Battery devices and electrical equipment

Abstract

This application discloses a battery device and an electrical appliance. A housing is formed within the housing, which includes at least two limiting beams arranged opposite each other along a first direction. A cover includes a main body, a first connecting portion, and a second connecting portion. The first connecting portion protrudes into the housing relative to the main body, and the second connecting portion also protrudes into the housing relative to the main body. At least two second connecting portions are arranged opposite each other along the first direction. A battery cell assembly is housed within the housing, comprising multiple battery cells. Each end of the battery cell assembly along the first direction abuts against two limiting beams. The first connecting portion extends along the first direction and connects to the two limiting beams, and also connects to the multiple battery cells. The second connecting portion is arranged along a second direction corresponding to and connected to the limiting beams, thereby improving the structural stability and reliability of the battery device.

Description

Technical Field

[0001] This application relates to the field of batteries, and more specifically, to a battery device and an electrical appliance. 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] In the development of battery technology, limiting beams are typically installed inside the battery pack to confine individual battery cells. However, in actual use, battery cells generate expansion forces during charging and discharging, and vehicle vibrations can also cause displacement of the cells. Usually, additional clamping components are added to the battery pack for confinement and to work in conjunction with the limiting beams to resist expansion forces. This design occupies considerable space within the battery pack and has poor resistance to expansion forces, resulting in lower structural stability and reliability. Therefore, how to design battery packs to improve their structural stability and reliability is a pressing technical problem in battery technology. Utility Model Content

[0004] This application provides a battery device and an electrical appliance that can improve the structural stability and reliability of the battery device.

[0005] In a first aspect, a battery device is provided, comprising a housing, a cover, and a battery cell assembly. The housing has a receiving space, and the housing includes at least two limiting beams disposed opposite each other along a first direction. The cover closes to and is connected to the housing along a second direction to enclose the receiving space. The cover includes a main body and a first connecting portion, the first connecting portion protruding into the housing relative to the main body, the first direction being perpendicular to the second direction. The battery cell assembly is housed within the receiving space, the battery cell assembly comprising multiple battery cells, and both ends of the battery cell assembly along the first direction abut against the two limiting beams. The first connecting portion extends along the first direction and connects the two limiting beams, and / or the first connecting portion connects the multiple battery cells.

[0006] In the embodiment of this application, the first connecting part protrudes into the housing relative to the main body and extends along the first direction to connect two limiting beams and / or connect multiple battery cells. Thus, the first connecting part acts as a clamping member connecting the limiting beams and / or battery cell assemblies, restricting the movement of the battery cell assemblies. This saves space in the second direction without adding independent clamping members, thereby improving the energy density of the battery device. In addition, the first connecting part connects the two limiting beams into a whole. When the battery cell assembly generates expansion force due to charging and discharging, the expansion force is transmitted to the cover through the limiting beams and the first connecting part in sequence, so that the cover participates in bearing the load. This disperses and suppresses the expansion deformation of the limiting beams, while improving the overall modal and torsional strength of the housing and cover assembly, thereby improving the structural stability and reliability of the battery device.

[0007] In some embodiments, the battery cell assembly includes multiple battery cell rows, each battery cell row includes multiple battery cells arranged along a first direction, two adjacent battery cell rows are arranged along a third direction, the orthographic projection of the first connection portion along the second direction overlaps with the two adjacent battery cell rows in the third direction, and the first direction, the second direction and the third direction are perpendicular to each other.

[0008] In the embodiments of this application, by setting the first connecting part, the space occupied by the clamping member in the height direction is eliminated, thereby improving the space utilization rate inside the battery device and thus increasing the energy density of the battery device. At the same time, the first connecting part directly abuts between two battery cell rows, which can simultaneously restrict the relative movement of adjacent battery cell rows in any direction, playing a limiting role. This can suppress the displacement of battery cells under charging and discharging expansion or vibration conditions, and improve structural stability. In addition, when the battery cell generates expansion force, the expansion force can be directly transmitted to the cover through the first connecting part, so that the cover participates in bearing the expansion force, thereby dispersing the expansion load borne by the limiting beam, reducing the deformation risk of the limiting beam, and further improving the overall structural rigidity and torsional strength of the battery device.

[0009] In some embodiments, the first connecting portion adheres to two battery cell rows arranged adjacent to each other along a third direction.

[0010] In the embodiment of this application, the first connecting part is bonded to two adjacent battery cell rows arranged along a third direction, so that the first connecting part and the adjacent battery cells form a firm fixed connection, thereby improving the connection stability between the battery cell rows and reducing the risk of misalignment or detachment under vibration or impact conditions.

[0011] In some embodiments, the cover further includes a second connecting portion, which protrudes into the interior of the box relative to the main body portion. At least two second connecting portions are disposed opposite each other along a first direction, and the second connecting portions are disposed corresponding to the limiting beam along a second direction, and the second connecting portions are connected to the limiting beam.

[0012] In the embodiment of this application, the second connecting part is connected to the limiting beam by protruding into the box body, which utilizes the original space inside the box body and eliminates the need for additional connecting structures on the outside of the cover body. This reduces the risk of occupying additional external space and helps to improve the overall space utilization of the battery device, thereby increasing the overall energy density of the battery device. In addition, the fixed connection between the second connecting part and the limiting beam allows the expansion force borne by the limiting beam to be directly transmitted to the cover body through the second connecting part, so that the cover body can fully participate in bearing the overall expansion force, thereby suppressing the deformation of the limiting beam and improving the structural rigidity and torsional strength of the battery device.

[0013] In some embodiments, on a projection plane perpendicular to the second direction, the orthographic projection of the second connection portion is located within the range of the orthographic projection of the limiting beam.

[0014] In the embodiments of this application, the design allows the second connecting part and the limiting beam to be aligned in the connecting direction, enabling the connecting force between them to be uniformly transmitted along the bearing surface of the limiting beam. This reduces the risk of local stress concentration or connection failure caused by misalignment, thereby improving connection reliability and expansion force transmission efficiency. In addition, this design ensures that the second connecting part does not occupy additional space other than the limiting beam in the first direction, which helps maintain the compactness of the internal structure of the housing and reduces the risk of interference with other components (such as battery cells, cooling pipes, etc.). This further improves the space utilization of the battery device while achieving a reliable connection.

[0015] In some embodiments, the limiting beam and the second connecting portion are detachably connected by a fastener.

[0016] In the embodiment of this application, the limiting beam and the second connecting part are detachably connected by a fastener. The fastener can provide a stable and reliable locking force, so that a firm connection is formed between the limiting beam and the second connecting part, thereby effectively improving the connection stability of the two under conditions such as vibration and impact. In addition, when a component of the limiting beam or the cover is damaged during use, the fastener can be removed to replace the damaged component separately, thereby reducing maintenance costs and maintenance difficulty, and extending the overall service life of the battery device.

[0017] In some embodiments, the battery device further includes a seal disposed between the retainer and the second connection portion.

[0018] In the embodiment of this application, the seal can fill the gap between the fixing member and the second connection part. Under conditions such as vibration, impact or temperature change, even if the locking point is deformed or relatively displaced, the seal can still maintain an effective sealing effect, thereby reducing the risk of airtightness failure caused by deformation or cracking of the locking point and improving the sealing reliability inside the battery device.

[0019] In some embodiments, the battery device further includes a reinforcing member disposed in at least one of the following locations: the reinforcing member is disposed between the second connecting portion and the limiting beam; the reinforcing member is disposed inside the second connecting portion; the reinforcing member is disposed on the side of the second connecting portion opposite to the receiving space.

[0020] In the embodiments of this application, the reinforcing member can provide additional structural support at the connection position of the fastener, thereby enhancing the local strength of the second connection and the limiting beam, dispersing the stress generated by the fastener, thereby reducing the risk of cracking or plastic deformation of the second connection or the limiting beam around the mounting hole, and improving the durability and reliability of the fastener.

[0021] In some embodiments, the first connection portion is insulated from the battery cell assembly.

[0022] In the solution of this application embodiment, the first connecting part is insulated from the battery cell assembly, which can isolate the electrical conduction path between the first connecting part and the battery cell assembly, reduce the risk of short circuit caused by contact between the cover and the battery cell, and improve the electrical safety performance of the battery device.

[0023] In some embodiments, the material of the first connection portion is an insulating material.

[0024] In the solution of this application embodiment, the first connecting part itself has insulation properties, and there is no need to set an additional insulation layer or insulation component. It can directly contact the battery cell assembly. While realizing functions such as limiting, the first connecting part can block the electrical conduction path between the first connecting part and the battery cell, reducing the risk of short circuit.

[0025] In some embodiments, the first connection portion includes a metal portion and an insulating portion stacked together, the insulating portion being located on the side of the metal portion facing the battery cell assembly along a second direction, and the insulating portion being connected to the battery cell assembly.

[0026] In the embodiment of this application, the first connecting part is configured as a metal part and an insulating part stacked together, which can improve the overall structural strength and rigidity of the cover, effectively bear and transmit expansion force, and the insulating part insulates the battery cell assembly, achieving reliable electrical isolation at the contact interface, reducing the risk of short circuit caused by the metal part directly contacting the battery cell.

[0027] In a second aspect, an electrical device is provided, comprising: the battery device described in the first aspect or any embodiment of the first aspect.

[0028] In some embodiments, the electrical equipment is a vehicle, a ship, or a spacecraft. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of a vehicle according to one embodiment of this application.

[0030] Figure 2 This is a plan view of a battery device according to an embodiment of this application.

[0031] Figure 3 This is a cross-sectional schematic diagram of a battery device according to an embodiment of this application.

[0032] Figure 4 This is an enlarged schematic diagram of the structure of a battery device according to an embodiment of this application.

[0033] Figure 5 This is a cross-sectional schematic diagram of a battery device according to another embodiment of this application.

[0034] Figure 6 This is a cross-sectional schematic diagram of a battery device according to another embodiment of this application.

[0035] Figure 7 This is an enlarged schematic diagram of the structure of a battery device according to another embodiment of this application.

[0036] Figure 8 This is a cross-sectional schematic diagram of a battery device according to another embodiment of this application.

[0037] Figure 9 This is a cross-sectional schematic diagram of a battery device according to another embodiment of this application.

[0038] Figure 10 This is an enlarged schematic diagram of the structure of a battery device according to another embodiment of this application.

[0039] Figure 11 This is a cross-sectional schematic diagram of a battery device according to another embodiment of this application.

[0040] The accompanying drawings are not drawn to scale.

[0041] Explanation of reference numerals in the attached figures: Vehicle 1; Battery unit 10; Controller 200; Motor 300; Housing 11; Battery cell assembly 110; Limiting beam 112; Cover 13; Main body 133; First connecting part 134; Battery cell array 111; Battery cell 125; Second connecting part 126; Fixing member 127; Sealing member 128; First surface 120; Insulating member 121; Second surface 124; Reinforcing member 129; First insulating area 131; Second insulating area 132; Metal part 1340; Insulating part 1341. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0043] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application 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 description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0044] In this application, the reference to "embodiment" means that a specific 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 mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0045] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication 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.

[0046] 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, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0047] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0048] In this application, "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).

[0049] The battery apparatus mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells connected in series, parallel, or mixed connections via a busbar.

[0050] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0051] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form an independent module. As another example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0052] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cells housed within the housing.

[0053] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be housed in the housing by fixing the battery module in the housing.

[0054] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0055] 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.

[0056] 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.

[0057] In the development of battery technology, limiting beams are typically installed inside the battery pack to constrain individual battery cells. However, in actual use, battery cells generate expansion forces during charging and discharging, and vehicle vibrations can also cause displacement. To address these issues, a common approach is to add an independent clamping component within the battery pack to assist in limiting the cells and work with the limiting beam to resist expansion forces. However, this design not only occupies limited internal space, hindering the improvement of energy density, but also results in a dispersed force transmission path between the clamping component and the limiting beam, leading to poor resistance to expansion forces and difficulty in effectively suppressing beam deformation. Consequently, the overall structural stability and reliability of the battery pack cannot meet long-term usage requirements. Therefore, optimizing the stress state of the limiting beam and improving the structural stability and reliability of the battery pack without additional space requirements is a pressing technical problem in battery technology.

[0058] Therefore, the battery device and electrical equipment of this application embodiment can solve the above-mentioned problems. The battery device of this application embodiment includes a housing, a cover, and a battery cell assembly. The housing has a receiving space, and the housing includes at least two limiting beams, which are arranged opposite to each other along a first direction. The cover is connected to the housing along a second direction to close the receiving space. The cover includes a main body and a first connecting part, which protrudes into the housing relative to the main body. The first direction is perpendicular to the second direction. The battery cell assembly is housed in the receiving space. The battery cell assembly includes multiple battery cells, and the two ends of the battery cell assembly along the first direction abut against the two limiting beams respectively. The first connecting part extends along the first direction and connects the two limiting beams, and / or the first connecting part connects the multiple battery cells. In the embodiment of this application, the first connecting part protrudes into the housing relative to the main body and extends along the first direction to connect two limiting beams and / or connect multiple battery cells. Thus, the first connecting part acts as a clamping member to connect the battery cell assembly and / or the two limiting beams, restricting the movement of the battery cell assembly. This saves space in the second direction without adding independent clamping members, which helps to improve the energy density of the battery device. In addition, the first connecting part connects the two limiting beams into a whole. When the battery cell assembly generates expansion force due to charging and discharging, the expansion force is transmitted to the cover through the limiting beams and the first connecting part in sequence, so that the cover participates in bearing the load, thereby dispersing and suppressing the expansion deformation of the limiting beams. At the same time, it improves the overall modal and torsional strength of the housing and cover combination, thereby improving the structural stability and reliability of the battery device.

[0059] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use battery devices.

[0060] Electrical devices can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This application does not impose any special limitations on the above-mentioned electrical devices.

[0061] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device.

[0062] For example, such as Figure 1 The diagram shown is a structural schematic of a vehicle 1 according to one embodiment of this application. Vehicle 1 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 motor 300, a controller 200, and a battery device 10 can be installed inside vehicle 1. The controller 200 controls the battery device 10 to supply power to the motor 300. For example, the battery device 10 can be installed at the bottom, front, or rear of vehicle 1. The battery device 10 can be used to power vehicle 1. For example, the battery device 10 can serve as the operating power source for vehicle 1, for example, to meet the electrical system requirements of vehicle 1, such as for starting, navigation, and operation. In another embodiment of this application, the battery device 10 can not only serve as the operating power source for vehicle 1, but also as the driving power source for vehicle 1, replacing or partially replacing gasoline or natural gas to provide driving power for vehicle 1.

[0063] Figure 2 This is a plan view of a battery device 10 according to an embodiment of this application. Figure 3 This is a cross-sectional schematic diagram of a battery device 10 according to an embodiment of this application. Figure 4 This is an enlarged schematic diagram of the structure of a battery device 10 according to an embodiment of this application. Figure 5 This is a cross-sectional schematic diagram of a battery device 10 according to another embodiment of this application. Wherein, Figure 3 for Figure 2 The battery device 10 shown is a partial cross-sectional view along the direction A-A'. Figure 4 for Figure 3 An enlarged schematic diagram of the battery device 10 shown. Figure 5 for Figure 2 The battery device 10 shown is a partial cross-sectional view along the direction B-B'.

[0064] like Figures 2 to 5 As shown, the battery device 10 of this application embodiment includes a housing 11, a cover 13, and a battery cell assembly 110. The housing 11 has an accommodating space and includes at least two limiting beams 112, which are arranged opposite each other along a first direction X. The cover 13 covers and connects to the housing 11 along a second direction Z to close the accommodating space. The cover 13 includes a main body 133 and a first connecting part 134, which protrudes into the housing 11 relative to the main body 133. The first direction X is perpendicular to the second direction Z. The battery cell assembly 110 is housed in the accommodating space and includes a plurality of battery cells 125. The two ends of the battery cell assembly 110 along the first direction X abut against the two limiting beams 112, and the first connecting part 134 extends along the first direction X and connects the two limiting beams 112, and / or the first connecting part 134 connects the plurality of battery cells 125.

[0065] The battery device 10 of this application embodiment may include at least one battery cell 125 for providing voltage and capacity. For example, the battery device 10 may include a battery cell assembly 110, wherein the battery cell assembly 110 may include at least one battery cell 125, and a plurality of battery cells 125 may be arranged regularly along a first direction X and / or a third direction Y. Exemplarily, when the battery device 10 includes a plurality of battery cells 125, the plurality of battery cells 125 may be connected in series, in parallel, or in a mixed connection.

[0066] The battery cell 125 in this embodiment of the application has a polyhedral structure. As an example, the battery cell 125 can be a cylindrical battery cell 125, a prismatic battery cell 125, a pouch battery cell 125, or a battery cell 125 of other shapes. The prismatic battery cell 125 includes a prismatic battery cell 125, a blade-shaped battery cell 125, and a multi-prismatic battery, such as a hexagonal prismatic battery. This application does not have any particular limitations.

[0067] For ease of explanation, such as Figures 2 to 5As shown, this application embodiment takes a cuboid battery device 10 as an example, and defines three directions based on the cuboid battery device 10: the first direction X is the length direction of the battery device 10, or the first direction X can also be the extension direction of the first connecting part 134; the second direction Z can be the height direction of the battery device 10, or the second direction Z can also be the direction in which the cover 13 covers the box 11; the third direction Y can be the width direction of the battery device 10; wherein, the first direction X, the second direction Z and the third direction Y are perpendicular to each other, and the dimension of the battery device 10 in its length direction is greater than the dimension in its width direction.

[0068] The limiting beam 112 can be the frame of the housing 11. The two side walls of the housing 11 along the first direction X can be used as the limiting beam 112. The two ends of the battery cell assembly 110 along the first direction X directly abut against the opposite inner side walls of the housing 11. This structure eliminates the need for additional beams inside the housing 11, simplifying the structure and reducing the overall weight of the battery device 10.

[0069] The limiting beam 112 can also be a beam structure independently set in the receiving space. That is, a raised beam is individually fixed or integrally formed on the bottom plate or side wall of the housing 11. These beams are located inside the receiving space and are used to limit the battery cell assembly 110 and resist the expansion force generated by the battery cell 125.

[0070] The number of limiting beams 112 can be set according to actual needs. In some embodiments, two limiting beams 112 are provided, located at both ends of the battery cell assembly 110 along the first direction X, with the ends of the battery cell assembly 110 abutting against the two limiting beams 112 respectively. In other embodiments, there can be multiple limiting beams 112, for example, multiple limiting beams 112 are spaced apart along the first direction X. For example, the battery cell assembly 110 may include multiple battery cells 125 arranged along the first direction X, and the multiple limiting beams 112 can divide the battery cells 125 into several groups. Specifically, in the accommodating space extending along the first direction X, in addition to the limiting beams 112 at both ends, one or more limiting beams 112 can be added in the middle position. The additional limiting beams 112 in the middle divide the entire battery cell assembly 110 into multiple subgroups: the battery cells 125 between two adjacent limiting beams 112 constitute a subgroup, and the ends of the battery cells 125 in each subgroup abut against the corresponding two limiting beams 112 along the first direction X respectively. Taking the setting of three limiting beams 112 as an example, along the first direction X, there are a first limiting beam, a second limiting beam, and a third limiting beam. The battery cells 125 between the first and second limiting beams form a first subgroup, and the battery cells 125 between the second and third limiting beams form a second subgroup. The expansion force generated by the battery cells 125 in each subgroup during charging and discharging is borne by their respective limiting beams 112, thereby dispersing the expansion force that was originally concentrated on the two limiting beams 112 to multiple intermediate limiting beams 112, reducing the stress burden on a single limiting beam 112, and improving the ability of the battery device 10 to resist expansion deformation. At the same time, the multiple spaced limiting beams 112 can also provide more positioning points for the battery cell assembly 110, further restricting the movement of the battery cells 125 along the first direction X, improving assembly accuracy and structural stability.

[0071] The main body 133 can be a plate-like structure used to cover and seal the box 11. The first connecting part 134 protrudes into the box 11 relative to the main body 133, that is, the first connecting part 134 is a protruding structure of the cover 13 facing the receiving space. This protruding structure can be integrally formed by stamping, stretching or other processes of the sheet metal of the cover 13, or it can be an independent component fixed to the main body 133 by welding or other connection methods.

[0072] The first connecting portion 134 may extend along the first direction X and has at least one of the following connection methods: Connection method one: the first connecting part 134 connects two limiting beams 112.

[0073] The first connecting portion 134 extends along the first direction X, and its two ends are respectively connected to two limiting beams 112. The first connecting portion 134 acts as a crossbeam connecting the two limiting beams 112. When the battery cell assembly 110 generates an expansion force, this expansion force pushes the two limiting beams 112 to tend to open outward. After the first connecting portion 134 connects the two limiting beams 112, it can transfer the force on the limiting beams 112 to the cover 13, so that the cover 13 can also participate in resisting the expansion force, thereby suppressing the deformation of the limiting beams 112. At the same time, the first connecting portion 134 is also located above the battery cell assembly 110 (along the second direction Z and away from the receiving space), which can restrict the movement of the battery cell assembly 110 in the second direction Z.

[0074] The first connecting portion 134 can be connected to any wall of the battery cell 125. For example, the first connecting portion 134 can be connected to the wall of the battery cell 125 with electrode terminals. Specifically, the first connecting portion 134 can abut between two electrode terminals of the battery cell 125 to reduce the risk of interference to the electrode terminals and ensure the reliability of the electrical connection. Alternatively, the first connecting portion 134 can also be connected to the shoulder area of ​​the wall. The shoulder area refers to the peripheral area of ​​the wall of the battery cell 125 with electrode terminals, excluding the area where the electrode terminals are located and the area where the pressure relief mechanism is located. This shoulder area is usually the area near the edge. By abutting the first connecting portion 134 against the shoulder area, it can achieve the limiting function without obstructing the electrode terminals or the pressure relief mechanism, thus taking into account both the limiting function and the normal charging and discharging and safe pressure relief requirements of the battery cell 125.

[0075] The connection between the first connecting part 134 and the two limiting beams 112 can be a fixed connection, such as welding or bonding; or the connection between the first connecting part 134 and the two limiting beams 112 can be a detachable connection, such as being connected by fasteners 127 such as bolts or screws.

[0076] Optionally, when multiple limiting beams 112 are provided, the first connecting portion 134 can be connected to multiple limiting beams 112 simultaneously. For example, when multiple limiting beams 112 are spaced apart along the first direction X, such as two end limiting beams 112 and one or more intermediate limiting beams 112, the first connecting portion 134 can extend along the first direction X and connect to each limiting beam 112 respectively. In this way, the expansion force borne by each limiting beam 112 can be transmitted to the cover 13 through the first connecting portion 134, further dispersing the force, suppressing the deformation of the intermediate limiting beams 112, and further improving the overall structural rigidity and torsional strength of the battery device 10.

[0077] Connection method two: the first connecting part 134 connects multiple battery cells 125.

[0078] In one example, when the battery cell assembly 110 includes a plurality of battery cells 125 arranged along a first direction X, the first connecting portion 134 can extend along the first direction X and connect to the plurality of battery cells 125 simultaneously. Specifically, the first connecting portion 134 can abut against the same wall of the plurality of battery cells 125 (e.g., the top wall with electrode terminals or the bottom wall away from the top wall), or these battery cells 125 can be fixedly connected by adhesive. In this way, the first connecting portion 134 can directly constrain the displacement of each battery cell 125 in the second direction Z, acting as a pressure strip. At the same time, when the battery cell 125 generates expansion force, the expansion force can be transmitted to the cover 13 through the first connecting portion 134, so that the cover 13 participates in bearing the expansion force, reducing the risk of the expansion force acting too concentratedly on the limiting beam 112.

[0079] In another example, the battery cell assembly 110 includes a plurality of battery cell rows 111 arranged along a third direction Y, each battery cell row 111 including battery cells 125 arranged along a first direction X. In this case, a first connection portion 134 may be disposed between adjacent battery cell rows 111, which will be described in detail later.

[0080] The connection between the first connecting part 134 and the battery cell 125 can be achieved by abutment, bonding, or indirect connection through other intermediate structures. The abutment method between the first connecting part 134 and the battery cell 125 can achieve effective displacement constraint, which facilitates assembly and maintenance; the bonding method between the first connecting part 134 and the battery cell 125 can form a more solid fixed connection, further improving the stability of the connection and the structural integrity between the two.

[0081] Optionally, the first connecting part 134 and the battery cell 125 can also be indirectly connected through other intermediate structures (such as elastic gaskets, insulating sheets, etc.), which can provide additional functions such as buffering or insulation while realizing the limiting function.

[0082] In the third connection method, the first connecting part 134 simultaneously connects two limiting beams 112 and multiple battery cells 125.

[0083] The first connecting part 134 is connected to both the two limiting beams 112 and the multiple battery cells 125. The first connecting part 134 is connected to the limiting beams 112 to form a force transmission path that resists expansion force. The first connecting part 134 is connected to the battery cells 125 to directly constrain the displacement of the battery cells 125 and collect the expansion force. The two functions work together to further improve the structural stability and torsional strength of the battery device 10.

[0084] In the embodiment of this application, the first connecting part 134 protrudes into the housing 11 relative to the main body 133 and extends along the first direction X to connect two limiting beams 112 and / or connect multiple battery cells 125. Thus, the first connecting part 134 acts as a clamping member to connect the battery cell assembly 110 and restrict its movement, thereby saving space in the second direction Z without adding independent clamping members, which helps to improve the energy density of the battery device 10. In addition, the first connecting part 134 connects the two limiting beams 112 into a whole. When the battery cell assembly 110 generates expansion force due to charging and discharging, the expansion force is transmitted to the cover 13 in sequence through the limiting beams 112 and the first connecting part 134, so that the cover 13 participates in bearing the load, thereby dispersing and suppressing the expansion deformation of the limiting beams 112, and improving the overall modal and torsional strength of the housing 11 and the cover 13 after combination, thereby improving the structural stability and reliability of the battery device 10.

[0085] Figure 6 This is a cross-sectional schematic diagram of a battery device 10 according to another embodiment of this application. Figure 7 This is an enlarged schematic diagram of the structure of the battery device 10 according to another embodiment of this application. Figure 6 for Figure 2 The battery device 10 shown is a partial cross-sectional view along the direction A-A'. Figure 7 for Figure 6 An enlarged schematic diagram of the battery device 10 shown.

[0086] Optionally, based on some embodiments of this application, reference may be made to... Figures 2 to 7 As shown, the first connecting part 134 is insulated and connected to the battery cell assembly 110.

[0087] In some embodiments, the first connection portion 134 may include a first insulating region 131 facing the battery cell assembly 110, the first insulating region 131 being insulated from the battery cell assembly 110.

[0088] Specifically, the first insulating region 131 is located on the surface of the first connection portion 134 facing the receiving space.

[0089] In some embodiments, the first insulating region 131 can directly abut against the battery cell assembly 110. In this case, the first insulating region 131 serves both as insulation and as a mechanical contact surface, uniformly transmitting the clamping force of the first connecting portion 134 on the battery cell assembly 110 to the surface of the battery cell 125, thereby constraining the displacement of the battery cell assembly 110 in the second direction Z.

[0090] In some embodiments, the first insulating region 131 can also be bonded to the battery cell assembly 110. That is, an insulating adhesive is coated or applied to the surface of the first insulating region 131, so that the first connecting portion 134 is fixedly connected to the battery cell assembly 110. The bonding method not only achieves insulation, but also further restricts the relative displacement of the battery cell assembly 110 in various directions, improves the connection stability, and the adhesive layer has a certain elastic buffering capacity, which can reduce the impact caused by vibration or expansion.

[0091] In the embodiment of this application, the first insulating region 131 can isolate the electrical conduction path between the first connecting part 134 and the battery cell assembly 110, reduce the risk of short circuit caused by contact between the cover 13 and the battery cell 125, and improve the electrical safety performance of the battery device 10.

[0092] Figure 8 This is a cross-sectional schematic diagram of a battery device 10 according to another embodiment of this application. Figure 8 for Figure 2 The battery device 10 shown is a cross-sectional schematic diagram along the direction A-A'.

[0093] According to some embodiments of this application, optionally, such as Figure 8 As shown, the first connecting portion 134 also includes a second insulating region 132, and the first insulating region 131 intersects with the second insulating region 132.

[0094] Specifically, the first connecting portion 134 protrudes into the housing 11 relative to the main body 133, meaning the first connecting portion 134 has three surfaces facing the receiving space: the surface directly facing (i.e., directly opposite) the battery cell assembly 110 is called the first surface 120, and the sides located on either side of the first surface 120 are called the second surface 124. A first insulating region 131 is disposed on the first surface 120 to isolate the electrical contact between the first connecting portion 134 and the battery cell assembly 110. A second insulating region 132 is disposed on the second surface 124, and the first insulating region 131 and the second insulating region 132 intersect, thereby achieving multi-faceted insulating coverage of the first connecting portion 134.

[0095] For example, when the battery cell assembly 110 includes a plurality of battery cell rows 111 arranged along a third direction Y, and the first connecting portion 134 is disposed along the third direction Y between two adjacent battery cell rows 111, the two sides of the first connecting portion 134 along the third direction Y (i.e., the two second surfaces 124) face the electrode terminals in the two battery cell rows 111 respectively. Since the electrode terminals are usually located in the edge region of the top wall of the battery cell 125, and the electrode terminals of adjacent battery cell rows 111 are close to each other, if the second surface 124 of the first connecting portion 134 is made of a conductive material, there is a risk of simultaneous contact with two electrode terminals of different polarities or short circuit between adjacent battery cell rows 111. Therefore, a second insulating region 132 can be provided on the second surface 124 to isolate the electrical contact between the first connecting portion 134 and the electrode terminals.

[0096] In the embodiments of this application, the first insulating region 131 and the second insulating region 132 can further isolate the electrical conduction path between the first connecting part 134 and the battery cell assembly 110, reduce the risk of short circuit caused by contact between the cover 13 and the battery cell 125, and further improve the electrical safety performance of the battery device 10.

[0097] According to some embodiments of this application, optionally, such as Figures 3 to 5 As shown, the material of the first connecting part 134 is an insulating material.

[0098] It should be noted that the aforementioned first insulating region 131 and second insulating region 132 are regions defined from a functional perspective, namely, regions on the first connection portion 134 used to achieve insulation isolation. When the first connection portion 134 is entirely made of insulating material, all surfaces of the first connection portion 134, or at least the surface facing the battery cell assembly 110, naturally possess insulating properties.

[0099] Specifically, insulating materials refer to materials that are non-conductive or have extremely high resistivity. For example, the material of the first connecting part 134 can be plastic (such as polycarbonate PC, acrylonitrile-butadiene-styrene copolymer ABS, polypropylene PP, polybutylene terephthalate PBT, etc.), rubber, ceramics, glass fiber reinforced composite materials, or metals with insulating surface treatment.

[0100] The first connecting portion 134, formed of insulating material, naturally forms a first insulating region 131 on its first surface 120 facing the battery cell assembly 110, and a second insulating region 132 on its second side surface 124. The first insulating region 131 and the second insulating region 132 intersect and connect at the edges or corners of the first connecting portion 134. In other words, when the first connecting portion 134 is integrally formed of insulating material, there is no need to set an additional independent insulating layer or apply an insulating coating; the entire inner surface of the first connecting portion 134 can be regarded as an insulating region.

[0101] In the embodiment of this application, the first connecting part 134 itself has insulation properties, so there is no need to set an additional insulation layer or insulation component. It can directly contact the battery cell assembly 110. While realizing functions such as limiting, the first connecting part 134 can effectively block the electrical conduction path between the first connecting part 134 and the battery cell 125, reducing the risk of short circuit.

[0102] Figure 9 This is a cross-sectional schematic diagram of a battery device 10 according to another embodiment of this application. Figure 10 This is an enlarged schematic diagram of the structure of the battery device 10 according to another embodiment of this application. Figure 9 for Figure 2 The battery device 10 shown is a partial cross-sectional view along the direction B-B'. Figure 10 for Figure 9 An enlarged schematic diagram of the battery device 10 shown.

[0103] According to some embodiments of this application, optionally, such as Figures 6 to 10 As shown, the first connecting portion 134 includes a metal portion 1340 and an insulating portion 1341 stacked together. The insulating portion 1341 is located on the side of the metal portion 1340 facing the battery cell assembly 110 along the second direction Z. The insulating portion 1341 is connected to the battery cell assembly 110.

[0104] In this case, on a plane perpendicular to the second direction Z, the orthographic projection of the metal part 1340 can be within the range of the orthographic projection of the insulating part 1341, so as to improve the overall rigidity of the first connecting part 134 and better insulate the metal part 1340 from the battery cell assembly 110.

[0105] Optionally, the material of the first connection portion 134 may include a conductive material, and an insulating member 121 is provided on the side of the first connection portion 134 facing the battery cell assembly 110, the insulating member 121 being formed in the first insulating region 131.

[0106] It should be understood that the insulating portion 1341 and the insulating member 121 in the above embodiments can be the same. For example, the first connecting portion 134 can include two parts, namely the insulating portion 1341 and the metal portion 1340. The first connecting portion 134 can also be regarded as only one part, namely the metal portion 1340. In this case, the insulating portion 1341 is the insulating member 121.

[0107] Specifically, conductive material refers to material with good electrical conductivity. The material of the first connecting part 134 can be a metallic material, such as aluminum alloy, steel plate, copper alloy, etc., or the material of the first connecting part 134 can be a conductive composite material.

[0108] The first connecting part 134 can give the cover 13 a high mechanical strength and rigidity, which is beneficial to withstand and transmit the expansion force generated by the battery cell assembly 110. At the same time, it is easy to connect or integrally form with the main body 133 of the cover 13 through welding, riveting and other processes.

[0109] Since the material of the first connection portion 134 is conductive and lacks insulation properties, direct contact with the battery cell assembly 110 could pose a short circuit risk. Therefore, an insulating member 121 is provided on the side of the first connection portion 134 facing the battery cell assembly 110. This insulating member 121 is formed in the aforementioned first insulating region 131. The function of the insulating member 121 is to isolate the electrical contact between the first connection portion 134 and the battery cell assembly 110, preventing current from forming a path between different battery cells 125 or components of different polarities through the first connection portion 134.

[0110] As an example, the insulating element 121 may be an insulating coating applied or sprayed onto the surface of the first connection portion 134, such as an epoxy resin coating, a polyurethane coating, a ceramic coating, etc.

[0111] As another example, the insulating element 121 may be an independent insulating element 121 fixed to the surface of the first connecting portion 134 by injection molding, molding or attaching, such as a plastic sheet, rubber sheet, insulating tape, etc.

[0112] As another example, the insulating element 121 may be an insulating oxide layer formed on the surface of the first connecting part 134 by surface treatment processes such as anodizing and micro-arc oxidation (for example, when the first connecting part 134 is an aluminum alloy, an aluminum oxide insulating layer may be formed on its surface by anodizing).

[0113] Optionally, the insulating member 121 can be formed in the first insulating region 131 and the second insulating region 132. That is, the insulating member 121 not only covers the first surface 120 of the first connecting portion 134, but also covers the second surface 124 of the first connecting portion 134. When the first connecting portion 134 is disposed between adjacent battery cell rows 111, the second surface 124 faces the electrode terminal of the battery cell 125. The insulating member 121 covering the second surface 124 simultaneously can effectively prevent short circuits caused by contact between the first connecting portion 134 and the electrode terminal. By forming the insulating member 121 in both the first insulating region 131 and the second insulating region 132, comprehensive insulation protection can be achieved for all possible contact surfaces between the first connecting portion 134 and the battery cell assembly 110. Furthermore, the insulating members 121 in the two regions can be integrally formed, thereby eliminating insulation blind spots at the junction and further improving electrical safety and reliability.

[0114] It should be understood that when the above-mentioned insulating member 121 is formed in the first insulating region 131 and the second insulating region 132, the insulating member 121 is "U" shaped to cover the first connecting portion 134. After the insulating member 121 is connected to the battery cell assembly 110, the insulating member 121 and the first connecting portion 134 together limit the battery cell assembly 110.

[0115] It should also be understood that the above description of the relationship between the insulating member 121 and the first connecting portion 134 is consistent with the description of the relationship between the insulating portion 1341 and the metal portion 1340, and will not be repeated here.

[0116] In the embodiment of this application, the first connecting portion 134 includes a metal portion 1340 and an insulating portion 1341 stacked together. The insulating portion 1341 is located on the side of the metal portion 1340 facing the battery cell assembly 110 along the second direction Z. This can improve the overall structural strength and rigidity of the cover 13 and effectively bear and transmit expansion force. By providing an insulating member 121 between the first connecting portion 134 and the battery cell assembly 110, reliable electrical isolation is achieved at the contact interface, reducing the risk of short circuit caused by direct contact of conductive materials with the battery cell 125.

[0117] According to some embodiments of this application, optionally, such as Figures 2 to 10 As shown, the battery cell assembly 110 includes multiple battery cell rows 111. Each battery cell row 111 includes multiple battery cells 125 arranged along the first direction X. Adjacent battery cell rows 111 are arranged along the third direction Y. The orthographic projection of the first connecting portion 134 along the second direction Z overlaps with the two adjacent battery cell rows 111 along the third direction Y. The first direction X, the second direction Z, and the third direction Y are perpendicular to each other.

[0118] The orthographic projection of the first connecting part 134 along the second direction Z overlaps with the two adjacent battery cell rows 111 along the third direction Y. In other words, the first connecting part 134 is disposed between the two adjacent battery cell rows 111 along the third direction Y.

[0119] Specifically, the first connecting part 134 simultaneously spans and connects to the shoulder area of ​​two adjacent battery cell rows 111.

[0120] In the embodiment of this application, by setting the first connecting part 134, the space occupied by the clamping member in the height direction is eliminated, thereby improving the space utilization rate inside the battery device 10 and thus improving the energy density of the battery device 10. At the same time, the first connecting part 134 directly abuts between the two battery cell rows 111, which can simultaneously restrict the relative movement of adjacent battery cell rows 111 in any direction, playing a limiting role. This can suppress the displacement of the battery cell 125 under charging and discharging expansion or vibration conditions, and improve structural stability. In addition, when the battery cell 125 generates expansion force, the expansion force can be directly transmitted to the cover 13 through the first connecting part 134, so that the cover 13 participates in bearing the expansion force, thereby dispersing the expansion load borne by the limiting beam 112, reducing the deformation risk of the limiting beam 112, and further improving the overall structural rigidity and torsional strength of the battery device 10.

[0121] According to some embodiments of this application, optionally, such as Figures 2 to 10 As shown, the first connecting part 134 is bonded to two adjacent rows of battery cells 111 arranged along the third direction Y.

[0122] Specifically, the first connecting portion 134 adheres to the first walls of at least two battery cells 125 arranged adjacent to each other along the third direction Y. The first wall can be any wall of the battery cell 125, for example, the first wall is the wall of the battery cell 125 with electrode terminals, or the first wall is the wall opposite to the wall with electrode terminals.

[0123] For example, the first wall is the wall where the electrode terminals are located (i.e., the top wall of the battery cell 125), and the first connecting portion 134 can bond two battery cells 125 that are arranged adjacent to each other along the third direction Y. Specifically, these two battery cells 125 belong to two adjacent battery cell rows 111 and are adjacent to each other along the third direction Y. The first connecting portion 134 simultaneously covers and bonds to the top wall surface of these two battery cells 125, and the bonding area can be located in the shoulder area of ​​the top wall.

[0124] For example, the first wall is the wall opposite to the wall where the electrode terminals are located (i.e., the bottom wall of the battery cell 125), and the first connecting portion 134 can bond at least two battery cells 125 arranged adjacent to each other along the third direction Y. Specifically, the first connecting portion 134 can be disposed on part or the entire bottom wall of the battery cell assembly 110 and bonded to part or the entire bottom wall of the battery cell assembly 110. When the first connecting portion 134 is bonded to part or the entire bottom wall, a larger area of ​​fixed connection can be achieved, further improving the connection stability between the battery cell assembly 110 and the cover 13.

[0125] The first connecting part 134 can adhere to one battery cell 125 in the battery cell row 111, or, when each battery cell row 111 includes a plurality of battery cells 125 arranged along the first direction X, the first connecting part 134 can adhere to one or more battery cells 125 in the battery cell row 111.

[0126] Alternatively, besides adhesive bonding, other connection methods or combinations can be used between the first connecting portion 134 and the battery cell 125. For example, the first connecting portion 134 and the battery cell 125 can be connected by an abutment method, where the first connecting portion 134 directly contacts the first wall of the battery cell 125 without using adhesive. The clamping force is provided by the locking force between the cover 13 and the housing 11. This abutment method facilitates assembly and disassembly, and is beneficial for later maintenance and replacement. Another example is the combination of adhesive bonding and abutment bonding between the first connecting portion 134 and the battery cell 125. In some areas, adhesive bonding is used for fixation, while in other areas, only abutment bonding is used, thus ensuring connection stability while allowing for certain assembly tolerances. Furthermore, the first connecting portion 134 and the battery cell 125 can also be indirectly connected by setting elastic gaskets or buffer layers, providing buffer protection while transmitting pressure and expansion forces, reducing local stress concentration on the surface of the battery cell 125.

[0127] In the embodiment of this application, the first connecting part 134 is bonded to two adjacent battery cell rows 111 arranged along the third direction Y, so that the first connecting part 134 and the adjacent battery cell 125 form a firm fixed connection, thereby improving the connection stability between the battery cell rows 111 and reducing the risk of misalignment or detachment under vibration or impact conditions.

[0128] According to some embodiments of this application, optionally, such as Figures 2 to 10 As shown, the cover 13 also includes a second connecting part 126. The second connecting part 126 protrudes into the interior of the box 11 compared to the main body 133. At least two second connecting parts 126 are arranged opposite each other along the first direction X. The second connecting parts 126 are arranged corresponding to the limiting beam 112 along the second direction Z, and the second connecting parts 126 are connected to the limiting beam 112.

[0129] The limiting beam 112 is housed within the receiving space and is positioned opposite each other along the first direction X. In actual design, the height of the limiting beam 112 can be determined by the structural strength and assembly requirements of the housing 11. The height of the main body 133 of the cover 13 is determined by the height of the battery cell 125 and the limiting requirements of the first connecting part 134. Therefore, there will be a certain height difference between the top of the limiting beam 112 and the main body 133 of the cover 13, i.e., there is a gap between them. To address this, a second connecting part 126 is provided. By protruding into the housing 11, it fills the gap between the top of the limiting beam 112 and the main body 133 of the cover 13 without changing the overall height of the main body 133 of the cover 13, allowing the second connecting part 126 to directly connect with the limiting beam 112.

[0130] The top of the limiting beam 112 refers to the end of the limiting beam 112 along the second direction Z and facing the cover 13.

[0131] The orthographic projection shape of the second connecting part 126 on a plane perpendicular to the second direction Z can be circular, elliptical, rectangular, waist-shaped, racetrack-shaped, or polygonal, etc. The selection of the projection shape can be designed according to the top surface shape of the limiting beam 112, the connection method, and the stress requirements. For example, when bolted connection is used, the second connecting part 126 can be set as a boss structure with a circular projection, which facilitates the processing of bolt holes and the bearing of preload; when welding or bonding is used, the second connecting part 126 can be set as a structure with a long strip or waist-shaped projection to increase the connection area and improve the connection strength.

[0132] The number of second connecting parts 126 can correspond one-to-one with the number of limiting beams 112. For example, if two limiting beams 112 are provided at both ends along the first direction X, then two second connecting parts 126 are provided accordingly, each connecting part 126 connecting to one of the two limiting beams 112. This ensures that each limiting beam 112 is connected to the cover 13 through an independent second connecting part 126, resulting in balanced force distribution.

[0133] The number of second connecting parts 126 can also be less than the number of limiting beams 112. For example, if multiple limiting beams 112 are provided along the first direction X (such as limiting beams 112 at both ends plus a middle limiting beam 112), only the limiting beams 112 at both ends along the first direction X can be fixedly connected to the second connecting parts 126. The middle limiting beam 112 does not need to be directly connected to the cover 13, but relies on the connection of the limiting beams 112 at both ends and the rigidity of the cover 13 itself to bear and transmit the expansion force. This design reduces the number of second connecting parts 126, simplifies the processing technology of the cover 13, and reduces manufacturing costs while meeting the requirements of force transmission and structural strength.

[0134] The second connecting part 126 connects to the limiting beam 112. The connection method can be a fixed connection, such as welding (including laser welding, resistance welding, arc welding, etc.), bonding (such as structural adhesive bonding), or riveting. For example, the connection method can also be a detachable connection, such as connection via bolts, screws, or other fasteners 127. A detachable connection facilitates the assembly and disassembly of the cover 13 and the housing 11. When it is necessary to repair or replace the battery cell assembly 110, the cover 13 can be easily removed, reducing maintenance costs. For example, the connection method can also be a snap-fit ​​connection, interference fit connection, or other quick-connection method to improve assembly efficiency.

[0135] In the embodiment of this application, the second connecting part 126 is connected to the limiting beam 112 by protruding into the box 11, which utilizes the original space inside the box 11 and eliminates the need for additional connecting structures on the outside of the cover 13. This reduces the risk of occupying additional external space and helps to improve the overall space utilization of the battery device 10, thereby increasing the overall energy density of the battery device 10. In addition, the fixed connection between the second connecting part 126 and the limiting beam 112 allows the expansion force borne by the limiting beam 112 to be directly transmitted to the cover 13 through the second connecting part 126, so that the cover 13 can fully participate in bearing the overall expansion force, thereby effectively suppressing the deformation of the limiting beam 112 and improving the structural rigidity and torsional strength of the battery device 10.

[0136] According to some embodiments of this application, optionally, such as Figures 2 to 10 As shown, on the projection plane perpendicular to the second direction Z, the orthographic projection of the second connecting part 126 is located within the range of the orthographic projection of the limiting beam 112.

[0137] Specifically, when the battery device 10 is projected along the second direction Z, the orthographic projection outline of the second connecting portion 126 on a projection plane perpendicular to the second direction Z completely falls within the orthographic projection outline of the limiting beam 112. That is, the dimension of the second connecting portion 126 in the horizontal direction is less than or equal to the dimension of the limiting beam 112 in that direction, and the position of the second connecting portion 126 is aligned with the position of the limiting beam 112, so that the second connecting portion 126 does not protrude outward from the boundary of the limiting beam 112.

[0138] In the embodiments of this application, the design allows the second connecting part 126 to be aligned with the limiting beam 112 in the connection direction, enabling the connection force between them to be uniformly transmitted along the bearing surface of the limiting beam 112. This reduces the risk of local stress concentration or connection failure caused by misalignment, thereby improving connection reliability and expansion force transmission efficiency. In addition, this design ensures that the second connecting part 126 does not occupy additional space other than the limiting beam 112 in the first direction X, which helps maintain the compactness of the internal structure of the housing 11 and reduces the risk of interference with other components (such as battery cells 125, cooling pipes, etc.). This further improves the space utilization of the battery device 10 while achieving a reliable connection.

[0139] Optionally, based on some embodiments of this application, reference may be made to... Figure 5 , Figure 9 as well as Figure 10 The limiting beam 112 and the second connecting part 126 are detachably connected by the fastener 127.

[0140] The fastener 127 can be a bolt, with a corresponding threaded hole on the second connecting part 126 and a through hole or threaded hole on the limiting beam 112. The bolt passes through the limiting beam 112 and engages with the threaded hole of the second connecting part 126 to lock it in place. Alternatively, the fastener 127 can be a screw, directly connected to the second connecting part 126 or the limiting beam 112 via mechanical threads. Alternatively, the fastener 127 can be a rivet (such as a pull rivet or a press rivet), securing the two together via riveting, which offers advantages such as good vibration resistance and eliminates the need for an additional nut. Alternatively, the fastener 127 can also be a snap-fit, quick-lock pin, or other quick-connect structure for rapid assembly and disassembly, facilitating maintenance.

[0141] Optionally, gaskets may be provided between the fastener 127 and the second connecting portion 126 and / or between the fastener 127 and the limiting beam 112. For example, the gasket may be a flat gasket, used to increase the contact area between the head of the fastener 127 and the surface of the connected component, dispersing compressive stress and preventing indentations or deformation of the surface of the second connecting portion 126 or the limiting beam 112 due to excessive local pressure. For example, the gasket may be a spring washer or a wave-shaped elastic gasket, used to provide a preload retention function to prevent the fastener 127 from loosening under vibration conditions. For example, the gasket may be a sealing gasket (such as a rubber gasket, silicone gasket, or a metal gasket coated with sealant), used to fill the gap between the fastener 127 and the connecting hole, providing a waterproof, dustproof, or airtight seal to prevent external moisture or impurities from entering the receiving space through the mounting hole of the fastener 127. For example, the gasket can also be an insulating gasket used to isolate the electrical contact between the fastener 127 and the second connection portion 126 or the limiting beam 112, thereby reducing the risk of short circuit caused by the conductivity of the fastener 127.

[0142] In the embodiment of this application, the limiting beam 112 and the second connecting part 126 are detachably connected by the fastener 127. The fastener 127 can provide a stable and reliable locking force, so that the limiting beam 112 and the second connecting part 126 form a firm connection relationship, thereby effectively improving the connection stability of the two under vibration, impact and other working conditions. In addition, when a component of the limiting beam 112 or the cover 13 is damaged during use, the fastener 127 can be removed to replace the damaged component separately, thereby reducing maintenance costs and maintenance difficulty, and extending the overall service life of the battery device 10.

[0143] Optionally, based on some embodiments of this application, reference may be made to... Figure 5 , Figure 9 as well as Figure 10 The battery device 10 also includes a seal 128 disposed between the fixing member 127 and the second connecting portion 126.

[0144] Specifically, in the scheme where the limiting beam 112 and the second connecting part 126 are detachably connected by a fastener 127 (such as a bolt or screw), a sealing element 128 is provided at the contact interface between the fastener 127 and the second connecting part 126.

[0145] The sealing element 128 can be an annular sealing ring, such as an O-ring or a rectangular sealing ring, which is fitted onto the rod portion of the fixing element 127 and pressed between the fixing element 127 and the surface of the second connecting portion 126. For example, the sealing element 128 can be a sealant (such as silicone, epoxy, anaerobic adhesive, etc.) coated or pre-applied around the mounting hole of the fixing element 127 or the second connecting portion 126, which is squeezed and filled into the gap at the contact interface during the tightening of the fixing element 127. For example, the sealing element 128 can also be an adhesive layer integrally formed with the fixing element 127 or a combined sealing gasket pre-installed on the fixing element 127.

[0146] In the embodiment of this application, the sealing member 128 can fill the gap between the fixing member 127 and the second connecting part 126. Under conditions such as vibration, impact or temperature change, even if the locking point is deformed or relatively displaced, the sealing member 128 can still maintain an effective sealing effect, thereby reducing the risk of airtightness failure caused by deformation or cracking of the locking point and improving the sealing reliability inside the battery device 10.

[0147] Figure 11 This is a cross-sectional schematic diagram of a battery device 10 according to another embodiment of this application. Wherein, Figure 11 for Figure 2 The battery device 10 shown is a partial cross-sectional view along the direction B-B'.

[0148] According to some embodiments of this application, optionally, such as Figure 5 and Figure 11 As shown, the battery device 10 also includes a reinforcing member 129, which is disposed in at least one of the following locations: the reinforcing member 129 is disposed between the second connecting portion 126 and the limiting beam 112; the reinforcing member 129 is disposed inside the second connecting portion 126; the reinforcing member 129 is disposed on the side of the second connecting portion 126 opposite to the receiving space.

[0149] The reinforcing member 129 can be made of a metallic material, such as steel, aluminum alloy, copper alloy, or other metals with high mechanical strength. Using a metallic reinforcing member 129 can effectively improve the local structural strength around the second connection 126 or the locking point, preventing deformation or damage during tightening of the fastener 127 or during service.

[0150] Alternatively, the reinforcing member 129 can also be made of other high-strength materials, such as fiber-reinforced composite materials or engineering plastics, depending on the actual stress requirements, weight requirements, and cost factors.

[0151] In some embodiments, such as Figure 11 As shown, the reinforcing member 129 can be disposed between the second connecting portion 126 and the limiting beam 112. The reinforcing member 129, located at this position, can serve as an intermediate gasket or transition structure, directly bearing and distributing the clamping force applied by the fixing member 127 and the stress generated during the transmission of expansion force. Because the reinforcing member 129 has high strength and rigidity, it can effectively increase the stress-bearing area between the second connecting portion 126 and the limiting beam 112, preventing cracking or plastic deformation of the second connecting portion 126 due to excessive local compressive stress. Simultaneously, the reinforcing member 129 can also fill any small gaps or flatness errors that may exist between the second connecting portion 126 and the limiting beam 112, ensuring uniform contact and stable stress distribution between them.

[0152] In some embodiments, such as Figure 5As shown, the reinforcing member 129 is disposed inside the second connecting portion 126. The reinforcing member 129 is positioned at this location, meaning it is an embedded part encased within the body material of the second connecting portion 126. For example, the material of the second connecting portion 126 is an insulating material. The metal reinforcing member 129 can be embedded within the second connecting portion 126 to improve the overall structural strength, tensile strength, and torsional strength of the second connecting portion 126. Specifically, during injection molding of the second connecting portion 126, a pre-processed metal reinforcing member 129 can be placed into the mold, allowing the insulating material to wrap around the outside of the reinforcing member 129, forming an integrated composite structure. The reinforcing member 129 can withstand the tensile force generated when the fixing member 127 is tightened, preventing the second connecting portion 126 from cracking or disengaging due to insufficient thread load-bearing capacity. Furthermore, the insulating material, as the outer layer, can maintain the insulation performance between the second connecting portion 126 and surrounding components (such as the battery cell 125, the limiting beam 112, etc.), reducing the risk of short circuits caused by the metal reinforcing member 129.

[0153] In some embodiments, the reinforcing member 129 is disposed on the side of the second connecting portion 126 opposite to the receiving space. The reinforcing member 129 is disposed at this location, that is, the reinforcing member 129 is located on the back side of the second connecting portion 126 (the side facing the outside of the cover 13, the side opposite to the receiving space). This arrangement can locally reinforce the second connecting portion 126 without occupying the internal space of the receiving space.

[0154] Specifically, the reinforcing member 129 can be a metal plate, metal gasket, or reinforcing rib structure fixed to the back of the second connecting part 126 by welding, bonding, or riveting. When the fixing member 127 is installed from the receiving space side (or from the outside), the back of the second connecting part 126 is subjected to tensile stress. The reinforcing member 129 can effectively resist this tensile force and prevent the second connecting part 126 from bulging, cracking, or deforming due to insufficient wall thickness or insufficient material strength.

[0155] In addition, the three types of reinforcing members 129 mentioned above can be used in pairs or in threes, and this application does not impose any restrictions on their placement.

[0156] In the embodiment of this application, the reinforcing member 129 can provide additional structural support at the connection position of the fixing member 127, thereby enhancing the local strength of the second connecting part 126 and the limiting beam 112, dispersing the stress generated by the fixing member 127, thereby reducing the risk of cracking or plastic deformation of the second connecting part 126 or the limiting beam 112 around the mounting hole, and improving the durability and reliability of the fixing member 127.

[0157] According to some embodiments of this application, this application also provides an electrical device including the battery device 10 described in any of the above embodiments, and the battery device 10 is used to provide electrical energy to the electrical device.

[0158] The electrical equipment can be any of the aforementioned devices or systems that utilize the battery device 10.

[0159] According to some embodiments of this application, see Figures 2 to 11 A battery device 10 is provided, comprising a housing 11, a cover 13, and a battery cell assembly 110. The housing 11 has an accommodating space and includes at least two limiting beams 112, which are arranged opposite each other along a first direction X. The cover 13 is connected to the housing 11 along a second direction Z to close the accommodating space. The cover 13 includes a main body 133 and a first connecting part 134, which protrudes into the housing 11 relative to the main body 133. The first direction X is perpendicular to the second direction Z. The battery cell assembly 110 is housed in the accommodating space and includes a plurality of battery cells 125. The two ends of the battery cell assembly 110 along the first direction X abut against the two limiting beams 112, wherein the first connecting part 134 extends along the first direction X and connects the two limiting beams 112, and / or the first connecting part 134 connects the plurality of battery cells 125.

[0160] The battery cell assembly 110 includes multiple battery cell rows 111. Each battery cell row 111 includes multiple battery cells 125 arranged along a first direction X. Two adjacent battery cell rows 111 are arranged along a third direction Y. The orthographic projection of the first connecting portion 134 along the second direction Z overlaps with the two adjacent battery cell rows 111 along the third direction Y. The first direction X, the second direction Z, and the third direction Y are perpendicular to each other.

[0161] The first connecting part 134 adheres to two adjacent rows of battery cells 111 arranged along the third direction Y.

[0162] The cover 13 also includes a second connecting part 126, which protrudes into the interior of the box 11 relative to the main body 133. At least two second connecting parts 126 are arranged opposite each other along the first direction X. The second connecting parts 126 are arranged corresponding to the limiting beam 112 along the second direction Z, and the second connecting parts 126 are connected to the limiting beam 112.

[0163] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not 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 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 they should all be covered within the scope of the claims and specification 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. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that, include: The box (11) has a receiving space inside, and the box (11) includes at least two limiting beams (112), which are arranged opposite to each other along a first direction; A cover (13) is connected to the box (11) along a second direction to close the accommodating space. The cover (13) includes a main body (133), a first connecting part (134), and a second connecting part (126). The first connecting part (134) protrudes into the box (11) relative to the main body (133), and the second connecting part (126) protrudes into the box (11) relative to the main body (133). At least two second connecting parts (126) are arranged opposite each other along the first direction, and the first direction is perpendicular to the second direction. A battery cell assembly (110) is housed within the receiving space. The battery cell assembly (110) includes a plurality of battery cells (125), and the two ends of the battery cell assembly (110) along the first direction respectively abut against the two limiting beams (112). The first connecting part (134) extends along the first direction and connects to two limiting beams (112), and the first connecting part (134) connects to a plurality of battery cells (125). The second connecting part (126) is arranged in the second direction corresponding to the limiting beams (112), and the second connecting part (126) connects to the limiting beams (112).

2. The battery device according to claim 1, characterized in that, The battery cell assembly (110) includes multiple battery cell rows (111), each battery cell row (111) includes multiple battery cells (125) arranged along the first direction, two adjacent battery cell rows (111) are arranged along a third direction, the orthographic projection of the first connecting portion (134) along the second direction overlaps with the two adjacent battery cell rows (111) along the third direction, and the first direction, the second direction and the third direction are perpendicular to each other.

3. The battery device according to claim 2, characterized in that, The first connecting part (134) adheres to two adjacent rows of battery cells (111) arranged along the third direction.

4. The battery device according to claim 1, characterized in that, On the projection plane perpendicular to the second direction, the orthographic projection of the second connecting part (126) is located within the range of the orthographic projection of the limiting beam (112).

5. The battery device according to claim 1, characterized in that, The limiting beam (112) and the second connecting part (126) are detachably connected by a fastener (127).

6. The battery device according to claim 5, characterized in that, The battery device also includes: A sealing element (128) is disposed between the fixing element (127) and the second connecting part (126).

7. The battery device according to claim 1, characterized in that, The battery device also includes: The reinforcing member (129) is disposed in at least one of the following locations: The reinforcing member (129) is disposed between the second connecting part (126) and the limiting beam (112); The reinforcing member (129) is disposed inside the second connecting portion (126); The reinforcing member (129) is disposed on the side of the second connecting portion (126) opposite to the receiving space.

8. The battery device according to any one of claims 1 to 7, characterized in that, The first connecting part (134) is insulated from the battery cell assembly (110).

9. The battery device according to claim 8, characterized in that, The material of the first connecting part (134) is an insulating material.

10. The battery device according to claim 8, characterized in that, The first connecting portion (134) includes a metal portion (1340) and an insulating portion (1341) stacked together. The insulating portion (1341) is located on the side of the metal portion (1340) facing the battery cell assembly (110) along the second direction. The insulating portion (1341) is connected to the battery cell assembly (110).

11. An electrical appliance, characterized in that, include: The battery device according to any one of claims 1 to 10.

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