CN215497014U

CN215497014U - End cover assembly, single battery, battery and electric equipment

Info

Publication number: CN215497014U
Application number: CN202122358890.1U
Authority: CN
Inventors: 李振
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2021-09-27
Filing date: 2021-09-27
Publication date: 2022-01-11
Anticipated expiration: 2031-09-27

Abstract

The application relates to an end cover assembly, a battery monomer, a battery and electric equipment, and relates to the field of batteries. The application provides an end cover assembly which comprises an end cover, a battery body and a cover, wherein the end cover is provided with a liquid injection hole for injecting electrolyte into the interior of the battery body; the sealing nail is used for being installed at the liquid injection hole and comprises a body and a supporting piece embedded in the body, the axis of the supporting piece is overlapped with the axis of the body, and the rigidity of the supporting piece is greater than that of the body and is used for supporting the body; and in a plane perpendicular to the axial direction of the liquid injection hole, the projection of the supporting piece is positioned in the projection of the liquid injection hole. The application of the end cover assembly can improve the production efficiency of the battery and enlarge the capacity of the battery.

Description

End cover assembly, single battery, battery and electric equipment

Technical Field

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

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.

As the demand of the market for batteries gradually increases, it is important to improve the production efficiency of the batteries and expand the capacity of the batteries.

SUMMERY OF THE UTILITY MODEL

The purpose of this application is to provide an end cover subassembly, battery monomer, battery and consumer. The end cover assembly can improve the production efficiency of the battery and enlarge the capacity of the battery.

On one hand, the application provides an end cover assembly which comprises an end cover, a battery body and a cover, wherein the end cover is provided with a liquid injection hole for injecting electrolyte into the battery body; the sealing nail is used for being installed at the liquid injection hole and comprises a body and a supporting piece embedded in the body, the axis of the supporting piece is overlapped with the axis of the body, and the rigidity of the supporting piece is greater than that of the body and is used for supporting the body; and in a plane perpendicular to the axial direction of the liquid injection hole, the projection of the supporting piece is positioned in the projection of the liquid injection hole.

The application discloses end cover assembly, sealed nail include the body and bury underground in this internal support piece, and support piece's rigidity is greater than the rigidity of body, and the body can seal with annotating the inner wall interference fit in liquid hole in order to annotate the liquid hole. The support piece is used for supporting the body, and at the in-process of the sealed nail of impressing, the increase of sealed nail size in week is reduced, reduces the resistance between the inner wall of body and notes liquid mouth, has reduced effectively that sealed nail impresses the in-process and has warp the risk of bullet nail and askew nail, has improved the installation effectiveness of sealed nail, has improved the production efficiency of battery, does benefit to the productivity that enlarges the battery.

In some embodiments of the present application, the support member includes a first section and a second section connected in series along an axial direction thereof, the second section is closer to an inside of the battery cell than the first section, and a projection of the first section is located within a projection of the second section in a plane perpendicular to an axial direction of the liquid injection hole.

In the above scheme, this kind of mode of setting is strengthened the one end that sealed nail set up the second section, further reduces the deformation volume that sealed nail set up the one end of second section, has played the guide effect to sealed nail, is convenient for impress sealed nail notes liquid hole.

In some embodiments of the present application, the body has a first end face and a second end face which are oppositely arranged in the axial direction of the pour hole, and the two ends of the support member are flush with the first end face and the second end face, respectively.

In the above scheme, this kind of mode of setting, at the in-process of the sealed nail of impressing, the body with annotate the inner wall of liquid hole and just contact and produce when extrudeing, support piece can play the supporting role to the body, support piece is good to the support effect of body, is convenient for impress sealed nail and annotates the liquid hole.

In some embodiments of the present application, the outer circumferential surface of the body includes a first surface, a second surface, and a step surface for connecting the first surface and the second surface, and the first surface and the second surface are both conical surfaces that gradually decrease toward the inside of the battery cell along the axial direction of the liquid injection hole.

In the scheme, the arrangement mode has the advantages that in the process of pressing the sealing nail into the liquid injection hole, the conical first surface and the conical second surface have certain guiding effects, and the problem of askew nail of the sealing nail can be effectively prevented. Meanwhile, the step surface can be abutted against one side of the end cover facing the interior of the battery cell, and when the battery cell is inverted (the sealing nail faces downwards along the direction of gravity) or the sealing nail is interfered by external factors, the step surface can prevent the sealing nail from being separated from the liquid injection hole.

In some embodiments of the present application, the first surface is configured to be in interference fit with an inner wall of the liquid injection hole, and the step surface is configured to abut against a side of the end cap facing the inside of the battery cell.

In the above arrangement, the step surface is configured to abut against one side of the end cap facing the interior of the battery cell, and when the battery cell is inverted (the sealing nail faces downward in the direction of gravity) or the sealing nail is interfered by external factors, the step surface can prevent the sealing nail from being removed from the liquid injection hole.

In some embodiments of the present application, the body has a first end face and a second end face that are disposed opposite to each other in the axial direction of the liquid injection hole, the second end face is closer to the inside of the battery cell than the first end face, and the center of gravity of the seal nail is located between the step face and the second end face.

In the above scheme, this kind of mode of setting, at the in-process of impressing sealed nail, sealed nail has the trend of tenesmus, has certain guide effect, and the askew problem of nail is difficult to appear in sealed nail, is convenient for impress sealed nail annotate the liquid downthehole, has improved sealed nail's installation effectiveness.

In some embodiments of the present application, the density of the support is greater than the density of the body.

In the above scheme, this kind of mode of setting, the quality increase of sealed nail has reduced the probability that sealed nail appears the bail in leading the pipe of nail, and then has improved the installation effectiveness of sealed nail.

In another aspect, the present application provides a battery cell including the end cap assembly described above.

In yet another aspect, the present application provides a battery including the battery cell described above.

In yet another aspect, the present application provides an electric device comprising the battery mentioned above, wherein the battery is used for providing electric energy.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.

FIG. 1 is a schematic structural diagram of a vehicle according to an embodiment of the present disclosure;

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

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

FIG. 4 is an exploded view of an end cap assembly provided in accordance with an embodiment of the present application;

FIG. 5 is a schematic structural view of a seal pin (showing a support) provided in accordance with an embodiment of the present application;

FIG. 6 is a schematic view of a support according to an embodiment of the present disclosure;

FIG. 7 is a schematic view of another embodiment of a support member according to the present disclosure;

FIG. 8 is a schematic view of another embodiment of a support member according to the present disclosure;

FIG. 9 is a cross-sectional view of a seal pin provided in accordance with an embodiment of the present application;

FIG. 10 is a schematic structural view of a seal pin (support not shown) provided in accordance with an embodiment of the present application;

FIG. 11 is a cross-sectional view of a seal pin provided in accordance with an embodiment of the present application;

FIG. 12 is an assembly view of an end cap assembly provided in accordance with an embodiment of the present application;

FIG. 13 is an enlarged partial view of an endcap assembly provided in accordance with an embodiment of the present application.

Icon: 1-an end cap assembly; 11-end cap; 111-liquid injection hole; 12-sealing nails; 121-body; 1211 — a first end face; 1212-a second end face; 1213-first surface; 1214-a second surface; 1215-a step surface; 122-a support; 1221-first stage; 1222-a second segment; 10-a battery cell; 13-an electrode terminal; 2-a shell; 3-an electrical core assembly; 31-a tab; 20-a box body; 21-a first part; 22-a second part; 100-a battery; 200-a controller; 300-a motor; 1000-vehicle.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.

In the description of the present application, it should be noted that the terms "inside", "outside", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the application usually place when using, and are only used for convenience in describing the present application and simplifying the description, but do not indicate or imply that the devices or elements that are referred to must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.

In the description of the present application, it is also to be noted that, unless otherwise explicitly specified or limited, the terms "disposed" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

At present, the application of the power battery is more and more extensive from the development of market situation. 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, electric automobiles and the like, 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 the electrolyte is injected into the interior of the battery cell through the electrolyte injection hole formed in the end cover, and after the electrolyte injection is completed, the electrolyte injection hole needs to be sealed by using the sealing nail, so that the electrolyte is prevented from flowing out. In order to ensure the sealing performance of the liquid injection hole, the sealing nail is usually made of rubber and has certain elasticity, and the sealing nail is in interference fit with the liquid injection hole. At the in-process of the sealed nail of installation, annotate the inner wall in liquid hole and can extrude sealed nail, along the thickness direction of end cover (promptly along annotating the axis direction in liquid hole, also the axis direction of sealed nail), sealed nail will be compressed, sealed nail's axial dimension will reduce. Since the material has a poisson ratio (transverse deformation coefficient), that is, the material has a certain ratio relationship between transverse positive strain and axial positive strain when being pulled or compressed in a single direction, common materials, such as rubber, steel, etc., decrease in axial dimension and increase in transverse dimension (circumferential dimension or radial dimension) when being compressed. Therefore, when the axial dimension of the sealing nail is reduced, the circumferential dimension of the sealing nail is increased, so that the sealing nail cannot be pressed into the liquid injection hole smoothly, the problems of deformation and ejection of the sealing nail, damage of the inclined nail and the like even occur, the efficiency of installing the sealing nail is low, the production efficiency of the battery is influenced, and the productivity of the battery is further influenced.

In order to reduce the problems of deformation and ejection of the sealing nail and damage of the crooked nail and improve the installation efficiency of the sealing nail, the applicant researches and discovers that a supporting piece can be arranged in the sealing nail, so that the deformation quantity of the sealing nail generated when the sealing nail is extruded in the axial direction is reduced, the influence of the sealing nail on the circumferential dimension caused by reduction of the axial dimension is further reduced, namely the increase of the sealing nail on the circumferential dimension is reduced, and the problem of interference between the sealing nail and a liquid injection hole caused by the increase of the circumferential dimension of the sealing nail is relieved.

Based on the consideration, the applicant has designed an end cover assembly, and sealed nail includes the body and buries the support piece in this internal underground, and support piece's axis and the axis coincidence of body and support piece are used for supporting the body for when the body of sealed nail is receiving the inner wall extrusion of annotating the liquid hole, the body of sealed nail can not produce great deformation in axial and circumference, can effectually slow down the body of sealed nail and annotate the interference problem in liquid hole. Simultaneously, in the plane of the thickness direction of perpendicular to end cover, the projection of support piece is located annotates the projection in the liquid hole for support piece can not take place to interfere with annotating the liquid hole when supporting the body, and support piece can not hinder the installation of sealed nail.

Under the background that the productivity demand to the battery increases day by day, the end cover subassembly of this application, less effectively sealed nail installation in-process warp the bullet nail and askew the problem of nail damage, improved the installation effectiveness of sealed nail, reduced the free encapsulation time of battery, and then enlarged the productivity of battery.

The end cover assembly, the battery cell and the battery disclosed by the embodiment of the application can be used for electric equipment such as vehicles, ships or aircrafts, but not limited to. The power supply system including the end cap assembly, the battery cell, 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 flat panel, 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 of the embodiments of the present application as an example of a vehicle.

As shown in fig. 1, fig. 1 is a schematic structural diagram of a vehicle 1000 according to some embodiments of the present application. 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 power the motor 300, for example, for start-up, navigation, and operational power requirements while the vehicle 1000 is traveling.

In some embodiments of the present application, the battery 100 may be used not only as an operating power source of the vehicle 1000, but also 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.

As shown in fig. 2, fig. 2 is a schematic structural diagram of a battery 100 according to some embodiments of the present disclosure. The battery 100 includes a case 20 and a battery cell 10, and the battery cell 10 is accommodated in the case 20. The case 20 is used to provide a receiving space for the battery cell 10, and the case 20 may have various structures. In some embodiments, the case 20 may include a first portion 21 and a second portion 22, the first portion 21 and the second portion 22 cover each other, and the first portion 21 and the second portion 22 together define a receiving space for receiving the battery cell 10. The second part 22 may be a hollow structure with one open end, the first part 21 may be a plate-shaped structure, and the first part 21 covers the open side of the second part 22, so that the first part 21 and the second part 22 define a receiving space together; the first portion 21 and the second portion 22 may be both hollow structures with one side open, and the open side of the first portion 21 may cover the open side of the second portion 22. Of course, the box 20 formed by the first portion 21 and the second portion 22 may have various shapes, such as a cylinder, a rectangular parallelepiped, and the like.

In the battery 100, the number of the battery cells 10 may be multiple, and the multiple battery cells 10 may be connected in series or in parallel or in series-parallel, where in series-parallel refers to that the multiple battery cells 10 are connected in series or in parallel. The plurality of single batteries 10 can be directly connected in series or in parallel or in series-parallel, and the whole formed by the plurality of single batteries 10 is accommodated in the box body 20; of course, the battery 100 may also be formed by connecting a plurality of battery cells 10 in series, in parallel, or in series-parallel to form a battery module, and then connecting a plurality of battery modules in series, in parallel, or in series-parallel to form a whole, and accommodating the whole in the case 20. 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 10.

Wherein, each battery cell 10 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 10 may be cylindrical, flat, rectangular parallelepiped, or other shape.

As shown in fig. 3, fig. 3 is a schematic structural diagram of a battery cell 10 according to some embodiments of the present disclosure. The battery cell 10 refers to the smallest unit constituting the battery 100. As shown in fig. 3, the battery cell 10 includes an end cap 11, a housing 2, a cell assembly 3, and other functional components.

The end cap 11 refers to a member that covers an opening of the case 2 to insulate the internal environment of the battery cell 10 from the external environment. Without limitation, the shape of the end cap 11 may be adapted to the shape of the housing 2 to fit the housing 2. Alternatively, the end cap 11 may be made of a material (e.g., an aluminum alloy) having a certain hardness and strength, so that the end cap 11 is not easily deformed when being extruded and collided, and the single battery 10 may have a higher structural strength and improved safety performance. The material of the end cap 11 may also be various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not limited in this embodiment. The end cap 11 may be provided with functional components such as the electrode terminal 13. The electrode terminals 13 may be used to electrically connect with the electric core assembly 3 for outputting or inputting electric power of the battery cell 10. In some embodiments, the end cap 11 may further be provided with a pressure relief mechanism for relieving the internal pressure when the internal pressure or temperature of the battery cell 10 reaches a threshold value. In some embodiments, insulation may also be provided on the inside of the end cap 11, which may be used to isolate the electrical connection components within the housing 2 from the end cap 11 to reduce the risk of short circuits. Illustratively, the insulator may be plastic, rubber, or the like.

The housing 2 is an assembly for mating with the end cap 11 to form the internal environment of the battery cell 10, wherein the formed internal environment may be used to house the cell assembly 3, electrolyte, and other components. The housing 2 and the end cap 11 may be separate components, and an opening may be formed in the housing 2, and the opening may be covered by the end cap 11 to form the internal environment of the battery cell 10. Without limitation, the end cap 11 and the housing 2 may be integrated, and specifically, the end cap 11 and the housing 2 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 2, the end cap 11 covers the housing 2. The housing 2 may be of various shapes and sizes, such as rectangular parallelepiped (as shown in fig. 3), cylindrical, hexagonal prism, etc. Specifically, the shape of the housing 2 may be determined according to the specific shape and size of the electric core assembly 3. The material of the housing 2 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 3 is a component in which electrochemical reactions occur in the battery cell 10. One or more electrical core assemblies 3 may be contained within the housing 2. The core assembly 3 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 core assembly 3, and the portions of the positive and negative electrode sheets having no active material each constitute the tab 31. 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 and negative active materials react with the electrolyte, and the tab 31 is connected to the electrode terminal 13 to form a current loop.

Fig. 4 is an exploded view of the end cap assembly 1 of some embodiments of the present application, as shown in fig. 3 and 4. The application provides an end cap assembly 1 for a battery cell 10, the end cap assembly 1 comprising an end cap 11 and a seal nail 12. The end cap 11 is opened with a liquid inlet 111 for injecting an electrolyte into the battery cell 10. The sealing nail 12 is used for being installed at the liquid injection hole 111, the sealing nail 12 comprises a body 121 and a support member 122 embedded in the body 121, the axis of the support member 122 is overlapped with the axis of the body 121, and the rigidity of the support member 122 is greater than that of the body 121, so as to support the body 121. Wherein, in a plane perpendicular to the axial direction of the liquid pouring hole 111, the projection of the support member 122 is located within the projection of the liquid pouring hole 111.

In some embodiments of the present disclosure, as shown in fig. 4, the axial direction of the pour hole 111 is the thickness direction of the lid 11, that is, the axial direction of the seal pin 12 after the seal pin 12 is installed in the pour hole 111. It can be understood that, after the sealing nail 12 is mounted on the pouring hole 111, the axis of the sealing nail 12 coincides with the axis of the pouring hole 111, and the axial direction of the sealing nail 12 and the axial direction of the pouring hole 111 are both the thickness direction of the lid 11.

The sealing nail 12 is used for being installed at the liquid injection hole 111 and sealing the liquid injection hole 111 to prevent the electrolyte from flowing out. In order to improve the sealing performance between the sealing nail 12 and the liquid injection hole 111, the sealing nail 12 should be in interference fit with the liquid injection hole 111, and the sealing nail 12 should have certain elasticity so as to be closely attached to the inner wall of the liquid injection hole 111, and ensure that the electrolyte does not flow out along the gap between the sealing nail 12 and the liquid injection hole 111 when the battery cell 10 is inverted (the sealing nail 12 faces downward along the direction of gravity), and the body 121 of the sealing nail 12 may be made of elastic and insulating materials such as rubber and silica gel. Simultaneously, because electrolyte has certain corrosivity, fluororubber, chloroprene rubber, brominated butyl rubber etc. can be chooseed for use to body 121 to make body 121 can be applicable to the inside electrolyte environment of battery monomer 10, be difficult for by electrolyte corruption and ageing-accelerated, have longer life, reduced the risk that electrolyte seepage appears because body 121's material problem.

The support 122 is embedded in the body 121 of the seal nail 12, and the rigidity of the support 122 is greater than that of the body 121, so as to support the body 121. The body 121 has elasticity, when the body 121 is extruded along the axial direction thereof to generate deformation, because the support 122 has greater rigidity, on the one hand, along the axial direction of the body 121, the support 122 plays a supporting role for the body 121, the compression amount of the body 121 is reduced, and further the size of the body 121 increased in the circumferential direction due to compression is reduced, on the other hand, the deformation amount of the support 122 per se can be ignored, namely the deformation amount of the support 122 per se in the axial direction and the circumferential direction can be ignored, compared with the traditional sealing nail 12 made of rubber, because the support 122 occupies a certain volume of the sealing nail 12, the support 122 per se does not generate deformation, and the size increase amount of the sealing nail 12 in the circumferential direction is also reduced. Therefore, no matter from the supporting function of the supporting piece 122 to the body 121, or from the negligible deformation of the supporting piece 122 itself, the arrangement of the supporting piece 122 can reduce the problems of nail bouncing, nail skewing and the like caused by the increase of the circumferential dimension in the installation process of the sealing nail 12, and further improve the installation efficiency of the sealing nail 12.

Specifically, the supporting member 122 may be made of steel, titanium, aluminum alloy, or other metal with relatively high rigidity, or the supporting member 122 may be made of ABS (Acrylonitrile Butadiene Styrene) engineering plastic, super-strong nylon, acrylic, or other hard polymer materials, or the supporting member 122 may be made of carbon fiber, glass fiber, or other composite materials. The material of the supporting member 122 is not limited in the present application, and accordingly, the supporting member 122 has a rigidity higher than that of the body 121 so as to support the body 121.

The axis of the support member 122 coincides with the axis of the body 121, in the process of pressing the seal nail 12 in, along the circumference of the body 121, that is, the circumference of the support member 122, the support effect of the support member 122 on the body 121 is relatively consistent, the body 121 is not easy to have the problem that a part of deformation is large and the other part of deformation is small, the risk that the seal nail 12 is askew and the nail is bounced due to the overlarge deformation of the part of the body 121 in the process of pressing the seal nail 12 in the liquid injection hole 111 is reduced, and the installation efficiency of the seal nail 12 is ensured.

The fact that the projection of the support member 122 is located within the projection of the pour hole 111 in a plane perpendicular to the axial direction of the pour hole 111 means that the projection of the support member 122 is located within the projection of the pour hole 111 because the support member 122 has high rigidity, in order to avoid the seal nail 12 and the lid 11 from being damaged by rigid collision between the support member 122 and the lid 11 or the inner wall of the pour hole 111 during pressing of the seal nail 12. In this arrangement, when the seal nail 12 is pressed in, the support member 122 can be directly inserted into the pour hole 111 without interfering with the end cap 11 or the inner wall of the pour hole 111.

It should be noted that, when the sealing nail 12 is pressed in, the sealing nail 12 should be pressed in the axial direction of the pouring hole 111, and at the same time, the axis of the sealing nail 12, i.e. the axis of the main body 121 and the axis of the support 122 should coincide with the axis of the pouring hole 111, so that the sealing nail 12 is aligned with the pouring hole 111, and interference between the sealing nail 12 and the end cap 11 or the inner wall of the pouring hole 111 due to deviation of the path when the sealing nail 12 is pressed in the pouring hole 111 is avoided.

Further, the inner wall of the liquid inlet 111 may be a cylindrical surface, such as a cylindrical surface or a prismatic surface, or may be a tapered surface, such as a conical surface or a pyramidal surface. The outer peripheral surface of the body 121 of the seal pin 12 may be a cylindrical surface, a prismatic surface, a conical surface, a pyramidal surface, or the like corresponding to the inner wall of the pour hole 111, and the support 122 of the seal pin 12 may be a rotator having the axis of the support 122, that is, the axis of the body 121, as a rotation axis. This kind of mode of setting, on the one hand, annotate the liquid hole 111 and the sealed nail 12 the shape is comparatively regular, along the circumference of body 121, and the pressure that each position of body 121 received is comparatively even, the installation of sealed nail 12 of being convenient for, on the other hand, the axis coincidence of body 121 and support piece 122 can reduce effectively and play the phenomenon emergence of nail, askew nail, the installation of sealed nail 12.

The application of the end cover assembly 1, sealed nail 12 include body 121 and bury the support piece 122 in body 121 underground, and the rigidity of support piece 122 is greater than the rigidity of body 121, and body 121 can with annotate the inner wall laminating and the interference fit of liquid hole 111 and seal with annotating liquid hole 111. The supporting member 122 is used for supporting the body 121, and in the process of pressing the sealing nail 12 in, the increase of the size of the sealing nail 12 in the circumferential direction is reduced, the resistance between the body 121 and the inner wall of the liquid injection port is reduced, so that the risk of deformation, nail ejection and nail skewing in the pressing process of the sealing nail 12 is effectively reduced, the installation efficiency of the sealing nail 12 is improved, and the productivity of the battery cell 10 and the productivity of the battery 100 are further increased.

Fig. 5 is a schematic structural view of a seal nail according to some embodiments of the present application, as shown in fig. 5. In some embodiments of the present application, the support 122 includes a first section 1221 and a second section 1222 connected in series along the axial direction thereof, the second section 1222 is closer to the inside of the battery cell 10 than the first section 1221, and a projection of the first section 1221 is located within a projection of the second section 1222 in a plane perpendicular to the axial direction of the liquid pouring hole 111.

As shown in fig. 5, it can be appreciated that the second segment 1222 is larger in size in the circumferential direction than the first segment 1221. Further, the second section 1222 is closer to the inside of the battery cell 10 than the first section 1221, that is, in the process of pressing the sealing nail 12 into the pour hole 111, the end of the sealing nail 12 where the second section 1222 is provided first contacts the inner wall of the pour hole 111. Accordingly, the end of the sealing nail 12 provided with the second section 1222 should serve as a guide for the sealing nail 12, and the deformation amount of the end of the sealing nail 12 provided with the second section 1222 should be smaller than that of the other end of the sealing nail 12, so as to facilitate the pressing-in of the sealing nail 12. Therefore, by setting the circumferential dimension of the second end to be larger than the circumferential dimension of the first end, the second section 1222 of the supporting member 122 has a better supporting effect on the body 121 than the first section 1221, and the second section 1222 with negligible deformation occupies more volume of the sealing nail 12, so that the deformation amount of the end of the sealing nail 12 where the second section 1222 is arranged is small, and is easy to press into the liquid injection hole 111, thereby playing a guiding role.

Further, in this arrangement, with the same material density and uniformity of the support 122, the center of gravity of the support 122 will be offset toward the second section 1222, such that the center of gravity of the seal nail 12 is also offset toward the second section 1222, i.e., the end of the seal nail 12 where the second section 1222 is disposed is heavier than the other end of the seal nail 12. Therefore, the end of the sealing pin 12 with the second section 1222 tends to drop under the force of gravity, facilitating the alignment of the sealing pin 12 with the pour hole 111 and the pressing into the pour hole 111.

It should be noted that the first section 1221 and the second section 1222 of the supporting member 122 are not limited in the structural form. In some embodiments of the present application, the first section 1221 of the support 122 may be a cylinder of constant diameter, such as a cylinder or prism; in other embodiments of the present application, the first section 1221 may also be a variable diameter cylinder, such as a pyramid or a frustum, etc. Accordingly, in some embodiments of the present application, the second section 1222 of the support 122 may be a cylinder of constant diameter, such as a cylinder or prism; in other embodiments of the present application, the second segment 1222 may also be a variable diameter cylinder, such as a pyramid or a frustum, etc.; in still other embodiments of the present application, the second section 1222 may be a revolving body with its axis as a rotation axis, such as a table, a sphere, an ellipsoid, etc., and it is understood that the outer circumference of the second section 1222 is rotated around its axis by a curve, wherein the curve may be a parabola, a hyperbola, a catenary, etc.

Specifically, in some embodiments of the present application, the end of the second section 1222 having the smallest cross-sectional area is connected to the first section 1221. For example, as shown in fig. 6, fig. 6 is a structural schematic view of a support member according to some embodiments of the present application, and the second section 1222 is a circular truncated cone, and the end with a small diameter (small cross-sectional area) of the circular truncated cone is connected to the first section 1221; for another example, as shown in fig. 7, fig. 7 is another structural diagram of the supporting member according to some embodiments of the present application, and the second section 1222 is a table body with an arc-shaped outer circumference, and the end with a small diameter (small cross-sectional area) of the table body is connected to the first section 1221. In other embodiments of the present application, the cross-sectional area of the second section 1222 increases and then decreases along the axis of the support 122, for example, as shown in fig. 8, fig. 8 is a further structural schematic view of the support of some embodiments of the present application, the second section 1222 is a sphere taken by a plane, and one end of the second section 1222 taken by a plane is used for connecting with the first section 1221.

In the plane perpendicular to the axial direction of the liquid injection hole 111, the projection of the first section 1221 of the support 122 is located in the projection of the second section 1222, and the second section 1222 is closer to the inside of the battery cell 10 than the first section 1221, in this way, the end of the sealing nail 12, which is in contact with the inner wall of the liquid injection hole 111 first, is reinforced, the deformation amount of the sealing nail 12 at this end is further reduced, the sealing nail 12 is guided, and the sealing nail 12 is convenient to press into the liquid injection hole 111.

FIG. 9 is a cross-sectional view of a sealing spike of some embodiments of the present application, as shown in FIG. 9. In some embodiments of the present application, the body 121 has a first end surface 1211 and a second end surface 1212 that are oppositely disposed along the axial direction of the pour hole 111, and the two ends of the support 122 are flush with the first end surface 1211 and the second end surface 1212, respectively.

As shown in fig. 9, that two ends of the supporting member 122 are flush with the first end surface 1211 and the second end surface 1212, respectively, means that two end surfaces of the supporting member 122 are coplanar with the first end surface 1211 and the second end surface 1212, respectively. It can also be understood that the size of the support 122 is the same as the size of the body 121 in the axial direction of the support 122, that is, the axial direction of the body 121.

In other embodiments of the present application, it is also possible that one end of the supporting member 122 is flush with the first end surface 1211, and the other end of the supporting member 122 is located in the second end surface 1212 or protrudes from the second end surface 1212. In still other embodiments of the present application, it is also possible that one end of the support 122 is flush with the second end face 1212, and the other end of the support 122 is located within the first end face 1211. In still other embodiments of the present application, it is also possible that two ends of the supporting element 122 are respectively located in the first end surface 1211 and the second end surface 1212, i.e., the body 121 covers the supporting element 122.

It should be noted that the supporting member 122 is configured to be able to protrude only from the second end face 1212, that is, the supporting member 122 is able to protrude only from the end face closer to the inside of the battery cell 10, of the first end face 1211 and the second end face 1212. In the process of pressing the sealing nail 12, an external force is applied to the sealing nail 12 through the first end 1211, and if the supporting member 122 protrudes from the first end 1211, the external force cannot be effectively transmitted to the sealing nail 12 and damages the sealing nail 12, and therefore, the supporting member 122 is configured to protrude from the second end 1212 only.

In addition, when the supporting member 122 protrudes from the second end face 1212, the supporting member 122 may be in direct contact with the electrolyte inside the battery cell 10, and therefore, when the supporting member 122 protrudes from the second end face 1212, the supporting member 122 should be made of a corrosion-resistant and insulating material, such as super-strong nylon, carbon fiber, glass fiber, and the like.

According to the arrangement mode, in the process of pressing the sealing nail 12 in, the two ends of the support member 122 are respectively flush with the first end surface 1211 and the second end surface 1212 at the two ends of the body 121, when the body 121 just contacts with the inner wall of the liquid injection hole 111 and is extruded, the support member 122 can support the body 121, the support effect of the support member 122 on the body 121 is good, and the sealing nail 12 can be conveniently pressed in the liquid injection hole 111.

Fig. 10 is a schematic structural view of a sealing nail according to some embodiments of the present application, and fig. 11 is a sectional view of the sealing nail according to some embodiments of the present application, as shown in fig. 10 and 11. In some embodiments of the present application, the outer peripheral surface of the body 121 includes a first surface 1213 and a second surface 1214 and a step surface 1215 for connecting the first surface 1213 and the second surface 1214, and each of the first surface 1213 and the second surface 1214 is a conical surface that gradually decreases toward the inside of the battery cell 10 in the axial direction of the liquid injection hole 111.

As shown in fig. 10 and 11, the first surface 1213 and the second surface 1214 are conical surfaces, the smallest diameter end of the first surface 1213 is connected to the largest diameter end of the second surface 1214 by a step surface 1215, and the largest diameter of the second surface 1214 is larger than the smallest diameter of the first surface 1213, so that the step surface 1215 is formed by the part of the largest diameter end of the second surface 1214 which exceeds the smallest diameter end of the first surface 1213. Further, the first surface 1213 and the second surface 1214 are conical surfaces that are gradually reduced toward the inside of the battery cell 10 in the axial direction of the liquid pouring hole 111, and therefore, the step surface 1215 faces from the second surface 1214 toward the first surface 1213, i.e., the side of the step surface 1215 facing away from the inside of the battery cell 10.

In this arrangement, the outer peripheral surface of the body 121 is the first surface 1213 and the second surface 1214 which are conical, and when the seal nail 12 is pressed into the liquid injection hole 111, the first surface 1213 and the second surface 1214 which are conical have a certain guiding function, so that the problem of nail skewing of the seal nail 12 can be effectively prevented. Meanwhile, the step surface 1215 faces the side away from the inside of the battery cell 10, that is, the step surface 1215 can abut against the side of the end cap 11 facing the inside of the battery cell 10, and when the battery cell 10 is inverted (the sealing nail 12 faces downward in the direction of gravity) or the sealing nail 12 is interfered by external factors, the step surface 1215 can prevent the sealing nail 12 from being removed from the liquid injection hole 111.

Fig. 12 is an assembly view of an end cap assembly according to some embodiments of the present application, as shown in fig. 12. In some embodiments of the present application, the first surface 1213 is configured to have an interference fit with the inner wall of the pour hole 111, and the step surface 1215 is configured to abut against a side of the end cap 11 facing the inside of the battery cell 10.

As shown in FIG. 12, the first surface 1213 being configured to have an interference fit with the inner wall of the pour spout 111 means that the body 121 and the pour spout 111 are in an interference fit by the first surface 1213 engaging and pressing against the inner wall of the pour spout 111. The first surface 1213 is a conical surface, and the inner wall of the liquid inlet 111 is a conical surface corresponding to the first surface 1213.

It should be noted that the slope of the first surface 1213 may be the same as or different from the slope of the inner wall of the pour spout 111. The inclination is an angle between the first surface 1213 and the axis of the body 121, or an angle between the inner wall of the pour spout 111 and the axis of the pour spout 111. Specifically, the inclination of the first surface 1213 may be equal to the inclination of the inner wall of the electrolyte injection hole 111, or the inclination of the first surface 1213 may be slightly greater than the inclination of the inner wall of the electrolyte injection hole 111, so as to slightly increase the elastic force between the body 121 and the inner wall of the electrolyte injection hole 111 at the end of the body 121 away from the interior of the battery cell 10, thereby ensuring the connection stability between the seal pin 12 and the electrolyte injection hole 111.

FIG. 13 is an enlarged partial view of an endcap assembly according to some embodiments of the present application, as shown in FIG. 13. The stepped surface 1215 is configured to abut against a side of the end cap 11 facing the inside of the battery cell 10, and when the battery cell 10 is inverted (the sealing nail 12 faces downward in the direction of gravity) or the sealing nail 12 is disturbed by external factors, the stepped surface 1215 can prevent the sealing nail 12 from being removed from the liquid injection hole 111.

The interference fit between the first surface 1213 and the inner wall of the liquid injection hole 111 serves to seal the liquid injection hole 111, and thus the electrolyte is prevented from leaking from the gap between the liquid injection hole 111 and the first surface 1213. Meanwhile, the step surface 1215 is attached to the side of the end cap 11 facing the inside of the battery cell 10, and prevents the seal nail 12 from coming off the injection hole 111, that is, prevents the electrolyte from flowing out of the injection hole 111.

In some embodiments of the present application, the body 121 has a first end face 1211 and a second end face 1212 that are oppositely disposed in the axial direction of the liquid injection hole 111, the second end face 1212 is closer to the inside of the battery cell 10 than the first end face 1211, and the center of gravity of the sealing nail 12 is located between the step face 1215 and the second end face 1212.

Wherein the center of gravity of the sealing pin 12 is located between the step surface 1215 and the second end surface 1212, the second section 1222 of the support 122 may be disposed between the step surface 1215 and the second end surface 1212, and the second section 1222 of the support 122 has a larger size in the circumferential direction than the first section 1221, and the second section 1222 of the unit length has a larger mass, so that when the second section 1222 of the support 122 is disposed between the step surface 1215 and the second end surface 1212, the center of gravity of the sealing pin 12 will be shifted toward the second section 1222, and when the mass of the second section 1222 is large enough, the center of the sealing pin 12 is located between the step surface 1215 and the second end surface 1212.

The center of gravity of the seal nail 12 is located between the step surface 1215 and the second end surface 1212, and in the process of pressing the seal nail 12 in, the seal nail 12 has a falling tendency and has a certain guiding effect, so that the seal nail 12 is not prone to the problem of askew nail, the seal nail 12 is conveniently pressed in the liquid injection hole 111, and the installation efficiency of the seal nail 12 is improved.

In some embodiments of the present application, the density of the support 122 is greater than the density of the body 121.

It will be appreciated that the sealing spike 12 provided with the support 122 has a greater mass than a conventional sealing spike 12 made of rubber for the same volume. Sealed nail 12 is at the in-process of installation, through leading the sealed nail 12 of nail pipe transport, under the same volume condition, improves the quality of sealed nail 12, can reduce sealed nail 12 and lead the phenomenon of the too big and bail of frictional force between the nail pipe, and the sealed nail 12 of being convenient for is installed to annotating liquid hole 111 from leading the nail pipe, has improved the installation effectiveness of sealed nail 12.

In another aspect, the present application provides a battery cell 10 including the end cap assembly 1 described above. Because the installation efficiency of the sealing nail 12 in the end cover component 1 is high, the single battery 10 has higher packaging efficiency, and the capacity of the single battery 10 is enlarged.

In yet another aspect, the present application provides a battery 100 including the battery cell 10 described above.

In yet another aspect, the present application provides an electric device including the battery 100 described above.

In some embodiments of the present application, as shown in fig. 3-13, the present application provides an end cap assembly 1 comprising an end cap 11 and a seal spike 12. The end cap 11 is provided with a liquid injection hole 111, and the sealing nail 12 is arranged at the liquid injection hole 111. Wherein, the seal nail 12 comprises a body 121 and a support 122, and the rigidity of the support 122 is greater than that of the body 121 to support the body 121. As shown in fig. 4 and 12, in the process of pressing the seal nail 12 into the liquid injection hole 111, the support 122 can reduce the deformation of the body 121 along the axial direction and the circumferential direction, and the deformation of the support 122 itself can be ignored, i.e., the deformation of the seal nail 12 is small, so that the problem that the seal nail 12 is flicked or inclined is not easy to occur, and the installation efficiency of the seal nail 12 is improved. As shown in fig. 5-8, the support 122 includes a first section 1221 and a second section 1222, the second section 1222 has a larger circumferential dimension than the first section 1221, and both ends of the support 122 are flush with the first end surface 1211 and the second end surface 1212 of the body 121, respectively. As shown in fig. 12 and 13, the outer circumferential surface of the body 121 includes a first surface 1213, a second surface 1214, and a step surface 1215. Wherein the first surface 1213 and the second surface 1214 are both conical surfaces, and the step surface 1215 is adapted to abut against the side of the end cap 11 facing away from the interior of the battery cell 10.

It should be noted that the features of the embodiments in the present application may be combined with each other without conflict.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An end cap assembly for a battery cell, comprising:

the end cover is provided with a liquid injection hole for injecting electrolyte into the battery cell;

the sealing nail is used for being installed at the liquid injection hole and comprises a body and a supporting piece embedded in the body, the axis of the supporting piece is overlapped with the axis of the body, and the rigidity of the supporting piece is greater than that of the body so as to be used for supporting the body;

and in a plane perpendicular to the axial direction of the liquid injection hole, the projection of the supporting piece is positioned in the projection of the liquid injection hole.

2. The end cap assembly according to claim 1, wherein the support member includes a first section and a second section connected in series along an axial direction thereof, the second section is closer to an inside of the battery cell than the first section, and a projection of the first section is located within a projection of the second section in a plane perpendicular to an axial direction of the liquid injection hole.

3. The end cap assembly according to claim 1 or 2, wherein the body has a first end face and a second end face which are oppositely arranged in the axial direction of the liquid inlet hole, and both ends of the support member are flush with the first end face and the second end face, respectively.

4. The end cap assembly according to claim 1 or 2, wherein the outer peripheral surface of the body includes a first surface, a second surface, and a step surface for connecting the first surface and the second surface, and the first surface and the second surface are each a conical surface that gradually decreases toward the inside of the battery cell in the axial direction of the liquid injection hole.

5. The end cap assembly of claim 4, wherein the first surface is configured to have an interference fit with an inner wall of the electrolyte injection hole, and the step surface is configured to abut against a side of the end cap facing the interior of the battery cell.

6. The end cap assembly according to claim 4, wherein the body has a first end face and a second end face that are disposed opposite to each other in the axial direction of the liquid inlet hole, the second end face is closer to the inside of the battery cell than the first end face, and the center of gravity of the seal nail is located between the step face and the second end face.

7. An end cap assembly according to claim 1 or 2, wherein the density of the support member is greater than the density of the body.

8. A battery cell comprising the end cap assembly of any one of claims 1-7.

9. A battery comprising the cell of claim 8.

10. An electrical device comprising a battery as claimed in claim 9 for providing electrical energy.