Battery monomer, battery device and electric device

Abstract

The utility model discloses a battery monomer, a battery device and a power utilization device, and the battery monomer comprises a shell which is provided with a containing cavity; the electrode assembly is arranged in the accommodating cavity; the first limiting piece is arranged in the containing cavity and located on one side, in the first direction, of the electrode assembly, the first limiting piece comprises a first body part and a first protruding part, and the first protruding part protrudes towards the electrode assembly relative to the first body part; the second limiting piece is arranged in the containing cavity and located on the side, away from the first limiting piece, of the electrode assembly, the second limiting piece comprises a second body part and a second protruding part, and the second protruding part protrudes towards the electrode assembly relative to the second body part; the projection of the first protruding part in the first direction and the projection of the second protruding part in the first direction are at least partially overlapped.

Description

Technical Field

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

[0002] Battery devices are widely used in electronic devices such as mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and power tools, etc.

[0003] However, as the demand for energy density and weight reduction in battery devices increases, the spatial layout becomes more compact, and the exhaust system occupies a lot of space, resulting in insufficient internal space for battery devices, which in turn leads to lower energy density. Utility Model Content

[0004] In view of the above problems, this application provides a battery cell, a battery device, and an electrical device that can improve the safety performance of the battery cell.

[0005] In a first aspect, this application provides a battery cell, comprising: a housing having a receiving cavity; an electrode assembly disposed in the receiving cavity, the electrode assembly having a central region and edge regions located on both sides of the central region in a second direction; a first limiting member disposed in the receiving cavity and located on one side of the electrode assembly in the first direction, the first limiting member including a first body portion and a first support portion, the first support portion protruding toward the electrode assembly relative to the first body portion; and a second limiting member disposed in the receiving cavity and located on the side of the electrode assembly away from the first limiting member, the second limiting member including a second body portion and a first support portion, the first support portion protruding relative to the second body portion; wherein, in a projection plane perpendicular to the first direction, the first support portion, the second support portion, and the central region at least partially overlap.

[0006] In the embodiments of this application, the battery cell includes a casing, an electrode assembly, a first limiting member, and a second limiting member. The casing includes a receiving cavity, providing a reaction space for the electrode assembly located within the receiving cavity. The first and second limiting members are respectively disposed on both sides of the electrode assembly in a first direction, and both the first support portion of the first limiting member and the second support portion of the second limiting member can provide limiting for the electrode assembly, improving the problem of easy shaking of the electrode assembly in the first direction. In a projection plane perpendicular to the first direction, the first support portion, the second support portion, and the intermediate region at least partially overlap, allowing the first and second support portions to provide limiting for the intermediate region of the electrode assembly, further improving the stability of the intermediate region of the electrode assembly within the receiving cavity, mitigating the problem of easy slippage of the electrode plates in the intermediate region of the electrode assembly, and thereby improving the safety performance of the battery cell.

[0007] In some embodiments, the housing is provided with a pressure relief mechanism on one side of the first direction, a first limiting member is provided on the side of the electrode assembly away from the pressure relief mechanism, a second limiting member is provided on the side of the electrode assembly facing the pressure relief mechanism, and a second support portion protrudes relative to the second body portion in a direction away from the electrode assembly; wherein, in a projection plane perpendicular to the first direction, the projections of a portion of the pressure relief mechanism and the second support portion overlap, and the projections of another portion of the pressure relief mechanism and the second support portion are misaligned.

[0008] In these embodiments, an exhaust channel can be formed between the second support and the housing, allowing gas to quickly reach the pressure relief mechanism and be discharged promptly. A portion of the pressure relief mechanism and the second support overlap in projection, enabling the second support to provide support to the electrode assembly in the area where the pressure relief mechanism is located. The second and first supports cooperate to provide better containment of the electrode assembly. Another portion of the pressure relief mechanism and the second support are misaligned in projection to mitigate the impact of the second support on the normal operation of the pressure relief mechanism and improve battery safety.

[0009] In some embodiments, the first limiting member further includes a first protrusion, with at least two first protrusions disposed on both sides of the first support portion in the second direction; the second limiting member further includes a second protrusion, with at least two second protrusions located on both sides of the second support portion in the second direction, wherein, in a projection plane perpendicular to the first direction, each second protrusion and each first protrusion at least partially overlap.

[0010] In these embodiments, the first limiting member is provided with a first protrusion on both sides of the first support portion, and the second limiting member is provided with a second protrusion on both sides of the second support portion. The projections of the first protrusion and the second protrusion overlap at least partially, so that the first protrusion and the second protrusion can provide limiting in two directions to approximately the same area (e.g., the edge area) of the electrode assembly, so as to better improve the stability of the electrode assembly position and improve the safety performance of the battery cell.

[0011] In some embodiments, the electrode assembly includes an electrode body and a tab connected to one side of the electrode body, with a first protrusion abutting against the electrode body to form a clearance space for accommodating the tab between the first body portion, the two first protrusions and the electrode body.

[0012] In these embodiments, a clearance space for accommodating the tabs can be formed within the gap between the two first protrusions. When the housing is covered with an end cap assembly, the presence of the first protrusions allows them to abut against the electrode body, supporting the end cap assembly and mitigating the problem of the tabs being easily deformed by the end cap assembly, thereby further improving the safety performance of the battery cell.

[0013] In some embodiments, the electrode body has a first center in the second direction, the overlapping area of ​​the projections of the first support portion and the second support portion along the first direction has a second center in the second direction, and the distance A between the first center and the second center in the second direction is 0 to 30 mm.

[0014] In these embodiments, the distance between the first center and the second center is small, which allows the first support and the second support to provide better support to the center of the electrode assembly, thus improving the problem that the central electrode of the electrode assembly is prone to falling off during shaking.

[0015] In some embodiments, the second support portion extends along a second direction and the second support portion and the second protrusion are integrally formed;

[0016] Alternatively, the second support portion and the second protrusion portion are spaced apart.

[0017] In these alternative embodiments, the second support portion extends along the second direction and the second support portion and the second protrusion are integrally formed, which simplifies the structure of the second limiting component and facilitates its fabrication. Alternatively, the second support portion and the second protrusion are spaced apart, which reduces the space occupied by the second support portion and facilitates the rapid discharge of gas through the pressure relief mechanism.

[0018] In some embodiments, the second support portion extends along a second direction and is integrally formed with the second support portion and the second protrusion. The second support portion includes two or more sub-support portions spaced apart along a third direction, and two or more second protrusions are spaced apart along a third direction. Each second protrusion is integrally formed with each sub-support portion, and the first direction, the second direction and the third direction intersect each other.

[0019] In these alternative embodiments, the second support includes two or more sub-supports spaced apart along a third direction, and two or more second protrusions spaced apart along a third direction. By providing multiple sets of sub-supports and second protrusions spaced apart along a third direction, the force on the electrode assembly is more balanced.

[0020] In some embodiments, in the first protrusion and the second protrusion that are provided in opposite directions, the extension length L1 of the overlapping area of ​​the projection of the first protrusion and the second protrusion along the first direction is greater than or equal to 3 mm in the second direction.

[0021] In these embodiments, the overlapping area of ​​the first protrusion and the second protrusion is long enough to ensure the limiting function of the first limiting member and the second limiting member.

[0022] In some embodiments, the sum of the height of the first support portion protruding from the first body portion and the height of the second support portion protruding from the second body portion is a first height sum; in at least one set of corresponding first protrusions and second protrusions, the sum of the height of the first protrusion protruding from the first body portion and the height of the second protrusion protruding from the second body portion is a second height sum; the first height sum and the second height sum are equal.

[0023] In these embodiments, the first height and the second height are equal, so that the total height of the protrusions at different locations is equal, and the force on different positions of the electrode assembly is more balanced.

[0024] In some embodiments, the extension length L0 of the overlapping area of ​​the projection of the first support portion and the second support portion along the first direction is greater than or equal to 3 mm in the second direction.

[0025] In these embodiments, the overlapping area of ​​the first support portion and the second support portion is long enough to provide stable support to the electrode assembly, thereby improving the limiting effect of the first limiting member and the second limiting member on the electrode assembly.

[0026] In some embodiments, the second support portion extends in a third direction, and the ratio of the extension width W2 of the second support portion in the third direction to the extension width W1 of the second body portion in the third direction is 0.5 to 0.9, and the first direction and the third direction intersect.

[0027] In these embodiments, when the ratio of the extension width W2 of the second support portion in the third direction to the extension width W1 of the second body portion in the third direction is within the above-mentioned range, it can both improve the problem that the support function of the second support portion is affected by the extension width W2 of the second support portion being too small, and also improve the problem that the space occupied by the second support portion is too large due to the extension width W2 of the second support portion being too large.

[0028] In some embodiments, the projected area of ​​the pressure relief mechanism along the first direction is greater than the projected area of ​​the second support portion along the first direction.

[0029] In these embodiments, the area of ​​the pressure relief mechanism is larger than the area of ​​the second support, making it difficult for the pressure relief mechanism to be completely covered by the second support, thus ensuring the pressure relief effect.

[0030] In some embodiments, a clearance hole is provided through the second body portion, and the projection of the clearance hole along the first direction at least partially overlaps with the projection of the pressure relief mechanism along the first direction. The second support portion is located inside the clearance hole and is interconnected with the second body portion.

[0031] In these embodiments, the second body portion is provided with a clearance hole, allowing gas to be quickly transmitted through the clearance hole to the pressure relief mechanism for discharge, thereby improving the pressure relief effect. The second support portion is disposed within the clearance hole, which can improve the support of the second support portion for the electrode assembly in the area where the clearance hole is located.

[0032] Secondly, embodiments of this application provide a battery device including the battery cell described in the first aspect embodiment above.

[0033] Thirdly, embodiments of this application provide an electrical device, including the battery device described in the second aspect of the embodiment above. Attached Figure Description

[0034] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0035] Figure 1 This is a schematic diagram of the structure of a vehicle provided in one embodiment of this application;

[0036] Figure 2 This is a schematic diagram of the structure of a battery device provided in an embodiment of this application;

[0037] Figure 3 This is a schematic diagram of the battery pack structure provided in one embodiment of the application;

[0038] Figure 4 This is an exploded view of a single battery cell provided in an embodiment of this application;

[0039] Figure 5 This is a schematic diagram of the structure of the second limiting member of a battery cell provided in an embodiment of this application;

[0040] Figure 6 This is a schematic diagram of the structure of the second limiting member of a battery cell provided in one embodiment of this application from another perspective;

[0041] Figure 7 This is a schematic diagram of the structure of the second limiting member of a battery cell provided in another embodiment of this application from another perspective;

[0042] Figure 8 This is a side view of the second limiting member of a battery cell provided in an embodiment of this application;

[0043] Figure 9 This is a side view of the first limiting member of a battery cell provided in an embodiment of this application;

[0044] Figure 10This is a schematic diagram of the structure of the second limiting member of a battery cell provided in another embodiment of this application.

[0045] 10. Vehicle; 110. Motor; 120. Controller; 20. Battery unit; 201. Battery pack; 202. Housing; 2021. First housing; 2022. Second housing; 30. Individual battery cell;

[0046] 1. Outer shell; 11. Receiving cavity; 12. Opening; 13. End cap assembly; 14. Pressure relief mechanism;

[0047] 2. Electrode assembly; 21. Electrode body; 22. Tab;

[0048] 3. First limiting member; 31. First body part; 32. First protrusion; 33. First support part;

[0049] 4. Second limiting member; 41. Second body part; 42. Second protrusion; 421. First sub-protrusion; 422. Second sub-protrusion; 43. Second support part; 44. Clearance hole;

[0050] X, first direction; Y, second direction; Z, third direction. Detailed Implementation

[0051] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0052] It should be noted that, unless otherwise stated, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by those skilled in the art to which the embodiments of this application pertain.

[0053] In the description of the embodiments of this application, the technical 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., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of 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. Therefore, they should not be construed as limitations on the embodiments of this application.

[0054] Furthermore, technical terms such as "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. In the description of the embodiments of this application, "a plurality of" means two or more, unless otherwise explicitly defined.

[0055] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0056] In the description of the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0057] Currently, judging from market trends, the application of battery devices is becoming increasingly widespread. Battery devices are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely applied in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of battery device applications, market demand is also constantly increasing.

[0058] A battery device includes battery cells, which in turn include a casing and electrode assemblies located within the casing. During use, battery devices inevitably experience movement, leading to instability in the relative position of the electrode assemblies and the casing, thus affecting the safety performance of the battery cells.

[0059] Based on the above problems, this application provides a battery cell, which includes a housing and an electrode assembly, a first limiting member and a second limiting member located inside the housing. The first limiting member and the second limiting member are located on both sides of the electrode assembly in a first direction. The first limiting member and the second limiting member provide limiting to the electrode assembly from both sides of the electrode assembly in the first direction, which can improve the stability of the relative position of the electrode assembly and the housing.

[0060] The technical solutions described in the embodiments of this application are applicable to battery devices and electrical devices that use battery devices.

[0061] Electrical devices 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 devices.

[0062] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0063] 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 this application embodiment is not limited to this. The battery cell can be cylindrical, flat, cuboid, or other shapes, and this application embodiment is not limited to this either.

[0064] The battery device mentioned in the embodiments of this application refers to a single physical module comprising one or more battery cells to provide higher voltage and capacity. For example, the battery device mentioned in this application may include a battery module or a battery pack. A battery pack generally includes a housing for encapsulating one or more battery cells. The housing can prevent liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0065] A single battery cell includes electrode components and an electrolyte. The electrode components include a positive electrode, a negative electrode, and a separator. The battery cell primarily functions by the movement of metal ions between the positive and negative electrode components. The positive electrode includes a positive current collector and a positive active material layer, the latter coated on the surface of the current collector. The current collector includes a positive current-collecting section and a positive electrode tab connected to it. The current-collecting section is coated with the positive active material layer, while the tab is not. Taking a lithium-ion battery as an example, the positive current collector can be made of aluminum, and the positive active material layer includes the positive active material, which can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode sheet includes a negative current collector and a negative active material layer, the negative active material layer being coated on the surface of the negative current collector. The negative current collector includes a negative current collection section and a negative electrode tab connected to the negative current collection section. The negative current collection section is coated with the negative active material layer, while the negative electrode tab is not coated with the negative active material layer. The material of the negative current collector can be copper, and the negative active material layer includes negative active material, which can be carbon or silicon, etc. The material of the separator can be PP (polypropylene) or PE (polyethylene), etc.

[0066] It should be understood that the technical solutions described in the embodiments of this application are not limited to the battery devices and electrical devices described above, but can also be applied to all battery devices including housings and electrical devices using battery devices. However, for the sake of brevity, the following embodiments are all illustrated using electric vehicles as examples.

[0067] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 10 provided in some embodiments of this application. The vehicle 10 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 20 is provided inside the vehicle 10, and the battery device 20 can be located at the bottom, front, or rear of the vehicle 10. The battery device 20 can be used to power the vehicle 10; for example, the battery device 20 can serve as the operating power source for the vehicle 10. The vehicle 10 may also include a controller 120 and a motor 110. The controller 120 is used to control the battery to supply power to the motor 110, for example, to meet the power needs of the vehicle 10 during starting, navigation, and driving.

[0068] In some embodiments of this application, the battery device 20 can not only serve as the operating power source for the vehicle 10, but also as the driving power source for the vehicle 10, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 10.

[0069] Figure 2 A schematic diagram of the structure of a battery device 20 according to an embodiment of this application is shown. Figure 3A schematic diagram of the structure of a battery pack 201 according to an embodiment of this application is shown.

[0070] like Figure 2 and Figure 3 As shown, in some embodiments, the battery device 20 includes a housing 202 and a battery pack 201. The housing 202 includes a first housing 2021 and a second housing 2022. The battery pack 201 is located inside the housing 202 and includes a plurality of battery cells 30.

[0071] In some embodiments, the battery device 20 may be a battery pack, which includes a housing 202 and one or more battery cells 30, the battery cells 30 being housed in the housing 202.

[0072] As an example, multiple battery cells 30 can be directly fixed to the housing 202 and housed in the housing 202.

[0073] As an example, the housing 202 may include a first housing 2021 and a second housing 2022. The first housing 2021 and the second housing 2022 are fastened together to form a closed space inside the housing 202 to house the battery pack 201. Here, "closed" refers to covering or closing, which can be either sealed or unsealed. The first housing 2021 may be a top cover or a bottom wall.

[0074] Optionally, multiple individual battery cells 30 can be directly installed inside the housing 202 without forming a battery pack 201.

[0075] Figure 4 This is an exploded view of a battery cell 30 provided in one embodiment of this application. The battery cell 30 refers to the smallest unit that makes up the battery device 20. For example... Figure 4 The battery cell 30 includes an end cap assembly 13, a housing 1, and an electrode assembly 2.

[0076] Electrode assembly 2 is the component in the battery cell 30 where electrochemical reactions occur. The casing 1 may contain one or more electrode assemblies 2. Electrode assembly 2 is mainly formed by winding or stacking electrode sheets, which are divided into 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 containing active material constitute the electrode body 21, while the portions of the positive and negative electrode sheets without active material each constitute a tab 22. The positive and negative tabs 22 can be located together at one end of the electrode body 21 or separately at both ends of the electrode body 21. During the charging and discharging process of the battery cell 30, the positive and negative active materials react with the electrolyte, and the tabs 22 connect to the electrode terminals to form a current loop.

[0077] The electrode assembly 2 can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0078] In some embodiments, electrode assembly 2 is a wound structure. The positive electrode and negative electrode are wound into a wound structure.

[0079] In some embodiments, the electrode assembly 2 is a stacked structure. As an example, multiple positive and negative electrodes can be provided, with multiple positive and multiple negative electrodes stacked alternately. Multiple spacers can be provided and respectively provided between any adjacent positive or negative electrodes. Alternatively, the spacers can be provided continuously and provided between any adjacent positive or negative electrodes by folding.

[0080] In some embodiments, the electrode assembly 2 may be cylindrical, flat, or polygonal, etc.

[0081] In some embodiments, the electrode assembly 2 is provided with tabs 22, which can conduct current from the electrode assembly 2. The tabs 22 include a positive tab 22 and a negative tab 22.

[0082] The battery cell 30 may include a housing 1. The housing 1 is an assembly used to cooperate with the end cap assembly 13 to form an internal environment for the battery cell 30, wherein the formed internal environment can accommodate the electrode assembly 2, electrolyte (not shown in the figure), and other components. The housing 1 can be a steel housing, an aluminum housing, a plastic housing (such as polypropylene), a composite metal housing (such as a copper-aluminum composite housing 1), or an aluminum-plastic film, etc. In some embodiments, the housing 1 can be a sealed structure or a non-sealed structure. As an example, when the housing 1 is a non-sealed structure, the housing 1 serves to protect the electrode assembly 2, and a sealing bag is also included between the housing 1 and the electrode assembly 2. The sealing bag is used to encapsulate the electrode assembly 2 and the electrolyte. Specifically, the sealing bag can be a bag-shaped insulating component or an aluminum-plastic film. When the housing 1 is a sealed structure, it is used to encapsulate the electrode assembly 2 and electrolyte, etc.

[0083] As an example, the battery cell 30 can be a cylindrical battery cell 30, a prismatic battery cell 30, a pouch battery cell 30, or a battery cell 30 of other shapes. The prismatic battery cell 30 includes a square battery cell 30, a blade-shaped battery cell 30, and a multi-prismatic battery, such as a hexagonal prismatic battery. There are no particular limitations in this application.

[0084] The housing 1 and the end cap assembly 13 can be independent components. One or more openings 12 can be provided on the housing 1, and one or more end cap assemblies 13 can close the openings 12 to form the internal environment of the battery cell 30. Optionally, the end cap assembly 13 and the housing 1 can also be integrated. Optionally, the end cap assembly 13 and the housing 1 can form a common connection surface before other components are inserted into the housing, and the end cap assembly 13 closes the housing 1 when it is necessary to encapsulate the interior of the housing 1.

[0085] In some embodiments, the electrode terminals can be disposed on the end cap assembly 13 or on the housing 1, and the electrode terminals are electrically connected to the tabs 22. The electrode terminals can be directly connected to the tabs 22 or indirectly connected to the tabs 22 through an adapter mechanism.

[0086] Please refer to the following: Figure 4 and Figure 5 The battery cell 30 mentioned in the embodiments of this application may include: a housing 1, an electrode assembly 2, a first limiting member 3, and a second limiting member 4. The housing 1 has a receiving cavity 11; the electrode assembly 2 is disposed in the receiving cavity 11, and the electrode assembly 2 has a central region and edge regions located on both sides of the central region in the second direction Y; the first limiting member 3 is disposed in the receiving cavity 11 and located on one side of the electrode assembly 2 in the first direction X, the first limiting member 3 includes a first body portion 31 and a first support portion 33, the first support portion 33 protruding relative to the first body portion 31 toward the electrode assembly 2; the second limiting member 4 is disposed in the receiving cavity 11 and located on the side of the electrode assembly 2 away from the first limiting member 3, the second limiting member 4 includes a second body portion 41 and a second support portion 43, the second support portion 43 protruding relative to the second body portion 41; wherein, in a projection plane perpendicular to the first direction X, the first support portion 33, the second support portion 43, and the central region at least partially overlap.

[0087] Optional, Figure 4 The diagram shows the structure of the second limiting component facing the electrode component 2. Figure 5 A structural diagram showing the side of the second limiting component facing away from the electrode component 2 is presented.

[0088] In this embodiment, the battery cell 30 includes a housing 1, an electrode assembly 2, a first limiting member 3, and a second limiting member 4. The housing 1 includes a receiving cavity 11, providing a reaction space for the electrode assembly 2 located within the receiving cavity 11. The first limiting member 3 and the second limiting member 4 are respectively disposed on both sides of the electrode assembly 2 in the first direction X, and both the first support portion 33 of the first limiting member 3 and the second support portion 43 of the second limiting member 4 can provide limiting for the electrode assembly 2, improving the problem of the electrode assembly 2 easily wobbling in the first direction X. In a projection plane perpendicular to the first direction X, the first support portion 33, the second support portion 43, and the intermediate region at least partially overlap, so that the first support portion 33 and the second support portion 43 can provide limiting for the intermediate region of the electrode assembly 2, better improving the stability of the electrode assembly 2's position within the receiving cavity 11, improving the problem of the electrode sheet easily slipping off in the intermediate region of the electrode assembly 2, and thus improving the safety performance of the battery cell 30.

[0089] Optionally, the electrode assembly 2 can be a stacked cell and includes multiple electrode sheets stacked together. During the use of the battery cell 30, shaking is inevitable, causing relative sliding between adjacent electrode sheets and resulting in some electrode sheets detaching. In the battery cell 30 provided in this embodiment, since the electrode assembly 2 is limited at both ends in the first direction X by the first support portion 33 and the second support portion 43, the problem of some electrode sheets easily detaching can be improved. Optionally, the first direction X is not the direction in which the multiple electrode sheets are stacked.

[0090] Optionally, the electrode assembly 2 can be a wound cell and include wound electrode sheets. During the use of the battery cell 30, some shaking is inevitable, causing relative sliding and misalignment between adjacent electrode layers. In the battery cell 30 provided in this embodiment, since the electrode assembly 2 is limited at both ends in the first direction X by the first support portion 33 and the second support portion 43, the problem of partial electrode misalignment can be improved.

[0091] Optionally, when the electrode assembly 2 is a wound cell, the first direction X is the extension direction of the winding shaft of the wound cell, and the electrode is wound around the winding shaft extending along the first direction X.

[0092] Optionally, the first support portion abuts against the electrode assembly 2. Optionally, the electrode assembly 2 includes an electrode body 21 and a tab 22, and the housing 1 includes an opening 12 and an end cap assembly 13 covering the opening 12. Optionally, an electrode terminal is provided on the end cap assembly 13, and the tab 22 is electrically connected to the electrode terminal. Optionally, the tab 22 is disposed on at least one side of the electrode body 21 in the first direction X.

[0093] In some embodiments, please continue reading Figure 4 and Figure 5 The outer casing 1 is provided with a pressure relief mechanism 14 on one side of the first direction X. The first limiting member 3 is provided on the side of the electrode assembly 2 away from the pressure relief mechanism 14. The second limiting member 4 is provided on the side of the electrode assembly 2 facing the pressure relief mechanism 14. The second support part 43 protrudes from the second body part 41 in a direction away from the electrode assembly 2. In the projection plane perpendicular to the first direction X, the projections of a part of the pressure relief mechanism 14 and the second support part 43 overlap, and the projections of another part of the pressure relief mechanism 14 and the second support part 43 are misaligned.

[0094] In these embodiments, an exhaust channel can be formed between the second support portion 43 and the outer casing 1, allowing gas to quickly reach the pressure relief mechanism 14 and be discharged in a timely manner. A portion of the pressure relief mechanism 14 and the second support portion 43 overlap in projection, enabling the second support portion 43 to provide support to the electrode assembly 2 in the area where the pressure relief mechanism 14 is located. The second support portion 43 and the first support portion 33 cooperate to provide better containment for the electrode assembly 2. The projection of another portion of the pressure relief mechanism 14 and the second support portion 43 is misaligned to mitigate the impact of the second support portion 43 on the normal operation of the pressure relief mechanism 14 and improve battery safety performance.

[0095] Optionally, the projection of the middle region of the electrode assembly along the first direction X and the projection of the pressure relief mechanism 14 along the first direction X at least partially overlap. For example, the projection of the pressure relief mechanism 14 along the first direction X lies within the projection of the middle region along the first direction X. The projection of the edge region along the first direction X and the projection of the tab 22 along the first direction X at least partially overlap. For example, the projection of the tab 22 along the first direction X lies within the projection of the edge region along the first direction X.

[0096] Optionally, the first limiting member 3 can be reused as an insulating member for the insulating tab 22 and the end cap assembly 13. The second limiting member 4 can be reused as a bottom protective plate, and the second support portion 43 on the second limiting member 4 abuts against the inner wall of the outer casing 1 to form an exhaust space.

[0097] Optionally, in some other alternative embodiments, when the electrode assembly 2 has two tabs 22 at both ends, the materials of the first limiting member 3 and the second limiting member 4 can both include insulating materials, and the first limiting member 3 and the second limiting member 4 can both be reused as insulating members for isolating the tabs 22 and the end cap assembly 13.

[0098] In some other alternative embodiments, such as Figure 4 and Figure 5 As shown, the outer casing 1 has an opening 12 on one side in the first direction X. The battery cell 30 also includes an end cap assembly 13, which covers the opening 12. The material of the first limiting member 3 includes an insulating material, and at least a portion of the first limiting member 3 is located between the end cap assembly 13 and the electrode assembly 2.

[0099] In these embodiments, the housing 1 has an opening 12 to facilitate the insertion of the electrode assembly 2 into the receiving cavity 11. The end cap assembly 13 covers the opening 12, and the material of the first limiting member 3 includes an insulating material, that is, the first limiting member 3 is an insulating member. At least a portion of the first limiting member 3 is located between the end cap assembly 13 and the electrode assembly 2 to ensure that the electrode assembly 2 and the end cap assembly 13 are mutually insulated.

[0100] In these optional embodiments, the housing 1 is a housing 1 with an opening 12 at one end, the number of end cap assemblies 13 of the battery cell 30 is one, the tab 22 is led out from one side of the electrode body 21, and the first limiting member 3 is reused as an insulating member for isolating the tab 22 and the end cap assembly 13, that is, the first limiting member 3 is reused as the lower plastic of the end cap assembly 13.

[0101] Optionally, a through hole is provided on the first limiting member 3, and the electrode tab 22 is electrically connected to the electrode terminal on the end cap assembly 13 via the through hole.

[0102] In some embodiments, such as Figure 4 and Figure 5 As shown, the first limiting member 3 further includes a first protrusion 32, with at least two first protrusions 32 disposed on both sides of the first support member 33 in the second direction Y; the second limiting member 4 further includes a second protrusion 42, with at least two second protrusions 42 located on both sides of the second support member 43 in the second direction Y, wherein, in a projection plane perpendicular to the first direction X, each second protrusion 42 and each first protrusion 32 at least partially overlap.

[0103] In these embodiments, the first limiting member 3 is provided with a first protrusion 32 located on both sides of the first support portion 33, and the second limiting member 4 is provided with a second protrusion 42 located on both sides of the second support portion 43. The projections of the first protrusion 32 and the second protrusion 42 at least partially overlap, so that the first protrusion 32 and the second protrusion 42 can provide two-way limiting to approximately the same area (e.g., the edge area) of the electrode assembly 2, so as to better improve the stability of the position of the electrode assembly 2 and improve the safety performance of the battery cell 30.

[0104] Optionally, when the second limiting member 4 is reused as a bottom guard plate, the second protrusion 42 abuts against the inner surface of the outer shell 1 facing the receiving cavity 11, and an exhaust channel is formed between the second protrusion 42 and the outer shell 1.

[0105] In some embodiments, such as Figure 4 and Figure 5 As shown, the electrode assembly 2 includes an electrode body 21 and a tab 22 connected to one side of the electrode body 21; a first protrusion 32 abuts against the electrode body 21 to form a clearance space for accommodating the tab 22 between the first body portion 31, the two first protrusions 32 and the electrode body 21, and the first direction X and the second direction Y intersect.

[0106] In these embodiments, at least two first protrusions 32 are provided on one side of the first body portion 31, spaced apart. A clearance space for accommodating the tab 22 can be formed in the gap between the two first protrusions 32. Due to the presence of the first protrusions 32, the first protrusions 32 abut against the electrode body 21 and can play the role of supporting the end cap assembly 13, which can improve the problem of the tab 22 being easily deformed by the end cap assembly 13, and further improve the safety performance of the battery cell 30.

[0107] Optionally, both first protrusions 32 are disposed close to the end of the first body portion 31. For example, the opposite end faces of the two first protrusions 32 and the end face of the first body portion 31 in the second direction Y are at least partially coplanar, so that the distance between the two first protrusions 32 is large enough to make room for the tab 22.

[0108] Optionally, the first protrusion 32 and the second protrusion 42 are provided in a one-to-one correspondence, that is, each second protrusion 42 is correspondingly provided with a first protrusion 32, and the projections of the second protrusion 42 and its corresponding first protrusion 32 along the first direction X at least partially overlap. This can improve the limiting effect of the first limiting member 3 and the second limiting member 4 on the electrode assembly 2.

[0109] In some embodiments, such as Figure 6 As shown, the electrode body 21 has a first center in the second direction Y, and the overlapping area of ​​the projection of the first support part 33 and the second support part 43 along the first direction X has a second center in the second direction Y. The distance A between the first center and the second center in the second direction Y is 0 to 30 mm.

[0110] In these embodiments, the distance between the first center and the second center is small, which allows the first support portion 33 and the second support portion 43 to provide better support to the center of the electrode assembly 2, thereby improving the problem that the central electrode of the electrode assembly 2 is prone to falling off during shaking.

[0111] Optionally, the electrode body 21 has two first side surfaces disposed opposite each other along the second direction Y, and the two first side surfaces have a first gap between their projections in the first direction X, the midpoint of which can be a first center. The overlapping area of ​​the projections of the first support portion 33 and the second support portion 43 along the first direction X has a first width in the second direction Y, the center of which can be a second center.

[0112] When the second direction Y and the third direction Z are perpendicular, the distance between the first center and the second center in the second direction Y is: the distance between the straight line extending from the first center along the third direction Z and the straight line extending from the second center along the third direction Z.

[0113] In some embodiments, such as Figure 7As shown, the second support portion 43 extends along the second direction Y, and the second support portion 43 and the second protrusion 42 are integrally formed. This simplifies the structure of the second limiting component and facilitates its fabrication.

[0114] Alternatively, in some embodiments, such as Figures 4 to 6 As shown, the second support portion 43 and the second protrusion 42 are spaced apart. This reduces the space occupied by the second support portion 43, facilitating the rapid discharge of gas through the pressure relief mechanism 14.

[0115] In some embodiments, the second support portion 43 extends along the second direction Y and is integrally formed with the second support portion 43 and the second protrusion 42. The second support portion 43 includes two or more sub-support portions spaced apart along the third direction Z, and two or more second protrusions 42 are spaced apart along the third direction Z. Each second protrusion 42 is integrally formed with each sub-support portion, and the first direction X, the second direction Y and the third direction Z are intersected in pairs.

[0116] In these optional embodiments, the second support portion 43 includes two or more sub-support portions distributed at Z intervals along the third direction, and two or more second protrusions 42 are arranged at Z intervals along the third direction. By providing multiple sets of sub-support portions and second protrusions 42 arranged at Z intervals along the third direction, the force on the electrode assembly 2 is more balanced.

[0117] In some embodiments, such as Figure 4 and Figure 5 As shown, the second protrusion 42 includes two or more first sub-protrusions 421 arranged side by side along the third direction Z, with the first direction X, the second direction Y and the third direction Z intersecting each other.

[0118] In these embodiments, the second protrusion 42 includes two or more first sub-protrusions 421, so as to minimize the space occupied by the second protrusion 42 while ensuring support capacity, thereby increasing the energy density of the battery cell 30.

[0119] Optionally, the two or more first sub-protrusions 421 included in the second protrusion 42 may have the same shape. For example, the two or more first sub-protrusions 421 included in the second protrusion 42 may have the same height in the first direction X, the same length in the second direction Y, and the same width in the third direction Z, so as to simplify the structure of the second protrusion 42.

[0120] In some embodiments, such as Figures 4 to 6As shown, in the correspondingly arranged first protrusion 32 and second protrusion 42, the extension length L1 of the overlapping area of ​​the projections of the first protrusion 32 and the second protrusion 42 along the first direction X is greater than or equal to 3 mm in the second direction Y. The overlapping area of ​​the projections of the first protrusion 32 and the second protrusion 42 along the first direction X refers to the portion where the projections of the first protrusion 32 and the second protrusion 42 along the first direction X overlap. Figure 6 The portion of the area where the cross-section line is located and the extension length L1 in the second direction Y is schematically represented as the overlapping area of ​​the projections of the first protrusion 32 and the second protrusion 42 along the first direction X.

[0121] In these embodiments, the overlapping area of ​​the first protrusion 32 and the second protrusion 42 is long enough to ensure the limiting function of the first limiting member 3 and the second limiting member 4.

[0122] Optionally, in the battery cell 30, the end face of the first support portion 33 facing away from the first body portion 31 can abut against the electrode assembly 2. For example, the end face of the first support portion 33 facing away from the first body portion 31 can abut against the electrode body 21 of the electrode assembly 2, so that the first support portion 33 can directly provide a limiting position to the electrode assembly 2.

[0123] Optionally, in the battery cell 30, the end face of the second support portion 43 facing away from the second body portion 41 can abut against the inner wall surface of the outer casing 1, so that the second support portion 43 can directly provide a limiting position to the electrode assembly 2.

[0124] In some embodiments, such as Figures 4 to 6 As shown, the second support portion 43 extends along the third direction Z. The size of the second support portion 43 in the third direction Z is smaller than its size in the second direction Y. The first direction X, the second direction Y and the third direction Z are arranged to intersect each other.

[0125] In these embodiments, the second support portion 43 has a longer length in the third direction Z, enabling it to provide stable support to the electrode assembly 2. Since the second protrusion 42 and the second support portion 43, which are spaced apart along the second direction Y, jointly provide support to the electrode assembly 2, the extension width of the second support portion 43 in the second direction Y can be set to be relatively small.

[0126] In some embodiments, such as Figure 8 and Figure 9As shown, the sum of the height H5 of the first support portion 33 protruding from the first body portion 31 and the height H2 of the second support portion 43 protruding from the second body portion 41 is the first height sum; in at least one pair of corresponding first protrusions 32 and second protrusions 42, the sum of the height H4 of the first protrusion 32 protruding from the first body portion 31 and the height of the second protrusion H1 protruding from the second body portion 41 is the second height sum; the first height sum and the second height sum are equal.

[0127] In these embodiments, the first height and the second height are equal, so that the total height of the protrusions in different parts is equal, and the force on different positions of the electrode assembly 2 is more balanced.

[0128] In some embodiments, such as Figures 4 to 6 As shown, the extension length L0 of the overlapping area of ​​the projections of the first support portion 33 and the second support portion 43 along the first direction X is greater than or equal to 3 mm in the second direction Y. The overlapping area of ​​the projections of the first support portion 33 and the second support portion 43 along the first direction X refers to the portion where the projections of the first support portion 33 and the second support portion 43 along the first direction X overlap. Figure 6 The region where the cross-section line is located and the part extending L0 in the second direction Y is schematically represented as the overlapping area of ​​the projections of the first support part 33 and the second support part 43 along the first direction X.

[0129] In these embodiments, the overlapping area of ​​the first support portion 33 and the second support portion 43 is long enough so that the first support portion 33 and the second support portion 43 can provide stable support to the electrode assembly 2, thereby improving the limiting effect provided by the first limiting member 3 and the second limiting member 4 to the electrode assembly 2.

[0130] In some embodiments, such as Figure 6 As shown, the second support portion 43 extends along the third direction Z, and the ratio of the extension width W2 of the second support portion 43 in the third direction Z to the extension width W1 of the second body portion 41 in the third direction Z is 0.5 to 0.9. For example, the ratio of W2 to W1 is 0.5, 0.58, 0.6, 0.8, 0.9, etc.

[0131] In these embodiments, when the ratio of the extension width W2 of the second support portion 43 in the third direction Z to the extension width W1 of the second body portion 41 in the third direction Z is within the above-mentioned range, it can both improve the problem that the support function of the second support portion 43 is affected by the extension width W2 of the second support portion 43 being too small, and also improve the problem that the space occupied by the second support portion 43 is too large due to the extension width W2 of the second support portion 43 being too large.

[0132] In some embodiments, such as Figure 7As shown, the second protrusion 42 includes two or more second sub-protrusions 422 spaced apart along the third direction Z, and the first direction X, the second direction Y and the third direction Z are arranged to intersect each other.

[0133] In these embodiments, the second protrusion 42 includes a plurality of second sub-protrusions 422, which can reduce the overall size of the second protrusion 42 in the third direction Z, thereby reducing the space occupied by the second protrusion 42 while ensuring support capability.

[0134] Optionally, the second support portion 43 is located between two second sub-protrusions 422 that are spaced apart along the second direction Y.

[0135] Optionally, two or more second sub-protrusions 422 may have the same shape and area to simplify the arrangement of the second protrusions 42.

[0136] In some embodiments, such as Figure 4 and Figure 5 As shown, the projected area of ​​the pressure relief mechanism 14 along the first direction X is greater than the projected area of ​​the second support part 43 along the first direction X.

[0137] In these embodiments, the area of ​​the pressure relief mechanism 14 is larger than the area of ​​the second support portion 43, making it difficult for the pressure relief mechanism 14 to be completely covered by the second support portion 43, thus ensuring the pressure relief effect.

[0138] In some embodiments, such as Figure 10 As shown, a clearance hole 44 is provided through the second body part 41. The projection of the clearance hole 44 along the first direction X overlaps at least partially with the projection of the pressure relief mechanism 14 along the first direction X. The second support part 43 is located inside the clearance hole 44 and is connected to the second body part 41.

[0139] In these embodiments, the second body portion 41 is provided with a clearance hole 44, which allows gas to be quickly transmitted through the clearance hole 44 to the pressure relief mechanism 14 for discharge, thereby improving the pressure relief effect. The second support portion 43 is disposed in the clearance hole 44, which can improve the support of the second support portion 43 for the electrode assembly 2 in the area where the clearance hole 44 is located.

[0140] Optionally, the shape of the clearance hole 44 can be set in various ways. For example, the shape of the clearance hole 44 can be adapted to the pressure relief mechanism 14, or the distribution area of ​​the clearance hole 44 can be larger than the projected area of ​​the pressure relief mechanism 14.

[0141] Secondly, embodiments of this application provide an electrical device, including the battery device 20 described in the second aspect embodiment above.

[0142] Please see Figures 4 to 8As shown, this application embodiment provides a battery device 20, including: a housing 1 having a receiving cavity 11; an electrode assembly 2 disposed in the receiving cavity 11, the electrode assembly 2 having a central region and edge regions located on both sides of the central region in the second direction Y; a first limiting member 3 disposed in the receiving cavity 11 and located on one side of the electrode assembly 2 in the first direction X, the first limiting member 3 including a first body portion 31 and a first support portion 33, the first support portion 33 protruding relative to the first body portion 31 toward the electrode assembly 2; a second limiting member 4 disposed in the receiving cavity 11 and located on the side of the electrode assembly 2 away from the first limiting member 3, the second limiting member 4 including a second body portion 41 and a first support portion 33, the first support portion 33 protruding relative to the second body portion 41; wherein, in a projection plane perpendicular to the first direction X, the first support portion 33, the second support portion 43 and the central region at least partially overlap. The outer casing 1 has a pressure relief mechanism 14 on one side in the first direction X. A first limiting member 3 is located on the side of the electrode assembly 2 away from the pressure relief mechanism 14. A second limiting member 4 is located on the side of the electrode assembly 2 facing the pressure relief mechanism 14. The second support portion 43 protrudes from the second body portion 41 in a direction away from the electrode assembly 2. In a projection plane perpendicular to the first direction X, the projections of a portion of the pressure relief mechanism 14 and the second support portion 43 overlap, while the projections of another portion of the pressure relief mechanism 14 and the second support portion 43 are misaligned. The first limiting member 3 also includes a first protrusion 32, with at least two first protrusions 32 located on both sides of the first support portion 33 in the second direction Y. The second limiting member 4 also includes a second protrusion 42, with at least two second protrusions 42 located on both sides of the second support portion 43 in the second direction Y. In a projection plane perpendicular to the first direction X, each second protrusion 42 and each first protrusion 32 at least partially overlap. The electrode assembly 2 includes an electrode body 21 and a tab 22 connected to one side of the electrode body 21. A first protrusion 32 abuts against the electrode body 21 to form a clearance space for accommodating the tab 22 between the first body portion 31, the two first protrusions 32 and the electrode body 21.

[0143] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that, include: The outer shell has a receiving cavity; An electrode assembly is disposed in the receiving cavity, the electrode assembly having a central region and edge regions located on both sides of the central region in a second direction; A first limiting member is disposed in the receiving cavity and located on one side of the electrode assembly in a first direction. The first limiting member includes a first body portion and a first support portion. The first support portion protrudes toward the electrode assembly relative to the first body portion. The first direction and the second direction intersect. The second limiting member is disposed in the receiving cavity and located on the side of the electrode assembly opposite to the first limiting member. The second limiting member includes a second body part and a second support part, with the second support part protruding relative to the second body part. In the projection plane perpendicular to the first direction, the first support portion, the second support portion, and the intermediate region at least partially overlap.

2. The battery cell according to claim 1, characterized in that, The outer casing is provided with a pressure relief mechanism on one side in the first direction, the first limiting member is provided on the side of the electrode assembly away from the pressure relief mechanism, the second limiting member is provided on the side of the electrode assembly facing the pressure relief mechanism, and the second supporting part protrudes from the second body part in a direction away from the electrode assembly. Specifically, in a projection plane perpendicular to the first direction, a portion of the pressure relief mechanism overlaps with the projection of the second support, while another portion of the pressure relief mechanism is misaligned with the projection of the second support.

3. The battery cell according to claim 1, characterized in that, The first limiting member further includes a first protrusion, and at least two of the first protrusions are disposed on both sides of the first support in the second direction; The second limiting member further includes a second protrusion, and at least two second protrusions are located on both sides of the second support portion in the second direction. In a projection plane perpendicular to the first direction, each of the second protrusions and each of the first protrusions at least partially overlap.

4. The battery cell according to claim 3, characterized in that, The electrode assembly includes an electrode body and a tab connected to one side of the electrode body. The first protrusion abuts against the electrode body to form a clearance space for accommodating the tab between the first body portion, the two first protrusions and the electrode body.

5. The battery cell according to claim 4, characterized in that, The electrode body has a first center in the second direction, and the overlapping area of ​​the projections of the first support and the second support along the first direction has a second center in the second direction. The distance A between the first center and the second center in the second direction is 0~30mm.

6. The battery cell according to claim 3, characterized in that, The second support portion extends and is formed along the second direction, and the second support portion and the second protrusion are integrally formed; Alternatively, the second support portion and the second protrusion portion are spaced apart.

7. The battery cell according to claim 6, characterized in that, The second support portion extends and is formed along the second direction, and the second support portion and the second protrusion are integrally formed. The second support portion includes two or more sub-support portions spaced apart along a third direction, and two or more second protrusions spaced apart along the third direction. Each second protrusion is integrally formed with each sub-support portion, and the first direction, the second direction, and the third direction intersect each other.

8. The battery cell according to claim 3, characterized in that, In the first protrusion and the second protrusion that are arranged correspondingly to each other, the extension length L1 of the overlapping area of ​​the projection of the first protrusion and the second protrusion along the first direction in the second direction is greater than or equal to 3 mm.

9. The battery cell according to claim 3, characterized in that, The sum of the height at which the first support portion protrudes from the first body portion and the height at which the second support portion protrudes from the second body portion is the first height sum; In at least one set of corresponding first protrusions and second protrusions, the sum of the height of the first protrusion protruding from the first body portion and the height of the second protrusion protruding from the second body portion is equal to the second height. The first height and the second height are equal.

10. The battery cell according to claim 1, characterized in that, The overlapping area of ​​the projections of the first support portion and the second support portion along the first direction has an extension length L0 in the second direction that is greater than or equal to 3 mm, and the second direction intersects the first direction.

11. The battery cell according to claim 1, characterized in that, The second support portion extends in a third direction, and the ratio of the extension width W2 of the second support portion in the third direction to the extension width W1 of the second body portion in the third direction is 0.5 to 0.

9. The first direction and the third direction intersect.

12. The battery cell according to claim 11, characterized in that, The outer casing is provided with a pressure relief mechanism on one side of the first direction, and the projected area of ​​the pressure relief mechanism along the first direction is greater than the projected area of ​​the second support part along the first direction.

13. The battery cell according to claim 12, characterized in that, The second body portion is provided with a clearance hole, and the projection of the clearance hole along the first direction at least partially overlaps with the projection of the pressure relief mechanism along the first direction. The second support portion is located inside the clearance hole and is connected to the second body portion.

14. A battery device, characterized in that, Includes the battery cell described in any one of claims 1-13.

15. An electrical appliance, characterized in that, Includes the battery device as described in claim 14.

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