future plan

3. Back ground
 Since there are a lot of challenges to stipulate thermal
propagation test, we decided
1. To require the manufacturer to submit documentation
in phase 1.
2. To keep discussion about them in phase2.
→We would like to discuss again.
200. Given the limitations surrounding
development of a specific test to evaluate
single cell thermal runaway, it was decided to
require the manufacturer to submit
engineering documentation to demonstrate
the vehicle's ability to minimize the risk
associated with single cell thermal runaway.
GRSP 61-07

4. Challenges
 Challenges of thermal propagation discussed in Phase1 are
shown below.
 To stipulate this as regulation test, we need to solve these
challenges.
(a) Further investigation of previously considered initiation
methods to evaluate proposed initiation methods and
their feasibility, repeatability and reproducibility;
(b) Investigate potential new methods for initiation including
methods which minimize manipulation of the Tested-
Device;
(c) Evaluate appropriateness of pass/fail criteria, e.g. how to
differentiate smoke/fire emanating out of the initiation
cell from smoke/fire occurring due to propagation;
(d) Investigate if there is any impact on the test outcome
arising from the manipulation of the Tested-Device.
GRSP 61-07
3. Thermal propagation21

5. Challenges (Details)
Challenges
How to solve
Contents Details
1 Precondition
What is trigger of thermal runaway
of this test? Internal short circuit? or
unpredicted abuse condition?
Discussion in IWG
2
Repeatability
and
reproducibility
Are the results same whenever and
wherever this test is conducted?
And whoever conducts?
Confirmation test
=>This year
3 Feasibility
Is it possible to conduct this test for
any kind of packs?
Discussion about various
type of batteries
4
Judgement of
thermal
runaway
• dT/dt: 1°C/s?
• “dT/dt and voltage drop” or “dT/dt
and max temperature”?
Discussion based on
various test data
5
Selection of
target cell
Which cell should be selected as
target cell?
Discussion about various
type of batteries in
conjunction with feasibility
 In terms of some challenges, confirmation tests are necessary to
solve. We are planning to conduct test.

6. Challenges
How to solve
Contents Details
6
Efficiency of
manipulation
Are the results same with or
without manipulation?
Confirmation test
=>Next year
7 Trigger methods Is overcharge a candidate?
Discussion in conjunction
with precondition
8
Equivalency of
trigger methods
Same result by whichever
methods?
Confirmation test
=> Next year
9
Detail conditions
of each trigger
Nail
• Material
• Shape (Diameter,
Angle)
:
Discussion based on
precondition, justification
and test data
Heater
• Heat speed
• Max temperature
:
10
Environmental
condition
Is temperature “ambient
temperature” or “more than
0 °C” ?
Discussion based on
climate data of various test
place
: : : :
Challenges (Details)

7.  To consider conditions of world round robin test, Japan will conduct
repeatability and reproducibility confirmation test in advance.
 Different organizations inside Japan will conduct thermal
propagation test according to current draft, using same sample and
same initiation method (Nail).
Japan research in phase2
Institutes A*1 B*1
Sample X ←
Initiation method Nail ←
Number 1 2
Confirm
repeatability
Confirm
reproducibility
Thermal
propagati
on test
draft
Institute A Institute B
*1:Not decided yet

8. Japan research in phase2
Sample 1 2 3
Institute A B
Thermal runaway of initiation
cell occurs/ not occurs
Voltage drop of initiation cell
Temperature of pack
Pressure of pack
Thermal propagation occurs/
not occurs
Thermal propagation velocity
:
 It is possible to confirm which parameter have repeatability and
reproducibility.
 Based on these results, we would like to discuss conditions and
criteria of world round robin test.

9. 2017 2018 2019 2020
IWG
Japan
Research
Round
robin test
Discussion
Round robin test
Report Report
#1
Decision method,
condition and criteria
of the round robin test
#2 #4
Equivalency of
trigger methods
Efficiency of manipulation (Nail)
Repeatability and
reproducibility (Nail)
Repeatability and
reproducibility (Heater)
Future plan
Today

10. Thank you for your
kind attention!