Energy storage device and energy storage system

Abstract

The application provides an energy storage device and an energy storage system, and belongs to the technical field of household energy storage systems. The energy storage device comprises a plurality of stacked and connected battery packs. One of the two connecting surfaces of any two adjacent battery packs is provided with a positioning column, and the other connecting surface is provided with a positioning groove and an elastic buckle. The elastic buckle is provided on the inner wall surface of the positioning groove in the circumferential direction. The circumferential side of the positioning column is provided with a lock groove. The positioning column is connected to the positioning groove in a plug-in manner. When the positioning column moves in the positioning groove, the elastic buckle can be elastically deformed in the direction opposite to the positioning column. When the lock groove and the elastic buckle are in position, the elastic buckle can be elastically reset and inserted into the lock groove. The positioning column and the positioning groove are matched to position the two adjacent battery packs. The elastic buckle and the lock groove are matched to further lock the positioning column, so that the battery packs are not easy to loosen, and the performance and safety of the energy storage device are improved.

Description

Technical Field

[0001] This application belongs to the technical field of residential energy storage systems, and more specifically, relates to an energy storage device and an 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. Currently, energy storage devices used in residential applications often employ a modular design, consisting of multiple stacked battery packs. To ensure precise connection and positioning of the battery packs during stacking, each battery pack has positioning posts and positioning holes on its upper and lower surfaces. By inserting the posts into the positioning holes, precise positioning of the relative positions between the battery packs is achieved.

[0003] However, in practical applications, since the positioning posts and positioning holes mostly use clearance fit, there is a risk of loosening between two adjacent battery packs. Especially when no other fixing method is used, loose connection between battery packs can easily cause problems such as poor contact of the connection lines, affecting the performance and safety of the energy storage device. Utility Model Content

[0004] The purpose of this application is to provide an energy storage device and energy storage system to solve the problem of loosening risk in the stacked connection of battery packs in the prior art.

[0005] To achieve the above objectives, in a first aspect, this application provides an energy storage device, including a plurality of stacked battery packs, wherein in any two adjacent battery packs, one of the connecting surfaces is provided with a positioning post, and the other connecting surface is provided with a positioning groove and an elastic buckle.

[0006] The elastic buckle protrudes from the inner wall of the positioning groove in the circumferential direction. The positioning post has a locking groove on its circumferential side. The positioning post is inserted into the positioning groove. When the positioning post moves in the positioning groove, it can squeeze the elastic buckle to make it elastically deform in the direction away from the positioning post. When the locking groove and the elastic buckle are in the same position, the elastic buckle can elastically reset and be inserted into the locking groove.

[0007] In some embodiments of the first aspect, the battery pack is provided with a slide, the slide extending perpendicular to the extending direction of the positioning groove, and the slide having a first end facing the positioning groove and a second end facing away from the positioning groove; the resilient buckle includes:

[0008] A locking element is slidably connected to the slide rail. One end of the locking element protrudes from the inner wall of the circumferential side of the positioning groove and slides toward the second end when subjected to the squeezing force of the positioning post.

[0009] An elastic element, connected between the locking member and the battery pack, generates a restoring force toward the first end when the locking member slides toward the second end, so as to drive the locking member to slide toward the first end and insert into the locking groove when the locking groove corresponds to the position of the locking member.

[0010] In some embodiments of the first aspect, the projection shape of the end of the locking member facing away from the second end in a plane parallel to the extension direction of the slide is an flared shape that gradually expands toward the second end.

[0011] In some embodiments of the first aspect, the end surface of the locking member facing away from the second end is configured as a spherical surface that protrudes away from the second end.

[0012] In some embodiments of the first aspect, the slide rail includes a guide section and a limiting section, the guide section communicating between the positioning groove and the limiting section, and the inner diameter of the guide section being smaller than the inner diameter of the limiting section; the locking member includes a sliding part and a limiting part protruding from the periphery of the sliding part, the sliding part being slidably disposed within the guide section, and the limiting part being slidably disposed within the limiting section, thereby limiting the sliding range of the locking member within the slide rail.

[0013] In some embodiments of the first aspect, the locking member has a fixing hole on the side facing the second end, the second end of the slide rail has a fixing post protruding towards the locking member, one end of the elastic member is installed in the fixing hole, and the other end is arranged around the periphery of the fixing post.

[0014] In some embodiments of the first aspect, the battery pack has a mounting groove and a cover plate on the connecting surface where the positioning groove is provided, the extension direction of the mounting groove is perpendicular to the extension direction of the positioning groove; the cover plate covers the opening of the mounting groove, the cover plate has a first groove on the side facing the mounting groove, and the mounting groove has a second groove on the inner wall surface facing the cover plate, the first groove and the second groove surround to form the slide.

[0015] In some embodiments of the first aspect, at least one connecting buckle is provided on the periphery of the cover plate, and at least one connecting groove is provided on the inner periphery of the mounting groove, wherein the connecting buckle is elastically engaged in the connecting groove.

[0016] In some embodiments of the first aspect, the energy storage device further includes a base on which a plurality of the battery packs are stacked.

[0017] Secondly, this application also provides an energy storage system, including an energy storage device and an inverter as described in the first aspect and its embodiments, 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 by the power grid into direct current and output it to the energy storage device.

[0018] The beneficial effects of the energy storage device and energy storage system provided in this application are as follows: Compared with the prior art, the two opposite surfaces of the battery pack are respectively provided with positioning posts and positioning slots, and the positioning slots are provided with elastic buckles. During the stacking and connection of multiple battery packs, the positioning posts are inserted into the positioning slots to limit the relative positions of two adjacent battery packs. During the insertion of the positioning posts into the positioning slots, the positioning posts squeeze the elastic buckles to make them elastically deform. When the locking slots on the positioning posts correspond to the positions of the elastic buckles, the elastic buckles elastically reset and are inserted into the locking slots to achieve structural locking, making it difficult for the battery packs to loosen, thereby improving the performance and safety of the energy storage device. Attached Figure Description

[0019] 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.

[0020] Figure 1 This is a front view of the energy storage device in an embodiment of this application;

[0021] Figure 2 This is an exploded view of the battery pack in an embodiment of this application;

[0022] Figure 3 Figure 1 A partial sectional view along the AA direction;

[0023] Figure 4 yes Figure 3 A partial sectional view of the positioning pin in and out of the positioning slot;

[0024] Figure 5 for Figure 2 Enlarged view of section B;

[0025] Figure 6 This is an exploded view of the battery pack from another perspective in an embodiment of this application;

[0026] Figure 7 for Figure 6 Enlarged view of section C;

[0027] Figure 8This is an exploded view of the energy storage device in the embodiments of this application;

[0028] Figure 9 This is a schematic diagram of the energy storage system in an embodiment of this application.

[0029] The following are the labeling elements in the figure:

[0030] 100-Battery pack; 100a-Box; 110b-Top plate; 100c-Battery module; 101-Positioning groove; 102-Slide rail; 102a-Guide section; 102b-Limiting section; 103-Mounting groove; 1031-Second groove; 1032-Connecting groove; 110-Cover plate; 111-Connecting buckle; 1101-First groove; 120-Fixing post; 200-Positioning post; 201-Lock groove; 300-Elastic buckle; 310-Lock fastener; 3101-Fixing hole; 320-Elastic element; 400-Base; 500-Inverter. Detailed Implementation

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] In a first aspect, embodiments of this application provide an energy storage device, referring to... Figure 1 The energy storage device includes multiple stacked battery packs 100. Each battery pack 100 is a component used to store or output electrical energy, and its structure can be arbitrary. Stacking refers to the sequential arrangement of multiple battery packs 100 in a vertical or horizontal direction; in this embodiment, the battery packs 100 are stacked vertically.

[0036] Reference Figure 2 In one example, the battery pack 100 may include a housing 100a, a top plate 100b, and a battery module 100c. The housing 100a can be a shell structure of any shape, with a hollow interior forming an installation cavity. The top or other side of the housing 100a has an opening. The top plate 100b is movably connected to the opening of the housing 100a to close the installation cavity. In this embodiment, the housing 100a is a cuboid structure, and the top plate 100b is rectangular. The battery module 100c is installed inside the installation cavity for storing and outputting electrical energy. The battery module 100c may include multiple battery cells, which can be connected in series or parallel to meet different voltage and capacity requirements. The battery cells may be lithium-ion batteries, nickel-metal hydride batteries, or other types of chemical power sources.

[0037] Reference Figure 3 , Figure 4 and Figure 5 In a plurality of stacked battery packs 100, one of the connecting surfaces of any two adjacent battery packs 100 is provided with a positioning post 200, and the other connecting surface is provided with a positioning groove 101 and an elastic buckle 300. The elastic buckle 300 protrudes from the inner wall of the positioning groove 101 in the circumferential direction. The circumferential side of the positioning post 200 is provided with a locking groove 201. The positioning post 200 is inserted into the positioning groove 101. When the positioning post 200 moves in the positioning groove 101, it can squeeze the elastic buckle 300 to make it elastically deform in the direction away from the positioning post 200. When the locking groove 201 and the elastic buckle 300 are aligned, the elastic buckle 300 can elastically reset and be inserted into the locking groove 201.

[0038] In this embodiment, multiple battery packs 100 are stacked and connected vertically, with the connecting surfaces being the upper and lower surfaces of the battery packs 100. Positioning posts 200 and positioning grooves 101 are respectively disposed on the upper and lower surfaces of the battery packs 100. Specifically, in one example, the positioning post 200 protrudes from the upper surface of the battery pack 100, while the positioning groove 101 and elastic buckle 300 are both disposed on the lower surface of the battery pack 100. In another example, the positioning post 200 may protrude from the lower surface of the battery pack 100, while the positioning groove 101 and elastic buckle 300 are both disposed on the upper surface of the battery pack 100. This embodiment uses the example of a positioning post 200 protruding from the upper surface of the battery pack 100 and the positioning groove 101 and elastic buckle 300 disposed on the lower surface of the battery pack 100 for further explanation.

[0039] The positioning post 200 is a columnar protrusion extending perpendicularly to the connecting surface of the battery pack 100. It can be a cylindrical or polygonal prism structure and is used to insert into the positioning groove 101 for initial alignment. In this embodiment, the positioning post 200 is a rectangular columnar protrusion structure with a chamfered top to facilitate insertion into the positioning groove 101. The positioning groove 101 is a recessed structure that matches the shape of the positioning post 200, with a depth not less than the length of the positioning post 200, used to completely accommodate the positioning post 200. The elastic buckle 300 is a locking component with elastic deformation capability, such as an elastic metal sheet, elastic rubber, or an elastic protrusion elastically connected to the inner wall of the positioning groove 101. The elastic buckle 300 is located circumferentially on the inner wall of the positioning groove 101 to generate radial locking force. The locking groove 201 is a partially recessed structure opened along the radial direction of the positioning post 200, and its shape and depth can be adapted to the shape of the elastic buckle 300, so that the elastic buckle 300 can be inserted radially into the locking groove 201.

[0040] Each battery pack 100 may have multiple positioning posts 200 and positioning slots 101. In this embodiment, each battery pack 100 is provided with four positioning posts 200 and four positioning slots 101, which are located at the four corners of the battery pack 100 respectively. Each positioning post 200 is provided with a locking slot 201, and each positioning slot 101 is provided with an elastic buckle 300 to improve the accuracy of the positioning connection between battery packs 100.

[0041] When two battery packs 100 are stacked and assembled, the positioning post 200 is inserted into the corresponding positioning slot 101. During the insertion process, the outer surface of the positioning post 200 contacts the elastic buckle 300, generating radial compressive force, which forces the elastic buckle 300 to deform in the direction away from the positioning post 200. At this time, the elastic buckle 300 is in an energy storage deformation state until the positioning post 200 is fully inserted into the position. The locking slot 201 moves to the position aligned with the elastic buckle 300. After the elastic buckle 300 loses its external force constraint, it elastically resets, and its end is embedded in the locking slot 201 to form an interlock. When disassembling the battery pack 100, only a large force needs to be applied to make the positioning post 200 re-compress the elastic buckle 300 to deform and disengage from the locking slot 201, and the battery pack 100 can be removed. This not only meets the need for rapid disassembly and assembly of energy storage devices, but also improves the connection stability of the positioning post 200 after it is inserted into the positioning slot 101 by utilizing the elastic buckle 300.

[0042] In some embodiments, the battery pack 100 is provided with a slide 102, the extension direction of the slide 102 being perpendicular to the extension direction of the positioning groove 101, and the slide 102 having a first end facing the positioning groove 101 and a second end facing away from the positioning groove 101. The elastic buckle 300 may include a locking member 310 and an elastic member 320. The locking member 310 is slidably connected to the slide 102, one end of the locking member 310 protruding from the peripheral inner wall of the positioning groove 101, and sliding towards the second end when subjected to the pressing force of the positioning post 200; the elastic member 320 is connected between the locking member 310 and the battery pack 100, and generates a restoring force towards the first end when the locking member 310 slides towards the second end, so as to drive the locking member 310 to slide towards the first end and insert into the locking groove 201 when the locking groove 201 corresponds to the locking member 310.

[0043] The slide 102 is a channel structure located at the bottom of the battery pack 100. Specifically, it can be a straight groove or a straight guide rail structure, with its extension direction perpendicular to the axis of the positioning groove 101, used to constrain the sliding path of the locking member 310. The first end and the second end are the two extension ends of the slide 102, with the first end facing the positioning groove 101 and the second end facing away from the positioning groove 101. In this embodiment, the slide 102 is a straight cavity formed at the bottom of the battery pack 100, with its end facing the positioning groove 101 and connected to it. The interior of the slide 102 is used to install the locking member 310 and the elastic member 320, and to guide the movement of the locking member 310.

[0044] The locking element 310 is a block structure that is slidably connected inside the slide rail 102. Its shape is adapted to the shape of the slide rail 102, and the shape of the end surface of the locking element 310 facing the positioning post 200 is adapted to the shape of the locking groove 201. In this embodiment, both the locking element 310 and the slide rail 102 are cylindrical structures.

[0045] Furthermore, the slide 102 includes a guide section 102a and a limiting section 102b. The guide section 102a connects the positioning groove 101 and the limiting section 102b, and the inner diameter of the guide section 102a is smaller than the inner diameter of the limiting section 102b. The locking member 310 includes a sliding part and a limiting part protruding from the periphery of the sliding part. The sliding part is slidably disposed within the guide section 102a, and the limiting part is slidably disposed within the limiting section 102b, thereby limiting the sliding range of the locking member 310 within the slide 102.

[0046] The guide section 102a is the part of the slide 102 near the positioning groove 101 with a smaller inner diameter. Specifically, it can be a cylindrical channel structure, and its inner diameter matches the outer diameter of the sliding part. It is used to constrain the sliding part to move in a straight line. The length of the sliding part is greater than the length of the guide section 102a, so that the end of the sliding part facing the positioning post 200 can protrude out of the slide 102. The limiting section 102b is the part of the slide 102 away from the positioning groove 101 with a larger inner diameter. Its inner diameter matches the outer diameter of the limiting part. Since the outer diameter of the limiting part is greater than the outer diameter of the sliding part, when the locking member 310 slides towards the positioning post 200, the limiting part can abut against the step between the guide section 102a and the limiting section 102b, so as to limit the length of the sliding part protruding out of the slide 102 and prevent the locking member 310 from being dislodged from the slide 102 due to excessive elastic force from the elastic member 320.

[0047] The locking element 310, with its end facing away from the second end projected onto a plane parallel to the extension direction of the slide rail 102, has a flared shape that gradually expands towards the second end. Specifically, it can employ an arc-shaped, trapezoidal, or wedge-shaped inclined surface structure protruding towards the positioning post 200. Its arc-shaped plate or inclined surface can provide a sliding guide effect when in contact with the positioning post 200. When the positioning post 200 is inserted into the positioning groove 101, its peripheral surface gradually contacts the end surface of the locking element 310 protruding from the slide rail 102 along the insertion direction. The arc-shaped or inclined surface of the flared end converts the axial pressure applied by the positioning post 200 into a radial component force along the extension direction of the slide rail 102, forcing the locking element 310 to slide towards the second end of the slide rail 102.

[0048] In one example, the end surface of the locking member 310 facing away from the second end is configured as a spherical surface that protrudes outward from the second end. A spherical surface refers to an outwardly convex arc-shaped curved surface on the end surface of the locking member 310. When the locking member 310 contacts the positioning post 200, the curved surface reduces local frictional resistance, and the dynamic guiding characteristics of the spherical surface guide the positioning post 200 into the locking groove 201. When the end of the locking member 310 is configured as a spherical surface, the shape of the locking groove 201 can be configured as a hemispherical groove to accommodate the insertion and ejection actions of the locking member 310.

[0049] The elastic element 320 is an elastic component made of elastic material, such as a spring, sheet metal, or elastic rubber. The elastic element 320 can be located on the side of the locking member 310 facing away from the positioning post 200. One end of the elastic element 320 is connected to the locking member 310, and the other end is fixed to the second end of the slide rail 102. When the locking member 310 moves towards the second end, the elastic element 320 can be compressed to store force and generate a restoring force to push the locking member 310 back to its original position. In this embodiment, the elastic element 320 is a helical spring.

[0050] When the positioning pin 200 is inserted into the positioning groove 101, its peripheral surface contacts the protruding part of the locking member 310. Since the extension direction of the slide 102 is perpendicular to the insertion direction of the positioning pin 200, the locking member 310 is subjected to lateral compression and slides along the slide 102 towards the second end. The elastic member 320 is compressed during the sliding of the locking member 310, storing elastic potential energy. When the positioning pin 200 continues to move until the locking groove 201 is aligned with the locking member 310, the restoring force of the elastic member 320 drives the locking member 310 back to the first end along the slide 102, so that the locking member 310 is embedded in the locking groove 201, completing the locking.

[0051] Furthermore, the locking member 310 has a fixing hole 3101 on the side facing the second end, and the second end of the slide 102 has a fixing post 120 protruding in the direction of the locking member 310. One end of the elastic member 320 is installed in the fixing hole 3101, and the other end is arranged around the periphery of the fixing post 120.

[0052] The fixing hole 3101 is a hole-like structure located at the end of the locking member 310 facing away from the positioning post 200. It can be a circular hole, a square hole, or an irregularly shaped hole, used to limit the displacement of the end of the elastic member 320. The fixing post 120 is a columnar protrusion extending from the second end of the slide rail 102 towards the first end. It can be a cylinder, a prism, or a post with a limiting boss, used to constrain the movement trajectory of the other end of the elastic member 320. When the locking member 310 slides towards the second end under the pressure of the positioning post 200, the distance between the fixing hole 3101 and the fixing post 120 decreases, causing the elastic member 320 to be compressed. During compression, the fixing hole 3101 provides axial constraint to the end of the elastic member 320, preventing the elastic member 320 from detaching from the locking member 310 when it slides; the fixing post 120 provides radial constraint to the other end of the elastic member 320, preventing lateral displacement of the elastic member 320 and thus avoiding deviation of the force direction from the axis of the slide rail 102. The mating relationship between the fixing hole 3101 and the fixing post 120 ensures that the elastic element 320 maintains a stable connection during dynamic processes, avoiding reset failure caused by the elastic element 320 falling off or shifting, thereby improving the insertion reliability of the locking element 310 and the locking groove 201.

[0053] Reference Figure 6 and Figure 7 In some embodiments, the battery pack 100 has a mounting groove 103 and a cover plate 110 on its connecting surface where the positioning groove 101 is provided. The extending direction of the mounting groove 103 is perpendicular to the extending direction of the positioning groove 101. The cover plate 110 covers the opening of the mounting groove 103. A first groove 1101 is provided on the side of the cover plate 110 facing the mounting groove 103. A second groove 1031 is provided on the inner wall surface of the mounting groove 103 facing the cover plate 110. The first groove 1101 and the second groove 1031 surround each other to form a slide 102.

[0054] The mounting groove 103 is a recessed structure located on the lower surface of the battery pack 100, extending perpendicularly to the positioning groove 101. The cover plate 110 is a plate-shaped component that closes the opening of the mounting groove 103, forming a closed slide 102 by covering the mounting groove 103. The first groove 1101 is a recessed structure located on the inner surface of the cover plate 110, and the second groove 1031 is a mating groove located on the inner wall of the mounting groove 103. The two grooves fit together to form a complete slide 102. In this embodiment, both the first groove 1101 and the second groove 1031 are semi-cylindrical grooves. When the cover plate 110 is closed over the opening of the mounting groove 103, the first groove 1101 and the second groove 1031 are positioned opposite each other, thus forming a cylindrical slide 102. The cover plate 110 can be detachably connected to the battery pack 100 by screws or other fasteners, allowing for easy assembly and disassembly of the entire elastic buckle 300, facilitating maintenance.

[0055] Reference Figure 7 Furthermore, at least one connecting buckle 111 is provided on the periphery of the cover plate 110, and at least one connecting groove 1032 is provided on the inner periphery of the mounting groove 103, with the connecting buckle 111 elastically engaged in the connecting groove 1032.

[0056] The connecting buckle 111 is a protruding structure located on the periphery of the cover plate 110. It can be made of an elastic material with barbs or a wedge-shaped cross-section, and its elasticity is achieved through deformation to achieve engagement. The connecting groove 1032 is a recessed structure complementary to the shape of the connecting buckle 111. When the cover plate 110 is installed into the mounting groove 103, the elastic engagement between the connecting buckle 111 and the connecting groove 1032 allows for initial positioning, determining the installation position of the cover plate 110 within the mounting groove 103. Multiple connecting buckles 111 and connecting grooves 1032 can be used; for example, connecting buckles 111 can be provided on opposite sides of the cover plate 110, and connecting grooves 1032 can be formed on the inner walls of the mounting groove 103 corresponding to two connecting buckles 111.

[0057] Reference Figure 8 In some embodiments, the energy storage device further includes a base 400 on which multiple battery packs 100 are stacked. The base 400 supports the stacked battery packs 100, ensuring the stability of the entire energy storage device. The shape and size of the base 400 match the bottom of the battery packs 100 to provide stable support. The structure of the base 400 can be arbitrary; in this embodiment, the base 400 has a rectangular frame structure and can be made of rigid plastic or lightweight alloy material. Furthermore, the upper surface of the base 400 may also be provided with positioning posts 200 to facilitate quick connection between the bottommost battery pack 100 and the base 400.

[0058] Furthermore, the upper and lower surfaces of the battery pack 100 may be respectively provided with a first connector and a second connector. Both the first and second connectors are electrically connected to the battery module 100c. In this embodiment, the first connector protrudes from the upper surface of the battery pack 100, and the second connector is recessed from the lower surface of the battery pack 100. During the stacking of the battery packs 100, while the positioning post 200 is inserted into the positioning slot 101, the first connector and the second connector are engaged to connect two adjacent battery packs 100 in series, thereby achieving rapid circuit conduction and improving the ease of assembly of the energy storage device.

[0059] Reference Figure 9 Secondly, embodiments of this application also provide an energy storage system, including an energy storage device and an inverter 500 as described in the first aspect embodiment. Multiple battery packs 100 in the energy storage device are electrically connected, and the inverter 500 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.

[0060] The energy storage device is an energy storage unit formed by electrically connecting multiple battery packs 100. The energy storage capacity can be flexibly adjusted by changing the number of battery packs 100 to adapt to different scenario requirements. The inverter 500 is a power electronic device that realizes the conversion between DC and AC power. Specifically, it can be implemented using a bidirectional converter topology, and the bidirectional conversion of electrical energy is achieved by controlling the on / off state of power devices such as IGBTs or MOSFETs. The inverter 500 can be stacked on top of the energy storage device. Specifically, the lower surface of the inverter 500 can also be provided with a positioning groove 101 that cooperates with the positioning post 200 and a second connector that cooperates with the first connector. After the inverter 500 is stacked on top of the uppermost battery pack 100 in the energy storage device, the second connector can cooperate with the first connector of the battery pack 100 for positioning and circuit conduction.

[0061] Electrical connection refers to the circuit continuity between battery packs 100 and between battery packs 100 and inverter 500. 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 the inverter 500 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 the inverter 500, and the battery packs 100 are charged via the battery management system. 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.

[0062] 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. An energy storage device, characterized in that, It includes multiple stacked battery packs, wherein in any two adjacent battery packs, one of the connecting surfaces is provided with a positioning post, and the other connecting surface is provided with a positioning groove and an elastic buckle; The elastic buckle protrudes from the inner wall of the positioning groove in the circumferential direction. The positioning post has a locking groove on its circumferential side. The positioning post is inserted into the positioning groove. When the positioning post moves in the positioning groove, it can squeeze the elastic buckle to make it elastically deform in the direction away from the positioning post. When the locking groove and the elastic buckle are in the same position, the elastic buckle can elastically reset and be inserted into the locking groove.

2. The energy storage device according to claim 1, characterized in that, The battery pack is provided with a slide rail, the extension direction of which is perpendicular to the extension direction of the positioning groove, and the slide rail has a first end facing the positioning groove and a second end facing away from the positioning groove; the elastic buckle includes: A locking element is slidably connected to the slide rail. One end of the locking element protrudes from the inner wall of the circumferential side of the positioning groove and slides toward the second end when subjected to the squeezing force of the positioning post. An elastic element, connected between the locking member and the battery pack, generates a restoring force toward the first end when the locking member slides toward the second end, so as to drive the locking member to slide toward the first end and insert into the locking groove when the locking groove corresponds to the position of the locking member.

3. The energy storage device according to claim 2, characterized in that, The projection shape of the end of the locking member facing away from the second end on a plane parallel to the extension direction of the slide is an flared shape that gradually expands toward the second end.

4. The energy storage device according to claim 3, characterized in that, The end surface of the locking member facing away from the second end is configured as a spherical surface that protrudes away from the second end.

5. The energy storage device according to claim 3, characterized in that, The slide rail includes a guide section and a limiting section. The guide section is connected between the positioning groove and the limiting section, and the inner diameter of the guide section is smaller than the inner diameter of the limiting section. The locking member includes a sliding part and a limiting part protruding from the periphery of the sliding part. The sliding part is slidably disposed within the guide section, and the limiting part is slidably disposed within the limiting section, thereby limiting the sliding range of the locking member within the slide rail.

6. The energy storage device according to claim 3, characterized in that, The locking member has a fixing hole on the side facing the second end, and the second end of the slide rail has a fixing post protruding towards the locking member. One end of the elastic member is installed in the fixing hole, and the other end is arranged around the periphery of the fixing post.

7. The energy storage device according to any one of claims 2-6, characterized in that, The battery pack has a mounting groove and a cover plate on the connecting surface where the positioning groove is provided, and the extension direction of the mounting groove is perpendicular to the extension direction of the positioning groove. The cover plate fits over the opening of the mounting groove. The cover plate has a first groove on the side facing the mounting groove, and the mounting groove has a second groove on the inner wall of the cover plate. The first groove and the second groove surround to form the slide.

8. The energy storage device according to claim 7, characterized in that, The cover plate has at least one connecting buckle protruding from its periphery, and the inner wall of the mounting groove has at least one connecting groove, with the connecting buckle elastically engaging in the connecting groove.

9. The energy storage device according to any one of claims 1-6, characterized in that, The energy storage device also includes a base on which multiple battery packs are stacked.

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.

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