Thaum lub caij ntuj no kub qis dhau lawm, lub roj teeb ntawm lub tsheb fais fab yuav tawg lub neej (muaj peev xwm lwj), tsis muaj zog (kev ua haujlwm lwj), yog tias lub sijhawm them nyiaj no tseem yuav ua rau muaj kev phom sij ntawm kev tuag hnyav (lithium nag lossis daus tshwm sim los ntawm kev pheej hmoo ntawm hluav taws xob sab hauv. ntawm thermal runaway).Yog li ntawd, thaum kub qis heev, nws yuav tsum tau cua sov (los yog rwb thaiv tsev).ThePTC coolant rhaub yog tsuas yog siv rau cua sov cov neeg nrog caij compartment, thiab defrosting thiab defogging lub qhov rais, los yog lub hwj chim roj teeb thermal tswj roj teeb preheating.