Can I put my ex on child support even if we are still living together?

A couple weeks ago my boyfriend beat me up really bad. I didn't call the cops and I regret not doing it. But things are getting worse. We argue everyday n he just makes thing worst. If he ever steps outta line again I will call the cops without any hesitations. I need to leave this house but it's going to take time. I was planning on putting him on child support when I left this house. But now he won't give me any money for diapers or anything. And was wondering if I could put him on it now. I will be out this house in 6 weeks. We have 4 children and were together for 7 years. What should I do or can I do?