Olivier Martinez -- Battery Suspect After LAX Melee

Olivier Martinez is the named suspect in a battery investigation after things got out of control at LAX ... TMZ has learned.

We're told Olivier, Halle Berry, 6-year-old Nahla and 1-year-old Maceo arrived at the Tom Bradley International Terminal at 1:45 Sunday afternoon. According to LAX Airport Police, the photogs got too close to the family.

An airport employee was also in the crowd, though it's unclear if he too was trying to snap a pic. Cops say Olivier was holding an empty car seat and allegedly shoved it against the employee, causing him to fall backward.

The employee was treated at the scene and taken to a hospital. We're told he complained of abdominal pain. He's filed a battery report.

We just got video of the incident.