Energy storage device, energy storage system and electric equipment

Abstract

The embodiment of the invention relates to the technical field of energy storage, and provides an energy storage device, an energy storage system and electric equipment.The energy storage device comprises a shell and an overflow plate, the overflow plate is installed in the shell to divide the shell into an installation groove and an overflow groove, and the top end of the overflow plate is lower than the top end of the shell; the battery pack is mounted in the mounting groove, and the electrical element is mounted in the overflow groove; the liquid outlet pipe is arranged on the side wall of the shell in a penetrating mode, one part of the liquid outlet pipe is arranged in the overflow groove, the other part of the liquid outlet pipe extends out of the shell, and the liquid inlet end of the liquid outlet pipe is higher than the top end of the overflow plate. According to the energy storage device provided by the embodiment of the invention, at least the liquid level adjustment convenience of the immersion cooling liquid of the energy storage device by a worker can be improved.

Description

Technical Field

[0001] This application relates to the field of energy storage technology, and in particular to an energy storage device, an energy storage system, and an electrical appliance. Background Technology

[0002] Currently, submersible battery packs, as a novel battery packaging method, are based on the principle of completely immersing the battery cells in a liquid medium to improve cooling efficiency and safety. This design utilizes the effective heat transfer properties of the liquid medium to promptly remove the heat generated during battery operation, significantly reducing battery temperature, thereby extending battery life and increasing energy density.

[0003] However, in practical applications and maintenance, submerged battery packs typically contain electrolytes or special coolants. These liquids need to be maintained within a suitable range to ensure that the battery cells are adequately cooled while avoiding the risk of short circuits due to excessive liquid levels. However, due to the enclosed design and large size of the battery pack, directly observing or manually adjusting the liquid level becomes extremely difficult. Summary of the Invention

[0004] This application provides an energy storage device, an energy storage system, and an electrical appliance to solve the technical problem that the level of the immersion coolant in the energy storage device is not easy to adjust in the prior art.

[0005] According to some embodiments of this application, one aspect of this application provides an energy storage device, including: a housing and an overflow plate, the overflow plate being installed inside the housing to divide the housing into a mounting groove and an overflow groove, the top of the overflow plate being lower than the top of the housing; a battery pack and electrical components, the battery pack being installed in the mounting groove and the electrical components being installed in the overflow groove; and an outlet pipe passing through the side wall of the housing, a portion of the outlet pipe being disposed in the overflow groove and the other portion of the outlet pipe extending outside the housing, the height of the inlet end of the outlet pipe being higher than the top of the overflow plate.

[0006] In some embodiments, the end face of the liquid inlet is parallel to the bottom surface of the housing; and / or, the height of the liquid inlet is higher than the height of the liquid outlet of the liquid outlet pipe.

[0007] In some embodiments, the outlet pipe includes: a first pipe section and a second pipe section that are interconnected, the first pipe section extending along the height direction of the housing, the second pipe section being arranged parallel to the bottom surface of the housing, a portion of the second pipe section and the first pipe section being disposed in an overflow trough, and another portion of the second pipe section extending out of the housing.

[0008] In some embodiments, the top of the overflow plate includes a first end face and a second end face connected to each other. The height of the second end face is lower than the height of the first end face. The second end face is located on the side of the first end face near the liquid outlet pipe and is flush with the top surface of the battery pack.

[0009] In some embodiments, the energy storage device further includes a flow detection element disposed at the liquid outlet end of the liquid outlet pipe, the flow detection element being used to detect the liquid flow rate at the liquid outlet end.

[0010] In some embodiments, the energy storage device further includes: a control unit electrically connected to a flow sensor; a flow control valve disposed at the liquid inlet of the housing, the flow control valve being used to regulate the flow rate at the liquid inlet; and a temperature sensor for detecting the temperature of the immersion coolant within the housing; wherein the control unit is configured to: adjust the opening of the flow control valve based on the flow rate detected by the flow sensor and / or the temperature detected by the temperature sensor.

[0011] In some embodiments, the control unit is further configured to: compare the flow rate detected by the flow sensor with a first preset flow rate; when the flow rate detected by the flow sensor is greater than or equal to the first preset flow rate, determine that the height of the immersion coolant in the housing is higher than the first end face, and control the flow control valve to maintain the current opening or control the flow control valve to reduce the opening; when the flow rate detected by the flow sensor is less than the first preset flow rate, adjust the opening of the flow control valve according to the flow rate detected by the flow sensor and the temperature detected by the temperature sensor.

[0012] In some embodiments, the control unit is further configured to: when the flow rate detected by the flow sensor is less than a first preset flow rate and greater than 0, determine that the height of the immersion liquid inside the housing and the height of the first end face are within a first preset height range, and obtain the temperature of the immersion coolant; when the temperature of the immersion coolant is within a preset temperature range, control the flow control valve to maintain its current opening; when the temperature of the immersion coolant exceeds the preset temperature range, control the flow control valve to increase its opening; when the flow rate detected by the flow sensor is 0, determine that the height of the immersion liquid inside the housing and the height of the second end face are within a second preset height range, and control the flow control valve to increase its opening.

[0013] In some embodiments, when the flow control valve is opened to a greater degree, the control unit is further configured to: continuously acquire the temperature of the submerged coolant, and when the temperature of the submerged coolant returns to a preset temperature range, adjust the opening of the flow control valve according to a comparison between the flow rate detected by the flow sensor and the magnitude of a first preset flow rate.

[0014] Another embodiment of this application provides an energy storage system, including a control module, a management module, and the aforementioned energy storage device. The control module is electrically connected to the energy storage device to monitor the charging and discharging of the energy storage device, and the management module is connected to the energy storage device to collect and analyze the data of the energy storage device.

[0015] Another embodiment of this application provides an electrical device, including the above-described energy storage device, power conversion module, user interface, and control unit. The power conversion module is connected to the energy storage device to adjust the output power of the energy storage device. The user interface provides information about the energy storage device to the user. The control unit is used to coordinate the power conversion module and the user interface.

[0016] The technical solution provided in this application has at least the following advantages:

[0017] The overflow plate divides the internal space of the casing into two spaces: the mounting slot and the overflow slot. The immersion coolant used to cool the battery pack will first fill the mounting slot to ensure that the battery pack is submerged, and then flow over the overflow plate into the overflow slot. At this time, since the height of the inlet end of the outlet pipe is higher than the top of the overflow plate, the immersion coolant will only flow from the inlet end into the outlet pipe and out of the outlet pipe after the mounting slot and the overflow slot are filled and the liquid level is higher than the inlet end of the outlet pipe. Therefore, when staff observe that the immersion coolant is flowing normally from the outlet pipe, they can determine that the immersion coolant has filled the entire installation tank, and the battery pack is in a state of being fully immersed and cooled by the immersion coolant. When staff observe that no immersion coolant is flowing out of the outlet pipe, they can determine that the immersion coolant has not filled the installation tank, and the battery pack has not received sufficient immersion and cooling by the immersion coolant. Staff can then inject immersion coolant into the installation tank, realizing the adjustment of the immersion coolant level of the energy storage device by the staff, ensuring the reliability of cooling the battery pack, and thus solving the technical problem of the inconvenience of adjusting the immersion coolant level in the existing technology of energy storage devices.

[0018] Meanwhile, the overflow plate divides the internal space of the casing into two spaces: the mounting slot and the overflow slot. This allows the battery pack and electrical components to be installed independently in the mounting slot and the overflow slot, ensuring that there is no interference between the battery pack and the electrical components, and ensuring the independent operation and safety of the battery pack and the electrical components, thereby ensuring the operational reliability of the energy storage device. Attached Figure Description

[0019] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Unless otherwise stated, the drawings in the accompanying drawings do not constitute a limitation on scale. In order to more clearly illustrate the technical solutions in the embodiments of this application or in the conventional art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 An overall structural diagram of an embodiment of the energy storage device according to the present invention is shown;

[0021] Figure 2 It shows Figure 1 Internal diagram of a portion of the energy storage device;

[0022] Figure 3 It shows Figure 2 A magnified view of a portion of the image.

[0023] The above figures include the following reference numerals:

[0024] 10. Outer casing; 11. Mounting slot; 12. Overflow slot;

[0025] 20. Overflow plate; 21. First end face; 22. Second end face;

[0026] 30. Battery pack;

[0027] 50. Outlet pipe; 51. Inlet end; 52. Outlet end; 53. First pipe section; 54. Second pipe section. Detailed Implementation

[0028] As can be seen from the background technology, it is currently inconvenient for staff to adjust the level of the immersion coolant in the energy storage device.

[0029] To improve the convenience of staff in adjusting the level of the immersion coolant in the energy storage device, embodiments of this application provide an energy storage device, an energy storage system, and an electrical device.

[0030] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0031] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0032] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A exists, A and B exist simultaneously, and B exists. In addition, the character " / " in this document generally indicates that the related objects before and after it have an "or" relationship.

[0033] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0034] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0035] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0036] In the accompanying drawings corresponding to the embodiments of this application, the thickness and area of ​​the layers are enlarged for better understanding and ease of description. When describing a component (such as a layer, film, region, or substrate) on or on the surface of another component, the component may be "directly" located on the surface of the other component, or there may be a third component between the two components. Conversely, when describing a component on the surface of another component, or when another component is formed or disposed on the surface of a component, it indicates that there is no third component between the two components. Furthermore, when describing a component as being "generally" formed on another component, it means that the component is not formed on the entire surface (or front surface) of the other component, nor is it formed on a portion of the edge of the entire surface.

[0037] In the description of the embodiments of this application, when a component "includes" another component, other components are not excluded unless otherwise stated, and other components may be further included. Furthermore, when a component such as a layer, film, region, or plate is referred to as being "on / located" on another component, it can be "directly on" the other component (i.e., located on the surface of the other component with no other components between them), or another component may be present therein. Moreover, when a component such as a layer, film, region, or plate is "directly located" on another component, or when a component such as a layer, film, region, or plate is located on the surface of another component, it indicates that no other components are located therein.

[0038] The terminology used in the description of the various embodiments herein is for the purpose of describing particular embodiments only and is not intended to be limiting. As used in the description of the various embodiments and the appended claims, the term "part" is also intended to include the plural form unless the context clearly indicates otherwise. Components include layers, films, regions, or plates, etc.

[0039] The embodiments of this application will now be described in detail with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been provided in the embodiments of this application to facilitate a better understanding of the application. However, the technical solutions claimed in this application can be implemented even without these technical details and various variations and modifications based on the following embodiments.

[0040] This application provides an energy storage device, an energy storage system, and an electrical device, which at least improves the convenience for workers to adjust the level of the immersion coolant in the energy storage device.

[0041] like Figures 1 to 3As shown, the energy storage device includes a housing 10, an overflow plate 20, a battery pack 30, electrical components, and an outlet pipe 50. The overflow plate 20 is installed inside the housing 10 to divide the housing 10 into a mounting groove 11 and an overflow groove 12, with the top of the overflow plate 20 positioned below the top of the housing 10. The battery pack 30 is installed in the mounting groove 11, and the electrical components are installed in the overflow groove 12. The outlet pipe 50 passes through the side wall of the housing 10, with a portion of the outlet pipe 50 located within the overflow groove 12 and the other portion extending outside the housing 10. The inlet end 51 of the outlet pipe 50 is positioned above the top of the overflow plate 20.

[0042] By applying the technical solution of this embodiment, the overflow plate 20 can divide the internal space of the outer casing 10 into two spaces: the mounting groove 11 and the overflow groove 12. In this way, the immersion coolant used to cool the battery pack 30 will first fill the mounting groove 11 to ensure that the battery pack 30 is submerged, and then flow over the overflow plate 20 into the overflow groove 12. At this time, since the height of the inlet end 51 of the outlet pipe 50 is higher than the top of the overflow plate 20, the immersion coolant will flow from the inlet end 51 into the outlet pipe 50 and out of the outlet pipe 50 only after the mounting groove 11 and the overflow groove 12 are filled. Therefore, when the staff observes that the immersion coolant is flowing normally from the outlet pipe 50, it can be determined that the immersion coolant has filled the entire installation tank 11, and the battery pack 30 is in a state of being fully immersed and cooled by the immersion coolant. When the staff observes that no immersion coolant is flowing out of the outlet pipe 50, it can be determined that the immersion coolant has not filled the installation tank 11, and the battery pack 30 has not received sufficient immersion and cooling by the immersion coolant. The staff can then inject immersion coolant into the installation tank 11, realizing the adjustment of the liquid level of the immersion coolant of the energy storage device by the staff, ensuring the cooling reliability of the battery pack 30, and thus solving the technical problem that the liquid level of the immersion coolant of the energy storage device is not easy to adjust in the prior art. Meanwhile, the overflow plate 20 divides the internal space of the outer casing 10 into two spaces: the mounting slot 11 and the overflow slot 12. It also allows the battery pack 30 and electrical components to be installed independently in the mounting slot 11 and the overflow slot 12, ensuring that there is no interference between the battery pack 30 and the electrical components, and ensuring the independent operation and safety of the battery pack 30 and the electrical components, thereby ensuring the operational reliability of the energy storage device.

[0043] In this embodiment, the outer casing 10 is rectangular, and the energy storage device also includes a support plate disposed on the outer casing 10 and located within the overflow trough 12. One end of the support plate is connected to the overflow trough 12 to support it. Multiple support plates are provided, spaced apart along the height of the outer casing 10. This allows the overflow plate 20 to be supported by multiple support plates, preventing it from tilting under external impact and ensuring its structural stability.

[0044] like Figure 2 and Figure 3 As shown, the end face of the inlet end 51 is parallel to the bottom surface of the outer casing 10; and / or, the height of the inlet end 51 is higher than the height of the outlet end 52 of the outlet pipe 50. This arrangement, with the end face of the inlet end 51 parallel to the bottom surface of the outer casing 10, ensures that the immersion coolant must completely submerge the inlet end 51 before flowing into it and out of the outlet pipe 50. This avoids the phenomenon where the immersion coolant does not completely fill the installation tank 11 and overflow tank 12 due to the inlet end 51 being tilted, thus ensuring the accuracy of the immersion coolant flowing out of the outlet pipe 50 and the accuracy of the operator's judgment of the immersion coolant level in the installation tank 11. Simultaneously, the arrangement of the inlet end 51 being higher than the outlet end 52 of the outlet pipe 50 facilitates the smooth discharge of liquid entering through the inlet end 51 through the outlet end 52 under gravity, improving the smoothness of the discharge and enhancing the operational safety of the energy storage device.

[0045] like Figure 3 As shown, the outlet pipe 50 includes a first pipe section 53 and a second pipe section 54 that are interconnected. The first pipe section 53 extends along the height direction of the outer casing 10, and the second pipe section 54 is arranged parallel to the bottom surface of the outer casing 10. A portion of the second pipe section 54 and the first pipe section 53 are disposed within the overflow trough 12, and the other portion of the second pipe section 54 extends outside the outer casing 10. In this way, the outlet pipe 50 is connected to the overflow trough 12 through the first pipe section 53, and the extension of the first pipe section 53 along the height direction of the outer casing 10 ensures that the submerged coolant must cover the inlet end 51 before flowing out of the outlet pipe 50, thus ensuring the accuracy of the outlet pipe 50. At the same time, the outlet pipe 50 allows the submerged coolant to flow out through the second pipe section 54, ensuring the smoothness of the outlet flow.

[0046] In this embodiment, the outer casing 10 is rectangular, and the overflow channel has a width W along its length. The distance L1 between the central axis of the second pipe section 54 and the side of the overflow channel 12 satisfies the following condition with respect to the channel width W: 0.4W ≤ L1 ≤ 0.6W. This arrangement makes the placement of the second pipe section 54 more reasonable, preventing it from being too close or too far from the overflow channel 12, which could cause the immersion coolant to flow into the inlet end 51 prematurely or completely, leading to misjudgment of the coolant level by the operator. This ensures the accuracy of the operator's adjustment of the coolant level in the energy storage device. Figure 3As shown, the top of the overflow plate 20 includes a first end face 21 and a second end face 22 connected to each other. The height of the second end face 22 is lower than the height of the first end face 21. The second end face 22 is located on the side of the first end face 21 near the outlet pipe 50, and the second end face 22 is flush with the top surface of the battery pack 30. Thus, since the second end face 22 is flush with the top surface of the battery pack 30, when the immersion coolant in the mounting groove 11 fills the mounting groove 11, flows through the first end face 21 to the overflow groove 12, and flows out from the outlet pipe 50, the flow rate of the immersion coolant out of the outlet pipe 50 is sufficient. This indicates that the immersion coolant completely fills the mounting groove 11 and the overflow groove 12, and the battery pack 30 is in a state of sufficient immersion cooling, ensuring the sufficiency of the immersion coolant in the energy storage device. When the immersion coolant passes through the first end face 21 and the second end face 22... When the coolant flows from the second end face 22 to the overflow tank 12 and out through the outlet pipe 50, the flow rate of the submerged coolant from the outlet pipe 50 decreases, indicating that the amount of submerged coolant in the mounting tank 11 is decreasing. When the submerged coolant cannot flow through the second end face 22 into the overflow tank 12 and out through the outlet pipe 50, it indicates that the submerged coolant cannot cover the battery pack 30, and the battery pack 30 is not being cooled by the submerged coolant. Workers need to inject submerged coolant into the mounting tank 11 to ensure timely injection. The above settings refine the worker's judgment and adjustment of the submerged coolant level in the mounting tank 11, improving the accuracy of the adjustment.

[0047] In this embodiment, the distances H1 between the end face of the inlet 51 and the top of the outer casing 10, H2 between the second end face 22 and the top of the outer casing 10, H3 between the first end face 21 and the top of the outer casing 10, and H4 between the top surface of the battery pack 30 and the top of the outer casing 10 satisfy the following conditions: H2=H4, H3>H1>H2. This arrangement divides the process of the submerged coolant flowing to the inlet 51 into several different scenarios, each corresponding to a different liquid level. This allows the operator to determine whether the submerged coolant has flowed past the first end face 21 or the second end face 22 by observing the flow rate of the submerged coolant in the outlet pipe 50, thus enabling timely replenishment of the submerged coolant in the mounting tank 11.

[0048] In some embodiments, the energy storage device further includes a flow detection device disposed at the outlet end 52 of the outlet pipe 50. The flow detection device is used to detect the liquid flow rate at the outlet end 52. In this way, the flow detection device disposed at the outlet end 52 of the outlet pipe 50 can monitor the overflow flow rate of the submerged coolant in real time, enabling the energy storage device to record and reflect the liquid level of the submerged coolant in the mounting tank 11 in real time. It can also determine in real time whether the battery pack 30 is fully submerged in the submerged coolant, avoiding the subjective error of manually observing the submerged coolant flow rate at the outlet end 52. This achieves an objective and quantitative judgment of the liquid output of the outlet pipe 50, improves the accuracy of the operator's judgment of the submerged coolant level of the energy storage device, and also improves the automation level of the energy storage device.

[0049] In some embodiments, the energy storage device further includes a control unit, a flow control valve, and a temperature sensor. The control unit is electrically connected to the flow detection device. The flow control valve is located at the liquid inlet of the housing 10 and is used to regulate the flow rate at the liquid inlet. The temperature sensor is used to detect the temperature of the immersion coolant within the housing 10. The control unit is configured to adjust the opening of the flow control valve based on the flow rate detected by the flow detection device and / or the temperature detected by the temperature sensor. In this way, the control unit can determine the level of the immersion coolant in the mounting tank 11 based on the detection results of the flow and temperature sensors, and control the flow control valve to inject the corresponding immersion coolant. This achieves real-time monitoring and closed-loop control of the level and temperature of the immersion coolant in the mounting tank 11, significantly improving the automation level of the energy storage device and enhancing its cooling efficiency and safety.

[0050] In some embodiments, the control unit is further configured to: compare the flow rate detected by the flow sensor with a first preset flow rate; when the flow rate detected by the flow sensor is greater than or equal to the first preset flow rate, determine that the height of the immersion coolant in the housing 10 is higher than the first end face 21, and control the flow control valve to maintain the current opening or control the flow control valve to reduce the opening; when the flow rate detected by the flow sensor is less than the first preset flow rate, adjust the opening of the flow control valve according to the flow rate detected by the flow sensor and the temperature detected by the temperature sensor. Thus, when the flow rate detected by the flow sensor is greater than or equal to the first preset flow rate, the immersion coolant in the mounting tank 11 fills the mounting tank 11, flows through the first end face 21 to the overflow tank 12, and flows out from the outlet pipe 50, indicating that the immersion coolant completely fills the mounting tank 11 and the overflow tank 12, and the battery pack 30 is in a fully immersed and cooled state. The control unit correspondingly controls the flow control valve to reduce the injection of immersion coolant into the mounting tank 11, avoiding waste of immersion coolant and improving the economy of the energy storage device. Meanwhile, when the flow rate detected by the flow detection device is less than the first preset flow rate, it indicates that the battery pack 30 in the mounting tank 11 has started to dissipate heat, and the evaporation of the immersion coolant has decreased accordingly. Therefore, the control unit controls the flow control valve to inject the corresponding immersion coolant into the mounting tank 11 according to the amount of liquid discharged from the outlet 52 and the temperature detected by the temperature detection device, so as to ensure the heat dissipation reliability of the battery pack 30 and improve the automation level of the energy storage device.

[0051] In some embodiments, the control unit is further configured to: when the flow rate detected by the flow detection element is less than a first preset flow rate and greater than 0, determine that the height of the immersion liquid inside the housing 10 and the height of the first end face 21 are within a first preset height range, and obtain the temperature of the immersion coolant; when the temperature of the immersion coolant is within a preset temperature range, control the flow control valve to maintain its current opening; when the temperature of the immersion coolant exceeds the preset temperature range, control the flow control valve to increase its opening; when the flow rate detected by the flow detection element is 0, determine that the height of the immersion liquid inside the housing 10 and the height of the second end face 22 are within a second preset height range, and control the flow control valve to increase its opening. Thus, when the flow rate detected by the flow detection device is less than the first preset flow rate but greater than 0, it indicates that the immersion coolant in the mounting tank 11 flows from the second end face 22 to the overflow tank 12 and flows out from the outlet pipe 50 through the first end face 21 and the second end face 22. This indicates that the heat dissipated by the battery pack 30 in the mounting tank 11 has increased, and the immersion coolant absorbs heat and evaporates continuously, thus the control unit determines whether the temperature in the mounting tank 11 is too high based on the temperature detected by the temperature detection device, and accordingly controls the flow control valve to increase the flow rate of the immersion coolant injected into the mounting tank 11 to ensure the heat dissipation reliability of the battery pack 30. Meanwhile, when the flow rate detected by the flow detection device is 0, it indicates that the immersion coolant in the mounting tank 11 cannot flow into the overflow tank 12 through the second end face 22 and out of the outlet pipe 50. This means that the immersion coolant cannot submerge the battery pack 30, and the battery pack 30 is not submerged and cooled by the immersion coolant. The control unit controls the flow control valve to inject immersion coolant into the mounting tank 11, ensuring the timely injection of immersion coolant and improving the intelligence and accuracy of the energy storage device in regulating the level of immersion coolant.

[0052] In some embodiments, when the flow control valve is opened wider, the control unit is further configured to: continuously acquire the temperature of the submerged coolant; and when the temperature of the submerged coolant returns to a preset temperature range, adjust the opening of the flow control valve based on a comparison between the flow rate detected by the flow sensor and a first preset flow rate. In this way, the control unit can monitor the heat dissipation of the battery pack 30 in real time by monitoring the temperature of the submerged coolant. This ensures the reliability of heat dissipation for the battery pack 30 while also allowing for timely cessation of coolant injection, thus guaranteeing the accuracy and reliability of coolant injection.

[0053] According to some embodiments of this application, another aspect of this application provides an energy storage system, including a control module, a management module, and the aforementioned energy storage device. The control module is electrically connected to the energy storage device to monitor the charging and discharging of the energy storage device, and the management module is connected to the energy storage device to collect and analyze the data of the energy storage device.

[0054] According to some embodiments of this application, another aspect of this application provides an electrical device, including the above-described energy storage device, power conversion module, user interface, and control unit. The power conversion module is connected to the energy storage device to adjust the output power of the energy storage device. The user interface provides information about the energy storage device to the user. The control unit is used to coordinate the power conversion module and the user interface.

[0055] Specifically, the immersion coolant first flows into the mounting tank 11 through the inlet. After the immersion coolant fills the entire mounting tank 11, it flows over the overflow plate 20 into the overflow tank 12 and fills the entire overflow tank 12. When the immersion coolant fills the entire interior of the outer casing 10, the battery pack 30 is in the early stage of normal operation. The temperature of the battery pack 30 is low, and the evaporation of the immersion coolant is relatively small. The immersion coolant covers the first end face 21 and flows into the outlet pipe 50 from the inlet end 51 and flows out of the outlet pipe 50 stably. At this time, the flow rate detected by the flow detection device is greater than or equal to the first preset flow rate. The control unit controls the flow control valve to reduce the injection of immersion coolant into the inlet. Subsequently, the battery pack 30 is in the middle stage of normal operation. The heat generated by the cells in the battery pack 30 begins to increase, and the submerged coolant absorbs heat and evaporates. The submerged coolant flows into the overflow tank 12 through the first end face 21 and the second end face 22, and flows into the outlet pipe 50 through the inlet end 51. The flow rate of the submerged coolant flowing out of the outlet pipe 50 decreases. At this time, the flow rate detected by the flow detection device is less than the first preset flow rate and greater than 0. The control unit controls the flow control valve to maintain or increase the injection of submerged coolant at the inlet through the temperature detected by the flow detection device and the temperature detection device. Subsequently, the battery pack 30 is in the later stage of normal operation. The heat generated by the cells in the battery pack 30 continues to increase, and the temperature continues to rise to the maximum. A large amount of submerged coolant evaporates. As evaporation proceeds, the liquid level of the submerged coolant in the mounting tank 11 gradually falls below the second end face 22. The submerged coolant cannot cross the overflow plate 20 and flow into the overflow tank 12, resulting in the flow rate of the submerged coolant flowing out of the outlet pipe 50 being 0. The control unit controls the flow control valve to increase the injection of submerged coolant into the inlet until the flow rate of the submerged coolant flowing out of the outlet pipe 50 is restored to the first preset flow rate.

[0056] As can be seen from the above description, the embodiments of the present invention achieve the following technical effects:

[0057] An overflow plate is installed inside the housing of the energy storage device to divide the housing into a mounting slot and an overflow slot. The top of the overflow plate is lower than the top of the housing. The battery pack is installed in the mounting slot, and the electrical components are installed in the overflow slot. An outlet pipe passes through the side wall of the housing, with one part of the outlet pipe located within the overflow slot and the other part extending outside the housing. The inlet end of the outlet pipe is higher than the top of the overflow plate. In this way, the overflow plate divides the internal space of the housing into two spaces: the mounting slot and the overflow slot. The immersion coolant used to cool the battery pack first fills the mounting slot, ensuring the battery pack is submerged, before flowing over the overflow plate into the overflow slot. Because the inlet end of the outlet pipe is higher than the top of the overflow plate, the immersion coolant only flows into the outlet pipe from the inlet end and out of the outlet pipe after both the mounting slot and the overflow slot are filled. Therefore, when staff observe that the coolant is flowing normally from the outlet pipe, they can determine that the entire mounting tank is filled with coolant, and the battery pack is fully submerged and cooled. Conversely, if no coolant flows from the outlet pipe, it indicates that the mounting tank is not full, and the battery pack is not receiving adequate submersion cooling. Staff can then add coolant to the mounting tank, allowing for adjustment of the coolant level and ensuring reliable cooling of the battery pack. This solves the technical problem of inconvenient coolant level adjustment in existing energy storage devices. Simultaneously, the overflow plate divides the internal space of the casing into the mounting tank and the overflow tank, allowing the battery pack and electrical components to be installed independently within these spaces. This ensures minimal interference between the battery pack and electrical components, guaranteeing their operational independence and safety, thus ensuring the operational reliability of the energy storage device.

[0058] Those skilled in the art will understand that the above embodiments are specific examples of implementing this application, and in practical applications, various changes in form and detail can be made without departing from the spirit and scope of this application. Any person skilled in the art can make various alterations and modifications without departing from the spirit and scope of this application; therefore, the scope of protection of this application should be determined by the scope defined in the claims.

Claims

1. An energy storage device, characterized in that, include: A housing (10) and an overflow plate (20), the overflow plate (20) being installed inside the housing (10) to divide the housing (10) into a mounting groove (11) and an overflow groove (12), the top of the overflow plate (20) being disposed below the top of the housing (10); A battery pack (30) and electrical components, wherein the battery pack (30) is installed in the mounting slot (11) and the electrical components are installed in the overflow slot (12); The liquid outlet pipe (50) is installed on the side wall of the outer shell (10). A part of the liquid outlet pipe (50) is installed in the overflow groove (12), and the other part of the liquid outlet pipe (50) extends out of the outer shell (10). The height of the liquid inlet end (51) of the liquid outlet pipe (50) is higher than the top of the overflow plate (20).

2. The energy storage device according to claim 1, characterized in that, The end face of the liquid inlet (51) is parallel to the bottom surface of the outer casing (10); and / or, The height of the inlet end (51) is higher than the height of the outlet end (52) of the outlet pipe (50).

3. The energy storage device according to claim 1, characterized in that, The outlet pipe (50) includes: A first pipe section (53) and a second pipe section (54) are interconnected. The first pipe section (53) extends along the height direction of the outer shell (10), and the second pipe section (54) is arranged parallel to the bottom surface of the outer shell (10). A part of the second pipe section (54) and the first pipe section (53) are disposed in the overflow groove (12), and another part of the second pipe section (54) extends out of the outer shell (10).

4. The energy storage device according to claim 1, characterized in that, The top of the overflow plate (20) includes a first end face (21) and a second end face (22) connected to each other. The height of the second end face (22) is lower than the height of the first end face (21). The second end face (22) is located on the side of the first end face (21) near the liquid outlet pipe (50). The second end face (22) is flush with the top surface of the battery pack (30).

5. The energy storage device according to claim 4, characterized in that, The energy storage device also includes: A flow detection device is installed at the outlet end (52) of the outlet pipe (50), and the flow detection device is used to detect the liquid flow rate at the outlet end (52).

6. The energy storage device according to claim 5, characterized in that, The energy storage device also includes: Control unit, which is electrically connected to the flow detection element; A flow control valve is provided at the liquid inlet of the housing (10), and the flow control valve is used to regulate the flow rate at the liquid inlet; A temperature detection element is used to detect the temperature of the immersion coolant inside the housing (10); The control unit is configured to adjust the opening of the flow control valve based on the flow rate detected by the flow sensor and / or the temperature detected by the temperature sensor.

7. The energy storage device according to claim 6, characterized in that, The control unit is also configured to: The flow rate detected by the flow detection device is compared with the first preset flow rate; When the flow rate detected by the flow detection device is greater than or equal to the first preset flow rate, it is determined that the height of the immersion coolant in the housing (10) is higher than the first end face (21), and the flow control valve is controlled to maintain the current opening degree or the flow control valve is controlled to reduce the opening degree. When the flow rate detected by the flow detection element is less than the first preset flow rate, the opening of the flow control valve is adjusted according to the flow rate detected by the flow detection element and the temperature detected by the temperature detection element.

8. The energy storage device according to claim 7, characterized in that, The control unit is also configured to: When the flow rate detected by the flow detection device is less than the first preset flow rate but greater than 0, it is determined that the height of the immersion liquid in the outer shell (10) and the height of the first end face (21) are within the first preset height range difference, and the temperature of the immersion coolant is obtained; when the temperature of the immersion coolant is within the preset temperature range, the flow control valve is controlled to maintain the current opening degree; when the temperature of the immersion coolant exceeds the preset temperature range, the flow control valve is controlled to increase the opening degree. When the flow rate detected by the flow detection device is 0, it is determined that the height of the immersion liquid in the outer shell (10) and the height of the second end face (22) are within the difference of the second preset height range, and the flow control valve is controlled to increase the opening.

9. The energy storage device according to claim 8, characterized in that, When the flow control valve is controlled to increase its opening, the control unit is further configured to: The temperature of the submerged coolant is continuously acquired. When the temperature of the submerged coolant returns to the preset temperature range, the opening of the flow control valve is adjusted according to the comparison result between the flow rate detected by the flow detection device and the first preset flow rate.

10. An energy storage system, characterized in that, The device includes a control module, a management module, and an energy storage device as described in any one of claims 1 to 9. The control module is electrically connected to the energy storage device to monitor the charging and discharging of the energy storage device, and the management module is connected to the energy storage device to collect and analyze the data of the energy storage device.

11. An electrical appliance, characterized in that, The device includes an energy storage device, a power conversion module, a user interface, and a control unit as described in any one of claims 1 to 9. The power conversion module is connected to the energy storage device to adjust the output power of the energy storage device. The user interface provides information about the energy storage device to the user. The control unit is used to coordinate the power conversion module and the user interface.

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