Broken Ego, Broken Home

I have been married for 7years and blessed with two lovely children.
I have always been the one taking care of the home front because I've a steady job and my husband is into contracts which is seasonal.
I think this is affecting my husband as I suspect he has a complex issue due to the fact that I'm the one paying the bills.
I pay for the house rent,pay for the cost of feeding the family as well as care for the kids.
My husband's inability to perform his manly duties has affected us and he takes it out on me by beating me on a regular basis. I've now turned to his punching bag. He locks me out of our home occasionally and I've to to sleep at the parking lot; forgetting that I've work the next day. I work in a bank, so you all can understand that appearance is key. These days I get to work looking worn out and untidy.
This is just one of the numerous maltreatment which I get from him. With all this I still try to keep my cool in the bid of trying to make my marriage work and give my children a proper up bringing. The one that has broken the camel's back is that he has threatened to take my two kids away from me and asked that we meet in court for divorce as he can no longer live with me.
Please what do I do to prove to this man that all is well if we live in peace and join heads together to live a good life. Please help me find solution to this problem, as I want to make my marriage work. I do not want a broken home on an invaluable grounds.