Battery monomer, battery device and electric equipment

Abstract

The utility model relates to a battery monomer, a battery device and electric equipment, and the battery monomer comprises a shell, a battery module and a battery module, the end cover is connected with the shell and covers the opening, and the end cover comprises a cover body and a convex hull connected with the cover body; the electrode terminal is mounted on the convex hull; the insulating film comprises a film body and a flanging part, and the outer surface of the shell is coated with the film body; the flanging part comprises a first flanging section and a second flanging section, the first flanging section covers the edge of the surface of the side, back to the interior of the shell, of the cover body, the second flanging section covers the edge of the surface of the side, back to the interior of the shell, of the convex hull, and the width of the first flanging section is smaller than that of the second flanging section. On the basis that the insulation protection effect on the periphery of the electrode terminal is guaranteed, when the end cover is bonded with the battery box or other parts in the battery box, the bonding area of the area, not covered by the flanging part, on the cover body is large, and then the bonding strength can be improved.

Description

Technical Field

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

[0002] A battery assembly typically includes a battery case and individual battery cells. Each battery cell includes an end cap, a housing, a cell assembly, and other functional components. The housing, in conjunction with the end cap, forms the internal environment of the battery cell. The cell assembly, electrolyte, and other functional components are located within this internal environment. Electrode terminals are located on the end cap. These terminals are used for electrical connection to the cell assembly to input or output electrical energy from the battery cell.

[0003] During battery assembly, the end caps of individual battery cells need to be bonded to the battery box or other components within the battery box. In related technologies, the end caps of individual battery cells have protrusions that can accommodate electrode terminals, thereby reducing the space occupied by the electrode terminals within the casing and increasing the installation space for the cell assembly. To insulate and protect the battery cells, the outer surface of the battery cell casing is also covered with an insulating film, the edges of which are bent towards the outer surface of the end cap to form a flange. However, during battery assembly, the bonding strength of these end caps to the battery box or other components within the battery box is relatively low. Utility Model Content

[0004] In view of the above problems, this application provides a battery box, a battery device, and an electrical device that can reduce the weight of the battery device.

[0005] In a first aspect, this application provides a battery cell, the battery cell comprising:

[0006] The casing has an opening at one end;

[0007] An end cap is connected to the housing and covers the opening. The end cap includes a cap body and a protrusion connected to the cap body. The protrusion protrudes out of the cap body in a direction away from the interior of the housing.

[0008] Electrode terminals, the electrode terminals being mounted on the bulge and at least partially located inside the bulge; and

[0009] An insulating film includes a film body and a flanged portion connected to the edge of the film body. The film body covers the outer surface of the housing. The flanged portion includes a first flanged section and a second flanged section. The first flanged section covers the edge of the surface of the cover body facing away from the inside of the housing, and the second flanged section covers the edge of the surface of the convex bulge facing away from the inside of the housing. The width of the first flanged section is smaller than the width of the second flanged section.

[0010] In the aforementioned battery cell, the electrode terminals are mounted on the protrusion. Because the second flanged section covers the edge of the protrusion's surface facing away from the housing interior, its width is relatively large, thus maximizing insulation protection around the electrode terminals. While ensuring insulation protection around the electrode terminals, the width of the first flanged section can be relatively small, meaning the area covered by the first flanged section on the cover body is smaller, and the area not covered by the flanged section is relatively larger. Therefore, when the end cover is bonded to the battery box or other components within the battery box, the bonding area of ​​the cover body not covered by the flanged section is larger, thereby increasing the bonding strength.

[0011] In one embodiment, the bulge includes a top wall and a side wall, one end of the side wall being connected to the cover body and protruding from the cover body toward the side opposite to the interior of the housing; the end of the side wall away from the cover body is connected to the top wall;

[0012] The flanged portion includes a transition flanged section, one end of which is connected to the first flanged section, and the other end of which is connected to the second flanged section; the transition flanged section covers the edge of the outer surface of the side wall, and the second flanged section covers the edge of the outer surface of the top wall.

[0013] The first flanged section covers the surface of the cover body, the second flanged section covers the edge of the outer surface of the top wall, and the transition flanged section covers the edge of the outer surface of the side wall, thus fully and comprehensively covering the edge of the end cover and achieving a good insulation and protection effect.

[0014] In one embodiment, the width of the transition flange gradually increases from the end of the transition flange closer to the first flange to the end of the transition flange closer to the second flange. Because the width of the transition flange gradually increases, the side of the transition flange furthest from the membrane body can transition more smoothly, resulting in a more regular structure in the connection area between the first and second flanges, making it less prone to damage.

[0015] In one embodiment, the end of the transition flange segment near the first flange segment has the same width as the first flange segment, and the end of the transition flange segment near the second flange segment has the same width as the second flange segment.

[0016] The width of the transition flange section gradually increases from the end of the transition flange section closest to the first flange section to the end of the transition flange section closest to the second flange section.

[0017] Therefore, the side of the transition flange section away from the membrane body, the connection between the side and the first flange section, and the connection between the side and the second flange section are all smooth transitions, which makes the structure of the flange part in the connection area between the first flange section and the second flange section more regular and less prone to damage.

[0018] In one embodiment, the first flange section, the transition flange section, and the second flange section are a continuous, integral structure. The transition flange section is in a tensioned state, and there is a gap between the transition flange section and the sidewall.

[0019] The first flange section, the transition flange section, and the second flange section are a continuous integrated structure. When the flange section bends inward from the edge of the end cap, the first flange section and the second flange section can be flat and fitted. The transition flange section is in a taut state and has a gap with the side wall, so that the entire flange section can be covered in one go, thus making the flange operation simple.

[0020] In one embodiment, the flange portion is provided with a notch, and the notch extends from the side of the flange portion away from the membrane body to the side closer to the membrane body; the notch has opposing first notch walls and second notch walls; along the length direction of the flange portion, the arrangement direction of the first notch walls and the second notch walls is the same as the arrangement direction of the first flange segment and the second flange segment.

[0021] The notch is located at any position between the first and second extreme positions, so that the transition flange section fits the edge of the outer surface of the sidewall.

[0022] The first extreme position is: the notch is located on the first flange section, and the distance d1 from the second notch wall to the transition flange section is 5mm; the second extreme position is: the notch is located on the second flange section, and the distance d2 from the first notch wall to the transition flange section is 5mm.

[0023] After opening a notch in the aforementioned position range on the flange, the notch can release the tension of the transition flange section and allow the transition flange section to fit against the side wall, thereby enabling the transition flange section to fit against the edge of the outer surface of the side wall without leaving a gap between the transition flange section and the outer surface of the side wall. In this way, dirt and grime are less likely to accumulate between the transition flange section and the side wall due to gaps.

[0024] In one embodiment, the first notch wall and the second notch wall are located in the transition flange section. Therefore, the transition flange section is divided into two parts located on both sides of the notch, which can better release the tension of the transition flange section, thereby allowing the transition flange section to fit more closely to the sidewall.

[0025] In one embodiment, the first notch wall and the second notch wall are set at an angle. In the actual operation of creating the notch, a slit can be cut in the above-mentioned position range of the flange portion. This slit can release the tension of the transition flange section. Then, the transition flange section is attached to the side wall. At this time, the slit will open, and the two sides of the slit will form an angle, thus presenting a structure in which the first notch wall and the second notch wall are set at an angle.

[0026] This embodiment creates a notch structure in which the first notch wall and the second notch wall are set at an angle, which facilitates operation.

[0027] In one embodiment, the battery cell further includes an insulating patch that is attached to the flange and covers the notch. By attaching the insulating patch to the flange and covering the notch, insulation protection can be provided at the notch.

[0028] In one embodiment, the insulating patch includes a first patch segment and a second patch segment connected to the first patch segment. The first patch segment is attached to the film body, and the second patch segment is bent relative to the first patch segment toward the flange and attached to the flange, and the second patch segment covers the gap.

[0029] In one embodiment, along the width direction of the flange, the insulating patch protrudes from the flange on the side away from the membrane body. The portion of the insulating patch protruding from the flange on the side away from the membrane body can fit into the non-flange area of ​​the end cap, thereby making the coverage area of ​​the insulating patch larger, thus making the coverage of the gap more reliable, and the insulating patch less likely to separate from the gap.

[0030] Secondly, this application provides a battery device, including a battery box and any of the battery cells in the above embodiments, wherein the battery cells are located inside the battery box.

[0031] In the aforementioned battery device, the battery cells have their electrode terminals mounted on a raised bulge. Because the second flanged section covers the edge of the raised bulge facing away from the interior of the housing, its width is relatively large, thus maximizing insulation protection around the electrode terminals. While ensuring insulation protection around the electrode terminals, the width of the first flanged section can be relatively small, meaning the area covered by the first flanged section on the cover body is smaller, and the area not covered by the flanged section on the cover body is relatively larger. Therefore, when the end cover is bonded to the battery box or other components within the battery box, the bonding area of ​​the area not covered by the flanged section on the cover body is larger, thereby improving the bonding strength.

[0032] Thirdly, this application provides an electrical device including the aforementioned battery device, which is used to provide electrical energy to the electrical device.

[0033] In the battery assembly of the aforementioned electrical equipment, the electrode terminals of each battery cell are mounted on a raised bulge. Because the second flanged section covers the edge of the raised bulge facing away from the interior of the housing, its width is relatively large, thus maximizing the insulation protection around the electrode terminals. While ensuring insulation protection around the electrode terminals, the width of the first flanged section can be relatively small, meaning the area covered by the first flanged section on the cover body is smaller, and the area not covered by the flanged section on the cover body is relatively larger. Therefore, when the end cover is bonded to the battery box or other components within the battery box, the bonding area of ​​the area not covered by the flanged section on the cover body is larger, thereby improving the bonding strength.

[0034] 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

[0035] 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:

[0036] Figure 1 This is a schematic diagram of the structure of a vehicle according to some embodiments of this application.

[0037] Figure 2 This is an exploded structural diagram of a battery according to some embodiments of this application.

[0038] Figure 3 This is an exploded structural diagram of a battery cell according to some embodiments of this application.

[0039] Figure 4 This is a schematic diagram of the structure of a battery cell according to some embodiments of this application.

[0040] Figure 5 for Figure 4 A magnified view of a portion of region A in the middle.

[0041] Figure 6 for Figure 4 The top view of the battery cell shown.

[0042] Figure 7 for Figure 6 A sectional view of section BB.

[0043] Figure 8 for Figure 7 A magnified view of a portion of region C.

[0044] Figure 9 This is a partial schematic diagram of a battery cell at the transition flange section, according to another embodiment.

[0045] Figure 10 This is a partial schematic diagram of a battery cell at the transition flange section in another embodiment.

[0046] Figure 11 This is a partial schematic diagram of a battery cell at the transition flange section in another embodiment.

[0047] Figure 12This is a partial schematic diagram of a battery cell at the transition flange section in one embodiment.

[0048] The reference numerals in the detailed embodiments are as follows:

[0049] 1-Vehicle;

[0050] 10-Battery device;

[0051] 100 - Battery box; 110 - Box body; 120 - Top cover;

[0052] 200 - Battery cell; 210 - Housing; 211 - Cell assembly; 220 - End cap; 221 - Cap body; 222 - Protrusion; 2221 - Top wall; 2222 - Side wall;

[0053] 230 - Electrode terminal;

[0054] 240. Insulating film; 241. Film body; 242. Flanged portion; 2421. First flanged section; 2422. Second flanged section; 2423. Transition flanged section; 2423b. Gap; 2424. Notch; 2424a. First notch wall; 2424b. Second notch wall; 250. Insulating patch; 251. First patch section; 252. Second patch section;

[0055] 20-Controller;

[0056] 30-Motor. Detailed Implementation

[0057] 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.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] 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).

[0063] 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.

[0064] 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.

[0065] 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.

[0066] A battery assembly typically includes a battery case and individual battery cells. Each battery cell includes an end cap, a housing, a cell assembly, and other functional components. The housing, in conjunction with the end cap, forms the internal environment of the battery cell. The cell assembly, electrolyte, and other functional components are located within this internal environment. Electrode terminals are located on the end cap. These terminals are used for electrical connection to the cell assembly to input or output electrical energy from the battery cell.

[0067] During battery assembly, the end caps of individual battery cells need to be bonded to the battery box or other components within the battery box. For example, the end cap can be bonded to a cooling plate inside the battery box to dissipate heat and cool the battery cell. Alternatively, the end cap can be connected to an insulating reinforcing plate inside the battery box to improve the structural strength of the battery cell. Still another example is that the end cap can be bonded to the inside of the battery box to fix the battery cell relatively to the battery box.

[0068] In related technologies, battery cells have protrusions on their end caps. These protrusions accommodate electrode terminals, reducing the space occupied by the terminals within the casing and increasing installation space for the cell assembly. To insulate and protect the battery cell, the outer surface of the casing is covered with an insulating film, the edges of which are bent towards the outer surface of the end cap to form a flange. However, during battery assembly, the end cap of this battery cell exhibits low bonding strength when bonded to the battery box or other components within it. This is because the edge of the end cap's outer surface is covered by the flange, meaning only the area not covered by the flange on the outer surface of the end cap can be used for bonding to the battery box or other components. This results in a small bonding area for the end cap, leading to low bonding strength. Since battery cells input and output electrical energy through electrode terminals, which typically need to connect to other conductors, high insulation protection is required around the electrode terminals. Increasing the bonding area (i.e., the area not covered by the flange) by reducing the width of the flange reduces the insulation coverage area of ​​the flange over the end cap, further deteriorating the insulation protection around the electrode terminals.

[0069] Based on the above considerations, in order to solve the problem of low bonding strength when the end cap of a battery cell is bonded to the battery box or other components within the battery box in related technologies, this application designs a battery cell in which the flanged section (first flanged section) corresponding to the non-convex area of ​​the end cap and the flanged section (second flanged section) corresponding to the convex area have unequal widths. The second flanged section is relatively wider, thereby ensuring the insulation and protection effect around the electrode terminals as much as possible. The first flanged section is narrower, so that when the end cap is bonded to the battery box or other components within the battery box, the bonding area of ​​the non-convex area not covered by the flanged section is larger, thereby improving the bonding strength.

[0070] The battery device disclosed in this application can be used, but is not limited to, in electrical devices such as vehicles, ships, or aircraft. Specifically, the electrical device can be, but is not limited to, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc. By using the battery device disclosed in this application to form the power system of the electrical device, the weight of the battery device can be reduced.

[0071] For ease of explanation, the following embodiments will be described using a vehicle 1 as an example of an electrical device from some embodiments of this application.

[0072] Please refer to Figure 1 , Figure 1 The diagram illustrates the structure of a vehicle 1 according to some embodiments of this application. Vehicle 1 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 10 is installed inside vehicle 1, and the battery device 10 can be located at the bottom, front, or rear of vehicle 1. The battery device 10 can be used to power vehicle 1; for example, the battery device 10 can serve as the operating power source for vehicle 1. Vehicle 1 may also include a controller 20 and a motor 30. The controller 20 controls the battery device 10 to supply power to the motor 30, for example, to meet the power needs of vehicle 1 during starting, navigation, and driving.

[0073] In some embodiments of this application, the battery device 10 can not only serve as the operating power source for the vehicle 1, but also as the driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0074] Please refer to Figure 2 , Figure 2This is an exploded view of a battery provided in some embodiments of this application. The battery device 10 includes a battery case 100 and battery cells 200. The battery cells 200 are housed within the battery case 100. The battery case 100 provides a space for the battery cells 200, and the battery case can have various structures. In some embodiments, the battery case 100 may include a top cover 120 and a body 110, with the top cover 120 and body 110 overlapping each other, together defining a cavity for accommodating the battery cells 200. The body 110 may be a hollow structure with one open end, and the top cover 120 may be a plate-like structure, fitting over the open side of the body 110 so that the top cover 120 and body 110 together define the cavity; alternatively, both the top cover 120 and body 110 may be hollow structures with one open side, with the open side of the top cover 120 fitting over the open side of the body 110. Of course, the battery box 100 formed by the top cover 120 and the box body 110 can be of various shapes, such as cylinder, cuboid, etc.

[0075] In the battery device 10, there can be multiple battery cells 200, which can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 200 are connected in both series and parallel connections. Multiple battery cells 200 can be directly connected in series, parallel, or in a mixed configuration, and then the entire assembly of the multiple battery cells 200 is housed within the battery box 100. Alternatively, the battery device 10 can also consist of multiple battery cells 200 first connected in series, parallel, or in a mixed configuration to form battery modules, and then these battery modules are connected in series, parallel, or in a mixed configuration to form a whole, which is then housed within the battery box 100. The battery device may also include other structures; for example, it may include a busbar component for electrical connection between the multiple battery cells 200.

[0076] Each battery cell 200 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 200 can be cylindrical, flat, cuboid, or other shapes.

[0077] Please see Figure 3 , Figure 3 It shows Figure 2 The image shows an exploded view of a single battery cell 200. The single battery cell 200 refers to the smallest unit that makes up the battery assembly 10. Figure 3 The battery cell 200 includes an end cap 220, a housing 210, a cell assembly 211, and other functional components.

[0078] End cap 220 refers to a component that covers the opening of housing 210 to isolate the internal environment of battery cell 200 from the external environment. The shape of end cap 220 can be adapted to the shape of housing 210 to fit it. Optionally, end cap 220 can be made of a material with certain hardness and strength (such as aluminum alloy), so that end cap 220 is not easily deformed under pressure and impact, giving battery cell 200 higher structural strength and improved safety performance. Functional components such as electrode terminals 230 can be provided on end cap 220. Electrode terminals 230 can be used for electrical connection with cell assembly 211 for outputting or inputting electrical energy to battery cell 200. In some embodiments, end cap 220 may also be provided with a pressure relief mechanism for releasing internal pressure when the internal pressure or temperature of battery cell 200 reaches a threshold. The end cap 220 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 220. The insulating structure can be used to isolate the electrical connection components in the housing 210 from the end cap 220 to reduce the risk of short circuit. For example, the insulating structure can be plastic, rubber, etc.

[0079] The housing 210 is a component used to cooperate with the end cap 220 to form the internal environment of the battery cell 200. This internal environment can accommodate the cell assembly 211, electrolyte, and other components. The housing 210 and the end cap 220 can be independent components. An opening can be provided on the housing 210, and the end cap 220 can be used to close the opening to form the internal environment of the battery cell 200. Alternatively, the end cap 220 and the housing 210 can be integrated. Specifically, the end cap 220 and the housing 210 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 210, the end cap 220 closes the housing 210. The housing 210 can have various shapes and sizes, such as cuboid, cylindrical, or hexagonal prism. Specifically, the shape of the housing 210 can be determined according to the specific shape and size of the cell assembly 211. The shell 210 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.

[0080] The cell assembly 211 is the component in the battery cell 200 where the electrochemical reaction occurs. The casing 210 may contain one or more cell assemblies 211. The cell assembly 211 is mainly formed by stacking composite strips 400, which are formed by thermally bonding a positive electrode sheet, a negative electrode sheet, and a separator disposed between the positive and negative electrode sheets. The portions of the positive and negative electrode sheets containing active material constitute the main body of the cell assembly 211, 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 device 10, the positive and negative active materials react with the electrolyte, and the tabs connect to the electrode terminals 230 to form a current circuit.

[0081] Please refer to Figure 4 , Figure 4 The diagram shows a structural schematic of a battery cell according to some embodiments of this application. One battery cell 200 provided in this application includes a casing (not shown), a cell assembly (not shown), an end cap 220, electrode terminals 230, and an insulating film 240.

[0082] One end of the housing has an opening. The battery cell assembly can be inserted into the housing through the opening. The battery cell assembly is located inside the housing. The end cap 220 is connected to the housing and closes the opening to isolate the battery cell assembly from the external environment.

[0083] End cap 220 includes cap body 221 and a protrusion 222 connected to cap body 221, the protrusion 222 protruding from cap body 221 away from the interior of housing. Electrode terminal 230 is mounted on protrusion 222 and is at least partially located inside protrusion 222.

[0084] By housing the electrode terminal 230 through the protrusion 222 extending from the cover body 221, the space occupied by the electrode terminal 230 within the housing can be reduced, thus increasing the installation space for the battery cell assembly. If the end of the electrode terminal 230 facing inwards can be located within the protrusion 222, then the electrode terminal 230 will not occupy any space within the housing. Alternatively, if the end of the electrode terminal 230 facing inwards can also be located within the housing, then the electrode terminal 230 will partially occupy space within the housing, with the protrusion 222 accommodating a portion of the electrode terminal 230's structure.

[0085] The insulating film 240 includes a film body 241 and a flange 242 connected to the edge of the film body 241. The film body 241 covers the outer surface of the housing. The flange 242 is bent relative to the film body 241 toward the end cap 220 to cover the edge of the surface of the end cap 220 facing away from the interior of the housing. In the embodiments of this application, the flange 242 covers not only the outer surface of the cap body 221 of the end cap 220, but also the outer surface of the protrusion 222 of the end cap 220.

[0086] The membrane body 241 and the flange 242 can be an integral structure or a separate structure that is connected.

[0087] The membrane body 241 can surround the shell to cover the outer side of the shell, and the flange 242 bends inward from the edge of the end cap 112 to cover the outer surface of the end cap 112. The membrane body 241 can also cover the surface of the shell opposite to the end cap 112. The membrane body 241 can be a one-piece structure or it can be made of multiple membrane sheets spliced ​​together.

[0088] exist Figure 4 In the embodiment shown, the membrane body 241 is provided with flanges 242 at two opposite edges along the width direction of the flanges 242, and the two flanges 242 respectively cover the opposite edges of the surface of the end cap 112 on the side facing away from the inside of the housing.

[0089] Please refer to Figure 5 , Figure 5 It shows Figure 4 A partial enlarged view of region A. The flange 242 includes a first flange segment 2421 and a second flange segment 2422. The first flange segment 2421 covers the edge of the side surface of the cover body 221 facing away from the interior of the housing, and the second flange segment 2422 covers the edge of the side surface of the protrusion 222 facing away from the interior of the housing. The width w1 of the first flange segment 2421 is smaller than the width w2 of the second flange segment 2422.

[0090] The first flange segment 2421 and the second flange segment 2422 are arranged along the length of the flange portion 242. The position of the first flange segment 2421 corresponds to the position of the cover body 221, and the position of the second flange segment 2422 corresponds to the position of the protrusion 222. Therefore, after the flange portion 242 is bent relative to the membrane body 241 toward the end cap 220, the first flange segment 2421 covers the edge of the cover body 221 on the side surface facing away from the inside of the shell, and the second flange segment 2422 covers the edge of the protrusion 222 on the side surface facing away from the inside of the shell.

[0091] The aforementioned battery cell 200 has its electrode terminals 230 mounted on the protrusion 222. Since the second flange 2422 covers the edge of the protrusion 222 facing away from the interior of the housing, its width w2 is relatively large, thus maximizing the insulation protection around the electrode terminals 230. While ensuring insulation protection around the electrode terminals 230, the width w1 of the first flange 2421 can be relatively small, meaning the area covered by the first flange 2421 on the cover body 221 is smaller, and the area not covered by the flange 242 on the cover body 221 is relatively larger. Therefore, when the end cover 220 is bonded to the battery box or other components within the battery box, the bonding area of ​​the area not covered by the flange 242 on the cover body 221 is larger, thereby improving the bonding strength.

[0092] In some embodiments, the battery device includes a busbar component, through which the electrode terminals 230 of multiple battery cells 200 can be electrically connected to each other, enabling the multiple battery cells 200 to be connected in series, parallel, or in a mixed configuration. The busbar component can be a metal strip, made of materials such as copper, iron, aluminum, stainless steel, or aluminum alloy. Multiple battery cells 200 can be connected in series or parallel via the metal strip.

[0093] Since the electrode terminals 230 of the multiple battery cells 200 are electrically connected to each other through a busbar, and the electrode terminals 230 are mounted on the protrusion 222, the busbar connected to the electrode terminals 230 is also located near the protrusion 222. Other conductors connected to the electrode terminals, as mentioned above, are, for example, the busbar in this embodiment.

[0094] Please refer to Figure 5 In one embodiment, the bulge 222 includes a top wall 2221 and a side wall 2222. One end of the side wall 2222 is connected to the cover body 221 and protrudes from the cover body 221 toward the side facing away from the interior of the housing. The end of the side wall 2222 away from the cover body 221 is connected to the top wall 2221. Thus, a receiving space located outside the housing can be defined between the side wall 2222 and the top wall 2221 to receive the electrode terminal 230.

[0095] The flanged portion 242 also includes a transition flanged section 2423, one end of which is connected to the first flanged section 2421, and the other end of which is connected to the second flanged section 2422. The transition flanged section 2423 covers the edge of the outer surface of the side wall 2222, and the second flanged section 2422 covers the edge of the outer surface of the top wall 2221.

[0096] Along the length of the flanged portion 242, the first flanged section 2421, the transition flanged section 2423, and the second flanged section 2422 can be connected sequentially. These three components can be a single, integrated structure. Alternatively, any two of these components can be separate structures connected to each other.

[0097] The first flange section 2421 covers the surface of the cover body 221, the second flange section 2422 covers the edge of the outer surface of the top wall 2221, and the transition flange section 2423 covers the edge of the outer surface of the side wall 2222, thereby fully and completely covering the edge of the end cover 220 and achieving a good insulation and protection effect.

[0098] Please refer to Figure 5 In one embodiment, the width of the transition flange segment 2423 gradually increases from the end of the transition flange segment 2423 near the first flange segment 2421 to the end of the transition flange segment 2423 near the second flange segment 2422.

[0099] As the width of the transition flange section 2423 gradually increases, the side edge 2423a of the transition flange section 2423 away from the membrane body 241 can transition more smoothly, thereby making the structure of the flange portion 242 in the connection area between the first flange section 2421 and the second flange section 2422 more regular and less prone to damage.

[0100] In other embodiments, the width of the transition flange segment may also be uniform and constant, and equal to the width of the first flange segment. Alternatively, the width of the transition flange segment may be uniform and constant, and equal to the width of the second flange segment.

[0101] Please refer to Figure 5 In one embodiment, the end of the transition flange segment 2423 near the first flange segment 2421 has the same width as the first flange segment 2421, and the end of the transition flange segment 2423 near the second flange segment 2422 has the same width as the second flange segment 2422. Furthermore, from the end of the transition flange segment 2423 near the first flange segment 2421 to the end of the transition flange segment 2423 near the second flange segment 2422, the width of the transition flange segment 2423 continuously increases gradually.

[0102] Specifically, the width of the transition flange segment 2423 increases continuously and gradually, that is, the change in the width of the transition flange segment 2423 is continuous and gradually increases, rather than increasing in a stepwise manner. Since the width of the transition flange segment 2423 increases continuously from the end of the transition flange segment 2423 near the first flange segment 2421 to the end of the transition flange segment 2423 near the second flange segment 2422, the side edge 2423a of the transition flange segment 2423 on the side away from the membrane body 241 extends smoothly along the length direction of the transition flange segment 2423.

[0103] Since the width of the transition flange segment 2423 is equal to that of the first flange segment 2421 at the end near the first flange segment 2421, and the width of the transition flange segment 2423 is equal to that of the second flange segment 2422 at the end near the second flange segment 2422, the connection between the transition flange segment 2423 and the first flange segment 2421 is smooth, and the connection between the transition flange segment 2423 and the second flange segment 2422 is smooth. Furthermore, since the side edge 2423a of the transition flange section 2423 extends smoothly away from the membrane body 241 along the length direction of the transition flange section 2423, the side edge 2423a of the transition flange section 2423 away from the membrane body 241, the connection between the side edge 2423a and the first flange section 2421, and the connection between the side edge 2423a and the second flange section 2422 are all smooth transitions. As a result, the structure of the flange portion 242 in the connection area between the first flange section 2421 and the second flange section 2422 is relatively regular and not easily damaged.

[0104] Specifically, in Figure 5 In the illustrated embodiment, the connection between the top wall 2221 and the side wall 2222 is an arc transition, and the connection between the side wall 2222 and the cover body 221 is also an arc transition. Correspondingly, the two ends of the side edge 2423a of the transition flange section 2423 on the side away from the membrane body 241 extend in an arc shape. The middle part of the side edge 2423a of the transition flange section 2423 on the side away from the membrane body 241 extends in a straight line. Along the length direction of the transition flange section 2423, the side edge 2423a of the transition flange section 2423 on the side away from the membrane body 241 remains smoothly extended overall.

[0105] In other embodiments, the side 2423a of the transition flange segment 2423 on the side away from the membrane body 241 may also extend in a straight line as a whole, or in other extension forms, which will not be listed one by one.

[0106] Please combine Figures 6 to 8 , Figure 6 It shows Figure 4 The top view of the battery cell shown. Figure 7 It shows Figure 6 A sectional view of section BB. Figure 8 It shows Figure 7 A magnified view of a portion of region C.

[0107] In some embodiments, the first flange section 2421, the transition flange section 2423, and the second flange section 2422 are a continuous integral structure. The transition flange section 2423 is in a tensioned state, and there is a gap 2423b between the transition flange section 2423 and the sidewall 2222.

[0108] Specifically, since the first flange section 2421, the transition flange section 2423, and the second flange section 2422 are a continuous, integral structure, when the flange portion 242 bends inward from the edge of the end cap 220, the first flange section 2421 can smoothly adhere to the surface of the cap body 221, and the second flange section 2422 can smoothly adhere to the surface of the top wall 2221. However, when the transition flange section 2423 covers the side wall 2222, the dimension of the transition flange section 2423 along the length direction of the flange portion 242 is insufficient to allow the transition flange section 2423 to fully adhere to the side wall 2222. At this time, the transition flange section 2423 is in a taut state, and there is a gap 2423b between the transition flange section 2423 and the side wall 2222.

[0109] In this embodiment, the first flange section 2421, the transition flange section 2423, and the second flange section 2422 are a continuous integral structure. When the flange section 242 bends inward from the edge of the end cap 220, the first flange section 2421 and the second flange section 2422 can be flat and fitted, while the transition flange section 2423 is in a tensioned state and has a gap 2423b between it and the side wall 2222. This allows the entire flange section 242 to be covered in one go, thus simplifying the flange operation.

[0110] Please combine Figures 9 to 11 , Figure 9 A partial schematic diagram of a battery cell at the transition flange section of another embodiment is shown. Figure 10 A partial schematic diagram of a battery cell at the transition flange section is shown in yet another embodiment. Figure 11 A partial schematic diagram of a battery cell at the transition flange section is shown in another embodiment.

[0111] In some embodiments, the flange portion 242 is provided with a notch 2424, the notch 2424 extending from the side of the flange portion 242 away from the membrane body 241 toward the side closer to the membrane body 241. The notch 2424 has opposing first notch walls 2424a and second notch walls 2424b. Along the length direction of the flange portion 242, the arrangement direction of the first notch walls 2424a and the second notch walls 2424b is the same as the arrangement direction of the first flange segment 2421 and the second flange segment 2422.

[0112] The notch 2424 is located at any position between the first extreme position and the second extreme position, so that the transition flange section 2423 fits against the edge of the outer surface of the sidewall 2222. The first extreme position is where the notch 2424 is located on the first flange section 2421, and the distance d1 from the second notch wall 2424b to the transition flange section 2423 is 5mm. The second extreme position is where the notch 2424 is located on the second flange section 2422, and the distance d2 from the first notch wall 2424a to the transition flange section 2423 is 5mm.

[0113] In this embodiment, the position of the gap 2424 can be any position within the aforementioned position interval (i.e., between the first extreme position and the second extreme position). Furthermore, this position interval does not include the first extreme position and the second extreme position; it is an open interval. In other words, the first extreme position and the second extreme position mentioned in this embodiment are not actual locations where the gap 2424 can exist, but rather virtual positions defined by the two endpoints of the position interval for the convenience of describing the gap 2424.

[0114] When the notch 2424 is located at any position between the first and second extreme positions, the notch 2424 is located on the transition flange segment 2423 or near both ends of the transition flange segment 2423. Understandably, compared to... Figures 6 to 8 In the embodiment shown, after a notch 2424 is made in the aforementioned position interval on the flange portion 242, the notch 2424 can release the tension of the transition flange section 2423 and allow the transition flange section 2423 to fit against the side wall 2222, thereby enabling the transition flange section 2423 to fit against the edge of the outer surface of the side wall 2222. There can be no gap between the transition flange section 2423 and the outer surface of the side wall 2222, so that dirt is not easily trapped between the transition flange section 2423 and the side wall 2222 due to gaps.

[0115] Please refer to Figures 9 to 11 In one embodiment, the first notch wall 2424a and the second notch wall 2424b are arranged at an angle.

[0116] In the actual operation of creating the notch 2424, a slit can be cut in the aforementioned position range of the flange 242. This slit can release the tension of the transition flange 2423. Then, the transition flange 2423 is attached to the side wall 2222. At this time, the slit will open, and the two sides of the slit will form an angle, thus presenting a structure in which the first notch wall 2424a and the second notch wall 2424b are set at an angle.

[0117] This embodiment forms a notch 2424 structure in which the first notch wall 2424a and the second notch wall 2424b are set at an angle, which facilitates operation.

[0118] Understandably, the operation of making a slit in the aforementioned position range of the flange 242 can be performed either before the flange 242 is attached to the end cap 220 or after the flange 242 is attached to the end cap 220.

[0119] In other embodiments, the notch is not limited to being formed in the manner described above; for example, a portion of the material may be removed from the flange beforehand to form the notch.

[0120] Please refer to Figure 9In one embodiment, the first notch wall 2424a and the second notch wall 2424b are located in the transition flange section 2423.

[0121] In this embodiment, the first notch wall 2424a is located on the side of the second notch wall 2424b near the second flange section 2422, and the second notch wall 2424b is located on the side of the first notch wall 2424a near the first flange section 2421. All notches 2424 are located on the transition flange section 2423, therefore the first notch wall 2424a and the second notch wall 2424b are located on the transition flange section 2423. Therefore, the notches 2424 expose the edge of the outer surface of the sidewall 2222.

[0122] The notch 2424 is made at the position of this embodiment. The transition flange section 2423 is divided into two parts located on both sides of the notch 2424, which can better release the tension of the transition flange section 2423, so that the transition flange section 2423 can fit more closely to the side wall 2222.

[0123] Please refer to Figure 10 In one embodiment, the first notch wall 2424a and the second notch wall 2424b may also be located on the first flange section 2421. Figure 10 In the illustrated embodiment, the notch 2424 is entirely located on the first flange section 2421. The second notch wall 2424b is located on the side of the first notch wall 2424a near the transition flange section 2423. The notch 2424 exposes the edge of the outer surface of the cover body 221. Thus, the integrity of the transition flange section 2423 is better. In this embodiment, the distance (shortest distance) d1 from the second notch wall 2424b to the transition flange section 2423 is less than 5mm.

[0124] Please refer to Figure 11 In one embodiment, the first notch wall 2424a and the second notch wall 2424b may also be located on the second flange segment 2422. Figure 10 In the illustrated embodiment, the notch 2424 is entirely located on the second flange section 2422. The first notch wall 2424a is located on the side of the second notch wall 2424b near the transition flange section 2423. The notch 2424 exposes the edge of the outer surface of the top wall 2221. Thus, the integrity of the transition flange section 2423 is better. In this embodiment, the distance (shortest distance) d2 from the first notch wall 2424a to the transition flange section 2423 is less than 5mm.

[0125] In other embodiments, the notch may also be located at the connection between the transition flange section and the first flange section, i.e., at the connection between the notch and the side wall, with the first notch wall located in the first flange section and the second notch wall located in the transition flange section. Similarly, the notch may also be located at the connection between the transition flange section and the second flange section, i.e., at the connection between the notch and the side wall, with the first notch wall located in the transition flange section and the second notch wall located in the second flange section.

[0126] Please refer to Figure 12 In one embodiment, the battery cell 200 further includes an insulating patch 250, which is attached to the flange 242 and covers the notch 2424.

[0127] The connection between the insulating patch 250 and the flange 242 can be achieved by bonding.

[0128] By attaching the insulating patch 250 to the flange 242 and covering the gap 2424, insulation protection can be provided at the gap 2424.

[0129] Please refer to Figure 12 In one embodiment, the insulating patch 250 includes a first patch segment 251 and a second patch segment 252 connected to the first patch segment 251. The first patch segment 251 is attached to the membrane body 241, and the second patch segment 252 is bent relative to the first patch segment 251 toward the flange portion 242 and attached to the flange portion 242. The second patch segment 252 covers the notch 2424.

[0130] The first patch segment 251 and the second patch segment 252 can be an integral structure. In actual operation, the first patch segment 251 is first attached to the membrane body 241, and then the second patch segment 252 is bent towards the flange 242 so that the second patch segment 252 covers the notch 2424 and is attached to the flange 242. The second patch segment 252 and the flange 242 can be bonded together. The first patch segment 251 and the membrane body 241 can be bonded together.

[0131] In this embodiment, the insulating patch 250 includes a first patch segment 251 and a second patch segment 252, which makes the insulating patch 250 cover the gap 2424 more reliably and the insulating patch 250 less likely to separate from the gap 2424.

[0132] Please refer to Figure 12 In one embodiment, along the width direction of the flange 242, the insulating patch 250 protrudes from the flange 242 on the side away from the membrane body 241, and the protruding portion is attached to the end cap 220.

[0133] Specifically, the portion of the insulating patch 250 that protrudes from the flange 242 on the side away from the membrane body 241 can adhere to the non-flange area of ​​the end cap 220, thereby increasing the coverage area of ​​the insulating patch 250 and making the coverage of the notch 2424 more reliable. The insulating patch 250 is also less likely to detach from the notch 2424. The portion of the insulating patch 250 that protrudes from the flange 242 on the side away from the membrane body 241 can be bonded to the end cap 220.

[0134] Further, please refer to Figure 12 The first missing section 251 protrudes from the flange 242 on the side away from the membrane body 241, and the protruding part is attached to the end cap 220.

[0135] One embodiment of this application also provides a battery cell 200, including a housing, a cell assembly, an end cap 220, electrode terminals 230, and an insulating film 240. One end of the housing has an opening. The cell assembly is located inside the housing. The end cap 220 is connected to the housing and covers the opening. The end cap 220 includes a cap body 221 and a protrusion 222 connected to the cap body 221, the protrusion 222 protruding from the cap body 221 away from the interior of the housing. The electrode terminals 230 are mounted on the protrusion 222 and are at least partially located inside the protrusion 222. The insulating film 240 includes a film body 241 and a flanged portion 242 connected to the edge of the film body 241. The film body 241 covers the outer surface of the housing, and the flanged portion 242 is bent relative to the film body 241 toward the end cap 220 to cover the edge of the surface of the end cap 220 facing away from the interior of the housing. The flanged portion 242 includes a first flanged section 2421 and a second flanged section 2422. The first flange segment 2421 covers the edge of the side surface of the cover body 221 facing away from the interior of the housing, and the second flange segment 2422 covers the edge of the side surface of the protrusion 222 facing away from the interior of the housing. The width w1 of the first flange segment 2421 is smaller than the width w2 of the second flange segment 2422. The protrusion 222 includes a top wall 2221 and a side wall 2222. One end of the side wall 2222 is connected to the cover body 221 and protrudes from the cover body 221 towards the side facing away from the interior of the housing. The end of the side wall 2222 away from the cover body 221 is connected to the top wall 2221. The flange portion 242 also includes a transition flange segment 2423, one end of which is connected to the first flange segment 2421, and the other end of which is connected to the second flange segment 2422. The transition flange segment 2423 covers the edge of the outer surface of the sidewall 2222, and the second flange segment 2422 covers the edge of the outer surface of the top wall 2221. The end of the transition flange segment 2423 near the first flange segment 2421 has the same width as the first flange segment 2421, and the end of the transition flange segment 2423 near the second flange segment 2422 has the same width as the second flange segment 2422. Furthermore, from the end of the transition flange segment 2423 near the first flange segment 2421 to the end of the transition flange segment 2423 near the second flange segment 2422, the width of the transition flange segment 2423 continuously increases. The flange portion 242 is provided with a notch 2424, and the notch 2424 extends from the side of the flange portion 242 away from the membrane body 241 to the side near the membrane body 241. The notch 2424 has opposing first notch walls 2424a and second notch walls 2424b. The first notch wall 2424a and the second notch wall 2424b are located in the transition flange section 2423. The battery cell 200 also includes an insulating patch 250, which is attached to the flange 242 and covers the notch 2424.

[0136] In the aforementioned battery cell 200, because the second flanged section 2422 covers the edge of the side surface of the protrusion 222 facing away from the interior of the casing, the width w2 of the second flanged section 2422 is relatively large, thereby maximizing the insulation protection effect around the electrode terminal 230. While ensuring the insulation protection effect around the electrode terminal 230, the width w1 of the first flanged section 2421 can be relatively small, meaning the area on the cover body 221 covered by the first flanged section 2421 is smaller, and thus the area on the cover body 221 not covered by the flanged section 2422 is relatively larger. Therefore, when the end cover 220 is bonded to the battery box or other components within the battery box, the bonding area on the cover body 221 not covered by the flanged section 2422 is larger, thereby improving the bonding strength. The transition flange section 2423 has a smooth transition at the side 2423a away from the membrane body 241, at the connection between the side 2423a and the first flange section 2421, and at the connection between the side 2423a and the second flange section 2422. This makes the structure of the flange portion 242 in the connection area between the first flange section 2421 and the second flange section 2422 more regular and less prone to damage. By attaching the insulating patch 250 to the flange portion 242 and covering the gap 2424, the gap 2424 can be insulated and protected.

[0137] An embodiment of this application also provides a battery device 10, including a battery case 100 and a battery cell 200 of any of the above embodiments, wherein the battery cell 200 is located inside the battery case 100.

[0138] In the aforementioned battery device 10, the battery cell 200 and electrode terminal 230 are mounted on the protrusion 222. Since the second flange 2422 covers the edge of the side of the protrusion 222 facing away from the interior of the housing, the width w2 of the second flange 2422 is relatively large, thus ensuring adequate insulation around the electrode terminal 230. While ensuring insulation around the electrode terminal 230, the width w1 of the first flange 2421 can be relatively small, meaning the area covered by the first flange 2421 on the cover body 221 is smaller, and the area not covered by the flange 242 on the cover body 221 is relatively larger. Therefore, when the end cover 220 is bonded to the battery box or other components within the battery box, the bonding area of ​​the area not covered by the flange 242 on the cover body 221 is larger, thereby improving the bonding strength.

[0139] An embodiment of this application also provides an electrical device, including the battery device 10 in the above embodiment, the battery device 10 being used to provide electrical energy to the electrical device.

[0140] In the battery device 10 of the aforementioned electrical equipment, the electrode terminal 230 is mounted on the protrusion 222 in the battery cell 200. Since the second flange 2422 covers the edge of the side of the protrusion 222 facing away from the interior of the housing, the width w2 of the second flange 2422 is relatively large, thus ensuring the insulation protection effect around the electrode terminal 230 as much as possible. While ensuring the insulation protection effect around the electrode terminal 230, the width w1 of the first flange 2421 can be relatively small, meaning the area covered by the first flange 2421 on the cover body 221 is smaller, and the area not covered by the flange 242 on the cover body 221 is relatively larger. Therefore, when the end cover 220 is bonded to the battery box or other components inside the battery box, the bonding area of ​​the area not covered by the flange 242 on the cover body 221 is larger, thereby improving the bonding strength.

[0141] 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 (200), characterized in that, The battery cell (200) includes: A housing (210), one end of which is provided with an opening; End cap (220), the end cap (220) is connected to the housing (210) and covers the opening, the end cap (220) includes a cap body (221) and a protrusion (222) connected to the cap body (221), the protrusion (222) protruding out of the cap body (221) in a direction away from the interior of the housing (210). Electrode terminals (230) are mounted on the convex hull (222) and are at least partially located inside the convex hull (222); and An insulating film (240) includes a film body (241) and a flange (242) connected to the edge of the film body (241). The film body (241) covers the outer surface of the housing (210). The flange (242) includes a first flange section (2421) and a second flange section (2422). The first flange section (2421) covers the edge of the cover body (221) facing away from the interior of the housing (210), and the second flange section (2422) covers the edge of the protrusion (222) facing away from the interior of the housing (210). The width of the first flange section (2421) is smaller than the width of the second flange section (2422).

2. The battery cell (200) according to claim 1, characterized in that, The convex bulge (222) includes a top wall (2221) and a side wall (2222). One end of the side wall (2222) is connected to the cover body (221) and protrudes from the cover body (221) toward the side opposite to the interior of the housing (210). The end of the side wall (2222) away from the cover body (221) is connected to the top wall (2221). The flanged portion (242) includes a transition flanged section (2423), one end of which is connected to the first flanged section (2421), and the other end of which is connected to the second flanged section (2422); the transition flanged section (2423) covers the edge of the outer surface of the side wall (2222), and the second flanged section (2422) covers the edge of the outer surface of the top wall (2221).

3. The battery cell (200) according to claim 2, characterized in that, The width of the transition flange segment (2423) gradually increases from the end of the transition flange segment (2423) near the first flange segment (2421) to the end of the transition flange segment (2423) near the second flange segment (2422).

4. The battery cell (200) according to claim 3, characterized in that, The width of the transition flange segment (2423) near the first flange segment (2421) is equal to that of the first flange segment (2421), and the width of the transition flange segment (2423) near the second flange segment (2422) is equal to that of the second flange segment (2422). The width of the transition flange segment (2423) increases continuously from the end of the transition flange segment (2423) near the first flange segment (2421) to the end of the transition flange segment (2423) near the second flange segment (2422).

5. The battery cell (200) according to claim 2, characterized in that, The first flange section (2421), the transition flange section (2423) and the second flange section (2422) are a continuous integral structure.

6. The battery cell (200) according to claim 5, characterized in that, The transition flange section (2423) is in a tensioned state, and there is a gap (2423b) between the transition flange section (2423) and the side wall (2222).

7. The battery cell (200) according to claim 2, characterized in that, The flange portion (242) is provided with a notch (2424), and the notch (2424) extends from the side of the flange portion (242) away from the membrane body (241) to the side closer to the membrane body (241); the notch (2424) has opposing first notch walls (2424a) and second notch walls (2424b); along the length direction of the flange portion (242), the arrangement direction of the first notch walls (2424a) and the second notch walls (2424b) is the same as the arrangement direction of the first flange segment (2421) and the second flange segment (2422); The notch (2424) is located at any position between the first extreme position and the second extreme position, so that the transition flange (2423) fits against the edge of the outer surface of the sidewall (2222); Wherein, the first extreme position is: the notch (2424) is provided on the first flange section (2421), and the distance d1 from the second notch wall (2424b) to the transition flange section (2423) is 5mm; the second extreme position is: the notch (2424) is provided on the second flange section (2422), and the distance d2 from the first notch wall (2424a) to the transition flange section (2423) is 5mm.

8. The battery cell (200) according to claim 7, characterized in that, The first notch wall (2424a) and the second notch wall (2424b) are located in the transition flange section (2423).

9. The battery cell (200) according to claim 7, characterized in that, The first notch wall (2424a) and the second notch wall (2424b) are set at an angle.

10. The battery cell (200) according to claim 7, characterized in that, It also includes an insulating patch (250) that is attached to the flange (242) and covers the notch (2424).

11. The battery cell (200) according to claim 10, characterized in that, The insulating patch (250) includes a first patch segment (251) and a second patch segment (252) connected to the first patch segment (251). The first patch segment (251) is attached to the membrane body (241). The second patch segment (252) is bent relative to the first patch segment (251) toward the flange portion (242) and attached to the flange portion (242). The second patch segment covers the gap (2424).

12. The battery cell (200) according to claim 10, characterized in that, Along the width direction of the flange (242), the insulating patch (250) protrudes from the flange (242) on the side away from the membrane body (241).

13. A battery device (10), characterized in that, It includes a battery case (100) and a battery cell (200) according to any one of claims 1-12, wherein the battery cell (200) is located inside the battery case (100).

14. An electrical appliance, characterized in that, Includes the battery device (10) of claim 13, the battery device (10) being used to provide electrical energy to the electrical equipment.

Images