Battery cell, battery, and electric device

Abstract

A battery cell (7), a battery (2), and an electric device. A liquid injection hole (21) is formed in the battery cell (7), and a liquid injection pressure relief member (6) is provided in the liquid injection hole (21). The liquid injection pressure relief member (6) comprises a cylinder (601) and a push rod assembly (602). The cylinder (601) is arranged at the liquid injection hole (21); a cavity (603) and an opening (604) communicated with the cavity (603) are formed in the cylinder (601); a through hole (605) communicated with the cavity (603) is further formed in the cylinder (601); and the through hole (605) is arranged toward the interior of the battery cell (7). The push rod assembly (602) is arranged in the cavity (603); an end of the push rod assembly (602) is provided with a first positioning portion (606) protruding outward in the circumferential direction; the first positioning portion (606) matches the through hole (605) and seals the through hole (605); and the push rod assembly (602) can move relative to the cylinder (601) to communicate the through hole (605) with the cavity (603) so as to achieve exhaust or liquid injection. The liquid injection pressure relief member (6) is provided in the liquid injection hole (21), and an original liquid injection hole structure (6) on the battery cell (7) can be used, thereby reducing the extra occupied space, simplifying the processing steps, and reducing the processing difficulty. One component achieves both a liquid injection function and an exhaust function, thereby improving the integration level and manufacturing efficiency of the battery cell (7).

Description

Battery cells, batteries, and electrical devices

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application No. 202420072035.5, filed on January 11, 2024, entitled “Battery Cell, Battery, and Electrical Device,” the entire contents of which are incorporated herein by reference. Technical Field

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

[0004] Battery cells are widely used in electronic devices such as mobile phones, laptops, electric bicycles, electric cars, electric airplanes, electric boats, electric toy cars, electric toy boats, electric toy airplanes, power tools, and energy storage systems. Battery cells can include nickel-cadmium battery cells, nickel-metal hydride battery cells, lithium-ion battery cells, sodium-ion battery cells, and secondary alkaline zinc-manganese battery cells.

[0005] With the development of new energy technologies, how to simplify the structure of components in battery cells and improve the integration and manufacturing efficiency of battery cells has also become one of the research focuses in this field.

[0006] Summary of the Invention

[0007] In view of the above problems, the present application provides a battery cell, a battery, and an electrical device, which can improve the integration of the battery cell and enhance the manufacturing efficiency of the battery cell.

[0008] In a first aspect, the present application provides a battery cell having a liquid injection hole, in which a liquid injection pressure relief component is provided. The liquid injection pressure relief component includes a cylinder and a push rod assembly. The cylinder is provided in the liquid injection hole, and the cylinder has a cavity and an opening connected to the cavity. The cylinder is also provided with a through hole connected to the cavity, and the through hole is arranged toward the interior of the battery cell. The push rod assembly is provided in the cavity, and the end of the push rod assembly is provided with a first positioning portion protruding outward along the circumferential direction, the first positioning portion cooperates with the through hole and seals the through hole, and the push rod assembly can move relative to the cylinder to connect the through hole with the cavity to achieve exhaust or liquid injection.

[0009] In the technical solution of the embodiment of the present application, the liquid injection and pressure relief component is set in the liquid injection hole, which can utilize the original liquid injection hole structure on the battery cell, reduce the extra space occupied, simplify the processing steps, and reduce the processing difficulty. A cavity and a through hole are provided on the cylinder to connect the interior of the battery cell with the external environment, and at the same time provide a space for the push rod assembly to move. The push rod assembly can move relative to the cylinder to achieve the sealing and opening of the through hole, which is convenient for injecting liquid into the battery cell or discharging excess gas inside the battery cell. One component can realize the functions of liquid injection and exhaust at the same time, thereby improving the integration and manufacturing efficiency of the battery cell.

[0010] In some embodiments, a sealing ring is provided on the outer periphery of the first positioning portion to seal the first positioning portion against the wall of the through hole. In the above structure, the use of the sealing ring improves the sealing performance between the push rod assembly and the barrel, reduces the risk of external impurities entering the battery cell, improves the operating stability of the battery cell, and extends the cycle life of the battery cell.

[0011] In some embodiments, the liquid injection pressure relief member further comprises a piston assembly, which is disposed on the side of the first positioning portion facing the cavity. Driven by the push rod, the piston assembly moves relative to the through hole, thereby connecting the through hole with the cavity. In the above structure, the provision of the piston assembly improves the sealing performance between the push rod assembly and the cylinder, and the provision of the piston assembly can also improve the efficiency of the movement of the push rod assembly relative to the cylinder.

[0012] In some embodiments, the piston assembly includes a piston ring and a sealing portion. The piston ring is provided in the through hole, and the piston ring is located on the side of the first positioning portion facing the cavity, and a first channel is formed between the piston ring and the hole wall of the through hole. The sealing portion is formed by protruding outward along the circumference of the piston ring, and the sealing portion is located on the inner side of the piston ring facing the cavity. In the above structure, by setting a first channel between the piston ring and the hole wall, the piston ring moves upward relative to the cylinder, and the sealing portion is separated from the cylinder to form a channel, which is connected to the first channel to achieve communication between the cavity and the through hole. At this time, the liquid injection pressure relief component is opened, which can facilitate the discharge of gas inside the battery cell.

[0013] In some embodiments, the piston assembly further comprises a first seal, which is provided on the side of the sealing portion facing the cylinder. The above structure can improve the sealing performance between the sealing portion and the cylinder, and ensure the sealing of the battery cell before the liquid injection pressure relief member is opened.

[0014] In some embodiments, the push rod assembly includes a positioning ring, a rod body, a first elastic member, and a second elastic member. The positioning ring is formed to protrude outward along the inner wall of the cylinder, and the positioning ring has a center hole. The rod body is arranged in the cavity, the rod body passes through the center hole, the first positioning portion is arranged at one end of the rod body, and the other end of the rod body is provided with a second positioning portion protruding along the circumferential direction. The first elastic member is arranged between the positioning ring and the first positioning portion, and the first elastic member can be extended and retracted along the axial direction of the rod body. The second elastic member is arranged between the positioning ring and the second positioning portion, and the second elastic member can be extended and retracted along the axial direction of the rod body. In particular, the first elastic member and the second elastic member work together to limit the movement of the rod body relative to the cylinder body. In the above structure, a positioning ring is provided to limit the positions of the first elastic member and the second elastic member, thereby improving the stability of the structure and improving the efficiency of the movement of the push rod assembly relative to the cylinder; the first elastic member is provided to limit the movement of the rod body toward the inside of the battery cell, and the second elastic member is provided to limit the movement of the rod body toward the outside of the battery cell. By providing the elastic force of the first elastic member and the second elastic member, under the joint action of the first elastic member and the second elastic member, the movement of the rod body relative to the cylinder is limited, thereby maintaining the stability of the position of the rod body.

[0015] In some embodiments, a second channel is formed between the piston ring and the rod. In the above structure, by providing the second channel between the piston ring and the rod, the piston ring moves downward relative to the cylinder, separating from the first positioning portion and forming a channel. This channel then communicates with the second channel, establishing communication between the through-hole and the interior of the battery cell. At this point, the liquid injection pressure relief member is opened, facilitating liquid injection into the liquid injection pressure relief member.

[0016] In some embodiments, the piston assembly further includes a second seal disposed between the piston ring and the first positioning portion. In the aforementioned structure, the provision of the second seal improves the sealing performance between the piston ring and the first positioning portion, thereby ensuring the sealing of the battery cell before the injection pressure relief member is opened.

[0017] In a second aspect, the present application provides a battery comprising the battery cell in the above embodiment.

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

[0019] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The features, advantages and technical effects of exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

[0021] FIG1 is a schematic structural diagram of a vehicle according to an embodiment of the present application;

[0022] FIG2 is a schematic diagram of the exploded structure of a battery according to an embodiment of the present application;

[0023] FIG3 is a schematic structural diagram of a battery cell according to an embodiment of the present application;

[0024] FIG4 is a schematic structural diagram of a liquid injection and pressure relief component according to an embodiment of the present application;

[0025] FIG5 is a schematic structural diagram of a liquid injection and pressure relief component according to another embodiment of the present application;

[0026] FIG6 is a schematic structural diagram of a liquid injection pressure relief component in a closed state according to an embodiment of the present application;

[0027] FIG7 is a schematic structural diagram of a liquid injection pressure relief component in a liquid injection state according to an embodiment of the present application;

[0028] FIG8 is a structural diagram of a liquid injection pressure relief component in an exhaust state according to an embodiment of the present application.

[0029] Detailed description of the accompanying drawings: 1. vehicle; 2. battery; 10. electrode assembly; 20. shell; 21. liquid injection hole; 22. accommodating chamber; 30. end cover; 40. shell; 3. controller; 4. motor; 5. box; 51. first part; 52. second part; 53. accommodating space; 6. liquid injection and pressure relief component; 601. cylinder; 602. push rod assembly; 603. cavity; 604. opening; 605. through hole; 606. first positioning part; 607. sealing ring; 608. piston assembly; 609. piston ring; 610. sealing part; 611. first channel; 612. first sealing member; 613. positioning ring; 614. rod body; 615. first elastic member; 616. second elastic member; 617. center hole; 618. second positioning part; 619. second channel; 620. second sealing member; 7. battery cell. DETAILED DESCRIPTION

[0030] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0032] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0033] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0034] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0035] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0036] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0037] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0038] The present invention provides an electric device that uses a battery as a power source. The electric device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery-powered vehicle, an electric car, a ship, a spacecraft, etc. 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, etc. The spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0039] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device according to an embodiment of the present application.

[0040] Please refer to Figure 1, which is a schematic diagram of the structure of the vehicle provided in some embodiments of the present application. Vehicle 1 can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 2 is provided inside the vehicle 1, and the battery 2 can be provided at the bottom, head or tail of the vehicle 1. The battery 2 can be used to power the vehicle 1. For example, the battery 2 can serve as an operating power source for the vehicle 1. The vehicle 1 can also include a controller 3 and a motor 4. The controller 3 is used to control the battery 2 to power the motor 4, for example, for starting, navigating and driving the vehicle 1.

[0041] In some embodiments of the present application, the battery 2 can serve not only as an operating power source for the vehicle 1 , but also 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 .

[0042] In some embodiments, the battery 2 may be an energy storage device, including an energy storage container, an energy storage cabinet, and the like.

[0043] Please refer to Figure 2, which is an exploded view of a battery provided in some embodiments of the present application. Battery 2 includes a housing 5 and a battery cell 7, with battery cell 7 housed within housing 5. Housing 5 is used to accommodate battery cell 7 and can adopt a variety of structures.

[0044] In some optional embodiments, the housing 5 includes a first portion 51 and a second portion 52, which cover each other and together define a storage space 53 for accommodating the battery cells 7. The second portion 52 may be a hollow structure with one end open, and the first portion 51 may be a plate-like structure, with the first portion 51 covering the open side of the second portion 52, so that the first portion 51 and the second portion 52 together define the storage space 53. The first portion 51 and the second portion 52 may also be hollow structures with one end open, with the open side of the first portion 51 covering the open side of the second portion 52. Of course, the housing 5 formed by the first portion 51 and the second portion 52 can have various shapes, such as a cylinder, a rectangular parallelepiped, etc.

[0045] In some embodiments, the box 5 can serve as part of the chassis structure of the vehicle 1. For example, part of the box 5 can become at least part of the floor of the vehicle 1, or part of the box 5 can become at least part of the crossbeam and longitudinal beam of the vehicle 1.

[0046] In battery 2, there may be multiple battery cells 7, which may be connected in series, in parallel, or in a hybrid configuration. A hybrid configuration refers to a combination of series and parallel connections within the battery cells 7. Multiple battery cells 7 may be directly connected in series, in parallel, or in a hybrid configuration, and then the entire battery cell 7 is housed within the housing 5. Alternatively, battery 2 may be constructed by first connecting multiple battery cells 7 in series, in parallel, or in a hybrid configuration to form a battery module. The multiple battery modules are then connected in series, in parallel, or in a hybrid configuration to form a single unit, which is then housed within the housing 5. Battery 2 may also include other structures, such as a busbar assembly for electrically connecting the multiple battery cells 7.

[0047] Each battery cell 7 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 7 can be cylindrical, flat, rectangular, or in other shapes.

[0048] Please refer to Figure 3, which is a schematic diagram of the structure of a battery cell 7 provided in one embodiment of the present application. A battery cell 7 is the smallest unit that makes up a battery 2. As shown in Figure 3, a battery cell 7 includes a housing 40, an electrode assembly 10, and other functional components.

[0049] The housing 40 is a component for accommodating the electrode assembly 10. The housing 40 has a receiving cavity 22, in which the electrode assembly can be disposed. The housing 40 can be made of a variety of materials, such as copper, iron, aluminum, steel, and aluminum alloys. The housing 40 can have a variety of shapes, such as a cylinder or a rectangular parallelepiped. The exemplary housing 40 in the figure is cylindrical.

[0050] The outer shell 40 may include an end cap 30 and a shell 20. The end cap 30 refers to a component that covers the opening of the shell 20 to isolate the internal environment of the battery cell 7 from the external environment. Without limitation, the shape of the end cap 30 can be adapted to the shape of the shell 20 to match the shell 20. Optionally, the end cap 30 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 30 is not easily deformed when squeezed or collided, so that the battery cell 7 can have a higher structural strength and the safety performance can also be improved. Functional components such as 50, electrode lead-out parts 50, etc. can be provided on the end cap 30. The electrode lead-out part 50 can be used to be electrically connected to the electrode assembly 10 for outputting or inputting electrical energy of the battery cell 7.

[0051] In some embodiments, the end cap 30 may also be provided with a liquid injection hole 21, and a pressure relief mechanism may be provided in the liquid injection hole 21 to relieve internal pressure. The end cap 30 may also be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this embodiment of the present application does not impose any particular restrictions on this. In some embodiments, an insulating component may also be provided on the inner side of the end cap 30. The insulating component may be used to isolate the electrical connection portion 61 in the housing 20 from the end cap 30 to reduce the risk of short circuits. Exemplarily, the insulating component may be plastic, rubber, etc.

[0052] The housing 20 is a component that cooperates with the end caps 30 to form the internal environment of the battery cell 7. This internal environment can accommodate the electrode assembly 10, electrolyte, and other components. The housing 20 and end caps 30 can be separate components. An opening can be provided in the housing 20, and the end caps 30 can be placed over the opening to form the internal environment of the battery cell 7.

[0053] In some optional embodiments, the end cap 30 and the shell 20 can also be integrated. Specifically, the end cap 30 and the shell 20 can form a common connection surface before other components are put into the shell. When the interior of the shell 20 needs to be encapsulated, the end cap 30 is covered with the shell 20. The shell 20 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the shell 20 can be determined according to the specific shape and size of the electrode assembly 10. The material of the shell 20 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not impose any special restrictions on this.

[0054] The electrode assembly 10 is the component in the battery cell 7 where the electrochemical reaction occurs. One or more electrode assemblies 10 may be contained within the housing 20. The electrode assembly 10 includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell 7, active ions (such as lithium ions) are embedded in and released from the positive and negative electrodes. The separator is provided between the positive and negative electrodes to prevent short circuits between the positive and negative electrodes while allowing active ions to pass through.

[0055] In some embodiments, the separator is a separator. This application does not specifically limit the type of separator; any known porous separator with good chemical and mechanical stability can be used. For example, the separator can be made primarily of at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic.

[0056] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transport ions and isolate the positive and negative electrodes.

[0057] In some embodiments, the battery cell 7 further 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 may be selected based on needs. The electrolyte may be liquid, gel, or solid.

[0058] With the development of battery technology, people have placed higher demands on the integration and assembly efficiency of battery cells. Typically, the outer shell is equipped with an injection hole for injecting liquid electrolyte into the shell. In addition, the battery cell is also equipped with a pressure relief mechanism. When the air pressure inside the battery cell exceeds a threshold, the pressure relief mechanism opens a valve to release the internal substances to ensure the balance of air pressure inside the battery cell, reducing the risk of explosion or combustion of the battery cell.

[0059] The embodiment of the present application improves the above-mentioned structure by setting the liquid injection pressure relief component in the liquid injection hole of the battery cell. It can utilize the original liquid injection hole structure on the battery cell, reduce the extra space occupied, simplify the processing steps, and reduce the processing difficulty. The cylinder is provided with a cavity and a through hole, which connects the interior of the battery cell with the external environment and provides a movable space for the push rod assembly. The push rod assembly can move relative to the cylinder to achieve the sealing and opening of the through hole, which is convenient for injecting liquid into the battery cell or discharging excess gas inside the battery cell. One component can realize the functions of liquid injection and exhaust at the same time, thereby improving the integration and manufacturing efficiency of the battery cell.

[0060] The following detailed description of the battery cell of an embodiment of the present application is provided in conjunction with the accompanying drawings. Please refer to Figures 3 to 6. Figure 3 is a schematic structural diagram of a battery cell according to an embodiment of the present application. Figure 4 is a schematic structural diagram of a liquid injection pressure relief component according to an embodiment of the present application. Figure 5 is a schematic structural diagram of a liquid injection pressure relief component according to another embodiment of the present application. Figure 6 is a schematic structural diagram of a liquid injection pressure relief component according to an embodiment of the present application in a closed state.

[0061] As shown in Figures 3 and 4, the battery cell 7 of the embodiment of the present application has a liquid injection hole 21, and a liquid injection pressure relief component 6 is arranged in the liquid injection hole 21. The liquid injection pressure relief component 6 includes a cylinder 601 and a push rod assembly 602. The cylinder 601 is arranged in the liquid injection hole 21, and has a cavity 603 and an opening 604 connected to the cavity 603. The cylinder 601 is also provided with a through hole 605 connected to the cavity 603, and the through hole 605 is arranged toward the interior of the battery cell 7. The push rod assembly 602 is arranged in the cavity 603. The end of the push rod assembly 602 is provided with a first positioning portion 606 protruding outward along the circumferential direction. The first positioning portion 606 cooperates with the through hole 605 and seals the through hole 605. The push rod assembly 602 can move relative to the cylinder 601 to connect the through hole 605 with the cavity 603 to achieve exhaust or liquid injection.

[0062] In the technical solution of the embodiment of the present application, the liquid injection and pressure relief component 6 is set in the liquid injection hole 21, which can utilize the original liquid injection hole 21 structure on the battery cell 7, reduce the extra space occupied, simplify the processing steps, and reduce the processing difficulty. The cylinder 601 is provided with a cavity 603 and a through hole 605, which connects the interior of the battery cell 7 with the external environment and provides a movable space for the push rod assembly 602. The push rod assembly 602 can move relative to the cylinder 601 to achieve the sealing and opening of the through hole 605, which is convenient for injecting liquid into the battery cell 7 or discharging excess gas inside the battery cell 7. One component can realize the functions of liquid injection and exhaust at the same time, thereby improving the integration and manufacturing efficiency of the battery cell 7.

[0063] Exemplarily, the injection hole 21 is provided on the outer shell 40 of the battery cell 7, and can be provided on the end cover 30. The cylinder 601 and the push rod assembly 602 can be made of a metal material with a certain structural strength to ensure the sealing performance and the stability of the connection with the outer shell 40. The through hole 605 of the cylinder 601 extends into the interior of the battery cell 7 and is connected to the accommodating cavity 22 of the outer shell 40, and can discharge the gas generated by the battery cell 7 during operation. The opening 604 is provided on the side of the outer shell 40 away from the accommodating cavity 22, connecting the cavity 603 with the external environment. The push rod assembly 602 can be manually pushed to open the injection pressure relief component 6 to achieve exhaust or injection, and other components can also be provided to control the movement of the push rod assembly 602.

[0064] As shown in FIG5 , in some embodiments of the present application, a sealing ring 607 is provided on the outer periphery of the first positioning portion 606, and the sealing ring 607 is used to achieve a seal between the first positioning portion 606 and the hole wall of the through hole 605. Optionally, the sealing ring 607 and the cylinder 601 are in an interference fit. In the above structure, the use of the sealing ring 607 improves the sealing performance between the push rod assembly 602 and the cylinder 601, reduces the risk of external impurities entering the interior of the battery cell 7, improves the operating stability of the battery cell 7, and extends the cycle life of the battery cell 7.

[0065] In some optional embodiments, the liquid injection pressure relief member 6 further includes a first elastic member 615, a second elastic member 616, and a positioning ring 613. The positioning ring 613 is formed to protrude along the inner wall of the cylinder 601 toward the cavity 603. The positioning ring 613 has a center hole 617. The first elastic member 615 and the second elastic member 616 are disposed within the cylinder 601. The positioning ring 613 is disposed between the first elastic member 615 and the second elastic member 616. The push rod assembly 602 passes through the center hole 617 of the positioning ring 613. The push rod assembly 602 further includes a second positioning portion 618 at one end away from the first positioning portion 606. The first elastic member 615 is disposed between the first positioning portion 606 and the positioning ring 613, and the second elastic member 616 is disposed between the second positioning portion 618 and the positioning ring 613. The first elastic member 615 and the second elastic member 616 have a rebound force. Under the action of the first elastic member 615 and the second elastic member 616 , the movement of the push rod assembly 602 relative to the cylinder 601 is restricted.

[0066] In the above structure, a positioning ring 613 is provided to limit the positions of the first elastic member 615 and the second elastic member 616, thereby improving the stability of the structure and improving the efficiency of the push rod assembly 602 moving relative to the cylinder 601; the first elastic member 615 is provided to limit the movement of the push rod assembly 602 toward the inside of the battery cell 7, and the second elastic member 616 is provided to limit the movement of the push rod assembly 602 toward the outside of the battery cell 7. By setting the elastic force of the first elastic member 615 and the second elastic member 616, under the joint action of the first elastic member 615 and the second elastic member 616, the movement of the push rod assembly 602 relative to the cylinder 601 is limited, and the position of the push rod assembly 602 is kept stable.

[0067] At the same time, when an external force acts on push rod assembly 602, as long as the external force is greater than the rebound force of first elastic member 615 or second elastic member 616, push rod assembly 602 is pushed, opening through hole 605 and connecting the interior of battery cell 7 with the external environment. This simple structure is easy to operate and highly efficient. When the external force is removed, push rod assembly 602 can return to its original position, ensuring the sealing performance of the interior of battery cell 7, enabling repeated use, high filling and exhaust efficiency, and long service life.

[0068] As shown in FIG6 , in some embodiments of the present application, the liquid injection pressure relief member 6 further includes a piston assembly 608. The piston assembly 608 is disposed on the side of the first positioning portion 606 facing the cavity 603. Driven by the push rod, the piston assembly 608 moves relative to the through hole 605 and connects the through hole 605 with the cavity 603. In the above structure, the provision of the piston assembly 608 improves the sealing performance between the push rod assembly 602 and the cylinder 601. The provision of the piston assembly 608 can also improve the efficiency of the movement of the push rod assembly 602 relative to the cylinder 601 and the sealing performance.

[0069] In some embodiments of the present application, the piston assembly 608 includes a piston ring 609 and a sealing portion 610. The piston ring 609 is disposed in the through-hole 605 and is located on the side of the first positioning portion 606 facing the cavity 603. A first channel 611 is formed between the piston ring 609 and the wall of the through-hole 605. The sealing portion 610 is formed to protrude outward along the circumference of the piston ring 609 and is located on the inner side of the piston ring 609 facing the cavity 603.

[0070] In the above structure, a first channel 611 is formed between the piston ring 609 and the hole wall. The piston ring 609 moves upward relative to the cylinder 601, and the sealing part 610 is separated from the cylinder 601 to form a channel. The channel is connected to the first channel 611 to achieve communication between the cavity 603 and the through hole 605. At this time, the liquid injection and pressure relief component 6 is opened, which can facilitate the discharge of the internal gas of the battery cell 7.

[0071] In some embodiments of the present application, the piston assembly 608 further includes a first sealing member 612, which is disposed on the side of the sealing portion 610 facing the cylinder 601. This structure can improve the sealing performance between the sealing portion 610 and the cylinder 601, ensuring the sealing of the battery cell 7 before the liquid injection pressure relief member 6 is opened.

[0072] In some embodiments of the present application, the push rod assembly 602 includes a positioning ring 613, a rod 614, a first elastic member 615, and a second elastic member 616. The positioning ring 613 protrudes outward from the inner wall of the cylinder 601 and has a center hole 617. The rod 614 is disposed in the cavity 603 and passes through the center hole 617. A first positioning portion 606 is disposed at one end of the rod 614, and a second positioning portion 618 protrudes circumferentially at the other end of the rod 614. The first elastic member 615 is disposed between the positioning ring 613 and the first positioning portion 606 and is capable of extending and contracting along the axial direction of the rod 614. The second elastic member 616 is disposed between the positioning ring 613 and the second positioning portion 618 and is capable of extending and contracting along the axial direction of the rod 614. The first elastic member 615 and the second elastic member 616 work together to restrict movement of the rod 614 relative to the cylinder 601.

[0073] In the above structure, a positioning ring 613 is provided to limit the positions of the first elastic member 615 and the second elastic member 616, thereby improving the stability of the structure and improving the efficiency of the push rod assembly 602 moving relative to the cylinder 601; the first elastic member 615 is provided to limit the movement of the rod body 614 toward the inside of the battery cell 7, and the second elastic member 616 is provided to limit the movement of the rod body 614 toward the outside of the battery cell 7. By providing the elastic force of the first elastic member 615 and the second elastic member 616, under the joint action of the first elastic member 615 and the second elastic member 616, the movement of the rod body 614 relative to the cylinder 601 is limited, and the position of the rod body 614 is kept stable.

[0074] In some optional embodiments, the first elastic member 615 includes a first spring, and the second elastic member 616 includes a second spring. The springs are standard parts and are easy to obtain. The above structure can improve assembly and production efficiency.

[0075] In some optional embodiments, the positioning ring 613 and the cylinder 601 are an integrally formed structure. The above structure can improve the assembly efficiency of the push rod assembly 602 and improve the positioning accuracy of the first elastic member 615 and the second elastic member 616.

[0076] In some embodiments of the present application, a second channel 619 is formed between the piston ring 609 and the rod body 614. In the above structure, by providing the second channel 619 between the piston ring 609 and the rod body 614, the piston ring 609 moves downward relative to the cylinder 601, separating the piston ring 609 from the first positioning portion 606 and forming a channel. The channel is connected to the second channel 619, thereby achieving communication between the through hole 605 and the interior of the battery cell 7. At this time, the liquid injection pressure relief member 6 is opened, which can facilitate the liquid injection operation of the liquid injection pressure relief member 6.

[0077] In some embodiments of the present application, the piston assembly 608 further includes a second seal 620, which is disposed between the piston ring 609 and the first positioning portion 606. In the above structure, the provision of the second seal 620 improves the sealing performance between the piston ring 609 and the first positioning portion 606, thereby ensuring the sealing of the battery cell 7 before the liquid injection pressure relief member 6 is opened.

[0078] 6 to 8, the process of liquid injection or pressure relief of the liquid injection and pressure relief component 6 according to the embodiment of the present application will be described in detail. The liquid injection and pressure relief component 6 has three states: closed state, liquid injection state, and exhaust state.

[0079] As shown in Figure 6, in the closed state, the second elastic member 616 is in a pre-tightened state when installed to the cylinder 601, so it has a certain rebound force, and the two ends of the second elastic member 616 respectively abut between the positioning ring 613 and the second positioning portion 618, which can limit the movement of the rod body 614 toward the inside of the battery cell 7; at the same time, the first elastic member 615 is in a pre-tightened state when installed to the cylinder 601, so it has a certain rebound force, and the two ends of the first elastic member 615 abut between the positioning ring 613 and the piston ring 609, which can limit the movement of the rod body 614 toward the outside of the battery cell 7.

[0080] By reasonably setting the pre-compression amount of the first elastic member 615 and the second elastic member 616, they have a certain rebound force. The interaction between the two can ensure that the position of the rod body 614 relative to the cylinder 601 is fixed, ensuring that the liquid injection pressure relief component 6 is in a closed state, and ensuring the airtightness of the battery cell 7.

[0081] As shown in Figure 7, during the liquid injection phase, the battery cell 7 requires vacuuming, liquid extraction, liquid injection, liquid replenishment, or formation. During this phase, liquid flows from the exterior of the cylinder 601 toward the interior of the battery cell 7. The injection nozzle of the liquid injection device can be used to apply low pressure to the rod 614, causing the entire rod 614 to move toward the interior of the battery cell 7. The movement of the rod 614 compresses the second elastic member 616, simultaneously driving the piston assembly 608 downward. The piston ring 609 separates from the first positioning portion 606 and the second sealing member 620, forming a channel. The second channel 619 communicates with the interior of the battery cell 7. The injected liquid enters the cylinder 601 through the opening 604, then flows through the cavity 603, from which it flows into the second channel 619. Finally, it exits through the channel between the piston ring 609 and the first positioning portion 606 and enters the interior of the battery cell 7, completing the liquid injection or replenishment process.

[0082] When the fluid replenishment is completed, the low pressure of the injection nozzle on the rod body 614 is cancelled, and the rebound force of the second elastic member 616 pushes the second positioning portion 618 in the direction away from the positioning ring 613 to reduce the pressure, and the rod body 614 moves toward the opening 604. The connection between the piston ring 609 and the first positioning portion 606 is sealed, and the second channel 619 is blocked to realize the closure of the injection pressure relief component 6.

[0083] As shown in Figure 8, in the exhaust state, the internal pressure of the battery cell 7 exceeds the threshold, exerting pressure on the rod 614, pushing the rod 614 from the interior of the battery cell 7 toward the opening 604. At this time, the rod 614 compresses the first elastic member 615. The sealing portion 610 on the piston ring 609 disengages from the cylinder 601, and the first sealing member 612 is disconnected from the cylinder 601 to form a channel. Gas enters from the first channel 611, flows through the channel between the first sealing member 612 and the cylinder 601, and flows into the cavity 603. It continues to flow outward and is discharged from the opening 604. After the excess gas is discharged, the exhaust of the battery cell 7 is completed.

[0084] When the gas in the battery cell 7 is discharged, the air pressure decreases, and the internal air pressure on the rod body 614 decreases. The elastic force of the first elastic member 615 pushes the rod body 614 toward the interior of the battery cell 7, the sealing portion 610 fits against the inner wall of the cylinder 601, and the first channel 611 is blocked, thereby closing the valve body.

[0085] In the above embodiment, the liquid injection and pressure relief member 6 can be used to replenish or vent the battery cell 7 multiple times. After the pressure relief or venting is completed, the liquid injection and pressure relief member 6 can automatically return to its original closed state. The above structure can also replace the pressure relief mechanism in conventional technology, reducing the number of parts and improving production efficiency. In addition, it can be reused multiple times, improving the efficiency of liquid injection and venting, while extending the cycle life of the battery cell 7 and improving the convenience of maintenance.

[0086] The embodiment of the present application provides a battery 2, which includes the battery cell 7 in the above embodiment. The embodiment of the present application also provides an electrical device, which includes the battery in the above embodiment, and the battery 2 is used to provide electrical energy. The battery 2 and the electrical device of the present application both include the battery cell 7 in the above embodiment, which sets the liquid injection pressure relief component 6 in the liquid injection hole 21, and can utilize the original liquid injection hole 21 structure on the battery cell 7 to reduce the additional space occupied, simplify the processing steps, and reduce the processing difficulty. The cylinder 601 is provided with a cavity 603 and a through hole 605, which connects the interior of the battery cell 7 with the external environment and provides a movable space for the push rod assembly 602. The push rod assembly 602 can move relative to the cylinder 601 to achieve the sealing and opening of the through hole 605, which facilitates the injection of liquid into the battery cell 7 or the discharge of excess gas inside the battery cell 7. One component simultaneously realizes the functions of liquid injection and exhaust, thereby improving the integration and manufacturing efficiency of the battery cell 7.

[0087] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery cell (7) has a liquid injection hole (21), and a liquid injection and pressure relief member (6) is provided in the liquid injection hole (21). The liquid injection and pressure relief member (6) includes: A cylinder body (601) is provided in the liquid injection hole (21). The cylinder body (601) has a cavity (603) and an opening (604) communicating with the cavity (603). A through hole (605) communicating with the cavity (603) is further provided on the cylinder body (601), and the through hole (605) is arranged towards the inside of the battery cell (7). A push rod assembly (602) is provided in the cavity (603). An end of the push rod assembly (602) is provided with a first positioning portion (606) protruding outward in the circumferential direction. The first positioning portion (606) cooperates with the through hole (605) to seal the through hole (605), and the push rod assembly (602) can move relative to the cylinder body (601) to communicate the through hole (605) with the cavity (603) to realize exhaust or liquid injection.

2. The battery cell (7) according to claim 1, wherein, A sealing ring (607) is provided on the outer circumference of the first positioning portion (606), and the sealing ring (607) is used to realize the seal between the first positioning portion (606) and the hole wall of the through hole (605).

3. The battery cell (7) according to claim 1, wherein, The liquid injection and pressure relief member (6) further includes a piston assembly (608). The piston assembly (608) is provided on the side of the first positioning portion (606) facing the cavity (603). The piston assembly (608) moves relative to the through hole (605) under the drive of the push rod and communicates the through hole (605) with the cavity (603).

4. The battery cell (7) according to claim 3, wherein, The piston assembly (608) includes: A piston ring (609) is provided in the through hole (605), and the piston ring (609) is located on the side of the first positioning portion (606) facing the cavity (603). A first channel (611) is formed between the piston ring (609) and the hole wall of the through hole (605). A sealing portion (610) protrudes outward in the circumferential direction of the piston ring (609), and the sealing portion (610) is located on the inner side of the piston ring (609) facing the cavity (603).

5. The battery cell (7) according to claim 4, wherein, The piston assembly (608) further includes a first seal (612), and the first seal (612) is provided on the side of the sealing portion (610) facing the cylinder body (601).

6. The battery cell (7) according to claim 4 or 5, wherein, The push rod assembly (602) includes: A positioning ring (613) protrudes outward from the inner wall of the cylinder body (601), and the positioning ring (613) has a central hole (617). A rod body (614) is provided in the cavity (603). The rod body (614) passes through the central hole (617). The first positioning portion (606) is provided at one end of the rod body (614), and a second positioning portion (618) protruding in the circumferential direction is provided at the other end of the rod body (614). A first elastic member (615) is disposed between the positioning ring (613) and the first positioning portion (606), and the first elastic member (615) can axially expand and contract along the rod body (614); A second elastic member (616) is disposed between the positioning ring (613) and the second positioning portion (618), and the second elastic member (616) can axially expand and contract along the rod body (614); Wherein, the first elastic member (615) and the second elastic member (616) act together to limit the movement of the rod body (614) relative to the cylinder body (601).

7. The battery cell (7) according to claim 6, wherein, A second channel (619) is formed between the piston ring (609) and the rod body (614).

8. The battery cell (7) according to claim 7, wherein, The piston assembly (608) further includes a second seal (620), and the second seal (620) is disposed between the piston ring (609) and the first positioning portion (606).

9. A battery (2) comprising a battery cell (7) according to any one of claims 1-8.

10. An electrical device, the electrical device comprising the battery (2) according to claim 9, the battery (2) being configured to provide electrical energy.

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