Should be the battery management system chip, used to monitor the battery voltage, charging current, discharge current, temperature, balance the battery battery, calculate the battery capacity, protect the battery overcharge, overdischarge and so on.
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The main function of the lithium battery protection board is the charge and discharge protection of the controller lithium battery pack. When charging, the voltage difference between individual batteries is less than 9.76mV, so that all individual batteries of the battery pack can be charged equally. Over charge protection, over discharge protection, short circuit protection, over current protection, over temperature protection, and balance protection.
It's not a chip on the battery, it's a plug fuse for short circuit protection.