Power conversion device and manufacturing method thereof

A power conversion device, comprising:

• a housing enclosing an accommodation cavity, the housing being provided with a filling port and a vent port, wherein the filling port and the vent port are in communication with the accommodation cavity;
• and
• a circuit board disposed in the accommodation cavity, the circuit board having a first surface configured for mounting of electronic components, wherein in a direction perpendicular to the first surface, the first surface faces the filling port and the vent port;
• the filling port is closer to the first surface than the vent port,
• wherein the housing comprises a first housing and a second housing that collectively enclose the accommodation cavity, wherein each of the filling port and the vent port is disposed in the first housing;
• the first housing is an uneven conformal structure, the conformal structure comprises a first region and a second region, wherein the first region is closer to the first surface than the second region;
• the filling port is disposed in the first region;
• and the vent port is disposed in e second region.