CN217740656U - End cover assembly, battery monomer, battery and consumer - Google Patents

Abstract

The application provides an end cover assembly, a battery monomer, a battery and electric equipment, and relates to the field of batteries. The end cap assembly includes an end cap, a groove, and a reinforcement. The end cap has a first surface and a second surface oppositely disposed in a thickness direction thereof. The groove is recessed from the first surface in a direction closer to the second surface. The reinforcing part is convexly arranged on the first surface and/or the second surface and is arranged around the groove. The end cover assembly has the advantages that the reinforcing part is arranged on the end cover, so that the strength and rigidity of the end cover are enhanced, the impact resistance of the end cover is improved, the deformation of the end cover is smaller when the end cover is impacted, and the problem that the electrode assembly is damaged due to the deformation of the end cover is solved. In addition, the end cover assembly reduces the weight of the end cover by arranging the groove on the end cover, so that the weight of the end cover is not different or the same before and after the reinforcement is arranged. By arranging the reinforcement part around the groove, the rigidity and strength of the position where the groove is arranged can be reinforced, and the strength and rigidity of the end cover assembly can be improved without greatly increasing the weight of the end cover assembly.

Description

End cover assembly, battery monomer, battery and consumer

Technical Field

The application relates to the field of batteries, in particular to an end cover assembly, a battery monomer, a battery and electric equipment.

Background

Batteries are widely applied in the field of new energy resources, such as electric vehicles, new energy vehicles and the like, and the new energy vehicles and the electric vehicles become new development trends of the automobile industry. The battery monomer comprises an end cover, an electrode assembly and a shell, wherein the end cover and the shell are matched to form the internal environment of the battery monomer, and the electrode assembly is accommodated in the internal environment. However, in the cell-inverted scenario, damage often occurs to the electrode assembly, resulting in cell failure.

SUMMERY OF THE UTILITY MODEL

An object of the embodiment of the present application is to provide an end cap assembly, a battery cell, a battery and a power consumption device, which aim to alleviate the problem that in the related art, in a scenario of cell inversion, an electrode assembly is often damaged.

In a first aspect, embodiments of the present application provide an end cap assembly including an end cap, a groove, and a reinforcement portion, the end cap having a first surface and a second surface oppositely disposed along a thickness direction thereof, the groove being recessed from the first surface in a direction approaching the second surface; the reinforcing part is convexly arranged on the first surface and/or the second surface and is arranged around the groove.

In the technical scheme, the end cover assembly has the advantages that the reinforcing part is arranged on the end cover, so that the strength and rigidity of the end cover are enhanced, the impact resistance of the end cover is improved, the deformation of the end cover is small when the end cover is impacted, and the problem that the electrode assembly is damaged due to the deformation of the end cover is solved. In addition, the end cover assembly reduces the weight of the end cover by arranging the groove on the end cover, so that the weight of the front end cover and the weight of the rear end cover which are provided with the reinforcing parts are not different or the same. By arranging the reinforcement part around the groove, the rigidity and strength of the position where the groove is arranged can be reinforced, and the strength and rigidity of the end cover assembly can be improved without greatly increasing the weight of the end cover assembly.

As an optional technical solution of the embodiment of the present application, along the thickness direction, a distance between the first surface and the second surface is D, and a distance between the bottom surface of the groove and the first surface is D, which satisfies: D/D is more than or equal to 0.1 and less than or equal to 0.6.

In the above technical solution, the distance between the first surface and the second surface in the thickness direction may also be understood as the thickness of the end cap. The distance of the bottom surface of the recess from the first surface in the thickness direction may also be understood as the depth of the recess. The depth of the groove is 0.1-0.6 times of the thickness of the end cover. Therefore, the end cover has a good weight reduction effect, and the strength of the end cover cannot be greatly weakened. If D/D is less than 0.1, the depth of the groove is shallow, and the weight reduction effect is poor. If D/D > 0.6, the depth of the groove is large, and the strength of the end cap is weakened so much that the strength of the end cap is poor even if the reinforcing portion is provided.

As an optional solution of the embodiment of the present application, the end cap is provided with a convex portion and a concave portion, the convex portion is convexly provided on the second surface, the concave portion is recessed from the first surface toward a direction close to the second surface, and the concave portion is provided corresponding to the convex portion; projections of the convex portion and the reinforcing portion on the end cap do not overlap in the thickness direction.

In the technical scheme, the convex part is formed on the second surface, and the concave part is formed at the position, corresponding to the convex part, of the first surface, on one hand, the concave part can accommodate parts inside the battery cell, so that the energy density of the battery cell is improved, on the other hand, the convex part can improve the bending strength of the end cover, and the impact resistance of the end cover is improved. The projections of the reinforcing part and the convex part on the end cover along the thickness direction are not overlapped, namely the reinforcing part and the convex part are arranged at intervals or in a staggered mode in a plane perpendicular to the thickness direction, so that the strength and the rigidity of different positions of the end cover are respectively enhanced, the impact resistance of the end cover is improved, and the problem that the end cover deforms and damages the electrode assembly is solved.

As an optional technical solution of the embodiment of the present application, the end cap assembly includes an electrode terminal, and the electrode terminal is disposed on the convex portion.

In the technical scheme, the electrode terminal can be electrically connected with the electrode assembly in the single battery body, and the electrode terminal is arranged on the convex part, so that the electrode assembly is partially accommodated in the concave part, and the improvement of the energy density of the single battery body is facilitated. In addition, the convex part has strong impact resistance, so that the electrode terminal is not easy to damage due to the deformation of the end cover when the electrode terminal is arranged at the convex part.

As an optional technical solution of the embodiment of the present application, along a first direction, both sides of the convex portion are provided with the reinforcing portion, and the first direction is perpendicular to the thickness direction.

In the technical scheme, the reinforcing parts are arranged on the two sides of the convex part along the first direction, so that the strength and the rigidity of the end cover are enhanced, the shock resistance of the end cover is improved, the deformation of the end cover is smaller when the end cover is impacted, and the problem that the electrode assembly is damaged due to deformation of the end cover is solved.

As an optional technical solution of the embodiment of the present application, the first direction is a length direction of the end cap.

In above-mentioned technical scheme, compare in the width direction of end cover, the length direction of end cover is changeed because of receiving the impact and is out of shape, all sets up the rib through the length direction's of convex part both sides, strengthens the length direction's of end cover shock resistance to alleviate the end cover and warp the problem of damage electrode subassembly.

As an optional technical scheme of the embodiment of the application, the end cover assembly comprises a pressure relief mechanism, the pressure relief mechanism is arranged on the end cover, and along the thickness direction, the pressure relief mechanism and the projection of the reinforcing part on the end cover are not overlapped.

In the technical scheme, the pressure relief mechanism can be opened when the internal pressure of the battery monomer reaches the detonation pressure so as to release the internal pressure of the battery monomer. The projections of the pressure relief mechanism and the reinforcing part on the end cover along the thickness direction are not overlapped, so that the pressure relief mechanism and the reinforcing part are not interfered with each other, and the reinforcing part is prevented from influencing the pressure relief function of the pressure relief mechanism.

As an alternative to the embodiment of the present application, the reinforcing portion is a continuous structure disposed along a circumferential direction of the groove.

In above-mentioned technical scheme, set up the reinforcement into the continuous structure that sets up along recess circumference, the wholeness of reinforcement is better, and it is better to strengthen the effect.

As an optional technical solution of the embodiment of the present application, the reinforcing portion is a discontinuous structure disposed along a circumferential direction of the groove.

In the technical scheme, the reinforcing part is arranged to be of a discontinuous structure arranged along the circumferential direction of the groove, so that the reinforcing part can avoid other parts and cannot interfere with other parts.

As an optional solution of the embodiment of the present application, the reinforcement portion includes a plurality of reinforcement segments, and the plurality of reinforcement segments are arranged at intervals along the circumferential direction.

In above-mentioned technical scheme, through setting up a plurality of reinforcement sections, when a plurality of reinforcement sections strengthen end cover intensity and rigidity, can also dodge free other parts of battery, avoid interfering with other parts mutually. In addition, the plurality of reinforcement segments are lighter in weight than a continuous structure, facilitating increased strength and stiffness without substantially increasing the weight of the end cap assembly.

As an optional technical solution of the embodiment of the present application, the end cover assembly includes a plurality of the grooves, and the reinforcing portions correspond to the grooves one to one.

In above-mentioned technical scheme, through setting up a plurality of rib and a plurality of recess, promote the enhancement effect to end cover intensity and rigidity.

As an optional solution of the embodiment of the present application, the end cap assembly includes a plurality of the reinforcement portions, and the plurality of the reinforcement portions are all disposed around the groove.

In the technical scheme, the plurality of reinforcing parts are arranged corresponding to the groove, so that the reinforcing effect on the strength and the rigidity of the end cover can be improved, and the deformation of the end cover when being impacted externally is smaller or does not occur.

As an alternative to the embodiment of the present application, the end cap assembly includes a plurality of the grooves, and the reinforcement portion is disposed around the plurality of the grooves.

In the technical scheme, the plurality of grooves correspond to the reinforcing part, so that the weight of the end cover can be reduced, and the weight difference of the front end cover and the rear end cover of the reinforcing part is not large or the same.

In a second aspect, an embodiment of the present application further provides a battery cell, where the battery cell includes an electrode assembly, a case, and the above end cap assembly; the case has an accommodation space having one end opened for accommodating the electrode assembly; the end cap is connected to the housing and closes the opening.

As an optional feature of the embodiments of the present application, the first surface faces the electrode assembly, the end cap assembly includes an insulating member disposed between the end cap and the electrode assembly, and the reinforcing portion abuts against the insulating member.

In the technical scheme, the insulating piece is arranged between the end cover and the electrode assembly to insulate and separate the end cover and the electrode assembly, so that the end cover and the electrode assembly are prevented from contacting to cause short circuit. The reinforcing part is abutted to the insulating part, and when the end cover is impacted, the insulating part can also play a role in buffering and reducing pressure, so that the deformation of the end cover is smaller, and the problem that the end cover deforms to damage the electrode assembly is solved.

In a third aspect, an embodiment of the present application further provides a battery, where the battery includes a box body and the above battery cell, and the battery cell is accommodated in the box body.

As an optional technical solution of the embodiment of the present application, the end cover is disposed on one side of the battery cell close to the bottom wall of the box body.

In the technical scheme, the end cover is arranged on one side of the bottom wall, close to the box body, of the battery monomer, namely, the battery monomer is placed in the box body in an inverted mode.

In a fourth aspect, an embodiment of the present application further provides an electric device, where the electric device includes the above battery, and the battery is used to provide electric energy.

Drawings

To more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.

FIG. 1 is a schematic illustration of a vehicle according to some embodiments of the present application;

fig. 2 is an exploded view of a battery provided in accordance with some embodiments of the present application;

fig. 3 is an exploded schematic view of a battery cell according to some embodiments of the present disclosure;

FIG. 4 is a schematic structural view of an end cap assembly provided in accordance with certain embodiments of the present application;

FIG. 5 is a schematic bottom view of an endcap assembly provided in accordance with some embodiments of the present application;

FIG. 6 is a schematic top view of an endcap assembly according to some embodiments of the present application;

FIG. 7 isbase:Sub>A cross-sectional view taken at location A-A of FIG. 6;

FIG. 8 is an enlarged view of position B of FIG. 7;

FIG. 9 is a schematic illustration of an end cap assembly according to further embodiments of the present application;

FIG. 10 is a schematic bottom view of an endcap assembly in accordance with other embodiments of the present application;

FIG. 11 is a schematic top view of an endcap assembly according to other embodiments of the present application;

FIG. 12 is a cross-sectional view taken at position D-D of FIG. 11;

FIG. 13 is a schematic bottom view of an end cap assembly (reinforcement including a plurality of reinforcement segments) provided in accordance with certain embodiments of the present application;

FIG. 14 is a schematic bottom view of an endcap assembly (with one groove for each reinforcement portion) according to some embodiments of the present application;

FIG. 15 is a schematic bottom view of an endcap assembly (with one reinforcement portion corresponding to a plurality of grooves) provided in accordance with some embodiments of the present application.

An icon: 10-a box body; 11-a first part; 12-a second part; 20-a battery cell; 21-an end cap assembly; 211-end cap; 2111-first surface; 2112-a second surface; 2113-mounting holes; 2114-relief vent; 212-a groove; 213-reinforcement; 2131-a reinforcement section; 214-electrode terminals; 215-a pressure relief mechanism; 216-a convex portion; 217-recess; 22-an electrode assembly; 23-a housing; 100-a battery; 200-a controller; 300-a motor; 1000-vehicle.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Unless defined otherwise, 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 in the description of the application in the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "including" and "having," and any variations thereof, in the description and claims of this application and the description of the above figures are intended to cover non-exclusive inclusions. The terms "first," "second," and the like in the description and claims of this application or in the foregoing drawings are used for distinguishing between different elements and not for describing a particular sequential or chronological order.

Reference in the specification 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 specification. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "attached" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as the case may be.

The term "and/or" in this application is only one kind of association relationship describing the associated object, and means that there may be three kinds of relationships, for example, a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" in this application generally indicates that the former and latter related objects are in an "or" relationship.

In the embodiments of the present application, like reference numerals denote like components, and in the different embodiments, detailed descriptions of the like components are omitted for the sake of brevity. It should be understood that the thickness, length, width and other dimensions of the various components in the embodiments of the present application and the overall thickness, length, width and other dimensions of the integrated device shown in the drawings are only exemplary and should not constitute any limitation to the present application.

The appearances of "a plurality" in this application are intended to mean more than two (including two).

In this application, the battery cell may include a lithium ion secondary battery cell, a lithium ion primary battery cell, a lithium sulfur battery cell, a sodium lithium ion battery cell, a sodium ion battery cell, or a magnesium ion battery cell, and the embodiment of the present application is not limited thereto. The battery cell may be a cylinder, a flat body, a rectangular parallelepiped, or other shapes, which is not limited in the embodiments of the present application. The battery cells are generally divided into three types in a packaging manner: the single battery of cylindricality battery, square battery monomer and laminate polymer battery monomer, this application embodiment is to this also not limited.

Reference to a battery in embodiments of the present application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in the present application may include a battery module or a battery pack, etc. Batteries generally include a case for enclosing one or more battery cells. The box can avoid liquid or other foreign matters to influence the charge or discharge of battery cells.

The battery monomer comprises an electrode assembly and electrolyte, wherein the electrode assembly comprises a positive plate, a negative plate and an isolating membrane. The battery cell mainly depends on metal ions moving between the positive plate and the negative plate to work. The positive plate comprises a positive current collector and a positive active substance layer, wherein the positive active substance layer is coated on the surface of the positive current collector, the positive current collector which is not coated with the positive active substance layer protrudes out of the positive current collector which is coated with the positive active substance layer, and the positive current collector which is not coated with the positive active substance layer is used as a positive lug. Taking a lithium ion battery as an example, the material of the positive electrode current collector may be aluminum, and the positive electrode active material may be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate, or the like. The negative pole piece includes negative pole mass flow body and negative pole active substance layer, and the surface of negative pole mass flow body is scribbled to the negative pole active substance layer, and the negative pole mass flow body protrusion in the negative pole mass flow body of having scribbled the negative pole active substance layer of not scribbling the negative pole active substance layer, and the negative pole mass flow body of not scribbling the negative pole active substance layer is as negative pole ear. The material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon, silicon, or the like. In order to ensure that the fuse is not fused when a large current is passed, a plurality of positive electrode tabs are stacked, and a plurality of negative electrode tabs are stacked. The material of the isolation film may be PP (polypropylene) or PE (polyethylene). In addition, the electrode assembly may have a winding structure or a lamination structure, and the embodiment of the present application is not limited thereto.

At present, the application of the battery is more and more extensive from the development of market situation. The battery is not only applied to energy storage power supply systems such as hydraulic power, firepower, wind power and solar power stations, but also widely applied to electric vehicles such as electric bicycles, electric motorcycles, electric automobiles and the like, and a plurality of fields such as military equipment and aerospace. As the field of application of batteries is continuously expanded, the market demand thereof is also continuously expanded.

The battery cell comprises an end cover, an electrode assembly and a shell, wherein the end cover and the shell are matched to form an internal environment of the battery cell, and the electrode assembly is accommodated in the internal environment. However, in the cell-inverted scenario, damage often occurs to the electrode assembly, resulting in cell failure.

The inventor further researches and discovers that the end cover is easier to deform due to external impact in the scene of inversion of the battery core, and the deformation of the end cover easily causes the stress of the electrode assembly to deform, so that the electrode assembly is damaged, and the single battery fails.

In view of this, the present application provides an end cap assembly that includes an end cap, a groove, and a reinforcement. The end cap has a first surface and a second surface which are oppositely arranged along the thickness direction of the end cap, and the groove is sunken from the first surface to the direction close to the second surface. The reinforcing part is convexly arranged on the first surface and/or the second surface and is arranged around the groove.

According to the end cover assembly, the reinforcing part is arranged on the end cover, so that the strength and rigidity of the end cover are enhanced, the shock resistance of the end cover is improved, the deformation of the end cover is smaller when the end cover is impacted, and the problem that the electrode assembly is damaged due to the deformation of the end cover is solved. In addition, the end cover assembly reduces the weight of the end cover by arranging the groove on the end cover, so that the weight of the front end cover and the weight of the rear end cover which are provided with the reinforcing parts are not different or the same. By arranging the reinforcement part around the groove, the rigidity and strength of the position where the groove is arranged can be reinforced, and the strength and rigidity of the end cover assembly can be improved without greatly increasing the weight of the end cover assembly.

The technical scheme described in the embodiment of the application is suitable for the battery and the electric equipment using the battery.

The electric equipment can be vehicles, mobile phones, portable equipment, notebook computers, ships, spacecrafts, electric toys, electric tools and the like. Spacecraft include aircraft, rockets, space shuttles, and spacecraft, among others; electric toys include stationary or mobile electric toys, such as game machines, electric car toys, electric ship toys, electric airplane toys, and the like; the electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools, and electric tools for railways, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, electric impact drills, concrete vibrators, and electric planers. The embodiment of the present application does not specifically limit the above-mentioned electric devices.

For convenience of description, the following embodiments will be described by taking an electric device as the vehicle 1000.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a vehicle 1000 according to some embodiments of the present disclosure. The vehicle 1000 may be a fuel automobile, a gas automobile, or a new energy automobile, and the new energy automobile may be a pure electric automobile, a hybrid electric automobile, or a range-extended automobile, etc. The battery 100 is provided inside the vehicle 1000, and the battery 100 may be provided at the bottom or the head or the tail of the vehicle 1000. The battery 100 may be used for power supply of the vehicle 1000, for example, the battery 100 may serve as an operation power source of the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300, the controller 200 being configured to control the battery 100 to supply power to the motor 300, for example, for power requirements for operation during starting, navigation, and traveling of the vehicle 1000.

In some embodiments of the present application, the battery 100 may be used not only as an operating power source of the vehicle 1000, but also as a driving power source of the vehicle 1000, instead of or in part of fuel or natural gas, to provide driving power for the vehicle 1000.

Referring to fig. 2, fig. 2 is an exploded view of a battery 100 according to some embodiments of the present disclosure. The battery 100 includes a case 10 and a battery cell 20, and the battery cell 20 is accommodated in the case 10. The case 10 is used to provide a receiving space for the battery cell 20, and the case 10 may have various structures. In some embodiments, the case 10 may include a first portion 11 and a second portion 12, the first portion 11 and the second portion 12 cover each other, and the first portion 11 and the second portion 12 together define a receiving space for receiving the battery cell 20. The second part 12 may be a hollow structure with one open end, the first part 11 may be a plate-shaped structure, and the first part 11 covers the open side of the second part 12, so that the first part 11 and the second part 12 jointly define a containing space; the first portion 11 and the second portion 12 may be both hollow structures with one side open, and the open side of the first portion 11 may cover the open side of the second portion 12. Of course, the case 10 formed by the first and second portions 11 and 12 may have various shapes, such as a cylinder, a rectangular parallelepiped, and the like.

In the battery 100, the number of the battery cells 20 may be multiple, and the multiple battery cells 20 may be connected in series or in parallel or in series-parallel, where in series-parallel refers to both series connection and parallel connection among the multiple battery cells 20. The plurality of battery cells 20 can be directly connected in series or in parallel or in series-parallel, and the whole formed by the plurality of battery cells 20 is accommodated in the box body 10; of course, the battery 100 may also be formed by connecting a plurality of battery cells 20 in series, in parallel, or in series-parallel to form a battery module, and then connecting a plurality of battery modules in series, in parallel, or in series-parallel to form a whole, and accommodating the whole in the case 10. The battery 100 may further include other structures, for example, the battery 100 may further include a bus member for achieving electrical connection between the plurality of battery cells 20.

Wherein, each battery cell 20 may be a secondary battery cell or a primary battery cell; but not limited thereto, a lithium sulfur battery cell, a sodium ion battery cell, or a magnesium ion battery cell may also be used. The battery cell 20 may be cylindrical, flat, rectangular parallelepiped, or other shape.

Referring to fig. 3, fig. 3 is an exploded schematic view of a battery cell 20 according to some embodiments of the present disclosure. The battery cell 20 refers to the smallest unit constituting the battery 100. As shown in fig. 3, the battery cell 20 includes an end cap assembly 21, an electrode assembly 22, and a case 23.

The cap assembly 21 includes a cap 211, an electrode terminal 214, and a pressure relief mechanism 215. The end cap 211 is a member covering the opening of the case 23 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the end cap 211 may be adapted to the shape of the housing 23 to fit the housing 23. Alternatively, the end cap 211 may be made of a material (e.g., an aluminum alloy) having a certain hardness and strength, so that the end cap 211 is not easily deformed when being impacted, and thus the battery cell 20 may have a higher structural strength and the safety performance may be improved. The material of the end cap 211 may also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not limited in this application. The electrode terminal 214 is provided at the end cap 211. The electrode terminal 214 may be used to electrically connect with the electrode assembly 22 for outputting or inputting electric energy of the battery cell 20. A pressure relief mechanism 215 is disposed at the end cap 211, and the pressure relief mechanism 215 is configured to open when the internal pressure or temperature of the battery cell 20 reaches the initiation pressure, so as to relieve the internal pressure of the battery cell 20. In some embodiments, the end cap assembly 21 further comprises an insulator disposed inside the end cap 211, which may be used to isolate the electrical connection components within the housing 23 from the end cap 211 to reduce the risk of shorting. Illustratively, the insulator may be plastic, rubber, or the like.

The case 23 is an assembly for mating with the end cap 211 to form an internal environment of the battery cell 20, wherein the formed internal environment may be used to house the electrode assembly 22, electrolyte, and other components. The housing 23 and the end cap 211 may be separate components, and an opening may be provided in the housing 23, and the opening may be covered by the end cap 211 to form the internal environment of the battery cell 20. Without limitation, the end cap 211 and the housing 23 may be integrated, and specifically, the end cap 211 and the housing 23 may form a common connecting surface before other components are inserted into the housing, and when it is necessary to enclose the inside of the housing 23, the end cap 211 covers the housing 23. The housing 23 may be of various shapes and various sizes, such as rectangular parallelepiped, cylindrical, hexagonal prism, etc. Specifically, the shape of the case 23 may be determined according to the specific shape and size of the electrode assembly 22. The material of the housing 23 may be various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not limited in this embodiment.

The electrode assembly 22 is a component of the battery cell 20 in which electrochemical reactions occur. One or more electrode assemblies 22 may be contained within the case 23. The electrode assembly 22 is mainly formed by winding or stacking 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 portions of the positive and negative electrode sheets having the active material constitute the body portion of the electrode assembly 22, and the portions of the positive and negative electrode sheets having no active material each constitute a tab. The positive electrode tab and the negative electrode tab may be located at one end of the main body portion together or at both ends of the main body portion, respectively. During the charge and discharge of the battery 100, the positive and negative active materials react with the electrolyte, and the tabs are connected to the electrode terminals 214 to form a current loop.

Referring to fig. 4, 5, 6, 7 and 8, fig. 4 is a schematic structural view of an end cap assembly 21 according to some embodiments of the present disclosure. Fig. 5 is a schematic bottom view of an endcap assembly 21 according to some embodiments of the present application. Fig. 6 is a schematic top view of an end cap assembly 21 provided in some embodiments of the present application. Fig. 7 isbase:Sub>A cross-sectional view taken atbase:Sub>A-base:Sub>A in fig. 6. Fig. 8 is an enlarged view of the position B in fig. 7. The embodiment of the application provides an end cover assembly 21, and the end cover assembly 21 comprises an end cover 211, a groove 212 and a reinforcing part 213. The end cap 211 has a first surface 2111 and a second surface 2112 which are oppositely disposed in a thickness direction thereof, and the groove 212 is recessed from the first surface 2111 in a direction close to the second surface 2112. The reinforced portion 213 protrudes from the first surface 2111 and/or the second surface 2112 and is disposed around the groove 212.

The thickness direction is the direction indicated by a double-headed arrow C in fig. 8.

The first surface 2111 and the second surface 2112 are two surfaces that are oppositely disposed in the thickness direction of the end cover 211. One of the first surface 2111 and the second surface 2112 is an inner surface of the end cap 211, and the other is an outer surface of the end cap 211. Where the inner surface refers to the surface of the end cap 211 facing the interior of the housing 23 and the outer surface refers to the surface of the end cap 211 facing away from the housing 23. When the first surface 2111 is an inner surface, the second surface 2112 is an outer surface. When the second surface 2112 is an outer surface, the first surface 2111 is an inner surface.

The groove 212 refers to a channel-like structure that extends through the first surface 2111 of the end cap 211 and in a direction from the first surface 2111 toward the second surface 2112. The shape of the groove 212 is not limited, and for example, the groove 212 may be rectangular or circular.

The reinforcing portion 213 is a protrusion protruding from the end cap 211. The reinforcing portion 213 may be provided to protrude from the first surface 2111, or may be provided to protrude from the second surface 2112. When the reinforcing portion 213 is protruded from the first surface 2111, the reinforcing portion 213 and the groove 212 are located on the same side of the end cap 211. When the reinforcing portion 213 is protruded from the second surface 2112, the reinforcing portion 213 and the groove 212 are located on both sides of the end cap 211.

"the reinforcement 213 is disposed around the groove 212" includes both the reinforcement 213 disposed half-way around the groove 212 and the reinforcement 213 disposed completely around the groove 212. The inner surface of the reinforcement 213 and the inner wall of the groove 212 may be disposed coplanar, e.g., the inner surface of the reinforcement 213 is flush with the inner wall of the groove 212. The inner surface of the reinforcement 213 and the inner wall of the groove 212 may also be disposed non-coplanar, for example, with a space between the inner wall of the reinforcement 213 and the inner wall of the groove 212 along the length of the end cap 211.

The reinforcement 213 may be in various shapes. For example, the reinforcement 213 encloses a racetrack or rectangle, in which case the reinforcement 213 is disposed completely around the recess 212. As another example, the reinforcement 213 is a U-shaped protrusion extending along a U-shaped trajectory, in which case the reinforcement 213 is disposed half-way around the groove 212.

In the end cap assembly 21, the reinforcing part 213 is arranged on the end cap 211, so that the strength and rigidity of the end cap 211 are enhanced, the impact resistance of the end cap 211 is improved, the deformation amount of the end cap 211 when being impacted is smaller, and the problem that the electrode assembly 22 is damaged by the deformation of the end cap 211 is solved. In addition, the end cap assembly 21 reduces the weight of the end cap 211 by providing the groove 212 on the end cap 211, so that the weight of the end cap 211 is not different or the same before and after providing the reinforcement 213. By disposing the reinforcement portion 213 around the groove 212, the rigidity and strength of the position where the groove 212 is disposed can be reinforced, and the strength and rigidity thereof can be enhanced without greatly increasing the weight of the head cover assembly 21.

In some embodiments, the end cap 211 is provided with a mounting hole 2113 and a pressure relief hole 2114, wherein the mounting hole 2113 is used for mounting the electrode terminal 214, and the pressure relief hole 2114 is used for providing the pressure relief mechanism 215.

In some embodiments, a distance D between the first surface 2111 and the second surface 2112 in the thickness direction, and a distance D between the bottom surface of the groove 212 and the first surface 2111 satisfy: D/D is more than or equal to 0.1 and less than or equal to 0.6.

The distance between the first surface 2111 and the second surface 2112 in the thickness direction may also be understood as the thickness of the end cap 211. The distance in the thickness direction of the bottom surface of the groove 212 from the first surface 2111 may also be understood as the depth of the groove 212. D/D is more than or equal to 0.1 and less than or equal to 0.6, namely the depth of the groove 212 is 0.1-0.6 times of the thickness of the end cover 211.

It should be noted that the dotted line shown in fig. 8 is in the same plane as the first surface 2111, and the range of the groove 212 is the portion enclosed by the bottom wall, the side wall, and the dotted line of the groove 212 in fig. 8. The dashed lines are for ease of indicating the actual extent of the recess 212 and for ease of identifying the distance d of the bottom surface of the recess 212 from the first surface 2111, and the dashed lines do not indicate actual physical features.

By setting the depth of the groove 212 to be 0.1 to 0.6 times the thickness of the end cap 211, a better weight reduction effect is achieved, and the strength of the end cap 211 cannot be greatly weakened. If D/D is less than 0.1, the depth of the groove 212 is shallow, and the weight reduction effect is poor. If D/D > 0.6, the depth of the groove 212 is large, the strength of the end cap 211 is weakened more, so that the strength of the end cap 211 is poor even if the reinforcing portion 213 is provided.

Referring to fig. 9, 10, 11 and 12, fig. 9 is a schematic structural view of an end cap assembly 21 according to another embodiment of the present disclosure. FIG. 10 is a schematic bottom view of an endcap assembly 21 in accordance with other embodiments of the present application. FIG. 11 is a schematic top view of an endcap assembly 21 in accordance with other embodiments of the present application. Fig. 12 is a cross-sectional view taken at position D-D in fig. 11. In other embodiments, the end cap 211 is provided with a protrusion 216 and a recess 217, the protrusion 216 is protruded from the second surface 2112, the recess 217 is recessed from the first surface 2111 in a direction close to the second surface 2112, and the recess 217 is disposed corresponding to the protrusion 216. Projections of the convex portion 216 and the reinforcing portion 213 on the end cover 211 do not overlap in the thickness direction.

The convex portion 216 is a convex structure protruding from the second surface 2112. The recess 217 refers to a slot-type structure that extends through the first surface 2111 of the end cap 211 and in a direction from the first surface 2111 toward the second surface 2112.

"the concave portion 217 is provided corresponding to the convex portion 216" means that a projection of the contour of the groove 212 on the end cover 211 completely falls on a projection range of the convex portion 216 on the end cover 211, or a projection of the convex portion 216 on the end cover 211 completely falls on a projection range of the contour of the groove 212 on the end cover 211, along the thickness direction. In some embodiments, the projection of the contour of the groove 212 on the end cap 211 completely overlaps the projection of the protrusion 216 on the end cap 211.

In some embodiments, the recess 217 extends through the second surface 2112 and into the protrusion 216.

"projections of the convex portions 216 and the reinforcing portions 213 on the end cover 211 in the thickness direction do not overlap" that is, the reinforcing portions 213 and the convex portions 216 are disposed at intervals or offset in a plane perpendicular to the thickness direction.

By forming the convex portion 216 on the second surface 2112 and forming the concave portion 217 on the first surface 2111 at a position corresponding to the convex portion 216, on the one hand, the concave portion 217 can accommodate components inside the battery cell 20, which is beneficial to improving the energy density of the battery cell 20. On the other hand, the convex portions 216 can increase the bending strength of the end cap 211 and improve the impact resistance of the end cap 211. Projections of the convex portions 216 and the reinforcing portions 213 on the end cap 211 in the thickness direction do not overlap to reinforce the strength and rigidity of the end cap 211 at different positions, respectively, and improve the impact resistance of the end cap 211 to alleviate the problem that the end cap 211 deforms to damage the electrode assembly 22.

In some embodiments, the end cap assembly 21 includes an electrode terminal 214, the electrode terminal 214 being disposed at the protrusion 216.

The electrode terminal 214 is a member for electrical connection with the electrode assembly 22 to output or input electrical energy of the battery cell 20. The protrusion 216 has a mounting hole 2113 formed therein, and the electrode terminal 214 is partially inserted into the mounting hole 2113.

The electrode terminal 214 may be electrically connected to the electrode assembly 22 in the battery cell 20, and the electrode terminal 214 is disposed on the protruding portion 216 so as to partially accommodate the electrode assembly 22 in the recessed portion 217, which is beneficial to increase the energy density of the battery cell 20. In addition, since the position of the convex portion 216 has a strong impact resistance, the electrode terminal 214 is provided thereto, and the electrode terminal 214 is not easily damaged by deformation of the end cap 211.

In some embodiments, both sides of the convex portion 216 are provided with the reinforcing portions 213 along a first direction, which is perpendicular to the thickness direction.

The first direction is an arbitrary direction perpendicular to the thickness direction. For example, the first direction may be a longitudinal direction of the end cap 211, and the first direction may be a width direction of the end cap 211. In the present embodiment, the first direction is an E direction indicated by a double arrow in fig. 10.

By "the reinforcing portions 213 are provided on both sides of the convex portion 216", it is meant that the end cover assembly 21 includes a plurality of reinforcing portions 213, and the plurality of reinforcing portions 213 are provided on both sides of the convex portion 216 in the first direction, respectively.

By providing the reinforcing portions 213 on both sides of the protruding portion 216 in the first direction, the strength and rigidity of the end cap 211 are enhanced, the impact resistance of the end cap 211 is improved, and the amount of deformation of the end cap 211 when the end cap 211 is impacted is reduced, so as to alleviate the problem that the end cap 211 deforms and damages the electrode assembly 22.

In some embodiments, the first direction is the length direction of the end cap 211.

The length direction of the end cap 211 is more easily deformed by impact than the width direction of the end cap 211, and the impact resistance of the end cap 211 in the length direction is enhanced by providing the reinforcing parts 213 on both sides of the protrusion 216 in the length direction to alleviate the problem that the end cap 211 deforms to damage the electrode assembly 22.

In some embodiments, the end cap assembly 21 includes a pressure relief mechanism 215, and the pressure relief mechanism 215 is disposed in the end cap 211. In the thickness direction, the projections of the pressure relief mechanism 215 and the reinforcement portion 213 on the end cap 211 do not overlap.

The pressure relief mechanism 215 can be opened when the internal pressure of the battery cell 20 reaches the priming pressure to relieve the internal pressure of the battery cell 20.

"the projections of the pressure relief mechanism 215 and the reinforcing portion 213 on the end cap 211 in the thickness direction do not overlap", that is, the pressure relief mechanism 215 and the reinforcing portion 213 are spaced apart or offset in a plane perpendicular to the thickness direction.

By making the projections of the pressure relief mechanism 215 and the reinforcement portion 213 on the end cap 211 in the thickness direction not overlap, the pressure relief mechanism 215 and the reinforcement portion 213 do not interfere with each other, and the reinforcement portion 213 is prevented from affecting the pressure relief function of the pressure relief mechanism 215.

In some embodiments, the reinforcement 213 is a continuous structure disposed along the circumference of the groove 212.

The "reinforcing portion 213 is a continuous structure disposed along the circumferential direction of the groove 212" may also be understood as the reinforcing portion 213 is a closed structure extending along a closed track, and the reinforcing portion 213 is disposed around the groove 212. The closed track is a track with two ends connected end to end, such as a rectangular track, an elliptical track and the like. In some embodiments, the reinforcement 213 is a racetrack-shaped raised structure. In other embodiments, the reinforcement 213 is a rectangular protrusion.

The reinforcement 213 is provided as a continuous structure along the circumferential direction of the groove 212, so that the reinforcement 213 has better integrity and better reinforcement effect.

Referring to fig. 13, fig. 13 is a bottom view of the end cap assembly 21 (the reinforcing portion 213 includes a plurality of reinforcing segments 2131) according to some embodiments of the disclosure. In some embodiments, the reinforcement 213 is a discontinuous structure disposed along the circumference of the groove 212.

The "reinforcement 213 is a discontinuous structure disposed along the circumferential direction of the groove 212" may be understood as the reinforcement 213 includes a plurality of portions, which are disposed around the groove 212.

The reinforcement 213 is provided as a discontinuous structure provided along the circumferential direction of the groove 212 so that the reinforcement 213 can escape from other components without interfering with the other components.

Referring to fig. 13, in some embodiments, the reinforcing portion 213 includes a plurality of reinforcing segments 2131, and the plurality of reinforcing segments 2131 are arranged at intervals in the circumferential direction.

The reinforcing segment 2131 is a part of the reinforcing portion 213, and a plurality of reinforcing segments 2131 form the reinforcing portion 213, and the reinforcing segments 2131 are located around the groove 212.

By providing the plurality of reinforcement segments 2131, the plurality of reinforcement segments 2131 can avoid other parts of the battery cell 20 and avoid interference with other parts while enhancing the strength and rigidity of the end cap 211. In addition, the plurality of reinforcement segments 2131 are lighter in weight than a continuous structure, which facilitates increasing the strength and stiffness of the end cap assembly 21 without substantially increasing its weight.

In some embodiments, the end cap assembly 21 includes a plurality of grooves 212, and the reinforcements 213 correspond one-to-one to the grooves 212.

The phrase "the reinforcing parts 213 correspond to the grooves 212 one to one" means that the reinforcing parts 213 are in one-to-one relationship with the grooves 212. A reinforcement 213 is correspondingly provided around one of the grooves 212.

By providing the plurality of reinforcing portions 213 and the plurality of grooves 212, the reinforcing effect on the strength and rigidity of the end cover 211 is improved.

Referring to fig. 14, fig. 14 is a bottom view of the endcap assembly 21 (with a plurality of reinforcements 213 corresponding to a groove 212) according to some embodiments of the present disclosure. In some embodiments, the end cap assembly 21 includes a plurality of reinforcements 213, each of the plurality of reinforcements 213 disposed about the groove 212.

The reinforcing portions 213 and the grooves 212 are in a many-to-one relationship, and the plurality of reinforcing portions 213 surround the same groove 212. As shown in fig. 14, two reinforcing portions 213 are provided to surround one groove 212 in common.

Through setting up a plurality of reinforcing parts 213, a plurality of reinforcing parts 213 correspond a recess 212 setting, can promote the reinforcing effect to the intensity and the rigidity of end cover 211, make the deformation of end cover 211 when receiving external impact less or not take place deformation.

Referring to fig. 15, fig. 15 is a bottom view of an end cap assembly 21 (a plurality of grooves 212 corresponding to one reinforcing portion 213) according to some embodiments of the present disclosure. In some embodiments, the end cap assembly 21 includes a plurality of grooves 212, and the reinforcement 213 is disposed around the plurality of grooves 212.

The grooves 212 and the reinforcing portions 213 are in a many-to-one relationship, and one reinforcing portion 213 surrounds a plurality of the grooves 212. As shown in fig. 15, one reinforcing portion 213 surrounds two grooves 212.

By providing a plurality of grooves 212, the plurality of grooves 212 corresponding to one reinforcing portion 213, the weight of the end cover 211 can be reduced, so that the weight of the end cover 211 is not different or the same before and after the reinforcing portion 213 is provided.

The embodiment of the present application further provides a battery cell 20, where the battery cell 20 includes an electrode assembly 22, a case 23, and the above-mentioned end cap assembly 21. The case 23 has an accommodation space with one end open for accommodating the electrode assembly 22. The end cap 211 is attached to the housing 23 and closes the opening.

In some embodiments, first surface 2111 faces electrode assembly 22, and end cap assembly 21 includes an insulator disposed between end cap 211 and electrode assembly 22. The reinforcement portion 213 abuts on the insulator.

By "first surface 2111 faces electrode assembly 22," it is meant that first surface 2111 is the inner surface of end cap 211.

The insulating member is made of a material having insulating properties, such as plastic or rubber. The insulating member serves to insulate the end cap 211 and the electrode assembly 22 from each other, and prevent the end cap 211 from being electrically connected to the electrode assembly 22, which may cause a short circuit of the battery cell 20.

By providing an insulating member between end cap 211 and electrode assembly 22 to insulate and isolate end cap 211 from electrode assembly 22, end cap 211 and electrode assembly 22 are prevented from contacting and shorting out. When the reinforcing portion 213 abuts against the insulating member, the insulating member can also have a cushioning effect when the end cap 211 receives an impact, so that the end cap 211 is less deformed, and the problem that the end cap 211 is deformed to damage the electrode assembly 22 is alleviated.

The embodiment of the present application further provides a battery 100, where the battery 100 includes a box 10 and the single battery 20, and the single battery 20 is accommodated in the box 10.

In some embodiments, the end cap 211 is disposed on a side of the battery cell 20 near the bottom wall of the case 10.

The bottom wall of the casing 10 is a wall surface of the casing 10 opposite to the open end of the casing 10.

The battery cell 20 is placed upside down in the case 10 by disposing the end cap 211 on the side of the battery cell 20 close to the bottom wall of the case 10.

The embodiment of the present application further provides an electric device, where the electric device includes the above battery 100, and the battery 100 is used for providing electric energy.

Please refer to fig. 4-8 according to some embodiments of the present application.

The embodiment of the application provides an end cover assembly 21, and the end cover assembly 21 comprises an end cover 211, a groove 212 and a reinforcing part 213. The end cap 211 has a first surface 2111 and a second surface 2112 which are oppositely disposed in a thickness direction thereof, and the groove 212 is recessed from the first surface 2111 in a direction close to the second surface 2112. The reinforcement portion 213 is protruded from the first surface 2111 and disposed around the groove 212. In the thickness direction, the distance between the first surface 2111 and the second surface 2112 is D, and the distance between the bottom surface of the groove 212 and the first surface 2111 is D, which satisfies: D/D is more than or equal to 0.1 and less than or equal to 0.6.

The end cover 211 is provided with a convex portion 216 and a concave portion 217, the convex portion 216 is provided to protrude from the second surface 2112, the concave portion 217 is recessed from the first surface 2111 in a direction close to the second surface 2112, and the concave portion 217 is provided corresponding to the convex portion 216. Projections of the convex portion 216 and the reinforcing portion 213 on the end cover 211 do not overlap in the thickness direction. The reinforcing parts 213 are provided on both sides of the convex part 216 in the length direction of the end cap 211.

In the end cap assembly 21, the reinforcing part 213 is arranged on the end cap 211, so that the strength and rigidity of the end cap 211 are enhanced, the impact resistance of the end cap 211 is improved, the deformation amount of the end cap 211 when being impacted is smaller, and the problem that the end cap 211 deforms to damage the electrode assembly 22 is solved. In addition, the end cap assembly 21 reduces the weight of the end cap 211 by providing the groove 212 on the end cap 211, so that the weight of the end cap 211 is not different or the same before and after providing the reinforcement 213. By disposing the reinforcement portion 213 around the groove 212, the rigidity and strength of the position where the groove 212 is disposed can be reinforced, and the strength and rigidity thereof can be enhanced without greatly increasing the weight of the head cover assembly 21. The distance between the first surface 2111 and the second surface 2112 in the thickness direction may also be understood as the thickness of the end cap 211. The distance in the thickness direction of the bottom surface of the groove 212 from the first surface 2111 may also be understood as the depth of the groove 212. The depth of the groove 212 is 0.1 to 0.6 times the thickness of the end cap 211. Thus, the end cover 211 has a good weight reduction effect, and the strength of the end cover 211 is not greatly weakened. If D/D is less than 0.1, the depth of the groove 212 is shallow, and the weight reduction effect is poor. If D/D > 0.6, the depth of the groove 212 is large, the strength of the end cap 211 is weakened more, so that the strength of the end cap 211 is poor even if the reinforcing portion 213 is provided.

By forming the convex portion 216 on the second surface 2112 and forming the concave portion 217 at the position of the first surface 2111 corresponding to the convex portion 216, on the one hand, the concave portion 217 can accommodate the components inside the battery cell 20, which is beneficial to improving the energy density of the battery cell 20, and on the other hand, the convex portion 216 can improve the bending strength of the end cap 211 and improve the impact resistance of the end cap 211. The projections of the reinforcing part 213 and the convex part 216 on the end cover 211 along the thickness direction do not overlap, that is, the reinforcing part 213 and the convex part 216 are arranged at intervals or staggered on the surface of the end cover 211, so as to respectively reinforce the strength and rigidity of different positions of the end cover 211, and improve the impact resistance of the end cover 211, so as to alleviate the problem that the end cover 211 deforms and damages the electrode assembly 22. The reinforcing parts 213 are arranged on the two sides of the convex part 216 along the length direction of the end cover 211, so that the strength and the rigidity of the end cover 211 are enhanced, the shock resistance of the end cover 211 is improved, the deformation amount of the end cover 211 when being impacted is smaller, and the problem that the electrode assembly 22 is damaged due to the deformation of the end cover 211 is solved.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (18)

1. An end cap assembly, comprising:

an end cap having a first surface and a second surface oppositely disposed in a thickness direction thereof;

a groove recessed from the first surface in a direction close to the second surface;

and the reinforcing part is convexly arranged on the first surface and/or the second surface and is arranged around the groove.

2. The end cap assembly of claim 1, wherein a distance D between the first surface and the second surface and a distance D between a bottom surface of the groove and the first surface in the thickness direction satisfy: D/D is more than or equal to 0.1 and less than or equal to 0.6.

3. The end cap assembly of claim 1, wherein the end cap is provided with a protrusion protruding from the second surface and a recess recessed from the first surface in a direction adjacent to the second surface, the recess being disposed in correspondence with the protrusion;

along the thickness direction, the projections of the convex portion and the reinforcing portion on the end cap do not overlap.

4. The end cap assembly of claim 3, wherein the end cap assembly includes an electrode terminal disposed on the boss.

5. An end cap assembly according to claim 3 or 4, wherein the reinforcement is provided on both sides of the protrusion in a first direction, the first direction being perpendicular to the thickness direction.

6. The end cap assembly of claim 5, wherein the first direction is a length direction of the end cap.

7. An end cap assembly according to any one of claims 1-4, wherein the end cap assembly comprises:

and the pressure relief mechanism is arranged on the end cover, and projections of the pressure relief mechanism and the reinforcing part on the end cover are not overlapped along the thickness direction.

8. An end cap assembly according to any one of claims 1 to 4, wherein the reinforcement is a continuous structure disposed circumferentially of the groove.

9. An end cap assembly according to any one of claims 1 to 4, wherein the reinforcement is a discontinuous structure disposed circumferentially of the groove.

10. The end cap assembly of claim 9, wherein the reinforcement portion comprises a plurality of reinforcement segments spaced along the circumferential direction.

11. An end cap assembly according to any one of claims 1-4, wherein the end cap assembly comprises:

the reinforcing parts correspond to the grooves one to one.

12. The end cap assembly of any of claims 1-4, wherein the end cap assembly comprises:

a plurality of the reinforcement portions, each of the plurality of the reinforcement portions being disposed around the groove.

13. The end cap assembly of any of claims 1-4, wherein the end cap assembly comprises:

a plurality of said grooves, said reinforcement being disposed around a plurality of said grooves.

14. A battery cell, comprising:

an electrode assembly;

a case having an accommodation space with one end open for accommodating the electrode assembly;

the end cap assembly of any of claims 1-13, wherein the end cap is coupled to the housing and closes the opening.

15. The battery cell of claim 14, wherein the first surface faces the electrode assembly, the end cap assembly comprising:

an insulator disposed between the end cap and the electrode assembly, the reinforcement abutting against the insulator.

16. A battery, comprising:

a box body;

a battery cell according to claim 14 or 15, housed within the case.

17. The battery of claim 16, wherein the end cap is disposed on a side of the battery cell proximate to a bottom wall of the housing.

18. An electrical consumer, characterized in that it comprises a battery according to claim 16 or 17 for providing electrical energy.

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