Battery cell, battery, electric device, and manufacturing equipment and method of battery cell

Abstract

The embodiments of the present application provide a battery cell, a battery, an electrical device, and a manufacturing apparatus and method for a battery cell. The battery cell includes: a shell, an end cover, and a breathable member. The shell has an opening. The end cover is used to cover the opening. The material of the end cover is metal. The breathable member is at least partially located between the end cover and the shell. The breathable member is respectively connected to the end cover and the shell. The breathable member is configured so that when the air pressure inside the battery cell is greater than the air pressure outside the battery cell, the internal gas is released to the outside through the breathable member, thereby reducing the expansion deformation of the battery cell caused by gas production and improving the safety performance of the battery cell; the metal end cover and the shell are connected by a breathable member instead of welding the metal end cover and the shell, thereby reducing the possibility of internal short of the battery cell and improving the safety performance of the battery cell.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery cell, a battery, an electrical device, and a manufacturing device and method for a battery cell. Background Art

[0002] Power batteries are widely used in electronic devices such as mobile phones and laptops due to their high energy density and environmental friendliness. In recent years, in order to cope with environmental issues, gasoline price issues, and energy storage issues, the application of power batteries has rapidly expanded to hybrid vehicles, ships, and energy storage systems.

[0003] In the development of power battery technology, in addition to improving the performance of battery cells, safety is also an issue that needs to be considered. Therefore, how to improve the safety of battery cells is an urgent problem to be solved in battery technology. Summary of the invention

[0004] The present application provides a battery cell, a battery, an electrical device, and a manufacturing device and method for a battery cell, which are used to improve the safety performance of the battery cell.

[0005] The first aspect of the present application provides a battery cell, comprising: a shell, an end cover and a breathable member. The shell has an opening. The end cover is used to cover the opening. The material of the end cover is metal. The breathable member is at least partially located between the end cover and the shell. The breathable member is respectively connected to the end cover and the shell. The breathable member is configured so that when the air pressure inside the battery cell is greater than the air pressure outside the battery cell, the internal gas is released to the outside through the breathable member.

[0006] In the above technical solution, the air-permeable member is configured to be at least partially located between the metal end cap and the shell, and is respectively connected with the metal end cap and the shell. When the air pressure inside the battery cell is greater than the air pressure outside the battery cell, the internal gas is released to the outside through the air-permeable member. Thus, the gas generated during the use of the battery cell can be discharged, reducing the expansion and deformation of the battery cell due to gas production, and improving the safety performance of the battery cell; at the same time, the air-permeable member is respectively connected with the metal end cap and the shell, replacing the welding of the metal end cap and the shell, which to a certain extent avoids the generation of burrs or metal chips during the welding process, thereby reducing the possibility of internal short circuit of the battery cell and improving the safety performance of the battery cell.

[0007] In some embodiments, the air-permeable member is provided with a first recessed portion on a side facing the end cap, and a first protruding portion is provided on the periphery of the end cap, and at least a portion of the first protruding portion is accommodated in the first recessed portion.

[0008] In the above technical solution, the first recessed portion of the breathable component is cooperatively connected with the first raised portion of the end cover, thereby increasing the matching area between the breathable component and the end cover, and limiting the relative movement of the breathable component and the end cover by clamping the raised portion and the recessed portion, thereby improving the structural stability between the end cover and the breathable component; mechanical structure cooperation connection or chemical bond connection replaces welding, thereby avoiding the generation of welding slag such as metal chips, reducing the possibility of internal short circuit of the battery cell, and improving the safety performance of the battery cell.

[0009] In some embodiments, the air-permeable member includes a first surrounding portion, a first connecting portion, and a second surrounding portion. The first surrounding portion surrounds a side of the shell facing the end cap. The second surrounding portion surrounds a side of the shell away from the end cap. The first connecting portion is attached to the end surface of the shell surrounding the opening and is used to connect the first surrounding portion and the second surrounding portion. The first surrounding portion, the second surrounding portion, and the first connecting portion jointly define a receiving space. The shell includes an insertion portion. The insertion portion is received in the receiving space.

[0010] In the above technical solution, the first surrounding portion surrounds the side of the shell facing the end cover, the second surrounding portion surrounds the side of the shell away from the end cover, and the first connecting portion abuts against the end surface of the shell surrounding the opening, and is used to connect the first surrounding portion and the second surrounding portion. The first surrounding portion is used to release the internal gas to the outside through the first surrounding portion when the air pressure inside the battery cell is greater than the air pressure outside the battery cell, thereby reducing the expansion deformation of the battery cell due to gas production and improving the safety performance of the battery cell; increasing the matching area of ​​the air permeable component and the shell, and improving the structural stability between the air permeable component and the shell; replacing welding with mechanical structure matching connection or chemical bond connection to avoid the generation of welding slag such as metal chips, reducing the possibility of internal short circuit of the battery cell, and improving the safety performance of the battery cell.

[0011] In some embodiments, the first surrounding portion and the second surrounding portion are used to clamp the insertion portion.

[0012] In the above technical solution, the first surrounding portion and the second surrounding portion are used to clamp the insertion portion, thereby limiting the movement of the shell in a direction parallel to the end cover, thereby improving the structural stability.

[0013] In some embodiments, the inserting portion has a second protruding portion protruding outward, and the second surrounding portion has a second recessed portion arranged opposite to the second protruding portion. At least a portion of the second protruding portion is accommodated in the second recessed portion.

[0014] In the above technical solution, the second protrusion cooperates with the second recess to limit the movement of the shell in the vertical direction of the end cover, and the relative movement of the shell and the air-permeable component is limited by the cooperation between the protrusion and the recess, thereby improving the structural stability.

[0015] In some embodiments, the air-permeable member includes at least one second connecting portion located in the accommodating space, the inserting portion has at least one through hole, and the second connecting portion is configured to pass through the through hole to connect the first surrounding portion and the second surrounding portion.

[0016] In the above technical solution, the second connecting portion is configured to pass through the through hole to connect the first surrounding portion and the second surrounding portion, and the breathable component has at least one second connecting portion, and the insertion portion has at least one through hole, thereby improving the structural stability between the breathable component and the shell.

[0017] In some embodiments, a plurality of through holes are distributed at intervals in a plurality of regions of the inserting portion along the circumferential direction of the opening, and each through hole corresponds to a second connecting portion.

[0018] In the above technical solution, a plurality of second connecting portions are provided and spaced apart along the circumference of the opening, thereby further improving the structural stability between the air-permeable component and the shell.

[0019] In some embodiments, the gas permeable member is chemically bonded to the end cap.

[0020] In the above technical solution, the breathable component and the end cover are connected by chemical bonds, which has better structural stability than simple interference fit. Chemical bonds are used instead of welding to avoid the generation of metal chips and other welding slag, reduce the possibility of internal short circuits in battery cells, and improve the safety performance of battery cells.

[0021] A second aspect of the present application provides a battery, comprising a housing and a battery cell accommodated in the housing.

[0022] In some embodiments, the battery includes at least two battery cells, a heat insulating member and a support member. The heat insulating member is disposed between two adjacent battery cells. The support member is supported between two adjacent battery cells and abuts against the end of the heat insulating member away from the end cover. The two second surrounding portions of the two adjacent battery cells abut against the heat insulating member from both sides to form a gap between the heat insulating member and the housing.

[0023] In the above technical solution, the heat insulating member cooperates with the second surrounding portion and the support member to form a gap between the heat insulating member and the shell, thereby improving the thermal insulation performance of the battery, preventing the thermal failure of a single battery cell from affecting other surrounding battery cells, and thus improving the safety performance of the battery.

[0024] The third aspect of the present application provides an electrical device, comprising the battery provided in the second aspect of the present application.

[0025] The fourth aspect of the present application provides a method for manufacturing a battery cell, comprising: providing a shell having an opening; providing an end cover, the end cover being made of metal; providing a breathable component; fixing the breathable component to the outer periphery of the end cover; and covering the end cover on the opening; wherein at least a portion of the breathable component is located between the end cover and the shell, the breathable component is respectively connected to the end cover and the shell, and the breathable component is configured so that when the air pressure inside the battery cell is greater than the air pressure outside the battery cell, the internal gas is released to the outside through the breathable component.

[0026] The fifth aspect of the present application provides a manufacturing device for a battery cell, comprising: a first providing device for providing a shell having an opening; a second providing device for providing an end cover, the end cover being made of metal; a third providing device for providing a breathable component; and an assembling device for fixing the breathable component to the outer periphery of the end cover and for covering the end cover on the opening; wherein at least a portion of the breathable component is located between the end cover and the shell, the breathable component is respectively connected to the end cover and the shell, and the breathable component is configured so that when the air pressure inside the battery cell is greater than the air pressure outside the battery cell, the internal gas is released to the outside through the breathable component.

[0027] The present application provides a battery cell, a battery, an electrical device, and a manufacturing device and method for a battery cell. In the battery cell, a gas-permeable member is configured to be at least partially located between a metal end cap and a shell, and is respectively connected with the metal end cap and the shell. When the gas pressure inside the battery cell is greater than the gas pressure outside the battery cell, the gas inside is released to the outside through the gas-permeable member. Thus, the gas generated during the use of the battery cell can be discharged, reducing the expansion and deformation of the battery cell due to gas production, and improving the safety performance of the battery cell; at the same time, the gas-permeable member is respectively connected with the metal end cap and the shell, replacing the welding of the metal end cap and the shell, avoiding the generation of burrs or metal chips during the welding process, thereby reducing the possibility of internal shorts in the battery cell and improving the safety performance of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the drawings without paying creative work.

[0029] Figure 1 It is an exploded view of a battery cell disclosed in one embodiment of the present application;

[0030] Figure 2 is an axonometric diagram of a battery cell disclosed in one embodiment of the present application;

[0031] Figure 3is a top view of a battery cell disclosed in one embodiment of the present application;

[0032] Figure 4 In one embodiment of the present application Figure 3 Sectional view at AA;

[0033] Figure 5 In one embodiment of the present application Figure 4 Enlarged view at C;

[0034] Figure 6 In another embodiment of the present application Figure 4 Enlarged view at C;

[0035] Figure 7 In one embodiment of the present application Figure 3 Cross-sectional view at BB;

[0036] Figure 8 In one embodiment of the present application Figure 7 Enlarged view at D;

[0037] Fig. 9 is a schematic diagram of the exploded structure of a battery disclosed in one embodiment of the present application;

[0038] Fig.10 yes Fig. 9 A partial enlarged view of

[0039] Fig.11 is a structural schematic diagram of a vehicle disclosed in an embodiment of the present application;

[0040] Fig.12 is a flow chart of a battery cell manufacturing method disclosed in one embodiment of the present application;

[0041] Fig.13 is a schematic block diagram of a battery cell manufacturing device disclosed in an embodiment of the present application;

[0042] In the drawings, the drawings are not drawn to scale.

[0043] Marking Description:

[0044] 10- vehicle, 11- controller, 12- motor;

[0045] 20 - battery, 21 - housing, 211 - first part, 212 - second part, 22 - receiving chamber;

[0046] 31-insulation member, 32-support member, 33-gap;

[0047] 40 - battery cell, 41 - housing, 411 - opening, 412 - insertion portion, 4121 - second protruding portion, 42 - end cover, 421 - first protruding portion, 43 - air-permeable member, 431 - first surrounding portion, 432 - second surrounding portion, 433 - first connecting portion, 434 - second connecting portion;

[0048] 2000 - manufacturing equipment; 2100 - first providing device; 2200 - second providing device; 2300 - third providing device; 2400 - assembling device. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0050] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0051] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0052] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0053] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0054] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0055] The term "plurality" used in the present application refers to two or more (including two).

[0056] In the present application, battery cells may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries or magnesium-ion batteries, etc., and the embodiments of the present application do not limit this. Battery cells may be cylindrical, flat, rectangular or other shapes, etc., and the embodiments of the present application do not limit this. Battery cells are generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells and soft-pack battery cells, and the embodiments of the present application do not limit this.

[0057] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in the present application may include a battery module or a battery pack. The battery generally includes a box for encapsulating one or more battery cells. The box can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells.

[0058] The battery cell includes an electrode assembly and an electrolyte. The electrode assembly is composed of a positive electrode sheet, a negative electrode sheet and a separator. The battery cell mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. The positive electrode sheet includes a positive electrode collector and a positive electrode active material layer. The positive electrode active material layer is coated on the surface of the positive electrode collector. The positive electrode collector not coated with the positive electrode active material layer protrudes from the positive electrode collector coated with the positive electrode active material layer. The positive electrode collector not coated with the positive electrode active material layer serves as the positive electrode tab. Taking lithium-ion batteries as an example, the material of the positive electrode collector can be aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc. The negative electrode sheet includes a negative electrode collector and a negative electrode active material layer. The negative electrode active material layer is coated on the surface of the negative electrode collector. The negative electrode collector not coated with the negative electrode active material layer protrudes from the negative electrode collector coated with the negative electrode active material layer. The negative electrode collector not coated with the negative electrode active material layer serves as the negative electrode tab. The material of the negative electrode collector can be copper, and the negative electrode active material can be carbon or silicon, etc. In order to ensure that a large current can pass without melting, the number of positive electrode tabs is multiple and stacked together, and the number of negative electrode tabs is multiple and stacked together. The material of the isolation film can be PP (polypropylene) or PE (polyethylene). In addition, the electrode assembly can be a winding structure or a laminated structure, and the embodiments of the present application are not limited thereto.

[0059] The battery cell may further include a shell and an end cap assembly, wherein the end cap assembly is covered on the shell to provide a closed space for the electrode assembly and the electrolyte, and the electrode assembly is electrically connected to the electrode terminal of the end cap assembly.

[0060] For a general metal top cover battery cell, the interior of the battery cell is a closed space, and the metal top cover and the shell are generally welded.

[0061] The inventors found that a battery cell usually includes a shell, an electrode assembly and an electrolyte solution contained in the shell, and an end cap connected to the shell. The electrode assembly includes a positive electrode sheet, a negative electrode sheet, and a diaphragm separating the positive electrode sheet and the negative electrode sheet. In order to avoid leakage of the electrolyte solution, the end cap usually seals the shell. The battery cell will produce gas during the charging and discharging process. Because the inside of the battery cell is a closed space, as the battery cell is used for a longer period of time, the gas inside the battery cell gradually increases, and the internal air pressure gradually increases, which can easily cause the risk of battery deformation and deterioration of the performance of the electrode assembly, thereby affecting the safety of the battery cell; during the welding process of the end cap and the shell of the battery cell, burrs or metal chips will be generated, which may cause a short circuit inside the battery cell, thereby affecting the safety of the battery cell.

[0062] In view of this, the embodiment of the present application proposes a technical solution, by configuring the air-permeable component to be at least partially located between the metal end cap and the shell, and respectively connected with the metal end cap and the shell, when the air pressure inside the battery cell is greater than the air pressure outside the battery cell, the internal gas is released to the outside through the air-permeable component. In this way, the gas generated during the use of the battery cell can be discharged, reducing the expansion and deformation of the battery cell due to gas production, and improving the safety performance of the battery cell; at the same time, the air-permeable component is respectively connected with the metal end cap and the shell, replacing the welding of the metal end cap and the shell, avoiding the generation of burrs or metal chips during the welding process, thereby reducing the possibility of internal short circuit of the battery cell and improving the safety performance of the battery cell.

[0063] The technical solutions described in the embodiments of the present application are applicable to battery cells, batteries, electrical equipment using batteries, and manufacturing equipment and methods for battery cells.

[0064] Reference Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 , Figure 1 An exploded view of a battery cell 40 provided in one embodiment of the present application is shown in FIG. Figure 2 This is an axonometric diagram of a battery cell 40 provided in one embodiment of the present application. Figure 3 A top view of a battery cell 40 provided in one embodiment of the present application is shown in FIG. Figure 4 for Figure 3 The cross-sectional view at AA, Figure 5 In one embodiment of the present application Figure 4 Enlarged view at C. The present application provides a battery cell 40, comprising: a shell 41, an end cover 42 and a breathable member 43. The shell 41 has an opening 411. The end cover 42 is used to cover the opening 411. The material of the end cover 42 is metal. The breathable member 43 is at least partially located between the end cover 42 and the shell 41. The breathable member 43 is respectively connected to the end cover 42 and the shell 41. The breathable member 43 is configured so that when the air pressure inside the battery cell 40 is greater than the air pressure outside the battery cell 40, the internal gas is released to the outside through the breathable member 43.

[0065] The shell 41 may be the outer shell of the battery cell 40, and is used to accommodate the electrode assembly. The shell 41 may be in various shapes, for example, a hollow three-dimensional structure such as a hollow cylinder or a hollow cuboid, and the electrode assembly is accommodated in the accommodation cavity 22 of the hollow three-dimensional structure. The shape of the shell 41 may be specifically determined according to the shape of the electrode assembly. For example, if the electrode assembly is a cylindrical structure, the shell 41 may be a hollow cylindrical structure; if the electrode assembly is a cuboid structure, the shell 41 may be a hollow cuboid structure. The material of the shell 41 may be a conductive material such as copper, iron, aluminum, stainless steel, aluminum alloy, or an insulating material such as plastic or rubber.

[0066] The opening 411 can be provided on one or several faces of the shell 41. The opening 411 can be in various shapes, such as a rectangle, a circle, etc. After the shape of the shell 41 is determined, the shape of the opening 411 is also determined accordingly. Optionally, if the shell 41 is a hollow cylindrical structure, the opening 411 is a circle; if the shell 41 is a hollow rectangular parallelepiped structure, the opening 411 is a rectangle. The opening 411 can be one or two. Optionally, when there is one opening 411, it can be provided on any face of the hollow rectangular parallelepiped shell 41, or on the top face or top face of the hollow cylindrical shell 41; when there are two openings 411, they can be provided on two opposite side faces of the hollow rectangular parallelepiped shell 41, or on the top face and bottom face of the hollow cylindrical shell 41; when there are more openings 411, it depends on the actual situation.

[0067] The end cap 42 is used to seal the opening 411 of the housing 41. The end cap 42 can be in various shapes, such as round, rectangular, etc. The shape of the end cap 42 depends on the shape of the housing 41. If the housing 41 is a cylindrical structure, a round end cap 42 can be selected; if the housing 41 is a rectangular structure, a rectangular end cap 42 can be selected. The end cap 42 is a carrier of other components such as electrode terminals. The end cap 42 can serve as an output pole of the battery cell 40, which is the part that connects the battery cell 40 with other components and outputs the electrical energy of the battery cell 40.

[0068] The material of the air-permeable member 43 can be one or more of polypropylene or modified polypropylene, polyethylene terephthalate, ethylene propylene copolymer, cast polypropylene, polytetrafluoroethylene, polyvinylidene fluoride, polyacrylonitrile, etc. The air-permeable member 43 is air-permeable and can gradually release the air pressure inside the battery cell to prevent the battery cell structure from being damaged and causing failure after the air pressure inside the battery cell increases.

[0069] Reference Figure 5 In some embodiments, the cross-section of the air-permeable member 43 may be rectangular or quasi-rectangular, i.e., a shape that can be obtained by a certain deformation. The inner and outer sides of the air-permeable member are respectively matched with the end cover 42 and the shell 41 to complete the fixation.

[0070] In other embodiments, the air-permeable member 43 may be structurally deformed based on a rectangular or quasi-rectangular cross section to improve the strength of the fit between the air-permeable member 43 and the end cover 42 and the shell 41 and to improve structural stability.

[0071] The air-permeable member 43 is at least partially located between the end cap 42 and the housing 41 to achieve the function of connecting the end cap 42 and the housing 41. The air-permeable member 43 may also partially extend outward to the outside of the housing 41 to cooperate with the housing 41; may also partially extend to the top of the end cap 42; and may also partially extend to the bottom of the end cap 42.

[0072] The air-permeable member 43 is respectively connected with the end cap 42 and the shell 41, and there are multiple connection methods. In some embodiments, the air-permeable member 43 is connected with the end cap 42 and the shell 41 by chemical bonds; in some embodiments, the air-permeable frame is connected with the end cap 42 and the shell 41 by mechanical structure; in some embodiments, the air-permeable member 43 is connected with the end cap 42 by chemical bonds, and is connected with the shell 41 by mechanical structure; in some embodiments, the air-permeable member 43 is connected with the end cap 42 by mechanical structure, and is connected with the shell 41 by chemical bonds. In other embodiments, the connection between the air-permeable member 43 and the end cap 42 and the shell 41 is connected by mechanical structure, and chemical bonding strengthens the matching strength. Chemical bond connection includes but is not limited to friction hot melt, spray bonding, dry composite process, thermal composite process and the like.

[0073] The ventilation component 43 is configured so that when the air pressure inside the battery cell 40 is greater than the air pressure outside the battery cell 40, the internal gas is released to the outside through the ventilation component 43; when the voltage inside and outside the battery cell 40 is similar, the ventilation component 43 will not allow the gas inside and outside the battery cell 40 to communicate with each other so that air pollutes the interior of the battery cell 40.

[0074] In the above technical solution, the air-permeable member 43 is configured to be at least partially located between the metal end cap 42 and the shell 41, and is respectively connected with the metal end cap 42 and the shell 41. When the air pressure inside the battery cell 40 is greater than the air pressure outside the battery cell 40, the internal gas is released to the outside through the air-permeable member 43. Thus, the gas generated during the use of the battery cell 40 can be discharged, reducing the expansion deformation of the battery cell 40 caused by gas generation, and improving the safety performance of the battery cell 40; at the same time, the air-permeable member 43 is respectively connected with the metal end cap 42 and the shell 41, replacing the welding of the metal end cap 42 and the shell 41, avoiding the generation of burrs or metal chips during the welding process, thereby reducing the possibility of internal short of the battery cell 40 and improving the safety performance of the battery cell 40.

[0075] Please refer to Figure 6 , Figure 7 and Figure 8 , Figure 6 In another embodiment of the present application Figure 4 The enlarged view at C, Figure 7 In one embodiment of the present application Figure 3 The cross-sectional view at BB, Figure 8 In one embodiment of the present application Figure 7 Enlarged view at D. A first recessed portion is provided on the surface of the air-permeable member 43 facing the end cap 42. A first protruding portion 421 is provided on the outer periphery of the end cap 42. At least a portion of the first protruding portion 421 is accommodated in the first recessed portion.

[0076] The outer periphery may be an end surface surrounding the outside of the end cover 42 .

[0077] The first concave portion can be in various shapes, and the first convex portion 421 can also be in various shapes. The first concave portion and the first convex portion 421 can be interference fit, gap 33 fit, or just fit; the first concave portion and the first convex portion 421 can also be connected by a chemical bond.

[0078] In the above technical solution, the first recessed portion of the air-permeable component 43 is cooperatively connected with the first raised portion 421 of the end cover 42, thereby increasing the matching area between the air-permeable component 43 and the end cover 42, and limiting the relative movement of the air-permeable component 43 and the end cover 42 by clamping the raised portion and the recessed portion, thereby improving the structural stability between the end cover 42 and the air-permeable component 43; mechanical structure cooperation connection or chemical bond connection is used to replace welding, thereby avoiding the generation of welding slag such as metal chips, reducing the possibility of internal short of the battery cell 40, and improving the safety performance of the battery cell 40.

[0079] Continue to refer to Figure 6 , Figure 8 The air-permeable member 43 includes a first surrounding portion 431, a first connecting portion 433, and a second surrounding portion 432. The first surrounding portion 431 surrounds the side of the shell 41 facing the end cover 42. The second surrounding portion 432 surrounds the side of the shell 41 away from the end cover 42. The first connecting portion 433 is attached to the end surface of the shell 41 surrounding the opening 411, and is used to connect the first surrounding portion 431 and the second surrounding portion 432. The first surrounding portion 431, the second surrounding portion 432 and the first connecting portion 433 jointly define a receiving space. The shell 41 includes an inserting portion 412. The inserting portion 412 is received in the receiving space.

[0080] Surrounding may refer to another object forming a ring or a quasi-ring structure around a certain object as the center. Facing may refer to facing or heading toward, and turning away may refer to turning away from. The first surrounding portion 431 and the second surrounding portion 432 surround the inner and outer sides of the shell 41 respectively. The cross-sections of the first surrounding portion 431 and the second surrounding portion 432 may be in various shapes. The first surrounding portion 431 surrounds the side of the shell 41 facing the end cover 42, i.e., the inner side of the shell 41; the second surrounding portion 432 surrounds the side of the shell 41 facing away from the end cover 42, i.e., the outer side of the shell 41.

[0081] The first connecting portion 433 can be in various shapes, and is used to connect the first surrounding portion 431 and the second surrounding portion 432, and is attached to the end surface of the housing 41 surrounding the opening 411. Abutment can refer to the surface of one object attached to another object. In some embodiments of the present application, the first connecting portion 433 is attached to the end surface of the housing 41 surrounding the opening 411.

[0082] The accommodation space may be a region that can accommodate objects. An accommodation space may be formed between the first surrounding portion 431, the second surrounding portion 432 and the connecting portion. The insertion portion 412 may be a portion of the housing 41 located in the accommodation space.

[0083] In the above technical solution, the first surrounding portion 431 surrounds the side of the shell 41 facing the end cover 42, the second surrounding portion 432 surrounds the side of the shell 41 away from the end cover 42, and the first connecting portion 433 abuts against the end surface of the shell 41 surrounding the opening 411, and is used to connect the first surrounding portion 431 and the second surrounding portion 432. The first surrounding portion 431 is used to release the internal gas to the outside through the first surrounding portion 431 when the air pressure inside the battery cell 40 is greater than the air pressure outside the battery cell 40, thereby reducing the expansion deformation of the battery cell 40 caused by gas production and improving the safety performance of the battery cell 40; increasing the matching area of ​​the air permeable component 43 and the shell 41, and improving the structural stability between the air permeable component 43 and the shell 41; replacing welding with mechanical structure matching connection or chemical bond connection, avoiding the generation of welding slag such as metal chips, reducing the possibility of internal short of the battery cell 40, and improving the safety performance of the battery cell 40.

[0084] Continue to refer to Figure 6 , Figure 8 The first surrounding portion 431 and the second surrounding portion 432 are used to clamp the insertion portion 412 .

[0085] The clamping may be that the first surrounding portion 431 and the second surrounding portion 432 apply forces to the insertion portion 412 from both sides respectively, so as to limit the insertion portion 412 from moving to both sides, thereby achieving the effect of fixing the insertion portion 412 .

[0086] In the above technical solution, the first surrounding portion 431 and the second surrounding portion 432 are used to clamp the insertion portion 412, thereby limiting the movement of the shell 41 in a direction parallel to the end cover 42, thereby improving the structural stability.

[0087] Continue to refer to Figure 6 , Figure 8 The inserting portion 412 has a second protruding portion 4121 protruding outward. The second surrounding portion 432 has a second recessed portion arranged opposite to the second protruding portion 4121. At least a portion of the second protruding portion 4121 is accommodated in the second recessed portion.

[0088] The second protrusion 4121 can be an annular structure, that is, a protrusion located on the second surrounding portion 432 and extending toward the insertion portion 412. The second recessed portion is located in the insertion portion 412 and cooperates with the second protrusion 4121. The second protrusion 4121 and the second recessed portion can have the same shape or different shapes. The second protrusion 4121 and the second recessed portion can be connected by a mechanical structure or by a chemical bond. The second protrusion 4121 and the second recessed portion can be interference fit or clearance fit.

[0089] At least a portion of the second protrusion 4121 is accommodated in the second recess, that is, the second protrusion 4121 may be fully accommodated in the second recess, or may be partially accommodated in the second recess.

[0090] In the above technical solution, the second protrusion 4121 cooperates with the second recessed portion, thereby limiting the movement of the shell 41 in a direction perpendicular to the end cover 42, thereby improving the structural stability.

[0091] Reference Figure 6 The air-permeable member 43 includes at least one second connection portion 434 located in the accommodation space. The insertion portion 412 has at least one through hole. The second connection portion 434 is configured to pass through the through hole to connect the first surrounding portion 431 and the second surrounding portion 432.

[0092] At least one second connection part 434 may mean that there may be one or more second connection parts 434. The second connection part 434 is a structure connecting the first surrounding part 431 and the second surrounding part 432. When there are multiple second connection parts 434, the stability of the structure is better. The second connection part 434 may be of various shapes. The second connection part 434 may be formed by partial heat treatment to achieve hot melt welding.

[0093] The through hole is located in the insertion part 412 so that when hot-melt welding is performed, the material of the air-permeable member 43 can enter the through hole from both sides of the through hole to achieve hot-melt welding. There can be one or more through holes, and the number of through holes can be equal to or more than the second connecting part 434.

[0094] The second connection portion 434 is configured to pass through the through hole to connect the first surrounding portion 431 and the second surrounding portion 432 , and the air-permeable member 43 has at least one second connection portion 431 , and the insertion portion 412 has at least one through hole, thereby improving the structural stability between the air-permeable member 43 and the shell 41 .

[0095] Reference Figure 6 A plurality of through holes are distributed at intervals in a plurality of regions of the insertion portion along the circumferential direction of the opening, and each through hole corresponds to a second connecting portion.

[0096] In the above technical solution, a plurality of second connecting portions are provided and spaced apart along the circumference of the opening, thereby further improving the structural stability between the air-permeable component and the shell.

[0097] Reference Figure 8 The air-permeable member 43 and the end cap 42 are connected by chemical bonds.

[0098] Chemical bond connection includes but is not limited to one or more of polishing, friction hot melting, spray bonding, dry composite process, thermal composite process and the like.

[0099] In some embodiments, reference Figure 1 and Figure 6 In the above technical solution, the air-permeable member 43 and the end cover 42 are connected by chemical bonds, which has better structural stability than simple interference fit. Chemical bonds are used instead of welding to avoid the generation of metal chips and other welding slag, reduce the possibility of internal short circuits in the battery cell 40, and improve the safety performance of the battery cell 40.

[0100] The battery cell 40 may include a shell 41, an end cover 42 and a breathable member 43. The shell 41 has an opening 411. The end cover 42 is used to cover the opening 411. The breathable member 43 includes a first surrounding portion 431, which surrounds the side of the shell 41 facing the end cover 42. The first surrounding portion 431 is provided with a first recessed portion on the side facing the end cover 42, and the outer periphery of the end cover 42 is provided with a first protrusion 421, and at least part of the first protrusion 421 is accommodated in the first recessed portion. The first surrounding portion 431 is chemically bonded to the end cover 42. The breathable member 43 includes a second surrounding portion 432 and a first connecting portion 433, the second surrounding portion 432 surrounds the side of the shell 41 away from the end cover 42, and the first connecting portion 433 is attached to the end surface of the shell 41 surrounding the opening 411, and is used to connect the first surrounding portion 431 and the second surrounding portion 432. The first surrounding portion 431, the second surrounding portion 432 and the first connecting portion 433 jointly define a storage space. The housing 41 includes an inserting portion 412, and the inserting portion 412 is accommodated in the storage space. The first surrounding portion 431 and the second surrounding portion 432 are used to clamp the inserting portion 412. The inserting portion 412 has a second protruding portion 4121 protruding outward. The second surrounding portion 432 has a second recessed portion arranged opposite to the second protruding portion 4121. At least part of the second protruding portion 4121 is accommodated in the second recessed portion. The air-permeable member 43 includes at least one second connecting portion 434 located in the storage space. The inserting portion 412 has at least one through hole. The second connecting portion 434 is configured to pass through the through hole to connect the first surrounding portion 431 and the second surrounding portion 432. A plurality of through holes are distributed in a plurality of regions of the inserting portion 412 at intervals along the circumference of the opening 411, and each through hole corresponds to a second connecting portion 434.

[0101] Reference Fig. 9 , Fig.10 , Fig. 9 is a schematic diagram of the exploded structure of a battery 20 disclosed in one embodiment of the present application, Fig.10 yes Fig. 9 A battery 20 includes a housing 21 and a battery cell 40 accommodated in the housing 21.

[0102] The box body 21 is used to provide a receiving cavity 22 for the battery cell 40 , and the box body 21 can adopt various structures.

[0103] In some embodiments, the box body 21 may include a first portion 211 and a second portion 212, the first portion 211 and the second portion 212 cover each other, and the first portion 211 and the second portion 212 jointly define a receiving chamber 22 for receiving the battery cell 40. The second portion 212 may be a hollow structure with an opening 411 at one end, and the first portion 211 may be a plate-like structure, and the first portion 211 covers the opening 411 side of the second portion 212, so that the first portion 211 and the second portion 212 jointly define the receiving chamber 22; the first portion 211 and the second portion 212 may also be hollow structures with an opening 411 at one side, and the opening 411 side of the first portion 211 covers the opening 411 side of the second portion 212. Of course, the box body 21 formed by the first portion 211 and the second portion 212 may be in various shapes, such as a cylinder, a cuboid, etc.

[0104] In the battery 20, there may be multiple battery cells 40, and the multiple battery cells 40 may be connected in series, in parallel, or in mixed connection. Mixed connection means that the multiple battery cells 40 are both connected in series and in parallel. The multiple battery cells 40 may be directly connected in series, in parallel, or in mixed connection, and then the whole formed by the multiple battery cells 40 is accommodated in the box 21; of course, the multiple battery cells 40 may be first connected in series, in parallel, or in mixed connection to form a battery module, and then the multiple battery modules are connected in series, in parallel, or in mixed connection to form a whole, and then accommodated in the box 21.

[0105] Reference Fig.10 In some embodiments, the battery includes at least two battery cells 40, a heat insulator 31 and a support member 32. The heat insulator 31 is disposed between two adjacent battery cells 40. The support member 32 is supported between two adjacent battery cells 40 and abuts against the end of the heat insulator 31 away from the end cover 42. The two second surrounding portions 432 of the two adjacent battery cells 40 abut against the heat insulator 31 from both sides, so that a gap 33 is formed between the heat insulator 31 and the shell 41.

[0106] The heat insulating member 31 may be a heat insulating material, and is used to isolate the battery cell 40 when the battery cell 40 fails due to heat, so as to prevent the failure from affecting other surrounding battery cells 40 .

[0107] The support member 32 may be made of a high temperature resistant material. The abutment may be a mutual force between two objects so that the two objects are directly or indirectly connected. The support member 32 and the heat insulating member 31 abut against each other.

[0108] In the above technical solution, the thermal insulation pad, the second surrounding portion 432 and the frame cooperate to form a gap 33 between the thermal insulation pad and the shell 41, thereby improving the thermal insulation performance of the battery 20, preventing the thermal failure of a single battery cell 40 from affecting other surrounding battery cells 40, and thereby improving the safety performance of the battery 20.

[0109] A third aspect of the present application provides an electrical device.

[0110] Electrical equipment may be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, electric tools, and the like. Vehicles may be fuel vehicles, gas vehicles, or new energy vehicles, and new energy vehicles may be pure electric vehicles, hybrid vehicles, or extended-range vehicles, and the like; spacecraft include airplanes, rockets, space shuttles, and spacecraft, and the like; electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, and the like; electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools, and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, and the like. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical equipment.

[0111] For the convenience of description, the following embodiments are described by taking the electric device as a vehicle as an example.

[0112] Please refer to Fig.11 , Fig.11 The schematic diagram of the structure of the vehicle 10 provided in some embodiments of the present application. The vehicle 10 is provided with a battery 20 inside, and the battery 20 can be provided at the bottom, head, or tail of the vehicle 10. The battery 20 can be used to power the vehicle 10, for example, the battery 20 can be used as an operating power source for the vehicle 10.

[0113] The vehicle 10 may further include a controller 11 and a motor 12 . The controller 11 is used to control the battery 20 to supply power to the motor 12 , for example, to meet the power requirements of starting, navigating, and driving the vehicle 10 .

[0114] In some embodiments of the present application, the battery 20 can not only serve as an operating power source for the vehicle 10 , but also serve as a driving power source for the vehicle 10 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 10 .

[0115] The present application embodiment provides a method for manufacturing a battery cell 40, please refer to Fig.12 FIG. 12 is a flow chart of a method for manufacturing a battery cell 40 provided in some embodiments of the present application, the manufacturing method comprising:

[0116] S100: providing a housing 41, wherein the housing 41 has an opening 411;

[0117] S200: Providing an end cover 42, wherein the material of the end cover 42 is metal;

[0118] S300: Providing a breathable member 43;

[0119] S400: Fixing the air-permeable member 43 to the outer periphery of the end cover 42;

[0120] S500 : Cover the end cover 43 on the opening 411 .

[0121] Among them, at least part of the breathable component 43 is located between the end cover 42 and the shell 41, and the breathable component 43 is respectively connected to the end cover 42 and the shell 41. The breathable component 43 is configured so that when the air pressure inside the battery cell 40 is greater than the air pressure outside the battery cell 40, the internal gas is released to the outside through the breathable component 43.

[0122] In the above method, the order of step S100, step S200 and step S300 is not limited. For example, step S300 may be performed first, then step S200, and then step S100.

[0123] It should be noted that the relevant structure of the battery cell 40 manufactured by the manufacturing method provided by the above embodiments can refer to the battery cell 40 provided by the above embodiments, and will not be described in detail here.

[0124] In addition, the present application also provides a manufacturing device 2000 for a battery cell 40, please refer to Fig.13 , Fig.13 It is a schematic block diagram of a manufacturing device 2000 for a battery cell 40 provided in some embodiments of the present application. The manufacturing device 2000 includes a first providing device 2100 , a second providing device 2200 , a third providing device 2300 and an assembling device 2400 .

[0125] The first providing device 2100 is used to provide a housing 41, and the housing 41 has an opening 411. The second providing device 2200 is used to provide an end cap 42, and the material of the end cap 42 is metal. The third providing device 2300 is used to provide a gas-permeable member 43. The assembling device 2400 is used to fix the gas-permeable member 43 to the outer periphery of the end cap 42, and to cover the end cap 42 to the opening 411.

[0126] Among them, at least part of the breathable component 43 is located between the end cover 42 and the shell 41, and the breathable component 43 is respectively connected to the end cover 42 and the shell 41. The breathable component 43 is configured so that when the air pressure inside the battery cell 40 is greater than the air pressure outside the battery cell 40, the internal gas is released to the outside through the breathable component 43.

[0127] It should be noted that the relevant structure of the battery cell 20 manufactured by the manufacturing equipment 2000 provided by the above embodiment can refer to the battery cell 20 provided by the above embodiments, and will not be repeated here.

[0128] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0129] The above embodiments are only used to illustrate the technical solution of the present application and are not used to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery cell, characterized in that: include: a housing having an opening; An end cover, used to cover the opening, wherein the end cover is made of metal; a ventilation member, at least partially located between the end cover and the shell, the ventilation member being cooperatively connected with the end cover and the shell respectively, and the ventilation member being configured such that when the gas pressure inside the battery cell is greater than the gas pressure outside the battery cell, the gas inside is released to the outside through the ventilation member; The breathable component includes a first surrounding portion, a first connecting portion and a second surrounding portion, the first surrounding portion surrounds a side of the shell facing the end cover, the second surrounding portion surrounds a side of the shell away from the end cover, the first connecting portion is attached to the end surface of the shell surrounding the opening, and is used to connect the first surrounding portion and the second surrounding portion, the first surrounding portion, the second surrounding portion and the first connecting portion jointly define a accommodating space; the shell includes an insertion portion, and the insertion portion is accommodated in the accommodating space.

2. The battery cell according to claim 1, characterized in that: The air-permeable member is provided with a first recessed portion on a side facing the end cover, and a first protruding portion is provided on an outer periphery of the end cover, and at least a portion of the first protruding portion is accommodated in the first recessed portion.

3. The battery cell according to claim 1, characterized in that: The first surrounding portion and the second surrounding portion are used to clamp the insertion portion.

4. The battery cell according to claim 1, characterized in that: The inserting portion has a second protruding portion protruding outward, and the second surrounding portion has a second recessed portion arranged opposite to the second protruding portion, and at least a part of the second protruding portion is accommodated in the second recessed portion.

5. The battery cell according to claim 1 or 3, characterized in that: The air-permeable member includes at least one second connection portion located in the accommodation space, the insertion portion has at least one through hole, and the second connection portion is configured to pass through the through hole to connect the first surrounding portion and the second surrounding portion.

6. The battery cell according to claim 5, characterized in that: The plurality of through holes are distributed at intervals in a plurality of regions of the insertion portion along the circumferential direction of the opening, and each of the through holes corresponds to one of the second connecting portions.

7. The battery cell according to claim 1, characterized in that: The air-permeable component is connected to the end cover by chemical bonds.

8. A battery, characterized in that: A battery cell according to any one of claims 1 to 7 comprising a case and the battery cell accommodated in the case.

9. The battery according to claim 8, characterized in that include: At least two battery cells according to any one of claims 1 to 7; A heat insulating member, disposed between two adjacent battery cells; The support member is supported between two adjacent battery cells and abuts against the end of the thermal insulation member away from the end cover. The two second surrounding portions of the two adjacent battery cells abut against the thermal insulation member from both sides to form a gap between the thermal insulation member and the shell.

10. An electrical device, characterized in that: Comprising the battery of claim 8 or 9.

11. A method for manufacturing a battery cell, characterized in that: include: providing a housing having an opening; Providing an end cover, wherein the end cover is made of metal; providing a breathable member; fixing the air-permeable member to the outer periphery of the end cover; Covering the end cover on the opening; Wherein, at least a portion of the air-permeable member is located between the end cover and the shell, the air-permeable member is respectively connected to the end cover and the shell, and the air-permeable member is configured so that when the air pressure inside the battery cell is greater than the air pressure outside the battery cell, the internal gas is released to the outside through the air-permeable member; the air-permeable member includes a first surrounding portion, a first connecting portion, and a second surrounding portion, the first surrounding portion surrounds a side of the shell facing the end cover, the second surrounding portion surrounds a side of the shell away from the end cover, the first connecting portion is attached to the end surface of the shell surrounding the opening, and is used to connect the first surrounding portion and the second surrounding portion, the first surrounding portion, the second surrounding portion and the first connecting portion jointly define a accommodating space; the shell includes an insertion portion, and the insertion portion is accommodated in the accommodating space.

12. A battery cell manufacturing device, characterized in that: include: A first providing device, for providing a housing, wherein the housing has an opening; A second providing device is used to provide an end cap, wherein the end cap is made of metal; A third providing device for providing a breathable member; as well as An assembling device, used to fix the air-permeable member to the outer periphery of the end cover, and the assembling device is also used to cover the end cover to the opening; Wherein, at least a portion of the air-permeable member is located between the end cover and the shell, the air-permeable member is respectively connected to the end cover and the shell, and the air-permeable member is configured so that when the air pressure inside the battery cell is greater than the air pressure outside the battery cell, the internal gas is released to the outside through the air-permeable member; the air-permeable member includes a first surrounding portion, a first connecting portion, and a second surrounding portion, the first surrounding portion surrounds a side of the shell facing the end cover, the second surrounding portion surrounds a side of the shell away from the end cover, the first connecting portion is attached to the end surface of the shell surrounding the opening, and is used to connect the first surrounding portion and the second surrounding portion, the first surrounding portion, the second surrounding portion and the first connecting portion jointly define a accommodating space; the shell includes an insertion portion, and the insertion portion is accommodated in the accommodating space.

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