CN116093533A - Battery cell, battery, electrical device, and battery cell manufacturing apparatus and method - 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, electrical device, and battery cell manufacturing apparatus and method

technical field

The present application relates to the field of battery technology, and in particular to a battery cell, a battery, an electrical device, and a battery cell manufacturing equipment and method.

Background technique

Due to the advantages of high energy density and environmental friendliness, power batteries are widely used in electronic devices such as mobile phones and notebook computers. In recent years, in response to environmental issues, gasoline price issues, and energy storage issues, the application of power batteries has rapidly expanded to gasoline-electric hybrid vehicles, ships, and energy storage systems.

In the development of power battery technology, in addition to improving the performance of battery cells, safety issues are 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.

Contents of the invention

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

A first aspect of the present application provides a battery cell, including: a casing, an end cover, and a ventilation member. The housing has an opening. End caps are used to close openings. The material of the end cap is metal. The breathable member is located at least partially between the end cap and the housing. The air-permeable component is matched and connected with the end cover and the shell respectively. 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 gas inside is released to the outside through the ventilation member.

In the above technical solution, the air-permeable member is arranged at least partially between the metal end cap and the housing, and is connected with the metal end cap and the housing respectively. When the air pressure inside the battery cell is greater than the air pressure outside the battery cell, the internal The gas is released to the outside through the breathable member. 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 breathable components are respectively connected with the metal end cover and the shell , Instead of welding the metal end cap and the shell, to a certain extent avoids the generation of burrs or metal shavings 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.

In some embodiments, the ventilation member is provided with a first recess on a side facing the end cap. The outer periphery of the end cap is provided with a first protrusion. At least part of the first protrusion is accommodated in the first recess.

In the above technical solution, the first concave part of the air-permeable member is mated with the first raised part of the end cap, which increases the mating area between the air-permeable member and the end cap; The relative movement of the cover improves the structural stability between the end cover and the breathable member; the welding is replaced by a mechanical structure fit connection or a chemical bond connection, which avoids the generation of welding slag such as metal shavings, and reduces the possibility of short circuits in the battery cell. 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 portion surrounds a side of the casing facing the end cover. The second surrounding portion surrounds a side of the housing away from the end cover. The first connecting part is attached to the end surface of the casing surrounding the opening and is used for connecting the first surrounding part and the second surrounding part. The first surrounding part, the second surrounding part and the first connecting part jointly define an accommodation space. The housing includes an insertion portion. The insertion part is accommodated in the accommodation space.

In the above technical solution, the first surrounding part surrounds the side of the housing facing the end cap, the second surrounding part surrounds the side of the housing away from the end cap, the first connecting part abuts against the end surface of the housing surrounding the opening, and uses For connecting the first surrounding part and the second surrounding part. The first surrounding part is used for 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 first surrounding part, reducing the expansion and deformation of the battery cell due to gas generation, and improving the battery life. The safety performance of the monomer; the area of the ventilating component and the shell is increased, and the structural stability between the venting component and the shell is improved; the welding is replaced by a mechanical structure matching connection or a chemical bond connection to avoid welding such as metal shavings. The slag reduces the possibility of short circuit inside the battery cell and improves the safety performance of the battery cell.

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

In the above technical solution, the first surrounding part and the second surrounding part are used to clamp the insertion part, thereby restricting the movement of the casing in a direction parallel to the end cover, and improving the structural stability.

In some embodiments, the insertion portion has a second protrusion protruding outward. The second surrounding portion has a second concave portion opposite to the second protruding portion. At least part of the second protrusion is accommodated in the second recess.

In the above technical solution, the second protrusion cooperates with the second recess to restrict the movement of the housing in the vertical direction of the end cap, and through the cooperation of the protrusion and the recess, the relative movement of the housing and the ventilation member is restricted, improving structural stability.

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

In the above technical solution, the second connection part is configured to pass through the through hole to connect the first surrounding part and the second surrounding part, and the ventilation member has at least one second connection part, and the insertion part has at least one through hole, which improves the air permeability Structural stability between members and shells.

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

In the above technical solution, a plurality of second connecting parts are arranged at intervals along the circumferential direction of the opening, which further improves the structural stability between the ventilation member and the casing.

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

In the above technical solution, the ventilation member and the end cap are connected by chemical bonds, which has better structural stability than simple interference fit; chemical bond connections are used instead of welding to avoid welding slag such as metal shavings and reduce the battery unit. The possibility of short-circuiting in the body improves the safety performance of the battery cell.

A second aspect of the present application provides a battery, including a case and battery cells accommodated in the case.

In some embodiments, a battery includes at least two battery cells, a thermal insulator, and a support. The heat insulating element is arranged between two adjacent battery cells. The supporting 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 two adjacent battery cells are against the heat insulating member from both sides, so that a gap is formed between the heat insulating member and the casing.

In the above technical solution, the heat insulator cooperates with the second surrounding part and the support to form a gap between the heat insulator and the casing, thereby improving the heat insulation performance of the battery and preventing the thermal failure of a single battery cell from spreading to the surroundings Other battery cells, thereby providing the safety performance of the battery.

A third aspect of the present application provides an electric device, including the battery 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 casing, the casing has an opening; providing an end cap, the material of which is metal; providing a ventilating member; fixing the venting member to the end cap Perimeter; the end cap is closed to the opening; wherein, at least part of the ventilating member is located between the end cap and the casing, the ventilating member is connected with the end cap and the casing respectively, and the ventilating member is configured so that when the air pressure inside the battery cell When the air pressure is greater than the air pressure outside the battery cell, the gas inside is released to the outside through the ventilation member.

A fifth aspect of the present application provides a battery cell manufacturing equipment, including: a first providing device for providing a casing, the casing has an opening; a second providing device for providing an end cover, the material of the end cover is metal; a third providing means for providing a ventilating member; and an assembly device for fixing the ventilating member to the outer periphery of the end cap and for covering the end cap to the opening; wherein at least part of the venting member is located between the end cap and the Between the shells, the breathable components are respectively mated with the end cap and the shell, and the breathable components are configured such that when the air pressure inside the battery cell is greater than the air pressure outside the battery cell, the gas inside is released to the outside through the breathable member.

The present application provides a battery cell, battery, electrical device and battery cell manufacturing equipment and method. In the battery cell, the ventilation member is configured to be at least partially located between the metal end cap and the The end cover and the housing are mated and connected, and when the air pressure inside the battery cell is greater than the air pressure outside the battery cell, the gas inside is released to the outside through the breathable member. 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 breathable components are respectively connected with the metal end cover and the shell , instead of welding the metal end cap and the shell, avoiding burrs or metal shavings during the welding process, thereby reducing the possibility of short circuits in the battery cell and improving the safety performance of the battery cell.

Description of drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the accompanying drawings that need to be used in the embodiments of the present application. Obviously, the accompanying drawings described below are only some embodiments of the present application. Those of ordinary skill in the art can also obtain other drawings based on the accompanying drawings on the premise of not paying creative efforts.

Fig. 1 is an exploded photo of a battery cell disclosed in an embodiment of the present application;

Fig. 2 is an axonometric 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 at C of Fig. 4 in an embodiment of the present application;

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

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

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

Fig. 9 is a schematic diagram of an exploded structure of a battery disclosed in an embodiment of the present application;

Figure 10 is a partially enlarged view of Figure 9;

Fig. 11 is a schematic structural view of a vehicle disclosed in an embodiment of the present application;

Fig. 12 is a flowchart of a battery cell manufacturing method disclosed in an embodiment of the present application;

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

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

Mark Description:

10-vehicle, 11-controller, 12 motor;

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

31-insulation, 32-support, 33-gap;

40-battery cell, 41-housing, 411-opening, 412-insertion part, 4121-second raised part, 42-end cover, 421-first raised part, 43-ventilating member, 431-first Surrounding portion, 432-the second surrounding portion, 433-the first connecting portion, 434-the second connecting portion;

2000-manufacturing equipment; 2100-first providing device; 2200-second providing device; 2300-third providing device; 2400-assembling device.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions 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 the Claim some of the examples, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of this application.

Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by those skilled in the technical field of this application; the terms used in this application in the description of the application are only to describe specific implementations The purpose of the example is not intended to limit the present application; the terms "comprising" and "having" and any variations thereof in the description and claims of the present application and the description of the above drawings are intended to cover non-exclusive inclusion. The terms "first", "second" and the like in the description and claims of the present application or the above drawings are used to distinguish different objects, rather than to describe a specific sequence or primary-subordinate relationship.

Reference in this application to an "embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The occurrences of this phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.

In the description of this application, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installation", "connection", "connection" and "attachment" should be understood in a broad sense, for example, it may be a fixed connection, It can also be detachably connected or integrally connected; it can be directly connected or indirectly connected through an intermediary, and it can be internal communication between two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in this application according to specific situations.

The term "and/or" in this application is only an association relationship describing associated objects, which means that there may be three relationships, for example, A and/or B, which can mean: A exists alone, A and B exist simultaneously, and A and B exist separately. There are three cases of B. In addition, the character "/" in this application generally indicates that the contextual objects are an "or" relationship.

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 the various components in the embodiments of the application shown in the drawings, as well as the overall thickness, length and width of the integrated device, are for illustrative purposes only, and should not constitute any limitation to the application .

"Plurality" in this application refers to two or more (including two).

In the present application, the 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, which are not limited in the embodiments of the present application. The battery cell can be in the form of a cylinder, a flat body, a cuboid or other shapes, which is not limited in this embodiment of the present application. Battery cells are generally divided into three types according to packaging methods: cylindrical battery cells, square battery cells and pouch battery cells, which are not limited in this embodiment of the present application.

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 this application may include a battery module or a battery pack, and the like. Batteries generally include a case for enclosing one or more battery cells. The box can prevent liquid or other foreign objects from affecting the charging or discharging of the battery cells.

The battery cell includes an electrode assembly and an electrolyte, and the electrode assembly is composed of a positive electrode sheet, a negative electrode sheet, and a separator. A battery cell works primarily by moving metal ions between the positive and negative plates. The positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer, the positive electrode active material layer is coated on the surface of the positive electrode current collector, and the positive electrode current collector that is not coated with the positive electrode active material layer protrudes from the positive electrode collector that has been coated with the positive electrode active material layer , the positive electrode current collector that is not coated with the positive electrode active material layer is used as the positive electrode tab. Taking a lithium-ion battery as an example, the material of the positive electrode current collector can be aluminum, and the positive electrode active material can be lithium cobaltate, lithium iron phosphate, ternary lithium or lithium manganate. The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer, the negative electrode active material layer is coated on the surface of the negative electrode current collector, and the negative electrode current collector that is not coated with the negative electrode active material layer protrudes from the negative electrode collector that has been coated with the negative electrode active material layer , the negative electrode current collector not coated with the negative electrode active material layer is used as the negative electrode tab. The material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon or silicon. In order to ensure that a large current is passed without fusing, the number of positive pole tabs is multiple and stacked together, and the number of negative pole tabs is multiple and stacked together. The material of the isolation film can be PP (polypropylene, polypropylene) or PE (polyethylene, polyethylene), etc. In addition, the electrode assembly may be a wound structure or a laminated structure, which is not limited in the embodiment of the present application.

The battery cell may also include a casing and an end cap assembly, the end cap assembly is covered by the casing 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.

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 casing are generally welded.

The inventors have found that a battery cell generally includes a casing, an electrode assembly contained in the casing, an electrolyte solution, an end cap connected to the casing, the electrode assembly includes a positive pole piece, a negative pole piece, and a separator between the positive pole piece and the negative pole piece. open diaphragm. To avoid leakage of the electrolyte solution, end caps usually seal the case. The battery cell will generate gas during the charging and discharging process, because the inside of the battery cell is a closed space, so as the battery cell usage time increases, the internal gas of the battery cell gradually increases, and the internal air pressure gradually increases, which is easy The risk of causing battery deformation and deterioration of the performance of the electrode assembly will affect the safety of the battery cell; during the welding process of the end cap and the shell of the battery cell, burrs or metal shavings will be generated, which may cause an internal short circuit of the battery cell. Thus affecting the safety of the battery cell.

In view of this, the embodiment of the present application proposes a technical solution. By disposing the ventilation member at least partly between the metal end cap and the housing, and fitting and connecting with the metal end cap and the housing respectively, when the air pressure inside the battery cell is greater than When the air pressure outside the battery cell is lowered, the gas inside is released to the outside through the ventilation member. 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 breathable components are respectively connected with the metal end cover and the shell , instead of welding the metal end cap and the shell, avoiding burrs or metal shavings 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.

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.

Referring to Figure 1, Figure 2, Figure 3, Figure 4 and Figure 5, Figure 1 is an exploded view of a battery cell 40 provided by an embodiment of the present application, and Figure 2 is a battery cell 40 provided by an embodiment of the present application An axonometric view of the body 40, Fig. 3 is a top view of a battery cell 40 provided by an embodiment of the present application, Fig. 4 is a cross-sectional view of Fig. 3 at A-A, Fig. 5 is a cross-sectional view of Fig. 4 at C in an embodiment of the present application Enlarged view of . The present application provides a battery cell 40, including: a housing 41, an end cover 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 material of the end cap 42 is metal. The ventilation member 43 is at least partially located between the end cap 42 and the housing 41 . The air-permeable member 43 is matched with the end cover 42 and the housing 41 respectively. 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 gas inside 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 casing 41 can be in various shapes, for example, a hollow three-dimensional structure such as a hollow cylinder, a hollow cuboid, etc., and the electrode assembly is accommodated in the cavity 22 of the hollow three-dimensional structure. The shape of the casing 41 can be determined according to the shape of the electrode assembly. For example, if the electrode assembly is a cylindrical structure, the casing 41 can be a hollow cylindrical structure; if the electrode assembly is a cuboid structure, the casing 41 can be a hollow cuboid. structure. The material of the shell 41 can be conductive materials such as copper, iron, aluminum, stainless steel, aluminum alloy, etc., or can be insulating materials such as plastics and rubber.

The opening 411 may be disposed on one or several surfaces of the casing 41 . The opening 411 may be in various shapes, such as rectangular, circular, and the like. After the shape of the housing 41 is determined, the shape of the opening 411 is also determined accordingly. Optionally, if the shell 41 is a hollow cylinder, the opening 411 is circular; if the shell 41 is a hollow cuboid, the opening 411 is rectangular. There can be one or two openings 411 . Optionally, when there is one opening 411, it can be arranged on any one surface of the hollow cuboid shell 41, or on the top or top surface of the hollow cylindrical shell 41; when there are two openings 411, it can be It is arranged on two opposite sides of the hollow cuboid shell 41 , or it can be set on the top surface and the bottom surface of the hollow cylindrical shell 41 ; when the number of openings 411 is more, it depends on the actual situation.

The end cap 42 is used to cover the opening 411 of the housing 41 . The end cap 42 can be in various shapes, such as circular, rectangular and so on. 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 can be selected; if the housing 41 is a cuboid structure, a rectangular end cap 42 can be selected. The end cap 42 is a carrier for other components such as electrode terminals. The end cap 42 can be used as an output pole of the battery cell 40, and the output pole is the part where the battery cell 40 is connected with other components and outputs the electric energy of the battery cell 40.

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

Referring to FIG. 5 , in some embodiments, the cross-section of the ventilation member 43 can be rectangular or quasi-rectangular, which means that the shape of a rectangle can be obtained through a certain deformation. to complete the fixation.

In some other embodiments, the air-permeable member 43 can be structurally deformed based on a rectangular or quasi-rectangular cross-section, so as to improve the strength of the air-permeable member 43 in cooperation with the end cap 42 and the housing 41 and improve structural stability.

The ventilation member 43 is at least partially located between the end cover 42 and the housing 41 to realize the function of connecting the end cover 42 and the housing 41. The air-permeable member 43 can also partially extend outwards to the outside of the housing 41 and cooperate with the housing 41; it can also partially extend to the top of the end cover 42; it can also partially extend to the bottom of the end cover 42.

The air-permeable member 43 is connected with the end cover 42 and the housing 41 respectively, and there are various ways of connection. In some embodiments, the air-permeable member 43 is connected to the end cover 42 and the housing 41 through chemical bonds; in some embodiments, the air-permeable frame is connected to the end cover 42 and the housing 41 through a mechanical structure; in some embodiments , the ventilation member 43 is connected to the end cover 42 through a chemical bond, and is connected to the housing 41 through a mechanical structure; in some embodiments, the ventilation member 43 is connected to the end cover 42 through a mechanical structure, and is connected to the housing 41 through a chemical bond. In some other embodiments, the connections between the air-permeable member 43 and the end cover 42 and the housing 41 are all through mechanical structural fit, and the chemical bonding strengthens the fit strength. Chemical bonding includes but is not limited to frictional hot melt, spray bonding, dry lamination process, thermal lamination process and other methods.

The air-permeable 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 internal gas is released to the outside through the air-permeable member 43; when the internal and external voltages of the battery cell 40 are similar, the air-permeable member 43 does not The air inside and outside the battery cell 40 is communicated with each other to pollute the inside of the battery cell 40 with air.

In the above technical solution, the ventilation member 43 is configured to be at least partially located between the metal end cap 42 and the housing 41, and is respectively connected with the metal end cap 42 and the housing 41. When the air pressure inside the battery cell 40 is greater than that of the battery cell When the air pressure of the outside is 40, the gas inside is released to the outside through the ventilation member 43. In this way, the gas generated during the use of the battery cell 40 can be discharged, reducing the expansion and deformation of the battery cell 40 due to gas production, and improving the safety performance of the battery cell 40; 1. The housing 41 is matched and connected to replace the metal end cap 42 and the housing 41 for welding, which avoids the generation of burrs or metal shavings during the welding process, thereby reducing the possibility of shorting the battery cell 40 and improving the battery cell. 40 safety features.

Please refer to Figure 6, Figure 7 and Figure 8, Figure 6 is an enlarged view of Figure 4 at C in another embodiment of the application, Figure 7 is a cross-sectional view of Figure 3 at B-B in an embodiment of the application, Figure 8 is An enlarged view at D of FIG. 7 in an embodiment of the present application. The surface of the air-permeable member 43 facing the end cap 42 is provided with a first concave portion. A first protruding portion 421 is formed on the outer periphery of the end cover 42 . At least part of the first protrusion 421 is accommodated in the first recess.

The outer perimeter may be the end surface surrounding the exterior of the end cap 42 .

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

In the above technical solution, the first concave part of the ventilation member 43 is mated with the first raised part 421 of the end cover 42, which increases the matching area between the ventilation member 43 and the end cover 42, and the convex part and the concave part are snapped together, Restricting the relative movement of the air-permeable member 43 and the end cover 42 improves the structural stability between the end cover 42 and the air-permeable member 43; the welding is replaced by a mechanical structure fit connection or a chemical bond connection, so as to avoid welding slag such as metal shavings and reduce The possibility of a short circuit in the battery cell 40 is eliminated, and the safety performance of the battery cell 40 is improved.

Continuing to refer to FIG. 6 and FIG. 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 casing 41 facing the end cover 42 . The second surrounding portion 432 surrounds a side of the casing 41 away from the end cover 42 . The first connecting portion 433 is attached to the end surface of the casing 41 surrounding the opening 411, and is used for connecting 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 housing 41 includes an insertion portion 412 . The insertion part 412 is accommodated in the accommodation space.

Surrounding can refer to a certain object as the center, and another object forms a ring or a ring-like structure around it. Facing can refer to facing or facing, and turning away can refer to facing away from. The first surrounding portion 431 and the second surrounding portion 432 respectively surround the inner and outer sides of the casing 41 . The cross sections of the first surrounding portion 431 and the second surrounding portion 432 can be in various shapes. The first surrounding portion 431 surrounds the side of the housing 41 facing the end cover 42, i.e. the inside of the housing 41;

The first connecting portion 433 can be in various shapes, used for connecting the first surrounding portion 431 and the second surrounding portion 432 , and is attached to the end surface of the casing 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 connecting portion 433 is attached to the end surface of the casing 41 surrounding the opening 411 .

The accommodation space may be an area that can accommodate objects. An accommodation space may be formed between the first surrounding part 431 , the second surrounding part 432 and the connecting part. The insertion part 412 may be a part of the housing 41 located in the accommodation space.

In the above technical solution, the first surrounding part 431 surrounds the side of the housing 41 facing the end cover 42, the second surrounding part 432 surrounds the side of the housing 41 facing away from the end cover 42, and the first connecting part 433 abuts against the shell The body 41 surrounds the end surface of the opening 411 and is used to connect the first surrounding portion 431 and the second surrounding portion 432 . The first surrounding part 431 is used for 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 first surrounding part 431, reducing the expansion of the battery cell 40 due to gas generation Deformation improves the safety performance of the battery cell 40; increases the matching area of the ventilating member 43 and the housing 41, improves the structural stability between the venting member 43 and the housing 41; connects with mechanical structure or chemical bond Instead of welding, welding slag such as metal shavings is avoided, the possibility of internal shorting of the battery cell 40 is reduced, and the safety performance of the battery cell 40 is improved.

Continuing to refer to FIG. 6 and FIG. 8 , the first surrounding portion 431 and the second surrounding portion 432 are used to clamp the insertion portion 412 .

Clamping can be that the first surrounding part 431 and the second surrounding part 432 apply force to the inserting part 412 from both sides respectively, so as to limit the movement of the inserting part 412 to both sides, so as to achieve the effect of fixing the inserting part 412.

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 restricting the movement of the housing 41 in a direction parallel to the end cover 42 and improving structural stability.

Continuing to refer to Fig. 6 and Fig. 8, the insertion portion 412 has a second protruding portion 4121 protruding outward. The second surrounding portion 432 has a second concave portion opposite to the second protruding portion 4121 . At least part of the second protrusion 4121 is accommodated in the second recess.

The second protruding portion 4121 may be an annular structure, that is, a protrusion located on the second surrounding portion 432 and extending toward the insertion portion 412 . The second recess is located at the insertion part 412 and cooperates with the second protrusion 4121. The shapes of the second protrusion 4121 and the second recess can be the same or different. The connection between the second protruding part 4121 and the second concave part may be mechanically structurally matched or chemically bonded. Interference fit and gap 33 fit can be used between the second protruding portion 4121 and the second recessed portion.

At least part of the second protrusion 4121 is accommodated in the second depression, that is, the second protrusion 4121 can be fully accommodated in the second depression, or partially accommodated in the second depression.

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

Referring to FIG. 6, the ventilation member 43 includes at least one second connecting portion 434 located in the accommodation space. The insertion part 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 .

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

The through hole is located in the insertion portion 412, so that the material of the air-permeable member 43 can enter the through hole from both sides of the through hole during heat fusion welding to realize heat fusion welding. There may be one or more through holes, and the number of through holes may be equal to that of the second connecting portion 434 or more than that of the second connecting portion 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 connecting part 431, and the insertion part 412 has at least one through hole, which improves the Structural stability between the ventilation member 43 and the housing 41 .

Referring to FIG. 6 , a plurality of through holes are distributed in multiple regions of the insertion portion at intervals along the circumferential direction of the opening, and each through hole corresponds to a second connecting portion.

In the above technical solution, a plurality of second connecting parts are arranged at intervals along the circumferential direction of the opening, which further improves the structural stability between the ventilation member and the casing.

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

The chemical bond connection includes, but is not limited to, one or more of polishing, frictional hot melting, spray bonding, dry lamination process, and thermal lamination process.

In some embodiments, refer to FIGS. 1 and 6 . In the above technical scheme, the ventilation member 43 and the end cover 42 are connected by chemical bonds, which has better structural stability than simple interference fit; chemical bond connections are used instead of welding to avoid welding slag such as metal shavings, reducing The possibility of an internal short in the battery cell 40 improves the safety performance of the battery cell 40.

The battery cell 40 may include a case 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 the side of the housing 41 facing the end cover 42. The first surrounding portion 431 is provided with a first recess on the side facing the end cover 42, and the outer periphery of the end cover 42 is provided with a first protrusion 421, at least part of the first protrusion 421 is accommodated in the first recess. 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 the side of the housing 41 facing away from the end cover 42, and the first connecting portion 433 is attached to the end surface of the housing 41 surrounding the opening 411 , and 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 housing 41 includes an insertion portion 412 accommodated in the accommodation space. The first surrounding portion 431 and the second surrounding portion 432 are used to clamp the insertion portion 412 . The insertion portion 412 has a second protruding portion 4121 protruding outward. The second surrounding portion 432 has a second concave portion opposite to the second protruding portion 4121 . At least part of the second protrusion 4121 is accommodated in the second recess. The ventilation member 43 includes at least one second connection part 434 located in the accommodation space. The insertion part 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 multiple regions of the insertion portion 412 at intervals along the circumferential direction of the opening 411 , and each through hole corresponds to a second connecting portion 434 .

Referring to FIG. 9 and FIG. 10 , FIG. 9 is a schematic diagram of an exploded structure of a battery 20 disclosed in an embodiment of the present application, and FIG. 10 is a partial enlarged view of FIG. 9 . A battery 20 includes a box body 21 and a battery cell 40 housed in the box body 21 .

Wherein, the box body 21 is used to provide the accommodating chamber 22 for the battery cell 40 , and the box body 21 may adopt various structures.

In some embodiments, the box body 21 may include a first part 211 and a second part 212, the first part 211 and the second part 212 cover each other, and the first part 211 and the second part 212 jointly define a The housing chamber 22. The second part 212 can be a hollow structure with an end opening 411, the first part 211 can be a plate-like structure, and the first part 211 covers the opening 411 side of the second part 212, so that the first part 211 and the second part 212 jointly define a The accommodating cavity 22; the first part 211 and the second part 212 can also be hollow structures with one side opening 411, and the opening 411 side of the first part 211 is covered on the opening 411 side of the second part 212. Certainly, the box body 21 formed by the first part 211 and the second part 212 may be in various shapes, such as a cylinder, a cuboid, and the like.

In the battery 20 , there may be multiple battery cells 40 , and the multiple battery cells 40 may be connected in series, parallel or mixed. The mixed connection means that the multiple battery cells 40 are both connected in series and in parallel. A plurality of battery cells 40 can be directly connected in series or in parallel or mixed together, and then the whole of the plurality of battery cells 40 is accommodated in the box body 21; of course, a plurality of battery cells 40 can also be connected in series first Or parallel or mixed connection to form a battery module, and multiple battery modules are connected in series, parallel or mixed to form a whole, and accommodated in the box 21 .

Referring to FIG. 10 , in some embodiments, a battery includes at least two battery cells 40 , a heat insulating member 31 and a support member 32 . The heat insulator 31 is disposed between two adjacent battery cells 40 . The supporting member 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 portions 432 of two adjacent battery cells 40 are against the heat insulator 31 from both sides, so that a gap 33 is formed between the heat insulator 31 and the casing 41 .

The heat insulating member 31 can be a heat insulating material, which is used to isolate the battery cell 40 when the battery cell 40 fails thermally, preventing it from spreading to other battery cells 40 around.

The support member 32 may be a high temperature resistant material. Butting can be the existence of an interaction force between two objects such that the two are connected directly or indirectly. The supporting member 32 and the insulating member 31 are in contact with each other.

In the above technical solution, the heat insulation pad cooperates with the second surrounding portion 432 and the frame to form a gap 33 between the heat insulation pad and the casing 41, thereby improving the heat insulation performance of the battery 20 and preventing the single battery cell 40 from overheating. After the failure, it affects other surrounding battery cells 40 , thereby improving the safety performance of the battery 20 .

The third aspect of the present application provides an electric device.

Electrical devices can be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys and power tools, etc. Vehicles can be fuel vehicles, gas vehicles or new energy vehicles, and new energy vehicles can be pure electric vehicles, hybrid vehicles or extended-range vehicles; spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.; electric toys include fixed Type or mobile electric toys, such as game consoles, electric car toys, electric boat toys and electric airplane toys, etc.; electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools and railway electric tools, for example, Electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, electric planers, and more. The embodiment of the present application does not impose special limitations on the above electric equipment.

For the convenience of description, the following embodiments will be described by taking the electric device as a vehicle as an example.

Please refer to FIG. 11 , which is a schematic structural diagram of a vehicle 10 provided by 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, head or tail of the vehicle 10 . The battery 20 can be used for power supply of the vehicle 10 , for example, the battery 20 can be used as an operating power source of the vehicle 10 .

The vehicle 10 may also 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, for starting, navigating and running the vehicle 10.

In some embodiments of the present application, the battery 20 can not only be used as an operating power source for the vehicle 10 , but can also be used 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 .

An embodiment of the present application 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 includes:

S100: Provide a casing 41, the casing 41 has an opening 411;

S200: Provide end cap 42, the material of end cap 42 is metal;

S300: providing a ventilation member 43;

S400: fixing the ventilation member 43 on the outer periphery of the end cover 42;

S500: Close the end cap 43 on the opening 411 .

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

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

It should be noted that, for the relevant structure of the battery cell 40 manufactured by the manufacturing methods provided in the above embodiments, reference may be made to the battery cell 40 provided in the above embodiments, which will not be repeated here.

In addition, the embodiment of the present application also provides a battery cell 40 manufacturing equipment 2000, please refer to Figure 13, Figure 13 is a schematic block diagram of the battery cell 40 manufacturing equipment 2000 provided by some embodiments of the present application, the manufacturing equipment 2000 It includes a first providing device 2100 , a second providing device 2200 , a third providing device 2300 and an assembling device 2400 .

The first providing device 2100 is used for providing the casing 41 , and the casing 41 has an opening 411 . The second providing device 2200 is used for providing the end cap 42, and the material of the end cap 42 is metal. The third providing device 2300 is used to provide the ventilation member 43. The assembly device 2400 is used to fix the ventilation member 43 on the outer periphery of the end cover 42, and is used to cover the end cover 42 on the opening 411.

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

It should be noted that, for the related structure of the battery cell 20 manufactured by the manufacturing equipment 2000 provided in the above embodiments, reference may be made to the battery cells 20 provided in the above embodiments, and details will not be repeated here.

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

The above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit the present application. For those skilled in the art, various modifications and changes may be made to the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of this application shall be included within the protection scope of this 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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