End cap, battery cell, battery and power-consuming device

Abstract

End cap for a battery cell, comprising: a cap body, wherein the cap body is configured to close an opening of a housing body of the battery cell, wherein the cap body has a first surface in a thickness direction of the cap body; a reinforcing section, wherein the reinforcing section projects from the first surface, wherein the reinforcing section is configured to reinforce the cap body.

Description

Technical field The present application relates to the technical field of batteries, in particular an end cap, a battery cell, a battery and a power-consuming device. State of the art Batteries are therefore frequently used in electronic devices. For example, mobile phones, laptops, battery-powered cars, electric vehicles, electric airplanes, electric boats, electric toy cars, electric toy boats, electric toy airplanes, and power tools, and so on. In battery technology, it is necessary to consider not only the safety of the battery cells but also their lifespan. Therefore, improving the lifespan of battery cells is a technical problem that urgently needs to be solved. Registration content The embodiments of the present application provide an end cap, a battery cell, a battery and a power-consuming device, which can effectively improve the service life of the battery cell. In a first aspect, the embodiments of the present application provide an end cap that can be used for a battery cell, comprising a cap body and a reinforcement section, wherein the cap body is configured to close an opening of a housing body of the battery cell, wherein the cap body has a first surface in a thickness direction of the cap body; wherein the reinforcement section projects from the first surface, and wherein the reinforcement section is configured to reinforce the cap body. In the above technical solution, a reinforcement section is provided on the first surface of the cap body in the thickness direction. This reinforcement section strengthens the cap body, improves the deformation resistance of the end cap, enhances the fatigue strength of the end cap, reduces the risk of end cap damage due to fatigue, and extends the end cap's service life, thereby increasing the lifespan of the battery cell. In some embodiments, the reinforcing section comprises a first arc section and a second arc section projecting from the first surface, with an opening of the first arc section facing away from an opening of the second arc section. Both the first and second arc sections are arc-shaped, and their openings face away from each other. This structure provides a larger effective area for the reinforcing section, thereby increasing the reinforcement area for the cap body. The arc-shaped first and second arc sections themselves exhibit higher resistance to deformation and are less prone to deformation under force applied in the thickness direction. This further strengthens the cap body and improves the deformation resistance and fatigue strength of the end cap. In some embodiments, the first arc section and the second arc section are connected to each other and form a connection area, the connection area having a first end and a second end opposite each other, the first arc section comprising a first arc segment and a second arc segment, the second arc section comprising a third arc segment and a fourth arc segment, the first arc segment and the third arc segment being connected to the first end, the second arc segment and the fourth arc segment being connected to the second end, the distance between the first arc segment and the third arc segment gradually increasing in a direction from the second end to the first end; the distance between the second arc segment and the fourth arc segment gradually increasing in a direction from the first end to the second end.The first and second arch segments are connected to form a joint area, which effectively reinforces the cap body. In the direction from the second end to the first end, the distance between the first and third arch segments gradually increases, thus gradually expanding the reinforcement area of ​​the first and third arch segments. Furthermore, the first and third arch segments themselves exhibit high resistance to deformation, which further enhances the reinforcing effect of the reinforcement section on the cap body. In the direction from the first end to the second end, the distance between the second and fourth arch segments gradually increases, thus gradually expanding the reinforcement area of ​​the second and fourth arch segments.Furthermore, the second arc segment and the fourth arc segment themselves exhibit high resistance to deformation, which further improves the reinforcing effect of the reinforcement section on the cap body. In some embodiments, the width of the connection area gradually increases in one direction from a central point of the connection area to the first and second ends. In this way, the reinforcing capacity of the connection area gradually increases from the central point to both ends, and the connection area itself exhibits good resistance to deformation, which enhances the reinforcing effect of the connection area on the cap body.Since the width of the connection area gradually increases from the center to the two ends, and the distance between the first arc segment and the third arc segment gradually increases in the direction from the second end to the first end, and the distance between the second arc segment and the fourth arc segment gradually increases in the direction from the first end to the second end, the width of the reinforcement section gradually increases from the center to the two ends, thus giving the reinforcement section a better reinforcing effect on the cap body. In some embodiments, the cap body is circular, with a centerline of the cap body passing through a central point. Changes in the internal pressure of the battery cell make a central area of ​​the cap body particularly susceptible to deformation. The central axis of the cap body passes through the center point of the connection area, allowing the reinforcement section to strengthen the central area of ​​the cap body and thus reducing the risk of end cap damage due to fatigue. In some embodiments, the first arc segment has a first side surface facing the third arc segment, wherein the third arc segment has a third side surface facing the first arc segment, the first side surface and the third side surface being connected by a first rounded corner surface; and / or the second arc segment has a second side surface facing the fourth arc segment, wherein the fourth arc segment has a fourth side surface facing the second arc segment, the second side surface and the fourth side surface being connected by a second rounded corner surface.The first and third side faces are connected by the first rounded corner face, thereby reducing the risk of stress concentration at a junction between the first and third arc segments; the second and fourth side faces are connected by the second rounded corner face, thereby reducing the risk of stress concentration at a junction between the second and fourth arc segments. In some embodiments, the first and third arc segments are arranged symmetrically; and / or the second and fourth arc segments are arranged symmetrically; and / or the first and second arc segments are arranged symmetrically; and / or the third and fourth arc segments are arranged symmetrically. The first and third arc segments are arranged symmetrically. When the cap body is subjected to a force, the force acting on the first and third arc segments is essentially the same. Therefore, the ability of the first and third arc segments to counteract the deformation of the cap body is also essentially the same. The first and third arc segments can effectively reinforce the cap body. The second and fourth arc segments are arranged symmetrically.When the cap body is subjected to a force, the force acting on the second and fourth arc segments is essentially the same. Therefore, the ability of the second and fourth arc segments to counteract the deformation of the cap body is also essentially the same. The second and fourth arc segments can effectively reinforce the cap body. The first and second arc segments are arranged symmetrically. When the cap body is subjected to a force, the force acting on the first and second arc segments is essentially the same. Therefore, the ability of the first and second arc segments to counteract the deformation of the cap body is also essentially the same. The first and second arc segments can effectively reinforce the cap body. The third and fourth arc segments are arranged symmetrically.When the cap body is subjected to a force, the force acting on the third and fourth arc segments is essentially the same. Therefore, the ability of the third and fourth arc segments to counteract the deformation of the cap body is also essentially the same. The third and fourth arc segments can effectively reinforce the cap body. In some embodiments, the central angle of the first arc segment is θ1, where θ1 > 90°; and / or the central angle of the second arc segment is θ2, where θ2 > 90°. θ1 > 90° increases the reinforcement area of ​​the first arc segment for the cap body; θ2 > 90° increases the reinforcement area of ​​the second arc segment for the cap body. In some embodiments, the reinforcement section is formed integrally with the cap body. This increases the bond strength between the reinforcement section and the cap body, thus improving the long-term stability of the end cap. In some embodiments, the cap body has a second surface in the thickness direction, opposite the first surface. The cap body is provided with a first recessed section, wherein the first recessed section is cut out of the second surface in a direction facing the first surface. At a location on the cap body corresponding to the first recessed section, a reinforcing section is formed, projecting from the first surface. During the forming process, a first recessed section can be formed in the second surface by stamping, thereby creating a reinforcing section that projects from the first surface. The forming of the reinforcing section is carried out in a simple manner.The first recess section creates a recess structure in the cap body at a point in the reinforcement section, giving the reinforcement section better resistance to deformation and improving the reinforcing effect of the reinforcement section for the cap body. In some embodiments, the reinforcing section projects in the thickness direction by a height H from the first surface, where the distance between the first and second surfaces is D, such that 0.04 mm² ≤ D*H ≤ 0.81 mm². If D*H < 0.04 mm², the thickness of at least D and H is too small, the end cap exhibits poor deformation resistance, and it is prone to deformation. If D*H > 0.81 mm², the thickness of at least D and H is too large, and the end cap occupies a large amount of space. Therefore, 0.04 mm² ≤ D*H ≤ 0.81 mm² can, on the one hand, improve the deformation resistance of the end cap and, on the other hand, prevent the end cap from occupying too much space. In some embodiments, the condition 0.06 mm² ≤ D*H ≤ 0.64 mm² is met. Therefore, it can further improve the deformation resistance of the end cap while simultaneously reducing the required space of the end cap. If D*H > 0.64 mm² and the reinforcement section is formed by stamping, the reinforcement section will be overstretched, leading to a weakening of its strength. Therefore, D*H ≤ 0.64 mm² can improve the strength of the reinforcement section. In some embodiments, 0.25 mm ≤ H ≤ 0.8 mm; and / or 0.25 mm ≤ D ≤ 0.8 mm. When H < 0.25 mm, the reinforcing section projects a smaller height from the first surface, and its reinforcing effect on the cap body is low. When H > 0.8 mm, the reinforcing section projects a greater height from the first surface, and it occupies a larger space. Therefore, when 0.25 mm ≤ H ≤ 0.8 mm, the reinforcing effect of the reinforcing section on the cap body can be improved, and the space occupied by the reinforcing section can be reduced. When D < 0.25 mm, the distance between the first and second surfaces is small, the deformation resistance of the cap body is poor, and the strength of the cap body is also poor. For D > 0.8 mm, the thickness of the cap body is relatively large, and the cap body takes up a lot of space.Therefore, at 0.25 mm ≤ H ≤ 0.8 mm, the deformation resistance and strength of the cap body can be improved, and the space occupied by the cap body can be reduced. In some embodiments, the reinforcement section has a side wall and a bottom wall, the side wall enclosing the bottom wall, and the side wall and bottom wall together forming a first recess section, wherein the maximum thickness of the side wall is L1 and the maximum thickness of the bottom wall is L2; ​​wherein, along the thickness direction, there is a distance D between the first surface and the second surface, where L1 ≤ D and L2 ≤ D. Since L1 and L2 are both not greater than D, the maximum thickness of the side wall and the maximum thickness of the bottom wall do not exceed the distance between the first and second surfaces. This simplifies the forming process, and the reinforcement section can be formed by stamping, thus simplifying the forming procedure. In some embodiments, the minimum thickness of the bottom wall is L3 and the minimum thickness of the side wall is L4, where D-L3 ≤ 0.2 mm; and / or where D-L4 ≤ 0.2 mm. If D-L3 > 0.2 mm, the minimum thickness of the bottom wall is small and the strength of the bottom wall is poor, making it susceptible to damage. Therefore, D-L3 ≤ 0.2 mm ensures that the bottom wall has sufficient strength. Similarly, if D-L4 > 0.2 mm, the minimum thickness of the side wall is small and the strength of the side wall is poor, making it susceptible to damage. Therefore, D-L4 ≤ 0.2 mm ensures that the side wall has sufficient strength. In some embodiments, the cap body has a pressure relief area, wherein at least a portion of the first surface is located in the pressure relief area, the cap body is provided with a notched groove, the notched groove being provided along an edge of the pressure relief area, the pressure relief area being configured such that, upon pressure relief of the battery cell, it opens with the notched groove acting as a boundary; a reinforcement section is provided in the pressure relief area. The pressure relief area enables the end cap to perform a pressure relief function. The pressure relief area can be opened with the notched groove acting as the boundary and has a large pressure relief area. The reinforcement section is located in the pressure relief area.The reinforcement section strengthens the pressure relief area and improves its resistance to deformation. Changes in the internal pressure of the battery cell make deformation of the pressure relief area less likely, thus reducing the risk of the pressure relief area opening during normal battery cell operation. In some embodiments, the notched groove is a groove that extends along a closed path. During pressure relief of the battery cell, the pressure relief area can be opened so that it separates from the outside of the battery cell. This increases the pressure relief area of ​​the battery cell, which improves the pressure relief efficiency. In some embodiments, the notched groove is ring-shaped. The structure of the ring-shaped notched groove is simple and easy to form. In some embodiments, the cap body is circular, with the notched groove and the cap body being coaxial. In this way, the pressure relief area defined by the notched groove is located in the central region of the cap body, which facilitates timely opening of the pressure relief area for pressure release. In some embodiments, the first surface faces the interior of the housing body, and the notched groove is provided on this first surface. Because the notched groove is located on the first surface, and because the first surface faces the interior of the housing body, the notched groove faces the interior of the battery cell and is not exposed to the exterior of the battery cell. This reduces the risk of oxidation of the area where the notched groove is located on the cap body due to contact with the exterior of the battery cell. Because the reinforcement section is located on the first surface, and because the first surface faces the interior of the housing body, the reinforcement section can utilize the interior of the battery cell and does not occupy any of the exterior space of the battery cell. In some embodiments, the reinforcing section comprises a first arc section and a second arc section projecting from the first surface, wherein an opening of the first arc section faces away from an opening of the second arc section, wherein there is a minimum distance between an end section of the first arc section in one direction of extension and the notched groove S1, where S1 > 0.5 mm; and / or wherein there is a minimum distance between an end section of the second arc section in one direction of extension and the notched groove S2, where S2 > 0.5 mm. S1 > 0.5 mm reduces the influence of the first arc section on the notched groove and decreases the risk of the notched groove being compressed due to the end section of the first arc section being too close to the notched groove.S2> 0.5 mm, thereby reducing the influence of the second arc section on the notched groove and reducing the risk of the notched groove being compressed because the end section of the second arc section is too close to the notched groove. In some embodiments, the cap body comprises a main body section and a connecting section, wherein the main body section has a first surface, and wherein the connecting section is provided around an outer edge of the main body section. In a thickness direction, the connecting section projects from the main body section in a direction facing the interior of the housing body, and the connecting section serves to extend into the housing body and establish a positioning fit with the housing body. The connecting section projects from the main body section in a direction facing the interior of the housing body and can form a positioning fit with the housing body, which improves the assembly efficiency of the end cap and the housing body. In some embodiments, the connecting section has a third surface facing the interior of the housing body in the thickness direction, with the first surface facing the interior of the housing body, and the reinforcing section not projecting beyond the third surface in the direction facing the interior of the housing body. This reduces the likelihood of the reinforcing section interfering with the internal components of the battery cell when the third surface of the connecting section is in contact with the internal components. In some embodiments, the main body section has a fourth surface and a fifth surface opposite each other in the thickness direction, with the connection area projecting from the fourth surface; wherein the main body section has a pressure relief area, wherein the main body section is provided with a notched groove and a second recess section, the notched groove being provided along an edge of the pressure relief area, the pressure relief area being configured such that, upon pressure relief of the battery cell, it opens with the notched groove acting as a boundary, wherein the second recess section is recessed from the fifth surface in a direction facing the fourth surface; wherein the projection of a bottom surface of the second recess section in the thickness direction covers the notched groove.The second recess section creates a certain distance between the pressure relief area and the fifth surface. When the fifth surface comes into contact with an external component, the influence of the external component on the pressure relief area is reduced, allowing the pressure relief area to open outwards when the battery cell is depressurized. This reduces the risk of the pressure relief area not opening properly due to obstruction by the external component. In some embodiments, the fifth surface along the thickness direction is a surface of the end cap furthest from the housing body. This fifth surface serves as a support surface for the battery cell. When the battery cell is placed on an external component, the fifth surface contacts the external component, thus ensuring the stability of the battery cell on the external component. In some embodiments, a projection section is formed at a location where the main body section corresponds to the second recess section, projecting from the fourth surface, with a surface of the projection section facing away from the fourth surface being a first surface. The projection section can increase the strength of the area of ​​the second recess section in the main body section. In some embodiments, the base surface of the second recess section faces the first surface in the thickness direction, the main body section being provided with a first recess section, the first recess section being cut out by a base surface of the second recess section in the direction facing the first surface, and a reinforcing section projecting from the first surface being formed at a location on the main body section corresponding to the first recess section. During the forming process, a first recess section can be formed in the base surface of the second recess section by stamping, thereby forming a reinforcing section projecting from the first surface. The reinforcing section is formed in a simple manner.The first recess section creates a recess structure in the main body section at a point in the reinforcement section, thereby giving the reinforcement section better deformation resistance and improving the reinforcement effect of the reinforcement section for the main body section. In some embodiments, the cap body further comprises an edge section, wherein the edge section encloses an outer edge of the connecting section, and wherein the edge section is connected at one end to an opening of the housing body. During assembly of the end cap and the housing body, after the connecting section has been positioned and fitted to the housing body, the edge section can rest at one end against an opening of the housing body, and it can be facilitated that the edge section is connected at one end to the opening of the housing body, for example by welding the edge section to the end with the opening of the housing body. In some embodiments, the end cap consists of at least one material: steel, stainless steel, or nickel-plated steel. This type of end cap is characterized by higher strength and rigidity, as well as a longer service life. According to a second aspect, embodiments of the present application provide a battery cell comprising a housing body and an end cap according to one of the embodiments of the first aspect above; wherein the housing body has an opening, and the cap body closes the opening. In some embodiments, the first surface faces the interior of the housing body along the thickness direction. According to a third aspect, embodiments of the present application provide a battery comprising a battery cell according to one of the embodiments of the second aspect above. According to a fourth aspect, embodiments of the present application provide a power-consuming device comprising a battery according to one of the embodiments of the third aspect above. Brief description of the drawings To more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the present application are briefly presented below. The drawings described below naturally represent only some embodiments of the present application. Skilled engineers can create further drawings based on these without additional design effort. Fig. 1 shows a schematic representation of the structure of a vehicle according to some embodiments of the present application; Fig. 2 shows an exploded view of a battery according to some embodiments of the present application; Fig. 3 shows an exploded view of a battery cell according to some embodiments of the present application; Fig. 4 shows a sectional view of the battery cell shown in Fig. 3; Fig. 5 shows an axonometric view of the battery cell shown in Fig. 6.Fig. 4 shows the end cap; Fig. 6 shows a top view of the end cap shown in Fig. 5; Fig. 7 shows a schematic representation of the structure of a reinforcement section in Fig. 6; Fig. 8 shows a sectional view of the end cap shown in Fig. 6 along AA; Fig. 9 shows a bottom view of the end cap shown in Fig. 8; Fig. 10 shows a partially enlarged view of B of the end cap in Fig. 8; Fig. 11 shows a partially enlarged view of C of the battery cell in Fig. 4. Description of the embodiments To clarify the objectives, technical solutions, and advantages of the embodiments presented in this application, the technical solutions of the embodiments are described in detail below with reference to the accompanying drawings. The described embodiments represent, of course, some, but not all, embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort fall within the scope of protection of this application. Unless otherwise defined, all technical and scientific terms used in this application have the same meanings commonly understood by a person skilled in the art in the field of this application; the terminology used in the description of this application serves solely to describe specific embodiments and is not intended to limit the application; the terms "comprising" and "with" and all variations thereof in the description, claims, and foregoing drawings of this application are intended to include non-exclusive inclusion. The terms "firstly," "secondly," etc., in the description, claims, or accompanying drawings of this application serve to distinguish between different objects and not to describe a particular sequence or a primary / secondary relationship. The reference to "embodiment" here means that a particular feature, structure, or property described in connection with the embodiments may be included in at least one embodiment of the present application. The presence of the term in different places in the description does not necessarily refer to the same embodiment, nor does it constitute a separate or alternative embodiment that mutually excludes other embodiments. The term "and / or" in this application merely describes an associative relationship between the associated objects and indicates that three types of relationships are possible, e.g., A and / or B, which can mean that A exists alone, that both A and B exist, and that B exists alone. Furthermore, the symbol " / " in this application generally indicates that the objects preceding and following it are in an "or" relationship. In the embodiments of this application, the same reference numerals denote the same parts, and for the sake of brevity, detailed descriptions of the same parts in the various embodiments are omitted. It is understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative examples and are not intended to limit this application. The term ‘plural’ used in the present application refers to two or more (including 2). In this application, the battery cell may, for example, comprise a lithium-ion secondary battery, a lithium-ion primary battery, a lithium-sulfur battery, a sodium-lithium-ion battery, a sodium-ion battery, or a magnesium-ion battery; the embodiments of this application are not limited thereto. The battery cell may be cylindrical, flat, rectangular, or of other geometries. Battery cells are generally classified into three types based on their shape: cylindrical, square, and pouch cells. However, the embodiments of this application are not limited thereto. The battery mentioned in the embodiments of the present application can be a single physical module comprising one or more battery cells to provide a higher voltage and capacity. For example, the battery mentioned in this application can comprise a battery module or a battery pack. A battery typically consists of a casing for holding one or more battery cells. The casing prevents liquids or other foreign matter from interfering with the charging or discharging process of the battery cells. A battery cell comprises an electrode assembly and an electrolyte. The electrode assembly consists of a positive electrode plate, a negative electrode plate, and a separator film. The battery cell functions primarily through the movement of metal ions between the positive and negative electrode plates. The positive electrode plate consists of a positive electrode current collector and a positive active material layer. The positive active material layer is applied to the surface of the positive electrode current collector. The positive electrode current collector without the positive active material layer protrudes from the positive electrode current collector with the positive active material layer. This positive electrode current collector without the positive active material layer serves as the positive terminal.Using lithium-ion batteries as an example, the material of the positive electrode current collector can be aluminum, and the positive electrode active material can be, for example, lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide. The negative electrode plate consists of a negative electrode current collector and a negative active material layer. The negative active material layer is applied to the surface of the negative electrode current collector. The negative electrode current collector without the negative active material layer protrudes from the negative electrode current collector with the negative active material layer. This negative electrode current collector without the negative active material layer serves as the negative terminal. The negative electrode current collector can be made of copper, and the negative electrode active material can be, for example, carbon or silicon.To ensure that a high current flow is possible without melting, several positive pole tabs are stacked on top of each other, and several negative pole tabs are stacked on top of each other. The separator material can be, for example, polypropylene (PP) or polyethylene (PE). Furthermore, the electrode arrangement of the present application can be a wound structure or a stacked structure, and the embodiments of the present application are not limited thereto. The inventor discovered that gas can be generated inside a battery cell during operation. This leads to changes in the internal pressure and, consequently, to deformation of the battery cell's end cap. Over time, the end cap becomes easily damaged due to fatigue, which reduces the battery cell's lifespan. In view of this, the embodiments of the present application provide an end cap wherein a first surface of the cap body is provided with a reinforcing section in the thickness direction, whereby the reinforcing section reinforces the cap body. In such an end cap, the reinforcement section strengthens the cap body, improves the deformation resistance of the cap body, improves the fatigue strength of the cap body, reduces the risk of damage to the cap body due to fatigue, and extends the service life of the cap body, thereby increasing the service life of the battery cell. The technical solutions described in the embodiments of the present application are all applicable to batteries and power-consuming devices that use batteries. The devices that consume electricity can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, power tools, and the like. Vehicles can be gasoline-powered cars, natural gas vehicles, or vehicles with alternative propulsion systems. Vehicles with alternative propulsion systems can be pure electric vehicles, hybrid vehicles, or vehicles with extended range, etc. Spacecraft include airplanes, rockets, space shuttles, and other spacecraft, etc. Electric toys include stationary or mobile electric toys such as game consoles, electric toy cars, electric toy ships, and electric toy airplanes, etc.Power tools include metalworking tools, grinding tools, assembly tools, and railway vehicle tools such as drills, angle grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. The present application does not impose any specific restrictions on the aforementioned power-consuming devices. For the sake of simplicity, the following examples are presented using the power-consuming device as an example of a vehicle. With reference to Fig. 1, Fig. 1 shows a schematic representation of the structure of a vehicle 1000 according to some embodiments of the present application. The vehicle 1000 is provided internally with a battery 100. The battery 100 can be located on the underside, at the front, or at the rear of the vehicle 1000. The battery 100 can be used to power the vehicle 1000. For example, the battery 100 can serve as the operating current source for the vehicle 1000. The vehicle 1000 can further comprise a control unit 200 and a motor 300, wherein the control unit 200 serves to control the battery 100 in order to supply the motor 300 with energy, e.g. for the operating energy requirements of the vehicle 1000 for starting, navigating and driving. In some embodiments of the present application, the battery 100 can be used not only as an operating energy source for the vehicle 1000, but also as a propulsion energy source for the vehicle 1000, instead of or partially instead of heating oil or natural gas to provide propulsion energy for the vehicle 1000. With reference to Fig. 2, Fig. 2 shows an exploded view of the structure of a battery 100 according to some embodiments of the present application, wherein the battery 100 comprises a battery cell 10 and a box 20, wherein the box 20 is used to accommodate the battery cell 10. The box 20 is a component that accommodates the battery cell 10, wherein the box 20 provides a receiving space for the battery cell 10, and the box 20 can assume various structures. In some embodiments, the box 20 can comprise a first section 201 and a second section 202, wherein the first section 201 and the second section 202 overlap each other to jointly define a receiving space for the battery cells 10. Among other things, the first section 201 and the second section 202 can have various shapes, such as rectangular, cylindrical, and the like. The first section 201 can be a hollow structure open on one side, and the second section 202 can also be a hollow structure open on one side, and when the open side of the second section 202 overlaps the open side of the first section 201, a box 20 with a receiving space is formed.The first section 201 can be a hollow structure open on one side, and the second section 202 can be a plate-like structure. When the second section 202 covers the open side of the first section 201, a box 20 with a receiving space is formed. The connection between the first section 201 and the second section 202 can be sealed by a sealing element, which may be a sealing ring, a sealant, or the like. The battery 100 can contain one or more battery cells 10. If there are multiple battery cells 10, they can be connected in series, parallel, or in a mixed circuit, where mixed circuit means that the multiple battery cells 10 are connected in both series and parallel. The multiple battery cells 10 can first be connected in series, parallel, or mixed to form a battery module, and then the multiple battery modules can be connected in series, parallel, or mixed to form a whole and be housed in the box 20. Alternatively, all battery cells 10 can be connected directly in series, parallel, or mixed, and then the entire assembly of all battery cells 10 is housed in the box 20. As shown in Fig. 3 and Fig. 4, Fig. 3 shows an exploded view of a battery cell 10 according to some embodiments of the present application; Fig. 4 shows a sectional view of the battery cell 10 shown in Fig. 3. The battery cell 10 can comprise a housing body 1, an electrode arrangement 2 and an end cap 3. The housing body 1 is a component for receiving the electrode assembly 2. The housing body 1 can be a hollow structure with an opening at one end. The housing body 1 can have various shapes, such as cylindrical, rectangular, and the like. The material of the housing body 1 can be diverse, for example, copper, iron, aluminum, steel, and aluminum alloy. The electrode assembly 2 is the component of the battery cell 10 in which the electrochemical reaction takes place. The electrode assembly 2 can comprise a cathode foil, an anode foil, and a separator. The electrode assembly 2 can be a wound structure formed by winding a cathode foil, a separator, and an anode foil, or a stacked structure formed by stacking a cathode foil, a separator, and an anode foil. The electrode assembly 2 has a first electrode tab 21 and a second electrode tab 22, wherein one of the first electrode tab 21 and the second electrode tab 22 is a cathode tab and the other is an anode tab. The cathode tab can be a portion of the cathode foil that is not coated with the active cathode material layer, and the anode tab can be a portion of the anode foil that is not coated with the active anode material layer. The end cap 3 is a component that closes the opening of the housing body 1 to isolate the internal environment of the battery cell 10 from the external environment. The end cap 3 and the housing body 1 together form a sealed space to accommodate the electrode assembly 2, the electrolyte solution, and other components. The shape of the end cap 3 can be adapted to the shape of the housing body 1; for example, the housing body 1 may be rectangular and the end cap 3 may also be rectangular and adapted to the housing body 1, or, as shown in Figures 3 and 4, the housing body 1 may be cylindrical and the end cap 3 may be circular and adapted to the housing body 1. The material of the end cap 3 can be various, such as copper, iron, aluminum, steel, or aluminum alloy. The material of the end cap 3 and the material of the housing body 1 can be the same or different. The battery cell 10 can further comprise an electrode clamp 4, the electrode clamp being electrically connected to the electrode arrangement 2 to output the electrical energy of the battery cell 10. The electrode clamp 4 can be installed on the housing body 1 or on the end cap 3. In the embodiments shown in Figures 3 and 4, the electrode clamp 4 is provided on a wall section 11 of the housing body 1, which is opposite the end cap 3. The end cap 3 is electrically connected to the first electrode tab 21, and the electrode clamp 4 is electrically connected to the second electrode tab 22. Naturally, the end cap 3 can be connected directly or indirectly to the first electrode tab 21, or the electrode clamp 4 can be connected directly or indirectly to the second electrode tab 22. For example, the end cap 3 is indirectly connected to the first electrode tab 21 via a collector component 5, and the electrode clamp 4 is indirectly connected to the second electrode tab 22 via another collector component 5. The collector component 5 is a metal conductor, for example, copper, iron, aluminum, steel, or an aluminum alloy, and the collector component 5 is disc-shaped. As shown in Figs. 5 and 6, Fig. 5 shows an axonometric view of the end cap 3 shown in Fig. 4; Fig. 6 shows a top view of the end cap 3 shown in Fig. 5. The embodiments of the present application provide an end cap 3 that can be used for the battery cell 10, comprising a cap body 31 and a reinforcing section 32. The cap body 31 can be used to close an opening of a housing body 1 of the battery cell 10, wherein the cap body 31 has a first surface 311 in a thickness direction of the cap body 31. The reinforcing section 32 projects from the first surface 311, and the reinforcing section 32 can be used to reinforce the cap body 31. The cap body 31 is a main part of the end cap 3 and can close the opening of the housing body 1. The shape of the housing body 31 can vary, e.g., circular, rectangular, etc. The first surface 311 can be the surface of the cap body 31 facing the housing body 1 in the thickness direction Z, or it can be the surface of the cap body 31 facing away from the housing body 1 in the thickness direction Z. The first surface 311 can be the surface of the cap body 31 that is closest to the housing body 1 in the thickness direction Z, or the surface of the cap body 31 that is furthest away from the housing body 1 in the thickness direction Z, or the surface of the cap body 31 that lies between the surface of the cap body 31 that is closest to the housing body 1 and the surface that is furthest away from the housing body 1 in the thickness direction Z.If, for example, the cap body 31 is a flat plate structure, the cap body 31 has an inner surface and an outer surface that are opposite each other in the thickness direction Z, the inner surface faces the housing body 1 in the thickness direction Z, the first surface 311 can be the inner surface or the outer surface of the cap body 31. The reinforcing section 32 is the part of the end cap 3 that projects from the first surface 311 and reinforces the cap body 31. The reinforcing section 32 can improve the stiffness of the cap body 31 and increase its resistance to deformation, thereby improving the overall resistance to deformation of the end cap 3. The reinforcing section 32 can have various shapes, such as straight, arcuate, annular, U-shaped, circular, rectangular, etc. The reinforcing section 32 and the cap body 31 can be formed as a single piece. For example, the reinforcing section 32 can be formed on the end cap 3 by stamping, so that the reinforcing section 32 and the cap body 31 are formed as a single piece. Alternatively, the reinforcing section 32 and the cap body 31 can be manufactured separately and joined together, for example, by welding. In the embodiments of the present application, a reinforcing section 32 is provided on the first surface 311 of the cap body 31 in the thickness direction Z. The reinforcing section 32 strengthens the cap body 31, improves the deformation resistance of the end cap 3, improves the fatigue strength of the end cap 3, reduces the risk of damage to the end cap 3 due to fatigue, and extends the service life of the end cap 3, thereby increasing the service life of the battery cell 10. The inventor discovered that in a general battery 100, the battery cell 10 can be attached to an external component by means of an adhesive layer. The adhesive layer connects the external component to the end cap 3. External components can include the bottom wall 327 of the housing body 20, the thermal management component, etc. The thermal management component is a component that regulates the temperature of the battery cells 10 inside the housing body 20. For example, the thermal management component could be a water cooling plate. If gas is generated in the battery cell 10, this can lead to expansion of the battery cell 10 and thus to deformation of the end cap 3. If the end cap 3 is deformed, this can cause it to detach from the adhesive layer.However, in the embodiments of the present application, the reinforcement section 32 improves the deformation resistance of the end cap 3 and reduces the risk of the end cap 3 detaching from the adhesive layer. In some embodiments, as shown in Fig. 5 and Fig. 6, the reinforcement section 32 comprises a first arc section 321 and a second arc section 322 projecting from the first surface 311, with an opening of the first arc section 321 facing away from an opening of the second arc section 322. Both the first arc section 321 and the second arc section 322 are arc-shaped and both protrude from the first surface 311. The central angle of the first arc segment 321 can be any angle less than 360°, such as an acute angle, a right angle, an obtuse angle, etc. The central angle of the second arc segment 322 can be any angle less than 360°, such as an acute angle, a right angle, an obtuse angle, etc. The first arc segment 321 has two ends in the direction of extension, and the connecting line (straight line) that joins the two ends of the first arc segment 321 forms the opening of the first arc segment 321. The second arc segment 322 has two ends in the direction of extension, and the connecting line (straight line) that joins the two ends of the second arc segment 322 forms the opening of the second arc segment 322.The first arc section 321 has a first arc surface 3210 facing away from the second arc section 322, and the first arc surface 3210 extends to both ends of the first arc section 321; the second arc section 322 has a second arc surface 3220 facing away from the first arc section 321, and the second arc surface 3220 extends to both ends of the second arc section 322. The opening of the first arc section 321 faces away from the opening of the second arc section 322, that is, the first arc surface 3210 and the second arc surface 3220 face away from each other. The first arc section 321 and the second arc section 322 can be directly connected to each other; however, the first arc section 321 and the second arc section 322 can also be spaced apart from each other, for example, the first arc section 321 and the second arc section 322 are spaced apart along a radial direction of the cap body 31. In this embodiment, both the first arc section 321 and the second arc section 322 are arc-shaped, and their openings face away from each other. This structure provides a larger effective area for the reinforcing section 32, thereby increasing the reinforcement area for the cap body 31. The arc-shaped first arc section 321 and the second arc section 322 themselves exhibit higher deformation resistance and do not deform as easily under a force in the thickness direction Z. This further strengthens the cap body 31 and improves the deformation resistance and fatigue strength of the end cap 3. In some embodiments, as shown in Fig. 6 and Fig. 7, Fig. 7 shows a schematic representation of the structure of a reinforcement section in Fig. 6. The first arc section 321 and the second arc section 322 are connected to each other and form a connection area 323, wherein the connection area 323 has a first end 3231 and a second end 3232 opposite each other, wherein the first arc section 321 comprises a first arc segment 3211 and a second arc segment 3212, wherein the second arc section 322 comprises a third arc segment 3221 and a fourth arc segment 3222, wherein the first arc segment 3211 and the third arc segment 3221 are connected to the first end 3231, and wherein the second arc segment 3212 and the fourth arc segment 3222 are connected to the second end 3232.The distance between the first arc segment 3211 and the third arc segment 3221 gradually increases in a direction from the second end 3232 to the first end 3231. The distance between the second arc segment 3212 and the fourth arc segment 3222 gradually increases in a direction from the first end 3231 to the second end 3232. The connecting area 323 is a common part of the first arc section 321 and the second arc section 322. In an embodiment where the cap body 31 is circular, the first end 3231 and the second end 3232 can be the two ends of the connecting area 323 that are opposite each other along the radial direction of the cap body 31. The first arc segment 3211 and the second arc segment 3212 are the arc segments of the first arc section 321 that are located at the first end 3231 and the second end 3232 of the connecting area 323, respectively. The arc length of the first arc segment 3211 and the arc length of the second arc segment 3212 can be the same or different. Part of the first arc surface 3210 of the first arc section 321 is located in the first arc section 321, another part is located in the second arc section 322 and the remainder is located in the connecting area 323.The third arc segment 3221 and the fourth arc segment 3222 are the arc sections of the second arc section 322 located at the first end 3231 and the second end 3232, respectively, of the connecting region 323. The arc lengths of the third arc segment 3221 and the arc lengths of the fourth arc segment 3222 can be equal or unequal. Part of the second arc area 3220 of the second arc section 322 is located in the first arc section, another part is located in the fourth arc section, and the remainder is located in the connecting region 323. For example, in the embodiment shown in Fig. 7, the arc length of the first arc segment 3211 is equal to the arc length of the second arc segment 322, and the arc length of the third arc segment 3221 is equal to the arc length of the fourth arc segment 3222. The first arc segment 3211 has a first side surface 3211a facing the third arc segment 3221, and the third arc segment 3221 has a third side surface 3221a facing the first arc segment 3211. The distance between the first arc segment 3211 and the third arc segment 3221 is the distance between the first side surface 3211a and the third side surface 3221a in a first direction X. The second arc segment 3212 has a second side surface 3212a facing the fourth arc segment 3222, and the fourth arc segment 3222 has a fourth side surface 3222a facing the second arc segment 3212. The distance between the second arc segment 3212 and the fourth arc segment 3222 refers to the distance between the second side surface 3212a and the fourth side surface 3222a in the first direction X.The first direction X is perpendicular to the direction from the first end 3231 to the second end 3232. In this embodiment, the first arc section 321 and the second arc section 322 are connected to each other, forming a connection area 323, which effectively reinforces the cap body 31. In the direction from the second end 3232 to the first end 3231, the distance between the first arc segment 3211 and the third arc segment 3221 gradually increases, thereby gradually expanding the reinforcement area of ​​the first arc segment 3211 and the third arc segment 3221. Furthermore, the first arc segment 3211 and the third arc segment 3221 themselves exhibit high resistance to deformation, which further enhances the reinforcing effect of the reinforcement section 32 on the cap body 31.In the direction from the first end 3231 to the second end 3232, the distance between the second arc segment 3212 and the fourth arc segment 3222 gradually increases, thereby gradually expanding the reinforcement area of ​​the second arc segment 3212 and the fourth arc segment 3222. Furthermore, the second arc segment 3212 and the fourth arc segment 3222 themselves exhibit high resistance to deformation, which further enhances the reinforcing effect of the reinforcement section 32 on the cap body 31. In some embodiments, as shown in Fig. 7, the width of the connection area 323 gradually increases in one direction from a central point 0 of the connection area 323 to the first end 3231 and to the second end 3232. The midpoint O of the connecting area 323 is the midpoint of the connecting line (straight line) that connects the first end 3231 and the second end 3232 of the connecting area 323. The midpoint O of the connecting area 323 can be defined as a geometric center of the connecting area 323. The width of the connecting area 323 is the dimension of the connecting area 323 in the first direction X. The width of the connecting area 323 is smallest at the midpoint O. For example, the width of the connecting area 323 at the midpoint O is less than twice the width of any of the first arc segment 3211, the second arc segment 3212, the third arc segment 3221, and the fourth arc segment 3222. In this embodiment, the reinforcing capacity of the connection area 323 gradually increases from the center point O to both ends, and the connection area 323 itself exhibits good resistance to deformation, which enhances the reinforcing effect of the connection area 323 on the cap body 31. Since the width of the connection area 323 gradually increases from the center point O to both ends, and since the distance between the first arc segment 3211 and the third arc segment 3221 gradually increases in the direction from the second end 3232 to the first end 3231, and since the distance between the second arc segment 3212 and the fourth arc segment 3222 gradually increases in the direction from the first end 3231 to the second end 3232, the width of the reinforcing section 32 gradually increases from the center to both ends, thereby providing the reinforcing section 32 with a better reinforcing effect on the cap body 31. In some embodiments, the cap body 31 is circular, with a center line of the cap body 31 passing through the center point O of the connection area 323. Understandably, the center line of the cap body 31 passes through the midpoint of the connecting line that links the first end 3231 and the second end 3232. The center line of the cap body 31 can be the perpendicular bisector of the connecting line (straight line) between the first end 3231 and the second end 3232. Changes in the internal pressure of the battery cell 10 make a central area of ​​the cap body 31 particularly susceptible to deformation. The central axis of the cap body 31 passes through the center point O of the connection area 323, allowing the reinforcement section 32 to strengthen the central area of ​​the cap body 31 and thus reducing the risk of damage to the end cap 3 due to fatigue. In some embodiments, as shown in Fig. 7, the first arc segment 3211 has a first side surface 3211a facing the third arc segment 3221, wherein the third arc segment 3221 has a third side surface 3221a facing the first arc segment 3211, the first side surface 3211a and the third side surface 3221a being connected by a first rounded corner surface 324; and / or the second arc segment 3212 has a second side surface 3212a facing the fourth arc segment 3222, wherein the fourth arc segment 3222 has a fourth side surface 3222a facing the second arc segment 3212, the second side surface 3212a and the fourth side surface 3222a being connected by a second rounded corner surface 325. The first side surface 3211a, the second side surface 3212a, the third side surface 3221a, and the fourth side surface 3222a are arc surfaces. The first side surface 3211a and the second side surface 3212a can be concentric with the first arc surface 3210, and the third side surface 3221a and the fourth side surface 3222a can be concentric with the second arc surface 3220. The first rounded corner surface 324 is an arc surface connecting the first side surface 3211a and the third side surface 3221a. Both the first side surface 3211a and the third side surface 3221a can be tangent to the first rounded corner surface 324. The second rounded corner surface 325 is an arc surface connecting the second side surface 3212a and the fourth side surface 3222a. Both the second side surface 3212a and the fourth side surface 3222a can be tangent to the second rounded corner surface 325. The first side surface 3211a and the third side surface 3221a are connected by the first rounded corner surface 324, thereby reducing the risk of stress concentration at a connection point between the first arc segment 3211 and the third arc segment 3221; the second side surface 3212a and the fourth side surface 3222a are connected by the second rounded corner surface 325, thereby reducing the risk of stress concentration at a connection point between the second arc segment 3212 and the fourth arc segment 3222. In some embodiments, as shown in Fig. 7, the first arc segment 3211 and the third arc segment 3221 are provided symmetrically; and / or the second arc segment 3212 and the fourth arc segment 3222 are provided symmetrically; and / or the first arc segment 3211 and the second arc segment 3212 are provided symmetrically; and / or the third arc segment 3221 and the fourth arc segment 3222 are provided symmetrically. As shown in Fig. 7, the first arc segment 3211 and the third arc segment 3221 can be arranged symmetrically around the first reference surface F, the second arc segment 3212 and the fourth arc segment 3222 can also be arranged symmetrically around the first reference surface F, and the connecting area 323 can form a symmetrical structure around the first reference surface F. The first arc segment 3211 and the second arc segment 3212 can be arranged symmetrically around the second reference surface G, the third arc segment 3221 and the fourth arc segment 3222 can also be arranged symmetrically around the second reference surface G, and the connecting area 323 can form a symmetrical structure around the second reference surface G. The second reference surface G can be perpendicular to the first reference surface F. The first arc segment 3211 and the third arc segment 3221 are arranged symmetrically. When the cap body 31 is subjected to a force, the force acting on the first arc segment 3211 and the third arc segment 3221 is essentially the same. Therefore, the ability of the first arc segment 3211 and the third arc segment 3221 to counteract the deformation of the cap body 31 is also essentially the same. The first arc segment 3211 and the third arc segment 3221 can effectively reinforce the cap body 31. The second arc segment 3212 and the fourth arc segment 3222 are arranged symmetrically. When the cap body 31 is subjected to a force, the force acting on the second arc segment 3212 and the fourth arc segment 3222 is essentially the same. Therefore, the ability of the second arc segment 3212 and the fourth arc segment 3222 to counteract the deformation of the cap body 31 is essentially the same.The second arc segment 3212 and the fourth arc segment 3222 can effectively reinforce the cap body 31. The first arc segment 3211 and the second arc segment 3212 are arranged symmetrically. When the cap body 31 is subjected to a force, the force acting on the first arc segment 3211 and the second arc segment 3212 is essentially the same. Therefore, the ability of the first arc segment 3211 and the second arc segment 3212 to counteract the deformation of the cap body 31 is also essentially the same. The third arc segment 3221 and the fourth arc segment 3222 are arranged symmetrically. When the cap body 31 is subjected to a force, the force acting on the third arc segment 3221 and the fourth arc segment 3222 is essentially the same.Therefore, the ability of the third arc segment 3221 and the fourth arc segment 3222 to counteract the deformation of the cap body 31 is essentially the same. The third arc segment 3221 and the fourth arc segment 3222 can effectively reinforce the cap body 31. In some embodiments, as shown in Fig. 7, a central angle of the first arc section 321 is θ1, where θ1> 90° is satisfied; and / or a central angle of the second arc section 322 is θ2, where θ2> 90° is satisfied. In Fig. 7, in the direction of extension of the first arc segment 321, one end of the first arc segment 321 is connected to the center of the circle on which the first arc surface 3210 is located, thus forming a first connecting line I. The other end of the first arc segment 321 is also connected to the center of the circle on which the first arc surface 3210 is located, thus forming a second connecting line K. The angle between the first connecting line I and the second connecting line K is the central angle θ1 of the first arc segment 321. In the direction of extension of the second arc segment 322, one end of the second arc segment 322 is connected to the center of the circle on which the second arc surface 3220 is located, thus forming a third connecting line M.The other end of the second arc segment 322 is also connected to the center of the circle on which the second arc surface 3220 is located, thus forming a fourth connecting line N. The angle between the third connecting line M and the fourth connecting line N is the central angle θ1 of the second arc segment 322. θ1 can be several angles greater than 90°, such as 100°, 135°, 180°, 225°, 270°, etc. θ2 can also be several angles greater than 90°, such as 100°, 135°, 180°, 225°, 270°, etc. θ1 and θ2 can be equal or unequal. In the embodiment shown in Fig. 7, θ1 = θ2. In this embodiment, θ1> 90° increases the reinforcement area of ​​the first arc section 321 for the cap body 31; θ2> 90° increases the reinforcement area of ​​the second arc section 322 for the cap body 31. In some embodiments, the reinforcement section 32 is formed as one piece with the cap body 31. The reinforcement section 32 and the cap body 31 can be formed in one piece by various forming processes, such as casting, stamping, etc. In this embodiment, the reinforcement section 32 and the cap body 31 are formed as a single piece. This increases the bond strength between the reinforcement section 32 and the cap body 31, which improves the long-term stability of the end cap 3. In some embodiments, as shown in Fig. 8 and Fig. 9, Fig. 8 shows a sectional view of the end cap 3 shown in Fig. 6 along AA; Fig. 9 shows a bottom view of the end cap 3 shown in Fig. 8. The cap body 31 has a second surface 312 in the thickness direction Z, which is opposite the first surface 311, wherein the cap body 31 is provided with a first recess section 313, wherein the first recess section 313 is recessed from the second surface 312 in a direction facing the first surface 311, and wherein a reinforcing section 32 is formed at a location of the cap body 31 corresponding to the first recess section 313, which projects from the first surface 311. The second surface 312 is the surface of the cap body 31 opposite the first surface 311, and the distance between the second surface 312 and the first surface 311 can be described as the thickness of the cap body 31. The shape of the second recess section 3163 corresponds to the shape of the reinforcement section 32. During the forming process, a first recess section 313 can be formed in the second surface 312 by stamping, thereby creating a reinforcing section 32 that protrudes from the first surface 311. The forming of the reinforcing section 32 is carried out in a simple manner. The first recess section 313 forms a recess structure in the cap body 31 at a point on the reinforcing section 32, thereby giving the reinforcing section 32 better resistance to deformation and improving its reinforcing effect on the cap body 31. In some embodiments, as shown in Fig. 8, the reinforcing section 32 projects in the thickness direction Z by a height H from the first surface 311, wherein a distance between the first surface 311 and the second surface 312 D is satisfied, where 0.04 mm2≤ D*H ≤ 0.81 mm2. D*H can take on several values ​​between 0.04 mm² and 0.81 mm², e.g. 0.04 mm², 0.06 mm², 0.1 mm², 0.2 mm², 0.3 mm², 0.4 mm², 0.5 mm², 0.6 mm², 0.64 mm², 0.7 mm², 0.81 mm² etc. If D*H < 0.04 mm², the thickness of at least D and H is too small, the end cap 3 has poor deformation resistance, and it is prone to deformation. If D*H > 0.81 mm², the thickness of at least D and H is too large, and the end cap 3 occupies a large amount of space. Therefore, 0.04 mm² ≤ D*H ≤ 0.81 mm² can, on the one hand, improve the deformation resistance of the end cap 3 and, on the other hand, prevent the end cap 3 from taking up too much space. In some embodiments, 0.06 mm2≤ D*H ≤ 0.64 mm2 is fulfilled. In this embodiment, D*H can take on several values ​​between 0.06 mm² and 0.64 mm², e.g. 0.06 mm², 0.1 mm², 0.15 mm², 0.2 mm², 0.25 mm², 0.3 mm², 0.35 mm², 0.4 mm², 0.45 mm², 0.5 mm², 0.55 mm², 0.6 mm², 0.64 mm², etc. In this embodiment, 0.06 mm² ≤ D*H ≤ 0.64 mm² can, on the one hand, further improve the deformation resistance of the end cap 3 and, on the other hand, reduce the volume occupied by the end cap 3. If D*H > 0.64 mm² and the reinforcement section 32 is formed by stamping, the reinforcement section 32 is stretched too much, which leads to a weakening of the strength of the reinforcement section 32. Therefore, D*H ≤ 0.64 mm² can improve the strength of the reinforcement section 32. In some embodiments, 0.25 mm ≤ H ≤ 0.8 mm; and / or 0.25 mm ≤ D ≤ 0.8 mm. H can take on several values ​​between 0.25 mm and 0.8 mm, e.g., 0.25 mm, 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm, 0.5 mm, 0.55 mm, 0.6 mm, 0.65 mm, 0.7 mm, 0.75 mm, 0.8 mm, etc. D can take on several values ​​between 0.25 mm and 0.8 mm, e.g., 0.25 mm, 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm, 0.5 mm, 0.55 mm, 0.6 mm, 0.65 mm, 0.7 mm, 0.75 mm, 0.8 mm, etc. For H < 0.25 mm, the reinforcing section 32 projects a smaller height from the first surface 311, and its reinforcing effect on the cap body 31 is low. For H > 0.8 mm, the reinforcing section 32 projects a greater height from the first surface 311, and it occupies a larger space. Therefore, for 0.25 mm ≤ H ≤ 0.8 mm, the reinforcing effect of the reinforcing section 32 on the cap body 31 can be improved, and the space occupied by the reinforcing section 32 can be reduced. For D < 0.25 mm, the distance between the first surface 311 and the second surface 312 is small, the deformation resistance of the cap body 31 is poor, and its strength is also low. For D > 0.8 mm, the thickness of the cap body 31 is relatively large, and the cap body 31 takes up a lot of space.Therefore, at 0.25 mm ≤ H ≤ 0.8 mm, on the one hand the deformation resistance of the cap body 31 and the strength of the cap body 31 can be improved, and on the other hand the space occupied by the cap body 31 can be reduced. In some embodiments, as shown in Fig. 10, Fig. 10 shows a partially enlarged view of B of the end cap 3 in Fig. 8. The reinforcement section 32 has a side wall 326 and a bottom wall 327, wherein the side wall 326 encloses the bottom wall 327, and the side wall 326 and the bottom wall 327 together form a first recess section 313, wherein the maximum thickness of the side wall 326 is L1, and the maximum thickness of the bottom wall 327 is L2. Along the thickness direction Z, there is a distance between the first surface 311 and the second surface 312 D, where L1 ≤ D, L2 ≤ D. The bottom wall 327 is a wall provided in the thickness direction Z of the reinforcement section 32. In the thickness direction Z, the bottom wall 327 is located opposite the opening of the first recess section 313. The side wall 326 is the portion of the reinforcement section 32 that encloses the bottom wall 327, and the extension plane of the side wall 326 corresponds to the shape of the first recess section 313. The thickness of the side wall 326 can be uniform or non-uniform. If the side wall 326 has a uniform thickness, its maximum thickness is equal to its minimum thickness. The thickness of the bottom wall 327 can also be uniform or non-uniform. If it has a uniform thickness, its maximum thickness is equal to its minimum thickness. In the embodiment shown in Fig. 10, the thickness of the side wall 326 is uneven and gradually decreases along a depth direction of the first recess section 313; the thickness of the bottom wall 327 is also uneven and gradually increases along a width direction of the first recess section 313 from the center to both ends. Since L1 and L2 are both no larger than D, the maximum thickness of the side wall 326 and the maximum thickness of the bottom wall 327 do not exceed the distance between the first surface 311 and the second surface 312. This simplifies the forming process, and the reinforcement section 32 can be formed by stamping, thus simplifying the forming procedure. In some embodiments, the minimum thickness of the bottom wall is 327 L3 and the minimum thickness of the side wall is 326 L4, where D- L3≤ 0.2 mm is satisfied; and / or where D- L4≤ 0.2 mm is satisfied. D-L3 can take on multiple values ​​from 0 to 0.2 mm, e.g., 0.01 mm, 0.04 mm, 0.08 mm, 0.1 mm, 0.12 mm, 0.16 mm, 0.2 mm, etc. D-L4 can take on multiple values ​​from 0 to 0.2 mm, e.g., 0.01 mm, 0.04 mm, 0.08 mm, 0.1 mm, 0.12 mm, 0.16 mm, 0.2 mm, etc. If D-L3 > 0.2 mm, the minimum thickness of the bottom wall 327 is small and its strength is poor, making it susceptible to damage. Therefore, D-L3 ≤ 0.2 mm ensures sufficient strength for the bottom wall 327. Similarly, if D-L4 > 0.2 mm, the minimum thickness of the side wall 326 is small and its strength is poor, making it susceptible to damage. Therefore, D-L4 ≤ 0.2 mm ensures sufficient strength for the side wall 326. In some embodiments, as shown in Figs. 5, 6 and 8, the cap body 31 has a pressure relief area 314, wherein at least a portion of the first surface 311 is located in the pressure relief area 314, the cap body 31 being provided with a notched groove 315, the notched groove 315 being provided along an edge of the pressure relief area 314, the pressure relief area 314 being configured such that, upon pressure relief of the battery cell 10, it opens with the notched groove 315 acting as a boundary. A reinforcement section 32 is provided in the pressure relief area 314. The pressure relief area 314 is the part of the cap body 31 that can be opened by means of the notched groove 315, which acts as a boundary for pressure relief of the battery cell 10. After opening the pressure relief area 314, the cap body 31 can form an outlet opening at the location corresponding to the pressure relief area 314, and the emissions inside the battery cell 10 can be discharged through the outlet opening to relieve the pressure inside the battery cell 10. The first surface 311 can be located completely or partially within the pressure relief area 314. The remaining portion of the cap body 31 at the location of the notched groove 315 constitutes a weak section. The strength of this weak section is lower than that of other areas of the cap body 31, making the cap body 31 at the location of the notched groove 315 even weaker and more susceptible to damage. When the pressure inside the battery cell 10 reaches the explosion pressure, the weak section is destroyed by emissions (electrolyte solution, gas, etc.) inside the battery cell 10, causing the pressure relief area 314 to open outwards. The pressure relief area 314 can be opened by unfolding or releasing it. The notched groove 315 can be provided on the first surface 311 or on the second surface 312. The notched groove 315 can have various shapes, such as... B. ring-shaped, arc-shaped, U-shaped, H-shaped, etc.The notched groove 315 can be formed by various processes, such as punching, milling, etc. The pressure relief area 314 enables the end cap 3 to perform a pressure relief function. The pressure relief area 314 can be opened with the notched groove 315 as its boundary and has a large pressure relief area. The reinforcement section 32 is located within the pressure relief area 314. The reinforcement section 32 strengthens the pressure relief area 314 and improves its resistance to deformation. Changes in the internal pressure of the battery cell 10 make deformation of the pressure relief area 314 less likely, thus reducing the risk of the pressure relief area 314 opening during normal operation of the battery cell 10. In some embodiments, the notched groove 315 is a groove that extends along a closed path. The closed path can take on various shapes, e.g. circular path, rectangular path, elliptical path, etc. During pressure relief of battery cell 10, the pressure relief area 314 can be opened so that it separates from the outside of battery cell 10. This increases the pressure relief area of ​​battery cell 10, which improves the pressure relief efficiency. In some embodiments, the notched groove 315 is ring-shaped. Understandably, the notched groove 315 is a groove that extends along a circular path. The structure of the annular notched groove 315 is simple and easy to form. In some embodiments, the cap body 31 is circular, with the notched groove 315 and the cap body 31 being arranged coaxially. The cap body 31 has a circular structure. Understandably, the outer edge of the cap body 31 is circular, and the end cap 3 of this structure is a circular end cap. The notched groove 315 is provided coaxially with the cap body 31, that is, the center line of the notched groove 315 coincides with the center line of the cap body 31. In this embodiment, the notched groove 315 is provided coaxially to the cap body 31, and the pressure relief area 314 defined by the notched groove 315 is located in the central area of ​​the cap body 31, which facilitates timely opening of the pressure relief area 314 for pressure relief. In some embodiments, the first surface 311 faces the interior of the housing body 1, with the notched groove 315 being provided on the first surface 311. After the end cap 3 closes the opening of the housing body 1, the first surface 311 faces the interior of the housing body 1. Since the notched groove 315 is provided on the first surface 311, and the first surface 311 faces the interior of the housing body 1, the notched groove 315 faces the interior of the battery cell 10 and is not exposed to the exterior of the battery cell 10. This reduces the risk of oxidation of the area where the notched groove 315 is located on the cap body 311 due to contact with the exterior of the battery cell 10. Since the reinforcement section 32 is provided on the first surface 311, and the first surface 311 faces the interior of the housing body 1, the reinforcement section 32 can utilize the interior of the battery cell 10 and cannot occupy any exterior space of the battery cell 10. In some embodiments, as shown in Fig. 6, the reinforcing section 32 comprises a first arc section 321 and a second arc section 322 projecting from the first surface 311, with an opening of the first arc section 321 facing away from an opening of the second arc section 322. A minimum distance between an end section of the first arc section 321 in a direction of extension and the notched groove 315 is S1, where S1 > 0.5 mm; and / or a minimum distance between an end section of the second arc section 322 in a direction of extension and the notched groove 315 is S2, where S2 > 0.5 mm. S1 can take on several values ​​greater than 0.5 mm, e.g., 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, etc. S2 can take on several values ​​greater than 0.5 mm, e.g., 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, etc. S1 and S2 can be equal or unequal. In the embodiment shown in Fig. 6, the first arc section 321 has two end sections in its direction of extension, one end section being an end of the first arc segment 3211 facing away from the connection area 323, and the other end section being an end of the second arc segment 3212 facing away from the connection area 323. The minimum distance between the end of the first arc segment 3211 facing away from the connection area 323 and the notched groove 315, as well as the minimum distance between the end of the second arc segment 3212 facing away from the connection area 323 and the notched groove 315, is S1 in each case. The second arc section 322 has two end sections in its direction of extension, one end section being an end of the third arc segment 3221 facing away from the connection area 323, and the other end section being an end of the fourth arc segment 3222 facing away from the connection area 323.The minimum distance between the end of the third arc segment 3221 facing away from the connection area 323 and the notched groove 315, as well as the minimum distance between the end of the fourth arc segment 3222 facing away from the connection area 323 and the notched groove 315, is S2 in each case. S1 > 0.5 mm, thereby reducing the influence of the first arc section 321 on the notched groove 315 and reducing the risk of the notched groove 315 being compressed because the end section of the first arc section 321 is too close to the notched groove 315. S2 > 0.5 mm, thereby reducing the influence of the second arc section 322 on the notched groove 315 and reducing the risk of the notched groove 315 being compressed because the end section of the second arc section 322 is too close to the notched groove 315. In some embodiments, as shown in Fig. 8 and Fig. 11, Fig. 11 shows a partially enlarged view of C of the battery cell 10 in Fig. 4. The cap body 31 comprises a main body section 316 and a connecting section 317, wherein the main body section 316 has a first surface 311, wherein the connecting section 317 is provided around an outer edge of the main body section 316, wherein in a thickness direction Z the connecting section 317 projects from the main body section 316 in a direction facing the interior of the housing body 1, wherein the connecting section 317 serves to extend into the housing body 1 and to establish a positioning fit with the housing body 1. The connecting section 317 is the part of the cap body 31 that forms a positioning fit with the housing body 1, and the main body section 316 is the part of the cap body 31 that is located on the inside of the connecting section 317. In embodiments where the end cap 3 is circular, the main body section 316 can be a circular area located in the central region of the cap body 31, and the connecting section 317 can be an annular area that surrounds the outside of the main body section 316. The connecting section 317 and the main body section 316 can form a single-piece molded structure. The reinforcing section 32 is provided on the main body section 316 and can reinforce the main body section 316. After the end cap 3 is assembled with the housing body 1, the outer circumferential surface of the connecting section 317 comes into contact with the inner circumferential surface of the housing body 1, thereby achieving a positioning fit between the connecting section 317 and the housing body 1. The outer circumferential surface of the connecting section 317 and the inner circumferential surface of the housing body 1 both extend in the thickness direction Z. For example, the outer circumferential surface of the connecting section 317 and the inner circumferential surface of the housing body 1 are the cylindrical surfaces that both extend in the thickness direction Z. In one embodiment, where the end cap 3 is electrically connected to the first electrode tab 21 of the electrode arrangement 2, the connecting section 317 can be the part of the end cap 3 that is available for electrical connection to the first electrode tab 21. In some embodiments, the connecting section 317 is directly connected to the first electrode tab 21, for example by welding the connecting section 317 to the electrode tabs; in other embodiments, as shown in Fig. 11, the connecting section 317 is indirectly connected to the first electrode clamp 21 via the collector component 5, for example by welding the collector component 5 to the first electrode tab 21 and subsequently welding the connecting section 317 to the collector component 5. In this embodiment, the connecting section 317 projects from the main body section 316 in a direction facing the interior of the housing body 1, and the connecting section 317 can form a positioning fit with the housing body 1, which improves the assembly efficiency of the end cap 3 and the housing body 1. In some embodiments, as shown in Fig. 8 and Fig. 11, the connecting section 317 has a third surface 3171 facing the interior of the housing body 1 in the thickness direction Z, wherein the first surface 311 faces the interior of the housing body 1, and the reinforcing section 32 does not project from the third surface 3171 in the direction facing the interior of the housing body 1. The third surface 3171 is the inner surface of the connecting section 317, which faces the interior of the housing body 1 in the thickness direction Z. The third surface 3171 can be an annular surface. In an embodiment where the connecting section 317 is directly connected to the first electrode tab 21, the third surface 3171 rests against the first electrode tab 21; as shown in Fig. 11, in an embodiment where the connecting section 317 is connected to the first electrode tab 21 via the collector component 5, the third surface 3171 rests against the collector component 5. Along the thickness direction Z, the surface of the reinforcement section 32 facing the interior of the housing body 1 can be flush with the third surface 3171 or be further away from the electrode arrangement 2 located inside the housing body 1 than the third surface 3171, so that the reinforcement section 32 does not project beyond the third surface 3171 in the direction facing the interior of the housing body 1. In this embodiment, the reinforcing section 32 does not project beyond the third surface 3171 in the direction facing the interior of the housing body 1. If the third surface 3171 of the connecting section 317 is in contact with the internal components of the battery cell 10 (e.g., the first electrode tab 21 or the collector component 5), it is unlikely that the reinforcing section 32 will interfere with the internal components of the battery cell 10. In some embodiments, the body section 316 has a fourth surface 3161 and a fifth surface 3162 in the thickness direction Z, which are opposite each other, and the connecting section 317 projects from the fourth surface 3161. The main body section 316 has a pressure relief area 314, wherein the main body section 316 is provided with a notched groove 315 and a second recess section 3163, the notched groove 315 being provided along an edge of the pressure relief area 314, the pressure relief area 314 being configured such that, upon pressure relief of the battery cell 10, it opens with the notched groove 315 acting as a boundary, the second recess section 3163 being recessed from the fifth surface 3162 in a direction facing the fourth surface 3161.The projection of the underside of the second recess section 3163 in the thickness direction Z covers the notched groove 315. The fourth surface 3161 faces the interior of the housing body 1. The fourth surface 3161 and the first surface 311 can be identical surfaces of the main body section 316. In the embodiment shown in Fig. 8, the fourth surface 3161 and the first surface 311 can also be two surfaces that are spaced apart in the thickness direction Z. The fifth surface 3162 is the surface of the main body section 316 that faces away from the housing body 1 in the thickness direction Z. The fifth surface 3162 can be an annular surface that encloses the outside of the second recess section 3163. The connecting section 317 projects from the fourth surface 3161 in the direction facing the interior of the housing body 1. The second recess section 3163 can be a cylindrical groove, a cuboid groove, etc. The notched groove 315 can be provided on the first surface 311 or on the bottom surface of the second recess section 3163. In the embodiment shown in Fig. 8, the notched groove 315 is provided on the first surface 311. The second recess section 3163 creates a certain distance between the pressure relief area 314 and the fifth surface 3162. When the fifth surface 3162 is in contact with an external component, the influence of the external component on the pressure relief area 314 is reduced, allowing the pressure relief area 314 to open outwards when the battery cell 10 is depressurized. This reduces the risk of the pressure relief area 314 not opening properly due to obstruction by the external component. Examples of external components include the bottom wall 327 of the housing 20, thermal management components, etc. In some embodiments, the fifth surface 3162 along the thickness direction Z is a surface of the end cap 3 that is furthest from the housing body 1. The fifth surface 3162 is the surface of the end cap 3 that is furthest from the housing body 1 along the thickness direction Z, and it is also the surface of the battery cell 10 that is furthest from the housing body 1 along the thickness direction Z. In the thickness direction Z, the fifth surface 3162 is farther from the housing body 1 than the connecting section 317. The fifth surface 3162 serves as a support surface for the battery cell 10. When the battery cell 10 is placed on an external component, the fifth surface 3162 touches the external component and thus ensures the stability of the battery cell 10 on the external component. In some embodiments, at a location where the main body section 316 corresponds to the second recess section 3163, a projection section 3164 is formed which projects from the fourth surface 3161, wherein a surface of the projection section 3164 facing away from the fourth surface 3161 is a first surface 311. The shape of the projecting section 3164 corresponds to the shape of the second recessed section 3163. In the example where the second recessed section 3163 is a cylindrical groove, the projecting section 3164 can be a cylindrical projection extending from the fourth surface 3161. The second recessed section 3163 can be formed by punching on the fifth surface 3162, thereby forming a projecting section 3164 extending from the fourth surface 3161. In this embodiment, the projecting section 3164 can increase the strength of the area of ​​the second recessed section 3163 in the main body section 316. In some embodiments, the bottom surface of the second recess section 3163 is provided along the thickness direction Z opposite the first surface 311. The main body section 316 is provided with a first recess section 313, wherein the first recess section 313 is recessed from the bottom surface of the second recess section 3163 in a direction facing the first surface 311, and wherein a reinforcing section 32 is formed at a location of the main body section 316 corresponding to the first recess section 313, projecting from the first surface 311. The bottom surface of the second recess section 3163 is the second surface 312 of the cap body 31. In the thickness direction Z, the distance between the fourth surface 3161 and the fifth surface 3162 can be equal to the distance between the first surface 311 and the second surface 312. During the forming process, a first recess section 313 can be formed in the base surface of the second recess section 3163 by punching, thereby forming a reinforcing section 32 that projects from the first surface 311. The forming of the reinforcing section 32 is carried out in a simple manner. The first recess section 313 forms a recess structure in the main body section 316 at a point in the reinforcing section 32, thereby giving the reinforcing section 32 better deformation resistance and improving its reinforcing effect on the main body section 316. In some embodiments, as shown in Fig. 8 and Fig. 11, the cap body 31 further comprises an edge section 318, wherein the edge section 318 encloses an outer edge of the connecting section 317, and wherein the edge section 318 is connected at one end to an opening of the housing body 1. The edge section 318 is the part that connects the cap body 31 to the housing body 1. The edge section 318 and the housing body 1 can be joined in various ways, for example by welding or gluing. The edge section 318 can be an annular structure that encloses the outside of the connecting section 317. In the thickness direction Z, the edge section 318 has a stepped surface 3181 facing the housing body 1. The stepped surface 3181 is connected to the outer circumferential surface of the connecting section 317. The stepped surface 3181 serves to abut the opening of the housing body 1 at one end, so that the cap body 31 closes the opening of the housing body 1. In the embodiment where the fifth surface 3162 is the surface of the end cap 3 furthest from the housing body 1 in the thickness direction Z, the fifth surface 3162 can be located further from the housing body 1 than the edge section 318 in the thickness direction Z, resulting in a height difference between the fifth surface 3162 and the edge in the thickness direction Z. This makes it less likely that the welding slag produced when welding the edge section 318 to the housing body 1 will protrude from the fifth surface 3162, thus ensuring the flatness of the fifth surface 3162 and the stability of the battery cell 10 when the fifth surface 3162 serves as the support surface. When assembling the end cap 3 and the housing body 1, after the connecting section 317 has been positioned and fitted to the housing body 1, the edge section 318 can be positioned at one end against an opening of the housing body 1, and it can be made easier to connect the edge section 318 at one end to the opening of the housing body 1, for example by welding the edge section 318 to the end with the opening of the housing body 1. In some embodiments, the end cap 3 consists of at least one of steel, stainless steel or nickel-plated steel. The end cap 3 can be made of steel, stainless steel, nickel-plated steel, or of two or three materials (steel, stainless steel, and nickel-plated steel). In an embodiment where the end cap 3 is made of nickel-plated steel, the nickel layer on the end cap 3 can be damaged at the location of the notched groove 315, and the end cap 3 oxidizes easily at the location of the notched groove 315. In an embodiment where the first surface 311 faces the interior of the housing body 1 and the notched groove 315 is provided on the first surface 311, the notched groove 315 is not exposed to the outside of the battery cell 10. This reduces the risk of oxidation of the area where the notched groove 315 is located on the end cap 3, effectively improving the service life of the end cap 3. In this embodiment, the end cap 3 is characterized by higher strength and stiffness as well as a longer service life. The embodiments of the present application provide a battery cell 10 comprising a housing body 1 and a cap 3 according to one of the embodiments. The housing body 1 has an opening, and the cap body 31 closes the opening. In some embodiments, the first surface 311 faces the interior of the housing body 1 along the thickness direction Z. In other embodiments, the first surface 311 can also be the surface of the cap body 31 that faces away from the housing body 1 in the thickness direction Z. The embodiments of the present application provide a battery 100 comprising a battery cell 10 according to one of the above embodiments. The embodiments of the present application provide a power-consuming device comprising a battery 100 according to one of the above embodiments. As shown in Figures 5, 6, 7, 8 to 9, the embodiments of the present application provide a circular end cap, wherein the end cap 3 can be used to close the opening of the housing body 1 of the battery cell 10. The end cap 3 comprises a cap body 31 and a reinforcing section 32, the reinforcing section 32 being provided on the cap body 31. The cap body 31 comprises a main body section 316, a connecting section 317, and an edge section 318. The connecting section 317 is provided around the outer circumference of the main body section 316, while the edge section 318 is provided around the outer circumference of the connecting section 317. It is connected such that it extends into the housing body 1 and forms a positioning fit with the housing body 1. The edge section 318 serves to be connected at one end to the opening of the housing body 1.Along the thickness direction Z of the cap body 31, the main body section 316 has a fourth surface 3161 and a fifth surface 3162, which are opposite each other. The connecting section 317 projects from the fourth surface 3161. The fifth surface 3162 is the surface of the end cap 3 furthest from the housing body 1. Both the connecting section 317 and the main body section 316 are closer to the housing body 1 than the fifth surface 3162.The main body section 316 is provided with a notched groove 315 and a second recess section 3163, the second recess section 3163 being recessed from the fifth surface 3162 in a direction facing the fourth surface 3161, the notched groove 315 being annular, the notched groove 315 defining the pressure relief area 314, the pressure relief area 314 being configured such that, upon pressure relief of the battery cell 10, it opens with the notched groove 315 as a boundary, the projection of a bottom surface of the second recess section 3163 in the thickness direction Z covering the notched groove 315. At the location of the second recess section 3163 on the main body section 316, a projection section 3164 is formed, which projects from the fourth surface 3161. The surface of the projection section 3164 facing away from the fourth surface 3161 is the first surface 311.The first surface 311 has a notched groove 315. The bottom surface of the second recess section 3163 is the second surface 312. The second surface 312 and the first surface 311 are arranged opposite each other in the thickness direction Z. The main body section 316 is further provided with a first recess section 313, wherein the first recess section 313 is recessed from the second surface 312 in a direction facing the first surface 311, and wherein a reinforcing section 32 is formed at a location of the main body section 316 corresponding to the first recess section 313, projecting from the first surface 311. The reinforcement section 32 comprises a first arc section 321 and a second arc section 322, which are provided on the first surface 311, wherein an opening of the first arc section 321 faces away from an opening of the second arc section 322. The first arc section 321 and the second arc section 322 are connected to each other and form a connection area 323, wherein the connection area 323 has a first end 3231 and a second end 3232 opposite each other, wherein the first arc section 321 comprises a first arc segment 3211 and a second arc segment 3212, wherein the second arc section 322 comprises a third arc segment 3221 and a fourth arc segment 3222, wherein the first arc segment 3211 and the third arc segment 3221 are connected to the first end 3231, and wherein the second arc segment 3212 and the fourth arc segment 3222 are connected to the second end 3232.The distance between the first arc segment 3211 and the third arc segment 3221 gradually increases in a direction from the second end 3232 to the first end 3231. The distance between the second arc segment 3212 and the fourth arc segment 3222 gradually increases in a direction from the first end 3231 to the second end 3232. The width of the connecting area 323 gradually increases in a direction from a midpoint of the connecting area 323 to the first end 3231 and to the second end 3232.The first arc segment 3211 has a first side surface 3211a facing the third arc segment 3221, wherein the third arc segment 3221 has a third side surface 3221a facing the first arc segment 3211, the first side surface 3211a and the third side surface 3221a being connected by a first rounded corner surface 324; and / or the second arc segment 3212 has a second side surface 3212a facing the fourth arc segment 3222, wherein the fourth arc segment 3222 has a fourth side surface 3222a facing the second arc segment 3212, the second side surface 3212a and the fourth side surface 3222a being connected by a second rounded corner surface 325.The first arc segment 3211 and the third arc segment 3221 are arranged symmetrically; and / or the second arc segment 3212 and the fourth arc segment 3222 are arranged symmetrically; and / or the first arc segment 3211 and the second arc segment 3212 are arranged symmetrically; and / or the third arc segment 3221 and the fourth arc segment 3222 are arranged symmetrically. A central angle of the first arc segment 321 is θ1, where θ1 > 90°; and / or a central angle of the second arc segment 322 is θ2, where θ2 > 90°. Furthermore, the reinforcing section 32 projects in the thickness direction Z by a height H from the first surface 311, wherein a distance D between the first surface 311 and the second surface 312 is satisfied, where 0.04 mm² ≤ D*H ≤ 0.81 mm². A minimum distance S1 between an end section of the first arc section 321 in a direction of extension and the notched groove 315 is satisfied, where S1 > 0.5 mm; and / or a minimum distance S2 between an end section of the second arc section 322 in a direction of extension and the notched groove 315 is satisfied, where S2 > 0.5 mm. It should be noted that the embodiments of the present application and the features in the embodiments can be combined without conflict. The foregoing statements represent only a preferred embodiment of the present application and are not intended to limit the present application, which may be subject to various modifications and alterations for the person skilled in the art. All changes, equivalent replacements, improvements, etc., made within the spirit and principles of the present application fall within the scope of protection of the present application. Reference symbol list: 1 Housing body; 11 Wall section; 2 Electrode assembly; 21 First electrode socket; 22 Second electrode tab; 3 End cap; 31 Cap body; 311 First surface; 312 Second surface; 313 First recess section; 314 Pressure relief area; 315 Notched groove; 316 Main body section; 3161 Fourth surface; 3162 Fifth surface; 3163 Second recess section; 3164 Projection section; 317 Connecting section; 3171 Third surface; 318 Edge section; 3181 Step surface; 32 Reinforcement section; 321 First arc section; 3210 First arc surface; 3211 First arc segment; 3211a First side surface; 3212 Second arc segment; 3212a Second side surface; 322 Second arc section; 3220 Second arc face; 3221 Third arc segment; 3221a Third side face; 3222 Fourth arc segment; 3222a Fourth side face; 323 Connection area; 3231 First end; 3232 Second end; 324 First rounded corner face; 325 Second rounded corner face; 326 Side wall; 327 Bottom wall;4 Electrode clamp; 5 Collector component; 10 Battery cell; 20 Box; 201 First section; 202 Second section; 100 Battery; 200 Control unit; 300 Motor; 1000 Vehicle; O Center point; F First reference surface; G Second reference surface; I First connecting line; K Second connecting line; M Third connecting line; N Fourth connecting line; X First direction; Z Thickness direction.;

Claims

End cap for a battery cell, comprising: a cap body, wherein the cap body is configured to close an opening of a housing body of the battery cell, wherein the cap body has a first surface in a thickness direction of the cap body; a reinforcing section, wherein the reinforcing section projects from the first surface, wherein the reinforcing section is configured to reinforce the cap body. End cap according to claim 1, wherein the reinforcement section comprises a first arc section and a second arc section projecting from the first surface, wherein an opening of the first arc section faces away from an opening of the second arc section. End cap according to claim 2, wherein the first arc section and the second arc section are connected to each other and form a connection area, the connection area having a first end and a second end opposite each other, wherein the first arc section comprises a first arc segment and a second arc segment, wherein the second arc section comprises a third arc segment and a fourth arc segment, wherein the first arc segment and the third arc segment are connected to the first end, and wherein the second arc segment and the fourth arc segment are connected to the second end; wherein a distance between the first arc segment and the third arc segment gradually increases in a direction from the second end to the first end; wherein a distance between the second arc segment and the fourth arc segment gradually increases in a direction from the first end to the second end. End cap according to claim 3, wherein the width of the connection area gradually increases in one direction from a central point of the connection area to the first end and to the second end. End cap according to claim 4, wherein the cap body is circular, wherein a center line of the cap body passes through a central point. End cap according to one of claims 3 to 5, wherein the first arc segment has a first side surface facing the third arc segment, wherein the third arc segment has a third side surface facing the first arc segment, wherein the first side surface and the third side surface are connected by a first rounded corner surface; and / or wherein the second arc segment has a second side surface facing the fourth arc segment, wherein the fourth arc segment has a fourth side surface facing the second arc segment, wherein the second side surface and the fourth side surface are connected by a second rounded corner surface. End cap according to one of claims 3 to 6, wherein the first arc segment and the third arc segment are provided symmetrically; and / or wherein the second arc segment and the fourth arc segment are provided symmetrically; and / or wherein the first arc segment and the second arc segment are provided symmetrically; and / or wherein the third arc segment and the fourth arc segment are provided symmetrically. End cap according to one of claims 2 to 7, wherein a central angle of the first arc section θ1 is satisfied, where θ1> 90°; and / or wherein a central angle of the second arc section θ2 is satisfied, where θ2> 90°. End cap according to one of claims 1 to 8, wherein the reinforcement section is formed integrally with the cap body. End cap according to one of claims 1 to 9, wherein the cap body has a second surface in the thickness direction which is opposite the first surface, wherein the cap body is provided with a first recess section, wherein the first recess section is recessed from the second surface in a direction facing the first surface, and wherein a reinforcement section is formed at a place of the cap body which corresponds to the first recess section and which projects from the first surface. End cap according to claim 10, wherein the reinforcement section projects in the thickness direction by a height H from the first surface, wherein a distance between the first surface and the second surface D is satisfied, wherein 0.04 mm2≤ D*H ≤ 0.81 mm2 is satisfied. End cap according to claim 11, wherein 0.06 mm2≤ D*H ≤ 0.64 mm2 is satisfied. End cap according to claim 11 or 12, wherein 0.25 mm ≤ H ≤ 0.8 mm; and / or wherein 0.25 mm ≤ D ≤ 0.8 mm. End cap according to one of claims 10 to 13, wherein the reinforcement section has a side wall and a bottom wall, wherein the side wall encloses the bottom wall, wherein the side wall and the bottom wall together form a first recess section, wherein a maximum thickness of the side wall is L1, wherein a maximum thickness of the bottom wall is L2; ​​wherein along the thickness direction Z there is a distance between the first surface and the second surface D, wherein L1≤ D, L2≤ D is satisfied. End cap according to claim 14, wherein the minimum thickness of the bottom wall is L3 and the minimum thickness of the side wall is L4, wherein D - L3≤ 0.2 mm is satisfied; and / or wherein D - L4≤ 0.2 mm is satisfied. End cap according to one of claims 1 to 15, wherein the cap body has a pressure relief area, wherein at least a part of the first surface is located in the pressure relief area, wherein the cap body is provided with a notched groove, wherein the notched groove is provided along an edge of the pressure relief area, wherein the pressure relief area is configured such that, when the battery cell is pressure relieved, it opens with the notched groove as a boundary; wherein a reinforcement section is provided in the pressure relief area. End cap according to claim 16, wherein the notched groove is a groove extending along a closed track. End cap according to claim 16 or 17, wherein the notched groove is annular. End cap according to claim 18, wherein the cap body is circular, wherein the notched groove and the cap body are provided coaxially. End cap according to one of claims 16 to 19, wherein the first surface faces the interior of the housing body, wherein the notched groove is provided on the first surface. End cap according to any one of claims 16 to 20, wherein the reinforcing section comprises a first arc section and a second arc section projecting from the first surface, wherein an opening of the first arc section faces away from an opening of the second arc section; wherein a minimum distance between an end section of the first arc section in a direction of extension and the notched groove S1 is satisfied, wherein S1 > 0.5 mm; and / or wherein a minimum distance between an end section of the second arc section in a direction of extension and the notched groove S2 is satisfied, wherein S2 > 0.5 mm. End cap according to one of claims 1 to 21, wherein the cap body comprises a main body section and a connecting section, wherein the main body section has a first surface, wherein the connecting section is provided around an outer edge of the main body section, wherein in a thickness direction the connecting section projects from the main body section in a direction towards the interior of the housing body, wherein the connecting section serves to extend into the housing body and to create a positioning fit with the housing body. End cap according to claim 22, wherein the connecting section has a third surface facing the interior of the housing body in the thickness direction, wherein the first surface faces the interior of the housing body, and wherein the reinforcing section does not project from the third surface in the direction facing the interior of the housing body. End cap according to claim 22 or 23, wherein the body section has a fourth surface and a fifth surface opposite each other in the thickness direction, and the connecting section projects from the fourth surface; wherein the main body section has a pressure relief area, the main body section being provided with a notched groove and a second recessed section, the notched groove being provided along an edge of the pressure relief area, the pressure relief area being configured to open upon pressure relief of the battery cell with the notched groove acting as a boundary, the second recessed section being recessed from the fifth surface in a direction facing the fourth surface, the projection of the underside of the second recessed section covering the notched groove in the thickness direction. End cap according to claim 24, wherein the fifth surface along the thickness direction is a surface of the end cap that is furthest from the housing body. End cap according to claim 24 or 25, wherein at a location where the main body section corresponds to the second recess section a projection section is formed which projects from the fourth surface, wherein a surface of the projection section facing away from the fourth surface is a first surface. End cap according to one of claims 24 to 26, wherein the bottom surface of the second recess section is provided along the thickness direction Z opposite the first surface; wherein the main body section is provided with a first recess section, wherein the first recess section is recessed from the bottom surface of the second recess section in a direction facing the first surface, and wherein a reinforcement section is formed at a location of the main body section corresponding to the first recess section, which projects from the first surface. End cap according to one of claims 22 to 27, wherein the cap body further comprises an edge section, wherein the edge section encloses an outer edge of the connecting section, and wherein the edge section is connected at one end to an opening of the housing body. End cap according to any one of claims 1 to 28, wherein the end cap is made of at least one of steel, stainless steel or nickel-plated steel. Battery cell comprising: a housing body having an opening; an end cap according to any one of claims 1 to 29, wherein the cap body closes the opening. Battery compartment according to claim 30, wherein the first surface along the thickness direction faces the interior of the housing body. Battery comprising a battery cell according to claim 29 or 30. Power-consuming device comprising a battery according to claim 32.

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