Charging and discharging testing device of energy storage battery system
By designing a charge-discharge test device that includes switching components and a converter, the compatibility issues of distributed and centralized energy storage battery systems were resolved, enabling the testing of battery systems with multiple voltage levels under the same device, thus improving the compatibility and flexibility of the test device.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SUNGROW POWER SUPPLY CO LTD
- Filing Date
- 2025-04-02
- Publication Date
- 2026-05-01
AI Technical Summary
In the existing technology, the charging and discharging test devices for distributed and centralized energy storage battery systems lack compatibility and cannot be tested under the same device.
A charge-discharge test device was designed, comprising a first switching component and a first energy storage converter. The device enables charge-discharge testing of centralized and distributed energy storage systems by switching the switching devices. Combined with a transformer and multiple switching components, it supports testing of battery systems with different voltage levels, thereby increasing compatibility.
It enables compatibility testing of centralized and distributed energy storage battery systems under the same device, improving the flexibility and compatibility of the testing device and supporting battery system testing at multiple voltage levels.
Smart Images
Figure CN224190204U_ABST
Abstract
Description
A charge / discharge testing device for an energy storage battery system Technical Field
[0001] This application relates to the field of testing technology, and in particular to a charge and discharge testing device for an energy storage battery system. Background Technology
[0002] With the advancement of global carbon neutrality, the development of energy storage battery systems is rapid. Charge-discharge testing, as one of the methods for stability control and testing of energy storage battery systems, is becoming increasingly important.
[0003] However, one testing system is used for charging and discharging tests of distributed energy storage battery systems, while another system is used for centralized energy storage battery systems. Therefore, improving the compatibility of charging and discharging testing equipment for energy storage battery systems is a technical problem that urgently needs to be solved in this field. Summary of the Invention
[0004] To address the aforementioned issues, this application provides a charge / discharge testing device for an energy storage battery system, thereby improving the compatibility of such devices.
[0005] The embodiments of this application disclose the following technical solutions:
[0006] In a first aspect, embodiments of this application provide a charge / discharge testing device for an energy storage battery system, a first switching assembly, and a first energy storage converter; the first end of the first switching device and the first end of the second switching device in the first switching assembly are connected together to AC power, the second end of the first switching device is used to connect to a first distributed energy storage battery system, the second end of the second switching device is connected to the first end of the first energy storage converter, and the second end of the first energy storage converter is used to connect to a first centralized energy storage battery system.
[0007] In one implementation, the charge / discharge testing device further includes: a first transformer, a first side of which is used to connect to alternating current, and a second side of which is connected to the first terminal of a first switching device and the first terminal of a second switching device; wherein the first side of the first transformer includes M taps, each of the M taps corresponding to a voltage level, and M is an integer greater than or equal to 2; the second side of the first transformer includes N taps, each of the N taps corresponding to a voltage level, and N is an integer greater than or equal to 2.
[0008] In one implementation, the charge / discharge test device further includes: a second switching assembly, which includes N switching devices; the first ends of the N switching devices are respectively connected to N taps in a one-to-one correspondence, and the second ends of the N switching devices are connected together and connected to the first end of the first switching device.
[0009] In one implementation, the charge / discharge test device further includes: a third switching assembly, which includes M switching devices; the first ends of the M switching devices are connected together and connected to AC power, and the second ends of the M switching devices are respectively connected to M taps one by one.
[0010] In one implementation, the first switching assembly further includes at least one third switching device; the first end of the third switching device, the first end of the first switching device, and the first end of the second switching device are connected together, and the second end of the third switching device is connected to the second distributed energy storage battery system in a corresponding manner.
[0011] In one implementation, the first switching assembly further includes at least one third switching device; the first end of the third switching device, the first end of the first switching device, and the first end of the second switching device are connected together, the second end of the third switching device is connected to the first end of the second energy storage converter in a one-to-one correspondence, the second end of each second energy storage converter is connected to the second centralized energy storage battery system in a one-to-one correspondence, or the second end of at least one second energy storage converter box is connected to the first centralized energy storage battery system, and the second ends of the remaining second energy storage converter boxes are connected to the second centralized energy storage battery system in a one-to-one correspondence.
[0012] In one implementation, the charge / discharge test apparatus for the energy storage battery system further includes: a fourth switching device, a fifth switching device, a second transformer, and a third transformer; the first end of the fourth switching device is used to connect to AC power, the second end of the fourth switching device is connected to the first side of the second transformer, and the second side of the second transformer is used to provide a first auxiliary power supply; the first end of the fifth switching device is used to connect to AC power, the second end of the fifth switching device is connected to the first side of the third transformer, and the second side of the third transformer is used to provide a second auxiliary power supply.
[0013] In one implementation, the charge and discharge testing device for the energy storage battery system further includes: a monitoring unit; the monitoring unit is used to monitor the charge and discharge process data of the distributed energy storage battery system and the centralized energy storage battery system; wherein the charge and discharge process data includes at least one of available power rate, charge and discharge efficiency, voltage, current and power.
[0014] In one implementation, the charge / discharge test device for the energy storage battery system further includes: a sixth switching device, a seventh switching device, and a resistor; the first end of the sixth switching device is connected to the second end of the fifth switching device, and the second end of the sixth switching device is connected to the first side of the third transformer; the first end of the seventh switching device is connected to the second end of the fifth switching device, and the second end of the seventh switching device is connected to the first end of the resistor, and the second end of the resistor is connected to the first side of the third transformer.
[0015] In one implementation, the charge and discharge test device for the energy storage battery system further includes: a power conversion circuit; the first terminal of the power conversion circuit is connected to the second terminal of the third transformer, and the second terminal of the power conversion circuit is used to provide a third auxiliary power supply.
[0016] To improve the compatibility of charge / discharge testing devices for energy storage battery systems, this application provides a charge / discharge testing device for an energy storage battery system. The device includes a first switching assembly and a first energy storage converter. The first terminals of a first switching device and a second switching device in the first switching assembly are connected together to AC power. The second terminal of the first switching device is used to connect to a first centralized distributed energy storage battery system. The second terminal of the second switching device is connected to the first terminal of the first energy storage converter, and the second terminal of the first energy storage converter is used to connect to a first centralized energy storage battery system. In this application embodiment, the first switching assembly switches between the centralized energy storage system and the distributed energy storage system under test, allowing both systems to be tested using the same charge / discharge testing device, thus improving the compatibility of the energy storage battery system's charge / discharge testing device. Attached Figure Description
[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, 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 is a schematic diagram of a charge and discharge test device for an energy storage battery system provided in an embodiment of this application;
[0019] Figure 2 is a schematic diagram of another charge and discharge test device for an energy storage battery system provided in an embodiment of this application;
[0020] Figure 3 is a schematic diagram of a charge and discharge test device for an energy storage battery system provided in an embodiment of this application;
[0021] Figure 4 is a schematic diagram of a charge and discharge test device for another energy storage battery system provided in an embodiment of this application;
[0022] Figure 5 is a schematic diagram of a charge and discharge test device for an energy storage battery system provided in an embodiment of this application;
[0023] Figure 6 is a schematic diagram of an auxiliary power supply circuit provided in an embodiment of this application;
[0024] Figure 7 is a schematic diagram of another auxiliary power supply circuit provided in an embodiment of this application. Detailed Implementation
[0025] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.
[0026] The terms "first" and "second," etc., used in the specification and claims of this application are used to distinguish different objects, not to describe a specific order of objects. For example, "first switching device" and "second switching device," etc., are used to distinguish different switching devices, not to describe a specific order of switching devices.
[0027] In the embodiments of this application, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design that is described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of the terms "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.
[0028] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, embodiments of this application will be described below in conjunction with the accompanying drawings.
[0029] Referring to Figure 1, this figure is a schematic diagram of a charge and discharge test device for an energy storage battery system provided in an embodiment of this application.
[0030] As shown in Figure 1, the charge / discharge test device 1000 includes: a first switch group 100 and a first energy storage converter 200; wherein, the first end of the first switch device K1 and the first end of the second switch device K2 in the first switch group 100 are connected together to connect to AC power, the second end of the first switch device K2 is used to connect to the first distributed energy storage battery system 2000, the second end of the second switch device K2 is connected to the first end of the first energy storage converter 200, and the second end of the first energy storage converter 200 is used to connect to the first centralized energy storage battery system 3000.
[0031] In this embodiment, turning on the first switching device in the first switching assembly enables charge and discharge testing of a distributed energy storage battery system; turning on the second switching device in the first switching assembly enables charge and discharge testing of a centralized energy storage battery system. Thus, charge and discharge tests can be performed on both distributed and centralized energy storage battery systems simultaneously under the same testing device, improving the compatibility of the charge and discharge testing device.
[0032] To meet the charging and discharging test requirements of distributed energy storage battery systems with different voltage levels, or centralized energy storage battery systems with different voltage levels, this application provides another charging and discharging test device.
[0033] Referring to Figure 2, this figure is a schematic diagram of another charge-discharge test device provided in an embodiment of this application.
[0034] As shown in Figure 2, the charge / discharge test device 1000 includes: a third switch assembly 400, a first transformer T1, a second switch assembly 300, a first switch assembly 100, and a first energy storage converter 200. The third switching assembly 400 includes M switching devices (KQ1, KQ2...KQM). The first ends of the M switching devices are connected together to connect to AC power. The second ends of the M switching devices are respectively connected to the M taps on the first side of the first transformer T1. The N taps on the second side of the first transformer T1 are respectively connected to the first ends of the N switching devices (KP1, KP2, KP3...KPN) in the second switching assembly 300. The second ends of the N switching devices are connected together and connected to the first ends of the first switching device K1 and the first ends of the second switching device K2 in the first switching assembly 100. The second end of the first switching device K1 is used to connect to the first distributed energy storage battery system 200. The second end of the second switching device K2 is connected to the first end of the first energy storage converter 200. The second end of the first energy storage converter 200 is used to connect to the first centralized energy storage battery system 3000.
[0035] Where M is an integer greater than or equal to 1, and N is an integer greater than or equal to 2.
[0036] For example, in the embodiments of this application, the windings on the first side of the first transformer T1 are connected in a delta connection, and the windings on the second side of the first transformer T1 are connected in a star connection.
[0037] It should be understood that each of the M taps of the first transformer T1 corresponds to a voltage level, and each of the N taps corresponds to a voltage level. Therefore, the first transformer T1 can output M*N different voltage levels.
[0038] For example, taking M=3 and N=4 as an example, the voltage level corresponding to tap M1 is 790.625V, tap M2 is 690V, tap M3 is 612V, and the output voltage levels corresponding to taps N1, N2, N3, and N4 in the first transformer T1 are shown in Table 1 below:
[0039] Table 1
[0040]
[0041] In this embodiment, by introducing a first transformer, distributed energy storage battery systems of different voltage levels and centralized energy storage battery systems of different voltage levels can be charged and discharged through the charge and discharge test device in this embodiment, thereby further improving the compatibility of the charge and discharge test device.
[0042] Furthermore, to facilitate charging and discharging tests on more energy storage battery systems, the first switching assembly 100 may also include at least one third switching device, based on the aforementioned embodiments.
[0043] In one possible implementation, the first ends of the third switching device, the second switching device, and the first switching device are connected together, and the second ends of the third switching device are connected to the corresponding second distributed energy storage battery systems. As shown in Figure 3, the first switching assembly 100 includes third switching devices (K31, K32...K3N), the first ends of the third switching devices (K31, K32...K3N), the first ends of the second switching device K2, and the first ends of the first switching device K1 are connected together, and the second ends of the third switching devices (K31, K32...K3N) are respectively used to connect to the corresponding second distributed energy storage battery systems 4000.
[0044] It should be understood that the voltage levels of the first distributed energy storage battery system and the second distributed energy storage battery system can be different. Therefore, distributed energy storage battery systems with different voltage levels can be tested using the same charge and discharge test device, thereby improving the compatibility of the charge and discharge test device.
[0045] In one possible implementation, the first ends of the third switching device, the second switching device, and the first switching device are connected together. The second end of the third switching device is connected to the first end of the second energy storage converter in a one-to-one correspondence. The second end of each second energy storage converter is connected to the second centralized energy storage battery system in a one-to-one correspondence. As shown in Figure 4, the first switching assembly 100 includes a third switching device (K31, K32...K3N). The first ends of the third switching device (K31, K32...K3N), the first ends of the second switching device K2, and the first ends of the first switching device K1 are connected together. The second ends of the third switching device (K31, K32...K3N) are connected to the first end of the second energy storage converter 500. The second ends of the second energy storage converter 500 are respectively used to connect to the corresponding second centralized battery energy storage system 5000.
[0046] It should be understood that the voltage levels of the first centralized energy storage battery system and the second centralized energy storage battery system can be different. Consequently, centralized energy storage battery systems with different voltage levels can be tested using the same charge and discharge test device, thereby improving the compatibility of the charge and discharge test device.
[0047] In one possible implementation, the first end of the third switching device, the first end of the second switching device, and the first end of the first switching device are connected together, the second end of the third switching device is connected to the first end of the second energy storage converter in a one-to-one correspondence, the second end of at least one second energy storage converter is connected to the first centralized energy storage battery system, and the second ends of the other second energy storage converters are connected to the second centralized energy storage battery system in a one-to-one correspondence. As shown in Figure 5, the first switching assembly 100 includes a third switching device (K31, K32...K3N). The first end of the third switching device (K31, K32...K3N), the first end of the second switching device K2, and the first end of the first switching device K1 are connected together. The second end of the third switching device (K31, K32...K3N) is connected to the first end of the second energy storage converter 500. The second end of the second energy storage converter 500 (the second converter 500 connected to the third switching device K3N) is used to connect to the first centralized battery energy storage system 3000. The second ends of the other second energy storage converters 500 (the second energy storage converters 500 connected to the third switching devices K31, K32...K3(N-1)) are respectively used to connect to the corresponding second centralized energy storage battery system 5000.
[0048] It should be understood that the first centralized energy storage battery system can be connected to the first transformer T1 through different energy storage converters. In the event of a failure of the first energy storage converter, the first centralized energy storage battery system can be charged and discharged through the second energy storage converter, thereby improving the flexibility and compatibility of the charge and discharge test device.
[0049] In addition, to facilitate the observation of the charge and discharge test results of the energy storage battery system (centralized energy storage battery system and distributed energy storage battery system), the charge and discharge test device of the energy storage battery system in this application embodiment further includes: a monitoring unit.
[0050] The monitoring unit is used to monitor the charging and discharging process data of the energy storage battery system; the charging and discharging process data includes at least one of the following: available power rate, charging and discharging efficiency, voltage, current and power.
[0051] To reduce the number of external power supplies required for the charging and discharging equipment, the charging and discharging test device in this embodiment may also include an auxiliary power supply circuit.
[0052] The auxiliary power supply circuit draws power from AC power and converts the electrical energy into power for the controller, the first switch assembly, the second switch assembly, the third switch assembly, the first energy storage converter, the second energy storage converter, the first centralized energy storage battery system, the second centralized energy storage battery system, the first distributed energy storage battery system, the second distributed energy storage battery system, the monitoring unit, and external equipment.
[0053] In one possible implementation, as shown in Figure 6, the auxiliary power supply circuit 600 includes a fourth switching device K4, a fifth switching device K5, a second transformer T2, and a third transformer T3; the first terminal of the fourth switching device K4 is connected to AC power, and the second terminal of the fourth switching device K4 is connected to the first terminal of the second transformer T2, which provides a first auxiliary power source 1; the first terminal of the fifth switching device K5 is connected to AC power, and the second terminal of the fifth switching device K5 is connected to the first terminal of the third transformer T3, which provides a second auxiliary power source 2.
[0054] In this embodiment, the first auxiliary power supply can be used to power the controller and the fifth switching device K5 so that the controller can control the fifth switching device K5 to be turned on or off.
[0055] For example, the second transformer T2 can be a 2KVA single-phase isolation transformer, and the third transformer T3 can be a 150KVA isolation transformer.
[0056] For example, the first side of the third transformer T3 is connected in a delta configuration, and the second side of the third transformer T3 is connected in a star configuration.
[0057] Further, referring to Figure 6, the first terminal of contactor KM8 is connected to the second terminal of the third transformer T3, and the second terminal of contactor KM8 is connected to the first terminal of circuit breaker K8. The second terminal of circuit breaker K8 provides a second auxiliary power source 2 (the second auxiliary power source 2 can supply power to the first switching device K1, the second switching device K2, and the third switching device K3 in the first switching assembly); the first terminal of contactor KM9 is connected to the second terminal of the third transformer T3, and the second terminal of contactor KM9 is connected to the first terminal of circuit breaker K9. The second terminal of circuit breaker K9 provides a second auxiliary power source 2 (the second auxiliary power source 2 can supply power to N switching devices in the second switching assembly). In addition, the second terminal of the third transformer T3 can also be connected to the first terminal of contactor KM10, and the second terminal of contactor KM10 is connected to the first terminal of circuit breaker K10. The second terminal of circuit breaker K10 provides a second auxiliary power source 2 (which can supply power to the lighting system and the temperature control system); the second terminal of the third transformer T3 can also be connected to the first terminal of contactor KM11, and the second terminal of contactor KM11 is connected to the first terminal of circuit breaker K11. The second terminal of circuit breaker K11 provides a second auxiliary power source 2 (which can supply power to the monitoring unit); the third The second end of transformer T3 can also be connected to the first end of contactor KM12 and the first end of contactor KM13. The second end of contactor KM12 is connected to the first end of circuit breaker K12. The second end of circuit breaker K12 is connected to the first end of AC / AC power conversion unit. The second end of AC / AC power conversion unit is connected to the first end of contactor KM14. The second end of contactor KM14 and the second end of circuit breaker K12 are connected to the first end of circuit breaker K13. The second end of circuit breaker K13 provides a third auxiliary power source 3 (the third auxiliary power source 3 can supply power to the electrical equipment on the product side) connected to the power supply terminal on the product side.
[0058] The auxiliary power supply (first auxiliary power supply, second auxiliary power supply and third auxiliary power supply) provided by the auxiliary power supply circuit makes the power supply of the charge and discharge test device independent, and is powered by a set of main circuits. In the event of a power trip, all auxiliary power supplies are disconnected, thus improving the safety of the charge and discharge device.
[0059] In addition, as shown in Figure 7, the auxiliary power supply circuit 600 may also include a soft-start circuit 610, which includes a sixth switching device K6, a seventh switching device K7, and a resistor R1. Specifically, the first terminal of the sixth switching device K6 is connected to the second terminal of the fifth switching device K5, and the second terminal of the sixth switching device K6 is connected to the third transformer T3; the first terminal of the seventh switching device K7 is connected to the second terminal of the fifth switching device K5, and the second terminal of the seventh switching device K7 is connected to the first terminal of the resistor R1, and the second terminal of the resistor R1 is connected to the third transformer T3.
[0060] When the fifth switching device K5 is turned on, the sixth switching device K6 is turned on. After a preset time T, the seventh switching device K7 is turned on and the sixth switching device K6 is turned off, thereby realizing the slow start-up control of the auxiliary power supply circuit, which slows down the rise rate of output voltage and current, effectively reducing the risk of overvoltage and overcurrent, and reducing the risk of damage to circuit components.
[0061] The above description is merely one specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.
Claims
1. A charge / discharge testing device for an energy storage battery system, characterized in that, include: A first switching assembly and a first energy storage converter; the first end of the first switching device and the first end of the second switching device in the first switching assembly are connected together to AC power, the second end of the first switching device is used to connect to a first distributed energy storage battery system, the second end of the second switching device is connected to the first end of the first energy storage converter, and the second end of the first energy storage converter is used to connect to a first centralized energy storage battery system.
2. The charge / discharge testing device according to claim 1, characterized in that, The charge / discharge testing device further includes: a first transformer, a first side of which is used to connect to the alternating current, and a second side of which is connected to the first terminal of the first switching device and the first terminal of the second switching device; wherein, the first side of the first transformer includes M taps, each of the M taps corresponding to a voltage level, and M is an integer greater than or equal to 2; the second side of the first transformer includes N taps, each of the N taps corresponding to a voltage level, and N is an integer greater than or equal to 2.
3. The charge / discharge testing device according to claim 2, characterized in that, The charge / discharge testing device further includes: a second switching assembly, which includes N switching devices; the first ends of the N switching devices are respectively connected to the N taps one by one, and the second ends of the N switching devices are connected together and connected to the first end of the first switching device.
4. The charge / discharge testing device according to claim 2, characterized in that, The charge / discharge test device further includes: a third switch assembly, which includes M switching devices; the first ends of the M switching devices are connected together and connected to the AC power, and the second ends of the M switching devices are respectively connected to the M taps one by one.
5. The charge / discharge testing apparatus according to any one of claims 1-4, characterized in that, The first switching assembly further includes at least one third switching device; the first end of each of the third switching devices, the first end of the first switching device, and the first end of the second switching device are connected together, and the second end of each of the third switching devices is respectively connected to each of the second distributed energy storage battery systems.
6. The charge / discharge testing apparatus according to any one of claims 1-4, characterized in that, The first switching assembly further includes at least one third switching device; the first ends of each of the third switching devices, the first ends of the first switching device, and the first ends of the second switching devices are connected together, the second ends of each of the third switching devices are respectively connected to the first ends of each of the second energy storage converters, and the second ends of each of the second energy storage converters are respectively connected to each of the second centralized energy storage battery systems, or the second end of at least one of the second energy storage converters is connected to the first centralized energy storage battery system, and the second ends of the remaining second energy storage converters are respectively connected to each of the second centralized energy storage battery systems.
7. The charge / discharge testing apparatus according to any one of claims 1-4, characterized in that, The charge / discharge testing device for the energy storage battery system further includes: a fourth switching device, a fifth switching device, a second transformer, and a third transformer; the first end of the fourth switching device is used to connect to the AC power, the second end of the fourth switching device is connected to the first side of the second transformer, and the second side of the second transformer is used to provide a first auxiliary power supply; the first end of the fifth switching device is used to connect to the AC power, the second end of the fifth switching device is connected to the first side of the third transformer, and the second side of the third transformer is used to provide a second auxiliary power supply.
8. The charge / discharge testing apparatus according to any one of claims 1-4, characterized in that, The charging and discharging testing device for the energy storage battery system further includes: a monitoring unit; the monitoring unit is used to monitor the charging and discharging process data of the distributed energy storage battery system and the centralized energy storage battery system; wherein, the charging and discharging process data includes at least one of available power rate, charging and discharging efficiency, voltage, current and power.
9. The charge / discharge testing apparatus according to claim 7, characterized in that, The charge / discharge test device for the energy storage battery system further includes: a sixth switch device, a seventh switch device, and a resistor; the first end of the sixth switch device is connected to the second end of the fifth switch device, and the second end of the sixth switch device is connected to the first side of the third transformer; the first end of the seventh switch device is connected to the second end of the fifth switch device, and the second end of the seventh switch device is connected to the first end of the resistor, and the second end of the resistor is connected to the first side of the third transformer.
10. The charge / discharge testing apparatus according to claim 7, characterized in that, The charging and discharging test device for the energy storage battery system further includes: a power conversion circuit; the first end of the power conversion circuit is connected to the second end of the third transformer, and the second end of the power conversion circuit is used to provide a third auxiliary power supply.