Battery

Abstract

This application provides a battery comprising: an electrode assembly; a packaging bag encapsulating the electrode assembly; and a plurality of adhesive portions, the plurality of adhesive portions being at least partially spaced apart and located between the packaging bag and the electrode assembly. This application aims to provide a battery that reduces the risk of aluminum foil tearing and improves safety performance.

Description

[0001] This application is a divisional application of the original invention patent application (filing date is December 11, 2018, application number is 201811510802.1, and the invention name is "Battery"). Technical Field

[0002] The present application relates to the field of power supplies, and more specifically, to a battery. Background Art

[0003] Batteries are widely used in electronic products to provide their power. Electronic products, especially mobile electronics, are subject to drops and other hazards during use, necessitating the protection of battery components from such drops. Therefore, during battery production, the packaging and electrode assembly must be secured to prevent significant relative displacement during drops, potentially leading to damage.

[0004] In the current battery production process, glue is used to bond the packaging shell and the electrodes inside to achieve a secure connection. However, during drops and other processes, there are still problems such as the outermost aluminum foil of the electrode assembly tearing, which affects battery safety. Summary of the Invention

[0005] In response to the problems existing in the related art, the purpose of this application is to provide a battery that reduces the risk of aluminum foil tearing and improves safety performance.

[0006] To achieve the above objectives, the present application provides a battery, comprising: an electrode assembly; a packaging bag, which encapsulates the electrode assembly; and a plurality of bonding parts, which are at least partially spaced apart and located between the packaging bag and the electrode assembly.

[0007] According to an embodiment of the present application, the thickness of each of the plurality of adhesive portions is between 1 um and 50 um.

[0008] According to one embodiment of the present application, the electrode assembly includes a first electrode piece and a second electrode piece, and a bonding layer is provided between the first electrode piece and the second electrode piece.

[0009] According to one embodiment of the present application, the plurality of bonding portions are arranged in an array.

[0010] According to one embodiment of the present application, the plurality of bonding portions are arranged in one of a dot array and a strip array.

[0011] According to one embodiment of the present application, the plurality of bonding portions are arranged in a dot array, and along the diagonal direction of the battery, the closest distance between two adjacent bonding portions is in the range of 0 to 100 mm (0 refers to a continuous large piece of adhesive), preferably 0.1 to 40 mm, more preferably 0.2 to 20 mm, and even more preferably 0.3 to 10 mm, and the above numerical ranges are inclusive of the endpoints.

[0012] According to one embodiment of the present application, a plurality of bonding portions are arranged in a dot array, wherein, along the length direction of the battery, the spacing between two adjacent bonding portions is in the range of 0 to 500 mm (0 refers to a continuous large piece of adhesive), preferably 0.1 to 100 mm, more preferably 0.5 to 70 mm, more preferably 0.8 to 30 mm, and more preferably 1 to 10 mm; and along the width direction of the battery, the spacing between two adjacent bonding portions is in the range of 0 to 100 mm, preferably 0.1 to 80 mm, more preferably 0.3 to 60 mm, and even more preferably 0.5 to 30 mm. The above numerical ranges all include the endpoint values.

[0013] According to one embodiment of the present application, along the length direction of the battery, the spacing between the topmost adhesive portion and the top edge of the battery is in the range of 0 to 100 mm (0 refers to a continuous large piece of adhesive), preferably 0.1 to 50 mm, more preferably 0.2 to 10 mm, and more preferably 0.3 to 5 mm; and along the width direction of the battery, the spacing between the outermost adhesive portion and the side edge of the battery is in the range of 0 to 100 mm, preferably 0.1 to 50 mm, more preferably 0.2 to 10 mm, and more preferably 0.3 to 8 mm. The above numerical ranges are all inclusive.

[0014] According to one embodiment of the present application, the bonding portion is circular, and the radius of the bonding portion is in the range of 0.1 to 500 mm, preferably 0.2 to 300 mm, more preferably 0.3 to 50 mm, and even more preferably 0.4 to 10 mm. The above numerical ranges all include endpoints.

[0015] According to one embodiment of the present application, the bonding portion is rectangular and includes a first side extending along the width direction of the battery and a second side extending along the length direction of the battery, wherein the length of the first side is in the range of 0.1 to 1000 mm, preferably 0.2 to 160 mm, more preferably 0.3 to 90 mm; and the length of the second side is in the range of 0 to 1000 mm, preferably 0.1 to 150 mm, more preferably 0.3 to 90 mm. The above numerical ranges are all inclusive.

[0016] According to one embodiment of the present application, the bonding portion is triangular in shape, wherein the height of the bonding portion along the length direction of the battery is in the range of 0.1 to 1000 mm, preferably 0.2 to 150 mm, more preferably 0.3 to 90 mm, and the base angle of the bonding portion is in the range of 0.1° to 90°, preferably 0.2° to 60°, and more preferably 0.3° to 30°. The above numerical ranges are all inclusive.

[0017] According to one embodiment of the present application, the plurality of adhesive portions form a plurality of adhesive units extending along a first direction of the electrode assembly, each adhesive unit includes a plurality of adhesive portions partially overlapping along a thickness direction of the battery, and adjacent adhesive units are spaced apart.

[0018] According to one embodiment of the present application, the first direction includes any one of a length direction, a width direction, and a diagonal direction of the electrode assembly.

[0019] According to one embodiment of the present application, each of the plurality of bonding portions has the same shape and size.

[0020] According to one embodiment of the present application, the total area of ​​the plurality of bonding portions accounts for 5% to 100% of the surface area of ​​the electrode assembly.

[0021] According to one embodiment of the present application, along a thickness direction of the battery, the electrode assembly includes a first outer surface and a second outer surface, and a plurality of adhesive portions are provided on at least one of the first outer surface and the second outer surface.

[0022] The beneficial technical effects of this application are at least:

[0023] By setting up multiple bonding parts and positioning them relatively freely, the shear stress can be greatly dispersed, and the force on the battery when it falls is more evenly distributed, which reduces stress concentration, reduces the risk of tearing of the outermost aluminum foil of the electrode assembly, and improves battery safety performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the battery decomposition of this application;

[0025] Figure 2 is a schematic diagram of an embodiment of the present application;

[0026] Figure 3 yes Figure 2 A partial schematic diagram of the bonding portion of the illustrated embodiment;

[0027] Figure 4 is a schematic diagram of another embodiment of the present application;

[0028] Figure 5 yes Figure 4 Partial schematic diagram of the bonding portion of the embodiment shown

[0029] Figure 6 is a schematic diagram of another embodiment of the present application;

[0030] Figure 7 yes Figure 6 A partial schematic diagram of the bonding portion of the illustrated embodiment;

[0031] Figure 8 is a schematic diagram of another embodiment of the present application;

[0032] Figure 9 This is a schematic diagram of another embodiment of the present application

[0033] Figure 10 is a schematic diagram of yet another embodiment of the present application;

[0034] Figure 11 is a schematic diagram of another embodiment of the present application;

[0035] Figure 12 It is a schematic diagram of another embodiment of the present application. DETAILED DESCRIPTION

[0036] The following is combined with the accompanying drawings Figures 1 to 12 The embodiments of the present application are described in detail. It should be noted that, hereinafter, "along the length direction of the battery 10" refers to the direction of arrow L, and "along the width direction of the battery 10" refers to the direction of arrow W. Furthermore, the terms "larger" and "smaller" used to describe dimensions are not numerically limited and may be redefined based on different usage scenarios of the battery 10.

[0037] In one embodiment of the present application, the battery 10 includes: an electrode assembly 12; a packaging bag 11, which encapsulates the electrode assembly 12; and a plurality of adhesive portions 14, which are at least partially spaced apart and located between the packaging bag 11 and the electrode assembly 12.

[0038] In this embodiment, multiple adhesive portions 14 are provided. This not only increases the area of ​​the adhesive portions 14 but also disperses the forces acting on the battery 10 during a drop, reducing stress concentration and the risk of aluminum foil tearing. Furthermore, the spacing of at least some of the adhesive portions 14 facilitates uniform thickness across the battery 10, avoiding poor interface performance of the electrode assembly 12 and reduced cycling performance caused by uneven thickness.

[0039] In one embodiment of the present application, the thickness of each of the plurality of adhesive portions 14 is between 1 μm and 50 μm. This relatively thin thickness can reduce the degree of reduction in the energy density of the battery 10 without reducing the adhesive force.

[0040] In addition, in one or more embodiments, the thickness of each bonding portion 14 is preferably set to be between 35 μm and 50 μm, which only causes a 1% to 4% loss in energy density, thus further helping to improve the performance of the battery 10 .

[0041] In one embodiment of the present application, the electrode assembly 12 includes a first electrode sheet and a second electrode sheet, with an adhesive layer (not shown) disposed between the first electrode sheet and the second electrode sheet. In this embodiment, the adhesive layer allows the first electrode sheet and the second electrode sheet to be more tightly bonded, thereby forming the electrode assembly 12 into a tightly integrated whole. The electrode assembly 12 and the packaging bag form a solid battery 10 through the adhesive portion 14. This improves the battery 10's tearing resistance when dropped and also improves the battery's cycling performance.

[0042] In one embodiment of the present application, the bonding layer provided between the first pole piece and the second pole piece is located on the surface of the first pole piece.

[0043] In one embodiment of the present application, the bonding layer provided between the first pole piece and the second pole piece is located on the surface of the second pole piece.

[0044] In one embodiment of the present application, the adhesive layer provided between the first pole piece and the second pole piece is located on the surface of the isolation film between the first pole piece and the second pole piece.

[0045] In one embodiment of the present application, a plurality of adhesive portions 14 are arranged in an array. In this embodiment, all adhesive portions 14 may be arranged in an array, or only some of the adhesive portions 14 may be arranged in an array. During the falling process of the battery 10, the array arrangement helps to evenly distribute the force, reduce stress concentration, and reduce the risk of tearing of the aluminum foil. When only some of the adhesive portions 14 are arranged in an array, the other part can be arranged freely. In other words, the other part can be distributed in a focused manner in areas where the aluminum foil is prone to tearing. This not only reduces the risk of tearing of the aluminum foil, but also reduces the amount of glue used, thereby reducing the impact on the energy density of the battery 10 and further improving the performance of the battery 10.

[0046] In one embodiment of the present application, the plurality of adhesive portions 14 are arranged in either a dot array or a strip array. The advantage of the dot array arrangement is that the distribution is wide and more uniform, which helps reduce the risk of aluminum foil tearing. The advantage of the strip array arrangement is that the adhesive portions 14 are continuous, which helps to achieve the adhesive portions 14 being concentrated in areas prone to tearing of the aluminum foil, also helping to reduce the risk of aluminum foil tearing. Of course, in other embodiments, a combination of dot array and strip array arrangements can be used.

[0047] In one embodiment of the present application, the plurality of adhesive portions 14 are arranged in a dot array, and along the diagonal direction of the battery 10, the closest distance between two adjacent adhesive portions 14 (i.e., the first diagonal distance m and the second diagonal distance n) is in the range of 0 to 100 mm (0 refers to a continuous large piece of adhesive). Preferably, it is 0.1 to 40 mm, more preferably 0.2 to 20 mm, and even more preferably 0.3 to 10 mm, and the above numerical ranges are inclusive of the endpoints.

[0048] In this embodiment, controlling both the first diagonal distance m and the second diagonal distance n within the aforementioned ranges can improve the stress on the battery 10 during a drop, helping to address the issue of lateral peeling forces causing the outermost layer of the electrode assembly 12 to tear during a drop. This helps improve the performance of the battery 10.

[0049] In one embodiment of the present application, a plurality of adhesive portions 14 are arranged in a dot array, wherein, along the length direction of the battery 10, the spacing between two adjacent adhesive portions 14 (i.e., the longitudinal spacing X) is in the range of 0 to 500 mm (0 refers to a continuous large piece of glue), preferably 0.1 to 100 mm, more preferably 0.5 to 70 mm, more preferably 0.8 to 30 mm, and more preferably 1 to 10 mm. And along the width direction of the battery 10, the spacing between two adjacent adhesive portions 14 (i.e., the transverse spacing Y) is in the range of 0 to 100 mm, preferably 0.1 to 80 mm, further preferably 0.3 to 60 mm, and further preferably 0.5 to 30 mm. The above numerical ranges all include endpoint values. In this embodiment, by controlling the size of the longitudinal spacing X and / or the transverse spacing Y, it is helpful to control the density of the adhesive portions 14 in a certain area. That is, if it is necessary to focus on distributing the adhesive portions 14 in the area where the aluminum foil is easy to tear, then the values ​​of the longitudinal spacing X and / or the transverse spacing Y can be smaller, or even 0. If the aluminum foil is not easily torn, the longitudinal spacing X and / or the transverse spacing Y can be larger, which reduces the amount of glue used and avoids the increase in energy density loss of the battery 10 due to excessive glue.

[0050] In one embodiment of the present application, along the length direction of the battery 10, the spacing between the topmost adhesive portion 14 and the top edge of the battery 10 (i.e., top spacing A) is in the range of 0 to 100 mm (0 refers to a continuous large piece of adhesive), preferably 0.1 to 50 mm, more preferably 0.2 to 10 mm, and more preferably 0.3 to 5 mm. Furthermore, along the width direction of the battery 10, the spacing between the outermost adhesive portion 14 and the side edge of the battery 10 (i.e., side spacing Z) is in the range of 0 to 100 mm (0 refers to a continuous large piece of adhesive), preferably 0.1 to 50 mm, more preferably 0.2 to 10 mm, and more preferably 0.3 to 8 mm. The above numerical ranges all include the endpoints.

[0051] In this embodiment, controlling both the top spacing A and the side spacing Z within the aforementioned ranges helps improve the performance of the battery 10's edges. Specifically, the edges of the battery 10 are prone to impact, requiring maximum adhesion. Therefore, both the top spacing A and the side spacing Z are controlled within a range of 0 to 100 mm. This range effectively strengthens adhesion around the battery 10 while minimizing the loss of energy density in the battery 10 due to excessive adhesive.

[0052] In one embodiment of the present application, the bonding portion 14 is circular, and the radius of the bonding portion 14 (i.e., radius r) is in the range of 0.1 to 500 mm, preferably 0.2 to 300 mm, more preferably 0.3 to 50 mm, and more preferably 0.4 to 10 mm. The above numerical ranges all include endpoint values. In this embodiment, when the radius r of the bonding portion 14 is small, the bonding portion 14 can be arranged in a point array form, so that the stress dispersion of the battery 10 during the falling process is more uniform; when the radius r of the bonding portion 14 is large, the bonding portion 14 can be distributed in a focused manner at the part of the aluminum foil that is easy to tear, so as to enhance the firmness of the part that is easy to tear. Of course, in some embodiments, the two methods of arrangement in a point array form and focused distribution at the part that is easy to tear can be combined.

[0053] In one embodiment of the present application, the bonding portion 14 is rectangular and includes a first side a extending along the width direction of the battery 10 and a second side b extending along the length direction of the battery 10. The length of the first side a is in the range of 0.1 to 1000 mm, preferably 0.2 to 160 mm, and more preferably 0.3 to 90 mm; and the length of the second side b is in the range of 0 to 1000 mm, preferably 0.1 to 150 mm, and more preferably 0.3 to 90 mm. The above numerical ranges are inclusive.

[0054] In this embodiment, when the first side a and the second side b of the adhesive portion 14 are relatively small, the adhesive portion 14 can be arranged in a dot array to more evenly distribute stress during a drop of the battery 10. When the first side a and / or the second side b of the adhesive portion 14 are relatively large, the adhesive portion 14 can be arranged in a strip array, with the adhesive portion 14 being distributed primarily at locations prone to tearing, thereby strengthening the security of the areas prone to tearing. Of course, in some embodiments, a combination of the dot array and the strip array can be employed.

[0055] In one embodiment of the present application, the bonding portion 14 is triangular in shape, wherein the height h of the bonding portion 14 along the length direction of the battery 10 is in the range of 0.1 to 1000 mm, preferably 0.2 to 150 mm, and the base angle d of the bonding portion 14 is in the range of 0.1° to 90°, preferably 0.2° to 60°, and more preferably 0.3° to 30°. The above numerical ranges are inclusive of the endpoints.

[0056] In this embodiment, when the height h of the adhesive portion 14 is small, the adhesive portion 14 can be arranged in a dot array to make the stress distribution of the battery 10 more uniform during the drop process; when the height h of the adhesive portion 14 is large, the adhesive portion 14 can be arranged in a strip array, with a focus on the parts of the aluminum foil that are prone to tearing, so as to enhance the firmness of the parts that are prone to tearing. Of course, in some embodiments, the dot array and strip array arrangements can be combined. In addition, controlling the bottom angle d of the adhesive portion 14 within the range of 0.1° to 90° helps control the density of the adhesive portion 14 and avoids the problem of a large area without glue due to an obtuse angle, which causes the aluminum foil to tear easily.

[0057] In one embodiment of the present application, the plurality of bonding portions 14 form a plurality of bonding units extending along a first direction of the electrode assembly 12 , each bonding unit includes a plurality of bonding portions 14 partially overlapping along a thickness direction of the battery 10 , and adjacent bonding units are spaced apart.

[0058] In this embodiment, the multiple bonding portions 14 overlap along the first direction of the electrode assembly 12, meaning the longitudinal spacing X is 0 mm. Furthermore, the first diagonal distance m = 0 mm, and the second diagonal distance n = 0 mm. This arrangement connects the multiple bonding units extending along the first direction of the electrode assembly 12 into a strip-like array of bonding portions 14, which helps to focus on areas prone to tearing of the aluminum foil, thereby enhancing the security of these areas.

[0059] In one embodiment of the present application, the first direction includes any one of the length, width, and diagonal directions of the electrode assembly 12. In this embodiment, the bonding portion 14 can be flexibly configured to meet different usage scenarios of the battery 10, thereby improving the performance of the battery 10.

[0060] In one embodiment of the present application, each of the plurality of adhesive portions 14 has the same shape and size. In this embodiment, the same shape and size help evenly distribute the stress of the battery 10 during the drop process, effectively avoiding stress concentration and preventing the aluminum foil from tearing.

[0061] Of course, in other embodiments, only some of the bonding portions 14 may have the same shape and size, or the shapes and sizes of any bonding portion 14 may be different. In other words, there is no limitation in this application, and the design can be optimized according to the actual use environment of the battery 10.

[0062] In one embodiment of the present application, the total area of ​​the multiple adhesive portions 14 accounts for 5% to 100% of the surface area of ​​the electrode assembly 12. In this embodiment, the adhesive portions 14 cover a wide range, nearly completely covering the electrode assembly 12, which helps prevent the aluminum foil from tearing and enhances the overall strength of the battery 10. This embodiment is particularly suitable for scenarios where high strength requirements are placed on the battery 10.

[0063] In one embodiment of the present application, the electrode assembly 12 includes a first outer surface and a second outer surface along the thickness direction of the battery 10, and a plurality of adhesive portions 14 are provided on at least one of the first outer surface and the second outer surface. In this embodiment, the adhesive portions 14 are provided on both the first and second outer surfaces of the electrode assembly 12, thereby strengthening the internal bonding of the battery 10, preventing the aluminum foil from tearing, and improving the performance of the battery 10.

[0064] The present application will be described in detail below with reference to the accompanying drawings.

[0065] like Figure 1 As shown, in one embodiment of the present application, a battery 10 includes an electrode assembly 12 and a packaging bag 11 that encapsulates the electrode assembly 12 .

[0066] like Figure 2 As shown, in one embodiment of the present application, each adhesive portion 14 is configured in a rectangular shape, and the adhesive portions 14 are arranged in a dotted array. The longitudinal spacing X between two adjacent adhesive portions 14 along the length of the battery 10 is within a range of 0 to 500 mm; the transverse spacing Y between two adjacent adhesive portions 14 along the width of the battery 10 is within a range of 0 to 100 mm; the first diagonal distance m and the second diagonal distance n between two adjacent adhesive portions 14 along the diagonal direction of the battery 10 are both within a range of 0 to 100 mm; the top spacing A between the topmost adhesive portion 14 and the top edge of the battery 10 along the length of the battery 10 is within a range of 0 to 100 mm; and the side spacing Z between the outermost adhesive portion 14 and the side edge of the battery 10 along the width of the battery 10 is within a range of 0 to 100 mm. In this embodiment, by controlling the above spacing, tearing of the aluminum film can be effectively prevented, ensuring a secure bond within the battery 10, while minimizing the reduction in the energy density of the battery 10.

[0067] Figure 3 yes Figure 2Schematic diagram of a bonding portion 14 in an embodiment. Bonding portion 14 is rectangular, with a first side a ranging from 0.1 to 1000 mm and a second side b ranging from 0 to 1000 mm. Bonding portions 14 within this size range can be arranged in a dot array or a strip array, which helps reduce the risk of aluminum foil tearing.

[0068] like Figure 4 As shown, in the second embodiment of the present application, each adhesive portion 14 is circular in shape, and the adhesive portions 14 are arranged in a dotted array. Similarly, along the length of the battery 10, the longitudinal spacing X between two adjacent adhesive portions 14 is within a range of 0 to 500 mm; along the width of the battery 10, the transverse spacing Y between two adjacent adhesive portions 14 is within a range of 0 to 100 mm; along the diagonal direction of the battery 10, the first diagonal distance m and the second diagonal distance n between two adjacent adhesive portions 14 are both within a range of 0 to 100 mm; along the length of the battery 10, the top spacing A between the topmost adhesive portion 14 and the top edge of the battery 10 is within a range of 0 to 100 mm; along the width of the battery 10, the side spacing Z between the outermost adhesive portion 14 and the side edge of the battery 10 is within a range of 0 to 100 mm. In this embodiment, by controlling the above spacing, the aluminum film can be effectively prevented from tearing, ensuring a strong bond within the battery 10, while also minimizing the reduction in the energy density of the battery 10.

[0069] Figure 5 yes Figure 4 Schematic diagram of a bonding portion 14 in an embodiment. Bonding portion 14 is circular, with a radius r ranging from 0.1 to 500 mm. Bonding portions 14 within this size range can be arranged in a dot array or a strip array, which helps reduce the risk of aluminum foil tearing.

[0070] like Figure 6As shown, in the third embodiment of the present application, each adhesive portion 14 is arranged in a triangular shape, and the adhesive portions 14 are arranged in a dotted array. Similarly, along the length of the battery 10, the longitudinal spacing X between two adjacent adhesive portions 14 is within a range of 0 to 500 mm; along the width of the battery 10, the transverse spacing Y between two adjacent adhesive portions 14 is within a range of 0 to 100 mm; along the diagonal direction of the battery 10, the first diagonal distance m and the second diagonal distance n between two adjacent adhesive portions 14 are both within a range of 0 to 100 mm; along the length of the battery 10, the top spacing A between the topmost adhesive portion 14 and the top edge of the battery 10 is within a range of 0 to 100 mm; along the width of the battery 10, the side spacing Z between the outermost adhesive portion 14 and the side edge of the battery 10 is within a range of 0 to 100 mm. In this embodiment, by controlling the above spacing, the aluminum film can be effectively prevented from tearing, ensuring a strong bond within the battery 10, while also minimizing the reduction in the energy density of the battery 10.

[0071] Figure 7 yes Figure 6 A schematic diagram of a bonding portion 14 in an embodiment of the present invention is shown. Bonding portion 14 is triangular in shape, with a height h ranging from 0.1 to 1000 mm and a base angle ranging from 0.1° to 90°. Bonding portions 14 within this size range can be arranged in a dot array or a strip array, which helps reduce the risk of aluminum foil tearing.

[0072] like Figure 8 As shown, in the fourth embodiment of the present application, each adhesive portion 14 is configured to be elliptical, and the adhesive portions 14 are arranged in a dot array. Of course, in other embodiments, the shapes and sizes of each adhesive portion 14 can be partially the same or completely different, and the technical effects of the above embodiments can also be achieved.

[0073] like Figure 9 As shown, in the fifth embodiment of the present application, each adhesive portion 14 is configured as a pentagon, and the adhesive portions 14 are arranged in a dot array. Of course, in other embodiments, the shapes and sizes of each adhesive portion 14 can be partially the same or completely different, and the technical effects of the above embodiments can also be achieved.

[0074] like Figure 10 As shown, in the sixth embodiment of the present application, each adhesive portion 14 is configured to be of a different shape, and the adhesive portions 14 are arranged in a dot array. Of course, in other embodiments, the shapes and sizes of each adhesive portion 14 can be partially the same or completely different, and the technical effects of the above embodiments can also be achieved.

[0075] like Figure 11As shown, in the seventh embodiment of the present application, the adhesive portions 14 are arranged in a strip array along the width direction of the battery 10. This helps to ensure that the adhesive portions 14 are concentrated in areas where the aluminum foil is prone to tearing, thereby reducing the risk of aluminum foil tearing. In other embodiments, the adhesive portions 14 can also be arranged in a strip array along the length direction or diagonal direction of the battery 10.

[0076] like Figure 12 As shown, in the eighth embodiment of the present application, the adhesive portions 14 are arranged in a strip array along the length of the battery 10. This helps to ensure that the adhesive portions 14 are concentrated in areas where the aluminum foil is prone to tearing, thereby reducing the risk of aluminum foil tearing. In other embodiments, the adhesive portions 14 can also be arranged in a strip array along the width or diagonal direction of the battery 10.

[0077] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A battery comprising: electrode assembly; as well as A packaging bag, wherein the packaging bag encapsulates the electrode assembly; wherein The battery further includes a plurality of adhesive portions, the plurality of adhesive portions being at least partially spaced apart and located between the packaging bag and the electrode assembly; Wherein, along the length direction of the battery, the distance between the topmost bonding portion and the top edge of the battery is in the range of 0.1 to 100 mm, and along the width direction of the battery, the distance between the outermost bonding portion and the side edge of the battery is in the range of 0.1 to 100 mm; The electrode assembly and the packaging bag are bonded and fixed via the plurality of bonding portions; The plurality of bonding portions are arranged in an array; Along the length direction of the battery, the distance between two adjacent bonding portions is within the range of 0.1 to 100 mm, and along the width direction of the battery, the distance between two adjacent bonding portions is within the range of 0.1 to 80 mm.

2. The battery according to claim 1, wherein The thickness of each of the plurality of bonding portions is between 1 um and 50 um.

3. The battery according to claim 1, wherein The electrode assembly includes a first electrode piece and a second electrode piece, and a bonding layer is provided between the first electrode piece and the second electrode piece.

4. The battery according to claim 1, wherein The plurality of bonding portions are arranged in a dot array or a strip array.

5. The battery according to claim 1, wherein The plurality of bonding portions are arranged in a dot array, and along a diagonal direction of the battery, the closest distance between two adjacent bonding portions is within a range of 0 to 100 mm.

6. The battery according to claim 1, wherein The bonding portion is circular in shape, and a radius of the bonding portion is within a range of 0.1 to 500 mm.

7. The battery according to claim 1, wherein The bonding portion is rectangular in shape and includes a first side extending along the width direction of the battery and a second side extending along the length direction of the battery, wherein the length of the first side is in the range of 0.1 to 1000 mm; and the length of the second side is in the range of 0 to 1000 mm.

8. The battery according to claim 1, wherein The bonding portion is triangular in shape, wherein a height of the bonding portion along a length direction of the battery is in a range of 0.1 to 1000 mm; and a base angle of the bonding portion is in a range of 0.1° to 90°.

9. The battery according to claim 1, wherein The plurality of adhesive portions form a plurality of adhesive units extending along a first direction of the electrode assembly. Each adhesive unit includes a plurality of adhesive portions partially overlapping along a thickness direction of the battery. Adjacent adhesive units are spaced apart.

10. The battery according to claim 9, wherein The first direction includes any one of a length direction, a width direction, and a diagonal direction of the electrode assembly.

11. The battery according to claim 1, wherein Each of the plurality of bonding portions has the same shape and size.

12. The battery according to claim 1, wherein The total area of ​​the plurality of bonding portions accounts for 5% to 100% of the surface area of ​​the electrode assembly.

13. The battery according to claim 1, wherein The electrode assembly includes a first outer surface and a second outer surface along a thickness direction of the battery, and the plurality of adhesive portions are provided on at least one of the first outer surface and the second outer surface.

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