Battery monomer, battery and electric equipment

Abstract

The utility model discloses a battery monomer, a battery and electric equipment. The battery cell includes a housing, an exhaust valve, and a seal. The wall part of the shell is provided with an exhaust hole. The exhaust valve comprises a metal sheet and a fixing piece which are connected with each other, the metal sheet blocks the exhaust hole, and the fixing piece is configured to deform in response to temperature increase so that the metal sheet can be separated from the state of blocking the exhaust hole; and the sealing piece is arranged between the metal sheet and the wall part of the shell, surrounds the exhaust hole and is used for sealing a gap between the metal sheet and the wall part of the shell. Wherein the metal sheet comprises a main body part and an edge part which are connected, the edge part is arranged around the main body part, the edge part is connected to the sealing piece in a pressing mode, and at least one part of the main body part protrudes out of the edge part in the axial direction of the exhaust hole. The structure can effectively improve the reliability of the battery monomer.

Description

Technical Field

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

[0002] With the development of new energy technology, batteries are being used more and more widely. Batteries have high energy density, high safety, long service life, and are green and environmentally friendly to the social environment. They have been widely used in passenger cars, commercial vehicles, electric bicycles, heavy trucks, energy storage facilities, battery swap stations, engineering manufacturing, smart equipment, etc. At the same time, they also promote technical development and research in communications, medical equipment, energy development, etc.

[0003] In the battery production process, how to improve the reliability of battery cells is a technical problem that needs to be solved urgently. Utility Model Content

[0004] The embodiments of the present application provide a battery cell, a battery and an electrical device, which can effectively improve the reliability of the battery cell.

[0005] In a first aspect, an embodiment of the present application provides a battery cell, the battery cell comprising a shell, an exhaust valve and a seal. The wall of the shell is provided with an exhaust hole; the exhaust valve comprises a metal sheet and a fixing member connected to each other, the metal sheet blocks the exhaust hole, the fixing member is configured to deform in response to an increase in temperature so that the metal sheet is out of the state of blocking the exhaust hole; the seal is provided between the metal sheet and the wall of the shell and is provided around the exhaust hole, the seal is used to seal the gap between the metal sheet and the wall of the shell;

[0006] The metal sheet includes a main body and an edge portion connected to each other. The edge portion is arranged around the main body and is crimped to the seal. Along the axial direction of the exhaust hole, at least a part of the main body protrudes from the edge portion.

[0007] In the above technical solution, at least a portion of the main body protrudes from the edge portion, and the portion of the main body protruding from the edge portion can enhance the cross-sectional stiffness of the main body, improve the stiffness of the metal sheet, improve the ability of the metal sheet to resist deformation, and reduce the risk of metal sheet deformation, thereby reducing the risk of sealing failure caused by metal sheet deformation, improving the sealing of the battery cell, and improving the reliability of the battery cell.

[0008] In some embodiments, at least a portion of the main body protrudes from the edge portion in a direction away from the fixing member.

[0009] In the above technical solution, the part of the main body protruding from the edge part protrudes in a direction opposite to the deformation direction of the metal sheet caused by gas production inside the battery cell. In this way, the part of the main body protruding from the edge part can resist the deformation of the metal sheet in a direction opposite to the direction of the force causing the deformation of the metal sheet, further reducing the risk of metal sheet deformation.

[0010] In some embodiments, a cavity is formed between at least a portion of the main body and the fixing member.

[0011] In the above technical solution, the cavity can reduce the contact area between the metal sheet and the fixing part, so that the fixing part can release the metal sheet in time, so that the metal sheet is out of the state of blocking the exhaust hole, thereby improving the response speed of the exhaust valve.

[0012] In some embodiments, the main body has a first surface facing the fixing element, the cavity is formed between the first surface and the fixing element, and the distance between the first surface and the fixing element gradually decreases from the center of the main body to the edge.

[0013] In the above technical solution, the distance between the first surface and the fixing part gradually decreases from the center of the main body to the edge, so that a cavity is formed between the first surface and the fixing part, which greatly reduces the contact area between the main body and the fixing part.

[0014] In some embodiments, the main body has a second surface facing away from the fixing element, and the distance between the second surface and the fixing element gradually decreases from the center of the main body to the edge portion.

[0015] In the above technical solution, the distance between the second surface and the fixing member gradually decreases from the center to the edge of the main body, so that a metal sheet with greater central rigidity of the main body can be obtained.

[0016] In some embodiments, the main body portion includes at least one protrusion, which protrudes from the edge portion in a direction away from the fixing member, and the cavity is formed between the protrusion and the fixing member.

[0017] In the above technical solution, the protrusion increases the complexity of the cross section of the main body, thereby improving the cross section rigidity of the main body. At the same time, a cavity is formed between the protrusion and the fixing member, thereby reducing the contact area between the fixing member and the main body. Therefore, when the internal temperature of the battery cell reaches a threshold, the fixing member can release the metal sheet in time, so that the metal sheet is out of the state of blocking the exhaust hole, thereby improving the response speed of the exhaust valve.

[0018] In some embodiments, a plurality of the protrusions are provided, and the plurality of the protrusions are arranged at intervals.

[0019] In the above technical solution, a plurality of protrusions are arranged at intervals, and the cross-sectional rigidity of the main body is enhanced by using smaller material intervals.

[0020] In some embodiments, the main body further includes a connecting portion, two adjacent protrusions are connected by the connecting portion, and the connecting portion is in contact with the fixing member.

[0021] In the above technical solution, the connection part is in contact with the fixing part, which can improve the fixing effect of the fixing part on the main part, thereby improving the fixing effect of the fixing part on the metal sheet and reducing the risk of metal sheet displacement in normal use of the battery cell.

[0022] In some embodiments, the main body includes a first protrusion, a second protrusion and a third protrusion, and the first protrusion, the second protrusion and the third protrusion are arranged in sequence along the first direction. Along the second direction, the size of the second protrusion is larger than the size of the first protrusion, and the size of the second protrusion is larger than the size of the third protrusion. The first direction, the second direction and the axial direction of the exhaust hole are perpendicular to each other.

[0023] In the above technical solution, along the second direction, the size of the second protrusion is larger than the size of the first protrusion, and the size of the second protrusion is larger than the size of the third protrusion. In this way, along the second direction, the size of the second protrusion is larger, which can increase the cross-sectional rigidity of the main body to a greater extent in the second direction and improve the ability of the main body to resist deformation risk. In this way, along the second direction, the first protrusion and the second protrusion are smaller, and the size occupies less.

[0024] In some embodiments, the first protrusion and the third protrusion are symmetrically arranged about the second protrusion.

[0025] In the above technical solution, the first protrusion and the third protrusion are symmetrically arranged, and the first protrusion and the third protrusion can evenly strengthen the cross-sectional rigidity of the main body on both sides of the second protrusion.

[0026] In some embodiments, along the axial direction of the exhaust hole, the projection of the first protrusion is fan-shaped, and / or the projection of the third protrusion is fan-shaped.

[0027] In the above technical solution, the projection of the first protrusion is fan-shaped, and such a first protrusion can provide better stress distribution. The projection of the third protrusion is fan-shaped, and such a third protrusion can provide better stress distribution.

[0028] In some embodiments, the metal sheet is an aluminum sheet.

[0029] In some embodiments, the battery cell further includes a pressure relief mechanism, and the pressure relief mechanism is disposed on a wall portion of the housing.

[0030] In a second aspect, an embodiment of the present application provides a battery, the battery comprising the battery cell provided in the first aspect.

[0031] In a third aspect, an embodiment of the present application provides an electrical device, the electrical device comprising the above-mentioned battery cell or the above-mentioned battery, wherein the battery cell or the battery is used to supply power to the electrical device. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0033] Figure 1 A schematic diagram of the structure of a vehicle according to some embodiments of the present application;

[0034] Figure 2 An exploded schematic diagram of a battery according to some embodiments of the present application;

[0035] Figure 3 An exploded schematic diagram of a battery cell according to some embodiments of the present application;

[0036] Figure 4 A schematic structural diagram of a battery cell from one perspective of some embodiments of the present application;

[0037] Figure 5 It is an exploded schematic diagram of the end cover and the exhaust valve;

[0038] Figure 6 for Figure 4 Partial cross-sectional view along AA;

[0039] Figure 7 for Figure 4 Schematic diagram of the partial structure of the middle end cover;

[0040] Figure 8 This is a schematic diagram of the structure of the metal sheet in some embodiments of the present application;

[0041] Fig. 9 for Figure 6 A schematic structural diagram of another embodiment of the metal sheet;

[0042] Fig.10 Schematic diagrams of the structures of metal sheets in other embodiments of the present application;

[0043] Fig.11 for Fig.10 Sectional view along BB;

[0044] Fig.12 This is a schematic diagram of the structure of the fixing parts of some embodiments of the present application.

[0045] Icons: 1000-vehicle; 200-motor; 300-controller; 100-battery; 10-battery cell; 11-housing; 111-housing; 112-end cover; 1121-exhaust hole; 1122-sink; 1214-liquid injection hole; 1215-limiting groove; 1216-fourth surface; 1216b-first area; 1216a-second area; 12-exhaust valve; 121-metal sheet; 1211-main body; 12111-first surface; 12112-second surface; 12113-protrusion; 12113a-first protrusion ;12113b-second protrusion;12113c-third protrusion;12114-connecting portion;1212-edge portion;1213-cavity;122-fixing member;1221-first part;1222-second part;1223-third surface;1224-fifth surface;13-pressure ring;14-sealing member;15-insulating member;17-electrode assembly;18-electrode terminal;19-pressure relief mechanism;20-box;21-first sub-box;22-second sub-box;23-accommodating space;X-first direction;Y-second direction;P-axial direction.

[0046] The drawings are not drawn to scale. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0048] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0049] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0050] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0051] In the description of the present application, it should be noted that, unless otherwise specified, "multiple" means more than two; the terms "upper", "lower", "left", "right", "inside", "outside", etc., indicating the orientation or positional relationship, are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. "Vertical" is not strictly vertical, but is within the allowable error range. "Parallel" is not strictly parallel, but is within the allowable error range.

[0052] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0053] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0054] The term "plurality" used in the present application refers to two or more (including two).

[0055] In the present application, battery cells may include but are not limited to lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries or magnesium-ion batteries, etc. Battery cells include but are not limited to cylinders, flat bodies, rectangular parallelepipeds or other shapes, etc. Battery cells generally include cylindrical battery cells, square battery cells and soft-pack battery cells, etc., according to the packaging method.

[0056] A battery cell includes an electrode assembly and an electrolyte. The electrode assembly is composed of a positive electrode sheet, a negative electrode sheet, and a separator. A battery cell mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. Metal ions (such as lithium ions) are embedded and removed between the positive electrode and the negative electrode. The separator is set between the positive electrode and the negative electrode to prevent the positive electrode sheet and the negative electrode sheet from short-circuiting, while allowing active ions to pass through.

[0057] The positive electrode sheet includes a positive electrode collector and a positive electrode active material layer. The positive electrode active material layer is coated on the surface of the positive electrode collector. The positive electrode collector not coated with the positive electrode active material layer protrudes from the positive electrode collector coated with the positive electrode active material layer. The positive electrode collector not coated with the positive electrode active material layer serves as a positive electrode ear.

[0058] Taking lithium-ion batteries as an example, the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc. The positive electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, carbon electrode, carbon, nickel or titanium, etc. can be used. The composite current collector may include a polymer material base and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0059] The negative electrode sheet includes a negative electrode collector and a negative electrode active material layer. The negative electrode active material layer is coated on the surface of the negative electrode collector. The negative electrode collector not coated with the negative electrode active material layer protrudes from the negative electrode collector coated with the negative electrode active material layer. The negative electrode collector not coated with the negative electrode active material layer serves as a negative electrode tab.

[0060] The negative electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, carbon electrode, carbon, nickel or titanium may be used. The negative electrode active material may be carbon or silicon.

[0061] In order to ensure that a large current does not melt, the number of positive electrode tabs is multiple and stacked together, and the number of negative electrode tabs is multiple and stacked together. The material of the isolation film can be PP (polypropylene) or PE (polyethylene). In addition, the electrode assembly can be a winding structure or a laminated structure.

[0062] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in the present application may include a battery module or a battery pack. The battery generally includes a box for encapsulating one or more battery cells. The box can reduce the impact of liquid or other foreign matter on the charging or discharging of the battery cells.

[0063] In some embodiments, the battery may be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0064] In some embodiments, the battery may be a battery pack, which includes a case and battery cells, wherein the battery cells or battery modules are accommodated in the case.

[0065] In some embodiments, multiple battery cells may be first integrated into at least one battery module, and then the battery module may be installed in a box to form a battery pack. In this embodiment, auxiliary structural members such as beams may be provided between the battery modules to improve the installation stability of the battery module in the box.

[0066] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0067] In some embodiments, the battery may be an energy storage device, which includes an energy storage container, an energy storage cabinet, and the like.

[0068] The development of battery technology must take into account many design factors at the same time, such as energy density, cycle life, discharge capacity, charge and discharge rate and other performance parameters. In addition, battery reliability must also be considered.

[0069] When there are defects in the battery cell or the battery cell design, the battery cell will experience thermal runaway, causing the internal pressure of the battery cell to rise sharply. Therefore, a pressure-controlled pressure relief mechanism is provided on the battery cell housing, such as an explosion-proof valve, explosion-proof plate, etc., to release pressure when the battery cell thermally runs away and the internal pressure reaches a certain level, thereby alleviating the spread of thermal runaway. This pressure relief mechanism has a slow response speed, and when the temperature inside the battery cell rises, there is a risk that the battery cell will explode before the pressure is released.

[0070] To this end, in the related art, an exhaust hole is provided on the end cover of the battery cell and the exhaust hole is controlled by a temperature-sensitive exhaust valve, and the exhaust hole and the exhaust valve are sealed by a sealing member.

[0071] Seals have an important impact on the sealing of battery cells. Seal failure will affect the reliability of battery cells. There are many reasons for seal failure, for example, seal aging can lead to seal failure, insufficient seal compression can lead to seal failure, and inappropriate seal size can lead to seal failure. These seal failures can be detected by sealing tests after the battery cells are assembled and before the battery cells are used. However, seal failures during the use of battery cells are often difficult to notice.

[0072] Specifically, when the battery cell is used normally, gas is generated inside the battery cell. The gas pressure acts on the metal sheet of the exhaust valve through the exhaust hole, causing the metal sheet to deform, the sealing ring to be insufficiently compressed or the sealing ring to age rapidly, resulting in seal failure and reduced reliability of the battery cell.

[0073] In view of this, in order to solve the problem of metal sheet deformation, battery cell sealing failure and reduced battery cell reliability, an embodiment of the present application provides a technical solution, in which the metal sheet includes a connected main body and an edge portion, the edge portion is arranged around the main body, the edge portion is crimped to the seal, and along the axial direction of the exhaust hole, at least a portion of the main body protrudes from the edge portion.

[0074] By having at least a portion of the main body protrude from the edge portion, the cross-sectional stiffness of the main body is enhanced, the stiffness of the metal sheet is improved, the ability of the metal sheet to resist deformation is improved, and the risk of metal sheet deformation is reduced, thereby reducing the risk of sealing failure of the seal due to metal sheet deformation, improving the sealing of the battery cell, and improving the reliability of the battery cell.

[0075] The technical solutions disclosed in the embodiments of the present application are applicable to but not limited to batteries and electrical equipment using batteries.

[0076] Electrical equipment can be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys and electric tools, etc. Vehicles can be fuel vehicles, gas vehicles or new energy vehicles. New energy vehicles can be pure electric vehicles, hybrid vehicles or extended-range vehicles, etc. Spacecraft include airplanes, rockets, space shuttles and spacecrafts, etc. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric airplane toys, etc. Electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric planers, etc.

[0077] For the convenience of description, the following embodiments are described by taking the electric device as a vehicle 1000 as an example.

[0078] Please refer to Figure 1 , Figure 1 1 is a schematic diagram of the structure of a vehicle 1000 according to some embodiments of the present application. A battery 100 is disposed inside the vehicle 1000. The battery 100 may be disposed at the bottom, head, or tail of the vehicle 1000. The battery 100 may be used to power the vehicle 1000. For example, the battery 100 may be used as an operating power source for the vehicle 1000.

[0079] The vehicle 1000 may further include a controller 300 and a motor 200 , wherein the controller 300 is used to control the battery 100 to supply power to the motor 200 , for example, to meet the power requirements of starting, navigating, and driving the vehicle 1000 .

[0080] In some embodiments of the present application, the battery 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0081] In some embodiments, please refer to Figure 2 , Figure 2 The battery 100 of some embodiments of the present application is an exploded schematic diagram, and the battery 100 includes a plurality of battery cells 10. The plurality of battery cells 10 can be connected in series, in parallel, or in mixed connection. Mixed connection means that the plurality of battery cells 10 are connected in series and in parallel.

[0082] In some embodiments, the battery 100 may further include a busbar component (not shown), and the multiple battery cells 10 may be electrically connected via the busbar component to achieve series connection, parallel connection, or mixed connection of the multiple battery cells 10 .

[0083] The busbar component may be a metal conductor, such as copper, iron, aluminum, steel, aluminum alloy, etc.

[0084] In some embodiments, the battery 100 may further include a box 20, which is used to accommodate the battery cell 10. The box 20 may include a first sub-box 21 and a second sub-box 22, which cover each other to define an accommodating space 23 for accommodating the battery cell 10. Of course, the connection between the first sub-box 21 and the second sub-box 22 may be sealed by a sealing element (not shown), which may be a sealing ring, a sealant, etc.

[0085] The first sub-box 21 and the second sub-box 22 may be in various shapes, such as a cuboid, a cylinder, etc. The first sub-box 21 may be a hollow structure with one side open, and the second sub-box 22 may also be a hollow structure with one side open, and the open side of the second sub-box 22 covers the open side of the first sub-box 21, thereby forming a box 20 with a receiving space 23. Of course, the first sub-box 21 may be a hollow structure with one side open, and the second sub-box 22 may be a plate-shaped structure, and the second sub-box 22 covers the open side of the first sub-box 21, thereby forming a box 20 with a receiving space 23.

[0086] Please refer to Figure 3 , Figure 3 This is a schematic diagram of an exploded view of a battery cell 10 according to some embodiments of the present application. The battery cell 10 may include a housing 111 , an electrode assembly 17 , an end cover 112 , and other functional components.

[0087] The shell 111 is a component for accommodating the electrode assembly 17. The shell 111 can be a hollow structure with an opening at one end, or a hollow structure with openings at both ends. The shell 111 can be made of a variety of materials, such as copper, iron, aluminum, steel, aluminum alloy, etc. The shell 111 can be in a variety of shapes, such as a cylinder, a cuboid, etc. For example, in Figure 3 In the embodiment, the housing 111 is a rectangular parallelepiped.

[0088] The end cap 112 is a component that covers the opening of the shell 111 to isolate the internal environment of the battery cell 10 from the external environment. The end cap 112 covers the opening of the shell 111, and the end cap 112 and the shell 111 together define a sealed space for accommodating the electrode assembly 17, the electrolyte and other functional components. The shape of the end cap 112 can be adapted to the shape of the shell 111. For example, the shell 111 is a rectangular parallelepiped structure, and the end cap 112 is a rectangular plate structure adapted to the shell 111. For another example, the shell 111 is a cylindrical structure, and the end cap 112 is a circular plate structure adapted to the shell 111. The material of the end cap 112 can also be a variety of materials. For example, the end cap 112 can be a metal material, such as copper, iron, aluminum, steel, aluminum alloy, etc. The material of the end cap 112 can be the same as or different from the material of the shell 111.

[0089] In the battery cell 10, there can be one or two end caps 112. If the shell 111 is a hollow structure with an opening at one end, one end cap 112 is provided accordingly; if the shell 111 is a hollow structure with openings at both ends, two end caps 112 are provided accordingly, and the two end caps 112 cover the two openings of the shell 111 respectively.

[0090] In some embodiments, a liquid injection hole 1214 may be provided on the end cover 112 to facilitate the injection of electrolyte into the battery cell 10 or the replenishment of electrolyte.

[0091] In some embodiments, an electrode terminal 18 is disposed on the end cap 112 . Optionally, two electrode terminals 18 are provided, one is a positive terminal and the other is a negative terminal.

[0092] In some embodiments, an insulating member 15 may be further provided on the inner surface of the end cover 112 to insulate the end cover 112 from the interior of the battery cell 10. Optionally, the insulating member 15 is a lower plastic.

[0093] The embodiment of the present application provides a battery cell 10, which can improve the sealing of the battery cell 10 and enhance the reliability of the battery cell 10. The specific structure of the battery cell 10 is described in detail below with reference to the accompanying drawings.

[0094] Figure 4 A schematic structural diagram of a battery cell 10 from one perspective in some embodiments of the present application; Figure 5 is an exploded schematic diagram of the end cover 112 and the exhaust valve 12; Figure 6 for Figure 4 Partial cross-sectional view along AA; Figure 7 for Figure 6 A schematic diagram of the partial structure of the middle end cover 112.

[0095] Reference Figures 3 to 7 The embodiment of the present application provides a battery cell 10, which includes a shell 11, an exhaust valve 12 and a seal 14. The wall of the shell 11 is provided with an exhaust hole 1121. The exhaust valve 12 includes a metal sheet 121 and a fixing member 122 connected to each other, the metal sheet 121 blocks the exhaust hole 1121, and the fixing member 122 is configured to deform in response to an increase in temperature so that the metal sheet 121 is out of the state of blocking the exhaust hole 1121; the seal 14 is arranged between the metal sheet 121 and the wall of the shell 11, and is arranged around the exhaust hole 1121, and the seal 14 is used to seal the gap between the metal sheet 121 and the wall of the shell 11.

[0096] The metal sheet 121 includes a main body 1211 and an edge 1212 connected to each other. The edge 1212 is arranged around the main body 1211 and is crimped to the seal 14 . Along the axial direction P of the exhaust hole 1121 , at least a portion of the main body 1211 protrudes from the edge 1212 .

[0097] The position of the exhaust hole 1121 can be set according to specific needs. The exhaust hole 1121 is set on the end cover 112, or the exhaust hole 1121 can also be set on the bottom wall or side wall of the shell 111. Optionally, the exhaust hole 1121 is set on the end cover 112. The drawings show the situation where the exhaust hole 1121 is set on the end cover 112.

[0098] In some embodiments, the vent hole 1121 may penetrate the inner surface and the outer surface of the end cap 112, wherein the outer surface of the end cap 112 is the outer side of the end cap 112, and the inner surface of the end cap 112 is the surface of the end cap 112 facing the inside of the battery cell 10. Figure 7 As shown, a sink 1122 may be provided on the outer surface of the end cover 112 , and a drainage hole is provided at the bottom of the sink 1122 . The sink 1122 is used to accommodate at least a portion of the exhaust valve 12 .

[0099] The exhaust valve 12 is a component that uses temperature changes to control the opening of the exhaust hole 1121. The exhaust valve 12 can be understood as a temperature-sensitive exhaust valve 12. The exhaust valve 12 is sensitive to temperature. It can be understood that when the battery cell 10 is not in thermal runaway, the exhaust valve 12 needs to block the exhaust hole 1121, which requires the exhaust valve 12 to have good sealing properties. When the battery cell 10 is in thermal runaway, the exhaust valve 12 needs to release the exhaust hole 1121 in time, which requires the exhaust valve 12 to be able to respond immediately.

[0100] The fixing member 122 is a component used to fix the metal sheet 121 . Under the action of the fixing member 122 , the position of the metal sheet 121 is fixed, so that the metal sheet 121 can be stably blocked in the exhaust hole 1121 .

[0101] The fixing member 122 is configured to deform in response to an increase in temperature, which means that the fixing member 122 softens or plastically deforms as the temperature increases, that is, the fixing member 122 is sensitive to temperature and can deform after being heated. Therefore, the fixing member 122 can be made of a material with low strength that can deform as the temperature increases.

[0102] Specifically, when the battery cell 10 is not in thermal runaway, the fixing member 122 is not deformed, and the fixing member 122 can fix the metal sheet 121. Under the action of the fixing member 122, the metal sheet 121 can stably block the exhaust hole 1121. When the battery cell 10 is in thermal runaway, the fixing member 122 is deformed, and the fixing action of the fixing member 122 on the metal sheet 121 is weakened, resulting in displacement of the metal sheet 121 relative to the exhaust hole 1121, and the exhaust hole 1121 is partially or completely released.

[0103] The fixing member 122 is configured to deform in response to an increase in temperature so as to release the metal sheet 121 from a state of blocking the exhaust hole 1121. That is, after the fixing member 122 is deformed, the fixation of the metal sheet 121 by the fixing member 122 is weakened, causing the metal sheet 121 to be displaced relative to the exhaust hole 1121, and the exhaust hole 1121 is partially or completely released.

[0104] It should be understood that the fixing member 122 itself has a fixed melting point. When the temperature is lower than the melting point, the fixing member 122 will not deform. Due to different chemical systems of the battery cells 10 or different sizes of the battery cells 10, the temperature inside the battery cells 10 is different, and the melting point requirements of the fixing member 122 are also different. Therefore, different materials can be selected as needed to prepare the fixing member 122 to obtain the fixing member 122 with the required melting point. The material of the fixing member 122 includes but is not limited to polyethylene, polypropylene, etc.

[0105] The metal sheet 121 is a component for blocking the exhaust hole 1121, and the metal sheet 121 can be understood as a metal sheet. The formation of the metal sheet 121 can be various, and the metal sheet 121 can be constructed as a circular sheet, a rectangular sheet, etc., as long as it can block the exhaust hole 1121. The material of the metal sheet 121 includes but is not limited to aluminum, copper, stainless steel, nickel and their alloys. Since the metal sheet 121 will contact the gas or liquid in the battery cell 10, this requires the metal sheet 121 to have good anti-permeability and structural strength. Therefore, the metal sheet 121 can be made of a material with high strength, good anti-permeability and not easy to deform. Optionally, the metal sheet 121 is an aluminum pressed sheet, and such a metal sheet 121 is light in weight and has good anti-permeability.

[0106] The seal 14 is a component that seals between the housing 11 and the metal sheet 121. The material of the seal 14 includes but is not limited to rubber, silicone, etc. Optionally, the seal 14 is an O-ring. Figure 7 As shown, a limiting groove 1215 may be provided on a side of the end cover 112 facing the exhaust valve 12 , and at least a portion of the seal 14 is accommodated in the limiting groove 1215 to reduce the risk of displacement of the seal 14 .

[0107] The metal sheet 121 includes a main body 1211 and an edge 1212 connected to each other. The main body 1211 is the middle area of ​​the metal sheet 121. The structure of the main body 1211 has an important influence on the rigidity of the metal sheet 121. The edge 1212 is an area extending around the periphery of the main body 1211. The edge 1212 can be understood as the edge area of ​​the metal sheet 121. The main body 1211 and the edge 1212 can be integrally formed, or they can be prepared separately and then fixedly connected.

[0108] The edge portion 1212 is pressed against the sealing member 14 , that is, the edge of the metal sheet 121 is pressed against the sealing member 14 .

[0109] Along the axial direction P of the exhaust hole 1121, at least a portion of the main body 1211 protrudes from the edge portion 1212. In the embodiment where the exhaust hole 1121 is provided in the end cover 112, the exhaust hole 1121 can be understood as the thickness direction of the end cover 112. It can be understood that along the axial direction P of the exhaust hole 1121, the edge portion 1212 has two opposite surfaces, and at least a portion of the main body 1211 protrudes from one surface or two surfaces of the edge portion 1212. Among them, the main body 1211 can be completely protruded from the edge portion 1212 (such as Figure 6 ), or may only partially protrude from the edge portion 1212 (as shown in Fig. 9 shown).

[0110] The main body 1211 may be formed by stamping, so that at least a portion of the main body 1211 protrudes from the edge 1212. The main body 1211 may also be formed by welding a multi-segment structure, so that at least a portion of the main body 1211 protrudes from the edge 1212.

[0111] At least a portion of the main body 1211 protrudes from the edge 1212 , wherein the protruding direction of the main body 1211 can be the direction from the metal sheet 121 to the fixing member 122 , or the direction from the metal sheet 121 to the fixing member 122 .

[0112] In this embodiment, at least a portion of the main body 1211 protrudes from the edge portion 1212. The portion of the main body 1211 that protrudes from the edge portion 1212 can enhance the cross-sectional stiffness of the main body 1211, improve the stiffness of the metal sheet 121, improve the ability of the metal sheet 121 to resist deformation, and reduce the risk of deformation of the metal sheet 121, thereby reducing the risk of sealing failure of the seal 14 due to deformation of the metal sheet 121, improving the sealing of the battery cell 10, and improving the reliability of the battery cell 10.

[0113] In some embodiments, along the axial direction P of the exhaust hole 1121, the projection of the edge portion 1212 completely covers the seal 14, and the projection of the main body 1211 does not overlap with the seal 14. In this way, the edge portion 1212 can be pressed against the seal 14 stably, reducing the influence of the main body 1211 on the seal 14.

[0114] In some embodiments, at least a portion of the main body 1211 protrudes from the edge portion 1212 in a direction away from the fixing element 122 .

[0115] The direction away from the fixing member 122 can be understood as the direction of the metal sheet 121 toward the exhaust hole 1121. For example, Figure 6 and Fig. 9 In the embodiment, at least a portion of the main body portion 1211 protrudes downward from the edge portion 1212 .

[0116] A portion of the main body 1211 may protrude from the edge portion 1212 in a direction away from the fixing member 122 , or the entire main body 1211 may protrude from the edge portion 1212 in a direction away from the fixing member 122 .

[0117] In this embodiment, the direction in which the portion of the main body 1211 protruding from the edge portion 1212 protrudes is opposite to the deformation direction of the metal sheet 121 caused by gas production inside the battery cell 10. In this way, the portion of the main body 1211 protruding from the edge portion 1212 can resist the deformation of the metal sheet 121 in the direction opposite to the direction of the force causing the deformation of the metal sheet 121, thereby further reducing the risk of deformation of the metal sheet 121.

[0118] Reference Figure 6 and Fig. 9 In some embodiments, a cavity 1213 is formed between at least a portion of the main body 1211 and the fixing member 122 .

[0119] The cavity 1213 is the unfilled space between the metal sheet 121 and the fixing member 122 .

[0120] The cavity 1213 can reduce the contact area between the metal sheet 121 and the fixing member 122 , so that when the battery cell 10 thermally runs away, the fixing member 122 can release the metal sheet 121 in time, so that the metal sheet 121 is out of the state of blocking the exhaust hole 1121 , thereby improving the response speed of the exhaust valve 12 .

[0121] The structure of the metal sheet 121 is described in detail below with reference to the accompanying drawings.

[0122] Figure 8 Schematic diagram of the structure of the metal sheet 121 according to some embodiments of the present application.

[0123] Reference Figure 6 and Figure 8In some embodiments, the main body 1211 has a first surface 12111 facing the fixing member 122, and a cavity 1213 is formed between the first surface 12111 and the fixing member 122. From the center of the main body 1211 to the edge 1212, the distance between the first surface 12111 and the fixing member 122 gradually decreases.

[0124] From the center of the main body 1211 to the edge 1212, the distance between the first surface 12111 and the fixing member 122 gradually decreases, wherein the trend of the distance reduction between the first surface 12111 and the fixing member 122 can be a linear change, and the trend of the distance reduction between the first surface 12111 and the fixing member 122 can also be an exponential change.

[0125] From the center of the main body 1211 to the edge 1212 , the distance between the first surface 12111 and the fixing member 122 gradually decreases, so that a cavity 1213 is formed between the first surface 12111 and the fixing member 122 , which greatly reduces the contact area between the main body 1211 and the fixing member 122 .

[0126] Continue to refer to Figure 6 and Figure 8 In some embodiments, the main body 1211 has a second surface 12112 facing away from the fixing member 122 , and the distance between the second surface 12112 and the fixing member 122 gradually decreases from the center of the main body 1211 to the edge 1212 .

[0127] From the center of the main body 1211 to the edge 1212, the distance between the second surface 12112 and the fixing member 122 gradually decreases, wherein the trend of the distance reduction between the second surface 12112 and the fixing member 122 can be a linear change, and the trend of the distance reduction between the first surface 12111 and the fixing member 122 can also be an exponential change.

[0128] In this embodiment, the distance between the second surface 12112 and the fixing member 122 gradually decreases from the center of the main body 1211 to the edge 1212 , so that the metal sheet 121 with greater rigidity at the center of the main body 1211 can be obtained.

[0129] In some embodiments, from the center of the main body 1211 to the edge 1212, the distance between the first surface 12111 and the fixing member 122 gradually decreases, and the distance between the second surface 12112 and the fixing member 122 gradually decreases. Optionally, the thickness between the first surface 12111 and the second surface 12112 is equal. In this embodiment, the first surface 12111 and the second surface 12112 are both conical surfaces, and the main body 1211 is approximately conical. Compared with the flat main body 1211, the main body 1211 is approximately conical, which can increase the cross-sectional area of ​​the main body 1211, improve the cross-sectional rigidity of the main body 1211, and reduce the risk of deformation of the metal sheet 121.

[0130] The above provides an embodiment in which the main body portion 1211 of the metal sheet 121 entirely protrudes beyond the edge portion 1212 .

[0131] The following provides an embodiment in which a portion of the main body 1211 of the metal sheet 121 protrudes from the edge portion 1212 .

[0132] Fig. 9 for Figure 6 A schematic structural diagram of another embodiment of the middle metal sheet 121; Fig.10 Schematic diagram of the structure of the metal sheet 121 of some other embodiments of the present application; Fig.11 for Fig.10 Section view along BB.

[0133] Reference Fig. 9 , Fig.10 and Fig.11 In some embodiments, the main body 1211 includes at least one protrusion 12113 , which protrudes from the edge portion 1212 in a direction away from the fixing member 122 , and a cavity 1213 is formed between the protrusion 12113 and the fixing member 122 .

[0134] The protrusion 12113 is a structure where the main body 1211 protrudes from the edge 1212. Optionally, the main body 1211 is punched to form the protrusion 12113. Punching can change the flow direction of the material without increasing the material consumption, thereby improving the cross-sectional rigidity of the main body 1211.

[0135] In this embodiment, the protrusion 12113 increases the complexity of the cross section of the main body 1211, thereby improving the cross section rigidity of the main body 1211. At the same time, the cavity 1213 is formed between the protrusion 12113 and the fixing member 122, thereby reducing the contact area between the fixing member 122 and the main body 1211, so that when the internal temperature of the battery cell 10 reaches the threshold, the fixing member 122 can release the metal sheet 121 in time, so that the metal sheet 121 is out of the state of blocking the exhaust hole 1121, thereby improving the response speed of the exhaust valve 12.

[0136] Reference Fig. 9 , Fig.10 and Fig.11 In some embodiments, a plurality of protrusions 12113 are provided, and the plurality of protrusions 12113 are arranged at intervals.

[0137] The number of protrusions 12113 includes but is not limited to one, two, three, etc. For example, Fig.11As shown, there are three protrusions 12113 , namely a first protrusion 12113 a , a second protrusion 12113 b and a third protrusion 12113 c , and three cavities 1213 are formed between the three protrusions 12113 and the fixing member 122 .

[0138] In this embodiment, a plurality of protrusions 12113 are arranged at intervals, and the cross-sectional rigidity of the main body 1211 is enhanced by using smaller material intervals.

[0139] In some embodiments, the main body 1211 further includes a connecting portion 12114 , and two adjacent protrusions 12113 are connected by the connecting portion 12114 , and the connecting portion 12114 is in contact with the fixing member 122 .

[0140] The connection portion 12114 contacts the fixing member 122 , that is, no cavity 1213 is formed between the connection portion 12114 and the fixing member 122 .

[0141] The connecting portion 12114 contacts the fixing member 122 , wherein the fixing member 122 can be crimped to the edge portion 1212 and the connecting portion 12114 at the same time.

[0142] The connection portion 12114 contacts the fixing member 122 , which can improve the fixing effect of the fixing member 122 on the main body 1211 , thereby improving the fixing effect of the fixing member 122 on the metal sheet 121 and reducing the risk of displacement of the metal sheet 121 during normal use of the battery cell 10 .

[0143] Reference Fig.10 and Fig.11 In some embodiments, the main body 1211 includes a first protrusion 12113a, a second protrusion 12113b and a third protrusion 12113c, and the first protrusion 12113a, the second protrusion 12113b and the third protrusion 12113c are arranged in sequence along the first direction X, and along the second direction Y, the size of the second protrusion 12113b is larger than the size of the first protrusion 12113a, and the size of the second protrusion 12113b is larger than the size of the third protrusion 12113c, and the first direction, the second direction Y and the axial direction P of the exhaust hole 1121 are perpendicular to each other.

[0144] The shapes of the three protrusions 12113 can be the same or different and can be arranged as needed.

[0145] The sizes of the first protrusion 12113a and the third protrusion 12113c may be the same or different.

[0146] In this embodiment, along the second direction Y, the size of the second protrusion 12113b is larger than the size of the first protrusion 12113a, and the size of the second protrusion 12113b is larger than the size of the third protrusion 12113c. In this way, along the second direction Y, the size of the second protrusion 12113b is larger, which can increase the cross-sectional rigidity of the main body 1211 to a greater extent in the second direction Y, and improve the ability of the main body 1211 to resist deformation risks. In this way, along the second direction Y, the first protrusion 12113a and the second protrusion 12113b are smaller, and the size occupies less.

[0147] In the embodiment where the battery cell 10 is rectangular, the first direction X may be the thickness (i.e., width) direction of the battery cell 10, or the length direction of the battery cell 10. If the first direction X is the thickness direction of the battery cell 10, the second direction Y is the length direction of the battery cell 10.

[0148] In some embodiments, the first protrusion 12113a and the third protrusion 12113c are symmetrically arranged with respect to the second protrusion 12113b. That is, the first protrusion 12113a and the third protrusion 12113c have the same shape.

[0149] The symmetry axes of the first protrusion 12113a and the third protrusion 12113c may be parallel to the second direction Y.

[0150] In this embodiment, the first protrusion 12113a and the third protrusion 12113c are symmetrically arranged, and the first protrusion 12113a and the third protrusion 12113c can evenly strengthen the cross-sectional rigidity of the main body 1211 on both sides of the second protrusion 12113b.

[0151] In some embodiments, along the axial direction P of the exhaust hole 1121 , the projection of the first protrusion 12113 a is fan-shaped.

[0152] The projection of the first protrusion 12113a is fan-shaped, and such a first protrusion 12113a can provide better stress distribution.

[0153] In some embodiments, along the axial direction P of the exhaust hole 1121 , the projection of the third protrusion 12113 c is fan-shaped.

[0154] The projection of the second protrusion 12113b is fan-shaped, and such a second protrusion 12113b can provide better stress distribution.

[0155] In some embodiments, along the axial direction P of the exhaust hole 1121, the projection of the metal sheet 121 is circular, the projection of the first protrusion 12113a is fan-shaped, and the projection of the third protrusion 12113c is fan-shaped. When the projection of the metal sheet 121 is circular, the fan-shaped first protrusion 12113a and the fan-shaped third protrusion 12113c can improve space utilization.

[0156] In some embodiments, the metal sheet 121 is an aluminum sheet.

[0157] Reference Figure 7 In some embodiments, the wall portion of the housing 11 provided with the exhaust hole 1121 has a fourth surface 1216 facing the exhaust valve 12, the fourth surface 1216 is provided with a limiting groove 1215, the limiting groove 1215 is arranged around the exhaust hole 1121, the fourth surface 1216 includes a first area 1216b located inside the groove and a second area 1216a located outside the groove, and the second area 1216a protrudes from the first area 1216b. The first area 1216b is lower than the second area 1216a, which can reduce the risk of interference between the fourth surface 1216 and the main body 1211 of the metal sheet 121.

[0158] In some embodiments, along the axial direction P of the exhaust hole 1121 , the projection of the edge portion 1212 covers the limiting groove 1215 .

[0159] Reference Figure 5 , Figure 6 and Fig. 9 In some embodiments, the battery cell 10 further includes a pressure ring 13 , which is fixed to the housing 11 . The pressure ring 13 is crimped to the fixing member 122 , so that the exhaust valve 12 is fixed to the wall of the housing 11 .

[0160] The pressure ring 13 is a component that is crimped onto the fixing part 122 to fix the exhaust valve 12 to the housing 11. Crimping means that the pressure ring 13 presses the fixing part 122, thereby indirectly pressing the metal sheet 121, and there is no physical connection structure between the pressure ring 13 and the fixing part 122. If the fixing part 122 is deformed, the pressure of the pressure ring 13 on the fixing part 122 will be weakened or fail. At this time, the fixing part 122 will be out of the state of being pressed by the pressure ring 13, causing the metal sheet 121 to release the exhaust hole 1121. Among them, the pressure ring 13 is an annular structure. When observed along the thickness direction Z of the end cover 112, the pressure ring 13 is crimped onto the edge of the fixing part 122, and the inner ring of the pressure ring 13 exposes the middle part of the exhaust valve 12.

[0161] The pressure ring 13 is fixed to the end cover 112 , and the pressure ring 13 and the wall of the housing 11 can be welded.

[0162] In this embodiment, the pressure ring 13 is crimped onto the fixing piece 122, thereby fixing the exhaust valve 12 to the wall of the outer shell 11. The pressure ring 13 can stabilize the position of the exhaust valve 12, thereby reducing the risk of displacement of the exhaust valve 12 when the battery cell 10 is not out of control, resulting in failure of the seal between the exhaust valve 12 and the end cover 112.

[0163] Fig.12 Schematic diagram of the structure of the fixing member 122 according to some embodiments of the present application.

[0164] Reference Fig.12 , and combined with reference Figure 6 and Fig. 9 In some embodiments, the fixing member 122 includes a first portion 1221 and a second portion 1222 connected in sequence, the second portion 1222 radially exceeds the edge of the first portion 1221 to form a step between the first portion 1221 and the second portion 1222, the pressing ring 13 is crimped to the portion of the second portion 1222 that exceeds the first portion 1221, and the second portion 1222 is disposed between the first portion 1221 and the metal sheet 121. In this way, in the thickness direction Z of the end cover 112, the pressing ring 13 and the fixing member 122 can share a portion of the size, thereby reducing space occupation.

[0165] Reference Fig.12 , and combined with reference Figure 6 and Fig. 9 In some embodiments, the fixing member 122 has a third surface 1223 of the wall portion facing the outer shell 11 and provided with the exhaust hole 1121. The third surface 1223 forms a groove, and a part of the metal sheet 121 is accommodated in the groove. The groove can improve the limiting effect of the fixing member 122 on the metal sheet 121 and reduce the risk of displacement of the metal sheet 121 during normal use of the battery cell 10.

[0166] Reference Fig. 9 and Fig.11 In some embodiments, the fixing member 122 has a fifth surface 1224 facing the metal sheet 121, and along the axial direction P of the exhaust hole 1121, the size H of the metal sheet 121 is smaller than the distance L between the fifth surface 1224 and the first area 1216b. The size of the metal sheet 121 refers to the size at the maximum position of the metal sheet 121 along the axial direction P of the exhaust hole 1121, which can also be understood as the maximum thickness of the metal sheet 121. The size of the metal sheet 121 is smaller than the distance between the fifth surface 1224 and the first area 1216b, which can reduce the risk of interference between the exhaust valve 12 and the first area 1216b.

[0167] In some embodiments, the battery cell 10 further includes a pressure relief mechanism 19 , which is disposed on a wall of the housing 11 .

[0168] The pressure relief mechanism 19 is used to release the pressure inside the battery cell 10 when the pressure inside the battery cell 10 reaches a threshold value. The threshold value varies according to different design requirements. The threshold value may depend on one or more materials of the positive electrode sheet, negative electrode sheet, electrolyte and isolation membrane in the battery cell 10. The pressure relief mechanism 19 can take the form of explosion-proof valve, explosion-proof disk, pressure relief valve, etc., and can specifically adopt a pressure-sensitive element or structure, that is, when the internal pressure of the battery cell 10 reaches a predetermined threshold value, the pressure relief mechanism 19 performs an action or the weak structure provided in the pressure relief mechanism 19 is destroyed, thereby forming an opening or channel for internal pressure relief.

[0169] The pressure relief mechanism 19 may be disposed on the end cover 112, or the pressure relief mechanism 19 may be disposed on the housing 111. Figure 3 As shown, the exhaust hole 1121 is provided on the end cover 112 , and the pressure relief mechanism 19 is provided on the bottom wall of the shell 111 . The bottom wall of the shell 111 is the wall portion of the shell 111 opposite to the end cover 112 .

[0170] The embodiment of the present application provides a battery 100 , and the battery 100 includes the battery cell 10 provided above.

[0171] An embodiment of the present application provides an electric device, which includes the above-mentioned battery cell 10 or the above-mentioned battery 100. The battery cell 10 or the battery 100 is used to supply power to the electric device.

[0172] Reference Figures 2 to 8 ,as well as Fig.12The embodiment of the present application provides a battery cell 10, and the battery cell 10 includes a shell 11, an electrode assembly 17, an electrode terminal 18, a pressure ring 13, an exhaust valve 12, a seal 14, an insulating member 15, and a pressure relief mechanism 19. The electrode assembly 17 is accommodated in the shell 11. The shell 11 includes a shell 111 and an end cover 112, one end of the shell 111 is open, and the end cover 112 covers the opening. The insulating member 15 is arranged on the inner surface of the end cover 112, and the insulating member 15 is lower plastic. The electrode terminal 18 is arranged on the end cover 112, and the electrode terminal 18 is electrically connected to the pole ear of the electrode assembly 17. The outer surface of the end cover 112 is provided with a sink 1122, and the bottom of the sink 1122 is provided with an exhaust hole 1121. The exhaust valve 12 is accommodated in the sink 1122. The exhaust valve 12 includes a metal sheet 121 and a fixing member 122 connected to each other. The metal sheet 121 blocks the exhaust hole 1121. The fixing member 122 is crimped to the metal sheet 121. The fixing member 122 is configured to deform in response to an increase in temperature so that the metal sheet 121 is out of the state of blocking the exhaust hole 1121. The sealing member 14 is a sealing ring. The sealing member 14 is arranged between the metal sheet 121 and the end cover 112 and is arranged around the exhaust hole 1121. The sealing member 14 is used to seal the gap between the metal sheet 121 and the end cover 112. The pressure ring 13 is welded to the end cover 112, and the pressure ring 13 is accommodated in the sink 1122 and crimped to the fixing member 122. The fixing member 122 includes a first portion 1221 and a second portion 1222 connected in sequence, the second portion 1222 radially exceeds the edge of the first portion 1221 so as to form a step between the first portion 1221 and the second portion 1222, the pressure ring 13 is crimped to the portion of the second portion 1222 that exceeds the first portion 1221, and the second portion 1222 is arranged between the first portion 1221 and the metal sheet 121. The fixing member 122 has a third surface 1223 facing the end cover 112, the third surface 1223 forms a groove, and a part of the metal sheet 121 is accommodated in the groove. The metal sheet 121 includes a main body 1211 and an edge portion 1212 connected to each other, the edge portion 1212 is arranged around the main body 1211, the edge portion 1212 is crimped to the sealing member 14, and along the axial direction P of the exhaust hole 1121, at least a part of the main body 1211 protrudes from the edge portion 1212 in a direction away from the fixing member 122. The main body 1211 has a first surface 12111 facing the fixing member 122, a cavity 1213 is formed between the first surface 12111 and the fixing member 122, and the distance between the first surface 12111 and the fixing member 122 gradually decreases from the center of the main body 1211 to the edge 1212. The main body 1211 has a second surface 12112 facing away from the fixing member 122, and the distance between the second surface 12112 and the fixing member 122 gradually decreases from the center of the main body 1211 to the edge 1212. The metal sheet 121 is a body of revolution, and the projection of the metal sheet 121 along the axial direction P of the exhaust hole 1121 is circular. The metal sheet 121 is formed by stamping.The end cover 112 has a fourth surface 1216 facing the exhaust valve 12, and the fourth surface 1216 is provided with a limiting groove 1215, and the limiting groove 1215 is arranged around the exhaust hole 1121. The fourth surface 1216 includes a first area 1216b located on the inner side of the groove and a second area 1216a located on the outer side of the groove, and the second area 1216a protrudes from the first area 1216b. Along the axial direction P of the exhaust hole 1121, the projection of the edge portion 1212 covers the limiting groove 1215, and the projection of the main body 1211 does not overlap with the projection of the limiting groove 1215. The fixing member 122 has a fifth surface 1224 facing the metal sheet 121, and along the axial direction P of the exhaust hole 1121, the size H of the metal sheet 121 is smaller than the distance L between the fifth surface 1224 and the first area 1216b.

[0173] Reference Figures 3 to 5 , Figures 9 to 12The embodiment of the present application provides a battery cell 10, and the battery cell 10 includes a shell 11, an electrode assembly 17, an electrode terminal 18, a pressure ring 13, an exhaust valve 12, a seal 14, an insulating member 15, and a pressure relief mechanism 19. The electrode assembly 17 is accommodated in the shell 11. The shell 11 includes a shell 111 and an end cover 112, one end of the shell 111 is open, and the end cover 112 covers the opening. The insulating member 15 is arranged on the inner surface of the end cover 112, and the insulating member 15 is lower plastic. The electrode terminal 18 is arranged on the end cover 112, and the electrode terminal 18 is electrically connected to the pole ear of the electrode assembly 17. The outer surface of the end cover 112 is provided with a sink 1122, and the bottom of the sink 1122 is provided with an exhaust hole 1121. The exhaust valve 12 is accommodated in the sink 1122. The exhaust valve 12 includes a metal sheet 121 and a fixing member 122 connected to each other. The metal sheet 121 blocks the exhaust hole 1121. The fixing member 122 is crimped to the metal sheet 121. The fixing member 122 is configured to deform in response to an increase in temperature so that the metal sheet 121 is out of the state of blocking the exhaust hole 1121. The sealing member 14 is a sealing ring. The sealing member 14 is arranged between the metal sheet 121 and the end cover 112 and is arranged around the exhaust hole 1121. The sealing member 14 is used to seal the gap between the metal sheet 121 and the end cover 112. The pressure ring 13 is welded to the end cover 112, and the pressure ring 13 is accommodated in the sink 1122 and crimped to the fixing member 122. The fixing member 122 includes a first portion 1221 and a second portion 1222 connected in sequence, the second portion 1222 radially exceeds the edge of the first portion 1221 so as to form a step between the first portion 1221 and the second portion 1222, the pressure ring 13 is crimped to the portion of the second portion 1222 that exceeds the first portion 1221, and the second portion 1222 is arranged between the first portion 1221 and the metal sheet 121. The fixing member 122 has a third surface 1223 facing the end cover 112, the third surface 1223 forms a groove, and a part of the metal sheet 121 is accommodated in the groove. The metal sheet 121 includes a main body 1211 and an edge portion 1212 connected to each other, the edge portion 1212 is arranged around the main body 1211, the edge portion 1212 is crimped to the sealing member 14, and along the axial direction P of the exhaust hole 1121, at least a part of the main body 1211 protrudes from the edge portion 1212 in a direction away from the fixing member 122. The main body 1211 includes a protrusion 12113 and a connecting portion 12114. Three protrusions 12113 are provided. Each protrusion 12113 protrudes from the edge portion 1212 in a direction away from the fixing member 122. A cavity 1213 is formed between each protrusion 12113 and the fixing member 122. Two adjacent protrusions 12113 are connected by the connecting portion 12114, and the connecting portion 12114 is in contact with the fixing member 122.The three protrusions are respectively the first protrusion 12113a, the second protrusion 12113b and the third protrusion 12113c. The first protrusion 12113a, the second protrusion 12113b and the third protrusion 12113c are arranged in sequence along the first direction X. Along the second direction Y, the size of the second protrusion 12113b is larger than the size of the first protrusion 12113a, and the size of the second protrusion 12113b is larger than the size of the third protrusion 12113c. The first direction, the second direction Y and the axial direction P of the exhaust hole 1121 are perpendicular to each other. The first protrusion 12113a and the third protrusion 12113c are symmetrically arranged about the second protrusion 12113b. The first protrusion 12113a and the third protrusion 12113c have the same shape. Along the axial direction P of the exhaust hole 1121, the projection of the first protrusion 12113a is fan-shaped, and the projection of the second protrusion 12113b is fan-shaped. The center of the fan-shaped circle is the same as the center of the projection of the metal sheet 121. The metal sheet 121 is formed by stamping. The end cover 112 has a fourth surface 1216 facing the exhaust valve 12, and the fourth surface 1216 is provided with a limiting groove 1215, and the limiting groove 1215 is arranged around the exhaust hole 1121. The fourth surface 1216 includes a first area 1216b located on the inner side of the groove and a second area 1216a located on the outer side of the groove, and the second area 1216a protrudes from the first area 1216b. Along the axial direction P of the exhaust hole 1121, the projection of the edge portion 1212 covers the limiting groove 1215, and the projection of the main body 1211 does not overlap with the projection of the limiting groove 1215. The fixing member 122 has a fifth surface 1224 facing the metal sheet 121, and along the axial direction P of the exhaust hole 1121, the size H of the metal sheet 121 is smaller than the distance L between the fifth surface 1224 and the first area 1216b.

[0174] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0175] The above embodiments are only used to illustrate the technical solution of the present application and are not used to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery cell, characterized in that: include: A shell, wherein a wall of the shell is provided with an exhaust hole; An exhaust valve, comprising a metal sheet and a fixing member connected to each other, wherein the metal sheet blocks the exhaust hole, and the fixing member is configured to deform in response to an increase in temperature so that the metal sheet is out of a state of blocking the exhaust hole; A sealing member, disposed between the metal sheet and the wall of the housing and surrounding the exhaust hole, the sealing member being used to seal the gap between the metal sheet and the wall of the housing; The metal sheet includes a main body and an edge portion connected to each other. The edge portion is arranged around the main body and is crimped to the seal. Along the axial direction of the exhaust hole, at least a part of the main body protrudes from the edge portion.

2. The battery cell according to claim 1, characterized in that: At least a portion of the main body protrudes from the edge portion in a direction away from the fixing member.

3. The battery cell according to claim 1, characterized in that: A cavity is formed between at least a portion of the main body and the fixing member.

4. The battery cell according to claim 3, characterized in that: The main body has a first surface facing the fixing member, the cavity is formed between the first surface and the fixing member, and the distance between the first surface and the fixing member gradually decreases from the center of the main body to the edge.

5. The battery cell according to any one of claims 1 to 4, characterized in that: The main body has a second surface facing away from the fixing element, and the distance between the second surface and the fixing element gradually decreases from the center of the main body to the edge.

6. The battery cell according to claim 3, characterized in that: The main body portion includes at least one protruding portion, the protruding portion protrudes from the edge portion in a direction away from the fixing member, and the cavity is formed between the protruding portion and the fixing member.

7. The battery cell according to claim 6, characterized in that: There are a plurality of protrusions, and the plurality of protrusions are arranged at intervals.

8. The battery cell according to claim 7, characterized in that: The main body also includes a connecting portion, two adjacent protrusions are connected by the connecting portion, and the connecting portion is in contact with the fixing member.

9. The battery cell according to claim 7 or 8, characterized in that: The main body portion includes a first protrusion, a second protrusion and a third protrusion, the first protrusion, the second protrusion and the third protrusion are arranged in sequence along the first direction, along the second direction, the size of the second protrusion is larger than the size of the first protrusion, the size of the second protrusion is larger than the size of the third protrusion, and the first direction, the second direction and the axial direction of the exhaust hole are perpendicular to each other.

10. The battery cell according to claim 9, characterized in that: The first protrusion and the third protrusion are symmetrically arranged with respect to the second protrusion.

11. The battery cell according to claim 9, characterized in that: Along the axial direction of the exhaust hole, the projection of the first protrusion is fan-shaped, and / or the projection of the third protrusion is fan-shaped.

12. The battery cell according to any one of claims 1 to 4, characterized in that: The metal sheet is an aluminum sheet.

13. The battery cell according to any one of claims 1 to 4, characterized in that: The battery cell further comprises: The pressure relief mechanism is arranged on the wall of the shell.

14. A battery, characterized in that: A battery cell comprising the battery cell according to any one of claims 1 to 13.

15. An electrical equipment, characterized in that: The invention comprises the battery cell according to any one of claims 1 to 13 or the battery according to claim 14, wherein the battery cell or the battery is used to supply power to the electrical device.

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