The ultimate authority on naming media for KODI is the KODI wiki: http://kodi.wiki/view/Video_management#Naming_files. As great as the Wiki is it's always helpful to have some practical examples, not just the naming conventions. Here's how I named a multi-episode file so that it would be correctly scraped in KODI.
I've been using XBMC, now KODI, for a few years now. Over those years I've tried ripping my optical media using a wide variety of programs, exported to many different formats (OGG, AVI, MP4, MKV), and used a few different naming conventions (with underscores, without underscores, appending DVD/Blueray to the name, with(out) date). The different naming conventions really stuck out last night while I was adding more video to our KODI server.