CN221057543U

CN221057543U - End cover, battery monomer, battery and power utilization device

Info

Publication number: CN221057543U
Application number: CN202420481422.4U
Authority: CN
Inventors: 白花蕾; 郑于炼; 郑挺; 黄守君; 王鹏; 彭欣滢
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2024-03-13
Filing date: 2024-03-13
Publication date: 2024-05-31
Anticipated expiration: 2034-03-13

Abstract

The application relates to an end cover, a battery cell, a battery and an electric device. The end cap comprises a cap body; and an insulating protrusion having a main body portion and an extension portion; the main body part is arranged on the inner side of the cover body in a protruding way, and the extension part extends from the peripheral side of the main body part and is arranged on the same side of the cover body in a protruding way with the main body part; in the thickness direction of the cover body, at least part of the surface of the extension part facing away from the cover body is concave towards the cover body compared with the surface of the same side in the main body part. Therefore, at least part of the surface of the extension part, which is opposite to the cover body, is farther away from the electrode assembly below than the main body part, and a certain interval space is formed between the extension part and the electrode assembly, and the interval space can reduce the contact between the electrode assembly and the extension part when the battery monomer is subjected to working conditions such as vibration, impact and the like, so that the condition of reducing the end part of the electrode assembly from being crushed is realized, and the reliability of the electrode assembly is improved.

Description

End cover, battery monomer, battery and power utilization device

Technical Field

The application relates to the technical field of batteries, in particular to an end cover, a battery cell, a battery and an electric device.

Background

The statements herein merely provide background information related to the present disclosure and may not necessarily constitute prior art.

In the battery production manufacturing process, the periphery of the electrode assembly is required to be wrapped with an insulating sheet before the electrode assembly is put into the shell, insulation between the electrode assembly and the shell is guaranteed, and in order to position and fix the insulating sheet, the insulating sheet is usually connected with a convex hull of lower plastic of the end cover through hot melting.

In the related art, in order to secure the reliability of the hot melt, the convex hull needs to have a certain extension length to increase the hot melt area, but the extension portion has a case of crushing the end of the electrode assembly when the battery is subjected to vibration, impact, or the like.

Disclosure of utility model

In view of the problems, the application provides an end cover, a battery cell, a battery and an electric device, which can relieve the problem that the end part of an electrode assembly is damaged by the extension part of a convex hull.

In a first aspect, the present application provides an end cap comprising a cap body; has a main body portion and an extension portion; the main body part is arranged on the inner side of the cover body in a protruding way, and the extension part extends from the peripheral side of the main body part and is arranged on the same side of the cover body in a protruding way with the main body part; in the thickness direction of the cover body, at least part of the surface of the extension part facing away from the cover body is concave towards the cover body compared with the surface of the same side in the main body part.

Through setting up in the thickness direction of lid body, the extension is facing away from the surface of the same side in the lid body's at least part surface compare main part, towards the lid body indent, can make the extension be farther away from the electrode assembly of below than main part on the at least part surface compare main part of lid body, and form certain interval space between with the electrode assembly, this interval space can reduce the contact between electrode assembly and the extension when the battery monomer takes place operating mode such as vibration, impact, and then realize reducing the condition of crushing electrode assembly tip, promote electrode assembly's reliability. In addition, the surface of the same side of the main body part protrudes as compared with the concave surface of the extension part, so that the electrode assembly can be fixed.

In some embodiments, the extension includes a first extension and a second extension, the first extension being disposed closer to the main body than the second extension, the first extension having a width greater than a width of the second extension in a width direction of the cap body;

At least part of the surface of the second extension part facing away from the cover body is concave towards the cover body compared with the surface of the same side in the main body part and the first extension part in the thickness direction of the cover body.

Because the first extension portion is closer to the main body portion than the second extension portion, and the width of the first extension portion is larger than that of the second extension portion, the second extension portion is only arranged to be concave towards the cover body, on one hand, the narrower portion of the extension portion can be farther away from the electrode assembly below than the main body portion, and contact between the electrode assembly and the extension portion is reduced, so that the condition of reducing the end portion of the electrode assembly from being crushed is realized, and on the other hand, the wider portion of the extension portion and the main body portion are propped against the end face of the electrode assembly together, so that the electrode assembly is fixed more reliably.

In some embodiments, in the thickness direction of the cover body, a surface of the second extension portion facing away from the cover body is recessed as a whole compared with a surface of the same side of the main body portion and the first extension portion.

The surface of one side of the second extension part, which is opposite to the cover body, is concave compared with the surface of the same side in the main body part and the first extension part, so that the electrode assembly is farther away from the lower part than the main body part on the whole, and the contact between the electrode assembly and the extension part is further reduced when the battery unit is subjected to working conditions such as vibration, impact and the like.

In some embodiments, at least a portion of the surface of the extension facing away from the cap body is recessed toward the cap body in the thickness direction of the cap body.

By forming the grooves, the portion of the extension portion that is recessed can be made more distant from the electrode assembly below, further reducing the risk of contact between the electrode assembly and the extension portion.

In some embodiments, in the thickness direction of the cover body, a chamfer or rounded angle is formed between at least a part of the surface of the extension portion facing away from the cover body and an end surface of the extension portion facing away from the main body portion.

Since the extension is formed with a chamfer or rounded corner at the end remote from the main body portion, at least a portion of the surface of the extension facing away from the cap body can be remote from the electrode assembly below, further reducing the risk of contact between the electrode assembly and the extension. In addition, the end of the extension portion away from the main body portion is also relatively sharp, and therefore, providing a chamfer or rounded corner can also reduce damage to the electrode assembly from the sharp point.

In some embodiments, in the thickness direction of the cover body, the depth of the lowest point of the concave part of the extension part is H, and the thickness of the main body part protruding out of the cover body is H;

wherein H-2 mm is more than or equal to H is more than or equal to 1 mm.

When h is not less than 1mm, a minimum reliable distance can be maintained between the recessed portion of the extension and the electrode assembly. In addition, as described above, the extension portion can be connected to the insulating member, and therefore, when H-2 mm. Gtoreq.h, the extension portion can be made to have a sufficient area to provide a hot-melt connection position for the insulating member, improving the connection reliability of the insulating protrusion and the insulating member.

In some embodiments, the extension has a width T.ltoreq.3 millimeters.

When T is less than or equal to 3 mm, the extension part is of a thin rib structure, and if the extension part does not sink towards the cover body in the thickness direction of the cover body, the end part of the electrode assembly is more easily crushed when the battery monomer is subjected to working conditions such as vibration, impact and the like. Therefore, by arranging the electrode assembly in the thickness direction of the cover body in such a manner that T is less than or equal to 3 mm, at least part of the surface of the extension part facing away from the cover body is recessed toward the cover body compared with the surface on the same side in the main body part, the situation that the end part of the electrode assembly is crushed can be reduced, and the reliability of the electrode assembly is improved.

In addition, when T of the extension portion is 3mm or less, the electrode terminal or the adapter connected to the electrode terminal may be omitted due to the small width.

In some embodiments, the cover body is provided with electrode terminals, the main body part and the electrode terminals are arranged at intervals in the length direction of the cover body, the extending part extends from the main body part towards the electrode terminals, and a gap is formed between the electrode terminals and the end surfaces of the extending part, wherein the gap is not more than 2 mm; or alternatively

The extending parts and the electrode terminals are arranged at intervals in the width direction of the cover body, and the projection of the extending parts towards the electrode terminals and the electrode terminals have an overlapping area.

By setting the gap not larger than 2 mm, the extension part can reliably avoid the electrode terminal, and the length of the extension part is as long as possible, so that the connection requirement with the insulating part is met. In addition, by arranging the extending parts and the electrode terminals at intervals in the width direction of the cover body, and the projection of the extending parts towards the electrode terminals has an overlapping area with the electrode terminals, the extending parts can extend to exceed the electrode terminals and no position interference is generated between the extending parts and the electrode terminals, so that the extending parts can have long lengths, and enough area is provided for the insulation parts to be connected.

In a second aspect, a battery cell is provided that includes an end cap of any of the embodiments described above.

In some embodiments, the battery cell further comprises a casing, an electrode assembly and an insulating member, wherein the casing is provided with an opening, the end cover is covered at the opening, the electrode assembly is arranged in the casing, and the insulating member is positioned in the casing and is coated on the periphery of the electrode assembly;

wherein at least a portion of the insulator is connected to the extension.

Because at least part of the insulating piece is connected with the extending part of the insulating convex part, and in the thickness direction of the cover body, at least part of the surface of the extending part, which is opposite to the cover body, is concave towards the cover body compared with the surface of the same side in the main body part, the connecting area of the insulating piece and the insulating convex part can be increased, the condition of crushing the end part of the electrode assembly can be reduced, and the reliability of the electrode assembly can be improved.

In a third aspect, a battery is provided, including a battery cell according to any of the embodiments described above.

In a fourth aspect, an electrical device is provided, comprising a battery according to any of the embodiments described above.

The foregoing description is only an overview of the present application, and is intended to be implemented in accordance with the teachings of the present application in order that the same may be more clearly understood and to make the same and other objects, features and advantages of the present application more readily apparent.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. Also, like reference numerals are used to designate like parts throughout the accompanying drawings. In the drawings:

FIG. 1 is a schematic structural view of a vehicle according to one or more embodiments.

Fig. 2 is an exploded view of a battery according to one or more embodiments.

Fig. 3 is an exploded view of a battery cell according to one or more embodiments.

FIG. 4 is a schematic structural view of an end cap according to one or more embodiments.

Fig. 5 is an elevation view of the end cap shown in fig. 4.

Fig. 6 is a bottom view of the end cap shown in fig. 4.

Fig. 7 is a schematic structural view of an end cap according to another one or more embodiments.

Fig. 8 is an elevation view of the end cap shown in fig. 7.

Fig. 9 is a schematic structural view of an end cap according to yet another embodiment or embodiments.

Fig. 10 is an elevation view of the end cap shown in fig. 9.

Fig. 11 is a schematic view of the internal structure of the battery cell shown in fig. 3.

Fig. 12 is a partial schematic structural view of the internal structure of the battery cell shown in fig. 3.

Reference numerals in the specific embodiments are as follows:

Vehicle 1000, battery 100, case 10, first portion 11, second portion 12, battery cell 20, end cap 21, electrode terminal 211, cap body 212, insulation protrusion 213, main body 2131, extension 2132, recess 2132c, case 22, electrode assembly 23, adapter 24, insulator 25, battery module 30, controller 200, motor 300.

Detailed Description

Embodiments of the technical scheme of the present application will be described in detail below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present application, and thus are merely examples, and are not intended to limit the scope of the present application.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having" and any variations thereof in the description of the application and the claims and the description of the drawings above are intended to cover a non-exclusive inclusion.

In the description of embodiments of the present application, the technical terms "first," "second," and the like are used merely to distinguish between different objects and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, a particular order or a primary or secondary relationship. In the description of the embodiments of the present application, the meaning of "plurality" is two or more unless explicitly defined otherwise.

Reference herein to "an embodiment" means 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 appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.

In the description of the embodiments of the present application, the term "and/or" is merely an association relationship describing an association object, and indicates that three relationships may exist, for example, 1 and/or 2 may indicate: there are three cases where 1 alone exists, 1 and 2 exist at the same time, and 2 exist alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.

In the description of the embodiments of the present application, the term "plurality" means two or more (including two), and similarly, "plural sets" means two or more (including two), and "plural sheets" means two or more (including two).

In the description of the embodiments of the present application, the orientation or positional relationship indicated by the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and simplification of the description, and do not indicate or imply that the apparatus or element referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the embodiments of the present application.

In the description of the embodiments of the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured" and the like should be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally formed; or may be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the embodiments of the present application will be understood by those of ordinary skill in the art according to specific circumstances.

In the assembly process of the battery cell, the electrode assembly and the shell are required to be isolated in the battery cell, so that the short circuit inside the battery cell caused by the contact of the electrode assembly and the shell is avoided. The insulating mode that uses the lower plastic insulation isolation electrode subassembly and the end cover of end cover, uses insulating piece cladding electrode subassembly, is connected insulating piece and lower plastic hot melt to fixed insulating piece's position, put into the inside of casing with the electrode subassembly that the cladding has insulating piece again, the insulating piece sets up between the inner wall of electrode subassembly and casing, realizes insulation isolation electrode subassembly and casing, guarantees the free security performance of battery.

However, in the related art, the bottom of the lower plastic is generally provided with a convex hull, the side surface of the convex hull can be connected with the insulating sheet, and the bottom of the convex hull is generally abutted against the end surface of the electrode assembly to fix the electrode assembly. In order to ensure the connection reliability of the lower plastic and the insulating sheet, a sufficient connection area needs to be reserved on the side surface of the lower plastic, which often leads to a certain extension length of the side surface of the convex hull, for example, in the length direction of the end cover, one end of the convex hull is extended, but because the extending direction of the convex hull has position interference with the electrode terminal or the adapter, the extending part of the convex hull is designed to be narrower, which leads to the situation that the extending part is pressed to damage the end part of the electrode assembly when the battery is subjected to vibration, impact and other working conditions in the battery production process.

In order to alleviate the problem that the convex hull extension of the lower plastic in the related art damages the end of the electrode assembly, an end cover is designed in the embodiment of the application, and the end cover comprises a cover body and an insulation convex part. The insulation convex part is provided with a main body part and an extension part, the main body part protrudes to the inner side of the cover body, and the extension part extends from the peripheral side of the main body part and protrudes to the same side of the cover body as the main body part; in the thickness direction of the cover body, at least part of the surface of the extension part facing away from the cover body is concave towards the cover body compared with the surface of the same side in the main body part.

In this way, through setting up in the thickness direction of lid body, the extension is facing away from the surface of the same side in the lid body in the at least partial surface of lid body compare, towards the lid body indent, can make the extension be facing away from the electrode assembly of below in the at least partial surface of lid body compare, and form certain interval space between with the electrode assembly, this interval space can reduce the contact between electrode assembly and the extension when the battery takes place operating mode such as vibration, impact, and then realize reducing the condition of crushing electrode assembly tip, promote electrode assembly's reliability. In addition, the surface of the same side of the main body part protrudes as compared with the concave surface of the extension part, so that the electrode assembly can be fixed.

The end cover is applied to a battery to relieve the problem that the convex hull extension part of the lower plastic rubber is pressed against the end part of the electrode assembly.

The electricity disclosed by the embodiment of the application can be used in electricity utilization devices such as vehicles, ships or aircrafts, but is not limited to the electricity utilization devices.

The embodiment of the application provides an electric device using a battery as a power supply, wherein the electric device can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft and the like. Among them, the electric toy may include fixed or mobile electric toys, such as game machines, electric car toys, electric ship toys, electric plane toys, and the like, and the spacecraft may include planes, rockets, space planes, and spacecraft, and the like.

For convenience of description, the following embodiment will take an electric device according to an embodiment of the present application as an example of the vehicle 1000.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a vehicle 1000 according to some embodiments of the application. The vehicle 1000 may be a fuel oil vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or a range-extended vehicle. The battery 100 is provided in the interior of the vehicle 1000, and the battery 100 may be provided at the bottom or the head or the tail of the vehicle 1000. The battery 100 may be used for power supply of the vehicle 1000, for example, the battery 100 may be used as an operating power source of the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, the controller 200 being configured to control the battery 100 to power the motor 300, for example, for operating power requirements during start-up, navigation, and travel of the vehicle 1000.

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

Referring to fig. 2, fig. 2 is an exploded view of a battery 100 according to some embodiments of the present application. The battery 100 includes a case 10 and a battery cell 20, and the battery cell 20 is accommodated in the case 10. The case 10 is used to provide an accommodating space for the battery cell 20, and the case 10 may have various structures. In some embodiments, the case 10 may include a first portion 11 and a second portion 12, the first portion 11 and the second portion 12 being overlapped with each other, the first portion 11 and the second portion 12 together defining an accommodating space for accommodating the battery cell 20. The second portion 12 may be a hollow structure with one end opened, the first portion 11 may be a plate-shaped structure, and the first portion 11 covers the opening side of the second portion 12, so that the first portion 11 and the second portion 12 together define a containing space; the first portion 11 and the second portion 12 may be hollow structures each having an opening at one side, and the opening side of the first portion 11 is engaged with the opening side of the second portion 12. Of course, the case 10 formed by the first portion 11 and the second portion 12 may be of various shapes, such as a cylinder, a rectangular parallelepiped, or the like.

In the battery 100, the plurality of battery cells 20 may be connected in series, parallel or a series-parallel connection, wherein the series-parallel connection refers to that the plurality of battery cells 20 are connected in series or parallel. The plurality of battery cells 20 can be directly connected in series or in parallel or in series-parallel, and then the whole formed by the plurality of battery cells 20 is accommodated in the box 10; of course, the battery 100 may also be a form that a plurality of battery cells 20 are connected in series or parallel or in series-parallel to form a battery module 30, and a plurality of battery modules 30 are connected in series or parallel or in series-parallel to form a whole and are accommodated in the case 10. The battery 100 may further include other structures, for example, the battery 100 may further include a bus member for making electrical connection between the plurality of battery cells 20.

Wherein each battery cell 20 may be a secondary battery or a primary battery; but not limited to, lithium sulfur batteries, sodium ion batteries, or magnesium ion batteries. The battery cell 20 may be in the shape of a cylinder, a flat body, a rectangular parallelepiped, or other shapes, etc.

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

The end cap 21 refers to a member that is covered at the opening of the case 22 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the end cap 21 may be adapted to the shape of the housing 22 to fit the housing 22. Optionally, the end cover 21 may be made of a material (such as an aluminum alloy) with a certain hardness and strength, so that the end cover 21 is not easy to deform when being extruded and collided, so that the battery cell 20 can have higher structural strength, and the safety performance can be improved. The end cap 21 may be provided with a functional part such as an electrode terminal 211. The electrode terminals 211 may be used to be electrically connected with the electrode assembly 23 for outputting or inputting electric power of the battery cell 20. Specifically, the electrode terminal 211 may be electrically connected with the electrode assembly 23 through the adapter 24, and the adapter 24 may be a tab. For example, in some embodiments, the end cap 21 may also be provided with a pressure relief mechanism for relieving the internal pressure of the battery cell 20 when the internal pressure or temperature reaches a threshold. The material of the end cap 21 may be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not particularly limited in the embodiment of the present application. In some embodiments, an insulator 25 may also be provided on the inside of the end cap 21, the insulator 25 may be used to isolate electrical connection components within the housing 22 from the end cap 21 to reduce the risk of short circuits. For example, the insulating member 25 may be an insulating sheet or an insulating film, and the insulating member may be made of plastic, rubber, or the like.

The case 22 is an assembly for cooperating with the end cap 21 to form an internal environment of the battery cell 20, wherein the formed internal environment may be used to accommodate the electrode assembly 23, the electrolyte, and other components. The case 22 and the end cap 21 may be separate members, and an opening may be provided in the case 22, and the interior of the battery cell 20 may be formed by covering the opening with the end cap 21 at the opening. It is also possible to integrate the end cap 21 and the housing 22, but specifically, the end cap 21 and the housing 22 may form a common connection surface before other components are put into the housing, and when it is necessary to encapsulate the inside of the housing 22, the end cap 21 is then put into place with the housing 22. The housing 22 may be of various shapes and sizes, such as rectangular parallelepiped, cylindrical, hexagonal prism, etc. Specifically, the shape of the case 22 may be determined according to the specific shape and size of the electrode assembly 23. The material of the housing 22 may be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not particularly limited in the embodiment of the present application.

The electrode assembly 23 is a component in which electrochemical reactions occur in the battery cell 20. One or more electrode assemblies 23 may be contained within the housing 22. The electrode assembly 23 is mainly composed of positive and negative electrode materials, a separator, and a current collector. Specifically, the positive electrode material is coated on the battery output electrode connecting piece to form a positive electrode piece, the negative electrode material is coated on the battery output electrode connecting piece to form a negative electrode piece, the positive electrode piece and the negative electrode piece are wound or stacked, and the diaphragm is arranged between the positive electrode piece and the negative electrode piece to form the electrode assembly 23. The portions of the positive electrode sheet and the negative electrode sheet having the active material constitute the main body portion of the electrode assembly, and the portions of the positive electrode sheet and the negative electrode sheet having no active material constitute the tabs, respectively. The positive electrode tab and the negative electrode tab may be located at one end of the main body portion together or located at two ends of the main body portion respectively. During charge and discharge of the battery, the positive electrode active material and the negative electrode active material react with the electrolyte, and the tab is connected with the electrode terminal to form a current loop.

FIG. 4 is a schematic structural view of an end cap according to one or more embodiments. Referring to the drawings, an embodiment of the present application provides an end cap 21 including a cap body 212 and an insulation protrusion 213. The insulating protruding portion 213 has a main body portion 2131 and an extension portion 2132, the main body portion 2131 protruding inward of the lid body 212, and the extension portion 2132 extends from the peripheral side of the main body portion 2131 and protrudes from the same side of the lid body 212 as the main body portion 2131. At least a portion of the surface of the extension portion 2132 facing away from the cover body 212 is recessed toward the cover body 212 in the thickness direction of the cover body 212 compared with the surface of the same side of the main body portion 2131.

The cap body 212 is a main structure of the cap 21, and mainly serves to cover the opening of the case 22 to isolate the internal environment of the battery cell 20 from the external environment. The shape of the cover body 212 is adapted to the shape of the opening of the housing 22. For example, when the opening of the case 22 is rectangular, the cover body 212 is also rectangular in shape. When the opening of the housing 22 is circular, the cover body 212 is also circular in shape.

The insulating protrusions 213 are components that can isolate the electrical connector within the housing 22 from the cap body 212 to reduce the risk of leakage. Specifically, the insulating protrusion 213 may be a lower plastic member, such as plastic or rubber.

The inside of the cover body 212 refers to the side of the cover body 212 facing the inside of the housing 22.

The main body portion 2131 of the insulating protruding portion 213 is a portion that mainly plays a role in insulating and isolating, and the extension portion 2132 is a portion that extends out of the main body portion 2131. The peripheral side of the main body 2131 is an outer peripheral surface of the main body 2131, and the extension portion 2132 may have one end connected to the peripheral side of the main body 2131 and one end extending in a direction away from the peripheral side. In the embodiment of the present application, the cover body 212 has a rectangular shape, and the extension portion 2132 may extend in the longitudinal direction of the cover body 212, that is, in the X direction shown in fig. 4. In other embodiments, when the cover body 212 is circular, the extension 2132 may extend in a circumferential direction of the cover body 212.

The thickness direction of the cap body 212 refers to the Z direction as shown in fig. 4, that is, the height direction of the battery cell 20.

At least a portion of the surface of the extension portion 2132 facing away from the cover body 212 refers to a bottom surface of the extension portion 2132 shown in fig. 5, and since the surface is concave toward the cover body 212 compared to the surface on the same side of the main portion 2131, the surface is relatively closer to the cover body 212 in the thickness direction of the cover body 212. In the embodiment of the present application, the extension 2132 may be concave, but the concave form is not limited to a concave formed by combining a plurality of surfaces, and may be a single curved surface or a single plane.

Through setting up in the thickness direction of lid body 212, the at least partial surface of extension 2132 back to lid body 212 compares the surface of the same side in main part 2131, towards lid body 212 indent, can make the at least partial surface of extension 2132 back to lid body 212 more keep away from electrode assembly 23 of below than main part 2131, and form certain interval space with electrode assembly 23 between, this interval space can reduce electrode assembly 23 and extension 2132 when battery cell 20 takes place operating mode such as vibration, impact, and then realize reducing the condition of pressing the electrode assembly 23 tip, promote electrode assembly 23's reliability. In addition, since the surface of the same side of the main body portion 2131 is protruded as compared to the concave surface of the extension portion 2132, the electrode assembly 23 can be still fixed.

According to some embodiments of the application, the extension portion 2132 includes a first extension portion 2132a and a second extension portion 2132b, the first extension portion 2132a being disposed closer to the main body portion 2131 than the second extension portion 2132b, the width of the first extension portion 2132a being greater than the width of the second extension portion 2132b in the width direction of the lid body 212. In the thickness direction of the cover body 212, at least a portion of the surface of the second extension portion 2132b facing away from the cover body 212 is concave toward the cover body 212 compared with the surface of the same side of the main portion 2131 and the first extension portion 2132 a.

The width direction of the cap body 212 refers to the Z direction as shown in fig. 4, that is, the width direction of the battery cell 20.

Since the first extension portion 2132a is provided closer to the main body portion 2131 than the second extension portion 2132b, and the width of the first extension portion 2132a is larger than the width of the second extension portion 2132b, by providing only the second extension portion 2132b to be recessed toward the cover body 212, on the one hand, the narrower portion of the extension portion 2132 can be further away from the electrode assembly 23 below than the main body portion 2131, and the contact between the electrode assembly 23 and the extension portion 2132 can be reduced, thereby reducing the occurrence of crushing the end of the electrode assembly 23, and on the other hand, the wider portion of the extension portion 2132 can be made to abut against the end face of the electrode assembly 23 together with the main body portion 2131, so that the electrode assembly 23 can be fixed more reliably.

Referring to fig. 5, according to some embodiments of the present application, in the thickness direction of the cover body 212, a surface of a side of the second extension portion 2132b facing away from the cover body 212 is recessed as a whole compared to a surface of the same side of the main portion 2131 and the first extension portion 2132 a.

Since the surface of the second extension portion 2132b facing away from the cover body 212 is concave as a whole compared with the surface of the same side of the main body portion 2131 and the first extension portion 2132a, the electrode assembly 23 can be further away from the lower side than the main body portion 2131 as a whole, and the contact between the electrode assembly 23 and the second extension portion 2132b when the battery cell 20 is subjected to vibration, impact or other working conditions can be further reduced.

In particular, in the embodiment of the present application, at least part of the surface of the extension portion 2132 facing away from the cover body 212 in the thickness direction of the cover body 212 is recessed toward the cover body 212 to form a groove 2132c.

Groove 2132c refers to a cavity structure formed by a plurality of cavity walls. For example, the recess 2132c may be a cavity structure having cavity walls at the periphery, or may be a cavity structure having openings at least at two sides formed by connecting and combining a bottom wall and at least one side wall.

By forming the grooves 2132c, the recessed portions of the extensions 2132 can be made more distant from the electrode assemblies 23 below, further reducing the risk of contact between the electrode assemblies 23 and the extensions 2132.

In the embodiment of the present application, when the surface of the side of the second extension portion 2132b facing away from the cover body 212 is recessed as a whole in the thickness direction of the cover body 212 compared with the surface of the same side of the main body portion 2131 and the first extension portion 2132a, the overall thickness of the second extension portion 2132b is smaller than the thicknesses of the main body portion 2131 and the first extension portion 2132a, and further, a step portion is formed on the side of the first extension portion 2132a facing away from the cover body 212 and the second extension portion 2132b, and the side wall and the bottom wall of the step portion are connected to form the groove 2132c. The structure of the groove 2132c thus formed is simple, and the second extension portion 2132b further reduces the risk of contact between the electrode assembly 23 and the second extension portion 2132b due to the reduced formation of the groove 2132c relative to the main body portion 2131 as a result of the overall thickness.

Referring to fig. 7 to 10, in another embodiment of the application, in the thickness direction of the cover body 212, a chamfer C or a rounded corner R is formed between at least a portion of the surface of the extension portion 2132 facing away from the cover body 212 and an end surface of the extension portion 2132 facing away from the main body 2131.

The end surface of the extension portion 2132 away from the main body portion 2131 is a surface of one end of the extension portion 2132 away from the main body portion 2131 in the extending direction of the extension portion 2132. In the embodiment of the present application, the end surface of the extension portion 2132 remote from the main body portion 2131 is an end surface remote from the main body portion 2131 in the X direction as shown in fig. 8 or 10. When the chamfer C or the rounded corner R is formed between at least a part of the surface of the extension portion 2132 facing away from the cover body 212 and the end surface of the extension portion 2132 facing away from the main body 2131 in the thickness direction of the cover body 212, it can be considered that the extension portion 2132 is formed with the chamfer C or the rounded corner R at the end facing away from the main body 2131.

Since the extension 2132 is formed with a chamfer C or rounded corner R at an end remote from the main body 2131, at least a portion of the surface of the extension 2132 facing away from the cover body 212 can be remote from the electrode assembly 23 below, further reducing the risk of contact between the electrode assembly 23 and the extension 2132. In addition, since the end of the extension portion 2132 remote from the main body portion 2131 is also sharp, providing the chamfer C or the rounded corner R can also reduce damage to the electrode assembly 23 at the sharp point.

In the embodiment of the present application, when the surface of the second extension portion 2132b facing away from the cover body 212 is entirely concave compared with the surface of the same side of the main body portion 2131 and the first extension portion 2132a in the thickness direction of the cover body 212, the surface of the second extension portion 2132b facing away from the cover body 212 may entirely form a chamfer C or a rounded corner R with the end surface of the second extension portion 2132b facing away from the main body portion 2131. The chamfer C or the rounded R thus formed is simple in structure, and the second extension portion 2132b is gradually reduced in the direction away from the main body portion 2131 due to the overall thickness, further reducing the risk of contact between the electrode assembly 23 and the second extension portion 2132 b.

Referring to fig. 5, 8 and 10, according to some embodiments of the present application, in the thickness direction of the cover body 212, the depth of the lowest point of the recess of the extension portion 2132 is H, and the thickness of the main portion 2131 protruding from the cover body 212 is H; wherein H-2 mm is more than or equal to H is more than or equal to 1mm.

When h is 1 mm or more, a minimum reliable distance can be maintained between the recessed portion of the extension 2132 and the electrode assembly 23. In addition, as described above, the extension 2132 can be connected to the insulating member 25, and therefore, when H-2 mm. Gtoreq.h, the extension 2132 can be made to have a sufficient area to provide a hot-melt connection position for the insulating member 25, improving the connection reliability of the insulating protrusion 213 and the insulating member 25.

Referring to FIG. 6, according to some embodiments of the application, the extension 2132 has a width T that is less than or equal to 3 millimeters.

The extension portion 2132 has a length, a width and a thickness, wherein the length direction is the extension direction of the extension portion 2132, the thickness direction is the same as the thickness direction of the cover body 212, the width direction is perpendicular to the length direction and the thickness direction, and the width direction is also the same as the width direction of the cover body 212, specifically, the Y direction shown in fig. 1.

When T is less than or equal to 3 mm, the extension portion 2132 has a thin rib structure, and if the extension portion 2132 does not recess toward the cover body 212 in the thickness direction of the cover body 212, the end portion of the electrode assembly 23 is more easily crushed when the battery cell 20 is subjected to vibration, impact or other working conditions. Therefore, by providing the extension portion 2132 at T3 mm or less in the thickness direction of the cap body 212, at least a part of the surface of the extension portion 2132 facing away from the cap body 212 is recessed toward the cap body 212 as compared to the surface on the same side in the main body 2131, the end of the electrode assembly 23 can be less crushed, and the reliability of the electrode assembly 23 can be improved.

In addition, when T of the extension portion 2132 is 3mm or less, the electrode terminal 211 or the adapter 24 connected to the electrode terminal 211 may be omitted due to the small width.

In particular, in an embodiment of the present application, the width T of the second extension 2132b is less than or equal to 3 millimeters.

According to some embodiments of the present application, the electrode terminal 211 is provided on the cap body 212, the main body portion 2131 and the electrode terminal 211 are spaced apart from each other in the length direction of the cap body 212, and the extension portion 2132 extends from the main body portion 2131 toward the electrode terminal 211, and a gap is provided between the electrode terminal 211 and the extension portion 2132 in the length direction of the cap body 212, the gap being not more than 2 mm; or in the width direction of the cover body 212, the extension portions 2132 are provided at intervals from the electrode terminals 211, and the projection of the extension portions 2132 toward the electrode terminals 211 has an overlapping area with the electrode terminals 211.

By providing the clearance of not more than 2 mm, the extension 2132 can be reliably led away from the electrode terminal 211, and the length of the extension 2132 can be made as long as possible to satisfy the connection requirement with the insulating member 25. In addition, since the extension portion 2132 is provided at an interval in the width direction of the cover body 212 and the electrode terminal 211, and the projection of the extension portion 2132 toward the electrode terminal 211 and the electrode terminal 211 have an overlapping area, the extension portion 2132 can extend beyond the electrode terminal 211 and no positional interference occurs between the electrode terminal 211, and thus the extension portion 2132 can have a long length and provide a sufficient area for the connection of the insulating member 25.

Referring again to fig. 4, according to some embodiments of the present application, the insulation protrusions 213 include two insulation protrusions 213, the two insulation protrusions 213 are opposite and spaced apart, and the extension portion 2132 of any insulation protrusion 213 extends toward another insulation protrusion 213.

For example, when the cover body 212 is rectangular, the two insulating protrusions 213 may be provided at opposite and spaced apart ends of the cover body 212 in the length direction of the cover body 212. This is because the insulation protrusions 213 located at both ends of the cover body 212 need to be escaped from the electrode terminals 211 or the adaptor at both ends, and thus the insulation protrusions 213 have the extension portions 2132.

Of course, in the embodiment of the present application, the end cap 21 may further include other insulating protrusions to increase the connection area with the insulating member 25, but since the other insulating protrusions do not generate positional interference with the electrode terminal 211 or the adapter, the extension 2132 may not be necessary.

According to some embodiments of the present application, the insulation protrusion 213 may include two extension portions 2132, the two extension portions 2132 being opposite to each other and disposed at a distance from each other.

Since the insulating member 25 surrounds the entire electrode assembly 23, both opposite sides of the insulating protrusions 213 need to be in a connection relationship with the insulating member 25, and thus, the provision of the opposite two extension portions 2132 can increase the connection area.

For example, when the cover body 212 is rectangular, the two extension portions 2132 of the insulation protrusion 213 may be opposite to each other in the width direction of the cover body 212 and spaced apart.

According to some embodiments of the present application, referring to fig. 3, a battery cell 20 is provided, including an end cap 21 in any of the embodiments described above.

Referring to fig. 11 and 12, according to some embodiments of the present application, the battery cell 20 further includes a case 22, an electrode assembly 23, and an insulating member 25, wherein the case 22 has an opening, the end cap 21 is covered at the opening, the electrode assembly 23 is disposed in the case 22, and the insulating member 25 is disposed in the case 22 and covers the outer circumference of the electrode assembly 23. Wherein at least part of the insulator 25 is connected to the extension 2132. The drawings of the embodiments of the present application schematically show the position AA where the insulator 25 is connected to the extension 2132.

The insulator 25 is a component having insulating properties, and in some embodiments the material of the insulator 25 may be one or more of polyethylene, polypropylene, or polyethylene terephthalate. In some embodiments, the insulator 25 may be a thin member, such as an insulating film or sheet.

The insulating member 25 is coated on the outer circumference of the electrode assembly 23, that is, the insulating member 25 is coated around the outer circumference of the electrode assembly 23. Of course, the insulating member 25 may also cover at least a portion of the bottom surface or the top surface of the electrode assembly 23.

Since at least part of the insulating member 25 is connected to the extension portion 2132 of the insulating protrusion 213 and at least part of the surface of the extension portion 2132 facing away from the cover body 212 in the thickness direction of the cover body 212 is recessed toward the cover body 212 as compared with the surface on the same side of the main body portion 2131, the connection area between the insulating member 25 and the insulating protrusion 213 can be increased, and the end portion of the electrode assembly 23 can be reduced from being crushed, thereby improving the reliability of the electrode assembly 23.

Specifically, at least part of the main body portion 2131 of the insulation protrusion 213 in the embodiment of the present application is also connected to the insulation member 25. In this way, the connection area with the insulator 25 can be increased together with the extension 2132.

Next, a battery 100 including the battery cell 20 in any of the above embodiments is also provided in the embodiments of the present application.

In addition, the embodiment of the application also provides an electric device, which comprises the battery 100 in any embodiment.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the application, and are intended to be included within the scope of the appended claims and description. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.

Claims

1. An end cap, comprising:

A cover body; and

An insulating protrusion having a main body portion and an extension portion; the main body part is arranged on the inner side of the cover body in a protruding mode, and the extension part extends from the peripheral side of the main body part and is arranged on the same side of the cover body in a protruding mode with the main body part;

Wherein, in the thickness direction of the cover body, at least part of the surface of the extension part facing away from the cover body is concave towards the cover body compared with the surface of the same side in the main body part.

2. The end cap of claim 1, wherein the extension includes a first extension and a second extension, the first extension being disposed closer to the main body than the second extension, the first extension having a width greater than a width of the second extension in a width direction of the cap body;

In the thickness direction of the cover body, at least part of the surface of the second extension part facing away from the cover body is concave towards the cover body compared with the surface of the same side of the main body part and the first extension part.

3. The end cap of claim 2, wherein a surface of the second extension portion facing away from the cap body is entirely recessed in a thickness direction of the cap body as compared to a surface of the same side of the main body portion and the first extension portion.

4. The end cap of claim 1, wherein at least a portion of the surface of the extension facing away from the cap body in the thickness direction of the cap body is recessed toward the cap body.

5. The end cap of claim 1, wherein at least a portion of a surface of the extension facing away from the cap body in a thickness direction of the cap body forms a chamfer or rounded corner with an end surface of the extension facing away from the main body portion.

6. The end cap according to any one of claims 1 to 5, wherein in a thickness direction of the cap body, a depth of a lowest point of the extension portion concave is H, and a thickness of the main body portion protruding from the cap body is H;

wherein H-2 mm is more than or equal to H is more than or equal to 1 mm.

7. The end cap of any one of claims 1-5, wherein the extension has a width T, T being less than or equal to 3 millimeters.

8. The end cap according to any one of claims 1 to 5, wherein an electrode terminal is provided on the cap body, the main body portion and the electrode terminal are provided at an interval from each other in a longitudinal direction of the cap body, and the extension portion extends from the main body portion toward the electrode terminal with a gap between the electrode terminal and an end face of the extension portion, the gap being not more than 2 mm; or alternatively

The extending portions are disposed at intervals between the electrode terminals in the width direction of the cover body, and projections of the extending portions toward the electrode terminals have overlapping areas with the electrode terminals.

9. A battery cell comprising an end cap according to any one of claims 1 to 8.

10. The battery cell of claim 9, further comprising a housing, an electrode assembly and an insulator, wherein the housing has an opening, the end cap is covered at the opening, the electrode assembly is disposed in the housing, and the insulator is disposed in the housing and is coated on the outer periphery of the electrode assembly;

wherein at least a portion of the insulator is connected to the extension.

11. A battery comprising a cell according to claim 9 or 10.

12. An electrical device comprising the battery of claim 11.