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1 Progress Report on TF5 test items. 2 1.Status update on TF5 2.Summary 3. Next step activity Content.

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Presentation on theme: "1 Progress Report on TF5 test items. 2 1.Status update on TF5 2.Summary 3. Next step activity Content."— Presentation transcript:

1 1 Progress Report on TF5 test items

2 2 1.Status update on TF5 2.Summary 3. Next step activity Content

3 3 Cell/module level test procedure proposals and requirements sent for reviewing on Feb. 15 th, 2014; Feedback from Korea on Feb. 27 th, 2014; Comments from SK, Continental on Dec. 16 th, 2013; Feedback of OICA on 20 th Mar., 2014; Teleconference held on April 9 th. Status update on TF5

4 4 1.Some participants expressed that the whole vehicle and system design could guarantee the EV safety 2.TF5 have been carrying on lots of discussion about the needs of tests from the cell/module level 3.The definition of module was proposed, which is A group of cells connected together either in a series and/or parallel configuration with or without protective devices (e.g. fuse or PTC) and monitoring circuitry, which is able to be transported and replaced. 4.Cell/module level test items were added on the 4th Bei Jing meeting Status update on TF5

5 5 1.cell/module are the most important components in the EV power system, some safety risks caused from the characteristics of cell/module itself, especially when a short circuit happens in a module, it may cause the cell venting, burning, or even explosion and lead to propagation. 2.The phenomena of internal short circuit couldn’t be monitored and controlled by BMS, would cause serious safety consequences once it happens. China proposes test items to simulate for internal short circuit and thermal propagation. Summary

6 6 1.About the cell/module level tests, it is not necessary to repeat all the existing system level tests, but to identify the specific test items such as: internal short circuit, thermal propagations 2.Further discussion and research will be carried on about the test items and test procedures. Next Step Activities

7 7 Thanks!

8 8 Back-ups

9 9 Nail penetration test Internal short circuit test

10 10 Meltdown Temperature of separator is the key factor for Thermal Runaway T lower than 493K, the internal short circuit is the major cause for the thermal runaway T higher than 493K, decomposition of anode and cathode materials are the major cause for thermal runaway Internal short circuit leads to thermal runaway Adiabatic Simulation

11 11 The current Internal short circuit test method is recommended, such as JIS 8714 of Japan. Nail penetration test

12 12 The state of the membrane after nail penetration test: the perforation membrane become thin and transparent, and some membrane melt at the edges of contact with the needle. A small amount of active powder fell off the plate and stuck to the membrane. Internal short circuit can be simulated excellently by nail penetration test. Nail penetration test

13 13 before test after test valve open Test begin Temp. reach100 ℃ Temp. reach 200 ℃ before test Nail penetration test

14 14 t=6st=7st=8st=10st=12st=20s Nail penetration test is the more effective alternative test method for the Internal short circuit phenomena. Nail penetration test

15 15 Oven test is not the normal reliability test item, but the safety abuse test item for thermal stability. Except that considering the application environment temperature, more attention should be paid to the key factors for cell thermal stability itself. And oven test can be used for the simulation of thermal propagation ( for example, if the temp. of one cell increases rapidly at the condition of internal short circuit, this phenomena inserts serious affect on the surrounding cells, thermal propagation will happen). (UL1642 Environmental Test - Heating Test 、 IEC62660 Reliability and abuse tests - High temperature endurance 、 SAE J2464 Thermal Abuse Test – Thermal Stability Test) Oven ℃

16 16 At 130 ℃, SEI starts to decompose and exothermic reaction begins, thermal runaway will probably happen with the heat accumulation. And the membrane starts to melt at about 130 ℃, which leads to higher short circuit risks. Oven ℃


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