Method for preventing circulation of parallel lithium iron phosphate battery pack for station

The invention discloses a method for preventing circulation of a parallel lithium iron phosphate battery pack for a station, which belongs to the field of direct-current power supplies and comprises two groups of lithium iron phosphate batteries, a charging device, a discharging device and a section of direct-current bus. The two groups of batteries share one set of charging device and discharging device, the charging device charges the two groups of batteries through the S1, the D1, the S3 and the D4, and the two groups of batteries are subjected to grid-connected discharging through the discharging device through the S2, the D3, the S4 and the D6. The unidirectional conduction of D1-D4 and the conduction and turn-off of S1-S4 enable the two groups of batteries to operate normally. The measures of mutual independence of loops, one-way flow of energy and parallel capacity expansion of the battery pack are adopted, so that the battery capacity is expanded, energy flow between parallel batteries is avoided, the