Committee of experts on the transport of dangerous goods and on the globally harmonized system of classification
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Proposal13. COSTHA recommends industry continue to study the conditions of the T4 test, and the creation of an Ad Hoc committee including members of the UN Working Group as well as industry standard organizations such as the Society of Automotive Engineers (SAE). While SAE is in the initial stages of reviewing the standards applicable to lithium battery transport, such an organization can provide detailed and data driven analysis to the problem. Findings or recommendations can be provided to the Working Group either at the next meeting (if needed), or through email correspondence. 14. To support the effort, COSTHA recommends both vibration and shock data be supplied to the Ad Hoc committee to provide an appropriate approach to the development of the test requirement. Consensus by the Un Working Group on this point may facilitate submission of data that may not otherwise be made available. Data most applicable to this effort would be vibration and shock testing of batteries 12 kg and larger (although data for batteries as small as 4 kg could be reviewed). 15. Although COSTHA is not formally proposing a modification to the T4 at this time, an example of what could be proposed is included below for discussion only. 16. [COSTHA recommends revising the conditions of the T4 test to address the significant amplification of force in testing large format batteries. Instead of setting the acceleration (gn) as a constant (150 gn for <12 kg batteries and 50 gn for <12 kg batteries), we recommend the required force be set as the constant based on 12kg at 50 gn, to a maximum acceleration of 150 gn (use the maximum force expected during normal conditions of transport) and determine the required acceleration based on the consideration and equations: For the mass domain X<6200Wh (approximately 120 to 150kg), let the force be constant: Constant Force = 50 gn *12kg (The force resulting from the acceleration applied to the smallest “Large Battery” under the current UN38.3 T4 test) For the mass domain 0 Then 50 gn *12kg=150 gn * X, therefore X=4kg. And the resulting Acceleration vs Mass for UN 38.3 T4 given by Figure 2: 
17. For the purposes of the test, the pulse duration shall be the amount of time necessary to impart an acceleration on the test mass given the required input force. When a mass is subjected to an impact, there are deformations in the system that increase the impulse time for objects of larger mass. 18. The Working Group is invited to recommend a proposed force for inclusion in each equation. The tables can then be adjusted for determination of appropriate acceleration requirements.] Supporting Data 19. COSTHA has included below tables and figures identifying both the current calculations (Table 1, Figure 1), and the proposed calculations (Table 2). 20. Table 1 details the current calculation where acceleration is a constant, mass is the independent variable and force is the responding variable. 21. Table 2 details the proposed equations and resulting acceleration values where the acceleration is constant at 150 gn from 0 to 4kg, and the force exerted is constant at 12kg*50 gn from 4kg to 6200Wh. Mass is the independent variable, and the acceleration becomes the responding variable. Figure 2 details the results graphically. 22. Table 3 compares the forces between the current UN38.3 T4 test for a 100kg battery vs the force exerted on a 1600kg automobile during a 30mph front offset collision. 
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