Test apparatus and charging system

Abstract

The present disclosure relates to the technical field of charging and discharging tests, and in particular to a test apparatus and a charging system. The test apparatus is used for performing charging and discharging tests on a first storage and charging device and a second storage and charging device, wherein the first storage and charging device is provided with a first charging interface, and the second storage and charging device is provided with a second charging interface. The test apparatus comprises: a connection unit, adapted to be connected to power interfaces in the first charging interface and the second charging interface, so that the first storage and charging device and the second storage and charging device are electrically connected; and a test control unit, adapted to be connected to signal interfaces in the first charging interface and the second charging interface, to communicate with the first storage and charging device and the second storage and charging device separately, so as to control the first storage and charging device and the second storage and charging device to undergo charging and discharging tests. In this way, two storage and charging devices are electrically connected by means of the test apparatus, and the test apparatus communicates with the two storage and charging devices to control the two storage and charging devices to perform charging and discharging, so that bidirectional charging and discharging tests for the two storage and charging devices can be realized, the tests are convenient, and the cost is low.

Description

Testing equipment and charging system

[0001] This disclosure claims priority to Chinese patent application No. 202421598488.8, filed on July 8, 2024, entitled “Testing Apparatus and Charging System”, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This disclosure relates to the field of charge and discharge testing technology, specifically to a testing device and a charging system. Background Technology

[0003] Currently, when maintaining and debugging high-power charging piles, it is necessary to simulate high-power charging, which results in large-sized and costly simulation equipment, making it difficult to conduct on-site maintenance and debugging.

[0004] Public content

[0005] In view of the above problems, this disclosure provides a testing device and a charging system. The testing device electrically connects two energy storage and charging devices and controls the charging and discharging of the two devices by communicating with them. This enables bidirectional charging and discharging testing of the two energy storage and charging devices. The testing is convenient, small in size, and low in cost, which is beneficial for on-site maintenance and debugging.

[0006] In a first aspect, this disclosure provides a testing apparatus for performing charge-discharge tests on a first charging device and a second charging device. The first charging device has a first charging interface, and the second charging device has a second charging interface. The apparatus includes: a connection unit adapted to connect to a power interface in the first charging interface and a power interface in the second charging interface to electrically connect the first charging device and the second charging device; and a test control unit adapted to connect to a signal interface in the first charging interface and a signal interface in the second charging interface to communicate with the first charging device and the second charging device respectively, so as to control the first charging device and the second charging device to perform charge-discharge tests.

[0007] In the technical solution of this disclosure embodiment, a connection unit connects the power interfaces of the charging interfaces of two energy storage devices to electrically connect the two devices. A test control unit is connected to the signal interfaces of the charging interfaces of the two devices to communicate with each device and control them to perform charge / discharge tests. Thus, by electrically connecting the two devices through a test device and controlling their charge / discharge through communication, bidirectional charge / discharge testing of the two devices can be achieved. The testing is convenient, and the test device is small and low-cost, which is beneficial for on-site maintenance and debugging.

[0008] In some embodiments, during charge / discharge testing, the first charging device is in charging mode and the second charging device is in V2X mode to perform charging function testing on the first charging device and V2X function testing on the second charging device; or, the second charging device is in charging mode and the first charging device is in V2X mode to perform charging function testing on the second charging device and V2X function testing on the first charging device. Thus, the testing device can be used to test both the charging function and V2X function of the charging devices.

[0009] In some embodiments, the first energy storage and charging device includes a first energy storage unit and a first power conversion unit. The first energy storage unit is electrically connected to a DC bus, and the first power conversion unit is electrically connected to both the DC bus and the power interface in the first charging interface. The second energy storage and charging device includes a second energy storage unit and a second power conversion unit. The second energy storage unit is electrically connected to the DC bus, and the second power conversion unit is electrically connected to both the DC bus and the power interface in the second charging interface. When the first energy storage and charging device is in charging mode and the second energy storage and charging device is in V2V mode, the electrical energy of the first energy storage unit is sequentially transmitted to the second energy storage unit via the DC bus, the first power conversion unit, the first charging interface, the connection unit, the second charging interface, the second power conversion unit, and the DC bus. When the second energy storage and charging device is in charging mode and the first energy storage and charging device is in V2V mode, the electrical energy of the second energy storage unit is sequentially transmitted to the first energy storage unit via the DC bus, the second power conversion unit, the second charging interface, the connection unit, the first charging interface, the first power conversion unit, and the DC bus. Thus, the charging function and V2V function of the energy storage and charging equipment can be tested through the testing device, and since the two energy storage and charging equipment share a DC bus, the test can be carried out without an AC power grid.

[0010] In some embodiments, the first energy storage unit is electrically connected to the DC bus via a first switch, and the second energy storage unit is electrically connected to the DC bus via a second switch. The first energy storage and charging device further includes a third power conversion unit, which is electrically connected to both the DC bus and the AC power grid. The second energy storage and charging device further includes a fourth power conversion unit, which is also electrically connected to both the DC bus and the AC power grid. When the first energy storage and charging device is in charging mode and the second energy storage and charging device is in V2G mode, the first switch is turned on, and the electrical energy of the first energy storage unit is transmitted to the AC power grid sequentially through the DC bus, the first power conversion unit, the first charging interface, the connection unit, the second charging interface, the second power conversion unit, the DC bus, and the fourth power conversion unit. When the second energy storage and charging device is in charging mode and the first energy storage and charging device is in V2G mode, the second switch is turned on, and the electrical energy of the second energy storage unit is transmitted to the AC power grid sequentially through the DC bus, the second power conversion unit, the second charging interface, the connection unit, the first charging interface, the first power conversion unit, the DC bus, and the third power conversion unit. Thus, the V2G function of the energy storage and charging device can be tested using the testing device.

[0011] In some embodiments, the first charging device further includes a third switch, which is connected to both the DC bus and the power interface in the first charging interface. The second charging device further includes a fourth switch, which is connected to both the DC bus and the power interface in the second charging interface. When the first charging device is in charging mode and the second charging device is in V2G mode, the fourth switch is on and the second power conversion unit is not working, or the fourth switch is off and the second power conversion unit is working. When the second charging device is in charging mode and the first charging device is in V2G mode, the third switch is on and the first power conversion unit is not working, or the third switch is off and the first power conversion unit is working. This allows for V2G testing of the charging devices for different pathways.

[0012] In some embodiments, the DC bus is also adapted to connect an energy storage supplementation device. When the first energy storage device is in charging mode and the second energy storage device is in V2L mode, the first switch is turned on, and the electrical energy of the first energy storage unit is sequentially transmitted to the energy storage supplementation device via the DC bus, the first power conversion unit, the first charging interface, the connection unit, the second charging interface, the second power conversion unit, and the DC bus. When the second energy storage device is in charging mode and the first energy storage device is in V2L mode, the second switch is turned on, and the electrical energy of the second energy storage unit is sequentially transmitted to the energy storage supplementation device via the DC bus, the second power conversion unit, the second charging interface, the connection unit, the first charging interface, the first power conversion unit, and the DC bus. This allows for the testing of the V2L function of the energy storage device.

[0013] In some embodiments, the connection unit includes a positive power line and a negative power line. The two ends of the positive power line are adapted to connect to the positive power interface in the first charging interface and the positive power interface in the second charging interface. The two ends of the negative power line are adapted to connect to the negative power interface in the first charging interface and the negative power interface in the second charging interface. Thus, the connection unit allows for quick and convenient electrical connection between two energy storage and charging devices, and its structure is simple and low-cost.

[0014] In some embodiments, the test control unit includes a communication component that supports multiple communication protocols to enable the test control unit to communicate with different first and second charging devices. This improves the communication capabilities of the test control unit.

[0015] In some embodiments, the first charging device includes a first control unit, the second charging device includes a second control unit, and the test control unit communicates with the first control unit and the second control unit respectively to control the first charging device and the second charging device to perform charge and discharge tests.

[0016] Secondly, this disclosure provides a charging system, including: a first charging device having a first charging interface; a second charging device having a second charging interface; when performing charge and discharge tests on the first charging device and the second charging device, the aforementioned test device is used to connect the first charging interface and the second charging interface to perform charge and discharge tests on the first charging device and the second charging device.

[0017] The above description is merely an overview of the technical solution disclosed herein. In order to better understand the technical means of this disclosure and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this disclosure more apparent and understandable, specific embodiments of this disclosure are described below. Attached Figure Description

[0018] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this disclosure. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0019] Figure 1 is a schematic diagram of the structure of the test device according to the first embodiment of this disclosure.

[0020] Figure 2 is a schematic diagram of the structure of the test device according to the second embodiment of this disclosure.

[0021] Figure 3 is a schematic diagram of the test apparatus according to the third embodiment of this disclosure.

[0022] Figure 4 is a schematic diagram of the test device according to the fourth embodiment of this disclosure.

[0023] Figure 5 is a schematic diagram of the test apparatus according to the fifth embodiment of this disclosure.

[0024] Figure 6 is a schematic diagram of the test apparatus according to the sixth embodiment of this disclosure.

[0025] Figure 7 is a schematic diagram of the control unit of a storage and charging device according to an embodiment of the present disclosure. Detailed Implementation

[0026] The embodiments of the technical solutions disclosed herein will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the technical solutions disclosed herein and are therefore intended to limit the scope of protection of this disclosure.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this disclosure; the terms “comprising” and “having”, and any variations thereof, in the specification, claims and foregoing description of the drawings of this disclosure are intended to cover non-exclusive inclusion.

[0028] In the description of the embodiments of this disclosure, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary or secondary relationship of the indicated technical features. In the description of the embodiments of this disclosure, "a plurality of" means two or more, unless otherwise explicitly defined.

[0029] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this disclosure. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0030] In the description of the embodiments of this disclosure, the term "and / or" is merely a description of the relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following associated objects have an "or" relationship.

[0031] In the description of the embodiments of this disclosure, the term "multiple" refers to two or more (including two), similarly, "multiple groups" refers to two or more (including two groups), and "multiple pieces" refers to two or more (including two pieces).

[0032] In the description of the embodiments of this disclosure, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this disclosure and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this disclosure.

[0033] In the description of the embodiments of this disclosure, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this disclosure according to the specific circumstances.

[0034] Currently, maintenance and debugging of high-power charging piles require simulating high-power charging, resulting in large and costly simulation equipment that is inconvenient for on-site maintenance and debugging. For example, a dedicated high-power simulation device is needed to test the high-power charging pile. When maintenance and debugging of the high-power charging pile are required, this high-power simulation device needs to be transported to the site and then used to perform maintenance and debugging. However, because the simulation device is a high-power device, its large size is inconvenient for on-site maintenance and debugging, and it also incurs high costs.

[0035] Based on this, the present disclosure provides a testing device that electrically connects two energy storage and charging devices and controls their charging and discharging by communicating with them. This not only enables bidirectional charging and discharging testing of the two energy storage and charging devices, but also, since the testing device is mainly used to realize the electrical and communication connection between the two energy storage and charging devices, as well as the corresponding test control, it is convenient to test, small in size, and low in cost, thus facilitating on-site maintenance and debugging.

[0036] The testing apparatus disclosed in this embodiment can be used to perform charge and discharge tests on high-power energy storage and charging devices, as well as on low-power energy storage and charging devices, thus having a wide range of applications. The energy storage and charging devices can be charging piles, integrated energy storage and charging machines, etc., and can be used to charge high-power devices requiring fast / supercharging, such as electric vehicles, electric ships, and power tools, as well as devices that do not require fast / supercharging, such as electric vehicles, electric ships, and power tools.

[0037] The testing apparatus of this disclosure will now be described in conjunction with specific embodiments.

[0038] Figure 1 is a schematic diagram of the structure of a test apparatus 100 according to an embodiment of the present disclosure.

[0039] Referring to Figure 1, the testing device 100 is used to perform charge and discharge tests on the first charging device 200 and the second charging device 300. The first charging device 200 has a first charging interface 210, and the second charging device 300 has a second charging interface 310.

[0040] The testing device 100 may include a connection unit 110 and a test control unit 120. The connection unit 110 is adapted to connect to the power interface in the first charging interface 210 and the power interface in the second charging interface 310, so that the first charging storage device 200 and the second charging storage device 300 are electrically connected. The test control unit 120 is adapted to connect to the signal interface in the first charging interface 210 and the signal interface in the second charging interface 310, so as to communicate with the first charging storage device 200 and the second charging storage device 300 respectively, and control the first charging storage device 200 and the second charging storage device 300 to perform charge and discharge tests.

[0041] Specifically, the connection unit 110 is mainly used to realize the electrical connection between the first charging device 200 and the second charging device 300. Specifically, it can electrically connect the power interfaces in the first charging interface 210 and the second charging interface 310 to realize the flow of electrical energy between the first charging device 200 and the second charging device 300. The test control unit 120 is mainly used to communicate with the first charging device 200 and the second charging device 300. Specifically, it can be connected to the signal interfaces in the first charging interface 210 and the second charging interface 310 respectively to send test commands to the first charging device 200 and the second charging device 300 to realize the charge and discharge test of the first charging device 200 and the second charging device 300.

[0042] For example, during testing, the first charging device 200 can be controlled to be in a discharging state, and the second charging device 300 can be controlled to be in a charging state, so as to test the charging function of the first charging device 200; or, the second charging device 300 can be controlled to be in a discharging state, and the first charging device 200 can be controlled to be in a charging state, so as to test the charging function of the second charging device 300.

[0043] In the above embodiments, the testing device is mainly used to establish an electrical connection between the two energy storage and charging devices, as well as a communication connection with them, so as to send test commands to the two devices and control their charging and discharging, thereby realizing the charging and discharging test of the two devices. Since the testing device is mainly used for electrical and communication connections and command issuance, it does not require other equipment such as high-voltage batteries or high-power converters. Therefore, it is small in size and low in cost. Furthermore, during testing, simply connecting the charging interfaces of the two energy storage and charging devices to the testing device is sufficient, making operation convenient and facilitating on-site maintenance and debugging.

[0044] It is understandable that the first charging interface 210 and the second charging interface 310 usually use standard charging interfaces, which have power interfaces and signal interfaces. Therefore, interfaces that match the standard charging interfaces can be set on the housing of the test device 100. In this way, during testing, the first charging interface 210 and the second charging interface 310 can be directly connected to the interfaces of the test device 100, making the operation more convenient.

[0045] For example, referring to FIG2, the testing device 100 further includes a first interface 130 and a second interface 140. The first interface 130 is matched with the first charging interface 210, and the second interface 140 is matched with the second charging interface 310. During testing, the first charging interface 210 is connected to the first interface 130, and the second charging interface 310 is connected to the second interface 140. The operation is simple and easy to disassemble.

[0046] It should be noted that the first interface 130 and the second interface 140 can be embedded inside the housing of the test device 100 or protrude from the housing of the test device 100, and there is no restriction on the specific setting position.

[0047] In some embodiments, referring to FIG1, the connection unit 110 includes a positive power line (+) and a negative power line (-). The two ends of the positive power line are adapted to connect to the positive power interface in the first charging interface 210 and the positive power interface in the second charging interface 310. The two ends of the negative power line are adapted to connect to the negative power interface in the first charging interface 210 and the negative power interface in the second charging interface 310.

[0048] In this embodiment, the connection unit consists of two power lines, which can be used to electrically connect two energy storage and charging devices for charging and discharging tests. No other equipment such as high-voltage batteries or high-power converters is required, resulting in a simple structure and low cost.

[0049] In some embodiments, during charge / discharge testing, the first charging device 200 is in charging mode and the second charging device 300 is in V2X mode, so as to perform charging function testing on the first charging device 200 and V2X function testing on the second charging device 300; or, the second charging device 300 is in charging mode and the first charging device 200 is in V2X mode, so as to perform charging function testing on the second charging device 300 and V2X function testing on the first charging device 200.

[0050] It should be noted that charging mode refers to the discharge of energy from the corresponding energy storage device. V2X (Vehicle to X) mode refers to the mode in which the energy storage device transfers electrical energy from a vehicle to other devices, including but not limited to V2V (Vehicle to Vehicle), V2G (Vehicle to Grid), V2L (Vehicle to Load), and V2H (Vehicle to Home) modes, specifically determined by the structure and function of the two energy storage devices and the other devices connected to them. For example, an energy storage device with an energy storage unit can achieve V2V mode; an energy storage device connected to the grid can achieve V2G mode; an energy storage device connected to a load can achieve V2L mode; and an energy storage device connected to a user can achieve V2H mode.

[0051] Taking the V2V mode implementation of a charging and storage device as an example, the test control unit 120 can control the first charging and storage device 200 to be in charging mode, and simultaneously control the second charging and storage device 300 to be in V2V mode. In this mode, the first charging and storage device 200 discharges, and the energy is transferred to the second charging and storage device 300 through the first charging interface 210, the connection unit 110, and the second charging interface 310. The second charging and storage device 300 then charges its internal energy storage unit based on the electrical energy released by the first charging and storage device 200. Relative to the first charging and storage device 200, the second charging and storage device 300 is equivalent to a vehicle, thus enabling the testing of the charging function of the first charging and storage device 200; relative to the second charging and storage device 300, the first charging and storage device 200 is equivalent to a vehicle, thus enabling the testing of the V2V function of the second charging and storage device 300.

[0052] Similarly, the test control unit 120 can control the second energy storage device 300 to be in charging mode, while simultaneously controlling the first energy storage device 200 to be in V2V mode. In this mode, the second energy storage device 300 discharges and transmits the energy to the first energy storage device 200 through the second charging interface 310, the connection unit 110, and the first charging interface 210. The first energy storage device 200 then charges its internal energy storage unit based on the electrical energy released by the second energy storage device 300. Relative to the second energy storage device 300, the first energy storage device 200 is analogous to a vehicle, thus enabling testing of the charging function of the second energy storage device 300; similarly, relative to the first energy storage device 200, the second energy storage device 300 is analogous to a vehicle, thus enabling testing of the V2V function of the first energy storage device 200.

[0053] It should be noted that for explanations of other V2X modes, please refer to the explanations of V2V modes; details will not be repeated here.

[0054] In this embodiment, based on the testing device, the charging function of one storage and charging device and the V2X function of another storage and charging device can be tested in one test, and the charging function and V2X function of two storage and charging devices can be tested in two tests, which is fast.

[0055] In some embodiments, the test control unit 120 includes a communication component that supports multiple communication protocols to enable the test control unit 102 to communicate with different first charging devices 200 and second charging devices 300, thereby improving the versatility of the test control unit 120.

[0056] For example, the communication component supports standard charging protocols and standard V2X protocols, such as national standards, so that the test control unit 120 can communicate with the corresponding charging and storage devices using standard charging protocols and standard V2X protocols. Alternatively, the communication component supports user-customized charging protocols and V2X protocols so that the test control unit 102 can meet actual needs.

[0057] Taking the V2V mode implementation of the charging and storage device as an example, the test control unit 120 can simulate the vehicle's BMS (Battery Management System) and communicate with the first charging and storage device 200 according to the national standard charging protocol to send corresponding test commands to the first charging and storage device 200. These test commands include, but are not limited to, the charging mode (trickle charging, constant voltage charging, etc.), charging voltage, charging current, and charging power of the first charging and storage device 200. At the same time, the test control unit 120 can simulate the vehicle's BMS and communicate with the second charging and storage device 300 according to the national standard V2V protocol to send corresponding test commands to the second charging and storage device 300. These test commands include, but are not limited to, the V2V mode, V2V voltage, V2V current, and V2V power of the second charging and storage device 300, and the charging parameters are consistent with the V2V parameters to verify the charging function of the first charging and storage device 200 and the V2V function of the second charging and storage device 300. During the verification process, the first storage and charging device 200 and the second storage and charging device 300 can send the working data during the test to the test control unit 120, which will analyze and process the data and generate a test report, etc. The specifics are not limited here.

[0058] Similarly, the test control unit 120 can simulate the vehicle's BMS and communicate with the second charging device 300 according to the national standard charging protocol to send corresponding test commands to the second charging device 300; at the same time, the test control unit 120 can simulate the vehicle's BMS and communicate with the first charging device 200 according to the national standard V2V protocol to send corresponding test commands to the first charging device 200 to verify the charging function of the second charging device 300 and the V2V function of the first charging device 200.

[0059] For example, referring to FIG2, the test control unit 120 may include a controller 123 and a communication component. The communication component includes a first communication component 121 and a second communication component 122. Both the first communication component 121 and the second communication component 122 support multiple communication protocols, such as the national standard charging protocol and the national standard V2X protocol.

[0060] During charging and discharging tests, the controller 123 can simulate the vehicle's BMS and communicate with the first charging and storage device 200 through the first communication component 121 according to the national standard charging protocol, so as to send the corresponding test commands to the first charging and storage device 200; at the same time, the controller 123 can simulate the vehicle's BMS and communicate with the second charging and storage device 300 through the second communication component 122 according to the national standard V2V protocol, so as to send the corresponding test commands to the second charging and storage device 300.

[0061] Similarly, the controller 123 can simulate the vehicle's BMS and communicate with the second charging device 300 through the second communication component 122 according to the national standard charging protocol to send the corresponding test commands to the second charging device 300; at the same time, the controller 123 can simulate the vehicle's BMS and communicate with the first charging device 200 through the first communication component 121 according to the national standard V2V protocol to send the corresponding test commands to the first charging device 200 to verify the charging function of the second charging device 300 and the V2V function of the first charging device 200.

[0062] It should be noted that when the energy storage and charging equipment implements V2G mode, the test control unit 120 will simulate the power grid and communicate with the corresponding energy storage and charging equipment according to the national standard V2G protocol; when the energy storage and charging equipment implements V2L mode, the test control unit 120 will simulate the load and communicate with the corresponding energy storage and charging equipment according to the national standard V2L protocol; when the energy storage and charging equipment implements V2H mode, the test control unit 120 will simulate user data devices and communicate with the corresponding energy storage and charging equipment according to the national standard V2H protocol.

[0063] It should be noted that the specific agreements mentioned above can be selected based on the actual situation, and no restrictions are imposed here.

[0064] In the above embodiments, the testing device incorporates different communication protocols and communicates with the storage and charging equipment based on these protocols to issue test commands and meet the corresponding testing requirements.

[0065] In some embodiments, referring to FIG3, the first energy storage and charging device 200 includes a first energy storage unit 220 and a first power conversion unit 230. The first energy storage unit 220 is electrically connected to the DC bus, and the first power conversion unit 230 is electrically connected to the DC bus and the power interface in the first charging interface 210, respectively. The second energy storage and charging device 300 includes a second energy storage unit 320 and a second power conversion unit 330. The second energy storage unit 320 is electrically connected to the DC bus, and the second power conversion unit 330 is electrically connected to the DC bus and the power interface in the second charging interface 310, respectively.

[0066] When the first energy storage device 200 is in charging mode and the second energy storage device 300 is in V2V mode, the electrical energy of the first energy storage unit 220 is transmitted to the second energy storage unit 320 sequentially through the DC bus, the first power conversion unit 230, the first charging interface 210, the connection unit 110, the second charging interface 310, the second power conversion unit 330, and the DC bus; when the second energy storage device 300 is in charging mode and the first energy storage device 200 is in V2V mode, the electrical energy of the second energy storage unit 320 is transmitted to the first energy storage unit 220 sequentially through the DC bus, the second power conversion unit 330, the second charging interface 310, the connection unit 110, the first charging interface 210, the first power conversion unit 230, and the DC bus.

[0067] It should be noted that the first energy storage unit 220 and the second energy storage unit 320 may include one or more battery cells. Multiple battery cells may be connected in series, in parallel, or in a series-parallel connection. Each battery cell may be a single cell, or multiple single cells connected in series, in parallel, or in a series-parallel connection. In some embodiments, the first energy storage unit 220 and the second energy storage unit 320 may further include a battery management unit that communicates with the corresponding power conversion unit to exchange relevant data.

[0068] The first power conversion unit 230 and the second power conversion unit 330 may include a bidirectional DC-DC conversion circuit, such as a BUCK-BOOST circuit with power factor correction.

[0069] During testing, the test control unit 120 can control the first power conversion unit 230 to operate, converting the first electrical energy from the first energy storage unit 220 into second electrical energy, which is then transmitted to the second power conversion unit 330 via the first charging interface 210, the connection unit 110, and the second charging interface 310. Simultaneously, the test control unit 120 controls the second power conversion unit 330 to operate, converting the second electrical energy into third electrical energy to charge the second energy storage unit 320. At this time, relative to the first energy storage and charging device 200, the second energy storage and charging device 300 is equivalent to a vehicle, the second power conversion unit 330 is equivalent to an on-board charger, and the second energy storage unit 320 is equivalent to a power battery. Therefore, the charging function of the first energy storage and charging device 200 can be tested, such as charging a vehicle. Simultaneously, relative to the second energy storage and charging device 300, the first energy storage and charging device 200 is equivalent to a vehicle, and the first energy storage unit 220 is equivalent to a power battery, providing electrical energy to the second energy storage and charging device 300, enabling the second energy storage and charging device 300 to perform V2V function testing.

[0070] It should be noted that since the first energy storage device 200 and the second energy storage device 300 share the same DC bus, the third power can also be transmitted to the first power conversion unit 230, but this does not affect the test.

[0071] Similarly, the test control unit 120 can control the second power conversion unit 330 to operate, converting the first electrical energy of the second energy storage unit 320 into second electrical energy, which is then transmitted to the first power conversion unit 230 through the second charging interface 310, the connection unit 110, and the first charging interface 210. Simultaneously, the test control unit 120 controls the first power conversion unit 230 to operate, converting the second electrical energy into third electrical energy to charge the first energy storage unit 220. At this time, relative to the second energy storage and charging device 300, the first energy storage and charging device 200 is equivalent to a vehicle, the first power conversion unit 230 is equivalent to an on-board charger, and the first energy storage unit 220 is equivalent to a power battery. Therefore, the charging function of the second energy storage and charging device 300 can be tested, such as charging a vehicle. At the same time, relative to the first energy storage and charging device 200, the second energy storage and charging device 300 is equivalent to a vehicle, and the second energy storage unit 320 is equivalent to a power battery, providing electrical energy to the first energy storage and charging device 200, enabling the first energy storage and charging device 200 to perform V2V function testing.

[0072] It should be noted that since the first energy storage device 200 and the second energy storage device 300 share the same DC bus, the third power can also be transmitted to the second power conversion unit 330, but this does not affect the test.

[0073] In this embodiment, not only can the charging function and V2V function of the energy storage and charging device be tested, but also, since the two energy storage and charging devices share a DC bus, the test can be carried out without an AC power grid.

[0074] In some embodiments, referring to FIG4, the first energy storage unit 220 is electrically connected to the DC bus via a first switch K1, the second energy storage unit 320 is electrically connected to the DC bus via a second switch K2, the first energy storage and charging device 200 further includes a third power conversion unit 240, which is electrically connected to the DC bus and the AC power grid respectively, and the second energy storage and charging device 300 further includes a fourth power conversion unit 340, which is electrically connected to the DC bus and the AC power grid respectively.

[0075] When the first energy storage device 200 is in charging mode and the second energy storage device 300 is in V2G mode, the first switch K1 is turned on, and the electrical energy of the first energy storage unit 220 is transmitted to the AC power grid sequentially through the DC bus, the first power conversion unit 230, the first charging interface 210, the connection unit 110, the second charging interface 310, the second power conversion unit 330, the DC bus, and the fourth power conversion unit 340. When the second energy storage device 300 is in charging mode and the first energy storage device 200 is in V2G mode, the second switch K2 is turned on, and the electrical energy of the second energy storage unit 320 is transmitted to the AC power grid sequentially through the DC bus, the second power conversion unit 330, the second charging interface 310, the connection unit 110, the first charging interface 210, the first power conversion unit 230, the DC bus, and the third power conversion unit 240.

[0076] It should be noted that the third power conversion unit 240 and the fourth power conversion unit 340 may include bidirectional AC-DC conversion circuits. For example, when the AC power grid is a three-phase four-wire power supply, it may be a bidirectional three-phase four-wire rectifier circuit; when the AC power grid is a three-phase three-wire power supply, it may be a bidirectional three-phase three-wire rectifier circuit; and when the AC power grid is a single-phase power supply, it may be a bidirectional single-phase rectifier circuit.

[0077] During testing, the test control unit 120 can control the first switch K1 to close and control the first power conversion unit 230 to operate, converting the first electrical energy from the first energy storage unit 220 into second electrical energy, which is then transmitted to the second power conversion unit 330 through the first charging interface 210, the connection unit 110, and the second charging interface 310. Simultaneously, the test control unit 120 controls the second switch K2 to open and controls the second power conversion unit 330 and the fourth power conversion unit 340 to operate, feeding the second electrical energy to the AC power grid. At this time, relative to the first energy storage and charging device 200, the second energy storage and charging device 300 is equivalent to a vehicle, thus enabling testing of the charging function of the first energy storage and charging device 200, such as charging a vehicle; simultaneously, relative to the second energy storage and charging device 300, the first energy storage and charging device 200 is equivalent to a vehicle, allowing the second energy storage and charging device 300 to perform V2G function testing.

[0078] It should be noted that in this example, the test control unit 120 can also control the second switch K2 to close and control the second power conversion unit 330 to operate, so as to test the V2V function of the second energy storage device 300. That is to say, in this example, both the V2V function and the V2G function can be tested on the second energy storage device 300.

[0079] Similarly, the test control unit 120 can control the second switch K2 to close and control the second power conversion unit 330 to operate, so as to convert the first electrical energy of the second energy storage unit 320 into second electrical energy, which is then transmitted to the first power conversion unit 230 through the second charging interface 310, the connection unit 110, and the first charging interface 210. At the same time, the test control unit 120 controls the first switch K1 to open and controls the first power conversion unit 230 and the third power conversion unit 240 to operate, so as to feed the second electrical energy to the AC power grid. At this time, relative to the second energy storage and charging device 300, the first energy storage and charging device 200 is equivalent to a vehicle, so the charging function of the second energy storage and charging device 300 can be tested, such as charging a vehicle; at the same time, relative to the first energy storage and charging device 200, the second energy storage and charging device 300 is equivalent to a vehicle, so that the first energy storage and charging device 200 can perform V2V function testing.

[0080] It should be noted that in this example, the test control unit 120 can also control the first switch K1 to close and control the first power conversion unit 230 to operate, so as to test the V2V function of the first energy storage device 200. That is to say, in this example, both the V2V function and the V2G function can be tested on the first energy storage device 200.

[0081] In this embodiment, the charging function, V2V and V2G functions of the energy storage device can be tested.

[0082] In some embodiments, referring to FIG5, the first energy storage and charging device 200 further includes a third switch K3, which is connected to both the DC bus and the power interface in the first charging interface 210. The second energy storage and charging device 300 further includes a fourth switch K4, which is connected to both the DC bus and the power interface in the second charging interface 310. Specifically, when the first energy storage and charging device 200 is in charging mode and the second energy storage and charging device 300 is in V2G mode, the fourth switch K4 is on and the second power conversion unit 330 is not working, or the fourth switch K4 is off and the second power conversion unit 330 is working; or, when the second energy storage and charging device 300 is in charging mode and the first energy storage and charging device 200 is in V2G mode, the third switch K3 is on and the first power conversion unit 230 is not working, or the third switch K3 is off and the first power conversion unit 230 is working.

[0083] In other words, when the test control unit 120 controls the second energy storage device 300 to be in V2G mode, it can control the fourth switch K4 to be open and control the second power conversion unit 330 and the fourth power conversion unit 340 to operate, so as to feed the second electrical energy to the AC grid through the second power conversion unit 330 and the fourth power conversion unit 340; or, it can control the fourth switch K4 to be open and control the fourth power conversion unit 340 to operate, so as to feed the second electrical energy to the AC grid through the fourth power conversion unit 340. In this way, V2G testing of the second energy storage device 300 can be performed for different paths.

[0084] Similarly, when the test control unit 120 controls the first energy storage device 200 to be in V2G mode, it can control the third switch K3 to be open and control the first power conversion unit 230 and the third power conversion unit 240 to operate, so as to feed the second electrical energy to the AC grid through the first power conversion unit 230 and the third power conversion unit 240; or, it can control the third switch K3 to be open and control the third power conversion unit 240 to operate, so as to feed the second electrical energy to the AC grid through the third power conversion unit 240. In this way, V2G testing can be performed on the first energy storage device 200 for different paths.

[0085] In this embodiment, when performing V2G testing on the energy storage and charging device, testing can be conducted through different pathways. This allows for further testing of the two power conversion units in the energy storage and charging device. For example, the second and fourth power conversion units can be operated first. If a problem is found during testing, the fourth power conversion unit can be operated to further determine the source of the problem.

[0086] In some embodiments, referring to FIG6, the DC bus is also adapted to connect to the energy storage supplementation device 400. When the first energy storage device 200 is in charging mode and the second energy storage device 300 is in V2L mode, the first switch K1 is turned on, and the electrical energy of the first energy storage unit 220 is transmitted to the energy storage supplementation device 400 in sequence through the DC bus, the first power conversion unit 230, the first charging interface 210, the connection unit 110, the second charging interface 310, the second power conversion unit 330 and the DC bus. When the second energy storage device 300 is in charging mode and the first energy storage device 200 is in V2L mode, the second switch K2 is turned on, and the electrical energy of the second energy storage unit 320 is transmitted to the energy storage supplementation device 400 in sequence through the DC bus, the second power conversion unit 330, the second charging interface 310, the connection unit 110, the first charging interface 210, the first power conversion unit 230 and the DC bus.

[0087] It should be noted that the energy storage supplementation device 400 may include n (n is a positive integer) energy storage modules. Each energy storage module includes a fifth power conversion unit and a battery cascade utilization battery pack. The fifth power conversion unit is electrically connected to both the DC bus and the battery cascade utilization battery pack. The fifth power conversion unit may include a bidirectional DC-DC conversion circuit, such as a BUCK-BOOST circuit with power factor correction. In some embodiments, the energy storage supplementation device 400 may also include a fifth switch K5, through which the fifth power conversion unit in each energy storage module is electrically connected to the DC bus.

[0088] During testing, the test control unit 120 can control the first switch K1 to close and control the first power conversion unit 230 to operate, converting the first electrical energy from the first energy storage unit 220 into second electrical energy, which is then transmitted to the second power conversion unit 330 through the first charging interface 210, the connection unit 110, and the second charging interface 310. Simultaneously, the test control unit 120 controls the second switch K2 to open and controls the second power conversion unit 330 to operate, or controls the fourth switch K4 to close, and controls the energy storage supplementation device 400 to operate, so that the energy storage supplementation device 400 acts as a load consuming the second electrical energy. At this time, relative to the first energy storage and charging device 200, the second energy storage and charging device 300 is equivalent to a vehicle, thus enabling testing of the charging function of the first energy storage and charging device 200, such as charging a vehicle; simultaneously, relative to the second energy storage and charging device 300, the first energy storage and charging device 200 is equivalent to a vehicle, allowing the second energy storage and charging device 300 to perform V2L (vehicle-to-everything) function testing.

[0089] It should be noted that in this example, the test control unit 120 can also control the second switch K2 to close and control the second power conversion unit 330 to operate, so as to test the V2V function of the second energy storage device 300; it can also control the second switch K2 to open and control the second power conversion unit 330 and the fourth power conversion unit 340 to operate, or control the fourth switch K4 to close and control the fourth power conversion unit 340 to operate, so as to test the V2G function of the second energy storage device 300. That is to say, in this example, the second energy storage device 300 can be tested for V2V function, V2G function, and V2L function.

[0090] Similarly, the test control unit 120 can control the second switch K2 to close and control the second power conversion unit 330 to operate, so as to convert the first electrical energy of the second energy storage unit 320 into second electrical energy, which is then transmitted to the first power conversion unit 230 through the second charging interface 310, the connection unit 110, and the first charging interface 210. Simultaneously, the test control unit 120 can control the first switch K1 to open and control the first power conversion unit 230 to operate, or control the third switch K3 to close, and control the energy storage supplementation device 400 to operate, so that the energy storage supplementation device 400 acts as a load consuming the second electrical energy. At this time, relative to the second energy storage and charging device 300, the first energy storage and charging device 200 is equivalent to a vehicle, thus enabling the testing of the charging function of the second energy storage and charging device 300, such as charging a vehicle; simultaneously, relative to the first energy storage and charging device 200, the second energy storage and charging device 300 is equivalent to a vehicle, allowing the first energy storage and charging device 200 to perform V2L (vehicle-to-everything) function testing.

[0091] It should be noted that in this example, the test control unit 120 can also control the first switch K1 to close and control the first power conversion unit 230 to operate, so as to test the V2V function of the first energy storage device 200; it can also control the first switch K1 to open and control the first power conversion unit 230 and the third power conversion unit 240 to operate, or control the third switch K3 to close and control the third power conversion unit 240 to operate, so as to test the V2G function of the first energy storage device 200. That is to say, in this example, the first energy storage device 200 can be tested for V2V function, V2G function, and V2L function.

[0092] In this embodiment, the charging function, V2V, V2G and V2L functions of the energy storage and charging device can be tested.

[0093] In some embodiments, referring to FIG6, the first charging device 200 includes a first control unit 250, and the second charging device 300 includes a second control unit 350. The test control unit 120 communicates with the first control unit 250 and the second control unit 350 respectively to control the first charging device 200 and the second charging device 300 to perform charge and discharge tests. That is, the test control unit 120 can communicate with the control units in each charging device through the signal interface in the charging interface, and the control units in each charging device can control the power conversion units, switches, etc. in each charging device.

[0094] It should be noted that when the test control unit 120 controls the energy storage supplementation device 400, it can communicate and control it via wired or wireless communication, or it can be controlled by the first control unit 250 and the second control unit 350, as shown in Figure 6. The first control unit 250 and the second control unit 350 are respectively connected to the energy storage supplementation control unit in the energy storage supplementation device 400. The test control unit 120 can send the corresponding test commands to the energy storage supplementation control unit through the first control unit 250 or the second control unit 350 to control the energy storage supplementation device 400.

[0095] In some embodiments, continuing to refer to FIG6, the first charging device 200 may further include a CCU1 (Combined Charging Unit), which is located between the signal interface of the first control unit 250 and the first charging interface 210. The second charging device 300 may further include a CCU2, which is located between the signal interface of the second control unit 350 and the second charging interface 310. The test control unit 120 can communicate with the control unit in each charging device through the signal interface in the charging interface and the CCU in each charging device. It is understood that the CCU1 may also be integrated into the first control unit 250 and the CCU2 may be integrated into the second control unit 350; this is not a limitation.

[0096] In some embodiments, the first control unit 250 and the second control unit 350 may employ an EMS (Energy Management System) as shown in FIG7. Referring to FIG7, the EMS communicates with a bidirectional DC-DC converter and a bidirectional AC-DC converter via CAN1 to control the bidirectional DC-DC converter and the bidirectional AC-DC converter. For example, in the first energy storage and charging device 200, the bidirectional DC-DC converter is a first power conversion unit 230, and the bidirectional AC-DC converter is a third power conversion unit 240. The EMS communicates with a battery management unit via CAN2. The battery management unit also communicates with a battery monitoring unit via C-CAN and with a current sensor via S-CAN to monitor the battery status. For example, in the first energy storage and charging device 200, the battery is a first energy storage unit 220. The EMS also communicates with the charging interface via CAN4 and CCU, and then with the test control unit 120. The EMS also communicates with a thermal management module and a fire protection module via CAN3 to realize thermal management control and fire protection control. For example, a thermal management module and a fire protection module are provided in the first energy storage and charging device 200 to protect the device. The EMS also communicates with the storage module via RS485 for data storage. The CAN5 interface of the EMS is a reserved external energy storage interface, which can communicate with the energy storage supplementation device 400. The EMS can also communicate with a 4G module via RS485 or CAN for wireless communication, or with a human-machine interface for displaying relevant information. It should be noted that Figure 7 is only an illustrative example, and other interfaces or functions may also be included; this is not a limitation.

[0097] In summary, the technical solution of this disclosure involves connecting the power interfaces of the charging ports of two energy storage devices via a connection unit, thereby electrically connecting the two devices. A test control unit is then connected to the signal interfaces of the charging ports of each of the two devices to communicate with them and control their charge-discharge testing. Thus, by electrically connecting the two devices through a testing device and controlling their charge-discharge through communication, bidirectional charge-discharge testing of the two devices can be achieved. This method is convenient, and the testing device is small and low-cost, which is beneficial for on-site maintenance and debugging.

[0098] The charging system of this disclosure will now be described in conjunction with specific embodiments.

[0099] Referring to Figure 1, the charging system includes a first charging device 200 and a second charging device 300. The first charging device 200 has a first charging interface 210; the second charging device 300 has a second charging interface 310. When performing charge and discharge tests on the first charging device 200 and the second charging device 300, the aforementioned test device 100 is used to connect the first charging interface 210 and the second charging interface 310 to perform charge and discharge tests on the first charging device 200 and the second charging device 300.

[0100] It should be noted that the specific structures of the first storage and charging device 200 and the second storage and charging device 300 can be referred to the foregoing, as can the testing process of the testing device 100 on the first storage and charging device 200 and the second storage and charging device 300, etc., and will not be repeated here.

[0101] Furthermore, the charging system may also include more charging devices with the same structure as the first charging device 200 and the second charging device 300, all of which can be charged and discharged using the testing device 100. In other words, the charging system may include at least two charging devices, each with a charging interface. When conducting charge and discharge tests on at least two charging devices, the aforementioned testing device can be used to connect the charging interfaces of any two charging devices to perform charge and discharge tests on any two devices. The structure of each charging device is the same as the circuit structure of the first charging device 200 and the second charging device 300.

[0102] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this disclosure, and not to limit them. Although this disclosure has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this disclosure, and they should all be covered within the scope of the claims and specification of this disclosure. 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. This disclosure is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A testing device, characterized in that, For performing charge-discharge tests on a first and a second energy storage device, the first energy storage device having a first charging interface and the second energy storage device having a second charging interface, the device includes: A connection unit, the connection unit being adapted to connect the power interface in the first charging interface and the power interface in the second charging interface, so as to electrically connect the first energy storage device and the second energy storage device; A test control unit is adapted to connect to the signal interface in the first charging interface and the signal interface in the second charging interface to communicate with the first and second energy storage devices respectively, so as to control the first and second energy storage devices to perform charge and discharge tests.

2. The testing apparatus according to claim 1, characterized in that, During the charge and discharge test, the first charging device is in charging mode and the second charging device is in Vehicle to X mode to perform charging function testing on the first charging device and V2X function testing on the second charging device; or, the second charging device is in charging mode and the first charging device is in V2X mode to perform charging function testing on the second charging device and V2X function testing on the first charging device.

3. The testing apparatus according to claim 2, characterized in that, The first energy storage and charging device includes a first energy storage unit and a first power conversion unit. The first energy storage unit is electrically connected to a DC bus, and the first power conversion unit is electrically connected to both the DC bus and the power interface of the first charging interface. The second energy storage and charging device includes a second energy storage unit and a second power conversion unit. The second energy storage unit is electrically connected to the DC bus, and the second power conversion unit is electrically connected to both the DC bus and the power interface of the second charging interface. When the first energy storage device is in charging mode and the second energy storage device is in vehicle to vehicle mode, the electrical energy of the first energy storage unit is transmitted to the second energy storage unit in sequence through the DC bus, the first power conversion unit, the first charging interface, the connection unit, the second charging interface, the second power conversion unit, and the DC bus. When the second energy storage device is in charging mode and the first energy storage device is in V2V mode, the electrical energy of the second energy storage unit is transmitted to the first energy storage unit in sequence through the DC bus, the second power conversion unit, the second charging interface, the connection unit, the first charging interface, the first power conversion unit, and the DC bus.

4. The testing apparatus according to claim 3, characterized in that, The first energy storage unit is electrically connected to the DC bus via a first switch, and the second energy storage unit is electrically connected to the DC bus via a second switch. The first energy storage and charging device further includes a third power conversion unit, which is electrically connected to both the DC bus and the AC power grid. The second energy storage and charging device further includes a fourth power conversion unit, which is electrically connected to both the DC bus and the AC power grid. When the first energy storage device is in charging mode and the second energy storage device is in Vehicle to Grid mode, the first switch is turned on, and the electrical energy of the first energy storage unit is transmitted to the AC power grid in sequence through the DC bus, the first power conversion unit, the first charging interface, the connection unit, the second charging interface, the second power conversion unit, the DC bus and the fourth power conversion unit. When the second energy storage device is in charging mode and the first energy storage device is in V2G mode, the second switch is turned on, and the electrical energy of the second energy storage unit is transmitted to the AC power grid in sequence through the DC bus, the second power conversion unit, the second charging interface, the connection unit, the first charging interface, the first power conversion unit, the DC bus, and the third power conversion unit.

5. The testing apparatus according to claim 4, characterized in that, The first energy storage device further includes a third switch, which is connected to both the DC bus and the power interface in the first charging interface. The second energy storage device further includes a fourth switch, which is connected to both the DC bus and the power interface in the second charging interface. When the first energy storage device is in charging mode and the second energy storage device is in V2G mode, the fourth switch is turned on and the second power conversion unit is not working, or the fourth switch is turned off and the second power conversion unit is working; When the second energy storage device is in charging mode and the first energy storage device is in V2G mode, the third switch is turned on and the first power conversion unit is not working; or, the third switch is turned off and the first power conversion unit is working.

6. The testing apparatus according to claim 4, characterized in that, The DC bus is also suitable for connecting energy storage supplementation equipment, wherein... When the first energy storage device is in charging mode and the second energy storage device is in Vehicle to Load mode, the first switch is turned on, and the electrical energy of the first energy storage unit is transmitted to the energy storage supplement device in sequence through the DC bus, the first power conversion unit, the first charging interface, the connection unit, the second charging interface, the second power conversion unit and the DC bus; When the second energy storage device is in charging mode and the first energy storage device is in V2L mode, the second switch is turned on, and the electrical energy of the second energy storage unit passes sequentially through the DC bus, the second power conversion unit, the second charging interface, the connection unit, the first charging interface, and the first power conversion unit. The DC bus transmits the energy to the energy storage supplementation device.

7. The testing apparatus according to any one of claims 1-6, characterized in that, The connection unit includes a positive power line and a negative power line. The two ends of the positive power line are adapted to connect to the positive power interface in the first charging interface and the positive power interface in the second charging interface. The two ends of the negative power line are adapted to connect to the negative power interface in the first charging interface and the negative power interface in the second charging interface.

8. The testing apparatus according to any one of claims 1-6, characterized in that, The test control unit includes a communication component that supports multiple communication protocols to enable the test control unit to communicate with different first and second storage and charging devices.

9. The testing apparatus according to claim 1, characterized in that, The first energy storage device includes a first control unit, and the second energy storage device includes a second control unit. The test control unit communicates with the first control unit and the second control unit respectively to control the first energy storage device and the second energy storage device to perform charge and discharge tests.

10. A charging system, characterized in that, include: A first energy storage and charging device, the first energy storage and charging device having a first charging interface; A second energy storage and charging device, the second energy storage and charging device having a second charging interface; When performing charge and discharge tests on the first and second charging devices, the test device according to any one of claims 1-9 is used to connect the first charging interface and the second charging interface to perform charge and discharge tests on the first and second charging devices.

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