Battery and electrical device

Abstract

Provided are a battery (1000) and an electrical device. The battery (1000) comprises a package (500), a battery cell and tab assemblies; the battery cell is arranged in the package (500); one part of each tab assembly is located in the package (500) and is connected to the battery cell, and one part of the tab assembly extends out of the package (500); each tab assembly comprises a tab body (100) and a sealing layer (200) located between the package (500) and the tab body (100), the sealing layer (200) wraps part of the peripheral surface of the tab body (100), and in a first direction, a first surface and a second surface, which are arranged opposite each other, of the sealing layer (200) each comprise an exposed region (220) extending out of the package (500) and a sealing region (210) connected to the package (500); and each exposed region (220) comprises a first region (221) arranged opposite the tab body (100), at least one first region (221) comprises a first sub-region (2211) and a second sub-region (2212), and the thickness of the first sub-region (2211) is less than the thickness of the second sub-region (2212). The tab assembly is bent along the first sub-region (2211), such that the bending stress of the tab assembly can be reduced, the overall height of the battery (1000) can be reduced, and the energy density of the battery (1000) is increased.

Description

Batteries and electrical devices

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on December 15, 2023, with application number 202311725182.4 and application name “Battery and Electrical Device”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of energy storage technology, and in particular to a battery and an electrical device. Background Art

[0003] Batteries, devices that convert chemical energy into electrical energy, are widely used in new energy vehicles, energy storage power stations, and other fields. Batteries typically consist of a battery case and a cell housed within it. To connect the cell's electrode assembly to external components, tabs are typically required to achieve these connections.

[0004] In related art, a tab structure typically consists of two tabs, one connected to one electrode plate of the electrode assembly, and the other connected to the other electrode plate of the electrode assembly. The tab structure can be the link between the battery cell's power output or storage. The tab structure consists of a tab body and a sealing layer. The sealing layer prevents short circuits between the tab body and the aluminum-plastic film during packaging. During packaging, the aluminum-plastic film is heat-sealed together to prevent leakage.

[0005] After the battery cell is manufactured, it needs to be connected to the protection board to provide protection for the battery cell during charging and discharging. However, the above-mentioned tab structure has the disadvantage of being difficult to bend.

[0006] Summary of the Invention

[0007] The embodiments of the present application provide a battery and an electrical device, which can reduce the difficulty of bending the tab assembly in the battery.

[0008] A first aspect of an embodiment of the present application provides a battery, comprising a package, a battery cell, and a tab assembly, wherein the battery cell is disposed within the package; a portion of the tab assembly is located within the package and connected to the battery cell, and a portion of the tab assembly extends outside the package;

[0009] The tab assembly includes a tab body and a sealing layer located between the packaging body and the tab body, wherein the sealing layer wraps a portion of the outer circumference of the tab body, and along a first direction, a first surface and a second surface of the sealing layer, which are oppositely disposed, respectively include an exposed area extending from the packaging body and a sealing area connected to the packaging body;

[0010] The exposed areas each include a first region disposed opposite to the tab body, and at least one of the first regions includes a first sub-region and a second sub-region connected to each other, wherein the thickness of the first sub-region is smaller than that of the second sub-region.

[0011] In an optional embodiment, in the second direction, the second sub-region is located between the first sub-region and the sealing area.

[0012] In an optional embodiment, a thickness difference between the first sub-region and the second sub-region ranges from 10 μm to 120 μm.

[0013] In an optional embodiment, the first area of ​​the first surface and the first area of ​​the second surface both include a first sub-area and a second sub-area.

[0014] In an optional embodiment, a projection area of ​​one of the first sub-regions on the tab body at least partially overlaps with a projection area of ​​another first sub-region on the tab body.

[0015] In an optional embodiment, a misalignment dimension between a projection area of ​​one of the first sub-regions on the tab body and a projection area of ​​another first sub-region on the tab body is less than or equal to 0.5 mm.

[0016] In an optional embodiment, in the second direction, the ratio of the length L2 of the first sub-region to the length L1 of the second sub-region is in the range of 1:1-1:10.

[0017] In an optional embodiment, the length L2 of the first sub-region is between 0.1 mm and 1.0 mm; and / or the length L1 of the second sub-region is between 0.1 mm and 1.5 mm.

[0018] In an optional embodiment, the exposed area further includes a second region; in the third direction, the second region is located at least on one side of the first region.

[0019] In an optional embodiment, in the second direction, the distance between the edge of the second region away from the edge of the sealing area and the edge of the sealing area is a first distance; the distance between the edge of the first sub-region away from the edge of the second sub-region and the edge of the sealing area is a second distance; the first distance is smaller than the second distance.

[0020] In an optional implementation, the first distance has a value range of 0.1 mm to 2.0 mm; the second distance has a value range of 0.1 mm to 3.0 mm.

[0021] In an optional embodiment, the thickness t3 of the second region is greater than the thickness t2 of the second sub-region.

[0022] In an optional embodiment, the thickness of the first sub-region is t1; wherein the value range of t1 is 0.05 μm to 20 μm; and / or the value range of t2 is 30 μm to 150 μm; and / or the value range of t3 is 60 μm to 300 μm.

[0023] In an optional embodiment, an edge of the second sub-region facing away from the sealing area is higher than an edge of the second region facing away from the sealing area.

[0024] In an optional embodiment, the edge of the second region away from the sealing area is connected to the edge of the second sub-region away from the sealing area through an arc surface.

[0025] In an optional embodiment, the second region includes a third sub-region and a fourth sub-region, the third sub-region is connected to the sealing region, and the fourth sub-region is arranged on a side of the third sub-region away from the sealing region;

[0026] The thickness of the fourth sub-region is greater than the thickness of the third sub-region.

[0027] In an optional embodiment, along the direction from the second area to the first area, the distance between the edge of the second area facing away from the sealing area and the sealing area gradually increases.

[0028] In an optional embodiment, the fourth sub-region has a curved surface on a side facing away from the sealing area.

[0029] In an optional embodiment, the sealing layer further includes an inner sealing area located within the package body, and a thickness t7 of the inner sealing area is greater than a thickness t1 of the first sub-area.

[0030] In an optional embodiment, a protective plate is further included; the end of the tab assembly facing away from the battery cell extends outside the packaging body, and the end of the tab assembly facing away from the electrode of the battery cell is bent around the first sub-region to form a bent portion; the protective plate is connected to the bent portion.

[0031] In an optional embodiment, the first sub-region includes a first portion and a second portion connected to the first portion, and the second portion is located at the bending portion.

[0032] A second aspect of the embodiments of the present application provides an electrical device, comprising the battery described in the first aspect.

[0033] In the battery and electrical device provided in the embodiments of the present application, the first region of the sealing layer is designed so that the first region includes a first subregion and a second subregion. When the tab assembly is subsequently bent, the bending can be performed along the first subregion. This reduces the bending stress of the tab assembly, facilitates bending of the tab assembly, and improves the yield of the tab assembly. Furthermore, when bending the tab assembly, the tab assembly and protective plate can be bent downward as much as possible, thereby reducing the overall height of the battery and thereby improving the battery's energy density. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0035] FIG1 is a structural schematic diagram of a battery provided in an embodiment of the present application;

[0036] FIG2 is a front view of a tab assembly according to an embodiment of the present application;

[0037] FIG3 is a first rear view of a tab assembly provided in an embodiment of the present application;

[0038] FIG4 is a cross-sectional view taken along the AA direction in FIG2 ;

[0039] FIG5 is a second cross-sectional view along the AA direction in FIG2 ;

[0040] Figure 6 is a cross-sectional view taken along the line BB in Figure 2;

[0041] FIG7 is a second front view of the tab assembly provided in an embodiment of the present application;

[0042] FIG8 is a second rear view of the tab assembly provided in an embodiment of the present application;

[0043] FIG9 is a cross-sectional view taken along the CC direction in FIG8 ;

[0044] FIG10 is a third front view of the tab assembly provided in an embodiment of the present application;

[0045] FIG11 is a second structural diagram of a battery provided in an embodiment of the present application;

[0046] FIG12 is an enlarged schematic diagram of the D region in FIG11 .

[0047] Description of reference numerals:

[0048] 1000: battery;

[0049] 100: Tab body; 200: Sealing layer; 210: Sealing area; 220: Exposed area; 230: Inner sealing area; 221: First area; 2211: First sub-area; 2212: Second sub-area; 2212a: First edge; 2212b: Second edge; 222: Second area; 2221: Third edge; 2222: Fourth edge; 2223: Third sub-area; 2224: Fourth sub-area; 240: Notch area; 250: Arc surface; 260: Bend; 261: First bend; 262: Second bend

[0050] 300: top edge sealing; 400: side edge sealing; 500: packaging body; 600: protection plate.

[0051] The above drawings illustrate specific embodiments of the present application, which will be described in more detail below. These drawings and the textual description are not intended to limit the scope of the present application in any way, but rather to illustrate the concepts of the present application to those skilled in the art by reference to specific embodiments. DETAILED DESCRIPTION

[0052] As described in the background, the tab assembly in the related art is difficult to bend. The inventors discovered that this problem arises because the thickness of the exposed area of ​​the sealing layer and the first area opposite the tab body are uniform throughout. When the tab assembly is bent, the sealing layer experiences significant bending stress, which can easily cause the tab assembly to break, reducing the tab assembly's yield. Furthermore, the tab assembly is likely to bend along the end of the sealing layer facing away from the sealing area, increasing the overall height of the tab assembly and protective plate, thereby reducing the battery's energy density.

[0053] In response to the above technical problems, an embodiment of the present application provides a battery, in which the first area of ​​the sealing layer is designed so that the first area includes a first sub-area and a second sub-area. When the tab assembly is subsequently bent, it can be bent along the first sub-area. On the one hand, the bending stress of the tab assembly can be reduced, the bending of the tab assembly is facilitated, and the yield of the tab assembly is improved. On the other hand, when the tab assembly is bent, the tab assembly and the protective plate can be bent downward as much as possible, thereby reducing the overall height of the battery and further improving the energy density of the battery.

[0054] In order to make the above-mentioned purposes, features and advantages of the embodiments of the present application more obvious and easy to understand, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments.

[0055] An embodiment of the present application provides an electrical device, wherein the electrical device includes a battery that can provide electrical energy to the electrical device. The electrical device in the embodiment of the present application can be a vehicle, for example, a fuel vehicle, a gas vehicle, or a new energy vehicle, wherein the new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle.

[0056] In addition, the device may also be other energy storage devices, such as mobile phones, portable devices, laptop computers, electric toys, electric tools, ships and spacecraft, etc., wherein the spacecraft may include airplanes, rockets, space shuttles or spacecraft.

[0057] Referring to Figures 11 and 12 , battery 1000 includes a package 500, a battery cell 700, and a tab assembly. The battery cell 700 is disposed within the package 500, wherein the battery cell 700 may be a wound core or a stacked core. The package 500 is made of an aluminum-plastic film. The tab assembly is connected to the battery cell 700, i.e., the tab assembly is connected to one electrode of the battery cell 700. During packaging, the two side edges of the battery cell are heat-sealed to each other using the aluminum-plastic film, and the top edge of the battery cell is heat-sealed to the sealing layer to form the package 500.

[0058] A portion of the tab assembly is located within the package 500 and is connected to the battery cell 700, and a portion of the tab assembly extends outside the package 500. In other words, the end of the tab assembly facing away from the battery cell 700 extends outside the package 500. It should be noted that the tab assembly in this embodiment can be divided into two parts, one of which is located within the package 500 and the other extends outside the package 500.

[0059] Please refer to Figures 1 to 12. The tab assembly includes a tab body 100. The tab body 100 is used to connect the battery's pole piece, and one end of the tab body 100 facing away from the pole piece extends out of the battery. The tab body 100 can be a link for outputting or storing electrical energy in the battery cell. It should be noted that the battery's pole piece usually protects the positive and negative pole pieces. Therefore, each battery has two tab assemblies, one of which is connected to the battery's positive pole piece, and the other is connected to the battery's negative pole piece. The material of the tab body 100 can include one of aluminum, nickel, and copper-plated nickel.

[0060] The tab assembly also includes a sealing layer 200, located between the package body 500 and the tab body 100. The sealing layer 200 serves as the insulating portion of the tab assembly. When the tab assembly is packaged with the aluminum-plastic film, it prevents short circuits between the tab body 100 and the film. Furthermore, the sealing layer 200 is heated during packaging to form a heat-melt seal with the film to prevent battery leakage. Therefore, the sealing performance of the sealing layer 200 is crucial to the overall battery performance.

[0061] The sealing layer 200 is wrapped around a portion of the outer circumference of the tab body 100. For its structure, please refer to Figures 2 and 3. In this example, the length of the sealing layer 200 is shorter than the length of the tab body 100. Furthermore, the width of the sealing layer 200 is greater than the width of the tab body 100. This improves the insulation performance of the sealing layer 200.

[0062] It should be noted that Figure 2 is a front view of the tab assembly; Figure 3 is a rear view of the tab assembly. The first direction is the thickness direction of the tab body 100, i.e., the Z direction in Figure 2 ; the second direction is the length direction of the tab body 100, or the extension direction of the tab body 100, i.e., the length direction Y of the tab body 100 ; and the third direction is the width direction of the tab body 100, i.e., the X direction in Figure 2 . Furthermore, it should be understood that the fill lines in Figures 2 and 3 are used to more clearly delineate different areas of the tab assembly.

[0063] Referring to FIG4 , along a first direction, the sealing layer 200 includes a first surface and a second surface disposed opposite each other, wherein the first surface and the second surface represent the front adhesive area and the back adhesive area of ​​the sealing layer 200 , respectively. Further referring to FIG2 and FIG3 , in a second direction, the first surface and the second surface each include an exposed area 220 extending from the package body 500 and a sealing area 210 connected to the package body 500 , wherein the sealing area 210 and the exposed area 220 are connected to each other. The sealing area 210 is used for hot pressing with the aluminum-plastic film of the battery to seal the battery. It should be understood, referring to FIG1 , that the edge of the aluminum-plastic film of the battery 1000 opposite the sealing area 210 is referred to as the top seal 300, and the remaining edges are referred to as the side seals 400.

[0064] Please refer to Figures 1 and 2 , the exposed area 220 is located outside the battery 1000 , and each exposed area 220 includes a first area 221 . The first area 221 is arranged opposite to the tab body 100 , that is, the first area 221 is located directly above the tab body 100 .

[0065] At least one first region 221 includes a first sub-region 2211 and a second sub-region 2212, and the first sub-region 2211 and the second sub-region 2212 are interconnected. In this example, the first sub-region 2211 and the second sub-region 2212 are interconnected, which can be understood as the first sub-region 2211 and the second sub-region 2212 being arranged sequentially along the second direction Y. As an example, the first sub-region 2211 is located between the second sub-region 2212 and the sealing area 210. As another example, referring to FIG. 2 , in the second direction, the second sub-region 2212 is located between the first sub-region 2211 and the sealing area 210. When preparing the sealing layer 200, an initial adhesive layer of a predetermined thickness can be applied, and then a cutting process is used to remove the thickness of the initial adhesive layer located directly above the tab body 100 and near the outer end of the tab body 100 to form the first sub-region 2211. In this embodiment, the first sub-region 2211 is disposed on a side of the second sub-region 2212 away from the sealing region 210 , which can reduce the difficulty of preparing the first sub-region 2211 and improve the yield of the tab assembly.

[0066] It should be noted that in this embodiment, at least one first region 221 includes a first sub-region 2211 and a second sub-region 2212 that are interconnected, and two different implementations are possible. As an example, referring to Figures 2, 3, and 5, one first region 221 includes a first sub-region 2211 and a second sub-region 2212, while the other first region 221 is entirely a second sub-region. When one first region 221 includes a first sub-region 2211, the projection of the first sub-region 2211 on the tab body 100 partially overlaps with the projection of the other first region 221 on the tab body 100. That is, the area of ​​the first sub-region 2211 is smaller than the area of ​​the first region 221. This can reduce the bending stress of the tab assembly and avoid excessive reduction in the thickness of the first region 221.

[0067] As another example, both first regions 221 include a first sub-region 2211 and a second sub-region 2212. In other words, the first regions 221 on the first and second surfaces each include a first sub-region 2211 and a second sub-region 2212. The structures of these structures can be referred to in Figures 2 and 4. This arrangement allows the tab assembly to be bent from both the first and second surfaces, thereby reducing the bending stress of the tab assembly. When the tab assembly includes two first sub-regions 2211, the projection of one first sub-region 2211 onto the tab body 100 at least partially overlaps with the projection of the other first sub-region 2211 onto the tab body 100. For example, the projection of one first sub-region 2211 onto the tab body 100 is offset by less than or equal to 0.5 mm from the projection of the other first sub-region 2211 onto the tab body 100. Such an arrangement allows the thinned areas of the two first regions 221 to be staggered, which is beneficial for avoiding stress concentration during the subsequent bending process and improving the service life of the tab body 100 .

[0068] Referring to Figures 4 and 5 , the thickness of the first subregion 2211 is less than the thickness of the second subregion 2212. That is, the thickness t1 of the first subregion 2211 is less than the thickness t2 of the second subregion 2212. In other words, the difference between the thickness t1 of the first subregion 2211 and the thickness t2 of the second subregion 2212 is in the range of 10 μm to 120 μm. For example, the thickness t1 of the first subregion 2211 is in the range of 0.05 μm to 20 μm; and / or the thickness t2 of the second subregion 2212 is in the range of 30 μm to 150 μm. For example, the thickness t1 of the first subregion 2211 is 10 μm, and the thickness t2 of the second subregion 2212 is 40 μm.

[0069] Thus, when the tab assembly is subsequently bent, it can be bent along the first sub-region 2211, reducing the bending stress of the tab assembly. Since the bending stress of the tab assembly is reduced, on the one hand, the bending of the tab assembly can be facilitated, thereby improving the yield of the tab assembly; on the other hand, when the tab assembly is bent, the tab assembly and the protective plate can be bent downward as much as possible, thereby reducing the overall height of the battery and further improving the energy density of the battery 1000.

[0070] Referring to FIG. 2 , in one possible implementation, in the second direction Y (i.e., the direction in which the tab assembly extends), the length L2 of the first subregion 2211 is less than or equal to the length L1 of the second subregion 2212. In other words, the ratio of the length L2 of the first subregion 2211 to the length L1 of the second subregion 2212 is between 1:1 and 1:10. The length L2 of the first subregion 2211 is between 0.1 mm and 1.5 mm, while the length L1 of the second subregion 2212 is between 0.1 mm and 1.0 mm. For example, the length L2 of the first subregion 2211 is 0.5 mm, and the length L1 of the second subregion 2212 is 1 mm. This configuration minimizes the length of the first subregion 2211 while still reducing the bending stress of the tab assembly. This reduces manufacturing complexity and damage to the tab assembly, thereby increasing the lifespan of the tab assembly.

[0071] In one possible implementation, referring again to FIG. 2 , the exposed area 220 further includes a second region 222. In the third direction X, the second region 222 is located on at least one side of the first region 221. As an example, there is one second region 222, located on one side of the first region 221. As another example, there are two second regions 222. In the width direction of the tab body 100, i.e., in the third direction X, the two second regions 222 are located on either side of the first region 221, respectively. The two second regions 222 are symmetrically arranged relative to the tab body 100, such that the thicknesses of the two second regions 222 are substantially equal and the shapes of the two second regions 222 are also identical. It should be noted that the lengths L3 of the two second regions 222 in the extension direction of the tab body 100 may also differ. For example, the difference in the lengths L3 of the two second regions 222 may be between -0.5 mm and 0.5 mm.

[0072] The edge of the second region 222 away from the sealing region 210 can be curved or other shapes. For example, referring to FIG6 , the edge of the second region 222 away from the sealing region 210 can be curved, which can improve the reliability of the battery 1000 during the packaging process.

[0073] In this embodiment, the relative positional relationship between the edge of the first sub-region 2211 away from the sealing area 210 and the edge of the second region 222 away from the sealing area 210 can be implemented in a variety of ways. As an example, please continue to refer to Figures 2 and 3. In the second direction Y, the distance between the edge of the second region 222 away from the sealing area 210 and the edge of the sealing area 210 is the first distance; the distance between the edge of the first sub-region 2211 away from the edge of the second sub-region 2212 and the edge of the sealing area 210 is the second distance; the first distance is smaller than the second distance. Among them, the value range of the first distance is 0.1mm~2.0mm; the value range of the second distance is 0.1~3.0mm. It should be noted that the values ​​of the first distance and the second distance can be freely designed according to actual conditions, but the premise that the first distance is smaller than the second distance needs to remain unchanged.

[0074] It should be understood that, taking the orientation shown in FIG. 2 as an example, the edge of the second region 222 facing away from the sealing region 210 can be understood as the top surface of the second region 222; and the edge of the first subregion 2211 facing away from the second subregion 2212 can be understood as the top surface of the first subregion 2211. Furthermore, the first distance can be L3 in FIG. 2 , and the second distance is the length of the first region 221, i.e., the sum of L1 and L2 in FIG. 2 .

[0075] With such a configuration, the top surface of the second region 222 can be lower than the top surface of the first sub-region 2211; when subsequently bending along the first sub-region 2211, the second region 222 can be avoided as much as possible, further reducing the bending stress of the tab assembly and improving the battery yield.

[0076] In this embodiment, please refer to Figure 2, the edge of the second sub-region 2212 away from the sealing area 210 is lower than the edge of the second region 222 away from the sealing area 210; or, please refer to Figure 7, the edge of the second sub-region 2212 away from the sealing area 210 is higher than the edge of the second region 222 away from the sealing area 210; or, please refer to Figure 10, the edge of the second sub-region 2212 away from the sealing area 210 is flush with the edge of the second region 222 away from the sealing area 210.

[0077] To facilitate a detailed description of the solution of this embodiment, please refer to Figure 2. The edge of the second sub-area 2212 may be divided into a first edge 2212a and a second edge 2212b, and the second edge 2212b is located between the first edge 2212a and the sealing area 210; the second area 222 includes a third edge 2221 and a fourth edge 2222, and the fourth edge 2222 is flush with the second edge 2212b.

[0078] As an example, the first edge 2212a and the third edge 2221 are flush with each other, or the first edge 2212a is lower than the third edge 2221. Such a setting will reduce the difficulty of preparing the first sub-region 2211 and improve the yield of the tab assembly.

[0079] As another example, referring to Figures 7 and 8 , the edge of the second sub-region 2212 facing away from the sealing area 210 is higher than the edge of the second region 222 facing away from the sealing area 210; that is, the first edge 2212a is higher than the third edge 2221. When preparing the sealing layer 200, an initial glue layer can be formed first. Subsequently, a cutout region 240 is formed in the initial glue layer located on both sides of the tab body 100 and outside the battery. The cutout region 240 penetrates the initial glue layer along the thickness direction of the tab body 100. Subsequently, a cutting process is used to remove part of the thickness of the initial glue layer in the area opposite the tab body 100 to form the first sub-region 2211, so that the edge of the second sub-region 2212 facing away from the sealing area 210 is higher than the edge of the second region 222 facing away from the sealing area 210. With such a configuration, when the tab assembly is bent, it can be bent along the first sub-region 2211 , and during the bending process, the second region 222 is not bent, which can reduce the bending stress generated during the bending process as much as possible and improve the yield of the tab assembly.

[0080] In this embodiment, the edge of the second region 222 facing away from the sealing region 210 is connected to the edge of the second sub-region 2212 facing away from the sealing region 210 via an arc surface 250. This arrangement ensures a smooth transition between the edge of the second region 222 facing away from the sealing region 210 and the edge of the second sub-region 2212 facing away from the sealing region 210, thereby improving the reliability of the battery 1000 during the packaging process.

[0081] In one possible implementation, referring to Figures 4 to 6 , the thickness t3 of the second region 222 is greater than the thickness t2 of the second subregion 2212. Specifically, the thickness t3 of the second region 222 is greater than the thickness t2 of the second subregion 2212, and greater than the thickness t1 of the first subregion 2211. The value range of t1 is 0.05 μm to 20 μm; the value range of t2 is 30 μm to 150 μm; and the value range of t3 is 60 μm to 300 μm. This configuration can reduce bending stress when the tab assembly is bent.

[0082] Referring to FIG. 9 , the second region 222 includes a third sub-region 2223 and a fourth sub-region 2224. The third sub-region 2223 is connected to the sealing region 210, and the fourth sub-region 2224 is located on the side of the third sub-region 2223 facing away from the sealing region 210. The thickness of the fourth sub-region 2224 is greater than that of the third sub-region 2223. The thickness of the third sub-region 2223 is denoted as t5, and the thickness of the fourth sub-region 2224 is denoted as t6, with t5 being greater than t6. Furthermore, the thickness t6 of the fourth sub-region 2224 is also greater than the thickness t2 of the second sub-region 2212, and the thickness t2 of the second sub-region 2212 is greater than the thickness t1 of the first sub-region 2211. This arrangement not only reduces stress generated during the bending process and improves the yield of the tab assembly, but also utilizes the second region 222 to provide support for the tab body 100, improving the reliability of the battery packaging.

[0083] Referring to FIG. 10 , in one possible implementation, along the direction from the second region 222 to the first region 221, that is, along the X direction in FIG. 10 , the distance between the edge of the second region 222 facing away from the sealing region 210 and the sealing region 210 gradually increases. In other words, the distance between the third edge 2221 and the fourth edge 2222 gradually increases. This arrangement reduces the difficulty in fabricating the second region 222 and improves the battery packaging reliability.

[0084] Continuing with FIG9 , the fourth sub-region 2224 has an arcuate surface on the side facing away from the sealing area 210. For example, the fourth sub-region 2224 is a semicircular structure. This configuration improves the smoothness of the fourth sub-region 2224, reduces or even eliminates the risk of scratching the electrode assembly or other parts of the battery, and improves the battery yield.

[0085] Referring to Figures 2 and 4 , in one possible implementation, the sealing layer 200 further includes an inner sealing region 230, which is disposed at the end of the sealing region 210 facing away from the exposed region 220. The inner sealing region 230 is located within the battery. The thickness t7 of the inner sealing region 230 is equal to the thickness t2 of the first subregion 2211. This configuration improves the thickness uniformity of the sealing layer 200 beyond the first subregion 2211, thereby reducing the bending stress during the bending of the tab assembly.

[0086] In one possible implementation, referring to Figures 11 and 12 , the battery 1000 further includes a protective plate 600 . The end of the tab assembly facing away from the cell 700 extends outside the package 500 , and the end of the tab assembly facing away from the electrode of the cell 700 is bent around the first sub-region 2211 to form a bent portion 260 ; the bent portion 260 is connected to the protective plate 600 . This arrangement allows the tab assembly and protective plate 600 to bend downward as much as possible, thereby reducing the overall height of the battery 1000 and thereby improving the energy density of the battery 1000 .

[0087] In one possible implementation, the first subregion 2211 includes a first portion and a second portion connected to the first portion. That is, the first subregion 2211 is divided into a first portion and a second portion. The first portion and the second portion can be connected sequentially, or other options are possible. For example, there can be two first portions, each located on either side of the second portion. During the bending process of the tab assembly, the tab assembly can be bent along the second portion so that the second portion is located within the bend. This arrangement allows for precise control of the bending position of the tab assembly, thereby improving the yield of the tab assembly.

[0088] Referring to FIG. 12 , the bend portion 260 includes a first bend portion 261 and a second bend portion 262. The first bend portion 261 is parallel to the width direction of the tab body 100, that is, the first bend portion 261 is parallel to the X-direction. The second bend portion 262 is connected to the first bend portion 261 and is parallel to the extension direction of the tab body 100. In this case, the second portion can be located within the first bend portion 261 and at the end of the first bend portion 261.

[0089] The protective plate 600 is connected to the second bent portion 262, and the projection of the protective plate 600 on the sealing layer 200 overlaps with the second sub-region. This arrangement shortens the distance between the first bent portion 261 and the package body 500, improving the tightness of the assembly between the protective plate 600 and the battery 1000, reducing the overall height of the battery 1000, and thereby increasing the energy density of the battery 1000.

[0090] In this embodiment, the height of the package body 500 is higher than the height of the protection plate 600 . This configuration can reduce the overall height of the battery 1000 as much as possible, thereby increasing the energy density of the battery 1000 .

[0091] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present application that follow the general principles of the present application and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered as exemplary only, and the true scope and spirit of the present application are indicated by the following claims.

[0092] It should be understood that the present application is not limited to the exact structure described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A battery, characterized in that: It comprises a package, a battery cell and a tab assembly, wherein the battery cell is arranged in the package; a part of the tab assembly is located in the package and connected to the battery cell, and a part of the tab assembly extends out of the package; The tab assembly comprises a tab body and a sealing layer located between the package body and the tab body, wherein the sealing layer wraps a portion of the outer circumference of the tab body, and along a first direction, a first surface and a second surface of the sealing layer which are arranged opposite to each other respectively comprise an exposed area extending out of the package body and a sealing area connected to the package body; The exposed areas all include a first region arranged opposite to the tab body, and at least one of the first regions includes a first sub-region and a second sub-region connected to each other, and a thickness of the first sub-region is less than a thickness of the second sub-region.

2. The battery according to claim 1, characterized in that In the second direction, the second sub-region is located between the first sub-region and the sealing area.

3. The battery according to claim 1, characterized in that The thickness difference between the first sub-region and the second sub-region ranges from 10 μm to 120 μm.

4. The battery according to claim 1, characterized in that The first area of ​​the first surface and the first area of ​​the second surface each include a first sub-area and a second sub-area.

5. The battery according to claim 4, characterized in that A projection area of ​​one of the first sub-regions on the tab body at least partially overlaps with a projection area of ​​another of the first sub-regions on the tab body.

6. The battery according to claim 5, characterized in that A misalignment dimension between a projection area of ​​one of the first sub-regions on the tab body and a projection area of ​​another of the first sub-regions on the tab body is less than or equal to 0.5 mm.

7. The battery according to claim 1, characterized in that In the second direction, a ratio of a length L2 of the first sub-region to a length L1 of the second sub-region is in a range of 1:1-1:

10.

8. The battery according to claim 7, characterized in that The length L2 of the first sub-region is between 0.1 mm and 1.0 mm; and / or the length L1 of the second sub-region is between 0.1 mm and 1.5 mm.

9. The battery according to any one of claims 1 to 8, characterized in that: The exposed area further includes a second region; in the third direction, the second region is at least located on one side of the first region.

10. The battery according to claim 9, characterized in that In the second direction, the distance between the edge of the second region away from the sealing area and the edge of the sealing area is a first distance; the distance between the edge of the first subregion away from the second subregion and the edge of the sealing area is a second distance; the first distance is smaller than the second distance.

11. The battery according to claim 10, characterized in that The value range of the first distance is 0.1 mm to 2.0 mm; the value range of the second distance is 0.1 mm to 3.0 mm.

12. The battery according to claim 10, characterized in that The thickness t3 of the second region is greater than the thickness t2 of the second sub-region.

13. The battery according to claim 12, characterized in that The thickness of the first sub-region is t1; wherein the value range of t1 is 0.05 μm to 20 μm; and / or the value range of t2 is 30 μm to 150 μm; and / or the value range of t3 is 60 μm to 300 μm.

14. The battery according to claim 9, characterized in that The edge of the second sub-region facing away from the sealing area is higher than the edge of the second region facing away from the sealing area.

15. The battery according to claim 14, characterized in that An edge of the second region away from the sealing area is connected to an edge of the second sub-region away from the sealing area via an arc surface.

16. The battery according to claim 9, characterized in that The second area includes a third sub-area and a fourth sub-area, the third sub-area is connected to the sealing area, and the fourth sub-area is arranged on a side of the third sub-area away from the sealing area; The thickness of the fourth sub-region is greater than the thickness of the third sub-region.

17. The battery according to claim 16, characterized in that Along the direction from the second area to the first area, the distance between the edge of the second area away from the sealing area and the sealing area gradually increases.

18. The battery according to claim 16, characterized in that The fourth sub-region has an arc-shaped surface on a side facing away from the sealing area.

19. The battery according to any one of claims 1 to 8, characterized in that: The sealing layer further includes an inner sealing area located in the package body, and a thickness t7 of the inner sealing area is greater than a thickness t1 of the first sub-area.

20. The battery according to any one of claims 1 to 8, characterized in that: It also includes a protection plate; the end of the pole ear component away from the battery cell extends to the outside of the packaging body, and the end of the pole ear component away from the pole piece of the battery cell is bent around the first sub-region to form a bending portion; the protection plate is connected to the bending portion.

21. The battery according to claim 20, characterized in that The first sub-region includes a first portion and a second portion connected to the first portion, and the second portion is located at the bending portion.

22. An electrical device, characterized in that: A battery comprising any one of claims 1 to 20.

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