Battery cell, battery and electric device

Abstract

The embodiment of the utility model provides a battery monomer, a battery and a power utilization device, and relates to the technical field of batteries. The battery monomer comprises an end cover, a first sealing element and a second sealing element, the end cover is provided with a first surface and a second surface which are opposite to each other, and a liquid injection hole penetrating through the end cover along a first direction; the first sealing element is hermetically connected to the liquid injection hole and partially protrudes out of the first surface; the second sealing piece is connected to the first surface and provided with a containing structure used for containing the part, protruding out of the first surface, of the first sealing piece. The accommodating structure is arranged on the second sealing element, the part, protruding out of the first surface, of the first sealing element can be accommodated, interference of the part, protruding out of the first surface, of the first sealing element on installation of the second sealing element is reduced, and the positioning accuracy of the second sealing element when the second sealing element is installed on the end cover and the connection stability after installation are improved.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and more specifically, to a battery cell, a battery, and an electrical device. Background Art

[0002] Battery monomers are widely used in electronic devices, such as mobile phones, laptop computers, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes and electric tools, etc.

[0003] During the production process of batteries, it is necessary to install sealing pins on the end covers of battery cells to seal the injection holes. How to improve the installation efficiency of the sealing pins on battery cells is a research direction in battery technology. Utility Model Content

[0004] The present application provides a battery cell, a battery and an electrical device, which can improve the connection stability between a sealing pin and an end cover on the battery cell.

[0005] In the first aspect, the embodiment of the present application provides a battery cell, including an end cap, a first seal and a second seal; the end cap has a first surface and a second surface opposite to each other, and a liquid injection hole penetrating the end cap along a first direction, the first direction being parallel to the arrangement direction from the first surface to the second surface; the first seal is sealed and connected to the liquid injection hole, and partially protrudes from the first surface; the second seal is connected to the first surface, and the second seal is provided with a receiving structure, the receiving structure is used to receive the portion of the first seal protruding from the first surface. By providing the receiving structure on the second seal, the portion of the first seal protruding from the first surface can be received, thereby reducing the interference of the portion of the first seal protruding from the first surface with the installation of the second seal, and improving the positioning accuracy of the second seal when it is installed on the end cap and the connection stability after installation.

[0006] In some embodiments, along the first direction, the second sealing member has a third surface and a fourth surface opposite to each other, the third surface is connected to the first surface, and the accommodating structure includes a first groove arranged on the third surface. By forming the accommodating structure in the first groove on the third surface, the structure is simple and easy to process.

[0007] In some embodiments, the first groove is recessed from the third surface in a direction away from the first surface, and a first protrusion is formed on the fourth surface opposite to the first groove. By designing the first groove to form a first protrusion on the fourth surface, the recessed depth of the first groove can be increased, so that its accommodation space is correspondingly increased, and the portion of the first sealing member protruding from the first surface can be better accommodated.

[0008] In some embodiments, the inner wall surface of the first groove is an arc surface and / or the outer surface of the first protrusion is an arc surface. By designing the first groove as an arc surface structure, when the second mounting member is assembled, the arc surface has a certain guiding effect on the portion of the first sealing member protruding from the first surface, which can reduce the friction and damage between the portion of the first sealing member protruding from the first surface and the inner wall surface of the first groove; similarly, the first protrusion of the arc surface is also conducive to the installation of structures such as an insulating sheet on the second sealing member.

[0009] In some embodiments, along a second direction intersecting the first direction, the maximum dimension of the first groove is greater than or equal to the maximum dimension of the injection hole. By designing the dimension of the first groove in the second direction to be greater than or equal to the dimension of the injection hole in the second direction, while satisfying that the dimension of the first groove in the second direction is greater than or equal to the dimension of the first sealing member, the portion of the first sealing member protruding from the first surface can enter the first groove.

[0010] In some embodiments, along the second direction, the maximum dimension of the first groove is greater than the maximum dimension of the injection hole, and the difference between the maximum dimension of the first groove and the maximum dimension of the injection hole is in the range of 0.1-1 mm. By designing the dimension of the first groove in the second direction to be greater than the dimension of the injection hole in the second direction, and the difference between the two is in the range of 0.1-1 mm, while facilitating the first sealing member in the injection hole to enter the first groove, the dimension and space occupied by the first groove are reduced, and the tightness of the connection between the first groove and the protruding portion of the first sealing member is improved.

[0011] In some embodiments, the first surface is provided with a first positioning structure, the second sealing member is provided with a second positioning structure, and the first positioning structure and the second positioning structure are positioned and matched. Through the positioning and matching of the first positioning structure and the second positioning structure, the accuracy of the positioning and matching of the second sealing member and the end cover can be further improved, so as to improve the assembly efficiency of the second sealing member and the stability after installation.

[0012] In some embodiments, the first positioning structure includes a second groove, and the second positioning structure includes a second protrusion. The second protrusion and the second groove cooperate to improve the assembly efficiency and stability of the second seal after installation, and the structure is simple and easy to process and assemble.

[0013] In some embodiments, the second groove is an annular groove, and the second protrusion is an annular protrusion; and / or, the second groove and the second protrusion are connected by welding. Accurate positioning can be achieved through the cooperation of the annular groove and the annular protrusion.

[0014] In some embodiments, along the first direction, the maximum groove depth of the second groove is greater than or equal to the maximum protrusion height of the second protrusion. By designing the groove depth of the second groove to be greater than or equal to the maximum protrusion height of the second protrusion, it is easy for the second protrusion to enter the second groove, further improving the assembly efficiency of the two, and thus improving the installation efficiency of the second seal.

[0015] In some embodiments, along the first direction, the maximum groove depth of the second groove is greater than the maximum protrusion height of the second protrusion, and the difference between the maximum groove depth of the second groove and the maximum protrusion height of the second protrusion is 0.01-0.5 mm. By designing the groove depth of the second groove to be greater than the protrusion height of the second protrusion, and designing the difference between the two to be 0.01-0.5 mm, the tightness of the two after connection can be improved while facilitating the assembly connection of the two.

[0016] In some embodiments, along a second direction intersecting the first direction, the maximum groove width of the second groove is greater than or equal to the maximum width of the second protrusion. By designing the groove width of the second groove to be greater than or equal to the width of the second protrusion, it is possible to facilitate the second protrusion to enter the second groove, thereby improving the assembly efficiency of the two, and further improving the installation efficiency of the second seal.

[0017] In some embodiments, along the second direction, the maximum groove width of the second groove is greater than the maximum width of the second protrusion, and the difference between the maximum groove width of the second groove and the maximum width of the second protrusion is 0.05-0.5 mm. By designing the groove width of the second groove to be greater than the width of the second protrusion, and designing the difference between the two to be 0.05-0.5 mm, the tightness of the connection between the two can be improved while facilitating the assembly connection between the two.

[0018] In a second aspect, an embodiment of the present application further provides a battery, comprising a battery cell as described in any one of the above technical solutions.

[0019] In a third aspect, an embodiment of the present application further provides an electrical device, comprising the above-mentioned battery, and the battery is used to provide electrical energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the drawings without paying creative work.

[0021] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0022] Figure 2 A schematic diagram of the structure of a battery provided in some embodiments of the present application;

[0023] Figure 3 A schematic diagram of the structure of a battery cell provided in some embodiments of the present application before the second sealing member is installed;

[0024] Figure 4 A schematic diagram of the structure of a battery cell provided in some embodiments of the present application after a second sealing member is installed;

[0025] Figure 5 A schematic diagram of the structure of an end cover, a first seal and a second seal of a battery cell provided in some embodiments of the present application;

[0026] Figure 6 A schematic diagram of the structure of a second sealing member of a battery cell provided in some embodiments of the present application;

[0027] Figure 7 A cross-sectional view of a second sealing member of a battery cell provided in some embodiments of the present application;

[0028] Figure 8 A cross-sectional view of an end cap of a battery cell provided in some embodiments of the present application;

[0029] Fig. 9 A cross-sectional view of a battery cell after the second seal and the end cover are connected according to some embodiments of the present application.

[0030] The reference numerals of the specific embodiments are as follows:

[0031] 1000. Vehicles;

[0032] 100. Battery;

[0033] 10. Box body; 11. First part; 12. Second part;

[0034] 20. Battery cell; 21. End cap; 211. First surface; 2111. First positioning structure; 21111. Second groove; 212. Second surface; 213. Liquid injection hole; 22. Shell; 23. Pressure relief mechanism; 24. Electrode terminal; 25. First sealing member; 26. Second sealing member; 261. Accommodating structure; 2611. First groove; 2612. First protrusion; 262. Third surface; 263. Fourth surface; 264. Second positioning structure; 2641. Second protrusion;

[0035] 200, controller;

[0036] 300, motor;

[0037] X, first direction; Y, second direction. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0039] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. 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 and secondary relationship.

[0040] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0041] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0042] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0043] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0044] The term "plurality" used in the present application refers to two or more (including two).

[0045] In the present application, the battery cell may include a lithium-ion secondary battery cell, a lithium-ion primary battery cell, a lithium-sulfur battery cell, a sodium-lithium-ion battery cell, a sodium-ion battery cell or a magnesium-ion battery cell, etc., and the embodiments of the present application do not limit this. The battery cell may be cylindrical, flat, rectangular or other shapes, etc., and the embodiments of the present application do not limit this.

[0046] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in the present application may include a battery module or a battery pack. The battery generally includes a box for encapsulating one or more battery cells. The box can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells.

[0047] The battery cell mentioned in the embodiments of the present application may include an electrode assembly and an electrolyte, and the electrode assembly includes 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 current collector and a positive active material layer, and the positive active material layer is coated on the surface of the positive current collector; the positive current collector includes a positive electrode coating area and a positive electrode ear connected to the positive electrode coating area, the positive electrode coating area is coated with a positive electrode active material layer, and the positive electrode ear is not coated with a positive electrode active material layer. Taking a lithium-ion battery cell as an example, the material of the positive current collector can be aluminum, and the positive electrode active material layer includes a positive electrode active material, 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 includes a negative electrode current collector and a negative electrode active material layer, and the negative electrode active material layer is coated on the surface of the negative electrode current collector; the negative electrode current collector includes a negative electrode coating area and a negative electrode tab connected to the negative electrode coating area, and the negative electrode coating area is coated with a negative electrode active material layer, and the negative electrode tab is not coated with a negative electrode active material layer. The material of the negative electrode current collector can be copper, and the negative electrode active material layer includes a negative electrode active material, and the negative electrode active material can be carbon or silicon, etc. The material of the separator can be PP (polypropylene, polypropylene) or PE (polyethylene, polyethylene), etc.

[0048] At present, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0049] The battery cell is an important component of the power battery. During the production process of the battery cell, the first seal is needed to seal the injection hole on the end cover to prevent leakage of the electrolyte inside the battery cell. The first seal can be a structure such as a rubber nail that acts as a sealing plug. After installing the first seal, the second seal needs to be installed on the end cover. The second seal can be a sealing nail structure made of metal. The second seal is used to fix the first seal and further seal the injection hole.

[0050] In the related art, after the first seal is installed to the injection hole, part of the first seal (for example, one end) protrudes from the upper surface of the end cover. When the subsequent welding and installation of the second seal is performed, the part of the first seal protruding from the upper surface will interfere with the second seal during the positioning and assembly process of the second seal, which not only affects the positioning efficiency and positioning accuracy of the second seal, but even affects the sealing performance of the second seal in severe cases.

[0051] Therefore, how to solve the assembly interference between the portion of the first sealing member protruding from the end cover and the second sealing member is an important issue in the research and development of battery cells and related components.

[0052] In view of this, the present application provides a technical solution, which provides a containing structure on the second seal, and utilizes the containing structure to accommodate the portion of the first seal protruding from the end cover, thereby reducing the interference between the portion of the first seal protruding from the end cover and the second seal, and improving the positioning accuracy and efficiency of the second seal during assembly.

[0053] The following is combined with Figure 1-9 The battery cell, battery and electrical device provided in this embodiment are introduced.

[0054] The battery cells described in the embodiments of the present application are suitable for use in batteries and electrical devices using the batteries.

[0055] The electrical device may be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, and the like. The vehicle may be a fuel vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, and the like; the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, and the like; the electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, and the like; the electric tool may include a metal cutting electric tool, a grinding electric tool, an assembly electric tool, and an electric tool for railways, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator, and an electric planer, and the like. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical devices.

[0056] For the convenience of description, the following embodiments are described by taking the electric device as a vehicle as an example.

[0057] Figure 1 A schematic diagram of the structure of a vehicle provided for some embodiments of the present application.

[0058] Combined with Figure 1 As shown in , the vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000, and the battery 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery 100 may be used to power the vehicle 1000, for example, the battery 100 may be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to power the motor 300, for example, for starting, navigating and driving the vehicle 1000.

[0059] In some embodiments of the present application, the battery 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0060] Figure 2 An exploded view of a battery 100 provided for some embodiments of the present application.

[0061] Combined with Figure 2As shown in , the battery 100 includes a box body 10 and a battery cell 20, and the battery cell 20 is accommodated in the box body 10. Among them, the box body 10 is used to provide a storage space for the battery cell 20, and the box body 10 can adopt a variety of structures. In some embodiments, the box body 10 may include a first part 11 and a second part 12, and the first part 11 and the second part 12 cover each other, and the first part 11 and the second part 12 jointly define a storage space for accommodating the battery cell 20. The second part 12 can be a hollow structure with one end open, and the first part 11 can be a plate-like structure. The first part 11 covers the open side of the second part 12, so that the first part 11 and the second part 12 jointly define a storage space; the first part 11 and the second part 12 can also be hollow structures with one side open, and the open side of the first part 11 covers the open side of the second part 12. Of course, the box body 10 formed by the first part 11 and the second part 12 can be a variety of shapes, such as a cylinder, a cuboid, etc.

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

[0063] Each battery cell 20 may 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 20 may be cylindrical, flat, rectangular, or in other shapes.

[0064] Figure 3 A schematic diagram of the structure of a battery cell before installing a second seal member provided in some embodiments of the present application, Figure 4 A schematic diagram of the structure of a battery cell after the second seal is installed in some embodiments of the present application.

[0065] Combined with Figure 3 As shown in the figure, the battery cell 20 refers to the smallest unit constituting the battery, and the battery cell 20 includes an end cover 21, a shell 22 and an electrode assembly (not shown in the figure) located in the shell.

[0066] The end cap 21 refers to a component that covers the opening of the shell 22 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the end cap 21 can be adapted to the shape of the shell 22 to match the shell 22. Optionally, the end cap 21 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 21 is not easily deformed when squeezed and collided, so that the battery cell 20 can have a higher structural strength and the safety performance can also be improved. Functional components such as electrode terminals 24 can be provided on the end cap 21. The electrode terminal 24 can be electrically connected to the electrode assembly through a converter to output or input electrical energy of the battery cell 20. In some embodiments, the end cap 21 can also be provided with a pressure relief mechanism 23 for releasing the internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold.

[0067] The pressure relief mechanism 23 refers to an element or component that is actuated to release the internal pressure or temperature when the internal pressure or temperature of the battery cell reaches a predetermined threshold. The threshold design varies according to different design requirements. The threshold may depend on one or more materials of the positive electrode plate, negative electrode plate, electrolyte and isolation membrane in the battery cell. The pressure relief mechanism 23 can take the form of an explosion-proof valve, an air valve, a pressure relief valve or a safety valve, and can specifically adopt a pressure-sensitive or temperature-sensitive element or structure, that is, when the internal pressure or temperature of the battery cell reaches a predetermined threshold, the pressure relief mechanism 23 performs an action or a weak structure provided in the pressure relief mechanism 23 is destroyed, thereby forming an opening or channel for the internal pressure or temperature to be released.

[0068] The shell 22 is a component used to cooperate with the end cap 21 to form the internal environment of the battery cell 20, wherein the formed internal environment can be used to accommodate the electrode assembly, electrolyte and other components. The shell 22 and the end cap 21 can be independent components, and an opening (not shown in the figure) can be set on the shell 22, and the end cap 21 covers the opening to form the internal environment of the battery cell 20. Without limitation, the end cap 21 and the shell 22 can also be integrated. Specifically, the end cap 21 and the shell 22 can form a common connection surface before other components are put into the shell, and when the interior of the shell 22 needs to be encapsulated, the end cap 21 covers the shell 22. The shell 22 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 22 can be determined according to the specific shape and size of the electrode assembly. The shell 22 can be made of various materials, 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. In some examples,

[0069] The electrode assembly is a component in the battery 100 where electrochemical reactions occur. One or more electrode assemblies may be included in the housing 22. The electrode assembly is mainly formed by winding or stacking a positive electrode sheet and a negative electrode sheet, and a separator is usually provided between the positive electrode sheet and the negative electrode sheet. The parts of the positive electrode sheet and the negative electrode sheet with active materials constitute the main body of the electrode assembly, and the parts of the positive electrode sheet and the negative electrode sheet without active materials each constitute a tab. The positive electrode tab and the negative electrode tab may be located together at one end of the main body or respectively at both ends of the main body. During the charge and discharge process of the battery, the positive electrode active material and the negative electrode active material react with the electrolyte, and the tabs connect the electrode terminals to form a current loop.

[0070] Figure 5 A schematic structural diagram of an end cover, a first seal and a second seal of a battery cell provided in some embodiments of the present application.

[0071] Combined with Figure 3 , Attachment Figure 4 and attached Figure 5 As shown in , the battery cell 20 provided in this embodiment includes an end cover 21, a first seal 25 and a second seal 26; the end cover 21 has a first surface 211 and a second surface 212 opposite to each other, and an injection hole 213 penetrating the end cover 21 along a first direction X, and the first direction X is parallel to the arrangement direction from the first surface 211 to the second surface 212; the first seal 25 is connected to the injection hole 213, and a portion thereof protrudes from the first surface 211; the second seal 26 is connected to the first surface 211, and the second seal 26 is provided with a accommodating structure 261 arranged opposite to the injection hole 213 along the first direction X, and the accommodating structure 261 is used to accommodate the portion of the first seal 25 protruding from the first surface 211.

[0072] The first surface 211 of the end cap 21 is the surface facing away from the electrode assembly, and the second surface 212 of the end cap 21 is the surface facing the electrode assembly. The injection hole 213 penetrates the end cap 21 along the first direction X and is used to inject electrolyte into the battery cell 20 .

[0073] The first sealing member 25 is used to seal the injection hole 213 to reduce the possibility of electrolyte overflowing from the injection hole 213. The first sealing member 25 can be a rubber nail, and its shape and structure can be a structure similar to a cylindrical or screw shape, and its material can be rubber, silicone, plastic, etc.

[0074] The material of the second seal 26 can be metal material, and the second seal 26 is a sheet structure. The containing structure 261 can be a structure such as a hole or a groove arranged on the second seal 26. When the containing structure 261 is a hole structure (this embodiment is not shown in the figure), the containing structure 261 needs to be sealed and connected with the first seal 25 after accommodating the part of the first seal 25 protruding from the first surface 211.

[0075] The battery cell 20 of the embodiment of the present application is provided with a containing structure 261 on the second seal 26. When a portion of the first seal 25 protrudes from the first surface 211, the containing structure 261 can accommodate the portion protruding from the first surface 211, thereby reducing the influence of the portion of the first seal 25 protruding from the first surface 211 on the installation of the second seal 26, and improving the positioning and assembly efficiency of the second seal 26 installed on the end cover 21.

[0076] In some examples, optionally, along the first direction X, the second seal 26 has a third surface 262 and a fourth surface 263 opposite to each other, the third surface 262 is connected to the first surface 211 , and the receiving structure 261 includes a first groove 2611 disposed on the third surface 262 .

[0077] The first groove 2611 is used to accommodate the upper end of the first sealing member 25 protruding from the first surface 211. The first groove 2611 has the characteristics of simple structure, easy processing, and good sealing performance.

[0078] Figure 6 A schematic diagram of the structure of a second sealing member of a battery cell provided in some embodiments of the present application, Figure 7 A cross-sectional view of a second seal of a battery cell provided in some embodiments of the present application.

[0079] Combined with Figure 6 and attached Figure 7 As shown in , in some examples, optionally, the first groove 2611 is recessed from the third surface 262 in a direction away from the first surface 211 , and a first protrusion 2612 disposed opposite to the first groove 2611 is formed on the fourth surface 263 .

[0080] The first protrusion 2612 and the first groove 2611 can be understood as processing the second seal 26 using stamping or other techniques during processing, so that the third surface 262 of the second seal 26 is recessed and the fourth surface 263 is protruding, forming a groove-type containing structure 261. By designing the first groove 2611 to form the first protrusion 2612 on the fourth surface 263, the recess depth of the first groove 2611 can be increased, so that its containing space is correspondingly increased, and the portion of the first seal 25 protruding from the first surface 211 can be better accommodated.

[0081] In some examples, optionally, the inner wall surface of the first groove 2611 is a curved surface and / or the outer surface of the first protrusion 2612 is a curved surface.

[0082] By designing the first groove 2611 as an arc surface structure, when the second mounting part is assembled, the arc surface has a certain guiding effect on the portion of the first seal 25 protruding from the first surface 211, which can reduce the friction and damage between the portion of the first seal 25 protruding from the first surface 211 and the inner wall surface of the first groove 2611; similarly, the first protrusion 2612 of the arc surface is also conducive to the installation of structures such as an insulating sheet on the second seal 26.

[0083] In some examples, optionally, along a second direction Y intersecting the first direction X, a maximum dimension of the first groove 2611 is greater than or equal to a maximum dimension of the injection hole 213 .

[0084] The second direction Y can be understood as any radial direction of the injection hole 213. The maximum dimension of the first groove 2611 in the first direction is a, and a can be understood as the maximum groove width of the first groove 2611. The maximum dimension of the injection hole 213 in the second direction Y is its radial dimension b. When the dimension of the first groove 2611 in the second direction Y is greater than or equal to the dimension of the injection hole 213 along the second direction Y (that is, a≥b), it can be simultaneously satisfied that the dimension of the first groove 2611 in the second direction Y is greater than or equal to the dimension of the first seal 25. The reason is that the radial dimension of the first seal 25 is basically the same as the radial dimension of the injection hole 213, so that the portion of the first seal 25 protruding from the first surface 211 can enter the first groove 2611.

[0085] In some examples, optionally, along the second direction Y, the maximum dimension of the first groove 2611 is greater than the maximum dimension of the injection hole 213, and the difference between the maximum dimension of the first groove 2611 and the maximum dimension of the injection hole 213 is in the range of 0.1-1 mm.

[0086] That is, a>b, and ab=(0.1-1)mm, preferably ab=0.5mm. This design facilitates the first sealing member 25 in the injection hole 213 to enter the first groove 2611, while reducing the size and space occupied by the first groove 2611, and also improving the tightness of the connection between the first groove 2611 and the protruding portion of the first sealing member 25.

[0087] In some examples, optionally, the first groove 2611 of the present embodiment has a depth dimension of 1-3 mm along the first direction X, which can accommodate the upper end of the first sealing member 25 .

[0088] Combined with Figure 7 , Attachment Figure 8 and attached Fig. 9 As shown in , in some examples, optionally, the first surface 211 is provided with a first positioning structure 2111 , the second seal 26 is provided with a second positioning structure 264 , and the first positioning structure 2111 is positioned and matched with the second positioning structure 264 .

[0089] By providing the first positioning structure 2111 and the second positioning structure 264 for positioning and matching, the positioning and matching accuracy of the second sealing member 26 and the end cover 21 can be further improved, and the assembly efficiency and stability of the second sealing member 26 after installation can be further improved.

[0090] In some examples, optionally, the first positioning structure 2111 includes a second groove 21111 , and the second positioning structure 264 includes a second protrusion 2641 .

[0091] Of course, the first positioning structure 2111 may include a protrusion, and the second positioning structure 264 may include a groove (this embodiment is not shown in the figure).

[0092] The second protrusion 2641 of the second seal 26 can be directly placed in the second groove 21111 on the first surface 211. The second protrusion 2641 and the second groove 21111 cooperate to improve the assembly efficiency and stability of the second seal 26 after installation. The structure is simple and easy to process and assemble.

[0093] In some examples, optionally, the second groove 21111 is an annular groove, and the second protrusion 2641 is an annular protrusion; and / or, the second groove 21111 and the second protrusion 2641 are connected by welding.

[0094] The cooperation between the annular groove and the annular protrusion can achieve accurate positioning cooperation. The receiving structure 261 of this embodiment is surrounded by the annular second protrusion 2641.

[0095] In some examples, optionally, along the first direction X, a maximum groove depth c of the second groove 21111 is greater than or equal to a maximum protrusion height d of the second protrusion 2641 .

[0096] In this embodiment, the second groove 21111 and the second protrusion 2641 can both be arc surface structures to facilitate the connection between the two.

[0097] By designing the groove depth c of the second groove 21111 to be greater than or equal to the protrusion height d of the second protrusion 2641 , it is possible to facilitate the second protrusion 2641 to enter the second groove 21111 , further improving the assembly efficiency of the two, thereby improving the installation efficiency of the second seal 26 .

[0098] In some examples, optionally, along the first direction X, the maximum groove depth c of the second groove 21111 is greater than the maximum protrusion height d of the second protrusion 2641, and the difference between the maximum groove depth c of the second groove 21111 and the maximum protrusion height d of the second protrusion 2641 is 0.01-0.5 mm.

[0099] The difference between c and d is designed to be 0.01-0.5mm, and can further be 0.1-0.3mm, for example 0.2mm. This facilitates the assembly and connection of the two without causing too large a difference in size between the second groove 21111 and the second protrusion 2641. This can improve the tightness of the connection between the two, so that a certain friction force can be generated after the connection between the two, thereby improving the connection stability of the second groove 21111 and the second protrusion 2641.

[0100] In some examples, optionally, along a second direction Y intersecting the first direction X, a maximum groove width e of the second groove 21111 is greater than or equal to a maximum width f of the second protrusion 2641 .

[0101] By designing the maximum groove width e of the second groove 21111 in the second direction Y to be greater than or equal to the maximum width f of the second protrusion 2641 in the second direction Y, the second protrusion 2641 can be easily inserted into the second groove 21111, thereby improving the assembly efficiency of the two and further improving the installation efficiency of the second seal 26.

[0102] In some examples, optionally, along the second direction Y, the maximum groove width e of the second groove 21111 is greater than the maximum width f of the second protrusion 2641, and the difference between the maximum groove width e of the second groove 21111 and the maximum width f of the second protrusion 2641 is 0.05-0.5 mm.

[0103] Furthermore, the difference between e and f may be 0.05-0.3 mm, such as 0.1 mm, which can facilitate the assembly and connection of the two while improving the tightness of the connection between the two.

[0104] Finally, please refer to the attached Figure 3-9As shown in , the embodiment of the present application provides a battery cell 20, including an end cap 21, a first seal 25 and a second seal 26; the end cap 21 has a first surface 211 and a second surface 212 opposite to each other, and a liquid injection hole 213 penetrating the end cap 21 along a first direction X, and the first direction X is parallel to the arrangement direction from the first surface 211 to the second surface 212; the first seal 25 is sealed and connected to the liquid injection hole 213, and part of it protrudes from the first surface 211; the second seal 26 is connected to the first surface 211, and the second seal 26 is provided with a receiving structure 261, and the receiving structure 261 is used to receive the part of the first seal 25 protruding from the first surface 211. Along the first direction X, the second seal 26 has a third surface 262 and a fourth surface 263 opposite to each other, the third surface 262 is connected to the first surface 211, and the receiving structure 261 includes a first groove 2611 arranged on the third surface 262. The first groove 2611 is recessed from the third surface 262 in a direction away from the first surface 211, and a first protrusion 2612 is formed on the fourth surface 263 and is arranged opposite to the first groove 2611. The inner wall surface of the first groove 2611 is an arc surface and / or the outer surface of the first protrusion 2612 is an arc surface. Along the second direction Y intersecting with the first direction X, the maximum size of the first groove 2611 is greater than or equal to the maximum size of the injection hole 213. Along the second direction Y, the maximum size of the first groove 2611 is greater than the maximum size of the injection hole 213, and the difference between the maximum size a of the first groove 2611 and the maximum size b of the injection hole 213 is in the range of 0.1-1mm. The first surface 211 is provided with a first positioning structure 2111, and the second sealing member 26 is provided with a second positioning structure 264, and the first positioning structure 2111 and the second positioning structure 264 are positioned and matched. The first positioning structure 2111 includes a second groove 21111, and the second positioning structure 264 includes a second protrusion 2641. The second groove 21111 is an annular groove, and the second protrusion is an annular protrusion. Along the first direction X, the maximum groove depth c of the second groove 21111 is greater than or equal to the maximum protrusion height d of the second protrusion 2641. Along the first direction X, the maximum groove depth c of the second groove 21111 is greater than the maximum protrusion height d of the second protrusion 2641, and the difference between the maximum groove depth c of the second groove 21111 and the maximum protrusion height d of the second protrusion 2641 is 0.01-0.5mm. Along the second direction Y intersecting with the first direction X, the maximum groove width e of the second groove 21111 is greater than or equal to the maximum width f of the second protrusion 2641. Along the second direction Y, the maximum groove width e of the second groove 21111 is greater than the maximum width f of the second protrusion 2641, and the difference between the maximum groove width e of the second groove 21111 and the maximum width f of the second protrusion 2641 is 0.05-0.5mm.

[0105] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. 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 recorded in the aforementioned embodiments, or make equivalent replacements for the intermediate technical features, but these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery cell, characterized in that: include: An end cap, the end cap having a first surface and a second surface opposite to each other, and a liquid injection hole penetrating the end cap along a first direction, wherein the first direction is parallel to an arrangement direction from the first surface to the second surface; A first sealing member, the first sealing member is sealingly connected to the liquid injection hole and partially protrudes from the first surface; as well as A second sealing member is sealingly connected to the first surface, and the second sealing member is provided with a containing structure, and the containing structure is used to contain a portion of the first sealing member protruding from the first surface.

2. The battery cell according to claim 1, characterized in that: Along the first direction, the second sealing member has a third surface and a fourth surface opposite to each other, the third surface is sealingly connected to the first surface, and the containing structure includes a first groove arranged on the third surface.

3. The battery cell according to claim 2, characterized in that: The first groove is recessed from the third surface toward a direction away from the first surface, and a first protrusion is formed on the fourth surface and is arranged opposite to the first groove.

4. The battery cell according to claim 3, characterized in that: The inner wall surface of the first groove is an arc surface and / or the outer surface of the first protrusion is an arc surface.

5. The battery cell according to claim 2, characterized in that: Along a second direction intersecting the first direction, a maximum dimension of the first groove is greater than or equal to a maximum dimension of the liquid injection hole.

6. The battery cell according to claim 5, characterized in that: Along the second direction, the maximum dimension of the first groove is greater than the maximum dimension of the injection hole, and the difference between the maximum dimension of the first groove and the maximum dimension of the injection hole is in the range of 0.1-1 mm.

7. The battery cell according to any one of claims 1 to 6, characterized in that: The first surface is provided with a first positioning structure, the second sealing component is provided with a second positioning structure, and the first positioning structure and the second positioning structure are positioned and matched.

8. The battery cell according to claim 7, characterized in that: The first positioning structure includes a second groove, and the second positioning structure includes a second protrusion matched with the second groove.

9. The battery cell according to claim 8, characterized in that: The second groove is an annular groove, and the second protrusion is an annular protrusion; and / or, the second groove and the second protrusion are connected by welding.

10. The battery cell according to claim 9, characterized in that: Along the first direction, the maximum groove depth of the second groove is greater than or equal to the maximum protrusion height of the second protrusion.

11. The battery cell according to claim 10, characterized in that: Along the first direction, the maximum groove depth of the second groove is greater than the maximum protrusion height of the second protrusion, and the difference between the maximum groove depth of the second groove and the maximum protrusion height of the second protrusion is 0.01-0.5 mm.

12. The battery cell according to claim 11, characterized in that: Along a second direction intersecting the first direction, a maximum groove width of the second groove is greater than or equal to a maximum width of the second protrusion.

13. The battery cell according to claim 12, characterized in that: Along the second direction, the maximum groove width of the second groove is greater than the maximum width of the second protrusion, and the difference between the maximum groove width of the second groove and the maximum width of the second protrusion is 0.05-0.5 mm.

14. A battery, characterized in that: Comprising a battery cell as claimed in any one of claims 1 to 13.

15. An electrical device, characterized in that: Comprising a battery as claimed in claim 14, the battery is used to provide electrical energy.

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