Energy storage valve sub-module testing method, apparatus and system, and computer device

Abstract

An energy storage valve sub-module testing method, apparatus and system, a computer device, a storage medium, and a computer program product. The method comprises: using an auxiliary test sub-module and a test object sub-module to build a mutual-testing architecture, and using the auxiliary test sub-module to charge the test object sub-module (step 102); obtaining charging state parameters of the test object sub-module in the charging process (step 104); and performing analysis to obtain the operating state of the test object sub-module (step 106).

Description

Energy storage valve submodule testing method, device, system and computer equipment

[0001] Related applications

[0002] This application claims priority to Chinese patent application number 2023107799531, filed on June 28, 2023, entitled “Energy Storage Valve Submodule Testing Method, Device, System and Computer Equipment,” the entire text of which is hereby incorporated by reference. Technical Field

[0003] The present application relates to the field of energy storage technology, and in particular to a method, apparatus, system, computer equipment, storage medium, and computer program product for testing an energy storage valve submodule. Background Art

[0004] Energy storage provides frequency and peak regulation across all aspects of power generation, transmission, distribution, and consumption, stabilizing grid frequency, alleviating grid congestion, and increasing the flexibility of power generation and consumption. Cascaded energy storage systems, with their modular design, high capacity utilization, high conversion efficiency, fast dynamic response, low harmonic content, and stable system operation, have become a research hotspot and hold broad application prospects.

[0005] The core component of a cascaded energy storage system is the energy storage valve submodule, which integrates the power module and battery module. The reliable operation of the energy storage valve submodule is crucial for the high reliability of the energy storage system and, ultimately, the power system. However, in related technologies, the operational reliability of the energy storage valve submodule is relatively low.

[0006] Application Contents

[0007] Based on this, it is necessary to provide a method, device, system, computer equipment, storage medium and computer program product for testing an energy storage valve submodule.

[0008] A method for testing an energy storage valve submodule includes: controlling a companion test submodule to perform direct current charging on a sample submodule, wherein the sample submodule includes a first power module and a first energy storage module connected to each other, and the companion test submodule includes a second power module and a second energy storage module connected to each other, and the high-voltage end of the first power module is connected to the high-voltage end of the second power module, and the low-voltage end of the first power module is connected to the low-voltage end of the second power module; obtaining charging state parameters of the sample submodule during the charging process; and determining the operating state of the sample submodule based on the charging state parameters.

[0009] The above solution uses a test submodule and a test product submodule to build a parallel-drag architecture. The test submodule is charged by the test submodule, and the charge state parameters of the test submodule are obtained during the charging process, thereby analyzing the operating status of the test submodule. This solution can simulate the actual operating conditions of the energy storage valve submodule, conduct operational testing on the energy storage valve submodule before it is put into use, reduce the probability of a faulty energy storage valve submodule being put into the energy storage system, and improve the operational reliability of the energy storage valve submodule.

[0010] In some embodiments, controlling the accompanying test submodule to perform DC charging on the sample submodule includes: when the voltage difference between the accompanying test submodule and the sample submodule is greater than a first preset threshold, controlling the accompanying test submodule to charge the sample submodule in a forward mode; when the voltage difference between the accompanying test submodule and the sample submodule is less than a second preset threshold, controlling the accompanying test submodule to charge the sample submodule in a reverse mode; wherein the first preset threshold is greater than or equal to the second preset threshold.

[0011] In the above scheme, when the voltage of the accompanying test submodule is greater than the voltage of the test submodule, or the voltage of the accompanying test submodule is less than the voltage of the test submodule, the test submodule can be charged by the accompanying test submodule, thereby improving the charging test reliability of the test submodule.

[0012] In some embodiments, controlling the companion test submodule to charge the sample submodule in forward mode includes: controlling the sample submodule to enter a charging mode, and controlling the power switching devices of the companion test submodule to be turned on in rotation, so as to charge the sample submodule in forward mode through the second energy storage module.

[0013] The above solution controls the alternating conduction of the power switch devices of the accompanying test sub-module, thereby maintaining a continuous and relatively stable DC current to charge the test sub-module.

[0014] In some embodiments, the high-voltage end of the first power module is connected to the high-voltage end of the second power module through an inductor, and the accompanying test sub-module is controlled to charge the sample sub-module in reverse mode, including: controlling the accompanying test sub-module to charge the inductor; controlling the sample sub-module to enter a charging mode, and controlling the power switching devices of the accompanying test sub-module to be turned on in rotation, so as to charge the sample sub-module in reverse mode through the electric energy stored in the inductor and the second energy storage module.

[0015] In the above scheme, when the voltage of the companion sub-module is lower than the voltage of the sample sub-module, the sample sub-module is first controlled to charge the inductor, and then the electrical energy of the inductor and the electrical energy stored in the second energy storage module are transmitted to the sample sub-module, thereby achieving a boosting effect and maintaining a continuous and relatively stable DC current to charge the sample sub-module.

[0016] In some embodiments, controlling the accompanying test submodule to DC charge the sample submodule includes: inputting a switch control signal with any duty cycle and frequency to the sample submodule, and inputting a switch control signal with a fixed frequency to the accompanying test submodule to control the accompanying test submodule to DC charge the sample submodule.

[0017] In the above solution, the test submodule can perform charging tests with switch control signals of arbitrary duty cycle and frequency, thereby completing charging tests from 0 to the highest operating frequency and arbitrary duty cycle, enriching the test scenarios of the test submodule.

[0018] In some embodiments, the energy storage valve submodule testing method further includes: adjusting the duty cycle of the switch control signal of the accompanying test submodule according to the current sampling value of the first end of the test submodule and the preset reference current.

[0019] In the above scheme, when the companion test submodule charges the submodule by switching on and off with a fixed-frequency switch control signal, it can also adjust the duty cycle of the switch control signal in real time based on the actual feedback current sampling value, thereby improving the test reliability of the test submodule.

[0020] In some embodiments, the charging state parameter includes at least one of a current parameter, a voltage parameter, and a temperature parameter.

[0021] In the above scheme, the charging state parameter includes at least one of the current parameter, the voltage parameter, and the temperature parameter, so that the corresponding test content of the test submodule can be completed according to at least one of the current parameter, the voltage parameter, and the temperature parameter, which can effectively enrich the test content.

[0022] In some embodiments, determining the operating state of the sample submodule according to the charging state parameter includes: determining the voltage stress state and the current stress state of the sample submodule during the charging process according to the voltage parameter and the current parameter.

[0023] The above scheme can implement voltage stress testing based on the voltage parameters of the test submodule during the charging process, and implement current stress testing based on the current parameters, thereby determining the voltage stress state and current stress state of the energy storage valve submodule, and improving the operational reliability of the test submodule when it is put into use.

[0024] In some embodiments, the current fluctuation state and the temperature rise state of the test submodule are determined based on the current parameters and the temperature parameters.

[0025] The above scheme can implement current fluctuation state testing based on the current parameters of the test submodule during the charging process, and implement temperature rise testing through temperature parameters, thereby determining the current fluctuation state and temperature rise state of the energy storage valve submodule, and improving the operational reliability of the test submodule when it is put into use.

[0026] In some embodiments, the energy storage valve submodule testing method further includes: controlling the accompanying test submodule to supplement power when the accompanying test submodule has a need for supplement power.

[0027] The above solution can provide power to the accompanying submodule when it needs power replenishment, whether before or during the test, thereby effectively improving the test time of the energy storage valve submodule.

[0028] In some embodiments, the energy storage valve submodule testing method further includes: controlling the test submodule to discharge the companion test submodule; obtaining discharge state parameters of the test submodule during the discharge process; and determining the operating state of the test submodule based on the discharge state parameters.

[0029] The above solution can also realize the discharge test of the test submodule by controlling the test submodule to charge the companion test submodule, thereby further improving the operational reliability of the test submodule when it is put into use.

[0030] A device for testing an energy storage valve submodule includes: a charging control module, used to control a companion test submodule to perform DC charging on a sample submodule, wherein the sample submodule includes a first power module and a first energy storage module connected to each other, and the companion test submodule includes a second power module and a second energy storage module connected to each other, the high-voltage end of the first power module is connected to the high-voltage end of the second power module, and the low-voltage end of the first power module is connected to the low-voltage end of the second power module; a parameter acquisition module, used to obtain charging state parameters of the sample submodule during the charging process; the charging state parameters are used to determine the operating state of the sample submodule.

[0031] A computer device includes a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of the above-mentioned energy storage valve submodule testing method when executing the computer program.

[0032] A computer-readable storage medium stores a computer program, which, when executed by a processor, implements the steps of the above-mentioned energy storage valve submodule testing method.

[0033] A computer program product includes a computer program, which implements the steps of the above-mentioned energy storage valve submodule testing method when executed by a processor.

[0034] A storage valve submodule testing system includes a test submodule, a companion test submodule and a processor. The test submodule includes a connected first power module and a first energy storage module. The companion test submodule includes a connected second power module and a second energy storage module. The high-voltage end of the first power module is connected to the high-voltage end of the second power module, the low-voltage end of the first power module is connected to the low-voltage end of the second power module, and the control end of the first power module and the control end of the second power module are respectively connected to the processor. The processor is used to test the test submodule according to the above-mentioned energy storage valve submodule testing method.

[0035] The above solution uses a test submodule and a test product submodule to build a parallel-drag architecture. The test submodule is charged by the test submodule, and the charge state parameters of the test submodule are obtained during the charging process, thereby analyzing the operating status of the test submodule. This solution can simulate the actual operating conditions of the energy storage valve submodule, conduct operational testing on the energy storage valve submodule before it is put into use, reduce the probability of a faulty energy storage valve submodule being put into the energy storage system, and improve the operational reliability of the energy storage valve submodule.

[0036] In some embodiments, the energy storage valve submodule testing system further includes an inductor, and the high voltage end of the first power module is connected to the high voltage end of the second power module through the inductor.

[0037] In the above solution, an inductor is provided between the high-voltage terminals of the first power module and the second power module, so that when the voltage of the accompanying test submodule is low, energy can still be stored through the inductor to charge the sample submodule, thereby improving the charging reliability of the accompanying test submodule for charging the sample submodule.

[0038] In some embodiments, the energy storage valve submodule testing system further includes an energy replenishment circuit connected to the second energy storage module.

[0039] In the above scheme, an energy replenishment circuit is also provided in the energy storage valve submodule test system. The energy replenishment circuit replenishes power for the second energy storage module of the accompanying test submodule, which can effectively improve the endurance of the accompanying test submodule and enable the energy storage valve submodule to perform long-term operation tests.

[0040] In some embodiments, the energy compensation circuit includes a switching device and a current source, and the current source is connected to the second energy storage module through the switching device.

[0041] In the above solution, the energy replenishment circuit specifically includes a switch device and a current source connected in series, has a simple structure, and can effectively save the volume and circuit cost of the energy storage valve submodule test system.

[0042] In some embodiments, the first power module includes a first power unit and a first capacitor connected in parallel, the high voltage end of the first power unit is connected to the high voltage end of the second power module, and the low voltage end of the first power unit is connected to the low voltage end of the second power module.

[0043] And / or, in some embodiments, the second power module includes a second power unit and a second capacitor connected in parallel, the high voltage end of the second power unit is connected to the high voltage end of the first power module, and the low voltage end of the second power unit is connected to the low voltage end of the first power module.

[0044] In the above scheme, the first power module and the second power module both include power cells and capacitors. By constructing this test architecture, it is possible to test an energy storage valve submodule of the type in which the power module includes a power cell and a capacitor, thereby improving the operational reliability of this type of energy storage valve submodule.

[0045] In some embodiments, the first power module includes a full-bridge power module or a half-bridge power module, and the second power module includes a full-bridge power module or a half-bridge power module.

[0046] In the above scheme, the test submodule and the accompanying test submodule can be half-bridge structure and full-bridge structure respectively, which can realize the pair-drag test of the energy storage valve submodule under the half-bridge structure, or the pair-drag test of the energy storage valve submodule under the full-bridge structure, and has a wide range of applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0048] FIG1 is a schematic flow chart of a method for testing an energy storage valve submodule in some embodiments of the present application;

[0049] FIG2 is a schematic diagram of the structure of the energy storage valve submodule test system in some embodiments of the present application;

[0050] FIG3 is a flow chart of a method for testing an energy storage valve submodule in some other embodiments of the present application;

[0051] FIG4 is a flow chart of a method for testing an energy storage valve submodule in some other embodiments of the present application;

[0052] FIG5 is a schematic diagram of an equivalent circuit structure of an energy storage valve submodule test system in some embodiments of the present application;

[0053] FIG6 is a schematic diagram of the structure of the energy storage valve submodule test system in some other embodiments of the present application;

[0054] FIG7 is a schematic diagram of an inductor current waveform during forward mode charging in some embodiments of the present application;

[0055] FIG8 is a schematic diagram of an inductor current waveform during reverse mode charging in some embodiments of the present application;

[0056] FIG9 is a schematic diagram of switch control signal injection in some embodiments of the present application;

[0057] FIG10 is a flow chart of a method for testing an energy storage valve submodule in some further embodiments of the present application;

[0058] FIG11 is a flow chart of a method for testing an energy storage valve submodule in some other embodiments of the present application;

[0059] FIG12 is a schematic structural diagram of an energy storage valve submodule testing device in some embodiments of the present application;

[0060] FIG13 is a schematic structural diagram of an energy storage valve submodule testing device in other embodiments of the present application;

[0061] FIG14 is a schematic structural diagram of an energy storage valve submodule testing device in some other embodiments of the present application;

[0062] FIG15 is a schematic structural diagram of an energy storage valve submodule testing device in some further embodiments of the present application;

[0063] FIG16 is a schematic diagram of the internal structure of a computer device in some embodiments of the present application;

[0064] FIG17 is a schematic diagram of the structure of the energy storage valve submodule testing system in some other embodiments of the present application;

[0065] FIG18 is a schematic structural diagram of an energy storage valve submodule testing system in some further embodiments of the present application;

[0066] FIG19 is a schematic structural diagram of an energy storage valve submodule testing system in some other embodiments of the present application;

[0067] FIG20 is a schematic diagram of the structure of the energy storage valve submodule testing system in some further embodiments of the present application. DETAILED DESCRIPTION

[0068] The following will describe in detail the embodiments of the technical solution of the present application in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only used as examples and cannot be used to limit the scope of protection of the present application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of the present application; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "including" and "having" in the specification and claims of the present application and the above-mentioned description of the drawings and any variations thereof are intended to cover non-exclusive inclusions.

[0069] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0070] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0071] In the description of the embodiments of the present application, unless otherwise clearly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be internal communication between two elements or an interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0072] Currently, judging by market developments, high-voltage direct-mounted energy storage is gradually gaining development and application due to its highly modular structure, which can meet the demands of high efficiency, high reliability, economy, and safety. The core component of a high-voltage direct-mounted energy storage system is the energy storage valve submodule. Each energy storage valve submodule includes a power section and an energy storage section. Multiple energy storage valve submodules are connected to form an energy storage system. Typically, energy storage valve submodules are connected in a cascade manner to form a cascaded energy storage system. Therefore, the reliable operation of the energy storage valve submodule directly affects the operation of the energy storage system, making it particularly important to improve the operational reliability of the energy storage valve submodule.

[0073] In addition to operational failures during use due to grid failures, improper operation, or component aging, the energy storage valve submodule may also experience faults before being connected to the energy storage system. Therefore, to improve the operational reliability of the energy storage submodule and reduce the failure rate of the energy storage valve submodule when connected to the energy storage system, it is particularly important to test the energy storage valve submodule before connecting it to the energy storage system.

[0074] Based on the above considerations, the technical solution of the present application provides a method for testing an energy storage valve sub-module. When conducting the test, two energy storage valve sub-modules of the same type are selected, one of which is used as a companion test sub-module and the other as a test sub-module. The two energy storage valve sub-modules are connected to form a pair-drag architecture. The companion test sub-module is used to charge the test sub-module. During the charging process, the charging status parameters of the test sub-module are obtained, and finally the operating status of the test sub-module is determined based on the charging status parameters.

[0075] Through the above method, the actual operating conditions of the energy storage valve submodule can be simulated. Before the energy storage valve submodule is put into use, the energy storage valve submodule can be tested for operation to determine whether the energy storage valve submodule has failed, thereby reducing the probability of a failed energy storage valve submodule being put into the energy storage system and improving the operational reliability of the energy storage valve submodule.

[0076] Furthermore, during the test, the test submodule can discharge power to the companion submodule. Accordingly, the discharge state parameters of the test submodule are obtained and used to determine the operating state of the test submodule, thereby completing the discharge test of the test submodule. This can further reduce the probability of a faulty energy storage valve submodule being put into the energy storage system and further improve the operational reliability of the energy storage valve submodule.

[0077] The energy storage valve submodule provided in the present application is applied in an energy storage system. Specifically, the energy storage valve submodule is applied in an electrochemical energy storage system, that is, an energy storage system that stores, releases and manages energy through batteries. Furthermore, the type of electrochemical energy storage system is not unique, as long as it is an electrochemical energy storage system that needs to be built using an energy storage valve submodule. For example, in a more detailed embodiment, the electrochemical energy storage system includes a high-voltage direct-hung energy storage system. In order to facilitate understanding of the technical solution of the present application, the following embodiments can all be understood as the energy storage valve submodule being applied in a high-voltage direct-hung energy storage system.

[0078] Please refer to FIG. 1 , which shows a method for testing an energy storage valve submodule, including step 102 , step 104 and step 106 .

[0079] Step 102: Control the accompanying test submodule to perform DC charging on the sample submodule.

[0080] Specifically, the test submodule includes a connected first power module and a first energy storage module, and the accompanying test submodule includes a connected second power module and a second energy storage module. The high-voltage terminal of the first power module is connected to the high-voltage terminal of the second power module, and the low-voltage terminal of the first power module is connected to the low-voltage terminal of the second power module. The accompanying test submodule is the energy storage valve submodule used to provide charging energy or store and release energy for the energy storage valve submodule to be tested. The test submodule is the energy storage valve submodule to be tested, that is, the energy storage valve submodule to be tested.

[0081] Furthermore, in another embodiment, in order to improve the charging reliability when the companion test sub-module charges the sample sub-module, so that the companion test sub-module can still charge the sample sub-module when the voltage is low, or even lower than the voltage of the sample sub-module, refer to Figure 2, and connect the high-voltage end of the second power module of the companion test sub-module 204 (not shown) to the high-voltage end of the first power module of the sample sub-module 202 (not shown) through the inductor L.

[0082] It should be noted that in actual testing, the definitions of the test submodule and the accompanying test submodule in the paired-drag architecture constructed with two energy storage valve submodules are not unique. If both energy storage valve submodules need to be tested, either energy storage valve submodule can be used as the test submodule, and the other energy storage valve submodule can be used as the accompanying test submodule. After the test submodule is tested, it is used as the accompanying test submodule, and the previous accompanying test submodule is used as the test submodule, and the test of the other energy storage valve submodule is switched.

[0083] The energy storage valve submodule includes an energy storage module and a power module. During the actual test process, the processor only needs to send control signals to the second energy storage module and the second power module of the accompanying test submodule, and the first energy storage module and the first power module of the sample submodule, so that the electric energy stored in the second energy storage module of the accompanying test submodule is transmitted to the sample submodule to realize the charging of the sample submodule.

[0084] It is understood that the specific form of the processor is not limited. In one embodiment, the processor can be an additional component of the independent energy storage valve submodule, and can be an MCU (Microcontroller Unit), a CPU (Central Processing Unit), etc. In another embodiment, the processor can also be integrated into the control board of the energy storage valve submodule. There is no specific limitation and the selection can be based on actual needs.

[0085] Step 104: Obtain charging status parameters of the test submodule during the charging process.

[0086] Specifically, the charging state parameter is a parameter related to the charging state of the test submodule during the charging process. This can be a charging-related parameter applied to the test submodule during the test, or a parameter that changes with charging time during the test. There are no specific limitations and the selection can be based on actual needs.

[0087] It is understood that there is no single method for acquiring charging state parameters. These parameters can be acquired through detection by the test submodule's own detection device, with the processor and the test submodule exchanging information, or by providing an additional state parameter collector within the test submodule. The specific method is not limited and can be selected based on the actual type of charging state parameters. For example, in a more detailed embodiment, the processor can exchange information with the battery management system of the energy storage module to acquire temperature parameters, charging current parameters, and charging voltage parameters of the energy storage module, and use these parameters as charging state parameters.

[0088] Step 106: Determine the operating status of the test submodule according to the charging status parameter.

[0089] Specifically, after the processor obtains the charging status parameters, it analyzes them to determine the current operating status of the test submodule, that is, to determine whether the test submodule is operating normally. If the test submodule is determined to be operating normally, the test submodule can be put into use in the energy storage system as normal. If the test submodule is not operating normally, the operator is notified by outputting an alarm prompt message, etc., so that the operator can conduct timely maintenance.

[0090] It should be noted that the operating state of the test submodule is not unique. Depending on the type of charging state parameter obtained, the operating state obtained by the final analysis may also be different. For example, in a more detailed embodiment, the operating state may include states related to voltage, current, or temperature changes during the charging process.

[0091] It is understood that in one embodiment, when testing the energy storage valve submodule, the processor may also push operating status parameters to personnel, specifically through a display terminal or voice prompt, etc., which is not limited here. Personnel then analyze the displayed charging status parameters to ultimately determine the operating status of the test submodule and, therefore, whether the test submodule is suitable for use in the energy storage system.

[0092] The above solution uses a test submodule and a test product submodule to build a parallel-drag architecture. The test submodule is charged by the test submodule, and the charge state parameters of the test submodule are obtained during the charging process, thereby analyzing the operating status of the test submodule. This solution can simulate the actual operating conditions of the energy storage valve submodule, conduct operational testing on the energy storage valve submodule before it is put into use, reduce the probability of a faulty energy storage valve submodule being put into the energy storage system, and improve the operational reliability of the energy storage valve submodule.

[0093] Referring to FIG. 3 , in some embodiments, the energy storage valve submodule testing method further includes step 302 .

[0094] Step 302 : When the accompanying test submodule needs to be recharged, control the accompanying test submodule to recharge.

[0095] Specifically, recharging refers to replenishing electrical energy, i.e., charging the accompanying submodule. In the test method disclosed in the embodiments of this application, to simulate the various operating conditions of the test submodule as closely as possible, the accompanying submodule is required to charge the test submodule for a relatively long time. Consequently, the electrical energy stored in the accompanying submodule's energy storage module may be too low to meet the long-term charging requirements. Therefore, the solution of this embodiment requires controlling the accompanying submodule to recharge when the accompanying submodule requires recharging, thereby enabling long-term test operation.

[0096] It is understandable that there is not only one way to determine whether the accompanying test submodule needs to be recharged. In one embodiment, before the test begins, the staff may set a preset number of charging cycles. One number of cycles includes: the test submodule is correspondingly provided with multiple different switch control signals. If the test submodule completes a charging test with each of the set switch control signals, it is considered that the test for one number of cycles is completed. The processor can then determine whether the accompanying test submodule needs to be recharged based on the preset number of cycles and the current power of the accompanying test submodule. If the current power can meet the charging requirements of the preset number of cycles, there is no need to recharge. If the current power does not meet the charging requirements of the preset number of cycles, it is necessary to recharge the accompanying test submodule.

[0097] In another embodiment, during the actual test process, the remaining power of the current accompanying test sub-module can be detected in real time. When the remaining power does not meet the next charging requirement, it is considered that the accompanying test sub-module needs to be recharged, and then recharging is started for the accompanying test sub-module.

[0098] It should be pointed out that the method of recharging the accompanying test sub-module is not unique. In a more detailed embodiment, an external recharging device can be connected to the accompanying test sub-module to control the on and off of the power switching device of the accompanying test sub-module, and the external recharging device can be used to charge the accompanying test sub-module, thereby realizing the recharging operation.

[0099] In another embodiment, a power supply circuit may be built at the accompanying test submodule. During the actual test process, the power supply circuit may be turned on to supply power to the accompanying test submodule based on the remaining power of the accompanying test submodule.

[0100] The above solution can provide power to the accompanying submodule when it needs power replenishment, whether before or during the test, thereby effectively improving the test time of the energy storage valve submodule.

[0101] Referring to FIG. 4 , in some embodiments, step 102 includes step 402 and step 404 .

[0102] Step 402 : When the voltage difference between the accompanying test submodule and the sample submodule is greater than a first preset threshold, control the accompanying test submodule to charge the sample submodule in a forward mode.

[0103] Step 404 : When the voltage difference between the accompanying test submodule and the sample submodule is less than a second preset threshold, control the accompanying test submodule to charge the sample submodule in a reverse mode.

[0104] Specifically, the first preset threshold is greater than or equal to the second preset threshold. During the test process, the processor can obtain the voltage of the accompanying test submodule and the test product submodule in real time, and determine the charging mode required by the current test product submodule based on the voltage difference between the accompanying test submodule and the test product submodule, and then control the accompanying test submodule to charge the test product submodule in different operating states.

[0105] In the scheme of this embodiment, forward mode charging refers to the process in which, when the voltage of the accompanying test submodule differs significantly from the voltage of the test submodule, the electric energy is transferred from the higher voltage accompanying test submodule to the lower voltage test submodule to charge the test submodule. Reverse mode charging refers to the process in which, when the voltage of the accompanying test submodule is greater than the voltage of the test submodule, but the difference between the two is small, the electric energy is transferred from the higher voltage accompanying test submodule to the lower voltage test submodule to charge the test submodule (this process may become less than the voltage of the test submodule as the charging time increases); or, when the voltage of the accompanying test submodule is less than the low voltage of the test submodule, the electric energy is transferred from the lower voltage accompanying test submodule to the higher voltage test submodule to charge the test submodule.

[0106] It should be pointed out that the specific sizes of the first preset threshold and the second preset threshold are not unique. The two can be set to the same, for example, both are set to 0; or they can be set to different. For example, in a more detailed embodiment, the first preset threshold can be set to a voltage threshold greater than 0, and the second preset threshold can be set to a voltage threshold less than 0. The specific selection can be made based on actual needs.

[0107] Through the solution of this embodiment, the entire test system can achieve full energy operation, that is, no matter how much the voltage of the accompanying test submodule is, the accompanying test submodule can realize DC charging of the test product submodule.

[0108] In the above scheme, when the voltage of the accompanying test submodule is greater than the voltage of the test submodule, or the voltage of the accompanying test submodule is less than the voltage of the test submodule, the test submodule can be charged by the accompanying test submodule, thereby improving the charging test reliability of the test submodule.

[0109] In some embodiments, controlling the accompanying test submodule to charge the sample submodule in a forward mode includes: controlling the sample submodule to enter a charging mode, and controlling the power switching devices of the accompanying test submodule to be turned on in rotation, so as to charge the sample submodule in a forward mode through the energy storage module of the accompanying test submodule.

[0110] Specifically, taking the example of the accompanying test submodule not being connected to the energy compensation circuit and the inductor being connected between the accompanying test submodule and the sample submodule, the drag structure constructed by the accompanying test submodule and the sample submodule can be equivalent to that shown in Figure 5. Among them, u1 and u2 are the voltages of the sample submodule and the accompanying test submodule, r1 and r2 are the internal resistances of the sample submodule and the accompanying test submodule, and i L is the line resistance, L is the inductance, i L is the inductor current, d1 and d2 are the duty cycles of the switch control signals of the test submodule and the accompanying test submodule respectively. According to Kirchhoff's law, the current steady-state operating point satisfies: d2u2-(r1+r2+r l )i L =d1u1

[0111] Therefore, in the actual test process, by changing the duty cycle of the switch control signal of the test submodule and the accompanying test submodule, the d2u2-(r1+r2+r l )i L =d1u1, the electric energy output by the companion test submodule can be equivalently transmitted to the test submodule, thereby realizing the charging operation of the test submodule.

[0112] It should be pointed out that the method of controlling the test sub-module to enter the charging mode and controlling the power switching devices of the companion test sub-module to rotate and turn on is not unique. It varies depending on the different power module structures of the test sub-module and the companion test sub-module. In order to facilitate understanding of the technical solution of this application, the following explanation is given using a half-bridge power module as an example.

[0113] 6 , the test submodule includes a first power module 601 and a first energy storage module 602, while the companion submodule includes a second power module 603 and a second energy storage module 604. The structures of the first power module 601 and the second power module 603 can be the same or different, depending on actual needs.

[0114] FIG6 takes the case where the first power module 601 and the second power module 603 have the same structure as an example. The first power module 601 includes a power unit and a first capacitor C1. Furthermore, the power unit is a half-bridge structure, including a first power switch device T1 and a second power switch device T2. The common end of the first power switch device T1 and the second power switch device T2 serves as a high-voltage end. Correspondingly, the input end of the first power switch device T1 is connected to the input end of the second power switch device T2, a processor (not shown), and a first end of the inductor L. The output end of the first power switch device T1 is connected to the first end of the first capacitor C1 and the first end of the first energy storage module 602. The output end of the second power switch device T2 serves as a low-voltage end and is connected to the second power module 603. The output end of the second power switch device T2 is also connected to the second end of the first capacitor C1 and the second end of the first energy storage module 602. The control end of the first power switch device T1 and the control end of the second power switch device T2 are respectively connected to the processor (not shown).

[0115] If the first end of the first energy storage module 602 is a positive electrode and the second end of the first energy storage module 602 is a negative electrode, in actual operation, the processor outputs a switch control signal to control the first power switch device T1 to turn on, and the test submodule enters the charging mode. At this time, the processor outputs a switch control signal to control the two power switches of the accompanying test submodule to turn on in rotation. With reference to FIG7 , d2 represents the duty cycle of the switch control signal of the accompanying test submodule, and T2 represents the period of the switch control signal of the accompanying test submodule, that is, 1 / f, where f is the frequency. When the power switch device connected to the positive electrode of the second energy storage module 604 in the accompanying test submodule is turned on, the voltage applied to both ends of the inductor is positive, and the current flowing through the inductor increases. If the processor controls the power switch device connected to the negative electrode of the second energy storage module 604 in the accompanying test submodule to turn on, the voltage applied to both ends of the inductor is negative, and the current flowing through the inductor decreases. Because the inductor current cannot change suddenly, the current direction will not change in a short period of time. The current flowing through the inductor fluctuates around the preset reference current. At this time, a continuous and relatively stable DC current can be maintained to charge the test sub-module in the forward direction.

[0116] It can be understood that in the above-mentioned power unit, the specific types of the first power switching device T1 and the second power switching device T2 are not unique, and can be MOS (Metal-Oxide-Semiconductor) tubes or IGBTs (Insulated Gate Bipolar Transistors), etc., without specific limitation.

[0117] The above scheme controls the alternating conduction of the power switching devices of the test sub-module so that the current flowing through the inductor alternately increases and decreases. Since the inductor current cannot change suddenly, the current direction will not change in a short period of time, thereby maintaining a continuous and relatively stable DC current to charge the test sub-module.

[0118] In some embodiments, the high-voltage end of the first power module is connected to the high-voltage end of the second power module through an inductor, and the accompanying test sub-module is controlled to charge the sample sub-module in reverse mode, including: controlling the accompanying test sub-module to charge the inductor; controlling the sample sub-module to enter a charging mode, and controlling the power switching devices of the accompanying test sub-module to be turned on in rotation, so as to charge the sample sub-module in reverse mode through the electric energy stored in the inductor and the energy storage module of the accompanying test sub-module.

[0119] Specifically, in order to facilitate understanding of the technical solution of this embodiment, the following is also explained by setting an inductor between the accompanying test submodule and the test product submodule, and the power module includes a half-bridge power module. In the solution of this embodiment, when the voltage difference between the accompanying test submodule and the test product submodule is less than the second preset threshold value, the accompanying test submodule is first controlled to charge the inductor. Specifically, the processor first controls the second power switch device T2 connected to the negative pole of the first energy storage module 602 in the test product submodule to turn on, and at the same time controls the power switch device connected to the positive pole of the second energy storage module 604 in the accompanying test submodule to turn on. At this time, the electric energy of the accompanying test submodule is transmitted to the inductor for charging.

[0120] After this, the processor controls the test submodule to enter charging mode and controls the power switches of the companion submodule to alternately conduct. Specifically, the processor controls the first power switch T1 of the test submodule to conduct. The power input to the test submodule includes the power stored in the inductor and the power stored in the second energy storage module 604, thereby achieving a voltage boost effect and realizing reverse charging of the companion submodule to the test submodule.

[0121] Specifically, please refer to Figure 8, d1 represents the duty cycle of the switch control signal of the test submodule, T1 represents the period of the switch control signal of the test submodule, d2 represents the duty cycle of the switch control signal of the accompanying test submodule, and T2 represents the period of the switch control signal of the accompanying test submodule. When the frequency of the switch control signal of the test submodule is set too low, the first power switch device will be turned on for a long time, and accordingly, the time for charging the inductor is relatively short. In the process of the two power switch devices of the accompanying test submodule being turned on in rotation, the voltages at both ends of the inductor are negative, which will cause the current to continue to decrease for a long time. Therefore, in a more detailed embodiment, it is necessary to set a suitable frequency of the switch control signal to reduce the conduction time of the first power switch device, so that the current flowing through the inductor fluctuates around the preset reference current, thereby achieving continuous and stable reverse mode charging.

[0122] In the above scheme, when the voltage of the companion test sub-module is lower than the voltage of the sample sub-module, the sample sub-module is first controlled to charge the inductor, and then the electric energy of the inductor and the electric energy stored in the energy storage module of the companion test sub-module are transmitted to the sample sub-module, thereby achieving a boosting effect and maintaining a continuous and relatively stable DC current to charge the sample sub-module.

[0123] In some embodiments, controlling the accompanying test submodule to DC charge the sample submodule includes: inputting a switch control signal with any duty cycle and frequency to the sample submodule, and inputting a switch control signal with a fixed frequency to the accompanying test submodule to control the accompanying test submodule to DC charge the sample submodule.

[0124] Specifically, referring to FIG9 , the solution of this embodiment, during the test of the sample submodule, in order to obtain the charging state parameters of the sample submodule under various operating conditions and improve the test accuracy of the sample submodule, the accompanying test submodule and the sample submodule are modulated separately during the test process. When the sample submodule is controlled to start charging, a switch control signal with any duty cycle (d1) and any frequency (f) can be input to the sample submodule, while the accompanying test submodule controls the operation of its second power module with a higher fixed frequency switch control signal, thereby charging the sample submodule.

[0125] It should be noted that the switch control signal is not limited to a single type. In a more detailed embodiment, the switch control signal includes a PWM (Pulse Width Modulation) signal. The processor is provided with a PWM controller or the processor has a PWM modulation function. During the actual test process, the PWM controller generates a switch control signal with any frequency and any duty cycle according to the test requirements, controls the operation of the first power module of the test submodule, and completes DC charging.

[0126] More specifically, in one embodiment, the frequency and duty cycle of the switch control signal required by the test submodule can be pre-set. For example, if the switch control signal frequency is set to 10 Hz, 20 Hz, and so on, up to 1000 Hz, then during the actual test process, the test submodule will need to be controlled to operate at frequencies of 10 Hz, 20 Hz, and so on, up to 1000 Hz, to complete the charging test at each set frequency.

[0127] In the above solution, the test submodule can perform charging tests with switch control signals of arbitrary duty cycle and frequency, thereby completing charging tests from 0 to the highest operating frequency and arbitrary duty cycle, enriching the test scenarios of the test submodule.

[0128] In some embodiments, the energy storage valve submodule testing method further includes: adjusting the duty cycle of the switch control signal of the accompanying test submodule according to the current sampling value of the first end of the test submodule and the preset reference current.

[0129] Specifically, referring to FIG9 , in this embodiment, the duty cycle of the switch control signal of the companion submodule varies with changes in the load current fed back by the test submodule. The specific adjustment method is PI (proportional integral) regulation. The processor has a PI regulation function or is provided with a PI regulator. The processor obtains the current value between the first terminal of the test submodule and the inductor, that is, the current sampling value (iL). A preset reference current (I_ref) and the current sampling value generate a difference, which is input to the PI regulator for regulation. The PI regulator can make the input value track the reference value. Specifically, the PI regulator minimizes the difference between the preset reference current and the current sampling value, that is, the current sampling value always tracks the preset reference current value, achieving a stable DC charging current. The duty cycle value obtained by the PI regulator output when the difference between the preset reference current and the current sampling value is very small is used as the duty cycle of the switch control signal of the companion submodule and input into the PWM controller to generate a modulation wave to achieve control of the companion submodule.

[0130] It should be pointed out that the size of the preset reference current is not unique. According to actual test requirements, the preset reference current can be set to any size, such as 0 to the maximum operating current of the test submodule, so as to achieve full testing of the test submodule from 0 to the maximum operating current.

[0131] In the above scheme, when the companion test submodule charges the submodule by switching on and off with a fixed-frequency switch control signal, it can also adjust the duty cycle of the switch control signal in real time based on the actual feedback current sampling value, thereby improving the test reliability of the test submodule.

[0132] In some embodiments, the charging state parameter includes at least one of a current parameter, a voltage parameter, and a temperature parameter. Specifically, the current parameter is the current value of the test submodule in the charging operation state; the voltage parameter is the voltage value of the test submodule in the charging operation state; and the temperature parameter is the temperature value of the battery in the energy storage module in the charging operation state of the test submodule.

[0133] In the solution of this embodiment, during the process of the test submodule undergoing the towing test and being charged by the companion test submodule, at least one of the current parameters, voltage parameters, and temperature parameters can be obtained, thereby analyzing the operating status of the test submodule based on one or more of the current parameters, voltage parameters, and temperature parameters to determine whether the test submodule can be put into use in the energy storage system.

[0134] In the above scheme, the charging state parameter includes at least one of the current parameter, the voltage parameter, and the temperature parameter, so that the corresponding test content of the test submodule can be completed according to at least one of the current parameter, the voltage parameter, and the temperature parameter, which can effectively enrich the test content.

[0135] 10 , in some embodiments, step 106 includes step 1061. Step 1061: determining the voltage stress state and the current stress state of the test submodule during the charging process according to the voltage parameters and the current parameters.

[0136] Specifically, voltage stress is the ratio of the voltage in an application to the component's specification value, or the ratio of the operating voltage to the rated voltage. Current stress is the ratio of the current in an application to the component's specification value, or the ratio of the operating current to the rated current. This embodiment analyzes the voltage and current stress states of the test submodules using real-time acquired voltage and current parameters, i.e., real-time voltage and current stress.

[0137] It should be noted that the specific forms of the voltage stress state and the current stress state are not limited. In one embodiment, the voltage stress state can be a specific voltage stress value, or an analysis result of whether the voltage stress is normal, etc., without specific limitation. Similarly, the current stress state can be a specific current stress value, or an analysis result of whether the current stress is normal, etc., without specific limitation.

[0138] In a more detailed embodiment, based on the real-time acquired voltage and current stresses, further analysis can be performed to determine whether the voltage or current parameters of the test submodule are abnormal. Specifically, a threshold value can be set for each of the voltage and current stresses. When the voltage stress exceeds the corresponding threshold value, the voltage parameter is considered abnormal; when the current stress exceeds the corresponding threshold value, the current parameter is considered abnormal.

[0139] It is understood that the threshold values ​​are not unique and are not specifically limited. For example, in a more detailed embodiment, the threshold value corresponding to the voltage stress can be set to 90%, and the threshold value corresponding to the current stress can be set to 80%.

[0140] The above scheme can implement voltage stress testing based on the voltage parameters of the test submodule during the charging process, and implement current stress testing based on the current parameters, thereby determining the voltage stress state and current stress state of the energy storage valve submodule, and improving the operational reliability of the test submodule when it is put into use.

[0141] 10 , in some embodiments, step 106 further includes step 1063. Step 1063: determining the current fluctuation state and the temperature rise state of the test submodule according to the current parameter and the temperature parameter.

[0142] Specifically, current fluctuation refers to the fluctuation of the currently acquired current value relative to the previously acquired current value. Temperature rise refers to the increase in the currently acquired temperature parameter relative to the previously acquired temperature parameter. Similar to the voltage stress state and current stress state described above, the current fluctuation state can be a specific value of current fluctuation or an analysis result of whether the current fluctuation is normal; the temperature rise state can be a specific value of temperature rise or an analysis result of whether the temperature rise is normal, without specific limitation.

[0143] In more detail, in one embodiment, the processor pre-stores a current fluctuation standard threshold and a temperature rise standard threshold. After obtaining the current fluctuation value or the temperature rise value, the processor compares and analyzes the current fluctuation standard threshold and the temperature rise standard threshold, respectively. If the current fluctuation value is less than or equal to the current fluctuation standard threshold, the current fluctuation is considered normal; if the temperature rise value is less than or equal to the temperature rise standard threshold, the temperature rise is considered normal.

[0144] The above scheme can implement current fluctuation state testing based on the current parameters of the test submodule during the charging process, and implement temperature rise testing through temperature parameters, thereby determining the current fluctuation state and temperature rise state of the energy storage valve submodule, and improving the operational reliability of the test submodule when it is put into use.

[0145] It should be noted that in a more detailed embodiment, after obtaining at least one of the current parameters, voltage parameters, and temperature parameters through the above-mentioned test method, it is also possible to combine one or more of the current parameters, voltage parameters, and temperature parameters to analyze whether the test submodule can charge normally. The specific analysis method is not unique and can be achieved by analyzing the changing state of the voltage parameter, the changing state of the current parameter, or the changing state of the temperature parameter. In other embodiments, it can also be further analyzed based on the voltage stress state, the current stress state, the current fluctuation state, or the temperature rise state, which is not specifically limited.

[0146] Referring to Figure 11 , in some embodiments, the energy storage valve submodule testing method further includes steps 112, 114, and 116. Step 112: Controlling the test submodule to discharge the companion submodule. Step 114: Obtaining discharge state parameters of the test submodule during the discharge process. Step 116: Determining the operating state of the test submodule based on the discharge state parameters.

[0147] Specifically, when testing the sample submodule, in addition to the charging test in the above embodiment, the sample submodule can also be controlled to charge the companion submodule, obtain the discharge state parameters in this process, and implement the discharge test of the sample submodule in combination with the discharge state parameters.

[0148] It can be understood that the discharge state parameters can also include at least one of current parameters, voltage parameters, and temperature parameters. Combined with one or more of the current parameters, voltage parameters, and temperature parameters, one or more of the voltage stress test, current stress test, current fluctuation test, and temperature rise test can be implemented, without specific limitation.

[0149] It should be noted that in a more detailed embodiment, when performing a discharge test on the sample submodule, the specific operation is similar to the charging operation in the above embodiment. It is sufficient to treat the sample submodule in this embodiment as the companion test submodule in the above embodiment, and the companion test submodule in this embodiment as the sample submodule in the above embodiment. It is sufficient to output the corresponding control signal to control the sample submodule to charge the companion test submodule. The details are not repeated here.

[0150] The above solution can also realize the discharge test of the test submodule by controlling the test submodule to charge the companion test submodule, thereby further improving the operational reliability of the test submodule when it is put into use.

[0151] In order to facilitate understanding of the technical solution of the present application, the present application is explained below in conjunction with more detailed embodiments.

[0152] In this embodiment, both the test submodule and the accompanying test submodule are energy storage valve submodules with a half-bridge structure, forming a pair-pull architecture. The specific structure can be seen in Figure 6. In this architecture, the processor first obtains the amount of energy stored in the accompanying test submodule's energy storage module and analyzes whether it can complete a preset number of charging cycles. If not, the processor uses an external charging device to recharge the accompanying test submodule so that its stored energy can complete the charging test for several cycles. If so, the charging test is directly initiated.

[0153] During the charging test, the processor outputs a switch control signal to the test submodule based on a preset duty cycle and frequency, controlling the on / off switching of the first power switch device T1 and the second power switch device T2 in the power cell of the first power module 601 of the test submodule. During this process, the current sampling value of the test submodule is obtained in real time and compared and analyzed with the preset reference current to ensure that the current sampling value follows the preset reference current. The duty cycle required by the accompanying test submodule is then obtained through PI regulation. This is used to output a fixed-frequency switch control signal to the accompanying test submodule, controlling the on / off switching of the power switch device in the power cell of the second power module 603 of the accompanying test submodule, thereby enabling DC charging of the test submodule by the accompanying test submodule.

[0154] During the charging process, the processor can also obtain and analyze the voltage values ​​of the test submodule and the accompanying test submodule. If the voltage difference between the accompanying test submodule and the test submodule exceeds a first preset threshold, forward mode charging is initiated. At this time, the processor controls the first power switch device T1 to conduct and the second power switch device T2 to disconnect through a switch control signal. By controlling the two power switches of the accompanying test submodule to conduct in rotation, continuous and relatively stable DC charging is maintained.

[0155] When the voltage difference between the companion test submodule and the sample submodule is less than a second preset threshold, the second power switch T2 of the sample submodule is first controlled to conduct, and the power switch connected to the positive terminal of the second energy storage module 604 in the companion test submodule is also turned on, charging the inductor L. Thereafter, the first power switch T1 of the sample submodule is switched on, and the two switches of the companion test submodule are alternately turned on, transferring the electrical energy stored in the inductor L and the electrical energy stored in the second energy storage module of the companion test submodule to the sample submodule, achieving a voltage boost effect, i.e., realizing reverse mode charging.

[0156] During the forward mode charging or reverse mode charging process, the processor obtains the voltage parameters, current parameters and temperature parameters of the test submodule in real time, and analyzes whether the test submodule can be charged normally based on one or more of the voltage parameters, current parameters and temperature parameters obtained in real time. According to the voltage parameters or current parameters, the voltage stress and current stress are calculated respectively, and then compared and analyzed with the corresponding thresholds to obtain the result of whether the voltage parameters or current parameters are normal during the charging process. And according to the current parameters or temperature parameters, the current fluctuation value or temperature rise value is calculated, and it is compared and analyzed with the current fluctuation standard threshold and the temperature rise standard threshold respectively, and then it is determined whether there is a charging abnormality in the test submodule. Finally, when all the above tests are normal, it is determined that the test submodule is normal and can be put into use in the energy storage system with high operational reliability.

[0157] It should be understood that, although the various steps in the flowcharts involved in the various embodiments described above are displayed in sequence according to the instructions of the arrows, these steps are not necessarily executed in sequence in the order indicated by the arrows. Unless otherwise specified herein, there is no strict order restriction on the execution of these steps, and these steps can be executed in other orders. Moreover, at least a portion of the steps in the flowcharts involved in the various embodiments described above can include multiple steps or multiple stages, and these steps or stages are not necessarily executed and completed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a portion of steps or stages in other steps.

[0158] Based on the same technical concept, embodiments of the present application also provide an energy storage valve submodule testing device for implementing the aforementioned energy storage valve submodule testing method. The solution provided by this device is similar to the solution described in the aforementioned method. Therefore, the specific limitations of one or more energy storage valve submodule testing device embodiments provided below can be found in the above-described limitations of the energy storage valve submodule testing method and will not be further elaborated here.

[0159] Please refer to FIG. 12 , which shows a device for testing an energy storage valve submodule, including a charging control module 122 and a parameter acquisition module 124 .

[0160] The charging control module 122 is used to control the companion submodule to provide DC charging to the test submodule. The parameter acquisition module 124 is used to obtain the charging state parameters of the test submodule during the charging process. The charging state parameters are used to determine the operating state of the test submodule. Specifically, the energy storage valve submodule testing device can obtain the charging state parameters and then push them to the user, who then determines the operating state of the test submodule based on the charging state parameters. Alternatively, the device can obtain the charging state parameters, further determine the operating state of the test submodule based on the charging state parameters, and ultimately push the operating state results. This is not limited here.

[0161] Please refer to FIG. 13 . In some embodiments, the energy storage valve sub-module testing device further includes a power supply module 132 .

[0162] The power replenishment module 132 is used to control the accompanying test submodule to replenish power when the accompanying test submodule has a power replenishment demand.

[0163] In some embodiments, the charging control module 122 is further used to control the accompanying test submodule to charge the sample submodule in a forward mode when the voltage difference between the accompanying test submodule and the sample submodule is greater than a first preset threshold value; and to control the accompanying test submodule to charge the sample submodule in a reverse mode when the voltage difference between the accompanying test submodule and the sample submodule is less than a second preset threshold value.

[0164] In some embodiments, the charging control module 122 is further configured to control the test submodule to enter a charging mode and control the power switch devices of the accompanying test submodule to be turned on in rotation, so as to charge the test submodule in a forward mode through the energy storage module of the accompanying test submodule.

[0165] In some embodiments, the charging control module 122 is further used to control the accompanying test sub-module to charge the inductor; control the sample sub-module to enter the charging mode, and control the power switching devices of the accompanying test sub-module to be turned on in rotation, so as to charge the sample sub-module in the reverse mode through the electrical energy stored in the inductor and the energy storage module of the accompanying test sub-module.

[0166] In some embodiments, the charging control module 122 is further configured to input a switch control signal of arbitrary duty cycle and frequency to the sample submodule, and input a switch control signal of fixed frequency to the accompanying test submodule, to control the accompanying test submodule to provide DC charging to the sample submodule.

[0167] In some embodiments, the charging control module 122 is further configured to adjust the duty cycle of the switch control signal of the accompanying test submodule according to the current sampling value of the first terminal of the test submodule and a preset reference current.

[0168] Referring to FIG. 14 , in some embodiments, the energy storage valve submodule testing device further includes a discharge test module 142. The discharge test module 142 is configured to control the test submodule to discharge the companion test submodule, obtain discharge state parameters of the test submodule during the discharge process, and determine the operating state of the test submodule based on the discharge state parameters.

[0169] 15 , in some embodiments, the energy storage valve submodule test device further includes a state analysis module 152. The state analysis module 152 is configured to determine the voltage stress state and the current stress state of the test submodule during charging based on the voltage parameters and the current parameters.

[0170] In some embodiments, the state analysis module 152 is further configured to determine the current fluctuation state and the temperature rise state of the test submodule according to the current parameters and the temperature parameters.

[0171] The above solution uses a test submodule and a test product submodule to build a parallel-drag architecture. The test submodule is charged by the test submodule, and the charge state parameters of the test submodule are obtained during the charging process, thereby analyzing the operating status of the test submodule. This solution can simulate the actual operating conditions of the energy storage valve submodule, conduct operational testing on the energy storage valve submodule before it is put into use, reduce the probability of a faulty energy storage valve submodule being put into the energy storage system, and improve the operational reliability of the energy storage valve submodule.

[0172] Each module in the energy storage valve submodule testing device described above can be implemented in whole or in part through software, hardware, or a combination thereof. Each module can be embedded in or independent of a processor in a computer device in hardware form, or can be stored in a computer device memory in software form, so that the processor can call and execute the corresponding operations of each module.

[0173] In one embodiment, a computer device is provided, which may be a terminal, and its internal structure diagram may be as shown in FIG16 . The computer device includes a processor, a memory, a communication interface, a display screen, and an input device connected via a system bus. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The communication interface of the computer device is used to communicate with an external terminal in a wired or wireless manner, and the wireless manner may be implemented through WIFI, a mobile cellular network, NFC (near field communication) or other technologies. When the computer program is executed by the processor, a method for testing an energy storage valve submodule is implemented. The display screen of the computer device may be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer device may be a touch layer covering the display screen, or a key, trackball, or touchpad provided on the computer device housing, or an external keyboard, touchpad, or mouse.

[0174] Those skilled in the art will understand that the structure shown in Figure 16 is merely a block diagram of a portion of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than shown in the figure, or combine certain components, or have a different component arrangement.

[0175] In one embodiment, a computer device is provided, including a memory and a processor, wherein a computer program is stored in the memory, and when the processor executes the computer program, the following steps are implemented:

[0176] The accompanying test submodule is controlled to perform DC charging on the sample submodule; charging state parameters of the sample submodule during the charging process are obtained; and the operating state of the sample submodule is determined according to the charging state parameters.

[0177] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the following steps are implemented:

[0178] The accompanying test submodule is controlled to perform DC charging on the sample submodule; charging state parameters of the sample submodule during the charging process are obtained; and the operating state of the sample submodule is determined according to the charging state parameters.

[0179] In one embodiment, a computer program product is provided, comprising a computer program, which, when executed by a processor, implements the following steps:

[0180] The accompanying test submodule is controlled to perform DC charging on the sample submodule; charging state parameters of the sample submodule during the charging process are obtained; and the operating state of the sample submodule is determined according to the charging state parameters.

[0181] The aforementioned computer device, storage medium, and computer program product utilize a test submodule and a sample submodule to establish a tandem architecture. The test submodule is used to charge the sample submodule, obtaining the test submodule's charging state parameters during the charging process and analyzing the test submodule's operating status. This solution simulates the actual operating conditions of the energy storage valve submodule, allowing for operational testing of the energy storage valve submodule before it is put into operation. This reduces the probability of a faulty energy storage valve submodule being deployed into the energy storage system and improves its operational reliability.

[0182] Please refer to Figure 17. The present application also provides an energy storage valve submodule testing system, including a test submodule 202, a test submodule 204 and a processor (not shown in the figure). The test submodule 202 includes a connected first power module 601 and a first energy storage module 602. The test submodule 204 includes a connected second power module 603 and a second energy storage module 604. The high-voltage end of the first power module 601 is connected to the high-voltage end of the second power module 603, and the low-voltage end of the first power module 601 is connected to the low-voltage end of the second power module 603. The control end of the first power module 601 and the control end of the second power module 603 are respectively connected to the processor (not shown in the figure). The processor is used to test the test submodule according to the above-mentioned energy storage valve submodule testing method.

[0183] Specifically, the specific testing method implemented by the energy storage valve submodule test system is as shown in the above-mentioned embodiments and will not be repeated here. This solution uses the accompanying test submodule 204 and the test sample submodule 202 to build a towing architecture, uses the accompanying test submodule 204 to charge the test sample submodule 202, obtains the charging state parameters of the test sample submodule 202 during the charging process, and thus analyzes the operating state of the test sample submodule 202. Through this solution, the actual operating conditions of the energy storage valve submodule can be simulated. Before the energy storage valve submodule is put into use, the energy storage valve submodule is tested for operation, reducing the probability of a faulty energy storage valve submodule being put into the energy storage system and improving the operational reliability of the energy storage valve submodule.

[0184] In one embodiment, referring to FIG. 18 , the energy storage valve submodule testing system further includes an inductor L, and the high voltage end of the first power module 601 is connected to the high voltage end of the second power module 603 via the inductor L.

[0185] Specifically, both the companion submodule 204 and the sample submodule 202 include a power module and an energy storage module. The power conversion in the power module controls the charge and discharge of the energy storage module. The first end of the first power module 601 is connected to the first end of the second power module 603 via an inductor L, and the second end of the first power module 601 is connected to the second end of the second power module 603, thereby forming a pair-pull architecture.

[0186] In one embodiment, the processor has a current sampling function, so the high-voltage end of the first power module 601 can be connected to the processor and the inductor L, and the load current of the test sub-module 202 during the charging process is collected by the processor, that is, the current sampling value is obtained, and then the duty cycle of the switch control signal of the accompanying test sub-module 204 is adjusted according to the current sampling value.

[0187] It is understandable that in another embodiment, the current sampling value can also be achieved through an additional current collector. In this case, the high-voltage end of the first power module 601 only needs to be connected to the inductor L, and the current sampling value is obtained by wired or wireless communication between the processor and the current collector.

[0188] In the above solution, an inductor is placed between the high-voltage terminals of the first and second power modules. The testing method for this structure can be found in the description of the energy storage valve submodule test method above and will not be repeated here. This solution allows the inductor to store energy even when the voltage of the companion submodule is low, thereby charging the sample submodule and improving the reliability of the charging process.

[0189] Please refer to FIG. 19 . In some embodiments, the energy storage valve submodule testing system further includes an energy replenishment circuit 162 . The energy replenishment circuit 162 is connected to a second energy storage module 604 (not shown).

[0190] Specifically, to simulate the various operating conditions of the test submodule 202 as closely as possible, the accompanying test submodule 204 is required to charge the test submodule 202 for a relatively long time. However, the electrical energy stored in the energy storage module of the accompanying test submodule 204 may be too low to meet the long-term charging requirements. Therefore, the solution of this embodiment requires that when the accompanying test submodule 204 needs to be recharged, the accompanying test submodule 204 be controlled to recharge in order to achieve a long-term operation test. This solution, by providing an energy recharge circuit 162 in the accompanying test submodule 204, can start or end the charging of the accompanying test submodule 204 in real time according to actual needs during the test process, thereby increasing the charging operation time of the accompanying test submodule 204.

[0191] In the above solution, an energy replenishment circuit 162 is further provided in the energy storage valve submodule test system. The energy replenishment circuit 162 replenishes power for the accompanying test submodule 204, which can effectively increase the endurance time of the accompanying test submodule 204, so that the energy storage valve submodule can perform long-term operation testing.

[0192] 19 , in some embodiments, the energy compensation circuit 162 includes a switch device D1 and a current source LS. The current source LS is connected to the second energy storage module 604 (not shown) of the test sub-module 204 through the switch device D1 .

[0193] Specifically, the current source LS is a power supply device capable of providing a constant current to replenish the power of the companion test sub-module 204. Specifically, the current source LS provided in the embodiment of the present application is a DC current source. Furthermore, the energy replenishment circuit 162 is also provided with a switching device D1, which can prevent current from the companion test sub-module 204 from flowing back into the current source LS, thereby improving the operational safety of the current source LS. It should be noted that the specific type of switching device D1 is not limited to a single device; any device that prevents current from the companion test sub-module 204 from flowing back into the current source LS can be used. For example, in a more detailed embodiment, the switching device D1 includes a diode, in which case the anode of the diode is connected to the current source LS, and the cathode of the diode is connected to the second energy storage module 604.

[0194] In the above solution, the energy replenishment circuit 162 specifically includes a switch device D1 and a current source LS connected in series, which has a simple structure and can effectively save the volume and circuit cost of the energy storage valve submodule test system.

[0195] In some embodiments, the first power module 601 includes a first power unit and a first capacitor connected in parallel, the high voltage end of the first power unit is connected to the high voltage end of the second power module 603, and the low voltage end of the first power unit is connected to the low voltage end of the second power module 603.

[0196] And / or, in some embodiments, the second power module 603 includes a second power unit and a second capacitor in parallel, the high voltage end of the second power unit is connected to the high voltage end of the first power module 601, and the low voltage end of the second power unit is connected to the low voltage end of the first power module 601.

[0197] In the above scheme, the first power module 601 and the second power module 603 both include power cells and capacitors. By building this test architecture, it is possible to test an energy storage valve submodule of the type in which the power module includes a power cell and a capacitor, thereby improving the operational reliability of this type of energy storage valve submodule.

[0198] Furthermore, in some embodiments, the first power module 601 includes a full-bridge power module or a half-bridge power module, and the second power module 603 includes a full-bridge power module or a half-bridge power module.

[0199] Please refer to Figure 6. Taking the first power module 601 and the second power module 603 having the same structure and including a half-bridge structure as an example, the first power module 601 includes a first power switch device T1, a second power switch device T2 and a first capacitor C1. The common terminal of the first power switch device T1 and the second power switch device T2 serves as a high-voltage terminal. Correspondingly, the input terminal of the first power switch device T1 is connected to the input terminal of the second power switch device T2, a processor (not shown), and the first end of the inductor L. The output terminal of the first power switch device T1 is connected to the first end of the first capacitor C1 and the first end of the first energy storage module 602. The output terminal of the second power switch device T2 serves as a low-voltage terminal and is connected to the second power module 603. The output terminal of the second power switch device T2 is also connected to the second end of the first capacitor C1 and the second end of the first energy storage module 602. The control terminal of the first power switch device T1 and the control terminal of the second power switch device T2 are respectively connected to the processor (not shown).

[0200] Specifically, in the solution of this embodiment, the common connection end of the first power switch device T1 and the second power switch device T2 is used as the high-voltage end of the first power module 601, and the output end of the second power switch device T2 is used as the low-voltage end of the first power module 601, thereby connecting to the first energy storage module 602, the inductor L and the accompanying test sub-module 204. The structure of the accompanying test sub-module 204 is consistent with the structure of the test sub-module 202, and is mirror-symmetrical to form a pair-pull architecture.

[0201] In the above solution, both the test submodule 202 and the accompanying test submodule 204 are half-bridge structures, which can realize the drag test of the energy storage valve submodule under the half-bridge structure and improve the operational reliability of the energy storage valve submodule under the half-bridge structure.

[0202] Please refer to FIG20 . In some embodiments, taking the first power module 601 and the second power module 603 having the same structure and including a full-bridge structure as an example, the first power module 601 includes a third power switch device T3, a fourth power switch device T4, a fifth power switch device T5, a sixth power switch device T6 and a second capacitor C2. The input end of the third power switch device T3 is connected to the input end of the fourth power switch device T4, a processor (not shown) and a first end of the inductor L. The output end of the third power switch device T3 is connected to the first end of the second capacitor C2 and the first end of the first energy storage module 602. The first end of block 602 is also connected to the input end of the fifth power switch device T5, the output end of the fifth power switch device T5 is connected to the input end of the sixth power switch device T6 and the second power module 603, the output end of the sixth power switch device T6 is connected to the second end of the first energy storage module 602, the output end of the fourth power switch device T4 is connected to the second end of the second capacitor C2 and the second end of the first energy storage module 602, and the control end of the third power switch device T3, the control end of the fourth power switch device T4, the control end of the fifth power switch device T5, and the control end of the sixth power switch device T6 are respectively connected to a processor (not shown).

[0203] Specifically, in this embodiment, the common connection terminal of the third power switch device T3 and the fourth power switch device T4 serves as the high-voltage terminal of the first power module 601, the common connection terminal of the fifth power switch device T5 and the sixth power switch device T6 serves as the low-voltage terminal of the first power module 601, and the control terminals of each power switch device serve as the control terminals of the first power module 601. In this way, the first energy storage module 602, the inductor L, and the accompanying test submodule 204 are connected. The structure of the accompanying test submodule 204 is consistent with that of the test product submodule 202, and is mirror-symmetrical, forming a pair-pull architecture.

[0204] In the above solution, both the test submodule 202 and the accompanying test submodule 204 are full-bridge structures, which can realize the dragging test of the energy storage valve submodule under the full-bridge structure and improve the operational reliability of the energy storage valve submodule of the full-bridge structure.

[0205] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A method for testing an energy storage valve submodule, comprising: Control the test companion submodule to perform DC charging on the sample submodule, wherein the sample submodule includes a first power module and a first energy storage module connected to each other, the test companion submodule includes a second power module and a second energy storage module connected to each other, the high voltage end of the first power module is connected to the high voltage end of the second power module, and the low voltage end of the first power module is connected to the low voltage end of the second power module; Obtaining charging status parameters of the test submodule during the charging process; and The operating state of the test submodule is determined according to the charging state parameter.

2. The energy storage valve submodule testing method according to claim 1, wherein: The control test companion submodule is to DC charge the test sample submodule, including: When the voltage difference between the accompanying test submodule and the sample submodule is greater than a first preset threshold, controlling the accompanying test submodule to charge the sample submodule in a forward mode; When the voltage difference between the accompanying test submodule and the sample submodule is less than a second preset threshold, the accompanying test submodule is controlled to charge the sample submodule in reverse mode; wherein the first preset threshold is greater than or equal to the second preset threshold.

3. The energy storage valve submodule testing method according to claim 2, wherein: The control test companion submodule charges the test product submodule in a forward mode, including: The test submodule is controlled to enter a charging mode, and the power switch device of the companion test submodule is controlled to be turned on in rotation, so as to charge the test submodule in a forward mode through the second energy storage module.

4. The energy storage valve submodule testing method according to claim 2 or 3, wherein: The high voltage end of the first power module is connected to the high voltage end of the second power module through an inductor, and the control test submodule charges the test submodule in reverse mode, including: Controlling the accompanying test submodule to charge the inductor; The test submodule is controlled to enter a charging mode, and the power switch device of the companion test submodule is controlled to be turned on in rotation, so as to charge the test submodule in a reverse mode through the electric energy stored in the inductor and the second energy storage module.

5. The energy storage valve submodule testing method according to any one of claims 1 to 4, wherein: The control test companion submodule is to DC charge the test sample submodule, including: Input a switch control signal of any duty cycle and frequency to the test submodule, and input a switch control signal of any duty cycle and frequency to the companion test submodule. The submodule inputs a switch control signal of a fixed frequency to control the accompanying test submodule to perform direct current charging on the test product submodule.

6. The energy storage valve submodule testing method according to claim 5, wherein: Also includes: The duty cycle of the switch control signal of the accompanying test submodule is adjusted according to the current sampling value of the first end of the test submodule and the preset reference current.

7. The energy storage valve submodule testing method according to any one of claims 1 to 6, wherein: The charging state parameter includes at least one of a current parameter, a voltage parameter, and a temperature parameter.

8. The energy storage valve submodule testing method according to claim 7, wherein: Determining the operating state of the test submodule according to the charging state parameter includes: Determining a voltage stress state and a current stress state of the test submodule during charging according to the voltage parameter and the current parameter; And / or, determining the current fluctuation state and the temperature rise state of the test submodule according to the current parameter and the temperature parameter.

9. The energy storage valve submodule testing method according to any one of claims 1 to 8, wherein: Also includes: When the accompanying test submodule has a need for power supplement, the accompanying test submodule is controlled to perform power supplement.

10. The energy storage valve submodule testing method according to any one of claims 1 to 9, wherein: Also includes: Controlling the test product submodule to discharge the accompanying test submodule; Obtaining discharge state parameters of the test submodule during the discharge process; The operating state of the test submodule is determined according to the discharge state parameter.

11. A storage valve submodule testing device, comprising: a charging control module, used for controlling the accompanying test submodule to perform direct current charging on the sample submodule, wherein the sample submodule comprises a first power module and a first energy storage module connected to each other, the accompanying test submodule comprises a second power module and a second energy storage module connected to each other, a high voltage end of the first power module is connected to a high voltage end of the second power module, and a low voltage end of the first power module is connected to a low voltage end of the second power module; and The parameter acquisition module is used to acquire the charging state parameters of the sample submodule during the charging process; the charging state parameters are used to determine the operating state of the sample submodule.

12. A computer device, comprising a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of the energy storage valve submodule testing method according to any one of claims 1 to 10 when executing the computer program.

13. A computer-readable storage medium having a computer program stored thereon, wherein when the computer program is executed by a processor, the steps of the energy storage valve submodule testing method according to any one of claims 1 to 10 are implemented.

14. A computer program product, comprising a computer program, wherein when the computer program is executed by a processor, the steps of the energy storage valve submodule testing method according to any one of claims 1 to 10 are implemented.

15. A storage valve submodule testing system, comprising a test submodule, a companion test submodule and a processor, the test submodule comprising a first power module and a first energy storage module connected to each other, the companion test submodule comprising a second power module and a second energy storage module connected to each other, the high voltage end of the first power module being connected to the high voltage end of the second power module, the low voltage end of the first power module being connected to the low voltage end of the second power module, the control end of the first power module and the control end of the second power module being respectively connected to the processor, and the processor being used to test the test submodule according to the energy storage valve submodule testing method according to any one of claims 1 to 10.

16. The energy storage valve submodule testing system according to claim 15, wherein: An inductor is also included, and the high-voltage end of the first power module is connected to the high-voltage end of the second power module through the inductor.

17. The energy storage valve submodule testing system according to claim 15 or 16, wherein: It also includes an energy replenishment circuit, which is connected to the second energy storage module.

18. The energy storage valve submodule testing system according to claim 17, wherein: The energy compensation circuit includes a switch device and a current source, and the current source is connected to the second energy storage module through the switch device.

19. The energy storage valve submodule testing system according to any one of claims 15 to 18, wherein: The first power module includes a first power unit and a first capacitor connected in parallel, a high voltage end of the first power unit is connected to a high voltage end of the second power module, and a low voltage end of the first power unit is connected to a low voltage end of the second power module; And / or, the second power module includes a second power unit and a second capacitor connected in parallel, the high voltage end of the second power unit is connected to the high voltage end of the first power module, and the low voltage end of the second power unit is connected to the low voltage end of the first power module.

20. The energy storage valve submodule testing system according to claim 19, wherein: The first power module includes a full-bridge power module or a half-bridge power module, and the second power module includes a full-bridge power module or a half-bridge power module.

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