Energy storage system

Abstract

An energy storage system, relating to the technical field of energy storage. The energy storage system comprises an energy storage converter and an electrical cabinet, wherein the energy storage converter is located within the electrical cabinet; the energy storage converter comprises a power module; and the power module comprises: a plurality of power units and a plurality of capacitor units, wherein the plurality of power units and the plurality of capacitor units are alternately arranged in a first direction. This allows for a power unit to be inserted between two capacitor units, so as to fully utilize a gap between the capacitor units to mount the power unit, which allows for a compact structure, saves space when compared with using a separate space for mounting capacitor units, and increases energy storage converter power density.

Description

Energy storage system

[0001] This application claims priority to Chinese Patent Application No. 202422926020.3, filed with the Chinese Patent Office on November 28, 2024, entitled "Electrical Cabinet and Energy Storage System," the entire contents of which are incorporated herein by reference. This application also claims priority to Chinese Patent Application No. 202411999901.6, filed with the Chinese Patent Office on December 31, 2024, entitled "A Power Module, Energy Storage Converter, and Energy Storage System," the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of energy storage technology, and more specifically, to an energy storage system. Background Technology

[0003] With the development of new energy power generation such as wind power and photovoltaic power generation, battery energy storage systems can now be used to store the electrical energy generated by new energy power generation.

[0004] Energy storage converters are an important component of battery energy storage systems. They act as an interface between the battery packs of new energy sources and the power grid, enabling bidirectional energy exchange between the two.

[0005] Existing energy storage converters use side-mounted bus capacitors, which requires dedicated space for the installation of these capacitors. However, as the power of energy storage converters increases, the size, weight, and number of bus capacitors also increase. The side-mounting method of the bus capacitors limits the improvement of the power density of energy storage converters. Summary of the Invention

[0006] The purpose of this application is to provide a technical solution that can improve the power density of energy storage converters.

[0007] This application discloses an energy storage system, including an energy storage converter and an electrical cabinet, wherein the energy storage converter is located inside the electrical cabinet;

[0008] The energy storage converter includes a power module;

[0009] The power module includes:

[0010] Multiple power units and multiple capacitor units are arranged alternately along a first direction.

[0011] Based on the above technical solution, the power module includes multiple power units and multiple capacitor units. The multiple power units and multiple capacitor units are arranged alternately along the first direction. Based on this, the power unit is inserted between two capacitor units. Therefore, this application can make full use of the gap between capacitor units to install the power unit. The structure is compact. Compared with using independent space to install capacitor units, it can save space and thus improve the power density of the energy storage converter. Attached Figure Description

[0012] Figure 1 is a topology diagram of a power converter provided in an embodiment of this application;

[0013] Figure 2 is a schematic diagram of the structure of a power module provided in an embodiment of this application;

[0014] Figure 3 is a schematic diagram of the structure of a power module provided in an embodiment of this application;

[0015] Figure 4 is a schematic diagram of a stacked busbar provided in an embodiment of this application;

[0016] Figure 5a is a schematic diagram of the connection between a stacked busbar and a power unit in the prior art;

[0017] Figure 5b is a schematic diagram of the connection between a stacked busbar and a power unit provided in an embodiment of this application;

[0018] Figure 6 is an axial view of a power module provided in an embodiment of this application;

[0019] Figure 7 is a side view of a power module provided in an embodiment of this application;

[0020] Figure 8 is an exploded view of a power module provided in an embodiment of this application;

[0021] Figure 9 is a schematic diagram of a capacitor unit provided in an embodiment of this application;

[0022] Figure 10a is a schematic diagram of the structure of a capacitor unit for a low-power energy storage converter provided in an embodiment of this application;

[0023] Figure 10b is a schematic diagram of the structure of a capacitor unit for a high-power energy storage converter provided in an embodiment of this application;

[0024] Figure 11 is a schematic diagram of the structure between a first heat dissipation unit and a first support frame provided in an embodiment of this application;

[0025] Figure 12 is a second side view of a power module provided in an embodiment of this application;

[0026] Figure 13 is a comparison diagram of the power volumetric energy density of a power module provided in the embodiment of this application and a power module in the prior art;

[0027] Figure 14 is a schematic diagram of the structure of an electrical cabinet provided in some embodiments of this application;

[0028] Figure 15 is a second schematic diagram of the structure of the electrical cabinet provided in some embodiments of this application;

[0029] Figure 16 is a third schematic diagram of the electrical cabinet provided in some embodiments of this application;

[0030] Figure 17 is a fourth schematic diagram of the electrical cabinet provided in some embodiments of this application;

[0031] Figure 18 is a fifth schematic diagram of the electrical cabinet provided in some embodiments of this application;

[0032] Figure 19 is a schematic diagram of the electrical cabinet provided in some embodiments of this application (the sixth one).

[0033] Figure 20 is a seventh structural schematic diagram of an electrical cabinet provided in some embodiments of this application;

[0034] Figure 21 is a schematic diagram of the structure of an electrical cabinet provided in some embodiments of this application (eighth one).

[0035] Figure 22 is a schematic diagram of the structure of an electrical connector provided in some embodiments of this application;

[0036] Figure 23 is a second schematic diagram of the structure of an electrical connector provided in some embodiments of this application;

[0037] Figure 24 is a schematic diagram of the top cover structure provided in some embodiments of this application.

[0038] Explanation of reference numerals in the attached drawings: A - First direction; B - Second direction; 1 - Cabinet; 11 - External circulation compartment; 111 - First vent; 112 - Second vent; 12 - Internal circulation compartment; 121 - First part; 122 - Second part; 13 - Spacer; 14 - Base; 141 - Air inlet; 15 - Top cover; 16 - Door; 17 - Cabinet; 10 - Power unit; 101 - Power device; 2 - First fan; 20 - Capacitor unit; 201 - First support frame; 202 - Capacitor component; 3 - First surface cooler; 30 - Conductive connection structure; 301 - Conductive plate; 302 - Conductive connection bar; 3021 - Conductive connection end; 4 - Second fan; 40 - Frame; 5 - Liquid cooling radiator; 50 - Control unit; 6 - Second surface cooler; 60 - Pre-charge and discharge unit; 7 - Heat exchange pipeline; 70 - Wiring harness interface unit; 8-Reactor; 80-Copper busbar; 9-Second electronic device; 91-Power module; 92-DC disconnect switch; 93-AC circuit breaker; 94-Electrical connector; 941-First connector; 942-Second connector; 901-First heat dissipation unit; 9011-Second support frame; 9012-First cooling fan; 902-Second heat dissipation unit; 9021-Mounting plate; 9022-Second cooling fan. Detailed Implementation

[0039] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present disclosure.

[0040] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this disclosure or its application or use.

[0041] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0042] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0043] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0044] Although operations or steps are described in a specific order in the accompanying drawings in the embodiments of this disclosure, it should not be construed as requiring these operations or steps to be performed in the specific order or serial order shown, or requiring all of the shown operations or steps to be performed to obtain the desired result. In the embodiments of this disclosure, these operations or steps may be performed serially; they may be performed in parallel; or a portion of these operations or steps may be performed.

[0045] In the description of the embodiments of this disclosure, unless otherwise stated, prefixes such as "first" and "second" are used only to distinguish different descriptive objects and do not constitute restrictions on the position, order, priority, quantity, or content of the descriptive objects. The description of the descriptive objects is given in the context of the claims or embodiments, and the use of prefixes should not constitute unnecessary restrictions. For example, if the descriptive object is "information," the ordinal numbers preceding "information" in "first information" and "second information" do not restrict the position or order of the "information." "First" and "second" do not restrict whether the "information" they modify is in the same message, nor do they restrict the order of "first information" and "second information."

[0046] In the description of the embodiments of this disclosure, unless otherwise stated, "multiple" means two or more, and other quantifiers are similar; "at least one," "one or more," or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one 'a' can represent any number of 'a's; as another example, one or more of a, b, and c can represent: a, b, c, ab, ac, bc, or abc, where a, b, and c can be single or multiple; "and / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, and B alone, where A and B can be singular or plural. The character " / " indicates that the preceding and following related objects are in an "or" relationship.

[0047] In the description of the embodiments of this disclosure, unless otherwise stated, elements expressed in a singular form can be understood as either a singular or a plural expression. For example, "a," "an," "the," "the," "described," "the foregoing," "this," etc., can mean "one and only one," or "one or more," "at least one," etc.

[0048] In the description of the embodiments disclosed herein, unless otherwise stated, the terms "greater than", "greater than or equal to", "not less than", "more than", "more than or equal to", "not less than", "higher than", "higher than or equal to", "not lower than", and "above" can be used interchangeably, and the terms "less than", "less than or equal to", "not greater than", "less than", "less than or equal to", "not more than", "lower than", "lower than or equal to", "not higher than", and "below" can be used interchangeably.

[0049] With the increasing application of new energy power generation such as wind power and photovoltaic power generation, and given the randomness of the output power of new energy power generation, battery energy storage systems are currently used to store the electrical energy generated by new energy power generation.

[0050] Energy storage converters are an important component of battery energy storage systems, acting as an interface between new energy battery packs and the power grid to achieve bidirectional energy exchange between the two. This mainly includes two processes: rectification and inversion. The rectification process converts the input alternating current (AC) into direct current (DC), while the inversion process converts the DC into AC output.

[0051] Figure 1 is a schematic diagram of a power converter topology, including a DC side, a pre-charge and discharge unit, an EMC (Electromagnetic Compatibility) filter unit, a DC sampling unit, an IGBT (Insulated Gate Bipolar Transistor) module, an LC filter unit, an AC sampling unit, and an AC side. The high-power converter receives stable DC power input from the DC side. After processing by the pre-charge and discharge unit, the EMC filter unit, and the DC sampling unit, the IGBT module performs power conversion. The LC filter unit then filters out high-frequency harmonics and noise, and finally, the DC sampling unit outputs high-quality AC power to the AC side.

[0052] The DC side is usually connected to a DC power source such as a battery pack. The DC side can be inverted into AC power by an IPM (Intelligent Power Module). The AC side is usually connected to the power grid or other loads. The AC side can be rectified into DC power by an IPM to charge and store energy for the energy storage battery.

[0053] The precharge and discharge unit is used to precharge the bus capacitor before the power converter starts up and safely discharge the residual charge in the bus capacitor after shutdown, so as to protect the components in the energy storage converter from damage by impulse voltage.

[0054] EMC filtering units are used to suppress electromagnetic interference and electromagnetic compatibility issues. They are used to filter out electromagnetic interference signals from the converter within a specific frequency range, ensuring the normal operation of the energy storage converter and its surrounding equipment.

[0055] The DC sampling unit is used to monitor parameters such as voltage and current on the DC side in real time, providing feedback signals for the battery energy storage system.

[0056] An IGBT module typically consists of an IGBT chip, thermal paste, a driver circuit, and a protection circuit. The IGBT chip is the core of the switching element. The thermal paste ensures the normal operating temperature of the IGBT chip. The driver circuit receives control signals and drives the IGBT chip to switch, and also monitors the operating status of the IGBT and provides protection in abnormal situations.

[0057] The LC filter unit is used to filter out high-frequency harmonics and noise in the inverter output, thereby improving the quality of the output power.

[0058] The AC sampling unit is used to monitor parameters such as AC voltage and current output by the inverter in real time, providing feedback signals to the control system.

[0059] The AC side is the output terminal of the converter, which is connected to the power grid or load.

[0060] The complex internal component layout of existing energy storage converters necessitates the disassembly of numerous parts during maintenance, resulting in cumbersome operations, inconvenient maintenance, and long maintenance times. This not only increases maintenance costs but also reduces availability.

[0061] Furthermore, the existing energy storage converters use side-mounted bus capacitors, which require dedicated space for installation. As the power of energy storage converters increases, the size, weight, and number of bus capacitors also increase. Therefore, the bus capacitors limit the increase in power density of energy storage converters. Moreover, the side-mounted bus capacitors are suspended structures, which are inconvenient to install and maintain due to gravity.

[0062] Based on this, the inventive concept of this application is to integrate the easily damaged components inside the energy storage converter into an independent module, and to readjust the layout of the capacitor unit and the power unit within the module so as to make the layout of the capacitor unit and the power unit compact, thereby improving the power density of the energy storage converter.

[0063] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.

[0064] Based on this, this application provides an energy storage system, including an energy storage converter and an electrical cabinet, wherein the energy storage converter is located inside the electrical cabinet and includes a power module.

[0065] Referring to FIG2, a schematic diagram of a power module provided in an embodiment of this application is shown. The power module is applied in an energy storage converter and includes multiple power units 10 and multiple capacitor units 20.

[0066] Multiple power units 10 and multiple capacitor units 20 are arranged alternately along the first direction A.

[0067] It should be understood that, in this embodiment, multiple power units 10 and multiple capacitor units 20 can be arranged alternately according to the number of power units 10 and the number of capacitor units 20.

[0068] The power unit 10 may include power devices, such as IGBTs, MOSFETs, and diodes, for converting electrical energy from one form to another. For example, converting direct current (DC) to alternating current (AC), or vice versa.

[0069] The power unit 10 can also adjust the output voltage and current to meet load requirements.

[0070] In the energy storage system, the power unit 10 can manage the storage and release of energy and optimize energy utilization efficiency.

[0071] The capacitor unit 20 can be a bus capacitor unit, used to smooth the current waveform to reduce the current stress on the power unit 10, thereby improving the reliability and lifespan of the power unit 10.

[0072] In some examples, the number of power units 10 is less than or equal to the number of capacitor units 20, in which case each power unit 10 can be arranged alternately with a capacitor unit 20.

[0073] In some examples, the number of power units 10 is greater than the number of capacitor units 20. In such cases, some power units 10 may be arranged alternately with capacitor units 20, and some power units may be arranged sequentially after capacitor units along the first direction.

[0074] Based on the above description, the power module in this embodiment includes multiple power units and multiple capacitor units, which are arranged alternately along a first direction. Since the power units are inserted between two capacitor units, this application can fully utilize the gaps between capacitor units to install the power units, resulting in a compact structure. Compared to using separate spaces to install capacitor units, this saves space and thus improves the power density of the energy storage converter. Furthermore, compared to the side-mounted structure of the capacitor units, it solves the problem of capacitor unit sag.

[0075] Furthermore, this embodiment can effectively smooth voltage fluctuations and protect power units from overvoltage through reasonable configuration of capacitor units, thereby improving the reliability of the power module. The alternating arrangement of multiple power units and multiple capacitor units may also help to distribute heat more evenly, simplifying the thermal management design of the power module and energy storage converter, and improving heat dissipation efficiency. In an optional embodiment, referring to FIG3, the power module provided in this embodiment may further include a conductive connection structure 30, with multiple power units 10 and multiple capacitor units 20 disposed on the same side of the conductive connection structure and all electrically connected to the conductive connection structure 30.

[0076] Placing multiple power units and capacitor units on the same side of the conductive connection structure can make the power module more compact, reducing the overall size of the power module and making it suitable for applications with limited installation space.

[0077] In this embodiment, the conductive connection structure 30 is used to realize the electrical connection between multiple capacitor units 20 and multiple power units. The conductive connection structure here serves as a centralized electrical connection point, electrically connecting multiple power units and capacitor units together. This reduces the length of the connection path, thereby reducing resistance and inductance and optimizing electrical performance. Furthermore, this vertical stacking method saves space, making the power module structure more compact.

[0078] In some alternative embodiments, the conductive connection structure 30 can be a multilayer busbar. A multilayer busbar consists of multiple conductive layers, typically separated by an insulating material. By tightly stacking the conductive layers, the multilayer busbar can significantly reduce parasitic inductance, reduce voltage spikes and switching noise from multiple power units, thereby improving the electrical performance of the power module.

[0079] Optionally, referring to Figure 3, a conductive connection structure is disposed above the plurality of power units 10 and the plurality of capacitor units 20, and is electrically connected to both the plurality of capacitor units 20 and the plurality of power units 10.

[0080] It should be understood that Figure 3 is an example of the placement of a conductive connection structure. The conductive connection structure can also be placed at other locations of the multiple power units 10 and multiple capacitor units 20. This application embodiment does not impose any special limitations on this.

[0081] Optionally, referring to FIG4, the conductive connection structure 30 includes a conductive plate 301 and a plurality of conductive connection rows 302.

[0082] Multiple conductive connection bars 302 are arranged at intervals along a first direction on the side of the conductive plate 301 facing the power unit; the conductive plate 301 is electrically connected to the multiple conductive connection bars 302 and the multiple capacitor units 20 respectively; the multiple conductive connection bars 302 are also electrically connected to the multiple power units one by one.

[0083] The conductive plate 301 is made of a highly conductive material (such as copper or aluminum) to provide a low-resistance electrical path. The conductive plate 301 is electrically connected to multiple conductive connection bars 302 and capacitor units 20 to form an integrated electrical network.

[0084] The conductive connection bar 302 is electrically connected to the conductive plate 301 and is electrically connected to each power unit in a corresponding manner to ensure that each power unit can obtain a stable electrical connection.

[0085] Based on this, this embodiment provides a low-resistance and low-inductance electrical connection through the combined design of the conductive plate 301 and the conductive connection bar 302, reducing electrical losses and voltage spikes. Furthermore, the low parasitic inductance and resistance characteristics between the conductive plate 301 and the conductive connection bar 302 improve the switching efficiency and dynamic response capability of the power module.

[0086] Furthermore, the above setup simplifies the installation process of the power module, reduces the possibility of wiring errors, and makes maintenance and replacement more convenient.

[0087] Referring to Figure 5a, a schematic diagram of the connection between a conductive connection structure and a power unit in the prior art is shown. When a copper busbar is used to connect the conductive connection structure and the power unit, the distance from different rated power units to the conductive connection structure is different, R = ρ * l / s, where R is the resistance, ρ is the resistivity of the material, l is the conductor length, and s is the cross-sectional area of ​​the conductor. When copper busbars with the same cross-sectional area are used for connection, the different resistances caused by different loop lengths lead to current sharing problems. Existing solutions all use software to eliminate this problem, but they cannot fundamentally eliminate it.

[0088] Based on this, referring to Figure 4 or Figure 5b, the power unit 10 of this embodiment includes a plurality of power devices 101, and the conductive connection bar 302 includes a plurality of conductive connection ends 3021. Each conductive connection bar 302 has a plurality of conductive connection ends 3021 that are electrically connected to a plurality of power devices 101 of the corresponding power unit 10.

[0089] In this embodiment, the conductive connection structure is disposed above the power unit. When the conductive connection structure is connected to the power unit in the vertical direction, the distance between the power device 101 in each power unit and the corresponding conductive connection row 302 in the conductive connection structure is the same. That is, conductive connection ends 3021 with the same length and cross-sectional area can be used to ensure that the connection loop resistance and current between each plurality of conductive connection ends 3021 and the corresponding plurality of power devices 101 are the same. The current sharing problem is solved structurally. Therefore, the power module in this embodiment has a good current sharing effect.

[0090] Based on the above description, the multiple conductive connection terminals 3021 have the same structure so that the current flowing through the multiple conductive connection terminals is the same.

[0091] In some examples, multiple power units are arranged in parallel.

[0092] It should be understood that parallel power units can achieve balanced current distribution, enabling each power unit to handle the same current load, reducing the overload risk of individual units, and improving the reliability and efficiency of energy storage converters to a certain extent.

[0093] Furthermore, the parallel arrangement of multiple power units can help distribute heat and reduce the heat load of a single unit.

[0094] In other examples, the number of capacitor cells between every two power cells is the same.

[0095] By placing the same number of capacitors between every two power units, circuit symmetry and balance can be achieved, ensuring uniform distribution of current and voltage across the power units. This helps smooth voltage fluctuations, reduce ripple current, and thus improve the voltage stability and dynamic response of the energy storage converter. Furthermore, uniformly distributing capacitors among the power units effectively suppresses electromagnetic interference.

[0096] The above content mainly describes the positional and connection relationships between power units, capacitor units, and conductive connection structures in the power module. The following content provides a detailed description of the overall architecture and specific implementation methods of the power module.

[0097] Optionally, referring to Figures 6, 7 and 8, the power module further includes a frame 40, in which multiple capacitor units 20 and multiple power units 10 are alternately arranged along a first direction A within the frame 40.

[0098] In this embodiment, a frame 40 is provided within the power module to provide physical support and protection for multiple capacitor units 20 and multiple power units 10. This protects the capacitor units 20 and power units 10 from mechanical shocks, vibrations, and external environmental influences, ensuring that they maintain a stable relative position during transportation, installation, and operation. Simultaneously, the frame 40 optimizes the overall layout and performance of the module, making the power module design clearer and facilitating installation and maintenance. Integrating multiple units within a single frame 40 reduces installation complexity and wiring errors.

[0099] Furthermore, the frame 40 can optimize the layout of components inside the power module, improve space utilization, and achieve high-density power modules.

[0100] Optionally, conductive connection structures are mounted on the frame to improve the overall integration of the power module.

[0101] Multiple capacitor units 20 are detachably connected to the side of the frame 40 near the conductive connection structure 30 and disposed within the frame.

[0102] It should be understood that the detachable connection makes the maintenance and replacement of capacitor unit 20 more convenient. That is, when replacing capacitor unit 20, individual components can be replaced without disassembling the entire power module, which can reduce the maintenance cost and downtime of the power module. Moreover, the detachable connection allows for flexible adjustment or expansion of the capacitor unit configuration according to the needs of the energy storage converter, in order to adapt to different application scenarios and load conditions.

[0103] The capacitor unit 20 is detachably connected to the side of the frame 40 near the conductive connection structure 30 to reduce the electrical path between the capacitor unit 20 and the conductive connection structure 30, improve electrical efficiency, and achieve a reliable connection between the conductive connection structure and the capacitor unit, thereby improving the overall performance and reliability of the module.

[0104] It should be further understood that placing the capacitor unit 20 on the side of the frame 40 close to the conductive connection structure 30 helps to dissipate heat from the capacitor unit 20 by utilizing natural convection, thereby reducing the operating temperature of the capacitor unit, improving its service life, and optimizing the utilization of internal space, allowing other components (such as the power unit 10) to be better arranged, thus improving the overall compactness of the module.

[0105] Optionally, multiple power units 10 can be detachably mounted on the side of the frame 40 away from the conductive connection structure 30 and disposed within the frame 40.

[0106] Based on this, multiple capacitor units 20 and multiple power units 10 are arranged separately to make more efficient use of the space within the frame 40, thereby enabling the power module to achieve a higher degree of integration.

[0107] In one example, to achieve higher integration of the power module, multiple power units are detachably mounted along a second direction on the side of the frame 40 away from the conductive connection structure 30. The second direction B is perpendicular to the first direction A.

[0108] It should be understood that the detachable connection makes the maintenance and replacement of power unit 10 more convenient. That is, when replacing power unit 10, individual components can be replaced without disassembling the entire power module, which can reduce the maintenance cost and downtime of the power module. Moreover, the detachable connection allows for flexible adjustment or expansion of the capacitor unit configuration according to the needs of the energy storage converter, in order to adapt to different application scenarios and load conditions.

[0109] Optionally, multiple power units 10 are slidably mounted along the second direction B on the side of the frame 40 away from the conductive connection structure 30, so that the power units 10 can be inserted into or removed from the frame 40, simplifying the installation and disassembly process of the power units 10, reducing the installation time and complexity of the power units 10. When the power units 10 need maintenance or replacement, the sliding connection method can slide the power module outside the entire frame 40 for maintenance and replacement of the power module without disassembling the entire module.

[0110] By detachably mounting the power unit 10 along the second direction on the side of the frame away from the conductive connection structure 30, while arranging the capacitor unit and the power unit 10 along the first direction, this orthogonal layout can maximize the use of the internal space of the frame and improve the power density of the module.

[0111] The specific locations of the multiple capacitor units and multiple power units have been described above. The specific structures of the multiple capacitor units and multiple power units will be described in detail below.

[0112] First, the structure of the capacitor unit is described:

[0113] Optionally, referring to FIG9, the capacitor unit includes a first support frame 201 and at least one capacitor element 202. At least one capacitor element 202 is disposed in the first support frame 201, the first support frame 201 is detachably connected to the side of the frame near the conductive connection structure 30, and at least one capacitor element 202 is electrically connected to the conductive connection structure 30.

[0114] The first support frame is used to house and secure at least one capacitor unit. It provides the necessary mechanical support and protection for the capacitor unit, ensuring its stability within the module. The first support frame is detachably connected to the frame, which facilitates the installation and maintenance of the capacitor unit, allowing for individual component replacement without disassembling the entire module. This helps reduce maintenance costs and downtime.

[0115] Referring to Figures 10a and 10b, this embodiment addresses different power requirements of the power module by replacing capacitor units of different sizes. For example, high-power energy storage converters use smaller, longer capacitors, while low-power energy storage converters use larger, shorter capacitors to meet the corresponding power design requirements. When replacing capacitor units, the overall structure of the power module does not need to be changed; only the capacitor support dimensions need to be altered for capacitor placement to achieve different power ranges, demonstrating strong scalability. Higher power output can be achieved without altering the overall structure, meaning higher power can be output within the same area, resulting in higher power density for the power module.

[0116] Optionally, the power module further includes multiple first heat dissipation units, each corresponding to a capacitor unit. Each first heat dissipation unit is disposed on one side of a first support frame corresponding to the capacitor unit, and is used to dissipate heat from the corresponding capacitor unit.

[0117] In some examples, a first heat dissipation unit is set for each capacitor unit, that is, multiple first heat dissipation units are set one-to-one with multiple capacitor units. Based on this, heat dissipation can be achieved for each capacitor unit to ensure the overall performance of the power module.

[0118] In this embodiment, by placing the heat dissipation unit directly adjacent to the capacitor unit, the heat generated by the capacitor can be effectively conducted and dissipated quickly, preventing overheating. This allows the capacitor to operate stably at higher power levels, improving the overall performance and efficiency of the module.

[0119] Optionally, the first heat dissipation unit can be detachably connected to one side of the first support frame.

[0120] Based on this, the first heat dissipation unit can be disassembled for maintenance or replacement when the first heat dissipation unit is being maintained or replaced. The entire maintenance and replacement process does not require disassembling the power module, resulting in high replacement efficiency and reduced maintenance costs and downtime.

[0121] In an optional embodiment, referring to FIG11, the first heat dissipation unit 901 is disposed on the bottom of the first support frame on the side opposite to the capacitor component 202.

[0122] Furthermore, the first heat dissipation unit 901 and the bottom of the first support frame 201 on the side opposite to the capacitor are detachably connected.

[0123] Based on this, the first heat dissipation unit can directly dissipate heat from the capacitor components through the bottom of the support frame, which improves the overall heat dissipation efficiency and ensures that the capacitor components operate within the optimal temperature range.

[0124] Optionally, referring to Figures 11 and 12, the first heat dissipation unit 901 includes a second support frame 9011 and a first heat dissipation fan 9012. The first heat dissipation fan 9012 is disposed in the second support frame 9011 and the air outlet direction is towards the capacitor unit. The second support frame 9011 is detachably connected to the bottom of the first support frame 201.

[0125] The number of the first cooling fan 9012 can be specifically set according to the spatial location and heat dissipation requirements; this embodiment does not impose specific limitations on this.

[0126] The first cooling fan 9012 directs its airflow towards the capacitor components, enabling it to quickly remove heat from the capacitor components and the surrounding air, thus improving heat dissipation efficiency.

[0127] The second support frame 9011 is used to accommodate and fix at least one first cooling fan 9012, providing necessary mechanical support for the first cooling fan 9012 and ensuring the stability of the first cooling fan 9012 in the power module. The second support frame 9011 is slidably connected to one side of the first support frame 201, facilitating the maintenance of the first heat dissipation unit.

[0128] The second support frame can be detachably installed from the first support frame in the following ways:

[0129] The first support frame has a first mounting part at its bottom and the second support frame has a second mounting part at its top. The second support frame is mounted on the bottom of the first support frame through the second mounting part and the first mounting part.

[0130] Optionally, the second support frame can be slidably connected to one side of the first support frame to improve replacement or maintenance efficiency.

[0131] Based on this, the first mounting part can be a guide rail, and the second mounting part can be a slider. The slider cooperates with the guide rail to achieve a sliding connection between the first support frame and the second support frame.

[0132] The first mounting part can also be a groove, and the second mounting part can be a flange. The groove and the flange cooperate to realize the sliding connection between the first support frame and the second support frame.

[0133] The first mounting part can also be a telescopic rod, and the second mounting part can be a locking mechanism. The telescopic rod and the locking mechanism cooperate to realize the sliding connection between the first support frame and the second support frame.

[0134] Based on the above structure, the second support frame can be slidably connected to the first support frame.

[0135] The structure and heat dissipation of the capacitor unit have been described above. The following content describes the power unit:

[0136] The power unit includes a third support frame and at least one power device. The at least one power device is disposed in the third support frame. The third support frame is detachably mounted on the side of the frame away from the conductive connection structure 30, and the at least one power device is electrically connected to the conductive connection structure 30 from the side of the frame 40 close to the conductive connection structure 30.

[0137] Based on this, the electrical path between the power device and the conductive connection structure 30 can be reduced, electrical efficiency can be improved, and a reliable connection between the conductive connection structure and the power unit can be achieved, thereby improving the overall performance and reliability of the module.

[0138] It should be understood that the aforementioned third support frame is used to accommodate and fix at least one power device, providing necessary mechanical support and protection for at least one power device and ensuring the stability of the power device in the power module.

[0139] Among them, power devices may include IGBTs (Insulated Gate Bipolar Transistors), MOSFETs (Field Effect Transistors), or other types of power semiconductor devices, which are responsible for the conversion and control of electrical energy.

[0140] The third support frame is detachably installed at the bottom of the frame, allowing for individual replacement and maintenance. When maintenance or replacement of power devices is required, only the power devices can be replaced without disassembling the entire module.

[0141] Specifically, the third support frame can be detachably installed at the bottom of the frame in the following ways:

[0142] The bottom of the third support frame has a third mounting part, and the side of the frame near the conductive connection structure has a fourth mounting part. The third support frame can be detachably mounted to the frame through the third mounting part and the fourth mounting part.

[0143] Optionally, the third mounting portion is slidably disposed on the fourth mounting portion. This allows the third support frame to be inserted into or removed from the frame, simplifying the installation and disassembly process of the power device. Furthermore, when maintenance or replacement of the power device is required, the sliding connection method allows for replacement of only the power device without disassembling the entire module.

[0144] The third mounting part can be a guide rail, and the fourth mounting part can be a slider. The slider cooperates with the guide rail to achieve a sliding connection between the third support frame and the bottom of the frame.

[0145] The third mounting part can also be a groove, and the fourth mounting part can be a flange. The groove and the flange cooperate to realize the sliding connection between the third support frame and the bottom of the frame.

[0146] The third mounting part can also be a telescopic rod, and the fourth mounting part can be a locking mechanism. The telescopic rod and the locking mechanism cooperate to achieve a sliding connection between the third support frame and the bottom of the frame.

[0147] Based on the above structure, the third support frame can be slidably connected to the bottom of the frame.

[0148] Optionally, the power unit further includes a heat exchanger, which is disposed in the corresponding third support frame and is used to exchange heat with the corresponding at least one power device.

[0149] Specifically, the heat exchanger is installed in the third support frame, directly adjacent to or in contact with the power device, to achieve efficient heat conduction.

[0150] The heat exchanger can take various forms, such as fins, heat pipes, liquid cooling plates, or other highly efficient heat dissipation structures. This third support frame not only provides mechanical support but also integrates the heat exchanger to optimize thermal management.

[0151] In one optional embodiment, the heat exchanger is a liquid cooling plate, and the power unit further includes a first baffle and / or a second baffle, wherein the first baffle is disposed at the liquid inlet of the liquid cooling plate, and / or the second baffle is disposed at the liquid outlet of the liquid cooling plate.

[0152] This embodiment utilizes a liquid cooling plate as a heat exchanger, employing the flow of liquid (typically water or coolant) to remove the heat generated by the power devices. The liquid cooling plate can be made of a high thermal conductivity material, such as copper or aluminum, and its internal design incorporates flow channels to optimize liquid flow and heat exchange efficiency.

[0153] The first baffle is located at the liquid inlet of the liquid cooling plate and can be used to regulate and guide the inflow of coolant, ensuring that the liquid is evenly distributed in the flow channel of the liquid cooling plate.

[0154] The second baffle is located at the outlet of the liquid cooling plate and can be used to regulate and guide the flow of coolant, ensuring that the flow rate and volume of the liquid are optimized when it flows through the liquid cooling plate.

[0155] Furthermore, the first and second baffles mentioned above are also used to prevent the liquid cooling plate interface from bursting open due to pressure or other reasons, causing damage to power devices, short circuits, and other hazards.

[0156] The first and second baffles mentioned above can be made of PVC material.

[0157] In some examples, referring to FIG12, the power module may further include a second heat dissipation unit 902, which is fixedly connected to the frame 40, and the air outlet of the second heat dissipation unit 902 faces upward of the power unit 10.

[0158] The second heat dissipation unit 902 is fixedly connected to the frame 40, which can provide stable mechanical support for the second heat dissipation unit 902.

[0159] The air outlet of the second heat dissipation unit 902 faces upwards towards the power unit, ensuring that cool air flows directly to the area where the power device is located. This arrangement can form effective air convection and improve heat dissipation efficiency.

[0160] Specifically, as described above, the first heat dissipation unit 901 is used to dissipate heat from the bottom of the bus unit to the power module, and the second heat dissipation unit 902 is used to dissipate heat from the top of the power unit to the power module. As shown by the arrow in Figure 12, the first heat dissipation unit 901 and the second heat dissipation unit 902 can form a circulating air convection to achieve effective heat dissipation of the power module.

[0161] In one alternative embodiment, referring to FIG12, the second heat dissipation unit 902 includes a mounting plate 9021 and at least one second cooling fan 9022.

[0162] The air outlet of the second cooling fan 9022 is located on one side inside the frame 40 of the mounting plate 9021; the mounting plate 9021 is fixedly connected to the frame 40 and is located near the top of the power unit 10.

[0163] The mounting plate is used to secure the second cooling fan to the frame, ensuring its stable connection and stability within the power module.

[0164] At least one second cooling fan is mounted on the mounting plate, and the air outlet of the second cooling fan is located on the side of the mounting plate facing the inside of the frame to ensure that air flows directly to the top of the power unit, forming effective air convection and ensuring heat dissipation.

[0165] Optionally, the mounting plate is provided with at least one through hole, and the second cooling fan is mounted on the mounting plate through the corresponding through hole.

[0166] Based on this, the second cooling fan can be securely mounted on the mounting plate, and then securely mounted on the frame. Since the mounting plate has a through hole for mounting the second cooling fan, airflow can be improved, thereby improving the heat dissipation effect.

[0167] It should be understood that the number of second cooling fans can be set according to the space of the installation location and the heat dissipation requirements, and the embodiments of this application do not impose any special limitations on this.

[0168] Optionally, the second heat dissipation unit includes multiple second heat dissipation fans, with the air outlet of each second heat dissipation fan facing upwards towards the corresponding power unit.

[0169] Based on this, the exhaust port of each second cooling fan is designed to face directly upwards towards the power unit, ensuring that cool air can effectively cover each power device to form effective air convection and improve heat dissipation efficiency.

[0170] Furthermore, multiple secondary cooling fans operate simultaneously, providing a larger volume of cool airflow, which can quickly remove the heat generated by the power unit.

[0171] In one example, referring to Figure 8, the power module further includes a control unit; the control unit is mounted on the frame and electrically connected to multiple power units for controlling the switching states of the power units.

[0172] The control unit adjusts the switching state of the power unit based on the voltage, current and other signals in the energy storage converter, and calculates and sends control signals through the control algorithm. This controls the output voltage and current on the AC side of the energy storage converter. Therefore, the power module can be debugged using the control unit, which greatly shortens the R&D cycle of the energy storage converter.

[0173] In some examples, when multiple power units include three-phase power control units, the control unit is used to control the three-phase power control units in the multiple power units to be turned on or off synchronously in order to avoid current imbalance or harmonic distortion caused by phase difference, and to reasonably distribute the load to ensure the balance of current in each phase and reduce the impact of unbalanced load on the system.

[0174] It should be understood that when multiple power units also include power control units with other functions, the control unit can control the on or off state of the power control units with other functions according to specific needs. This application does not make specific limitations in this regard.

[0175] The control unit is connected to the power unit via wires or a circuit board to ensure the stability and reliability of signal transmission.

[0176] Optionally, the control unit includes a housing and a control component and / or a data acquisition component disposed within the housing; wherein the housing is disposed on a frame; the data acquisition component is electrically connected to the control component and is used to transmit acquired external DC signals or external AC signals to the control component; the control component is electrically connected to multiple power units and is used to control the switching state of the power modules according to the external DC signals or external AC signals transmitted by the data acquisition component.

[0177] For example, the acquisition components may include a DC acquisition component and an AC acquisition component. The DC acquisition component is used to acquire DC signals (voltage signals and / or current signals) on the DC side of the power converter, and the AC acquisition component is used to acquire DC signals (voltage signals and / or current signals) on the AC side of the power converter.

[0178] It should be understood that the aforementioned housing is used to house and protect the control components from external environmental influences. The housing is mounted on the frame to ensure the stability and easy access of the control components.

[0179] In one example, the sampling control unit is positioned according to the location of the power unit. Therefore, the housing can be located near the bottom of the frame and near multiple power units to reduce the length of the connection lines between the power units and enable the control components to make electrical connections and transmit data with the power units more directly and quickly. This reduces the signal transmission path and thus reduces signal delay and interference.

[0180] Optionally, the housing is positioned on the frame at the mounting side of multiple power units, and the housing and frame are rotatably connected. The mounting side of the power units can be understood as the side where the power units are installed or replaced.

[0181] Based on this, when the power unit needs maintenance or replacement, the sampling control unit can be rotated so that the power unit can slide out to achieve maintenance and replacement of the power unit. Afterwards, the sampling control unit can be rotated back to the installation position and connected to the wire connection structure with bolts to achieve electrical connection and fixation.

[0182] The above configuration reduces the need to disassemble other components, thereby simplifying the maintenance process of the power unit.

[0183] Specifically, the rotatable connection between the shell and the frame can be achieved in the following ways:

[0184] Optionally, the housing includes a first rotatable member, and the frame includes a second rotatable member; the housing is rotatably connected to the frame via the first and second rotatable members.

[0185] Based on this, the shell can be rotated or tilted relative to the frame.

[0186] For example, the first rotatable component is a hinge, and the second rotatable component is a fixed shaft. The hinge and the fixed shaft work together to allow the housing to rotate or tilt relative to the frame.

[0187] For example, the first rotatable component is a rotary bearing, and the second rotatable component is a fixed shaft. The rotary bearing and the fixed shaft work together to allow the housing to rotate or tilt relative to the frame.

[0188] In one example, to achieve electromagnetic shielding, the housing may include a metal housing.

[0189] It should be understood that a metal casing can effectively block external electromagnetic interference (EMI) and prevent electromagnetic radiation generated by internal electronic components from affecting the external environment. Therefore, using a metal casing can prevent the electromagnetic radiation generated by the sampling control unit from affecting the power module.

[0190] In one example, the power module also includes connecting wires;

[0191] The housing has through holes through which the connecting wires connect to the control components and multiple power units.

[0192] The through-hole should be sized to accommodate all necessary connecting wires while minimizing its impact on the structural strength of the housing. The location of the through-hole should facilitate the arrangement of connecting wires. Furthermore, to prevent electromagnetic interference and environmental factors (such as dust and moisture), the through-hole may be equipped with a shielding sleeve or a sealing gasket.

[0193] Optionally, referring to Figure 8, the power module also includes a copper busbar 80 for connecting the power unit 10 to an external device.

[0194] It should be understood that copper busbars, as conductive components, have low resistance and high conductivity, making them suitable for high-current transmission. Furthermore, the rigid structure of copper busbars improves the mechanical stability of the connection between the power unit 10 and external devices, reducing loosening of connections due to vibration or impact. Moreover, the high thermal conductivity of copper busbars aids in heat dissipation, reducing heat buildup caused by current transmission.

[0195] For example, copper busbar 80 is used to connect power unit 10 to other devices or modules in the external cabinet of the energy storage converter. This external cabinet integrates DC and AC outputs, and the copper busbar can be used to connect power unit 10 to both the DC and AC outputs.

[0196] Optionally, referring to Figure 8, the power module also includes a wiring harness interface unit 70, which is fixedly connected to the frame and used to collect the connection cables between the power module and the external cabinet.

[0197] The wire harness interface unit 70 can support the collection of various types of wire harnesses, including power cables, signal cables, and control cables. By centrally managing the connecting cables, the wire harness interface unit 70 ensures the stability and reliability of the cable connections and reduces cable clutter.

[0198] The wire harness interface unit is fixedly connected to the frame 40 and can remain stable during operation and transportation.

[0199] In one example, the harness interface unit 70 is located adjacent to the output side of the power module.

[0200] It should be understood that the output side of the power module is the electrical connection side between the power module and the external device. Based on this, not only can the overall integration of the power module be increased, but the wiring complexity between the power module and the external device is also simplified, providing a stable and reliable connection between the power module and the external device, and reducing signal loss and interference in power transmission.

[0201] Optionally, referring to FIG8, the power module further includes a precharge discharge unit 60, which is electrically connected to a plurality of capacitor units 20 and detachably connected to the frame 40.

[0202] The precharge and discharge unit 60 precharges the capacitor unit 20 before the energy storage converter starts up and safely discharges the residual charge in the capacitor unit 20 after the energy storage converter stops, so as to protect the components in the energy storage converter from damage by surge voltage.

[0203] The precharge and discharge unit is connected to multiple capacitor units to ensure effective control of the capacitor units during the charging and discharging process.

[0204] In some examples, the precharge discharge unit 60 may be positioned adjacent to the capacitor unit 20 to reduce the length of the electrical connection path between the two, thereby reducing parasitic resistance and inductance and improving the electrical performance and efficiency of the power module.

[0205] Optionally, to increase the overall integration of the power module, the precharge discharge unit 60 can be placed in an unused position of the frame.

[0206] In one alternative embodiment, the precharge discharge unit includes an isolation plate and a precharge discharge assembly, the precharge discharge assembly being detachably connected to the frame via the isolation plate.

[0207] This isolation plate is used to achieve electrical isolation between the precharge and discharge components and other units or frames in the power module, preventing electrical interference between the precharge and discharge components and other units or frames, thereby improving the safety and stability of the energy storage converter. The overall structure and principle of the power module in this embodiment are described in detail below:

[0208] As can be seen from the above description, this embodiment combines easily damaged electrical components to form an independent power module. The power module includes multiple independent units, all of which are designed to be detachable, facilitating overall replacement or individual module replacement or maintenance, reducing downtime and improving maintenance efficiency.

[0209] In this embodiment, the capacitor units and power units are arranged in an alternating combination design. The capacitor units and power units can be installed vertically via a frame support structure, facilitating operation and achieving high integration. The capacitor units are spaced apart to avoid stacking, and air cooling ensures stable operation and efficient heat dissipation. The power units are inserted into the gaps between the capacitor modules via a guide sliding structure, making full use of these gaps for installation, resulting in a compact structure and increased power density. Furthermore, the power module integrates the data acquisition and control components of the energy storage converter, significantly shortening the development cycle.

[0210] Specifically, referring to Figure 12, the capacitor unit 20 is fixed on the frame 40 by the first support frame, and the capacitor units 20 are kept at a reasonable distance to ensure that the power unit 10 can be installed.

[0211] In this embodiment, the overall heat dissipation of the power module consists of two parts. Compared with air cooling alone, the power unit 10 also uses a liquid cooling plate for efficient heat dissipation, which can remove the high heat generated by the power unit 10 when outputting high power, thus ensuring the reliability of the power device.

[0212] Compared to relying solely on liquid cooling, this power module includes two heat dissipation units. The first heat dissipation unit 901 blows air towards the bottom of the capacitor unit 20, while the second heat dissipation unit 902 blows air towards the top of the power unit 10. The two heat dissipation units can form an air circulation, effectively dissipating heat. Furthermore, considering the maintenance needs in case of fan failure, the first heat dissipation unit 901 can be slidably connected to the capacitor unit, facilitating overall maintenance.

[0213] Specifically, this embodiment employs a combined liquid cooling plate and air cooling heat dissipation method, without a compressor. Before startup, the power module and ambient temperature are the same, with no condensation. During startup, the power unit 10 heats up rapidly, the liquid cooling plate absorbs heat and heats up, and the capacitor unit 20 heats up. Although there is a temperature difference within the module, the overall temperature of the power module is higher than the ambient air temperature, and the temperature does not fall below the dew point, so no condensation occurs. During normal operation, the power unit 10 temperature is high, the liquid cooling plate absorbs heat and heats up, and the capacitor unit 20 heats up. The overall temperature of the power module is higher than the ambient air temperature, and no condensation occurs. In high humidity environments, during normal operation, the power unit 10 temperature is high, the liquid cooling plate absorbs heat and heats up, and the capacitor unit 20 heats up. The overall temperature of the power module is higher than the ambient temperature, and the temperature does not fall below the dew point, so no condensation occurs. In low temperature environments, during normal operation, the power unit 10 temperature is high, the liquid cooling plate absorbs heat and heats up, and the capacitor unit 20 heats up. The power module is higher than the ambient air temperature, and the temperature does not fall below the dew point, so no condensation occurs. To prevent leakage from the liquid cooling plate, PVC baffles are installed at the liquid outlet and inlet of the power module's liquid cooling plate to prevent the liquid cooling plate interface from bursting open due to pressure or other reasons, causing damage to power devices, short circuits, and other hazards.

[0214] Referring to Figure 8, the frame 40 can be constructed using sheet metal, connected by welding or bolts to ensure overall structural strength. The acquisition and control components in the control unit 50 are encapsulated within a housing, sealed as much as possible to ensure electromagnetic shielding. The housing is hinged to the frame 40, allowing rotation around the frame 40. When the power unit 10 needs to be disassembled or replaced, it does not affect its retraction. The pre-charge / discharge module 60 is fixed to an epoxy resin board and bolted to the frame 40, enabling smooth startup and output of the entire device. The power unit includes IGBT devices, current sharing buses, liquid cooling plates, etc., enabling AC / DC conversion and output. It can form a sliding rail with the overall frame 40 for convenient disassembly and installation. The capacitor unit 20 is vertically mounted on the frame 40 using a fixed support frame to prevent overcharging and reduce peak voltage. The conductive connection structure 30 reduces stray inductance. It is bolted above the capacitor unit 20 and connected to the power unit 10, resulting in a compact structure, short busbar length, and low overall stray inductance resistance. The wire harness interface module 70 is used to install and fix the wire harness terminals. The copper busbar 80 is used to transmit current.

[0215] Figure 13 is a comparison of the power volume energy density of the power module in this embodiment and the power module in the prior art. Compared with the power module in the prior art, this embodiment adopts an alternating arrangement of multiple power units and multiple bus capacitors to achieve a higher power density, which is increased to 0.00579w / mm3. The power density performance of this power module is improved by 177% compared with the power module in the prior art.

[0216] The power converter system (PCS) in the energy storage system is used to connect the power generation equipment and the energy storage device. The power generation equipment generates electrical energy, which can be stored in the energy storage device through the power converter system. For example, the power generation equipment can be a solar panel, hydroelectric power generation equipment, thermal power generation equipment, wind power generation equipment, etc. This application does not limit the specific type of power generation equipment.

[0217] During operation, the electronic components inside electrical cabinets such as PCS generate a lot of heat. If the heat cannot be dissipated in time, it will affect the working performance of the electrical cabinet and may even lead to safety accidents in severe cases.

[0218] However, the improved heat dissipation capacity of the PCS electrical cabinet reduces its protective capabilities, making it unable to effectively protect the electronic components inside the cabinet.

[0219] To address the aforementioned issues, as shown in Figures 14-24, this application provides an electrical cabinet and energy storage system that can both meet the protection requirements of the electrical cabinet and improve its heat dissipation capacity.

[0220] As shown in Figures 18 and 20, the electrical cabinet provided in this embodiment includes: a cabinet 1, which forms an outer circulation compartment 11 and an inner circulation compartment 12. The inner circulation compartment 12 is a closed compartment, while the outer circulation compartment 11 is connected to the outside. The protection level of the inner circulation compartment 12 is higher than that of the outer circulation compartment 11. The inner circulation compartment 12 is used to place a second electronic device 9 with a higher protection level requirement, while the outer circulation compartment 11 is used to place a first electronic device with a lower protection level requirement than the second electronic device 9.

[0221] The first electronic device can be a reactor 8 or a transformer, etc., and the second electronic device 9 can be a power module 91, a DC disconnect switch 92, an AC circuit breaker 93, a secondary circuit assembly, and an AC / DC switch assembly, etc.

[0222] As shown in Figures 18 and 19, the external circulation chamber 11 is provided with a first ventilation port 111 and a second ventilation port 112 that communicate with the outside. The external circulation chamber 11 is also provided with a first electronic device, a first fan 2 and a first surface cooler 3. The first fan 2 is used to drive air to enter the external circulation chamber 11 from the first ventilation port 111 and flow through the first surface cooler 3 and out from the second ventilation port 112.

[0223] One of the first ventilation opening 111 and the second ventilation opening 112 is an air inlet, and the other of the first ventilation opening 111 and the second ventilation opening 112 is an air outlet. The first ventilation opening 111 and the second ventilation opening 112 form a convection.

[0224] The first fan 2 can drive outside air into the external circulation chamber 11 from the first vent 111 and out from the second vent 112. The first vent 111 is the air inlet and the second vent 112 is the air outlet.

[0225] The first surface cooler 3 can be placed in the first vent 111, or it can be placed in the second vent 112, or it can be placed in the ventilation duct formed by the first vent 111 and the second vent 112. In all these cases, the air flowing into the external circulation chamber 11 from the outside passes through the first surface cooler 3 and flows out through the second vent 112 to cool the gas entering the external circulation chamber 11. This can reduce the temperature inside the external circulation chamber 11, thereby dissipating heat from the first electronic device, while simultaneously expelling the high-temperature air from the second vent 112.

[0226] In this embodiment, the external circulation chamber 11 is provided with a first fan 2 and a first surface cooler 3. The first fan 2 can drive outside air to flow through the first surface cooler 3 to blow the low-temperature gas on the surface of the first surface cooler 3 to the first electronic device, thereby realizing heat dissipation of the first electronic device through air cooling.

[0227] In some embodiments, as shown in FIG20, the first electronic device, the first surface cooler 3 and the first vent 111 are arranged sequentially along the height direction of the electrical cabinet. The first surface cooler 3 is disposed at the first vent 111, and the air inlet side of the first fan 2 faces the first surface cooler 3 so as to draw in outside air from the first vent 111 and enter the external circulation chamber 11 through the first surface cooler 3. The first surface cooler 3 can cool the air flowing through it.

[0228] In this embodiment, the first electronic device is arranged horizontally on one side of the second vent 112 to increase the airflow over the surface of the first electronic device and improve the heat dissipation effect of the first electronic device.

[0229] In some embodiments, as shown in FIG20, the air inlet side of the first fan 2 faces the first electronic device to accelerate the airflow on the surface of the first electronic device and improve the heat dissipation effect of the first electronic device.

[0230] In some embodiments, as shown in FIG20, the second vent 112 is higher than the first vent 111 along the height direction of the electrical cabinet, and the first electronic device is disposed on one side of the second vent 112. The air inlet side of the first fan 2 faces the first electronic device, so that the outside air entering from the first vent 111 first passes through the first surface cooler 3 into the external circulation chamber 11, then passes through the surface of the first electronic device by the guiding action of the first fan 2, and finally is discharged from the second vent 112, thereby achieving the effect of heat dissipation for the first electronic device.

[0231] In some embodiments, both the first vent 111 and the second vent 112 may be equipped with dustproof and insectproof nets to reduce the risk of debris entering the external circulation chamber 11.

[0232] As shown in Figures 19 and 20, the inner circulation chamber 12 may be equipped with a second electronic device 9, a second fan 4, a liquid-cooled radiator 5, and a second surface cooler 6.

[0233] The second electronic device 9 has high protection requirements and is installed in the inner circulation chamber 12 with a high protection level.

[0234] The second fan 4 is used to drive the air in the inner circulation chamber 12 to flow through the second surface cooler 6, so as to accelerate the air flow rate on the surface of the second surface cooler 6 and accelerate the cooling of the air in the inner circulation chamber 12. The second surface cooler 6 is used to cool the air in the inner circulation chamber 12.

[0235] At least some of the second electronic components 9 have the lowest temperature resistance and higher heat dissipation requirements. The liquid cooling radiator 5 is used to dissipate heat for at least some of the second electronic components 9 with the lowest temperature resistance. The second electronic components 9 can achieve dual heat dissipation through liquid cooling radiator 5 and second fan 4, thereby increasing the heat dissipation effect and improving the stability of the electrical cabinet operation.

[0236] The liquid-cooled heat sink 5 is used to dissipate heat for at least part of the second electronic device 9. The liquid-cooled heat sink 5 can be a heat dissipation device such as a liquid cooling plate or a liquid cooling pipe.

[0237] The liquid-cooled heat sink 5 can be disposed on the side of at least part of the second electronic device 9, and the specific location can be determined according to the placement of the part of the second electronic device 9 with the lowest temperature resistance.

[0238] The number of liquid-cooled heat sinks 5 can be determined based on the number and volume of the second electronic device 9 with the lowest temperature resistance. For example, multiple liquid-cooled heat sinks 5 can be included, and multiple liquid-cooled heat sinks 5 can be inserted between the second electronic device 9 with the lowest temperature resistance.

[0239] Multiple liquid-cooled heat sinks 5 can be connected in parallel to the first surface cooler 3, so that the low-temperature refrigerant in the first surface cooler 3 can enter the multiple liquid-cooled heat sinks 5, thereby improving the heat dissipation effect of the second electronic device 9, which has the lowest temperature resistance.

[0240] For the second electronic device 9, which has high protection requirements but low heat dissipation requirements, it can be directly installed in the inner circulation chamber 12. The temperature of the inner circulation chamber 12 can be reduced by the second surface cooler 6, thereby providing air cooling for the second electronic device 9, which has low temperature resistance.

[0241] As shown in Figure 19, the second surface cooler 6 and the liquid-cooled radiator 5 are each connected to the first surface cooler 3 through heat exchange pipes 7.

[0242] The liquid-cooled radiator 5 and the second surface cooler 6 are connected in parallel. The outlet of the first surface cooler 3 is connected to the inlet of the liquid-cooled radiator 5 and the inlet of the second surface cooler 6, respectively, so as to transport the low-temperature refrigerant in the first surface cooler 3 to the liquid-cooled radiator 5 and the second surface cooler. The outlet of the liquid-cooled radiator 5 and the outlet of the second surface cooler 6 are connected to the inlet of the first surface cooler 3, respectively, so as to return the high-temperature refrigerant in the liquid-cooled radiator 5 and the second surface cooler 6 to the first surface cooler 3.

[0243] In this embodiment, the low-temperature refrigerant in the first surface cooler 3 can flow into the second surface cooler 6 and the liquid cooling radiator 5, thereby achieving liquid cooling and air cooling for the second electronic device 9 with the highest heat dissipation requirements, and air cooling for the second electronic device 9 with general heat dissipation requirements.

[0244] The second surface cooler 6 and the liquid-cooled radiator 5 are each connected to the first surface cooler 3 through a heat exchange pipe 7. The extension direction of the heat exchange pipe 7 can be determined according to the arrangement of the second surface cooler 6, the liquid-cooled radiator 5 and the first surface cooler 3.

[0245] The outside of the heat exchange pipe 7 can be wrapped with heat insulation material to reduce the temperature loss of the heat exchange pipe 7, reduce the thermal interference between the inlet and outlet pipes of the heat exchange pipe 7, and reduce the thermal interference of the heat exchange pipe to the compartment.

[0246] According to the electrical cabinet provided in this application, the cabinet 1 is divided into an inner circulation chamber 12 that is connected to the outside and a sealed outer circulation chamber 11. The outer circulation chamber 11 is equipped with a first fan 2 and a first surface cooler 3. The first fan 2 can drive outside air to flow through the first surface cooler 3 to blow the low-temperature gas on the surface of the first surface cooler 3 to the first electronic device, thereby achieving heat dissipation of the first electronic device through air cooling. The outer circulation chamber 11 is equipped with a second fan 4, a liquid cooling radiator 5 and a second surface cooler 6. The low-temperature refrigerant in the first surface cooler 3 can flow into the second surface cooler 6 and the liquid cooling radiator 5, thereby achieving liquid cooling and air cooling for the second electronic device 9 with the lowest temperature resistance, and air cooling for the second electronic device 9 with a relatively low temperature resistance. The sealed inner circulation chamber 12 meets the high protection requirements of the second electronic device 9 and can also effectively dissipate heat from it.

[0247] In some embodiments, as shown in FIG20, the second vent 112 is provided on the wall of the external circulation chamber 11 away from the second part 122, and the second surface cooler 6 is provided on the wall of the second part 122 away from the external circulation chamber 11.

[0248] The second vent 112 and the second surface cooler 6 are arranged opposite each other on the front and rear walls of the cabinet 1 along the front-rear direction of the electrical cabinet. Alternatively, the second vent 112 and the second surface cooler 6 can be arranged opposite each other on the left and right walls of the cabinet 1 along the left-right direction of the electrical cabinet. That is, the second vent 112 and the second surface cooler 6 are spaced far apart on the electrical cabinet, which can reduce the thermal interference of the high-temperature gas discharged from the second vent 112 on the second surface cooler 6 and improve the heat dissipation effect of the inner circulation chamber 12.

[0249] In some embodiments, as shown in FIG20, the second vent 112 is disposed on the rear wall of the electrical cabinet in the front-back direction, and the second surface cooler 6 is disposed on the front wall of the electrical cabinet in the front-back direction. Since the gas discharged from the second vent 112 has a high temperature, disposing of the second vent 112 on the rear wall of the electrical cabinet can reduce the risk of hot air blowing directly on the human body and improve the safety of the electrical cabinet. At the same time, the second surface cooler 6 can be opened and closed with the front door, which is convenient for operation.

[0250] In some embodiments, as shown in Figures 14 and 15, the cabinet 1 further includes a base 14, which is disposed at the bottom of the cabinet 1 along the height direction of the electrical cabinet and can provide stable support for the cabinet 1.

[0251] The base 14 has air inlets 141 on multiple sides. The first ventilation port 111 is located on the top wall of the base 14. The first ventilation port 111 is connected to the air inlets 141 on multiple sides. The air inlets 141 are used to introduce outside air. By introducing air from multiple sides, the air volume entering the external circulation chamber 11 can be increased, thereby increasing the amount of gas passing through the first surface cooler 3 and improving the heat dissipation effect of the external circulation chamber 11.

[0252] In some embodiments, as shown in Figures 17 and 20, the inner circulation chamber 12 includes a first part 121 and a second part 122 connected together. The first part 121 is higher than the second part 122 and the outer circulation chamber 11 in the height direction. The liquid cooling radiator 5 is disposed in the first part 121, and the second fan 4 and the second surface cooler 6 are disposed in the second part 122.

[0253] The part with the highest heat dissipation requirements, the second electronic device 9, is located in the first part 121 and can be cooled by liquid cooling and air cooling through the liquid cooling heat sink 5. The part with the general heat dissipation requirements, the second electronic device 9, is located in the second part 122 and can be cooled by air cooling through the second fan 4 and the second surface cooler 6.

[0254] In this embodiment, by setting the inner circulation compartment 12 as a first part 121 and a second part 122, the spatial layout inside the cabinet 1 is optimized, the compactness of the cabinet 1 is improved, and the wiring connection of the first electronic device and the second electronic device 9 is facilitated, reducing the difficulty of wiring; at the same time, the second electronic device 9, which generates the most heat, can be placed separately from other parts of the second electronic device 9 for separate heat dissipation, thereby reducing mutual thermal interference, improving the working stability of the second electronic device 9, and improving the working reliability of the electrical cabinet.

[0255] The second part 122 and the external circulation chamber 11 are arranged side by side in the horizontal direction, which can shorten the length of the heat exchange pipeline 7 between the first surface cooler 3 and the second surface cooler 6, as well as the heat exchange pipeline 7 between the first surface cooler 3 and the liquid cooling radiator 5, reduce the heat loss of the heat exchange pipeline 7, and improve the structural compactness of the electrical cabinet.

[0256] In some embodiments, as shown in FIG20, the second electronic device 9 includes a power module 91, a DC disconnect switch 92, and an AC circuit breaker 93. The power module 91 is disposed in the first part 121, and the liquid cooling heat sink 5 is used to dissipate heat from the power module 91. The DC disconnect switch 92 and the AC circuit breaker 93 are disposed in the second part 122.

[0257] Among them, the power module 91 has the lowest heat resistance and the largest heat generation during operation. The liquid cooler 5 is used to cool the power module 91 by liquid cooling, while the second surface cooler 6 and the second fan 4 can cool the power module 91 by air cooling, which can improve the heat dissipation effect of the power module 91 and improve the stability of the power module 91 under high load operation.

[0258] The power module 91 is positioned above the DC disconnect switch 92 and the AC circuit breaker 93 along the height of the electrical cabinet. This facilitates wiring between the power module 91, the DC disconnect switch 92, and the AC circuit breaker 93, reduces thermal interference, improves the operational stability of the three components, and enhances the operational reliability of the electrical cabinet.

[0259] In some embodiments, as shown in FIG21, the DC disconnect switch 92 and the AC circuit breaker 93 are arranged side by side along the height direction of the electrical cabinet, and the DC disconnect switch 92 and the AC circuit breaker 93 are located on one side of the second surface cooler 6. On the one hand, the cold air on the surface of the second surface cooler 6 can directly reach the DC disconnect switch 92 and the AC circuit breaker 93 to dissipate heat from them. On the other hand, the second fan 4 can drive the cold air on the surface of the second surface cooler 6 to reach the DC disconnect switch 92 and the AC circuit breaker 93, thereby increasing the heat dissipation effect on the DC disconnect switch 92 and the AC circuit breaker 93.

[0260] The second surface cooler 6 can be installed on the side along the height of the electrical cabinet. The second fan 4 is installed below the second surface cooler 6 or near the bottom of the second surface cooler 6 along the height of the electrical cabinet. The air outlet side of the second fan 4 faces the opposite side of the side where the second surface cooler 6 is located. Thus, the second fan 4 can drive the cold air on the surface of the second surface cooler 6 to flow along the extension direction of the side wall of the inner circulation chamber 12. This allows the low-temperature gas to enter the first part 121 after passing through the DC disconnect switch 92 and AC circuit breaker 93 in the second part 122, and then return to the surface of the second surface cooler 6 for cooling after passing through the liquid cooling radiator 5 in sequence.

[0261] In some embodiments, as shown in FIG21, the input port of the DC disconnect switch 92 is disposed at the bottom of the inner circulation chamber 12 along the height direction. The base 14 may be provided with a DC connection port, and the connecting wire can be connected to the DC input port of the DC disconnect switch 92 from the DC connection port of the base 14, thereby shortening the length of the connecting wire, and the base 14 can protect the connecting wire.

[0262] The output port of the DC disconnect switch 92 faces the power module 91 along the height direction, which facilitates the electrical connection between the power module 91 and the output port of the DC disconnect switch 92.

[0263] DC power is input to the upper power module 91 through the output port of DC disconnect switch 92. The power module 91 converts DC to AC, which shortens the length of the connection line, reduces the difficulty of wiring, and facilitates maintenance.

[0264] In some embodiments, as shown in Figures 18 and 21, the output port of the AC circuit breaker 93 is located on the side wall of the inner circulation compartment 12, and the AC wiring port can be located on the side of the cabinet 1 to facilitate wiring and installation by the operator. The direction of the copper busbar can be selected, and the assembly is flexible.

[0265] The input port of the AC circuit breaker 93 is positioned above the output port of the AC circuit breaker 93 along the height direction of the electrical cabinet; the first electronic device includes a reactor 8, the input port of the reactor 8 faces the first part 121, and the output port of the reactor 8 faces the second part 122.

[0266] DC power is input to the upper part through DC isolation switch 92, and DC to AC is completed by power module 91. It is then transmitted down to reactor 8, passes through the first cavity, enters the outer circulation chamber 11, passes through reactor 8 and capacitor in the outer circulation chamber 11, passes through the second cavity, returns to AC circuit breaker 93 in inner circulation chamber 12, and finally reaches the bottom to achieve AC output.

[0267] In some embodiments, as shown in Figures 16 and 18, the cabinet 1 further includes a top cover 15, the top cover 15, the spacer 13 and the cabinet body 17 together form an inner circulation compartment 12, as shown in Figure 14, the end of the top cover 15 in the left-right direction is lower than the middle of the top cover 15.

[0268] In this embodiment, the top cover 15 is designed with slopes on both sides, which facilitates the smooth drainage of rainwater, reduces water accumulation on the top cover 15, and improves the safety and reliability of the electrical cabinet; and the slopes are located in the left and right directions of the top cover 15, which can reduce the drainage of water from the front of the cabinet 1.

[0269] In some embodiments, the cabinet 1 further includes a cabinet body 17, with a top cover 15 covering the top of the cabinet body 17. The top cover 15 can be opened and closed relative to the top of the cabinet body 17 to facilitate the installation of electronic devices in the inner circulation compartment 12.

[0270] In some embodiments, the cabinet 1 further includes a support member, one end of which is used to connect to the top cover 15, and the other end of which is used to connect to the cabinet body 17.

[0271] When the operator opens the cover, the two ends of the support are connected to the top cover 15 and the cabinet 17 respectively, which can support the top cover 15 so that the top cover 15 is kept open relative to the cabinet 17, reducing the shaking of the top cover 15 in the open state and facilitating manual operation.

[0272] The support component can be a pneumatic rod.

[0273] In some embodiments, the top cover 15 and the cabinet 17 may be a sealed connection.

[0274] A sealing groove is provided on one of the bottom surface of the top cover 15 and the top surface of the cabinet 17. A protrusion that matches the sealing groove is provided on one of the bottom surface of the top cover 15 and the top surface of the cabinet 17. The sealing groove and the protrusion can form a labyrinth seal, thereby increasing the protection level of the cabinet 1.

[0275] In some embodiments, as shown in Figures 16 and 18, the cabinet 1 includes a cabinet body 17, a spacer 13, and a door 16. The spacer 13 is disposed inside the cabinet body 17 and is used to separate the inner circulation compartment 12 and the outer circulation compartment 11. The door 16 is disposed in the cabinet body 17 and can be opened and closed, and the spacer 13 is disposed opposite to the door 16.

[0276] Cabinet 17, spacer 13 and door 16 together form inner circulation compartment 12; cabinet 17 and spacer 13 together form outer circulation compartment 11.

[0277] The door 16 can be located on the front side of the cabinet 17, and the second ventilation opening 112 is located on the rear side of the cabinet 17, making it convenient for operators to open the door 16 to work on the internal circulation chamber 12.

[0278] The electrical cabinet also includes an electrical connector 94, which can be a copper busbar connector and is used for electrical connection.

[0279] The electrical connector 94 includes a first connector 941 and a second connector 942 for electrical connection. The first connector 941 is disposed in the inner circulation compartment 12 and installed on the side of the spacer 13 facing the door 16. The second connector 942 is disposed in the second electronic device 9. When the first connector 941 and the second connector 942 are in the assembled state, the projections of the first connector 941 and the second connector 942 along the arrangement direction of the door 16 and the spacer 13 at least partially overlap.

[0280] In this embodiment, the operator can pre-install the first connector 941 on one side of the spacer 13 located in the inner circulation compartment 12. The first connector 941 is positioned opposite the door 16 and can be fixed to the spacer 13 by insulating posts. The second connector 942 is pre-installed on the second electronic device 9. The operator can open the door 16 and insert the second electronic device 9 and the second connector 942 into the cabinet 17 from the front, aligning them with the first connector 941 through the front space. Bolts are installed in the overlapping area of ​​the first connector 941 and the second connector 942 to connect them. This operation is convenient, and the disassembly and assembly of the electronic device are not affected by the fixed copper busbars on the panel. Combined with the modular design, individual assembly is possible, making operation flexible.

[0281] The various embodiments of this disclosure have been described above. These descriptions are exemplary and not exhaustive, and are not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or technical improvements to the embodiments in the market, or to enable others skilled in the art to understand the embodiments disclosed herein. The scope of this disclosure is defined by the appended claims.

Claims

1. An energy storage system, characterized in that, It includes an energy storage converter and an electrical cabinet, wherein the energy storage converter is located inside the electrical cabinet; The energy storage converter includes a power module; The power module includes: Multiple power units (10) and multiple capacitor units (20) are arranged alternately along a first direction.

2. The energy storage system according to claim 1, characterized in that, The power module also includes: A conductive connection structure (30) is provided, wherein the plurality of power units (10) and the plurality of capacitor units (20) are disposed on the same side of the conductive connection structure (30) and are all electrically connected to the conductive connection structure (30).

3. The energy storage system according to claim 2, characterized in that, The conductive connection structure (30) is disposed above the plurality of power units (10) and the plurality of capacitor units (20).

4. The energy storage system according to claim 2, characterized in that, The conductive connection structure (30) includes: A conductive plate (301) and a plurality of conductive connecting bars (302) are arranged at intervals along a first direction on the side of the conductive plate (301) facing the power unit (10). The conductive plate (301) is electrically connected to the plurality of conductive connecting bars (302) and the plurality of capacitor units (20), respectively. The plurality of conductive connecting bars (302) are also electrically connected to the plurality of power units (10) one by one.

5. The energy storage system according to claim 4, characterized in that, The power unit (10) includes: Multiple power devices, the conductive connection bar (302) includes multiple conductive connection terminals (3021), and each of the multiple conductive connection terminals (3021) of the conductive connection bar (302) is electrically connected to the multiple power devices of the corresponding power unit (10) one by one.

6. The energy storage system according to claim 5, characterized in that, Each of the plurality of conductive terminals (3021) of each conductive connection bar (302) has the same structure so that the current flowing through the plurality of conductive terminals (3021) of each conductive connection bar (302) is the same.

7. The energy storage system according to any one of claims 1-6, characterized in that, The power units (10) are arranged in parallel, and / or the number of capacitor units (20) is the same between every two power units (10).

8. The energy storage system according to any one of claims 2-6, characterized in that, The power module also includes: Frame (40); the conductive connection structure (30) is covered on the frame (40).

9. The energy storage system according to claim 8, characterized in that, The plurality of capacitor units (20) are detachably connected to the side of the frame (40) near the conductive connection structure (30) and disposed within the frame (40).

10. The energy storage system according to claim 9, characterized in that, The capacitor unit (20) includes a first support frame (201) and at least one capacitor element (202); The at least one capacitor element (202) is disposed in the first support frame (201), the first support frame (201) is detachably connected to the side of the frame (40) near the conductive connection structure (30), and the at least one capacitor element (202) is electrically connected to the conductive connection structure (30).

11. The energy storage system according to claim 10, characterized in that, The power module also includes: Multiple first heat dissipation units (901) are provided, and the first heat dissipation units (901) are correspondingly arranged with the capacitor unit (20); The first heat dissipation unit (901) is disposed on one side of the first support frame (201) of the corresponding capacitor unit (20) and is used to dissipate heat from the corresponding capacitor unit (20).

12. The energy storage system according to claim 11, characterized in that, The first heat dissipation unit (901) is disposed on the bottom of the first support frame (201) on the side opposite to the capacitor (202).

13. The energy storage system according to claim 12, characterized in that, The first heat dissipation unit (901) is detachably connected to the bottom of the first support frame (201) on the side opposite to the capacitor (202).

14. The energy storage system according to claim 12, characterized in that, The first heat dissipation unit (901) includes: The second support frame (9011) and the first cooling fan (9012) are disposed in the second support frame (9011) and the air outlet direction is towards the capacitor (202).

15. The energy storage system according to claim 14, characterized in that, The first support frame (201) has a first mounting part at its bottom and the second support frame (9011) has a second mounting part at its top. The second support frame (9011) is mounted on the bottom of the first support frame (201) through the second mounting part and the first mounting part.

16. The energy storage system according to claim 15, characterized in that, The second mounting part is slidably disposed on the first mounting part.

17. The energy storage system according to any one of claims 8-16, characterized in that, The plurality of power units (10) are detachably mounted on the side of the frame (40) away from the conductive connection structure (30) and disposed within the frame (40).

18. The energy storage system according to claim 17, characterized in that, The plurality of power units (10) are detachably mounted along a second direction on the side of the frame (40) away from the conductive connection structure (30); wherein the second direction is perpendicular to the first direction.

19. The energy storage system according to claim 17, characterized in that, The power unit (10) includes: A third support frame and at least one power device, wherein the at least one power device is disposed in the third support frame, the third support frame being detachably mounted on the side of the frame (40) away from the conductive connection structure (30), and the at least one power device being electrically connected to the conductive connection structure (30) from the side of the frame (40) near the conductive connection structure (30).

20. The energy storage system according to claim 19, characterized in that, The bottom of the third support frame has a third mounting part, and the side of the frame (40) away from the conductive connection structure (30) has a fourth mounting part. The third support frame is detachably mounted on the side of the frame (40) away from the conductive connection structure (30) through the third mounting part and the fourth mounting part.

21. The energy storage system according to claim 20, characterized in that, The third mounting part is slidably disposed on the fourth mounting part.

22. The energy storage system according to claim 19, characterized in that, The power unit (10) further includes a heat exchanger, which is disposed in the third support frame corresponding to the power unit (10) and is used to exchange heat with at least one power device in the third support frame.

23. The energy storage system according to claim 22, characterized in that, The heat exchanger is a liquid cooling plate, and the power unit (10) further includes a first baffle and / or a second baffle. The first baffle is disposed at the liquid inlet of the liquid cooling plate, and / or the second baffle is disposed at the liquid outlet of the liquid cooling plate.

24. The energy storage system according to any one of claims 1-23, characterized in that, The power module further includes a frame (40) and a control unit (50), the control unit (50) being disposed on the frame (40) and electrically connected to the plurality of power units (10) for controlling the switching state of the power module.

25. The energy storage system according to claim 24, characterized in that, The control unit (50) includes: The housing is detachably mounted on the frame (40), and a control component is provided inside the housing. The control component is electrically connected to the plurality of power units (10) and is used to control the switching state of the power units (10).

26. The energy storage system according to claim 25, characterized in that, The control unit also includes a data acquisition component disposed within the housing. The data acquisition component is electrically connected to the control component and is used to transmit acquired external DC signals or external AC signals to the control component.

27. The energy storage system according to claim 25, characterized in that, The housing is located near the bottom of the frame (40) and near the plurality of power units (10).

28. The energy storage system according to claim 27, characterized in that, Along the extending direction of the power unit (10), the housing is disposed on the mounting side of the plurality of power units (10), and the housing is rotatably connected to the frame (40).

29. The energy storage system according to claim 28, characterized in that, The housing includes a first rotatable member, and the frame (40) includes a second rotatable member; The housing is rotatably connected to the frame (40) via the first rotatable member and the second rotatable member.

30. The energy storage system according to claim 25, characterized in that, The housing includes a metal housing.

31. The energy storage system according to claim 17, characterized in that, The power module also includes a second heat dissipation unit (902); The second heat dissipation unit (902) is fixedly connected to the frame (40), and the air outlet of the second heat dissipation unit (902) faces upwards of the power unit (10).

32. The energy storage system according to claim 31, characterized in that, The second heat dissipation unit (902) includes a mounting plate (9021) and at least one second cooling fan (9022); The air outlet of the second cooling fan (9022) is located on the side of the mounting plate (9021) facing the inside of the frame (40); The mounting plate (9021) is fixedly connected to the frame (40) and is disposed above the power unit (10).

33. The energy storage system according to claim 32, characterized in that, The mounting plate (9021) is provided with at least one through hole corresponding to the at least one second cooling fan (9022), and the second cooling fan (9022) is mounted on the mounting plate (9021) through the through hole.

34. The energy storage system according to claim 33, characterized in that, The second heat dissipation unit (902) includes a plurality of second heat dissipation fans (9022), and the air outlet of each second heat dissipation fan (9022) faces upwards from the corresponding power unit (10).

35. The energy storage system according to claim 9, characterized in that, The power module also includes a wiring harness interface unit (70), which is fixedly connected to the frame (40) and is used to collect the connection wires between the power module and external devices.

36. The energy storage system according to claim 35, characterized in that, The harness interface unit (70) is located near the output side of the power module.

37. The energy storage system according to claim 9, characterized in that, The power module also includes a precharge discharge unit (60), which is electrically connected to the plurality of capacitor units (20) and detachably connected to the frame (40).

38. The energy storage system according to claim 37, characterized in that, The precharge discharge unit (60) includes an isolation plate and a precharge discharge assembly, which is detachably connected to the frame (40) through the isolation plate.

39. The energy storage system according to any one of claims 1-38, characterized in that, The power module also includes a copper busbar (80) for connecting the power unit (10) to an external device.

40. The energy storage system according to claim 39, characterized in that, The copper busbar (80) is located on the connection side between the power unit (10) and the external device.

41. The energy storage system according to claim 1, characterized in that, The electrical cabinet includes a cabinet, which forms an outer circulation compartment and an inner circulation compartment; The external circulation chamber is provided with a first ventilation opening and a second ventilation opening that communicate with the outside. The external circulation chamber is also provided with a first electronic device, a first fan and a first surface cooler. The first fan is used to drive air to enter the external circulation chamber from the first ventilation opening and flow through the first surface cooler and out from the second ventilation opening. The inner circulation chamber is equipped with a second electronic device, a second fan, a liquid-cooled radiator, and a second surface cooler. The second fan is used to drive the air in the inner circulation chamber to flow through the second surface cooler. The liquid-cooled radiator is used to dissipate heat for at least part of the second electronic device. The second surface cooler and the liquid-cooled radiator are each connected to the first surface cooler through heat exchange pipes.

42. The energy storage system according to claim 41, characterized in that, The cabinet also includes a base, and multiple sides of the base are provided with air inlets, with the first air inlet located on the top wall of the base.

43. The energy storage system according to claim 41, characterized in that, The inner circulation chamber includes a first part and a second part connected together. The first part is higher than the second part and the outer circulation chamber in the height direction. The second part and the outer circulation chamber are arranged side by side in the horizontal direction. The liquid cooling radiator is arranged in the first part, and the second fan and the second surface cooler are arranged in the second part.

44. The energy storage system according to claim 43, characterized in that, The second vent is located on the wall of the external circulation compartment away from the second part, and the second surface cooler is located on the wall of the second part away from the external circulation compartment.

45. The energy storage system according to claim 43, characterized in that, The second electronic device includes a power module, a DC disconnect switch, and an AC circuit breaker. The power module is located in the first part, and the liquid-cooled heat sink is used to dissipate heat from the power module. The DC disconnect switch and the AC circuit breaker are located in the second part.

46. ​​The energy storage system according to claim 45, characterized in that, The DC disconnect switch and the AC circuit breaker are arranged side by side along the height of the electrical cabinet and are located on one side of the second surface cooler.

47. The energy storage system according to claim 46, characterized in that, The input port of the DC disconnect switch is located at the bottom of the inner circulation compartment along the height direction, and the output port of the DC disconnect switch faces the power module along the height direction.

48. The energy storage system according to claim 46, characterized in that, The output port of the AC circuit breaker is located on the side wall of the inner circulation compartment, and the input port of the AC circuit breaker is located above the output port of the AC circuit breaker along the height direction of the electrical cabinet. The first electronic device includes a reactor, with the input port of the reactor facing the first portion and the output port of the reactor facing the second portion.

49. The energy storage system according to any one of claims 41-48, characterized in that, Along the height of the electrical cabinet, the first electronic device, the first surface cooler, and the first vent are arranged in sequence, and the first electronic device is arranged horizontally on one side of the second vent.

50. The energy storage system according to any one of claims 41-48, characterized in that, The cabinet includes a cabinet body, a partition, and a door. The partition is disposed inside the cabinet body and is used to separate the inner circulation compartment and the outer circulation compartment. The door is openable and closable and is disposed opposite to the cabinet body. The electrical cabinet also includes electrical connectors, which include a first connector and a second connector for electrical connection. The first connector is disposed in the inner circulation compartment and installed on the side of the spacer facing the door. The second connector is disposed in the second electronic device. When the first connector and the second connector are in the assembled state, the projections of the first connector and the second connector along the arrangement direction of the door and the spacer at least partially overlap.

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