Housing, electrochemical device, and electronic apparatus

Abstract

The invention discloses a shell, an electrochemical device and electronic equipment. The shell comprises a containing part and a sealing part, a containing cavity is defined by the containing part, and the sealing part is connected to the outer surface of the containing part. The shell comprises a first adhesive layer, a first notch is formed in the edge of the sealing part, and the first notch is provided with a first edge and a second edge. The first adhesive layer is arranged on the sealing part, and in the thickness direction of the shell, the projection of the first adhesive layer covers at least part of the first notch and is connected with the first edge and the second edge. When the second extension wall is impacted, part of the impact force is transmitted to the first adhesive layer and is removed through the first adhesive layer. In this way, the impact force borne by the second extension wall is reduced accordingly, and then the risk that the second extension wall is torn can be reduced. Therefore, the shell provided by the embodiment of the invention can improve the risk that the sealing part of the current shell is easy to tear at the notch.

Description

Housing, electrochemical device and electronic equipment Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a housing, an electrochemical device, and an electronic device. Background Art

[0002] Currently, electrochemical devices are widely used in electronic devices such as mobile phones, tablets, and laptops to power these products. An electrochemical device consists of a housing, an electrode assembly, tabs, and an electrolyte. The electrode assembly includes a first electrode plate and a second electrode plate of opposite polarity, and a separator disposed between the first and second electrode plates. The tabs are connected to the electrode assembly and partially extend beyond the housing to form the conductive terminals of the electrochemical device.

[0003] The housing of some electrochemical devices is made of a flexible material and includes a housing portion and a sealing portion extending from the sidewalls of the housing portion. The housing portion defines a cavity for accommodating the electrode assembly and electrolyte; the sealing portion is where the housing is sealed, using processes such as heat sealing. The tabs of the electrochemical device also extend from the housing through this sealing portion. To reduce the space occupied by the electrochemical device, the sealing portion is typically folded close to or flush against the sidewalls of the housing portion.

[0004] For a housing with a square, L-shaped or U-shaped accommodating portion, a notch is generally provided on the outer edge of the sealing portion at the corner corresponding to the side wall of the accommodating portion, so that the portions of the sealing portion on both sides of the corner can be folded over.

[0005] Summary of the Invention

[0006] The inventors of the present application discovered during the process of implementing the present application that electrochemical devices are often exposed to falling scenarios, and the provision of the above-mentioned notch makes it easy for the shell sealing portion to tear at the notch, which may further cause leakage of the electrochemical device.

[0007] In view of the above-mentioned problems existing in the prior art, the present application aims to provide a housing, an electrochemical device and an electronic device to improve the current situation in which the sealing portion at the notch is prone to tearing.

[0008] In a first aspect, the present application provides a housing comprising a housing portion and a sealing portion, wherein the housing portion defines a housing cavity, and the sealing portion is connected to an outer surface of the housing portion. The housing comprises a first adhesive layer, and an edge of the sealing portion is provided with a first notch, wherein the first notch has a first edge and a second edge. The first adhesive layer is disposed on the sealing portion, and along the thickness direction of the housing, the projection of the first adhesive layer covers at least a portion of the first notch and connects the first edge and the second edge. In some embodiments, the first notch is formed by enclosing the first edge and the second edge.

[0009] When the second extension wall is impacted, part of the impact force is transferred to the first adhesive layer and removed via the first adhesive layer. This reduces the impact force on the second extension wall, thereby reducing the risk of tearing. In other words, the housing provided by the embodiments of the present application can mitigate the risk of tearing at the notch in the sealing portion of current housings. In some embodiments, when viewed along the first direction, the first notch extends through the sealing portion. This approach also mitigates the risk of further inward tearing at the notch, preventing leakage.

[0010] In some embodiments, the accommodating portion includes a first wall, a second wall, and a connecting wall, wherein the first wall and the second wall are arranged opposite each other along a first direction, the connecting wall connects the first wall and the second wall, and the first wall, the second wall, and the connecting wall together enclose the accommodating cavity, and the sealing portion is connected to the connecting wall. The first direction is the thickness direction of the housing.

[0011] In some embodiments, the connecting wall includes a first wall unit, a second wall unit, and a third wall unit sequentially connected along the edge contour of the first wall. When viewed along the thickness direction, the extension directions of the first wall unit and the third wall unit intersect. The outer surface of the second wall unit is concave toward the accommodating cavity. The first wall unit, the second wall unit, and the third wall unit together form a concave corner structure. The sealing portion includes a first extension wall, a second extension wall, and a third extension wall. The first extension wall includes a first region extending outward from the surface of the first wall unit. The second extension wall extends outward from the surface of the second wall unit. The edge of the second extension wall is provided with the first notch. The third extension wall includes a third region extending outward from the surface of the third wall unit. Along the first direction, one end of the first extension wall and the third extension wall are respectively connected to the connecting wall, and the other ends of the first extension wall and the third extension wall extend toward the second wall.

[0012] In some embodiments, an edge of the second extension wall facing away from the second wall unit has a first edge connected to the first region, the first extension wall further includes a second region connected to the first region, the second region extending from the first edge toward the second wall. An edge of the second extension wall facing away from the second wall unit has a second edge connected to the third region, the third extension wall further includes a fourth region connected to the third region, the fourth region extending from the second edge toward the second wall.

[0013] In some embodiments, the first adhesive layer is bonded to the second region. The first region is attached to and fixed to the first wall unit. During transportation, assembly, and use of the electrochemical device, the first region does not move relative to the housing portion. The second region, however, is not fixed to the first wall unit and may move relative to the first wall unit, thereby affecting the fixing strength between the first region and the first wall unit. The bonding of the first adhesive layer to the second region can constrain the second region, significantly reducing its relative movement relative to the first region, or even preventing relative movement. This ensures that the first extension wall remains vertically positioned for a long period of time, preventing the electrochemical device from occupying a large space.

[0014] In some embodiments, the first adhesive layer is bonded to the fourth region. The third region is attached to and fixed to the third wall unit. During transportation, assembly, and use of the electrochemical device, the third region does not move relative to the housing portion. The fourth region, however, is not fixed to the third unit and may move relative to the third wall unit, thereby affecting the fixing strength between the third region and the third wall unit. The bonding of the first adhesive layer to the fourth region can constrain the fourth region, significantly reducing its relative movement relative to the third region, or even preventing relative movement. This ensures that the third extension wall remains vertically positioned for a long period of time, preventing the electrochemical device from occupying a large space.

[0015] In some embodiments, the first adhesive layer is bonded to the second wall unit. Since the second wall unit is made of a flexible material, the connection between the second wall unit and the first adhesive layer allows the first adhesive layer to absorb more of the impact force through the second wall unit when subjected to an impact, thereby reducing the risk of the first adhesive layer and the second extension wall being torn.

[0016] In some embodiments, the first gap is filled with the first glue layer.

[0017] In some embodiments, when viewed along the first direction, the first adhesive layer is circular, elliptical, or fan-shaped.

[0018] In some embodiments, the connecting wall includes a third wall unit, a fourth wall unit, and a fifth wall unit sequentially connected along the edge contour of the first wall. When viewed along the first direction, the extension directions of the third wall unit and the fifth wall unit intersect, and the outer surface of the fourth wall unit is concave toward the accommodating cavity. The third wall unit, the fourth wall unit, and the fifth wall unit together form a concave corner structure. The sealing portion also includes a fourth extension wall and a fifth extension wall. The fourth extension wall extends outward from the surface of the fourth wall unit, and the edge of the fourth extension wall is provided with a second notch. The fifth extension wall includes a sixth region, and the sixth region extends outward from the surface of the fifth wall unit. Along the first direction, one end of the fifth extension wall is connected to the connecting wall, and the other end of the fifth extension wall extends toward the second wall. The electrochemical device also includes a second adhesive layer, which is provided on the sealing portion and covers at least a portion of the second notch.

[0019] In some embodiments, an edge of the fourth extension wall facing away from the fourth wall unit has a third edge connected to the third region, and the third extension wall further includes a fifth region extending from the third edge toward the second wall. An edge of the fourth extension wall facing away from the fourth wall unit has a fourth edge connected to the sixth region, and the fifth extension wall further includes a seventh region extending from the fourth edge toward the second wall.

[0020] In some embodiments, when viewed along the first direction, the receiving portion is L-shaped or U-shaped.

[0021] In some embodiments, the tensile strength of the first adhesive layer is σ1, and the tensile strength of the second extension wall is σ2, where 2 ≤ σ1 / σ2 ≤ 10. This configuration ensures that the tensile strength of the first adhesive layer is significantly higher than that of the second extension wall, thereby ensuring long-term and high-frequency impact relief for the second extension wall. Preferably, 3 ≤ σ1 / σ2 ≤ 4.

[0022] In some embodiments, the peeling force between the first adhesive layer and the second extension wall is F1. The sealing portion includes a metal material layer and an insulating material layer disposed on the surface of the metal material layer. The first adhesive layer is disposed on the surface of the insulating material layer. The peeling force between the metal material layer and the insulating material layer is F2, and 1.2≤F1 / F2≤10. This configuration ensures that the bonding force between the first adhesive layer and the second extension wall is greater than the bonding force between the metal material layer and the insulating material layer in the sealing portion. Even if slippage occurs between the first adhesive layer and the second extension wall, it occurs after the slippage between the metal material layer and the insulating material layer in the sealing portion. In other words, a greater bonding force is ensured between the first adhesive layer and the second extension wall, thereby reducing the risk of the first adhesive layer separating from the second extension wall during use of the electrochemical device. Preferably, 1.2≤F1 / F2≤2.

[0023] In some embodiments, the hardness of the first adhesive layer is H1, the hardness of the second extension wall is H2, and 1.3≤H1 / H2≤10. Preferably, 2≤H1 / H2≤4.

[0024] In some embodiments, the sealing portion is connected to one end of the connecting wall along the first direction.

[0025] In a second aspect, the present application further provides an electrochemical device, which includes the above-mentioned shell.

[0026] Since the electrochemical device includes the above-mentioned housing, the risk of the sealing portion of the current housing being easily torn at the notch can be improved.

[0027] In a third aspect, the present application further provides an electronic device comprising the electrochemical device. Due to the inclusion of the housing, the electronic device can reduce the risk of the sealing portion of the current housing being easily torn at the notch. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] One or more embodiments are exemplarily illustrated by corresponding drawings, which do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0029] FIG1 is a schematic diagram of an electrochemical device provided in one embodiment of the present application;

[0030] FIG2 is a schematic cross-sectional view of the electrochemical device along line AA in FIG1 ;

[0031] FIG3 is a partial enlarged schematic diagram of point B in FIG1 ;

[0032] FIG4 is a partial enlarged schematic diagram of point C in FIG2 ;

[0033] FIG5 is a schematic diagram of an electrochemical device provided in another embodiment of the present application;

[0034] FIG6 is a schematic diagram of an electronic device provided in accordance with one embodiment of the present application. DETAILED DESCRIPTION

[0035] In order to facilitate the understanding of the present application, the present application is described in more detail below with reference to the accompanying drawings and specific embodiments. It should be noted that when an element is described as being "fixed to" / "fixed to" / "installed on" another element, it can be directly on the other element, or one or more centered elements can exist between them. When an element is described as being "connected to" another element, it can be directly connected to the other element, or one or more centered elements can exist between them. The terms "vertical", "horizontal", "left", "right", "inside", "outside" and similar expressions used in this specification are for illustrative purposes only.

[0036] Unless otherwise defined, all technical and scientific terms used in this specification have the same meanings as those commonly understood by those skilled in the art to which this application belongs. The terms used in this specification are for the purpose of describing specific embodiments only and are not intended to limit this application. The term "and / or" as used in this specification includes any and all combinations of one or more of the relevant listed items.

[0037] In addition, the technical features involved in different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0038] Please refer to Figures 1 to 4 , which respectively illustrate a schematic diagram of an electrochemical device 1 according to one embodiment of the present application, a schematic cross-sectional view of the electrochemical device 1 along line AA, a partially enlarged schematic view of position A, and a partially enlarged schematic view of position B. The electrochemical device 1 comprises a housing 100, an electrode assembly 200, and a tab 300. The housing 100 serves as a mounting base and container for the other components of the electrochemical device 1. The electrode assembly 200, housed within the housing 100, is the core component that enables charging and discharging of the electrochemical device 1. One end of the tab 300 is connected to the electrode assembly 200, while the other end extends out of the housing 100 for connection to an external electrical load. The specific structure of the electrochemical device 1 will be described below, using a lithium-ion battery as an example. It is understood that in other embodiments of the present application, the electrochemical device 1 may also be a sodium-ion battery or other electrochemical device.

[0039] Regarding the housing 100, please refer to Figure 2 for details. The housing 100 is made of a flexible material and constitutes the mounting base, container, and outer protective structure of the electrochemical device 1. The housing 100 includes a housing portion 110 and a sealing portion 120. The housing portion 110 defines a cavity 101 for accommodating the electrode assembly 200, electrolyte, and tab 300. The sealing portion 120 is connected to the outer surface of the housing portion 110 and is a sealed portion formed by laminating and bonding the housing 100 using methods such as hot melt or adhesive.

[0040] The aforementioned accommodating portion 110 includes a first wall 111, a second wall 112, and a connecting wall 113. The first wall 111 and the second wall 112 are substantially identical in shape and are disposed opposite each other along a first direction X as shown. The connecting wall 113 is located between the first wall 111 and the second wall 112, connecting the first wall 111 and the second wall 112, respectively. Together, the first wall 111, the second wall 112, and the connecting wall 113 form the aforementioned accommodating cavity 101. The "first direction" referred to in this application document refers to the thickness direction of the housing 100.

[0041] Please refer specifically to FIG1 . In this embodiment, when viewed along the first direction X, the accommodating portion 110 is L-shaped. Accordingly, the connecting wall 113 includes a first wall unit 1131, a second wall unit 1132, a third wall unit 1133, a fourth wall unit 1134, a fifth wall unit 1135, a sixth wall unit 1136, and a seventh wall unit 1137, which are sequentially arranged along the edge contour of the first wall 111. When viewed along the first direction X, the first wall unit 1131 extends along a second direction Y as shown, which is perpendicular to the first direction X. The third wall unit 1133 extends along a third direction Z as shown, which is perpendicular to both the first and second directions X, Y. The first wall unit 1131 and the third wall unit 1133 extend in directions that intersect, and the second wall unit 1132 connects the first wall unit 1131 and the third wall unit 1133. When viewed along the first direction X, the outer surface of the second wall unit 1132 is concavely disposed toward the accommodating cavity 101, such as the inwardly concave arc shape shown in FIG1 . The first wall unit 1131, the second wall unit 1132, and the third wall unit 1133 collectively form a concave corner structure.

[0042] The fourth wall unit 1134 and the sixth wall unit 1136 also extend along the second direction Y shown in the figure and are disposed on either side of the first wall unit 1131. The fifth wall unit 1135 and the seventh wall unit 1137 extend along the third direction Z shown in the figure and are disposed on either side of the third wall unit 1133. The length of the sixth wall unit 1136 is greater than the lengths of the first wall unit 1131 and the fourth wall unit 1134, while the length of the fifth wall unit 1135 is greater than the lengths of the third wall unit 1133 and the seventh wall unit 1137. Therefore, one of the edges of the sixth wall unit 1136 extending along the second direction Y and the edges of the fifth wall unit 1135 extending along the third direction Z constitutes the long side of the electrochemical device 1, while the other constitutes the wide side of the electrochemical device 1.

[0043] Regarding the aforementioned sealing portion 120, referring to Figures 1 and 3 , the sealing portion 120 is connected to the connecting wall 113 and includes a first extension wall 121, a second extension wall 122, and a third extension wall 123. The first extension wall 121 includes a first region 1211 extending from the surface of the first wall unit 1131, with one end connected to the first wall unit 1131 and the other end extending toward the second wall 112. In other words, the first region 1211 is disposed vertically as shown in Figure 1 . The second extension wall 122 extends from the surface of the second wall unit 1132, with one end connected to the second wall unit 1132 and the other end extending away from the second wall unit 1132. It is disposed substantially parallel to the first and second walls 111 and 112. The third extension wall 123 includes a third area 1231, which is formed by extending outward from the surface of the above-mentioned third wall unit 1133, one end of which is connected to the third wall unit 1133, and the other end of which extends toward the above-mentioned second wall 112; that is, the third area 1231 is arranged in the vertical direction as a whole as shown in Figure 1.

[0044] A first notch 1201 is defined on the edge of the second extension wall 122 facing away from the second wall unit 1132. The first notch 1201 is located between the first extension wall 121 and the third extension wall 123 and has a first edge and a second edge. When viewed along the first direction X, one end of the first extension wall 121 extends to the first notch 1201, and one end of the third extension wall 123 also extends to the first notch 1201. The provision of the first notch 1201 disconnects the first extension wall 121 and the third extension wall 123. During the folding process of the sealing portion 120, the first and third extension walls 121, 123 can be folded over to fit against the connecting wall 113, facilitating adhesion of the first and third extension walls 121, 123 to the connecting wall 113. In some embodiments, the first notch 1201 may extend through the sealing portion 120 when viewed along the first direction X. In some embodiments, the first notch 1201 is formed by the first and second edges of the sealing portion 120.

[0045] In this embodiment, the edge of the second extension wall 122 facing away from the second wall unit 1132 has a first edge 1221 connected to the first region 1211, and the edge of the second extension wall 122 facing away from the second wall unit 1132 has a second edge 1222 connected to the third region 1231. Accordingly, the first extension wall 121 also includes a second region 1212, which extends from the first edge 1221. One end of the second extension wall 1212 is connected to the first edge 1221 of the second extension wall, and the other end extends toward the second wall 112. The second region 1212 and the first region 1211 form an integral structure. Along the first direction X, one end of the first extension wall 121 is connected to the connecting wall 113, and the other end extends toward the second wall 112. The third extension wall 123 also includes a fourth region 1232 extending from the second edge 1222. One end of the fourth region 1232 is connected to the second edge 1222 of the second extension wall, and the other end extends toward the second wall 112. The fourth region 1232 forms an integral structure with the third region 1231. In other words, the first notch 1201 is located between the second region 1212 and the fourth region 1232.

[0046] In addition, in this embodiment, the sealing portion 120 further includes a fourth extension wall 124, a fifth extension wall 125, and a sixth extension wall 126. Specifically, referring to FIG. 1 , the fourth extension wall 124 extends from the surface of the fourth wall unit 1134, with one end connected to the fourth wall unit 1134 and the other end extending toward the second wall 112. The fifth extension wall 125 extends from the surface of the fifth wall unit 1135, with one end connected to the fifth wall unit 1135 and the other end extending toward the second wall 112. The sixth extension wall 126 extends from the surface of the seventh wall unit 1137, with one end connected to the seventh wall unit 1137 and the other end extending away from the seventh wall unit 1137. The sixth extension wall 126 is disposed substantially parallel to the first wall 111 and the second wall 112. The sixth extension wall 126 , the first extension wall 121 , the second extension wall 122 , the third extension wall 123 , the fourth extension wall 124 and the fifth extension wall 125 are sequentially connected to form an integrated structure.

[0047] In this embodiment, the electrochemical device further includes a second adhesive layer; specifically, at least one of the first region 1211 , the third region 1211 , the fourth extension wall 124 , the fifth extension wall 125 and the sixth extension wall 126 is bonded to the accommodating portion 110 via the second adhesive layer.

[0048] To facilitate a better understanding of the housing 100 , a brief description of the manufacturing process of the housing 100 is given below.

[0049] In this embodiment, the electrochemical device 1 is a soft-pack battery, and the housing 100 comprises a base shell and a cover arranged opposite each other. The base shell is a topless box-like structure comprising a cavity portion and a flange portion. The cavity portion comprises an L-shaped concave cavity with one end open. The cavity portion extends outward from the edge of the concave cavity to form the flange portion; that is, the flange portion extends around the open end of the cavity portion. The cover is positioned opposite the concave cavity, with its edge affixed to the flange portion to form a sealing portion 120, thereby sealing the concave cavity. Thus, the portion of the housing 100 outside the sealing portion forms the housing 110 of the housing 100. Preferably, the edges of the base shell and the cover are fixedly connected by hot melt. Of course, in other embodiments of the present application, the base shell and the cover can also be fixed by adhesive bonding or other methods. However, hot melt bonding allows the base shell and the cover to be fixed together without adding additional materials or waiting for the adhesive to dry, resulting in a more efficient connection.

[0050] In this embodiment, the base shell and the cover are integrally formed. Specifically, the housing 100 comprises a multilayer sheet material, which specifically includes an insulating material layer (not shown in the figure), a metal material layer (not shown in the figure), and an insulating material layer (not shown in the figure) stacked in sequence. More specifically, the multilayer sheet material includes a first portion and a second portion arranged adjacent to each other, each of which includes the above-mentioned stacked insulating material layer, metal material layer, and insulating material layer. The middle region of the first portion is recessed until it is completely offset from the edge region of the first portion along the thickness direction of the multilayer sheet material, thereby forming the above-mentioned base shell with a concave cavity. That is, the middle region of the first portion constitutes the cavity portion of the base shell, and the edge region of the first portion constitutes the flange portion of the base shell. Optionally, the middle region of the first portion is formed by stamping. The second portion is connected to the edge of the first portion and is folded toward the side facing the above-mentioned concave cavity to seal the above-mentioned concave cavity, thereby forming the housing 100 with an internal accommodating cavity; the boundary region between the second portion and the first portion is located in the above-mentioned sixth wall unit. The edges of the first part and the second part are correspondingly fitted and fixed to form the above-mentioned sealing portion 120. It is worth mentioning that the choice of multi-layer sheet is actually diverse. For example, in some embodiments, the metal material layer includes aluminum foil, one insulating material layer includes polyethylene terephthalate, and the other insulating material layer includes polyethylene; for another example, in some other embodiments, the metal material layer still includes aluminum foil, and both insulating material layers include polyethylene terephthalate; for another example, in some other embodiments, the metal material layer still includes aluminum foil, and both insulating material layers include a mixture of polyethylene terephthalate and polyethylene; the present application does not make specific limitations on the structure of the multi-layer sheet. Of course, in other embodiments of the present application, the base shell and the cover can also be two independent structures, which are stacked and fixed and sealed by hot melting or bonding; accordingly, the sealing portion will also include a seventh extension wall extending from the above-mentioned sixth wall unit.

[0051] It's worth noting that while the provision of the aforementioned first notch 1201 facilitates the folding of the first extension wall 121 and the third extension wall 123, it also weakens the sealing portion 120 at this location. If the electrochemical device 1 or an electronic device equipped with the electrochemical device 1 is accidentally dropped, the sealing portion 120 is susceptible to further tearing beyond the first notch 1201. When the tear extends to the second wall unit 1132, the housing 100 may be damaged by the tear, potentially leading to electrolyte leakage or the intrusion of moisture and dust into the housing 100, thus causing the electrochemical device 1 to malfunction. To mitigate these risks, the housing 100 further includes a first adhesive layer 130. The first adhesive layer 130 is disposed on the sealing portion 120. Along the thickness direction of the housing 100, the projection of the first adhesive layer 130 covers at least a portion of the aforementioned first notch 1201 and connects the first edge and the second edge. Therefore, when the second extension wall 122 is impacted, part of the impact force will be transferred to the first adhesive layer 130 and removed by the first adhesive layer 130, thereby reducing the impact force on the second extension wall 122, thereby reducing the risk of the second extension wall 122 being torn, and thus reducing the risk of damage to the housing 100.

[0052] In this embodiment, viewed along the first direction X, the first notch 1201 has a first side located near the first extension wall 121 and a second side located near the third extension wall 123, with the first and second sides being disposed opposite each other. The first adhesive layer 130 covers at least a portion of both the first and second sides. Thus, while the first notch 1201 divides the second extension wall 122 into two portions, the first adhesive layer 130 bonds these two portions together, preventing further tearing before the first adhesive layer 130 is torn. Therefore, the provision of the first adhesive layer 130 effectively reduces the risk of tearing of the second extension wall 122. Optionally, the first adhesive layer 130 is provided on the side of the second extension wall 122 facing the second wall 112. Because there is a gap between the side of the second extension wall 122 facing the second wall 112 and the second wall 112, and the outer surface of the second wall unit 1132 is concave toward the accommodating cavity, providing the first adhesive layer 130 on the side of the second extension wall 122 facing the second wall 112 does not increase the required volume of the electrochemical device 1. It should be understood that even though this embodiment uses the side of the second extension wall 122 facing the second wall 112 as an example for description, the present application is not limited to this embodiment. For example, in other embodiments of the present application, the first adhesive layer 130 may also be provided on the side of the second extension wall 122 facing the first wall 111. For another example, in other embodiments of the present application, the first gap 1201 may also be filled with the first adhesive layer 130.

[0053] Furthermore, the first adhesive layer 130 and the second region 1212 are bonded and fixed. The first region 1211 is attached to and fixed to the first wall unit 1131. During transportation, assembly, and use of the electrochemical device 1, the first region 1211 does not move relative to the accommodating portion 110. Unlike the second region 1212, which is not fixed to the first wall unit 1131, it may move relative to the first wall unit 1131, thereby affecting the fixing strength between the first region 1211 and the first wall unit 1131. The bonding of the first adhesive layer 130 and the second region 1212 constrains the second region 1212, significantly reducing its relative movement relative to the first region 1211, or even preventing relative movement. This ensures that the first extension wall 121 is maintained in the vertical position shown in FIG. 1 for a long period of time, preventing the electrochemical device 1 from occupying a large space.

[0054] Furthermore, the first adhesive layer 130 is bonded and fixed to the fourth region 1232. The third region 1311 is attached to and fixed to the third wall unit 1133. During transportation, assembly, and use of the electrochemical device 1, the third region 1311 does not move relative to the accommodating portion 110. In contrast, the fourth region 1232 is not fixed to the third wall unit 1133 and may move relative to the third wall unit 1133, thereby affecting the fixing strength between the third region 1311 and the third wall unit 1133. The bonding of the first adhesive layer 130 and the fourth region 1232 constrains the fourth region 1232, significantly reducing its relative movement relative to the third region 1311, or even preventing relative movement. This ensures that the third extension wall 123 is maintained in the vertical position shown in FIG. 1 for a long period of time, preventing the electrochemical device 1 from occupying a large space.

[0055] Furthermore, the first adhesive layer 130 is bonded and fixed to the second wall unit 1132. Since the second wall unit 1132 is made of a flexible material, the connection between the second wall unit 1132 and the first adhesive layer 130 allows the first adhesive layer 130 to absorb more of the impact force when subjected to an impact, thereby reducing the risk of the first adhesive layer 130 and the second extension wall 122 being torn.

[0056] The shape of the first adhesive layer 130 is actually varied. For example, in some embodiments, when viewed along the first direction X, the first adhesive layer 130 is circular; in another embodiment, when viewed along the first direction X, the first adhesive layer 130 is elliptical; and in another embodiment, when viewed along the first direction X, the first adhesive layer 130 is fan-shaped.

[0057] The material of the first adhesive layer 130 is also diverse. The first adhesive layer 130 is a cured glue. After the first extension wall 121 and the third extension wall 123 are folded, a flowable glue is dripped into the first notch 1201. Once the flowable glue cures, the first adhesive layer 130 is formed. The first adhesive layer 130 is preferably a glue with high viscosity, high strength, and fast curing properties. In some embodiments, the first adhesive layer 130 comprises a one-component adhesive. For example, the one-component epoxy adhesive includes an epoxy resin matrix and a curing agent. The epoxy resin matrix includes at least one of the following materials: glycidyl ether epoxy resin, glycidyl ester epoxy resin, glycidyl amine epoxy resin, linear aliphatic epoxy resin, and alicyclic epoxy resin. The curing agent includes at least one of the following materials: dicyandiamide, aromatic diamines, imidazoles, organic hydrazide compounds, Lewis acid-amine coordination complexes, thermosensitive microcapsule-encapsulated curing agents, aromatic diazonium salts, diaryliodonium compounds, triarylsulfonium compounds, etc. In some embodiments, the first adhesive layer 130 includes a two-component adhesive. For example, the two-component adhesive includes epoxy resin AB glue; component A includes epoxy resin and a solvent, the solvent including at least one of the following materials: ethanol, propanol, propylene glycol, isopropyl alcohol, ethylene glycol monobutyl ether, acetone, butanone, benzene, and xylene; component B includes a curing agent and a filler, the curing agent including at least one of the following materials: aliphatic amines, alicyclic amines, aromatic amines, polyamides, acid anhydrides, resins, tertiary amines, acid anhydrides, and aromatic curing agents; and the filler including at least one of the following materials: asbestos or glass fiber, quartz powder, porcelain powder, iron powder, cement, corundum, alumina, porcelain powder, asbestos powder, silica gel powder, aluminum powder, copper powder, iron powder, graphite powder, talc powder, corundum, and mica powder. The mass ratio of component A to component B is 0.98 to 1.02. In some embodiments, the first adhesive layer 130 includes UV adhesive. The UV glue includes a prepolymer and an initiator; wherein the prepolymer may include any one of epoxy acrylate, polyurethane acrylate, polyether acrylate, polyester acrylate, and acrylic resin, and the initiator may include 2-hydroxy-2-methyl-1-phenyl-1-propanone or benzophenone, etc.

[0058] In some embodiments, the housing 100 satisfies the following conditions: 2 ≤ σ1 / σ2 ≤ 10, where σ1 is the tensile strength of the first adhesive layer 130 and σ2 is the tensile strength of the second extension wall 122. If σ1 / σ2 < 2, the tensile strength of the first adhesive layer 130 is lower than that of the second extension wall 122. While the first adhesive layer 130 can assist in relieving impact forces, its low tensile strength may cause it to tear before the second extension wall 122 after a few impacts, rendering it incapable of further assisting in relieving impact forces. The setting of σ1 / σ2 ≥ 2 ensures that the tensile strength of the first adhesive layer 130 is significantly higher than that of the second extension wall 122, ensuring that impact forces can be relieved for a long period of time and at a high frequency. Preferably, 4 ≤ σ1 / σ2 ≤ 6. Various testing methods are available for the tensile strength test. For example, in some embodiments, a person skilled in the art may first separate the first adhesive layer 130 from the second extension wall 122; then cut the first adhesive layer 130 into a first strip-shaped sample, and separate a second strip-shaped sample from the second extension wall 122; then, perform a tensile strength test on the first sample and the second sample using a tensile strength tester at a tensile speed of 60 mm / min, and obtain the tensile strength of each of the first adhesive layer 130 and the second extension wall 122 based on the force applied when the sample breaks and the cross-sectional area of ​​the fracture surface.

[0059] In some embodiments, the shell 100 satisfies: 1.2≤F1 / F2≤10; wherein F1 is the peeling force between the first adhesive layer 130 and the second extension wall 122; the sealing portion 120 includes two layers of the above-mentioned multi-layer sheets, each layer of the multi-layer sheet includes a metal material layer and an insulating material layer provided on both surfaces of the metal material layer, that is, the sealing portion 120 includes a metal material layer and an insulating material layer provided on the surface of the metal material layer, the above-mentioned first adhesive layer 130 is provided on the surface of the insulating material layer, and F2 is the peeling force between the metal material layer and the insulating material layer. This arrangement ensures that the bonding force between the first adhesive layer 130 and the second extension wall 122 is greater than the bonding force between the metal layer and the insulating layer in the sealing portion 120. Even if slippage occurs between the first adhesive layer 130 and the second extension wall 122, it occurs after the metal layer and the insulating layer in the sealing portion 120 have slipped. This ensures a strong bonding force between the first adhesive layer 130 and the second extension wall 122, thereby reducing the risk of the first adhesive layer 130 separating from the second extension wall 122 during use of the electrochemical device 1. Preferably, 1.2 ≤ F1 / F2 ≤ 2. There are also various testing methods for the aforementioned peeling force.

[0060] For example, in some embodiments, the peeling force F1 between the first adhesive layer 130 and the second extending wall 122 can be tested by the following method:

[0061] 1. Prepare five samples of the housing sealing portion bonded to the first adhesive layer 130. Each sample is in the shape of a strip with a length of 10 mm and a width of 5 mm.

[0062] 2. Use glue to glue the sealing portion 120 and the glass plate together, and also use glue to glue the AL-2520 aluminum standard foil and the first adhesive layer 130 together. Leave them for one hour before the strength test.

[0063] 3. Set up the sample and fixture, and peel the sample along its length at a speed of 10 mm / min to separate the sealing portion 120 from the first adhesive layer 130;

[0064] 4. Record the peel strength of the sample at 2 / 4 / 6 / 8 mm respectively, and then calculate the average peel strength of the sample at the above four locations as the peel force of the sample;

[0065] 5. Based on the peeling forces of the five samples, obtain the average peeling strength of the five samples, and use it as the peeling force between the first adhesive layer 130 and the second extension wall 122 .

[0066] For example, in some embodiments, the peeling force F2 between the metal material layer and the insulating material layer can be tested by the following method:

[0067] 1. Separate five 50mm*125mm strip specimens from a layer of multi-layer sheet of the shell;

[0068] 2. Use glue to stick the insulating material layer and the glass plate together, and use pressure-sensitive adhesive to stick the AL-2520 aluminum standard foil and another insulating material layer together. Leave them for one hour before the strength test.

[0069] 3. Set up the sample and fixture, select the program, and peel the sample along its length at a speed of 60 mm / min to separate the insulating material layer from the metal material layer;

[0070] 4. Record the strength of the sample at 20 / 40 / 60 / 80 mm respectively, and then calculate the average peel strength of the sample at the above four locations as the sample peel force;

[0071] 5. Based on the peeling forces of the five samples, obtain the average peeling strength of the five samples, and use it as the peeling force F2 between the metal material layer and the insulating material layer.

[0072] In some embodiments, the housing 100 satisfies the following: 1.3 ≤ H1 / H2 ≤ 10; where H1 is the hardness of the first adhesive layer 130, and H2 is the hardness of the second extension wall 122. Preferably, 2 ≤ H1 / H2 ≤ 4. Regarding the aforementioned hardness, various testing methods are also available. For example, in some embodiments, the hardness of the first adhesive layer 130 can be tested as follows: First, obtain a separate sample of the first adhesive layer 130; then, place the sample on a solid surface. Using a D-type Shore hardness tester, place the indenter at least 12 mm from the edge of the sample and steadily press the indenter foot onto the sample, ensuring that the indenter is vertically pressed into the sample until the indenter foot and the sample are fully in contact, taking a reading within 1 second. Thereafter, measure the hardness five times at different locations at least 6 mm apart, and take the average value (for microporous materials, the distance between the measurement points is at least 15 mm) as the hardness H1 of the first adhesive layer 130. To stabilize the test conditions and improve the test accuracy, the hardness tester should be installed on a test stand of the same model as the one produced in conjunction with the test. For example, in some embodiments, the hardness testing method for the second extension wall 122 is as follows: First, obtain a separate specimen of the second extension wall 122; then, place the specimen on a solid surface, hold a D-type Shore hardness tester, and steadily press the indenter foot onto the specimen with the indenter at least 12 mm from the edge of the specimen, so that the indenter presses vertically into the specimen until the indenter foot and the specimen are fully in contact, and read the hardness within 1 second; then, measure the hardness five times at different locations with a distance of at least 6 mm between the measuring points, and take the average value (for microporous materials, the measuring points should be at least 15 mm apart) as the hardness H2 of the second extension wall 122. Similarly, to stabilize the measurement conditions and improve the measurement accuracy, the hardness tester should be installed on a matching test stand of the same model.

[0073] Regarding the electrode assembly 200, please refer to FIG. 2 . The electrode assembly 200 is housed in the housing cavity 101 and includes a first electrode piece 210, a second electrode piece 220, and a separator 230. The first electrode piece 210 and the second electrode piece 220 have opposite polarities, and a separator 230 is provided between them to separate them. Specifically, the first electrode piece 210 and the second electrode piece 220 are both L-shaped to match the shape of the housing 100. They are alternately arranged along the first direction X, with a separator 230 provided between adjacent first electrode pieces 210 and second electrode pieces 220.

[0074] Regarding the electrode tab 300, referring to Figures 1 and 2 , the electrode tab 300 is connected to the electrode assembly 200, and one end of the electrode tab extends out of the housing 100 via the sealing portion 120. Specifically, the electrochemical device 1 includes two electrode tabs 300; one electrode tab 300 is connected to the first electrode sheet 210 and partially extends out of the housing 100 via the sixth extension wall 126, while the other electrode tab 300 is connected to the second electrode sheet 220 and partially extends out of the housing 100 via the sixth extension wall 126.

[0075] In summary, the electrochemical device 1 provided in the embodiments of the present application includes a housing 100, an electrode assembly 200, and an electrode tab 300. The housing 100 includes a housing portion 110, a sealing portion 120, and a first adhesive layer 130. The housing portion 110 defines a housing cavity 101. The sealing portion 120 is connected to the outer surface of the housing portion and is the portion of the housing 100 that achieves sealing. A first notch 1201 is defined at the edge of the sealing portion 120. The first adhesive layer 130 is disposed on the sealing portion 120, covering at least a portion of the first notch 1201.

[0076] When the second extension wall 120 is impacted, part of the impact force is transferred to the first adhesive layer 130 and removed via the first adhesive layer 130. This reduces the impact force on the second extension wall 120, thereby reducing the risk of tearing the second extension wall 120. In other words, the electrochemical device 1 provided in this embodiment of the present application can alleviate the risk of tearing of the sealing portion 120 of the current housing 100 at the notch.

[0077] It should be understood that even though the above embodiment is described with the sealing portion 120 having one notch, namely the first notch 1201, the present application is not limited thereto. In other embodiments of the present application, the sealing portion 120 may also have two or more notches. For example, FIG5 shows a schematic diagram of an electrochemical device 1b provided in another embodiment of the present application. The electrochemical device 1b still includes a housing 100b, an electrode assembly, and a tab 300b, wherein the housing 100b still includes a receiving portion 110b and a sealing portion 120b. The main differences between the electrochemical device 1b and the electrochemical device 1 in the above embodiment are:

[0078] When viewed along the first direction X, the housing portion 110 of the housing 100 of the electrochemical device 1 is L-shaped, the sealing portion 120 is provided with a first notch 1201 , and the first adhesive layer 130 covers at least a portion of the first notch 1201 ;

[0079] The housing portion 110b of the housing 100b of the electrochemical device 1b is U-shaped, and the sealing portion 120b has a second notch 1202b in addition to the first notch 1201b. Accordingly, the electrochemical device 1b further includes a second adhesive layer 140b that covers at least a portion of the second notch 1202b.

[0080] Specifically, the accommodating portion 110b includes a first wall, a second wall, and a connecting wall 113b disposed therebetween. The first and second walls are generally U-shaped and disposed opposite each other along a first direction X. The connecting wall 113b is disposed therebetween and connects the first and second walls. The connecting wall 113b includes a first wall unit 1131b, a second wall unit 1132b, a third wall unit 1133b, a fourth wall unit 1134b, a fifth wall unit 1135b, a sixth wall unit 1136b, a seventh wall unit 1137b, an eighth wall unit 1138b, a ninth wall unit 1139b, and a tenth wall unit 1130b, which are sequentially disposed along the edge contour of the first wall. Observed along the first direction X, the first wall unit 1131b extends along the second direction Y shown in the figure, the third wall unit 1133b extends along the third direction Z shown in the figure, and the fifth wall unit 1135b extends along the second direction Y shown in the figure. The second wall unit 1132b connects the first wall unit 1131b and the third wall unit 1133b, and its outer surface is concavely arranged toward the accommodating cavity. The fourth wall unit 1134b connects the third wall unit 1133b and the fifth wall unit 1135b, and its outer surface is concavely arranged toward the accommodating cavity. The first wall unit 1131b, the second wall unit 1132b, and the third wall unit 1133b together form a concave corner structure, and the third wall unit 1133b, the fourth wall unit 1134b, and the fifth wall unit 1135b together form another concave corner structure.

[0081] The sealing portion 120b includes a first extension wall 121b, a second extension wall 122b, a third extension wall 123b, a fourth extension wall 124b, a fifth extension wall 125b, a sixth extension wall 126b, a seventh extension wall 127b, an eighth extension wall 128b, and a ninth extension wall 129b. The first extension wall 121b includes a first region 1211b extending from the surface of the first wall unit 1131b, with one end connected to the first wall unit 1131b and the other end extending toward the second wall unit. The second extension wall 122b extends from the surface of the second wall unit 1132b, with one end connected to the second wall unit 1132b and the other end extending away from the second wall unit 1132b, and is disposed generally parallel to the first and second walls. The third extension wall 123b includes a third region 1231b extending outward from the surface of the third wall unit 1133b, one end of which is connected to the third wall unit 1133 and the other end of which extends toward the second wall 112. The fourth extension wall 124 extends from the surface of the fourth wall unit 1134, one end of which is connected to the fourth wall unit 1134b and the other end of which extends away from the fourth wall unit 1134b, and is disposed generally parallel to the first and second walls. The fifth extension wall 125 includes a sixth region 1251b extending outward from the surface of the fifth wall unit 1135, one end of which is connected to the fifth wall unit 1135 and the other end of which extends toward the second wall. The sixth extension wall 126 extends from the surface of the sixth wall unit 1136b, one end of which is connected to the sixth wall unit 1136b and the other end of which extends toward the second wall. The seventh extension wall 127 extends from the surface of the seventh wall unit 1137b, with one end connected to the seventh wall unit 1137b and the other end extending toward the second wall. The eighth extension wall 128b extends from the surface of the eighth wall unit 1138b, with one end connected to the eighth wall unit 1138b and the other end extending toward the second wall. The ninth extension wall 129b extends from the surface of the tenth wall unit 1130b, with one end connected to the tenth wall unit 1130b and the other end extending away from the tenth wall unit 1130b, generally parallel to the first and second walls. The tab extends out of the housing 100b via the ninth extension wall 129b.

[0082] The second extension wall 122b is provided with a first notch 1201b, and the setting method of the first notch 1201b is basically the same as the above-mentioned first notch 1201. The above-mentioned first extension wall 121b also includes a second area 1212b, and the third extension wall 123b also includes a fourth area 1232b. The setting methods of the second area 1212b and the fourth area 1232b are basically the same as the above-mentioned second area 1212 and the fourth area 1232, and are not repeated here.

[0083] The fourth extension wall 124b is provided with a second notch 1202b, which is located between the third extension wall 123b and the fifth extension wall 125b. When viewed along the first direction X, the end of the third extension wall 123b facing away from the second extension wall 122b extends to the second notch 1202b, and one end of the fifth extension wall 125b also extends to the second notch 1202b. The provision of the second notch 1202b disconnects the third extension wall 123b from the fifth extension wall 125b. This allows the third and fifth extension walls 123b, 125b to be folded over to fit against the connecting wall 113b during the folding process of the sealing portion 120b, thereby facilitating the bonding of the third and fifth extension walls 123b, 125b to the connecting wall 113b.

[0084] In this embodiment, the edge of the fourth extension wall 124b facing away from the fourth wall unit 1134b has a third edge connected to the third region 1231b. The edge of the fourth extension wall 124b facing away from the fourth wall unit 1134b has a fourth edge connected to the sixth region 1251b. Accordingly, the third extension wall 123b further includes a fifth region 1233b. This second region 1233b extends from the third edge, with one end connected to the third edge of the fourth extension wall and the other end extending toward the second wall. This fifth region 1233b forms an integral structure with the third region 1231b. The fifth extension wall 125b further includes a seventh region 1252b. This seventh region 1252b extends from the fourth edge, with one end connected to the fourth edge of the fourth extension wall and the other end extending toward the second wall. This seventh region 1232 forms an integral structure with the sixth region 1231. That is, the first gap 1201 is located between the fifth area 1233 and the seventh area 1252 .

[0085] The second adhesive layer 140b is disposed on the fourth extension wall 124b and covers at least a portion of the second notch 1202. The specific arrangement of the second adhesive layer 140 on the fourth extension wall 124b can be referred to the arrangement of the first adhesive layer 130 on the second extension wall 122 and is not repeated here.

[0086] In the electrochemical device 1b provided in this embodiment, the sealing portion 120b of the housing 100b is provided with two notches: a first notch 1201b and a second notch 1202b. A first adhesive layer 130b covers at least a portion of the first notch 1201b, and a second adhesive layer 140b covers at least a portion of the second notch 1202b. When the second extension wall 122b and the fourth extension wall 124b are impacted, part of the impact force is transferred to the first and second adhesive layers 130b, 140b, and removed via the first and second adhesive layers 130b, 140b. This reduces the impact force on the second and fourth extension walls 122b, 124b, thereby reducing the risk of tearing of the second and fourth extension walls 122b, 124b. In other words, the electrochemical device 1 provided in this embodiment can mitigate the risk of tearing of the sealing portion 120b of the housing 100b at the notches.

[0087] Based on the same inventive concept, the present application also provides a shell, which has the same structure as the shell in the above embodiment and will not be described in detail here.

[0088] Based on the same inventive concept, another embodiment of the present application further provides an electronic device 2. Specifically, please refer to FIG6 , which shows a schematic diagram of the electronic device 2. In conjunction with FIG1 to FIG5 , the electronic device 2 includes the electrochemical device 1 (or 1b) described in any of the above embodiments. In this embodiment, the electronic device is a mobile phone; it is understood that in other embodiments of the present application, the electronic device may also be any other electronic device, such as a tablet, a computer, a drone, a remote control, an electric car, or the like.

[0089] Since the electronic device 2 includes the electrochemical device described above, it can improve the risk of the sealing portion of the shell of the current electrochemical device being easily torn at the notch.

[0090] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Based on the concept of the present application, the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations in different aspects of the present application as described above. For the sake of simplicity, they are not provided in detail. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A housing, comprising a housing portion and a sealing portion, wherein the housing portion defines a housing cavity, and the sealing portion is connected to an outer surface of the housing portion, characterized in that: The shell includes a first adhesive layer, and a first notch is provided on the edge of the sealing portion, the first notch has a first edge and a second edge, the first adhesive layer is arranged on the sealing portion, and along the thickness direction of the shell, the projection of the first adhesive layer covers at least part of the first notch and connects the first edge and the second edge.

2. The housing according to claim 1, wherein: The accommodating portion includes a first wall, a second wall, and a connecting wall, wherein the first wall and the second wall are arranged opposite to each other along a first direction, the connecting wall connects the first wall and the second wall, and the first wall, the second wall, and the connecting wall together enclose the accommodating cavity, and the sealing portion is connected to the connecting wall; The first direction is a thickness direction of the shell.

3. The housing according to claim 2, wherein: The connecting wall includes a first wall unit, a second wall unit, and a third wall unit sequentially connected along the edge contour of the first wall. When viewed along the thickness direction, the extension directions of the first wall unit and the third wall unit intersect. The outer surface of the second wall unit is concave toward the accommodating cavity. The first wall unit, the second wall unit, and the third wall unit together form a concave corner structure. The sealing portion includes a first extension wall, a second extension wall and a third extension wall, the first extension wall includes a first area, the first area is extended outward from the surface of the first wall unit, the second extension wall is extended outward from the surface of the second wall unit, the edge of the second extension wall is provided with the first notch, the third extension wall includes a third area, the third area is extended outward from the surface of the third wall unit, along the first direction, one end of the first extension wall and the third extension wall are respectively connected to the connecting wall, and the other ends of the first extension wall and the third extension wall respectively extend toward the second wall.

4. The housing according to claim 3, wherein: The edge of the second extension wall facing away from the second wall unit has a first sideline connected to the first area, and the first extension wall further includes a second area connected to the first area, and the second area extends from the first sideline toward the second wall; An edge of the second extension wall away from the second wall unit has a second sideline connected to the third area. The third extension wall further includes a fourth area connected to the third area. The fourth area extends from the second sideline toward the second wall.

5. The housing according to claim 4, wherein: The first adhesive layer is bonded and fixed to the second region; and / or, The first adhesive layer is bonded and fixed to the fourth region; and / or, The first adhesive layer is bonded and fixed to the second wall unit.

6. The housing according to claim 2, wherein: The first gap is filled with the first glue layer.

7. The housing according to claim 2, wherein: When viewed along the first direction, the first adhesive layer is circular, elliptical or fan-shaped.

8. The housing according to claim 3, wherein: The connecting wall includes a third wall unit, a fourth wall unit, and a fifth wall unit sequentially connected along the edge contour of the first wall. When viewed along the first direction, the extension directions of the third wall unit and the fifth wall unit intersect. The outer surface of the fourth wall unit is concave toward the accommodating cavity. The third wall unit, the fourth wall unit, and the fifth wall unit together form a concave corner structure. The sealing portion further includes a fourth extension wall and a fifth extension wall, the fourth extension wall extending outwardly from a surface of the fourth wall unit, an edge of the fourth extension wall being provided with a second notch, the fifth extension wall including a sixth region extending outwardly from a surface of the fifth wall unit, one end of the fifth extension wall being connected to the connecting wall along the first direction, and the other end of the fifth extension wall extending toward the second wall; The housing further includes a second adhesive layer, which is disposed on the sealing portion and covers at least a portion of the second notch.

9. The housing according to claim 8, It is characterized by: The edge of the fourth extension wall facing away from the fourth wall unit has a third sideline connected to the third area, and the third extension wall further includes a fifth area extending from the third sideline toward the second wall; An edge of the fourth extension wall away from the fourth wall unit has a fourth sideline connected to the sixth region. The fifth extension wall further includes a seventh region extending from the fourth sideline toward the second wall.

10. The housing according to claim 8, wherein When viewed along the first direction, the receiving portion is L-shaped or U-shaped.

11. The housing according to claim 3, wherein: The tensile strength of the first adhesive layer is σ1, the tensile strength of the second extension wall is σ2, and 2≤σ1 / σ2≤10.

12. The housing according to claim 11, wherein: 3≤σ1 / σ2≤4.

13. The housing according to claim 3, wherein: The peeling force between the first adhesive layer and the second extension wall is F1; The sealing portion includes a metal material layer and an insulating material layer provided on the surface of the metal material layer. The first adhesive layer is provided on the surface of the insulating material layer. The peeling force between the metal material layer and the insulating material layer is F2, 1.2≤F1 / F2≤10.

14. The housing according to claim 13, wherein: 1.2≤F1 / F2≤2.

15. The housing according to claim 3, wherein: The hardness of the first adhesive layer is H1, the hardness of the second extension wall is H2, and 1.3≤H1 / H2≤10.

16. The housing according to claim 15, wherein: 2≤H1 / H2≤4.

17. The housing according to any one of claims 2 to 10, characterized in that The sealing portion is connected to one end of the connecting wall along the first direction.

18. The housing according to claim 2, wherein: When viewed along the first direction, the first notch passes through the sealing portion.

19. An electrochemical device, characterized in that include: The housing according to any one of claims 1 to 18; The electrode assembly is housed in the accommodating cavity; as well as A tab, one end of which is connected to the electrode assembly, and the other end of which extends out of the shell through the sealing portion.

20. An electronic device, characterized in that: Comprising the electrochemical device of claim 19.

Images