Battery cell, battery device, and electric device

Abstract

The application is suitable for the technical field of batteries, and provides a battery monomer, a battery device and a power utilization device. The battery monomer comprises: a shell, which has an accommodating cavity with at least one open end; an electrode assembly, which is accommodated in the accommodating cavity; and an end cover, which comprises an end cover main body connected to the shell and covering the opening of the accommodating cavity. A boss is arranged on the side of the end cover main body facing the accommodating cavity, and the boss is arranged in a spaced manner with the electrode assembly. A flange is arranged on the circumferential side of the surface of the end cover facing the accommodating cavity. In the direction perpendicular to the end cover main body, the height of the flange is less than or equal to the height of the boss. In the battery monomer provided by the embodiment, the boss is arranged on the side of the end cover facing the accommodating cavity, so as to improve the strength of the whole end cover through the boss and provide protection for the adapter in the shell. The height of the flange is less than or equal to the height of the boss, so that the flange is difficult to protrude out of the boss, thereby reducing the risk of the flange contacting and damaging the tab and improving the stability of the battery monomer.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to battery cells, battery devices, and power-consuming devices. Background Technology

[0002] Currently, judging from market trends, the application of battery devices is becoming increasingly widespread. Battery devices are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely applied in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of battery device applications, market demand is also constantly increasing.

[0003] In current battery cells, during the process of installing the end cap onto the casing, the end cap is prone to contacting or puncturing the tabs of the electrode assembly, which can easily lead to tab damage. Summary of the Invention

[0004] In view of the above problems, this application provides a battery cell, a battery device, and an electrical device that can alleviate the problem that the end cap can easily damage the electrode tabs.

[0005] In a first aspect, embodiments of this application provide a single battery cell, comprising:

[0006] The housing has a receiving cavity with an opening at least at one end; an electrode assembly is received within the receiving cavity; an end cap includes an end cap body connected to the housing and covering the opening of the receiving cavity, the end cap body has a boss protruding on one side facing the receiving cavity, the boss is spaced apart from the electrode assembly, and a flange protrudes on the circumferential side of the end cap facing the receiving cavity; in a direction perpendicular to the end cap body, the height of the flange is less than or equal to the height of the boss.

[0007] In this embodiment, a boss is provided on the side of the end cap facing the receiving cavity to improve the overall strength of the end cap and provide protection for the adapter inside the housing; the height of the flange is less than or equal to the height of the boss, thereby reducing the risk of the flange contacting and damaging the tabs and improving the stability of the battery cell.

[0008] In some embodiments, the flange includes a first part and a second part connected to the first part, the first part being positioned corresponding to the boss, and the second part being offset from the boss; in a direction perpendicular to the end cap body, the size of the second part is smaller than the size of the first part.

[0009] In the technical solution of this embodiment, the flange includes a first part corresponding to the boss and a second part offset from the boss, and the height of the second part is less than the height of the first part, so that the second part offset from the boss is difficult to contact the tab, thereby further reducing the risk of the flange contacting and damaging the tab.

[0010] In some embodiments, the height of the flange is less than or equal to 2 mm in the direction perpendicular to the end cap body.

[0011] The technical solution of this embodiment provides a range of flange height dimensions to reduce the risk of flange contact with the tab, reduce the risk of tab damage, and improve the stability of the battery cell.

[0012] In some embodiments, the height of the flange in the direction perpendicular to the end cap body ranges from 0.4 mm to 1 mm.

[0013] The technical solution of this embodiment further provides some flange height ranges to reduce the risk of flange contact and damage to the electrode tab, while also enabling the flange to play an auxiliary role in fixing the end cap, so that the end cap can be better connected to the housing.

[0014] In some embodiments, the battery cell further includes a protective member housed within a housing cavity, at least a portion of which is disposed between the end cap and the electrode assembly; the projection of the protective member onto the end cap surrounds the projection of the electrode assembly onto the end cap, and the projection of the protective member onto the end cap is offset from the projection of the electrode assembly onto the end cap.

[0015] In the technical solution of this embodiment, a protective component is provided and surrounds the electrode assembly to reduce the risk of short circuit between the tab and the casing, and at the same time reduce the risk of electrolyte leakage; the projection of the protective component is offset from the projection of the electrode assembly to reduce the risk of the protective component damaging the tab or electrode assembly, and further improve the stability of the battery device.

[0016] In some embodiments, the protective element is attached to the end cap.

[0017] In this embodiment, the protective component is connected to the end cap to facilitate its installation and fixation. At the same time, the gap between the end cap and the protective component can be reduced or eliminated, thereby reducing the risk of short circuit between the tab and the housing through the gap, and also reducing the risk of electrolyte leakage through the gap.

[0018] In some embodiments, the electrode assembly has a first end facing the end cap, and the end of the protective member facing away from the end cap is flush with the first end.

[0019] In the technical solution of this embodiment, the protective component can not only protect the electrode assembly to reduce the risk of short circuit between the electrode tab and the housing, but also reduce the space occupied by the protective component.

[0020] In some embodiments, the electrode assembly has a first end facing the end cap, and the protective member has an end facing away from the end cap that extends beyond the plane of the first end.

[0021] In the technical solution of this embodiment, the end of the protective member away from the end cover extends to the end of the electrode assembly facing the end cover, so that a part of the protective member can overlap with the electrode assembly, thereby enabling the protective member to better protect the electrode tab and reduce the risk of short circuit between the electrode tab and the housing; when the electrode assembly is formed by stacking or winding, this arrangement can also constrain the electrode assembly.

[0022] In some embodiments, the distance between the end of the protective member away from the end cap and the plane containing the first end is in the range of 2mm to 3mm.

[0023] The technical solution of this embodiment provides specific size ranges for the overlap of some protective components and electrode assemblies, so that the protective components can not only protect the electrode tabs and constrain the electrode assemblies, but also reduce the space occupied by the protective components.

[0024] In some embodiments, the protective member is connected to the side of the boss or flange, and the distance between the protective member and the end cap body is less than the height of the boss.

[0025] In the technical solution of this embodiment, the protective component is connected to the side of the boss or flange. Since the space on the side of the end cap body facing the receiving cavity is limited, connecting the protective component to the boss or flange can reduce the space occupied by the protective component on the end cap body and also reduce the processing difficulty.

[0026] In some embodiments, the size of the connection between the protective member and the boss or flange in the direction perpendicular to the end cap body ranges from 0.1 mm to 0.5 mm.

[0027] The technical solution of this embodiment provides a range of dimensions for the connection between the protective component and the boss, which can not only make the protective component stably connected to the boss or flange, but also reduce the space occupied by the protective component near the end cap.

[0028] In some embodiments, the distance between the protective element and the end cap body ranges from 0.2 mm to 0.5 mm.

[0029] The technical solution of this embodiment provides a range of spacing between the protective components and the end cap body, which can reduce the space occupied by the protective components and also protect the electrode tabs, reducing the risk of short circuit between the electrode tabs and the housing. Since the protective components are connected to the boss, this size range also limits the height of the boss, so that the boss can better improve the overall strength of the end cap and provide protection for the adapter.

[0030] In some embodiments, the thickness of the protective element ranges from 40 μm to 70 μm.

[0031] The technical solution of this embodiment provides a range of thicknesses for the protective components, so that the protective components can both protect the electrode tabs and reduce the space occupied by the protective components.

[0032] In some embodiments, the protective element is made of at least plastic, and the protective element is attached to the end cap by a hot-melt process.

[0033] The technical solution of this embodiment provides specific materials for some protective components, so that the protective components can not only protect the tabs and reduce the risk of short circuit between the tabs and the shell, but also reduce the weight of the protective components and improve the service life of the protective components in the electrolyte environment; the protective components are connected to the end cap through a hot-melt process, so that the protective components can be connected to the end cap more stably.

[0034] In some embodiments, the electrode assembly includes a cathode tab disposed adjacent to an end cap.

[0035] In the technical solution of this embodiment, the end cap is adjacent to the cathode lug of the electrode assembly. At this time, the protective component can be connected to the end cap or spaced apart from the end cap so that the protective component can be arranged as needed.

[0036] In some embodiments, the electrode assembly includes an anode tab disposed adjacent to an end cap.

[0037] In this embodiment, the end cap is placed adjacent to the anode lug of the electrode assembly. At this time, the protective component is connected to the end cap to better reduce the risk of short circuit between the anode lug and the housing.

[0038] In some embodiments, the battery cell has a cylindrical structure.

[0039] In this embodiment, the battery cell is made into a cylindrical structure. Because the tabs are more susceptible to damage from the flange in a cylindrical battery cell, the battery cell is made into a cylindrical structure to reduce the risk of damage to the tabs.

[0040] Secondly, embodiments of this application also provide a single battery cell, comprising:

[0041] The housing has a receiving cavity with an opening at least one end; an electrode assembly is received within the receiving cavity; an end cap includes an end cap body connected to the housing and covering the opening of the receiving cavity, the end cap body having a boss protruding from one side facing the receiving cavity; a protective member is connected to the side of the boss, at least a portion of the protective member is disposed between the end cap and the electrode assembly; the projection of the protective member onto the end cap surrounds the projection of the electrode assembly onto the end cap, and the projection of the protective member onto the end cap is offset from the projection of the electrode assembly onto the end cap.

[0042] Thirdly, embodiments of this application also provide a battery device, including a battery cell provided in some embodiments of the first aspect, or a battery cell provided in some embodiments of the second aspect.

[0043] Fourthly, embodiments of this application also provide an electrical device, including a battery cell provided in some embodiments of the first aspect, or a battery cell provided in some embodiments of the second aspect, or a battery device provided in some embodiments of the third aspect.

[0044] 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 and other objects, features and advantages of this application more obvious and understandable, specific embodiments of this application are given below. Attached Figure Description

[0045] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0046] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0047] Figure 2 This is an exploded view of the battery device provided in some embodiments of this application;

[0048] Figure 3 This is an exploded structural diagram of a battery cell provided in some embodiments of this application;

[0049] Figure 4 A schematic diagram showing the exploded structure of a battery cell provided in other embodiments of this application;

[0050] Figure 5 Three-dimensional schematic diagrams of end caps and related structures provided in some embodiments of this application;

[0051] Figure 6 Three-dimensional schematic diagrams of end caps and related structures provided for other embodiments of this application;

[0052] Figure 7 Front view schematic diagrams of end caps and related structures provided in some embodiments of this application;

[0053] Figure 8 A perspective view of end caps, protective components and related structures provided in some embodiments of this application;

[0054] Figure 9Front view schematic diagrams of end caps, protective components and related structures provided for some embodiments of this application;

[0055] Figure 10 A partial cross-sectional schematic diagram of a battery cell provided in some embodiments of this application;

[0056] Figure 11 for Figure 10 Enlarged view of part A in the middle Figure 1 ;

[0057] Figure 12 for Figure 10 Enlarged view of part A in the middle Figure 2 .

[0058] The markings in the diagram mean:

[0059] 1000, vehicles;

[0060] 100. Battery device;

[0061] 10. Box; 11. First box; 12. Second box;

[0062] 20. Battery cell; 21. Housing; 201. Receiving cavity; 22. End cap; 221. End cap body; 222. Boss; 223. Flange; 2231. First part; 2232. Second part; 23. Electrode assembly; 231. Cathode tab; 232. Anode tab; 233. First end; 24. Electrode terminal; 25. Protective component; 26. Adapter;

[0063] 200. Motor;

[0064] 300. Controller. Detailed Implementation

[0065] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0066] 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.

[0067] 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, "multiple" means two or more, unless otherwise explicitly defined.

[0068] 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.

[0069] 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.

[0070] In the description of the embodiments of this application, 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).

[0071] 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.

[0072] 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.

[0073] Currently, judging from market trends, the application of battery devices is becoming increasingly widespread. Battery devices are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely applied in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of battery device applications, market demand is also constantly increasing.

[0074] In current battery cells, the side of the end cap facing the housing cavity is usually provided with a closed annular flange. When the end cap is closed with the housing, the flange can be inserted into the housing cavity and abut against the inner wall of the housing to help fix the end cap, block the seam between the end cap and the housing, and prevent the electrolyte from flowing out of the housing cavity.

[0075] During end cap installation, the flange is prone to colliding with and damaging the tabs. For cylindrical battery cells, the tabs are flattened, near-planar structures with a large and thin area, making them more susceptible to flange damage. Damaged tabs can negatively impact current or voltage input and output, and negatively affect the performance of the battery cell, leading to decreased stability.

[0076] Furthermore, due to the small space inside the casing, installing additional protective structures inside the casing can easily reduce the space ratio of the electrode assembly within the cavity, leading to a decrease in the energy density of the battery cells.

[0077] Based on the above considerations, in order to alleviate the problem that the end cap is prone to damage to the tabs during installation, this application provides a battery cell with a boss on the side of the end cap body facing the receiving cavity, and the height of the boss is less than or equal to the height of the boss.

[0078] In such a battery cell, the overall strength of the end cap is improved by the boss, and the adapter inside the housing is protected; the height of the flange is made less than or equal to the height of the boss, thereby reducing the risk of the flange contacting and damaging the tabs, and improving the stability of the battery cell.

[0079] The battery device disclosed in this application can be used in electrical devices that use the battery device as a power source or in various energy storage systems that use the battery device as an energy storage element. 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. 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., and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0080] For ease of explanation, the following embodiments will be described using a vehicle 1000 as an example of an electrical device according to an embodiment of this application.

[0081] refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of this application. The 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 is installed inside the vehicle 1000, and the battery can be located at the bottom, front, or rear of the vehicle 1000. The battery can be used to power the vehicle 1000; for example, the battery can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 300 and a motor 200. The controller 300 is used to control the battery to supply power to the motor 200, for example, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

[0082] In some embodiments of this application, the battery 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.

[0083] refer to Figure 2 , Figure 2 This is an exploded structural diagram of a battery device 100 provided in some embodiments of this application.

[0084] The battery device 100 mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells 20, which are connected in series, parallel, or mixed connections via busbars.

[0085] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells 20.

[0086] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells 20 together. As an example, a battery module can also be formed by bundling multiple battery cells 20 together with cable ties.

[0087] In some embodiments, the battery device 100 may be a battery pack, which includes a housing 10 and one or more individual battery cells housed within the housing 10.

[0088] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be housed in the housing 10 by fixing the battery module in the housing 10.

[0089] As an example, the battery cell assembly can also be housed in the housing 10 by directly fixing multiple battery cells 20 to the housing 10.

[0090] As an example, the housing 10 may include a first housing 11 and a second housing 12. The first housing 11 and the second housing 12 are fastened together to form a closed space inside the housing 10 to house the battery cell assembly. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first housing 11 may be an end cap 22 or a base plate.

[0091] As an example, the housing 10 may include an end cap 22, a frame, and a base plate. The end cap 22 and the base plate are respectively connected to the frame, so that the interior of the housing 10 forms a closed space to accommodate the battery cell assembly.

[0092] In some embodiments, the housing 10 may be part of the chassis structure of the vehicle 1000. For example, a portion of the housing 10 may be at least a portion of the floor of the vehicle 1000, or a portion of the housing 10 may be at least a portion of the crossbeams and longitudinal beams of the vehicle 1000.

[0093] refer to Figure 3 , Figure 3 This is an exploded structural diagram of a battery cell 20 provided in some embodiments of this application. A battery cell 20 refers to the smallest unit that makes up a battery. The battery cell 20 can be a rechargeable battery, meaning that after the battery cell 20 has been discharged, its active materials can be activated by charging and it can continue to be used.

[0094] The battery cell 20 can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0095] As shown in the figure, the battery cell 20 includes an end cap 22, a housing 21, an electrode assembly 23, and other functional components.

[0096] End cap 22 refers to a component that covers the opening of housing 21 to isolate the internal environment of battery cell 20 from the external environment. The shape of end cap 22 can be adapted to the shape of housing 21 to fit it. Optionally, end cap 22 can be made of a material with certain hardness and strength (such as aluminum alloy), so that end cap 22 is not easily deformed under pressure and impact, allowing battery cell 20 to have higher structural strength and improved safety performance. Functional components such as electrode terminals 24 can be provided on end cap 22. Electrode terminals 24 can be used for electrical connection with electrode assembly 23 for outputting or inputting electrical energy to battery cell 20. In some embodiments, end cap 22 can also be provided with a pressure relief mechanism for releasing internal pressure when the internal pressure or temperature of battery cell 20 reaches a threshold. The material of end cap 22 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose special limitations on this. In some embodiments, an insulating element may be provided on the inner side of the end cap 22. The insulating element can be used to isolate the electrical connection components within the housing 21 from the end cap 22 to reduce the risk of short circuits. For example, the insulating element may be made of plastic, rubber, etc.

[0097] The housing 21 is a component used to cooperate with the end cap 22 to form the internal environment of the battery cell 20. This internal environment can accommodate the electrode assembly 23, electrolyte, and other components. The housing 21 and the end cap 22 can be independent components. An opening can be provided on the housing 21, and the end cap 22 closes the opening to form the internal environment of the battery cell 20. Alternatively, the end cap 22 and the housing 21 can be integrated. Specifically, the end cap 22 and the housing 21 can form a common connecting surface before other components are inserted into the housing. When it is necessary to encapsulate the interior of the housing 21, the end cap 22 closes the housing 21. The housing 21 can have various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing 21 can be determined according to the specific shape and size of the electrode assembly 23. The material of the housing 21 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. This application embodiment does not impose any special limitations on this.

[0098] Electrode assembly 23 is the component in the battery cell 20 where the electrochemical reaction occurs. The casing 21 may contain one or more electrode assemblies 23. The electrode assembly 23 is mainly formed by winding or stacking cathode and anode plates, and typically a separator is provided between the cathode and anode plates. The portions of the cathode and anode plates containing active material constitute the main body of the electrode assembly 23, while the portions of the cathode and anode plates without active material each constitute a tab. The positive and negative tabs may be located together at one end of the end cap body 221 or at both ends of the end cap body 221 respectively. During the charging and discharging process of the battery, the positive and negative active materials react with the electrolyte, and the tabs connect to the electrode terminals 24 to form a current loop.

[0099] Firstly, reference Figures 4 to 7 Some embodiments of this application provide a battery cell 20, including a housing 21, an electrode assembly 23, and an end cap 22. The housing 21 has a receiving cavity 201 with at least one open end; the electrode assembly 23 is received within the receiving cavity 201; the end cap 22 includes an end cap body 221, which is connected to the housing 21 and covers the opening of the receiving cavity 201. A boss 222 protrudes from the side of the end cap body 221 facing the receiving cavity 201, and the boss 222 is spaced apart from the electrode assembly 23. A flange 223 protrudes from the circumferential side of the end cap 22 facing the surface of the receiving cavity 201; in a direction perpendicular to the end cap body 221, the height of the flange 223 is less than or equal to the height of the boss 222.

[0100] In the figure, the X-axis is the length direction of the battery cell 20, the Y-axis is the width direction of the battery cell 20, and the Z-axis is the height direction of the battery cell 20.

[0101] End cap 22 refers to a component that covers the opening of housing 21 to isolate the internal environment of battery cell 20 from the external environment; housing 21 is an assembly used to cooperate with end cap 22 to form the internal environment of battery cell 20.

[0102] The number of end caps 22 can be one or two; when there are two end caps 22, the receiving cavity 201 can have two openings, and the two end caps 22 respectively cover the two openings.

[0103] The cavity 201 refers to the spatial structure formed inside the shell 21, in which the electrode assembly 23, electrolyte or other structures can be accommodated. The cavity 201 can be a cylindrical spatial structure, a prism spatial structure or other spatial structures, and the shape of the cavity 201 can also be set according to the shape of the shell 21.

[0104] The receiving cavity 201 has an opening so that the receiving cavity 201 can communicate with the external environment, and the end cap 22 can form a closed receiving space after closing the opening of the receiving cavity 201.

[0105] Electrode assembly 23 is the component in battery cell 20 where electrochemical reactions occur. Electrode assembly 23 is mainly formed by winding or stacking cathode and anode plates, and usually a separator is provided between the cathode and anode plates. The active material portions of the cathode and anode plates constitute the main body of electrode assembly 23, while the non-active material portions of the cathode and anode plates each constitute a tab.

[0106] The end cap body 221 refers to the structure in the end cap 22 that is mainly used to cover and close the opening of the receiving cavity 201. The end cap body 221 can also provide a fixed foundation for other structures on the end cap 22. The end cap body 221 can be a plate-shaped structure or other structures. The shape of the end cap body 221 can be circular, square or other shapes. The shape of the end cap body 221 can also be set according to the shape of the opening of the receiving cavity 201 and / or the shape of the shell 21. The material of the end cap body 221 can include metal, plastic or other materials.

[0107] The end cap body 221 is connected to the housing 21 to cover and close the opening of the receiving cavity 201, thereby isolating the receiving cavity 201 from the external environment; the end cap body 221 may be connected to the housing 21 by welding, bonding or other means.

[0108] The boss 222 refers to the structure in the end cap 22 that protrudes from the end cap body 221. The boss 222 is located on the side of the end cap body 221 facing the receiving cavity 201 and protrudes in the direction of the receiving cavity 201. The number of bosses 222 can be one, two or more. The boss 222 can be a frustum-shaped structure, a crescent-shaped structure, a frustum-shaped structure or other shapes. The boss 222 is located on the end cap body 221 and can be connected to the end cap body 221 by welding, bonding or other means. The boss 222 can also be integrally formed with the end cap body 221. The material of the boss 222 can include metal, plastic or other materials. The material of the boss 222 can be the same as or different from the material of the end cap body 221.

[0109] The boss 222 is mainly used to provide protection for the adapter 26 in the battery cell 20. The adapter 26 refers to the structure in the battery cell 20 used to connect the tab and the electrode terminal 24. The tab and the electrode terminal 24 can realize the mutual transmission of current and voltage through the adapter 26. The boss 222 protrudes from the end cover body 221 into the receiving cavity 201, and can form a space to accommodate the adapter 26 on the periphery of the boss 222. At the same time, the boss 222 can also provide protection for the adapter 26. In the event of collision or vibration of the battery cell 20, the boss 222 can reduce the shaking and vibration amplitude of the adapter 26, thereby protecting the adapter 26. When there are two or more bosses 222, the adapter 26 can be located in the middle plate of the end cover body 221 and between each boss 222.

[0110] The boss 222 can also be used to increase the strength of the end cap body 221, and at this time the boss 222 can also act as a reinforcing rib.

[0111] Because the boss 222 is located on the side of the end cap body 221 facing the receiving cavity 201, after the end cap body 221 is connected to the housing 21, the boss 222 enters the receiving cavity 201. At this time, the boss 222 is spaced apart from the electrode assembly 23, so that the boss 222 has difficulty contacting the electrode assembly 23 and damaging the electrode assembly 23, and also makes it difficult for the boss 222 to damage the tab.

[0112] Flange 223 refers to the structure in end cap 22 used to assist in fixing end cap body 221. Flange 223 is provided on the side of end cap body 221 facing the receiving cavity 201, and flange 223 is provided on the periphery of the surface of end cap body 221, that is, flange 223 is located at the edge of the surface of end cap body 221 facing the receiving cavity 201. Flange 223 can surround end cap body 221 and form an annular closed structure, or it can be provided only on the edge of end cap body 221. In the extension direction perpendicular to flange 223, the cross-sectional shape of flange 223 can be rectangular, trapezoidal, triangular or other shapes. Flange 223 is connected to end cap body 221. Flange 223 can be connected to end cap body 221 by welding or bonding, or flange 223 can be integrally formed with end cap body 221. The material of flange 223 can include metal, plastic or other materials. The material of flange 223 can be the same as or different from the material of end cap body 221.

[0113] When the flange 223 is connected to the end cap body 221, the flange 223 can be connected to the boss 222, or the flange 223 can be spaced apart from the boss 222; the flange 223 can be intersected with the boss 222, or it can partially or completely correspond to the boss 222; for example, the flange 223 is a closed ring structure surrounding the side of the end cap body 221 facing the receiving cavity 201, and part of the flange 223 is connected to the boss 222.

[0114] When the end cap body 221 is closed over the opening of the receiving cavity 201, the flange 223 can be inserted into the receiving cavity 201 and abut against the inner wall of the housing 21, thereby fixing the end cap body 221; at the same time, the flange 223 can also block the gap between the end cap body 221 and the housing 21, and prevent the electrolyte from overflowing out of the housing 21, thereby helping to improve the sealing performance between the end cap body 221 and the housing 21.

[0115] The direction perpendicular to the end cap body 221 refers to the direction in which the end cap body 221 covers the housing 21. This direction can be the height direction Z of the battery cell 20, or other directions; for example, the direction perpendicular to the end cap body 221 is the height direction Z of the battery cell 20. The dimension of the flange 223 in this direction is the dimension of the flange 223 entering the receiving cavity 201, and the dimension of the boss 222 in this direction is also the dimension of the boss 222 entering the receiving cavity 201. This makes the dimension of the flange 223 in this direction smaller than the dimension of the boss 222 in this direction, so that the flange 223 is less likely to contact the electrode assembly 23 or the tab, thereby reducing the risk of the flange 223 damaging the tab.

[0116] During the installation of the end cap body 221, after the end cap body 221 is connected to the housing 21, the boss 222 and the flange 223 are inserted into the receiving cavity 201. At this time, there is a gap between the boss 222 and the electrode assembly 23, so there is also a gap between the flange 223 and the electrode assembly 23. The boss 222 and the flange 223 are unlikely to damage the electrode tab.

[0117] For example, when the battery cell 20 is a cylindrical battery cell, the tabs of the electrode assembly 23 are formed into a sheet-like structure through a flattening process, and this sheet-like structure is located at both ends of the electrode assembly 23, that is, the sheet-like structure is adjacent to the end cap 22. In this case, the flange 223 is likely to contact the tabs of the sheet-like structure and cause damage to the tabs. Accordingly, this embodiment reduces the risk of the flange 223 contacting the tabs.

[0118] In this embodiment, a boss 222 is provided on the side of the end cap 22 facing the receiving cavity 201 to improve the overall strength of the end cap 22 and provide protection for the adapter 26 inside the housing 21; the height of the flange 223 is less than or equal to the height of the boss 222 so that the flange 223 is difficult to protrude from the boss 222, thereby reducing the risk of the flange 223 contacting and damaging the tab and improving the stability of the battery cell 20.

[0119] refer to Figure 6In some embodiments, the flange 223 includes a first part 2231 and a second part 2232 connected to the first part 2231. The first part 2231 corresponds to the position of the boss 222, and the second part 2232 is offset from the boss 222. In the direction perpendicular to the end cap body 221, the size of the second part 2232 is smaller than the size of the first part 2231.

[0120] The first part 2231 refers to the part of the flange 223 that corresponds to the position of the boss 222. The first part 2231 can be connected to the boss 222 or it can be spaced apart from the boss 222. Depending on the number of bosses 222, the number of first parts 2231 can be one, two or more.

[0121] Because the dimension of the flange 223 in the direction perpendicular to the end cap body 221 is smaller than the dimension of the boss 222 in that direction, the dimension of the first part 2231 in that direction is also smaller than the dimension of the boss 222 in that direction. When the end cap body 221 is connected to the housing 21, the distance between the boss 222 and the electrode assembly 23 is closer. Under the obstruction of the boss 222, the electrode assembly 23 has difficulty contacting the first part 2231, thereby making it difficult for the first part 2231 to contact and damage the tab.

[0122] The second part 2232 refers to the part of the flange 223 that intersects with the boss 222. The second part 2232 is connected to the first part 2231. The second part 2232 can be connected to the first part 2231 by welding, bonding or other means. The second part 2232 and the first part 2231 can also be integrally formed. Depending on the number of the first parts 2231, the number of the second parts 2232 can be one, two or more. When there are two first parts 2231, there can also be two second parts 2232. In this case, the first parts 2231 and the second parts 2232 can be alternately arranged in sequence.

[0123] Because the second part 2232 is offset from the boss 222, when the end cap body 221 is connected to the housing 21, the boss 222 is unlikely to block the second part 2232. Therefore, the size of the second part 2232 in the direction perpendicular to the end cap body 221 is smaller than the size of the first part 2231 in that direction, so as to increase the distance between the second part 2232 and the electrode assembly 23, reduce the risk of the second part 2232 contacting the electrode assembly 23, and thus reduce the risk of the second part 2232 damaging the electrode assembly 23.

[0124] In this embodiment, the flange 223 includes a first part 2231 corresponding to the boss 222 and a second part 2232 offset from the boss 222, and the height of the second part 2232 is less than the height of the first part 2231, so that the second part 2232 offset from the boss 222 is difficult to contact the tab, thereby further reducing the risk of the flange 223 contacting and damaging the tab.

[0125] refer to Figure 7 In some embodiments, the height of the flange 223 in the direction perpendicular to the end cap body 221 is less than or equal to 2 mm.

[0126] The dimension of flange 223 in the direction perpendicular to end cap body 221 is the height of flange 223, which is also the dimension shown by H in the figure. This dimension is less than or equal to 2 mm; for example, this dimension can be 2 mm, 1.5 mm, 1 mm, 0.5 mm, 0.01 mm or other values.

[0127] The smaller the size of the flange 223 in the direction perpendicular to the end cap body 221, the less likely the flange 223 is to contact the electrode assembly 23 and the less likely it is to damage the electrode assembly 23; at the same time, the smaller the size of the flange 223 in this direction, the less the flange 223 has an auxiliary fixing effect and sealing effect on the end cap body 221.

[0128] For example, the flange 223 can be 2mm in the direction perpendicular to the end cap body 221. In this case, the flange 223 can not only help fix the end cap body 221, but also block the gap between the end cap body 221 and the housing 21. At the same time, the flange 223 is also difficult to contact and damage the electrode assembly 23.

[0129] For example, the flange 223 can have a dimension of 0.01 mm in the direction perpendicular to the end cap body 221, making it more difficult for the flange 223 to contact and damage the electrode assembly 23.

[0130] This embodiment provides a range of height dimensions for the flange 223 to reduce the risk of the flange 223 contacting the tab, reduce the risk of the tab being damaged, and improve the stability of the battery cell 20.

[0131] refer to Figure 7 In some embodiments, the height of the flange 223 in the direction perpendicular to the end cap body 221 ranges from 0.4 mm to 1 mm.

[0132] The dimension of flange 223 in the direction perpendicular to end cap body 221 is the height of flange 223, which is also the dimension shown by H in the figure. This dimension ranges from 0.4mm to 1mm; for example, this dimension can be 1mm, 0.85mm, 0.7mm, 0.55mm, 0.4mm, or other values.

[0133] The smaller the size of the flange 223 in the direction perpendicular to the end cap body 221, the less likely the flange 223 is to contact the electrode assembly 23 and the less likely it is to damage the electrode assembly 23; at the same time, the smaller the size of the flange 223 in this direction, the less the flange 223 has an auxiliary fixing effect and sealing effect on the end cap body 221.

[0134] For example, the flange 223 can be 1 mm in the direction perpendicular to the end cap body 221. In this case, the flange 223 can not only help fix the end cap body 221, but also block the gap between the end cap body 221 and the housing 21. At the same time, the flange 223 is also difficult to contact and damage the electrode assembly 23.

[0135] For example, the flange 223 can have a dimension of 0.7 mm in the direction perpendicular to the end cap body 221. In this case, the flange 223 is unlikely to contact or damage the electrode assembly 23, and also has a certain auxiliary fixing and sealing effect.

[0136] For example, the flange 223 can have a dimension of 0.4 mm in the direction perpendicular to the end cap body 221, in which case the flange 223 is less likely to contact and damage the electrode assembly 23.

[0137] This embodiment further provides a range of flange heights for the flange 223 to reduce the risk of the flange 223 contacting and damaging the tabs, while also enabling the flange 223 to assist in fixing the end cap 22 so that the end cap 22 can be better connected to the housing 21.

[0138] refer to Figure 8 , Figure 9 In some embodiments, the battery cell 20 further includes a protective member 25 housed within a housing cavity 201, at least a portion of which is disposed between the end cap 22 and the electrode assembly 23; the projection of the protective member 25 onto the end cap 22 surrounds the projection of the electrode assembly 23 onto the end cap 22, and the projection of the protective member 25 onto the end cap 22 is offset from the projection of the electrode assembly 23 onto the end cap 22.

[0139] The protective component 25 refers to the structure in the battery cell 20 used to protect the tab. The protective component 25 can prevent the tab from directly contacting and conducting with the housing 21, thereby reducing the risk of short circuit between the tab and the housing 21. The protective component 25 can be a cylindrical structure, a square structure or other shapes surrounding the tab. The material of the protective component 25 can include metal, plastic or other materials.

[0140] At least a portion of the protective member 25 is located between the end cap 22 and the electrode assembly 23. Since the adapter 26 is located in the space between the electrode assembly 23 and the end cap 22, and one end of the adapter 26 is connected to the electrode tab and the other end of the adapter 26 is connected to the electrode terminal 24, at least a portion of the protective member 25 is located between the end cap 22 and the electrode assembly 23 to protect the electrode tab and the connection between the electrode tab and the adapter 26. The protective member 25 may be partially located between the end cap 22 and the electrode assembly 23, and the remaining portion of the protective member 25 may surround the main body of the electrode assembly 23. The protective member 25 may also be completely located between the end cap 22 and the electrode assembly 23.

[0141] At least a portion of the protective element 25 is located between the end cap 22 and the electrode assembly 23. In this case, the protective element 25 can be connected to the end cap 22, for example, to the end cap body 221 or the boss 222 or the flange 223. The protective element 25 can also be spaced apart from the end cap 22, for example, connected to the housing 21.

[0142] The projection of the protective element 25 on the end cap 22 surrounds the projection of the electrode assembly 23 on the end cap 22. That is, the protective element 25 is located on the periphery of the electrode assembly 23 and surrounds the electrode assembly 23 to prevent the tab from contacting the housing 21 and reduce the risk of short circuit between the tab and the housing 21.

[0143] The projection of the protective component 25 onto the end cap 22 is offset from the projection of the electrode assembly 23 onto the end cap 22, meaning that the protective component 25 and the electrode assembly 23 do not interfere with each other. The space enclosed by the protective component 25 can be greater than or equal to the cross-sectional area of ​​the electrode assembly 23 on a plane parallel to the end cap body 221, thereby reducing the risk that the protective component 25 may damage the electrode assembly 23.

[0144] Since at least a portion of the protective member 25 is located between the electrode assembly 23 and the end cap 22, and the projection of the protective member 25 onto the end cap 22 surrounds the projection of the electrode assembly 23 onto the end cap 22, thus, when the main body of the electrode assembly 23 is a cylindrical structure and the tab is a circular sheet structure, at least a portion of the protective member 25 can surround the tab. When the main body of the electrode assembly 23 is a cuboid structure and the tab is a strip structure, at least a portion of the protective member 25 can also surround the tab.

[0145] For example, the battery cell 20 is a cylindrical battery cell, the main body of the electrode assembly 23 is a cylindrical structure, the tab of the electrode assembly 23 is a circular thin sheet structure and is located at least on the side of the electrode assembly 23 facing the end cap 22, and the protective member 25 is a cylindrical structure, with at least a portion of the protective member 25 surrounding the tab.

[0146] In this embodiment, a protective member 25 is provided and surrounds the electrode assembly 23 to reduce the risk of short circuit between the tab and the housing 21, and at the same time reduce the risk of electrolyte leakage; the projection of the protective member 25 is offset from the projection of the electrode assembly 23 to reduce the risk of the protective member 25 damaging the tab or the electrode assembly 23, and further improve the stability of the battery device 100.

[0147] refer to Figures 8 to 12 In some embodiments, the protective element 25 is connected to the end cap 22.

[0148] The protective component 25 is connected to the end cap 22. The protective component 25 can be connected to the end cap body 221, or to the boss 222, flange 223, or other structures of the end cap 22. Depending on the material of the protective component 25, the protective component 25 can be connected to the end cap 22 by welding, bonding, or other means.

[0149] The protective element 25 is connected to the end cap 22 to better prevent the tab from short-circuiting with the housing 21 through the protective element 25. At the same time, in addition to protecting the tab, the protective element 25 can also prevent the electrolyte from flowing to the connection between the end cap 22 and the housing 21, thus helping to improve the sealing performance of the battery cell 20. During the process of connecting the end cap 22 to the housing 21, or during the installation of other structures, the protective element 25 can also prevent welding slag, welding liquid, adhesive liquid or other impurities from falling onto the tab or electrode assembly 23.

[0150] In this embodiment, the protective member 25 is connected to the end cap 22 to facilitate the installation and fixation of the protective member 25; at the same time, the gap between the end cap 22 and the protective member 25 can be reduced or eliminated, reducing the risk of the tab short-circuiting with the housing 21 through the gap, and also reducing the risk of electrolyte leakage through the gap.

[0151] In some embodiments, the electrode assembly 23 has a first end 233 facing the end cap 22, and the end of the protective member 25 away from the end cap 22 is flush with the end of the electrode assembly 23 facing the end cap 22.

[0152] The end of the protective component 25 that faces away from the end cap 22 is also the end of the protective component 25 that faces the electrode assembly 23.

[0153] The first end 233 refers to the end of the electrode assembly 23 facing the adjacent end cap 22. When the battery cell 20 includes one end cap 22, the electrode assembly 23 has one first end 233. When the battery cell 20 includes two end caps 22, the electrode assembly 23 has two first ends 233 facing the two end caps 22 respectively. For cylindrical battery cells, the tabs of the electrode assembly 23 are sheet-like structures, and the first end 233 can be a sheet-like tab. In this case, the protective member 25 can also restrict the displacement of the tab within the housing 21 and prevent the tab from short-circuiting with the housing 21. The first end 233 can also be the end of the main body of the electrode assembly 23 facing the end cap 22. In this case, the plane where this end is located is the plane where the diaphragm in the electrode assembly 23 faces the side of the end cap 22. That is, the end of the protective member 25 away from the end cap 22 is flush with the diaphragm. In this case, the protective member 25 can completely surround the tab of the electrode assembly 23 to prevent the tab from short-circuiting with the housing 21.

[0154] For a prismatic battery cell, the tabs of the electrode assembly 23 are strip-shaped structures. The first end 233 can be the end of the main body of the electrode assembly 23 facing the end cover 22. At this time, the plane where this end is located is the plane where the diaphragm in the electrode assembly 23 faces the side of the end cover 22. That is, the end of the protective member 25 away from the end cover 22 is flush with the diaphragm. At this time, the protective member 25 can completely surround the tabs of the electrode assembly 23 to prevent the tabs from short-circuiting with the housing 21.

[0155] By aligning the end of the protective member 25 away from the end cap 22 with the first end 233, the protective member 25 can be prevented from overlapping with the main body of the electrode assembly 23. This reduces the space occupied by the protective member 25 in the main body of the electrode assembly 23 and minimizes the negative impact of the protective member 25 on the energy density of the battery cell 20. At the same time, the protective member 25 can also prevent the tab from short-circuiting with the housing 21.

[0156] In this embodiment, the protective component 25 can both protect the electrode assembly 23 to reduce the risk of short circuit between the electrode tab and the housing 21, and reduce the space occupied by the protective component 25.

[0157] refer to Figures 10 to 12 In some embodiments, the electrode assembly 23 has a first end 233 facing the end cap 22, and the end of the protective member 25 facing away from the end cap 22 extends beyond the plane of the first end 233.

[0158] The end of the protective component 25 facing away from the end cover 22 extends beyond the plane where the first end 233 is located. That is, part of the protective component 25 can overlap with the electrode assembly 23 to better protect the electrode tab and better prevent the electrode tab from short-circuiting with the housing 21.

[0159] For a cylindrical battery cell, the tabs of the electrode assembly 23 are sheet-like structures. The plane where the first end 233 is located can be the plane where the sheet-like tab is located. The plane where the first end 233 is located can also be the plane where the main body of the electrode assembly 23 faces the end cap 22. In this case, the plane where this end is located is the plane where the separator in the electrode assembly 23 faces the side of the end cap 22. That is, the end of the protective member 25 away from the end cap 22 at least overlaps with the separator.

[0160] For a square battery cell, the tabs of the electrode assembly 23 are strip-shaped structures. The plane where the first end 233 is located can be the plane where the main body of the electrode assembly 23 faces the end cap 22. At this time, the plane where this end is located is the plane where the diaphragm in the electrode assembly 23 faces the side of the end cap 22. That is, the end of the protective member 25 away from the end cap 22 at least overlaps with the diaphragm.

[0161] refer to Figure 12 In the figure, the part corresponding to L1 is the part of the protective member 25 that crosses the plane of the end of the electrode assembly 23 facing the end cap 22, and is also the part of the protective member 25 that overlaps with the electrode assembly 23.

[0162] In this configuration, a portion of the protective element 25 protects the electrode tab, preventing short circuit between the electrode tab and the housing 21. The overlapping portion of the protective element 25 and the electrode assembly 23 also constrains the shape of the electrode assembly 23. Since the electrode assembly 23 is typically formed by lamination or winding, it is susceptible to deformation, springback, and loosening. Therefore, the overlapping portion of the protective element 25 and the electrode assembly 23 also constrains the shape of the electrode assembly 23 and inhibits movement, thus improving its stability.

[0163] In this embodiment, the end of the protective member 25 away from the end cover 22 extends to the end of the electrode assembly 23 facing the end cover 22, so that a part of the protective member 25 can overlap with the electrode assembly 23, thereby enabling the protective member 25 to better protect the electrode tab and reduce the risk of short circuit between the electrode tab and the housing 21; at the same time, this arrangement can also constrain the electrode assembly 23.

[0164] refer to Figures 10 to 12 In some embodiments, the distance between the end of the protective member 25 away from the end cap 22 and the plane where the first end 233 is located is in the range of 2mm to 3mm.

[0165] The distance between the end of the protective member 25 facing away from the end cap 22 and the plane containing the first end 233 is the height of the overlapping portion of the protective member 25 and the electrode assembly 23; Reference Figure 12 This spacing is the dimension corresponding to L1 in the figure.

[0166] The larger the spacing, the more the protective element 25 overlaps with the electrode assembly 23. The portion of the protective element 25 located between the electrode assembly 23 and the end cap 22 can more stably protect the tab and prevent the tab from short-circuiting with the housing 21. At the same time, the protective element 25 can also better constrain the electrode assembly 23. However, the larger the spacing, the more space the protective element 25 occupies, and the lower the energy density of the battery cell 20 is.

[0167] Accordingly, the spacing is set to a range of 2mm to 3mm so that the protective member 25 can both protect the tab and constrain the electrode assembly 23, and also reduce the space occupied by the protective member 25; for example, the spacing can be 2mm, 2.4mm, 2.5mm, 2.6mm, 2.8mm, 3mm or other values.

[0168] For example, the distance between the end of the protective member 25 away from the end cap 22 and the plane where the first end 233 is located can be 2mm. In this case, the protective member 25 can protect the tab and constrain the electrode assembly 23, while the space occupied by the protective member 25 is small.

[0169] For example, the distance between the end of the protective member 25 away from the end cap 22 and the plane where the first end 233 is located can be 2.5mm. In this case, the protective member 25 can more stably protect the electrode tab and better constrain the electrode assembly 23; at the same time, the space occupied by the protective member 25 will not be too large.

[0170] For example, the distance between the end of the protective member 25 away from the end cap 22 and the plane where the first end 233 is located can be 3mm. In this case, the protective member 25 can further stabilize and protect the electrode tab and provide greater constraint on the electrode assembly 23.

[0171] This embodiment provides some specific size ranges for the overlap between the protective element 25 and the electrode assembly 23, so that the protective element 25 can not only protect the electrode tab and constrain the electrode assembly 23, but also reduce the space occupied by the protective element 25.

[0172] refer to Figures 10 to 12 In some embodiments, the protective member 25 is connected to the side of the boss 222 or the flange 223, and the distance between the protective member 25 and the end cap body 221 is less than the height of the boss 222.

[0173] The side of the boss 222 refers to the side of the boss 222 other than the side facing the electrode assembly 23. The side of the boss 222 can be the side facing the inner wall of the housing 21 or other sides of the boss 222. The protective member 25 is connected to the side of the boss 222, that is, the protective member 25 does not need to be connected to the end cap body 221. Since the end cap body 221 is also provided with structures such as the boss 222, the flange 223, and the adapter 26, the space on the end cap body 221 is limited. If the protective member 25 is placed on the end cap body 221, it will easily occupy the limited space on the end cap body 221. Moreover, it is difficult to fix the protective member 25 between other structures on the end cap body 221. Therefore, the protective member 25 is placed on the boss 222 to facilitate the fixed installation of the protective member 25 and also to reduce the space occupied by the protective member 25 on the end cap body 221.

[0174] The side surface of flange 223 refers to the surface of flange 223 other than that facing electrode assembly 23. The side surface of flange 223 can be the surface facing the inner wall of housing 21, or any other surface of flange 223. For example, protective member 25 is connected to the side of flange 223 facing the inner wall of housing 21. Because the portion of flange 223 facing away from the inner wall of housing 21 is adjacent to or connected to boss 222, and protective member 25 is a structure surrounding electrode assembly 23, connecting protective member 25 to the side of flange 223 facing away from the inner wall of housing 21 is more difficult. Connecting protective member 25 to the side of flange 223 also reduces the space occupied by protective member 25 on end cap body 221 and reduces the difficulty of connecting and installing protective member 25.

[0175] Understandably, the protective member 25 can be connected to either the boss 222 or the flange 223. For example, when the height difference between the boss 222 and the flange 223 is large, the protective member 25 is connected to the boss 222; for example, when the height difference between the boss 222 and the flange 223 is small, the protective member 25 is connected to the flange 223.

[0176] The distance between the protective member 25 and the end cap body 221 is less than the height of the boss 222, that is, at least part of the protective member 25 overlaps with the boss 222 or the flange 223, that is, the protective member 25 is connected to the side of the boss 222 or the flange 223. This arrangement can reduce the gap between the protective member 25 and the end cap body 221, so that the protective member 25 can better prevent the electrode tab from short-circuiting with the housing 21, and can better prevent the risk of external impurities (such as welding slag, welding liquid, etc.) falling on the electrode tab and electrode assembly 23, and can also prevent the electrolyte from flowing to the connection between the end cap 22 and the housing 21.

[0177] In this embodiment, the protective member 25 is connected to the side of the boss 222 or the flange 223. Since the space on the side of the end cap body 221 facing the receiving cavity 201 is limited, connecting the protective member 25 to the boss 222 or the flange 223 can reduce the space occupied by the protective member 25 on the end cap body 221 and also reduce the processing difficulty.

[0178] refer to Figures 10 to 12 In some embodiments, the size of the connection between the protective member 25 and the boss 222 or flange 223 in the direction perpendicular to the end cap body 221 ranges from 0.1 mm to 0.5 mm.

[0179] The direction perpendicular to the end cap body 221 refers to the direction in which the end cap body 221 covers the housing 21. This direction can be the height direction Z of the battery cell 20 or other directions; for example, the direction perpendicular to the end cap body 221 is the height direction Z of the battery cell 20.

[0180] The connection point between the protective member 25 and the boss 222 or the flange 223 is the part where the protective member 25 is connected to the boss 222 or the flange 223. The dimension of the connection point between the protective member 25 and the boss 222 or the flange 223 in the direction perpendicular to the end cap body 221 is the dimension shown in L2 in the figure. The dimension ranges from 0.1mm to 0.5mm; for example, the dimension can be 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm or other values.

[0181] The dimension of the connection between the protective element 25 and the boss 222 or the flange 223 in the direction perpendicular to the end cap body 221 is positively correlated with the connection stability between the protective element 25 and the boss 222 or the flange 223. The larger the dimension, the more stable the connection between the protective element 25 and the boss 222 or the flange 223, the smaller the gap between the protective element 25 and the end cap body 221, the better the protection effect of the protective element 25 on the electrode tab, and the larger the space occupied by the protective element 25.

[0182] For example, the dimension of the connection between the protective member 25 and the boss 222 or the flange 223 in the direction perpendicular to the end cap body 221 can be 0.1mm. In this case, the protective member 25 is connected to the boss 222 or the flange 223, and the space occupied by the protective member 25 is small.

[0183] For example, the dimension of the connection between the protective member 25 and the boss 222 or the flange 223 in the direction perpendicular to the end cap body 221 can be 0.3mm. At this time, the protective member 25 can be connected to the boss 222 or the flange 223 relatively stably, and the protective member 25 can effectively prevent the electrode tab from short-circuiting with the housing 21; at the same time, the space occupied by the protective member 25 is also moderate.

[0184] For example, the dimension of the connection between the protective member 25 and the boss 222 or the flange 223 in the direction perpendicular to the end cap body 221 can be 0.5mm. In this case, the protective member 25 can be more stably connected to the boss 222 or the flange 223, and the protective member 25 can better prevent the electrode tab from short-circuiting with the housing 21.

[0185] This embodiment provides a range of dimensions for the connection between the protective component 25 and the boss 222 or the flange 223, which can not only make the protective component 25 stably connected to the boss 222 or the flange 223, but also reduce the space occupied by the protective component 25 near the end cap 22.

[0186] refer to Figures 10 to 12 In some embodiments, the distance between the protective member 25 and the end cap body 221 is in the range of 0.2mm to 0.5mm.

[0187] Because the protective component 25 is connected to the boss 222 or the flange 223, there is a gap between the protective component 25 and the end cap body 221. The distance between the protective component 25 and the end cap body 221 is the dimension of this gap on a square perpendicular to the end cap body 221, which is... Figure 12 The dimension shown in L3 is in the range of 0.2mm to 0.5mm; for example, the dimension range can be 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.5mm or other values.

[0188] The distance between the protective component 25 and the end cap body 221 is positively correlated with the protective performance of the protective component 25 for the electrode tab. The smaller the distance between the protective component 25 and the end cap body 221, the more difficult it is for the electrode tab to short-circuit with the housing 21. At the same time, the smaller the distance between the protective component 25 and the end cap body 221, the larger the space occupied by the protective component 25, and the greater the installation difficulty caused by interference from other structures on the end cap body 221.

[0189] For example, the distance between the protective element 25 and the end cap body 221 can be 0.2mm. At this time, the protective element 25 is closer to the end cap 22, and the protective element 25 can better protect the tab to prevent the tab from short-circuiting with the housing 21.

[0190] For example, the distance between the protective element 25 and the end cap body 221 can be 0.35mm. At this time, the distance between the protective element 25 and the end cap 22 is moderate. The protective element 25 can not only protect the electrode tab well to prevent the electrode tab from short-circuiting with the housing 21, but also make the installation and connection of the protective element 25 moderate.

[0191] For example, the distance between the protective component 25 and the end cap body 221 can be 0.5mm. At this time, the installation difficulty of the protective component 25 is low and the space occupied is small; at the same time, the protective component 25 can also play the role of protecting the electrode tab.

[0192] This embodiment provides a range of spacing between the protective component 25 and the end cap body 221, which can reduce the space occupied by the protective component 25 and also protect the electrode tab, reducing the risk of short circuit between the electrode tab and the housing 21. Since the protective component 25 is connected to the boss 222, this size range also limits the height of the boss 222, so that the boss 222 can better improve the overall strength of the end cap 22 and provide protection for the adapter 26.

[0193] During the exam Figures 10 to 12 In some embodiments, the thickness of the protective element 25 ranges from 40 μm to 70 μm.

[0194] The thickness range of the protective element 25 refers to the dimension of the protective element 25 perpendicular to its extension direction, which ranges from 40μm to 70μm; for example, the dimension can be 40μm, 45μm, 50μm, 55μm, 60μm, 65μm, 70μm or other values.

[0195] The thickness of the protective component 25 is positively correlated with its strength. The greater the thickness of the protective component 25, the greater its strength and the better its protection of the electrode tab. At the same time, the greater the thickness of the protective component 25, the more space it occupies.

[0196] For example, the thickness of the protective element 25 can be 40μm. In this case, the thickness of the protective element 25 is small, the space occupied by the protective element 25 is small, and the protective element 25 can also prevent the tab from short-circuiting with the housing 21.

[0197] For example, the thickness of the protective element 25 can be 55μm. At this thickness, the protective element 25 is moderate. The protective element 25 can not only provide good protection for the electrode tab to prevent short circuit between the electrode tab and the housing 21, but also ensure that the space occupied by the protective element 25 is not too large.

[0198] For example, the thickness of the protective element 25 can be 70 μm. At this thickness, the protective element 25 can better protect the electrode tab and prevent the electrode tab from short-circuiting with the housing 21. At the same time, when part of the protective element 25 overlaps with the electrode assembly 23, the protective element 25 can also better constrain the electrode assembly 23.

[0199] This embodiment provides a range of thicknesses for the protective element 25 so that the protective element 25 can both protect the electrode tab and reduce the space occupied by the protective element 25.

[0200] In some embodiments, the material of the protective member 25 includes at least plastic, and the protective member 25 is connected to the end cap 22 by a hot-melt process.

[0201] The protective component 25 is made of plastic, which has advantages such as light weight, chemical resistance, good insulation, and good waterproof performance; it is understood that the protective component 25 may also include other materials, not just plastic.

[0202] The protective component 25 is made of plastic so that it has good insulation properties, thereby reducing the risk of short circuit between the tab and the housing 21; at the same time, it also enables the protective component 25 to adapt to the electrochemical environment inside the housing 21, has a long service life, and reduces the negative impact of the protective component 25 on the overall weight of the battery cell 20.

[0203] Hot-melt process refers to a process method that melts and connects materials by heating. The connection structure formed by hot-melt process is relatively stable and has high strength, and the sealing performance of the connection part is also high. It can make the protective part 25 more stably connected to the end cap 22 and can prevent the electrolyte from flowing to the connection between the end cap 22 and the shell 21. At the same time, hot-melt process does not require additional consumables (such as fasteners, solvents, glue, etc.), which can reduce the space occupied by the protective part 25 and reduce the negative impact of the protective part 25 on the energy density of the battery cell 20.

[0204] This embodiment provides specific materials for some protective components 25 so that the protective components 25 can not only protect the tabs and reduce the risk of short circuit between the tabs and the housing 21, but also reduce the weight of the protective components 25 and improve the service life of the protective components 25 in the electrolyte environment; and connect the protective components 25 to the end cap 22 through a hot melt process so that the protective components 25 can be connected to the end cap 22 relatively stably.

[0205] refer to Figure 4 In some embodiments, the electrode assembly 23 includes a cathode tab 231 disposed adjacent to the end cap 22.

[0206] The cathode is the positive electrode of the electrode assembly 23. During the charging process of the battery cell 20, the cathode receives electrons from the external power source. During the discharging process of the battery cell 20, the cathode receives lithium ions. The cathode tab 231 refers to the metal conductive structure extending from the cathode current collector. The cathode tab 231 is used to conduct current from the cathode active material to the external circuit.

[0207] A short circuit between the cathode tab 231 and the housing 21 may cause excessive local current and temperature rise, leading to thermal runaway of the battery cell 20. It may also cause an increase in internal pressure of the battery cell 20 and damage to the housing 21. Therefore, the cathode tab 231 is positioned near the end cap 22. In this case, the flange 223 of the end cap 22 is unlikely to damage the cathode tab 231, and the protective member 25 can prevent the cathode tab 231 from short-circuiting with the housing 21, thereby protecting the cathode tab 231.

[0208] For the end cap 22 corresponding to the cathode tab 231, the protective member 25 can be connected to the end cap 22 or spaced apart from the end cap 22. It is understood that there can be two end caps 22. In this case, one of the two end caps 22 can be adjacent to the cathode tab 231. In this case, the protective member 25 corresponding to the end cap 22 can be connected to the end cap 22 or spaced apart from the end cap 22.

[0209] In this embodiment, the end cap 22 is adjacent to the cathode tab 231 of the electrode assembly 23. At this time, the protective member 25 can be connected to the end cap 22 or spaced apart from the end cap 22 so that the protective member 25 can be arranged as needed.

[0210] refer to Figure 4 In some embodiments, the electrode assembly 23 includes an anode tab 232 disposed adjacent to the end cap 22.

[0211] The anode refers to the negative electrode of the electrode assembly 23. During the charging process of the battery cell 20, the anode receives lithium ions for insertion. During the discharging process of the battery cell 20, the anode releases lithium ions and releases electrons to the external circuit to form a current.

[0212] A short circuit between the anode tab 232 and the casing 21 could result in excessive local current and temperature rise, potentially leading to thermal runaway of the battery cell 20. It could also cause increased internal pressure within the battery cell 20, potentially damaging the casing 21. Therefore, the anode tab 232 is positioned adjacent to the end cap 22. In this configuration, the flange 223 of the end cap 22 is less likely to damage the anode tab 232, and the protective element 25 prevents a short circuit between the anode tab 232 and the casing 21, thus protecting the anode tab 232.

[0213] Compared to the short circuit of the anode lug 232, the risk of a short circuit of the anode lug 232 is relatively greater. Therefore, for the end cap 22 corresponding to the anode lug 232, a protective member 25 is connected to the end cap 22 to further reduce the risk of a short circuit between the anode lug 232 and the housing 21. It is understandable that there can be two end caps 22, in which case one of the two end caps 22 can be adjacent to the anode lug 232, and the protective member 25 corresponding to that end cap 22 is connected to that end cap 22.

[0214] In this embodiment, the end cap 22 is placed adjacent to the anode lug 232 of the electrode assembly 23. At this time, the protective member 25 is connected to the end cap 22 to better reduce the risk of short circuit between the anode lug 232 and the housing 21.

[0215] refer to Figure 4 In some embodiments, the battery cell 20 has a cylindrical structure.

[0216] The battery cell 20 has a cylindrical structure, that is, the battery cell 20 is a cylindrical battery cell. At this time, the main body of the electrode assembly 23 also has a cylindrical structure, while the tabs of the electrode assembly 23 have a circular thin sheet structure.

[0217] In cylindrical battery cells, the tabs are more susceptible to damage and failure. Therefore, the end cap 22 is applied to cylindrical battery cells to reduce the risk of the flange 223 damaging the tabs and to enable the protective component 25 to better protect the tabs.

[0218] In this embodiment, the battery cell 20 is made into a cylindrical structure. In a cylindrical battery cell 20, the tabs are more susceptible to damage from the flanges 223. Therefore, the battery cell 20 is made into a cylindrical structure to reduce the risk of damage to the tabs.

[0219] In some embodiments, the battery cell 20 includes an end cap 22, a housing 21, an electrode assembly 23, and a protective element 25; wherein the battery cell 20 is a cylindrical battery cell.

[0220] The housing 21 has a receiving cavity 201 with openings at both ends, and the electrode assembly 23 is received in the receiving cavity 201; there are two end caps 22, which respectively cover the two openings of the two receiving cavities 201.

[0221] The end cap 22 includes an end cap body 221 and a boss 222 and a flange 223 connected to the end cap body 221. The end cap body 221 is connected to the housing 21 and covers the opening of the corresponding receiving cavity 201. The end cap body 221 is a circular plate structure.

[0222] The boss 222 is located on the side of the end cap body 221 facing the receiving cavity 201. There are two bosses 222 and they are symmetrical about the center of the end cap body 221. The boss 222 is an arc block structure, and the space between the two bosses 222 is used to accommodate the adapter 26.

[0223] The flange 223 is provided on the side of the end cap body 221 facing the receiving cavity 201 and is arranged around the edge of the surface of the end cap body 221 facing the receiving cavity 201, that is, the flange 223 is a ring structure; in the height direction Z of the battery cell 20, the height of the flange 223 is less than the height of the boss 222.

[0224] The protective member 25 has a cylindrical structure. One end of the protective member 25 is connected to the side of the boss 222, and the other end of the protective member 25 extends beyond the tab and partially overlaps with the main body of the electrode assembly 23. The part of the protective member 25 that overlaps with the main body of the electrode assembly 23 corresponds to a part of the diaphragm.

[0225] Secondly, embodiments of this application also provide a battery cell 20, similar to the battery cell 20 provided in some embodiments of the first aspect. This battery cell 20 also includes a housing 21, an electrode assembly 23, and an end cap 22. The housing 21 has a receiving cavity 201 with at least one open end; the electrode assembly 23 is received within the receiving cavity 201; the end cap 22 includes an end cap body 221, which is connected to the housing 21 and covers the opening of the receiving cavity 201. A boss 222 protrudes from the side of the end cap body 221 facing the receiving cavity 201.

[0226] The battery cell 20 also includes a protective member 25, which is connected to the side of the boss 222. At least a portion of the protective member 25 is disposed between the end cap 22 and the electrode assembly 23. The projection of the protective member 25 on the end cap 22 surrounds the projection of the electrode assembly 23 on the end cap 22, and the projection of the protective member 25 on the end cap 22 is offset from the projection of the electrode assembly 23 on the end cap 22.

[0227] End cap 22 refers to a component that covers the opening of housing 21 to isolate the internal environment of battery cell 20 from the external environment; housing 21 is an assembly used to cooperate with end cap 22 to form the internal environment of battery cell 20.

[0228] The number of end caps 22 can be one or two; when there are two end caps 22, the receiving cavity 201 can have two openings, and the two end caps 22 respectively cover the two openings.

[0229] The cavity 201 refers to the spatial structure formed inside the shell 21, in which the electrode assembly 23, electrolyte or other structures can be accommodated. The cavity 201 can be a cylindrical spatial structure, a prism spatial structure or other spatial structures, and the shape of the cavity 201 can also be set according to the shape of the shell 21.

[0230] The receiving cavity 201 has an opening so that the receiving cavity 201 can communicate with the external environment, and the end cap 22 can form a closed receiving space after closing the opening of the receiving cavity 201.

[0231] The end cap body 221 refers to the structure in the end cap 22 that is mainly used to cover and close the opening of the receiving cavity 201. The end cap body 221 can also provide a fixed foundation for other structures on the end cap 22.

[0232] The end cap body 221 is connected to the housing 21 to cover and close the opening of the receiving cavity 201, thereby isolating the receiving cavity 201 from the external environment; the end cap body 221 may be connected to the housing 21 by welding, bonding or other means.

[0233] The boss 222 refers to the structure in the end cap 22 that protrudes from the end cap body 221. The boss 222 is located on the side of the end cap body 221 facing the receiving cavity 201 and protrudes in the direction of the receiving cavity 201.

[0234] The boss 222 is mainly used to protect the adapter 26 in the battery cell 20. The adapter 26 refers to the structure in the battery cell 20 used to connect the tab and the electrode terminal 24. The tab and the electrode terminal 24 can realize the mutual transmission of current and voltage through the adapter 26. The boss 222 protrudes from the end cover body 221 into the receiving cavity 201, forming a space around the boss 222 to accommodate the adapter 26. At the same time, the boss 222 can also protect the adapter 26. In the event of collision or vibration of the battery cell 20, the boss 222 can reduce the shaking and vibration amplitude of the adapter 26, thereby protecting the adapter 26. When there are two or more bosses 222, the adapter 26 can be located in the middle plate of the end cover body 221 and between the various bosses 222. The boss 222 can also be used to improve the strength of the end cover body 221, in which case the boss 222 can also act as a reinforcing rib.

[0235] Because the boss 222 is located on the side of the end cap body 221 facing the receiving cavity 201, after the end cap body 221 is connected to the housing 21, the boss 222 enters the receiving cavity 201. At this time, the boss 222 is spaced apart from the electrode assembly 23, so that the boss 222 has difficulty contacting the electrode assembly 23 and damaging the electrode assembly 23, and also makes it difficult for the boss 222 to damage the tab.

[0236] The protective component 25 refers to the structure in the battery cell 20 used to protect the tab. The protective component 25 can prevent the tab from directly contacting and conducting with the housing 21, thereby reducing the risk of short circuit between the tab and the housing 21. The protective component 25 can be a cylindrical structure, a square structure or other shapes surrounding the tab. The material of the protective component 25 can include metal, plastic or other materials.

[0237] The side of the boss 222 refers to the side of the boss 222 other than the side facing the electrode assembly 23. The side of the boss 222 can be the side facing the inner wall of the housing 21 or other sides of the boss 222. The protective member 25 is connected to the side of the boss 222, that is, the protective member 25 does not need to be connected to the end cap body 221. Since the end cap body 221 is also provided with structures such as the boss 222, the flange 223, and the adapter 26, the space on the end cap body 221 is limited. If the protective member 25 is placed on the end cap body 221, it will easily occupy the space of the end cap body 221. Moreover, it is difficult to fix the protective member 25 between other structures on the end cap body 221. Therefore, the protective member 25 is placed on the boss 222 to facilitate the fixed installation of the protective member 25 and also to reduce the space occupied by the protective member 25 on the end cap body 221.

[0238] At least a portion of the protective member 25 is located between the end cap 22 and the electrode assembly 23. Since the adapter 26 is located in the space between the electrode assembly 23 and the end cap 22, and one end of the adapter 26 is connected to the electrode tab and the other end of the adapter 26 is connected to the electrode terminal 24, at least a portion of the protective member 25 is located between the end cap 22 and the electrode assembly 23 to protect the electrode tab and the connection between the electrode tab and the adapter 26. The protective member 25 may be partially located between the end cap 22 and the electrode assembly 23, and the remaining portion of the protective member 25 may surround the main body of the electrode assembly 23. The protective member 25 may also be completely located between the end cap 22 and the electrode assembly 23.

[0239] At least a portion of the protective element 25 is located between the end cap 22 and the electrode assembly 23. In this case, the protective element 25 can be connected to the end cap 22, for example, to the end cap body 221 or the boss 222 or the flange 223. The protective element 25 can also be spaced apart from the end cap 22, for example, connected to the housing 21.

[0240] The projection of the protective element 25 on the end cap 22 surrounds the projection of the electrode assembly 23 on the end cap 22. That is, the protective element 25 is located on the periphery of the electrode assembly 23 and surrounds the electrode assembly 23 to prevent the tab from contacting the housing 21 and reduce the risk of short circuit between the tab and the housing 21.

[0241] The projection of the protective component 25 onto the end cap 22 is offset from the projection of the electrode assembly 23 onto the end cap 22, meaning that the protective component 25 and the electrode assembly 23 do not interfere with each other. The space enclosed by the protective component 25 can be greater than or equal to the cross-sectional area of ​​the electrode assembly 23 on a plane parallel to the end cap body 221, thereby reducing the risk that the protective component 25 may damage the electrode assembly 23.

[0242] Since at least a portion of the protective member 25 is located between the electrode assembly 23 and the end cap 22, and the projection of the protective member 25 onto the end cap 22 surrounds the projection of the electrode assembly 23 onto the end cap 22, thus, when the main body of the electrode assembly 23 is a cylindrical structure and the tab is a circular sheet structure, at least a portion of the protective member 25 can surround the tab. When the main body of the electrode assembly 23 is a cuboid structure and the tab is a strip structure, at least a portion of the protective member 25 can also surround the tab.

[0243] In this embodiment, a protective member 25 is provided and surrounds the electrode assembly 23 to reduce the risk of short circuit between the tab and the housing 21, and at the same time reduce the risk of electrolyte leakage; the projection of the protective member 25 is offset from the projection of the electrode assembly 23 to reduce the risk of the protective member 25 damaging the tab or the electrode assembly 23, and further improve the stability of the battery device 100.

[0244] Thirdly, some embodiments of this application also provide a battery device 100, including a battery cell 20 provided in some embodiments of the first aspect, or a battery cell 20 provided in some embodiments of the second aspect.

[0245] In this battery device 100, the tabs of the battery cell 20 are less likely to be damaged by the end cap 22, and the tabs are less likely to be short-circuited with the casing 21, thus making the battery cell 20 more stable.

[0246] Fourthly, some embodiments of this application also provide an electrical device, including a battery cell 20 provided in some embodiments of the first aspect, or a battery cell 20 provided in some embodiments of the second aspect, or a battery device 100 provided in some embodiments of the third aspect.

[0247] In this electrical device, the tabs of the battery cell 20 are less likely to be damaged by the end cap 22, and the tabs are less likely to be short-circuited with the casing 21. The battery cell 20 is more stable, and the battery device 100 is also more stable.

[0248] 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 in that, include: A housing having a receiving cavity open at at least one end; The electrode assembly is housed within the receiving cavity; An end cap, comprising an end cap body, the end cap body being connected to the housing and covering the opening of the receiving cavity, the end cap body having a protrusion on one side facing the receiving cavity, the protrusion being spaced apart from the electrode assembly, and the end cap having a flange protruding on the peripheral side of the surface facing the receiving cavity. In the direction perpendicular to the end cap body, the height of the flange is less than or equal to the height of the boss.

2. The battery cell according to claim 1, characterized in that, The flange includes a first part and a second part connected to the first part. The first part corresponds to the position of the boss, and the second part is offset from the boss. In the direction perpendicular to the end cap body, the size of the second part is smaller than the size of the first part.

3. The battery cell according to claim 1 or 2, characterized in that, In the direction perpendicular to the end cap body, the height of the flange is less than or equal to 2 mm.

4. The battery cell according to claim 1 or 2, characterized in that, In the direction perpendicular to the end cap body, the height of the flange ranges from 0.4 mm to 1 mm.

5. The battery cell according to any one of claims 1-4, characterized in that, The battery cell also includes a protective member housed within the receiving cavity, at least a portion of which is disposed between the end cap and the electrode assembly; The projection of the protective member onto the end cap surrounds the projection of the electrode assembly onto the end cap, and the projection of the protective member onto the end cap is offset from the projection of the electrode assembly onto the end cap.

6. The battery cell according to claim 5, characterized in that, The protective component is connected to the end cap.

7. The battery cell according to claim 6, characterized in that, The electrode assembly has a first end facing the end cap, and the end of the protective member facing away from the end cap is flush with the first end.

8. The battery cell according to claim 6, characterized in that, The electrode assembly has a first end facing the end cap, and the protective member has an end facing away from the end cap that extends beyond the plane of the first end.

9. The battery cell according to claim 8, characterized in that, The distance between the end of the protective component facing away from the end cap and the plane where the first end is located is in the range of 2mm to 3mm.

10. The battery cell according to any one of claims 6-9, characterized in that, The protective component is connected to the side of the boss or the flange, and the distance between the protective component and the end cap body is less than the height of the boss.

11. The battery cell according to claim 10, characterized in that, In the direction perpendicular to the end cap body, the size range of the connection between the protective member and the boss or the flange is 0.1mm to 0.5mm.

12. The battery cell according to claim 10 or 11, characterized in that, The distance between the protective component and the end cap body is in the range of 0.2mm to 0.5mm.

13. The battery cell according to any one of claims 6-12, characterized in that, The thickness of the protective component ranges from 40μm to 70μm.

14. The battery cell according to any one of claims 6-13, characterized in that, The protective component is made of at least plastic, and it is connected to the end cap by a hot-melt process.

15. The battery cell according to any one of claims 5-14, characterized in that, The electrode assembly includes a cathode tab, which is disposed adjacent to the end cap.

16. The battery cell according to any one of claims 6-14, characterized in that, The electrode assembly includes an anode lug disposed adjacent to the end cap.

17. The battery cell according to any one of claims 1-16, characterized in that, The battery cell has a cylindrical structure.

18. A single battery cell, characterized in that, include: A housing having a receiving cavity open at at least one end; The electrode assembly is housed within the receiving cavity; An end cap, the end cap including an end cap body, the end cap body being connected to the housing and covering the opening of the receiving cavity, the end cap body having a protrusion on one side facing the receiving cavity; A protective component is attached to the side of the boss, and at least a portion of the protective component is disposed between the end cap and the electrode assembly; The projection of the protective member onto the end cap surrounds the projection of the electrode assembly onto the end cap, and the projection of the protective member onto the end cap is offset from the projection of the electrode assembly onto the end cap.

19. A battery device, characterized in that, Includes the battery cell as described in any one of claims 1-17, or the battery cell as described in claim 18.

20. An electrical appliance, characterized in that, It includes the battery cell as described in any one of claims 1-17, or the battery cell as described in claim 18, or the battery device as described in claim 19.

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