Battery monomer, battery and electric device

Abstract

The utility model discloses a battery monomer, a battery and a power utilization device. The battery monomer comprises a shell, an electrode assembly and a supporting piece, wherein the shell comprises a first wall; the electrode assembly is arranged in the shell; the supporting piece is arranged between the first wall and the electrode assembly and comprises a first supporting part and a second supporting part, and the melting point of the second supporting part is higher than that of the first supporting part. The battery monomer provided by the embodiment of the utility model can improve the reliability.

Description

Technical Field

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

[0002] With the development of new energy technology, batteries are used more and more widely, for example, in mobile phones, laptops, electric vehicles, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes and power tools.

[0003] The development of battery technology must take into account multiple design factors at the same time. For example, how to improve battery reliability is an important research direction in the battery field. Utility Model Content

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

[0005] In the first aspect, the present application provides a battery cell, comprising a shell, an electrode assembly and a support member, wherein the shell comprises a first wall; the electrode assembly is arranged in the shell; the support member is arranged between the first wall and the electrode assembly, and the support member comprises a first supporting portion and a second supporting portion, and the melting point of the second supporting portion is higher than the melting point of the first supporting portion.

[0006] In the technical solution of the embodiment of the present application, an electrode assembly and a support member are arranged in the outer shell of the battery cell. The support member is arranged between the electrode assembly and the outer shell. The support member includes a first support part with a lower melting point and a second support part with a higher melting point. The first support part can support the electrode assembly under normal working conditions and realize insulation between the electrode assembly and the outer shell. The second support part can support the electrode assembly under the working conditions of thermal runaway inside the battery cell and melting of the first support part, so that the electrode assembly and the outer shell and components such as the pressure relief mechanism arranged on the outer shell are kept spaced from each other, so that the pressure relief channels in various places in the outer shell are unobstructed, which facilitates the internal high-temperature and high-pressure fluid to be conducted to the pressure relief mechanism and discharged, thereby improving the reliability of the battery cell.

[0007] According to some embodiments of the present application, the density of the first support portion is less than that of the second support portion. By reducing the density of the first support portion, the weight of the first support portion can be reduced while maintaining the same volume, thereby reducing the overall weight of the battery cell while maintaining its supporting function and increasing energy density.

[0008] According to some embodiments of the present application, the battery cell further includes a pressure relief mechanism disposed on the first wall. In the thickness direction of the first wall, at least a portion of the first support portion is disposed opposite the pressure relief mechanism, and at least a portion of the second support portion is disposed offset from the pressure relief mechanism. Placing the support member between the electrode assembly and the pressure relief mechanism can provide some shielding and buffering in the event of thermal runaway. The second support portion, which has a higher melting point, provides reliable support for the electrode assembly, thereby improving the overall reliability of the battery cell.

[0009] According to some embodiments of the present application, the support member includes multiple second support portions, each of which is staggered with respect to the pressure relief mechanism in the thickness direction. The second support portions can be disposed between the electrode assembly and the area outside the pressure relief mechanism in the first wall, further improving smoother pressure relief for the battery cells in the event of thermal runaway.

[0010] According to some embodiments of the present application, the first support portion is provided with a pressure relief hole extending through the thickness thereof. The pressure relief hole is arranged correspondingly to the pressure relief mechanism in the thickness direction. The provision of the pressure relief hole provides a path for high-temperature, high-pressure gas within the housing to flow to the pressure relief mechanism in the event of thermal runaway, thereby improving pressure relief efficiency.

[0011] According to some embodiments of the present application, the extension dimension of the support member in the thickness direction is 0.3 mm to 5 mm, so that the support member can reduce the space inside the housing occupied by the support member while maintaining a certain structural strength.

[0012] According to some embodiments of the present application, in the thickness direction, a surface of the first support portion facing the electrode assembly is coplanar with a surface of the second support portion facing the electrode assembly. This provides a smooth surface on the side of the support member facing the electrode assembly, thereby reducing the possibility of the support member damaging the electrode assembly.

[0013] According to some embodiments of the present application, the size of the first support portion is equal to the size of the second support portion in the thickness direction; or, the size of the first support portion is larger than the size of the second support portion in the thickness direction, and the first support portion is at least partially disposed between the second support portion and the first wall. The first support portion and the second support portion can have the same size to facilitate processing and enable flexible adjustment of the positioning. Alternatively, the second support portion can be embedded in the first support portion or located on the side of the first support portion facing the electrode assembly to stabilize its position.

[0014] According to some embodiments of the present application, the first support portion and the second support portion are both in contact with the electrode assembly. The surfaces of the first support portion and the second support portion close to the electrode assembly can together form a flat surface, so that the support of the electrode assembly is stable and reliable.

[0015] According to some embodiments of the present application, the housing further includes a second wall surrounding the first wall, and a minimum spacing between an edge of the support member and the second wall in a direction perpendicular to the thickness direction is 0.5 mm to 3 mm. This provides a certain gap between the support member and the inner wall of the housing, thereby reducing the required space while still matching the size of the electrode assembly.

[0016] According to some embodiments of the present application, the support member includes a plurality of second support portions, which are spaced apart from each other. The plurality of second support portions can provide stable support for the electrode assembly in the event of thermal runaway.

[0017] According to some embodiments of the present application, the first support portion is provided with a plurality of receiving holes extending along the thickness direction, and the second support portions are embedded in the receiving holes and arranged in a one-to-one correspondence with the receiving holes. This allows the first support portion to have a larger area and the position of the second support portion to be fixed by the receiving holes, thereby improving the structural strength of the support member.

[0018] According to some embodiments of the present application, multiple second support portions extend along the first direction and are sequentially arranged in the second direction, with the thickness direction, the first direction, and the second direction intersecting each other. The second support portions can extend in a strip shape and be spaced apart to improve the stability of the support for the electrode assembly.

[0019] According to some embodiments of the present application, the first support portion is made of polypropylene plastic or polyethylene plastic, and the second support portion is made of ceramic, silicon carbide, silicate, or carbon fiber. By adjusting the processing material, the cost of the first support portion is reduced and the high-temperature resistance of the second support portion is improved.

[0020] According to some embodiments of the present application, the battery cell further includes an insulating film that surrounds the electrode assembly and is connected to the support member. The insulating film can insulate the electrode assembly from the housing, and connecting the insulating film to the support member can improve the relative positional stability between the support member and the electrode assembly.

[0021] In a second aspect, the present application provides a battery comprising a plurality of battery cells according to any one embodiment of the first aspect and a box body, wherein the plurality of battery cells are disposed in the box body.

[0022] In a third aspect, the present application provides an electrical device comprising the battery in any embodiment of the second aspect, the battery being used to provide electrical energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0024] Figure 1 A simplified schematic diagram of a vehicle provided for some embodiments of the present application;

[0025] Figure 2 An exploded schematic diagram of a battery provided in some embodiments of the present application;

[0026] Figure 3 A schematic structural diagram of a battery cell provided in some embodiments of the present application;

[0027] Figure 4 An exploded view of a battery cell provided in some embodiments of the present application;

[0028] Figure 5 for Figure 3 The cross-sectional view at AA' is shown;

[0029] Figure 6 for Figure 5 An enlarged view of the region P shown;

[0030] Figure 7 A schematic structural diagram of a support member provided in some embodiments of the present application;

[0031] Figure 8 for Figure 7 A cross-sectional view at BB' shown;

[0032] Figure 9 for Figure 7 Another cross-sectional view at BB' shown;

[0033] Figure 10 Schematic diagram of the structure of the support member provided in other embodiments of the present application.

[0034] Reference numerals:

[0035] 1000-vehicles;

[0036] 100-battery cell; 200-battery; 300-controller; 400-motor;

[0037] 10-housing; 20-electrode assembly; 30-pressure relief mechanism; 40-support member; 50-insulating film; 60-box;

[0038] 11-first wall; 12-second wall; 41-first support portion; 42-second support portion; 61-first box portion; 62-second box portion; 63-accommodation portion;

[0039] 411-accommodation hole; 412-pressure relief hole;

[0040] X-first direction; Y-second direction; Z-thickness direction. DETAILED DESCRIPTION

[0041] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0043] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0044] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0045] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0046] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0047] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0048] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0049] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0050] The battery cells can be lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-hydrogen batteries, nickel-cadmium batteries, lead-acid batteries, etc., which are not limited in the embodiments of the present application.

[0051] A battery cell typically includes an electrode assembly. This assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of a battery cell, active ions (such as lithium ions) are inserted and removed between the positive and negative electrodes. The separator, placed between the positive and negative electrodes, prevents short circuits between the positive and negative electrodes while allowing the active ions to pass through.

[0052] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0053] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is provided on either or both of the two facing surfaces of the positive electrode current collector.

[0054] As an example, the positive electrode current collector may be a metal foil or a composite current collector.

[0055] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0056] As an example, the negative electrode current collector may be a metal foil, a foamed metal, or a composite current collector.

[0057] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0058] As an example, the negative electrode current collector has two surfaces facing each other in its thickness direction, and the negative electrode active material is provided on either or both of the two facing surfaces of the negative electrode current collector.

[0059] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in battery cells. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate.

[0060] In some embodiments, the material of the positive electrode current collector may be aluminum, and the material of the negative electrode current collector may be copper.

[0061] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0062] In some embodiments, the separator is a separator. The present application has no particular limitation on the type of separator, and any known separator with a porous structure having good chemical and mechanical stability can be selected.

[0063] As an example, the main material of the isolation membrane can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramics.

[0064] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transport ions and isolate the positive and negative electrodes.

[0065] In some embodiments, the battery cell also includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. This application does not specifically limit the type of electrolyte, and the electrolyte can be selected based on needs. The electrolyte can be liquid, gel, or solid.

[0066] In some embodiments, the electrode assembly is provided with tabs that can conduct current from the electrode assembly. The tabs include a positive tab and a negative tab.

[0067] In some embodiments, a battery cell may include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing may be a steel housing, an aluminum housing, a plastic housing (e.g., polypropylene), a composite metal housing (e.g., a copper-aluminum composite housing), or an aluminum-plastic film.

[0068] In some embodiments, the housing may be provided with functional components such as electrode terminals, etc. The electrode terminals may be used to electrically connect to the electrode assembly to output or input electrical energy of the battery cell.

[0069] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes. The prismatic battery cell includes a square-shell battery cell, a blade-shaped battery cell, and a polygonal battery. The polygonal battery is, for example, a hexagonal battery, etc. There is no special limitation in this application.

[0070] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity.

[0071] In some embodiments, the battery may be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0072] In some embodiments, the battery may be a battery pack, which includes a case and battery cells, wherein the battery cells or battery modules are housed in the case.

[0073] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0074] In some embodiments, the battery may be an energy storage device, including an energy storage container, an energy storage cabinet, and the like.

[0075] A battery cell typically includes a casing and an electrode assembly disposed within it. A support member is typically provided between the electrode assembly and the casing to insulate the two. The casing may also be equipped with components such as a pressure relief mechanism to relieve pressure in the event of thermal runaway or other issues, thereby reducing the possibility of fire or explosion.

[0076] However, the existing support parts are easily deformed or melted by heat when the battery cell has thermal runaway problems, causing the electrode assembly to sink and abut against the shell, thereby blocking the original pressure relief path on this side, reducing the pressure relief efficiency and the overall reliability of the battery cell.

[0077] In view of this, an embodiment of the present application provides a technical solution, which arranges the support member to include a first support part with a lower melting point and a second support part with a higher melting point so that it partially deforms or partially melts when heated, thereby still being able to maintain a certain supporting effect, thereby improving the reliability of the battery cell.

[0078] The technical solutions described in the embodiments of the present application are applicable to batteries and electrical devices using batteries, such as mobile phones, portable devices, laptops, electric vehicles, electric cars, ships, spacecraft, electric toys and electric tools, etc., among which spacecraft include airplanes, rockets, space shuttles and spacecraft, etc., electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric airplane toys, etc., and electric 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.

[0079] The battery cells described in the embodiments of the present application are not limited to being applicable to the electrical devices described above, but for the sake of simplicity, the following embodiments are described using electric vehicles as an example.

[0080] See also Figure 1 , Figure 1 A simplified schematic diagram of a vehicle 1000 provided for some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 200 may be provided inside the vehicle 1000. Specifically, for example, the battery 200 may be provided at the bottom, front or rear of the vehicle 1000. The battery 200 may be used to power the vehicle 1000. For example, the battery 200 may serve as an operating power source for the vehicle 1000. The vehicle 1000 may further include a controller 300 and a motor 400. The controller 300 is used, for example, to control the battery 200 to power the motor 400. The battery 200 may be used for starting and navigating the vehicle 1000. Of course, the battery 200 may also be used to drive the vehicle 1000, replacing or partially replacing fuel or natural gas to provide drive for the vehicle 1000.

[0081] Figure 2 Schematic diagram of an explosion of a battery 200 provided in some embodiments of the present application. Figure 2 As shown, the battery 200 includes a case 60 and a battery cell 100 , and the battery cell 100 is accommodated in the case 60 .

[0082] The housing 60 is used to accommodate the battery cells 100 and can have various structures. In some embodiments, the housing 60 can include a first housing portion 61 and a second housing portion 62. The first housing portion 61 and the second housing portion 62 overlap each other, and the first housing portion 61 and the second housing portion 62 together define a housing portion 63 for accommodating the battery cells. The second housing portion 62 can be a hollow structure with one end open. The first housing portion 61 is a plate-like structure. The first housing portion 61 overlaps the open side of the second housing portion 62 to form a housing with a housing portion 63. The first housing portion 61 and the second housing portion 62 can also be hollow structures with one end open. The open side of the first housing portion 61 overlaps the open side of the second housing portion 62 to form the housing 60 with the housing portion 63. Of course, the first housing portion 61 and the second housing portion 62 can have various shapes, such as a cylinder, a rectangular parallelepiped, etc.

[0083] In the battery 200 , there can be one or more battery cells 100 . If there are multiple battery cells 100 , the multiple battery cells 100 can be connected in series, in parallel, or in a hybrid connection. A hybrid connection refers to a combination of series and parallel connections within the multiple battery cells 100 . Multiple battery cells 100 can be directly connected in series, in parallel, or in a hybrid connection, and then the entire battery cell 100 can be housed within the housing 60 . Alternatively, multiple battery cells 100 can be first connected in series, in parallel, or in a hybrid connection to form a battery module, and then the multiple battery modules can be connected in series, in parallel, or in a hybrid connection to form a single unit housed within the housing 60 .

[0084] In some embodiments, there are multiple battery cells 100 , which are first connected in series, in parallel, or in series to form a battery module. The multiple battery modules are then connected in series, in parallel, or in series to form a whole, which is then housed in the box 60 .

[0085] Next, combine the Figure 3 To the attached Figure 10 The structures of the battery cell 100 , the battery 200 , and the electric device are described.

[0086] Please also refer to Figures 3 to 7 , Figure 3 This is a schematic diagram of the structure of a battery cell provided in some embodiments of the present application. Figure 4 An exploded view of a battery cell provided in some embodiments of the present application, Figure 5 for Figure 3 The cross-sectional view at AA' is shown. Figure 6 for Figure 5 An enlarged view of the region P shown, Figure 7 A schematic structural diagram of a support member provided in some embodiments of the present application.

[0087] In the first aspect, the present application provides a battery cell 100, including a shell 10, an electrode assembly 20 and a support member 40, the shell 10 includes a first wall 11; the electrode assembly 20 is arranged in the shell 10; the support member 40 is arranged between the first wall 11 and the electrode assembly 20, and the support member 40 includes a first support portion 41 and a second support portion 42, and the melting point of the second support portion 42 is higher than the melting point of the first support portion 41.

[0088] The battery cell 100 includes a shell 10 for forming a receiving cavity and providing external protection, an electrode assembly 20 for storing electrical energy, a pressure relief mechanism 30 for relieving pressure when an unexpected situation such as thermal runaway occurs in the battery cell 100, and a support member 40 for supporting the electrode assembly 20.

[0089] Optionally, the shell 10 has a first wall 11, which can be a side wall portion for enclosing a receiving cavity. The shell 10 can be made of metal or plastic material, such as copper, iron, steel, aluminum and alloys thereof.

[0090] Optionally, the housing 10 includes a shell and an end cap, wherein the shell has an opening and the end cap is used to cover the opening. The shell cooperates with the end cap to form a receiving cavity, which can be used to accommodate the electrode assembly 20, electrolyte, and other components. The end cap can be connected to the shell by welding, bonding, clamping, or other means. The shell can be opened on one side and connected to one end cap, or the shell can be opened on both sides and two end caps can be connected to the openings respectively.

[0091] Optionally, the first wall 11 may be provided on the end cover, or the first wall 11 may be a partial area of ​​the shell.

[0092] The electrode assembly 20 includes a positive electrode sheet and a negative electrode sheet. Optionally, the electrode assembly 20 generates electrical energy through oxidation and reduction reactions when ions are inserted into and extracted from the positive and negative electrode sheets. Optionally, the electrode assembly 20 also includes a separator, which is used to insulate and separate the positive and negative electrode sheets. There may be one or more electrode assemblies 20. When there are multiple electrode assemblies 20, the multiple electrode assemblies 20 may be stacked.

[0093] Optionally, the battery cell 100 further includes an electrode terminal, which can be used to electrically connect to the electrode assembly 20 to output electrical energy from the battery cell 100 or input electrical energy into the battery cell 100. The electrode terminal can be provided on an end cap. For example, the battery cell 100 can include two electrode terminals, each electrically connected to the positive electrode sheet and the negative electrode sheet.

[0094] Optionally, the support member 40 is disposed between the electrode terminal and the first wall 11 . The support member 40 may be at least partially made of an insulating material to insulate one end portion of the electrode terminal from the housing 10 .

[0095] Alternatively, in the thickness direction Z, the orthographic projection of the electrode assembly 20 may be located within the contour of the support member 40, so that the support member 40 can provide uniform and reliable support; alternatively, the support member 40 may be configured as a plurality of mutually spaced sub-members, with support provided at multiple locations by the plurality of sub-members, thereby reducing the cost of the support member 40. For example, in an embodiment in which the support member 40 is configured as a plurality of sub-members, the electrode assembly 20 and the first wall 11 may be well insulated by increasing the thickness of the support member 40, for example.

[0096] The support member 40 includes a first support portion 41 and a second support portion 42. The first support portion 41 may have good insulation properties, while the second support portion 42 may have a high melting point. Optionally, the first support portion 41 may have a large area, while the second support portion 42 is configured to independently support the electrode assembly 20 after the first support portion 41 partially or entirely melts.

[0097] Optionally, the support member 40 may include a plurality of second support portions 42 spaced apart from each other, or the support member 40 may include a second support portion 42 having a certain extension size and support area.

[0098] In this way, the first support part 41 can provide good support and insulation for the electrode assembly 20. In the event of problems such as thermal runaway, the first support part 41 can be optionally melted to form an exhaust channel between the accommodating cavity in the shell 10 and the pressure relief mechanism 30 provided in the shell 10 or to expand the cross-sectional area of ​​the exhaust channel.

[0099] Optionally, the first support portion 41 can be made flexible by adjusting its material and structural form. Components such as the electrode assembly 20 disposed within the housing 10 typically experience volume changes such as thermal expansion during operation. The provision of a flexible first support portion 41 can accommodate this deformation and reduce the likelihood of stress and damage to the electrode assembly 20 during operation, thereby improving the reliability of the battery cell 100.

[0100] In the technical solution of the embodiment of the present application, an electrode assembly 20 and a support member 40 are arranged in the outer shell 10 of the battery cell 100, wherein a pressure relief mechanism 30 can be provided on the outer shell 10, and the support member 40 is arranged between the electrode assembly 20 and the outer shell 10, and the support member 40 includes a first support portion 41 with a lower melting point and a second support portion 42 with a higher melting point, wherein the first support portion 41 can support the electrode assembly 20 under normal working conditions and realize insulation between the electrode assembly 20 and the first wall 11 of the outer shell 10, and the second support portion 42 can support the electrode assembly 20 when thermal runaway occurs inside the battery cell 100 and the first support portion 41 melts and exhausts, so that the electrode assembly 20 and the outer shell 10 are kept spaced apart from each other, thereby forming a pressure relief channel with a larger cross-sectional area, which is convenient for transmitting the internal high-temperature and high-pressure fluid to the position where the pressure relief mechanism 30 is located, so that it can be discharged smoothly, thereby improving the reliability of the battery cell 100.

[0101] In some optional embodiments, the density of the first support portion 41 is less than the density of the second support portion 42 .

[0102] Optionally, the first support portion 41 may be made of a material with a lower density, so that the weight of the first support portion 41 is reduced on the basis that the first support portion 41 has a preset support size, thereby reducing the overall weight of the support member 40 .

[0103] Optionally, the first support portion 41 can be made of a material that is light, has good insulation properties, and has a certain degree of flexibility. At the same time, the first support portion 41 can also be set to have a weight-reducing structure such as a hollow structure to further reduce the weight of the support member 40.

[0104] By reducing the density of the first support portion 41 , the weight of the first support portion 41 can be reduced while maintaining the same volume, thereby reducing the overall weight of the battery cell 100 while maintaining the supporting function, thereby improving the energy density.

[0105] In some optional embodiments, the battery cell 100 further includes a pressure relief mechanism 30, which is disposed on the first wall 11; in the thickness direction Z of the first wall 11, at least a portion of the first support portion 41 is disposed opposite to the pressure relief mechanism 30, and at least a portion of the second support portion 42 is staggered with the pressure relief mechanism 30.

[0106] Alternatively, the pressure relief mechanism 30 may be disposed on the first wall 11 of the housing 10 , with the first wall 11 being disposed opposite the wall portion where the electrode terminals are located. That is, in the thickness direction Z of the first wall 11 , the pressure relief mechanism 30 and the electrode terminals may be disposed on opposite side walls, respectively.

[0107] Optionally, the pressure relief mechanism 30 and the housing 10 are independently formed components that can be connected by welding, bonding, or other means. For example, the housing 10 may be provided with a pressure relief hole that extends through the housing 10. The pressure relief mechanism 30 is mounted on the housing 10 and covers the pressure relief hole, thereby separating the space inside and outside the housing 10. Alternatively, the pressure relief mechanism 30 and the housing 10 may be integrally formed.

[0108] A weak portion may be provided in the pressure relief mechanism 30. The strength of the weak portion is lower than the strength of other areas of the housing 10, making the weak portion a portion of the pressure relief mechanism 30 that is easily broken, shattered, torn, or opened.

[0109] The weak portion can be formed in various ways. For example, a predetermined area of ​​the pressure relief mechanism 30 can be thinned to form the weak portion. Alternatively, the predetermined area of ​​the pressure relief mechanism 30 can be treated with a material to make the area weaker than other areas.

[0110] The pressure relief mechanism 30 is used to form a pressure relief channel when the battery cell 100 experiences thermal runaway. For example, when the high-temperature, high-pressure material released from the electrode assembly 20 acts on the weak portion, the weak portion ruptures, disconnecting at least a portion of the pressure relief mechanism 30 from the outer casing 10. Under the impact of the high-temperature, high-pressure material, this portion flips over or detaches from the outer casing 10, forming a pressure relief channel on the pressure relief mechanism 30.

[0111] Optionally, the support member 40 is arranged between the first wall 11 and the electrode assembly 20. For the pressure relief mechanism 30 in the first wall 11, the first support portion 41 can be optionally arranged partially corresponding to the pressure relief mechanism 30, that is, in the thickness direction Z, the orthographic projection of the first support portion 41 can cover the orthographic projection of the pressure relief mechanism 30. Optionally, the orthographic projection of the first support portion 41 can cover the orthographic projection of the electrode assembly 20.

[0112] Optionally, the second support portion 42 is staggered with the pressure relief mechanism 30 in the thickness direction Z. That is, the orthographic projection of the second support portion 42 in this direction is staggered with the orthographic projection of the pressure relief mechanism 30 and does not overlap. The second support portion 42 has a relatively high melting point and can be used to reliably support the electrode assembly 20 in the event of an unexpected situation such as thermal runaway and the first support portion 41 melting or deforming. This reduces the possibility of the electrode assembly 20 contacting the first wall 11, causing blockage of the pressure relief mechanism 30 and a reduction in pressure relief efficiency.

[0113] In some optional embodiments, the support member 40 includes a plurality of second support portions 42 . In the thickness direction Z, the plurality of second support portions 42 are staggered with respect to the pressure relief mechanism 30 .

[0114] Optionally, the support member 40 may include a plurality of second support portions 42 at the same time. By adjusting the shape structure and setting position of each second support portion 42, the support stability of the electrode assembly 20 can be improved when the first support portion 41 melts.

[0115] Optionally, the plurality of second support portions 42 may have the same shape and size to facilitate processing and replacement. The plurality of second support portions 42 may be spaced apart from each other to improve support stability.

[0116] Optionally, the plurality of second support portions 42 in the support member 40 may be staggered with the pressure relief mechanism 30 , that is, along the thickness direction Z, the orthographic projection of each second support portion 42 may not overlap with the orthographic projection of the pressure relief mechanism 30 .

[0117] Disposing multiple second support portions 42 between the area outside the pressure relief mechanism 30 in the first wall 11 and the electrode assembly 20 can reduce the possibility of the second support portions 42 interfering with the pressure relief when thermal runaway occurs, increase the possibility that the pressure relief mechanism 30 can be successfully ruptured or flipped under pressure, and further improve the pressure relief efficiency and reliability of the battery cell 100 in the event of thermal runaway.

[0118] In some optional embodiments, in the thickness direction Z, the extension dimension of the support member 40 is 0.3 mm-5 mm.

[0119] Optionally, the extension dimensions of the support member 40 in the thickness direction Z may be the same or different at each location, and the specific dimensions may be selected to be between 0.3 mm and 5 mm, for example, any one of 0.3 mm, 0.5 mm, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm or a numerical range between any two of them.

[0120] By increasing the extension dimension of the support member 40 in the thickness direction Z, the structural strength and resistance to electrical breakdown of the support member 40 can be increased, while reducing the extension dimension of the support member 40 in this direction can reduce the space required by the battery cell 100 in this direction and reduce the weight of the support member 40.

[0121] Therefore, setting the thickness of the support member 40 within this numerical range can enable the support member 40 to have good structural strength while reducing the space inside the housing 10 occupied by the support member 40.

[0122] In some optional embodiments, in the thickness direction Z, a side surface of the first support portion 41 facing the electrode assembly 20 and a side surface of the second support portion 42 facing the electrode assembly 20 are coplanar.

[0123] Optionally, the surface of one side of the support member 40 close to the electrode assembly 20 can be a smooth surface, that is, the surfaces of the first support portion 41 and the second support portion 42 close to the electrode assembly 20 can be optionally located in the same plane or the same curved surface, thereby increasing the contact area with the electrode assembly 20 and making the contact area between the two a smooth extended surface, thereby improving the support stability while reducing the possibility of the electrode assembly 20 being damaged due to contact with the uneven surface.

[0124] Optionally, depending on the shape of one end portion of the electrode assembly 20 including the support member 40, the surface of the support member 40 facing the electrode assembly 20 can be configured as a flat surface or an arcuate surface. For example, the electrode assembly 20 can be formed by winding a positive electrode sheet, a negative electrode sheet, and a separator. In embodiments where the winding axis is perpendicular or nearly perpendicular to the first wall 11, the side surface of the support member 40 can be configured as a flat surface. In embodiments where the winding axis is parallel or nearly parallel to the first wall 11, the side surface can be configured as a curved surface that at least partially matches the side surface of the wound electrode assembly 20.

[0125] Please also refer to Figure 8 and Figure 9 , Figure 8 for Figure 7 A cross-sectional view at BB' is shown. Figure 9 for Figure 7 Another cross-sectional view at BB' is shown. In some optional embodiments, in the thickness direction Z, the extension dimension of the first support portion 41 is equal to the extension dimension of the second support portion 42; or, in the thickness direction Z, the extension dimension of the first support portion 41 is greater than the extension dimension of the second support portion 42, and the first support portion 41 is at least partially disposed between the second support portion 42 and the first wall 11.

[0126] Optionally, to ensure a smooth surface on the side of the support member 40 facing the electrode assembly 20, the first support portion 41 and the second support portion 42 may have the same extension dimension in the thickness direction Z. This allows the support member 40 to have a planar surface due to the same extension dimension in embodiments where the first wall 11 extends along a plane. This facilitates machining of the first support portion 41 and the second support portion 42, and allows for more flexible adjustment of the position of the second support portion 42.

[0127] Optionally, in an embodiment where the first support portion 41 and the second support portion 42 have the same extension dimensions, the first support portion 41 and the second support portion 42 may be fixed in relative position by abutting against each other in other directions intersecting the thickness direction Z, thereby improving the stability of the support.

[0128] Optionally, the thickness of the second support portion 42 can be less than that of the first support portion 41, and the second support portion 42 can be partially embedded in the first support portion 41. For example, the first support portion 41 can be a plate-like member having a groove, and the second support portion 42 is disposed in the groove, so that the first support portion 41 is at least partially sandwiched between the second support portion 42 and the first wall 11. This can further stabilize the relative position between the first support portion 41 and the second support portion 42, reducing the possibility of displacement of the second support portion 42 due to melting of the first support portion 41 in the event of thermal runaway.

[0129] In some optional embodiments, both the first supporting portion 41 and the second supporting portion 42 abut against the electrode assembly 20 .

[0130] Optionally, the side surface of the support member 40 facing the electrode assembly 20 can extend as a whole along the plane, that is, the first support part 41 and the second support part 42 close to the surface of the electrode assembly 20 can be located in the same plane, and the plane can optionally extend parallel to the first wall 11.

[0131] Making the first support portion 41 and the second support portion 42 in the support member 40 close to the surface of the electrode assembly 20 together form a flat surface can enable the support of the electrode assembly 20 to be stable and reliable, reduce the possibility of active material falling off due to shaking of the electrode assembly 20, and thereby improve the reliability of the battery cell 100.

[0132] In some optional embodiments, the housing 10 further includes a second wall 12 arranged around the first wall 11, and in a direction perpendicular to the thickness direction Z, a minimum distance between an edge of the support member 40 and the second wall 12 is 0.5 mm-3 mm.

[0133] The outer shell 10 of the battery cell 100 encloses a housing for the electrode assembly 20. The housing can be cylindrical, rectangular, or similar in shape. The outer shell 10 includes a first wall 11, which is provided with a pressure relief mechanism 30, and a second wall 12 surrounding the first wall 11. The second wall 12 can be one or more side walls extending along the circumference of the electrode assembly 20 and enclosing a ring. One side edge of the second wall 12 in the thickness direction Z can be connected to the edge of the first wall 11.

[0134] Optionally, the support member 40 may extend along a plane or a curved surface, and its extension direction may intersect with, and optionally be perpendicular to, the thickness direction Z. The second wall 12 may extend parallel to or nearly parallel to the thickness direction Z.

[0135] Optionally, the spacing between each edge of the support member 40 and the second wall 12 can be the same or similar, specifically between 0.5mm-3mm, for example, any one of 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm or between any two thereof.

[0136] By adjusting the distance between the support member 40 and the second pen, a certain gap can be created between the support member 40 and the inner wall of the outer shell 10, thereby reducing the possibility of mutual scratching and collision, and at the same time reducing the required space size while matching the size of the electrode assembly 20.

[0137] In some optional embodiments, the support member 40 includes a plurality of second support portions 42 , and the plurality of second support portions 42 are spaced apart from each other.

[0138] Optionally, the support member 40 may include multiple second support portions 42 at the same time. Correspondingly, the support member 40 may include one or more first support portions 41. These second support portions 42 are arranged at intervals from each other. Optionally, the second support portions 42 can be evenly distributed, that is, the distribution density of the second support portions 42 in each area is the same or similar, thereby improving the stability and uniformity of the support for the electrode assembly 20.

[0139] Optionally, the plurality of second support portions 42 may have the same shape, structure and size to facilitate processing.

[0140] In some optional embodiments, the first support portion 41 is provided with a plurality of accommodating holes 411 extending along the thickness direction Z, and the second support portion 42 is embedded in the accommodating holes 411 and is provided in a one-to-one correspondence with the accommodating holes 411 .

[0141] Optionally, the first support portion 41 of the support member 40 can have a larger area. Furthermore, the first support portion 41 can be provided with a plurality of receiving holes 411 for accommodating the second support portion 42. These receiving holes 411 can be through holes, or they can be recessed along the thickness direction Z with a depth less than the thickness of the first support portion 41, thus forming blind holes. Optionally, the thickness of the second support portion 42 can match the depth of the receiving holes 411, so that the first and second support portions 42 are coplanar on the side facing the electrode assembly 20.

[0142] Optionally, the plurality of accommodating holes 411 may be evenly distributed and arranged in an array in a region corresponding to the electrode assembly 20 , so that the second supporting portion 42 serving as a support is evenly distributed after the first supporting portion 41 melts.

[0143] Optionally, the multiple accommodating holes 411 can all have the same shape and size. Correspondingly, the multiple second support parts 42 can be arranged one-to-one corresponding to the accommodating holes 411 and have the same shape and size, so that the support member 40 is easy to process and maintain.

[0144] By making the first support portion 41 have a larger area and providing the receiving hole 411 therein, the relative position of the second support portion 42 and the first support portion 41 can be fixed by the receiving hole 411 , thereby improving the stability and structural strength of the support member 40 .

[0145] See also Figure 10 , Figure 10 Schematic diagram of the structure of the support member provided in some other embodiments of the present application. In some optional embodiments, the plurality of second support portions 42 extend along the first direction X and are sequentially arranged in the second direction Y, and the thickness direction Z, the first direction X, and the second direction Y intersect in pairs.

[0146] Optionally, the second support portion 42 can be configured as a strip-shaped support structure extending along the first direction X. Multiple second support portions 42 can be configured to extend parallel to each other and be arranged sequentially and evenly spaced in the second direction Y. The first direction X, the second direction Y, and the thickness direction Z can be configured to be perpendicular to each other.

[0147] Optionally, the first direction X can intersect with the extension direction of each layer of pole pieces in the electrode assembly 20, so that it can provide stable and reliable support, while reducing the possibility of the second support portion 42 sinking into the gap between adjacent pole pieces, resulting in the electrode assembly 20 and the first wall 11 being too close.

[0148] Optionally, the plurality of second support portions 42 may have the same extension in the first direction X to facilitate processing. In embodiments where the extension of the second support portion 42 along the first direction X is less than the extension of the electrode assembly 20, the positions of the second support portions 42 along the first direction X may be different, that is, forming a distribution pattern that is at least partially staggered in the first direction X to further improve support stability.

[0149] By arranging the second support parts 42 to extend in parallel in a strip shape and to be spaced apart, the stability of supporting the electrode assembly 20 can be further improved.

[0150] In some optional embodiments, the first support portion 41 is made of polypropylene plastic or polyethylene plastic, and the second support portion 42 is made of ceramic, silicon carbide, silicate, or carbon fiber. By adjusting the processing material, the cost of the first support portion 41 is reduced, and the high temperature resistance of the second support portion 42 is improved.

[0151] The first support portion 41 of the support member 40 should have good insulation properties and a certain structural strength. Optionally, the first support portion 41 can be made of a material selected from polypropylene plastic and polyethylene plastic. Alternatively, the first support portion can be partially made of polypropylene plastic, while the remaining portion can be made of polyethylene plastic.

[0152] Optionally, the second support portion 42 should have a relatively high melting point and be able to provide stable support even after being heated. Thus, the second support portion 42 can be made of one of ceramics, silicon carbide, silicate, or carbon fiber. Alternatively, if the support member 40 includes multiple second support portions 42, each second support portion 42 can be partially made of one material and partially made of another material. Alternatively, each second support portion 42 can include a portion made of one material and another portion made of another material.

[0153] In some optional embodiments, the battery cell 100 further includes an insulating film 50, which surrounds the electrode assembly 20 and is connected to the support member 40. The insulating film 50 can insulate the electrode assembly 20 from the housing 10, and connecting the insulating film 50 to the support member 40 can improve the relative positional stability between the support member 40 and the electrode assembly 20.

[0154] Optionally, an insulating film 50 may also be provided in the battery cell 100. The insulating film 50 may extend along the circumference of the electrode assembly 20 and be provided around the electrode assembly 20 to isolate the electrode assembly 20 from the outer shell 10, while facilitating the infiltration of the electrolyte and providing a certain amount of space for releasing pressure when the battery cell 100 experiences thermal expansion or the like.

[0155] Alternatively, the insulating film 50 may be rectangular and wound to form a cylindrical structure. The space enclosed by the insulating film 50 for accommodating the electrode assembly 20 may be configured to match the cross-sectional shape of the electrode assembly 20. Furthermore, the profile of the support member 40 may be configured to be the same as the cross-sectional shape of the cylindrical structure, and the dimensions of the two may be the same or similar, so that the insulating film 50 and the support member 40 can be connected to each other to form a deep groove-shaped accommodating space with a bottom.

[0156] Alternatively, the insulating film 50 may be formed into a cylindrical structure having sidewalls and a bottom wall, with one end closed. In this embodiment, the sidewalls of the insulating film 50 may be disposed around the electrode assembly 20, and the bottom wall thereof may be located on the same side as the support member 40. Alternatively, the bottom wall of the insulating film 50 may be disposed between the support member 40 and the electrode assembly 20, or the bottom wall of the insulating film 50 may be disposed on the side of the support member 40 facing away from the electrode assembly 20.

[0157] Optionally, the insulating film 50 and the first support portion 41 of the support member 40 can be made of the same insulating material, and the thickness of the support member 40 can be greater than that of the insulating film 50. The support member 40 and the insulating film 50 can be connected by bonding, welding, pressing, etc.

[0158] By providing the insulating film 50, at least part of the electrode assembly 20 can be separated from the outer shell 10 to reduce the risk of the outer shell 10 conducting the positive and negative poles of the electrode assembly 20. After connecting the insulating film 50 to the support member 40, the reliability of the isolation can be further improved.

[0159] In some optional embodiments, the first support portion 41 is provided with a pressure relief hole 412 penetrating along the thickness direction Z. In the thickness direction Z, the pressure relief hole 412 is provided corresponding to the pressure relief mechanism 30 .

[0160] Optionally, the first support portion 41 is used to isolate the electrode assembly 20 from the first wall 11 on which the pressure relief mechanism 30 is provided. The first support portion 41 can be provided with a pressure relief hole 412 for auxiliary pressure relief. When the electrode assembly 20 thermally runs away and releases high-temperature and high-pressure substances, the high-temperature and high-pressure substances can pass through the pressure relief hole 412 and act on the pressure relief mechanism 30, thereby causing the weak part in the pressure relief mechanism 30 to rupture quickly and form a pressure relief channel to achieve timely pressure relief and reduce the risk of explosion.

[0161] Optionally, when high-temperature and high-pressure substances pass through the pressure relief hole 412, the high temperature acts on the hole wall of the pressure relief hole 412 and partially melts the first support portion 41, thereby increasing the flow area of ​​the pressure relief hole 412, improving the discharge efficiency of the high-temperature and high-pressure substances, and thereby improving the reliability of the battery cell 100.

[0162] Optionally, during the production process of the battery cell 100, metal particles may remain inside the housing 10. For example, in an embodiment where the housing 10 includes a shell and an end cap, when the end cap and the shell are welded together, metal particles generated by the welding may remain inside the housing 10. The support member 40 can insulate the pressure relief mechanism 30 from the electrode assembly 20 to reduce the risk of metal particles causing electrical conduction between the pressure relief mechanism 30 and the electrode assembly 20, thereby improving reliability.

[0163] Alternatively, the pressure relief hole 412 may be a through hole extending along the thickness direction Z. Alternatively, the pressure relief hole 412 may be a hole recessed to a certain depth along the thickness direction Z but not extending directly through the hole. In the event of thermal runaway, the high-temperature, high-pressure material may rapidly melt the inner wall of the pressure relief hole 412 in the first support portion 41, thereby opening the pressure relief hole 412 to form a through hole. This improves support and insulation reliability while maintaining good pressure relief efficiency.

[0164] In a second aspect, the present application provides a battery 200 , comprising a plurality of battery cells 100 according to any one embodiment of the first aspect and a box body 60 , wherein the plurality of battery cells 100 are disposed in the box body 60 .

[0165] In a third aspect, the present application provides an electrical device, comprising the battery 200 in any embodiment of the second aspect, and the battery 200 is used to provide electrical energy.

[0166] The battery 200 and the electrical device in the embodiment of the present application have all the beneficial effects of the battery cell 100 in the first aspect. For details, please refer to the detailed description of the battery cell 100 in the above embodiments, which will not be repeated in this embodiment.

[0167] The present embodiment provides a battery cell 100, comprising a housing 10, an electrode assembly 20, a pressure relief mechanism 30, and a support member 40. The housing 10 includes a first wall 11; the electrode assembly 20 is disposed within the housing 10; the pressure relief mechanism 30 is disposed in the first wall 11; and the support member 40 is disposed between the first wall 11 and the electrode assembly 20. The support member 40 includes a first support portion 41 and a second support portion 42. The second support portion 42 has a higher melting point than the first support portion 41. In the thickness direction Z of the first wall 11, at least a portion of the first support portion 41 is opposite the pressure relief mechanism 30, and at least a portion of the second support portion 42 is offset from the pressure relief mechanism 30. In the thickness direction Z, the first support portion 41 and the second support portion 42 have the same extension dimension, and the surfaces of the first support portion 41 and the second support portion 42 facing the electrode assembly 20 are located in the same plane. The first supporting portion 41 is provided with a plurality of receiving holes 411 arranged in an array, and the second supporting portion 42 is embedded in the receiving holes 411 and is provided in a one-to-one correspondence with the receiving holes 411 .

[0168] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery cell, characterized in that: include: a housing comprising a first wall; an electrode assembly, disposed in the housing; The support member is disposed between the first wall and the electrode assembly. The support member includes a first support portion and a second support portion. The melting point of the second support portion is higher than that of the first support portion.

2. The battery cell according to claim 1, wherein: The density of the first support portion is lower than the density of the second support portion.

3. The battery cell according to claim 1, wherein: The battery cell further includes a pressure relief mechanism, and the pressure relief mechanism is provided on the first wall; In the thickness direction of the first wall, at least a portion of the first support portion is disposed opposite to the pressure relief mechanism, and at least a portion of the second support portion is disposed staggered with the pressure relief mechanism.

4. The battery cell according to claim 3, characterized in that The support member includes a plurality of second support portions, and in the thickness direction, the plurality of second support portions are staggered with respect to the pressure relief mechanism.

5. The battery cell according to claim 3, characterized in that: The first supporting portion is provided with a pressure relief hole penetrating along the thickness direction. In the thickness direction, the pressure relief hole is provided corresponding to the pressure relief mechanism.

6. The battery cell according to claim 1, characterized in that In the thickness direction of the first wall, the size of the support member is 0.3 mm-5 mm.

7. The battery cell according to claim 1, characterized in that In the thickness direction of the first wall, a side surface of the first support portion facing the electrode assembly and a side surface of the second support portion facing the electrode assembly are coplanar.

8. The battery cell according to claim 7, characterized in that In the thickness direction, the size of the first supporting portion is equal to the size of the second supporting portion; or, In the thickness direction, a size of the first supporting portion is larger than a size of the second supporting portion, and the first supporting portion is at least partially disposed between the second supporting portion and the first wall.

9. The battery cell according to claim 7, characterized in that The first supporting portion and the second supporting portion are both in contact with the electrode assembly.

10. The battery cell according to claim 1, characterized in that The housing further includes a second wall disposed around the first wall; in a direction perpendicular to the thickness direction of the first wall, a minimum distance between an edge of the support member and the second wall is 0.5 mm to 3 mm.

11. The battery cell according to claim 1, characterized in that The supporting member includes a plurality of second supporting portions, and the plurality of second supporting portions are spaced apart from each other.

12. The battery cell according to claim 11, characterized in that The first supporting portion is provided with a plurality of accommodating holes extending along the thickness direction of the first wall, and the second supporting portions are embedded in the accommodating holes and are arranged in a one-to-one correspondence with the accommodating holes.

13. The battery cell according to claim 11, characterized in that The plurality of second support portions extend along the first direction and are sequentially arranged in the second direction, and the thickness direction of the first wall, the first direction, and the second direction intersect in pairs.

14. The battery cell according to claim 1, characterized in that The first supporting portion is made of polypropylene plastic or polyethylene plastic, and the second supporting portion is made of ceramic, silicon carbide, silicate or carbon fiber.

15. The battery cell according to claim 1, characterized in that The battery cell further includes an insulating film, which surrounds the electrode assembly and is connected to the support member.

16. A battery, characterized in that: include: A plurality of battery cells according to any one of claims 1 to 15; A box body, wherein the plurality of battery cells are arranged in the box body.

17. An electrical device, characterized in that: The battery of claim 16 is provided for providing electrical energy.

Images