Here is something that I can recommend to you for now given these requirements:
MP2793 | 4-Cell to 16-Cell, High-Accuracy Battery Monitor and Protector with Coulomb Counting | MPS
Please look through the datasheet to see if this works for you. On paper, the voltage works to a max of 86V, it can handle 14 series cells, is capable of passive cell balancing, and has over current/temp protections.