Battery monomer, battery and electric device

Abstract

The utility model provides a battery monomer, a battery and a power utilization device. The battery cell includes a housing, an insulating film, and a protective member. The outer surface of the housing includes two first surfaces, a second surface, and a third surface. The insulating film is integrally arranged and comprises a main body area and an ending area, the main body area covers the two first surfaces and the second surface, the ending area covers the third surface and is connected with the main body area, the ending area comprises a plurality of folding lugs, the folding lugs are at least partially overlapped, and the folding lugs comprise first folding lugs and second folding lugs; one part of the first folding lug is self-folded to form a folding part with a plurality of layers of insulating films, the folding part is laminated on one side, back to the third surface, of the second folding lug, and at least one part of the fold edge of the folding part is exposed on the surface of one side, back to the third surface, of the second folding lug. The protection component is connected to one side, back to the housing, of the insulating film, and at least covers the crease edge exposed on the surface of one side, back to the third surface, of the second folding lug. According to the invention, the reliability of the battery monomer can be improved.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and particularly to a battery cell, a battery, and an electrical device. Background Art

[0002] With the development of new energy technologies, batteries are increasingly widely used, such as in mobile phones, laptop computers, battery cars, electric vehicles, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and power tools, etc.

[0003] In the development of battery technologies, the reliability of battery cells directly affects the reliability, usage cost, and user experience of end products. Therefore, how to effectively improve the reliability of battery cells is an urgent technical problem in battery technologies. Summary of the Utility Model

[0004] In view of the above problems, this application provides a battery cell, a battery, and an electrical device, which can effectively improve the reliability of the battery cell.

[0005] In a first aspect, an embodiment of this application provides a battery cell. The battery cell includes a housing, an insulating film, and a protection component. The outer surface of the housing includes two first surfaces, a second surface, and a third surface. The two first surfaces are arranged opposite to each other. The second surface connects the two first surfaces. The third surface connects the two first surfaces. The first surface, the second surface, and the third surface intersect with each other. The insulating film is integrally provided and includes a main body area and a tail area. The main body area covers the two first surfaces and the second surface. The tail area covers the third surface and connects to the main body area. The tail area includes a plurality of folding ears. The plurality of folding ears at least partially overlap. The plurality of folding ears include a first folding ear and a second folding ear. A part of the first folding ear self-folds to form a folding part with multiple layers of insulating film. The folding part is stacked on the side of the second folding ear facing away from the third surface, and at least part of the crease edge of the folding part is exposed on the surface of the second folding ear facing away from the third surface. The protection component is connected to the side of the insulating film facing away from the housing and covers at least the crease edge exposed on the surface of the second folding ear facing away from the third surface.

[0006] Through the above technical solution, by providing the protection component, the protection component covers at least the crease edge exposed on the surface of the second folding ear facing away from the third surface, so as to at least seal the gap between the crease edge and the second folding ear, and can cut off the conduction relationship between the gap between the folding part and the second folding ear and the external environment, thereby being able to reduce the risk of insulation failure when abnormal conditions such as electrolyte leakage or thermal runaway occur in the battery cell, so as to improve the reliability of the battery cell.

[0007] In some embodiments of the first aspect, the protection component covers the folding part.

[0008] The protective component of the above technical solution can seal the gap between the entire folding part and the second folding ear, thereby further improving the reliability of the battery cell.

[0009] In some embodiments of the first aspect, the protective component covers the first folding ear.

[0010] The above technical solution can further increase the coverage area of the protective component, thereby further improving the sealing effect of the protective component on the gap between the folding part and the second folding ear.

[0011] In some embodiments of the first aspect, the protective component includes a main body part and a bending part. The main body part is connected to the side of the end area facing away from the housing, and the main body part at least covers the crease edge exposed on the side surface of the second folding ear facing away from the third surface. The bending part extends from the edge of the main body part close to the main body area and bends in the direction towards the main body area, and at least part of the bending part is connected to the main body area.

[0012] The bending part of the above technical solution can extend to the main body area of the insulating film and be connected to it. On the one hand, it can increase the connection contact area between the protective component and the insulating film, thereby improving the stability of the protective component; on the other hand, the introduction of the bending part enables the protective component to form an enclosed coverage at the position where the folding part is located, so as to reduce the risk of the gap between the edge of the protective component and the insulating film causing the sealing failure of the gap between the folding part and the second folding ear, thereby further improving the reliability of the battery cell.

[0013] In some embodiments of the first aspect, the main body area includes two first sub-areas and a second sub-area. The two first sub-areas respectively cover two first surfaces, and the second sub-area covers the second surface. The bending part includes a first bending part. The first bending part extends from the edge of the main body part close to the first sub-area and bends in the direction towards the first sub-area, and at least part of the first bending part is connected to the first sub-area.

[0014] The first bending part of the above technical solution is connected to the first sub-area. The area of the first sub-area is relatively large, which can provide a relatively large layout space for the first bending part, thereby facilitating the reduction of the setting difficulty of the bending part, improving the product yield of the battery cell and reducing the cost.

[0015] In some embodiments of the first aspect, the bending part includes a second bending part. The second bending part extends from the edge of the main body part close to the second sub-area and bends in the direction towards the second sub-area, and at least part of the second bending part is connected to the second sub-area.

[0016] Through the cooperation of the first bending part and the second bending part of the above technical solution, the risk of the gap between the edge of the protective component and the insulating film causing the sealing failure of the gap between the folding part and the second folding ear can be further reduced.

[0017] In some embodiments of the first aspect, a first dimension f of the bending member in its extending direction satisfies the relationship: f≥0.5 mm.

[0018] By setting the first dimension f of the bending member in its extending direction within the above range, the above technical solution can effectively improve the stability of the protection component.

[0019] In some embodiments of the first aspect, the first dimension f satisfies the relationship: f≥1 mm. This can further improve the stability of the protection component.

[0020] In some embodiments of the first aspect, the outer surface of the housing includes two third surfaces, two first surfaces are oppositely arranged in a first direction, two third surfaces are oppositely arranged in a second direction, each third surface connects the two first surfaces, the second surface is located on one side of the housing in a third direction and connects the first surface and the third surface, and the first direction, the second direction, and the third direction are perpendicular to each other pairwise. The main body area includes two first sub-areas and a second sub-area, the two first sub-areas respectively cover the two first surfaces, the second sub-area covers the second surface, and the insulating film includes two end areas, and the two end areas respectively cover the two third surfaces.

[0021] The above technical solution adopts a film wrapping method, so that the end areas can be located on the side of the housing, thereby reducing the difficulty of setting the protection component, which is beneficial to improving the production efficiency of the battery cell and reducing the cost.

[0022] In some embodiments of the first aspect, each end area includes two first folding ears and a second folding ear. The first folding ear is connected to one end of the first sub-area close to the third surface, and the two first folding ears in the same end area are respectively folded from the two first sub-areas towards the third surface relatively. The second folding ear is connected to one end of the second sub-area close to the third surface and is folded from the second sub-area towards the third surface.

[0023] The thickness of the folding part of the film wrapping method of the above technical solution is small, that is, the number of insulating film layers in the folding part is small. On the one hand, it is beneficial to reduce the overall volume of the battery cell and improve the energy density of the battery cell; on the other hand, due to the small thickness of the folding part, the protrusion degree of the protection component can also be reduced, thereby reducing the risk of interference between the protection component and other components around the battery cell.

[0024] In some embodiments of the first aspect, each end area includes a first folding ear and two second folding ears. The first folding ear is connected to one end of the second sub-area close to the third surface and is folded from the second sub-area towards the third surface relatively. The second folding ear is connected to one end of the first sub-area close to the third surface, and the two second folding ears in the same end area are respectively folded from the two first sub-areas towards the third surface relatively.

[0025] The folding area of ​​this type of coating in the above technical solution is smaller, which can reduce the setting area of ​​the protective component. On the one hand, it can reduce the occupation of the external space of the battery cell by the protective component, which is beneficial to improve the energy density of the battery cell; on the other hand, it can reduce the use of materials for preparing the protective component and reduce production costs.

[0026] In some embodiments of the first aspect, a second dimension g of the protection component along the third direction and a third dimension d of the folded portion along the third direction satisfy the relationship: gd≥1 mm.

[0027] The above technical solution sets the difference gd between the second dimension g of the protective component along the third direction and the third dimension d of the folding portion along the third direction within the above range. On the one hand, it can reduce the requirements for positioning accuracy during the setting of the protective component and improve the convenience of setting the protective component; on the other hand, it can reduce the risk of sealing failure of the gap between the folding portion and the second folding ear due to leakage of the protective component.

[0028] In some embodiments of the first aspect, the third dimension d and the second dimension g satisfy the relationship: gd≥2 mm, which can further reduce the requirement for positioning accuracy during the setting of the protective component and further reduce the risk of sealing failure of the gap between the folded portion and the second folded ear due to leakage of the protective component.

[0029] In some embodiments of the first aspect, a fourth dimension e of the protection component along the second direction satisfies the relationship: 0.02 mm≤e≤200 mm.

[0030] The above technical solution can improve the structural strength of the protection component while taking into account the energy density of the battery cell by setting the fourth dimension e of the protection component along the second direction within the above range.

[0031] In some embodiments of the first aspect, the fourth dimension e satisfies the relationship: 0.05 mm ≤ e ≤ 100 mm, which can further improve the balance between the structural strength of the protection component and the energy density of the battery cell.

[0032] In a second aspect, the present application provides a battery, which includes a battery cell provided by any embodiment of the first aspect.

[0033] In a third aspect, the present application provides an electrical device, comprising a battery cell provided by any embodiment of the first aspect, wherein the battery cell is used to provide electrical energy.

[0034] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. Description of the Drawings

[0035] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of illustrating the preferred embodiments and are not considered to be a limitation of the present application. Also, throughout the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0036] Figure 1 Schematic structural diagram of a vehicle provided by some embodiments of the present application;

[0037] Figure 2 Schematic explosion structural diagram of a battery provided by some embodiments of the present application;

[0038] Figure 3 Schematic structural diagram of a battery module provided by some embodiments of the present application;

[0039] Figure 4 Schematic three-dimensional structural diagram of a battery cell provided by some embodiments of the present application;

[0040] Figure 5 Schematic three-dimensional structural diagram of the positional relationship between a battery cell and an insulating film provided by some embodiments of the present application;

[0041] Figure 6 Schematic three-dimensional structural diagram in which the first surface of a battery cell is attached to the main body area of the insulating film and the second surface of the battery cell is attached to the main body area of the insulating film provided by some embodiments of the present application;

[0042] Figure 7 Schematic three-dimensional structural diagram in which the third surface of a battery cell is attached to the second folding ear of the insulating film provided by some embodiments of the present application;

[0043] Figure 8 Schematic three-dimensional structural diagram in which the third surface of a battery cell is attached to the first folding ear of the insulating film provided by some embodiments of the present application;

[0044] Figure 9 Schematic three-dimensional structural diagram of the positional relationship between a battery cell after being coated with a film and a protection component provided by some embodiments of the present application;

[0045] Figure 10 Schematic three-dimensional structural diagram of the cooperation between a battery cell after being coated with a film and a protection component provided by some embodiments of the present application;

[0046] Figure 11 Schematic three-dimensional structural diagram of a protection component provided by some embodiments of the present application;

[0047] Figure 12 A top - view structural schematic diagram of a protection component provided by some embodiments of the present application;

[0048] Figure 13 A side - view structural schematic diagram of a battery cell after being coated with a film provided by some embodiments of the present application;

[0049] Figure 14 A side - view structural schematic diagram of a battery cell after being coated with a film and cooperating with a protection component provided by some embodiments of the present application;

[0050] Figure 15 A three - dimensional structural schematic diagram of the positional relationship between another battery cell and an insulating film provided by some embodiments of the present application;

[0051] Figure 16 A three - dimensional structural schematic diagram of another battery cell in which the first surface of the battery cell is attached to the main body area of the insulating film and the second surface of the battery cell is attached to the main body area of the insulating film provided by some embodiments of the present application;

[0052] Figure 17 A three - dimensional structural schematic diagram of another battery cell in which the third surface of the battery cell is attached to the second folding ear of the insulating film provided by some embodiments of the present application;

[0053] Figure 18 A three - dimensional structural schematic diagram of another battery cell in which the third surface of the battery cell is attached to the first folding ear of the insulating film provided by some embodiments of the present application;

[0054] Figure 19 A three - dimensional structural schematic diagram of the positional relationship between another battery cell after being coated with a film and a protection component provided by some embodiments of the present application;

[0055] Figure 20 A three - dimensional structural schematic diagram of another battery cell after being coated with a film and cooperating with a protection component provided by some embodiments of the present application.

[0056] The reference numerals in the specific embodiments are as follows:

[0057] 1. Vehicle; 2. Battery; 3. Controller; 4. Motor; 5. Box; 5a. First box part; 5b. Second box part; 5c. Accommodating space; 6. Battery module; 7. Battery cell

[0058] 10. Housing; 11. First surface; 12. Second surface; 13. Third surface; 20. Insulating film; 21. Main body area; 22. Ending area; 221. First folding ear; 2211. Folding part; 2212. Crease edge; 2213. Connecting part; 222. Second folding ear; 30. Protection component; 31. Body part; 32. Bending part; 321. First bending part; 322. Second bending part; X. First direction; Y. Second direction; Z. Third direction. Detailed implementation manners

[0059] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Apparently, the described embodiments are some but not all of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0060] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as commonly understood by those skilled in the technical field to which the present application belongs; the terms used in the description of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "including" and "having" and any variations thereof in the description and claims of the present application and the above drawings are intended to cover non-exclusive inclusion. The terms "first", "second", etc. in the description and claims of the present application or the above drawings are used to distinguish different objects and are not used to describe a specific order or primary-secondary relationship.

[0061] Referring to "embodiments" in the present application means that specific features, structures or characteristics described in connection with the embodiments can be included in at least one embodiment of the present application. The phrase appears in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments.

[0062] In the description of the present application, it should be noted that, unless otherwise clearly defined and limited, the terms "installed", "connected", "connected to", "attached to" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the internal communication of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0063] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that there can be three relationships. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. Additionally, in this application, the character " / " generally indicates that the related objects before and after are in an "or" relationship.

[0064] In the embodiments of this application, the same reference numerals represent the same components. And for the sake of brevity, in different embodiments, the detailed description of the same components is omitted. It should be understood that the thickness, length, width, etc. of various components shown in the drawings in the embodiments of this application, as well as the overall thickness, length, width, etc. of the integrated device, are only for illustrative purposes and should not constitute any limitation to this application.

[0065] The term "a plurality of" as used in this application refers to two or more (including two).

[0066] In this application, the term "parallel" includes not only the case of absolute parallelism but also the case of approximately parallelism as conventionally recognized in engineering; at the same time, "perpendicular" also includes not only the case of absolute perpendicularity but also the case of approximately perpendicularity as conventionally recognized in engineering.

[0067] In the embodiments of this application, the battery cell can be a secondary battery cell, and a secondary battery cell refers to a battery cell that can be activated by charging after discharging so that the active material can be reused.

[0068] The battery cell can be a lithium-ion battery cell, a sodium-ion battery cell, a sodium-lithium-ion battery cell, a lithium-metal battery cell, a sodium-metal battery cell, a lithium-sulfur battery cell, a magnesium-ion battery cell, a nickel-metal hydride battery cell, a nickel-cadmium battery cell, a lead-acid battery cell, etc., and the embodiments of this application do not limit this.

[0069] In some embodiments, the battery cell can include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell), or an aluminum-plastic film, etc.

[0070] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. The prismatic battery cell includes a square-shell battery cell, a blade-shaped battery cell, a multi-prismatic battery, and the multi-prismatic battery is, for example, a hexagonal-prismatic battery, etc.

[0071] The battery mentioned in the embodiments of this application refers to a single physical module that includes one or more battery cells to provide a higher voltage and capacity.

[0072] In some embodiments, the battery can be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0073] In some embodiments, the battery may be a battery pack, which includes a box body and battery cells, and the battery cells or battery modules are accommodated in the box body.

[0074] In some embodiments, the box body may be part of the chassis structure of a vehicle. For example, part of the box body may become at least part of the floor of the vehicle, or part of the box body may become at least part of the cross beams and longitudinal beams of the vehicle.

[0075] In some embodiments, the battery may be an energy storage device. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0076] With the development of new energy technologies, batteries are increasingly widely used, such as in mobile phones, laptop computers, battery cars, electric vehicles, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and electric tools.

[0077] A battery generally includes a box body and a plurality of battery cells. The outer surface of the outer shell of the battery cell is generally coated with an insulating film to protect the battery cell.

[0078] In current battery cells, the insulating film of the battery cell is usually coated in a way of loop-shaped coating or U-shaped coating, which is simple, convenient and fast. However, the above coating methods usually form folded multi-layer insulating films in some areas of the outer shell. Moreover, the insulating film usually has adhesive on one side. In the folded multi-layer insulating films, there are folded parts formed by self-folding of some insulating films, so that there is no adhesive on both sides of the folded part in the thickness direction of itself. Therefore, in the folded multi-layer insulating films, there will be a gap between the folded part and the adjacent insulating film. When abnormal conditions such as electrolyte leakage or thermal runaway occur in the battery cell, the capillary effect will occur in the gap between the folded part and the adjacent insulating film, the electrolyte enters the gap and conducts between the outer shell and the box body under the action of voltage, causing insulation failure, thus affecting the reliability of the battery cell.

[0079] Based on the above considerations, an embodiment of the present application provides a battery cell. The battery cell includes a housing, an insulating film, and a protection component. The outer surface of the housing includes two first surfaces, a second surface, and a third surface. The two first surfaces are disposed opposite to each other. The second surface connects the two first surfaces. The third surface connects the two first surfaces. The first surface, the second surface, and the third surface intersect with each other. The insulating film is integrally provided and includes a main body region and a finishing region. The main body region covers the two first surfaces and the second surface. The finishing region covers the third surface and is connected to the main body region. The finishing region includes a plurality of tabs. The plurality of tabs at least partially overlap. The plurality of tabs include a first tab and a second tab. A part of the first tab self-folds to form a folded portion having multiple layers of insulating film. The folded portion is stacked on a side of the second tab facing away from the third surface, and at least a part of the crease edge of the folded portion is exposed on a surface of the second tab facing away from the third surface. The protection component is connected to a side of the insulating film facing away from the housing and at least covers the crease edge exposed on the surface of the second tab facing away from the third surface.

[0080] A part of the first tab self-folds to form a folded portion having multiple layers of insulating film. Both surfaces on both sides of the folded portion in the thickness direction of itself have no adhesive. Therefore, a gap will be generated between the folded portion and the second tab. Thus, in the above technical solution, by providing the protection component, the protection component at least covers the crease edge exposed on the surface of the second tab facing away from the third surface to at least seal the gap between the crease edge and the second tab, which can cut off the conduction relationship between the gap between the folded portion and the second tab and the external environment, thereby reducing the risk of insulation failure when abnormal conditions such as electrolyte leakage or thermal runaway occur in the battery cell, and improving the reliability of the battery cell.

[0081] The technical solution described in the embodiment of the present application is applicable to batteries and electrical devices using the batteries.

[0082] The electrical device can be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, etc. The vehicle can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle, or an extended-range electric vehicle, etc.; the spacecraft includes an airplane, a rocket, a space shuttle, a spaceship, etc.; the electric toy includes a fixed or mobile electric toy, for example, a game console, an electric vehicle toy, an electric ship toy, an electric airplane toy, etc.; the electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool, and a railway electric tool, for example, an electric drill, an electric grinder, an electric wrench, an electric screwdriver, a hammer drill, an impact electric drill, a concrete vibrator, an electric planer, etc. The embodiment of the present application does not impose special restrictions on the above electrical devices.

[0083] It should be understood that the technical solutions described in the embodiments of the present application are not only limited to the batteries and electrical equipment described above, but can also be applied to all batteries including battery boxes and electrical equipment using batteries. However, for the sake of simplicity of description, the following embodiments will be described by taking electric vehicles as examples.

[0084] Figure 1 FIG. is a schematic structural diagram of a vehicle provided by some embodiments of the present application.

[0085] Continue to refer to Figure 1 , a battery 2 is disposed inside the vehicle 1, and the battery 2 can be disposed at the bottom, head or tail of the vehicle 1. The battery 2 can be used to supply power to the vehicle 1. For example, the battery 2 can be used as the operating power source of the vehicle 1.

[0086] The vehicle 1 may further include a controller 3 and a motor 4. The controller 3 is used to control the battery 2 to supply power to the motor 4. For example, it is used for the working power requirements during the start, navigation and driving of the vehicle 1.

[0087] In some embodiments of the present application, the battery 2 can not only be used as the operating power source of the vehicle 1, but also as the driving power source of the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0088] Figure 2 FIG. is an exploded structural diagram of a battery provided by some embodiments of the present application.

[0089] Continue to refer to Figure 2 , the battery 2 includes a box body 5 and battery cells, and the battery cells are accommodated in the box body 5.

[0090] The box body 5 is used to accommodate the battery cells, and the box body 5 can be of various structures. In some embodiments, the box body 5 may include a first box body part 5a and a second box body part 5b. The first box body part 5a and the second box body part 5b are covered with each other, and the first box body part 5a and the second box body part 5b jointly define an accommodation space 5c for accommodating the battery cells. The second box body part 5b can be a hollow structure with one end open, and the first box body part 5a is a plate-like structure. The first box body part 5a covers the open side of the second box body part 5b to form the box body 5 with the accommodation space 5c; both the first box body part 5a and the second box body part 5b can also be hollow structures with one side open, and the open side of the first box body part 5a covers the open side of the second box body part 5b to form the box body 5 with the accommodation space 5c. Of course, the first box body part 5a and the second box body part 5b can be of various shapes, such as a cylinder, a cuboid, etc.

[0091] To improve the sealing performance after the connection between the first box body part 5a and the second box body part 5b, a sealing member, such as a sealant, a sealing ring, etc., can also be provided between the first box body part 5a and the second box body part 5b.

[0092] Assume that the first box body part 5a covers the top of the second box body part 5b. The first box body part 5a can also be called the upper box cover, and the second box body part 5b can also be called the lower box body.

[0093] In the battery 2, the battery cells can be one or more. If there are multiple battery cells, they can be connected in series, parallel, or in a combination of series and parallel (mixed connection). Mixed connection means that there are both series and parallel connections among multiple battery cells. Multiple battery cells can be directly connected in series, parallel, or in a mixed connection together, and then the whole formed by multiple battery cells is accommodated in the box body 5. Of course, it is also possible that multiple battery cells are first connected in series, parallel, or in a mixed connection to form battery modules 6, and then multiple battery modules 6 are connected in series, parallel, or in a mixed connection to form a whole and are accommodated in the box body 5.

[0094] Figure 3 The figure is a schematic structural diagram of a battery module provided by some embodiments of the present application.

[0095] In some embodiments, referring to the figure continuously, there are multiple battery cells 7. Multiple battery cells 7 are first connected in series, parallel, or in a mixed connection to form battery modules 6. Then multiple battery modules 6 are connected in series, parallel, or in a mixed connection to form a whole and are accommodated in the box body.

[0096] The multiple battery cells 7 in the battery module 6 can be electrically connected through a busbar component to achieve parallel, series, or mixed connection of the multiple battery cells 7 in the battery module 6.

[0097] Figure 4 The figure is a three-dimensional structural diagram of a battery cell provided by some embodiments of the present application. Figure 5 The figure is a three-dimensional structural diagram of the positional relationship between a battery cell and an insulating film provided by some embodiments of the present application. Figure 6 The figure is a three-dimensional structural diagram of the main body area of an insulating film in contact with the first surface of a battery cell and the main body area of the insulating film in contact with the second surface of the battery cell provided by some embodiments of the present application. Figure 7 The figure is a three-dimensional structural diagram of the third surface of a battery cell in contact with the second folding ear of an insulating film provided by some embodiments of the present application. Figure 8 The figure is a three-dimensional structural diagram of the third surface of a battery cell in contact with the first folding ear of an insulating film provided by some embodiments of the present application. Figure 9 The figure is a three-dimensional structural diagram of the positional relationship between a battery cell after being wrapped with a film and a protection component provided by some embodiments of the present application. Figure 10 The figure is a three-dimensional structural diagram of the cooperation between a battery cell after being wrapped with a film and a protection component provided by some embodiments of the present application. Figure 11 The figure is a three-dimensional structural diagram of a protection component provided by some embodiments of the present application. Figure 12A top - view structural schematic diagram of a protection component provided by some embodiments of the present application. Figure 13 A side - view structural schematic diagram of a battery cell after being coated with a film provided by some embodiments of the present application. Figure 14 A side - view structural schematic diagram of a battery cell after being coated with a film and cooperating with a protection component provided by some embodiments of the present application.

[0098] Referring to Figures 4 to 14 , some embodiments of the present application provide a battery cell 7. The battery cell 7 includes a housing 10, an insulating film 20, and a protection component 30. The outer surface of the housing 10 includes two first surfaces 11, a second surface 12, and a third surface 13. The two first surfaces 11 are disposed opposite to each other. The second surface 12 connects the two first surfaces 11. The third surface 13 connects the two first surfaces 11. The first surface 11, the second surface 12, and the third surface 13 intersect with each other. The insulating film 20 is integrally provided and includes a main body region 21 and a finishing region 22. The main body region 21 covers the two first surfaces 11 and the second surface 12. The finishing region 22 covers the third surface 13 and connects to the main body region 21. The finishing region 22 includes a plurality of folding ears. The plurality of folding ears at least partially overlap. The plurality of folding ears include a first folding ear 221 and a second folding ear 222. A part of the first folding ear 221 self - folds to form a folding part 2211 with multiple layers of the insulating film 20. The folding part 2211 is stacked on the side of the second folding ear 222 facing away from the third surface 13, and at least a part of the crease edge 2212 of the folding part 2211 is exposed on the surface of the second folding ear 222 facing away from the third surface 13. The protection component 30 is connected to the side of the insulating film 20 facing away from the housing 10 and covers at least the crease edge 2212 exposed on the surface of the second folding ear 222 facing away from the third surface 13.

[0099] Exemplarily, the housing 10 is a component for forming the internal environment of the battery cell 7. Among them, the formed internal environment can be used to accommodate the electrode assembly, the electrolyte, and other components. The electrode assembly is a component in which an electrochemical reaction occurs in the battery cell 7. The electrode assembly is mainly formed by winding or laminating a positive electrode sheet and a negative electrode sheet, and usually a separator is provided between the positive electrode sheet and the negative electrode sheet. The parts of the positive electrode sheet and the negative electrode sheet with active materials constitute the main body part of the electrode assembly. The parts of the positive electrode sheet and the negative electrode sheet without active materials respectively constitute the electrode tabs. The positive electrode tab and the negative electrode tab can be located at one end of the main body part together or at two ends of the main body part respectively. During the charging and discharging process of the battery, the positive active material and the negative active material react with the electrolyte, and the electrode tabs are connected to the electrode terminals to form a current loop.

[0100] Optionally, the housing 10 can be made of, but not limited to, metal or non - metal materials. For example, the metal material can be copper, aluminum, or stainless steel, etc.; the non - metal material can be polyethylene, polypropylene, or polyvinyl chloride, etc.

[0101] In some embodiments of the present application, the outer shell 10 is square. The outer shell 10 includes a housing and an end cap. The housing has an opening, and the end cap covers the opening. The first surface 11, the second surface 12, and the third surface 13 are all provided on the housing. The first surface 11 can be understood as the large surface on the circumferential side surface of the housing. Here, the circumferential side surface refers to the surface along the periphery of the opening. The large surface means the surface with a larger area on the circumferential side surface of the housing. One of the second surface 12 and the third surface 13 can be understood as the small surface on the circumferential side surface of the housing, and the other of the second surface 12 and the third surface 13 can be understood as the bottom surface of the housing. Here, the small surface means the surface with a smaller area on the circumferential side surface of the housing, and the bottom surface refers to the surface of the housing opposite to the opening.

[0102] In some examples, when the square outer shell 10 is coated with the insulating film 20 in a looped wrapping manner, the first surface 11 is the large surface, the second surface 12 is the small surface, and the third surface 13 is the bottom surface.

[0103] In some examples, when the square outer shell 10 is coated with the insulating film 20 in a U-shaped wrapping manner, the first surface 11 is the large surface, the second surface 12 is the bottom surface, and the third surface 13 is the small surface.

[0104] In the embodiments disclosed in the present application, the insulating film 20 is coated on the outer surface of the outer shell 10. On the one hand, the insulating film 20 can play an insulating and protective role for the battery cell 7, reducing the risk of short circuit of the battery cell 7 during normal use. On the other hand, it can also make the appearance of the battery cell 7 more beautiful. Optionally, the insulating film 20 can be, but is not limited to, made of polyethylene, polypropylene, or other polymer materials.

[0105] The meaning of the integral setting of the insulating film 20 is that the insulating film 20 has been in an integral form before wrapping the outer shell 10.

[0106] The main body area 21 refers to the part of the insulating film 20 that covers the outer shell 10 in a flat-laying manner, and the end area 22 refers to the part of the insulating film 20 that covers the outer shell 10 in a folded manner. In other words, during the process of coating the insulating film 20 on the battery cell 7, the insulating film 20 first covers the first surface 11 and the second surface 12 of the outer shell 10 to form the main body area 21. The part of the insulating film 20 that exceeds the main body area 21 serves as a plurality of folding ears, and the plurality of folding ears cover the third surface 13 of the outer shell 10 by folding to form the end area 22. It should be noted that generally, the covering area of the main body area 21 is larger than the covering area of the end area 22.

[0107] It can be understood that during the process in which multiple folding ears cover the third surface 13 of the housing 10 in a folding manner to form the end region 22, there is a sequence for the folding of each folding ear among the multiple folding ears.

[0108] The second folding ear 222 refers to the folding ear that is folded first. The second folding ear 222 will be attached to the third surface 13 in a flat-laying form. The first folding ear 221 refers to the folding ear that is folded later relative to the second folding ear 222. Since the insulating film 20 is integrally provided, the first folding ear 221 and the second folding ear 222 are connected. During the folding process of the second folding ear 222, a part of the first folding ear 221 close to the second folding ear 222 will be driven to fold synchronously, so that this part of the first folding ear 221 close to the second folding ear 222 is folded against the other part of the first folding ear 221 to form a folded portion 2211 with two layers of insulating film 20. After the first folding ear 221 is folded, the folded portion 2211 will be stacked on the side of the second folding ear 222 facing away from the third surface 13.

[0109] It should be noted that during the folding process of the second folding ear 222, when the first folding ear 221 is affected by the folding of the second folding ear 222 to form the folded portion 2211, depending on the specific folding method, it may form a folded portion 2211 with two layers of insulating film 20, or it may form a folded portion 2211 with three layers of insulating film 20, or it may form a folded portion 2211 with more layers of insulating film 20. That is to say, the formation of the folded portion 2211 can be described as a folded structure with multiple layers of insulating film 20 formed by self-folding of a part of the first folding ear 221. To more clearly illustrate the embodiments of the present application, the following will take the example that this part of the first folding ear 221 close to the second folding ear 222 is folded against the other part of the first folding ear 221 to form a folded portion 2211 with two layers of insulating film 20 for illustration.

[0110] In the embodiments disclosed in the present application, the insulating film 20 is usually provided with adhesive on one side, that is to say, the insulating film 20 has one side with a back adhesive surface. During the process of covering the battery cell 7 with the insulating film 20, the insulating film 20 is first attached to the first surface 11 and the second surface 12 of the housing 10 through the back adhesive surface to form the main body region 21. The part of the insulating film 20 that exceeds the main body region 21 serves as multiple folding ears, and the multiple folding ears are folded and attached to the third surface 13 of the housing 10 through the back adhesive surface to form the end region 22.

[0111] In the folding portion 2211, a part of the first folding ear 221 close to the second folding ear 222 is folded in half with another part of the first folding ear 221. That is to say, the adhesive surface of the part of the first folding ear 221 close to the second folding ear 222 adheres to the adhesive surface of the other part of the first folding ear 221, so that both sides of the folding portion 2211 in its own thickness direction have no adhesive. Therefore, a gap will be generated between the folding portion 2211 and the second folding ear 222. When abnormal conditions such as electrolyte leakage or thermal runaway occur in the battery cell 7, the capillary effect will occur in the gap between the folding portion 2211 and the second folding ear 222, and the electrolyte will enter the gap and conduct the outer shell 10 and the box body 5 under the action of voltage, triggering insulation failure, thereby affecting the reliability of the battery cell 7.

[0112] The following will introduce the specific structures of the embodiments of the present application in the form of loop wrapping and U-shaped wrapping respectively. It should be noted that Figures 5 to 8 FIG. is a schematic diagram of the specific step structure of a U-shaped wrapping method. The schematic diagram of the specific step structure of the loop wrapping method can refer to the existing relevant step diagrams and will not be shown here.

[0113] In some examples, when the square outer shell 10 is wrapped with the insulating film 20 in the U-shaped wrapping method, the outer shell 10 includes two first surfaces 11, one second surface 12, and two third surfaces 13. The first surface 11 is the large surface in the circumferential side of the square outer shell 10, the second surface 12 is the bottom surface of the square outer shell 10, and the third surface 13 is the small surface in the circumferential side of the square outer shell 10.

[0114] The insulating film 20 has two end regions 22 and six folding ears. Among them, each end region 22 is formed by three folding ears. Specifically, the insulating film 20 will first cover the two first surfaces 11 and one second surface 12 of the outer shell 10 to form the main body region 21 and six folding ears. For the convenience of description, the two third surfaces 13 are respectively configured as the first small surface and the second small surface, and the two end regions 22 are respectively configured as the first end region and the second end region. Three of the six folding ears are connected to one end of the main body region 21 close to the first small surface and surround the outer periphery of the first small surface, and these three folding ears are folded towards the first small surface to cover the first small surface to form the first end region; and, the other three of the six folding ears are connected to one end of the main body region 21 close to the second small surface and surround the outer periphery of the second small surface, and these three folding ears are folded towards the second small surface to cover the second small surface to form the second end region.

[0115] In the first end region, two of the three folding ears of the first end region are configured as two first folding ears 221, and the other one of the three folding ears of the first end region is configured as a second folding ear 222. The two first folding ears 221 are respectively connected to one end of the main body region 21 covering the two first surfaces 11 near the first small surface, and the second folding ear 222 is connected to one end of the main body region 21 covering the second surface 12 near the first small surface. Each first folding ear 221 has a folding portion 2211.

[0116] In the second end region, two of the three folding ears of the second end region are configured as two first folding ears 221, and the other one of the three folding ears of the second end region is configured as a second folding ear 222. The two first folding ears 221 are respectively connected to one end of the main body region 21 covering the two first surfaces 11 near the first small surface, and the second folding ear 222 is connected to one end of the main body region 21 covering the second surface 12 near the first small surface. Each first folding ear 221 has a folding portion 2211.

[0117] In some examples, when the square housing 10 is coated with the insulating film 20 in a loop-shaped coating manner, the housing 10 includes two first surfaces 11, two second surfaces 12, and a third surface 13. The first surface 11 is the large surface among the circumferential side surfaces of the square housing 10, the second surface 12 is the small surface among the circumferential side surfaces of the square housing 10, and the third surface 13 is the bottom surface of the square housing 10.

[0118] The insulating film 20 has an end region 22 and four folding ears. Specifically, the insulating film 20 first covers the two first surfaces 11 and the two second surfaces 12 along the circumference of the housing 10 to form a main body region 21 and four folding ears, and the four folding ears are folded towards the bottom surface to cover the bottom surface to form the end region 22. The four folding ears are configured as two first folding ears 221 and two second folding ears 222. The two first folding ears 221 are respectively connected to one end of the main body region 21 covering the two first surfaces 11 near the bottom surface, and the two second folding ears 222 are connected to one end of the main body region 21 covering the two second surfaces 12 near the bottom surface. Each first folding ear 221 has two folding portions 2211.

[0119] It should be noted that the present application is also applicable to other coating methods, and their structures and working principles are similar to the above-mentioned loop-shaped coating method and U-shaped coating method, which will not be elaborated here.

[0120] The crease edge 2212 of the folding portion 2211 refers to the edge portion where the crease line of the folding portion 2211 is located. For example, in the case where a part of the first folding tab 221 close to the second folding tab 222 is folded with another part of the first folding tab 221 to form the folding portion 2211, the position where the crease line is formed by folding the part of the first folding tab 221 close to the second folding tab 222 with another part of the first folding tab 221 is the crease edge 2212. A part of the crease edge 2212 of the folding portion 2211 may be exposed on one side surface of the second folding tab 222 facing away from the third surface 13, and the other part may be covered by other parts of the insulating film 20; the crease edge 2212 of the folding portion 2211 may also be entirely exposed on one side surface of the second folding tab 222 facing away from the third surface 13.

[0121] The protection component 30 is used to seal the gap between the folding portion 2211 and the second folding tab 222. The crease edge 2212 of the folding portion 2211, as the place closest to the gap between the folding portion 2211 and the second folding tab 222 and the external environment, the crease edge 2212 exposed on one side surface of the second folding tab 222 facing away from the third surface 13 can be understood as the entrance for the electrolyte to enter the gap. Therefore, closing this entrance, that is, sealing the gap between the crease edge 2212 exposed on one side surface of the second folding tab 222 facing away from the third surface 13 and the second folding tab 222, can prevent the electrolyte from entering the gap when abnormal conditions such as electrolyte leakage or thermal runaway occur in the battery cell 7.

[0122] Exemplarily, the protection component 30 can be detachably connected to the insulating film 20 or fixedly connected to the insulating film 20. Among them, the protection component 30 can be directly connected to the insulating film 20 or restricted on the insulating film 20 through other components. As an example, the connection method between the protection component 30 and the insulating film 20 can be but is not limited to riveting, snap - fitting, or bonding, etc.

[0123] Optionally, the protection component 30 can be but is not limited to a sheet - like structure, a plate - like structure, a block - like structure, or a film - like structure, etc.

[0124] Optionally, the protection component 30 can be made of a liquid - permeation - resistant insulating material, such as polyethylene, polypropylene, polyimide, or polyethylene terephthalate, etc.

[0125] Through the above technical solution, by providing the protection component 30, the protection component 30 at least covers the crease edge 2212 exposed on the surface of the second folding ear 222 facing away from the third surface 13, so as to at least seal the gap between the crease edge 2212 and the second folding ear 222, and can cut off the conduction relationship between the gap between the folding part 2211 and the second folding ear 222 and the external environment, thereby reducing the risk of insulation failure when abnormal conditions such as electrolyte leakage or thermal runaway occur in the battery cell 7, and improving the reliability of the battery cell 7.

[0126] In some embodiments, the protection component 30 covers the folding part 2211.

[0127] Exemplarily, the protection component 30 covering the folding part 2211 can be understood as that the projection of the folding part 2211 in the direction perpendicular to the third surface 13 is located within the projection of the protection component 30 in the direction perpendicular to the third surface 13.

[0128] The protection component 30 of the above technical solution can seal the entire gap between the folding part 2211 and the second folding ear 222, thereby further improving the reliability of the battery cell 7.

[0129] In some embodiments, the protection component 30 covers the first folding ear 221.

[0130] Exemplarily, the protection component 30 covering the first folding ear 221 can be understood as that the projection of the first folding ear 221 in the direction perpendicular to the third surface 13 is located within the projection of the protection component 30 in the direction perpendicular to the third surface 13.

[0131] The above technical solution can further increase the coverage area of the protection component 30, thereby further improving the sealing effect of the protection component 30 on the gap between the folding part 2211 and the second folding ear 222.

[0132] In some embodiments, the protection component 30 includes a main body part 31 and a bending part 32. The main body part 31 is connected to the side of the end area 22 facing away from the housing 10, and the main body part 31 at least covers the crease edge 2212 exposed on the surface of the second folding ear 222 facing away from the third surface 13. The bending part 32 extends from the edge of the main body part 31 close to the main body area 21 and bends in the direction towards the main body area 21, and at least part of the bending part 32 is connected to the main body area 21.

[0133] Exemplarily, the body member 31 refers to the part of the protection member 30 located in the finishing area 22, which is mainly used to cut off the conduction relationship between the gap between the folding part 2211 and the second folding ear 222 and the external environment. At least part of the bending member 32 is connected to the main body area 21. It can be understood that at least part of the bending member 32 extends from the finishing area 22 to the main body area 21 and is connected to the side of the main body area 21 facing away from the first surface 11. The bending member 32 is mainly used to further improve the sealing effect of the gap between the folding part 2211 and the second folding ear 222, and to improve the overall connection stability of the protection member 30.

[0134] The bending member 32 can be detachably connected to the body member 31 or fixedly connected to the body member 31. Among them, the bending member 32 can be directly connected to the body member 31 or restricted on the body member 31 through other components. As an example, the connection method between the bending member 32 and the body member 31 can be, but is not limited to, riveting, clamping or bonding, etc.

[0135] In some examples, the body member 31 and the bending member 32 are integrally formed structures. On the one hand, there is no need to connect the body member 31 and the bending member 32 through an additional connection process, which simplifies the manufacturing process flow. At the same time, compared with connecting the body member 31 and the bending member 32 through an additional connection process, the connection between the integrally formed body member 31 and the bending member 32 has a higher connection strength.

[0136] The bending member 32 of the above technical solution can extend to the main body area 21 of the insulating film 20 and be connected to it. On the one hand, it can increase the connection contact area between the protection member 30 and the insulating film 20, thereby improving the stability of the protection member 30; on the other hand, the introduction of the bending member 32 enables the protection member 30 to form an enclosing coverage at the position where the folding part 2211 is located, so as to reduce the risk of the sealing failure of the gap between the folding part 2211 and the second folding ear 222 due to the existence of a gap between the edge of the protection member 30 and the insulating film 20, thereby further improving the reliability of the battery cell 7.

[0137] In some embodiments, the main body area 21 includes two first sub-areas and a second sub-area. The two first sub-areas respectively cover the two first surfaces 11, and the second sub-area covers the second surface 12. The bending member 32 includes a first bending part 321. The first bending part 321 extends from the edge of the body member 31 close to the first sub-area and bends in the direction towards the first sub-area, and at least part of the first bending part 321 is connected to the first sub-area.

[0138] Exemplarily, the housing 10 is a square housing 10, and the two first surfaces 11 can be understood as two large surfaces among the circumferential sides of the housing 10. At least a part of the first bending portion 321 is connected to the first sub-region. It can be understood that at least a part of the first bending portion 321 extends from the end region 22 to the first sub-region and is connected to the side of the first sub-region facing away from the first surface 11.

[0139] In the above technical solution, the first bending portion 321 is connected to the first sub-region, and the area of the first sub-region is relatively large, which can provide a relatively large layout space for the first bending portion 321, thereby facilitating the reduction of the setting difficulty of the bending member 32, improving the product yield of the battery cell 7 and reducing the cost.

[0140] In some examples, the number of the first bending portions 321 is two, and the two first bending portions 321 respectively extend from the two side edges of the body member 31 close to the two first sub-regions and bend along the direction towards the first sub-region. So that the protection member 30 can form an encircling coverage at the position where the folding portion 2211 is located, to further improve the stability and sealing effect of the protection member 30.

[0141] In some embodiments, the bending member 32 includes a second bending portion, the second bending portion extends from the edge of the body member 31 close to the second sub-region and bends along the direction towards the second sub-region, and at least a part of the second bending portion is connected to the second sub-region.

[0142] Exemplarily, at least a part of the second bending portion is connected to the second sub-region. It can be understood that at least a part of the second bending portion extends from the end region 22 to the second sub-region and is connected to the side of the second sub-region facing away from the second surface 12.

[0143] Through the cooperation of the first bending portion 321 and the second bending portion, the above technical solution can further reduce the risk that the gap between the edge of the protection member 30 and the insulating film 20 causes the sealing failure of the gap between the folding portion 2211 and the second lug 222.

[0144] In some embodiments, the first dimension f of the bending member 32 in its own extending direction satisfies the relationship: f ≥ 0.5 mm.

[0145] Exemplarily, the first dimension f of the bending member 32 in its own extending direction can be understood as the extending length of the bending member 32. As an example, the first dimension f of the bending member 32 in its own extending direction can be, but is not limited to, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 20 mm, 30 mm, 40 mm, 50 mm, 60 mm, 70 mm, 80 mm, 90 mm, 100 mm, etc.

[0146] It can be understood that the larger the first dimension f of the bending member 32 along its own extension direction, the larger the connection contact area between the bending member 32 and the insulating member, and the higher the overall stability of the protection component 30.

[0147] In this way, by setting the first dimension f of the bending member 32 along its own extension direction within the above range, the above technical solution can effectively improve the stability of the protection component 30.

[0148] In some embodiments, the first dimension f satisfies the relationship: f≥1mm. This can further improve the stability of the protection component 30.

[0149] As an example, the first dimension f of the bending member 32 along its own extension direction can be, but is not limited to, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm, 10mm, 50mm, 100mm, 200mm, 300mm, 400mm, 500mm, etc.

[0150] Combined with Figure 4 、 Figure 10 、 Figure 11 and Figure 12 , in some examples, the outer surface of the housing 10 includes two third surfaces 13, two first surfaces 11 are oppositely arranged along the first direction X, two third surfaces 13 are oppositely arranged along the second direction Y, the second surface 12 is located on one side of the housing 10 along the third direction Z, and the first direction X, the second direction Y, and the third direction Z are perpendicular to each other in pairs. The dimension a of the housing 10 along the second direction Y and the first dimension f satisfy the relationship: 1mm≤f≤a. Wherein, the dimension a of the housing 10 along the second direction Y can be understood as the length of the housing 10.

[0151] This can prevent the bending member 32 from protruding out of the housing 10 along the second direction Y, reduce the occupation of the external space of the battery cell 7 by the bending member 32, and improve the energy density and consistency of the battery cell 7.

[0152] In some embodiments, the outer surface of the housing 10 includes two third surfaces 13, the two first surfaces 11 are oppositely arranged along the first direction X, the two third surfaces 13 are oppositely arranged along the second direction Y, each third surface 13 connects the two first surfaces 11, the second surface 12 is located on one side of the housing 10 along the third direction Z and connects the first surface 11 and the third surface 13, and the first direction X, the second direction Y, and the third direction Z are perpendicular to each other pairwise. The main body area 21 includes two first sub-areas and a second sub-area, the two first sub-areas respectively cover the two first surfaces 11, the second sub-area covers the second surface 12, and the insulating film 20 includes two end areas 22, and the two end areas 22 respectively cover the two third surfaces 13.

[0153] Exemplarily, the housing 10 is a square housing 10. The two first surfaces 11 can be understood as two large surfaces among the circumferential side surfaces of the housing 10, the second surface 12 can be understood as the bottom surface of the housing 10, and the two third surfaces 13 can be understood as two small surfaces among the circumferential side surfaces of the housing 10. The insulating film 20 has two end areas 22 and six folding ears. Among them, each end area 22 is formed by three folding ears.

[0154] As an example, the insulating film 20 can first cover one of the first surfaces 11 of the housing 10 to form a first sub-area, then the insulating film 20 is folded towards the second surface 12 and covers the second surface 12 to form a second sub-area, then the insulating film 20 is folded towards the other first surface 11 of the housing 10 to form another first sub-area and six folding ears, and then, three of the six folding ears are folded towards one of the two third surfaces 13 to form an end area 22, and the other three of the six folding ears are folded towards the other of the two third surfaces 13 to form another end area 22.

[0155] As another example, the insulating film 20 can also first cover the second surface 12 of the housing 10 to form a second sub-area, then the insulating film 20 is folded towards the two first surfaces 11 and covers the two first surfaces 11 to form two first sub-areas and six folding ears, and then, three of the six folding ears are folded towards one of the two third surfaces 13 to form an end area 22, and the other three of the six folding ears are folded towards the other of the two third surfaces 13 to form another end area 22.

[0156] The encapsulation method adopted in the above technical solution enables the end area 22 to be located on the side surface of the housing 10, thereby reducing the difficulty of setting the protection component 30, which is beneficial to improving the production efficiency of the battery cell 7 and reducing costs.

[0157] In some embodiments, each end region 22 includes two first folding ears 221 and a second folding ear 222. The first folding ears 221 are connected to one end of the first sub-region close to the third surface 13. The two first folding ears 221 in the same end region 22 are respectively folded from the two first sub-regions towards the third surface 13 relatively. The second folding ear 222 is connected to one end of the second sub-region close to the third surface 13 and is folded from the second sub-region towards the third surface 13.

[0158] Exemplarily, for the sake of convenience of description, the two third surfaces 13 are respectively configured as a first small surface and a second small surface, and the two end regions 22 are respectively configured as a first end region and a second end region. Three of the six folding ears are connected to one end of the main body region 21 close to the first small surface and surround the outer periphery of the first small surface, and these three folding ears are folded towards the first small surface to cover the first small surface to form the first end region; and, the other three of the six folding ears are connected to one end of the main body region 21 close to the second small surface and surround the outer periphery of the second small surface, and these three folding ears are folded towards the second small surface to cover the second small surface to form the second end region.

[0159] In the first end region, two of the three folding ears of the first end region are configured as two first folding ears 221, and the other one of the three folding ears of the first end region is configured as a second folding ear 222. The two first folding ears 221 are respectively connected to one end of the two first sub-regions close to the first small surface, and the second folding ear 222 is connected to one end of the second sub-region close to the first small surface. Each first folding ear 221 has a folding part 2211.

[0160] In the second end region, two of the three folding ears of the second end region are configured as two first folding ears 221, and the other one of the three folding ears of the second end region is configured as a second folding ear 222. The two first folding ears 221 are respectively connected to one end of the two first sub-regions close to the first small surface, and the second folding ear 222 is connected to one end of the second sub-region close to the first small surface. Each first folding ear 221 has a folding part 2211.

[0161] In some examples, the first folding ear 221 also has a cut. The cut is arranged close to the second folding ear 222. Due to the existence of the cut, in the process that the first folding ear 221 forms the folding part 2211 under the influence of the folding of the second folding ear 222, the existence of the cut will further reduce the area of the folding part 2211.

[0162] In the folding part 2211 of this encapsulation method of the above technical solution, the thickness is relatively small, that is, the number of layers of the insulating film 20 in the folding part 2211 is relatively small. On the one hand, it is beneficial to reduce the overall volume of the battery cell 7 and improve the energy density of the battery cell 7. On the other hand, due to the relatively small thickness of the folding part 2211, it can also reduce the protruding degree of the protection component 30, thereby reducing the risk of interference between the protection component 30 and other components around the battery cell 7.

[0163] In some embodiments, each end region 22 includes two first folding ears 221, and the two first folding ears 221 located in the same end region 22 partially overlap.

[0164] Exemplarily, for the convenience of description, the part of the first folding ear 221 excluding the folding part 2211 is configured as the connecting part 2213. In other words, the part of the first folding ear 221 that is not self-folded is configured as the connecting part 2213. The connecting part 2213 has a single layer of insulating film 20, and the two first folding ears 221 located in the same end region 22 partially overlap, and a stacked structure with multiple layers of insulating film 20 can be formed in the end region 22.

[0165] In some examples, in the same end region 22, the connecting parts 2213 of the two first folding ears 221 partially overlap, and the folding parts 2211 of the two first folding ears 221 do not overlap. In this way, a first stacked structure with two layers of insulating film 20 and a second stacked structure with three layers of insulating film 20 can be formed in the end region 22. Among them, the first stacked structure is formed by the overlapping of the connecting parts 2213 of the two first folding ears 221, a part of the second stacked structure is formed by the overlapping of the connecting parts 2213 of the two first folding ears 221 and the second folding ear 222, and another part of the second stacked structure is formed by the overlapping of the folding part 2211 of one first folding ear 221 and the second folding ear 222.

[0166] In some examples, in the same end region 22, the connecting parts 2213 of the two first folding ears 221 partially overlap, and the folding parts 2211 of the two first folding ears 221 also partially overlap. In this way, a first stacked structure with two layers of insulating film 20, a second stacked structure with three layers of insulating film 20, and a third stacked structure with five layers of insulating film 20 can be formed in the end region 22. Among them, the first stacked structure is formed by the overlapping of the connecting parts 2213 of the two first folding ears 221, a part of the second stacked structure is formed by the overlapping of the connecting parts 2213 of the two first folding ears 221 and the second folding ear 222, another part of the second stacked structure is formed by the overlapping of the folding parts 2211 of each first folding ear 221 and the second folding ear 222, and the third stacked structure is formed by the overlapping of the folding parts 2211 of the two first folding ears 221 and the second folding ear 222.

[0167] By partially overlapping two first folding ears 221 located in the same end region 22, the above technical solution can reduce the risk that part of the outer surface of the housing 10 is exposed to the external environment due to incomplete coverage of the end region 22, improve the coverage effect of the insulating film 20, and thus improve the reliability of the battery cell 7.

[0168] Figure 15 This is a schematic three-dimensional structure diagram of the positional relationship between another battery cell 7 and the insulating film 20 provided by some embodiments of the present application. Figure 16 This is a schematic three-dimensional structure diagram of the main body region 21 of the insulating film 20 being attached to the first surface 11 of another battery cell 7 and the main body region 21 of the insulating film 20 being attached to the second surface 12 of the battery cell 7 provided by some embodiments of the present application. Figure 17 This is a schematic three-dimensional structure diagram of the third surface 13 of another battery cell 7 being attached to the second folding ear 222 of the insulating film 20 provided by some embodiments of the present application. Figure 18 This is a schematic three-dimensional structure diagram of the third surface 13 of another battery cell 7 being attached to the first folding ear 221 of the insulating film 20 provided by some embodiments of the present application. Figure 19 This is a schematic three-dimensional structure diagram of the positional relationship between another battery cell 7 and the protection component 30 after the battery cell 7 is encapsulated provided by some embodiments of the present application. Figure 20 This is a schematic three-dimensional structure diagram of another battery cell 7 cooperating with the protection component 30 after the battery cell 7 is encapsulated provided by some embodiments of the present application.

[0169] Continue to refer to Figures 15 to 20 , Figures 15 to 18 This is a schematic structural diagram of the specific steps of another U-shaped encapsulation method.

[0170] In some embodiments, each end region 22 includes a first folding ear 221 and two second folding ears 222. The first folding ear 221 is connected to one end of the second sub-region close to the third surface 13 and is folded relatively from the second sub-region towards the third surface 13. The second folding ears 222 are connected to one end of the first sub-region close to the third surface 13, and the two second folding ears 222 located in the same end region 22 are respectively folded relatively from the two first sub-regions towards the third surface 13.

[0171] Exemplarily, for the sake of description, the two third surfaces 13 are respectively configured as a first small surface and a second small surface, and the two end regions 22 are respectively configured as a first end region and a second end region. Three of the six folding ears are connected to one end of the main body region 21 close to the first small surface and surround the outer periphery of the first small surface, and these three folding ears are folded towards the first small surface to cover the first small surface to form the first end region; and, the other three of the six folding ears are connected to one end of the main body region 21 close to the second small surface and surround the outer periphery of the second small surface, and these three folding ears are folded towards the second small surface to cover the second small surface to form the second end region.

[0172] In the first end region, one of the three folding ears of the first end region is configured as the first folding ear 221, and the other two of the three folding ears of the first end region are configured as two second folding ears 222. The first folding ear 221 is connected to one end of the second sub-region close to the first small surface, and the two second folding ears 222 are respectively connected to cover one ends of the two first sub-regions close to the first small surface. The first folding ear 221 has two folding portions 2211.

[0173] In the second end region, one of the three folding ears of the second end region is configured as the first folding ear 221, and the other two of the three folding ears of the second end region are configured as two second folding ears 222. The first folding ear 221 is connected to one end of the second sub-region close to the first small surface, and the two second folding ears 222 are respectively connected to cover one ends of the two first sub-regions close to the first small surface. The first folding ear 221 has two folding portions 2211.

[0174] In some examples, the first folding ear 221 further has a cut, and the cut is arranged close to the second folding ear 222. Due to the existence of the cut, during the process that the first folding ear 221 forms the folding portion 2211 under the influence of the folding of the second folding ear 222, the existence of the cut will further reduce the area of the folding portion 2211.

[0175] The area of the folding portion 2211 of this film wrapping method of the above technical solution is relatively small, which can reduce the set area of the protection component 30. On the one hand, it can reduce the occupation of the external space of the battery cell 7 by the protection component 30, which is beneficial to improving the energy density of the battery cell 7; on the other hand, it can reduce the use of materials for preparing the protection component 30 and can reduce the production cost.

[0176] Combined with Figure 13 and Figure 14 , in some embodiments, the relationship between the second dimension g of the protection component 30 in the third direction Z and the third dimension d of the folding portion 2211 in the third direction Z satisfies: g - d ≥ 1 mm.

[0177] As an example, the difference g - d between the second dimension g of the protection component 30 in the third direction Z and the third dimension d of the folding portion 2211 in the third direction Z can be but not limited to 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, 5.5 mm, 6 mm, 6.5 mm, 7 mm, 7.5 mm, 8 mm, 8.5 mm, 9 mm, 9.5 mm, 10 mm, 50 mm, 100 mm, 200 mm, 300 mm, 400 mm, 500 mm, etc.

[0178] It can be understood that the greater the difference g - d between the second dimension g of the protection component 30 in the third direction Z and the third dimension d of the folding part 2211 in the third direction Z, the lower the positioning accuracy requirement for the protection component 30 during the setting process of the protection component 30, and moreover, the smaller the risk of seal failure of the gap between the folding part 2211 and the second folding ear 222 due to the protection component 30 being missed covered.

[0179] Thus, by setting the difference g - d between the second dimension g of the protection component 30 in the third direction Z and the third dimension d of the folding part 2211 in the third direction Z within the above range, on the one hand, it can reduce the positioning accuracy requirement during the setting process of the protection component 30 and improve the setting convenience of the protection component 30; on the other hand, it can reduce the risk of seal failure of the gap between the folding part 2211 and the second folding ear 222 due to the protection component 30 being missed covered.

[0180] In some embodiments, the third dimension d and the second dimension g satisfy the relationship: g - d ≥ 2mm. This can further reduce the positioning accuracy requirement during the setting process of the protection component 30 and further reduce the risk of seal failure of the gap between the folding part 2211 and the second folding ear 222 due to the protection component 30 being missed covered.

[0181] As an example, the difference g - d between the second dimension g of the protection component 30 in the third direction Z and the third dimension d of the folding part 2211 in the third direction Z can be but is not limited to 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 20mm, 30mm, 40mm, 50mm, 60mm, 70mm, 80mm, 90mm, 100mm, 150mm, 250mm, 350mm, 450mm, 500mm, 1000mm, etc.

[0182] In some examples, the outer surface of the housing 10 includes two third surfaces 13, the two first surfaces 11 are oppositely arranged along the first direction X, the two third surfaces 13 are oppositely arranged along the second direction Y, the second surface 12 is located on one side of the housing 10 in the third direction Z, and the first direction X, the second direction Y, and the third direction Z are perpendicular to each other pairwise. The dimension b of the housing 10 in the third direction Z and the second dimension g satisfy the relationship: 2mm ≤ g ≤ b. Among them, the dimension b of the housing 10 in the third direction Z can be understood as the height of the housing 10.

[0183] This can prevent the protection component 30 from protruding above the housing 10 in the third direction Z, reduce the occupation of the external space of the battery cell 7 by the protection component 30, and improve the energy density and consistency of the battery cell 7.

[0184] Combined with Figure 11 andFigure 12 , in some embodiments, the fourth dimension e of the protection component 30 in the second direction Y satisfies the relationship: 0.02 mm ≤ e ≤ 200 mm.

[0185] Exemplarily, the fourth dimension e of the protection component 30 in the second direction Y can be understood as the thickness of the protection component 30. As an example, the fourth dimension e of the protection component 30 in the second direction Y can be, but is not limited to, 0.02 mm, 0.04 mm, 0.06 mm, 0.08 mm, 0.1 mm, 0.5 mm, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 50 mm, 100 mm, 150 mm, 200 mm, etc.

[0186] It can be understood that the larger the fourth dimension e of the protection component 30 in the second direction Y, the higher the structural strength of the protection component 30. At the same time, the occupancy rate of the external space of the battery cell 7 by the protection component 30 is also larger. The smaller the fourth dimension e of the protection component 30 in the second direction Y, the lower the structural strength of the protection component 30. At the same time, the occupancy rate of the external space of the battery cell 7 by the protection component 30 is also smaller.

[0187] Thus, by setting the fourth dimension e of the protection component 30 in the second direction Y within the above range, the above technical solution can improve the structural strength of the protection component 30 while taking into account the energy density of the battery cell 7.

[0188] In some embodiments, the fourth dimension e satisfies the relationship: 0.05 mm ≤ e ≤ 100 mm. This can further improve the trade-off effect between the structural strength of the protection component 30 and the energy density of the battery cell 7.

[0189] As an example, the fourth dimension e of the protection component 30 in the second direction Y can be, but is not limited to, 0.05 mm, 0.06 mm, 0.07 mm, 0.08 mm, 0.09 mm, 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 10 mm, 20 mm, 30 mm, 40 mm, 50 mm, 60 mm, 70 mm, 80 mm, 90 mm, 100 mm, etc.

[0190] According to some embodiments of the present application, the present application also provides a battery, including the battery cell 7 of any of the above solutions.

[0191] According to some embodiments of the present application, the present application also provides an electrical device, including the battery cell 7 of any of the above solutions, and the battery cell 7 is used to provide electrical energy.

[0192] To better understand the battery cell 7 provided in the embodiments of the present application, based on the same inventive concept, embodiments of the above battery cell 7 in practical applications are provided for illustration herein.

[0193] The embodiments of the present application provide a battery cell 7, which includes a housing 10, an insulating film 20, and a protection component 30. The outer surface of the housing 10 includes two first surfaces 11, a second surface 12, and a third surface 13. The two first surfaces 11 are disposed opposite to each other. The second surface 12 connects the two first surfaces 11. The third surface 13 connects the two first surfaces 11. The first surface 11, the second surface 12, and the third surface 13 intersect with each other. The insulating film 20 is integrally provided and includes a main body region 21 and a finishing region 22. The main body region 21 covers the two first surfaces 11 and the second surface 12. The finishing region 22 covers the third surface 13 and is connected to the main body region 21. The finishing region 22 includes a plurality of folded ears. The plurality of folded ears at least partially overlap. The plurality of folded ears include a first folded ear 221 and a second folded ear 222. A part of the first folded ear 221 self-folds to form a folded portion 2211 having multiple layers of the insulating film 20. The folded portion 2211 is stacked on a side of the second folded ear 222 facing away from the third surface 13, and at least a part of the crease edge 2212 of the folded portion 2211 is exposed on a surface of the second folded ear 222 facing away from the third surface 13. The protection component 30 is connected to a side of the insulating film 20 facing away from the housing 10 and covers the folded portion 2211.

[0194] Through the above technical solution, by providing the protection component 30, the protection component 30 at least covers the crease edge 2212 exposed on a surface of the second folded ear 222 facing away from the third surface 13 to seal the gap between the folded portion 2211 and the second folded ear 222, and can cut off the conduction relationship between the gap between the folded portion 2211 and the second folded ear 222 and the external environment, thereby being able to reduce the risk of insulation failure when abnormal conditions such as electrolyte leakage or thermal runaway occur in the battery cell 7, so as to improve the reliability of the battery cell 7.

[0195] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments may be combined with each other.

[0196] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the various embodiments of the present application, and they should all be covered within the scope of the claims and the specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that: include: A shell, wherein the outer surface of the shell comprises two first surfaces, a second surface and a third surface, the two first surfaces are arranged opposite to each other, the second surface connects the two first surfaces, the third surface connects the two first surfaces, and the first surface, the second surface and the third surface intersect with each other; An insulating film, integrally provided and comprising a main body region and a tail region, wherein the main body region covers the two first surfaces and the second surface, the tail region covers the third surface and is connected to the main body region, the tail region comprises a plurality of folded ears, the plurality of folded ears at least partially overlap, the plurality of folded ears comprise a first folded ear and a second folded ear, a portion of the first folded ear is self-folded to form a folded portion having multiple layers of the insulating film, the folded portion is stacked on a side of the second folded ear facing away from the third surface, and at least a portion of a folded edge of the folded portion is exposed on a side of the second folded ear facing away from the third surface; The protective component is connected to the side of the insulating film facing away from the shell and at least covers the fold edge exposed on the side of the second folded ear facing away from the third surface.

2. The battery cell according to claim 1, characterized in that: The protection member covers the folded portion.

3. The battery cell according to claim 1, characterized in that: The protection component covers the first folded ear.

4. The battery cell according to claim 1, characterized in that: The protection component includes a main body and a bent part, wherein the main body is connected to a side of the tail region facing away from the housing, and the main body at least covers the fold edge exposed on a side of the second folded ear facing away from the third surface; The bending piece extends from an edge of the main body member close to the main body area and is bent in a direction toward the main body area, and at least a portion of the bending piece is connected to the main body area.

5. The battery cell according to claim 4, characterized in that: The main body region includes two first sub-regions and a second sub-region, the two first sub-regions respectively cover the two first surfaces, and the second sub-region covers the second surface; The bending member includes a first bending portion, which extends from an edge of the main body member close to the first sub-region and bends in a direction toward the first sub-region, and at least a portion of the first bending portion is connected to the first sub-region.

6. The battery cell according to claim 5, characterized in that: The bending member includes a second bending portion, which extends from an edge of the main body member close to the second sub-region and bends in a direction toward the second sub-region, and at least a portion of the second bending portion is connected to the second sub-region.

7. The battery cell according to claim 4, characterized in that: The first dimension f of the bending part along its own extension direction satisfies the relationship: f≥0.5mm.

8. The battery cell according to claim 7, characterized in that: The first dimension f satisfies the relationship: f≥1 mm.

9. The battery cell according to claim 1, characterized in that: The outer surface of the shell includes two third surfaces, the two first surfaces are arranged opposite to each other along the first direction, the two third surfaces are arranged opposite to each other along the second direction, each third surface connects two first surfaces, the second surface is located on one side of the shell along the third direction and connects the first surface and the third surface, and the first direction, the second direction and the third direction are perpendicular to each other; The main region includes two first sub-regions and a second sub-region, the two first sub-regions respectively cover the two first surfaces, the second sub-region covers the second surface, and the insulating film includes two tail regions, the two tail regions respectively cover the two third surfaces.

10. The battery cell according to claim 9, characterized in that: Each of the tail areas includes two first folded ears and the second folded ears, the first folded ear is connected to one end of the first sub-area close to the third surface, the two first folded ears located in the same tail area are respectively folded from the two first sub-areas toward the third surface, and the second folded ear is connected to one end of the second sub-area close to the third surface and is folded from the second sub-area toward the third surface.

11. The battery cell according to claim 9, characterized in that: Each of the tail areas includes the first folded ear and two second folded ears, the first folded ear is connected to one end of the second sub-area close to the third surface, and is folded relatively from the second sub-area toward the third surface, the second folded ear is connected to one end of the first sub-area close to the third surface, and the two second folded ears located in the same tail area are folded relatively from the two first sub-areas toward the third surface respectively.

12. The battery cell according to claim 9, characterized in that: A second dimension g of the protection component along the third direction and a third dimension d of the folded portion along the third direction satisfy the relationship: gd≥1 mm.

13. The battery cell according to claim 12, characterized in that: The third dimension d and the second dimension g satisfy the relationship: gd≥2mm.

14. The battery cell according to claim 9, characterized in that: A fourth dimension e of the protection component along the second direction satisfies the relationship: 0.02 mm≤e≤200 mm.

15. The battery cell according to claim 14, characterized in that: The fourth dimension e satisfies the relationship: 0.05mm≤e≤100mm.

16. A battery, characterized in that: The invention comprises a plurality of battery cells according to any one of claims 1 to 15.

17. An electrical device, characterized in that: The invention comprises a battery cell as claimed in any one of claims 1 to 15, wherein the battery cell is used to provide electrical energy.

Images