With an increasing number of electric vehicles but relatively insufficient charging facilities, how to utilise and manage the existing charging resource in an efficient and effective way becomes an important challenge to address. In this paper, a charging resource allocation model is proposed to balance the uneven charging demand at different charging stations and minimise the total average waiting time. A queue balancing algorithm is proposed to solve the problem. Case study is conducted on a linear travel corridor. The results show that the proposed approach can balance the charging load among different charging stations and maximise the utilisation of charging resources. Moreover, the proposed model can help reduce the total average waiting time at charging stations.