CN217158382U

CN217158382U - Battery cell, battery and power consumption device

Info

Publication number: CN217158382U
Application number: CN202220707059.4U
Authority: CN
Inventors: 裴桐
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2022-03-29
Filing date: 2022-03-29
Publication date: 2022-08-09
Anticipated expiration: 2032-03-29

Abstract

The application discloses battery monomer, battery and power consumption device. The battery cell includes: the shell is provided with a first opening along one end in a first direction, the shell is provided with a matching section along the circumferential direction of the first opening, the matching section forms an accommodating space and is accommodated in the accommodating space, the first end cover is connected with the matching section through a first connecting part, and the projection of the first end cover on the shell perpendicular to the first direction is overlapped with the matching section; the length of the first end cover along the second direction is a first size a, the length of the first end cover along the third direction is a second size b, the length of the accommodating space along the second direction is a third size c, the length of the accommodating space along the third direction is a fourth size d, the first size a is smaller than the third size c and/or the second size b is smaller than the fourth size d, and the first direction, the second direction and the third direction are perpendicular to each other. A gap is formed between the first end cover and the matching section, so that the probability of damage of the battery cells in the assembling process can be reduced.

Description

Battery cell, battery and power consumption device

Technical Field

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

Background

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

However, the conventional battery cell is vulnerable to damage during the assembly process.

SUMMERY OF THE UTILITY MODEL

In view of the above problems, the present application provides a battery cell, a battery and an electric device, which can alleviate the problem that the battery cell is easily damaged in the assembly process.

In a first aspect, the present application provides a battery cell, comprising: the shell is provided with a matching section along the circumferential direction of the first opening, the matching section forms an accommodating space and is accommodated in the accommodating space, the first end cover is connected with the matching section through a first connecting part, and the projection of the first end cover on the shell, which is perpendicular to the first direction, is superposed with the matching section; the length of the first end cover along the second direction is a first size a, the length of the first end cover along the third direction is a second size b, the length of the accommodating space along the second direction is a third size c, the length of the accommodating space along the third direction is a fourth size d, the first size a is smaller than the third size c and/or the second size b is smaller than the fourth size d, and the first direction, the second direction and the third direction are perpendicular to each other.

In the technical scheme of this application embodiment, because first end cover and cooperation section between have the clearance for when equipment first end cover and casing, the probability of contact between first end cover and the casing reduces, can reduce the impaired probability of battery monomer in the assembling process from this, thereby can promote the assembly goodness, and can reduce the assembly degree of difficulty because the existence in clearance.

In some embodiments, the first dimension a and the third dimension c satisfy: c-a is more than 0.07mm and less than or equal to 10 mm; and/or the second dimension b and the fourth dimension d satisfy: d-b is more than 0.07mm and less than or equal to 10 mm. Therefore, the probability of damage of the battery cells in the assembling process can be further reduced.

In some embodiments, the first dimension a and the third dimension c satisfy: c-a is more than 0.1mm and less than or equal to 6 mm; and/or the second dimension b and the fourth dimension d satisfy: d-b is less than or equal to 6mm and is more than 0.1 mm. Therefore, the probability of damage of the battery cell in the assembling process can be further reduced.

In some embodiments, the first end cap has first and second opposing sidewalls along the second direction, a gap being provided between the first and/or second sidewalls and the mating segment; and/or the first end cover is provided with a third side wall and a fourth side wall which are opposite to each other along the third direction, and a gap is arranged between the third side wall and/or the fourth side wall and the matching section. Through being provided with the clearance between the at least one lateral wall of first end cover week side and the cooperation section, and the difference of the lateral wall quantity of first end cover week side can have multiple different design selection, can select different designs according to actual demand from this.

In some embodiments, the fifth dimension e of the gap satisfies: e is more than 0.07mm and less than or equal to 5 mm. Therefore, the probability of damage of the battery cell in the assembling process can be further reduced.

In some embodiments, the fifth dimension e satisfies: e is more than 0.1mm and less than or equal to 3 mm. Therefore, the probability of damage of the battery cell in the assembling process can be further reduced.

In some embodiments, the first connecting portion protrudes from an inner wall of the first opening of the housing, and a projection of the first end cover and the first connecting portion along the first direction at least partially coincides; wherein the inner wall at the first opening of the housing forms the mating segment. The projection of the first end cover and the first connecting part along the first direction is at least partially overlapped, and the overlapped parts are connected with each other, namely the side wall of the first end cover is step-shaped, so that the possibility that laser leaks into the inside of the shell of the first end cover when the overlapped parts are welded by laser can be reduced.

In some embodiments, the mating segment protrudes inward to form a second connecting portion, the first connecting portion protrudes from a surface of the second connecting portion close to the first end cap, and a projection of the first connecting portion and the first end cap along the first direction at least partially coincide. Through the setting of second connecting portion to can reduce the cracked probability between first connecting portion and the casing, can promote single structural strength of battery from this.

In some embodiments, the first end cap has a protrusion with a first gap between the protrusion and the first connection portion, the sixth dimension f of the first gap satisfying: f is more than 0.07mm and less than or equal to 5 mm. Therefore, the probability of damage of the battery cell in the assembling process can be further reduced.

In some embodiments, the sixth dimension f satisfies: f is more than 0.1mm and less than or equal to 3 mm. Therefore, the probability of damage of the battery cell in the assembling process can be further reduced.

In some embodiments, a thickness g of the first connection portion in the first direction and the fifth dimension e satisfy: 0.05< g/e is less than or equal to 10. Therefore, the probability of damage of the battery cell in the assembling process can be further reduced.

In some embodiments, the thickness g and the fifth dimension e satisfy: 0.1< g/e < 3. Therefore, the probability of damage of the battery cell in the assembling process can be further reduced.

In some embodiments, an included angle between a surface of the first connecting portion connecting the first end cap and a surface of the second connecting portion connecting the first connecting portion is a right angle, an acute angle, or an obtuse angle. This can provide more production options.

In some embodiments, both surfaces of the first connection portion and the first end cap connected to each other are provided with a first land and a second land, respectively, which are opposite to each other. Therefore, the structural strength of the shell and the first end cover after connection can be improved.

In some embodiments, the battery cell may further include: the second end cover closes a second opening formed in the other end of the shell along the first direction, the electrode assembly is arranged in the shell, and two ends of the electrode assembly are connected with the first end cover and the second end cover respectively. When assembling the battery monomer, can connect first end cover and second end cover respectively in electrode subassembly's both ends earlier, and then wear to establish the through-hole with electrode subassembly wearing to advance from the second opening part, weld welding the welding region between first connecting portion and first end cover together at last can.

In a second aspect, the present application provides a battery comprising: the battery cell of any of the above. The quality of the battery can be improved by arranging the battery cells in the battery.

In a third aspect, the present application provides an electrical device comprising: a battery as described above. By providing the battery in the electric device, the mass of the electric device can be improved.

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

Drawings

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

FIG. 1 is a schematic structural diagram of a vehicle according to some embodiments of the present application;

FIG. 2 is an exploded view of a battery according to some embodiments of the present application;

fig. 3 is a schematic structural view of a battery cell according to some embodiments of the present application;

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

fig. 5 is a schematic structural view of one end of a battery cell according to some embodiments of the present application;

fig. 6 is a schematic view, partially in cross-section, of a battery cell according to some embodiments of the present application;

fig. 7 is a partially exploded cross-sectional view of a battery cell according to some embodiments of the present disclosure;

fig. 8 is a schematic view, partially in cross-section, of a housing of a battery cell of some embodiments of the present application;

fig. 9 is a schematic cross-sectional view of a first end cap of a battery cell according to some embodiments of the present application;

fig. 10 is a schematic view, partially in cross-section, of a battery cell according to further embodiments of the present application;

fig. 11 is a schematic partial cross-sectional view of a battery cell according to further embodiments of the present application.

The reference numbers in the detailed description are as follows:

1000-vehicle, 100-battery, 10-case, 11-first part, 12-second part, 200-controller, 300-motor;

20-cell, 21-housing, 211-first connection, 212-second connection, 21 a-first opening, 21 b-through hole, 21 c-second opening, 22-first end cap, 221-first side wall, 222-second side wall, 223-third side wall, 224-fourth side wall, 23-second end cap, 24-electrode assembly.

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: there are three cases of A, A and B, and B. In addition, the character "/" herein generally indicates that the former and latter associated 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 present inventors have noted that a battery cell, which is a minimum constituent unit of a battery, is provided with a case, one end of which in a first direction is provided with a first opening, and a first end cap, which closes the first opening. However, when the housing and the first end cover are assembled, the housing and the first end cover are easily scratched, so that the single battery is easily damaged in the assembling process.

In order to alleviate the problem that the battery cell is easily damaged in the assembling process, the applicant researches and discovers that the probability that the shell and the first end cover are contacted at the scraping position can be reduced, and therefore the probability that the battery cell is damaged in the assembling process can be reduced.

Based on the above consideration, in order to solve the problem that the single battery is easily damaged in the assembling process, through intensive research, the inventor designs a single battery by increasing the spacing distance between the first end cover and the housing at the scraping position, so as to reduce the probability of damage of the single battery in the assembling process.

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 embodiment will be described with reference to an electric device according to an embodiment of the present application as 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 to power the vehicle 1000, for example, the battery 100 may serve as an operating 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 not only serve as an operating power source of the vehicle 1000, but also serve as a driving power source of the vehicle 1000, instead of or in part of fuel or natural gas to provide driving power for the vehicle 1000.

Referring to fig. 2, fig. 2 is an exploded schematic view 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.

Here, the battery cell 20 refers to the smallest unit constituting the battery 100. 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.

According to some embodiments of the present application, referring to fig. 3, and with further reference to fig. 4-11, fig. 3 is a schematic structural view of a battery cell provided in some embodiments of the present application, fig. 4 is a schematic exploded structural view of a battery cell provided in some embodiments of the present application, fig. 5 is a schematic structural view of one end of a battery cell according to some embodiments of the present disclosure, fig. 6 is a schematic partial cross-sectional view of a battery cell according to some embodiments of the present disclosure, fig. 7 is a partially exploded cross-sectional view of a battery cell according to some embodiments of the present disclosure, fig. 8 is a partially exploded cross-sectional view of a housing of a battery cell according to some embodiments of the present disclosure, fig. 9 is a schematic cross-sectional view of a first end cap of a battery cell according to some embodiments of the present disclosure, fig. 10 is a schematic partial cross-sectional view of a battery cell according to yet other embodiments of the present disclosure, and fig. 11 is a schematic partial cross-sectional view of a battery cell according to yet other embodiments of the present disclosure. The battery cell 20 includes: the connector comprises a shell 21 and a first end cover 22, wherein one end of the shell 21 in a first direction is provided with a first opening 21a, the shell 21 is provided with a matching section in the circumferential direction of the first opening 21a, the matching section forms an accommodating space, the first end cover 22 is accommodated in the accommodating space, the first end cover 22 is connected with the matching section through a first connecting part 211, and the projection of the first end cover 22 perpendicular to the first direction on the shell 21 is overlapped with the matching section; the length of the first end cap 22 along the second direction is a first size a, the length along the third direction is a second size b, the length of the accommodating space along the second direction is a third size c, the length along the third direction is a fourth size d, the first size a is smaller than the third size c and/or the second size b is smaller than the fourth size d, and the first direction, the second direction and the third direction are perpendicular to each other.

The case 21 is an assembly for mating with the first end cap 22 to form an internal environment of the battery cell 20, wherein the formed internal environment may be used to house the electrode assembly 24, electrolyte, and other components. The housing 21 and the first end cap 22 may be separate components, and a receiving cavity having a first opening 21a may be provided on the housing 21, and the receiving cavity is closed by the first end cap 22 to form an internal environment of the battery cell 20. The housing 21 may be of various shapes and various sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism shape, and the like. Specifically, the shape of the case 21 may be determined according to the specific shape and size of the electrode assembly 24. The material of the housing 21 may be various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not limited in this embodiment.

The housing 21 is provided with a fitting section along the circumference of the first opening 21a, and the fitting section may be a circle of inner wall at the first opening 21a of the housing 21, or may be a structural member provided on a circle of inner wall at the first opening 21a of the housing 21, such as: hereinafter, the second connection portion 212 may also be a structural member provided on one of the inner walls of the ring at the first opening 21a of the housing 21 and another one of the inner walls of the ring provided at the first opening 21 a. The fitting section forms an accommodation space, which here means an opening communicating the space inside and outside the housing 21, which opening coincides with part or all of the first opening 21 a.

The first end cap 22 refers to a member that closes the first opening 21a of the case 21 to isolate the internal environment of the battery cell 20 from the external environment. The projection of the first end cap 22 onto the housing 21 perpendicular to the first direction coincides with the mating section, i.e. the thickness of the first end cap 22 in the first direction coincides with the dimension of the mating section in the first direction.

The electrode assembly 24 is a component in the battery cell 20 where electrochemical reactions occur. One or more electrode assemblies 24 may be contained within the case 21. The electrode assembly 24 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 body portion of the electrode assembly 24, and the portions of the positive and negative electrode tabs having no active material each constitute a tab. The positive electrode tab and the negative electrode tab may be located at one end of the main body portion together or at both ends of the main body portion, respectively. During the charge and discharge of the battery 100, the positive and negative active materials react with the electrolyte, and the tabs are coupled to the electrode terminals of the first cap 22 to form a current loop.

The length of the first end cap 22 along the second direction is a first size a, the length along the third direction is a second size b, the length of the accommodating space along the second direction is a third size c, the length along the third direction is a fourth size d, the first size a is smaller than the third size c and/or the second size b is smaller than the fourth size d, the first direction, the second direction and the third direction are perpendicular to each other, in other words, a gap is formed between the first end cap 22 and the matching section, or the volume of the first end cap 22 is smaller than the volume of the accommodating space.

In one embodiment, referring to fig. 3 to 11, a battery cell 20 includes: the electrode assembly comprises a shell 21, a first end cover 22 and an electrode assembly 24, wherein one end of the shell 21 along a first direction is provided with a first opening 21a, a circle of inner wall at the first opening 21a of the shell 21 is a matching section, the matching section forms an accommodating space, a circle of inner wall at the first opening 21a of the shell 21 protrudes to form a first connecting part 211, the first end cover 22 and the first connecting part 211 at least partially coincide along the projection of the first direction, and the electrode assembly 24 is arranged in the shell 21 and connected with an electrode terminal of the first end cover 22. When assembling: first, the first end cap 22 and the electrode assembly 24 are prepositioned; the material from which the case 21 is made is then wrapped around the outside of the first end cap 22 and the electrode assembly 24. Here, the overlapping portion of the first end cap 22 and the first connection portion 211 may be connected by welding or the like.

In this embodiment, since the gap is formed between the first end cap 22 and the matching section, when the first end cap 22 and the housing 21 are assembled, the probability of contact between the first end cap 22 and the housing 21 is reduced, so that the probability of damage to the battery cell 20 during the assembly process can be reduced, the assembly goodness can be improved, and the assembly difficulty can be reduced due to the gap.

According to some embodiments of the present application, optionally, with reference to fig. 5, the first dimension a and the third dimension c satisfy: c-a is more than 0.07mm and less than or equal to 10 mm; and/or the second dimension b and the fourth dimension d satisfy: d-b is less than or equal to 10mm and is more than 0.07 mm. This can further reduce the possibility of damage to the battery cell 20 during the assembly process.

According to some embodiments of the present application, optionally, with reference to fig. 5, the first dimension a and the third dimension c satisfy: c-a is more than 0.1mm and less than or equal to 6 mm; and/or the second dimension b and the fourth dimension d satisfy: d-b is less than or equal to 6mm and is more than 0.1 mm. Therefore, the possibility of damage to the battery cell 20 during the assembly process can be further reduced.

According to some embodiments of the present application, referring to fig. 6 to 11, the first end cap 22 has opposite first and

second sidewalls

221 and 222 along the second direction, a gap is provided between the first and/or

second sidewalls

221 and 222 and the mating segment; and/or the first end cap 22 has a third side wall 223 and a fourth side wall 224 which are opposite in the third direction, and a gap is provided between the third side wall 223 and/or the fourth side wall 224 and the matching section.

A gap is provided between the first side wall 221 and/or the second side wall 222 and the mating segment, that is, a gap is provided between at least one of the first side wall 221 and the second side wall 222 and the mating segment. When a gap is provided between the first sidewall 221 and the fitting section, the gap widths at two positions between the first sidewall 221 and the fitting section may be the same or different. Likewise, when a gap is provided between the second sidewall 222 and the mating segment, the width of the gap may be the same or different at two locations between the second sidewall 222 and the mating segment.

A gap is provided between the third sidewall 223 and/or the fourth sidewall 224 and the mating segment, that is, a gap is provided between at least one of the third sidewall 223 and the fourth sidewall 224 and the mating segment. When a gap is provided between the third sidewall 223 and the mating segment, the widths of the gap at two positions before the third sidewall 223 and the mating segment may be the same or different. Likewise, when a gap is provided between the fourth side wall 224 and the mating segment, the width of the gap may be the same or different between the fourth side wall 224 and the mating segment at two locations.

Exemplarily, referring to fig. 5, a gap is provided between the first sidewall 221 and the second sidewall 222, respectively, and the mating segment, and a gap is provided between the third sidewall 223 and the fourth sidewall 224, respectively, and the mating segment.

In this embodiment, a gap is provided between at least one side wall on the peripheral side of the first end cover 22 and the fitting section, and the number of the side walls on the peripheral side of the first end cover 22 can be varied to select different designs according to actual requirements.

According to some embodiments of the application, the fifth dimension e of the gap satisfies: e is more than 0.07mm and less than or equal to 5 mm. Here, the fifth dimension e of the gap is the distance between the outer wall of the first end cap 22 and the mating segment. This can further reduce the possibility of damage to the battery cell 20 during the assembly process.

According to some embodiments of the application, the fifth dimension e satisfies: e is more than 0.1mm and less than or equal to 3 mm. Therefore, the probability of damage to the battery cell 20 during the assembly process can be further reduced.

According to some embodiments of the present application, referring to fig. 6, the inner wall of the housing 21 at the first opening 21a is protruded with a first connection portion 211, and the first end cap 22 at least partially coincides with a projection of the first connection portion 211 along the first direction; wherein the inner wall of the housing 21 at the first opening 21a forms the mating section.

The projection of the first end cap 22 perpendicular to the first direction on the housing 21 coincides with the matching section, the inner wall of the first opening 21a of the housing 21 protrudes with a first connection portion 211, the projection of the first end cap 22 and the first connection portion 211 along the first direction at least partially coincides, that is, the surface of the peripheral side of the first end cap 22 along the first direction at least has a step surface having an included angle with the first direction, and the step surface can be connected with the first connection portion 211.

In this embodiment, the first end cap 22 and the first connecting portion 211 at least partially overlap each other in a projection along the first direction, that is, the side wall of the first end cap 22 is stepped, so that when the overlapping portions are welded by laser, the possibility of laser light leaking into the inside of the housing 21 inside the first end cap 22 can be reduced.

According to some embodiments of the present application, referring to fig. 7 to 11, the second connection portion 212 is formed by protruding the fitting section inward, the first connection portion 211 is disposed by protruding on a surface of the second connection portion 212 close to the first end cap 22, and a projection of the first connection portion 211 and the first end cap 22 at least partially overlap.

The end surface of the first connection portion 211 at the head end in the first direction may be flush with the end surface of the second connection portion 212 at the head end in the first direction as shown in fig. 7, and the first connection portion 211 may also be located at an intermediate position of the second connection portion 212 in the first direction, and may also be in other arrangements, which are not specifically limited herein. And the shape of the sidewall of the first end cap 22 may be changed to follow the shape defined by the first connection portion 211 and the second connection portion 212, which is not particularly limited herein.

In this embodiment, the second connection portion 212 is disposed, so that the probability of breakage between the first connection portion 211 and the housing 21 can be reduced, and the structural strength of the battery cell 20 can be improved.

According to some embodiments of the present application, referring to fig. 6, 10 and 11, the first end cap 22 has a convex portion, and a first gap is provided between the convex portion and the first connection portion 211, and a sixth dimension f of the first gap satisfies: f is more than 0.07mm and less than or equal to 5 mm. Here, the convex portion is located on a surface of the first end cap 22 facing away from the electrode assembly 24, and the convex portion is located in the receiving space formed by the first connection portion 211. This can further reduce the possibility of damage to the battery cell 20 during the assembly process.

According to some embodiments of the present application, referring to fig. 6, 10 and 11, the sixth dimension f satisfies: f is more than 0.1mm and less than or equal to 3 mm. This can further reduce the possibility of damage to the battery cell 20 during the assembly process.

According to some embodiments of the present disclosure, referring to fig. 6, 10 and 11, the thickness g and the fifth dimension e of the first connection portion 211 along the first direction satisfy: 0.05< g/e is less than or equal to 10. This can further reduce the possibility of damage to the battery cell 20 during the assembly process.

According to some embodiments of the present application, referring to fig. 7, 10 and 11, the thickness g and the fifth dimension e satisfy: 0.1< g/e < 3. Therefore, the possibility of damage to the battery cell 20 during the assembly process can be further reduced.

According to some embodiments of the present application, an angle between a surface of the first connection portion 211 connecting the first end cap 22 and a surface of the second connection portion 212 connecting the first connection portion 211 is a right angle, an acute angle, or an obtuse angle.

Such as: the included angle shown in fig. 7 to 10 is a right angle, and the included angle shown in fig. 11 is an obtuse angle of 120 degrees. This can provide more production options. And when the included angle is an obtuse angle, the strength of the first connecting portion 211 connecting with one end of the second connecting portion 212 can be enhanced, and the assembly with the first end cap 22 at the later stage is more convenient.

According to some embodiments of the present application, referring to fig. 6 to 11, both surfaces connected to each other between the first connection portion 211 and the first end cap 22 are provided with a first land and a second land, respectively, which are opposite to each other. Here, the first land and the second land may be connected together by penetration welding. This can improve the structural strength after the housing 21 and the first end cap 22 are connected.

According to some embodiments of the present application, referring to fig. 3 and 4, the battery cell 20 may further include: a second end cap 23 and an electrode assembly 24, the second end cap 23 closing a second opening 21c opened at the other end of the case 21 in the first direction, the electrode assembly 24 being disposed in the case 21, and both ends of the electrode assembly 24 being connected to the first end cap 22 and the second end cap 23, respectively.

Two openings at two ends of the through hole 21b of the housing 21 are a first opening 21a and a second opening 21c, respectively, and the first opening 21a and the second opening 21c are closed by a first end cover 22 and a second end cover 23, respectively, to form an internal environment of the battery cell 20.

In this embodiment, when assembling the battery cell 20, the first end cap 22 and the second end cap 23 can be connected to two ends of the electrode assembly 24, the electrode assembly 24 is inserted into the through hole 21b from the second opening 21c, and finally the welding areas of the first connecting portion 211 and the first end cap 22 are welded together.

According to some embodiments of the present application, referring to fig. 2, embodiments of the present application further provide a battery 100, the battery 100 including: the battery cell 20 of any of the above.

In this embodiment, the battery cell 20 is disposed in the battery 100, so that the quality of the battery 100 can be improved.

According to some embodiments of the present application, referring to fig. 1, embodiments of the present application further provide an electric device, including: the battery 100 of any of the above.

In this embodiment, the battery 100 is provided in the electric device, so that the mass of the electric device can be improved.

In one embodiment, referring to fig. 5 to 10, the battery cell 20 includes:

casing 21, casing 21 is provided with first opening 21a and second opening 21c respectively along the both ends of first direction, the protruding second connecting portion 212 that has of round inner wall of first opening 21a department, the terminal surface that casing 21 inner wall was kept away from to second connecting portion 212 is connected with first connecting portion 211, the thickness of second connecting portion 212 along first direction is greater than the thickness of first connecting portion 211 along first direction, and the terminal surface of second connecting portion 212 along first direction flushes with the terminal surface of first connecting portion 211 along first direction.

The first end cap 22, the thickness of the first end cap 22 in the first direction and the thickness of the second connection portion 212 in the first direction are the same. The peripheral side of the first end cap 22 includes a first sidewall 221, a fourth sidewall 224, a second sidewall 222, and a third sidewall 223 connected end to end in sequence, the first sidewall 221 is parallel to the second sidewall 222, and the third sidewall 223 is parallel to the fourth sidewall 224. The first end cover 22 is recessed with a step along a circle of edge of the head end of the first direction, two step surfaces forming the step are perpendicular, an included angle between the end surface of the tail end of the first connecting portion 211 along the first direction and the surface of the second connecting portion 212 departing from one side of the inner wall of the shell 21 and not provided with the first connecting portion 211 is a right angle, and the end surface of the tail end of the first connecting portion 211 along the first direction is welded with the step surface of the step in the first direction perpendicular to the first direction. A gap is formed between the surfaces of the first end cover 22 and the first connecting portion 211 departing from the second connecting portion 212 and between the surfaces of the first end cover 22 and the second connecting portion 212 departing from the inner wall side of the housing 21 and not connected with the first connecting portion 211, and a fifth dimension e of the gap satisfies: e is more than 0.07mm and less than or equal to 5 mm.

The second end cap 23, the second end cap 23 closes the second opening 21 c.

And an electrode assembly 24, the electrode assembly 24 being disposed in the case 21, and both ends of the electrode assembly 24 being connected to electrode terminals of the first and second end caps 22 and 23, respectively.

In another embodiment, referring to fig. 11, the battery cell 20 includes:

The first end cap 22, the thickness of the first end cap 22 in the first direction and the thickness of the second connection portion 212 in the first direction are the same. The peripheral side of the first end cap 22 includes a first sidewall 221, a fourth sidewall 224, a second sidewall 222, and a third sidewall 223 connected end to end in sequence, the first sidewall 221 is parallel to the second sidewall 222, and the third sidewall 223 is parallel to the fourth sidewall 224. The first end cover 22 is recessed with a step along a circle of edge of the head end of the first direction, an obtuse angle is formed between two step surfaces forming the step, an included angle between the end surface of the tail end of the first connecting portion 211 along the first direction and the surface of the second connecting portion 212 departing from one side of the inner wall of the shell 21 and not provided with the first connecting portion 211 is an obtuse angle, and the end surface of the tail end of the first connecting portion 211 along the first direction is welded with the step surface inclined in the first direction in the step. A gap is formed between the surfaces of the first end cover 22 and the first connecting portion 211 departing from the second connecting portion 212 and between the surfaces of the first end cover 22 and the second connecting portion 212 departing from the inner wall side of the housing 21 and not connected with the first connecting portion 211, and a fifth dimension e of the gap satisfies: e is more than 0.07mm and less than or equal to 5 mm.

The second end cap 23, the second end cap 23 closes the second opening 21 c.

In one of the above two embodiments, the side wall of the first end cap 22 is in clearance fit with the first connection portion 211 and the second connection portion 212, so that the positioning and assembling difficulty can be reduced; secondly, the step of the side wall of the first end cap 22 can be laser-welded with the first connecting portion 211, and the thickness of the corresponding connecting portion of the first end cap 22 is large so as to prevent light leakage during laser welding; third, the required precision of the connection position between the first connection portion 211 and the first end cap 22 is low, so that the assembly difficulty can be further reduced.

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.

Claims

1. A battery cell, comprising:

the shell is provided with a first opening along one end in a first direction, and a matching section is arranged on the shell along the circumferential direction of the first opening and forms an accommodating space;

the first end cover is accommodated in the accommodating space and is connected with the matching section through a first connecting part, and the projection of the first end cover on the shell, which is perpendicular to the first direction, is superposed with the matching section;

the length of the first end cover along the second direction is a first size a, the length of the first end cover along the third direction is a second size b, the length of the accommodating space along the second direction is a third size c, the length of the accommodating space along the third direction is a fourth size d, the first size a is smaller than the third size c and/or the second size b is smaller than the fourth size d, and the first direction, the second direction and the third direction are perpendicular to each other.

2. The battery cell of claim 1,

the first dimension a and the third dimension c satisfy: c-a is more than 0.07mm and less than or equal to 10 mm; and/or the presence of a gas in the gas,

the second dimension b and the fourth dimension d satisfy: d-b is less than or equal to 10mm and is more than 0.07 mm.

3. The battery cell of claim 2,

the first dimension a and the third dimension c satisfy: c-a is more than 0.1mm and less than or equal to 6 mm; and/or the presence of a gas in the gas,

the second dimension b and the fourth dimension d satisfy: d-b is less than or equal to 6mm and is more than 0.1 mm.

4. The battery cell of any of claims 1-3,

the first end cover is provided with a first side wall and a second side wall which are opposite to each other along the second direction, and a gap is arranged between the first side wall and/or the second side wall and the matching section; and/or the presence of a gas in the gas,

the first end cover is provided with a third side wall and a fourth side wall which are opposite to each other along the third direction, and a gap is formed between the third side wall and/or the fourth side wall and the matching section.

5. The battery cell of claim 4,

the fifth dimension e of the gap satisfies: e is more than 0.07mm and less than or equal to 5 mm.

6. The battery cell of claim 5,

the fifth dimension e satisfies: e is more than 0.1mm and less than or equal to 3 mm.

7. The battery cell of claim 1,

the first connecting part is protruded on the inner wall of the first opening of the shell, and the projection of the first end cover and the first connecting part along the first direction is at least partially overlapped;

wherein the inner wall at the first opening of the housing forms the mating segment.

8. The battery cell of claim 1,

the matching section protrudes inwards to form a second connecting part, the first connecting part is arranged on the surface, close to the first end cover, of the second connecting part in a protruding mode, and the projection of the first end cover and the first connecting part along the first direction is at least partially overlapped.

9. The battery cell according to claim 7 or 8,

the first end cover is provided with a convex part, a first gap is arranged between the convex part and the first connecting part, and a sixth size f of the first gap satisfies that: f is more than 0.07mm and less than or equal to 5 mm.

10. The battery cell of claim 9,

the sixth dimension f satisfies: f is more than 0.1mm and less than or equal to 3 mm.

11. The battery cell of claim 5,

the thickness g of the first connecting part along the first direction and the fifth dimension e meet: 0.05< g/e is less than or equal to 10.

12. The battery cell of claim 11,

the thickness g and the fifth dimension e satisfy: 0.1< g/e < 3.

13. The battery cell of claim 8,

the first connecting portion is connected the surface of first end cover with the second connecting portion is connected the contained angle between the surface of first connecting portion is right angle, acute angle or obtuse angle.

14. The battery cell according to claim 7 or 8,

two surfaces of the first connection portion and the first end cap connected to each other are provided with a first land and a second land, respectively, which are opposite to each other.

15. The battery cell of claim 1, further comprising:

the second end cover closes a second opening formed in the other end of the shell along the first direction;

and the electrode assembly is arranged in the shell, and two ends of the electrode assembly are respectively connected with the first end cover and the second end cover.

16. A battery, comprising:

the battery cell of any one of claims 1-15.

17. An electric device, comprising:

the battery of claim 16.