Liquid medicine injection device

A liquid medicine injection apparatus comprising:

• a housing provided such that an interior is at least partially opened at a first time point and the interior is sealed at a second time point that is later than the first time point;
• a needle assembly located in the housing and provided to be at least partially discharged out of the housing according to a manipulation of a user at a third time point that is later than the second time point;
• a reservoir sealed in the housing after the second time point, accommodates a liquid medicine, and fluidly connected to the needle assembly;
• a driving module sealed in the housing after the second time point and generating a driving force for discharging the liquid medicine after the third time point;
• a transmission module configured to receive the driving force from the driving module and transmit the driving force to a plunger disposed in the reservoir;
• a battery module sealed in the housing after the second time point;
• a control module sealed in the housing after the second time point, and electrically connected to the battery module after the third time point so as to control the driving module;
• and
• at least one electronic module accommodated in the housing and electrically connected to the control module,
• wherein the housing includes an entrance hole that is opened at the first time point and sealed at the second time point,
• the electronic module is configured to be electrically connected to an outer electronic apparatus via the entrance hole at the first time point and electrically disconnected from the outer electronic apparatus at the second time point, and
• the battery module is configured not to be used at the first time point and the second time point.