CN216015520U

CN216015520U - Battery monomer, battery and power consumption device

Info

Publication number: CN216015520U
Application number: CN202122353945.XU
Authority: CN
Inventors: 钟奇能; 燕苗苗; 李世达; 杨丽美; 吴译晨
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: 2022-03-11
Anticipated expiration: 2031-09-27

Abstract

The utility model relates to a new forms of energy technical field, concretely relates to battery monomer, battery and power consumption device, battery monomer includes: the battery cell assembly is arranged in the shell; one end of the shell is provided with an opening, and the inner wall of the shell is provided with a first connecting part; the end cover is arranged at the opening and provided with a connecting wall extending into the opening, a second connecting part is arranged at the position, opposite to the first connecting part, on the connecting wall, and the second connecting part is connected with the first connecting part. In this way, the utility model discloses can promote the stability of end cover and casing initial joint.

Description

Battery monomer, battery and power consumption device

Technical Field

The utility model relates to a new forms of energy technical field, concretely relates to battery monomer, battery and power consumption device.

Background

With the rapid development of new energy fields, the demand of power batteries is increasing day by day. In the production process of the power battery, after the end cover is positioned on the shell, the shell needs to be compressed tightly to enable pre-tightening force to be generated between the end cover and the shell, so that the stability of the positioning of the end cover on the shell is ensured, and then the end cover is preliminarily connected through pre-welding.

The inventor of the application finds in practice that due to the fact that interaction pretightening force exists between the end cover and the shell, and the stability of the pre-welding structure is poor, the end cover is prone to bouncing off, and welding air tightness fails.

SUMMERY OF THE UTILITY MODEL

In view of the above problem, the utility model provides a battery monomer, battery and power consumption device to can promote the stability of end cover and casing initial joint.

According to the utility model discloses an aspect of the embodiment provides a battery monomer, include: the battery cell assembly is arranged in the shell; one end of the shell is provided with an opening, and the inner wall of the shell is provided with a first connecting part; the end cover is arranged at the opening and provided with a connecting wall extending into the opening, a second connecting part is arranged at the position, opposite to the first connecting part, on the connecting wall, and the second connecting part is connected with the first connecting part.

The inner wall of the shell is provided with the first connecting portion, the end cover is provided with the connecting wall, the second connecting portion is arranged at the position, opposite to the first connecting portion, on the connecting wall, the first connecting portion is connected with the second connecting portion, the end cover is effectively limited and fixed in the axial direction, the situation that the end cover is bounced off due to the pretightening force of the shell acting on the end cover is avoided, the shell and the end cover are preliminarily and stably connected, good conditions are provided for subsequent welding, the pre-welding step in the battery assembling process is cancelled, the assembling efficiency between the shell and the end cover is effectively improved, and the battery capacity is fully improved.

In an alternative form, the maximum outer diameter of the connecting wall is greater than the inner diameter of the opening such that the connecting wall is an interference fit with the housing. Through setting up the biggest external diameter that connects the wall to be greater than the open-ended internal diameter for interference fit between connection wall and the casing is favorable to promoting stability and the leakproofness of being connected between end cover and casing, and because follow-up when welding end cover and casing, need exert the pretightning force in the casing side so that the welding seam satisfies the welding requirement between end cover and the casing, consequently can further avoid the problem of the end cover bullet that causes by the pretightning force to open through interference fit between connection wall and the casing.

In an optional mode, the first connecting portion includes a first clamping structure arranged on the inner wall of the housing, the second connecting portion includes a second clamping structure arranged on the connecting wall, and the first clamping structure and the second clamping structure are clamped. Through the mutual joint cooperation of first joint structure and second joint structure between casing and the end cover, realize the spacing fixed of end cover in the axial direction to be favorable to promoting the structural stability of end cover after the initial connection is fixed on the casing, provide good condition for subsequent welding.

In an alternative mode, the first clamping structure and the second clamping structure respectively comprise a first bump and a second bump which are clamped with each other. Through set up first lug and the second lug that connects to each other respectively with first joint structure and second joint structure, not only be favorable to guaranteeing the stability of end cover initial joint on the casing, provide good structural condition for follow-up welding, the end cover of still being convenient for is fixed with casing rapid Assembly, is favorable to reducing the assemble duration for the free production efficiency of battery.

In an optional mode, the first clamping structure and the second clamping structure respectively comprise a clamping block and a clamping groove which are clamped with each other. Through setting up first joint structure and second joint structure respectively to fixture block and the draw-in groove of mutual joint, be favorable to reducing the end cover and impress the structure interference between casing in-process first joint structure and the second joint structure to in the casing is impressed smoothly to the end cover of being convenient for, can also guarantee the firm of end cover and casing simultaneously and be connected.

In an alternative form, at least one of the first and second latch structures is provided with an inclined surface. Through set up the inclined plane on at least one in first joint structure or second joint structure, be favorable to improving the effort direction when the end cover is impressed in-process first lug and second lug relative movement to interaction force is crescent, does not take place the sudden change, consequently makes the operation of impressing of end cover lighter, and is convenient for control the volume of impressing of end cover.

In an optional mode, the number of the first clamping structures and the second clamping structures is multiple, and the multiple first clamping structures and the multiple second clamping structures are respectively and uniformly distributed along the circumferential direction of the inner wall and the connecting wall of the shell. The quantity through with first joint structure and second joint structure all sets up to a plurality ofly, and follows the inner wall of casing and connecting wall circumference evenly distributed respectively, makes stress distribution on first joint structure and the joint rear end cap of second joint structure joint and the casing even, is favorable to promoting the stability that end cover and casing are connected.

In an alternative form, the first and second catch formations are both annular. Through all being the annular setting with first joint structure and second joint structure, can guarantee between end cover and the casing all to form the joint along circumference each point, and then fully promote stability and the gas tightness of being connected between end cover and the casing.

In an optional mode, the first connecting portion includes a first damping connecting structure, the second connecting portion includes a second damping connecting structure, and the first damping connecting structure is connected with the second damping connecting structure in a matched mode. First connecting portion and second connecting portion include first damping connection structure and second damping connection structure respectively, are connected through first damping connection structure and second damping connection structure, provide certain resistance at the in-process of impressing of end cover on the one hand to avoid the end cover to cause the excessive condition of impressing owing to pressure is too big, on the other hand end cover is after the completion of impressing, and first damping connection structure and second damping structure cooperate to be connected, realize that the initial connection between end cover and the casing is fixed.

In an alternative mode, the first damping connection structure and the second damping connection structure respectively comprise a wave-shaped arc bulge and a wave-shaped arc recess. Divide into through first damping connection structure and second damping connection structure and set up to wave circular arc protruding and wave circular arc sunken, be favorable to promoting the leakproofness that end cover and casing are connected, realize simultaneously that the end cover is fixed with the initial joint of casing to at the end cover in-process of impressing provide certain resistance, avoid appearing impressing excessive condition.

In an alternative mode, the first damping connection structure and the second damping connection structure respectively comprise a wave-shaped triangular protrusion and a wave-shaped triangular depression. Divide into through first damping connection structure and second damping connection structure and set up to the protruding and wave triangle of wave triangle sunken, be favorable to promoting the leakproofness that end cover and casing are connected, realize simultaneously that the end cover is fixed with the initial joint of casing to at the end cover in-process of impressing provide certain resistance, avoid appearing impressing excessive condition.

According to another aspect of the embodiments of the present invention, there is provided a battery including the battery cell as described in any one of the above modes.

According to another aspect of the embodiments of the present invention, there is provided an electric device including the battery as described above.

The above description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented according to the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more obvious and understandable, the following detailed description of the present invention is given.

Drawings

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

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

fig. 2 is an exploded schematic view of a battery according to an embodiment of the present invention;

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

fig. 4 is a schematic diagram of an explosion structure of a battery cell according to another embodiment of the present invention;

fig. 5 is a schematic side view of an explosion of an end cap and a housing in a single battery according to an embodiment of the present invention;

fig. 6 is a schematic cross-sectional structural view of an end cap and a housing in a battery cell according to an embodiment of the present invention;

fig. 7 is a schematic cross-sectional structural view of an end cap and a housing in a battery cell according to another embodiment of the present invention;

fig. 8 is an exploded schematic view of an end cap and a housing in a battery cell according to an embodiment of the present invention;

fig. 9 is an exploded schematic view of an end cap and a housing in a battery cell according to another embodiment of the present invention;

fig. 10 is a schematic cross-sectional view of an end cap and a housing in a battery cell according to another embodiment of the present invention;

fig. 11 is a schematic cross-sectional structural view of an end cap and a housing in a battery cell according to another embodiment of the present invention.

The reference numbers in the detailed description are as follows:

a vehicle 1000;

battery 100, controller 200, motor 300;

a box 10, a first part 11, a second part 12;

the battery pack comprises a battery cell 20, an end cover 21, an electrode terminal 21a, a connecting wall 211, a shell 22, an opening 221, a core assembly 23, a pole ear 23a, a first connecting part 24, a first lug 241, a clamping block 242, a wave-shaped arc bulge 243, a wave-shaped triangular bulge 244, a second connecting part 25, a second lug 251, a clamping groove 252, a wave-shaped arc recess 253, a wave-shaped triangular recess 254 and an inclined surface 26.

Detailed Description

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

It should be noted that unless otherwise indicated, technical or scientific terms used in accordance with embodiments of the present invention shall have the ordinary meaning as understood by those skilled in the art to which embodiments of the present invention pertain.

In the description of the embodiments of the present invention, the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, which is only for convenience of description and simplification of the description, but does not indicate or imply that the device or element to which the reference is made must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the embodiments of the present invention.

Furthermore, the technical terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the embodiments of the present invention, "a plurality" means two or more unless specifically limited otherwise.

In the description of the embodiments of the present invention, unless explicitly specified or limited otherwise, the terms "mounted," "connected," and "fixed" are used in a broad sense, and may be, for example, 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 meaning of the above terms in the embodiments of the present invention can be understood by those skilled in the art according to specific situations.

In the description of the embodiments of the present invention, unless otherwise explicitly specified or limited, a first feature may be directly contacting a second feature or indirectly contacting the first and second features through intervening media. Furthermore, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely below the second feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

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.

In the production process of the battery, the end cover and the shell of the battery are generally fixed by laser welding, in order to ensure the air tightness of the connection between the end cover and the shell, after the end cover is positioned on the shell, a certain pretightening force is applied to the side wall of the shell to compress the end cover so as to ensure that the connection between the end cover and the shell meets the air tightness requirement and the welding seam requirement, part of points of the connection between the end cover and the shell are pre-welded in a spot welding mode, so that the end cover is primarily connected with the shell, and finally the end cover and the shell are completely welded by laser welding.

The inventor of the application notices that, after the end cover and the shell are preliminarily connected through the spot welding, because the structural stability of the spot welding connection is poor, and the pretightening force is applied to the end cover by the shell, the structure of the spot welding connection is damaged easily, and the end cover is extruded by the shell, so that the end cover is flicked, the welding air tightness is invalid, and the assembly fails.

Based on the above problem, the application provides a battery monomer, battery monomer includes the core subassembly, casing and end cover, the core subassembly sets up in the casing, the opening part of casing is located to the end cover lid, set up first connecting portion at shells inner wall, set up the second connecting portion on the connection wall of end cover, be connected through first connecting portion and second connecting portion and realize preliminary firm the being connected between casing and the end cover, the end cover condition of popping open is avoided appearing, the gas tightness that casing and end cover are connected is effectively guaranteed, and casing and end cover pass through first connecting portion and second connecting portion preliminary connection, can save the prewelding step through the spot welding mode, can directly weld between casing and the end cover through first connecting portion and second connecting portion preliminary connection, and then fully promote the assembly efficiency of battery, and improve the productivity.

The battery disclosed in the embodiment of the present application can be used in electric devices such as vehicles, ships or aircrafts, but not limited thereto. The power supply system who possesses this power consumption device of constitution such as battery monomer, battery that this application is disclosed can be used, like this, is favorable to alleviating and automatically regulated electric core bulging force worsens, and supplementary electrolyte consumes, promotes the stability and the battery life of battery performance.

The embodiment of the application provides an electric device using a battery as a power supply, wherein the electric device can be but is not limited to a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, a battery car, an electric automobile, a ship, a spacecraft and the like. The electric toy may include a stationary or mobile electric toy, such as a game machine, an electric car toy, an electric ship toy, an electric airplane toy, and the like, and the spacecraft may include an airplane, a rocket, a space shuttle, a spacecraft, and the like.

For convenience of description, the following embodiments take an example in which a power consuming apparatus according to an embodiment of the present application is a vehicle 1000.

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 a schematic diagram illustrating an exploded structure of a battery 100 according to some embodiments of the present disclosure. The battery 100 includes a case 10 and a battery cell 20, and the battery cell 20 is accommodated in the case 10. The case 10 is used to provide a receiving space for the battery cells 20, and the case 10 may have various structures. In some embodiments, the case 10 may include a first portion 11 and a second portion 12, the first portion 11 and the second portion 12 cover each other, and the first portion 11 and the second portion 12 together define a receiving space for receiving the battery cell 20. The second part 12 may be a hollow structure with one open end, the first part 11 may be a plate-shaped structure, and the first part 11 covers the open side of the second part 12, so that the first part 11 and the second part 12 jointly define a containing space; the first portion 11 and the second portion 12 may be both hollow structures with one side open, and the open side of the first portion 11 may cover the open side of the second portion 12. Of course, the case 10 formed by the first and second portions 11 and 12 may have various shapes, such as a cylinder, a rectangular parallelepiped, and the like.

In the battery 100, the number of the battery cells 20 may be multiple, and the multiple battery cells 20 may be connected in series or in parallel or in series-parallel, where in series-parallel refers to both series connection and parallel connection among the multiple battery cells 20. The plurality of battery cells 20 can be directly connected in series or in parallel or in series-parallel, and the whole formed by the plurality of battery cells 20 is accommodated in the box body 10; of course, the battery 100 may also be formed by connecting a plurality of battery cells 20 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 10. The battery 100 may further include other structures, for example, the battery 100 may further include a bus member for achieving electrical connection between the plurality of battery cells 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 schematic view of a battery cell 20 in a battery 100 according to some embodiments of the present disclosure. The battery cell 20 refers to the smallest unit constituting the battery. Referring to fig. 3, the battery cell 20 includes an end cap 21, a housing 22, a battery cell assembly 23, and other functional components.

The end cap 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 end cap 21 may be adapted to the shape of the housing 22 to fit the housing 22. Alternatively, the end cap 21 may be made of a material (e.g., an aluminum alloy) having a certain hardness and strength, so that the end cap 21 is not easily deformed when being impacted, and the battery cell 20 may have a higher structural strength and improved safety. The end cap 21 may be provided with functional components such as the electrode terminals 21 a. The electrode terminals 21a may be used to be electrically connected with the electric core assembly 23 for outputting or inputting electric power of the battery cells 20. In some embodiments, the end cap 21 may further include a pressure relief mechanism for relieving the internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold value. The material of the end cap 21 may also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not limited in this embodiment. In some embodiments, insulation may also be provided on the inside of the end cap 21, which may be used to isolate the electrical connection components within the housing 22 from the end cap 21 to reduce the risk of short circuits. Illustratively, the insulator may be plastic, rubber, or the like.

The housing 22 is an assembly for mating with the end cap 21 to form an internal environment of the battery cell 20, wherein the formed internal environment may be used to house the cell assembly 23, electrolyte, and other components. The housing 22 and the end cap 21 may be separate components, and an opening may be formed in the housing 22, and the opening may be covered by the end cap 21 to form the internal environment of the battery cell 20. Without limitation, the end cap 21 and the housing 22 may be integrated, and specifically, the end cap 21 and the housing 22 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 22, the end cap 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 housing 22 may be determined according to the specific shape and size of the electric core 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 cell assembly 23 is a component in the battery cell 20 where electrochemical reactions occur. One or more electrical core assemblies 23 may be contained within the housing 22. The core assembly 23 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 tabs having the active material constitute the main body portion of the core assembly, and the portions of the positive and negative electrode tabs having no active material each constitute the 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 and negative active materials react with the electrolyte, and the tab 23a is connected to the electrode terminal to form a current loop.

According to an aspect of an embodiment of the present application, a battery cell is provided, and referring to fig. 4, an explosion structure of the battery cell 20 according to an embodiment of the present application is shown. The battery cell 20 includes: end cap 21, housing 22 and electric core assembly 23. The electric core assembly 23 is disposed within the housing 22. One end of the housing 22 is provided with an opening 221, and the inner wall of the housing 22 is provided with a first connection portion 24. The end cover 21 is disposed at the opening 221, the end cover 21 has a connecting wall 211 extending into the opening 221, a second connecting portion 25 is disposed on the connecting wall 211 opposite to the first connecting portion 24, and the second connecting portion 25 is connected to the first connecting portion 24.

Specifically, as shown in fig. 4, the battery cell 20 may have a cylindrical structure as shown in the drawing, or may have a rectangular parallelepiped or polygonal cylindrical structure; the core assembly 23 may be formed by winding as shown in the drawing, or may be formed by stacking, which is not limited herein. The housing 22 is formed with an accommodating cavity therein, the cell assembly 23 is placed in the accommodating cavity in the housing 22 through the opening 221 on the housing 22, and the end cap 21 covers the opening 221 and is connected to the housing 22 in a sealing manner to isolate the accommodating cavity in the housing 22 from the external environment, so as to provide a charging and discharging environment for the cell assembly 23.

First connecting portion 24 and second connecting portion 25 can be two protruding joint structures of mutually supporting as shown in the figure, also can be protruding structure and the sunk structure of mutually supporting, through the joint realization preliminary firm between two protruding structures or between protruding structure and the sunk structure be connected between casing 22 and the end cover 21, provide good condition for follow-up welding. It is understood that in other embodiments, the first connecting portion 24 and the second connecting portion 25 may also be elastic damping structures respectively disposed on the inner wall of the housing 22 and the surface of the connecting wall 211, such as wave-shaped protrusions made of plastic material with certain elasticity, and the primary stable connection between the housing 22 and the end cover 21 is realized by the two wave-shaped protrusions being engaged and clamped.

It can be understood that, in order to ensure that the connecting wall 211 can be smoothly pressed into the opening 221 when the end cover 21 is connected to the housing 22, at least one of the first connecting portion 24 or the second connecting portion 25 needs to have good plasticity, so that in the process of pressing the connecting wall 211 into the opening 221, at least one of the first connecting portion 24 and the second connecting portion 25 generates elastic deformation when being pressed against each other, after the connecting wall 211 is completely pressed into the opening, the mutual pressing between the first connecting portion 24 and the second connecting portion 25 does not exist any more, and the elastic deformation is recovered, so that the first connecting portion 24 is connected to the second connecting portion 25, and the housing 22 is stably connected to the end cover 21. When pretightening force is subsequently applied to the shell 22 to reduce a weld between the shell 22 and the end cover 21, the end cover 21 is connected with the first connecting part 24 on the shell 22 through the second connecting part 25, so that the end cover 21 is effectively limited and fixed in the axial direction, and the situation that the end cover 21 is bounced off due to the pretightening force applied to the end cover 21 by the shell 22 is avoided.

Through set up first connecting portion 24 at the inner wall of casing 22, end cover 21 has connecting wall 211, the position relative with first connecting portion 24 on connecting wall 211 sets up second connecting portion 25, first connecting portion 24 is connected with second connecting portion 25, make end cover 21 obtain spacing effectively and fixed in the axial direction, thereby avoid the pretightning force that casing 22 was used in on end cover 21 to cause the condition that end cover 21 bounced open, realize the preliminary firm connection between casing 22 and the end cover 21, provide good condition for subsequent welding, and the prewelding step in the battery assembling process has been cancelled, assembly efficiency between casing 22 and the end cover 21 has effectively been promoted, fully promote the battery productivity.

Referring to fig. 5, a side view of the battery cell 20 according to an embodiment of the present disclosure is shown after the end cap 21 and the housing 22 are exploded. According to some embodiments of the present application, the maximum outer diameter d of the connecting wall 211₁Is larger than the inner diameter d of the opening 221₂So that the end cap 21 is an interference fit with the housing 22.

It should be noted that, in fig. 5, a dotted line in the case 22 indicates an inner wall of the case 22, in a production process of the battery cell 20, the case 22 and the end cap 21 are usually made of aluminum or an aluminum alloy, and in order to ensure that the connecting wall 211 can be smoothly pressed into the case 22 and is in interference fit with the case 22, the connecting wall 211 can be made of a hard plastic material with good plasticity, and is welded to the end cap 21 by hot melting or integral molding or is bonded to the end cap 21 by an adhesive, so that when the connecting wall 211 is pressed into the case 22 for assembly and connection, the connecting wall 211 is elastically deformed by the extrusion of the inner wall of the case 22, and after the deformation, an interaction force is generated between the connecting wall 211 and the inner wall of the case 22, which is beneficial to improving the stability and the sealing performance of connection between the end cap 21 and the case 22, and provides a good guarantee for subsequent welding.

It will be appreciated that the maximum outer diameter d of the connecting wall 211 is to be avoided₁The dimension d is generally set so that the press-fitting of the end cap 21 becomes difficult due to an excessive dimension, and the deformation of the end cap 21 or the housing 22 occurs after the press-fitting₁-d₂≤5mm。

By connecting the maximum outer diameter d of the wall 211₁Is set to be larger than the inner diameter d of the opening 221₂The interference fit between the connecting wall 211 and the housing 22 is favorable for improving the connection stability and the sealing performance between the end cover 21 and the housing 22, and because the pretightening force needs to be applied to the side surface of the housing 22 when the end cover 21 and the housing 22 are welded in the follow-up process, so that the welding line between the end cover 21 and the housing 22 meets the welding requirement, the problem that the end cover 21 is bounced off due to the pretightening force can be further avoided through the interference fit between the connecting wall 211 and the housing 22.

Referring to fig. 6, a cross-sectional structure of an end cap 21 and a housing 22 of a battery cell 20 according to an embodiment of the present disclosure is shown. According to some embodiments of the application, first connecting portion are including setting up in the first joint structure of shells inner wall, and the second connecting portion are including setting up the second joint structure on the connection wall, first joint structure and second joint structure joint.

Specifically, first joint structure and second joint structure joint can be protruding structure and protruding mutual joint between the structure, also can be protruding structure and the sunk structure joint each other, through the mutual joint cooperation of first joint structure and second joint structure between casing 22 and the end cover 21, realize the spacing of end cover 21 on the axial direction, the spacing of x direction is fixed promptly in figure 6, thereby be favorable to promoting the structural stability after end cover 21 is fixed in the preliminary connection on casing 22, provide good condition for subsequent welding.

With continued reference to fig. 6, according to some embodiments of the present disclosure, the first and second clamping structures respectively include a first bump 241 and a second bump 251, which are clamped to each other.

The first protrusion 241 is formed by protruding the inner wall of the housing 22, and it can be understood that the first protrusion 241 may be integrally formed with the housing 22 during a specific production process, so that the first protrusion 241 has high structural strength and stability.

Correspondingly, the second bump 251 is formed by the connection wall 211 protruding outward toward the surface of the inner wall of the housing 22, and in the specific production process, the second bump 251 and the connection wall 211 can be integrally formed, so that the second bump 251 also has good structural strength and stability, and the reliability of the clamping connection between the first bump 241 and the second bump 251 is further ensured.

Through set up first lug 241 and the second lug 251 that connects to each other respectively with first joint structure and second joint structure, not only be favorable to guaranteeing the stability of end cover 21 initial joint on casing 22, provide good structural condition for follow-up welding, it is fixed still to be convenient for end cover 21 and casing 22 rapid Assembly, is favorable to reducing the assemble duration for the free production efficiency of battery.

Referring to fig. 7, a cross-sectional structure of an end cap 21 and a housing 22 of a battery cell 20 according to another embodiment of the present disclosure is shown. According to some embodiments of the present application, the first and second snap structures include a latch 242 and a latch groove 252, respectively, that snap into each other.

As shown in fig. 7, the first latching structure may be a latch 242 disposed on an inner wall of the housing 22, and the second latching structure may be a latch 252 disposed on a surface of the connecting wall 211 facing the inner wall of the housing 22. The illustration is merely an example, and in other embodiments, the first latching structure may be a latching groove disposed on an inner wall of the housing 22, and the second latching structure may be a latching block disposed on a surface of the connecting wall 211.

Through setting up first joint structure and second joint structure respectively to fixture block 242 and the draw-in groove 252 of mutual joint, be favorable to reducing the end cover 21 and impress the structural interference between first joint structure of casing 22 in-process and the second joint structure to be convenient for during end cover 21 easily smoothly impresses casing 22, can also guarantee end cover 21 and casing 22's firm connection simultaneously.

Referring to fig. 6 and 7, according to some embodiments of the present disclosure, at least one of the first and second latch structures is provided with an inclined surface 26.

Specifically, as shown in fig. 6, when the first engaging structure and the second engaging structure are the first protrusion 241 and the second protrusion 251 respectively, and the inclined surface 26 is disposed on the second protrusion 251, the thickness of the second protrusion 251 at the inclined surface 26 gradually increases from bottom to top along the axial direction (i.e. the x direction in the drawing) so that, in the process of pressing the end cap 21 into the housing 22, the thinner portion of the inclined surface 26 contacts the first protrusion 241 first, and the thickness of the inclined surface 26 gradually increases along with the pressing of the end cap 21, so that the mutual acting force generated by the pressing between the first protrusion 241 and the second protrusion 251 is gradually increased, the connecting wall 211 is elastically deformed, and the mutual acting force gradually increases, so that the pressure can be gradually increased when the pressing operation is performed on the end cap 21, thereby facilitating the control of the pressing amount, avoiding the situation of over-pressing or under-pressing, and after the end cap 21 is pressed, the first bump 241 and the second bump 251 are not squeezed with each other, the deformation of the connecting wall 211 is recovered, and the first bump 241 and the second bump 251 are clamped.

As shown in fig. 7, when the first and second latch structures are the latch 242 and the latch 252, and when the inclined surface is provided on the latch 242, the thickness of the latch 242 at the inclined surface 26 is gradually increased from top to bottom in the axial direction (i.e., x direction in the drawing), and, similarly, in the process of pressing the end cap 21 into the housing 22, the thinner part of the inclined surface 26 contacts the connecting wall 211, and the thickness of the inclined surface 26 gradually increases with the pressing of the end cap 21, so that the latch 242 and the connecting wall 211 are pressed to generate an interaction force and gradually increase, the connecting wall 211 is elastically deformed, due to the increasing interaction force, the pressure may be increased gradually during the pressing operation of the end cap 21, thereby be convenient for control the volume of impressing, avoid causing the excessive or not enough condition of impressing, end cover 21 impresses the completion back, and the connecting wall 211 deformation resumes, makes fixture block 242 joint in draw-in groove 252.

The inclined surface 26 is arranged on at least one of the first clamping structure or the second clamping structure, so that the acting force direction when the first lug 241 and the second lug 251 move relatively in the pressing-in process of the end cover 21 is improved, the mutual acting force is gradually increased, and sudden change does not occur, so that the pressing-in operation of the end cover 21 is easier, and the pressing-in amount of the end cover 21 is convenient to control.

Referring to fig. 8, an exploded structure of the end cap 21 and the housing 22 of the battery cell 20 according to an embodiment of the present disclosure is shown. According to some embodiments of the present application, the number of the first clamping structure and the second clamping structure is plural, and the plural first clamping structures and the plural second clamping structures are respectively and uniformly distributed along the inner wall of the housing 22 and the circumferential direction of the connecting wall 211.

As shown in fig. 8, taking the first and second clamping structures as the first and

second protrusions

241 and 251, respectively, as an example, the number of the first and second clamping structures may be four, and the first and second clamping structures are uniformly arranged along the circumferential direction. It should be understood that the illustration in the drawings is merely an example, in other embodiments, the first clamping structure and the second clamping structure may also be a plurality of clamping blocks and clamping grooves, and the number of the clamping structures is a plurality of clamping blocks and clamping grooves that are uniformly distributed along the circumferential direction, and the specific number may be designed and adjusted according to the characteristics of the actual product, such as the size, the structure, and the material, and is not limited herein.

All set up to a plurality ofly through the quantity with first joint structure and second joint structure, and follow casing 22's inner wall and connecting wall 211 circumference evenly distributed respectively, make stress distribution on first joint structure and the joint of second joint structure joint rear end cap 21 and the casing 22 even, be favorable to promoting the stability that end cap 21 and casing 22 are connected.

Referring to fig. 9, an exploded structure of the end cap 21 and the housing 22 of the battery cell 20 according to another embodiment of the present disclosure is shown. According to some embodiments of the application, the first and second snap structures are both ring-shaped.

As shown in fig. 9, taking the first and second clamping structures as the first and

second protrusions

241 and 251, respectively, as an example, the first protrusion 241 is an annular protrusion structure circumferentially disposed on the inner wall of the housing 22, and the second protrusion 251 is an annular protrusion structure circumferentially disposed on the connecting wall 211.

Through all being the annular setting with first joint structure and second joint structure, can guarantee to all form the joint along circumference each point between end cover 21 and the casing 22, and then fully promote stability and the gas tightness of being connected between end cover 21 and the casing 22.

Referring to fig. 10, a cross-sectional structure of an end cap 21 and a housing 22 of a battery cell 20 according to an embodiment of the present disclosure is shown. The first connecting portion comprises a first damping connecting structure, the second connecting portion comprises a second damping connecting structure, and the first damping connecting structure is connected with the second damping connecting structure.

As shown in fig. 10, the first damping connection structure and the second damping connection structure may be, for example, wavy protrusions and depressions with certain elasticity, and during the pressing process of the end cover 21 into the housing 22, the first damping connection structure and the second damping connection structure slide relatively and deform elastically, so as to provide a certain reaction force to the end cover 21 during the pressing process, thereby being beneficial to avoiding the excessive pressing of the end cover 21 due to the excessive pressure applied to the end cover 21. It is understood that the illustration is merely exemplary, and in other embodiments of the present application, the first damping connection structure and the second damping connection structure may be two wavy elastic pieces, which slide and press each other to generate elastic deformation, thereby providing a certain resistance to the pressing of the end cap 21.

First connecting portion and second connecting portion include first damping connection structure and second damping connection structure respectively, are connected through first damping connection structure and second damping connection structure, provide certain resistance at end cover 21's the in-process of impressing on the one hand, in order to avoid end cover 21 to cause the excessive condition of impressing because pressure is too big, on the other hand end cover 21 is after the completion of impressing, first damping connection structure and second damping structure cooperation are connected, realize that the initial connection between end cover 21 and the casing 22 is fixed.

With continued reference to fig. 10, according to some embodiments of the present application, the first damping connection structure and the second damping connection structure include a wave-shaped circular arc protrusion 243 and a wave-shaped circular arc depression 253, respectively.

Specifically, the wave-shaped arc bulge 243 can be made of a plastic material with certain deformation capacity, in the process of pressing the end cover 21 into the shell 22, the connecting wall 211 and the wave-shaped arc bulge 243 slide to each other to generate extrusion, so that the wave-shaped arc bulge 243 is elastically deformed, certain resistance is provided for pressing the end cover 21 in, after the end cover 21 is pressed in, the wave-shaped arc bulge 243 is connected with the wave-shaped arc recess 253 on the connecting wall 211 in a matched mode, preliminary fixing of the end cover 21 on the shell 22 is achieved, meanwhile, the wave-shaped arc bulge 243 and the wave-shaped arc recess 253 are connected in a matched mode, the sealing effect of connection of the end cover 21 and the shell 22 is favorably improved, and the battery environment inside the shell 22 is guaranteed.

It should be understood that the illustration is merely an example, and in other embodiments, the connecting wall 211 may be provided with a wave-shaped arc recess, and the inner wall of the housing 22 may be provided with a wave-shaped arc protrusion, which will not be described herein again.

Through divide into first damping connection structure and second damping connection structure and set up to the protruding 243 of wave circular arc and wave circular arc recess 253, be favorable to promoting the leakproofness that end cover 21 and casing 22 are connected, realize simultaneously that end cover 21 and casing 22's preliminary connection are fixed to provide certain resistance at end cover 21 in-process of impressing, avoid appearing impressing excessive condition.

Referring to fig. 11, a cross-sectional structure of an end cap 21 and a housing 22 of a battery cell 20 according to another embodiment of the present disclosure is shown. According to some embodiments of the present application, the first damping connection structure and the second damping connection structure include a wave-shaped triangular protrusion and a wave-shaped triangular depression, respectively.

Specifically, the wave-shaped triangular protrusion 244 can be made of a plastic material with certain deformation capacity, in the process of pressing the end cover 21 into the shell 22, the connecting wall 211 and the wave-shaped triangular protrusion 244 slide to generate extrusion, so that the wave-shaped triangular protrusion 244 elastically deforms to provide certain resistance for pressing the end cover 21, after the end cover 21 is pressed, the wave-shaped triangular protrusion 244 is connected with the wave-shaped triangular recess 254 on the connecting wall 211 in a matched mode, the initial fixing of the end cover 21 on the shell 22 is achieved, meanwhile, the wave-shaped triangular protrusion 244 is connected with the wave-shaped triangular recess 254 in a matched mode, the sealing effect of connection of the end cover 21 and the shell 22 is improved, and the battery environment inside the shell 22 is guaranteed.

It is understood that the illustration is merely an example, and in other embodiments, the connecting wall 211 may be provided with a wave-shaped triangular recess, and the inner wall of the housing 22 may be provided with a wave-shaped triangular protrusion, which will not be described herein.

Through divide into first damping connection structure and second damping connection structure and set up to the protruding 244 of wave triangle and the sunken 254 of wave triangle, be favorable to promoting the leakproofness that end cover 21 and casing 22 are connected, realize simultaneously that end cover 21 and casing 22's preliminary connection are fixed to provide certain resistance at end cover 21 in-process of impressing, avoid appearing impressing excessive condition.

According to another aspect of the embodiments of the present application, there is also provided a battery including the battery cell 20 as in any one of the above embodiments.

Through setting up first connecting portion 24 at the casing 22 inner wall of battery monomer 20, end cover 21 has connecting wall 211, the position relative with first connecting portion 24 on connecting wall 211 sets up second connecting portion 25, first connecting portion 24 is connected with second connecting portion 25, make end cover 21 obtain spacing effectively and fixed in the axial direction, thereby avoid the pretightning force that casing 22 was used in on end cover 21 to cause the condition that end cover 21 bounced open, realize preliminary firm connection between casing 22 and the end cover 21, provide good condition for subsequent welding, and the prewelding step in the battery assembling process has been cancelled, effectively promoted the assembly efficiency between casing 22 and the end cover 21, fully promote the battery productivity.

According to another aspect of the embodiments of the present application, there is also provided an electric device including the battery as in the above embodiments.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled 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 substantially depart from the scope of the embodiments of the present invention, and are intended to be 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 invention is not limited to the particular embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, comprising: an electric core assembly, a shell and an end cover,

the electric core component is arranged in the shell;

an opening is formed in one end of the shell, and a first connecting part is arranged on the inner wall of the shell;

the end cover is arranged at the opening, the end cover is provided with a connecting wall extending into the opening, a second connecting part is arranged on the connecting wall at a position opposite to the first connecting part, and the second connecting part is connected with the first connecting part.

2. The battery cell as recited in claim 1 wherein the maximum outer diameter of the connecting wall is greater than the inner diameter of the opening such that the connecting wall is an interference fit with the housing.

3. The battery cell according to claim 1, wherein the first connection portion includes a first clamping structure disposed on an inner wall of the housing, the second connection portion includes a second clamping structure disposed on the connection wall, and the first clamping structure and the second clamping structure are clamped together.

4. The battery cell as recited in claim 3, wherein the first and second clamping structures comprise first and second protrusions that clamp against each other, respectively.

5. The battery cell according to claim 3, wherein the first clamping structure and the second clamping structure respectively comprise a clamping block and a clamping groove which are clamped with each other.

6. The battery cell as recited in claim 4 or 5, wherein at least one of the first and second clamping structures is provided with an inclined surface.

7. The battery cell according to any one of claims 4 to 6, wherein the number of the first clamping structures and the number of the second clamping structures are both multiple, and the multiple first clamping structures and the multiple second clamping structures are uniformly distributed along the inner wall of the housing and the circumferential direction of the connecting wall respectively.

8. The battery cell of any of claims 4-6, wherein the first snap fit structure and the second snap fit structure are both annular.

9. The battery cell as recited in claim 1 wherein the first connection portion comprises a first damped connection structure and the second connection portion comprises a second damped connection structure, the first damped connection structure being cooperatively connected with the second damped connection structure.

10. The battery cell as recited in claim 9 wherein the first and second damping connection structures comprise wave-shaped arc protrusions and wave-shaped arc depressions, respectively.

11. The battery cell as recited in claim 9 wherein the first and second damping connection structures comprise wave-shaped triangular protrusions and wave-shaped triangular depressions, respectively.

12. A battery comprising the battery cell of any one of claims 1-11.

13. An electric device comprising the battery as claimed in claim 12.