CN116545085A - Dual-output storage battery, power supply system and railway vehicle - Google Patents

Dual-output storage battery, power supply system and railway vehicle Download PDF

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Publication number
CN116545085A
CN116545085A CN202310368860.XA CN202310368860A CN116545085A CN 116545085 A CN116545085 A CN 116545085A CN 202310368860 A CN202310368860 A CN 202310368860A CN 116545085 A CN116545085 A CN 116545085A
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CN
China
Prior art keywords
state
battery
vehicle
controller
threshold
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202310368860.XA
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Chinese (zh)
Inventor
周卓敏
田庆
徐磊
李艳昆
李端凯
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CRRC Qingdao Sifang Co Ltd
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CRRC Qingdao Sifang Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
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Priority to CN202310368860.XA priority Critical patent/CN116545085A/en
Publication of CN116545085A publication Critical patent/CN116545085A/en
Pending legal-status Critical Current

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Classifications

    • 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
    • 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
    • H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
    • 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
    • H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
    • 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
    • H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
    • 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
    • H02J7/14—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from dynamo-electric generators driven at varying speed, e.g. on vehicle
    • H02J7/1469—Regulation of the charging current or voltage otherwise than by variation of field
    • H02J7/1492—Regulation of the charging current or voltage otherwise than by variation of field by means of controlling devices between the generator output and the battery
    • 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
    • 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

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (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 provides a double-output storage battery, a power supply system and a railway vehicle, wherein the double-output storage battery comprises: the system comprises an auxiliary battery, a traction battery, a bidirectional DC/DC module, a normally closed switch, a normally open switch, a first external terminal, a second external terminal and a controller; the controller is used for monitoring the state of the auxiliary battery and the state of the traction battery, acquiring the state of the vehicle-mounted charger and the power receiving state of the vehicle, sending a discharging instruction to the bidirectional DC/DC module to work and controlling the normally open switch to be closed based on the state of the auxiliary battery, the state of the traction battery, the state of the vehicle-mounted charger and the power receiving state of the vehicle, and controlling the traction battery to discharge to the auxiliary battery or the auxiliary battery to discharge to the traction battery according to the discharging instruction. The invention realizes the bidirectional flow of energy between the traction battery and the auxiliary battery.

Description

Dual-output storage battery, power supply system and railway vehicle
Technical Field
The invention relates to the technical field of railway vehicles, in particular to a double-output storage battery, a power supply system and a railway vehicle.
Background
Railway vehicles such as subways and motor cars are considered as the most green traffic mode due to the characteristics of large passenger capacity, high speed, safety, environmental protection, energy conservation and the like. The reliability of the power supply system of the vehicle is particularly important due to the large passenger capacity. When the power supply network fails or the power cannot be received due to the failure of equipment of the vehicle, the vehicle loses traction power. The faulty vehicle needs to wait for the rescue vehicle in place to pull the faulty vehicle to the next station for evacuating passengers, which will greatly affect the passenger travel efficiency and the punctuality of the operation of the passenger transport system. If the storage battery can be used as a power supply for the self-walking of the vehicle, after the power failure of the vehicle, the storage battery does not need to wait for rescue, and can automatically draw passengers to the next station for evacuation, so that the travel influence on the passengers is reduced.
In addition to the above-mentioned self-walking power supply requirement, when the power supply network of the vehicle fails or the vehicle cannot receive power due to the failure of its own equipment, an auxiliary standby power supply is also required to ensure auxiliary functions such as emergency lighting and communication.
At present, a rail vehicle is provided with a DC110V low-voltage storage battery as an auxiliary standby power supply, but if the DC110V low-voltage storage battery is used for power supply under the two working conditions (a self-walking power supply and the auxiliary standby power supply), the following problems are encountered:
when the railway vehicle is in emergency traction, the required power is larger (generally more than 300 kW), if the DC110V low-voltage storage battery is used for power supply, the output current of the battery is larger, and the loss on the circuit is larger; (2) The selection of the electrical components on the main circuit requires the selection of products with larger rated currents, and the weight, volume and cost of the components are increased. In order to improve the power supply efficiency and reduce the cost, the self-walking power supply is required to be provided with a high-voltage battery, and the auxiliary standby power supply still adopts the existing DC110V low-voltage battery.
In the prior art, a system (see fig. 1) for a self-walking two-way output storage battery and a two-way charger of rail transit is proposed. In this embodiment, the high-voltage battery 8, the first low-voltage battery 9 and the second low-voltage battery 10 are simultaneously arranged in the battery device. The high-voltage battery 8 is connected to the middle direct current link of the bidirectional charger, and can supply power to an AC380V auxiliary load through the first bidirectional AC/DC module 1 and the second bidirectional AC/DC module 2, can supply power to the auxiliary load and two low-voltage batteries through the first unidirectional DC/DC module 3 and the second unidirectional DC/DC module 4, and can directly supply power to the traction inverter through the first contactor 13 and the second contactor 14 to realize the networking-free self-walking. The first low-voltage battery 9 and the second low-voltage battery 10 are both connected to the DC110V output side of the bidirectional charger, and mainly serve to supply power to auxiliary loads when the bidirectional charger fails.
The technical problems of the scheme are as follows:
(1) The energy between the high-voltage battery and the low-voltage battery can only flow unidirectionally, and the current can only flow from the high-voltage battery to the low-voltage battery and can not flow from the low-voltage battery to the high-voltage battery. When the high-voltage battery is insufficient in capacity and the high-voltage battery is left in capacity, the high-voltage battery cannot be discharged through the high-voltage battery, so that the battery capacity can be effectively utilized, and the configuration of the battery electric quantity is reduced.
(2) In the above scheme, the AC/DC module has a bidirectional conversion function (AC- > DC and DC- > AC) and has a function of charging the battery. In a charger generally used for a railway vehicle, the AC/DC module has only a unidirectional conversion (AC- > DC) function and has no function of charging a battery. Therefore, in the scheme, the circuit structure and the function of the bidirectional charger are inconsistent with those of the existing charger on the railway vehicle, and the charger needs to be redeveloped to realize the function in the scheme, so that the research and development cost is increased.
Disclosure of Invention
The invention provides a double-output storage battery, a power supply system and a railway vehicle, which are used for solving the problem that in the double-output storage battery in the prior art, energy between a high-voltage battery and a low-voltage battery can only flow in one direction.
The invention provides a double-output storage battery, comprising: the system comprises an auxiliary battery, a traction battery, a bidirectional DC/DC module, a normally closed switch, a normally open switch, a first external terminal, a second external terminal and a controller;
the auxiliary battery is connected with the bidirectional DC/DC module and the first external terminal through a normally closed switch, the traction battery is connected with the bidirectional DC/DC module and the second external terminal through a normally open switch, and the first external terminal is used for being connected with an auxiliary load output end of the vehicle-mounted charger;
the controller is used for monitoring the state of the auxiliary battery and the state of the traction battery, acquiring the state of the vehicle-mounted charger and the power receiving state of the vehicle, sending a discharging instruction to the bidirectional DC/DC module to work and controlling the normally open switch to be closed based on the state of the auxiliary battery, the state of the traction battery, the state of the vehicle-mounted charger and the power receiving state of the vehicle, and controlling the traction battery to discharge to the auxiliary battery or the auxiliary battery to discharge to the traction battery according to the discharging instruction.
According to the present invention, there is provided a two-way output storage battery, the controller comprising: the first controller, the second controller and the third controller are in communication connection;
The second controller is used for monitoring the state of the traction battery and sending the state of the traction battery to the first controller;
the first controller is used for monitoring the state of the auxiliary battery and acquiring the state of the vehicle-mounted charger and the power receiving state of the vehicle;
the first controller is further used for sending a discharging instruction to the third controller based on the state of the auxiliary battery, the state of the traction battery, the state of the vehicle-mounted charger and the power receiving state of the vehicle, and controlling the normally open switch to be closed, and the third controller is used for controlling the bidirectional DC/DC module to work according to the discharging instruction so as to enable the traction battery to discharge to the auxiliary battery or enable the auxiliary battery to discharge to the traction battery.
According to the double-output storage battery provided by the invention, the first controller is specifically used for sending a first discharging instruction to the third controller and controlling the normally open switch to be closed when the state of the vehicle-mounted charger is output interruption, the auxiliary battery is in a discharging state, the state of charge of the auxiliary battery is smaller than a first threshold value, and the state of charge of the traction battery is larger than a second threshold value, and the third controller is used for controlling the bidirectional DC/DC module to work according to the first discharging instruction so as to discharge the traction battery to the auxiliary battery;
The first controller is further specifically configured to control the normally open switch to be closed when the vehicle power receiving state is a fault, so that the traction battery enters a discharging state, and send a second discharging instruction to the third controller when the state of charge of the traction battery is smaller than a third threshold and the state of charge of the auxiliary battery is larger than a fourth threshold, where the third controller is configured to control the bidirectional DC/DC module to operate according to the second discharging instruction, so that the auxiliary battery discharges to the traction battery;
the first threshold and the third threshold are both less than the second threshold and the fourth threshold.
According to the two-way output storage battery provided by the invention, the first controller is further used for controlling the normally closed switch to be disconnected under the condition that the auxiliary battery is in a discharging state and the state of charge of the auxiliary battery is smaller than a fifth threshold value or the state of the auxiliary battery is in a fault state, and the fifth threshold value is smaller than the first threshold value.
According to the double-output storage battery provided by the invention, the second controller is further used for controlling the normally open switch to be disconnected under the condition that the traction battery is in a discharging state and the state of charge of the traction battery is smaller than a sixth threshold value or the state of the traction battery is in a fault state, and the sixth threshold value is smaller than the third threshold value.
According to the double-output storage battery provided by the invention, the first threshold value is 20% -25%, the second threshold value is 48% -52%, the third threshold value is 20% -25%, and the fourth threshold value is 48% -52%.
According to the double-output storage battery provided by the invention, the first controller is also used for sending a charging instruction to the vehicle-mounted charger to enable the vehicle-mounted charger to charge the auxiliary battery under the condition that the vehicle-mounted charger state and the vehicle power receiving state are normal and the charge state of the auxiliary battery is smaller than the seventh threshold value.
According to the double-output storage battery provided by the invention, the first controller is further used for controlling the normally open switch to be closed and sending a charging instruction to the third controller when the state of the vehicle-mounted charger and the state of the vehicle power receiving are normal, the state of charge of the auxiliary battery is larger than or equal to a seventh threshold value, the state of charge of the traction battery is smaller than an eighth threshold value, the third controller receives the charging instruction and then controls the bidirectional DC/DC module to receive the electric energy of the vehicle-mounted charger transmitted by the first external terminal, the bidirectional DC/DC module charges the traction battery after adjusting the electric energy according to the charging instruction, and the second controller controls the normally open switch to be opened when the state of charge of the traction battery is larger than a ninth threshold value, and the ninth threshold value is larger than the eighth threshold value.
The invention also provides a power supply system, comprising: the auxiliary load direct current bus, traction direct current bus, N transfer switches, N vehicle-mounted chargers and N double-circuit output storage batteries of any one of the above, an ith power supply subsystem is formed by the ith double-circuit output storage battery and the ith vehicle-mounted chargers, a first external terminal of the ith double-circuit output storage battery and an auxiliary load output end of the ith vehicle-mounted charger are both connected with the auxiliary load direct current bus, a second external terminal of the ith double-circuit output storage battery is connected with the traction direct current bus through the ith transfer switch, and the ith transfer switch is closed when receiving a trigger signal that the power-on state of a vehicle sent by a cab is a fault, wherein N is more than or equal to 1, i=1, 2, … and N.
The invention also provides a rail vehicle comprising: the power supply system of any of the above.
According to the double-output storage battery, the power supply system and the railway vehicle, in the double-output storage battery, the auxiliary battery is connected with the bidirectional DC/DC module and the first external terminal through the normally closed switch, the traction battery is connected with the bidirectional DC/DC module and the second external terminal through the normally open switch, the first external terminal is used for being connected with the vehicle-mounted charger, a discharging instruction is sent to the third controller through the first controller based on the state of the auxiliary battery, the state of the traction battery, the state of the vehicle-mounted charger and the power receiving state of the vehicle, and the normally open switch is controlled to be closed, the third controller is used for controlling the bidirectional DC/DC module to work according to the discharging instruction, so that the traction battery discharges to the auxiliary battery, or the auxiliary battery discharges to the traction battery, bidirectional flow of energy between the traction battery and the auxiliary battery is achieved, the electric quantity of the two batteries is complementary, on the basis, the electric quantity configuration of the auxiliary battery can be moderately reduced when the battery is designed, configuration optimization is achieved, the battery weight and the battery volume are also reduced.
Drawings
In order to more clearly illustrate the invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a prior art power supply system based on a dual output battery;
FIG. 2 is a schematic diagram of a dual output battery according to the present invention;
FIG. 3 is a schematic diagram of a power supply system based on a dual output battery according to the present invention;
fig. 4 is a schematic structural diagram of another power supply system based on a dual output battery according to the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 2, the two-way output battery according to the embodiment of the present invention includes: auxiliary battery 110, traction battery 120, bi-directional DC/DC module 130, normally closed switch K1, normally open switch K2, first external terminal 140, second external terminal 150, and controller. The auxiliary battery 110 is a DC110V low-voltage battery, and the traction battery 120 is a high-voltage battery, which is used for providing power for the vehicle to walk by itself when the power reception of the vehicle is abnormal.
The auxiliary battery 110 is connected to the bidirectional DC/DC module 130 and the first external terminal 140 through a normally closed switch K1, and the traction battery 120 is connected to the bidirectional DC/DC module 130 and the second external terminal 150 through a normally open switch K2. Referring to fig. 3, a first external terminal 140 is used for connecting with an auxiliary load output end of the vehicle-mounted charger 200, and a second external terminal 150 is used for connecting with a traction dc bus. After the first external terminal 140 is connected with the auxiliary load output end of the vehicle-mounted charger 200, the normally closed switch K1 is in a normally closed state when the two-way output storage battery is in a normal working state.
The controller is configured to monitor a state of the auxiliary battery 110 and a state of the traction battery 120, and obtain a vehicle-mounted charger state and a vehicle power receiving state, and further configured to send a discharge command to the bidirectional DC/DC module 130 based on the state of the auxiliary battery 110, the state of the traction battery 120, the vehicle-mounted charger state and the vehicle power receiving state, and control the normally open switch K2 to be closed, and the bidirectional DC/DC module 130 controls the traction battery 120 to discharge to the auxiliary battery 110 or the auxiliary battery 110 to discharge to the traction battery 120 according to the discharge command. Therefore, bidirectional flow of energy between the traction battery 120 and the auxiliary battery 110 is realized, and the electric quantity of the traction battery 120 and the auxiliary battery 110 are complementary, so that the electric quantity configuration of the auxiliary battery 110 can be moderately reduced when the battery is designed, configuration optimization is realized, the battery cost is reduced, and the battery weight and the battery volume are also reduced.
Specifically, the controller is specifically configured to send a first discharging instruction to the bidirectional DC/DC module 130 and control the normally open switch K2 to be closed when the vehicle-mounted charger state is an output interrupt, the auxiliary battery 110 is in a discharging state, and the state of charge of the auxiliary battery 110 is smaller than a first threshold, and the state of charge of the traction battery 120 is larger than a second threshold, and the bidirectional DC/DC module 130 controls the traction battery 120 to discharge to the auxiliary battery 110 according to the first discharging instruction. Specifically, the bi-directional DC/DC module 130 charges the auxiliary battery 110 after reducing the traction battery 120 output voltage to 110V. To ensure that electrical energy flows from traction battery 120 to auxiliary battery 110, the second threshold is greater than the first threshold. It should be noted that: the output of the auxiliary battery 110 is directly connected with the output end of the auxiliary load of the vehicle-mounted charger 200, the output voltages are equal and are all DC110V, and the normally closed switch K1 is kept closed, so that when the vehicle-mounted charger is in an output interruption state, the auxiliary battery 110 is automatically switched to a discharging state to supply power for the auxiliary load.
The controller is further specifically configured to control the normally open switch K2 to be closed when the vehicle power receiving state is a fault, so that the traction battery 120 enters a discharging state, and send a second discharging instruction to the bidirectional DC/DC module 130 when the state of charge of the traction battery 120 is smaller than a third threshold and the state of charge of the auxiliary battery 110 is larger than a fourth threshold, and the bidirectional DC/DC module 130 controls the auxiliary battery 110 to discharge to the traction battery 120 according to the second discharging instruction. Specifically, the bi-directional DC/DC module 130 boosts the 110V voltage output from the auxiliary battery 110 and charges the traction battery 120. To ensure that the electrical energy auxiliary battery 110 flows from the traction battery 120, the fourth threshold is greater than the third threshold. Specifically, when the power receiving state of the vehicle is a fault, the vehicle driving voltage cannot be loaded on the traction direct current bus, and the vehicle cannot be driven, at this time, the controller controls the normally open switch K2 to be closed, so that the traction battery 120 enters a discharging state to supply power to the traction direct current bus, and the vehicle is driven to walk automatically.
In some embodiments, the controller is further configured to control the normally closed switch K1 to be turned off when the auxiliary battery 110 is in a discharged state and the state of charge of the auxiliary battery 110 is less than a fifth threshold, or when the state of the auxiliary battery 110 is a fault, the fifth threshold being less than the first threshold. The fifth threshold may be 5% to 10%, for example: when the state of charge of the auxiliary battery 110 is less than 5% or the state of the auxiliary battery 110 is a fault, the normally closed switch K1 is opened to protect the auxiliary battery 110. It should be noted that: in addition to the working conditions, when the vehicle finishes running and the whole vehicle is powered off, the normally-closed switch K1 is also turned off, so that the whole vehicle is in a powered-off state.
In some embodiments, the controller is further configured to control the normally open switch K2 to open when the traction battery 120 is in a discharged state and the state of charge of the traction battery 120 is less than a sixth threshold, or when the state of the traction battery is faulty, the sixth threshold being less than the third threshold. The sixth threshold may be 5% to 10%, for example: in the event that the state of charge of traction battery 120 is less than 5% or the state of traction battery 120 is faulty, the normally open switch K2 that was previously closed is opened to protect traction battery 120.
In some embodiments, the controller is further configured to send a charging instruction to the vehicle-mounted charger 200 to enable the vehicle-mounted charger 200 to charge the auxiliary battery 110 when the vehicle-mounted charger state and the vehicle power receiving state are both normal and the state of charge of the auxiliary battery 110 is less than the seventh threshold. Specifically, the seventh threshold may be 80% -90%, if the state of charge of the auxiliary battery 110 is lower than 80% -90%, the battery is free from faults, the vehicle is powered normally, and the state of the charger is normal, the controller sends a charging instruction including a charging mode, a charging current and a charging voltage to the vehicle-mounted charger 200 according to a preset charging control logic. The vehicle-mounted charger 200 outputs a voltage and a current according to the charging command to charge the auxiliary battery 110. The auxiliary battery 110 is automatically in a constant voltage float state after being fully charged. By charging the auxiliary battery 110 by the vehicle-mounted charger 200 under the condition that the vehicle-mounted charger state and the vehicle power receiving state are normal, the auxiliary battery 110 is ensured to be always in a state with sufficient electric quantity, so that the auxiliary battery 110 automatically supplies power to an auxiliary load when the vehicle-mounted charger 200 has output interruption.
In some embodiments, the controller is further configured to control the normally open switch K2 to be closed and send a charging instruction to the bidirectional DC/DC module 130 when the vehicle-mounted charger state and the vehicle power receiving state are normal, and the state of charge of the auxiliary battery 110 is greater than or equal to a seventh threshold, and the bidirectional DC/DC module 130 receives the charging instruction and then receives the electric energy of the vehicle-mounted charger 200 transmitted by the first external terminal, and the bidirectional DC/DC module 130 adjusts the electric energy according to the charging instruction and charges the traction battery 120, and when the state of charge of the traction battery 120 is greater than a ninth threshold, the controller controls the normally open switch K2 to be opened, and the ninth threshold is greater than the eighth threshold. The seventh threshold and the eighth threshold may be 80% -90%, and the ninth threshold may be 95%. The state of charge of the auxiliary battery 110 is greater than or equal to the seventh threshold, which indicates that the auxiliary battery 110 is in a full state, and when the state of charge of the traction battery 120 is less than the eighth threshold and the state of charge of the vehicle-mounted charger is normal, the electric energy of the vehicle-mounted charger 200 can charge the traction battery 120 through the bidirectional DC/DC module 130. Specifically, the controller sends the bidirectional DC/DC module 130 a signal according to a preset charge control logic, including: a charge command for the charge voltage and charge current, according to which the bi-directional DC/DC module 130 outputs a voltage and current to charge the traction battery 120. When the state of charge of the traction battery 120 is greater than the ninth threshold (e.g., 95%), the controller controls the normally open switch K2 to be opened to stop charging the traction battery 120, indicating that the traction battery 120 is in the full state.
The controller may be a controller that controls and monitors auxiliary battery 110, traction battery 120, and bi-directional DC/DC module 130. In order to save cost and reduce volume, the controllers of the auxiliary battery 110, the traction battery 120 and the bidirectional DC/DC module 130 are directly utilized, and only one of the controllers is needed to be used as a main controller. Thus, in some embodiments, the controller comprises: the first controller 111, the second controller 121, and the third controller 131, the first controller 111 is disposed inside the auxiliary battery 110, the second controller 121 is disposed inside the traction battery 120, and the third controller 131 is disposed inside the bidirectional DC/DC module 130. The first controller 111, the second controller 121, and the third controller 131 are communicatively connected, and specifically, the first controller 111, the second controller 121, and the third controller 131 are connected through the whole vehicle network of the vehicle to achieve mutual communication. The second controller 121 has battery state monitoring, fault protection, charge control, and communication functions with the outside. The first controller 111 serves as a main controller, and has functions of high-voltage and low-voltage battery coordination control and whole vehicle communication in addition to the functions of the second controller 121. The third controller 131 is configured to receive an instruction from the first controller 111, and control an output voltage, an output current, and an operation mode of the bidirectional DC/DC module 130.
Specifically, the second controller 121 is configured to monitor the state of the traction battery 120 and send the state of the traction battery 120 to the first controller 111. The state of traction battery 120 includes its state of charge, whether it is faulty, etc.
The first controller 111 is configured to monitor the state of the auxiliary battery 110, and obtain the state of the vehicle-mounted charger (normal or output interrupt) and the vehicle power receiving state (power receiving normal or failure), where the state of the auxiliary battery 110 includes the state of charge thereof, and whether it is a failure or not. The first controller 111 acquires a vehicle-mounted charger state and a vehicle power receiving state through the whole vehicle network.
The first controller 111 is further configured to send a discharge command to the third controller 131 and control the normally open switch K2 to be closed based on the state of the auxiliary battery 110, the state of the traction battery 120, the state of the vehicle-mounted charger, and the vehicle power receiving state. The third controller 131 is configured to control the bidirectional DC/DC module 130 to operate according to the discharging instruction, so that the traction battery 120 is discharged to the auxiliary battery 110, or the auxiliary battery 110 is discharged to the traction battery 120.
In this embodiment, the first controller 111 is specifically configured to send a first discharging instruction to the third controller 131 and control the normally open switch K2 to be closed when the vehicle-mounted charger status is an output interrupt, the auxiliary battery 110 is in a discharging state, and the state of charge of the auxiliary battery 110 is smaller than a first threshold, and the state of charge of the traction battery 120 is larger than a second threshold, and the third controller 131 is configured to control the bidirectional DC/DC module 130 to operate according to the first discharging instruction, so that the traction battery 120 discharges to the auxiliary battery 110. Specifically, the bi-directional DC/DC module 130 charges the auxiliary battery 110 after reducing the traction battery 120 output voltage to 110V. To ensure that electrical energy flows from traction battery 120 to auxiliary battery 110, the second threshold is greater than the first threshold. It should be noted that: the output of the auxiliary battery 110 is directly connected with the output end of the auxiliary load of the vehicle-mounted charger 200, the output voltages are equal and are all DC110V, and the normally closed switch K1 is kept closed, so that when the vehicle-mounted charger is in an output interruption state, the auxiliary battery 110 is automatically switched to a discharging state to supply power for the auxiliary load.
The first controller 111 is further specifically configured to control the normally open switch K2 to be closed when the vehicle power receiving state is a fault, so that the traction battery 120 enters a discharging state, and send a second discharging instruction to the third controller 131 when the state of charge of the traction battery 120 is smaller than a third threshold and the state of charge of the auxiliary battery 110 is larger than a fourth threshold, where the third controller 131 is configured to control the bidirectional DC/DC module 130 to operate according to the second discharging instruction, so that the auxiliary battery 110 discharges to the traction battery 120. Specifically, the bi-directional DC/DC module 130 boosts the 110V voltage output from the auxiliary battery 110 and charges the traction battery 120. To ensure that the electrical energy auxiliary battery 110 flows from the traction battery 120, the fourth threshold is greater than the third threshold. Specifically, when the vehicle power receiving state is a fault, the vehicle driving voltage cannot be loaded on the traction dc bus, and the vehicle cannot be driven, at this time, the first controller 111 controls the normally open switch K2 to be closed, so that the traction battery 120 enters a discharging state, and supplies power to the traction dc bus, so as to drive the vehicle to walk.
Since the fourth threshold of the state of charge of the auxiliary battery 110 is a value satisfying the condition that the auxiliary battery 110 discharges to the auxiliary battery 110, the fourth threshold is larger than the first threshold, and similarly, the second threshold is larger than the third threshold. Preferably, the first threshold is 20% -25%, the second threshold is 48% -52%, the third threshold is 20% -25%, and the fourth threshold is 48% -52%. In this embodiment, the first controller 111 realizes accurate control of the bidirectional flow of energy between the traction battery 120 and the auxiliary battery 110 according to the state of charge of each battery and the preset state of charge threshold.
In some embodiments, the first controller 111 is further configured to control the normally closed switch K1 to be turned off when the auxiliary battery 110 is in a discharging state and the state of charge of the auxiliary battery 110 is less than a fifth threshold, or when the state of the auxiliary battery 110 is a fault, the fifth threshold being less than the first threshold. The fifth threshold may be 5% to 10%, for example: when the state of charge of the auxiliary battery 110 is less than 5% or the state of the auxiliary battery 110 is a fault, the normally closed switch K1 is opened to protect the auxiliary battery 110. It should be noted that: in addition to the working conditions, when the vehicle finishes running and the whole vehicle is powered off, the normally-closed switch K1 is also turned off, so that the whole vehicle is in a powered-off state.
In some embodiments, the second controller 121 is further configured to control the normally open switch K2 to open when the traction battery 120 is in a discharged state and the state of charge of the traction battery 120 is less than a sixth threshold, or when the state of the traction battery is faulty, the sixth threshold being less than the third threshold. The sixth threshold may be 5% to 10%, for example: in the event that the state of charge of traction battery 120 is less than 5% or the state of traction battery 120 is faulty, the normally open switch K2 that was previously closed is opened to protect traction battery 120.
In some embodiments, the first controller 111 is further configured to send a charging instruction to the vehicle-mounted charger 200 to enable the vehicle-mounted charger 200 to charge the auxiliary battery 110 when the vehicle-mounted charger state and the vehicle power receiving state are both normal and the state of charge of the auxiliary battery 110 is less than the seventh threshold. Specifically, the seventh threshold may be 80% -90%, if the state of charge of the auxiliary battery 110 is lower than 80% -90%, the battery is free from faults, the vehicle is powered normally, and the state of the charger is normal, the first controller 111 sends a charging instruction including a charging mode, a charging current and a charging voltage to the vehicle-mounted charger 200 according to a preset charging control logic. The vehicle-mounted charger 200 outputs a voltage and a current according to the charging command to charge the auxiliary battery 110. The auxiliary battery 110 is automatically in a constant voltage float state after being fully charged. By charging the auxiliary battery 110 by the vehicle-mounted charger 200 under the condition that the vehicle-mounted charger state and the vehicle power receiving state are normal, the auxiliary battery 110 is ensured to be always in a state with sufficient electric quantity, so that the auxiliary battery 110 automatically supplies power to an auxiliary load when the vehicle-mounted charger 200 has output interruption.
In some embodiments, the first controller 111 is further configured to control the normally open switch K2 to be closed and send a charging instruction to the third controller 131 when the vehicle-mounted charger state and the vehicle power receiving state are normal, the state of charge of the auxiliary battery 110 is greater than or equal to a seventh threshold, the state of charge of the traction battery 120 is less than an eighth threshold, the third controller 131 receives the charging instruction and then controls the bidirectional DC/DC module 130 to receive the electric energy of the vehicle-mounted charger 200 transmitted by the first external terminal, the bidirectional DC/DC module 130 adjusts the electric energy according to the charging instruction and then charges the traction battery 120, and the second controller 121 controls the normally open switch K2 to be opened when the state of charge of the traction battery 120 is greater than the ninth threshold, and the ninth threshold is greater than the eighth threshold. The seventh threshold and the eighth threshold may be 80% -90%, and the ninth threshold may be 95%. The state of charge of the auxiliary battery 110 is greater than or equal to the seventh threshold, which indicates that the auxiliary battery 110 is in a full state, and when the state of charge of the traction battery 120 is less than the eighth threshold and the state of charge of the vehicle-mounted charger is normal, the electric energy of the vehicle-mounted charger 200 can charge the traction battery 120 through the bidirectional DC/DC module 130. Specifically, the first controller 111 sends, according to a preset charging control logic, a signal including: a charge command for the charge voltage and charge current, according to which the bi-directional DC/DC module 130 outputs a voltage and current to charge the traction battery 120. When the state of charge of the traction battery 120 is greater than the ninth threshold (e.g., 95%), indicating that the traction battery 120 is in the full state, the second controller 121 controls the normally open switch K2 to be opened, and stops charging the traction battery 120. It should be noted that: the second external terminal 150 of the two-way output storage battery is connected with the traction direct current bus through the change-over switch, and when the power receiving state of the vehicle is normal, the change-over switch is opened, and the traction direct current bus supplies power to the vehicle, at this time, even if the normally open switch K2 is closed, the traction battery 120 is not communicated with the traction direct current bus.
Under the condition that the vehicle-mounted charger state and the vehicle power receiving state are normal, the vehicle-mounted charger 200 and the bidirectional DC/DC module 130 charge the traction battery 120, so that the traction battery 120 is always in a state with sufficient electric quantity, and the traction battery 120 can provide electric energy for the vehicle to walk by itself when the vehicle power receiving state is a fault. In addition, the bidirectional DC/DC module 130 can boost the DC110V output by the vehicle-mounted charger 200 and then charge the traction battery 120, so that the dual-output storage battery can be directly connected to the auxiliary load output end of the existing vehicle-mounted charger 200, the high-voltage traction battery 120 can be charged without re-developing the corresponding charger, and the development cost of the dual-output storage battery is reduced.
It should be noted that: the bidirectional discharging between the auxiliary battery 110 and the traction battery 120 and the charging of the auxiliary battery 110 and the traction battery 120 by the vehicle-mounted charger 200 are all performed under the condition that the respective states of the auxiliary battery 110 and the traction battery 120 are fault-free, and when the first controller 111 monitors that the state of the auxiliary battery 110 or the traction battery 120 is fault, the first controller can disconnect K1 or K2 and send corresponding fault alarm information to the cab through the whole vehicle network. The auxiliary battery 110 and the traction battery 120 may also employ different types of batteries, respectively, depending on the characteristics of the auxiliary load and the traction load. Such as: the traction battery 120 is a high-rate lithium titanate battery, and the auxiliary battery 110 is a conventional nickel-cadmium battery or a lead-acid battery. The auxiliary battery 110, the traction battery 120, and the bi-directional DC/DC module 130 may be integrated in one case, improving integration, reducing equipment interfaces, and reducing overall weight. The auxiliary battery 110, the traction battery 120, and the bidirectional DC/DC module 130 may also be respectively installed in different cases according to the installation space of the whole vehicle. The normally closed switch K1 and the normally open switch K2 are contactors.
Referring to fig. 2, 3 and 4, the present invention also provides a power supply system, as shown in fig. 3 and 4, including: the auxiliary load direct current bus 300, the traction direct current bus 400, the N transfer switches K4, the N vehicle-mounted chargers 200 and the N double-circuit output storage batteries 100, the ith double-circuit output storage battery 100 and the ith vehicle-mounted chargers 200 form an ith power supply system, the first external terminal 140 of the ith double-circuit output storage battery 100 and the auxiliary load output end of the ith vehicle-mounted chargers 200 are both connected with the auxiliary load direct current bus 300, the second external terminal 150 of the ith double-circuit output storage battery 100 is connected with the traction direct current bus 400 through the ith transfer switch K4, the ith transfer switch K4 is closed when receiving a trigger signal that the power receiving state of the vehicle sent by a cab is fault, namely, the ith transfer switch K4 is in a normally open state under other conditions after the vehicle is electrified, so that the traction battery 120 is prevented from being communicated with the traction direct current bus 400. Wherein, N is greater than or equal to 1, i=1, 2, …, N. Specifically, the vehicle-mounted charger 200 is an existing vehicle-mounted charger, and includes: unidirectional AC/DC module 210 and unidirectional DC/DC module 220, unidirectional AC/DC module 210 connects the AC380V power supply network of the vehicle through switch K3 (specifically contactor), unidirectional AC/DC module 210 and unidirectional DC/DC module 220 are connected in series, unidirectional DC/DC module 220's output terminal connects auxiliary load direct current bus 300. When the power receiving state of the vehicle is a fault, a driver in the cab presses a self-walking control button of the vehicle, the button is connected with an ith change-over switch K4 in a hard wire mode, and when the button is pressed, the ith change-over switch K4 is closed. Meanwhile, a signal (a signal indicating that the power-on state of the vehicle is a fault) pressed by the button is sent to the controller through the whole vehicle network, and the controller controls the normally open switch K2 to be closed.
In fig. 4, the ith two-way output battery 100 and the ith vehicle-mounted charger 200 form an ith power supply subsystem, and a plurality of groups of power supply subsystems form a parallel connection mode, so that the redundancy of the system is improved.
The power supply system consists of the existing vehicle-mounted charger 200 and the double-output storage battery 100 in the embodiment, so that bidirectional flow of energy between the traction battery 120 and the auxiliary battery 110 is realized, the electric quantity of the two batteries is complementary, and the power supply system is simple in integral structure and low in research and development cost.
Referring to fig. 2, 3 and 4, based on the power supply system, the auxiliary battery 110 and the traction battery 120 have the following operation modes:
1. auxiliary battery 110 charges:
the first controller 111 monitors the state of charge and the fault state of the auxiliary battery 110.
The first controller 111 communicates with the whole vehicle to acquire a vehicle power receiving state and a vehicle-mounted charger state.
If the state of charge of the auxiliary battery 110 is lower than the seventh threshold (e.g., 90%), the battery is not failed, the vehicle is powered normally, and the state of the charger is normal, the first controller 111 sends charging instructions such as a charging mode, a charging current, a charging voltage, etc. to the vehicle-mounted charger 200 according to a preset charging control logic. The vehicle-mounted charger 200 outputs voltage and current according to the instruction to charge the auxiliary battery 110. The auxiliary battery 110 is in a constant voltage float state after being fully charged.
2. Auxiliary battery 110 discharges:
when the state of the vehicle-mounted charger is fault or the AC380V power supply network is fault, the output of the vehicle-mounted charger 200 is interrupted, and the auxiliary battery 110 is connected to the DC110V direct current bus (auxiliary load direct current bus) for floating charging, so that the auxiliary battery 110 can directly and uninterruptedly supply power to the DC110V direct current bus. The first controller 111 monitors the state of charge and the fault state of the auxiliary battery 110 in real time.
When the auxiliary battery 110 is in a discharging state and the state of charge of the auxiliary battery 110 is smaller than a preset first threshold (for example, the state of charge is less than 20%), and the state of charge of the traction battery 120 is larger than a preset second threshold (for example, the state of charge is greater than 50%), the first controller 111 sends a first discharging instruction to the third controller 131, and the third controller 131 is configured to control the bidirectional DC/DC module 130 to operate according to the first discharging instruction, so that the traction battery 120 discharges to the auxiliary battery 110.
When the auxiliary battery 110 fails or the state of charge thereof is lower than a preset fifth threshold (e.g., the state of charge < 5%), the first controller 111 controls the normally-closed switch K1 to be turned off, thereby protecting the auxiliary battery 110.
3. Traction battery 120 charges:
the second controller 121 monitors the state of charge of the traction battery 120 and transmits the state of charge of the traction battery 120 to the first controller 111.
The first controller 111 monitors the state of charge of the auxiliary battery 110, and also obtains the operating state of the bidirectional DC/DC module 130 through an internal network, and obtains the vehicle power receiving state and the vehicle-mounted charger state through communication with the whole vehicle.
If the following conditions are simultaneously satisfied: the method includes (1) the state of charge of the traction battery 120 is lower than a preset eighth threshold (e.g., the state of charge is less than 90%), (2) the traction battery 120 is fault-free, (3) the bidirectional DC/DC module 130 is in a standby state, (4) the auxiliary battery 110 is full or the state of charge is greater than a preset seventh threshold (e.g., the state of charge is greater than 90%), (5) the vehicle is powered normally, (6) the vehicle-mounted charger is in a normal state, and then the first controller 111 sends charging instructions such as charging voltage and charging current to the third controller 131 according to preset charging control logic. The third controller 131 controls the bidirectional DC/DC module 130 to receive the electric energy of the vehicle-mounted charger transmitted by the first external terminal 140 after receiving the charging command, and the bidirectional DC/DC module adjusts the electric energy (adjusts the charging voltage and the charging current) according to the charging command and charges the traction battery 120. The traction battery 120 is fully charged or the state of charge is greater than a preset ninth threshold (e.g., the state of charge > 95%), and the second controller 121 controls the normally open switch K2 to be opened.
4. Traction battery 120 discharges:
the second controller 121 monitors the state of charge of the traction battery 120 and sends the state of charge of the traction battery 120 to the first controller 111.
The first controller 111 monitors the state of charge of the auxiliary battery 110, and also obtains the operating state of the bidirectional DC/DC module 130 through an internal network, and obtains the vehicle power receiving state and the vehicle-mounted charger state through communication with the whole vehicle.
If the following conditions are simultaneously satisfied: (1) Vehicle power failure (network voltage is 0), (2) traction battery 120 has no failure, first controller 111 controls normally open switch K2 to close, and traction battery 120 supplies power to the traction dc bus.
When the traction battery 120 is in a discharging state and the state of charge of the traction battery 120 is smaller than a preset third threshold (for example, the state of charge is less than 20%), and the state of charge of the auxiliary battery 110 is larger than a preset fourth threshold (for example, the state of charge is greater than 50%), the first controller 111 sends a second discharging instruction to the third controller 131, and the third controller 131 controls the bidirectional DC/DC module 130 to operate according to the second discharging instruction, so that the auxiliary battery 110 discharges to the traction battery 120.
When the traction battery 120 fails or the state of charge is lower than a preset sixth threshold (e.g., the state of charge is less than 5%), the second controller 121 controls the normally open switch K2 to be opened, thereby protecting the traction battery 120.
The invention also provides a rail vehicle comprising: the power supply system of the above embodiment.
From the above description of the embodiments, it will be apparent to those skilled in the art that the embodiments may be implemented by means of software plus necessary general hardware platforms, or of course may be implemented by means of hardware. Based on this understanding, the foregoing technical solution may be embodied essentially or in a part contributing to the prior art in the form of a software product, which may be stored in a computer readable storage medium, such as ROM/RAM, a magnetic disk, an optical disk, etc., including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method described in the respective embodiments or some parts of the embodiments.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. A two-way output battery, comprising: the system comprises an auxiliary battery, a traction battery, a bidirectional DC/DC module, a normally closed switch, a normally open switch, a first external terminal, a second external terminal and a controller;
the auxiliary battery is connected with the bidirectional DC/DC module and the first external terminal through a normally closed switch, the traction battery is connected with the bidirectional DC/DC module and the second external terminal through a normally open switch, and the first external terminal is used for being connected with an auxiliary load output end of the vehicle-mounted charger;
the controller is used for monitoring the state of the auxiliary battery and the state of the traction battery, acquiring the state of the vehicle-mounted charger and the power receiving state of the vehicle, sending a discharging instruction to the bidirectional DC/DC module to work and controlling the normally open switch to be closed based on the state of the auxiliary battery, the state of the traction battery, the state of the vehicle-mounted charger and the power receiving state of the vehicle, and controlling the traction battery to discharge to the auxiliary battery or the auxiliary battery to discharge to the traction battery according to the discharging instruction.
2. The dual output battery of claim 1, wherein the controller comprises: the first controller, the second controller and the third controller are in communication connection;
The second controller is used for monitoring the state of the traction battery and sending the state of the traction battery to the first controller;
the first controller is used for monitoring the state of the auxiliary battery and acquiring the state of the vehicle-mounted charger and the power receiving state of the vehicle;
the first controller is further used for sending a discharging instruction to the third controller based on the state of the auxiliary battery, the state of the traction battery, the state of the vehicle-mounted charger and the power receiving state of the vehicle, and controlling the normally open switch to be closed, and the third controller is used for controlling the bidirectional DC/DC module to work according to the discharging instruction so as to enable the traction battery to discharge to the auxiliary battery or enable the auxiliary battery to discharge to the traction battery.
3. The two-way output storage battery according to claim 2, wherein the first controller is specifically configured to send a first discharging instruction to the third controller and control the normally open switch to be closed when the vehicle-mounted charger state is an output interrupt, the auxiliary battery is in a discharging state, the state of charge of the auxiliary battery is smaller than a first threshold, and the state of charge of the traction battery is larger than a second threshold, and the third controller is configured to control the two-way DC/DC module to operate according to the first discharging instruction, so that the traction battery discharges to the auxiliary battery;
The first controller is further specifically configured to control the normally open switch to be closed when the vehicle power receiving state is a fault, so that the traction battery enters a discharging state, and send a second discharging instruction to the third controller when the state of charge of the traction battery is smaller than a third threshold and the state of charge of the auxiliary battery is larger than a fourth threshold, where the third controller is configured to control the bidirectional DC/DC module to operate according to the second discharging instruction, so that the auxiliary battery discharges to the traction battery;
the first threshold and the third threshold are both less than the second threshold and the fourth threshold.
4. The two-way output battery of claim 3, wherein the first controller is further configured to control the normally closed switch to open in a case where the auxiliary battery is in a discharged state and a state of charge of the auxiliary battery is less than a fifth threshold, the fifth threshold being less than the first threshold, or in a case where the state of the auxiliary battery is faulty.
5. The two-way output battery of claim 3, wherein the second controller is further configured to control the normally open switch to open in a case where the traction battery is in a discharged state and a state of charge of the traction battery is less than a sixth threshold, the sixth threshold being less than the third threshold, or in a case where the state of the traction battery is faulty.
6. The dual output battery of claim 3, wherein the first threshold is 20% to 25%, the second threshold is 48% to 52%, the third threshold is 20% to 25%, and the fourth threshold is 48% to 52%.
7. The dual output battery of any one of claims 2-6, wherein the first controller is further configured to send a charging command to the vehicle-mounted charger to charge the auxiliary battery if the vehicle-mounted charger state and the vehicle power receiving state are both normal and the state of charge of the auxiliary battery is less than a seventh threshold.
8. The dual-output storage battery according to any one of claims 2 to 6, wherein the first controller is further configured to control the normally open switch to be closed and send a charging instruction to the third controller when the state of charge of the vehicle-mounted charger and the state of charge of the vehicle are normal, the state of charge of the auxiliary battery is greater than or equal to a seventh threshold, and the state of charge of the traction battery is less than an eighth threshold, the third controller receives the charging instruction and then controls the bidirectional DC/DC module to receive the power of the vehicle-mounted charger transmitted by the first external terminal, the bidirectional DC/DC module adjusts the power according to the charging instruction and then charges the traction battery, and the second controller controls the normally open switch to be opened when the state of charge of the traction battery is greater than the ninth threshold, and the ninth threshold is greater than the eighth threshold.
9. A power supply system, comprising: the auxiliary load direct current bus, traction direct current bus, N transfer switches, N vehicle-mounted chargers and N double-circuit output storage batteries according to any one of claims 1-8, wherein an ith power supply system is formed by the ith double-circuit output storage battery and the ith vehicle-mounted chargers, a first external terminal of the ith double-circuit output storage battery and an auxiliary load output end of the ith vehicle-mounted charger are both connected with the auxiliary load direct current bus, a second external terminal of the ith double-circuit output storage battery is connected with the traction direct current bus through the ith transfer switch, and the ith transfer switch is closed when a trigger signal that the power receiving state of a vehicle sent by a cab is a fault is received, wherein N is more than or equal to 1, i=1, 2, … and N.
10. A rail vehicle, comprising: the power supply system of claim 9.
CN202310368860.XA 2023-04-07 2023-04-07 Dual-output storage battery, power supply system and railway vehicle Pending CN116545085A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN118163887A (en) * 2024-05-07 2024-06-11 浙江春风动力股份有限公司 Motorcycle and control method of emergency battery thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN118163887A (en) * 2024-05-07 2024-06-11 浙江春风动力股份有限公司 Motorcycle and control method of emergency battery thereof

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