Battery monomer, battery device, energy storage device, energy storage system, power utilization device and charging network

Abstract

The utility model is applicable to the technical field of batteries, and provides a single battery, a battery device, an energy storage device, an energy storage system, a power utilization device and a charging network, the single battery comprises a shell, the shell comprises an end surface and a bottom surface which are oppositely arranged, the shell further comprises a side surface arranged around the peripheral side of the shell, and two ends of the side surface are respectively connected to the end surface and the bottom surface; the electrode terminal is arranged on the shell; an insulating film including a first portion connected to the side surface and a second portion connected to the first portion, the second portion bending in a direction in which the end surface is located; the end face is provided with a fixing structure connected with at least part of the second part. According to the battery monomer provided by the embodiment of the invention, the fixing structure is arranged on the end surface of the shell, and at least part of the second part is connected to the fixing structure, so that the stability of the second part connected to the end surface is improved through the fixing structure, the risk of tilting of the second part is reduced, and the connection stability and the insulation performance of the insulating film can be improved.

Description

Technical Field

[0001] This application belongs to the field of battery technology, and in particular relates to a battery cell, battery device, energy storage device, energy storage system, power consumption device and charging network. Background Technology

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of this sustainable development. For electric vehicles, battery technology is a crucial factor in their development.

[0003] The periphery of a battery cell is typically covered with an insulating film, and part of the insulating film is folded over and adhered to the end face of the battery cell. The insulating film is prone to lifting at the corners and edges of the end face, which can easily lead to a decrease in the insulating performance of the insulating film. Utility Model Content

[0004] In view of the above problems, this application provides a battery cell, battery device, energy storage device, energy storage system, power consumption device and charging network, which can alleviate the problem that the insulating film is prone to lifting on the end face of the battery cell.

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

[0006] The housing includes an end face and a bottom face disposed opposite to each other, and the housing also includes a side face disposed around the periphery of the housing, with the two ends of the side face respectively connected to the end face and the bottom face; an electrode terminal is disposed on the housing; an insulating film includes a first part and a second part connected to the first part, the first part being connected to the side face, and the second part being bent in the direction of the end face; a fixing structure for connecting at least a portion of the second part is provided on the end face.

[0007] In the technical solution of this embodiment, a fixing structure is provided on the end face of the shell, and at least part of the second part is connected to the fixing structure. The fixing structure improves the stability of the second part connected to the end face and reduces the risk of the second part lifting, thereby improving the connection stability and insulation performance of the insulating film.

[0008] In some embodiments, the surface roughness of the fixed structure is greater than the surface roughness of the end face.

[0009] In the technical solution of this embodiment, the surface roughness of the fixed structure is made greater than the surface roughness of the end face to increase the friction between the second part and the fixed structure, thereby increasing the resistance for the second part to detach from the fixed structure, making it difficult for the second part to detach from the fixed structure, and improving the connection stability of the second part.

[0010] In some embodiments, in a direction perpendicular to the end face, the projection of the second part is located within the end face, and the projection of the second part at least partially overlaps with the fixed structure.

[0011] The technical solution of this embodiment provides a positional relationship between a fixed structure, a second part, and an end face, such that the second part is located within the end face, and at least a portion of the projection of the second part overlaps with the fixed structure, so that the fixed structure can fix the second part, increase the resistance of the second part from detaching from the fixed structure, and reduce the risk of the second part warping.

[0012] In some embodiments, the fixing structure includes a plurality of connecting portions disposed on the end face, the plurality of connecting portions being spaced apart; at least a portion of the second portion is connected to the connecting portions, and at least a portion of the second portion is located in the gap between two adjacent connecting portions.

[0013] In this embodiment, the fixing structure includes multiple connecting parts, and the second part covers the connecting parts and is located between two adjacent connecting parts. This arrangement increases the contact area between the second part and the fixing structure, and improves the connection stability of the second part. At the same time, it also increases the friction between the second part and the fixing structure, increases the resistance of the second part from detaching from the fixing structure, and reduces the risk of the second part detaching from the fixing structure.

[0014] In some embodiments, the surface roughness of the connecting portion is greater than the surface roughness of the end face.

[0015] In the technical solution of this embodiment, the surface roughness of the connecting part is made greater than that of the end face to increase the friction between the second part and the connecting part, thereby further increasing the resistance of the second part to detach from the fixed structure, making it more difficult for the second part to detach from the fixed structure.

[0016] In some embodiments, the fixing structure includes a plurality of granular structures spaced apart on the end face.

[0017] In the technical solution of this embodiment, the connecting part includes a granular structure disposed on the end face, so as to increase the friction between the second part and the fixed structure through the granular structure, increase the resistance of the second part from detaching from the fixed structure, and reduce the risk of the second part from detaching from the fixed structure.

[0018] In some embodiments, the fixing structure includes an adhesive layer, one side of which is connected to the end face and the other side of which is connected to the second part.

[0019] In the technical solution of this embodiment, the fixing structure includes an adhesive layer to provide connection stability between the second part and the end face, thereby reducing the risk of the second part lifting or detaching.

[0020] In some embodiments, the fixing structure is located at the edge of the end face and is disposed around the end face.

[0021] In the technical solution of this embodiment, since the second part needs to be pasted at least at the edge where the end face and the side face intersect, the fixing structure is set at the edge of the end face to facilitate connection with the second part; the fixing structure is set around the end face so that the fixing structure and the second part can have a larger connection area, thereby enabling the second part to be more stably connected with the fixing structure.

[0022] In some embodiments, the fixing structure is located at the corner of the end face; and / or, the fixing structure is located at the center of the edge of the end face.

[0023] In the technical solution of this embodiment, the fixing structure is set at the corner of the end face, and / or the fixing structure is set at the middle of the edge where the end face and the side face intersect, so as to specifically improve the connection stability of the part that is prone to warping or detachment, thereby reducing the risk of warping or detachment of the second part.

[0024] In some embodiments, the electrode terminals are disposed on the end face, and on the same projection plane parallel to the end face, the orthographic projection of the electrode terminals and the orthographic projection of the second part are alternately arranged.

[0025] In the technical solution of this embodiment, the orthographic projection of the electrode assembly and the orthographic projection of the second part are staggered to reduce the interference that the second part may cause to the transmission of electrical energy to the electrode terminals.

[0026] In some embodiments, the battery cell further includes a pressure relief structure disposed on the end face; on the same projection plane parallel to the end face, the orthographic projection of the pressure relief structure and the orthographic projection of the second part are staggered.

[0027] In the technical solution of this embodiment, the orthographic projection of the pressure relief structure and the orthographic projection of the second part are staggered to reduce the interference of the second part on the release of flue gas by the pressure relief structure.

[0028] In some embodiments, the shell is prismatic in shape.

[0029] In the technical solution of this embodiment, the shape of the shell can be prismatic, that is, the battery cell can be a square battery cell. Since the insulating film of the square battery cell is more likely to lift up at the end face, this setting can reduce the risk of the insulating film lifting up in the square battery cell.

[0030] Secondly, some embodiments of this application also provide a battery device, including the battery cell provided in some embodiments of the first aspect.

[0031] Thirdly, some embodiments of this application also provide an energy storage device, including a battery cell provided in some embodiments of the first aspect, or a battery device provided in some embodiments of the second aspect; the battery cell is used to store or provide electrical energy.

[0032] Fourthly, some embodiments of this application also provide an energy storage system, including an energy storage device and a power conversion device provided in some embodiments of the third aspect, wherein the power conversion device is used to electrically connect the power generation device and the energy storage device.

[0033] Fifthly, some embodiments of this application also provide an electrical device, including a battery cell provided in some embodiments of the first aspect, a battery device provided in some embodiments of the second aspect, an energy storage device provided in some embodiments of the third aspect, or an energy storage system provided in some embodiments of the fourth aspect, wherein the battery cell is used to store or provide electrical energy.

[0034] In a sixth aspect, some embodiments of this application also provide a charging network, including a charging pile and an energy storage device provided in some embodiments of the third aspect, or an energy storage system provided in some embodiments of the fourth aspect; the energy storage device is used to provide electrical energy to the charging pile.

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

[0036] 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:

[0037] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0038] Figure 2 This is an exploded view of the battery device provided in some embodiments of this application;

[0039] Figure 3 This is an exploded structural diagram of a battery cell provided in some embodiments of this application;

[0040] Figure 4 An exploded structural diagram of a battery cell with an insulating film provided in some embodiments of this application;

[0041] Figure 5 A three-dimensional schematic diagram of a battery cell with an insulating film provided in some embodiments of this application;

[0042] Figure 6 A top view schematic diagram of a battery cell with an insulating film provided for some embodiments of this application;

[0043] Figure 7 This is a top view of a battery cell after the insulating film has been removed, provided in some embodiments of this application;

[0044] Figure 8 This is a top view of a battery cell after the insulating film has been removed, provided in some other embodiments of this application;

[0045] Figure 9 For some embodiments of this application Figure 7 A magnified view of a portion of point A in the middle;

[0046] Figure 10 For other embodiments of this application Figure 7 A magnified view of a portion of point A in the middle;

[0047] Figure 11 This application provides schematic diagrams of the structure of an energy storage system according to some embodiments.

[0048] Figure 12 This is a schematic diagram of the structure of a charging network provided in some embodiments of this application.

[0049] The markings in the diagram mean:

[0050] 1. Energy storage devices; 2. Power conversion devices; 3. Power generation devices; 4. Charging piles; 5. Connectors;

[0051] 1000, vehicles;

[0052] 100. Battery device;

[0053] 10. Box; 11. First box; 12. Second box;

[0054] 20. Battery cell; 21. Housing; 211. End cap; 2111. End face; 212. Housing body; 2121. Side; 2122. Bottom; 213. Fixing structure; 2131. Connecting part; 22. Electrode terminal; 23. Pressure relief structure; 24. Electrode assembly; 25. Insulating film; 251. First part; 252. Second part;

[0055] 200. Motor;

[0056] 300. Controller. 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 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.

[0066] The casing of a battery cell is usually covered with an insulating film to reduce damage to the battery cell that may be caused by the environment (such as water, dust, chemicals, etc.) or structures outside the battery cell. The insulating film mainly covers the bottom and sides of the battery cell. In order to better cover the sides of the casing, part of the insulating film is usually extended beyond the sides and folded over and pasted onto the end cap.

[0067] In such battery cells, the insulating film tends to overlap at the corners of the end cap, causing it to easily lift up at the corners of the end face. Simultaneously, the insulating film also tends to lift up in the middle of the end cap edge. This lifting of the insulating film can create gaps between the insulating film and the end cap, and as the battery cell sits, these gaps easily widen, leading to a decrease in the adhesive performance of the insulating film. Furthermore, water, dust, and other impurities can easily enter through these gaps, causing insulation failure in the battery cell.

[0068] Based on the above considerations, in order to alleviate the problem of the insulating film easily lifting off the end face of the battery cell, this application provides a battery cell with a fixing structure on the end cap, and at least a portion of the second part of the insulating film is connected to the fixing structure. In such a battery cell, the fixing structure improves the connection stability between the second part and the end face, reduces the risk of the second part lifting off, and improves the connection stability of the insulating film, thereby indirectly improving the insulation performance of the insulating film.

[0069] The battery cells disclosed in this application can be used in electrical devices that use batteries as a power source or in various energy storage systems that use batteries as energy storage elements. Electrical devices can be, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0070] For ease of explanation, the following embodiments will be described using a vehicle 1000 as an example of an electrical device according to an embodiment of this application.

[0071] refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery is installed inside the vehicle 1000, and the battery can be located at the bottom, front, or rear of the vehicle 1000. The battery can be used to power the vehicle 1000; for example, the battery can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 300 and a motor 200. The controller 300 is used to control the battery to supply power to the motor 200, for example, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

[0072] In some embodiments of this application, the battery can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0073] refer to Figure 2 , Figure 2 This is an exploded structural diagram of a battery device 100 provided in some embodiments of this application.

[0074] The battery device 100 mentioned in the embodiments of this application may include one or more battery assemblies for providing voltage and capacity. The battery assembly may include multiple battery cells 20, which are connected in series, parallel, or mixed connection via a busbar.

[0075] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells 20.

[0076] As an example, the battery assembly can be a battery module, which consists of multiple battery cells 20 arranged and fixed together to form an independent module. As an example, a battery module can also be formed by bundling multiple battery cells 20 together with cable ties.

[0077] In some embodiments, the battery assembly may be a battery pack, which includes a housing 10 and one or more battery assemblies housed within the housing 10.

[0078] As an example, the battery assembly can be a battery module, which can be housed in the housing 10 by fixing the battery module in the housing 10.

[0079] As an example, the battery assembly can also be housed in the housing 10 by directly fixing multiple battery cells 20 to the housing 10.

[0080] As an example, the housing 10 may include a first housing 11 and a second housing 12. The first housing 11 and the second housing 12 are fastened together to form a closed space inside the housing 10 for housing the battery assembly. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first housing 11 may be a top cover or a bottom plate.

[0081] As an example, the housing 10 may include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that the interior of the housing 10 forms an enclosed space to house the battery assembly.

[0082] In some embodiments, the housing 10 may be part of the chassis structure of the vehicle 1000. For example, a portion of the housing 10 may be at least a portion of the floor of the vehicle 1000, or a portion of the housing 10 may be at least a portion of the crossbeams and longitudinal beams of the vehicle 1000.

[0083] refer to Figure 3 , Figure 3 This is an exploded structural diagram of a battery cell 20 provided in some embodiments of this application. A battery cell 20 refers to the smallest unit that makes up a battery. As shown, the battery cell 20 includes a housing 21, an electrode assembly 24, and other functional components; the housing 21 includes a housing body 212 and an end cap 211.

[0084] End cap 211 refers to a component that covers the opening of the housing body 212 to isolate the internal environment of the battery cell 20 from the external environment. The shape of end cap 211 can be adapted to the shape of the housing body 212 to fit it. Optionally, end cap 211 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that end cap 211 is not easily deformed under pressure and impact, allowing the battery cell 20 to have higher structural strength and improved safety performance. Functional components such as electrode terminals 22 can be provided on end cap 211. Electrode terminals 22 can be used for electrical connection with electrode assembly 24 for outputting or inputting electrical energy into the battery cell 20. In some embodiments, end cap 211 can also be provided with a pressure relief structure 23 for releasing internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold. The material of end cap 211 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose any special limitations on this. In some embodiments, an insulating element may be provided on the inner side of the end cap 211. The insulating element can be used to isolate the electrical connection components within the housing body 212 from the end cap 211 to reduce the risk of short circuits. For example, the insulating element may be made of plastic, rubber, etc.

[0085] The housing body 212 is an assembly used to cooperate with the end cap 211 to form the internal environment of the battery cell 20. This internal environment can accommodate the electrode assembly 24, electrolyte, and other components. The housing body 212 and the end cap 211 can be independent components. An opening can be provided on the housing body 212, and the end cap 211 can be used to close the opening to form the internal environment of the battery cell 20. Alternatively, the end cap 211 and the housing body 212 can be integrated. Specifically, the end cap 211 and the housing body 212 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 body 212, the end cap 211 closes the housing body 212. The housing body 212 can have various shapes and sizes, such as cuboid, cylindrical, or hexagonal prism. Specifically, the shape of the housing body 212 can be determined according to the specific shape and size of the electrode assembly 24. The material of the shell body 212 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. This application embodiment does not impose any special restrictions on this.

[0086] Electrode assembly 24 is the component in the battery cell 20 where electrochemical reactions occur. The casing 21 may contain one or more electrode assemblies 24. Electrode assembly 24 is mainly formed by winding or stacking positive and negative electrode sheets, and typically a separator is provided between the positive and negative electrode sheets. The portions of the positive and negative electrode sheets containing active material constitute the main body of the electrode assembly 24, 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 22 to form a current loop.

[0087] refer to Figures 4 to 6 In one aspect, some embodiments of this application provide a battery cell 20, including a housing 21, electrode terminals 22 and an insulating film 25.

[0088] The housing 21 includes an end face 2111 and a bottom face 2122 disposed opposite to each other. The housing 21 also includes a side face 2121 disposed around the periphery of the housing 21, with the two ends of the side face 2121 respectively connected to the end face 2111 and the bottom face 2122. The electrode terminal 22 is disposed on the housing 21. The insulating film 25 includes a first part 251 and a second part 252 connected to the first part 251. The first part 251 is connected to the side face 2121, and the second part 252 is bent in the direction of the end face 2111. The end face 2111 is provided with a fixing structure 213 that connects at least part of the second part 252.

[0089] The battery cell 20 includes a housing 21, on which electrode terminals 22 are provided. The housing 21 can be a prismatic structure, a cylindrical structure, or other shapes. For example, the housing 21 can be a cuboid structure, in which case the battery cell 20 is a prismatic battery cell; for example, the housing 21 can also be a cylindrical structure, in which case the battery cell 20 is a cylindrical battery cell.

[0090] The housing 21 includes a bottom surface 2122 and an end surface 2111 disposed opposite to each other. The electrode assembly 24 is located between the end surface 2111 and the bottom surface 2122. The electrode terminal 22 may be located on the end surface 2111, the bottom surface 2122, or other locations on the housing 21. When the housing 21 includes an end cap 211, the end surface 2111 may be the surface of the end cap 211 facing away from the battery cell 20. When the housing 21 includes a housing body 212, the bottom surface 2122 may be the surface opposite to the end cap 211 and facing away from the battery cell 20.

[0091] The housing 21 also includes side surfaces 2121, which are the surfaces surrounding the housing 21. Each side surface 2121 is arranged around the periphery of the housing 21, and both ends of each side surface 2121 are connected to the end surface 2111 and the bottom surface 2122, respectively, thereby forming the outer surface of the housing 21. Depending on the shape of the housing 21, the side surface 2121 can be a plane or an arcuate surface; for example, when the housing 21 has a prismatic structure, the side surface 2121 can be a plane; when the housing 21 has a cylindrical structure, the side surface 2121 can be an arcuate surface.

[0092] The fixing structure 213 refers to the structure provided on the end face 2111 of the housing 21. The fixing structure 213 is used to fix part of the insulating film 25 on the end face 2111 to improve the connection stability of the part where the insulating film 25 is connected to the end face 2111.

[0093] The fixing structure 213 may include an adhesive structure to improve the adhesion between the insulating film 25 and the fixing structure 213. The fixing structure 213 may also include a friction texture structure to increase the resistance to mutual movement between the insulating film 25 and the fixing structure 213, making it more difficult for the insulating film 25 to detach from the fixing structure 213. The fixing structure 213 may also include an uneven structure to increase the connection area between the insulating film 25 and the fixing structure 213, thereby improving the connection stability of the insulating film 25. It is understood that the fixing structure 213 may also include other structures that improve the connection stability of the insulating film 25 (such as snaps, etc.), and is not limited to the above three types.

[0094] The number of fixing structures 213 can be one, two or more; the fixing connection can be an independent structure and connected to the end face 2111 by means of bonding, welding or other methods. The fixing structure 213 can also be integrally formed with the end cover 211.

[0095] The insulating film 25 refers to the film structure covering the surface of the housing 21 facing away from the battery cell 20. The insulating film 25 is used to protect the battery cell 20 and block impurities (water, dust, chemicals, etc.) in the external environment from causing damage to the battery cell 20. At the same time, in the event of a short circuit or leakage in the battery cell 20, the insulating film 25 can also prevent it from causing damage to other battery cells 20.

[0096] Both the first part 251 and the second part 252 are portions of the insulating film 25, with the first part 251 connected to the second part 252. The first part 251 refers to the portion of the insulating film 25 that corresponds to and covers the side 2121. The first part 251 is connected to the side 2121 to protect the side 2121. The first part 251 can be glued to the corresponding side 2121 or connected to the side 2121 in other ways.

[0097] The second part 252 refers to the portion of the insulating film 25 that extends in the direction of the end face 2111 and beyond the side face 2121; the fixing structure 213 is connected to at least a portion of the second part 252, that is, the second part 252 can be completely connected to the fixing structure 213, or the second part 252 can be only partially connected to the fixing structure 213, in which case the remaining portion of the second part 252 can be connected to the end face 2111.

[0098] Since the end face 2111 and the side face 2121 are not on the same plane and are not parallel, and the fixing structure 213 is located on the end face 2111, the second part 252 needs to be bent in the direction of the end face 2111 so that the second part 252 can be connected to the fixing structure 213.

[0099] For example, based on the area and position of the end face 2111 covered by the second part 252, the fixing structure 213 can be set correspondingly to the second part 252 so that each part of the second part 252 can be connected to the fixing structure 213, so that the fixing structure 213 can fix the second part 252 more stably; for example, the fixing structure 213 can also be arranged only for the parts of the second part 252 that are prone to warping, so as to improve the connection stability of the parts of the second part 252 that are prone to warping, in which case the other parts of the second part 252 are connected to the end face 2111.

[0100] It is understandable that, in addition to the first part 251 and the second part 252, the insulating film 25 may also include other parts, such as the part that corresponds to and covers the bottom surface 2122.

[0101] In this embodiment, a fixing structure 213 is provided on the end face 2111 of the housing 21, and at least a portion of the second part 252 is connected to the fixing structure 213. The fixing structure 213 improves the stability of the second part 252 connected to the end face 2111 and reduces the risk of the second part 252 lifting, thereby improving the connection stability and insulation performance of the insulating film 25.

[0102] In some embodiments, the surface roughness of the fixing structure 213 is greater than the surface roughness of the end face 2111.

[0103] The surface of the fixing structure 213 is the surface of the fixing structure 213 facing the outside, and it is also the surface on which the second part 252 is connected to the fixing structure 213. The surface roughness of the fixing structure 213 is greater than the surface roughness of the end face 2111, so that the friction between the second part 252 and the fixing structure 213 is greater than the friction between the second part 252 and the end face 2111. Compared with the friction between the second part 252 and the end face 2111, this arrangement can increase the resistance of the second part 252 to detach from the fixing structure 213, thereby improving the stability of the connection between the second part 252 and the fixing structure 213.

[0104] Since the second part 252 is usually connected to the end face 2111, and the second part 252 is easy to lift off the end face 2111, the surface roughness of the fixing structure 213 is made greater than the surface roughness of the end face 2111, so as to increase the difficulty of the second part 252 detaching from the fixing structure 213, thereby reducing the risk of the second part 252 lifting off.

[0105] Understandably, the greater the surface roughness of the fixed structure 213, the greater the resistance to the second part 252 detaching from the fixed structure 213. Accordingly, friction textures can be provided on the surface of the fixed structure 213, or the surface of the fixed structure 213 can be sanded, or other structures that can improve friction can be provided on the surface of the fixed structure 213 to reduce the risk of the second part 252 lifting up.

[0106] The surface roughness of fixed structure 213 and end face 2111 can be measured using methods such as the stylus method, the impression method, and the electric profilometer method. The stylus method involves placing a stylus vertically on the surface being measured and moving it; the stylus will move vertically up and down following the contour of the surface being measured. This displacement activity can be converted into an electrical signal through a circuit, and the surface roughness index can be obtained by analyzing these electrical signals. The electric profilometer method uses a sensor to crawl on the surface being measured, and the arithmetic mean deviation (Ra) of the workpiece contour is calculated.

[0107] In this embodiment, the surface roughness of the fixed structure 213 is made greater than the surface roughness of the end face 2111 to increase the friction between the second part 252 and the fixed structure 213, thereby increasing the resistance for the second part 252 to detach from the fixed structure 213, making it difficult for the second part 252 to detach from the fixed structure 213, and improving the connection stability of the second part 252.

[0108] refer to Figures 4 to 8 In some embodiments, the projection of the second part 252 is located within the end face 2111 in a direction perpendicular to the end face 2111, and the projection of the second part 252 at least partially overlaps with the fixed structure 213.

[0109] The projection of the second part 252 in the direction perpendicular to the end face 2111 reflects the positional relationship between the second part 252 and the end face 2111. The projection of the second part 252 is located inside the end face 2111, that is, the second part 252 can fall on the end face 2111 after bending relative to the first part 251.

[0110] The projection of the second part 252 in the direction perpendicular to the end face 2111 also reflects the positional relationship between the second part 252 and the fixed structure 213. The projection of the second part 252 overlaps with the fixed structure 213 at least partially.

[0111] The projection of the second part 252 can completely overlap with the fixed structure 213. At this time, the second part 252 is only connected to the fixed structure 213, and each part of the second part 252 can be better connected to the end face 2111 through the fixed structure 213.

[0112] The projection of the second part 252 can also partially overlap with the fixed structure 213. In this case, in addition to being connected to the fixed structure 213, the second part 252 is also connected to the end face 2111. The second part 252 is only partially connected to the end face 2111 through the fixed structure 213. The fixed structure 213 only improves the connection stability between the second part 252 and the end face 2111 for a part of the second part 252.

[0113] This embodiment provides a positional relationship between the fixing structure 213, the second part 252, and the end face 2111, such that the second part 252 is located within the end face 2111, and at least a portion of the projection of the second part 252 overlaps with the fixing structure 213, so that the fixing structure 213 can fix the second part 252, thereby increasing the resistance of the second part 252 to detach from the fixing structure 213 and reducing the risk of the second part 252 tilting.

[0114] refer to Figures 7 to 10 In some embodiments, the fixing structure 213 includes a plurality of connecting portions 2131 disposed on the end face 2111, the plurality of connecting portions 2131 being spaced apart; at least a portion of the second portion 252 is connected to the connecting portion 2131, and at least a portion of the second portion 252 is located in the gap between two adjacent connecting portions 2131.

[0115] The connecting part 2131 refers to the structure provided on the end face 2111. The connecting part 2131 can form an uneven surface on the end face 2111 to improve the friction. The connecting part 2131 can be a structure that protrudes from the end face 2111 in a direction away from the end cover 211. The connecting part 2131 can also be formed by slotting on the end face 2111, that is, a connecting part 2131 can be formed between two adjacent slots.

[0116] The connecting part 2131 can be a cylindrical structure, a strip structure, or other shapes. The connecting part 2131 is disposed on the end face 2111 of the end cap 211. The connecting part 2131 can also be an independent component and connected to the end cap 211 by welding, bonding, or other methods. The connecting part 2131 can also be integrally formed with the end cap 211. When the connecting part 2131 is a strip structure, the connecting part 2131 can be prismatic, semi-cylindrical, or other shapes. The connecting part 2131 can be a straight strip structure or a curved strip structure extending along a reference straight line. The material of the connecting part 2131 can include metal, plastic, or other materials. The material of the connecting part 2131 can be the same as or different from the material of the end cap 211.

[0117] The number of connecting parts 2131 can be two, three or more; multiple connecting parts 2131 are arranged at intervals. In this case, the fixing structure 213 can include the gap between the connecting parts 2131 and adjacent connecting parts 2131, and can form an uneven surface on the end face 2111, thereby increasing the friction of the second part 252 at the fixing structure 213 and increasing the resistance of the second part 252 to detach from the fixing structure 213.

[0118] For example, the connecting part 2131 can be a strip structure, and the connecting part 2131 is formed by providing a strip groove on the end face 2111; for example, multiple strip grooves can be provided at intervals on the end face 2111, and a connecting part 2131 can be formed between two adjacent strip grooves. Multiple connecting parts 2131 can form a friction texture structure on the end face 2111; at this time, the fixing structure 213 can be formed by processing a part of the end cover 211.

[0119] At least a portion of the second part 252 is connected to the connecting part 2131, and at least a portion of the second part 252 is located in the gap between two adjacent connecting parts 2131, that is, the second part 252 can cover the externally facing surfaces of the connecting part 2131. This arrangement increases the contact area between the second part 252 and the fixing structure 213, improves the connection stability between the second part 252 and the fixing structure 213, and can also alleviate the problem of partial warping caused by the length of the second part 252, thereby further improving the connection stability of the second part 252.

[0120] In this embodiment, the fixing structure 213 includes multiple connecting portions 2131, and the second portion 252 covers the connecting portions 2131 and is located between two adjacent connecting portions 2131. This arrangement increases the contact area between the second portion 252 and the fixing structure 213, improving the connection stability of the second portion 252. At the same time, it also increases the friction between the second portion 252 and the fixing structure 213, increasing the resistance of the second portion 252 to detach from the fixing structure 213 and reducing the risk of the second portion 252 detaching from the fixing structure 213.

[0121] In some embodiments, the surface roughness of the connecting portion 2131 is greater than the surface roughness of the end face 2111.

[0122] Since the second part 252 is connected to the outer surface of the connecting part 2131, the surface roughness of the connecting part 2131 is greater than the surface roughness of the end face 2111, which can further increase the resistance of the second part 252 to detach from the fixed structure 213, thereby reducing the risk of the second part 252 detaching.

[0123] Friction textures can be provided on the connecting part 2131, or the surface of the connecting part 2131 can be sanded, or other structures that can improve friction can be provided on the surface of the connecting part 2131 to improve the surface roughness of the connecting part 2131 and increase the resistance of the second part 252 to detach from the connecting part 2131.

[0124] In this embodiment, the surface roughness of the connecting part 2131 is made greater than the surface roughness of the end face 2111 to increase the friction between the second part 252 and the connecting part 2131, thereby further increasing the resistance of the second part 252 to detach from the fixed structure 213, making it more difficult for the second part 252 to detach from the fixed structure 213.

[0125] refer to Figure 7 , Figure 10 In some embodiments, the fixing structure 213 includes a plurality of granular structures spaced apart on the end face 2111.

[0126] The granular structure refers to a small-volume structure formed on the end face 2111. The granular structure can be a cylindrical structure, or a prismatic, hemispherical or other shaped structure. The granular structure can also be an irregularly shaped structure. For example, the granular structure can be a microstructure densely distributed on the end face 2111. In this case, the granular structure can be formed by frosting the end face 2111 of the end cap 211.

[0127] There are multiple granular structures, and the multiple granular structures are spaced apart to form an uneven plane on the end face 2111; when the second part 252 is connected to the fixed structure 213, this arrangement can increase the friction between the second part 252 and the fixed structure 213, and can increase the resistance of the second part 252 to detach from the fixed structure 213, thereby reducing the risk of the second part 252 lifting up.

[0128] In this embodiment, the connecting part 2131 includes a granular structure disposed on the end face 2111, so as to increase the friction between the second part 252 and the fixed structure 213 through the granular structure, increase the resistance of the second part 252 to detach from the fixed structure 213, and reduce the risk of the second part 252 detaching from the fixed structure 213.

[0129] In some embodiments, the fixing structure 213 includes an adhesive layer, one side of which is connected to the end face 2111, and the other side of which is connected to the second part 252.

[0130] The adhesive layer refers to the structure set between the end face 2111 and the second part 252. The adhesive layer can be set on the end face 2111 first and connected to the second part 252 after the second part 252 is bent. Alternatively, the adhesive layer can be set on the second part 252 first and connected to the end face 2111 after the second part 252 is bent.

[0131] The adhesive layer has a circular layered structure, but it can also be polygonal or other shapes; the material of the adhesive layer can include resin, rubber, silicone and other materials.

[0132] After the second part 252 is connected to the fixed structure 213, the side of the adhesive layer facing the end face 2111 is connected to the end face 2111, and the side of the adhesive layer facing the second part 252 is connected to the second part 252. The second part 252 can be completely connected to the adhesive layer, in which case the second part 252 is only connected to the adhesive layer, so as to be indirectly connected to the end face 2111 through the adhesive layer. Alternatively, the second part 252 can be only partially connected to the adhesive layer, and the other part of the second part 252 can be directly connected to the end face 2111.

[0133] The fixing structure 213 may include only the adhesive layer, or it may include other structures, such as the connecting part 2131, the particle structure, etc. When the fixing structure 213 includes the adhesive layer and the connecting part 2131, the adhesive layer and the connecting part 2131 may be respectively provided at different positions on the end face 2111. The adhesive layer may also be stacked with the connecting part 2131, that is, the adhesive layer may also be provided on the connecting part 2131 to connect the second part 252 to the connecting part 2131.

[0134] In this embodiment, the fixing structure 213 includes an adhesive layer to provide connection stability between the second part 252 and the end face 2111, thereby reducing the risk of the second part 252 lifting or detaching.

[0135] refer to Figure 8 In some embodiments, the fixing structure 213 is located at the edge of the end face 2111 and is disposed around the end face 2111.

[0136] The edge of end face 2111 refers to the part where end face 2111 is connected to each side face 2121; the fixing structure 213 is located at the edge of end face 2111. Since the first part 251 is connected to the side face 2121 and the second part 252 is connected to the first part 251 and the end face 2111, the second part 252 will be at least opposite to the edge of end face 2111. Accordingly, the fixing structure 213 is located at the edge of end face 2111 so that the second part 252 can be connected to the fixing structure 213 and so that the second part 252 can cover a larger area of ​​the fixing structure 213.

[0137] The fixing structure 213 is provided around the end face 2111; for example, when the end face 2111 is a rectangular surface, the fixing structure 213 forms a square ring structure around the edge of the end face 2111, and when the end face 2111 is a circular surface, the fixing structure 213 forms a circular ring structure around the edge of the end face 2111.

[0138] Since each side 2121 is located on the periphery of the housing 21, that is, each side 2121 surrounds the end face 2111, the fixing structure 213 is arranged around the end face 2111 so that the second part 252 extending from each side 2121 to the end face 2111 can be connected to the fixing structure 213. That is, the fixing structure 213 can be opposite to the second part 252 extending from each side 2121 to the end face 2111, so as to more comprehensively fix the second part 252 at each position, thereby better reducing the risk of the second part 252 lifting up.

[0139] Since the second part 252 needs to be pasted at least at the edge where the end face 2111 and the side face 2121 intersect, the fixing structure 213 is set at the edge of the end face 2111 in this embodiment so as to connect with the second part 252. In this embodiment, the fixing structure 213 is also arranged around the end face 2111 so that the fixing structure 213 and the second part 252 can have a larger connection area, so that the second part 252 can be more stably connected with the fixing structure 213.

[0140] refer to Figure 7 In some embodiments, the fixing structure 213 is located at the corner of the end face 2111; and / or, the fixing structure 213 is located at the middle of the edge of the end face 2111.

[0141] The corner of end face 2111 refers to the intersection of two adjacent edges of end face 2111, and the middle of the edge of end face 2111 refers to the position where the edge is close to the two adjacent edges; the fixing structure 213 can be provided only at the corner of end face 2111 or at the middle of the edge, or the fixing structure 213 can be provided at both the corner of end face 2111 and the middle of the edge.

[0142] Because the second part 252 requires a larger coverage area at the corners of the end face 2111 than the corresponding area of ​​the end face 2111 during the bending process, the second part 252 is prone to overlapping at the corners of the end face 2111, which can easily cause the second part 252 to warp. Therefore, a fixing structure 213 is provided at the corners of the end face 2111 to increase the connection area between the second part 252 and the fixing structure 213, thereby reducing the overlapping area of ​​the second part 252. Simultaneously, this arrangement also increases the resistance to the second part 252 detaching from the fixing structure 213, thus reducing the risk of the second part 252 warping.

[0143] Because the area required to cover the corner of the second part 252 towards the end face 2111 is larger than the area of ​​the corresponding part of the end face 2111, that is, the length of the part of the second part 252 corresponding to the edge is greater than the length of the corresponding edge, it is easy for the part of the second part 252 corresponding to the middle of the edge to bulge. Accordingly, a fixing structure 213 is provided in the middle of the edge of the end face 2111 to increase the connection area between the second part 252 and the fixing structure 213, thereby alleviating the problem of bulging caused by the length of the second part 252 being greater than the edge length; at the same time, this setting can also increase the resistance of the second part 252 to detach from the fixing structure 213, thereby reducing the risk of the second part 252 warping.

[0144] In this embodiment, the fixing structure 213 is set at the corner of the end face 2111, and the fixing structure is set at the middle of the edge where the end face 2111 intersects with the side face 2121, so as to specifically improve the connection stability of the part of the second part 252 that is prone to warping or detachment, thereby reducing the risk of the second part 252 warping or detachment.

[0145] refer to Figure 4 , Figure 7 , Figure 8 In some embodiments, the electrode terminal 22 is disposed on the end face 2111, and on the same projection plane parallel to the end face 2111, the orthographic projection of the electrode terminal 22 and the orthographic projection of the second part 252 are alternately arranged.

[0146] On the projection plane parallel to the end face 2111, the orthographic projection of the electrode terminal 22 and the orthographic projection of the second part 252 reflect the positional relationship between the second part 252 and the electrode terminal 22. The orthographic projections of the electrode terminal 22 and the second part 252 are staggered, that is, the orthographic projections of the electrode terminal 22 and the second part 252 do not overlap, that is, the second part 252 is not connected to the electrode terminal 22, thereby reducing the possible interference of the second part 252 on the conduction of electrical energy to the electrode terminal 22.

[0147] In this embodiment, the orthographic projection of the electrode assembly 24 is staggered with the orthographic projection of the second part 252 to reduce the interference that the second part 252 may cause to the transmission of electrical energy to the electrode terminal 22.

[0148] refer to Figure 4 , Figure 7 , Figure 8 In some embodiments, the battery cell 20 further includes a pressure relief structure 23 disposed on the end face 2111; on the same projection plane parallel to the end face 2111, the orthographic projection of the pressure relief structure 23 and the orthographic projection of the second part 252 are staggered.

[0149] The pressure relief structure 23 refers to the mechanism that releases internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold. The pressure relief structure 23 may include an explosion-proof valve, an explosion-proof diaphragm, or other structures.

[0150] On the projection plane parallel to the end face 2111, the orthographic projection of the pressure relief structure 23 and the orthographic projection of the second part 252 reflect the positional relationship between the second part 252 and the pressure relief structure 23. The orthographic projections of the pressure relief structure 23 and the second part 252 are staggered, that is, the orthographic projections of the pressure relief structure 23 and the second part 252 do not overlap, that is, the second part 252 does not cover the pressure relief structure 23, thereby reducing the possible interference of the second part 252 on the release of flue gas by the pressure relief structure 23.

[0151] In this embodiment, the orthographic projection of the pressure relief structure 23 and the orthographic projection of the second part 252 are staggered to reduce the interference of the second part 252 on the release of flue gas by the pressure relief structure 23.

[0152] In some embodiments, the housing 21 is prismatic in shape.

[0153] The shell 21 is prism-shaped. The shell 21 can be a quadrangular prism structure, that is, a cuboid structure, or a pentagonal prism or other prism structure.

[0154] For example, the shape of the casing 21 can be cuboid, in which case the battery cell 20 is a square-shell battery cell.

[0155] Because the insulating film 25 of the square battery cell 20 is more likely to lift up at the end face 2111, in this embodiment, the shape of the shell 21 can be prismatic, that is, the battery cell 20 can be a square battery cell 20, so as to reduce the risk of the insulating film 25 lifting up in the square battery cell 20.

[0156] In some embodiments, the battery cell 20 includes a housing 21, electrode terminals 22, a pressure relief structure 23, and an insulating film 25.

[0157] The housing 21 includes an end face 2111 and a bottom face 2122 disposed opposite to each other. The housing 21 also includes a side face 2121 disposed around the periphery of the housing 21. A fixing structure 213 is provided on the end face 2111 of the housing 21, and the fixing structure 213 is disposed around the edge of the end face 2111. The fixing structure 213 includes a plurality of protrusions disposed on the end face 2111, and the protrusions are spaced apart.

[0158] Electrode terminal 22 is disposed on end face 2111; pressure relief structure 23 is also disposed on end face 2111.

[0159] The insulating film 25 includes a first part 251 and a second part 252. The first part 251 is connected to the side 2121, and the second part 252 is bent relative to the first part 251 and connected to the fixing structure 213. When the fixing structure 213 includes a plurality of connecting parts 2131, the second part 252 covers each connecting part 2131, and a portion of the second part 252 is located between two adjacent connecting parts 2131.

[0160] Secondly, some embodiments of this application provide a battery device 100, including a battery cell 20 provided in some embodiments of the first aspect; in this battery device 100, the insulating film 25 is less likely to lift up on the end face 2111 of the battery cell 20, thereby improving the insulation performance and stability of the battery cell 20.

[0161] Thirdly, some embodiments of this application also provide an energy storage device 1, including a battery cell 20 provided in some embodiments of the first aspect, or a battery device 100 provided in some embodiments of the second aspect; wherein the battery cell 20 is used to store or provide electrical energy.

[0162] Energy storage device 1 includes one or more battery clusters to increase the voltage and capacity of energy storage device 1. A battery cluster may include multiple battery devices 100, which are connected in series via a busbar to increase the voltage of energy storage device 1. When energy storage device 1 includes multiple battery clusters, the battery clusters are connected in parallel to increase the capacity of energy storage device 1.

[0163] The energy storage device 1 can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems, etc. The energy storage device 1 can store electrical energy as needed and output it when appropriate. For example, the energy storage device 1 can store electrical energy during off-peak hours and provide power to relevant users or electrical equipment during peak hours. The energy storage system provided in this application embodiment can be any power system that requires the use of the energy storage device 1.

[0164] In some embodiments, the energy storage device 1 is an energy storage container or an energy storage cabinet.

[0165] In some embodiments, the energy storage device 1 may include a cabinet and one or more battery clusters, with the battery clusters housed in the cabinet.

[0166] In some embodiments, the energy storage device 1 may include modules such as a thermal management module, a main control module, a central control module, a power distribution module, and a fire protection module.

[0167] As an example, the thermal management module may include a liquid cooling unit that supplies coolant to each battery device 100 via piping to regulate the temperature of the individual battery cells 20.

[0168] As an example, the main control module can serve as the battery management unit for the battery cluster, used to monitor and manage the battery cluster. The main control module can monitor information such as the current, voltage, power, or temperature of the battery cluster. For instance, it can control the charging and discharging current and voltage of the battery cluster. The main control module includes modules such as an auxiliary battery management unit (SBMU) and a fusion switch.

[0169] As an example, the central control module can serve as the battery management unit for energy storage device 1, used to monitor and manage it. The central control module can monitor information such as current, voltage, power, state of charge, and temperature of energy storage device 1. For example, it can control the charging and discharging current and voltage of energy storage device 1. As an example, the central control module includes modules such as an insulation monitoring module (IMM), a master battery management unit (MBMU), an Ethernet (ETH) module, and a fiber optic conversion module.

[0170] As an example, the fire protection module includes a control panel, detectors, alarm devices, etc., used to detect, alarm, or extinguish fires in the energy storage system.

[0171] As an example, the power distribution module can be used to distribute power to the modules in the energy storage device 1 that require electricity.

[0172] Fourthly, refer to Figure 11 Some embodiments of this application also provide an energy storage system, including an energy storage device 1 and a power conversion device 2 provided in some embodiments of the third aspect, wherein the power conversion device 2 is used to electrically connect a power generation device 3 and an energy storage device 1.

[0173] An energy storage system may include one or more energy storage devices 1 and a power conversion system 2 (PCS), wherein the power conversion system 2 is connected between a power generation device 3 and an energy storage device 1. The power generation device 3 generates electrical energy, which can be stored in the energy storage device 1 via the power conversion system 2. As an example, the power generation device 3 may specifically be a solar panel, a hydroelectric power generation device 3, a thermal power generation device 3, a wind power generation device 3, etc. The specific type of the power generation device 3 is not limited in this application.

[0174] Fifthly, some examples of this application also provide an electrical device, including a battery cell 20 provided in some embodiments of the first aspect, or a battery device 100 provided in some embodiments of the second aspect; or an energy storage device 1 provided in some embodiments of the third aspect, or an energy storage system provided in some embodiments of the fourth aspect. The battery cell 20 is used to store or provide electrical energy.

[0175] Sixth aspect, refer to Figure 12 Some embodiments of this application also provide a charging network, including a charging pile 4 and an energy storage device 1 provided in some embodiments of the third aspect, or an energy storage system provided in some embodiments of the fourth aspect. The energy storage device 1 is used to provide electrical energy to the charging pile 4.

[0176] The charging pile 4 is electrically connected to the energy storage device 1, which provides power to the charging pile 4. The charging pile 4 is also electrically connected to the battery device 100 in the energy storage device 1 via a cable, allowing the battery device 100 to supply its stored energy to the charging pile 4. The charging pile 4 has one or more connectors 5 for connecting to electrical equipment (such as a vehicle 1000), thereby enabling the charging pile 4 to replenish its power.

[0177] The energy storage device 1 can be located inside the charging pile 4 (e.g., an integrated energy storage and charging unit) or outside the charging pile 4.

[0178] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that, include: The housing includes an end face and a bottom face disposed opposite to each other, and the housing also includes a side face disposed around the periphery of the housing, with the two ends of the side face being respectively connected to the end face and the bottom face; Electrode terminals are disposed on the housing; An insulating film includes a first part and a second part connected to the first part, the first part being connected to the side surface, and the second part being bent in the direction of the end face; The end face is provided with a fixing structure that connects at least part of the second part.

2. The battery cell according to claim 1, characterized in that, The surface roughness of the fixed structure is greater than the surface roughness of the end face.

3. The battery cell according to claim 1 or 2, characterized in that, In a direction perpendicular to the end face, the projection of the second part lies within the end face, and the projection of the second part at least partially overlaps with the fixed structure.

4. The battery cell according to claim 1, characterized in that, The fixing structure includes a plurality of connecting portions disposed on the end face, and the plurality of connecting portions are spaced apart. At least a portion of the second part is connected to the connecting part, and at least a portion of the second part is located in the gap between two adjacent connecting parts.

5. The battery cell according to claim 4, characterized in that, The surface roughness of the connecting part is greater than the surface roughness of the end face.

6. The battery cell according to claim 4, characterized in that, The fixing structure includes a plurality of granular structures spaced apart on the end face.

7. The battery cell according to claim 1, characterized in that, The fixing structure includes an adhesive layer, one side of which is connected to the end face, and the other side of which is connected to the second part.

8. The battery cell according to claim 1, characterized in that, The fixing structure is located at the edge of the end face and is arranged around the end face.

9. The battery cell according to claim 1, characterized in that, The fixing structure is located at the corner of the end face; and / or The fixing structure is located at the middle of the edge of the end face.

10. The battery cell according to claim 1, characterized in that, The electrode terminal is disposed on the end face, and on the same projection plane parallel to the end face, the orthographic projection of the electrode terminal and the orthographic projection of the second part are staggered.

11. The battery cell according to claim 1, characterized in that, The battery cell also includes a pressure relief structure disposed on the end face; On the same projection plane parallel to the end face, the orthographic projection of the pressure relief structure and the orthographic projection of the second part are staggered.

12. The battery cell according to claim 1, characterized in that, The shell is prismatic in shape.

13. A battery device, characterized in that, Includes the battery cell as described in any one of claims 1-12.

14. An energy storage device, characterized in that, Includes a battery cell as described in any one of claims 1-12, or a battery device as described in claim 13; the battery cell is used to store or provide electrical energy.

15. An energy storage system, characterized in that, It includes the energy storage device and power conversion device as described in claim 14, wherein the power conversion device is used to electrically connect the power generation device and the energy storage device.

16. An electrical appliance, characterized in that, It includes a battery cell as described in any one of claims 1-12, a battery device as described in claim 13, an energy storage device as described in claim 14, or an energy storage system as described in claim 15; the battery cell is used to store or provide electrical energy.

17. A charging network, characterized in that, Includes the energy storage device as described in claim 14, or the energy storage system as described in claim 15; The charging network also includes charging piles, and the energy storage device is used to provide power to the charging piles.

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