Are there any lithium battery specification limitation requirements, such as max voltage, width/height/length, etc., that one needs to consider for a wearable device for indoor/outdoor locations?
Battery-powered wearable electronics/devices are covered under the scope of (CSA UL EN) IEC 62368-1,AV/ICT Equipment. If wearable devices are certified to 62368-1, the type of aspects asked about (except design-specific width/height/length of batteries, which are not controlled, except by industry specifications for consumer-grade batteries) are covered under IEC 62368-1’s Annex M, Equipment containing batteries and their protection circuits.Some of the important parameters considered/defined under Annex M include:
• 3.3.17.4 Highest Specified Charging Temperature Highest temperature specified by the manufacturer at a site on each individual cell comprising the battery during charging of a secondary battery. Note1 to entry: It is usually assumed that the end-product manufacturer is responsible to specify the safety-sensitive temperature, voltage or current of the battery, based on the specifications provided by battery supplier.
• 3.3.17.5 Lowest Specified Charging Temperature Lowest temperature specified by the manufacturer at a site on each individual cell comprising the battery during charging of a secondary battery. Note 1 to entry: It is usually assumed that the end-product manufacturer is responsible to specify the safety sensitive temperature, voltage or current of the battery, based on the specifications provided by battery supplier.
• 3.3.17.6 Maximum Specified Charging Current Highest charging current specified by the manufacturer during charging of a secondary battery.
• 3.3.17.7 Maximum Specified Charging Voltage Highest charging voltage specified by the manufacturer during charging of a secondary battery.
However, these parameters are to be specified by the device manufacturer, usually in collaboration with the battery and charger manufacturer and battery specifications.
Note that Annex M will be undergoing considerable refinement in Edition 4 of IEC 62368-1, which will likely be issued in 2Q 2023.
UL Solutions has subject matter experts well versed in IEC 62368-1, including Annex M. Please reach out to us if you would like some assistance - https://62368-ul-solutions.com/contact.html