Test method, device, controller and pcs test platform for battery equipment

Abstract

The application provides a battery device test method, device, controller and PCS test platform. The battery device comprises a first energy storage battery and a second energy storage battery. The first energy storage battery is connected with a direct current side of a first PCS module, the second energy storage battery is connected with a direct current side of a second PCS module, and an alternating current side of the first PCS module is connected with an alternating current side of the second PCS module. The test method comprises the following steps: when a test instruction is received, the first PCS module and the second PCS module are controlled to work in different constant power charging and discharging modes, so that the first energy storage battery and the second energy storage battery can be tested by mutual constant power charging and discharging. The application can improve the test efficiency of the energy storage battery.

Description

Technical Field

[0001] This application relates to the field of battery testing technology, and in particular to a testing method, apparatus, controller and PCS testing platform for battery devices. Background Technology

[0002] With the continuous development of new energy sources, battery equipment is being used more and more widely. As the demand for battery equipment increases, the reliability of battery equipment during factory testing becomes particularly important.

[0003] Power conversion systems (PCS) provide bidirectional AC / DC conversion; therefore, most manufacturers conduct charge / discharge tests on battery devices in the laboratory using PCS testing equipment. One end of the PCS testing equipment is connected to the battery device, and the other end is connected to the power grid. The battery device discharges to the grid through the PCS testing equipment, and the grid charges the battery device through the PCS testing equipment.

[0004] However, existing testing methods consume a lot of electrical energy during each test, increasing testing costs. Summary of the Invention

[0005] This application provides a testing method, apparatus, controller, and PCS testing platform for battery devices to solve the problem that existing testing methods require a large amount of electrical energy to be consumed during each test, increasing testing costs.

[0006] In a first aspect, embodiments of this application provide a testing method for a battery device. The battery device includes a first energy storage battery and a second energy storage battery. The first energy storage battery is connected to the DC side of a first PCS module, and the second energy storage battery is connected to the DC side of a second PCS module. The AC side of the first PCS module and the AC side of the second PCS module are connected.

[0007] The testing method may include: upon receiving a test command, controlling the first PCS module and the second PCS module to operate in different working modes to allow the electrical energy to flow back and forth between the first energy storage battery and the second energy storage battery. The working modes include a constant power discharge mode and a constant power charging mode. Specifically, when a first preset switching condition or a second preset switching condition is met, the first PCS module and the second PCS module are controlled to switch working modes. The first preset switching condition includes the first energy storage battery being fully charged and the second energy storage battery being discharged, or the first energy storage battery being discharged and the second energy storage battery being fully charged. The second preset switching condition includes the change in the electrical charge of the first energy storage battery and the second energy storage battery being greater than or equal to a preset change.

[0008] When the first PCS module and the second PCS module switch operating modes at least once, the first PCS module and the second PCS module are controlled to operate in different operating modes so that the power of the first energy storage battery reaches the first preset factory power and the power of the second energy storage battery reaches the second preset factory power.

[0009] Secondly, embodiments of this application provide a testing apparatus for a battery device. The battery device includes a first energy storage battery and a second energy storage battery. The first energy storage battery is connected to the DC side of a first PCS module, and the second energy storage battery is connected to the DC side of a second PCS module. The AC side of the first PCS module and the AC side of the second PCS module are connected.

[0010] The testing device may include: a first control module, used to control the first PCS module and the second PCS module to operate in different working modes when a test command is received, so that the power flows back and forth between the first energy storage battery and the second energy storage battery. The working modes include a constant power discharge mode and a constant power charging mode. The first preset switching condition is that the first PCS module and the second PCS module switch working modes when a first preset switching condition or a second preset switching condition is met. The first preset switching condition includes the first energy storage battery being fully charged and the second energy storage battery being discharged, or the first energy storage battery being discharged and the second energy storage battery being fully charged. The second preset switching condition includes the change in the power of the first energy storage battery and the second energy storage battery being greater than or equal to a preset change.

[0011] The second control module is used to control the first PCS module and the second PCS module to work in different working modes when the first PCS module and the second PCS module switch working modes at least once, so that the power of the first energy storage battery reaches the first preset factory power and the power of the second energy storage battery reaches the second preset factory power.

[0012] Thirdly, embodiments of this application provide a controller, including a memory and a processor. The memory stores a computer program that can run on the processor. When the processor executes the computer program, it implements the steps of the battery device testing method as described in the first aspect or any possible implementation of the first aspect.

[0013] Fourthly, embodiments of this application provide a PCS testing platform, including a controller as described in the third aspect above, a first PCS module, and a second PCS module, both of which are controlled by the controller;

[0014] The first PCS module and the second PCS module are connected on their AC sides, and the AC side is also used to connect to the power grid; the DC side of the first PCS module is used to connect to the first energy storage battery, and the DC side of the second PCS module is used to connect to the second energy storage battery.

[0015] Fifthly, embodiments of this application provide a computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps of the battery device testing method as described in the first aspect or any possible implementation of the first aspect.

[0016] This application provides a testing method, apparatus, controller, and PCS testing platform for battery devices. By controlling the first and second PCS modules to operate in different constant power charge / discharge modes upon receiving a test command, the first and second energy storage batteries can perform constant power charge / discharge tests on each other. This eliminates the need for the power grid to charge each battery individually each time, reducing test energy consumption and lowering testing costs. Furthermore, embodiments of this application can simultaneously perform charge / discharge tests on two energy storage batteries, improving overall testing efficiency. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is an existing PCS testing platform provided in the embodiments of this application;

[0019] Figure 2 This application provides a PCS testing platform.

[0020] Figure 3 This is a flowchart illustrating the implementation of the battery device testing method provided in the embodiments of this application;

[0021] Figure 4 This is a schematic diagram of the primary circuit connection of the PCS test platform provided in the embodiments of this application;

[0022] Figure 5 This is a schematic diagram of the transformer soft-start control circuit of the PCS test platform provided in the embodiments of this application;

[0023] Figure 6 This is a communication topology diagram of the PCS test platform provided in the embodiments of this application;

[0024] Figure 7 This is a schematic diagram of PCS startup and shutdown provided in an embodiment of this application;

[0025] Figure 8 This is a diagram showing the power flow of the PCS test platform provided in this application embodiment under drag mode;

[0026] Figure 9 This is a diagram showing the power flow of the PCS test platform provided in this application under single-unit charge / discharge mode;

[0027] Figure 10 This is a structural layout diagram of the test platform provided in the embodiments of this application;

[0028] Figure 11 This is a schematic diagram of the structure of the battery device testing apparatus provided in the embodiments of this application;

[0029] Figure 12 This is a schematic diagram of the controller provided in an embodiment of this application. Detailed Implementation

[0030] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of this application. However, those skilled in the art will understand that this application may also be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods have been omitted so as not to obscure the description of this application with unnecessary detail.

[0031] To make the objectives, technical solutions, and advantages of this application clearer, the following description will be provided in conjunction with the accompanying drawings and specific embodiments.

[0032] Figure 1 This is an existing PCS testing platform provided in the embodiments of this application, such as... Figure 1 As shown, existing PCS test platforms typically include a PCS module, which is connected to the power grid and the energy storage battery respectively.

[0033] During charging tests, the PCS module operates in charging mode, and the grid charges the energy storage battery through the PCS module. During discharging tests, the PCS module operates in discharging mode, and the energy storage battery discharges to the grid through the PCS module. The energy storage battery is tested through charging and discharging.

[0034] Existing PCS testing platforms can only test a single energy storage battery at a time. Even when testing multiple energy storage batteries, parallel testing is achieved by increasing the number of PCS modules, with no interaction between the modules. During testing, the power grid needs to frequently charge and discharge, significantly increasing energy consumption and resulting in high testing costs.

[0035] To address the aforementioned issues, this application provides a battery device testing method that utilizes a new PCS testing platform and corresponding testing methods to complete charge-discharge tests on two energy storage batteries with lower power consumption.

[0036] Figure 2 This application provides a PCS testing platform, such as... Figure 2 As shown, in some embodiments of this application, the PCS test platform may include a first PCS module and a second PCS module. This PCS test platform can test battery devices.

[0037] In embodiments of this application, the battery device includes a first energy storage battery and a second energy storage battery. The first energy storage battery is connected to the DC side of a first PCS module, and the second energy storage battery is connected to the DC side of a second PCS module. The AC side of the first PCS module and the AC side of the second PCS module are also connected. The AC sides of the first PCS module and the second PCS module can be connected via a three-winding transformer to enable energy exchange between them.

[0038] In addition, the AC side of the first PCS module and the AC side of the second PCS module can be connected to the power grid to enable energy interaction between the first energy storage battery, the second energy storage battery and the power grid.

[0039] In the embodiments of this application, both the first PCS module and the second PCS module can realize the conversion between AC and DC, thereby achieving bidirectional energy flow.

[0040] This application embodiment is passed through Figure 2 The PCS test platform shown can realize the following energy interaction circuit:

[0041] Line 1: First energy storage battery → First PCS module → Second energy storage PCS module → Second energy storage battery. At this time, the first energy storage battery discharges to the second energy storage battery, while the second energy storage battery is charging.

[0042] Line 2: First energy storage battery → First PCS module → Power grid. At this time, the first energy storage battery discharges to the power grid.

[0043] Line 3: Power grid → First PCS module → First energy storage battery. At this time, the power grid charges the first energy storage battery.

[0044] Line 4: Second energy storage battery → Second PCS module → First energy storage PCS module → First energy storage battery. At this time, the second energy storage battery discharges to the first energy storage battery, while the first energy storage battery is charging.

[0045] Line 5: Second energy storage battery → Second PCS module → Power grid. At this time, the second energy storage battery discharges to the power grid.

[0046] Line 6: Power grid → Second PCS module → Second energy storage battery. At this time, the power grid charges the second energy storage battery.

[0047] As can be seen from the above circuit, the first PCS module and the second energy storage PCS module can include battery charging mode, battery discharging mode, grid charging mode and grid discharging mode.

[0048] The operating modes include: battery charging mode (where one energy storage battery charges another), battery discharging mode (where one energy storage battery discharges into another), grid charging mode (where the grid charges the energy storage battery), and grid discharging mode (where the energy storage battery discharges into the grid).

[0049] See Figure 3 This illustrates a flowchart of the implementation of the testing method for the battery device provided in an embodiment of this application. Figure 3 As shown, a test method for battery devices is applied to, for example... Figure 2 The PCS test platform shown may include test methods S101 to S102.

[0050] S101, upon receiving a test command, controls the first PCS module and the second PCS module to operate in different working modes to allow the power to flow back and forth between the first energy storage battery and the second energy storage battery. The working modes include constant power discharge mode and constant power charging mode.

[0051] Specifically, when the first preset switching condition or the second preset switching condition is met, the first PCS module and the second PCS module are controlled to switch their working modes. The first preset switching condition includes the first energy storage battery being fully charged and the second energy storage battery being discharged, or the first energy storage battery being discharged and the second energy storage battery being fully charged. The second preset switching condition includes the change in the amount of charge of the first energy storage battery and the second energy storage battery being greater than or equal to a preset change.

[0052] S102, when the first PCS module and the second PCS module switch working modes at least once, control the first PCS module and the second PCS module to work in different working modes so that the power of the first energy storage battery reaches the first preset factory power and the power of the second energy storage battery reaches the second preset factory power.

[0053] In the embodiments of this application, the test instruction is used to indicate that a factory charge-discharge test is performed on the first energy storage battery and the second energy storage battery. A full discharge test may include a full charge-discharge test and a shallow charge-discharge test. The battery device test method provided in the embodiments of this application is applicable to both full charge-discharge tests and shallow charge-discharge tests.

[0054] Generally, before testing, the first PCS module can be controlled to charge the first energy storage battery, and the second PCS module can be controlled to discharge the second energy storage battery, so as to ensure that the first energy storage battery is fully charged and the second energy storage battery is discharged.

[0055] When both the first and second energy storage batteries are charged, priority is given to discharging the first energy storage battery from the second battery. If the charge is insufficient, the first battery is then recharged through the power grid. If the second battery still has remaining charge after discharging, it can be discharged through the power grid.

[0056] Alternatively, the first PCS module can be controlled to discharge the first energy storage battery, and the second PCS module can be controlled to charge the second energy storage battery, so as to ensure that the first energy storage battery is discharged and the second energy storage battery is fully charged.

[0057] When both the first and second energy storage batteries are charged, priority is given to ensuring that the first energy storage battery discharges to the second energy storage battery. If the charge is insufficient, the second energy storage battery is then charged through the power grid. If the first energy storage battery still has remaining charge after discharging, it can be discharged through the power grid.

[0058] In the embodiments of this application, the first energy storage battery and the second energy storage battery may have the same capacity.

[0059] In this embodiment, upon receiving a test command, the first PCS module and the second PCS module can be controlled to operate in different working modes to achieve constant power charging and discharging, so that the electrical energy flows back and forth between the first energy storage battery and the second energy storage battery to achieve charging and discharging testing.

[0060] Specifically, when either the first or second preset switching condition is met, the first or second PCS module can be controlled to switch its operating mode to change the direction of energy flow. The first preset switching condition is the switching condition for full charge / discharge, and the second preset switching condition is the switching condition for shallow charge / discharge.

[0061] The test command may include a first test command and a second test command. The first test command indicates a full charge-discharge test, and the second test command indicates a shallow charge-discharge test.

[0062] This application embodiment performs only one type of charge-discharge test simultaneously. Upon receiving a first test instruction, a first preset switching condition can be used as the switching condition. Upon receiving a second test instruction, a second preset switching condition can be used as the switching condition.

[0063] In the embodiments of this application, the constant power charging mode is a working mode of charging the battery at a preset battery charging power, and the constant power discharging mode is a working mode of discharging the battery at a preset battery discharging power.

[0064] The preset battery charging power and preset battery discharging power can be the same or different, depending on the actual situation. For example, both the preset battery charging power and preset discharging power can be 40% of the PCS module's rated operating power.

[0065] Compared to constant current or constant voltage discharge, this embodiment uses constant power charging and discharging, which ensures the consistency of the energy storage battery's charging and discharging, and guarantees a consistent charging and discharging rate. The following provides a detailed description of full charge / discharge tests and shallow charge / discharge tests.

[0066] (1) Full charge and discharge test, which is divided into the following two cases:

[0067] 1. The initial state is: the first energy storage battery is fully charged and the second energy storage battery is discharged, and the first preset switching condition is executed.

[0068] Upon receiving the first test command, the first PCS module is controlled to be in constant power discharge mode, and the second PCS module is controlled to be in constant power charging mode, so that the power of the first energy storage battery flows to the second energy storage battery, so as to perform a discharge test on the first energy storage battery and a charging test on the second energy storage battery.

[0069] When the first energy storage battery is detected to be discharged and the second energy storage battery is fully charged, the second PCS module can be controlled to be in constant power discharge mode and the first PCS module can be controlled to be in constant power charging mode, so that the power of the second energy storage battery flows to the first energy storage battery, so as to perform charging test on the first energy storage battery and discharging test on the second energy storage battery.

[0070] When it is detected that the first PCS module and the second PCS module have switched working modes once, the first PCS module can be controlled to be in constant power discharge mode so that the power of the first energy storage battery drops to the first preset factory power level, and the second PCS module can be controlled to be in constant power charging mode so that the power of the second energy storage battery rises to the second preset factory power level.

[0071] 2. The initial state is: the first energy storage battery is discharged and the second energy storage battery is fully charged, and the first preset condition is executed.

[0072] Upon receiving the first test command, the second PCS module is controlled to be in constant power discharge mode, and the first PCS module is controlled to be in constant power charging mode, so that the power of the second energy storage battery flows to the first energy storage battery, so as to perform a discharge test on the second energy storage battery and a charging test on the first energy storage battery.

[0073] When the second energy storage battery is detected to be discharged and the first energy storage battery is fully charged, the first PCS module can be controlled to be in constant power discharge mode and the second PCS module can be controlled to be in constant power charging mode, so that the power of the first energy storage battery flows to the second energy storage battery, so as to perform charging test on the second energy storage battery and discharging test on the first energy storage battery.

[0074] When it is detected that the first PCS module and the second PCS module have switched working modes once, the first PCS module can be controlled to be in constant power charging mode so that the charge of the first energy storage battery can be increased to the first preset factory charge. At the same time, the second PCS module can be controlled to be in constant power discharging mode so that the charge of the second energy storage battery can be reduced to the second preset factory charge.

[0075] (2) Shallow charge and discharge test, which is divided into the following two situations:

[0076] 1. The initial state is: the power of the first energy storage battery is higher than the power of the second energy storage battery, and the power of the first energy storage battery is greater than or equal to the first preset power, while the power of the second energy storage battery is less than or equal to the second preset power. The second preset condition is then executed.

[0077] Upon receiving the second test command, the first PCS module is controlled to be in constant power discharge mode, and the second PCS module is controlled to be in constant power charging mode, so that the power of the first energy storage battery flows to the second energy storage battery, so as to perform a shallow discharge test on the first energy storage battery and a shallow charge test on the second energy storage battery.

[0078] When the decrease in the charge of the first energy storage battery exceeds a preset change amount, and the increase in the charge of the second energy storage battery exceeds a preset change amount, the second PCS module can be controlled to be in constant power discharge mode, and the first PCS module can be controlled to be in constant power charging mode, so that the charge of the second energy storage battery flows to the first energy storage battery, so as to perform a shallow charge test on the first energy storage battery and a shallow discharge test on the second energy storage battery.

[0079] When it is detected that the first PCS module and the second PCS module have switched working modes once, the first PCS module can be controlled to be in constant power discharge mode so that the power of the first energy storage battery drops to the first preset factory power level, and the second PCS module can be controlled to be in constant power charging mode so that the power of the second energy storage battery rises to the second preset factory power level.

[0080] 2. The initial state is: the power of the first energy storage battery is lower than the power of the second energy storage battery, and the power of the first energy storage battery is less than or equal to the second preset power, while the power of the second energy storage battery is greater than or equal to the first preset power. The second preset condition is then executed.

[0081] Upon receiving the second test command, the first PCS module is controlled to be in constant power charging mode, and the second PCS module is controlled to be in constant power discharging mode, so that the power of the second energy storage battery flows to the first energy storage battery, so as to perform a shallow charging test on the first energy storage battery and a shallow discharging test on the second energy storage battery.

[0082] When the increase in the charge of the first energy storage battery exceeds a preset change amount, and the decrease in the charge of the second energy storage battery exceeds a preset change amount, the first PCS module can be controlled to be in constant power discharge mode, and the second PCS module can be controlled to be in constant power charging mode, so that the charge of the first energy storage battery flows to the second energy storage battery, so as to perform a shallow discharge test on the first energy storage battery and a shallow charge test on the second energy storage battery.

[0083] When it is detected that the first PCS module and the second PCS module have switched working modes once, the first PCS module can be controlled to be in constant power charging mode so that the charge of the first energy storage battery can be increased to the first preset factory charge. At the same time, the second PCS module can be controlled to be in constant power discharging mode so that the charge of the second energy storage battery can be reduced to the second preset factory charge.

[0084] In the embodiments of this application, the first preset factory charge and the second preset factory charge can be the same or different, and can be set according to actual conditions. For example, the first preset factory charge can be 40% of the rated capacity of the first energy storage battery, and the second preset factory charge can be 40% of the rated capacity of the second energy storage battery. Alternatively, the first preset factory charge can be 50% of the rated capacity of the first energy storage battery, and the second preset factory charge can be 40% of the rated capacity of the second energy storage battery. Excess power can be discharged through the power grid, and insufficient power can be replenished through the power grid.

[0085] This embodiment of the application, upon receiving a test command, controls the first PCS module and the second PCS module to operate in different constant power charge-discharge modes, enabling the first and second energy storage batteries to perform constant power charge-discharge tests on each other. This eliminates the need for the power grid to charge each energy storage battery individually each time, reducing test energy consumption and lowering test costs. Furthermore, this embodiment of the application can simultaneously perform charge-discharge tests on two energy storage batteries, improving overall test efficiency.

[0086] In some embodiments of this application, the aforementioned "when the first preset switching condition is met, controlling the first PCS module and the second PCS module to operate in different working modes, so that the power flows back and forth between the first energy storage battery and the second energy storage battery" may include:

[0087] The first PCS module is controlled to operate in a constant power discharge mode, and the second PCS module is controlled to operate in a constant power charging mode, so that the power in the first energy storage battery flows to the second energy storage battery.

[0088] When the first energy storage battery is discharged and the second energy storage battery is fully charged, the first PCS module is controlled to operate in a constant power charging mode, and the second PCS module is controlled to operate in a constant power discharging mode, so that the power in the second energy storage battery flows to the first energy storage battery.

[0089] When the first energy storage battery is fully charged and the second energy storage battery is discharged, the first PCS module is controlled to operate in a constant power discharge mode, and the second PCS module is controlled to operate in a constant power charging mode, so that the power in the first energy storage battery flows to the second energy storage battery.

[0090] In the embodiments of this application, the first energy storage battery is fully charged, and the second energy storage battery is discharged.

[0091] Before testing, the first energy storage battery can be charged with the power of the second energy storage battery, or the first energy storage battery can be charged by the grid to ensure it is fully charged. Conversely, the second energy storage battery can be discharged into the grid to ensure it is completely depleted.

[0092] The specific execution process is as follows: First, the first energy storage battery is discharged while the second energy storage battery is fully charged to complete the full-discharge test of the first energy storage battery and the full-charge test of the second energy storage battery. Second, the second energy storage battery is discharged while the first energy storage battery is fully charged to complete the full-charge test of the first energy storage battery and the full-discharge test of the second energy storage battery. Finally, after completing the full-charge-discharge tests of the first and second energy storage batteries, the first energy storage battery can continue to discharge while the second energy storage battery continues to charge, preparing for the subsequent setting of the factory default power.

[0093] This application embodiment is illustrated by taking the first energy storage battery being fully charged by default and the second energy storage battery being discharged by default as an example. The situation where the first energy storage battery is discharged by default and the second energy storage battery is fully charged by default can be obtained by referring to the above description, and will not be repeated here.

[0094] This application embodiment controls the first PCS module and the second PCS module to work in different working modes, which can complete the full charge and discharge test of the first energy storage battery and the second energy storage battery, thereby improving the overall test efficiency.

[0095] In actual testing, the following four situations may occur:

[0096] The first scenario is that the first energy storage battery is completely discharged, and the second energy storage battery is not fully charged, meaning that the discharge capacity of the first energy storage battery cannot meet the charging capacity of the second energy storage battery.

[0097] The second scenario is that the first energy storage battery is not fully charged, and the second energy storage battery is discharged, meaning that the discharge capacity of the second energy storage battery cannot meet the charging capacity of the first energy storage battery.

[0098] The third scenario: The first energy storage battery is not completely discharged, while the second energy storage battery is fully charged, meaning that the first energy storage battery has overflowed its capacity.

[0099] The fourth type: The first energy storage battery is fully charged, and the second energy storage battery is not discharged, that is, the second energy storage battery has overflowed.

[0100] The above four situations may cause the battery to fail the full charge and discharge test. This application provides corresponding solutions for the above four situations, which are described in detail below.

[0101] In some embodiments of this application, the AC sides of both the first PCS module and the second PCS module are connected to the power grid, and the operating modes include a grid charging mode and a grid discharging mode. Specifically, the grid charging mode involves the power grid charging the energy storage battery through the PCS module, and the grid discharging mode involves the energy storage battery discharging to the power grid through the PCS module.

[0102] Test methods may also include:

[0103] When the first energy storage battery is discharged and the second energy storage battery is not fully charged, the first PCS module is controlled to shut down, and the second PCS module is controlled to operate in grid charging mode so that the grid charges the second energy storage battery until the second energy storage battery is fully charged.

[0104] When the discharge capacity of the first energy storage battery cannot meet the charging capacity of the second energy storage battery, the first PCS module can be shut down and the second PCS module can be controlled to work in grid charging mode. The grid can charge the second energy storage battery until the second energy storage battery is fully charged, so that the first energy storage battery is discharged and the second energy storage battery is fully charged.

[0105] When the first energy storage battery is not fully charged and the second energy storage battery is discharged, the first PCS module is controlled to operate in grid charging mode, and the second PCS module is controlled to shut down, so that the grid charges the first energy storage battery until the first energy storage battery is fully charged.

[0106] When the discharge capacity of the second energy storage battery cannot meet the charging capacity of the first energy storage battery, the second PCS module can be shut down and the first PCS module can be controlled to work in grid charging mode. The grid can charge the first energy storage battery until the first energy storage battery is fully charged, so that the second energy storage battery is discharged and the first energy storage battery is fully charged.

[0107] When the first energy storage battery is not discharged and the second energy storage battery is fully charged, the first PCS module is controlled to operate in grid discharge mode, and the second PCS module is controlled to shut down, so that the first energy storage battery discharges to the grid until the first energy storage battery is discharged.

[0108] When the first energy storage battery overflows, the second PCS module can be shut down, and the first PCS module can be controlled to operate in grid discharge mode. The first energy storage battery can discharge to the grid until the first energy storage battery is completely discharged, so that the first energy storage battery is completely discharged and the second energy storage battery is fully charged.

[0109] When the first energy storage battery is fully charged and the second energy storage battery is not discharged, the first PCS module is controlled to shut down, and the second PCS module is controlled to operate in grid discharge mode so that the second energy storage battery discharges to the grid until the second energy storage battery is discharged.

[0110] When the second energy storage battery overflows, the first PCS module can be shut down and the second PCS module can be controlled to operate in grid discharge mode. The second energy storage battery can discharge to the grid until it is completely discharged, so that the second energy storage battery is completely discharged and the first energy storage battery is fully charged.

[0111] This application embodiment can control the PCS module to work in grid charging mode or grid discharging mode, enabling the energy storage battery to interact with the grid, avoiding the above four situations, and ensuring the reliability of energy storage battery testing.

[0112] In the embodiments of this application, the grid discharge mode is a constant power grid discharge mode with a preset grid discharge power, and the grid charging mode is a constant power grid charging mode with a preset grid charging power.

[0113] The preset grid discharge power and preset grid charging power can be the same or different. For example, both the preset grid discharge power and preset grid charging power can be 20% of the PCS module's rated power.

[0114] In addition, the preset grid discharge power is less than or equal to the maximum allowable grid discharge power, and the preset grid charging power is less than or equal to the maximum allowable grid charging power, in order to avoid impacting the grid and ensure grid stability.

[0115] based on Figure 2 The PCS test platform shown may also include a drag-and-drop interlock function for the first and second PCS modules. This will be described in detail below. In some embodiments of this application, the testing method for the energy storage battery may further include:

[0116] Upon receiving a first shutdown command, the system controls the first PCS module to shut down and, within a first preset time period, controls the second PCS module to shut down. The first shutdown command may include at least one of the following: a fault command for the first PCS module, a charge-free command for the first energy storage battery, and a discharge-free command for the first energy storage battery.

[0117] Upon receiving a second shutdown command, the system controls the second PCS module to shut down and, within a second preset time period, controls the first PCS module to shut down. The second shutdown command may include at least one of the following: a fault command for the second PCS module, a charge-free command for the second energy storage battery, and a discharge-free command for the second energy storage battery.

[0118] This application embodiment, by setting a drag interlock function, can control the other PCS module to stop when one PCS module stops, thus avoiding mutual power injection and damage to the energy storage battery, and ensuring the reliability of the test.

[0119] Figure 4 This is a schematic diagram of the primary circuit connection of the PCS test platform provided in the embodiments of this application, as shown below. Figure 4 As shown, the PCS test platform may include PCS1, PCS2, a three-winding transformer T1, and a low-voltage switchgear.

[0120] The DC side of PCS1 is connected to battery device 1, and the DC side of PCS2 is connected to battery device 2. The AC sides of both PCS1 and PCS2 are connected to one end of the three-winding transformer T1. The other end of the three-winding transformer T1 is connected to the 400V power grid through a low-voltage switchgear. The low-voltage switchgear includes a converter soft-start circuit and an AC surge circuit to avoid grid impact.

[0121] Figure 5 This is a schematic diagram of the transformer soft-start control circuit of the PCS test platform provided in this application embodiment, as shown below. Figure 5 As shown, KT1 is the start-delay relay, KK is the intermediate relay, KM is the soft-start circuit contactor, DL is the grid-side circuit breaker, and SS1 is the soft-start closing button.

[0122] The startup steps for the three-winding transformer T1 may include: setting the KT1 delay time to 5 seconds, ensuring the DL trip indicator light and the DL energy storage completion indicator light are on. 1. Press SS1. 2. T1 will be energized after 5 seconds.

[0123] Figure 6 This is a communication topology diagram of the PCS test platform provided in the embodiments of this application, such as... Figure 6As shown, the centralized control system mainly receives information uploaded by battery device A, battery device B, PCS-A and PCS-B, coordinates and controls PCS-A and PCS-B to start and stop charging and discharging simultaneously or charge and discharge individually, and sends system protection commands based on the uploaded information.

[0124] In a paired configuration, fiber optic communication is established between the two PCS units, primarily to achieve carrier synchronization, ensuring that the two PCS devices can achieve the same frequency and frequency for AC measurement. Carrier synchronization refers to generating a local oscillation in the receiving equipment that is in phase and at the same frequency as the received signal's carrier, which is then supplied to the demodulator for coherent demodulation.

[0125] The main interaction between the PCS and the battery device is alarm information exchange. The PCS processes the battery device alarm information, which can include the following three levels of processing: Level 1: The battery device sends restriction commands (no charging / no discharging) to the PCS to control the PCS's actions and protect the system. Level 2: The battery device instructs the PCS to perform protection actions through fault points or dry contacts: Under normal communication conditions, when a battery fault occurs, the fault point instructs the PCS to perform protection actions; when communication fails, the dry contact instructs the PCS to perform protection actions. When the fault disappears, the battery device should be able to restore the dry contact signal. Level 3: When the first two levels of protection fail, the battery device can control the shutdown of the battery device's main circuit through commands.

[0126] The main functions of the PCS testing platform provided in this application embodiment include:

[0127] (1) The PCS meets the constant power charging and discharging and constant current charging and discharging of the AC / DC side. The power and current can be set, and it has standby and emergency stop functions.

[0128] (2) For three-winding transformers, it is necessary to solve the problem of inrush current impact generated during transformer startup.

[0129] First, during the start-up and shutdown process of normal testing, the charging and discharging power of PCS-A and PCS-B is managed uniformly by the centralized control system. Figure 7 This is a schematic diagram of PCS startup and shutdown provided in an embodiment of this application, such as... Figure 7 As shown, during startup, a synchronous stepped loading method is used, synchronously loading to the battery device's 0.4P charge / discharge rate. During shutdown, the PCS output power is also reduced in a stepped manner.

[0130] Secondly, during the grid-side transformer startup process, the transformer is pre-charged via a soft-start circuit, which effectively reduces the impact of inrush current. The soft-start control circuit, for example... Figure 5 As shown.

[0131] (3) The centralized control system serves as the human-machine interface and control center for the entire platform, possessing intelligent testing functions, including charge / discharge linkage (i.e., platform-to-tow function), fault shutdown linkage, real-time data display and data storage functions (with an operating console to meet background monitoring functions), alarm information processing (by controlling a three-color light to remind test personnel), etc. The testing process is conducted by the test engineer according to regulations. A prompt box will pop up when the test is completed or when there is an abnormality during the test, and data can be saved at the same time.

[0132] Among them, PCS-A and PCS-B communicate in real time, PCS and battery equipment communicate in real time, and PCS and battery equipment communicate with the centralized control system. When one PCS receives a fault command, or a shutdown command issued by the centralized control system, or a command to stop charging and discharging issued by the battery equipment, it must shut down and meet the shutdown interlock requirements, and shut down the other PCS within 10ms.

[0133] For example, Figure 8 This is a diagram showing the power flow of the PCS test platform provided in this application embodiment under drag mode. Figure 9 This is a diagram showing the power flow of the PCS test platform provided in this application under single-unit charge / discharge mode. (See diagram for example.) Figure 8 and Figure 9 As shown, the testing process provided in this application embodiment is as follows:

[0134] Under normal circumstances, two sets of battery devices form a test unit. One set is charged while the other is discharged, in a charge-discharge manner. Figure 8 As shown. If additional charging or discharging of the battery equipment is required during the test, power will be drawn directly from the workshop's internal power grid or fed back to the workshop's internal power grid, such as... Figure 9 As shown.

[0135] The overall testing process is divided into full charge / full discharge and shallow charge / shallow discharge. The detailed testing process is as follows:

[0136] (I) Full-charge and discharge test procedure

[0137] (1) The high and low voltage harnesses and communication harnesses of the test system are connected.

[0138] (2) Communication between the battery equipment, PCS, and centralized control system is normal.

[0139] (3) Centralized control system issues instructions

[0140] Command 1-1: PCS-A ramp discharge starts, then enters constant power discharge mode, discharge power 0.4P;

[0141] Command 1-2: PCS-B ramp charging starts, then enters constant power charging mode with a charging power of 0.4P; Command 1-1 and Command 1-2 must be issued simultaneously.

[0142] (4) Whether the centralized control system receives a no-discharge or no-charge signal (battery device 1 is discharged or battery device 2 is fully charged, or both).

[0143] Upon receiving a signal prohibiting charging or discharging from the battery device, the controller terminates the PCS-A ramp discharge and subsequently shuts down; the PCS-B ramp charging terminates and subsequently shuts down. Simultaneously, the centralized control system issues corresponding commands based on the maximum permissible feeder power or the maximum permissible charging power of the grid.

[0144] Instructions 1-3: Let a group that is full or empty stand still. If one group is full and the other group is empty, then proceed to step (5).

[0145] Instructions 1-4: A group that is not fully charged or discharged will initiate ramp charging or discharging, with the charging or discharging power being 0.2P ≤ the maximum charging or discharging power allowed by the power grid, until a battery device signal prohibiting charging or discharging is received. At this point, the PCS will enter ramp discharging or charging and then stop.

[0146] (5) Centralized control system issues instructions

[0147] Instructions 1-5: PCS-A ramp charging starts, then enters constant power charging mode with a charging power of 0.4P;

[0148] Commands 1-6: PCS-B ramp discharge starts, then enters constant power discharge mode with a discharge power of 0.4P; Commands 1-5 and 1-6 must be issued synchronously.

[0149] (6) Whether the control system receives a no-discharge or no-charge signal (battery device 1 is fully charged or battery device 2 is discharged, or both).

[0150] Upon receiving a signal prohibiting charging or discharging from the battery device, the controller terminates ramp charging in PCS-A and subsequently shuts down; similarly, it terminates ramp discharging in PCS-B and subsequently shuts down. Simultaneously, the centralized control system issues corresponding commands based on the maximum permissible power supplied to the grid or the maximum permissible charging power from the grid.

[0151] Instructions 1-7: Let a group that is full or empty stand still. If one group is full and the other group is empty, then proceed to step (7).

[0152] Instructions 1-8: A group that is not fully charged or discharged will initiate ramp charging or discharging, with the charging or discharging power being 0.2P ≤ the maximum charging or discharging power allowed by the power grid, until a battery device signal prohibiting charging or discharging is received. At this point, the PCS enters ramp discharging or charging and then stops.

[0153] (7) The centralized control system issues instructions:

[0154] Commands 1-9: PCS-A ramp discharge starts, then enters constant power discharge mode, with a discharge power of 0.4P;

[0155] Commands 1-10: PCS-B ramp charging starts, then enters constant power charging mode with a charging power of 0.4P; Commands 1-9 and 1-10 must be issued simultaneously.

[0156] (8) Whether the centralized control system receives a no-discharge or no-charge signal (battery device 1 is discharged or battery device 2 is fully charged, or both).

[0157] Upon receiving a signal prohibiting charging or discharging from the battery device, the controller terminates the PCS-A ramp discharge and subsequently shuts down; the PCS-B ramp charging terminates and subsequently shuts down. Simultaneously, the centralized control system issues corresponding commands based on the maximum permissible feeder power or the maximum permissible charging power of the grid.

[0158] Instruction 1-11: Let a group that is full or empty stand still. If one group is full and the other group is empty, then proceed to step (9).

[0159] Instructions 1-12: A group that is not fully charged or discharged will initiate ramp charging or discharging, with the charging or discharging power being 0.2P ≤ the maximum charging or discharging power allowed by the power grid, until a battery device signal prohibiting charging or discharging is received. At this point, the PCS enters ramp discharging or charging and then stops.

[0160] (9) SOC adjustment to meet factory conditions (battery device 1 charged to 40% or 50%, battery device 2 discharged to 40% or 50%).

[0161] Instructions 1-13: PCS-A ramp charging starts, then enters constant power charging mode with a charging power of 0.4P;

[0162] Commands 1-14: PCS-B ramp discharge starts, then enters constant power discharge mode with a discharge power of 0.4P;

[0163] Instructions 1-13 and 1-14 must be issued simultaneously.

[0164] When the centralized control system receives a report from any battery device that the SOC has reached 40% or 50% (based on factory settings), the PCS-A ramp-up charging ends and the system shuts down; the PCS-B ramp-down discharging ends and the system shuts down. Simultaneously, the centralized control system issues corresponding instructions based on the maximum allowable grid power or the maximum allowable charging power of the grid.

[0165] Instructions 1-15: If a set of static points has reached the target SOC and the requirements are met, then execute step (10);

[0166] Instructions 1-16: A group that has not reached the target SOC shall initiate ramp charging or discharging, with the charging or discharging power being 0.2P ≤ the maximum charging or discharging power allowed by the grid, until the battery device reports that the SOC has reached the target value. The PCS then enters ramp discharging or charging and ends, and then stops.

[0167] (10) Complete the test: Save and analyze the test data of the battery device and output the test results.

[0168] (II) Shallow charge and discharge test procedure

[0169] (1) The high and low voltage harnesses and communication harnesses of the test system are connected.

[0170] (2) Communication between the battery equipment, PCS, and centralized control system is normal.

[0171] (3) The centralized control system calculates whether the charge capacity of battery device 1 is ≥20% SOC and whether the charge capacity of battery device 2 is ≤80% SOC; if the above conditions are met, then step (5) is executed; if the above conditions are not met, the centralized control system issues an instruction to execute step (4);

[0172] Command 2-1: PCS-A ramp charging starts, then enters constant power charging mode with a charging power of 0.4P;

[0173] Command 2-2: PCS-B ramp discharge starts, then enters constant power discharge mode with a discharge power of 0.4P; Commands 2-1 and 2-2 must be issued synchronously.

[0174] (4) Centralized control system collects SOC value of battery equipment

[0175] Determine if the SOC of battery device 1 is ≥20% or the SOC of battery device 2 is ≤80%. Once either condition is met, the PCS-A ramp discharge ends and the system shuts down; the PCS-B ramp charging ends and the system shuts down. The centralized control system issues corresponding instructions based on the maximum allowable grid power or the maximum allowable charging power of the grid.

[0176] Instructions 2-3: A set of cells that have reached the target SOC should be left to stand still;

[0177] Instructions 2-4: If the target SOC is not reached, the group will enter ramp charging or discharging start, and then enter constant power charging or discharging mode. The charging or discharging power is 0.2P ≤ the maximum charging or discharging power allowed by the grid, until the SOC reaches the target value. Then the PCS enters ramp discharging or charging end, and then stops.

[0178] (5) Centralized control system issues instructions

[0179] Command 2-5: PCS-A ramp discharge starts, then enters constant power discharge mode, discharge power 0.4P;

[0180] Command 2-6: PCS-B ramp charging starts, then enters constant power charging mode with a charging power of 0.4P; Command 2-5 and Command 2-6 must be issued simultaneously.

[0181] (6) Centralized control system calculates discharge or charge energy

[0182] When the charging or discharging energy reaches 20% SOC, the PCS-A ramp discharge ends and the machine shuts down; the PCS-B ramp charging ends and the machine shuts down.

[0183] (7) Centralized control system issues instructions

[0184] Command 2-7: PCS-A ramp charging starts, then enters constant power charging mode with a charging power of 0.4P;

[0185] Command 2-8: PCS-B ramp discharge starts, then enters constant power discharge mode, discharge power 0.4P;

[0186] Instructions 2-7 and 2-8 must be issued simultaneously.

[0187] (8) SOC adjustment to meet factory conditions (charge battery device 1 to 40% or 50%, discharge battery device 2 to 40% or 50%).

[0188] a. Upon receiving a 40% or 50% charge signal from battery device 1, PCS-A's ramp charging ends and it shuts down; PCS-B continues constant power discharge until it receives a 40% or 50% charge signal from battery device 2, at which point PCS-B's ramp discharge ends and it shuts down.

[0189] b. Upon receiving a 40% or 50% charge signal from battery device 2, PCS-B's ramp discharge ends and it shuts down; PCS-A continues constant power charging until it receives a 40% or 50% charge signal from battery device 1, at which point PCS-A's ramp charging ends and it shuts down.

[0190] Instruction a and instruction b are ORed, meaning only one of them will exist.

[0191] (9) Complete the test: Save and analyze the test data of the battery device and output the test results.

[0192] For example, Figure 10 This is a structural layout diagram of the test platform provided in the embodiments of this application. For example... Figure 10As shown, the main equipment inside the test platform provided in this application embodiment includes two PCS (converters), a three-winding transformer, a low-voltage switch cabinet, a communication power cabinet, a skid-mounted platform, and other auxiliary equipment.

[0193] The PCS (Power Control System) enables AC / DC conversion, facilitating bidirectional energy flow between the battery and the AC side. Through a hierarchical control strategy, it manages the charging and discharging of the battery equipment and controls charging and discharging power. One PCS connects to the battery equipment on its DC side and to one side of the transformer on its AC side. The voltage is converted to the required level for the AC side of another PCS via a three-winding transformer. This PCS then connects to the other battery equipment on its DC side, creating a charging and discharging link between the two battery systems. This process utilizes the battery equipment's own energy for charging and discharging testing, without consuming grid power, and simultaneously tests both battery systems.

[0194] At the same time, the voltage conversion function of the three-winding transformer is used to convert the voltage to the level required by the power grid, so as to realize the charging and discharging control of a single battery device.

[0195] The transformer is equipped with a dedicated temperature controller to detect and display the temperature rise of the transformer windings. It can automatically start and stop the cooling fan to force-cool the windings, preventing transformer failures caused by overheating and ensuring that the transformer operates in a safe condition.

[0196] On the other side of the transformer (grid side), a low-voltage switchgear is connected for real-time circuit control, protection, and monitoring. It also features a robust soft-start function to mitigate the impact of inrush current generated during transformer startup on the grid side. The communication and power cabinet houses the centralized control system, serving as the human-machine interface and control unit for the entire test platform, implementing charging and discharging verification strategies. All of these devices are mounted on a unified skid-mounted platform, integrating fire protection, UPS uninterruptible power supply, and three-color indicator lights, among other auxiliary functions.

[0197] The testing platform and corresponding testing methods provided in this application embodiment can realize charge-discharge parallel testing of two sets of battery equipment, and minimize the energy consumption on the grid side, saving testing costs; it can also realize charge-discharge control of a single set of battery equipment, and meet the SOC index requirement of about 50% before the battery leaves the factory. This application embodiment utilizes a testing platform composed of a PCS (converter), a three-winding transformer, and a centralized control system, and designs the logic and path for charge-discharge control. It can simulate the actual field commissioning environment, enabling in-factory testing of battery equipment, greatly ensuring the smooth progress of field commissioning and testing, reducing the occurrence of problems, and saving rework costs.

[0198] It should be understood that the sequence number of each step in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0199] The following are device embodiments of this application. For details not described in detail, please refer to the corresponding method embodiments described above.

[0200] Figure 11 A schematic diagram of the structure of a testing apparatus for a battery device provided in an embodiment of this application is shown. For ease of explanation, only the parts related to the embodiment of this application are shown, and are described in detail below:

[0201] like Figure 11 As shown, a battery device testing apparatus 20 is provided. The battery device includes a first energy storage battery and a second energy storage battery. The first energy storage battery is connected to the DC side of a first PCS module, and the second energy storage battery is connected to the DC side of a second PCS module. The AC side of the first PCS module and the AC side of the second PCS module are connected. The testing apparatus 20 may include:

[0202] The first control module 201 is used to control the first PCS module and the second PCS module to operate in different working modes when a test command is received, so that the power flows back and forth between the first energy storage battery and the second energy storage battery. The working modes include constant power discharge mode and constant power charging mode. Specifically, the first PCS module and the second PCS module switch working modes when a first preset switching condition or a second preset switching condition is met. The first preset switching condition includes the first energy storage battery being fully charged and the second energy storage battery being discharged, or the first energy storage battery being discharged and the second energy storage battery being fully charged. The second preset switching condition includes the change in the power of the first energy storage battery and the second energy storage battery being greater than or equal to a preset change.

[0203] The second control module 202 is used to control the first PCS module and the second PCS module to work in different working modes when the first PCS module and the second PCS module switch working modes at least once, so that the power of the first energy storage battery reaches the first preset factory power and the power of the second energy storage battery reaches the second preset factory power.

[0204] In some embodiments of this application, the first control module 202 is further configured to: control the first PCS module to operate in a constant power discharge mode and control the second PCS module to operate in a constant power charging mode, so that the charge in the first energy storage battery flows to the second energy storage battery; when the first energy storage battery is discharged and the second energy storage battery is fully charged, control the first PCS module to operate in a constant power charging mode and control the second PCS module to operate in a constant power discharge mode, so that the charge in the second energy storage battery flows to the first energy storage battery; when the first energy storage battery is fully charged and the second energy storage battery is discharged, control the first PCS module to operate in a constant power discharge mode and control the second PCS module to operate in a constant power charging mode, so that the charge in the first energy storage battery flows to the second energy storage battery.

[0205] In some embodiments of this application, the AC sides of both the first PCS module and the second PCS module are connected to the power grid, and the operating modes include a grid charging mode and a grid discharging mode. The testing device 20 may further include: a third control module, configured to, when the first energy storage battery is discharged and the second energy storage battery is not fully charged, control the first PCS module to shut down and control the second PCS module to operate in grid charging mode, so that the power grid charges the second energy storage battery until the second energy storage battery is fully charged; and to, when the first energy storage battery is not fully charged and the second energy storage battery is discharged, control the first PCS module to operate in grid charging mode. The system operates in grid discharge mode, and controls the second PCS module to shut down, so that the grid charges the first energy storage battery until it is fully charged. When the first energy storage battery is not discharged and the second energy storage battery is fully charged, the system controls the first PCS module to operate in grid discharge mode, and controls the second PCS module to shut down, so that the first energy storage battery discharges to the grid until it is fully discharged. When the first energy storage battery is fully charged and the second energy storage battery is not discharged, the system controls the first PCS module to shut down, and controls the second PCS module to operate in grid discharge mode, so that the second energy storage battery discharges to the grid until it is fully discharged.

[0206] In some embodiments of this application, the grid discharge mode is a constant power grid discharge mode with a preset grid discharge power, and the grid charging mode is a constant power grid charging mode with a preset grid charging power.

[0207] In some embodiments of this application, the constant power charging mode is a working mode that performs constant power charging with a preset battery charging power, and the constant power discharging mode is a working mode that performs constant power discharging with a preset battery discharging power.

[0208] In some embodiments of this application, the testing device 20 may further include: a fourth control module, configured to control the first PCS module to stop when a first stop command is received, and control the second PCS module to stop within a first preset time period; and to control the second PCS module to stop when a second stop command is received, and control the first PCS module to stop within a second preset time period.

[0209] Figure 12 This is a schematic diagram of the controller provided in an embodiment of this application. Figure 12 As shown, the controller 30 in this embodiment includes a processor 300 and a memory 301, wherein the memory 301 stores a computer program 302 that can run on the processor 300. When the processor 300 executes the computer program 302, it implements the steps in the test method embodiments of the various battery devices described above. Alternatively, when the processor 300 executes the computer program 302, it implements the functions of each module / unit in the various device embodiments described above.

[0210] The controller 30 may include, but is not limited to, a processor 300 and a memory 301. Those skilled in the art will understand that... Figure 12 This is merely an example of controller 30 and does not constitute a limitation on controller 30. It may include more or fewer components than shown, or combine certain components, or different components. For example, the controller may also include input / output devices, network access devices, buses, etc.

[0211] The processor 300 may be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor.

[0212] The memory 301 can be an internal storage unit of the controller 30, such as a hard disk or RAM of the controller 30. The memory 301 can also be an external storage device of the controller 30, such as a plug-in hard disk, Smart Media Card (SMC), Secure Digital (SD) card, or Flash Card equipped on the controller 30. Furthermore, the memory 301 can include both internal and external storage units of the controller 30. The memory 301 is used to store computer programs and other programs and data required by the controller. The memory 301 can also be used to temporarily store data that has been output or will be output.

[0213] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is merely an example. In practical applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiments can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit. Furthermore, the specific names of the functional units and modules are only for easy differentiation and are not intended to limit the scope of protection of this application. The specific working process of the units and modules in the above system can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0214] This application also provides a PCS test platform, including the controller 30 as described above, a first PCS module, and a second PCS module, both controlled by the controller. The AC sides of the first and second PCS modules are connected, and the AC side is also used for connection to the power grid. The DC side of the first PCS module is used for connection to a first energy storage battery, and the DC side of the second PCS module is used for connection to a second energy storage battery. In the above embodiments, the descriptions of each embodiment have different focuses. Parts not described in detail or in a certain embodiment can be referred to the relevant descriptions of other embodiments.

[0215] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0216] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0217] If integrated modules / units are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, all or part of the processes in the methods of the above embodiments can also be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when executed by a processor, it can implement the steps of the test method embodiments of the various battery devices described above. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. The computer-readable medium can include: any entity or device capable of carrying computer program code, recording media, USB flash drives, portable hard drives, magnetic disks, optical disks, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signals, telecommunication signals, and software distribution media, etc.

[0218] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A testing method for a battery device, characterized in that, The battery device includes a first energy storage battery and a second energy storage battery. The first energy storage battery is connected to the DC side of a first PCS module, and the second energy storage battery is connected to the DC side of a second PCS module. The AC side of the first PCS module and the AC side of the second PCS module are connected. The testing method includes: Upon receiving a test command, the first PCS module and the second PCS module are controlled to operate in different working modes to allow the power to flow back and forth between the first energy storage battery and the second energy storage battery. The working modes include constant power discharge mode and constant power charging mode. Specifically, when a first preset switching condition or a second preset switching condition is met, the first PCS module and the second PCS module are controlled to switch their working modes. The first preset switching condition includes the first energy storage battery being fully charged and the second energy storage battery being discharged, or the first energy storage battery being discharged and the second energy storage battery being fully charged. The second preset switching condition includes the change in the amount of charge of the first energy storage battery and the second energy storage battery being greater than or equal to a preset change. When the first PCS module and the second PCS module switch operating modes at least once, the first PCS module and the second PCS module are controlled to operate in different operating modes so that the power of the first energy storage battery reaches the first preset factory power and the power of the second energy storage battery reaches the second preset factory power.

2. The testing method for the battery device according to claim 1, characterized in that, When the first preset switching condition is met, the control of the first PCS module and the second PCS module to operate in different working modes, so that the power flows back and forth between the first energy storage battery and the second energy storage battery, including: The first PCS module is controlled to operate in a constant power discharge mode, and the second PCS module is controlled to operate in a constant power charging mode, so that the power in the first energy storage battery flows to the second energy storage battery. When the first energy storage battery is discharged and the second energy storage battery is fully charged, the first PCS module is controlled to operate in a constant power charging mode, and the second PCS module is controlled to operate in a constant power discharging mode, so that the power in the second energy storage battery flows to the first energy storage battery. When the first energy storage battery is fully charged and the second energy storage battery is discharged, the first PCS module is controlled to operate in a constant power discharge mode, and the second PCS module is controlled to operate in a constant power charging mode, so that the power in the first energy storage battery flows to the second energy storage battery.

3. The testing method for the battery device according to claim 2, characterized in that, The AC sides of both the first PCS module and the second PCS module are connected to the power grid, and the operating modes also include a power grid charging mode and a power grid discharging mode. The testing method also includes: When the first energy storage battery is discharged and the second energy storage battery is not fully charged, the first PCS module is controlled to shut down, and the second PCS module is controlled to operate in grid charging mode so that the grid charges the second energy storage battery until the second energy storage battery is fully charged. When the first energy storage battery is not fully charged and the second energy storage battery is discharged, the first PCS module is controlled to operate in grid charging mode, and the second PCS module is controlled to shut down, so that the grid charges the first energy storage battery until the first energy storage battery is fully charged. When the first energy storage battery is not discharged and the second energy storage battery is fully charged, the first PCS module is controlled to operate in grid discharge mode, and the second PCS module is controlled to shut down, so that the first energy storage battery discharges to the grid until the first energy storage battery is discharged. When the first energy storage battery is fully charged and the second energy storage battery is not discharged, the first PCS module is controlled to shut down, and the second PCS module is controlled to operate in grid discharge mode, so that the second energy storage battery discharges to the grid until the second energy storage battery is discharged.

4. The testing method for the battery device according to claim 3, characterized in that, The grid discharge mode is a constant power grid discharge mode with a preset grid discharge power, and the grid charging mode is a constant power grid charging mode with a preset grid charging power.

5. The test method for the battery device according to any one of claims 1 to 4, characterized in that, The constant power charging mode is a working mode that performs constant power charging with a preset battery charging power, and the constant power discharging mode is a working mode that performs constant power discharging with a preset battery discharging power.

6. The testing method for the battery device according to claim 1, characterized in that, Also includes: Upon receiving the first shutdown command, the system controls the first PCS module to shut down and controls the second PCS module to shut down within a first preset time period. Upon receiving the second shutdown command, the second PCS module is shut down, and the first PCS module is shut down within a second preset time period.

7. A testing apparatus for battery devices, characterized in that, The battery device includes a first energy storage battery and a second energy storage battery. The first energy storage battery is connected to the DC side of a first PCS module, and the second energy storage battery is connected to the DC side of a second PCS module. The AC side of the first PCS module and the AC side of the second PCS module are connected. The testing apparatus includes: The first control module is used to control the first PCS module and the second PCS module to work in different working modes when a test command is received, so that the power flows back and forth between the first energy storage battery and the second energy storage battery. The working modes include constant power discharge mode and constant power charging mode. Specifically, when a first preset switching condition or a second preset switching condition is met, the first PCS module and the second PCS module are controlled to switch their working modes. The first preset switching condition includes the first energy storage battery being fully charged and the second energy storage battery being discharged, or the first energy storage battery being discharged and the second energy storage battery being fully charged. The second preset switching condition includes the change in the amount of charge of the first energy storage battery and the second energy storage battery being greater than or equal to a preset change. The second control module is used to control the first PCS module and the second PCS module to work in different working modes when the first PCS module and the second PCS module switch working modes at least once, so that the power of the first energy storage battery reaches the first preset factory power and the power of the second energy storage battery reaches the second preset factory power.

8. A controller comprising a memory and a processor, wherein the memory stores a computer program executable on the processor, characterized in that, When the processor executes the computer program, it implements the steps of the test method for the battery device as described in any one of claims 1 to 6.

9. A PCS test platform, comprising a controller as described in claim 8, a first PCS module, and a second PCS module, wherein both the first PCS module and the second PCS module are controlled by the controller; The first PCS module and the second PCS module are connected on their AC sides, and the AC side is also used to connect to the power grid; the DC side of the first PCS module is used to connect to the first energy storage battery, and the DC side of the second PCS module is used to connect to the second energy storage battery.

10. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by a processor, it implements the steps of the test method for the battery device as described in any one of claims 1 to 6.

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