Energy storage device

Abstract

The utility model provides an energy storage device. The energy storage equipment comprises a cabinet body which is provided with a first accommodating cavity and a second accommodating cavity; the battery pack structure is arranged in the first accommodating cavity, the battery pack structure comprises a shell, the shell is provided with a liquid inlet end, a mounting cavity and a liquid outlet end, the liquid inlet end is communicated with the liquid outlet end through the mounting cavity, and the mounting cavity is used for mounting a battery module; at least part of the cooling liquid circulating system is arranged in the second containing cavity, the liquid inlet end communicates with the liquid outlet end through the cooling liquid circulating system, and the cooling liquid circulating system is used for achieving circulating flowing of cooling liquid; a cavity between the cavity wall of the first containing cavity and the outer surface of the shell is a sealed cavity. According to the utility model, the problem of low dehumidification reliability of a dehumidification mode in the battery cabinet in the prior art is effectively solved.

Description

Technical Field

[0001] This utility model relates to the field of energy storage equipment technology, and more specifically, to an energy storage device. Background Technology

[0002] Currently, during the operation of the battery cabinet, the internal battery packs need to undergo heat dissipation and cooling operations to prevent overheating and ensure stable operation. During this process, condensation will continuously form on the battery packs with lower surface temperatures. The accumulation of condensation in the battery cabinet can easily lead to increased corrosion of the internal structure and may even cause short circuits or damage to the battery cabinet.

[0003] In existing technologies, some battery cabinets will be equipped with dehumidification systems (such as dehumidifying air conditioners) to continuously reduce the humidity inside the battery cabinet and prevent the formation of condensate.

[0004] However, the above-mentioned methods to avoid condensation not only significantly increase the initial cost and operating energy consumption of the battery cabinet, but also have limited dehumidification reliability. If the humidity in the environment changes significantly in a short period of time or is too high, condensation may continue to be generated, which will seriously affect the service life of the battery cabinet. Utility Model Content

[0005] The main objective of this invention is to provide an energy storage device to solve the problem of low dehumidification reliability in existing battery cabinet dehumidification methods.

[0006] To achieve the above objectives, this utility model provides an energy storage device, comprising: a cabinet having a first receiving cavity and a second receiving cavity; a battery pack structure disposed within the first receiving cavity, the battery pack structure including a shell having a liquid inlet end, a mounting cavity and a liquid outlet end, the liquid inlet end communicating with the liquid outlet end through the mounting cavity, the mounting cavity being used to mount battery modules; and a coolant circulation system, at least a portion of which is disposed within the second receiving cavity, the liquid inlet end communicating with the liquid outlet end through the coolant circulation system, the coolant circulation system being used to realize the circulation flow of coolant; wherein, the cavity between the cavity wall of the first receiving cavity and the outer surface of the shell is a sealed cavity.

[0007] Furthermore, along the height direction of the shell, the height of the liquid inlet end is less than the height of the liquid outlet end.

[0008] Furthermore, the connecting pipe of the coolant circulation system is provided with a connecting structure, which has an inlet, a connecting cavity, an outlet and an exhaust port. The inlet is connected to the outlet through the connecting cavity, and the exhaust port is connected to the connecting cavity. The liquid in the connecting cavity has a liquid level height H1 relative to the bottom wall of the connecting cavity, and the exhaust port has a height H2, which is greater than the liquid level height H1.

[0009] Furthermore, the battery pack structure has a normal operating state and a static operating state. The heat generated by the battery pack structure in the normal operating state is greater than that in the static operating state. When the battery pack structure is in the static operating state, the liquid level H1 along the height direction of the connecting structure is less than the maximum height H3 of the liquid inlet, so as to form a connecting gap in the connecting pipe located between the battery pack structure and the connecting structure. The mounting cavity is connected to the connecting cavity through the connecting gap.

[0010] Furthermore, the connecting structure is disposed in the second receiving cavity, and the cabinet also has an exhaust port communicating with the second receiving cavity. The energy storage device also includes a filter structure disposed at the exhaust port, which is used to filter the gas flowing through the exhaust port.

[0011] Furthermore, the cabinet also has an installation port communicating with the first receiving cavity, and the energy storage device also includes: a control valve, which is set at the installation port, and the valve port of the control valve forms a flow port, so as to control the opening or closing of the flow port through the control valve.

[0012] Furthermore, there are at least two installation ports and at least two control valves, with each of the at least two installation ports corresponding to at least two control valves.

[0013] Furthermore, at least two control valves include a first control valve and a second control valve. The outlet of the first control valve is used to allow gas in the first receiving cavity to flow to the outside of the first receiving cavity, and the outlet of the second control valve is used to allow external gas to flow into the first receiving cavity. The energy storage device also includes a fan structure, which is disposed at the valve port of the first control valve; wherein the first control valve is located above the second control valve.

[0014] Furthermore, the energy storage device also includes: a smoke sensor, the detection end of which is located within the first receiving cavity to detect the smoke concentration value within the first receiving cavity; a control module connected to the smoke sensor, the fan structure, the first control valve, and the second control valve, wherein the control module controls at least one of the rotational speed or direction of the fan structure based on the detection value of the smoke sensor; and / or, the control module controls the first control valve to open or close based on the detection value of the smoke sensor; and / or, the control module controls the second control valve to open or close based on the detection value of the smoke sensor.

[0015] Furthermore, the cabinet includes: a frame structure having an outer frame and a mounting frame disposed on the outer frame; an outer shell, at least partially covering the outer frame to form an inner cavity of the cabinet; and a plate-like partition structure installed at the mounting frame, the plate-like partition structure being used to divide the inner cavity into a first receiving cavity and a second receiving cavity.

[0016] Furthermore, the outer casing includes an outer casing body and a cabinet door. The outer casing body covers the outer frame to form a cabinet body with an opening. The cabinet door is rotatably mounted on the cabinet body for opening or closing the opening. The energy storage device also includes a sealing structure, which is mounted on the surface of the frame structure facing the cabinet door. When the cabinet door is rotated to close the opening, the cabinet door fits into the sealing structure to seal the gap between the cabinet door and the frame structure.

[0017] Applying the technical solution of this utility model, the cabinet of the energy storage device has a first receiving cavity and a second receiving cavity. The battery pack structure is disposed in the first receiving cavity. The shell of the battery pack structure has a liquid inlet end, a mounting cavity, and a liquid outlet end. The liquid inlet end is connected to the liquid outlet end through the mounting cavity. The mounting cavity is used to install the battery module. At least part of the coolant circulation system is disposed in the second receiving cavity. The liquid inlet end is connected to the liquid outlet end through the coolant circulation system to realize the circulation of coolant. The cavity between the cavity wall of the first receiving cavity and the outer surface of the shell is a sealed cavity. Thus, the battery pack structure in this application actually employs an immersion liquid cooling method for heat dissipation. Both the first receiving cavity and the battery pack shell are sealed structures (meaning the cavity between the wall of the first receiving cavity and the outer surface of the shell forms a sealed cavity). Operators can fill the cavity between the wall of the first receiving cavity and the outer surface of the shell with dry gas when the energy storage device leaves the factory. Because this cavity is sealed (humidity does not change), no condensation will form on the outer surface of the battery pack structure during the operation of the energy storage device, fundamentally eliminating the formation of condensation and thus solving the problem of low dehumidification reliability in existing battery cabinet dehumidification methods. Simultaneously, the above configuration also eliminates the need for any additional dehumidification equipment on the energy storage device, thereby reducing the initial processing cost and operating energy consumption of the energy storage device. Attached Figure Description

[0018] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0019] Figure 1 A perspective structural schematic diagram of an embodiment of the energy storage device according to the present invention is shown;

[0020] Figure 2 It shows Figure 1 A cross-sectional view of the energy storage device in the middle;

[0021] Figure 3 It shows Figure 2 Enlarged schematic diagram of point A of the energy storage device in the diagram;

[0022] Figure 4It shows Figure 2 Enlarged schematic diagram of point B of the energy storage device in the diagram;

[0023] Figure 5 It shows Figure 2 Enlarged schematic diagram of point C of the energy storage device;

[0024] Figure 6 It shows Figure 1 A three-dimensional structural diagram of the battery pack structure and coolant circulation system of the energy storage device after assembly.

[0025] Figure 7 It shows Figure 6 A magnified schematic diagram of point D after the battery pack structure and coolant circulation system are assembled.

[0026] Figure 8 It shows Figure 6 An enlarged schematic diagram of point E after the battery pack structure and coolant circulation system are assembled.

[0027] The above figures include the following reference numerals:

[0028] 10. Cabinet body; 11. First receiving cavity; 12. Second receiving cavity; 13. Vent hole; 14. Mounting port; 15. Frame structure; 151. Outer frame; 152. Mounting frame; 16. Outer shell; 161. Outer shell body; 162. Cabinet door; 17. Panel partition structure;

[0029] 20. Battery pack structure; 21. Housing; 211. Liquid inlet; 212. Liquid outlet;

[0030] 30. Coolant circulation system; 31. Connecting structure; 311. Inlet; 312. Outlet; 313. Exhaust port; 314. Cover; 315. Main body of the housing; 32. Pump body; 33. Cooling device;

[0031] 40. Filter structure;

[0032] 50. Control valve;

[0033] 60. Fan structure;

[0034] 70. Smoke sensor;

[0035] 80. Sealed structure. Detailed Implementation

[0036] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0037] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0038] In this utility model, unless otherwise stated, directional terms such as "upper" and "lower" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction; similarly, for ease of understanding and description, "left" and "right" are generally used in relation to the left and right shown in the accompanying drawings; "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not used to limit this utility model.

[0039] To address the issue of low dehumidification reliability in existing battery cabinet dehumidification methods, this application provides an energy storage device.

[0040] like Figures 1 to 8 As shown, the energy storage device includes a cabinet 10, a battery pack structure 20, and a coolant circulation system 30. The cabinet 10 has a first receiving cavity 11 and a second receiving cavity 12. The battery pack structure 20 is disposed within the first receiving cavity 11 and includes a housing 21. The housing 21 has a liquid inlet 211, a mounting cavity, and a liquid outlet 212. The liquid inlet 211 communicates with the liquid outlet 212 through the mounting cavity, which is used to install battery modules. At least a portion of the coolant circulation system 30 is disposed within the second receiving cavity 12. The liquid inlet 211 communicates with the liquid outlet 212 through the coolant circulation system 30, which is used to achieve the circulation of coolant. The cavity between the wall of the first receiving cavity 11 and the outer surface of the housing 21 is a sealed cavity.

[0041] Applying the technical solution of this embodiment, the cabinet 10 of the energy storage device has a first receiving cavity 11 and a second receiving cavity 12. The battery pack structure 20 is disposed in the first receiving cavity 11. The shell 21 of the battery pack structure 20 has a liquid inlet end 211, a mounting cavity, and a liquid outlet end 212. The liquid inlet end 211 is connected to the liquid outlet end 212 through the mounting cavity. The mounting cavity is used to install the battery module. At least a portion of the coolant circulation system 30 is disposed in the second receiving cavity 12. The liquid inlet end 211 is connected to the liquid outlet end 212 through the coolant circulation system 30 to realize the circulation of coolant. The cavity between the cavity wall of the first receiving cavity 11 and the outer surface of the shell 21 is a sealed cavity. Thus, in this embodiment, the battery pack structure 20 actually employs an immersion liquid cooling method for heat dissipation. Both the first receiving cavity 11 and the shell 21 of the battery pack structure 20 are sealed structures (i.e., the cavity between the wall of the first receiving cavity 11 and the outer surface of the shell 21 forms a sealed cavity). Operators can fill the cavity between the wall of the first receiving cavity 11 and the outer surface of the shell 21 with dry gas when the energy storage device leaves the factory. Because this cavity is sealed (humidity will not change), no condensation will be generated on the outer surface of the battery pack structure 20 during the operation of the energy storage device, fundamentally eliminating the formation of condensation and thus solving the problem of low dehumidification reliability in existing battery cabinet dehumidification methods. Simultaneously, the above configuration also eliminates the need for any additional dehumidification equipment on the energy storage device, thereby reducing the initial processing cost and operating energy consumption of the energy storage device.

[0042] like Figure 8 As shown, along the height direction of the housing 21, the height of the liquid inlet end 211 is less than the height of the liquid outlet end 212.

[0043] Specifically, the immersion liquid cooling heat dissipation method in this embodiment further adopts an overflow coolant flow method. That is, during the circulation of coolant, the coolant flowing into the mounting cavity through the inlet end 211 will gradually fill the space in the mounting cavity until the liquid level rises to the height of the outlet end 212, at which point it will flow out of the mounting cavity through the outlet end 212. During this process, the coolant will gradually squeeze the gas in the mounting cavity so that the gas in the mounting cavity is basically discharged to the outside of the mounting cavity through the outlet end 212, thereby realizing the discharge of gas in the mounting cavity.

[0044] like Figure 1 , Figure 6 and Figure 7As shown, the coolant circulation system 30 has a connecting structure 31 on its connecting pipe. The connecting structure 31 has an inlet 311, a connecting cavity, an outlet 312, and an exhaust port 313. The inlet 311 is connected to the outlet 312 through the connecting cavity, and the exhaust port 313 is connected to the connecting cavity. The liquid level in the connecting cavity has a height H1 relative to the bottom wall, and the exhaust port 313 has a height H2, which is greater than the liquid level height H1. This allows the coolant circulation system 30 to discharge gases generated during battery module operation, preventing excessive internal pressure in the battery pack structure 20 or the coolant circulation system 30, which could lead to damage or even explosion, thus improving the operational safety of the energy storage device. Simultaneously, the height H2 of the exhaust port 313 prevents leakage.

[0045] Specifically, during the long-term operation of the energy storage device, the battery modules inside the battery pack structure 20 will inevitably generate gas. In this embodiment, the overflow coolant flow method will discharge the gas into the coolant circulation system 30. When the gas flows into the connecting structure 31 with the coolant, it will flow out through the exhaust port 313 into the second receiving cavity 12 to avoid increasing the gas pressure in the battery pack structure 20 and the coolant circulation system 30.

[0046] Specifically, the connecting structure 31 is a rectangular box, comprising a main body 315 and a cover 314. The main body 315 has a liquid inlet 311 and a liquid outlet 312. The cover 314 covers the main body 315 with a certain gap between it and the main body 315, forming an exhaust port 313. The gap can be formed by providing a supporting protrusion or a snap-fit ​​structure between the main body 315 and the cover 314. The structure is relatively conventional and will not be described in detail here.

[0047] In this embodiment, the battery pack structure 20 has a normal operating state and a static operating state. The heat generated by the battery pack structure 20 in the normal operating state is greater than that in the static operating state. Specifically, when the battery pack structure 20 is in the static operating state, the liquid level H1 along the height direction of the connecting structure 31 is less than the maximum height H3 of the inlet 311, thus forming a connecting gap within the connecting pipe located between the battery pack structure 20 and the connecting structure 31. The mounting cavity communicates with the connecting cavity through this connecting gap.

[0048] Specifically, the battery pack structure 20 generates a large amount of heat when in normal operation, and the coolant circulation system 30 operates normally. However, the battery pack structure 20 generates a small amount of heat when in a static state, and the coolant circulation system 30 stops operating.

[0049] Thus, when the battery pack structure 20 is in a static operating state for a long period of time, the gas it generates will displace the original air inside the battery pack structure 20 (when the battery pack structure 20 is in normal operating state, the generated gas is basically carried away by the coolant, so the above problem will not occur). Over time, this accumulation will completely replace the air inside the battery pack structure 20, affecting the flow rate of the coolant overflow (i.e., different gas types and pressures). Therefore, when the battery pack structure 20 is in a static operating state, the liquid level H1 in the connecting structure 31 is lower than that inlet 311. That is, the gas inside the battery pack structure 20 can circulate and exchange with the gas (air) in the connecting structure 31 through the outlet 212 and the inlet 311 to dilute the gas inside the battery pack structure 20 and avoid the generation of pressure difference.

[0050] Specifically, the height of the outlet 312 is smaller than the height of the inlet 311 to ensure that the coolant can flow smoothly.

[0051] It should be noted that the liquid level H1 is determined by the initial design parameters of the energy storage device. The liquid level H1 can be ensured to be less than the maximum height H3 of the inlet 311 by adjusting the total amount of coolant in the coolant circulation system 30. Alternatively, a corresponding drive pump can be added to adjust the inlet speed of the inlet 311 and the outlet speed of the outlet 312 to ensure that the liquid level H1 is less than the maximum height H3 of the inlet 311.

[0052] Specifically, although the connecting structure 31 in this embodiment enables gas discharge, it also causes the coolant circulation system 30 to be connected to the atmosphere. That is, when the coolant is not circulating, there will be no coolant in the outlet pipe at the outlet end of the battery pack structure 20, and the battery pack structure 20 will also be connected to the atmosphere. However, in this embodiment, no condensation will be generated on the surface of the battery pack structure 20 or the surface of the battery modules located within the battery pack structure 20. This is mainly due to the overflow flow mode of the coolant. Specifically:

[0053] When the battery pack structure 20 is in a static operating state, the coolant circulation system 30 will not operate. Due to the presence of the connecting structure 31, there will be no coolant in the outlet pipe of the outlet end 212 of the battery pack structure 20. The battery pack structure 20 is connected to the atmosphere through the connecting structure 31, with no temperature difference or a very small temperature difference. Moreover, the battery pack structure 20 is made of SMC material, and no condensation will form on the surface of the battery module or the surface of the battery pack structure 20. In normal operating state, the coolant circulation system 30 is running. At this time, in the initial flow of the coolant, it can expel some of the gas in the installation cavity. At the same time, when the coolant flows out through the outlet end 212, it will fill and seal the outlet pipe of the outlet end 212 of the battery pack structure 20. The entire installation cavity is sealed by the coolant, blocking the exchange of hot and cold gases between the internal and external environments. The entire battery pack structure 20 is also a radiation source, radiating heat outward, thereby effectively preventing the formation of condensation inside and outside the battery pack structure 20.

[0054] Optionally, the battery pack structure 20 may not have perfect airtightness. For example, during actual manufacturing, the battery pack structure 20 may be fixed using fasteners. Due to the choice of manufacturing process, the battery pack structure 20 will have some small connecting gaps. However, in this embodiment, the above-mentioned arrangement ensures that the gas inside the battery pack structure 20 will not leak into the first receiving cavity 11 (the leakage is too small). Therefore, even if the battery pack structure 20 does not have perfect airtightness, condensation will not occur inside the first receiving cavity 11, thereby reducing the manufacturing requirements of the battery pack structure 20. Of course, the battery pack structure 20 is preferably a completely sealed structure to further prevent gas leakage.

[0055] Specifically, the coolant circulation system 30 in this embodiment is also equipped with a matching pump body 32 and a cooling device 33. The pump body 32 is used to realize the flow of coolant, while the cooling device 33 is used to maintain the coolant at a lower temperature. The structure of the coolant circulation system 30 is relatively conventional and will not be described in detail here.

[0056] Specifically, the cabinet 10 can be fitted with sealing measures (such as applying sealant or adding sealing rings) according to the actual structural layout to ensure that the first receiving cavity 11 is a sealed cavity.

[0057] like Figure 1 and Figure 2As shown, the connecting structure 31 is disposed in the second receiving cavity 12. The cabinet 10 also has an exhaust port 13 communicating with the second receiving cavity 12. The energy storage device also includes a filter structure 40, which is disposed at the exhaust port 13 and is used to filter the gas flowing through the exhaust port 13. In this way, the gas discharged into the second receiving cavity 12 by the connecting structure 31 can be discharged through the exhaust port 13 to avoid excessive pressure in the second receiving cavity 12, thereby improving the operational safety of the energy storage device. At the same time, the filter structure 40 can filter the gas flowing into or out of the second receiving cavity 12 to prevent dust and impurities from entering the second receiving cavity 12, thereby extending the service life of the energy storage device.

[0058] Specifically, the exhaust vent 13 consists of multiple fine, small-diameter holes machined on the cabinet 10. While ensuring a sufficiently large connection area, it also serves as a preliminary filter and protection function.

[0059] Specifically, the filter structure 40 is a dustproof mesh, which is installed on the cavity wall of the second receiving cavity 12.

[0060] like Figure 1 As shown, the cabinet 10 also has an installation port 14 communicating with the first receiving cavity 11. The energy storage device also includes a control valve 50, which is installed at the installation port 14. The valve port of the control valve 50 forms a flow port, so that the flow port can be opened or closed by controlling the control valve 50. In this way, the flow port formed by the control valve 50 can play an explosion-proof role. That is, if the electrical components in the energy storage device fail, are damaged, or generate smoke, causing the pressure value in the first receiving cavity 11 to be too high, the operator can open the flow port by controlling the control valve 50 to relieve pressure. On the other hand, when the energy storage device is operating normally, the operator can operate the control valve 50 to close it to maintain the sealing state of the first receiving cavity 11.

[0061] Optionally, the control valve 50 is an electric actuator explosion-proof valve.

[0062] Optionally, there are at least two mounting ports 14 and at least two control valves 50, with at least two mounting ports 14 corresponding to at least two control valves 50. In this way, when the energy storage device fails or is damaged, the above-mentioned arrangement of the control valves 50 allows the first receiving cavity 11 to form an airflow path with the outside, ensuring that the smoke in the first receiving cavity 11 can be quickly and effectively discharged to the outside of the first receiving cavity 11.

[0063] like Figure 1As shown, at least two control valves 50 include a first control valve and a second control valve. The outlet of the first control valve is used to allow gas in the first receiving chamber 11 to flow out of the first receiving chamber 11, and the outlet of the second control valve is used to allow external gas to flow into the first receiving chamber 11. The energy storage device also includes a fan structure 60, which is located at the valve port of the first control valve. The first control valve is positioned above the second control valve. Thus, in the event of a malfunction in the energy storage device, the fan structure 60 can accelerate the airflow to further increase the smoke discharge rate from the first receiving chamber 11. Simultaneously, the position of the fan structure 60 (the first control valve is located above the second control valve) can adapt to the airflow direction (hotter smoke rises) to further increase the smoke discharge rate.

[0064] like Figure 1 As shown, the energy storage device also includes: a smoke sensor 70, the detection end of which is located within the first receiving cavity 11 to detect the smoke concentration value within the first receiving cavity 11; a control module connected to the smoke sensor 70, the fan structure 60, the first control valve, and the second control valve; the control module controls at least one of the rotational speed or direction of the fan structure 60 based on the detection value of the smoke sensor 70; and / or, the control module controls the first control valve to open or close based on the detection value of the smoke sensor 70; and / or, the control module controls the second control valve to open or close based on the detection value of the smoke sensor 70. Thus, the above configuration enables automated and intelligent fire-fighting operation of the energy storage device, ensuring that the energy storage device can promptly open the control valve 50 and automatically discharge the smoke.

[0065] Specifically, when the smoke sensor 70 detects that the smoke concentration in the first receiving cavity 11 is too high, the control module can control the first control valve and the second control valve to open synchronously, and control the fan structure 60 to run, so as to realize the automatic discharge of smoke.

[0066] Specifically, a fire-fighting device is also installed in the first containment cavity 11. The fire-fighting device is used to discharge fire-fighting gases (such as carbon dioxide, nitrogen, etc.) into the first containment cavity 11. The control module is also connected to the fire-fighting device. When the smoke sensor 70 detects that the smoke concentration value in the first containment cavity 11 is too high, the control module will also control the fire-fighting device to open in order to prevent the energy storage device from catching fire.

[0067] like Figure 1 and Figure 2As shown, the cabinet 10 includes: a frame structure 15 having an outer frame 151 and a mounting frame 152 disposed on the outer frame 151; an outer shell 16, at least partially covering the outer frame 151 to form the inner cavity of the cabinet 10; and a plate-like partition structure 17 installed at the mounting frame 152, the plate-like partition structure 17 being used to divide the inner cavity into a first receiving cavity 11 and a second receiving cavity 12. Thus, while the above-mentioned arrangement forms the first receiving cavity 11 and the second receiving cavity 12 through the plate-like partition structure 17, it also simplifies the structure of the cabinet 10, making it easier to manufacture, thereby reducing the manufacturing cost of the cabinet 10 and the manufacturing difficulty for workers.

[0068] In this embodiment, the cabinet 10 is a rectangular parallelepiped structure.

[0069] It should be noted that the structure of cabinet 10 is not limited to this. For example, the frame structure 15 can be adapted to the actual processing situation, or a plate structure can be directly welded and spliced ​​to form cabinet 10, as long as it can form a cabinet 10 with high structural strength.

[0070] like Figures 1 to 5 As shown, the outer casing 16 includes a main casing 161 and a cabinet door 162. The main casing 161 covers the outer frame 151 to form a cabinet body 10 with an opening. The cabinet door 162 is rotatably mounted on the cabinet body 10 for opening or closing the opening. The energy storage device also includes a sealing structure 80, which is disposed on the surface of the frame structure 15 facing the cabinet door 162. When the cabinet door 162 is rotated to close the opening, the cabinet door 162 fits against the sealing structure 80, sealing the gap between the cabinet door 162 and the frame structure 15. This design of the cabinet door 162 facilitates the inspection and maintenance of electrical components inside the cabinet 10. Simultaneously, the sealing structure 80 seals the gap between the cabinet door 162 and the cabinet body, ensuring high sealing reliability of the first receiving cavity 11.

[0071] In this embodiment, the sealing structure 80 is an annular sealing strip. There are two sealing structures 80. One sealing structure 80 is arranged around the opening of the first receiving cavity 11, and the other sealing structure 80 is arranged around the opening of the second receiving cavity 12. When the cabinet door 162 is closed, the cabinet door 162 will squeeze the sealing structure 80 to undergo elastic deformation, so as to ensure that the first receiving cavity 11 has high sealing reliability.

[0072] As can be seen from the above description, the embodiments of this utility model achieve the following technical effects:

[0073] The energy storage device's cabinet has a first receiving cavity and a second receiving cavity. The battery pack structure is disposed within the first receiving cavity. The battery pack structure's housing has a liquid inlet, a mounting cavity, and a liquid outlet. The liquid inlet communicates with the liquid outlet through the mounting cavity. The mounting cavity is used to install the battery module. At least part of the coolant circulation system is disposed in the second receiving cavity. The liquid inlet communicates with the liquid outlet through the coolant circulation system to achieve coolant circulation. The cavity between the wall of the first receiving cavity and the outer surface of the housing is a sealed cavity. Thus, the battery pack structure in this application actually employs an immersion liquid cooling method for heat dissipation. Both the first receiving cavity and the battery pack shell are sealed structures (meaning the cavity between the wall of the first receiving cavity and the outer surface of the shell forms a sealed cavity). Operators can fill the cavity between the wall of the first receiving cavity and the outer surface of the shell with dry gas when the energy storage device leaves the factory. Because this cavity is sealed (humidity does not change), no condensation will form on the outer surface of the battery pack structure during the operation of the energy storage device, fundamentally eliminating the formation of condensation and thus solving the problem of low dehumidification reliability in existing battery cabinet dehumidification methods. Simultaneously, the above configuration also eliminates the need for any additional dehumidification equipment on the energy storage device, thereby reducing the initial processing cost and operating energy consumption of the energy storage device.

[0074] Obviously, the embodiments described above are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0075] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0076] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0077] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An energy storage device, characterized in that, include: The cabinet (10) has a first receiving cavity (11) and a second receiving cavity (12); A battery pack structure (20) is disposed in the first receiving cavity (11). The battery pack structure (20) includes a housing (21). The housing (21) has a liquid inlet end (211), a mounting cavity and a liquid outlet end (212). The liquid inlet end (211) is connected to the liquid outlet end (212) through the mounting cavity. The mounting cavity is used to install the battery module. A coolant circulation system (30) is provided, at least a portion of which is disposed in the second accommodating cavity (12). The inlet end (211) is connected to the outlet end (212) through the coolant circulation system (30). The coolant circulation system (30) is used to realize the circulation flow of coolant. The cavity between the cavity wall of the first receiving cavity (11) and the outer surface of the shell (21) is a sealed cavity.

2. The energy storage device according to claim 1, characterized in that, Along the height direction of the housing (21), the height of the liquid inlet (211) is less than the height of the liquid outlet (212).

3. The energy storage device according to claim 1, characterized in that, The coolant circulation system (30) has a connecting structure (31) on its connecting pipe. The connecting structure (31) has an inlet (311), a connecting cavity, an outlet (312), and an exhaust port (313). The inlet (311) is connected to the outlet (312) through the connecting cavity, and the exhaust port (313) is connected to the connecting cavity. The liquid in the communicating cavity has a liquid level height H1 relative to the bottom wall of the communicating cavity, and the exhaust port (313) has a height H2, wherein the height H2 is greater than the liquid level height H1.

4. The energy storage device according to claim 3, characterized in that, The battery pack structure (20) has a normal operating state and a static operating state. The heat generated by the battery pack structure (20) in the normal operating state is greater than the heat generated by the battery pack structure (20) in the static operating state. When the battery pack structure (20) is in the stationary operating state, the liquid level height H1 along the height direction of the connecting structure (31) is less than the maximum height H3 of the liquid inlet (311), so as to form a connecting gap in the connecting pipe between the battery pack structure (20) and the connecting structure (31), and the mounting cavity is connected to the connecting cavity through the connecting gap.

5. The energy storage device according to claim 3, characterized in that, The connecting structure (31) is disposed in the second receiving cavity (12), and the cabinet (10) also has an exhaust port (13) communicating with the second receiving cavity (12). The energy storage device further includes: A filter structure (40) is provided at the exhaust port (13) for filtering the gas flowing through the exhaust port (13).

6. The energy storage device according to claim 5, characterized in that, The cabinet (10) also has a mounting port (14) communicating with the first receiving cavity (11), and the energy storage device further includes: A control valve (50) is provided at the mounting port (14), and the valve port of the control valve (50) forms a flow port so as to control the flow port to open or close.

7. The energy storage device according to claim 6, characterized in that, There are at least two mounting ports (14) and at least two control valves (50), with at least two mounting ports (14) and at least two control valves (50) arranged in a one-to-one correspondence.

8. The energy storage device according to claim 1, characterized in that, At least two control valves (50) include a first control valve and a second control valve. The outlet of the first control valve is used to allow gas in the first receiving chamber (11) to flow to the outside of the first receiving chamber (11). The outlet of the second control valve is used to allow external gas to flow into the first receiving chamber (11). The energy storage device further includes: The fan structure (60) is located at the valve port of the first control valve; wherein the first control valve is located above the second control valve.

9. The energy storage device according to claim 8, characterized in that, The energy storage device also includes: A smoke sensor (70) is provided, the detection end of which is located in the first receiving cavity (11) for detecting the smoke concentration value in the first receiving cavity (11). The control module is connected to the smoke sensor (70), the fan structure (60), the first control valve, and the second control valve. The control module controls at least one of the rotational speed or direction of the fan structure (60) based on the detection value of the smoke sensor (70); and / or, the control module controls the first control valve to open or close based on the detection value of the smoke sensor (70); and / or, the control module controls the second control valve to open or close based on the detection value of the smoke sensor (70).

10. The energy storage device according to claim 1, characterized in that, The cabinet (10) includes: The frame structure (15) has an outer frame (151) and a mounting frame (152) disposed on the outer frame (151); The outer shell (16), at least a portion of which covers the outer frame (151), forms the inner cavity of the cabinet (10); A plate-shaped partition structure (17) is installed at the mounting frame (152) to divide the inner cavity into a first receiving cavity (11) and a second receiving cavity (12).

11. The energy storage device according to claim 10, characterized in that, The outer shell (16) includes an outer shell body (161) and a cabinet door (162). The outer shell body (161) covers the outer frame (151) to form a cabinet (10) body with an opening. The cabinet door (162) is flipped on the cabinet (10) body to open or close the opening. The energy storage device further includes a sealing structure (80), which is disposed on the surface of the frame structure (15) facing the cabinet door (162). When the cabinet door (162) is flipped to close the opening, the cabinet door (162) fits against the sealing structure (80) to seal the gap between the cabinet door (162) and the frame structure (15) through the sealing structure (80).

Images