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Hello, I made a pot-shaped battery case for a lithium battery heater based on your post. Place the heater close to the bottom of the pot. Use heat-resistant insulation sheets on the floor to prevent heat from escaping. The temperature measurement point is the center inside the box, the center...

I hope this will be of some help to the participants. I implemented it in my little camper and mission accomplished.

The flow of the story so far is completely consistent with my prototype. Four 100A battery packs are placed in an aluminum case and the case is kept warm by an 18W heater and a PID controller.

In my example, four 12.8V100A Lifepo4 batteries are kept warm by an 18W heater. I heated the aluminum case because if I put the heater pads directly on the batteries there is a risk that the temperature would be too high. The result was good...