Battery device and electric equipment

Abstract

The embodiment of the utility model discloses a battery device and electric equipment. The battery device comprises a box body, a plurality of single batteries and an end plate, the box body is provided with an accommodating space, and the box body comprises a top cover; the plurality of single batteries are arranged along the first direction and are accommodated in the accommodating space; the end plate is accommodated in the accommodating space and is arranged at at least one end of the battery monomer along the first direction; wherein the end plates are connected with the top cover through fasteners, and the battery monomers are connected with the top cover through structural adhesive. According to the battery device and the electric equipment provided by the embodiment of the invention, the stability and 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 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 battery technology, the structural and mechanical properties of battery devices are crucial, directly affecting their reliability and lifespan. Therefore, improving battery device performance is a pressing technical challenge. Utility Model Content

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

[0005] In a first aspect, this application provides a battery device, comprising: a housing, a plurality of battery cells, and an end plate, wherein the housing has a receiving space and includes a top cover; a plurality of battery cells arranged along a first direction, the plurality of battery cells being received in the receiving space, and a battery cell assembly including a plurality of battery cells arranged along the first direction; and an end plate, the end plate being received in the receiving space and disposed at at least one end of a battery cell along the first direction; wherein the end plate and the top cover are connected by fasteners, and the battery cells and the top cover are connected by structural adhesive.

[0006] In the technical solution of this application embodiment, by providing an end plate at at least one end of the battery cell along the first direction, the expansion force of the battery cell can be resisted, reducing the risk of the battery cell assembly moving or deforming due to the expansion force. Furthermore, by connecting the end plate to the top cover with fasteners, and the battery cell to the top cover with structural adhesive, the end plate can resist the expansion force of the battery cell without the need for other structural components to support it. This simplifies the overall structure of the battery device, improves the overall anti-expansion performance of the battery device, and enhances the overall strength of the battery device, thereby improving the stability and reliability of the battery device.

[0007] In some embodiments of the first aspect, in the second direction, the end plate and the top cover are spaced apart, and a connector is provided between the end plate and the top cover, and the connector is connected to the top cover by fasteners; wherein, on a plane perpendicular to the second direction, the orthographic projection area of ​​the connector is smaller than the orthographic projection area of ​​the end plate, the second direction is perpendicular to the first direction and the second direction is the thickness direction of the battery device.

[0008] In the technical solution of this application embodiment, an end plate and a top cover are spaced apart, and a connector is provided between the end plate and the top cover. The connector is connected to the top cover by fasteners. Specifically, on a plane perpendicular to the second direction, the projected area of ​​the connector is smaller than the projected area of ​​the end plate. This allows for timely balancing of internal pressure fluctuations in the battery device caused by the breathing effect of individual battery cells under normal operating conditions, improving the reliability of the battery device. Furthermore, in the event of thermal runaway, a pre-set venting path is provided for the rapid increase in internal pressure, enabling rapid pressure release and improving the reliability and stability of the battery device. Additionally, during thermal runaway, the high-temperature, high-speed airflow and ejected material released by the pressure relief mechanism can be quickly guided to the outside of the battery device through this gap, further enhancing the overall reliability and stability of the battery device.

[0009] In some embodiments of the first aspect, the top cover includes a first through hole, and the battery device further includes a reinforcing member disposed between the connector and the top cover. The reinforcing member includes a main body portion and an extension portion formed by the main body portion protruding toward the top cover. The extension portion passes through the first through hole and is provided with a second through hole. A fastener passes through the second through hole and is connected to the connector.

[0010] In the technical solution of this application embodiment, the extension passes through the first through hole and the extension is provided with a second through hole; the fastener passes through the second through hole and connects with the connector, which can reduce the risk of the top cover deforming due to the left and right movement of the fastener when the battery device is subjected to external impact, and at the same time reduce the risk of failure to resist expansion force due to the deformation of the top cover, so as to improve the overall anti-expansion force performance of the battery device and improve the overall reliability and stability of the battery device.

[0011] In some embodiments of the first aspect, in the second direction, the extension exceeds the size of the top cover portion. Satisfy: 0.3mm≤ ≤1mm.

[0012] In the technical solution of this application embodiment, the extension portion exceeds the size of the top cover portion. Setting it within this range can, on the one hand, reduce the risk of deformation of the top cover due to lateral movement of the fasteners, and on the other hand, reduce the risk of failure to resist expansion force due to deformation of the top cover, thereby improving the overall expansion force resistance performance of the battery device and improving the overall reliability and stability of the battery device; on the other hand, it can improve the overall space utilization of the battery device.

[0013] In some embodiments of the first aspect, the wall thickness of the extension Satisfy: 1mm≤ ≤3mm.

[0014] In the technical solution of this application embodiment, the wall thickness of the extension is... Setting it within this range can, on the one hand, reduce the risk of deformation of the top cover due to lateral movement of the fasteners, and on the other hand, reduce the risk of failure to resist expansion force due to deformation of the top cover, thereby improving the overall expansion force resistance performance of the battery device and improving the overall reliability and stability of the battery device; on the other hand, it can improve the overall space utilization of the battery device.

[0015] In some embodiments of the first aspect, in the second direction, the size of the main body portion Satisfy: 0.3mm≤ ≤1mm.

[0016] In the technical solution of this application embodiment, by adjusting the size of the main body in the second direction... Setting it within this range can improve the overall space utilization of the battery device; on the other hand, it can reduce the risk of deformation of the top cover due to the lateral movement of the fasteners, and reduce the risk of failure to resist expansion force due to the deformation of the top cover, thereby improving the overall expansion force resistance performance of the battery device and improving the overall reliability and stability of the battery device.

[0017] In some embodiments of the first aspect, the main body and the top cover are connected by adhesive.

[0018] In the technical solution of this application embodiment, by connecting the main body and the top cover with adhesive, the sealing performance between the reinforcing member and the top cover can be improved, as well as the sealing performance between the end plate and the top cover can be enhanced.

[0019] In some embodiments of the first aspect, the connector is connected to the end plate by welding.

[0020] In the technical solution of this application embodiment, the stability between the connector and the end plate is improved by welding the connector and the end plate, thereby further improving the stability between the fastener and the connector, and thus improving the overall stability and reliability of the battery device.

[0021] In some embodiments of the first aspect, the battery cell has a first wall on which electrode terminals are disposed; the battery device further includes a busbar component disposed on the first wall and electrically connected to the electrode terminals; wherein the busbar component is connected to the top cover by structural adhesive.

[0022] In the technical solution of this application embodiment, the busbar component and the top cover are connected by structural adhesive. When the battery cell is working, it will expand and contract with heat. The expansion coefficients of the busbar component and the top cover are different. The elasticity of the structural adhesive can absorb and buffer this stress, protect the battery cell, and improve the overall stability and reliability of the battery device.

[0023] In some embodiments of the first aspect, the connector has a groove at one end along the second direction and near the top cover, and the battery device further includes a seal disposed in the groove.

[0024] In the technical solution of this application embodiment, by setting a groove at one end of the connector along the second direction and close to the top cover, and setting the sealing member in the groove, the sealing performance between the top cover and the end plate during the fastening process can be improved, thereby improving the overall reliability and stability of the battery device.

[0025] In a second aspect, an electrical device is provided, including a battery device as described in the first aspect or any embodiment thereof, the battery device being used to provide electrical energy. Attached Figure Description

[0026] Figure 1 A schematic diagram of the structure of a vehicle according to an embodiment of this application is shown.

[0027] Figure 2 A schematic diagram of the structure of a battery device according to an embodiment of this application is shown.

[0028] Figure 3 A plan view of a battery device according to an embodiment of this application is shown.

[0029] Figure 4 A cross-sectional view of a battery device according to an embodiment of this application is shown.

[0030] Figure 5 A schematic diagram of a reinforcing member according to an embodiment of this application is shown.

[0031] Figure 6 A structural schematic diagram of another reinforcing member according to an embodiment of this application is shown.

[0032] Figure 7 A partial plan view of a battery device according to an embodiment of this application is shown.

[0033] Figure 8 An enlarged schematic diagram of the structure of a battery device according to an embodiment of this application is shown.

[0034] The labels for each figure are as follows:

[0035] 1-Vehicle; 10-Battery unit; 30-Controller; 40-Motor; 11-Box; 20-Battery cell; 15-End plate; 12-Top cover; 152-Structural adhesive; 151-Fastener; 13-Connector; 121-First through hole; 16-Reinforcing member; 161-Main body; 162-Extension; 1621-Second through hole; 201-First wall; 2011-Electrode terminal; 2012-Pressure relief mechanism; 61-Busting component; 131-Groove; 17-Seal; 70-Battery cell assembly; 21-Frame; 22-Base plate.

[0036] The accompanying drawings are not drawn to scale. Detailed Implementation

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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).

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

[0045] Unless otherwise specified, all technical features and optional technical features of this application may be combined to form new technical solutions.

[0046] 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.

[0047] 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.

[0048] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator, with the separator positioned between the positive and negative electrodes. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0049] In some embodiments, the battery cell may include a casing. The casing may be a steel casing, an aluminum casing, a plastic casing (such as a polypropylene casing), a composite metal casing (such as a copper-aluminum composite casing), or an aluminum-plastic film, etc. In some embodiments, the casing may be a sealed structure or a non-sealed structure. As an example, when the casing is a non-sealed structure, the casing serves to protect the electrode assembly, and a sealing bag is included between the casing and the electrode assembly to encapsulate the electrode assembly and electrolyte. Specifically, the sealing bag may be a bag-shaped insulating component or an aluminum-plastic film. When the casing is a sealed structure, it is used to encapsulate components such as the electrode assembly and electrolyte.

[0050] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries. This application does not have any particular limitations.

[0051] In some embodiments, the housing includes an end cap and a housing, the housing having an opening, and the end cap covering the opening. The housing may have one or more openings. The end cap may also have one or more.

[0052] 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.

[0053] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0054] 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.

[0055] In some embodiments, the battery device may be a battery pack, which includes a housing and individual battery cells, with the individual battery cells or battery modules housed in a top cover.

[0056] In some embodiments, the housing in this application can be part of the vehicle's chassis structure. For example, a portion of the housing can be at least a part of the vehicle's floor, or a portion of the housing can be at least a part of the vehicle's crossbeams and longitudinal beams.

[0057] With increasing environmental pollution, the new energy industry is attracting growing attention. Battery technology is a crucial factor in the development of this industry. In modern battery technology, especially in high-energy-density lithium-ion battery applications, individual battery cells experience significant expansion forces during charging and discharging due to volume changes or temperature increases caused by lithium-ion insertion and extraction. The accumulation of these expansion forces can lead to uneven stress distribution within the battery pack, structural deformation, increased contact resistance, and ultimately affect the reliability and cycle life of the battery device. Furthermore, in practical applications such as electric vehicles and energy storage systems, battery devices must withstand external mechanical loads such as vibration and impact. Therefore, effectively suppressing the expansion effect of individual battery cells and optimizing structural design to improve the overall stability of the battery device has become a critical issue that urgently needs to be addressed in the current battery technology field.

[0058] This application provides a battery device and an electrical appliance that can solve the above-mentioned problems. The battery device of this application includes a housing, multiple battery cells, and an end plate. Specifically, the housing has a receiving space and includes a top cover; multiple battery cells arranged along a first direction are received within the receiving space; the end plate is received within the receiving space and disposed at at least one end of each battery cell along the first direction; wherein the end plate and the top cover are connected by fasteners, and the battery cells and the top cover are connected by structural adhesive.

[0059] In the technical solution of this application embodiment, by providing an end plate at at least one end of the battery cell along the first direction, the expansion force of the battery cell can be resisted, reducing the risk of the battery cell assembly moving or deforming due to the expansion force. Furthermore, by connecting the end plate to the top cover with fasteners, and the battery cell to the top cover with structural adhesive, the end plate can resist the expansion force of the battery cell without the need for other structural components to support it. This simplifies the overall structure of the battery device, improves the overall anti-expansion performance of the battery device, and enhances the overall strength of the battery device, thereby improving the stability and reliability of the battery device.

[0060] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use battery devices.

[0061] Electrical equipment 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 equipment.

[0062] For ease of explanation, the following embodiments use a vehicle as an example of electrical equipment.

[0063] 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 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, 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.

[0064] Figure 2 A schematic diagram of the structure of a battery device 10 according to an embodiment of this application is shown; Figure 3 A schematic plan view of a battery device 10 according to an embodiment of this application is shown; Figure 4 A cross-sectional view of a battery device 10 according to an embodiment of this application is shown, for example, Figure 4 As shown Figure 3 A cross-sectional schematic diagram of the battery device 10 shown.

[0065] In some embodiments, such as Figures 2 to 4As shown, the battery device 10 of this application embodiment may include a housing 11, a plurality of battery cells 20, and an end plate 15. The housing 11 has a receiving space and includes a top cover 12. A plurality of battery cells 20 are arranged along a first direction X and are received in the receiving space. The battery cell assembly 70 includes a plurality of battery cells 20 arranged along the first direction X. The end plate 15 is received in the receiving space and is disposed at at least one end of the battery cell 20 along the first direction X. The end plate 15 is connected to the top cover 12 by fasteners 151, and the battery cell 20 is connected to the top cover 12 by structural adhesive 152.

[0066] For ease of description, this application mainly uses a near-rectangular-pitch battery device 10 as an example. Based on this rectangular-pitch battery device 10, this application defines three reference directions. The length direction of the battery device 10 is the first direction X, the height direction is the second direction Z, and the width direction is the third direction Y. The width, length, and height directions of the battery device 10 are perpendicular to each other, and the width dimension of the battery device 10 is smaller than its length dimension. Alternatively, the arrangement direction of the multiple battery cells 20 is the first direction X. In a battery cell assembly 70 composed of multiple battery cells 20, the arrangement direction of the multiple battery cell assemblies 70 is the third direction Y.

[0067] It should be understood that the box 11 in the embodiments of this application may include a top cover 12 and a bottom plate 22, and the structure of the top cover 12 and the bottom plate 22 may be configured according to actual applications. For example, the top cover 12 and the bottom plate 22 may both be hollow cuboids with one face as an opening, the opening of the top cover 12 and the opening of the bottom plate 22 are opposite to each other and are fastened together to form a closed cavity.

[0068] For example, the top cover 12 is a hollow cuboid with one side being an open surface, and the bottom plate 22 is a plate-like structure with a certain thickness. The top cover 12 covers the bottom plate 22 to form a closed chamber together.

[0069] 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 cuboid shown can also be different. Figure 2 The embodiments shown are cylindrical or other shapes, but are not limited to these.

[0070] In some embodiments, to improve the space utilization within the battery device 10, the battery cells 20 within the battery device 10 are typically arranged in a certain pattern. For example, as... Figure 2 As shown, the battery device 10 may include a plurality of battery cells 20 arranged along a first direction X; further, if the number of battery cells 20 in the battery device 10 is large, the battery device 10 may also include a plurality of battery cell assemblies 70 arranged along a third direction Y.

[0071] The battery device 10 in this application embodiment may include an end plate 15. The number of end plates 15 may be one or more, and the end plate 15 may be disposed at one end of the battery cell 20 along the first direction X. Specifically:

[0072] In one possible implementation, the end plate 15 may be disposed at at least one end of the battery cell assembly 70 along the first direction X.

[0073] For example, one end plate 15 can be provided and abut against any one end of the battery cell assembly 70 along the first direction X. Alternatively, two end plates 15 can be provided and abut against both ends of the battery cell assembly 70 along the first direction X. Yet another example is that multiple end plates 15 can be provided, where the battery device 10 includes multiple battery cell assemblies 70, and the multiple end plates 15 are provided in a one-to-one correspondence with the multiple battery cell assemblies 70, or one end plate 15 can be provided at each end of each battery cell assembly 70 along the first direction X.

[0074] In another possible implementation, the end plate 15 can be positioned between two adjacent battery cells 20 along the first direction X.

[0075] For example, one end plate 15 can be provided and positioned between any two battery cells 20. Alternatively, two end plates 15 can be provided and positioned between any two battery cells 20.

[0076] In some embodiments, the end plate 15 and the top cover 12 are connected by fasteners 151. The number of fasteners 151 can be one or more. For example, the number of fasteners 151 can be one to connect the end plate 15 and the top cover 12; or the number of fasteners 151 can be multiple, spaced apart along the second direction Z, to connect the end plate 15 and the top cover 12, making the connection more stable. When the battery cell 20 expands, the expansion force generated by the battery cell 20 can be transmitted to the top cover 12 through the end plate 15, so that the top cover 12 can withstand part of the expansion force, thereby reducing the risk of local structural failure of the end plate 15 due to the concentration of expansion force and improving the expansion resistance of the end plate 15.

[0077] In some embodiments, the connection between the battery cell 20 and the top cover 12 via structural adhesive 152 can be implemented in the following two ways:

[0078] In one possible implementation, the wall of the battery cell 20 near the top cover 12 is not provided with a pressure relief mechanism and / or electrode terminals 2011, and the wall can be directly connected and fixed to the top cover 12 by structural adhesive 152.

[0079] Another possible implementation is that the battery cell 20 is provided with a pressure relief mechanism and / or electrode terminals 2011 on the wall near the top cover 12, and a busbar is provided on the side of the wall near the top cover 12. In this case, the top cover 12 can be connected to the busbar by adhesive.

[0080] Optionally, the part of the end plate 15 that contacts the top cover 12 can also be connected by adhesive to improve the overall sealing of the battery device 10 and the overall anti-expansion performance of the battery device 10.

[0081] Optionally, the battery device 10 also includes a frame 21, which is disposed between the top cover 12 and the bottom plate 22 and has an opening. The frame 21 is connected to the top cover 12 and the bottom plate 22 to form an accommodating space. The two ends of the end plate 15 along the second direction Z can also be connected to the frame 21, and the connection method between the two is not limited. For example, the end plate 15 and the frame 21 can be connected by connectors 13, fasteners 151 such as bolts, adhesive bonding, snap-fitting, welding, or hot-melt bonding, so that when the battery cell 20 expands, the expansion force generated by the battery cell 20 can also be transmitted to the frame 21, thereby enabling the frame 21 to withstand part of the expansion force, reducing the risk of local structural failure of the end plate 15 due to the concentration of expansion force, and improving the expansion resistance of the end plate 15.

[0082] It should be understood that the end plate 15 can be a plate-like structure, extending along the second direction Z to connect with the top cover 12 and extending along the third direction Y to connect with the frame 21. The end plate 15 can also be composed of one or more beams. For example, the end plate 15 can be formed by two crossbeams arranged along the second direction Z, both of which abut against the end of the battery cell assembly 70. As another example, the end plate 15 can be formed by two crossbeams and one vertical beam, with the vertical beam connecting the two crossbeams and abutting against the end of the battery cell assembly 70 together with the two crossbeams.

[0083] In the technical solution of this application embodiment, by providing an end plate 15 at at least one end of the battery cell 20 along the first direction X, the expansion force of the battery cell 20 can be resisted, reducing the risk of the battery cell assembly 70 moving or deforming due to the expansion force. In addition, the end plate 15 is connected to the top cover 12 by fasteners 151, and the battery cell 20 is connected to the top cover 12 by structural adhesive 152. The end plate 15 can resist the expansion force of the battery cell 20 without the need for other structural components to support it, simplifying the overall structure of the battery device 10, improving the overall anti-expansion performance of the battery device 10, and improving the overall strength of the battery device 10, thereby improving the stability and reliability of the battery device 10.

[0084] According to some embodiments of this application, optionally, reference can continue in the second direction Z. Figures 2 to 4 The end plate 15 and the top cover 12 are spaced apart, and a connector 13 is provided between the end plate 15 and the top cover 12. The connector 13 and the top cover 12 are connected by fasteners 151. In the plane perpendicular to the second direction Z, the orthographic projection area of ​​the connector 13 is smaller than the orthographic projection area of ​​the end plate 15. The second direction Z is perpendicular to the first direction X and the second direction Z is the thickness direction of the battery device 10.

[0085] It should be understood that the end plate 15 and the top cover 12 are spaced apart, or in other words, a clearance area is provided between the end plate 15 and the top cover 12 in the second direction Z. The size of the clearance area along the second direction Z can be set by taking into account factors such as the overall space utilization of the battery device 10 and the clearance of gas. This application does not impose any limitations on this.

[0086] In some embodiments, when a pressure relief mechanism is provided on the wall of the battery cell 20 near the top cover 12, the provision of a clearance area can provide a pre-set release path for the rapid increase in internal pressure of the battery device 10 under thermal runaway conditions, and can quickly release pressure.

[0087] In some embodiments, after a clearance area is provided between the end plate 15 and the top cover 12, a connector 13 can be provided between the end plate 15 and the top cover 12. In a plane perpendicular to the second direction Z, the orthographic projection area of ​​the connector 13 can be slightly larger than the orthographic projection area of ​​the fastener 151, and the orthographic projection area of ​​the connector 13 is smaller than the orthographic projection area of ​​the end plate 15. This allows for the connection between the end plate 15 and the top cover 12 while leaving more space for rapid pressure release.

[0088] Specifically, one end of the connector 13 abuts against the end plate 15, and the other end abuts against the top cover 12. The connector 13 can be connected to the end plate 15 by welding, gluing, fasteners 151, etc. The connector 13 can also be connected to the top cover 12 by welding, gluing, etc. It should be understood that the connection between the connector 13 and the top cover 12 described here refers to the connection between the connector 13 and the top cover 12 by fasteners 151, and can also be connected by welding or gluing.

[0089] It should be understood that the connector 13 can be metal, or a metal material or a composite material. The shape of the connector 13 can be a cuboid to make the connection more stable. The shape of the connector 13 can also be a column or a cone, or an irregular shape. This application does not limit it in any way.

[0090] Alternatively, the end plate 15 and the top cover 12 may not be spaced apart. For example, if the wall of the battery cell 20 near the top cover 12 is used to install the electrode terminal 2011 and / or the pressure relief mechanism, the end plate 15 and the top cover 12 may be abutted together and directly fastened together by the fastener 151.

[0091] In the technical solution of this application embodiment, the end plate 15 and the top cover 12 are spaced apart, and a connector 13 is provided between the end plate 15 and the top cover 12. The connector 13 and the top cover 12 are connected by fasteners 151. In a plane perpendicular to the second direction Z, the projected area of ​​the connector 13 is smaller than the projected area of ​​the end plate 15. This allows for timely balancing of internal pressure fluctuations in the battery device 10 caused by the breathing effect of the battery cells 20 under normal operating conditions, improving the reliability of the battery device 10. Furthermore, in the event of thermal runaway, a pre-set venting path is provided for the rapid increase in internal pressure of the battery device 10, enabling rapid pressure release and improving the reliability and stability of the battery device 10. Additionally, during thermal runaway, the high-temperature, high-speed airflow and ejected material released by the pressure relief mechanism can be quickly guided to the outside of the battery device 10 through this gap, further enhancing the overall reliability and stability of the battery device 10.

[0092] Figure 5 A structural schematic diagram of a reinforcing member 16 according to an embodiment of this application is shown. Figure 6 A structural schematic diagram of another reinforcing member 16 according to an embodiment of this application is shown.

[0093] Optionally, based on some embodiments of this application, reference may continue to be made to... Figures 2 to 6The top cover 12 includes a first through hole 121. The battery device 10 also includes a reinforcing member 16, which is disposed between the connector 13 and the top cover 12. The reinforcing member 16 includes a main body 161 and an extension 162 formed by the main body 161 protruding towards the top cover 12. The extension 162 passes through the first through hole 121 and is provided with a second through hole 1621. The fastener 151 passes through the second through hole 1621 and is connected to the connector 13.

[0094] It should be understood that the number of fasteners 151 corresponds one-to-one with the number of first through holes 121 and second through holes 1621. For example, along the third direction Y, the top cover 12 includes multiple first through holes 121, and correspondingly, the number of fasteners 151 is also multiple, and the number of second through holes 1621 is also multiple.

[0095] In some embodiments, the main body 161 is a flat or sheet-like component extending in the third direction Y, and is disposed between the connector 13 and the top cover 12.

[0096] The length of the main body 161 along the first direction X can be the same as the length of the end plate 15 along the first direction X, which can save materials and reduce the overall energy density of the battery device 10. Alternatively, it can be described that the orthographic projection of the main body 161 and the orthographic projection of the end plate 15 completely coincide in a plane perpendicular to the second direction Z.

[0097] Alternatively, the length of the main body 161 along the first direction X may be less than the length of the end plate 15 along the first direction X.

[0098] It should be understood that the main body 161 also has a through hole. The through hole of the main body 161 is exactly the same in position and diameter as the second through hole 1621, and is used for the fastener 151 to pass through.

[0099] In some embodiments, the diameter of the second through hole 1621 and the diameter of the fastener 151 can satisfy the following condition: the diameter of the second through hole 1621 is greater than or equal to the diameter of the fastener 151 plus 2 mm. Alternatively, the difference between the diameter of the second through hole 1621 and the diameter of the fastener 151 can be greater than or equal to 2 mm. It should be understood that this design allows the fastener 151 to pass precisely through the second through hole 1621.

[0100] The reinforcing member 16 can be made of metal, non-metal, or composite material, and this application does not impose any restrictions on it.

[0101] Optionally, in the plane of the second direction Z, the projected area of ​​the connector 13 can be larger than the projected area of ​​the first through hole 121, which can be used for the connection between the end plate 15 and the top cover 12 while leaving more space for rapid pressure release.

[0102] In the technical solution of this application embodiment, the extension 162 passes through the first through hole 121, and the extension 162 is provided with a second through hole 1621; the fastener 151 passes through the second through hole 1621 and is connected to the connector 13. This can reduce the risk of the top cover 12 deforming due to the left and right movement of the fastener 151 when the battery device 10 is subjected to external impact, and at the same time reduce the risk of failure to resist expansion force due to the deformation of the top cover 12, thereby improving the overall anti-expansion force performance of the battery device 10 and improving the overall reliability and stability of the battery device 10.

[0103] According to some embodiments of this application, optionally, such as Figure 6 As shown, in the second direction Z, the extension 162 extends beyond the portion of the top cover 12. Satisfy: 0.3mm≤ ≤1mm.

[0104] It should be understood that the portion of the extension 162 that extends beyond the top cover 12 refers to the portion of the extension 162 that extends further outward from the edge of the top cover 12.

[0105] For example, in the second direction Z, the extension 162 extends beyond the dimensions of the top cover 12 portion. The thickness can be 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, etc. Alternatively, its value can be within the range obtained by combining any two of the above values.

[0106] In the technical solution of this application embodiment, the extension portion 162 extends beyond the top cover 12 by a certain dimension. Setting it within this range can, on the one hand, reduce the risk of deformation of the top cover 12 due to the left and right movement of the fastener 151, and on the other hand, reduce the risk of failure to resist expansion force due to the deformation of the top cover 12, thereby improving the overall anti-expansion force performance of the battery device 10 and improving the overall reliability and stability of the battery device 10; on the other hand, it can improve the overall space utilization of the battery device 10.

[0107] Optionally, based on some embodiments of this application, reference may continue to be made to... Figure 6 The wall thickness of extension 162 Satisfy: 1mm≤ ≤3mm.

[0108] Among them, the wall thickness of the extension 162 This refers to the distance of the solid material between the inner and outer walls of the extension 162.

[0109] For example, the thickness of the inner wall of the extension 162 It can be 1mm, 1.4mm, 1.8mm, 2.2mm, 2.6mm, 3mm, etc. Or, its value is within the range obtained by any combination of the above two values.

[0110] Preferably, the wall thickness of the extension 162 is... It can be set to 1.5mm.

[0111] In the technical solution of this application embodiment, the wall thickness of the extension 162 is increased. Setting it within this range can, on the one hand, reduce the risk of deformation of the top cover 12 due to the left and right movement of the fastener 151, and on the other hand, reduce the risk of failure to resist expansion force due to the deformation of the top cover 12, thereby improving the overall anti-expansion force performance of the battery device 10 and improving the overall reliability and stability of the battery device 10; on the other hand, it can improve the overall space utilization of the battery device 10.

[0112] Optionally, based on some embodiments of this application, reference may continue to be made to... Figure 6 In the second direction Z, the dimensions of the main body 161 Satisfy: 0.3mm≤ ≤1mm.

[0113] In some embodiments, the dimensions of the main body 161 in the second direction Z are... The thickness can be 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, etc. Alternatively, its value can be within the range obtained by combining any two of the above values.

[0114] In the technical solution of this application embodiment, by adjusting the size of the main body 161 in the second direction Z... Setting it within this range can improve the overall space utilization of the battery device 10; on the other hand, it can reduce the risk of deformation of the top cover 12 caused by the left and right movement of the fastener 151, and reduce the risk of failure to resist expansion force due to deformation of the top cover 12, thereby improving the overall anti-expansion force performance of the battery device 10 and improving the overall reliability and stability of the battery device 10.

[0115] Optionally, based on some embodiments of this application, reference may be made to... Figures 2 to 6 The main body 161 and the top cover 12 are connected by adhesive.

[0116] Alternatively, the main body 161 and the top cover 12 can also be connected by welding or other means, and this application does not impose any limitations on this.

[0117] In the technical solution of this application embodiment, by connecting the main body 161 and the top cover 12 by adhesive bonding, the sealing performance between the reinforcing member 16 and the top cover 12 can be improved, as well as the sealing performance between the end plate 15 and the top cover 12 can be enhanced.

[0118] Optionally, based on some embodiments of this application, reference may be made to... Figures 2 to 6 The connector 13 is connected to the end plate 15 by welding.

[0119] Alternatively, the connector 13 and the end plate 15 can also be connected by adhesive, fasteners 151, etc., and this application does not impose any limitations on this.

[0120] In the technical solution of this application embodiment, the connection between the connector 13 and the end plate 15 is improved by welding, thereby improving the stability between the connector 13 and the end plate 15, further improving the stability between the fastener 151 and the connector 13, and improving the overall stability and reliability of the battery device 10.

[0121] Figure 7 A partial plan view of a battery device 10 according to an embodiment of this application is shown.

[0122] Optionally, based on some embodiments of this application, reference may continue to be made to... Figures 2 to 7 The battery cell 20 has a first wall 201, and the first wall 201 is provided with electrode terminals 2011; the battery device 10 also includes a current-combining component 61, which is disposed on the first wall 201 and electrically connected to the electrode terminals 2011; wherein, the current-combining component 61 is connected to the top cover 12 by structural adhesive 152.

[0123] It should be understood that the first wall 201 is the wall of the battery cell 20 near the top cover 12.

[0124] In some embodiments, there is generally a gap between the busbar 61 and the top cover 12. During the transportation of the battery device 10 or when it is impacted, this gap causes the top cover 12 to make abnormal noises and also makes the overall stability poor. Based on this, the two are connected by structural adhesive 152, which can improve the sealing between the two, reduce the abnormal noises from the top cover 12, and improve the structural strength and main frequency of the battery device 10.

[0125] In some embodiments, the busbar component 61 and the top cover 12 are connected by structural adhesive 152, or in other words, the busbar component 61 and the top cover 12 are connected by adhesive bonding.

[0126] In the technical solution of this application embodiment, the busbar component 61 is connected to the top cover 12 by structural adhesive 152, so that the battery cell 20 will expand and contract with heat during operation. The expansion coefficients of the busbar component 61 and the top cover 12 are different. The elasticity of the structural adhesive 152 can absorb and buffer this stress, protect the battery cell 20, and improve the overall stability and reliability of the battery device 10.

[0127] In some embodiments, the top cover 12 can be made of metal, non-metal, or composite materials, such as sheet metal, aluminum alloy, fiber and resin matrix composites, etc. Alternatively, the top cover 12 can also be formed by injection molding.

[0128] Optionally, such as Figure 7 As shown, the end plate 15 and the top cover 12 are spaced apart, and a connector 13 is provided between the end plate 15 and the top cover 12. The connector 13 is connected to the top cover 12 by a fastener 151. In this case, a pressure relief mechanism 2012 and / or electrode terminals 2011 can be provided on the wall of the battery cell 20 near the top cover 12. When the battery device 10 is in thermal runaway, the spaced arrangement provides a pre-set venting path for the rapid increase in internal pressure of the battery device 10, which can quickly release pressure and improve the reliability and stability of the battery device 10. In addition, when thermal runaway occurs, the high-temperature, high-speed airflow and jets released by the pressure relief mechanism 2012 can be quickly guided to the outside of the battery device 10 through this space, improving the overall reliability and stability of the battery device 10.

[0129] Figure 8 An enlarged schematic diagram of the structure of a battery device 10 according to an embodiment of this application is shown.

[0130] Optionally, based on some embodiments of this application, reference may continue to be made to... Figures 2 to 8 The connector 13 has a groove 131 at one end along the second direction Z and near the top cover 12. The battery device 10 also includes a seal 17, wherein the seal 17 is disposed in the groove 131.

[0131] The connector 13 is provided with a groove 131 at one end along the second direction Z and near the top cover 12. Specifically, the connector 13 is provided with a groove 131 around the second through hole 1621 at one end along the second direction Z and near the top cover 12. On a plane perpendicular to the second direction Z, the orthographic projection of the groove 131 can be a circular ring; or, the orthographic projection of the groove 131 can also be a square ring, etc. This application does not limit the specific shape of the groove 131.

[0132] It should be understood that the dimension of the seal 17 along the second direction Z can be larger than the dimension of the groove 131. When the fastener 151 connects the connector 13 and the top cover 12, the top cover 12 pressing the seal 17 can improve the sealing between the connector 13 and the top cover 12.

[0133] In some embodiments, the dimension of the groove 131 along the second direction Z is greater than or equal to 2 mm and less than or equal to 4 mm.

[0134] For example, the dimension of the groove 131 along the second direction Z can be 2mm, 2.3mm, 2.6mm, 2.9mm, 3.2mm, 3.6mm, 3.9mm, 4mm, etc. Alternatively, its value is within the range obtained by any combination of the above two values.

[0135] The dimension of the seal 17 along the second direction Z can be higher than the dimension of the groove 131 along the second direction Z. For example, the dimension of the groove along the second direction Z can be set to 2.3 mm, and the dimension of the seal 17 along the second direction Z can be set to 3 mm.

[0136] In the technical solution of this application embodiment, a groove 131 is provided at one end of the connector 13 along the second direction Z and close to the top cover 12, and the sealing member 17 is provided in the groove 131. This can improve the sealing performance between the top cover 12 and the end plate 15 during the fastening process of the fastener 151, thereby improving the overall reliability and stability of the battery device 10.

[0137] This application embodiment also provides an electrical device, including the battery device 10 in any of the above embodiments, the battery device 10 being used to provide electrical energy to the electrical device. Specifically, the electrical device can be the above... Figure 1 The vehicle 1 shown can also be any electrical device that uses the battery device 10.

[0138] In some implementations, the electrical equipment can be a vehicle, a ship, or a spacecraft.

[0139] According to some embodiments of this application, see Figures 2 to 8 This application provides a battery device 10, including: a housing 11, a plurality of battery cells 20, and an end plate 15, wherein the housing 11 has a receiving space and includes a top cover 12; a plurality of battery cells 20 arranged along a first direction X, the plurality of battery cells 20 being received in the receiving space, and a battery cell assembly 70 including a plurality of battery cells 20 arranged along the first direction X; and an end plate 15, the end plate 15 being received in the receiving space and disposed at at least one end of a battery cell 20 along the first direction X; wherein the end plate 15 is connected to the top cover 12 by fasteners 151, and the battery cell 20 is connected to the top cover 12 by structural adhesive 152.

[0140] In the second direction Z, the end plate 15 and the top cover 12 are spaced apart, and a connector 13 is provided between the end plate 15 and the top cover 12. The connector 13 and the top cover 12 are connected by a fastener 151. In a plane perpendicular to the second direction Z, the projected area of ​​the connector 13 is smaller than the projected area of ​​the end plate 15. The second direction Z is perpendicular to the first direction X and is the thickness direction of the battery device 10. The top cover 12 includes a first through hole 121. The battery device 10 also includes a reinforcing member 16, which is disposed between the connector 13 and the top cover 12. The reinforcing member 16 includes a main body 161 and an extension 162 formed by the main body 161 protruding towards the top cover 12. The extension 162 passes through the first through hole 121 and has a second through hole 1621. The fastener 151 passes through the second through hole 1621 and is connected to the connector 13.

[0141] The battery cell 20 has a first wall 201, and the first wall 201 is provided with electrode terminals 2011; the battery device 10 also includes a current-combining component 61, which is disposed on the first wall 201 and electrically connected to the electrode terminals 2011; wherein, the current-combining component 61 is connected to the top cover 12 by structural adhesive 152.

[0142] 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 by, The battery device comprises: a box body (11) having a containing space, the box body (11) comprising a top cover (12); a plurality of battery monomers (20) arranged in a first direction, the plurality of battery monomers (20) being contained in the containing space; an end plate (15) contained in the containing space and arranged at at least one end of the battery monomers (20) in the first direction; wherein the end plate (15) and the top cover (12) are connected by a fastener (151), and the battery monomers (20) and the top cover (12) are connected by structural glue (152).

2. The battery device according to claim 1, characterized by In a second direction, the end plate (15) is arranged spaced apart from the top cover (12), and a connecting piece (13) is arranged between the end plate (15) and the top cover (12), the connecting piece (13) and the top cover (12) being connected by the fastener (151); wherein, in a plane perpendicular to the second direction, the projection area of the connecting piece (13) is smaller than the projection area of the end plate (15), the second direction being perpendicular to the first direction and the second direction being the thickness direction of the battery device.

3. The battery device of claim 2, wherein The top cover (12) comprises a first through hole (121), and the battery device further comprises: a reinforcing piece (16) arranged between the connecting piece (13) and the top cover (12), the reinforcing piece (16) comprising a main body portion (161) and an extension portion (162) protruding from the main body portion (161) towards the top cover (12), the extension portion (162) passing through the first through hole (121), and the extension portion (162) being provided with a second through hole (1621); wherein the fastener (151) passes through the second through hole (1621) to connect with the connecting piece (13).

4. The battery device of claim 3, wherein In the second direction, the extension (162) exceeds the size of the top cover (12) portion satisfies: 0.3 mm ≤ ≤ 1 mm.

5. The battery device of claim 3, wherein The wall thickness of the extension (162) satisfies: 1 mm ≤ ≤ 3 mm.

6. The battery device according to any one of claims 3 to 5, characterized by, In the second direction, the size of the main body portion (161) is satisfies: 0.3 mm ≤ ≤ 1 mm.

7. The battery device according to any one of claims 3 to 5, wherein The main body portion (161) and the top cover (12) are connected by adhesion.

8. The battery device according to any one of claims 2 to 5, wherein The connecting piece (13) and the end plate (15) are connected by welding.

9. The battery device according to any one of claims 1 to 5, wherein The battery monomer (20) has a first wall (201) provided with an electrode terminal (2011); The battery device further comprises a busbar component (61) arranged on the first wall (201) and electrically connected with the electrode terminal (2011); wherein the busbar component (61) and the top cover (12) are connected by the structural glue (152).

10. The battery device according to any one of claims 3 to 5, characterized by, The connecting piece (13) is provided with a groove (131) at one end thereof in the second direction and close to the top cover (12), and the battery device further comprises a sealing piece (17), wherein the sealing piece (17) is arranged in the groove (131).

11. An electrical device, characterized by The battery device according to any one of claims 1 to 10 is used for providing electric energy.

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