Housing, electrochemical device, and electronic device

Abstract

The application discloses a shell, an electrochemical device and an electronic device, and relates to the technical field of batteries. The shell body has a containing cavity, an edge sealing part is connected to the shell body, the edge sealing part is located outside the containing cavity, the edge sealing part comprises a first sealing section and a second sealing section which are attached to each other, at least one of the first sealing section and the second sealing section has a groove, at least part of the structure of the adhesive part is located in the groove, and the first sealing section and the second sealing section are both bonded to the adhesive part. In the embodiment of the application, the edge sealing part has a groove, and at least part of the structure of the adhesive part is located in the groove. The edge sealing part can increase the contact area between the adhesive part and the edge sealing part through the groove, thereby increasing the connection strength of the adhesive part and the edge sealing part to a certain extent, the adhesive part is less likely to be separated from the edge sealing part, and the adhesive part can more stably bond the first sealing section and the second sealing section together, so that the edge sealing part can more stably seal the containing cavity.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a casing, electrochemical device, and electronic device. Background Technology

[0002] With the development of new energy sources, more and more fields are adopting new energy as a power source. Due to its advantages such as high energy density, rechargeability, safety, and environmental friendliness, battery devices are widely used in new energy vehicles, consumer electronics, energy storage systems, and other fields. Among them, the electrode components of electrochemical devices need to be protected by a shell, and the sealing edges of the shell need to be coated with adhesive to prevent the aluminum layer from being exposed.

[0003] In related technologies, the connection strength of the edge banding is relatively low. Utility Model Content

[0004] This application aims to address at least one of the technical problems existing in the prior art. To this end, this application proposes a housing, an electrochemical device, and an electronic device to increase the connection strength of the sealing portion.

[0005] A housing according to a first aspect embodiment of the present application is used in an electrochemical device, the housing comprising: The shell body has a receiving cavity; A sealing portion is connected to the housing body and is located outside the receiving cavity. The sealing portion includes a first encapsulation segment and a second encapsulation segment that fit together. Both the first encapsulation segment and the second encapsulation segment are connected to the housing body. At least one of the first encapsulation segment and the second encapsulation segment has a groove. An adhesive portion, at least a portion of which is located within the groove, wherein both the first encapsulation segment and the second encapsulation segment are bonded to the adhesive portion.

[0006] The housing according to the embodiments of this application has at least the following beneficial effects: In the embodiment of this application, the sealing portion includes a first encapsulation segment and a second encapsulation segment that fit together. The sealing portion has a groove, and at least a portion of the adhesive portion is located within the groove. The groove increases the contact area between the adhesive portion and the sealing portion, thereby increasing the connection strength between them to a certain extent. The adhesive portion is less likely to detach from the sealing portion, thus allowing it to stably bond the first encapsulation segment and the second encapsulation segment together, and consequently, the sealing portion can stably close the receiving cavity.

[0007] According to some embodiments of this application, the first encapsulation segment includes a first aluminum layer, the second encapsulation segment includes a second aluminum layer, the dimension of the sealing portion along the thickness direction of the sealing portion is a first dimension D1, the dimension of the adhesive portion is a second dimension D2, and the distance between the first aluminum layer and the second aluminum layer is a third dimension D3, wherein the second dimension D2 is less than or equal to the first dimension D1, and the second dimension D2 is greater than the third dimension D3.

[0008] According to some embodiments of this application, the second dimension is greater than or equal to 115 μm and less than or equal to 255 μm.

[0009] According to some embodiments of this application, both the first encapsulation segment and the second encapsulation segment have the groove, the groove corresponding to the first encapsulation segment is a first groove, the groove corresponding to the second encapsulation segment is a second groove, the first groove and the second groove are interconnected, and the adhesive portion is provided in both the first groove and the second groove.

[0010] According to some embodiments of this application, the first encapsulation segment includes a first nylon layer, a first aluminum layer, and a first heat-sealing layer that are bonded together, and the second encapsulation segment includes a second nylon layer, a second aluminum layer, and a second heat-sealing layer that are bonded together. The first heat-sealing layer and the second heat-sealing layer are bonded together, and the first nylon layer, the first aluminum layer, the first heat-sealing layer, the second heat-sealing layer, the second aluminum layer, and the second nylon layer are all bonded to the adhesive portion.

[0011] According to some embodiments of this application, along the length direction of the sealing portion, the first heat-sealing layer and the second heat-sealing layer protrude from the first aluminum layer, the first nylon layer and the second nylon layer protrude from the first heat-sealing layer, and the adhesive portion includes a first adhesive body and a second adhesive body connected to each other. The first adhesive body is bonded to the circumference of the first heat-sealing layer and the second heat-sealing layer and the ends of the first aluminum layer and the second aluminum layer, and the second adhesive body is bonded to the ends of the first heat-sealing layer and the second heat-sealing layer and the side of the first nylon layer and the second nylon layer facing the first heat-sealing layer.

[0012] According to some embodiments of this application, the first groove and the second groove are located between the outer side surface of the first nylon layer and the outer side surface of the second nylon layer, and projected along the length direction of the sealing portion. The projection area of ​​the first groove covers the projection area of ​​the first encapsulation segment, and the projection area of ​​the second groove covers the projection area of ​​the second encapsulation segment.

[0013] According to some embodiments of this application, the first encapsulation segment includes a first nylon layer, the second encapsulation segment includes a second nylon layer, the first nylon layer and the second nylon layer are respectively located on the outer side of the sealing portion along the thickness direction of the sealing portion, the first nylon layer and / or the second nylon layer are recessed to form a groove along the length direction of the sealing portion, the adhesive portion includes a third adhesive body and a fourth adhesive body connected to each other, the third adhesive body and the fourth adhesive body are arranged along the thickness direction of the sealing portion, the third adhesive portion is bonded to the groove wall of the groove, and the fourth adhesive portion is bonded to the end of the sealing portion.

[0014] Embodiments of this application also provide an electrochemical device, comprising: The casing of any of the above; The electrode assembly is located within the receiving cavity.

[0015] Embodiments of this application also provide an electronic device, including: Equipment body; At least one electrochemical device according to any one of the above, said electrochemical device being used to supply power to the main body of the device.

[0016] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0017] The present application will be further described below with reference to the accompanying drawings and embodiments, wherein: Figure 1 This is a simplified structural diagram of an electrochemical device in one embodiment of this application; Figure 2 This is a schematic diagram of the structure of the sealing portion and the adhesive portion in the first embodiment of this application; Figure 3 This is a schematic diagram of the structure of the sealing portion and the adhesive portion in the second embodiment of this application; Figure 4 This is a schematic diagram of the structure of the sealing portion and the adhesive portion in the third embodiment of this application; Figure 5 This is a schematic diagram of the structure of the sealing portion and the adhesive portion in the fourth embodiment of this application.

[0018] Figure label: 100, Housing body; 100a, Receiving cavity; 200, Sealing edge; 200a, Groove; 200b, Adhesive surface; 210, First encapsulation section; 210a, First groove; 211, First nylon layer; 212, First aluminum layer; 213, First heat-sealing layer; 220, Second encapsulation section; 220a, Second groove; 221, Second nylon layer; 222, Second aluminum layer; 223, Second heat-sealing layer; 300, Adhesive part; 310, First adhesive body; 320, Second adhesive body; 330, Third adhesive body; 340, Fourth adhesive body; 400, Electrode assembly. Detailed Implementation

[0019] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0020] In the description of this application, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0021] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0022] In the description of this application, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0023] Currently, judging from market trends, the application of electrochemical devices is becoming increasingly widespread. Electrochemical devices are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely applied in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in aerospace and other fields. With the continuous expansion of the application areas of electrochemical devices, the market demand is also constantly increasing.

[0024] In related technologies, in the structure of a battery cell, the cell is usually provided with a sealing edge to close the housing cavity. The end of the sealing edge usually needs to be coated with adhesive to bond the two shell layers together. Since the end of the sealing edge is a plane, the bonding area between the adhesive and the sealing edge is small when adhesive is applied, making it easier for the adhesive to detach from the sealing edge, thus leading to seal failure.

[0025] The sealing portion 200 of this embodiment has a groove 200a, and at least a portion of the adhesive portion 300 is located in the groove 200a. The first encapsulation segment 210 and the second encapsulation segment 220 are both connected to the adhesive portion 300. The adhesive surface area 200b between the adhesive portion 300 and the sealing portion 200 is large, so the adhesive portion 300 is difficult to detach from the sealing portion 200. The first encapsulation segment 210 and the second encapsulation segment 220 can maintain a relatively stable bond.

[0026] This application provides an electronic device, which includes a device body and an electrochemical device for supplying power to the device body.

[0027] Electronic devices can be, for example, mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships, and spacecraft.

[0028] The technical solutions described in the embodiments of this application are not limited to the devices described above, but can also be applied to all devices that use electrochemical devices.

[0029] The electrochemical devices mentioned in the embodiments of this application may include one or more electrochemical device assemblies for providing voltage and capacity. An electrochemical device assembly may include multiple electrochemical devices, which are connected in series, parallel, or mixed configurations via a busbar.

[0030] In some embodiments, the electrochemical device assembly is typically formed by arranging multiple electrochemical devices.

[0031] As an example, the electrochemical device assembly can be a battery module, which consists of multiple electrochemical devices arranged and fixed together to form a single module. As another example, a battery module can be formed by bundling multiple electrochemical devices together with cable ties.

[0032] In some embodiments, the electrochemical device may be a battery pack, which includes a housing and one or more electrochemical device components housed within the housing.

[0033] This application also provides a battery pack, which includes a housing and at least one electrochemical device located inside the housing.

[0034] In some embodiments of this application, the electrochemical device can be a secondary battery, which refers to an electrochemical device that can be used again after being discharged by recharging to activate the active material.

[0035] The electrochemical device can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0036] This application provides a housing; please refer to [the relevant documentation]. Figure 1 and Figure 2 The housing is used in an electrochemical device and includes a housing body 100, a sealing portion 200, and an adhesive portion 300. The housing body 100 has a receiving cavity 100a for accommodating an electrode assembly 400. The sealing portion 200 is connected to the housing body 100. Exemplarily, the sealing portion 200 is integrally formed with the housing body 100 and is formed by bending the housing. The sealing portion 200 is located outside the receiving cavity 100a and includes a first encapsulation section 210 and a second encapsulation section 220 that fit together. Both the first encapsulation section 210 and the second encapsulation section 220 are connected to the housing body 100, and the sealing portion 200 has a groove 200a. The first encapsulation segment 210 and the second encapsulation segment 220 are formed by bending two opposing sidewalls of the housing. Along the thickness direction of the sealing edge portion 200, the first encapsulation segment 210 and the second encapsulation segment 220 are fitted together. The sealing edge portion 200 is recessed along its length direction to form a groove 200a. The length direction of the sealing edge portion 200 is perpendicular to its thickness direction. At least a portion of the adhesive portion 300 is located within the groove 200a and is bonded to the groove wall of the groove 200a. Both the first encapsulation segment 210 and the second encapsulation segment 220 are bonded to the adhesive portion 300. The groove 200a is formed in at least one of the first encapsulation segment 210 and the second encapsulation segment 220.

[0037] In the embodiment of this application, the sealing portion 200 includes a first encapsulation segment 210 and a second encapsulation segment 220 that are fitted together. The sealing portion 200 has a groove 200a, and at least a portion of the structure of the adhesive portion 300 is located within the groove 200a. The groove 200a increases the contact area between the sealing portion 200 and the adhesive portion 300, thereby increasing the connection strength between the adhesive portion 300 and the sealing portion 200 to a certain extent. The adhesive portion 300 is less likely to detach from the sealing portion 200, thus the adhesive portion 300 can more stably bond the first encapsulation segment 210 and the second encapsulation segment 220 together, and the sealing portion 200 can more stably seal the receiving cavity 100a.

[0038] In one embodiment, please refer to Figure 2 The first encapsulation segment 210 includes a first aluminum layer 212, and the second encapsulation segment 220 includes a second aluminum layer 222. Along the thickness direction of the sealing portion 200, the dimension of the sealing portion 200 is a first dimension, the dimension of the adhesive portion 300 is a second dimension, and the distance between the first aluminum layer 212 and the second aluminum layer 222 is a third dimension. The second dimension is less than or equal to the first dimension, and the second dimension is greater than the third dimension. For example, along the thickness direction of the sealing portion 200, the first aluminum layer 212 and the second aluminum layer 222 are arranged at intervals, and the distance between the first aluminum layer 212 and the second aluminum layer 222 is the distance between the surface of the first aluminum layer 212 facing away from the second aluminum layer 222 and the surface of the second aluminum layer 222 facing away from the first aluminum layer 212. The adhesive portion 300 can cover the maximum width of the aluminum layer and is smaller than the size of the sealing portion 200. This allows the adhesive surface area 200b between the adhesive portion 300 and the sealing portion 200 to be as large as possible, while preventing the adhesive portion 300 from extending beyond the sealing portion 200 along the thickness direction of the sealing portion 200. This reduces the impact of the adhesive portion 300 on the energy density of the corresponding electrochemical device.

[0039] In one embodiment, the second dimension is greater than or equal to 115 μm and less than or equal to 255 μm. Exemplarily, the second dimension can be 115 μm, 135 μm, 155 μm, 175 μm, 195 μm, 215 μm, 235 μm, or 255 μm. When the second dimension is within a suitable range, it allows for a larger bonding surface area 200b between the adhesive portion 300 and the sealing portion 200, while also controlling the manufacturing cost of the housing and the impact of the adhesive portion 300 on the energy density of the corresponding electrochemical device to a certain extent.

[0040] In one embodiment, please refer to Figure 2 Both the first encapsulation segment 210 and the second encapsulation segment 220 have grooves 200a. The groove 200a corresponding to the first encapsulation segment 210 is called the first groove 210a, and the groove 200a corresponding to the second encapsulation segment 220 is called the second groove 220a. The first groove 210a and the second groove 220a are interconnected, and each of the first groove 210a and the second groove 220a is provided with an adhesive portion 300. The adhesive portion 300 can bond to the first encapsulation segment 210 and the second encapsulation segment 220 respectively through the first groove 210a and the second groove 220a. As a result, the adhesive surface area 200b between the adhesive portion 300 and the first encapsulation segment 210 and the second encapsulation segment 220 is relatively large, and thus the adhesive strength between the adhesive portion 300 and the first encapsulation segment 210 and the second encapsulation segment 220 is relatively large. The adhesive portion 300 can relatively stably fix and bond the first encapsulation segment 210 and the second encapsulation segment 220, and the sealing portion 200 can relatively stably close the receiving cavity 100a.

[0041] It is understood that other embodiments of this application are not limited to the first encapsulation segment 210 having a first groove 210a and the second encapsulation segment 220 having a second groove 220a, with an adhesive portion 300 provided in both the first groove 210a and the second groove 220a. Exemplarily, one of the first encapsulation segment 210 and the second encapsulation segment 220 has a groove 200a, a portion of the adhesive portion 300 is located within the groove 200a, and another portion of the adhesive portion 300 is adhered to the end of the other.

[0042] In one embodiment, please refer to Figure 2 The first encapsulation segment 210 includes a first nylon layer 211, a first aluminum layer 212, and a first heat-sealing layer 213 that are bonded together. The second encapsulation segment 220 includes a second nylon layer 221, a second aluminum layer 222, and a second heat-sealing layer 223 that are bonded together. The first heat-sealing layer 213 and the second heat-sealing layer 223 are bonded together. The first groove 210a and the second groove 220a are located between the first nylon layer 211 and the second nylon layer 221. The first nylon layer 211, the first aluminum layer 212, the first heat-sealing layer 213, the second heat-sealing layer 223, the second aluminum layer 222, and the second nylon layer 221 are all bonded to the adhesive portion 300. Exemplarily, along the direction from the receiving cavity 100a toward the sealing portion 200, the first nylon layer 211, the first aluminum layer 212, the first heat-sealing layer 213, the second heat-sealing layer 223, the second aluminum layer 222, and the second nylon layer 221 are arranged sequentially and bonded together. Furthermore, the adhesive portion 300 can bond the multi-layer structure of the first encapsulation segment 210 and the multi-layer structure of the second encapsulation segment 220 together, thereby reducing the dispersion of the first encapsulation segment 210 or the second encapsulation segment 220 to a certain extent.

[0043] In one embodiment, please refer to Figure 3Along the length of the sealing portion 200, the first heat-sealing layer 213 and the second heat-sealing layer 223 protrude from the first aluminum layer 212, and the first nylon layer 211 and the second nylon layer 221 protrude from the first heat-sealing layer 213. The adhesive portion 300 includes a first adhesive body 310 and a second adhesive body 320 that are connected to each other. Exemplarily, the first adhesive body 310 and the second adhesive body 320 are integrally formed. The first adhesive body 310 is bonded to the circumferential sidewalls of the first heat-sealing layer 213 and the second heat-sealing layer 223. The surface of the first adhesive body 310 facing away from the first heat-sealing layer 213 and the second heat-sealing layer 223 is bonded to the first nylon layer 211 and the second nylon layer 221. The first adhesive 310 is also bonded to the ends of the first aluminum layer 212 and the second aluminum layer 222. The second adhesive 320 is bonded to the ends of the first heat-sealing layer 213 and the second heat-sealing layer 223, as well as to the side of the first nylon layer 211 and the second nylon layer 221 facing the first heat-sealing layer 213. The first heat-sealing layer 213 and the second heat-sealing layer 223 protrude from the first aluminum layer 212, so that the first adhesive 310 can be bonded to the side of the first heat-sealing layer 213 and the second heat-sealing layer 223, and the bonding surface 200b of the adhesive portion 300 has a large area. Furthermore, the first nylon layer 211 and the second nylon layer 221 protrude from the first heat-sealing layer 213, and the groove 200a can be formed between the first nylon layer 211 and the second nylon layer 221. The first nylon layer 211 and the second nylon layer 221 can constrain the adhesive portion 300 to a certain extent, thereby further reducing the possibility of the adhesive portion 300 detaching from the sealing portion 200. For example, the first heat-sealing layer 213 and the second heat-sealing layer 223 protrude from the first filter layer by equal distances, and the first nylon layer 211 and the second nylon layer 221 protrude from the first heat-sealing layer 213 by equal distances.

[0044] In one embodiment, please refer to Figure 4 The groove 200a and one end of the sealing portion 200 have an adhesive surface 200b, which is an arc-shaped surface recessed towards the sealing portion 200. Exemplarily, the adhesive surface 200b is an arc-shaped surface. When the adhesive portion 300 is located in the groove 200a and cured, the arc-shaped adhesive surface 200b can reduce stress concentration between the sealing portion 200 and the adhesive portion 300, making it less likely for the sealing portion 200 to break. It is understood that other embodiments of this application do not limit the shape of the adhesive surface 200b; the shape of the adhesive surface 200b can also be a slope, or a bent surface approximately "W" shaped.

[0045] In one embodiment, please refer to Figure 2The first groove 210a and the second groove 220a are located between the outer surfaces of the first nylon layer 211 and the second nylon layer 221, projected along the length of the sealing portion 200. The projected area of ​​the first groove 210a covers the projected area of ​​the first encapsulation segment 210, and the projected area of ​​the second groove 220a covers the projected area of ​​the second encapsulation segment 220. The adhesive surface area 200b between the first groove 210a and the second groove 220a and the sealing portion 200 is as large as possible, thereby further reducing the possibility of the adhesive portion 300 and the sealing portion 200 detaching from each other.

[0046] In one embodiment, please refer to Figure 5 The first encapsulation section 210 includes a first nylon layer 211, and the second encapsulation section 220 includes a second nylon layer 221. Along the thickness direction of the sealing portion 200, the first nylon layer 211 and the second nylon layer 221 are respectively located on the outer side of the sealing portion 200. Along the length direction of the sealing portion 200, the first nylon layer 211 and / or the second nylon layer 221 are recessed to form a groove 200a. The adhesive portion 300 includes a third adhesive body 330 and a fourth adhesive body 340 that are connected to each other. The third adhesive body 330 and the fourth adhesive body 340 are arranged along the thickness direction of the sealing portion 200. The third adhesive portion 300 is bonded to the groove wall of the groove 200a, and the fourth adhesive portion 300 is bonded to the end of the sealing portion 200. For example, when the first nylon layer 211 is recessed to form a groove 200a, the third adhesive 330 is bonded to the side of the first aluminum layer 212; when the second nylon layer 221 is recessed to form a groove 200a, the third adhesive 330 is bonded to the side of the second aluminum layer 222. The groove 200a is easier to process, and the bonding strength between the adhesive portion 300 and the sealing portion 200 is higher.

[0047] Embodiments of this application also provide an electrochemical device, which includes a housing and an electrode assembly 400 as described above. The electrode assembly 400 is located within a receiving cavity 100a. Exemplarily, the electrochemical device can be a pouch cell. Exemplarily, the electrode assembly 400 includes an anode plate, a cathode plate, and a separator, with the separator located between the anode plate and the cathode plate.

[0048] The above embodiments are merely illustrative of the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and all should be covered within the scope of the specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of protection.

Claims

1. A housing, characterized in that, include: The shell body has a receiving cavity; A sealing portion is connected to the housing body and is located outside the receiving cavity. The sealing portion includes a first encapsulation segment and a second encapsulation segment that fit together. Both the first encapsulation segment and the second encapsulation segment are connected to the housing body. At least one of the first encapsulation segment and the second encapsulation segment has a groove. An adhesive portion, at least a portion of which is located within the groove, wherein both the first encapsulation segment and the second encapsulation segment are bonded to the adhesive portion.

2. The housing according to claim 1, characterized in that, The first encapsulation segment includes a first aluminum layer, and the second encapsulation segment includes a second aluminum layer. Along the thickness direction of the sealing portion, the dimension of the sealing portion is a first dimension D1, the dimension of the adhesive portion is a second dimension D2, and the distance between the first aluminum layer and the second aluminum layer is a third dimension D3. The second dimension D2 is less than or equal to the first dimension D1, and the second dimension D2 is greater than the third dimension D3.

3. The housing according to claim 2, characterized in that, The second dimension D2 is greater than or equal to 115 μm and less than or equal to 255 μm.

4. The housing according to claim 1, characterized in that, Both the first encapsulation segment and the second encapsulation segment have the groove. The groove corresponding to the first encapsulation segment is a first groove, and the groove corresponding to the second encapsulation segment is a second groove. The first groove and the second groove are interconnected, and the adhesive portion is provided in both the first groove and the second groove.

5. The housing according to claim 4, characterized in that, The first encapsulation segment includes a first nylon layer, a first aluminum layer, and a first heat-sealing layer that are bonded together. The second encapsulation segment includes a second nylon layer, a second aluminum layer, and a second heat-sealing layer that are bonded together. The first heat-sealing layer and the second heat-sealing layer are bonded together. The first nylon layer, the first aluminum layer, the first heat-sealing layer, the second heat-sealing layer, the second aluminum layer, and the second nylon layer are all bonded to the adhesive portion.

6. The housing according to claim 5, characterized in that, Along the length of the sealing portion, the first heat-sealing layer and the second heat-sealing layer protrude from the first aluminum layer, and the first nylon layer and the second nylon layer protrude from the first heat-sealing layer. The adhesive portion includes a first adhesive body and a second adhesive body that are connected to each other. The first adhesive body is bonded to the circumference of the first heat-sealing layer and the second heat-sealing layer and to the ends of the first aluminum layer and the second aluminum layer. The second adhesive body is bonded to the ends of the first heat-sealing layer and the second heat-sealing layer and to the side of the first nylon layer and the second nylon layer facing the first heat-sealing layer.

7. The housing according to claim 5, characterized in that, The first groove and the second groove are located between the outer side surface of the first nylon layer and the outer side surface of the second nylon layer, and are projected along the length direction of the sealing portion. The projection area of ​​the first groove covers the projection area of ​​the first encapsulation segment, and the projection area of ​​the second groove covers the projection area of ​​the second encapsulation segment.

8. The housing according to claim 1, characterized in that, The first encapsulation segment includes a first nylon layer, and the second encapsulation segment includes a second nylon layer. Along the thickness direction of the sealing portion, the first nylon layer and the second nylon layer are respectively located on the outer side of the sealing portion. Along the length direction of the sealing portion, the first nylon layer and / or the second nylon layer are recessed to form a groove. The adhesive portion includes a third adhesive body and a fourth adhesive body that are connected to each other. The third adhesive body and the fourth adhesive body are arranged along the thickness direction of the sealing portion. The third adhesive portion is bonded to the groove wall of the groove, and the fourth adhesive portion is bonded to the end of the sealing portion.

9. An electrochemical device, characterized in that, include: The housing as described in any one of claims 1 to 8; The electrode assembly is located within the receiving cavity.

10. An electronic device, characterized in that, include: Equipment body; At least one electrochemical device as described in claim 9, wherein the electrochemical device is used to supply power to the main body of the device.

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