Control method and control device of battery system

The embodiment of the invention provides a control method and a control device of a battery system, the battery system comprises N battery branches connected in parallel, N is a positive integer greater than 1, the control method comprises the following steps: determining the number M of closed battery branches in the battery system under the condition that at least one battery branch in the N battery branches is abnormal in communication, m is an integer smaller than or equal to N; and determining the state of charge (SOC) of the battery system according to the number M of the closed battery branches. The control method and the control device provided by the embodiment of the invention are beneficial to improving the performance of the battery system. 本申请实施例提供一种电池系统的控制方法和控制装置，该电池系统包括并联的N个电池支路，N为大于1的正整数，该控制方法包括：在该N个电池支路中的至少一个电池支路的通讯异常的情况下，确定该电池系统中闭合的电池支路的数量M，M为小于或等于N的整数；根据该闭合的电池支路的数量M，确定该电池系统的荷电状态SOC。本申请实施例的控制方法和控制装置，有利于提高电池系统的性能。