Balancing control method and system, storage medium, vehicle controller, train

Abstract

The present invention discloses a balancing control method and system, a storage medium, a vehicle controller, and a train, wherein the high-voltage input end of the DC-DC converter assembly in each carriage of the train is connected to the corresponding battery assembly, the low-voltage output end is connected to a low-voltage load, and they are connected in parallel through an extended power supply contactor. The balancing control method includes: obtaining the SOC value of the battery assembly in each carriage; determining the maximum SOC value and the minimum SOC value based on the SOC value of the battery assembly in each carriage, and determining the SOC difference between the two; controlling the DC-DC converter assembly and the corresponding extended power supply contactor in each carriage based on the SOC difference to achieve power balance by changing the power supply battery of the low-voltage load. As a result, the balancing control method can reduce the difference in battery power between the train carriages, avoid the situation where a single or multiple battery packs in the train discharge excessively, thereby affecting the normal operation of the train, and ensure that the train can travel safely while reducing power loss and saving energy.

Description

Technical Field

[0001] The present invention relates to the technical field of battery balancing control, and in particular to a method for balancing the battery power of a train carriage, a computer-readable storage medium, a vehicle controller, a balancing control system for the battery power of a train carriage, and a train. Background Art

[0002] At present, domestic urban rail trains use their own battery packs to provide power for vehicle traction and related high-voltage equipment. This power supply method will result in inconsistent battery pack power between different carriages after the vehicle has been running for a long time. As a result, the carriage with low battery pack power cannot provide sufficient power. Even if the power of other carriages is sufficient, they cannot continue to operate and the vehicle needs to return to the depot for charging.

[0003] In related technologies, the method used to balance the battery power in train compartments is to set up a balancing module, use battery packs with a power greater than the average power of the battery pack to charge the balancing module, and then control the balancing module to discharge batteries with a power less than the average power of the battery pack to achieve balance of the battery pack.

[0004] In the related art, a balancing module is provided to perform power conversion, which tends to consume more power. The balancing module tends to cause power waste during the charging and discharging process. Summary of the Invention

[0005] The present invention aims to at least partially address one of the technical problems in the related art. To this end, the first objective of the present invention is to provide a method for balancing the battery charge in train compartments. This method can reduce the difference in battery charge between train compartments, prevent excessive discharge of a single or multiple battery packs, and thus prevent the normal operation of the train from being affected. This method ensures safe operation of the train while reducing power loss and conserving energy.

[0006] A second object of the present invention is to provide a computer-readable storage medium.

[0007] The third object of the present invention is to provide a vehicle controller.

[0008] A fourth object of the present invention is to provide a battery power balancing control system for train carriages.

[0009] A fifth object of the present invention is to provide a train.

[0010] To achieve the above-mentioned objectives, an embodiment of the first aspect of the present invention proposes a method for balancing the battery power of a train car, wherein each car of the train includes a DC-DC (Direct Current-Direct Current) converter assembly and a battery assembly, the high-voltage input end of the DC-DC converter assembly in each car is connected to the corresponding battery assembly, and the low-voltage output end of the DC-DC converter assembly in each car is connected to a low-voltage load, and the batteries are connected in parallel through corresponding extended power supply contactors. The balancing control method includes: obtaining the SOC (State Of Charge) value of the battery assembly in each car; determining the maximum SOC value and the minimum SOC value based on the SOC value of the battery assembly in each car, and determining the SOC difference between the maximum SOC value and the minimum SOC value; and controlling the DC-DC converter assembly and the corresponding extended power supply contactor in each car based on the SOC difference to achieve power balancing of the battery assembly in each car through the low-voltage load.

[0011] In this embodiment, each train car includes a DC-DC converter assembly and a battery assembly. The high-voltage input terminal of the DC-DC converter assembly is connected to the battery assembly, and the low-voltage output terminal of the DC-DC converter assembly is connected to the low-voltage load. In addition, each DC-DC converter assembly is connected in parallel via a corresponding extended power supply contactor. The balancing control method in this embodiment includes the following steps: first, obtaining the SOC value of the battery assembly in each train car, then calculating the SOC difference between the maximum SOC value and the minimum SOC value, and then controlling the DC-DC converter assembly and the corresponding extended power supply contactor in each car based on the SOC difference to power the low-voltage load and thereby control the battery assembly in each car to achieve power balancing. As a result, the balancing control method in this embodiment can reduce the difference in battery power between each train car, avoid the situation where a single or multiple battery packs on the train are discharged too much, thereby affecting the normal operation of the train, and ensure the safe operation of the train while reducing power loss and saving energy.

[0012] To achieve the above-mentioned purpose, the second embodiment of the present invention proposes a computer-readable storage medium, on which a train car battery power balancing control program is stored. When the program is executed by a processor, the train car battery power balancing control method as described in the above embodiment is implemented.

[0013] The computer-readable storage medium of an embodiment of the present invention executes the train car battery power balancing control program stored thereon through a processor, thereby reducing the difference in battery power between each train car, avoiding the situation where a single or multiple battery packs on the train discharge excessively and affect the normal operation of the train, ensuring that the train can travel safely while reducing power loss and saving energy.

[0014] To achieve the above-mentioned purpose, an embodiment of the third aspect of the present invention proposes a whole vehicle controller, which includes a memory, a processor, and a train car battery power balancing control program stored in the memory and runnable on the processor. When the program is executed by the processor, the train car battery power balancing control method as described in the above embodiment is implemented.

[0015] The vehicle controller of an embodiment of the present invention includes a memory and a processor. The processor executes a train car battery power balancing control program stored in the memory, thereby reducing the difference in battery power between each train car, avoiding the situation where a single or multiple battery packs on the train discharge excessively and affect the normal operation of the train, ensuring that the train can travel safely while reducing power loss and saving energy.

[0016] To achieve the above objectives, a fourth embodiment of the present invention proposes a train car battery charge balancing control system, the control system comprising a battery manager, a DC-DC converter assembly, and a battery assembly arranged in each car of the train, wherein the high-voltage input end of the DC-DC converter assembly in each car is connected to the corresponding battery assembly, the low-voltage output end of the DC-DC converter assembly in each car is connected to a low-voltage load, and the two are connected in parallel through corresponding extended power supply contactors, the battery manager in each car is used to determine the SOC value of the corresponding battery assembly; the vehicle controller, The vehicle controller communicates with the battery manager and DC-DC converter assembly in each car respectively to obtain the SOC value of the battery assembly in each car, and determines the maximum SOC value and the minimum SOC value according to the SOC value of the battery assembly in each car, as well as determines the SOC difference between the maximum SOC value and the minimum SOC value, and controls the DC-DC converter assembly and the corresponding extended power supply contactor in each car according to the SOC difference, so as to achieve power balancing of the battery assembly in each car by operating the low-voltage load.

[0017] The balancing control system of this embodiment includes a battery manager, a DC-DC converter assembly, a battery assembly, and a vehicle controller. The battery manager, DC-DC converter assembly, and battery assembly are arranged in each carriage of the train. The high-voltage input end of the DC-DC converter assembly in each carriage is connected to the battery assembly, and the low-voltage output end of the DC-DC converter assembly is connected to the low-voltage load of the train. The DC-DC converter assemblies in each carriage are connected in parallel through corresponding extended power supply contactors. A battery manager installed in each car is used to determine the SOC value of the corresponding battery assembly. The vehicle controller communicates with the battery manager and DC-DC converter assembly in each car to obtain the SOC value of the battery assembly in each car. Based on the maximum and minimum SOC values ​​of the battery assembly in each car, the SOC difference between the maximum and minimum SOC values ​​is determined. Based on this SOC difference, the DC-DC converter assembly and the corresponding extended power supply contactor in each car are controlled to power the low-voltage load and thereby control the battery assembly in each car to achieve charge balance. As a result, the balancing control system in this embodiment can reduce the difference in battery charge between train cars, prevent the occurrence of excessive discharge of a single or multiple battery packs on the train, which could affect normal train operation, ensure safe train operation, reduce power loss, and save energy.

[0018] To achieve the above-mentioned objectives, a fifth embodiment of the present invention provides a train, which includes the train car battery power balancing control system described in the above-mentioned embodiment.

[0019] The train of the embodiment of the present invention can reduce the difference in battery power between the various train cars through the train car battery power balancing control system in the above embodiment, avoid excessive discharge of a single or multiple battery packs on the train, thereby affecting the normal operation of the train, ensuring the safe travel of the train while reducing power loss and saving energy.

[0020] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a block diagram of a power distribution structure of a train compartment according to one embodiment of the present invention;

[0022] Figure 2 is a flow chart of a method for controlling battery power balance in train compartments according to an embodiment of the present invention;

[0023] Figure 3 is a schematic diagram of a communication connection between a vehicle controller and a load according to an embodiment of the present invention;

[0024] Figure 4 is a flow chart of a method for controlling the equalization of battery power in train compartments according to a specific embodiment of the present invention;

[0025] Figure 5 is a structural block diagram of a vehicle controller according to an embodiment of the present invention;

[0026] Figure 6 This is a structural block diagram of a train compartment battery power balancing control system according to one embodiment of the present invention;

[0027] Figure 7 2 is a structural block diagram of a train according to an embodiment of the present invention. DETAILED DESCRIPTION

[0028] The following describes embodiments of the present invention in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and are not to be construed as limiting the present invention.

[0029] The following describes the balancing control method and system, storage medium, vehicle controller, and train according to embodiments of the present invention with reference to the accompanying drawings.

[0030] First, if Figure 1 As shown, the train in the embodiment of the present invention includes multiple carriages, and each carriage includes a DC-DC converter assembly 20 and a battery assembly 10. It can be understood that the power in the battery assembly 10 of each carriage can be distributed to each high-voltage load through the high-voltage distribution box assembly, wherein the input end of the DC-DC converter assembly 20 is the high-voltage end, and can be connected to the battery assembly 10 through the high-voltage distribution box assembly, so that the battery assembly 10 can supply power to the DC-DC converter assembly 20. It can be understood that the DC-DC converter assembly 20 can transform the high-voltage electricity connected to its input end and output low-voltage electricity. A low-voltage load 30 is connected to the low-voltage output end of the DC-DC converter assembly 20. The low-voltage load 30 can be a low-voltage powered device such as a car light or a display on the car. And, as Figure 1 As shown, the train in this embodiment also includes a set of through-wires, and the DC-DC converter assembly 20 can be connected to the through-wires through corresponding expandable power supply contactors 40, so that the DC-DC converter assembly 20 in each car can be connected in parallel.

[0031] Figure 2 The figure is a flow chart of a method for controlling the battery power balance of a train compartment according to an embodiment of the present invention.

[0032] like Figure 2As shown, the present invention proposes a method for balancing the battery power of a train compartment, and the balancing control method includes the following steps:

[0033] S10, obtaining the SOC value of the battery assembly in each carriage.

[0034] Specifically, see Figure 1 As shown, the loads in each car may include a maintenance switch assembly, a motor controller assembly, a DC-DC converter assembly, an air conditioning assembly, etc. Although the loads in each car are the same, the usage time of each load may be different, or other factors may cause the same load to consume different amounts of electricity, which can easily lead to different battery capacities in different cars. Of course, there are many other reasons that affect the battery power in each car, such as some cars have more or less loads, which can easily lead to differences in battery power between cars after a period of use. I will not list them all here.

[0035] In this embodiment, the SOC value of the battery assembly in each carriage can be obtained to obtain the remaining power of the corresponding carriage. It should be noted that the SOC value of each battery assembly in this embodiment can be obtained by the vehicle controller, such as Figure 3 As shown, the vehicle controller can communicate with the battery manager in each car through the network and communicate with the DC-DC converter assembly, and then obtain the battery power in each car through the battery manager, that is, the SOC value of each battery assembly.

[0036] S20 , determining a maximum SOC value and a minimum SOC value according to the SOC value of the battery assembly in each carriage, and determining an SOC difference between the maximum SOC value and the minimum SOC value.

[0037] Specifically, after obtaining the SOC value of the battery assembly in each car, multiple SOC values ​​that may be the same or different can be obtained from the multiple SOC values, and then the size of each SOC value can be judged to determine the maximum SOC value and the minimum SOC value among the multiple SOC values. Of course, the second largest SOC value, the second smallest SOC value, etc. can also be determined. It is understandable that the car battery corresponding to the maximum SOC value has the most remaining power, and the car battery corresponding to the minimum SOC value has the least remaining power. In the case where the maximum SOC value and the minimum SOC value differ greatly, balancing control can be performed. Of course, it is understandable that when the maximum SOC value and the minimum SOC value do not differ much, balancing control may not be performed.

[0038] In order to accurately control whether it is necessary to balance the battery power of each compartment, this embodiment calculates the SOC difference between the maximum SOC value and the minimum SOC value after obtaining the two, and then determines whether battery power balancing control is needed based on the size of the SOC difference.

[0039] S30: Control the DC-DC converter assembly and the corresponding extended power supply contactor in each car according to the SOC difference, so as to achieve power balancing of the battery assembly in each car by operating the low-voltage load.

[0040] Specifically, after calculating the maximum SOC value and the minimum SOC value, it can be determined whether to perform balanced control of the battery charge in each compartment. More specifically, the extended power supply contactors corresponding to the maximum SOC value and the minimum SOC value can be controlled to achieve balanced charge in each battery by having the low-voltage load powered by different batteries. In other words, the battery assembly corresponding to the maximum SOC value can be used to power the low-voltage load corresponding to the minimum SOC value, so that the battery assembly corresponding to the maximum SOC value consumes charge faster, while the battery assembly corresponding to the minimum SOC value consumes charge slower, thereby achieving balanced charge between the battery assemblies.

[0041] In this embodiment, in step S30, the DC-DC converter assembly and the corresponding extended power supply contactor in each car are controlled according to the SOC difference, including: when the SOC difference is greater than or equal to a first preset threshold and less than or equal to a second preset threshold, controlling the extended power supply contactors corresponding to the car with the maximum SOC value and the car with the minimum SOC value to close, and sending a high-voltage power-on instruction to the DC-DC converter assembly in the car with the maximum SOC value, and sending a high-voltage power-off instruction to the DC-DC converter assembly in the car with the minimum SOC value.

[0042] Specifically, in order to more accurately balance the charge levels of the battery assemblies in each compartment, a first preset threshold and a second preset threshold are set in this embodiment. After the SOC difference is obtained, the SOC difference can be compared with the first preset threshold and the second preset threshold. If the SOC difference is greater than the first preset threshold and less than the second preset threshold, it indicates that the maximum SOC value and the minimum SOC value need to be balanced. In addition, the balancing control controls the battery assembly corresponding to the maximum SOC value to supply power to the low-voltage load corresponding to the minimum SOC value. More specifically, if the SOC difference is greater than or equal to the first preset threshold and less than or equal to the second preset threshold, the extended power supply contactors of the compartments corresponding to the maximum SOC value and the minimum SOC value are controlled to close, and the vehicle controller can send a high-voltage power-on command to the DC-DC converter assembly in the compartment corresponding to the maximum SOC value, and send a high-voltage power-off command to the DC-DC converter assembly in the compartment corresponding to the minimum SOC value.

[0043] like Figure 2 As shown, assuming that the first car corresponds to the car with the maximum SOC value and the second car corresponds to the car with the minimum SOC value, then when the SOC difference is greater than or equal to the first preset threshold and less than or equal to the second preset threshold, the extended power supply contactors of the first car and the second car can be controlled to close, and a high-voltage power-on instruction is sent to the DC-DC converter assembly of the first car to control the DC-DC converter assembly of the first car to power on, and at the same time, a high-voltage power-off instruction is sent to the DC-DC converter assembly of the second car to control the DC-DC converter assembly of the second car to power off. In this example, the battery assembly corresponding to the first car can supply power to its own low-voltage load, and can also supply power to the low-voltage load of the second car through the through line, so that the battery assembly of the second car only needs to supply power to its high-voltage loads, without supplying power to the low-voltage loads, saving energy. The first car not only needs to supply power to the low-voltage loads of itself, but also needs to supply power to the low-voltage loads of the second car, increasing energy consumption, and thus the balance of the battery assemblies in the two cars can be controlled.

[0044] Optionally, in this embodiment, the first preset threshold is 5%, and the second preset threshold is 10%.

[0045] In this embodiment, in step S30, the DC-DC converter assembly and the corresponding extended power supply contactor in each car are controlled according to the SOC difference, and also includes: when the SOC difference is greater than a second preset threshold, controlling the extended power supply contactors corresponding to the car with the maximum SOC value, the car with the minimum SOC value and the car with the second smallest SOC value to close, and sending a high-voltage power-on instruction to the DC-DC converter assembly in the car with the maximum SOC value, and sending a high-voltage power-off instruction to the DC-DC converter assembly in the car with the minimum SOC value and the DC-DC converter assembly in the car with the second smallest SOC value.

[0046] Specifically, in order to be able to more accurately balance the power of the battery assemblies in each car, this embodiment compares the SOC difference with the second preset threshold after obtaining it. When the SOC difference is greater than the second preset threshold, the extended power supply contactors of the cars corresponding to the maximum SOC value, the minimum SOC value and the second smallest SOC value can be controlled to close, and then the vehicle controller can send a high-voltage power-on instruction to the DC-DC converter assembly in the car corresponding to the maximum SOC value, and send a high-voltage power-off instruction to the DC-DC converter assembly in the car corresponding to the minimum SOC value and the second smallest SOC value.

[0047] More specifically, in this embodiment, the battery assembly corresponding to the maximum SOC value not only needs to supply power to its own low-voltage load, but also can supply power to the low-voltage loads corresponding to the minimum SOC value and the second smallest SOC value, while the battery assembly corresponding to the minimum SOC value and the second smallest SOC value does not need to supply power to its own low-voltage load. This allows the battery power of each compartment to be balanced. It should be noted that because the SOC difference in this embodiment is greater than the second preset threshold, the battery assembly corresponding to the maximum SOC value can be controlled to simultaneously supply power to the low-voltage loads corresponding to the minimum SOC value and the second smallest SOC value, thereby improving the speed of battery power balancing in each compartment.

[0048] In some embodiments of the present invention, in step S30, the DC-DC converter assembly and the corresponding extended power supply contactor in each car are controlled according to the SOC difference, and the step also includes: when the SOC difference is less than a first preset threshold, controlling the corresponding extended power supply contactor of each car to disconnect, and sending a high-voltage power-on instruction to the DC-DC converter assembly in each car.

[0049] Specifically, in this embodiment, after obtaining the SOC difference, if the difference is less than the first preset threshold value, it means that the power difference between the batteries of each car is not large, and there is no need for balancing control. Therefore, the extended power supply contactor corresponding to each car can be controlled to disconnect, and a high-voltage power-on instruction is sent to the DC-DC converter assembly in each car, so that the battery assembly in each car can power its own low-voltage load without powering the low-voltage loads of other cars.

[0050] It can be understood that when the SOC difference is greater than the first preset threshold, the battery assembly of the current car can continue to obtain data from the battery assembly of each car while supplying power to the corresponding low-voltage loads in other cars, and when the difference between the maximum SOC value and the minimum SOC value is less than the first preset threshold, the DC-DC converter assembly in each car is controlled to be powered on, and the extended power supply contactor corresponding to each car is controlled to be disconnected, so that the battery assembly of each car can supply power to its own voltage load.

[0051] In one embodiment of the present invention, the DC-DC converter assembly in each carriage converts the first direct current provided by the corresponding battery assembly into a second direct current upon receiving a high-voltage power-on command to power a low-voltage load, wherein the voltage of the second direct current is lower than the voltage of the first direct current.

[0052] Specifically, after receiving the high-voltage power-on command, the DC-DC converter assembly in each carriage can convert the first DC power provided by the battery assembly into a second DC power and provide it to the low-voltage load to ensure that the low-voltage load can operate normally. It should be noted that the voltage of the second DC power in this embodiment is lower than the voltage of the first DC power.

[0053] Figure 4 FIG. 1 is a flow chart of a method for controlling the battery charge balance of a train compartment according to a specific embodiment of the present invention. Figure 4As shown, after receiving the SOC values ​​sent by the BMS (Battery Management System) of each car, the onboard controller CCU (Central Control Unit) determines that if the difference between the maximum and minimum SOC values ​​of each car is less than 5%, it sends a high-voltage power-on command to the DC-DC converter assembly of each car and disconnects the extended power supply contactor of each car. It then re-determines whether the difference in the onboard controller is greater than 5%. If the SOC difference is greater than 5%, it further determines whether the SOC difference is greater than 10%. If it is not greater than 10%, it controls the extended power supply contactor corresponding to the car with the largest SOC value to close, sends a high-voltage power-on command to the DC-DC converter assembly of the car with the largest SOC value, and simultaneously controls the extended power supply contactor corresponding to the car with the smallest SOC value to close, and sends a high-voltage power-off command to the DC-DC converter assembly of the car with the smallest SOC value. If the SOC difference is greater than 10%, the extended power supply contactor corresponding to the car with the largest SOC value is controlled to close, and a high-voltage power-on instruction is sent to the DC-DC converter assembly of the car with the maximum SOC value. At the same time, the extended power supply contactors corresponding to the cars with the smallest and second smallest SOC values ​​are controlled to close, and a high-voltage power-off instruction is sent to the DC-DC converter assembly of the cars with the smallest and second smallest SOC values.

[0054] In summary, the method for balancing the battery power of train carriages in an embodiment of the present invention can reduce the difference in battery power between the various carriages of the train, avoid excessive discharge of a single or multiple battery packs in the train, thereby affecting the normal operation of the train, and ensure that the train can travel safely while reducing power loss and saving energy.

[0055] Furthermore, the present invention proposes a computer-readable storage medium storing a train compartment battery power balancing control program, which, when executed by a processor, implements the train compartment battery power balancing control method as described in the above embodiment.

[0056] The computer-readable storage medium of an embodiment of the present invention executes the train car battery power balancing control program stored thereon through a processor, thereby reducing the difference in battery power between each train car, avoiding the situation where a single or multiple battery packs on the train discharge excessively and affect the normal operation of the train, ensuring that the train can travel safely while reducing power loss and saving energy.

[0057] Figure 5 4 is a structural block diagram of a vehicle controller according to an embodiment of the present invention.

[0058] Further, if Figure 5As shown, an embodiment of the present invention proposes a vehicle controller 100, which includes a memory 101, a processor 102, and a train car battery power balancing control program stored in the memory 101 and executable on the processor 102. When the program is executed by the processor, a train car battery power balancing control method as in the above embodiment is implemented.

[0059] The vehicle controller of an embodiment of the present invention includes a memory and a processor. The processor executes a train car battery power balancing control program stored in the memory, thereby reducing the difference in battery power between each train car, avoiding the situation where a single or multiple battery packs on the train discharge excessively and affect the normal operation of the train, ensuring that the train can travel safely while reducing power loss and saving energy.

[0060] Figure 6 The figure is a structural block diagram of a train compartment battery power balancing control system according to one embodiment of the present invention.

[0061] Furthermore, if Figure 6 As shown, the balancing control system of this embodiment includes a battery manager, a DC-DC converter assembly, a battery assembly, and a vehicle controller, which are arranged in each car of the train. The high-voltage input end of the DC-DC converter assembly in each car is connected to the corresponding battery assembly, and the low-voltage output end of the DC-DC converter assembly in each car is connected to a low-voltage load. The two are connected in parallel through corresponding extended power supply contactors. The battery manager in each car is used to determine the SOC value of the corresponding battery assembly. The vehicle controller communicates with the battery manager and DC-DC converter assembly in each car respectively to obtain the SOC value of the battery assembly in each car, and determines the maximum SOC value and the minimum SOC value based on the SOC value of the battery assembly in each car, as well as the SOC difference between the maximum SOC value and the minimum SOC value. The DC-DC converter assembly and the corresponding extended power supply contactor in each car are controlled according to the SOC difference to achieve power balancing of the battery assembly in each car through the operation of the low-voltage load.

[0062] Specifically, if Figure 6As shown, the train in the embodiment of the present invention includes multiple carriages, and each carriage includes a DC-DC converter assembly 20 and a battery assembly 10. It can be understood that the power in the battery assembly 10 of each carriage can be distributed to each high-voltage load through the high-voltage distribution box assembly, wherein the input end of the DC-DC converter assembly 20 is the high-voltage end, and can be connected to the battery assembly 10 through the high-voltage distribution box assembly, so that the battery assembly 10 can supply power to the DC-DC converter assembly 20. It can be understood that the DC-DC converter assembly 20 can transform the high-voltage electricity connected to its input end and output low-voltage electricity. A low-voltage load 30 is connected to the low-voltage output end of the DC-DC converter assembly 20. The low-voltage load 30 can be a low-voltage powered device such as a car light or a display on the car. And, as Figure 6 As shown, the train in this embodiment also includes a set of through-wires, and the DC-DC converter assembly 20 can be connected to the through-wires through corresponding expandable power supply contactors 40, so that the DC-DC converter assembly 20 in each car can be connected in parallel.

[0063] See also Figure 6 As shown, the loads in each car may include a maintenance switch assembly, a motor controller assembly, a DC-DC converter assembly, an air conditioning assembly, etc. Although the loads in each car are the same, the usage time of each load may be different, or other factors may cause the same load to consume different amounts of electricity, which can easily lead to different battery capacities in different cars. Of course, there are many other reasons that affect the battery power in each car, such as some cars have more or less loads, which can easily lead to differences in battery power between cars after a period of use. I will not list them all here.

[0064] In this embodiment, the SOC value of the battery assembly in each carriage can be obtained to obtain the remaining power of the corresponding carriage. It should be noted that the SOC value of each battery assembly in this embodiment can be obtained by the vehicle controller. Figure 6 Not shown in detail, please refer to Figure 3 The vehicle controller can communicate with the battery manager in each car through the network, and communicate with the DC-DC converter assembly, and then obtain the battery power in each car through the battery manager, that is, the SOC value of each battery assembly.

[0065] After the vehicle controller obtains the SOC value of the battery assembly in each car, it can obtain multiple SOC values ​​that can be the same or different from the multiple SOC values, and then judge the size of each SOC value to determine the maximum SOC value and the minimum SOC value among the multiple SOC values. Of course, the second largest SOC value, the second smallest SOC value, etc. can also be determined. It is understandable that the car battery corresponding to the maximum SOC value has the most remaining power, and the car battery corresponding to the minimum SOC value has the least remaining power. In the case where the maximum SOC value and the minimum SOC value differ greatly, balancing control can be performed. Of course, it is understandable that when the maximum SOC value and the minimum SOC value do not differ much, balancing control may not be performed.

[0066] In order to accurately control whether it is necessary to balance the battery power of each compartment, this embodiment calculates the SOC difference between the maximum SOC value and the minimum SOC value after obtaining the two, and then determines whether battery power balancing control is needed based on the size of the SOC difference.

[0067] Specifically, after calculating the maximum SOC value and the minimum SOC value, it can be determined whether to perform balanced control of the battery charge in each compartment. More specifically, the extended power supply contactors corresponding to the maximum SOC value and the minimum SOC value can be controlled to achieve balanced charge in each battery by having the low-voltage load powered by different batteries. In other words, the battery assembly corresponding to the maximum SOC value can be used to power the low-voltage load corresponding to the minimum SOC value, so that the battery assembly corresponding to the maximum SOC value consumes charge faster, while the battery assembly corresponding to the minimum SOC value consumes charge slower, thereby achieving balanced charge between the battery assemblies.

[0068] In some embodiments of the present invention, the vehicle controller is also used to control the closing of the extended power supply contactors corresponding to the car with the maximum SOC value and the car with the minimum SOC value when the SOC difference is greater than or equal to a first preset threshold and less than or equal to a second preset threshold, and to send a high-voltage power-on instruction to the DC-DC converter assembly in the car with the maximum SOC value, and to send a high-voltage power-off instruction to the DC-DC converter assembly in the car with the minimum SOC value.

[0069] In some embodiments of the present invention, the vehicle controller is also used to control the closure of the extended power supply contactors corresponding to the car with the maximum SOC value, the car with the minimum SOC value, and the car with the second smallest SOC value when the SOC difference is greater than a second preset threshold value, and to send a high-voltage power-on instruction to the DC-DC converter assembly in the car with the maximum SOC value, and to send a high-voltage power-off instruction to the DC-DC converter assembly in the car with the minimum SOC value and the DC-DC converter assembly in the car with the second smallest SOC value.

[0070] In some embodiments of the present invention, the vehicle controller is also used to control the extended power supply contactor corresponding to each car to disconnect when the SOC difference is less than a first preset threshold, and send a high-voltage power-on command to the DC-DC converter assembly in each car.

[0071] In some embodiments of the present invention, the DC-DC converter assembly in each carriage converts the first direct current provided by the corresponding battery assembly into a second direct current upon receiving a high-voltage power-on command to power a low-voltage load, wherein the voltage of the second direct current is lower than the voltage of the first direct current.

[0072] It should be noted that other specific implementations of the train compartment battery power balancing control system of the embodiment of the present invention can refer to the specific implementation of the train compartment battery power balancing control method in the above embodiment, which will not be repeated here.

[0073] In summary, the train car battery power balancing control system of the embodiment of the present invention can reduce the difference in battery power between the various train cars, avoid excessive discharge of a single or multiple battery packs on the train, thereby affecting the normal operation of the train, and ensure the safe travel of the train while reducing power loss and saving energy.

[0074] Figure 7 2 is a structural block diagram of a train according to an embodiment of the present invention.

[0075] Furthermore, if Figure 7 As shown, the present invention proposes a train 200, which includes the train compartment battery power balancing control system in the above embodiment.

[0076] The train of the embodiment of the present invention can reduce the difference in battery power between the various train cars through the train car battery power balancing control system in the above embodiment, avoid excessive discharge of a single or multiple battery packs on the train, thereby affecting the normal operation of the train, ensuring the safe travel of the train while reducing power loss and saving energy.

[0077] In addition, other structures and functions of the train according to the embodiment of the present invention are known to those skilled in the art and will not be described in detail here to reduce redundancy.

[0078] It should be noted that the logic and / or steps represented in the flowcharts or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing the logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (e.g., a computer-based system, a system including a processor, or other system that can fetch and execute instructions from an instruction execution system, apparatus, or device). For purposes of this specification, a "computer-readable medium" can be any device that can contain, store, communicate, propagate, or transport a program for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (non-exhaustive list) of computer-readable media include the following: an electrical connection with one or more wires (electronic device), a portable computer disk cartridge (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and programmable read-only memory (EPROM or flash memory), fiber optic devices, and portable compact disc read-only memory (CDROM). Furthermore, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or processing it in another suitable manner if necessary, and then storing it in a computer memory.

[0079] It should be understood that various parts of the present invention can be implemented using hardware, software, firmware, or a combination thereof. In the above-described embodiments, multiple steps or methods can be implemented using software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented using hardware, as in another embodiment, any one of the following technologies known in the art or a combination thereof can be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application-specific integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0080] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0081] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0082] In addition, the terms "first" and "second" used in the embodiments of the present invention are only used for descriptive purposes and should not be understood as indicating or implying relative importance, or implicitly indicating the number of technical features indicated in this embodiment. Therefore, the features defined by the terms "first" and "second" in the embodiments of the present invention can explicitly or implicitly indicate that the embodiment includes at least one of such features. In the description of the present invention, the word "plurality" means at least two or two or more, such as two, three, four, etc., unless otherwise clearly and specifically defined in the embodiments.

[0083] In the present invention, unless otherwise clearly specified or limited in the embodiments, the terms "installed," "connected," "connect," and "fixed" appearing in the embodiments should be understood in a broad sense. For example, the connection may be a fixed connection, a detachable connection, or an integral connection. It can also be a mechanical connection, an electrical connection, etc.; of course, it can also be a direct connection, or an indirect connection through an intermediate medium, or it can be internal communication between two elements, or an interaction between two elements. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood based on the specific implementation.

[0084] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0085] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A method for controlling the battery charge balance of a train compartment, characterized in that: Each carriage of the train includes a DC-DC converter assembly and a battery assembly. The high-voltage input end of the DC-DC converter assembly in each carriage is connected to the corresponding battery assembly. The low-voltage output end of the DC-DC converter assembly in each carriage is connected to a low-voltage load and connected in parallel through a corresponding extended power supply contactor. The balancing control method includes: Obtaining the SOC value of the battery assembly in each carriage; Determining a maximum SOC value and a minimum SOC value according to the SOC value of the battery assembly in each carriage, and determining an SOC difference between the maximum SOC value and the minimum SOC value; Controlling the DC-DC converter assembly and the corresponding extended power supply contactor in each carriage according to the SOC difference, so as to achieve power balancing of the battery assembly in each carriage by operating the low-voltage load; The step of controlling the DC-DC converter assembly and the corresponding extended power supply contactor in each carriage according to the SOC difference includes: When the SOC difference is greater than or equal to the first preset threshold and less than or equal to the second preset threshold, the extended power supply contactors corresponding to the car with the maximum SOC value and the car with the minimum SOC value are controlled to close, and a high-voltage power-on instruction is sent to the DC-DC converter assembly in the car with the maximum SOC value, and a high-voltage power-off instruction is sent to the DC-DC converter assembly in the car with the minimum SOC value.

2. The train compartment battery charge balancing control method according to claim 1, characterized in that: Controlling the DC-DC converter assembly and the corresponding extended power supply contactor in each carriage according to the SOC difference, further comprising: When the SOC difference is greater than a second preset threshold, the extended power supply contactors corresponding to the car with the maximum SOC value, the car with the minimum SOC value and the car with the second smallest SOC value are controlled to close, and a high-voltage power-on instruction is sent to the DC-DC converter assembly in the car with the maximum SOC value, and a high-voltage power-off instruction is sent to the DC-DC converter assembly in the car with the minimum SOC value and the DC-DC converter assembly in the car with the second smallest SOC value.

3. The train compartment battery charge balancing control method according to claim 1, characterized in that: Controlling the DC-DC converter assembly and the corresponding extended power supply contactor in each carriage according to the SOC difference, further comprising: When the SOC difference is less than a first preset threshold, the extended power supply contactor corresponding to each carriage is controlled to be disconnected, and a high-voltage power-on instruction is sent to the DC-DC converter assembly in each carriage.

4. The method for controlling the battery charge balance of a train compartment according to any one of claims 1 to 3, wherein: When the DC-DC converter assembly in each carriage receives the high-voltage power-on command, it converts the first direct current provided by the corresponding battery assembly into a second direct current to power the low-voltage load, wherein the voltage of the second direct current is lower than the voltage of the first direct current.

5. A computer-readable storage medium, characterized in that A train compartment battery power balancing control program is stored thereon, and when the program is executed by a processor, a train compartment battery power balancing control method as described in any one of claims 1 to 4 is implemented.

6. A vehicle controller, characterized in that: The vehicle controller includes a memory, a processor, and a train car battery power balancing control program stored in the memory and runnable on the processor. When the program is executed by the processor, the train car battery power balancing control method as described in any one of claims 1-5 is implemented.

7. A train compartment battery power balance control system, characterized in that: include: A battery manager, a DC-DC converter assembly, and a battery assembly are provided in each carriage of the train, wherein the high-voltage input end of the DC-DC converter assembly in each carriage is connected to the corresponding battery assembly, and the low-voltage output end of the DC-DC converter assembly in each carriage is connected to a low-voltage load, and the two are connected in parallel through corresponding extended power supply contactors. The battery manager in each carriage is used to determine the SOC value of the corresponding battery assembly; a vehicle controller, the vehicle controller communicating with the battery manager and the DC-DC converter assembly in each car respectively, for obtaining the SOC value of the battery assembly in each car, determining a maximum SOC value and a minimum SOC value based on the SOC value of the battery assembly in each car, and determining an SOC difference between the maximum SOC value and the minimum SOC value, and controlling the DC-DC converter assembly and the corresponding extended power supply contactor in each car based on the SOC difference, so as to achieve charge balancing for the battery assembly in each car by operating the low-voltage load; Wherein, the vehicle controller is also used for: When the SOC difference is greater than or equal to the first preset threshold and less than or equal to the second preset threshold, the extended power supply contactors corresponding to the car with the maximum SOC value and the car with the minimum SOC value are controlled to close, and a high-voltage power-on instruction is sent to the DC-DC converter assembly in the car with the maximum SOC value, and a high-voltage power-off instruction is sent to the DC-DC converter assembly in the car with the minimum SOC value.

8. The train compartment battery power balancing control system according to claim 7, characterized in that: The vehicle controller is also used to: When the SOC difference is greater than a second preset threshold, the extended power supply contactors corresponding to the car with the maximum SOC value, the car with the minimum SOC value and the car with the second smallest SOC value are controlled to close, and a high-voltage power-on instruction is sent to the DC-DC converter assembly in the car with the maximum SOC value, and a high-voltage power-off instruction is sent to the DC-DC converter assembly in the car with the minimum SOC value and the DC-DC converter assembly in the car with the second smallest SOC value.

9. The train compartment battery power balancing control system according to claim 7, characterized in that: The vehicle controller is also used to control the extended power supply contactor corresponding to each car to disconnect when the SOC difference is less than a first preset threshold, and send a high-voltage power-on instruction to the DC-DC converter assembly in each car.

10. The train compartment battery power balancing control system according to any one of claims 7 to 9, characterized in that: When the DC-DC converter assembly in each carriage receives the high-voltage power-on command, it converts the first direct current provided by the corresponding battery assembly into a second direct current to power the low-voltage load, wherein the voltage of the second direct current is lower than the voltage of the first direct current.

11. A train, characterized in that: The train comprises a train carriage battery power balancing control system according to any one of claims 7 to 10.

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