CN216872184U

CN216872184U - Exhaust device, battery cell, battery and power consumption device

Info

Publication number: CN216872184U
Application number: CN202123177235.2U
Authority: CN
Inventors: 蒙万秋; 刘倩; 叶永煌; 郑于炼; 薛龙飞; 张小细
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2021-12-16
Filing date: 2021-12-16
Publication date: 2022-07-01
Anticipated expiration: 2031-12-16

Abstract

The application provides an exhaust apparatus, battery monomer, battery and power consumption device, exhaust apparatus includes exhaust body and exhaust mechanism, exhaust mechanism is including setting up in coupling assembling and ventilative component, coupling assembling includes first connecting piece and second connecting piece, be provided with on the first connecting piece and be used for the first through-hole with the inside intercommunication of battery monomer, be provided with on the second connecting piece and be used for the second through-hole with the outside intercommunication of battery monomer, ventilative component is used for discharging gas to the free outside of battery through first through-hole and second through-hole, first connecting piece is used for attaching towards the inside surface of battery monomer with ventilative component, the second connecting piece is used for deviating from the surface of battery monomer inside with ventilative component and attaches, and the orthographic projection of first through-hole at ventilative component and the orthographic projection of second through-hole on ventilative component stagger the setting. The application can relieve the aging and damage of the ventilating component caused by the electrolyte attached to the ventilating component, and improves the overall reliability of the exhaust device.

Description

Exhaust device, battery cell, battery and power consumption device

Technical Field

The application relates to the technical field of batteries, in particular to an exhaust device, a battery cell, a battery, an electric device and a manufacturing method and manufacturing equipment of the exhaust device.

Background

Batteries are widely used in electronic devices such as mobile phones, notebook computers, battery cars, electric automobiles, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, electric tools, and the like.

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

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides an exhaust device, a single battery, a battery, an electricity utilization device, a method and equipment, wherein the exhaust device can meet the release requirement of internal gas of the single battery, and meanwhile, the safety performance of the single battery can be guaranteed.

In a first aspect, an embodiment of the present application provides an exhaust apparatus for a battery cell, including: an exhaust body; the exhaust mechanism comprises a connecting assembly and a breathable member, the connecting assembly is arranged on the exhaust body and used for connecting the exhaust body, the connecting assembly comprises a first connecting piece and a second connecting piece, a first through hole used for being communicated with the interior of the battery monomer is formed in the first connecting piece, a second through hole used for being communicated with the exterior of the battery monomer is formed in the second connecting piece, the breathable member is used for being communicated with the first through hole and the second through hole and exhausting gas to the exterior of the battery monomer through the first through hole and the second through hole when the gas pressure in the interior of the battery monomer reaches a threshold value, wherein the first connector is used for being attached with the surface of the air-permeable member facing the interior of the battery cell, the second connector is used for being attached with the surface of the air-permeable member facing away from the interior of the battery cell, and the orthographic projection of the first through hole on the air-permeable member and the orthographic projection of the second through hole on the air-permeable member are arranged in a staggered manner.

Among the above-mentioned technical scheme, exhaust apparatus includes exhaust body and exhaust mechanism, exhaust mechanism is including setting up in the coupling assembling and the ventilative component of exhaust body, coupling assembling includes first connecting piece and second connecting piece, both are used for with this body coupling of exhaust, first through-hole and the inside intercommunication of battery monomer on the first connecting piece, second through-hole and the outside intercommunication of battery monomer on the second connecting piece, when battery internal pressure reaches the threshold value, gaseous accessible first through-hole, ventilative component and second through-hole are with the inside gaseous outside the battery of discharging. Because the first through hole and the second through hole are arranged in a staggered mode, the area corresponding to the first through hole of the ventilating member can be attached to the second connecting piece, the area corresponding to the second through hole can be attached to the first connecting piece, when gas acts on the ventilating member in the exhaust process, acting force opposite to the internal gas pressure of the battery monomer can be provided for the ventilating member through the first connecting piece and the second connecting piece, the probability of deformation or creep of the ventilating member caused by the gas pressure in the exhaust process is reduced, the failure risk of the ventilating member caused by fatigue creep is reduced, and the safety performance and the reliability of the battery monomer applied to the exhaust device are improved.

Meanwhile, due to the arrangement, when the exhaust device works, even if the air permeable member is scratched by a foreign matter in the area corresponding to the first through hole or the area corresponding to the second through hole, the scratching position is not prone to creep damage, and the scratching position is attached to the first connecting piece or the second connecting piece, the risk of liquid leakage failure of electrolyte in the battery cell can be reduced or avoided.

In some embodiments, the number of the first through holes is multiple and the first through holes are distributed at intervals on the first connecting piece, and a first connecting part is formed between two adjacent first through holes and is used for being attached to one side surface of the breathable member facing the inside of the battery cell.

Among the above-mentioned technical scheme, set up a plurality of first through-holes at the interval on first connecting piece, do benefit to and satisfy the inside gas outgoing demand of battery monomer. Through making to form first connecting portion between the adjacent first through-hole to make first connecting portion and air permeable member towards the inside side surface of battery monomer attach, when the inside gas of battery monomer acts on air permeable member through air permeable member to the outside emission in-process of battery monomer, can provide the pulling force to air permeable member through first connecting portion, reduce air permeable member's deformation, improve the whole ability of nai internal pressure of exhaust apparatus, and then improve exhaust apparatus's security.

In some embodiments, the first connector includes a first body region for connecting the gas exhaust body, and a first gas exhaust region including a plurality of first through holes and a first connection portion, a portion of the gas permeable member facing the inner surface of the battery cell is attached to the first body region, another portion is attached to the first connection portion, and an orthographic projection of at least one of the first body region and the first connection portion on the gas permeable member covers an orthographic projection of the second through hole on the gas permeable member.

Among the above-mentioned technical scheme, first connecting piece includes first main part district and first exhaust region, can guarantee the joint strength between first connecting piece and the exhaust body through first main part district and exhaust body coupling. The gas in the single battery can be discharged through the first exhaust area, and the safety performance of the single battery is guaranteed. Since the air-permeable member is attached to the first body region in a part thereof and to the first exhaust region in another part thereof, that is, the air-permeable member is attached not only to the first connecting portion but also to the first body region, the strength of attachment between the air-permeable member and the first connector can be secured, reducing the risk of separation of the air-permeable member from the first connector. And the orthographic projection of at least one of the first main body area and the first connecting part on the breathable member covers the orthographic projection of the second through hole on the breathable member, so that the surface of the breathable member, which is away from the second connecting piece, and the area corresponding to the second through hole can be attached to the first main body area or the first connecting part, the deformation of the breathable member under the action of the air pressure in the battery cell is reduced, even if the area corresponding to the breathable member and the second through hole is scratched by a foreign matter, the scratching position is not easy to creep and damage, and the scratching position is attached to the first connecting piece, so that the risk of leakage and failure of electrolyte in the battery cell can be reduced or avoided.

In some embodiments, the number of the second through holes is multiple and the second through holes are distributed at intervals on the second connecting piece, and a second connecting portion is formed between two adjacent second through holes and is used for being attached to the surface of the breathable member, which faces away from the interior of the battery cell.

In the above scheme, a plurality of second through holes are arranged on the second connecting piece at intervals, so that the requirement for gas exhaust in the battery monomer is met. Through making form the second connecting portion between the adjacent second through-hole to make second connecting portion and air permeable member deviate from the inside side surface of battery monomer and attach, when the inside gas of battery monomer acts on air permeable member through air permeable member to the outside emission in-process of battery monomer, can provide the holding power to air permeable member through the second connecting portion, reduce air permeable member's deformation, improve the whole ability of nai interior pressure of exhaust apparatus, and then improve exhaust apparatus's security.

In some embodiments, the second connector includes a second body region for connecting the vent body, and a second vent region including a plurality of second through holes and a second connection portion, a portion of the vent member facing away from the inner surface of the battery cell is attached to the second body region, another portion is attached to the second connection portion, and an orthographic projection of at least one of the second body region and the second connection portion on the vent member covers an orthographic projection of the first through hole on the vent member.

In the technical scheme, the second connecting piece comprises the second main body area and the second exhaust area, and can be connected with the exhaust body through the second main body area, so that the connecting strength between the second connecting piece and the exhaust body is ensured. The gas in the single battery can be discharged through the second exhaust area, and the safety performance of the single battery is guaranteed. Since the air-permeable member is attached to the second main body region in a portion thereof and to the second exhaust region in another portion thereof, that is, the air-permeable member is attached not only to the second connecting portion but also to the second main body region, the attachment strength between the air-permeable member and the second connecting member can be secured, reducing the risk of separation of the air-permeable member from the second connecting member. And the orthographic projection of at least one of the second main body area and the second connecting part on the ventilating member covers the orthographic projection of the first through hole on the ventilating member, so that the area, corresponding to the first through hole, of the surface, away from the first connecting part, of the ventilating member can be attached to the second main body area or the second connecting part, the deformation of the ventilating member under the action of the air pressure in the battery cell is reduced, even if the area, corresponding to the first through hole, of the ventilating member is scratched by a foreign matter, the scratching position is not prone to creep damage, the scratching position is attached to the second connecting part, and the risk of leakage and failure of electrolyte in the battery cell can be reduced or avoided.

In some embodiments, the exhaust body is provided separately from the exhaust mechanism, the exhaust mechanism being connected to the exhaust body by at least one of the first connector and the second connector.

Among the above-mentioned technical scheme, exhaust body and exhaust mechanism can be independent two parts, and exhaust mechanism can be connected with exhaust body through one in first connecting piece and the second connecting piece, also can connect simultaneously, realizes the sealed effect of different degrees, independently separately provides can be to the independent nimble processing and the setting of exhaust body and exhaust mechanism. In addition, the exhaust body and the exhaust mechanism can be manufactured by adopting different materials through separate molding, so that the whole exhaust device can select proper materials and processing technology according to the structural characteristics and the use requirements of the exhaust mechanism.

In some embodiments, the vent body has a third through hole extending in an axial direction of the first through hole, the third through hole for receiving at least a portion of the vent mechanism.

Among the above-mentioned technical scheme, the exhaust body has the third through-hole along the axial extension of first through-hole, and the third through-hole is the at least part that is used for holding exhaust mechanism, can reduce the holistic occupation space of exhaust apparatus on satisfying the basis of exhaust demand, realizes the nimble assembly of two independent devices of exhaust body and exhaust mechanism through the third through-hole, can fix a position exhaust mechanism's installation, reduces the assembly degree of difficulty between exhaust mechanism and the exhaust body.

In some embodiments, the third through hole is a stepped hole, the third through hole includes a first hole section, a second hole section, and a first step surface, the first step surface connects the hole wall of the first hole section and the hole wall of the second hole section, and the first step surface is used for supporting one of the first connecting piece and the second connecting piece.

Among the above-mentioned technical scheme, the third through hole is the shoulder hole, the third through hole includes first hole section, second hole section and first step face, first hole section can hold one among first connecting piece and the second connecting piece, the second hole section can hold the other among first connecting piece and the second connecting piece, ventilative component can be located first hole section or second hole section, can support one among first connecting piece and the second connecting piece through first step face, do benefit to the installation to first connecting piece, ventilative component and second connecting piece, the location and with exhaust the screens between the body and be connected.

In some embodiments, the third bore further comprises a third bore section and a second step face connecting the bore wall of the second bore section and the bore wall of the third bore section, the second step face for supporting the other of the first and second connectors.

Among the above-mentioned technical scheme, the third through hole still includes third hole section and second step face, can make whole exhaust mechanism joint on the third hole section, supports another in first connecting piece and the second connecting piece with the second step face, does benefit to the location to first connecting piece and second connecting piece and with the exhaust body between be connected.

In some embodiments, the exhaust body has a first recess recessed in an axial direction of the first through hole, one of the first connecting piece and the second connecting piece is formed in a bottom wall of the first recess, the air-permeable member is located in the first recess, and the other of the first connecting piece and the second connecting piece is located at least partially in the first recess and is provided separately from the exhaust body.

Among the above-mentioned technical scheme, can be with first connecting piece or second connecting piece and exhaust body integrated into one piece, as the diapire of the first concave part of exhaust body, integrated into one piece can simplify production technology, saves the cost of manufacture material, is convenient for assemble with ventilative component, also can strengthen the joint strength with between the exhaust body. The ventilating member is arranged in the first concave part, the other one of the first connecting piece and the second connecting piece is at least partially positioned in the concave part and is provided separately from the exhaust body, and the other one of the first connecting piece and the second connecting piece is formed in a split mode and is processed and assembled separately, so that the requirements for installation of the ventilating member and attachment between the ventilating member and the first connecting piece and between the ventilating member and the second connecting piece are met.

In some embodiments, at least one of the first connecting piece and the second connecting piece is welded with the exhaust body, and a gap is formed between the ventilation component and the exhaust body in the radial direction of the first through hole.

In the above technical scheme, at least one of the first connecting piece and the second connecting piece is welded with the exhaust body, so that the connection strength and the sealing property between the exhaust body and the first connecting piece and/or the second connecting piece are ensured, a gap is formed between the ventilation member and the exhaust body, a heat conduction path is prevented from being formed between the ventilation member and the exhaust body, and further, the ventilation member is prevented from being damaged due to the fact that heat generated by the first connecting piece and/or the second connecting piece in the process of welding with the exhaust body is transferred to the ventilation member.

In some embodiments, the vent member comprises a layer of vent membrane, a surface of the vent membrane facing the interior of the battery cell is attached to the first connector, and a surface of the vent membrane facing away from the interior of the battery cell is attached to the second connector.

Among the above-mentioned technical scheme, ventilative component can adopt the air current exchange of one deck ventilated membrane realization battery inside and outside, and the production of being convenient for is makeed ventilative effectual.

In some embodiments, the ventilation member comprises a first ventilation film, a second ventilation film and a third ventilation film which are stacked in the axial direction of the first through hole, the surface of the first ventilation film facing the interior of the battery cell is attached to the first connecting piece, the surface of the third ventilation film facing away from the interior of the battery cell is attached to the second connecting piece, and the ventilation amount of the second ventilation film is greater than that of the first ventilation film and that of the third ventilation film.

In the technical scheme, the surface of the first breathable film facing the interior of the battery cell is attached to the first connecting piece, the surface of the third breathable film departing from the interior of the battery cell is attached to the second connecting piece, and the attachment of the breathable films with more than two layers increases the air tightness of the exhaust mechanism, so that the breathable films are more firmly contacted, liquid leakage is prevented, and the reliability of the exhaust mechanism is improved. The ventilative volume of second ventilated membrane is greater than the ventilative volume of first ventilated membrane and the ventilative volume of third ventilated membrane, has compensatied because the ventilative hindrance that first through-hole and second through-hole dislocation set lead to, has improved the flexibility of ventilative design, ensures that the inside gas of electric core is effectively discharged the outside fast.

In some embodiments, the second breathable film has a melting point that is higher than the melting point of the first breathable film and the melting point of the third breathable film.

Among the above-mentioned technical scheme, the melting point that sets up the second ventilated membrane is higher than the melting point of other two-layer ventilated membranes, can make the second ventilated membrane have better thermosetting like this, prevents that the situation of collapsing from appearing in its aperture edge when ventilated membrane and first connecting piece and second connecting piece heat complex attach, plays the fixed effect of intermediate strut that can be fine.

In some embodiments, the number of the second breathable films is two or more, the two or more second breathable films are both located between the first breathable film and the third breathable film, and the two or more second breathable films are stacked in the axial direction.

Among the above-mentioned technical scheme, the axial is range upon range of between first ventilated membrane and third ventilated membrane and is set up the second ventilated membrane more than two-layer, can satisfy the demand to the different ventilative volume of ventilative mechanism, thermosetting and thickness, has effectively improved the flexibility of ventilative design.

In some embodiments, the gas permeable member is chemically bonded to at least one of the first connector and the second connector.

In the technical scheme, the ventilation component is connected with at least one of the first connecting piece and the second connecting piece into a whole through chemical bonds, so that the bonding strength between the ventilation component and the first connecting piece and/or the second connecting piece is improved, and the ventilation component and the first connecting piece and/or the second connecting piece are more firmly and stably attached to each other. And, adopt the mode of chemical bond connection, can prevent that electrolyte from passing through to produce between ventilative component and the first connecting piece or the second connecting piece and attach the gap, and then can avoid electrolyte and ventilative component's port contact or soak, avoid ventilative component to take place the swelling.

In some embodiments, a second concave portion is disposed on one of the first connecting member and the second connecting member, the second concave portion is formed by a surface of one of the first connecting member and the second connecting member being recessed in a direction away from the other one of the first connecting member and the second connecting member, the air-permeable member is at least partially accommodated in the second concave portion, and a bottom wall and a side wall of the second concave portion are abutted against the air-permeable member.

Among the above-mentioned technical scheme, set up the second concave part on one of first connecting piece and second connecting piece, arrange ventilative component in the second concave part, the diapire and the lateral wall of second concave part all butt in ventilative component, the ventilative component is partly surrounded to the second concave part, do benefit to and fix a position ventilative component, avoid ventilative component to take place the drunkenness in the footpath of first through-hole, make ventilative component need not with exhaust body lug connection, only need with at least one of first connecting piece and second connecting piece with exhaust body welding can, the assembly connection flow is simplified, can fix ventilative component in the second concave part better, make it more stable, also provide an assembly structure for whole exhaust mechanism, the flexible design equipment of being convenient for.

In some embodiments, a containment chamber is formed within the exhaust body, the exhaust body having a plurality of walls defining the containment chamber, at least one of the walls being provided with the exhaust mechanism.

Among the above-mentioned technical scheme, the inside chamber that holds that is formed with of exhaust body, exhaust body have and define out a plurality of walls that hold the chamber, and at least one wall is provided with exhaust mechanism, that is to say, exhaust apparatus can be for holding the shell structure of electrode subassembly, and exhaust apparatus collection holds function and exhaust function as an organic whole.

In some embodiments, the vent body is an end cap of the cell.

In the above technical solution, the exhaust body is an end cap of the battery cell, that is, the exhaust mechanism may be an end cap disposed on the battery cell.

In a second aspect, the present application provides a battery cell, including the exhaust device provided in any one of the embodiments of the first aspect.

In a third aspect, an embodiment of the present application provides a battery, including the battery cell provided in any one of embodiments of the second aspect; and a case for accommodating the battery cell.

In a fourth aspect, an embodiment of the present application provides an electric device, including the battery provided in any one of the embodiments of the third aspect, for providing electric energy.

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

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used 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 it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

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

fig. 2 is a schematic structural diagram of a battery provided in some embodiments of the present application;

fig. 3 is an exploded view of a battery cell provided in some embodiments of the present application;

FIG. 4 is a top view of an exhaust apparatus provided in accordance with certain embodiments of the present application;

FIG. 5 is a cross-sectional view taken along A-A of FIG. 4;

FIG. 6 is a schematic view of the mating of the vent member and the connection assembly according to some embodiments of the present disclosure;

FIG. 7 is a partial structural schematic view of a vent body according to some embodiments of the present application;

FIG. 8 is an exploded view of an exhaust device according to further embodiments of the present application;

FIG. 9 is a cross-sectional view of an exhaust apparatus provided in accordance with still other embodiments of the present application;

FIG. 10 is a cross-sectional view of an exhaust apparatus provided in accordance with still other embodiments of the present application;

FIG. 11 is a cross-sectional view of an exhaust apparatus provided in accordance with still other embodiments of the present application;

FIG. 12 is a block diagram of a breathable member provided in accordance with certain embodiments of the present application;

FIG. 13 is a schematic view of a breathable member according to still further embodiments of the present disclosure;

FIG. 14 is a schematic view of a breathable member according to further embodiments of the present disclosure;

FIG. 15 is a cross-sectional view of an exhaust apparatus according to still other embodiments of the present application;

FIG. 16 is a cross-sectional view of an exhaust apparatus provided in accordance with still other embodiments of the present application;

FIG. 17 is a top view of an exhaust device according to still other embodiments of the present application;

FIG. 18 is a cross-sectional view taken along line B-B of FIG. 17;

FIG. 19 is an enlarged view at C of FIG. 18;

FIG. 20 is a cross-sectional view of an exhaust device according to further embodiments of the present application.

The reference numbers in the detailed description are as follows:

1000-a vehicle;

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

10-a box body; 11-a first part; 12-a second part;

20-a battery cell;

21-a housing;

22-an electrode assembly; 221-positive pole tab; 222-a negative electrode tab;

23-end caps; 231 — positive electrode terminal; 232-negative electrode terminal;

24-an exhaust;

241-an exhaust body;

2411-a first recess;

2412-a third through hole; 2412 a-a first bore section; 2412 b-a second bore section; 2412 c-a third pore section; 2412 d-a first step surface; 2412 e-a second step surface;

2413-a second recess; 2414-a holding cavity; 2415 a-bottom wall; 2415 b-side wall;

242-an exhaust mechanism; 2421-a linkage assembly; 2421 a-a first connector; 2421 b-a second linkage; 24211-a first body region; 24212 — a first exhaust zone; 24213-a second body region; 24214 — a second exhaust area;

2422-a venting member; 2422 a-a first vented membrane; 2422 b-a second vented membrane; 2422c — a third vented membrane;

2423-a first via; 2424-a second via; 2425-a first connection; 2426-a second connecting part; x-axial direction.

Detailed Description

In order to make the objects, 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 with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection 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 in the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "including" and "having," and any variations thereof in the description and claims of this application and the description of the figures above, are intended to cover non-exclusive inclusions. The terms "first," "second," and the like in the description and claims of this application or in the foregoing drawings are used for distinguishing between different elements and not 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 can be included in at least one embodiment of the specification. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "attached" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as the case may be.

The term "and/or" in this application is only one kind of association relationship describing the association object, and means that there may be three kinds of relationships, for example, a and/or B, and may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" in this application generally indicates that the former and latter related objects are in an "or" relationship.

In the embodiments of the present application, like reference numerals denote like parts, and a detailed description of the same parts is omitted in different embodiments for the sake of brevity. It should be understood that the thickness, length, width and other dimensions of the various components in the embodiments of the present application and the overall thickness, length, width and other dimensions of the integrated device shown in the drawings are only exemplary and should not constitute any limitation to the present application.

The appearances of "a plurality" in this application are intended to mean 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 in the embodiments of the present application. The battery cell may be a cylinder, a flat body, a rectangular parallelepiped, or other shapes, which is not limited in the embodiments of the present application. The battery cells are generally divided into three types in an encapsulation manner: the cylindrical battery monomer, the square battery monomer and the soft package battery monomer are also not limited in the embodiment of the application.

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, etc. Batteries generally include a case for enclosing one or more battery cells. The box can avoid liquid or other foreign matters to influence the charging or discharging of battery monomer.

The battery monomer comprises an electrode assembly and electrolyte, wherein the electrode assembly comprises a positive pole piece, a negative pole piece and an isolating membrane. The battery cell mainly depends on metal ions to move between the positive pole piece and the negative pole piece to work. The positive pole piece includes anodal mass flow body and anodal active substance layer, and anodal active substance layer coats in anodal mass flow body's surface, and the anodal mass flow body protrusion in the anodal mass flow body that has coated anodal active substance layer of uncoated anodal active substance layer, and the anodal mass flow body that does not coat anodal active substance layer is as anodal utmost point ear. 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 pole piece includes negative pole mass flow body and negative pole active substance layer, and the negative pole active substance layer coats in the surface of negative pole mass flow body, and the negative pole mass flow body protrusion in the negative pole mass flow body of coating the negative pole active substance layer not coating the negative pole active substance layer, and the negative pole mass flow body of not coating the negative pole active substance layer is as negative pole utmost point ear. 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 can be passed through without fusing, a plurality of positive electrode tabs are stacked together, and a plurality of negative electrode tabs are stacked together. The material of the isolation film may be PP (polypropylene) or PE (polyethylene). In addition, the electrode assembly may have a winding structure or a lamination structure, and the embodiment of the present application is not limited thereto.

The development of battery technology needs to consider various design factors, such as energy density, cycle life, discharge capacity, charge and discharge rate, and other performance parameters, and also needs to consider the safety of the battery.

In the single battery, the single battery undergoes charge-discharge cycles for many times, side reactions exist, gas is continuously generated, certain air pressure exists in the single battery, and the gas between the pole pieces cannot be timely removed along with the rise of the air pressure, so that the insertion and the removal of lithium ions are influenced, and further the risk of lithium precipitation is caused. In order to ensure the safety of the battery cell, an exhaust device is generally disposed in the battery cell, and the exhaust device exhausts the gas generated inside the battery cell to ensure the safety of the battery cell.

The inventors found that even if the battery cell is provided with the exhaust device, the battery cell still has a risk of ignition and explosion. The inventor further researches and discovers that in the process that the battery cell discharges the gas generated in the battery cell through the exhaust device, the gas permeable member in the exhaust device has no support structure or only the support structure is arranged on one side in the gas discharge direction, when the gas pressure in the battery cell reaches a preset threshold value, the gas can be discharged out of the battery cell through the gas permeable member, and the gas can act on the gas permeable member in the discharge process, so that the gas permeable member is easy to deform, the creep failure risk exists in long-term use, the aging of the gas permeable member is accelerated, and finally the reliability of a product is reduced.

In view of this, the embodiment of the present application provides an exhaust apparatus, in which a connection assembly and a ventilation member are disposed on an exhaust body, the connection assembly includes a first connection piece and a second connection piece, the first connection piece is provided with a first through hole for communicating with the inside of a battery cell, the second connection piece is provided with a second through hole for communicating with the outside of the battery cell, and the ventilation member is configured to communicate the first through hole and the second through hole and discharge gas to the outside of the battery cell through the first through hole and the second through hole when the gas pressure inside the battery cell reaches a threshold value; the first connecting piece is used for being attached to the surface, facing the interior of the battery cell, of the ventilating member, the second connecting piece is used for being attached to the surface, facing away from the interior of the battery cell, of the ventilating member, and the orthographic projection of the first through hole on the ventilating member and the orthographic projection of the second through hole on the ventilating member are arranged in a staggered mode.

When such a vent device is used for a battery cell, when the internal pressure of the battery reaches a threshold value, gas can vent the internal gas of the battery to the outside of the battery through the first through hole, the gas permeable member, and the second through hole. Because the first through hole and the second through hole are arranged in a staggered mode, the area corresponding to the first through hole of the ventilating member can be attached to the second connecting piece, the area corresponding to the second through hole can be attached to the first connecting piece, when gas acts on the ventilating member in the exhaust process, acting force opposite to the internal gas pressure of the battery monomer can be provided for the ventilating member through the first connecting piece and the second connecting piece, the probability of deformation or creep of the ventilating member caused by the gas pressure in the exhaust process is reduced, the failure risk of the ventilating member caused by fatigue creep is reduced, and the safety performance and the reliability of the battery monomer applied to the exhaust device are improved.

The exhaust device described in the embodiment of the application is suitable for the battery cell, the battery and the electric device and equipment using the battery.

The electric devices and 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 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 extending vehicle and the like; spacecraft include aircraft, rockets, space shuttles, and spacecraft, among others; electric toys include stationary or mobile electric toys, such as game machines, electric car toys, electric ship toys, electric airplane toys, and the like; the electric power tools include metal cutting electric power tools, grinding electric power tools, assembly electric power tools, and electric power tools for railways, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, electric impact drills, concrete vibrators, and electric planers. The embodiment of the present application does not specifically limit the above-mentioned electric devices.

For convenience of explanation, the following embodiments will be described with an electric device as an example of a vehicle.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a vehicle 1000 according to some embodiments of the present disclosure, a battery 100 is disposed inside the vehicle 1000, and the battery 100 may be disposed at a bottom portion, a head portion, or a tail portion of the vehicle 1000. The battery 100 may be used for power supply of the vehicle 1000, for example, the battery 100 may serve as an operation power source of the vehicle 1000.

The vehicle 1000 may further include a controller 200 and a motor 300, the controller 200 being configured to control the battery 100 to supply power to the motor 300, for example, for starting, navigation, and operational power requirements while the vehicle 1000 is traveling.

In some embodiments of the present application, the battery 100 may be used not only as an operating power source of the vehicle 1000, but also as a driving power source of the vehicle 1000, instead of or in part of fuel or natural gas, to provide driving power for the vehicle 1000.

Referring to fig. 2, fig. 2 is a schematic structural diagram of a battery 100 according to some embodiments of the present disclosure, where the battery 100 includes a case 10 and a battery cell 20, and the case 10 is used for accommodating the battery cell 20.

The case 10 is a component for accommodating the battery cell 20, the case 10 provides an accommodating space for the battery cell 20, and the case 10 may have various structures. In some embodiments, the case 10 may include a first portion 11 and a second portion 12, and the first portion 11 and the second portion 12 cover each other to define a receiving space for receiving the battery cell 20. The first and second portions 11 and 12 may be in various shapes, such as rectangular parallelepiped, cylindrical, etc. The first portion 11 may be a hollow structure with one side open, the second portion 12 may also be a hollow structure with one side open, and the open side of the second portion 12 is covered on the open side of the first portion 11, thereby forming the box body 10 with a receiving space. The first portion 11 may have a hollow structure with one side opened, the second portion 12 may have a plate-like structure, and the second portion 12 may cover the opened side of the first portion 11 to form the case 10 having an accommodating space. The first part 11 and the second part 12 may be sealed by a sealing element, which may be a sealing ring, a sealant or the like.

In the battery 100, one or more battery cells 20 may be provided. If there are a plurality of battery cells 20, the plurality of battery cells 20 may be connected in series, in parallel, or in series-parallel, where in series-parallel refers to that the plurality of battery cells 20 are connected in series or in parallel. A plurality of battery cells 20 may be connected in series, in parallel, or in series-parallel to form a battery module, and a plurality of battery modules may be connected in series, in parallel, or in series-parallel to form a whole, and may be accommodated in the case 10. Or all the battery cells 20 may be directly connected in series or in parallel or in series-parallel, and the whole of all the battery cells 20 is accommodated in the case 10.

Referring to fig. 3, fig. 3 is an exploded view of a battery cell 20 according to some embodiments of the present disclosure, in which the battery cell 20 includes an end cap 23, an electrode assembly 22, a case 21, and a vent 24.

The case 21 is a member for accommodating the electrode assembly 22, and the case 21 may be a hollow structure having one end formed with an opening. The housing 21 may be in various shapes, such as a cylinder, a rectangular parallelepiped, or the like. The material of the housing 21 may be various, such as copper, iron, aluminum, steel, aluminum alloy, etc.

One or more electrode assemblies 22 may be provided in the case 21. For example, as shown in fig. 3, the electrode assembly 22 is plural, and the plural electrode assemblies 22 are arranged in a stack.

The electrode assembly 22 is a component of the battery cell 20 in which electrochemical reactions occur. The electrode assembly 22 may include a positive electrode tab, a negative electrode tab, and a separator. The electrode assembly 22 may have a winding type structure formed by winding a positive electrode tab, a separator, and a negative electrode tab, or a lamination type structure formed by laminating a positive electrode tab, a separator, and a negative electrode tab.

The positive electrode sheet may include a positive electrode current collector and positive electrode active material layers coated on opposite sides of the positive electrode current collector. The negative electrode tab may include a negative electrode current collector and a negative electrode active material layer coated on opposite sides of the negative electrode current collector. The electrode assembly 22 has a positive electrode tab 221 and a negative electrode tab 222, and the positive electrode tab 221 may be a portion of the positive electrode sheet not coated with the positive electrode active material layer, and the negative electrode tab 222 may be a portion of the negative electrode sheet not coated with the negative electrode active material layer.

The end cap 23 is a member that covers an opening of the case 21 to isolate the internal environment of the battery cell 20 from the external environment. The end cap 23 covers an opening of the case 21, and the end cap 23 and the case 21 together define a sealed space for accommodating the electrode assembly 22, the electrolyte, and other components. The shape of the end cap 23 can be adapted to the shape of the housing 21, for example, the housing 21 has a rectangular parallelepiped structure, the end cap 23 has a rectangular plate structure adapted to the housing 21, and for example, the housing 21 has a cylindrical structure, and the end cap 23 has a circular plate structure adapted to the housing 21. The end cap 23 may be made of various materials, such as copper, iron, aluminum, steel, aluminum alloy, etc., and the material of the end cap 23 may be the same as or different from that of the housing 21.

The end cap 23 may be provided thereon with electrode terminals for electrical connection with the electrode assembly 22 to output electric power of the battery cell 20. The electrode terminals may include a positive electrode terminal 231 for electrical connection with the positive tab 221 and a negative electrode terminal 232 for electrical connection with the negative tab 222. The positive electrode terminal 231 and the positive electrode tab 221 may be directly connected or indirectly connected, and the negative electrode terminal 232 and the negative electrode tab 222 may be directly connected or indirectly connected.

The exhaust device 24 is a member that exhausts the gas inside the battery cell 20, and when the gas pressure inside the battery cell 20 reaches the first threshold value, the gas inside the battery cell 20 is exhausted through the exhaust device 24. The specific structure of the exhaust device 24 will be described in detail below with reference to the accompanying drawings.

Referring to fig. 4 and 5, fig. 4 is a top view of an exhaust device 24 according to some embodiments of the present disclosure, and fig. 5 is a cross-sectional view taken along a direction a-a in fig. 4. The vent device 24 provided by the embodiment of the application is used for the battery cell 20, and the vent device 24 comprises a vent body 241 and a vent mechanism 242. The exhaust mechanism 242 includes a connection assembly 2421 and a vent member 2422, the connection assembly 2421 is disposed on the exhaust body 241, the connection assembly 2421 is configured to connect the exhaust body 241, the connection assembly 2421 includes a first connection part 2421a and a second connection part 2421b, the first connection part 2421a is provided with a first through hole 2423 for communicating with the inside of the battery cell, the second connection part 2421b is provided with a second through hole 2424 for communicating with the outside of the battery cell, and the vent member 2422 is configured to communicate the first through hole 2423 and the second through hole 2424 and exhaust gas to the outside of the battery cell through the first through hole 2423 and the second through hole 2424 when the gas pressure inside the battery cell reaches a threshold value. Wherein the first connector 2421a is used for being attached to a surface of the vent member 2422 facing the inside of the battery cell, the second connector 2421b is used for being attached to a surface of the vent member 2422 facing away from the inside of the battery cell, and the orthographic projection of the first through hole 2423 on the vent member 2422 is staggered from the orthographic projection of the second through hole 2424 on the vent member 2422.

The exhaust body 241 may be a component mounted on the end cap 23, for example, the exhaust device 24 may be a plate-like structure mounted on the end cap 23. The entirety of the exhaust body 241 may also be the end cap 23 for covering the electrode assembly 22. Illustratively, the end cap 23 is the exhaust body 241. The exhaust body 241 may also be a case 21 for accommodating the electrode assembly 22, the exemplary case 21 is the exhaust body 241, and the connection assembly 2421 of the exhaust mechanism 242 may be connected to the case 21.

The connecting component 2421 and the exhaust body 241 may be at least partially of an integral structure, or of course, may be of a split structure, and when the split structure is adopted, the two may be fixedly connected by welding or the like.

The first linkage 2421a may include two, three or more first through holes 2423, and the second linkage 2421b may include two, three or more second through holes 2424, and the number of the first through holes 2423 is not particularly limited.

The shape of the first through-hole 2423 may be a regular geometric shape, for example, a circle, an ellipse, a regular polygon. Of course, irregular geometric shapes are also possible, and the application is not limited to a specific shape. The shape of the second through-hole 2424 may be a regular geometric shape, such as a circle, an ellipse, a regular polygon. Of course, irregular geometric shapes are also possible, and the application is not limited to a specific shape.

The shape of each of the first through holes 2423 of the plurality of first through holes 2423 may be the same, for example, each of the plurality of first through holes 2423 may be circular, oval, or oval, etc. Of course, the shapes of the first through holes 2423 in the plurality of first through holes 2423 may be different or at least some of the first through holes 2423 may be different, for example, some of the first through holes 2423 in the plurality of first through holes 2423 may be circular, some of the first through holes 2423 may be oval, polygonal, or the like, and likewise, the shapes of the second through holes 2424 in the plurality of second through holes 2424 may be the same, and of course, the shapes of the first through holes 2424 may be different or at least some of the first through holes 2424 may be different, which is not described herein again.

The number of the first through holes 2423 and the number of the second through holes 2424 may be the same, but may be different. The shape and size of the first through hole 2423 may be the same as or different from those of the second through hole 2424.

The first through hole 2423 and the second through hole 2424 can be formed by various methods, such as punch forming, milling, etc., and the embodiment of the present application is not limited in this respect.

The distribution pattern of the plurality of first through holes 2423 on the first connection part 2421a is not particularly limited, for example, the plurality of first through holes 2423 may be distributed in rows and columns or in arrays, or may be distributed sequentially along a circular track, or may be distributed sequentially along a linear track or a curved track, the plurality of second through holes 2424 are respectively arranged in a staggered manner from top to bottom, and an orthographic projection of each second through hole 2424 on the air permeable member 2422 is arranged in a staggered manner from an orthographic projection of each first through hole 2423 on the air permeable member 2422.

The ventilation member 2422 has a ventilation function, and may be made of PP (polypropylene), PE (polyethylene), PU (polyurethane), etc., and when the gas inside the battery cell 20 is exhausted, the gas needs to pass through the ventilation member 2422. The vent member 2422 can allow gas inside the battery cell 20 to flow to the outside, and can block moisture and the like outside the battery cell 20 from entering the inside of the battery cell 20.

The attachment may mean that the component a and the component b abut against each other, but may mean that the component a and the component b are in contact with and connected to each other with a connecting force therebetween. Specifically, in the vent device 24 provided in the embodiments of the present application, for example, the component a is the first connector 2421a, and the component b is the vent member 2422, the first connector 2421a and the surface of the vent member 2422 facing the inside of the battery cell 20 are attached, which may be understood as that the first connector 2421a may press against the surface of the vent member 2422 facing the inside of the battery cell 20 and contact each other, the first connector 2421a and the vent member 2422 may not be connected to only abut against each other, and of course, there may be a connecting force between each other, and when there is a connecting force between each other, for example, a chemical bond connection, an adhesive connection, or the like may be used for connecting. The second connector 2421b is attached to the surface of the vent member 2422 facing away from the inside of the battery cell, and is not described herein.

The orthographic projections of the first through holes 2423 on the ventilation member 2422 and the orthographic projections of the second through holes 2424 on the ventilation member 2422 are staggered, so that the orthographic projection of any one first through hole 2423 on the ventilation member 2422 and the orthographic projection of each second through hole 2424 on the ventilation member 2422 do not overlap.

In the above technical solution, the exhaust mechanism 242 includes a connection assembly 2421 and a ventilation member 2422 disposed on the exhaust body 241, and the connection assembly 2421 includes a first connection element 2421a and a second connection element 2421b for connecting the exhaust body 241, so that the connection between the connection assembly 2421 and the exhaust body 241 is more stable, and stability and sealing performance are ensured. The first connecting part 2421a is provided with a first through hole 2423 for communicating with the inside of the battery cell, the second connecting part 2421b is provided with a second through hole 2424 for communicating with the outside of the battery cell, and the ventilation member 2422 is used for communicating the first through hole 2423 and the second through hole 2424 and exhausting gas to the outside of the battery cell through the first through hole 2423 and the second through hole 2424 when the gas pressure inside the battery cell reaches a threshold value, so as to achieve the purpose of exhausting the gas inside the battery cell 20.

Due to the staggered arrangement of the first through holes 2423 and the second through holes 2424, the areas of the air permeable member 2422 corresponding to the first through holes 2423 can be attached to the second connecting pieces 2421b, and the areas corresponding to the second through holes 2424 can be attached to the first connecting pieces 2421a, so that when gas acts on the air permeable member 2422 during the venting process, acting force opposite to the gas pressure inside the battery cell can be respectively provided for the air permeable member 2422 through the first connecting pieces 2421a and the second connecting pieces 2421b, the probability of deformation or creep of the air permeable member 2422 caused by the gas pressure during the venting process is reduced, the failure risk of the air permeable member 2422 due to fatigue creep is reduced, and the safety performance and the reliability of the battery cell applied to the venting device are improved.

Meanwhile, the above arrangement makes it possible to reduce or avoid the risk of leakage failure of the electrolyte inside the battery cell, since the area of the vent member 2422 corresponding to the first through-hole 2423 can be attached to the second connector 2421b and the area corresponding to the second through-hole 2424 can be attached to the first connector 2421a, the scratched position is less prone to creep damage, and the scratched position is connected to the first connector 2421a or the second connector 2421b, even when the area of the vent member 2422 corresponding to the first through-hole 2423 or the area corresponding to the second through-hole 2424 is scratched by foreign substances while the vent device 24 is operating.

Referring to fig. 6, in some embodiments, the number of the first through holes 2423 is multiple and the first through holes 2421a are spaced apart, a first connection part 2425 is formed between two adjacent first through holes 2423, and the first connection part 2425 is used for being attached to a side surface of the vent member 2422 facing the inside of the battery cell.

The hole walls of two adjacent first through holes 2423 are at least partially spaced, and the first connection part 2425 is an area where the first connection part 2421a is located between two adjacent first through holes 2423. In any direction perpendicular to the axial direction X of the first through holes 2423, a first connection part 2425 may be formed between every adjacent two of the first through holes 2423.

The first connection part 2425 is attached to the ventilating member 2422, and the ventilating member 2422 may contact and abut the connection part of the 2425. The vent member 2422 and the first connection part 2425 can be connected with each other by means of adhesion or chemical bond connection.

The plurality of first through holes 2423 are formed in the first connecting part 2421a at intervals, so that the requirement for exhausting gas inside the battery cell can be met. By forming the first connection part 2425 between the adjacent first through holes 2423 and attaching the first connection part 2425 to a surface of the gas permeable member 2422 facing the inside of the battery cell 20, when gas inside the battery cell acts on the gas permeable member 2422 during the discharge of gas to the outside of the battery cell 20 through the gas permeable member 2422, a tensile force may be provided to the gas permeable member 2422 through the first connection part 2425, the deformation of the gas permeable member 2422 is reduced, the internal pressure resistance of the entire vent device 24 is improved, and the safety of the vent device 24 is improved.

In some embodiments, the first connection part 2421a includes a first body region 24211 and a first vent region 24212, the first body region 24211 is used for connecting the vent body 241, the first vent region 24212 includes a plurality of first through holes 2423 and a first connection part 2425, a portion of the vent member 2422 facing the inner surface of the battery cell is attached to the first body region 24211, another portion of the vent member is attached to the first connection part 2425, and an orthographic projection of at least one of the first body region 24211 and the first connection part 2425 on the vent member 2422 covers an orthographic projection of the second through hole 2424 on the vent member 2422.

The first body area 24211 and the first exhaust area 24212 of the first connection element 2421a may be an integral structure, a split structure, or an integral structure, which can ensure the connection strength therebetween and facilitate the formation of the first connection element 2421 a.

The first body region 24211 may be disposed around the first exhaust region 24212, the outer periphery of the first body region 24211 may be connected to the exhaust body 241, alternatively, the first body region 24211 may be fixedly connected to the exhaust body 241 by welding, or may be flexibly connected to the exhaust body 241 by adopting other various forms, and the connection manner of the two is not particularly limited in this application on the premise of ensuring the internal airtightness of the battery.

Since the airing member 2422 is attached to the first body region 24211 at a portion thereof and the first exhaust region 24212 at another portion thereof, that is, the airing member 2422 is attached not only to the first connecting part 2425 but also to the first body region 24211, it is possible to secure the attachment strength between the airing member 2422 and the first connector 2421a, reducing the risk of the airing member 2422 being separated from the first connector 2421 a.

The plurality of first through holes 2423 and the first connection parts 2421a are disposed in the first venting area 24212, and the vent member 2422 is attached to both the first connection part 2421a of the venting area 24212 and the first body area 24211, so as to ensure the attachment strength between the vent member 2422 and the first connection part 2421a and reduce the risk of the vent member 2422 being separated from the first connection part 2421a

The orthographic projection of at least one of the first main body area 24211 and the first connection part 2425 on the vent member 2422 covers the orthographic projection of the second through hole 2424 on the vent member 2422, which means that the first main body area 24211 or the first connection part 2425 corresponds to the second through hole 2424 in the axial direction X, so that the area, corresponding to the second through hole 2424, of the surface of the vent member 2422 facing away from the second connection part 2421b can be attached to the first main body area 24211 or the first connection part 2425, the deformation of the vent member 2422 under the internal air pressure of the battery cell 20 is reduced, even if the area, corresponding to the vent member 2422 and the second through hole 2424, is scratched by a foreign substance, the scratched position is not easily damaged by creep, the scratched position is attached to the first connection part, and the risk of electrolyte leakage failure in the battery cell can be reduced or avoided

With continued reference to fig. 6, in some embodiments, the number of the second through holes 2424 is multiple and the second through holes 2421b are distributed at intervals, a second connection part 2426 is formed between two adjacent second through holes 2424, and the second connection part 2426 is used for being attached to a surface of the vent member 2422 facing away from the interior of the battery cell.

In the above scheme, the second connecting parts 2421b are provided with the plurality of second through holes 2424 at intervals, so that the requirement for exhausting the gas inside the battery cell 20 can be met. By forming the second connection parts 2426 between the adjacent second through holes 2424 and attaching the second connection parts 2426 to the surface of the gas permeable member 2422 facing away from the inside of the battery cell 20, when gas inside the battery cell 20 acts on the gas permeable member 2422 during the discharge of the gas to the outside of the battery cell through the gas permeable member 2422, a supporting force can be provided to the gas permeable member 2422 through the second connection parts 2426, the deformation of the gas permeable member 2422 is reduced, the internal pressure resistance of the whole vent device 24 is improved, and the safety of the vent device is improved.

The first connection part 2425 and the second connection part 2426 are matched with each other to jointly fix the middle ventilating member 2422, so that the deformation or creep of the ventilating member 2422 caused by the internal air pressure of the battery cell is relieved.

In some embodiments, the second connector 2421b includes a second body region 24213 and a second vent region 24214, the second body region 24213 is used for connecting the vent body 241, the second vent region 24214 includes a plurality of second through holes 2424 and a second connection part 2426, a portion of the vent member 2422 facing away from the inner surface of the cell is attached to the second body region 24213, another portion of the vent member is attached to the second connection part 2426, and an orthographic projection of at least one of the second body region 24213 and the second connection part 2426 on the vent member 2422 covers an orthographic projection of the first through hole 2423 on the vent member 2422.

The connection between the second body section 24213 and the exhaust body 241 can refer to the connection between the first body section 24211.

In the above technical solution, the second connector 2421b comprises the second body area 24213 and the second vent area 24214, and the second body area 24213 can be connected with the vent body 241, so as to ensure the connection strength between the second connector 2421b and the vent body 241.

The gas in the battery cell 20 may be discharged through the second vent region 24214, ensuring the safety performance of the battery cell 20. Since the vent member 2422 is partially attached to the second body section 24213 and partially attached to the second exhaust section 24214, that is, the vent member 2422 is attached not only to the second connecting section 2426 but also to the second body section 24213, it is possible to secure the attachment strength between the vent member 2422 and the second connecting section 2421b, reducing the risk of the vent member 2422 being separated from the second connecting section 2421 b.

In addition, the orthographic projection of at least one of the second main body area 24213 and the second connecting part 2426 on the ventilation member 2422 covers the orthographic projection of the first through hole 2423 on the ventilation member 2422, so that the area, corresponding to the first through hole 2423, of the surface of the ventilation member 2422 facing away from the first connecting part 2421a can be attached to the second main body area 24213 or the second connecting part 2426, the deformation of the ventilation member 2422 under the action of the air pressure inside the battery cell 20 is reduced, even if the area, corresponding to the first through hole 2423, of the ventilation member 2422 is scratched by a foreign substance, the scratched position is not prone to creep damage, and the scratched position is attached to the second connecting part 2421b, and the risk of leakage failure of the electrolyte inside the battery cell can be reduced or avoided.

In some embodiments, the exhaust body 241 is provided separately from the exhaust mechanism 242, and the exhaust mechanism 242 is connected to the exhaust body 241 by at least one of the first connection part 2421a and the second connection part 2421 b.

The provision of the vent body 241 separate from the vent mechanism 242 may allow the vent body 241 and the vent mechanism 242 to be two separate components, separately manufactured and manufactured prior to being assembled, and when assembled together, the vent mechanism 242 to be connected to the vent body 241 by the first connector 2421a or the second connector 2421 b.

Through the arrangement, the exhaust body 241 and the exhaust mechanism 242 are independent components, and processing and assembling are facilitated. The exhaust body 241 and the exhaust mechanism 242 may be manufactured separately from different materials by separate molding. So that the whole exhaust device can select proper materials and processing technique according to the structural characteristics and the use requirements of the exhaust mechanism 242.

Referring to fig. 7, in some embodiments, the exhaust body 241 has a third through hole 2412 extending along the axial direction X of the first through hole 2423, and the third through hole 2412 is used for accommodating at least a portion of the exhaust mechanism 242.

The venting mechanism 242 may be partially located within the third passage 2412 or may be entirely located within the third passage 2421.

The third through hole 2412 may have a uniform cross section in the axial direction X, or may have a variable cross section, and in some alternative embodiments, when the variable cross section is provided, it may also have a stepped hole form.

The shape and configuration of the third through hole 2412 can be adapted to the outer contour of the air exhausting mechanism 242, so as to facilitate the installation of the air exhausting mechanism 242 and the sealing connection with the third through hole 2412.

According to the exhaust device 24 provided by the embodiment of the application, the exhaust body 241 is provided with the third through hole 2412 extending along the axial direction X of the first through hole 2423, and the third through hole 2412 accommodates at least one part of the exhaust mechanism 242, so that the overall occupied space of the exhaust device 24 can be reduced on the basis of meeting the exhaust requirement, flexible assembly of two independent devices of the exhaust body 241 and the exhaust mechanism 242 is realized through the third through hole 2421, the exhaust mechanism 242 can be positioned in installation, and the assembly difficulty between the exhaust mechanism 242 and the exhaust body 241 is reduced.

In some embodiments, the third through bore 2412 may be a stepped bore, the third through bore 2412 comprising a first bore section 2412a, a second bore section 2412b, and a first stepped surface 2412d, the first stepped surface 2412d connecting a bore wall of the first bore section 2412a and a bore wall of the second bore section 2412b, the first stepped surface 2412d for supporting one of the first connector 2421a and the second connector 2421 b.

The radial dimension of the first bore section 2412a may be greater than the radial dimension of the second bore section 2412b, but may also be less than the radial dimension of the second bore section 2412 b. The first stepped surface 2412d may be used to support the first link 2421a, but may be used to support the second link 2421 b.

The exhaust device 24 provided by the embodiment of the present application, through the above arrangement, facilitates the installation, positioning and locking connection of the first connector 2421a, the vent member 2422 and the second connector 2421b to the exhaust body 241.

The third through hole 2412 may be formed by various manners, such as punch forming, milling forming, and the like, which are not limited in this application.

Alternatively, as shown with reference to fig. 5 to 7, the radial dimension of the first hole section 2412a may be made smaller than the radial dimension of the second hole section 2412b, the second hole section 2412b is disposed near the inside of the battery cell 20, and the first hole section 2412a is located at a side of the second hole section 2412b facing away from the inside of the battery cell 20. First step surface 2412d may be used to support first link 2421 a.

It is understood that the above arrangement provides a possibility of stacking the third through holes 2412, and there may be various combinations.

Referring to fig. 8, in some other alternative embodiments, the radial dimension of the first hole section 2412a may be larger than that of the second hole section 2412b, and the second hole section 2412b may also be disposed near the inside of the battery cell, and the first hole section 2412a is located at the side of the second hole section 2412b facing away from the inside of the battery cell 20. First step surface 2412d may be used to support second connector 2421 b.

Referring to fig. 9, in some embodiments, the third through hole 2412 further includes a third hole section 2412c and a second step surface 2412e, the second step surface 2412e connects the hole wall of the second hole section 2412b and the hole wall of the third hole section 2412c, and the second step surface 2412e is used for supporting the other of the first connector 2421a and the second connector 2421 b.

In some alternative embodiments, the third hole section 2412c may be disposed on a side of the second hole section 2412b facing the inside of the battery cell 20, the radial dimension of the third hole section 2412c may be smaller than the area where the air discharge mechanism 242 has the smallest radial dimension, and the second step surface 2412e supports a portion of the air discharge mechanism 242 and is disposed in an overlapping manner with each other.

In the exhaust device 24 provided by the embodiment of the application, by making the third through hole 2412 further include the third hole section 2412c and the second step surface 2412e, the whole exhaust mechanism 242 can be clamped on the third hole section 2412, and the second step surface 2412e is used to support the other of the first connecting element 2421a and the second connecting element 2421b, so as to facilitate the positioning of the first connecting element 2421a and the second connecting element 2421b and the connection with the exhaust body 241.

Referring to fig. 10 and 11, in some embodiments, the exhaust body 241 has a first recess 2411 recessed along the axial direction X of the first through hole 2423, one of the first connection part 2421a and the second connection part 2421b is formed on the bottom wall of the first recess 2411, the air permeable member 2422 is located in the first recess 2411, and the other of the first connection part 2421a and the second connection part 2421b is at least partially located in the first recess 2411 and is provided separately from the exhaust body 241.

The first recess 2411 is formed by removing a portion of the material on the exhaust body 241. When the vent is used with the battery cell 20, the first recess 2411 may be disposed facing the electrode assembly 22, but may also be disposed away from the electrode assembly 22.

The orthographic projection shape of the first concave portion 2411 may be circular, elliptical, polygonal, etc., and the present application is not particularly limited.

The air discharge mechanism 242 may be partially located in the first recess 2411, but the air discharge mechanism 242 may be entirely located in the first recess 2411.

As shown in fig. 10, the first connection part 2421a may be formed at the bottom wall of the first recess 2411, and the second connection part 2421b is partially located in the first recess 2411 and provided separately from the gas discharge body 241, and the first recess 2411 may be formed by recessing the surface of the gas discharge body 241 facing away from the interior of the battery cell 20 in the axial direction X of the first through hole 2423. Of course, this is an alternative embodiment, as shown in fig. 11, it is also possible to form the second connection part 2421b on the bottom wall of the first recess 2411, and the first connection part 2421a is partially located in the first recess 2411 and is provided separately from the gas exhaust body 241, and the first recess 2411 may be formed by the surface of the gas exhaust body 241 facing and close to the inside of the battery cell and recessed along the axial direction X of the first through hole 2423.

The provision of the vent body 241 separately from the first connector 2421a or the second connector 2421b allows the vent body 241 and the first connector 2421a or the second connector 2421b to be manufactured separately as two separate components prior to being assembled, and when assembled together, the vent mechanism 242 is connected to the vent body 241 by the connector assembly 2421. Alternatively, the first recess 2411 may be formed in a multistage step shape to facilitate positioning of the first connection member 2421a or the second connection member 2421b in the axial direction X of the first through-hole 2423.

Through the arrangement, the exhaust body 241 and the first connecting part 2421a or the second connecting part 2421b are integrally formed, so that the processing process flow and the material cost are saved, a certain assembling space is also saved, and the formed first concave part 2411 also provides a containing space for the ventilating member 2422. The other of the first connector 2421a or the second connector 2421b is provided separately from the exhaust body 241 so that the exhaust body 241 and the other of the first connector 2421a or the second connector 2421b are each separate components to facilitate assembly. The exhaust body 241 and the exhaust mechanism 242 may be manufactured separately from different materials by separate molding. So that the whole exhaust device can select proper materials and processing technique according to the structural characteristics and the use requirements of the exhaust mechanism 242.

With continued reference to fig. 10 and 11, in some embodiments, at least one of the first connector 2421a and the second connector 2421b is welded to the exhaust body 241, and a gap is formed between the vent member 2422 and the exhaust body 241 in a radial direction of the first through hole 2423.

Alternatively, the first connector 2421a or the second connector 2421b may be welded with the exhaust body 241, or both of them may be welded with the exhaust body 241, and the exhaust mechanism 242 and the exhaust body 241 are hermetically connected together to seal the inside of the battery, optionally, the welding connection is laser welding.

For example, when one of the first and

second connectors

2421a and 2421b is formed at the bottom wall of the first recess 2411, the other of the first and

second connectors

2421a and 2421b may be welded to the exhaust body 241. When the first connector 2421a and the second connector 2421b are provided separately from the exhaust body 241, the first connector 2421a and the second connector 2421b can be welded to the exhaust body 241, respectively.

When the first connecting element 2421a and the second connecting element 2421b are both connected with the exhaust body 241 in a welding manner, the connection strength and the sealing property between the exhaust body 241 and the first connecting element 2421a and/or the second connecting element 2421b are ensured, the probability of product leakage failure can be reduced, and the dual guarantee of preventing leakage is formed. And a gap is formed between the vent member 2422 and the exhaust body 241, so that a heat conduction path is prevented from being formed between the vent member 2422 and the exhaust body 241, and further, heat generated by the first connector 2421a and/or the second connector 2421b during welding with the exhaust body 241 is prevented from being transferred to the vent member 2422, so that the vent member 2422 is prevented from being damaged.

With continued reference to fig. 10 and 11, in some embodiments, the vent member 2422 comprises a vented membrane, a surface of the vented membrane facing the interior of the cell is attached to the first connector 2421a, and a surface of the vented membrane facing away from the interior of the cell is attached to the second connector 2421 b.

Alternatively, the vent member 2422 is a vent film attached to the first connecting part 2421a at the upper and lower surfaces in the axial direction X of the first through hole 2423, and attached to the second connecting part 2421b at the upper surface in the axial direction X.

Optionally, the upper and lower surfaces of the vented membrane may contain polar functional groups, which are bonded to the first and

second connectors

2421a and 2421b by chemical bonding, van der waals force, etc., to ensure the bonding strength between the vented membrane and the first and

second connectors

2421a and 2421 b.

Referring to fig. 12 and 13, in some embodiments, the vent member 2422 includes a first vent membrane 2422a, a second vent membrane 2422b and a third vent membrane 2422c stacked in the axial direction X of the first through hole 2423, a surface of the first vent membrane 2422a facing the interior of the battery cell is attached to the first connecting member 2421a, a surface of the third vent membrane 2422c facing away from the interior of the battery cell is attached to the second connecting member 2421b, and a vent amount of the second vent membrane 2422b is greater than that of the first vent membrane 2422a and that of the third vent membrane 2422 c.

Alternatively, three of the first, second, and third

breathable membranes

2422a, 2422b, and 2422c may be provided in a stacked arrangement in the axial direction X of the first through hole 2423, and the first, second, and third

breathable membranes

2422a, 2422b, and 2422c may be connected to each other, but may be unconnected to each other only in the stacked arrangement.

Alternatively, the surface of the first vent membrane 2422a facing the first connecting member 2421a and the surface of the third vent membrane 2422c facing the second connecting member 2421b may comprise polar functional groups to bond with the corresponding first and second connecting

members

2421a and 2421b by chemical bonding, van der waals force, or the like, wherein the air permeability of the second vent membrane 2422b is greater than that of the first vent membrane 2422a and that of the third vent membrane 2422 c.

Through the arrangement, the first breathable film 2422a is tightly connected with the first connecting piece 2421a, and the third breathable film 2422c is tightly connected with the second connecting piece 2421b, so that better double sealing is realized, the air tightness inside the battery is improved, the risk of internal leakage is reduced, and the reliability of the whole structure is improved to a great extent. The ventilation volume of the second breathable film 2422b is larger than that of the first breathable film 2422a and that of the third breathable film 2422c, so that the overall ventilation volume of the ventilation member 2422 is increased, the condition that the ventilation volume is attenuated due to the fact that the path is lengthened because gas diffusion is blocked by a staggered through hole during air exhaust is made up, the original ventilation volume is maintained or increased, and the safety inside the battery is ensured.

In some embodiments, the melting point of the second vent membrane 2422b is higher than the melting point of the first vent membrane 2422a and the melting point of the third vent membrane 2422 c.

The melting point of the selected second breathable membrane 2422b is higher than the melting points of the first and third

breathable membranes

2422a, 2422c, and the present embodiment does not limit the constituent materials of the first and second

breathable membranes

2422a, 2422b, and 2422c, as long as it is ensured that the thermosetting property of the second breathable membrane 2422b is higher than that of the first and third

breathable membranes

2422a, 2422c under the same environment.

Setting the second vent membrane 2422b to a higher melting point can prevent the second vent membrane 2422b from easily generating plastic deformation, and can serve as a support for the whole vent member 2422, prevent the occurrence of collapse at the aperture edge when the vent member 2422 is thermally compositely attached to the connecting member 2421, and improve the overall stability of the vent member 2422.

Referring to fig. 14, in some embodiments, the number of the second vent films 2422b is two or more, the two or more second vent films 2422b are both located between the first vent film 2422a and the third vent film 2422c, and the two or more second vent films 2422b are stacked in the axial direction X.

The number of the second breathable films 2422b can be set to more than two layers according to needs, the specific number of the layers is not limited in the embodiment of the present application, and the materials of each layer of the second breathable films 2422b can be the same or different, but all the requirements of the breathable amount and the melting point need to be satisfied.

Through the multilayer arrangement to second ventilated membrane 2422b, can make the life of whole ventilative component 2422 improve, add interchangeable ventilative rete, prevent the risk that the individual layer ventilated membrane became invalid, provide the safety guarantee for whole ventilative component 2422 to can arrange the range upon range of in a flexible way with the multilayer ventilated membrane, with the demand that satisfies different ventilative volume and melting point, promote the flexibility of ventilative design.

In some embodiments, the vent member 2422 is integrally chemically bonded to at least one of the first connector 2421a and the second connector 2421 b.

Chemical bonds are a general term for strong interaction forces between two or more adjacent atoms (or ions) within a pure molecule or within a crystal. The force that binds ions or atoms is commonly referred to as a chemical bond.

The ventilation member 2422 is connected with the connection assembly 2421 through a chemical bond, so that the ventilation member 2422 is more firmly connected with the connection assembly 2421, the connection strength of the ventilation member 2422 and the connection assembly is ensured, the influence on the performance of the ventilation member 2422 is reduced to the minimum, and the performance of the ventilation member 2422 can be ensured. In addition, by adopting a chemical bond connection mode, an attachment gap can be prevented from being generated between the electrolyte and the first connecting part 2421a or the second connecting part 2421b through the air permeable member 2422, so that the electrolyte can be prevented from contacting or soaking the port of the air permeable member 2422, and the air permeable member 2422 can be prevented from swelling.

Referring to fig. 15 and 16, in some embodiments, a second recess 2413 is disposed on one of the first connecting element 2421a and the second connecting element 2421b, the second recess 2413 is formed by a surface of one of the first connecting element 2421a and the second connecting element 2421b being recessed away from the other, the air permeable member 2422 is at least partially accommodated in the second recess 2413, and a bottom wall and a side wall of the second recess 2413 are abutted against the air permeable member 2422.

As shown in fig. 15, a second recess 2413 may be provided to the second link 2421b, and of course, as shown in fig. 16, the second recess 2413 may be provided to the first link 2421 a.

The ventilation member 2422 may be partially accommodated in the second recess 2413, or may be entirely accommodated in the second recess 2413.

The first connection part 2421a or the second connection part 2421b is provided with a second recess 2413, the second recess 2413 forms a certain accommodating space, the ventilating member 2422 is arranged in the second recess 2413, the ventilating member 2422 can be abutted against the bottom wall and the side wall of the second recess 2413, the connecting component 2421 is only attached to the exhaust body 241 without being attached to the exhaust body 241, and the abutting form of the two is not limited in the application.

Through the arrangement, the ventilation component 2422 is favorably positioned, the ventilation component 2422 is prevented from moving in the radial direction of the first through hole 2423, the ventilation component 2422 is not required to be directly connected with the exhaust body 241, at least one of the first connecting piece 2421a and the second connecting piece 2421b is only required to be welded with the exhaust body 241, the assembly connection process is simplified, the ventilation component 2422 can be better fixed on the second concave part 2413, the ventilation component is more stable, an assembly structure is provided for the whole exhaust mechanism, and flexible design and assembly are facilitated.

Referring to fig. 17 to 19, in some embodiments, the exhaust body 241 is the end cap 23 of the battery cell 20. That is, the vent 24 may be provided at the end cap 23 of the battery cell 20.

Through the arrangement, the end cover 23 of the single battery 20 is integrally integrated with an exhaust function, and the safety performance of the single battery 20 can be ensured.

It is understood that the above embodiments are exemplified by taking the exhaust body 241 as the end cap 23 of the battery cell 20.

Referring to FIG. 20, in some embodiments, a receiving cavity 2414 is formed within the exhaust body 241, the exhaust body 241 having a plurality of walls defining the receiving cavity 2414, at least one of the walls being provided with the exhaust mechanism 242.

At least one wall of the exhaust body 241 is provided with the exhaust mechanism 242, the exhaust mechanism 242 may be provided on only one wall, or the exhaust mechanisms 242 may be provided on all the walls. The venting mechanism 242 may be disposed on the outer surface of the wall or may be disposed on the inner surface of the wall.

The exhaust body 241 may be in various shapes, for example, a rectangular parallelepiped, a cylinder. Taking the exhaust body 241 as a rectangular parallelepiped, the exhaust body 241 may have five walls, a bottom wall 2415a and four side walls 2415b jointly enclose and form an accommodating cavity 2414 with an opening at one end, and the bottom wall 2415a is provided with the exhaust mechanism 242. Taking the exhaust body 241 as a cylinder as an example, the exhaust body 241 may have two walls, a bottom wall 2415a and a circumferential wall, the circumferential wall encloses the edge of the bottom wall 2415a, the circumferential wall and the bottom wall 2415a together enclose and form a receiving cavity 2414 with an open end, and the bottom wall 2415a is provided with the exhaust body 241.

In the present embodiment, since the accommodating cavity 2414 for accommodating the electrode assembly 22 is formed inside the exhaust body 241, the accommodating cavity 2414 is defined by the walls of the exhaust body 241, so that the exhaust device 24 is the case 21 capable of accommodating the electrode assembly 22, and the exhaust device 24 integrates the accommodating function and the pressure relief function.

The embodiment of the application provides a battery cell 20, which comprises the exhaust device 24 provided by any embodiment.

The embodiment of the application provides a battery, including the battery cell 20 that any one of the above-mentioned embodiments provided and the box, the box is used for holding the battery cell 20.

An embodiment of the present application provides an electric device, including the battery provided in any of the above embodiments, for providing electric energy.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The above embodiments are merely for illustrating the technical solutions of the present application and are not intended to limit the present application, and those skilled in the art can make various modifications and variations of the present application. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An exhaust device for a battery cell, the exhaust device comprising:

an exhaust body;

the exhaust mechanism is arranged on the exhaust body and comprises a connecting assembly and a breathable member, the connecting assembly is used for connecting the exhaust body, the connecting assembly comprises a first connecting piece and a second connecting piece, a first through hole used for being communicated with the interior of the single battery is formed in the first connecting piece, a second through hole used for being communicated with the exterior of the single battery is formed in the second connecting piece, and the breathable member is used for being communicated with the first through hole and the second through hole and exhausting gas to the exterior of the single battery through the first through hole and the second through hole when the gas pressure in the single battery reaches a threshold value;

the first connecting piece is used for being attached to the surface, facing the interior of the battery cell, of the air permeable member, the second connecting piece is used for being attached to the surface, facing away from the interior of the battery cell, of the air permeable member, and the orthographic projection of the first through hole on the air permeable member and the orthographic projection of the second through hole on the air permeable member are arranged in a staggered mode.

2. The exhaust apparatus according to claim 1, wherein the number of the first through holes is plural and the first through holes are spaced apart from each other on the first connecting member, and a first connecting portion is formed between two adjacent first through holes, and the first connecting portion is used for being attached to a side surface of the gas permeable member facing the inside of the battery cell.

3. The exhaust apparatus according to claim 2, wherein the first connector includes a first body region for connecting the exhaust body and a first exhaust region including a plurality of the first through holes and the first connection portion, a portion of the gas permeable member facing the inner surface of the battery cell is attached to the first body region, another portion is attached to the first connection portion, and an orthographic projection of at least one of the first body region and the first connection portion on the gas permeable member covers an orthographic projection of the second through hole on the gas permeable member.

4. The exhaust device according to any one of claims 1 to 3, wherein the second through holes are distributed at intervals on the second connecting piece, and a second connecting portion is formed between two adjacent second through holes and is used for being attached to a surface of the air-permeable member, which faces away from the inside of the battery cell.

5. The exhaust apparatus as claimed in claim 4, wherein the second connector includes a second body region for connecting the exhaust body and a second exhaust region including a plurality of the second through holes and the second connecting portion, a portion of the gas permeable member facing away from the inner surface of the battery cell is attached to the second body region, and another portion is attached to the second connecting portion, and an orthographic projection of at least one of the second body region and the second connecting portion on the gas permeable member covers an orthographic projection of the first through hole on the gas permeable member.

6. The exhaust apparatus according to any one of claims 1 to 3, wherein the exhaust body is provided separately from the exhaust mechanism, and the exhaust mechanism is connected to the exhaust body by at least one of the first connecting member and the second connecting member.

7. The exhaust apparatus as claimed in claim 6, wherein the exhaust body has a third through hole extending in an axial direction of the first through hole, the third through hole for accommodating at least a part of the exhaust mechanism.

8. The exhaust apparatus according to claim 7, wherein the third through hole is a stepped hole, the third through hole includes a first hole section, a second hole section, and a first step surface connecting a hole wall of the first hole section and a hole wall of the second hole section, the first step surface supporting one of the first connecting piece and the second connecting piece.

9. The exhaust apparatus of claim 8, wherein the third bore further comprises a third bore section and a second step face connecting the bore wall of the second bore section and the bore wall of the third bore section, the second step face for supporting the other of the first and second connectors.

10. An exhaust apparatus according to any one of claims 1 to 3, wherein the exhaust body has a first recess recessed in an axial direction of the first through hole, one of the first and second connectors is formed in a bottom wall of the first recess, the gas permeable member is located in the first recess, and the other of the first and second connectors is located at least partially in the first recess and is provided separately from the exhaust body.

11. An exhaust apparatus according to any one of claims 1 to 3, wherein at least one of the first connecting member and the second connecting member is welded to the exhaust body with a gap formed between the gas permeable member and the exhaust body in a radial direction of the first through hole.

12. The exhaust apparatus according to any one of claims 1 to 3, wherein the ventilation member comprises a ventilation film, a surface of the ventilation film facing the inside of the battery cell is attached to the first connecting member, and a surface of the ventilation film facing away from the inside of the battery cell is attached to the second connecting member.

13. The exhaust apparatus according to any one of claims 1 to 3, wherein the ventilation member includes a first ventilation film, a second ventilation film, and a third ventilation film that are stacked in an axial direction of the first through hole, a surface of the first ventilation film facing the inside of the battery cell is attached to the first connecting member, a surface of the third ventilation film facing away from the inside of the battery cell is attached to the second connecting member, and a ventilation amount of the second ventilation film is larger than a ventilation amount of the first ventilation film and a ventilation amount of the third ventilation film.

14. The exhaust apparatus as claimed in claim 13, wherein the melting point of the second gas permeable membrane is higher than the melting point of the first gas permeable membrane and the melting point of the third gas permeable membrane.

15. The exhaust apparatus according to claim 13, wherein the number of the second gas permeable membranes is two or more, the two or more second gas permeable membranes are each located between the first gas permeable membrane and the third gas permeable membrane, and the two or more second gas permeable membranes are stacked in the axial direction.

16. An exhaust device according to any one of claims 1 to 3, wherein a gas permeable member is integrally chemically keyed to at least one of the first and second connectors.

17. The exhaust apparatus according to any one of claims 1 to 3, wherein a second recess is provided in one of the first connecting member and the second connecting member, the second recess is formed by a surface of the one of the first connecting member and the second connecting member being recessed away from the other, the air-permeable member is at least partially accommodated in the second recess, and a bottom wall and a side wall of the second recess abut against the air-permeable member.

18. An exhaust device according to any one of claims 1 to 3, wherein the exhaust body has a receiving cavity formed therein, the exhaust body having a plurality of walls defining the receiving cavity, at least one wall being provided with the exhaust means.

19. A vent apparatus according to any one of claims 1 to 3, wherein the vent body is an end cap of the cell.

20. A battery cell, characterized in that it comprises a venting device according to any one of claims 1 to 19.

21. A battery, comprising:

the battery cell of claim 20; and

and the box body is used for accommodating the battery monomer.

22. An electrical device comprising a battery as claimed in claim 21 for providing electrical energy.