CN116093533A - Battery cell, battery, power utilization device, and manufacturing equipment and method of battery cell - Google Patents

Abstract

The embodiment of the application provides a battery monomer, a battery, an electric device and manufacturing equipment and method of the battery monomer, wherein the battery monomer comprises: a housing, an end cap, and a venting member. The housing has an opening. The end cap is used for covering the opening. The end cover is made of metal. The gas permeable member is at least partially located between the end cap and the housing. The ventilation component is respectively connected with the end cover and the shell in a matching way. The ventilation member is configured such that when the air pressure inside the battery cell is greater than the air pressure outside the battery cell, the air inside the battery cell is released to the outside through the ventilation member, so that the expansion deformation of the battery cell caused by the air generation is reduced, and the safety performance of the battery cell is improved; the ventilation member is used for connecting the metal end cover with the shell to replace the welding of the metal end cover and the shell, so that the possibility of short inside the battery cell is reduced, and the safety performance of the battery cell is improved.

Description

Battery cell, battery, power utilization device, and manufacturing equipment and method of battery cell

Technical Field

The present disclosure relates to the field of battery technologies, and in particular, to a battery cell, a battery, an electric device, and a manufacturing apparatus and method for the battery cell.

Background

The power battery has a high energy density and is environmentally friendly, and is widely used in electronic devices such as mobile phones and notebook computers. In recent years, in order to cope with environmental problems, gasoline price problems, and energy storage problems, the application of power batteries has been rapidly expanded to hybrid electric vehicles, ships, energy storage systems, and the like.

In addition to improving the performance of the battery cells, safety issues are also a concern in the development of power cell technology. Therefore, how to improve the safety of the battery cell is a problem to be solved in the battery technology.

Disclosure of Invention

The application provides a battery monomer, a battery, electric equipment and manufacturing equipment and method of the battery monomer, which are used for improving the safety performance of the battery monomer.

A first aspect of the present application provides a battery cell comprising: a housing, an end cap, and a venting member. The housing has an opening. The end cap is used for covering the opening. The end cover is made of metal. The gas permeable member is at least partially located between the end cap and the housing. The ventilation component is respectively connected with the end cover and the shell in a matching way. The gas permeable member is 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 gas permeable member.

In the above technical scheme, the ventilation member is configured to be at least partially located between the metal end cover and the shell, and is respectively connected with the metal end cover and the shell in a matched manner, when the air pressure inside the battery cell is greater than the air pressure outside the battery cell, the air inside the battery cell is released to the outside through the ventilation member. Therefore, the gas generated in the use process of the battery monomer is discharged, the expansion deformation of the battery monomer caused by gas production is reduced, and the safety performance of the battery monomer is improved; meanwhile, the ventilation component is respectively matched and connected with the metal end cover and the shell to replace welding of the metal end cover and the shell, burrs or metal scraps are avoided to a certain extent in the welding process, so that the possibility of internal short circuit of the battery cell is reduced, and the safety performance of the battery cell is improved.

In some embodiments, the venting member is provided with a first recess on a side facing the end cap. The periphery of the end cover is provided with a first protruding part. At least part of the first protruding portion is accommodated in the first recessed portion.

In the technical scheme, the first concave part of the ventilation member is matched and connected with the first convex part of the end cover, so that the matching area of the ventilation member and the end cover is increased, the relative movement of the ventilation member and the end cover is limited through the clamping connection of the convex part and the concave part, and the structural stability between the end cover and the ventilation member is improved; the welding is replaced by the mechanical structure matched connection or chemical bond connection, so that welding slag such as metal scraps is avoided, the possibility of short inside the battery cell is reduced, and the safety performance of the battery cell is improved.

In some embodiments, the ventilation member includes a first surrounding portion, a first connecting portion, and a second surrounding portion. The first surrounding part surrounds one side of the shell facing the end cover. The second surrounding part surrounds one side of the shell, which is away from the end cover. The first connecting portion is attached to an end face of the housing surrounding the opening, and is used for connecting the first surrounding portion and the second surrounding portion. The first surrounding portion, the second surrounding portion and the first connecting portion together define an accommodating space. The housing includes an insertion portion. The insertion portion is accommodated in the accommodation space.

In the above technical scheme, the first surrounding part surrounds one side of the shell facing the end cover, the second surrounding part surrounds one side of the shell facing away from the end cover, and the first connecting part is abutted to the end face of the surrounding opening of the shell and is used for connecting the first surrounding part and the second surrounding part. The first surrounding part is used for releasing the internal gas to the outside through the first surrounding part when the internal gas pressure of the battery cell is greater than the external gas pressure of the battery cell, so that the expansion deformation of the battery cell caused by gas production is reduced, and the safety performance of the battery cell is improved; the matching area of the ventilation component and the shell is increased, and the structural stability between the ventilation component and the shell is improved; the welding is replaced by the mechanical structure matched connection or chemical bond connection, so that welding slag such as metal scraps is avoided, the possibility of internal short circuit of the battery cell is reduced, and the safety performance of the battery cell is improved.

In some embodiments, the first and second surrounds are used to grip the insert.

In the technical scheme, the first surrounding part and the second surrounding part are used for clamping the inserting part, so that the movement of the shell in the direction parallel to the end cover is limited, and the structural stability is improved.

In some embodiments, the insert has a second protrusion protruding outward. The second surrounding part is provided with a second concave part which is arranged opposite to the second convex part. At least part of the second protruding portion is accommodated in the second recessed portion.

In the technical scheme, the second protruding portion is matched with the second recessed portion, so that the shell is limited to move in the vertical direction of the end cover, and the shell is limited to move relative to the ventilation member through the matching of the protruding portion and the recessed portion, and structural stability is improved.

In some embodiments, the gas permeable member includes at least one second connection located within the receiving space. The insertion portion has at least one through hole. The second connection portion is configured to pass through the through hole to connect the first surrounding portion and the second surrounding portion.

In the technical scheme, the second connecting part is configured to penetrate through the through hole to connect the first surrounding part and the second surrounding part, the ventilation member is provided with at least one second connecting part, and the insertion part is provided with at least one through hole, so that the structural stability between the ventilation member and the shell is improved.

In some embodiments, the plurality of through holes are distributed in a plurality of areas of the insertion portion at intervals along the circumferential direction of the opening, and each through hole corresponds to one second connection portion.

In the technical scheme, a plurality of second connecting parts are arranged and are arranged at intervals along the circumferential direction of the opening, so that the structural stability between the ventilation member and the shell is further improved.

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

In the technical scheme, the ventilation member and the end cover are connected through chemical bonds, so that the structure stability is better compared with simple interference fit; the welding is replaced by chemical bond connection, so that welding slag such as metal scraps is avoided, the possibility of internal short of the battery monomer is reduced, and the safety performance of the battery monomer is improved.

A second aspect of the present application provides a battery comprising a case and a battery cell housed in the case.

In some embodiments, the battery includes at least two battery cells, a thermal shield, and a support. The heat insulating piece is arranged between two adjacent battery monomers. The support piece is supported between two adjacent battery cells and is abutted to the end part of the heat insulation piece, which is far away from the end cover. The two second surrounding parts of the two adjacent battery cells are propped against the heat insulation piece from two sides, so that a gap is formed between the heat insulation piece and the shell.

In the above technical scheme, the heat insulating piece is matched with the second surrounding part and the supporting piece to form a gap between the heat insulating piece and the shell, so that the heat insulating performance of the battery is improved, other battery monomers around the battery are prevented from being affected after the single battery monomer is thermally invalid, and the safety performance of the battery is further provided.

A third aspect of the present application provides an electrical device comprising a battery as provided in the second aspect of the present application.

A fourth aspect of the present application provides a method for manufacturing a battery cell, including: providing a housing having an opening; providing an end cover, wherein the end cover is made of metal; providing a gas permeable member; fixing the ventilation member to the outer periphery of the end cap; covering the end cover on the opening; wherein, at least part of ventilation component is located between end cover and the casing, and ventilation component is connected with end cover, casing cooperation respectively, and ventilation component is configured to when the inside atmospheric pressure of battery cell is greater than the outside atmospheric pressure of battery cell, and inside gas releases to outside through ventilation component.

A fifth aspect of the present application provides an apparatus for manufacturing a battery cell, comprising: first providing means for providing a housing having an opening; the second providing device is used for providing an end cover, and the end cover is made of metal; third providing means for providing a gas permeable member; and an assembling device for fixing the ventilation member to the outer periphery of the end cover and for covering the end cover to the opening; wherein, at least part of ventilation component is located between end cover and the casing, and ventilation component is connected with end cover, casing cooperation respectively, and ventilation component is configured to when the inside atmospheric pressure of battery cell is greater than the outside atmospheric pressure of battery cell, and inside gas releases to outside through ventilation component.

The utility model provides a battery monomer, battery, power consumption device and battery monomer's manufacture equipment and method, in the battery monomer, dispose ventilative component to be located between metal end cover and the casing at least partially, be connected with metal end cover, casing cooperation respectively, when the inside atmospheric pressure of battery monomer is greater than the outside atmospheric pressure of battery monomer, inside gas releases to outside through ventilative component. Therefore, the gas generated in the use process of the battery monomer is discharged, the expansion deformation of the battery monomer caused by gas production is reduced, and the safety performance of the battery monomer is improved; meanwhile, the ventilation component is respectively connected with the metal end cover and the shell in a matched manner to replace welding of the metal end cover and the shell, burrs or metal scraps are avoided in the welding process, the possibility of short inside the battery cell is reduced, and the safety performance of the battery cell is improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments of the present application will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present application, and that other drawings may be obtained according to the drawings without inventive effort for a person skilled in the art.

FIG. 1 is an exploded view of a battery cell as disclosed in one embodiment of the present application;

FIG. 2 is an isometric view of a battery cell disclosed in an embodiment of the present application;

FIG. 3 is a top view of a battery cell disclosed in an embodiment of the present application;

FIG. 4 is a cross-sectional view at A-A of FIG. 3 in an embodiment of the present application;

FIG. 5 is an enlarged view of FIG. 4 at C in an embodiment of the present application;

FIG. 6 is an enlarged view of FIG. 4 at C in another embodiment of the present application;

FIG. 7 is a cross-sectional view of FIG. 3 at B-B in an embodiment of the present application;

FIG. 8 is an enlarged view of FIG. 7 at D in an embodiment of the present application;

fig. 9 is a schematic view showing an exploded structure of a battery according to an embodiment of the present application;

FIG. 10 is an enlarged view of a portion of FIG. 9;

FIG. 11 is a schematic illustration of a vehicle according to an embodiment of the present disclosure;

FIG. 12 is a flow chart of a method of manufacturing a battery cell as disclosed in one embodiment of the present application;

fig. 13 is a schematic block diagram of a battery cell manufacturing apparatus disclosed in an embodiment of the present application;

in the drawings, the drawings are not drawn to scale.

Marking:

10-vehicle, 11-controller, 12 motor;

20-battery, 21-box, 211-first part, 212-second part, 22-accommodation cavity;

31-heat insulator, 32-support, 33-gap;

40-battery cell, 41-housing, 411-opening, 412-insertion portion, 4121-second protrusion portion, 42-end cap, 421-first protrusion portion, 43-ventilation member, 431-first surrounding portion, 432-second surrounding portion, 433-first connection portion, 434-second connection portion;

2000-manufacturing equipment; 2100-first providing means; 2200-a second providing means; 2300-third providing means; 2400-assembly device.

Detailed Description

For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.

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 in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having" and any variations thereof in the description and claims of the present application and in the description of the figures above are intended to cover non-exclusive inclusions. The terms first, second and the like in the description and in the claims or in the above-described figures, are used for distinguishing between different objects and not necessarily for describing a particular sequential or chronological order.

Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of such phrases 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.

In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "attached" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.

The term "and/or" in this application is merely an association relation describing an associated object, and indicates that three relations may exist, for example, a and/or B may indicate: a exists alone, A and B exist together, and B exists alone. In this application, the character "/" generally indicates that the associated object is an or relationship.

In the embodiments of the present application, the same reference numerals denote the same components, and in the interest of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, etc. dimensions of the various components in the embodiments of the present application, as well as the overall thickness, length, width, etc. dimensions of the integrated device, are illustrative only and should not be construed as limiting the present application in any way.

The term "plurality" as used herein refers to more than two (including two).

In the present application, the battery cell may include a lithium ion secondary battery, a lithium ion primary battery, a lithium sulfur battery, a sodium lithium ion battery, a sodium ion battery, a magnesium ion battery, or the like, which is not limited by the embodiment of the present application. The battery cells may be cylindrical, flat, rectangular, or otherwise shaped, as well as the embodiments herein are not limited in this regard. The battery cells are generally classified into three types according to the packaging method: the cylindrical battery cell, the square battery cell and the soft pack battery cell are not limited thereto.

Reference to a battery in embodiments of the present application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in the present application may include a battery module or a battery pack, or the like. The battery generally includes a case for enclosing one or more battery cells. The case body can prevent liquid or other foreign matters from affecting the charge or discharge of the battery cells.

The battery cell comprises an electrode assembly and electrolyte, wherein the electrode assembly consists of a positive plate, a negative plate and a separation membrane. The battery cell mainly relies on metal ions to move between the positive and negative electrode plates to operate. The positive plate comprises a positive electrode current collector and a positive electrode active material layer, wherein the positive electrode active material layer is coated on the surface of the positive electrode current collector, the positive electrode current collector without the positive electrode active material layer protrudes out of the positive electrode current collector coated with the positive electrode active material layer, and the positive electrode current collector without the positive electrode active material layer is used as a positive electrode lug. Taking a lithium ion battery as an example, the material of the positive electrode current collector may be aluminum, and the positive electrode active material may be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate or the like. The negative electrode sheet comprises a negative electrode current collector and a negative electrode active material layer, wherein the negative electrode active material layer is coated on the surface of the negative electrode current collector, the negative electrode current collector without the negative electrode active material layer protrudes out of the negative electrode current collector coated with the negative electrode active material layer, and the negative electrode current collector without the negative electrode active material layer is used as a negative electrode tab. The material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon, silicon, or the like. In order to ensure that the high current is passed without fusing, the number of positive electrode lugs is multiple and stacked together, and the number of negative electrode lugs is multiple and stacked together. The material of the separator may be PP (polypropylene) or PE (polyethylene). In addition, the electrode assembly may be a wound structure or a lamination structure, and the embodiment of the present application is not limited thereto.

The battery cell may further include a case and an end cap assembly covered on the case to provide a sealed space for the electrode assembly and the electrolyte, the electrode assembly being electrically connected with the electrode terminal of the end cap assembly.

For a general metal top cover battery cell, the interior of the battery cell is a closed space, and welding is generally performed between the metal top cover and the shell.

The inventors have found that a battery cell generally includes a housing, an electrode assembly and electrolyte solution contained within the housing, an end cap connected to the housing, the electrode assembly including a positive electrode tab, a negative electrode tab, and a separator separating the positive and negative electrode tabs. To avoid leakage of electrolyte solution, the end caps typically seal the housing. The battery cell can generate gas in the charging and discharging process, and as the battery cell is internally provided with a closed space, the gas in the battery cell is gradually increased along with the increase of the service time limit of the battery cell, and the internal air pressure is gradually increased, so that the risks of battery deformation and performance deterioration of an electrode assembly are easily caused, and the safety of the battery cell is influenced; in the welding process of the end cover and the shell of the battery cell, burrs or metal scraps can be generated, and the internal short circuit of the battery cell can be possibly caused, so that the safety of the battery cell is influenced.

In view of this, the embodiment of the application proposes a technical solution, through configuring the ventilation component to be at least partially located between the metal end cover and the housing, respectively with the metal end cover, the housing cooperation is connected, when the inside atmospheric pressure of battery cell is greater than the outside atmospheric pressure of battery cell, inside gas releases to outside through ventilation component. Therefore, the gas generated in the use process of the battery monomer is discharged, the expansion deformation of the battery monomer caused by gas production is reduced, and the safety performance of the battery monomer is improved; meanwhile, the ventilation component is respectively connected with the metal end cover and the shell in a matched manner to replace welding of the metal end cover and the shell, burrs or metal scraps are avoided in the welding process, the possibility of internal short circuit of the battery cell is reduced, and the safety performance of the battery cell is improved.

The technical scheme described in the embodiment of the application is suitable for battery cells, batteries, electric equipment using the batteries and manufacturing equipment and method of the battery cells.

Referring to fig. 1, 2, 3, 4 and 5, fig. 1 is an exploded view of a battery cell 40 according to an embodiment of the present application, fig. 2 is an isometric view of a battery cell 40 according to an embodiment of the present application, fig. 3 is a top view of a battery cell 40 according to an embodiment of the present application, fig. 4 is a cross-sectional view of fig. 3 at A-A, and fig. 5 is an enlarged view of fig. 4 at C according to an embodiment of the present application. The present application provides a battery cell 40 comprising: a housing 41, an end cap 42 and a ventilation member 43. The housing 41 has an opening 411. The end cap 42 is used to cover the opening 411. The end cap 42 is made of metal. The air permeable member 43 is at least partially located between the end cap 42 and the housing 41. The ventilation member 43 is connected to the end cap 42 and the housing 41 in a mating manner. The ventilation member 43 is configured such that when the air pressure inside the battery cell 40 is greater than the air pressure outside the battery cell 40, the inside air is released to the outside through the ventilation member 43.

The case 41 may be a case of the battery cell 40 for accommodating the electrode assembly. The case 41 may have various shapes, for example, a hollow cylindrical body, a hollow rectangular body, and the like, and the electrode assembly is accommodated in the accommodation chamber 22 of the hollow rectangular body. The shape of the case 41 may be specifically determined according to the shape of the electrode assembly, for example, if the electrode assembly is a cylindrical structure, the case 41 may be a hollow cylindrical structure; if the electrode assembly has a rectangular parallelepiped structure, the case 41 may have a hollow rectangular parallelepiped structure. The material of the case 41 may be a conductive material such as copper, iron, aluminum, stainless steel, or aluminum alloy, or an insulating material such as plastic or rubber.

The opening 411 may be provided on one or several sides of the housing 41. The opening 411 may be of various shapes, such as rectangular, circular, etc. After the shape of the housing 41 is determined, the shape of the opening 411 is also determined accordingly. Alternatively, if the housing 41 is a hollow cylinder structure, the opening 411 is circular; if the housing 41 is of a hollow rectangular parallelepiped structure, the opening 411 is rectangular. The number of the openings 411 may be one or two. Alternatively, when the opening 411 is one, it may be disposed on any one surface of the hollow rectangular parallelepiped housing 41, or may be disposed on the top surface or the top surface of the hollow cylindrical housing 41; when the number of the openings 411 is two, the openings may be provided on two opposite side surfaces of the hollow rectangular parallelepiped housing 41, or may be provided on the top surface and the bottom surface of the hollow cylindrical housing 41; as the number of openings 411 is greater, the situation may be the case.

The end cap 42 is used to cover the opening 411 of the housing 41. The end cap 42 may be of various shapes such as circular, 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 circular end cap 42 is optional; if the housing 41 is rectangular, a rectangular end cap 42 may be used. The end cap 42 is a carrier for other components such as electrode terminals. The end cap 42 may serve as an output pole of the battery cell 40, outputting a portion of the battery cell 40 that connects with other components and outputs electrical energy of the battery cell 40.

The air permeable member 43 may be one or more of polypropylene, modified polypropylene, polyethylene terephthalate, ethylene propylene copolymer, cast polypropylene, polytetrafluoroethylene, polyvinylidene fluoride, polyacrylonitrile, etc. The ventilation member 43 has ventilation property, and can gradually release the air pressure inside the electric core, so as to avoid the damage to the electric core structure after the air pressure inside the electric core is raised, and the failure is caused.

Referring to fig. 5, in some embodiments, the cross section of the ventilation member 43 may be rectangular or rectangular-like, i.e., the rectangular shape that may be obtained by a certain deformation, and the inner and outer sides of the ventilation member respectively cooperate with the end cover 42 and the housing 41 to complete the fixation.

In other embodiments, the air permeable member 43 may be structurally deformed based on a rectangular, rectangular-like cross section to increase the strength of the mating of the air permeable member 43 with the end cap 42, housing 41, and to increase structural stability.

The air permeable member 43 is at least partially located between the end cap 42 and the housing 41 to perform the function of connecting the end cap 42 and the housing 41. The ventilation member 43 may be partially extended to the outside of the housing 41 to be engaged with the housing 41; or may extend partially to the top of the end cap 42; and may also extend partially to the bottom of the end cap 42.

The ventilation member 43 is respectively connected with the end cover 42 and the housing 41 in a matching way, and various connection modes can be adopted. In some embodiments, the air permeable member 43 is chemically bonded to both the end cap 42 and the housing 41; in some embodiments, the air permeable frame is coupled to both the end cap 42 and the housing 41 by a mechanical arrangement; in some embodiments, the air permeable member 43 is chemically bonded to the end cap 42 and mechanically coupled to the housing 41; in some embodiments, the air permeable member 43 is coupled to the end cap 42 by a mechanical structure fit and coupled to the housing 41 by a chemical bond. In other embodiments, the connection of the air permeable member 43 with the end cap 42 and the housing 41 is through a mechanical structure fit connection, and the chemical bond enhances the fit strength. Chemical bond connection includes, but is not limited to, friction hot melt, spray bonding, dry compounding process, thermal compounding process, and the like.

The gas permeable member 43 is configured such that when the gas pressure inside the battery cell 40 is greater than the gas pressure outside the battery cell 40, the gas inside is released to the outside through the gas permeable member 43; when the voltages of the inside and outside of the battery cell 40 are similar, the ventilation member 43 does not allow the inside and outside of the battery cell 40 to communicate with each other so that air contaminates the inside of the battery cell 40.

In the above technical solution, the ventilation member 43 is disposed at least partially between the metal end cover 42 and the housing 41, and is respectively connected with the metal end cover 42 and the housing 41 in a matching manner, when the air pressure inside the battery cell 40 is greater than the air pressure outside the battery cell 40, the air inside is released to the outside through the ventilation member 43. Thereby the gas generated in the use process of the battery cell 40 is discharged, the expansion deformation of the battery cell 40 caused by gas production is reduced, and the safety performance of the battery cell 40 is improved; meanwhile, the ventilation member 43 is respectively connected with the metal end cover 42 and the shell 41 in a matching way, and replaces welding of the metal end cover 42 and the shell 41, burrs or metal scraps are avoided in the welding process, so that the possibility of short inside the battery cell 40 is reduced, and the safety performance of the battery cell 40 is improved.

Referring to fig. 6, 7 and 8, fig. 6 is an enlarged view of fig. 4 at C, fig. 7 is a cross-sectional view of fig. 3 at B-B, fig. 8 is an enlarged view of fig. 7 at D, according to another embodiment of the present application. The surface of the ventilation member 43 facing the end cap 42 is provided with a first recess. The outer periphery of the end cap 42 is provided with a first boss 421. At least a portion of the first protruding portion 421 is received in the first recessed portion.

The outer periphery may be an end surface that surrounds the exterior of the end cap 42.

The first concave portion may have various shapes, and the first convex portion 421 may have various shapes. The first concave part and the first convex part 421 can be in interference fit and clearance 33 fit, and the first concave part and the first convex part can be just fit; the first concave portion and the first convex portion 421 may be connected by a chemical bond.

In the above technical solution, the first concave portion of the ventilation member 43 is connected with the first convex portion 421 of the end cover 42 in a matching manner, so that the matching area of the ventilation member 43 and the end cover 42 is increased, and the ventilation member 43 and the end cover 42 are limited to move relatively by the engagement of the convex portion and the concave portion, so that the structural stability between the end cover 42 and the ventilation member 43 is improved; the mechanical structure is matched with connection or chemical bond connection to replace welding, so that welding slag such as metal scraps is avoided, the possibility of short inside the battery cell 40 is reduced, and the safety performance of the battery cell 40 is improved.

With continued reference to fig. 6 and 8, the ventilation 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 a side of the housing 41 facing the end cap 42. The second surrounding portion 432 surrounds the side of the housing 41 facing away from the end cap 42. The first connection portion 433 is attached to an end surface of the housing 41 surrounding the opening 411, and serves 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 together define an accommodating space. The housing 41 includes an insertion portion 412. The insertion portion 412 is accommodated in the accommodation space.

Surrounding may refer to centering around an object around which another object forms a ring or ring-like structure. Facing may refer to facing, and facing away may refer to facing away. The first surrounding portion 431 and the second surrounding portion 432 surround the inner and outer sides of the housing 41. The cross-sections of the first surrounding portion 431 and the second surrounding portion 432 may be various shapes. The first surrounding portion 431 surrounds one side of the housing 41 facing the end cover 42, i.e., the inner side of the housing 41; the second surrounding portion 432 surrounds the side of the housing 41 facing away from the end cap 42, i.e., the outside of the housing 41.

The first connection portion 433 may have various shapes for connecting the first surrounding portion 431 and the second surrounding portion 432, and is attached to an end surface of the housing 41 surrounding the opening 411. Abutment may refer to the attachment of one object to the surface of another object. In some embodiments of the present application, the first connection 433 is attached to an end surface of the housing 41 surrounding the opening 411.

The accommodation space may be an area in which the object can be accommodated. A receiving space may be formed between the first surrounding portion 431, the second surrounding portion 432, and the connection portion. The insertion portion 412 may be a portion of the housing 41 located in the receiving space.

In the above-mentioned solution, the first surrounding portion 431 surrounds one side of the housing 41 facing the end cover 42, the second surrounding portion 432 surrounds one side of the housing 41 facing away from the end cover 42, the first connecting portion 433 abuts against an end surface of the surrounding opening 411 of the housing 41, and is used for connecting the first surrounding portion 431 and the second surrounding portion 432. The first surrounding portion 431 is configured to, when the air pressure inside the battery cell 40 is greater than the air pressure outside the battery cell 40, release the air inside to the outside through the first surrounding portion 431, reduce the expansion deformation of the battery cell 40 caused by the air generation, and improve the safety performance of the battery cell 40; the mating area of the ventilation member 43 and the housing 41 is increased, and the structural stability between the ventilation member 43 and the housing 41 is improved; the mechanical structure is matched with connection or chemical bond connection to replace welding, so that welding slag such as metal scraps is avoided, the possibility of short inside the battery cell 40 is reduced, and the safety performance of the battery cell 40 is improved.

With continued reference to fig. 6 and 8, the first surrounding portion 431 and the second surrounding portion 432 are configured to clamp the insertion portion 412.

The clamping may apply a force to the insertion portion 412 from both sides to the first surrounding portion 431 and the second surrounding portion 432, respectively, to restrict the insertion portion 412 from moving to both sides, thereby fixing the insertion portion 412.

In the above-mentioned solution, the first surrounding portion 431 and the second surrounding portion 432 are used to clamp the insertion portion 412, so as to limit the movement of the housing 41 in the direction parallel to the end cover 42, thereby improving structural stability.

With continued reference to fig. 6 and 8, the insertion portion 412 has a second boss 4121 that protrudes outward. The second surrounding portion 432 has a second concave portion disposed opposite to the second convex portion 4121. At least a portion of the second boss 4121 is received in the second recess.

The second boss 4121 may be an annular structure, i.e., a boss located on the second surrounding portion 432, extending toward the insertion portion 412. The second recess is located at the insertion portion 412 and mates with the second protrusion 4121. The second protrusion 4121 and the second recess may have the same shape or may have different shapes. The second protruding portion 4121 and the second recessed portion may be mechanically connected in a matching manner, or may be chemically connected. The second boss 4121 and the second recess may be an interference fit and a clearance 33 fit therebetween.

At least a portion of the second protruding portion 4121 is received in the second recessed portion, that is, the second protruding portion 4121 may be received in the second recessed portion entirely or partially.

In the above-mentioned technical solution, the second protrusion 4121 cooperates with the second recess, so as to limit the movement of the housing 41 in the direction perpendicular to the end cover 42, and improve structural stability.

Referring to fig. 6, the ventilation member 43 includes at least one second connection part 434 located in the receiving space. The insertion portion 412 has at least one through hole. The second connection part 434 is configured to pass through the through hole to connect the first surrounding part 431 and the second surrounding part 432.

The at least one second connection part 434 may mean that the second connection part 434 may have one or more, and the second connection part 434 has a structure for connecting the first surrounding part 431 and the second surrounding part 432, and when there are a plurality of second connection parts 434, the stability of the structure is better. The second connection part 434 may have various shapes. The second connection portion 434 may be formed by a partial heat treatment to implement a heat fusion welding.

The through hole is located at the insertion portion 412 so that the material of the ventilation member 43 can enter the through hole from both sides of the through hole when the heat welding is performed, thereby realizing the heat welding. The number of the through holes may be one or more, and the number of the through holes may be equal to or greater than the second connection part 434.

The second connection part 434 is configured to pass through the through hole to connect the first surrounding part 431 and the second surrounding part 432, and the ventilation member 43 has at least one second connection part 431, and the insertion part 412 has at least one through hole, improving structural stability between the ventilation member 43 and the case 41.

Referring to fig. 6, a plurality of through holes are spaced apart from each other in a circumferential direction of the opening in a plurality of regions of the insertion portion, each through hole corresponding to one of the second connection portions.

In the technical scheme, a plurality of second connecting parts are arranged and are arranged at intervals along the circumferential direction of the opening, so that the structural stability between the ventilation member and the shell is further improved.

Referring to fig. 8, the air permeable member 43 is chemically bonded to the end cap 42.

Chemical bond attachment includes, but is not limited to, one or more of polishing, friction hot melting, spray bonding, dry compounding, thermal compounding, and the like.

In some embodiments, reference is made to fig. 1 and 6. In the above technical solution, the ventilation member 43 and the end cover 42 are connected by chemical bonds, so that the structure stability is better than that of a simple interference fit; the chemical bond connection is used for replacing welding, so that welding slag such as metal scraps is avoided, the possibility of internal short of the battery cell 40 is reduced, and the safety performance of the battery cell 40 is improved.

The battery cell 40 may include a housing 41, an end cap 42, and a ventilation member 43. The housing 41 has an opening 411. The end cap 42 is used to cover the opening 411. The ventilation member 43 includes a first surrounding portion 431, and the first surrounding portion 431 surrounds a side of the housing 41 facing the end cover 42. The first surrounding portion 431 is provided with a first recess portion on a side facing the end cap 42, and the outer periphery of the end cap 42 is provided with a first protruding portion 421, and at least a portion of the first protruding portion 421 is accommodated in the first recess portion. The first surrounding portion 431 is chemically bonded to the end cap 42. The ventilation member 43 includes a second surrounding portion 432 and a first connecting portion 433, the second surrounding portion 432 surrounds a side of the housing 41 facing away from the end cap 42, the first connecting portion 433 is attached to an end surface of the housing 41 surrounding the opening 411, and serves 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 together define an accommodating space. The housing 41 includes an insertion portion 412, and the insertion portion 412 is accommodated in the accommodation space. The first surrounding portion 431 and the second surrounding portion 432 are used for clamping the insertion portion 412. The insertion portion 412 has a second boss 4121 protruding outward. The second surrounding portion 432 has a second concave portion disposed opposite to the second convex portion 4121. At least a portion of the second boss 4121 is received in the second recess. The air permeable member 43 includes at least one second connection portion 434 located within the receiving space. The insertion portion 412 has at least one through hole. The second connection part 434 is configured to pass through the through hole to connect the first surrounding part 431 and the second surrounding part 432. The through holes are distributed at intervals in a plurality of areas of the insertion portion 412 along the circumferential direction of the opening 411, and each through hole corresponds to one second connecting portion 434.

Referring to fig. 9 and 10, fig. 9 is a schematic view showing an exploded structure of a battery 20 according to an embodiment of the present application, and fig. 10 is a partially enlarged view of fig. 9. A battery 20 includes a case 21 and a battery cell 40 accommodated in the case 21.

The case 21 is used to provide the accommodating chamber 22 for the battery cell 40, and the case 21 may have various structures.

In some embodiments, the case 21 may include a first portion 211 and a second portion 212, the first portion 211 and the second portion 212 overlapping each other, the first portion 211 and the second portion 212 together defining 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, 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 together define the accommodating cavity 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 of the first portion 211 is closed to the opening 411 side of the second portion 212. Of course, the case 21 formed by the first portion 211 and the second portion 212 may be of various shapes, such as a cylinder, a rectangular parallelepiped, or the like.

In the battery 20, the plurality of battery cells 40 may be plural, and the plurality of battery cells 40 may be connected in series or parallel or in series-parallel, and the series-parallel refers to that the plurality of battery cells 40 are connected in series or parallel. The plurality of battery cells 40 can be directly connected in series or in parallel or in series-parallel, and then the whole formed by the plurality of battery cells 40 is accommodated in the box body 21; of course, a plurality of battery cells 40 may be connected in series or parallel or series-parallel to form a battery module, and then connected in series or parallel or series-parallel to form a whole and be accommodated in the case 21.

Referring to fig. 10, in some embodiments, the battery includes at least two battery cells 40, a heat insulator 31, and a support 32. The heat insulator 31 is disposed between adjacent two of the battery cells 40. The support 32 is supported between two adjacent battery cells 40 and abuts against the end of the heat insulating member 31 away from the end cover 42. The two second surrounding parts 432 of the adjacent two battery cells 40 abut against the heat insulating member 31 from both sides so that a gap 33 is formed between the heat insulating member 31 and the case 41.

The insulating member 31 may be an insulating material for insulating the battery cell 40 from other surrounding battery cells 40 when the battery cell 40 fails thermally.

The support 32 may be a high temperature resistant material. Abutment may be the existence of an interaction force between two objects such that the two are directly or indirectly connected. The support 32 and the heat insulator 31 are abutted against each other.

In the above technical solution, the heat insulation pad is matched with the second surrounding portion 432 and the frame to form the gap 33 between the heat insulation pad and the housing 41, so as to improve the heat insulation performance of the battery 20, prevent the single battery cell 40 from being affected by other surrounding battery cells 40 after thermal failure, and further improve the safety performance of the battery 20.

A third aspect of the present application provides a powered device.

The electric equipment can be vehicles, mobile phones, portable equipment, notebook computers, ships, spacecrafts, electric toys, electric tools and the like. The vehicle can be a fuel oil vehicle, a fuel gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle or a range-extended vehicle; spacecraft including airplanes, rockets, space planes, spacecraft, and the like; the electric toy includes fixed or mobile electric toys, such as a game machine, an electric car toy, an electric ship toy, and an electric airplane toy; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railroad power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete shakers, and electric planers, among others. The embodiment of the application does not limit the electric equipment in particular.

For convenience of explanation, the following embodiments take electric equipment as an example of a vehicle.

Referring to fig. 11, fig. 11 is a schematic structural diagram of a vehicle 10 according to some embodiments of the present application. The interior of the vehicle 10 is provided with a battery 20, and the battery 20 may be provided at the bottom or at the head or at the tail of the vehicle 10. The battery 20 may be used to power the vehicle 10, for example, the battery 20 may be used as an operating power source for the vehicle 10.

The vehicle 10 may also include a controller 11 and a motor 12, the controller 11 being configured to control the battery 20 to power the motor 12, for example, for operating power requirements during start-up, navigation, and travel of the vehicle 10.

In some embodiments of the present application, the battery 20 may not only serve as an operating power source for the vehicle 10, but may also serve as a driving power source for the vehicle 10, instead of or in addition to fuel oil or natural gas, to provide driving power for the vehicle 10.

Referring to fig. 12, fig. 12 is a flowchart of a method for manufacturing a battery cell 40 according to some embodiments of the present application, where the method includes:

s100: providing a housing 41, the housing 41 having an opening 411;

s200: providing an end cover 42, wherein the end cover 42 is made of metal;

s300: providing a ventilation member 43;

s400: fixing the ventilation member 43 to the outer periphery of the end cap 42;

s500: the end cap 43 is closed to the opening 411.

Wherein, at least part of the ventilation member 43 is located between the end cover 42 and the housing 41, and the ventilation member 43 is cooperatively connected with the end cover 42 and the housing 41, respectively, and the ventilation member 43 is configured such that when the air pressure inside the battery cell 40 is greater than the air pressure outside the battery cell 40, the inside air is released to the outside through the ventilation member 43.

In the above method, the sequence of step S100, step S200 and step S300 is not limited, for example, step S300 may be performed first, step S200 may be performed, and step S100 may be performed.

It should be noted that, the relevant structure of the battery cell 40 manufactured by the manufacturing method provided in the foregoing embodiments may be referred to the battery cell 40 provided in the foregoing embodiments, and will not be described herein again.

In addition, the embodiment of the present application further provides an apparatus 2000 for manufacturing a battery cell 40, referring to fig. 13, fig. 13 is a schematic block diagram of the apparatus 2000 for manufacturing a battery cell 40 provided in some embodiments of the present application, where the apparatus 2000 includes a first providing device 2100, a second providing device 2200, a third providing device 2300, and an assembling device 2400.

The first supply device 2100 is for supplying the housing 41, and the housing 41 has an opening 411. The second providing device 2200 is used for providing the end cover 42, and the end cover 42 is made of metal. The third providing means 2300 is for providing the air permeable member 43. The assembly device 2400 is used for fixing the ventilation member 43 to the outer periphery of the end cover 42, and for covering the end cover 42 to the opening 411.

Wherein, at least part of the ventilation member 43 is located between the end cover 42 and the housing 41, and the ventilation member 43 is cooperatively connected with the end cover 42 and the housing 41, respectively, and the ventilation member 43 is configured such that when the air pressure inside the battery cell 40 is greater than the air pressure outside the battery cell 40, the inside air is released to the outside through the ventilation member 43.

It should be noted that, regarding the structure of the battery cell 20 manufactured by the manufacturing apparatus 2000 provided in the above embodiment, the battery cell 20 provided in each of the above embodiments may be referred to, and will not be described herein again.

It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other.

The above embodiments are only for illustrating the technical solution of the present application, and are not intended to limit the present application, and various modifications and changes may be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims (13)

1. A battery cell, comprising:

a housing having an opening;

the end cover is used for covering the opening and is made of metal;

and the ventilation member is at least partially positioned between the end cover and the shell, is respectively connected with the end cover and the shell in a matching way, and is configured to release the internal gas to the outside through the ventilation member when the internal gas pressure of the battery cell is greater than the external gas pressure of the battery cell.

2. The battery cell according to claim 1, wherein the ventilation member is provided with a first recess portion on a side facing the end cap, and a first protruding portion is provided on an outer periphery of the end cap, and at least a portion of the first protruding portion is accommodated in the first recess portion.

3. The battery cell according to claim 1 or 2, wherein the ventilation member includes a first surrounding portion surrounding a side of the case facing the end cap, a first connecting portion attached to an end face of the case surrounding the opening, and a second surrounding portion for connecting the first surrounding portion and the second surrounding portion, the first surrounding portion, the second surrounding portion, and the first connecting portion together defining a receiving space; the housing includes an insertion portion that is accommodated in the accommodation space.

4. The battery cell of claim 3, wherein the first surrounding portion and the second surrounding portion are configured to retain the insert portion.

5. The battery cell as recited in claim 3, wherein the insert has a second protruding portion protruding outward, the second surrounding portion has a second recessed portion disposed opposite the second protruding portion, and at least a portion of the second protruding portion is received in the second recessed portion.

6. The battery cell according to claim 3 or 4, wherein the gas permeable member includes at least one second connection portion located within the receiving space, the insertion portion having at least one through hole, the second connection portion being configured to pass through the through hole to connect the first surrounding portion and the second surrounding portion.

7. The battery cell according to claim 6, wherein a plurality of the through holes are distributed at intervals in a plurality of regions of the insertion portion in a circumferential direction of the opening, each of the through holes corresponding to one of the second connection portions.

8. The battery cell of claim 1, wherein the gas permeable member is chemically bonded to the end cap.

9. A battery comprising a case and the battery cell of any one of claims 1-8 contained in the case.

10. The battery according to claim 9, characterized by comprising:

at least two of the battery cells of any one of claims 1-8;

the heat insulation piece is arranged between two adjacent battery monomers;

the support piece is supported between two adjacent battery cells and is abutted to the end part of the heat insulation piece, which is far away from the end cover, and the two second surrounding parts of the two adjacent battery cells are abutted to the heat insulation piece from two sides so as to form a gap between the heat insulation piece and the shell.

11. An electrical device comprising the battery of claim 9 or 10.

12. A method for manufacturing a battery cell, comprising:

providing a housing having an opening;

providing an end cover, wherein the end cover is made of metal;

providing a gas permeable member;

securing the gas permeable member to the outer periphery of the end cap;

covering the end cap on the opening;

wherein at least part of the ventilation member is located between the end cover and the housing, the ventilation member is respectively in fit connection with the end cover and the housing, and the ventilation member is 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.

13. A manufacturing apparatus of a battery cell, characterized by comprising:

first providing means for providing a housing, the housing having an opening;

the second providing device is used for providing an end cover, and the end cover is made of metal;

third providing means for providing a gas permeable member; and

an assembling means for fixing the ventilation member to the outer periphery of the end cap, the assembling means being for covering the end cap to the opening;

Wherein at least part of the ventilation member is located between the end cover and the housing, the ventilation member is respectively in fit connection with the end cover and the housing, and the ventilation member is 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.

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