Battery system of electric rail locomotive

Abstract

The utility model relates to an electric rail locomotive battery system, which is characterized in that an auxiliary battery system and a power battery system are respectively arranged in a carriage and a dragging carriage, and an electrical cabinet is used for transmitting voltage output by each battery cluster in the power battery system to a confluence cabinet; and the confluence cabinet transmits the voltage output by each battery cluster in the auxiliary battery system to the auxiliary load system for power supply, and transmits the voltage output by each battery cluster in the power battery system or the voltage output by each battery cluster in the auxiliary battery system to the driving load system for power supply. The power battery system or the auxiliary battery system can be used for supplying power to the driving load system according to actual use scene requirements, the endurance mileage of the vehicle is guaranteed, and the power supply reliability is improved.

Description

Technical Field

[0001] This application relates to the technical field of power supply equipment, and particularly to a battery system for an electric rail locomotive. Background Art

[0002] With the rapid development of the new energy industry, the field of rail locomotives has also started an electrification reform, and traditional fuel systems have been switched to lithium battery power systems one after another. Since these rail vehicles are mainly used for transportation operations, there are certain requirements for load capacity and endurance. In order to ensure that these vehicles can still meet the above requirements after replacing the power system, all available spaces will be utilized as much as possible to arrange batteries during the vehicle transformation. The current transformation method for rail locomotives is to remove the fuel engine in the power cabin and use this space to arrange the battery system, which is not sufficient to ensure the endurance mileage of the vehicle and has the disadvantage of low power supply reliability. Summary of the Utility Model

[0003] Based on this, in view of the above problems, it is necessary to provide a battery system for an electric rail locomotive that can improve power supply reliability.

[0004] A battery system for an electric rail locomotive includes:

[0005] An auxiliary battery system, which is arranged in the carriage of the electric rail locomotive and includes a plurality of battery clusters connected in parallel;

[0006] A power battery system, which is arranged in the trailer of the electric rail locomotive and includes a plurality of battery clusters connected in parallel;

[0007] An electrical cabinet, which is connected to each battery cluster in the power battery system; the electrical cabinet transmits the voltage output by each battery cluster in the power battery system to a busbar cabinet;

[0008] The busbar cabinet is connected to the electrical cabinet, the auxiliary load system of the electric rail locomotive, the drive load system of the electric rail locomotive, and each battery cluster in the auxiliary battery system; the busbar cabinet transmits the voltage output by each battery cluster in the auxiliary battery system to the auxiliary load system for power supply, and transmits the voltage output by each battery cluster in the power battery system, or the voltage output by each battery cluster in the auxiliary battery system, to the drive load system for power supply.

[0009] The above-mentioned electric rail locomotive battery system sets up an auxiliary battery system and a power battery system in the carriage and the trailer respectively. The electrical cabinet is used to transmit the voltage output by each battery cluster in the power battery system to the busbar cabinet. The busbar cabinet transmits the voltage output by each battery cluster in the auxiliary battery system to the auxiliary load system for power supply, and transmits the voltage output by each battery cluster in the power battery system, or the voltage output by each battery cluster in the auxiliary battery system to the drive load system for power supply. The power battery system or the auxiliary battery system can be used to supply power to the drive load system according to the actual usage scenario requirements, ensuring the vehicle's cruising range and improving the power supply reliability. Brief Description of the Drawings

[0010] Figure 1 It is a structural block diagram of the electric rail locomotive battery system in an embodiment;

[0011] Figure 2 It is a structural schematic diagram of the electric rail locomotive battery system in an embodiment;

[0012] Figure 3 It is a structural schematic diagram of each battery cluster in the auxiliary battery system in an embodiment;

[0013] Figure 4 It is a structural schematic diagram of the electric rail locomotive battery system in another embodiment;

[0014] Figure 5 It is a structural schematic diagram of the circuit breakers in the electrical cabinet and the busbar cabinet in an embodiment. Detailed Description of the Embodiment

[0015] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0016] Currently, many rail vehicle companies still transform based on existing fuel vehicle models. The main method is to remove the fuel engine in the power compartment and use this space to arrange the battery system. Due to the limited space, the battery capacity of the battery system is generally not high enough to ensure the vehicle's cruising range. Therefore, many modified vehicles can only perform short-distance traction within the station. To solve this problem, the battery trailer can be added at the rear end of the vehicle to ensure the vehicle's cruising ability. Since the layout positions and capacities of the two battery systems are different, if the two battery systems are selected to be used in parallel, this method requires the vehicle and the trailer to be tied together for use. Once a problem occurs in a certain system during the later operation of the vehicle, the entire vehicle will not be able to move; if the two systems are used separately, there will be a series of control switching problems. How to reasonably allocate the use of these two power sources is a technical problem that needs to be explored by those skilled in the art.

[0017] Based on this, for the battery system of the electric rail locomotive provided in this application, by separately arranging an auxiliary battery system and a power battery system in the carriage and the trailer, the electrical cabinet is used to deliver the voltages output by each battery cluster in the power battery system to the busbar cabinet. The busbar cabinet delivers the voltages output by each battery cluster in the auxiliary battery system to the auxiliary load system for power supply, and delivers the voltages output by each battery cluster in the power battery system, or the voltages output by each battery cluster in the auxiliary battery system, to the drive load system for power supply. It is possible to use the power battery system or the auxiliary battery system to supply power to the drive load system according to the actual usage scenario requirements, ensuring the vehicle's cruising range and improving the power supply reliability.

[0018] In one embodiment, as Figure 1 shown, an electric rail locomotive battery system is provided, which includes an auxiliary battery system 100, a power battery system 200, an electrical cabinet 300, and a busbar cabinet 400. The auxiliary battery system 100 is arranged in the carriage of the electric rail locomotive and includes a plurality of parallel-connected battery clusters. The power battery system 200 is arranged in the trailer of the electric rail locomotive and includes a plurality of parallel-connected battery clusters. The electrical cabinet 300 is connected to each battery cluster in the power battery system 200 and is used to deliver the voltages output by each battery cluster in the power battery system 200 to the busbar cabinet 400; the busbar cabinet 400 is connected to the electrical cabinet 300, the auxiliary load system of the electric rail locomotive, the drive load system of the electric rail locomotive, and each battery cluster in the auxiliary battery system 100; the busbar cabinet 400 is used to deliver the voltages output by each battery cluster in the auxiliary battery system 100 to the auxiliary load system for power supply, and deliver the voltages output by each battery cluster in the power battery system 200, or the voltages output by each battery cluster in the auxiliary battery system 100, to the drive load system for power supply. Among them, the number of battery clusters in the auxiliary battery system 100 and the power battery system 200 is not unique and can be set according to actual needs. The electrical cabinet 300 can be arranged in the trailer or other places, and the busbar cabinet 400 can be arranged in the carriage or other places.

[0019] Furthermore, the battery system of the electric rail locomotive may further include a control module 500. The control module 500 is connected to the electrical cabinet 300 and the busbar cabinet 400, and conducts data communication with the busbar cabinet 400 and the electrical cabinet 300. For example, it detects battery information such as the current, voltage, and temperature of each battery cluster in the auxiliary battery system 100 and the power battery system 200. The control module 500 can also perform power supply control on the auxiliary battery system 100 and the power battery system 200 through the busbar cabinet 400 and the electrical cabinet 300 according to the collected battery information. The control module 500 can adopt an on-vehicle controller, such as a PLC (Programmable Logic Controller), etc., or the control module 500 can also be a separate controller.

[0020] The load system of the electric rail locomotive is mainly divided into an auxiliary load system and a driving load system. The driving load system mainly includes driving motors, and the auxiliary load system includes some auxiliary devices on the vehicle, such as air compressors, air conditioners, ventilation equipment, monitoring equipment, lighting, three-phase equipment, etc. The cumulative power of these load devices is relatively high, and the power of the auxiliary battery on the vehicle itself is limited and insufficient to support these electrical equipment to run for a long time. Therefore, by separately installing the auxiliary battery system 100 and the power battery system 200 in the carriage and trailer of the electric rail locomotive, the two battery systems are aggregated together through power cables to supply power to the load system. The functions of the two battery systems are as follows: 1. The power battery system 200 is mainly used to provide power output. For example, during long-distance operation, the power of the entire vehicle only comes from this system, while the auxiliary power system 100 is only used to supply power to auxiliary devices. The two battery systems supply power independently and do not interfere with each other; 2. When towing for short distances and with low loads, only the auxiliary battery system 100 can be selected. At this time, there is only one power supply for the entire vehicle, and the auxiliary battery system 100 supplies power to both the driving auxiliary and auxiliary loads at the same time. The power battery system 200 or the auxiliary battery system 100 can be used to supply power to the driving load system according to the actual usage scenario requirements, and the busbar cabinet 400 and the electrical cabinet 300 are controlled by the control module 500 to perform corresponding power supply control on the auxiliary battery system 100 and the power battery system 200 respectively, so as to achieve the management and control function, which can be applied to multiple scenarios. Whether it is short-distance towing or long-distance operation, the role of the battery can be fully exerted.

[0021] Specifically, each battery cluster in the auxiliary battery system 100 includes an auxiliary high-voltage box and several auxiliary battery boxes. After the auxiliary battery boxes are connected in series, they are connected to the auxiliary high-voltage box, and the auxiliary high-voltage box is connected to the busbar cabinet 400. Each auxiliary battery box is provided with battery cells and a slave control unit (BCU) for monitoring the voltage and temperature of the battery cells. Each battery cluster in the power battery system 200 includes a power high-voltage box, a DC / DC (direct current / direct current) module, and several power battery boxes. After the power battery boxes are connected in series, they are connected to the power high-voltage box, and the power high-voltage box is connected to the electrical cabinet 300 through the DC / DC module. Each power battery box is also provided with battery cells and a slave control unit (BCU) for monitoring the voltage and temperature of the battery cells. The DC / DC module is used to adjust the voltage of the battery cluster to make the voltages output by each battery cluster consistent. As Figure 2 shown, the auxiliary battery system 100 includes battery cluster-1, battery cluster-2, …, battery cluster-N. After the battery boxes in each battery cluster are connected in series, they are connected to the busbar cabinet 400 through the corresponding high-voltage box. The power battery system 200 includes battery cluster-1, battery cluster-2, …, battery cluster-N. After the battery boxes in each battery cluster are connected in series, they are connected to the electrical cabinet 300 through the corresponding high-voltage box and DC / DC module. In addition, the electric rail locomotive battery system further includes an inverter 600. The busbar cabinet 400 is connected to the drive load system through the inverter 600; the control module 500 is connected to the inverter 600 to control the inverter 600 to convert the direct current output by the busbar cabinet 400 into alternating current and output it to the drive load system.

[0022] Furthermore, each battery cluster in the auxiliary battery system 100 further includes an auxiliary thermal management unit and an auxiliary fire protection host; the auxiliary thermal management unit is used to maintain the battery cells in each auxiliary battery box operating within a set temperature range, and the auxiliary fire protection host is used to, when a fire occurs in an auxiliary battery box, pump the fire extinguishing medium into the corresponding auxiliary battery box to control the fire through the fire extinguishing medium. Each battery cluster in the power battery system 200 further includes a power thermal management unit and a power fire protection host; the power thermal management unit is used to maintain the battery cells in each power battery box operating within a set temperature range, and the power fire protection host is used to, when a fire occurs in a power battery box, pump the fire extinguishing medium into the corresponding power battery box to control the fire through the fire extinguishing medium.

[0023] The auxiliary battery system 100 arranged in the carriage is formed by connecting several battery clusters in parallel, and a single battery cluster is formed by connecting several auxiliary battery boxes in series. In addition, as Figure 3As shown, an auxiliary high-voltage box, an auxiliary thermal management unit, and an auxiliary fire-fighting main unit are also arranged in each battery cluster. The auxiliary fire-fighting main unit can adopt a water-cooled unit and is arranged at the topmost layer. Its main function is to provide thermal management for the battery boxes within a single cluster, ensuring that the battery cells in the battery boxes operate within a reasonable temperature range. The auxiliary high-voltage box is located in the second layer from the bottom. Various relays, fuses, resistors, and a battery management system (BMS) are arranged inside it. Its main function is to control the current output or input of a single cluster. In addition, it monitors the voltage, temperature of each battery cell in this cluster, and the magnitude of the charge and discharge current of the entire cluster. The auxiliary fire-fighting main unit is arranged at the bottommost layer. Fire extinguishing medium and pumps are designed inside it. When a fire occurs in the battery boxes within the battery cluster, the fire-fighting main unit transports the fire extinguishing medium into the battery box through the pump, and controls the fire through the fire extinguishing medium, thus realizing the fire-fighting function. A number of battery clusters within the auxiliary battery system 100 are connected in series and then incorporated into the busbar cabinet 400 in the carriage. A number of isolating switch circuit breakers, miniature circuit breakers and other execution units are arranged in the busbar cabinet 400. In addition, a three-level master control system (BMCU) is also arranged. This master control system is the upper control unit of the secondary battery management system (BMS) in the auxiliary high-voltage box within each battery cluster. The voltage output from the busbar cabinet 400 is input into the frequency converter 600. The frequency converter 600 converts direct current into alternating current, thereby driving the load motor to rotate.

[0024] The power battery system 200 arranged in the trailer has a layout similar to that of the carriage, and the layout within the battery cluster is also similar to that of the carriage. The difference is that there are more battery clusters in the trailer. To avoid the entire battery system from malfunctioning due to problems in a single cluster, a DC / DC module is added at the output end of the power high-voltage box of each cluster. The main function of this DC / DC module is to adjust the battery cluster voltage, so that the voltage output from each cluster can be kept consistent, thereby reducing the pressure difference between clusters and the circulating current between clusters. In addition, the DC / DC module can also control the charge and discharge current of the cluster according to the power of a single cluster, realizing one-cluster-one-management, relaxing the tolerance of differences between clusters within the system, and thus greatly improving the usage efficiency of the entire system. The current output after passing through the DC / DC module converges into the electrical cabinet 300. The layout inside the electrical cabinet 300 is similar to that of the busbar cabinet 400. The voltage output from the electrical cabinet 300 is incorporated into the busbar cabinet 400. By controlling the isolating switch in the busbar cabinet 400, it is possible to select which battery system is connected to the power supply circuit for driving the load system.

[0025] In one embodiment, as Figure 4 and Figure 5As shown, the busbar cabinet 400 includes a circuit breaker QS1, a circuit breaker QS2, a circuit breaker QS4, and a master control system BMCU-1 (not shown), and the electrical cabinet 300 includes a circuit breaker QS3 and a master control system BMCU-2 (not shown). Each battery cluster in the auxiliary battery system 100 is connected to the first end of the circuit breaker QS1 and the auxiliary load system, the second end of the circuit breaker QS1 is connected to the first end of the circuit breaker QS4, each battery cluster in the power battery system 200 is connected to the first end of the circuit breaker QS3, the second end of the circuit breaker QS3 is connected to the first end of the circuit breaker QS2, the second end of the circuit breaker QS2 is connected to the first end of the circuit breaker QS4, and the second end of the circuit breaker QS4 is connected to the drive load system, specifically, it can be connected to the drive load system through a frequency converter 600; the master control system BMCU-1 is connected to the control ends of the circuit breaker QS1, the circuit breaker QS2, and the circuit breaker QS4, and the master control system BMCU-2 is connected to the control end of the circuit breaker QS3; the control module 500 is connected to the master control system BMCU-1 and the master control system BMCU-2 for communication, controls the opening and closing of the circuit breaker QS1, the circuit breaker QS2, the circuit breaker QS4, and the circuit breaker QS3, and performs power supply process control on the auxiliary battery system 100 and the power battery system 200.

[0026] Among them, each circuit breaker can be an isolating switch circuit breaker, a miniature circuit breaker, etc. The first end of the circuit breaker QS1 is specifically connected to the auxiliary high-voltage box in each battery cluster of the auxiliary battery system 100, and the first end of the circuit breaker QS3 is specifically connected to the DC / DC module in each battery cluster of the power battery system 200. In addition, the master control system BMCU-2 can also be connected to the circuit breakers in the busbar cabinet 400 for opening and closing control, or the master control system BMCU-2 controls the opening and closing of the circuit breakers in the busbar cabinet 400 by communicating with the master control system BMCU-1.

[0027] In one embodiment, in the auxiliary battery system 100, the auxiliary battery boxes of each battery cluster include auxiliary battery cells and auxiliary slave control units, and the auxiliary high-voltage boxes of each battery cluster include an auxiliary battery management system; the auxiliary slave control units monitor the voltage and temperature of the auxiliary battery cells, generate acquisition signals and feedback them to the auxiliary battery management system of the battery cluster where they are located, and the auxiliary battery management systems of each battery cluster are connected to the master control system BMCU-1, and report the battery information within the cluster to the master control system BMCU-1 according to the received acquisition signals. In the power battery system 200, the power battery boxes of each battery cluster include power battery cells and power slave control units, and the power high-voltage boxes of each battery cluster include a power battery management system; the power slave control units monitor the voltage and temperature of the power battery cells, generate acquisition signals and feedback them to the power battery management system of the battery cluster where they are located, and the power battery management systems of each battery cluster are connected to the master control system BMCU-2, and report the battery information within the cluster to the master control system BMCU-2 according to the received acquisition signals; the DC / DC modules of each battery cluster are connected to the master control system BMCU-2, and control the charging and discharging current magnitude of the battery cluster where they are located according to the battery information of the battery cluster collected by the master control system BMCU-2.

[0028] Figure 4 is the layout diagram of each control unit within the entire battery system. The auxiliary battery system 100 and the power battery system 200 are respectively controlled by the master control system BMCU-1 in the busbar cabinet 400 and the master control system BMCU-2 in the electrical cabinet 300, and the frequency converter 600 is controlled by the vehicle controller PLC. In addition, slave control units BCU are arranged in each battery box, and their main function is to monitor the voltage and temperature of the battery cells, and feedback the collected signals to the battery management system BMS of the cluster, and the battery management system BMS then reports the battery information within the cluster to the three-level master control system BMCU. The DC / DC module within a single cluster of the power battery system 200 also communicates with the master control system BMCU-2. After the master control system BMCU-2 collects the battery information of each cluster, the DC / DC module actively obtains the battery information of the cluster, and then controls the charging and discharging current magnitude of the cluster.

[0029] From Figure 5 It can be seen that the output within the electrical cabinet 300 is controlled by the circuit breaker QS3, and the output current converges to the input denominator busbar in the busbar cabinet 400 through the power connection cable, and then flows into the main busbar through the circuit breaker QS2, while the output of the auxiliary battery system 100 flows into the main busbar through the circuit breaker QS1. The current on the main busbar then flows into the output busbar through the circuit breaker QS4, thereby outputting the voltage of the battery system to the drive load system. The auxiliary load system is directly connected to the front end of the circuit breaker QS1, and as long as the auxiliary battery system 100 has an output, the auxiliary load system can work properly.

[0030] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as falling within the scope described in this specification.

[0031] The above-described embodiments merely represent several implementation manners of the present application. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the utility model patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

Claims

1. An electric rail locomotive battery system, characterized in that: include: An auxiliary battery system, which is installed in the carriage of an electric rail locomotive, includes a number of battery clusters connected in parallel; The power battery system is installed in the trailer of the electric rail locomotive and includes a number of battery clusters connected in parallel; An electrical cabinet, connected to each battery cluster in the power battery system; the electrical cabinet transmits the voltage output by each battery cluster in the power battery system to the combiner cabinet; A junction box connects the electrical cabinet, the auxiliary load system of the electric rail locomotive, the driving load system of the electric rail locomotive and the battery clusters in the auxiliary battery system; the junction box transmits the voltage output by each battery cluster in the auxiliary battery system to the auxiliary load system for power supply, and transmits the voltage output by each battery cluster in the power battery system or the voltage output by each battery cluster in the auxiliary battery system to the driving load system for power supply.

2. The electric rail vehicle battery system according to claim 1, characterized in that: Each battery cluster in the auxiliary battery system includes an auxiliary high-voltage box and a plurality of auxiliary battery boxes. Each of the auxiliary battery boxes is connected in series to the auxiliary high-voltage box, and the auxiliary high-voltage box is connected to the combiner cabinet.

3. The electric rail vehicle battery system according to claim 2, characterized in that: Each battery cluster in the auxiliary battery system also includes an auxiliary thermal management unit and an auxiliary fire-fighting host; the auxiliary thermal management unit is used to maintain the battery cells in each auxiliary battery box operating within a set temperature range, and the auxiliary fire-fighting host is used to transfer the fire-extinguishing medium to the corresponding auxiliary battery box through a pump when a fire occurs in the auxiliary battery box, so as to control the fire through the fire-extinguishing medium.

4. The electric rail vehicle battery system according to claim 2, characterized in that: Each battery cluster in the power battery system includes a power high-voltage box, a DC / DC module and a plurality of power battery boxes. Each of the power battery boxes is connected in series to the power high-voltage box, and the power high-voltage box is connected to the electrical cabinet through the DC / DC module; the DC / DC module is used to adjust the voltage of the battery cluster so that the output voltage of each battery cluster remains consistent.

5. The electric rail vehicle battery system according to claim 4, characterized in that: Each battery cluster in the power battery system also includes a power thermal management unit and a power fire fighting host; the power thermal management unit is used to maintain the battery cells in each power battery box to operate within a set temperature range, and the power fire fighting host is used to transfer the fire extinguishing medium to the corresponding power battery box through a pump when a fire occurs in the power battery box, and control the fire through the fire extinguishing medium.

6. The electric rail vehicle battery system according to claim 4, characterized in that: The combiner cabinet includes circuit breaker QS1, circuit breaker QS2, circuit breaker QS4 and master control system BMCU-1, and the electrical cabinet includes circuit breaker QS3 and master control system BMCU-2; Each battery cluster in the auxiliary battery system is connected to the first end of the circuit breaker QS1 and the auxiliary load system, the second end of the circuit breaker QS1 is connected to the first end of the circuit breaker QS4, each battery cluster in the power battery system is connected to the first end of the circuit breaker QS3, the second end of the circuit breaker QS3 is connected to the first end of the circuit breaker QS2, the second end of the circuit breaker QS2 is connected to the first end of the circuit breaker QS4, and the second end of the circuit breaker QS4 is connected to the drive load system; the master control system BMCU-1 is connected to the control end of the circuit breaker QS1, the control end of the circuit breaker QS2 and the control end of the circuit breaker QS4, and the master control system BMCU-2 is connected to the control end of the circuit breaker QS3.

7. The electric rail vehicle battery system according to claim 6, characterized in that: In the auxiliary battery system, the auxiliary battery box of each battery cluster includes auxiliary battery cells and auxiliary slave control units, and the auxiliary high-voltage box of each battery cluster includes an auxiliary battery management system; the auxiliary slave control unit monitors the voltage and temperature of the auxiliary battery cells, generates an acquisition signal and feeds it back to the auxiliary battery management system of the battery cluster. The auxiliary battery management system of each battery cluster is connected to the master control system BMCU-1, and reports the battery information in the cluster to the master control system BMCU-1 according to the received acquisition signal.

8. The electric rail vehicle battery system according to claim 6, characterized in that: In the power battery system, the power battery box of each battery cluster includes power cells and power slave control units, and the power high-voltage box of each battery cluster includes a power battery management system; the power slave control unit monitors the voltage and temperature of the power cells, generates a collection signal and feeds it back to the power battery management system of the battery cluster, and the power battery management system of each battery cluster is connected to the master control system BMCU-2, and reports the battery information in the cluster to the master control system BMCU-2 according to the received collection signal; the DC / DC module of each battery cluster is connected to the master control system BMCU-2, and controls the charging and discharging current of the battery cluster according to the battery information of the battery cluster collected by the master control system BMCU-2.

9. The electric rail vehicle battery system according to any one of claims 1 to 8, characterized in that: It also includes a frequency converter, through which the combiner cabinet is connected to the drive load system; the frequency converter converts the direct current output by the combiner cabinet into alternating current and outputs it to the drive load system.

10. The electric rail vehicle battery system according to claim 9, characterized in that: It also includes a control module, which is connected to the electrical cabinet, the combiner cabinet and the frequency converter.

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