Battery management system

Abstract

A battery management system, comprising: a plurality of battery connection modules, wherein each battery connection module has a positive input end and a negative input end; two adjacent battery connection modules are connected by means of positive input ends and negative input ends, such that the plurality of battery connection modules are connected to form at least part of a charging / discharging series circuit; and each battery connection module comprises a short-circuit unit, a battery connection unit for connecting batteries, and a connection / disconnection switching unit, the short-circuit unit being connected to the battery connection unit in parallel, and both the short-circuit unit and the battery connection unit being electrically connected to the positive input end and the negative input end by means of the connection / disconnection switching unit. A charging / discharging module is electrically connected to the charging / discharging series circuit, a battery monitoring module is connected to the battery connection unit, and a main control module is respectively connected to the battery monitoring module and the connection / disconnection switching unit to control the operation of the connection / disconnection switching unit according to a battery monitoring situation, such that the input and output of a battery are separately controlled, thereby ensuring a sufficient surplus of the capacity of the battery, and improving the power supply stability of the battery during cascade utilization.