Cap assembly, battery monomer and battery

Abstract

The utility model provides a cap assembly, a battery monomer and a battery, and relates to the technical field of batteries. The cap assembly comprises a cap. The cap comprises a top cover and an anti-explosion piece, the top cover is provided with a first side face and a second side face which are arranged oppositely, the anti-explosion piece is partially attached to the first side face, the periphery of the anti-explosion piece is provided with an edge part, the edge part is arranged on the periphery of the top cover, and the plane where the top face of the edge part is located does not exceed the plane where the second side face is located. According to the cap assembly, the plane where the edge portion of the anti-explosion piece is located does not exceed the plane where the second side face is located, so that the height of the periphery of the cap is reduced, and the total height of the periphery of the cap assembly is reduced. Therefore, the height size, matched with the cap assembly, of the steel shell can be reduced, so that the length of the flat section of the buckling edge is increased, the electric connection area between the flat section of the buckling edge and related parts is increased, and the operability and the stability of electric connection between the flat section of the buckling edge and the related parts are improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a cap assembly, a battery cell and a battery. Background Art

[0002] In the related art, the main structure of a battery cell includes a steel shell, a cap and an electrode assembly. The cap and the steel shell cover each other to define an installation cavity, and the electrode assembly is arranged in the installation cavity. The negative pole ear of the electrode assembly is electrically connected to the shell, so that the shell is negatively charged. The positive pole of the electrode assembly is electrically connected to the cap, so that the cap is positively charged. A sealing ring is arranged between the steel shell and the cap. In order to improve the sealing performance, the parts of the steel shell located on both sides of the sealing ring need to be rolled to form buckle edges and rolling grooves on the steel shell. The buckle edge is formed at the end of the steel shell and wraps the periphery of the sealing ring. The rolling groove is formed on the side of the steel shell away from the buckle edge of the sealing ring, and squeezes the sealing ring.

[0003] At present, the flat section of the negatively charged buckle edge is relatively short, which results in poor operability and poor stability of electrical connection between the flat section of the buckle edge and related components. Utility Model Content

[0004] The embodiments of the present application provide a cap assembly, a battery cell and a battery, which can improve the operability and electrical connection stability of the flat section of the buckle edge and related components.

[0005] In the first aspect, an embodiment of the present application provides a cap assembly, which includes a cap; the cap includes a top cover and an explosion-proof plate, the top cover has a first side surface and a second side surface arranged opposite to each other, the explosion-proof plate is partially attached to the first side surface, and the periphery of the explosion-proof plate is provided with an edge portion, the edge portion is arranged at the periphery of the top cover, and the plane where the top surface of the edge portion is located does not exceed the plane where the second side surface is located.

[0006] In one embodiment, the explosion-proof disk includes a body and a retaining ring arranged on the body, the body portion is attached to the first side, the edge portion is the retaining ring, one side of the retaining ring is connected to the body, and the other side of the retaining ring does not exceed the second side.

[0007] In one embodiment, the inner circumference of the retaining ring abuts against the outer circumference of the top cover.

[0008] In one embodiment, the body and the retaining ring are integrally formed.

[0009] In one embodiment, the cap assembly also includes a hole plate and a gasket, the hole plate is located on the side of the explosion-proof disk away from the top cover, the center of the hole plate is connected to the center of the explosion-proof disk, the gasket is located at the periphery of the hole plate, and the gasket is arranged between the hole plate and the explosion-proof disk.

[0010] In one embodiment, the cap assembly further comprises a sealing ring, the inner circumferential surface of the sealing ring is provided with a sealing groove, and the periphery of the top cover and the periphery of the explosion-proof disk are both inserted into the sealing groove.

[0011] In one embodiment, the sealing ring includes a main body and a supporting part connected in sequence, the sealing groove is arranged on the main body, the supporting part is located on the side of the orifice plate away from the top cover, and is arranged opposite to the periphery of the orifice plate along the axial direction of the sealing ring.

[0012] In one embodiment, the supporting portion is a conical ring structure, and the supporting portion has a large diameter end and a small diameter end, and the large diameter end is connected to the main body; along the axial direction of the sealing ring, the small diameter end is arranged opposite to the periphery of the orifice plate.

[0013] In a second aspect, an embodiment of the present application provides a battery cell, which includes a steel shell, an electrode assembly, and the aforementioned cap assembly. The steel shell has an opening; the electrode assembly is disposed in the steel shell; and the cap assembly blocks the opening. A buckle edge is disposed at the end of the steel shell near the opening, and the buckle edge has a flat section, which is located on the side of the top cover away from the explosion-proof disk, and the flat section is perpendicular to the axis of the explosion-proof disk.

[0014] In one embodiment, rolling grooves are provided on the outer circumferential surface of the steel shell.

[0015] In a third aspect, an embodiment of the present application further provides a battery, which includes a plurality of the aforementioned battery cells, and the plurality of battery cells are connected in series or in parallel.

[0016] Beneficial effects of the embodiments of the present application:

[0017] In the embodiment of the present application, by limiting the plane where the edge of the explosion-proof disk is located not to exceed the plane where the second side surface is located, the cap is set to a structure without an edge, thereby reducing the height dimension of the periphery of the cap and reducing the total height of the periphery of the cap assembly. As a result, the height dimension of the steel shell that matches the cap assembly can be reduced, so that the reduced dimension of this part can be added to the length of the flat section of the buckle edge, thereby increasing the electrical connection area between the flat section of the buckle edge and related components, and ultimately improving the operability and electrical connection stability of the flat section of the buckle edge and related components. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 It is a structural schematic diagram of a cap assembly in the related art;

[0020] Figure 2 It is a schematic diagram of the structure of the steel shell after groove rolling provided by the embodiment of the present application;

[0021] Figure 3 It is a schematic diagram of the structure of the steel shell after the edge is formed and buckled according to the embodiment of the present application;

[0022] Figure 4 is a schematic structural diagram of a cap assembly provided in an embodiment of the present application;

[0023] Figure 5 yes Figure 4 The enlarged view of point A in the middle;

[0024] Figure 6 is a structural schematic diagram of another cap assembly provided in an embodiment of the present application;

[0025] Figure 7 It is a schematic diagram of the cooperation between the periphery of a top cover and the periphery of an explosion-proof disk provided in an embodiment of the present application;

[0026] Figure 8 is a schematic diagram of the structure of the explosion-proof disk provided in an embodiment of the present application;

[0027] Fig. 9 It is a schematic diagram of the cooperation between the periphery of another top cover and the periphery of the explosion-proof disk provided in an embodiment of the present application;

[0028] Fig.10 is a schematic structural diagram of another cap assembly provided in an embodiment of the present application;

[0029] Fig.11 yes Fig.10 The enlarged view of point B in the middle;

[0030] Fig.12 is a schematic diagram of the structure of a battery cell provided in an embodiment of the present application;

[0031] Fig.13 It is a schematic diagram of the cooperation between the cap assembly and the steel shell provided in the embodiment of the present application;

[0032] Fig.14 is a comparison diagram of the increase in length of the buckle edge provided in the embodiment of the present application;

[0033] Fig.15 yes Fig.13 Enlarged view of point C in the middle.

[0034] Description of Figure Numbers:

[0035] 001-cap assembly;

[0036] 011-seal ring; 111-seal groove; 112-inclined surface; 113-main body; 114-supporting part; 1141-first conical section; 1142-second conical section;

[0037] 012-cap; 121-top cover; 1211-outer surface of the top cover; 122-explosion-proof disk; 1221-body; 1222-edge; 12221-inner surface of the retaining ring; 1223-edge;

[0038] 014-well plate;

[0039] 015-gasket;

[0040] 002- steel shell; 021- buckle edge; 211- flat section; 022- rolling groove; 023- opening;

[0041] 003-Electrode assembly. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of this application.

[0043] In addition, it should be understood that the specific embodiments described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In the present application, unless otherwise stated, the directional words used, such as "upper" and "lower", generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0044] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0045] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0046] The terms "comprises," "includes," or any other variation thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprises a ..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0047] In the description of the embodiments of the present application, words such as "example" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "example" or "for example" in the embodiments of the present application is not to be interpreted as being more preferred or having more advantages than another embodiment or design. The use of words such as "example" or "for example" is intended to present relative concepts in a clear manner.

[0048] Before introducing the cap assembly, battery cell and battery of the present application, the relevant background information of the embodiments of the present application is first introduced.

[0049] In the related art, the cap assembly includes a sealing ring and a cap. The cap includes a top cover and a bursting disk partially attached to the top cover. The sealing ring wraps the top cover and the periphery of the bursting disk. The cap has an edge wrapping structure. Specifically, the periphery of the bursting disk is provided with an edge wrapping the periphery of the top cover, such as Figure 1 As shown, Figure 1 Schematic diagram of the structure of the cap assembly in the related art. In order to improve the sealing between the cap assembly and the steel shell, after the cap assembly is installed in the steel shell, the steel shell needs to be grooved and sealed in sequence. After the groove is rolled, a groove is formed on the surface of the steel shell, such as Figure 2 As shown, Figure 2 : is a schematic diagram of the structure of the steel shell after the groove is rolled according to the embodiment of the present application; the distance between the upper edge of the groove and the end of the steel shell is L1. The sealing is to seal the end of the steel shell so that the end of the steel shell forms a buckle edge that wraps the sealing ring, such as Figure 3 As shown, Figure 3 It is a schematic diagram of the structure of the steel shell after the edge is formed and buckled according to the embodiment of the present application. Figure 3In the embodiment, after sealing, the dimension L1 is correspondingly changed into the height dimension L2, the fillet dimension L3 and the length L4 of the flat section of the buckle edge.

[0050] When the buckle edge is used as the negative terminal of the battery cell, its flat section length L4 is too small, which is not conducive to the electrical connection between the battery cells. If the size of L1 is simply increased, it will lead to increased material costs, changes in mold fixture size, process changes, etc. Therefore, how to increase the length of the flat section L4 of the buckle edge without increasing the size of L1 is the purpose of this application.

[0051] Based on this, the present application provides a cap assembly, a battery cell and a battery, which are described in detail below.

[0052] See also Figure 4 , Figure 4 : is a schematic diagram of the structure of the cap assembly 001 provided in an embodiment of the present application. The embodiment of the present application provides a cap assembly 001, the cap assembly 001 includes a cap 012, and the cap 012 includes a top cover 121 and an explosion-proof plate 122. The top cover 121 has a first side surface and a second side surface that are arranged opposite to each other. The explosion-proof plate 122 is partially attached to the first side surface. The periphery of the explosion-proof plate 122 is provided with an edge portion 1222, and the edge portion 1222 is arranged at the periphery of the top cover, and the plane where the top surface of the edge portion 1222 is located does not exceed the plane where the second side surface is located, such as Figure 5 As shown, Figure 5 yes Figure 4 Enlarged view of point A in the middle.

[0053] It can be understood that the cap assembly 001 also includes a sealing ring 011. A sealing groove 111 is provided on the inner circumference of the sealing ring 011, and the periphery of the top cover 121 and the periphery of the explosion-proof disk 122 are both inserted into the sealing groove 111. Figure 6 As shown, Figure 6 001 is a structural diagram of another cap assembly 001 provided in an embodiment of the present application. The sealing ring 011 has insulation properties. When the cap assembly 001 is applied to a battery cell, the sealing ring 011 insulates and isolates the top cover 121 and the explosion-proof plate 122 from the steel shell 002 of the battery cell.

[0054] The explosion-proof sheet 122 is a metal sheet with a weak structure. When the pressure inside the battery cell reaches a threshold, the pressure breaks the weak structure to release the pressure inside the battery cell. The top cover 121 serves as the positive electrode of the battery cell, and the explosion-proof sheet 122 is electrically connected to the top cover 121 to transmit the current and voltage of the positive electrode of the battery cell to the top cover 121.

[0055] In addition, the groove walls on both sides of the sealing groove 111 are respectively fitted with the top cover 121 and the explosion-proof disk 122 to form sealing surfaces on the top cover 121 and the explosion-proof disk 122 .

[0056] Exemplarily, the sealing ring 011 is an insulating rubber ring resistant to electrolyte corrosion. Only the periphery of the explosion-proof disc 122 is in contact with the periphery of the top cover 121. The explosion-proof disc 122 is a metal sheet with multiple notches. The middle part of the top cover 121 is convexly arranged to the side away from the explosion-proof disc 122, so as to form a buffer space for high-pressure fluid impact between the top cover 121 and the explosion-proof disc 122.

[0057] In this embodiment, the plane where the edge 1222 of the explosion-proof plate 122 is located is limited not to exceed the plane where the second side surface is located, so that the cap 012 is set to a structure without an edge. In this way, the height dimension of the periphery of the cap 012 is reduced, and the total height of the periphery of the cap assembly 001 is reduced. As a result, the height dimension of the steel shell that matches the cap assembly 001 can be reduced, so that the reduced dimension of this part can be increased to the length of the flat section 211 of the buckle edge 021, thereby increasing the electrical connection area between the flat section 211 of the buckle edge 021 and related components, and improving the operability and electrical connection stability of the flat section 211 of the buckle edge 021 and related components.

[0058] Among them, the height dimension of the steel shell that matches the cap assembly 001 is Figure 3 In addition, the length L4 of the flattened section 211 is ≥ 1 mm.

[0059] See also Figure 7 , Figure 7 1 is a schematic diagram of the cooperation between the periphery of a top cover 121 and the periphery of an explosion-proof plate 122 provided in an embodiment of the present application. In one embodiment, the explosion-proof plate 122 includes a main body 1221 and a retaining ring disposed on the main body 1221. The main body 1221 is partially attached to the first side surface. The edge portion is a retaining ring. One side of the retaining ring is connected to the main body 1221, and the other side of the retaining ring does not exceed the second side surface, and the inner peripheral surface 12221 of the retaining ring is in contact with the outer peripheral surface 1211 of the top cover. Among them, the structure of the inner peripheral surface 12221 of the retaining ring is as follows: Figure 8 As shown, Figure 8 Schematic diagram of the structure of the explosion-proof disk 122 provided in the embodiment of the present application.

[0060] It can be understood that the surface of the retaining ring includes an inner peripheral surface, an outer peripheral surface, a first end surface connected to the outer peripheral surface and one end of the inner peripheral surface, and a second end surface connected to the outer peripheral surface and the other end of the inner peripheral surface. Among them, the inner peripheral surface and the outer peripheral surface are parallel to the axis of the cap assembly 001, and the first end surface and the second end surface are perpendicular to the axis of the cap assembly 001. One side and the other side of the aforementioned retaining ring are the first end surface and the second end surface of the retaining ring respectively, and the first end surface is connected to the body 1221.

[0061] In addition, the maximum height dimension of the retaining ring is flush with the side of the periphery of the top cover 121 away from the explosion-proof disk 122. Fig. 9 As shown, Fig. 9It is a schematic diagram of the cooperation between the periphery of another top cover 121 and the periphery of the explosion-proof plate 122 provided in an embodiment of the present application.

[0062] Exemplarily, the main body 1221 and the retaining ring are integrally formed, and the retaining ring can be formed by stamping a metal sheet, or the retaining ring structure can be formed by rolling a metal sheet. The inner circumference 12221 of the retaining ring abuts against the outer circumference 1211 of the top cover, so that the inner circumference 12221 of the retaining ring and the outer circumference 1211 of the top cover are interference fit. Optionally, the interference amount of the interference fit is 0 to 0.5 mm, including but not limited to 0, 0.1 mm, 0.2 mm, 0.3 mm, and 0.5 mm. Therefore, by limiting the interference amount, it is possible to avoid excessive gaps, thereby avoiding insufficient sealing; and having a suitable interference amount facilitates the assembly of the top cover 121 and the explosion-proof plate 122.

[0063] In this embodiment, by abutting the inner circumference 12221 of the retaining ring with the outer circumference 1211 of the top cover, the friction force generated by the abutment can improve the stability of the fit between the top cover 121 and the explosion-proof plate 122, thereby improving the connection reliability between the top cover 121 and the explosion-proof plate 122.

[0064] See also Figure 6 In one embodiment, the end surface of the sealing ring 011 located at the end of the top cover 121 away from the explosion-proof plate 122 is a slope 112, and the distance between the slope 112 and the top cover 121 gradually increases along the direction close to the axis of the sealing ring 011.

[0065] It can be understood that, in order to facilitate electrical connection with related components, the flat section 211 of the buckle edge 021 is perpendicular to the axis of the explosion-proof disc 122. Based on this, in this embodiment, by setting the end face of the sealing ring 011 away from the explosion-proof disc 122 as the inclined surface 112, the end face of the sealing ring 011 away from the explosion-proof disc 122 can be pressed against the flat section 211 of the buckle edge 021, thereby increasing the pressure between the flat section 211 of the buckle edge 021 and the end face of the sealing ring 011 away from the explosion-proof disc 122, and then improving the sealing performance between the flat section 211 of the buckle edge 021 and the end face of the sealing ring 011 away from the explosion-proof disc 122.

[0066] See also Fig.10 , Fig.10 01 is a schematic diagram of the structure of another cap assembly 001 provided in an embodiment of the present application. In one embodiment, the cap assembly 001 further includes an orifice plate 014 and a gasket 015, wherein the orifice plate 014 is located on the side of the explosion-proof disc 122 away from the top cover 121, the center of the orifice plate 014 is connected to the center of the explosion-proof disc 122, the gasket 015 is located at the periphery of the orifice plate 014, and the gasket 015 is disposed between the orifice plate 014 and the explosion-proof disc 122.

[0067] It can be understood that the orifice plate 014 can be electrically connected to the positive busbar of the electrode assembly 003 .

[0068] Exemplarily, the gasket 015 is an annular structure, which is coaxially arranged with the sealing ring 011.

[0069] In this embodiment, the orifice plate 014 is insulated and supported from one side of the explosion-proof plate 122 by a gasket 015, so that except for the central portion where the explosion-proof plate 122 and the orifice plate 014 are connected to each other, there is a gap between the remaining portions. Thus, when the central portion of the orifice plate 014 is ruptured by the high-pressure gas in the battery cell, the electrical connection between the orifice plate 014 and the explosion-proof plate 122 can be disconnected, and then the battery cell can be disconnected from the circuit, thereby improving the safety of the battery cell.

[0070] See also Fig.11 , Fig.11 yes Fig.10 In one embodiment, the sealing ring 011 includes a main body 113 and a supporting portion 114 connected in sequence, the sealing groove 111 is provided on the main body 113, the supporting portion 114 is located on the side of the orifice plate 014 away from the top cover 121, and is provided opposite to the periphery of the orifice plate 014 along the axial direction of the sealing ring 011.

[0071] Exemplarily, the main body 113 and the supporting portion 114 are integrally formed, and specifically, may be integrally injection molded.

[0072] Since only the center of the orifice plate 014 is connected to the center of the explosion-proof plate 122, the connection stability between the two is poor. In particular, when the battery cell vibrates or shakes, the orifice plate 014 is easy to separate from the explosion-proof plate 122. Based on this, in this embodiment, by providing a supporting portion 114, when the rolling groove 022 is processed on the outer peripheral surface of the steel shell 002, the inner wall of the steel shell 002 located between the rolling groove 022 and the sealing ring 011 abuts against the supporting portion 114, and pushes the supporting portion 114 to move toward the orifice plate 014 and contact the orifice plate 014, so that the orifice plate 014 can be supported and limited by the supporting portion 114 to prevent it from separating from the explosion-proof plate 122, thereby improving the structural stability of the cap assembly 001.

[0073] See also Fig.11 In one embodiment, the supporting portion 114 is a conical ring structure, and the supporting portion 114 has a large diameter end and a small diameter end, and the large diameter end is connected to the main body 113. Along the axial direction of the sealing ring 011, the small diameter end is arranged opposite to the periphery of the orifice plate 014.

[0074] In this embodiment, by configuring the supporting portion 114 as a conical ring structure, the material usage can be reduced and the resistance when the inner wall of the steel shell 002 pushes the supporting portion 114 to move toward the orifice plate 014 can be reduced.

[0075] Exemplarily, the supporting portion 114 includes a first conical segment 1141 and a second conical segment 1142, and the second conical segment 1142 is connected to the main body 113 through the first conical segment 1141. When the groove is machined on the outer wall of the steel shell, the inner wall of the steel shell pushes the supporting portion 114 to move toward the orifice plate 014 until the second conical segment 1142 contacts the orifice plate 014, and the inner circumferential surface of the second conical segment 1142 fits against the side of the orifice plate 014 facing away from the explosion-proof plate 122.

[0076] See also Fig.12 , Fig.12 : is a schematic diagram of the structure of a battery cell provided by an embodiment of the present application. An embodiment of the present application provides a battery cell, which includes a steel shell 002, an electrode assembly 003 and the aforementioned cap assembly 001. The steel shell 002 has an opening 023; the electrode assembly 003 is arranged in the steel shell 002; and the cap assembly 001 blocks the opening 023. Among them, a buckle edge 021 is provided at the end of the steel shell 002 close to the opening 023, and the buckle edge 021 has a flat section 211. The flat section 211 is located on the side of the top cover 121 away from the explosion-proof plate 122, and the flat section 211 is perpendicular to the axis of the explosion-proof plate 122, as shown in FIG. Fig.13 As shown, Fig.13 It is a schematic diagram of the cooperation between the cap assembly 001 and the steel shell 002 provided in the embodiment of the present application.

[0077] It can be understood that the negative electrode sheet of the electrode assembly 003 is electrically connected to the steel shell 002, so that the steel shell 002 is negatively charged. The positive electrode sheet of the electrode assembly 003 is electrically connected to the explosion-proof sheet 122, specifically, it is electrically connected to the explosion-proof sheet 122 through the pole ear, the current collecting plate and the orifice plate 014 in sequence, so that the top cover 121 is positively charged.

[0078] In this embodiment, by adopting the aforementioned cap assembly, the height dimension of the portion of the cap assembly that cooperates with the edge 1223 is reduced, thereby reducing the height dimension of the steel shell that cooperates with the cap assembly 001, so that the reduced dimension of the portion can be increased to the length of the flat section 211 of the buckle edge 021, thereby increasing the electrical connection area between the flat section 211 of the buckle edge 021 and the relevant components, such as Fig.14 As shown, Fig.14 It is a comparison diagram of the increase in length of the buckle edge 021 provided in the embodiment of the present application.

[0079] See also Fig.15 , Fig.15 yes Fig.13 The enlarged view of the center C. In one embodiment, a rolling groove 022 is provided on the outer peripheral surface of the steel shell 002 , and the inner wall of the steel shell 002 located between the rolling groove 022 and the sealing ring 011 abuts against the sealing ring 011 .

[0080] In this embodiment, the inner wall of the steel shell 002 located between the rolling groove 022 and the sealing ring 011 abuts against the sealing ring 011, so that the sealing ring 011 can be squeezed, thereby increasing the pressure on the sealing surface of the sealing ring 011, and then improving the sealing between the steel shell 002 and the cap assembly 001.

[0081] An embodiment of the present application further provides a battery, which includes a plurality of the aforementioned battery cells, and the plurality of battery cells are connected in series or in parallel.

[0082] It can be understood that when multiple battery cells are connected in series, the flat section 211 of the buckle edge 021 of one battery cell among two adjacent battery cells is electrically connected to the top cover 121 of the other battery cell, specifically, they are electrically connected through the series connection.

[0083] The battery disclosed in this embodiment can be used in, but is not limited to, electrical devices such as electric toys, electric tools, ships, aircraft or vehicles. Among them, electric toys can include fixed or mobile electric toys, for example, game consoles, electric car toys, electric ship toys and electric airplane toys, etc., and spacecraft can include airplanes, rockets, space shuttles and spacecrafts, etc. The vehicle can be a fuel car, a gas car or a new energy car, and the new energy car can be a pure electric car, a hybrid car or an extended-range car, etc. The battery can be set at the bottom, head or tail of the vehicle. The battery can be used as a control power source for the vehicle, or as a driving power source for the vehicle.

[0084] The embodiments of the present application are introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core idea of ​​the present application. At the same time, for technical personnel in this field, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A cap assembly, characterized in that: The invention comprises a cover cap, wherein the cover cap comprises a top cover and an explosion-proof plate, wherein the top cover has a first side surface and a second side surface which are arranged opposite to each other, wherein the explosion-proof plate is partially attached to the first side surface, and an edge portion is arranged at the periphery of the explosion-proof plate, wherein the edge portion is arranged at the periphery of the top cover, and the plane where the top surface of the edge portion is located does not exceed the plane where the second side surface is located.

2. The cap assembly according to claim 1, characterized in that: The explosion-proof plate includes a body and a retaining ring arranged on the body, the body portion is attached to the first side surface, the edge portion is the retaining ring, one side of the retaining ring is connected to the body, and the other side of the retaining ring does not exceed the second side surface.

3. The cap assembly according to claim 2, characterized in that: The inner circumferential surface of the retaining ring abuts against the outer circumferential surface of the top cover.

4. The cap assembly according to claim 2, characterized in that: The body and the retaining ring are integrally formed.

5. The cap assembly according to any one of claims 1 to 4, characterized in that: The cap assembly also includes a hole plate and a gasket, wherein the hole plate is located on the side of the explosion-proof disk away from the top cover, the central part of the hole plate is connected to the central part of the explosion-proof disk, the gasket is located at the periphery of the hole plate, and the gasket is arranged between the hole plate and the explosion-proof disk.

6. The cap assembly according to claim 5, characterized in that: The cap assembly also includes a sealing ring, and a sealing groove is arranged on the inner peripheral surface of the sealing ring, and the peripheral edge of the top cover and the peripheral edge of the explosion-proof plate are both inserted into the sealing groove.

7. The cap assembly according to claim 6, characterized in that: The sealing ring includes a main body and a supporting part which are connected in sequence, the sealing groove is arranged on the main body, the supporting part is located on the side of the orifice plate away from the top cover, and is arranged opposite to the periphery of the orifice plate along the axial direction of the sealing ring.

8. The cap assembly according to claim 7, characterized in that: The supporting part is a conical ring structure, and has a large diameter end and a small diameter end, wherein the large diameter end is connected to the main body; along the axial direction of the sealing ring, the small diameter end is arranged opposite to the periphery of the orifice plate.

9. A battery cell, characterized in that: include: Steel shell with openings; An electrode assembly is disposed in the steel shell; The cap assembly according to any one of claims 1 to 8, sealing the opening; Wherein, a buckle edge is arranged at the end of the steel shell close to the opening, and the buckle edge has a flat section, the flat section is located on the side of the top cover away from the explosion-proof plate, and the flat section is perpendicular to the axis of the explosion-proof plate.

10. The battery cell according to claim 9, characterized in that: Rolling grooves are arranged on the outer peripheral surface of the steel shell.

11. A battery, characterized in that: The invention comprises a plurality of battery cells as claimed in claim 9 or 10, wherein the plurality of battery cells are connected in series or in parallel.

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