Aging system of energy storage module

Abstract

The utility model provides an aging system of an energy storage module. The system comprises a charging module, an AC circuit breaker, a DC contactor, the energy storage module and an aging control terminal. The alternating-current end of the charging module is connected with the first end of the alternating-current circuit breaker and the alternating-current bus, the direct-current end of the charging module is connected with the first end of the direct-current contactor, and the control end of the charging module is connected to the aging control terminal through the first controller local area network bus; the energy storage module and the charging module are connected in parallel through the direct current contactor, the alternating current end of the energy storage module is connected with the first end of the alternating current circuit breaker and the alternating current bus, the direct current end of the energy storage module is connected with the second end of the direct current contactor and the direct current bus, and the control end of the energy storage module is connected to the aging control terminal through a second controller local area network bus; the aging control terminal is used for controlling the working states of the charging module and the energy storage module and the on-off of the DC contactor and the AC circuit breaker so as to carry out an aging test on the energy storage module, reduce the electric quantity waste and improve the aging efficiency.

Description

Technical Field

[0001] This application relates to the field of energy storage technology, and more specifically, to an aging system for an energy storage module. Background Technology

[0002] In the production and assembly process of energy storage modules, in order to ensure the stability and reliability of the produced energy storage modules in actual use, it is usually necessary to conduct aging tests before leaving the factory to screen out defective products and ensure that the quality of the energy storage modules leaving the factory meets the standards.

[0003] Currently, aging tests are mainly conducted using single-module and dual-module methods. In a single-module aging test scenario, the AC terminal of one energy storage module is connected to the power grid, and the DC terminal is connected to the battery. During the aging process, the battery is charged in the first half and discharged in the second half. In this test scenario, the equipment investment cost is relatively high, and the injection and extraction of power from the power grid during the aging process causes voltage fluctuations on the grid side and excessive load on electrical switches. In a dual-module aging test scenario, the AC terminals of two energy storage modules are connected to the power grid, and the DC terminals are connected to the battery. During the aging process, one energy storage module charges the battery, and the other discharges the battery. Only two energy storage modules can be aged in one aging process, resulting in low aging efficiency.

[0004] Therefore, there are certain limitations to the aging test of energy storage modules in the existing technology. Utility Model Content

[0005] The purpose of this application is to address the shortcomings of the prior art by providing an aging system for energy storage modules, thereby solving the practical problem of the limitations of existing aging tests for energy storage modules.

[0006] To achieve the above objectives, the technical solutions adopted in the embodiments of this application are as follows:

[0007] In a first aspect, embodiments of this application provide an aging system for an energy storage module, the system comprising: a charging module, an AC circuit breaker, a DC contactor, an energy storage module, and an aging control terminal;

[0008] The AC terminal of the charging module is connected to the first terminal of the AC circuit breaker and the AC bus, the DC terminal of the charging module is connected to the first terminal of the DC contactor, and the control terminal of the charging module is connected to the aging control terminal through the first controller local area network bus.

[0009] The energy storage module is connected in parallel with the charging module through the DC contactor, an AC end of the energy storage module is connected with the first end of the AC circuit breaker and an AC bus, a DC end of the energy storage module is connected with the second end of the DC contactor and a DC bus, and a control end of the energy storage module is connected to the aging control terminal through a second controller area network bus.

[0010] The aging control terminal is configured to control working states of the charging module and the energy storage module and on-off states of the DC contactor and the AC circuit breaker, so as to perform the aging test on the energy storage module.

[0011] As an optional implementation, the energy storage module comprises a master energy storage module and a slave energy storage module.

[0012] The master energy storage module is connected in parallel with the slave energy storage module, an AC end of the master energy storage module is connected with the first end of the AC circuit breaker, the AC bus and an AC end of the slave energy storage module, and a DC end of the master energy storage module is connected with the second end of the DC contactor, the DC bus and a DC end of the slave energy storage module.

[0013] A first control end of the master energy storage module and a first control end of the slave energy storage module are connected to the aging control terminal through the second controller area network bus, and a second control end of the master energy storage module is connected to a second control end of the slave energy storage module through a synchronization signal bus.

[0014] As an optional implementation, a control mode of the master energy storage module is a DC-end constant-voltage mode, and a control mode of the slave energy storage module is an AC-end constant-power mode.

[0015] The master energy storage module is configured to provide a constant DC voltage to the slave energy storage module through the DC bus and perform power balance, so that a sum of powers of the master energy storage module and the slave energy storage module satisfies a first preset condition.

[0016] As an optional implementation, the slave energy storage module comprises at least one first energy storage module and at least one second energy storage module.

[0017] Each of the first energy storage modules and each of the second energy storage modules are connected in parallel, an AC end of each of the first energy storage modules is connected with the first end of the AC circuit breaker, the AC bus, an AC end of the master energy storage module and an AC end of each of the second energy storage modules, and a DC end of each of the first energy storage modules is connected with the second end of the DC contactor, the DC bus, a DC end of the master energy storage module and a DC end of each of the second energy storage modules.

[0018] The first control end of each first energy storage module and the first control end of each second energy storage module are connected to the aging control terminal through the second controller local area network bus, and the second control end of each first energy storage module and the second control end of each second energy storage module are connected to the second control end of the master energy storage module through the synchronization signal bus.

[0019] As an optional implementation, each first energy storage module is configured to output a preset positive power in a first aging test phase and output a preset negative power in a second aging test phase under the control of the aging control terminal.

[0020] Each second energy storage module is configured to output the preset negative power in the first aging test phase and output the preset positive power in the second aging test phase under the control of the aging control terminal.

[0021] As an optional implementation, if the number of the first energy storage modules or the second energy storage modules is greater than one, the master energy storage module sends a synchronization signal to each first energy storage module and each second energy storage module through the synchronization signal bus, and performs parallel processing on the master energy storage module, each first energy storage module and each second energy storage module according to the synchronization signal.

[0022] As an optional implementation, the charging module is configured to provide a constant direct current voltage to the master energy storage module when the direct current contactor is closed.

[0023] After the master energy storage module is started, the aging control terminal controls the direct current contactor to be opened.

[0024] As an optional implementation, in the first aging test phase, the master energy storage module is configured to adjust the output power of the master energy storage module according to the preset positive power output by each first energy storage module and the preset negative power output by each second energy storage module, so that the sum of the powers of the master energy storage module, each first energy storage module and each second energy storage module satisfies a second preset condition.

[0025] As an optional implementation, in the second aging test phase, the master energy storage module is configured to adjust the output power of the master energy storage module according to the preset negative power output by each first energy storage module and the preset positive power output by each second energy storage module, so that the sum of the powers of the master energy storage module, each first energy storage module and each second energy storage module satisfies a second preset condition.

[0026] As an optional implementation, the aging system of the energy storage module further comprises a controller area network to universal serial bus converter.

[0027] The first interface of the controller area network to universal serial bus converter is connected to the charging module through the first controller area network bus, the second interface of the controller area network to universal serial bus converter is connected to the energy storage module through the second controller area network bus, and the third interface of the controller area network to universal serial bus converter is connected to the aging control terminal through the universal serial bus.

[0028] The controller area network to universal serial bus converter is used for mutual conversion between universal serial bus signals and controller area network signals.

[0029] The application has the following beneficial effects:

[0030] The application provides an aging system of an energy storage module, which comprises a charging module, an AC circuit breaker, a DC contactor, an energy storage module and an aging control terminal. The AC end of the charging module is connected to the first end of the AC circuit breaker and an AC bus, the DC end is connected to the first end of the DC contactor, and the control end is connected to the aging control terminal through a first controller area network bus. The energy storage module is connected in parallel with the charging module through the DC contactor. The AC end of the energy storage module is connected to the first end of the AC circuit breaker and the AC bus, the DC end is connected to the second end of the DC contactor and a DC bus, and the control end is connected to the aging control terminal through a second controller area network bus. The aging control terminal controls the working state of the charging module through the first controller area network bus and controls the working state of the energy storage module through the second controller area network bus. The DC source of the test system of the energy storage aging is switched by controlling the on-off of the DC contactor, and the AC source is provided to the energy storage module and the charging module by closing the AC circuit breaker. No power needs to be injected into or taken out of the power grid, the voltage fluctuation of the power grid side is avoided, the electrical switch load is reduced, the power waste is reduced, and the aging efficiency and effect of the energy storage module are improved. BRIEF DESCRIPTION OF DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some of the embodiments of the application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0032] Figure 1 The first architecture schematic diagram of the aging system of the energy storage module provided by the embodiments of the application;

[0033] Figure 2 A second architecture schematic diagram of the aging system of the energy storage module provided by the embodiment of the present application is shown in FIG. 2.

[0034] Figure 3 A third architecture schematic diagram of the aging system of the energy storage module provided by the embodiment of the present application is shown in FIG. 3.

[0035] Figure 4 A fourth architecture schematic diagram of the aging system of the energy storage module provided by the embodiment of the present application is shown in FIG. 4.

[0036] Icon: energy storage module: 11; charging module: 12; aging control terminal: 13; AC circuit breaker: K1; DC contactor: K2; controller area network to universal serial bus converter: 14; master energy storage module: 111; slave energy storage module: 112; first energy storage module: 1121; second energy storage module: 1122. DETAILED DESCRIPTION

[0037] In order to make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0038] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without making creative efforts fall within the scope of protection of the present application.

[0039] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. In the description of the present application, the terms “first”, “second”, “third” and the like are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0040] In the description of the present application, unless otherwise explicitly specified and limited, the terms “set”, “connected”, “connected” should be understood broadly, for example, can be fixedly connected, can be detachably connected, or integrally connected; can be mechanically connected, or electrically connected; can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0041] In the field of energy storage, in order to detect the performance of the energy storage module, the energy storage module needs to be subjected to aging test. At present, the single module aging test or double module aging test of the energy storage module has the disadvantages of large equipment investment cost, small number of aging and large voltage fluctuation of power grid.

[0042] Based on the above problems, the embodiment of the present application provides an aging system of energy storage module. The aging control terminal controls the on-off of the charging module, the energy storage module, the direct current contactor and the alternating current circuit breaker, and performs aging test on the master energy storage module and the slave energy storage module in the energy storage module. No additional equipment investment is needed, at least four energy storage modules can be simultaneously aged at one time, the waste of electric quantity and the fluctuation of voltage on the power grid side are reduced, and the aging efficiency and the accuracy of the aging test are improved.

[0043] Figure 1 The first architecture diagram of the aging system of energy storage module provided by the embodiment of the present application is shown in Figure 1 The aging system of energy storage module includes a charging module 12, an alternating current circuit breaker K1, a direct current contactor K2, an energy storage module 11 and an aging control terminal 13.

[0044] Optionally, referring to Figure 1 When the energy storage module 11 is subjected to aging test, the aging system of energy storage module includes the alternating current circuit breaker K1, the direct current contactor K2, the aging control terminal 13, the charging module 12 in communication connection with the aging control terminal 13 and the energy storage module 11.

[0045] The alternating current end of the charging module 12 is connected with the first end of the alternating current circuit breaker K1 and the alternating current bus, the direct current end of the charging module 12 is connected with the first end of the direct current contactor K2, and the control end of the charging module 12 is connected to the aging control terminal 13 through the first controller area network bus.

[0046] Optionally, continuing to refer to Figure 1The charging module 12 includes an alternating current end, a direct current end and a control end. The alternating current end of the charging module 12 is connected to an alternating current bus (AC bus for short) and connected to a first end of an alternating current circuit breaker K1 and an alternating current end of the energy storage module 11 respectively. When the alternating current circuit breaker K1 is closed, three-phase alternating current power supply is connected to the AC bus as an alternating current source. The direct current end of the charging module 12 is connected to a first end of a direct current contactor K2, and a second end of the direct current contactor K2 is connected to a direct current bus (DC bus for short). When the direct current contactor K2 is closed, the charging module 12 is connected to the DC bus as a direct current source. The control end of the charging module 12 is connected to the aging control terminal 13 through a first controller area network (CAN for short) bus CAN1 to receive a control signal sent by the aging control terminal 13 through the first CAN bus CAN1.

[0047] The energy storage module 11 and the charging module 12 are connected in parallel through the direct current contactor K2. The alternating current end of the energy storage module 11 is connected to the first end of the alternating current circuit breaker K1 and the AC bus. The direct current end of the energy storage module 11 is connected to the second end of the direct current contactor K2 and the DC bus. The control end of the energy storage module 11 is connected to the aging control terminal 13 through a second CAN bus.

[0048] Optionally, continuing to refer to Figure 1 The charging module 12 and the direct current contactor K2 are connected in series, and the energy storage module 11 and the charging module 12 are connected in parallel through the direct current contactor K2. The energy storage module 11 includes an alternating current end, a direct current end and a control end. The alternating current end of the energy storage module 11 is connected to the AC bus and connected to the first end of the alternating current circuit breaker K1 and the alternating current end of the charging module 12 respectively. The direct current end of the energy storage module 11 is connected to the DC bus and connected to the second end of the direct current contactor K2. The control end of the energy storage module 11 is connected to the aging control terminal 13 through a second CAN bus CAN2 to receive a control signal sent by the aging control terminal 13 through the second CAN bus CAN2.

[0049] The aging control terminal 13 is used for controlling working states of the charging module 12 and the energy storage module 11 and on-off states of the direct current contactor K2 and the alternating current circuit breaker K1, so as to perform aging test on the energy storage module 11.

[0050] Optionally, continuing to refer to Figure 1When the aging test is performed on the energy storage module 11, the aging control terminal 13 sends a control signal to the charging module 12 through the first CAN bus CAN1 to control the working state of the charging module 12, and sends a control signal to the energy storage module 11 through the second CAN bus CAN2 to control the working state of the energy storage module 11. The working state includes an on state and an off state. The aging control terminal 13 switches the DC source of the test system of the energy storage aging according to different aging test stages by closing or turning off the DC contactor K2. When the DC contactor K2 is closed, the DC source is the charging module 12. When the DC contactor K2 is turned off, the DC source is the energy storage module 11. The aging control terminal 13 provides an AC source of three-phase AC power to the energy storage module 11 and the charging module 12 by closing the AC circuit breaker K1.

[0051] In the embodiment, the charging module, the AC circuit breaker, the DC contactor, the energy storage module and the aging control terminal are arranged in the aging system of the energy storage module. The AC end of the charging module is connected with the first end of the AC circuit breaker and the AC bus, the DC end is connected with the first end of the DC contactor, and the control end is connected to the aging control terminal through the first CAN bus. The energy storage module is connected in parallel with the charging module through the DC contactor. The AC end of the energy storage module is connected with the first end of the AC circuit breaker and the AC bus, the DC end is connected with the second end of the DC contactor and the DC bus, and the control end is connected to the aging control terminal through the second CAN bus. The aging control terminal controls the working state of the charging module through the first CAN bus and controls the working state of the energy storage module through the second CAN bus. The DC source of the test system of the energy storage aging is switched by controlling the on-off of the DC contactor, and the AC source is provided to the energy storage module and the charging module by closing the AC circuit breaker. No power needs to be injected into or taken out of the power grid, avoiding the fluctuation of the voltage on the power grid side and reducing the load of the electrical switch. The waste of electricity is reduced, and the aging efficiency and effect of the energy storage module are improved.

[0052] Figure 2 A second schematic diagram of the aging system of the energy storage module is provided in the embodiment of the present application, as shown in Figure 2 The aging system of the energy storage module further includes a CAN to universal serial bus (USB) converter 14.

[0053] Optionally, referring to Figure 2 The aging system of the energy storage module further includes a CAN to universal serial bus (USB) converter 14. The CAN to USB converter is connected with the charging module 12, the energy storage module 11 and the aging control terminal 13, and can realize mutual conversion between the CAN signal and the USB signal.

[0054] The first interface of the controller area network to universal serial bus converter 14 is connected to the charging module 12 through a first controller area network bus, the second interface of the controller area network to universal serial bus converter 14 is connected to the energy storage module 11 through a second controller area network bus, and the third interface of the controller area network to universal serial bus converter 14 is connected to the aging control terminal 13 through a universal serial bus.

[0055] Optionally, still referring to Figure 2 , the CAN to USB converter 14 includes three interfaces, namely a first interface, a second interface and a third interface, wherein the first interface and the second interface are CAN interfaces, and the third interface is a USB interface. The first interface of the CAN to USB converter 14 is connected to the charging module 12 through a first CAN bus CAN1, the second interface is connected to the energy storage module 11 through a second CAN bus, and the third interface is connected to the aging control terminal 13 through a USB bus.

[0056] The controller area network to universal serial bus converter 14 is used for mutual conversion between universal serial bus signals and controller area network signals.

[0057] Optionally, through mutual conversion between CAN signals and USB signals, the CAN to USB converter 14 can convert the CAN signals transmitted by the first CAN bus CAN1 and the CAN signals transmitted by the second CAN bus CAN2 into USB signals that can be read and analyzed by the aging control terminal 13, and convert the USB control signals sent by the aging control terminal 13 into CAN control signals, so that the aging control terminal 13 indirectly controls the working states of the charging module 12 and the energy storage module 11 through the CAN control signals.

[0058] In this embodiment, by setting the controller area network to universal serial bus converter in the aging system of the energy storage module, the first interface of the controller area network to universal serial bus converter is connected to the charging module through a first controller area network bus, the second interface of the controller area network to universal serial bus converter is connected to the energy storage module through a second controller area network bus, and the third interface of the controller area network to universal serial bus converter is connected to the aging control terminal through a universal serial bus. Through the mutual conversion between universal serial bus signals and controller area network signals by the controller area network to universal serial bus converter, it is convenient for the aging control terminal to read and analyze the controller area network signals sent by the charging module and the energy storage module, and it is convenient for the aging control terminal to control the working states of the charging module and the energy storage module through the controller area network control signals. The flexibility of data transmission is improved.

[0059] Figure 3 The second architecture diagram of the aging system of the energy storage module provided in the embodiment of the present application is as follows:Figure 3 As shown, the energy storage module 11 includes a master energy storage module 111 and a slave energy storage module 112.

[0060] Optionally, referring to Figure 3 , the energy storage module 11 includes two control modules, namely the master energy storage module 111 and the slave energy storage module 112. The master energy storage module 111 and the slave energy storage module 112 are synchronized through a synchronization signal bus.

[0061] The master energy storage module 111 and the slave energy storage module 112 are connected in parallel. The AC end of the master energy storage module 111 is connected to the first end of the AC circuit breaker K1, the AC bus, and the AC end of the slave energy storage module 112. The DC end of the master energy storage module 111 is connected to the second end of the DC contactor K2, the DC bus, and the DC end of the slave energy storage module 112.

[0062] Optionally, continuing to refer to Figure 3 , the master energy storage module 111 and the slave energy storage module 112 in the energy storage module 11 are connected in parallel. The master energy storage module 111 and the slave energy storage module 112 each include a DC end and an AC end. The AC end of the master energy storage module 111 and the AC end of the slave energy storage module 112 are connected to the AC Bus and connected to the first end of the AC circuit breaker K1 and the AC end of the charging module 12. The DC end of the master energy storage module 111 and the DC end of the slave energy storage module 112 are connected to the DC Bus and connected to the second end of the DC contactor K2.

[0063] The first control end of the master energy storage module 111 and the first control end of the slave energy storage module 112 are connected to the aging control terminal 13 through a second controller area network (CAN) bus. The second control end of the master energy storage module 111 is connected to the second control end of the slave energy storage module 112 through a synchronization signal bus.

[0064] Optionally, continuing to refer to Figure 3 , the master energy storage module 111 and the slave energy storage module 112 each further include two control ends. The first control end of the master energy storage module 111 and the first control end of the slave energy storage module 112 are respectively connected to the second interface of the CAN-to-USB converter 14 through a second CAN bus CAN2. The third interface of the CAN-to-USB converter 14 is connected to the aging control terminal 13 through a USB bus. The master energy storage module 111 and the slave energy storage module 112 indirectly communicate with the aging control terminal 13. The second control end of the master energy storage module 111 is connected to the second control end of the slave energy storage module 112 through an internal synchronization signal bus, achieving synchronization of the slave energy storage module 112 with the energy storage module 11 and avoiding internal circulating current.

[0065] In the embodiment, the master energy storage module and the slave energy storage module are arranged in the energy storage module, and the master energy storage module and the slave energy storage module are connected in parallel. The AC end of the master energy storage module and the slave energy storage module is connected to the AC bus and connected to the first end of the AC circuit breaker and the AC end of the charging module. The DC end of the master energy storage module and the slave energy storage module is connected to the DC bus and connected to the second end of the DC contactor. The first control end of the master energy storage module and the slave energy storage module is connected to the aging control terminal through the second controller local area network bus, and the second control end of the master energy storage module is connected to the second control end of the slave energy storage module through the synchronization signal bus. By arranging the master energy storage module and the slave energy storage module, the aging efficiency is improved.

[0066] As an optional implementation, the charging module 12 is configured to provide a constant DC voltage to the master energy storage module 111 when the DC contactor K2 is closed.

[0067] Optionally, continuing to refer to Figure 3 In the aging test preparation stage, the aging control terminal 13 sets the output voltage amplitude and the rated output power of the charging module 12 and turns on the charging module 12, and closes the DC contactor K2, at this time, the master energy storage module 111 and the slave energy storage module 112 are both in the closed state. Before turning on the master energy storage module 111, the DC contactor K2 is closed, so that the charging module 12 serves as a DC source on the DC bus and provides a constant DC voltage to the master energy storage module 111. For example, when the charging module 12 is turned on, the output voltage amplitude can be 790V, and the rated output power can be 200W, that is, when the charging module 12 is turned on and the DC contactor K2 is closed, the charging module 12 provides a constant DC voltage of 790V to the master energy storage module 111.

[0068] After the master energy storage module 111 is turned on, the aging control terminal 13 controls the DC contactor K2 to be disconnected.

[0069] Optionally, when the charging module 12 serves as a DC source on the DC bus and provides a constant DC voltage to the master energy storage module 111, the aging control terminal 13 controls the master energy storage module 111 to be turned on and the DC contactor K2 to be disconnected, at this time, the charging module 12 and the master energy storage module 111 are both in the open state, and because the DC contactor K2 is disconnected, the master energy storage module 111 serves as a DC source on the DC bus and provides a constant DC voltage to the slave energy storage module 112.

[0070] In this embodiment, when the charging module is turned on and the DC contactor is closed, the charging module serves as a DC source on the DC bus and provides a constant DC voltage to the master energy storage module. When the master energy storage module is turned on, the aging control terminal disconnects the DC contactor to cut off the connection between the charging module and the DC bus, and the master energy storage module serves as a DC source on the DC bus and provides a constant DC voltage to the slave energy storage module. The aging control terminal switches the DC source on the DC bus by controlling the on-off of the DC contactor.

[0071] As an optional implementation, the control mode of the master energy storage module 111 is a constant voltage mode at the DC end, and the control mode of the slave energy storage module 112 is a constant power mode at the AC end.

[0072] Optionally, before being turned on, the master energy storage module 111 performs self-module detection. If the amplitude of the DC voltage of the master energy storage module 111 is within a preset DC voltage interval, the amplitude of the AC voltage is within a preset AC voltage interval, and the fault identifier of the master energy storage module 111 indicates that the master energy storage module 111 is fault-free, the aging control terminal sets the control mode of the master energy storage module 111 to the constant voltage mode at the DC end, and the master energy storage module 111 outputs a constant DC voltage in the constant voltage mode at the DC end. Illustratively, the preset DC voltage interval can be 800V-805V, and the preset AC voltage interval can be 380V-420V. The DC voltage output by the master energy storage module 111 in the constant voltage mode at the DC end can be a constant 800V, and the AC current limit value is 10A.

[0073] Correspondingly, before being turned on, the slave energy storage module 112 performs self-module detection. If the amplitude of the DC voltage of the slave energy storage module 112 is within a preset DC voltage interval, the amplitude of the AC voltage is within a preset AC voltage interval, and the fault identifier of the slave energy storage module 112 indicates that the slave energy storage module 112 is fault-free, the aging control terminal sets the control mode of the slave energy storage module 112 to the constant power mode at the AC end, and the slave energy storage module 112 outputs a constant AC active power in the constant power mode at the AC end.

[0074] The master energy storage module 111 is configured to provide a constant DC voltage to the slave energy storage module 112 through the DC bus and perform power balancing, so that the sum of the powers of the master energy storage module 111 and the slave energy storage module 112 satisfies a first preset condition.

[0075] Optionally, continuing to refer to Figure 3When the master energy storage module 111 is turned on and the DC contactor K2 is closed, the master energy storage module 111 serves as a DC source on the DC bus and provides a constant DC voltage to the slave energy storage module 112 in the constant voltage mode of the DC end, and performs power balancing when the slave energy storage module 112 is in the constant power mode of the AC end, that is, the master energy storage module 111 adjusts the AC active power of the master energy storage module 111 according to the AC active power output by the slave energy storage module 112, so that the sum of the powers of the master energy storage module 111 and the slave energy storage module 112 meets the first preset condition during the aging test process.

[0076] The first preset condition can be that the sum of the powers of the master energy storage module 111 and the slave energy storage module 112 is close to zero, that is, the three-phase AC mains connected during the aging process only provides a very small operating power loss to the aging system of the energy storage module to maintain the normal operation of the aging system of the energy storage module.

[0077] In the embodiment, the aging control terminal sets the control mode of the master energy storage module to the constant voltage mode of the DC end and sets the control mode of the slave energy storage module to the constant power mode of the AC end, so that the master energy storage module provides a constant DC voltage to the slave energy storage module in the constant voltage mode of the DC end when the master energy storage module is turned on and the DC contactor is closed, and performs power balancing when the slave energy storage module is in the constant power mode of the AC end, so that the sum of the powers of the master energy storage module and the slave energy storage module is close to zero during the aging test process. It is convenient to simultaneously perform the aging test on the master energy storage module and the slave energy storage module, and the aging efficiency is improved.

[0078] Figure 4 A third architecture diagram of the aging system of the energy storage module provided in the embodiment of the present application is shown in Figure 4 The slave energy storage module 112 includes at least one first energy storage module 1121 and at least one second energy storage module 1122.

[0079] Optionally, referring to Figure 4 The slave energy storage module 112 includes at least one first energy storage module 1121 and at least one second energy storage module 1122, wherein each first energy storage module 1121 is connected in parallel, and each second energy storage module 1122 is connected in parallel. Figure 4 For example, the slave energy storage module 112 includes one first energy storage module 1121 and two second energy storage modules 1122, and the two second energy storage modules 1122 are connected in parallel. The master energy storage module 111 and each first energy storage module 1121 and each second energy storage module 1122 are connected through the second CAN bus CAN2 for CAN communication.

[0080] The first energy storage modules 1121 are connected in parallel with the second energy storage modules 1122, the AC ends of the first energy storage modules 1121 are connected with the first end of the AC circuit breaker K1, the AC bus, the AC end of the main control energy storage module 111 and the AC end of the second energy storage modules 1122, and the DC ends of the first energy storage modules 1121 are connected with the second end of the DC contactor K2, the DC bus, the DC end of the main control energy storage module 111 and the DC end of the second energy storage modules 1122.

[0081] Optionally, continuing to refer to Figure 4 The first energy storage modules 1121 are connected in parallel with the second energy storage modules 1122, and the first energy storage modules 1121 and the second energy storage modules 1122 each include a DC end and an AC end. The DC end of each first energy storage module 1121 and the AC end of each second energy storage module 1122 are connected to the AC Bus, and are connected with the first end of the AC circuit breaker K1, the AC end of the charging module 12 and the AC end of the main control energy storage module 111. The DC end of each first energy storage module 1121 and the DC end of each second energy storage module 1122 are connected to the DC Bus, and are connected with the second end of the DC contactor K2.

[0082] The first control end of each first energy storage module 1121 and the first control end of each second energy storage module 1122 are connected to the aging control terminal 13 through the second CAN bus, and the second control end of each first energy storage module 1121 and the second control end of each second energy storage module 1122 are connected to the second control end of the main control energy storage module 111 through the synchronization signal bus.

[0083] Optionally, the first energy storage modules 1121 and the second energy storage modules 1122 each further include two control ends. The first control end of each first energy storage module 1121 and the first control end of each second energy storage module 1122 are connected with the second interface of the CAN-to-USB converter 14 through the second CAN bus CAN2 respectively, the third interface of the CAN-to-USB converter 14 is connected with the aging control terminal 13 through the USB bus, and each first energy storage module 1121 and each second energy storage module 1122 indirectly communicate with the aging control terminal 13. The second control end of each first energy storage module 1121 and the second control end of each second energy storage module 1122 are connected with the second control end of the main control energy storage module 111 through the internal synchronization signal bus, so as to perform internal synchronization of the energy storage modules 11 with the main control energy storage module 111 through the internal synchronization signal bus.

[0084] In the embodiment, each first energy storage module and each second energy storage module are arranged in the slave energy storage module, and each first energy storage module is connected with each second energy storage module in parallel. The AC end of each first energy storage module and each second energy storage module is connected with the AC bus, and is connected with the first end of the AC circuit breaker, the AC end of the charging module and the AC end of the master energy storage module. The DC end of each first energy storage module and each second energy storage module is connected with the DC bus, and is connected with the second end of the DC contactor. The first control end of each first energy storage module and each second energy storage module is connected with the aging control terminal through the second controller local area network bus, and the second control end of each first energy storage module and each second energy storage module is connected with the second control end of the master energy storage module through the synchronization signal bus. By arranging each first energy storage module and each second energy storage module, the master energy storage module, each first energy storage module and each second energy storage module can be simultaneously subjected to the aging test, and the aging efficiency is further improved.

[0085] As an optional implementation, each first energy storage module 1121 is configured to output a preset positive power in the first aging test phase and output a preset negative power in the second aging test phase under the control of the aging control terminal 13.

[0086] Optionally, the aging test comprises a first aging test phase and a second aging test phase, wherein the aging control terminal 13 controls each first energy storage module 1121 to be in the AC end constant power mode, and outputs a preset positive power in the first aging test phase and outputs a preset negative power in the second aging test phase. For example, the preset positive power can be 110 kW, and the preset negative power can be -110 kW. That is, in the first aging test phase, the positive power aging test of each first energy storage module 1121 and the negative power aging test of each second energy storage module 1122 can be simultaneously implemented.

[0087] In the first aging test phase, the aging control terminal 13 can control each first energy storage module 1121 to gradually increase to the preset positive power of 110 kW by sequentially increasing the preset power step on the basis of the AC active power of 2 kW. Correspondingly, in the second aging test phase, the aging control terminal 13 can control each first energy storage module 1121 to gradually decrease to the preset negative power of -110 kW by sequentially decreasing the preset power step on the basis of the AC active power of 110 kW, so as to avoid the step feeling generated by the power adjustment.

[0088] Each second energy storage module 1122 is configured to output a preset negative power in the first aging test phase and output a preset positive power in the second aging test phase under the control of the aging control terminal.

[0089] Optionally, the aging control terminal 13 controls each second energy storage module 1122 to be in an AC terminal constant power mode, and outputs a preset negative power in the first aging test stage and a preset positive power in the second aging test stage. That is, in the second aging test stage, negative power aging test can be performed on each first energy storage module 1121 while positive power aging test is performed on each second energy storage module 1122. In the first aging test stage, the aging control terminal 13 can control each second energy storage module 1122 to gradually decrease by a preset power step on the basis of -2 kW of AC active power, and gradually decrease to a preset negative power of -110 kW. Correspondingly, in the second aging test stage, the aging control terminal 13 can control each second energy storage module 1122 to gradually increase by a preset power step on the basis of -110 kW of AC active power, and gradually increase to a preset positive power of 110 kW.

[0090] By smoothly adjusting the AC active power output of each first energy storage module 1121 and each second energy storage module 1122, the step feeling caused by power adjustment is avoided.

[0091] In this embodiment, the aging control terminal controls the absolute values of the AC active power output by the master control energy storage module, each first energy storage module and each second energy storage module to be equal, and the values of the AC active power to be opposite in the first aging test stage and the second aging test stage, so that positive power aging test is performed on each first energy storage module while negative power aging test is performed on each second energy storage module in the first aging test stage, and negative power aging test is performed on each first energy storage module while positive power aging test is performed on each second energy storage module in the second aging test stage. The comprehensiveness and test efficiency of the aging test of each first energy storage module and each second energy storage module are improved.

[0092] As an optional implementation, if the number of first energy storage modules 1121 or second energy storage modules 1122 is greater than one, the master control energy storage module 111 sends a synchronization signal to each first energy storage module 1121 and each second energy storage module 1122 through a synchronization signal bus, and performs parallel operation processing on the master control energy storage module 111, each first energy storage module 1121 and each second energy storage module 1122 according to the synchronization signal.

[0093] Optionally, the master control energy storage module 111 determines whether to perform parallel operation processing according to the number of first energy storage modules 1121 and second energy storage modules 1122 in the slave control energy storage module 112. If the number of first energy storage modules 1121 or second energy storage modules 1122 is greater than one, the master control energy storage module 111 needs to perform parallel operation processing on the master control energy storage module 111, each first energy storage module 1121 and each second energy storage module 1122. Specifically, if the number of first energy storage modules 1121 or second energy storage modules 1122 is greater than one, the master control energy storage module 111 needs to send a synchronization signal to each first energy storage module 1121 and each second energy storage module 1122 through a synchronization signal bus, and perform parallel operation processing on the master control energy storage module 111, each first energy storage module 1121 and each second energy storage module 1122 according to the synchronization signal. Figure 4For example, the number of the first energy storage modules 1121 is one, and the number of the second energy storage modules 1122 is two. In order to avoid the internal circulation of the energy storage modules 11, the synchronization signal needs to be sent to the first energy storage module 1121 and the two second energy storage modules 1122 through the internal synchronization signal bus. According to the synchronization signal, the master control energy storage module 111, the first energy storage module 1121 and the two second energy storage modules 1122 are parallelly processed, so that the switching actions of the switching tubes in the master control energy storage module 111, the first energy storage module 1121 and the two second energy storage modules 1122 are consistent in time.

[0094] In the embodiment, the master control energy storage module determines whether to perform parallel processing according to the number of the first energy storage modules and the second energy storage modules in the slave control energy storage modules. If the number of the first energy storage modules or the second energy storage modules is greater than one, the master control energy storage module sends the synchronization signal to each first energy storage module and each second energy storage module through the synchronization signal bus, and performs parallel processing on the master control energy storage module, each first energy storage module and each second energy storage module according to the synchronization signal. The parallel processing can avoid the internal circulation of the energy storage modules, increase the number of the slave control energy storage modules, and further improve the aging test efficiency.

[0095] As an optional implementation, in the first aging test stage, the master control energy storage module 111 is configured to adjust the output power of the master control energy storage module 111 according to the preset positive power output by each first energy storage module 1121 and the preset negative power output by each second energy storage module 1122, so that the sum of the powers of the master control energy storage module 111, each first energy storage module 1121 and each second energy storage module 1122 satisfies a second preset condition.

[0096] Optionally, in the first aging test stage, the master control energy storage module 111 performs power circulation according to the preset positive power output by each first energy storage module 1121 and the preset negative power output by each second energy storage module 1122, and adjusts the output power of the master control energy storage module 111, so that the sum of the powers of the master control energy storage module 111, each first energy storage module 1121 and each second energy storage module 1122 satisfies a second preset condition. The second preset condition can be that the sum of the powers of the master control energy storage module 111, each first energy storage module 1121 and each second energy storage module 1122 is close to zero in the first aging test stage, that is, in the first aging test stage, the three-phase alternating current power supply connected only provides a very small operating power loss to the aging system of the energy storage module to maintain the normal operation of the aging system of the energy storage module.

[0097] It is worth mentioning that the aging control terminal 13 controls each first energy storage module 1121 in the slave-controlled energy storage module 112 to be started first, and controls each first energy storage module 1121 to output preset positive power in the constant power mode of the alternating current end. At this time, the master-controlled energy storage module 111 and each first energy storage module 1121 perform small power circulation, and the output power of the master-controlled energy storage module 111 is adjusted according to the preset positive power output by each first energy storage module 1121, so that the sum of the powers of the master-controlled energy storage module 111 and each first energy storage module 1121 is zero. The aging control terminal 13 controls each second energy storage module 1122 in the slave-controlled energy storage module 112 to be started, and controls each second energy storage module 1122 to output preset negative power in the constant power mode of the alternating current end. At this time, the master-controlled energy storage module 111 and each first energy storage module 1121 and each second energy storage module 1122 perform large power circulation.

[0098] In the first aging test stage, the master-controlled energy storage module performs power circulation according to the preset positive power output by each first energy storage module and the preset negative power output by each second energy storage module, and adjusts the output power of the master-controlled energy storage module, so that the sum of the powers of the master-controlled energy storage module, each first energy storage module and each second energy storage module is close to zero. The master-controlled energy storage module, each first energy storage module and each second energy storage module are subjected to aging test in the first aging test stage.

[0099] As an optional implementation, in the second aging test stage, the master-controlled energy storage module 111 is used to adjust the output power of the master-controlled energy storage module 111 according to the preset negative power output by each first energy storage module 1121 and the preset positive power output by each second energy storage module 1122, so that the sum of the powers of the master-controlled energy storage module 111, each first energy storage module 1121 and each second energy storage module 1122 satisfies a third preset condition.

[0100] Optionally, in the second aging test stage, the master-controlled energy storage module 111 performs power circulation according to the preset negative power output by each first energy storage module 1121 and the preset positive power output by each second energy storage module 1122, and adjusts the output power of the master-controlled energy storage module 111, so that the sum of the powers of the master-controlled energy storage module 111, each first energy storage module 1121 and each second energy storage module 1122 satisfies a third preset condition. The third preset condition can be that in the second aging test stage, the sum of the powers of the master-controlled energy storage module 111, each first energy storage module 1121 and each second energy storage module 1122 is close to zero, that is, in the second aging test stage, the three-phase alternating current power supply connected only provides very small operating power loss to the aging system of the energy storage module, to maintain the normal operation of the aging system of the energy storage module.

[0101] It is worth mentioning that the aging control terminal 13 controls each second energy storage module 1121 in the slave-controlled energy storage module 112 to output power of 0 kW in the AC end constant power mode first, that is, each second energy storage module 1121 is controlled to standby first, and each first energy storage module 1121 outputs preset negative power in the AC end constant power mode, at this time, the master-controlled energy storage module 111 and each first energy storage module 1121 first perform small power circulation, and the output power of the master-controlled energy storage module 111 is adjusted according to the preset negative power output by each first energy storage module 1121, so that the sum of the powers of the master-controlled energy storage module 111 and each first energy storage module 1121 is zero. The aging control terminal 13 controls each second energy storage module 1122 in the slave-controlled energy storage module 112 to output preset negative power in the AC end constant power mode, at this time, the master-controlled energy storage module 111 and each first energy storage module 1121 and each second energy storage module 1122 perform large power circulation again.

[0102] In the second aging test phase, the master-controlled energy storage module performs power circulation according to the preset negative power output by each first energy storage module and the preset positive power output by each second energy storage module, and the sum of the powers of the master-controlled energy storage module, each first energy storage module and each second energy storage module is close to zero by adjusting the output power of the master-controlled energy storage module. The master-controlled energy storage module, each first energy storage module and each second energy storage module are subjected to aging test in the second aging test phase.

[0103] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of changes or replacements within the technical range disclosed in the present application, which should be covered in the protection scope of the present application.

Claims

1. An aging system for energy storage modules, comprising: The application relates to a charging module, an alternating current circuit breaker, a direct current contactor, an energy storage module and an aging control terminal. An alternating current end of the charging module is connected with a first end of the alternating current circuit breaker and an alternating current bus, a direct current end of the charging module is connected with a first end of the direct current contactor, and a control end of the charging module is connected with the aging control terminal through a first controller area network bus. The energy storage module is connected with the charging module in parallel through the direct current contactor, an alternating current end of the energy storage module is connected with the first end of the alternating current circuit breaker and the alternating current bus, a direct current end of the energy storage module is connected with a second end of the direct current contactor and a direct current bus, and a control end of the energy storage module is connected with the aging control terminal through a second controller area network bus. The aging control terminal is used for controlling working states of the charging module and the energy storage module and on-off states of the direct current contactor and the alternating current circuit breaker, so that the energy storage module is subjected to aging test. The energy storage module comprises a master energy storage module and a slave energy storage module.

2. The system of claim 1, wherein, The master energy storage module is connected with the slave energy storage module in parallel, an alternating current end of the master energy storage module is connected with a first end of the alternating current circuit breaker, an alternating current bus and an alternating current end of the slave energy storage module, and a direct current end of the master energy storage module is connected with a second end of the direct current contactor, a direct current bus and a direct current end of the slave energy storage module. A first control end of the master energy storage module and a first control end of the slave energy storage module are connected with the aging control terminal through the second controller area network bus, and a second control end of the master energy storage module is connected with a second control end of the slave energy storage module through a synchronous signal bus. The master energy storage module is used for providing a constant direct current voltage to the slave energy storage module through the direct current bus, and power balance is performed, so that the sum of powers of the master energy storage module and the slave energy storage module satisfies a first preset condition.

3. The system of claim 2, wherein, The slave energy storage module comprises at least one first energy storage module and at least one second energy storage module. Each first energy storage module and each second energy storage module are connected in parallel, an alternating current end of each first energy storage module is connected with a first end of the alternating current circuit breaker, an alternating current bus, an alternating current end of the master energy storage module and an alternating current end of each second energy storage module, a direct current end of each first energy storage module is connected with a second end of the direct current contactor, a direct current bus, a direct current end of the master energy storage module and a direct current end of each second energy storage module.

4. The system of claim 2, wherein, A first control end of each first energy storage module and a first control end of each second energy storage module are connected with the aging control terminal through the second controller area network bus, and a second control end of each first energy storage module and a second control end of each second energy storage module are connected with the second control end of the master energy storage module through the synchronous signal bus. ​ ​ 5. The system of claim 4, wherein, Each of the first energy storage modules is configured to output preset forward power in a first aging test phase and output preset reverse power in a second aging test phase under control of the aging control terminal. Each of the second energy storage modules is configured to output the preset reverse power in the first aging test phase and output the preset forward power in the second aging test phase under control of the aging control terminal.

6. The system of claim 4, wherein, If the number of the first energy storage modules or the second energy storage modules is greater than one, the master energy storage module sends a synchronization signal to each of the first energy storage modules and each of the second energy storage modules through the synchronization signal bus, and performs parallel processing on the master energy storage module, each of the first energy storage modules and each of the second energy storage modules according to the synchronization signal.

7. The system of claim 2, wherein, The charging module is configured to provide a constant direct current voltage to the master energy storage module when the direct current contactor is closed. After the master energy storage module is turned on, the aging control terminal controls the direct current contactor to be opened.

8. The system of claim 5, wherein, In the first aging test phase, the master energy storage module is configured to adjust output power of the master energy storage module according to the preset forward power output by each of the first energy storage modules and the preset reverse power output by each of the second energy storage modules, so that the sum of the power of the master energy storage module, each of the first energy storage modules and each of the second energy storage modules satisfies a second preset condition.

9. The system of claim 5, wherein, In the second aging test phase, the master energy storage module is configured to adjust output power of the master energy storage module according to the preset reverse power output by each of the first energy storage modules and the preset forward power output by each of the second energy storage modules, so that the sum of the power of the master energy storage module, each of the first energy storage modules and each of the second energy storage modules satisfies a third preset condition.

10. The system of claim 1, wherein, The aging system of the energy storage module further comprises a controller area network to universal serial bus converter. A first interface of the controller area network to universal serial bus converter is connected to the charging module through the first controller area network bus, a second interface of the controller area network to universal serial bus converter is connected to the energy storage module through the second controller area network bus, and a third interface of the controller area network to universal serial bus converter is connected to the aging control terminal through a universal serial bus. The controller area network to universal serial bus converter is configured to convert between universal serial bus signals and controller area network signals.

Images