Battery monomer, battery device and electric equipment

Abstract

The utility model discloses a battery monomer, a battery device and electric equipment, and relates to the technical field of battery manufacturing. Each single battery comprises a battery cell shell, a naked battery cell, a top cover and an insulating film, the battery cell shell is arranged to be a rectangular body or a rounded rectangular body, and an accommodating cavity of the battery cell shell is provided with a cavity opening for accommodating the naked battery cell; the edge of the top cover is connected with the opening of the cavity, and at least one of a first pole, a second pole and an anti-explosion valve is arranged on the top cover; the insulating film comprises a film top part, the film top part is provided with a film body opening, and the film top part is attached to the top cover; projection is conducted in the thickness direction of the top cover, the edge of the opening of the film body is located within the edge of the top cover, the top cover is provided with a long edge and a short edge, and the long edge is longer than the short edge; the first distance is formed between the edge of the film body opening and the long edge, the second distance is formed between the film body opening and the short edge, and the second distance is larger than the first distance, so that the attaching area of the film top part at the short edge of the top cover is increased, and the risk that the film top part is turned up and warped is reduced.

Description

Technical Field

[0001] This application relates to the field of battery manufacturing technology, and in particular to a battery cell, battery device and electrical equipment. Background Technology

[0002] In the battery manufacturing process, an insulating film (often called a blue film) needs to be wrapped around the battery casing containing the bare cells to meet the protection requirements such as insulation between battery cells.

[0003] After a certain period of time has passed since the insulation film was applied, the insulation film on some individual battery cells may curl up at the top cover, which is not conducive to subsequent assembly processes such as attaching pressure strips between battery cells. Utility Model Content

[0004] The main purpose of this application is to provide a battery cell, battery device, and electrical equipment that aims to reduce the risk of edge curling.

[0005] To achieve the above objectives, the battery cell proposed in this application includes a cell casing, a bare cell, a top cover, and an insulating film. The cell casing is configured as a rectangular or rounded rectangular body, and has a receiving cavity with a cavity opening. The bare cell is housed within the receiving cavity. The edge of the top cover is connected to the edge of the cavity opening, and the top cover is provided with at least one of a first terminal post, a second terminal post, and an explosion-proof valve. The insulating film includes a top portion, which is attached to the top cover. The top portion has a film opening projected along the thickness direction of the top cover, and the edge of the film opening is located within the edge of the top cover. The top cover has a long side and a short side, with the length of the long side being greater than the length of the short side. The edge of the film opening is at a first distance from the long side, and the film opening is at a second distance from the short side, with the second distance being greater than the first distance.

[0006] When the battery cell proposed in this application is in use, since the edge of the membrane opening is located inside the edge of the top cover, and the second distance from the edge of the membrane opening to the short side is greater than the first distance from the edge of the membrane opening to the long side, it is beneficial to increase the bonding area of ​​the top part of the membrane at the short side of the top cover, which helps to reduce the risk of edge flipping and lifting.

[0007] Optionally, the insulating film includes two opposing first side planes and two opposing second side planes, the area of ​​the first side plane is larger than the area of ​​the second side plane, the first first side plane, the first second side plane, the second first side plane and the second second side plane are arranged sequentially along the direction surrounding the top portion of the film, so that the insulating film covers the outer periphery of the battery cell shell; the first side plane is parallel to the long side, and the second side plane is parallel to the short side; the insulating film has a splice seam, which is located at at least one of the first side plane, the second side plane and the junction of the first side plane and the second side plane.

[0008] At this time, the seam of the insulating film is located on at least one of the first side plane, the second side plane, and the connection between the first side plane and the second side plane, which allows the top part of the film to be attached to the top cover first, and then the other parts of the insulating film to be attached to the side of the cell shell to form a seam, which helps to improve the overall efficiency of attaching the insulating film to the cell shell.

[0009] Optionally, the insulating film further includes two first extension pieces and two second extension pieces, the first extension pieces and the second extension pieces being connected to the edge of the top portion of the film respectively; the first first extension piece, the first second extension piece, the second first extension piece and the second second extension piece are arranged sequentially along the direction surrounding the top portion of the film to cover the outer periphery of the battery cell housing; the first extension pieces and the second extension pieces are respectively attached to the outer side of the battery cell housing and form a first side plane and a second side plane respectively, and the splice seam is located at the connection between the first side plane and the second side plane.

[0010] At this time, the first extension piece and the second extension piece are respectively attached to the outer side of the battery cell casing and form the first side plane and the second side plane respectively, which helps to further improve the overall efficiency of the insulating film being attached to the battery cell casing.

[0011] Optionally, the insulating film further includes two first extension pieces spaced apart along the direction surrounding the top portion of the film, the first extension pieces being connected to the edge of the top portion of the film; along the direction surrounding the top portion of the film, the edge of the first extension piece is provided with a first bending piece; the first extension piece is attached to the outer side of the cell housing and forms a first side plane, the first bending piece is attached to the outer side of the cell housing and forms a second side plane; the aforementioned splicing seam is formed on the first bending piece, the splicing seam is located on the second side plane or the splicing seam is located at the junction of the first side plane and the second side plane.

[0012] At this time, since the first extension piece is used to form a first side plane with a large area, a first bending piece is provided at the edge of the first extension piece. Before the insulating film is attached to the battery cell shell, the overall dispersion of the insulating film can be reduced, and the risk of the insulating film tearing is reduced.

[0013] Optionally, the first first extension sheet, the membrane top portion, and the second first extension sheet are respectively provided with a first first bending piece, a connecting piece, and a second first bending piece on the edge of the same side, and the two sides of the connecting piece are respectively connected to the first first bending piece and the second first bending piece.

[0014] At this point, the overall connection strength of the first bent piece is higher, further reducing the risk of the insulation film tearing.

[0015] Optionally, the width direction of the first first bent piece, the width direction of the connecting piece, and the width direction of the second first bent piece are perpendicular to the arrangement direction of the first first extension piece, the top portion of the membrane, and the second first extension piece, respectively, and at least some of the connecting pieces have a width smaller than the width of the first first bent piece or the width of the second first bent piece.

[0016] At this point, the width of at least some of the connecting pieces is smaller than the width of the first bending piece or the width of the second bending piece, which helps to reduce the stacking interference of the connecting pieces on the first bending piece and the second bending piece, and helps to improve the bonding efficiency of the insulating film to the battery cell shell.

[0017] Optionally, a notch is provided on the side of the connecting piece away from the top portion of the membrane, so that the width of at least part of the connecting piece is less than the width of the first first bend or the width of the second first bend.

[0018] At this point, by using a notch to make the width of at least some of the connecting pieces smaller than the width of the first bending piece or the width of the second bending piece, it is beneficial to improve the preparation efficiency of the insulating film by using the notch.

[0019] Optionally, a second bending piece is provided at the end of the first extension piece away from the top of the membrane, and the second bending piece is attached to the outer side of the cell housing facing away from the top cover.

[0020] At this point, the insulating film can provide insulation protection to the outer side of the battery cell casing facing away from the top cover through the second bending piece, thereby improving the overall insulation protection efficiency.

[0021] Optionally, the battery cell also includes a bottom patch, which is attached to the outer side of the cell housing facing away from the top cover; the bottom patch and the insulating film are separately formed, and the bottom patch is connected to the first extension piece.

[0022] At this point, by molding the base patch and the insulating film separately, it is beneficial to improve the overall manufacturing efficiency through the parallel preparation of the base patch and the insulating film.

[0023] Optionally, the second distance is greater than or equal to 5 millimeters.

[0024] At this point, a second distance of 5 millimeters or more helps to further reduce the risk of edge curling.

[0025] Optionally, the second distance is greater than or equal to 6 millimeters.

[0026] At this point, a second distance of 6 millimeters or more helps to further reduce the risk of edge curling.

[0027] Optionally, the thickness direction of the cell casing is parallel to the short side, and the thickness of the cell casing is less than or equal to 55 mm.

[0028] At this point, when the thickness of the cell casing is less than or equal to 55 mm, the battery cell is relatively flat, and the top part of the film can still maintain a good fit with the top cover.

[0029] Optionally, the thickness of the cell casing is less than or equal to 45 mm.

[0030] At this point, when the thickness of the cell casing is less than or equal to 45 mm, the battery cell is relatively flat, and the top part of the film can still maintain a good fit with the top cover.

[0031] Optionally, the top portion of the membrane is designed to be integrally molded.

[0032] At this point, since the top part of the membrane is designed to be integrally molded, the edge of the membrane opening can be integrated as a whole and form a complete circumferential fit with the top cover. This allows the top part of the membrane to fit well with the top cover, which helps to further reduce the risk of the top part of the membrane flipping up.

[0033] Optionally, the battery cell also includes a top patch, which is separately formed from the insulating film. The edge of the top patch is connected to the edge of at least part of the film opening. The top patch is provided with at least two patch through holes. Projected along the thickness direction of the top cover, the at least two patch through holes are provided in a one-to-one correspondence with at least two of the first electrode, the second electrode, and the explosion-proof valve.

[0034] At this point, the top patch can enhance the insulation protection at the opening of the membrane, and the separate molding of the top patch and the insulating film is beneficial to improving the overall preparation efficiency.

[0035] Optionally, the top cover is provided with at least two of a first pole, a second pole, and an explosion-proof valve, wherein at least two of the first pole, the second pole, and the explosion-proof valve are located within the same membrane opening.

[0036] At this point, at least two of the first electrode, the second electrode, and the explosion-proof valve are located within the same membrane opening, which helps to reduce the number of membrane openings and improve preparation efficiency.

[0037] This application also proposes a battery device, which includes a battery housing and the aforementioned battery cells, with the battery cells housed within the battery housing.

[0038] When the battery device proposed in this application is in use, since the edge of the membrane opening is located inside the edge of the top cover, and the second distance from the edge of the membrane opening to the short side is greater than the first distance from the edge of the membrane opening to the long side, it is beneficial to increase the bonding area of ​​the top part of the membrane at the short side of the top cover, which helps to reduce the risk of edge flipping and lifting.

[0039] This application also proposes an electrical device that includes the aforementioned battery device.

[0040] When the electrical equipment proposed in this application is in use, since the edge of the membrane opening is located inside the edge of the top cover, and the second distance from the edge of the membrane opening to the short side is greater than the first distance from the edge of the membrane opening to the long side, it is beneficial to increase the bonding area of ​​the membrane top part at the short side of the top cover, which helps to reduce the risk of edge flipping and lifting. Attached Figure Description

[0041] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0042] Figure 1 This is a schematic diagram of the structure of an embodiment of the electrical equipment provided in this application;

[0043] Figure 2 A schematic diagram of the structure of an embodiment of the battery device provided in this application;

[0044] Figure 3 A perspective view of an embodiment of a battery cell provided in this application;

[0045] Figure 4 A perspective view of the insulating film in one embodiment of the battery cell provided in this application;

[0046] Figure 5 This is a schematic diagram of the flattening of the insulating film in one embodiment of this application;

[0047] Figure 6 This is a schematic diagram of the flattened insulating film in another embodiment of this application.

[0048] Explanation of icon numbers:

[0049] 10. Electrical equipment; 20. Battery devices; 30. Battery cells / assemblies;

[0050] 21. Battery housing; 211. First housing; 212. Second housing;

[0051] 100. Battery cell; 111. First terminal; 112. Second terminal; 113. Explosion-proof valve;

[0052] 120. Insulating film; 121. Top portion of the film; 122. Opening of the film body;

[0053] 123. First side plane; 124. Second side plane;

[0054] 125. First extension sheet; 126. Second extension sheet;

[0055] 127. First bending piece; 128. Second bending piece; 129. Connecting piece; 1291. Notch;

[0056] 130. Top mount; 131. Mount via.

[0057] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0058] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0059] It should be noted that if the embodiments of this application involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0060] Furthermore, if the embodiments of this application involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0061] In the battery manufacturing process, an insulating film (often called a blue film) needs to be wrapped around the battery casing containing the bare cells to meet the protection requirements such as insulation between battery cells.

[0062] After a certain period of time has passed since the insulation film was applied, the insulation film on some individual battery cells may curl up at the top cover, which is not conducive to subsequent assembly processes such as attaching pressure strips between battery cells.

[0063] The related technologies employ various methods for applying the insulating film, including annular wrapping (covering all four sides of the battery cell casing) or U-shaped wrapping (covering the four sides and bottom of the battery cell casing). The film is then bonded to the top cover via a top flange. Before the flange is applied, the height of the insulating film corresponding to the long and short sides of the top cover is consistent. When the thickness of the battery cell and its casing is relatively small, the space occupied by the terminals (positive and negative terminals) on the top cover is relatively large; the overall bonding area of ​​the insulating film corresponding to the long side of the top cover is large, reducing the risk of lifting. However, the overall bonding area of ​​the insulating film corresponding to the short side of the top cover is smaller, sometimes leading to edge lifting. In other words, to improve the efficiency of the insulating film application, the related technologies typically use the aforementioned annular or U-shaped wrapping methods, ensuring that the coverage width of the insulating film is consistent along the long and short sides of the top cover. This can easily lead to a reduction in the bonding area of ​​the insulating film at the short side of the top cover, resulting in edge lifting.

[0064] Based on the above considerations, in order to reduce the risk of edge lifting, this application proposes a battery cell, a battery device, and an electrical device. In use, the battery cell, battery device, and electrical device can increase the bonding area at the short side of the top cover for better adhesion to the top cover, and can reduce the number of openings in the membrane, thereby improving manufacturing efficiency.

[0065] The structure of the battery cell, battery device, and electrical equipment proposed in this application will be explained and described in detail below with specific implementation methods.

[0066] Among them, reference Figure 1 The electrical device 10 provided in this application includes a battery device 20. The electrical device 10 may include, but is not limited to, mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships, and spacecraft, wherein spacecraft include airplanes, rockets, space shuttles, and spacecraft.

[0067] Among them, reference Figure 2 and Figure 3The battery device 20 includes a battery housing 21 and battery cells 100, with the battery cells 100 housed within the battery housing 21. The battery device 20 (Battery Apparatus) mentioned in the embodiments of this application may include one or more battery cell assemblies 30 for providing voltage and capacity. A battery cell assembly 30 may include multiple battery cells 100, which are connected in series, parallel, or mixed connections via busbar components. The battery cell assembly 30 may be a battery module, which is formed by arranging and fixing multiple battery cells into a single module. For example, a battery module can be formed by bundling multiple battery cells 100 together with cable ties. In some embodiments, the battery cell assembly 30 may be housed within the battery housing 21 by fixing it to the battery housing 21. As an example, the battery cell assembly 30 may also be housed within the battery housing 21 by directly fixing multiple battery cells 100 to the battery housing 21. Of course, the battery cell assembly 30 may also include only one battery cell 100, and this embodiment does not limit this.

[0068] In some embodiments, the battery housing 21 may include a first housing 211 and a second housing 212. The first housing 211 and the second housing 212 are fastened together, thereby forming a closed space inside the battery housing 21 to accommodate the aforementioned battery cells 100 or battery cell assemblies 30. Here, "closed" refers to covering or shutting off, and can be either sealed or unsealed. Furthermore, the first housing 211 may be a top cover or a bottom plate; the battery housing 21 may include a top cover, a frame, and a bottom plate, with the top cover and bottom plate respectively connected to the frame, thereby forming the aforementioned closed space inside the battery housing 21 to accommodate the aforementioned battery cells 100 or battery cell assemblies 30.

[0069] In some embodiments, the battery housing 21 may be part of the chassis structure of the vehicle, the electrical device 10. For example, the top cover of the battery housing 21 may be at least part of the vehicle floor, or the frame of the battery housing 21 may be at least part of the vehicle's crossbeams and longitudinal beams.

[0070] In some embodiments, the battery device 20 may also refer to an energy storage device, which includes a battery housing 21, and at least one side of the battery housing 21 has a door. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0071] Reference Figure 3 and Figure 4 In one embodiment of this application, the battery cell 100 includes a cell casing, a bare cell, a top cover, and an insulating film 120; wherein, Figure 3 A perspective view of the battery cell 100 in this embodiment is shown. Figure 4 A perspective view of the insulating film 120 of the battery cell 100 in this embodiment is shown.

[0072] Specifically, the battery cell casing is configured as a rectangular or rounded rectangular shape; furthermore, the battery cell casing has a receiving cavity with a cavity opening, and the bare battery cell is received within the receiving cavity; the edge of the top cover is connected to the edge of the cavity opening, and the top cover is provided with at least one of a first terminal post 111, a second terminal post 112, and an explosion-proof valve 113; the insulating film 120 includes a film top portion 121, which is attached to the top cover; the film top portion 121 has a film opening 122 that projects along the thickness direction of the top cover, for example along... Figure 3 Projecting the membrane opening 122 in the vertical direction, the edge of the membrane opening 122 is located inside the edge of the top cover; the top cover has a long side and a short side, the length of the long side is greater than the length of the short side; the edge of the membrane opening 122 is at a first distance A1 to the long side, and the membrane opening 122 is at a second distance A2 to the short side, the second distance A2 is greater than the first distance A1.

[0073] The battery cell casing is typically made of metallic materials, such as aluminum alloy or titanium alloy. The first terminal 111 and the second terminal 112 can be the positive and negative terminals, respectively. Figure 3 In the illustrated embodiment, the top cover is simultaneously provided with a first pole 111, a second pole 112, and an explosion-proof valve 113; of course, the top cover may also provide one or both of the first pole 111, the second pole 112, and the explosion-proof valve 113. In other embodiments, the explosion-proof valve 113 may be located at the bottom of the battery cell casing or similar position. The top cover as a whole may be made of metal material, and the edge of the cavity opening of the battery cell casing may be connected to the edge of the top cover by welding or other means; it is understood that the top cover may be located above the direction of gravity, or it may be located below the direction of gravity, and this embodiment does not limit this. The insulating film 120 can be understood as a film layer made of insulating material, such as PET film, PI film, etc. Since the insulating film 120 is usually blue, it is often also called blue film. In some embodiments, unlike the insulating film 120 that covers at least a portion of the battery cell casing (which can be understood as covering the outside of the battery cell casing), a membrane layer for insulating protection can be provided between the bare battery cell and the inner peripheral wall of the battery cell casing. This membrane layer is usually made of polyester polymer material (Mylar) and is therefore usually called Mylar film.

[0074] The insulating film 120 includes a top portion 121, which can be integrally formed, meaning that the top portion 121 does not need to be spliced ​​during the process of attaching the insulating film 120 to the battery cell casing. Alternatively, the top portion 121 can be formed in parts, such as by splicing individual film pieces; this embodiment does not limit this. The top portion 121 is attached to the top cover, specifically by adhesive bonding or heat fusion, for example, the top portion 121 is bonded to the top cover or heat-fused to the top cover. The edge of the film opening 122 is located within the edge of the top cover, as shown in the figure. Figure 4 This can be understood as the membrane top portion 121 having a complete ring of solid portion on the top cover, and this complete ring of solid portion being fitted to the top cover, wherein this complete ring of solid portion refers to... Figure 4 The dimensions A1 and A2 are shown in the figure.

[0075] With at least two of the first pole post 111, the second pole post 112, and the explosion-proof valve 113 provided on the top cover, at least two of the first pole post 111, the second pole post 112, and the explosion-proof valve 113 can be located in the same membrane opening 122. It can be understood that the overall area of ​​the membrane opening 122 is large, which can simultaneously accommodate at least two of the first pole post 111, the second pole post 112, and the explosion-proof valve 113. For example, it can simultaneously accommodate the first pole post 111 and the second pole post 112, or simultaneously accommodate the first pole post 111, the second pole post 112, and the explosion-proof valve 113, thereby helping to reduce the number of membrane openings 122 and improve the preparation efficiency.

[0076] Reference Figure 3 and Figure 4 The cell casing can be configured as a rounded rectangle, such as a cuboid with rounded edges; of course, the cell casing can also be configured as a rectangle, such as a cuboid, and this embodiment is not limited to this; furthermore, the battery cell 100 can be configured as a prismatic battery or a blade battery. (Refer to...) Figure 3 and Figure 4 In some implementation methods, refer to Figure 4 The insulating film 120 may include two oppositely arranged first side planes 123 and two oppositely arranged second side planes 124. The area of ​​the first side plane 123 is larger than the area of ​​the second side plane 124. The first first side plane 123, the first second side plane 124, the second first side plane 123 and the second second side plane 124 are arranged sequentially along the direction surrounding the top portion 121 of the film, so that the insulating film 120 covers the outer periphery of the battery cell shell. The first side plane 123 is parallel to the long side of the top cover, and the second side plane 124 is parallel to the short side of the top cover.

[0077] Among them, reference Figure 4The two opposing first side planes 123 can be respectively designated as the front and rear sides in the figure, and the two opposing second side planes 124 can be respectively designated as the left and right sides in the figure. The area of ​​the first side plane 123 is larger than the area of ​​the second side plane 124, which can be understood as the first side plane 123 being a large plane and the second side plane 124 being a small plane. The direction in which the first first side plane 123, the first second side plane 124, the second first side plane 123, and the second second side plane 124 surround the membrane top portion 121 can be understood by referring to the direction of the dashed arrow in the figure, which can be understood as the first first side plane 123, the first second side plane 124, the second first side plane 123, and the second second side plane 124 being arranged along the circumferential direction of the membrane top portion 121. It is understandable that, since the insulating film 120 is usually thin, the first distance A1 from the edge of the film opening 122 to the long side can also be understood as the distance from the edge of the film opening 122 to the first side plane 123, and the second distance A2 from the film opening 122 to the short side can also be understood as the distance from the edge of the film opening 122 to the second side plane 124.

[0078] As can be seen from the above description, when the battery cell 100 in this embodiment is in use, since the edge of the membrane opening 122 is located inside the edge of the top cover, and the second distance A2 from the edge of the membrane opening 122 to the short side is greater than the first distance A1 from the edge of the membrane opening 122 to the long side, it is beneficial to increase the bonding area of ​​the membrane top portion 121 at the short side of the top cover, which is beneficial to reduce the risk of the membrane top portion 121 flipping up.

[0079] In the embodiment where the membrane top portion 121 is integrally formed, the edge of the membrane opening 122 can be integrated and connected to the top cover in a full circle, so that the membrane top portion 121 can be well fitted to the top cover, which helps to reduce the risk of the membrane top portion 121 flipping up.

[0080] In some implementations, refer to Figure 3 The battery cell 100 may further include a top patch 130, wherein the top patch 130 may be made of an insulating material. The top patch 130 may be separately formed from the insulating film 120, and the edge of the top patch 130 is connected to the edge of at least a portion of the film opening 122, for example... Figure 3 and Figure 4 The edge of the top patch 130 overlaps the edge of the membrane opening 122, and... Figure 3In section A2, the edge of the top patch 130 at dimension A2 forms a gap with the edge of the membrane opening 122, facilitating direct adhesion of the adhesive strip to the top cover in subsequent assembly processes. Alternatively, the edge of the top patch 130 can be seamlessly connected to the edge of the membrane opening 122, effectively eliminating the gap and improving insulation performance at the short side of the top cover. In this case, the insulating film 120 at the short side of the top cover provides greater adhesive force due to its larger bonding area. Furthermore, the top patch 130 can be fixedly connected to the top cover or to the top portion 121 of the membrane, achieved through methods such as bonding or heat fusion. (Continue referring to...) Figure 3 The top patch 130 may have at least two patch vias 131, for example... Figure 3 The top patch 130 has three patch through holes 131; projected along the thickness direction of the top cover, for example along... Figure 3 Projecting in the vertical direction, at least two patch through holes 131 are configured to correspond one-to-one with at least two of the first pole post 111, the second pole post 112 and the explosion-proof valve 113. For example, each patch through hole 131 respectively accommodates at least a part of the first pole post 111, at least a part of the second pole post 112 and at least a part of the explosion-proof valve 113.

[0081] In this embodiment, the top patch 130 enhances the insulation protection at the membrane opening 122, and the separate molding of the top patch 130 and the insulating film 120 improves the overall manufacturing efficiency. It can be understood that the membrane top portion 121 can improve manufacturing efficiency by opening a membrane opening 122 with a larger area, and the top patch 130 further enhances the insulation protection at the membrane opening 122.

[0082] In some embodiments, the insulating film 120 has a seam located on at least one of the first side plane 123, the second side plane 124, and the junction of the first side plane 123 and the second side plane 124. This can be understood as at least a portion of the seam being located on the side surface, and a portion of the seam may also be located on the bottom surface. The seam may be formed by overlapping two edges of the insulating film 120, or by two adjacent edges of the insulating film 120; alternatively, the seam may be formed by a small gap between the two edges of the insulating film 120.

[0083] Among them, reference Figure 5 In some embodiments, the insulating film 120 further includes two first extension sheets 125 and two second extension sheets 126, wherein Figure 5A flattened schematic diagram of one embodiment of the insulating film 120 is shown. In this embodiment, the first extension piece 125 and the second extension piece 126 are respectively connected to the edge of the top portion 121 of the film. The first extension piece 125 and the second extension piece 126 can be configured to be integrally formed with the top portion 121 of the film. The first first extension piece 125, the first second extension piece 126, the second first extension piece 125, and the second second extension piece 126 are sequentially arranged along the direction surrounding the top portion 121 to cover the outer periphery of the battery cell casing. It can be understood that the unfolded insulating film 120 is generally petal-shaped or cross-shaped. The boundary between the first first extension piece 125, the first second extension piece 126, the second first extension piece 125, and the second second extension piece 126 and the top portion 121 is referenced. Figure 5 As shown by the dashed line, this dashed line can also be understood as a crease line.

[0084] The first extension piece 125 and the second extension piece 126 are respectively attached to the outer surface of the battery cell casing, forming a first side plane 123 and a second side plane 124 respectively. This attachment can be achieved by adhesive bonding or heat fusion bonding. The seam is located at the junction of the first side plane 123 and the second side plane 124, which can be understood as the seam being located at the edge of the side of the battery cell casing. Correspondingly, after the insulating film 120 is attached to the battery cell casing, the first first extension piece 125, the first second extension piece 126, the second first extension piece 125, and the second second extension piece 126 are respectively located at... Figure 3 , Figure 4 The front, right, back, and left sides of the middle.

[0085] In this embodiment, the first extension piece 125 and the second extension piece 126 are respectively attached to the outer side of the battery cell casing and form the first side plane 123 and the second side plane 124 respectively, which is beneficial to further improve the overall efficiency of the insulating film 120 being attached to the battery cell casing.

[0086] In addition, refer to Figure 4 and Figure 6 In other embodiments, the insulating film 120 further includes two first extensions 125 spaced apart along a direction surrounding the top portion 121 of the film, for example... Figure 6 Two first extension sheets 125 are respectively disposed on the upper and lower sides of the membrane top portion 121, wherein the direction along the perimeter of the membrane top portion 121 is referenced to Figure 4 The direction of the dashed arrow; the first extension piece 125 connects to the edge of the membrane top portion 121; wherein, the boundaries of each of the two first extension pieces 125 with the membrane top portion 121 are referenced. Figure 6 As shown by the two horizontal dashed lines in the middle, these horizontal dashed lines can be understood as crease lines.

[0087] Correspondingly, after the insulating film 120 is attached to the cell casing, the two first extension pieces 125 are respectively located at Figure 3 , Figure 4 The front and rear sides of the membrane. Furthermore, along the direction surrounding the membrane top portion 121, for example along... Figure 4 The direction of the dashed arrow in the middle or along Figure 6 In the left-right direction, the edge of the first extension piece 125 is provided with a first bent piece 127, wherein the top portion 121, the first extension piece 125, and the first bent piece 127 can be integrally formed; the first extension piece 125 is attached to the outer side of the cell shell and forms a first side plane 123, and the first bent piece 127 is attached to the outer side of the cell shell and forms a second side plane 124; the first bent piece 127 can be understood as a portion of the insulating film 120 that is bent and attached to the cell shell to form the second side plane 124. The boundary of the first bent piece 127 is referenced... Figure 6 The vertical dashed lines on the left and right sides are shown. Correspondingly, the splicing seam is formed on the first bending piece 127. It can be understood that the first bending piece 127 forms a splicing seam on the side of the battery cell casing. The splicing seam is located on the second side plane 124 or at the junction of the first side plane 123 and the second side plane 124.

[0088] In this embodiment, refer to Figure 6 Since the first extension piece 125 is used to form a first side plane 123 with a large area, a first bending piece 127 is provided at the edge of the first extension piece 125. Before the insulating film 120 is attached to the battery cell housing, the overall dispersion of the insulating film 120 can be reduced, and the risk of the insulating film 120 being torn is reduced.

[0089] According to the above, for Figure 5 , Figure 6 As can be seen from the two embodiments described, the seam of the insulating film 120 is located on at least one of the first side plane 123, the second side plane 124, and the connection between the first side plane 123 and the second side plane 124. This allows the top portion 121 of the film to be first attached to the top cover, and then the other parts of the insulating film 120 to be attached to the side of the battery cell housing to form a seam, which is beneficial to improving the overall efficiency of attaching the insulating film 120 to the battery cell housing.

[0090] Reference Figure 6 In some embodiments, the first first extension piece 125, the membrane top portion 121, and the second first extension piece 125 are respectively provided with a first first bending piece 127, a connecting piece 129, and a second first bending piece 127 on the edge of the same side (e.g., the left and right sides in the figure). The two sides of the connecting piece 129 (e.g., the upper and lower sides in the figure) are respectively connected to the first first bending piece 127 and the second first bending piece 127. The partial boundary of the first bending piece 127 is referenced... Figure 6 The vertical dashed lines on the left and right sides are shown in the figure.

[0091] In this embodiment, the overall connection strength of the insulating film 120 is higher. This can be understood as the overall connection strength between the first first extension piece 125, the top portion 121, the second first extension piece 125, the first bending piece 127, and the connecting piece 129 is higher, which further reduces the risk of the insulating film 120 tearing.

[0092] In some implementations, reference continues. Figure 6 The width directions of the first first bent piece 127, the connecting piece 129, and the second first bent piece 127 are perpendicular to the arrangement directions of the first first extension piece 125, the membrane top portion 121, and the second first extension piece 125, respectively. For example, the width directions of the first first bent piece 127, the connecting piece 129, and the second first bent piece 127 are respectively set along the left and right directions in the figure; at least some of the connecting pieces 129 have a width W2 that is smaller than the width W1 of the first first bent piece 127 or the width W3 of the second first bent piece 127.

[0093] In some implementations, refer to Figure 6 A notch 1291 can be provided on the side of the connecting piece 129 away from the membrane top portion 121, so that the width W2 of at least part of the connecting piece 129 is smaller than the width W1 of the first first bent piece 127 or the width W3 of the second first bent piece 127. The notch 1291 can be configured as a rectangular notch, an arc notch, or other shapes.

[0094] In this embodiment, the notch 1291 makes the width W2 of at least a portion of the connecting piece 129 smaller than the width W1 of the first first bent piece 127 or the width W3 of the second first bent piece 127, which is beneficial to improve the preparation efficiency of the insulating film 120.

[0095] As can be seen from the above description, at least some of the connecting pieces 129 have a width smaller than the width W1 of the first first bent piece 127 or the width W3 of the second first bent piece 127. This helps to reduce the stacking interference of the connecting pieces 129 on the first first bent piece 127 and the second first bent piece 127. It can be understood that the overlap volume of the first first bent piece 127 and the second first bent piece 127 after bonding is smaller, which helps to improve the bonding efficiency of the insulating film 120 to the battery cell shell.

[0096] In some implementations, refer to Figure 6The first extension piece 125 has a second bent piece 128 at one end away from the top portion 121 of the membrane. The first extension piece 125 and the second bent piece 128 can be integrally formed. The second bent piece 128 is attached to the outer side of the cell casing facing away from the top cover. The second bent piece 128 is referenced to... Figure 6 The horizontal dashed line on the outer side of the middle section can be interpreted as the crease line of the second bending piece 128.

[0097] In this embodiment, the insulating film 120 can provide insulation protection to the outer side of the battery cell housing facing away from the top cover through the second bending piece 128, which can be understood as protecting the bottom of the battery cell housing, thereby improving the overall insulation protection efficiency.

[0098] Of course, in some alternative embodiments, the battery cell 100 also includes a bottom patch, which is attached to the outer side of the cell housing facing away from the top cover, for example by adhesive bonding or hot-melt bonding; the bottom patch and the insulating film 120 are separately formed, which can be understood as each being formed separately and then connected; the bottom patch is connected to the first extension piece 125, for example by overlapping or other means.

[0099] In this embodiment, by forming the base patch and the insulating film 120 separately, it is beneficial to improve the overall manufacturing efficiency by preparing the base patch and the insulating film 120 in parallel.

[0100] In some implementations, refer to Figure 4 Regarding the above, the edge of the membrane opening 122 has a first distance A1 to its long side, and the edge of the membrane opening 122 has a second distance A2 to its short side, and the first distance A1 is less than the second distance A2, which can make the length of the battery cell casing ( Figure 4 The dimension in the left-right direction) minus twice A2 equals the length of the membrane opening 122. Figure 4 Dimensions in the left-right direction), width of the cell casing ( Figure 4 The dimension in the front-to-back direction) minus twice A1 equals the width of the membrane opening 122. Figure 4 (Dimensions in the front-to-back direction).

[0101] In some implementations, refer to Figure 4 The thickness direction of the battery cell casing is parallel to the short side; for example, the thickness direction of the battery cell casing is along... Figure 4 The front and rear orientation is set in the middle, and the thickness D1 of the cell shell is less than or equal to 55 mm. This can be understood as the thickness of the battery cell 100 being less than or equal to 55 mm, which can be understood as the battery cell 100 being relatively flat. However, at this time, the top part 121 of the film can still maintain a good fit with the top cover.

[0102] Furthermore, the thickness D1 of the cell casing is less than or equal to 45 mm, which can be understood as the battery cell 100 being flatter, but the top part 121 of the film can still maintain a good fit with the top cover.

[0103] In some implementations, refer to Figure 4 The aforementioned second distance A2 can be set to be greater than or equal to 5 mm, which helps to further reduce the risk of edge curling. Specifically, the first pole post 111 and the second pole post 112 are usually arranged along the arrangement direction of the two second side planes 124 (the left and right direction in the figure), so that the usable space from the first pole post 111 and the second pole post 112 to the second side plane 124 is larger in the arrangement direction of the two second side planes 124 (the left and right direction in the figure), which makes it easier to increase the aforementioned second distance A2.

[0104] Furthermore, the second distance mentioned above can be set to greater than or equal to 6 millimeters, which will help to further reduce the risk of edge curling.

[0105] Reference Figures 3 to 6In some embodiments, the battery cell 100 includes a cell casing, a bare cell, a top cover, and an insulating film 120. The cell casing has a receiving cavity with a cavity opening, and the bare cell is received within the receiving cavity. The edge of the top cover is connected to the edge of the cavity opening, and the top cover is provided with at least two of a first terminal post 111, a second terminal post 112, and an explosion-proof valve 113. The insulating film 120 covers at least a portion of the cell casing. The insulating film 120 includes an integrally formed top portion 121 with a film opening 122, and the top portion 121 is attached to the top cover. Projected along the thickness direction of the top cover, the edge of the film opening 122 is located within the edge of the top cover. The top cover has a long side and a short side, and the length of the long side is greater than the length of the short side. The edge of the film opening 122 is at a first distance A1 to the long side, and the film opening 122 is at a second distance A2 to the short side, and the second distance A2 is greater than the first distance A1. At least two of the first terminal 111, the second terminal 112, and the explosion-proof valve 113 are located within the same membrane opening 122. The battery cell 100 also includes a top patch 130, which is separately formed from the insulating film 120. The edge of the top patch 130 is connected to the edge of the membrane opening 122, and the top patch 130 is provided with at least two patch through holes 131. Projected along the thickness direction of the top cover, the at least two patch through holes 131 are respectively provided with at least two of the first terminal 111, the second terminal 112, and the explosion-proof valve 113. The battery cell casing is configured as a rectangular or rounded rectangle. The insulating film 120 includes two opposing first side planes 123 and two opposing second side planes 124. The area of ​​the first side plane 123 is larger than the area of ​​the second side plane 124. The first first side plane 123, the first second side plane 124, the second first side plane 123, and the second second side plane 124 are sequentially arranged along the direction surrounding the top portion 121 of the film so that the insulating film 120 covers the outer periphery of the battery cell casing. The first side plane 123 is parallel to the long side of the top cover, and the second side plane 124 is parallel to the short side of the top cover. The insulating film 120 has a seam located at at least one of the first side plane 123, the second side plane 124, and the junction of the first side plane 123 and the second side plane 124. The battery cell casing is configured as a rectangular or rounded rectangle. The edge of the film opening 122 is at a first distance from the first side plane 123, and the edge of the film opening 122 is at a second distance from the second side plane 124. The second distance is greater than the first distance. The second distance is greater than or equal to 6 mm, and the distance between the two first side planes 123 is less than or equal to 45 mm.

[0106] The insulating film 120 also includes two first extension pieces 125 and two second extension pieces 126, which are connected to the edge of the top portion 121 of the film. The first first extension piece 125, the first second extension piece 126, the second first extension piece 125 and the second second extension piece 126 are arranged sequentially along the direction surrounding the top portion 121 to cover the outer periphery of the battery cell shell. The first extension piece 125 and the second extension piece 126 are integrally formed with the top portion 121 of the film. The first extension piece 125 and the second extension piece 126 are respectively attached to the outer side of the battery cell shell and form a first side plane 123 and a second side plane 124 respectively. The splicing seam is located at the connection between the first side plane 123 and the second side plane 124.

[0107] Alternatively, the insulating film 120 may further include two first extension pieces 125 spaced apart along the direction surrounding the top portion 121, the first extension pieces 125 being connected to the edge of the top portion 121; along the direction surrounding the top portion 121, the edge of the first extension piece 125 is provided with a first bending piece 127, the top portion 121, the first extension piece 125 and the first bending piece 127 being integrally formed; the first extension piece 125 is attached to the outer side of the cell housing and forms a first side plane 123, the first bending piece 127 is attached to the outer side of the cell housing and forms a second side plane 124; a seam is formed on the first bending piece 127, the seam is located on the second side plane 124 or the seam is located at the junction of the first side plane 123 and the second side plane 124. The first first extension piece 125, the membrane top portion 121, and the second first extension piece 125 each have a first first bending piece 127, a connecting piece 129, and a second first bending piece 127 respectively on the edge of the same side. The two sides of the connecting piece 129 are respectively connected to the first first bending piece 127 and the second first bending piece 127. The width direction of the first first bending piece 127, the width direction of the connecting piece 129, and the width direction of the second first bending piece 127 are perpendicular to the arrangement direction of the first first extension piece 125, the membrane top portion 121, and the second first extension piece 125. At least a portion of the width W2 of the connecting piece 129 is smaller than the width W1 of the first first bending piece 127 or the width W3 of the second first bending piece 127. A notch 1291 is provided on the side of the connecting piece 129 away from the membrane top portion 121, so that at least a portion of the width W2 of the connecting piece 129 is smaller than the width W1 of the first first bending piece 127 or the width W3 of the second first bending piece 127. A second bent piece 128 is provided at one end of the first extension piece 125 away from the top portion 121 of the membrane. The first extension piece 125 and the second bent piece 128 are integrally formed. The second bent piece 128 is attached to the outer side of the portion of the cell casing facing away from the top cover. The thickness direction of the cell casing is parallel to the short side, and the thickness D1 of the cell casing is less than or equal to 45 mm.

[0108] Alternatively, the battery cell 100 may also include a bottom patch, which is attached to the outer side of the cell housing facing away from the top cover; the bottom patch and the insulating film 120 are separately formed, and the bottom patch is connected to the first extension piece 125.

[0109] It is understood that since the electrical equipment 10 and the battery device 20 adopt all the technical solutions of all the above embodiments, they have at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be repeated here.

[0110] The above description is merely a preferred embodiment of this application and does not limit the patent scope of this application. Any equivalent structural transformations made based on the technical concept of this application and the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.

Claims

1. A battery cell, characterized in that, The battery cell includes: The battery cell casing is configured as a rectangular or rounded rectangular shape; the battery cell casing has a receiving cavity with a cavity opening; A bare battery cell, wherein the bare battery cell is housed within the receiving cavity; A top cover, the edge of which is connected to the edge of the cavity opening, and the top cover is provided with at least one of a first pole post, a second pole post, and an explosion-proof valve; An insulating film includes a top portion attached to a top cover; the top portion has an opening projected along the thickness direction of the top cover, and the edge of the opening is located within the edge of the top cover; the top cover has a long side and a short side, the length of the long side being greater than the length of the short side; the edge of the opening is at a first distance from the long side, and the opening is at a second distance from the short side, the second distance being greater than the first distance.

2. The battery cell as described in claim 1, characterized in that, The insulating film includes two opposing first side planes and two opposing second side planes. The area of ​​the first side plane is larger than the area of ​​the second side plane. The first first side plane, the first second side plane, the second first side plane, and the second second side plane are arranged sequentially along the direction surrounding the top portion of the film, so that the insulating film covers the outer periphery of the battery cell casing. The first side plane is parallel to the long side, and the second side plane is parallel to the short side. The insulating film has a seam located on at least one of the first side plane, the second side plane, and the junction of the first side plane and the second side plane.

3. The battery cell as described in claim 2, characterized in that, The insulating film further includes two first extension pieces and two second extension pieces, the first extension pieces and the second extension pieces being connected to the edge of the top portion of the film respectively; the first first extension piece, the first second extension piece, the second first extension piece and the second second extension piece are arranged sequentially along the direction surrounding the top portion of the film to cover the outer periphery of the cell casing; The first extension piece and the second extension piece are respectively attached to the outer side of the battery cell casing and form the first side plane and the second side plane respectively. The splicing seam is located at the connection between the first side plane and the second side plane.

4. The battery cell as described in claim 2, characterized in that, The insulating film further includes two first extension pieces spaced apart along a direction surrounding the top portion of the film, the first extension pieces being connected to the edge of the top portion of the film; along the direction surrounding the top portion of the film, the edges of the first extension pieces are provided with first bending pieces; The first extension piece is attached to the outer side of the battery cell housing and forms the first side plane; the first bent piece is attached to the outer side of the battery cell housing and forms the second side plane; the splicing seam is formed on the first bent piece, and the splicing seam is located on the second side plane or at the junction of the first side plane and the second side plane.

5. The battery cell as described in claim 4, characterized in that, The first first extension sheet, the membrane top portion, and the second first extension sheet are respectively provided with a first first bending piece, a connecting piece, and a second first bending piece on the edge of the same side, and the two sides of the connecting piece are respectively connected to the first first bending piece and the second first bending piece.

6. The battery cell as described in claim 5, characterized in that, The width direction of the first first bent piece, the width direction of the connecting piece, and the width direction of the second first bent piece are respectively perpendicular to the arrangement direction of the first first extension piece, the top portion of the membrane, and the second first extension piece. At least a portion of the width of the connecting piece is smaller than the width of the first first bent piece or the width of the second first bent piece.

7. The battery cell as described in claim 6, characterized in that, The connecting piece has a notch on the side away from the top portion of the membrane, so that at least a portion of the width of the connecting piece is smaller than the width of the first first bent piece or the width of the second first bent piece.

8. The battery cell according to any one of claims 3 to 7, characterized in that, The first extension sheet has a second bending piece at one end away from the top portion of the membrane, and the second bending piece is attached to the outer side of the cell housing facing away from the top cover.

9. The battery cell according to any one of claims 3 to 7, characterized in that, The battery cell also includes a bottom patch, which is attached to the outer side of the cell housing facing away from the top cover; the bottom patch and the insulating film are separately formed, and the bottom patch is connected to the first extension piece.

10. The battery cell according to any one of claims 1 to 7, characterized in that, The second distance is greater than or equal to 5 millimeters.

11. The battery cell as described in claim 10, characterized in that, The second distance is greater than or equal to 6 millimeters.

12. The battery cell according to any one of claims 1 to 7, characterized in that, The thickness direction of the battery cell casing is parallel to the short side, and the thickness of the battery cell casing is less than or equal to 55 mm.

13. The battery cell as described in claim 12, characterized in that, The thickness of the battery cell casing is less than or equal to 45 mm.

14. The battery cell according to any one of claims 1 to 7, characterized in that, The top portion of the membrane is designed to be integrally molded.

15. The battery cell according to any one of claims 1 to 7, characterized in that, The battery cell also includes a top patch, which is separately formed from the insulating film. The edge of the top patch is connected to the edge of at least part of the opening of the film. The top patch is provided with at least two patch through holes. Projected along the thickness direction of the top cover, at least two of the patch through holes are provided in a one-to-one correspondence with at least two of the first electrode post, the second electrode post, and the explosion-proof valve.

16. The battery cell according to any one of claims 1 to 7, characterized in that, The top cover is provided with at least two of the first pole post, the second pole post, and the explosion-proof valve, and at least two of the first pole post, the second pole post, and the explosion-proof valve are located in the same membrane opening.

17. A battery device, characterized in that, The battery device includes a battery housing and a battery cell as described in any one of claims 1 to 16, wherein the battery cell is housed within the battery housing.

18. An electrical appliance, characterized in that, The electrical equipment includes the battery device as described in claim 17.

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