Electrochemical device and electronic equipment

Abstract

The application provides an electrochemical device and an electronic device. The electrochemical device comprises an electrode assembly, a packaging shell and an adhesive. The packaging shell comprises a main body and a sealing edge. The electrode assembly is arranged in the main body. The sealing edge comprises a first section and a second section. The second section has a first end and a second end. The first section connects the main body and the first end. The second end is arranged between the first section and the side of the main body. The adhesive is arranged between the side of the main body and the second section. The second section is connected to the adhesive. In the thickness direction of the electrode assembly, the end of the adhesive exceeds the second end of the second section, and the adhesive covers the second end. The adhesive can seal the second end and avoid the direct contact between the second end and the side of the main body. When the electrochemical device falls or is impacted, the adhesive can buffer the impact force of the second end on the main body, and the risk of damage to the packaging shell is reduced.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more specifically, to electrochemical devices and electronic devices. Background Technology

[0002] In pouch battery packaging, to prevent cell corrosion or short circuits, the sealing edges of the packaging shell need to be trimmed and folded to enclose the internal cell structure, while simultaneously reducing battery width and increasing energy density. However, when the battery is dropped or impacted, the folded edges can easily puncture the packaging shell, leading to battery damage and unusable conditions, and also posing safety hazards. Summary of the Invention

[0003] This application provides electrochemical devices and electronic devices to solve the aforementioned technical problems.

[0004] The embodiments of this application are implemented as follows:

[0005] An electrochemical device includes an electrode assembly, a packaging shell, and an adhesive component. The packaging shell includes a main body and a sealing portion. The electrode assembly is disposed within the main body, and the sealing portion is located on the side of the main body. The sealing portion includes a folded first section and a second section. The second section has a first end and a second end. The first section connects the main body and the first end, and the second end is located between the first section and the side of the main body. The adhesive component is adhered between the side of the main body and the second section. The second section is connected to the adhesive component. Along the thickness direction of the electrode assembly, the end of the adhesive component extends beyond the second end and covers the second end. This allows the adhesive component to seal the second end while preventing direct contact between the second end and the side of the main body. Therefore, in the event of a drop or impact to the electrochemical device, the adhesive component can absorb and buffer the impact force of the second end on the main body, reducing the risk of packaging shell damage and improving the safety performance of the electrochemical device.

[0006] In one possible implementation: along the thickness direction of the electrode assembly, the bonding length of the adhesive on the side of the second section away from the first section is L1, and the length of the second section is L2, wherein 0.5mm≤L1≤L2, so as to ensure that the adhesive has sufficient bonding strength while ensuring that the upper end of the adhesive does not exceed the upper end of the sealing part, thereby reducing the impact on energy density and increasing the aesthetics of the battery cell.

[0007] In one possible implementation: the side of the main body has a first arc surface and a second arc surface, the first arc surface connecting the first segment and the second arc surface, the connection point of the first arc surface and the second arc surface being the vertex of the side of the main body, the vertex being the position of the maximum width of the main body; a receiving space is provided between the first arc surface and the first segment, the adhesive part being disposed in the receiving space; the receiving space has an enlarged portion, the width of which, along the width direction of the electrode assembly, is the maximum width of the receiving space, and the projection of the enlarged portion onto the first arc surface does not coincide with the vertex. This avoids the accumulation of the width of the enlarged portion with the maximum width of the electrode assembly, which is beneficial for reducing the overall width of the electrochemical device, making reasonable use of the arc surface area space of the side plate of the main body, and improving energy density.

[0008] In one possible implementation: the second end is located on one side of the second arc surface, and the projection of the second end onto the second arc surface does not coincide with the vertex. This avoids the second segment from stacking with the electrode assembly at its maximum width, further reducing the overall width of the electrochemical device and increasing the energy density.

[0009] In one possible implementation: both the first segment and the second segment are located on one side of the first arc surface, and the projection of the first end onto the first arc surface does not coincide with the vertex. This allows the sealing portion to extend beyond the vertex, with the entire sealing portion situated within the area on the side of the first arc surface, reducing the impact of the sealing portion on the overall width of the electrochemical device and thus improving energy density.

[0010] In one possible implementation: the adhesive has a stacked portion along the width direction of the electrode assembly, the stacked portion being the location of the adhesive's maximum thickness, and the projection of the stacked portion onto the side of the main body portion does not coincide with its vertex. This avoids the maximum thickness of the adhesive and the maximum thickness of the electrode assembly from overlapping and accumulating.

[0011] In one possible implementation: the adhesive part is disposed between the first section and the second section, and a cavity is provided between the second section and the first section. Along the thickness direction of the electrode assembly, the adhesive length of the adhesive part on the side of the second section near the first section is L3, wherein L3≥0.2mm, to ensure that the adhesive part can fully wrap the second end and reduce the possibility of the second end cracking or puncturing the packaging shell.

[0012] In one possible implementation: along the thickness direction of the electrode assembly, the length of the second segment is L2, and the bonding length of the adhesive on the side of the second segment close to the first segment is L3, where L2-L3≥0.3mm, so that a cavity is formed between the upper end of the second segment and the upper end of the first segment, which can play a buffering role.

[0013] In one possible implementation: a receiving space is provided between the first section, the second end, and the side of the main body. Along the thickness direction of the electrode assembly, the length of the adhesive in the receiving space is L4, and the length of the receiving space is L5, where L4 ≤ L5. When L4 is less than L5, a space can also be formed at the bottom of the receiving space to act as a buffer. When L4 equals L5, the receiving space can be filled by the adhesive, which helps to improve the impact resistance of the sealing part.

[0014] In one possible implementation: L5-L4 ≥ 0.2 mm.

[0015] In one possible implementation: along the width direction of the electrode assembly, between the side of the main body and the second section, the thickness of the adhesive is less than the thickness of the second section, and the thickness of the adhesive is less than or equal to 90 micrometers, ensuring that the adhesive can fully include the second end while reducing the impact of the adhesive on the overall size of the electrochemical device.

[0016] In one possible implementation: the main body further includes a first plane, a second plane, and a third arc surface, the first plane and the second plane are disposed opposite to each other, the first plane is connected to the side, the second plane is connected to the third arc surface, and the side and the third arc surface are connected together to the first section.

[0017] Furthermore, a gap is formed between the third arc surface and the electrode assembly, which serves to buffer the impact force received by the electrochemical device. The third arc surface not only creates a buffer space between the packaging shell and the electrode assembly, but also improves the appearance of the packaging shell and reduces stress concentration issues during right-angle connections.

[0018] In one possible implementation: along the thickness direction of the electrode assembly, the distance between the connection point of the third arc surface and the first segment and the second plane is F, where F < 0.1 mm.

[0019] Embodiments of this application also provide an electronic device, including an electrical component and the electrochemical device described in the above embodiments, wherein the electrical component is electrically connected to the electrochemical device. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a cross-sectional structural schematic diagram of an electrochemical device according to an embodiment of this application.

[0022] Figure 2 This is a cross-sectional structural schematic diagram of the electrochemical device in another embodiment.

[0023] Figure 3 This is a cross-sectional structural schematic diagram of the electrochemical device in another embodiment.

[0024] Figure 4 This is a cross-sectional structural schematic diagram of the electrochemical device in another embodiment.

[0025] Figure 5 This is a cross-sectional structural schematic diagram of the electrochemical device in another embodiment.

[0026] Figure 6 This is a simplified structural diagram of an electronic device in one embodiment.

[0027] Explanation of key component symbols:

[0028] Electrochemical device 100

[0029] Electrode assembly 10

[0030] Packaging shell 20

[0031] Main body 21

[0032] First arc surface 211

[0033] Second arc surface 212

[0034] Vertex P

[0035] First plane 213

[0036] Second plane 214

[0037] Third arc surface 215

[0038] Edge banding 22

[0039] Section 1, 23

[0040] Section 24

[0041] First end 241

[0042] Second end 242

[0043] Adhesive component 30

[0044] Accumulation Section 31

[0045] Containment space 40

[0046] Enlargement 41

[0047] Gap space 50

[0048] Electronic equipment 200

[0049] Electrical components 201 Detailed Implementation

[0050] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0051] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. When a component is said to be "set on" another component, it can be directly set on the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0052] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "or / and" as used herein includes any and all combinations of one or more of the associated listed items.

[0053] Some embodiments of this application are described in detail. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0054] See Figure 1This embodiment provides an electrochemical device 100, including an electrode assembly 10, a packaging shell 20, and an adhesive 30. The packaging shell 20 includes a main body 21 and a sealing portion 22. The electrode assembly 10 is disposed inside the main body 21, and the sealing portion 22 is located on the side of the main body 21. The sealing portion 22 includes a first section 23 and a second section 24 that are folded together. The second section 24 has a first end 241 and a second end 242. The first section 23 connects the main body 21 and the first end 241, and the second end 242 is disposed between the first section 23 and the side of the main body 21. The adhesive 30 is adhered between the side of the main body 21 and the second section 24. The second section 24 is connected to the adhesive 30. Along the thickness direction of the electrode assembly 10, the end of the adhesive 30 extends beyond the second end 242 of the second section 24, and the adhesive 30 covers the second end 242. This allows the adhesive 30 to seal the second end 242 while preventing the second end 242 from directly contacting the side of the main body 21. Thus, when the electrochemical device 100 is dropped or impacted, the adhesive 30 can absorb and buffer the impact force of the second end 242 on the main body 21, reducing the risk of damage to the packaging shell 20 and improving the safety performance of the electrochemical device 100.

[0055] Specifically, in the embodiments of this application, during the manufacturing process of the electrochemical device 100, the electrode assembly 10 is first inserted into the packaging shell 20. Then, the sides of the packaging shell 20 are cut and pressed to form the main body 21 and the sealing edge 22 of the packaging shell 20. The electrode assembly 10 is housed in the internal space of the main body 21. Next, the side structure of the cut packaging shell 20 is folded at least twice so that the sealing edge 22 abuts against the side of the main body 21, forming a stacked first section 23 and a second section 24. The bent sealing edge 22 reduces the width of the electrochemical device 100 and improves the sealing performance of the sealing edge 22. Before the second section 24 is attached to the side of the main body 21, the adhesive 30 is first attached to the side of the main body 21. The edge sealing portion 22 is bent toward the main body 21 so that when the second section 24 is attached to the side of the main body 21, the second section 24 can contact the adhesive 30, and the adhesive 30 covers the second end 242 of the second section 24, thereby sealing the cut of the edge sealing portion 22 with the adhesive 30.

[0056] Furthermore, along the thickness direction of the electrode assembly 10, i.e. Figure 1As indicated by arrow A, the bonding length of the adhesive component 30 on the side of the second section 24 away from the first section 23 is L1, and the length of the second section 24 is L2, where 0.5mm ≤ L1 ≤ L2. The fact that both L1 and L2 are not less than 0.5mm ensures sufficient bonding length and area between the adhesive component 30 and the second section 24, thereby giving the adhesive component 30 sufficient bonding strength and preventing spontaneous cracking. The fact that the length of L1 is not less than the length of L2 ensures that the upper end of the adhesive component 30 does not exceed the upper end of the sealing portion 22, reducing the impact on energy density and minimizing adhesive overflow, thus saving adhesive usage.

[0057] like Figure 2 As shown, in one possible implementation, a cavity is provided between the second segment 24 and the first segment 23. The adhesive 30 can also be partially disposed between the first segment 23 and the second segment 24, so that the first segment 23 and the second segment 24 can also be fixed by the adhesive 30, avoiding problems such as bulging and deformation of the sealing part 22 due to its own elastic deformation, and improving the structural compactness of the sealing part 22. Along the thickness direction of the electrode assembly 10, the bonding length of the adhesive 30 on the side of the second segment 24 near the first segment 23 is L3, where L3≥0.2mm, ensuring that the adhesive 30 can fully wrap the second end 242 while fixing the second segment 24 and the first segment 23, reducing the possibility of the second end 242 cracking or puncturing the packaging shell 20.

[0058] Furthermore, along the thickness direction of the electrode assembly 10, the adhesive length of the adhesive 30 on the side of the second section 24 near the first section 23 is L3, the length L2 of the second section 24 is greater than L3, and L2-L3≥0.3mm. Thus, the gap formed between the first section 23 and the second section 24 is only filled by the adhesive 30 at the lower end near the second end 242, creating a cavity between the upper end of the second section 24 near the first end 241 and the upper end of the first section 23. This cavity structure can act as a buffer when the electrochemical device 100 is dropped or impacted, and can also minimize the amount of adhesive 30 used, avoiding the problem of increased overall size of the electrochemical device 100 caused by excessive accumulation of adhesive 30 between the first section 23 and the second section 24.

[0059] Furthermore, a receiving space 40 is provided between the first section 23, the second end 242, and the side of the main body 21. Along the thickness direction of the electrode assembly 10, the length of the adhesive member 30 within the receiving space 40 is L4, and the length of the receiving space 40 is L5, where L4 ≤ L5. Figure 2As shown, when L4 is less than L5, a space can also be formed at the bottom of the receiving space 40. This space acts as an airbag at the bottom of the sealing part 22, providing a cushioning effect and further improving the drop safety of the electrochemical device 100. In one embodiment, L5-L4 ≥ 0.2 mm to ensure that an airbag of sufficient size is formed at the bottom of the receiving space 40, enhancing the cushioning effect.

[0060] In other implementations, such as Figure 3 As shown, when L4 equals L5, the receiving space 40 can be filled by the adhesive 30, which can not only fully wrap the cut end of the edge banding 22, but also improve the mechanical strength of the edge banding 22, thereby improving the impact resistance of the edge banding 22.

[0061] Please refer to it again. Figure 1 , Figure 2 and Figure 3 In one possible implementation, the side of the main body 21 has a first arc surface 211 and a second arc surface 212. The first arc surface 211 connects the first segment 23 and the second arc surface 212, and the connection point between the first arc surface 211 and the second arc surface 212 is the vertex P of the side of the main body 21. This vertex P is the position where the width of the main body 21 is the largest, which is shown as a point in the cross-sectional view of the figure. In the three-dimensional structure of the electrochemical device 100, the most convex position can also be shown as a top edge or a section of top surface. The receiving space 40 between the first segment 23, the second end 242 and the side of the main body 21 is located between the first arc surface 211 and the first segment 23. The receiving space 40 is generally teardrop-shaped and pocket-shaped. Further, the receiving space 40 has an enlarged portion 41. Along the width direction of the electrode assembly 10, the width d of the enlarged portion 41 is the maximum width of the receiving space 40. The projection of the enlarged portion 41 on the first arc surface 211 does not coincide with the vertex P of the side of the main body 21. In this embodiment, the sealing portion 22 extends from the lower side of the main body 21 and is bent, with the enlarged portion 41 of the receiving space 40 located below the vertex P. In other embodiments, the sealing portion 22 may also extend from the lower side of the main body 21 and be bent, with the enlarged portion 41 of the receiving space 40 located above the vertex P. This avoids the accumulation of the width of the enlarged portion 41 with the maximum width of the electrode assembly 10, which helps to reduce the overall width of the electrochemical device 100, make reasonable use of the curved surface area of ​​the side plate of the main body 21, and improve the energy density.

[0062] In another embodiment, the second end 242 of the second segment 24 is located on one side of the second arc surface 212, and the projection of the second end 242 onto the second arc surface 212 does not coincide with the vertex P. Specifically, as Figure 4As shown, along the thickness direction of the electrode assembly 10, when the upper end of the first segment 23 exceeds the vertex P, the length of the second segment 24 can be shortened, so that the second segment 24 is entirely located outside the second arc surface 212, thereby placing the second end 242 of the second segment 24 above the vertex P. Thus, the adhesive 30 can also be disposed outside the second arc surface 212. Both the second segment 24 and the adhesive 30 are arranged in the space outside the second arc surface 212, thereby avoiding the second segment 24 from stacking with the electrode assembly 10 at its maximum width position. The distance between the first segment 23 and the side of the main body 21 is reduced, thereby reducing the overall width of the electrochemical device 100 and increasing the energy density.

[0063] In another embodiment, both the first segment 23 and the second segment 24 are located on one side of the first arc surface 211, and the projection of the first end 241 of the second segment 24 onto the first arc surface 211 does not coincide with the vertex P. Specifically, as shown... Figure 5 As shown, the overall size of the sealing portion 22 is reduced. Along the thickness direction of the electrode assembly 10, the upper end of the sealing portion 22 does not exceed the position of the vertex P, and is preferably located below the vertex P. This ensures that the first segment 23 and the second segment 24 are both located on the side of the first arc surface 211, and neither the first segment 23 nor the second segment 24 is higher than the vertex P. The adhesive 30 can also be bonded to the sealing portion 22 from the outside of the first arc surface 211. In this way, the sealing portion 22 as a whole does not exceed the vertex P, and the entire sealing portion 22 is set in the area on the side of the first arc surface 211. By making reasonable use of the empty area on the outside of the arc surface, the width of the sealing portion 22 can be compressed within the width range between the vertex P and the lower end of the first arc surface 211, reducing the impact of the sealing portion 22 on the overall width of the electrochemical device 100, thereby improving the energy density.

[0064] In one embodiment, the adhesive 30 has a stacked portion 31, the thickness t of which is the maximum thickness of the adhesive 30 along the width direction of the electrode assembly 10. Along the thickness direction of the electrode assembly 10, the stacked portion 31 is spaced apart from the vertex P, thereby preventing the maximum thickness of the adhesive 30 from overlapping with the maximum thickness of the electrode assembly 10. Specifically, as... Figure 1 As shown, the stacked portion 31 of the adhesive 30 is located between the second arc surface 212 and the second segment 24, and above the vertex P, so that the maximum thickness of the adhesive 30 fills the space between the second arc surface 212 and the second segment 24, and does not accumulate between the second segment 24 and the vertex P. This helps to reduce the overall width of the electrochemical device 100 and improves the energy density. Figure 2 or Figure 3In the embodiment shown, the stacked portion 31 of the adhesive 30 is located within the receiving space 40 and below the vertex P, such that the maximum thickness of the adhesive 30 is located between the first arc surface 211 and the first segment 23, and does not stack excessively between the vertex P and the second segment 24, which is beneficial to improving the energy density of the electrochemical device 100.

[0065] In one possible implementation, such as Figures 1 to 5 As shown in any example, along the width direction of the electrode assembly 10, between the side of the main body 21 and the second section 24, the thickness of the adhesive 30 is at least partially less than the thickness of the second section 24, and the thickness of the adhesive 30 is less than or equal to 90 micrometers, ensuring that the adhesive 30 can fully include the second end 242 while reducing the impact of the adhesive 30 on the overall size of the electrochemical device 100.

[0066] In one possible implementation, such as Figures 1 to 5 As shown in any example, the main body 21 also includes a first plane 213, a second plane 214, and a third arc surface 215. The first plane 213 and the second plane 214 are arranged opposite to each other. The first plane 213 is connected to the side, and the second plane 214 is connected to the third arc surface 215. The side and the third arc surface 215 of the main body 21 are connected to the first section 23, so that the connection structure between the lower end of the sealing part 22 and the main body 21 forms an arc structure. Compared with the right angle connection, the arc connection structure is more aesthetically pleasing and can reduce stress concentration, further improving the drop safety of the electrochemical device 100.

[0067] Furthermore, a gap space 50 is formed between the third arc surface 215 and the electrode assembly 10, and the gap space 50 is used to buffer the impact force received by the electrochemical device 100. The gap space 50 can also be filled with electrolyte to further improve the impact resistance of the gap space 50.

[0068] In some embodiments, such as Figure 4 As shown, along the thickness direction of the electrode assembly 10, the distance between the connection point of the third arc surface 215 and the first segment 23 and the second plane 214 is F, where F < 0.1 mm. This reduces the overall height of the sealing portion 22, allowing it to be closer to the bottom surface of the main body 21. This is beneficial for use in thin-cell edge-folding schemes, preventing the sealing portion 22 from protruding from the upper surface of the main body 21 after the edge-folding process, thus avoiding impacting the thickness of the electrochemical device 100. It also facilitates the allocation of space for each part of the sealing portion 22, reducing the overall width of the electrochemical device 100.

[0069] Please see Figure 6Embodiments of this application also provide an electronic device 200, including an electrical component 201 and an electrochemical device 100 as described in any of the above embodiments or combinations thereof. The electrochemical device 100 is electrically connected to the electrical component 201 to provide electrical energy to the electrical component 201.

[0070] The above embodiments are only used to illustrate 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 above preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions to the technical solutions of this application should not depart from the spirit and scope of the technical solutions of this application.

Claims

1. An electrochemical device, characterized in that, include: Electrode assembly; The packaging shell includes a main body and a sealing edge. The electrode assembly is disposed inside the main body. The sealing edge is located on the side of the main body. The sealing edge includes a first section and a second section that are folded together. The second section has a first end and a second end. The first section connects the main body and the first end. The second end is disposed between the first section and the side of the main body. An adhesive is attached between the side of the main body and the second section, the second section is connected to the adhesive, and along the thickness direction of the electrode assembly, the end of the adhesive extends beyond the second end and covers the second end; the adhesive is partially disposed between the first section and the second section, and a cavity is provided between the second section and the first section; A receiving space is provided between the first section, the second end and the side of the main body. Along the thickness direction of the electrode assembly, the length of the adhesive in the receiving space is L4 and the length of the receiving space is L5, where L4 < L5. The side of the main body has a first arc surface and a second arc surface. The first arc surface connects the first section and the second arc surface. The connection point between the first arc surface and the second arc surface is the vertex of the side of the main body. The vertex is the position of the maximum width of the main body. The receiving space has an enlarged portion. Along the width direction of the electrode assembly, the width of the enlarged portion is the maximum width of the receiving space. The projection of the enlarged portion onto the first arc surface does not coincide with the vertex.

2. The electrochemical device according to claim 1, characterized in that: The second end is located on one side of the second arc surface, and the projection of the second end onto the second arc surface does not coincide with the vertex.

3. The electrochemical device according to claim 1, characterized in that: Both the first segment and the second segment are located on one side of the first arc surface, and the projection of the first end onto the first arc surface does not coincide with the vertex.

4. The electrochemical device according to claim 1, characterized in that: The adhesive has an accumulation portion along the width direction of the electrode assembly, the accumulation portion being the position of maximum thickness of the adhesive, and the projection of the accumulation portion onto the side of the main body portion does not coincide with the vertex.

5. The electrochemical device according to any one of claims 1-4, characterized in that: Along the thickness direction of the electrode assembly, the bonding length of the adhesive on the side of the second section away from the first section is L1, and the length of the second section is L2, wherein 0.5mm≤L1≤L2.

6. The electrochemical device according to any one of claims 1-4, characterized in that: Along the thickness direction of the electrode assembly, the bonding length of the adhesive in the second section near the first section is L3, wherein L3 ≥ 0.2 mm.

7. The electrochemical device according to claim 6, characterized in that: Along the thickness direction of the electrode assembly, the length of the second segment is L2, and L2-L3≥0.3mm.

8. The electrochemical device according to claim 1, characterized in that: L5-L4≥0.2mm.

9. The electrochemical device according to any one of claims 1-4, characterized in that: Along the width direction of the electrode assembly, between the side of the main body and the second section, the thickness of the adhesive is less than the thickness of the second section, and the thickness of the adhesive is less than or equal to 90 micrometers.

10. The electrochemical device according to any one of claims 1-4, characterized in that: The main body also includes a first plane, a second plane, and a third arc surface. The first plane and the second plane are arranged opposite to each other. The first plane is connected to the side, the second plane is connected to the third arc surface, and the side and the third arc surface are connected to the first section.

11. The electrochemical device according to claim 10, characterized in that: A gap space is formed between the third arc surface and the electrode assembly.

12. The electrochemical device according to claim 10, characterized in that: Along the thickness direction of the electrode assembly, the distance between the connection point of the third arc surface and the first segment and the second plane is F, where F < 0.1 mm.

13. An electronic device, characterized in that, It includes an electrical component and the electrochemical device according to any one of claims 1-12, wherein the electrical component is electrically connected to the electrochemical device.

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