Backup power supply system for rail transit

Abstract

The invention discloses a backup power supply system for rail transit. The backup power supply system comprises a lithium battery pack, a battery management system (BMS), a limit protection relay and a vehicle-mounted charger, wherein the BMS and the limit protection relay are respectively connected with the lithium battery pack; the vehicle-mounted charger is connected with the BMS and the limit protection relay; the BMS is also connected with the limit protection relay and is used for performing unified management and maintenance on the lithium battery pack; the vehicle-mounted charger is used for charging the lithium battery pack by the limit protection relay; the limit protection relay is used for protecting the lithium battery pack under the limit condition, wherein the limit condition is that the lithium battery pack is positioned in an overcharging or over-discharging state. According to the backup power supply system disclosed by the invention, the lithium battery pack is used to replace the original nickel-cadmium storage battery, so light weight and no pollution of the storage battery are realized; besides, due to adoption of the BMS with a specified structure, the reliability and the safety of the power supply system are improved.

Description

technical field [0001] The invention relates to the field of rail transit, in particular to a rail transit backup power supply system. Background technique [0002] The backup power supply of the existing EMU adopts nickel-cadmium battery pack, which is used as the emergency backup power supply of the train, which has high requirements on the reliability of the battery system, and the backup power supply affects the normal operation and safety of the train. [0003] However, the nickel-cadmium storage battery system currently used has no self-test and protection functions, blind charging and blind discharging are implemented, and the weight is heavy under the same capacity, the capacity decays quickly, and the pollution is large after the battery is scrapped. Contents of the invention [0004] The technical problem to be solved by the present invention is to provide a set of lithium-ion battery system to provide backup power for rail transit, replace the original nickel-ca...

AI Technical Summary

Problems solved by technology

[0002] The backup power supply of the existing EMU adopts nickel-cadmium battery pack, which is used as the emergency backup power supply of the train, which has high requirements on the reliability of the battery system, and the backup power supply affects the normal operation and safety of the train

[0003] However, the nickel-cadmium storage battery system currently used has no self-test and protection functions, blind charging and blind discharging are implemented, and the weight is heavy under the same capacity, the capacity decays quickly, and the pollution is large after the battery is scrapped.

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