Monitoring and management system and method based on lithium ion super capacitor

Abstract

The invention relates to a monitoring and management system based on a lithium ion super capacitor. The system is composed of a main power circuit, an active balancing unit, a collection unit, and a central control unit. The main power circuit is formed by series connection of a current sensor, a fuse, a super capacitor group, a main positive contactor, a total voltage sensor and a DC / DC bi-directional converter. The active balancing unit connected with the super capacitor group carries out single voltage balancing on the super capacitor group. The collection unit connected with the super capacitor group and the active balancing unit collects single voltage information and temperature information from the super capacitor group and forwards an instruction to the active balancing unit. The central control unit connected with the collection unit, the current sensor, the main positive contactor, the total voltage sensor and the DC / DC bi-directional converter exchanges data and instructions with the collection unit and the DC / DC bi-directional converter, receives data from the current sensor and the total voltage sensor, and controls on or off of the main positive contactor. The system has the following advantages: the control strategy of the super capacitor group is mastered as a whole; and charging and discharging operations of the super capacitor group are controlled based on needs.

Description

technical field [0001] The invention relates to the technical field of rail transit energy recovery, in particular to a monitoring and management system and method based on lithium-ion supercapacitors. Background technique [0002] Lithium-ion supercapacitor, that is, on the basis of traditional double-layer capacitors, is newly manufactured by the process of inserting lithium ions in the negative electrode. It is a special capacitor specially used in energy storage and other fields developed in recent years. A new type of energy storage device between the characteristics of traditional supercapacitors and lithium batteries. Compared with traditional supercapacitors, lithium-ion supercapacitors have higher energy storage density, smaller size, smaller leakage current, and long cycle life. The ultimate life of repeated charging can reach more than 1 million times. Applicable The field is very wide and the practical value is higher. [0003] Since the lithium-ion supercapaci...

AI Technical Summary

Problems solved by technology

[0004] In the prior art, the supercapacitor management system generally only collects the voltage and temperature of the supercapacitor monomer, and uploads it to the charger or bidirectional converter as the basis for supercapacitor group protection, but cannot simultaneously satisfy various necessary protection functions. It is impossible to actively balance the voltage of the supercapacitor monomer, and it is impossible to avoid or prevent the phenomenon of overcharging or overdischarging of the supercapacitor monomer in time, and it is impossible to avoid or prevent the phenomenon of overcurrent charging and discharging of the supercapacitor monomer in time, and the system is safe and reliable. Low, there are potential safety hazards

Images