The car provider will always provide all invoices directly to the employer. They will be addressed to whoever signed the lease or subscription agreement, which is usually a company director.
For any queries in relation to your car invoices, such as requesting a copy or who they get sent to, the employer will need to contact the car provider themselves. The Electric Car Scheme are not able to make these request on behalf of a company- due to customer data protection, car providers will only action these if they are made by someone from your company.
For car providers' contact details, have a look at this article: What are the contact details for the car providers?