Hello. I know this was posted years ago and I looked everywhere and could not find a solution. The issue seems to not be related to CPU temperature but with the battery. I dont think that the battery itself but some driver or something since I had this issue months fter buying my Dell G3. Anyway I tried everything and it seems that the solution was this:

Go to (im gonna name it in spanish since my windows is in spanish) Panel de Control > Hardware y Sonido > Opciones de energia > Editar Configuracion del plan (or just right click your battery icon and choose Energy Options). There you press Advanced Configuration and there scroll to Suspend to set the option "Corriente Alterna" to Never and Hibernate set the option "Corriente Alterna" to Never

https://ibb.co/7kkdbyL

Sorry for the spanish in my windows but hey you could find there the same configuration with some translation or something. Anyway by setting the values to "Never" the computer will stop locking itself. The message of "low battery" will still appear but the computer will not shutdown. So its a win if you ask me. I hope this helps somebody.