Electrochemical device and electronic device using the same

Abstract

An electrochemical device and an electronic device using the same. The electrochemical device includes an electrode assembly and a shell, in which an electrolyte is disposed. The electrode assembly includes a main body, a metal part, and a buffer. The main body is accommodated in the shell; the metal part is connected to the main body and extends outward from the main body, and the metal part includes a first metal part; the buffer includes a first area and a second area, the first area is connected to the first metal part, and the second area is connected to the first area and is extended on at least one side of the metal part. When the electrochemical device falls, the buffer can reduce and absorb the impact of the electrolyte, thereby reducing the impact of the electrolyte on the shell, reducing the risk of shell damage and leakage, and improving the reliability of the electrochemical device.

Description

Technical Field

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

[0002] Soft-packaged batteries have the advantages of light weight, flexible shape, and high energy density. As the soft-packaged battery process matures, it is widely used in consumer electronics, electric vehicles, power tools and other fields. Soft-packaged batteries generally use a shell to wrap the electrode assembly and electrolyte, and the shell is sealed to form a sealing area to complete the seal. However, during the use, testing or transportation of the battery, there is a risk of battery failure due to falling. When the battery falls, the electrolyte inside the shell may impact the shell in the direction of the fall. The impact on the edge of the shell will destroy the sealing of the battery, and there is a risk of cracking and leakage. Summary of the invention

[0003] In order to solve the problems in the prior art, the present application provides an electrochemical device with high safety and reliability.

[0004] The embodiment of the present application provides an electrochemical device, which includes an electrode assembly and a shell, wherein an electrolyte is disposed in the shell. The electrode assembly includes a main body, a metal part, and a buffer. The main body is accommodated in the shell; the metal part is connected to the main body and extends outward from the main body, and the metal part includes a first metal part; the buffer includes a first region and a second region, wherein the first region is connected to the first metal part, and the second region is connected to the first region and is extended on at least one side of the metal part.

[0005] When an electrochemical device falls, part of the electrolyte cannot flow in time, so when the electrochemical device falls and stops moving, part of the electrolyte forms a rigid impact on the shell. The buffer can reduce the risk of shell damage and leakage by slowing down and absorbing the impact of the electrolyte on the shell, thereby improving the safety and reliability of the electrochemical device.

[0006] In a possible implementation manner, compared with the first region, the second region is disposed farther away from the metal portion.

[0007] In a possible implementation manner, the second region includes a first end and a second end that are oppositely disposed, the first end is connected to the first region, and compared to the first end, the second end is disposed farther away from the metal portion.

[0008] In a possible implementation, the metal portion further includes a second metal portion, the first metal portion and the second metal portion are disposed on the same side of the main body, and the first region is also connected to the second metal portion. Furthermore, the first region is connected to the first metal portion and the second metal portion at the same time, which can improve the fixing strength of the buffer inside the electrochemical device, improve the bearing strength of the buffer when it withstands the impact of the electrolyte, reduce the risk of the shell being broken by the electrolyte, and thus improve the reliability of the electrochemical device.

[0009] In a possible implementation, when viewed along the thickness direction of the first metal portion, the second region overlaps with at least a portion of the first metal portion, and the second region overlaps with at least a portion of the second metal portion.

[0010] In a possible embodiment, when viewed along the thickness direction of the first metal portion, at least a portion of the second end portion overlaps with the main portion, and at least a portion of the second end portion is disposed between the main portion and the shell. Further, when the buffer is subjected to an impact from the electrolyte, the impact direction of the electrolyte is from the main portion toward the side of the shell where the buffer is disposed, and at least a portion of the impact of the electrolyte can be absorbed by the movement of the second region away from the main portion, thereby improving the reliability of the electrochemical device.

[0011] In a possible implementation manner, in the width direction of the first metal part, the second region is extended along the width direction of the first metal part.

[0012] In a possible embodiment, the buffer component includes at least two buffer units, each buffer unit includes an adhesive layer and a substrate layer, the adhesive layer is arranged on the surface of the substrate layer, at least two buffer units are fixed to the metal part through the adhesive layer, the adhesive layer is arranged in the first area, and the substrate layer is arranged in the first area and the second area.

[0013] In a possible embodiment, the metal part further includes a second metal part, the adhesive layer bonds the first metal part and the second metal part, and the adhesive layers of at least two buffer units are bonded to each other at portions located between the first metal part and the second metal part. Furthermore, the portions of the two buffer units located between the first metal part and the second metal part are bonded to each other, which can reduce the risk of the electrolyte passing through the gap between the two buffer units and directly impacting the shell during the drop of the electrochemical device, thereby reducing the risk of shell damage and leakage, and improving the reliability of the electrochemical device.

[0014] In a possible implementation manner, the adhesive layers of at least two buffer units are respectively disposed on two opposite sides of the metal portion.

[0015] In a possible implementation, the buffer further includes a third region, the third region is connected to the first metal portion and the second metal portion, and the second region is disposed separately from the third region.

[0016] In a possible embodiment, the electrochemical device further includes a wiring assembly, the wiring assembly includes at least one wiring unit connected to the main body, one end of the at least one wiring unit is respectively connected to the main body, the other end of the at least one wiring unit is connected to the first metal part through a weld print, and the third area covers the weld print. Further, the third area can cover the weld print to reduce the risk of short circuit of the electrochemical device, thereby improving the safety of the electrochemical device, and can replace the protective structure covering the weld print, reduce the process flow and reduce the manufacturing cost.

[0017] In a possible embodiment, the metal part extends to the outside of the shell, the connection between the metal part and the shell is sealed by a seal, and the buffer is arranged between the main body and the seal. Furthermore, the shell is sealed by the seal, and compared with other areas of the shell, the seal and the sealing area are more likely to be broken by the impact from the electrolyte and cause leakage. By arranging the buffer between the main body and the seal, the impact of the electrolyte on the seal and the sealing area when the electrochemical device falls can be reduced, so as to improve the reliability of the electrochemical device.

[0018] The present application also provides an electronic device, which includes the aforementioned electrochemical device.

[0019] Compared with the prior art, in the electrochemical device of the present application, when the electrochemical device falls, part of the electrolyte cannot flow in time, so when the electrochemical device falls and stops moving, part of the electrolyte forms a rigid impact on the shell. The buffer can mitigate the impact of the electrolyte on the shell by mitigating and absorbing the impact of the electrolyte, reducing the risk of shell damage and leakage, thereby improving the reliability of the electrochemical device. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 FIG. 1 is a schematic diagram of an electrochemical device according to an embodiment of the present application.

[0021] Figure 2 It is a partial side view schematic diagram of an electrode assembly of an electrochemical device according to an embodiment of the present application.

[0022] Figure 3 FIG. 1 is a schematic top view of an electrochemical device according to an embodiment of the present application.

[0023] Figure 4 Schematic diagram of the structure of a buffer member according to an embodiment of the present application.

[0024] Figure 5 Schematic diagram of the structure of a buffer member according to an embodiment of the present application.

[0025] Figure 6 FIG. 1 is a schematic diagram of an electrode assembly of an electrochemical device according to another embodiment of the present application.

[0026] Figure 7 It is a partial side view schematic diagram of an electrode assembly of an electrochemical device according to another embodiment of the present application.

[0027] Figure 8 It is a partial side view schematic diagram of an electrode assembly of an electrochemical device according to another embodiment of the present application.

[0028] Fig. 9 This is a schematic structural diagram of a buffer component according to another embodiment of the present application.

[0029] Fig.10 This is a schematic diagram of an electrode assembly of an electrochemical device according to another embodiment of the present application.

[0030] Fig.11 FIG. 1 is a partial side view of an electrode assembly of an electrochemical device according to another embodiment of the present application.

[0031] Fig.12 FIG. 1 is a schematic top view of an electrode assembly of an electrochemical device according to another embodiment of the present application.

[0032] Fig.13 FIG. 1 is a schematic diagram of an electronic device according to an embodiment of the present application.

[0033] Main component symbols

[0034] Electrochemical device 1

[0035] Electrode assembly 10

[0036] Main body 11

[0037] Metal Section 12

[0038] The first metal portion 121

[0039] The second metal portion 122

[0040] First Area 131

[0041] Second area 132

[0042] First end 1321

[0043] Second end 1322

[0044] Third Area 133

[0045] First dividing line 134

[0046] Buffer unit 135

[0047] Adhesive layer 136

[0048] Base material layer 137

[0049] Seal 14

[0050] Protective layer 15

[0051] Wiring assembly 16

[0052] Wiring unit 160

[0053] Welding stamp 163

[0054] Electrolyte 18

[0055] Housing 19

[0056] Sealed Area 190

[0057] Electronic device 100

[0058] Load 120

[0059] First direction X

[0060] Second direction Y

[0061] The third direction Z

[0062] The following specific implementation methods will further illustrate the present application in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0063] The following description will refer to the accompanying drawings to more fully describe the content of the present application. Shown in the accompanying drawings are exemplary embodiments of the present application. However, the present application can be implemented in many different forms and should not be construed as being limited to the exemplary embodiments set forth herein. These exemplary embodiments are provided to make the present application thorough and complete, and to fully convey the scope of the present application to those skilled in the art. Similar reference numerals represent identical or similar components.

[0064] The terms used herein are only used for the purpose of describing specific exemplary embodiments and are not intended to limit the present application. As used herein, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to also include the plural forms. In addition, when used herein, "including" and / or "comprising" and / or "having", integers, steps, operations, components and / or components, but do not exclude the existence or addition of one or more other features, regions, integers, steps, operations, components, components and / or groups thereof.

[0065] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by those of ordinary skill in the art to which this application belongs. In addition, unless explicitly defined herein, terms such as those defined in general dictionaries should be interpreted as having a meaning consistent with their meaning in the relevant technology and the content of this application, and will not be interpreted as an idealized or overly formal meaning.

[0066] The following will describe exemplary embodiments in conjunction with the accompanying drawings. It should be noted that the components depicted in the reference drawings are not necessarily shown to scale; and the same or similar components will be given the same or similar reference numerals or similar technical terms.

[0067] The specific implementation methods of the present application are further described in detail below with reference to the accompanying drawings.

[0068] like Figures 1 to 3 As shown, an embodiment of the present application provides an electrochemical device 1 , including an electrode assembly 10 and a shell 19 , wherein an electrolyte 18 is disposed in the shell 19 , and the electrolyte 18 infiltrates at least a portion of the electrode assembly 10 .

[0069] The electrode assembly 10 includes a main body 11, a metal part 12, and a buffer 13. The main body 11 is received in a shell 19, the metal part 12 is connected to the main body 11 and extends out of the main body 11, and the buffer 13 is received in the shell 19 and connected to the metal part 12, so as to mitigate or absorb the impact of the electrolyte 18 on the shell 19 when the electrochemical device 1 falls.

[0070] In some embodiments, part of the electrolyte 18 infiltrates the main body 11 , and part of the electrolyte 18 forms free electrolyte that adheres to the surface of the shell 19 or the main body 11 .

[0071] The metal part 12 includes a first metal part 121 , and the buffer 13 includes a first region 131 and a second region 132 . The first region 131 is connected to the first metal part 121 , and the second region 132 is connected to the first region 131 and extends on at least one side of the metal part 12 .

[0072] In some embodiments, compared with the first region 131 , the second region 132 is disposed away from the metal portion 12 . That is, the second region 132 extends in a direction away from the metal portion 12 , and may further extend to both sides of the metal portion 12 .

[0073] In some embodiments, the second region 132 includes a first end 1321 and a second end 1322 that are oppositely disposed, the first end 1321 is connected to the first region 131 , and compared to the first end 1321 , the second end 1322 is disposed farther away from the metal portion 12 .

[0074] Furthermore, when the electrochemical device 1 falls (especially when it falls downward along the extension direction of the metal part 12, "downward" can be understood as the direction of movement of the electrochemical device 1 during the fall, or the opposite direction of the force that prevents the movement of the electrochemical device 1 when it stops moving), part of the electrolyte 18 cannot flow in time, so when the electrochemical device 1 falls and stops moving, part of the electrolyte 18 forms a rigid impact on the shell 19. The buffer 13 can block and absorb the impact of the electrolyte 18, thereby slowing down or preventing the impact of the electrolyte 18 on the shell 19, thereby improving the reliability of the electrochemical device 1.

[0075] The metal part 12 extends to the outside of the housing 19 , and the connection between the metal part 12 and the housing 19 can be sealed by a seal 14 . In one embodiment, the buffer 13 is disposed between the main body 11 and the seal 14 .

[0076] In one embodiment, the shell 19 may be a multi-layer composite structure, and the shell 19 may include a nylon layer, an aluminum-plastic layer, and a hot-melt layer stacked in sequence. The shell 19 accommodates the electrode assembly 10 and is sealed after being filled with the electrolyte 18. The edges of the shell 19 may be combined to complete the sealing of the shell 19. The combined area is a sealing area 190 of the shell 19. The sealing member 14 is arranged on the outside of the shell 19 and covers at least part of the sealing area 190. In this embodiment, the sealing member 14 may be a hot-melt adhesive or other viscous colloid, and the sealing member 14 is at least arranged at the end of the metal part 12 extending out of the shell 19.

[0077] Furthermore, the housing 19 is sealed by the seal 14. Compared with other areas of the housing 19, the seal 14 and the sealing area 190 are more likely to be broken by the impact from the electrolyte 18 and cause leakage. In this embodiment, by arranging the buffer 13 between the main body 11 and the seal 14, the impact of the electrolyte 18 on the seal 14 and the sealing area 190 when the electrochemical device 1 falls can be mitigated or avoided, thereby improving the reliability of the electrochemical device 1.

[0078] In this embodiment, the metal part 12 further includes a second metal part 122, the first metal part 121 and the second metal part 122 are arranged on the same side of the main body 11, and the first region 131 is also connected to the second metal part 122. The first region 131 simultaneously connects the first metal part 121 and the second metal part 122 that are arranged at intervals, or one end of the first region 131 is connected to the first metal part 121 and extends toward the second metal part 122 until the other end of the first region 131 is connected to the second metal part 122, so that the area between the first metal part 121 and the second metal part 122 is provided with the first region 131, and at least a portion of the second region 132 connected to the first region 131 may correspond to the area between the first metal part 121 and the second metal part 122.

[0079] Furthermore, the first region 131 simultaneously connects the first metal part 121 and the second metal part 122, which can improve the fixing strength of the buffer 13 inside the electrochemical device 1, improve the bearing strength of the buffer 13 when it is impacted by the electrolyte 18, reduce or eliminate the risk of the seal 14 and the sealing area 190 being broken by the electrolyte 18, and thus improve the reliability of the electrochemical device 1. Moreover, in this structure, the area of ​​the shell 19 between the first metal part 121 and the second metal part 122 is more easily broken than other areas of the shell 19. The first region 131 connecting the first metal part 121 and the second metal part 122 can reduce the possibility of leakage of the shell 19 and improve the safety of the electrochemical device 1.

[0080] Observed along the thickness direction (first direction X) of the first metal part 121, the second region 132 overlaps with at least a portion of the first metal part 121, and the second region 132 overlaps with at least a portion of the second metal part 122. In the present embodiment, the first region 131 is connected to the first metal part 121 and extends toward the second metal part 122 until it is connected to the second metal part 122. Correspondingly, at least a portion of the second region 132 connected to the first region 131 is disposed between the first metal part 121 and the second metal part 122, and further, the projections of the two ends of the second region 132 in the first direction X can cover the first metal part 121 and the second metal part 122, respectively.

[0081] In one embodiment, the first direction X may be a thickness direction of the main body 11 .

[0082] Furthermore, the first region 131 can be used to fix the metal part 12 and the buffer 13, and the second region 132 can be used to extend to both sides of the metal part 12 to expand the area of ​​the buffer 13 blocking the impact of the electrolyte 18, thereby improving the effectiveness of the buffer 13 in mitigating the impact of the electrolyte 18, thereby improving the reliability of the electrochemical device 1.

[0083] like Figure 2 , at least a portion of the second end portion 1322 is disposed between the main body portion 11 and the shell 19, and when viewed along the thickness direction of the first metal portion 121, at least a portion of the second end portion 1322 overlaps with the main body portion 11. That is, the second region 132 can be disposed in a wedge-like or "V"-shaped shape, with the opening of the wedge facing the main body portion 11. Further, when the buffer 13 is subjected to an impact from the electrolyte 18, the impact direction of the electrolyte 18 is from the main body portion 11 toward the side of the shell 19 where the buffer 13 is disposed, and at least a portion of the impact of the electrolyte 18 can be absorbed by the movement of the second region 132 in a direction away from the main body portion 11 (the second direction Y, i.e., the extension direction of the metal portion 12).

[0084] When the second region 132 extends toward the main body 11 , it can extend to both side surfaces of the electrode assembly 10 in the thickness direction, so that the orthographic projection of the second region 132 in the first direction X covers at least a portion of the orthographic projection of the electrode assembly 10 close to the buffer 13 .

[0085] Furthermore, by extending and increasing the extension length or area of ​​the second region 132 inside the electrochemical device 1 , the contact area between the second region 132 and the electrolyte 18 can be increased, further enhancing the ability of the buffer 13 to absorb impact from the electrolyte 18 , thereby improving the reliability of the electrochemical device 1 .

[0086] In one embodiment, in the width direction (third direction Z) of the first metal portion 121 , the second region 132 is extended along the width direction of the first metal portion 121 .

[0087] Combination Figure 2 , Figure 4 and Figure 5 The buffer 13 includes at least two buffer units 135, each buffer unit 135 includes an adhesive layer 136 and a substrate layer 137, the adhesive layer 136 is disposed on the surface of the substrate layer 137, and the at least two buffer units 135 are fixed to the metal part 12 through the adhesive layer 136, the adhesive layer 136 is disposed in the first area 131, and the substrate layer 137 is disposed in the first area 131 and the second area 132. The adhesive layer 136 can be disposed in the first area 131, and the substrate layer 137 is disposed in the first area 131 and the second area 132.

[0088] In one embodiment, the adhesive layers 136 of at least two buffer units 135 are respectively disposed on two opposite sides of the metal portion 12 .

[0089] In one embodiment, the adhesive layer 136 bonds the first metal portion 121 and the second metal portion 122 , and portions of the adhesive layer 136 of at least two buffer units 135 located between the first metal portion 121 and the second metal portion 122 are bonded.

[0090] Furthermore, the portions of the two buffer units 135 located between the first metal portion 121 and the second metal portion 122 are bonded to each other, which can reduce the risk of the electrolyte 18 passing through the gap between the two buffer units 135 and directly impacting the shell 19 during the falling process of the electrochemical device 1, thereby reducing the risk of damage and leakage of the shell 19, thereby improving the reliability of the electrochemical device 1.

[0091] In one embodiment, the adhesive layer 136 may be an insulating material with stickiness, such as double-sided adhesive, foam adhesive, water adhesive, etc., so that the buffer unit 135 can be bonded to the metal part 12. The substrate layer 137 may be an insulating substrate, and the material of the substrate layer 137 may be a hard material such as polyimide, so that the substrate layer 137 can withstand and absorb the impact from the electrolyte 18 and is not easily broken due to the impact, thereby improving the service life of the buffer 13. The material of the substrate layer 137 may further have elasticity, so that the buffer 13 can withstand the impact of the electrolyte 18 multiple times, thereby improving the service life of the electrochemical device 1 and the reliability within the expected service life.

[0092] like Figures 6 to 9 As shown, another embodiment of the present application is Figures 1 to 5 The difference between the illustrated embodiments is that the buffer 13 also includes a third region 133 extending from the first region 131 to the main body 11, the third region 133 is connected to the first metal part 121 and the second metal part 122, the second region 132 and the third region 133 are detachably arranged, the second region 132 and the third region 133 can be separated by a first dividing line 134, and the first dividing line 134 can overlap with the boundary of the second region 132 or the third region 133; along the second direction Y, the length of the second region 132 can be greater than the length of the third region 133.

[0093] In one embodiment, the number of the third regions 133 is two, and the two third regions 133 extend from two ends of the first region 131 to the same side of the first region 131, respectively, and the second region 132 and the third region 133 are disposed on the same side of the first region 131. In this embodiment, the third region 133 is disposed on a side of the first region 131 close to the main body 11.

[0094] Furthermore, the electrochemical device 1 also includes a wiring assembly 16, which includes at least one wiring unit 160 connected to the main body 11, one end of at least one wiring unit 160 is respectively connected to the main body 11, and the other end of at least one wiring unit 160 forms a weld mark 163 with the first metal part 121, and the third area 133 covers the weld mark 163.

[0095] In one embodiment, the number of metal parts 12 of the electrochemical device 1 is multiple, and the multiple metal parts 12 are electrically connected to the main body 11 through the wiring assembly 16, and a wiring unit 160 can be a metal sheet with conductive properties. The wiring unit 160 can be connected to the metal part 12 through a welding mark 163, and the welding area of ​​the wiring unit 160 and the metal part 12 is formed with a welding mark 163. The wiring unit 160 contacts and welds at least part of the first metal part 121 to form the welding mark 163. The welding mark 163 is located at the contact part of the wiring unit 160 and the first metal part 121. The welding mark 163 fixes and electrically connects the wiring unit 160 and the first metal part 121. There may be burrs and other structures at the welding mark 163, which may pierce the isolation membrane and cause a short circuit in the electrochemical device 1.

[0096] In one embodiment, if Figure 7 As shown, the electrochemical device 1 further includes a protective layer 15, the number of which may be multiple, and a protective layer 15 is provided on at least one of the two sides of the weld mark 163 or at least one of the two opposite sides along the first direction X, and the protective layer 15 may cover the burrs of the weld mark 163 and other structures that may damage the isolation membrane to protect the electrochemical device 1. In this embodiment, the buffer 13 may be connected to the first metal portion 121 through the protective layer 15, and part of the buffer 13 may also be directly connected to the surface of the first metal portion 121.

[0097] In one embodiment, if Figure 8 As shown, the protective layer 15 can be omitted in the electrochemical device 1, and the third region 133 can be directly connected to the first metal portion 121 and the second metal portion 122. The third region 133 can further be connected to the wiring unit 160 and cover the welding mark 163 to prevent a short circuit in the electrochemical device 1. On the one hand, the safety of the electrochemical device 1 can be improved, and on the other hand, the original protective layer 15 can be replaced to further simplify the structure.

[0098] like Figures 10 to 12 As shown, it is another embodiment of the present application, which is Figures 1 to 5 The difference between the illustrated embodiment is that the first metal portion 121 and the second metal portion 122 extend outwards from two opposite sides of the main body 11 , respectively, and a buffer 13 is disposed on each of the first metal portion 121 and the second metal portion 122 .

[0099] In one embodiment, at least one buffer 13 is disposed on each of the first metal portion 121 and the second metal portion 122 . The buffer 13 is connected to the first metal portion 121 or the second metal portion 122 and extends toward both sides along the width direction of the main body 11 .

[0100] Furthermore, a buffer 13 is disposed on both the first metal portion 121 and the second metal portion 122 , so that when the electrochemical device 1 falls in multiple directions, the buffer 13 can mitigate or block the impact of the electrolyte 18 on the housing 19 in multiple directions, thereby improving the reliability of the electrochemical device 1 .

[0101] like Fig.13 As shown, an electronic device 100 is provided as an embodiment of the present application, and the electronic device 100 includes an electrochemical device 1 and a load 120, and the electrochemical device 1 is used to supply power to the load 120. The electronic device 100 of the present application is not particularly limited, and it can be any electronic device known in the prior art.

[0102] In some embodiments, the electronic device 100 may include, but is not limited to, laptop computers, pen-type computers, mobile computers, e-book players, portable communication equipment, portable copiers, portable printers, backup power supplies, motors, automobiles, motorcycles, electric bicycles, lighting fixtures, toys, power tools, large household batteries and lithium-ion capacitors, etc.

[0103] In the above, the specific embodiments of the present application are described with reference to the accompanying drawings. However, those skilled in the art will appreciate that various changes and substitutions may be made to the specific embodiments of the present application without departing from the scope of the present application. These changes and substitutions are all within the scope defined by the present application.

Claims

1. An electrochemical device, comprising an electrode assembly and a housing, wherein an electrolyte is provided in the housing, wherein: The electrode assembly comprises: A main body, housed in the shell; a metal portion connected to the main body portion and extending outside the main body portion, the metal portion comprising a first metal portion; and The buffer comprises a first region and a second region, wherein the first region is bonded to the first metal part, the second region is connected to the first region and is extended on at least one side of the metal part, the portion of the second region extending out of the main body is arranged between the shell and the main body, the portion of the second region extending out of the main body is separated from the main body, and the second region can move in a direction away from the main body.

2. The electrochemical device according to claim 1, wherein Compared with the first region, the second region is disposed farther away from the metal portion.

3. The electrochemical device according to claim 1, wherein The second region includes a first end and a second end that are oppositely disposed, the first end is connected to the first region, and compared to the first end, the second end is disposed farther away from the metal portion.

4. The electrochemical device according to claim 1, wherein The metal part further includes a second metal part. The first metal part and the second metal part are arranged on the same side of the main body part. The first region is also connected to the second metal part.

5. The electrochemical device according to claim 4, wherein: When viewed in a thickness direction of the first metal portion, the second region overlaps with at least a portion of the first metal portion, and the second region overlaps with at least a portion of the second metal portion.

6. The electrochemical device according to claim 3, wherein: At least a portion of the second end portion is disposed between the main body portion and the housing, and when viewed along a thickness direction of the first metal portion, at least a portion of the second end portion overlaps with the main body portion.

7. The electrochemical device according to claim 1, wherein In a width direction of the first metal portion, the second region is extended along the width direction of the first metal portion.

8. The electrochemical device according to claim 1, wherein The buffer component includes at least two buffer units, each of which includes an adhesive layer and a substrate layer, the adhesive layer is arranged on the surface of the substrate layer, at least two of the buffer units are fixed to the metal part through the adhesive layer, the adhesive layer is arranged in the first area, and the substrate layer is arranged in the first area and the second area.

9. The electrochemical device according to claim 8, wherein: The metal part further includes a second metal part, the bonding layer bonds the first metal part and the second metal part, and portions of the bonding layer of at least two buffer units located between the first metal part and the second metal part are bonded.

10. The electrochemical device according to claim 9, wherein The bonding layers of at least two of the buffer units are respectively arranged on two opposite sides of the metal portion.

11. The electrochemical device according to claim 4, wherein: The buffer member further includes a third region connected to the first metal portion and the second metal portion, and the second region is disposed separately from the third region.

12. The electrochemical device according to claim 11, wherein The electrochemical device also includes a wiring assembly, which includes at least one wiring unit connected to the main body, one end of the at least one wiring unit is respectively connected to the main body, and the other end of the at least one wiring unit is connected to the first metal part through a weld, and the third area covers the weld.

13. The electrochemical device according to claim 1, wherein The metal part extends to the outside of the shell, the connection between the metal part and the shell is sealed by a sealing member, and the buffer member is arranged between the main body and the sealing member.

14. An electronic device, wherein: The electronic device comprises the electrochemical device according to any one of claims 1 to 13.

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