High energy density liquid-cooled industrial energy storage cabinet

Abstract

This application provides a high-energy-density liquid-cooled commercial and industrial energy storage cabinet, comprising: an upper compartment; a battery pack disposed within the upper compartment; a lower compartment located below the upper compartment; and an AC / DC integrated energy storage converter disposed within the lower compartment and connected to the battery pack. The AC / DC integrated energy storage converter includes a high-voltage control circuit and an energy storage converter, which are integrated into one unit. The energy storage cabinet of this application features a compact structural design, which reduces the volume of commercial and industrial energy storage cabinets, increases overall energy density, and reduces cabinet costs and on-site construction costs.

Description

Technical Field

[0001] This application relates to the fields of new energy, energy storage, and power systems, and specifically to a high-energy-density liquid-cooled commercial and industrial energy storage cabinet. Background Technology

[0002] Currently, commercial and industrial energy storage cabinets generally adopt a design that independently integrates the DC high-voltage control box and the energy storage converter (PCS). This technological limitation results in commercial and industrial energy storage cabinets being relatively bulky and having relatively low energy density. To accommodate all the internal equipment, the design of the energy storage cabinet must include multiple compartments, which not only increases costs but also makes installation and maintenance more complex. Summary of the Invention

[0003] In view of one of the deficiencies in the prior art, the purpose of this application is to provide a high energy density liquid-cooled industrial and commercial energy storage cabinet.

[0004] The first aspect of this application provides a high-energy-density liquid-cooled commercial and industrial energy storage cabinet, comprising:

[0005] Upper cabin;

[0006] The battery pack is located in the upper compartment.

[0007] The lower compartment is located below the upper compartment;

[0008] An AC / DC integrated energy storage converter is installed in the lower compartment and connected to the battery pack. The AC / DC integrated energy storage converter includes a high-voltage control circuit and an energy storage converter, which are integrated into one unit.

[0009] Optionally, the high-voltage control circuit includes a DC side section, a converter section, and an AC side section, wherein:

[0010] The DC side portion includes:

[0011] The series circuit consists of a DC fuse, a DC contact circuit, a DC EMC filter, and a bus capacitor connected in series on a DC line. The DC contact circuit consists of a first DC contactor and a second DC contactor connected in parallel. The DC fuse and the first DC contactor are connected in series.

[0012] DC surge protection circuit, connected in parallel at both ends of the DC line input;

[0013] A pre-charging circuit is connected in parallel to both ends of the series connection between the DC fuse and the first DC contactor;

[0014] The converter section includes a converter circuit, which is connected to the bus capacitor.

[0015] The communication side portion includes:

[0016] The AC side series circuit consists of an AC filter, an AC relay, and an AC EMC filter connected in series on the AC line in sequence.

[0017] An AC surge protection circuit is connected in parallel at both ends of the AC line output and connected to the AC power grid.

[0018] Optionally, the DC side portion of the high-voltage control circuit is connected to the DC input port of the energy storage converter through the DC fuse, the first DC contactor, and the second DC contactor, and the AC side portion is connected to the AC output port of the energy storage converter through the AC filter and the AC relay.

[0019] Optionally, the DC side of the battery pack is directly connected to the AC / DC integrated energy storage converter.

[0020] Optionally, it also includes a DC high-voltage connector for connecting the DC side of the battery pack to the AC / DC integrated energy storage converter.

[0021] Optionally, the upper compartment may also include one or more of the following features:

[0022] - Firefighting equipment, installed on the top of the upper compartment;

[0023] - Lighting, installed on the top of the upper compartment;

[0024] - A DC cable connects the battery pack and the AC / DC integrated energy storage converter.

[0025] Optionally, it also includes:

[0026] The liquid-cooled unit is located in the lower compartment, below the AC / DC integrated energy storage converter;

[0027] Liquid cooling piping extends from the lower compartment into the upper compartment, connecting the liquid cooling unit and the battery pack.

[0028] Optionally, it also includes a cabinet door, which is movably connected to the upper compartment and the lower compartment, which are distributed vertically.

[0029] The cabinet door is equipped with a lock to lock it to the upper compartment and the lower compartment.

[0030] Optionally, one or more of the following features are installed on the cabinet door:

[0031] - The battery management department monitors the status of the entire energy storage cabinet in real time;

[0032] - Status indicator lights, connected to the battery management unit, display different colors to indicate different states;

[0033] - Emergency stop button, connected to the battery management unit, controls the energy storage cabinet to stop;

[0034] - The power distribution unit is connected to the AC / DC integrated energy storage converter, the battery management unit, or the liquid cooling unit to provide power and electrical protection;

[0035] - The heat dissipation duct has a hollow structure and is aligned with the lower compartment.

[0036] Optionally, it may also include one or more of the following features:

[0037] - Lifting rings, installed on the top of the upper compartment;

[0038] - The front skid plate is installed at the bottom of the lower compartment.

[0039] The industrial and commercial energy storage cabinet provided in this application adopts the technical means of AC / DC integrated energy storage converter, which brings about the technical effect of reducing the size of the industrial and commercial energy storage cabinet and increasing the overall energy density.

[0040] Other technical effects resulting from the additional features will be further illustrated in the corresponding embodiments. Attached Figure Description

[0041] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0042] Figure 1 This is a front view of an industrial or commercial energy storage cabinet according to an exemplary embodiment;

[0043] Figure 2 This is a layout diagram of an industrial or commercial energy storage cabinet according to an exemplary embodiment;

[0044] Figure 3 This is a rear view of an industrial or commercial energy storage cabinet according to an exemplary embodiment.

[0045] Figure 4 The left view of an industrial or commercial energy storage cabinet according to an exemplary embodiment;

[0046] Figure 5 This is a structural diagram of a high-voltage control circuit according to an exemplary embodiment;

[0047] Figure 6 This is a circuit connection diagram illustrating an industrial or commercial energy storage cabinet application according to an exemplary embodiment.

[0048] In the diagram, 1-upper compartment, 2-battery pack, 3-lower compartment, 4-AC / DC integrated energy storage converter, 5-fire protection components, 6-liquid cooling unit, 7-liquid cooling pipeline, 8-cabinet door, 9-door lock, 10-status indicator light, 11-emergency stop button, 12-battery management section, 13-power distribution section, 14-heat dissipation duct, 15-lifting ring, 16-front guard plate, 17-warning label; 41-DC fuse, 42-first DC contactor, 43-second DC contactor, 44-DC surge protection circuit, 45-DC EMC filter, 46-bus capacitor, 47-converter circuit, 48-AC filter, 49-AC relay, 410-AC EMC filter, 411-AC surge protection circuit, 412-pre-charging circuit. Detailed Implementation

[0049] The present application will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present application, but do not limit the present application in any way. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present application, and these all fall within the protection scope of the present application. Parts not described in detail in the following embodiments can be implemented using existing technology.

[0050] Commercial and industrial energy storage cabinets generally employ a design that independently integrates the DC high-voltage control box and the energy storage converter (PCS). This technological limitation results in commercial and industrial energy storage cabinets being relatively bulky and having relatively low energy density. To address these issues, this application provides a high-energy-density liquid-cooled commercial and industrial energy storage cabinet.

[0051] Reference Figure 1 and Figure 2 As shown, a high-energy-density liquid-cooled industrial and commercial energy storage cabinet includes an upper compartment 1, a battery pack 2, a lower compartment 3, and an AC / DC integrated energy storage converter 4. The battery pack 2 is disposed in the upper compartment 1; the lower compartment 3 is located below the upper compartment; the AC / DC integrated energy storage converter 4 is disposed in the lower compartment 3 and connected to the battery pack 2.

[0052] The embodiments described above in this application employ an AC / DC integrated energy storage converter, which reduces the volume of industrial and commercial energy storage cabinets (by up to 30%) and increases the overall energy density.

[0053] To achieve space saving, in some specific embodiments of this application, the AC / DC integrated energy storage converter 4 is an energy storage converter with an internally integrated DC high-voltage control circuit, that is, the high-voltage control circuit is integrated inside the energy storage converter, such as... Figure 2 As shown, the high-voltage control circuit and the energy storage converter are integrated. Specifically, as... Figure 5As shown, the high-voltage control circuit includes a DC fuse 41, a first DC contactor 42, a second DC contactor 43, a DC surge protection circuit 44, a DC EMC filter 45, a bus capacitor 46, a converter circuit 47, an AC filter 48, an AC relay 49, an AC EMC filter 410, an AC surge protection circuit 411, and a pre-charging circuit 412, and is divided into a DC side section, a converter section, and an AC side section.

[0054] DC Side Section: DC fuse 41 is used to quickly disconnect the circuit and protect downstream equipment in the event of a short circuit or other fault on the DC side. It is connected in series in the DC input line. First DC contactor 42 and second DC contactor 43 are used to control the on / off state of the DC circuit. Generally, during system startup, shutdown, or fault occurrence, the connection and disconnection of the DC circuit are achieved by controlling these two contactors. They are connected in series with the DC fuse and in parallel with the pre-charging circuit. DC surge protection circuit 44 prevents damage to equipment from lightning overvoltage on the DC side and is connected in parallel across the DC input line. DC EMC filter 45 is used to suppress electromagnetic interference on the DC side and ensure the purity of the DC power supply. It is connected in series in the DC line after the DC contactors. Bus capacitor 46 stabilizes the DC bus voltage and stores energy. It is connected in series with the DC EMC filter and is located before the converter circuit.

[0055] Converter section: Converter circuit 47 converts DC power into AC power and is connected to bus capacitor 46 and AC filter 48.

[0056] AC side section: AC filter 48 filters out harmonic components in the AC power output from the converter circuit, making the output AC power closer to a sine wave. It is connected to converter circuit 47 and AC relay 49. AC relay 49 controls the switching on and off of the AC circuit and is connected to AC filter 48 and AC EMC filter 410. AC EMC filter 410 suppresses electromagnetic interference on the AC side and is connected in series in the AC output line, after AC relay 49. AC surge protection circuit 411 prevents the AC side from suffering lightning overvoltage. It is connected in parallel across the AC output line and then connected to the AC power grid (U, V, W phases), with PE as protective ground.

[0057] The DC side of the aforementioned high-voltage control circuit is connected to the DC input port of the energy storage converter via DC fuses, contactors, etc., providing DC power input to the energy storage converter or receiving DC power output from the energy storage converter. The AC side is connected to the AC output port of the energy storage converter via AC filters, relays, etc. After the energy storage converter converts the DC power into AC power, it is fed into the AC power grid through the AC side circuit.

[0058] The above high-voltage control circuit is only a preferred embodiment of the AC / DC integrated energy storage converter 4 of this application. In other embodiments, the high-voltage control circuit of the AC / DC integrated energy storage converter 4 can also adopt other technologies and is not limited to the above embodiment. Alternatively, other products with AC / DC integrated energy storage converter functions can also be used. The above-mentioned pre-charging circuit, lightning protection circuit, converter circuit, etc., can all be selected from existing circuits.

[0059] The above-described embodiments of this application employ an energy storage converter with an internally integrated DC high-voltage control circuit, eliminating the need for a separate DC high-voltage control box. This significantly reduces the size of the industrial and commercial energy storage cabinet and lowers cabinet costs as well as on-site construction costs.

[0060] To facilitate operation and improve assembly efficiency, in some specific embodiments of this application, the DC side of the battery pack 2 is directly connected to the AC / DC integrated energy storage converter 4.

[0061] For example, a DC high-voltage connector can be used to directly connect the DC side of battery pack 2 to the AC / DC integrated energy storage converter.

[0062] In the embodiments described above, the DC side of the battery pack is directly connected to the integrated AC / DC energy storage converter, which facilitates operation and installation and improves assembly efficiency. Furthermore, direct connection of the battery pack's DC side reduces the number of power lines, wiring harness costs, and cable losses, thereby improving the charging and discharging efficiency of the energy storage cabinet. This also reduces the number of assembly steps for the energy storage cabinet, simplifying assembly, reducing errors during assembly, and improving production efficiency.

[0063] To enhance the functionality of the energy storage cabinet, some specific embodiments of this application, such as Figure 2 As shown, the upper compartment 1 also includes fire-fighting equipment 5, lighting fixtures, and DC cables.

[0064] Specifically, fire-fighting component 5 is installed on the top of the energy storage cabinet, inside the top of the upper compartment 1, to provide timely sprinkler fire suppression in the event of a fire. Lighting is also installed on the top of the energy storage cabinet to provide illumination for the entire cabinet. DC cables connect the battery pack 2 and the AC / DC integrated energy storage converter 4. Specifically, DC high-voltage connectors are installed on the DC cables, which connect the battery pack and the AC / DC integrated energy storage converter.

[0065] In order to ensure that the temperature of the energy storage cabinet is kept within the normal operating range, some specific embodiments of this application also include a liquid cooling unit 6 and a liquid cooling pipeline 7.

[0066] Specifically, the liquid cooling unit 6 is located in the lower compartment 3, below the AC / DC integrated energy storage converter 4; the liquid cooling pipeline 7 runs from the lower compartment 3 into the upper compartment 1, connecting the liquid cooling unit 6 and the battery pack 2.

[0067] For example: A liquid cooling pipe 7 extends from the liquid cooling unit 6 and enters the upper compartment 1, branching into a number of branches equal to the number of battery packs 2, and connecting to the corresponding battery packs 2.

[0068] In the above embodiments of this application, by setting up liquid cooling units and liquid cooling pipelines, the temperature of the battery pack during operation is ensured not to overheat, thus ensuring the continuous operation of the energy storage cabinet.

[0069] To ensure the airtightness and safety of the energy storage cabinet, some specific embodiments of this application also include a cabinet door 8, which is movably connected to the upper compartment 1 and the lower compartment 3 distributed vertically; the cabinet door 8 is equipped with a door lock 9 to lock it to the upper compartment 1 and the lower compartment 3.

[0070] In the above embodiments of this application, a cabinet door is installed to ensure the sealing and safety of the entire energy storage cabinet.

[0071] To ensure operational safety, in some specific embodiments of this application, the cabinet door 8 is also equipped with a status indicator light 10, an emergency stop button 11, a battery management unit 12, a power distribution unit 13, and a heat dissipation duct 14 from top to bottom.

[0072] Specifically, the battery management unit 12 is connected to the battery pack 2 to monitor its status in real time. It can also perform intelligent scheduling and data analysis to achieve efficient utilization of the energy storage cabinet's charging and discharging and stable system operation.

[0073] Status indicator light 10 has three colors: green, yellow, and red. The color changes according to the status of the battery pack in the battery management section. Green indicates power, illuminating when the energy storage cabinet is powered on; yellow indicates operation, illuminating when the energy storage cabinet starts running; and red indicates a fault, illuminating when the energy storage cabinet malfunctions and shuts down.

[0074] The emergency stop button 11 is connected to the battery management unit 12. If an emergency occurs based on the monitored status, the emergency stop button can be pressed to shut down the energy storage cabinet.

[0075] The power distribution section 13 consists of surge protectors, miniature circuit breakers, meters, and cables, providing power and electrical protection for the equipment inside the energy storage cabinet. The equipment inside the cabinet includes a liquid-cooled chiller, an EMS (Electric Power Management System), and an AC / DC integrated energy storage converter (PCS). The surge protectors are connected to the AC bus for lightning protection. The miniature circuit breakers are connected to the AC bus on one side and to the electrical equipment inside the cabinet on the other. The meters are also connected to the AC bus.

[0076] The heat dissipation duct 14 has a hollow structure, facing the lower compartment 3, to ventilate and dissipate heat for the liquid-cooled unit and the PCS cooling fan. A similar heat dissipation duct can also be installed opposite the cabinet door of the lower compartment.

[0077] In this application, by configuring status indicator lights, emergency stop buttons, and battery management systems, the status of the energy storage cabinet is clearly presented to the staff, and the safety of the operation process is guaranteed.

[0078] For ease of transportation, some specific embodiments of this application, such as Figure 1 , Figure 3 and Figure 4 As shown, a lifting ring 15 and a front guard plate 16 are also provided.

[0079] Specifically, lifting rings are installed on top of the energy storage cabinet for easy crane lifting. The front guard plate 16 is a baffle for the forklift holes in the base of the lower compartment 3; after removal, the energy storage cabinet can be moved by forklift. The front guard plate 16 ensures that the base of the lower compartment 3 is not clogged by garbage, dust, or other debris, ensuring efficient forklift handling.

[0080] In some other specific implementations, warning labels 17 are also affixed to the cabinet doors to prevent accidental contact by non-professionals.

[0081] To ensure the diversity of energy storage cabinet specifications, in some specific embodiments of this application, the battery pack specifications can be any one of 215kWh, 232kWh, 240kWh, or 261kWh.

[0082] In this application, the industrial and commercial energy storage cabinet can be adapted to a variety of liquid-cooled battery packs, thereby realizing flexible configuration of the energy storage cabinet capacity.

[0083] In other embodiments of this application, such as Figure 6 As shown, the industrial and commercial energy storage cabinet can be connected in the following circuit configuration for practical applications: The power input is AC400V + N + PE, which is divided into multiple circuits after passing through circuit breaker QF0. One circuit connects to a 125kW AC / DC integrated energy storage converter, which is connected to a 261kWh battery pack to achieve AC / DC conversion and battery charging and discharging control. Another circuit connects to a surge protector (SPD) via circuit breaker QFS for overvoltage protection. A third circuit connects to a liquid cooling unit via circuit breaker QF1 for heat dissipation of the battery pack and other equipment. A fourth circuit connects to the high-voltage box power supply via circuit breaker QF2. A fifth circuit connects to a 24V switching power supply via circuit breaker QF3, which then supplies power to the fire protection components, EMS (Electronic Management System) power supply, HMI (Hybrid Management Interface), water immersion system, temperature and humidity sensors, and indicator lights. The remaining two circuits connect to sockets and lighting fixtures via circuit breakers QF4 and QF5 respectively, providing daily power.

[0084] The preferred features in the above embodiments can be used individually in any embodiment, or in any combination thereof, provided they do not conflict with each other. Furthermore, parts not described in detail in the embodiments can be implemented using existing technologies.

[0085] In the description of the embodiments of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0086] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature.

[0087] In the description of the embodiments in this application, "multiple" means two or more, unless otherwise explicitly specified. In this application, unless otherwise explicitly specified and limited, the terms "installed," "connected," "linked," "fixed," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0088] The terms "comprising" and "having," and any variations thereof, in the embodiments of this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the steps or units listed, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to such processes, methods, products, or devices.

[0089] The foregoing has described some specific embodiments of this application. It should be understood that this application is not limited to the specific embodiments described above, and those skilled in the art can make various modifications or variations within the scope of the claims, which do not affect the substantive content of this application. The above-described preferred features can be used in any combination without conflict.

Claims

1. A high-energy-density liquid-cooled commercial and industrial energy storage cabinet, characterized in that, include: Upper cabin; The battery pack is located in the upper compartment. The lower compartment is located below the upper compartment; An AC / DC integrated energy storage converter is installed in the lower compartment and connected to the battery pack. The AC / DC integrated energy storage converter includes a high-voltage control circuit and an energy storage converter, which are integrated into one unit.

2. The high energy density liquid-cooled commercial and industrial energy storage cabinet according to claim 1, characterized in that, The high-voltage control circuit includes a DC side section, a converter section, and an AC side section, wherein: The DC side portion includes: The series circuit consists of a DC fuse, a DC contact circuit, a DC EMC filter, and a bus capacitor connected in series on a DC line. The DC contact circuit consists of a first DC contactor and a second DC contactor connected in parallel. The DC fuse and the first DC contactor are connected in series. DC surge protection circuit, connected in parallel at both ends of the DC line input; A pre-charging circuit is connected in parallel to both ends of the series connection between the DC fuse and the first DC contactor; The converter section includes a converter circuit, which is connected to the bus capacitor. The communication side portion includes: The AC side series circuit consists of an AC filter, an AC relay, and an AC EMC filter connected in series on the AC line in sequence. An AC surge protection circuit is connected in parallel at both ends of the AC line output and connected to the AC power grid.

3. A high-energy-density liquid-cooled commercial and industrial energy storage cabinet according to claim 2, characterized in that, The DC side of the high-voltage control circuit is connected to the DC input port of the energy storage converter through the DC fuse, the first DC contactor, and the second DC contactor, while the AC side is connected to the AC output port of the energy storage converter through the AC filter and the AC relay.

4. The high energy density liquid-cooled commercial and industrial energy storage cabinet according to claim 1, characterized in that, The DC side of the battery pack is directly connected to the AC / DC integrated energy storage converter.

5. A high-energy-density liquid-cooled commercial and industrial energy storage cabinet according to claim 4, characterized in that, It also includes a DC high-voltage connector that connects the DC side of the battery pack to the AC / DC integrated energy storage converter.

6. A high-energy-density liquid-cooled commercial and industrial energy storage cabinet according to claim 1, characterized in that, The upper cabin also includes one or more of the following features: - Firefighting equipment, installed on the top of the upper compartment; - Lighting, installed on the top of the upper compartment; - A DC cable connects the battery pack and the AC / DC integrated energy storage converter.

7. A high-energy-density liquid-cooled commercial and industrial energy storage cabinet according to claim 1, characterized in that, Also includes: The liquid-cooled unit is located in the lower compartment, below the AC / DC integrated energy storage converter; Liquid cooling piping extends from the lower compartment into the upper compartment, connecting the liquid cooling unit and the battery pack.

8. A high-energy-density liquid-cooled commercial and industrial energy storage cabinet according to claim 7, characterized in that, It also includes cabinet doors, which are movably connected to the upper and lower compartments distributed vertically. The cabinet door is equipped with a lock to lock it to the upper compartment and the lower compartment.

9. A high-energy-density liquid-cooled commercial and industrial energy storage cabinet according to claim 8, characterized in that, The cabinet door is equipped with one or more of the following features: - The battery management unit connects to the battery pack and monitors the status of the entire energy storage cabinet in real time; - Status indicator lights, connected to the battery management unit, display different colors to indicate different states; - Emergency stop button, connected to the battery management unit, controls the energy storage cabinet to stop; - The power distribution unit is connected to the AC / DC integrated energy storage converter, the battery management unit, or the liquid cooling unit to provide power and electrical protection; - The heat dissipation duct has a hollow structure and is aligned with the lower compartment.

10. A high-energy-density liquid-cooled commercial and industrial energy storage cabinet according to claim 1, characterized in that, It also includes one or more of the following features: - Lifting rings, installed on the top of the upper compartment; - The front skid plate is installed at the bottom of the lower compartment.

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