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How to understand the highest and lowest specified charging temperature in Annex M.4.2? Can we regard the "charging operation temperature" in the battery specification like 0 -45 degree C as these two temperatures?

The “charging operation temperature” is often used to identify the highest and lower charging temperature for secondary batteries.  When an end product manufacturer this to specify a range beyond to what identified for the component batteries (cells and/or packs) it is very important that they collaborate with the battery supplies to ensure the batteries will perform within the expanded temperature range and the expanded range will not result in overcurrent or overvoltage conditions that will result in failures in constructions that may result in risk of fire, explosion and/or leakage of materials.  End product manufactures should continue their practice of working with their battery suppliers to make sure the batteries are tested at the component level for the needs of the end product. 


In IEC 62368-1:2018, IEC 62133-2, Secondary cells and batteries containing alkaline or other non-acid electrolytes – Safety requirements for portable sealed secondary cells, and for batteries made from them, for use in portable applications – Part 2 Lithium systems, similar to IEC 62133:2012, Annex A provides more detailed explanations of the effects of overvoltages along with temperatures and charging current. It explains that charging voltage and charging current need to be adjusted based on the temperature ranges. If the reader has not had an opportunity to review this Standard, it is recommended they do so.  

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