Battery cells and batteries

Abstract

The application provides a battery monomer and a battery, the battery monomer comprising: a shell with at least one open end; a cover plate body covering the open end; an insulating film comprising an insulating main body part and a folded edge part, the insulating main body part being arranged on the shell, and the folded edge part being fixed to the cover plate body; a top patch comprising a patch main body part and an auxiliary connecting part, the auxiliary connecting part being bent and connected to at least one side edge of the patch main body part; at least part of the patch main body part being connected to a surface of the folded edge part away from the cover plate body, and part of the auxiliary connecting part beyond the insulating film in the plane direction of the cover plate main body being bent and fixed to the insulating main body part. The battery monomer and the battery provided by the application can not only prevent the top patch from being warped, but also prevent the folded edge part from being warped, which helps to improve the appearance quality and the insulation performance of the battery monomer, and the top patch can also provide more reliable protection for the cover plate body.

Description

Technical Field

[0001] This application relates to the field of energy storage technology, and in particular to a battery cell and a battery. Background Technology

[0002] The battery cell includes a housing and a cover assembly that fits over the opening of the housing. To insulate the battery cell from the outside, an insulating film can be wrapped around the outside of the housing. After the insulating film is wrapped around the housing, the portion extending beyond the opening of the housing can be bent toward and connected to the cover assembly to form a folded edge.

[0003] However, the folded edge may form a multi-layered structure, which is prone to lifting. When the folded edge of the multi-layered structure lifts, it will exert a pushing force on the top patch covering it, causing the top patch to also lift. This not only affects the appearance of the battery, but also fails to provide insulation and protection. Utility Model Content

[0004] In view of this, the purpose of this application is to provide a battery cell and a battery to at least partially solve the problem of the insulation performance and appearance of the battery being affected by the lifting of the top patch.

[0005] To achieve the above objectives, a first aspect of this application provides a battery cell, comprising: a housing having at least one open end; a cover body covering the open end; an insulating film including an insulating main body and a folded edge, the insulating main body covering the housing and the folded edge fixed to the cover body; and a top patch including a patch main body and an auxiliary connecting portion, the auxiliary connecting portion being bent and connected to at least one edge of the patch main body; at least a portion of the patch main body being connected to the surface of the folded edge away from the cover body, and the portion of the auxiliary connecting portion extending beyond the insulating film along the plane of the cover body being bent and fixed to the insulating main body.

[0006] Optionally, the auxiliary connecting portion may be continuously or intermittently arranged around the edge of the patch body.

[0007] Optionally, the edges between two adjacent circumferential sidewalls of the housing are formed with a shell chamfer, the edge of the patch body is formed with a clearance structure corresponding to the shell chamfer, and the auxiliary connection is disconnected at least at the position corresponding to the clearance structure.

[0008] Optionally, the patch body includes a patch length edge and a patch width edge, and a patch chamfer is formed between the patch length edge and the patch width edge, the patch chamfer being configured as the avoidance structure; and / or, the folded edge is stacked along the thickness direction of the cover plate body in a portion of the cover plate body to form a multi-layer structure; the avoidance structure avoids the multi-layer structure.

[0009] Optionally, the avoidance structure is not connected to the auxiliary connection part.

[0010] Optionally, the auxiliary connection portion has an auxiliary side edge at the disconnected position, the auxiliary side edge intersecting with the edge of the patch body portion; the auxiliary connection portion also includes an auxiliary outer edge, the auxiliary outer edge being away from the edge of the patch body portion; the angle between the auxiliary outer edge and the intersecting auxiliary side edge is 80° to 120°.

[0011] Optionally, the auxiliary connection portion includes an auxiliary outer edge, the minimum dimension between the auxiliary outer edge and the edge of the adjacent patch body portion is the width L1 of the auxiliary connection portion, where L1 is 8mm to 12mm; and / or, along the height direction of the battery cell, the orthographic projection of the patch body portion onto the cover plate body is located within the cover plate body; the folded edge portion includes an outer edge close to the insulating body portion, and along the plane direction of the cover plate body, the minimum distance between the edge of the patch body portion and the outer edge of the adjacent folded edge portion is 0.2mm to 0.5mm; and / or, the top patch includes a substrate and an adhesive layer, the substrate being connected to the insulating film through the adhesive layer; the thickness of the substrate is 0.125mm to 0.25mm; and / or, the thickness of the adhesive layer is 0.05mm to 0.25mm.

[0012] Optionally, the top patch is integrally formed, and a bending crease is formed on the top patch at a preset position. The top patch is bent along the bending crease to form the patch body and the auxiliary connecting part; and / or, the material of the top patch is the same as the material of the insulating film.

[0013] Based on the same inventive concept, the second aspect of this application also provides a battery method, including a battery cell as described in the first aspect.

[0014] As can be seen from the above, the battery cell and battery provided in this application have an auxiliary connecting part of the top patch connected to the patch body. After the auxiliary connecting part is connected to the insulating body on the shell, the auxiliary connecting part can apply a pulling force toward the shell to the patch body, so that the patch body can achieve a tighter and more reliable connection with the folded edge. This can prevent the patch body and the folded edge from lifting, which helps to improve the appearance quality and insulation performance of the battery cell. The top patch can also provide more reliable protection for the cover plate body. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in this application or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a partial exploded view of a battery cell with the first structure according to an embodiment of this application;

[0017] Figure 2 This is a partial exploded view of a battery cell with the second structure according to an embodiment of this application;

[0018] Figure 3 This is a schematic diagram of the portion of the battery cell with the second structure according to an embodiment of this application where the insulating film extending beyond the cover plate body is not connected to the cover plate body.

[0019] Figure 4 This is a partial schematic diagram of the process of connecting the insulating film to the cover plate body of the battery cell in the second structure of this application embodiment;

[0020] Figure 5 This is a partial schematic diagram showing the completion of the connection of the insulating film between the battery cell and the cover plate body in the second structure of this application embodiment;

[0021] Figure 6 for Figure 5 Schematic diagram of the cross-section DD in the middle section;

[0022] Figure 7 This is a partial schematic diagram of the multilayer structure of a battery cell in an embodiment of this application when it is warped.

[0023] Figure 8 This is a schematic diagram of a battery cell with a third structure according to an embodiment of this application;

[0024] Figure 9 This is a partial exploded view of a battery cell with the third structure according to an embodiment of this application;

[0025] Figure 10 This is a partial schematic diagram of the battery cell with the third structure of this application after the patch body is connected and the auxiliary connection part is not connected;

[0026] Figure 11 This is a top view of the top patch of a battery cell with the fourth structure according to an embodiment of this application in an unfolded state;

[0027] Figure 12 This is a top view of the top patch of a battery cell with the third structure according to an embodiment of this application in an unfolded state;

[0028] Figure 13 This is a top view of the top patch of the battery cell of the fifth structure in this application embodiment in an unfolded state;

[0029] Figure 14 This is a partial schematic diagram of the fifth structure of the battery cell in this application, after the patch body is connected and the auxiliary connection part is not connected;

[0030] Figure 15 This is a partial schematic diagram of a battery cell with the fifth structure according to an embodiment of this application;

[0031] Figure 16 This is a schematic diagram of the end of a battery cell with the sixth structure according to an embodiment of this application;

[0032] Figure 17 This is a schematic diagram of the end of a battery cell with a third structure according to an embodiment of this application;

[0033] Figure 18 This is a partial cross-sectional view of the top patch of a battery cell according to an embodiment of this application.

[0034] Explanation of reference numerals in the attached figures:

[0035] 100. Shell; 110. Open end; 120. Shell chamfer;

[0036] 200. Insulating film; 210. Folded edge; 211. Multilayer structure; 2111. First sub-section; 2112. Second sub-section; 2113. Third sub-section; 212. Single-layer structure; 220. Insulating main body;

[0037] 300. Cover plate assembly; 310. Cover plate body; 320. Pole post; 330. Explosion-proof valve;

[0038] 400 Top patch; 410 Patch body; 411 Cutout area; 412 Patch length edge; 413 Patch width edge; 414 Clearance structure; 4141 Patch chamfer; 415 Bending mark; 420 Auxiliary connection part; 421 Auxiliary side edge; 422 Auxiliary outer edge; 430 Substrate; 440 Adhesive layer. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with specific embodiments and the accompanying drawings.

[0040] It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components described in these embodiments do not limit the scope of this application.

[0041] At the same time, it should be understood that, for ease of description, the dimensions of the various parts shown in the accompanying drawings are not drawn according to actual scale.

[0042] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the scope of this application and its application or use.

[0043] It should be noted that, unless otherwise defined, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," and similar terms used in the embodiments of this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are only used to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0044] Figure 1 A partial exploded view of a single battery cell of the first structure is shown. Figure 1 Taking the structure and orientation shown as an example, the battery cell may include a housing 100 and a cover assembly 300. The housing 100 has an opening 110 only at the top, that is, the housing 100 has one opening 110. The cover assembly 300 includes a cover body 310, and terminals 320 (including a positive terminal and a negative terminal) and an explosion-proof valve 330 connected to the cover body 310. The cover body 310 covers the opening 110.

[0045] For example, the cover body 310 and the housing 100 can be connected by welding.

[0046] Figure 2 A partial exploded view of a battery cell with the second structure is shown. Figure 2 Taking the structure and orientation shown as an example, the housing 100 may also have two open ends 110, with the two open ends 110 along the height direction of the battery cell (e.g., Figure 2The cover plate assembly 300 is arranged relative to the Z-direction (hereinafter referred to as the first direction). Correspondingly, there are two cover plate assemblies 300, each of which is connected to the opening end 110 in a one-to-one correspondence. Each cover plate assembly 300 includes a cover plate body 310, and each cover plate body 310 is connected to a pole post 320 (one cover plate body 310 is connected to a positive pole post, and the other cover plate body 310 is connected to a negative pole post) and an explosion-proof valve 330.

[0047] Regardless of whether it is the battery cell with the first structure or the battery cell with the second structure mentioned above, the outer surface of the casing 100 is covered with an insulating film 200, and a top patch 400 is also connected to the cover plate body 310. Figure 2 Taking the structure shown as an example, when the insulating film 200 is applied to the surface of the housing 100, a portion of the insulating film 200 extends beyond the cover plate body 310 in the first direction. This portion can be connected to the cover plate body 310 after bending and is constructed as a folded edge portion 210. A portion of the top patch 400 covers and is connected to the cover plate body 310, and another portion covers and is connected to the folded edge portion 210.

[0048] Specifically, Figure 3 A partial schematic diagram is shown when the insulating film 200 extending beyond the cover plate body 310 is not connected to the cover plate body 310. (See attached diagram.) Figure 3 At this time, the portion of the insulating film 200 extending beyond the cover plate body 310 is in a vertical state along the first direction, and this portion includes the length edge close to the cover plate body 310 (i.e., along the length edge). Figure 3 The portion on one side of the edge extending in the X direction (hereinafter referred to as the longitudinal portion), and the width edge near the cover body 310 (i.e., along the...). Figure 3 The portion on one side of the edge extending in the Y direction (hereinafter referred to as the width portion) is continuous or at least partially interrupted between the length portion and the width portion.

[0049] Due to differences in actual production processes or battery cell sizes, the method of applying the insulating film 200 to the battery cell may vary. Therefore, in some embodiments, the longitudinal portion and the transverse portion of the insulating film 200 are continuous or at least partially interrupted, while in other embodiments, the longitudinal portion and the transverse portion may be continuous or at least partially interrupted.

[0050] When the insulating film 200 has an adhesive layer on only one surface along its thickness direction, the portion of the insulating film 200 extending beyond the cover plate body 310 has an adhesive surface ( Figure 3 The center point pattern area faces the cover plate body 310, and the non-adhesive surface is away from the cover plate body 310.

[0051] Figure 4 A partial schematic diagram shows the process of attaching the insulating film 200 to the cover plate body 310. (See attached diagram.) Figure 4First, the longitudinal portion can be folded along the length edge of the cover plate body 310 and applied to the surface of the cover plate body 310 to form a single-layer structure 212 of the folded edge portion 210. At this time, the adhesive side of the longitudinal portion is adhered to the surface of the cover plate body 310, and the non-adhesive side ( Figure 4 The central cross pattern portion faces upwards. It should be noted that at this point, the longitudinal portion will have a sub-part extending beyond the width edge of the cover plate body 310 (i.e., Figure 4 In part C), the adhesive surface of this sub-part will connect with the adhesive surface of the width part to form an overlapping area of ​​the length part and the width part (hereinafter referred to as the overlapping area).

[0052] Figure 5 A partial schematic diagram shows the completed process of attaching the insulating film 200 to the cover plate body 310. (See attached diagram.) Figure 5 After connecting the longitudinal portion to the cover plate body 310, the lateral portion can be folded along the width edge of the cover plate body 310 and applied to the surface of the cover plate body 310. At this time, the overlapping area will be folded toward the adhesive-free surface of the longitudinal portion, forming a multi-layered structure 211 there, and a single-layered structure 212 formed on both sides of the multi-layered structure 211 along the edge of the cover plate body 310.

[0053] The above process is one way to cover the outer surface of the battery cell with an insulating film 200, wherein the folding order of the insulating film 200 is not particularly limited. That is, the wide portion of the insulating film 200 can be folded and applied to the surface of the cover body 310 first to form a single-layer structure 212 of the folded edge portion 210, and then the long portion can be folded along the long edge of the cover body 310 and applied to the surface of the cover body 310. At this time, the overlapping area will be folded toward the adhesive-free surface of the wide portion, and a similar multi-layer structure 211 and single-layer structure 212 will be formed there.

[0054] In addition, the portion of the insulating film 200 that connects the longitudinal and lateral portions, i.e., the portion of the insulating film 200 near one corner of the cover plate body 310, can be bonded together to form a two-layer structure. Then, the longitudinal and lateral portions of the insulating film 200 can be applied to the surface of the cover plate body 310. Finally, the two-layer structure can be folded toward the lateral or longitudinal portion to form the aforementioned multi-layer structure 211.

[0055] Figure 6 Showing Figure 5 A schematic diagram of the cross-section DD in the middle section. (See diagram below.) Figure 6 The multilayer structure 211 includes a first sub-part 2111 and a second sub-part 2112 formed by the longitudinal portion of the insulating film 200, and a third sub-part 2113 formed by the wide portion. The first sub-part 2111, the second sub-part 2112 and the third sub-part 2113 are stacked sequentially along the surface direction away from the cover plate body 310.

[0056] It needs to be clarified that yes, Figure 6 The diagonal line layer in the figure represents the adhesive layer disposed on the adhesive surface of the insulating film 200. Figure 6 The structures shown are only for clearly demonstrating the specific structures of the multi-layer structure 211 and the single-layer structure 212, and are not intended to define the relative positions between the single-layer structure 212 and the multi-layer structure 211.

[0057] like Figure 6 Since the first sub-part 2111 and the second sub-part 2112 are facing each other without adhesive, an effective connection cannot be formed between them. Over time, the insulating film 200 at the multilayer structure 211 will spring back, causing the first sub-part 2111 and the second sub-part 2112 to separate from each other, resulting in a warping problem at the multilayer structure 211.

[0058] like Figure 2 For the portion of the top patch 400 covering the folded edge 210, a portion of this area is located above the multilayer structure 211, for example, Figure 2 Region A in the text; a portion of the region is located above the single-layer structure 212, for example, Figure 2 Region B in the diagram. As mentioned above, multi-layered structures 211 are prone to warping.

[0059] Figure 7 A partial schematic diagram of the multi-layered structure 211 when it begins to warp is shown. For example... Figure 7 When the multilayer structure 211 warps, it pushes upwards against area A of the top patch 400, causing area A to warp along with the multilayer structure 211. Furthermore, when the material of the top patch 400 is relatively hard (for example, if the material of the top patch 400 is polypropylene (PP) or polycarbonate (PC), not only will area A warp along with the multilayer structure 211, but area B will also warp, rendering the top patch 400 ineffective in providing insulation and protection.

[0060] To avoid the above problems, this application provides a single battery cell.

[0061] Figure 8 A schematic diagram of a battery cell with a third structure is shown. Figure 9 A partial exploded schematic diagram of a battery cell with the third structure is shown.

[0062] like Figure 8 and Figure 9In some embodiments, the battery cell includes: a housing 100 having at least one open end 110; a cover body 310 covering the open end 110; an insulating film 200 including an insulating body portion 220 and a folded edge portion 210, the insulating body portion 220 covering the housing 100 and the folded edge portion 210 fixed to the cover body 310; and a top patch 400 including a patch body portion 410 and an auxiliary connecting portion 420, the auxiliary connecting portion 420 being bent and connected to at least one edge of the patch body portion 410; at least a portion of the patch body portion 410 being connected to the surface of the folded edge portion 210 away from the cover body 310, and the portion of the auxiliary connecting portion 420 extending beyond the insulating film 200 along the plane of the cover body 310 being bent and fixed to the insulating body portion 220.

[0063] For example, the top patch 400 can be formed by die-cutting the material into a preset shape.

[0064] For example, a portion of the patch body 410 may be attached to the surface of the cover body 310 (i.e., the surface of the cover body 310 that is away from the housing 100).

[0065] For example, the patch body 410 can be connected to the cover plate body 310 and the folded edge 210 respectively by means of heat pressing or adhesive bonding, and the auxiliary connection part 420 can be connected to the insulating body 220 by means of heat pressing or adhesive bonding. The connection methods used for the patch body 410 and the auxiliary connection part 420 can be the same or different.

[0066] For example, the patch body 410 and the auxiliary connection part 420 can be integrally molded, glued, or thermocoupled.

[0067] For example, the patch body 410 has a cutout area 411 corresponding to the pole post 320 and the explosion-proof valve 330 to prevent the top patch 400 from interfering with or obstructing the pole post 320 and the explosion-proof valve 330.

[0068] by Figure 9 Taking the structure and orientation shown as an example, after the insulating film 200 is connected, the top patch 400 can be installed. The patch body 410 of the top patch 400 covers the exposed part of the cover plate body 310 (i.e., the part without the insulating film 200) and the folded edge 210 from top to bottom. The patch body 410 can form a relatively reliable connection with the cover plate body 310, and at the same time, it will also exert a downward pressure on the folded edge 210.

[0069] Figure 10 A partial schematic diagram is shown when the main patch portion 410 is connected and the auxiliary connection portion 420 is not connected.

[0070] like Figure 10After the patch body 410 is connected, the unbent auxiliary connecting portion 420 can extend along the plane of the cover plate body 310. When bending the auxiliary connecting portion 420, it is driven close to the insulating body 220, and the auxiliary connecting portion 420 is made to fit and connect with the insulating body 220. It is understood that the insulating body 220 is a single layer on most of the surface of the housing 100, so a relatively reliable connection can be formed between the insulating body 220 and the housing 100. Correspondingly, after the auxiliary connecting portion 420 is connected to the insulating body 220, the insulating body 220 can reliably fix the auxiliary connecting portion 420. When the auxiliary connecting portion 420 is fixed, since the auxiliary connecting portion 420 is connected to the patch body 410, the auxiliary connecting portion 420 can provide a downward pulling force on the patch body 410 to prevent the patch body 410 from lifting.

[0071] In the battery cell provided in this embodiment, the auxiliary connecting portion 420 of the top patch 400 is connected to the patch body portion 410. After the auxiliary connecting portion 420 is connected to the insulating body portion 220 on the housing 100, the auxiliary connecting portion 420 can apply a pulling force toward the housing 100 to the patch body portion 410, so that the patch body portion 410 can achieve a tighter and more reliable connection with the folded edge portion 210. This can prevent the patch body portion 410 from lifting up and also prevent the folded edge portion 210 from lifting up, which helps to improve the appearance quality and insulation performance of the battery cell. The top patch 400 can also provide more reliable protection for the cover plate body 310.

[0072] Figure 11 A top view schematic diagram of the fourth structure's top patch 400 in its unfolded state is shown.

[0073] like Figure 11 In some embodiments, the auxiliary connection portion 420 is continuously disposed around the edge periphery of the patch body portion 410.

[0074] exist Figure 11 In this embodiment, the patch body 410 and the auxiliary connecting part 420 are bendable, and the auxiliary connecting part 420 is in an unfolded state. When installing the top patch 400 of this embodiment, the patch body 410 can be connected to the cover plate body 310 and the folded edge 210 first, and the auxiliary connecting part 420 can remain in an unfolded state at this time. When it is necessary to connect the auxiliary connecting part 420 to the insulating body 220, the auxiliary connecting part 420 is bent toward the housing 100 so that the auxiliary connecting part 420 is close to the insulating body 220 on the housing 100 until it contacts and connects with the insulating body 220.

[0075] When the auxiliary connection portion 420 is continuously arranged around the edge of the patch body portion 410, the connection area between the auxiliary connection portion 420 and the insulating body portion 220 is large, which can make the two form a more reliable connection relationship and help to further prevent the patch body portion 410 from lifting.

[0076] Figure 12 A top view schematic diagram of the top patch 400 of the third structure in its unfolded state is shown.

[0077] like Figure 8 and Figure 12 In some embodiments, the auxiliary connection portion 420 is discontinuously arranged around the edge of the patch body portion 410.

[0078] Figure 12 The top patch 400 shown also has a bendable structure between the patch body 410 and the auxiliary connecting part 420.

[0079] Combination Figure 8 As can be seen, when the auxiliary connection portion 420 is intermittently arranged around the edge of the patch body portion 410, it can avoid the corner position of the housing 100 when connecting with the insulating body portion 220. This prevents the auxiliary connection portion 420 from forming a multi-layer stacked structure or wrinkles at the corner position of the housing 100, which helps to improve the appearance quality of the battery cell. At the same time, it can also reduce the material cost of the top patch 400.

[0080] It should be noted that when the auxiliary connection part 420 is intermittently arranged around the edge of the patch body part 410, the disconnected part may be provided only at the corner of the housing 100, or it may be provided at the same time on the side wall of the housing 100 (for example, the side wall of the housing 100 with a larger area).

[0081] Figure 13 A top view schematic diagram of the fifth structure's top patch 400 in its unfolded state is shown.

[0082] like Figure 12 and Figure 13 In some embodiments, the patch body 410 includes two patch length edges 412 and two patch width edges 413, the two patch length edges 412 being along the thickness direction of the battery cell (e.g., ...). Figure 8 and Figure 12 The auxiliary connecting parts 420 are respectively disposed at intervals in the Y direction of the patch; the auxiliary connecting parts 420 are respectively disposed at the two patch width edges 413 and / or the two patch length edges 412.

[0083] For example, the structures of the two auxiliary connection portions 420 disposed on the patch width edge 413 can be the same or different. Similarly, the structures of the two auxiliary connection portions 420 disposed on the patch length edge 412 can be the same or different.

[0084] The auxiliary connection part 420 may be provided only on opposite sides of the patch body part 410. Figure 12 The structure shown is that the auxiliary connecting parts 420 are provided on the two patch width edges 413. After the two auxiliary connecting parts 420 are connected to the insulating body part 220, they can generate symmetrical tension on the patch body part 410, so that the patch body part 410 is subjected to more uniform force, which helps to ensure a reliable connection between the patch body part 410 and the folded edge part 210.

[0085] It should also be noted that, in combination Figure 2 It can be seen that on the folded edge portion 210 corresponding to the patch width edge 413, the gap between the two multi-layer structures 211 is smaller, and the pushing force on the top patch 400 is more concentrated. This makes the patch width edge 413 of the patch body portion 410 more prone to lifting. Therefore, setting the auxiliary connecting portion 420 on the two patch width edges 413 is more conducive to ensuring a reliable connection between the patch body portion 410 and the folded edge portion 210.

[0086] When the auxiliary connection part 420 is provided at the two patch length edges 412, the patch body part 410 can also be subjected to more uniform force.

[0087] Figure 13 The structure shown is that the auxiliary connection part 420 is provided on both the width edge 413 and the length edge 412 of the patch.

[0088] Figure 14 This diagram shows the structure of the top patch 400 of the fifth structure when the patch body 410 is connected and the auxiliary connection part 420 is not connected. Figure 15 A partial schematic diagram of the fifth type of battery cell is shown.

[0089] like Figure 14 After the patch body 410 is connected, the unbent auxiliary connecting part 420 extends along the plane of the cover plate body 310. For example... Figure 15 When bending the auxiliary connecting portion 420, the four auxiliary connecting portions 420 are driven to approach the insulating main body portion 220 respectively, and the four auxiliary connecting portions 420 are respectively attached and connected to the insulating main body portion 220. The four auxiliary connecting portions 420 are symmetrical in pairs, which not only provides greater tensile force to the patch main body portion 410, but also makes the force on the patch main body portion 410 more even, further ensuring a reliable connection between the patch main body portion 410 and the folded edge portion 210.

[0090] Meanwhile, since the auxiliary connection portion 420 provided at the patch length edge 412 and the auxiliary connection portion 420 provided at the patch width edge 413 are separated by the edge of the patch body portion 410, when the auxiliary connection portion 420 is connected to the insulating body portion 220, the corner position of the housing 100 can be avoided, and wrinkles can be prevented from appearing on the auxiliary connection portion 420.

[0091] like Figure 14 and Figure 15 In some embodiments, the edge between two adjacent circumferential sidewalls of the housing 100 is formed with a shell chamfer 120, the edge of the patch body portion 410 is formed with a clearance structure 414 corresponding to the shell chamfer 120, and the auxiliary connection portion 420 is disconnected at least at the position corresponding to the clearance structure 414.

[0092] For example, the shell chamfer 120 can be a rounded corner or a beveled corner.

[0093] For example, the cover body 310 is provided with a structure that matches the shell chamfer 120 so that the cover body 310 can cover the shell 100.

[0094] For example, the avoidance structure 414 may include a chamfer or a cutout structure of a certain shape provided on the edge of the patch body portion 410.

[0095] During the molding of the housing 100, a chamfer 120 is formed at the edge of the housing 100 to prevent stress concentration. If too many top patches 400 are connected at the chamfer 120, wrinkles may easily appear on the top patches 400 at the chamfer 120 after the auxiliary connection part 420 is bent and fixed to the insulating body part 220, which will have an adverse effect on the insulation and appearance quality of the battery cell.

[0096] To address the aforementioned issues, this embodiment provides a clearance structure 414 corresponding to the shell chamfer 120 in the patch body 410. The clearance structure 414 ensures that the patch body 410 does not extend beyond the shell chamfer 120 along the plane of the cover plate body 310. Simultaneously, the auxiliary connection portion 420 is disconnected at the clearance structure 414, preventing it from covering the shell chamfer 120, or at least ensuring that the auxiliary connection portion 420 is flatly fixed at the shell chamfer 120. This helps prevent wrinkles from appearing on the top patch 400 after fixing, resulting in a smoother overall surface for the top patch 400, which improves the insulation and appearance quality of the battery cell.

[0097] like Figure 13 In some embodiments, a patch chamfer 4141 is formed between the patch length edge 412 and the patch width edge 413, and the patch chamfer 4141 is configured as a clearance structure 414.

[0098] For example, the patch chamfer 4141 can be a rounded corner or a beveled corner.

[0099] For example, the shape of the patch chamfer 4141 may be the same as or different from the shape of the shell chamfer 120. For instance, when the shell chamfer 120 is a rounded corner, the patch chamfer 4141 may also be a rounded corner, or the patch chamfer 4141 may be a beveled corner.

[0100] Since one of the functions of the avoidance structure 414 is to avoid the shell chamfer 120, constructing the chamfered patch 4141 with the chamfered structure as the avoidance structure 414 makes it easier for the avoidance structure 414 to correspond with the structure of the shell chamfer 120, thus achieving better avoidance. At the same time, the chamfered structure is easy to form when die-cutting the top patch 400. Even if the top patch 400 uses a film material with a large thickness or high hardness, it is easy to form a patch chamfer 4141 with dimensions that meet the design requirements.

[0101] Figure 16 A schematic diagram of the end of a battery cell with the sixth structure is shown.

[0102] like Figure 9 and Figure 16 In some embodiments, the folded edge 210 is stacked along the thickness direction of the cover plate body 310 in a portion of the cover plate body 310 to form a multi-layer structure 211; the avoidance structure 414 avoids the multi-layer structure 211.

[0103] Based on the foregoing, when the top patch 400 covers the multilayer structure 211, the multilayer structure 211 may push the top patch 400 upwards, causing the top patch 400 to lift up.

[0104] To avoid the aforementioned problems, a clearance structure 414 can be provided on the top patch 400, and the location of the clearance structure 414 corresponds to the location of the multi-layer structure 211. In this case, the clearance structure 414 ensures that the top patch 400 no longer covers the multi-layer structure 211. Even if the multi-layer structure 211 warps, it will not exert force on the top patch 400, thus ensuring that the top patch 400 maintains a tight and reliable connection with the cover plate body 310 and the portion of the folded edge 210 other than the multi-layer structure 211, effectively preventing the top patch 400 from warping.

[0105] like Figure 13 In some embodiments, the avoidance structure 414 is not connected to the auxiliary connection part 420.

[0106] For example, along the edge of the patch body portion 410, the auxiliary connection portion 420 extends to the starting position of the avoidance structure 414 and stops, and can continue to extend at the ending position of the avoidance structure 414.

[0107] If the avoidance structure 414 is not connected to the auxiliary connection part 420, it can at least ensure that the root of the auxiliary connection part 420 (i.e. the part of the auxiliary connection part 420 that is connected to the patch body part 410) will not cover the shell chamfer 120, which helps to reduce the risk of wrinkles appearing on the top patch 400 after it is fixed, and can make the top patch 400 relatively flat overall, which helps to improve the insulation and appearance quality of the battery cell.

[0108] like Figure 13 In some embodiments, the auxiliary connection portion 420 has an auxiliary side edge 421 formed at the disconnected position, and the auxiliary side edge 421 intersects with the edge of the patch body portion 410; the auxiliary connection portion 420 also includes an auxiliary outer edge 422, which is away from the edge of the patch body portion 410; the included angle α between the auxiliary outer edge 422 and the intersecting auxiliary side edge 421 is 80° to 120°.

[0109] For example, the included angle α can be 80°, 85°, 90°, 95°, 100°, 105°, 110°, 115° or 120°.

[0110] For example, the included angle α of different auxiliary connecting parts 420 connected to the same patch body part 410 can be the same or different.

[0111] For example, the included angles α of the two auxiliary connecting parts 420 can be the same or different.

[0112] If the angle α is too small, on the one hand, it may result in an insufficient connection size between the auxiliary connection portion 420 and the patch body portion 410, leading to low connection reliability. On the other hand, after the auxiliary connection portion 420 is bent, the end of the auxiliary connection portion 420 (i.e., the part of the auxiliary connection portion 420 away from the patch body portion 410) may still excessively cover the shell chamfer 120. The auxiliary connection portion 420 located at the patch width edge 413 and the auxiliary connection portion 420 located at the patch length edge 412 may form a stacked structure at the shell chamfer 120, which is prone to wrinkles, affecting the appearance of the battery cell and also leading to higher material costs for the top patch 400. If the angle α is too large, it will result in a smaller area of ​​the auxiliary connection portion 420. Correspondingly, the connection area between the auxiliary connection portion 420 and the insulating body portion 220 will also be smaller. The pulling force that the auxiliary connection portion 420 can generate on the patch body portion 410 will be smaller, and the patch body portion 410 will still be at risk of warping.

[0113] To avoid the above problems, this embodiment designs the angle of α to be between 80° and 120°. This not only ensures a reliable connection between the auxiliary connection part 420 and the patch body part 410, guaranteeing that the auxiliary connection part 420 can be flatly connected to the insulating body part 220, which helps improve the appearance quality of the battery cell, but also allows for a larger connection area between the auxiliary connection part 420 and the insulating body part 220, ensuring that the auxiliary connection part 420 can generate a large pulling force on the patch body part 410, preventing the patch body part 410 from lifting.

[0114] like Figure 13 In some embodiments, the minimum dimension between the auxiliary outer edge 422 and the edge of the adjacent patch body portion 410 is the width L1 of the auxiliary connection portion 420, where L1 is 8 mm to 12 mm.

[0115] For example, when the auxiliary connection portion 420 is respectively disposed on the patch width edge 413 and the patch length edge 412, the width of the auxiliary connection portion 420 disposed on the patch width edge 413 may be the same as or different from the width of the auxiliary connection portion 420 disposed on the patch length edge 412.

[0116] For example, the widths of different regions of the same auxiliary connection part 420 may be the same or different.

[0117] For example, L1 can be 8mm, 9mm, 10mm, 11mm or 12mm.

[0118] If L1 is too large, there is a high risk of wrinkles appearing on the insulating main body 220 when connecting the auxiliary connection part 420, making it more difficult to assemble the battery cell. If L1 is too small, the area of ​​the auxiliary connection part 420 will be too small, and there is still a risk of the patch main body 410 lifting up.

[0119] To avoid the above problems, in this embodiment, L1 is designed to be 8mm to 12mm to ensure that the auxiliary connection part 420 can generate a large pulling force on the patch body part 410, prevent the patch body part 410 from lifting, and at the same time, reduce the risk of wrinkles in the insulating body part 220, which helps to reduce the assembly difficulty of the battery cell and improve the assembly efficiency.

[0120] like Figure 8 In some embodiments, the top patch 400 is integrally formed, and the top patch 400 has a bending line 415 formed at a preset position. The top patch 400 is bent along the bending line 415 to form the patch body portion 410 and the auxiliary connecting portion 420.

[0121] For example, the bend 415 can be a continuous or discontinuous etch, such as a toothed line.

[0122] When the top patch 400 includes a membrane material with high rigidity, after the membrane material is die-cut according to a preset shape, a bending crease 415 can be formed at a preset position to facilitate bending of the auxiliary connecting portion 420 when connecting the top patch 400. At the same time, it also helps to reduce the springback force generated by the auxiliary connecting portion 420 after bending, which helps to form a reliable connection between the auxiliary connecting portion 420 and the insulating main body 220.

[0123] In some embodiments, the material of the top patch 400 is the same as the material of the insulating film 200.

[0124] When the material of the top patch 400 is the same as that of the insulating film 200, the hardness of the top patch 400 is relatively small, and it is easier to bend the auxiliary connection part 420. In this case, the bending line 415 does not need to be set on the top patch 400, thereby simplifying the molding process of the top patch 400.

[0125] Figure 17 A schematic diagram of the end of a battery cell with the third structure is shown.

[0126] like Figure 17 In some embodiments, along the first direction, the orthographic projection of the patch body portion 410 onto the cover plate body 310 is located within the cover plate body 310; the folded edge portion 210 includes an outer edge close to the insulating body portion 220, and along the planar direction of the cover plate body 310, the minimum distance L2 between the edge of the patch body portion 410 and the outer edge of the adjacent folded edge portion 210 is 0.2 mm to 0.5 mm.

[0127] For example, L2 is 0.2mm, 0.3mm, 0.4mm or 0.5mm.

[0128] If L2 is too large, the area of ​​the patch body 410 will be too small, failing to provide adequate protection and negatively impacting the insulation performance of the battery cells. In actual production, dimensional tolerances are unavoidable for the patch body 410, and positional tolerances between the patch body 410 and the cover plate body 310 are also unavoidable during installation. If L2 is designed to be too small, the edges of the patch body 410 may extend beyond the outer edge of the folded edge 210 due to the influence of dimensional and positional tolerances. This would prevent the root of the auxiliary connection 420 from tightly fitting with the insulating body 220, resulting in poor connection reliability between the two.

[0129] Therefore, in order to avoid the above problems, this embodiment designs L2 to be 0.2mm to 0.5mm, which can ensure that the patch body 410 can play a good protective role and improve the insulation performance of the battery cell, and also ensure that the root of the auxiliary connection part 420 can be tightly fitted with the insulating body 220, which helps to improve the connection reliability between the two.

[0130] Figure 18 A partial cross-sectional view of the top patch 400 is shown.

[0131] like Figure 18 In some embodiments, the top patch 400 includes a substrate 430 and an adhesive layer 440, wherein the substrate 430 is connected to the insulating film 200 through the adhesive layer 440; the thickness H1 of the substrate 430 is 0.125 mm to 0.25 mm; and / or, the thickness H2 of the adhesive layer 440 is 0.05 mm to 0.25 mm.

[0132] For example, the substrate 430 may be polypropylene (PP), polycarbonate (PC), or polyethylene terephthalate (PET).

[0133] For example, the adhesive layer 440 may be a pressure-sensitive adhesive or a hot melt adhesive.

[0134] For example, the adhesive layer 440 may be formed over the entire surface of the substrate 430, or it may be formed over a portion of the surface of the substrate 430.

[0135] For example, H1 can be 0.125mm, 0.13mm, 0.135mm, 0.14mm, 0.145mm, 0.15mm, 0.16mm, 0.17mm, 0.18mm, 0.19mm, 0.2mm, 0.21mm, 0.22mm, 0.23mm, 0.24mm or 0.25mm.

[0136] For example, H2 can be 0.05mm, 0.1mm, 0.15mm, 0.2mm, or 0.25mm.

[0137] If H1 is too large, it will be difficult to bend the top patch 400, making it inconvenient for assembling the battery cells. If H1 is too small, the top patch 400 will be easily scratched during assembly and use, failing to provide adequate protection and also adversely affecting the insulation performance of the battery cells.

[0138] To avoid the above problems, in this embodiment, H1 is designed to be 0.125mm to 0.25mm. This ensures that the top patch 400 can provide good protection and improve the insulation performance of the battery cell. It also makes the top patch 400 easy to bend, ensuring that the auxiliary connection part 420 can form a reliable connection with the insulating body part 220. At the same time, it reduces the assembly difficulty of the battery cell.

[0139] If H2 is too large, the overall thickness of the top patch 400 will be too large, which will adversely affect the energy density of the battery cell. If H2 is too small, the adhesive force will be too small, and a reliable connection between the substrate 430 and the insulating film 200 cannot be guaranteed.

[0140] To avoid the above problems, this embodiment designs H2 to be 0.05mm to 0.25mm, which can ensure that the substrate 430 and the insulating film 200 can form a reliable connection, and also helps to improve the energy density of the battery cell.

[0141] Based on the same inventive concept and in conjunction with the description of the battery cells in the above embodiments, this embodiment provides a battery that has the corresponding technical effects of the battery cells in the above embodiments, which will not be repeated here.

[0142] A battery comprising a battery cell as described in the various embodiments above.

[0143] It should be noted that some embodiments of this application have been described above. Other embodiments are within the scope of the appended claims.

[0144] The various embodiments in this application are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0145] The description in this application is given for illustrative purposes and is not intended to be exhaustive or to limit the application to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described to better illustrate the principles and practical application of this application and to enable those skilled in the art to understand this application and design various embodiments with various modifications suitable for a particular purpose.

[0146] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of this application is limited to these examples; under the concept of this application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of the embodiments of this application as described above, which are not provided in detail for the sake of brevity.

[0147] Although this application has been described in conjunction with specific embodiments thereof, many substitutions, modifications and variations of these embodiments will be apparent to those skilled in the art from the foregoing description.

[0148] The embodiments of this application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of this application. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the embodiments of this application should be included within the protection scope of this application.

Claims

1. A battery cell, characterized in that, include: The housing has at least one open end; The cover plate body covers the opening end; An insulating film includes an insulating main body and a folded edge, wherein the insulating main body is covered on the housing and the folded edge is fixed to the cover plate body; The top patch includes a patch body and an auxiliary connecting part, wherein the auxiliary connecting part is bent and connected to at least one edge of the patch body; at least a portion of the patch body is connected to the surface of the folded edge away from the cover plate body, and the portion of the auxiliary connecting part extending beyond the insulating film along the plane direction of the cover plate body is bent and fixed to the insulating body.

2. The battery cell according to claim 1, characterized in that, The auxiliary connection portion is continuously or intermittently arranged around the edge of the patch body.

3. The battery cell according to claim 2, characterized in that, The patch body includes two patch length edges and two patch width edges, with the two patch length edges spaced apart along the thickness direction of the battery cell; The auxiliary connection portions are respectively located at the two patch width edges and / or the two patch length edges.

4. The battery cell according to claim 1, characterized in that, The edge between two adjacent circumferential sidewalls of the housing is formed with a shell chamfer, the edge of the patch body is formed with a clearance structure corresponding to the shell chamfer, and the auxiliary connection is disconnected at least at the position corresponding to the clearance structure.

5. The battery cell according to claim 4, characterized in that, The patch body includes a patch length edge and a patch width edge, and a patch chamfer is formed between the patch length edge and the patch width edge, the patch chamfer constituting the avoidance structure; and / or The folded edge is stacked along the thickness direction of the cover plate body in a certain area to form a multi-layer structure; the avoidance structure avoids the multi-layer structure.

6. The battery cell according to claim 4, characterized in that, The avoidance structure is not connected to the auxiliary connection part.

7. The battery cell according to claim 6, characterized in that, The auxiliary connection portion has an auxiliary side edge at the disconnected position, and the auxiliary side edge intersects with the edge of the patch body portion; the auxiliary connection portion also includes an auxiliary outer edge, which is away from the edge of the patch body portion; The angle between the auxiliary outer edge and the intersecting auxiliary side edge is 80° to 120°.

8. The battery cell according to claim 1, characterized in that, The auxiliary connection portion includes an auxiliary outer edge, the minimum dimension between the auxiliary outer edge and the edge of the adjacent patch body portion being the width L1 of the auxiliary connection portion, where L1 is 8mm to 12mm; and / or, Along the height direction of the battery cell, the patch body portion is projected onto the cover plate body in the orthographic projection of the cover plate body; the folded edge portion includes an outer edge close to the insulating body portion, and along the plane direction of the cover plate body, the minimum distance between the edge of the patch body portion and the outer edge of the adjacent folded edge portion is 0.2 mm to 0.5 mm; and / or, The top patch includes a substrate and an adhesive layer, wherein the substrate is connected to the insulating film via the adhesive layer; the thickness of the substrate is 0.125 mm to 0.25 mm; and / or, the thickness of the adhesive layer is 0.05 mm to 0.25 mm.

9. The battery cell according to any one of claims 1 to 8, characterized in that, The top patch is integrally formed, and a bending crease is formed on the top patch at a preset position. The top patch is bent along the bending crease to form the patch body and the auxiliary connecting part; and / or The material of the top patch is the same as the material of the insulating film.

10. A battery, characterized in that, Includes the battery cell as described in any one of claims 1 to 9.

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