High-voltage power supply system for electric rack railcars

Abstract

This invention relates to the field of power supply technology for mining vehicles, and provides a high-voltage power supply system for electric rack railcars, comprising: at least two sets of high-voltage power supply units, each set including: a first explosion-proof power supply box and a second explosion-proof power supply box, the negative output terminal of the first explosion-proof power supply box being connected to the positive output terminal of the second explosion-proof power supply box to form a series structure; a first traction converter and a second traction converter, the first explosion-proof power supply box having a first positive output interface and a second positive output interface, respectively connected to the positive input terminals of the first and second traction converters; the second explosion-proof power supply box having a first negative output interface and a second negative output interface, respectively connected to the negative input terminals of the first and second traction converters. This satisfies the heavy-load traction requirements of electric rack railcars on long distances and steep gradients.

Description

Technical Field

[0001] This invention relates to the field of power supply technology for mining vehicles, and in particular to a high-voltage power supply system for electric rack railcars. Background Technology

[0002] Currently, rack railcars and similar equipment play an irreplaceable role in the field of auxiliary transportation in coal mines. At present, these devices are mostly powered by traditional explosion-proof diesel engines. However, explosion-proof diesel engines have significant drawbacks in practical applications, including severe exhaust pollution, high operating noise, and low energy conversion efficiency.

[0003] In recent years, lithium-ion batteries have been gradually applied to mining auxiliary transportation equipment. However, existing mining battery power systems are typically low-voltage and small-capacity systems, which have significant shortcomings in overall system integration, explosion-proof design, and battery management strategies. This is especially true for rack railcars, a specialized piece of equipment with extremely complex and demanding operating conditions. They often face heavy-load traction on steep slopes, frequent and severe mechanical vibrations, and high-risk environments such as potential methane and coal dust explosions. Existing battery systems cannot effectively address these challenges, limiting power output and compromising safety and reliability. Summary of the Invention

[0004] This invention provides a high-voltage power supply system for electric rack railcars, which can boost the overall output voltage to the high-voltage level required by the rack railcar, effectively reducing the wiring harness current during high-power output, reducing heat generation and line loss, and meeting the heavy-load traction requirements of electric rack railcars on long distances and steep slopes.

[0005] This invention provides a high-voltage power supply system for an electric rack railcar, comprising: at least two high-voltage power supply units, each of which includes: The first power supply explosion-proof box and the second power supply explosion-proof box are connected in series, with the negative output terminal of the first power supply explosion-proof box connected to the positive output terminal of the second power supply explosion-proof box. The first traction converter and the second traction converter are provided. The first power supply explosion-proof box has a first positive output interface and a second positive output interface, which are respectively connected to the positive input terminals of the first traction converter and the second traction converter. The second power supply explosion-proof box has a first negative output interface and a second negative output interface, which are respectively connected to the negative input terminals of the first traction converter and the second traction converter.

[0006] According to the present invention, a high-voltage power supply system for an electric rack railcar is provided, wherein the first power supply explosion-proof box is provided with a first discharge circuit and a second discharge circuit connected in parallel; wherein the first discharge circuit is connected to the positive input terminal of the first traction converter through the first positive output interface, and the second discharge circuit is connected to the positive input terminal of the second traction converter through the second positive output interface.

[0007] According to the present invention, a high-voltage power supply system for an electric rack railcar is provided, wherein the first discharge circuit and the second discharge circuit both include a main discharge branch and a pre-discharge branch connected in parallel. The main discharge branch is connected in series with a first main switch, and the pre-discharge branch is connected in series with a pre-charge contactor and a current-limiting resistor. The main discharge branch and the pre-discharge branch are connected in parallel and then connected in series with a first fuse.

[0008] A high-voltage power supply system for an electric rack railcar provided by the present invention further includes: The auxiliary power supply module includes an auxiliary positive output interface in the first power supply explosion-proof box, which is connected to the positive input terminal of the auxiliary power supply module; and an auxiliary negative output interface in the second power supply explosion-proof box, which is connected to the negative input terminal of the auxiliary power supply module.

[0009] According to the present invention, a high-voltage power supply system for an electric rack railcar is provided, wherein the first power supply explosion-proof box is provided with a first charging interface to be connected to a corresponding first charging device; the first charging interface is respectively connected to a first charging circuit and the negative output terminal of the first power supply explosion-proof box, the first charging circuit is connected to the positive terminal of a first battery pack located inside the first power supply explosion-proof box, wherein a second fuse and a first control switch are connected in series in the first charging circuit.

[0010] According to the present invention, a high-voltage power supply system for an electric rack railcar is provided, wherein the second power supply explosion-proof box is provided with a second charging interface for connecting to a corresponding second charging device; the second charging interface is respectively connected to the second charging circuit and the negative output terminal of the second power supply explosion-proof box, the second charging circuit is connected to the positive terminal of the second battery pack located inside the second power supply explosion-proof box, wherein a third fuse and a second control switch are connected in series in the second charging circuit.

[0011] According to the present invention, a high-voltage power supply system for an electric rack railcar is provided, wherein the first power supply explosion-proof box integrates a first DC / DC converter module for converting high-voltage DC power into 24V low-voltage DC power and outputting it externally.

[0012] According to the present invention, a high-voltage power supply system for an electric rack railcar is provided, wherein the second power supply explosion-proof box integrates a second DC / DC converter module for converting high-voltage DC power into 24V low-voltage DC power and outputting it externally.

[0013] According to the present invention, a high-voltage power supply system for an electric rack railcar is provided, wherein a first battery pack in the first power supply explosion-proof box and a second battery pack in the second power supply explosion-proof box each include a second main switch, a fourth fuse, a current sensor and multiple battery modules, wherein the second main switch, the multiple battery modules, the fourth fuse and the current sensor are connected in series.

[0014] According to the present invention, a high-voltage power supply system for an electric rack railcar is provided, wherein the second power supply explosion-proof box is provided with a discharge interface, the discharge interface being connected to a third discharge circuit and the negative output terminal of the second power supply explosion-proof box, wherein the third discharge circuit is connected to the positive terminal of a second battery pack located inside the second power supply explosion-proof box.

[0015] The high-voltage power supply system for electric rack railcars provided by this invention connects the negative output terminal of the first explosion-proof power supply box to the positive output terminal of the second explosion-proof power supply box, thus forming a series structure electrically. This allows the overall output voltage to be increased to the high-voltage level required by the rack railcar, effectively reducing the wiring current during high-power output, reducing heat generation and line loss, and meeting the heavy-load traction requirements of electric rack railcars on long distances and steep slopes. The modular, series-connected explosion-proof power supply box design not only effectively reduces the size and weight of individual explosion-proof power supply boxes, but also facilitates flexible installation and daily maintenance in the confined space of underground coal mines. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is an electrical schematic diagram of the high-voltage power supply system for an electric rack railcar provided by the present invention.

[0018] Figure label: 1. First power supply explosion-proof box; 11. First battery pack; 2. Second power supply explosion-proof box; 21. Second battery pack; 3. Traction converter explosion-proof box; 31. First traction converter; 32. Second traction converter; 33. Auxiliary power module; 4. First charging device; 5. Second charging device. Detailed Implementation

[0019] To enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0020] It should be noted that when a component is referred to as "fixed to" or "set on" another component, it can be directly on or indirectly set on another component; when a component is referred to as "connected to" another component, it can be directly connected to or indirectly connected to another component.

[0021] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0022] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "a plurality of" or "several" means two or more, unless otherwise explicitly specified.

[0023] It should be noted that the structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which this application can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size should still fall within the scope of the technical content disclosed in this application, provided that they do not affect the effects and purposes that this application can produce.

[0024] like Figure 1 As shown, the high-voltage power supply system for an electric rack railcar according to an embodiment of the present invention includes: at least two sets of high-voltage power supply units, each set of high-voltage power supply units including: a first power supply explosion-proof box 1 and a second power supply explosion-proof box 2, wherein the negative output terminal of the first power supply explosion-proof box 1 is connected to the positive output terminal of the second power supply explosion-proof box 2 to form a series structure; a first traction converter 31 and a second traction converter 32, wherein the first power supply explosion-proof box 1 has a first positive output interface and a second positive output interface, which are respectively connected to the positive input terminals of the first traction converter 31 and the second traction converter 32; and the second power supply explosion-proof box 2 has a first negative output interface and a second negative output interface, which are respectively connected to the negative input terminals of the first traction converter 31 and the second traction converter 32.

[0025] Specifically, the negative output terminal of the first power supply explosion-proof box 1 is connected to the positive output terminal of the second power supply explosion-proof box 2, thus forming a series structure electrically. This can raise the overall output voltage to the high voltage level required by the rack railcar, effectively reducing the wiring harness current during high power output, reducing heat generation and line loss, and meeting the heavy-load traction requirements of the electric rack railcar on long distances and steep slopes.

[0026] It should be noted that the first traction converter 31 and the second traction converter 32 are integrated into the explosion-proof enclosure 3 of the traction converter. This means that the long and narrow spaces in underground coal mine roadways severely limit the dimensions of the rack railcar. Integrating the two traction converters into a single explosion-proof enclosure 3 allows them to share the enclosure shell and some internal support structures, significantly reducing the overall volume and weight of the equipment, greatly improving the utilization rate of the vehicle's space, and freeing up valuable space for other onboard equipment.

[0027] It is understandable that this embodiment adopts a modular, series-connected power supply explosion-proof box design, which not only effectively reduces the size and weight of a single power supply explosion-proof box, but also facilitates flexible installation and daily maintenance in the confined space of underground coal mines.

[0028] In an optional embodiment, the first power supply explosion-proof box 1 is provided with a first discharge circuit and a second discharge circuit connected in parallel; wherein, the first discharge circuit is connected to the positive input terminal of the first traction converter 31 through a first positive output interface, and the second discharge circuit is connected to the positive input terminal of the second traction converter 32 through a second positive output interface.

[0029] Specifically, inside the first power supply explosion-proof box 1, the positive terminal of the first battery pack 11 is divided into two parallel independent branches before output, namely the first discharge circuit and the second discharge circuit. These two discharge circuits are independent in both physical space and electrical logic. The first discharge circuit extends to the first positive output interface on the explosion-proof box and is precisely connected to the positive input terminal of the first traction converter 31 inside the traction converter explosion-proof box 3 through an external high-voltage explosion-proof wiring harness; similarly, the second discharge circuit extends to the second positive output interface on the explosion-proof box and is connected to the positive input terminal of the second traction converter 32.

[0030] In practical applications, both the first discharge circuit and the second discharge circuit include a main discharge branch and a pre-discharge branch connected in parallel. The main discharge branch is connected in series with the first main switch, and the pre-discharge branch is connected in series with the pre-charge contactor and the current-limiting resistor. The main discharge branch and the pre-discharge branch are connected in parallel and then connected in series with the first fuse.

[0031] It should be noted that during system startup, the pre-charge contactor is first closed, and high-voltage DC current slowly pre-charges the front-end capacitor of the traction converter through the current-limiting resistor. When the voltage at the traction converter terminal is detected to rise to near the voltage of the first battery pack 11 bus (reaching the safety threshold), the first main switch is then closed to conduct the main amplifier branch, and the pre-charge contactor is subsequently disconnected. This pre-charge mechanism effectively prevents high current from causing capacitor breakdown damage.

[0032] Understandably, the first fuse acts as the overall protective barrier for this discharge circuit, connected in series on the main circuit. When a serious short circuit or overcurrent occurs in the corresponding external explosion-proof wiring harness or converter, the fuse can quickly melt and disconnect the physical circuit within milliseconds, effectively preventing the accident from escalating and battery thermal runaway, ensuring that a single circuit failure will not cause catastrophic damage to the entire power supply explosion-proof box.

[0033] In optional embodiments, such as Figure 1 As shown, the high-voltage power supply system for the electric rack railcar also includes an auxiliary power module 33, which is integrated into the traction converter explosion-proof box 3. Specifically, the first power supply explosion-proof box 1 is further provided with an auxiliary positive output interface, which is connected to the positive input terminal of the auxiliary power module 33; the second power supply explosion-proof box 2 is further provided with an auxiliary negative output interface, which is connected to the negative input terminal of the auxiliary power module 33.

[0034] It should be noted that the auxiliary power module 33 can directly obtain the highest total voltage of the system after the first power supply explosion-proof box 1 and the second power supply explosion-proof box 2 are connected in series. This provides a sufficient and stable power source for the high-power auxiliary equipment on the rack railcar. By directly integrating the auxiliary power module 33 into the explosion-proof box 3 of the traction converter, the cumbersome steps of designing and installing a separate explosion-proof enclosure for the auxiliary power supply are eliminated, reducing the overall size and weight of the equipment.

[0035] In optional embodiments, such as Figure 1 As shown, the first power supply explosion-proof box 1 is provided with a first charging interface to connect to the corresponding first charging device 4; the first charging interface is connected to the first charging circuit and the negative output terminal of the first power supply explosion-proof box 1 respectively, the first charging circuit is connected to the positive terminal of the first battery pack 11 located in the first power supply explosion-proof box 1, wherein a second fuse and a first control switch are connected in series in the first charging circuit.

[0036] To meet the high-efficiency energy replenishment needs of underground or surface coal mines, the first power supply explosion-proof box 1 is equipped with a dedicated first charging interface on its shell for connection to an external independent first charging device 4. Inside the explosion-proof box, the positive terminal of the first charging interface is connected to a dedicated first charging circuit, which is connected in series with a second fuse and a first control switch, and finally merges into the positive bus of the first battery pack 11 inside the first power supply explosion-proof box 1; while the negative terminal of the first charging interface is directly connected to the negative bus of the first power supply explosion-proof box 1, thus forming a complete, closed-loop independent charging channel.

[0037] In optional embodiments, such as Figure 1 As shown, the second power supply explosion-proof box 2 is provided with a second charging interface to connect to the corresponding second charging device 5; the second charging interface is connected to the negative output terminal of the second charging circuit and the second power supply explosion-proof box 2 respectively, and the second charging circuit is connected to the positive terminal of the second battery pack 21 located inside the second power supply explosion-proof box 2. The second charging circuit is provided with a third fuse and a second control switch connected in series.

[0038] To meet the high-efficiency energy replenishment needs of underground or surface coal mines, the second power supply explosion-proof box 2 is equipped with a dedicated second charging interface on its shell for connection to an external independent second charging device 5. Inside the explosion-proof box, the positive terminal of the second charging interface is connected to a dedicated second charging circuit, which is connected in series with a third fuse and a second control switch, ultimately converging into the positive busbar of the second battery pack 21 inside the second power supply explosion-proof box 2; while the negative terminal of the second charging interface is directly connected to the negative busbar of the second power supply explosion-proof box 2, thus forming a complete, closed-loop independent charging channel.

[0039] In optional embodiments, such as Figure 1 As shown, the first power supply explosion-proof box 1 integrates a first DC / DC converter module, which is used to convert high-voltage DC power into 24V low-voltage DC power and output it to the outside.

[0040] In this embodiment, a first DC / DC converter module is highly integrated and installed inside the first power supply explosion-proof box 1. Electrically, the high-voltage input terminal of this first DC / DC converter module is directly connected to the high-voltage DC bus of the first battery pack 11 inside the first power supply explosion-proof box 1, obtaining high-voltage power from nearby sources. Its low-voltage output terminal is connected to a dedicated low-voltage output interface on the shell of the first power supply explosion-proof box 1 via a low-voltage protection switch, thereby continuously and stably outputting 24V low-voltage DC power to the outside of the explosion-proof box.

[0041] In optional embodiments, such as Figure 1 As shown, the second power supply explosion-proof box 2 integrates a second DC / DC converter module, which is used to convert high-voltage DC power into 24V low-voltage DC power and output it to the outside.

[0042] In this embodiment, a second DC / DC converter module is highly integrated into the internal space of the second power supply explosion-proof box 2. Electrically, the high-voltage input terminal of this second DC / DC converter module is directly connected to the high-voltage DC bus of the second battery pack 21 inside the second power supply explosion-proof box 2, obtaining high-voltage power from nearby sources. Its low-voltage output terminal is connected to a dedicated low-voltage output interface on the shell of the second power supply explosion-proof box 2 via a low-voltage protection switch, thereby continuously and stably outputting 24V low-voltage DC power to the outside of the explosion-proof box.

[0043] In optional embodiments, such as Figure 1 As shown, the first battery pack 11 in the first power supply explosion-proof box 1 and the second battery pack 21 in the second power supply explosion-proof box 2 both include a second main switch, a fourth fuse, a current sensor and multiple battery modules. The second main switch, multiple battery modules, the fourth fuse and the current sensor are connected in series.

[0044] As an example, multiple battery modules are specifically composed of 100 individual lithium-ion cells connected in series to form either a first battery pack 11 or a second battery pack 21. The rated voltage of each individual lithium-ion cell is 3.2V, and its rated capacity is 230Ah. The operating voltage range of the high-voltage power supply system for the electric rack railcar in this embodiment of the invention is DC550V~DC700V.

[0045] A second main switch and a fourth fuse are installed at the very front of the battery pack, forming a dual physical isolation mechanism from active control to passive defense. When the system is in hibernation or experiences a serious fault, the BMS can actively disconnect the second main switch, cutting off the high voltage inside the entire explosion-proof enclosure at its source. In the event of extreme short circuits or main switch failure, the fourth fuse can instantly melt based on purely physical characteristics. In this way, the high voltage risk can be completely contained inside the explosion-proof enclosure, completely preventing the spillover of disasters.

[0046] In addition, the current sensor connected in series in the main circuit can perform high-frequency, high-precision sampling of transient and steady-state currents during the charging and discharging process of the battery pack at the millisecond level. This real-time data is the core basis for the battery management system to perform ampere-hour integration, accurately estimate the battery's state of charge and health, and execute dynamic overcurrent protection strategies, thus endowing it with intelligent operation capabilities.

[0047] It is particularly important to note that the internal spaces of the first power supply explosion-proof box 1 and the second power supply explosion-proof box 2 are physically isolated into independent battery chambers and electrical chambers. Specifically, the energy storage core, i.e., the battery pack, is centrally located in the battery chamber. Simultaneously, to ensure operational safety and refined management in the extreme underground environment, the battery chamber is also equipped with a manual isolation contactor (second main switch) for safe maintenance power-off, as well as voltage and temperature sensors for real-time acquisition of individual cell operating data. The electrical chamber centrally houses the system's high-voltage control logic and core electrical components, specifically including the aforementioned charging and discharging circuits, and the battery management system (BMS) master or slave module responsible for overall status monitoring and logic operations.

[0048] Specifically, the battery management system mainly consists of hardware such as a protection circuit board, a cell voltage sampling module, a temperature sampling module, and an equalization circuit. In actual operation, the battery management system can monitor the real-time voltage, surface temperature, and main current in the charging and discharging circuit of each individual cell with high precision and in real time. Based on the above multi-dimensional operating data, the battery management system performs dynamic control of the current loop: when all parameters are within the normal set range, it controls the relays (or explosion-proof contactors) in the main circuit to remain in the conducting state, so that the internal cells are normally connected to the external electrical circuit to output or receive electrical energy; once the voltage, temperature, or loop current of any cell exceeds the preset safety protection threshold, the battery management system will respond quickly and immediately control the corresponding relay to shut down, cutting off the charging and discharging physical circuit in milliseconds. Through the above-mentioned mechanism of combining active monitoring and passive defense, this system can not only effectively prevent the battery pack from overcharging, over-discharging, overcurrent and thermal runaway, and effectively protect the intrinsic safety of the battery cells, but also achieve intelligent management through the internal equalization circuit, thereby significantly extending the overall cycle life of the mining power battery pack and effectively ensuring the continuous and stable operation of the rack railcar power system under harsh working conditions.

[0049] In optional embodiments, such as Figure 1 As shown, the second power supply explosion-proof box 2 is equipped with a discharge interface, which is connected to the third discharge circuit and the negative output terminal of the second power supply explosion-proof box 2 respectively. The third discharge circuit is connected to the positive terminal of the second battery pack 21 located inside the second power supply explosion-proof box 2.

[0050] It should be noted that an additional independent discharge interface is extended from the casing of the second power supply explosion-proof box 2. Inside, the positive terminal of this discharge interface is connected to a dedicated third discharge circuit, the other end of which is directly powered by the positive busbar of the second battery pack 21. Simultaneously, the negative terminal of this discharge interface is connected to the negative output terminal of the second power supply explosion-proof box 2. Preferably, the third discharge circuit has the same structural composition as the second discharge circuit.

[0051] Finally, it should be noted that the terms "parallel" and "perpendicular" in the embodiments of this invention should not be strictly limited to a geometric sense. At least manufacturing and installation errors should be considered. For example, an error of ±10° should be within the protection range of the embodiments of this invention. The above embodiments are only used to illustrate the technical solutions of this invention, and not to limit it. Although the invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this invention.

Claims

1. A high-voltage power supply system for an electric rack railcar, characterized in that, include: At least two sets of high-voltage power supply units, each set of said high-voltage power supply unit includes: The first power supply explosion-proof box and the second power supply explosion-proof box are connected in series, with the negative output terminal of the first power supply explosion-proof box connected to the positive output terminal of the second power supply explosion-proof box. The first traction converter and the second traction converter are provided. The first power supply explosion-proof box has a first positive output interface and a second positive output interface, which are respectively connected to the positive input terminals of the first traction converter and the second traction converter. The second power supply explosion-proof box has a first negative output interface and a second negative output interface, which are respectively connected to the negative input terminals of the first traction converter and the second traction converter.

2. The high-voltage power supply system for an electric rack railcar according to claim 1, characterized in that, The first power supply explosion-proof box is equipped with a first discharge circuit and a second discharge circuit connected in parallel; wherein, the first discharge circuit is connected to the positive input terminal of the first traction converter through the first positive output interface, and the second discharge circuit is connected to the positive input terminal of the second traction converter through the second positive output interface.

3. The high-voltage power supply system for an electric rack railcar according to claim 2, characterized in that, Both the first discharge circuit and the second discharge circuit include a main discharge branch and a pre-discharge branch connected in parallel. The main discharge branch is connected in series with a first main switch, and the pre-discharge branch is connected in series with a pre-charge contactor and a current-limiting resistor. The main discharge branch and the pre-discharge branch are connected in parallel and then connected in series with a first fuse.

4. The high-voltage power supply system for an electric rack railcar according to claim 1, characterized in that, Also includes: The auxiliary power supply module includes an auxiliary positive output interface in the first power supply explosion-proof box, which is connected to the positive input terminal of the auxiliary power supply module; and an auxiliary negative output interface in the second power supply explosion-proof box, which is connected to the negative input terminal of the auxiliary power supply module.

5. The high-voltage power supply system for an electric rack railcar according to claim 1, characterized in that, The first power supply explosion-proof box is provided with a first charging interface to connect to the corresponding first charging device; the first charging interface is connected to the first charging circuit and the negative output terminal of the first power supply explosion-proof box respectively; the first charging circuit is connected to the positive terminal of the first battery pack located inside the first power supply explosion-proof box; wherein, a second fuse and a first control switch are connected in series in the first charging circuit.

6. The high-voltage power supply system for an electric rack railcar according to claim 1, characterized in that, The second power supply explosion-proof box is provided with a second charging interface to connect to the corresponding second charging device; the second charging interface is connected to the second charging circuit and the negative output terminal of the second power supply explosion-proof box respectively, the second charging circuit is connected to the positive terminal of the second battery pack located inside the second power supply explosion-proof box, wherein a third fuse and a second control switch are connected in series in the second charging circuit.

7. The high-voltage power supply system for an electric rack railcar according to claim 1, characterized in that, The first power supply explosion-proof box integrates a first DC / DC converter module, which is used to convert high-voltage DC power into 24V low-voltage DC power and output it to the outside.

8. The high-voltage power supply system for an electric rack railcar according to claim 1, characterized in that, The second power supply explosion-proof box integrates a second DC / DC converter module, which is used to convert high-voltage DC power into 24V low-voltage DC power and output it to the outside.

9. The high-voltage power supply system for an electric rack railcar according to claim 1, characterized in that, The first battery pack in the first power supply explosion-proof box and the second battery pack in the second power supply explosion-proof box each include a second main switch, a fourth fuse, a current sensor, and multiple battery modules. The second main switch, the multiple battery modules, the fourth fuse, and the current sensor are connected in series.

10. The high-voltage power supply system for an electric rack railcar according to claim 1, characterized in that, The second power supply explosion-proof box is equipped with a discharge interface, which is connected to the third discharge circuit and the negative output terminal of the second power supply explosion-proof box. The third discharge circuit is connected to the positive terminal of the second battery pack located inside the second power supply explosion-proof box.

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