Battery devices, electrical devices and energy storage devices

Abstract

This application relates to the field of battery technology and discloses a battery device, an electrical device, and an energy storage device. The battery device includes a battery cell assembly, an end plate assembly, and a restraining member. The battery cell assembly includes a plurality of battery cells stacked along a first direction. The end plate assembly includes two end plates disposed at both ends of the battery cell assembly along the first direction. The restraining member surrounds the outer periphery of the end plate assembly and the battery cell assembly. At least one end plate has a weakening structure in its central region to reduce the structural strength of the central region. The battery device provided by this application can improve reliability.

Description

Technical Field

[0001] This application relates to the field of batteries, and in particular to a battery device, an electrical device, and an energy storage device. Background Technology

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of this sustainable development. For electric vehicles, battery technology is a crucial factor in their development.

[0003] The reliability of battery devices is a crucial issue. Therefore, improving the reliability of battery devices is a pressing technical problem that needs to be solved in battery technology. Utility Model Content

[0004] In view of this, embodiments of this application provide a battery device, an electrical device, and an energy storage device to improve the reliability of the battery device.

[0005] In a first aspect, this application provides a battery device, which includes a battery cell assembly, an end plate assembly, and a restraining member. The battery cell assembly includes a plurality of battery cells stacked along a first direction. The end plate assembly includes two end plates disposed at both ends of the battery cell assembly along the first direction. The restraining member surrounds the outer periphery of the end plate assembly and the battery cell assembly. At least one end plate has a weakening structure in its central region, which is used to reduce the structural strength of the central region.

[0006] In the battery device provided in this application embodiment, at least one end plate has a weakening structure in its central region. The weakening structure can reduce the structural strength of the central region. As the battery cell is used, the battery cell will deform. When the battery cell deforms, the weakening structure can make the central region deform along with the battery cell. In this way, the weakening structure can release the internal stress of the battery cell, which can help avoid damage to the internal structure of the battery cell and thermal runaway, thereby improving the reliability of the battery device.

[0007] Therefore, the battery device provided in this application embodiment can improve reliability.

[0008] In some embodiments, the weakening structure includes a recessed structure disposed on the side surface of the end plate opposite to the battery cell.

[0009] By adopting the above technical solution, the central area of ​​at least one end plate can be weakened by a recessed structure, and the recessed structure is set on the side surface of the end plate away from the battery cell, which is convenient for processing.

[0010] In addition, the end plate can transfer the compressive force in the central area to the edge area through the recessed structure, and can also transfer it to the restraint members. This can help reduce the stress on the end plate, thereby improving the load-bearing capacity of the end plate and thus improving the reliability of the battery device.

[0011] In some embodiments, the recessed structure includes a first concave arc surface, and the restraint member includes a first restraint segment located on the side of the end plate away from the battery cell and bypassing the first concave arc surface. The first concave arc surface is arc-shaped at least in the extending direction of the first restraint segment.

[0012] By adopting the above technical solution, the central area of ​​at least one end plate can be weakened by the first concave arc surface, and the compressive force on the end plate can be transmitted to the edge along the arc structure and to the restraint member, which can help reduce the stress on the end plate, thereby improving the load-bearing capacity of the end plate and thus improving the reliability of the battery device.

[0013] Furthermore, after the battery cell deforms, increasing the load-bearing capacity of the end plate can reduce the deformation in the central area of ​​the end plate, which helps to avoid deformation in the edge area of ​​the end plate, thereby improving the structural stability of the battery device and thus improving the reliability of the battery device.

[0014] In some embodiments, the recessed structure includes a groove.

[0015] By adopting the above technical solution, the central area of ​​at least one end plate can be weakened by the groove, which is beneficial to reduce the weight of the end plate and save materials.

[0016] In some implementations, the connection between the bottom wall and the side wall of the groove is a smooth transition.

[0017] By adopting the above technical solution, the compressive force on the bottom wall of the end plate can be transmitted to the side wall and then to the edge of the end plate, which helps to disperse the compressive force in the central area of ​​the end plate, thereby improving the load-bearing capacity of the end plate and thus improving the reliability of the battery device.

[0018] In some embodiments, the weakening structure includes at least a portion of a cavity disposed within the end plate.

[0019] By adopting the above technical solution, the weakening structure can weaken the strength of the central area by utilizing at least part of the cavity inside the end plate, which is beneficial to reducing the weight of the end plate and saving materials.

[0020] In some embodiments, the cavity extends through the end plate along a third direction, which is perpendicular to the first direction and to the enclosure direction of the restraint member.

[0021] By adopting the above technical solution, the compressive force on the end plate in the cavity can be transmitted to the edge of the end plate along the enclosure direction of the restraint member, which helps to disperse the compressive force on the central area of ​​the end plate, thereby improving the load-bearing capacity of the end plate and thus improving the reliability of the battery device.

[0022] In some embodiments, the cavity has a first wall and a second wall that are spaced apart and disposed opposite to each other along a first direction. The first wall is located on the side of the second wall facing the battery cell. The first wall is a second concave arc surface, and the second concave arc surface is recessed along the direction toward the battery cell.

[0023] By adopting the above technical solution, the internal stress of the end plate can be dispersed to both sides along the second concave arc surface, which facilitates the transfer of internal stress to other components (such as restraint components), thereby improving the load-bearing capacity of the end plate and thus improving the reliability of the battery device.

[0024] In some embodiments, the second wall surface is a third concave arc surface, which is recessed in the direction toward the battery cell.

[0025] By adopting the above technical solution, the second wall surface also facilitates the dispersion of the internal stress of at least one of the first end plate and the second end plate to both sides along the second wall surface.

[0026] In some embodiments, a support structure is provided inside the cavity, and the support structure connects the first wall and the second wall.

[0027] By adopting the above technical solution, the support structure connects the first wall and the second wall, which can improve the structural strength of at least one end plate, thereby improving the load-bearing capacity of at least one end plate and thus improving the reliability of the battery device.

[0028] In some embodiments, the side surface of the end plate facing away from the battery cell has a connecting hole that communicates with the cavity.

[0029] By adopting the above technical solution, the connecting hole can work together with the cavity in the central area of ​​the end plate, which can further reduce the structural strength of the central area. As the battery cell is used, when the battery cell deforms, the central area can deform along with the battery cell. The central area can release the internal stress of the battery cell, which can help avoid damage to the internal structure of the battery cell and thermal runaway, thereby improving the reliability of the battery device.

[0030] In some implementations, the wall of the connecting hole smoothly transitions with the wall of the cavity on the side closer to the battery cell.

[0031] By adopting the above technical solution, the compressive force on the end plate in the cavity can be transmitted from the wall surface of the cavity near the battery cell to the wall surface of the connecting hole, and then to the edge of the end plate. This helps to disperse the compressive force in the central area of ​​the end plate, thereby improving the load-bearing capacity of the end plate and thus improving the reliability of the battery device.

[0032] In some embodiments, the opening of the connecting hole is rectangular, and the corners of the opening are chamfered.

[0033] By adopting the above technical solution, the compressive force transmitted from the wall surface of the cavity near the battery cell to the wall surface of the connecting hole is more easily transmitted to the edge of the end plate.

[0034] In some embodiments, the end plate includes two opposing sides along a second direction, which is consistent with the extension direction of the restraint member at the end plate. The connection between the side surface of the end plate away from the battery cell and the side surface is a second chamfer structure. The restraint member contacts the second chamfer structure and bypasses the second chamfer structure.

[0035] By adopting the above technical solution, the end plate can be provided with a second chamfer structure at the connection between the side surface away from the battery cell and the side surface. The second chamfer structure contacts the restraint member, which can increase the contact area with the restraint member, thereby helping to reduce the stress between the end plate and the restraint member.

[0036] In some embodiments, at least one end plate is provided with a mounting hole extending along a third direction, which is perpendicular to the first direction and perpendicular to the enclosure direction of the restraint member; the battery device also includes a housing, battery cells and end plate assemblies are located inside the housing, and at least one end plate is connected to the housing through the mounting hole.

[0037] By adopting the above technical solution, at least one end plate can be connected to the housing through mounting holes, which facilitates the assembly of the battery device.

[0038] In some embodiments, at least one end plate is provided with a weight-reducing hole extending in a third direction.

[0039] By adopting the above technical solution, the weight reduction hole can reduce the weight of at least one end plate, thereby reducing the overall weight of the battery device and saving materials.

[0040] In some embodiments, at least one end plate has a limiting groove on the side opposite to the battery cell, and a restraint member passes through the limiting groove.

[0041] By adopting the above technical solution, at least one end plate can use the limiting groove to limit the restraint member, which helps to avoid misalignment of the restraint member, thereby enabling the restraint member to have a good restraining effect.

[0042] Secondly, this application also provides an electrical device including the battery device of any of the above embodiments. The electrical device provided by this application has the same or similar technical effects as the battery device of any of the above embodiments, and will not be described again here.

[0043] Thirdly, this application also provides an energy storage device, including a battery device according to any of the above embodiments, wherein the battery device is used to store or provide electrical energy. The energy storage device provided by this application has the same or similar technical effects as the battery device according to any of the above embodiments, and will not be described in detail here.

[0044] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0045] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0046] Figure 1 This is a schematic diagram of the structure of an energy storage cabinet provided in some embodiments of this application;

[0047] Figure 2 These are schematic diagrams of the structure of the energy storage container provided in some embodiments of this application;

[0048] Figure 3 These are schematic diagrams of the vehicle structure provided in some embodiments of this application;

[0049] Figure 4 This is an exploded structural diagram of a battery device provided in some embodiments of this application;

[0050] Figure 5 This is one of the structural schematic diagrams of a battery cell assembly provided in some embodiments of this application;

[0051] Figure 6 This is a second schematic diagram of the structure of a battery cell assembly provided in some embodiments of this application;

[0052] Figure 7 yes Figure 6 A magnified view of a portion of point A in the middle;

[0053] Figure 8 yes Figure 6 A magnified view of a portion of point B in the middle;

[0054] Figure 9 This is a three-dimensional structural schematic diagram of the end plate provided in some embodiments of this application;

[0055] Figure 10 This is one of the top view structural schematic diagrams of the end plate provided in some embodiments of this application;

[0056] Figure 11 This is a second top view of the end plate provided in some embodiments of this application;

[0057] Figure 12 This is the third top view of the end plate provided in some embodiments of this application;

[0058] Figure 13 This is a side view of the end plate along a first direction provided in some embodiments of this application;

[0059] Figure 14 This is a side view of the end plate along the second direction provided in some embodiments of this application.

[0060] The markings in the diagram mean:

[0061] Energy storage cabinet 1100; cabinet body 1101; bracket 1102; energy storage container 1200; shell 1201; battery compartment 1202;

[0062] Vehicle 1000; Battery unit 100; Controller 200; Motor 300;

[0063] First housing 110; Second housing 120; Battery cell assembly 130; Battery cell 131; Busbar component 132; End plate 133; First end plate 1331; Second end plate 1332; Restraining member 134; First restraining section 1341; Second restraining section 1342;

[0064] Boundary line 01; Central area 011; Edge area 012;

[0065] Groove 11; connecting hole 12; transition surface 13; first concave arc surface 20; mating surface 31; side surface 32; second chamfer structure 33; cavity 40; first wall surface 41; second wall surface 42; support structure 50; mounting hole 60; weight reduction hole 70; limiting protrusion 80; limiting groove 81. Detailed Implementation

[0066] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0067] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0068] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0069] 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.

[0070] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0071] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0072] In the description of the embodiments of this application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the 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, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0073] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0074] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0075] Unless otherwise specified, all technical features and optional technical features of this application may be combined to form new technical solutions.

[0076] The reliability of battery packs is a critical issue. A battery pack typically consists of a casing and multiple individual battery cells housed within it. During operation, these cells undergo numerous charge-discharge cycles. Side reactions during these cycles generate gas, increasing the internal pressure within the cells. Later in their lifespan, the cells undergo irreversible deformation. However, battery packs often use end plates to restrain this deformation, which increases internal stress within the cells. This stress on other components (such as the cell top cover and other aluminum casings) increases the overall risk to the battery pack and ultimately affects battery reliability.

[0077] In view of this, embodiments of this application provide a battery device, which includes a battery cell assembly, an end plate assembly, and a restraining member. The battery cell assembly includes a plurality of battery cells stacked along a first direction. The end plate assembly includes two end plates disposed at both ends of the battery cell assembly along the first direction. The restraining member surrounds the outer periphery of the end plate assembly and the battery cell assembly. At least one end plate is provided with a weakening structure, which is disposed in the central region of at least one end plate and is used to reduce the structural strength of the central region.

[0078] In the battery device provided in this application embodiment, at least one end plate is provided with a weakening structure. The weakening structure can reduce the structural strength of the central region. As the battery cell is used, the battery cell will deform. When the battery cell deforms, the weakening structure can make the central region deform along with the battery cell. In this way, the weakening structure can release the internal stress of the battery cell, which can help avoid damage to the internal structure of the battery cell and thermal runaway, thereby improving the reliability of the battery device.

[0079] The technical solutions described in the embodiments of this application are applicable to energy storage devices and electrical devices that use battery devices.

[0080] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0081] The battery cell 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.

[0082] The battery device disclosed in this application can be used in electrical devices that use the battery device as a power source or in various energy storage systems that use the battery device as an energy storage element. Electrical devices include, for example, mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships, and spacecraft. Spacecraft include, for example, airplanes, rockets, space shuttles, and spacecraft.

[0083] The energy storage device provided in this application includes one or more battery clusters to improve the voltage and capacity of the energy storage device. A battery cluster may include multiple battery devices, which are connected in series via a busbar to increase the voltage of the energy storage device. When the energy storage device includes multiple battery clusters, the multiple battery clusters are connected in parallel to increase the capacity of the energy storage device.

[0084] Energy storage devices can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems. Energy storage devices can store electrical energy as needed and output it when appropriate. For example, an energy storage device can store electrical energy during off-peak hours and provide power to relevant users or electrical equipment during peak hours. The energy storage system provided in this application embodiment can be any power system that requires energy storage devices.

[0085] In some embodiments, the energy storage device is an energy storage container or an energy storage cabinet.

[0086] In some embodiments, please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of an energy storage cabinet 1100 provided in some embodiments of this application. The energy storage cabinet 1100 may include a cabinet body 1101 and one or more battery clusters, with the battery clusters housed in the cabinet body 1101. A bracket 1102 is provided inside the cabinet body 1101, on which the battery device 100 can be placed.

[0087] In some embodiments, please refer to Figure 2 , Figure 2This is a schematic diagram of the structure of an energy storage container 1200 provided in some embodiments of this application. The energy storage container 1200 may include a housing 1201 and one or more battery clusters, with the battery clusters housed in the housing 1201. A battery compartment 1202 is provided inside the housing 1201, and the battery device 100 can be placed in the battery compartment 1202.

[0088] For ease of explanation, the following embodiments will be described using a vehicle 1000 as an example of an electrical device according to an embodiment of this application.

[0089] Please refer to Figure 3 , Figure 3 This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of this application. The vehicle 1000 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 electric vehicles, etc. A battery device 100 is provided inside the vehicle 1000, and the battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

[0090] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0091] refer to Figure 4 , Figure 4 This is an exploded structural diagram of a battery device 100 provided in some embodiments of this application. The battery device 100 mentioned in the embodiments of this application may include one or more battery cell assemblies 130 for providing voltage and capacity. The battery cell assembly 130 may include multiple battery cells 131, which are connected in series, parallel, or mixed connection through a busbar 132.

[0092] In some embodiments, multiple battery cells 131 in the battery device 100 can be electrically connected through a busbar 132 to achieve parallel, series, or mixed connection of multiple battery cells 131 in the battery device 100.

[0093] Please see Figure 5 , Figure 5This is one of the structural schematic diagrams of a battery cell assembly 130 provided in some embodiments of this application. In some embodiments, the battery cell assembly 130 is typically formed by arranging multiple battery cells 131. As an example, the battery cell assembly 130 can be a battery module, which is formed by arranging and fixing multiple battery cells 131 to form an independent module. As an example, a battery module can be formed by binding multiple battery cells 131 together with cable ties.

[0094] Please see Figure 6 , Figure 6 This is a second schematic diagram of the structure of a battery cell assembly 130 provided in some embodiments of this application. In some embodiments, the battery device 100 can be a battery pack, which includes a housing and one or more battery cell assemblies 130, with the battery cell assembly 130 housed in the housing.

[0095] Please continue reading. Figure 4 As an example, the battery cell assembly 130 can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0096] As an example, the battery cell assembly 130 can also be housed in the housing by directly fixing multiple battery cells 131 to the housing.

[0097] As an example, the enclosure may include a first enclosure 110 (upper enclosure) and a second enclosure 120 (lower enclosure). The first enclosure 110 and the second enclosure 120 are fastened together to form a closed receiving cavity inside the enclosure to house the battery cell assembly 130. Here, "closed" refers to covering or closing, and can be either sealed or unsealed.

[0098] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, forming a closed receiving cavity inside the enclosure to house the battery cell assembly 130.

[0099] As an example, the housing may be part of the chassis structure of vehicle 1000. For instance, the top cover of the housing may be at least part of the floor of vehicle 1000, or the frame of the housing may be at least part of the crossbeams and longitudinal beams of vehicle 1000.

[0100] Please continue reading. Figure 6 and combined Figure 7 and Figure 8 , Figure 7 yes Figure 6 A magnified view of a portion of point A in the diagram. Figure 8 yes Figure 6A partially enlarged schematic diagram at point B. In some embodiments, the battery device 100 provided in this application further includes an end plate assembly, which includes a plurality of end plates 133. For example, the end plate assembly includes two end plates 133 disposed at both ends of the battery cell assembly 130 along a first direction (the Y direction in the figure). The two end plates 133 may include a first end plate 1331 and a second end plate 1332, which are spaced apart and opposite to each other along the first direction, and are disposed at both ends of the battery cell assembly 130 along the first direction (the Y direction in the figure).

[0101] The battery device 100 provided in this application embodiment also includes a restraint member 134. The restraint member 134 is disposed around the outer periphery of the end plate assembly and the battery cell assembly 130. The restraint member 134 can bind and restrain both the end plate assembly and the battery cell assembly 130, which is beneficial to the structural stability of the battery device 100.

[0102] Optionally, the surface of the end plate 133 facing the battery cell 131 is a bonding surface 31, which can be bonded to the battery cell 131. Optionally, a protective structure can be provided between the battery cell 131 and the bonding surface 31.

[0103] At least one end plate 133 has a weakening structure in its central region 011. That is, at least one of the first end plate 1331 and the second end plate 1332 has a weakening structure in its central region 011. The weakening structure is used to reduce the structural strength of the central region 011.

[0104] Optionally, the central region 011 is a closed region at the center of the end plate 133, and the outer periphery of the central region 011 is the edge region 012, which surrounds the central region 011. There is a ring-shaped boundary line 01 between the edge region 012 and the central region 011. Of course, the boundary line 01 is only used to indicate the transition position between the central region 011 and the edge region 012, and its specific location is not strictly limited. Similarly, the central region 011 and the edge region 012 are relative, with the central region inside and the edge region outside. Their shapes are also not strictly limited, and the geometric center of the central region 011 is not necessarily located at the geometric center of the end plate surface. Similarly, the area ratio of the two on the end plate surface is not strictly limited. For ease of understanding, Figure 7 The diagram shows the central region 011, the edge region 012, and the dividing line 01 separating the central region 011 and the edge region 012.

[0105] Please see Figure 9 , Figure 9This is a three-dimensional structural schematic diagram of the end plate 133 provided in some embodiments of this application. Optionally, the central region 011 is the middle region of the end plate 133 in the second direction (X direction in the figure). Along the second direction, the central region 011 is located between two edge regions 012. There is a dividing line 01 between the edge regions 012 and the central region 011 extending in a straight line direction (e.g., Z direction in the figure).

[0106] As an example, the first end plate 1331 is provided with a weakening structure.

[0107] As an example, the second end plate 1332 is provided with a weakening structure.

[0108] As an example, both the first end plate 1331 and the second end plate 1332 are provided with weakening structures.

[0109] It is understandable that as the battery device 100 is used, the battery cell 131 will deform. When the battery cell 131 deforms, the weakening structure can make the central region 011 deform along with the battery cell 131. The weakening structure can release the internal stress of the battery cell 131, which can help avoid damage to the internal structure of the battery cell 131 and thermal runaway, thereby improving the reliability of the battery device 100.

[0110] In some embodiments, the weakening structure includes a recessed structure disposed on the side surface of the end plate 133 opposite to the battery cell 131. In this way, the central region of at least one end plate 133 can be weakened by the recessed structure, and the recessed structure being disposed on the side surface of the end plate 133 opposite to the battery cell 131 facilitates processing.

[0111] In addition, the end plate 133 can transfer the compressive force on the central region 011 to the edge region 012 through the recessed structure, and can also transfer it to the restraint member 134, which can help reduce the stress on the end plate 133, thereby helping to improve the load-bearing capacity of the end plate 133, and thus helping to improve the reliability of the battery device 100.

[0112] It is understood that the battery device 100 provided in this application embodiment improves the load-bearing capacity of the end plate 133 through the recessed structure, which can help avoid setting a reinforcing structure (e.g., steel tie rod) on the third direction (Z direction in the figure), thereby helping to reduce the size (e.g., height) of the battery device in the third direction and help to reduce costs.

[0113] Please see Figure 6 , Figure 7 and Figure 8 and combined Figure 9 and Figure 10 , Figure 10This is one of the top view structural schematic diagrams of the end plate 133 provided in some embodiments of this application. In some embodiments, the recessed structure has a first concave arc surface 20, which is recessed in the direction toward the battery cell 131. The restraining member 134 also includes a first restraining segment 1341, which is located on the side of the end plate 133 away from the battery cell 131, and the first restraining segment 1341 bypasses the first concave arc surface 20. The first restraining segment 1341 is spaced apart from the first concave arc surface 20, that is, the portion of the first restraining segment 1341 that bypasses the first concave arc surface 20 is suspended.

[0114] Optionally, the first concave surface is curved at least in the extension direction of the first binding segment 1341 (the X direction in the figure). In one example, the first concave surface can be a cylinder, the central axis of which can extend along the Z direction, and the first concave surface is curved in the X direction. In another example, the first concave surface can be a sphere, and the first concave surface is curved in various directions perpendicular to the Y direction.

[0115] As an example, the surface of the first end plate 1331 facing away from the battery cell 131 is provided with a first concave arc surface 20, which is recessed in the direction toward the battery cell 131. The compressive force on the first end plate 1331 can be transmitted to the edge along the arc structure and to the restraining member 134. That is, the compressive force on the first end plate 1331 can be transmitted along the arc direction of the first concave arc surface 20 to the portions of the first end plate 1331 on both sides of the first concave arc surface 20, and the restraining member 134 fits against the portions of the first end plate 1331 on both sides of the first concave arc surface 20, so that the compressive force on the first end plate 1331 can be transmitted to the restraining member 134. Therefore, the restraining member 134 and the first concave arc surface help to reduce the stress on the first end plate 1331, thereby helping to improve the load-bearing capacity of the first end plate 1331.

[0116] As an example, the surface of the second end plate 1332 facing away from the battery cell 131 is provided with a first concave arc surface 20, which is recessed in the direction toward the battery cell 131. The compressive force on the second end plate 1332 can be transmitted to the edge along the arc structure and to the restraining member 134. That is, the compressive force on the second end plate 1332 can be transmitted along the arc direction of the first concave arc surface 20 to the portions of the second end plate 1332 on both sides of the first concave arc surface 20, and the restraining member 134 is in contact with the portions of the second end plate 1332 on both sides of the first concave arc surface 20, so that the compressive force on the second end plate 1332 can be transmitted to the restraining member 134. Therefore, the restraining member 134 and the first concave arc surface help to reduce the stress on the second end plate 1332, thereby helping to improve the load-bearing capacity of the second end plate 1332.

[0117] As an example, the surfaces of the first end plate 1331 and the second end plate 1332 facing away from the battery cell 131 are both provided with a first concave arc surface 20.

[0118] It is understood that the compressive force on at least one end plate 133 (at least one of the first end plate 1331 and the second end plate 1332) can be transmitted to the edge along the arc direction of the first concave arc surface 20 and to the restraint member 134, which can help reduce the stress on the end plate 133, thereby helping to improve the load-bearing capacity of the end plate 133 and thus helping to improve the reliability of the battery device 100.

[0119] Furthermore, after the battery cell 131 is deformed, by increasing the load-bearing capacity of at least one end plate 133, the deformation of the central region 011 of at least one end plate 133 can be reduced. This helps to avoid excessive deformation causing deformation of the edge region 012 of the end plate 133, thereby improving the structural stability of the battery device 100 and thus improving the reliability of the battery device 100.

[0120] Please see Figure 7 and Figure 8 In some embodiments, the first binding segment 1341 extends along a second direction (X direction in the figure), and the first binding segment 1341 is located on the side of the end plate 133 opposite to the battery cell 131, with the first direction perpendicular to the second direction. It can be understood that the binding member 134 is a closed loop structure surrounding multiple battery cells 131, with the first end plate 1331 and the second end plate 1332 respectively abutting against the outer surface of the large surface of the battery cell 131 at the end. The first binding segment 1341 is the portion of the binding member 134 corresponding to the first end plate 1331 and the second end plate 1332. There are two first binding segments 1341, spaced apart and opposite to each other along the first direction, with the first binding segment 1341 provided on the side of the first end plate 1331 and the second end plate 1332 opposite to the battery cell 131.

[0121] The restraint member 134 also includes two second restraint segments 1342, which extend along a first direction and are spaced apart and opposite to each other along a second direction. Along the second direction, the battery cell 131 is located between the two second restraint segments 1342. The two first restraint segments 1341 and the two second restraint segments 1342 are alternately connected to form a closed loop structure surrounding the plurality of battery cells 131.

[0122] The first binding segment 1341 bypasses the first concave arc surface 20 and, along the second direction, the distance between the first binding segment 1341 and the first concave arc surface 20 first increases and then decreases.

[0123] Optionally, the surface of the first end plate 1331 facing away from the battery cell 131 is provided with a first concave arc surface 20, and the first end plate 1331 can transmit the pressure received to the first binding segment 1341 corresponding to the first end plate 1331.

[0124] Optionally, the surface of the second end plate 1332 facing away from the battery cell 131 is provided with a first concave arc surface 20, and the second end plate 1332 can transmit the pressure received to the first restraint section 1341 corresponding to the second end plate 1332.

[0125] It is understood that the compressive force on at least one end plate 133 can be transmitted to the restraint member 134, which can help reduce the stress on the end plate 133, thereby helping to improve the load-bearing capacity of the end plate 133 and thus helping to improve the reliability of the battery device 100.

[0126] Please see Figure 7 In some embodiments, the recessed structure includes a groove 11.

[0127] As an example, a groove 11 is provided on the side surface of the first end plate 1331 facing away from the battery cell 131. The groove 11 can reduce the thickness of the central region 011 of the first end plate 1331, thereby weakening the structural strength of the central region 011 of the first end plate 1331, so that the central region 011 of the first end plate 1331 can deform with the battery cell 131, thereby releasing the internal stress of the battery cell 131.

[0128] As an example, a groove 11 is provided on the side surface of the second end plate 1332 facing away from the battery cell 131. The groove 11 can reduce the thickness of the central region 011 of the second end plate 1332, thereby weakening the structural strength of the central region 011 of the second end plate 1332, so that the central region 011 of the second end plate 1332 can deform with the battery cell 131, thereby releasing the internal stress of the battery cell 131.

[0129] As an example, both the first end plate 1331 and the second end plate 1332 have grooves 11 on the side surface facing away from the battery cell 131.

[0130] Therefore, the battery device of this application embodiment can weaken the strength of the central region 011 of the end plate 133 through the groove 11, which is beneficial to reduce the weight of the end plate 133 and also to save materials.

[0131] In some embodiments, the connection between the bottom wall and the side wall of the groove 11 is smoothly transitioned. For example, a transition surface 13 is provided at the connection between the bottom wall and the side wall of the groove 11. This transition surface can be a concave arc surface recessed in a direction away from the inner cavity of the groove 11. In this way, the compressive force on the end plate 133 at the bottom wall of the groove 11 can be transmitted from the transition surface 13 to the side wall, and then to the edge of the end plate 133. This helps to disperse the compressive force on the central region 011 of the end plate 133, thereby improving the load-bearing capacity of the end plate 133 and consequently improving the reliability of the battery device 100.

[0132] Please see Figure 11 and Figure 12 , Figure 11 This is the second top view of the end plate 133 provided in some embodiments of this application. Figure 12 This is a third top view of the end plate 133 provided in some embodiments of this application. In some embodiments, the weakening structure includes at least a portion of the cavity 40 disposed inside the end plate 133.

[0133] As an example, cavity 40 is disposed inside the first end plate 1331. Cavity 40 can weaken the structural strength of the central region 011 of the first end plate 1331, so that the central region 011 of the first end plate 1331 can deform along with the battery cell 131, thereby releasing the internal stress of the battery cell 131.

[0134] As an example, cavity 40 is disposed inside the second end plate 1332. Cavity 40 can weaken the structural strength of the central region 011 of the second end plate 1332, so that the central region 011 of the second end plate 1332 can deform along with the battery cell 131, thereby releasing the internal stress of the battery cell 131.

[0135] As an example, both the first end plate 1331 and the second end plate 1332 have cavities 40 inside.

[0136] Optionally, the cavity 40 may be located in the central region 011 of the end plate 133.

[0137] It is understood that the weakening structure can weaken the strength of the central region 011 of at least one end plate 133 through the cavity 40. When the battery cell 131 is deformed, the central region 011 of the end plate 133 can provide clearance space for the battery cell 131 through deformation, so that the battery cell 131 can be deformed and the internal stress of the battery cell 131 can be released. This can help avoid damage to the internal structure of the battery cell 131 and thermal runaway, thereby improving the reliability of the battery device 100.

[0138] Please continue reading. Figure 11 and Figure 12 In some embodiments, the cavity 40 penetrates the end plate 133 along a third direction, which is perpendicular to the first direction and to the enclosure direction of the restraint member 134.

[0139] It is understandable that the compressive force on the end plate 133 at the cavity 40 can be transmitted to the edge of the end plate 133 along the enclosure direction of the restraint member 134, which helps to disperse the compressive force on the central region 011 of the end plate 133, thereby improving the load-bearing capacity of the end plate 133 and thus improving the reliability of the battery device 100.

[0140] In some embodiments, the cavity 40 has a first wall surface 41 and a second wall surface 42 spaced apart and disposed opposite to each other along a first direction. The first wall surface 41 is located on the side of the second wall surface 42 facing the battery cell 131. The first wall surface 41 is a second concave arc surface, which is concave along the direction toward the battery cell 131.

[0141] As an example, the first end plate 1331 has a cavity 40 inside, and the internal stress of the first end plate 1331 can be distributed to both sides along the second concave arc surface.

[0142] As an example, the interior of the second end plate 1332 is provided with a cavity 40, and the internal stress of the second end plate 1332 can be distributed to both sides along the second concave arc surface.

[0143] As an example, both the first end plate 1331 and the second end plate 1332 have cavities 40 inside.

[0144] It is understood that at least one end plate 133 has a cavity 40 inside and forms a second concave arc surface, so that the internal stress of the end plate 133 can be distributed to both sides along the second concave arc surface. This facilitates the transfer of internal stress to other components (such as the restraint member 134), thereby improving the load-bearing capacity of the end plate 133 and thus improving the reliability of the battery device 100.

[0145] In the battery device 100 of this application embodiment, the first concave arc surface 20 and the second concave arc surface can make the end plate 133 form a double arch structure, which can further improve the reliability of the battery device 100.

[0146] In some embodiments, the second wall surface 42 is a third concave arc surface, which is recessed in the direction toward the battery cell 131. It is understood that when the second wall surface 42 is configured as a third concave arc surface, it also facilitates the dispersion of internal stress of the end plate 133 to both sides along the second wall surface 42. The arc center of the second wall surface 42 may coincide with the arc center of the first concave arc surface 20.

[0147] In some embodiments, a support structure 50 is provided within the cavity 40, and the support structure 50 connects the first wall surface 41 and the second wall surface 42. For example, the first end plate 1331 is provided with the support structure 50 connecting the first wall surface 41 and the second wall surface 42. For example, the second end plate 1332 is provided with the support structure 50 connecting the first wall surface 41 and the second wall surface 42. For example, both the first end plate 1331 and the second end plate 1332 are provided with the support structure 50 connecting the first wall surface 41 and the second wall surface 42.

[0148] The support structure 50 can improve the structural strength of the end plate 133, thereby improving the load-bearing capacity of the end plate 133 and thus improving the reliability of the battery device 100.

[0149] Please see Figure 13 , Figure 13 This is a side view of the end plate 133 along a first direction according to some embodiments of this application. In some embodiments, the end plate 133 has a connecting hole 12 on the side surface opposite to the battery cell 131, and the connecting hole 12 communicates with the cavity 40.

[0150] It is understandable that the connecting hole 12 penetrates a part of the connecting cavity 40 of the end plate 133. The connecting hole 12 and the cavity 40 can work together in the central region 011 of the end plate 133, which can further reduce the structural strength of the central region 011.

[0151] As the battery device 100 is used, the battery cell 131 deforms. When the battery cell 131 deforms, the central region 011 of the end plate 133 can deform along with the battery cell 131, providing clearance for the battery cell 131 and allowing it to deform. In this way, the end plate 133 can release the internal stress of the battery cell 131, thereby helping to avoid damage to the internal structure of the battery cell and thermal runaway, and thus improving the reliability of the battery device.

[0152] Optionally, a smooth transition is provided between the wall surface of the connecting hole 12 and the wall surface of the cavity 40 near the battery cell 131. For example, a transition surface 13 is provided between the wall surface of the connecting hole 12 and the wall surface of the cavity 40 near the battery cell 131. The transition surface 13 can be a concave arc surface that is recessed in the direction away from the connecting hole 12.

[0153] It is understandable that the compressive force on the end plate 133 at the cavity 40 can be transmitted from the wall of the cavity 40 near the battery cell 131 to the wall of the connecting hole 12, and then to the edge of the end plate 133. This helps to disperse the compressive force on the central region 011 of the end plate 133, thereby improving the load-bearing capacity of the end plate 133 and thus improving the reliability of the battery device 100.

[0154] In some embodiments, the opening of the connecting hole 12 is rectangular, and the corners of the opening are chamfered. The chamfered corners are a first chamfer structure 34, which allows the wall surface of the connecting hole 12 to transition with the side wall of the end plate 133 facing away from the battery cell 131, facilitating the transmission of force from the wall surface of the connecting hole 12 to the edge of the end plate 133. In this way, the compressive force transmitted from the wall surface of the cavity 40 near the battery cell 131 to the wall surface of the connecting hole 12 is more easily transmitted to the edge of the end plate 133.

[0155] Optionally, the first chamfer structure 34 can be a rounded corner or a beveled corner.

[0156] Please see Figure 7 and Figure 13 In some embodiments, the end plate 133 includes two opposing side surfaces 32 along a second direction, which is consistent with the extending direction of the restraint member 134 at the end plate 133. The connection between the side surface of the end plate 133 facing away from the battery cell 131 and the side surface 32 is a chamfered structure. The chamfered structure at the connection between the side surface of the end plate 133 facing away from the battery cell 131 and the side surface 32 is a second chamfered structure 33. The restraint member 134 contacts the second chamfered structure 33 and bypasses the second chamfered structure 33.

[0157] The second chamfer structure 33 can be a rounded corner or a beveled corner. In this way, the restraint member 134 fits into the second chamfer structure 33, and the restraint member 134 can transition at the corner, which can increase the bending angle of the restraint member 134. This can help reduce the stress in contact between the end plate 133 and the restraint member 134, thereby improving the reliability of the restraint member 134.

[0158] In addition, the end plate 133 contacts the restraint member through a chamfered structure, which can increase the contact area with the restraint member 134, thereby helping to reduce the stress in the contact between the end plate 133 and the restraint member 134, and thus helping to improve the reliability of the restraint member 134.

[0159] In some embodiments, at least one end plate 133 is provided with a mounting hole 60 extending along a third direction (e.g., the Z direction in the figure), the third direction being perpendicular to the first direction. The battery cell 131 and the end plate assembly are located on one side of the first housing 110 along the third direction, and at least one end plate 133 is connected to the first housing 110 through the mounting hole 60.

[0160] As an example, the first end plate 1331 is connected to the first housing 110 through the mounting hole 60.

[0161] As an example, the second end plate 1332 is connected to the first housing 110 through the mounting hole 60.

[0162] As an example, both the first end plate 1331 and the second end plate 1332 can be connected to the first housing 110 through the mounting holes 60.

[0163] In this way, at least one end plate 133 can be connected to the first housing 110 through the mounting hole 60, which facilitates the assembly of the battery device 100.

[0164] In some embodiments, mounting holes 60 may be provided on the support structure 50, so that at least one end plate 133 can be connected to the first housing 110 through the mounting holes 60.

[0165] Optionally, the mounting hole 60 can also be used to connect the busbar component 132 and the end plate 133. That is, the busbar component 132 can be mounted on the end plate 133 through the mounting hole 60.

[0166] In some embodiments, at least one end plate 133 is provided with a weight-reducing hole 70 extending in a third direction. For example, a first end plate 1331 is provided with a weight-reducing hole 70. For example, a second end plate 1332 is provided with a weight-reducing hole 70. For example, both the first end plate 1331 and the second end plate 1332 are provided with weight-reducing holes 70.

[0167] In this way, the weight reduction hole 70 can reduce the weight of at least one end plate 133, thereby reducing the overall weight of the battery device 100 and saving materials.

[0168] Optionally, the side wall of the weight-reducing hole 70 facing the battery cell 131 is a concave arc surface. In this way, the stress of the end plate 133 at the weight-reducing hole 70 can also be dispersed to both sides along the concave arc surface of the weight-reducing hole 70.

[0169] Please see Figure 7 and Figure 13 and combined Figure 14 , Figure 14 This is a side view of the end plate 133 along a second direction according to some embodiments of this application. In some embodiments, at least one end plate 133 has a limiting groove 81 on the side opposite to the battery cell 131, and a restraining member 134 passes through the limiting groove 81.

[0170] Optionally, at least one end plate 133 has a limiting protrusion 80 on the side opposite to the battery cell 131, and a limiting groove 81 is formed on the limiting protrusion 80. This can help avoid slotting on the end plate 133 and improve the structural strength of the end plate 133.

[0171] As an example, the first end plate 1331 has a limiting protrusion 80 on the side opposite to the battery cell 131, and the limiting protrusion 80 has a limiting groove 81.

[0172] As an example, the second end plate 1332 has a limiting protrusion 80 on the side opposite to the battery cell 131, and the limiting protrusion 80 has a limiting groove 81.

[0173] As an example, the first end plate 1331 and the second end plate 1332 are provided with a limiting protrusion 80 on the side opposite to the battery cell 131, and the limiting protrusion 80 is provided with a limiting groove 81.

[0174] In this way, at least one end plate 133 can use the limiting groove 81 to limit the restraint member 134, which helps to prevent the restraint member 134 from being misaligned, thereby enabling the restraint member 134 to have a good restraining effect.

[0175] Secondly, embodiments of this application also provide an electrical device, including the battery device 100 of any of the above embodiments.

[0176] The power supply device provided in this application has the same or similar technical effects as the battery device 100 in any of the above embodiments, and will not be described again here.

[0177] Thirdly, this application also provides an energy storage device, including the battery device 100 of any of the above embodiments, wherein the battery device 100 is used to store or provide electrical energy. The energy storage device provided by this application has the same or similar technical effects as the battery device 100 of any of the above embodiments, and will not be described again here.

[0178] In some embodiments, the energy storage device may include modules such as a thermal management module, a main control module, a central control module, a power distribution module, and a fire protection module.

[0179] As an example, the thermal management module may include a liquid cooling unit that supplies coolant to each battery device 100 via piping for regulating the temperature of the individual battery cells 131.

[0180] As an example, the main control module can serve as the battery management unit for the battery cluster, used to monitor and manage the battery cluster. The main control module can monitor information such as the current, voltage, power, or temperature of the battery cluster. For instance, it can control the charging and discharging current and voltage of the battery cluster. The main control module includes modules such as an auxiliary battery management unit (SBMU) and a fusion switch.

[0181] As an example, the central control module can serve as the battery management unit for an energy storage device, used to monitor and manage the device. The central control module can monitor information such as the energy storage device's current, voltage, power, state of charge, or temperature. For instance, it can control the charging and discharging current and voltage of the energy storage device. As an example, the central control module includes modules such as an Insulation Monitoring Module (IMM), a Master Battery Management Unit (MBMU), an Ethernet (ETH) module, and a fiber optic conversion module.

[0182] As an example, the fire protection module includes a control panel, detectors, alarm devices, etc., used to detect, alarm, or extinguish fires in the energy storage system.

[0183] As an example, a power distribution module can be used to distribute power to modules in an energy storage device that require electricity.

[0184] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. 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 of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A battery device, characterized in that, include: A battery cell assembly includes a plurality of battery cells stacked along a first direction; The end plate assembly includes two end plates disposed at both ends of the battery cell assembly along a first direction; A restraint member is provided around the outer periphery of the end plate assembly and the battery cell assembly; At least one of the end plates has a weakening structure in its central region, the weakening structure being used to reduce the structural strength of the central region.

2. The battery device as claimed in claim 1, characterized in that, The weakening structure includes a recessed structure, which is disposed on the side surface of the end plate opposite to the battery cell.

3. The battery device as claimed in claim 2, characterized in that, The recessed structure includes a first concave arc surface, and the restraining member includes a first restraining segment. The first restraining segment is located on the side of the end plate away from the battery cell and passes around the first concave arc surface. The first concave arc surface is arc-shaped at least in the extending direction of the first restraining segment.

4. The battery device as claimed in claim 2, characterized in that, The recessed structure includes a groove.

5. The battery device as claimed in claim 4, characterized in that, The bottom wall and side wall of the groove have a smooth transition at the connection.

6. The battery device as claimed in claim 1, characterized in that, The weakening structure includes a cavity disposed inside the end plate.

7. The battery device as claimed in claim 6, characterized in that, The cavity extends through the end plate along a third direction, which is perpendicular to the first direction and also perpendicular to the enclosure direction of the restraint member.

8. The battery device as claimed in claim 6, characterized in that, The cavity has a first wall and a second wall that are spaced apart and opposite to each other along the first direction. The first wall is located on the side of the second wall facing the battery cell. The first wall is a second concave arc surface, and the second concave arc surface is recessed along the direction towards the battery cell.

9. The battery device as claimed in claim 8, characterized in that, The second wall surface is a third concave arc surface, which is concave in the direction toward the battery cell.

10. The battery device as claimed in claim 8, characterized in that, The cavity is provided with a support structure, which connects the first wall and the second wall.

11. The battery device as claimed in claim 6, characterized in that, The end plate has a connecting hole on the side surface opposite to the battery cell, and the connecting hole communicates with the cavity.

12. The battery device as claimed in claim 11, characterized in that, The wall surface of the connecting hole smoothly transitions with the wall surface of the cavity on the side closer to the battery cell.

13. The battery device as claimed in claim 11, characterized in that, The opening of the connecting hole is rectangular, and the corners of the opening are chamfered.

14. The battery device according to any one of claims 1 to 13, characterized in that, The end plate includes two opposite sides along a second direction, which is consistent with the extension direction of the restraint member at the end plate. The connection between the side surface of the end plate away from the battery cell and the side surface is a second chamfer structure. The restraint member contacts the second chamfer structure and bypasses the second chamfer structure.

15. The battery device according to any one of claims 1 to 13, characterized in that, At least one of the end plates is provided with a mounting hole extending along a third direction, the third direction being perpendicular to the first direction and perpendicular to the enclosure direction of the restraint member; The battery device also includes a housing, the battery cells and the end plate assembly are located inside the housing, and at least one end plate is connected to the housing through the mounting hole.

16. The battery device as claimed in claim 15, characterized in that, At least one of the end plates is provided with a weight-reducing hole extending in a third direction.

17. The battery device according to any one of claims 1 to 13, characterized in that, At least one of the end plates has a limiting groove on the side opposite to the battery cell, and the restraint member passes through the limiting groove.

18. An electrical appliance, characterized in that, Includes the battery device as described in any one of claims 1-17.

19. An energy storage device, characterized in that, Includes the battery device as described in any one of claims 1-17, the battery device being used to store or provide electrical energy.

Images