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, a pressure relief mechanism, an electrode assembly and a supporting mechanism, the shell comprises a first wall part; the pressure relief mechanism is arranged on the first wall part; the electrode assembly is arranged in the shell; the supporting mechanism is arranged between the electrode assembly and the first wall part and used for supporting the electrode assembly, the supporting mechanism comprises a supporting plate and a supporting assembly, the supporting assembly is arranged between the supporting plate and the first wall part, a first gap is formed between the supporting mechanism and the first wall part, and at least part of the pressure relief mechanism is exposed to the first gap. When the electrode assembly generates a large amount of heat and steam due to thermal runaway, failure and the like, the first gap can serve as an exhaust channel, so that the heat and the steam generated by the electrode assembly can act on the pressure relief mechanism in time, pressure is effectively relieved through the pressure relief mechanism, the potential safety hazard of explosion caused by unsmooth pressure relief of the electrode assembly is reduced, and the service life of the electrode assembly is prolonged. And the reliability of the single battery is improved.

Description

Technical Field

[0001] This application belongs to the technical field of batteries, and particularly relates to a battery cell, a battery and an electrical device. Background Art

[0002] With the development of new energy technologies, batteries are more and more widely used. For example, batteries are not only applied to energy storage power systems such as hydroelectric, thermal, wind and solar power plants, but also widely used in electric vehicles such as electric bicycles, electric motorcycles and electric cars, as well as in many fields such as military equipment and aerospace.

[0003] The development of battery technology needs to consider various design factors at the same time. For example, energy density, cycle life, assembly efficiency, processing technology, etc., and the reliability of the battery also needs to be considered. Summary of the Utility Model

[0004] Embodiments of this application provide a battery cell, a battery and an electrical device, which can effectively improve reliability.

[0005] According to the first aspect of this application, this application provides a battery cell, which includes a housing, a pressure relief mechanism, an electrode assembly and a support mechanism. The housing includes a first wall portion; the pressure relief mechanism is arranged on the first wall portion; the electrode assembly is arranged inside the housing; the support mechanism is arranged between the electrode assembly and the first wall portion and is used to support the electrode assembly. The support mechanism includes a support plate and a support component. The support component is arranged between the support plate and the first wall portion, and a first gap is formed between the support plate and the first wall portion. At least part of the pressure relief mechanism is exposed to the first gap. When a large amount of heat and steam are generated by the electrode assembly due to reasons such as thermal runaway and failure, the first gap can serve as an exhaust channel, so that the heat and steam generated by the electrode assembly can act on the pressure relief mechanism in time, thereby effectively relieving pressure through the pressure relief mechanism, reducing the safety hazard of explosion caused by poor pressure relief of the electrode assembly, and improving the reliability of the battery cell.

[0006] In some embodiments, the support plate is provided with a first communication portion, and the first communication portion penetrates through the support plate in the thickness direction of the support plate, and the first communication portion communicates with the first gap. Thus, the communication between the first gap and the space on the side of the support mechanism facing the electrode assembly is realized with a very simple structure; and other structures of the support plate except the first communication portion can be used to support the electrode assembly, ensuring the support strength of the support plate.

[0007] In some embodiments, at least part of the first communication portion is disposed opposite to the pressure relief mechanism in the thickness direction. At least part of the steam generated by the electrode assembly can directly flow to the pressure relief mechanism through the first communication portion, reducing gas commutation and shortening the gas flow path, thereby further improving the pressure relief efficiency.

[0008] In some embodiments, the support assembly includes a plurality of support blocks, each of which is spaced apart and opposed to each other along a second direction, the second direction intersecting the thickness direction of the support plate, and each support block being connected to the support plate. This improves support stability and balance, and the gap between two spaced support blocks can form a portion of the first gap, which can be connected to a second gap formed between the side of the electrode assembly where the tab is provided and the outer shell, thereby enhancing gas flow within the outer shell and improving pressure relief.

[0009] In some embodiments, the support assembly includes a plurality of support frames spaced apart along a first direction, the support frames including at least two first support portions and at least two second support portions, the at least two first support portions being spaced apart in sequence along a second direction, the first direction, the second direction, and the thickness direction of the support plate being perpendicular to each other; the first support portion extending along the thickness direction, one end of the first support portion connected to the support plate, two second support portions provided between adjacent first support portions, the second support portions being inclined relative to the first support portion, the ends of the two second support portions close to the support plate being connected to the support plate, and the ends of the two second support portions away from the support plate being respectively connected to adjacent first support portions. The first support portion, the second support portion, and the support plate form a triangular space structure, providing more stable support. Furthermore, the triangular space can form part of the first gap, which can be connected to the second gap formed between the side of the electrode assembly where the tab is provided and the outer shell, thereby enhancing the gas flow capacity within the outer shell and improving the pressure relief effect.

[0010] In some embodiments, the thickness of the support plate is H1, the height of the support assembly along the thickness direction is H2, and H1 and H2 satisfy: 0.1≤H2 / H1≤10. This can achieve a balance between the structural strength of the support mechanism, the weight of the battery cell, and the pressure relief effect.

[0011] In some embodiments, the support plate and the support assembly are an integrally formed structure, which simplifies the process and structure.

[0012] In some embodiments, the electrode assembly includes a main body and a tab, the tab being disposed at at least one end of the main body along a first direction intersecting the arrangement direction of the support mechanism and the electrode assembly. The housing includes a second wall, disposed on a side of the tab facing away from the main body. A second gap is formed between the main body and the second wall, and the second gap is connected to the first gap. This enhances gas flow within the housing, allowing gas pressure within the second gap to act on the pressure relief mechanism through the first gap, improving the pressure relief effect.

[0013] In some embodiments, the support plate includes a protruding portion protruding from the main body portion in the first direction. The protruding portion is provided with a second communication portion that penetrates the protruding portion in the thickness direction. The second gap communicates with the first gap through the second communication portion. Thereby, the gap between the support plate and the second wall portion can be reduced, thus improving the structural stability of the support mechanism. The second communication portion can effectively connect the first gap and the second gap, and the structure is simple.

[0014] In some embodiments, the length of the second communication portion in the first direction is L, and the width of the second communication portion in the second direction is D. The second direction, the first direction, and the thickness direction are perpendicular to each other in pairs; wherein, L and D satisfy: 0.1 ≤ L / D ≤ 20. Thereby, the shape of the second communication portion can be made more suitable for gas flow, further improving the gas flow capacity inside the housing and the pressure relief effect of the battery cell.

[0015] In some embodiments, the protruding portion includes a first sub-portion and a second sub-portion respectively located on opposite sides of the second communication portion in the second direction. The second direction, the first direction, and the thickness direction are perpendicular to each other in pairs; the widths of the first sub-portion and the second sub-portion in the second direction are d1 and d2 respectively, and the width of the second communication portion in the second direction is D; wherein, D and d1 satisfy: 0.2 ≤ D / d1 ≤ 20; and / or, D and d2 satisfy: 0.2 ≤ D / d2 ≤ 20. Thereby, a balance can be achieved between the structural strength of the protruding portion and the gas flow capacity of the second communication portion.

[0016] In some embodiments, the electrode assembly includes a main body portion and a tab. The tab is provided at at least one end of the main body portion in the first direction. The first direction intersects the arrangement directions of the support mechanism and the electrode assembly; in the thickness direction of the support plate, the projection of the support assembly is located within the projection of the main body portion. Thereby, most of the force generated by the main body portion on the support mechanism can be transmitted to the support assembly along the thickness direction, reducing the stress on the support plate and decreasing the possibility of deformation or bending of the support plate due to excessive force.

[0017] According to the second aspect of the present application, the present application further provides a battery, which includes a plurality of battery cells provided according to any embodiment of the present application.

[0018] According to the third aspect of the present application, the present application further provides an electrical device, which includes a battery provided according to any embodiment of the present application, and the battery is used to provide electrical energy. Description of the Drawings

[0019] To more clearly illustrate the technical solutions of the embodiments of the present application, the accompanying drawings required for the embodiments of the present application will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0020] Figure 1 It is a schematic structural diagram of a vehicle provided by some embodiments of the present application.

[0021] Figure 2 It is an exploded structural diagram of a battery provided by some embodiments of the present application.

[0022] Figure 3 It is an exploded structural diagram of a battery cell provided by some embodiments of the present application.

[0023] Figure 4 It is a sectional structural diagram of a battery cell provided by some embodiments of the present application.

[0024] Figure 5 It is Figure 4 a schematic structural diagram of the support mechanism of the battery cell shown.

[0025] Figure 6 It is Figure 5 a front view structural diagram of the support mechanism shown.

[0026] Figure 7 It is Figure 5 a top view structural diagram of the support mechanism shown.

[0027] Figure 8 It is a front view structural diagram of the support mechanism of a battery cell provided by some other embodiments of the present application.

[0028] Figure 9 It is Figure 8 a side view structural diagram of the support mechanism shown.

[0029] In the accompanying drawings:

[0030] Vehicle 1000, battery 100, controller 200, motor 300, box body 10, first part 11, second part 12, battery cell 20, housing 21, first wall portion 211, second wall portion 212, housing body 21a, cover plate 21b, electrode assembly 22, main body portion 221, tab 222, electrode terminal 23, pressure relief mechanism 24, support mechanism 25, support plate 251, first communication portion 2511, protruding portion 2512, first sub-portion 2512a, second sub-portion 2512b, second communication portion 2513, support assembly 252, support block 2521, support frame 2522, first support portion 2522a, second support portion 2522b, first gap 261, second gap 262, thickness direction X, first direction Y, second direction Z. Detailed implementation manners

[0031] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application will be clearly described below with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are some, but not all, of the embodiments of this application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this application without creative efforts shall fall within the scope of protection of this application.

[0032] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used in the description of this application in the specification 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, claims, and drawings of this application are intended to cover non-exclusive inclusion. The terms "first", "second", etc. in the specification, claims, or drawings of this application are used to distinguish different objects and are not used to describe a specific order or primary-secondary relationship.

[0033] Referring to "embodiments" in this application means that specific features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of this application. The phrase appears in various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments.

[0034] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "joined", and "attached" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0035] The term "and / or" in the present application is merely an association relationship describing associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in the present application generally represents an "or" relationship between the front and rear associated objects.

[0036] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, in different embodiments, the detailed description of the same components is omitted. It should be understood that the thickness, length, width, and other dimensions of various components shown in the drawings in the embodiments of the present application, as well as the overall thickness, length, width, and other dimensions of the integrated device, are only for illustrative purposes and should not constitute any limitation to the present application.

[0037] The term "a plurality of" appearing in the present application refers to two or more (including two).

[0038] In the embodiments of the present application, "parallel" includes not only the case of absolute parallelism, but also the case of approximately parallelism commonly recognized in engineering; at the same time, "perpendicular" also includes not only the case of absolute perpendicularity, but also the case of approximately perpendicularity commonly recognized in engineering.

[0039] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in the present application can include a battery module or a battery pack, etc. A battery generally includes a box body for encapsulating one or more battery cells. The box body can prevent liquids or other foreign objects from affecting the charging or discharging of the battery cells.

[0040] In some embodiments, the box body can be a part of the chassis structure of a vehicle. For example, a part of the box body can become at least a part of the floor of the vehicle, or a part of the box body can become at least a part of the crossbeam and longitudinal beam of the vehicle.

[0041] In some embodiments, the battery can be an energy storage device. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0042] In the embodiments of the present application, the battery cell may be a secondary battery cell, which refers to a battery cell that can be activated by charging after discharging so as to be used continuously.

[0043] The battery cell may be a lithium-ion battery cell, a sodium-ion battery cell, a sodium-lithium-ion battery cell, a lithium-metal battery cell, a sodium-metal battery cell, a lithium-sulfur battery cell, a magnesium-ion battery cell, a nickel-metal hydride battery cell, a nickel-cadmium battery cell, a lead-acid battery cell, etc., and the embodiments of the present application do not limit this.

[0044] As an example, the battery cell may be a cylindrical battery cell, a prismatic battery cell or a battery cell of other shapes. The prismatic battery cell includes a square-shell battery cell, a blade-shaped battery cell, a multi-prismatic battery, and the multi-prismatic battery is, for example, a hexagonal-prismatic battery, etc., and the present application has no special limitation.

[0045] The battery cell includes an electrode assembly and an electrolyte. The electrode assembly includes a positive electrode tab, a negative electrode tab and a separator. The battery cell mainly operates by the movement of metal ions between the positive electrode tab and the negative electrode tab. The positive electrode tab includes a positive current collector and a positive active material layer, and the positive active material layer is coated on the surface of the positive current collector; the positive current collector includes a positive current collecting part and a positive electrode ear, the positive current collecting part is coated with the positive active material layer, and the positive electrode ear is not coated with the positive active material layer. Taking a lithium-ion battery as an example, the material of the positive current collector may be aluminum, and the positive active material layer includes a positive active material, and the positive active material may be lithium cobaltate, lithium iron phosphate, ternary lithium or lithium manganate, etc. The negative electrode tab includes a negative current collector and a negative active material layer, and the negative active material layer is coated on the surface of the negative current collector; the negative current collector includes a negative current collecting part and a negative electrode ear, the negative current collecting part is coated with the negative active material layer, and the negative electrode ear is not coated with the negative active material layer. The material of the negative current collector may be copper, and the negative active material layer includes a negative active material, and the negative active material may be carbon or silicon, etc. The material of the separator may be PP (polypropylene) or PE (polyethylene), etc.

[0046] The development of battery technology needs to consider various design factors at the same time. For example, performance parameters such as energy density, cycle life, discharge capacity, charge-discharge rate, etc. In addition, the reliability of the battery also needs to be considered.

[0047] The pressure relief mechanism on the battery cell has an important impact on the safety of the battery cell. For example, when phenomena such as short circuit and overcharge occur, it may cause thermal runaway inside the battery cell and thus a sudden increase in pressure. In this case, the internal pressure can be released outward through the actuation of the pressure relief mechanism to prevent the battery cell from exploding and catching fire.

[0048] The pressure relief mechanism can be an element or component that actuates when certain conditions of the battery cell are met. Exemplarily, the pressure relief mechanism can be an element or component that actuates to release the internal pressure and / or internal substances when the internal pressure or internal temperature of the battery cell reaches a predetermined threshold. This threshold design varies according to different design requirements. This threshold may depend on the materials of one or several of the positive electrode tab, negative electrode tab, electrolyte, and separator in the battery cell.

[0049] The pressure relief mechanism can be in the form of, for example, an explosion-proof valve, a gas valve, a pressure relief valve, or a safety valve, and can specifically adopt a pressure-sensitive element or structure, that is, when the internal pressure of the battery cell reaches a predetermined threshold, the pressure relief mechanism performs an action or a weak area provided in the pressure relief mechanism ruptures, thereby forming an opening or channel for the internal pressure to be released. Alternatively, the pressure relief mechanism can also adopt a temperature-sensitive element or structure, that is, when the internal temperature of the battery cell reaches a predetermined threshold, the pressure relief mechanism performs an action, thereby forming an opening or channel for the internal pressure to be released. Alternatively, the pressure relief mechanism can also be a component capable of active actuation. Exemplarily, the pressure relief mechanism can be actuated when receiving a control signal of the battery.

[0050] The "actuation" mentioned in this application refers to the pressure relief mechanism generating an action or being activated to a certain state, so that the internal pressure of the battery cell can be released. The actions generated by the pressure relief mechanism can include, but are not limited to: at least a part of the pressure relief mechanism rupturing, breaking, being torn, or opening, etc. When the pressure relief mechanism is actuated, the high-temperature and high-pressure substances inside the battery cell will be discharged outward from the actuated part as emissions. In this way, the battery cell can be depressurized under a controllable pressure, thus avoiding potential more serious accidents.

[0051] The emissions from the battery cell mentioned in this application include, but are not limited to: electrolyte, dissolved or split positive and negative electrode tabs, fragments of the separator, high-temperature and high-pressure gases generated by the reaction, flames, etc.

[0052] Currently, a support plate is provided between the outer shell and the electrode assembly of some battery cells, and the support plate mainly plays a supporting role for the electrode assembly. However, the side of the housing where the pressure relief mechanism is located is closely arranged with the support plate, and the gas cannot reach the position of the pressure relief mechanism smoothly, and the exhaust capacity is limited. When a large amount of heat and steam are generated inside the battery cell, the battery cell is at risk of damage and explosion of the outer shell due to poor pressure relief, reducing the reliability of the battery.

[0053] In view of this, an embodiment of the present application provides a technical solution. By providing a support mechanism between the electrode assembly and the first wall portion of the housing provided with a pressure relief mechanism, a first gap is formed between the support plate of the support mechanism and the first wall portion, and at least a part of the pressure relief mechanism is exposed to the first gap. When a large amount of heat and steam are generated in the electrode assembly due to reasons such as thermal runaway and failure, the first gap can serve as an exhaust passage, enabling the heat and steam generated by the electrode assembly to act on the pressure relief mechanism in a timely manner, thereby effectively relieving pressure through the pressure relief mechanism, reducing the safety hazard of explosion caused by poor pressure relief of the electrode assembly, and improving the reliability of the battery cell.

[0054] The battery cell described in the embodiments of the present application is applicable to batteries and electrical devices using batteries.

[0055] The battery cell, battery, and electrical device disclosed in the embodiments of the present application can be used in electrical devices using batteries as power sources or various energy storage systems using batteries as energy storage elements. The electrical device can be, but is not limited to, mobile phones, tablets, laptop computers, electric toys, power tools, battery cars, electric vehicles, ships, spacecraft, etc. Among them, electric toys can include stationary or mobile electric toys, such as game consoles, electric vehicle toys, electric ship toys, and electric plane toys, etc., and spacecraft can include airplanes, rockets, space shuttles, and spaceships, etc.

[0056] For the convenience of description in the following embodiments, a vehicle 1000 as an electrical device in an embodiment of the present application is taken as an example for description.

[0057] Figure 1 is a schematic structural diagram of a vehicle provided in some embodiments of the present application. Referring to Figure 1 , the vehicle 1000 can be a fuel vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle, or an extended-range electric vehicle, etc. A battery 100 is provided inside the vehicle 1000, and the battery 100 can be provided at the bottom, head, or tail of the vehicle 1000. The battery 100 can be used for power supply of the vehicle 1000. For example, the battery 100 can be used as the operating power source of the vehicle 1000. The vehicle 1000 can further include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to supply power to the motor 300. For example, it is used for the working power requirements during the start, navigation, and driving of the vehicle 1000.

[0058] In some embodiments of the present application, the battery 100 can not only be used as the operating power source of the vehicle 1000, but also be used as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0059] Figure 2This is a schematic exploded view of a battery provided by some embodiments of the present application. Referring to Figure 2 In the battery 100 provided by the embodiments of the present application, the battery 100 includes a box body 10 and battery cells 20, and the battery cells 20 are accommodated in the box body 10. Among them, the box body 10 is used to provide an accommodation space for the battery cells 20, and the box body 10 can adopt various structures. In some embodiments, the box body 10 may include a first part 11 and a second part 12, the first part 11 and the second part 12 cover each other, and the first part 11 and the second part 12 jointly define an accommodation space for accommodating the battery cells 20. The second part 12 may be a hollow structure with one end open, and the first part 11 may be a plate-like structure. The first part 11 covers the open side of the second part 12 so that the first part 11 and the second part 12 jointly define an accommodation space; the first part 11 and the second part 12 may also both be hollow structures with one side open, and the open side of the first part 11 covers the open side of the second part 12. Of course, the box body 10 formed by the first part 11 and the second part 12 can be of various shapes, such as a cylinder, a cuboid, etc.

[0060] To improve the sealing performance after the connection between the first part 11 and the second part 12, a sealing member, such as sealant, sealing ring, etc., may also be provided between the first part 11 and the second part 12.

[0061] Assuming that the first part 11 covers the top of the second part 12, the first part 11 may also be referred to as the upper box cover, and the second part 12 may also be referred to as the lower box body.

[0062] In the battery 100, there may be multiple battery cells 20, and the multiple battery cells 20 may be connected in series, in parallel, or in a hybrid connection. A hybrid connection means that there are both series and parallel connections among the multiple battery cells 20. The multiple battery cells 20 may be directly connected in series, in parallel, or in a hybrid connection together, and then the whole formed by the multiple battery cells 20 is accommodated in the box body 10; of course, the battery 100 may also be in the form that multiple battery cells 20 are first connected in series, in parallel, or in a hybrid connection to form battery modules, and then the multiple battery modules are connected in series, in parallel, or in a hybrid connection to form a whole and are accommodated in the box body 10. The battery 100 may also include other structures. For example, the battery 100 may further include a busbar component for realizing the electrical connection between the multiple battery cells 20.

[0063] Among them, each battery cell 20 may be a secondary battery or a primary battery; it may also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 20 may be in the shape of a cylinder, a flat body, a cuboid, or other shapes, etc.

[0064] Figure 3 This is a schematic exploded view of a battery cell provided by some embodiments of the present application. Referring to Figure 3, the battery cell 20 includes a housing 21 and an electrode assembly 22, and the electrode assembly 22 is disposed inside the housing 21.

[0065] The housing 21 has a hollow structure, and an accommodation space for accommodating the electrode assembly 22 and the electrolyte is formed inside it. The shape of the housing 21 can be determined according to the specific shape of the electrode assembly 22. For example, if the electrode assembly 22 has a cuboid structure, a cuboid housing can be selected.

[0066] The material of the housing 21 can be various. For example, the material of the housing 21 can be metal or plastic. Optionally, the material of the housing 21 can be copper, iron, aluminum, steel, aluminum alloy, etc. Exemplarily, the housing 21 can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite housing), or an aluminum plastic film, etc.

[0067] The electrode assembly 22 includes a positive electrode plate and a negative electrode plate. Exemplarily, the electrode assembly 22 generates electric energy through the oxidation and reduction reactions during the insertion / extraction of ions in the positive electrode plate and the negative electrode plate. Optionally, the electrode assembly 22 further includes a separator for insulating and isolating the positive electrode plate and the negative electrode plate.

[0068] The electrode assembly 22 can be a wound electrode assembly, a stacked electrode assembly, or other types of electrode assemblies.

[0069] The electrode assembly 22 can be one or multiple. When there are multiple electrode assemblies 22, the multiple electrode assemblies 22 can be arranged in layers.

[0070] As an example, the housing 21 includes a housing body 21a and a cover plate 21b. The housing body 21a has an opening, and the cover plate 21b is used to cover the opening.

[0071] The housing body 21a is a component for cooperating with the cover plate 21b to form the internal cavity of the battery cell 20. The formed internal cavity can be used to accommodate the electrode assembly 22, the electrolyte, and other components.

[0072] The housing body 21a and the cover plate 21b can be independent components. Exemplarily, an opening can be provided on the housing body 21a, and the cover plate 21b is covered at the opening to form the internal cavity of the battery cell 20.

[0073] The shape of the cover plate 21b can be adapted to the shape of the housing body 21a to cooperate with the housing body 21a. The material of the cover plate 21b can be the same as or different from the material of the housing body 21a.

[0074] The cover plate 21b can be connected to the housing body 21a by welding, bonding, clamping, or other means.

[0075] In some embodiments, refer to Figure 3The battery cell 20 includes a shell 21 and an electrode assembly 22 , and the electrode assembly 22 is disposed in the shell 21 .

[0076] In some embodiments, the battery cell 20 further includes an electrode terminal 23 , which can be used to electrically connect to the electrode assembly 22 to output electrical energy from the battery cell 20 or input electrical energy into the battery cell 20 .

[0077] In some embodiments, the electrode terminals 23 are disposed on the cover plate 21b. For example, the housing 21a may also be open on both sides. The battery cell 20 includes two cover plates 21b and two electrode terminals 23. The two electrode terminals 23 are respectively mounted on the two cover plates 21b and are electrically connected to the positive electrode sheet and the negative electrode sheet, respectively.

[0078] In some embodiments, the battery cell 20 further includes a pressure relief mechanism 24 disposed on the housing 21. For example, the pressure relief mechanism 24 may be disposed on the cover plate 21b or on the housing 21a.

[0079] Figure 4 is a schematic cross-sectional structural diagram of a battery cell provided in some embodiments of the present application, Figure 5 yes Figure 4 The structural diagram of the supporting mechanism of the battery cell shown in FIG. Figure 6 yes Figure 5 The front view structural diagram of the support mechanism shown in FIG. Figure 7 yes Figure 5 The top view of the support mechanism is shown in FIG. Figures 4 to 7 The battery cell 20 provided in the embodiment of the present application includes a shell 21, an electrode assembly 22, a pressure relief mechanism 24 and a support mechanism 25. The shell 21 includes a first wall portion 211. The pressure relief mechanism 24 is arranged in the first wall portion 211. The electrode assembly 22 is arranged in the shell 21. The support mechanism 25 is arranged between the electrode assembly 22 and the first wall portion 211, and is used to support the electrode assembly 22. The support mechanism 25 includes a support plate 251 and a support assembly 252. The support assembly 252 is arranged between the support plate 251 and the first wall portion 211, and forms a first gap 261 between the support plate 251 and the first wall portion 211. At least part of the pressure relief mechanism 24 is exposed to the first gap 261.

[0080] The electrode assembly 22 is disposed on a side of the support plate 251 away from the first wall portion 211 . The first gap 261 communicates with the space on the side of the support mechanism 25 facing the electrode assembly 22 , so that at least a portion of the pressure relief mechanism 24 is exposed to the first gap 261 .

[0081] As an example, the first wall portion 211 may be the cover plate 21 b or a wall of the housing 21 a .

[0082] As an example, the shape of the first wall portion 211 can be circular, rectangular, oval or other shapes.

[0083] In some examples, the pressure relief mechanism 24 and the housing 21 are independently formed components, and the two can be connected by welding, bonding or other means. For example, a pressure relief hole is provided on the housing 21, the pressure relief hole penetrates through the housing 21, the pressure relief mechanism 24 is installed on the housing 21 and covers the pressure relief hole to separate the spaces on both sides of the housing 21 inside and outside. In an alternative embodiment, the pressure relief mechanism 24 and the housing 21 can also be an integrally formed structure.

[0084] The support mechanism 25 is provided on the side of the electrode assembly 22 facing the pressure relief mechanism 24. Exemplarily, the first wall portion 211 where the pressure relief mechanism 24 is located can be the bottom wall of the housing 21, and the support mechanism 25 is provided on the lower side of the electrode assembly 22 to support the electrode assembly 22 upward. Alternatively, the first wall portion 211 where the pressure relief mechanism 24 is located can also be other side walls of the housing 21.

[0085] The support mechanism 25 is provided on the side of the first wall portion 211 facing the electrode assembly 22. Exemplarily, the first wall portion 211 can be the bottom wall of the housing 21, and the support mechanism 25 is supported on the first wall portion 211.

[0086] A first gap 261 is formed between the support plate 251 and the first wall portion 211, that is, the first gap 261 is located between at least part of the structure of the support plate 251 and at least part of the structure of the first wall portion 211. Exemplarily, the support plate 251 can be spaced from the first wall portion 211 by the support of the support assembly 252, thereby forming a first gap 261 between the support plate 251 and the first wall portion 211.

[0087] The pressure relief mechanism 24 can be wholly exposed to the first gap 261, or only a part of the pressure relief mechanism 24 can be exposed to the first gap 261, as long as the gas pressure from the first gap 261 can act on the pressure relief mechanism 24.

[0088] A part of the electrode assembly 22 facing the support mechanism 25 is located in the space on the side of the support mechanism 25 facing the electrode assembly 22, and this space is communicated with the first gap 261. Therefore, a part of the electrode assembly 22 facing the support mechanism 25 is exposed to the first gap 261.

[0089] The support mechanism 25 and the electrode assembly 22, as well as the support mechanism 25 and the first wall portion 211, can be connected together by suitable means such as abutting, bonding, welding, etc.

[0090] The material of the support mechanism 25 can be a polymer material, a glass fiber - resin reinforced material, a ceramic, a metal, a ceramic - fiber composite, a mica sheet composite material, etc.

[0091] A part of the electrode assembly 22 facing the support mechanism 25 and at least part of the pressure relief mechanism 24 are both exposed to the first gap 261, and the first gap 261 can communicate the electrode assembly 22 and the pressure relief mechanism 24. When a large amount of heat and steam are generated in the electrode assembly 22 due to thermal runaway, failure, etc., the first gap 261 can serve as an exhaust passage, enabling the heat and steam generated by the electrode assembly 22 to act on the pressure relief mechanism 24 in a timely manner, thereby discharging pressure in a timely and effective manner through the pressure relief mechanism 24, reducing the safety hazard of explosion of the battery cell 20 caused by unsmooth pressure relief, and improving the reliability of the battery cell 20.

[0092] It can be understood that the electrode assembly 22, the support mechanism 25, and the first wall portion 211 are arranged along the thickness direction X of the support plate 251. The arrangement direction of the electrode assembly 22 and the support mechanism 25 is the thickness direction X of the support plate 251. Exemplarily, the first wall portion 211 can be the bottom wall of the housing 21, the thickness direction X is vertical, and the electrode assembly 22 is supported on the support plate 251.

[0093] The support plate 251 can be a flat plate-like structure, providing more stable support.

[0094] Optionally, in the thickness direction X, the projection of the support assembly 252 and the projection of the pressure relief mechanism 24 do not overlap, the support assembly 252 does not cover the pressure relief mechanism 24, and the entire pressure relief mechanism 24 is exposed to the first gap 261.

[0095] The support assembly 252 is disposed between the support plate 251 and the first wall portion 211. The support assembly 252 can space apart the support plate 251 and the first wall portion 211 along the thickness direction X, thereby forming the first gap 261 between the support plate 251 and the first wall portion 211.

[0096] The materials of the support plate 251 and the support assembly 252 can be the same or different.

[0097] The support plate 251 and the support assembly 252 can be integrally formed or connected together by suitable means such as bonding, welding, hot melting, riveting, and clamping.

[0098] In the embodiment of the present application, by providing the support plate 251, the contact area with the electrode assembly 22 can be increased, thereby improving the support stability of the electrode assembly 22; by providing the support assembly 252, the entire support plate 251 can be separated from the first wall portion 211 to form the first gap 261, increasing the area of the first gap 261, and improving the exhaust efficiency of the first gap 261 and the pressure relief efficiency of the battery cell 20.

[0099] In some embodiments, refer to Figure 5 and Figure 7, the support plate 251 is provided with a first communication part 2511. The first communication part 2511 penetrates through the support plate 251 along the thickness direction X of the support plate 251, and the first communication part 2511 communicates with the first gap 261.

[0100] The first communication part 2511 penetrates through the support plate 251, and the first communication part 2511 can be structures such as through holes and through grooves.

[0101] The shape of the first communication part 2511 can be regular shapes such as circular, square, and oval, or can be an irregular shape.

[0102] The space on the side of the support mechanism 25 facing the electrode assembly 22 can be communicated with the first gap 261 through the first communication part 2511. In the thickness direction X, the part of the electrode assembly 22 facing the support mechanism 25 and opposite to the first communication part 2511 is exposed to the first gap 261 through the first communication part 2511.

[0103] The number of the first communication parts 2511 can be one or multiple.

[0104] In the embodiment of the present application, by providing the first communication part 2511 on the support plate 251, the communication between the first gap 261 and the space on the side of the support mechanism 25 facing the electrode assembly 22 is realized with a very simple structure; and other structures of the support plate 251 except the first communication part 2511 can be used to support the electrode assembly 22, ensuring the support strength of the support plate 251.

[0105] In some embodiments, in the thickness direction X, at least part of the first communication part 2511 is disposed opposite to the pressure relief mechanism 24.

[0106] In other words, in the thickness direction X, at least part of the projection of the first communication part 2511 and the projection of the pressure relief mechanism 24 overlap. Optionally, the projection area of the first communication part 2511 can be larger than the projection area of the pressure relief mechanism 24, and the projection of the pressure relief mechanism 24 is located in the projection of the first communication part 2511.

[0107] In the embodiment of the present application, at least part of the first communication part 2511 is disposed opposite to the pressure relief mechanism 24, and at least part of the steam generated by the electrode assembly 22 can directly flow to the pressure relief mechanism 24 through the first communication part 2511, reducing gas commutation and shortening the gas flow path, thereby further improving the pressure relief efficiency. [[ID=W25]]

[0108] In some embodiments, referring to Figure 5 and Figure 6, the support assembly 252 includes a plurality of support blocks 2521. The plurality of support blocks 2521 are arranged in pairs and spaced apart from each other along the second direction Z. The second direction Z intersects with the thickness direction X of the support plate 251, and each support block 2521 is connected to the support plate 251.

[0109] Optionally, the plurality of support blocks 2521 are disposed at the edge portion of the support plate 251 to reduce the blocking effect of the support blocks 2521 on the gas. Exemplarily, the number of the support blocks 2521 can be four, and the four support blocks 2521 can be respectively disposed at the four corner portions of the support plate 251.

[0110] The support block 2521 can be cylindrical, prismatic or other suitable shapes.

[0111] The support area of the support block 2521 is relatively large, which is beneficial to improving the support stability. The two support blocks 2521 spaced apart along the second direction Z can respectively support both sides of the support plate 251 along the second direction Z, improving the support balance. Moreover, the gap between the two support blocks 2521 spaced apart can form a part of the first gap 261, which can communicate with the second gap 262 formed between the side of the electrode assembly 22 provided with the tab and the housing 21, enhancing the gas circulation ability in the housing 21 and improving the pressure relief effect.

[0112] Figure 8 is a front view structural schematic diagram of the support mechanism of the battery cell provided by other embodiments of the present application. Figure 9 is Figure 8 a side view structural schematic diagram of the shown support mechanism. In some embodiments, referring to Figure 8 and Figure 9 , the support assembly 252 includes a plurality of support frames 2522 spaced apart along the first direction Y. The support frame 2522 includes at least two first support portions 2522a and at least two second support portions 2522b. The at least two first support portions 2522a are sequentially spaced apart along the second direction Z. The first direction Y, the second direction Z and the thickness direction X of the support plate 251 are perpendicular to each other in pairs. The first support portion 2522a extends along the thickness direction X. One end of the first support portion 2522a is connected to the support plate 251. Two second support portions 2522b are provided between adjacent first support portions 2522a. The second support portion 2522b is inclined with respect to the first support portion 2522a. One end of the two second support portions 2522b close to the support plate 251 is connected to the support plate 251, and the other ends of the two second support portions 2522b away from the support plate 251 are respectively connected to the adjacent first support portions 2522a.

[0113] Optionally, the adjacent support frames 2522 are arranged at equal intervals so that the plurality of support frames 2522 can evenly support the support plate 251 in the first direction Y.

[0114] Exemplarily, the number of the first support portions 2522a and the second support portions 2522b can both be two. The two first support portions 2522a are respectively disposed on both sides of the support plate 251 along the second direction Z, and the two second support portions 2522b are disposed between the two first support portions 2522a. As another example, the number of the first support portions 2522a and the second support portions 2522b can also be more. For example, the number of the first support portions 2522a is three, and the number of the second support portions 2522b is four. Two second support portions 2522b are provided between any two adjacent first support portions 2522a.

[0115] Both the first support portions 2522a and the second support portions 2522b can be strip-shaped or rod-shaped structures to reduce their occupied space and reduce the mass of the support frame 2522.

[0116] One end of the first support portion 2522a connected to the support plate 251 and one end of the second support portion 2522b connected to the support plate 251 can be connected to each other or can be independent of each other.

[0117] The first support portions 2522a extend along the thickness direction X, the second support portions 2522b are inclined with respect to the first support portions 2522a, and the first support portions 2522a, the second support portions 2522b and the support plate 251 enclose a triangular space structure, making the support more stable. Moreover, this triangular space can form a part of the first gap 261, which can communicate with the second gap 262 formed between the side of the electrode assembly 22 where the tab is provided and the housing 21, enhancing the gas flow capacity inside the housing 21 and improving the pressure relief effect.

[0118] In some embodiments, referring to Figure 6 , the thickness of the support plate 251 is H1, and the height of the support assembly 252 along the thickness direction X is H2. H1 and H2 satisfy: 0.1 ≤ H2 / H1 ≤ 10.

[0119] Exemplarily, the ratio between H2 and H1 can be 0.1, 0.5, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, 6.0, 6.5, 7.0, 7.5, 8.0, 8.5, 9.0, 9.5 or 10, etc.

[0120] If the ratio of the height H2 of the support component 252 to the thickness H1 of the support plate 251 is too large, the thickness of the support plate 251 is too thin, the structural strength is small, and it is easy to break or crack. If the ratio of the height H2 of the support component 252 to the thickness H1 of the support plate 251 is too small, not only is the thickness of the support plate 251 relatively thicker, the weight is heavier, which will significantly increase the mass of the battery cell 20, but also the height of the first gap 261 is relatively small, which is not conducive to the rapid flow of gas and affects the pressure relief effect.

[0121] Therefore, in the embodiments of the present application, the ratio of the height H2 of the support component 252 to the thickness H1 of the support plate 251 is set between 0.1 and 10, so as to achieve a balance among the structural strength of the support mechanism 25, the weight of the battery cell 20, and the pressure relief effect.

[0122] In some embodiments, the support plate 251 and the support component 252 are of an integrally formed structure.

[0123] Optionally, the support component 252 includes a plurality of support blocks 2521, and the plurality of support blocks 2521 are integrally formed with the support plate 251.

[0124] Optionally, the support component 252 includes a plurality of support frames 2522 spaced apart along the first direction Y, and the plurality of support frames 2522 are integrally formed with the support plate 251.

[0125] The support plate 251 and the support component 252 can be integrally formed by an injection molding process or other suitable processes.

[0126] In the embodiments of the present application, the support plate 251 and the support component 252 are set to be of an integrally formed structure, which simplifies the process and the structure.

[0127] In some embodiments, referring to Figure 4 , the electrode assembly 22 includes a main body portion 221 and a tab 222. The tab 222 is provided at at least one end of the main body portion 221 along the first direction Y, and the first direction Y intersects with the arrangement direction of the support mechanism 25 and the electrode assembly 22. The housing 21 includes a second wall portion 212, and the second wall portion 212 is provided on the side of the tab 222 away from the main body portion 221. A second gap 262 is formed between the main body portion 221 and the second wall portion 212, and the second gap 262 communicates with the first gap 261.

[0128] The arrangement direction of the support mechanism 25 and the electrode assembly 22 can be the thickness direction X of the support plate 251.

[0129] The tab 222 and the pressure relief mechanism 24 are on different side portions of the main body portion 221. Due to the presence of the tab 222, a second gap 262 is formed between the main body portion 221 on the side where the tab 222 is located and the housing 21.

[0130] Exemplarily, the first wall portion 211 may be the bottom wall of the outer shell 21, and the second wall portion 212 may be the side wall of the outer shell 21.

[0131] The number of the tabs 222 may be at least two, where at least one tab 222 is a positive tab and at least one other tab 222 is a negative tab.

[0132] Optionally, each tab 222 may be located at the same end of the main body portion 221 along the first direction Y. At this time, a second gap 262 is formed between the main body portion 221 and a second wall portion 212 of the outer shell 21. Optionally, at least two tabs 222 may also be respectively located at opposite ends of the main body portion 221 along the first direction Y. The outer shell 21 may include two second wall portions 212 arranged oppositely along the first direction Y, and a second gap 262 is formed between each second wall portion 212 and the main body portion 221.

[0133] The first gap 261 and the second gap 262 may be directly connected or indirectly connected through a connection space. Exemplarily, the end portion of the support plate 251 along the first direction Y may be spaced from the second wall portion 212, and the first gap 261 and the second gap 262 are connected through the space between the support plate 251 and the second wall portion 212.

[0134] In the embodiment of the present application, the second gap 262 is communicated with the first gap 261, enhancing the gas circulation ability in the outer shell 21. The gas pressure in the second gap 262 can act on the pressure relief mechanism through the first gap 261, improving the pressure relief effect.

[0135] In some embodiments, referring to Figure 5 , the support plate 251 includes a protruding portion 2512 protruding from the main body portion 221 along the first direction Y. The protruding portion 2512 is provided with a second communication portion 2513. The second communication portion 2513 penetrates through the protruding portion 2512 along the thickness direction X, and the second gap 262 is communicated with the first gap 261 through the second communication portion 2513.

[0136] The dimension of the support plate 251 along the first direction Y is greater than the dimension of the main body portion 221 along the first direction Y, so that a part of the support plate 251 protrudes from the main body portion 221 along the first direction Y to form the protruding portion 2512.

[0137] The electrode assembly 22 is supported on other parts of the support plate 251 except the protruding portion 2512.

[0138] In the thickness direction X, the projection of the main body portion 221 and the projection of the protruding portion 2512 do not overlap.

[0139] The protruding portion 2512 may abut against the second wall portion 212 to reduce the shaking of the support mechanism 25 in the outer shell 21.

[0140] The number of the protruding portions 2512 may be one or two. When there are two protruding portions 2512, the two protruding portions 2512 respectively protrude from both ends of the main body portion 221 along the first direction Y.

[0141] The second communication portion 2513 may be a through hole or a through groove. Exemplarily, the second communication portion 2513 may be formed as a through groove at the end of the protruding portion 2512. Thus, even when the dimension of the protruding portion 2512 along the first direction Y is small, the first gap 261 and the second gap 262 can be communicated through the second communication portion 2513.

[0142] In the embodiment of the present application, by providing the protruding portion 2512, the gap between the support plate 251 and the second wall portion 212 can be reduced, thereby improving the structural stability of the support mechanism 25 in the housing 21. The protruding portion 2512 is not covered by the main body portion 221. Therefore, the second communication portion 2513 formed on the protruding portion 2512 is not covered by the main body portion 221 either. The second communication portion 2513 penetrates through the protruding portion 2512, and can effectively communicate the first gap 261 and the second gap 262, with a simple structure.

[0143] In some embodiments, referring to Figure 6 , the length of the second communication portion 2513 along the first direction Y is L, the width of the second communication portion 2513 along the second direction Z is D, and the second direction Z, the first direction Y, and the thickness direction X are perpendicular to each other in pairs. Wherein, L and D satisfy: 0.1 ≤ L / D ≤ 20.

[0144] Exemplarily, the ratio between L and D may be 0.1, 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, or 20, etc.

[0145] Restricted by the dimensions of the housing 21 along the first direction Y and the second direction Z, neither the length L of the second communication portion 2513 along the first direction Y nor the width D along the second direction Z will be too large. Whether the ratio of the length L of the second communication portion 2513 along the first direction Y to its width D along the second direction Z is too small, or the ratio of the length L of the second communication portion 2513 along the first direction Y to its width D along the second direction Z is too large, the second communication portion 2513 is approximately a slit, and the gas flow capacity is relatively small.

[0146] Therefore, in the embodiment of the present application, the ratio of the length L of the second communication portion 2513 along the first direction Y to its width D along the second direction Z is set between 0.1 and 20, which can make the shape of the second communication portion 2513 more suitable for gas flow, and further improve the gas flow capacity in the housing 21 and the pressure relief effect of the battery cell 20.

[0147] In some embodiments, reference Figure 7 The extension portion 2512 includes a first sub-portion 2512a and a second sub-portion 2512b located on opposite sides of the second connecting portion 2513 along the second direction Z. The second direction Z, the first direction Y, and the thickness direction X are perpendicular to each other. The widths of the first sub-portion 2512a and the second sub-portion 2512b along the second direction Z are d1 and d2, respectively. The width of the second connecting portion 2513 along the second direction Z is D. Where D and d1 satisfy the following: 0.2 ≤ D / d1 ≤ 20; and / or D and d2 satisfy the following: 0.2 ≤ D / d2 ≤ 20.

[0148] In the second direction Z, the second communication portion 2513 is formed in the middle of the protruding portion 2512 .

[0149] The widths of the first sub-portion 2512a and the second sub-portion 2512b along the second direction Z may be the same or different.

[0150] Exemplarily, the width of the first sub-portion 2512a and the second sub-portion 2512b along the second direction Z can be 0.2, 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19 or 20, etc.

[0151] If the ratio of the width D of the second connecting portion 2513 along the second direction Z to the width d1 of the first sub-portion 2512a along the second direction Z is too large, the width of the first sub-portion 2512a will be small, the structural strength will be low, and it will be easily broken. If the ratio of the width D of the second connecting portion 2513 along the second direction Z to the width d1 of the first sub-portion 2512a along the second direction Z is too small, the width of the second connecting portion 2513 will be too small, and it may be similar to a gap, resulting in poor gas flow capacity.

[0152] To this end, in the embodiment of the present application, the ratio of the width D of the second connecting portion 2513 along the second direction Z to the width d1 of the first sub-portion 2512a along the second direction Z is set between 0.2 and 20, so as to achieve a balance between the structural strength of the protruding portion 2512 and the gas flow capacity of the second connecting portion 2513.

[0153] It is understandable that the above analysis and technical effects of the ratio of the width D of the second connecting portion 2513 along the second direction Z to the width d1 of the first sub-portion 2512a along the second direction Z are also applicable to the second sub-portion 2512b, and therefore are not repeated here.

[0154] In some embodiments, reference Figure 4, the electrode assembly 22 includes a main body portion 221 and an electrode tab 222. The electrode tab 222 is provided at at least one end of the main body portion 221 along the first direction Y, and the first direction Y intersects with the arrangement direction of the support mechanism 25 and the electrode assembly 22. In the thickness direction X, the projection of the support assembly 252 is located within the projection of the main body portion 221.

[0155] The arrangement direction of the support mechanism 25 and the electrode assembly 22 may be the thickness direction X of the support plate 251.

[0156] The electrode assembly 22 and the support mechanism 25 are arranged along the thickness direction X of the support plate 251, and the force generated by the main body portion 221 on the support mechanism 25 is substantially along the thickness direction X. In the embodiment of the present application, the projection of the support assembly 252 in the thickness direction X is set to be located within the projection of the main body portion 221, so that most of the force generated by the main body portion 221 on the support mechanism 25 can be transmitted to the support assembly 252 along the thickness direction X, reducing the stress on the support plate 251 and reducing the possibility of deformation or bending of the support plate 251 due to excessive force.

[0157] According to the second aspect of the present application, the present application further provides a battery 100, which includes a plurality of battery cells 20 provided in any embodiment of the present application.

[0158] According to the third aspect of the present application, the present application further provides an electrical device, which includes a battery provided in any embodiment of the present application, and the battery is used to provide electrical energy.

[0159] An embodiment of the present application provides a battery cell 20, which includes a housing 21, an electrode assembly 22, a pressure relief mechanism 24, and a support mechanism 25. The housing 21 includes a first wall portion 211. The pressure relief mechanism 24 is disposed in the first wall portion 211. The electrode assembly 22 is disposed within the housing 21. The support mechanism 25 is disposed between the electrode assembly 22 and the first wall portion 211 and is used to support the electrode assembly 22. The support mechanism 25 includes a support plate 251 and a support assembly 252. The electrode assembly 22 is disposed on a side of the support plate 251 facing away from the first wall portion 211. The support assembly 252 is disposed between the support plate 251 and the first wall portion 211, forming a first gap 261 between the support plate 251 and the first wall portion 211. The support plate 251 is provided with a first connecting portion 2511. The first gap 261 is connected to a space on the side of the support mechanism 25 facing the electrode assembly 22 through the first connecting portion 2511. The pressure relief mechanism 24 is exposed to the first gap 261. The electrode assembly 22 includes a main body 221 and a tab 222. The tab 222 is disposed at at least one end of the main body 221 along the first direction Y. The housing 21 includes a second wall 212 disposed on a side of the tab 222 facing away from the main body 221. A second gap 262 is formed between the main body 221 and the second wall 212. The support plate 251 includes an extension 2512 that protrudes from the main body 221 along the first direction Y. The extension 2512 is provided with a second connecting portion 2513. The second gap 262 is connected to the first gap 261 through the second connecting portion 2513.

[0160] Optionally, the support assembly 252 includes a plurality of support blocks 2521, which are arranged in pairs opposite to each other and spaced apart along the second direction Z. Optionally, the support assembly 252 includes a plurality of support frames 2522 spaced apart along the first direction Y, the support frames 2522 including at least two first support portions 2522a and at least two second support portions 2522b, wherein the at least two first support portions 2522a are spaced apart in sequence along the second direction Z. One end of the first support portion 2522a is connected to the support plate 251, two second support portions 2522b are provided between adjacent first support portions 2522a, and the second support portions 2522b are arranged obliquely relative to the first support portions 2522a, with the ends of the two second support portions 2522b close to the support plate 251 being connected to the support plate 251, and the ends of the two second support portions 2522b away from the support plate 251 being connected to adjacent first support portions 2522a.

[0161] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than limiting them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the various embodiments of the present application, and they should all be covered within the scope of the claims and the specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, 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 portion; a pressure relief mechanism, provided on the first wall portion; an electrode assembly, disposed in the housing; as well as A support mechanism is arranged between the electrode assembly and the first wall portion and is used to support the electrode assembly. The support mechanism includes a support plate and a support assembly. The support assembly is arranged between the support plate and the first wall portion and forms a first gap between the support plate and the first wall portion. At least part of the pressure relief mechanism is exposed to the first gap.

2. The battery cell according to claim 1, wherein: The support plate is provided with a first communicating portion, the first communicating portion passes through the support plate along a thickness direction of the support plate, and the first communicating portion is communicated with the first gap.

3. The battery cell according to claim 2, characterized in that: In the thickness direction, at least a portion of the first communicating portion is disposed opposite to the pressure relief mechanism.

4. The battery cell according to claim 1, wherein: The support assembly includes a plurality of support blocks, which are arranged in pairs opposite to each other and spaced apart along a second direction. The second direction intersects with the thickness direction of the support plate, and each of the support blocks is connected to the support plate.

5. The battery cell according to claim 1, characterized in that The support assembly includes a plurality of support frames spaced apart along a first direction, the support frames including at least two first support portions and at least two second support portions, the at least two first support portions being sequentially spaced apart along a second direction, and the first direction, the second direction, and the thickness direction of the support plate being perpendicular to each other; The first support portion extends along the thickness direction, one end of the first support portion is connected to the support plate, two second support portions are provided between adjacent first support portions, the second support portions are inclined relative to the first support portion, one end of the two second support portions close to the support plate is connected to the support plate, and one end of the two second support portions away from the support plate is respectively connected to adjacent first support portions.

6. The battery cell according to claim 1, characterized in that The thickness of the support plate is H1, the height of the support assembly along the thickness direction of the support plate is H2, and H1 and H2 satisfy: 0.1≤H2 / H1≤10.

7. The battery cell according to claim 1, characterized in that The support plate and the support assembly are an integrally formed structure.

8. The battery cell according to claim 1, wherein: The electrode assembly includes a main body and a tab, wherein the tab is provided at least at one end of the main body along a first direction intersecting with an arrangement direction of the support mechanism and the electrode assembly; The housing includes a second wall portion, which is provided on a side of the tab away from the main body portion. A second gap is formed between the main body portion and the second wall portion, and the second gap is connected to the first gap.

9. The battery cell according to claim 8, characterized in that The support plate includes an extension portion protruding from the main body portion along the first direction. The extension portion is provided with a second communication portion that penetrates the extension portion in the thickness direction of the support plate. The second gap communicates with the first gap through the second communication portion.

10. The battery cell according to claim 9, wherein The length of the second communication portion along the first direction is L, and the width of the second communication portion along the second direction is D. The second direction, the first direction, and the thickness direction are perpendicular to each other in pairs; wherein, L and D satisfy: 0.1 ≤ L / D ≤ 20.

11. The battery cell according to claim 9, wherein The extension portion includes a first sub-portion and a second sub-portion respectively located on opposite sides of the second communication portion along the second direction. The second direction, the first direction, and the thickness direction are perpendicular to each other in pairs; The widths of the first sub-portion and the second sub-portion along the second direction are d1 and d2 respectively, and the width of the second communication portion along the second direction is D; wherein, D and d1 satisfy: 0.2 ≤ D / d1 ≤ 20; and / or, D and d2 satisfy: 0.2 ≤ D / d2 ≤ 20.

12. The battery cell according to claim 1, wherein The electrode assembly includes a main body portion and a tab. The tab is provided at at least one end of the main body portion along the first direction. The first direction intersects the arrangement direction of the support mechanism and the electrode assembly; In the thickness direction of the support plate, the projection of the support assembly is located within the projection of the main body portion.

13. A battery, characterized in that, Including a plurality of battery cells according to any one of claims 1-12.

14. An electrical device, characterized in that, Including the battery according to claim 13, the battery being used to provide electrical energy.

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