Battery pack, energy storage device and energy storage system

Abstract

The application provides a battery pack, an energy storage device and an energy storage system, and relates to the technical field of household energy storage systems. The battery pack comprises a box body, a cover plate and a connecting structure. The cover plate is arranged at the opening of the box body. The cover plate has a first connecting end and a second connecting end. The first connecting end is provided with a supporting shaft. The supporting shaft is rotationally connected with the box body. The connecting structure comprises a sliding buckle, a clamping flange and a guide flange. The sliding buckle is slidingly connected with the box body. The clamping flange and the guide flange are both connected with the second connecting end. The clamping flange is spaced apart from the guide flange. The sliding buckle has a clamping position that abuts against the upper surface of the clamping flange, a release position that is located at the gap between the clamping flange and the guide flange, and a jacking position that abuts against the lower surface of the guide flange and drives the cover plate to be flipped upward. The cover plate can be locked, released and jacked by the movement of the sliding buckle. The cover plate does not need to be pried when being opened. The convenience of use is improved.

Description

Technical Field

[0001] This application belongs to the technical field of residential energy storage systems, and more specifically, relates to a battery pack, energy storage device and energy storage system. Background Technology

[0002] Energy storage devices are used in power systems to store excess electrical energy and release it during peak load periods to balance power supply and demand and improve the stability of power system operation. Energy storage devices often employ a modular design, consisting of multiple stacked battery packs. Each battery pack includes a casing and battery cells built into the casing. The casing often has a split structure. For example, the casing consists of a box and a cover plate, with an opening on one side of the box. The cover plate closes to the opening and is secured with screws, facilitating the installation, removal, and maintenance of the battery cells inside the box.

[0003] The cover is typically embedded inside the opening of the enclosure, making its surface flush with the enclosure surface to facilitate the stacking and connection of multiple battery packs. When removing the cover, after removing all the screws, it is not easy for operators to directly remove the cover from the opening. They often need to use external tools to pry the cover, which is cumbersome and can easily damage the structure of the enclosure or the cover. Utility Model Content

[0004] The purpose of this application is to provide a battery pack, energy storage device, and energy storage system to solve the problem that the cover plate is difficult to remove from the housing in the prior art.

[0005] To achieve the above objectives, in a first aspect, this application provides a battery pack, comprising:

[0006] The box is hollow inside and has an opening on the top and side.

[0007] A cover plate is provided over the opening of the box body, and the cover plate has a first connecting end and a second connecting end opposite each other in the horizontal direction. The first connecting end is provided with a support shaft, and the support shaft is rotatably connected to the box body.

[0008] The connecting structure includes a sliding buckle, a locking flange, and a guide flange. The sliding buckle is slidably connected to the housing in a horizontal direction. The locking flange and the guide flange are both connected to the second connecting end. The locking flange and the guide flange are spaced apart along the sliding direction of the sliding buckle. The sliding buckle has a locking position abutting against the upper surface of the locking flange, a releasing position located in the gap between the locking flange and the guide flange, and a lifting position where the top abuts against the lower surface of the guide flange and drives the cover plate to flip upward.

[0009] In some embodiments of the first aspect, the guide flange includes a horizontal segment and an inclined segment, the inclined segment being connected to one end of the horizontal segment facing the engaging flange, and the inclined segment gradually tilting upward from the horizontal segment toward the engaging flange.

[0010] In some embodiments of the first aspect, the top of the slider is an arc-shaped surface, and the projection shape of the top of the slider on a vertical plane parallel to its sliding direction is an flared shape that gradually expands from top to bottom.

[0011] In some embodiments of the first aspect, the connection structure further includes an elastic element connected between the slide and the housing, which generates a restoring force that drives the slide to move toward the release position when the slide moves from the release position toward the jacking position.

[0012] In some embodiments of the first aspect, a limiting plate is connected to one end of the elastic member facing the sliding buckle, and a limiting portion is protruding from the inner wall of the housing, the limiting portion being located on the side of the limiting plate facing away from the elastic member; when the sliding buckle moves from the release position toward the lifting position, it can abut against the limiting plate and push the limiting plate toward the elastic member; when the elastic member pushes the sliding buckle back to the release position, the limiting plate abuts against the limiting portion.

[0013] In some embodiments of the first aspect, the inner wall of the housing is provided with a support rod, the extension direction of the support rod is parallel to the sliding direction of the sliding buckle, the sliding buckle has a sliding hole, and the support rod passes through the sliding hole;

[0014] The inner wall of the sliding hole is provided with a positioning protrusion, and the peripheral side of the support rod is provided with a first positioning groove and a second positioning groove; when the sliding buckle is in the engaged position, the positioning protrusion can elastically engage with the first positioning groove; when the sliding buckle is in the released position, the positioning protrusion elastically engages with the second positioning groove.

[0015] In some embodiments of the first aspect, the housing has a support wall near its opening, the support wall having a connecting groove; the support shaft protrudes from the end face of the cover plate facing the support wall and is rotatably inserted into the connecting groove.

[0016] In some embodiments of the first aspect, the connecting groove includes a horizontal groove and an inclined groove connected to one end of the horizontal groove, the inclined groove extending upward at one end away from the horizontal groove and forming a slot on the top surface of the housing for the support shaft to pass through.

[0017] Secondly, this application also provides an energy storage device, including a plurality of battery packs as described in the first aspect and any embodiment thereof, wherein the plurality of battery packs are stacked and connected, wherein in any two adjacent battery packs, one of the connecting surfaces is provided with a first plug-in component and the other connecting surface is provided with a second plug-in component, and the first plug-in component and the second plug-in component are plugged and unplugged along the stacking direction.

[0018] Thirdly, this application also provides an energy storage system, including an energy storage device and an inverter as described in the second aspect embodiment. The inverter is electrically connected to a plurality of battery packs in the energy storage device and is used to convert the direct current output by the energy storage device into alternating current and output it to an external load or the power grid, and / or to convert the alternating current output by the power grid into direct current and output it to the energy storage device.

[0019] The beneficial effects of the battery pack, energy storage device, and energy storage system provided in this application are as follows: Compared with the prior art, the battery pack includes a housing and a cover plate. The cover plate is rotatably connected to the housing via a support shaft and covers the opening of the housing. A connection structure is provided between the cover plate and the housing. When the sliding buckle in the connection structure is in the engaged position, the sliding buckle restricts the upper surface of the engaging flange, locking the cover plate at the opening of the housing. The sliding buckle then slides from the engaged position to the released position, separating from the engaging flange to unlock the restriction on the movement of the cover plate. As the sliding buckle continues to move from the released position to the lifted position, the top of the sliding buckle contacts the lower surface of the guide flange and pushes the guide flange upward, thereby causing the cover plate to rotate upward and open a certain distance. This creates a gap between the cover plate and the housing that facilitates user operation of the cover plate, reducing the difficulty of opening due to the cover plate being fastened at the opening. It eliminates the need for tools to pry it open, making the housing and cover plate less prone to damage and deformation, thus improving user convenience. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art 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.

[0021] Figure 1 This is a schematic diagram of the battery pack structure in an embodiment of this application;

[0022] Figure 2 This is an exploded view of the battery pack in an embodiment of this application;

[0023] Figure 3 for Figure 1 A partial sectional view along the AA direction;

[0024] Figure 4 for Figure 3 A diagram showing the state of the middle sliding latch in the released position;

[0025] Figure 5 for Figure 3 Diagram showing the state of the middle sliding buckle when it is in the raised position;

[0026] Figure 6 for Figure 2 Enlarged view of section B;

[0027] Figure 7 for Figure 1 A partial sectional view along the A'-A' direction;

[0028] Figure 8 This is a structural schematic diagram of the battery pack from the bottom view in an embodiment of this application;

[0029] Figure 9 This is an exploded view of the energy storage device in the embodiments of this application;

[0030] Figure 10 This is a schematic diagram of the energy storage system in an embodiment of this application.

[0031] The following are the labeling elements in the figure:

[0032] 10-Battery pack; 20-Base; 30-Inverter; 100-Box; 101-Positioning groove; 110-Support rod; 1101-First positioning groove; 1102-Second positioning groove; 120-Limiting part; 130-Supporting wall; 1301-Connecting groove; 140-Positioning post; 150-First connector; 160-Second connector; 200-Cover plate; 210-Supporting shaft; 300-Connecting structure; 310-Sliding buckle; 311-Positioning protrusion; 320-Engaging flange; 330-Guide flange; 331-Horizontal section; 332-Inclined section; 340-Elastic element; 350-Limiting plate; 400-Battery module. Detailed Implementation

[0033] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0034] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0035] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., 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 this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0036] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0037] Reference Figure 1 and Figure 2 This application provides a battery pack 10, including a housing 100 and a cover plate 200. The housing 100 is hollow inside and has an opening on the top side. The cover plate 200 covers the opening of the housing 100 and has a first connecting end and a second connecting end opposite each other in the horizontal direction. The first connecting end is provided with a support shaft 210. The support shaft 210 is rotatably connected to the housing 100 so that the opening of the housing 100 can be opened or closed by rotating the cover plate 200 around the support shaft 210.

[0038] The housing 100 can be a shell structure of any shape, with a hollow interior forming an installation cavity for mounting the battery module 400 of the battery pack 10. The battery module 400 may include multiple battery cells, which can be connected in series or parallel to meet different voltage and capacity requirements. The battery cells can be lithium-ion batteries, nickel-metal hydride batteries, or other types of chemical power sources. In this embodiment, the housing 100 has a cuboid structure. An opening at the top of the housing 100 is used for installing and removing the battery module 400. The shape and size of the cover plate 200 match the shape and size of the opening, and the cover plate 200 is embedded inside the opening so that its upper surface is flush with the upper surface of the housing 100, facilitating the stacking and storage of the battery pack 10. In this embodiment, the cover plate 200 is rectangular, with a first connecting end and a second connecting end at the two ends of the cover plate 200 in its width direction.

[0039] Reference Figures 3-6The battery pack 10 also includes a connecting structure 300 disposed between the second connecting end of the housing 100 and the cover 200, for locking the second connecting end onto the housing 100 to lock the cover 200 onto the housing 100. The connecting structure 300 includes a sliding buckle 310, a locking flange 320, and a guide flange 330. The sliding buckle 310 is slidably connected to the housing 100 in the horizontal direction. The locking flange 320 and the guide flange 330 are both connected to the second connecting end. The locking flange 320 and the guide flange 330 are spaced apart along the sliding direction of the sliding buckle 310. The sliding buckle 310 has a locking position abutting against the upper surface of the locking flange 320, a releasing position located in the gap between the locking flange 320 and the guide flange 330, and a lifting position where the top abuts against the lower surface of the guide flange 330 and drives the cover 200 to flip upward.

[0040] The sliding buckle 310 is a sliding component slidably connected to the housing 100. It can be manufactured using injection molding and can be slidably connected to the inner wall of the housing 100 through a groove structure, a slide rail structure, etc. In this embodiment, a support rod 110 is provided on the inner wall of the housing 100 near the second connecting end. The extension direction of the support rod 110 is parallel to the length direction of the cover plate 200. The sliding buckle 310 has a sliding hole and is slidably connected to the support rod 110 through the sliding hole, so that the sliding buckle 310 can slide along the length direction of the cover plate 200. The engaging flange 320 and the guide flange 330 are both protrusions provided on the second connecting end of the cover plate 200. The extension directions of the engaging flange 320 and the guide flange 330 are both parallel to the sliding direction of the sliding buckle 310.

[0041] Reference Figure 3 The engaging flange 320 can be a horizontally extending rectangular protrusion. The lower surface of the sliding buckle 310 is provided with a groove that matches the engaging flange 320. When the sliding buckle 310 is in the engaging position, the sliding buckle 310 moves to the engaging flange 320. The lower surface of the sliding buckle 310 at the groove can press against the upper surface of the engaging flange 320, thereby restricting the upward movement of the engaging flange 320, and thus restricting the upward rotation of the cover plate 200, locking the cover plate 200 in the closed state.

[0042] Reference Figure 4 The engaging flange 320 and the guide flange 330 are spaced apart in the sliding direction of the sliding buckle 310 (i.e., the axial direction of the support rod 110), and the distance between them is not less than the width of the sliding buckle 310. When the sliding buckle 310 slides to the release position, the sliding buckle 310 moves between the engaging flange 320 and the guide flange 330, and disengages from the constraint area of ​​the engaging flange 320. At this time, the cover plate 200 is in a free state and can be rotated upward to open.

[0043] Reference Figure 5The guide flange 330 is shaped to fit the top end face shape of the slide buckle 310. In this embodiment, the guide flange 330 includes a horizontal section 331 and an inclined section 332. The inclined section 332 is connected to the end of the horizontal section 331 facing the engaging flange 320, and the inclined section 332 gradually slopes upward from the horizontal section 331 towards the engaging flange 320. The horizontal section 331 refers to a flat structure that provides horizontal support when in contact with the slide buckle 310, and its length direction is consistent with the sliding direction of the slide buckle 310. When the cover plate 200 is in the closed state, the height of the horizontal section 331 is lower than the top of the slide buckle 310. The inclined section 332 refers to a sloping structure that is connected to the horizontal section 331 and extends upward. Specifically, it can be a curved part integrally formed with the horizontal section 331, and its inclination angle range can be 25° to 50°. When the cover plate 200 is in the closed state, the highest point of the inclined section 332 is higher than the top of the slide buckle 310. The function of the inclined section 332 is to convert the horizontal sliding of the slide buckle 310 into the flipping driving force of the cover plate 200, and to reduce the contact resistance between the slide buckle 310 and the guide flange 330 through the inclined guide.

[0044] When the sliding buckle 310 slides to the lifted position, its top tip first contacts the inclined section 332 of the guide flange 330. Under the guidance of the inclined surface, the entire cover plate 200 gradually moves upward until the sliding buckle 310 moves to the horizontal section 331. At this point, it pushes the cover plate 200 upward a certain distance, lifting the second connecting end of the cover plate 200. A gap is formed between the second connecting end of the cover plate 200 and the housing 100, providing a natural point of force application for the user and preventing damage or deformation to the housing 100 or the cover plate 200 caused by forced prying. The junction of the horizontal section 331 and the inclined section 332 forms a continuous transition guide surface, preventing jamming caused by abrupt changes in the path during the movement of the sliding buckle 310. The slope design of the inclined section 332 can adjust the horizontal thrust required for the sliding buckle 310 to lift the cover plate 200. For example, a smaller tilt angle reduces the operating force, while a larger tilt angle shortens the stroke of the sliding buckle 310.

[0045] In actual operation, the sliding latch 310 is first pushed directly from the engaged position to the lifted position. This unlocks the cover 200 and simultaneously lifts the second connecting end of the cover 200 upwards a certain distance, creating a gap between the cover 200 and the housing 100, making it easier for the user to open the cover 200. Then, the sliding latch 310 is moved in the opposite direction from the lifted position to the released position. When the user replaces the cover 200 on the opening, the released latch 310 will not interfere with the return of the cover 200. Pushing the latch 310 again in the opposite direction moves it back to the engaged position to lock the cover 200. By sliding the latch 310 in one direction, the functions of locking, releasing, and lifting the cover 200 can be achieved without the need for tools, minimizing the risk of damage or deformation to the housing 100 or the cover 200, thus improving user convenience.

[0046] Furthermore, the top of the slider 310 is arc-shaped, and the projection shape of the top of the slider 310 on a vertical plane parallel to its sliding direction is an everted shape that gradually expands from top to bottom. For example, the top surface of the slider 310 can be an arc surface, a spherical surface, or an ellipsoidal surface, so that the contact area between the slider 310 and the guide flange 330 forms a continuous and smooth transition during the sliding process, reducing the jamming or sudden change in frictional resistance caused by the relative movement of the slider 310 and the guide flange 330. It also avoids component wear or deformation caused by local stress concentration, improving the smoothness of the opening operation of the cover 200 and the structural reliability.

[0047] In some embodiments, the connection structure 300 further includes an elastic element 340 connected between the slide buckle 310 and the housing 100, which generates a restoring force that drives the slide buckle 310 to move toward the release position when the slide buckle 310 moves from the release position toward the jacking position.

[0048] The elastic element 340 can be a spring, sheet, or elastic rubber, or other component capable of storing mechanical energy through deformation, and undergoes elastic deformation during the sliding of the latch 310. In this embodiment, the elastic element 340 is a helical spring sleeved on the support rod 110. The elastic element 340 is located on the side of the latch 310 opposite to the engaging flange 320, with one end fixed to the inner wall of the housing 100 and the other end abutting against the latch 310, so that the elastic element 340 can be compressed to store energy when the latch 310 moves to the raised position. The restoring force refers to the reverse force generated by the deformation of the elastic element 340 during the displacement of the latch 310. When the latch 310 moves to the raised position, the deformation of the elastic element 340 reaches its maximum, thereby driving the latch 310 to slide in the opposite direction.

[0049] Specifically, when the sliding latch 310 is pushed to the raised position by an external force, the elastic element 340 undergoes compression or stretching deformation due to the displacement of the sliding latch 310. At this time, the elastic potential energy stored inside the elastic element 340 causes the sliding latch 310 to automatically spring back to the release position. After the sliding latch 310 completes the lifting operation of the cover plate 200 in the raised position, the operator does not need to manually operate the sliding latch 310 to reset. The reset force of the elastic element 340 directly acts on the sliding direction of the sliding latch 310, causing it to automatically return to the release position. This makes it convenient for the user to close the cover plate 200 back onto the housing 100, improving the continuity of the opening and closing operation of the cover plate 200.

[0050] Furthermore, the end of the elastic member 340 facing the sliding buckle 310 is connected to a limiting plate 350, and the inner wall of the housing 100 is provided with a limiting part 120, which is located on the side of the limiting plate facing away from the elastic member 340. When the sliding buckle 310 moves from the release position to the lifting position, it can abut against the limiting plate 350 and push the limiting plate 350 to move towards the elastic member 340. When the elastic member 340 pushes the sliding buckle 310 back to the release position, the limiting plate 350 abuts against the limiting part 120.

[0051] The limiting plate 350 refers to a rigid plate-like structure disposed at the end of the elastic element 340, which can be a metal stamping part or an injection molded part, used to transmit the force of the elastic element 340 and form a moving constraint boundary. The limiting part 120 refers to a protruding structure disposed on the inner wall of the housing 100, which can be a welded boss or an integrally formed reinforcing rib, used to form a mechanical hard contact with the limiting plate 350 to limit the displacement range. The limiting plate 350 refers to a moving part connected to the sliding buckle 310, which can be made of aluminum alloy sheet, and its sliding direction is parallel to the moving trajectory of the sliding buckle 310.

[0052] Specifically, when the sliding buckle 310 moves from the release position to the lifting position under the action of an external force, the limiting plate 350 moves synchronously with the sliding buckle 310 and contacts the limiting part 120 on the inner wall of the housing 100. At this time, the limiting plate 350 generates a reaction force due to the obstruction of the limiting part 120, forcing the limiting plate to compress the elastic element 340 and generate energy storage deformation. When the external force is removed, the elastic element 340 releases the stored energy and pushes the sliding buckle 310 to move in the opposite direction. At this time, the limiting plate 350 continues to move under the push of the elastic element 340 until it contacts the limiting part 120. At this time, the rigid contact between the limiting plate 350 and the limiting part 120 forms a mechanical stop, ensuring that the sliding buckle 310 is accurately reset to the release position and preventing it from moving below the engaging flange 320 due to excessive elastic force, thus affecting the closing action of the cover plate 200.

[0053] Furthermore, when the sliding buckle 310 is slidably connected to the inner wall of the housing 100 via the support rod 110, a positioning protrusion 311 may be provided on the inner wall of the sliding hole, and a first positioning groove 1101 and a second positioning groove 1102 are provided on the circumferential side of the support rod; when the sliding buckle 310 is in the engaged position, the positioning protrusion 311 can be elastically engaged in the first positioning groove 1101; when the sliding buckle 310 is in the released position, the positioning protrusion 311 is elastically engaged in the second positioning groove 1102.

[0054] The positioning protrusion 311 refers to an elastic protrusion set on the inner wall of the sliding hole. Its shape can be hemispherical, cylindrical, or conical, etc., and it is used to cooperate with the positioning groove on the support rod 110 to realize the positioning of the sliding buckle 310 in a specific position. The first positioning groove 1101 and the second positioning groove 1102 are both groove structures formed on the circumferential side of the support rod 110. They are spaced apart in the axial direction of the support rod 110 and are used to accommodate the positioning protrusion 311 to realize the positioning function of the sliding buckle 310. When the sliding buckle 310 slides on the support rod 110, the positioning protrusion 311 is squeezed by the support rod 110 and undergoes elastic deformation until the sliding buckle 310 moves to the engaging position. At this time, the position of the positioning protrusion 311 corresponds to the position of the first positioning groove 1101, and the positioning protrusion 311 elastically returns to the first positioning groove 1101. At this time, the sliding buckle 310 cannot move on its own, ensuring the stability of the engaging state. Similarly, when the sliding buckle 310 is pushed to the release position, the positioning protrusion 311 disengages from the first positioning groove 1101 and slides across the surface of the support rod 110. Upon reaching the second positioning groove 1102, it engages again, achieving a limiting position in the middle. Furthermore, when the sliding buckle 310 is pushed from the raised position to the release position using the elastic member 340, the cooperation of the positioning protrusion 311 and the second positioning groove 1102 ensures the accurate reset of the sliding buckle 310. During this process, the elastic engagement of the positioning protrusion 311 with the first positioning groove 1101 and the second positioning groove 1102 provides clear tactile feedback, allowing the operator to perceive whether the sliding buckle 310 is in position.

[0055] It is understood that a groove may be provided on the surface of the housing 100 facing the user operation side. The groove corresponds to the setting position of the sliding buckle 310 and passes through the housing 100. Part of the sliding buckle 310 extends to the outside of the housing 100 through the groove to facilitate the user operation of the sliding buckle 310.

[0056] Reference Figure 7 In some embodiments, the housing 100 has a support wall 130 near its opening, the support wall 130 having a connecting groove 1301; the support shaft 210 protrudes from the end face of the cover plate 200 facing the support wall 130 and is rotatably inserted into the connecting groove 1301.

[0057] The support wall 130 refers to the supporting structure extending inward from the opening edge of the housing 100. Specifically, it can be formed by welding a metal plate to the opening edge of the housing 100 or by bending the opening edge of the housing 100 inward. It provides mechanical support for the support shaft 210 and limits the rotation trajectory of the cover plate 200. The connecting groove 1301 is a through groove opened in the horizontal direction, which allows the support shaft 210 to rotate freely in the groove to realize the relative rotation between the cover plate 200 and the housing 100.

[0058] The connecting groove 1301 may include a horizontal groove and an inclined groove connected to one end of the horizontal groove. The inclined groove extends upward at the end opposite to the horizontal groove and forms a slot on the top surface of the housing 100 through which the support shaft 210 can pass.

[0059] A horizontal groove is a straight channel extending along the opening plane of the housing 100, stabilizing the position of the support shaft 210 when it is within the horizontal groove and enabling it to maintain relative rotation with respect to the housing 100. An inclined groove is a guide channel connected at an angle to the horizontal groove, used to drive the support shaft 210 to move along an inclined path to lift the cover plate 200. A slot is an opening structure located on the top surface of the housing 100 and communicating with the end of the inclined groove, allowing the support shaft 210 to disengage from the connecting slot to complete the removal of the cover plate 200.

[0060] When the support shaft 210 is in the horizontal groove, the user can operate the cover plate 200 to rotate around the axis of the support shaft 210, thereby opening or closing the cover plate 200. The user can also move the support shaft 210 along the horizontal and inclined grooves, and remove the support shaft 210 directly upward through the slot of the inclined groove, thereby separating the cover plate 200 from the housing 100, which facilitates the user's maintenance and operation of the inside of the housing 100.

[0061] Reference Figure 8 and Figure 9 Secondly, this application provides an energy storage device, including a plurality of battery packs 10 as in the first aspect embodiment, wherein the plurality of battery packs 10 are stacked and connected, wherein in any two adjacent battery packs 10, one of the two connecting surfaces is provided with a first plug-in component and the other connecting surface is provided with a second plug-in component, and the first plug-in component and the second plug-in component are plugged and unplugged together along the stacking direction.

[0062] Stacked connection refers to the sequential arrangement of multiple battery packs 10 in a vertical or horizontal direction. In this embodiment, multiple battery packs 10 are stacked and connected in a vertical direction. The connection surface refers to the upper and lower surfaces of the battery pack 10, that is, the first plug-in component and the second plug-in component are respectively disposed on the upper and lower surfaces of the battery pack 10.

[0063] The first and second plug-in components refer to mechanical connecting elements with complementary shapes, such as male and female plugs, snap-fit ​​mechanisms, or guide rail groove structures. Specifically, they can be implemented using mortise and tenon structures or elastic snap-fit ​​mechanisms, forming physical constraints through plug-in mating. In this embodiment, the first plug-in component includes a positioning post 140 and a first connector 150 protruding from the upper surface of the housing 100, and the second plug-in component includes a positioning groove 101 and a second connector 160 disposed on the lower surface of the housing 100. Multiple positioning posts 140 and positioning grooves 101 are provided and evenly distributed around the periphery of the housing 100. The first connector 150 and the second connector 160 are matched and electrically connected to the battery module 400 inside the housing 100.

[0064] When assembling the energy storage device, multiple battery packs 10 are stacked sequentially along a preset direction. The positioning of two adjacent battery packs 10 is achieved by inserting the positioning post 140 into the corresponding positioning slot 101. At the same time, the first connector 150 and the second connector 160 are plugged in to connect the battery modules 400 in the upper and lower battery packs 10 in series.

[0065] The positioning posts 140 and positioning slots 101 not only enable rapid positioning and installation of the battery packs 10, but also restrict the relative movement of the battery packs 10 in the stacking direction, enhancing the stability of the stacking structure. The insertion method of the first connector 150 and the second connector 160 is simple and reliable, ensuring the accuracy and stability of the electrical connection between the battery modules 400 and reducing the risk of failure due to poor contact.

[0066] In addition, the energy storage device may also include a base 20 for supporting the stacked battery pack 10, ensuring the stability of the entire energy storage device. The shape and size of the base 20 are matched to the bottom of the battery pack 10 to provide a uniform support surface.

[0067] In this embodiment, the upper surface of the base 20 is also provided with a first plug-in component (e.g., positioning post 140) that matches the second plug-in component on the lower surface of the battery pack 10, so that the bottommost battery pack 10 can be quickly connected to the base 20. In addition, the bottom of the base 20 may be provided with a fixing structure, such as mounting holes or mounting slots, so as to fix the energy storage device in a predetermined position, such as the ground, wall or inside the equipment.

[0068] Reference Figure 10 Thirdly, embodiments of this application also provide an energy storage system, including an energy storage device and an inverter 30 as described in the second aspect embodiment. Multiple battery packs 10 in the energy storage device are electrically connected, and the inverter 30 is electrically connected to the energy storage device for converting the DC power output by the energy storage device into AC power and outputting it to an external load or the power grid, and / or converting the AC power output from the power grid into DC power and outputting it to the energy storage device.

[0069] The energy storage device is an energy storage unit formed by electrically connecting multiple battery packs 10. The energy storage capacity can be flexibly adjusted by changing the number of battery packs 10 to adapt to different scenario requirements. The inverter 30 is a power electronic device that realizes the mutual conversion between DC and AC power. Specifically, it can be implemented using a bidirectional converter topology, and completes the bidirectional conversion of electrical energy by controlling the on and off states of power devices such as IGBTs or MOSFETs. The inverter 30 can be stacked on top of the energy storage device. Specifically, the lower surface of the inverter 30 can also be provided with a second plug-in component (e.g., positioning slot 101 or second connector 160) that matches the first plug-in component, so that after the inverter 30 is stacked on top of the uppermost battery pack 10 in the energy storage device, the second plug-in component can cooperate with the first plug-in component of the battery pack 10 for positioning and circuit conduction.

[0070] Electrical connection refers to the circuit continuity between battery packs 10 and between battery pack 10 and inverter 30. Specifically, copper busbars, cables, or connectors can be used to achieve a low-impedance path, ensuring efficient power transmission. When power needs to be supplied to an external load or the grid, the DC power output from the energy storage device is converted to AC power by inverter 30 and output through the grid interface. When charging the energy storage device, the AC power input from the grid is converted to DC power by inverter 30, and the battery management system controls the charging of battery packs 10. This allows for the storage of electrical energy when there is a surplus of grid power and the release of electrical energy when there is a shortage of grid power, achieving energy balance between the grid and the energy storage device.

[0071] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery pack, characterized in that, include: The box is hollow inside and has an opening on the top and side. A cover plate is provided over the opening of the box body, and the cover plate has a first connecting end and a second connecting end opposite each other in the horizontal direction. The first connecting end is provided with a support shaft, and the support shaft is rotatably connected to the box body. The connecting structure includes a sliding buckle, a locking flange, and a guide flange. The sliding buckle is slidably connected to the housing in a horizontal direction. The locking flange and the guide flange are both connected to the second connecting end. The locking flange and the guide flange are spaced apart along the sliding direction of the sliding buckle. The sliding buckle has a locking position abutting against the upper surface of the locking flange, a releasing position located in the gap between the locking flange and the guide flange, and a lifting position where the top abuts against the lower surface of the guide flange and drives the cover plate to flip upward.

2. The battery pack according to claim 1, characterized in that, The guide flange includes a horizontal section and an inclined section. The inclined section is connected to one end of the horizontal section facing the engaging flange, and the inclined section gradually slopes upward from the horizontal section towards the engaging flange.

3. The battery pack according to claim 2, characterized in that, The top of the slider is arc-shaped, and the projection shape of the top of the slider on a vertical plane parallel to its sliding direction is an flared shape that gradually expands from top to bottom.

4. The battery pack according to any one of claims 1-3, characterized in that, The connection structure also includes an elastic element connected between the sliding buckle and the housing, which generates a restoring force that drives the sliding buckle to move toward the release position when the sliding buckle moves from the release position toward the jacking position.

5. The battery pack according to claim 4, characterized in that, One end of the elastic element facing the sliding buckle is connected to a limiting plate, and the inner wall of the housing is provided with a limiting part, which is located on the side of the limiting plate facing away from the elastic element. When the sliding buckle moves from the release position to the lifting position, it can abut against the limiting plate and push the limiting plate to move towards the elastic element. When the elastic element pushes the sliding buckle back to the release position, the limiting plate abuts against the limiting part.

6. The battery pack according to claim 5, characterized in that, The inner wall of the box is provided with a support rod, the extension direction of the support rod is parallel to the sliding direction of the sliding buckle, the sliding buckle has a sliding hole, and the support rod passes through the sliding hole; The inner wall of the sliding hole is provided with a positioning protrusion, and the peripheral side of the support rod is provided with a first positioning groove and a second positioning groove; when the sliding buckle is in the engaged position, the positioning protrusion can elastically engage with the first positioning groove; when the sliding buckle is in the released position, the positioning protrusion elastically engages with the second positioning groove.

7. The battery pack according to any one of claims 1-3, characterized in that, The housing has a support wall near its opening, and the support wall has a connecting groove; the support shaft protrudes from the end face of the cover plate facing the support wall and is rotatably inserted into the connecting groove.

8. The battery pack according to claim 7, characterized in that, The connecting groove includes a horizontal groove and an inclined groove connected to one end of the horizontal groove. The inclined groove extends upward at one end away from the horizontal groove and forms a slot on the top surface of the box through which the support shaft can pass.

9. An energy storage device, characterized in that, The device includes multiple battery packs as described in any one of claims 1-8, the multiple battery packs being stacked and connected, wherein in any two adjacent battery packs, one of the two connecting surfaces is provided with a first plug-in component, and the other connecting surface is provided with a second plug-in component, the first plug-in component and the second plug-in component being plugged and unplugged along the stacking direction.

10. An energy storage system, characterized in that, The device includes an energy storage device and an inverter as described in any one of claims 1-9, wherein the inverter is electrically connected to a plurality of battery packs in the energy storage device, and is used to convert the direct current output by the energy storage device into alternating current and output it to an external load or the power grid, and / or to convert the alternating current output from the power grid into direct current and output it to the energy storage device.

Images