Battery device, energy storage container and electric device

Abstract

The utility model provides a battery device, an energy storage container and an electric device. The battery pack comprises at least two battery packs. The at least two battery packs are stacked in the height direction, each battery pack comprises a battery box and a plurality of battery monomers arranged in the battery box, and each battery box comprises a bottom plate and an opening opposite to the bottom plate; the at least two battery packs comprise an upper-layer battery pack and a lower-layer battery pack which are adjacently arranged, and a battery box of the lower-layer battery pack is configured to bear the upper-layer battery pack. In the technical scheme of the embodiment of the invention, the upper-layer battery pack is carried on the battery box of the lower-layer battery pack. The weight of the upper-layer battery pack is borne by the battery box of the lower-layer battery pack, so that a bearing frame does not need to be specially arranged, the occupied volume of the bearing frame is reduced, and the energy density of the battery device can be increased.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a battery device, an energy storage container, and an electrical device. Background Technology

[0002] With the rapid development of new energy sources, battery devices are being widely used. Improving the energy density of battery devices is a problem that urgently needs to be solved. Summary of the Invention

[0003] In view of the above problems, this application provides a battery device, an energy storage container, and an electrical device to improve the energy density of the battery device.

[0004] The first aspect of this application provides a battery device including at least two battery packs stacked in the height direction. Each battery pack includes a battery box and a plurality of battery cells disposed within the battery box. The battery box includes a base plate and an opening disposed opposite to the base plate. The at least two battery packs include an upper battery pack and a lower battery pack disposed adjacent to each other, and the battery box of the lower battery pack is configured to support the upper battery pack.

[0005] In the technical solution of this application embodiment, the upper battery pack is supported on the battery box of the lower battery pack. The weight of the upper battery pack is supported by the battery box of the lower battery pack, so there is no need to set up a special support frame, reducing the volume occupied by the support frame, and thus increasing the energy density of the battery device.

[0006] In some embodiments, the battery box of the upper battery pack closes to the opening of the battery box of the lower battery pack. The upper battery pack's battery box serves as the cover for the lower battery pack's battery box, making the battery device structure more compact and further improving energy density. Furthermore, by reducing the number of covers, the stacking gaps between battery packs are reduced, allowing for an increase in the number of battery packs within the same container size, thereby increasing the container's energy density and improving the amount of electricity stored per container.

[0007] In some embodiments, the battery device further includes a cover. The cover is disposed at the opening of the top battery pack located at the top of at least two battery packs. In the battery device of this application embodiment, the topmost battery pack located at the top of at least two battery packs is sealed by a separate cover, thereby ensuring the airtightness of the individual battery cells within the battery device.

[0008] In some embodiments, the battery box further includes a limiting structure. The limiting structure is configured to limit the relative positions of the upper battery pack and the lower battery pack in a first direction and / or a second direction. The battery box of this application embodiment is provided with a limiting structure, which limits the relative positions of the upper battery pack and the lower battery pack in the first direction and / or the second direction. This allows the upper battery pack to be stably and reliably limited on the lower battery pack, preventing positional displacement of the battery pack and thus improving the positional stability of the battery pack.

[0009] In some embodiments, the limiting structure includes a limiting protrusion and a limiting groove that fit together. When the upper battery pack and the lower battery pack are stacked, the limiting protrusion is inserted into the limiting groove. The electrical device of this application embodiment, by providing a limiting structure, uses the limiting protrusion and limiting groove that fit together. Thus, when stacking battery packs, the limiting protrusion and limiting groove, positioned opposite each other and fitting together, can achieve a limiting function. Furthermore, the limiting protrusion and limiting groove can also serve a positioning function.

[0010] In some embodiments, a limiting protrusion is formed at the end of the battery box near the opening, and a limiting groove is formed at the end of the battery box away from the opening. When the upper and lower battery packs are stacked, the limiting protrusion of the lower battery pack is inserted into the limiting groove of the upper battery pack. By forming the limiting protrusion at the end of the battery box near the opening and the limiting groove at the end away from the opening, the bottom of the battery box has no protrusion, thus allowing it to be stably placed within the electrical device or container. Furthermore, this allows the battery boxes of multiple battery packs in the embodiments of this application to be standardized, with the bottommost battery box having a groove at its bottom, thus avoiding any interlocking fit with other battery packs and ensuring stable placement.

[0011] In some embodiments, the battery box further includes a side plate extending circumferentially along the base plate. The side plate and the base plate together form a receiving cavity for placing multiple battery cells. Limiting protrusions and limiting grooves are formed at both ends of the side plate, respectively. This ensures that when two battery packs are stacked vertically, the positions of the side plates of the two battery packs correspond, allowing the limiting protrusions and limiting grooves at corresponding positions to form a convex-concave fit, thereby achieving a limiting function.

[0012] In some embodiments, the limiting protrusion includes an annular protrusion extending circumferentially along the battery pack, and the limiting groove includes an annular groove extending circumferentially along the battery pack. When the upper and lower battery packs are stacked, the annular protrusion of the lower battery pack is inserted into the annular groove of the upper battery pack. This achieves a limiting effect throughout the entire circumference of the battery pack, further improving the positional reliability of the battery pack. Moreover, from an installation perspective, when stacking battery packs, the annular groove of the upper battery pack can be directly aligned with the annular protrusion of the lower battery pack for insertion, avoiding repeated positioning and thus improving assembly efficiency.

[0013] In some embodiments, the battery pack further includes a first connecting surface disposed on the side of the annular protrusion near the battery cell and a second connecting surface disposed on the side of the annular groove near the battery cell. The annular protrusion of the lower battery pack is inserted into the annular groove of the upper battery pack, and the first connecting surface and the second connecting surface are connected. In this embodiment, the upper and lower battery packs are not only limited by the interlocking fit between the annular protrusion and the annular groove, but also fixedly connected by the connection between the first and second connecting surfaces. This makes the connection between the upper and lower battery packs more reliable and improves operational reliability.

[0014] In some embodiments, the first connecting surface and the second connecting surface are configured to be bonded together by adhesive or connected by a connector.

[0015] In some embodiments, the battery pack further includes a sealing gasket disposed between the first connecting surface and the second connecting surface. By providing a sealing gasket between the first connecting surface and the second connecting surface, the sealing performance of each battery pack is improved.

[0016] In some embodiments, the battery box is integrally molded. This integral molding process results in a faster production cycle, accelerating the overall production pace of the battery assembly and improving production efficiency.

[0017] In some embodiments, the battery box further includes a side plate extending circumferentially along the base plate, the side plate including an edge plate located at the circumferential edge and reinforcing ribs disposed within the edge plate. The reinforcing ribs are provided to improve the strength of the battery box.

[0018] A second aspect of this application provides an energy storage container, including a container body and the aforementioned battery device.

[0019] A third aspect of this application provides an electrical device including the aforementioned battery device, the battery device being used to provide electrical energy to the electrical device.

[0020] In some embodiments, the electrical device includes a vehicle, the battery device is disposed in the chassis of the vehicle, and the floor of the vehicle is disposed at the opening of the top battery pack located at the top of at least two battery packs to cover the opening of the top battery pack.

[0021] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application 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 the drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure of an electrical device according to some embodiments of this application.

[0024] Figure 2 This is a partial structural schematic diagram of an energy storage container according to some embodiments of this application.

[0025] Figure 3 This is a three-dimensional structural schematic diagram of a battery device according to some embodiments of this application.

[0026] Figure 4 yes Figure 3 The diagram shows an exploded view of the battery device.

[0027] Figure 5 yes Figure 3 The diagram shows a cross-sectional view of the battery device.

[0028] Figure 6 yes Figure 3 The diagram shows the structure of the battery pack of the battery device.

[0029] Figure 7 yes Figure 6 The diagram shows a cross-sectional view of the battery box.

[0030] The accompanying drawings are not drawn to scale.

[0031] 300. Vehicles.

[0032] 1000, Energy storage containers.

[0033] 200. Container body.

[0034] 100. Battery device.

[0035] 10. Battery pack; 11. Battery box; 111. Base plate; 112. Side plate; 1121. Annular protrusion; 1122. Annular groove; 1123. First connecting surface; 1124. Second connecting surface; 112a. Side plate; 112b. Reinforcing rib; 113. Opening; 12. Battery cell; 13. Sealing gasket; 131. Connecting hole.

[0036] 20. Cover.

[0037] X, first direction; Y, second direction; Z, altitude direction. Detailed Implementation

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0039] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0040] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0041] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0042] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0043] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0044] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0045] refer to Figure 1 This application provides an electrical device that uses a battery device 100 as a power source. The electrical device includes the battery device 100 and a drive device for providing driving force to the device; the battery device 100 provides electrical energy to the drive device. The driving force of the device can be entirely electrical energy, or partially electrical energy and partially other energy sources (e.g., mechanical energy). For example, the device may also include a power source that provides mechanical energy, such as an engine. Any device that uses the battery device 100 as a power source is within the scope of protection of this application.

[0046] The electrical device in this application embodiment can be a mobile device such as a vehicle, ship, or small aircraft. Taking a vehicle as an example, the vehicle in this application embodiment can be a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle, or a range-extended electric vehicle. Figure 1 A vehicle 300 is shown that uses a battery device 100 as a power source. The battery device 100 is disposed within the vehicle 300. A drive motor is disposed within the vehicle 300, and the drive motor is electrically connected to the battery device 100. The battery device 100 provides electrical energy to the drive motor, which is connected to the wheels via a transmission mechanism to drive the vehicle. Specifically, the battery device 100 may be horizontally disposed at the bottom of the vehicle 300.

[0047] refer to Figure 2 Other embodiments of this application provide an energy storage container 1000. The energy storage container 1000 includes a container body 200 and a battery device 100 disposed within the container body 200.

[0048] The energy storage container of the relevant technology has a support frame inside the container body 200 to support the battery packs. Each battery pack is supported on the support frame, which occupies part of the space inside the container body 200, making the internal space of the container body 200 ineffective and resulting in low space utilization and low energy density of the energy storage container. Moreover, the frame structure inside the container body is complex, which results in many assembly processes and heavy weight.

[0049] To address this problem, this application proposes a battery device 100, which includes at least two battery packs 10 stacked in the height direction Z. Except for the bottom battery pack at the lowest end, all other battery packs 10 are directly supported on the bottom battery pack, thereby eliminating the need for a dedicated support frame, reducing the space occupied by the support frame, and thus increasing the energy density of the battery device 100.

[0050] refer to Figures 3 to 5 The battery pack 10 of this application embodiment includes at least one battery cell 12. The battery cell 12 may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc. This application embodiment is not limited to these types. Multiple battery cells 12 are electrically connected via connecting tabs. The multiple battery cells 12 connected by the connecting tabs can be connected in series, in parallel, or in a mixed connection. The battery cell 12 includes a casing, end caps, electrode assemblies, and other functional components. The end caps close to the opening of the casing to form a receiving cavity. The receiving cavity contains the electrode assembly, electrolyte, and other components. The electrode assembly is the component in the battery cell where the electrochemical reaction occurs. The casing may contain one or more electrode assemblies. The electrode assembly is mainly formed by winding or stacking positive and negative electrode sheets. During the charging and discharging process of the battery, the positive and negative active materials react with the electrolyte, and the tabs connect to the terminals to form a current loop. The electrode assembly can be a wound structure or a stacked structure; this disclosure embodiment is not limited to these.

[0051] The following is for reference. Figures 3 to 7 The structure of the battery device 100 according to some embodiments of this application will be described in detail.

[0052] refer to Figures 3 to 5The battery device 100 provided in some embodiments of this application includes at least two battery packs 10. The at least two battery packs 10 are stacked in the height direction Z. Each battery pack 10 includes a battery case 11 and a plurality of individual battery cells 12 disposed within the battery case 11. The battery case 11 includes a base plate 111 and an opening opposite to the base plate 111. The at least two battery packs 10 include an upper battery pack and a lower battery pack disposed adjacent to each other. The battery case 11 of the lower battery pack is used to support the upper battery pack.

[0053] refer to Figure 3 In some embodiments of this application, the battery device 100 includes at least two battery packs 10 stacked in the height direction Z. The at least two battery packs 10 are stacked in the height direction Z, and the weight of the upper battery pack is directly supported by the lower battery pack located below. Figure 3 The battery device 100 is illustrated by way of example, comprising a three-layer battery pack stacked in the height direction Z. In other embodiments not shown in the figures, the battery device 100 may also comprise a two-layer battery pack or a battery pack with four or more layers stacked in the height direction Z.

[0054] refer to Figure 4 and Figure 5 Each battery pack 10 includes a battery case 11 and a plurality of battery cells 12 disposed within the battery case 11. The plurality of battery cells 12 are arranged in an array within the battery case 11. The battery case 11 has a receiving cavity in which the plurality of battery cells 12 are disposed. (Reference) Figure 6 The battery box 11 includes a base plate 111 and side plates 112 extending circumferentially along the base plate 111. The side plates 112 are disposed substantially perpendicular to the base plate 111, so that the side plates 112 and the base plate 111 together enclose a receiving cavity. The side plates 112 extend circumferentially along the base plate 111 to form an annular structure. In one embodiment, the battery box 11 is a square box, and the side plates 112 are square annular structures. In another embodiment, the side plates 112 may also be circular annular structures, and this application embodiment does not limit this.

[0055] In this embodiment of the application, at least two battery packs 10 are stacked in the height direction Z. Each pair of battery packs 10 is located in an upper-lower layer relationship. Adjacent upper and lower battery packs are relative; the same battery pack can be either an upper or lower battery pack. For example, for... Figure 3 and Figure 4 The battery device shown includes three battery packs. The second battery pack is considered the upper battery pack relative to the first battery pack, and the second battery pack is considered the lower battery pack relative to the third battery pack.

[0056] In the technical solution of this application embodiment, the upper battery pack is supported on the battery box 11 of the lower battery pack. The weight of the upper battery pack is supported by the battery box 11 of the lower battery pack, so there is no need to set up a special support frame, reducing the volume occupied by the support frame, and thus increasing the energy density of the battery device.

[0057] refer to Figure 4 and Figure 5 In some embodiments, the battery box 11 of the upper battery pack covers the opening of the battery box 11 of the lower battery pack.

[0058] The battery box 11 of the battery pack 10 has an opening 113 opposite to the base plate 111. In this embodiment, at least two battery packs 10 are stacked in the height direction Z, with the upper battery pack supporting the battery box 11 of the lower battery pack and covering the opening 113 of the lower battery box 11. That is, the battery box 11 of the upper battery pack forms the top cover of the battery box 11 of the lower battery pack, making the battery device structure more compact and further improving energy density. Furthermore, by reducing the number of top covers, the stacking gap between the battery packs is reduced, allowing for an increase in the number of battery packs within the same size container body, thereby increasing the energy density of the container and improving the storage capacity per container.

[0059] In this embodiment of the battery device, the battery box of the upper battery pack closes to the opening of the battery box of the lower battery pack to form the upper cover of the lower battery pack. Therefore, for the topmost battery pack, which has no other battery pack above it, in some embodiments, the battery device further includes a cover 20 to seal it. The cover 20 is disposed at the opening of the topmost battery pack among at least two battery packs 10.

[0060] In the battery device of this application embodiment, the topmost battery pack in at least two battery packs is sealed by a separate cover 20, thereby ensuring the airtightness of the individual battery cells inside the battery device.

[0061] In this embodiment of the battery device, at least two battery packs are stacked in the height direction, with the upper battery pack directly supported on the battery box of the lower battery pack. To prevent the battery packs from shifting during operation and affecting normal operation, in some embodiments, the battery box 11 further includes a limiting structure. The limiting structure is configured to limit the relative positions of the upper and lower battery packs in a first direction X and / or a second direction Y.

[0062] The first direction X and the second direction Y are perpendicular to each other and both are perpendicular to the height direction Z.

[0063] The battery box 11 in this embodiment of the application is provided with a limiting structure. The limiting structure is used to limit the relative position of the upper battery pack and the lower battery pack in the first direction X and / or the second direction Y. This allows the upper battery pack to be stably and reliably limited on the lower battery pack, preventing the position of the battery pack from shifting, thereby improving the positional stability of the battery pack.

[0064] In some embodiments, the limiting structure includes a limiting protrusion and a limiting groove that fit together. When the upper battery pack and the lower battery pack are stacked, the limiting protrusion is inserted into the limiting groove.

[0065] refer to Figure 5 ,exist Figure 5 In the specific embodiment shown, the limiting protrusion includes an annular protrusion 1121, and the limiting groove includes an annular groove 1122. When the upper battery pack and the lower battery pack are stacked, the annular protrusion 1121 extends into the annular groove 1122 to achieve limiting. Of course, in other embodiments not shown in the figures, the arrangement of the limiting protrusion can also be of other types, as long as it can achieve the limiting function.

[0066] The electrical device in this application embodiment has a limiting structure. By using limiting protrusions and limiting grooves that fit together, the device can limit the battery pack when stacking it by setting the corresponding limiting protrusions and limiting grooves relative to each other and fitting together. In addition, the limiting protrusions and limiting grooves can also play a positioning role.

[0067] In some embodiments, a limiting protrusion is formed at one end of the battery pack 11 near the opening 113. A limiting groove is formed at one end of the battery pack 11 away from the opening 113. When the upper battery pack and the lower battery pack are stacked, the limiting protrusion of the lower battery pack is inserted into the limiting groove of the upper battery pack.

[0068] Specifically, refer to Figure 6 and Figure 7 The battery box 11 includes a base plate 111 located at the bottom end of the battery box 11, and an opening 113 located opposite the base plate 111 at the top end of the battery box 11. A limiting protrusion formed at the end of the battery box 11 near the opening 113 means that the limiting protrusion is formed at the top end of the battery box 11. A limiting groove formed at the end of the battery box 11 away from the opening 113 means that the limiting groove is formed at the bottom end of the battery box 11.

[0069] The power device of this application embodiment forms a limiting protrusion at the end of the battery box 11 near the opening, and a limiting groove at the end of the battery box 11 away from the opening. This eliminates the protrusion at the bottom of the battery box 11, allowing it to be stably placed inside the power device or container. Furthermore, this allows the battery boxes of multiple battery packs in this application embodiment to be standardized. The bottommost battery box also has a groove at its bottom, ensuring stable placement without creating a convex-concave fit with other battery packs.

[0070] In some embodiments, the battery box 11 further includes a side plate 112 extending circumferentially along the base plate 111. The side plate 112 and the base plate 111 enclose a receiving cavity for placing a plurality of battery cells 12, and a limiting protrusion and a limiting groove are respectively formed at both ends of the side plate 112. In some embodiments, the limiting protrusion formed at the top end of the side plate 112 and the limiting groove formed at the bottom end of the side plate 112 mean that the top end and the bottom end of the side plate 112 are respectively formed by machining the limiting protrusion and the limiting groove, that is, the limiting protrusion and the limiting groove are integrally formed on the side plate 112.

[0071] refer to Figure 6 and Figure 7 The side plate 112 is disposed beside the base plate 111 and extends circumferentially along the base plate 111. A limiting protrusion is formed at the top of the side plate 112, and a limiting groove is formed at the bottom of the side plate 112.

[0072] This ensures that when the two battery packs are stacked one on top of the other, the positions of the side plates 112 of the two battery packs correspond, so that the limiting protrusions at the corresponding positions and the limiting grooves can form a concave-convex fit, thereby achieving the limiting function.

[0073] refer to Figure 6 and Figure 7 In some embodiments, the limiting protrusion includes an annular protrusion 1121 extending circumferentially along the battery pack 11. The limiting groove includes an annular groove 1122 extending circumferentially along the battery pack 11. When the upper battery pack and the lower battery pack are stacked, the annular protrusion 1121 of the lower battery pack is inserted into the annular groove 1122 of the upper battery pack.

[0074] refer to Figure 5When the upper and lower battery packs are stacked, the annular protrusion 1121 of the lower battery pack is inserted into the annular groove 1122 of the upper battery pack. In this embodiment, the battery box 11 has an annular protrusion 1121 extending circumferentially at its top, and correspondingly, an annular groove 1122 extending circumferentially at its bottom. This provides a limiting function throughout the entire circumferential direction of the battery box, further improving the positional reliability of the battery pack. Furthermore, from an installation perspective, when stacking battery packs, the annular groove 1122 of the upper battery pack can be directly aligned with the annular protrusion 1121 of the lower battery pack for insertion, avoiding repeated positioning and thus improving assembly efficiency.

[0075] refer to Figure 6 and Figure 7 In some embodiments, the battery pack 11 further includes a first connecting surface 1123 disposed on the side of the annular protrusion 1121 near the battery cell and a second connecting surface 1124 disposed on the side of the annular groove 1122 near the battery cell. The annular protrusion 1121 of the lower battery pack is inserted into the annular groove 1122 of the upper battery pack, and the first connecting surface 1123 and the second connecting surface 1124 are connected.

[0076] like Figure 6 As shown, the battery box 11 of this embodiment includes a base plate 111 and a side plate 112 extending circumferentially along the base plate 111. The side plate 112 and the base plate 111 enclose a receiving cavity for placing a plurality of battery cells 12. The top end of the side plate 112 is provided with an annular protrusion 1121 and a first connecting surface 1123 inside the annular protrusion 1121. Here, "inner side" refers to the side closer to the receiving cavity. The bottom end of the side plate 112 is provided with an annular groove 1122 and a second connecting surface 1124 inside the annular groove 1122. The positions of the annular groove 1122 and the annular protrusion 1121 are correspondingly arranged, so that the positions of the first connecting surface 1123 located inside the annular protrusion 1121 and the second connecting surface 1124 located inside the annular groove 1122 are correspondingly arranged, thereby realizing the connection between the battery box of the upper battery pack and the battery box of the lower battery pack.

[0077] Accordingly, in one specific embodiment, the first connecting surface 1123 is an annular connecting surface, and the second connecting surface 1124 is also an annular connecting surface.

[0078] In this embodiment, the upper and lower battery packs are not only limited by the interlocking of the annular protrusion 1121 and the annular groove 1122, but also fixedly connected by the connection between the first connecting surface 1123 and the second connecting surface 1124. This makes the connection between the upper and lower battery packs more reliable and improves operational reliability.

[0079] In some embodiments, the first connecting surface 1123 and the second connecting surface 1124 are configured to be bonded together by adhesive or connected by a connector.

[0080] exist Figure 6 In the specific embodiment shown, the first connecting surface 1123 and the second connecting surface 1124 are connected by a plurality of spaced-apart connectors. In other embodiments not shown in the figures, the first connecting surface and the second connecting surface may also be bonded together with adhesive.

[0081] refer to Figure 4 and Figure 5 In some embodiments, the battery pack 10 further includes a sealing gasket 13 disposed between the first connecting surface 1123 and the second connecting surface 1124.

[0082] Specifically, the sealing gasket 13 has a ring structure.

[0083] By providing a sealing gasket 13 between the first connection surface 1123 and the second connection surface 1124, the sealing performance of each battery pack is improved.

[0084] like Figure 5 As shown, the sealing gasket 13 is provided with a connection hole 131, which facilitates the connection between the first connection surface 1123 and the second connection surface 1124 by means of a connector. Specifically, the connector passes through the connection hole 131 to connect the first connection surface 1123 and the second connection surface 1124.

[0085] refer to Figures 5 to 7 The top surface of the side plate 112 is formed as a stepped surface, including an annular protrusion 1121 and a first connecting surface lower than the annular protrusion 1121. Therefore, the top surface of the battery box 11 is not flat. Specifically, the side plate 112 and the bottom plate 111 of the battery box 11 are both integrally formed. Further, the annular protrusion and the first connecting surface at the top of the side plate 112, as well as the annular groove and the second connecting surface at the bottom of the side plate 112, are all integrally formed.

[0086] In some embodiments, the battery box 11 is integrally formed.

[0087] In some embodiments, the battery box 11 is made of high-strength metals such as aluminum alloy, steel alloy, titanium alloy, or aerospace aluminum alloy, and can be integrally formed, for example, by die casting. In other embodiments, the battery box 11 is integrally formed by injection molding. The injection-molded battery box 11 has good insulation properties, and its density is much lower than that of metal, making its overall weight lighter than that of a metal box. The injection molding material is thermoplastic materials such as PP, PA6, PC, ABS, and PBT, as well as thermosetting materials, and strength additives such as fibers and talc are added according to the structural strength. To improve the strength of the injection-molded battery box 11, it can be reinforced by metal inserts and reinforcing ribs.

[0088] The battery box 11 is formed by a one-piece molding process, which has a fast production cycle, can speed up the production cycle of the entire battery device, and improve production efficiency.

[0089] As described in the above embodiments, the weight of the upper battery pack in this application embodiment is directly borne by the battery box of the lower battery pack. Therefore, the strength of the battery box needs to be greater to ensure it can bear the weight. To improve the strength of the battery box, such as... Figure 7 As shown, in some embodiments, the battery box 11 further includes a side plate 112 extending circumferentially along the base plate 111. The side plate 112 includes a side plate 112a located at the circumferential edge and a reinforcing rib 112b disposed within the side plate 112a.

[0090] The reinforcing ribs 112b are intersectingly arranged within the frame formed by the side plates 112a. Specifically, the reinforcing ribs 112b are arranged at an angle relative to the side plates 112a or are perpendicular to the side plates 112a.

[0091] In some embodiments, based on strength requirements, the wall thickness of the side plate 112a is greater than or equal to 2 mm, and a number of reinforcing ribs are provided to supplement the strength.

[0092] As can be seen from the descriptions of the above embodiments, the weight of the upper battery pack in this application embodiment is supported by the battery box of the lower battery pack; therefore, the strength of the battery box of the lower battery pack is particularly important. Since the battery box of the bottommost battery pack needs to support the weight of all the battery packs above it, the strength of the battery box of the bottom battery pack must be maximized.

[0093] To achieve standardized production and improve efficiency, in some embodiments, the structure of the battery box in each battery pack is the same as that of the battery box in the underlying battery pack. That is, the strength of the battery box in each battery pack is the same as that of the battery box in the underlying battery pack.

[0094] refer to Figure 2 This application provides an energy storage container 1000. The energy storage container 1000 includes a container body 200 and a battery device 100 disposed within the container body 200.

[0095] By installing the battery device 100 provided in this embodiment within the container body 200, the support frame installed within the container body 200 can be eliminated, thereby increasing the energy density within the container body. Furthermore, eliminating the support frame reduces the number of parts, streamlines production processes, and improves production efficiency.

[0096] refer to Figure 1This application also provides an electrical device that includes the battery device described in the above embodiments. The battery device is used to provide electrical energy to the electrical device.

[0097] Some embodiments of the electrical device include a vehicle. A battery assembly is disposed in the vehicle's chassis, and the vehicle's floor is positioned to cover the opening of the top-level battery pack, which is located at the top of at least two battery packs.

[0098] In other words, when the battery device of this application embodiment is used in a vehicle, the opening of the topmost battery pack directly covers the vehicle floor, and the vehicle floor forms a cover, thereby further reducing the weight of the battery device.

[0099] In some embodiments, the top of the battery box of the topmost battery pack can be made flat to better allow the vehicle floor to cover the battery box.

[0100] The following is based on Figures 2 to 7 The structure of an energy storage container 1000 according to a specific embodiment of this application will be described in detail.

[0101] like Figure 2 As shown, the energy storage container 1000 of this embodiment includes a container body 200 and at least two battery devices 100 disposed within the container body 200.

[0102] like Figures 3 to 5 As shown, each battery device 100 includes at least two battery packs 10 stacked in the height direction Z and a cover 20 covering the opening of the top battery pack. Each battery pack 10 includes a battery box 11, a plurality of battery cells 12 and a sealing gasket 13.

[0103] like Figures 3 to 5 As shown, at least two battery packs 10 are stacked in the height direction Z.

[0104] like Figure 5 and Figure 6 As shown, the battery box 11 includes a base plate 111 and a side plate 112. The side plate 112 extends circumferentially along the base plate 111. The side plate 112 includes an annular protrusion 1121 and a first connecting surface 1123 at the top end, and an annular groove 1122 and a second connecting surface 1124 at the bottom end.

[0105] When multiple battery packs 10 are stacked, the battery box 11 of the lower battery pack directly supports the upper battery pack. Specifically, the frame structure of the battery box, i.e., the side plate 112, is used for support. An annular protrusion 1121 is provided at the top of the side plate, and an annular groove 1122 is provided at the bottom of the side plate. During assembly, the battery box of the upper battery pack serves as the top cover of the lower battery pack. When it falls, the annular protrusion aligns with the annular groove, transferring the weight of the battery pack onto the frame of the lower battery pack. Furthermore, the battery boxes of the upper and lower battery packs can be bolted together, achieving both sealing and securing the upper and lower boxes. After complete stacking, frameless battery pack stacking can be achieved inside the container.

[0106] In some embodiments, an insulating buffer pad may be provided between the annular protrusion 1121 and the annular groove 1122 to absorb assembly tolerances and provide insulation.

[0107] The battery device in this embodiment relies on the high strength of the battery box itself to support the weight of the upper battery pack. The upper battery pack's battery box covers the opening of the lower battery pack's battery box to form a top cover, thus replacing the fixed frame and battery pack top cover inside the energy storage container. This reduces the number of internal frame components and top cover components, streamlines production processes, increases production speed, and lowers costs. The reduction in the internal frame allows the battery pack stacking gap to be reduced from hundreds of millimeters to just a few millimeters. Within the same standard container, this allows for an increase in the number of battery boxes, increasing the container's energy density and improving the storage capacity per box.

[0108] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized by, The battery device (100) comprises at least two battery packs (10) stacked in a height direction (Z), wherein each battery pack (10) comprises a battery box (11) and a plurality of battery cells (12) arranged in the battery box (11), and the battery box (11) comprises a bottom plate (111) and an opening (113) arranged opposite to the bottom plate (111). The at least two battery packs (10) comprise an upper battery pack and a lower battery pack arranged adjacently, and the battery box (11) of the lower battery pack is configured to carry the upper battery pack.

2. The battery device of claim 1, wherein The battery box (11) of the upper battery pack covers the opening (113) of the battery box of the lower battery pack.

3. The battery device of claim 1, wherein The battery device (100) further comprises a cover (20) arranged at the opening (113) of a top battery pack located at a top end of the at least two battery packs (10).

4. The battery device of claim 1, wherein The battery box (11) further comprises a limiting structure configured to limit the relative position of the upper battery pack and the lower battery pack in a first direction (X) and / or a second direction (Y).

5. The battery device of claim 4, wherein, The limiting structure comprises a limiting protrusion and a limiting groove in a concave-convex matching mode, and the limiting protrusion is arranged in the limiting groove when the upper battery pack and the lower battery pack are stacked.

6. The battery device of claim 5, wherein, The limiting protrusion is formed at one end of the battery box (11) close to the opening (113), and the limiting groove is formed at the other end of the battery box (11) away from the opening (113), and the limiting protrusion of the lower battery pack is arranged in the limiting groove of the upper battery pack when the upper battery pack and the lower battery pack are stacked.

7. The battery device of claim 6, wherein, The battery box (11) further comprises a side plate (112) extending along the circumference of the bottom plate (111), and the side plate (112) and the bottom plate (111) form an accommodating cavity for placing the plurality of battery cells (12), and the limiting protrusion and the limiting groove are formed at two ends of the side plate (112), respectively.

8. The battery device of claim 6, wherein, The limiting protrusion comprises an annular protrusion extending along the circumference of the battery box (11), and the limiting groove comprises an annular groove extending along the circumference of the battery box (11), and the annular protrusion of the lower battery pack is arranged in the annular groove of the upper battery pack when the upper battery pack and the lower battery pack are stacked.

9. The battery device of claim 8, wherein, The battery box (11) further comprises a first connecting surface arranged on the side of the annular protrusion close to the battery cell and a second connecting surface arranged on the side of the annular groove close to the battery cell, and the annular protrusion of the lower battery pack is arranged in the annular groove of the upper battery pack and the first connecting surface and the second connecting surface are connected.

10. The battery device of claim 9, wherein, The first connecting surface and the second connecting surface are configured to be connected by adhesive or a connecting member.

11. The battery device of claim 10, wherein, The battery pack (10) further comprises a sealing gasket (13) arranged between the first connecting surface and the second connecting surface.

12. The battery device according to any one of claims 1 to 11, characterized by, The battery box (11) is integrally formed.

13. The battery device according to any one of claims 1 to 11, wherein The battery box (11) further comprises a side plate (112) extending along the circumference of the bottom plate (111), the side plate (112) comprising a side edge plate (112a) at the circumferential edge and a reinforcing rib (112b) arranged in the side edge plate (112a).

14. An energy storage container, characterized by The battery device as claimed in any one of claims 1 to 13.

15. An electrical device, comprising: The battery device as claimed in any one of claims 1 to 13, wherein the battery device is used to provide electric energy for an electric device.

16. The powered device of claim 15, wherein, The electric device comprises a vehicle, and the battery device is arranged on a chassis of the vehicle, and a floor of the vehicle is arranged at an opening of a top layer battery pack among the at least two battery packs (10) located at the top end to cover the opening of the top layer battery pack.

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