Hi,
Your husband gets 24 points for language proficiency (as the principal applicant). As an accompanying spouse, you also need to take the IELTS if you would like to contribute 5 more points under adaptability. However, you will only need to be at CLB 4, which should be easier as it corresponds to IELTS 4.5/3.5/4/4 for Listening/Reading/Writing/Speaking. Good luck!
Regards