Battery cell, battery device, and electric device

Abstract

This application discloses a battery cell, a battery device, and an electrical appliance. The battery cell includes a housing with an opening; an electrode assembly disposed in the housing; and an end cap assembly covering the opening. The end cap assembly includes an insulating member disposed at the opening of the housing. The insulating member includes a flat plate portion and a protrusion portion protruding along the flat plate portion toward the electrode assembly. The protrusion portion has a first surface facing the electrode assembly, and a recessed structure extending in a first direction is provided on the first surface. By providing a recessed structure on the insulating member along the length direction of the electrode assembly, when the electrode assembly is assembled from a flat state to an upright state, it is possible to prevent the electrode assembly from being squeezed at the edge of the insulating member, thereby reducing interference between the electrode assembly and the insulating member during production, improving production yield, and enhancing the safety of the battery cell.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery cell, battery device, and electrical equipment. Background Technology

[0002] Electricity is a highly environmentally friendly energy source, with applications in energy storage, transportation, consumer goods, scientific research, and many other fields. Especially in the automotive industry, with the rise of new energy vehicles, batteries are being used extensively. Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of this sustainable development. For electric vehicles, battery technology is a crucial factor in their development.

[0003] In the development of battery technology, besides improving energy density, battery reliability is also a crucial issue. Therefore, how to improve battery reliability is a technical problem that needs to be solved in battery technology. Utility Model Content

[0004] In view of the above problems, this application provides a battery cell, a battery device and an electrical device, wherein a recessed structure is provided on the protrusion of the insulating part of the battery cell to solve the technical problem that the interference between the protrusion of the insulating part of the battery cell and the electrode assembly leads to low yield and low safety performance of the battery cell.

[0005] To solve the above-mentioned technical problems, one technical solution adopted in this application is to provide a battery cell, which includes: a housing including an accommodating space with an opening; an electrode assembly disposed in the accommodating space; and an end cap assembly covering the opening. The end cap assembly includes an insulating member disposed at the opening of the housing. The insulating member includes a flat plate portion and a protrusion portion protruding along the flat plate portion toward the electrode assembly. The protrusion portion has a first surface facing the electrode assembly. A recessed structure extending along a first direction is provided on the first surface, and the recessed structure is located at the end of the protrusion portion along a second direction, thereby forming a clearance space disposed along the first direction. The first direction is the length direction of the end cap assembly, and the second direction is the width direction of the end cap assembly.

[0006] By providing a recessed structure along the length of the end cap assembly on the insulating component, a clearance space is formed in the insulating component along the length of the electrode assembly. This prevents the electrode assembly from being squeezed at the edge of the insulating component when the electrode assembly is assembled from a flat position to an upright position. This reduces interference between the electrode assembly and the insulating component during production, improves production yield, and enhances the safety of the battery cell.

[0007] In one possible implementation, the recessed structure extends through the protrusion along a first direction.

[0008] This configuration allows for greater clearance, resulting in better clearance and further reducing interference between electrode components and insulation parts during production. This improves production yield and enhances the safety of individual battery cells.

[0009] In one possible implementation, the insulating member has protrusions at the middle and / or at opposite ends along the first direction.

[0010] This configuration allows for the placement of other structures, such as pressure relief valves, in the middle of the insulation component, or increases the heat fusion space of the insulation component, facilitating heat fusion at the edges of the insulation component.

[0011] In one possible implementation, the insulating member has protrusions at its middle portion and at opposite ends along the first direction, and a recessed structure is provided on the protrusions at the middle portion of the insulating member, or on at least one of the protrusions at opposite ends along the first direction.

[0012] This setting method allows for the creation of recessed structures only on certain protrusions, enabling more flexible configuration by placing the recessed structures on different protrusions as needed.

[0013] In one possible implementation, a recessed structure is formed on the first surface in the second direction, the recessed structure being located at the end of the protrusion along the first direction.

[0014] This design can prevent damage to the electrode assembly when it rises, thus increasing the safety performance of the individual battery cells. 。

[0015] In one possible implementation, the recessed structure is a stepped structure.

[0016] The stepped structure is very simple and easy to process, and does not take too much time to produce.

[0017] In one possible implementation, the recessed structure is a tapering structure.

[0018] The tapered structure is also very simple, and the transition is smoother, making it less likely to damage the electrode components.

[0019] In one possible implementation, the tapering structure is a chamfered structure.

[0020] The chamfered structure features a smooth transition, and different chamfer angles can be set according to different situations, allowing for greater flexibility.

[0021] In one possible implementation, the tapering structure is a rounded corner structure.

[0022] The rounded corner structure provides a smoother transition without sharp edges, thus better protecting the electrode components from damage.

[0023] In one possible implementation, along a third direction, the size of the recessed structure is not less than 0.05 mm and not greater than the size of the protrusion in that direction, where the third direction is the thickness direction of the end cap assembly.

[0024] This configuration ensures that the recessed structure creates a sufficiently large clearance space, minimizing interference between the insulating components and the electrode assembly.

[0025] In one possible implementation, the flat plate portion has a dimension of not less than 1 mm along a third direction, which is the thickness direction of the end cap assembly.

[0026] This configuration ensures that the insulating components have sufficient space to be heat-fused with other components.

[0027] In one possible implementation, along a third direction, the shortest distance between the recessed structure and the plane where the flat plate is located is not less than 1 mm, and the third direction is the thickness direction of the end cap assembly.

[0028] This configuration increases the area where the insulating parts can be heat-fused with other components, ensuring that no defective products are generated due to insufficient heat-fusion area during the heat-fusion process.

[0029] In one possible implementation, the protrusion forms a groove on the side opposite to the electrode assembly, and a reinforcing rib is provided in the groove.

[0030] The grooves reduce the weight of the insulation components, thereby reducing the weight of the battery cells, while the reinforcing ribs enhance the stability of the protrusions.

[0031] To solve the above-mentioned technical problems, another technical solution adopted in this application is to provide a battery device, which includes any of the above-mentioned battery cells.

[0032] By providing a recessed structure along the length of the electrode assembly on the insulating component, a clearance space is formed in the insulating component along the length of the electrode assembly. This prevents the electrode assembly from being squeezed at the edge of the insulating component when the electrode assembly is changed from a flat to an upright state during assembly. This reduces interference between the electrode assembly and the insulating component during production, improves production yield, and enhances the safety of the battery device.

[0033] To solve the above-mentioned technical problems, another technical solution adopted in this application is to provide an electrical device that includes the aforementioned battery device.

[0034] By providing a recessed structure along the length of the electrode assembly on the insulating component, a clearance space is formed in the insulating component along the length of the electrode assembly. This prevents the electrode assembly from being squeezed at the edge of the insulating component when the electrode assembly changes from a flat to an upright state during assembly. This reduces interference between the electrode assembly and the insulating component during production, improves production yield, and enhances the safety of electrical equipment.

[0035] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above contents and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 This is a structural schematic diagram of a vehicle according to one or more embodiments of this application;

[0038] Figure 2 This is a schematic diagram of the structure of a battery device according to one or more embodiments of this application;

[0039] Figure 3 This is a schematic diagram of the structure of a battery cell according to one or more embodiments of this application;

[0040] Figure 4 This is a bottom view of an insulating member according to one or more embodiments of this application;

[0041] Figure 5 for Figure 4 A front view schematic diagram of the insulating component;

[0042] Figure 6 for Figure 4 A side view of the insulating component;

[0043] Figure 7 This is a schematic diagram of the structure of an electrode assembly before core assembly according to one or more embodiments of this application;

[0044] Figure 8 for Figure 7 A schematic diagram of the electrode assembly during core assembly;

[0045] Figure 9 for Figure 7 A schematic diagram of the electrode assembly after core assembly;

[0046] Figure 10 This is a bottom view of an insulating member according to one or more embodiments of this application;

[0047] Figure 11 This is a side view structural schematic diagram of an insulating member according to one or more embodiments of this application;

[0048] Figure 12 This is a side view structural schematic diagram of an insulating member according to one or more embodiments of this application.

[0049] Wherein, 1000-vehicle; 100-battery; 200-controller; 300-motor; 10-box; 11-first part; 12-second part; 20-cell battery; 21-casing; 22-connector; 23-electrode assembly; 23a-tab; 24-insulator; 211-end cap assembly; 211a-electrode terminal; 212-outer shell; 241-flat plate; 242-protrusion; 421-first surface; 243-recessed structure. Detailed Implementation

[0050] The embodiments of the technical solution of this application will be described in detail below. The following embodiments are only used to illustrate the technical solution of this application more clearly, and are therefore only examples, and should not be used to limit the scope of protection of this application.

[0051] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0052] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, unless otherwise explicitly specified, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0053] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0054] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0055] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0056] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0057] The battery cells disclosed in this application can be used, but are not limited to, in electrical equipment such as vehicles, ships, or aircraft. A power system for such electrical equipment can be constructed using battery cells and batteries disclosed in this application.

[0058] This application provides an electrical device that uses a battery as a power source. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0059] The battery assembly includes a battery cell, which comprises a casing, an insulating component, and an electrode assembly disposed within the casing. The electrode assembly is positioned against or close to a protrusion on the insulating component. Some high-energy-density battery cells include at least two electrode assemblies. During the assembly process in production, the two electrode assemblies are joined from a flat position to an upright position. Due to the height of the anode and cathode plates in the electrode assembly, they interfere with the protrusions on both sides and / or in the middle of the insulating component. This causes the protrusions of the insulating component to squeeze the electrode assembly. Burrs generated when the electrode assembly is cut at the edge are pressed against the opposite electrode, which can easily puncture the separator, leading to overlap of the anode and cathode plates. This short circuit within the electrode assembly can cause self-discharge problems, and in severe cases, battery cell failure, fire, and explosion. Therefore, the interference between the protrusions of the insulating component and the electrode assembly results in low yield and low safety performance of the battery cell.

[0060] Based on the above considerations, in order to solve the technical problem that the electrode assembly in a battery cell may interfere with the protrusion of the insulating component, resulting in low yield and low safety performance of the battery cell, this application proposes a battery cell, a battery device, and an electrical device. The battery cell includes: a housing, including an accommodating space with an opening; an electrode assembly disposed in the accommodating space; and an end cap assembly covering the opening. The end cap assembly includes an insulating component disposed at the opening of the housing. The insulating component includes a flat plate portion and a protrusion portion protruding from the flat plate portion toward the electrode assembly. The protrusion portion has a first surface facing the electrode assembly. A recessed structure extending along a first direction is provided on the first surface, and the recessed structure is located at the end of the protrusion portion along a second direction, thereby forming a clearance space disposed along the first direction. The first direction is the length direction of the end cap assembly, and the second direction is the width direction of the end cap assembly. Therefore, by forming a clearance space along the first direction, the electrode assembly in the battery cell can have a certain amount of room to move when the core is assembled, making it less likely for the protrusion of the insulating part to squeeze the electrode assembly, thereby reducing the possibility of interference between the protrusion of the insulating part and the electrode assembly, and enhancing the efficiency and safety performance of the battery cell.

[0061] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device according to an embodiment of this application.

[0062] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle according to one or more embodiments of this application.

[0063] Vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100 is installed inside vehicle 1000, which can be located at the bottom, front, or rear of vehicle 1000. The battery device 100 can be used to power vehicle 1000; for example, it can serve as the operating power source for vehicle 1000. Vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 controls the battery device 100 to supply power to the motor 300, for example, to meet the power needs of vehicle 1000 during starting, navigation, and driving.

[0064] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0065] Please refer to Figure 2 and Figure 3 , Figure 2 This is a schematic diagram of a battery device according to one or more embodiments of this application. The battery device 100 includes a housing 10 and a battery cell 20, with the battery cell 20 housed within the housing 10. The housing 10 provides a space for accommodating the battery cell 20, and the housing 10 can adopt various structures. In some embodiments, the housing 10 may include a first portion 11 and a second portion 12, which overlap each other, jointly defining a space for accommodating the battery cell 20. The second portion 12 may be a hollow structure with one open end, and the first portion 11 may be a plate-like structure, covering the open side of the second portion 12 so that the first portion 11 and the second portion 12 jointly define the space; alternatively, the first portion 11 and the second portion 12 may both be hollow structures with one open side, with the open side of the first portion 11 covering the open side of the second portion 12. Of course, the housing 10 formed by the first portion 11 and the second portion 12 can be of various shapes, such as a cylinder, a cuboid, etc.

[0066] In the battery device 100, there can be multiple battery cells 20, which can be connected in series, parallel, or in a mixed manner. A mixed connection means that multiple battery cells 20 are connected in both series and parallel configurations. Multiple battery cells 20 can be directly connected in series, parallel, or in a mixed manner, and then the entire assembly of the multiple battery cells 20 is housed within the housing 10. Alternatively, the battery device 100 can also consist of multiple battery cells 20 first connected in series, parallel, or in a mixed manner to form battery modules, and then these modules are connected in series, parallel, or in a mixed manner to form a whole, which is then housed within the housing 10. The battery 100 may also include other structures; for example, it may include a busbar component for electrical connection between the multiple battery cells 20. Each battery cell 20 can be a secondary battery 100 or a primary battery 100; it can also be a lithium-sulfur battery 100, a sodium-ion battery 100, or a magnesium-ion battery 100, but is not limited to these.

[0067] Please refer to Figure 3 , Figure 3 This is a schematic diagram of the structure of a battery cell according to one or more embodiments of this application. Battery cell 20 refers to the smallest unit comprising battery 100. Figure 3As shown, the battery cell 20 includes a housing 21, an electrode assembly 23, and other functional components. The housing 21 includes an end cap assembly 211 and an outer shell 212. The outer shell 212 has an opening, and the end cap assembly 211 closes the opening. The end cap assembly 211 is a component that covers the opening of the outer shell 212 to isolate the internal environment of the battery cell 20 from the external environment. The shape of the end cap assembly 211 can be adapted to the shape of the outer shell 212 to fit it. Optionally, the end cap assembly 211 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap assembly 211 is less prone to deformation under pressure and impact, giving the battery cell 20 higher structural strength and improved safety performance. Functional components such as electrode terminals 211a can be provided on the end cap assembly 211. The electrode terminals 211a can be used for electrical connection with the electrode assembly 23 to output or input electrical energy to the battery cell 20. In some embodiments, the end cap assembly 211 may also be provided with a pressure relief mechanism for releasing internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold. The end cap assembly 211 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose any special limitations on this. In some embodiments, an insulating member 24 may also be provided inside the end cap assembly 211. The insulating member 24 can be used to isolate the electrical connection components within the housing 212 from the end cap assembly 211 to reduce the risk of short circuits. For example, the insulating member 24 can be plastic, rubber, etc. The housing 212 is a component used to cooperate with the end cap assembly 211 to form the internal environment of the battery cell 20, wherein the formed internal environment can be used to accommodate the electrode assembly 23, electrolyte, and other components. The housing 212 and the end cap assembly 211 can be independent components. An opening may be provided on the housing 212, and the end cap assembly 211 closes the opening to form the internal environment of the battery cell 20.

[0068] Alternatively, the end cap assembly 211 and the outer shell 212 can be integrated. Specifically, the end cap assembly 211 and the outer shell 212 can form a common connecting surface before other components are inserted into the shell. When it is necessary to encapsulate the interior of the outer shell 212, the end cap assembly 211 covers the outer shell 212. The outer shell 212 can be of various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the outer shell 212 can be determined according to the specific shape and size of the electrode assembly 23. The material of the outer shell 212 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose any special limitations on this. The outer shell 212 may be provided with an electrode lead-out portion (not shown in the figure), which is used to electrically connect with the tab 23a for outputting or inputting electrical energy of the battery cell 20.

[0069] Electrode assembly 23 is the component in the battery cell 20 where the electrochemical reaction occurs. The casing 212 may contain one or more electrode assemblies 23. The electrode assembly 23 is mainly formed by winding or stacking positive and negative electrode sheets, and typically a separator is provided between the positive and negative electrode sheets. The portions of the positive and negative electrode sheets containing active material constitute the main body of the electrode assembly, while the portions of the positive and negative electrode sheets without active material each constitute a tab 23a. The positive and negative tabs 23a may be located together at one end of the main body or at opposite ends of the main body. During the charging and discharging process of the battery 100, the positive and negative active materials react with the electrolyte, and the tabs 23a are connected to the electrode terminals 211a via connectors 22 to form a current loop.

[0070] To improve the safety performance of battery devices, this application provides a battery cell, a battery device, and an electrical appliance. Please refer to the following: Figures 4 to 6 , Figure 4 This is a bottom view of an insulating member according to one or more embodiments of this application; Figure 5 for Figure 4 A front view schematic diagram of the insulating component; Figure 6 for Figure 4 This is a side view of the insulating component. The battery cell 20 includes a housing 21, an electrode assembly 23, and an end cap assembly 211. The housing 21 includes an accommodating space with an opening, in which the electrode assembly 23 is disposed. The end cap assembly 211 covers the opening of the housing and includes an insulating component 24. The insulating component 24 is disposed at the opening of the housing 21 and includes a flat plate portion 241 and a protrusion 242 protruding along the flat plate portion 241 toward the electrode assembly 23. The protrusion 242 has a first surface facing the electrode assembly 23, and a recessed structure 243 extending along a first direction X is provided on the first surface. The recessed structure 243 is located at the end of the protrusion 242 along a second direction Y, thereby forming a clearance space along the first direction X. The first direction X is the length direction of the end cap assembly 211, and the second direction Y is the width direction of the end cap assembly 211.

[0071] The housing 21 is a crucial component of the battery cell 20, housing the electrode assembly 23 that generates the electrochemical reaction. The housing 21 forms a accommodating space for the electrode assembly 23, with an opening on one side through which the electrode assembly 23 is positioned. An end cap assembly 211 mates with the housing 21 to form the accommodating space for the electrode assembly 23. The electrode assembly 23 may include two electrode assemblies 23. These two electrode assemblies 23 are arranged side-by-side, their length direction being the same as the length direction of the end cap assembly 211 and the insulating member 24, i.e., the first direction X. The width direction of the battery cell 20 is the width direction of the electrode assembly 23, the end cap assembly 211, and the insulating member 24, i.e., the second direction Y. The height direction of the battery cell 20 is the height direction of the electrode assembly 23, and also the thickness direction of the end cap assembly 211 and the insulating member 24, i.e., the third direction. The insulating member 24 is an insulating component in the battery cell 20 used to support the electrode assembly 23. The recessed structure 243 is a structure formed by contraction on the protrusion 242, meaning that the area of ​​the projection of the surface of the protrusion 242 away from the flat plate 241 onto the flat plate 241 is smaller than the area of ​​the entire protrusion 242 projected onto the flat plate 241. The recessed structure 243 is provided at the end of the protrusion 242 along the second direction Y, preferably at the ends on opposite sides along the second direction Y. Furthermore, the recessed structure 243 is also provided at the end of the protrusion 242 away from the flat plate 241 along the third direction Y; therefore, the recessed structure 243 is located at the intersection of the end of the protrusion 242 along the second direction Y and the end of the protrusion 242 away from the flat plate 241 along the third direction. The recessed structure 243 is provided along the first direction X, meaning that the end of the protrusion 242 in the second direction Y intersects with the end of the protrusion 242 away from the flat plate 241 along the third direction, and contractes along the second direction Y. The second direction Y can be perpendicular to the first direction X. The recessed structure 243 is provided at the edge of the protrusion 242. The protrusion 242 may extend in a direction perpendicular to the flat plate 241, or the angle between the side wall connecting the protrusion 242 and the plane of the flat plate 241 where the protrusion 242 is provided and the plane where the protrusion 242 is provided may be 80 to 100 degrees. It should be noted that the projection of the protrusion 242 onto the surface of the flat plate 241 where the protrusion 242 is provided must fall on the flat plate 241. The protrusion 242 and the flat plate 241 may be an integrally formed structure, the insulating member 24 is a whole, and the protrusion 242 and the flat plate 241 are different parts of the insulating member 24.

[0072] Please refer to the following: Figures 7 to 9 , Figure 7 This is a schematic diagram of the structure of an electrode assembly before core assembly according to one or more embodiments of this application; Figure 8 for Figure 7 A schematic diagram of the electrode assembly during core assembly; Figure 9 for Figure 7 This is a schematic diagram of the electrode assembly after core joining. Before core joining, the two electrode assemblies 23 are located on opposite sides of the insulating member 24, lying flat. During core joining, the two electrode assemblies 23 are brought together towards the center. At this time, because the protrusion 242 of the insulating member 24 has a recessed structure 243, it has a certain clearance space, reducing the possibility of the two electrode assemblies 23 being interfered with by the protrusion 242, thereby preventing the electrode assemblies 23 from being squeezed at the edge of the insulating member 24 and puncturing. After core joining, the two electrode assemblies 23 are arranged side by side, standing vertically on the plastic part.

[0073] By providing a recessed structure 243 on the insulating member 24 along the length direction of the electrode assembly 23, a clearance space is formed in the insulating member 24 along the length direction of the electrode assembly 23. This prevents the electrode assembly 23 from being squeezed at the edge of the insulating member 24 when the electrode assembly 23 is changed from a flat state to an upright state during assembly. This reduces interference between the electrode assembly 23 and the insulating member 24 during production, improves production yield, and enhances the safety of the battery cell 20.

[0074] In one possible implementation, the recessed structure 243 extends through the protrusion 242 along a first direction.

[0075] The recessed structure 243 has the same dimension in the first direction X as the protrusion 242 in the first direction X, that is, the part of the protrusion 242 with the recessed structure 243 occupies the end of the protrusion and is not blocked.

[0076] This configuration allows for greater clearance, resulting in better clearance and further reducing interference between electrode components and insulation parts during production. This improves production yield and enhances the safety of individual battery cells.

[0077] In one possible implementation, the insulating member 24 is provided with protrusions 242 at the middle and / or at opposite ends along the first direction X.

[0078] The middle part of the insulating member 24 is located at the midpoint along the first direction X. A pressure relief mechanism may be installed at this location; therefore, a protrusion 242 can be provided here to ensure the structural strength of the area surrounding the pressure relief structure. The opposite ends of the insulating member 24 along the first direction X are generally used for heat fusion with other components; therefore, providing a protrusion 242 increases the area to meet the heat fusion requirements. Depending on the design requirements of the battery cell 20, a protrusion 242 can be provided at the middle of the insulating member 24, or at the opposite ends along the first direction X, or both at the middle and opposite ends along the first direction X. A recessed structure 243 can be provided at any location where a protrusion 242 is provided.

[0079] This arrangement allows for the placement of other structures, such as a pressure relief valve, in the middle portion of the insulating component 24, or increases the heat fusion space of the insulating component 24 to facilitate heat fusion at the edges of the insulating component 24.

[0080] In one possible implementation, the insulating member 24 has protrusions 242 at its middle portion and at opposite ends along the first direction X, and recesses 243 are provided on the protrusions 242 at the middle portion of the insulating member 24, or on at least one of the protrusions 242 at opposite ends along the first direction X.

[0081] In this embodiment, at least three protrusions 242 are provided on the insulating member 24, located at the middle of the insulating member 24 and at opposite ends along the first direction X. However, the recessed structure 243 is only provided on the protrusion in the middle of the insulating member 24, or only on any one or all of the protrusions 242 located at opposite ends along the first direction X. Based on experiments or product analysis, it can be determined which position of the electrode assembly 23 is prone to interference with the protrusion 242, resulting in a puncture phenomenon, and the recessed structure 243 is set on the corresponding position of the protrusion 242 to ensure that the best effect is achieved with minimal modification to the insulating member 24. For example, if only the protrusion 242 in the middle of the insulating member 24 is prone to interference with the electrode assembly 23, then the recessed structure 243 can be provided only on the protrusion 242 in the middle of the insulating member 24.

[0082] This setting method allows for the setting of recessed structures 243 only on some of the protrusions 242, and the recessed structures 243 can be set on different protrusions 242 according to the needs, making the setting more flexible.

[0083] Please refer to the following: Figure 10 , Figure 10This is a bottom view of an insulating member according to one or more embodiments of the present application. In one possible embodiment, a recessed structure 243 is formed on the first surface in the second direction Y, and the recessed structure 243 is located at the end of the protrusion 242 along the first direction X.

[0084] The recessed structure 243 is provided at the end of the protrusion 242 along the first direction X, preferably at the ends on opposite sides along the first direction X. Additionally, the recessed structure 243 is also provided at the end of the protrusion 242 away from the flat plate 241 along the third direction Y. Therefore, the recessed structure 243 is located at the intersection of the end of the protrusion 242 along the first direction X and the end of the protrusion 242 away from the flat plate 241 along the third direction. This structure provides the recessed structure 243 in both the width and length directions of the motor assembly; that is, the side of the protrusion 242 away from the flat plate 241 tapers from the periphery towards the center, thereby forming a recessed structure 243 extending along both the first direction X and the second direction Y. Furthermore, some protrusions 242 may have the recessed structure 243 in both the first direction X and the second direction Y, while some protrusions 242 may only have the recessed structure 243 in the first direction X. Alternatively, all the protrusions 242 may have recessed structures 243 in both the first direction X and the second direction Y. During use or transportation, the electrode assembly 23 may move, and if it shifts upwards, it may interfere with the protrusions 242. This is especially true for the tab 23a, which is prone to interference with the protrusions 242. Therefore, by providing recessed structures 243 along the second direction on the protrusions 242, the protrusions can be prevented from shifting upwards, thus avoiding damage to the electrode assembly 23.

[0085] This configuration can avoid damage to the electrode assembly 23 when it rises, preventing the insulating component 24 from crushing the electrode assembly 23 and increasing the safety performance of the battery cell 20.

[0086] In one possible implementation, the recessed structure 243 is a stepped structure.

[0087] The stepped structure is a stepped structure. In this embodiment, the recessed structure 243 on the protrusion 242 has only one height difference, thus forming a single-level stepped structure. In other embodiments, the recessed structure 243 on the protrusion 242 may have multiple height differences, forming a multi-level stepped structure. The stepped structure causes the protrusion 242 to form two outward-pointing angles and one inward-pointing angle on one side. The outward-pointing angle is a protruding angle, and the inward-pointing angle is a recessed angle. The inward-pointing angle is located between the two outward-pointing angles, thereby creating a clearance space between the two outward-pointing angles to prevent contact with the electrode assembly 23 during the core-joining process. The outward-pointing angle and the inward-pointing angle can be 90 degrees or between 80 and 100 degrees.

[0088] The stepped structure is very simple and easy to process, and does not take too much time to produce.

[0089] In one possible implementation, the recessed structure 243 is a tapering structure.

[0090] The tapering structure gradually shrinks towards the center of the protrusion 242. In this embodiment, the protrusion 242 is gradually tapered away from the flat plate 241. The tapering can occur in a straight line, along a curve, or a combination of a straight line and a curve. This tapering structure allows the surface of the protrusion 242 to gradually transition into a clearance space, making the surface of the protrusion 242 smoother. During the core assembly process, the electrode assembly 23 is less likely to come into contact with the recessed structure 243 of the protrusion 242, and is less likely to come into contact with sharp edges, thus preventing burrs from easily penetrating.

[0091] The tapered structure is also very simple, and the transition is smoother, making it less likely to damage the electrode assembly 23.

[0092] Please refer to the following: Figure 11 , Figure 11 This is a side view of an insulating member according to one or more embodiments of this application. In one possible embodiment, the tapering structure is a chamfered structure. The chamfered structure is a planar structure, and its surface is set at an acute or obtuse angle to the side of the protrusion 242. The chamfered structure is a common structure, usually used to avoid the occurrence of right-angled edges.

[0093] The chamfered structure features a smooth transition, and different chamfer angles can be set according to different situations, allowing for greater flexibility.

[0094] Please refer to the following: Figure 12 , Figure 12 This is a side view of an insulating member according to one or more embodiments of the present application. In one possible embodiment, the tapering structure is a rounded corner structure.

[0095] The rounded corner structure is a rounded transition structure that does not produce sharp corners when connected to other surfaces, resulting in a completely smooth transition.

[0096] The rounded corner structure provides a smoother transition and avoids sharp edges, thus better protecting the electrode assembly 23 from damage.

[0097] In one possible implementation, along the third direction Z, the size of the recessed structure 243 is not less than 0.05 mm and not greater than the size of the protrusion 242 in that direction.

[0098] The thickness direction of the end cap assembly 211 is the third direction Z. In the third direction Z, the dimension of the recessed structure 243 cannot be less than 0.05 mm. For example, in the third direction Z, the dimension of the recessed structure 243 can be any one of 0.05 mm, 0.06 mm, 0.08 mm, 0.1 mm, 0.2 mm, 0.5 mm, 0.8 mm, 1 mm, 2 mm, or 5 mm, or any one of any two of the above values, or any value greater than 5 mm. It is worth noting that in the third direction Z, the dimension of the recessed structure 243 cannot be greater than or equal to the dimension of the protrusion 242.

[0099] This arrangement ensures that the clearance space formed by the recessed structure 243 is large enough to prevent the insulating component 24 from interfering with the electrode assembly 23 as much as possible.

[0100] In one possible implementation, the size of the flat plate portion 241 along the third direction Z is not less than 1 mm.

[0101] The thickness direction of the end cap assembly 211 is the third direction Z, which is the thickness direction of the insulating member 24 and the flat plate portion 241. The dimension of the flat plate portion 241 along the thickness direction of the end cap assembly 211 is the thickness of the flat plate portion 241. If the motor assembly requires as much movement space as possible during core assembly to avoid interference with the protrusion 242, a recessed structure 243 may be provided at the connection between the protrusion 242 and the flat plate portion 241. Since the recessed structure 243 is provided on the protrusion 242, the flat plate portion 241 needs to ensure sufficient heat fusion space, and its thickness cannot be less than 1 mm. The dimension of the flat plate portion 241 along the thickness direction of the end cap assembly 211 can be any value among 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.5 mm, 1.8 mm, 2 mm, 2.5 mm, 3 mm, 4 mm, and 5 mm, or any value within any two of the above ranges, or any value greater than 5 mm.

[0102] This arrangement ensures that the insulating component 24 has enough space to be heat-fused with other components.

[0103] In one possible implementation, along the third direction Z, the shortest distance between the recessed structure 243 and the plane where the flat plate portion 241 is located is not less than 1 mm.

[0104] The recessed structure 243 is a structure provided on the protrusion 242, located on the side of the protrusion 242 away from the flat plate 241 along the third direction Z. The recessed structure 243 can be provided at intervals from the flat plate 241, and the portion connecting the flat plate 241 and the recessed structure 243 is the sidewall of the protrusion 242. During heat melting, the sidewall of the protrusion 242 can also participate in the heat melting.

[0105] This configuration increases the area where the insulating component 24 can be heat-fused with other components, ensuring that no defective products are generated due to insufficient heat-fusion area during heat fusion.

[0106] In one possible implementation, the protrusion 242 forms a groove on the side opposite to the electrode assembly 23, and a reinforcing rib is provided in the groove.

[0107] The protrusion 242 of the insulating member 24 is generally hollow, thus forming a groove inside the protrusion 242. The opening of the groove is located on the surface of the flat plate 241 away from the electrode assembly 23. The groove may affect the structural strength of the insulating member 24 at the protrusion 242, so reinforcing ribs can be provided in the groove to strengthen the structural strength at this location. The reinforcing ribs can be strip structures, mesh structures, plate structures, etc., provided in the groove, and can be provided according to actual needs. The reinforcing ribs and the protrusion 242 can also be integrally formed, with the insulating member 24 as a whole, and the flat plate 241, the protrusion 242, and the reinforcing ribs being different parts of the insulating member 24.

[0108] The grooves reduce the weight of the insulating component 24, thereby reducing the weight of the battery cell 20, and the reinforcing ribs enhance the stability of the protrusion 242.

[0109] This application also provides a battery device, which includes a battery cell 20 of any of the above.

[0110] A battery device may contain one or more battery cells 20. The battery device is the basic unit for supplying power, and the battery cell 20 is the smallest power supply unit in the battery device. The battery device may also include structures such as a casing.

[0111] By providing a recessed structure 243 on the insulating member 24 along the length direction of the electrode assembly 23, a clearance space is formed in the insulating member 24 along the length direction of the electrode assembly 23. This prevents the electrode assembly 23 from being squeezed at the edge of the insulating member 24 when the electrode assembly 23 is changed from a flat state to an upright state during assembly. This reduces interference between the electrode assembly 23 and the insulating member 24 during production, improves production yield, and enhances the safety of the battery device.

[0112] This application also provides an electrical device that includes the battery device described above.

[0113] Electrical devices can include, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Among them, electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0114] By providing a recessed structure 243 on the insulating member 24 along the length direction of the electrode assembly 23, a clearance space is formed in the insulating member 24 along the length direction of the electrode assembly 23. This prevents the electrode assembly 23 from being squeezed at the edge of the insulating member 24 when the electrode assembly 23 changes from a flat state to an upright state during assembly. This reduces interference between the electrode assembly 23 and the insulating member 24 during production, improves production yield, and enhances the safety of electrical equipment.

[0115] Finally, in a specific application scenario, addressing the issue that interference may occur between the protrusion 242 of the insulating member 24 and the electrode assembly 23 in existing battery cells 20, leading to low yield and low safety performance of the battery cell 20, the battery cell 20 of this application includes a housing 21, an electrode assembly 23, and an end cap assembly 211. The housing 21 includes an accommodating space with an opening, in which the electrode assembly 23 is disposed. The end cap assembly 211 covers the opening of the housing and includes an insulating member 24. The insulating member 24 is disposed at the opening of the housing 21 and includes a flat plate portion 241 and a protrusion 242 protruding from the flat plate portion 241 toward the electrode assembly 23. The protrusion 242 has a first surface facing the electrode assembly 23. A recessed structure 243 extending along a first direction X is provided on the first surface, and the recessed structure 243 is located at the end of the protrusion 242 along a second direction Y, thereby forming a clearance space along the first direction X. The first direction X is the length direction of the end cap assembly 211, and the second direction Y is the width direction of the end cap assembly 211. The recessed structure 243 penetrates the protrusion 242 along the first direction. The insulating member 24 has protrusions 242 at its middle portion and at opposite ends along the first direction X, and each protrusion 242 has a recessed structure 243. The recessed structure 243 has a stepped structure.

[0116] By providing a recessed structure 243 on the insulating member 24 along the length of the electrode assembly 23, a clearance space is formed between the insulating member 24 and the electrode assembly 23. This prevents the electrode assembly 23 from being squeezed at the edge of the insulating member 24 when it changes from a flat to an upright position during assembly. This reduces interference between the electrode assembly 23 and the insulating member 24 during production, improves production yield, and enhances the safety of the battery cell 20. Furthermore, this design allows for a larger clearance space, resulting in a better clearance effect and further reducing interference between the electrode assembly and the insulating member during production, improving production yield and enhancing the safety of the battery cell. The stepped structure is simple, easy to process, and does not require excessive time during production.

[0117] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized by, The battery cell includes: The housing includes an accommodating space with an opening; An electrode assembly is disposed in the accommodating space; An end cap assembly covers the opening. The end cap assembly includes an insulating member disposed at the opening of the housing. The insulating member includes a flat plate portion and a protrusion portion protruding along the flat plate portion toward the electrode assembly. The protrusion portion has a first surface facing the electrode assembly. A recessed structure extending in a first direction is provided on the first surface, and the recessed structure is located at the end of the protrusion portion in a second direction. The first direction is the length direction of the end cap assembly, and the second direction is the width direction of the end cap assembly.

2. The battery cell of claim 1, wherein, The recessed structure penetrates the protrusion along the first direction.

3. The battery cell according to claim 1 or 2, characterized in that, The insulating member has the protrusions at its center and / or at opposite ends along the first direction.

4. The battery cell of claim 3, wherein, The insulating member has protrusions at its center and at opposite ends along the first direction. The recessed structure is disposed on the protrusions at the center of the insulating member, or on at least one of the protrusions disposed at opposite ends along the first direction.

5. The battery cell according to claim 1 or 2, characterized in that, The first surface has the recessed structure formed in the second direction, and the recessed structure is located at the end of the protrusion along the first direction.

6. The battery cell according to claim 1 or 2, characterized in that, The recessed structure is a stepped structure.

7. The battery cell according to claim 1 or 2, characterized in that, The recessed structure is a tapering structure.

8. The battery cell of claim 7, wherein, The tapering structure is a chamfered structure.

9. The battery cell of claim 7, wherein, The tapering structure is a rounded corner structure.

10. The battery cell according to claim 1 or 2, characterized in that, Along a third direction, the size of the recessed structure is not less than 0.05 mm and not greater than the size of the protrusion in that direction, where the third direction is the thickness direction of the end cap assembly.

11. The battery cell according to claim 1 or 2, characterized in that, The flat plate portion has a dimension of not less than 1 mm along a third direction, where the third direction is the thickness direction of the end cap assembly.

12. The battery cell according to claim 1 or 2, characterized in that, Along a third direction, the shortest distance between the recessed structure and the plane where the flat plate is located is not less than 1 mm, and the third direction is the thickness direction of the end cap assembly.

13. The battery cell of claim 1 or 2, wherein, The protrusion forms a groove on the side opposite to the electrode assembly, and a reinforcing rib is provided in the groove.

14. A battery device characterized by comprising: The battery device includes a single battery cell as described in any one of claims 1-13.

15. An electrical device, characterized by The electrical equipment includes the battery device as described in claim 14.

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