An energy storage device

Abstract

The application discloses an energy storage device, comprising a shell, a battery unit arranged in the shell, a circuit board assembly and an inverter assembly electrically connected with the battery unit. The shell comprises a front wall, a rear wall, a left wall, a right wall, and upper and lower frames connecting the walls. The upper and lower frames are connected by fasteners, and the walls are installed around the frames to form a complete shell. The upper and lower frames are respectively provided with a limiting part and a baffle, which together form a limiting groove. The edges of the walls are provided with multiple limiting ribs, which are installed in the limiting groove by a clamping mode, realizing quick positioning and assembly without additional fasteners, improving the installation efficiency and structural stability.

Description

Technical Field

[0001] This application relates to an energy storage device. Background Technology

[0002] Energy storage devices, as important energy storage and conversion equipment, are widely used in home backup power, outdoor power supply, emergency energy, and distributed energy systems. These devices typically include a housing, battery cells housed within the housing, circuit board assemblies electrically connected to the battery cells, and inverter components, used to store, manage, and convert electrical energy between AC and DC.

[0003] Currently, common energy storage device casings mostly adopt structural forms such as sheet metal welding, bolt splicing, or integral injection molding. While these structures meet installation and protection requirements to a certain extent, they still suffer from problems such as complex assembly processes, low production efficiency, insufficient overall structural stability, and inconvenience in maintenance and disassembly. In particular, when fixing multiple enclosures, a large number of screws or clips are often required, which not only increases material costs and assembly time, but may also affect the rigidity and sealing performance of the overall structure due to too many connection points. Utility Model Content

[0004] The purpose of at least one specific embodiment of this utility model is to overcome the defects of the existing technology and provide an energy storage device.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] An energy storage device includes a housing, a battery cell disposed within the housing, a circuit board assembly electrically connected to the battery cell, and an inverter assembly electrically connected to the battery cell;

[0007] The housing includes an upper frame, a lower frame, and multiple enclosures connected between the two.

[0008] The upper frame and the lower frame are connected and fixed by fasteners, and the multiple side panels are fixedly installed between the upper frame and the lower frame by a snap-fit ​​method.

[0009] Furthermore, the upper frame has a first limiting groove, the lower frame has a second limiting groove, and the plurality of the surrounding panels are located between the upper frame and the lower frame, with their edges engaged and limited by the first limiting groove and the second limiting groove.

[0010] Furthermore, the upper edge of the enclosure is provided with a top limiting rib, the lower edge is provided with a bottom limiting rib, and the two sides are respectively provided with side limiting ribs.

[0011] After the enclosure is installed, the top limiting rib, the bottom limiting rib, and the side limiting rib engage with the first limiting groove of the upper frame and the second limiting groove of the lower frame, respectively.

[0012] Furthermore, the upper frame is provided with a first limiting part extending toward the lower frame, and the lower frame is provided with a second limiting part extending toward the upper frame;

[0013] The first limiting groove extends to the end of the first limiting part to form a first insertion port, and the second limiting groove extends to the end of the second limiting part to form a second insertion port.

[0014] Furthermore, the first insertion port is adapted to guide the end of the side limiting rib at the upper end of the enclosure to slide into the first limiting groove, and the second insertion port is adapted to guide the end of the side limiting rib at the lower end of the enclosure to slide into the second limiting groove.

[0015] Furthermore, the first limiting part is disposed at the four corners of the upper frame, and the second limiting part is disposed at the four corners of the lower frame.

[0016] Furthermore, the upper frame is provided with a first connecting part, and the lower frame is provided with a second connecting part. The fastener passes through the first connecting part and the second connecting part to fasten the upper frame and the lower frame together.

[0017] Furthermore, the plurality of enclosures includes a front enclosure, a rear enclosure, a left enclosure, and a right enclosure.

[0018] Furthermore, after the upper frame and the lower frame are connected and fixed by fasteners, a hollow part is formed around them; the multiple side panels are snapped and installed at the hollow part, and together with the upper frame and the lower frame, they enclose the shell.

[0019] Furthermore, after the upper frame and the lower frame are spliced ​​and fixed, the upper edge, lower edge and side edges of the enclosure are respectively accommodated in the first limiting groove and the second limiting groove, so that each edge of the enclosure is circumferentially covered and axially limited by the first limiting groove and the second limiting groove.

[0020] Compared with the prior art, the beneficial effects of this application are as follows: the upper frame and the lower frame of this application are directly and firmly connected by fasteners to form a stable main load-bearing frame; at the same time, multiple side panels are fixed between the frames by snap-fitting, which greatly reduces the number of screws and other fasteners required in the traditional shell assembly process, simplifies the assembly process, and the multiple side panels are fixed between the frames by snap-fitting, so that the entire shell structure is subjected to uniform stress, and the overall rigidity and structural stability are effectively enhanced. Attached Figure Description

[0021] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the energy storage device of this application.

[0023] Figure 2 This is an explosion diagram of the energy storage device of this application.

[0024] Figure 3 for Figure 2 A structural diagram from another angle.

[0025] Figure 4 This is a bottom view of the energy storage device in this application.

[0026] Figure 5 for Figure 4 A schematic diagram of the cross section along line AA.

[0027] Figure 6 for Figure 4 A schematic diagram of the cross section along line BB.

[0028] Figure 7 This is a schematic diagram of the assembly of the energy storage device of this application.

[0029] Figure 8 This is a partial explosion diagram of the energy storage device of this application.

[0030] Figure 9 This is a schematic diagram of the energy storage device of this application from another angle.

[0031] Figure 10 This is a schematic diagram of the assembly of the circuit board and the front panel of this application.

[0032] Figure 11 This is a frontal view of the front panel of this application.

[0033] Figure 12 for Figure 10 An explosion diagram.

[0034] Figure 13 This is a schematic diagram of the circuit board and front panel assembled in this application from another angle. Detailed Implementation

[0035] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0036] Reference Figures 1 to 6 , Figure 10 An energy storage device 100 includes a housing 10, a battery unit 20 disposed within the housing 10, a circuit board assembly 30 electrically connected to the battery unit 20, and an inverter assembly 40 electrically connected to the battery unit 20.

[0037] The shell 10 includes a front panel 101, a rear panel 102, a left panel 103, and a right panel 104. An upper frame 105 is installed on the top of each panel, and a lower frame 106 is installed on the bottom of each panel. The upper frame 105 has a first connecting part 107, and the lower frame 106 has a second connecting part 108. Fasteners 109 are provided on the first connecting part 107 or the second connecting part 108. The fasteners 109 connect and fix the upper frame 105 and the lower frame 106, thereby forming a stable frame structure of the shell 10. After the frame structure is formed, a hollow part is formed around it. After the front panel 101, rear panel 102, left panel 103, and right panel 104 are fixedly installed around the frame structure, they can form the shell 10 together with the frame structure.

[0038] In this embodiment, refer to Figure 7 , Figure 8 , Figure 9 The second connecting part 108 has a through hole 108a, through which a fastener 109 passes, with its end protruding from the through hole 108a. Correspondingly, the first connecting part 107 has a mounting hole 107a, which corresponds to the position of the through hole 108a, and a locking member 110 is fixedly installed therein. Specifically, the fastener 109 can be a screw structure, and the locking member 110 is a lock nut. When the upper frame 105 and the lower frame 106 are spliced, the fastener 109 passes through the through hole 108a of the second connecting part 108 and extends into the mounting hole 107a of the upper frame 105, achieving a tight connection through threaded engagement with the locking member 110, thereby reliably completing the fixation and splicing between the upper and lower frames.

[0039] In some embodiments, the separate locking element is eliminated, and instead, an internal thread is machined into the inner wall of the mounting hole 107a in the first connecting portion 107. Correspondingly, the fastener 109 still passes through the through hole 108a in the second connecting portion 108. When the upper frame 105 and the lower frame 106 are joined, the end of the fastener 109 passes through the through hole 108a and screws into the mounting hole 107a, and its external thread directly engages with the internal thread on the inner wall of the mounting hole 107a to achieve a fastening connection. This method, by eliminating the separate locking element and integrating the locking function into the mounting hole itself, also achieves reliable fixing and joining between the upper and lower frames, and the structure is more simplified.

[0040] Reference Figure 9 After the upper frame 105 and the lower frame 106 are spliced ​​and fixed, the lower frame 106 is constructed as the base of the entire housing 10. When the energy storage device 100 is placed on the ground, the lower frame 106 serves as a supporting base in contact with the ground. To prevent external impurities from entering the interior through the end of the through hole 108a, a plug 111 is fixedly installed on the lower frame 106 at the position corresponding to the end of the through hole 108a. The plug 111 can effectively cover the end opening of the through hole 108a, thereby providing a sealing and protective function.

[0041] Additionally, refer to Figure 2 The top of the upper frame 105 is also equipped with a handle 50 that rotates. The handle 50 is normally in the storage state. When it is necessary to lift the entire energy storage device 100, the handle 50 is unfolded and the energy storage device 100 can be lifted by hand through the handle 50. The energy storage device 100 is easy to carry and transfer.

[0042] Reference Figure 2 , Figure 3 , Figure 7 , Figure 8 The following section, in conjunction with the specific structures of the upper frame 105 and the lower frame 106, provides a comprehensive and systematic explanation of the installation process of the front enclosure 101, rear enclosure 102, left enclosure 103, and right enclosure 104. The overall structural stability of the energy storage device 100 largely depends on the correct installation and reliable fixing of its external enclosure panels. The upper frame 105 and lower frame 106, as the main load-bearing components of the entire shell 10, not only provide support and connection but also achieve precise positioning and secure fastening of each enclosure panel through a limiting structure.

[0043] From an overall structural perspective, the upper frame 105 has first limiting portions 105a extending vertically towards the lower frame 106 at its four corners. These limiting portions serve as key components for upper positioning, achieving initial positioning through cooperation with the upper edge of the enclosure. Similarly, the lower frame 106 has second limiting portions 106a extending towards the upper frame 105 at its four corners, with a structure corresponding to the first limiting portions 105a, used to support the lower edge of the enclosure and provide bottom support. To further enhance overall rigidity and limit horizontal displacement of the enclosure, the upper frame 105 also has first baffles 105b between adjacent first limiting portions 105a, and the lower frame 106 has second baffles 106b between adjacent second limiting portions 106a. These baffles not only act as reinforcing ribs but also, together with the limiting portions and the inner surface of the frame, form a limiting groove structure.

[0044] Specifically, the first limiting part 105a, the first baffle 105b, and the inner side of the upper frame 105 form a continuous first limiting groove 105c. This limiting groove is distributed along the periphery of the frame and is used to accommodate the protruding ribs on the upper part of the enclosure and restrict their movement. Similarly, the second limiting part 106a, the second baffle 106b, and the inner side of the lower frame 106 form a second limiting groove 106c, whose function corresponds to the first limiting groove 105c, and is used for positioning and fixing the lower part of the enclosure. The two limiting grooves extend to the ends of the limiting parts, forming important guide structures: for example, the first limiting groove 105c extends to the end of the first limiting part 105a to form a first insertion port 105d, and the second limiting groove 106c extends to the end of the second limiting part 106a to form a second insertion port 106d. The design of these insertion ports allows the limiting ribs on the enclosure to smoothly enter the limiting grooves, greatly simplifying the installation process.

[0045] It should be noted that the first limiting groove 105c area on one side of the first limiting part 105a forms a guide groove for the insertion of each enclosure plate. Similarly, the second limiting groove 106c area on one side of the second limiting part 106a also forms a corresponding guide groove. The inner surface of the guide groove is specially treated to have a low coefficient of friction, which facilitates the sliding of the enclosure plate while providing sufficient resistance to prevent accidental dislodgement.

[0046] In this embodiment, the front panel 101, rear panel 102, left panel 103, and right panel 104 are all fixedly installed between the upper frame 105 and the lower frame 106 using a snap-fit ​​method. This connection method ensures the reliability of the connection and avoids the use of a large number of fasteners, thus improving assembly efficiency. To achieve this snap-fit ​​connection, each panel is designed with a structure of multiple limiting ribs. Specifically, top limiting ribs 100a are provided on the side of the front panel 101, rear panel 102, left panel 103, and right panel 104 near the upper frame 105, and these ribs are continuously distributed along the upper edge of the panel.

[0047] Each panel has a bottom limiting rib 100b on the side near the lower frame 106, which is similar in design to the top limiting rib 100a. In addition, on the two sides of each panel located between the top limiting rib 100a and the bottom limiting rib 100b, there are first side limiting ribs 100c and second side limiting ribs 100d, respectively. These side limiting ribs, together with the upper and lower limiting ribs (top limiting rib 100a and bottom limiting rib 100b), form a complete positioning system to ensure that the panel is effectively constrained in three directions.

[0048] In the actual installation process, the first step is to install the side panels on the lower frame 106. The installer must accurately align the ends of the first side limiting ribs 100c and second side limiting ribs 100d on both sides of the front panel 101, rear panel 102, left panel 103, and right panel 104 with the second insertion port 106d on the lower frame 106. During this process, attention must be paid to alignment accuracy. After each panel is aligned, when appropriate pressure is applied, the first side limiting ribs 100c and second side limiting ribs 100d on the sides of each panel will slide along the guide groove on the side of the second limiting part 106a into the second limiting groove 106c of the lower frame 106. A clear "click" sound can be heard during this process, indicating that the limiting ribs have fully entered the limiting groove. After each panel is pressed into place, the bottom limiting rib 100b, the first side limiting rib 100c, and the second side limiting rib 100d are all axially limited by the second limiting groove 106c. At this time, the lower part of the panel is completely fixed and will not move axially.

[0049] After the panels on the lower frame 106 are installed, the upper frame 105 needs to be installed. When installing the upper frame 105, it is necessary to align the upper frame 105 with each panel already installed on the lower frame 106, ensuring that the first insertion port 105d on the upper frame 105 is precisely aligned with the ends of the first side limiting ribs 100c and the second side limiting ribs 100d of each panel. After alignment, press the upper frame 105 smoothly to move it toward the lower frame 106. During this process, the first side limiting ribs 100c and the second side limiting ribs 100d on the sides of each panel will slide into the first limiting groove 105c of the upper frame 105 along the guide groove on the side of the first limiting part 105a. Once the upper frame 105 is fully in place, the top limiting ribs 100a, the first side limiting ribs 100c, and the second side limiting ribs 100d of each panel are axially limited by the first limiting groove 105c, at which point the panels are effectively constrained in all directions.

[0050] After all the panels are axially limited between the upper frame 105 and the lower frame 106, the upper frame 105 and the lower frame 106 are finally fixedly connected by fasteners 109. In this embodiment, there are four first connecting parts 107 on the upper frame 105, located at the four corners of the upper frame 105; there are also four second connecting parts 108 on the lower frame 106, located at the four corners of the lower frame 106, corresponding one-to-one with the first connecting parts 107. Correspondingly, there are also four fasteners 109 that fix the first connecting parts 107 and the second connecting parts 108. The positions of these connecting parts are carefully designed to ensure the strength of the connection while avoiding interference with the limiting structure.

[0051] As can be seen from the above installation process, the enclosure installation system designed in this way has the following advantages: First, the combination of multiple limiting ribs and limiting grooves ensures the correct positioning and reliable fixation of the enclosure in all directions; second, the guide groove design greatly simplifies the installation process and reduces the skill requirements for operators; third, the snap-fit ​​connection method reduces the reliance on fasteners and improves assembly efficiency; finally, the entire system has good maintainability, and the enclosure can be disassembled simply by loosening the fasteners when it needs to be replaced, without the need for special tools.

[0052] Furthermore, refer to Figures 10 to 13 The energy storage device 100 of this application is also equipped with an ambient light 200, which is electrically connected to the circuit board 301 in the circuit board assembly 30 inside the device. Its core function is to intuitively display the real-time operating status of the energy storage device 100, such as standby, charging, discharging, power level, and fault diagnosis information, through programmable control of light color changes, brightness adjustment, and multiple flashing modes. This design not only enhances the human-machine interaction capability of the device, but also significantly improves the visual aesthetics and user experience of the product on the basis of functional indication.

[0053] Specifically, the ambient light 200 is arranged inside the front panel 101 of the energy storage device 100. The back of the front panel 101 has an integrally formed or assembled mounting portion 101a, which contains a mounting cavity 101b for housing and protecting the entire ambient light 200. The ambient light 200 mainly includes the following core components: an ambient light body 210, serving as a structural carrier and heat dissipation substrate; high-brightness, multi-color LED beads encapsulated within it, responsible for light output; a light guide 220, achieving uniform distribution and guidance of light; and a light-emitting portion 230 located on one side of the light body, which typically employs a microstructure optical design (such as a lens or scattering texture) to control the light emission angle and light spot shape, ensuring that light can be projected onto the target area in the intended manner, providing clear status indication while avoiding glare.

[0054] For mechanical fastening, the ambient light body 210 is equipped with carefully designed elastic buckles 240 on both sides. Correspondingly, a matching slot 101c is pre-set on the inner wall of the mounting cavity 101b. During installation, the operator only needs to push the ambient light body 210 into the mounting cavity 101b along the guide structure. The buckles 240 and the slots 101c automatically engage, producing a clear assembly feedback sound and tactile feedback, achieving a firm mechanical lock.

[0055] To further improve installation accuracy and long-term stability under vibration and impact environments, the ambient light body 210 is equipped with a specially designed positioning part 250, which is typically a boss or hole structure. A high-precision positioning groove 101d is provided at the corresponding position on the back of the front panel 101, in which a positioning post 101e is pre-embedded or injection-molded. During the installation of the ambient light, the positioning part 250 must be accurately embedded into the positioning groove 101d, while the positioning post 101e penetrates the positioning part 250, forming an interference fit or a transition fit. This "one-sided, two-pin" positioning method achieves complete constraint of the light body in multiple degrees of freedom, effectively preventing displacement, rotation, or tilting of the light body during long-term use, ensuring that the light-emitting part 230 is always aligned with the preset light path channel, and guaranteeing the accuracy and consistency of the visual indication effect.

[0056] The circuit board 301, as the core of the entire lighting control, is also fixed to the back of the front panel 101. The front panel 101 is designed with multiple structurally reinforced mounting bases 101f. When the circuit board 301 is mounted, its back side contacts the surface of the mounting base 101f and is locked in place by several fasteners 300 (bolt connection in the example in the figure).

[0057] In this embodiment, the extension height (i.e., support height) of the mounting base 101f towards the circuit board 301 is intentionally designed to be greater than the extension height of the positioning post 101e. This height difference allows an air gap 400 of a specific size to be naturally formed between the circuit board 301 and the back of the ambient light body 210 after it is fastened. This gap 400 increases the surface area for heat dissipation from the electronic components on the circuit board 301 to the surrounding air, preventing heat accumulation in the sealed space between the circuit board 301 and the ambient light body 210. At the same time, the presence of the gap 400 also prevents the high temperature of the circuit board 301 from being directly conducted to the ambient light 200 through radiation, preventing the lamp beads from experiencing a decrease in luminous efficiency, wavelength drift, or lifespan reduction due to long-term overheating, thereby improving the overall thermal reliability and service life of the energy storage device during long-term continuous operation.

[0058] On the other hand, a functional area 500 with highly concentrated human-computer interaction functions is located on the front of the front panel 101. This area centrally houses various electrical interfaces, including AC input / output interfaces, high-current DC interfaces, and USB-C interfaces compliant with modern fast charging protocols such as USB Power Delivery, to meet diverse energy input and output needs of users. To achieve deep integration of ambient lighting and visual guidance of the functional area, a light outlet 600 is provided adjacent to the functional area 500 on the front panel 101. This light outlet 600 is physically connected to the mounting cavity 101b on the rear.

[0059] The functional area 500 is recessed on the surface of the front bulkhead 101, while the edge of the front bulkhead 101 is raised relative to the functional area 500. The protrusion formed by the edge of the front bulkhead 101 provides the space required for the mounting cavity 101b.

[0060] From a vertical projection perspective, the projection surface of the light outlet 600 covers the bottom area of ​​the functional area 500. When the ambient light 200 is correctly installed, its light-emitting part 230 maintains the optimal coupling distance with the light outlet 600, ensuring that the emitted light is efficiently and evenly projected onto the functional area 500 and its surroundings. Users can not only intuitively determine the current status of the device based on the color of the light effect (e.g., green for full charge, yellow for medium charge, red for low charge or malfunction), brightness, and dynamic mode (e.g., constant light, breathing, flashing, flowing light, etc.), but also provide auxiliary lighting for interface connection operations in low-light environments, reducing the risk of misoperation. It combines strong functionality with an elegant ambient atmosphere.

[0061] The ambient light 200 of the energy storage device 100 adopts a concealed design. Its core lies in seamlessly embedding the functional lighting element into the product structure. The ambient light 200 is not fixed in an exposed manner, but is completely embedded in a dedicated mounting cavity 101b on the back of the front panel 101. The mounting cavity 101b is composed of a mounting part 101a structure, the size of which matches the ambient light body 210. This ensures that after the light body is installed, it is flush with the surface of the surrounding panels or without any protrusions. When viewed from the outside, the light source or internal structure cannot be directly seen, achieving "concealment" in a physical sense. There are no obvious light body structures or protrusions in the visible area of ​​the front panel 101. The only visible part related to the ambient light is the light outlet 600 opened for light emission. This light outlet is usually designed in the form of a narrow slit, a small hole, or a light-transmitting strip. Its shape is consistent with the overall design language of the product. When not lit, it can be integrated with the panel, avoiding damage to the integrity of the overall appearance.

[0062] The ambient light body 210, comprising a light guide 220 and a light emitter 230, forms a highly efficient optical system. Light emitted from the LED beads is first captured by the light guide 220, undergoing multiple reflections and diffusions within it to eliminate uneven brightness from point light sources. Finally, the light is guided to the light emitter 230 (a window specifically facing the light outlet 600). The light emitter 230, in conjunction with the light outlet 600, scatters the light through scattering, micro-texture etching, or lens structure treatment, creating a uniform and soft light band or halo. From the user's perspective, the light appears to be transmitted from the panel (front panel 101) itself, rather than from an abrupt light-emitting component, creating a sophisticated visual texture.

[0063] The projection from the light outlet 600 precisely covers the bottom of the functional area 500, meaning that the ambient light is not merely decorative but directly serves the operating area. When a user approaches the energy storage device 100 or performs an operation, the light illuminates, clearly indicating the interface location and conveying the device status through color changes. Functional indications are seamlessly integrated into the human-computer interaction scenario.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. An energy storage device, comprising a housing, a battery cell disposed within the housing, a circuit board assembly electrically connected to the battery cell, and an inverter assembly electrically connected to the battery cell; Its features are, The housing includes an upper frame, a lower frame, and multiple enclosures connected between the two. The upper frame and the lower frame are connected and fixed by fasteners, and the multiple side panels are fixedly installed between the upper frame and the lower frame by a snap-fit ​​method.

2. The energy storage device according to claim 1, characterized in that, The upper frame has a first limiting groove, the lower frame has a second limiting groove, and the plurality of the surrounding panels are located between the upper frame and the lower frame, with their edges engaged and limited by the first limiting groove and the second limiting groove.

3. The energy storage device according to claim 2, characterized in that, The upper edge of the enclosure is provided with a top limiting rib, the lower edge is provided with a bottom limiting rib, and the two sides are provided with side limiting ribs respectively. After the enclosure is installed, the top limiting rib, the bottom limiting rib, and the side limiting rib engage with the first limiting groove of the upper frame and the second limiting groove of the lower frame, respectively.

4. The energy storage device according to claim 3, characterized in that, The upper frame is provided with a first limiting part extending toward the lower frame, and the lower frame is provided with a second limiting part extending toward the upper frame; The first limiting groove extends to the end of the first limiting part to form a first insertion port, and the second limiting groove extends to the end of the second limiting part to form a second insertion port.

5. The energy storage device according to claim 4, characterized in that, The first insertion port is adapted to guide the end of the side limiting rib at the upper end of the enclosure to slide into the first limiting groove, and the second insertion port is adapted to guide the end of the side limiting rib at the lower end of the enclosure to slide into the second limiting groove.

6. The energy storage device according to claim 4, characterized in that, The first limiting part is disposed at the four corners of the upper frame, and the second limiting part is disposed at the four corners of the lower frame.

7. The energy storage device according to claim 1, characterized in that, The upper frame is provided with a first connecting part, and the lower frame is provided with a second connecting part. The fastener passes through the first connecting part and the second connecting part to fasten the upper frame and the lower frame together.

8. The energy storage device according to claim 1, characterized in that, The plurality of enclosures includes a front enclosure, a rear enclosure, a left enclosure, and a right enclosure.

9. The energy storage device according to claim 1, characterized in that, After the upper frame and the lower frame are connected and fixed by fasteners, a hollow part is formed around them; the multiple side panels are snapped and installed at the hollow part, and together with the upper frame and the lower frame, they enclose the shell.

10. The energy storage device according to any one of claims 2-5, characterized in that, After the upper frame and the lower frame are spliced ​​and fixed, the upper edge, lower edge and side edges of the enclosure are respectively accommodated in the first limiting groove and the second limiting groove, so that each edge of the enclosure is circumferentially covered and axially limited by the first limiting groove and the second limiting groove.

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