Battery cell, battery, and electric device

Abstract

The present application provides a battery cell, a battery, and an electric device. The battery cell comprises a casing, a valve body, and a movable valve; the casing has an accommodating cavity and a first wall; a first through hole is formed in the first wall, and is communicated with the accommodating cavity and the exterior of the battery cell; the valve body is connected to the first wall; a second through hole is formed in the valve body, and is communicated with the accommodating cavity; the movable valve is movably connected to the valve body, and is configured to be capable of switching between a blocked state and a connected state with respect to the valve body; in the blocked state, the first through hole and the second through hole are closed; and in the connected state, the second through hole is communicated with the exterior of the battery cell through the first through hole. According to the battery cell provided by the present application, control of the humidity in the accommodating cavity during manufacturing of the battery cell is facilitated, and the reliability of the battery cell is improved.

Description

Battery cells, batteries, and electrical devices

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application No. 202420353601.X filed on February 26, 2024, entitled “Battery Cell, Battery, and Electrical Device,” the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present application belongs to the field of battery technology, and in particular relates to a battery cell, a battery, and an electrical device. Background Art

[0004] Batteries are widely used in electronic devices such as mobile phones, laptops, electric vehicles, electric airplanes, electric boats, electric toy cars, electric toy boats, electric toy airplanes and power tools, etc.

[0005] In the development of battery cell technology, in addition to improving the performance of battery cells, the reliability of battery cells is also an issue that needs to be considered. Therefore, how to improve the reliability of battery cells is an issue that needs to be continuously improved in battery cell technology.

[0006] Summary of the Invention

[0007] The embodiments of the present application provide a battery cell, a battery, and an electrical device, which can improve the reliability of the battery cell.

[0008] In the first aspect, the present application provides a battery cell, which includes a shell, a valve body and a movable valve, the shell having a accommodating cavity and a first wall, the first wall having a first through hole, the first through hole connecting the accommodating cavity and the outside of the battery cell; the valve body is connected to the first wall, the valve body having a second through hole, the second through hole connecting with the accommodating cavity; the movable valve is movably connected to the valve body, and the movable valve is configured to be able to switch with the valve body between a blocked state and a connected state, in the blocked state, the first through hole and the second through hole are cut off, and in the connected state, the second through hole is connected with the outside of the battery cell via the first through hole.

[0009] The battery cell provided in the embodiment of the present application is provided with a movable valve and a valve body, and the movable valve is provided to be movably connected to the valve body, so that during the manufacturing process of the battery cell, the movable valve and the valve body can be switched between a blocked state and a connected state by controlling the movement or rotation of the movable valve relative to the valve body, thereby achieving the sealing of the battery cell's accommodating cavity or the connection with the outside of the battery cell, so as to achieve the sealing of the accommodating cavity or the connection between the accommodating cavity and the outside of the battery cell according to the requirements of different process stages of the battery cell. In this way, it is convenient to control the humidity in the accommodating cavity during the manufacturing process of the battery cell, which is beneficial to improving the reliability performance of the battery cell.

[0010] In some embodiments, the valve body includes a receiving groove that communicates with the first through-hole and the second through-hole, with the movable valve at least partially located within the receiving groove. This arrangement allows the valve body and the movable valve to switch between a blocked state and a connected state while also reducing the space occupied by the movable valve, thereby simplifying the structure of the battery cell and improving its energy density.

[0011] In some embodiments, the movable valve has a third through hole that communicates with the exterior of the battery cell. In the blocked state, the third through hole is blocked from the second through hole, and in the connected state, the second through hole is connected to the third through hole. Providing the movable valve with the third through hole allows the second through hole to be connected or blocked with the first through hole by connecting or blocking the second through hole with the third through hole, thereby facilitating the transition between the blocked and connected states of the valve body and the movable valve and reducing the operational difficulty of the transition between the two states.

[0012] In some embodiments, the accommodating groove has an opening and a first sidewall adjacent to the opening, and the second through hole is formed through the first sidewall. The second through hole is provided on the first sidewall to facilitate communication or blocking between the second through hole and the third through hole, thereby achieving the purpose of switching the valve body and the movable valve between a blocked state and a connected state.

[0013] In some embodiments, the accommodating tank has an opening and a first bottom wall, the first bottom wall being disposed opposite the opening, and a second through hole being disposed through the first bottom wall. Providing the second through hole on the first bottom wall facilitates the passage of gas or water vapor within the accommodating chamber through the second and third through holes, thereby facilitating smoother electrolyte injection during the process of injecting electrolyte into the battery cell.

[0014] In some embodiments, the movable valve has multiple third through holes, and the valve body has multiple second through holes. In the blocked state, any third through hole is blocked from any second through hole, and in the connected state, at least one third through hole is connected to at least one second through hole. This facilitates controlling the rate of gas discharge from the chamber during formation of the battery cells, and the rate of liquid injection during liquid injection.

[0015] In some embodiments, the number of third through holes is equal to the number of second through holes. In the connected state, the second through holes are connected to the third through holes one by one. In this way, the movable valve can be adjusted in terms of its movement angle or displacement relative to the valve body to control the connected area between the third through holes and the second through holes. In the connected state, the second through holes and the third through holes have a larger connected area, which helps to increase the gas discharge rate within the accommodating cavity during the formation process of the battery cells and the injection rate during the injection process of the battery cells.

[0016] In some embodiments, the movable valve is rotatably connected to the valve body. Thus, by rotating the movable valve relative to the valve body, the movable valve and the valve body can be switched between a connected state and a blocked state, which helps to simplify the structure of the valve body and the movable valve and reduce the difficulty of operating the state switch between the two.

[0017] In some embodiments, the valve body and the first wall are integrally formed, which helps to simplify the structure of the battery cell and reduce the difficulty of manufacturing the battery cell.

[0018] In some embodiments, the movable valve and the third through-hole are disposed through the first through-hole. This helps improve the connection reliability between the movable valve and the first wall, thereby improving the structural reliability of the battery cell. Furthermore, during the process of discharging the gas in the accommodating cavity through the first through-hole, it can also be discharged through the third through-hole without contacting the first wall, which helps reduce the risk of corrosion of the first wall by the gas, water vapor, or injected electrolyte in the accommodating cavity.

[0019] In a second aspect, an embodiment of the present application provides a battery, comprising a battery cell provided by any of the above embodiments.

[0020] The battery provided in the embodiment of the present application has the same technical effects as the battery cells provided in the above embodiments, and thus will not be described in detail here.

[0021] In a third aspect, an embodiment of the present application provides an electrical device, comprising the battery provided in the above embodiment, and the battery is used to provide electrical energy.

[0022] The electrical device provided in the embodiment of the present application has the same technical effects as the battery provided in the above embodiment, and thus will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the drawings without creative work.

[0024] FIG1 is a schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0025] FIG2 is a schematic structural diagram of a battery provided in some embodiments of the present application;

[0026] FIG3 is a schematic structural diagram of a battery module in a battery provided in some embodiments of the present application;

[0027] FIG4 is a schematic diagram of an exploded structure of a battery cell provided in some embodiments of the present application;

[0028] FIG5 is a front view of a battery cell provided in some embodiments of the present application;

[0029] FIG6 is a cross-sectional view of FIG5 along AA in a blocked state;

[0030] FIG7 is a cross-sectional view of FIG5 along AA in a connected state;

[0031] FIG8 is another cross-sectional view along AA in FIG5 in the blocked state;

[0032] FIG9 is another cross-sectional view of FIG5 along AA in the connected state;

[0033] FIG10 is a schematic structural diagram of a battery cell provided in some embodiments of the present application with some structures omitted;

[0034] FIG11 is a schematic diagram of the structure of a movable valve in a battery cell provided in some embodiments of the present application;

[0035] FIG12 is a schematic structural diagram of a valve body in a battery cell provided in some embodiments of the present application.

[0036] In the accompanying drawings, the drawings are not necessarily drawn to scale.

[0037] Marking Description:

[0038] 1. Vehicle; 1a. Motor; 1b. Controller;

[0039] 10. Battery; 11. First housing; 12. Second housing;

[0040] 20. Battery module;

[0041] 30. Battery cell; 31. Housing; 31a. Accommodation cavity; 311. Housing; 312. End cap; 313. First wall; 313a. First through hole; 32. Electrode assembly;

[0042] 40, valve body; 40a, second through hole; 411, accommodating groove; 411a, opening; 4111, first side wall; 4112, first bottom wall;

[0043] 50. Movable valve; 50a. Third through hole. DETAILED DESCRIPTION

[0044] The following detailed description of the embodiments of the present application is provided in conjunction with the accompanying drawings and examples. The following detailed description of the embodiments and the accompanying drawings are used to illustrate the principles of the present application, but are not intended to limit the scope of the present application, that is, the present application is not limited to the described embodiments.

[0045] In the description of this application, it should be noted that, unless otherwise specified, "multiple" means more than two; the terms "upper", "lower", "left", "right", "inside", "outside", etc., indicating directions or positional relationships, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on this application. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. "Vertical" is not strictly perpendicular, but is within the allowable error range. "Parallel" is not strictly parallel, but is within the allowable error range.

[0046] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the 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 in this application may be combined with other embodiments.

[0047] It should also be noted that, in the description of this application, unless otherwise specified or limited, the terms "installed," "connected," and "connected" should be understood broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to direct connections or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0048] The term "plurality" used in this application refers to two or more (including two).

[0049] In this application, battery cells may include lithium-ion secondary battery cells, lithium-ion primary battery cells, lithium-sulfur battery cells, sodium-lithium-ion battery cells, sodium-ion battery cells, or magnesium-ion battery cells, and the embodiments of this application are not limited thereto. Battery cells may be cylindrical, flat, rectangular, or in other shapes, and the embodiments of this application are not limited thereto.

[0050] The battery mentioned in the embodiments of the present application may include one or more battery cells to provide a single physical module with higher voltage and capacity. When there are multiple battery cells, the multiple battery cells are connected in series, in parallel or in hybrid through a busbar.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] In some embodiments, the battery may be an energy storage device, including an energy storage container, an energy storage cabinet, and the like.

[0055] 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, located between the positive and negative electrodes, prevents short circuits while allowing the active ions to pass through.

[0056] 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.

[0057] 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.

[0058] As an example, the positive electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium with a silver surface treatment may be used. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0059] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and modified compounds thereof. However, this application is not limited to these materials; other conventional materials that can be used as positive electrode active materials for batteries may also be used. These positive electrode active materials may be used singly or in combination of two or more.

[0060] In some embodiments, the positive electrode may be a carbon foam or a metal foam. The metal foam may be nickel foam, copper foam, aluminum foam, or an alloy foam, among others. When the metal foam is used as the positive electrode, the surface of the metal foam may or may not be provided with a positive electrode active material. For example, a lithium source material, potassium metal, or sodium metal may be filled and / or deposited within the metal foam, where the lithium source material is lithium metal and / or a lithium-rich material.

[0061] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0062] As an example, the negative electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, silver-surface-treated stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium may be used. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material substrate (such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0063] 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.

[0064] 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.

[0065] 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.

[0066] In some embodiments, the negative electrode may be made of carbon foam or metal foam. The metal foam may be nickel foam, copper foam, aluminum foam, or alloy foam. When the metal foam is used as the negative electrode sheet, the surface of the metal foam may or may not be provided with a negative electrode active material.

[0067] As an example, the negative electrode current collector may be filled with or / and deposited with a lithium source material, potassium metal, or sodium metal, where the lithium source material is lithium metal and / or a lithium-rich material.

[0068] 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.

[0069] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode. The present application does not particularly limit the type of separator, and any known porous separator with good chemical and mechanical stability can be selected.

[0070] 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.

[0071] 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.

[0072] In some embodiments, the electrode assembly is a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into the wound structure.

[0073] In some embodiments, the electrode assembly is a laminate structure.

[0074] Multiple positive electrode sheets and multiple negative electrode sheets can be provided respectively, and multiple positive electrode sheets and multiple negative electrode sheets can be alternately stacked.

[0075] As an example, a plurality of positive electrode sheets may be provided, and the negative electrode sheet may be folded to form a plurality of stacked folded segments, with a positive electrode sheet being sandwiched between adjacent folded segments.

[0076] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of stacked folded segments.

[0077] As an example, a plurality of separators may be provided, each of which is provided between any adjacent positive electrode sheets or negative electrode sheets.

[0078] As an example, the separator may be provided continuously, and may be provided between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0079] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, or polygonal.

[0080] 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.

[0081] The battery cell also includes a housing, which has a housing formed inside for accommodating the electrode assembly. The housing can protect the electrode assembly from the outside to prevent external foreign matter from affecting the charging or discharging of the electrode assembly.

[0082] In the related art, during the manufacturing process of the battery cell, the electrolyte injection hole on its outer shell for injecting the electrolyte is usually in an open state before the electrolyte is injected, such as during the transportation process. In this way, external water vapor will enter the interior of the battery cell's accommodation cavity, causing a certain impact on the humidity of the battery cell's accommodation cavity. During the battery cell manufacturing process, it is difficult to control the humidity inside the battery cell, resulting in low reliability of the battery cell after the battery cell is prepared and formed.

[0083] In view of this, an embodiment of the present application provides a technical solution, which provides a battery cell including a valve body and a movable valve, and provides the valve body and the movable valve to be able to switch between a blocked state and a connected state, so that during the manufacturing process of the battery cell, the accommodating cavity and the outside of the battery cell can be connected or sealed at an appropriate time, which is convenient for controlling the humidity in the accommodating cavity during the preparation of the battery cell, and is beneficial to improving the reliability performance of the battery cell after the battery cell is manufactured.

[0084] The technical solutions described in the embodiments of the present application are applicable to battery cells, batteries including battery cells, and electrical devices using batteries.

[0085] Electrical devices may include vehicles, mobile phones, portable devices, laptop computers, ships, spacecraft, electric toys, and electric tools, etc. Vehicles may include fuel vehicles, gas vehicles, or new energy vehicles. New energy vehicles may include pure electric vehicles, hybrid vehicles, or extended-range vehicles, etc. 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. Electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools, and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical devices.

[0086] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device.

[0087] As shown in FIG1 , a battery 10 is provided inside a vehicle 1. The battery 10 may be provided at the bottom, head, or tail of the vehicle 1. The battery 10 may be used to power the vehicle 1, for example, the battery 10 may serve as an operating power source for the vehicle 1.

[0088] The vehicle 1 may further include a controller 1b and a motor 1a. The controller 1b is used to control the battery 10 to supply power to the motor 1a, for example, to meet the power requirements of the vehicle 1 during starting, navigation, and driving.

[0089] In some embodiments of the present application, the battery 10 can not only serve as the operating power source of the vehicle 1, but also serve as the driving power source of the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0090] 2 , the battery 10 includes battery cells (not shown in FIG2 ) and may further include a case for accommodating the battery cells.

[0091] The box body is used to accommodate battery cells, and the box body can be of various structural forms. In some embodiments, the box body may include a first box body portion 11 and a second box body portion 12. The first box body portion 11 and the second box body portion 12 cover each other. The first box body portion 11 and the second box body portion 12 jointly define a storage space for accommodating battery cells. The second box body portion 12 can be a hollow structure with one end open, and the first box body portion 11 is a plate-like structure. The first box body portion 11 covers the open side of the second box body portion 12 to form a box body with a storage space; the first box body portion 11 and the second box body portion 12 can also be hollow structures with one side open. The open side of the first box body portion 11 covers the open side of the second box body portion 12 to form a box body with a storage space. Of course, the first box body portion 11 and the second box body portion 12 can be of various shapes, such as cylinders, cuboids, etc.

[0092] In order to improve the sealing performance after the first box body 11 and the second box body 12 are connected, a sealing member such as a sealant or a sealing ring may be provided between the first box body 11 and the second box body 12 .

[0093] Assuming that the first box body portion 11 covers the second box body portion 12 , the first box body portion 11 can also be referred to as an upper box cover, and the second box body portion 12 can also be referred to as a lower box body.

[0094] In the battery 10, there can be one or more battery cells. If there are multiple battery cells, they can be connected in series, in parallel, or in a hybrid connection. A hybrid connection refers to a combination of series and parallel connections. Multiple battery cells can be directly connected in series, in parallel, or in a hybrid connection, and then the entire battery module 20 is housed in a housing. Alternatively, multiple battery cells can be first connected in series, in parallel, or in a hybrid connection to form a battery module 20. Multiple battery modules 20 are then connected in series, in parallel, or in a hybrid connection to form a single unit, which is then housed in a housing.

[0095] As shown in FIG3 , in some embodiments, a battery module 20 includes multiple battery cells 30. Multiple battery cells 30 are first connected in series, parallel, or in series to form a battery module 20. Multiple battery modules 20 are then connected in series, parallel, or in series to form a single unit and housed in a housing.

[0096] In some embodiments, the multiple battery cells 30 in the battery module 20 may be electrically connected via a busbar to achieve parallel connection, series connection, or mixed connection of the multiple battery cells 30 in the battery module 20 .

[0097] The battery 10 may also not have a box body, but include multiple battery cells connected in series or in parallel. After the multiple battery cells are connected in series or in parallel, they are fixed by structures such as steel belts or binding straps. Then, multiple batteries 10 are connected in series or in parallel to form a new energy storage unit.

[0098] In some embodiments, the multiple battery cells in the battery 10 may be electrically connected via a busbar to achieve parallel connection, series connection, or hybrid connection of the multiple battery cells in the battery 10 .

[0099] 4 , a battery cell 30 provided in an embodiment of the present application includes an electrode assembly 32 and a housing 31 . The housing 31 has a receiving cavity 31 a , and the electrode assembly 32 is received in the receiving cavity 31 a .

[0100] The outer shell 31 may include a shell 311 and an end cover 312. When assembling the battery cell 30, the electrode assembly 32 may be placed into the accommodating cavity 31a first, and then the end cover 312 may be covered on the shell 311. Then, the electrolyte may be injected into the accommodating cavity 31a through the electrolyte injection port on the end cover 312.

[0101] In some embodiments, the housing 31 may also be used to contain electrolytes, such as electrolytes. The housing 31 may be in various structural forms.

[0102] The outer shell 31 can have a variety of shapes, such as a cylinder, a rectangular parallelepiped, etc. The shape of the outer shell 31 can be determined based on the specific shape of the electrode assembly 32. For example, if the electrode assembly 32 has a cylindrical structure, the outer shell 31 can also be a cylindrical structure. If the electrode assembly 32 has a rectangular parallelepiped structure, the outer shell 31 can also be a rectangular parallelepiped structure. In Figure 4, for example, the outer shell 31 and the electrode assembly 32 are both rectangular parallelepiped structures. In Figure 5, the outer shell 31 and the electrode assembly 32 are both cylindrical structures.

[0103] The shell 31 can be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc., and the embodiment of the present application does not impose any special restrictions on this.

[0104] There may be one or more electrode assemblies 32 housed in the housing 31. In FIG4 , there are two electrode assemblies 32 housed in the housing 31.

[0105] As shown in Figures 4, 5, 6, and 7, a battery cell 30 according to an embodiment of the present application includes a housing 31, a valve body 40, and a movable valve 50. The housing 31 has a housing 31a and a first wall 313. The first wall 313 has a first through-hole 313a, which connects the housing 31a with the exterior of the battery cell 30. The valve body 40 is connected to the first wall 313 and has a second through-hole 40a, which connects the housing 31a. The movable valve 50 is movably connected to the valve body 40 and is configured to switch between a blocked state and a connected state with the valve body 40. In the blocked state, the first through-hole 313a and the second through-hole 40a are blocked. In the connected state, the second through-hole 40a connects with the exterior of the battery cell 30 via the first through-hole 313a.

[0106] The outer shell 31 may include a shell 311 and an end cover 312. The first wall 313 may be a portion of the shell 311 of the outer shell 31, or the first wall 313 may also be at least a portion of the end cover 312 of the outer shell 31. The first wall 313 has a first through hole 313a, and the first through hole 313a connects the accommodating cavity 31a and the outside of the accommodating cavity 31a. During the manufacturing process of the battery cell 30, the electrolyte can be injected into the accommodating cavity 31a of the battery cell 30 through the first through hole 313a. Alternatively, during the formation process of the battery cell 30, the gas generated in the accommodating cavity 31a of the battery cell 30 can be discharged through the first through hole 313a. Alternatively, during the baking process of the battery cell 30, the water vapor in the accommodating cavity 31a can be discharged through the first through hole 313a.

[0107] The valve body 40 is connected to the first wall 313. The valve body 40 and the first wall 313 can be formed separately and then connected together by welding, riveting and other processes, or the valve body 40 can be integrally formed with the first wall 313, which can be set according to actual needs.

[0108] Optionally, the valve body 40 can be connected to the first through hole 313a, or the valve body 40 can be connected to the side of the first wall 313 close to the accommodating cavity 31a. Of course, the valve body 40 can also be arranged to pass through the first through hole 313a of the first wall 313.

[0109] The movable valve 50 can be movably connected to the valve body 40. Optionally, the movable valve 50 and the valve body 40 can be plug-in connected, rotationally connected or hingedly connected, so that the movable valve 50 can move, rotate, etc. relative to the valve body 40, so as to realize the conversion of the movable valve 50 and the valve body 40 between the connected state and the blocked state.

[0110] In the blocked state, the first through hole 313a and the second through hole 40a are blocked, and the movable valve 50 blocks the first through hole 313a and the second through hole 40a, so that the fluid flowing through the first through hole 313a cannot flow into the second through hole 40a, and the fluid flowing through the second through hole 40a cannot flow through the first through hole 313a, thereby facilitating the sealing of the accommodating cavity 31a. For example, during the manufacturing process of the battery cell 30, if the battery cell 30 needs to be transported, the movable valve 50 and the valve body 40 can be controlled to be in a blocked state, thereby reducing the risk of external water vapor entering the interior of the accommodating cavity 31a and affecting the humidity inside the accommodating cavity 31a.

[0111] In the connected state, the first through hole 313a and the second through hole 40a are connected, and the fluid in the second through hole 40a can flow to the first through hole 313a, and the fluid flowing through the first through hole 313a can also flow to the second through hole 40a, so as to facilitate the injection of electrolyte into the accommodating cavity 31a of the battery cell 30 through the first through hole 313a and the second through hole 40a, or during the baking process, it is convenient to discharge water vapor and the like in the accommodating cavity 31a, or, during the formation process, it is convenient to discharge the gas generated in the accommodating cavity 31a to the outside of the accommodating cavity 31a through the first through hole 313a and the second through hole 40a.

[0112] It can be understood that the way in which the valve body 40 and the movable valve 50 are switched between the connected state and the blocked state can be set according to the specific form of the movable connection between the valve body 40 and the movable valve 50. For example, the movable valve 50 and the valve body 40 can be set as a plug-in connection, and the valve body 40 and the movable valve 50 can be switched between the connected state and the blocked state by plugging and unplugging the movable valve 50 relative to the valve body 40; or, the valve body 40 and the movable valve 50 can be set as a rotational connection, and the valve body 40 and the movable valve 50 can be switched between the connected state and the blocked state by rotating the movable valve 50 relative to the valve body 40.

[0113] The battery cell 30 provided in the embodiment of the present application is provided with a movable valve 50 and a valve body 40, and the movable valve 50 is provided to be movably connected to the valve body 40, so that during the manufacturing process of the battery cell 30, by controlling the movement or rotation of the movable valve 50 relative to the valve body 40, the movable valve 50 and the valve body 40 can be switched between a blocked state and a connected state, thereby achieving the sealing of the accommodating cavity 31a of the battery cell 30 or the connection with the outside of the battery cell 30, so as to achieve the sealing of the accommodating cavity 31a or the connection between the accommodating cavity 31a and the outside of the battery cell 30 according to the requirements of different process stages of the battery cell 30. In this way, it is convenient to control the humidity in the accommodating cavity 31a during the manufacturing process of the battery cell 30, which is beneficial to improving the reliability performance of the battery cell 30.

[0114] As shown in FIG. 5 and FIG. 6 , in some embodiments, the valve body 40 has a receiving groove 411 , which communicates with the first through hole 313 a and the second through hole 40 a . At least a portion of the movable valve 50 is located in the receiving groove 411 .

[0115] In this way, the first through hole 313a and the second through hole 40a can be connected through the accommodating groove 411, and the part of the movable valve 50 located in the accommodating groove 411 can be movably connected with the valve body 40, and through the movement of the movable valve 50, the movable valve 50 located in the accommodating groove 411 can block or open the second through hole 40a, so as to realize the cutoff or connection of the second through hole 40a and the accommodating groove 411.

[0116] It is understood that the movable valve 50 can be configured such that the accommodating groove 411 always maintains communication with the first through-hole 313a during its movement relative to the valve body 40. However, when the second through-hole 40a and the accommodating groove 411 are blocked, the first through-hole 313a cannot pass through the accommodating groove 411 to the first through-hole 313a, i.e., the valve body 40 and the movable valve 50 are in a blocked state. However, when the second through-hole 40a and the accommodating groove 411 are in communication, the first through-hole 313a can communicate with the first through-hole 313a through the accommodating groove 411, i.e., the valve body 40 and the movable valve 50 are in a communication state.

[0117] The valve body 40 is provided with a receiving groove 411, and at least a portion of the movable valve 50 is provided to be located in the receiving groove 411. On the premise of realizing the switching of the valve body 40 and the movable valve 50 between the blocked state and the connected state, the additional space occupied by the movable valve 50 can also be reduced, which is beneficial to simplifying the structure of the battery cell 30 and improving the energy density of the battery cell 30.

[0118] As shown in Figures 5 and 6, in some embodiments, the active valve 50 has a third through hole 50a, which is connected to the outside of the battery cell 30. In the blocked state, the third through hole 50a and the second through hole 40a are cut off. In the connected state, the second through hole 40a and the third through hole 50a are connected.

[0119] Alternatively, the second through hole 40a can be provided at the side or bottom of the accommodating groove 411. By controlling the movement of the movable valve 50 relative to the valve body 40, the third through hole 50a is aligned with the second through hole 40a, or the second through hole 40a is blocked by the movable valve 50.

[0120] It is understood that when the second through hole 40a is at least partially aligned with the third through hole 50a, communication between the third through hole 50a and the second through hole 40a can be achieved, thereby enabling communication between the accommodating cavity 31a and the outside of the battery cell 30 through the first through hole 313a. When the third through hole 50a is not partially aligned with the third through hole 50a, the second through hole 40a and the third through hole 50a are blocked, thereby achieving sealing of the accommodating cavity 31a.

[0121] The movable valve 50 can be arranged to move relative to the accommodating groove 411 to achieve the conversion of the movable valve 50 and the valve body 40 between the connected state and the blocked state through a plugging and pulling movement, or the movable valve 50 can be arranged to move relative to the accommodating groove 411 to achieve the conversion of the movable valve 50 and the valve body 40 between the connected state and the blocked state through a rotating movement. The specific selection can be made according to actual needs.

[0122] Optionally, the number of the second through holes 40a may be one or more. Similarly, the number of the third through holes 50a may be one or more. The number of the second through holes 40a may be equal to or different from the number of the first through holes 313a.

[0123] The third through hole 50 a may communicate with the first through hole 313 a to communicate with the outside of the battery cell 30 through the first through hole 313 a , or at least a portion of the third through hole 50 a may be located within the first through hole 313 a .

[0124] The movable valve 50 is provided with a third through hole 50a, so that the second through hole 40a can be connected or cut off with the first through hole 313a by connecting or cutting off the second through hole 40a with the third through hole 50a, which makes it easier for the valve body 40 and the movable valve 50 to switch between the blocked state and the connected state, and reduces the operational difficulty of the state conversion between the two.

[0125] As shown in FIG. 5 , FIG. 6 and FIG. 7 , in some embodiments, the receiving groove 411 has an opening 411 a and a first side wall 4111 adjacent to the opening 411 a , and the second through hole 40 a is disposed through the first side wall 4111 .

[0126] In this way, the third through hole 50a and the second through hole 40a are respectively located on the sides of the movable valve 50 and the valve body 40, and the second through hole 40a and the third through hole 50a can be connected or blocked by controlling the movable valve 50 to rotate or move relative to the valve body 40.

[0127] The second through hole 40a is located on the first side wall 4111 to facilitate the connection or disconnection of the second through hole 40a and the third through hole 50a, thereby achieving the purpose of switching the valve body 40 and the movable valve 50 between the blocked state and the connected state.

[0128] As shown in FIG. 5 , FIG. 8 and FIG. 9 , in some embodiments, the receiving groove 411 has an opening 411 a and a first bottom wall 4112 . The first bottom wall 4112 is disposed opposite to the opening 411 a , and the second through hole 40 a is disposed through the first bottom wall 4112 .

[0129] The second through hole 40a is penetrated through the first bottom wall 4112, and the second through hole 40a can be set away from the center of the first bottom wall 4112, so that when the movable valve 50 rotates relative to the valve body 40, the third through hole 50a can switch between being connected to or cut off from the second through hole 40a, thereby achieving the purpose of converting the valve body 40 and the movable valve 50 between a blocked state and a connected state.

[0130] It can be understood that the second through hole 40a is located on the first bottom wall 4112, which makes it easier for gas or water vapor in the accommodating cavity 31a to pass through the second through hole 40a and the third through hole 50a, thereby improving the smoothness of electrolyte injection during the process of injecting electrolyte into the battery cell 30.

[0131] In some embodiments, the movable valve 50 has multiple third through holes 50a, and the valve body 40 has multiple second through holes 40a. In the blocked state, any third through hole 50a is cut off from any second through hole 40a. In the connected state, at least one third through hole 50a is connected to at least one second through hole 40a.

[0132] Thus, in the connected state, at least one third through hole 50a is connected to at least one second through hole 40a, that is, multiple third through holes 50a can be provided to be connected to multiple second through holes 40a respectively, or one third through hole 50a is connected to multiple second through holes 40a, or multiple third through holes 50a are connected to one second through hole 40a. In the blocked state, none of the third through holes 50a is connected to any of the second through holes 40a. The movable valve 50 can be set to a movement angle or displacement relative to the valve body 40 as needed to control the connection area between the third through hole 50a and the second through hole 40a. In the connected state, the discharge rate of the gas in the accommodating cavity 31a can be controlled during the formation of the battery cell 30, and the injection rate can be controlled during the injection of the battery cell 30.

[0133] In some embodiments, the number of the third through holes 50 a is equal to the number of the second through holes 40 a , and in a connected state, the second through holes 40 a are connected to the third through holes 50 a one-to-one.

[0134] In this way, the movement angle or displacement of the movable valve 50 relative to the valve body 40 can be set as needed to control the communication area of ​​the third through hole 50a and the second through hole 40a, and in the connected state, the second through hole 40a and the third through hole 40a have a larger communication area, which is beneficial to increase the discharge rate of the gas in the accommodating cavity 31a during the formation of the battery cell 30, and is beneficial to increase the injection rate during the injection of the battery cell 30.

[0135] As shown in FIG. 10 , FIG. 11 and FIG. 12 , in some embodiments, the movable valve 50 is rotatably connected to the valve body 40 .

[0136] In this way, by rotating the movable valve 50 relative to the valve body 40, the movable valve 50 and the valve body 40 can be switched between the connected state and the blocked state, which is beneficial to simplify the structure of the valve body 40 and the movable valve 50 and reduce the operational difficulty of the state switching between the two.

[0137] In some embodiments, the valve body 40 and the first wall 313 are integrally formed.

[0138] This helps to simplify the structure of the battery cell 30 and reduce the manufacturing difficulty of the battery cell 30 .

[0139] As shown in FIG. 5 and FIG. 6 , in some embodiments, the movable valve 50 and the third through hole 50 a are disposed through the first through hole 313 a .

[0140] In this manner, at least a portion of the movable valve 50 is disposed within the first through-hole 313a and connected to the first wall 313, thereby improving the connection reliability between the movable valve 50 and the first wall 313 and, in turn, the structural reliability of the battery cell 30. Furthermore, because the third through-hole 50a is disposed within the first through-hole 313a, the gas within the accommodating chamber 31a can be discharged through the second through-hole 40a during its discharge through the first through-hole 313a without contacting the first wall 313. This reduces the risk of corrosion of the first wall 313 by gas, water vapor, or injected electrolyte within the accommodating chamber 31a.

[0141] The battery 10 provided according to an embodiment of the present application includes the battery cell 30 provided in any of the above embodiments.

[0142] The battery 10 provided in the embodiment of the present application has the same technical effects as the battery cell 30 provided in any of the above embodiments, and thus will not be described in detail here.

[0143] The electrical device provided according to an embodiment of the present application includes the battery cell 30 or the battery 10 provided in any of the above embodiments, and the battery 10 is used to provide electrical energy.

[0144] The electrical device provided in the embodiment of the present application has the same technical effects as the battery cell 30 or the battery 10 provided in any of the above embodiments, and thus will not be described in detail here.

[0145] As shown in Figures 5 to 12, in some embodiments, the battery cell 30 provided by the present invention includes a housing 31, a valve body 40, and a movable valve 50. The housing 31 has a receiving chamber 31a and a first wall 313. The first wall 313 has a first through-hole 313a, which connects the receiving chamber 31a with the exterior of the battery cell 30. The valve body 40 is connected to the first wall 313 and has a receiving groove 411 and a second through-hole 40a. The receiving groove 411 connects the first through-hole 313a and the second through-hole 40a. The second through-hole 40a communicates with the receiving chamber 31a. The movable valve 50 is movably connected to the valve body 40, with at least a portion of the movable valve 50 located within the receiving groove 411. The movable valve 50 has a third through-hole 50a, which connects the third through-hole 50a with the exterior of the battery cell 30, and the second through-hole 40a communicates with the third through-hole 50a. The movable valve 50 is configured to rotate relative to the valve body 40, allowing the movable valve 50 and the valve body 40 to switch between a blocked state and a connected state. In the blocked state, the third through hole 50a is blocked from the second through hole 40a. In the connected state, the third through hole 50a is connected to the second through hole 40a. The accommodating groove 411 has an opening 411a and a first side wall 4111 adjacent to the opening 411a. The second through hole 40a is formed through the first side wall 4111. The movable valve 50 has a plurality of third through holes 50a, and the valve body 40 has a plurality of second through holes 40a. The number of third through holes 50a is equal to the number of second through holes 40a. In the blocked state, any third through hole 50a is blocked from any second through hole 40a. In the connected state, the second through holes 40a are connected to the third through holes 50a one-to-one.

[0146] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and components may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features described in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions within the scope of the claims.

Claims

1. A battery cell, comprising: A housing having a housing cavity and a first wall, wherein the first wall has a first through hole, and the first through hole communicates with the housing cavity and the outside of the battery cell; a valve body connected to the first wall, the valve body having a second through hole, the second through hole being in communication with the accommodating cavity; A movable valve is movably connected to the valve body, and the movable valve is configured to be able to switch between a blocked state and a connected state with the valve body. In the blocked state, the first through hole and the second through hole are cut off. In the connected state, the second through hole is connected to the outside of the battery cell via the first through hole.

2. The battery cell according to claim 1, wherein: The valve body has a receiving groove, the receiving groove is communicated with the first through hole and the second through hole, and at least a portion of the movable valve is located in the receiving groove.

3. The battery cell according to claim 2, wherein: The movable valve has a third through hole, which is connected to the outside of the battery cell. In the blocked state, the third through hole is blocked from the second through hole. In the connected state, the second through hole is connected to the third through hole.

4. The battery cell according to claim 3, wherein: The accommodating groove has an opening and a first side wall adjacent to the opening, and the second through hole is penetrated through the first side wall.

5. The battery cell according to claim 3, wherein: The accommodating groove has an opening and a first bottom wall, the first bottom wall is arranged opposite to the opening, and the second through hole is penetrated through the first bottom wall.

6. The battery cell according to any one of claims 3 to 5, wherein: The movable valve has a plurality of the third through holes, and the valve body has a plurality of the second through holes. In the blocked state, any of the third through holes is cut off from any of the second through holes. In the connected state, at least one of the third through holes is connected to at least one of the second through holes.

7. The battery cell according to claim 6, wherein: The number of the third through holes is equal to the number of the second through holes. In the connected state, the second through holes are connected to the third through holes one by one.

8. The battery cell according to any one of claims 3 to 7, wherein: The movable valve is rotatably connected to the valve body.

9. The battery cell according to any one of claims 1 to 8, wherein: The valve body and the first wall are integrally formed.

10. The battery cell according to claim 3, wherein: The movable valve and the third through hole are penetrated through the first through hole.

11. A battery comprising the battery cell according to any one of claims 1 to 10.

12. An electrical device comprising the battery cell according to any one of claims 1 to 10 or the battery according to claim 11, wherein the battery is used to provide electrical energy.

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