Battery cell, battery device, and electric device

Abstract

The utility model relates to a battery monomer, a battery device and a power utilization device. The battery monomer comprises a shell, an end cover and a protective film, the shell is provided with a first opening; the end cover covers the first opening and comprises an end cover body and a convex part; the convex part is convexly arranged on the end cover body along one side deviating from the shell; the protective film at least partially surrounds the joint of the end cover and the shell; the protective film comprises a first protective part and a second protective part; the first protection part is arranged on one side, deviating from the interior of the battery monomer, of the end cover body; the second protection part is arranged on one side, deviating from the interior of the battery monomer, of the convex part; the maximum size d1 of the first protection part is larger than the maximum size d2 of the second protection part in the direction from the periphery of the end cover to the inner side of the end cover. When the battery monomer is prepared, the protective film with the same width can be directly attached to the upper part of the end cover, so that the process difficulty of attaching the protective film to the end cover is reduced, and the preparation process of the battery monomer is more time-saving.

Description

Technical Field

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

[0002] With the development of new energy technologies, batteries are being used more and more widely, for example in mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and power tools. A battery device usually contains multiple sets of battery cells. When a battery device has multiple sets of battery cells, adjacent battery cells need to be insulated to prevent scratches or short circuits between them. In related technologies, this is often achieved by attaching an insulating protective film to the outer wall of the battery cell casing, surrounding the connection between the casing and the end cap. However, for battery cells with inconsistent end cap heights, the process of attaching the insulating protective film is cumbersome and time-consuming, thus lengthening the overall manufacturing time of the battery cell. Utility Model Content

[0003] In view of the above problems, this application provides a battery cell, a battery device, and an electrical device, which can reduce the process difficulty of attaching an insulating protective film to the battery cell, thereby shortening the preparation time of the battery cell.

[0004] In a first aspect, this application provides a battery cell, which includes a housing, an end cap, and a protective film. The housing has a first opening; the end cap covers the first opening and includes an end cap body and a protrusion extending from the end cap body along a side away from the housing; the protective film at least partially surrounds the connection between the end cap and the housing; the protective film includes a first protective portion and a second protective portion; the first protective portion is disposed on the side of the end cap body away from the interior of the battery cell; the second protective portion is disposed on the side of the protrusion away from the interior of the battery cell; wherein, along the direction from the outer periphery of the end cap toward the inner side of the end cap, the maximum dimension d1 of the first protective portion is greater than the maximum dimension d2 of the second protective portion.

[0005] Since the end cap of the battery cell provided in this application embodiment includes an end cap body and a protrusion on the end cap body facing away from the housing, the entire end cap includes areas of different heights. When the protective film is at least partially surrounded at the connection between the end cap and the housing and disposed above the end cap, the maximum size d1 of the first protective part disposed on the side of the end cap body facing away from the inside of the battery cell along the direction from the outer periphery of the end cap towards the inner side of the end cap can be processed to be smaller than the maximum size d2 of the second protective part disposed on the side of the protrusion facing away from the inside of the battery cell. That is, the width d1 of the protective film at the higher protrusion is smaller than the width d2 of the protective film at the lower end cap body. This allows for the use of a protective film of uniform width for direct attachment when the protective film is attached to the end cap, reducing the steps of adjusting the protective film in the height variation area of ​​the end cap, thereby reducing the process difficulty of attaching the protective film to the end cap and making the battery cell manufacturing process more time-saving.

[0006] In some embodiments, the protective film further includes a film body connected to the first protective portion and the second protective portion; the film body is disposed on the outer peripheral wall of the housing, and the outer peripheral wall surrounds the first opening.

[0007] Through the combined action of the first protective part, the second protective part, and the membrane body, the protective membrane can not only protect the end cap, but also the outer peripheral wall of the casing, thereby effectively protecting the outer surface of the entire battery cell. This results in better insulation protection between adjacent battery cells, and ultimately, a safer battery device.

[0008] In some embodiments, the end cap body and the protrusion are arranged along a first direction; the first protective portion at any position has a dimension d along a second direction. 11 , equal to the size d of the second protective part at any position 21 And the sum of the protrusion height h1 of the protrusion at that location relative to the protrusion height h1 of the end cap body: the second direction is perpendicular to the first direction, and the second direction is parallel to the plane on which the end cap body is located.

[0009] By defining the dimension d of the first protective part along the second direction at any location. 11 , equal to the size d of the second protective part at any position 21 The sum of the protrusion height h1 at that location relative to the protrusion height h1 of the end cap body allows for the use of a protective film of the same size to be applied to the outer periphery of the entire casing and the top of the end cap when the end cap has a protrusion or the height of the protrusions at different locations is inconsistent. This reduces the need to replace protective films of different sizes, lowers the difficulty of applying the protective film to the battery cell, and makes the battery cell manufacturing process more time-saving.

[0010] In some embodiments, the end cap further includes a transition portion that connects the end cap body to the protrusion.

[0011] By providing a transition section between the end cap body and the protrusion, the height of the two can transition from the lower end cap body to the higher protrusion through the transition section, thereby facilitating the processing and fabrication of the protrusion.

[0012] In some embodiments, the transition portion includes a transition body and a first transition region, the first transition region being connected between the end cap body and the transition body.

[0013] The transition connection between the transition body and the end cap body is achieved by connecting the first transition zone to the transition body and the end cap body respectively.

[0014] In some embodiments, the first transition region has a first transition fillet.

[0015] By setting a first transition fillet in the first transition zone, the transition deformation can be carried out through the first transition fillet during the processing of the transition part. This not only makes it easier to process, but also results in a more balanced stress distribution compared to the right-angle processing method without a transition fillet, making it less prone to failure at the bending point.

[0016] In some embodiments, the transition portion further includes a second transition region connecting the protrusion and the transition body.

[0017] The transition connection between the transition body and the protrusion is achieved by connecting the second transition zone to the transition body and the protrusion respectively.

[0018] In some embodiments, the second transition region has a second transition fillet.

[0019] By setting a second transition fillet in the second transition zone, the transition deformation can be carried out through the second transition fillet during the processing of the transition part. This not only makes it easier to process, but also results in a more balanced stress distribution compared to the right-angle processing method without a transition fillet, making it less prone to failure at the bending point.

[0020] In some embodiments, the protective film further includes a third protective portion; the third protective portion is connected between the first protective portion and the second protective portion; the third protective portion is disposed on the side of the transition portion opposite to the first opening.

[0021] By providing a third protective section on the side of the transition section away from the first opening, insulation protection can also be provided to the transition section, thereby improving the insulation protection effect of the entire battery cell.

[0022] In some embodiments, the third protective portion includes an inner side edge near the inside of the first opening, the inner side edge extending obliquely from the end cap body toward the protrusion side.

[0023] By extending the side of the third protective part closer to the inner side of the first opening at an angle from the end cap body toward the protrusion, it is possible to select a protective film connected to the first and second protective parts for application when insulating the transition part through the third protective part, thus facilitating the application process of the protective film.

[0024] In some embodiments, the maximum dimensions d3 of the third protective part, d1 of the first protective part, and d2 of the second protective part satisfy the condition d2<d3≤d1 in the direction from the outer periphery of the first opening toward the inner side of the first opening.

[0025] Because the end cap body is lower than the height of the first opening, the maximum dimension d1 of the first protective part is larger. Because the protrusion is higher than the height of the first opening, the maximum dimension d2 of the second protective part is smaller. Since the third protective part is attached to the transition part, its height relative to the first opening is between the end cap body and the protrusion; therefore, the maximum dimension d3 of the third protective part is greater than the maximum dimension d2 of the second protective part, and less than or equal to the maximum dimension d1 of the first protective part.

[0026] In some embodiments, the size of the third protective portion gradually decreases from the side of the first protective portion toward the inside of the first opening along the outer periphery of the first opening.

[0027] By gradually reducing the size of the third protective part from the side of the first protective part toward the inner side of the first opening along the outer periphery of the first opening, it is possible to select a protective film connected to the first and second protective parts for application when insulating the transition part through the third protective part, thus facilitating the application process of the protective film.

[0028] In some embodiments, there is a gap between the third protective portion and the transition portion.

[0029] Since the third protective part is connected to the first and second protective parts, and the first transition area has a first transition fillet and the second transition area has a second transition fillet, when the third protective part is attached to the transition part, in order to make the attachment of the first protective part, the second protective part, the third protective part and the membrane body relatively flat, a gap will be formed between the third protective part and the transition part. This allows for a smooth transition and suspension when attaching the first protective part, the second protective part and the third protective part, making the processing steps simple and convenient.

[0030] In some embodiments, the third protective portion is fitted together with the transition portion.

[0031] By ensuring that the third protective part and the transition part fit together, the insulation protection effect of the third protective part on the transition part is guaranteed, and foreign objects can be effectively prevented from falling between the third protective part and the transition part.

[0032] In some embodiments, the protective film is constructed with gaps.

[0033] By reducing the amount of protective film attached at the notch, the third protective part can be attached to the transition part.

[0034] In some embodiments, the notch is configured with a second opening; the second opening is opened toward the inside side of the first opening.

[0035] By constructing a second opening on the notch and opening the second opening towards the inside of the first opening, that is, opening it away from the membrane body, it is easier to form the notch. Compared with setting the second opening on the side closer to the membrane body, the preparation process is simpler and can effectively avoid damage to the membrane body.

[0036] In some embodiments, the notch includes two sides connected to each other; the two sides extend from the outer periphery of the first opening toward the inner side of the first opening; the two sides together enclose a second opening.

[0037] The second opening is formed by two sides extending from the outer periphery of the first opening toward the inner side of the first opening, which makes the processing of the second opening more convenient.

[0038] In some embodiments, the notch includes a first side and a second side arranged symmetrically.

[0039] By setting the gap as a symmetrical first side and a second side, the tension exerted by the protective membrane on the two sides after the formation of the first side and the second side is more balanced, thereby preventing the gap from expanding further and extending to the second transition membrane.

[0040] In some embodiments, the protective film further includes a supplementary sub-film; the supplementary sub-film is disposed on the side of the notch opposite to the end cap.

[0041] By setting a supplementary membrane on the side of the notch away from the end cap, the end cap at the notch is insulated and protected by the supplementary membrane, thereby improving the insulation protection effect for the entire battery cell.

[0042] In some embodiments, the supplementary membrane includes a shielding portion and a connecting portion. The shielding portion is adhered above the notch and surrounds the outer periphery of the notch; the connecting portion is connected to the shielding portion and adhered to the outer peripheral wall of the housing.

[0043] The shielding portion surrounds the outer periphery of the notch, meaning it completely covers the notch, thus effectively protecting the end cap below the notch. The connecting portion is used to better secure the shielding portion to the housing.

[0044] In some embodiments, the notch is provided in the third protective section.

[0045] By placing the notch on the third protective section where the height changes, the flatness of the protective film can be easily adjusted at this point, resulting in better adhesion of the protective film.

[0046] In some embodiments, the notch is located above the transition body.

[0047] Because the slope of the transition body is relatively even, it is easy to cut when the notch is located above the transition body. After cutting, the two sides of the notch can be more evenly bonded to the transition body.

[0048] In some embodiments, the notch is provided on the first protective portion.

[0049] Because the first protective part is larger in size, when the notch is set on the first protective part, the operator has more processing space when the notch is formed by shearing, and it is less likely to be interfered with by other structures.

[0050] In some embodiments, the transition portion includes a transition body and a first transition region. The first transition region connects the end cap body and the transition body; the distance d4 between the notch and the first transition region satisfies the condition: d4 < 5 mm.

[0051] By setting the distance d4 between the notch and the first transition zone to less than 5mm, the distance between the notch and the first transition zone is made too small. This effectively reduces the stress of the protective film in the first transition zone by utilizing the stress release at the notch, and also facilitates the adjustment of the flatness of the bonding in the first transition zone.

[0052] In some embodiments, the notch is provided on the second protective portion.

[0053] Because the second protective part is larger in size, when the notch is set on the second protective part, the operator has more processing space when the notch is formed by shearing, and it is less likely to be interfered with by other structures.

[0054] In some embodiments, the transition portion includes a transition body and a second transition region. The second transition region connects the protrusion and the transition body; the distance d5 between the notch and the second transition region satisfies the condition: d5 < 5 mm.

[0055] By setting the distance d5 between the notch and the second transition zone to less than 5mm, the distance between the notch and the second transition zone is made too small. This effectively reduces the stress of the protective film in the second transition zone by utilizing the stress release at the notch, and also facilitates the adjustment of the adhesion flatness in the second transition zone.

[0056] In some embodiments, the battery cell also includes terminals disposed on the protrusion. By projecting the terminals onto the protrusion, the terminals do not affect the capacity of the cell assembly, thereby increasing the cell capacity. At the same time, more space is provided for the terminals, preventing interference between the protective film and the terminals, and enhancing safety.

[0057] Secondly, this application provides a battery device, which includes a housing and the battery cells in the above embodiments; the housing is constructed with a receiving space; the battery cells are housed within the receiving space.

[0058] When the battery device provided in this application embodiment is used, since the end cap of the battery cell inside the casing includes an end cap body and a protrusion on the end cap body facing away from the housing, the entire end cap includes areas of different heights. When a protective film is placed around the connection between the end cap and the housing and positioned above the end cap, the maximum dimension d1 of the first protective portion on the end cap body can be processed to be smaller than the maximum dimension d2 of the second protective portion on the protrusion along the direction from the outer periphery of the end cap towards the inner side of the end cap. That is, the width d1 of the protective film at the higher protrusion is smaller than the width d2 of the protective film at the lower end cap body. This allows for the use of a protective film of uniform width for direct application when attaching the protective film to the end cap, reducing the need for adjustments to the protective film in the height variation area of ​​the end cap. This reduces the difficulty of attaching the protective film to the end cap and makes the battery cell manufacturing process more time-saving. Consequently, the battery device manufacturing speed is faster, and production efficiency is effectively improved.

[0059] In some embodiments, the protrusion is bonded to the housing. By bonding the protrusion to the housing, the bonding area between the protrusion and the housing is increased, resulting in greater connection stability when the battery cell is housed within the housing space.

[0060] Thirdly, this application provides an electrical device that includes the battery device in the above embodiments, wherein the battery is used to provide electrical energy.

[0061] When the electrical device provided in this application embodiment is used, the battery device composed of the battery cells provided in this application embodiment provides electrical energy to the electrical device. Since the end cap of the battery cell includes an end cap body and a protrusion on the end cap body facing away from the housing, the entire end cap includes areas of different heights. When the protective film is placed around the connection between the end cap and the housing and placed above the end cap, the maximum size d1 of the first protective part on the end cap body can be processed to be smaller than the maximum size d2 of the second protective part on the protrusion along the direction from the outer periphery of the end cap towards the inner side of the end cap. That is, the width d1 of the protective film at the higher protrusion is smaller than the width d2 of the protective film at the lower end cap body. This allows for the use of a protective film of uniform width for direct application when attaching the protective film to the end cap, reducing the process of adjusting the protective film in the height variation area of ​​the end cap. This reduces the difficulty of attaching the protective film to the end cap, making the battery cell manufacturing process more time-saving, and thus making the manufacturing speed of the electrical device faster and effectively improving production efficiency.

[0062] 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, the following are specific embodiments of this application. Attached Figure Description

[0063] 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:

[0064] Figure 1 The electrical device provided in some embodiments of this application is a structural schematic diagram of a vehicle.

[0065] Figure 2 This is an exploded structural diagram of a battery device provided in some embodiments of this application.

[0066] Figure 3 This is an exploded structural diagram of a battery cell provided in some embodiments of this application.

[0067] Figure 4 for Figure 3 A schematic diagram of a single battery cell is shown.

[0068] Figure 5 for Figure 4 A magnified view of a portion at point A shown.

[0069] Figure 6 for Figure 4 The front view of the battery cell shown.

[0070] Figure 7 for Figure 4 The top view of the battery cell shown.

[0071] Figure 8 for Figure 7 A magnified view of point B shown.

[0072] Figure 9 for Figure 7 The stepped sectional view at CC shown.

[0073] Figure 10 for Figure 9 The enlarged view of point D shown.

[0074] Figure 11 This is a schematic diagram of a battery cell provided for other embodiments of this application.

[0075] Figure 12 for Figure 11 A magnified view of a portion at point E shown.

[0076] Figure 13 for Figure 11 The front view of the battery cell shown.

[0077] Figure 14 for Figure 11 The diagram shown illustrates a single battery cell with the supplementary membrane removed.

[0078] Figure 15 This is a magnified view of point F shown in Figure 14.

[0079] Figure 16 This is a partially enlarged view of a battery cell with the supplementary membrane removed, provided in some other embodiments of this application.

[0080] Figure 17 Some embodiments of this application provide partial enlarged views of a battery cell with the supplementary membrane removed.

[0081] The reference numerals in the detailed embodiments are as follows:

[0082] 10000 - Vehicles;

[0083] 1000-battery unit;

[0084] 1100-cell battery;

[0085] 100 - Shell; 110 - First opening; 120 - Outer peripheral wall;

[0086] 200 - End cap; 210 - End cap body; 220 - Protrusion; 221 - Electrode terminal; 230 - Transition portion; 231 - Transition body; 232 - First transition region; 2321 - First transition fillet; 233 - Second transition region; 2331 - Second transition fillet;

[0087] 300 - Protective film; 311 - First protective part; 312 - Second protective part; 313 - Third protective part; 3131 - Inner side; 314 - Notch; 3141 - Second opening; 3142 - First side; 3143 - Second side; 320 - Membrane body; 330 - Gap; 340 - Supplementary membrane; 341 - Shielding part; 342 - Connecting part;

[0088] 400-cell;

[0089] 1200 - Box body; 1210 - Storage space; 1220 - First section; 1230 - Second section;

[0090] 2000-Controller;

[0091] 3000-motor. Detailed Implementation

[0092] 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.

[0093] 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.

[0094] 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.

[0095] 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.

[0096] 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.

[0097] 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).

[0098] 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.

[0099] 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.

[0100] Currently, judging from market trends, the application of power batteries is becoming increasingly widespread. Power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively used 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 power battery applications, market demand is also constantly increasing.

[0101] In a battery device that constitutes a power battery, there are usually multiple sets of battery cells. When a battery device has multiple sets of battery cells, insulation protection measures are required between adjacent battery cells to prevent scratches or short circuits between them. In related technologies, this is mostly achieved by attaching an insulating protective film to the outer peripheral wall of the battery cell casing, with the insulating protective film surrounding the connection between the battery cell casing and the end cap.

[0102] In the fabrication of some battery cells, a protrusion is created on the end cap of the cell to increase the capacity of the cell assembly. Connecting components such as terminals and tabs are placed within this protrusion, thereby increasing the cell capacity. However, this method results in areas with varying end cap heights. For battery cells with inconsistent end cap heights, the application of the insulating protective film is more complex and time-consuming, thus extending the overall fabrication time of the battery cell.

[0103] Based on the above considerations, and to address the issues of high process difficulty and long manufacturing time associated with attaching insulating protective films to battery cells, this application provides a battery cell where, when the end cap of the battery cell includes regions of varying heights, the protective film is set to different sizes for these regions. This allows for the use of protective films with a consistent width for attachment, reducing the need for adjustments to the protective film in areas of varying end cap heights. Consequently, the process difficulty of attaching the protective film to the end cap is reduced, making the battery cell manufacturing process more time-efficient.

[0104] The power batteries manufactured using the battery cells disclosed in the embodiments of this application can be used, but are not limited to, in electrical devices such as vehicles, ships, or aircraft. Specifically, the electrical devices can be, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Among them, electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0105] For ease of explanation, the following embodiments will be described using a vehicle as an example of an electrical device according to an embodiment of this application.

[0106] Please refer to Figure 1 , Figure 1The diagram illustrates the structure of a vehicle 10000 according to some embodiments of this application. The vehicle 10000 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 10000, and the battery can be located at the bottom, front, or rear of the vehicle 10000. The battery can be used to power the vehicle 10000; for example, the battery can serve as the operating power source for the vehicle 10000. The vehicle 10000 may also include a controller 2000 and a motor 3000. The controller 2000 controls the battery to supply power to the motor 3000, for example, to meet the power needs of the vehicle 10000 during startup, navigation, and driving.

[0107] In some embodiments of this application, the battery can not only serve as the operating power source for the vehicle 10000, but also as the driving power source for the vehicle 10000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 10000.

[0108] Please refer to Figure 2 , Figure 2 It shows Figure 1 The diagram shows an exploded view of the battery. The battery includes a housing 1200 and individual battery cells 1100, with the individual battery cells 1100 housed within the housing 1200. The housing 1200 provides a receiving space 1210 for the individual battery cells 1100, and the housing 1200 can have various structures. In some embodiments, the housing 1200 may include a first portion 1220 and a second portion 1230, which overlap each other, and together define the receiving space 1210 for accommodating the individual battery cells 1100. The second part 1230 can be a hollow structure with a first opening 110 at one end, and the first part 1220 can be a plate-like structure. The first part 1220 covers the first opening 110 side of the second part 1230, so that the first part 1220 and the second part 1230 together define the receiving space 1210. Alternatively, the first part 1220 and the second part 1230 can both be hollow structures with a first opening 110 on one side, with the first opening 110 side of the first part 1220 covering the first opening 110 side of the second part 1230. Of course, the box 1200 formed by the first part 1220 and the second part 1230 can be of various shapes, such as a cylinder, a cuboid, etc.

[0109] In a battery, there can be multiple battery cells 1100, which can be connected in series, parallel, or a combination thereof. A combination thereof means that multiple battery cells 1100 are connected in both series and parallel. Multiple battery cells 1100 can be directly connected in series, parallel, or a combination thereof, and then the entire assembly of the multiple battery cells 1100 is housed within a casing 1200. Alternatively, the battery can be composed of multiple battery cells 1100 first connected in series, parallel, or a combination thereof to form a battery module, and then multiple battery modules are connected in series, parallel, or a combination thereof to form a whole, which is also housed within the casing 1200. The battery may also include other structures; for example, the battery may include a busbar component for electrical connection between the multiple battery cells 1100.

[0110] Each battery cell 1100 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. The battery cell 1100 can be cylindrical, flat, cuboid, or other shapes.

[0111] Please see Figure 3 , Figure 3 It shows Figure 2 The image shows an exploded view of battery cell 1100. Battery cell 1100 refers to the smallest unit that makes up a battery. Figure 3 The battery cell 1100 includes a housing 100, an end cap 200, a protective film 300, a battery cell 400, and other functional components. The housing 100 has a first opening 110; the end cap 200 covers the first opening 110 and includes an end cap body 210 and a protrusion 220; the protrusion 220 protrudes from the end cap body 210 along the side away from the housing 100; the protective film 300 at least partially surrounds the connection between the end cap 200 and the housing 100; the protective film 300 includes a first protective portion 311 and a second protective portion 312; the first protective portion 311 is disposed on the side of the end cap body 210 away from the interior of the battery cell 1100; the second protective portion 312 is disposed on the side of the protrusion 220 away from the interior of the battery cell 1100; wherein, along the direction from the outer periphery of the end cap 200 toward the inner side of the end cap 200, the maximum dimension d1 of the first protective portion 311 is greater than the maximum dimension d2 of the second protective portion 312. Specifically, the direction from the outer periphery of the end cap 200 to the inner side of the end cap 200 is the direction from the outer circumference of the end cap 200 towards its interior. For example... Figure 5 The first protective part 311 shown here is in the y-direction of the diagram.

[0112] End cap 200 refers to a component that covers the first opening 110 of housing 100 to isolate the internal environment of battery cell 1100 from the external environment. The shape of end cap 200 can be adapted to the shape of housing 100 to fit it. Optionally, end cap 200 can be made of a material with certain hardness and strength (such as aluminum alloy), so that end cap 200 is less prone to deformation under pressure and impact, enabling battery cell 1100 to have higher structural strength and improved safety performance. Functional components such as electrode terminals 221 can be provided on end cap 200. Electrode terminals 221 can be used for electrical connection with battery cell 400 to output or input electrical energy to battery cell 1100. In some embodiments, end cap 200 may also be provided with a pressure relief mechanism for releasing internal pressure when the internal pressure or temperature of battery cell 1100 reaches a threshold. The end cap 200 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose any special limitations on this. In some embodiments, an insulating structure may be provided on the inner side of the end cap 200. The insulating structure can be used to isolate the electrical connection parts 342 in the housing 100 from the end cap 200 to reduce the risk of short circuit. For example, the insulating structure can be plastic, rubber, etc.

[0113] The housing 100 is an assembly used to cooperate with the end cap 200 to form the internal environment of the battery cell 1100, wherein the formed internal environment can accommodate the battery cell 400, electrolyte, and other components. The housing 100 and the end cap 200 can be independent components. A first opening 110 can be provided on the housing 100, and the end cap 200 closes the first opening 110 to form the internal environment of the battery cell 1100. Alternatively, the end cap 200 and the housing 100 can be integrated. Specifically, the end cap 200 and the housing 100 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 100, the end cap 200 closes the housing 100. The housing 100 can have various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing 100 can be determined according to the specific shape and size of the battery cell 400. The shell 100 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. This application embodiment does not impose any special restrictions on this.

[0114] The battery cell 400 is the component in the battery cell 1100 where the electrochemical reaction occurs. The casing 100 may contain one or more battery cells 400. The battery cell 400 is mainly formed by thermally bonding a positive electrode sheet, a negative electrode sheet, and a separator disposed between the positive and negative electrode sheets to form a composite strip, and then stacking the composite strip. The portions of the positive and negative electrode sheets containing active material constitute the main body of the battery cell 400, while the portions of the positive and negative electrode sheets without active material each constitute a tab. The positive and negative tabs may be located together at one end of the main body or separately at both ends of the main body. 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 221 to form a current circuit.

[0115] The protective film 300 is an insulating protective film, also known as blue film or aluminum-plastic film. It provides a layer of physical protection for the battery cell 1100, while also enhancing sealing performance to prevent gas generated inside the battery cell 1100 from leaking into the external environment, maintaining stable internal pressure. It also prevents oxygen and moisture from the outside air from entering the battery. Furthermore, it has certain heat insulation properties and electrical insulation protection, thus isolating heat transfer between the inside of the battery cell 1100 and the external environment to a certain extent, helping to maintain the battery's operating temperature. It also effectively prevents direct contact between the positive and negative terminals of the battery, avoiding short circuits, improving battery safety, and reducing the risk of electrical failures.

[0116] Since the end cap 200 of the battery cell 1100 provided in this application embodiment includes an end cap body 210 and a protrusion 220 protruding from the end cap body 210 on the side opposite to the housing 100, the entire end cap 200 includes areas of different heights. When the protective film 300 is at least partially surrounding the connection between the end cap 200 and the housing 100, the maximum size d1 of the first protective part 311 located on the side of the end cap body 210 away from the inside of the battery cell 1100 along the outer periphery of the end cap 200 toward the inner side of the end cap 200 can be processed to be smaller than the maximum size d2 of the second protective part 312 located on the side of the protrusion 220 away from the inside of the battery cell 1100. That is, the width d1 of the protective film 300 at the higher protrusion 220 is smaller than the width d2 of the protective film 300 at the lower end cap body 210. This allows for the use of a protective film 300 with a consistent width for direct application when attaching the protective film 300 to the end cap 200, reducing the need for adjustments to the protective film 300 in areas of varying height of the end cap 200. This reduces the difficulty of attaching the protective film 300 to the end cap 200 and makes the manufacturing process of the battery cell 1100 more time-efficient.

[0117] Meanwhile, since the maximum size d1 of the first protective part 311 located on the side of the end cover body 210 away from the inside of the battery cell 1100 is relatively large, the attachment area of ​​the protective film 300 in the non-protruding part 220 area of ​​the end cover 200, that is, the end cover body 210 area, is relatively large, and the insulation protection effect is better.

[0118] This application uses a protective film 300 of uniform width to directly attach the end cap 200 of the battery cell 1100, thereby enabling the use of an annular coating process to attach the protective film 300 to the battery cell 1100 during the manufacturing process of the battery cell 1100, which makes the process very simple and time-saving.

[0119] The following is a detailed description of the structure of the 1100 battery cell. Please refer to [link / reference]. Figures 4-17 , Figure 4 It shows Figure 3 A schematic diagram of the battery cell 1100 is shown. Figure 5 It shows Figure 4 A magnified view of a portion at point A shown. Figure 6 It shows Figure 4 The front view of the battery cell 1100 shown. Figure 7 It shows Figure 4 The top view of the battery cell 1100 shown. Figure 8 It shows Figure 7 A magnified view of point B shown. Figure 9 It shows Figure 7 The stepped sectional view at CC shown. Figure 10 It shows Figure 9 The enlarged view of point D shown. Figure 11 A schematic diagram of a battery cell 1100 provided in other embodiments of this application is shown. Figure 12 It shows Figure 11 A magnified view of a portion at point E shown. Figure 13 It shows Figure 11 The front view of the battery cell 1100 shown. Figure 14 It shows Figure 11 The diagram shown is a schematic of a single battery cell 1100 without the supplementary membrane 340. Figure 15 A magnified view of point F shown in Figure 14 is presented. Figure 16 A partially enlarged view of a battery cell 1100 provided in other embodiments of this application with the supplementary membrane 340 removed is shown. Figure 17 A partially enlarged view of the battery cell 1100 provided in some embodiments of this application without the supplementary membrane 340 is shown.

[0120] Please see Figures 3-6 , Figures 11-17In some embodiments, the protective film 300 further includes a film body 320, which is connected to the first protective part 311 and the second protective part 312; the film body 320 is disposed on the outer peripheral wall 120 of the housing 100, and the outer peripheral wall 120 surrounds the first opening 110.

[0121] The outer peripheral wall of the shell 100 is the side wall of the shell 100 that surrounds the first opening 110.

[0122] The first protective part 311, the second protective part 312, and the membrane body 320 are designations for different locations within a single protective membrane 300. The first protective part 311 and the second protective part 312 are located at the connection between the end cap 200 and the housing 100 and are positioned above the end cap 200 to provide insulation protection for the end cap 200. The membrane body 320 is located on the outer peripheral wall 120 of the housing 100, thereby providing insulation protection for the outer peripheral wall 120 of the housing 100.

[0123] Through the combined action of the first protective part 311, the second protective part 312, and the membrane body 320, the protective film 300 can not only protect the end cap 200, but also protect the outer peripheral wall 120 of the housing 100, thereby effectively protecting the outer surface of the entire battery cell 1100. This results in better insulation protection between adjacent battery cells 1100, and ultimately, a safer battery device 1000.

[0124] Please see Figure 5 , Figure 12 as well as Figures 15-17 In some embodiments, the end cap body 210 and the protrusion 220 are arranged along a first direction; specifically, the first direction is... Figure 5 , Figure 12 as well as Figures 15-17 The dimension d of the first protective part 311 at any position along the second direction in the xx' direction. 11 The second protective part 312 at any position is equal to the dimension d along the second direction. 21 and the sum of the protrusion height h1 of the protrusion 220 at that location relative to the protrusion height h1 of the end cap body 210; the second direction is perpendicular to the first direction and parallel to the plane containing the end cap body 210; specifically, the second direction is Figure 5 , Figure 12 as well as Figures 15-17 The yy' direction in the middle.

[0125] When the height of the protrusion 220 on the end cap 200 is consistent at all positions, the dimension d of the second protective part 312 at any position is . 21It is equal to the maximum size d2 of the second protective part 312, and the protrusion 220 at any position is also equal to the protrusion height h1 of the end cap body 210.

[0126] When the height of the protrusion 220 on the end cap 200 is inconsistent at different positions, the protrusion height h1 of the protrusion 220 at different positions is not equal to that of the end cap body 210. Therefore, the size d of the second protective part 312 at different positions is also different. 21 They are not equal either.

[0127] By defining the dimension d of the first protective part 311 at any location along the second direction. 11 The second protective part 312 at any position is equal to the dimension d along the second direction. 21 The sum of the protrusion height h1 of the protrusion 220 at this position relative to the protrusion height h1 of the end cap body 210 ensures that when the protective film 300 is attached to the top of the end cap 200, even if the end cap 200 has a protrusion 220 or the height of the protrusion 220 at different positions is inconsistent, the same size protective film 300 can still be used to attach to the outer peripheral wall 120 of the entire housing 100 and the top of the end cap 200. This reduces the process of replacing protective films 300 of different sizes, reduces the difficulty of attaching the protective film 300 to the battery cell 1100, and also makes the manufacturing process of the battery cell 1100 more time-saving.

[0128] It should be noted that, when considering the errors in the application process and the manufacturing errors in the protective film 300, the dimension d of the first protective part 311 at any position along the second direction is... 11 The dimension d of the second protective part 312 at any position along the second direction 21 Furthermore, the sum of the protrusion height h1 of the protrusion 220 at this location and that of the end cap body 210 is not necessarily exactly equal; it can have a certain tolerance. For example, the dimension d of the first protective portion 311 along the second direction at any location. 11 The dimension d of the second protective part 312 at any position along the second direction 21 The difference between the protrusion 220 at this location and the protrusion height h1 of the end cap body 210 is within ±3mm. That is, the dimension d of the first protective part 311 at any location along the second direction... 11 The size of the second protective part 312 along the second direction can be greater than the maximum size of the second protective part 312 at any position. 21 The sum of the protrusion height h1 of the protrusion 220 at this location and the protrusion height h1 of the end cap body 210 is 3 mm. It can also be at least smaller than the dimension d of the second protective portion 312 along the second direction at any location. 21 The sum of the protrusion height h1 of the protrusion 220 at this location and the protrusion height h1 of the end cap body 210 is 3mm.

[0129] Please see Figure 4 , Figure 5 , Figure 7 , Figure 8 , Figure 10 , Figure 11 , Figure 12 as well as Figures 14-17 In some embodiments, the end cap 200 further includes a transition portion 230 that connects the end cap body 210 and the protrusion 220.

[0130] The transition portion 230 can be integrally stamped with the end cap body 210 and the protrusion 220, thereby facilitating the processing and fabrication of the entire end cap 200.

[0131] By providing a transition portion 230 between the end cap body 210 and the protrusion 220, the height of the two can be transitioned from the lower end cap body 210 to the higher protrusion 220 through the transition portion 230, thereby facilitating the processing and fabrication of the protrusion 220.

[0132] Please see Figure 10 , Figure 12 as well as Figures 15-17 In some embodiments, the transition portion 230 includes a transition body 231 and a first transition region 232, the first transition region 232 being connected between the end cap body 210 and the transition body 231.

[0133] The first transition zone 232 can be a partially curved surface structure, which facilitates forming and demolding during stamping.

[0134] The first transition zone 232 is connected to the transition body 231 and the end cap body 210 respectively, thereby realizing the transition connection between the transition body 231 and the end cap body 210.

[0135] Please see Figure 10 In some embodiments, the first transition region 232 has a first transition fillet 2321.

[0136] Since the height of the end cap body 210 is relatively low and the height of the transition body 231 is relatively high, the center of the first transition fillet 2321 can be set above the side of the end cap body 210 away from the first opening 110, which facilitates processing.

[0137] By providing a first transition fillet 2321 in the first transition zone 232, the transition deformation can be carried out through the first transition fillet 2321 when processing the transition part 230. This not only makes it easier to process, but also results in a more balanced stress distribution compared to the right-angle processing method without a transition fillet, making it less prone to failure at the bending point.

[0138] Please see Figure 10 , Figure 12 as well as Figures 15-17 In some embodiments, the transition portion 230 further includes a second transition region 233, which is connected between the protrusion 220 and the transition body 231.

[0139] The second transition zone 233 can be a partially curved surface structure, which facilitates forming and demolding during stamping.

[0140] The transition connection between the transition body 231 and the protrusion 220 is achieved by connecting the second transition zone 233 to the transition body 231 and the protrusion 220 respectively.

[0141] Please see Figure 10 In some embodiments, the second transition region 233 has a second transition fillet 2331.

[0142] Since the height of the protrusion 220 is relatively low and the height of the transition body 231 is relatively high, the center of the first transition fillet 2321 can be set below the side of the protrusion 220 near the first opening 110, which facilitates processing.

[0143] By setting a second transition fillet 2331 in the second transition zone 233, the transition deformation can be carried out through the second transition fillet 2331 when the transition part 230 is processed. This not only makes it easier to process, but also results in a more balanced stress distribution compared to the right-angle processing method without a transition fillet, making it less prone to failure at the bending point.

[0144] Please see Figures 5-17 In some embodiments, the protective film 300 further includes a third protective portion 313; the third protective portion 313 is connected between the first protective portion 311 and the second protective portion 312; the third protective portion 313 is disposed on the side of the transition portion 230 opposite to the first opening 110.

[0145] The third protective part 313 is made of the same material as the first protective part 311 and the second protective part 312, which is an insulating protective film.

[0146] By providing a third protective part 313 on the side of the transition portion 230 away from the first opening 110, insulation protection can also be provided at the transition portion 230, thereby improving the insulation protection effect of the entire battery cell 1100.

[0147] Please see Figure 8 In some embodiments, the third protective portion 313 includes an inner side 3131 near the inside of the first opening 110, the inner side 3131 extending obliquely from the end cap body 210 toward the protrusion 220.

[0148] Since the height of the transition portion 230 gradually increases relative to the end cap body 210 in the direction from the end cap body 210 toward the protrusion 220, when the same protective film 300 is attached to the top of the end cap 200, the attachment width of the protective film 300 will inevitably decrease as the height of the transition portion 230 gradually increases when it transitions from the end cap body 210 to the protrusion 220. This causes the inner side 3131 of the third protective portion 313 near the inner side of the first opening 110 to extend obliquely from the end cap body 210 toward the protrusion 220.

[0149] By extending the inner side 3131 of the third protective part 313 close to the inner side of the first opening 110 from the end cap body 210 toward the protrusion 220, it is possible to select a protective film 300 connected to the first protective part 311 and the second protective part 312 for attachment when insulating the transition part 230 through the third protective part 313, thus facilitating the attachment process of the protective film 300.

[0150] Please see Figure 8 In some embodiments, the maximum dimensions d3 of the third protective part 313, the maximum dimensions d1 of the first protective part 311, and the maximum dimensions d2 of the second protective part 312 satisfy the condition: d2<d3≤d1, along the outer periphery of the first opening 110 toward the inner side of the first opening 110.

[0151] Because the end cap body 210 is lower than the first opening 110, the maximum dimension d1 of the first protective portion 311 is larger. Because the protrusion 220 is higher than the first opening 110, the maximum dimension d2 of the second protective portion 312 is smaller. Since the third protective portion 313 is attached to the transition portion 230, its height relative to the first opening 110 is between that of the end cap body 210 and the protrusion 220. Therefore, the maximum dimension d3 of the third protective portion 313 is greater than the maximum dimension d2 of the second protective portion 312, and less than or equal to the maximum dimension d1 of the first protective portion 311.

[0152] Please see Figure 8 In some embodiments, the size of the third protection portion 313 gradually decreases from the first protection portion 311 toward the inner side of the first opening 110 along the outer periphery of the first opening 110.

[0153] Since the height of the transition portion 230 gradually increases relative to the end cap body 210 in the direction from the end cap body 210 toward the protrusion 220, when the same protective film 300 is attached to the top of the end cap 200, the attachment width of the protective film 300 will inevitably decrease as the height of the transition portion 230 gradually increases when it transitions from the end cap body 210 to the protrusion 220. As a result, the dimension of the third protective portion 313 in the direction from the outer periphery of the first opening 110 toward the inner side of the first opening 110 gradually decreases from the side of the first protective portion 311 toward the third protective portion 313.

[0154] By gradually reducing the size of the third protective portion 313 along the outer periphery of the first opening 110 toward the inner side of the first opening 110 from the side of the first protective portion 311 toward the third protective portion 313, it is possible to select a protective film 300 connected to the first protective portion 311 and the second protective portion 312 for attachment when insulating the transition portion 230 through the third protective portion 313, thus facilitating the attachment process of the protective film 300.

[0155] Please see Figure 10 In some embodiments, a gap 330 is provided between the third protection portion 313 and the transition portion 230.

[0156] Since the third protective part 313 is connected to the first protective part 311 and the second protective part 312, and the first transition area 232 has a first transition fillet 2321 and the second transition area 233 has a second transition fillet 2331, when the third protective part 313 is attached to the transition part 230, in order to make the attachment of the first protective part 311, the second protective part 312, the third protective part 313 and the membrane body 320 relatively flat, a gap 330 will be formed between the third protective part 313 and the transition part 230. This allows for a smooth transition when attaching the first protective part 311, the second protective part 312 and the third protective part 313, making the processing steps simple and convenient.

[0157] Please see Figure 12 and combined Figures 15-17 In some embodiments, the third protective portion 313 is fitted with the transition portion 230.

[0158] An opening can be provided on the protective film 300 so that the third protective part 313 and the transition part 230 can fit together, thereby ensuring the insulation protection effect of the third protective part 313 on the transition part 230 and effectively preventing foreign objects from falling between the third protective part 313 and the transition part 230.

[0159] Please see Figures 15-17 In some embodiments, the protective film 300 is configured with a notch 314.

[0160] The notch 314 can be of any shape and in any number. Since the end cap body 210 is lower in height than the first opening 110, the maximum dimension d1 of the first protective portion 311 is larger. Conversely, since the protrusion 220 is higher in height than the first opening 110, the maximum dimension d2 of the second protective portion 312 is smaller.

[0161] When a protective film 300 of the same size is used to attach the end cap 200, its normal appearance should be as follows: Figure 10 As shown, there is a gap 330. That is, the suspended and taut third protective part 313 is one side of a triangle, and the transition body 231 and the first transition area 232 are the other two sides of this triangle. According to the property that the sum of any two sides of a triangle is greater than the length of the third side, the total area of ​​the transition body 231 and the first transition area 232 will be greater than the area of ​​the taut third protective part 313 above it. Therefore, in order for the third protective part 313 to adhere to the entire transition part 230, a notch 314 needs to be provided on the protective film 300. By reducing the adhesion of the protective film 300 at the notch 314, the third protective part 313 can adhere to the transition part 230. In other words, if the third protective part 313 needs to adhere to the entire transition part 230, the length of the protective film 300 is insufficient. Therefore, it is necessary to sacrifice the method of adhering the protective film 300 at the notch 314 in order to allow the third protective part 313 to adhere to the transition part 230.

[0162] Please see Figures 15-17 In some embodiments, the notch 314 is configured with a second opening 3141; the second opening 3141 is opened toward the inner side of the first opening 110.

[0163] An opening is constructed at the notch 314 to facilitate its formation and processing. For example, it can be formed by simply cutting an opening in the protective film 300 with a tool.

[0164] By constructing a second opening 3141 on the notch 314 and opening the second opening 3141 towards the inside of the first opening 110, that is, opening it away from the membrane body 320, it is easier to form the notch 314. Compared with setting the second opening 3141 on the side close to the membrane body 320, the preparation process is simpler and can effectively avoid damage to the membrane body 320.

[0165] Please see Figures 15-17 In some embodiments, the notch 314 includes two sides connected to each other; the two sides extend from the outer periphery of the first opening 110 toward the inner side of the first opening 110; the two sides together enclose to form a second opening 3141.

[0166] The two sides can be symmetrical or asymmetrical. The two sides can be straight, curved, or any other shape, such as serrated, without any special restrictions.

[0167] The second opening 3141 is formed by two sides extending from the outer periphery of the first opening 110 toward the inner side of the first opening 110, which makes the processing of the second opening 3141 more convenient.

[0168] Please see Figures 15-17 In some embodiments, the notch 314 includes a first side 3142 and a second side 3143 arranged symmetrically.

[0169] The shapes of the first side 3142 and the second side 3143 are not specifically limited. For example, they can be straight, curved, serrated, or any other arbitrary shape.

[0170] By setting the notch 314 as a symmetrically arranged first side 3142 and second side 3143, the tension exerted by the protective membrane 300 on the two sides after the formation of the first side 3142 and the second side 3143 is also more balanced, thereby preventing the notch 314 from further expanding and extending to the second transition membrane.

[0171] Please see Figure 12 and Figure 13 In some embodiments, the protective film 300 further includes a supplementary sub-film 340; the supplementary sub-film 340 is disposed on the side of the notch 314 opposite to the end cap 200.

[0172] The supplementary membrane 340 can be made of the same material as the protective membrane 300, which is also an insulating protective membrane.

[0173] By providing a supplementary membrane 340 on the side of the notch 314 away from the end cap 200, the end cap 200 at the notch 314 is insulated and protected by the supplementary membrane 340, thereby improving the insulation protection effect for the entire battery cell 1100.

[0174] Please see Figure 12 In some embodiments, the supplementary membrane 340 includes a shielding portion 341 and a connecting portion 342. The shielding portion 341 is adhered above the notch 314 and surrounds the outer periphery of the notch 314; the connecting portion 342 is connected to the shielding portion 341 and is adhered to the outer peripheral wall 120 of the housing 100.

[0175] The shielding part 341 and the connecting part 342 can be long strip structures of the same size, or they can be other irregular structures of different sizes.

[0176] The shielding portion 341 surrounds the outer periphery of the notch 314, meaning that the shielding portion 341 can cover the entire notch 314, thereby effectively protecting the end cap 200 below the notch 314. The connecting portion 342 is used to better fix the shielding portion 341 to the housing 100. It is adhered to the outer peripheral wall 120 of the housing 100. When the membrane body 320 is attached to the outer peripheral wall 120 of the housing 100, the connecting portion 342 is directly adhered to the membrane body 320.

[0177] Please see Figure 15 In some embodiments, the notch 314 is provided on the third protective portion 313. The notch 314 may be directly provided on the third protective portion 313 where the height changes, for example above the transition body 231, above the first transition region 232, or above the second transition region 233.

[0178] By setting the notch 314 on the third protective part 313 where the height changes, the flatness of the protective film 300 can be easily adjusted at this point, resulting in better adhesion of the protective film 300.

[0179] Please see Figure 15 In some embodiments, the notch 314 is located above the transition body 231.

[0180] A second opening 3141 is directly made on the side of the transition body 231 away from the membrane body 320 using a processing tool, thereby forming a notch 314, which is a relatively convenient processing method.

[0181] Because the slope at the transition body 231 is relatively even, it is easy to cut when the notch 314 is located above the transition body 231. After cutting, the two sides of the notch 314 can be more evenly attached to the transition body 231.

[0182] Please see Figure 16 In some embodiments, a notch 314 is provided on the first protective portion 311.

[0183] The notch 314 can be set at any position of the first protective part 311, such as at the end of the first protective part 311 away from the transition part 230, or it can be set in the middle of the first protective part 311, or at the end of the first protective part 311 close to the transition part 230. There are no special limitations on this.

[0184] Because the first protective part 311 is relatively large, when the notch 314 is provided on the first protective part 311, the operator has more processing space when shearing to form the notch 314, and is less likely to be interfered with by other structures.

[0185] Please see Figure 16 In some embodiments, the transition portion 230 includes a transition body 231 and a first transition region 232. The first transition region 232 connects the end cap body 210 and the transition body 231; the distance d4 between the notch 314 and the first transition region 232 satisfies the condition: d4 < 5 mm.

[0186] The first transition zone 232 is provided with a first transition fillet 2321, so the first transition zone 232 is a curved surface structure, and the deformation and stress here are also relatively large.

[0187] By setting the distance d4 between the notch 314 and the first transition zone 232 to less than 5mm, the distance between the notch 314 and the first transition zone 232 is made too small. This effectively reduces the stress of the protective film 300 in the first transition zone 232 by utilizing the stress release at the notch 314, and also facilitates the adjustment of the flatness of the first transition zone 232.

[0188] In one specific embodiment, the distance d4 between the notch 314 and the first transition region 232 is 1 mm. In another specific embodiment, the distance d4 between the notch 314 and the first transition region 232 is 4.9 mm. In yet another specific embodiment, the distance d4 between the notch 314 and the first transition region 232 is 3 mm.

[0189] Please see Figure 17 In some embodiments, a notch 314 is provided on the second protective portion 312.

[0190] The notch 314 can be set at any position of the second protective part 312, such as at the end of the second protective part 312 away from the transition part 230, or it can be set in the middle of the second protective part 312, or at the end of the second protective part 312 close to the transition part 230. There are no special limitations on this.

[0191] Because the second protective part 312 is larger in size, when the notch 314 is set on the second protective part 312, the operator has more processing space when shearing to form the notch 314, and is less likely to be interfered with by other structures.

[0192] Please see Figure 17 In some embodiments, the transition portion 230 includes a transition body 231 and a second transition region 233. The second transition region 233 connects the protrusion 220 and the transition body 231; the distance d5 between the notch 314 and the second transition region 233 satisfies the condition: d5 < 5 mm.

[0193] The second transition zone 233 is provided with a second transition fillet 2331, so the second transition zone 233 is a curved surface structure, and the deformation and stress here are also relatively large.

[0194] By setting the distance d5 between the notch 314 and the second transition zone 233 to less than 5mm, the distance between the notch 314 and the second transition zone 233 is made too small. This effectively reduces the stress of the protective film 300 in the second transition zone 233 by utilizing the stress release at the notch 314, and also facilitates the adjustment of the flatness of the second transition zone 233.

[0195] In one specific embodiment, the distance d5 between the notch 314 and the second transition region 233 is 1 mm. In another specific embodiment, the distance d5 between the notch 314 and the second transition region 233 is 4.9 mm. In yet another specific embodiment, the distance d5 between the notch 314 and the second transition region 233 is 3 mm.

[0196] In some embodiments, the battery cell further includes a terminal post disposed on the protrusion 220.

[0197] As channels for current flow, the terminals ensure that electrical energy generated within the battery cell can be smoothly transmitted to external loads or power systems. Furthermore, the terminals provide a reliable physical interface for connectors, cables, or other wires, guaranteeing a long-term, stable electrical connection.

[0198] By projecting the electrode posts onto the protrusion 220, the electrode posts do not affect the capacity of the battery cell assembly, thereby increasing the cell capacity. At the same time, more space is provided for the electrode post placement, preventing interference between the protective film 300 and the electrode post, and enhancing safety.

[0199] The battery cell 1100 provided in this application embodiment includes a housing 100, an end cap 200, and a protective film 300. The housing 100 has a first opening 110; the end cap 200 covers the first opening 110, and the end cap 200 includes an end cap body 210, a protrusion 220 protruding from the end cap body 210 away from the housing 100, and a transition portion 230 connecting the end cap body 210 and the protrusion 220; the protective film 300 includes a first protective portion 311, a second protective portion 312, and a third protective portion 313 that are at least partially surrounding the connection between the end cap 200 and the housing 100 and disposed above the end cap 200, and a film body 320 connected to the first protective portion 311, the second protective portion 312, and the third protective portion 313. A first protective part 311 is disposed on the end cap body 210, a third protective part 313 is disposed on the transition part 230, and a second protective part 312 is disposed on the protrusion 220; wherein, the end cap body 210 and the protrusion 220 are arranged along a first direction; the dimension d of the first protective part 311 at any position along the second direction is... 11 The second protective part 312 at any position is equal to the dimension d along the second direction. 21The sum of the protrusion height h1 of the protrusion 220 at that location relative to the protrusion height h1 of the end cap body 210; the second direction is perpendicular to the first direction and parallel to the plane on which the end cap body 210 is located. Furthermore, a notch 314 is formed on the protective film 300, and a supplementary sub-film 340 is provided on the side of the notch 314 away from the end cap 200.

[0200] When the protective film 300 is attached to the end cap 200 during the manufacturing process of the battery cell 1100 provided in this application embodiment, a protective film 300 of uniform width can be directly attached, reducing the steps of adjusting the protective film 300 in the height variation area of ​​the end cap 200. This reduces the process difficulty of attaching the protective film 300 to the end cap 200, making the manufacturing process of the battery cell 1100 more time-saving. Moreover, through the combined action of the first protective part 311, the second protective part 312, the third protective part 313, and the film body 320, the protective film 300 can not only protect the end cap 200, but also protect the outer peripheral wall 120 of the housing 100, thereby effectively protecting the outer surface of the entire battery cell 1100. This results in better insulation protection between adjacent battery cells 1100, and ultimately, a safer battery device 1000. Simultaneously, by limiting the dimension d of the first protective part 311 along the second direction at any position... 11 The second protective part 312 at any position is equal to the dimension d along the second direction. 21 The sum of the protrusion height h1 of the protrusion 220 at this position relative to the protrusion height h1 of the end cap body 210 ensures that when the protective film 300 is attached to the top of the end cap 200, even if the end cap 200 has a protrusion 220 or the height of the protrusion 220 at different positions is inconsistent, the same size protective film 300 can still be used to attach to the outer peripheral wall 120 of the entire housing 100 and the top of the end cap 200. This reduces the process of replacing protective films 300 of different sizes, reduces the difficulty of attaching the protective film 300 to the battery cell 1100, and also makes the manufacturing process of the battery cell 1100 more time-saving. Furthermore, the first protective part 311, the second protective part 312, and the third protective part 313 together provide effective insulation protection for the connection between the end cap 200 and the housing 100; and a notch 314 is provided on the protective film 300, and the notch 314 is covered by the supplementary sub-film 340, so that the third protective part 313 can be effectively attached to the transition part 230. The final battery cell 1100 not only has high manufacturing efficiency, but also better insulation effect and is safer to use.

[0201] Please see Figure 2This application also provides a battery device 1000, which includes a housing 1200 and a battery cell 1100 as described in any of the above embodiments. The housing 1200 is configured with a receiving space 1210; the battery cell 1100 is housed in the receiving space 1210.

[0202] When the battery device 1000 provided in this application embodiment is used, since the end cap 200 of the battery cell 1100 in the housing 1200 includes an end cap body 210 and a protrusion 220 protruding from the end cap body 210 on the side opposite to the housing 100, the entire end cap 200 includes areas of different heights. When the protective film 300 is placed around the connection between the end cap 200 and the housing 100 and positioned above the end cap 200, the maximum dimension d1 of the first protective portion 311 on the end cap body 210 can be processed to be smaller than the maximum dimension d2 of the second protective portion 312 on the protrusion 220. That is, the width d1 of the protective film 300 at the higher protrusion 220 is smaller than the width d2 of the protective film 300 at the lower end cap body 210. This allows for the direct application of a protective film 300 with a consistent width when attaching it to the end cap 200, reducing the need for adjustments to the protective film 300 in areas of varying height on the end cap 200. This lowers the difficulty of attaching the protective film 300 to the end cap 200 and makes the manufacturing process of the battery cell 1100 more time-efficient. Consequently, the manufacturing speed of the battery device 1000 is faster, and production efficiency is effectively improved.

[0203] In some embodiments, the protrusion 220 is used for adhesive connection with the housing 1200.

[0204] The protrusion 220 can be bonded to the housing 1200 using a high-strength, high-temperature resistant, and chemically corrosion-resistant adhesive. For example, in the installation of some ultra-thin or irregularly shaped batteries, thermally conductive adhesive can be used to bond the battery cell 1100 to the housing 1200, which not only secures the battery cell 1100 but also provides some heat conduction, aiding in battery heat dissipation. This method provides a tight connection and can accommodate various shapes of battery cells 1100 and housings 1200.

[0205] By bonding the protrusion 220 to the housing 1200, the bonding area between the protrusion 220 and the housing 1200 is increased, thereby making the connection stability between the two higher when the battery cell 1100 is housed in the housing space 1210.

[0206] Please see Figure 1 This application also provides an electrical device, which includes the battery device 1000 described in any of the above embodiments, the battery device 1000 being used to provide electrical energy to the electrical device.

[0207] When the electrical device provided in this application embodiment is in use, the battery device 1000 composed of the battery cells 1100 provided in this application embodiment provides electrical energy to the electrical device. Since the end cap 200 of the battery cell 1100 includes an end cap body 210 and a protrusion 220 protruding from the end cap body 210 on the side opposite to the housing 100, the entire end cap 200 includes areas of different heights. When the protective film 300 is placed around the connection between the end cap 200 and the housing 100 and positioned above the end cap 200, the maximum dimension d1 of the first protective part 311 on the end cap body 210 can be processed to be smaller than the maximum dimension d2 of the second protective part 312 on the protrusion 220. That is, the width d1 of the protective film 300 at the higher protrusion 220 is smaller than the width d2 of the protective film 300 at the lower end cap body 210. This allows for the use of a protective film 300 with a consistent width for direct application when attaching the protective film 300 to the end cap 200, reducing the need for adjustments to the protective film 300 in areas of varying height on the end cap 200. This reduces the difficulty of attaching the protective film 300 to the end cap 200, making the manufacturing process of the battery cell 1100 more time-efficient, and thus accelerating the manufacturing speed of the electrical device and effectively improving production efficiency.

[0208] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized by, The battery cell comprises: a housing (100) configured with a first opening (110); an end cover (200) covering the first opening (110), the end cover (200) comprising: an end cover body (210); a protrusion (220) protruding from the end cover body (210) on a side away from the housing (100); and a protective film (300) at least partially surrounding a connection between the end cover (200) and the housing (100), the protective film (300) comprising: a first protective portion (311) disposed on a side of the end cover body (210) away from an interior of the battery cell; and a second protective portion (312) disposed on a side of the protrusion (220) away from the interior of the battery cell; wherein, along an outer periphery of the end cover (200) toward an inner side of the end cover (200), a maximum dimension d1 of the first protective portion (311) is greater than a maximum dimension d2 of the second protective portion (312).

2. The battery cell of claim 1, wherein, The protective film (300) further comprises a film body (320); the film body (320) is connected with the first protective portion (311) and the second protective portion (312); The film body (320) is disposed on an outer peripheral wall (120) of the housing (100), and the outer peripheral wall (120) is disposed around the first opening (110).

3. The battery cell of claim 2, wherein, The end cover body (210) and the protrusion (220) are arranged in a first direction; a dimension d of the first protective portion (311) in a second direction at any position 11 is equal to a dimension d of the second protective portion (312) in the second direction at any position 21 and a sum of a convex height h1 of the convex portion (220) at this position compared to the end cover body (210) The second direction is perpendicular to the first direction, and the second direction is parallel to a plane in which the end cover body (210) is located.

4. The battery cell according to claim 2 or 3, characterized in that, The end cover (200) further comprises a transition portion (230); The transition portion (230) connects the end cover body (210) and the protrusion (220).

5. The battery cell of claim 4, wherein, The transition portion (230) comprises: a transition body (231); and a first transition region (232) connected between the end cover body (210) and the transition body (231).

6. The battery cell of claim 5, wherein, The first transition region (232) has a first transition fillet (2321).

7. The battery cell of claim 5, wherein, The transition portion (230) further comprises a second transition region (233); The second transition region (233) is connected between the protrusion (220) and the transition body (231).

8. The battery cell of claim 7, wherein, The second transition region (233) has a second transition fillet (2331).

9. The battery cell of claim 5, wherein, The protective film (300) further comprises a third protective portion (313); The third protective portion (313) is connected between the first protective portion (311) and the second protective portion (312); The third protective portion (313) is disposed on a side of the transition portion (230) away from the first opening (110).

10. The battery cell of claim 9, wherein, The third protective portion (313) comprises an inner side side edge (3131) close to an inner side of the first opening (110); The inner side side edge (3131) extends obliquely from the end cover body (210) toward a side of the protrusion (220).

11. The battery cell of claim 9, wherein, The maximum size d3 of the third protection part (313), the maximum size d1 of the first protection part (311), and the maximum size d2 of the second protection part (312) satisfy the condition: d2 < d3 ≤ d1.

12. The battery cell of claim 9, wherein, The size of the third protection part (313) gradually decreases from the first protection part (311) to the side of the third protection part (313) along the direction of the outer periphery of the first opening (110) to the inner side of the first opening (110).

13. The battery cell of any one of claims 9-12, wherein, The third protection part (313) and the transition part (230) have a gap (330) therebetween.

14. The battery cell of any one of claims 9-12, wherein, The third protection part (313) and the transition part (230) are in abutment.

15. The battery cell of claim 14, wherein, The protective film (300) is configured with a notch (314).

16. The battery cell of claim 15, wherein, The notch (314) is configured with a second opening (3141); The second opening (3141) is formed towards the side away from the inner side of the first opening (110).

17. The battery cell of claim 16, wherein, The notch (314) includes two side edges connected to each other; The two side edges respectively extend from the outer periphery of the first opening (110) to the inner side of the first opening (110); The two side edges together enclose the second opening (3141).

18. The battery cell of claim 17, wherein, The notch (314) includes a first side edge (3142) and a second side edge (3143) symmetrically arranged.

19. The battery cell of claim 15, wherein, The protective film (300) further includes a supplemental sub-film (340); The supplemental sub-film (340) is arranged on the side of the notch (314) away from the end cover (200).

20. The battery cell of claim 19, wherein, The supplemental sub-film (340) includes: a shielding part (341) adhered above the notch (314), and the shielding part (341) encloses the outer periphery of the notch (314); and a connecting part (342) connected with the shielding part (341) and adhered to the outer peripheral wall of the shell (100).

21. The battery cell of claim 15, wherein, The notch (314) is arranged on the third protection part (313).

22. The battery cell of claim 21, wherein, The notch (314) is located above the transition body (231).

23. The battery cell of claim 15, wherein, The notch (314) is arranged on the first protection part (311).

24. The battery cell of claim 23, wherein, The transition part (230) includes: a transition body (231); and a first transition zone (232) connected between the end cover body (210) and the transition body (231); The distance d4 between the notch (314) and the first transition zone (232) satisfies the condition: d4 < 5 mm.

25. The battery cell of claim 15, wherein, The notch (314) is arranged on the second protection part (312).

26. The battery cell of claim 25, wherein, The transition part (230) includes: a transition body (231); and a second transition zone (233) connected between the convex part (220) and the transition body (231); The distance d5 between the notch (314) and the second transition zone (233) satisfies the condition: d5 < 5 mm.

27. The battery cell of claim 1, wherein, The battery monomer further includes a pole; The pole is arranged on the convex part (220).

28. A battery device, characterized by It includes: a box body (1200) configured with an accommodation space (1210); and The battery cell (1100) as claimed in any one of claims 1-27, is housed within the housing space (1210).

29. The battery device of claim 28, wherein, The protrusion (220) is used for adhesive connection with the box (1200).

30. An electrical device, comprising: Comprising: The battery device as claimed in claim 28 or 29, is used to provide electric energy for the electric device.

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