i have Bipolar and I have never been an abusive partner. i also know other bipolars who have not been abusive their partners.
Your partner has bipolar and that makes everything more difficult, but it is not why he is abusing you. He is abusing you because he is abusing you.
You need to draw a line and make some boundaries and requirements for this relationship and expect him to make some major changes and comply with those boundaries and requirements.
If in fact, his bipolar makes it impossible for him to change then he should not be in a relationship. Some people can't work because of BP, some can't be parents because of the BP and some people can't be in intimate relationships because of their BP. It is sad and horrible but in my opinion TRUE. Please keep posting and letting us know how you are doing? 
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I love your faults because they are part of you and I love you. --my BFF
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