Energy storage device

Abstract

The utility model provides an energy storage device. The energy storage device comprises a box body, a connecting plate and a battery cluster, wherein an accommodating cavity is formed in the box body; the connecting plate is located in the containing cavity, the connecting plate divides the containing cavity into a first sub-cavity and a second sub-cavity, the connecting plate comprises a plate body, output terminals, a conductive part and input terminals, at least part of the conductive part is located in the plate body, the multiple input terminals are arranged on the surface of the plate body, and the conductive part is electrically connected with the multiple input terminals and the output terminals; the battery cluster comprises at least two battery modules, each battery module comprises a pack body, a plurality of battery cells and a plug-in terminal, the plurality of battery cells are positioned in the pack body, and the plug-in terminal is arranged on the surface of the pack body and is electrically connected with the battery cells; at least one battery module is located in the first sub-cavity, and a plug terminal of the battery module is electrically connected with the input terminal; at least another battery module is located in the second sub-cavity, and the plug-in terminal of the battery module is electrically connected with the input terminal; the plurality of battery clusters are stacked in the accommodating cavity along the height direction of the box body;

Description

Technical Field

[0001] This application relates to the field of energy storage equipment, specifically to an energy storage device. Background Technology

[0002] Energy storage containers are a type of energy storage device, characterized by convenient installation and transportation, high integration, small footprint, and good scalability. They are an important component of the development of distributed energy, smart grids, and the energy internet in the field of energy storage.

[0003] Energy storage devices typically include enclosures to house battery modules. To provide power, electrical connectors are needed to connect each battery module to external devices. However, existing energy storage devices often use wiring harnesses to connect the battery modules, resulting in a complex overall structure. Furthermore, these wiring harnesses require considerable space and are cumbersome to install, failing to adequately meet usage requirements. Utility Model Content

[0004] In view of this, the embodiments of this application aim to provide an energy storage device to solve the problem that existing energy storage devices mostly use connecting harnesses to realize the electrical connection between battery modules, which has a relatively complex overall structure and requires a certain amount of space for installation, making the arrangement cumbersome.

[0005] This application provides an energy storage device, comprising:

[0006] The box has an internal cavity;

[0007] A connecting plate is located in the accommodating cavity, which divides the accommodating cavity into a first sub-cavity and a second sub-cavity. The connecting plate includes a plate body, an output terminal, a conductive element, and an input terminal. The conductive element is at least partially located in the plate body. A plurality of the input terminals are respectively arranged on the surface of the plate body, and the conductive element is electrically connected to the plurality of input terminals and the output terminals respectively.

[0008] A battery cluster includes at least two battery modules, each battery module comprising a housing, battery cells, and connector terminals. A plurality of battery cells are located within the housing, and the connector terminals are disposed on the surface of the housing and electrically connected to the battery cells. At least one battery module is located in a first sub-cavity, and the connector terminals of the battery module are electrically connected to an input terminal. At least another battery module is located in a second sub-cavity, and the connector terminals of the battery module are electrically connected to the input terminal.

[0009] Along the height direction of the housing, multiple battery clusters are stacked and arranged in the accommodating cavity.

[0010] In one embodiment of this application, the battery cluster includes at least three of the battery modules;

[0011] Each of the battery modules includes two plug terminals, one of which is a first positive terminal and the other of which is a first negative terminal;

[0012] The input terminal includes a second positive terminal and a second negative terminal. The conductive element includes a plurality of conductive bars, each conductive bar being electrically connected to any second negative terminal and any second positive terminal. Each first positive terminal is electrically connected to any second positive terminal, and each first negative terminal is electrically connected to any second negative terminal.

[0013] The first positive terminal of each battery module is electrically connected to the first negative terminal of another battery module, and the multiple battery modules are connected in series.

[0014] In one embodiment of this application, within the same battery cluster, in the orthographic projection of the housing along its height direction, the plurality of battery modules do not overlap, and along the height direction of the housing, the thicknesses of any two battery modules have at least a partially overlapping region; or,

[0015] In the same battery cluster, at least two battery modules at least partially overlap in the orthographic projection of the housing along its height direction.

[0016] In one embodiment of this application, among the plug-in terminals and input terminals that are electrically connected to each other, one is a hole end and the other is a plug end;

[0017] The end with the hole is provided with at least one electrical connection hole and at least one limiting hole. The plug end is provided with an electrical connection plug at the position of the electrical connection hole and a limiting plug at the position of the limiting hole. The limiting plug is constructed to protrude relative to the electrical connection plug and has a guide surface at its top. The guide surface is constructed to be a conical surface or a frustum surface that tapers towards the top.

[0018] In one embodiment of this application, the plug-in terminal is movably disposed on the package body; and / or, the output terminal and the input terminal are movably disposed on the connection plate.

[0019] In one embodiment of this application, the projection of the plate onto its vertical plane covers each of the battery clusters;

[0020] The horizontal and vertical edges of the plate are fixedly connected to the side wall of the box; and / or

[0021] The first and second sub-cavities are closed chambers.

[0022] In one embodiment of this application, the battery module includes at least four battery cells located within the package, the battery cells having a length direction and a width direction, each of the battery cells being configured to be arranged in parallel along the width direction, and including edge battery cells located at both ends of the width direction and a middle battery cell located between two of the edge battery cells;

[0023] Each of the central cells protrudes to one side of the length direction relative to the two edge cells, and the package, the long side of the central cell and the short side of the edge cell respectively form two edge mounting cavities; the plug-in terminal is at least partially located in the edge mounting cavity.

[0024] In one embodiment of this application, the package body, the short side of the central battery cell, and the long side of the edge battery cell form a central mounting cavity;

[0025] The package is provided with a first explosion-proof valve and a second explosion-proof valve; the first explosion-proof valve is disposed on the package that forms the edge mounting cavity, and the second explosion-proof valve is disposed on the package that forms the middle mounting cavity.

[0026] In one embodiment of this application, the battery module further includes a battery management unit disposed within the central mounting cavity.

[0027] In one embodiment of this application, the package includes a frame surrounding the battery cell in the length and width directions and a heat sink plate attached to the bottom surface of the battery cell; the energy storage device further includes a cooling device configured to cool each of the battery cells through the heat sink plate;

[0028] The package also includes a reinforcing plate located in the middle of the package and extending along the length of the battery cell, with both ends of the reinforcing plate being fixedly connected to the frame.

[0029] In the energy storage device of this application, by setting the aforementioned connecting plate, the plug terminals of the battery modules can be electrically connected to the input terminals on the connecting plate, and then output is performed using the output terminals, so that the energy storage device of this application can supply power to the outside. Compared with existing energy storage devices, the energy storage device of this application allows two battery modules on the same layer to be plugged into the connecting plate simultaneously, so that the conductive traces of the two battery modules can be arranged in the plate at the same time. This simplifies the related structure of the connecting components, and the connecting plate and the battery modules on both sides form a sandwich structure, which makes the force on both sides of the connecting plate more uniform and improves the stability of the structure. Attached Figure Description

[0030] Figure 1 The diagram shown is a structural schematic of the energy storage device of this application.

[0031] Figure 2The diagram shown is a structural schematic of the energy storage device of this application.

[0032] Figure 3 The diagram shown is a structural schematic of the energy storage device of this application.

[0033] Figure 4 The diagram shown is a partial structural schematic of the energy storage device of this application.

[0034] Figure 5 The diagram shown is a simplified structural schematic of the energy storage device of this application.

[0035] Figure 6 The diagram shown is a structural schematic of the battery module of this application.

[0036] Figure 7 The diagram shown is a structural schematic of the battery module of this application.

[0037] Attached image labels:

[0038] 10. Housing; 11. Receiving cavity; 111. First sub-cavity; 112. Second sub-cavity; 20. Connecting plate; 21. Plate body; 22. Output terminal; 23. Conductive component; 24. Input terminal; 241. Second positive terminal; 242. Second negative terminal; 30. Battery cluster; 31. Battery module; 311. Packaging; 3111. Frame; 3112. Heat sink; 3113. Reinforcing plate; 312. Battery cell; 3121. Middle battery cell; 3122. Edge battery cell; 313. Plug-in terminal; 3131. First positive terminal; 3132. First negative terminal; 3141. Edge mounting cavity; 3142. Middle mounting cavity; 3151. First explosion-proof valve; 3152. Second explosion-proof valve; 316. Battery management unit. Detailed Implementation

[0039] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0040] It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of this application. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0041] Many specific details are set forth in the following description to provide a full understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of this application; therefore, this application is not limited to the specific embodiments disclosed below. Techniques, methods, and apparatus known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and apparatus should be considered part of the specification.

[0042] The terminology used in one or more embodiments of this application is for the purpose of describing particular embodiments only and is not intended to limit the scope of one or more embodiments of this application. The singular forms “a,” “the,” and “the” used in one or more embodiments of this application and in the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” used in one or more embodiments of this application refers to and includes any or all possible combinations of one or more associated listed items.

[0043] It should be understood that although the terms first, second, etc., may be used to describe various information in one or more embodiments of this application, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, first may also be referred to as second without departing from the scope of one or more embodiments of this application, and similarly, second may also be referred to as first. Depending on the context, the word “if” as used herein may be interpreted as “when”, “in response to a determination”, or “upper”, “lower”, “front”, “back”, “left”, “right”, etc., are used only to indicate the relative positional relationship between related parts, and not to limit the absolute position of these related parts. In this document, “equal”, “same”, etc., are not strict mathematical and / or geometric limitations, and also include errors that are understandable to those skilled in the art and permissible in manufacturing or use. Unless otherwise stated, numerical ranges in this document include not only the entire range within its two endpoints, but also several sub-ranges contained therein.

[0044] The following reference Figures 1 to 7 The specific structure and working principle of the energy storage device of this application will be described in detail with reference to an embodiment.

[0045] like Figures 1 to 3 As shown, this application provides an energy storage device, including a housing 10, a connecting plate 20, and a battery cluster 30. The housing 10 has an internal accommodating cavity 11, which is used to accommodate various structures required by the energy storage device, such as the connecting plate 20 and the battery cluster 30.

[0046] like Figure 1 and Figure 2As shown, the connecting plate 20 is located in the accommodating cavity 11, dividing the accommodating cavity 11 into a first sub-cavity 111 and a second sub-cavity 112. Both the first sub-cavity 111 and the second sub-cavity 112 are used to accommodate the battery cluster 30. The connecting plate 20 includes a plate body 21, an output terminal 22, a conductive element 23, and an input terminal 24. The conductive element 23 is at least partially located within the plate body 21, and multiple input terminals 24 are respectively arranged on the surface of the plate body 21. The conductive element 23 electrically connects the multiple input terminals 24 and the output terminals 22 respectively.

[0047] like Figure 3 and Figure 4 As shown, the battery cluster 30 includes at least two battery modules 31. Each battery module 31 includes a housing 311, a battery cell 312, and a connector 313. Multiple battery cells 312 are located inside the housing 311, and the connector 313 is arranged on the surface of the housing 311 and electrically connected to the battery cells 312. At least one battery module 31 is located in a first sub-cavity 111, and the connector 313 of the battery module 31 is electrically connected to an input terminal 24. At least another battery module 31 is located in a second sub-cavity 112, and the connector 313 of the battery module 31 is electrically connected to an input terminal 24. Along the height direction of the housing 10, multiple battery clusters 30 are stacked in the receiving cavity 11.

[0048] Understandably, since each battery cluster 30 contains multiple battery modules 31, the connection plate 20 needs to have multiple output terminals 22 that are electrically connected to the plug-in terminals 313 of the battery modules 31. These output terminals 22 can be electrically connected to each other via conductive elements 23. The connection plate 20 can have multiple output terminals 22 or only one output terminal 22. When the connection plate 20 has multiple output terminals 22, multiple battery clusters 30 can share one output terminal 22, or each battery cluster 30 can have its own dedicated output terminal 22.

[0049] like Figure 6 As shown, each battery module 31 can be provided with two plug terminals 313, which are the plug terminals corresponding to the positive terminal and the plug terminals corresponding to the negative terminal, respectively; or only one plug terminal 313 can be provided, that is, the positive and negative terminals are integrated into one plug terminal 313.

[0050] As can be seen, in the energy storage device of this application, by setting the aforementioned connecting plate 20, the plug-in terminals 313 of the battery module 31 can be electrically connected to the input terminals 24 on the connecting plate 20 respectively, and then output is performed using the output terminal 22, so that the energy storage device of this application can supply power to the outside. Compared with the existing energy storage devices, the energy storage device of this application allows two battery modules 31 on the same layer to be plugged into the connecting plate 20 simultaneously, so that the conductive parts 23 of the two battery modules 31 can be arranged in the plate body 21 at the same time, which simplifies the related structure of the connecting parts, and the connecting plate 20 and the battery modules 31 on both sides form a sandwich structure, which makes the force on both sides of the connecting plate 20 more uniform and improves the stability of the structure. It should be noted that multiple can be two or more of any number. Specifically, the connecting plate can be a hollow plate so that there is space inside to accommodate the conductive parts. Preferably, the battery module as a whole is cubic; alternatively, the battery module as a whole can also be columnar or prismatic, etc., without too much limitation here.

[0051] Furthermore, such as Figures 2 to 5 As shown, the battery cluster 30 includes at least three battery modules 31; each battery module 31 includes two plug-in terminals 313, one of which is a first positive terminal 3131 and the other is a first negative terminal 3132; the input terminal 24 includes a second positive terminal 241 and a second negative terminal 242; the conductive element 23 includes multiple conductive bars, each conductive bar electrically connecting any second negative terminal 242 and any second positive terminal 241; each first positive terminal 3131 is electrically connected to any second positive terminal 241, and each first negative terminal 3132 is electrically connected to any second negative terminal 242; the first positive terminal 3131 of each battery module 31 is electrically connected to the first negative terminal 3132 of another battery module 31, and the multiple battery modules 31 are connected in series. This effectively ensures that in each battery cluster 30, each battery module 31 is electrically connected to the input terminal 24, and that the battery modules 31 in each battery cluster 30 are connected in series with each other.

[0052] Specifically, such as Figure 1 and Figure 3 As shown, in one embodiment of this application, in the same battery cluster 30, in the orthographic projection of the housing 10 in the height direction, multiple battery modules 31 do not overlap with each other, and along the height direction of the housing 10, the thickness of any two battery modules 31 has at least a partially overlapping area. In this way, it can be ensured that in the same battery cluster 30, each battery module 31 is located within approximately the same horizontal height range.

[0053] It is understandable that, due to errors in manufacturing processes and assembly, the individual battery modules 31 are not at the same absolute horizontal height. This embodiment allows for an error of 10cm-20cm, which should all be considered within the same horizontal height range. Specifically, multiple battery modules 31 within the same battery cluster 30 are roughly arranged on the same layer. This ensures that the connecting lines between the individual battery modules 31 within the same battery cluster 30 reduce the internal resistance of the connecting lines. Figure 1 and Figure 3 As shown, in one embodiment of this application, in the same battery cluster 30, at least two battery modules 31 at least partially overlap in the orthographic projection along the height direction of the housing 10. Specifically, multiple battery modules 31 in the same battery cluster 30 can be arranged in layers. For example, the battery cluster 30 includes four battery modules 31, wherein two battery modules 31 arranged opposite to each other on both sides of the connecting plate 20 are located on top of the other two battery modules 31 arranged opposite to each other on both sides of the connecting plate 20, i.e., a double-layer structure; wherein the four battery modules 31 in the same battery cluster 30 are connected in series.

[0054] In addition, those skilled in the art can adapt the number of battery modules 31 and the number of layers as needed, without making excessive limitations here. In this way, it can be ensured that each battery module 31 can be partially stacked in the same battery cluster 30, thereby reducing the area occupied by the battery cluster 30 and improving space utilization, without any limitations here. In one embodiment of this application, in the plug-in terminal 313 and the input terminal 24 that are electrically connected to each other, one is a hole end and the other is a plug end; the hole end is provided with at least one electrical connection hole and at least one limiting hole, the plug end is provided with an electrical connection plug at the position corresponding to the electrical connection hole, and a limiting plug at the position corresponding to the limiting hole. The limiting plug is constructed to protrude relative to the electrical connection plug, and a guide surface is provided at the top end. The guide surface is constructed to be a conical surface or a frustum surface that tapers towards the top end.

[0055] Thus, when the plug terminal 313 and the input terminal 24 are electrically connected, the limiting plug is first inserted into the limiting hole. The position between the two can be finely adjusted using the guide surface to ensure alignment between the hole end and the plug end. This ensures an effective electrical connection between the plug terminal 313 and the input terminal 24, preventing poor contact. The positions of the hole end and the plug end can be selected as needed and are not limited here.

[0056] In one embodiment of this application, the plug-in terminal 313 is movably disposed on the housing 311, and / or the output terminal 22 and the input terminal 24 are movably disposed on the connecting plate 20. In this way, the positions of the plug-in terminal 313, the output terminal 22 and the input terminal 24 can be flexibly adjusted as needed to facilitate the electrical connection between the terminals.

[0057] It is understandable that there are several ways in which the plug-in terminal 313 can be movably mounted on the housing 311. For example, a guide rail or similar device can be provided on the side of the housing 311, allowing the plug-in terminal 313 to slide on the guide rail. Alternatively, a combination of flexible copper strips, springs, and / or corrugated tubing can be used between the plug-in terminal 313 and the housing 311 to provide cushioning. This allows the plug-in terminal 313 to have a certain amount of displacement space in all directions when it is electrically connected to the input terminal 24. This avoids displacement deviations during battery module 31 installation that could prevent the plug-in terminal 313 from being accurately aligned with the input terminal 24, improving installation accuracy and efficiency. It also forms a buffer structure to prevent damage from hard collisions between the plug-in terminal 313 and the input terminal 24, extending the service life of the energy storage device. The structure of the output terminal 22 and the input terminal 24 movably mounted on the connecting plate 20 is similar and will not be described further here.

[0058] like Figures 1 to 3 As shown, in one embodiment of this application, the projection of the plate 21 on its vertical plane covers each battery cluster 30; the horizontal and vertical edges of the plate 21 are fixedly connected to the side wall of the housing 10, and the connecting plate 20 can effectively separate the first sub-cavity 111 and the second sub-cavity 112, thereby blocking the heat transfer between the first sub-cavity 111 and the second sub-cavity 112 and reducing the possibility of thermal runaway propagation of the battery module 31; and the fixed connection of the horizontal and vertical edges of the plate 21 to the side wall of the housing 10 can improve the connection stability of the battery module 31.

[0059] Furthermore, in one embodiment of this application, the first sub-cavity 111 and the second sub-cavity 112 are sealed chambers. In this way, the connecting plate 20 can completely block the heat transfer between the first sub-cavity 111 and the second sub-cavity 112, further preventing the spread of thermal runaway of the battery module 31 and effectively improving fire prevention.

[0060] The structure of plate 21 can be selected as needed. For example, in one embodiment of this application, plate 21 includes an insulating heat insulation plate. The insulating heat insulation plate can not only effectively block the heat transfer between the battery cavity and the high-voltage cavity, ensuring that the battery module 31 and the high-voltage control module operate within a safe and stable operating range, preventing high-voltage control module failure or fire caused by high temperature, but also prevent the heat generated by the high-voltage control module failure from being transferred to the battery module 31, avoiding the spread of thermal runaway of the battery module 31; it can also effectively prevent electrical breakdown between the high-voltage equipment and the battery module 31, reduce the risk of leakage, and ensure the safe operation of the entire energy storage device.

[0061] Specifically, the insulation board can be at least one of expanded polystyrene (EPS), extruded polystyrene (XPS), rigid polyurethane (PUR), or polyisocyanurate (PIR).

[0062] In another embodiment of this application, the plate 21 includes insulating plates on both sides and a heat-insulating filler layer between the two insulating plates. The insulating plates primarily prevent electrical breakdown between the high-voltage equipment and the battery module 31, while the heat-insulating filler layer ensures that heat transfer between the battery cavity and the high-voltage cavity is blocked, guaranteeing that both the battery module 31 and the high-voltage control module operate within a safe and stable operating range. Compared to a monolithic structure, the split structure of the plate 21 can effectively reduce the overall structural cost.

[0063] Specifically, the insulation board can be at least one of calcium silicate board, aerogel board, ceramic fiber board, expanded polystyrene (EPS), extruded polystyrene (XPS), rigid polyurethane (PUR) or polyisocyanurate (PIR); the thermal insulation filling layer can be rock wool (basalt fiber) or glass wool (glass fiber), etc.

[0064] like Figure 7 As shown, in one embodiment of this application, the battery module 31 includes at least four battery cells 312 located within a housing 311. The battery cells 312 have a length direction and a width direction. Each battery cell 312 is configured to be arranged in parallel along the width direction and includes edge cells 3122 located at both ends of the width direction and a middle cell 3121 located between two edge cells 3122. Each middle cell 3121 protrudes to one side of the length direction relative to the two edge cells 3122. The housing 311, the long side of the middle cell 3121 and the short side of the edge cells 3122 respectively form two edge mounting cavities 3141. The plug-in terminal 313 is at least partially located within the edge mounting cavity 3141.

[0065] Compared to the existing battery module 31 structure, the battery module 31 of this application has multiple cells 312 arranged in parallel along the width direction, which can make the center of gravity of the battery module 31 central and effectively improve the overall rigidity of the battery module 31; the plug-in terminal 313 is at least partially located in the edge mounting cavity 3141, which can facilitate the electrical connection between the plug-in terminal 313 and the input terminal 24 and reduce the installation difficulty.

[0066] Specifically, such as Figure 7 As shown, in one embodiment of this application, the battery module 31 of this application has eight cells 312 arranged in parallel along the width direction. Each cell 312 includes 13 battery cells, and the battery module 31 contains a total of 104 standard batteries. Compared with the existing battery module 31, the capacity of the cells 312 is effectively increased, and material costs are saved.

[0067] Furthermore, such as Figure 6 and Figure 7As shown, in one embodiment of this application, the short side of the package body 311 and the long side of the middle battery cell 3121 and the edge battery cell 3122 form a middle mounting cavity 3142; the package body 311 is provided with a first explosion-proof valve 3151 and a second explosion-proof valve 3152; the first explosion-proof valve 3151 is disposed on the package body 311 that forms the edge mounting cavity 3141, and the second explosion-proof valve 3152 is disposed on the package body 311 that forms the middle mounting cavity 3142.

[0068] In the battery module 31 of this application, since a first explosion-proof valve 3151 is provided at the corresponding position of the mounting cavity 3141 at the edge of the package 311, and a second explosion-proof valve 3152 is provided at the corresponding position of the mounting cavity 3142 in the middle, the distance between any battery cell and its nearest explosion-proof valve is relatively close. In this way, if any battery cell in the battery module 31 experiences thermal runaway and forms a large amount of gas, the pressure can be released by the nearby explosion-proof valve, thus avoiding the situation where the internal pressure of the battery module 31 of this application is too high and causes an explosion.

[0069] like Figure 7 As shown, in one embodiment of this application, the battery module 31 further includes a battery management unit 316, which is disposed within the central mounting cavity 3142. The battery management unit 316 is mainly used to communicate with the individual battery cells within the battery cells 312 to monitor battery status, balance the current within each battery cell, and detect abnormal conditions in the battery cells. Because the battery management unit 316 is disposed within the central mounting cavity 3142, the communication wiring requirements between the battery management unit 316 and each individual battery cell within the battery cells 312 can be reduced, and the overall structure of the battery module 31 of this application can be made more compact, effectively saving internal space in the battery module 31.

[0070] like Figure 7 As shown, in one embodiment of this application, each battery management unit 316 may correspond to four battery cells 312; in another embodiment of this application, the battery management unit 316 may also manage any number of battery cells 312 as needed, without limitation.

[0071] like Figure 7 As shown, in one embodiment of this application, the enclosure 311 includes a frame 3111 surrounding the battery cell 312 in both its length and width directions, and a heat sink 3112 attached to the bottom surface of the battery cell 312. The energy storage device also includes a cooling device configured to cool each battery cell 312 via the heat sink 3112. By providing the frame 3111, each battery cell 312 can be effectively protected, and by adding heat sink aluminum plates to both sides of the battery cell 312, heat conduction during the heating process of the battery cell 312 can be accelerated, allowing the battery cell 312 to operate in a stable temperature environment and greatly reducing the risk of thermal runaway of the battery cell 312.

[0072] like Figure 7 As shown, in one embodiment of this application, the package 311 further includes a reinforcing plate 3113 located in the middle of the package 311 and extending along the length direction of the battery cell 312. Both ends of the reinforcing plate 3113 are configured to be fixedly connected to the frame 3111. By providing the reinforcing plate 3113, the overall strength of the frame 3111 can be effectively improved.

[0073] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, etc., made within the spirit and principles of this application should be included within the protection scope of this application. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical applications, or technical improvements to the market of the embodiments, or to enable others skilled in the art to understand the embodiments disclosed herein. The scope of this application is defined by the appended claims.

Claims

1. An energy storage device, characterized in that, include: The box (10) has an internal cavity (11); A connecting plate (20) is located in the accommodating cavity (11). The connecting plate (20) divides the accommodating cavity (11) into a first sub-cavity (111) and a second sub-cavity (112). The connecting plate (20) includes a plate body (21), an output terminal (22), a conductive element (23), and an input terminal (24). The conductive element (23) is at least partially located in the plate body (21). A plurality of the input terminals (24) are respectively arranged on the surface of the plate body (21). The conductive element (23) is electrically connected to the plurality of input terminals (24) and the output terminals (22). A battery cluster (30) includes at least two battery modules (31), each battery module (31) including a housing (311), a battery cell (312), and a connector (313). Multiple battery cells (312) are located within the housing (311), and the connector (313) is arranged on the surface of the housing (311) and electrically connected to the battery cells (312). At least one battery module (31) is located in the first sub-cavity (111), and the connector (313) of the battery module (31) is electrically connected to the input terminal (24). At least another battery module (31) is located in the second sub-cavity (112), and the connector (313) of the battery module (31) is electrically connected to the input terminal (24). Along the height direction of the housing (10), a plurality of battery clusters (30) are stacked in the accommodating cavity (11).

2. The energy storage device according to claim 1, characterized in that, The battery cluster (30) includes at least three of the battery modules (31); Each of the battery modules (31) includes two plug terminals (313), one of which is a first positive terminal (3131) and the other of which is a first negative terminal (3132). The input terminal (24) includes a second positive terminal (241) and a second negative terminal (242). The conductive element (23) includes a plurality of conductive bars. Each conductive bar is electrically connected to any second negative terminal (242) and any second positive terminal (241). Each first positive terminal (3131) is electrically connected to any second positive terminal (241), and each first negative terminal (3132) is electrically connected to any second negative terminal (242). The first positive terminal (3131) of each battery module (31) is electrically connected to the first negative terminal (3132) of another battery module (31), and the multiple battery modules (31) are connected in series.

3. The energy storage device according to claim 2, characterized in that, In the same battery cluster (30), in the orthographic projection of the housing (10) in the height direction, the multiple battery modules (31) do not overlap each other, and along the height direction of the housing (10), the thickness of any two battery modules (31) has at least a partially overlapping area. or, In the same battery cluster (30), at least two battery modules (31) at least partially overlap in the orthographic projection of the housing (10) in the height direction.

4. The energy storage device according to claim 1, characterized in that, In the interconnected plug terminal (313) and input terminal (24), one is a hole end and the other is a plug end; The end with the hole is provided with at least one electrical connection hole and at least one limiting hole. The plug end is provided with an electrical connection plug at the position of the electrical connection hole and a limiting plug at the position of the limiting hole. The limiting plug is constructed to protrude relative to the electrical connection plug and has a guide surface at its top. The guide surface is constructed to be a conical surface or a frustum surface that tapers towards the top.

5. The energy storage device according to claim 1, characterized in that, The plug-in terminal (313) is movably disposed on the package (311); and / or, the output terminal (22) and the input terminal (24) are movably disposed on the connecting plate (20).

6. The energy storage device according to claim 1, characterized in that, The projection of the plate (21) on its vertical plane covers each of the battery clusters (30); The horizontal and vertical edges of the plate (21) are fixedly connected to the side wall of the box (10); and / or, The first sub-cavity (111) and the second sub-cavity (112) are closed chambers.

7. The energy storage device according to any one of claims 1 to 6, characterized in that, The battery module (31) includes at least four cells (312) located within the package (311). The cells (312) have a length direction and a width direction. Each of the cells (312) is configured to be arranged in parallel along the width direction and includes edge cells (3122) located at both ends of the width direction and a middle cell (3121) located between two edge cells (3122). Each of the central cells (3121) protrudes to one side of the length direction relative to the two edge cells (3122), and the long side of the package (311), the central cells (3121), and the short side of the edge cells (3122) respectively form two edge mounting cavities (3141); the plug-in terminal (313) is at least partially located in the edge mounting cavity (3141).

8. The energy storage device according to claim 7, characterized in that, The package (311), the short side of the central cell (3121), and the long side of the edge cell (3122) form a central mounting cavity (3142); The package (311) is provided with a first explosion-proof valve (3151) and a second explosion-proof valve (3152); the first explosion-proof valve (3151) is disposed on the package (311) surrounding the edge mounting cavity (3141), and the second explosion-proof valve (3152) is disposed on the package (311) surrounding the middle mounting cavity (3142).

9. The energy storage device according to claim 8, characterized in that, The battery module (31) also includes a battery management unit (316), which is disposed in the central mounting cavity (3142).

10. The energy storage device according to any one of claims 1 to 6, characterized in that, The package (311) includes a frame (3111) located around the battery cell (312) in the length and width directions and a heat sink (3112) attached to the bottom surface of the battery cell (312); the energy storage device also includes a cooling device configured to cool each of the battery cells (312) through the heat sink (3112); The package (311) also includes a reinforcing plate (3113) located in the middle of the package (311) and extending along the length direction of the battery cell (312), the two ends of the reinforcing plate (3113) being fixedly connected to the frame (3111).

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