Pure power battery locomotive and self-load test and energy exchange control method and system thereof

Abstract

The application discloses a pure power battery locomotive and a self-load test and energy exchange control method and system thereof. The method comprises the following steps: determining one of at least two groups of battery groups as a measured battery group, and the rest of the battery groups as non-measured battery groups; controlling the measured battery group to be in a discharging mode, at least one group of the non-measured battery groups to be in the discharging mode, and the energy storage device to be in a charging mode; controlling the measured battery group, the non-measured battery group in the discharging mode and the energy storage device to be connected with a direct-current bus of the locomotive; if a test condition is met, controlling the measured battery group to activate the test, charging the non-measured battery group in the charging mode and the energy storage device through the direct-current bus of the locomotive, and supplying energy to the auxiliary system. The application can reduce energy waste when the pure power battery locomotive is tested under self-load.

Description

Technical Field

[0001] This invention relates to the field of rail transportation technology, and in particular to a pure power battery locomotive and its self-load testing and energy exchange control method and system. Background Technology

[0002] With the research and development of new energy locomotives and the continuous development of the power battery industry, and considering that the operating cost of pure power battery locomotives is 30-50% lower than that of diesel locomotives in short-distance, low-speed shunting operations, pure power battery locomotives have gradually become industrialized. However, after the onboard power battery is repaired or replaced, a self-load test is required on the locomotive itself.

[0003] Currently, the self-load test method for pure electric vehicle batteries involves using the full power output of the battery to consume this power through an on-board braking resistor or by connecting it to an external water resistance device via a cable for water resistance testing. This results in energy waste and a loss of economic efficiency. Summary of the Invention

[0004] This invention provides a pure electric vehicle powered by a battery and a method and system for self-load testing and energy exchange control to reduce energy waste.

[0005] According to one aspect of the present invention, a method for self-load testing and energy exchange control of a pure power battery locomotive is provided. The pure power battery locomotive includes an energy storage device connected to the locomotive's DC bus, a power battery, and an auxiliary system; wherein the power battery includes at least two battery packs; the method for self-load testing and energy exchange control of the pure power battery locomotive includes:

[0006] At least two sets of battery packs are identified as the battery pack under test, and the remaining battery packs are not the battery packs under test.

[0007] The test battery pack is controlled to be in discharge mode, at least one group of non-test battery packs is controlled to be in discharge mode, and the energy storage device is controlled to be in charging mode.

[0008] The tested battery pack, the non-tested battery pack in discharge mode, and the energy storage device are all connected to the locomotive DC bus.

[0009] If the test conditions are met, the test is activated by controlling the battery pack under test. The non-tested battery pack and the energy storage device, which are in charging mode, are charged through the locomotive DC bus, and the auxiliary system is powered.

[0010] Optionally, the test conditions include: locomotive occupancy, power battery commissioning, bus voltage establishment, and normal operation of the auxiliary system.

[0011] Optionally, the method for determining the test conditions specifically includes:

[0012] Determine if the locomotive is occupied;

[0013] If so, then control the power battery and the energy storage device to be connected to the locomotive DC bus, and control the energy storage device to discharge;

[0014] Determine whether the capacity of the energy storage device is less than the minimum capacity threshold;

[0015] If so, the energy storage device is controlled to switch to a state of neither charging nor discharging, and the power battery is controlled to switch to discharging.

[0016] Determine if the bus voltage has been established;

[0017] If so, the auxiliary system is powered by the locomotive's DC bus and operates normally.

[0018] Optionally, before controlling the activated test of the battery pack under test, the method further includes:

[0019] Access the test interface through the human-computer interaction interface;

[0020] Determine if the locomotive is stationary; if so, execute the step of controlling the activated test of the battery pack under test; otherwise, exit the test.

[0021] Optionally, the activation test of the battery pack under test, charging of the non-tested battery pack and the energy storage device in charging mode via the locomotive DC bus, and power supply to the auxiliary system specifically include:

[0022] The battery pack under test charges the non-battery pack that is in charging mode through the locomotive DC bus.

[0023] If the SOC of the non-tested battery pack is greater than the full charge setting value, then the non-tested battery pack will no longer be charged, and the tested battery pack will charge the energy storage device in charging mode through the DC bus.

[0024] If the capacity of the energy storage device is greater than the maximum capacity threshold, the test is terminated.

[0025] The battery pack under test continuously supplies power to the auxiliary system through the locomotive's DC bus.

[0026] Optionally, when controlling the activated test of the battery pack under test, charging the non-tested battery pack and the energy storage device in charging mode through the locomotive DC bus, and supplying power to the auxiliary system, the method further includes:

[0027] The discharge power of the battery pack under test, the charging power of the non-tested battery pack, and the energy storage device are dynamically adjusted according to the current test level.

[0028] Optionally, after exiting the test, the following may also be included:

[0029] The energy storage device supplies power to the auxiliary system and traction system through the locomotive DC bus;

[0030] If the energy storage device is exhausted, the power battery will supply power to the auxiliary system and the traction system through the locomotive DC bus.

[0031] According to another aspect of the present invention, a self-load test and energy exchange control system for a pure power battery locomotive is provided, comprising a controller, an energy storage device connected to the locomotive's DC bus, a power battery, and an auxiliary system; wherein the power battery comprises at least two battery packs;

[0032] The controller executes the self-load test and energy exchange control method for pure power battery locomotives as described in any embodiment of the present invention.

[0033] According to another aspect of the present invention, a pure power battery locomotive is provided, including a pure power battery locomotive self-load test and energy exchange control system as described in any embodiment of the present invention.

[0034] This invention provides a self-load test for the power batteries of a pure electric vehicle. It allows power batteries to exchange energy via the locomotive's DC bus, enabling self-load testing without the need for an external load. Specifically, during the test, the energy of one battery pack is directly transferred to other battery packs via the locomotive's DC bus, thereby reducing energy consumption. To avoid the battery packs being fully charged during the test, an energy storage device is added. This device stores excess energy for a short period, enabling energy collection and reuse, further reducing energy waste.

[0035] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 This is a schematic diagram of a power battery connection method in a pure power battery locomotive provided by an embodiment of the present invention;

[0038] Figure 2 This is a flowchart illustrating a self-load test and energy exchange control method for a pure power battery locomotive, provided in an embodiment of the present invention.

[0039] Figure 3 A flowchart illustrating another method for self-load testing and energy exchange control of a pure power battery locomotive provided in an embodiment of the present invention;

[0040] Figure 4 This is a schematic diagram of energy exchange when the SOC of a non-tested power battery pack is less than or equal to the full charge setting value, provided by an embodiment of the present invention.

[0041] Figure 5 This is a schematic diagram of energy exchange when the SOC of a non-tested power battery pack is greater than the full charge setting value, provided by an embodiment of the present invention.

[0042] Figure 6 This is a schematic diagram of energy exchange when the SOC of a non-tested battery pack is greater than the full charge setting value and the energy storage of the energy storage device is greater than the maximum capacity threshold, as provided in an embodiment of the present invention.

[0043] Figure 7 This is a schematic diagram of energy exchange when the energy storage of an energy storage device is less than the minimum capacity threshold, as provided in an embodiment of the present invention. Detailed Implementation

[0044] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0045] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0046] As described in the background section, existing self-load testing methods suffer from energy waste. Specifically, in one related technology, to address the energy loss problem during diesel engine self-load testing in hybrid electric vehicles, an external energy storage device is installed on the ground to store the diesel engine's self-load energy. Simultaneously, when the state of charge (SOC) of the power battery is low, the energy stored in the energy storage device can recharge the power battery, thus achieving energy reuse. However, this method is only applicable to locomotives with a diesel engine and power battery combination, and cannot be used for locomotives with only a power battery; furthermore, the locomotive's flexibility is affected because it needs to be at a fixed location to charge the power battery.

[0047] In another related technology, the current power consumption of each of the relevant electrical appliances in the vehicle, excluding the target power component, is acquired in real time. Following the principle of constant power consumption of the power battery, the current power requirement of the target power component is determined based on the current power consumption of all relevant electrical appliances and the specified test power of the power battery. The target power component is then controlled to operate according to the current power requirement, and the performance evaluation parameters of the power battery are acquired in real time. Thus, the power battery testing method achieves a fixed test power for the power battery during the testing process by dynamically adjusting the power of the target power component, thereby obtaining accurate quantitative data of the power battery and accurately determining its performance. However, this method is only applicable to automotive battery testing; and energy is consumed during the power battery testing process, requiring external charging to replenish the battery after the test, resulting in poor economic efficiency.

[0048] In view of this, embodiments of the present invention provide a self-load test and energy exchange control method for pure power battery locomotives, applicable to pure power battery locomotives, to reduce energy waste.

[0049] Figure 1 This is a schematic diagram illustrating a power battery connection method in a pure power battery locomotive, provided as an embodiment of the present invention. See also... Figure 1 The pure battery locomotive includes a power battery 100 connected to the locomotive's DC bus, an energy storage device 200, and an auxiliary system. Figure 1 (Not shown in the image). The power battery 100 is installed on the locomotive and is an on-board power battery; the energy storage device 200 is installed on the locomotive and is an on-board energy storage device. The power battery 100 includes at least two battery packs 110 (including battery pack 1, battery pack 2, ..., battery pack N); the auxiliary system (or auxiliary load) is electrical equipment that assists the operation of the pure power battery locomotive, such as a controller, charging and discharging equipment for the battery packs 110, etc. Furthermore, the energy storage device 200 and each battery pack 110 are connected to the locomotive's DC bus via a rectifier 300 so that the voltage of the energy storage device 200 and each battery pack 110 can match the voltage of the locomotive's DC bus.

[0050] Figure 2 This is a flowchart illustrating a self-load testing and energy exchange control method for a pure power battery locomotive, provided as an embodiment of the present invention. See also... Figure 2 The self-load test and energy exchange control method for this pure power battery locomotive includes the following steps:

[0051] S110. Identify one of at least two battery packs as the battery pack to be tested, and the remaining battery packs as non-tested battery packs.

[0052] S120, control the tested battery pack to discharge mode, at least one non-tested battery pack to discharge mode, and the energy storage device to charge mode.

[0053] S130, the controlled battery pack under test, the non-tested battery pack in discharge mode and the energy storage device are all connected to the locomotive DC bus.

[0054] S140. If the test conditions are met, the test battery pack is activated and charged through the locomotive DC bus to charge the non-test battery pack and energy storage device in charging mode, as well as to supply power to the auxiliary system.

[0055] The power battery 100 includes at least two battery packs 110. During locomotive self-load testing, each battery pack 110 needs to be tested individually. For example, battery pack 1 is initially designated as the battery pack under test, while battery packs 2 through N are not under test. After battery pack 1 is tested, battery pack 2 is designated as the battery pack under test, while battery packs 1, 3, and N are not under test; and so on, until all battery packs 110 are tested. During the test, the battery pack under test is in discharge mode, while the non-tested battery packs are in charging mode. Energy exchange occurs between the battery packs under test and the non-tested battery packs through the locomotive's DC bus. It should be noted that, typically, the number of non-tested battery packs is greater than the number of tested battery packs; therefore, the non-tested battery packs can fully receive the discharge capacity of the tested battery packs. In some cases, the non-tested battery packs may not be able to fully receive the discharge capacity of the tested battery packs, in which case energy storage devices can receive it.

[0056] In addition, the power battery 100 also needs to supply power to the auxiliary system (i.e., the auxiliary load). During the self-load test, the auxiliary system is also powered by the battery pack under test, consuming the discharge capacity of the battery pack under test. Unlike the non-battery pack under test and the energy storage device, the power consumed by the auxiliary load is determined by the auxiliary load itself and requires continuous power from the battery pack under test.

[0057] This invention provides an embodiment for self-load testing of the power battery 100 in a pure electric vehicle. It allows energy exchange between power batteries via the vehicle's DC bus, enabling self-load testing without the need for an external load to transfer energy. Specifically, during the test, energy from one battery pack 110 is directly transferred to other battery packs 110 via the vehicle's DC bus, thereby reducing energy consumption. To avoid the battery packs 110 being fully charged during testing, an energy storage device 200 is added. This device stores excess energy for a short period, enabling energy collection and reuse, further reducing energy waste.

[0058] Based on the above embodiments, optionally, the test conditions include: locomotive occupancy, completion of power battery deployment, establishment of bus voltage, and normal operation of auxiliary systems. Locomotive occupancy means the locomotive is in a state capable of performing self-load testing and energy exchange; otherwise, the locomotive cannot perform self-load testing and energy exchange. Completion of power battery deployment means the power battery 100 is installed on the locomotive and the wiring is complete. Establishment of bus voltage means the power battery 100 is connected to the locomotive's DC bus, and there is a stable voltage on the locomotive's DC bus. Normal operation of auxiliary systems means the auxiliary systems have started up completely and are fault-free.

[0059] Figure 3 This is a flowchart illustrating another method for self-load testing and energy exchange control of a pure power battery locomotive provided in an embodiment of the present invention. See also... Figure 3 Based on the above embodiments, optionally, the step of determining the test conditions specifically includes the following steps:

[0060] S210: Determine if the locomotive is occupied; if so, proceed to S220; otherwise, continue with S210.

[0061] S220, the busbar is engaged, and the energy storage device discharges;

[0062] Specifically, the system controls the power battery and energy storage device to be connected to the locomotive's DC bus, and controls the energy storage device to discharge.

[0063] S230. Determine whether the capacity of the energy storage device is less than the minimum capacity threshold; if yes, proceed to S240; otherwise, continue to S230.

[0064] S240: Control the energy storage device to switch to neither charging nor discharging, and control the power battery to switch to discharging;

[0065] S250: Determine if the bus voltage has been established; if yes, proceed to S260; otherwise, continue with S250.

[0066] The S260 and auxiliary systems are powered by the locomotive's DC bus and are operating normally.

[0067] In this embodiment of the invention, the test conditions are determined through steps S210-S260. Only after these test conditions are met can the locomotive perform self-load testing and energy exchange. This setup helps ensure the safe and efficient completion of the testing process. Specifically, the energy storage device's capacity is less than the minimum capacity threshold, which helps absorb excess energy from the tested battery pack during the test, avoiding energy waste. Furthermore, the discharge of the power battery facilitates the establishment of the bus voltage on the locomotive's DC bus, thereby ensuring the auxiliary system starts operating after normal power supply.

[0068] See also Figure 3 Optionally, based on the above embodiments, after step S260, the method further includes:

[0069] S270. Enter the test interface through the human-computer interaction interface;

[0070] S280: Determine if the locomotive is stationary; if yes, proceed to S290; otherwise, exit the test.

[0071] S290. After selecting the battery pack to be tested, control the battery pack to be tested to activate the test.

[0072] Controlling the self-load test through a human-machine interface (HMI) enhances its intelligence and safety. This HMI can be displayed on a monitor located in the locomotive's cab. The monitor communicates with the power battery, controller, and / or charging / discharging device and is powered by the locomotive's DC bus. Determining whether the locomotive is stationary ensures that the self-load test is performed while the locomotive is stationary, further guaranteeing test safety.

[0073] See also Figure 3 Based on the above embodiments, optionally, after S290, there is a specific energy exchange step, which specifically includes:

[0074] S2A0, non-tested battery pack recharger;

[0075] Specifically, the battery pack under test charges the non-tested battery pack that is in charging mode through the locomotive's DC bus;

[0076] S2B0: Determine if the SOC of the non-tested battery pack is greater than the full charge setting value; if yes, execute S2C0; otherwise, continue executing S2B0.

[0077] S2C0, energy storage device switching charge;

[0078] Specifically, non-tested battery packs are no longer charged, while tested battery packs charge the energy storage devices in charging mode via the locomotive's DC bus.

[0079] S2D0: Determine if the capacity of the energy storage device is greater than the maximum capacity threshold. If so, proceed with the test; otherwise, continue executing S2D0.

[0080] The tested battery pack continuously supplies power to the auxiliary system through the locomotive's DC bus.

[0081] Based on the above embodiments, optionally, after exiting the test, the following steps are also included:

[0082] The energy storage device supplies power to the auxiliary system and traction system through the locomotive's DC bus;

[0083] If the energy storage device is exhausted, the power battery will supply power to the auxiliary system and traction system through the locomotive's DC bus.

[0084] In this embodiment of the invention, after the test is completed, the energy storage device supplies power to the auxiliary system and the traction system, which can make full use of the electrical energy stored in the energy storage device during the self-load test, thereby realizing the rational use of electrical energy.

[0085] In the above embodiments, during and after the self-load test of the pure power battery locomotive, the energy exchange between the tested battery pack, energy storage device, and auxiliary load (i.e., auxiliary system) of the non-tested battery pack takes various forms. The following describes these forms in conjunction with... Figures 4-7 Please provide a detailed explanation.

[0086] Figure 4 This is a schematic diagram illustrating energy exchange when the SOC of a non-tested power battery pack is less than or equal to the full charge setting value, as provided in an embodiment of the present invention. (See also...) Figure 4 In one embodiment, after the bus voltage of the locomotive's DC bus is established, the energy storage device has no energy, and the power batteries (including the tested battery pack and the non-tested battery pack) provide power to the auxiliary load. During the self-load test, if the SOC of the non-tested power battery pack is less than or equal to the full charge setting value, the tested battery pack is in discharge mode, and the non-tested battery pack is in charging mode. The energy storage device is neither charged nor discharged and is disconnected from the locomotive's DC bus. The tested battery pack supplies power to the locomotive's DC bus, charges the non-tested battery pack, and supplies power to the auxiliary load. This energy exchange method is the preferred method used in the testing process.

[0087] Figure 5 This is a schematic diagram illustrating energy exchange when the SOC of a non-tested power battery pack exceeds the full charge setting value, as provided in an embodiment of the present invention. (See also...) Figure 5 In another embodiment, during the test, if the SOC of the non-tested power battery pack is greater than the full charge setting value, the non-tested battery pack can no longer absorb the electrical energy of the tested battery pack, and the excess electrical energy of the tested battery pack is absorbed by the energy storage device.

[0088] Figure 6This is a schematic diagram illustrating energy exchange when the SOC of a non-tested battery pack is greater than the full charge setting value, and the energy storage of the energy storage device is greater than the maximum capacity threshold, as provided in an embodiment of the present invention. See also... Figure 6 In another embodiment, after exiting the test, if the SOC of the non-tested battery pack is greater than the full charge setting value and the energy storage of the energy storage device is greater than the maximum capacity threshold, the energy storage device shall preferentially supply energy to the auxiliary load to consume the energy absorbed by the energy storage device during the test.

[0089] Figure 7 This is a schematic diagram illustrating energy exchange when the stored energy in an energy storage device is less than a minimum capacity threshold, as provided in an embodiment of the present invention. See also... Figure 7 In another embodiment, after exiting the test, if the energy stored in the energy storage device is less than the minimum capacity threshold, the energy storage device will be depleted. Then, the power battery (including the tested battery pack and the non-tested battery pack) will take over the locomotive DC bus, and the tested battery pack and the non-tested battery pack will simultaneously supply energy to the auxiliary load.

[0090] Based on the above embodiments, optionally, when controlling the activated test of the battery pack under test, charging the non-tested battery pack and energy storage device in charging mode through the locomotive DC bus, and supplying power to the auxiliary system, the method further includes: dynamically adjusting the discharge power of the battery pack under test and the charging power of the non-tested battery pack and energy storage device according to the current test level. The current test level can be determined by the locomotive handle position; a higher locomotive handle position results in a higher discharge power.

[0091] In another embodiment, optionally, taking a locomotive with two battery packs as an example, battery pack 1 is designated as the battery pack under test, and battery pack 2 is not the battery pack under test. After the bus voltage is established, battery packs 1 and 2 provide the bus voltage to jointly power the auxiliary load. With the locomotive stationary, battery pack 1 is selected for testing via the locomotive's human-machine interface. After the test begins, battery pack 1 remains in a continuous discharge state, battery pack 2 switches to a charging state, and the energy storage device remains in a neither-charging-nor-discharging state. The discharge power of battery pack 1 corresponds to the locomotive handle level; the higher the locomotive handle level, the greater the discharge power of battery pack 1. When the SOC of battery pack 2 exceeds the full charge setting (e.g., 90%), it enters a power-limited charging mode. At this time, the energy storage device's operating state switches from the neither-charging-nor-discharging state to the charging state. Besides the power used by battery pack 1 to charge battery pack 2 and power the auxiliary system, any excess energy is absorbed and stored by the energy storage device. When the energy storage device is fully charged, the test automatically ends.

[0092] After exiting the test, the energy storage device switches to a discharging state, while battery pack 1 is in a charging state, charged by the energy storage device and simultaneously supplying energy to the auxiliary load. If the energy is insufficient to charge battery pack 1 and supply energy to the auxiliary load, battery pack 2 switches to a discharging state to replenish the system's energy. If the charge difference between battery pack 1 and battery pack 2 is too large, the charge balance is gradually achieved by discharging the high-SOC battery pack more and the low-SOC battery pack less.

[0093] This invention clarifies the self-load testing conditions and principles for pure electric battery locomotives. By testing two battery packs separately, load capacity testing can be performed on the battery packs without removing them from the vehicle after maintenance or component replacement, reducing the cost of removing the battery packs from the vehicle for testing battery capacity. Simultaneously, through energy exchange between multiple battery packs, energy is saved while testing battery discharge capacity, achieving non-consumptive energy transfer. By adding an onboard energy storage device, load testing can be performed even when the battery pack has a high charge level, solving the problem of high SOC power-limited charging of the battery pack.

[0094] This invention also provides a self-load test and energy exchange control system for a pure power battery locomotive. The system includes a controller, an energy storage device connected to the locomotive's DC bus, a power battery, and an auxiliary system; wherein the power battery includes at least two battery packs.

[0095] The controller executes the self-load test and energy exchange control method for pure power battery locomotives provided in any embodiment of the present invention, which has corresponding beneficial effects.

[0096] Based on the above embodiments, optionally, the power battery device adopts a fuel cell, and the power battery body is composed of multiple cells connected in series and parallel.

[0097] Based on the above embodiments, optionally, the power battery is equipped with an external thermal protection system and a fire extinguishing device to form a complete battery device.

[0098] This invention provides a pure power battery locomotive, which includes the self-load testing and energy exchange control system for pure power battery locomotives as provided in any embodiment of this invention, and has corresponding beneficial effects.

[0099] Based on the above embodiments, optionally, the number of battery packs in a pure electric vehicle can be flexibly adjusted according to the power level. For example, a pure electric vehicle may be powered by a combination of two to four battery packs.

[0100] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0101] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A method for self-load testing and energy exchange control of a pure power battery locomotive, characterized in that, The pure power battery locomotive includes an energy storage device, a power battery, and an auxiliary system connected to the locomotive's DC bus; wherein the power battery includes at least two battery packs; the self-load testing and energy exchange control method for the pure power battery locomotive includes: At least two sets of battery packs are identified as the battery pack under test, and the remaining battery packs are not the battery packs under test. The tested battery pack is controlled to be in discharge mode, at least one group of non-tested battery packs is in charging mode, and the energy storage device is in charging mode. The tested battery pack, the non-tested battery pack in charging mode, and the energy storage device are all connected to the locomotive DC bus. If the test conditions are met, the test is activated by controlling the battery pack under test. The non-tested battery pack and the energy storage device, which are in charging mode, are charged through the locomotive DC bus, and the auxiliary system is powered.

2. The self-load testing and energy exchange control method for pure power battery locomotives according to claim 1, characterized in that, The test conditions include: locomotive occupancy, power battery commissioning completed, bus voltage established, and the auxiliary system operating normally.

3. The self-load testing and energy exchange control method for pure power battery locomotives according to claim 2, characterized in that, The method for determining the test conditions specifically includes: Determine if the locomotive is occupied; If so, then control the power battery and the energy storage device to be connected to the locomotive DC bus, and control the energy storage device to discharge; Determine whether the capacity of the energy storage device is less than the minimum capacity threshold; If so, the energy storage device is controlled to switch to a state of neither charging nor discharging, and the power battery is controlled to switch to discharging. Determine if the bus voltage has been established; If so, the auxiliary system is powered by the locomotive's DC bus and operates normally.

4. The self-load testing and energy exchange control method for pure power battery locomotives according to claim 1, characterized in that, Before controlling the activation test of the battery pack under test, the following is also included: Access the test interface through the human-computer interaction interface; Determine if the locomotive is stationary; if so, execute the step of controlling the activated test of the battery pack under test; otherwise, exit the test.

5. The self-load testing and energy exchange control method for pure power battery locomotives according to claim 1, characterized in that, The activation test of the battery pack under test includes charging the non-tested battery pack and the energy storage device in charging mode via the locomotive DC bus, and supplying power to the auxiliary system, specifically including: The battery pack under test charges the non-battery pack that is in charging mode through the locomotive DC bus. If the SOC of the non-tested battery pack is greater than the full charge setting value, then the non-tested battery pack will no longer be charged, and the tested battery pack will charge the energy storage device in charging mode through the DC bus. If the capacity of the energy storage device is greater than the maximum capacity threshold, the test is terminated. The battery pack under test continuously supplies power to the auxiliary system through the locomotive's DC bus.

6. The self-load testing and energy exchange control method for pure power battery locomotives according to claim 1, characterized in that, When controlling the activation test of the battery pack under test, charging the non-tested battery pack and the energy storage device in charging mode through the locomotive DC bus, and supplying power to the auxiliary system, the method further includes: The discharge power of the battery pack under test, as well as the charging power of the non-tested battery pack and the energy storage device, are dynamically adjusted according to the current test level.

7. The self-load test and energy exchange control method for pure power battery locomotives according to claim 1, characterized in that, After exiting the test, it also includes: The energy storage device supplies power to the auxiliary system and traction system through the locomotive DC bus; If the energy storage device is exhausted, the power battery will supply power to the auxiliary system and the traction system through the locomotive DC bus.

8. A self-load testing and energy exchange control system for a pure power battery locomotive, characterized in that, It includes a controller, an energy storage device connected to the locomotive's DC bus, a power battery, and an auxiliary system; wherein the power battery includes at least two battery packs; The controller performs the self-load test and energy exchange control method for pure power battery locomotives as described in any one of claims 1-7.

9. A pure battery-powered locomotive, characterized in that, This includes the self-load test and energy exchange control system for pure power battery locomotives as described in claim 8.

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