Battery device and electric device

Abstract

The application provides a battery device and a power utilization device, which comprises a plurality of battery monomers arranged along a first direction; a first limiting component is arranged at one end of the plurality of battery monomers along the first direction; a second limiting component is arranged at one side of the plurality of battery monomers along a second direction and extends along the first direction, a first mounting hole and a second mounting hole are arranged on the first end of the second limiting component along the first direction, the second mounting hole is closer to the short side of the first end than the first mounting hole, and the second direction is perpendicular to the first direction; the second limiting component is fixedly connected with the first limiting component through the first mounting hole and the second mounting hole, and the second mounting hole is provided with a first groove recessed in a direction away from the first mounting hole along the first direction, so that the reliability of the battery device can be improved.

Description

Technical Field

[0001] This application relates to the field of batteries, and more specifically, to a battery device and an electrical device. Background Technology

[0002] In battery devices, individual battery cells may expand during charge and discharge cycles. Current battery devices often use limiting components to constrain the expansion of individual battery cells. However, as the expansion force becomes stronger, the stress borne by the limiting components also becomes greater. Excessive stress may cause the limiting components to crack, thereby affecting the reliability of the battery device.

[0003] Therefore, improving the reliability of battery devices has become an urgent problem to be solved. Utility Model Content

[0004] This application provides a battery device and an electrical device that can reduce the risk of limit components breaking and failing due to fatigue, thereby improving the reliability of the battery device.

[0005] In a first aspect, a battery device is provided, comprising a plurality of battery cells disposed along a first direction; a first limiting member disposed at one end of the plurality of battery cells along the first direction; a second limiting member disposed on one side of the plurality of battery cells along a second direction and extending along the first direction, wherein a first end of the second limiting member along the first direction is provided with a first mounting hole and a second mounting hole disposed along the first direction, the second mounting hole being closer to the short side of the first end than the first mounting hole, and the second direction being perpendicular to the first direction; wherein the second limiting member is fixedly connected to the first limiting member through the first mounting hole and the second mounting hole, and the second mounting hole is provided with a first groove recessed in a direction opposite to the first mounting hole in the first direction.

[0006] In the technical solution provided in this application embodiment, by adopting a double mounting hole layout at the end of the second limiting component and setting a first groove in the second mounting hole near the short side, the force-bearing area of ​​the connection area can be increased, and a stress buffer and release area can be established at the edge of the mounting hole to improve the stress distribution state. This can improve the fatigue tensile resistance of the second limiting component, thereby reducing the risk of the second limiting component breaking due to fatigue, and thus improving the reliability of the battery device.

[0007] In some embodiments, the first groove, which is away from the first mounting hole along a first direction, gradually decreases in size along a third direction; wherein the third direction is perpendicular to the first direction and the second direction.

[0008] In the technical solution provided by the embodiments of this application, by making the size of the first groove gradually decrease along the third direction, the structural transition during the load transmission process can be realized, the stress concentration phenomenon caused by the sudden change of local cross section can be alleviated, thereby improving the overall durability of the second limiting component structure.

[0009] In some embodiments, the battery device further includes: a first reinforcing member, which is stacked on top of a first end of a second limiting member, the first reinforcing member being disposed between the second limiting member and the first limiting member.

[0010] In the technical solution provided in this application embodiment, by stacking a first reinforcing member between the second limiting member and the first limiting member, the local structural rigidity and deformation resistance of the connection part are enhanced, and the load-bearing capacity of the fixed connection between the second limiting member and the first limiting member is improved, thereby improving the reliability of the battery device.

[0011] In some embodiments, the first reinforcing member is provided with a first through hole and a second through hole, the first through hole being configured corresponding to the first mounting hole and the second through hole being configured corresponding to the second mounting hole.

[0012] In the technical solution provided in this application embodiment, the fastener achieves overall through-fixation of the multi-layer stacked structure through the corresponding cooperation of the first through hole and the second through hole with the first mounting hole and the second mounting hole, thereby improving the assembly accuracy and overall stability of the bolt connection. At the same time, the strength of the first end of the second limiting component is locally strengthened, which can reduce the possibility of the second limiting component being damaged, thereby improving the reliability of the battery device.

[0013] In some embodiments, the shape of the second through hole matches the shape of the second mounting hole.

[0014] In the technical solution provided in this application embodiment, by matching the shape of the second through hole with the shape of the second mounting hole, the possibility of stress resistance caused by local geometric mismatch can be reduced, so that the stress relief function of the first groove can be properly performed.

[0015] In some embodiments, the battery device further includes: a third limiting member disposed at the other end of a plurality of battery cells along a first direction; the second limiting member is provided with a third mounting hole and a fourth mounting hole disposed along the first direction at its second end, the fourth mounting hole being closer to the short side of the second end than the third mounting hole; wherein the second limiting member is fixedly connected to the third limiting member through the third mounting hole and the fourth mounting hole.

[0016] In the technical solution provided in this application embodiment, by also providing double mounting holes at the second end of the second limiting component and fixing it with the third limiting component, a symmetrical layout of the battery device's two-end constraint structure along the first direction is achieved, thereby improving the overall mechanical constraint balance and reliability.

[0017] In some embodiments, the fourth mounting hole is provided with a second groove recessed in a direction opposite to the third mounting hole in a first direction.

[0018] In the technical solution provided in this application embodiment, by setting a second groove in the fourth mounting hole, both ends of the second limiting component have stress relief function, so that the force on both sides of the second limiting component is uniform, which can improve the stress concentration situation at both ends of the second limiting component, thereby improving the service life of the second limiting component and thus improving the reliability of the battery device.

[0019] In some embodiments, the battery device further includes: a second reinforcing member, which is stacked on top of the second end of the second limiting member, and the second reinforcing member is disposed between the second limiting member and the third limiting member.

[0020] In the technical solution provided in this application embodiment, by adding a second reinforcing member at the second end, the structural strength of the connection area at the second end can be improved, thereby improving the consistency of the connection performance at both ends of the second limiting member, making the force at both ends of the second limiting member uniform, improving the load-bearing capacity of the second limiting member, and thus improving the reliability of the battery device.

[0021] In some embodiments, the second reinforcing member is provided with a third through hole and a fourth through hole, the third through hole being provided in correspondence with the third mounting hole, and the fourth through hole being provided in correspondence with the fourth mounting hole.

[0022] In the technical solution provided by the embodiments of this application, the corresponding arrangement of the third through hole and the fourth through hole can realize the positioning of the second end fastener and improve the reliability of the connection of the second end multi-layer structure.

[0023] In some embodiments, the shape of the fourth through hole matches the shape of the fourth mounting hole.

[0024] In the technical solution provided in this application embodiment, by matching the shape of the fourth through hole with the fourth mounting hole, the stress relief function of the second groove at the second end is not hindered, and the load on the connection interface at the second end is evenly distributed, thereby improving the service life of the second limiting component.

[0025] In some embodiments, the ratio d1 / d2 of the maximum dimension d1 of the first groove along the third direction and the maximum dimension d2 of the second mounting hole along the third direction satisfies 0.3≤d1 / d2≤1.

[0026] In the technical solution provided in this application embodiment, by limiting the maximum size ratio of the first groove and the second mounting hole in the third direction to within the range of 0.3 to 1, the tensile strength of the material around the second mounting hole and the stress buffering capacity of the first groove are taken into account, thereby achieving a reasonable configuration of structural bearing capacity and fatigue resistance.

[0027] In some embodiments, the ratio d3 of the distance d3 between the first groove and the short side of the first end to the maximum dimension d2 of the second mounting hole along the third direction satisfies 0.2≤d3 / d2≤2.

[0028] In the technical solution provided in this application embodiment, by limiting the ratio of the distance from the first groove to the short side to the size of the second mounting hole to between 0.2 and 2, the material allowance at the end edge is reasonably optimized, reducing the risk of tearing failure at the end, while improving the compactness and space utilization of the second limiting component.

[0029] In some embodiments, the distance d3 between the first groove and the short side of the first end satisfies: 5mm≤d3≤10mm.

[0030] In the technical solution provided in this application embodiment, by limiting the distance between the first groove and the short side of the first end to within the range of 5 mm to 10 mm, the battery device can be compactly arranged, while improving the fatigue tensile strength of the end edge and mitigating the risk of end breakage due to collision or expansion.

[0031] In a second aspect, an electrical device is provided, comprising: a battery device as described in any of the first aspects, wherein the battery device is used to provide electrical energy.

[0032] In some embodiments, the electrical device is a vehicle, a ship, or a spacecraft. Attached Figure Description

[0033] Figure 1 A schematic diagram of a vehicle according to one embodiment of this application is shown; Figure 2 A schematic diagram of the structure of a battery device according to an embodiment of this application is shown; Figure 3 A perspective view of a battery device provided in a certain embodiment of this application is shown; Figure 4 A schematic diagram of a second limiting component in a battery device according to a certain embodiment of this application is shown; Figure 5 A perspective schematic diagram of another possible form of the battery device provided in one embodiment of this application is shown; Figure 6 This application shows Figure 5 Enlarged view of part A in the image; Figure 7 An inverted schematic diagram of the second limiting component in a battery device according to a certain embodiment of this application is shown; Figure 8 This illustration shows a schematic diagram of the second limiting component in a battery device according to a certain embodiment of the present application, in its upright position. Figure 9 This application shows Figure 8 Enlarged view of part B in the image.

[0034] The accompanying drawings are not drawn to scale.

[0035] Figure label: 1-Vehicle; 10-Battery unit; 20-Battery cell; 30-Controller; 40-Motor; 11-Box; 111-First box section; 112-Second box section; 210-First limiting component; 220-Second limiting component; 221-First end; 222-Second end; 230-Third limiting component; 240-First reinforcing component; 250-Second reinforcing component; 310-First mounting hole; 320-Second mounting hole; 321-First groove; 330-Third mounting hole; 340-Fourth mounting hole; 341-Second groove; 410-First through hole; 420-Second through hole; 430-Third through hole; 440-Fourth through hole. Detailed Implementation

[0036] 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, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0037] 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 specification of this application is for the purpose of describing particular embodiments only and is not intended to limit this application; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and foregoing drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or foregoing drawings of this application are used to distinguish different objects, rather than to describe a specific order or hierarchy.

[0038] 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 in the specification does not necessarily imply that all embodiments are the same, nor are they independent or alternative embodiments mutually exclusive with other embodiments. 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.

[0039] In the description of this application, 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.

[0040] In this application, the term "and / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0041] 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 illustrative and should not constitute any limitation on this application.

[0042] 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).

[0043] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0044] Unless otherwise specified, all technical features and optional technical features of this application may be combined to form new technical solutions.

[0045] In this embodiment of the application, the battery cell can be a secondary battery, which can be a battery cell that can be used again after the battery cell has been discharged by recharging to activate the active material.

[0046] 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.

[0047] The battery device 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, which are connected in series, parallel, or mixed connections via a busbar.

[0048] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0049] 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.

[0050] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cell assemblies housed within the housing.

[0051] 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.

[0052] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0053] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0054] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use individual battery cells, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships, and spacecraft. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft.

[0055] Currently, judging from market trends, the application of power batteries is becoming increasingly widespread. Power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in special equipment and aerospace. With the continuous expansion of power battery applications, market demand is also constantly increasing.

[0056] In battery devices, individual battery cells may expand during charge and discharge cycles. Current battery devices often use limiting components to constrain the expansion of individual battery cells. However, as the expansion force becomes stronger, the stress borne by the limiting components also becomes greater. Excessive stress may cause the limiting components to crack, thereby affecting the reliability of the battery device.

[0057] Therefore, improving the reliability of battery devices has become an urgent problem to be solved.

[0058] This application provides a battery device including multiple battery cells arranged along a first direction; a first limiting member is disposed at one end of the multiple battery cells along the first direction; a second limiting member is disposed on one side of the multiple battery cells along a second direction and extends along the first direction, the first end of the second limiting member along the first direction is provided with a first mounting hole and a second mounting hole arranged along the first direction, the second mounting hole being closer to the short side of the first end than the first mounting hole, the second direction being perpendicular to the first direction; wherein, the second limiting member is fixedly connected to the first limiting member through the first mounting hole and the second mounting hole, the second mounting hole being provided with a first groove recessed in a direction opposite to the first mounting hole in the first direction.

[0059] In the technical solution provided by the embodiments of this application, by adopting a double mounting hole layout at the end of the second limiting component and providing a first groove in the second mounting hole near the short side, the force-bearing area of ​​the connection region can be increased, and a stress buffer and release area can be established at the edge of the mounting hole, improving the stress distribution state. This can improve the fatigue tensile resistance of the second limiting component, thereby reducing the risk of the second limiting component failing due to fatigue, and thus improving the reliability of the battery device. 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 1This illustration shows a structural diagram 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 40, a controller 30, and a battery device 10 can be installed inside vehicle 1. The controller 30 controls the battery device 10 to supply power to the motor 40. 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, it can serve as the operating power source for vehicle 1's electrical system, such as meeting the power requirements 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, replacing or partially replacing gasoline or natural gas to provide driving power to vehicle 1.

[0063] For example, Figure 2 A partial structural schematic diagram of the battery device 10 according to an embodiment of this application is shown. Figure 2 As shown, the battery device 10 of this application embodiment may include a plurality of battery cells 20 to meet different power usage requirements. The shape of the battery cell 20 in this application embodiment can be set according to actual application. For example, the battery cell 20 can be as follows: Figure 2 The prism shape shown, or it could be different. Figure 2 Other shapes are shown in the embodiments of this application, but the embodiments are not limited thereto.

[0064] It should be understood that, such as Figure 2 As shown, the battery device 10 of this embodiment may further include a housing 11, which can be used to accommodate multiple battery cells 20. The housing 11 of this embodiment has a hollow interior, and the multiple battery cells 20 are accommodated within the housing 11. The housing 11 may include two parts, referred to herein as a first housing portion 111 and a second housing portion 112, which are fastened together. The shapes of the first housing portion 111 and the second housing portion 112 can be determined according to the shape of the components housed inside, for example, according to the shape of the combination of the multiple battery cells 20 housed inside. At least one of the first housing portion 111 and the second housing portion 112 has an opening. For example, as... Figure 2 As shown, the first housing portion 111 and the second housing portion 112 can both be hollow cuboids with one open side each. The openings of the first housing portion 111 and the second housing portion 112 are opposite to each other, and the first housing portion 111 and the second housing portion 112 are interlocked to form a housing 11 with a closed chamber, which can be used to accommodate multiple battery cells 20. The multiple battery cells 20 are connected in parallel, series, or mixed and placed inside the housing 11 formed by the interlocking of the first housing portion 111 and the second housing portion 112.

[0065] For example, unlike Figure 2 As shown, one of the first housing portion 111 and the second housing portion 112 may be a hollow cuboid with an opening, while the other is plate-shaped to cover the opening. Taking the second housing portion 112 as a hollow cuboid with an opening and the first housing portion 111 as a plate-shaped example, then the first housing portion 111 covers the opening of the second housing portion 112 to form a housing 11 with a closed chamber, which can be used to accommodate multiple battery cells 20.

[0066] The following is combined Figure 3 and Figure 4 This application describes a battery device 10 provided in one embodiment.

[0067] Figure 3 A perspective view of a battery device 10 according to a certain embodiment of this application is shown; Figure 4 A schematic diagram of the second limiting member 220 in a battery device 10 provided in a certain embodiment of this application is shown.

[0068] This application provides a battery device 10, including a plurality of battery cells 20, which are arranged along a first direction; a first limiting member 210 is disposed at one end of the plurality of battery cells 20 along the first direction; a second limiting member 220 is disposed on one side of the plurality of battery cells 20 along a second direction and extends along the first direction, the first end 221 of the second limiting member 220 along the first direction is provided with a first mounting hole 310 and a second mounting hole 320 arranged along the first direction, the second mounting hole 320 being closer to the short side of the first end 221 than the first mounting hole 310, and the second direction being perpendicular to the first direction; wherein, the second limiting member 220 is fixedly connected to the first limiting member 210 through the first mounting hole 310 and the second mounting hole 320, and the second mounting hole 320 is provided with a first groove 321 recessed in the direction opposite to the first mounting hole 310 in the first direction.

[0069] The first direction can be understood as the direction in which multiple battery cells are arranged in a 20-cell configuration.

[0070] The first limiting component 210 can be understood as a structural component located at one end of the battery cell 20, such as an end plate, expansion beam, or crossbeam, used to limit the expansion and displacement of the battery cell 20 in the first direction.

[0071] The second limiting component 220 can be understood as a pull strip or steel pressure strip extending along the side of the battery cell 20, used to cooperate with the first limiting component 210 to constrain the battery cell 20 as a whole.

[0072] The first mounting hole 310 and the second mounting hole 320 can be understood as fastening through holes formed at the first end 221 of the second limiting member 220. The first groove 321 can be a stress relief structure formed in the wall of the second mounting hole 320 and recessed towards the short side of the first end 221.

[0073] During charging and discharging, the battery cell 20 may expand. In the early stages of use of the battery device 10, restraining the expansion of the battery cell 20 can reduce the possibility of electrode folding, thereby improving the lifespan of the battery cell 20. However, as the battery cell 20 is used, the expansion force may increase.

[0074] When the battery cell 20 expands during long-term charge and discharge cycles, the expansion force is transmitted along the first direction to the connection between the first limiting component 210 and the second limiting component 220, causing local stress concentration at the edge of the mounting hole. Long-term alternating load can easily cause fatigue and cracks in the second limiting component 220.

[0075] This embodiment expands the connection contact area between the second limiting component 220 and the first limiting component 210 by using a single-sided double-hole layout consisting of a first mounting hole 310 and a second mounting hole 320 at the first end 221 of the second limiting component 220, thus dispersing the tensile load borne by a single hole. The connection strength between the first mounting hole 310 and the first limiting component 210 is high, providing better support strength for the battery cell 20 in the early stage of expansion. At the same time, a first groove 321 is provided at the second mounting hole 320, which is closer to the short side of the first end 221 and is recessed in a direction away from the first mounting hole 310. The first groove 321 provides a controllable stress release area for the second limiting component 220 when subjected to tensile stress. When the expansion force of the battery cell 20 is too large, the first groove 321 can share more stress, absorb and disperse the local stress concentration at the bolt fastening part, and delay the accumulation process of material fatigue damage.

[0076] In the technical solution provided in this application embodiment, by adopting a double mounting hole layout at the end of the second limiting component 220 and setting a first groove 321 in the second mounting hole 320 near the short side, the force-bearing area of ​​the connection area can be increased, and a stress buffer and release area can be established at the edge of the mounting hole to improve the stress distribution state. This can improve the fatigue tensile resistance of the second limiting component 220, thereby reducing the risk of the second limiting component 220 breaking due to fatigue, and thus improving the reliability of the battery device 10.

[0077] In some embodiments, the size of the first groove 321 gradually decreases along a third direction away from the first mounting hole 310; wherein the third direction is perpendicular to the first direction and the second direction.

[0078] The third direction can be perpendicular to the first and second directions. The first groove 321 gradually shrinks in size along the third direction away from the first mounting hole 310, so that the first groove 321 forms a gradually narrowing shape. When the second limiting member 220 is subjected to tensile load in the first direction, this narrowing structure can alleviate the abrupt change in cross-sectional stress, so that the stress can be smoothly transitioned during the transmission along the first direction.

[0079] In the technical solution provided in this application embodiment, by making the size of the first groove 321 gradually decrease along the third direction, the structural transition during the load transmission process can be realized, the stress concentration phenomenon caused by the sudden change of local cross section can be alleviated, thereby improving the overall durability of the structure of the second limiting component 220.

[0080] The following is combined Figures 5 to 9 This application describes another possible form of the battery device 10 provided in one embodiment.

[0081] Figure 5 A perspective view of another possible form of the battery device 10 provided in one embodiment of this application is shown; Figure 6 This application shows Figure 5 Enlarged view of part A in the image; Figure 7 An inverted schematic diagram of the second limiting component 220 in a battery device 10 provided in a certain embodiment of this application is shown; Figure 8 This paper shows a schematic diagram of the second limiting component 220 in a battery device 10 according to a certain embodiment of the present application, in an upright position. Figure 9 This application shows Figure 8 Enlarged view of part B in the image.

[0082] In some embodiments, the battery device 10 further includes a first reinforcing member 240, which is stacked on top of the first end 221 of the second limiting member 220, and the first reinforcing member 240 is disposed between the second limiting member 220 and the first limiting member 210.

[0083] The first reinforcing member 240 may be a metal pad or reinforcing plate disposed between the second limiting member 220 and the first limiting member 210, used to increase the local thickness and rigidity of the connection area.

[0084] A first reinforcing member 240 is sandwiched between the mounting contact surfaces of the second limiting member 220 and the first limiting member 210, which increases the total thickness of the connection joint and improves the uniformity of the fastening preload distribution. When the battery cell 20 expands and generates a large tensile force, the first reinforcing member 240 can provide support for the end of the second limiting member 220, reducing the possibility of warping or shear deformation of the end of the second limiting member 220 due to excessive local stress.

[0085] In the technical solution provided in this application embodiment, by stacking a first reinforcing member 240 between the second limiting member 220 and the first limiting member 210, the local structural rigidity and deformation resistance of the connection part are enhanced, and the load-bearing capacity of the fixed connection between the second limiting member 220 and the first limiting member 210 is improved, thereby improving the reliability of the battery device 10.

[0086] In some embodiments, the first reinforcing member 240 is provided with a first through hole 410 and a second through hole 420, the first through hole 410 being correspondingly provided with the first mounting hole 310, and the second through hole 420 being correspondingly provided with the second mounting hole 320.

[0087] The first through hole 410 and the second through hole 420 can be through holes formed on the first reinforcing member 240, for coaxial alignment with the first mounting hole 310 and the second mounting hole 320 on the second limiting member 220.

[0088] By opening first through holes 410 and second through holes 420 on the first reinforcing member 240 that correspond one-to-one with the first mounting holes 310 and second mounting holes 320 on the second limiting member 220, the fastener can pass through the second limiting member 220 and the first reinforcing member 240 at the same time and be fixed on the first limiting member 210, so that the fastening force lines of the double bolts are aligned and the load is shared collaboratively.

[0089] In the technical solution provided in this application embodiment, the fastener achieves overall through-fixation of the multi-layer stacked structure by correspondingly cooperating with the first through hole 410 and the second through hole 420 with the first mounting hole 310 and the second mounting hole 320, thereby improving the assembly accuracy and overall stability of the bolt connection. At the same time, the strength of the first end 221 of the second limiting component 220 is locally strengthened, which can reduce the possibility of the second limiting component 220 being damaged, thereby improving the reliability of the battery device 10.

[0090] In some embodiments, the shape of the second through hole 420 matches the shape of the second mounting hole 320.

[0091] The shape of the second through hole 420 can match the shape of the second mounting hole 320 by having the hole wall contour, groove recess shape and size of the second through hole 420 consistent with or complementary to the hole wall contour of the second mounting hole 320 and the shape of the first groove 321.

[0092] By ensuring that the second through hole 420 on the first reinforcing member 240 and the second mounting hole 320 on the second limiting member 220, including the first groove 321, are matched in outline, the possibility of the hole wall of the first reinforcing member 240 obstructing or interfering with the first groove 321 of the second mounting hole 320 can be reduced, allowing the first groove 321 to play a stress buffering role, while ensuring that the shear stress on the contact surface of the two is uniformly transmitted when they are under load.

[0093] In the technical solution provided in this application embodiment, by matching the shape of the second through hole 420 with the shape of the second mounting hole 320, the possibility of stress resistance caused by local geometric mismatch can be reduced, so that the stress relief function of the first groove 321 can be properly performed.

[0094] In some embodiments, the battery device 10 further includes: a third limiting member 230 disposed at the other end of the plurality of battery cells 20 along a first direction; a second limiting member 220 having a third mounting hole 330 and a fourth mounting hole 340 disposed along the first direction at its second end 222, the fourth mounting hole 340 being closer to the short side of the second end 222 than the third mounting hole 330; wherein the second limiting member 220 is fixedly connected to the third limiting member 230 through the third mounting hole 330 and the fourth mounting hole 340.

[0095] The third limiting component 230 may be a limiting structure located at the other end of the battery cell 20 arrangement, such as an end plate or expansion beam on the opposite side.

[0096] The second end 222, the third mounting hole 330 and the fourth mounting hole 340 can be the other end of the second limiting member 220 opposite to the first end 221 along the first direction and the mounting through hole thereon.

[0097] The second limiting component 220 serves as a tension member spanning multiple battery cells 20, with its two ends connected to the first limiting component 210 and the third limiting component 230, respectively. A double-hole connection structure consisting of a third mounting hole 330 and a fourth mounting hole 340 is also provided at the second end 222, forming a double-bolt fixing form for the second limiting component 220 distributed along the first direction. This ensures that the constraint tension on both sides of the battery cell 20 remains symmetrical and stable, reducing the possibility of excessive stress concentration due to unilateral load.

[0098] In the technical solution provided in this application embodiment, by also providing double mounting holes at the second end 222 of the second limiting component 220 and fixing it with the third limiting component 230, a symmetrical layout of the constraint structure at both ends of the battery device 10 along the first direction is achieved, which improves the balance and reliability of the overall mechanical constraint.

[0099] In some embodiments, the fourth mounting hole 340 is provided with a second groove 341 recessed in a direction opposite to the third mounting hole 330 in a first direction.

[0100] The second groove 341 may be a stress relief groove opened on the short side of the fourth mounting hole 340 near the second end 222.

[0101] A second groove 341 is formed on the fourth mounting hole 340 at the second end 222, recessed in the direction opposite to the third mounting hole 330, so that both ends of the second limiting member 220 have stress relief and buffering structures. When the battery cell expands, the stress concentration on both sides is simultaneously relieved, reducing the possibility of one end of the second limiting member 220 having excess strength while the other end fails due to fatigue.

[0102] In the technical solution provided in this application embodiment, by providing a second groove 341 in the fourth mounting hole 340, both ends of the second limiting component 220 are equipped with stress relief function, so that the force on both sides of the second limiting component 220 is uniform, which can improve the stress concentration situation of the second limiting component 220 at both ends, thereby improving the service life of the second limiting component 220 and thus improving the reliability of the battery device 10.

[0103] In some embodiments, the battery device 10 further includes a second reinforcing member 250, which is stacked on top of the second end 222 of the second limiting member 220, and the second reinforcing member 250 is disposed between the second limiting member 220 and the third limiting member 230.

[0104] The second reinforcing member 250 may be a reinforcing pad block disposed between the second end 222 of the second limiting member 220 and the third limiting member 230.

[0105] The second reinforcing member 250 is stacked at the second end 222, which can simultaneously improve the local stiffness and bending bearing capacity of the connection area of ​​the second end 222, so that the strength and stiffness of the connection structure of the second limiting member 220 at the first end 221 and the second end 222 are matched.

[0106] In the technical solution provided in this application embodiment, by adding a second reinforcing member 250 to the second end 222, the structural strength of the connection area of ​​the second end 222 can be improved, thereby improving the consistency of the connection performance of the two ends of the second limiting member 220, making the two ends of the second limiting member 220 uniformly stressed, improving the load-bearing capacity of the second limiting member 220, thereby improving the reliability of the battery device 10.

[0107] In some embodiments, the second reinforcing member 250 is provided with a third through hole 430 and a fourth through hole 440, the third through hole 430 being correspondingly provided with the third mounting hole 330, and the fourth through hole 440 being correspondingly provided with the fourth mounting hole 340.

[0108] The third through hole 430 and the fourth through hole 440 can be through holes opened on the second reinforcing member 250 that correspond to the third mounting hole 330 and the fourth mounting hole 340.

[0109] By opening corresponding third through holes 430 and fourth through holes 440 on the second reinforcing member 250, an alignment channel is provided for the double bolt fastener of the second end 222, so that the multi-layer structure of the second end 222 can be fastened through.

[0110] In the technical solution provided by the embodiments of this application, the positioning of the fastener at the second end 222 and the reliability of the connection of the multi-layer structure at the second end 222 can be realized by the corresponding arrangement of the third through hole 430 and the fourth through hole 440.

[0111] In some embodiments, the shape of the fourth through hole 440 matches the shape of the fourth mounting hole 340.

[0112] Shape matching can be achieved by ensuring that the contour of the fourth through hole 440 is consistent with the contour of the fourth mounting hole 340, which includes the shape of the second groove 341.

[0113] The shape of the fourth through hole 440 matches that of the fourth mounting hole 340, so that the second reinforcing member 250 can avoid the stress release area of ​​the second groove 341, so that the second groove 341 of the second end 222 can freely release stress and maintain the uniformity of force on the second end 222.

[0114] In the technical solution provided in this application embodiment, by matching the shape of the fourth through hole 440 with the fourth mounting hole 340, the stress relief function of the second groove 341 of the second end 222 is not hindered, and the load on the connection interface of the second end 222 is evenly distributed, thereby improving the service life of the second limiting component 220.

[0115] In some embodiments, the ratio d1 / d2 of the maximum dimension d1 of the first groove 321 along the third direction and the maximum dimension d2 of the second mounting hole 320 along the third direction satisfies 0.3≤d1 / d2≤1.

[0116] The maximum dimension d1 of the first groove 321 along the third direction can be the maximum span dimension of the first groove 321 along the third direction. The maximum dimension d2 of the second mounting hole 320 along the third direction can be the maximum span dimension of the second mounting hole 320 along the third direction. A vernier caliper or a coordinate measuring machine can be used to measure the maximum dimension d1 of the first groove 321 along the third direction and the maximum dimension d2 of the second mounting hole 320 along the third direction on the second limiting component 220, and the ratio d1 / d2 can be calculated.

[0117] The ratio d1 / d2 reflects the size ratio of the first groove 321 relative to the second mounting hole 320. If the groove size of the first groove 321 is too small, the stress buffer space it can provide is limited, and its ability to alleviate local stress concentration is insufficient. If d1 / d2 is greater than 1, the size of the first groove 321 is too large, which will result in too small a remaining effective cross-sectional area around the second mounting hole 320, thus reducing the shear and tensile strength around the hole. Controlling d1 / d2 between 0.3 and 1 can provide sufficient stress buffer space for the structure without sacrificing the mechanical strength around the hole.

[0118] In the technical solution provided in this application embodiment, by limiting the maximum size ratio of the first groove 321 and the second mounting hole 320 in the third direction to within the range of 0.3 to 1, the tensile strength of the material around the second mounting hole 320 and the stress buffering capacity of the first groove 321 are taken into account, thereby achieving a reasonable configuration of structural bearing capacity and fatigue resistance.

[0119] In some embodiments, the ratio d3 of the distance d3 between the first groove 321 and the short side of the first end 221 to the maximum dimension d2 of the second mounting hole 320 along the third direction satisfies 0.2≤d3 / d2≤2.

[0120] The distance d3 between the first groove 321 and the short side of the first end 221 can be the minimum distance from the outermost edge of the first groove 321 to the short side of the first end 221.

[0121] The ratio d3 / d2 controls the relative proportion of the edge distance between the first groove 321 and the short side of the end of the second limiting component 220. When d3 / d2 is too small, the groove is too close to the short side of the end, resulting in insufficient edge allowance at the end, which can easily lead to tearing failure of the end material under load. When d3 / d2 is greater than 2, the end extends too long, increasing the useless cantilever length of the second limiting component 220 and reducing the space utilization rate inside the battery pack. Controlling d3 / d2 between 0.2 and 2 ensures that the end has sufficient edge strength to resist shear tearing and also reduces structural redundancy at the end.

[0122] In the technical solution provided in this application embodiment, by limiting the ratio of the distance between the first groove 321 and the short side to the size of the second mounting hole 320 to between 0.2 and 2, the material allowance at the end edge is reasonably optimized, reducing the risk of tearing failure at the end, while improving the compactness and space utilization of the second limiting component 220.

[0123] In some embodiments, the distance d3 between the first groove 321 and the short side of the first end 221 satisfies: 5mm≤d3≤10mm.

[0124] The distance d3 between the first groove 321 and the short side of the first end 221 is limited to the range of 5 mm to 10 mm, which can match the spatial envelope requirements of the steel pressure strip end in the power battery pack. A distance of more than 5 mm ensures that the end edge has sufficient fatigue tensile allowance after stamping or processing; a distance of less than 10 mm ensures that the end size is not too large and thus does not interfere with the surrounding high-voltage copper busbar or cell housing, thereby achieving good fatigue strength and assembly compatibility within a limited space.

[0125] In the technical solution provided in this application embodiment, by limiting the distance between the first groove 321 and the short side of the first end 221 to within the range of 5 mm to 10 mm, the battery device 10 can be compactly arranged, while improving the fatigue tensile strength of the end edge and mitigating the risk of end breakage due to collision or expansion.

[0126] In some embodiments, an electrical device includes a battery device 10 as described in any of the foregoing embodiments, wherein the battery device 10 is used to provide electrical energy.

[0127] The battery device 10, which possesses the aforementioned anti-fracture and stress-relieving capabilities, is applied to electrical devices as their power source or energy storage. When the electrical device undergoes prolonged charge-discharge cycles and road vibrations during driving or operation, the second limiting component 220 inside the battery device 10 can mitigate problems such as short circuits or secondary failures caused by the repeated action of the expansion force of the battery cell 20 leading to the breakage of the limiting component, thereby improving the reliability of the electrical device.

[0128] Finally, it should be noted that the above embodiments are 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: Multiple battery cells (20) are arranged along a first direction; A first limiting component (210) is disposed at one end of the plurality of battery cells (20) along the first direction; The second limiting component (220) is disposed on one side of the plurality of battery cells (20) along the second direction and extends along the first direction. The second limiting component (220) has a first mounting hole (310) and a second mounting hole (320) disposed along the first direction at its first end (221) along the first direction. The second mounting hole (320) is closer to the short side of the first end (221) than the first mounting hole (310). The second direction is perpendicular to the first direction. The second limiting component (220) is fixedly connected to the first limiting component (210) through the first mounting hole (310) and the second mounting hole (320). The second mounting hole (320) is provided with a first groove (321) recessed in the direction opposite to the first mounting hole (310) in the first direction.

2. The battery device according to claim 1, characterized in that, Along the first direction away from the first mounting hole (310), the size of the first groove (321) gradually decreases along the third direction; The third direction is perpendicular to both the first direction and the second direction.

3. The battery device according to claim 1, characterized in that, The battery device also includes: The first reinforcing member (240) is stacked on top of the first end (221) of the second limiting member (220), and the first reinforcing member (240) is disposed between the second limiting member (220) and the first limiting member (210).

4. The battery device according to claim 3, characterized in that, The first reinforcing component (240) is provided with a first through hole (410) and a second through hole (420). The first through hole (410) is correspondingly provided with the first mounting hole (310), and the second through hole (420) is correspondingly provided with the second mounting hole (320).

5. The battery device according to claim 4, characterized in that, The shape of the second through hole (420) matches the shape of the second mounting hole (320).

6. The battery device according to claim 1, characterized in that, The battery device also includes: A third limiting component (230) is provided at the other end of the plurality of battery cells (20) along the first direction; The second limiting member (220) has a third mounting hole (330) and a fourth mounting hole (340) disposed along the first direction at its second end (222) along the first direction. The fourth mounting hole (340) is closer to the short side of the second end (222) than the third mounting hole (330). The second limiting component (220) is fixedly connected to the third limiting component (230) through the third mounting hole (330) and the fourth mounting hole (340).

7. The battery device according to claim 6, characterized in that, The fourth mounting hole (340) is provided with a second groove (341) recessed in the direction opposite to the third mounting hole (330) in the first direction.

8. The battery device according to claim 6, characterized in that, The battery device also includes: The second reinforcing member (250) is stacked on top of the second end (222) of the second limiting member (220), and the second reinforcing member (250) is disposed between the second limiting member (220) and the third limiting member (230).

9. The battery device according to claim 8, characterized in that, The second reinforcing component (250) is provided with a third through hole (430) and a fourth through hole (440). The third through hole (430) is provided in correspondence with the third mounting hole (330), and the fourth through hole (440) is provided in correspondence with the fourth mounting hole (340).

10. The battery device according to claim 9, characterized in that, The shape of the fourth through hole (440) matches the shape of the fourth mounting hole (340).

11. The battery device according to claim 1, characterized in that, The ratio d1 / d2 of the maximum dimension d1 of the first groove (321) along the third direction and the maximum dimension d2 of the second mounting hole (320) along the third direction satisfies 0.3≤d1 / d2≤1, wherein the third direction is perpendicular to the first direction and the second direction.

12. The battery device according to any one of claims 1 to 11, characterized in that, The ratio d3 of the distance d3 between the first groove (321) and the short side of the first end (221) to the maximum dimension d2 of the second mounting hole (320) along the third direction satisfies 0.2≤d3 / d2≤2, wherein the third direction is perpendicular to the first direction and the second direction.

13. The battery device according to any one of claims 1 to 11, characterized in that, The distance d3 between the first groove (321) and the short side of the first end (221) satisfies: 5mm≤d3≤10mm.

14. An electrical appliance, characterized in that, include: The battery device according to any one of claims 1 to 13, wherein the battery device is used to provide electrical energy.

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