Lithium Battery Operating temp states max 45° – how that will go in summer when the inside temp of my car will go beyond that?

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The specs operating temp is related to the core temp of the battery/ cell not the ambient temp such as in the car temp.
Secondly Lithium batteries do not vent or gas in any way as they are not liquid and fully sealed cells.
Being Prismatic cell, they are aluminium cased cell within an aluminium battery case so has dual aluminium cooling heat sinks.