Capacity evaluation method, device and equipment for battery pack

The invention provides a capacity evaluation method, device and equipment for a battery pack, and relates to the technical field of batteries, and the capacity evaluation method comprises the steps: obtaining the detection data of the charging and/or discharging of each battery string in a to-be-evaluated battery pack; according to the detection data, determining a first battery string which affects the charging capacity performance of the to-be-evaluated battery pack and a second battery string which affects the discharging capacity performance of the to-be-evaluated battery pack; in the detection data, acquiring voltage data influencing the capacity performance of the battery pack to be evaluated; respectively calculating the capacity of a first battery string and the capacity of a second battery string according to a fitting model of a relationship between a state of charge (SOC) and an open circuit voltage (OCV) corresponding to the to-be-evaluated battery pack and the voltage data; and calculating the ca