Battery compartment test system

Abstract

The invention provides a battery compartment test system. The system comprises a first energy storage converter, a second energy storage converter, a first battery compartment and a second battery compartment, the first energy storage converter is used for controlling the states of the first direct-current circuit breaker and the first alternating-current circuit breaker according to the detected first direct-current side voltage; the second energy storage converter is used for controlling the states of the second direct-current circuit breaker and the second alternating-current circuit breaker according to the detected second direct-current side voltage and the detected alternating-current side voltage; when the first direct-current circuit breaker, the second direct-current circuit breaker, the first alternating-current circuit breaker and the second alternating-current circuit breaker are all closed, charging and discharging power is set, and charging and discharging testing is conducted on the first battery cabin and the second battery cabin. According to the technical scheme provided by the embodiment of the invention, an opposite dragging test mode is adopted, a power grid does not need to be accessed when charging and discharging tests are carried out on the battery cabins, charging and discharging tests can be carried out on the two battery cabins at the same time, the test period is shortened, and the test efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of battery testing, and in particular to a battery compartment testing system. Background Art

[0002] With the continuous development of new energy, clean energy such as wind and light are connected to the power grid in large quantities, and energy storage technology plays a vital role in the power system. It not only helps to balance the output of renewable energy and improve the stability of the power grid, but also optimizes the operation of the power system, supports microgrids and distributed energy systems, and overcomes the difference between energy supply and demand. Therefore, energy storage technology has been vigorously developed. As an important power source or load device in energy storage products, the performance of the energy storage DC cabin directly affects the system performance and reliability of the energy storage product. Therefore, the battery cabin must undergo initial charge and discharge tests before leaving the factory to achieve performance evaluation and reliability verification of the battery cabin.

[0003] In the related technology, the traditional testing method is to directly connect the energy storage inverter to the box-type substation in the factory area to perform charging and discharging tests on the battery compartment. This testing method consumes a lot of electricity and is inefficient. The testing conditions are relatively harsh. The relevant test platform needs to have a large enough capacity and the low-voltage side voltage level must meet the experimental conditions of the energy storage inverter. Summary of the invention

[0004] In view of the above problems, an embodiment of the present invention provides a battery compartment testing system to solve the problems in the prior art of consuming a large amount of electric energy, being inefficient, and having harsh testing conditions.

[0005] An embodiment of the present invention provides a battery compartment testing system, the system comprising a first energy storage converter, a second energy storage converter, a first battery compartment and a second battery compartment;

[0006] The first energy storage converter is used to control the states of the first DC circuit breaker and the first AC circuit breaker according to the detected first DC side voltage;

[0007] The second energy storage inverter is used to control the states of the second DC circuit breaker and the second AC circuit breaker according to the detected second DC side voltage and AC side voltage; when the first DC circuit breaker, the second DC circuit breaker, the first AC circuit breaker and the second AC circuit breaker are all closed, the charging and discharging power is set to perform charging and discharging tests on the first battery compartment and the second battery compartment.

[0008] In a possible implementation, the charging and discharging power includes charging power and discharging power;

[0009] The second energy storage inverter is specifically used to set the charging power to charge the second battery compartment through the first battery compartment until the first battery compartment is fully discharged and the second battery compartment is fully charged; or, to set the discharging power to charge the first battery compartment through the second battery compartment until the first battery compartment is fully charged and the second battery compartment is fully discharged.

[0010] In a possible implementation, the first energy storage inverter is electrically connected to the second energy storage inverter through the first AC circuit breaker and the second AC circuit breaker; the first AC circuit breaker and the second AC circuit breaker are used to control the connection or disconnection of the first energy storage inverter and the second energy storage inverter.

[0011] In one possible implementation, when the first AC circuit breaker and the second AC circuit breaker are both closed, the first phase of the first energy storage inverter is electrically connected to the first phase of the second energy storage inverter; the second phase of the first energy storage inverter is electrically connected to the second phase of the second energy storage inverter; and the third phase of the first energy storage inverter is electrically connected to the third phase of the second energy storage inverter.

[0012] In a possible implementation, the first energy storage converter is electrically connected to the first battery compartment through the first DC circuit breaker; the second energy storage converter is electrically connected to the second battery compartment through the second DC circuit breaker;

[0013] The first DC circuit breaker is used to control the connection or disconnection between the first energy storage inverter and the first battery compartment; the second DC circuit breaker is used to control the connection or disconnection between the second energy storage inverter and the second battery compartment.

[0014] In a possible implementation, the first energy storage converter has a first positive electrode and a first negative electrode, the second energy storage converter has a second positive electrode and a second negative electrode, the first battery compartment has a third positive electrode and a third negative electrode, and the second battery compartment has a fourth positive electrode and a fourth negative electrode;

[0015] When the first DC circuit breaker is closed, the first positive electrode is electrically connected to the third positive electrode, and the first negative electrode is electrically connected to the third negative electrode;

[0016] When the second DC circuit breaker is closed, the second positive electrode is electrically connected to the fourth positive electrode, and the second negative electrode is electrically connected to the fourth negative electrode.

[0017] In a possible implementation, the first energy storage converter is specifically configured to start the off-grid mode in response to a received off-grid mode setting instruction, and when it is detected that the first DC side voltage is within a preset first voltage interval, control the first DC side circuit breaker and the first AC side circuit breaker to close;

[0018] The second energy storage inverter is specifically used to start the control mode in response to the received control mode setting instruction, and when it is detected that the second DC side voltage is within the first voltage range and the AC side voltage is within the preset second voltage range, control the second DC side circuit breaker and the second AC side circuit breaker to close.

[0019] In a possible implementation, the system further includes a host computer;

[0020] The host computer is used to send the off-grid mode setting instruction to the first energy storage converter, and send the control mode setting instruction to the second energy storage converter.

[0021] In a possible implementation, the first battery compartment includes a first battery cluster and a first battery management system BMS, and the second battery compartment includes a second battery cluster and a second BMS;

[0022] The first BMS is used to detect battery information of the first battery cluster during a charge and discharge test;

[0023] The second BMS is used to detect battery information of the second battery cluster during a charge and discharge test.

[0024] In a possible implementation manner, the battery information includes at least one of temperature, charging current, discharging current, charging voltage, and discharging voltage.

[0025] In the technical solution provided by the embodiment of the present invention, a pair-drag test method is adopted, and there is no need to connect to the power grid when performing charge and discharge tests on the battery compartments, and charge and discharge tests can be performed on two battery compartments at the same time, which shortens the test cycle and improves the test efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic diagram of a battery compartment testing system provided in an embodiment of the present invention.

[0027] Figure 2 A flow chart of a battery compartment testing method provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the present invention clearer and more understandable, the present invention is further described below in conjunction with the accompanying drawings and specific implementation methods. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] Figure 1 A schematic diagram of a battery compartment testing system provided by an embodiment of the present invention is shown in FIG. Figure 1 As shown, the system includes a first energy storage inverter, a second energy storage inverter, a first battery compartment and a second battery compartment; the first energy storage inverter is used to control the states of the first DC circuit breaker and the first AC circuit breaker according to the detected first DC side voltage; the second energy storage inverter is used to control the states of the second DC circuit breaker and the second AC circuit breaker according to the detected second DC side voltage and AC side voltage; when the first DC circuit breaker, the second DC circuit breaker, the first AC circuit breaker and the second AC circuit breaker are all closed, the charging and discharging power is set, and the charging and discharging tests are performed on the first battery compartment and the second battery compartment.

[0030] In an embodiment of the present invention, the charge and discharge power includes the charge power and the discharge power; the second energy storage inverter is specifically used to set the charge power so as to charge the second battery compartment through the first battery compartment until the first battery compartment is fully discharged and the second battery compartment is fully charged; or, set the discharge power so as to charge the first battery compartment through the second battery compartment until the first battery compartment is fully charged and the second battery compartment is fully discharged. Among them, the maximum power of the charge and discharge power depends on the maximum power of the second energy storage inverter, and the charge and discharge power is less than or equal to the maximum power of the second energy storage inverter. For example, when the maximum power of the second energy storage inverter is 1250kW, the charge and discharge power is less than or equal to 1250kW.

[0031] In an embodiment of the present invention, the first energy storage inverter is electrically connected to the second energy storage inverter through the first AC circuit breaker and the second AC circuit breaker, and the first AC circuit breaker and the second AC circuit breaker are used to control the connection or disconnection of the first energy storage inverter and the second energy storage inverter. The first AC circuit breaker, the second AC circuit breaker, the first energy storage inverter and the second energy storage inverter are connected through connecting cables, and the connecting cables include cables or copper busbars. When the first energy storage inverter and the second energy storage inverter are connected through the copper busbar, subsequent movement is convenient, so that other battery compartments can be connected through the first energy storage inverter and the second energy storage inverter, and charge and discharge tests can be performed on other battery compartments, thereby improving the efficiency of battery compartment testing.

[0032] Specifically, the first AC circuit breaker and the second AC circuit breaker include three circuit breakers respectively, and each circuit breaker is used to control the connection or disconnection of one phase between the first energy storage converter and the second energy storage converter. The states of the three circuit breakers in the first AC circuit breaker are consistent. When the first AC circuit breaker is closed, the three circuit breakers are all closed; when the first AC circuit breaker is disconnected, the three circuit breakers are all disconnected. The states of the three circuit breakers in the second AC circuit breaker are consistent. When the second AC circuit breaker is closed, the three circuit breakers are all closed; when the second AC circuit breaker is disconnected, the three circuit breakers are all disconnected.

[0033] Specifically, the first energy storage converter and the second energy storage converter are both three-phase energy storage converters. When the first AC circuit breaker and the second AC circuit breaker are both closed, the first phase of the first energy storage converter is electrically connected to the first phase of the second energy storage converter; the second phase of the first energy storage converter is electrically connected to the second phase of the second energy storage converter; the third phase of the first energy storage converter is electrically connected to the third phase of the second energy storage converter. For example, the first phase is phase A, the second phase is phase B, and the third phase is phase C.

[0034] In the embodiment of the present invention, when the first AC circuit breaker and the second AC circuit breaker are both closed, the first energy storage converter is short-circuited with the second energy storage converter. At this time, it is inconvenient for the auxiliary transformer in the energy storage converter to obtain power, which may cause the auxiliary transformer to be unable to normally supply power to the auxiliary equipment. Based on this, the upper connection of the auxiliary transformer is removed, and an external 380V AC voltage is connected to power the auxiliary transformer to ensure normal power consumption of the auxiliary equipment.

[0035] In an embodiment of the present invention, the first energy storage inverter is electrically connected to the first battery compartment through a first DC circuit breaker; the second energy storage inverter is electrically connected to the second battery compartment through a second DC circuit breaker; the first DC circuit breaker is used to control the connection or disconnection of the first energy storage inverter and the first battery compartment; the second DC circuit breaker is used to control the connection or disconnection of the second energy storage inverter and the second battery compartment.

[0036] Specifically, the first DC circuit breaker includes two circuit breakers, and the states of the two circuit breakers are consistent. When the first DC circuit breaker is closed, the two circuit breakers in the first DC circuit breaker are closed; when the first DC circuit breaker is disconnected, the two circuit breakers in the first DC circuit breaker are disconnected. The second DC circuit breaker includes two circuit breakers, and the states of the two circuit breakers are consistent. When the second DC circuit breaker is closed, the two circuit breakers in the second DC circuit breaker are closed; when the second DC circuit breaker is disconnected, the two circuit breakers in the second DC circuit breaker are disconnected.

[0037] Specifically, the first energy storage converter has a first positive electrode and a first negative electrode, the second energy storage converter has a second positive electrode and a second negative electrode, the first battery compartment has a third positive electrode and a third negative electrode, and the second battery compartment has a fourth positive electrode and a fourth negative electrode. A plurality of contacts are provided on the first positive electrode, the first negative electrode, the second positive electrode, the second negative electrode, the third positive electrode, the third negative electrode, the fourth positive electrode and the fourth negative electrode. When the first DC circuit breaker is closed, the first positive electrode is electrically connected to the third positive electrode, and the first negative electrode is electrically connected to the third negative electrode; when the second DC circuit breaker is closed, the second positive electrode is electrically connected to the fourth positive electrode, and the second negative electrode is electrically connected to the fourth negative electrode.

[0038] In an embodiment of the present invention, the first energy storage converter is specifically used to start the off-grid mode in response to the received off-grid mode setting instruction, and when it is detected that the first DC side voltage is within the preset first voltage interval, the first DC side circuit breaker and the first AC side circuit breaker are controlled to be closed. The second energy storage converter is specifically used to start the control mode in response to the received control mode setting instruction, and when it is detected that the second DC side voltage is within the first voltage interval and the AC side voltage is within the preset second voltage interval, the second DC side circuit breaker and the second AC side circuit breaker are controlled to be closed. Correspondingly, when the first energy storage converter detects that the first DC side voltage is outside the preset first voltage interval, the first DC side circuit breaker and the first AC side circuit breaker are controlled to be disconnected. When the second energy storage converter detects that the second DC side voltage is outside the first voltage interval, and / or the AC side voltage is outside the preset second voltage interval, the second DC side circuit breaker and the second AC side circuit breaker are controlled to be disconnected. The AC side voltage is the voltage of the AC side of the second energy storage converter, the first voltage interval is used to indicate the normal voltage range of the DC side voltage, and the second voltage interval is used to indicate the normal voltage range of the AC side voltage.

[0039] In the embodiment of the present invention, when the first energy storage converter is in the off-grid mode and the second energy storage converter is in the control mode, the entire battery compartment test system does not need to be connected to the power grid. It only needs to set the charge and discharge power through the second energy storage converter to perform charge and discharge tests on the first battery compartment and the second battery compartment, thereby realizing the towing test of the first battery compartment and the second battery compartment, that is, realizing the test control of the battery compartment. At this time, the first energy storage converter does not participate in the test control of the battery compartment.

[0040] Specifically, when the first energy storage converter detects that the first DC side voltage is within a preset first voltage interval, it automatically controls the first DC side circuit breaker to close, and controls the first AC side circuit breaker to close after stable operation.

[0041] In an embodiment of the present invention, the battery compartment testing system further includes a host computer, which is used to send an off-grid mode setting instruction to the first energy storage inverter and send a control mode setting instruction to the second energy storage inverter.

[0042] In an embodiment of the present invention, the first battery compartment includes a first battery cluster and a first battery management system (BMS), and the second battery compartment includes a second battery cluster and a second BMS; the first BMS is used to detect battery information of the first battery cluster during the charge and discharge test; the second BMS is used to detect battery information of the second battery cluster during the charge and discharge test. The battery information includes at least one of temperature, charging current, discharging current, charging voltage, and discharging voltage. Each battery cluster includes a plurality of battery modules, and each battery module includes a plurality of single cells. For example, the charging voltage includes a battery cluster charging voltage, a battery module charging voltage, and a single cell charging voltage.

[0043] In the embodiment of the present invention, the battery information of the battery compartment during the charge and discharge test is detected by the BMS, which can not only avoid overcharging, overdischarging or overtemperature of the battery and realize battery protection in the battery compartment, but also determine whether the performance of the battery compartment meets the test requirements through the battery information. For example, it is possible to determine whether the performance of the battery compartment meets the test requirements through the inter-cluster voltage difference of the battery cluster. When the inter-cluster voltage difference of the battery cluster is less than the preset threshold, it indicates that the voltage difference between the single cells is small and meets the test requirements; when the inter-cluster voltage difference of the battery cluster is greater than or equal to the preset threshold, it indicates that the voltage difference between the single cells is large and does not meet the test requirements. For example, the preset threshold is 350mV. By controlling the inter-cluster voltage difference of the battery cluster within a reasonable range, the energy distribution in the battery cluster is more uniform, which can effectively improve the performance and life of the battery cluster and improve the reliability of the battery compartment.

[0044] In the prior art, when conducting a battery compartment performance test, it is necessary to connect to the power grid, and only one battery compartment can be tested for charge and discharge at a time. In the embodiment of the present invention, the test method of the battery compartment is optimized, and a pair-to-drag test method is adopted, which does not require connection to the power grid, and can perform charge and discharge tests on two battery compartments at the same time. The performance test of the battery compartment is achieved without connecting to the power grid, which saves the electric energy lost by connecting to the power grid to test the battery compartment and reduces the test conditions for the charge and discharge test. At the same time, there is no need to connect to the power grid during the test, which protects the stability of the power distribution in the factory area and is safer and more convenient.

[0045] In the technical solution provided by the embodiment of the present invention, a pair-drag test method is adopted, and there is no need to connect to the power grid when performing charge and discharge tests on the battery compartments, and charge and discharge tests can be performed on two battery compartments at the same time, which shortens the test cycle and improves the test efficiency.

[0046] Figure 2 A flowchart of a battery compartment testing method provided by an embodiment of the present invention is shown in FIG. Figure 2 As shown, the method includes:

[0047] Step 101: A first energy storage converter controls states of a first DC circuit breaker and a first AC circuit breaker according to a detected first DC side voltage.

[0048] Each step in the embodiment of the present invention is applied to a battery compartment testing system. For a specific description, reference may be made to the above-mentioned embodiment of the battery compartment testing system. For the sake of brevity, the description will not be repeated here.

[0049] Step 102: The second energy storage inverter controls the states of the second DC circuit breaker and the second AC circuit breaker according to the detected second DC side voltage and AC side voltage; when the first DC circuit breaker, the second DC circuit breaker, the first AC circuit breaker and the second AC circuit breaker are all closed, the charge and discharge power is set, and the charge and discharge test is performed on the first battery compartment and the second battery compartment.

[0050] In the technical solution provided by the embodiment of the present invention, a pair-drag test method is adopted, and there is no need to connect to the power grid when performing charge and discharge tests on the battery compartments, and charge and discharge tests can be performed on two battery compartments at the same time, which shortens the test cycle and improves the test efficiency.

[0051] An embodiment of the present invention provides a computer-readable storage medium, which includes a stored program, wherein when the program is running, the device where the computer-readable storage medium is located is controlled to execute the steps of the embodiment of the above-mentioned battery compartment testing method. For a specific description, please refer to the embodiment of the above-mentioned battery compartment testing method.

[0052] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A battery compartment testing system, characterized in that: The system includes a first energy storage converter, a second energy storage converter, a first battery compartment and a second battery compartment; The first energy storage converter is used to control the states of the first DC circuit breaker and the first AC circuit breaker according to the detected first DC side voltage; The second energy storage inverter is used to control the states of the second DC circuit breaker and the second AC circuit breaker according to the detected second DC side voltage and AC side voltage; when the first DC circuit breaker, the second DC circuit breaker, the first AC circuit breaker and the second AC circuit breaker are all closed, the charging and discharging power is set to perform charging and discharging tests on the first battery compartment and the second battery compartment.

2. The system according to claim 1, characterized in that The charging and discharging power includes charging power and discharging power; The second energy storage inverter is specifically used to set the charging power to charge the second battery compartment through the first battery compartment until the first battery compartment is fully discharged and the second battery compartment is fully charged; or, to set the discharging power to charge the first battery compartment through the second battery compartment until the first battery compartment is fully charged and the second battery compartment is fully discharged.

3. The system according to claim 1, characterized in that The first energy storage inverter is electrically connected to the second energy storage inverter through the first AC circuit breaker and the second AC circuit breaker; the first AC circuit breaker and the second AC circuit breaker are used to control the connection or disconnection of the first energy storage inverter and the second energy storage inverter.

4. The system according to claim 1, characterized in that When the first AC circuit breaker and the second AC circuit breaker are both closed, the first phase of the first energy storage inverter is electrically connected to the first phase of the second energy storage inverter; the second phase of the first energy storage inverter is electrically connected to the second phase of the second energy storage inverter; and the third phase of the first energy storage inverter is electrically connected to the third phase of the second energy storage inverter.

5. The system according to claim 1, characterized in that The first energy storage converter is electrically connected to the first battery compartment via the first DC circuit breaker; the second energy storage converter is electrically connected to the second battery compartment via the second DC circuit breaker; The first DC circuit breaker is used to control the connection or disconnection between the first energy storage inverter and the first battery compartment; the second DC circuit breaker is used to control the connection or disconnection between the second energy storage inverter and the second battery compartment.

6. The system according to claim 1, characterized in that The first energy storage converter has a first positive electrode and a first negative electrode, the second energy storage converter has a second positive electrode and a second negative electrode, the first battery compartment has a third positive electrode and a third negative electrode, and the second battery compartment has a fourth positive electrode and a fourth negative electrode; When the first DC circuit breaker is closed, the first positive electrode is electrically connected to the third positive electrode, and the first negative electrode is electrically connected to the third negative electrode; When the second DC circuit breaker is closed, the second positive electrode is electrically connected to the fourth positive electrode, and the second negative electrode is electrically connected to the fourth negative electrode.

7. The system according to claim 1, characterized in that The first energy storage converter is specifically configured to start the off-grid mode in response to the received off-grid mode setting instruction, and control the first DC side circuit breaker and the first AC side circuit breaker to close when it is detected that the first DC side voltage is within a preset first voltage interval; The second energy storage inverter is specifically used to start the control mode in response to the received control mode setting instruction, and when it is detected that the second DC side voltage is within the first voltage range and the AC side voltage is within the preset second voltage range, control the second DC side circuit breaker and the second AC side circuit breaker to close.

8. The system according to claim 7, characterized in that The system also includes a host computer; The host computer is used to send the off-grid mode setting instruction to the first energy storage converter, and send the control mode setting instruction to the second energy storage converter.

9. The system according to claim 1, characterized in that The first battery compartment includes a first battery cluster and a first battery management system BMS, and the second battery compartment includes a second battery cluster and a second BMS; The first BMS is used to detect battery information of the first battery cluster during a charge and discharge test; The second BMS is used to detect battery information of the second battery cluster during a charge and discharge test.

10. The system according to claim 9, characterized in that The battery information includes at least one of temperature, charging current, discharging current, charging voltage, and discharging voltage.

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