End cap assembly, battery cell, battery and electrical equipment

Abstract

The present application provides an end cap assembly, a battery cell, a battery and an electrical device, and relates to the field of batteries. The end cap assembly includes an end cap, a groove and a reinforcement portion. The end cap has a first surface and a second surface arranged opposite to each other along its thickness direction. The groove is recessed from the first surface toward the second surface. The reinforcement portion is protruding from the first surface and / or the second surface and is arranged around the groove. By arranging the reinforcement portion on the end cap, the end cap assembly strengthens the strength and rigidity of the end cap, improves the impact resistance of the end cap, and reduces the deformation of the end cap when impacted, thereby alleviating the problem of deformation of the end cap and damage to the electrode assembly. In addition, the end cap assembly reduces the weight of the end cap by arranging the groove on the end cap, so that the weight of the front and rear end caps where the reinforcement portion is arranged is not much different or the same. By arranging the reinforcement portion around the groove, the rigidity and strength of the position where the groove is arranged can be reinforced, thereby improving its strength and rigidity without significantly increasing the weight of the end cap assembly.

Description

Technical Field

[0001] The present application relates to the field of batteries, and in particular to an end cover assembly, a battery cell, a battery, and an electrical device. Background Art

[0002] Batteries are widely used in new energy applications, such as electric vehicles and new energy vehicles. These have become a new trend in the automotive industry. A battery cell consists of an end cap, an electrode assembly, and a casing. The end cap and casing together form the internal environment of the battery cell, which houses the electrode assembly. However, in the case of an inverted battery cell, the electrode assembly often becomes damaged, leading to battery cell failure. Summary of the Invention

[0003] The purpose of the embodiments of the present application is to provide an end cap assembly, a battery cell, a battery and an electrical device, which are intended to alleviate the problem in the related art that the electrode assembly is often damaged when the battery cell is inverted.

[0004] In a first aspect, an embodiment of the present application provides an end cover assembly, comprising an end cover, a groove and a reinforcement portion, wherein the end cover has a first surface and a second surface arranged opposite to each other along its thickness direction, and the groove is recessed from the first surface toward the second surface; the reinforcement portion is protruded from the first surface and / or the second surface and is arranged around the groove.

[0005] In the above technical solution, the end cap assembly is enhanced by providing a reinforcement portion on the end cap, thereby increasing its strength and rigidity, improving its impact resistance and minimizing deformation of the end cap when subjected to an impact, thereby alleviating the problem of end cap deformation and damage to the electrode assembly. Furthermore, the end cap assembly is further reduced in weight by providing a groove on the end cap, ensuring that the weight of the end cap before and after the reinforcement portion is provided is similar or the same. By providing the reinforcement portion around the groove, the rigidity and strength of the groove are enhanced, thereby improving the strength and rigidity of the end cap assembly without significantly increasing its weight.

[0006] As an optional technical solution of an embodiment of the present application, along the thickness direction, the distance between the first surface and the second surface is D, and the distance between the bottom surface of the groove and the first surface is d, satisfying: 0.1≤d / D≤0.6.

[0007] In the above technical solution, along the thickness direction, the distance between the first surface and the second surface can also be understood as the thickness of the end cap. Along the thickness direction, the distance between the bottom surface of the groove and the first surface can also be understood as the depth of the groove. The depth of the groove is 0.1 to 0.6 times the thickness of the end cap. In this way, it has a good weight reduction effect without significantly weakening the strength of the end cap. If d / D < 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 greatly weakened, so that even if a reinforcement part is provided, the strength of the end cap is poor.

[0008] As an optional technical solution of an embodiment of the present application, the end cover 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 the direction close to the second surface, and the concave portion is provided corresponding to the convex portion; along the thickness direction, the projections of the convex portion and the reinforcing portion on the end cover do not overlap.

[0009] In the above technical solution, by forming a convex portion on the second surface and a concave portion at a position corresponding to the convex portion on the first surface, the concave portion can, on the one hand, accommodate components within the battery cell, thereby improving the energy density of the battery cell; on the other hand, the convex portion can enhance the bending strength and impact resistance of the end cap. The projections of the reinforcing portion and the convex portion on the end cap along the thickness direction do not overlap, that is, the reinforcing portion and the convex portion are spaced or staggered in a plane perpendicular to the thickness direction, thereby respectively strengthening the strength and rigidity of different positions of the end cap, improving the impact resistance of the end cap, and alleviating the problem of end cap deformation damaging the electrode assembly.

[0010] 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 arranged on the protrusion.

[0011] In the above technical solution, the electrode terminals can be electrically connected to the electrode assembly within the battery cell. Positioning the electrode terminals in the convex portion allows the electrode assembly to be partially accommodated in the concave portion, which helps improve the energy density of the battery cell. Furthermore, since the convex portion has strong impact resistance, positioning the electrode terminals there is less likely to be damaged by deformation of the end cap.

[0012] As an optional technical solution of the embodiment of the present application, the reinforcing portion is provided on both sides of the protrusion along a first direction, and the first direction is perpendicular to the thickness direction.

[0013] In the above technical solution, by arranging reinforcement parts on both sides of the convex part along the first direction, it is beneficial to enhance the strength and rigidity of the end cover, improve the impact resistance of the end cover, and make the deformation of the end cover smaller when it is impacted, so as to alleviate the problem of deformation of the end cover and damage to the electrode assembly.

[0014] As an optional technical solution of an embodiment of the present application, the first direction is the length direction of the end cover.

[0015] In the above technical solution, compared with the width direction of the end cover, the length direction of the end cover is more susceptible to deformation due to impact. By providing reinforcement parts on both sides of the length direction of the convex part, the impact resistance of the end cover in the length direction is enhanced to alleviate the problem of deformation of the end cover and damage to the electrode assembly.

[0016] As an optional technical solution of an embodiment of the present application, the end cover assembly includes a pressure relief mechanism, which is arranged on the end cover. Along the thickness direction, the projections of the pressure relief mechanism and the reinforcement portion on the end cover do not overlap.

[0017] In the above technical solution, the pressure relief mechanism can open to release the internal pressure of the battery cell when the internal pressure of the battery cell reaches the detonation pressure. By ensuring that the projections of the pressure relief mechanism and the reinforcement on the end cap along the thickness direction do not overlap, the pressure relief mechanism and the reinforcement do not interfere with each other, thus preventing the reinforcement from affecting the pressure relief function of the pressure relief mechanism.

[0018] As an optional technical solution of an embodiment of the present application, the reinforcement portion is a continuous structure arranged along the circumference of the groove.

[0019] In the above technical solution, the reinforcement portion is provided as a continuous structure arranged along the circumference of the groove, so that the integrity of the reinforcement portion is better and the reinforcement effect is better.

[0020] As an optional technical solution of an embodiment of the present application, the reinforcement portion is a discontinuous structure arranged along the circumference of the groove.

[0021] In the above technical solution, the reinforcement portion is provided as a discontinuous structure arranged along the circumference of the groove, so that the reinforcement portion can avoid other components and will not interfere with other components.

[0022] As an optional technical solution of an 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.

[0023] In the above technical solution, multiple reinforcement segments are provided to enhance the strength and rigidity of the end cap while also allowing for the placement of other battery cell components, preventing interference with these components. Furthermore, multiple reinforcement segments are lighter than a continuous structure, improving the strength and rigidity of the end cap assembly without significantly increasing its weight.

[0024] As an optional technical solution of an embodiment of the present application, the end cover assembly includes a plurality of the grooves, and the reinforcement portions correspond one-to-one to the grooves.

[0025] In the above technical solution, by providing a plurality of reinforcing parts and a plurality of grooves, the reinforcing effect on the strength and rigidity of the end cover is improved.

[0026] As an optional technical solution of the embodiment of the present application, the end cover assembly includes a plurality of the reinforcing parts, and the plurality of the reinforcing parts are all arranged around the groove.

[0027] In the above technical solution, by providing multiple reinforcement parts, and the multiple reinforcement parts are provided corresponding to one groove, the reinforcement effect on the strength and rigidity of the end cover can be improved, so that the end cover will be less deformed or not deformed when subjected to external impact.

[0028] As an optional technical solution of an embodiment of the present application, the end cover assembly includes a plurality of the grooves, and the reinforcement portion is arranged around the plurality of the grooves.

[0029] In the above technical solution, by providing multiple grooves, each of which corresponds to one reinforcement portion, the weight of the end cover can be reduced, so that the weight of the front and rear end covers with the reinforcement portion is not much different or is the same.

[0030] In a second aspect, an embodiment of the present application further provides a battery cell, which includes an electrode assembly, a shell and the above-mentioned end cover assembly; the shell has a accommodating space with an open end, and the accommodating space is used to accommodate the electrode assembly; the end cover is connected to the shell and closes the opening.

[0031] As an optional technical solution of an embodiment of the present application, the first surface faces the electrode assembly, the end cover assembly includes an insulating member, the insulating member is arranged between the end cover and the electrode assembly, and the reinforcing portion abuts against the insulating member.

[0032] In the above technical solution, an insulating member is provided between the end cap and the electrode assembly to insulate and isolate the end cap and the electrode assembly, preventing contact between the end cap and the electrode assembly and causing a short circuit. The reinforcing portion abuts the insulating member, which also acts as a buffer and reduces pressure when the end cap is impacted, minimizing deformation of the end cap and thus alleviating the problem of end cap deformation damaging the electrode assembly.

[0033] In a third aspect, an embodiment of the present application further provides a battery, which includes a box and the above-mentioned battery cells, and the battery cells are accommodated in the box.

[0034] As an optional technical solution of the embodiment of the present application, the end cover is arranged on a side of the battery cell close to the bottom wall of the box body.

[0035] In the above technical solution, the end cover is arranged on a side of the battery cell close to the bottom wall of the box body, that is, the battery cell is placed upside down in the box body.

[0036] In a fourth aspect, an embodiment of the present application further provides an electrical device, which includes the above-mentioned battery, and the battery is used to provide electrical energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0038] Figure 1 A schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0039] Figure 2 An exploded view of a battery provided in accordance with some embodiments of the present application;

[0040] Figure 3 A schematic diagram of the exploded structure of a battery cell provided in some embodiments of the present application;

[0041] Figure 4 A schematic structural diagram of an end cap assembly provided in some embodiments of the present application;

[0042] Figure 5 A bottom view of an end cap assembly provided in some embodiments of the present application;

[0043] Figure 6 A schematic top view of an end cap assembly provided in some embodiments of the present application;

[0044] Figure 7 for Figure 6 Cross-sectional view at the AA position;

[0045] Figure 8 for Figure 7 A magnified view of position B in the middle;

[0046] Figure 9 A schematic structural diagram of an end cap assembly provided in some other embodiments of the present application;

[0047] Figure 10 A bottom view schematically shows an end cap assembly provided in some other embodiments of the present application;

[0048] Figure 11 A schematic top view of an end cap assembly provided in some other embodiments of the present application;

[0049] Figure 12 for Figure 11 Cross-sectional view at the middle DD position;

[0050] Figure 13 A bottom view of an end cap assembly (the reinforcement portion includes a plurality of reinforcement segments) provided in some embodiments of the present application;

[0051] Figure 14 A bottom view of an end cap assembly (one groove corresponding to multiple reinforcement portions) provided in some embodiments of the present application;

[0052] Figure 15 A bottom view schematically shows an end cap assembly (multiple grooves corresponding to one reinforcement portion) provided in some embodiments of the present application.

[0053] Icons: 10-housing; 11-first part; 12-second part; 20-battery cell; 21-end cover assembly; 211-end cover; 2111-first surface; 2112-second surface; 2113-mounting hole; 2114-pressure relief hole; 212-groove; 213-reinforcement part; 2131-reinforcement section; 214-electrode terminal; 215-pressure relief mechanism; 216-convex part; 217-concave part; 22-electrode assembly; 23-housing; 100-battery; 200-controller; 300-motor; 1000-vehicle. DETAILED DESCRIPTION

[0054] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0055] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary-secondary relationship.

[0056] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments.

[0057] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0058] The term "and / or" in this application simply describes an association between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0059] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components in different embodiments are omitted. It should be understood that the thickness, length, width, and other dimensions of the various components in the embodiments of this application, as well as the overall thickness, length, width, and other dimensions of the integrated device shown in the drawings are merely illustrative and should not constitute any limitation on this application.

[0060] The term "plurality" used in this application refers to two or more (including two).

[0061] In this application, battery cells may include lithium-ion secondary battery cells, lithium-ion primary battery cells, lithium-sulfur battery cells, sodium-lithium-ion battery cells, sodium-ion battery cells, or magnesium-ion battery cells, etc., and the embodiments of this application do not limit this. Battery cells may be cylindrical, flat, rectangular, or other shapes, etc., and the embodiments of this application do not limit this. Battery cells are generally divided into three types based on the packaging method: cylindrical battery cells, prismatic battery cells, and soft-pack battery cells, and the embodiments of this application do not limit this.

[0062] The battery referred to in the embodiments of this 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 this application may include a battery module or a battery pack. A battery generally includes a casing that encloses one or more battery cells. The casing prevents liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0063] A battery cell includes an electrode assembly and an electrolyte. The electrode assembly consists of a positive electrode sheet, a negative electrode sheet, and a separator. A battery cell primarily operates by the movement of metal ions between the positive and negative electrode sheets. The positive electrode sheet comprises a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive electrode collector. The portion of the positive electrode collector not coated with the positive active material layer protrudes from the portion coated with the positive active material layer. The portion of the positive electrode collector not coated with the positive active material layer serves as the positive electrode tab. For lithium-ion batteries, for example, the positive electrode current collector can be made of aluminum, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide. The negative electrode sheet comprises a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative electrode collector. The portion of the negative electrode collector not coated with the negative active material layer protrudes from the portion coated with the negative active material layer. The portion of the negative electrode collector not coated with the negative active material layer serves as the negative electrode tab. The negative electrode current collector can be made of copper, and the negative active material can be carbon or silicon, among others. To ensure high current flow without melting, multiple positive tabs are stacked together, and multiple negative tabs are stacked together. The separator can be made of materials such as PP (polypropylene) or PE (polyethylene). Furthermore, the electrode assembly can be a wound or laminated structure, but the present invention is not limited thereto.

[0064] Currently, market developments indicate that batteries are increasingly being used. They are not only used in energy storage systems such as hydropower, thermal, wind, and solar power plants, but are also widely used in electric vehicles like electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. As battery applications continue to expand, market demand is also growing.

[0065] A battery cell consists of an end cap, an electrode assembly, and a casing. The end cap and casing together form the internal environment of the battery cell, which houses the electrode assembly. However, in an inverted battery cell, the electrode assembly often becomes damaged, leading to battery cell failure.

[0066] The inventors further discovered that when the battery cell is inverted, the end cap is more susceptible to external impact and deformation. The deformation of the end cap can easily cause the electrode assembly to deform under stress, thereby causing damage to the electrode assembly and leading to failure of the battery cell.

[0067] In view of this, an embodiment of the present application provides an end cap assembly, comprising an end cap, a groove, and a reinforcement portion. The end cap has a first surface and a second surface disposed opposite each other along its thickness, with the groove recessed from the first surface toward the second surface. The reinforcement portion is protruding from the first surface and / or the second surface and disposed around the groove.

[0068] By providing a reinforcement on the end cap, this end cap assembly enhances its strength and rigidity, improving its impact resistance and minimizing deformation of the end cap when impacted, thereby alleviating the problem of end cap deformation and damage to the electrode assembly. Furthermore, by providing a groove on the end cap, this end cap assembly reduces its weight, ensuring that the weight of the end cap before and after the reinforcement is provided is similar or the same. By surrounding the groove with the reinforcement, the rigidity and strength of the groove are enhanced, improving the strength and rigidity of the end cap assembly without significantly increasing its weight.

[0069] The technical solutions described in the embodiments of the present application are applicable to batteries and electrical devices using batteries.

[0070] Electrically powered devices may include vehicles, mobile phones, portable devices, laptop computers, ships, spacecraft, electric toys, and electric tools. Spacecraft include airplanes, rockets, space shuttles, and spacecraft. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys. Electric tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical devices.

[0071] For the convenience of description, the following embodiments are described by taking the electric device as a vehicle 1000 as an example.

[0072] Please refer to Figure 1 , Figure 1 A schematic structural diagram of a vehicle 1000 provided for some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000. The battery 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery 100 may be used to power the vehicle 1000. For example, the battery 100 may serve as an operating power source for the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to power the motor 300, for example, to meet the power requirements for starting, navigating and driving the vehicle 1000.

[0073] In some embodiments of the present application, the battery 100 can serve not only as an operating power source for the vehicle 1000, but also as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0074] Please refer to Figure 2 , Figure 2An exploded view of a battery 100 provided in some embodiments of the present application. The battery 100 includes a housing 10 and battery cells 20, with the battery cells 20 housed within the housing 10. The housing 10 is used to provide a storage space for the battery cells 20 and can have various structures. In some embodiments, the housing 10 can include a first portion 11 and a second portion 12, which overlap each other and together define a storage space for the battery cells 20. The second portion 12 can be a hollow structure with one end open. The first portion 11 can be a plate-like structure, with the first portion 11 overlapping the open side of the second portion 12, so that the first portion 11 and the second portion 12 together define a storage space. The first portion 11 and the second portion 12 can also be hollow structures with one end open, with the open side of the first portion 11 overlapping the open side of the second portion 12. Of course, the housing 10 formed by the first portion 11 and the second portion 12 can have various shapes, such as a cylinder, a rectangular parallelepiped, etc.

[0075] In the battery 100, there may be multiple battery cells 20, and the multiple battery cells 20 may be connected in series, in parallel, or in a hybrid connection. A hybrid connection refers to a combination of series and parallel connections among the multiple battery cells 20. The multiple battery cells 20 may be directly connected in series, in parallel, or in a hybrid connection, and then the entire battery cell 20 may be housed within the housing 10. Alternatively, the battery 100 may be constructed by first connecting multiple battery cells 20 in series, in parallel, or in a hybrid connection to form a battery module, which is then connected in series, in parallel, or in a hybrid connection to form a complete battery module, and then housed within the housing 10. The battery 100 may also include other structures, such as a busbar assembly for electrically connecting the multiple battery cells 20.

[0076] Each battery cell 20 may be a secondary battery cell or a primary battery cell; it may also be a lithium-sulfur battery cell, a sodium-ion battery cell, or a magnesium-ion battery cell, but is not limited thereto. The battery cell 20 may be cylindrical, flat, rectangular, or in other shapes.

[0077] Please refer to Figure 3 , Figure 3 The schematic diagram of the exploded structure of the battery cell 20 provided in some embodiments of the present application. The battery cell 20 refers to the smallest unit that constitutes the battery 100. Figure 3 The battery cell 20 includes an end cap assembly 21 , an electrode assembly 22 and a shell 23 .

[0078] The end cap assembly 21 includes an end cap 211, an electrode terminal 214 and a pressure relief mechanism 215. The end cap 211 refers to a component that covers the opening of the shell 23 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the end cap 211 can be adapted to the shape of the shell 23 to match the shell 23. Optionally, the end cap 211 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 211 is not easily deformed when squeezed or collided, so that the battery cell 20 can have a higher structural strength and improved safety performance. The material of the end cap 211 can also be a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not impose any special restrictions on this. The electrode terminal 214 is provided on the end cap 211. The electrode terminal 214 can be used to electrically connect to the electrode assembly 22 for outputting or inputting electrical energy of the battery cell 20. A pressure relief mechanism 215 is provided on the end cap 211. It is designed to open when the internal pressure or temperature of the battery cell 20 reaches the detonation pressure, thereby releasing the internal pressure of the battery cell 20. In some embodiments, the end cap assembly 21 also includes an insulating member disposed inside the end cap 211. The insulating member can be used to isolate the electrical connection components within the housing 23 from the end cap 211 to reduce the risk of short circuits. Exemplary materials include plastic, rubber, etc.

[0079] The housing 23 is a component that cooperates with the end cap 211 to form the internal environment of the battery cell 20. This internal environment can accommodate the electrode assembly 22, electrolyte, and other components. The housing 23 and the end cap 211 can be separate components. An opening can be provided in the housing 23, and the end cap 211 is placed over the opening to form the internal environment of the battery cell 20. Alternatively, the end cap 211 and the housing 23 can be integrated. Specifically, the end cap 211 and the housing 23 can form a common connection surface before other components are inserted into the housing. When the interior of the housing 23 is to be enclosed, the end cap 211 is placed over the housing 23. The housing 23 can have a variety of shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, or a hexagonal prism. Specifically, the shape of the housing 23 can be determined based on the specific shape and size of the electrode assembly 22. The housing 23 can be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this embodiment of the present application does not impose any particular limitations on this.

[0080] The electrode assembly 22 is a component in the battery cell 20 where electrochemical reactions occur. One or more electrode assemblies 22 may be contained in the housing 23. The electrode assembly 22 is mainly formed by winding or stacking positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets. The parts of the positive and negative electrode sheets with active materials constitute the main body of the electrode assembly 22, and the parts of the positive and negative electrode sheets without active materials each constitute a tab. The positive and negative electrode tabs may be located together at one end of the main body or respectively at both ends of the main body. During the charge and discharge process of the battery 100, the positive electrode active material and the negative electrode active material react with the electrolyte, and the tabs are connected to the electrode terminals 214 to form a current loop.

[0081] Please refer to Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 and Figure 8 , Figure 4 This is a schematic structural diagram of the end cover assembly 21 provided in some embodiments of the present application. Figure 5 A bottom view of the end cover assembly 21 provided in some embodiments of the present application.

[0082] Figure 6 Schematic top view of the end cover assembly 21 provided in some embodiments of the present application. Figure 7 for Figure 6 Cross-sectional view at position AA. Figure 8 for Figure 7 An enlarged view of position B in the figure. This embodiment of the present application provides an end cap assembly 21, comprising an end cap 211, a groove 212, and a reinforcement portion 213. The end cap 211 has a first surface 2111 and a second surface 2112 disposed opposite each other along its thickness. The groove 212 is recessed from the first surface 2111 toward the second surface 2112. The reinforcement portion 213 is protruded from the first surface 2111 and / or the second surface 2112 and is disposed around the groove 212.

[0083] The thickness direction is as follows Figure 8 The direction indicated by the double arrow C.

[0084] The first surface 2111 and the second surface 2112 are two surfaces disposed opposite each other in the thickness direction of the end cap 211. One of the first surface 2111 and the second surface 2112 is the inner surface of the end cap 211, and the other is the outer surface of the end cap 211. 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 the inner surface, the second surface 2112 is the outer surface. When the second surface 2112 is the outer surface, the first surface 2111 is the inner surface.

[0085] The groove 212 is a groove-shaped structure that passes through the first surface 2111 of the end cap 211 and extends from the first surface 2111 to the second surface 2112. The shape of the groove 212 is not limited. For example, the groove 212 can be rectangular or circular.

[0086] The reinforcement portion 213 is a raised structure protruding from the end cap 211. The reinforcement portion 213 can be protruding from either the first surface 2111 or the second surface 2112. When the reinforcement portion 213 is protruding from the first surface 2111, the reinforcement portion 213 and the groove 212 are located on the same side of the end cap 211. When the reinforcement portion 213 is protruding from the second surface 2112, the reinforcement portion 213 and the groove 212 are located on opposite sides of the end cap 211.

[0087] "The reinforcement portion 213 is disposed around the groove 212" includes both the reinforcement portion 213 partially surrounding the groove 212 and the reinforcement portion 213 completely surrounding the groove 212. The inner surface of the reinforcement portion 213 and the inner wall of the groove 212 can be coplanar, for example, flush with the inner wall of the groove 212. The inner surface of the reinforcement portion 213 and the inner wall of the groove 212 can also be non-coplanar, for example, there is a gap between the inner wall of the reinforcement portion 213 and the inner wall of the groove 212 along the length of the end cap 211.

[0088] The reinforcement portion 213 can have various shapes. For example, the reinforcement portion 213 is arranged in a racetrack shape or a rectangular shape, in which case the reinforcement portion 213 completely surrounds the groove 212. In another example, the reinforcement portion 213 is a U-shaped protrusion extending along a U-shaped track, in which case the reinforcement portion 213 half surrounds the groove 212.

[0089] The end cap assembly 21 is provided with a reinforcement portion 213 on the end cap 211 to strengthen the strength and rigidity of the end cap 211, thereby improving the impact resistance of the end cap 211 and reducing the deformation of the end cap 211 when impacted, thereby alleviating the problem of deformation of the end cap 211 damaging the electrode assembly 22. In addition, the end cap assembly 21 is provided with a groove 212 on the end cap 211 to reduce the weight of the end cap 211, so that the weight of the end cap 211 before and after the reinforcement portion 213 is provided is not much different or the same. By providing the reinforcement portion 213 around the groove 212, the rigidity and strength of the position where the groove 212 is provided can be reinforced, thereby improving its strength and rigidity without significantly increasing the weight of the end cap assembly 21.

[0090] In some embodiments, a mounting hole 2113 and a pressure relief hole 2114 are provided on the end cover 211 , wherein the mounting hole 2113 is used to mount the electrode terminal 214 , and the pressure relief hole 2114 is used to set the pressure relief mechanism 215 .

[0091] In some embodiments, along 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, satisfying: 0.1≤d / D≤0.6.

[0092] The distance between the first surface 2111 and the second surface 2112 along the thickness direction can also be understood as the thickness of the end cap 211. The distance between the bottom surface of the groove 212 and the first surface 2111 along the thickness direction can also be understood as the depth of the groove 212. "0.1 ≤ d / D ≤ 0.6" means that the depth of the groove 212 is 0.1 to 0.6 times the thickness of the end cap 211.

[0093] It should be noted that Figure 8 The dotted line shown in FIG is in the same plane as the first surface 2111, and the range of the groove 212 is Figure 8 The bottom wall, side walls and the portion enclosed by the dotted line of the middle groove 212. The dotted line is for the convenience of indicating the actual range of the groove 212 and for the convenience of marking the distance d between the bottom surface of the groove 212 and the first surface 2111. The dotted line does not represent the actual physical characteristics.

[0094] By setting the depth of groove 212 to 0.1 to 0.6 times the thickness of end cap 211, a good weight reduction effect is achieved without significantly weakening the strength of end cap 211. If d / D < 0.1, the depth of groove 212 is relatively shallow, resulting in a poor weight reduction effect. If d / D > 0.6, the depth of groove 212 is relatively large, significantly weakening the strength of end cap 211. Even with the reinforcement 213, the strength of end cap 211 is still poor.

[0095] Please refer to Figure 9 、 Figure 10 、 Figure 11 and Figure 12 , Figure 9 Schematic diagram of the structure of the end cover assembly 21 provided in some other embodiments of the present application. Figure 10 Schematic bottom view of the end cover assembly 21 provided in some other embodiments of the present application. Figure 11 Schematic top view of the end cover assembly 21 provided in some other embodiments of the present application. Figure 12 for Figure 11 Cross-sectional view taken at mid-DD. In other embodiments, the end cap 211 is provided with a protrusion 216 and a recess 217. The protrusion 216 is provided protrudingly from the second surface 2112, while the recess 217 is recessed from the first surface 2111 toward the second surface 2112. The recess 217 is provided correspondingly to the protrusion 216. Along the thickness direction, the projections of the protrusion 216 and the reinforcement portion 213 on the end cap 211 do not overlap.

[0096] The protrusion 216 is a protruding structure protruding from the second surface 2112. The recess 217 is a groove-shaped structure penetrating the first surface 2111 of the end cap 211 and extending in a direction from the first surface 2111 to the second surface 2112.

[0097] "The recessed portion 217 is provided correspondingly to the protruding portion 216" means that, along the thickness direction, the projection of the outline of the recessed portion 212 on the end cap 211 completely falls within the projection range of the protruding portion 216 on the end cap 211, or the projection of the protruding portion 216 on the end cap 211 completely falls within the projection range of the outline of the recessed portion 212 on the end cap 211. In some embodiments, the projection of the outline of the recessed portion 212 on the end cap 211 completely overlaps with the projection of the protruding portion 216 on the end cap 211.

[0098] In some embodiments, the concave portion 217 passes through the second surface 2112 and extends into the convex portion 216 .

[0099] “Along the thickness direction, the projections of the protrusion 216 and the reinforcement 213 on the end cover 211 do not overlap” means that the reinforcement 213 and the protrusion 216 are spaced apart or staggered in a plane perpendicular to the thickness direction.

[0100] By forming a protrusion 216 on the second surface 2112 and a recess 217 on the first surface 2111 at a position corresponding to the protrusion 216, the recess 217 can, on the one hand, accommodate components within the battery cell 20, thereby facilitating an increase in the energy density of the battery cell 20. Furthermore, the protrusion 216 can enhance the bending strength of the end cap 211 and improve the impact resistance of the end cap 211. Along the thickness direction, the projections of the protrusion 216 and the reinforcement 213 on the end cap 211 do not overlap, thereby respectively strengthening the strength and rigidity of different positions of the end cap 211, improving the impact resistance of the end cap 211, and alleviating the problem of deformation of the end cap 211 damaging the electrode assembly 22.

[0101] In some embodiments, the end cap assembly 21 includes an electrode terminal 214 disposed on the protrusion 216 .

[0102] The electrode terminal 214 is a component for electrically connecting to the electrode assembly 22 to output or input electrical energy from the battery cell 20. The protrusion 216 is provided with a mounting hole 2113, and the electrode terminal 214 is partially inserted into the mounting hole 2113.

[0103] The electrode terminal 214 can be electrically connected to the electrode assembly 22 within the battery cell 20. Positioning the electrode terminal 214 on the protrusion 216 facilitates partially accommodating the electrode assembly 22 within the recess 217, thereby improving the energy density of the battery cell 20. Furthermore, since the protrusion 216 is positioned for strong impact resistance, positioning the electrode terminal 214 there prevents damage to the electrode terminal 214 due to deformation of the end cap 211.

[0104] In some embodiments, reinforcement portions 213 are provided on both sides of the protrusion 216 along a first direction, where the first direction is perpendicular to the thickness direction.

[0105] The first direction is any direction perpendicular to the thickness direction. For example, the first direction may be the length direction of the end cap 211, or the first direction may be the width direction of the end cap 211. In this embodiment, the first direction is as follows: Figure 10 The E direction is indicated by the double arrow.

[0106] “Reinforcement portions 213 are provided on both sides of the protrusion 216 ” means that the end cover assembly 21 includes a plurality of reinforcement portions 213 , and the plurality of reinforcement portions 213 are respectively provided on both sides of the protrusion 216 in the first direction.

[0107] By providing reinforcement portions 213 on both sides of the protrusion 216 along the first direction, the strength and rigidity of the end cover 211 are enhanced, the impact resistance of the end cover 211 is improved, and the deformation of the end cover 211 when impacted is reduced, thereby alleviating the problem of deformation of the end cover 211 damaging the electrode assembly 22.

[0108] In some embodiments, the first direction is the length direction of the end cap 211 .

[0109] Compared with the width direction of the end cover 211, the length direction of the end cover 211 is more susceptible to deformation due to impact. By providing reinforcement portions 213 on both sides of the length direction of the protrusion 216, the impact resistance of the length direction of the end cover 211 is enhanced to alleviate the problem of deformation of the end cover 211 damaging the electrode assembly 22.

[0110] In some embodiments, the end cap assembly 21 includes a pressure relief mechanism 215, which is disposed on the end cap 211. Along the thickness direction, projections of the pressure relief mechanism 215 and the reinforcement portion 213 on the end cap 211 do not overlap.

[0111] The pressure relief mechanism 215 can be opened when the internal pressure of the battery cell 20 reaches the detonation pressure to relieve the internal pressure of the battery cell 20 .

[0112] “Along the thickness direction, the projections of the pressure relief mechanism 215 and the reinforcement portion 213 on the end cover 211 do not overlap” means that the pressure relief mechanism 215 and the reinforcement portion 213 are spaced apart or staggered in a plane perpendicular to the thickness direction.

[0113] By making the projections of the pressure relief mechanism 215 and the reinforcement portion 213 on the end cover 211 in the thickness direction non-overlapping, the pressure relief mechanism 215 and the reinforcement portion 213 do not interfere with each other, thereby preventing the reinforcement portion 213 from affecting the pressure relief function of the pressure relief mechanism 215 .

[0114] In some embodiments, the reinforcement portion 213 is a continuous structure disposed along the circumference of the groove 212 .

[0115] The phrase "reinforcement portion 213 is a continuous structure disposed along the circumference of groove 212" can also be understood as meaning that reinforcement portion 213 is a closed structure extending along a closed trajectory, circumferentially surrounding groove 212. A closed trajectory is a trajectory connected at both ends, such as a rectangular or elliptical trajectory. In some embodiments, reinforcement portion 213 is a track-shaped raised structure. In other embodiments, reinforcement portion 213 is a rectangular raised structure.

[0116] The reinforcement portion 213 is configured as a continuous structure arranged along the circumference of the groove 212 , so that the reinforcement portion 213 has better integrity and better reinforcement effect.

[0117] Please refer to Figure 13 , Figure 13 A bottom view of the end cap assembly 21 (the reinforcement portion 213 includes a plurality of reinforcement segments 2131 ) provided in some embodiments of the present application. In some embodiments, the reinforcement portion 213 is a discontinuous structure provided along the circumference of the groove 212 .

[0118] “The reinforcement portion 213 is a discontinuous structure provided along the circumference of the groove 212 ” can be understood as the reinforcement portion 213 including a plurality of parts, and the plurality of parts are provided around the groove 212 .

[0119] The reinforcement portion 213 is provided as a discontinuous structure arranged along the circumference of the groove 212 , so that the reinforcement portion 213 can avoid other components and will not interfere with other components.

[0120] Please refer to Figure 13 In some embodiments, the reinforcement portion 213 includes a plurality of reinforcement segments 2131 , and the plurality of reinforcement segments 2131 are arranged at intervals along the circumferential direction.

[0121] The reinforcement segment 2131 is a part of the reinforcement portion 213 . A plurality of reinforcement segments 2131 form the reinforcement portion 213 . The reinforcement segments 2131 are located around the groove 212 .

[0122] By providing multiple reinforcement segments 2131, the multiple reinforcement segments 2131 not only enhance the strength and rigidity of the end cap 211, but also allow for the avoidance of interference with other components of the battery cell 20. Furthermore, compared to a continuous structure, the multiple reinforcement segments 2131 are lighter, thus improving the strength and rigidity of the end cap assembly 21 without significantly increasing its weight.

[0123] In some embodiments, the end cap assembly 21 includes a plurality of grooves 212 , and the reinforcement portions 213 correspond one-to-one to the grooves 212 .

[0124] “One-to-one correspondence between the reinforcement portion 213 and the groove 212 ” means that there is a one-to-one relationship between the reinforcement portion 213 and the groove 212 . One reinforcement portion 213 is correspondingly disposed around one groove 212 .

[0125] By providing a plurality of reinforcing portions 213 and a plurality of grooves 212 , the effect of reinforcing the strength and rigidity of the end cover 211 is enhanced.

[0126] Please refer to Figure 14 , Figure 14 Schematic bottom view of the end cap assembly 21 (multiple reinforcements 213 corresponding to one groove 212 ) provided in some embodiments of the present application. In some embodiments, the end cap assembly 21 includes multiple reinforcements 213 , each of which is disposed around the groove 212 .

[0127] There is a many-to-one relationship between the reinforcement portion 213 and the groove 212, and multiple reinforcement portions 213 are arranged around the same groove 212. Figure 14 As shown in FIG, two reinforcement portions 213 are disposed together around one groove 212 .

[0128] By providing multiple reinforcement parts 213 , which are provided corresponding to one groove 212 , the strength and rigidity of the end cover 211 can be enhanced, so that the end cover 211 is less deformed or does not deform when subjected to external impact.

[0129] Please refer to Figure 15 , Figure 15 The bottom view of the end cap assembly 21 (a plurality of grooves 212 corresponding to a reinforcement portion 213) provided in some embodiments of the present application is shown. In some embodiments, the end cap assembly 21 includes a plurality of grooves 212, and the reinforcement portion 213 is disposed around the plurality of grooves 212.

[0130] There is a many-to-one relationship between the grooves 212 and the reinforcement parts 213, and one reinforcement part 213 is arranged around multiple grooves 212. Figure 15 As shown in FIG, a reinforcement portion 213 is disposed around the two grooves 212 .

[0131] By providing a plurality of grooves 212 , each of which corresponds to one reinforcement portion 213 , the weight of the end cover 211 can be reduced, so that the weight of the end cover 211 before and after the reinforcement portion 213 is provided is not much different or is the same.

[0132] The present embodiment further provides a battery cell 20, which includes an electrode assembly 22, a housing 23, and the aforementioned end cap assembly 21. The housing 23 has a receiving space with one end open for receiving the electrode assembly 22. The end cap 211 is connected to the housing 23 and closes the opening.

[0133] In some embodiments, the first surface 2111 faces the electrode assembly 22. The end cap assembly 21 includes an insulating member disposed between the end cap 211 and the electrode assembly 22. The reinforcing portion 213 abuts against the insulating member.

[0134] “The first surface 2111 faces the electrode assembly 22 ” means that the first surface 2111 is the inner surface of the end cover 211 .

[0135] The insulating member is made of a material with insulating properties, such as plastic or rubber, etc. The insulating member is used to insulate the end cap 211 and the electrode assembly 22 from each other to prevent the end cap 211 and the electrode assembly 22 from being electrically connected and causing a short circuit in the battery cell 20 .

[0136] An insulating member is provided between the end cap 211 and the electrode assembly 22 to insulate and isolate the end cap 211 and the electrode assembly 22, preventing contact and a short circuit between the end cap 211 and the electrode assembly 22. The reinforcing portion 213 abuts against the insulating member. When the end cap 211 is impacted, the insulating member also acts as a buffer and reduces pressure, minimizing deformation of the end cap 211 and thus alleviating the problem of deformation of the end cap 211 damaging the electrode assembly 22.

[0137] The embodiment of the present application further provides a battery 100 , which includes a housing 10 and the aforementioned battery cells 20 , wherein the battery cells 20 are accommodated in the housing 10 .

[0138] In some embodiments, the end cover 211 is disposed on a side of the battery cell 20 close to the bottom wall of the box body 10 .

[0139] The bottom wall of the box body 10 is a wall surface of the box body 10 opposite to the open end of the box body 10 .

[0140] By arranging the end cover 211 on the side of the battery cell 20 close to the bottom wall of the box body 10 , the battery cell 20 is placed upside down in the box body 10 .

[0141] An embodiment of the present application further provides an electrical device, which includes the above-mentioned battery 100, and the battery 100 is used to provide electrical energy.

[0142] According to some embodiments of this application, please refer to Figures 4 to 8 .

[0143] An embodiment of the present application provides an end cap assembly 21, which includes an end cap 211, a groove 212, and a reinforcement portion 213. The end cap 211 has a first surface 2111 and a second surface 2112 arranged opposite to each other along its thickness direction, and the groove 212 is recessed from the first surface 2111 toward the second surface 2112. The reinforcement portion 213 is protruded from the first surface 2111 and arranged around the groove 212. Along 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, satisfying the following: 0.1≤d / D≤0.6.

[0144] End cap 211 is provided with a convex portion 216 and a concave portion 217. The convex portion 216 is provided protrudingly from the second surface 2112, while the concave portion 217 is recessed from the first surface 2111 toward the second surface 2112. The concave portion 217 is provided corresponding to the convex portion 216. Along the thickness direction, the projections of the convex portion 216 and the reinforcement portion 213 on the end cap 211 do not overlap. Along the length of the end cap 211, reinforcement portions 213 are provided on both sides of the convex portion 216.

[0145] The end cap assembly 211 is provided with a reinforcement 213, which enhances the strength and rigidity of the end cap 211 and improves its impact resistance. This minimizes deformation of the end cap 211 when impacted, thereby alleviating the problem of deformation of the end cap 211 damaging the electrode assembly 22. Furthermore, the end cap assembly 211 is provided with a groove 212 to reduce its weight, ensuring that the weight of the end cap 211 before and after the reinforcement 213 is provided is similar or the same. By surrounding the reinforcement 213 with the groove 212, the rigidity and strength of the groove 212 are enhanced, improving the strength and rigidity of the end cap assembly 21 without significantly increasing its weight. The distance between the first surface 2111 and the second surface 2112 in the thickness direction can also be understood as the thickness of the end cap 211. The distance between the bottom surface of the groove 212 and the first surface 2111 in the thickness direction can also be understood as the depth of the groove 212. The depth of groove 212 is 0.1 to 0.6 times the thickness of end cap 211. This achieves a good weight reduction effect without significantly weakening the strength of end cap 211. If d / D < 0.1, the depth of groove 212 is shallow, resulting in a poor weight reduction effect. If d / D > 0.6, the depth of groove 212 is large, significantly weakening the strength of end cap 211. Even with the reinforcement 213, the strength of end cap 211 is still poor.

[0146] By forming a protrusion 216 on the second surface 2112 and a recess 217 on the first surface 2111 at a position corresponding to the protrusion 216, the recess 217 can, on the one hand, accommodate components within the battery cell 20, thereby improving the energy density of the battery cell 20. Furthermore, the protrusion 216 can increase the bending strength of the end cap 211 and enhance the impact resistance of the end cap 211. The projections of the reinforcement 213 and the protrusion 216 on the end cap 211 along the thickness direction do not overlap. In other words, the reinforcement 213 and the protrusion 216 are spaced or staggered on the surface of the end cap 211 to respectively enhance the strength and rigidity of different positions of the end cap 211, thereby improving the impact resistance of the end cap 211 and alleviating the problem of deformation of the end cap 211 damaging the electrode assembly 22. By providing reinforcement portions 213 on both sides of the protrusion 216 along the length direction of the end cover 211, the strength and rigidity of the end cover 211 are enhanced, the impact resistance of the end cover 211 is improved, and the deformation of the end cover 211 when impacted is reduced, thereby alleviating the problem of deformation of the end cover 211 damaging the electrode assembly 22.

[0147] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. An end cap assembly, characterized in that: include: The end cap has a first surface and a second surface disposed opposite to each other along a thickness direction thereof; a groove, recessed from the first surface toward the second surface; a reinforcement portion, protruding from the first surface and / or the second surface and arranged around the groove; A pressure relief mechanism is provided on the end cover, wherein along the length direction of the end cover, the pressure relief mechanism and the groove are spaced apart, and the pressure relief mechanism and the reinforcement portion are spaced apart; The electrode terminal is arranged on the end cover. Along the length direction of the end cover, the electrode terminal and the groove are spaced apart, and the electrode terminal and the reinforcement portion are spaced apart.

2. The end cap assembly according to claim 1, characterized in that: Along the thickness direction, the distance between the first surface and the second surface is D, and the distance between the bottom surface of the groove and the first surface is d, satisfying: 0.1≤d / D≤0.

6.

3. The end cap assembly according to claim 1, wherein: 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 concave from the first surface toward the second surface, and the concave portion is provided corresponding to the convex portion; Along the thickness direction, projections of the convex portion and the reinforcing portion on the end cover do not overlap.

4. The end cap assembly according to claim 3, characterized in that: The electrode terminal is provided on the protrusion.

5. The end cap assembly according to claim 3, characterized in that: The reinforcing parts are provided on both sides of the convex part along a first direction, and the first direction is perpendicular to the thickness direction.

6. The end cap assembly according to claim 5, characterized in that: The first direction is the length direction of the end cover.

7. The end cap assembly according to claim 1, wherein: The reinforcement portion is a continuous structure arranged along the circumference of the groove.

8. The end cap assembly according to claim 1, wherein: The reinforcement portion is a discontinuous structure arranged along the circumference of the groove.

9. The end cap assembly according to claim 8, characterized in that: The reinforcement portion includes a plurality of reinforcement segments, and the plurality of reinforcement segments are arranged at intervals along the circumferential direction.

10. The end cap assembly according to any one of claims 1 to 9, characterized in that: The end cap assembly comprises: There are a plurality of grooves, and the reinforcement parts correspond to the grooves one by one.

11. The end cap assembly according to any one of claims 1 to 9, characterized in that: The end cap assembly comprises: A plurality of reinforcing parts are provided, and the plurality of reinforcing parts are all arranged around the groove.

12. The end cap assembly according to any one of claims 1 to 9, characterized in that: The end cap assembly comprises: There are a plurality of grooves, and the reinforcement portion is arranged around the plurality of grooves.

13. A battery cell, characterized in that: include: electrode assembly; a housing having an accommodation space with an open end, wherein the accommodation space is used to accommodate the electrode assembly; According to any one of claims 1 to 12, the end cover is connected to the shell and closes the opening.

14. The battery cell according to claim 13, characterized in that: The first surface faces the electrode assembly, and the end cap assembly includes: An insulating member is disposed between the end cover and the electrode assembly, and the reinforcing portion abuts against the insulating member.

15. A battery, characterized in that: include: Box; The battery cell according to claim 13 or 14, wherein the battery cell is housed in the box.

16. The battery according to claim 15, characterized in that: The end cover is arranged on one side of the battery cell close to the bottom wall of the box body.

17. An electrical device, characterized in that: A battery according to claim 15 or 16 is included for providing electrical energy.

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