CN217768649U

CN217768649U - Battery cell shell, battery cell, battery and power consumption device

Info

Publication number: CN217768649U
Application number: CN202222131763.2U
Authority: CN
Inventors: 刘迪
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2022-08-15
Filing date: 2022-08-15
Publication date: 2022-11-08
Anticipated expiration: 2032-08-15

Abstract

The application relates to a battery monomer shell, battery monomer, battery and power consumption device, battery monomer shell includes: a main housing having an accommodation chamber with an opening at one end; the end cover comprises a first end cover sheet and a second end cover sheet, wherein the first end cover sheet and the second end cover sheet are stacked along a first direction, and the edge of the first end cover sheet protrudes outwards relative to the side wall of the second end cover sheet along a direction perpendicular to the first direction so as to form a lap joint part which surrounds the second end cover sheet along the circumferential direction; the second end cover plate is positioned in the accommodating cavity, one side surface of the lap joint part close to the second end cover plate is supported on the end wall of the opening end of the accommodating cavity, and a welding seam is formed at the joint of the end cover and the main shell body so as to be fixedly connected with each other. Because adopt first end flap and the range upon range of formation end cover of second end flap, consequently can process first end flap and second end flap respectively, and because first end flap and second end flap all are sheet structure, consequently processing technology is simple, and the machining precision is higher.

Description

Battery cell shell, battery cell, battery and power consumption device

Technical Field

The application relates to the technical field of batteries, in particular to a battery monomer shell, 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 the electric vehicle becomes an important component of the sustainable development of the automobile industry due to the advantages of energy conservation and environmental protection. For electric vehicles, battery technology is an important factor in its development.

The battery cell generally includes a housing and a battery cell accommodated in the housing, the housing includes a main housing with an opening at one end and an end cap for closing the opening end, a flange structure is formed at the edge of the end cap to connect with the main housing, and the end cap is generally manufactured by a punch forming method. However, when the housing is made of a material having high hardness (e.g., steel), the end cap manufactured by press-forming is difficult to meet the precision requirement, thereby reducing the assembly yield of the battery and increasing the production cost.

SUMMERY OF THE UTILITY MODEL

In view of the above problems, the present application provides a battery cell case, a battery cell, a battery, and an electric device, which can satisfy the accuracy requirement even when the material hardness is large.

In a first aspect, the present application provides a battery cell housing, comprising:

a main housing including an accommodation chamber and an opening;

the end cover is used for covering the opening and comprises a first end cover sheet and a second end cover sheet, the first end cover sheet and the second end cover sheet are arranged in a stacking mode along a first direction, and the first end cover sheet protrudes outwards relative to the side wall of the second end cover sheet along a direction perpendicular to the first direction so as to form a lap joint part extending along at least part of the edge of the second end cover sheet;

the second end flap is positioned within the receiving cavity, and a side surface of the bridge adjacent the second end flap is configured to abut an end wall surrounding the opening.

In the technical scheme of this application embodiment, owing to adopt first end cap piece and the range upon range of formation end cover of second end cap piece, consequently can process first end cap piece and second end cap piece respectively, and because first end cap piece and second end cap piece all are sheet structure, consequently processing technology is simple, and the machining precision is higher, and the manufacturability of the apex angle of first end cap piece and second end cap piece is higher, has less tolerance, has avoided the restriction of stamping forming technology to the end cover structure.

In one embodiment, the end cover is welded with the main shell and forms a welding seam, and the height of the welding seam protruding out of the outer side wall of the main shell is less than 0.1mm. Because the end cover and the main shell can be welded in different welding directions, a proper welding direction can be selected according to the battery cores with different sizes, and the terminal cover and the main shell have high equipment compatibility. Moreover, the height of the welding seam protruding out of the outer side wall of the main shell is less than 0.1mm, so that the whole volume of the battery is not increased basically while the accommodating cavity is closed, and the application range of the battery is expanded.

In one embodiment, at least one of the first end cap piece and the second end cap piece is provided with at least one lightening hole. The weight of the end cover is reduced by the lightening holes, and meanwhile, the material consumption of the end cover is reduced, so that the manufacturing cost of the battery is reduced.

In one embodiment, one of the first end cover plate and the second end cover plate is provided with a pressure relief mechanism mounting hole, the other one of the first end cover plate and the second end cover plate is provided with a lightening hole correspondingly communicated with the pressure relief mechanism mounting hole, and the orthographic projection of the edge of the pressure relief mechanism mounting hole on the surface provided with the lightening hole is positioned outside the edge of the pressure relief mechanism mounting hole.

Because the orthographic projection of the edge of the pressure relief mechanism mounting hole on the surface provided with the lightening hole is positioned outside the edge of the pressure relief mechanism mounting hole, the pressure relief mechanism mounting hole can be completely exposed on one side of the lightening hole, so that the situation that the first end cover plate or the second end cover plate which is not provided with the pressure relief mechanism mounting hole shields the pressure relief mechanism mounting hole to influence the mounting of the pressure relief mechanism mounting hole is avoided.

In one embodiment, one of the first or second end flaps is in the shape of a closed loop. Therefore, the first end cover plate or the second end cover plate is simplified into the annular structure, the weight of the end cover is effectively reduced, material consumption is reduced, a plurality of lightening holes do not need to be formed, and the manufacturing process of the end cover is further simplified.

In one embodiment, the first end flap comprises a first sub end flap and a second sub end flap, the first sub end flap and the second sub end flap being parallel and spaced apart on opposite sides of the second end flap in either direction perpendicular to the first direction.

Therefore, the first end cover plate structure is simplified into two strip-shaped sheet structures, the weight of the end cover is effectively reduced, material consumption is reduced, lightening holes do not need to be formed, and the manufacturing process of the end cover is further simplified.

In one embodiment, the second end flap comprises a third sub end flap and a fourth sub end flap, the third sub end flap and the fourth sub end flap being parallel and spaced apart on opposite sides of the first end flap in either direction perpendicular to the first direction.

Therefore, the second end cover plate is simplified into two strip-shaped sheet structures, the weight of the end cover is effectively reduced, material consumption is reduced, lightening holes do not need to be formed, and the manufacturing process of the end cover is further simplified.

In one embodiment, the first end flap and the second end flap are welded to each other; or

The first end flap and the second end flap are adhered to each other.

So, after processing shaping first end flap and second end flap respectively, can fix both forms a whole as the end cover through the mode of welding or bonding.

In one embodiment, the main casing comprises a casing bottom wall and a casing side wall formed by extending from the edge of the casing bottom wall in the same direction, the casing side wall circumferentially surrounds the casing bottom wall to form an accommodating cavity, and the open end of the accommodating cavity is formed at one end of the main casing, which is far away from the casing bottom wall. Thus, the end cover can be applied to the integrally formed main shell with one open end, and the end cover can seal the open end of the accommodating cavity to package the battery core.

In one embodiment, the main housing includes a first housing and a second housing, the first housing and the second housing being spliced to each other in a direction perpendicular to the first direction to form an accommodation chamber, and an opening end of the accommodation chamber is formed at opposite ends of the first housing and the second housing in the first direction. So, the end cover can be applied to the fashioned main casing body of both ends open-ended concatenation, and the end cover can seal two open ends that hold the chamber in order to encapsulate electric core.

In a second aspect, the present application provides a single battery, including the single battery casing in the above embodiment, the single battery further includes an electric core, and the electric core is accommodated in the accommodating cavity.

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

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

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

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. Also, like parts are designated by like reference numerals throughout the drawings. In the drawings:

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

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

fig. 3 is an exploded view of a battery cell according to an embodiment of the present disclosure;

FIG. 4 is a schematic view of the assembly of the battery cell of FIG. 3;

fig. 5 is a schematic view of a weld of a battery cell housing according to an embodiment of the present application;

fig. 6 is a schematic view of a weld of a battery cell housing according to another embodiment of the present application;

fig. 7 is a schematic view of a weld of a battery cell housing according to another embodiment of the present application;

fig. 8 is a schematic view of a weld of a battery cell housing according to yet another embodiment of the present application;

FIG. 9 is an exploded view of an end cap with an explosion proof valve according to an embodiment of the present application;

FIG. 10 is an exploded schematic view of an end cap according to another embodiment of the present application;

FIG. 11 is an exploded schematic view of an end cap according to yet another embodiment of the present application;

FIG. 12 is an exploded schematic view of an end cap of yet another embodiment of the present application;

FIG. 13 is an exploded schematic view of an end cap according to yet another embodiment of the present application;

fig. 14 is a schematic structural diagram of a battery cell housing according to an embodiment of the present application;

fig. 15 is a schematic structural diagram of a battery cell housing according to an embodiment of the present application;

the reference numerals in the detailed description are as follows:

1000. a vehicle;

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

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

40. a battery cell; 41. a battery cell housing; 412. a main housing; 412a, a containing cavity; 412b, an opening; 4121. a housing bottom wall; 4123. a housing sidewall; 4125. a first housing; 4127. a second housing; 413. an end cap; 4131. a first end flap; 4131a, a first sub-end cap piece; 4131b, a second sub-end cap; 4133. a second end flap; 4133a, third sub-end cap piece; 4133b, fourth sub-end cap piece; 413a, lightening holes; 413b, a pressure relief mechanism mounting hole; 413c, electrode terminal mounting holes; 415. welding seams; 43. an electric core; 45. an explosion-proof valve.

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 the association object, and means that three relationships may exist, for example, a and/or B, and may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter 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", "transverse", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate orientations and positional relationships that are based on the orientations and positional relationships shown in the drawings, and are used for convenience in describing the embodiments of the present application and for simplification of the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be configured and operated in a specific orientation, 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; they may be directly connected or indirectly connected through intervening media, or may be connected through the use of two elements or the interaction of two elements. 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, as the application of batteries becomes wider, in order to improve the structural strength of the batteries, the battery cell case may be formed of a material having a relatively high hardness, such as steel. However, as the hardness of the material increases, the degree of difficulty in molding increases. Meanwhile, as the demand for the capacity of the battery is increased, the size of the battery cell is increased, but the thickness of the battery cell case is decreased due to the limitation on the weight of the battery, so that the demand for the assembly accuracy is increased.

Based on the above consideration, in order to reduce the shaping degree of difficulty of battery cell shell, satisfy the requirement of assembly precision simultaneously, the inventor has designed a battery cell shell including main casing body and end cover through deep research, forms the end cover through first end cap piece and the coincide of second end cap piece, owing to can carry out independent processing respectively to first end cap piece and second end cap piece, consequently reduced the shaping degree of difficulty of battery cell shell, satisfied the requirement of assembly precision simultaneously.

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. Can use and possess this power supply system of power consumption device of constitution such as battery that this application disclosed, like this, be favorable to alleviating and automatically regulated electric core bulging force worsens, and supplementary electrolyte consumes, promotes the stability and the battery life-span 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 are described by taking an electric device as an example of a vehicle according to an embodiment of the present application.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a vehicle 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 not only serve as an operating power source of the vehicle 1000, but also serve as a driving power source of the vehicle 1000, instead of or in part of fuel or natural gas to provide driving power for the vehicle 1000.

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

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

The battery cell 40 may be a secondary battery or a primary battery, and may also be a lithium sulfur battery, a sodium ion battery, or a magnesium ion battery, but is not limited thereto. The battery cells 40 may be cylindrical, flat, rectangular parallelepiped, or other shapes. Referring to fig. 3, fig. 3 is a schematic structural diagram of a battery cell 40 according to some embodiments of the present disclosure. The battery cell 40 refers to the smallest unit constituting the battery 100, and includes a battery cell casing 41, a battery cell 43, and other functional components.

The cell 43 is a component of the battery cell 40 in which electrochemical reaction occurs. One or more cells 43 may be contained within the battery cell housing 41. The battery cell 43 is mainly formed by winding or stacking a positive electrode sheet and a negative electrode sheet, and a separator is usually provided between the positive electrode sheet and the negative electrode sheet. The portions of the positive and negative electrode sheets having the active material constitute the main body portion of the battery cell 43, and the portions of the positive and negative electrode sheets having no active material each constitute a tab. The positive electrode tab and the negative electrode tab may be located at one end of the main body portion together or at both ends of the main body portion, respectively. During the charge and discharge of the battery 100, the positive and negative active materials react with the electrolyte, and the tabs are connected to the electrode terminals to form a current loop.

Referring to fig. 3 and 4, according to some embodiments of the present disclosure, the present disclosure provides a battery cell housing 41 including a main housing 412 and an end cap 413, the main housing 412 includes a receiving cavity 412a and an opening 412b, the end cap 413 is used for covering the opening 412b, the end cap 413 includes a first end cap 4131 and a second end cap 4133, the first end cap 4131 and the second end cap 4133 are stacked along a first direction, and the first end cap 4131 protrudes outward relative to a side wall of the second end cap 4133 along a direction perpendicular to the first direction to form a overlapping portion extending along at least a portion of an edge of the second end cap 4133. The second end flap 4133 is positioned within the receiving cavity 412a and a side surface of the bridge adjacent the second end flap 4133 is configured to abut an end wall surrounding the opening 412b.

The main housing 412 and the end cap 413 are components that cooperate to form an internal environment of the battery cell 40, where the formed internal environment may be used to house the cell 43, electrolyte, and other components.

The main housing 412 includes a receiving cavity 412a forming an internal environment of the battery cell 40 and an opening 412b communicating the receiving cavity 412a with an external environment, and the battery cell 43 may be placed in the receiving cavity 412a through the opening 412b. It is understood that the main housing 412 may be a variety of shapes and sizes, such as rectangular parallelepiped, cylindrical, hexagonal prism, etc. Specifically, the shape of the casing may be determined according to the specific shape and size of the battery cell 43. The material of the housing can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., preferably stainless steel with high hardness.

The end cap 413 is a member covering the opening 412b of the main housing 412 to isolate the internal environment of the battery 100 from the external environment, and the shape of the end cap may be adapted to the shape of the opening 412b. The end cap may be made of a material having high hardness and strength (e.g., stainless steel), so that the end cap is not easily deformed when being extruded and collided, and thus the battery cell 40 may have high structural strength and improved safety performance. The end cap 413 may be provided with functional components such as electrode terminals. The electrode terminals may be used to electrically connect with the battery cells 43, so as to output or input electric energy of the battery cells 40. In some embodiments, the end cap 413 may further be provided with a pressure relief mechanism, such as an explosion-proof valve 45, for relieving the internal pressure when the internal pressure or temperature of the battery cell 40 reaches a threshold value. In some embodiments, an insulator may also be provided on the inside of end cap 413, which may be used to isolate the electrical connections within main housing 412 from end cap 413 to reduce the risk of short circuits. Illustratively, the insulator may be plastic, rubber, or the like.

Further, the first end cover 4131 and the second end cover 4133 are both in a sheet-like structure, and the "first end cover 4131 and the second end cover 4133 are stacked in the first direction" means that one side surface of the first end cover 4131 perpendicular to the thickness direction and one side surface of the second end cover 4133 perpendicular to the thickness direction are attached to each other, and the outer contour of the orthographic projection of the second end cover 4133 on the first end cover 4131 in the first direction is located within the outer contour of the first end cover 4131, so that the edge of the first end cover 4131 protrudes outward relative to the side wall of the second end cover 4133 in the direction perpendicular to the first direction, and the portion of the first end cover 4131 protruding from the second end cover 4133 forms a lap portion extending along at least part of the edge of the second end cover 4133. Also, the outer diameter of second end cap 4133 matches the inner diameter of opening 412b, and the outer diameter of first end cap 4131 is larger than the inner diameter of opening 412b. Wherein the first direction is the up-down direction in fig. 3.

In this way, when the cap 413 is coupled to the main housing 412, the second end cover 4133 is located in the accommodating cavity 412a, and a side surface of the overlapping portion close to the second end cover 4133 abuts against an end wall surrounding the opening 412b, so as to perform a limiting function to prevent the cap 413 from falling into the accommodating cavity 412a. Here, "an end wall surrounding opening 412 b" refers to an annular surface perpendicular to the first direction at the end of main housing 412 where opening 412b is provided.

Because the end cover 413 is formed by laminating the first end cover piece 4131 and the second end cover piece 4133, the first end cover piece 4131 and the second end cover piece 4133 can be respectively processed, and because the first end cover piece 4131 and the second end cover piece 4133 are both in a sheet-shaped structure, the processing technology is simple, the processing precision is high, the manufacturability of the top corners of the first end cover piece 4131 and the second end cover piece 4133 is high, the tolerance is small, and the limitation of the punch forming technology on the structure of the end cover 413 is avoided.

According to some embodiments of the present application, end cap 413 is welded to main housing 412 and forms weld 415, weld 415 protruding out of an outer sidewall of main housing 412 by a height of less than 0.1mm.

"weld 415" refers to a seam formed by melting and joining the metal at the junction of end cap 413 and main housing 412 using the high temperature of the welding heat source. In the present application, the end cap 413 and the main housing 412 may be welded by laser top welding or laser side welding. The top welding is a welding method in which a laser beam is downwardly emitted from the upper surface of the first end cap 4131 to the main housing 412 and the second end cap 4133 along a first direction. The side welding refers to a manner of welding by aligning the connection of the end cap 413 and the main case 412 in a direction perpendicular to the first direction along the laser beam.

Further, the first end flap 4131 and the second end flap 4133 may be configured to different sizes based on different shapes and structural strength requirements. In some embodiments, the first end flap 4131 is 0.1mm to 0.3mm thick and the second end flap 4133 is 0.5mm to 0.8mm thick, and in such embodiments, the first end flap 4131 is thin and therefore may be welded through the first end flap 4131 by top welding. In other embodiments, first end flap 4131 is 0.2mm to 1mm thick and second end flap 4133 is 0.2mm to 1mm thick, and in such embodiments, the welding may be performed by side welding because of the greater thickness of first end flap 4131.

Specifically, as shown in fig. 5, the outer sidewall of main housing 412 is a side surface of main housing 412 facing away from receiving cavity 412a to the external environment. When first end cap 4131 protrudes slightly from the outer sidewall of main housing 412, if top-welding is used for welding, weld 415 is formed inside the connection between end cap 413 and main housing 412 and does not protrude from the outer sidewall of main housing 412.

When the edge of first end cap 4131 is located inside the outer sidewall of main housing 412, as shown in fig. 6, if the welding is performed by top welding, weld 415 may be formed to protrude from the outer sidewall of main housing 412 but to protrude by less than 0.1mm in height.

As shown in fig. 7, when the first end cap 4131 protrudes slightly from the outer sidewall of the main housing 412, if the welding is performed by side welding, the formed welding seam 415 is located inside the connection between the end cap 413 and the main housing 412 and does not protrude from the outer sidewall of the main housing 412.

When the rim of first end cap 4131 is located inside the outer sidewall of main housing 412, as shown in fig. 8, if the welding is performed by side welding, weld 415 may be formed to protrude from the outer sidewall of main housing 412 but to a height of less than 0.1mm. In this way, since the end cap 413 and the main housing 412 may be welded in different welding directions, an appropriate welding direction may be selected according to the battery cells 43 with different sizes, and therefore, the apparatus compatibility is high. Moreover, since the height of the welding seam 415 protruding out of the outer side wall of the main housing 412 is less than 0.1mm, the overall volume of the battery cell 40 is not substantially increased while the accommodating cavity 412a is closed, and the application range of the battery cell 40 is expanded.

The position of weld 415 formed by welding using the side welding method is not limited to that shown in fig. 7 and 8, and end cap 413 and main case 412 may be hermetically connected.

As shown in fig. 9, according to some embodiments of the present application, at least one of the first end flap 4131 and the second end flap 4133 is provided with at least one lightening hole 413a.

The lightening holes 413a are through holes penetrating through the upper and lower surfaces of the first end cover 4131 or the second end cover 4133 in the thickness direction, and the shapes of the lightening holes 413a are not limited and can be set according to the shapes and thicknesses of the first end cover 4131 and the second end cover 4133, the strength requirement of the end cover 413 and other factors. In some embodiments, the lightening holes 413a are open only to the first end flap 4131, in other embodiments the lightening holes 413a are open only to the second end flap 4133, and in other embodiments a portion of the lightening holes 413a are open to the first end flap 4131 and another portion of the lightening holes 413a are open to the second end flap 4133.

The weight of the end cover 413 is reduced due to the lightening holes 413a, and meanwhile, the material consumption of the end cover 413 is reduced, so that the manufacturing cost of the battery unit 40 is reduced.

With continued reference to fig. 9, according to some embodiments of the present disclosure, one of the first end cover 4131 and the second end cover 4133 is formed with a pressure relief mechanism mounting hole 413b, the other of the first end cover 4131 and the second end cover 4133 is formed with a weight reduction hole 413a correspondingly communicating with the pressure relief mechanism mounting hole 413b, and an orthographic projection of an edge of the pressure relief mechanism mounting hole 413b on a surface formed with the weight reduction hole 413a is located inside an edge of the weight reduction hole 413a.

The pressure relief mechanism attachment hole 413b is a through hole penetrating the upper and lower surfaces of the first end cover 4131 or the second end cover 4133 in the thickness direction. The shape of the pressure relief mechanism mounting hole 413b matches the shape of the explosion-proof valve 45, so that the explosion-proof valve 45 can be mounted on the end cover 413 through the pressure relief mechanism mounting hole 413b and communicate with the housing chamber 412a.

Since the orthographic projection of the edge of the pressure relief mechanism mounting hole 413b on the surface provided with the lightening hole 413a is located inside the edge of the lightening hole 413a, the pressure relief mechanism mounting hole 413b can be completely exposed to one side of the lightening hole 413a, thereby preventing the first end cover piece 4131 or the second end cover piece 4133 which is not provided with the pressure relief mechanism mounting hole 413b from shielding the pressure relief mechanism mounting hole 413b to influence the installation of the pressure relief mechanism mounting hole 413 b.

Furthermore, the first end cover piece 4131 and the second end cover piece 4133 are respectively provided with two electrode terminal mounting holes 413c, the two electrode terminal mounting holes 413c on the first end cover piece 4131 are correspondingly communicated with the two electrode terminal mounting holes 413c on the second end cover piece 4133, and the shape of the electrode terminal mounting holes 413c is matched with the shape of the electrode terminals for mounting the electrode terminals. The electrode terminal is used for electrically connecting with the battery cell 43 and outputting or inputting electric energy of the battery cell 40.

It can be understood that when the weight-reducing holes 413a are formed in both the first end cover 4131 and the second end cover 4133, the weight-reducing holes 413a are arranged in a staggered manner, and the orthographic projection of the weight-reducing holes 413a of one of the first end cover 4131 and the second end cover 4133 is located in the region where the weight-reducing holes 413a are not formed, so that the remaining regions of the end cover 413 formed by overlapping the first end cover 4131 and the second end cover 4133, except for the mounting holes of the pressure relief mechanism mounting holes 413b, the electrode terminal mounting holes 413c and the like, are of a solid structure, thereby playing a role of sealing the accommodating cavity 412a.

As shown in fig. 10 and 11, according to some embodiments of the present application, one of the first end cap piece 4131 or the second end cap piece 4133 is in the shape of a closed loop.

The lightening holes 413a are only formed in the first end cover piece 4131 or the second end cover piece 4133, the number of the lightening holes 413a is one, the shapes of the lightening holes 413a are similar to the shapes of the first end cover piece 4131 or the second end cover piece 4133, and the areas of the lightening holes 413a are slightly smaller than the areas of the first end cover piece 4131 or the second end cover piece 4133, so that the first end cover piece 4131 or the second end cover piece 4133 with the lightening holes 413a are formed into a closed ring shape. It will be appreciated that the width of the annular first end cap 4131 or second end cap 4133 is not limited and may be set as desired to meet strength and attachment requirements.

Specifically, in some embodiments, the first end flap 4131 is ring-shaped, the inner edge of the first end flap 4131 is secured to the edge of the second end flap 4133, and the outer edge of the first end flap 4131 protrudes beyond the second end flap 4133 to form a lap joint. In other embodiments, the second end cap piece 4133 is ring-shaped, and the sidewall edges of the first end cap piece 4131 protrude from the second end cap piece 4133 to form a lap joint.

Thus, the first end cover piece 4131 or the second end cover piece 4133 is simplified into a ring shape, so that the weight of the end cover 413 is effectively reduced, the material consumption is reduced, a plurality of lightening holes 413a are not required to be formed, and the manufacturing process of the end cover 413 is further simplified.

As shown in fig. 12, according to some embodiments of the present application, the first end flap 4131 includes a first sub end flap 4131a and a second sub end flap 4131b, the first and second

sub end flaps

4131a and 4131b being parallel and spaced apart on opposite sides of the second end flap 4133 in either direction perpendicular to the first direction.

Specifically, the first sub-end cover piece 4131a and the second sub-end cover piece 4131b are in an elongated structure with the same shape, the first sub-end cover piece 4131a and the second sub-end cover piece 4131b are arranged in parallel and spaced at two opposite sides of the second end cover piece 4133 in the width direction, in the length direction of the second end cover piece 4133, the first sub-end cover piece 4131a and the second sub-end cover piece 4131b extend from one end of the second end cover piece 4133 to the other end of the second end cover piece 4133, the first sub-end cover piece 4131a and the second sub-end cover piece 4131b are connected to the second end cover piece 4133 at one side of the width direction, and the other side protrudes outwards from the second end cover piece 4133 to form two overlapping parts.

Therefore, the first end cover piece 4131 is simplified into two strip-shaped sheet structures, so that the weight of the end cover 413 is effectively reduced, material consumption is reduced, lightening holes 413a do not need to be formed, and the manufacturing process of the end cover 413 is further simplified.

As shown in fig. 13, according to some embodiments of the present application, the second end cover piece 4133 includes third and fourth sub

end cover pieces

4133a and 4133b, the third and fourth sub

end cover pieces

4133a and 4133b being disposed in parallel and spaced apart on opposite sides of the first end cover piece 4131 in either direction perpendicular to the first direction.

Specifically, the third sub-end cover piece 4133a and the fourth sub-end cover piece 4133b are of an elongated structure with the same shape, the third sub-end cover piece 4133a and the fourth sub-end cover piece 4133b are arranged in parallel and spaced at two opposite sides of the first end cover piece 4131 in the width direction, in the length direction of the first end cover piece 4131, the third sub-end cover piece 4133a and the fourth sub-end cover piece 4133b extend from one end of the first end cover piece 4131 to the other end of the first end cover piece 4131, and two long side edges of the first end cover piece 4131 protrude outwards relative to the third sub-end cover piece 4133a and the fourth sub-end cover piece 4133b to form two overlapping portions.

Therefore, the second end cover piece 4133 is simplified into two strip-shaped thin sheet structures, so that the weight of the end cover 413 is effectively reduced, the material consumption is reduced, lightening holes 413a do not need to be formed, and the manufacturing process of the end cover 413 is further simplified.

According to some embodiments of the present application, first end flap 4131 and second end flap 4133 are welded to each other; or first end flap 4131 and second end flap 4133 are adhered to each other.

In some embodiments, the first end cap 4131 and the second end cap 4133 are fixedly attached to each other by welding, which may be the edge of the end cap 413 or the edge of the opening such as the pressure relief mechanism mounting hole 413 b. In other embodiments, the first end flap 4131 and the second end flap 4133 are secured to each other by adhesive bonding to each other, such as the edges of the end cap 413 and the edges of the openings such as the pressure relief mechanism mounting holes 413 b.

Thus, after the first end cap 4131 and the second end cap 4133 are formed separately, they are fixed together by welding or bonding to form the end cap 413.

Referring to fig. 14, according to some embodiments of the present disclosure, the main housing 412 includes a housing bottom wall 4121 and a housing sidewall 4123 extending from an edge of the housing bottom wall 4121 in the same direction, the housing sidewall 4123 circumferentially surrounds the housing bottom wall 4121 to form an accommodating cavity 412a, and an opening 412b of the accommodating cavity 412a is formed at an end of the accommodating cavity 412a away from the housing bottom wall 4121.

Specifically, the main housing 412 is substantially a one-piece cubic structure, the battery cell 43 is accommodated in the accommodating cavity 412a, and the end cap 413 is matched with the housing bottom wall 4121 in shape to close the opening 412b. It is understood that the shape of the main housing 412 is not limited thereto, and may be other shapes such as a cylindrical shape.

Thus, the end cap 413 may be applied to the integrally formed main casing 412 having the opening 412b at one end, and the end cap 413 may close the opening 412b to encapsulate the battery cell 43.

As shown in fig. 15, according to some embodiments of the present application, the main housing 412 includes a first housing 4125 and a second housing 4127, the first housing 4125 and the second housing 4127 are spliced with each other in a direction perpendicular to the first direction to form an accommodating chamber 412a, and openings 412b of the accommodating chamber 412a are formed at opposite ends of the first housing 4125 and the second housing 4127 in the first direction.

Specifically, the main housing 412 is a cubic structure formed by splicing a first housing 4125 and a second housing 4127, and the cross section of the first housing 4125 and the second housing 4127 perpendicular to the first direction is substantially in a shape of "door", so that the accommodating chamber 412a is formed by splicing each other. The two end caps 413 are respectively coupled to the two opposite openings 412b of the accommodating chamber 412a in the first direction to close the accommodating chamber 412a.

In this way, the end cap 413 may be applied to the spliced main casing 412 with the openings 412b at two ends, and the end cap 413 may close the two openings 412b of the accommodating cavity 412a to encapsulate the battery cell 43.

According to some embodiments of the present application, the present application further provides a battery cell 40, which includes the battery cell casing 41 according to any of the above solutions, and the battery cell 40 further includes a battery core 43, and the battery core 43 is accommodated in the accommodating cavity 412a.

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

According to some embodiments of the present application, there is also provided an electrical device, including the battery 100 according to any of the above aspects, and the battery 100 is used to provide electrical energy for the electrical device, which may be any of the aforementioned apparatuses or systems using the battery 100.

Referring again to fig. 3 and 4, according to some embodiments of the present disclosure, the present disclosure provides a battery cell housing 41, including a main housing 412 and an end cap 413, where the main housing 412 includes a receiving cavity 412a and an opening 412b, the end cap 413 includes a first end cap 4131 and a second end cap 4133, the first end cap 4131 and the second end cap 4133 are stacked along a first direction and fixed to each other by welding or adhesion, and an edge of the first end cap 4131 protrudes outward relative to a side wall of the second end cap 4133 along a direction perpendicular to the first direction to form a overlapping portion circumferentially surrounding the second end cap 4133. The second end cover 4133 is located in the receiving cavity 412a, one side surface of the overlapping part close to the second end cover 4133 is supported on the end wall of the opening 412b, the joint of the end cover 413 and the main housing 412 is fixedly connected to each other by forming a welding seam 415 by top welding or side welding, and the height of the welding seam 415 protruding out of the outer side wall of the main housing 412 is less than 0.1mm.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit 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 housing, comprising:

a main housing (412) including a housing chamber (412 a) and an opening (412 b);

an end cap (413) for covering the opening (412 b), the end cap (413) comprising a first end cover sheet (4131) and a second end cover sheet (4133), the first end cover sheet (4131) and the second end cover sheet (4133) are stacked along a first direction, the first end cover sheet (4131) protrudes outwards relative to the side wall of the second end cover sheet (4133) along a direction perpendicular to the first direction to form a lap part extending along at least part of the edge of the second end cover sheet (4133);

the second end cover sheet (4133) is positioned in the accommodating cavity (412 a), and one side surface of the lap part close to the second end cover sheet (4133) is configured to abut against an end wall surrounding the opening (412 b).

2. The battery cell casing of claim 1, wherein the end cap (413) is welded to the main housing (412) and forms a weld (415), and the weld (415) protrudes out of the outer side wall of the main housing (412) by a height of less than 0.1mm.

3. The battery cell casing of claim 1, wherein at least one of the first end cap piece (4131) and the second end cap piece (4133) is provided with at least one lightening hole (413 a).

4. The battery cell casing according to claim 3, wherein one of the first end cap piece (4131) and the second end cap piece (4133) is opened with a pressure relief mechanism mounting hole (413 b), the other of the first end cap piece (4131) and the second end cap piece (4133) is opened with a weight reduction hole (413 a) correspondingly communicated with the pressure relief mechanism mounting hole (413 b), and an orthographic projection of an edge of the pressure relief mechanism mounting hole (413 b) on a surface opened with the weight reduction hole (413 a) is located inside an edge of the weight reduction hole (413 a).

5. The battery cell housing of claim 1, wherein one of the first end cap piece (4131) or the second end cap piece (4133) is in the shape of a closed loop.

6. The battery cell housing of claim 1, wherein the first end cap piece (4131) comprises a first sub end cap piece (4131 a) and a second sub end cap piece (4131 b), the first sub end cap piece (4131 a) and the second sub end cap piece (4131 b) being disposed in parallel and spaced apart on opposite sides of the second end cap piece (4133) in either direction perpendicular to the first direction.

7. The battery cell housing of claim 1, wherein the second end cap piece (4133) comprises a third sub end cap piece (4133 a) and a fourth sub end cap piece (4133 b), the third sub end cap piece (4133 a) and the fourth sub end cap piece (4133 b) being parallel and spaced apart from opposite sides of the first end cap piece (4131) in either direction perpendicular to the first direction.

8. The battery cell housing of claim 1, wherein the first end cap piece (4131) and the second end cap piece (4133) are welded to each other; or

The first end flap (4131) and the second end flap (4133) are adhered to each other.

9. The battery cell casing according to any one of claims 1 to 8, wherein the main casing (412) comprises a casing bottom wall (4121) and a casing side wall (4123) formed by extending from an edge of the casing bottom wall (4121) in the same direction, the casing side wall (4123) circumferentially surrounds the casing bottom wall (4121) to form the accommodating cavity (412 a), and the opening (412 b) is formed at an end of the main casing (412) away from the casing bottom wall (4121).

10. The battery cell casing according to any one of claims 1 to 8, wherein the main housing (412) comprises a first housing (4125) and a second housing (4127), the first housing (4125) and the second housing (4127) being joined to each other in a direction perpendicular to a first direction to form the accommodation chamber (412 a), the opening (412 b) being formed at opposite ends of the first housing (4125) and the second housing (4127) in the first direction.

11. A battery cell, characterized in that it comprises a battery cell casing according to any one of claims 1 to 10, and a battery cell (43), wherein the battery cell (43) is accommodated in the accommodating cavity (412 a).

12. A battery comprising the battery cell of claim 11.

13. An electric device comprising the battery of claim 12.