CN217158375U - Cover assembly, battery monomer, battery and power consumption device - Google Patents

Abstract

The application provides a lid subassembly, battery monomer, battery and power consumption device relates to battery technical field. The cap assembly includes a cap plate; the cover plate is provided with a first surface, the first surface is provided with a first groove, a first mounting hole for mounting the pole is formed in the bottom wall of the first groove, and the included angle between the side wall of the first groove and the bottom wall is an obtuse angle. The contained angle of the lateral wall of first recess and diapire is the obtuse angle and the lateral wall of first recess compares in the diapire for the inclined plane, can not or be difficult to produce the wire when stamping forming to can prevent to produce the wire or the wire that produces is few in the production process, after adopting the lid subassembly of this application embodiment to make battery monomer, near electrode subassembly or inside wire reduction or near electrode subassembly or inside no wire among the battery monomer.

Description

Cover assembly, battery monomer, battery and power consumption device

Technical Field

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

Background

The lithium ion battery has the advantages of high energy density, high average output voltage, quick charge and discharge, long service life, safety, reliability and the like, and the application field of the lithium ion battery is continuously expanded, so that the lithium ion battery is applied to the fields of electronic products, automobiles, electric vehicles, aerospace, micro-electro-mechanical and energy storage and the like.

The battery cell includes an electrode assembly and a case for receiving the electrode assembly, the case including a cap assembly, and wires may be generated during the manufacture and assembly of the battery cell, and the wires may cause short circuit of the battery cell and may cause fire explosion.

SUMMERY OF THE UTILITY MODEL

In view of the above problems, the present application provides a cap assembly, a battery cell, a battery and an electric device, which can reduce or even prevent a short circuit caused by a metal wire generated in the battery cell.

In a first aspect, embodiments of the present application provide a cap assembly, which includes a cap plate; the cover plate is provided with a first surface, the first surface is provided with a first groove, a first mounting hole for mounting the pole is formed in the bottom wall of the first groove, and the included angle between the side wall of the first groove and the bottom wall is an obtuse angle.

Among the technical scheme of this application embodiment, the lateral wall of first recess and the contained angle of diapire be the obtuse angle promptly the lateral wall of first recess compare for the inclined plane in the diapire, can not or be difficult to produce the wire when stamping forming to can prevent to produce the wire in the production process or the wire that produces is few, after adopting the lid subassembly of this application embodiment to make battery monomer, near electrode subassembly or inside wire reduction or near electrode subassembly or inside no wire among the battery monomer.

In some embodiments, the cover assembly further includes an insulator having opposing second and third faces, the second face facing the first face of the cover plate, the second face having a boss structure at least partially received in the first recess. When being in the same place insulator and apron cooperation, set up boss structure's at least part in first recess, insulator and apron realize preliminary relative positioning this moment, and it is fixed to be convenient for further location.

In some embodiments, the third surface has a second groove at a position corresponding to the boss structure, and a second mounting hole for mounting the pole is opened in a bottom wall of the second groove. When equipment lid subassembly or battery monomer, the part of utmost point post can hold in the second recess to the effect of utmost point post bottom surface is raised in the realization, reduces the occupation space of utmost point post at the inside cavity of battery monomer, improves the free energy density of battery.

In some embodiments, the minimum distance between the bottom wall of the second groove and the top surface of the boss structure is no greater than the depth of the first groove. In the lid subassembly of this application embodiment, after installing utmost point post, utmost point post more parts are located lid subassembly and lid subassembly upside to reduce the occupation of utmost point post to the free internal cavity of battery, improve the free energy density of battery.

After being in the same place insulator and apron cooperation, the diapire of first recess needn't laminate completely with the top surface of convex structure, can laminate completely, also can leave the cavity of take the altitude, as long as satisfy at least partial convex structure can hold in first recess.

In some embodiments, the boss structure is embedded in the first groove. When the insulating part and the cover plate are matched together, at least part of the boss structure is arranged in the first groove, and the insulating part and the cover plate are accurately and relatively positioned at the moment, so that other positioning structures can be omitted, or further positioning and fixing are facilitated.

In some embodiments, the first surface of the cover plate has a first positioning member, and the second surface of the insulating member has a second positioning member engaged with the first positioning member. When the insulating part and the cover plate are matched together, each first positioning part is matched with the corresponding second positioning part, and therefore the insulating part and the cover plate are accurately and relatively positioned.

In some embodiments, the first positioning member and the second positioning member are in plug-in fit. The mode of splicing fit can realize accurate relative positioning fast for insulating part and apron.

In some embodiments, one of the first positioning element and the second positioning element is a positioning column, and the other one is a positioning hole matched with the positioning column. When the insulating part and the cover plate are matched together, each positioning column is inserted into the corresponding positioning hole, so that the insulating part and the cover plate can be quickly positioned accurately and relatively.

In some embodiments, the cover assembly further includes a terminal post, the terminal post includes a base portion, a terminal post portion and a riveting portion, the base portion, the terminal post portion and the riveting portion are sequentially arranged along a height direction of the terminal post, the base portion is at least partially disposed in the second groove, the terminal post portion is disposed in the second mounting hole and the first mounting hole, and the riveting portion extends out of the first mounting hole. The part of base portion can hold in the second recess to the effect of utmost point post bottom surface is raised in the realization, reduces the occupation space of utmost point post at the inside cavity of battery monomer, improves the free energy density of battery.

In some embodiments, the height of the base portion protruding from the third surface of the insulator is 0.1mm to 0.3 mm. In the cap assembly of the embodiment of the present application, the height of the base portion protruding from the third surface of the insulating member cannot be too much or too little, so as to ensure connection of other structures in the battery cell.

In some embodiments, the cap assembly further includes a sealing member disposed on the pole portion, wherein one end of the sealing member abuts against the base portion and the other end abuts against the first surface of the cap plate. The sealing member can fill up the hole between partial pole portion and the apron for utmost point post sealing connection is in the apron, thereby after the battery monomer has been assembled, prevents that external impurity such as dust and moisture from entering into inside the battery pack.

In some embodiments, the first groove has a depth in the thickness direction of the cover plate of 0.5 × the thickness of the cover plate. In the lid subassembly of this application embodiment, first recess can not be too dark along apron thickness direction to guarantee that the free demand of battery is satisfied to the intensity of apron.

In some embodiments, the included angle between the side wall and the bottom wall of the first groove is between 100 ° and 160 °. In the lid subassembly of this application embodiment, through the contained angle of the lateral wall of control first recess and diapire, can reduce the wire that produces when stamping forming or prevent to produce the wire in the production process.

In a second aspect, the present application provides a battery cell, which includes a case, an electrode assembly and the above cap assembly, wherein the case is provided with a cavity having an opening at one end, the electrode assembly is disposed in the cavity, and the cap assembly covers the opening.

In a third aspect, the present application provides a battery including the above battery cell.

In a fourth aspect, the present application provides an electric device comprising the above battery for providing electric energy.

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 some embodiments of the present application;

fig. 2 is an exploded view of a battery provided in accordance with some embodiments of the present application;

fig. 3 is an exploded view of one of the battery cells shown in fig. 2;

FIG. 4 is an exploded view of the lid assembly of some embodiments of the present application;

FIG. 5 is a partial cross-sectional view of a cover plate of some embodiments of the present application;

FIG. 6 is a cross-sectional view of a cap assembly according to some embodiments of the present application;

FIG. 7 is a partial cross-sectional view of a cap assembly according to some embodiments of the present application;

fig. 8 is a schematic structural view of a post according to some embodiments of the present application.

Icon: 1000-a vehicle;

100-a battery; 200-a controller; 300-a motor;

10-a box body; 11-a first part; 12-a second part; 13-a containment space;

20-a battery cell; 21-a lid assembly; 21 a-pole; 22-a housing; 23-an electrode assembly; 23 a-a tab;

400-cover plate; 410-a first side; 420-a first groove; 421-bottom wall; 422-side wall; 430-a first mounting hole; 440-a first positioning member; 500-an insulator; 510-a second face; 520-a third face; 530-boss structure; 531-top surface; 540-a second recess; 550-a second mounting hole; 560-a second positioning element; 610-a base part; 620-pole section; 630-riveting; 700-sealing member.

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 implicitly indicating 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 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 of the application notices that poor voltage or short circuit sometimes occurs in a single battery, and after the single battery is disassembled, the inventor finds that metal wires exist in the single battery, even a part of the metal wires fall into an electrode assembly to puncture a diaphragm, so that the single battery has a large risk of short circuit, even a risk of fire and explosion.

The inventors have found that the wires within the battery cell originate primarily from the manufacture and assembly of the cap assembly, wherein the surface of the cap plate facing the interior of the battery cell has one or more grooves, the side walls of which are generally perpendicular to the bottom wall. When the groove is formed in a stamping forming mode, stamping is often needed for multiple times to meet the size requirement, in the second stamping process and the later stamping processes, a stamping head may be in contact with the side wall of the groove formed in the previous time, so that a metal wire is scraped, the metal wire is easy to remain in the groove, after the battery monomer is assembled, the metal wire in the groove may reach the vicinity or even the inside of an electrode assembly, poor voltage or a diaphragm is likely to be caused, even the battery monomer is caused to be short-circuited, and fire and explosion are likely to be caused seriously.

In order to alleviate the problem of having metal wires inside the battery cell, the applicant researches and discovers that the structure of the cover plate can be changed so that the metal wires are not or not easily generated in the stamping forming process.

In view of the above, the inventors have conducted extensive studies to design a cap assembly in which the angles of the side walls and the bottom wall of the groove are changed such that the included angle between the side walls and the bottom wall is an obtuse angle, and the side walls are inclined relative to the bottom wall, and this structure does not or hardly generate wires during press forming, thereby preventing generation of wires or very little generation of wires during the production process.

After the battery cell is manufactured by using the cap assembly, the number of wires near or inside the electrode assembly in the battery cell is reduced or no wires are near or inside the electrode assembly, thereby improving the safety and stability of the battery cell.

Reference to a battery in embodiments of the present application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. The battery generally includes a battery case for enclosing one or more battery cells, and the battery case prevents liquid or other foreign materials from affecting the charge or discharge of the battery cells.

The battery cell may include a lithium ion secondary battery cell, a lithium ion primary battery cell, a lithium sulfur battery cell, a sodium lithium ion battery cell, a sodium ion battery cell, or a magnesium ion battery cell, and the like, which is not limited in this application. The battery cell may be a cylinder, a flat body, a rectangular parallelepiped, or other shapes, which is not limited in the embodiments of the present application. The battery cells are generally divided into three types in an encapsulation manner: the battery pack comprises a cylindrical battery monomer, a square battery monomer and a soft package battery monomer.

The battery monomer comprises an electrode assembly and electrolyte, wherein the electrode assembly comprises a positive pole piece, a negative pole piece and an isolating membrane. The battery cell mainly depends on metal ions to move between the positive pole piece and the negative pole piece to work. The positive pole piece includes anodal mass flow body and anodal active substance layer, and anodal active substance layer coats in anodal mass flow body's surface, and the anodal mass flow body protrusion in the anodal mass flow body that has coated anodal active substance layer of uncoated anodal active substance layer, and the anodal mass flow body that does not coat anodal active substance layer is as anodal utmost point ear. Taking a lithium ion battery as an example, the material of the positive electrode current collector may be aluminum, and the positive electrode active material may be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate, or the like. The negative pole piece includes negative current collector and negative active material layer, and the negative active material layer coats in the surface of negative current collector, and the negative current collector protrusion in the negative current collector who has coated the negative active material layer of uncoated negative active material layer, the negative current collector who does not coat the negative active material layer makes negative pole utmost point ear. The material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon, silicon, or the like. In order to ensure that the fuse is not fused when a large current is passed, the number of the positive electrode tabs is multiple and the positive electrode tabs are stacked together, and the number of the negative electrode tabs is multiple and the negative electrode tabs are stacked together. The material of the isolation film may be polypropylene (PP) or Polyethylene (PE). In addition, the electrode assembly may have a winding structure or a lamination structure, and the embodiment of the present application is not limited thereto.

The single battery also comprises a current collecting component, wherein the current collecting component is used for electrically connecting the polar ear and the polar post of the single battery so as to transmit electric energy from the electrode component to the polar post and transmit the electric energy to the outside of the single battery through the polar post; the plurality of battery cells are electrically connected through the confluence part so as to realize series connection, parallel connection or series-parallel connection of the plurality of battery cells.

The battery also comprises a sampling terminal and a battery management system, wherein the sampling terminal is connected to the bus component and is used for collecting information of the battery cells, such as voltage or temperature. The sampling terminal transmits the acquired information of the single battery to the battery management system, and when the battery management system detects that the information of the single battery exceeds a normal range, the output power of the battery is limited so as to realize safety protection.

It is to be understood that the electric device using the battery described in the embodiments of the present application may be in various forms, for example, a mobile phone, a portable device, a notebook computer, a battery car, an electric car, a ship, a spacecraft, an electric toy, an electric tool, and the like, for example, a spacecraft including an airplane, a rocket, a space shuttle, a spacecraft, and the like, an electric toy including a stationary type or a mobile type electric toy, for example, a game machine, an electric car toy, an electric ship toy, an electric plane toy, and the like, an electric tool including a metal cutting electric tool, a grinding electric tool, an assembly electric tool, and a railway electric tool, for example, an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an electric impact drill, a concrete vibrator, and an electric planer.

The battery cell and the battery described in the embodiments of the present application are not limited to be applied to the above-described electric devices, but may be applied to all electric devices using the battery cell and the battery.

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 starting, 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.

Referring to fig. 2, fig. 2 is an exploded view of a battery 100 provided in some embodiments of the present application. The battery 100 may include a case 10 and a battery cell 20, the battery cell 20 being accommodated in the case 10. Wherein the case 10 is used for accommodating the battery cells 20, the case 10 may have various structures. In some embodiments, the case 10 may include a first portion 11 and a second portion 12, the first portion 11 and the second portion 12 cover each other, and the first portion 11 and the second portion 12 together define a receiving space 13 for receiving the battery cell 20. The second part 12 may be a hollow structure with one open end, the first part 11 is a plate-shaped structure, and the first part 11 covers the open side of the second part 12 to form the box 10 with the accommodating space 13; the first portion 11 and the second portion 12 may be hollow structures with one side open, and the open side of the first portion 11 covers the open side of the second portion 12 to form the box 10 with the accommodating space 13. Of course, the first portion 11 and the second portion 12 may be various shapes, such as a cylinder, a rectangular parallelepiped, and the like.

In the battery 100, one or more battery cells 20 may be provided. If there are a plurality of battery cells 20, the plurality of battery cells 20 may be connected in series, in parallel, or in series-parallel, where in series-parallel refers to that the plurality of battery cells 20 are connected in series or in parallel. The plurality of battery cells 20 may be directly connected in series or in parallel or in series-parallel, and the whole body formed by the plurality of battery cells 20 is accommodated in the case 10. Or a plurality of battery cells 20 may be connected in series or in parallel or in series-parallel to form a battery 100 module, and a plurality of battery 100 modules may be connected in series or in parallel or in series-parallel to form a whole and accommodated in the case 10. The battery 100 may further include other structures, for example, the plurality of battery cells 20 may be electrically connected by a bus member to realize parallel connection, series connection, or series-parallel connection of the plurality of battery cells 20.

Wherein each battery cell 20 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 20 may be cylindrical, flat, rectangular parallelepiped, or other shape.

Referring to fig. 3, fig. 3 is an exploded view of a battery cell 20 shown in fig. 2. The battery cell 20 refers to the smallest unit constituting the battery. The battery cell 20 includes a cap assembly 21, a case 22, an electrode assembly 23, and other functional components.

The cap assembly 21 refers to a member that covers an opening of the case 22 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the cap assembly 21 may be adapted to the shape of the case 22 to fit the case 22. Alternatively, the cap assembly 21 may be made of a material (e.g., an aluminum alloy) having certain hardness and strength, so that the cap assembly 21 is not easily deformed when being impacted by a compression, and thus the battery cell 20 may have higher structural strength and improved safety. The cap assembly 21 may be provided with a functional component such as a pole 21 a. The terminal post 21a may be used to electrically connect with the electrode assembly 23 for outputting or inputting electric power of the battery cell 20. In some embodiments, a pressure relief mechanism for relieving the internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold value may be further provided on the cap assembly 21. The material of the lid assembly 21 may be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present invention is not limited thereto. In some embodiments, an insulator may also be provided inside the cap assembly 21, which may be used to isolate the electrical connections within the housing 22 from the cap assembly 21 to reduce the risk of short circuits. Illustratively, the insulator may be plastic, rubber, or the like.

The case 22 is a component for cooperating with the cap assembly 21 to form an internal environment of the battery cell 20, wherein the formed internal environment may be used to house the electrode assembly 23, an electrolyte, and other components. The case 22 and the cap assembly 21 may be separate components, and an opening may be formed in the case 22, and the opening may be covered by the cap assembly 21 to form the internal environment of the battery cell 20. Without limitation, the cover assembly 21 and the housing 22 may be integrated, and specifically, the cover assembly 21 and the housing 22 may form a common connecting surface before other components are inserted into the housing, and when it is required to seal the interior of the housing 22, the cover assembly 21 covers the housing 22. The housing 22 may be a variety of shapes and sizes, such as rectangular parallelepiped, cylindrical, hexagonal prism, etc. Specifically, the shape of the case 22 may be determined according to the specific shape and size of the electrode assembly 23. The material of the housing 22 may be various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not limited in the embodiments of the present invention.

The electrode assembly 23 is a part in which electrochemical reactions occur in the battery cell 20. One or more electrode assemblies 23 may be contained within the case 22. The electrode assembly 23 is mainly formed by winding or stacking a positive electrode sheet and a negative electrode sheet, and a separator is generally disposed between the positive electrode sheet and the negative electrode sheet. The portions of the positive and negative electrode tabs having the active material constitute the body portions of the electrode assembly, and the portions of the positive and negative electrode tabs having no active material each constitute a tab 23 a. 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, the positive electrode active material and the negative electrode active material react with the electrolyte, and the tab 23a is connected with the pole to form a current loop.

Referring to fig. 4 and 5, fig. 4 is an exploded view of a lid assembly 21 according to some embodiments of the present application, and fig. 5 is a partial sectional view of a cover plate 400 according to some embodiments of the present application.

The present application provides a cap assembly 21 including a cap plate 400; the cover plate 400 has a first surface 410, the first surface 410 has a first groove 420, a first mounting hole 430 for mounting the terminal 21a is formed in a bottom wall 421 of the first groove 420, and an included angle between a side wall 422 of the first groove 420 and the bottom wall 421 is an obtuse angle.

The cap plate 400 is a member exposed to the outside to have a certain strength and to provide support to the cap assembly 21.

As an example, the cover plate 400 may be made of a metal material.

The first face 410 is a face of the cap plate 400 adjacent to or facing the electrode assembly after the battery cells are assembled.

Each first groove 420 corresponds to one pole 21a, and the first surface 410 of the cover plate 400 may have one or two first grooves 420. For a battery cell having only one cap assembly 21, the cap assembly 21 is used for corresponding to two terminals 21a, and the first surface 410 of the cap plate 400 has two first grooves 420; for a battery cell having two cover assemblies 21, for example, the two cover assemblies 21 are respectively covered at openings at two ends of the housing, each cover assembly 21 is used for corresponding to one terminal 21a, and at this time, the first surface 410 of each cover plate 400 has only one first groove 420.

The first mounting hole 430 is a through hole allowing the partial pole 21a to pass through and penetrate the bottom wall 421 of the first recess 420.

The bottom wall 421 of the first groove 420 is a plane for abutting against the pole 21a, and the side wall 422 of the first groove 420 may be entirely a plane or a curved surface, or a partial section is a plane and a partial section is a curved surface.

The obtuse angle between the sidewall 422 and the bottom wall 421 of the first groove 420 can be interpreted as following two cases according to whether the sidewall 422 is a plane or a curved surface:

1. as part or all of the side wall 422 of the plane

The bottom wall 421 and some or all of the side walls 422 are flat surfaces, and the included angle between the side wall 422 and the bottom wall 421 of the first groove 420 is an obtuse angle at this time, which means that the included angle between the two flat surfaces is an obtuse angle.

2. Part or all of the side wall 422 as a curved surface

The bottom wall 421 is a plane, and the side wall 422 is a curved surface, at this time, an included angle between the side wall 422 and the bottom wall 421 of the first groove 420 is an obtuse angle, which means that a cross section along the thickness direction of the cover plate 400 is formed, the side wall 422 forms a first straight line on the cross section, the bottom wall 421 forms a second straight line on the cross section, and the included angle between the first straight line and the second straight line is an obtuse angle.

The included angle between the side wall 422 of the first groove 420 and the bottom wall 421 is an obtuse angle, that is, the side wall 422 of the first groove 420 is an inclined plane compared with the bottom wall 421, and no or little metal wire is generated during punch forming, so that the generation of metal wire or the generation of metal wire in the production process can be prevented from being extremely small, and after the battery cell is manufactured by the cap assembly 21 of the embodiment of the application, the metal wire near or inside the electrode assembly in the battery cell is reduced or no metal wire is near or inside the electrode assembly.

Referring to fig. 4 and 6-7, optionally, in accordance with some embodiments of the present application, fig. 6 is a cross-sectional view of a lid assembly 21 in some embodiments of the present application, and fig. 7 is a partial cross-sectional view of the lid assembly 21 in some embodiments of the present application. The cap assembly 21 further includes an insulator 500, the insulator 500 having a second face 510 and a third face 520 opposite each other, the second face 510 facing the first face 410 of the cap plate 400, the second face 510 having a boss structure 530 at least partially received in the first recess 420.

The insulating member 500 is a member disposed between the cap plate 400 and the electrode assembly to prevent the cap plate 400 and the non-electrical connection portion of the electrode assembly from being electrically connected.

As an example, the insulating member 500 may be made of a polymer material.

The second face 510 is a face facing or abutting the first face 410, and the third face 520 is a face facing away from the first face 410 or toward the electrode assembly after the battery cell is assembled.

The boss structure 530 is a structure protruding from the second face 510 for mating with the first recess 420, and at least a portion of the boss structure 530 protruding from the second face 510 at the highest position can be entirely disposed in the first recess 420 after the insulation member 500 and the cover plate 400 are assembled. The shape of the boss structure 530 may be a cylinder, a prism, or other irregular shape, which is not limited in the embodiments of the present application.

After the insulating member 500 and the cover plate 400 are fitted together, the bottom wall 421 of the first groove 420 does not need to completely fit the top surface 531 of the boss structure 530, that is, the bottom wall 421 of the first groove 420 can completely fit the top surface 531 of the boss structure 530, or a cavity with a certain height can be left, as long as at least part of the boss structure 530 can be accommodated in the first groove 420.

When the insulating member 500 and the cover plate 400 are fitted together, at least a portion of the boss structure 530 is disposed in the first groove 420, and the insulating member 500 and the cover plate 400 are initially positioned relative to each other, so as to facilitate further positioning and fixing.

Optionally, the top surface 531 of the boss 530 abuts the bottom wall 421 of the first recess 420 after the cap assembly 21 is installed.

According to some embodiments of the present application, optionally, the third face 520 has a second groove 540 at a corresponding position of the boss structure 530, and a bottom wall 421 of the second groove 540 opens a second mounting hole 550 for mounting the pole 21 a.

The second mounting hole 550 is a through hole allowing the partial pole 21a to pass through and penetrate the bottom wall 421 of the second recess 540.

When equipment lid subassembly 21 or battery monomer, utmost point post 21 a's part can be held in second recess 540 to the effect of utmost point post 21a bottom surface is raised in the realization, reduces utmost point post 21a at the occupation space of the inside cavity of battery monomer, improves the free energy density of battery.

According to some embodiments of the present application, optionally, the minimum distance of the bottom wall of the second groove 540 from the top surface 531 of the boss structure 530 is no greater than the depth of the first groove 420.

The bottom wall of the second groove 540 is a plane for abutting against the pole 21 a.

The top surface 531 of the boss structure 530 is the surface proximate to the bottom wall 421 of the first recess 420.

And the minimum distance between the bottom wall of the second groove 540 and the top surface 531 of the boss structure 530 is the minimum thickness of the top of the boss structure 530 in the thickness direction of the cap assembly 21.

In the lid assembly 21 of this application embodiment, after installing utmost point post 21a, utmost point post 21a more parts are located lid assembly 21 and lid assembly 21 upside to reduce utmost point post 21a and to the occupation of the interior cavity of battery monomer, improve the free energy density of battery.

According to some embodiments of the present application, optionally, the boss structure 530 is embedded in the first groove 420.

The protrusion structure 530 is embedded in the first groove 420, that is, at least a portion of the sidewall 422 of the protrusion structure 530 is attached to the sidewall 422 of the first groove 420, and before other positioning elements are mounted, the protrusion structure 530 cannot move laterally relative to the first groove 420.

When the insulating member 500 and the cover plate 400 are fitted together, at least a portion of the boss structure 530 is disposed in the first groove 420, and the insulating member 500 and the cover plate 400 are precisely positioned relative to each other, so that other positioning structures can be omitted, or further positioning and fixing can be facilitated.

Alternatively, the portion of the boss structure 530 protruding from the uppermost position of the second face 510 may have the same shape as the first groove 420. The boss 530 and the first recess 420 are now fully engaged, i.e., the first recess 420 is just able to accommodate the portion of the boss 530 that protrudes above the uppermost portion of the second face 510.

Of course, in other embodiments of the present disclosure, the shape of the portion of the protruding structure 530 protruding from the highest position of the second surface 510 may be different from the shape of the first groove 420, as long as the first groove 420 can completely accommodate the portion of the protruding structure 530 protruding from the highest position of the second surface 510, and at this time, before the other positioning members are installed, the protruding structure 530 may be displaced laterally relative to the first groove 420.

According to some embodiments of the present application, optionally, the first side 410 of the cover plate 400 has a first positioning member 440, and the second side 510 of the insulating member 500 has a second positioning member 560 engaged with the first positioning member 440.

The first positioning member 440 and the second positioning member 560 are structures that are engaged with each other such that the cover plate 400 and the insulating member 500 cannot be displaced laterally relative to each other.

When the insulating member 500 and the cap plate 400 are coupled together, each first positioning member 440 is coupled to its corresponding second positioning member 560, so that the insulating member 500 and the cap plate 400 are precisely positioned relative to each other.

Of course, in other embodiments of the present application, when the boss structure 530 is embedded in the first groove 420, the cover plate 400 and the insulating member 500 are already simply positioned by the cooperation of the boss structure 530 and the first groove 420, and other positioning members may not be needed.

According to some embodiments of the present application, optionally, the first positioning member 440 and the second positioning member 560 are in a plug-fit.

The manner of the insertion fit enables the insulator 500 and the cover plate 400 to be quickly positioned in a precise manner relative to each other.

According to some embodiments of the present application, optionally, one of the first positioning element 440 and the second positioning element 560 is a positioning column, and the other one is a positioning hole matched with the positioning column.

For example, the first positioning member 440 may be a positioning hole, and the second positioning member 560 may be a positioning column, or the first positioning member 440 may be a positioning column, and the second positioning member 560 may be a positioning hole.

The positioning column is a columnar structure protruding from the first surface 410 and matched with the positioning hole in shape. The positioning columns may be cylindrical, prismatic or other irregular shapes, which is not limited in the embodiments of the present application.

The positioning hole is a blind hole disposed on the second surface 510 and matched with the positioning column in shape. The positioning hole may be cylindrical, prismatic or other irregular shapes, which is not limited by the embodiments of the present application.

When the insulating member 500 and the cover plate 400 are fitted together, each positioning column is inserted into the corresponding positioning hole, so that the insulating member 500 and the cover plate 400 are quickly positioned in a precise manner.

According to some embodiments of the present application, please refer to fig. 4, 6 to 8 optionally, and fig. 8 is a schematic structural diagram of the pole 21a according to some embodiments of the present application. The cover assembly 21 further includes a pole 21a, the pole 21a includes a base portion 610, a pole portion 620 and a riveting portion 630 sequentially arranged along a height direction thereof, the base portion 610 is at least partially disposed in the second recess 540, the pole portion 620 is disposed in the second mounting hole 550 and the first mounting hole 430, and the riveting portion 630 protrudes out of the first mounting hole 430.

The base portion 610 is a structure for electrical connection with the tab, which cannot pass through the second mounting hole 550, but abuts with its top surface 531 against the bottom wall 421 of the second groove 540.

The caulking portion 630 is configured such that the pole 21a protrudes from the first mounting hole 430 and protrudes from the first surface 410, and can be connected to other components.

The pole part 620 is a structure connecting the base part 610 and the rivet part 630, and is disposed in the second mounting hole 550 and the first mounting hole 430 in the thickness direction of the cap assembly 21.

The part of base portion 610 can be held in second recess 540 to the effect of pole 21a bottom surface is raised in the realization, reduces the occupation space of pole 21a at the free internal cavity of battery, improves the free energy density of battery.

According to some embodiments of the present disclosure, the height of the base portion 610 protruding from the third surface 520 of the insulator 500 is optionally 0.1mm to 0.3 mm.

As an example, the height at which the base portion 610 protrudes from the third face 520 of the insulator 500 may be 0.1mm, 0.2mm, or 0.3 mm.

In the cap assembly 21 according to the embodiment of the present application, the height of the base portion 610 protruding from the third surface 520 of the insulating member 500 cannot be too large or too small to ensure connection of other structures in the battery cell.

According to some embodiments of the present application, optionally, the cap assembly 21 further includes a sealing member 700, the sealing member 700 is disposed on the pole portion 620, and one end of the sealing member 700 abuts against the base portion 610 and the other end abuts against the first surface 410 of the cap plate 400.

The sealing member 700 is a member for preventing foreign substances such as dust and moisture from entering the inside of the battery cell from the junction surface between the pole part 620 and the cap plate 400 and the insulating member 500.

Optionally, the seal 700 is a rubber seal.

The sealing member 700 can fill up the gap between part of the post part 620 and the cap plate 400, so that the post 21a is hermetically coupled to the cap plate 400, thereby preventing external impurities, such as dust and moisture, from entering the inside of the battery assembly after the battery cell is assembled.

According to some embodiments of the present application, optionally, the depth D of the first groove 420 in the thickness direction of the cover plate 400 is ≦ 0.5 × the thickness H of the cover plate 400.

In the cap assembly 21 of the embodiment of the present application, the first groove 420 cannot be too deep in the thickness direction of the cap plate 400 to ensure the strength of the cap plate 400 to meet the requirements of the battery cell.

According to some embodiments of the present application, the included angle between the sidewall 422 and the bottom wall 421 of the first groove 420 is optionally 100 ° to 160 °.

As an example, the included angle of the side wall 422 and the bottom wall 421 of the first groove 420 may be 100 °, 110 °, 120 °, 130 °, 135 °, 140 °, 150 °, or 160 °.

It should be noted that the included angle between the sidewall 422 and the bottom wall 421 of the first groove 420 of different segments may be the same or different.

In the cap assembly 21 according to the embodiment of the present application, by controlling the included angle between the side wall 422 and the bottom wall 421 of the first groove 420, the wire generated during the punch forming can be reduced or the wire generated during the production process can be prevented.

Referring to fig. 4-8, according to some embodiments of the present application, a lid assembly 21 is provided, which includes a lid plate 400, an insulator 500, a post 21a, and a sealing member 700. The cover 400 has a first surface 410, the first surface 410 has a first groove 420, the depth D of the first groove 420 along the thickness direction of the cover 400 is 0.5 × the thickness H of the cover 400, the bottom 421 of the first groove 420 is opened with a first mounting hole 430 for mounting the post 21a, and the included angle between the sidewall 422 and the bottom wall 421 of the first groove 420 is 135 deg., the insulating member 500 has a second face 510 and a third face 520 opposite to each other, the second face 510 faces the first face 410 of the cap plate 400, the second face 510 has a boss structure 530 at least partially embedded in the first groove 420, the top surface 531 of the protruding structure 530 abuts against the bottom surface of the first groove 420, the third surface 520 has a second groove 540 at a corresponding position of the protruding structure 530, the bottom wall 421 of the second groove 540 is provided with a second mounting hole 550 for mounting the terminal post 21a, the first surface 410 of the cover 400 has a positioning hole, and the second surface 510 of the insulating member 500 has a second positioning post matched with the positioning post. The pole 21a includes a base portion 610, a pole portion 620 and a riveting portion 630 sequentially arranged along the height direction thereof, the base portion 610 is at least partially disposed in the second groove 540, the pole portion 620 is disposed in the second mounting hole 550 and the first mounting hole 430, the riveting portion 630 extends out of the first mounting hole 430, and the height of the base portion 610 protruding out of the third surface 520 of the insulator 500 is 0.2 mm. The sealing member 700 is disposed around the pole portion 620, one end of the sealing member 700 abuts against the base portion 610, and the other end abuts against the first surface 410 of the cap 400.

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; such modifications and substitutions do not depart from the spirit and scope of the present disclosure, and the present disclosure should be construed as being covered by the claims and the specification. 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.

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 (16)

1. A cap assembly, comprising:

the utility model provides a pole mounting structure, including apron, first face has first recess, the first mounting hole of installation utmost point post is seted up to the diapire of first recess, just the lateral wall of first recess and the contained angle of diapire are the obtuse angle.

2. The cover assembly of claim 1, further comprising an insulator having opposing second and third faces, the second face facing the first face of the cover plate, the second face having a boss structure at least partially received in the first recess.

3. The cover assembly according to claim 2, wherein the third surface has a second groove at a position corresponding to the boss structure, and a second mounting hole for mounting the pole is opened in a bottom wall of the second groove.

4. The cap assembly of claim 3, wherein a minimum distance between a bottom wall of the second groove and a top surface of the boss structure is no greater than a depth of the first groove.

5. The cap assembly of claim 4, wherein the boss structure is embedded in the first groove.

6. The cap assembly of claim 4 or 5, wherein the first face of the cap plate has a first positioning member, and the second face of the insulating member has a second positioning member engaged with the first positioning member.

7. The cover assembly of claim 6, wherein the first and second locating members are a snap fit.

8. The lid assembly of claim 7, wherein one of the first positioning member and the second positioning member is a positioning post, and the other one of the first positioning member and the second positioning member is a positioning hole engaged with the positioning post.

9. The cover assembly of claim 3, further comprising a post, wherein the post comprises a base portion, a post portion and a rivet portion sequentially arranged along a height direction of the post, the base portion is at least partially disposed in the second groove, the post portion is disposed in the second mounting hole and the first mounting hole, and the rivet portion protrudes out of the first mounting hole.

10. The cap assembly of claim 9, wherein the height at which the base portion protrudes from the third face of the insulator is 0.1mm to 0.3 mm.

11. The cover assembly of claim 9, further comprising a sealing member disposed around the pole portion, wherein one end of the sealing member abuts against the base portion and the other end abuts against the first surface of the cover plate.

12. The cover assembly of claim 1, wherein the first groove has a depth of 0.5 x or less in the thickness direction of the cover plate.

13. The cap assembly of claim 1, wherein the included angle between the sidewall and the bottom wall of the first groove is 100 ° to 160 °.

14. A battery cell, comprising:

the shell is provided with a cavity with one open end;

an electrode assembly disposed in the cavity;

the cover assembly of any one of claims 1 to 13, covering the opening.

15. A battery comprising the cell of claim 14.

16. An electric device, characterized in that the electric device comprises a battery according to claim 15 for providing electric energy.

Images