There's a thread about this already, literally the one made just before yours so, in the future why not read the past day's posts before creating a new thread 'cause most forums including this one really don't like multiple threads on the same topic.
And technically no, it didn't explode, the battery kept itself together as designed thankfully. If it had caught fire for some reason then it would probably have actually exploded - as it is, the gases were trapped inside the battery assembly so it just bloated up bubble-like.