Mesh construction type cabinet type energy storage equipment

Abstract

The invention provides net-forming type cabinet type energy storage equipment, and belongs to the technical field of cabinet type energy storage equipment.The net-forming type cabinet type energy storage equipment comprises a liquid cooling cabin, an electrical cabin and a battery cabin which are sequentially arranged from top to bottom in the height direction of a cabinet body, and the liquid cooling cabin provides cooling liquid for a battery pack set and an energy storage converter; the liquid cooling pipeline provides cooling liquid for each battery pack of the battery cabin through the second primary inlet pipe, so that the consistency of heat taken away by battery cells of each battery pack is good, the temperature difference between the battery cells is reduced, the temperature consistency of the battery cells is improved, and the operation efficiency of the whole machine is further improved; the liquid cooling pipeline provides cooling liquid for the energy storage converter through the first primary inlet pipe, so that cooling water inlet paths of the battery packs and the energy storage converter are mutually independent, the cooling liquid supply temperatures of the energy storage converter and the battery packs can be conveniently and independently set, and heat management is carried out on the battery packs and the energy storage converter; and the temperature control precision of the electrical cabin and the battery cabin can be improved.

Description

Technical Field

[0001] The present application belongs to the technical field of cabinet-type energy storage equipment, and specifically relates to a network-type cabinet-type energy storage equipment. Background Art

[0002] At present, the electrical compartment and battery compartment of cabinet-type energy storage equipment generally use air cooling to dissipate heat. The temperature of the electrical compartment and battery compartment is controlled within a normal range through forced air convection. However, this heat dissipation method makes it difficult to blow cold air evenly to all parts of the battery compartment, resulting in a large temperature difference between the battery cells in the entire cabinet. In the long run, this will affect the consistency of the battery cells, produce a barrel effect, and lead to low operating efficiency of the entire machine. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art or related art.

[0004] In view of this, according to an embodiment of the present application, a grid-type cabinet-type energy storage device is proposed, including:

[0005] Cabinet;

[0006] A liquid-cooled engine room, in which a liquid cooler is arranged;

[0007] The electrical compartment is arranged below the liquid-cooled engine compartment and contains an energy storage converter;

[0008] A battery compartment is arranged below the electrical compartment. A battery pack group is arranged in the battery compartment along the height direction of the cabinet. The battery pack group includes a plurality of battery packs.

[0009] The liquid cooling pipeline includes a first-level inlet pipe and a second-level inlet pipe, wherein the first end of the first-level inlet pipe is connected to the output end of the liquid cooler, and the second end of the first-level inlet pipe is connected to the liquid inlet of the energy storage inverter; the second-level inlet pipe is arranged along the height direction of the cabinet, wherein the first end of the second-level inlet pipe is connected to the output end of the liquid cooler, and the second end of the second-level inlet pipe is connected to the liquid inlet of the battery pack.

[0010] In a feasible embodiment, the second-level inlet pipe includes a main liquid inlet pipe and several secondary inlet pipes. The main liquid inlet pipe is arranged along the height direction of the cabinet. The first end of the secondary inlet pipe is connected to the main liquid inlet pipe, and the second end of the secondary inlet pipe is connected to the liquid inlet of the battery pack. The secondary inlet pipes correspond to the battery packs one by one, so that the coolant enters the corresponding battery packs in parallel through the secondary inlet pipes.

[0011] In a feasible implementation, the liquid cooling pipeline further includes a first-level return pipe and a second-level return pipe, wherein the first end of the first-level return pipe is connected to the liquid outlet of the energy storage converter, and the second end of the first-level return pipe is connected to the input end of the liquid cooler; the second-level return pipe is arranged along the height direction of the cabinet, the first end of the first-level return pipe is connected to the liquid outlet of the battery pack, and the second end of the first-level return pipe is connected to the input end of the liquid cooler;

[0012] The second first-level return pipe includes a main return pipe and several secondary return pipes. The main return pipe is arranged along the height direction of the cabinet. The first end of the secondary return pipe is connected to the liquid outlet of the battery pack, and the second end of the secondary return pipe is connected to the main return pipe. The secondary return pipes correspond to the battery packs one by one, so that the coolant flows back to the main return pipe in parallel through the secondary return pipes.

[0013] In a feasible implementation manner, the liquid cooling cabin is arranged on the top of the cabinet.

[0014] In a feasible implementation manner, a heat dissipation port is provided on the rear side wall of the liquid cooler, and the network-type cabinet energy storage device further includes:

[0015] The silencer air duct is arranged on the outer wall of the rear side of the cabinet, the silencer air duct extends along the height direction of the cabinet, and the silencer air duct is connected with the liquid cooling cabin.

[0016] In a feasible implementation, the silencer air duct includes an air inlet and an air outlet. The air inlet is arranged on the side wall of the silencer air duct close to the cabinet, the air inlet is opposite to the heat dissipation port, and the air outlet is arranged at the bottom of the silencer air duct.

[0017] In a feasible implementation, a high-voltage control box and electrical control devices are also arranged in the electrical compartment, the battery pack is electrically connected to the high-voltage control box, the energy storage inverter is electrically connected to the high-voltage control box, and the energy storage inverter is connected to the power grid through the electrical control device.

[0018] In a feasible implementation, two adjacent battery packs are connected via a DC bus cable and a communication line. After the battery pack group is connected to the high-voltage control box via the DC bus cable and the communication line, it passes through the energy storage inverter, the electric meter and the mutual inductor in sequence, and is then connected to the power grid through the electrical control device.

[0019] In a feasible implementation manner, the grid-type cabinet-type energy storage device further includes:

[0020] A fire extinguishing agent tank body, which is arranged on the top of the cabinet body;

[0021] A spray pipe, a first end of which is connected to the output end of the fire extinguishing agent tank, and a second end of which extends from the rear side of the electrical compartment to the battery compartment.

[0022] In a feasible implementation manner, the grid-type cabinet-type energy storage device further includes:

[0023] A cabinet door, which is rotatably connected to the cabinet body;

[0024] An electric meter is installed on the cabinet door and is used to measure and record the flow of electric energy in the energy storage system;

[0025] Display screen: The display screen is arranged on the cabinet door and displays the information of the energy storage system.

[0026] Compared with the prior art, the grid-type cabinet-type energy storage device of the present application has the following beneficial effects:

[0027] The grid-type cabinet energy storage device provided in the embodiment of the present application includes a liquid-cooled cabin, an electrical cabin and a battery cabin arranged in sequence from top to bottom along the height direction of the cabinet body. The liquid cooler provides cooling liquid for the battery pack group and the energy storage inverter. The liquid cooling pipeline provides cooling liquid for each battery pack in the battery cabin through the second-level inlet pipe, so that the heat taken away by the battery cells of each battery pack is consistent, the temperature difference between each battery cell is reduced, the temperature consistency of the battery cell is improved, and the operation efficiency of the whole machine is improved; the liquid cooling pipeline provides cooling liquid for the energy storage inverter through the first-level inlet pipe, so that the cooling water inlet paths of the battery pack and the energy storage inverter are independent of each other, which is convenient for separately setting the cooling liquid supply temperature of the energy storage inverter and each battery pack, and performing thermal management on the battery pack and the energy storage inverter respectively, which is beneficial to improving the temperature control accuracy of the electrical cabin and the battery cabin. The liquid-cooled compartment, electrical compartment and battery compartment are arranged in the cabinet from top to bottom along the height direction of the cabinet. The energy storage inverter is arranged close to the liquid cooler so that the energy storage inverter can quickly exchange heat with the liquid cooler, thereby improving the cooling efficiency of the liquid cooler on the energy storage inverter. At the same time, the second-level inlet pipe can be arranged in the cabinet along the height direction of the cabinet, and the gravity of the coolant itself is used as part of the power for transporting the coolant to the battery pack, thereby improving the cooling efficiency of the liquid cooler on each battery pack, thereby improving the cooling efficiency and effect of the entire machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0029] Figure 1 A schematic structural diagram of a grid-type cabinet-type energy storage device from a first angle according to an embodiment of the present application;

[0030] Figure 2 A schematic structural diagram of a grid-type cabinet-type energy storage device from a second angle according to an embodiment of the present application;

[0031] Figure 3 A schematic structural diagram of a grid-type cabinet-type energy storage device from a third angle according to an embodiment of the present application;

[0032] Figure 4 A schematic structural diagram of a liquid cooler of a grid-type cabinet-type energy storage device according to an embodiment of the present application;

[0033] Figure 5 A schematic structural diagram of an energy storage converter of a grid-type cabinet-type energy storage device according to an embodiment of the present application;

[0034] Figure 6 A schematic structural diagram of a silencer air duct of a network-type cabinet-type energy storage device according to an embodiment of the present application;

[0035] in, Figures 1 to 6 The corresponding relationship between the reference numerals and component names in the figure is:

[0036] 11. Cabinet; 12. Liquid cooling cabin; 13. Electrical cabin; 14. Battery cabin; 15. Liquid cooling pipeline; 17. Silencer air duct; 18. Air inlet; 19. Air outlet; 20. DC bus cable; 21. Communication line; 22. Fire extinguisher tank; 23. Sprinkler pipe; 24. Cabinet door; 25. Electric meter; 26. Display screen;

[0037] 121. Liquid cooler; 131. Energy storage converter; 132. High-voltage control box; 133. Electrical control device; 141. Battery pack;

[0038] 151, first level inlet pipe; 152, second level inlet pipe; 153, first level return pipe; 154, second level return pipe;

[0039] 1521, main liquid inlet pipe; 1522, secondary liquid inlet pipe; 1541, main liquid return pipe; 1542, secondary return pipe. DETAILED DESCRIPTION

[0040] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0041] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0042] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0043] The preferred embodiments of the present application are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present application and are not used to limit the present application.

[0044] like Figures 1 to 5 As shown, according to the embodiment of the present application, a grid-type cabinet energy storage device is proposed, including: a cabinet 11, a liquid cooling cabin 12, an electrical cabin 13, a battery cabin 14 and a liquid cooling pipeline 15; a liquid cooling machine 121 is arranged in the liquid cooling cabin 12; the electrical cabin 13 is arranged below the liquid cooling cabin 12, and an energy storage converter 131 is arranged in the electrical cabin 13; the battery cabin 14 is arranged below the electrical cabin 13, and a battery pack group is arranged in the battery cabin 14 along the height direction of the cabinet 11, and the battery pack group includes a plurality of batteries. Battery pack 141; the cold pipeline includes a first-level inlet pipe 151 and a second-level inlet pipe 152, the first end of the first-level inlet pipe 151 is connected to the output end of the liquid cooler 121, and the second end of the first-level inlet pipe 151 is connected to the liquid inlet of the energy storage inverter 131; the second-level inlet pipe 152 is arranged along the height direction of the cabinet 11, the first end of the second-level inlet pipe 152 is connected to the output end of the liquid cooler 121, and the second end of the second-level inlet pipe 152 is connected to the liquid inlet of the battery pack 141.

[0045] The grid-type cabinet energy storage device provided in the embodiment of the present application includes a liquid cooling cabin 12, an electrical cabin 13 and a battery cabin 14 arranged in sequence from top to bottom along the height direction of the cabinet 11. The liquid cooling machine 121 provides cooling liquid for the battery pack group and the energy storage converter 131. The liquid cooling pipeline 15 provides cooling liquid for each battery pack 141 of the battery cabin 14 through the second primary inlet pipe 152, so that the battery cells of each battery pack 141 take away heat uniformly, reduce the temperature difference between each battery cell, and improve The temperature consistency of the battery cells is improved, thereby improving the operating efficiency of the entire machine; the liquid cooling pipeline 15 provides cooling liquid to the energy storage inverter 131 through the first-level inlet pipe 151, so that the cooling water inlet paths of the battery pack 141 and the energy storage inverter 131 are independent of each other, which is convenient for separately setting the cooling liquid supply temperature of the energy storage inverter 131 and each battery pack 141, and performing thermal management on the battery pack 141 and the energy storage inverter 131 respectively, which is beneficial to improving the temperature control accuracy of the electrical compartment 13 and the battery compartment 14. The liquid cooling compartment 12, the electrical compartment 13 and the battery compartment 14 are arranged in the cabinet 11 from top to bottom along the height direction of the cabinet 11. The energy storage inverter 131 is arranged close to the liquid cooler 121 so that the energy storage inverter 131 can quickly exchange heat with the liquid cooler 121, thereby improving the cooling efficiency of the liquid cooler 121 on the energy storage inverter 131. At the same time, the second-level inlet pipe 152 can be arranged in the cabinet 11 along the height direction of the cabinet 11, and the gravity of the coolant itself is used as part of the power for conveying the coolant to the battery pack 141, thereby improving the cooling efficiency of the liquid cooler 121 on each battery pack 141, thereby improving the cooling efficiency and effect of the entire machine.

[0046] It can be understood that the liquid cooling pipeline 15 supplies the energy storage inverter 131 all the way, and the heat of the energy storage inverter 131 can be taken away by the flow of coolant, so that the energy storage inverter 131 has a better improvement in power density and system efficiency, and has better adaptability in high altitude and high temperature areas; when the energy storage equipment works in a high altitude environment, the efficient liquid cooling heat dissipation method greatly reduces the temperature derating effect caused by altitude changes, and greatly ensures the safe and stable operation of the energy storage inverter 131 products and energy storage equipment.

[0047] Specifically, the liquid supply flow rate, liquid supply pressure, and liquid supply temperature of the liquid cooling pipeline 15 can be actually set within a range as required.

[0048] Furthermore, the energy storage device is connected to the grid by the energy storage converter 131 to form an energy storage system. The energy storage converter 131 adopts a grid-type energy storage converter 131. The energy storage system generates a constant AC voltage source by controlling the grid-type energy storage converter 131, controls the amplitude and phase of the output voltage of the grid-side energy storage converter 131 as a self-synchronous voltage source to be connected to the grid, simulates the operation mechanism of the synchronous machine, and controls the Pf droop characteristics of the simulated synchronous machine by the synchronous generator body model (VSG) to simulate the synchronous machine. The phase of the voltage source is adjusted according to the power change to achieve self-synchronization, maintain the constant potential phasor in the grid-type energy storage device, and actively support the grid by outputting high power, so that the energy storage device can be operated both on the grid and off the grid, improve the support capacity for the grid, and enable the energy storage device to have the ability to mobilize its own operation and adjust the output in real time without external power supply. The voltage output is maintained by adjusting the power output, forming a voltage source connected to the grid, and maintaining system stability. In addition, an independent grid is formed in a weak grid without a rigid voltage source.

[0049] like Figure 2 As shown, in a feasible embodiment, the second-level inlet pipe 152 includes a main liquid inlet pipe 1521 and a plurality of secondary inlet pipes 1522. The main liquid inlet pipe 1521 is arranged along the height direction of the cabinet 11. The first end of the secondary inlet pipe 1522 is connected to the main liquid inlet pipe 1521, and the second end of the secondary inlet pipe 1522 is connected to the liquid inlet of the battery pack 141. The secondary inlet pipes 1522 correspond to the battery packs 141 one by one, so that the coolant enters the corresponding battery packs 141 in parallel through the secondary inlet pipes 1522.

[0050] In this technical solution, the secondary liquid inlet pipe 1522 connects the corresponding battery pack 141 to the main liquid inlet pipe 1521. After the coolant passes through the main liquid inlet pipe 1521, it enters the liquid inlet ports of each battery pack 141 in parallel through the secondary liquid inlet pipe 1522. At the same time, all battery packs 141 in the battery pack group are liquid-cooled, thereby improving the cooling efficiency and effect of the battery pack 141 and improving the temperature uniformity of the battery pack group.

[0051] like Figures 1 to 3As shown, in a feasible implementation manner, the liquid cooling pipeline 15 further includes a first primary return pipe 153 and a second primary return pipe 154, the first end of the first primary return pipe 153 is connected to the liquid outlet of the energy storage converter 131, and the second end of the first primary return pipe 153 is connected to the input end of the liquid cooling machine 121; the second primary return pipe 154 is arranged along the height direction of the cabinet 11, the first end of the first secondary return pipe 1542 is connected to the liquid outlet of the battery pack 141, and the second end of the first secondary return pipe 1542 is connected to the liquid outlet of the battery pack 141. It is connected to the input end of the liquid cooler 121; the second first-level return pipe 154 includes a main return pipe 1541 and a plurality of secondary return pipes 1542, the main return pipe 1541 is arranged along the height direction of the cabinet 11, the first end of the secondary return pipe 1542 is connected to the liquid outlet of the battery pack 141, the second end of the secondary return pipe 1542 is connected to the main return pipe 1541, the secondary return pipe 1542 corresponds to the battery pack 141 one by one, so that the cooling liquid flows back to the main return pipe 1541 in parallel through the secondary return pipe 1542.

[0052] In this technical solution, the cooling liquid after heat exchange in the battery pack 141 flows back to the input end of the liquid cooler 121 through the second primary return pipe 154, and the cooling liquid after heat exchange in the energy storage converter 131 flows back to the input end of the liquid cooler 121 through the first primary return pipe 153, so that the cooling water return paths of the battery pack 141 and the energy storage converter 131 are also independent of each other. The independent cooling water return path cooperates with the independent cooling water inlet path to further improve the temperature control accuracy of the electrical compartment 13 and the battery compartment 14. The secondary return pipe 1542 connects the corresponding battery pack 141 with the main return pipe 1541. After the cooling liquid exchanges heat with the battery pack 141, it flows back to the main return pipe 1541 in parallel through the secondary return pipe 1542, thereby improving the uniformity of the cooling liquid return temperature of the battery pack group, which is conducive to improving the temperature control accuracy of the battery compartment 14.

[0053] like Figure 1 As shown, in a feasible implementation manner, the liquid cooling cabin 12 is arranged on the top of the cabinet 11 .

[0054] In this technical solution, the liquid cooling cabin 12 is arranged at the top of the cabinet 11 so that the liquid cooling machine 121 dissipates heat from the top of the cabinet 11. The liquid cooling cabin 12 and the battery cabin 14 are respectively arranged at both ends of the cabinet 11, so that the liquid cooling machine 121 dissipates heat at a position away from the battery cabin 14, thereby reducing the influence of the heat dissipated by the liquid cooling machine 121 on the accuracy of temperature control of the battery pack 141.

[0055] Furthermore, the coolant input and output of the liquid cooler 121 are arranged on the front of the liquid cooler 121, the liquid inlet and outlet of the battery pack 141 are arranged on the front of the battery pack 141, and the liquid inlet and outlet of the energy storage converter 131 are arranged on the front of the energy storage converter 131. As a preferred solution, at least one heat dissipation port is arranged on the back of the liquid cooler 121, so that the heat dissipation position of the liquid cooler 121 is far away from the liquid cooling pipeline 15, reducing the influence of the heat dissipation of the liquid cooler 121 on the temperature of the liquid cooling pipeline 15.

[0056] like Figure 1 , Figure 2 and Figure 6 As shown, in a feasible embodiment, a heat dissipation port is provided on the rear side wall of the liquid cooler 121, and the mesh-type cabinet energy storage device also includes: a silencer air duct 17; the silencer air duct 17 is provided on the outer wall of the rear side of the cabinet 11, and the silencer air duct 17 extends along the height direction of the cabinet 11, and the silencer air duct 17 is connected to the liquid cooling cabin 12.

[0057] In this technical solution, the silencer air duct 17 is arranged on the outer wall of the cabinet 11 along the height direction of the cabinet 11, and the silencer air duct 17 is connected to the liquid cooling cabin 12 so that the hot air in the liquid cooling cabin 12 can be directly discharged along the path of the silencer air duct 17, replacing the fan to circulate and exhaust air inside the cabinet 11, thereby reducing the noise effect and reducing the influence of the heat dissipation of the liquid cooler 121 on the temperature control of the electrical cabin 13 and the battery cabin 14.

[0058] In this technical solution, one branch of the liquid cooling pipeline 15 supplies the energy storage inverter 131 of the electrical compartment 13, and the other branch supplies the various battery packs 141 of the battery compartment 14. The heat of the battery packs 141 is taken away by the flow of coolant, thereby improving the consistency of the effect of the battery cells taking away heat and making the temperature of each battery pack 141 more uniform. At the same time, the battery compartment 14 no longer needs to be matched with an air-cooling structure, which can reduce air convection and the noise of the air-cooling structure. At the same time, it prevents dust and dirt in the air from adhering to the components during forced convection ventilation, thereby improving the working safety of the components.

[0059] It is understandable that when the battery compartment 14 in the energy storage device is cooled by air cooling, an air duct needs to be designed in the cabinet 11 to ensure that the cooling air is blown to each battery pack 141. The air duct occupies a large space and it is difficult to evenly blow the cooling air to the battery cells of each battery pack 141. The heat taken away by the air cooling mechanism depends on the temperature of the air outside the energy storage device. When the external air temperature is high, the cooling effect and uniformity of the battery cells cannot be guaranteed. The liquid cooling pipeline 15 is used to provide coolant to each battery pack 141, so that the cooling effect of the battery cells of each battery pack 141 is more balanced, which helps to improve the consistency of the battery cell performance, thereby improving the operating efficiency of the whole machine.

[0060] like Figure 6 As shown, in a feasible embodiment, the silencer air duct 17 includes an air inlet 18 and an air outlet 19. The air inlet 18 is arranged on the side wall of the silencer air duct 17 close to the cabinet 11. The air inlet 18 is opposite to the heat dissipation port. The air outlet 19 is arranged at the bottom of the silencer air duct 17.

[0061] In this technical solution, when the liquid cooler 121 dissipates heat, the heat enters the silencer air duct 17 from the air inlet 18 at the top of the cabinet 11, and is discharged from the air outlet 19 at the bottom of the silencer air duct 17. By optimizing the design of the silencer air duct 17, the liquid cooler 121 dissipates heat by means of front air intake, external exhaust of the cabinet 11, and air outlet at the bottom of the silencer air duct 17, thereby reducing the heat dissipation noise of the entire machine and achieving a silent heat dissipation effect.

[0062] In this technical solution, the only external heat dissipation structures of the entire energy storage device are the cooling fan built into the liquid cooler 121 and the air outlet on the cabinet 11. The heat dissipation outlet is connected to the air inlet 18 of the silencer air duct 17 through the air outlet on the cabinet 11, so that the heat emitted by the liquid cooler 121 is directly blown into the silencer air duct 17 through the built-in cooling fan, and does not stay and circulate inside the cabinet 11, thereby reducing the impact of the heat dissipation of the liquid cooler 121 on the internal temperature of the cabinet 11.

[0063] Furthermore, only one exhaust port 19 may be provided, or multiple exhaust ports 19 may be provided. The number of exhaust ports 19 is set according to the temperature of the working environment of the energy storage device to ensure that the hot air in the silencer air duct 17 can flow out from the exhaust port 19 in time.

[0064] Furthermore, a filter is provided on the air outlet 19 to prevent external dust and dirt from entering the cabinet 11 through the silencer air duct 17 , thereby ensuring a good working environment for the components inside the cabinet 11 .

[0065] like Figure 1 and Figure 3 As shown, in a feasible implementation manner, a high-voltage control box 132 and an electrical control device 133 are also arranged in the electrical compartment 13, the battery pack is electrically connected to the high-voltage control box 132, the energy storage inverter 131 is electrically connected to the high-voltage control box 132, and the energy storage inverter 131 is connected to the power grid through the electrical control device 133.

[0066] In this technical solution, the battery pack is connected to a high-voltage control box 132, and then to an energy storage inverter 131 after passing through the high-voltage control box 132. The output of the energy storage inverter 131 is connected to the power grid after passing through an electrical control device 133. The state of the battery pack is monitored and controlled by the high-voltage control box 132. The energy storage inverter 131 converts the DC power of the battery pack into AC power compatible with the power grid or converts AC power into DC power and stores it in the battery. The energy storage inverter 131 is connected to the power grid through the electrical control device 133 to realize the two-way flow of electric energy, so that the energy storage device can be operated both on and off the grid. The electrical control device 133 controls and protects the circuit to ensure the safety and reliability of the energy storage device.

[0067] like Figure 1 and Figure 3 As shown, in a feasible implementation, two adjacent battery packs 141 are connected via a DC bus cable 20 and a communication line 21. After the battery pack group is connected to the high-voltage control box 132 via the DC bus cable 20 and the communication line 21, it passes through the energy storage inverter 131, the electric meter 25 and the mutual inductor in sequence, and is then connected to the power grid via the electrical control device 133.

[0068] In this technical solution, the battery packs 141 are interconnected through the DC bus cable 20 and the communication line 21, so that the power balance and unified management between the battery packs 141 are carried out through the high-voltage control box 132. The battery pack group is connected to the high-voltage control box 132 as a whole. The high-voltage control box 132 protects and controls the battery pack 141, and also manages the connection with the energy storage inverter 131. The energy storage inverter 131 converts the DC power in the battery pack 141 into AC power compatible with the power grid. The AC power output by the energy storage inverter 131 is measured and monitored by the electric meter 25 and the mutual inductor to facilitate energy management and provide accurate data support for the operation and maintenance of the energy storage equipment. The electrical switch components ensure that the power supply can be quickly cut off in any abnormal situation to protect the safety of the entire energy storage equipment and the power grid, and improve the stability and reliability of the power grid.

[0069] It is understandable that the energy storage device is connected to the grid for operation, and the energy storage system matching the grid-forming energy storage converter 131 can realize the same functions as the synchronous generator in terms of operation mechanism and characteristics through the synchronous generator body model (VSG). VSG simulates the frequency and voltage regulation process of the synchronous generator, simulates the excitation regulation process of the synchronous generator with reactive-voltage control, provides active inertia support, restores the output characteristics of the synchronous generator, and realizes the grid-forming capability.

[0070] When the power system is disturbed, the parameters such as the moment of inertia J and damping coefficient D controlled by the energy storage inverter VSG slow down the frequency change of the system, which helps to improve the stability of frequency and power angle. The moment of inertia J in the VSG is not a real quantity and can be flexibly determined without being restricted by hardware. At the same time, the grid-type energy storage inverter 131 has an instantaneous overload capacity of 1.2 times, which can better support the inertia response.

[0071] The energy storage system of the energy storage converter 131 can reduce the risk of low-frequency oscillation by flexibly selecting the damping D. On the other hand, the energy storage system can achieve impedance reshaping and oscillation suppression of the characteristic frequency by introducing virtual impedance, active damping and other schemes, so that the energy storage device can suppress broadband oscillations.

[0072] When the grid is under-penetrated, the energy storage system of the energy storage inverter 131 will perform limiting control and overload virtual impedance control to ensure that the energy storage inverter 131 can operate as a voltage source and participate in grid construction during the fault; when the grid is over-penetrated, the grid-forming energy storage inverter 131 will add the terminal voltage to the control in real time for voltage regulation, and participate in grid construction by fast reactive response to suppress grid voltage overcharging, so that the energy storage device has the function of voltage fault ride-through.

[0073] The energy storage system of the energy storage inverter 131 can complete the establishment of AC voltage by itself, provide the required excitation for the main power generation unit, and can also form a power grid by itself when necessary. Due to the large current impact at the moment of black start, a single device may not be able to drive the auxiliary load, and the energy management system (EMS) is required to dispatch multiple grid-building energy storage inverters 131 to start in parallel to support the transformer to establish excitation and complete voltage establishment, so that the energy storage equipment has the ability to start and support restart after the system crashes, so that the grid-building cabinet energy storage equipment can be connected to the grid or off-grid, has strong support for the grid, and can achieve stable support for voltage and frequency. It has the ability to mobilize its own operation and adjust output in real time without external power supply, maintains voltage output through power output adjustment, forms a voltage source grid connection, and maintains system stability. In addition, an independent power grid can be formed in a weak power grid without a rigid voltage source.

[0074] like Figure 1 and Figure 3 As shown, in a feasible embodiment, the grid-type cabinet energy storage device also includes: a fire extinguishing agent tank 22 and a sprinkler pipe 23; the fire extinguishing agent tank 22 is arranged on the top of the cabinet 11; the first end of the sprinkler pipe 23 is connected to the output end of the fire extinguishing agent tank 22, and the second end of the sprinkler pipe 23 extends from the rear side of the electrical compartment 13 to the battery compartment 14.

[0075] In this technical solution, the spray pipe 23 extends from the rear side of the cabinet 11 into the battery compartment 14. Without affecting the heat dissipation and normal use of the battery pack 141, it is ensured that the fire extinguishing agent in the fire extinguishing agent tank 22 can be released into the battery compartment 14 through the spray pipe 23. The fire extinguishing agent first contacts the battery pack 141 to prevent the battery pack 141 from exploding after a fire and increasing the fire, which is beneficial to improving the fire extinguishing efficiency.

[0076] like Figures 1 to 3 As shown, in a feasible implementation, the grid-type cabinet energy storage device also includes: a cabinet door 24, an electric meter 25 and a display screen 26; the cabinet door 24 is rotatably connected to the cabinet body 11; the electric meter 25 is arranged on the cabinet door 24, and the electric meter 25 is used to measure and record the flow of electric energy of the energy storage system; the display screen 26 is arranged on the cabinet door 24 to display information of the energy storage system.

[0077] In this technical solution, the cabinet door 24 is rotatably connected to the cabinet body 11 and fixed by a door lock to protect the equipment in the cabinet body 11 from dust, moisture and other environmental factors, while preventing unauthorized access and / or tampering with the settings to ensure the safety of the energy storage equipment and the energy storage system; the electric meter 25 is used to accurately measure and record the flow of electric energy in the energy storage system during the charging and discharging process to monitor the system performance and efficiency. The data recorded by the electric meter 25 can be used to analyze the system's energy consumption pattern, optimize energy use, and reduce operating costs; the display screen 26 is used to display key information of the energy storage system, facilitate real-time monitoring by operators, and provide a user interface, allowing operators to input instructions or adjust system settings to achieve human-computer interaction.

[0078] It is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0079] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application shall be included in the protection scope of the present application. The above are only preferred implementations of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present application, and these improvements and variations should also be regarded as the protection scope of the present application.

Claims

1. A grid-type cabinet energy storage device, characterized in that: The grid-type cabinet-type energy storage device comprises: Cabinet; A liquid-cooled cabin, wherein a liquid cooler is arranged in the liquid-cooled cabin; An electrical compartment, the electrical compartment being arranged below the liquid-cooled cabin, and an energy storage converter being arranged in the electrical compartment; A battery compartment, wherein the battery compartment is arranged below the electrical compartment, and a battery pack group is arranged in the battery compartment along the height direction of the cabinet, and the battery pack group includes a plurality of battery packs; A liquid cooling pipeline, the liquid cooling pipeline includes a first-level inlet pipe and a second-level inlet pipe, the first end of the first-level inlet pipe is connected to the output end of the liquid cooler, and the second end of the first-level inlet pipe is connected to the liquid inlet of the energy storage inverter; the second-level inlet pipe is arranged along the height direction of the cabinet, the first end of the second-level inlet pipe is connected to the output end of the liquid cooler, and the second end of the second-level inlet pipe is connected to the liquid inlet of the battery pack.

2. A grid-type cabinet energy storage device according to claim 1, characterized in that: The second-level inlet pipe includes a main liquid inlet pipe and a plurality of secondary inlet pipes, the main liquid inlet pipe is arranged along the height direction of the cabinet, the first end of the secondary inlet pipe is connected to the main liquid inlet pipe, the second end of the secondary inlet pipe is connected to the liquid inlet of the battery pack, the secondary inlet pipes correspond to the battery packs one by one, so that the coolant enters the corresponding battery packs in parallel through the secondary inlet pipes.

3. A grid-type cabinet energy storage device according to claim 1, characterized in that: The liquid cooling pipeline also includes a first primary return pipe and a second primary return pipe, wherein the first end of the first primary return pipe is connected to the liquid outlet of the energy storage converter, and the second end of the first primary return pipe is connected to the input end of the liquid cooler; the second primary return pipe is arranged along the height direction of the cabinet, the first end of the first secondary return pipe is connected to the liquid outlet of the battery pack, and the second end of the first secondary return pipe is connected to the input end of the liquid cooler; The second-level return pipe includes a main return pipe and several secondary return pipes. The main return pipe is arranged along the height direction of the cabinet. The first end of the secondary return pipe is connected to the liquid outlet of the battery pack, and the second end of the secondary return pipe is connected to the main return pipe. The secondary return pipes correspond to the battery packs one by one, so that the coolant flows back to the main return pipe in parallel through the secondary return pipes.

4. A grid-type cabinet energy storage device according to claim 1, characterized in that: The liquid cooling cabin is arranged on the top of the cabinet.

5. A grid-type cabinet energy storage device according to claim 4, characterized in that: The rear side wall of the liquid cooler is provided with a heat dissipation port, and the network-type cabinet-type energy storage device further includes: A silencer duct is provided on the outer wall of the rear side of the cabinet, the silencer duct extends along the height direction of the cabinet, and the silencer duct is communicated with the liquid cooling cabin.

6. A grid-type cabinet energy storage device according to claim 5, characterized in that: The silencer duct comprises an air inlet and an air outlet, wherein the air inlet is arranged on a side wall of the silencer duct close to the cabinet, the air inlet is opposite to the heat dissipation port, and the air outlet is arranged at the bottom of the silencer duct.

7. A grid-type cabinet energy storage device according to claim 1, characterized in that: A high-voltage control box and electrical control devices are also arranged in the electrical compartment. The battery pack is electrically connected to the high-voltage control box, the energy storage inverter is electrically connected to the high-voltage control box, and the energy storage inverter is connected to the power grid through the electrical control device.

8. A grid-type cabinet energy storage device according to claim 7, characterized in that: Two adjacent battery packs are connected via a DC bus cable and a communication line. After the battery pack group is connected to the high-voltage control box via the DC bus cable and the communication line, it passes through the energy storage inverter, the electric meter and the mutual inductor in sequence, and is then incorporated into the power grid through the electrical control device.

9. A grid-type cabinet energy storage device according to any one of claims 1 to 8, characterized in that: The grid-type cabinet-type energy storage device further includes: A fire extinguishing agent tank body, wherein the fire extinguishing agent tank body is arranged on the top of the cabinet body; A spray pipe, wherein a first end of the spray pipe is connected to an output end of the fire extinguishing agent tank, and a second end of the spray pipe extends from the rear side of the electrical compartment to the battery compartment.

10. A grid-type cabinet energy storage device according to any one of claims 1 to 8, characterized in that: The grid-type cabinet-type energy storage device further includes: A cabinet door, the cabinet door being rotatably connected to the cabinet body; An electric meter, which is arranged on the cabinet door and is used to measure and record the flow of electric energy of the energy storage system; A display screen is arranged on the cabinet door and displays information of the energy storage system.

Images