Battery device, electric device, and energy storage device

Abstract

The application provides a battery device, a power consumption device and an energy storage device. The battery device comprises a battery cell assembly and a battery box. The battery box comprises a box body and a box cover. The box body and the box cover are combined to form a containing cavity. The battery cell assembly is contained in the containing cavity. An outer surface of the box body forms a recessed space which is recessed towards the containing cavity. The box cover forms a bending part which is bent towards the containing cavity. Part of the box cover covers the outer surface of the box body. The bending part extends into the recessed space. A connecting part is provided. Part of the connecting part passes through the bending part and a wall surface forming the recessed space and connects the bending part and the box body. Thus, a battery device with higher energy can be placed in a containing space for containing the battery device.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to battery devices, power consumption devices and energy storage devices. Background Technology

[0002] With the promotion and popularization of the concept of green development, new energy batteries are being used more and more widely in life and industry. For example, new energy vehicles equipped with batteries have been widely used. In addition, batteries are being used more and more in the field of energy storage.

[0003] Battery devices are typically placed in electrical appliances or energy storage devices to accommodate them. However, the space available is limited. Therefore, finding a way to fit higher-energy battery devices into that space is one of the research and development challenges. Utility Model Content

[0004] This application provides a battery device, an electrical device, and an energy storage device, which can place a higher energy battery device in a space used to house the battery device.

[0005] In a first aspect, this application provides a battery device, which includes a battery cell assembly and a battery case. The battery case includes: a case body and a case cover, which together form a receiving cavity. The battery cell assembly is received in the receiving cavity. The outer surface of the case body forms a recessed space that is recessed toward the receiving cavity. The case cover forms a bent portion that bends toward the receiving cavity. A portion of the case cover covers the outer surface of the case body, and the bent portion extends into the recessed space. A connector is also provided. A portion of the connector passes through the bent portion and the wall forming the recessed space and connects the bent portion to the case body.

[0006] Because the outer surface of the casing forms a recessed space facing the receiving cavity, and the bent portion of the casing cover extends into this recessed space, with the connector linking the bent portion to the casing, the portion of the connector located outside the casing cover can be situated within the recessed space. When the battery pack is placed within this receiving space, the gap between the battery pack and the boundary of the receiving space can be smaller, allowing for a larger overall size of the battery box. This also allows for a larger receiving cavity within the battery box to accommodate individual battery cells. Consequently, higher-energy battery cells can be installed within the battery box, thereby increasing the energy output of the battery pack in the electrical device or energy storage device. Furthermore, the connector links the casing and the casing cover, facilitating their assembly and disassembly.

[0007] In some embodiments, the box body and the box cover are closed along a first direction. The box cover includes two first cover walls that are opposite each other along a second direction. At least one of the first cover walls is formed with a bend. The first direction intersects with the second direction. The portion of the connector located on the side of the bend facing away from the box body is a first portion. In the same projection plane projected along the first direction, the projection of the first portion overlaps with the projection of the first cover wall.

[0008] Since the projection of the first part and the projection of the first cover wall overlap within the same projection plane along the first direction, the first part can share the space perpendicular to the first direction with the first cover wall. Therefore, with the limited space capacity, the size of the battery box can be set to be larger, thereby increasing the energy of the battery device.

[0009] In some embodiments, within the same projection plane projected along the first direction, the projection of the first portion lies within the range of the projections of the housing and the lid.

[0010] Since the projection of the first part is within the projection range of the box body and the box cover on the same projection plane along the first direction, the entire first part can share the space perpendicular to the first direction with the box body and the box cover. Therefore, with the limited space capacity, the size of the battery box can be set to be larger, thereby further improving the energy of the battery device.

[0011] In some embodiments, within the same projection plane projected along the second direction, the projection of the first portion lies within the range of the projections of the housing and the lid.

[0012] Since the projection of the first part is within the projection range of the box body and the box cover on the same projection plane along the second direction, the entire first part can share the space perpendicular to the second direction with the box body and the box cover. Therefore, with the limited space capacity of the battery compartment, the size of the battery box can be set to be larger, thereby further improving the energy of the battery device.

[0013] In some embodiments, at least one first cover wall includes a first cover portion and a second cover portion connected together, the first cover portion at least partially covering the outer surface of the housing, the second cover portion being bent relative to the first cover portion toward the receiving cavity, the bent portion including the second cover portion, at least a portion of the second cover portion being located in the recessed space, and along a first direction, a portion of the connector passes through the second cover portion and the housing and connects the second cover portion and the housing.

[0014] Since the connecting part passes through the second cover and the housing along the first direction and connects the second cover and the housing, the structure of the bending part is simple and easy to manufacture, and the connecting part can easily connect the second cover and the housing.

[0015] In some embodiments, at least one first cover wall includes a first cover portion, a second cover portion, and a third cover portion, the outer surface of the third cover portion being recessed toward the recessed space relative to the outer surface of the first cover portion, the second cover portion connecting the first cover portion and the third cover portion, the bending portion including the second cover portion and the third cover portion, and along a second direction, a portion of the connector passing through the third cover portion and the housing and connecting the third cover portion and the housing.

[0016] Since the connecting part passes through and connects the third cover and the box body along the second direction, the structure of the bending part is simple and easy to manufacture, and the connecting part can easily connect the third cover and the box body.

[0017] Because the connector can connect the housing and the cover in either the first or second direction, the flexibility in the connector's configuration is increased.

[0018] In some embodiments, along the second direction, the maximum dimension of the outer surface of the second cover portion is in the range of 3 mm to 18 mm.

[0019] Therefore, along the second direction, the recessed space can almost accommodate the entire first part, so the size of the gap between the battery device and the boundary of the accommodating space can be further reduced, which can further improve the energy of the battery device.

[0020] In some embodiments, the maximum dimension of the outer surface of the third cover portion is greater than 8 mm along the first direction.

[0021] Therefore, along the first direction, the recessed space can almost accommodate the entire first part, so the size of the gap between the battery device and the boundary of the accommodating space can be further reduced, which can further improve the energy of the battery device.

[0022] In some embodiments, the box body includes two first box walls opposite each other along a second direction. At least one first box wall includes a first box portion, a second box portion, and a third box portion. The first box portion and the third box portion are respectively connected to the two sides of the second box portion along a first direction. A recessed space is formed between the outer surfaces of the second box portion and the outer surfaces of the third box portion. At least a portion of the first cover portion covers the outer surface of the first box portion, and at least a portion of the second cover portion covers the outer surface of the second box portion. Along the second direction, the end of the second cover portion away from the first cover portion is the end of the box cover.

[0023] Therefore, the bending section has a simple structure and is easy to manufacture. Moreover, the first cover at least partially covers the outer surface of the first box, and the second cover at least partially covers the outer surface of the second box. Thus, the connection between the box and the cover can form a labyrinth-like sealing structure, which can improve the sealing performance of the connection between the box and the cover, thereby improving the sealing performance of the battery device and its waterproof and dustproof performance.

[0024] In other embodiments, at least one first cover wall further includes a third cover portion, the outer surface of the third cover portion being recessed toward the recessed space relative to the outer surface of the first cover portion, a second cover portion connecting the first cover portion and the third cover portion, a bent portion including the second cover portion and the third cover portion, a box body including two first box walls opposite each other along a second direction, at least one first box wall including a first box portion, a second box portion and a third box portion, the first box portion and the third box portion respectively connected to the two sides of the second box portion along a first direction, a recessed space being formed between the outer surfaces of the second box portion and the outer surfaces of the third box portion, at least a portion of the first cover portion covering the outer surface of the first box portion, at least a portion of the second cover portion covering the outer surface of the second box portion, at least a portion of the third cover portion covering the outer surface of the third box portion, and along the first direction, the end of the third cover portion away from the second cover portion is the end of the box cover.

[0025] Since the first cover at least partially covers the outer surface of the first housing, the second cover at least partially covers the outer surface of the second housing, and the third cover at least partially covers the outer surface of the third housing, a labyrinth-like sealing structure can be formed at the connection between the housing and the cover. This improves the sealing performance at the connection between the housing and the cover, thereby enhancing the sealing performance of the battery device and its waterproof and dustproof capabilities. Furthermore, since the end of the third cover furthest from the second cover along the first direction is the end of the cover, a bend can be formed at the end of the first cover wall along the first direction, resulting in a simple structure that is easy to manufacture.

[0026] In some other embodiments, at least one first cover wall further includes a third cover portion and a fourth cover portion, the third cover portion connecting the second cover portion and the fourth cover portion, the outer surfaces of the second cover portion, the third cover portion and the fourth cover portion forming a groove recessed toward the receiving cavity, the bent portion including the second cover portion, the third cover portion and the fourth cover portion, the housing including two first housing walls opposite each other along a second direction, at least one first housing wall including a first housing portion, a second housing portion, a third housing portion and a fourth housing portion, the second housing portion connecting the first housing portion and the third housing portion, the third housing portion connecting the second housing portion and the fourth housing portion, the outer surfaces of the second housing portion, the third housing portion and the fourth housing portion forming a groove-shaped recessed space, at least a portion of the first cover portion covering the outer surface of the first housing portion, at least a portion of the second cover portion covering the outer surface of the second housing portion, at least a portion of the third cover portion covering the outer surface of the third housing portion, and at least a portion of the fourth cover portion covering the outer surface of the fourth housing portion.

[0027] Since the first cover at least partially covers the outer surface of the first box, the second cover at least partially covers the outer surface of the second box, the third cover at least partially covers the outer surface of the third box, and the fourth cover at least partially covers the outer surface of the fourth box, the connection between the box and the cover can form a labyrinth-like sealing structure, which can improve the sealing performance of the connection between the box and the cover, thereby improving the sealing performance of the battery device and improving the waterproof and dustproof performance of the battery device.

[0028] Therefore, the various forms of the bending section can increase the design freedom of the bending section, and thus increase the design freedom of the battery device.

[0029] In some embodiments, the enclosure includes two first enclosure walls facing each other along a second direction. At least one first enclosure wall includes a first enclosure portion, a second enclosure portion, and a third enclosure portion. The first enclosure portion and the third enclosure portion are respectively connected to the two sides of the second enclosure portion along a first direction. A recessed space is formed between the outer surfaces of the second enclosure portion and the outer surfaces of the third enclosure portion. The enclosure also includes a second enclosure wall. The two ends of the second enclosure wall facing each other along the second direction are respectively connected to the third enclosure portions of the two first enclosure walls. The wall thickness direction of the second enclosure wall is the same as that of the first direction.

[0030] Since the two opposite ends of the second box wall along the second direction are respectively connected to the third box section of the two first box walls, the box body can be formed with a simple structure.

[0031] In some embodiments, at least one first box wall further includes a fourth box portion, the second box portion and the fourth box portion being respectively connected to both sides of the third box portion along the second direction, and along the first direction, a portion of the outer surface of the second box wall abuts against the inner surface of the fourth box portion.

[0032] Since the outer surface of part of the second box wall abuts against the inner surface of the fourth box section along the first direction, the fourth box section can support the second box wall, thereby increasing the connection strength between the first box wall and the second box wall and reducing the probability of the connection between the first box wall and the second box wall breaking.

[0033] In some embodiments, the end of the third box portion away from the second box portion is the end of the first box wall.

[0034] It has a simple structure and is easy to manufacture and assemble.

[0035] In some embodiments, the housing includes two first housing walls opposite each other along a second direction. At least one first housing wall includes a first housing portion, a second housing portion, and a third housing portion. The second housing portion connects the first housing portion and the third housing portion. A recessed space is formed between the outer surfaces of the second housing portion and the outer surfaces of the third housing portion. At least a first cover portion covers the outer surface of the first housing portion, and at least a second cover portion covers the outer surface of the second housing portion. Along the second direction, one end of the second housing portion facing the first cover portion abuts against the inner surface of the first cover portion; and along the second direction, one end of the second cover portion facing the third housing portion abuts against the outer surface of the third housing portion.

[0036] Since the end of the second box portion facing the first cover portion abuts against the inner surface of the first cover portion along the second direction, and the end of the second cover portion facing the third box portion abuts against the outer surface of the third box portion along the second direction, positioning of the box body and the cover portion along the second direction can be achieved, facilitating the connection of the box body and the cover portion by the connector.

[0037] In some embodiments, the lid includes a second cover wall that connects two first cover walls that are opposite each other along a second direction. The wall thickness direction of the second cover wall is the same as that of the first direction. Along the first direction, the two ends of the first box portion abut against the inner surface of the second cover wall and the inner surface of the second cover portion, respectively.

[0038] Since the two ends of the first box part abut against the inner surface of the second cover wall and the inner surface of the second cover part respectively along the first direction, the positioning between the box body and the box cover along the first direction can be achieved, which facilitates the connection of the box body and the box cover by the connector.

[0039] In some embodiments, one of the side of the first box wall facing the first cover wall and the side of the first cover wall facing the first box wall has a protrusion, and the other has a groove, with the protrusion located within the groove.

[0040] Because the protrusion is located within the groove, when the box body and the lid are connected, the protrusion and the groove can position the relative positions of the box body and the lid, which facilitates the assembly of the box body and the lid and makes it easier for the connectors to connect the box body and the lid.

[0041] In some embodiments, the battery box further includes two end plates facing each other along a third direction; the box cover includes a second cover wall, which connects two first cover walls facing each other along a second direction; the box body includes two first box walls facing each other along a second direction and a second box wall connecting the first box walls facing each other along a second direction, the second cover wall and the second box wall are disposed facing each other along a first direction, at least a portion of the first cover wall covers the outer surface of the first box wall, the two ends of the end plate along the first direction are respectively connected to the second cover wall and the second box wall, and the two ends of the end plate along the second direction are respectively connected to the first cover wall facing each other along the second direction, the first direction, the second direction and the third direction intersect each other and are not coplanar.

[0042] Therefore, the end plate can at least partially cover the two end faces of the battery cell module along the third direction, which can reduce the probability of the battery cell module being affected by external factors.

[0043] In some embodiments, the lid is a one-piece molded structure.

[0044] This reduces the number of parts and improves the assembly efficiency of battery devices.

[0045] Secondly, embodiments of this application also provide an electrical device, which includes the battery device provided in the first aspect of embodiments of this application. The battery device is used to store electrical energy and supply power to the electrical device.

[0046] This can increase the energy of the battery in the electrical device, thereby increasing the device's range of operation.

[0047] Thirdly, embodiments of this application also provide an energy storage device, which includes the battery device provided in the first aspect of embodiments of this application. The battery device is used to store electrical energy and provide electrical energy.

[0048] This can increase the energy of the battery devices in the energy storage device, thereby increasing the energy storage capacity of the energy storage device. Attached Figure Description

[0049] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 Structural schematic diagrams of vehicles provided for some embodiments of this application; Figure 2 Schematic diagrams of the battery device provided for some embodiments of this application; Figure 3 An exploded view of the battery box provided for some embodiments of this application; Figure 4 Cross-sectional structural schematic diagram of a battery device provided for some embodiments of this application; Figure 5 Cross-sectional structural schematic diagrams of parts of the battery box and connectors provided for some embodiments of this application; Figure 6 Cross-sectional structural schematic diagrams of parts of the battery box and connectors provided for other embodiments of this application; Figure 7 A cross-sectional structural schematic diagram of a portion of the battery box and a connector provided for further embodiments of this application; Figure 8A cross-sectional structural schematic diagram of a portion of the battery box and connectors provided for further embodiments of this application; Figure 9 A cross-sectional structural diagram of a portion of the battery box and a connector provided for further embodiments of this application; Figure 10 A cross-sectional structural schematic diagram of a portion of the battery box and a connector provided for further embodiments of this application; Figure 11 A cross-sectional structural schematic diagram of a portion of the battery box and a connector provided for some other embodiments of this application; Figure 12 A cross-sectional structural schematic diagram of a portion of the battery box and a connector provided for further embodiments of this application; Figure 13 This is a structural schematic diagram of a battery device provided for some embodiments of this application from another angle.

[0050] Explanation of reference numerals in the attached figures 1. Battery assembly; 2. Controller; 3. Motor; 11. Battery cell assembly; 111. Battery cell; 12. Battery box; 121. Box cover; 1211. Bending part; 1212. First cover wall; M1. First cover part; M2. Second cover part; M3. Third cover part; M4. Fourth cover part; 1213. Second cover wall; 122. Box body; 1221. Recessed space; 1222. First box wall; N1. First box part; N2. Second box part; N3. Third box part; N4. Fourth box part; 1223. Second box wall; Q. Protrusion; 123. Receiving cavity; 124. End plate; 13. Connector; 131. First part; 14. Bearing beam; X. First direction; Y. Second direction; Z. Third direction. Detailed Implementation

[0051] It should be noted that, unless otherwise specified, the embodiments and technical features in the embodiments of this application can be combined with each other, and the detailed descriptions in the specific implementation should be understood as explanations of the purpose of this application and should not be regarded as undue limitations on this application.

[0052] 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 belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit this application; the terms “comprising” and “having”, and any variations thereof, in the specification and the foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0053] In the description of this application, the technical terms "first," "second," "third," "fourth," "fifth," etc., 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 or secondary relationship of the indicated technical features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly defined.

[0054] 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.

[0055] In the description of 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, or B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects are in an "or" relationship.

[0056] In the description of the embodiments of this application, the technical terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed, operated or used in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0057] In the description of this application, unless otherwise expressly specified and limited, the technical terms "installation," "connection," "joining," "fixing," etc., 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. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0058] In the description of this application, unless otherwise expressly specified and limited, the technical term "contact" shall be interpreted broadly, and may refer to direct contact, contact through an intermediate medium, contact between two contacting parties with substantially no interaction force, or contact between two contacting parties with interaction force.

[0059] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms "parallel" and "perpendicular" are both allowed to have a certain degree of tolerance and / or error, including cases of being approximately parallel and approximately perpendicular.

[0060] The embodiments of this application will now be described in detail.

[0061] Battery devices are typically placed in the storage space within electrical devices or energy storage devices. Since the space within these storage spaces is limited, finding ways to accommodate higher-energy battery devices within that space is one of the research and development topics.

[0062] In related technologies, battery devices typically include a battery box and connectors. The battery box includes a box body and a box cover. The connectors connect the box body and the box cover. The portion of the connector located outside the box cover usually protrudes relative to the outer surface of the box cover. When the battery device is placed in the housing space, the box body, box cover, and connectors need to avoid the boundary of the housing space.

[0063] Research has shown that because the portion of the connector located outside the cover protrudes relative to the outer surface of the cover, space needs to be left between the boundary of the receiving space and the cover to accommodate the connector. This results in a larger distance between the cover and the boundary of the receiving space, a smaller battery box size, and consequently, less energy in the battery device. To address this, the cover can be formed with a bent portion that bends towards the receiving cavity. This bent portion can extend into the recessed space, and the connector connects the bent portion to the box body. Therefore, at least a portion of the connector located outside the cover can be placed in the recessed space, reducing the volume of the portion of the connector outside the cover that protrudes relative to the cover. As a result, the gap between the cover and the boundary of the receiving space can be made smaller, thereby increasing the size of the battery box and thus improving the energy of the battery device.

[0064] Based on this technical concept, this application provides a battery device, which includes a battery cell assembly and a battery case. The battery case includes: a case body and a case cover, which together form a receiving cavity. The battery cell assembly is received in the receiving cavity. The outer surface of the case body forms a recessed space that is recessed toward the receiving cavity. The case cover forms a bent portion that bends toward the receiving cavity. A portion of the case cover covers the outer surface of the case body, and the bent portion extends into the recessed space. A connector is also provided. A portion of the connector passes through the bent portion and the wall forming the recessed space and connects the bent portion to the case body.

[0065] Because the outer surface of the casing forms a recessed space facing the receiving cavity, and the bent portion of the casing cover extends into this recessed space, with the connector linking the bent portion to the casing, the portion of the connector located outside the casing cover can be situated within the recessed space. When the battery pack is placed within this receiving space, the gap between the battery pack and the boundary of the receiving space can be smaller, allowing for a larger overall size of the battery box. This also allows for a larger receiving cavity within the battery box to accommodate individual battery cells. Consequently, higher-energy battery cells can be installed within the battery box, thereby increasing the energy output of the battery pack in the electrical device or energy storage device. Furthermore, the connector links the casing and the casing cover, facilitating their assembly and disassembly.

[0066] The battery device provided in this application embodiment can be used, but is not limited to, in electrical devices such as energy storage devices, vehicles, ships, robots, or aircraft.

[0067] This application also provides an electrical device including the aforementioned battery device. The electrical device can be, but is not limited to, a mobile phone, tablet, laptop, electric toy, power tool, electric vehicle, electric car, ship, spacecraft, low-altitude aircraft, robot, etc. Among them, electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0068] This application also provides an energy storage device including the above-mentioned battery device, the energy storage device including energy storage container, energy storage cabinet, etc.

[0069] For ease of explanation, an example of an electrical device according to one embodiment of this application is a vehicle. The following description is in conjunction with the accompanying drawings.

[0070] Figure 1 The diagram illustrates the structure of a vehicle as provided in some embodiments of this application. The vehicle can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended vehicles, etc. Figure 1 As shown, a battery device 1 is installed inside the vehicle. The battery device 1 can be located at the bottom, front, or rear of the vehicle. The battery device 1 can be used to power the vehicle; for example, the battery device 1 can serve as the vehicle's operating power source. The vehicle may also include a controller 2 and a motor 3. The controller 2 is used to control the battery device 1 to supply power to the motor 3, for example, to meet the power needs of the vehicle during starting, navigation, and driving.

[0071] In some embodiments, the vehicle has a receiving space for accommodating a battery device 1, the boundary of the receiving space surrounding the space forming the receiving space for accommodating the battery device 1, and a gap between the outer surface of the battery device 1 and the boundary of the receiving space to allow the battery device 1 to be placed into or removed from the receiving space.

[0072] In some embodiments of this application, the battery device 1 can not only serve as the operating power source for the vehicle, but also as the driving power source for the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0073] Figure 2 This is a schematic diagram of the structure of a battery device 1 provided for some embodiments of this application.

[0074] The battery device 1 mentioned in the embodiments of this application may include one or more battery cell assemblies 11 (see reference 1). Figure 4 The battery cell assembly 11 is used to provide voltage and capacity. It may include multiple battery cells 111, which are connected in series, parallel, or mixed connections via a busbar (not shown). The electrical connection of multiple battery cells 111 forms a power supply circuit, and connecting the electric vehicle's motor 3 or other electrical appliances to this power supply circuit forms an electrical loop.

[0075] In some embodiments, the battery cell assembly 11 is typically formed by arranging a plurality of battery cells 111.

[0076] As an example, multiple battery cell assemblies 11 can constitute a battery module. A battery cell assembly 11 is formed by arranging and fixing multiple battery cells 111 together to form an independent module. Sometimes, a battery module is also referred to as a battery assembly. As an example, a battery cell assembly 11 can be formed by bundling multiple battery cells 111 together with cable ties. In some cases, for ease of illustration, two or more adjacently arranged battery cell assemblies 11 are considered as a single battery module.

[0077] In some embodiments, such as Figure 2 As shown, the battery device 1 can be a battery pack, which includes a battery case 12 and a plurality of battery cell assemblies 11, with the battery cell assemblies 11 housed in the battery case 12.

[0078] In this embodiment of the application, the battery cell 111 can be a secondary battery. A secondary battery refers to a battery cell 111 that can be used again after being discharged by recharging to activate the active material.

[0079] The battery cell 111 can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0080] Below, in conjunction with Figures 3 to 13 Some embodiments of this application will be described in detail.

[0081] In the description of the embodiments of this application, for ease of explanation, the direction of arrow X represents the "first direction", the direction of arrow Y represents the "second direction", and the direction of arrow Z represents the "third direction". The first direction X, the second direction Y, and the third direction Z intersect each other and are not coplanar. In some embodiments, the first direction X, the second direction Y, and the third direction Z are perpendicular to each other.

[0082] Firstly, this application provides a battery device 1, such as Figures 2 to 11 As shown, the battery device 1 includes a battery cell assembly 11 and a battery case 12. The battery case 12 includes a case body 122, a case cover 121, and a connector 13. The case body 122 and the case cover 121 together form a receiving cavity 123, in which the battery cell assembly 11 is received. The outer surface of the case body 122 forms a recessed space 1221 that is recessed toward the receiving cavity 123. The case cover 121 forms a bent portion 1211 that bends toward the receiving cavity 123. The portion of the case cover 121 covers the outer surface of the case body 122, and the bent portion 1211 extends into the recessed space 1221. A portion of the connector 13 passes through the bent portion 1211 and the wall forming the recessed space 1221 and connects the bent portion 1211 to the case body 122.

[0083] In some embodiments, such as Figures 2 to 4 As shown, the housing 122 and the cover 121 together form a receiving cavity 123, and the battery cell assembly 11 is disposed in the receiving cavity 123. The battery cell assembly 11 includes at least one or more battery cells 111.

[0084] In some embodiments, the battery cell 111 includes electrode terminals, a housing, and an electrode assembly located within the housing. The housing includes a plurality of housing walls, and the electrode terminals are disposed on the housing walls and electrically connected to the electrode assembly.

[0085] Optionally, a portion of the housing 122 may be thinned, forming a recessed space 1221 (not shown) that is recessed toward the receiving cavity 123; alternatively, a portion of the housing 122 may be bent to form the recessed space 1221 that is recessed toward the receiving cavity 123.

[0086] Optionally, a portion of the outer surface of the housing 122 forms a recessed space 1221, and the portion forming the recessed space 1221 may be located at the end of the housing 122 along the first direction X (e.g., Figures 3 to 8 and Figure 11 (as shown) or roughly in the middle near the end (e.g.) Figure 9 and Figure 10 (As shown).

[0087] Optionally, the outer surface portion of the box 122 forming the recessed space 1221 can be L-shaped (e.g., Figures 3 to 8 and Figure 11 (as shown) or "n" type (e.g.) Figure 9 and Figure 10 (As shown).

[0088] In some embodiments, a portion of the cover 121 is located in the recessed space 1221, and the connector 13 connects the portion of the cover 121 located in the recessed space 1221 and the housing 122. All or part of the first portion 131 of the connector 13 located outside the battery box 12 is located inside the recessed space 1221.

[0089] In some embodiments, the lid 121 has a bent portion 1211 that extends into a recessed space 1221, and the connector 13 passes through the bent portion 1211 and the body 122 and connects the bent portion 1211 and the body 122.

[0090] The bending portion 1211 extending into the recessed space 1221 means that part or all of the bending portion 1211 can extend into the recessed space 1221.

[0091] In some embodiments, such as Figure 3 and Figure 4 As shown, the lid 121 includes two first cover walls 1212 opposite each other along a second direction Y. At least one first cover wall 1212 includes a first cover portion M1 and a bent portion 1211 bent relative to the first cover portion M1, wherein the thickness of the first cover portion M1 and the thickness of the bent portion 1211 may be the same or different. In one specific embodiment, the thickness of the first cover portion M1 and the thickness of the bent portion 1211 are the same.

[0092] Optionally, the lid 121 can be formed by a one-piece stamping process, or the lid 121 can be formed by welding the bent portion 1211 to the other parts of the lid 121 excluding the bent portion 1211. In one specific embodiment, the lid 121 can be formed by a one-piece stamping process.

[0093] In some embodiments, the lid 121 is resilient.

[0094] The material of the cover 121 can be the same as that commonly used in battery boxes on the market, such as sheet metal.

[0095] In some embodiments, such as Figure 3 and Figure 4As shown, the box body 122 and the box cover 121 are closed along a first direction X. The box cover 121 includes two first cover walls 1212 facing each other along a second direction Y. At least one first cover wall 1212 has a bent portion 1211. The box body 122 includes two first box walls 1222 facing each other along the second direction Y. The outer surface of at least one first box wall 1222 forms a recessed space 1221 that is recessed toward the receiving cavity 123. The connector 13 passes through the first cover wall 1212 and the first box wall 1222 and connects the first cover wall 1212 and the first box wall 1222. The outer surface of the first box wall 1222 refers to the surface of the first box wall 1222 that faces away from the receiving cavity 123.

[0096] Optionally, the recessed space 1221 can be formed by integral stamping of the first box wall 1222, or the recessed space 1221 can be formed by welding or other connection methods of multiple parts of the first box wall 1222. In a specific embodiment, the recessed space 1221 is formed by integral stamping of the first box wall 1222.

[0097] Optionally, such as Figure 7 , Figure 8 , Figure 9 and Figure 11 As shown, the connector 13 can pass through the first cover wall 1212 and the first box wall 1222 along the first direction X and connect the first cover wall 1212 and the first box wall 1222; as Figure 5 , Figure 6 and Figure 10 As shown, the connector 13 can pass through the first cover wall 1212 and the first box wall 1222 along the second direction Y and connect the first cover wall 1212 and the first box wall 1222, etc.

[0098] Optionally, such as Figure 5 , Figure 6 , Figures 8 to 11 As shown, the shape of the bent portion 1211 can be similar to the shape of the outer surface of the recessed space 1221 of the first box wall 1222; as Figure 7 As shown, the shape of the bent portion 1211 can be similar to the shape of the portion of the outer surface of the first box wall 1222 that forms the recessed space 1221, etc.

[0099] Optionally, the outer surface of the recessed space 1221 formed by the bent portion 1211 and the housing 122 can be fully abutted, partially abutted, or spaced apart.

[0100] Optionally, the connector 13 may include bolts, screws, nuts, etc. For example, the bolt may be a standard hexagonal head flange bolt, with the bolt shank passing through the bend 1211 and the housing 122, and the bolt shank engaging and locking with the housing 122 through a threaded hole, and the bolt head may be completely located within the recessed space 1221.

[0101] In some embodiments, the connector 13 includes a bolt and a nut, the bolt passing through the bend 1211 and the housing 122, the head of the bolt abutting against the bend 1211, the nut being connected to the bolt, and the nut abutting against the housing 122.

[0102] In some embodiments, such as Figures 7 to 11 As shown, the connector 13 passes through the bend 1211 and the housing 122. Along the direction in which the connector 13 passes through the bend 1211 and the housing 122, one end of the connector 13 near the bend 1211 is located outside the receiving cavity and abuts against the bend 1211, while the other end of the connector 13 away from the bend 1211 can be located inside the housing wall of the housing 122. For example, the connector 13 can be threaded to both the bend 1211 and the housing 122, or the connector 13 can be threaded to the housing 122.

[0103] Alternatively, the connector 13 can be a bolt or screw, etc.

[0104] Because the outer surface of the housing 122 forms a recessed space 1221 that is recessed toward the receiving cavity 123, and the bent portion 1211 of the cover 121 extends into the recessed space 1221, and the connector 13 connects the bent portion 1211 and the housing 122, the portion of the connector 13 located outside the cover 121 can be located inside the recessed space 1221. When the battery device 1 is placed in the receiving space that receives the battery device 1, the size of the gap between the battery device 1 and the boundary of the receiving space can be smaller, the overall size of the battery box 12 can be larger, and the receiving cavity 123 in the battery box 12 for receiving the battery cell assembly 11 can be larger. As a result, a higher energy battery cell assembly 11 can be installed in the battery box 12, thereby increasing the energy of the battery device 1 in the power consumption device or energy storage device. Moreover, connecting the housing 122 and the cover 121 with the connector 13 facilitates the assembly and disassembly of the housing 122 and the cover 121.

[0105] In some embodiments, such as Figures 5 to 11 As shown, the box body 122 and the box cover 121 are closed along the first direction X. The box cover 121 includes two first cover walls 1212 that are opposite each other along the second direction Y. At least one first cover wall 1212 is formed with a bend 1211. The first direction X intersects the second direction Y. The part of the connector 13 located on the side of the bend 1211 facing away from the box body 122 is the first part 131. In the same projection plane projected along the first direction X, the projection of the first part 131 and the projection of the first cover wall 1212 have an overlapping part.

[0106] Optionally, one first cover wall 1212 may have a bent portion 1211, and the outer surface of one first box wall 1222 may have a recessed space 1221 that is recessed toward the receiving cavity 123, with the bent portion 1211 extending into the recessed space 1221; alternatively, two first cover walls 1212 may each have a bent portion 1211, and the outer surfaces of the two first box walls 1222 may each have a recessed space 1221 that is recessed toward the receiving cavity 123, with one bent portion 1211 extending into one of the recessed spaces 1221 and the other bent portion 1211 extending into the other recessed space 1221.

[0107] In some embodiments, the first portion 131 is located outside the cover 121.

[0108] Optionally, within the same projection plane along the first direction X, all or part of the projection of the first portion 131 overlaps with the projection of the first cover wall 1212.

[0109] Optionally, all or part of the first portion 131 may be located within the recessed space 1221.

[0110] Since the projection of the first part 131 and the projection of the first cover wall 1212 overlap in the same projection plane along the first direction X, the first part 131 can share the space perpendicular to the first direction X with the first cover wall 1212. Therefore, with the limited space capacity, the size of the battery box 12 can be set to be larger, thereby increasing the energy of the battery device 1.

[0111] In some embodiments, within the same projection plane projected along the first direction X, the projection of the first portion 131 lies within the range of the projections of the housing 122 and the cover 121.

[0112] Projecting along the first direction X, the projection of the box body 122 and the box cover 121 refers to the projection formed by the projection of the box body and the projection of the box cover 121 together.

[0113] In some embodiments, within the same projection plane projected along the first direction X, the entire projection of the first portion 131 lies within the range of the projections of the housing 122 and the lid 121. Optionally, within the same projection plane projected along the first direction X, the entire outer contour of the projection of the first portion 131 may lie within the range of the outer contours of the projections of the housing 122 and the lid 121; alternatively, within the same projection plane projected along the first direction X, a portion of the outer contour of the projection of the first portion 131 may overlap with a portion of the outer contours of the projections of the housing 122 and the lid 121.

[0114] In some embodiments, the entire first portion 131 may be located within the recessed space 1221.

[0115] Since the projection of the first part 131 is within the projection range of the battery box 12 on the same projection plane along the first direction X, the entire first part 131 can share the space perpendicular to the first direction X with the battery box 12. Therefore, with the limited space capacity, the size of the battery box 12 can be further set to be larger, thereby further improving the energy of the battery device 1.

[0116] In some embodiments, such as Figures 5 to 11 As shown, within the same projection plane along the second direction Y, the projection of the first part 131 lies within the projection range of the box body 122 and the box cover 121.

[0117] In some embodiments, within the same projection plane projected along the second direction Y, the entire projection of the first portion 131 lies within the range of the projections of the housing 122 and the lid 121. Optionally, within the same projection plane projected along the second direction Y, the entire outer contour of the projection of the first portion 131 may lie within the range of the outer contours of the projections of the housing 122 and the lid 121; alternatively, within the same projection plane projected along the second direction Y, a portion of the outer contour of the projection of the first portion 131 may overlap with a portion of the outer contours of the projections of the housing 122 and the lid 121.

[0118] Since the projection of the first part 131 is within the projection range of the housing 122 and the cover 121 on the same projection plane along the second direction Y, the entire first part 131 can share the space perpendicular to the second direction Y with the housing 122 and the cover 121. Therefore, with the limited space capacity, the size of the battery box 12 can be set to be larger, thereby further improving the energy of the battery device 1.

[0119] It is understandable that, within the same projection plane along the second direction Y, the projection of the first part 131 may overlap with the projections of the box body 122 and the box cover 121.

[0120] In some embodiments, such as Figures 7 to 9 and Figure 11 As shown, at least one first cover wall 1212 includes a first cover portion M1 and a second cover portion M2 connected together. At least a portion of the first cover portion M1 covers the outer surface of the housing. The second cover portion M2 is bent relative to the first cover portion M1 toward the receiving cavity 123. The bent portion 1211 includes the second cover portion M2. At least a portion of the second cover portion M2 is located in the recessed space 1221. Along the first direction X, a portion of the connector 13 passes through the second cover portion M2 and the housing 122 and connects the second cover portion M2 and the housing 122.

[0121] Optionally, the first cover M1 may partially or completely cover the outer surface of the box.

[0122] In some embodiments, such as Figures 7 to 9 and Figure 11 As shown, the first cover wall 1212 includes a first cover portion M1 and a second cover portion M2 connected to the first cover portion M1. Projected along a third direction Z, the projection of the first cover portion M1 extends along a first direction X, and the projection of the second cover portion M2 extends along a second direction Y. At least a portion of the second cover portion M2 is located in a recessed space 1221. Along the first direction X, a connector 13 connects the second cover portion M2 and the housing 122. Wherein, as... Figure 7 As shown, the end of the second cover M2 away from the first cover M1 along the second direction Y can be the end of the box cover 121, where the end of the box cover 121 refers to the edge of the box cover 121. There are no other structures connecting the box cover 121 at this point; that is, the end of the second cover M2 away from the first cover M1 along the second direction Y is not connected to any other structure of the box cover 121, or as... Figure 8 , Figure 9 and Figure 11 As shown, the end of the second cover M2 that is away from the first cover M1 along the second direction Y can also be connected to the third cover M3.

[0123] Since the portion of the connector 13 passes through the second cover M2 and the housing 122 along the first direction X and connects the second cover M2 and the housing 122, the structure of the bending portion 1211 is simple and easy to manufacture, and the connector 13 can easily connect the second cover M2 and the housing 122.

[0124] In some embodiments, such as Figure 5 , Figure 6 , Figure 10 As shown, at least one first cover wall 1212 includes a first cover portion M1, a second cover portion M2, and a third cover portion M3. The outer surface of the third cover portion M3 is recessed relative to the outer surface of the first cover portion M1 toward the recessed space 1221. The second cover portion M2 connects the first cover portion M1 and the third cover portion M3. The bending portion 1211 includes the second cover portion M2 and the third cover portion M3. Along the second direction Y, a portion of the connector 13 passes through the third cover portion M3 and the housing 122 and connects the third cover portion M3 and the housing 122.

[0125] In some embodiments, such as Figure 5 , Figure 6 , Figure 10As shown, the first cover wall 1212 includes a first cover portion M1, a second cover portion M2, and a third cover portion M3. The second cover portion M2 connects the first cover portion M1 and the third cover portion M3, projecting along a third direction Z. The projection of the first cover portion M1 extends along a first direction X, the projection of the second cover portion M2 extends along a second direction Y, and the projection of the third cover portion M3 extends along the first direction X. The projections of the first cover portion M1 and the third cover portion M3 are located on opposite sides of the projection of the second cover portion M2 along the first direction X. At least a portion of the second cover portion M2 and at least a portion of the third cover portion M3 are located in a recessed space 1221 along the second direction Y. A connector 13 connects the second cover portion M2 and the housing 122. Wherein, as... Figure 5 , Figure 6 As shown, the end of the third cover M3 away from the second cover M2 along the first direction X can be the end of the box cover 121, where the end of the box cover 121 refers to the edge of the box cover 121. There are no other structures connecting the box cover 121 at this point; that is, the end of the third cover M3 away from the second cover M2 along the first direction X is not connected to any other structure of the box cover 121, or as... Figure 10 As shown, a fourth cover M4 can also be connected to the end of the third cover M3 along the first direction X away from the second cover M2, wherein the second cover M2 and the fourth cover M4 can be connected to one side of the third cover M3 along the second direction Y (e.g. Figure 10 (Left side shown) or both sides (not shown).

[0126] Since the portion of the connector 13 passes through the third cover M3 and the housing 122 along the second direction Y and connects the third cover M3 and the housing 122, the structure of the bending portion 1211 is simple and easy to manufacture, and the connector 13 can easily connect the third cover M3 and the housing 122.

[0127] Since the connector 13 can connect the housing 122 and the cover along the first direction X or along the second direction Y, the degree of freedom in setting the connector 13 is increased.

[0128] In some embodiments, such as Figure 6 As shown, along the second direction Y, the maximum dimension H1 of the outer surface of the second cover M2 is in the range of 3mm to 18mm.

[0129] The outer surface of the second cover M2 refers to the surface of the second cover M2 that faces away from the receiving cavity 123.

[0130] Along the second direction Y, the maximum dimension H1 of the outer surface of the second cover M2 refers to the distance between the two opposite ends of the outer surface of the second cover M2 along the second direction Y. Optionally, the maximum dimension H1 of the outer surface of the second cover M2 along the second direction Y can be 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, etc. Of course, the maximum dimension H1 of the outer surface of the second cover M2 along the second direction Y can be other values ​​within the above range.

[0131] Therefore, along the second direction Y, the recessed space 1221 can almost accommodate the entire first part 131, so the size of the gap between the battery device 1 and the boundary of the accommodating space can be further reduced, and the energy of the battery device 1 can be further improved.

[0132] It is understandable that, along the second direction Y, the maximum dimension H1 of the outer surface of the second cover M2 can be greater than 18 mm or less than 3 mm.

[0133] In some embodiments, such as Figure 6 As shown, along the first direction X, the maximum dimension H2 of the outer surface of the third cover M3 is greater than 8mm.

[0134] The outer surface of the third cover M3 refers to the surface of the third cover M3 facing away from the receiving cavity 123.

[0135] Along the first direction X, the maximum dimension H2 of the outer surface of the third cover portion M3 refers to the distance between the two opposite ends of the outer surface of the third cover portion M3 along the first direction X. Optionally, the maximum dimension H2 of the outer surface of the third cover portion M3 along the first direction X can be 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 20mm, etc. Of course, the maximum dimension H2 of the outer surface of the third cover portion M3 along the first direction X can be other values ​​within the above range.

[0136] Thus, along the first direction X, the recessed space 1221 can almost accommodate the entire first part 131, so the size of the gap between the battery device 1 and the boundary of the accommodating space can be further reduced, and the energy of the battery device 1 can be further improved.

[0137] It is understandable that, along the first direction X, the maximum dimension H2 of the outer surface of the third cover M3 can be less than 8mm.

[0138] In some embodiments, such as Figures 5 to 11As shown, the first box wall 1222 includes a first box section N1, a second box section N2, and a third box section N3. The second box section N2 connects the first box section N1 and the third box section N3 and projects along the third direction Z. The projection of the first box section N1 extends along the first direction X, the projection of the second box section N2 extends along the second direction Y, and the projection of the third box section N3 extends along the first direction X. The projections of the first box section N1 and the third box section N3 are located on opposite sides of the projection of the second box section N2 along the first direction X. A recessed space 1221 is formed between the outer surface of the second box section N2 and the outer surface of the third box section N3.

[0139] Optionally, the included angle formed between the first box section N1 and the second box section N2 can be a right angle or a non-right angle. For example, the included angle formed between the inner surface of the first box section N1 and the inner surface of the second box section N2 can be a right angle, an obtuse angle, or an acute angle.

[0140] Optionally, the included angle formed between the second box section N2 and the third box section N3 can be a right angle or a non-right angle. For example, the included angle formed between the outer surface of the second box section N2 and the outer surface of the third box section N3 can be a right angle, an obtuse angle, or an acute angle.

[0141] In some embodiments, such as Figures 2 to 4 As shown, the box body 122 includes a second box wall 1223, which is connected to the first box wall 1222 opposite to it along the second direction Y.

[0142] In some embodiments, both ends of the second box wall 1223 along the second direction Y are respectively connected to the third box portion N3 of the first box wall 1222 opposite to it along the second direction Y. Optionally, one end of the second box wall 1223 along the second direction Y (e.g.) Figure 4 The left end shown can be connected to the end of the third box section N3 along the first direction X near the second box section N2 (e.g. Figure 4 It can also be connected to the end of the third housing N3 that is away from the second housing N2 along the first direction X (e.g., the upper end shown), or it can be connected to the end of the third housing N3 that is away from the second housing N2 along the first direction X (e.g., the upper end shown). Figure 4 (As shown in the lower part) connection, etc.

[0143] In a specific embodiment, such as Figure 4 As shown, one end of the second box wall 1223 along the second direction Y (e.g.) Figure 4 The left end shown can be connected to the end of the third box section N3 along the first direction X near the second box section N2 (e.g. Figure 4 The upper end of the connector is connected to the third cover M3 and the third box N3 along the second direction Y. The two ends of the connector 13 along the second direction Y are located outside the battery box 12.

[0144] In some embodiments, such as Figure 13As shown, the battery device 1 also includes a support beam 14, which connects to the opposite third box section N3 along the second direction Y. Along the first direction X, the side of the support beam 14 facing the receiving cavity 123 abuts against the side of the second box wall 1223 facing away from the receiving cavity 123.

[0145] In some embodiments, the second box wall 1223 may be a liquid cooling plate.

[0146] In some embodiments, such as Figure 7 As shown, the box body 122 includes two first box walls 1222 opposite each other along the second direction Y. At least one first box wall 1222 includes a first box part N1, a second box part N2 and a third box part N3. The first box part N1 and the third box part N3 are respectively connected to the two sides of the second box part N2 along the first direction X. A recessed space 1221 is formed between the outer surface of the second box part N2 and the outer surface of the third box part N3. At least a portion of the first cover part M1 covers the outer surface of the first box part N1, and at least a portion of the second cover part M2 covers the outer surface of the second box part N2. Along the second direction Y, the end of the second cover part M2 away from the first cover part M1 is the end of the box cover 121.

[0147] Optionally, the first cover M1 may cover all or part of the outer surface of the first box N1; alternatively, the second cover M2 may cover all or part of the outer surface of the second box N2.

[0148] In some embodiments, such as Figure 7 As shown, the inner surface of the first cover M1 abuts against the outer surface of the first box N1, and the inner surface of the second cover M2 abuts against the outer surface of the second box N2. Along the first direction X, the connector 13 connects the second cover M2 and the second box N2.

[0149] Therefore, the bending portion 1211 has a simple structure and is easy to manufacture. Moreover, at least a portion of the first cover portion M1 covers the outer surface of the first box portion N1, and at least a portion of the second cover portion M2 covers the outer surface of the second box portion N2. Thus, the connection between the box body 122 and the cover 121 can form a labyrinth-like sealing structure, which can improve the sealing performance of the connection between the box body 122 and the cover 121, thereby improving the sealing performance of the battery device 1 and its waterproof and dustproof performance.

[0150] In other embodiments, such as Figure 5 , Figure 6 , Figure 8 and Figure 11As shown, at least one first cover wall 1212 further includes a third cover portion M3, the outer surface of the third cover portion M3 being recessed relative to the outer surface of the first cover portion M1 toward the recessed space 1221, a second cover portion M2 connecting the first cover portion M1 and the third cover portion M3, a bending portion 1211 including the second cover portion M2 and the third cover portion M3, the box cover 121 including two first box walls 1222 opposite each other along the second direction Y, at least one first box wall 1222 including a first box portion N1, a second box portion N2 and a third box portion N3, the first box... Part N1 and third box part N3 are respectively connected to the two sides of the second box part N2 along the first direction X. A recessed space 1221 is formed between the outer surface of the second box part N2 and the outer surface of the third box part N3. At least part of the first cover part M1 covers the outer surface of the first box part N1, at least part of the second cover part M2 covers the outer surface of the second box part N2, and at least part of the third cover part M3 covers the outer surface of the third box part N3. Along the first direction X, the end of the third cover part M3 away from the second cover part M2 is the end of the box cover 121.

[0151] The end of the lid 121 refers to the edge of the lid 121. There are no other structures connecting the lid 121 at this point. That is, the end of the third cover part M3 away from the second cover part M2 along the first direction X is not connected to any other structure of the lid 121.

[0152] Optionally, the first cover M1 may cover all or part of the outer surface of the first box N1; alternatively, the second cover M2 may cover all or part of the outer surface of the second box N2; alternatively, the third cover M3 may cover all or part of the outer surface of the third box N3.

[0153] In some embodiments, the projection of the third cover portion M3 extends along the first direction X, and the projections of the first cover portion M1 and the third cover portion M3 are respectively located on opposite sides of the projection of the second cover portion M2 along the first direction X; the inner surface of the first cover portion M1 abuts against the outer surface of the first box portion N1, the inner surface of the second cover portion M2 abuts against the outer surface of the second box portion N2, and the inner surface of the third cover portion M3 abuts against the outer surface of the third box portion N3, as shown. Figure 8 and Figure 11 As shown, along the first direction X, connector 13 connects the second cover portion M2 and the second box portion N2, or as... Figure 5 and Figure 6 As shown, along the second direction Y, connector 13 connects the third cover part M3 and the third box part N3.

[0154] Since at least a portion of the first cover M1 covers the outer surface of the first housing N1, at least a portion of the second cover M2 covers the outer surface of the second housing N2, and at least a portion of the third cover M3 covers the outer surface of the third housing N3, a labyrinth-like sealing structure can be formed at the connection between the housing 122 and the cover 121. This improves the sealing performance at the connection between the housing 122 and the cover 121, thereby improving the sealing performance of the battery device 1 and its waterproof and dustproof performance. Furthermore, since the end of the third cover M3 away from the second cover M2 along the first direction X is the end of the cover 121, the bent portion 1211 can be formed at the end of the first cover wall 1212 along the first direction X, resulting in a simple structure that is easy to manufacture.

[0155] In some other embodiments, such as Figure 9 and Figure 10 As shown, at least one first cover wall 1212 further includes a third cover portion M3 and a fourth cover portion M4. The third cover portion M3 connects the second cover portion M2 and the fourth cover portion M4. The outer surfaces of the second cover portion M2, the third cover portion M3, and the fourth cover portion M4 form a groove recessed toward the receiving cavity 123. The bent portion 1211 includes the second cover portion M2, the third cover portion M3, and the fourth cover portion M4. The housing 122 includes two first housing walls 1222 opposite each other along the second direction Y. At least one first housing wall 1222 includes a first housing portion N1, a second housing portion N2, a third housing portion N3, and... The fourth box section N4, the second box section N2 connects the first box section N1 and the third box section N3, the third box section N3 connects the second box section N2 and the fourth box section N4, the outer surfaces of the second box section N2, the third box section N3 and the fourth box section N4 form a groove-shaped recessed space 1221, at least a portion of the first cover section M1 covers the outer surface of the first box section N1, at least a portion of the second cover section M2 covers the outer surface of the second box section N2, at least a portion of the third cover section M3 covers the outer surface of the third box section N3, and at least a portion of the fourth cover section M4 covers the outer surface of the fourth box section N4.

[0156] Optionally, the first cover M1 may cover all or part of the outer surface of the first box N1; alternatively, the second cover M2 may cover all or part of the outer surface of the second box N2; alternatively, the third cover M3 may cover all or part of the outer surface of the third box N3; alternatively, the fourth cover M4 may cover all or part of the outer surface of the fourth box N4.

[0157] In some embodiments, when projected along a third direction Z, the projection of the third cover portion M3 extends along a first direction X, and the projections of the first cover portion M1 and the third cover portion M3 are located on opposite sides of the projection of the second cover portion M2 along the first direction X; when projected along a third direction Z, the projection of the fourth cover portion M4 extends along a second direction Y, and the projections of the second cover portion M2 and the fourth cover portion M4 are located on the same side of the projection of the third cover portion M3 along the second direction Y (e.g.) Figure 9 (As shown on the left). The first box wall 1222 also includes a fourth box section N4, projected along the third direction Z. The projection of the fourth box section N4 extends along the second direction Y, and the projections of the second box section N2 and the fourth box section N4 are located on the same side of the projection of the third box section N3 along the second direction Y (e.g., Figure 9 As shown on the left), the inner surface of the first cover M1 abuts against the outer surface of the first box N1, the inner surface of the second cover M2 abuts against the outer surface of the second box N2, the inner surface of the third cover M3 abuts against the outer surface of the third box N3, and the inner surface of the fourth cover M4 abuts against the outer surface of the fourth box N4, as shown. Figure 9 As shown, along the first direction X, connector 13 connects the second cover portion M2 and the second box portion N2, or as... Figure 10 As shown, along the second direction Y, connector 13 connects the third cover portion M3 and the third box portion N3. The end of the fourth box portion N4 along the second direction Y away from the third box portion N3 can be the end of the box cover 121, or the end of the fourth box portion N4 along the second direction Y away from the third box portion N3 can be connected to a fifth box portion; the end of the fourth cover portion M4 along the second direction Y away from the third cover portion M3 can be the end of the box cover 121, or the end of the fourth cover portion M4 along the second direction Y away from the third cover portion M3 can be connected to a fifth cover portion.

[0158] Since at least a portion of the first cover M1 covers the outer surface of the first box N1, at least a portion of the second cover M2 covers the outer surface of the second box N2, at least a portion of the third cover M3 covers the outer surface of the third box N3, and at least a portion of the fourth cover M4 covers the outer surface of the fourth box N4, a labyrinth-like sealing structure can be formed at the connection between the box body 122 and the cover 121. This improves the sealing performance at the connection between the box body 122 and the cover 121, thereby improving the sealing performance of the battery device 1 and enhancing its waterproof and dustproof performance.

[0159] Therefore, the bending portion 1211 can be configured in various ways, which can increase the design freedom of the bending portion 1211 and thus increase the design freedom of the battery device 1.

[0160] The above description of the shapes of the first box wall 1222 and the first cover wall 1212 is merely an illustrative example. Of course, the shapes of the first box wall 1222 and the first cover wall 1212 can also be other shapes.

[0161] In some embodiments, such as Figure 11 and Figure 12 As shown, the box body 122 includes two first box walls 1222 opposite to each other along the second direction Y. At least one first box wall 1222 includes a first box portion N1, a second box portion N2, and a third box portion N3. The first box portion N1 and the third box portion N3 are respectively connected to the two sides of the second box portion N2 along the first direction X. A recessed space 1221 is formed between the outer surface of the second box portion N2 and the outer surface of the third box portion N3. The box body 122 also includes a second box wall 1223. The two ends of the second box wall 1223 opposite to each other along the second direction Y are respectively connected to the third box portion N3 of the two first box walls 1222. The thickness direction of the second box wall 1223 is the same as that of the first direction X.

[0162] In some embodiments, the first direction X is the same as the direction of gravity, and the second box wall 1223 supports the battery cell assembly 11.

[0163] In some embodiments, the two ends of the second box wall 1223 along the second direction Y can be connected to the third box portion N3 of the two first box walls 1222 respectively.

[0164] Optionally, the second box wall 1223 and the third box section N3 can be directly connected or indirectly connected. For example, the second box wall 1223 and the third box section N3 are welded together. Even more exemplaryly, the second box wall 1223 and the third box section N3 are integrally formed.

[0165] Since the two ends of the second box wall 1223 are respectively connected to the third box part N3 of the two first box walls 1222 along the second direction Y, the box body 122 can be formed with a simple structure.

[0166] In some embodiments, such as Figure 11 As shown, at least one first box wall 1222 also includes a fourth box section N4. The second box section N2 and the fourth box section N4 are respectively connected to the two sides of the third box section N3 along the second direction Y. Along the first direction X, a portion of the outer surface of the second box wall 1223 abuts against the inner surface of the fourth box section N4.

[0167] In some embodiments, the first box wall 1222 further includes a fourth box portion N4 projected along a third direction Z. The projection of the fourth box portion N4 extends along a second direction Y, and the projections of the second box portion N2 and the fourth box portion N4 are located on opposite sides of the projection of the third box portion N3 along the second direction Y. The inner surface of the first cover portion M1 abuts against the outer surface of the first box portion N1, the inner surface of the second cover portion M2 abuts against the outer surface of the second box portion N2, the inner surface of the third cover portion M3 abuts against the outer surface of the third box portion N3, and along the first direction X, the outer surface of the second box wall 1223 abuts against the inner surface of the fourth box portion N4.

[0168] Since part of the outer surface of the second box wall 1223 abuts against the inner surface of the fourth box part N4 along the first direction X, the fourth box part N4 can support the second box wall 1223, improve the connection strength between the first box wall 1222 and the second box wall 1223, and reduce the probability of the connection between the first box wall 1222 and the second box wall 1223 breaking.

[0169] It is understood that the first box wall 1222 may not have a fourth box section N4, and the second box wall 1223 is connected to the third box section N3. In some embodiments, such as Figure 12 As shown, the end of the third box section N3 that is away from the second box section N2 is the end of the first box wall 1222.

[0170] For example, the second box wall 1223 is welded to the third box section N3. For yet another example, the second box wall 1223 and the third box section N3 are integrally formed.

[0171] It has a simple structure and is easy to manufacture and assemble.

[0172] In some embodiments, such as Figures 5 to 11 As shown, the housing 122 includes two first housing walls 1222 opposite each other along the second direction Y. At least one first housing wall 1222 includes a first housing portion N1, a second housing portion N2, and a third housing portion N3. The second housing portion N2 connects the first housing portion N1 and the third housing portion N3. A recessed space 1221 is formed between the outer surfaces of the second housing portion N2 and the outer surfaces of the third housing portion N3. At least a portion of the first cover portion M1 covers the outer surface of the first housing portion N1, and at least a portion of the second cover portion M2 covers the outer surface of the second housing portion N2. Along the second direction Y, the end of the second housing portion N2 facing the first cover portion M1 (e.g., ...) Figure 5 The left end shown abuts against the inner surface of the first cover M1; along the second direction Y, the end of the second cover M2 facing the third box N3 (e.g. Figure 5 The right end shown abuts against the outer surface of the third box section N3.

[0173] Since the end of the second box part N2 facing the first cover part M1 abuts against the inner surface of the first cover part M1 along the second direction Y, and the end of the second cover part M2 facing the third box part N3 abuts against the outer surface of the third box part N3 along the second direction Y, the positioning of the box body 122 and the box cover 121 along the second direction Y can be realized, which facilitates the connection of the connector 13 to the box body 122 and the box cover 121.

[0174] It is understandable that, along the second direction Y, the end of the second box portion N2 facing the first cover portion M1 (e.g.) Figure 5 The left end shown may not abut against the inner surface of the first cover M1; and / or along the second direction Y, the end of the second cover M2 facing the third box N3 (e.g. Figure 5The right end shown may not be in contact with the outer surface of the third box section N3.

[0175] In some embodiments, such as Figure 5 , Figures 7 to 11 As shown, the box cover 121 includes a second cover wall 1213, which connects two first cover walls 1212 that are opposite each other along the second direction Y. The wall thickness direction of the second cover wall 1213 is the same as that of the first direction X. Along the first direction X, the two ends of the first box part N1 abut against the inner surface of the second cover wall 1213 and the inner surface of the second cover part M2, respectively.

[0176] Since the two ends of the first box part N1 abut against the inner surface of the second cover wall 1213 and the inner surface of the second cover part M2 respectively along the first direction X, the positioning of the box body 122 and the box cover 121 along the first direction X can be realized, which facilitates the connection of the connector 13 to the box body 122 and the box cover 121.

[0177] It is understandable that, such as Figure 6 As shown, along the first direction X, one end of the first box part N1 facing the inner surface of the second cover wall 1213 may not abut against the inner surface of the second cover wall 1213; or along the first direction X, one end of the first box part N1 facing the inner surface of the second cover part M2 may not abut against the inner surface of the second cover part M2.

[0178] In some embodiments, along the first direction X, the inner surface of the second cover portion M2 abuts against the outer surface of the second box portion N2.

[0179] In some embodiments, the first direction X is the same as the direction of gravity, and the second cover M2 supports the second box N2. Furthermore, the second cover M2 extends horizontally, and the second box N2 extends horizontally, thereby further improving the stability of the second cover M2 supporting the second box N2.

[0180] In some embodiments, the inner surface of the second housing N2 abuts against the battery cell assembly 11.

[0181] In some embodiments, such as Figure 6 As shown, one of the sides of the first box wall 1222 facing the first cover wall 1212 and the side of the first cover wall 1212 facing the first box wall 1222 has a protrusion Q, and the other has a groove, with the protrusion Q located in the groove.

[0182] Optionally, the first box wall 1222 may have a groove on the side facing the first cover wall 1212, and the first cover wall 1212 may have a protrusion Q on the side facing the first box wall 1222, with the corresponding protrusion Q located in the corresponding groove; and / or the first box wall 1222 may have a protrusion Q on the side facing the first cover wall 1212, and the first cover wall 1212 may have a groove on the side facing the first box wall 1222, with the corresponding protrusion Q located in the corresponding groove.

[0183] Optionally, the protrusion Q or the groove may be located in the first box section N1, the second box section N2 and / or the third box section N3 of the first box wall 1222.

[0184] Optionally, the protrusion Q or the groove may be located in the first cover portion M1, the second cover portion M2 and / or the third cover portion M3 of the first cover wall 1212.

[0185] Since the protrusion Q is located in the groove, when the box body 122 and the box cover 121 are connected, the protrusion Q and the groove can position the relative positions of the box body 122 and the box cover 121, which facilitates the assembly of the box body 122 and the box cover 121 and facilitates the connection of the connector 13 to the box body 122 and the box cover 121.

[0186] It is understandable that the side of the first box wall 1222 facing the first cover wall 1212 may not have a protrusion Q and a groove, and the side of the first cover wall 1212 facing the first box wall 1222 may not have a protrusion Q and a groove.

[0187] In some embodiments, such as Figure 2 As shown, the battery box 12 also includes two end plates 124 facing each other along a third direction Z; the box cover includes a second cover wall 1213, which is disposed opposite to the second box wall 1223 along a first direction X, and the second cover wall 1213 connects two first cover walls 1212 facing each other along a second direction Y; the box body 122 includes two first box walls 1222 facing each other along a second direction Y and a second box wall 1223 connecting the two first box walls 1222, at least a portion of the first cover wall 1212 covers the outer surface of the first box wall 1222, the two ends of the end plate 124 along the first direction X are respectively connected to the second cover wall 1213 and the second box wall 1223, and the two ends of the end plate 124 along the second direction Y are respectively connected to the first cover wall 1212 facing each other along the second direction Y, and the first direction X, the second direction Y and the third direction Z intersect each other and are not coplanar.

[0188] In some embodiments, the lid is U-shaped.

[0189] In some embodiments, during the assembly of the battery device 1, the cover 121 is transported to a position approximately directly above the body 122 using a hoisting device, so that the cover 121 and the body 122 are initially aligned. The first cover wall 1212 is pried open along the second direction Y towards the side opposite to the receiving cavity 123 by machine or manually, and the second cover wall 1213 is pressed so that the bent part 1211 extends into the recessed space 1221, thereby achieving the pre-positioning of the body 122 and the cover 121. The connector 13 can pass through the body 122 and the cover 121 in sequence, and the connector 13 is tightened with a torque wrench at a preset torque value. The cover 121 has a hole that allows the connector 13 to pass through, and the connector 13 and the body 122 can be threaded together.

[0190] Therefore, the end plate 124 can cover the two end faces of the battery cell module 11 along the third direction Z, which can reduce the probability of the battery cell module 11 being affected by external factors.

[0191] In some embodiments, the lid 121 is a one-piece molded structure.

[0192] This reduces the number of parts and improves the assembly efficiency of battery device 1.

[0193] Secondly, embodiments of this application also provide an electrical device, which includes a battery device 1 provided in the first aspect of embodiments of this application. The battery device 1 is used to store electrical energy and supply power to the electrical device.

[0194] This can increase the energy of the battery device 1 in the electrical device, thereby improving the battery life of the electrical device.

[0195] Thirdly, embodiments of this application also provide an energy storage device, which includes a battery device 1 provided in the first aspect of embodiments of this application. The battery device 1 is used to store electrical energy and provide electrical energy.

[0196] This can increase the energy of the battery device 1 in the energy storage device, thereby increasing the energy storage capacity of the energy storage device.

[0197] The following is an example illustrating a specific embodiment.

[0198] In one specific embodiment, during the assembly of the battery device 1, a hoisting device is used to transport the "U"-shaped cover 121 to a position approximately directly above the housing 122, so that the cover 121 and the housing 122 are initially aligned. Using the elasticity of the cover 121, either mechanically or manually, the first cover wall 1212 is pried open along the second direction Y towards the side opposite to the receiving cavity 123. The second cover wall 1213 is then pressed, causing the bent portion 1211 to extend into the recessed space 1221, thereby achieving the pre-positioning of the housing 122 and the cover 121 along the second direction Y. The end of the second box part N2 facing the first cover part M1 abuts against the inner surface of the first cover part M1. Along the second direction Y, the end of the second cover part M2 facing the third box part N3 abuts against the outer surface of the third box part N3, thereby achieving the positioning of the box body 122 and the box cover 121 along the second direction Y. The connecting piece 13 passes through the through hole of the bent part 1211 in sequence and is connected to the box body 122 by threads. The connecting piece 13 is tightened with a torque wrench according to the preset torque value. The side wall of the concave structure can provide operating space for the connecting piece 13 (bolt) to be locked. The inner surface of the second cover M2 is attached to the outer surface of the second box N2, and the inner surface of the third cover M3 is attached to the outer surface of the third box N3, thereby forming a labyrinth-type sealing structure. This improves the waterproof and dustproof performance of the battery box 12. Furthermore, the attachment of the inner surface of the second cover M2 to the outer surface of the second box N2 restricts the movement of the cover 121 along the first direction X, thereby enabling the cover 121 to be positioned along the first direction X and along the second direction Y.

[0199] The above embodiments are merely illustrative of the technical solutions of this application and are not intended to limit it. Although this application 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. These 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 application, and all should be covered within the scope of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way.

Claims

1. A battery device, characterized in that, Including individual battery cells and battery boxes, The battery box includes: The enclosure comprises a housing and a lid, which together form a receiving cavity. The battery cell assembly is housed within this cavity. The outer surface of the housing forms a recessed space facing the receiving cavity. The lid has a bent portion that bends towards the receiving cavity. The lid partially covers the outer surface of the housing, and the bent portion extends into the recessed space. A connector, a portion of which passes through the bend and the wall forming the recessed space and connects the bend to the housing.

2. The battery device according to claim 1, characterized in that, The box body and the box lid are closed together along a first direction. The box lid includes two first cover walls opposite each other along a second direction, and at least one of the first cover walls forms the bent portion. The first direction intersects the second direction. The portion of the connector located on the side of the bent part facing away from the housing is the first part. Within the same projection plane along the first direction, the projection of the first portion overlaps with the projection of the first cover wall.

3. The battery device according to claim 2, characterized in that, Within the same projection plane along the first direction, the projection of the first portion lies within the range of the projections of the box body and the box cover.

4. The battery device according to claim 2, characterized in that, Within the same projection plane along the second direction, the projection of the first portion lies within the range of the projections of the box body and the box cover.

5. The battery device according to claim 2, characterized in that, At least one of the first cover walls includes a first cover portion and a second cover portion connected together, at least a portion of the first cover portion covering the outer surface of the housing, the second cover portion being bent relative to the first cover portion toward the receiving cavity, the bent portion including the second cover portion, at least a portion of the second cover portion being located in the recessed space, and along the first direction, a portion of the connector passing through the second cover portion and the housing and connecting the second cover portion and the housing.

6. The battery device according to claim 2, characterized in that, At least one of the first cover walls includes a first cover portion, a second cover portion, and a third cover portion, the outer surface of the third cover portion being recessed relative to the outer surface of the first cover portion toward the recessed space, the second cover portion connecting the first cover portion and the third cover portion, and the bent portion including the second cover portion and the third cover portion. Along the second direction, a portion of the connector passes through the third cover and the housing and connects the third cover and the housing.

7. The battery device according to claim 5 or 6, characterized in that, Along the second direction, the maximum dimension of the outer surface of the second cover is in the range of 3 mm to 18 mm.

8. The battery device according to claim 6, characterized in that, Along the first direction, the maximum dimension of the outer surface of the third cover is greater than 8 mm.

9. The battery device according to claim 5, characterized in that, The box body includes two first box walls opposite each other along the second direction. At least one of the first box walls includes a first box section, a second box section, and a third box section. The first box section and the third box section are respectively connected to the two sides of the second box section along the first direction. The recessed space is formed between the outer surface of the second box section and the outer surface of the third box section. At least a portion of the first cover section covers the outer surface of the first box section, and at least a portion of the second cover section covers the outer surface of the second box section. Along the second direction, the end of the second cover section away from the first cover section is the end of the box cover.

10. The battery device according to claim 5, characterized in that, At least one of the first cover walls further includes a third cover portion, the outer surface of which is recessed relative to the outer surface of the first cover portion toward the recessed space; a second cover portion connects the first cover portion and the third cover portion; the bent portion includes the second cover portion and the third cover portion. The box body includes two first box walls opposite each other along the second direction. At least one of the first box walls includes a first box section, a second box section, and a third box section. The first box section and the third box section are respectively connected to the two sides of the second box section along the first direction. The recessed space is formed between the outer surface of the second box section and the outer surface of the third box section. At least a portion of the first cover section covers the outer surface of the first box section, at least a portion of the second cover section covers the outer surface of the second box section, and at least a portion of the third cover section covers the outer surface of the third box section. Along the first direction, the end of the third cover section away from the second cover section is the end of the box cover.

11. The battery device according to claim 5 or 6, characterized in that, At least one of the first cover walls further includes a third cover portion and a fourth cover portion, the third cover portion connecting the second cover portion and the fourth cover portion, the outer surfaces of the second cover portion, the third cover portion, and the fourth cover portion forming a groove recessed toward the receiving cavity, and the bent portion including the second cover portion, the third cover portion, and the fourth cover portion. The enclosure includes two first enclosure walls opposite each other along the second direction. At least one of the first enclosure walls includes a first enclosure portion, a second enclosure portion, a third enclosure portion, and a fourth enclosure portion. The second enclosure portion connects the first enclosure portion and the third enclosure portion. The third enclosure portion connects the second enclosure portion and the fourth enclosure portion. The outer surfaces of the second enclosure portion, the third enclosure portion, and the fourth enclosure portion form a recessed space in the shape of a groove. At least a portion of the first cover portion covers the outer surface of the first enclosure portion. At least a portion of the second cover portion covers the outer surface of the second enclosure portion. At least a portion of the third cover portion covers the outer surface of the third enclosure portion. At least a portion of the fourth cover portion covers the outer surface of the fourth enclosure portion.

12. The battery device according to claim 5 or 6, characterized in that, The enclosure includes two first enclosure walls facing each other along the second direction. At least one of the first enclosure walls includes a first enclosure portion, a second enclosure portion, and a third enclosure portion. The first enclosure portion and the third enclosure portion are respectively connected to two sides of the second enclosure portion along the first direction. The recessed space is formed between the outer surfaces of the second enclosure portion and the outer surfaces of the third enclosure portion. The box body further includes a second box wall, the two ends of which are respectively connected to the third box portion of the two first box walls along the second direction, and the wall thickness direction of the second box wall is the same as that of the first direction.

13. The battery device according to claim 12, characterized in that, At least one of the first box walls further includes a fourth box section, the second box section and the fourth box section are respectively connected to both sides of the third box section along the second direction, and along the first direction, a portion of the outer surface of the second box wall abuts against the inner surface of the fourth box section.

14. The battery device according to claim 12, characterized in that, The end of the third box section away from the second box section is the end of the first box wall.

15. The battery device according to claim 5 or 6, characterized in that, The enclosure includes two first enclosure walls opposite each other along the second direction. At least one of the first enclosure walls includes a first enclosure portion, a second enclosure portion, and a third enclosure portion. The second enclosure portion connects the first enclosure portion and the third enclosure portion. The recessed space is formed between the outer surfaces of the second enclosure portion and the outer surfaces of the third enclosure portion. At least a portion of the first cover portion covers the outer surface of the first enclosure portion, and at least a portion of the second cover portion covers the outer surface of the second enclosure portion. Along the second direction, one end of the second box portion facing the first cover portion abuts against the inner surface of the first cover portion; Along the second direction, one end of the second cover facing the third box portion abuts against the outer surface of the third box portion.

16. The battery device according to claim 15, characterized in that, The lid includes a second cover wall, which connects two first cover walls that are opposite each other along a second direction. The thickness direction of the second cover wall is the same as that of the first direction. Along the first direction, the two ends of the first box part abut against the inner surface of the second cover wall and the inner surface of the second cover part, respectively.

17. The battery device according to claim 15, characterized in that, One of the sides of the first box wall facing the first cover wall and the side of the first cover wall facing the first box wall has a protrusion, and the other has a groove, with the protrusion located within the groove.

18. The battery device according to any one of claims 2 to 6, characterized in that, The battery box also includes two end plates opposite each other along a third direction; The lid includes a second cover wall, which connects two first cover walls that are opposite each other along the second direction; The enclosure includes two first enclosure walls facing each other along the second direction and a second enclosure wall connecting the two first enclosure walls. The second cover wall is disposed opposite to the second enclosure wall along the first direction, and at least a portion of the first cover wall covers the outer surface of the first enclosure walls. The two ends of the end plate along the first direction are respectively connected to the second cover wall and the second box wall, and the two ends of the end plate along the second direction are respectively connected to the first cover wall opposite to it along the second direction. The first direction, the second direction and the third direction intersect each other and are not coplanar.

19. The battery device according to any one of claims 1 to 6, characterized in that, The lid is a one-piece molded structure.

20. An electrical device, characterized in that, The electrical device includes a battery device according to any one of claims 1 to 19, the battery device being used to store electrical energy and supply power to the electrical device.

21. An energy storage device, characterized in that, The energy storage device includes the battery device according to any one of claims 1 to 19, the battery device being used to store electrical energy and provide electrical energy.

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