Top cover assembly, battery cell, battery, and electric device

Abstract

A top cover assembly, a battery cell, a battery, and an electric device, relating to the technical field of batteries. The top cover assembly comprises a top cover, a first magnetic member, a filter screen and a second magnetic member; the top cover is provided with an electrolyte injection hole; the first magnetic member is mounted on the top cover; the filter screen is mounted on the top cover and covers the electrolyte injection hole; the second magnetic member is movably mounted in the filter screen; the first magnetic member and the second magnetic member are oppositely arranged in the axial direction of the electrolyte injection hole; the second magnetic member is configured to be attracted by the first magnetic member to abut against the top cover to seal the electrolyte injection hole.

Description

Top cover assembly, battery cell, battery and electrical device

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application is based on the Chinese patent application with application number: 202410244917.X and application date of March 4, 2024, and claims the priority of the Chinese patent application. The entire content of the Chinese patent application is hereby introduced into this application as a reference. Technical Field

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

[0004] In recent years, new energy vehicles have developed by leaps and bounds. In the field of electric vehicles, power batteries play an irreplaceable and important role as the power source of electric vehicles. In general power batteries, due to the unreasonable structure of the top cover assembly, the quality of the battery cells is low and the quality is poor. For example, when injecting electrolyte into the shell of the battery cell, the injection nozzle is usually placed on the top of the shell, and the injection nozzle is placed against the injection hole to inject liquid, and then the injection nozzle is lifted after injection. At this time, the electrolyte on the injection nozzle will inevitably drip around the injection hole, causing electrolyte contamination to the battery cell. The electrolyte contamination greatly affects the quality and quality of the subsequent sealing nail welding. For example, in the sealing nail welding process, the battery cell is at normal pressure, and it is impossible to ensure that the battery cell is in a negative pressure environment during welding. The battery cell retains less gas during the later charge and discharge cycle, which greatly affects the life of the battery.

[0005] Summary of the Invention

[0006] The present application provides a top cover assembly, a battery cell, a battery, and an electrical device to improve the efficiency and quality of the battery cell.

[0007] In a first aspect, an embodiment of the present application provides a top cover assembly, which is applied to a battery, and the top cover assembly includes: a top cover, a first magnetic part, a filter and a second magnetic part; the top cover is provided with an injection hole; the first magnetic part is installed on the top cover; the filter is installed on the top cover and covers the injection hole; the second magnetic part can be movably installed in the filter, the first magnetic part and the second magnetic part are arranged opposite to each other along the axial direction of the injection hole, and the second magnetic part is configured to be adsorbed by the first magnetic part to stop the top cover to seal the injection hole.

[0008] In the above technical solution, by providing a first magnetic member and a second magnetic member, and movably installing the second magnetic member in the filter, the second magnetic member can slide between the filter and the top cover. When the second magnetic member is located at a position avoiding the liquid injection hole and the mesh holes on the filter, the internal environment of the battery cell and the external environment can be connected, which is convenient for liquid injection or vacuuming; when the second magnetic member is at a position that stops at the top cover, the internal environment of the battery cell and the external environment can be isolated, thereby improving the sealing of the battery cell and reducing the probability of electrolyte leakage or air intake of the battery cell destroying the negative pressure internal environment. When injecting liquid into a battery cell equipped with this top cover assembly, the battery cell can be turned upside down, and the injection nozzle can be extended from the bottom and placed against the injection hole to inject liquid. If the electrolyte pressure is greater than the adsorption force between the first magnetic part and the second magnetic part, the second magnetic part will be pushed up to the bottom of the filter. At this time, the electrolyte passes through the mesh of the filter under the action of pressure to enter the battery cell. After the injection is completed, before the injection nozzle leaves, the pressure inside the battery cell needs to be reduced. When the electrolyte pressure is less than the adsorption force between the first magnetic part and the second magnetic part, the second magnetic part is again adsorbed onto the first magnetic part to seal the injection hole. At this time, the electrolyte will not leak even if the injection nozzle is removed. Taking a step back, even if the electrolyte leaks, it will drip onto the workbench without causing electrolyte contamination on the battery cell, thereby improving the superiority and quality of subsequent sealing nail welding and improving the yield rate of the battery cell.

[0009] In some embodiments, the top cover includes: a top cover body and a top bracket, the top cover body, the first magnetic part and the top bracket are stacked in sequence, the injection hole passes through the top cover body and the top bracket in sequence along the stacking direction, and the second magnetic part is configured to be adsorbed by the first magnetic part to stop the surface of the top bracket away from the first magnetic part.

[0010] In some embodiments, at least one of the top cover body and the top bracket is provided with a first groove on surfaces facing each other, and the first magnetic member is installed in the first groove.

[0011] In some embodiments, a second groove is provided on a surface of the top bracket facing away from the first magnetic member. When the second magnetic member is adsorbed and stops against the top bracket, the second magnetic member is located in the second groove.

[0012] In some embodiments, a projection of the inner wall of the filter along the axial direction of the second groove covers the bottom of the second groove.

[0013] In some embodiments, the bottom of the second groove is provided with at least one circle of protrusions surrounding the injection hole, and the second magnetic member is used to stop the protrusions.

[0014] In some embodiments, the first magnetic member is annular and is disposed around the liquid injection hole.

[0015] In some embodiments, a projected area of ​​the first magnetic member along the axial direction of the liquid injection hole is S1, and an area of ​​the liquid injection hole is S0, satisfying: 0.1≤S1 / S0≤10.

[0016] In some embodiments, a projected area of ​​the second magnetic member along the axial direction of the liquid injection hole is S2, and an area of ​​the liquid injection hole is S0, satisfying: 1.05≤S2 / S0≤10.

[0017] In some embodiments, the second magnet is loosely coupled to the filter screen.

[0018] In some embodiments, one of the first magnetic member and the second magnetic member is a magnet, and the other is a ferromagnetic material.

[0019] In a second aspect, an embodiment of the present application provides a battery cell, comprising: a shell, a battery cell, and a top cover assembly as described in any one of the above; the battery cell is disposed in the shell; and the top cover assembly is installed in the opening of the shell.

[0020] In some embodiments, the pressure within the housing is less than atmospheric pressure.

[0021] In a third aspect, an embodiment of the present application provides a method for processing a battery cell as in the above embodiment, comprising:

[0022] Place the battery cell to be injected with the injection hole facing downwards;

[0023] docking the liquid injection nozzle with the liquid injection hole, injecting liquid into the liquid injection hole through the liquid injection nozzle, and separating the second magnetic member from the first magnetic member;

[0024] When the injection is completed, the pressure is released so that the second magnetic member is attracted to the first magnetic member.

[0025] In this battery cell processing method, since the top cover assembly of the battery cell is provided with a first magnetic part and a second magnetic part, and the second magnetic part is movably installed in the filter, the second magnetic part can slide between the filter and the top cover. When the second magnetic part is located at a position avoiding the injection hole and the mesh holes on the filter, the internal environment of the battery cell and the external environment can be connected, which is convenient for injection or vacuuming; when the second magnetic part is at a position that stops at the top cover, the internal environment of the battery cell and the external environment can be isolated, thereby improving the sealing of the battery cell and reducing the probability of electrolyte leakage or air intake of the battery cell destroying the negative pressure internal environment.

[0026] In some embodiments, after releasing the pressure when the injection is completed so that the second magnetic member is attracted to the first magnetic member, the processing method further includes:

[0027] Place the battery cell with the injection hole facing upward;

[0028] Extending the top post into the liquid injection hole to push the second magnetic member to a position separated from the first magnetic member;

[0029] evacuating the battery cell through the injection hole;

[0030] When the target pressure is reached, the top column is retracted to allow the second magnetic member to be attracted to the first magnetic member;

[0031] A sealing nail is installed at the liquid injection hole.

[0032] In a fourth aspect, an embodiment of the present application provides a battery, comprising: a plurality of battery cells as described in any one of the above.

[0033] In a fifth aspect, an embodiment of the present application provides an electrical device, comprising: a battery as described above, wherein the battery is used to provide electrical energy to the electrical device. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0035] FIG1 is a schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0036] FIG2 is an exploded view of the structure of a battery provided in some embodiments of the present application;

[0037] FIG3 is a schematic structural diagram of a battery cell provided in some embodiments of the present application;

[0038] FIG4 is a schematic structural diagram of a top cover assembly provided in some embodiments of the present application;

[0039] FIG5 is a top view of a top cover assembly provided in some embodiments of the present application;

[0040] FIG6 is a cross-sectional view of a point AA in FIG5;

[0041] FIG7 is a partial enlarged view of FIG6;

[0042] FIG8 is a second cross-sectional view of the section AA in FIG5 ;

[0043] FIG9 is a partial enlarged view of FIG8;

[0044] FIG10 is one of the structural schematic diagrams of the first magnetic member and the second magnetic member provided in some embodiments of the present application;

[0045] FIG11 is a second schematic diagram of the structure of the first magnetic member and the second magnetic member provided in some embodiments of the present application.

[0046] FIG12 is a schematic diagram of an inverted battery cell structure provided by some embodiments of the present application;

[0047] FIG13 is a bottom view of a battery cell provided in some embodiments of the present application;

[0048] FIG14 is a cross-sectional view at BB in FIG13;

[0049] FIG15 is a schematic diagram of sealing pin welding provided by some embodiments of the present application;

[0050] FIG16 is a top view of a sealing pin welding method according to some embodiments of the present application;

[0051] FIG17 is a cross-sectional view of a portion CC in FIG16;

[0052] FIG18 is a flow chart of a method for processing a battery cell provided in some embodiments of the present application.

[0053] Figure numerals: Vehicle 1, battery 10, box body 11, first box body 111, second box body 112, battery cell 12; Top cover assembly 13, top cover 131, liquid injection hole 1311, top cover body 1312, top bracket 1313, first groove 1314, second groove 1315, first magnetic part 132, filter 133, second magnetic part 134; Shell 14, top column 151, exhaust chamber 152, motor 20, controller 30. DETAILED DESCRIPTION

[0054] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0055] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are for the purpose of describing specific embodiments only 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 drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary-secondary relationship.

[0056] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0057] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0058] The term "and / or" in this application simply describes an association between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0059] The term "multiple" in this application 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).

[0060] The battery cells mentioned in the embodiments of this application may include lithium-ion secondary battery cells, lithium-ion primary battery cells, lithium-sulfur battery cells, sodium-lithium-ion battery cells, sodium-ion battery cells, or magnesium-ion battery cells, etc., and the embodiments of this application do not limit this. The battery cells may be cylindrical, flat, rectangular, or other shapes, etc., and the embodiments of this application do not limit this. Battery cells are generally divided into cylindrical battery cells and square battery cells according to the packaging method, and the embodiments of this application do not limit this.

[0061] The battery referred to in the embodiments of this application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in this application may include a battery module or battery pack. A battery generally includes a casing that encloses one or more battery cells or multiple battery modules. The casing prevents liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0062] A battery cell includes a casing, a battery cell, and an electrolyte. The casing is used to hold the battery cell and the electrolyte. The battery cell is composed of a positive electrode sheet, a negative electrode sheet, and a separator. The battery cell mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. The positive electrode sheet includes a positive electrode collector and a positive electrode active material layer. The positive electrode active material layer is coated on the surface of the positive electrode collector. The positive electrode collector not coated with the positive electrode active material layer protrudes from the positive electrode collector coated with the positive electrode active material layer. The positive electrode collector not coated with the positive electrode active material layer serves as the positive electrode tab. Taking lithium-ion batteries as an example, the material of the positive electrode collector can be aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode sheet consists of a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector. The negative current collector uncoated with the negative active material layer protrudes from the negative current collector coated with the negative active material layer. The negative current collector uncoated with the negative active material layer serves as the negative electrode tab. The negative current collector can be made of copper, and the negative active material can be carbon, silicon, or other materials. To ensure that high currents can pass without melting, multiple positive electrode tabs are stacked together, and multiple negative electrode tabs are stacked together.

[0063] The material of the isolation film may be PP (polypropylene) or PE (polyethylene), etc. In addition, the battery core may be a wound structure or a laminated structure, but the embodiments of the present application are not limited thereto.

[0064] New energy vehicles have experienced rapid growth in recent years. Within the electric vehicle sector, power batteries, as the power source, play an irreplaceable and important role. A battery consists of a housing and multiple cells housed within it. As a core component in new energy vehicles, batteries have high requirements for both safety and cycle life.

[0065] The inventors have found that in general power batteries, the unreasonable structure of the top cover assembly leads to low quality and poor quality of the battery cells. For example, when injecting electrolyte into the shell of the battery cell, the injection nozzle is usually placed on the top of the shell, and the injection nozzle is placed against the injection hole to inject the liquid, and then the injection nozzle is lifted after the injection. At this time, the electrolyte on the injection nozzle will inevitably drip around the injection hole, causing electrolyte contamination to the battery cell. The electrolyte contamination greatly affects the quality and quality of the subsequent sealing nail welding. For another example, in the sealing nail welding process, the battery cell is at normal pressure, and it is impossible to ensure that the battery core is in a negative pressure environment during welding. The battery cell retains less gas during the later charge and discharge cycle, which greatly affects the life of the battery.

[0066] Based on the above considerations, in order to reduce electrolyte contamination and improve the efficiency and quality of sealing pin welding, the inventors have conducted in-depth research and designed a top cover assembly, a battery cell, a battery and an electrical device. The top cover assembly is applied to the battery, including: a top cover, a first magnetic part, a filter and a second magnetic part; the top cover is provided with an injection hole; the first magnetic part is installed on the top cover; the filter is installed on the top cover and covers the injection hole; the second magnetic part can be movably installed in the filter, and is configured to be adsorbed by the first magnetic part to the stop cover to seal the injection hole.

[0067] In the top cover assembly of this structure, by providing a first magnetic part and a second magnetic part, and movably installing the second magnetic part in the filter screen, the second magnetic part can slide between the filter screen and the top cover. When the second magnetic part is located in a position avoiding the liquid injection hole and the mesh holes on the filter screen, the internal environment of the battery cell and the external environment can be connected, which is convenient for liquid injection or vacuuming; when the second magnetic part is in a position that stops at the top cover, the internal environment of the battery cell and the external environment can be isolated, thereby improving the sealing of the battery cell. When injecting liquid into a battery cell equipped with this top cover assembly, the battery cell can be turned upside down, and the injection nozzle can be extended from the bottom and placed against the injection hole to inject liquid. If the electrolyte pressure is greater than the adsorption force between the first magnetic part and the second magnetic part, the second magnetic part will be pushed up to the bottom of the filter. At this time, the electrolyte passes through the mesh of the filter under the action of pressure to enter the battery cell. After the injection is completed, before the injection nozzle leaves, the pressure inside the battery cell needs to be reduced. When the electrolyte pressure is less than the adsorption force between the first magnetic part and the second magnetic part, the second magnetic part is again adsorbed onto the first magnetic part to seal the injection hole. At this time, the electrolyte will not leak even if the injection nozzle is removed. Taking a step back, even if the electrolyte leaks, it will drip onto the workbench without causing electrolyte contamination on the battery cell, thereby improving the superiority and quality of subsequent sealing nail welding and improving the yield rate of the battery cell.

[0068] The batteries disclosed in the embodiments of this application can be used, but are not limited to, in electrical devices such as vehicles, ships, or aircraft. A power supply system comprising the battery thermal management system disclosed in this application and batteries can be used to form such electrical devices. This helps expand the scope of application of the battery thermal management system and reduces the difficulty of assembling the battery thermal management system.

[0069] The present invention provides an electrical device that uses a battery as a power source. The electrical device may include, 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, and a spacecraft. 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. The spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft.

[0070] 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.

[0071] As shown in FIG1 , FIG1 is a schematic structural diagram of a vehicle 1 according to an embodiment of the present application. The vehicle 1 may be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A motor 20, a controller 30 and a battery 10 may be provided inside the vehicle 1. The controller 30 is used to control the battery 10 to supply power to the motor 20. For example, a battery 10 may be provided at the bottom, front or rear 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 and for the circuit system of the vehicle 1, for example, for the working power requirements during the startup, navigation and operation of the vehicle 1.

[0072] In another embodiment 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 .

[0073] In order to meet different power requirements, the battery 10 may include a plurality of battery cells 12 , wherein the plurality of battery cells 12 may be connected in series, in parallel, or in hybrid connection, where hybrid connection refers to a mixture of series and parallel connection.

[0074] FIG2 is an exploded view of the structure of a battery 10 according to an embodiment of the present application. The battery 10 includes a housing 11 and a plurality of battery cells 12, which are intended to be housed within the housing 11. The housing 11 is configured to provide assembly space for the battery cells 12, and the housing 11 can have a variety of structures. In some embodiments, the housing 11 can include a first housing body 111 and a second housing body 112, which overlap each other and together define an assembly space for accommodating the battery cells 12. The second housing body 112 can be a hollow structure with one end open. The first housing body 111 can be a plate-like structure, with the first housing body 111 overlapping the open side of the second housing body 112, so that the first housing body 111 and the second housing body 112 jointly define an assembly space. Alternatively, the first housing body 111 and the second housing body 112 can each be a hollow structure with one end open, with the open side of the first housing body 111 overlapping the open side of the second housing body 112. Of course, the box body 11 formed by the first box body 111 and the second box body 112 can be in various shapes, such as a cylinder or a cuboid.

[0075] In the battery 10, the multiple battery cells 12 can be connected in series, in parallel, or in a hybrid connection. A hybrid connection refers to a combination of series and parallel connections within the multiple battery cells 12. The multiple battery cells 12 can be directly connected in series, in parallel, or in a hybrid connection, and then the entire battery 12 can be housed within the housing 11. Alternatively, the battery 10 can be constructed by first connecting multiple battery cells 12 in series, in parallel, or in a hybrid connection to form a module. The multiple battery modules can then be connected in series, in parallel, or in a hybrid connection to form a single unit housed within the housing 11.

[0076] Each battery cell 12 can be a secondary battery or a primary battery, or a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 12 can be flat, rectangular, or in other shapes.

[0077] Battery cells 12 are the smallest units that make up battery 10. They include a housing, a battery cell, and an electrolyte. As shown in Figure 3, the housing includes a top cover assembly 13 and a casing 14. The top cover assembly 13 fits over the opening of the casing 14 to isolate the interior of the battery cell 12 from the outside environment.

[0078] The top cover assembly 13 includes a top cover 131 and a filter 133 . The top cover 131 is provided with an injection hole 1311 for injecting electrolyte. The filter 133 is installed on the top cover 131 and covers the injection hole 1311 . The filter 133 is used to filter the injected electrolyte.

[0079] Without limitation, the shape of the top cover 131 can be adapted to the shape of the housing 14 to match the housing 14. Optionally, the top cover 131 can be made of a material with a certain hardness and strength (such as aluminum alloy). In this way, the top cover 131 is less likely to deform when squeezed or collided, allowing the battery cell 12 to have a higher structural strength and improved reliability. Functional components such as electrode terminals can be provided on the top cover 131. The electrode terminals can be used to electrically connect to the battery cell to output or input electrical energy to the battery cell 12. In some embodiments, the top cover 131 can also be provided with a pressure relief mechanism for relieving internal pressure when the internal pressure or temperature of the battery cell 12 reaches a threshold. The material of the top cover 131 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this embodiment of the present application does not impose any special restrictions on this. In some embodiments, an insulating component can also be provided on the inside of the top cover 131. The insulating component can be used to isolate the electrical connection components in the housing 14 from the top cover 131 to reduce the risk of short circuits. For example, the insulating component may be made of plastic, rubber, etc.

[0080] The housing 14 is a component used to cooperate with the top cover 131 to form an internal environment of the battery cell 12 , wherein the formed internal environment can be used to accommodate battery cells, electrolytes and other components.

[0081] The shell 14 and the top cover 131 can be independent components, and an opening can be provided on the shell 14. The internal environment of the battery cell 12 is formed by covering the opening with the top cover 131. Without limitation, the top cover 131 and the shell 14 can also be integrated. Specifically, the top cover 131 and the shell 14 can form a common connection surface before other components are put into the shell. When the interior of the shell 14 needs to be encapsulated, the top cover 131 is covered with the shell 14. The shell 14 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 14 can be determined according to the specific shape and size of the battery cell. The material of the shell 14 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.

[0082] According to some embodiments of the present application, as shown in Figures 4 and 5, the present application provides a top cover assembly 13, which is applied to a battery 10, and the top cover assembly 13 includes: a top cover 131, a first magnetic part 132, a filter 133 and a second magnetic part 134; the top cover 131 is provided with a liquid injection hole 1311; the first magnetic part 132 is installed on the top cover 131; the filter 133 is installed on the top cover 131 and covers the liquid injection hole 1311; the second magnetic part 134 is movably installed in the filter 133, and the first magnetic part 132 and the second magnetic part 134 are arranged opposite to each other along the axial direction of the liquid injection hole 1311, and are configured to be adsorbed by the first magnetic part 132 to the stop cover 131 to seal the liquid injection hole 1311.

[0083] The top cover 131 is used to cooperate with the housing 14 to form an internal environment of the battery cell 12. The injection hole 1311 connects the internal environment of the battery cell 12 with the external environment.

[0084] The filter 133 covers the injection hole 1311 and is used to filter the electrolyte entering the housing 14 through the injection hole 1311. The filter 133 can be a non-magnetic metal or plastic member. The filter 133 includes multiple meshes, which are spaced apart along the circumference and axial direction. The meshes of the filter 133 can be square, circular, triangular, etc., and their size can be adjusted according to the injection amount.

[0085] The first magnetic member 132 and the second magnetic member 134 can be attracted to each other, and the first magnetic member 132 can be mounted on the top cover 131 by bonding, snapping, or clamping. The first magnetic member 132 and the second magnetic member 134 can both be magnets, or one of the first magnetic member 132 and the second magnetic member 134 can be a magnet and the other can be a ferromagnetic material.

[0086] The first magnetic member 132 and the second magnetic member 134 are arranged opposite to each other along the axial direction of the injection hole 1311 . The first magnetic member 132 is disposed close to the injection hole 1311 so that the movement path of the second magnetic member 134 coincides with the injection hole 1311 .

[0087] The projected area of ​​the second magnetic member 134 along the axial direction of the liquid injection hole 1311 is not less than the area of ​​the liquid injection hole 1311 , so that the liquid injection hole 1311 is blocked when the second magnetic member 134 abuts against the top cover 131 .

[0088] The second magnetic member 134 can slide between the filter screen 133 and the top cover 131. When the second magnetic member 134 is located in a position avoiding the injection hole 1311 and the filter holes on the filter screen 133, the electrolyte can be injected into the shell 14, see Figures 6 and 7; when the second magnetic member 134 is located in a position stopping the top cover 131, the second magnetic member 134 blocks the injection hole 1311 to prevent the electrolyte from flowing out of the injection hole 1311 and causing electrolyte leakage, see Figures 8 and 9.

[0089] The battery cell 12 with the top cover assembly 13 structure can at least realize the inverted liquid injection working condition as shown in Figures 12 to 14 and the upright negative pressure pumping working condition as shown in Figures 15 to 17.

[0090] Inverted injection condition: As shown in Figure 12, the battery cell 12 to be injected is placed with the injection hole 1311 facing downward. When no liquid is injected, the state of the first magnetic member 132 and the second magnetic member 134 is as shown in Figures 8 and 9, and the injection hole 1311 is blocked by the second magnetic member 134. The injection nozzle can extend from the bottom and lean against the injection hole 1311 to inject liquid. If the electrolyte pressure is greater than the adsorption force between the first magnetic member 132 and the second magnetic member 134, the second magnetic member 134 will be pushed up to the bottom of the filter 133 (see Figures 6 and 7). At this time, the electrolyte passes through the mesh of the filter 133 under the action of pressure and enters the battery cell 12. When the pressure in the battery cell 12 returns to normal pressure after the electrolyte is injected, the second magnetic member 134 will be attracted to the first magnetic member 132 again to block the injection hole 1311 to prevent the electrolyte from overflowing, thus completing the injection (see Figures 8 and 9). By inverting the liquid injection, the electrolyte on the liquid injection nozzle will not drip onto the battery cell 12 to cause electrolyte contamination, thereby improving the efficiency and quality of subsequent sealing nail welding and improving the yield of the battery cell 12.

[0091] 1311, and the second magnetic part 134 is again adsorbed onto the first magnetic part 132 to block the liquid injection hole 1311 and ensure the negative pressure in the battery cell 12. After vacuuming, the sealing nails 151 are welded, thereby retaining more gas for the battery cell 12 in the later charge and discharge cycle process, thereby greatly improving the life of the battery 10.

[0092] In the top cover assembly 13 of this structure, by providing a first magnetic part 132 and a second magnetic part 134, and movably installing the second magnetic part 134 in the filter 133, the second magnetic part 134 can slide between the filter 133 and the top cover 131. When the second magnetic part 134 is located in a position avoiding the injection hole 1311 and the mesh holes on the filter 133, the internal environment of the battery cell 12 and the external environment can be connected, which is convenient for injection or vacuuming; when the second magnetic part 134 is in a position that stops at the top cover 131, the internal environment of the battery cell 12 and the external environment can be isolated, thereby improving the sealing of the battery cell 12 and reducing the probability of electrolyte leakage or air intake of the battery cell 12 destroying the negative pressure internal environment.

[0093] When injecting liquid into a battery cell 12 equipped with the top cover assembly 13, the battery cell can be inverted, and the injection nozzle can be extended from the bottom to lean against the injection hole 1311 to inject liquid. When the electrolyte pressure is greater than the adsorption force between the first magnetic member 132 and the second magnetic member 134, the second magnetic member 134 is pushed up to the bottom of the filter 133. At this time, the electrolyte passes through the mesh of the filter 133 under the action of pressure and enters the battery cell 12. After the injection is completed, before the injection nozzle is removed, the pressure inside the battery cell needs to be reduced. When the electrolyte pressure is less than the adsorption force between the first magnetic member 132 and the second magnetic member 134, the second magnetic member 134 is again adsorbed onto the first magnetic member 132 to block the injection hole 1311. At this time, the electrolyte will not leak even if the injection nozzle is removed. Even if the electrolyte leaks, it will drip onto the workbench and will not cause electrolyte contamination on the battery cell 12, thereby improving the quality and efficiency of subsequent sealing pin welding and the yield rate of the battery cell 12.

[0094] In some embodiments, as shown in FIG. 10 and FIG. 11 , the first magnetic member 132 is annular and is disposed around the liquid injection hole 1311 to avoid the liquid injection hole 1311 .

[0095] In some embodiments, the projection of the inner wall of the filter screen 133 along the axial direction of the second groove 1315 covers the bottom of the second groove 1315 .

[0096] The inner wall of the filter 133 is projected along the axial direction of the second groove 1315 to be no less than the bottom of the second groove 1315 , so that the filter 133 completely covers the injection hole 1311 , thereby preventing unfiltered electrolyte from flowing into the battery cell 12 through the gap between the filter 133 and the second groove 1315 , thereby improving the quality of the battery cell 12 .

[0097] In some embodiments, the axial projection of the inner wall of the filter 133 along the second groove 1315 is equal to the bottom of the second groove 1315, so that the second magnetic part 134 can slide smoothly into the second groove 1315 along the axial direction of the filter 133, thereby improving the reliability of the second magnetic part 134 in blocking the injection hole 1311, and can reduce the space of the battery cell 12 occupied by the filter 133 in the radial direction, thereby improving the energy density of the battery cell 12.

[0098] In some embodiments, the second magnet is loosely fitted with the filter screen 133 so that the second magnet can smoothly move along the axial direction of the filter screen 133 .

[0099] As shown in FIG7 and FIG9 , the mesh of the filter screen 133 is located near the top cover 131 to increase the filtering area and speed up the liquid injection speed.

[0100] In some embodiments, the projected area of ​​the first magnetic member 132 along the axial direction of the liquid injection hole 1311 is S1, and the area of ​​the liquid injection hole 1311 is S0, satisfying: 0.1≤S1 / S0≤10.

[0101] The ratio of S1 to S0 may be 0.1, 1, 5, or 10, and may be set according to the usage scenario.

[0102] As shown in FIG. 7 and FIG. 9 , D1 is the diameter of the first magnetic member 132 , D0 is the diameter of the liquid injection hole 1311 , S1 = 0.25π( D12 - D02 ), and S0 = 0.25πD02 .

[0103] By setting the axial area ratio of the first magnetic member 132 and the liquid injection hole 1311 , the adsorption force between the first magnetic member 132 and the second magnetic member 134 can meet the use requirements, thereby increasing reliability.

[0104] In some embodiments, the projected area of ​​the second magnetic member 134 along the axial direction of the liquid injection hole 1311 is S2, and the area of ​​the liquid injection hole 1311 is S0, satisfying: 1.05≤S2 / S0≤10.

[0105] The ratio of S2 to S0 may be 1.05, 3, 5, or 10, and may be set according to the usage scenario.

[0106] As shown in FIG. 7 and FIG. 9 , D2 is the diameter of the second magnetic member 134 , and S2 = 0.25πD22.

[0107] By setting the axial area ratio range of the second magnetic component 134 and the injection hole 1311, the axial projection area of ​​the second magnetic component 134 along the injection hole 1311 is not less than the area of ​​the injection hole 1311, so that the injection hole 1311 is blocked when the second magnetic component 134 stops against the top cover 131.

[0108] In some embodiments, when the second magnetic member 134 abuts against the top cover 131 , the adsorption pressure between the first magnetic member 132 and the second magnetic member 134 is P, which satisfies: 0 MPa<P≤5 MPa.

[0109] The adsorption pressure between the first magnetic member 132 and the second magnetic member 134 can be 1 MPa, 3 MPa or 5 MPa, as long as the following condition is satisfied: negative pressure < adsorption pressure between the first magnetic member 132 and the second magnetic member 134 < injection pressure.

[0110] In some embodiments, as shown in Figures 6 and 7, the top cover 131 includes: a top cover body 1312 and a top bracket 1313, the top cover body 1312, the first magnetic part 132 and the top bracket 1313 are stacked in sequence, the injection hole 1311 passes through the top cover body 1312 and the top bracket 1313 in sequence along the stacking direction, the first magnetic part 132 is clamped between the top cover body 1312 and the top bracket 1313, and the second magnetic part 134 is configured to be adsorbed by the first magnetic part 132 to the surface of the top bracket 1313 that is away from the first magnetic part 132.

[0111] The top cover body 1312 and the top bracket 1313 may be non-magnetic metal parts or plastic parts to reduce interference with the moving path of the second magnetic part 134 .

[0112] One end point of the movement of the second magnetic member 134 is the surface of the top bracket 1313 away from the first magnetic member 132 , and the other end point is the inner end surface of the filter 133 opposite to the surface of the top bracket 1313 away from the first magnetic member 132 .

[0113] The first magnetic member 132 is limited by the top cover body 1312 and the top bracket 1313 .

[0114] In some embodiments, as shown in FIG. 7 and FIG. 9 , at least one of the top cover body 1312 and the top bracket 1313 has a first groove 1314 on surfaces facing each other, and the first magnetic member 132 is installed in the first groove 1314 .

[0115] Among them, the top cover body 1312 and the top bracket 1313 define a first groove 1314, the first groove 1314 can be set on the top cover body 1312, the first groove 1314 can also be set on the top bracket 1313, or the first groove 1314 can also be partially set on the top cover body 1312 and partially set on the top bracket 1313.

[0116] The diameter of the first slot 1314 is not less than the diameter of the first magnetic member 132 , so as to facilitate the installation of the first magnetic member 132 .

[0117] In some embodiments, as shown in Figures 7 and 9, a second groove 1315 is provided on the surface of the top bracket 1313 facing away from the first magnetic member 132. When the second magnetic member 134 is adsorbed onto the abutting top bracket 1313, the second magnetic member 134 is located in the second groove 1315.

[0118] Among them, the bottom of the second groove 1315 is the end point of the travel of the second magnetic part 134, and the diameter of the second groove 1315 is not less than the diameter of the second magnetic part 134, so that the second magnetic part 134 can smoothly stop against the top bracket 1313, thereby blocking the injection hole 1311.

[0119] The second groove 1315 can help lower the height of the filter 133 and reduce the space occupied by the filter 133 in the axial direction of the battery cell 12, thereby improving the energy density of the battery cell 12 and preventing the filter 133 from hitting the battery cell and causing damage to the battery cell.

[0120] In some embodiments, the bottom of the second groove 1315 is provided with at least one circle of protrusions surrounding the injection hole 1311 , and the second magnetic member 134 is used to stop the protrusions.

[0121] The protrusion may be one or more circles. When the second magnetic member 134 abuts against the protrusion, stress concentration is formed at the protrusion. Compared with the surface contact seal, the sealing pressure of the line contact seal at the protrusion is greater, thereby improving the reliability of the seal.

[0122] In some embodiments, the top bracket 1313 is a plastic part, and the structural rigidity of the protrusion is small. When the second magnetic part 134 stops against the protrusion, the stress at the protrusion is concentrated and deformation occurs, thereby forming a smaller surface seal with the second magnetic part 134, thereby improving the reliability of the seal.

[0123] According to some embodiments of the present application, the present application also provides a battery cell 12 comprising: a shell 14 , a battery cell and any one of the above-mentioned top cover assemblies 13 , wherein the battery cell is disposed in the shell 14 and the top cover assembly 13 is installed at an opening of the shell 14 .

[0124] Any of the above-mentioned top cover assemblies 13 can achieve the conduction or blocking of the liquid injection hole 1311 by the movement of the second magnetic member 134, so that the battery cell 12 equipped with the top cover assembly 13 has a high yield and a long service life.

[0125] In some embodiments, the pressure within the housing 14 is less than atmospheric pressure, so that the battery cells 12 can retain more gas during later charge and discharge cycles, greatly improving the life of the battery 10.

[0126] According to some embodiments of the present application, as shown in FIG18 , the present application further provides a method for processing a battery cell 12 , including: step 100 , step 200 , and step 300 .

[0127] Step 100 : Place the battery cell 12 to be filled with liquid so that the filling hole 1311 faces downward.

[0128] In this step, the battery cell 12 is placed upside down with the opening of the injection hole 1311 facing downward. When no liquid is injected, the first magnetic member 132 and the second magnetic member 134 are in the state shown in Figures 8 and 9, and the injection hole 1311 is blocked by the second magnetic member 134.

[0129] In step 200 , the liquid injection nozzle is docked with the liquid injection hole 1311 , and liquid is injected into the liquid injection hole 1311 through the liquid injection nozzle, and the second magnetic member 134 is separated from the first magnetic member 132 .

[0130] In this step, the liquid injection nozzle can be extended from the bottom and leaned against the liquid injection hole 1311 to inject liquid. If the electrolyte pressure is greater than the adsorption force between the first magnetic part 132 and the second magnetic part 134, the second magnetic part 134 will be pushed up to the bottom of the filter 133, see Figures 6 and 7. At this time, the electrolyte passes through the mesh of the filter 133 under the action of pressure to enter the battery cell 12.

[0131] In step 300 , after the injection is completed, the pressure is released so that the second magnetic member 134 and the first magnetic member 132 are attracted to each other.

[0132] In this step, when the electrolyte is injected and the pressure is released, the pressure inside the battery cell 12 becomes normal pressure, and the second magnetic member 134 is again adsorbed onto the first magnetic member 132 to block the injection hole 1311 to ensure that the electrolyte does not overflow, thereby completing the injection, see Figures 8 and 9.

[0133] In this embodiment, the electrolyte on the injection nozzle is prevented from dripping onto the battery cell 12 and causing electrolyte contamination by inverting the injection nozzle, thereby improving the efficiency and quality of subsequent sealing nail welding and the yield of the battery cell 12.

[0134] In this processing method of the battery cell 12, since the top cover assembly 13 of the battery cell 12 is provided with a first magnetic part 132 and a second magnetic part 134, and the second magnetic part 134 is movably installed in the filter 133, the second magnetic part 134 can slide between the filter 133 and the top cover 131. When the second magnetic part 134 is located in a position avoiding the injection hole 1311 and the mesh holes on the filter 133, the internal environment of the battery cell 12 and the external environment can be connected, which is convenient for injection or vacuuming; when the second magnetic part 134 is in a position that stops at the top cover 131, the internal environment of the battery cell 12 and the external environment can be isolated, thereby improving the sealing of the battery cell 12 and reducing the probability of electrolyte leakage or air intake of the battery cell 12 destroying the negative pressure internal environment.

[0135] In some embodiments, after step 300 , the method for processing the battery cell 12 further includes:

[0136] Place the battery cell 12 with the liquid injection hole 1311 facing upward.

[0137] In this step, as shown in FIGS. 15 and 16 , the battery cell 12 is upright, with the injection hole 1311 facing upward, the top cover 131 of the battery cell 12 facing upward, and the injection hole 1311 blocked by the second magnetic member 134 .

[0138] The top post 151 is inserted into the liquid injection hole 1311 to push the second magnetic member 134 to a position separated from the first magnetic member 132 .

[0139] In this step, the top column 151 and the air extraction cavity 152 are pressed onto the liquid injection hole 1311 , and the top column 151 presses down the second magnetic member 134 until it reaches the bottom of the filter screen 133 , as shown in FIG. 17 .

[0140] The battery cell 12 is degassed through the liquid injection hole 1311 .

[0141] In this step, the air extraction chamber 152 extracts the air in the battery cell 12 to create a negative pressure in the battery cell 12 . The magnitude of the negative pressure can be determined according to the actual needs of the battery cell 12 .

[0142] When the target pressure is reached, the top column 151 is retracted to allow the second magnetic member 134 to be attracted to the first magnetic member 132 .

[0143] In this step, when the target pressure is reached, the top column 151 can be retracted, and the second magnetic member 134 is again attracted to the first magnetic member 132 to block the liquid injection hole 1311 and ensure the negative pressure in the battery cell 12 .

[0144] The target pressure is a pressure value determined according to the actual requirements of the battery cell 12 .

[0145] A sealing pin is installed at the liquid injection hole 1311.

[0146] In this step, the sealing pins are welded after vacuuming. At this time, the second magnetic member 134 is located in the second groove 1315, so that the battery cell 12 can retain more gas during the subsequent charge and discharge cycle, greatly improving the life of the battery 10.

[0147] According to some embodiments of the present application, the present application further provides a battery 10 comprising a plurality of the above-mentioned battery cells 12 .

[0148] The battery cells 12 have the advantages of high yield and long life, so the battery 10 including the battery cells 12 has high yield and long life.

[0149] According to some embodiments of the present application, the present application further provides an electrical device, comprising the battery 10 of any of the above solutions, and the battery 10 is used to provide electrical energy to the electrical device.

[0150] The power-consuming device may be any of the aforementioned devices or systems using the battery 10 .

[0151] The battery 10 has a high yield rate and a long lifespan, so an electrical device including the battery 10 can reduce the frequency of replacing the battery 10 and reduce the cost.

[0152] According to some embodiments of the present application, the battery cell 12 having the structure of the top cover assembly 13 can at least realize the inverted liquid injection working condition as shown in Figures 12 to 14 and the upright negative pressure pumping working condition as shown in Figures 15 to 17.

[0153] Inverted injection condition: As shown in Figures 12 and 14, the battery cell 12 is inverted. When no liquid is injected, the states of the first magnetic member 132 and the second magnetic member 134 are as shown in Figures 8 and 9. The first magnetic member 132 is located in the first groove 1314, the second magnetic member 134 is located in the second groove 1315, and the injection hole 1311 is blocked by the second magnetic member 134. The injection nozzle can extend from the bottom and lean against the injection hole 1311 to inject liquid. If the electrolyte pressure is greater than the adsorption force between the first magnetic member 132 and the second magnetic member 134, the second magnetic member 134 will be pushed up to the bottom of the filter 133, see Figures 6 and 7; at this time, the electrolyte passes through the mesh of the filter 133 under the action of pressure and enters the battery cell 12. After the electrolyte is completely injected and the pressure within the battery cell 12 returns to normal, the second magnetic member 134 is again attracted to the first magnetic member 132 to prevent the electrolyte from overflowing, thus completing the injection process. See Figures 8 and 9 , where the second magnetic member 134 is now located in the second groove 1315. By inverting the injection process, electrolyte from the injection nozzle is prevented from dripping onto the battery cell 12 and contaminating it. This improves the efficiency and quality of subsequent sealing pin welding, thereby increasing the yield rate of the battery cell 12.

[0154] Positive negative pressure pumping condition: As shown in Figures 15 and 16, the battery cell 12 is placed upright, with the top cover 131 of the battery cell 12 facing upward. The top column 151 and the vacuum chamber 152 are pressed onto the injection hole 1311. The top column 151 presses the second magnetic member 134 down to the bottom of the filter 133 (see Figure 17). Then, the vacuum chamber 152 extracts the air from the battery cell 12, creating a negative pressure inside the battery cell 12. The magnitude of the negative pressure can be determined based on the actual needs of the battery cell 12. When the target pressure is reached, the top column 151 can be retracted, and the second magnetic member 134 is again adsorbed onto the first magnetic member 132 to block the injection hole 1311 and ensure the negative pressure inside the battery cell 12. After vacuuming, the sealing pins are welded. At this point, the second magnetic member 134 is located in the second groove 1315, allowing the battery cell 12 to retain more gas during the subsequent charge and discharge cycles, greatly improving the life of the battery 10.

[0155] It should be noted that, unless there is any conflict, the embodiments and features in the embodiments of this application can be combined with each other.

[0156] The above are merely preferred embodiments of the present application and are not intended to limit the present application. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A top cover assembly, characterized in that: Applied to a battery, the top cover assembly includes: A top cover, wherein the top cover is provided with a liquid injection hole; a first magnetic member, the first magnetic member being mounted on the top cover; a filter screen, the filter screen being mounted on the top cover and covering the liquid injection hole; The second magnetic member is movably mounted in the filter screen, the first magnetic member and the second magnetic member are arranged opposite to each other along the axial direction of the liquid injection hole, and the second magnetic member is configured to be adsorbed by the first magnetic member to stop the top cover to block the liquid injection hole.

2. The top cover assembly according to claim 1, wherein: The top cover includes: a top cover body and a top bracket, the top cover body, the first magnetic part and the top bracket are stacked in sequence, the injection hole passes through the top cover body and the top bracket in sequence along the stacking direction, and the second magnetic part is configured to be adsorbed by the first magnetic part to stop the surface of the top bracket away from the first magnetic part.

3. The top cover assembly according to claim 2, wherein: At least one of the top cover body and the top bracket is provided with a first groove on surfaces facing each other, and the first magnetic member is installed in the first groove.

4. The top cover assembly according to claim 2 or 3, characterized in that: A second groove is provided on a surface of the top bracket facing away from the first magnetic member. When the second magnetic member is adsorbed and stops against the top bracket, the second magnetic member is located in the second groove.

5. The top cover assembly according to claim 4, wherein: The projection of the inner wall of the filter along the axial direction of the second groove covers the groove bottom of the second groove.

6. The top cover assembly according to claim 4 or 5, characterized in that: The bottom of the second groove is provided with at least one circle of protrusions surrounding the injection hole, and the second magnetic member is used to stop the protrusions.

7. The top cover assembly according to any one of claims 2 to 6, characterized in that: The first magnetic member is annular and is arranged around the liquid injection hole.

8. The top cover assembly according to claim 7, wherein: The projected area of ​​the first magnetic member along the axial direction of the liquid injection hole is S1, and the area of ​​the liquid injection hole is S0, which satisfies: 0.1≤S1 / S0≤10.

9. The top cover assembly according to any one of claims 1 to 8, characterized in that: The projected area of ​​the second magnetic member along the axial direction of the liquid injection hole is S2, and the area of ​​the liquid injection hole is S0, satisfying: 1.05≤S2 / S0≤10.

10. The top cover assembly according to any one of claims 1 to 9, characterized in that: The second magnet is loosely fitted with the filter screen.

11. The top cover assembly according to any one of claims 1 to 10, characterized in that: One of the first magnetic member and the second magnetic member is a magnet, and the other is a ferromagnetic material.

12. A battery cell, characterized in that: include: case; a battery cell, the battery cell being disposed in the housing; The top cover assembly according to any one of claims 1 to 11, wherein the top cover assembly is mounted on the opening of the shell.

13. The battery cell according to claim 12, characterized in that: The pressure inside the housing is less than atmospheric pressure.

14. A method for processing a battery cell according to claim 12 or 13, characterized in that: include: Place the battery cell to be injected with the injection hole facing downwards; docking the liquid injection nozzle with the liquid injection hole, injecting liquid into the liquid injection hole through the liquid injection nozzle, and separating the second magnetic member from the first magnetic member; When the injection is completed, the pressure is released so that the second magnetic member is attracted to the first magnetic member.

15. The battery cell processing method according to claim 14, characterized in that: After releasing the pressure when the injection is completed so that the second magnetic member is adsorbed onto the first magnetic member, the processing method further includes: Place the battery cell with the injection hole facing upward; Extending the top post into the liquid injection hole to push the second magnetic member to a position separated from the first magnetic member; evacuating the battery cell through the injection hole; When the target pressure is reached, the top column is retracted to allow the second magnetic member to be attracted to the first magnetic member; A sealing nail is installed at the liquid injection hole.

16. A battery, characterized in that: include: A plurality of battery cells according to claim 12 or 13.

17. An electrical device, characterized in that: include: The battery according to claim 16, wherein the battery is used to provide electrical energy to the electrical device.

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