CN111572567A - Non-net self-walking storage battery and direct-current bus bidirectional converter system for rail transit - Google Patents
Non-net self-walking storage battery and direct-current bus bidirectional converter system for rail transit Download PDFInfo
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- CN111572567A CN111572567A CN202010330145.3A CN202010330145A CN111572567A CN 111572567 A CN111572567 A CN 111572567A CN 202010330145 A CN202010330145 A CN 202010330145A CN 111572567 A CN111572567 A CN 111572567A
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- lithium titanate
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- 230000002457 bidirectional effect Effects 0.000 title claims abstract description 71
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims abstract description 67
- 229910052744 lithium Inorganic materials 0.000 claims abstract description 67
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims abstract description 66
- 238000012544 monitoring process Methods 0.000 claims abstract description 52
- 238000004891 communication Methods 0.000 claims description 6
- 238000005070 sampling Methods 0.000 claims description 6
- 230000005540 biological transmission Effects 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 230000003446 memory effect Effects 0.000 claims description 4
- 230000003993 interaction Effects 0.000 claims description 3
- 230000002452 interceptive effect Effects 0.000 claims description 3
- 238000004146 energy storage Methods 0.000 abstract description 3
- 238000007599 discharging Methods 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- OJIJEKBXJYRIBZ-UHFFFAOYSA-N cadmium nickel Chemical compound [Ni].[Cd] OJIJEKBXJYRIBZ-UHFFFAOYSA-N 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61C—LOCOMOTIVES; MOTOR RAILCARS
- B61C3/00—Electric locomotives or railcars
- B61C3/02—Electric locomotives or railcars with electric accumulators
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L50/00—Electric propulsion with power supplied within the vehicle
- B60L50/50—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells
- B60L50/60—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells using power supplied by batteries
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/062—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for AC powered loads
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T30/00—Transportation of goods or passengers via railways, e.g. energy recovery or reducing air resistance
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The invention belongs to the technical field of rail transit power supply and energy storage, and relates to a netless self-walking storage battery and direct-current bus bidirectional converter system for rail transit, which comprises a lithium titanate battery pack, a current and voltage acquisition monitoring module, a BMS battery management system and a bidirectional DC/DC converter; the lithium titanate battery pack stores electric energy, the electric energy is controlled through the contactor, and charging and discharging are carried out through the positive electrode contactor and the negative electrode contactor. The lithium titanate battery pack provides power for the high-voltage direct-current bus through the bidirectional DC/DC converter. The vehicle does not have the net and walks by itself under the condition that the vehicle does not have the net and the direct current bus is electrified. The current and voltage acquisition monitoring module samples current and voltage and transmits data to the BMS battery management system. The BMS battery management system monitors the state of the lithium titanate battery pack to enable the lithium titanate battery pack to be in a healthy working state, communicates with the bidirectional DC/DC converter, and diagnoses and debugs the netless self-walking storage battery and the direct-current bus bidirectional converter system for rail transit.
Description
Technical Field
The invention belongs to the crossing field of a rail transit power supply technology and an energy storage technology, and particularly relates to a netless self-walking storage battery and direct-current bus bidirectional converter system for rail transit.
Background
The netless self-walking storage battery and direct-current bus bidirectional converter system for rail transit combines a rail transit power supply technology and a lithium titanate battery energy storage technology to form an independent system which is installed at the bottom of a subway or a motor train unit vehicle in a vehicle bottom hoisting mode. The rail transit such as subway, motor car is regarded as the most green traffic mode with characteristics such as the freight volume is big, fast, safety, environmental protection and energy saving. Due to the large volume of traffic, the power supply system of the vehicle is of particular importance. The train walking mode of the netless self-walking can provide a new power supply mode for the train, and the possibility of self-walking of the train in multiple power supply modes is provided later. In addition, when the vehicle is failed in power receiving, the process of waiting for rescue, if the lithium titanate battery pack can be used as a power supply for the vehicle to walk by itself, the vehicle does not need to be pulled to a station by simply relying on rescue after the normal power supply of the vehicle fails, and then passengers are evacuated. The emergency traction and auxiliary storage batteries for rail transit vehicles are generally lead-acid batteries and cadmium-nickel batteries, and the batteries have the characteristics of short service life, memory effect and the like. Therefore, the invention is a safe, reliable and environment-friendly netless self-walking storage battery and direct-current bus bidirectional converter system for rail transit.
The invention is proved by national standard tests that explosion and fire can not occur under various conditions, and the invention is absolutely safe and reliable.
The invention can realize the net-free self-walking of the train and has the service life of more than 10000 times.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a netless self-walking storage battery and direct-current bus bidirectional converter system for rail transit.
In order to achieve the above purposes, the technical scheme adopted by the invention is as follows:
a netless self-walking storage battery and direct-current bus bidirectional converter system for rail transit comprises: the system comprises a lithium titanate battery pack 1, an isolating switch 2, a voltage acquisition monitoring module 3, a positive fuse 4, a negative fuse 5, a current acquisition monitoring module 6, a positive contactor 7, a negative contactor 8, a bidirectional DC/DC converter 9, a train high-voltage direct current bus 10, a ground wire 11, a train network module 12 and a BMS battery management system 13;
the positive pole of the lithium titanate battery pack 1 is connected with one end of one pole of the isolating switch 2, the other end of the one pole of the isolating switch 2 is respectively connected with the positive pole of the voltage acquisition monitoring module 3 and one end of the negative fuse 4, the other end of the negative fuse 4 is connected with one end of the current acquisition monitoring module 6, the other end of the current acquisition monitoring module 6 is connected with one end of a positive pole contactor 7, the other end of the positive pole contactor 7 is connected with one end of the positive pole of a bidirectional DC/DC converter 9, and the other end of the positive pole of the bidirectional DC/DC converter 9 is connected with one end of a train high-voltage direct current bus 10;
the cathode of the lithium titanate battery pack 1 is connected with one end of the other pole of the isolating switch 2, the other end of the other pole of the isolating switch 2 is respectively connected with the cathode of the voltage acquisition monitoring module 3 and one end of a cathode fuse 5, the other end of the cathode fuse 5 is connected with one end of a cathode contactor 8, the other end of the cathode contactor 8 is connected with one end of the cathode of the bidirectional DC/DC converter 9, and the other end of the cathode of the bidirectional DC/DC converter 9 is connected with one end of a grounding wire 11; the bidirectional DC/DC converter 9 is also connected with a train network module 12;
the BMS battery management system 13 is respectively connected with the lithium titanate battery pack 1, the isolating switch 2, the voltage acquisition monitoring module 3, the positive fuse 4, the negative fuse 5, the current acquisition monitoring module 6, the positive contactor 7, the negative contactor 8 and the bidirectional DC/DC converter 9;
the lithium titanate battery pack 1 is used for storing electric energy and converting the stored electric energy into kinetic energy required by the train to travel without a net;
the isolating switch 2 is used for manually cutting off the external output connection of the lithium titanate battery pack 1;
the voltage acquisition monitoring module 3 is used for monitoring the external output voltage value of the lithium titanate battery pack 1 and sending monitoring information to the BMS battery management system 13;
the positive fuse 4 and the negative fuse 5 are used for overload and short-circuit protection of a circuit;
the current acquisition monitoring module 6 is used for isolating high voltage and low voltage, sampling the charge and discharge current of the lithium titanate battery pack 1 and sending sampling information to the BMS battery management system 13;
the bidirectional DC/DC converter system 9 is in interactive communication with the BMS battery management system 13, and the bidirectional DC/DC converter system 9 is used for forwarding data collected from the train network module 12 to the BMS battery management system 13 and forwarding data collected from the BMS battery management system 13 to the train network module 12;
when the vehicle is not in a network and is self-walking, the bidirectional DC/DC converter system 9 is used for transmitting the electric energy of the lithium titanate battery pack 1 to the high-voltage direct current bus 10 of the train, and in the transmission process, the bidirectional DC/DC converter system 9 adjusts the voltage of the lithium titanate battery pack 1 to be within a voltage range suitable for working;
when the lithium titanate battery pack 1 needs to be charged, the bidirectional DC/DC converter system 9 is used for converting the electric energy of the direct current bus into a constant current source and a constant voltage source for charging the lithium titanate battery pack 1, and charging is carried out in a charging mode meeting the requirements of the BMS battery management system 13 or agreed;
the BMS battery management system 13 is used for acquiring data of the lithium titanate battery pack 1, the isolating switch 2, the voltage acquisition monitoring module 3, the positive fuse 4, the negative fuse 5, the current acquisition monitoring module 6, the positive contactor 7 and the negative contactor 8, and performing control, alarm, protection and the like;
the train high-voltage direct-current bus 10 serves as a storage battery output interface, a train high-voltage multi-section penetrating cable is only a transmission energy medium and can be replaced by different forms or methods;
the train network module 12 is used for being connected with a communication interface of a train microcomputer controller and carrying out information interaction with the bidirectional DC/DC converter system 9.
On the basis of the scheme, the lithium titanate battery pack 1, the isolating switch 2, the voltage acquisition monitoring module 3, the positive fuse 4, the negative fuse 5, the current acquisition monitoring module 6, the positive contactor 7, the negative contactor 8 and the BMS battery management system 13 can form an independent lithium titanate battery system.
On the basis of the technical scheme, the lithium titanate battery pack 1 adopts a lithium titanate battery which has high energy density, no memory effect and good low-temperature performance and safety performance.
On the basis of the technical scheme, the positive contactor 7 and the negative contactor 8 are supplied with power in a large capacity and a wide range and have bidirectional arc extinguishing capability, and the main contacts do not distinguish the contactors of the positive electrode and the negative electrode.
On the basis of the technical scheme, the BMS battery management system 13 adopts a BMS special for rail transit.
On the basis of the technical scheme, when the vehicle does not have a network and self-travels, the BMS battery management system 13 is used for receiving an instruction of the bidirectional DC/DC conversion system 9, controlling the positive contactor 7 and the negative contactor 8 to be closed, and controlling the lithium titanate battery pack 1 to be connected with one side of the bidirectional DC/DC conversion system 9;
meanwhile, the bidirectional DC/DC converter system 9 is used for inputting the electric energy of the lithium titanate battery pack 1 to the direct-current bus side; and the traction inverter converts the electric energy at the direct current bus side into the energy for the train to travel without a network.
The invention has the following beneficial technical effects:
the technical scheme of the invention can realize the netless self-walking of subways, motor trains and the like, the battery adopts a lithium titanate battery, and a Battery Management System (BMS) is configured, and the BMS can monitor the states of a netless self-walking storage battery and a direct-current bus bidirectional converter system for rail transit in real time; the train running reliability is improved, and the processing capacity of the train for treating emergency is enhanced. The invention is suitable for various rail transit vehicles, and is safe and reliable.
Drawings
The invention has the following drawings:
FIG. 1 is a schematic diagram of the system of the present invention.
Reference numerals:
the system comprises a 1-lithium titanate battery pack, a 2-isolating switch, a 3-voltage acquisition monitoring module, a 4-positive fuse, a 5-negative fuse, a 6-current acquisition monitoring module, a 7-positive contactor, an 8-negative contactor, a 9-bidirectional DC/DC converter, a 10-train high-voltage direct-current bus, an 11-grounding wire, a 12-train network module and a 13-BMS battery management system.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1, a netless self-walking storage battery and dc bus bidirectional converter system for rail transit includes: the system comprises a lithium titanate battery pack 1, an isolating switch 2, a voltage acquisition monitoring module 3, a positive fuse 4, a negative fuse 5, a current acquisition monitoring module 6, a positive contactor 7, a negative contactor 8, a bidirectional DC/DC converter 9, a train high-voltage direct current bus 10, a ground wire 11, a train network module 12 and a BMS battery management system 13;
the positive pole of the lithium titanate battery pack 1 is connected with one end of one pole of the isolating switch 2, the other end of the one pole of the isolating switch 2 is respectively connected with the positive pole of the voltage acquisition monitoring module 3 and one end of the negative fuse 4, the other end of the negative fuse 4 is connected with one end of the current acquisition monitoring module 6, the other end of the current acquisition monitoring module 6 is connected with one end of a positive pole contactor 7, the other end of the positive pole contactor 7 is connected with one end of the positive pole of a bidirectional DC/DC converter 9, and the other end of the positive pole of the bidirectional DC/DC converter 9 is connected with one end of a train high-voltage direct current bus 10;
the cathode of the lithium titanate battery pack 1 is connected with one end of the other pole of the isolating switch 2, the other end of the other pole of the isolating switch 2 is respectively connected with the cathode of the voltage acquisition monitoring module 3 and one end of a cathode fuse 5, the other end of the cathode fuse 5 is connected with one end of a cathode contactor 8, the other end of the cathode contactor 8 is connected with one end of the cathode of the bidirectional DC/DC converter 9, and the other end of the cathode of the bidirectional DC/DC converter 9 is connected with one end of a grounding wire 11; the bidirectional DC/DC converter 9 is also connected with a train network module 12;
the BMS battery management system 13 is respectively connected with the lithium titanate battery pack 1, the isolating switch 2, the voltage acquisition monitoring module 3, the positive fuse 4, the negative fuse 5, the current acquisition monitoring module 6, the positive contactor 7, the negative contactor 8 and the bidirectional DC/DC converter 9;
the lithium titanate battery pack 1 is used for storing electric energy and converting the stored electric energy into kinetic energy required by the train to travel without a net;
the isolating switch 2 is used for manually cutting off the external output connection of the lithium titanate battery pack 1;
the voltage acquisition monitoring module 3 is used for monitoring the external output voltage value of the lithium titanate battery pack 1 and sending monitoring information to the BMS battery management system 13;
the positive fuse 4 and the negative fuse 5 are used for overload and short-circuit protection of a circuit;
the current acquisition monitoring module 6 is used for isolating high voltage and low voltage, sampling the charge and discharge current of the lithium titanate battery pack 1 and sending sampling information to the BMS battery management system 13;
the bidirectional DC/DC converter system 9 is in interactive communication with the BMS battery management system 13, and the bidirectional DC/DC converter system 9 is used for forwarding data collected from the train network module 12 to the BMS battery management system 13 and forwarding data collected from the BMS battery management system 13 to the train network module 12;
when the vehicle is not in a network and is self-walking, the bidirectional DC/DC converter system 9 is used for transmitting the electric energy of the lithium titanate battery pack 1 to the high-voltage direct current bus 10 of the train, and in the transmission process, the bidirectional DC/DC converter system 9 adjusts the voltage of the lithium titanate battery pack 1 to be within a voltage range suitable for working;
when the lithium titanate battery pack 1 needs to be charged, the bidirectional DC/DC converter system 9 is used for converting the electric energy of the direct current bus into a constant current source and a constant voltage source for charging the lithium titanate battery pack 1, and charging is carried out in a charging mode meeting the requirements of the BMS battery management system 13 or agreed;
the BMS battery management system 13 is used for acquiring data of the lithium titanate battery pack 1, the isolating switch 2, the voltage acquisition monitoring module 3, the positive fuse 4, the negative fuse 5, the current acquisition monitoring module 6, the positive contactor 7 and the negative contactor 8, and performing control, alarm, protection and the like;
the train high-voltage direct-current bus 10 serves as a storage battery output interface, a train high-voltage multi-section penetrating cable is only a transmission energy medium and can be replaced by different forms or methods;
the train network module 12 is used for being connected with a communication interface of a train microcomputer controller and carrying out information interaction with the bidirectional DC/DC converter system 9.
On the basis of the scheme, the lithium titanate battery pack 1, the isolating switch 2, the voltage acquisition monitoring module 3, the positive fuse 4, the negative fuse 5, the current acquisition monitoring module 6, the positive contactor 7, the negative contactor 8 and the BMS battery management system 13 can form an independent lithium titanate battery system.
On the basis of the technical scheme, the lithium titanate battery pack 1 adopts a lithium titanate battery which has high energy density, no memory effect and good low-temperature performance and safety performance.
On the basis of the technical scheme, the positive contactor 7 and the negative contactor 8 are supplied with power in a large capacity and a wide range and have bidirectional arc extinguishing capability, and the main contacts do not distinguish the contactors of the positive electrode and the negative electrode.
On the basis of the technical scheme, the BMS battery management system 13 adopts a BMS special for rail transit.
On the basis of the technical scheme, when the vehicle does not have a network and self-travels, the BMS battery management system 13 is used for receiving an instruction of the bidirectional DC/DC conversion system 9, controlling the positive contactor 7 and the negative contactor 8 to be closed, and controlling the lithium titanate battery pack 1 to be connected with one side of the bidirectional DC/DC conversion system 9;
meanwhile, the bidirectional DC/DC converter system 9 is used for inputting the electric energy of the lithium titanate battery pack 1 to the direct-current bus side; and the traction inverter converts the electric energy at the direct current bus side into the energy for the train to travel without a network.
The technical scheme of the invention can realize the netless self-walking of subways, motor trains and the like, the battery adopts a lithium titanate battery, and a Battery Management System (BMS) is configured, and the BMS can monitor the states of a netless self-walking storage battery and a direct-current bus bidirectional converter system for rail transit in real time; the train running reliability is improved, and the processing capacity of the train for treating emergency is enhanced. The invention is suitable for various rail transit vehicles, and is safe and reliable.
It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention, and it will be obvious to those skilled in the art that other variations and modifications can be made on the basis of the above description, and all embodiments cannot be exhaustive, and obvious variations and modifications may be made within the scope of the present invention.
Those not described in detail in this specification are within the skill of the art.
Claims (6)
1. The utility model provides a two-way conversion system of no net self-propelled battery and direct current generating line for track traffic which characterized in that includes: the system comprises a lithium titanate battery pack (1), an isolating switch (2), a voltage acquisition monitoring module (3), an anode fuse (4), a cathode fuse (5), a current acquisition monitoring module (6), an anode contactor (7), a cathode contactor (8), a bidirectional DC/DC converter (9), a train high-voltage direct current bus (10), a grounding wire (11), a train network module (12) and a BMS battery management system (13);
the positive pole of the lithium titanate battery pack (1) is connected with one end of one pole of the isolating switch (2), the other end of one pole of the isolating switch (2) is connected with the positive pole of the voltage acquisition monitoring module (3) and one end of the negative fuse (4) respectively, the other end of the negative fuse (4) is connected with one end of the current acquisition monitoring module (6), the other end of the current acquisition monitoring module (6) is connected with one end of the positive pole contactor (7), the other end of the positive pole contactor (7) is connected with one end of the positive pole of the bidirectional DC/DC converter (9), and the other end of the positive pole of the bidirectional DC/DC converter (9) is connected with one end of the high-voltage direct current bus (10) of the train;
the negative pole of the lithium titanate battery pack (1) is connected with one end of the other pole of the isolating switch (2), the other end of the other pole of the isolating switch (2) is respectively connected with the negative pole of the voltage acquisition monitoring module (3) and one end of the negative fuse (5), the other end of the negative fuse (5) is connected with one end of a negative contactor (8), the other end of the negative contactor (8) is connected with one end of the negative pole of the bidirectional DC/DC converter (9), and the other end of the negative pole of the bidirectional DC/DC converter (9) is connected with one end of a grounding wire (11); the bidirectional DC/DC converter (9) is also connected with a train network module (12);
the BMS battery management system (13) is respectively connected with the lithium titanate battery pack (1), the isolating switch (2), the voltage acquisition monitoring module (3), the positive fuse (4), the negative fuse (5), the current acquisition monitoring module (6), the positive contactor (7), the negative contactor (8) and the bidirectional DC/DC converter (9);
the lithium titanate battery pack (1) is used for storing electric energy and converting the stored electric energy into kinetic energy required by the train to travel without a net;
the isolating switch (2) is used for manually cutting off the external output connection of the lithium titanate battery pack (1);
the voltage acquisition monitoring module (3) is used for monitoring the external output voltage value of the lithium titanate battery pack (1) and sending monitoring information to the BMS battery management system (13);
the positive fuse (4) and the negative fuse (5) are used for overload and short-circuit protection of a circuit;
the current acquisition monitoring module (6) is used for isolating high voltage and low voltage, sampling the charge and discharge current of the lithium titanate battery pack (1) and sending sampling information to the BMS battery management system (13);
the bidirectional DC/DC converter system (9) is in interactive communication with the BMS battery management system (13), and the bidirectional DC/DC converter system (9) is used for forwarding data collected from the train network module (12) to the BMS battery management system (13) and forwarding data collected from the BMS battery management system (13) to the train network module (12);
when the vehicle is not in a network and is self-walking, the bidirectional DC/DC converter system (9) is used for transmitting the electric energy of the lithium titanate battery pack (1) to the high-voltage direct current bus (10) of the train, and in the transmission process, the bidirectional DC/DC converter system (9) adjusts the voltage of the lithium titanate battery pack (1) to be in a voltage range suitable for working;
when the lithium titanate battery pack (1) needs to be charged, the bidirectional DC/DC converter system (9) is used for converting the electric energy of the direct current bus into a constant current source and a constant voltage source for charging the lithium titanate battery pack (1), and the charging mode meeting the requirements of the BMS battery management system (13) or being agreed is used for charging;
the BMS battery management system (13) is used for acquiring data of the lithium titanate battery pack (1), the isolating switch (2), the voltage acquisition monitoring module (3), the positive fuse (4), the negative fuse (5), the current acquisition monitoring module (6), the positive contactor (7) and the negative contactor (8), and performing control, alarm and protection;
the train high-voltage direct current bus (10) is used as a storage battery output interface;
the train network module (12) is used for being connected with a communication interface of a train microcomputer controller and carrying out information interaction with the bidirectional DC/DC converter system (9).
2. The netless self-propelled battery and dc bus bidirectional converter system for rail transit according to claim 1, characterized in that the lithium titanate battery pack (1), the isolating switch (2), the voltage acquisition monitoring module (3), the positive fuse (4), the negative fuse (5), the current acquisition monitoring module (6), the positive contactor (7), the negative contactor (8) and the BMS battery management system (13) can constitute an independent lithium titanate battery system.
3. The netless self-walking storage battery and direct-current bus bidirectional converter system for rail transit according to claim 1, wherein the lithium titanate battery pack (1) is a lithium titanate battery with high energy density, no memory effect, and good low-temperature performance and safety performance.
4. The netless self-propelled storage battery and direct-current bus bidirectional converter system for rail transit according to claim 1, wherein the positive contactor (7) and the negative contactor (8) adopt contactors with high capacity, wide power supply range, bidirectional arc extinguishing capability and no distinction between positive and negative poles by main contacts.
5. The netless self-propelled battery and dc bus bidirectional converter system for rail transit as claimed in claim 1, characterized in that the BMS battery management system (13) employs a rail transit-specific BMS.
6. The netless self-walking storage battery and direct-current bus bidirectional converter system for rail transit according to claim 1, wherein when the vehicle is netless self-walking, the BMS battery management system (13) is used for receiving an instruction of the bidirectional DC/DC converter system (9), controlling the positive contactor (7) and the negative contactor (8) to be closed, and controlling the lithium titanate battery pack (1) to be connected to one side of the bidirectional DC/DC converter system (9);
meanwhile, the bidirectional DC/DC converter system (9) is used for inputting the electric energy of the lithium titanate battery pack (1) to the direct-current bus side; and the traction inverter converts the electric energy at the direct current bus side into the energy for the train to travel without a network.
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