A battery

Abstract

This application provides a battery, comprising: a casing having an opening; a top cover closing onto the opening and connected to the casing; a patch covering the top of the top cover and connected to the top cover; an insulating film covering the outer surface of the casing, including two first insulating portions disposed opposite each other in a first direction and two second insulating portions disposed opposite each other in a second direction; along the height direction of the casing, the portion of each first insulating portion and second insulating portion extending beyond the top cover is bent toward the central region of the top cover, respectively forming a first folded edge portion connected to the top cover and a second folded edge portion connected to the top cover, the first folded edge portion and the second folded edge portion overlapping between the top cover and the patch to form an overlapping structure; an adsorption structure disposed between the top cover and the patch; the overlapping structure being connected to the patch through the adsorption structure; this application enhances the connection strength between the patch and the overlapping structure by adding an adsorption structure, preventing warping at the top corner of the patch.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more particularly to a battery. Background Technology

[0002] In the manufacturing process of lithium-ion batteries, a patch needs to be attached to the top cover, and an insulating film needs to be wrapped around the outer surface of the casing and the edge of the top cover to form an overlapping area, thereby enhancing the battery's insulation performance and corrosion resistance. Due to the characteristics of the insulating film material and the wrapping method, the insulating film in the overlapping area has a multi-layer overlapping structure, and the overlapping structure exerts a pushing force on the top corner of the patch, which causes the top corner of the patch to warp. Utility Model Content

[0003] In view of the above, this application aims to provide a battery that solves some or all of the aforementioned technical problems.

[0004] For the purposes described above, this application provides a battery, comprising:

[0005] The shell has an opening;

[0006] A top cover that closes to the opening and is connected to the housing;

[0007] A patch is applied to the top of the top cover and connected to the top cover;

[0008] An insulating film, covering the outer surface of the housing, includes two first insulating portions disposed opposite each other in a first direction, and two second insulating portions disposed opposite each other in a second direction; along the height direction of the housing, the portion of the first insulating portion extending beyond the top cover is bent toward the central region of the top cover to form a first folded edge portion and connected to the top cover, the portion of the second insulating portion extending beyond the top cover is bent toward the central region of the top cover to form a second folded edge portion and connected to the top cover, the first folded edge portion and the second folded edge portion overlap between the top cover and the patch to form an overlapping structure;

[0009] An adsorption structure is disposed between the top cover and the patch; the overlapping structure is connected to the patch through the adsorption structure;

[0010] The first direction, the second direction, and the height direction of the shell are all perpendicular to each other.

[0011] As can be seen from the above, the battery provided in this application, by adding an adsorption structure between the top cover and the patch, and making the patch and the overlapping structure connected through the adsorption structure, can improve the connection strength between the patch and the overlapping structure, reduce the stress effect of the overlapping structure on the patch, so that the patch and the overlapping structure are not easy to separate, and prevent warping problems at the top corner of the patch, which is conducive to ensuring the overall quality of the battery. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a schematic diagram of the battery in an embodiment of this application;

[0014] Figure 2 This is a partial cross-sectional view of the first type of battery in the embodiments of this application;

[0015] Figure 3 This is a partial cross-sectional view of the second type of battery in the embodiments of this application;

[0016] Figure 4 This is a schematic diagram of the first state of the insulating film in an embodiment of this application;

[0017] Figure 5 This is a schematic diagram of the second state of the insulating film in an embodiment of this application;

[0018] Figure 6 This is a schematic diagram of the third state of the insulating film in an embodiment of this application;

[0019] Figure 7 This is a schematic diagram of the first groove portion in the overlapping structure in an embodiment of this application;

[0020] Figure 8 This is a schematic diagram of the first magnetic attraction part within the first groove in an embodiment of this application;

[0021] Figure 9 This is a schematic diagram of the first magnetic attraction part in the overlapping structure in the embodiments of this application;

[0022] Figure 10 This is a schematic diagram of the through-hole in the overlapping structure in an embodiment of this application;

[0023] Figure 11 This is a schematic diagram of the third magnetic attraction part inside the through hole in an embodiment of this application;

[0024] Figure 12 This is a schematic diagram showing the connection between the first magnetic attraction part and the second magnetic attraction part in an embodiment of this application.

[0025] Explanation of reference numerals in the attached figures:

[0026] 100. Shell; 110. Opening;

[0027] 200. Top cover; 210. Second recessed portion;

[0028] 300, Patch panel;

[0029] 400, Insulating film; 410, First insulating portion; 411, First folded edge portion; 420, Second insulating portion; 421, Second folded edge portion; 431, Overlapping structure; 432, First groove portion; 433, Through hole;

[0030] 500, Adsorption structure; 501, Magnet; 502, Coating layer; 510, First magnetic attraction part; 520, Second magnetic attraction part; 530, Corrosion-resistant layer; 540, Third magnetic attraction part; 550, Fourth magnetic attraction part. Detailed Implementation

[0031] 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.

[0032] 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 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 covers the element or object listed following the word and its 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.

[0033] Lithium-ion batteries are high-performance energy storage devices. To ensure the insulation performance and corrosion resistance of lithium-ion batteries, insulating films are typically used as insulating protective materials. During the manufacturing process, the insulating film needs to be wrapped around the outer surface of the battery casing and the edge area of ​​the top cover to cover the gap between the casing and the top cover. Therefore, when wrapping the insulating film around the casing surface, the insulating film needs to extend beyond the top cover in the height direction. The portion extending beyond the top cover is bent towards the center area of ​​the top cover and connected to it, forming a folded edge with a certain width (e.g., 0.5-1 cm) on the top cover. Simultaneously, a protective patch is also attached to the top cover. For batteries with a prismatic structure, the folded edge in the width direction and the folded edge in the length direction of the top cover will overlap at the four corners of the top cover. Especially when the insulating film is a one-piece structure, there will be three layers of insulating film overlapping at the four corners. Because the top cover has three layers of insulating film at its four corners, a single layer of insulating film at the edges (excluding corners), and no insulating film in other areas, and because the surface of the top cover is uneven, the apex of the patch is prone to warping at the four corners after it is applied. This affects the overall quality of the battery and subsequent assembly processes.

[0034] Specifically, if the corner of the battery patch warps, it may lead to the following adverse consequences. For example, in the automated production process of batteries, a warped patch at the corner is easily misidentified as a foreign object by the robotic arm, triggering a machine shutdown alarm and affecting production cycle and overall efficiency. Furthermore, during battery assembly or actual use, the warped corner may scrape against external structures or other battery components, causing insulation damage and potentially leading to a short circuit, posing a potential safety risk. In addition, the warped area may also create tiny gaps between the patch and the insulating film, allowing electrolyte vapor to seep through and corrode the edge of the top cover, affecting the battery's lifespan.

[0035] This application provides a battery, combined with Figures 1-12 The content shown provides a detailed description of the battery.

[0036] A battery includes a housing 100, a top cover 200, a patch 300, an insulating film 400, and an adsorption structure 500. The housing 100 has an opening 110. The top cover 200 closes to the opening 110 and is connected to the housing 100. The patch 300 covers the top of the top cover 200 and is connected to the top cover 200. The insulating film 400 covers the outer surface of the housing 100 and includes two first insulating portions 410 disposed opposite each other in a first direction and two second insulating portions 420 disposed opposite each other in a second direction. Along the height direction of the housing 100, the portion of the first insulating portion 410 extending beyond the top cover 200 faces the top. The central region of the cover 200 is bent to form a first folded edge 411 and is connected to the top cover 200. The portion of the second insulating part 420 extending beyond the top cover 200 is bent toward the central region of the top cover 200 to form a second folded edge 421 and is connected to the top cover 200. The first folded edge 411 and the second folded edge 421 overlap between the top cover 200 and the patch 300 to form an overlapping structure 431. An adsorption structure 500 is disposed between the top cover 200 and the patch 300. The overlapping structure 431 is connected to the patch 300 through the adsorption structure 500. The first direction, the second direction, and the height direction of the housing 100 are perpendicular to each other.

[0037] Figure 1 The content shown is a schematic diagram of a battery provided in this application. Figure 2 and Figure 3 The content displayed is a partial cross-sectional view of different batteries; combined with Figure 1 The structure and orientation shown in the diagram are explained. Specifically, the first orientation can be defined as the X orientation, the second orientation as the Y orientation, and the height orientation of the casing 100 as the Z orientation. When the first orientation (X orientation), the second orientation (Y orientation), and the height orientation of the casing 100 (Z orientation) are perpendicular to each other, they can form an orthogonal coordinate system in three-dimensional space, which facilitates a detailed description of the battery structure.

[0038] Specifically, such as Figure 2 and Figure 3 As shown, the battery provided in this application may include a housing 100 and a top cover 200. Along the height direction of the housing 100, the housing 100 has an opening 110 at its top. The top cover 200 may be designed to fit the shape of the opening 110. In this way, when the top cover 200 covers the opening 110 of the housing 100 and is connected to the housing 100, the opening 110 can be sealed, so that the housing 100 and the top cover 200 enclose a cavity structure. In this way, the interior of the housing 100 can provide sufficient space to accommodate the electrode assembly and electrolyte, ensuring the normal operation of the battery.

[0039] For example, the top cover 200 and the housing 100 can be connected by welding.

[0040] For example, the top cover 200 is also provided with a positive terminal sub-assembly, a negative terminal sub-assembly, and an explosion-proof assembly that are electrically connected to the electrode assembly.

[0041] Furthermore, the battery provided in this application includes a patch 300 and an insulating film 400; such as Figure 1 As shown, the patch 300 covers the top of the top cover 200 and can be fixedly connected to the upper surface of the top cover 200 by an adhesive backing layer or adhesive, thereby protecting the top cover 200; in addition, the orthographic projection of the patch 300 along the height direction of the housing 100 coincides with the orthographic projection of the top cover 200, realizing battery encapsulation and protection.

[0042] For example, patch 300 may be formed of materials such as PC (Polycarbonate) and have a sheet-like structure; in addition, the side of patch 300 near top cover 200 is fixedly connected to the upper surface of top cover 200 by adhesive or bonding agent to make a firm connection between the two.

[0043] Furthermore, in the battery provided in this application, the insulating film 400 covers the outer surface of the casing 100, such as... Figure 1 As shown, the insulating film 400 includes two first insulating portions 410 and two second insulating portions 420; Figure 1 Taking the battery shown as an example, two first insulating portions 410 can be arranged opposite each other along a first direction, and two second insulating portions 420 can be arranged opposite each other along a second direction, so that the insulating film 400 wrapped around the outer surface of the housing 100 forms a housing 100 structure adapted to the housing 100. Thus, the insulating film 400 can effectively protect and electrically insulate the outer surface of the housing 100, improving the safety and reliability of the battery. In this embodiment, the insulating film 400 is an integral structure. In other embodiments, the insulating film can also be a separate structure; for example, it includes a first portion surrounding the sidewall of the housing and a second portion covering the bottom of the housing.

[0044] For example, the insulating film 400 has an adhesive layer on the side near the housing 100, through which the insulating film 400 can be bonded to the outer surface of the housing 100 and the edge area of ​​the top cover 200; to ensure the bonding effect of the insulating part, the adhesive layer can be formed of at least one of polyethylene PE, polypropylene PP, ethylene vinyl acetate copolymer EVA, polyamide PA, polylactic acid PLA, etc. The specific material selection can be determined according to actual needs, and will not be elaborated here.

[0045] Figures 4-6The schematic diagrams showing the positional relationship between the insulating film 400 and the top cover 200 in different states in the embodiments of this application are presented in turn to characterize the process of wrapping the edge area of ​​the top cover 200 with the insulating film 400. For the insulating film 400, along the height direction of the housing 100, both the first insulating portion 410 and the second insulating portion 420 of the insulating film 400 are higher than the height of the assembled housing 100 and the top cover 200. Therefore, when the insulating film 400 is used to cover the edge of the top cover 200, the portion of the first insulating portion 410 that extends beyond the top cover 200 can be bent toward the center area of ​​the top cover 200 to form a first folded edge portion 411 and connect it to the top cover 200 to cover the gap between the housing 100 and the top cover 200 extending in the second direction. Similarly, the portion of the second insulating portion 420 that extends beyond the top cover 200 is also bent toward the center area of ​​the top cover 200 to form a second folded edge portion 421 and connect it to the top cover 200, which can cover the gap between the housing 100 and the top cover 200 extending in the first direction. In this way, the insulation performance of the battery can be guaranteed by the combined action of the first folded edge portion 411 and the second folded edge portion 421.

[0046] like Figure 1 and Figure 6 As shown, after the first folded edge portion 411 and the second folded edge portion 421 are connected to the edge area of ​​the top cover 200, they both cover the top of the top cover 200 and are further shielded and pressed by the patch 300. Specifically, the first folded edge 411 and the second folded edge 421 can form an overlapping structure 431 between the top cover 200 and the patch 300. Therefore, in this overlapping structure 431, there is an overlapping area between adjacent folded edges and they are stacked and connected by adhesive. Due to the stacking, the thickness of the overlapping structure 431 is greater than the thickness of any single folded edge. Due to the properties of the insulating film 400 itself, the overlapping structure 431 will generate outward stress. Thus, when the patch 300 is installed above the first folded edge 411 and the second folded edge 421, the stress generated by the overlapping structure 431 will exert a pushing force on the patch 300. Since the size of the overlapping structure 431 is small, the pushing force generated by the overlapping structure 431 formed by the first folded edge 411 and the second folded edge 421 on the patch 300 is relatively concentrated, thereby increasing the risk of warping of the corresponding apex corner of the patch 300, which may lead to a decrease in the insulation and structural stability of the battery.

[0047] To address the issue of warping at the apex of the patch 300, the battery provided in this application further includes an adsorption structure 500 to enhance the connection strength between the overlapping structure 431 and the patch 300; such as Figures 1-3As shown, the adsorption structure 500 can be disposed between the top cover 200 and the patch 300, and can be connected to the patch 300 and the overlapping structure 431 respectively. In this way, by setting the adsorption structure 500 between the top cover 200 and the patch 300, the connection between the patch 300 and the overlapping structure 431 can be strengthened. Thus, even if the overlapping structure 431 exerts a pushing force on the top corner of the patch 300 due to the thickness accumulation, the patch 300 and the overlapping structure 431 are not easy to separate, thereby effectively avoiding the warping problem at the top corner of the patch 300.

[0048] Furthermore, with Figure 1 Taking the battery shown as an example, the two first insulating parts 410 and the two second insulating parts 420 can form four overlapping structures 431 in the edge area of ​​the top cover 200. Therefore, the battery can be provided with four adsorption structures 500, each adsorption structure 500 corresponding to one overlapping structure 431, and arranged in a rectangular distribution relative to the patch 300 to ensure a uniform and stable fixing effect on the patch 300 as a whole.

[0049] In some embodiments, the adsorption structure 500 includes a first magnetic adsorption portion 510 connected to the overlapping structure 431, and a second magnetic adsorption portion 520 connected to the side of the patch 300 near the top cover 200, wherein the first magnetic adsorption portion 510 and the second magnetic adsorption portion 520 are adsorbed together.

[0050] The adsorption structure 500 located between the top cover 200 and the patch 300 enhances the connection strength between the patch 300 and the overlapping structure 431, preventing the patch 300's apex from warping due to stress generated by the overlapping structure 431. Specifically, as... Figures 1-3 As shown, the adsorption structure 500 may include a first magnetic part 510 and a second magnetic part 520. The first magnetic part 510 is connected to the overlapping structure 431, and the second magnetic part 520 is connected to the side of the patch 300 near the top cover 200. When the patch 300 is covered on the upper surface of the top cover 200, the first magnetic part 510 and the second magnetic part 520 can be magnetically connected, so that the first magnetic part 510 on the overlapping structure 431 can be firmly bonded to the corresponding second magnetic part 520 on the patch 300, thus preventing the patch 300 from separating from the overlapping structure 431 and causing the top corner of the patch 300 to warp.

[0051] Furthermore, due to the adsorption connection between the first magnetic attraction part 510 and the second magnetic attraction part 520, and with the first magnetic attraction part 510 disposed on the upper surface of the overlapping structure 431, the adsorption structure 500 can act as a barrier between the overlapping structure 431 and the patch 300. This arrangement can prevent the stress generated by the overlapping structure 431 from acting directly on the patch 300. Therefore, when the overlapping structure 431 and the patch 300 are connected through the adsorption structure 500, the overlapping structure 431 is less likely to cause warping at the top corner of the patch 300.

[0052] For example, the first magnetic part 510 and the overlapping structure 431, as well as the second magnetic part 520 and the patch 300, can be firmly connected by adhesive; at the same time, the folded edges constituting the overlapping structure 431 can also be connected to each other by adhesive, thereby enhancing the stability and reliability of the structure.

[0053] In some embodiments, the overlapping structure 431 has a first groove 432 on the side away from the top cover 200, and the first magnetic part 510 is embedded in the first groove 432.

[0054] The adsorption structure 500 used to connect the overlapping structure 431 and the patch 300 includes a first magnetic part 510 and a second magnetic part 520. Therefore, the adsorption structure 500 has a certain height in the height direction of the housing 100. Thus, when the adsorption structure 500 is placed between the overlapping structure 431 and the patch 300, the adsorption structure 500 may cause a small gap to be formed between the edge of the patch 300 and the overlapping structure 431. If the overlapping structure 431 and the patch 300 are connected by an adhesive, it may affect the sealing effect and aesthetics of the patch 300 to the top cover 200.

[0055] Figure 7 The content shown is a schematic diagram of the first groove portion 432 in the overlapping structure 431. Figure 8 The content shown is a schematic diagram of the first magnetic attraction part 510 within the first groove part 432; as shown Figure 7 and Figure 8 As shown, a first groove 432 is provided on the side of the overlapping structure 431 away from the top cover 200. The first magnetic part 510 is embedded in the first groove 432. The presence of the first groove 432 allows the first magnetic part 510 to be set lower relative to the surface of the overlapping structure 431, reducing its overall height on the overlapping structure 431. When the first magnetic part 510 and the second magnetic part 520 are attracted and connected, the gap between the overlapping structure 431 and the patch 300 can be reduced, avoiding the presence of the adsorption structure 500 and the formation of a large gap. This allows the patch 300 to be connected to the overlapping structure 431 with an adhesive, avoiding problems such as poor battery encapsulation and quality degradation.

[0056] For example, the contour of the first recess 432 can be formed according to the peripheral contour of the first magnetic portion 510. For example, as Figure 7 and Figure 8 As shown, if the periphery of the first magnetic suction part 510 is rectangular, then the outline of the first groove part 432 opened on the overlapping structure 431 is also a matching rectangle, which is beneficial to the accurate positioning and stable installation of the first magnetic suction part 510.

[0057] In some embodiments, at least one of the first magnetic attraction portion 510 and the second magnetic attraction portion 520 is a magnet 501; specifically, as Figure 1 , Figure 7 as well as Figure 8 As shown, at least one of the first magnetic attraction part 510 and the second magnetic attraction part 520 can be made of magnet 501 material, which has the advantages of simple assembly process and low manufacturing cost, and helps to control the overall manufacturing cost of battery.

[0058] For example, the magnet 501 may be a sheet magnet 501, such as at least one of neodymium iron boron magnet 501, ferrite magnet 501 and AlNiCo magnet 501.

[0059] In a most alternative embodiment, at least one of the first magnetic attraction portion 510 and the second magnetic attraction portion 520 is a magnetically coated layer 502. Wherein, Figure 9 The content shown is a schematic diagram of the first magnetic attraction part 510 in the overlapping structure 431, as follows. Figure 9 As shown, at least one of the first magnetic attraction part 510 and the second magnetic attraction part 520 is a magnetic spray coating 502 with magnetic properties. The magnetic spray coating 502 can be formed directly on the upper surface of the overlapping structure 431 and / or the lower surface of the patch 300 by a spraying process. The magnetic layer formed by the spraying process has a smooth surface and can flexibly adjust the adsorption area of ​​the magnetic attraction part on the upper surface of the overlapping structure 431 and / or the lower surface of the patch 300, which helps to improve the adsorption effect between the first magnetic attraction part 510 and the second magnetic attraction part 520, thereby ensuring the firmness of the connection between the patch 300 and the overlapping structure 431.

[0060] In some embodiments, the outer surface of the first magnetic attraction portion 510 and the outer surface of the second magnetic attraction portion 520 are both provided with a corrosion-resistant layer 530.

[0061] Electrolyte vapor within the housing 100 cavity may leak out through the gap between the housing 100 and the top cover 200. Therefore, the adsorption structure 500 in the battery is at risk of corrosion by the electrolyte vapor, which could affect the connection between the patch 300 and the overlapping structure 431. To ensure the connection stability of the adsorption structure 500, such as... Figure 2 and Figure 3As shown, corrosion-resistant layers 530 can be provided on the outer surface of the first magnetic attraction part 510 and the outer surface of the second magnetic attraction part 520 respectively to enhance their corrosion resistance, thereby ensuring the reliability and durability of the connection between the patch 300 and the adsorption structure 500.

[0062] Furthermore, the thickness of the corrosion-resistant layer 530 is less than the thickness of the first magnetic attraction portion 510 and less than the thickness of the second magnetic attraction portion 520.

[0063] Specifically, such as Figure 2 and Figure 3 As shown, the thickness of the corrosion-resistant layer 530 is smaller than the thickness of the first magnetic attraction part 510 and the second magnetic attraction part 520, respectively. On the one hand, this helps to control the overall height of the adsorption structure 500 and avoid increasing the gap between the patch 300 and the overlapping structure 431 due to the excessive thickness of the corrosion-resistant layer; on the other hand, it helps to reduce the influence of the corrosion-resistant layer on the adsorption between the first magnetic attraction part 510 and the second magnetic attraction part 520, so that the two maintain a reliable connection relationship.

[0064] For example, the corrosion-resistant layer 530 can be formed by an electroplating process, such as using materials with corrosion-resistant properties, such as nickel plating or zinc plating, to effectively improve the environmental adaptability and service life of the adsorption structure 500.

[0065] In some embodiments, the orthographic projection of the adsorption structure 500 in the height direction of the housing 100 is located within the patch 300; such as Figure 1 As shown, when the patch 300 is connected to the top cover 200, if the orthogonal projection of the adsorption structure 500 in the height direction of the housing 100 is within the range of the patch 300, the patch 300 can effectively shield and protect the adsorption structure 500, thereby improving the overall appearance of the battery and ensuring the stability of the adsorption structure 500 and its fixing effect on the patch 300.

[0066] In some embodiments, the thickness of the first magnetic attraction part 510 is H1, 1mm≤H1≤2mm, and the thickness of the second magnetic attraction part 520 is H2, 1mm≤H2≤2mm.

[0067] Figure 12 The content shown is a schematic diagram of the connection between the first magnetic attraction part 510 and the second magnetic attraction part 520; as shown Figure 12As shown, the thickness of the first magnetic attraction part 510 can be defined as H1. By controlling its thickness within the range of 1-2 mm, good adsorption performance can be ensured, while avoiding excessive spacing between the patch 300 and the overlapping structure 431 due to excessive thickness. Similarly, defining the thickness of the second magnetic attraction part 520 as H2 and controlling it within the range of 1-2 mm can also ensure its adsorption performance, while preventing excessive spacing between the patch 300 and the overlapping structure 431 due to increased thickness. Therefore, by reasonably controlling the thickness of the first magnetic attraction part 510 and the second magnetic attraction part 520, the connection strength of the adsorption structure 500 can be ensured while its overall height can be reasonably controlled.

[0068] In some embodiments, the attraction force of the first magnetic attraction part 510 is F1, 0.5kg≤F1≤1kg, and the attraction force of the second magnetic attraction part 520 is F2, 0.5kg≤F2≤1kg.

[0069] Specifically, the attraction force of the first magnetic attraction part 510 can be defined as F1 and controlled within the range of 0.5-1 kg. This ensures that the first magnetic attraction part 510 has good adsorption performance while reducing the performance requirements of the materials used in its selection. Similarly, the attraction force of the second magnetic attraction part 520 can be defined as F2 and also controlled within the range of 0.5-1 kg to ensure that the second magnetic attraction part 520 also has a stable adsorption effect while reducing dependence on its material properties. In this way, by reasonably setting the attraction forces of the first magnetic attraction part 510 and the second magnetic attraction part 520, the connection strength of the adsorption structure 500 can be guaranteed while also helping to effectively control the manufacturing cost of the adsorption structure 500.

[0070] In some embodiments, the overlapping structure 431 has a through hole 433 along the height direction of the housing 100, and the adsorption structure 500 is disposed in the through hole 433.

[0071] The adsorption structure 500 located between the top cover 200 and the patch 300 enhances the connection strength between the patch 300 and the overlapping structure 431, preventing warping at the apex corner of the patch 300 due to stress generated by the overlapping structure 431. Specifically, Figure 10 The displayed content is a schematic diagram of the through-hole 433 in the overlapping structure 431, as shown below. Figure 3 and Figure 10As shown, the overlapping structure 431 has a through hole 433 along the height direction of the housing 100 to accommodate the adsorption structure 500. The adsorption structure 500 is disposed in the through hole 433 and is connected to the upper surface of the top cover 200 and the upper surface of the patch 300 respectively. In this way, the position of the overlapping structure 431 can be effectively limited by the cooperation between the adsorption structure 500 and the through hole 433, which improves the connection between the overlapping structure 431 and the patch 300, and at the same time reduces the stress generated by the overlapping structure 431 on the patch 300, preventing warping problems at the top corner of the patch 300 due to stress concentration.

[0072] Furthermore, the adsorption structure 500 includes a third magnetic part 540 connected to the top cover 200 and a fourth magnetic part 550 connected to the side of the patch 300 near the top cover 200, and the third magnetic part 540 and the fourth magnetic part 550 are adsorbed together.

[0073] Figure 11 The displayed content is a schematic diagram of the third magnetic attraction part 540 within the through hole 433. (See diagram below.) Figure 3 and Figure 11 As shown, the adsorption structure 500 includes a third magnetic part 540 and a fourth magnetic part 550. The third magnetic part 540 is connected to the top cover 200, and the fourth magnetic part 550 is connected to the side of the patch 300 near the top cover 200. When the patch 300 covers the upper surface of the top cover 200, the third magnetic part 540 and the fourth magnetic part 550 can be magnetically attracted to each other, forming a columnar structure penetrating the through hole 433. This allows the adsorption structure 500 to firmly connect the patch 300 to the top cover 200 and to position and fix the top corner of the patch 300. This design helps to improve the stability of the patch 300 connection, reduce the stress generated by the overlapping structure 431 on the patch 300, and prevent warping at the top corner of the patch 300 due to separation between the overlapping structure 431 and the patch 300.

[0074] For example, the third magnetic part 540 and the top cover 200, as well as the fourth magnetic part 550 and the patch 300, can be firmly connected by adhesive, thereby improving the stability and reliability of the magnetic parts in their respective installation positions.

[0075] In some embodiments, a second groove 210 is provided on the top of the top cover 200, and a third magnetic part 540 is embedded in the second groove 210.

[0076] like Figure 10 and Figure 11As shown, the top cover 200 has a second groove 210, and the third magnetic part 540 is embedded in the second groove 210. When the third magnetic part 540 and the fourth magnetic part 550 are connected by adsorption, the second groove 210 on the top cover 200 is recessed relative to the surface of the top cover 200, which can reduce the installation height of the adsorption structure 500 on the top cover 200. When the columnar structure formed after the third magnetic part 540 and the fourth magnetic part 550 are connected by adsorption penetrates the through hole 433, this setting helps to control the spacing between the patch 300 and the overlapping structure 431, avoids the presence of the adsorption structure 500 causing a large gap between them, and facilitates the patch 300 to achieve auxiliary connection with the overlapping structure 431 through adhesive, avoiding poor battery encapsulation.

[0077] For example, the contour of the second groove 210 can be adapted to the peripheral contour of the third magnetic part 540. For instance, when the third magnetic part 540 is cylindrical, it can reduce the stress on the wall of the through hole 433. In this case, the second groove 210 opened on the top cover 200 can be set to a matching circular contour, which helps to achieve accurate positioning and stable installation of the third magnetic part 540 on the top cover 200.

[0078] In some embodiments, at least a portion of the orthographic projection of the adsorption structure 500 in the height direction of the housing 100 lies within the overlapping structure 431. For example... Figure 2 and Figure 3 As shown, in the height direction of the housing 100, by placing at least a portion of the orthographic projection of the adsorption structure 500 within the orthographic projection of the overlapping structure 431, the overlapping structure 431 can establish a connection with the patch 300 through the adsorption structure 500; at the same time, the adsorption structure 500 can also limit the overlapping structure 431, reduce the force exerted by the overlapping structure 431 on the patch 300, and reduce the risk of the patch 300 warping due to stress concentration.

[0079] For example, the surface of the adsorption structure 500 can be connected to the lower surface of the patch, and a portion of the lower surface of the adsorption structure 500 can be connected to the overlapping structure 431, while a portion can be connected to the upper surface of the top cover 200.

[0080] It should be noted that some embodiments of this application have been described above. Other embodiments are within the scope of the appended claims.

[0081] 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.

[0082] 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.

[0083] 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 (including the claims) is limited to these examples; within the framework 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 the details for the sake of brevity.

[0084] 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.

[0085] The embodiments of this application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. 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, characterized in that, include: The shell has an opening; A top cover that closes to the opening and is connected to the housing; A patch is applied to the top of the top cover and connected to the top cover; An insulating film, covering the outer surface of the housing, includes two first insulating portions disposed opposite each other in a first direction, and two second insulating portions disposed opposite each other in a second direction; along the height direction of the housing, the portion of the first insulating portion extending beyond the top cover is bent toward the central region of the top cover to form a first folded edge portion and connected to the top cover, the portion of the second insulating portion extending beyond the top cover is bent toward the central region of the top cover to form a second folded edge portion and connected to the top cover, the first folded edge portion and the second folded edge portion overlap between the top cover and the patch to form an overlapping structure; An adsorption structure is disposed between the top cover and the patch; the overlapping structure is connected to the patch through the adsorption structure; The first direction, the second direction, and the height direction of the shell are all perpendicular to each other.

2. The battery according to claim 1, characterized in that, The adsorption structure includes a first magnetic adsorption part connected to the overlapping structure, and a second magnetic adsorption part connected to the side of the patch near the top cover, wherein the first magnetic adsorption part and the second magnetic adsorption part are adsorbed together.

3. The battery according to claim 2, characterized in that, The overlapping structure has a first groove on the side away from the top cover, and the first magnetic part is embedded in the first groove.

4. The battery according to claim 2, characterized in that, At least one of the first magnetic attraction part and the second magnetic attraction part is a magnet, or At least one of the first magnetic attraction part and the second magnetic attraction part is a magnetic spray coating.

5. The battery according to claim 2, characterized in that, Both the outer surfaces of the first magnetic attraction part and the outer surfaces of the second magnetic attraction part are provided with a corrosion-resistant layer. The thickness of the corrosion-resistant layer is less than the thickness of the first magnetic attraction part and less than the thickness of the second magnetic attraction part.

6. The battery according to claim 1, characterized in that, The orthographic projection of the adsorption structure in the height direction of the shell is located within the patch.

7. The battery according to claim 2, characterized in that, The thickness of the first magnetic attraction part is H1, 1mm ≤ H1 ≤ 2mm; the thickness of the second magnetic attraction part is H2, 1mm ≤ H2 ≤ 2mm; and / or The attraction force of the first magnetic attraction part is F1, 0.5kg≤F1≤1kg, and the attraction force of the second magnetic attraction part is F2, 0.5kg≤F2≤1kg.

8. The battery according to claim 1, characterized in that, The overlapping structure has a through hole along the height direction of the shell, and the adsorption structure is disposed in the through hole; The adsorption structure includes a third magnetic adsorption part connected to the top cover and a fourth magnetic adsorption part connected to the side of the patch near the top cover, wherein the third magnetic adsorption part and the fourth magnetic adsorption part are adsorbed together.

9. The battery according to claim 8, characterized in that, The top of the top cover has a second groove, and the third magnetic part is embedded in the second groove.

10. The battery according to claim 1, characterized in that, The adsorption structure has at least a partial orthogonal projection in the height direction of the shell located within the overlapping structure.

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