You can get this addition of £156.45 per month if you are caring for a severely disabled person for at least 35 hours a week. You do not have to claim Carer's Allowance to get this element.
Unlike Carers Allowance where you are prevented from claiming if you are earning above a certain level (£120pw for 2018/19), for the Carers Element your level of earnings does not prevent you from claiming. However, as the Carers Element is a part of Universal Credit,which is means-tested, your earnings and other income will affect whether you can get this and how much universal credit you are entitled to.
If you are making a joint claim you can get a carer element each if you both qualify for it, but you cannot be caring for the same severely disabled person.
Took this off the UC turn to us guide. I would expect that your partner would be eligible, though the amount he earns would affect the entitlement. Because he works he should have whats called an underlying entitlement to Carers Allowance anyway (but earnings stop him from doing so) You need to either ring or make an appointment with the UC and they will tell you if he can qualify. Hope that helps x
There will be no underlying entitlement to carers allowance unless the income from the partner is low.