Conditions and procedures of Japan research

Reminder of Japan research in phase2 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). Thermal propagation test draft Institutes A B Sample X ← Initiation method Nail Number 1 2 Institute A Institute B Confirm reproducibility Confirm repeatability

Reminder of Japan research in phase2 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. 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 :

Conditions of Japan research Procedures of Japan research Outline Conditions of Japan research Procedures of Japan research Note Tests at site B have already been conducted. Pictures in this material were taken in the test.

Conditions Condition Reason Nail Material Alloy tool steel Steel Current condition (Phase1 Part1) Nail Material Alloy tool steel Steel Same as current condition. Diameter 3mm More than 3mm Within current condition. Angle 60° 20 - 60° Speed 0.1mm/sec 0.1 - 10mm/sec Insertion depth ½ of cell height - Because of test equipment spec Temperature Depends on test place 25±2°C Institute B doesn’t have air conditioner in test booth. Position of target cell See page 6 Surrounded by other cells. Thermal propagation is likely to happen. Insertion point of cell See page 7 To surely cause internal short circuit. Voltage detection points See page 8 To detect thermal runaway of trigger cell and surrounding cells. Thermocouple points See page 9 ↑ Pressure point See page 10

Conditions Position of target cell: This cell is surrounded by other cells. Thermal propagation is likely to happen. Module2 8 7 6 5 Cell 1 4 5 8 9 12 Module1 2 3 4 2 3 6 7 10 11 Target cell （Cell5 in Module2）

（About 5.5mm from center of vent ） Conditions Insertion point of cell There are 4 electrodes inside cell. To surely cause internal short circuit, we select this point. Nail Module2 Cell 1 About 5.5mm 4 5 8 9 12 About 5.5mm A A 2 ３ ６ ７ 10 11 Insert point （About 5.5mm from center of vent ） Electrode Section A-A

Conditions Voltage detection points To detect thermal runaway of target cell and surrounding cells. Module2 8 7 6 5 Cell 1 4 5 8 9 12 Target cell （Cell5 in Module2） Module1 2 3 4 2 3 6 7 10 11 Measurement Point Remark V1 Voltage of module 1 V3 Voltage of module 3 V4 Voltage of module 4 V5 Voltage of module 5 V6 Voltage of module 6 V7 Voltage of module 7 V8 Voltage of module 8 Measurement Point Remark V2 1-3 Voltage of cell 1-3 inside module2 V2 4 Voltage of cell 4 inside module2 V2 5 Voltage of cell 5 inside module2 V2 6-7 Voltage of cell 6-7 inside module2 V2 8 Voltage of cell 8 inside module2 V2 9-12 Voltage of cell 9-12 inside module2

Conditions Thermocouple points To detect thermal runaway of target cell and surrounding cells. Module2 T2 4 8 7 6 5 Cell 1 T2 5 T8 T7 T6 T5 4 5 8 9 12 T2 8 Target cell （Cell5 in Module2） Module1 2 3 4 T1 T3 T4 2 3 6 7 10 11 T2 6 Measurement Point Remark T1 Temp of module 1 T3 Temp of module 3 T4 Temp of module 4 T5 Temp of module 5 T6 Temp of module 6 T7 Temp of module 7 T8 Temp of module 8 Measurement Point Remark T2 4 Temp of cell 4 inside module2 T2 5 Temp of cell 5 inside module2 T2 6 Temp of cell 6 inside module2 T2 8 Temp of cell 8 inside module2

Conditions Pressure sensor point As shown below. Pressure sensor

Procedures REESS preparation Test preparation No Procedure 1 Remove REESS from vehicle. 2 Remove upper case from REESS. 3 Remove plastic cover for insulation from REESS. 4 Make a hole in upper case (See Page 13) and plastic cover to pass nail. 5 Set thermocouples and voltage detection lines to REESS. 6 Set pressure sensor to upper case. 7 Set plastic cover to REESS. 8 Set upper case to REESS. 9 Charge REESS and adjust SOC. Test preparation No Procedure 1 Set a nail test equipment in the test booth without nail. 2 Set REESS to the nail test equipment. 3 Adjust position of REESS and nail to pass it through the hole. 4 Set nail to the nail test equipment.

Procedures Test No Remark 1 Start measurement temperature, voltage and pressure. 2 Start to move nail until 1/2 of cell height. → Internal short circuit / Thermal runaway 3 Observation 4 Stop measurement. 5 Wait until thermal event settles. 6 Remove upper case and plastic cover. 7 Observe REESS after test. 8 Discharge or deactivate REESS. 9 Waste REESS.

Procedures Hole in upper case As shown below. Hole for nail Φ5mm