End cover assembly, end cover, battery cell, battery, and electric device

Abstract

The present application discloses an end cover assembly, an end cover, a battery cell, a battery, and an electric device. The end cover assembly comprises an end cover, electrode terminals and insulating members. Mounting holes are formed in the end cover. The electrode terminals are mounted in the mounting holes. The insulating members are at least partially arranged between the electrode terminals and the end cover, so as to insulate and isolate the electrode terminals from the end cover. The end cover and / or the electrode terminals are provided with first limiting parts; the insulating members are provided with second limiting parts; and the first limiting parts are snap-fitted to the second limiting parts to limit rotation of the insulating members relative to the end cover and / or the electrode terminals. In this way, the risk of rotation of the insulating members relative to the end cover can be reduced, the sealing performance between the insulating members and the end cover is improved, the sealing performance between the insulating members and the electrode terminals is improved, the risk of leakage of an electrolyte is reduced, and the reliability of the battery cell is improved.

Description

End cover assembly, end cover, battery cell, battery and electrical equipment

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application (202322481663.7) filed on September 13, 2023, entitled “End cover assembly, end cover, battery cell, battery and electrical equipment,” the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present application relates to the field of batteries, and in particular to an end cover assembly, an end cover, a battery cell, a battery, and an electrical device. Background Art

[0004] Battery cells have the advantages of small size, high energy density, high power density, many cycles and long storage time. They are widely used in some electronic devices, electric vehicles, electric toys and electric equipment.

[0005] With the continuous development of technology, higher requirements are placed on the performance of battery cells. How to improve the reliability of battery cells has become an urgent problem to be solved.

[0006] Summary of the Invention

[0007] The embodiments of the present application provide an end cover assembly, an end cover, a battery cell, a battery, and an electrical device, which can improve the reliability of the battery cell.

[0008] In a first aspect, an embodiment of the present application provides an end cap assembly, comprising an end cap, an electrode terminal and an insulating member, wherein the end cap is provided with a mounting hole; the electrode terminal is mounted in the mounting hole, the insulating member is at least partially located in the mounting hole, and at least partially disposed between the electrode terminal and the end cap to insulate and isolate the electrode terminal and the end cap; wherein the end cap and / or the electrode terminal are provided with a first limiting portion, and the insulating member is provided with a second limiting portion, and the first limiting portion cooperates with the second limiting portion to limit the rotation of the insulating member relative to the end cap and / or the electrode terminal.

[0009] In the above technical solution, by providing a first limiting portion on the end cover and / or the electrode terminal and providing a second limiting portion on the insulating member, the rotation of the insulating member relative to the end cover and / or the electrode terminal can be limited, thereby improving the sealing between the insulating member and the end cover, improving the sealing between the insulating member and the electrode terminal, reducing the risk of electrolyte leakage, and improving the reliability of the battery cell.

[0010] In some embodiments, at least a portion of one of the first limiting portion and the second limiting portion is a limiting protrusion, and at least a portion of the other portion is a limiting groove.

[0011] In the above technical solution, the first limiting portion and the second limiting portion are matched in the form of a limiting protrusion and a limiting groove, which has a simple structure and is easy to produce.

[0012] In some embodiments, the first limiting portion is a limiting protrusion, and the second limiting portion is a limiting groove.

[0013] In the above technical solution, by providing a limiting protrusion on the end cover and / or the electrode terminal, it can not only limit the rotation of the insulating member, but also help to enhance the structural strength of the end cover and / or the electrode terminal.

[0014] In some embodiments, the first limiting portion is disposed on the end cover.

[0015] In the above technical solution, the first limiting portion on the end cover cooperates with the second limiting portion on the insulating member to limit the rotation of the insulating member.

[0016] In some embodiments, the first limiting portion is disposed on an outer surface of the end cover.

[0017] In the above technical solution, compared with setting the first limiting portion at other positions of the end cover, setting the first limiting portion on the outer surface of the end cover can not only facilitate the processing and forming of the first limiting portion, but also reduce the impact of the first limiting portion on the internal structure of the battery cell.

[0018] In some embodiments, the limiting protrusion includes an annular protrusion arranged around the mounting hole, and the annular protrusion is a non-rotating body.

[0019] In the above technical solution, by setting the annular protrusion as a non-rotating body, the rotation of the insulating member can be more effectively restricted.

[0020] In some embodiments, the annular protrusion is a rectangular ring, a diamond ring, a triangular ring, or an elliptical ring.

[0021] In the above technical solution, the annular protrusion is a rectangular ring, a diamond ring, a triangular ring or an elliptical ring. These shapes are conducive to limiting the rotation of the insulating part and are conducive to controlling the manufacturing accuracy during production.

[0022] In some embodiments, the limiting protrusion includes an annular protrusion arranged around the mounting hole, the annular protrusion is a rotating body, and the central axis of the rotating body is not colinear with the central axis of the mounting hole.

[0023] In the above technical solution, the annular protrusion is a body of revolution, and the central axis of the body of revolution is not collinear with the central axis of the mounting hole. The annular protrusion is offset relative to the mounting hole, which can enhance the limiting effect of the annular protrusion in the circumferential direction of the insulating member. In addition, the body of revolution structure facilitates the control of manufacturing precision during production.

[0024] In some embodiments, a plurality of the annular protrusions are provided, and one of two adjacent annular protrusions is arranged around the outer circumference of the other.

[0025] In the above technical solution, an annular protrusion is provided on the end cover. Providing a plurality of annular protrusions can enhance the restricting effect on the insulating member and further reduce the possibility of the insulating member rotating relative to the end cover.

[0026] In some embodiments, the limiting protrusions include point-shaped protrusions and / or strip-shaped protrusions.

[0027] In the above technical solution, the dot-shaped protrusions use less material, which helps control material costs. The strip-shaped protrusions have a larger contact area with the insulating member, which helps to improve the first limiter's ability to restrict the insulating member's rotation. The arrangement of the dot-shaped and strip-shaped protrusions allows for greater flexibility in the configuration of the first limiter, balancing material costs with the effectiveness of restricting the insulating member's rotation.

[0028] In some embodiments, the strip-shaped protrusions extend along a straight line, a broken line, or a curved line.

[0029] In the above technical solution, the strip-shaped protrusions extend along a straight line, a broken line or a curve, which can limit the rotation of the insulating member relative to the end cover, and the manufacturing method is simple, which can reduce the production difficulty.

[0030] In some embodiments, the limiting protrusion includes a plurality of point-shaped protrusions, and the plurality of point-shaped protrusions are spaced apart around the mounting hole; and / or, the limiting protrusion includes a plurality of strip-shaped protrusions, and the plurality of strip-shaped protrusions are spaced apart around the mounting hole.

[0031] In the above technical solution, a plurality of point-shaped protrusions and / or strip-shaped protrusions are provided, which can enhance the restraining effect of the end cover on the insulating member and further reduce the possibility of the insulating member rotating relative to the end cover.

[0032] In some embodiments, the first limiting portion is disposed on the electrode terminal.

[0033] In the above technical solution, the cooperation between the first limiting portion and the second limiting portion on the insulating member can enhance the connection stability between the insulating member and the electrode terminal, thereby reducing the possibility of the insulating member rotating relative to the end cover.

[0034] In some embodiments, the insulating member is provided with a through hole, the electrode terminal is arranged through the through hole, the first limiting portion is provided on the outer peripheral surface of the electrode terminal, and the second limiting portion is provided on the hole wall of the through hole.

[0035] In the above technical solution, a first limiting portion is provided on the outer peripheral surface of the electrode terminal, and a second limiting portion is provided on the hole wall of the through hole of the insulating member. The cooperation between the first limiting portion and the second limiting portion can reduce the risk of rotation of the insulating member relative to the electrode terminal, improve the sealing between the insulating member and the electrode terminal, improve the sealing between the insulating member and the end cover, reduce the risk of electrolyte leakage, and improve the reliability of the battery cell.

[0036] In some embodiments, a plurality of the second limiting portions are provided, and the plurality of second limiting portions are spaced apart along the circumference of the through hole.

[0037] In the above technical solution, the multiple second limiting portions can further enhance the limiting effect on the insulating member, thereby reducing the risk of the insulating member rotating relative to the end cover.

[0038] In a second aspect, an embodiment of the present application provides an end cover, wherein the end cover is provided with a first limiting portion, and the first limiting portion is used to cooperate with the insulating member and limit the rotation of the insulating member relative to the end cover.

[0039] In a third aspect, an embodiment of the present application provides a battery cell, the battery cell comprising a shell, an end cover assembly provided by any embodiment of the first aspect, or an end cover provided by any embodiment of the second aspect; the shell has an opening, and the end cover covers the opening.

[0040] In a fourth aspect, an embodiment of the present application provides a battery, which includes the battery cell provided by any embodiment of the second aspect.

[0041] In a fifth aspect, an embodiment of the present application provides an electric device, which includes a battery cell provided by any embodiment of the second aspect or a battery provided by an embodiment of the second aspect, and the battery cell or the battery is used to power the electric device. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0043] FIG1 is a schematic structural diagram of a vehicle according to some embodiments of the present application;

[0044] FIG2 is an exploded view of a battery according to some embodiments of the present application;

[0045] FIG3 is an exploded view of a battery cell according to some embodiments of the present application;

[0046] FIG4 is a schematic structural diagram of an end cap assembly according to some embodiments of the present application;

[0047] FIG5 is a schematic structural diagram of an end cap assembly according to some other embodiments of the present application;

[0048] FIG6 is a partial cross-sectional view along CC in FIG5 according to some embodiments of the present application;

[0049] FIG7 is an enlarged view of portion A in FIG6 ;

[0050] FIG8 is a schematic structural diagram of an end cover in some embodiments of the present application;

[0051] FIG9 is a schematic structural diagram of end covers in other embodiments of the present application;

[0052] FIG10 is a schematic structural diagram of the end caps of some other embodiments of the present application;

[0053] FIG11 is a schematic structural diagram of an end cover in some further embodiments of the present application;

[0054] FIG12 is a schematic structural diagram of end covers in yet other embodiments of the present application;

[0055] FIG13 is a schematic structural diagram of a first limiting portion provided on an electrode terminal in some embodiments of the present application.

[0056] Icons: 111-end cover; 1111-mounting hole; 1112-first limiting portion; 1113-liquid injection hole; 112-electrode terminal; 113-insulating member; 1131-second limiting portion; 1132-through hole; 114-pressure relief mechanism; 10-battery cell; 11-end cover assembly; 12-housing; 13-electrode assembly; 100-battery; 20-housing; 21-first part; 22-second part; 23-accommodating space; 1000-vehicle; 200-motor; 300-controller. DETAILED DESCRIPTION

[0057] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0058] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary-secondary relationship.

[0059] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments.

[0060] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0061] The term "and / or" in this application simply describes an association between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0062] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components in different embodiments are omitted. It should be understood that the thickness, length, width, and other dimensions of the various components in the embodiments of this application, as well as the overall thickness, length, width, and other dimensions of the integrated device shown in the drawings are merely illustrative and should not constitute any limitation on this application.

[0063] The term "plurality" used in this application refers to two or more (including two).

[0064] In this application, battery cells may include, but are not limited to, lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries. Battery cells include, but are not limited to, cylindrical, flat, rectangular, or other shapes. Battery cells are generally packaged in cylindrical, prismatic, and soft-pack shapes.

[0065] The battery referred to in the embodiments of this application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in this application may include a battery module or a battery pack. A battery generally includes a casing that encloses one or more battery cells. The casing prevents liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0066] A battery cell includes an electrode assembly and an electrolyte. The electrode assembly consists of a positive electrode sheet, a negative electrode sheet, and a separator. A battery cell primarily operates by the movement of metal ions between the positive and negative electrode sheets. The positive electrode sheet includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive electrode collector. The uncoated positive electrode collector protrudes from the coated positive electrode collector, and the uncoated positive electrode collector serves as the positive electrode tab. For lithium-ion batteries, for example, the positive electrode current collector can be made of aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide. The negative electrode sheet includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative electrode collector. The uncoated negative electrode collector protrudes from the coated negative electrode collector, and the uncoated negative electrode collector serves as the negative electrode tab. The negative electrode current collector can be made of copper, and the negative electrode active material can be carbon or silicon, among others. To ensure that high currents can pass without fusing, multiple positive electrode tabs are stacked together, and multiple negative electrode tabs are stacked together. The separator can be made of materials such as PP (polypropylene) or PE (polyethylene). Furthermore, the electrode assembly can be a wound or laminated structure, but the embodiments of the present application are not limited thereto.

[0067] The development of battery technology must take into account multiple design factors at the same time, such as energy density, cycle life, discharge capacity, charge and discharge rate and other performance parameters. In addition, battery reliability must also be considered.

[0068] A battery cell consists of an end cap assembly, a housing, and an electrode assembly. The end cap assembly typically includes an end cap, electrode terminal, and an insulator. The end cap has mounting holes to allow the electrode terminal to exit the battery cell. A plastic overlay is used to insulate the electrode terminal from the end cap. This overlay is injection molded to provide insulation and secure the electrode terminal to the end cap. The plastic overlay not only insulates but also connects the electrode terminal to the end cap.

[0069] The connection strength between the plastic part and the electrode terminal and the end cover is relatively weak, and the plastic part is more likely to rotate relative to the end cover. The rotation of the plastic part causes the connection strength between the plastic part and the electrode terminal to weaken, and the plastic part rotates relative to the electrode terminal. The rotation of the plastic part relative to the electrode terminal causes the seal between the end cover and the electrode terminal to fail, causing the electrolyte inside the battery cell to leak out of the electrode lead-out hole and flow to the side of the end cover away from the interior of the battery cell, or water vapor outside the battery cell to penetrate into the interior of the battery cell, affecting the reliability of the battery cell.

[0070] In view of this, in order to solve the problem of reduced reliability of the battery cell caused by the rotation of the upper plastic relative to the end cover, an embodiment of the present application provides a technical solution, by providing a first limiting portion on the end cover or the electrode terminal, and providing a second limiting portion on the upper plastic, the first limiting portion cooperates with the second limiting portion to limit the rotation of the insulating part relative to the end cover, thereby improving the reliability of the battery cell.

[0071] The technical solutions described in the embodiments of the present application are applicable to batteries and electrical devices using batteries.

[0072] Electrically powered equipment can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools. Vehicles can be fuel-powered, gas-powered, or new energy vehicles. New energy vehicles can be pure electric vehicles, hybrid vehicles, or extended-range vehicles. Spacecraft include aircraft, rockets, space shuttles, and spacecraft. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers.

[0073] For the convenience of description, the following embodiments are described by taking the electric device as a vehicle as an example.

[0074] Please refer to FIG1 , which is a schematic diagram of the structure of a vehicle 1000 according to some embodiments of the present application. A battery 100 is disposed inside the vehicle 1000 . The battery 100 can be disposed at the bottom, head, or tail of the vehicle 1000 . The battery 100 can be used to power the vehicle 1000 . For example, the battery 100 can serve as an operating power source for the vehicle 1000 .

[0075] The vehicle 1000 may further include a controller 300 and a motor 200 . The controller 300 is used to control the battery 100 to supply power to the motor 200 , for example, to meet the power requirements of the vehicle 1000 during startup, navigation, and driving.

[0076] In some embodiments of the present application, the battery 100 can not only serve as the operating power source of the vehicle 1000, but also serve as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0077] In some embodiments, please refer to FIG2 , which is an exploded view of a battery 100 according to some embodiments of the present application. The battery 100 includes a plurality of battery cells 10. The plurality of battery cells 10 may be connected in series, in parallel, or in a hybrid connection. The term "hybrid connection" refers to a plurality of battery cells 10 connected in both series and parallel.

[0078] In some embodiments, the battery 100 may further include a busbar component (not shown), and the multiple battery cells 10 may be electrically connected via the busbar component to achieve series connection, parallel connection, or mixed connection of the multiple battery cells 10 .

[0079] The busbar component may be a metal conductor, such as copper, iron, aluminum, steel, aluminum alloy, etc.

[0080] In some embodiments, the battery 100 may further include a housing 20 for accommodating the battery cells 10. The housing 20 may include a first portion 21 and a second portion 22, which overlap to define a receiving space 23 for accommodating the battery cells 10. The connection between the first portion 21 and the second portion 22 may be sealed by a sealing element (not shown), such as a sealing ring or sealant.

[0081] The first portion 21 and the second portion 22 can have various shapes, such as a cuboid, a cylinder, etc. The first portion 21 can be a hollow structure with one side open, and the second portion 22 can also be a hollow structure with one side open. The open side of the second portion 22 covers the open side of the first portion 21, thereby forming the box 20 with the accommodating space 23. Of course, the first portion 21 can also be a hollow structure with one side open, and the second portion 22 can be a plate-like structure. The second portion 22 covers the open side of the first portion 21, thereby forming the box 20 with the accommodating space 23.

[0082] Please refer to FIG. 3 , which is an exploded view of a battery cell 10 according to some embodiments of the present application. The battery cell 10 may include a housing 12 , an electrode assembly 13 , an end cover 111 and other functional components.

[0083] The housing 12 is a component for accommodating the electrode assembly 13. The housing 12 can be a hollow structure with an opening at one end, or a hollow structure with openings at both ends. The housing 12 can be made of a variety of materials, such as copper, iron, aluminum, steel, and aluminum alloys. The housing 12 can have a variety of shapes, such as a cylinder or a rectangular parallelepiped. For example, in FIG3 , the housing 12 is a rectangular parallelepiped.

[0084] The end cap 111 is a component that covers the opening of the shell 12 to isolate the internal environment of the battery cell 10 from the external environment. The end cap 111 covers the opening of the shell 12, and the end cap 111 and the shell 12 together define a sealed space for accommodating the electrode assembly 13, electrolyte and other functional components. The shape of the end cap 111 can be adapted to the shape of the shell 12. For example, the shell 12 is a rectangular parallelepiped structure, and the end cap 111 is a rectangular plate structure adapted to the shell 12. For another example, the shell 12 is a cylindrical structure, and the end cap 111 is a circular plate structure adapted to the shell 12. The material of the end cap 111 can also be various. For example, the end cap 111 can be a metal material, such as copper, iron, aluminum, steel, aluminum alloy, etc. The material of the end cap 111 can be the same as or different from the material of the shell 12.

[0085] In the battery cell 10, there can be one or two end caps 111. If the housing 12 is a hollow structure with an opening at one end, one end cap 111 is provided accordingly; if the housing 12 is a hollow structure with openings at both ends, two end caps 111 are provided accordingly, with the two end caps 111 covering the two openings of the housing 12 respectively.

[0086] Referring to Figure 4, Figure 4 is a schematic structural diagram of the end cover assembly 11 of some embodiments of the present application. The end cover assembly 11 includes an end cover 111, an electrode terminal 112 and a pressure relief mechanism 114. The end cover 111 is provided with a liquid injection hole 1113, and the pressure relief mechanism 114 is installed on the end cover 111. The end cover 111 can have two electrode terminals 112 with opposite polarities, which is suitable for the technical solution of the same-side output ear. The end cover 111 can also be installed with only one electrode terminal 112, which is suitable for the technical solution of the single-sided output ear. For the sake of convenience of description, the embodiments of the present application are described by taking the end cover 111 suitable for the double-sided output ear with two electrode terminals 112 installed as an example.

[0087] The pressure relief mechanism 114 is an element or component that activates to release the internal pressure or temperature of the battery cell 10 when the internal pressure or temperature reaches a predetermined threshold. The pressure relief mechanism 114 can take the form of an explosion-proof valve, a bursting disc, a gas valve, a pressure relief valve, or a safety valve, and can specifically employ a pressure-sensitive or temperature-sensitive element or structure. Specifically, when the internal pressure or temperature of the battery cell 10 reaches a predetermined threshold, the pressure relief mechanism 114 activates or a weakened structure within the pressure relief mechanism 114 is destroyed, thereby forming an opening or channel for the internal pressure or temperature to be released.

[0088] The embodiment of the present application provides an end cap assembly 11, which can improve the problem of the upper plastic rotating relative to the end cap 111. The specific structure of the end cap assembly 11 is described in detail below with reference to the accompanying drawings.

[0089] 5 , 6 and 7 , FIG5 is a schematic structural diagram of the end cap assembly 11 of some other embodiments of the present application; FIG6 is a partial cross-sectional view along CC in FIG5 of some embodiments of the present application; FIG7 is an enlarged view of portion A in FIG6 ; FIG8 is a schematic structural diagram of the electrode terminal 112 of some embodiments of the present application providing a first limiting portion 1112 .

[0090] An embodiment of the present application provides an end cap assembly 11, which includes an end cap 111, and the end cap 111 is provided with a mounting hole 1111. At least a portion of the electrode terminal 112 is mounted in the mounting hole 1111. The insulating member 113 is at least partially located in the mounting hole 1111, and at least a portion of the insulating member 113 is disposed between the electrode terminal 112 and the end cap 111 to insulate and isolate the electrode terminal 112 and the end cap 111. The end cap 111 and / or the electrode terminal 112 are provided with a first limiting portion 1112, and the insulating member 113 is provided with a second limiting portion 1131. The first limiting portion 1112 cooperates with the second limiting portion 1131 to limit the rotation of the insulating member 113 relative to the end cap 111 and / or the electrode terminal 112.

[0091] The mounting hole 1111 is a lead-out hole for leading out the power supply terminal 112 set on the end cover 111. The mounting hole 1111 is a through hole. The mounting hole 1111 passes through the inner surface and outer surface of the end cover 111 along the thickness direction of the end cover 111. The inner surface of the end cover 111 is the surface facing the inside of the battery cell 10 when the end cover 111 is in use, and the outer surface of the end cover 111 is the surface facing the outside of the battery cell 10 when the end cover 111 is in use.

[0092] The insulating member 113 can be plastic, at least part of which is located in the mounting hole 1111 , and at least part of which is disposed between the electrode terminal 112 and the end cover 111 to provide insulation and reduce the risk of short circuit between the electrode terminal 112 and the end cover 111 .

[0093] The insulating member 113 is provided with a second stopper 1131, which may be a concave-convex structure intentionally provided on the insulating member 113. Of course, a portion of the insulating member 113 may also serve as the second stopper 1131. For example, a corner of the insulating member 113 may be used as the second stopper 1131, thus eliminating the need for an additional concave-convex structure on the insulating member 113.

[0094] The first limiting portion 1112 is a limiting structure that cooperates with the second limiting portion 1131 to limit the rotation of the insulating member 113 relative to the end cap 111. Limiting the insulating member 113 means preventing the insulating member 113 from rotating or making it difficult for the insulating member 113 to rotate. The first limiting portion 1112 can be provided on the end cap 111 (as shown in FIG. 7 ) or on the electrode terminal 112 (described later). Of course, the first limiting portion 1112 can also be provided on each of the end cap 111 and the electrode terminal 112, that is, both the end cap 111 and the electrode terminal 112 have limiting structures that cooperate with the insulating member 113.

[0095] In this embodiment, by providing a first limiting portion 1112 on the end cover 111 and / or the electrode terminal 112, the first limiting portion 1112 cooperates with the second limiting portion 1131 on the insulating member 113 to reduce the risk of rotation of the insulating member 113 relative to the end cover 111, improve the sealing between the insulating member 113 and the end cover 111, improve the sealing between the insulating member 113 and the electrode terminal 112, reduce the risk of electrolyte leakage, and improve the reliability of the battery cell 10.

[0096] The first limiting portion 1112 and the second limiting portion 1131 may also be in the form of a protrusion and a groove, and the protrusion is snapped into the groove, thereby limiting the rotation of the insulating member 113 relative to the end cover 111.

[0097] In some embodiments, at least a portion of one of the first limiting portion 1112 and the second limiting portion 1131 is a limiting protrusion, and at least a portion of the other is a limiting groove.

[0098] That is, at least a portion of the first limiting portion 1112 may be a limiting protrusion, and at least a portion of the second limiting portion 1131 may be a limiting groove. Alternatively, at least a portion of the first limiting portion 1112 may be a limiting groove, and at least a portion of the second limiting portion 1131 may be a limiting groove.

[0099] In the embodiment where the first position-limiting portion 1112 is at least partially a position-limiting protrusion, the first position-limiting portion 1112 may be entirely or partially a protrusion, and in this case may include other position-limiting structures, such as a concave point. In the embodiment where the second position-limiting portion 1131 is at least partially a position-limiting protrusion, the second position-limiting portion 1131 may be entirely or partially a protrusion, and in this case may include other structures, such as a concave point.

[0100] Similarly, in embodiments where the first limiting portion 1112 is at least partially a limiting groove, the first limiting portion 1112 may be entirely or partially a groove, in which case the first limiting portion 1112 may include other limiting structures, such as bumps. In embodiments where the second limiting portion 1131 is at least partially a limiting groove, the second limiting portion 1131 may be entirely or partially a groove, in which case the second limiting portion 1131 may include other structures, such as bumps.

[0101] The first limiting portion 1112 and the second limiting portion 1131 are matched in the form of a limiting protrusion and a limiting groove, and the protrusion is snapped into the groove, which has a simple structure and is easy to produce.

[0102] It should be understood that the protrusion and the groove cooperate as an example to realize the cooperation between the first limiting portion 1112 and the second limiting portion 1131. The first limiting portion 1112 and the second limiting portion 1131 can also be other cooperation modes. For example, the first limiting portion 1112 and the second limiting portion 1131 can be opposite hook structures, thereby limiting the rotation of the insulating member 113 relative to the end cover 111. For another example, the first limiting portion 1112 and the second limiting portion 1131 can also be strip structures such as rubber strips, one rubber strip is provided on the end cover 111, and the other rubber strip is provided on the insulating member 113. The two rubber strips cooperate with each other to be wrapped and connected, so that the positions of the insulating member 113 and the end cover 111 are relatively fixed, thereby limiting the rotation of the insulating member 113 relative to the end cover 111.

[0103] In some embodiments, the first limiting portion 1112 is a limiting protrusion, and the second limiting portion 1131 is a limiting groove. That is, the end cap 111 and / or the electrode terminal 112 are provided with a limiting protrusion, and the insulating member 113 is provided with a limiting groove.

[0104] Providing a limiting protrusion on the end cover 111 and / or the electrode terminal 112 not only limits the rotation of the insulating member 113 but also helps to enhance the structural strength of the end cover 111 and / or the electrode terminal 112 .

[0105] In some embodiments, the first limiting portion 1112 is disposed on the end cover 111 .

[0106] That is, the end cover 111 cooperates with the second limiting portion 1131 on the insulating member 113 through the first limiting portion 1112 to limit the rotation of the insulating member 113 .

[0107] 6 , in some embodiments, the first limiting portion 1112 is disposed on the outer surface of the end cover 111 .

[0108] Compared with setting the first limiting portion 1112 at other positions of the end cover 111, setting the first limiting portion 1112 on the outer surface of the end cover 111 can not only facilitate the processing and forming of the first limiting portion 1112, but also reduce the impact of the first limiting portion 1112 on the internal structure of the battery cell 10.

[0109] 8 , which is a schematic structural diagram of the end cap 111 according to some embodiments of the present application, in some embodiments, the limiting protrusion is an annular protrusion disposed around the mounting hole 1111 , and the annular protrusion is a non-rotating body.

[0110] The limiting protrusion may be a closed-loop annular protrusion. Of course, a certain gap is also allowed to exist, that is, the limiting protrusion may be an incompletely closed annular protrusion.

[0111] The annular protrusion may include but is not limited to a rectangular ring, a diamond ring, a triangular ring, an elliptical ring, etc. The annular protrusions of these shapes have corners and a symmetrical structure. Symmetry is conducive to controlling manufacturing accuracy during production, and the corners are conducive to limiting the insulating part 113 in the circumferential direction and enhancing the limiting effect of the insulating part 113.

[0112] The annular protrusion being a non-rotating body means that the annular protrusion is a non-circular structure. The inner ring of the annular protrusion may be non-circular, or the outer ring may be non-circular. Of course, both the inner ring and the outer ring of the annular protrusion can be non-circular. The inner ring of the annular protrusion refers to the surface of the annular protrusion facing the electrode terminal 112, and the outer ring of the annular protrusion refers to the surface of the annular protrusion facing away from the electrode terminal 112.

[0113] The limiting protrusion includes an annular protrusion arranged around the mounting hole 1111. The annular protrusion is a non-rotating body. The advantage is that by setting the annular protrusion as a non-rotating body, the rotation of the insulating member 113 can be more effectively limited.

[0114] In some embodiments, the limiting protrusion is an annular protrusion arranged around the mounting hole 1111 , and the annular protrusion is a rotating body, and the central axis of the rotating body is not colinear with the central axis of the mounting hole 1111 .

[0115] The central axis of the rotating body is not collinear with the central axis of the mounting hole 1111 , that is, the rotating body is offset relative to the mounting hole 1111 .

[0116] The annular protrusion may be a closed body of revolution, for example, the body of revolution may be a closed circular ring. Of course, a certain gap is also allowed to exist, that is, the annular protrusion is an incompletely closed body of revolution.

[0117] Since the insulating part 113 is installed in the mounting hole 1111, the rotation center of the insulating part 113 is the center of the mounting hole 1111. If the central axis of the rotating body is collinear with the central axis of the mounting hole 1111, the circumferential limit of the rotating body on the insulating part 113 is weak. Therefore, the annular protrusion is a rotating body and the central axis of the rotating body is not collinear with the central axis of the mounting hole 1111. The annular protrusion is in an offset state relative to the mounting hole 1111, which can enhance the limiting effect on the circumference of the insulating part 113.

[0118] In addition, the annular protrusion is a body of revolution, which is also convenient for production and manufacturing. The body of revolution has a symmetrical structure, which is conducive to controlling the manufacturing accuracy during production.

[0119] In some embodiments, an annular protrusion is provided on the end cover 111 , and a plurality of annular protrusions are provided, wherein one of two adjacent annular protrusions is provided around the periphery of the other.

[0120] Multiple means two or more.

[0121] A plurality of annular protrusions may be arranged to form concentric rings.

[0122] An annular protrusion is provided on the end cover 111 . Providing a plurality of annular protrusions can enhance the restriction effect on the insulating member 113 and further reduce the possibility of the insulating member 113 rotating relative to the end cover 111 .

[0123] Referring to Figures 9, 10, 11 and 12, Figure 9 is a structural schematic diagram of the end cover 111 of some other embodiments of the present application; Figure 10 is a structural schematic diagram of the end cover 111 of some other embodiments of the present application; Figure 11 is a structural schematic diagram of the end cover 111 of some other embodiments of the present application; Figure 12 is a structural schematic diagram of the end cover 111 of some other embodiments of the present application.

[0124] In some embodiments, the limiting protrusions include point-shaped protrusions and / or strip-shaped protrusions.

[0125] As shown in FIG9 , the position-limiting protrusions are dot-shaped protrusions. It should be understood that the dot-shaped protrusions can be round, elliptical, or irregularly shaped. The position-limiting protrusions are dot-shaped protrusions, which use less material and help control material costs.

[0126] As shown in Figures 10 and 11 , the limiting protrusion is a strip-shaped protrusion. Compared with the dot-shaped protrusion, the strip-shaped protrusion has a larger contact area with the insulating member 113, which is beneficial to improving the limiting effect of the first limiting portion 1112 on the rotation of the insulating member 113.

[0127] As shown in Figure 12, the limiting protrusions include dot-shaped protrusions and strip-shaped protrusions. The dot-shaped protrusions and strip-shaped protrusions can be arranged alternately around the mounting hole 1111, or a strip-shaped protrusion can be arranged every two dot-shaped protrusions. Alternatively, a strip-shaped protrusion can be arranged on one side of the mounting hole 1111 and a dot-shaped protrusion on the other side. This arrangement of dot-shaped protrusions and strip-shaped protrusions allows for more flexible configuration of the first limiting portion 1112. This arrangement balances material costs with the effectiveness of limiting the rotation of the insulating member 113.

[0128] 10 and 11 , in some embodiments, the strip-shaped protrusions extend along a straight line, a broken line, or a curved line.

[0129] The strip-shaped protrusions include but are not limited to straight lines (as shown in FIG. 10 ), broken lines, L-shaped curves (as shown in FIG. 11 ), U-shaped curves or S-shaped curves, and the like.

[0130] The strip-shaped protrusions extending along a straight line, a broken line or a curve can limit the rotation of the insulating member 113 relative to the end cover 111 , and the manufacturing method is simple, which can reduce the production difficulty.

[0131] In some embodiments, the limiting protrusion includes a plurality of point-shaped protrusions, which are spaced apart around the mounting hole 1111 ; and / or, the limiting protrusion includes a plurality of strip-shaped protrusions, which are spaced apart around the mounting hole 1111 .

[0132] As shown in Figure 9, two dot-shaped protrusions are provided, and the two dot-shaped protrusions are provided on both sides of the mounting hole 1111. Of course, in other embodiments, the number of the dot-shaped protrusions can also be three, four, etc.

[0133] As shown in Figures 10 and 11, two strip-shaped protrusions are provided, and the two strip-shaped protrusions are provided on both sides of the mounting hole 1111. Of course, in other embodiments, the number of the strip-shaped protrusions can also be three, four, etc.

[0134] As shown in Figure 12, dot-shaped protrusions and strip-shaped protrusions are alternately arranged around the mounting hole 1111. Of course, in other embodiments, a strip-shaped protrusion may be arranged every two dot-shaped protrusions, or multiple strip-shaped protrusions may be arranged on one side of the mounting hole 1111 and multiple dot-shaped protrusions may be arranged on the other side.

[0135] Providing a plurality of point-shaped protrusions and / or strip-shaped protrusions can enhance the restraining effect of the end cover 111 on the insulating member 113 and further reduce the possibility of the insulating member 113 rotating relative to the end cover 111 .

[0136] Referring to Figure 13, Figure 13 illustrates a schematic diagram of a structure in which a first stopper 1112 is provided on electrode terminal 112 in some embodiments of the present application. In some embodiments, first stopper 1112 is provided on electrode terminal 112. First stopper 1112 cooperates with second stopper 1131 on insulating member 113 to reduce the possibility of insulating member 113 rotating relative to end cap 111.

[0137] 13 , in some embodiments, the insulating member 113 is provided with a through hole 1132 , the electrode terminal 112 is provided through the through hole 1132 , the first limiting portion 1112 is provided on the outer peripheral surface of the electrode terminal 112 , and the second limiting portion 1131 is provided on the hole wall of the through hole 1132 .

[0138] As shown in Figure 13 , the first limiting portion 1112 is a limiting protrusion provided on the outer circumference of the electrode terminal 112, and the second limiting portion 1131 is a limiting groove provided on the hole wall of the insulating member 113. Of course, in other embodiments, the limiting groove may be provided on the outer circumference of the electrode terminal 112, and the limiting protrusion may be provided on the hole wall of the insulating member 113.

[0139] By setting a first limiting portion 1112 on the outer peripheral surface of the electrode terminal 112 and setting a second limiting portion 1131 on the hole wall of the through hole 1132 of the insulating member 113, the first limiting portion 1112 and the second limiting portion 1131 cooperate with each other to reduce the risk of the insulating member 113 rotating relative to the electrode terminal 112, improve the sealing between the electrode terminal 112 and the insulating member 113, improve the sealing between the end cover 111 and the insulating member 113, reduce the risk of electrolyte leakage, and improve the reliability of the battery cell 10.

[0140] In some embodiments, a plurality of second limiting portions 1131 are provided, and the plurality of second limiting portions 1131 are spaced apart along the circumference of the through hole 1132. The plurality of second limiting portions 1131 can further enhance the limiting effect on the insulating member 113, thereby reducing the risk of the insulating member 113 rotating relative to the end cap 111.

[0141] The embodiment of the present application further provides an end cover 111 , which is provided with a first limiting portion 1112 . The first limiting portion 1112 is used to cooperate with the insulating member 113 and limit the insulating member 113 from rotating relative to the end cover 111 .

[0142] The embodiment of the present application further provides a battery cell 10, which includes a shell 12, an end cover assembly 11 provided in any of the above embodiments, or an end cover 111 provided in any of the above embodiments; the shell 12 has an opening, and the end cover 111 covers the opening.

[0143] An embodiment of the present application further provides a battery 100 , which includes the battery cell 10 provided in any of the above embodiments.

[0144] An embodiment of the present application also provides an electrical device, which includes the battery cell 10 provided in any of the above embodiments or the battery 100 provided in the second embodiment, and the battery cell 10 or the battery 100 is used to power the electrical device.

[0145] The embodiment of the present application also provides an end cap assembly 11, which includes an end cap 111, an insulating member 113, and an electrode terminal 112. The end cap 111 is provided with a mounting hole 1111, which penetrates the end cap 111 along the thickness direction of the end cap 111. The insulating member 113 is provided with a through hole 1132, and the electrode terminal 112 is installed in the through hole 1132. The insulating member 113 is installed in the mounting hole 1111 to insulate and isolate the electrode terminal 112 from the end cap 111. The outer surface of the end cap 111 is provided with a limiting protrusion, and the outer periphery of the insulating member 113 is provided with a limiting groove. The limiting protrusion and the limiting groove cooperate to limit the rotation of the insulating member 113 relative to the end cap 111.

[0146] It should be noted that, unless there is any conflict, the embodiments and features in the embodiments of this application can be combined with each other.

[0147] The above embodiments are intended only to illustrate the technical solutions of this application and are not intended to limit this application. Those skilled in the art will appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this application are intended to be within the scope of protection of this application.

Claims

1. An end cap assembly, comprising: An end cover having a mounting hole; An electrode terminal installed in the installation hole; an insulating member, at least part of which is located in the mounting hole, and at least part of which is disposed between the electrode terminal and the end cover to insulate and isolate the electrode terminal from the end cover; Wherein, the end cap and / or the electrode terminal is provided with a first limiting portion, and the insulating member is provided with a second limiting portion, and the first limiting portion cooperates with the second limiting portion to limit the insulating member from rotating relative to the end cap and / or the electrode terminal.

2. The end cap assembly according to claim 1, wherein: At least a portion of one of the first limiting portion and the second limiting portion is a limiting protrusion, and at least a portion of the other portion is a limiting groove.

3. The end cap assembly according to claim 2, wherein: The first limiting portion is a limiting protrusion, and the second limiting portion is a limiting groove.

4. The end cap assembly according to claim 2, wherein: The first limiting portion is arranged on the end cover.

5. The end cap assembly according to claim 4, wherein: The first limiting portion is arranged on the outer surface of the end cover.

6. The end cap assembly according to claim 4 or 5, wherein: The limiting protrusion comprises an annular protrusion arranged around the mounting hole, and the annular protrusion is a non-rotating body.

7. The end cap assembly according to claim 6, wherein: The annular protrusion is a rectangular ring, a diamond ring, a triangle ring or an elliptical ring.

8. The end cap assembly according to claim 4 or 5, wherein: The limiting protrusion includes an annular protrusion arranged around the mounting hole, the annular protrusion is a rotating body, and the central axis of the rotating body is not colinear with the central axis of the mounting hole.

9. The end cap assembly according to any one of claims 6 to 8, wherein: A plurality of the annular protrusions are provided, and one of two adjacent annular protrusions is arranged around the outer periphery of the other one.

10. The end cap assembly according to any one of claims 4 to 9, wherein: The limiting protrusions include point-shaped protrusions and / or strip-shaped protrusions.

11. The end cap assembly according to claim 10, wherein: The strip-shaped protrusions extend along a straight line, a folded line or a curved line.

12. The end cap assembly according to claim 10, wherein: The limiting protrusion includes a plurality of dot-shaped protrusions, and the plurality of dot-shaped protrusions are arranged at intervals around the mounting hole; and / or the limiting protrusion includes a plurality of strip-shaped protrusions, and the plurality of strip-shaped protrusions are arranged at intervals around the mounting hole.

13. The end cap assembly according to any one of claims 1 to 12, wherein: The first limiting portion is disposed on the electrode terminal.

14. The end cap assembly of claim 13, wherein: The insulating member is provided with a through hole, the electrode terminal is arranged through the through hole, the first limiting portion is arranged on the outer peripheral surface of the electrode terminal, and the second limiting portion is arranged on the hole wall of the through hole.

15. The end cap assembly of claim 14, wherein: A plurality of the second limiting portions are provided, and the plurality of the second limiting portions are arranged at intervals along the circumferential direction of the through hole.

16. An end cover, the end cover being provided with a first limiting portion, the first limiting portion being used to cooperate with an insulating member and limit the insulating member from rotating relative to the end cover.

17. A battery cell, comprising: The end cap assembly according to any one of claims 1 to 15 or the end cap according to claim 16; The shell has an opening, and the end cover covers the opening.

18. A battery comprising the battery cell according to claim 17.

19. An electrical device, comprising the battery cell according to claim 17 or the battery according to claim 18, wherein the battery cell or the battery is used to supply power to the electrical device.

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