Soft package lithium iron phosphate battery with overcharge protection function and battery pack

The invention relates to a soft package lithium iron phosphate battery and a battery pack, the soft package lithium iron phosphate battery comprises a positive electrode material, the positive electrode material comprises lithium iron phosphate and modified lithium carbonate, the total content of lithium carbonate in the modified lithium carbonate is 0.3-0.8 wt% of the lithium iron phosphate, and the modified lithium carbonate comprises lithium carbonate powder and a conductive material coating the surface of the lithium carbonate powder. The modified lithium carbonate is introduced into the positive electrode material, and when the soft-package lithium iron phosphate battery is overcharged, the battery is actively induced to quickly generate gas in a high-voltage interval after overcharging, so that a large amount of gas is filled between pole pieces after the battery is overcharged, the fluidity of lithium ions in the battery is severely blocked, and the battery is in a high-resistance state. Under the cond