Battery cell, battery and electric device

Abstract

The utility model provides a battery monomer, a battery and a power utilization device. The single battery comprises a shell, a valve body and a movable valve, the shell is provided with a containing cavity and a first wall, the first wall is provided with a first through hole, and the first through hole communicates with the containing cavity and the exterior of the single battery; the valve body is connected to the first wall and provided with a second through hole, and the second through hole communicates with the containing cavity; the movable valve is movably connected to the valve body, the movable valve and the valve body can be switched between a blocking state and a communicating state, in the blocking state, the first through hole and the second through hole are cut off, and in the communicating state, the second through hole is communicated with the outside of the battery monomer through the first through hole. According to the battery monomer provided by the invention, the humidity in the accommodating cavity in the manufacturing process of the battery monomer is convenient to control, and the reliability of the battery monomer is improved.

Description

Technical Field

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

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

[0003] 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 of continuous improvement in battery cell technology. Utility Model Content

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

[0005] In a 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, 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.

[0006] 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 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 containing cavity of the battery cell or the connection with the outside of the battery cell, so as to achieve the sealing of the containing cavity or the connection between the containing 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 containing cavity during the manufacturing process of the battery cell, which is beneficial to improving the reliability performance of the battery cell.

[0007] In some embodiments, the valve body has a receiving groove, the receiving groove is connected to the first through hole and the second through hole, and at least part of the movable valve is located in the receiving groove. In this way, while realizing the switching between the blocking state and the connecting state of the valve body and the movable valve, the additional space occupied by the movable valve can be reduced, which is conducive to simplifying the structure of the battery cell and improving the energy density of the battery cell.

[0008] In some embodiments, 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 cut off from the second through hole, and in the connected state, the second through hole is connected to the third through hole. The movable valve is provided with the third through hole, so that the second through hole is connected or cut off with the first through hole by connecting or cutting off the second through hole with the third through hole, which makes it easier for the valve body and the movable valve to switch between the blocked state and the connected state, and reduces the difficulty of the operation of switching between the two states.

[0009] In some embodiments, 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. The second through hole is arranged on the first side wall to facilitate the connection or cutoff of the second through hole and the third through hole, thereby achieving the purpose of switching the valve body and the movable valve between the blocked state and the connected state.

[0010] In some embodiments, 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. The second through hole is arranged on the first bottom wall, which is more convenient for gas or water vapor in the accommodating cavity to pass through the second through hole and the third through hole, and is conducive to improving the smoothness of electrolyte injection during the process of injecting electrolyte into the battery cell.

[0011] In some embodiments, the movable valve has a plurality of third through holes, and the valve body has a plurality of second through holes. In the blocked state, any third through hole is cut off 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. Thus, in the connected state, during the formation of the battery cell, it is convenient to control the exhaust rate of the gas in the accommodating cavity, and during the injection of the battery cell, it is convenient to control the injection rate.

[0012] In some embodiments, the number of the third through holes is equal to the number of the second through holes, and in the connected state, the second through holes are connected to the third through holes one by one. In this way, the movement angle or displacement of the movable valve relative to the valve body can be set as needed to control the connected area of ​​the third through holes and the second through holes, and in the connected state, the second through holes and the third through holes have a larger connected area, which is conducive to increasing the discharge rate of the gas in the accommodating cavity during the formation of the battery monomer, and is conducive to increasing the injection rate during the injection of the battery monomer.

[0013] 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 is beneficial to simplifying the structure of the valve body and the movable valve and reducing the difficulty of operating the state switching between the two.

[0014] In some embodiments, the valve body and the first wall are integrally formed, which is helpful to simplify the structure of the battery cell and reduce the difficulty of the process of the battery cell.

[0015] In some embodiments, the movable valve and the third through hole are provided through the first through hole. This helps to improve the connection reliability between the movable valve and the first wall, thereby improving the structural reliability of the battery cell, and the gas in the accommodating cavity can be discharged through the third through hole during the process of being discharged through the first through hole without contacting the first wall, which helps to reduce the risk of the gas, water vapor or injected electrolyte in the accommodating cavity corroding the first wall.

[0016] In a second aspect, an embodiment of the present application provides a battery, comprising a battery cell provided by any of the above embodiments.

[0017] The battery provided in the embodiment of the present application has the same technical effect as the battery cell provided in the above embodiment, which will not be described in detail here.

[0018] In a third aspect, an embodiment of the present application provides an electrical device, including the battery provided in the above embodiment, and the battery is used to provide electrical energy.

[0019] The electric device provided in the embodiment of the present application has the same technical effect as the battery provided in the above embodiment, and thus will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. 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 paying creative work.

[0021] Figure 1 is a schematic structural diagram of a vehicle provided in an embodiment of the present application;

[0022] Figure 2 is a schematic diagram of the structure of a battery provided in an embodiment of the present application;

[0023] Figure 3 is a schematic diagram of the structure of a battery module in a battery provided in an embodiment of the present application;

[0024] Figure 4 is a schematic diagram of the explosion structure of a battery cell provided in an embodiment of the present application;

[0025] Figure 5 is a front view of a battery cell provided in an embodiment of the present application;

[0026] Figure 6 yes Figure 5 A cross-sectional view along AA in the plugged state;

[0027] Figure 7 yes Figure 5 A cross-sectional view along AA in a connected state;

[0028] Figure 8 yes Figure 5 Another cross-sectional view along AA in the plugged state;

[0029] Fig. 9 yes Figure 5 Another cross-sectional view along AA in the connected state;

[0030] Fig.10 is a schematic structural diagram of a battery cell provided in an embodiment of the present application with some structures omitted;

[0031] Fig.11 is a schematic diagram of the structure of a movable valve in a battery cell provided in an embodiment of the present application;

[0032] Fig.12 It is a schematic diagram of the structure of the valve body in the battery cell provided in the embodiment of the present application.

[0033] In the drawings, the drawings are not necessarily drawn to scale.

[0034] Marking Description:

[0035] 1. Vehicle; 1a. Motor; 1b. Controller;

[0036] 10. Battery; 11. First box body; 12. Second box body;

[0037] 20. Battery module;

[0038] 30. Battery cell; 31. Shell; 31a. Accommodation cavity; 311. Shell; 312. End cover; 313. First wall; 313a. First through hole; 32. Electrode assembly;

[0039] 40, valve body; 40a, second through hole; 411, accommodating groove; 411a, opening; 4111, first side wall; 4112, first bottom wall;

[0040] 50. Movable valve; 50a. Third through hole. DETAILED DESCRIPTION

[0041] The following detailed description and drawings of the embodiments of the present application are used to illustrate the principles of the present application, but cannot be used to limit the scope of the present application, that is, the present application is not limited to the described embodiments.

[0042] In the description of the present application, it should be noted that, unless otherwise specified, "multiple" means more than two; the terms "upper", "lower", "left", "right", "inside", "outside", etc., indicating the orientation or positional relationship, are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present 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 vertical, but is within the allowable error range. "Parallel" is not strictly parallel, but is within the allowable error range.

[0043] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0044] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0045] The term "plurality" used in the present application refers to two or more (including two).

[0046] In the present application, the battery cell may include a lithium-ion secondary battery cell, a lithium-ion primary battery cell, a lithium-sulfur battery cell, a sodium-lithium-ion battery cell, a sodium-ion battery cell or a magnesium-ion battery cell, etc., and the embodiments of the present application do not limit this. The battery cell may be cylindrical, flat, rectangular or other shapes, etc., and the embodiments of the present application do not limit this.

[0047] 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 mixed connection through a busbar component.

[0048] 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.

[0049] 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 accommodated in the case.

[0050] 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.

[0051] In some embodiments, the battery may be an energy storage device, which includes an energy storage container, an energy storage cabinet, and the like.

[0052] A battery cell generally includes an electrode assembly. The electrode 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 embedded and removed between the positive electrode and the negative electrode. The separator is set between the positive electrode and the negative electrode to prevent the positive and negative electrodes from short-circuiting, while allowing active ions to pass through.

[0053] In some embodiments, the positive electrode may be a positive electrode sheet, and the positive electrode sheet 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.

[0054] 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 disposed on either or both of the two facing surfaces of the positive electrode current collector.

[0055] 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 silver surface treatment may be used. The composite current collector may include a polymer material base 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.).

[0056] 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 their respective modified compounds. However, the present application is not limited to these materials, and 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 alone or in combination of two or more.

[0057] In some embodiments, the positive electrode may be foamed carbon or foamed metal. The foamed metal may be foamed nickel, foamed copper, foamed aluminum or foamed alloy. When the foamed metal is used as the positive electrode, the positive electrode active material may not be provided on the surface of the foamed metal, but of course, the positive electrode active material may also be provided. As an example, lithium source material, potassium metal or sodium metal may also be filled or / and deposited in the foamed metal, and the lithium source material is lithium metal and / or lithium-rich material.

[0058] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0059] 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, etc. may be used. The composite current collector may include a polymer material base 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.).

[0060] 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.

[0061] 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 disposed on either or both of the two facing surfaces of the negative electrode current collector.

[0062] As an example, the negative electrode active material may adopt the negative electrode active material for battery cells known in the art. 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, lithium titanate, etc.

[0063] In some embodiments, the negative electrode may be foamed carbon or foamed metal. The foamed metal may be foamed nickel, foamed copper, foamed aluminum or foamed alloy, etc. When the foamed metal is used as the negative electrode sheet, the surface of the foamed metal may not be provided with a negative electrode active material, but of course, a negative electrode active material may also be provided.

[0064] As an example, a lithium source material, potassium metal or sodium metal may be filled or / and deposited in the negative electrode current collector, and the lithium source material is lithium metal and / or lithium-rich material.

[0065] 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.

[0066] In some embodiments, the electrode assembly further includes a separator, which is disposed between the positive electrode and the negative electrode. The present application has no particular limitation on the type of separator, and any known porous separator with good chemical stability and mechanical stability can be selected.

[0067] 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.

[0068] In some embodiments, the battery cell further includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. The present application has no specific restrictions on the type of electrolyte, which can be selected according to needs. The electrolyte can be liquid, gel or solid.

[0069] 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.

[0070] In some embodiments, the electrode assembly is a laminate structure.

[0071] A plurality of positive electrode sheets and a plurality of negative electrode sheets can be provided respectively, and the plurality of positive electrode sheets and the plurality of negative electrode sheets can be alternately stacked.

[0072] 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.

[0073] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of folded sections that are stacked.

[0074] 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.

[0075] As an example, the separator may be disposed continuously, and disposed between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0076] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, or polygonal.

[0077] In some embodiments, the electrode assembly is provided with tabs, which can lead current out of the electrode assembly. The tabs include a positive tab and a negative tab.

[0078] The battery cell further includes a housing, and a housing is formed inside the housing to accommodate 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.

[0079] In the related art, during the manufacturing process of the battery cell, the electrolyte injection hole on the outer shell of the battery cell for injecting electrolyte is usually in an open state before the electrolyte is injected, such as during transportation. In this way, external water vapor will enter the interior of the battery cell housing cavity, causing a certain impact on the humidity of the battery cell housing cavity. During the manufacturing process of the battery cell, 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.

[0080] 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 the valve body and the movable valve are configured to be able to switch between a blocked state and a connected state, so that during the manufacturing process of the battery cell, the connection or sealing of the receiving cavity with the outside of the battery cell can be achieved at an appropriate time, which is convenient for controlling the humidity in the receiving 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.

[0081] 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.

[0082] The electrical device may be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, and the like. The vehicle may be a fuel vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, and the like; the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, and the like; the electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, and the like; the electric tool may include a metal cutting electric tool, a grinding electric tool, an assembly electric tool, and an electric tool for railways, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator, and an electric planer, and the like. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical devices.

[0083] For the convenience of description, the following embodiments are described by taking the electric device as a vehicle as an example.

[0084] like Figure 1 As shown, a battery 10 is provided inside the 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 be used as an operating power source for the vehicle 1.

[0085] 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.

[0086] In some embodiments of the present application, the battery 10 can not only serve as an operating power source for the vehicle 1, but also serve as a driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0087] See also Figure 2 As shown, the battery 10 includes a battery cell ( Figure 2 (not shown). The battery 10 may further include a case for accommodating the battery cells.

[0088] The box body is used to accommodate battery cells, and the box body can be in 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 may be a hollow structure with one end open, the first box body portion 11 is a plate-like structure, and 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 may 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 may be in various shapes, such as a cylinder, a cuboid, etc.

[0089] 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, a sealing ring, etc., may be further provided between the first box body 11 and the second box body 12 .

[0090] 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.

[0091] In the battery 10, there can be one or more battery cells. If there are more than one battery cell, the battery cells can be connected in series, in parallel, or in a mixed connection. Mixed connection means that the battery cells are connected in series and in parallel. The battery cells can be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the battery cells can be accommodated in the box. Alternatively, the battery cells can be first connected in series, in parallel, or in a mixed connection to form a battery module 20. The battery modules 20 are then connected in series, in parallel, or in a mixed connection to form a whole, and then accommodated in the box.

[0092] like Figure 3 As shown, in some embodiments, in the battery module 20, there are multiple battery cells 30. The multiple battery cells 30 are first connected in series, in parallel, or in mixed series to form the battery module 20. The multiple battery modules 20 are then connected in series, in parallel, or in mixed series to form a whole, and are accommodated in the box.

[0093] 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 .

[0094] The battery 10 may also not have a casing, 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.

[0095] In some embodiments, multiple battery cells in the battery 10 may be electrically connected via a busbar to achieve parallel connection, series connection, or mixed connection of the multiple battery cells in the battery 10 .

[0096] Please refer to Figure 4 The battery cell 30 provided in the embodiment of the present application includes an electrode assembly 32 and a shell 31 . The shell 31 has a receiving cavity 31 a , and the electrode assembly 32 is received in the receiving cavity 31 a .

[0097] 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 in the accommodating cavity 31 a first, and then the end cover 312 may be covered on the shell 311 . Then, the electrolyte may be injected into the accommodating cavity 31 a through the electrolyte injection port on the end cover 312 .

[0098] 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.

[0099] The outer shell 31 can be in various shapes, such as a cylinder, a cuboid, etc. The shape of the outer shell 31 can be determined according to the specific shape of the electrode assembly 32. For example, if the electrode assembly 32 is a cylindrical structure, the outer shell 31 can be a cylindrical structure. If the electrode assembly 32 is a cuboid structure, the outer shell 31 can be a cuboid structure. Figure 4 In the embodiment, the housing 31 and the electrode assembly 32 are both rectangular parallelepiped structures. Figure 5 In the figure, the housing 31 and the electrode assembly 32 are both cylindrical structures.

[0100] 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.

[0101] There may be one or more electrode assemblies 32 contained in the housing 31. Figure 4 In the embodiment, there are two electrode assemblies 32 housed in the housing 31.

[0102] like Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, the battery cell 30 provided according to the embodiment of the present application includes a shell 31, a valve body 40 and a movable valve 50. The shell 31 has a housing 31a and a first wall 313, and the first wall 313 has a first through hole 313a, and the first through hole 313a communicates with the housing chamber 31a and the outside of the battery cell 30. The valve body 40 is connected to the first wall 313, and the valve body 40 has a second through hole 40a, and the second through hole 40a is connected to the housing chamber 31a. The movable valve 50 is movably connected to the valve body 40, and the movable valve 50 is configured to be able 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 cut off, and in the connected state, the second through hole 40a is connected to the outside of the battery cell 30 via the first through hole 313a.

[0103] The outer shell 31 may include a shell 311 and an end cover 312, and the first wall 313 may be a part of the shell 311 of the outer shell 31, or the first wall 313 may also be at least a part 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, or, 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, or, 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.

[0104] The valve body 40 is connected to the first wall 313 , and 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 and the first wall 313 can be integrally formed and set according to actual needs.

[0105] 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.

[0106] 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, rotatably 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 a connected state and a blocked state.

[0107] 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, when 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 in the accommodating cavity 31a.

[0108] In the connected state, the first through hole 313a and the second through hole 40a are connected, so that 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 inject 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 the 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.

[0109] 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 to be plug-in connected, 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 to be rotatably connected, 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.

[0110] 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 movably connected to the valve body 40, so that during the manufacturing process of the battery cell 30, the movable valve 50 and the valve body 40 are controlled to move or rotate relative to the valve body 40, so as to realize the conversion between the blocked state and the connected state, thereby realizing 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 realize 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.

[0111] like Figure 5 and Figure 6 As shown, in some embodiments, the valve body 40 has a receiving groove 411 , which is connected to the first through hole 313 a and the second through hole 40 a , and at least a portion of the movable valve 50 is located in the receiving groove 411 .

[0112] 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.

[0113] It is understandable that the movable valve 50 can be arranged such that the receiving groove 411 always maintains communication with the first through hole 313a during the movement relative to the valve body 40, and when the second through hole 40a and the receiving groove 411 are cut off, the first through hole 313a cannot pass through the receiving groove 411 to the first through hole 313a, that is, the valve body 40 and the movable valve 50 are in a blocked state. When the second through hole 40a and the receiving groove 411 are in communication, the first through hole 313a can be in communication with the first through hole 313a through the receiving groove 411, that is, the valve body 40 and the movable valve 50 are in a communication state.

[0114] The valve body 40 is provided with a receiving groove 411, and at least a part 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 extra 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.

[0115] like Figure 5 and Figure 6 As shown, 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 is cut off from the second through hole 40a. In the connected state, the second through hole 40a is connected to the third through hole 50a.

[0116] Optionally, the second through hole 40a can be disposed 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.

[0117] It is understandable that when the second through hole 40a is at least partially aligned with the third through hole 50a, the third through hole 50a and the second through hole 40a can be connected, and then the accommodating cavity 31a is connected to 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 can be cut off, and then the accommodating cavity 31a can be sealed.

[0118] The movable valve 50 can be arranged to switch between the connected state and the blocked state with respect to the accommodating groove 411 by means of plugging and pulling movements, or the movable valve 50 can be arranged to switch between the connected state and the blocked state with respect to the accommodating groove 411 by means of rotational movement. The specific selection can be made according to actual needs.

[0119] Optionally, the number of the second through holes 40a may be one or more, and similarly, the number of the third through holes 50a may be one or more, and the number of the second through holes 40a may be equal to or different from the number of the first through holes 313a.

[0120] 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 .

[0121] 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.

[0122] like Figure 5 , Figure 6 and Figure 7 As shown, 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 .

[0123] Thus, the third through hole 50a and the second through hole 40a are located at the sides of the movable valve 50 and the valve body 40 respectively, 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.

[0124] The second through hole 40a is disposed on the first side wall 4111 to facilitate the connection or cutoff 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 blocking state and the connecting state.

[0125] like Figure 5 , Figure 8 and Fig. 9 As shown, 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 .

[0126] 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.

[0127] It is understandable 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, and helps to improve the smoothness of electrolyte injection during the process of injecting electrolyte into the battery cell 30.

[0128] In some embodiments, the active 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.

[0129] Thus, in the connected state, at least one third through hole 50a is connected with at least one second through hole 40a, that is, multiple third through holes 50a can be provided to be connected with multiple second through holes 40a respectively, or one third through hole 50a is connected with multiple second through holes 40a, or multiple third through holes 50a are connected with one second through hole 40a. In the blocked state, none of the third through holes 50a is connected with any of the second through holes 40a. The movement angle or displacement of the movable valve 50 relative to the valve body 40 can be set as needed to control the connection area between the third through hole 50a and the second through hole 40a. In the connected state, during the formation of the battery cell 30, it is convenient to control the discharge rate of the gas in the accommodating cavity 31a, and during the injection of the battery cell 30, it is convenient to control the injection rate.

[0130] In some embodiments, the number of the third through holes 50a is equal to the number of the second through holes 40a. In the connected state, the second through holes 40a are connected to the third through holes 50a one by one.

[0131] 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 between 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 50a 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.

[0132] like Fig.10 , Fig.11 and Fig.12 As shown, in some embodiments, the movable valve 50 is rotatably connected to the valve body 40 .

[0133] 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 conversion between the two.

[0134] In some embodiments, the valve body 40 and the first wall 313 are integrally formed.

[0135] This is helpful to simplify the structure of the battery cell 30 and reduce the manufacturing difficulty of the battery cell 30 .

[0136] like Figure 5 and Figure 6 As shown, in some embodiments, the movable valve 50 and the third through hole 50a are disposed through the first through hole 313a.

[0137] In this way, at least part of the movable valve 50 is disposed in the first through hole 313a and connected to the first wall 313, which is conducive to improving the connection reliability between the movable valve 50 and the first wall 313, and further improving the structural reliability of the battery cell 30. In addition, since the third through hole 50a is disposed in the first through hole 313a, the gas in the accommodating chamber 31a can be discharged through the second through hole 40a during the process of being discharged through the first through hole 313a, without contacting the first wall 313, which is conducive to reducing the risk of the gas, water vapor or injected electrolyte in the accommodating chamber 31a corroding the first wall 313.

[0138] The battery 10 provided according to an embodiment of the present application includes the battery cell 30 provided in any of the above embodiments.

[0139] The battery 10 provided in the embodiment of the present application has the same technical effect as the battery cell 30 provided in any of the above embodiments, and thus will not be described in detail here.

[0140] The electrical device provided according to the 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.

[0141] The electric device provided in the embodiment of the present application has the same technical effect 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.

[0142] like Figures 5 to 12 As shown, in some embodiments, the battery cell 30 provided in the embodiment of the present application includes a shell 31, a valve body 40 and a movable valve 50, the shell 31 has a receiving chamber 31a and a first wall 313, the first wall 313 has a first through hole 313a, and the first through hole 313a communicates with the receiving chamber 31a and the outside of the battery cell 30. The valve body 40 is connected to the first wall 313, the valve body 40 has a receiving groove 411 and a second through hole 40a, the receiving groove 411 communicates with 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, at least part of the movable valve 50 is located in the receiving groove 411, the movable valve 50 has a third through hole 50a, the third through hole 50a communicates with the outside 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 be rotatable relative to the valve body 40 so that the movable valve 50 and the valve body 40 are switched between a blocking state and a communicating state. In the blocking state, the third through hole 50a is cut off from the second through hole 40a, and in the communicating state, the third through hole 50a is communicated with the second through hole 40a. The accommodating groove 411 has an opening 411a and a first side wall 4111 adjacent to the opening 411a, and the second through hole 40a is penetrated 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, and the number of the third through holes 50a is equal to the number of the second through holes 40a. In the blocking state, any third through hole 50a is cut off from any second through hole 40a, and in the communicating state, the second through holes 40a are communicated with the third through holes 50a one by one.

[0143] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that: include: 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 the housing cavity with 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 blocked, and 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, characterized in that: The valve body has a receiving groove, the receiving groove is connected to the first through hole and the second through hole, and at least a part of the movable valve is located in the receiving groove.

3. The battery cell according to claim 2, characterized in that: The movable valve has a third through hole, and the third through hole is connected to the outside 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.

4. The battery cell according to claim 3, characterized in that: The containing 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, characterized in that: The containing 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, characterized in that: 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, and 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, characterized in that: 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, characterized in that: The movable valve is rotatably connected to the valve body.

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

10. The battery cell according to claim 3, characterized in that: The movable valve and the third through hole are disposed through the first through hole.

11. A battery, characterized in that: The invention comprises a battery cell as claimed in any one of claims 1 to 10.

12. An electrical device, characterized in that: The invention comprises 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.

Images