Battery cell, battery device, and electric device

Abstract

The utility model provides a battery device and a power utilization device, a battery monomer comprises a shell, an electrode assembly, a pressure relief mechanism and a protection part, and the electrode assembly is arranged in the shell; the pressure relief mechanism is arranged on the surface of at least one side of the shell, the protection component is connected with the shell and covers the pressure relief mechanism, the protection component comprises a body part and a protruding part, the protruding part protrudes out of the side, away from the electrode assembly, of the body part, and the pressure relief mechanism is provided with a weak part; the orthographic projection contour of the protruding part towards the shell in the first direction at least partially covers the weak part so as to avoid the weak part. Therefore, the protruding part protrudes out of the body part, the protruding part at least covers the weak part so as to be at least used for avoiding the weak part of the pressure relief mechanism, the fixing stability and reliability of the pressure relief mechanism can be improved, the probability of interference between the protection component and the pressure relief mechanism can be reduced, and a valve opening space of the pressure relief mechanism is reserved; the failure probability of the pressure relief mechanism can be reduced, so that the safety of the single battery and the battery device is improved.

Description

Technical Field

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

[0002] In related technologies, in order to achieve structural protection of the area where the pressure relief mechanism is located, protective components need to be installed on the outside of the pressure relief mechanism. However, existing protective components are prone to interference with the pressure relief mechanism during assembly, and the protective effect of the protective components is limited. Utility Model Content

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. Therefore, one objective of the present invention is to provide a battery cell with improved installability.

[0004] This application also proposes a battery device using the aforementioned battery cells.

[0005] This application further proposes an electrical device employing the aforementioned battery device.

[0006] In a first aspect, this application proposes a battery cell including a housing, an electrode assembly, a pressure relief mechanism, and a protective component. The electrode assembly is disposed inside the housing. The pressure relief mechanism is disposed on at least one side surface of the housing. The protective component is connected to the housing and covers the pressure relief mechanism. The protective component includes a body portion and a protrusion portion. The protrusion portion protrudes from the side of the body portion away from the electrode assembly. The pressure relief mechanism has a weak portion. The protrusion portion at least partially covers the weak portion along the orthographic projection contour of the housing in a first direction to avoid the weak portion.

[0007] According to the battery device of the present application embodiment, by providing a pressure relief mechanism on any side surface of the housing of the battery cell, and providing a protective component on the housing, with a protrusion protruding from the main body and at least covering the weak part, so as to at least avoid the weak part of the pressure relief mechanism, it can not only improve the fixing stability and reliability of the pressure relief mechanism, but also reduce the probability of interference between the protective component and the pressure relief mechanism, and reserve the valve opening space of the pressure relief mechanism, which can reduce the probability of pressure relief mechanism failure, thereby improving the safety of the battery cell and the battery device.

[0008] According to some embodiments of this application, the housing includes: an end cap and a housing body, a pressure relief mechanism is provided on a first wall surface adjacent to the end cap and / or a second wall surface opposite to it, and a relief cavity is formed on the side of the protrusion facing the first wall surface or the second wall surface, the relief cavity is directly opposite the weak part.

[0009] In the above technical solution, the pressure relief mechanism is set on the shell, which is thinner than the end cap. The connection strength between the pressure relief mechanism and the shell is relatively poor. However, by further setting a protective component on the shell, the stability and reliability of the pressure relief mechanism can be improved. On the one hand, by setting the avoidance cavity structure, the protective component is constructed as a non-straight plate structure, which can improve the structural strength of the protective component and thus improve the protective effect of the protective component on the pressure relief mechanism. On the other hand, the space inside the avoidance cavity is more reasonable, and the avoidance effect on the pressure relief mechanism is better. This can also reduce the probability of interference between the protective component and the pressure relief mechanism, reduce the probability of abnormal stress on the pressure relief mechanism, and thus improve the reliability and stability of the pressure relief mechanism.

[0010] According to some embodiments of this application, the protective component includes: a first plate, a second plate, and a connecting plate. The first plate is constructed as an annular plate and is disposed adjacent to the housing relative to the second plate to define the main body portion and is connected to the housing. The two sides of the connecting plate are respectively connected to the first plate and the second plate, and the second plate and the connecting plate define a protrusion.

[0011] In the above technical solution, the force on the second plate can be transmitted to the first plate through the connecting plate and distributed to the shell, reducing the probability of the force being further transmitted to the pressure relief mechanism, so that the probability of the pressure relief mechanism being subjected to abnormal force is lower. When the internal pressure of the shell is abnormal, the pressure relief mechanism can open the valve in time, improving safety and reliability. Moreover, the three-dimensional structure composed of the first plate, the connecting plate and the second plate has higher structural strength, stronger impact resistance, and better protection effect on the pressure relief mechanism.

[0012] According to some embodiments of this application, the connection areas between the first plate and the connecting plate, and between the second plate and the connecting plate, are all circular arc transitions.

[0013] In the above technical solution, the extension direction of the connecting plate can be perpendicular to or have a certain angle with the thickness direction of the plate where the through hole is located, so that the cross-sectional shape of the second plate and the connecting plate can be trapezoidal, inverted trapezoidal or rectangular. While the structural strength is higher, the area where the first plate and the connecting plate are connected, and the area where the second plate and the connecting plate are connected, form an arc transition, which can improve assembly safety and reduce the probability of the protective component scratching the surrounding components, further improving the reliability and safety of the battery device.

[0014] According to some embodiments of this application, the second plate has a side surface facing the shell, and the distance between the second plate and the shell is L1. The thickness of the second plate is L2, and satisfies: 0.3L2≤L1≤20L2.

[0015] In the above technical solution, under the premise of achieving reliable and stable protection of the pressure relief mechanism, on the one hand, it can prevent the distance between the second plate and the shell from being too large, so as to take into account the space occupation; on the other hand, it can prevent the distance between the second plate and the shell from being too small, so that the distance between the second plate and the weak part on the pressure relief mechanism is more reasonable, which can reduce the probability of assembly interference, and can also improve the pressure relief response speed when the pressure relief mechanism is released.

[0016] According to some embodiments of this application, 2L2≤L1≤6L2.

[0017] According to some embodiments of this application, a through hole is provided on the first wall surface or the second wall surface, and the through hole is suitable for accommodating the pressure relief mechanism.

[0018] In the above technical solution, by providing through holes on the plate adjacent to the end cover and / or the plate opposite to the end cover, the pressure relief mechanism can be installed on the shell body, which can improve the energy density of the battery cell.

[0019] According to some embodiments of this application, a through hole is formed in the thickness direction of the first wall surface or the second wall surface. The inner wall of the through hole includes a first side and a second side connected in sequence. The first side is parallel to the thickness direction, and the second side has an angle with the first side. The opening size of the through hole on the side adjacent to the electrode assembly is smaller than the opening size of the through hole on the side away from the electrode assembly.

[0020] In the above technical solution, there is an angle between the first side and the second plate, and the first side is parallel to the thickness direction, while the second side is inclined relative to the thickness direction. Both the first side and the second side are used to connect with the pressure relief mechanism. The length of the connection area between the pressure relief mechanism and the through hole can be the sum of the length of the first side and the length of the second side. The second side, which is inclined relative to the thickness direction, can increase the weld penetration depth between the shell body and the pressure relief mechanism, so that the weld penetration depth meets the weld penetration depth requirement, thereby improving the connection strength between the pressure relief mechanism and the shell body and reducing the probability of welding defects.

[0021] More importantly, in the prior art, in order to improve the weld penetration, it is necessary to open stepped holes in the thinner bottom plate or side plate, that is, the through hole is formed as a stepped hole. However, the processing and forming of stepped holes are difficult. This application further makes the through hole structure a hole structure with chamfered corners including the first side and the second side, which can further reduce the forming difficulty of the shell body.

[0022] According to some embodiments of this application, the angle α between the thickness direction and the second side is 5° to 85°.

[0023] The above technical solution can make the tilt angle of the second side more reasonable, which can reduce the assembly difficulty, meet the weld penetration depth requirements, and effectively improve the installation stability and reliability of the pressure relief mechanism.

[0024] According to some embodiments of this application, the angle α between the thickness direction and the second side is 30° to 60°.

[0025] The above technical solution can make the tilt angle of the second side more reasonable, further reduce the processing difficulty of the shell body, and take into account the installation of the pressure relief mechanism, making the installation difficulty of the pressure relief mechanism lower and the stability and reliability after assembly higher.

[0026] According to some embodiments of this application, the thickness of the first wall or the second wall is L3, the length of the first side is L4, and satisfies: 0.1L3≤L4≤L3 / L2.

[0027] In the above technical solution, the thickness L3 of the base plate or side plate of the pressure relief mechanism and the length L4 of the first side meet the above proportional relationship. The length of the first side is set more reasonably. Under the premise of meeting the weld penetration requirements and making the weld longer, the size of the second side can also be more reasonable, so that the pre-positioning difficulty of the pressure relief mechanism overlapping the through hole is lower and the processing difficulty is lower.

[0028] According to some embodiments of this application, 0.2L3≤L4≤L3.

[0029] According to some embodiments of this application, the peripheral edge of the pressure relief mechanism has a first connecting portion and a second connecting portion, the first connecting portion corresponding to a first side and the second connecting portion corresponding to a second side.

[0030] In the above technical solution, the peripheral edge of the pressure relief mechanism includes a first connecting part that is inclined and welded to the first side, and a second connecting part that extends along the thickness direction and is welded to the second side. The arrangement of the first connecting part and the second connecting part enables flush welding between the pressure relief mechanism and the through hole, thereby improving the welding strength and welding yield.

[0031] According to some embodiments of this application, the pressure relief mechanism is disposed in the through hole, and the distance between the pressure relief mechanism and the electrode assembly is greater than or equal to the distance between the first wall and the electrode assembly, or the distance between the pressure relief mechanism and the electrode assembly is greater than or equal to the distance between the second wall and the electrode assembly.

[0032] The above technical solution can reduce the probability of the pressure relief mechanism rubbing against the electrode assembly when the electrode assembly is installed in the casing, so as to avoid the sharp corners of the pressure relief mechanism scratching the electrode assembly, and can also improve the overall safety and reliability of the battery cell.

[0033] Secondly, this application provides a battery device, including: a housing and a battery cell, the housing having an accommodating space, and the battery cell being disposed within the accommodating space.

[0034] Thirdly, this application provides an electrical device, including the battery device described in the above embodiments.

[0035] Additional aspects and advantages of this invention 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 the invention. Attached Figure Description

[0036] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0037] Figure 1 This is a schematic diagram of an electrical device according to an embodiment of this application;

[0038] Figure 2 This is a schematic diagram of a battery device according to an embodiment of this application;

[0039] Figure 3 This is a schematic diagram of a battery cell according to an embodiment of this application;

[0040] Figure 4 This is a schematic diagram of the housing, pressure relief mechanism, and protective components according to an embodiment of this application;

[0041] Figure 5 This is a side view of the housing, pressure relief mechanism, and protective components according to an embodiment of this application;

[0042] Figure 6 yes Figure 5 A partial sectional view of the midline AA;

[0043] Figure 7 yes Figure 6 The center circle shows a magnified view of a portion of region B.

[0044] Figure 8 This is a schematic diagram of the shell body according to an embodiment of this application;

[0045] Figure 9 yes Figure 8 The center circle shows an enlarged view of region C;

[0046] Figure 10 This is a schematic diagram of a pressure relief mechanism according to an embodiment of this application;

[0047] Figure 11 This is a schematic diagram of a protective component according to an embodiment of this application.

[0048] Figure label:

[0049] Battery device 100,

[0050] Box 10,

[0051] Battery cell 20, casing 21, end cap 211, casing body 212, first wall surface 212a, second wall surface 212b, electrode assembly 22, pressure relief mechanism 23, first connecting part 231, second connecting part 232, weak part 233, protective component 24, first plate 241, second plate 242, connecting plate 243, body part 24a, protrusion 24b.

[0052] Electrical device 200, controller 300, motor 400

[0053] Avoidance cavity a, through hole b, first side b1, second side b2.

[0054] First direction X. Detailed Implementation

[0055] 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.

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "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 are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to 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 utility model.

[0062] In the description of this utility model, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or it may include the first and second features not being in direct contact but being in contact through another feature between them.

[0063] In the description of this utility model, 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.

[0064] In this application, "multiple" means two or more (including two).

[0065] 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.

[0066] 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.

[0067] 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.

[0068] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells, such as forming a battery array.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0073] 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.

[0074] 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.

[0075] 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.

[0076] The technical solutions described in the embodiments of this application are applicable to battery devices and electrical equipment using battery devices.

[0077] 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.

[0078] For ease of explanation, the following embodiments use a vehicle as an example of electrical equipment.

[0079] 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 100 is installed inside the vehicle, and the battery device 100 may be located at the bottom, front, or rear of the vehicle. The battery device 100 can be used to power the vehicle; for example, the battery device 100 can serve as the vehicle's operating power source.

[0080] The vehicle may also include a controller 300 and a motor 400. The controller 300 controls the battery device 100 to supply power to the motor 400, which serves as a load, for example, for the power needs of the vehicle during starting, navigation and driving.

[0081] In some embodiments of this application, the battery device 100 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.

[0082] Please refer to the image. Figure 2 This is an exploded view of a battery device 100 provided in some embodiments of this application. The battery device 100 includes a housing 10 for housing individual battery cells 20.

[0083] The housing 10 is a component that houses the battery cells 20, providing placement space for multiple battery cells 20. The housing 10 can adopt various structures. In some embodiments, the housing 10 may include a tray and a cover, which overlap to define a placement space for accommodating the battery cells 20. 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 10 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 10 with placement space. As an example, the battery cell 20 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.

[0084] In the battery device 100, there can be one or more battery cells 20. If there are multiple battery cells 20, they can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 20 are connected in both series and parallel. Alternatively, multiple battery cells 20 can be first connected in series, parallel, or in a mixed configuration to form a battery module, and then multiple battery modules can be connected in series, parallel, or in a mixed configuration to form a whole, which is then housed within the housing 10. Another option is that all battery cells 20 can be directly connected in series, parallel, or in a mixed configuration, and then the whole consisting of all battery cells 20 is housed within the housing 10.

[0085] The battery cell 20 serves as the smallest energy unit of the battery device 100. The battery device 100 includes multiple battery cells 20, each of which includes a housing body 212, an end cap 211, and an electrode assembly 22 disposed within the housing body 212.

[0086] like Figure 3 As shown, in some embodiments, the battery cell 20 may include: a housing body 212, an end cap 211, and an electrode assembly 22, wherein the housing body 212 defines an accommodating space having an installation opening, and the electrode assembly 22 is disposed therein.

[0087] For example, the housing body 212 may include a bottom plate and a side plate. The side plate surrounds the periphery of the bottom plate and defines an accommodating space with an installation opening. The electrode assembly 22 and other functional components may be disposed in the accommodating space. The end cap 211 covers the installation opening of the housing body 212 to isolate the internal environment of the battery cell 20 from the external environment. The shape of the end cap 211 is adapted to the shape of the housing body 212. The end cap 211 may be supported by a material with a certain hardness and strength (such as aluminum alloy or carbon fiber plate). The end cap 211 can effectively protect the safety and reliability of the internal components of the housing body 212 during compression and collision.

[0088] In some embodiments, the end cap 211 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 211. The insulating element can be used to isolate the electrical connection components inside the housing body 212 from the end cap 211 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 22 and the housing body 212 to achieve insulation protection.

[0089] The casing body 212 is a component used to cooperate with the end cap 211 to form the internal environment of the battery cell 20. This internal environment can accommodate the electrode assembly 22, electrolyte, and other components. The casing body 212 and the end cap 211 can be independent components. An installation opening can be provided on the casing body 212, and the end cap 211 closes the opening at the installation opening to form the internal environment of the battery cell 20. The casing body 212 can have various shapes and sizes, such as cuboid, cylindrical, or hexagonal prism. Specifically, the shape of the casing body 212 can be determined according to the specific shape and size of the electrode assembly 22. The casing body 212 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, or plastic; this embodiment does not impose any special limitations on these materials.

[0090] Electrode terminals may be further disposed on the end cap 211 or the casing body 212. The electrode assembly 22 is the component in the battery cell 20 where the electrochemical reaction occurs. The casing body 212 may contain one or more electrode assemblies 22. The electrode assembly 22 is mainly formed by winding or stacking positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets. The portions of the positive and negative electrode sheets with active material constitute the main body of the electrode assembly 22, and the portions of the positive and negative electrode sheets without active material each constitute a tab. The positive and negative tabs may be located together at one end of the main body or at both ends of the main body. During the charging and discharging process of the battery device 100, the positive and negative active materials react with the electrolyte, and the tabs connect to the electrode terminals to form a current circuit.

[0091] In related technologies, the end cap 211 or the shell body 212 may also be provided with a pressure relief mechanism 23 for releasing internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold. In order to improve the energy density of the battery cell 20, the end cap 211 or the shell body 212 needs to be made thinner. At the same time, in order to further improve the safety of the pressure relief mechanism 23, a protective component 24 needs to be provided on the side of the pressure relief mechanism 23 away from the electrode assembly 22 to reduce the probability of the pressure relief mechanism 23 being damaged by external forces.

[0092] However, the existing end cap 211 or shell body 212 has a through hole b, but the end cap 211 or shell body 212 is relatively thin, which makes it difficult to guarantee the connection strength between the pressure relief mechanism 23 and the end cap 211 or the pressure relief mechanism 23 and the shell 212. This will reduce the safety and reliability of the battery cell 20. At the same time, the structure of the protective component 24 is fitted to the shell body 212 or end cap 211, which has limited protection effect on the pressure relief mechanism 23. Moreover, during the processing of the pressure relief mechanism 23, there are protrusions, and the protective component 24 may also interfere with the pressure relief mechanism 23, causing the pressure relief mechanism 23 to fail after assembly, which will also reduce the safety and reliability of the battery cell 20.

[0093] Based on this, this application proposes a battery device 100. On the one hand, the protective component 24 is arranged relative to the protruding shell body 212 or end cap 211, thereby achieving a spaced arrangement between the protective component 24 and the pressure relief mechanism 23. The force acting on the protective component 24 will not be directly transmitted to the pressure relief mechanism 23, which can improve the protection effect and reduce the probability of interference between the protective component 24 and the pressure relief mechanism 23, and reduce the probability of failure of the pressure relief mechanism 23, thereby improving the safety and reliability of the battery cell 20. At the same time, by providing a first side b1 and a second side b2 on the through hole b, the connection area between the shell 21 and the pressure relief mechanism 23 is larger, which can improve the connection strength between the pressure relief mechanism 23 and the shell body 212 or end cap 211, and can further improve the safety and reliability of the battery cell 20.

[0094] The following is for reference. Figures 1-11 The present invention describes a battery cell 20, a battery device 100, and an electrical device 200 according to embodiments of the present invention.

[0095] like Figure 2 and Figure 3 As shown, this application proposes a battery cell 20, which includes a housing 21, an electrode assembly 22, a pressure relief mechanism 23, and a protective component 24. The electrode assembly 22 is disposed inside the housing 21, the pressure relief mechanism 23 is disposed on at least one side surface of the housing 21, and the protective component 24 is connected to the housing 21 and covers the pressure relief mechanism 23. The protective component 24 includes a body portion 24a and a protrusion portion 24b. The protrusion portion 24b protrudes from the side of the body portion 24a away from the electrode assembly 22. The pressure relief mechanism 23 has a weak portion 233. The orthographic projection contour of the protrusion portion 24b toward the housing 21 at least partially covers the weak portion 233 to avoid the weak portion 233.

[0096] Specifically, at least one side surface of the housing 21 can be used to install the pressure relief mechanism 23. For example, the side surface where the end cap 211 is located is defined as the top surface, and the pressure relief mechanism 23 can be installed on the top surface, side surface, and bottom surface.

[0097] Furthermore, by setting a pressure relief mechanism 23 and a protective component 24 on the outer side of the pressure relief mechanism 23 (i.e., the outer surface of the housing 21), the main body 24a of the protective component 24 is connected to the outer surface of the housing 21, and the protrusion 24b of the protective component 24 protrudes from the main body 24a. The protrusion 24b can be positioned opposite to the weak part 233 of the pressure relief mechanism 23 (i.e., the orthographic projection of the protrusion 24b along the first direction X toward the housing 21 at least partially covers the weak part 233). This allows for avoidance of the weak part 233. On the one hand, external forces acting on the protective component 24 will not be directly transmitted to the pressure relief mechanism 23, reducing the probability of damage to the pressure relief mechanism 23 due to external misoperation. On the other hand, it also reduces the probability of interference between the pressure relief mechanism 23 and the protective component 24, thereby reducing the stress on the pressure relief mechanism 23 after the protective component 24 is installed, thus improving the safety and reliability of the pressure relief mechanism 23.

[0098] It is understood that the first direction X is the positive direction of the protrusion 24b toward the side surface of the housing 21 where the pressure relief mechanism 23 is provided. For example, if the pressure relief mechanism 23 is provided on the top surface, then the first direction X points directly below the housing 21 to form an orthographic projection outline on the top surface. If the pressure relief mechanism is provided on the left side, then the first direction X points directly to the right of the housing 21 to form an orthographic projection outline on the left side.

[0099] It should be noted that the pressure relief mechanism 23 can be constructed as an explosion-proof valve. The pressure relief mechanism 23 needs to be provided with a weak part 233 (such as: scoring, weakened weld, etc.) so that the pressure relief mechanism 23 can open when the internal pressure of the housing 21 exceeds the pressure threshold. However, the machining of the weak part 233 on the pressure relief mechanism 23 results in the surface of the pressure relief mechanism 23 facing the protective component 24 not being flat. The protective component 24 is set to fit the housing 21, and the protective component 24 will also occupy part of the dimensional space in the thickness direction of the housing 21, which will reduce the fixed stability of the pressure relief mechanism 23 on the housing 21. Moreover, the protective component 24 is prone to interference or contact with the weak part 233, causing the weak part 233 to be in an abnormal stress state, which will reduce the stability and reliability of the pressure relief mechanism 23, such as: opening the valve prematurely before the pressure threshold is reached, or even failure.

[0100] Of course, when the pressure relief mechanism 23 is opened for venting,

[0101] The protrusion 24b of the protective component 24 protrudes relative to the main body 24a, and a gap can be formed between the protrusion 24b and the pressure relief mechanism 23. This gap can also be used to avoid the pressure relief mechanism 23, reduce the obstruction and interference of the protective component 24 to the pressure relief mechanism 23 during the pressure relief process, and reserve valve opening space to improve the reliability and stability of the pressure relief mechanism 23.

[0102] Furthermore, this application places the protective component 24 on the housing 21, and the protrusion 24b can at least be directly opposite the weak part 233 of the pressure relief mechanism 23. During installation, the protective component 24 will not occupy the dimensional space in the thickness direction of the housing 21, so that the connection area between the pressure relief mechanism 23 and the housing 21 can be larger, which can improve the fixing stability and reliability of the pressure relief mechanism 23 on the housing 21, reduce the probability of interference, and reserve the valve opening space, which can also improve the reliability and stability of the pressure relief mechanism 23.

[0103] It is understood that the orthographic projection of the protrusion 24b toward the housing 21 along the first direction X at least partially covers the weak portion 233. The protrusion 24b may be partially or completely opposite to the weak portion 233 of the pressure relief mechanism 23. For example, the protrusion 24b may be formed as a plate, and the plate is opposite to the pressure relief mechanism 23. The protrusion 24b may also be one or more ribs, and the orthographic projection of the rib toward the plate (top plate, side plate or bottom plate) where the pressure relief mechanism 23 is located only covers the weak portion 233 on the pressure relief mechanism 23, so as to avoid the weak portion 233 protruding from the surface of the pressure relief mechanism 23 after the pressure relief mechanism 23 is machined.

[0104] The protective component 24 can be constructed as a patch structure. For example, if the pressure relief mechanism 23 is constructed as an explosion-proof valve, then the protective component 24 can be constructed as an explosion-proof valve patch.

[0105] According to the battery device 100 of the present application embodiment, by providing a pressure relief mechanism 23 on any side surface of the housing 21 of the battery cell 20, and providing a protective component 24 on the housing 21, with a protrusion 24b protruding from the body portion 24a and at least covering the weak portion 233, so as to at least avoid the weak portion 233 of the pressure relief mechanism 23, it can not only improve the fixing stability and reliability of the pressure relief mechanism 23, but also reduce the probability of interference between the protective component 24 and the pressure relief mechanism 23, and reserve the valve opening space of the pressure relief mechanism 23, which can reduce the probability of failure of the pressure relief mechanism 23, thereby improving the safety of the battery cell 20 and the battery device 100.

[0106] like Figure 6 and Figure 7 As shown, according to some embodiments of this application, the housing 21 includes an end cap 211 and a housing body 212. A pressure relief mechanism 23 is provided on a first wall surface 212a (the wall surface defined by the side plate) adjacent to the end cap 211 and / or a second wall surface 212b (the wall surface defined by the bottom plate) opposite to the housing body 212. A protective member 24 defines a relief cavity a on the side facing the first wall surface 212a or the second wall surface 212b. The relief cavity a is directly opposite the weak part 233.

[0107] Specifically, a pressure relief mechanism 23 is provided on the first wall surface 212a (side surface) or the second wall surface 212b (bottom surface) adjacent to the end cap 211 of the shell body 212. The pressure relief mechanism 23 can be provided on the area of ​​the shell 21 that is thinner than the end cap 212, which can further improve the energy density of the battery cell 20. However, since the shell body 211 is thinner, the stability of the pressure relief mechanism 23 is poor. By further providing a protective component 24 on the shell body 212, the protective component 24 is connected to the shell 21, and at least a part of the protective component 24 is spaced apart from the surface of the plate of the shell 21 with the pressure relief mechanism 24, so as to define a relief cavity a covering the pressure relief mechanism 23, the pressure relief mechanism 23 can be effectively protected and the reliability and stability of the pressure relief mechanism 23 can be improved.

[0108] In other words, by setting the pressure relief mechanism 23 on the shell 21, which is thinner than the end cap 211, the connection strength between the pressure relief mechanism 23 and the shell 21 is relatively poor. However, by further setting the protective component 24 on the shell 21, the stability and reliability of the pressure relief mechanism 23 can be improved. On the one hand, by setting the structure of the avoidance cavity a, the protective component 24 is constructed as a non-straight plate structure, which can improve the structural strength of the protective component 24 and thus improve the protective effect of the protective component 24 on the pressure relief mechanism 23. On the other hand, the space in the avoidance cavity a is more reasonable, and the avoidance effect on the pressure relief mechanism 23 is better. This can also reduce the probability of interference between the protective component 24 and the pressure relief mechanism 23, reduce the probability of abnormal stress on the pressure relief mechanism 23, and thus improve the reliability and stability of the pressure relief mechanism 23.

[0109] Combination Figure 7 and Figure 11 As shown, according to some embodiments of this application, the protective component 24 includes: a first plate 241, a second plate 242, and a connecting plate 243. The first plate 241 is constructed as an annular plate and is disposed adjacent to the housing 21 relative to the second plate 242 to define the main body portion 24a and is connected to the housing 21. The two sides of the connecting plate 243 are respectively connected to the first plate 241 and the second plate 242, and the second plate 242 and the connecting plate 243 define a protrusion 24b.

[0110] Specifically, the first plate 241 is arranged around the pressure relief mechanism 24, and the inner ring area of ​​the first plate 241 can be greater than or equal to the outline size of the pressure relief mechanism 24. The first plate 241 defines the body portion 24a and is adapted to be connected to the housing 21. The second plate 242 is located on the side of the first plate 241 away from the housing 21, so that the second plate 242 is arranged opposite to the housing 21. The second plate 242 and the connecting plate 243 can define a protrusion 24b, and the opening of the protrusion 24b faces the pressure relief mechanism 23 to form a clearance cavity a.

[0111] Therefore, the force on the second plate 242 can be transmitted to the first plate 241 through the connecting plate 243 and distributed to the housing 21, reducing the probability of the force being further transmitted to the pressure relief mechanism 23, so that the probability of the pressure relief mechanism 23 being subjected to abnormal force is lower. When the internal pressure of the housing 21 is abnormal, the pressure relief mechanism 23 can open the valve in time, improving safety and reliability. Moreover, the three-dimensional structure composed of the first plate 241, the connecting plate 243 and the second plate 242 has higher structural strength, stronger impact resistance, and better protection effect on the pressure relief mechanism 23.

[0112] exist Figure 11 In the embodiments shown, according to some embodiments of this application, the connection areas between the first plate 241 and the connecting plate 243, and between the second plate 242 and the connecting plate 243, are all rounded.

[0113] Specifically, the extension direction of the connecting plate 243 can be perpendicular to or have a certain angle with the thickness direction of the first wall surface 212a where the pressure relief mechanism 24 is located, or the second wall surface 212b where the pressure relief mechanism 24 is located, so that the cross-sectional shape of the second plate 242 and the connecting plate 243 can be trapezoidal, inverted trapezoidal or rectangular. While the structural strength is higher, the area where the first plate 241 is connected to the connecting plate 243 and the area where the second plate 242 is connected to the connecting plate 243 are formed as an arc transition, which can improve assembly safety and reduce the probability of the protective component 24 scratching the surrounding components, further improving the reliability and safety of the battery device 100.

[0114] like Figure 7 As shown, according to some embodiments of this application, the second plate 242 has a side surface facing the housing 21 with a distance of L1 from the housing 21, and the thickness of the second plate 242 is L2, satisfying: 0.3L2≤L2≤20L2.

[0115] For example, if the thickness of the second plate 242 is 1 mm, then L1 can be any value in the range of 0.3 mm to 20 mm.

[0116] Specifically, the distance L1 between the second plate 242 and the housing 21 and the sum of the thickness L2 of the second plate 242 satisfy the above-mentioned proportional relationship, making the distance between the second plate 242 and the housing 21 more reasonable. Under the premise of achieving reliable and stable protection for the pressure relief mechanism 23, on the one hand, it can prevent the distance between the second plate 242 and the housing 21 from being too large, so as to take into account the space occupation. On the other hand, it can prevent the distance between the second plate 242 and the housing 21 from being too small, so that the distance between the second plate 242 and the weak part 233 on the pressure relief mechanism 23 is more reasonable, which can reduce the probability of assembly interference. Moreover, when the pressure relief mechanism 23 releases, it can form a valve opening space and improve the release response speed.

[0117] Furthermore, 2L2≤L1≤6L2.

[0118] In other words, in a specific embodiment where the thickness of the second plate 242 is 1 mm, the distance L1 between the second plate 242 and the shell 21 can be further set to 2 mm to 6 mm.

[0119] In this way, the lower and upper limits of the distance between the second plate 242 and the shell 21 are more reasonable, the avoidance effect of the pressure relief mechanism 23 is better, and the space occupation is more reasonable.

[0120] Furthermore, a through hole b is provided on the first wall surface 212a or the second wall surface 212b, that is, a through hole b is provided on the first wall surface 212a adjacent to the shell body 212 and the end cap 211, and / or the opposite second wall surface 212b, and the through hole b is suitable for accommodating the pressure relief mechanism 23.

[0121] Combination Figure 4 and Figure 8 As shown, the end cap 211 defines the top surface of the housing 21, while the housing body 212 may include a side plate and a bottom plate. The side plate defines the first wall surface 212a of the housing 21, and the bottom plate defines the second wall surface 212b of the housing 21. The side plate is connected to the end cap 211, and the bottom plate is opposite to the end cap 211. The through hole b is formed on the first wall surface 212a or the second wall surface 212b, rather than being directly provided on the end cap 211. That is, the through hole b is formed in the housing body 212, which defines the thickness of the plate of the housing body 212 (i.e., the side plate or the bottom plate). After setting the pressure relief mechanism 23 on it, there is no need to set the pressure relief mechanism 23 on the end cap 211. The thickness of the end cap 211 can also be set to be thinner. In the overall space of the battery cell 20, there is more space to set the electrode assembly 22. The electrode assembly 22 occupies more space and has a higher energy density.

[0122] In this way, by providing a through hole b on the first wall surface 212a or the second wall surface 212b, the pressure relief mechanism 23 can be installed on the shell body 212, which can improve the energy density of the battery cell 20. At the same time, the through hole b is used to fix the pressure relief mechanism 23, making the installation of the pressure relief mechanism 23 on the shell 21 simpler and more convenient.

[0123] In addition, the through hole b allows the pressure relief mechanism 23 to directly contact the medium inside the housing 21, making the pressure relief mechanism 23 more sensitive to pressure changes inside the housing 21 and enabling it to be triggered more promptly, thereby improving its reliability.

[0124] It should be noted that although providing through holes b on the side plates or bottom plates of the shell body 212 can improve energy density, the thickness of the side plates and bottom plates is generally set to be relatively thin, which makes it difficult to guarantee the welding strength between the pressure relief mechanism 23 and the side plates or bottom plates. For example, the pressure relief mechanism 23 and the side plates or bottom plates need to achieve a weld penetration depth of 1 mm, but the thickness of the side plates or bottom plates is relatively thin, making it difficult to achieve the weld penetration depth requirement between the two, resulting in a decrease in connection strength.

[0125] Based on this, the present application provides a through hole b in the thickness direction of the first wall surface 212a or the second wall surface 212b. The inner wall of the through hole b includes a first side b1 and a second side b2 connected in sequence. The first side b1 is parallel to the thickness direction, and the second side b2 has an angle with the first side b1. The opening size of the through hole b on the side adjacent to the electrode assembly 22 is smaller than the opening size of the through hole b on the side away from the electrode assembly 22.

[0126] Specifically, see Figure 7 , Figure 8 , Figure 9 as well as Figure 10 As shown, there is an angle between the first side b1 and the second side b2. The first side b1 is parallel to the thickness direction, while the second side b2 is inclined relative to the thickness direction. Both the first side b1 and the second side b2 are used to connect to the pressure relief mechanism 23. The length of the connection area between the pressure relief mechanism 23 and the through hole b can be the sum of the length of the first side b1 and the length of the second side b2. The second side b2, which is inclined relative to the thickness direction, can increase the weld penetration depth between the shell body 212 and the pressure relief mechanism 23, so that the weld penetration depth meets the weld penetration depth requirement, thereby improving the connection strength between the pressure relief mechanism 23 and the shell body 212 and reducing the probability of welding defects.

[0127] More importantly, in the prior art, in order to improve the weld penetration, it is necessary to open stepped holes in the thinner bottom plate or side plate, that is, the through hole b is formed as a stepped hole. However, the processing and forming of stepped holes are difficult. This application further makes the through hole b constructed as a hole structure with chamfered corners, including the first side b1 and the second side b2, which can further reduce the forming difficulty of the shell body 212.

[0128] It should be noted that when the angle between the thickness direction and the second side b2 is too small, the increase in weld penetration depth achieved by the cooperation of the first side b1 and the second side b2 is limited and still cannot meet the requirements of structural strength and welding strength. When the angle between the thickness direction and the second side b2 is too large, the tilt angle of the second side b2 is too large, which makes it difficult to pre-position the pressure relief mechanism 23 in the through hole b during the assembly process, making it difficult to achieve the pre-position of the pressure relief mechanism 23 and resulting in excessive assembly difficulty of the pressure relief mechanism 23.

[0129] Based on this, this application is as follows Figure 7 As shown, the angle α between the thickness direction and the second side b2 is 5° to 85°.

[0130] For example, the angle between the thickness direction and the second side b2 is 5°, 10°, 15°, 20°, 25°, 30°, 35°, 40°, 45°, 50°, 55°, 60°, 65°, 70°, 75°, 80°, 85°, etc.

[0131] This allows for a more reasonable tilt angle on the second side b2, reducing assembly difficulty while meeting the weld penetration depth requirements, and effectively improving the installation stability and reliability of the pressure relief mechanism 23.

[0132] Furthermore, the angle α between the thickness direction and the second side b2 is 30° to 60°, that is, the angle between the thickness direction and the second side b2 is 30°, 35°, 40°, 45°, 50°, 55°, and 60°.

[0133] This allows for a more reasonable tilt angle on the second side b2, further reducing the processing difficulty of the shell body 212, while also accommodating the installation of the pressure relief mechanism 23, making the installation of the pressure relief mechanism 23 easier and improving the stability and reliability after assembly.

[0134] Combination Figure 7 and Figure 9 As shown, according to some embodiments of this application, the thickness of the first wall surface 212a or the second wall surface 212b with the through hole b is L3, the length of the first side b1 is L4, and satisfies: 0.1L3≤L4≤L3.

[0135] For example, the thickness of the bottom plate or side plate with the through hole b is 2mm, and the length of the corresponding first side b1 can be 0.2mm to 2mm.

[0136] Specifically, the thickness L3 of the base plate or side plate of the pressure relief mechanism 23 and the length L4 of the first side b1 satisfy the above-mentioned proportional relationship. The length of the first side b1 is set more reasonably. Under the premise of meeting the weld penetration requirements and making the weld longer, the size of the second side b2 can also be more reasonable, so that the pre-positioning difficulty of the pressure relief mechanism 23 overlapping the through hole b is lower and the processing difficulty is lower.

[0137] It should be noted that the through hole b may only have the first side b1, in which case the hole wall of the through hole b is set to be completely inclined relative to the thickness direction.

[0138] Furthermore, 0.2L3≤L4≤L3.

[0139] In other words, in the specific example above where the thickness of the side plate with the through hole b is 2mm, the length of the first side b1 can be 0.4mm to 2mm.

[0140] This makes the length of the first side b1 more reasonable, and the weld penetration depth of the through hole b and the pressure relief mechanism 23 more reasonable, which can reduce the processing difficulty and ensure the welding strength and welding yield.

[0141] Combination Figure 7 and Figure 10 As shown, according to some embodiments of this application, the peripheral edge of the pressure relief mechanism 23 has a first connecting portion 231 and a second connecting portion 232, the first connecting portion 231 corresponding to the first side b1, and the second connecting portion 232 corresponding to the second side b2.

[0142] In other words, the peripheral edge of the pressure relief mechanism 23 includes a first connecting part 231 that is inclined and welded to the first side b1, and a second connecting part 232 that extends along the thickness direction and is welded to the second side b2. The arrangement of the first connecting part 231 and the second connecting part 232 enables flush welding between the pressure relief mechanism 23 and the through hole b, thereby improving the welding strength and welding yield.

[0143] like Figure 7 As shown, the pressure relief mechanism 23 is disposed in the through hole b, and the distance between the pressure relief mechanism 23 and the electrode assembly 22 is greater than or equal to the distance between the first wall surface 212a and the electrode assembly 22, or the distance between the pressure relief mechanism 23 and the electrode assembly 22 is greater than or equal to the distance between the second wall surface 212b and the electrode assembly 22.

[0144] In other words, the pressure relief mechanism 23 is connected to the first side b1 through the first connecting part 231 and to the second side b2 through the second connecting part 232, so as to fix the pressure relief mechanism 23 in the first wall surface 212a or the second wall surface 212b with the through hole b. The side surface of the side plate of the first wall surface 212a or the bottom plate of the second wall surface 212b facing the electrode assembly 22 is defined as the inner side surface. The side surface of the pressure relief mechanism 23 facing the electrode assembly 22 is flush with the inner side surface or is farther away from the electrode assembly 22 than the inner side surface.

[0145] This reduces the probability of the pressure relief mechanism 23 rubbing against the electrode assembly 22 when the electrode assembly 22 is installed in the casing, thus preventing the sharp edges of the pressure relief mechanism 23 from scratching the electrode assembly 22 and improving the overall safety and reliability of the battery cell 20.

[0146] Secondly, such as Figure 1 As shown, the battery device 100 according to an embodiment of this application includes: a housing 10 and a battery cell 20.

[0147] Among them, see Figure 4 and Figure 5 As shown, the housing 10 has an accommodating space; the battery cell 20 is disposed in the accommodating space. The battery cell 20 includes: a housing 21, an electrode assembly 22 disposed in the housing 21, a pressure relief mechanism 23, and a protective component 24. A through hole b is formed on at least one side surface of the housing 21. The pressure relief mechanism 23 is disposed in the through hole b. The protective component 24 is disposed on the side of the housing 21 away from the electrode assembly 22 and covers the pressure relief mechanism 23. At least a portion of the protective component 24 protrudes from the housing 21 to avoid the pressure relief mechanism 23.

[0148] Specifically, the through hole b is formed on at least one side surface of the housing 21. For example, if the side surface where the end cap 211 is located is defined as the top surface, then the through hole b can be formed on the end cap 211 (i.e., the top surface), the side surface, and the bottom surface.

[0149] Furthermore, by providing a pressure relief mechanism 23 within the through hole b and a protective component 24 on the side of the through hole b away from the electrode assembly 22, with at least a portion of the protective component 24 protruding from the housing 21 and positioned opposite to the pressure relief mechanism 23, the pressure relief mechanism 23 can be avoided. On one hand, external forces acting on the protective component 24 will not be directly transmitted to the pressure relief mechanism 23, reducing the probability of damage to the pressure relief mechanism 23 due to external misoperation. On the other hand, it also reduces the probability of interference between the pressure relief mechanism 23 and the protective component 24, thereby reducing the stress on the pressure relief mechanism 23 after the protective component 24 is installed, thus improving the safety and reliability of the pressure relief mechanism 23.

[0150] It should be noted that a weak part 233 needs to be provided on the pressure relief mechanism 23 so that the pressure relief mechanism 23 can open when the internal pressure of the housing 21 exceeds the pressure threshold. However, the machining of the weak part 233 on the pressure relief mechanism 23 results in the surface of the pressure relief mechanism 23 facing the protective component 24 not being flat. The protective component 24 is set to fit the housing 21, and the protective component 24 will also occupy part of the dimensional space of the through hole b in the thickness direction of the housing 21. This will reduce the fixed stability of the pressure relief mechanism 23 in the through hole b. Moreover, the protective component 24 is prone to interference or contact with the pressure relief mechanism 23, causing the weak part 233 to be in an abnormal stress state. This will reduce the stability and reliability of the pressure relief mechanism 23, such as opening the valve prematurely before the pressure threshold is reached, or even failure.

[0151] Furthermore, this application places the protective component 24 on the housing 21, with the protruding portion facing the pressure relief mechanism 23. During installation, the protective component 24 will not occupy the dimensional space of the through hole b in the thickness direction of the housing 21, so that the connection area between the pressure relief mechanism 23 and the through hole b can be larger, which can improve the fixing stability and reliability of the pressure relief mechanism 23 on the housing 21, and reduce the probability of interference, which can also improve the reliability and stability of the pressure relief mechanism 23.

[0152] It is understood that at least a portion of the protective component 24 protrudes from the housing 21. This can be either the entire protective component 24 protruding from the housing 21 or only a portion of the housing 21. The portion protruding from the housing 21 can be partially or completely opposite to the pressure relief mechanism 23. For example, the protruding portion can be formed into a plate, and this plate is opposite to the pressure relief mechanism 23. The protruding portion can also have one or more ribs, and the projection outline of the ribs toward the plate (side plate or bottom plate) where the through hole b is located covers the weak part 233 on the pressure relief mechanism 23, so as to avoid the weak part 233 of the pressure relief mechanism 23 protruding from the surface of the pressure relief mechanism 23.

[0153] According to the battery device 100 of the present application embodiment, by providing a through hole b on the housing 21 of the battery cell 20 and providing a pressure relief mechanism 23 in the through hole b, and providing a protective member 24 on the housing 21, with the protruding part of the protective member 24 facing the pressure relief mechanism 23 to avoid the pressure relief mechanism 23, it can not only improve the fixing stability and reliability of the pressure relief mechanism 23, but also reduce the probability of failure of the pressure relief mechanism 23, thereby improving the safety of the battery cell 20 and the battery device 100.

[0154] Thirdly, this application provides an electrical device 200, including: the battery device 100 in the above embodiments.

[0155] Referring to the accompanying drawings, the battery device 100 of this application embodiment includes a housing 10 and a battery cell 20 disposed within the housing 10. The battery cell 20 includes a housing 21 and an electrode assembly 22 disposed within the housing 21. The housing 21 includes an end cap 211 and a housing body 212. A through hole b is formed on the side of the housing body 212 adjacent to the end cap 211 or on the surface opposite to the end cap 211. A pressure relief mechanism 23 is disposed within the through hole b, and a protective member 24 is disposed outside the through hole b. At least a portion of the protective member 24 protrudes from the housing 21 to avoid the pressure relief mechanism 23.

[0156] Other configurations and operations of the battery device 100 and the power-consuming device 200 according to the embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0157] 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 the present invention. 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.

[0158] Although embodiments of the present invention 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 the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery cell, characterized by, The shell (21) comprises: An electrode assembly (22) disposed in the shell (21); A pressure relief mechanism (23) disposed on at least one side surface of the shell (21), and a protection component (24) connected with the shell (21) and covering the pressure relief mechanism (23), the protection component (24) comprising a body portion (24a) and a protruding portion (24b) protruding from the body portion (24a) away from the electrode assembly (22), the pressure relief mechanism (23) having a weak portion (233), and a projection of the protruding portion (24b) in a first direction towards the shell (21) at least partially covering the weak portion (233) to avoid the weak portion (233). The shell (21) comprises:

2. The battery cell of claim 1, wherein, The protection component (24) comprises:

3. The battery cell of claim 2, wherein, The first plate body (241) is configured as an annular plate and is disposed adjacent to the shell (21) compared to the second plate body (242) to define the body portion (24a) and be connected with the shell (21), the connecting plate body (243) is connected with the first plate body (241) and the second plate body (242) on both sides, and the second plate body (242) and the connecting plate body (243) define the protruding portion (24b).

4. The battery cell of claim 3, wherein, The connection areas of the first plate body (241) and the connecting plate body (243), and the second plate body (242) and the connecting plate body (243) are circularly arc transitioned.

5. The battery cell of claim 3, wherein, The distance between the second plate body (242) and the shell (21) on one side surface of the shell (21) is L1, the thickness of the second plate body (242) is L2, and 0.3L2≤L1≤20L2 is satisfied.

6. The battery cell of claim 5, wherein, 2L2≤L1≤6L2.

7. The battery cell of claim 2, wherein, The first wall surface (212a) or the second wall surface (212b) is provided with a through hole (b) adapted to accommodate the pressure relief mechanism (23).

8. The battery cell of claim 7, wherein, A through hole (b) is formed in the thickness direction of the first wall surface (212a) or the second wall surface (212b), an inner wall of the through hole (b) includes a first side (b1) and a second side (b2) connected in sequence, the first side (b1) is parallel to the thickness direction, the second side (b2) has an included angle with the first side (b1), and the opening size of the through hole (b) on the side adjacent to the electrode assembly (22) is smaller than the opening size of the through hole (b) on the side away from the electrode assembly (22).

9. The battery cell of claim 8, wherein, The included angle α between the thickness direction and the second side (b2) is 5° to 85°.

10. The battery cell of claim 9, wherein, The included angle α between the thickness direction and the second side (b2) is 30° to 60°.

11. The battery cell of claim 8, wherein, The thickness dimension of the first wall surface (212a) or the second wall surface (212b) is L3, the length dimension of the first side (b1) is L4, and 0.1L3≤L4≤L3 is satisfied.

12. The battery cell of claim 11, wherein, 0.2L3≤L4≤L3.

13. The battery cell of claim 8, wherein, The circumferential side of the pressure relief mechanism (23) has a first connecting portion (231) corresponding to the first side (b1) and a second connecting portion (232) corresponding to the second side (b2).

14. The battery cell of claim 7, wherein, The pressure relief mechanism (23) is arranged in the through hole (b), and the distance between the pressure relief mechanism (23) and the electrode assembly (22) is greater than or equal to the distance between the first wall surface (212a) and the electrode assembly (22), or the distance between the pressure relief mechanism (23) and the electrode assembly (22) is greater than or equal to the distance between the second wall surface (212b) and the electrode assembly (22).

15. A battery device characterized by comprising: Comprising: A box body (10) having a containing space; The battery cell (20) of any one of claims 1-14 is arranged in the containing space.

16. An electrical device, comprising: Comprising: The battery device of claim 15.

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