Battery monomer, battery device and electric equipment

Abstract

The utility model discloses a single battery, a battery device and electric equipment, the single battery comprises a shell and a pressure relief mechanism, the pressure relief mechanism comprises a connecting piece and a pressure relief body, the connecting piece is connected with the pressure relief body and is used for being connected with the shell, the pressure relief body is provided with a first side surface and a second side surface which are opposite in a first direction, and the first side surface and the second side surface are opposite in the first direction. The sealing flange is formed on the second side face, and the connecting piece is suitable for abutting against the first side face so that the sealing flange can block the gap between the shell and the pressure relief body. Therefore, the sealing flange is arranged on the second side face, facing the shell, of the pressure relief body, the connecting piece abuts against the pressure relief body on the first side face and is connected with the shell at the same time, sealing between the shell and the pressure relief mechanism can be achieved, integration of the sealing structure and the pressure relief body can be achieved, the sealing structure does not need to be independently arranged, the number of parts is reduced, and cost is reduced. The assembly difficulty can be reduced, the battery monomer structure is simplified, and the battery monomer cost is reduced.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery cell, battery device, and electrical equipment. Background Technology

[0002] In related technologies, pressure relief structures need to be incorporated into individual battery cells to promptly release pressure when abnormal pressure occurs inside the cell, thereby improving safety and reliability. However, existing pressure relief structures face challenges in sealing with the outer casing, resulting in high sealing costs and complex assembly.

[0003] Application content

[0004] This application aims to address at least one of the technical problems existing in the prior art. To this end, one objective of this application is to provide a battery cell, battery device, and electrical appliance, wherein the battery cell has a simpler structure and lower cost.

[0005] In a first aspect, this application provides a battery cell, including: a housing and a pressure relief mechanism. The pressure relief mechanism includes: a connector and a pressure relief body. The connector is connected to the pressure relief body and is used to connect to the housing. The pressure relief body has a first side and a second side opposite to each other in a first direction. A sealing flange is formed on the second side. The connector is adapted to press against the first side so that the sealing flange seals the gap between the housing and the pressure relief body.

[0006] According to the embodiments of this application, the battery cell can achieve a seal between the housing and the pressure relief mechanism by providing a sealing flange on the second side of the pressure relief body facing the housing, and connecting the connector to the housing while pressing against the pressure relief body on the first side. This can achieve the integration of the sealing structure and the pressure relief body, eliminating the need for a separate sealing structure, reducing the number of parts, reducing assembly difficulty, simplifying the battery cell structure, and reducing the cost of the battery cell.

[0007] According to some embodiments of this application, the second side also has a limiting flange, the outer shell has a pressure relief hole, the pressure relief mechanism covers the pressure relief hole, the limiting flange is adapted to push against the inner wall of the pressure relief hole in the second direction, the first direction and the second direction have an angle, and the sealing flange and the limiting flange are spaced apart in the second direction.

[0008] In the above technical solution, both the limiting flange and the sealing flange on the second side protrude from the second side. At least a portion of the limiting flange can extend into the pressure relief hole and is adapted to push against the inner wall of the pressure relief hole to achieve the pre-positioning of the pressure relief body on the pressure relief hole, which facilitates the subsequent assembly of the connecting parts and the housing. The sealing flange is located outside the limiting flange in the second direction and can push against the surface of the housing to achieve the sealing between the housing and the pressure relief mechanism on the periphery of the pressure relief hole, thereby improving the sealing effect.

[0009] According to some embodiments of this application, the sealing flange is constructed of a flexible material.

[0010] In the above technical solution, the sealing flange can be made of flexible materials such as rubber, polyurethane, or polytetrafluoroethylene. When the sealing flange is pressed against the outer shell by the connector, the deformation of the sealing flange can effectively seal the gap between the pressure relief body and the outer shell. When the pressure relief body undergoes slight deformation under pressure, the elastic deformation of the sealing flange ensures the sealing effect, thereby further improving the sealing reliability and stability between the pressure relief mechanism and the outer shell.

[0011] According to some embodiments of this application, the peripheral edge of the connector is provided with a first connecting portion, and the peripheral edge of the pressure relief body has a second connecting portion that mates with the first connecting portion.

[0012] In the above technical solution, the first connecting part and the second connecting part can cooperate to realize the assembly of the connecting part and the pressure relief body. In the process of assembling the pressure relief mechanism to the shell, the pressure relief body and the connecting part can be assembled to the shell at the same time. Through the pre-positioning effect of the limiting flange and the pressure relief hole, the initial positioning of the connecting part on the assembly position of the shell can be realized. This can not only reduce the assembly difficulty and improve the assembly efficiency, but also improve the assembly accuracy of the pressure relief mechanism on the shell.

[0013] According to some embodiments of this application, the first connecting part and the second connecting part are engaged, and a step is formed on the pressure relief body. The step is located on the peripheral edge of the pressure relief body and is used to avoid the connecting parts.

[0014] In the above technical solution, the pressure relief body may include a first side surface, a second side surface, and a peripheral surface surrounding the first side surface and the second side surface, which are arranged opposite to each other in the thickness direction. The peripheral surface is constructed as a stepped portion (i.e., the stepped portion is located at the peripheral edge of the pressure relief body), and the stepped portion can be generally constructed as an arc-shaped surface. The stepped portion may also include one or more stepped surfaces located between the first side surface and the second side surface and having a height difference with the first side surface. When the first connecting portion and the second connecting portion are connected, the stepped portion can be used to avoid the first connecting portion, reduce the difficulty of the first connecting portion and the second connecting portion, and increase the contact area between the connecting member and the pressure relief body, thereby improving the connection stability and reliability between the pressure relief body and the connecting member.

[0015] According to some embodiments of this application, the pressure relief body includes a substrate and a thickened portion and / or a thinned portion formed on the substrate, wherein the dimension L2 of the thickened portion in a first direction is greater than the dimension L1 of the substrate portion in the first direction, and the dimension L3 of the thinned portion in the first direction is smaller than the dimension L1 of the substrate portion in the first direction.

[0016] In the above technical solution, this application uses a hot pressing process to adjust the die and punch to process a thinned part and / or a thickened part on the pressure relief body. The thinned part is designed to balance water permeability and air permeability, while the thickened part is designed to improve the pressure resistance consistency of the pressure relief body.

[0017] According to some embodiments of this application, a weak structure is formed on the thickened portion and / or thinned portion to make the pressure relief body suitable for venting when the pressure inside the housing exceeds a pressure threshold.

[0018] In the above technical solutions, in the first embodiment, the thickness of the base material of the pressure relief body is less than the thickness of the thickened part, and the total thickness is the maximum thickness of the body. The pressure relief body only increases in thickness in at least a part of the area, which has a smaller impact on space occupation and can take into account both water permeability and air permeability. In the second embodiment, the thickness of the base material of the pressure relief body is greater than the thickness of the thinned part. For embodiments where the pressure relief body itself is thicker, although a thicker pressure relief body can improve pressure resistance, it will reduce the water permeability and air permeability of the pressure relief body. However, this application further provides a thinned part, which can take into account both water permeability and air permeability.

[0019] According to some embodiments of this application, the weak structure is constructed as a notch.

[0020] In the above technical solution, not only can the directional pressure relief of the pressure relief mechanism be achieved by setting the grooves, thereby improving the protective effect of the pressure relief mechanism, but the processing difficulty of the weak structure with grooves is low, the manufacturing cost is low, and the structural consistency of the pressure relief body can be improved.

[0021] According to some embodiments of this application, a groove is formed on a thickened portion, and the dimension L2 of the thickened portion in the first direction and the depth L4 of the groove satisfy the condition: 0.6L2≤L4≤0.9L2; or a groove is formed on a thinned portion, and the dimension L3 of the thinned portion in the first direction and the depth L4 of the groove satisfy the condition: 0.6L3≤L4≤0.9L3.

[0022] In the above technical solution, in the embodiment where the groove is formed on the thickened part, the groove depth satisfies 0.6L2≤L4≤0.9L2, and in the embodiment where the groove is formed on the thinned part, the groove depth satisfies 0.6L3≤L4≤0.9L3, so that the groove depth does not exceed 0.9 times the thickness of the thinned or thickened part, and is not less than 0.4 times the thickness of the thinned or thickened part, so that the groove depth is more reasonable, avoiding excessive groove depth, which would lead to a decrease in the pressure resistance consistency of the pressure relief mechanism, and also avoiding excessive groove depth, which would lead to the pressure relief mechanism being unable to relieve pressure in time, thereby improving the reliability and stability of the pressure relief mechanism.

[0023] According to some embodiments of this application, thickened portions and / or thinned portions are formed on a first side surface and / or a second side surface.

[0024] According to some embodiments of this application, 0.5mm ≤ L1 ≤ 3mm.

[0025] The above technical solution allows for a more reasonable thickness of the pressure relief body, avoiding excessive thickness to balance the space occupied by the pressure relief body, and avoiding excessive thickness to ensure consistent pressure resistance of the pressure relief body.

[0026] According to some embodiments of this application, 1.2L1≤L2≤2L1.

[0027] In the above technical solution, the thickness of the thickened part does not exceed twice the thickness of the base material, which makes the overall thickness of the pressure relief body more reasonable, so as to take into account the space occupation. The thickness of the thickened part is not less than 1.2 times the thickness of the base material, which makes the thickness of the thickened part more reasonable and can make the thickened part better improve the pressure resistance consistency of the pressure relief body.

[0028] According to some embodiments of this application, 0.4L1≤L3≤0.8L1.

[0029] In the above technical solution, the thickness of the thinned part is not less than 0.4 times the thickness of the base material, which can avoid the thinned part being too thin, so as to take into account the pressure resistance consistency of the pressure relief body. The thickness of the thinned part is not greater than 0.8 times the thickness of the base material, and the thickness dimension of the thinned part is more reasonable, which can make the thinned part better improve the air permeability of the pressure relief body.

[0030] Secondly, this application provides a battery device, including: the battery cell in the above embodiments.

[0031] Thirdly, this application provides an electrical device, including the battery device described in the above embodiments.

[0032] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0033] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0034] Figure 1 This is a schematic diagram of an electrical device according to an embodiment of this application;

[0035] Figure 2 This is a schematic diagram of a battery device according to an embodiment of this application;

[0036] Figure 3 This is a schematic diagram of a battery cell according to an embodiment of this application;

[0037] Figure 4 This is a schematic diagram of the cooperation between the pressure relief mechanism and the end cap according to the first embodiment of this application;

[0038] Figure 5 This is a top view of the pressure relief mechanism and end cap according to the first embodiment of this application;

[0039] Figure 6 yes Figure 5 Schematic cross-sectional view of midline AA;

[0040] Figure 7 yes Figure 6 The center circle shows a magnified view of a portion of area B.

[0041] Figure 8 This is a schematic diagram of the cooperation between the pressure relief mechanism and the end cap according to the second embodiment of this application;

[0042] Figure 9 This is a top view of the pressure relief mechanism and end cap according to the second embodiment of this application;

[0043] Figure 10 yes Figure 9 Cross-sectional view of the center line CC;

[0044] Figure 11 yes Figure 10 The center circle shows a magnified view of a portion of area D;

[0045] Figure 12 This is a schematic diagram of the pressure relief mechanism according to an embodiment of this application from one angle;

[0046] Figure 13 yes Figure 12 Cross-sectional view of the centerline EE;

[0047] Figure 14 This is a schematic diagram of the pressure relief mechanism according to an embodiment of this application from another angle;

[0048] Figure 15 This is a schematic diagram of the base material portion and the thickened portion according to an embodiment of this application;

[0049] Figure 16 This is a schematic diagram of the substrate portion and the thinned portion according to an embodiment of this application.

[0050] Figure label:

[0051] 100 cells per battery

[0052] 10 outer casing, 11 outer casing, 12 end cap, 13 pressure relief hole.

[0053] Pressure relief mechanism 20, connector 21, first connecting part 211, pressure relief body 22, first side 221, second side 222, sealing flange 223, limiting flange 224, second connecting part 225, stepped part 226, weak structure 227.

[0054] Substrate 22a, thickened portion 22b, thinned portion 22c

[0055] Electrode assembly 30,

[0056] Battery unit 200, electrical equipment 300, controller 400, motor 500, enclosure 600.

[0057] First direction X, second direction Y. Detailed Implementation

[0058] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0059] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0060] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0061] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0062] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0063] In the embodiments of this application, the same reference numerals denote 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 this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0064] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0065] In the description of this application, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or the first and second features being in contact through another feature between them.

[0066] In the description of this application, the terms "above," "over," and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicate that the first feature is at a higher horizontal level than the second feature.

[0067] In this application, "multiple" means two or more (including two).

[0068] A single battery cell can be a rechargeable battery. A rechargeable battery is a battery cell that can be recharged after it has been discharged, allowing the active materials to be activated and the cell to continue to be used.

[0069] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0070] The battery device mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells, which may form a battery array, and the multiple battery cells may be connected in series, parallel, or in a mixed configuration via a busbar.

[0071] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells, such as forming a battery array.

[0072] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form an independent module. As another example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0073] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cell assemblies housed within the housing.

[0074] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0075] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0076] As an example, the enclosure may include a first enclosure and a second enclosure. The first enclosure and the second enclosure are fastened together to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first enclosure may be a top cover or a bottom plate.

[0077] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0078] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0079] The technical solutions described in the embodiments of this application are applicable to battery devices and electrical equipment using battery devices.

[0080] Electrical equipment can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This application does not impose any special limitations on the above-mentioned electrical equipment.

[0081] For ease of explanation, the following embodiments use a vehicle as an example of electrical equipment.

[0082] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle provided in some embodiments of this application. A battery device 200 is installed inside the vehicle, and the battery device 200 may be located at the bottom, front, or rear of the vehicle. The battery device 200 can be used to power the vehicle; for example, the battery device 200 can serve as the vehicle's operating power source.

[0083] The vehicle may also include a controller 400 and a motor 500. The controller 400 controls the battery device 200 to supply power to the motor 500, which serves as a load, for example, for the power needs of the vehicle during starting, navigation and driving.

[0084] In some embodiments of this application, the battery device 200 can not only serve as the operating power source for the vehicle, but also as the driving power source for the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0085] Please refer to Figure 2 , Figure 2 This is an exploded view of a battery device 200 provided in some embodiments of this application. The battery device 200 includes a housing 600 for housing individual battery cells 100.

[0086] The housing 600 is a component that houses the individual battery cells 100. The housing 600 provides placement space for multiple battery cells 100 and can adopt various structures. In some embodiments, the housing 600 may include a tray and a cover, which overlap to define a placement space for accommodating the battery cells 100. The tray and cover can be of various shapes, such as cuboids, cylinders, etc. The tray can be a hollow structure open on one side, and the cover can also be a hollow structure open on one side, with the open side of the cover overlapping the open side of the tray, thus forming a housing 600 with placement space. Alternatively, the tray can be a hollow structure open on one side, and the cover can be a plate-like structure, overlapping the open side of the tray, thus forming a housing 600 with placement space. As an example, the battery cell 100 can be a cylindrical battery cell, a prismatic battery cell, or a battery cell of other shapes (such as a pouch battery cell); this application does not impose any particular limitations.

[0087] In the battery device 200, there can be one or more battery cells 100. If there are multiple battery cells 100, they can be connected in series, parallel, or in a mixed manner. A mixed connection means that multiple battery cells 100 are connected in both series and parallel. Alternatively, multiple battery cells 100 can be first connected in series, parallel, or in a mixed manner to form a battery module, and then multiple battery modules can be connected in series, parallel, or in a mixed manner to form a whole, which is then housed within the housing 600. Another option is that all battery cells 100 can be directly connected in series, parallel, or in a mixed manner, and then the whole consisting of all battery cells 100 is housed within the housing 600.

[0088] The battery cell 100 serves as the smallest energy unit of the battery device 200. The battery device 200 includes multiple battery cells 100. Each battery cell 100 includes a housing 10, an end cap 12, and an electrode assembly 30 disposed within the housing 10.

[0089] like Figure 3 As shown, in some embodiments, the battery cell 100 may include: a housing 10, the housing 10 including a shell 11 and an end cap 12, and an electrode assembly 30 disposed therein, that is, the shell 11 is used to define an accommodating space with an installation opening, and the electrode assembly 30 is disposed therein.

[0090] For example, the housing 11 may include a base plate and a side plate. The side plate surrounds the periphery of the base plate and defines an accommodating space with a mounting opening. The electrode assembly 30 and other functional components may be disposed in the accommodating space. The end cap 12 covers the mounting opening of the housing 11 to isolate the internal environment of the battery cell 100 from the external environment. The shape of the end cap 12 is adapted to the shape of the housing 11. The end cap 12 may be supported by a material with a certain hardness and strength (such as aluminum alloy or carbon fiber plate). The end cap 12 can effectively protect the safety and reliability of the internal components of the housing 11 during compression and collision.

[0091] In some embodiments, the end cap 12 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose any special limitations on this. In some embodiments, an insulating element can also be provided on the inner side of the end cap 12. The insulating element can be used to isolate the electrical connection components inside the housing 10 from the end cap 12 to reduce the risk of short circuit. For example, the insulating element can be plastic, rubber, etc., and an insulating sheet can also be provided between the electrode assembly 30 and the housing 10 to achieve insulation protection.

[0092] The outer casing 10 is a component used to cooperate with the end cap 12 to form the internal environment of the battery cell 100, wherein the formed internal environment can accommodate the electrode assembly 30, electrolyte, and other components. The outer casing 10 and the end cap 12 can be independent components. A mounting opening can be provided on the outer casing 10, and the end cap 12 closes the opening at the mounting opening to form the internal environment of the battery cell 100. The outer casing 10 can be of various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the outer casing 10 can be determined according to the specific shape and size of the electrode assembly 30. The material of the outer casing 10 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose any special limitations on this.

[0093] Electrode terminals may be further disposed on the end cap 12 or the housing 10. The electrode assembly 30 is a component in the battery cell 100 where an electrochemical reaction occurs. The housing 10 may contain one or more electrode assemblies 30. The electrode assembly 30 may include one or more bare cells, each bare cell being formed by winding or stacking a first electrode and a second electrode, and typically a separator is provided between the first electrode and the second electrode.

[0094] Furthermore, a pressure relief mechanism 20 can be provided on the end cap 12 or the housing 11. The pressure relief mechanism 20 is used to relieve pressure when the internal pressure of the housing 10 exceeds the pressure threshold. In order to improve the sealing performance of the battery cell 100, ensure the reliability and stability of the pressure relief mechanism 20, and prevent foreign objects from entering the housing 10 through the area where the pressure relief mechanism 20 is located, a sealing structure needs to be set between the pressure relief mechanism 20 and the housing 10. This results in a large number of parts in the battery cell, a high assembly difficulty for the pressure relief mechanism 20, and an excessively high overall cost for the battery cell 100.

[0095] Based on this, this application proposes a battery cell 100 in which a sealing flange 223 is integrated on the pressure relief body 22 of the pressure relief mechanism 20, which can reduce the number of parts, simplify the structure of the battery cell 100, reduce the assembly difficulty of the pressure relief mechanism 20 on the housing 10, and reduce the cost of the battery cell 100.

[0096] The following is for reference. Figures 1-16 This application describes a battery cell 100, a battery device 200, and an electrical appliance 300 according to embodiments thereof.

[0097] like Figure 3 As shown, this application provides a battery cell 100, including: a housing 10 and a pressure relief mechanism 20. The housing 10 includes a shell 11 and an end cap 12. An electrode assembly 30 is disposed inside the shell 11, and the end cap 12 or the shell 11 is provided with a pressure relief mechanism 20, which is used to open when an abnormal pressure occurs inside the battery cell 100, so as to realize the pressure relief protection of the battery cell 100.

[0098] Among them, see Figures 4-11 As shown, the pressure relief mechanism 20 includes a connector 21 and a pressure relief body 22. The connector 21 is connected to the pressure relief body 22 and is used to connect to the housing 10. The pressure relief body 22 has a first side 221 and a second side 222 facing away from each other in a first direction. A sealing flange 223 is formed on the second side 222. The connector 21 is adapted to press against the first side 221 so that the sealing flange 223 seals the gap between the housing 10 and the pressure relief body 22.

[0099] It is understood that a pressure relief mechanism 20 is provided on the top surface (e.g., end cap 12), bottom surface or side surface of the outer casing 10, the connecting piece 21 is connected to the top surface, bottom surface or side surface of the outer casing 10, and the pressure relief body 22 can be located between the connecting piece 21 and the outer casing 10.

[0100] Combination Figure 7 and Figure 11 As shown, the pressure relief body 22 includes a first side 221 and a second side 222 facing away from each other in a first direction. The first side 221 and the second side 222 correspond to two sides in the thickness direction of the pressure relief body 22. The second side 222 faces the internal space of the housing 10, and the internal pressure of the housing 10 is suitable to act on the second side 222. The first side 221 is away from the internal space of the housing 10, and the connector 21 can at least partially press against the first side 221 and connect to the housing 10 to push the second side 222 against the surface of the housing 10. Then, the sealing flange 223 provided on the second side 222 is pushed against the surface of the housing 10 (such as the top surface, side surface or bottom surface). The deformation of the sealing flange 223 can seal the gap between the housing 11 and the pressure relief body 22, and realize the sealed assembly of the pressure relief mechanism 20 on the housing 10.

[0101] In other words, the sealing flange 223 is located on the side surface of the pressure relief body 22 away from the connector 21. After the connector 21 is connected to the outer shell 10, the sealing flange 223 can be deformed under the action of extrusion force to perform the sealing function.

[0102] According to the embodiments of this application, the battery cell 100 can achieve a seal between the housing 10 and the pressure relief mechanism 20 by providing a sealing flange 223 on the second side 222 of the pressure relief body 22 facing the housing 11, and connecting the connector 21 to the housing 10 while pressing against the pressure relief body 22 on the first side 221. This can achieve the integration of the sealing structure and the pressure relief body 22, eliminating the need for a separate sealing structure, reducing the number of parts, reducing assembly difficulty, simplifying the structure of the battery cell 100, and reducing the cost of the battery cell 100.

[0103] Combination Figure 5 , Figure 6 and Figure 7 or combination Figure 9 , Figure 10 and Figure 11 As shown, according to some embodiments of this application, the second side 222 also has a limiting flange 224, the outer shell 10 has a pressure relief hole 13, the pressure relief mechanism 20 covers the pressure relief hole 13, the limiting flange 224 is adapted to push against the inner wall of the pressure relief hole 13 in the second direction, the first direction and the second direction have an angle, and the sealing flange 223 and the limiting flange 224 are spaced apart in the second direction.

[0104] It should be noted that, see Figure 14 As shown, the first direction is the thickness direction of the pressure relief body 22, and the second direction corresponds to any direction in the plane where the second side 222 is located. For example, if the second plane is perpendicular to the thickness direction of the pressure relief body 22, then the second direction can be any direction in the horizontal plane. The first direction and the second direction have a right angle. If the second plane is inclined relative to the thickness direction of the pressure relief body 22, then the second direction and the first direction have a non-right angle.

[0105] Specifically, the limiting flange 224 and the sealing flange 223 on the second side 222 both protrude from the second side 222. At least a portion of the limiting flange 224 can extend into the pressure relief hole 13 and is adapted to push against the inner wall of the pressure relief hole 13 to achieve the pre-positioning of the pressure relief body 22 on the pressure relief hole 13, which facilitates the subsequent assembly of the connecting piece 21 and the housing 10. The sealing flange 223 is located outside the limiting flange 224 in the second direction, and the sealing flange 223 can push against the surface of the housing 10 to achieve the sealing between the housing 10 and the pressure relief mechanism 20 on the periphery of the pressure relief hole 13, which can improve the sealing effect.

[0106] According to some embodiments of this application, the sealing flange 223 is constructed as a flexible material component.

[0107] Specifically, the sealing flange 223 can be made of flexible materials such as rubber, polyurethane, or polytetrafluoroethylene. When the sealing flange 223 is pressed against the housing 10 by the connector 21, the deformation of the sealing flange 223 effectively seals the gap between the pressure relief body 22 and the housing 10. When the pressure relief body 22 is under pressure and undergoes slight deformation, the elastic deformation of the sealing flange 223 ensures the sealing effect, thereby further improving the sealing reliability and stability between the pressure relief mechanism 20 and the housing 10.

[0108] like Figure 5 , Figure 6 , Figure 9 and Figure 10 As shown, according to some embodiments of this application, the peripheral edge of the connector 21 is provided with a first connecting portion 211, and the peripheral edge of the pressure relief body 22 has a second connecting portion 225 that cooperates with the first connecting portion 211.

[0109] For example, the first connecting part 211 and the second connecting part 225 can be configured as a fixed connection in one or more combinations of snap-fit, plug-in fit, and interference fit.

[0110] Specifically, the first connecting part 211 and the second connecting part 225 can cooperate to assemble the connecting part 21 and the pressure relief body 22. During the process of assembling the pressure relief mechanism 20 to the housing 10, the pressure relief body 22 and the connecting part 21 can be assembled to the housing 10 at the same time. Through the pre-positioning effect of the limiting flange 224 and the pressure relief hole 13, the connecting part 21 can be initially positioned in the assembly position of the housing 10. This not only reduces the assembly difficulty and improves the assembly efficiency, but also improves the assembly accuracy of the pressure relief mechanism 20 on the housing 10.

[0111] Combination Figure 4 and Figure 8 As shown, according to some embodiments of this application, the first connecting part 211 and the second connecting part 225 are engaged, and a step part 226 is formed on the pressure relief body 22. The step part 226 is located on the peripheral edge of the pressure relief body 22, and the step part 226 is used to avoid the connecting member 21.

[0112] Among them, see Figure 12 and Figure 13 As shown, the connector 21 can be an annular part, and multiple snap-fit ​​protrusions or multiple snap-fit ​​grooves can be provided on the periphery of the connector 21. Multiple snap-fit ​​grooves or snap-fit ​​protrusions are formed on the periphery of the first side 221, and the step portion 226 can be spaced apart from the second snap-fit ​​portion and used to avoid the connector 21.

[0113] Therefore, the pressure relief body 22 may include a first side surface 221 and a second side surface 222 arranged opposite to each other in the thickness direction, and a peripheral surface surrounding the first side surface 221 and the second side surface 222. The peripheral surface is constructed as a stepped portion 226 (i.e., the stepped portion 226 is located at the peripheral edge of the pressure relief body 22), and the stepped portion 226 can be generally constructed as an arc-shaped surface. The stepped portion 226 may also include one or more stepped surfaces located between the first side surface 221 and the second side surface 222 and having a height difference with the first side surface 221. When the first connecting portion 211 is connected to the second connecting portion 225, the stepped portion 226 can be used to avoid the first connecting portion 211, reduce the difficulty of the first connecting portion 211 and the second connecting portion 225, and increase the contact area between the connector 21 and the pressure relief body 22, thereby improving the connection stability and reliability between the pressure relief body 22 and the connector 21.

[0114] like Figure 15 and Figure 16 As shown, according to some embodiments of this application, the pressure relief body 22 includes a substrate 22a and a thickened portion 22b and / or a thinned portion 22c formed on the substrate 22a. The dimension L2 of the thickened portion 22b in the first direction is greater than the dimension L1 of the substrate 22a in the first direction, and the dimension L3 of the thinned portion 22c in the first direction is smaller than the dimension L1 of the substrate 22a in the first direction.

[0115] like Figure 4 , Figure 5 and Figure 6 As shown, in the first embodiment of this application, the pressure relief body 22 includes a substrate 22a and a thickened portion 22b formed on the substrate 22a, such as... Figure 8 , Figure 9 and Figure 10 As shown, in the second embodiment of this application, the pressure relief body 22 includes a substrate 22a and a thinning portion 22c formed on the substrate 22a. Of course, in some preferred embodiments, the thinning portion 22c and the thickening portion 22b can be formed on the substrate 22a at the same time, and the thickness dimension of the thickening portion 22b in the first direction is greater than the thickness dimension of the substrate 22a in the first direction, and the thickness dimension of the thinning portion 22c in the first direction is smaller than the thickness dimension of the substrate 22a in the first direction.

[0116] It is understandable that if the thickness of the pressure relief body 22 is set too thick, it will affect the breathability, while if the thickness of the pressure relief body 22 is set too thin, it will affect the consistency of pressure resistance. Therefore, in the design process of the pressure relief body 22, it is necessary to take into account both breathability and pressure resistance consistency.

[0117] Based on this, this application uses a hot pressing process to adjust the die and punch to process a thinned portion 22c and / or a thickened portion 22b on the pressure relief body 22. The thinned portion 22c is designed to balance water permeability and air permeability, while the thickened portion 22b is designed to improve the pressure resistance consistency of the pressure relief body 22.

[0118] According to some embodiments of this application, a weak structure 227 is formed on the thickened portion 22b and / or the thinned portion 22c to make the pressure relief body 22 suitable for releasing pressure when the pressure inside the housing 10 exceeds a pressure threshold.

[0119] Specifically, such as Figure 5 and Figure 6 As shown, in the first embodiment, a thickened portion 22b is formed on the pressure relief body 22, and a weak structure 227 is further provided on the thickened portion 22b. The weak structure 227 is used to release pressure when the pressure inside the outer casing 10 exceeds a pressure threshold, such as... Figure 9 and Figure 10 As shown, in the second embodiment, a thinning portion 22c is formed on the pressure relief body 22, and a weak structure 227 is further provided on the thinning portion 22c. The weak structure 227 is used to release pressure when the pressure inside the outer casing 10 exceeds the pressure threshold.

[0120] In the first embodiment, the thickness of the base material 22a of the pressure relief body 22 is less than the thickness of the thickened portion 22b. The total thickness is the maximum thickness of the body. The pressure relief body 22 only has a thicker area, which has a smaller impact on space occupation and can take into account both water permeability and air permeability. In the second embodiment, the thickness of the base material 22a of the pressure relief body 22 is greater than the thickness of the thinned portion 22c. For embodiments where the pressure relief body 22 itself has a larger thickness, although the larger thickness of the pressure relief body 22 can improve the pressure resistance, it will reduce the water permeability and air permeability of the pressure relief body 22. However, the present application further provides a thinned portion 22c, which can take into account both water permeability and air permeability.

[0121] According to some embodiments of this application, the weak structure 227 is constructed as a notch.

[0122] In this way, not only can the directional pressure relief of the pressure relief mechanism 20 be achieved by setting the grooves, thereby improving the protective effect of the pressure relief mechanism 20, but the weak structure 227 with grooves is easy to process and has low manufacturing cost, and can also improve the structural consistency of the pressure relief body 22.

[0123] Combination Figure 7 and Figure 15 As shown, in the first embodiment, the groove is formed in the thickened portion 22b, and the dimension L2 of the thickened portion 22b in the first direction and the depth L4 of the groove satisfy the following condition: 0.6L2≤L4≤0.9L2; combined with Figure 11 and Figure 16As shown, in the second embodiment, the groove is formed on the thinned portion 22c, and the dimension L3 of the thinned portion 22c in the first direction and the depth L4 of the groove satisfy the following condition: 0.6L3≤L4≤0.9L3.

[0124] Therefore, in the embodiment where the groove is formed in the thickened portion 22b, the groove depth satisfies 0.6L2≤L4≤0.9L2, and in the embodiment where the groove is formed in the thinned portion 22c, the groove depth satisfies 0.6L3≤L4≤0.9L3, so that the groove depth does not exceed 0.9 times the thickness of the thinned portion 22c or the thickened portion 22b, and is not less than 0.4 times the thickness of the thinned portion 22c or the thickened portion 22b, so that the groove depth is more reasonable, avoiding excessive groove depth, which would lead to a decrease in the pressure resistance consistency of the pressure relief mechanism 20, and also avoiding excessive groove depth, which would lead to the pressure relief mechanism 20 being unable to relieve pressure in time, thereby improving the reliability and stability of the pressure relief mechanism 20.

[0125] Combination Figure 15 and Figure 16 As shown, according to some embodiments of this application, a thickened portion 22b and / or a thinned portion 22c are formed on a first side surface 221 and / or a second side surface 222.

[0126] That is, in some embodiments, the thinning portion 22c and / or the thickening portion 22b are provided only on the first side 221, in other embodiments, the thinning portion 22c and / or the thickening portion 22b are provided only on the second side 222, and in a preferred embodiment, the thinning portion 22c and the thickening portion 22b are provided on both the first side 221 and the second side 222, so that the pressure relief body 22 has a symmetrical structure in the first direction.

[0127] According to some embodiments of this application, 0.5mm ≤ L1 ≤ 3mm.

[0128] For example, the thickness of the substrate 22a is 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm or 3 mm, etc.

[0129] This allows for a more reasonable thickness of the pressure relief body 22, avoiding excessive thickness to balance the space occupied by the pressure relief body 22, and avoiding excessive thickness to ensure consistent pressure resistance of the pressure relief body 22.

[0130] According to some embodiments of this application, 1.2L1≤L2≤2L1.

[0131] For example, the thickness of the thickened portion 22b is 1.2 times, 1.3 times, 1.4 times, 1.5 times, 1.6 times, 1.7 times, 1.8 times, 1.9 times, 2 times, etc., the thickness of the substrate 22a.

[0132] Therefore, by ensuring that the thickness of the thickened portion 22b does not exceed twice the thickness of the base material 22a, the overall thickness of the pressure relief body 22 can be made more reasonable, taking into account space occupancy. By ensuring that the thickness of the thickened portion 22b is not less than 1.2 times the thickness of the base material 22a, the thickness of the thickened portion 22b is made more reasonable, which can make the thickened portion 22b have a better effect on improving the pressure resistance consistency of the pressure relief body 22.

[0133] According to some embodiments of this application, 0.4L1≤L3≤0.8L1.

[0134] For example, the thickness of the thickened portion 22b is 0.4 times, 0.5 times, 0.6 times, 0.7 times, 0.8 times, etc., the thickness of the substrate 22a.

[0135] Therefore, by ensuring that the thickness of the thinned portion 22c is not less than 0.4 times the thickness of the base material 22a, the thickness of the thinned portion 22c can be avoided from being too thin, so as to ensure the pressure resistance consistency of the pressure relief body 22. By ensuring that the thickness of the thinned portion 22c is not greater than 0.8 times the thickness of the base material 22a, the thickness dimension of the thinned portion 22c is more reasonable, which can make the thinned portion 22c have a better effect on improving the air permeability of the pressure relief body 22.

[0136] For example, if the thickness of the substrate 22a is 3mm, then the thickness of the thickened portion 22b is 3.6mm to 6mm, and the thickness of the thinned portion 22c is 1.2mm to 2.4mm.

[0137] Secondly, this application provides a battery device 200, including: the battery cell 100 in the above embodiments.

[0138] Thirdly, this application provides an electrical device 300, including: the battery device 200 in the above embodiments.

[0139] Other configurations and operations of the battery cell 100, battery device 200, and electrical equipment 300 according to the embodiments of this application are known to those skilled in the art and will not be described in detail here.

[0140] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0141] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery cell, characterized in that, include: Outer shell (10); A pressure relief mechanism (20) includes a connector (21) and a pressure relief body (22). The connector (21) is connected to the pressure relief body (22) and is used to connect to the housing (10). The pressure relief body (22) has a first side (221) and a second side (222) opposite to each other in a first direction. A sealing flange (223) is formed on the second side (222). The connector (21) is adapted to press against the first side (221) so that the sealing flange (223) seals the gap between the housing (10) and the pressure relief body (22).

2. The battery cell according to claim 1, characterized in that, The second side (222) also has a limiting flange (224), the outer shell (10) has a pressure relief hole (13), the pressure relief mechanism (20) covers the pressure relief hole (13), the limiting flange (224) is adapted to push against the inner wall of the pressure relief hole (13) in a second direction, the first direction and the second direction have an angle, and the sealing flange (223) and the limiting flange (224) are spaced apart in the second direction.

3. The battery cell according to claim 1 or 2, characterized in that, The sealing flange (223) is constructed of a flexible material.

4. The battery cell according to claim 1 or 2, characterized in that, The connector (21) has a first connecting portion (211) on its peripheral edge, and the pressure relief body (22) has a second connecting portion (225) on its peripheral edge that cooperates with the first connecting portion (211).

5. The battery cell according to claim 4, characterized in that, The first connecting part (211) and the second connecting part (225) are engaged. A step part (226) is formed on the pressure relief body (22). The step part (226) is located on the peripheral edge of the pressure relief body (22) and is used to avoid the connecting member (21).

6. The battery cell according to claim 1, characterized in that, The pressure relief body (22) includes a substrate (22a) and a thickened portion (22b) and / or a thinned portion (22c) formed on the substrate (22a). The dimension L2 of the thickened portion (22b) in the first direction is greater than the dimension L1 of the substrate (22a) in the first direction, and the dimension L3 of the thinned portion (22c) in the first direction is smaller than the dimension L1 of the substrate (22a) in the first direction.

7. The battery cell according to claim 6, characterized in that, A weak structure (227) is formed on the thickened portion (22b) and / or the thinned portion (22c) to make the pressure relief body (22) suitable for releasing pressure when the pressure inside the housing (10) exceeds the pressure threshold.

8. The battery cell according to claim 7, characterized in that, The weak structure (227) is constructed as a notch.

9. The battery cell according to claim 8, characterized in that, The groove is formed in the thickened portion (22b), and the thickness of the thickened portion (22b) in the first direction and the depth of the groove L4 satisfy the following condition: 0.6L2≤L4≤0.9L2; or the groove is formed in the thinned portion (22c), and the thickness of the thinned portion (22c) in the first direction and the depth of the groove L4 satisfy the following condition: 0.6L3≤L4≤0.9L3.

10. The battery cell according to claim 6, characterized in that, The thickened portion (22b) and / or the thinned portion (22c) are formed on the first side surface (221) and / or the second side surface (222).

11. The battery cell according to any one of claims 6-10, characterized in that, 0.5mm≤L1≤3mm.

12. The battery cell according to claim 11, characterized in that, 1.2L1≤L2≤2L1.

13. The battery cell according to claim 11, characterized in that, 0.4L1≤L3≤0.8L1.

14. A battery device, characterized in that, include: The battery cell according to any one of claims 1-13.

15. An electrical appliance, characterized in that, include: The battery device according to claim 14.

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