On May 21, 2021, UL official website released the latest proposal content of UL1973 battery standard for stationary, vehicle auxiliary power supply and light rail (LER) applications. The deadline for comments is July 5, 2021. The following is the 35 proposals:

1. Testing of Modules during the short circuit test.

2. Editorial corrections.

3. Addition of an exception to the General Performance Section for the test time for lithium ion cells

or batteries.

4. Revision to Table 12.1, Note (d) for loss of primary control.

5. Addition of an Exception for the Drop Impact Test SOC.

6. Addition of an exception for outdoor use only in the Single Cell Failure Design Tolerance test.

7. Moving all lithium cell requirements into UL 1973.

8. Addition of requirements for repurposing batteries.

9. Clarification of lead acid battery requirements.

10. Addition of Vehicle Auxiliary Power System Requirements.

11. Revisions to the External Fire Test.

12. Addition of cell test method from UL 9540A for information gathering.

13. Clarification for spacings criteria and pollution degree in 7.5.

14. Addition of measurement of cell voltages during overcharge and overdischarge tests.

15. Clarification of the single cell failure design tolerance test.

16. Proposals for flowing electrolyte batteries.

17. Inclusion of mechanically recharged metal air battery requirements.

18. Functional safety updates.

19. Inclusion of EMC testing for electronic safety controls.

20. Clarification of Dielectric Voltage Withstand Test locations on sample.

21. SELV Limits for Canada.

22. Revisions to Section 7.1 to address all non-metallic materials.

23. Smart Grid Applications.

24. Clarifications for Appendix C.

25. Addition of compliance criteria P – Loss of protection controls for Drop Impact Test.

26. Inclusion of sodium ion technology batteries.

27. Expanding the wall fixture test to include other support structures.

28. Evaluation proposal for galvanic corrosion determination.

29. Revision of grounding requirement in 7.6.3.

30. aR Fuse Consideration and Module/component voltage consideration.

31. Addition of criteria for transformers.

32. Overload under discharge.

33. Addition of High Rate Charge Test.

34. Replacement of UL 60950-1 with UL 62368-1.

35. Revision of component standards in Appendix A.

The content of this proposal involves a wider range, mainly to expand the applicability of UL1973. The full content of the proposal can be obtained from the link below.

For more suggestions on the detailed rules, you can contact and feedback to us, and we will give a unified opinion to the STP Battery Standards Committee.

※ Source：

1、UL website

https://www.shopulstandards.com/ProductDetail.aspx?UniqueKey=39034

1、UL1973 CSDS proposal PDF

https://www.mcmtek.com/uploadfiles/2021/05/20210526172006790.pdf