Thank you for your question and patience, I’m Tom and I’ll try to help you.
If your husband is abusive then this is a matter to report to the police. They will decide whether or not to charge him.
If charged, they may pursue a conviction. If convicted then you can consider advising the home office of the conviction and they may consider revoking his visa depending on what sentence he receives as a result of the conviction. If they revoked his visa then he would have to leave the UK.
If he received a sentence which does not result in going to prison then he would not be able to apply for ILR for 2 years. If he receives a prison sentence of less than 12 months then he would not be able to apply for ILR for 7 years. If he receives a prison sentence of between 12 months and 4 years then he would not be able to apply for ILR for 15 years.
You can advise the home office in the meantime of the abuse, but it may have a limited effect if the police do not take any action.
Please note that if you wish to return to your home country with your child but without your husband then you will need to apply to court to get a residence/custody order for the child and an order that you be permitted to relocate to another country without your husband. Therefore, I would strongly consider quietly instructing a family solicitor now in secret in order to have someone ready to make the application when you wish.
However, if you wish to prevent your husband from obtaining ILR then your focus is best served by informing the policy and hoping a conviction/sentence occurs thereafter.
My goal is to provide you with a good service. If you feel you have received anything less, please reply back as I am happy to address follow-up issues specifically relating to your question.