CN217768537U

CN217768537U - End cover assembly, battery monomer, battery and power consumption device

Info

Publication number: CN217768537U
Application number: CN202222192233.9U
Authority: CN
Inventors: 张长城; 马红伍; 陈烁; 丁琳婷; 张海明
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2022-08-19
Filing date: 2022-08-19
Publication date: 2022-11-08
Anticipated expiration: 2032-08-19

Abstract

The application relates to an end cover subassembly, battery monomer, battery and power consumption device, the end cover subassembly includes: the end cover unit is provided with a mounting hole for mounting the pole; the adapter plate is arranged on one side of the end cover unit and provided with a welding area corresponding to the mounting hole, and the adapter plate is connected with the pole through the welding area; a thermal insulating layer circumferentially surrounding the weld zone. Through set up the insulating layer that encircles the weld zone in the weld zone outside, can prevent effectively that the heat transfer that accumulates to other regions beyond the insulating layer at the in-process of welding adaptor piece and utmost point post, and then prevent that the seal part that is located outside the insulating layer from taking place the hot melt and influencing the free leakproofness of battery.

Description

End cover assembly, battery monomer, battery and power consumption device

Technical Field

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

Background

Energy conservation and emission reduction are the key points of sustainable development of the automobile industry, and electric vehicles become important components of the sustainable development of the automobile industry due to the advantages of energy conservation and environmental protection. For electric vehicles, battery technology is an important factor in its development.

The battery mainly comprises a shell, an electrode assembly and an end cover structure, wherein the end cover structure mainly comprises an end cover assembly, a switching sheet and a pole, and the pole is electrically connected with the electrode assembly through the switching sheet so as to output the electric energy of the electrode assembly to the outside of the shell. However, the adaptor plate and the pole are required to be connected with each other in a laser welding mode, heat generated in the welding process is collected at a welding point, and therefore hot melting of a sealing structure between the pole and the end cover assembly is caused, and the sealing performance of the battery is affected.

SUMMERY OF THE UTILITY MODEL

In view of the above problems, the present application provides an end cap assembly, a battery cell, a battery and an electric device, which can block heat generated during a welding process to ensure the sealing performance of the battery.

In a first aspect, the present application provides an end cap assembly comprising:

the end cover unit is provided with a mounting hole for mounting the pole;

the adapter plate is arranged on one side of the end cover unit and provided with a welding area corresponding to the mounting hole, and the adapter plate is connected with the pole through the welding area; and

a thermal insulating layer circumferentially surrounding the weld zone.

Through set up the insulating layer that encircles the weld zone in the weld zone outside, can effectively prevent other regions outside the heat transfer of the in-process accumulation of welding switching piece and utmost point post to the insulating layer, and then prevent that the seal part that is located outside the insulating layer from taking place the hot melt and influencing the free leakproofness of battery.

In one embodiment, the adaptor plate has a projection projecting toward the end cap unit, the welding zone being located on the projection;

the projection is covered with a heat insulating layer, the heat insulating layer covering the projection circumferentially surrounding the weld zone.

So, the heat that produces in the welding process of switching piece and utmost point post is difficult to outwards transmit under blockking of insulating layer to effectively prevent to be located the sealing member in the insulating layer outside and take place the hot melt.

In one embodiment, the insulating layer covers a surface of the protrusion facing towards and/or away from the end cap unit. By arranging the heat insulation layer on the surface of the convex part facing to and/or facing away from the end cover unit, heat generated in the welding process can be effectively collected on the welding area, and the sealing component on the outer side is effectively prevented from being hot-melted due to the fact that the heat is transmitted outwards.

In one embodiment, the boss has a boss top wall projecting into the mounting hole and a boss side wall circumferentially surrounding the boss top wall, the weld zone being located on the boss top wall;

the thermal insulation layer covers the top wall and/or the side walls of the protrusion.

Through locating the insulating layer in convex part roof and/or convex part lateral wall, can effectively concentrate the heat that produces in the welding process in the welding zone, effectively prevent that the outside sealing member that leads to the outward transmission of heat from taking place the hot melt.

In one embodiment, the area of the region where the side surface of the boss top wall facing or facing away from the end cap unit is covered with the insulating layer is 1% to 50% of the total area of the side surface. Therefore, the heat insulation effect is ensured, and meanwhile, the welding area is ensured to have enough area to be reliably connected with the pole.

In one of the embodiments, the end cap unit is covered with an insulating layer, the insulating layer covering the end cap unit circumferentially surrounding the welding zone.

Through set up the insulating layer at the end cover unit, can effectively gather the heat that produces in the welding process in the welding zone, effectively prevent that the outside sealing member that leads to the outside outward transmission from taking place the hot melt.

In one embodiment, the end cap unit includes:

the end cover body is provided with a first mounting hole; and

the insulating piece is arranged on one side, facing the adapter plate, of the end cover body in a laminated mode, and is provided with a second mounting hole which is correspondingly communicated with the first mounting hole to form a mounting hole together;

the insulating layer covers one side surface of the insulating piece far away from the end cover body and/or the hole wall of the second mounting hole, and the insulating layer covering one side surface of the insulating piece far away from the end cover body circumferentially surrounds the edge of the second mounting hole.

By covering the insulating layer on the insulating piece, heat generated in the welding process can be effectively gathered in a space defined by the mounting hole, and the sealing component on the outer side is effectively prevented from being hot-melted due to the fact that the heat is transmitted outwards.

In a second aspect, the application provides an interposer, the interposer has a welding zone for connecting a pole, the interposer is further covered with a thermal insulation layer, and the thermal insulation layer circumferentially surrounds the welding zone.

The third aspect, this application provides an end cover unit, and the mounting hole that is used for installing utmost point post is seted up to the end cover unit, and the end cover unit still is equipped with and is used for keeping apart thermal insulating layer, and the circumference setting of mounting hole is followed to the insulating layer.

In a fourth aspect, the present application provides a battery cell, including the end cover assembly in the above-mentioned embodiment, the battery cell still includes casing, electric core subassembly and utmost point post, and the casing connects each other to join in marriage with the end cover assembly and forms one jointly and hold the chamber, and the electric core subassembly is acceptd in holding the intracavity, and utmost point post is installed in the mounting hole and is connected in the electric core subassembly through the switching piece electricity.

In a fifth aspect, the present application provides a battery comprising the end cap assembly of the above embodiment.

In a sixth aspect, the present application provides an electric device including the battery in the above embodiments.

The above description is only an overview of the technical solutions of the present application, and the present application may be implemented in accordance with the content of the description so as to make the technical means of the present application more clearly understood, and the detailed description of the present application will be given below in order to make the above and other objects, features, and advantages of the present application more clearly understood.

Drawings

Various additional 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. Moreover, like reference numerals are used to refer to like elements throughout. In the drawings:

FIG. 1 is a schematic illustration of a vehicle according to an embodiment of the present application;

fig. 2 is a schematic structural diagram of a battery according to an embodiment of the present application;

fig. 3 is a schematic diagram of a battery cell according to an embodiment of the present application;

fig. 4 is an exploded view of a battery cell according to an embodiment of the present disclosure;

FIG. 5 is an exploded view of a lid assembly according to one embodiment of the present application;

fig. 6 is a schematic structural diagram of an interposer according to an embodiment of the present application;

fig. 7 is a schematic structural diagram of an interposer according to another embodiment of the present application;

FIG. 8 is an exploded view of a cap assembly according to one embodiment of the present application;

the reference numbers in the detailed description are as follows:

1000. a vehicle; 100. a battery; 200. a controller; 300. a motor;

10. a box body; 20. a first portion; 30. a second portion;

40. a battery cell; 41. an end cap assembly; 412. an end cap unit; 412a, mounting holes; 4121. an end cap body; 4121a, a first mounting hole; 4123. an insulating member; 4123a, a second mounting hole; 414. a patch; 4141. a convex portion; 4141a, boss top wall; 4141b, convex side walls; 416. a thermal insulation layer; 43. a housing; 45. an electrical core assembly; 47. and (4) a pole.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are merely used to more clearly illustrate the technical solutions of the present application, and therefore are only examples, and the protection scope of the present application is not limited thereby.

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 "including" and "having," and any variations thereof, in the description and claims of this application and the description of the above figures are intended to cover non-exclusive inclusions.

In the description of the embodiments of the present application, the technical terms "first", "second", and the like are used only for distinguishing different objects, and are not to be construed as indicating or implying relative importance or to implicitly indicate the number, specific order, or primary-secondary relationship of the technical features indicated. In the description of the embodiments of the present application, "a plurality" means two or more unless specifically defined otherwise.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase 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. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

In the description of the embodiments of the present application, the term "and/or" is only one kind of association relationship describing an associated object, and means that three relationships may exist, for example, a and/or B, and may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

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

In the description of the embodiments of the present application, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the directions or positional relationships indicated in the drawings, and are only for convenience of description of the embodiments of the present application and for simplicity of description, but do not indicate or imply that the referred device or element must have a specific direction, be constructed and operated in a specific direction, and thus, should not be construed as limiting the embodiments of the present application.

In the description of the embodiments of the present application, unless otherwise explicitly stated or limited, the terms "mounted," "connected," "fixed," and the like are used in a broad sense, and for example, may be fixedly connected, detachably connected, or integrated; mechanical connection or electrical connection is also possible; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the embodiments of the present application can be understood by those of ordinary skill in the art according to specific situations.

At present, the application of power batteries is more and more extensive from the development of market conditions. The power battery is not only applied to energy storage power supply systems such as hydraulic power, firepower, wind power and solar power stations, but also widely applied to electric vehicles such as electric bicycles, electric motorcycles and electric automobiles, and a plurality of fields such as military equipment and aerospace. With the continuous expansion of the application field of the power battery, the market demand is also continuously expanding.

The inventor notices that a sealing component such as a sealing ring is usually arranged between the pole and the end cover unit for sealing, but in the process of welding the adapter sheet and the pole of the battery, because the adapter sheet is usually formed by metal materials such as copper and aluminum, the melting point is usually above 600 ℃, the welding laser heat is continuously accumulated at the welding point, and the sealing component such as the sealing ring is usually formed by high polymer, the temperature resistance of the sealing component is usually not more than 400 ℃, therefore, the heat accumulated in the welding process can cause the sealing component such as the sealing ring to be hot-melted, the sealing performance of the battery is influenced, and further, the potential safety hazard is caused.

In order to solve the problem that the heat accumulated in the welding process causes the sealing parts of the sealing ring to be hot-melted, the inventor designs an end cover assembly through intensive research, and the heat of a welding point can be effectively isolated by arranging a heat insulation layer which surrounds a welding area along the circumferential direction, so that the heat generated by welding is not easily transferred to the sealing parts such as the sealing ring and the like on the outer side of the welding area, thereby preventing the sealing parts such as the sealing ring and the like from being hot-melted due to high temperature and ensuring the sealing performance of a battery.

The battery disclosed in the embodiment of the present application can be used in electric devices such as vehicles, ships or aircrafts, but not limited thereto. A power supply system including the battery and the like disclosed in the present application may be used.

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 automobile, a ship, a spacecraft and the like. The electric toy may include a stationary or mobile electric toy, such as a game machine, an electric car toy, an electric ship toy, an electric airplane toy, and the like, and the spacecraft may include an airplane, a rocket, a space shuttle, a spacecraft, and the like.

For convenience of description, the following embodiments are described by taking an electric device as an example of a vehicle according to an embodiment of the present application.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a vehicle 1000 according to some embodiments of the present disclosure. The vehicle 1000 may be a fuel automobile, a gas automobile, or a new energy automobile, and the new energy automobile may be a pure electric automobile, a hybrid electric automobile, or a range-extended automobile, etc. The battery 100 is provided inside 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 serve as an operation power source of the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300, the controller 200 being configured to control the battery 100 to supply power to the motor 300, for example, for power requirements for operation during starting, navigation, and traveling of the vehicle 1000.

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

Referring to fig. 2, fig. 2 is an exploded view of a battery 100 according to some embodiments of the present disclosure. The battery 100 includes a case 10 and a battery cell 40, and the battery cell 40 is accommodated in the case 10. The case 10 is used to provide a receiving space for the battery cells 40, and the case 10 may have various structures. In some embodiments, the case 10 may include a first portion 20 and a second portion 30, the first portion 20 and the second portion 30 cover each other, and the first portion 20 and the second portion 30 together define a receiving space for receiving the battery cell 40. The second part 30 may be a hollow structure with one open end, the first part 20 may be a plate-shaped structure, and the first part 20 covers the open side of the second part 30, so that the first part 20 and the second part 30 together define a receiving space; the first portion 20 and the second portion 30 may be hollow structures with one side open, and the open side of the first portion 20 is covered on the open side of the second portion 30. Of course, the housing 10 formed by the first and

second portions

20, 30 may have various shapes, such as a cylinder, a rectangular parallelepiped, etc.

In the battery 100, the number of the battery cells 40 may be multiple, and the multiple battery cells 40 may be connected in series or in parallel or in series-parallel, where in series-parallel refers to both series connection and parallel connection among the multiple battery cells 40. The plurality of battery monomers 40 can be directly connected in series or in parallel or in series-parallel, and the whole formed by the plurality of battery monomers 40 is accommodated in the box body 10; of course, the battery 100 may also be formed by connecting a plurality of battery cells 40 in series, in parallel, or in series-parallel to form a battery 100 module, and then connecting a plurality of battery 100 modules in series, in parallel, or in series-parallel to form a whole, and accommodating the whole in the case 10. The battery 100 may further include other structures, for example, the battery 100 may further include a bus member for achieving electrical connection between the plurality of battery cells 40.

Wherein each battery cell 40 may be a secondary battery or a primary battery; but is not limited to, a lithium sulfur battery, a sodium ion battery, or a magnesium ion battery. The battery cell 40 may be cylindrical, flat, rectangular parallelepiped, or other shape.

Referring to fig. 3 and 4, fig. 4 is an exploded schematic view of a battery cell 40 according to some embodiments of the present disclosure. The battery cell 40 refers to the smallest unit constituting the battery 100, and includes an end cap assembly 41, a housing 43, a battery core assembly 45, a pole 47, and other functional components.

The end cap assembly 41 refers to a member that covers an opening of the case 43 to insulate the internal environment of the battery cell 40 from the external environment. Without limitation, the shape of the endcap assembly 41 can be adapted to the shape of the housing 43 to mate with the housing 43. Alternatively, the end cap assembly 41 may be made of a material (e.g., an aluminum alloy) having a certain hardness and strength, so that the end cap assembly 41 is not easily deformed when being impacted, and the battery cell 40 may have a higher structural strength, and the safety performance may be improved.

The housing 43 is an assembly for mating with the end cap assembly 41 to form an internal environment of the battery cell 40, wherein the formed internal environment may be used to house the battery cell assembly 45, electrolyte, and other components. The housing 43 and the end cap assembly 41 may be separate components, and an opening may be provided in the housing 43, and the opening may be covered by the end cap assembly 41 to form the internal environment of the battery cell 40. Without limitation, the end cap assembly 41 and the housing 43 may be integrated, and specifically, the end cap assembly 41 and the housing 43 may form a common connecting surface before other components are inserted into the housing, and when it is necessary to enclose the inside of the housing 43, the end cap assembly 41 covers the housing 43. The housing 43 may be of various shapes and various sizes, such as rectangular parallelepiped, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing 43 may be determined according to the specific shape and size of the electric core assembly 45. The material of the housing 43 may be various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not limited in this embodiment.

The cell assembly 45 is a component of the battery cell 40 where electrochemical reactions occur. One or more electrical core assemblies 45 may be contained within the housing 43. The cell assembly 45 is mainly formed by winding or stacking a positive electrode sheet and a negative electrode sheet, and a separator is generally provided between the positive electrode sheet and the negative electrode sheet. The portions of the positive and negative electrode sheets having the active material constitute the main body portion of the cell assembly 45, and the portions of the positive and negative electrode sheets having no active material each constitute a tab. The positive electrode tab and the negative electrode tab may be located at one end of the main body portion together or at both ends of the main body portion, respectively. During the charge and discharge of the battery 100, the positive electrode active material and the negative electrode active material react with the electrolyte, and the tab is connected to the terminal 47 to form a current loop.

Referring to fig. 5 and 6, according to some embodiments of the present application, an end cap assembly 41 is provided, including an end cap unit 412, an interposer 414, and a thermal insulation layer 416. The end cover unit 412 is provided with a mounting hole 412a for mounting the pole 47, the adapter sheet 414 is arranged on one side of the end cover unit 412, the adapter sheet 414 is provided with a welding area corresponding to the mounting hole 412a, the adapter sheet 414 is connected with the pole 47 through the welding area, and the heat insulation layer 416 circumferentially surrounds the welding area.

The end cap unit 412 has a substantially rectangular sheet-like structure, and in the following embodiments, the thickness direction of the end cap assembly 41 is the Z direction in fig. 1, the length direction of the end cap assembly 41 is the X direction in fig. 1, and the width direction of the end cap assembly 41 is the Y direction in fig. 1.

The head cover unit 412 has two mounting holes 412a, and the two mounting holes 412a are provided at intervals in the longitudinal direction of the head cover assembly 41. The end cap assembly 41 includes a positive pole 47 and a negative pole 47, and the two poles 47 are respectively embedded in the two mounting holes 412a for electrically connecting with the electric core assembly 45 to output or input electric energy of the battery cell 40.

The end cap assembly 41 includes two adapter plates 414, each adapter plate 414 is a plate-shaped structure, each adapter plate 414 has a welding region, and an orthographic projection of the welding region on the end cap unit 412 is located in a range of the mounting hole 412a, and laser can penetrate through the pole 47 from one side of the end cap unit 412 to reach the welding region of the adapter plate 414, so that the adapter plate 414 and the pole 47 are connected with each other through the welding region.

The thermal insulation layer 416 may be formed of one or more of ceramic, diatomite, asbestos, glass wool, aerogel, or other materials with good thermal insulation effect, and the thermal insulation layer 416 forms a closed pattern around the welding zone along the circumferential direction, so as to reduce the heat transfer from the welding zone to the outside. It is to be understood that the material forming the thermal insulation layer 416 is not limited thereto, and the shape of the thermal insulation layer 416 may be set as needed to meet various requirements. The aforementioned "closed pattern" refers to a ring pattern without openings, and the outer contour of the closed pattern includes, but is not limited to, a circle, an ellipse, and a polygon, so that heat can be blocked from transferring outward from all directions.

By arranging the heat insulating layer 416 surrounding the welding region outside the welding region, heat accumulated in the process of welding the interposer 414 and the electrode post 47 can be effectively prevented from being transferred to other regions outside the heat insulating layer 416, and further, the sealing component outside the heat insulating layer 416 is prevented from being hot-melted to affect the sealing performance of the battery cell 40.

As shown in fig. 5, 6 and 7, according to some embodiments of the present disclosure, the adaptor plate 414 has a protrusion 4141 protruding toward the end cap unit 412, and the welding region is located at the protrusion 4141. The projection 4141 is covered with the thermal insulation layer 416, and the thermal insulation layer 416 covering the projection 4141 circumferentially surrounds the weld zone.

In order to connect the adaptor piece 414 and the pole 47 and to insulate the other part of the adaptor piece 414 not connected to the pole 47 and the end cap unit 412 from each other with a certain gap, one end of the adaptor piece 414 has a projection 4141 projecting toward the end cap unit 412, the projection 4141 can be inserted into the mounting hole 412a to be fitted to an end face of the pole 47 fitted in the mounting hole 412a, and a welding region welded to the pole 47 is formed at the center of the projection 4141. The thermal barrier layer 416 is located at the edge of the projection 4141 and circumferentially surrounds the weld area to form a closed pattern around the weld area.

In this way, the heat generated during the welding process of the adaptor plate 414 and the pole 47 is difficult to be transferred outwards under the blocking of the thermal insulation layer 416, so that the sealing component positioned outside the thermal insulation layer 416 is effectively prevented from being hot-melted.

According to some embodiments of the present application, insulation layer 416 covers the surface of boss 4141 facing toward and/or away from end cap unit 412.

Specifically, the projection 4141 has an outer surface facing toward the end cap unit 412 and an inner surface facing away from the end cap unit 412, wherein a partial region of the outer surface of the projection 4141 is fitted with the pole 47.

In one embodiment, the thermal insulation layer 416 covers the outer surface of the protrusion 4141 facing the end cap unit 412, and the specific shape and coverage area of the thermal insulation layer 416 may be set as needed to meet different thermal insulation requirements. In another embodiment, the thermal insulation layer 416 covers the inner surface of the protrusion 4141 facing away from the end cap unit 412, and the specific shape and coverage area of the thermal insulation layer 416 may be set as needed to meet different thermal insulation requirements. As a preferred embodiment, part of the thermal insulation layer 416 covers the outer surface of the protrusion 4141 facing the end cap unit 412, and part of the thermal insulation layer 416 covers the inner surface of the protrusion 4141 facing away from the end cap unit 412, so that both the inner and outer surfaces of the protrusion 4141 are covered with the thermal insulation layer 416, thereby having better thermal insulation effect.

By providing the thermal insulating layer 416 on the surface of the projection 4141 facing toward and/or away from the end cap unit 412, heat generated during welding can be effectively concentrated on the welding area, and heat transfer to the outside to fuse the outer sealing member can be effectively prevented.

According to some embodiments of the present application, tabs 4141 have a tab top wall 4141a and tab side walls 4141b that circumferentially surround tab top wall 4141a, the weld is located on tab top wall 4141a, and insulation layer 416 is provided on tab top wall 4141a and/or tab side walls 4141b.

The projection top wall 4141a is circular to match the shape of the post 47 to contact the end face of the post 47, the land is located at the center of the projection top wall 4141a, and the projection side wall 4141b is circular in shape circumferentially surrounding the projection top wall 4141 a. It is to be understood that the shape of the protrusions 4141 is not limited thereto, and in other embodiments, the protrusion top wall 4141a may have various shapes such as an oval shape, a polygonal shape, and the like.

When the thermal insulating layer 416 is provided on the outer surface of the boss 4141 facing the end cap unit 412, in some embodiments, the thermal insulating layer 416 may completely cover the remaining area of the side surface of the boss top wall 4141a facing the end cap unit 412 except for the welded area, thereby forming a circular ring pattern circumferentially surrounding the welded area. In other embodiments, the insulating layer 416 completely covers a side surface of the boss side wall 4141b facing the end cap unit 412. As a preferable embodiment, partial thermal insulating layer 416 covers a region of a side surface of boss top wall 4141a toward end cap unit 412 except for the welding region, and partial thermal insulating layer 416 covers a side surface of boss side wall 4141b toward end cap unit 412. It is to be understood that the shape of the thermal insulating layer 416 is not limited thereto, and may be provided in accordance with the shape of the boss top wall 4141 a.

When the thermal insulating layer 416 is provided on the inner surface of the projection 4141 facing away from the end cap unit 412, in some embodiments, the thermal insulating layer 416 may completely cover the remaining area of the side surface of the projection top wall 4141a facing away from the end cap unit 412 except for the welding region, thereby forming a circular ring pattern circumferentially surrounding the welding region. In other embodiments, the insulating layer 416 completely covers a side surface of the boss sidewall 4141b facing away from the end cap unit 412. As a preferred embodiment, a part of the thermal insulating layer 416 covers the remaining region of the side surface of the boss top wall 4141a facing away from the head cover unit 412 except for the welding region, and a part of the thermal insulating layer 416 covers the side surface of the boss side wall 4141b facing away from the head cover unit 412.

According to some embodiments of the present application, the area of the region where the side surface of the boss top wall 4141a facing or facing away from the end cap unit 412 is covered with the thermal insulation layer 416 is 1% to 50% of the total area of the side surface.

Specifically, when the upper surface of boss top wall 4141a facing end cap unit 412 is covered with thermal insulation layer 416, thermal insulation layer 416 covers only 1% -50% of the total area of the upper surface, and the region not covered with thermal insulation layer 416 forms a weld zone. Similarly, when the lower surface of boss top wall 4141a facing away from end cap unit 412 is covered with thermal insulation layer 416, thermal insulation layer 416 covers only 1% -50% of the total area of the lower surface, and the region not covered with thermal insulation layer 416 forms a weld zone. It will be appreciated that the specific area of the surface covered by the insulating layer 416 may be set as desired to meet different welding requirements.

Thus, while the heat insulation effect is ensured, the welding area is ensured to have enough area to be reliably connected with the pole 47.

By providing the thermal insulating layer 416 on the boss top wall 4141a and/or the boss side wall 4141b, heat generated during welding can be effectively concentrated on the welding zone, and heat transfer to the outside can be effectively prevented from causing thermal fusion of the outer sealing member.

As shown in fig. 8, according to some embodiments of the present application, end cap unit 412 is covered with an insulating layer 416, the insulating layer 416 covering end cap unit 412 circumferentially surrounding the weld zone.

In some embodiments, end cap unit 412 is covered with insulation 416 at the same time that interposer 414 covers insulation 416, and insulation 416 covering end cap unit 412 forms a closed pattern circumferentially around the weld zone, thereby further serving to prevent heat transfer outward. In other embodiments, insulation layer 416 may be covered only at end cap unit 412, which may also serve to prevent heat from being transferred outward.

By covering insulating layer 416 at end cap unit 412, heat generated during welding can be effectively concentrated at the welding zone, and heat transfer to the outside to cause heat fusion of the outer seal member can be effectively prevented.

According to some embodiments of the present application, the end cap unit 412 includes an end cap body 4121 and an insulating member 4123, the end cap body 4121 defines a first mounting hole 4121a, the insulating member 4123 is stacked on a side of the end cap body 4121 facing the adaptor plate 414, the insulating member 4123 defines a second mounting hole 4123a, and the second mounting hole 4123a and the first mounting hole 4121a are correspondingly communicated to form the mounting hole 412a. The insulating layer 416 covers a side surface of the insulator 4123 remote from the end cap body 4121 and/or a wall of the second mounting hole 4123a, and the insulating layer 416 covering a side surface of the insulator 4123 remote from the end cap body 4121 circumferentially surrounds an edge of the second mounting hole 4123 a.

The cap body 4121 has a substantially rectangular plate-like structure, and the cap body 4121 may be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, and the like. The insulator 4123 covers the end cap body 4121 on the side facing the electrical core assembly 45 for isolating the electrical connection components within the housing 43 from the end cap body 4121 to reduce the risk of short circuits. The material of the insulating member 4123 may be plastic, rubber, or the like, and the embodiment of the present application is not particularly limited thereto. The end cap body 4121 is provided with two first mounting holes 4121a penetrating along the thickness direction, and the two first mounting holes 4121a are arranged at intervals along the length direction. The insulating member 4123 has two second mounting holes 4123a penetrating in the thickness direction, and the two second mounting holes 4123a are spaced apart along the length direction and are correspondingly communicated with the two first mounting holes 4121 a. As such, the first mounting hole 4121a and the second mounting hole 4123a communicate with each other to form the mounting hole 412a for disposing the pole 47.

In some embodiments, the insulating layer 416 covers a side surface of the insulator 4123 remote from the end cap body 4121 and forms a circular ring pattern circumferentially around the second mounting hole 4123 a. In other embodiments, the insulating layer 416 completely covers the wall of the second mounting hole 4123 a. As a preferred embodiment, a portion of the thermal insulation layer 416 covers a side surface of the insulating member 4123 away from the end cap body 4121 and forms a circular ring pattern circumferentially around the area of the second mounting hole 4123a, and the portion of the thermal insulation layer 416 completely covers the hole wall of the second mounting hole 4123 a.

By providing the insulating layer 416 on the insulating member 4123, heat generated during the welding process can be effectively collected in the space defined by the second mounting hole 4123a, and the heat can be effectively prevented from being transferred to the outside to cause the heat fusion of the sealing member on the outside.

As shown in fig. 3 and 4, according to some embodiments of the present application, the present application further provides a battery cell 40 including an end cap assembly 41 according to any one of the above aspects. The battery cell 40 further includes a casing 43, a core assembly 45 and a terminal 47, the casing 43 and the end cap assembly 41 are connected to each other to define a containing cavity, the core assembly 45 is contained in the containing cavity, the terminal 47 is installed in the installation hole 412a, and is electrically connected to the core assembly 45 through the adapter plate 414.

According to some embodiments of the present application, there is also provided a battery 100 including the battery cell 40 according to any of the above aspects.

According to some embodiments of the present application, there is also provided an electrical device, including the battery 100 according to any of the above aspects, and the battery 100 is used for providing electrical energy for the electrical device.

The powered device may be any of the aforementioned devices or systems that employ battery 100.

Referring to fig. 5-7, according to some embodiments of the present application, an end cap assembly 41 is provided that includes an end cap unit 412, an interposer 414, and a thermal barrier layer 416. The end cap unit 412 is provided with a mounting hole 412a for mounting the pole 47, the adapter piece 414 is provided on one side of the end cap unit 412, the adapter piece 414 has a convex portion 4141 protruding toward the end cap unit 412, the convex portion 4141 is provided with a welding region having a corresponding mounting hole 412a, and the adapter piece 414 is connected to the pole 47 by the welding region. The heat insulating layer 416 covers the projection top wall 4141a and the projection side wall 4141b of the projection 4141 to circumferentially surround the welding region, so that heat generated in the process of welding the interposer 414 and the post 47 can be limited in the welding region by the heat insulating layer 416 and is difficult to diffuse outward to a region outside the heat insulating layer 416, thereby preventing a sealing member outside the heat insulating layer 416 from being hot-melted, further improving the sealing performance of the battery cell 40 provided with the end cap assembly 41, and prolonging the service life of the battery 100.

Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; these modifications and substitutions do not depart from the spirit of the embodiments of the present application, and they should be construed as being included in the scope of the claims and description of the present application. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. The present application is not intended to be limited to the particular embodiments disclosed herein but is to cover all embodiments that may fall within the scope of the appended claims.

Claims

1. An end cap assembly, comprising:

the end cover unit is provided with a mounting hole for mounting the pole;

a thermal insulating layer circumferentially surrounding the weld zone.

2. An end cap assembly according to claim 1, wherein the adaptor plate has a projection projecting towards the end cap unit, the weld region being located at the projection;

the convex portion is covered with the heat insulating layer, and the heat insulating layer covering the convex portion circumferentially surrounds the weld zone.

3. An end cap assembly according to claim 2, wherein the insulating layer covers a surface of the boss facing toward and/or away from the end cap unit.

4. An end cap assembly according to claim 3, wherein said boss has a boss top wall projecting into said mounting aperture and a boss side wall circumferentially surrounding said boss top wall, said weld zone being located at said boss top wall;

the thermal insulation layer covers the convex part top wall and/or the convex part side wall.

5. An end cap assembly according to claim 4, wherein the area of the region of one side surface of the boss top wall facing towards or away from the end cap unit covered by the insulating layer is 1-50% of the total area of that side surface.

6. An end cap assembly according to any one of claims 1 to 5, wherein the end cap unit is covered with the insulating layer, the insulating layer covering the end cap unit circumferentially surrounding the weld zone.

7. An end cap assembly according to claim 6, wherein the end cap unit comprises:

the end cover body is provided with a first mounting hole; and

the insulating piece is arranged on one side, facing the adapter sheet, of the end cover body in a laminated mode, and is provided with a second mounting hole, and the second mounting hole is correspondingly communicated with the first mounting hole to form the mounting hole together;

8. A battery monomer is characterized by comprising the end cover assembly according to any one of claims 1 to 7, and further comprising a shell, a battery cell assembly and a pole, wherein the shell and the end cover assembly are mutually matched and connected to define a containing cavity together, the battery cell assembly is contained in the containing cavity, and the pole is installed in the installation hole and is electrically connected to the battery cell assembly through the adapter sheet.

9. A battery comprising the cell of claim 8.

10. An electric device comprising the battery of claim 9.