Key structure and lithium ion battery

The utility model relates to the technical field of key sealing, in particular to a key structure and a lithium ion battery. The utility model discloses a button structure and a lithium ion battery, the button structure comprises a housing, a soft sealing member, a button and a circuit board, the housing is provided with an abdicating hole penetrating through the housing, the circuit board is fixedly arranged on the inner side surface of the housing, the button is arranged on the outer side surface of the circuit board, and the pressing end of the button faces the abdicating hole. The sealing piece covers the outer side face of the circuit board and is located between the inner side face of the shell and the circuit board, the inner side face of the shell is provided with an annular rib, the rib is arranged around the receding hole, and the rib abuts against the outer side face of the sealing piece in a sealed mode. The key structure is good in sealing performance, higher in achievable IP level and more stabl