Battery device and electric device

Abstract

The utility model is applicable to the technical field of batteries, and provides a battery device and a power utilization device.The battery device comprises a battery monomer assembly, the battery monomer assembly comprises a plurality of battery monomers, each battery monomer comprises a shell, an end cover and an electrode assembly contained in the shell, an opening is formed in one side, in the first direction, of the shell, the end cover covers the opening, and the electrode assembly is arranged in the shell; the end cover comprises an end cover main body and a convex structure, and the convex structure is arranged along the edge of the end cover main body and protrudes in the direction away from the electrode assembly; and at least part of the pressing plate is located on the side, away from the shell, of the end cover, the pressing plate is used for abutting against the end cover body in the first direction, and the pressing plate and the protruding structure are arranged at intervals in the first direction. According to the battery device provided by the embodiment of the invention, the risk that the pressing plate is separated from the battery monomers can be reduced, and the stability of the battery device is improved.

Description

Technical Field

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

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

[0003] A battery consists of a battery casing and multiple battery cells housed within the casing. To reduce the risk of the battery cells shifting within the casing, pressure plates are typically installed on the end caps of the battery cells. However, there is a risk that the pressure plates may detach from the battery cells, affecting the battery's stability. Utility Model Content

[0004] In view of this, the present application provides a battery device and an electrical device that can reduce the risk of the pressure plate detaching from the battery cell and improve the stability of the battery device.

[0005] An embodiment of the first aspect of this application provides a battery device, comprising: a battery cell assembly including a plurality of battery cells, each battery cell including a housing, an end cap, and an electrode assembly housed within the housing, the housing having an opening on one side along a first direction, the end cap covering the opening, the end cap including an end cap body and a protruding structure, the protruding structure being disposed along the edge of the end cap body and protruding in a direction away from the electrode assembly; and a pressure plate, at least partially located on the side of the end cap away from the housing, the pressure plate being used to press against the end cap body along the first direction, the pressure plate and the protruding structure being spaced apart along the first direction.

[0006] In the battery device provided in this application embodiment, the pressure plate limits the position of the battery cell, reducing the risk of the battery cell shaking. At the same time, by setting the pressure plate and the protrusion at a distance, the pressure plate and the protrusion structure will not directly contact each other, avoiding the pressure plate pressing on the protrusion structure and causing local stress concentration, reducing the risk of the protrusion structure collapsing and cracking, and thus reducing the risk of the pressure plate separating from the battery cell. The pressure plate can play a stable limiting role for the battery cell, improving the stability of the battery device. At the same time, it also reduces the risk of sealing failure due to local cracking of the battery cell.

[0007] In some embodiments, the pressure plate has a recessed groove on the surface facing the battery cell, and a protruding structure is disposed opposite to the groove and is at least partially accommodated within the groove.

[0008] By adopting the above technical solution, the groove on the pressure plate can avoid the protruding structure, while the rest of the pressure plate can press against the end cap body. The pressure plate can play a good limiting role and is not easy to damage the protruding structure.

[0009] In some embodiments, the protruding structure is spaced apart from the bottom surface of the groove.

[0010] By adopting the above technical solution, the raised structure does not contact the bottom surface of the groove, the raised structure is not subjected to force, and the risk of the raised structure being crushed or cracked is not likely to occur.

[0011] In some embodiments, the depth of the groove is greater than the protrusion height of the protrusion structure.

[0012] By adopting the above technical solution, since the depth of the groove is greater than the protrusion height of the protrusion structure, it is possible to achieve a spacing between the bottom surface of the protrusion structure and the groove.

[0013] In some embodiments, the width of the groove is greater than the width of the protrusion, and the protrusion and the sidewall of the groove are spaced apart.

[0014] By adopting the above technical solution, the pressure plate does not come into contact with the side wall of the protruding structure, which further reduces the risk of damage to the protruding structure. In addition, the battery cell and the pressure plate can be easily assembled, resulting in a high yield rate.

[0015] In some embodiments, a plurality of battery cells are arranged along a second direction, and a pressure plate extends along the second direction and is able to press against the plurality of battery cells, wherein the second direction is perpendicular to the first direction.

[0016] By adopting the above technical solution, the pressure plate can limit the position of multiple battery cells arranged along the second direction, resulting in good structural stability of the battery device.

[0017] In some embodiments, the protrusion structure includes a first protrusion extending along a third direction, and the groove includes a first strip groove extending along a third direction. The first protrusion is disposed opposite to the first strip groove and is at least partially accommodated within the first strip groove. The third direction is perpendicular to the first direction and intersects with the second direction.

[0018] By adopting the above technical solution, the pressure plate can avoid the first protrusion in the strip shape provided on the end cap body through the first strip groove.

[0019] In some embodiments, the protrusion structure includes a second protrusion extending in a second direction, and the groove includes a second strip groove extending in a second direction. The second protrusion is disposed opposite to the second strip groove and is at least partially accommodated within the second strip groove.

[0020] By adopting the above technical solution, the pressure plate can avoid the second protrusion in the strip shape provided on the end cap body through the second strip groove.

[0021] In some embodiments, the pressure plate is provided with a plurality of grooves, which are spaced apart along a second direction; the grooves accommodate at least a portion of the protrusion structure on one of the battery cells, or, in two battery cells arranged adjacent to each other along the second direction, the adjacent edges of the two end cap bodies are provided with the protrusion structure, and the grooves simultaneously accommodate at least a portion of the protrusion structure on two adjacent battery cells.

[0022] By adopting the above technical solution, the pressure plate can avoid the protruding structures on multiple battery cells through multiple grooves, resulting in better structural stability of the battery device.

[0023] In some embodiments, the battery cell further includes a spacer located between the end cap body and the pressure plate.

[0024] By adopting the above technical solution, the spacer can separate the protruding structure from the pressure plate, thus solving the stress concentration problem caused by the pressure plate pressing directly on the protruding structure.

[0025] In some embodiments, along a first direction, the orthographic projection of the spacer toward the end cap falls within the end cap body.

[0026] By adopting the above technical solution, neither the spacer nor the pressure plate presses against the protruding structure along the first direction, and the spacer can protect the protruding structure.

[0027] In some embodiments, the thickness of the spacer is greater than the protrusion height of the protrusion structure.

[0028] By adopting the above technical solution, the pressure plate can achieve planar contact with the battery cell and spacer, thus solving the problem of stress concentration at the protruding structure.

[0029] In some embodiments, the spacer is an adhesive layer, and the pressure plate is bonded to the surface of the end cap assembly through the adhesive layer.

[0030] By adopting the above technical solution, the adhesive layer, as a spacer, not only prevents the pressure plate from contacting the top of the protruding structure, but also bonds and fixes the pressure plate to the end cover body, while reducing the risk of excessive expansion of the battery cell along the first direction.

[0031] In some embodiments, the protrusion height of the protrusion structure ranges from 0.05mm to 1.5mm, and the thickness of the adhesive layer ranges from 0.1mm to 3.5mm.

[0032] By setting the thickness of the adhesive layer to be greater than or equal to 0.1 mm, the adhesive layer can effectively separate the protruding structure from the pressure plate; by setting the thickness of the adhesive layer to be less than or equal to 3.5 mm, it is beneficial to save space and improve the energy density of the battery device.

[0033] In some embodiments, the spacer is an insulating patch that is attached to the surface of the end cap body.

[0034] By adopting the above technical solution, the insulating patch is located between the pressure plate and the end cap body, which can separate the protruding structure from the pressure plate and reduce the risk of the protruding structure collapsing and cracking.

[0035] In some embodiments, the protrusion structure is annular and arranged circumferentially along the end cap body, and the pressure plate and the portion of the protrusion structure opposite to the pressure plate are spaced apart along a first direction.

[0036] By adopting the above technical solution, an annular protrusion structure is set on the end cap body, which can reduce the molding difficulty of the end cap body and improve the life of the manufacturing mold; the pressure plate and the part of the protrusion structure directly opposite it are spaced apart, so the pressure plate is not easy to crush the protrusion structure or cause the protrusion structure to crack.

[0037] In some embodiments, the end cap body includes an end cap sheet, and the protruding structure is integrally formed with the end cap sheet. Embodiments of this application provide a spaced arrangement of the pressure plate and the protruding structure, which can adapt to the structure of the end cap assembly.

[0038] In some embodiments, the end cap is a steel cap or a titanium cap.

[0039] By adopting the above technical solution, the end cap is made of steel or titanium, which has high structural strength and is conducive to making the end cap thinner.

[0040] In some embodiments, the end cover is provided with a positioning groove on the side facing the housing, one end of the housing is positioned in the positioning groove, and the side of the end cover away from the housing forms the protrusion structure corresponding to the positioning groove; the weld mark formed by welding the end cover to the housing is located at least on the outer surfaces of the housing and the end cover.

[0041] By adopting the above technical solution, one end of the casing can be positioned and limited in the positioning groove to solve the problems of difficult positioning and poor welding between the end cover and the casing; furthermore, the end cover and the casing can be connected by side welding, so that the battery cell has better sealing reliability.

[0042] In some embodiments, the end cap has a thickness of 0.6 mm to 1.5 mm, and the housing has a thickness of 0.1 mm to 0.4 mm.

[0043] By adopting the above technical solution, both structural strength and energy density of the battery device can be taken into account.

[0044] An embodiment of the second aspect of this application provides an electrical device including the battery device provided in the first aspect, the battery device being used to provide electrical energy.

[0045] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, specific embodiments of this application are given below. Attached Figure Description

[0046] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0047] Figure 1 This is a schematic diagram of the structure of a vehicle provided in one embodiment of this application;

[0048] Figure 2 This is a schematic diagram of the structure of a battery device provided in an embodiment of this application;

[0049] Figure 3 This is a top view of a battery cell and pressure plate provided in an embodiment of this application;

[0050] Figure 4 This is a three-dimensional schematic diagram of a battery cell provided in an embodiment of this application;

[0051] Figure 5 for Figure 4 A three-dimensional exploded view of the battery cell shown.

[0052] Figure 6 for Figure 5 Enlarged view of part B in the middle;

[0053] Figure 7 For along Figure 3 A partial sectional view of line AA in the middle;

[0054] Figure 8 for Figure 7 Enlarged view of a section in the middle C;

[0055] Figure 9 In another embodiment, along Figure 3 A partial sectional view of line AA in the middle;

[0056] Figure 10 for Figure 9 A magnified view of a section in part D;

[0057] Figure 11 In another embodiment, along Figure 3 A partial sectional view of line AA in the middle;

[0058] The markings in the diagram mean:

[0059] 1000, Vehicle; 100, Battery Unit; 200, Controller; 300, Motor; 10, Housing; 11, Upper Housing; 12, Lower Housing; 20, Battery Cell Assembly; 21, Battery Cell; 211, Housing; 2111, Opening; 212, End Cap; 2121, End Cap Body; 21211, End Cap Piece; 21212, Insulating Component; 2122, Protruding Structure; 21221, First Protrusion; 21222, Second Protrusion; 2123, Positioning Groove; 213, Electrode Assembly; 214, Electrode Terminal; 215, Pressure Relief Mechanism; 30, Pressure Plate; 31, Groove; 31a, First Strip Groove; 311, Groove Bottom Surface; 312, Side Wall; 40, Spacer; 40a, Adhesive Layer; 40b, Insulating Patch. Detailed Implementation

[0060] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0061] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0062] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0063] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0064] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0065] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), and similarly, "multiple groups" refers to two or more (including two groups).

[0066] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0067] 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.

[0068] 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.

[0069] The battery apparatus mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells connected in series, parallel, or mixed connections via a busbar.

[0070] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0071] 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.

[0072] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cells housed within the housing.

[0073] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0074] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0075] In recent years, new energy vehicles have experienced rapid development. In the field of electric vehicles, batteries, as the power source, play an irreplaceable and crucial role. Among these, batteries, as a core component of new energy vehicles, have high requirements in terms of reliability.

[0076] Batteries typically consist of a casing and multiple battery cells housed within it. To reduce the risk of battery cells shifting within the casing, pressure plates are usually installed on the end caps of the battery cells. Currently, some battery cell end caps have protruding structures. When the pressure plate presses against these protruding structures, it can easily cause the protruding structures to collapse and crack, allowing the pressure plate to detach from the battery cell. This weakens the pressure plate's restraining effect on the battery cell and may even affect the sealing of the battery cell due to localized cracking, thus impacting the battery's stability.

[0077] Therefore, this application provides a battery device including a battery cell assembly and a pressure plate. The battery cell assembly includes multiple battery cells, and each battery cell includes a housing, an end cap, and an electrode assembly. The housing has an opening on one side along a first direction, and the end cap closes to the opening. The end cap includes an end cap body and a protruding structure on the edge of the end cap body, the protruding structure protruding in a direction away from the electrode assembly. The pressure plate is at least partially located on the side of the end cap away from the housing, and the pressure plate is used to press against the end cap body along the first direction. The pressure plate and the protruding structure are spaced apart along the first direction.

[0078] In the solution provided in this application embodiment, the pressure plate limits the position of the battery cell, reducing the risk of the battery cell shaking. At the same time, by setting the pressure plate and the protrusion at a distance, the pressure plate and the protrusion structure will not directly contact each other in the first direction, avoiding local stress concentration caused by the pressure plate pressing on the protrusion structure, reducing the risk of the protrusion structure collapsing and cracking, and thus reducing the risk of the pressure plate separating from the battery cell. The pressure plate can play a stable limiting role for the battery cell, improving the stability of the battery device. At the same time, it also reduces the risk of sealing failure due to local cracking of the battery cell.

[0079] 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. For ease of explanation, the following embodiments use a vehicle as an example of an electrical device according to an embodiment of this application.

[0080] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100 is provided inside the vehicle 1000, and the battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

[0081] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0082] Please refer to Figures 2 to 4 The battery device 100 includes a housing 10 and a battery cell assembly 20. The housing 10 includes an upper housing 11 and a lower housing 12, which overlap each other, defining a space for accommodating the battery cells 21. The lower housing 12 can be a hollow structure with one open end, and the upper housing 11 can be a plate-like structure, covering the open side of the lower housing 12 so that the upper housing 11 and the lower housing 12 together define the accommodating space. Alternatively, the upper housing 11 and the lower housing 12 can both be hollow structures with one open end, with the open side of the upper housing 11 covering the open side of the lower housing 12. Of course, the housing 10 formed by the upper housing 11 and the lower housing 12 can be of various shapes, such as a cylinder or a cuboid.

[0083] A battery cell assembly 20 is typically formed by arranging multiple battery cells 21. The battery cell 21 is the smallest unit that makes up the battery device 100, and the battery cell 21 includes a housing 211, an end cap 212, an electrode assembly 213, and other functional components.

[0084] End cap 212 refers to a component that covers the opening of housing 211 to isolate the internal environment of battery cell 21 from the external environment. The shape of end cap 212 can be adapted to the shape of housing 211 to fit it. Optionally, end cap 212 can be made of a material with certain hardness and strength (such as aluminum alloy), so that end cap 212 is not easily deformed under pressure and impact, giving battery cell 21 higher structural strength and improved reliability. Functional components such as electrode terminals 214 and pressure relief mechanism 215 can be provided on end cap 212. Electrode terminals 214 can be used for electrical connection with electrode assembly 213 for outputting or inputting electrical energy to battery cell 21. In some embodiments, pressure relief mechanism 215 is used to release internal pressure when the internal pressure or temperature of battery cell 21 reaches a threshold. The material of end cap 212 can also be various, such as copper, iron, aluminum, stainless steel, titanium, aluminum alloy, plastic, etc., and this application embodiment does not impose any special limitations on this. In some embodiments, an insulating element may also be provided on the inner side of the end cap 212 to reduce the risk of short circuit. For example, the insulating element may be made of plastic, rubber, etc.

[0085] The housing 211 is a component used to cooperate with the end cap 212 to form the internal environment of the battery cell 21. This internal environment can accommodate the electrode assembly 213, electrolyte, and other components. The housing 211 and the end cap 212 can be independent components. An opening can be provided on the housing 211, and the end cap 212 can be used to close the opening to form the internal environment of the battery cell 21. Alternatively, the end cap 212 and the housing 211 can be integrated. Specifically, the end cap 212 and the housing 211 can form a common connecting surface before other components are inserted into the housing. When it is necessary to encapsulate the interior of the housing 211, the end cap 212 closes the housing 211. The housing 211 can have various shapes and sizes, such as cuboid, cylindrical, or hexagonal prism. Specifically, the shape of the housing 211 can be determined according to the specific shape and size of the electrode assembly 213. The shell 211 can be made of various materials, such as copper, iron, aluminum, stainless steel, titanium, aluminum alloy, plastic, etc. This application embodiment does not impose any special restrictions on this.

[0086] Electrode assembly 213 is the component in the battery cell 21 where the electrochemical reaction occurs. The housing 211 may contain one or more electrode assemblies 213. The electrode assembly 213 is mainly formed by winding or stacking positive and negative electrode sheets, and typically a separator is provided between the positive and negative electrode sheets. The portions of the positive and negative electrode sheets containing active material constitute the end cap body of the electrode assembly 213, while the portions of the positive and negative electrode sheets without active material each constitute a tab. The positive and negative tabs may be located together at one end of the end cap body or at opposite ends of the end cap body. During the charging and discharging process of the battery device 100, the positive and negative active materials react with the electrolyte, and the tabs connect to the electrode terminals 214 to form a current loop. In some embodiments, a pressure relief mechanism 215 is provided on one side of the battery cell 21. The pressure relief mechanism 215 is an element or component that is actuated to release internal pressure when the internal pressure or temperature of the battery cell 21 reaches a predetermined threshold.

[0087] Please refer to Figures 2 to 7 An embodiment of the first aspect of this application provides a battery device 100, including a battery cell assembly 20 and a pressure plate 30. The battery cell assembly 20 includes a plurality of battery cells 21. Each battery cell 21 includes a housing 211, an end cap 212, and an electrode assembly 213 housed within the housing 211. The housing 211 has an opening 2111 on one side along a first direction Z. The end cap 212 covers the opening 2111. The end cap 212 includes an end cap body 2121 and a protrusion structure 2122. The protrusion structure 2122 is disposed along the edge of the end cap body 2121 and protrudes in a direction away from the electrode assembly 213. The pressure plate 30 is at least partially located on the side of the end cap 212 away from the housing 211. The pressure plate 30 is used to press against the end cap body 2121 along the first direction Z. The pressure plate 30 and the protrusion structure 2122 are spaced apart along the first direction Z.

[0088] The first direction Z is the height direction of the battery cell 21, and it is also the arrangement direction of the end cap 212 and the casing 211.

[0089] The battery cell assembly 20 includes a plurality of battery cells 21. For example, the battery cell assembly 20 includes a plurality of battery cells 21 arranged sequentially along a second direction X. Multiple sets of battery cell assemblies 20 are arranged sequentially along a third direction Y, such that the battery cells 21 are arranged in an array, and the third direction Y intersects with the second direction X. Optionally, the second direction X may be the length direction of the housing 10, and the third direction Y may be the width direction of the housing 10; in other embodiments, the second direction X and / or the third direction Y may also intersect the length direction of the housing 10 at an angle.

[0090] The battery cell 21 includes a housing 211, an end cap 212, and an electrode assembly 213 housed within the housing 211. The housing 211 has an opening 2111 on one side along the first direction Z, and the end cap 212 covers the opening 2111, that is, the end cap 212 is located on one side of the housing 211 along the first direction Z.

[0091] The end cap 212 includes an end cap body 212 and a protruding structure 2122. The protruding structure 2122 may be provided on at least one edge of the end cap body 212, and the protruding structure 2122 protrudes in a direction away from the electrode assembly 213. There may be various reasons for forming the protruding structure 2122. For example, during manufacturing, the protruding structure 2122 can be formed on the edge of the end cap body 212 by die stamping, which facilitates forming and can improve the life of the die.

[0092] The pressure plate 30 is at least partially disposed on the side of the end cover 212 away from the housing 211. For example, the entire pressure plate 30 is located on the side of the end cover 212 away from the housing 211. In other embodiments, a portion of the pressure plate 30 is disposed on the side of the end cover 212 away from the housing 211.

[0093] The pressure plate 30 is used to press the end cap body 2121 along the first direction Z, and then press the battery cell 21. Thus, the pressure plate 30 can limit the battery cell 21, reduce the risk of the battery cell 21 shaking, and reduce the risk of electrical connection failure and other defects caused by the shaking of the battery cell 21.

[0094] It should be noted that the pressure plate 30 presses against the end cap body 2121 along the first direction Z. This can be either the pressure plate 30 directly contacts and presses against the end cap body 2121, or the pressure plate 30 indirectly presses against the end cap body 2121. That is, the pressure plate 30 and the end cap body 2121 may also be provided with other film layers or components. For example, blue glue or a top patch may be provided between the pressure plate 30 and the end cap body 2121.

[0095] The pressure plate 30 may include insulating materials, such as non-metallic materials like rubber. Since the pressure plate 30 is close to the conductive structure (busbar, electrode terminal 214, etc.) of the battery cell 21, the insulation of the pressure plate 30 can reduce the short-circuit risk of the battery device 100.

[0096] The pressure plate 30 is disposed opposite to the end cover body 212. The pressure plate 30 can be fixedly connected to the end cover body 212, or the pressure plate 30 can simply abut against the end cover body 212. There is no need for a fixed connection between the two, as long as the pressure plate 30 can press against the battery cell 21 along the first direction Z.

[0097] The pressure plate 30 and the protruding structure 2122 are spaced apart along the first direction Z, that is, along the first direction Z, the pressure plate 30 does not contact the top end of the protruding structure 2122, and the top end of the protruding structure 2122 is the end of the protruding structure 2122 that is away from the end cap body 212. The top surface of the protruding structure 2122 can be a plane, a slope, a chamfered surface, etc.

[0098] The pressure plate 30 can contact the end cap body 212 while avoiding the protruding structure 2122, or the pressure plate 30 can avoid contact with both the end cap body 2122 and the protruding structure 2122. By spaced the pressure plate 30 from the protruding structure 2122, stress concentration caused by the pressure plate 30 pressing on the protruding structure 2122 can be avoided, reducing the risk of the protruding structure 2122 collapsing and cracking. Since the pressure plate 30 is less likely to collapse the protruding structure 2122, the pressure plate 30 can maintain contact with the battery cell 21, solving the risk of the pressure plate 30 detaching from the battery cell 21, improving the connection strength, and enhancing the reliability and stability of the battery device 100. Because the pressure plate 30 is stably in contact with the battery cell 21, the battery cell 21 is less likely to shake or vibrate, which is beneficial for the stable electrical connection between the electrode terminal 214 and the conductive structure.

[0099] In the battery device 100 provided in this application embodiment, the pressure plate 30 limits the battery cell 21, reducing the risk of the battery cell 21 shaking. By spaced apart from the protruding structure 2122, the pressure plate 30 and the top of the protruding structure 2122 do not directly contact each other, avoiding local stress concentration caused by the pressure plate 30 pressing on the protruding structure 2122, reducing the risk of the protruding structure 2122 collapsing and cracking, and thus reducing the risk of the pressure plate 30 detaching from the battery cell 21. The pressure plate 30 can provide a stable limiting effect on the battery cell 21, improving the stability of the battery device 100. At the same time, it also reduces the risk of sealing failure of the battery cell 21 due to local cracking.

[0100] Please refer to Figure 3 , Figure 7 and Figure 8 In some embodiments, the pressure plate 30 has a recessed groove 31 on the surface facing the battery cell 21, and the protrusion structure 2122 is disposed opposite to the groove 31 and is at least partially accommodated in the groove 31.

[0101] The surface of the pressure plate 30 facing the battery cell 21 is used to press against the end cap 212 of the battery cell 21, and this surface is recessed with a groove 31. Optionally, such as Figure 7 and Figure 8 As shown, in some embodiments, the area of ​​the surface other than the groove 31 may be planar to facilitate pressing against the battery cell 21. It can be understood that the surface may also be adapted to the surface of the end cap 212.

[0102] The groove 31 is disposed opposite to the protruding structure 2122 to accommodate at least a portion of the protruding structure 2122, and the groove 31 serves to avoid the protruding structure 2122. The groove 31 may have the same shape as the protruding structure 2122. For example, if the protruding structure 2122 is strip-shaped, then the groove 31 may also be strip-shaped. It is understood that the groove 31 may also have a different shape from the protruding structure 2122, as long as the groove 31 can accommodate the corresponding portion of the protruding structure 2122.

[0103] By providing a groove 31 on the surface of the pressure plate 30 facing the battery cell 21, the groove 31 can accommodate at least part of the protrusion structure 2122, and the rest of the pressure plate 30 can press against the battery cell 21. In this way, the pressure plate 30 avoids at least part of the protrusion structure 2122 through the groove 31, while the rest of the pressure plate 30 can press against the end cap body 212. The pressure plate 30 can play a good limiting role and is not easy to damage the protrusion structure 2122.

[0104] In some embodiments, the protrusion structure 2122 and the groove bottom surface 311 of the groove 31 are spaced apart.

[0105] like Figure 7 and Figure 8 As shown, the bottom surface 311 of the groove 31 is located at the bottom of the groove 31 along the first direction Z. The protruding structure 2122 is spaced apart from the bottom surface 311 of the groove 31, which allows the pressure plate 30 and the protruding structure 2122 to be spaced apart, thus avoiding stress concentration.

[0106] By adopting the above technical solution, the protruding structure 2122 does not contact the bottom surface 311 of the groove 31, the protruding structure 2122 is not subjected to force, and the risk of the protruding structure 2122 being crushed or cracked is not likely to occur.

[0107] In other embodiments, cushioning elements such as buffer foam can be provided in the groove 31 to protect the protruding structure 2122.

[0108] like Figure 7 and Figure 8 As shown, in some embodiments, the depth H2 of the groove 31 is greater than the protrusion height H1 of the protrusion structure 2122.

[0109] The depth of the groove 31 refers to the depth of the groove 31 along the first direction Z, and the protrusion height of the protrusion structure 2122 refers to the height of the protrusion structure 2122 extending beyond the end cap body 2121 along the first direction Z.

[0110] The surface of the pressure plate 30 can be attached to the end cap body 212, and the protruding structure 2122 is accommodated in the groove 31. Since the depth of the groove 31 is greater than the height of the protruding structure 2122, the protruding structure 2122 and the bottom surface 311 of the groove 31 can be spaced apart.

[0111] In other embodiments, the surface of the end cap body 212 is provided with spacers 40 such as top cap patch and adhesive layer, so the depth of the groove 31 can be less than or equal to the height of the protrusion structure 2122.

[0112] Please continue to refer to Figures 6 to 8 In some embodiments, the width W2 of the groove 31 is greater than the width W1 of the protrusion 2122, and the protrusion 2122 is spaced apart from the sidewall 312 of the groove 31.

[0113] The width direction of the groove 31 is the same as the width direction of the protrusion 2122, both being perpendicular to the first direction Z. In this embodiment, the width direction of the groove 31 and the width direction of the protrusion 2122 are the second direction X.

[0114] In some embodiments, the width of the protrusion 2122 is 0.05mm-1.0mm. The protrusion 2122 is typically formed by stamping and has a small width; optionally, the width of the groove 31 is greater than 0.1mm to facilitate assembly.

[0115] By setting the width of the groove 31 to be greater than the width of the protrusion 2122, the protrusion 2122 can be kept out of contact with the sidewall 312 of the groove 31, further reducing the risk of damage to the protrusion 2122. In addition, the battery cell 21 and the pressure plate 30 can be easily assembled, resulting in a high yield.

[0116] Please refer to Figure 3 and Figure 4 In some embodiments, a plurality of battery cells 21 are arranged along a second direction X, and a pressure plate 30 extends along the second direction X and is able to press against the plurality of battery cells 21, wherein the second direction X is perpendicular to the first direction Z.

[0117] The battery cell assembly 20 includes a plurality of battery cells 21 arranged sequentially along a second direction X. A pressure plate 30 extends along the second direction X, meaning that the pressure plate 30 can span across the plurality of battery cells 21 to simultaneously press against the plurality of battery cells 21. Optionally, the pressure plate 30 may be a strip plate.

[0118] In some embodiments, the battery device 100 includes a housing 10, and the housing 10 includes a pair of crossbeams arranged along a second direction X. Both ends of a pressure plate 30 are respectively fixed to the two crossbeams, so that the pressure plate 30 can simultaneously press against a row of battery cells 21 arranged along the second direction X. It is understood that the pressure plate 30 can also be fixed in other ways, such as fixing one end of the pressure plate 30 to a crossbeam in the middle of the housing 10 or fixing the pressure plate 30 to an upper housing.

[0119] In a plurality of battery cells 21 arranged along the second direction X, one or more battery cells 21 have a protruding structure 2122 on their end caps 212. Since the pressure plate 30 can press against the plurality of battery cells 21, the pressure plate 30 can be spaced apart from the protruding structure 2122 on each battery cell 21.

[0120] By adopting the above technical solution, the pressure plate 30 can limit the multiple battery cells 21 arranged along the second direction X, and the battery device 100 has good structural stability.

[0121] Please refer to Figures 5 to 8 In some embodiments, the protrusion structure 2122 includes a first protrusion 21221 extending along a third direction Y, and the groove 31 includes a first strip groove 311 extending along a third direction Y. The first protrusion 21221 is disposed opposite to the first strip groove 311 and is at least partially accommodated in the first strip groove 311. The third direction Y is perpendicular to the first direction Z and intersects the second direction X.

[0122] The third direction Y is the length direction of the battery cell 21. The first protrusion 21221 is provided on the edge of the end cap body 212 and extends along the length direction of the battery cell 21. Since the pressure plate 30 extends along the second direction X and spans the battery cell 21, in order to avoid the protrusion structure 2122, the groove 31 includes a first strip groove 311 extending along the third direction Y, so that the first strip groove 311 is adapted to the first protrusion 21221, and the remaining area of ​​the pressure plate 30 can still resist the battery cell 21.

[0123] Optionally, if the first groove 311 passes through the opposite ends of the pressure plate 30 along the third direction Y, then the first protrusion 21221 can be completely accommodated in the first groove 311 so that the pressure plate 31 can avoid the first protrusion 21221.

[0124] Optionally, the protrusion structure 2122 includes two first protrusions 21221, which are respectively disposed on both sides of the battery cell 21 along the second direction X. Correspondingly, the area of ​​the pressure plate 30 opposite to the battery cell 21 is provided with two first strip grooves 311, which respectively accommodate the two first protrusions 21221.

[0125] Optionally, the protrusion structure 2122 may also include two second protrusions 21222, which are respectively disposed on both sides of the battery cell 21 along the third direction Y.

[0126] In this embodiment, the end cap 212 is provided with two electrode terminals 214, and the pressure plate 30 is located between the two electrode terminals 214, that is, the pressure plate 30 does not cover the second protrusion 21222; it can be understood that if the pressure plate 30 covers the second protrusion 21222, a second strip groove for accommodating the second protrusion 21222 can also be provided on the pressure plate 30.

[0127] By adopting the above technical solution, the pressure plate 30 provided in this application embodiment can avoid the strip-shaped first protrusion 21221 provided on the end cap body 212.

[0128] In some embodiments, the protrusion structure 2122 includes a second protrusion 21222 extending along the second direction X, and the groove 31 includes a second strip-shaped groove (not shown) extending along the second direction X. The portion of the second protrusion 21222 opposite to the pressure plate 30 is accommodated in the second strip-shaped groove. In this way, the pressure plate 30 can avoid the strip-shaped second protrusion 21222 extending along the second direction X.

[0129] By adopting the above technical solution, the pressure plate 30 provided in this application embodiment can avoid the strip-shaped second protrusion 21222 provided on the end cap body 212.

[0130] Optionally, two rows of battery cells 21 are arranged adjacent to each other along the third direction Y. A pressure plate 30 is disposed between the two battery cells 21 arranged adjacent to each other along the third direction Y. The pressure plate 30 covers two adjacent second protrusions 21222 on the two battery cells 21. In this case, the pressure plate 30 can simultaneously abut against the two rows of battery cells 21 and avoid the second protrusions 21222 through the second strip groove.

[0131] Optionally, the groove 31 includes a second strip groove extending along the second direction X and a first strip groove 311 extending along the third direction Y, respectively accommodating the corresponding second protrusion 21222 and the first protrusion 21211.

[0132] It is understandable that the position of the pressure plate 30 can be flexibly set.

[0133] In some embodiments, the pressure plate 30 is provided with a plurality of grooves 31, which are spaced apart along the second direction X; wherein, the grooves 31 accommodate at least a portion of the protrusions 2122 on a battery cell 21, or, in two battery cells 21 arranged adjacent to each other along the second direction X, the adjacent edges of the two end cap bodies 2121 are provided with protrusions 2122, and the grooves 31 simultaneously accommodate at least a portion of the protrusions 2122 on the two adjacent battery cells 21.

[0134] Optionally, each first groove 311 is disposed opposite to a first protrusion 21221 to accommodate the first protrusion 21221.

[0135] Optionally, the groove 31 can also accommodate the first protrusions 21221 on two adjacent battery cells 21. Since multiple battery cells 21 are arranged sequentially along the second direction X, any two adjacent battery cells 21 abut against each other, and the first protrusions 21221 on the two adjacent battery cells 21 are also arranged adjacently. Thus, a first strip groove 311 can be arranged directly opposite to the first protrusions 21221 on the two battery cells 21. By setting the groove 31 to accommodate the protrusions 2122 on two adjacent battery cells 21, the number of grooves 31 can be reduced, and the manufacturing difficulty of the pressure plate 30 can be reduced.

[0136] By adopting the above technical solution, the pressure plate 30 can avoid the protrusions 2122 on multiple battery cells 21 through multiple grooves 31, and the structural stability of the battery device 100 is better.

[0137] Please refer to Figure 9 , Figure 10 The battery cell 21 also includes a spacer 40, which is located between the end cap body 212 and the pressure plate 30. The spacer 40 can separate the protruding structure 2122 from the pressure plate 30.

[0138] The spacer 40 is fixed to the end cap body 212. Optionally, the spacer 40 does not cover the protruding structure 2122.

[0139] The pressure plate 30 is connected to the spacer 40, and the pressure plate 30 can press against the spacer 40 to press against the battery cell 21 in the first direction Z. The pressure plate 30 can be fixedly connected to the spacer 40, or it can be connected by abutting.

[0140] By adopting the above technical solution, the pressure plate 30 presses against the end cap 212 of the battery cell 21 through the spacer 40. The spacer 40 can separate the protruding structure 2122 from the pressure plate 30, which solves the stress concentration problem caused by the pressure plate 30 pressing directly on the protruding structure 2122. Therefore, the spacer 40 can protect the protruding structure 2122 and reduce the risk of the protruding structure 2122 collapsing and cracking.

[0141] In some embodiments, along the first direction Z, the orthographic projection of the spacer 40 toward the end cap 212 falls within the end cap body 2121.

[0142] Along the first direction Z, the orthographic projection of the spacer 40 toward the end cap 212 falls within the end cap body 2121, meaning the spacer 40 and the end cap body 2121 are directly opposite each other. Along the first direction Z, neither the spacer 40 nor the pressure plate 30 presses against the protruding structure 2122, and the spacer 40 does not cover the protruding structure 2122, thus preventing stress concentration on the protruding structure 2122.

[0143] In some embodiments, the thickness of the spacer 40 is greater than the protrusion height of the protrusion structure 2122.

[0144] The thickness of the spacer 40 is greater than the protrusion height of the protrusion structure 2122 on the end cap body 2121, so that the spacer 40 can be sandwiched between the end cap body 2121 and the pressure plate 30, and the spacer 40 can make the pressure plate 30 and the protrusion structure 2122 spaced apart.

[0145] By adopting the above technical solution, the pressure plate 30 can achieve planar contact with the battery cell 21 and the spacer 40, thus solving the problem of stress concentration at the protruding structure 2122.

[0146] like Figure 10 As shown, in some embodiments, the spacer 40 is an adhesive layer 40a, and the pressure plate 30 is bonded to the surface of the end cap 212 through the adhesive layer 40a.

[0147] The adhesive layer 40a can be a cured colloid or an adhesive tape. The adhesive layer 40a serves to bond the pressure plate 30 and the end cap body 212, making the pressure plate 30 more secure and preventing the pressure plate 30 from shaking and hitting the electrode terminal 214, thereby enabling the electrode terminal 214 to be stably electrically connected to the conductive structure.

[0148] Optionally, the adhesive layer 40a is located on the surface of the end cap body 212, and the adhesive layer 40a does not cover the protrusion structure 2122. Along the first direction Z, the height of the adhesive layer 40a is greater than the height of the protrusion structure 2122.

[0149] By adopting the above technical solution, the adhesive layer 40a, as a spacer 40, not only prevents the pressure plate 30 from contacting the top of the protruding structure 2122, but also bonds and fixes the pressure plate 30 to the end cover body 212, thereby improving the connection reliability between the pressure plate 30 and the battery cell 21, reducing the risk of the battery cell 21 shaking, and reducing the risk of the battery cell 21 over-expanding along the first direction Z.

[0150] In addition, the pressure plate 30 is bonded to multiple battery cells 21 by the adhesive layer 40a, so the pressure plate 30 and multiple battery cells 21 form a whole, which helps to improve the structural strength and structural stability of multiple battery cells 21 in the box, thereby effectively improving the stability of the battery device in use.

[0151] In some embodiments, the protrusion height of the protrusion structure 2122 is 0.05mm-1.5mm, and the thickness of the adhesive layer 40a is 0.1mm-3.5mm.

[0152] Figure 10The thickness H3 of the adhesive layer 40a is illustrated. The protrusion height of the protrusion structure 2122 can be 0.05mm, 0.1mm, 0.5mm, 1.0mm, 1.5mm, etc., and the thickness of the adhesive layer 40a can be 0.1mm, 1mm, 2mm, 3mm, 3.5mm, etc., and the thickness of the adhesive layer 40a is greater than the protrusion height of the protrusion structure 2122.

[0153] By setting the thickness of the adhesive layer 40a to be greater than or equal to 0.1 mm, the adhesive layer 40a can effectively separate the protruding structure 2122 from the pressure plate 30; by setting the thickness of the adhesive layer 40a to be less than or equal to 3.5 mm, it is beneficial to save space and increase the energy density of the battery device 100.

[0154] Please refer to Figure 11 In some embodiments, the spacer 40 is an insulating patch 40b, which is attached to the surface of the end cap body 2121.

[0155] The insulating patch 40b is a sheet made of insulating material and can also be called a top cover patch. The insulating patch 40b can be fixed to the surface of the end cover body 2121 with adhesive, providing insulation and protection. Simultaneously, the insulating patch is located between the pressure plate 30 and the end cover body 2121, separating the raised structure 2122 from the pressure plate 30 and reducing the risk of collapse and cracking of the raised structure 2122.

[0156] Optionally, an insulating patch 40b covers the surface of the end cap body 2121, and the insulating patch 40b has several functional holes to expose components such as electrode terminals 214. The insulating patch 40b may also have adhesive holes to expose the adhesive applied to the end cap body 2121, and the adhesive can pass through the adhesive holes to connect the pressure plate 30 and the battery cell 21.

[0157] It is understandable that the thickness of the insulating patch 40b is greater than the protrusion height of the raised structure 2122.

[0158] In some embodiments, the protrusion structure 2122 is annular and is arranged circumferentially along the end cap body 212, and the pressure plate 30 and the portion of the protrusion structure 2122 opposite to the pressure plate 30 are spaced apart along the first direction Z.

[0159] The protruding structure 2122 is annular and arranged along the circumferential edge of the end cap body 212. When the end cap body 212 is circular, the protruding structure 2122 is annular; when the end cap body 212 is square, the protruding structure 2122 is square annular. In this embodiment, the protruding structure 2122 includes two first protrusions 21221 and two second protrusions 21222 arranged opposite each other along the second direction X. The first protrusions 21221 and the second protrusions 21222 are connected, and the protruding structure 2122 is a closed ring. The pressure plate 30 is directly opposite to a portion of the first protrusions 21221 and spaced apart along the first direction Z.

[0160] Optionally, the housing 211 is welded to the end cap 212. By setting the protrusion structure 2122 as annular, the protrusion structure 2122 can also be welded to the housing 211, thereby improving the connection strength and sealing reliability.

[0161] By setting an annular protrusion 2122 on the end cap body 212, the molding difficulty of the end cap body 212 can be reduced and the life of the manufacturing mold can be improved; the pressure plate 30 and the part of the protrusion 2122 opposite to it are spaced apart, so the pressure plate 30 is not easy to crush the protrusion 2122 or cause the protrusion 2122 to crack, the sealing reliability of the battery cell 21 is better, and the pressure plate 30 can maintain contact with the battery cell 21, so the battery cell 21 is not easy to shake.

[0162] In other embodiments, the protrusion structure 2122 may also include a plurality of discontinuous protrusions.

[0163] In some embodiments, the end cap body 2121 includes an end cap piece 21211, and the protruding structure 2122 is integrally formed with the end cap piece 21211.

[0164] The end cap body 212 may also include an insulating member 21212 connected to the end cap piece 21211. The insulating member 21212 is located on the side of the end cap piece 21211 near the electrode assembly 213 and serves as insulation.

[0165] The protruding structure 2122 and the end cover 21211 are integrally formed. In this embodiment of the application, the pressure plate 30 and the protruding structure 2122 are spaced apart, which can adapt to the structure of the end cover 212.

[0166] In some embodiments, the end cap piece 21211 in the end cap 212 is a steel cap or a titanium cap.

[0167] Compared to end caps 21211 which are made of aluminum or other materials, end caps 21211 are made of steel or titanium, which has higher structural strength and makes it easier to manufacture end caps 21211 with a thinner thickness.

[0168] In some embodiments, the housing 211 may also be a steel housing or a titanium housing.

[0169] In some embodiments, the end cover 21211 has a positioning groove 2123 on the side facing the housing 211, one end of the housing 211 is positioned in the positioning groove 2123, and the side of the end cover 21211 away from the housing 211 forms a protrusion structure 2122 corresponding to the positioning groove 2123; the weld mark formed by welding the end cover 21211 and the housing 211 is located at least on the outer surface of the housing 211 and the end cover 21211.

[0170] The positioning groove 2123 can be formed on the end cover piece 21211 by stamping. Based on the forming of the positioning groove 2123, the end cover piece 21211 on the side away from the housing 211 can form a protruding structure 2122 corresponding to the positioning groove 2123.

[0171] The positioning groove 2123 extends along the periphery of the end cover 21211, and the positioning groove 2123 may be arranged in a ring shape. Correspondingly, the protruding structure 2122 is also arranged in a ring shape. In other embodiments, the positioning groove 2123 may also be divided into two opposing strip grooves, so that the protruding structure is also divided into two opposing protruding strips.

[0172] The end cap 21211 and the housing 211 are welded together to achieve a fixed and sealed connection. The welding can be performed using, but is not limited to, laser welding, ultrasonic welding, etc.

[0173] Since one end of the housing 211 is positioned in the positioning groove 2123 of the end cover 21211, during welding, there is no need to use top welding; instead, side welding is used, welding is performed from the side of the end cover 21211 and the housing 211. The weld mark formed by the welding is located at least on the outer surface of the housing 211 and the end cover 21211. Optionally, the weld mark can also be partially located on the protruding structure 2122, further improving the welding area and welding reliability.

[0174] By adopting the above technical solution, the end cover 21211 is provided with a positioning groove 2123 on the side facing the housing 211, and one end of the housing 211 can be positioned and limited in the positioning groove 2123 to solve the problems of difficult positioning and poor welding between the end cover 21211 and the housing 211; furthermore, the end cover 21211 and the housing 211 can be connected by side welding, which enables the battery cell 21 to have better sealing reliability.

[0175] In some embodiments, the end cap 21211 has a thickness of 0.6mm-1.5mm, and the housing 211 has a thickness of 0.1mm-0.4mm.

[0176] Optionally, the end cap 21211 provided in this application embodiment is a steel cap or a titanium cap. Compared with aluminum end caps, the end cap 21211 has higher structural strength and can be made to have a thinner thickness.

[0177] The thickness of the end cover 21211 can be 0.6mm, 0.7mm, 0.8mm, 1.0mm, 1.2mm, 1.5mm, etc. By setting the thickness of the end cover 21211 to be greater than or equal to 0.6mm, the end cover 21211 can have better structural strength, reducing the risk of deformation. By setting the thickness of the end cover 21211 to be less than or equal to 1.5mm, the end cover 21211 can occupy less space and have less weight, which is beneficial to improving the energy density of the battery device. Optionally, the thickness of the end cover 21211 can be 0.7mm-1.2mm.

[0178] The thickness of the shell 211 is the wall thickness of the shell 211. The thickness of the shell 211 can be 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, etc.

[0179] By setting the thickness of the housing 211 to be greater than or equal to 0.1 mm, the housing 211 can have a certain thickness, reducing the risk of cracking due to the expansion of the electrode assembly and improving the reliability of the battery cell 21. By setting the thickness of the housing 211 to be less than or equal to 0.4 mm, the housing 211 can occupy less space and weigh less, which is beneficial to improving the energy density of the battery device. Optionally, the thickness of the housing 211 can be 0.15 mm to 0.35 mm.

[0180] By setting the thickness of the end cap 21211 and the housing 211 to meet the above conditions, both structural strength and energy density of the battery device can be taken into account.

[0181] Please refer to Figures 2 to 11 This application provides a battery device 100, including a battery cell assembly 20 and a pressure plate 30. The battery cell assembly 20 includes a plurality of battery cells 21 arranged along a second direction X. The pressure plate 30 extends along the second direction X and presses against the plurality of battery cells 21. The battery cell 21 includes a housing 211, an end cap 212 and an electrode assembly 213. The end cap 212 includes an end cap body 212 and a protrusion structure 2122. The protrusion structure 2122 is disposed along the edge of the end cap body 212 and protrudes in a direction away from the electrode assembly 213. The pressure plate 30 is spaced apart from the protrusion structure 2122 and can press against the end cap body 212 along a first direction Z.

[0182] In some embodiments, the pressure plate 30 has a recessed groove 31 on the surface facing the battery cell 21, and the protrusion structure 2122 is disposed opposite to the groove 31 and is at least partially accommodated in the groove 31; in other embodiments, the battery cell 21 further includes a spacer 40, which is disposed between the pressure plate 30 and the end cap body 2121, and the spacer 40 can separate the protrusion structure 2122 from the pressure plate 30.

[0183] An embodiment of the second aspect of this application provides an electrical device including a battery device 100 as provided in the first aspect, the battery device 100 being used to provide electrical energy.

[0184] The power supply device can be any of the aforementioned devices or systems that utilize battery device 100.

[0185] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A battery device, characterized by, The battery cell assembly comprises a plurality of battery cells, each of which comprises a shell, an end cap and an electrode assembly accommodated in the shell, the shell is provided with an opening on one side in a first direction, the end cap covers the opening, the end cap comprises an end cap body and a protruding structure, the protruding structure is arranged along the edge of the end cap body and protrudes away from the electrode assembly; A pressing plate is arranged on the side of the end cap away from the shell, the pressing plate is used to press the end cap body in the first direction, and the pressing plate and the protruding structure are arranged in the first direction. The surface of the pressing plate towards the battery cell is concavely provided with a groove, the protruding structure is arranged opposite to the groove and is at least partially accommodated in the groove.

2. The battery device of claim 1, wherein The protruding structure is arranged apart from the groove bottom surface.

3. The battery device of claim 2, wherein The depth of the groove is greater than the protruding height of the protruding structure.

4. The battery device of claim 3, wherein The width of the groove is greater than the width of the protruding structure, and the protruding structure is arranged apart from the side wall of the groove.

5. The battery device of claim 2, wherein A plurality of battery cells are arranged in a second direction, the pressing plate extends in the second direction and can be pressed against a plurality of battery cells, and the second direction is perpendicular to the first direction.

6. The battery device of any one of claims 2-5, wherein, The protruding structure comprises a first protruding part extending in a third direction, the groove comprises a first strip-shaped groove extending in the third direction, the first protruding part is arranged opposite to the first strip-shaped groove and is at least partially accommodated in the first strip-shaped groove, and the third direction is perpendicular to the first direction and intersects the second direction.

7. The battery device of claim 6, wherein The protruding structure comprises a second protruding part extending in the second direction, the groove comprises a second strip-shaped groove extending in the second direction, the second protruding part is arranged opposite to the second strip-shaped groove and is at least partially accommodated in the second strip-shaped groove.

8. The battery device according to claim 6 or 7, wherein A plurality of grooves are arranged on the pressing plate, and a plurality of grooves are arranged apart in the second direction, and the second direction is perpendicular to the first direction.

9. The battery device of any one of claims 2-8, wherein, The groove accommodates at least part of the protruding structure on one battery cell, or The adjacent edges of the two end cap bodies of two battery cells arranged in the second direction are provided with the protruding structure, and the groove simultaneously accommodates at least part of the protruding structure on two adjacent battery cells. The battery cell further comprises a spacer, and the spacer is arranged between the end cap body and the pressing plate.

10. The battery device of claim 1, wherein, In the first direction, the orthogonal projection of the spacer towards the end cap falls within the end cap body.

11. The battery device of claim 10, wherein, The thickness of the spacer is greater than the protruding height of the protruding structure.

12. The battery device according to claim 10 or 11, wherein The spacer is a glue layer, and the pressing plate is bonded to the surface of the end cap assembly through the glue layer.

13. The battery device of any one of claims 10-12, wherein, The protruding height of the protruding structure ranges from 0.05mm to 1.5mm, and the thickness of the glue layer ranges from 0.1mm to 3.5mm.

14. The battery device of claim 13, wherein, The spacer is an insulating patch, and the insulating patch is attached to the surface of the end cap body.

15. The battery device of any one of claims 10-12, wherein, The protruding structure is annular, and the protruding structure is arranged along the circumference of the end cap body, and the pressing plate and the part of the protruding structure opposite to the pressing plate are arranged apart in the first direction.

16. The battery device of any one of claims 1-15, wherein, ​ 17. The battery device of any one of claims 1-16, wherein, The end cover body comprises an end cover sheet, and the protruding structure is integrally formed with the end cover sheet.

18. The battery device of claim 17, wherein, The end cover sheet is made of steel or titanium.

19. The battery device of any one of claims 1-18, wherein, One side of the end cover sheet facing the shell is provided with a groove, one end of the shell is positioned in the groove, and the side of the end cover sheet away from the shell corresponds to the groove to form the protruding structure; and the welding mark formed by welding the end cover sheet and the shell is located at least on the outer side surface of the shell and the end cover sheet.

20. The battery device of any one of claims 1-19, wherein, The thickness of the end cover sheet is 0.6mm-1.5mm, and the thickness of the shell is 0.1mm-0.4mm.

21. An electrical device, comprising: The battery device comprises the battery device according to any one of claims 1-20, and is used for providing electric energy.

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