Battery device and electric device
Patent Information
- Application Number
- PCT/CN2025/078601
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2025-02-21
- Publication Date
- 2026-08-27
Smart Images
Figure CN2025078601_27082026_PF_FP_ABST
Abstract
Description
Battery device and electric device TECHNICAL FIELD
[0001] The present application relates to the field of battery, in particular to a battery device and an electric device. BACKGROUND
[0002] Energy saving and emission reduction is the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their energy saving and environmental protection advantages. For electric vehicles, battery technology is an important factor for their development.
[0003] The battery includes a battery box and a plurality of battery monomers arranged in the battery box. In order to reduce the risk of battery monomers shaking in the box, a pressing plate is usually arranged on the end cover of the battery monomer. However, the pressing plate and the battery monomer have the risk of separation, which affects the stability of the battery. SUMMARY
[0004] Therefore, the embodiments of the present application provide a battery device and an electric device, which can reduce the risk of separation of the pressing plate and the battery monomer, and improve the stability of the battery device.
[0005] The embodiments of the first aspect of the present application provide a battery device, comprising: a battery monomer assembly comprising a plurality of battery monomers, the battery monomer comprising a shell, an end cover and an electrode assembly contained in the shell, the shell being provided with an opening on one side along a first direction, the end cover being covered on the opening, the end cover comprising an end cover body and a protruding structure, the protruding structure being arranged along the edge of the end cover body and protruding in a direction away from the electrode assembly; a pressing plate at least partially located on the side of the end cover away from the shell, the pressing plate being used to press the end cover body along the first direction, and the pressing plate and the protruding structure being arranged in a spaced manner along the first direction.
[0006] In the battery device provided by the embodiments of the present application, the pressing plate plays a limiting role on the battery monomer, reducing the risk of shaking of the battery monomer. At the same time, by arranging the pressing plate and the protruding structure in a spaced manner, the pressing plate and the protruding structure will not be in direct contact, avoiding the local stress concentration caused by the pressing plate pressing on the protruding structure, reducing the risk of collapse and cracking of the protruding structure, and further reducing the risk of separation of the pressing plate and the battery monomer. The pressing plate can play a stable limiting role on the battery monomer, improving the stability of the battery device. At the same time, it also reduces the risk of sealing failure of the battery monomer due to local cracking.
[0007] In some embodiments, the surface of the pressing plate facing the battery monomer is concavely provided with a groove, the protruding structure is arranged opposite to the groove and at least partially contained in the groove.
[0008] By adopting the technical scheme, the groove on the pressing plate can avoid the protruding structure, and the remaining area of the pressing plate can press against the end cover body, so that the pressing 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 groove bottom surface.
[0010] By adopting the technical scheme, the protruding structure is not in contact with the groove bottom surface, and the protruding structure is not stressed, so that the risk of the protruding structure being crushed or cracking is reduced.
[0011] In some embodiments, the depth of the groove is greater than the protruding height of the protruding structure.
[0012] By adopting the technical scheme, since the depth of the groove is greater than the protruding height of the protruding structure, the protruding structure can be spaced apart from the groove bottom surface.
[0013] In some embodiments, the width of the groove is greater than the width of the protruding structure, and the protruding structure is spaced apart from the side wall of the groove.
[0014] By adopting the technical scheme, the pressing plate is not in contact with the side wall of the protruding structure, so that the risk of the protruding structure being damaged is further reduced, and in addition, the battery monomer and the pressing plate can be conveniently assembled, and the yield is high.
[0015] In some embodiments, a plurality of battery monomers are arranged along a second direction, the pressing plate extends along the second direction and can press against the plurality of battery monomers, and the second direction is perpendicular to the first direction.
[0016] By adopting the technical scheme, the pressing plate can limit the plurality of battery monomers arranged along the second direction, and the structural stability of the battery device is good.
[0017] In some embodiments, the protruding structure includes a first protruding portion extending along a third direction, the groove includes a first strip-shaped groove extending along the third direction, the first protruding portion is oppositely arranged with 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.
[0018] By adopting the technical scheme, the pressing plate can avoid the strip-shaped first protruding portion arranged on the end cover body through the first strip-shaped groove.
[0019] In some embodiments, the protruding structure includes a second protruding portion extending along the second direction, the groove includes a second strip-shaped groove extending along the second direction, the second protruding portion is oppositely arranged with the second strip-shaped groove and is at least partially accommodated in the second strip-shaped groove.
[0020] By adopting the technical scheme, the pressing plate can avoid the strip-shaped second protruding portion arranged on the end cover body through the second strip-shaped groove.
[0021] In some embodiments, the pressing plate is provided with a plurality of grooves, which are arranged at intervals along the second direction; the grooves accommodate at least part of the protruding structures on the battery monomer, or, among two adjacent battery monomers arranged along the second direction, the adjacent edges of the two end cover bodies are each provided with the protruding structures, and the grooves simultaneously accommodate at least part of the protruding structures on the two adjacent battery monomers.
[0022] By adopting the technical scheme, the pressing plate can avoid the protruding structures on the battery monomers through the plurality of grooves, and the structural stability of the battery device is good.
[0023] In some embodiments, the battery monomer further comprises a spacer, which is located between the end cover body and the pressing plate.
[0024] By adopting the technical scheme, the spacer can separate the protruding structures from the pressing plate, and solve the problem of stress concentration caused by the pressing plate directly pressing on the protruding structures.
[0025] In some embodiments, along the first direction, the projection of the spacer towards the end cover falls within the end cover body.
[0026] By adopting the technical scheme, along the first direction, neither the spacer nor the pressing plate presses on the protruding structures, and the spacer can protect the protruding structures.
[0027] In some embodiments, the thickness of the spacer is greater than the protruding height of the protruding structures.
[0028] By adopting the technical scheme, the pressing plate can be in plane contact with the battery monomer and the spacer, and the problem of stress concentration at the protruding structures is solved.
[0029] In some embodiments, the spacer is a glue layer, and the pressing plate is bonded to the surface of the end cover assembly through the glue layer.
[0030] By adopting the technical scheme, the glue layer as the spacer not only makes the top end of the pressing plate not in contact with the protruding structures, but also bonds and fixes the pressing plate to the end cover body, while reducing the risk of excessive expansion of the battery monomer along the first direction.
[0031] In some embodiments, the protruding height of the protruding structures ranges from 0.05 mm to 1.5 mm, and the thickness of the glue layer ranges from 0.1 mm to 3.5 mm.
[0032] By setting the thickness of the glue layer to be greater than or equal to 0.1 mm, the glue layer can effectively separate the protruding structures from the pressing plate; by setting the thickness of the glue 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 attached to a surface of the end cover body.
[0034] By adopting the technical scheme, the insulating patch is located between the pressing plate and the end cover body, which can separate the protruding structure and the pressing plate, and reduce the risk of collapse and cracking of the protruding structure.
[0035] In some embodiments, the protruding structure is annular, and the protruding structure is arranged along the circumference of the end cover body, and the pressing plate and the part of the protruding structure opposite to the pressing plate are arranged in the first direction.
[0036] By adopting the technical scheme, the annular protruding structure is arranged on the end cover body, which can reduce the difficulty of forming the end cover body and improve the service life of the manufacturing mold; the pressing plate and the part of the protruding structure opposite to the pressing plate are arranged in the first direction, which can prevent the pressing plate from collapsing the protruding structure or causing the protruding structure to crack.
[0037] In some embodiments, the end cover body includes an end cover sheet, and the protruding structure is integrally formed with the end cover sheet. The embodiments of the present application provide that the pressing plate and the protruding structure are arranged in the first direction, which can adapt to the structure of the end cover assembly.
[0038] In some embodiments, the end cover sheet is a steel cover or a titanium cover.
[0039] By adopting the technical scheme, the material of the end cover sheet is steel or titanium, which has high structural strength and is conducive to manufacturing the end cover sheet with a relatively thin thickness.
[0040] In some embodiments, one side of the end cover sheet facing the shell is provided with a positioning groove, one end of the shell is positioned in the positioning groove, and the side of the end cover sheet away from the shell corresponds to the positioning groove to form the protruding structure; and a 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.
[0041] By adopting the technical scheme, one end of the shell can be positioned and limited in the positioning groove, so as to solve the problems of poor positioning and welding of the end cover sheet and the shell; further, the end cover sheet and the shell can be connected by side welding, so that the battery monomer has good sealing reliability.
[0042] In some embodiments, the thickness of the end cover sheet is 0.6mm-1.5mm, and the thickness of the shell is 0.1mm-0.4mm.
[0043] By adopting the technical scheme, the structural strength and the energy density of the battery device can be considered.
[0044] The embodiments of the second aspect of the present application provide a power utilization device, which includes the battery device provided by the first aspect, and the battery device is used to provide electric 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, the following are specific embodiments of this application. 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 is a structural schematic diagram of a vehicle provided in an embodiment of this application;
[0048] Figure 2 is a schematic diagram of the structure of a battery device provided in an embodiment of this application;
[0049] Figure 3 is a top view of a battery cell and a pressure plate provided in an embodiment of this application;
[0050] Figure 4 is a perspective view of a battery cell provided in an embodiment of this application;
[0051] Figure 5 is a three-dimensional exploded view of the battery cell shown in Figure 4;
[0052] Figure 6 is a magnified view of part B in Figure 5;
[0053] Figure 7 is a partial cross-sectional view along line AA in Figure 3;
[0054] Figure 8 is a magnified view of part C in Figure 7;
[0055] Figure 9 is a partial cross-sectional view along line AA in Figure 3 in another embodiment;
[0056] Figure 10 is a partial enlarged view of part D in Figure 9;
[0057] Figure 11 is a partial cross-sectional view along line AA in Figure 3 in another embodiment;
[0058] The meanings of the marks in the figure are as follows: 1000, vehicle; 100, battery device; 200, controller; 300, motor; 10, box body; 11, upper box body; 12, lower box body; 20, battery monomer assembly; 21, battery monomer; 211, shell; 2111, opening; 212, end cover; 2121, end cover body; 21211, end cover sheet; 21212, insulating piece; 2122, protruding structure; 21221, first protruding part; 21222, second protruding part; 2123, positioning groove; 213, electrode assembly; 214, electrode terminal; 215, pressure relief mechanism; 30, pressing plate; 31, groove; 31a, first strip-shaped groove; 311, groove bottom surface; 312, side wall; 40, spacer; 40a, glue layer; 40b, insulating sheet. Embodiments of the present application
[0059] The embodiments of the technical solutions of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.
[0060] 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 belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application; the terms "comprising" and "having," and any variations thereof, as used in the specification and claims herein, are intended to cover not only the recited elements but also any additional elements.
[0061] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.
[0062] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearance of the phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily independent or alternative embodiments to each other. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.
[0063] In the description of the embodiments of the present application, the term "and / or" is merely an association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents an "or" relationship between the front and rear associated objects.
[0064] In the description of the embodiments of the present application, the term "a plurality of" means two or more (including two), and similarly, "a plurality of groups" means two or more groups (including two groups).
[0065] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanical connection, or it can be electrical connection; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.
[0066] In the embodiments of the present application, the battery cell can be a secondary battery, which refers to a battery cell that can be activated by charging after discharging.
[0067] The battery cell can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead-acid battery, etc. The embodiments of the present application are not limited in this regard.
[0068] The battery apparatus mentioned in the embodiments of the present application can include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly can include a plurality of battery cells connected in series, parallel or mixed connection through a busbar component.
[0069] In some embodiments, the battery cell assembly is usually formed by arranging a plurality of battery cells.
[0070] As an example, the battery cell assembly can be a battery module, which is formed by arranging and fixing a plurality of battery cells into an independent module. As an example, the battery module can be formed by bundling a plurality of battery cells with a cable tie.
[0071] In some embodiments, the battery device can be a battery pack including a box and one or more battery cell assemblies housed in the box.
[0072] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be housed in the box by fixing the battery module in the box.
[0073] As an example, the battery cell assembly can also be housed in the box by fixing a plurality of battery cells directly to the box.
[0074] In recent years, new energy vehicles have made a leap in development. In the field of electric vehicles, batteries, as the power source of electric vehicles, play an irreplaceable important role. Among them, the battery as a core part of new energy vehicles has a high requirement in reliability.
[0075] The battery usually includes a box and a plurality of battery cells arranged in the box. In order to reduce the risk of the battery cells shaking in the box, a pressing plate is usually arranged on the end cover of the battery cell. At present, the end cover of some battery cells has a protruding structure, and the pressing plate is pressed on the protruding structure, which is easy to cause the protruding structure to collapse and crack, so that the pressing plate is separated from the battery cell, weakening the limiting effect of the pressing plate on the battery cell, and even possibly affecting the sealing failure of the battery cell due to local cracking, affecting the stability of the battery.
[0076] Therefore, the embodiments of the present application provide a battery device, which includes a battery cell assembly and a pressing plate. The battery cell assembly includes a plurality of battery cells, and each battery cell includes a shell, an end cover and an electrode assembly. The shell is provided with an opening on one side along a first direction, and the end cover covers the opening. The end cover includes an end cover body and a protruding structure arranged on the edge of the end cover body, and the protruding structure protrudes in a direction away from the electrode assembly. The pressing plate is at least partially located on the side of the end cover away from the shell, and the pressing plate is used to press the end cover body along the first direction. The pressing plate and the protruding structure are arranged in a spaced manner along the first direction.
[0077] In the scheme provided by the embodiments of the present application, the pressing plate limits the battery cell and reduces the risk of the battery cell shaking. At the same time, by arranging the pressing plate and the protruding structure in a spaced manner, the pressing plate and the protruding structure will not directly contact in the first direction, avoiding the local stress concentration caused by the pressing plate pressing on the protruding structure, reducing the risk of the protruding structure collapsing and cracking, and further reducing the risk of the pressing plate separating from the battery cell. The pressing plate can stably limit the battery cell, improving the stability of the battery device. At the same time, it also reduces the risk of sealing failure of the battery cell due to local cracking.
[0078] The technical solutions described in the embodiments of the present application are applicable to various electric devices using battery monomers, for example, mobile phones, portable devices, notebook computers, electric vehicles, electric toys, electric tools, vehicles, ships and spacecraft, for example, spacecraft including airplanes, rockets, space shuttles and spaceships. The following embodiments take a vehicle as an example for convenience of description.
[0079] Please refer to FIG. 1, which is a structural schematic diagram of a vehicle 1000 provided by some embodiments of the present application. The vehicle 1000 can be a fuel automobile, a gas automobile or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid electric automobile or a range extended automobile. The vehicle 1000 is internally provided with a battery device 100, which can be arranged at the bottom, the head or the tail of the vehicle 1000. The battery device 100 can be used for power supply of the vehicle 1000, for example, the battery device 100 can be used as an operating power source of the vehicle 1000. The vehicle 1000 can further include a controller 200 and a motor 300, and the controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power demand of the vehicle 1000 during starting, navigation and driving.
[0080] In some embodiments of the present application, the battery device 100 can not only be used as an operating power source of the vehicle 1000, but also be used as a driving power source of the vehicle 1000, instead of or partially instead of fuel or natural gas to provide driving power for the vehicle 1000.
[0081] Please refer to FIGS. 2 to 4, the battery device 100 includes a box body 10 and a battery monomer assembly 20, the box body 10 includes an upper box body 11 and a lower box body 12, the upper box body 11 and the lower box body 12 are covered with each other, and the upper box body 11 and the lower box body 12 jointly define a containing space for containing battery monomers 21. The lower box body 12 can be a hollow structure with one end open, and the upper box body 11 can be a plate-shaped structure, which is covered on the open side of the lower box body 12 to jointly define the containing space with the lower box body 12. The upper box body 11 and the lower box body 12 can also be hollow structures with one side open, and the open side of the upper box body 11 is covered on the open side of the lower box body 12. Of course, the box body 10 formed by the upper box body 11 and the lower box body 12 can have various shapes, such as a cylinder, a cuboid, etc.
[0082] The battery monomer assembly 20 is usually formed by arranging a plurality of battery monomers 21. The battery monomer 21 is the smallest unit of the battery device 100, and the battery monomer 21 includes a shell 211, an end cover 212, an electrode assembly 213 and other functional components.
[0083] The end cover 212 refers to a component that covers the opening of the shell 211 to isolate the internal environment of the battery cell 21 from the external environment. Without limitation, the shape of the end cover 212 can be adapted to the shape of the shell 211 to fit the shell 211. Optionally, the end cover 212 can be made of a material with certain hardness and strength, such as aluminum alloy, so that the end cover 212 is less likely to deform when subjected to extrusion collision, allowing the battery cell 21 to have higher structural strength and improved use reliability. The end cover 212 can be provided with functional components such as the electrode terminal 214 and the pressure relief mechanism 215. The electrode terminal 214 can be used to electrically connect with the electrode assembly 213 for outputting or inputting the electrical energy of the battery cell 21. In some embodiments, the pressure relief mechanism 215 is used to release the internal pressure when the internal pressure or temperature of the battery cell 21 reaches a threshold value. The material of the end cover 212 can also be various, such as copper, iron, aluminum, stainless steel, titanium, aluminum alloy, plastic, etc., and the embodiments of the present application do not make special limitations thereon. In some embodiments, an insulating member can also be provided on the inner side of the end cover 212 to reduce the risk of short circuit. Exemplarily, the insulating member can be plastic, rubber, etc.
[0084] The shell 211 is a component used to fit the end cover 212 to form the internal environment of the battery cell 21, wherein the formed internal environment can be used to accommodate the electrode assembly 213, the electrolyte and other components. The shell 211 and the end cover 212 can be independent components, and an opening can be provided on the shell 211, and the end cover 212 is covered on the opening to form the internal environment of the battery cell 21. Without limitation, the end cover 212 and the shell 211 can also be integrated, specifically, the end cover 212 and the shell 211 can form a common connecting surface before other components enter the shell, and when it is necessary to seal the internal environment of the shell 211, the end cover 212 is covered on the shell 211. The shell 211 can be various shapes and various sizes, such as cuboid, cylinder, hexagonal prism, etc. Specifically, the shape of the shell 211 can be determined according to the specific shape and size of the electrode assembly 213. The material of the shell 211 can be various, such as copper, iron, aluminum, stainless steel, titanium, aluminum alloy, plastics, etc., and the embodiments of the present application do not make special limitations thereon.
[0085] The electrode assembly 213 is a component in which an electrochemical reaction occurs in the battery cell 21. One or more electrode assemblies 213 can be contained within the casing 211. The electrode assembly 213 is mainly formed by winding or layering a positive electrode sheet and a negative electrode sheet, and a separator is generally provided between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet and the negative electrode sheet have portions with active materials that constitute an end cap body of the electrode assembly 213, and portions without active materials that each constitute a tab. The positive electrode tab and the negative electrode tab can be located together at one end of the end cap body or at opposite ends of the end cap body. During charging and discharging of the battery device 100, the positive electrode active material and the negative electrode active material react with an electrolyte, and the tabs connect the electrode terminal 214 to form a current loop. In some embodiments, the battery cell 21 is provided with a pressure relief mechanism 215 on one side, which refers to 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.
[0086] Please refer to FIGS. 2-7, the embodiments of the first aspect of the present application propose a battery device 100, comprising a battery cell assembly 20 and a pressure plate 30, the battery cell assembly 20 comprises a plurality of battery cells 21, the battery cell 21 comprises a casing 211, an end cap 212, and an electrode assembly 213 contained in the casing 211, the casing 211 is provided with an opening 2111 on one side along a first direction Z, the end cap 212 covers the opening 2111, the end cap 212 comprises an end cap body 2121 and a protruding structure 2122, the protruding structure 2122 is provided 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 casing 211, the pressure plate 30 is used to press the end cap body 2121 along the first direction Z, and the pressure plate 30 is spaced apart from the protruding structure 2122 along the first direction Z.
[0087] The first direction Z is the height direction of the battery cell 21, and is also the arrangement direction of the end cap 212 and the casing 211.
[0088] The battery cell assembly 20 comprises a plurality of battery cells 21, for example, the battery cell assembly 20 comprises a plurality of battery cells 21 arranged in sequence along a second direction X, and a plurality of battery cell assemblies 20 are arranged in sequence along a third direction Y, so that the battery cells 21 are arranged in an array, and the third direction Y intersects the second direction X. Optionally, the second direction X can be the length direction of the box body 10, and the third direction Y can be the width direction of the box body 10; in other embodiments, the second direction X and / or the third direction Y can also be obliquely intersected with the length direction of the box body 10.
[0089] The battery cell 21 comprises a shell 211, an end cover 212, and an electrode assembly 213 contained in the shell 211. The shell 211 is provided with an opening 2111 on one side in the first direction Z, and the end cover 212 covers the opening 2111, that is, the end cover 212 is arranged on one side of the shell 211 in the first direction Z.
[0090] The end cover 212 comprises an end cover body 212 and a protruding structure 2122, which can be arranged on the edge of at least one side of the end cover body 212, and the protruding structure 2122 protrudes in a direction away from the electrode assembly 213. There can 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 cover body 212 by die stamping, which is convenient for forming and can improve the service life of the die.
[0091] The pressing plate 30 is arranged at least partially on the side of the end cover 212 away from the shell 211. For example, the pressing plate 30 is arranged entirely on the side of the end cover 212 away from the shell 211. In other embodiments, part of the pressing plate 30 is arranged on the side of the end cover 212 away from the shell 211.
[0092] The pressing plate 30 is used to press the end cover body 2121 in the first direction Z, and then press the battery cell 21, so that the pressing plate 30 can limit the battery cell 21, reduce the risk of the battery cell 21 shaking, and further reduce the risk of the battery cell 21 failing to electrically connect due to shaking.
[0093] It should be noted that the pressing plate 30 presses the end cover body 2121 in the first direction Z, which can be that the pressing plate 30 directly contacts and presses the end cover body 2121, or that the pressing plate 30 indirectly presses the end cover body 2121, that is, the pressing plate 30 and the end cover body 2121 can be further provided with other film layers or elements, for example, blue glue or a top patch is arranged between the pressing plate 30 and the end cover body 2121.
[0094] The pressing plate 30 can comprise an insulating material, such as a non-metallic material such as rubber, because the pressing plate 30 is close to the conductive structure (busbar, electrode terminal 214, etc.) of the battery cell 21, and the insulation of the pressing plate 30 can reduce the risk of short circuit of the battery device 100.
[0095] The pressing plate 30 is arranged opposite to the end cover body 212. The pressing plate 30 can be fixedly connected with the end cover body 212, or the pressing plate 30 can only abut against the end cover body 212, and the two do not need to be fixedly connected, as long as the pressing plate 30 can press the battery cell 21 in the first direction Z.
[0096] The pressing plate 30 is spaced apart from the protruding structure 2122 along the first direction Z, that is, along the first direction Z, the pressing 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 away from the end cover body 212. The top surface of the protruding structure 2122 can be a flat surface, an inclined surface, a chamfered surface, or the like.
[0097] The pressing plate 30 can be in contact with the end cover body 212 and away from the protruding structure 2122, or the pressing plate 30 can also not be in contact with the end cover body 212 and the protruding structure 2122. By spacing the pressing plate 30 from the protruding structure 2122, the problem of stress concentration caused by the pressing plate 30 pressing on the protruding structure 2122 can be avoided, and the risk of the protruding structure 2122 being crushed and cracked is reduced. Since the pressing plate 30 is not easy to crush the protruding structure 2122, the pressing plate 30 can be in abutment with the battery monomer 21, solving the risk of the pressing plate 30 and the battery monomer 21 being separated, improving the connection strength, and improving the use reliability and stability of the battery device 100. Since the pressing plate 30 is in stable abutment with the battery monomer 21, the battery monomer 21 is not easy to shake and vibrate up and down, which is conducive to the stable electrical connection between the electrode terminal 214 and the conductive structure.
[0098] In the battery device 100 provided by the embodiments of the present application, the pressing plate 30 plays a limiting role on the battery monomer 21, reducing the risk of the battery monomer 21 shaking; by spacing the pressing plate 30 from the protruding structure 2122, the pressing plate 30 and the top end of the protruding structure 2122 are not directly in contact, avoiding the local stress concentration caused by the pressing plate 30 pressing on the protruding structure 2122, reducing the risk of the protruding structure 2122 being crushed and cracked, and further reducing the risk of the pressing plate 30 and the battery monomer 21 being separated. The pressing plate 30 can play a stable limiting role on the battery monomer 21, improving the stability of the battery device 100; at the same time, it also reduces the risk of the battery monomer 21 being sealed due to local cracking.
[0099] Please refer to FIG. 3, FIG. 7 and FIG. 8, in some embodiments, the surface of the pressing plate 30 facing the battery monomer 21 is recessed with a groove 31, the protruding structure 2122 is oppositely arranged with the groove 31 and at least partially accommodated in the groove 31.
[0100] The surface of the pressing plate 30 facing the battery monomer 21 is used to press the end cover 212 of the battery monomer 21, and the surface is recessed with a groove 31. Optionally, as shown in FIG. 7 and FIG. 8, in some embodiments, the area of the surface except the groove 31 can be a flat surface, so as to be pressed on the battery monomer 21. It can be understood that the surface can also be a structure adapted to the surface of the end cover 212.
[0101] 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.
[0102] 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.
[0103] In some embodiments, the protrusion structure 2122 and the groove bottom surface 311 of the groove 31 are spaced apart.
[0104] As shown in Figures 7 and 8, 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.
[0105] 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.
[0106] In other embodiments, cushioning elements such as buffer foam can be provided in the groove 31 to protect the protruding structure 2122.
[0107] As shown in Figures 7 and 8, in some embodiments, the depth H2 of the groove 31 is greater than the protrusion height H1 of the protrusion structure 2122.
[0108] 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.
[0109] 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.
[0110] In other embodiments, the surface of the end cap body 212 is provided with a top cover patch, a glue layer or other spacers 40, and the depth of the groove 31 can be less than or equal to the height of the protruding structure 2122.
[0111] Please continue to refer to FIGS. 6-8. In some embodiments, the width W2 of the groove 31 is greater than the width W1 of the protruding structure 2122, and the protruding structure 2122 is spaced apart from the sidewall 312 of the groove 31.
[0112] The width direction of the groove 31 and the width direction of the protruding structure 2122 are the same, both being perpendicular to the first direction Z. In this embodiment, the width direction of the groove 31 and the width direction of the protruding structure 2122 are the second direction X.
[0113] In some embodiments, the width of the protruding structure 2122 is 0.05-1.0 mm. The protruding structure 2122 is usually formed by stamping, and the width is small. Alternatively, the width of the groove 31 is greater than 0.1 mm to facilitate assembly.
[0114] By setting the width of the groove 31 to be greater than the width of the protruding structure 2122, the protruding structure 2122 can not contact the sidewall 312 of the groove 31, further reducing the risk of damage to the protruding structure 2122. In addition, the battery monomer 21 and the pressing plate 30 can be easily assembled, and the yield is high.
[0115] Please refer to FIGS. 3 and 4. In some embodiments, a plurality of battery monomers 21 are arranged along the second direction X, and the pressing plate 30 extends along the second direction X and can be pressed against the plurality of battery monomers 21. The second direction X is perpendicular to the first direction Z.
[0116] The battery monomer assembly 20 includes a plurality of battery monomers 21 arranged in sequence along the second direction X, and the pressing plate 30 extends along the second direction X, i.e., the pressing plate 30 can span the plurality of battery monomers 21 to simultaneously press against the plurality of battery monomers 21. Alternatively, the pressing plate 30 can be a strip-shaped plate.
[0117] In some embodiments, the battery device 100 includes a box 10, and the box 10 includes a pair of crossbeams arranged along the second direction X, and the two ends of the pressing plate 30 are fixed on the two crossbeams, respectively, so that the pressing plate 30 can simultaneously press against a row of battery monomers 21 arranged along the second direction X. It can be understood that the pressing plate 30 can also be fixed in other ways, for example, one end of the pressing plate 30 is fixed on a crossbeam in the middle of the box 10 or the pressing plate 30 is fixed on the upper box.
[0118] The end cover 212 of one or more battery cells 21 is provided with a protruding structure 2122. The pressing plate 30 can be arranged to abut against the plurality of battery cells 21.
[0119] By adopting the technical scheme, the pressing plate 30 can limit the plurality of battery cells 21 arranged along the second direction X, and the structural stability of the battery device 100 is good.
[0120] Please refer to FIGS. 5 to 8. In some embodiments, the protruding structure 2122 includes a first protruding part 21221 extending along a third direction Y, the groove 31 includes a first strip-shaped groove 311 extending along the third direction Y, the first protruding part 21221 is arranged opposite to the first strip-shaped groove 311 and is at least partially accommodated in the first strip-shaped groove 311, and the third direction Y is perpendicular to the first direction Z and intersects the second direction X.
[0121] The third direction Y is the length direction of the battery cell 21, and the first protruding part 21221 is arranged at the edge of the end cover body 212 and extends along the length direction of the battery cell 21. Since the pressing plate 30 extends along the second direction X and is arranged across the battery cell 21, in order to avoid the protruding structure 2122, the groove 31 includes the first strip-shaped groove 311 extending along the third direction Y, so that the first strip-shaped groove 311 is matched with the first protruding part 21221, and the remaining area of the pressing plate 30 can still abut against the battery cell 21.
[0122] Optionally, the first strip-shaped groove 311 penetrates through the opposite ends of the pressing plate 30 along the third direction Y, and the first protruding part 21221 can be completely accommodated in the first strip-shaped groove 311, so as to facilitate the pressing plate 31 to avoid the first protruding part 21221.
[0123] Optionally, the protruding structure 2122 includes two first protruding parts 21221, and the two first protruding parts 21221 are arranged at the two sides of the battery cell 21 along the second direction X, respectively. Correspondingly, the area of the pressing plate 30 opposite to the battery cell 21 is provided with two first strip-shaped grooves 311, and the two first strip-shaped grooves 311 accommodate the two first protruding parts 21221, respectively.
[0124] Optionally, the protruding structure 2122 further includes two second protruding parts 21222, and the two second protruding parts 21222 are arranged at the two sides of the battery cell 21 along the third direction Y, respectively.
[0125] In the embodiment, two electrode terminals 214 are arranged on the end cover 212, and the pressing plate 30 is arranged between the two electrode terminals 214, that is, the pressing plate 30 does not cover the second protruding portion 21222; it can be understood that, if the pressing plate 30 covers the second protruding portion 21222, a second strip-shaped groove for accommodating the second protruding portion 21222 can also be arranged on the pressing plate 30.
[0126] By adopting the technical scheme, the pressing plate 30 provided in the embodiment can avoid the strip-shaped first protruding portion 21221 arranged on the end cover body 212.
[0127] In some embodiments, the protruding structure 2122 includes a second protruding portion 21222 extending along the second direction X, the groove 31 includes a second strip-shaped groove (not shown in the figure) extending along the second direction X, and the portion of the second protruding portion 21222 opposite to the pressing plate 30 is accommodated in the second strip-shaped groove. In this way, the pressing plate 30 can avoid the strip-shaped second protruding portion 21222 extending along the second direction X.
[0128] By adopting the technical scheme, the pressing plate 30 provided in the embodiment can avoid the strip-shaped second protruding portion 21222 arranged on the end cover body 212.
[0129] Optionally, the two rows of battery monomers 21 are arranged adjacent to each other along the third direction Y, the pressing plate 30 is arranged between the two battery monomers 21 arranged adjacent to each other along the third direction Y, and the pressing plate 30 covers the two second protruding portions 21222 adjacent to each other on the two battery monomers 21; at this time, the pressing plate 30 can simultaneously abut against the two rows of battery monomers 21 and avoid the second protruding portion 21222 through the second strip-shaped groove.
[0130] Optionally, the groove 31 simultaneously includes the second strip-shaped groove extending along the second direction X and the first strip-shaped groove 311 extending along the third direction Y, and respectively accommodates the corresponding second protruding portion 21222 and the first protruding portion 21211.
[0131] It can be understood that the position of the pressing plate 30 can be flexibly arranged.
[0132] In some embodiments, the pressing plate 30 is provided with a plurality of grooves 31, and the plurality of grooves 31 are arranged at intervals along the second direction X; wherein the groove 31 accommodates at least part of the protruding structure 2122 on one battery monomer 21, or, among two battery monomers 21 arranged adjacent to each other along the second direction X, the adjacent edges of the two end cover bodies 2121 are each provided with a protruding structure 2122, and the groove 31 simultaneously accommodates at least part of the protruding structure 2122 on the two adjacent battery monomers 21.
[0133] Optionally, each first strip-shaped groove 311 is arranged opposite to one first protruding portion 21221 to accommodate the first protruding portion 21221.
[0134] Optionally, the groove 31 can also accommodate the first protruding part 21221 on two adjacent battery monomers 21 at the same time. Since the plurality of battery monomers 21 are arranged in sequence along the second direction X, any two adjacent battery monomers 21 abut each other, and the first protruding part 21221 on the two adjacent battery monomers 21 are also arranged adjacent to each other, then a first strip-shaped groove 311 can be arranged opposite to the first protruding part 21221 on the two battery monomers 21. By arranging the groove 31 to accommodate the protruding structure 2122 on the two adjacent battery monomers 21, the number of grooves 31 can be reduced, and the manufacturing difficulty of the pressing plate 30 is reduced.
[0135] By adopting the above technical scheme, the pressing plate 30 can avoid the protruding structure 2122 on the plurality of battery monomers 21 through the plurality of grooves 31, and the structural stability of the battery device 100 is good.
[0136] Please refer to FIG. 9 and FIG. 10, the battery monomer 21 also includes a spacer 40, the spacer 40 is located between the end cover body 212 and the pressing plate 30, and the spacer 40 can separate the protruding structure 2122 from the pressing plate 30.
[0137] The spacer 40 is fixed on the end cover body 212, and optionally, the spacer 40 does not cover the protruding structure 2122.
[0138] The pressing plate 30 is connected with the spacer 40, and the pressing plate 30 can be pressed on the spacer 40 to press the battery monomer 21 along the first direction Z. Among them, the pressing plate 30 can be fixedly connected with the spacer 40, or can be connected through abutting.
[0139] By adopting the above technical scheme, the pressing plate 30 is pressed on the end cover 212 of the battery monomer 21 through the spacer 40, the spacer 40 can separate the protruding structure 2122 from the pressing plate 30, and the stress concentration problem caused by directly pressing the pressing plate 30 on the protruding structure 2122 is solved. Therefore, the spacer 40 can protect the protruding structure 2122, and the risk of collapse and cracking of the protruding structure 2122 is reduced.
[0140] In some embodiments, along the first direction Z, the orthogonal projection of the spacer 40 towards the end cover 212 falls within the end cover body 2121.
[0141] Along the first direction Z, the orthogonal projection of the spacer 40 towards the end cover 212 fall within the end cover body 2121, that is, the spacer 40 is arranged opposite to the end cover body 2121. Along the first direction Z, neither the spacer 40 nor the pressing plate 30 is pressed on the protruding structure 2122, and the spacer 40 does not cover the protruding structure 2122, so that the spacer 40 will not have the problem of stress concentration on the protruding structure 2122.
[0142] In some embodiments, the thickness of the spacer 40 is greater than the protruding height of the protruding structure 2122.
[0143] The thickness of the spacer 40 is greater than the protruding height of the protruding structure 2122 on the end cover body 2121, so that the spacer 40 is clamped between the end cover body 2121 and the pressing plate 30, and the spacer 40 can be arranged between the pressing plate 30 and the protruding structure 2122.
[0144] By adopting the above technical solution, the pressing plate 30 can be in plane contact with the battery monomer 21 and the spacer 40, and the problem of stress concentration at the protruding structure 2122 is solved.
[0145] As shown in FIG. 10, in some embodiments, the spacer 40 is a glue layer 40a, and the pressing plate 30 is bonded to the surface of the end cover 212 through the glue layer 40a.
[0146] The glue layer 40a can be a cured glue or a tape, and the glue layer 40a plays a role of bonding the pressing plate 30 and the end cover body 212, so that the fixing of the pressing plate 30 is more reliable, and the pressing plate 30 is prevented from shaking and colliding with the electrode terminal 214, so that the electrode terminal 214 and the conductive structure can be stably electrically connected.
[0147] Optionally, the glue layer 40a is located on the surface of the end cover body 212, and the glue layer 40a does not cover the protruding structure 2122. In the first direction Z, the height of the glue layer 40a is greater than the height of the protruding structure 2122.
[0148] By adopting the above technical solution, the glue layer 40a as the spacer 40 not only prevents the pressing plate 30 from contacting the top end of the protruding structure 2122, but also bonds and fixes the pressing plate 30 and the end cover body 212, improves the connection reliability between the pressing plate 30 and the battery monomer 21, reduces the risk of the battery monomer 21 shaking, and reduces the risk of the battery monomer 21 excessively expanding in the first direction Z.
[0149] In addition, the pressing plate 30 is bonded to the plurality of battery monomers 21 through the glue layer 40a, so that the pressing plate 30 and the plurality of battery monomers 21 form an integral whole, which is conducive to improving the structural strength and stability of the plurality of battery monomers 21 in the box, and thus the use stability of the battery device can be effectively improved.
[0150] In some embodiments, the protruding height of the protruding structure 2122 is 0.05mm-1.5mm, and the thickness of the glue layer 40a is 0.1mm-3.5mm.
[0151] Figure 10 illustrates the thickness H3 of the glue layer 40a. The protruding height of the protruding structure 2122 can be 0.05mm, 0.1mm, 0.5mm, 1.0mm, 1.5mm, etc., the thickness of the glue layer 40a can be 0.1mm, 1mm, 2mm, 3mm, 3.5mm, etc., and the thickness of the glue layer 40a is greater than the protruding height of the protruding structure 2122.
[0152] By setting the thickness of the glue layer 40a to be greater than or equal to 0.1mm, the glue layer 40a can effectively separate the protruding structure 2122 and the pressing plate 30; by setting the thickness of the glue layer 40a to be less than or equal to 3.5mm, it is beneficial to save space and improve the energy density of the battery device 100.
[0153] 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 cover body 2121.
[0154] The insulating patch 40b is a patch made of insulating material, which can also be called a top cover patch. The insulating patch 40b can be fixed on the surface of the end cover body 2121 by glue, and the insulating patch 40b can have an insulating and protective effect. At the same time, the insulating patch is located between the pressing plate 30 and the end cover body 2121, which can separate the protruding structure 2122 and the pressing plate 30, and reduce the risk of collapse and cracking of the protruding structure 2122.
[0155] Optionally, the insulating patch 40b covers the surface of the end cover body 2121, and a plurality of functional holes are provided on the insulating patch 40b to expose the electrode terminal 214 and other components. The insulating patch 40b can also be provided with an adhesive hole to expose the glue applied on the end cover body 2121, and the glue can pass through the adhesive hole to connect the pressing plate 30 and the battery monomer 21.
[0156] It can be understood that the thickness of the insulating patch 40b is greater than the protruding height of the protruding structure 2122.
[0157] In some embodiments, the protruding structure 2122 is annular, and the protruding structure 2122 is arranged along the circumference of the end cover body 212, and the pressing plate 30 and the part of the protruding structure 2122 opposite to the pressing plate 30 are arranged in the first direction Z.
[0158] The protruding structure 2122 is annular and arranged along the edge of the end cover body 212 in the circumferential direction. When the end cover body 212 is circular, the protruding structure 2122 is circular. When the end cover body 212 is square, the protruding structure 2122 is square. In this embodiment, the protruding structure 2122 includes two first protruding portions 21221 arranged opposite to each other in the second direction X and two second protruding portions 21222 arranged opposite to each other in the second direction X. The first protruding portions 21221 are connected to the second protruding portions 21222, and the protruding structure 2122 is annular and closed. The pressing plate 30 is arranged opposite to part of the first protruding portions 21221 in the first direction Z.
[0159] Optionally, the shell 211 is welded to the end cover 212. By arranging the protruding structure 2122 to be annular, the protruding structure 2122 can also be welded to the shell 211, thereby improving the connection strength and sealing reliability.
[0160] By arranging the protruding structure 2122 to be annular on the end cover body 212, the forming difficulty of the end cover body 212 can be reduced, and the service life of the manufacturing mold can be improved. The pressing plate 30 and part of the protruding structure 2122 arranged opposite to the pressing plate 30 are arranged in the first direction Z. Therefore, the pressing plate 30 is less likely to crush the protruding structure 2122 or cause the protruding structure 2122 to crack. The sealing reliability of the battery monomer 21 is good, and the pressing plate 30 can abut against the battery monomer 21, so that the battery monomer 21 is less likely to shake.
[0161] In other embodiments, the protruding structure 2122 can also include a plurality of discontinuous protruding portions.
[0162] In some embodiments, the end cover body 2121 includes an end cover sheet 21211, and the protruding structure 2122 is integrally formed with the end cover sheet 21211.
[0163] The end cover body 212 can further include an insulating member 21212 connected to the end cover sheet 21211. The insulating member 21212 is arranged on the side of the end cover sheet 21211 close to the electrode assembly 213, and serves as an insulating member.
[0164] The protruding structure 2122 is integrally formed with the end cover sheet 21211. In this embodiment, the pressing plate 30 is arranged opposite to the protruding structure 2122, which can adapt to the structure of the end cover 212.
[0165] In some embodiments, the end cover sheet 21211 in the end cover 212 is a steel cover or a titanium cover.
[0166] Compared with the end cover sheet 21211 made of aluminum or other materials, the end cover sheet 21211 made of steel or titanium has higher structural strength, which is conducive to manufacturing the end cover sheet 21211 to have a smaller thickness.
[0167] In some embodiments, the shell 211 can also be a steel shell or a titanium shell.
[0168] In some embodiments, the end cover sheet 21211 is provided with a positioning groove 2123 on the side facing the shell 211, one end of the shell 211 is positioned in the positioning groove 2123, and a protruding structure 2122 is formed on the side of the end cover sheet 21211 away from the shell 211 corresponding to the positioning groove 2123; the welding mark formed by welding the end cover sheet 21211 and the shell 211 is at least located on the outer side surface of the shell 211 and the end cover sheet 21211.
[0169] The positioning groove 2123 can be formed on the end cover sheet 21211 by stamping, and based on the forming of the positioning groove 2123, the protruding structure 2122 can be formed on the side of the end cover sheet 21211 away from the shell 211 corresponding to the positioning groove 2123.
[0170] The positioning groove 2123 extends along the circumference of the end cover sheet 21211, and the positioning groove 2123 can be arranged in a ring shape, and correspondingly, the protruding structure 2122 is also arranged in a ring shape. In other embodiments, the positioning groove 2123 can also be divided into two opposite strip-shaped grooves, so that the protruding structure is also divided into two opposite protruding strips.
[0171] The end cover sheet 21211 and the shell 211 are connected and sealed by welding. The welding can be, but is not limited to, laser welding, ultrasonic welding, etc.
[0172] Since one end of the shell 211 is positioned in the positioning groove 2123 of the end cover sheet 21211, during welding, instead of using the top welding method, the side welding method is used to weld from the side of the end cover sheet 21211 and the shell 211, and the welding mark formed by welding is at least located on the outer side surface of the shell 211 and the end cover sheet21211. Optionally, the welding mark can also be partially located on the protruding structure 2122, further improving the welding area and the reliability of the welding.
[0173] By using the above technical solution, the end cover sheet 21211 is provided with a positioning groove 2123 on the one side facing the shell 211, and one end of the shell 211 can be positioned and limited in the positioning groove 2123, so as to solve the problem that the end cover sheet 21211 and the shell 211 are not easy to position and weld badly; further, the end cover sheet 21211 and the shell 211 can be connected by side welding, so that the battery monomer 21 has good sealing reliability.
[0174] In some embodiments, the thickness of the end cover sheet 21211 is 0.6mm-1.5mm, and the thickness of the shell 211 is 0.1mm-0.4mm.
[0175] Optionally, the end cover sheet 21211 is made of steel or titanium, which has higher structural strength than aluminum end cover. The end cover sheet 21211 can be made thinner.
[0176] The thickness of the end cover sheet 21211 can be 0.6 mm, 0.7 mm, 0.8 mm, 1.0 mm, 1.2 mm, 1.5 mm, etc. By setting the thickness of the end cover sheet 21211 to be greater than or equal to 0.6 mm, the end cover sheet 21211 can have better structural strength and reduce the risk of deformation. By setting the thickness of the end cover sheet 21211 to be less than or equal to 1.5 mm, the end cover sheet 21211 can occupy less space and have less weight, which is beneficial to improve the energy density of the battery device. Optionally, the thickness of the end cover sheet 21211 can be 0.7 mm-1.2 mm.
[0177] The thickness of the shell 211, i.e. the wall thickness of the shell 211, can be 0.1 mm, 0.15 mm, 0.2 mm, 0.25 mm, 0.3 mm, 0.35 mm, 0.4 mm, etc.
[0178] By setting the thickness of the shell 211 to be greater than or equal to 0.1 mm, the shell 211 can have a certain thickness dimension, reducing the risk of cracking due to electrode assembly expansion and improving the use reliability of the battery monomer 21. By setting the thickness of the shell 211 to be less than or equal to 0.4 mm, the shell 211 can occupy less space and have less weight, which is beneficial to improve the energy density of the batter device. Optionally, the thickness of the shell 211 can be 0.15 mm-0.35 mm.
[0179] By setting the thickness of the end cover sheet 21211 and the shell 211 to meet the above conditions, the structural strength and the energy density of the battery device can be considered.
[0180] Please refer to FIGS. 2-11, the embodiments of the present application provide a battery device 100, which includes a battery monomer assembly 20 and a pressing plate 30. The battery monomer assembly 20 includes a plurality of battery monomers 21 arranged along a second direction X, and the pressing plate 30 extends along the second direction X and presses the plurality of battery monomers 21. The battery monomer 21 includes a shell 211, an end cover 212, and an electrode assembly 213. The end cover 212 includes an end cover body 212 and a protruding structure 2122. The protruding structure 2122 is arranged along the edge of the end cover body 212 and protrudes in a direction away from the electrode assembly 213. The pressing plate 30 is spaced apart from the protruding structure 2122 and can press the end cover body 212 along a first direction Z.
[0181] In some embodiments, the pressing plate 30 is concavely provided with a groove 31 towards the surface of the battery cell 21, the protruding structure 2122 is oppositely arranged with the groove 31 and is at least partially accommodated in the groove 31; in other embodiments, the battery cell 21 further comprises a spacer 40, the spacer 40 is arranged between the pressing plate 30 and the end cover body 2121, and the spacer 40 can separate the protruding structure 2122 and the pressing plate 30.
[0182] Embodiments of the second aspect of the present application provide a power-using device, comprising the battery device 100 provided in the first aspect, and the battery device 100 is used to provide electric energy.
[0183] The power-using device can be a device or system of any of the foregoing applications of the battery device 100.
[0184] The above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacements for some technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.
Claims
1. A battery device, wherein, include: A battery cell assembly includes multiple battery cells. Each battery cell includes a housing, an end cap, and an electrode assembly housed within the housing. 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. The protruding structure is disposed along the edge of the end cap body and protrudes in a direction away from the electrode assembly. A pressure plate, at least partially located on the side of the end cap away from the housing, is used to press against the end cap body along the first direction, and the pressure plate and the protruding structure are spaced apart along the first direction.
2. The battery device as claimed in claim 1, wherein, The pressure plate has a recessed groove on its surface facing the battery cell, and the protruding structure is disposed opposite to the groove and is at least partially accommodated within the groove.
3. The battery device as claimed in claim 2, wherein, The protruding structure is spaced apart from the bottom surface of the groove.
4. The battery device as claimed in claim 3, wherein, The depth of the groove is greater than the protrusion height of the protrusion structure.
5. The battery device as claimed in claim 2, wherein, The width of the groove is greater than the width of the protrusion, and the protrusion is spaced apart from the sidewall of the groove.
6. The battery device according to any one of claims 2-5, wherein, The plurality of battery cells are arranged along a second direction, and the pressure plate extends along the second direction and is able to press against the plurality of battery cells, the second direction being perpendicular to the first direction.
7. The battery device as claimed in claim 6, wherein, The protrusion structure includes a first protrusion extending along a third direction, and the groove includes a first strip groove extending along the 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.
8. The battery device as claimed in claim 6 or 7, wherein, The protrusion structure includes a second protrusion extending along the second direction, and the groove includes a second strip groove extending along the second direction. The second protrusion is disposed opposite to the second strip groove and is at least partially accommodated within the second strip groove.
9. The battery device according to any one of claims 2-8, wherein, The pressure plate is provided with a plurality of grooves, which are spaced apart along a second direction, and the second direction is perpendicular to the first direction. Wherein, the groove accommodates at least a portion of the protrusion structure on one of the battery cells, or, In two adjacent battery cells arranged along the second direction, the adjacent edges of the two end cap bodies are provided with the protrusion structure, and the groove simultaneously accommodates at least part of the protrusion structure on the two adjacent battery cells.
10. The battery device as claimed in claim 1, wherein, The battery cell also includes a spacer, which is located between the end cap body and the pressure plate.
11. The battery device of claim 10, wherein, Along the first direction, the orthographic projection of the spacer toward the end cap falls within the end cap body.
12. The battery device as claimed in claim 10 or 11, wherein, The thickness of the spacer is greater than the protrusion height of the protrusion structure.
13. The battery device according to any one of claims 10-12, wherein, The spacer is an adhesive layer, and the pressure plate is bonded to the surface of the end cap assembly through the adhesive layer.
14. The battery device of claim 13, wherein, The protrusion height of the raised structure ranges from 0.05mm to 1.5mm, and the thickness of the adhesive layer ranges from 0.1mm to 3.5mm.
15. The battery device according to any one of claims 10-12, wherein, The spacer is an insulating patch, which is attached to the surface of the end cap body.
16. The battery device according to any one of claims 1-15, wherein, The protruding structure is annular and is arranged circumferentially along the end cap body. The pressure plate and the portion of the protruding structure opposite to the pressure plate are spaced apart along the first direction.
17. The battery device according to any one of claims 1-16, wherein, The end cap body includes an end cap piece, and the protruding structure is integrally formed with the end cap piece.
18. The battery device of claim 17, wherein, The end cap is a steel cap or a titanium cap.
19. The battery device according to any one of claims 1-18, wherein, The end cap has a groove on the side facing the housing, one end of the housing is positioned in the groove, and the side of the end cap away from the housing forms the protrusion structure corresponding to the groove; the weld mark formed by welding the end cap to the housing is located at least on the outer surfaces of the housing and the end cap.
20. The battery device according to any one of claims 1-19, wherein, The end cap has a thickness of 0.6mm-1.5mm, and the housing has a thickness of 0.1mm-0.4mm.
21. An electrical appliance, wherein, Includes a battery device as described in any one of claims 1-20, the battery device being used to provide electrical energy.