Electrochemical device and electric apparatus

Abstract

The application discloses an electrochemical device and an electric device. The electrochemical device comprises a shell, an electrode assembly and a bonding assembly. The shell comprises a first side wall. The electrode assembly is arranged in the shell and comprises a first side surface adjacent to the first side wall. The first side surface comprises a second region, a first region and a third region arranged in sequence along a first direction. The bonding assembly is located between the shell and the electrode assembly. The bonding assembly comprises opposite first and second surfaces. The first surface comprises a first bonding area bonded to the first side wall. The second surface comprises a second bonding area bonded to the second region, a third bonding area bonded to the third region and a first non-bonding area located between the second bonding area and the third bonding area. In a second direction opposite to the first side wall and the first side surface, a projection of the first bonding area overlaps the first non-bonding area. By canceling the bonding between the bonding assembly and the first region, the risk of damage to the electrode assembly is reduced.

Description

[0001] Cross-reference to related applications This application is a divisional application of application number 202380032607.5, filed on December 1, 2023, entitled "Electrochemical Device and Electrical Equipment". Technical Field

[0002] This application relates to the field of energy storage technology, and in particular to an electrochemical device and an electrical appliance. Background Technology

[0003] To mitigate the risks of internal short circuits and top seal breaches caused by the movement of internal electrode components during drops in electrochemical devices such as lithium-ion batteries, double-sided adhesive tape is typically used to connect the internal electrode components to the casing. This helps to suppress the movement of the electrode components, thereby reducing the risk of failure during drops and improving the safety of the electrochemical device. Summary of the Invention

[0004] However, the inventors of this application have discovered that the existing structure of bonding the electrode assembly to the housing with double-sided adhesive tape, although it can suppress the movement of the electrode assembly when the electrochemical device is dropped, poses a risk of tearing the foil on the outer ring of the electrode assembly, causing an internal short circuit.

[0005] In view of this, this application provides an electrochemical device designed to reduce the risk of tearing of the outer electrode plate of the electrode assembly during a drop, thereby improving the safety of the electrochemical device.

[0006] In a first aspect, this application provides an electrochemical device, comprising a housing, an electrode assembly, and an adhesive assembly. The housing includes a first sidewall, and the electrode assembly is disposed within the housing. The electrode assembly includes a first sidewall adjacent to the first sidewall, and the first sidewall includes a first region, a second region, and a third region. Along a first direction, the first region is located between the second and third regions. The adhesive assembly is located between the housing and the electrode assembly, and includes opposing first and second surfaces. The first surface is adjacent to the housing, and the second surface faces away from the housing. The first surface includes a first adhesive region bonded to the first sidewall; the second surface includes a second adhesive region bonded to the second region, a third adhesive region bonded to the third region, and a first non-adhesive region located between the second and third adhesive regions. Along a second direction, the projection of the first adhesive region overlaps with the first non-adhesive region, and the second direction is the direction in which the first sidewall and the first sidewall are opposite each other.

[0007] This application provides an adhesive component between the electrode assembly and the housing, and removes the adhesive component from the first region. The electrode assembly is then bonded to the adhesive component through the second and third regions. This not only suppresses the movement of the electrode assembly when the electrochemical device is impacted, but also allows the tensile force of the housing to be buffered by the first non-adhesive region and then transmitted to the electrode assembly through the second and third adhesive regions. This helps to reduce the risk of the outer electrode sheet of the electrode assembly tearing when the electrochemical device is impacted.

[0008] In any of the above optional embodiments, the first surface further includes a second non-adhesive region and a third non-adhesive region. Along the first direction, the first adhesive region is located between the second and third non-adhesive regions. Along the second direction, the projection of the second non-adhesive region overlaps with the second adhesive region, and the projection of the third non-adhesive region overlaps with the third adhesive region. This arrangement allows the electrochemical device to better buffer the tensile force transmitted by the casing when subjected to impact, reducing the pulling force of the adhesive components on the second and third regions of the electrode assembly, thereby reducing the risk of tearing of the outer electrode sheet of the electrode assembly.

[0009] In any of the above optional embodiments, the adhesive component includes a first single-sided adhesive, a second single-sided adhesive, and a third single-sided adhesive. The first single-sided adhesive includes a first adhesive surface and a first non-adhesive surface opposite to each other. The first adhesive surface includes a fourth adhesive region, a fifth adhesive region, and a first adhesive region located between the fourth adhesive region and the fifth adhesive region. The second single-sided adhesive includes a second adhesive surface and a second non-adhesive surface opposite to each other, and the second adhesive surface is bonded to the fourth adhesive region and the second region. The third single-sided adhesive includes a third adhesive surface and a third non-adhesive surface opposite to each other, and the third adhesive surface is bonded to the fifth adhesive region and the third region. In this way, by bonding the first single-sided adhesive, the second single-sided adhesive, and the third single-sided adhesive together, the bonding assembly can form a first bonding area, a second bonding area, a third bonding area, a first non-bonding area, a second non-bonding area, and a third non-bonding area. This has the advantages of simple operation, high efficiency, and low cost. At the same time, the bonding section between the second single-sided adhesive and the fourth bonding area of ​​the first single-sided adhesive, and the bonding section between the third single-sided adhesive and the fifth bonding area of ​​the first single-sided adhesive, can further buffer the tensile force of the shell through deformation, thereby further reducing the risk of tearing of the outer electrode sheet of the electrode assembly.

[0010] In any of the above optional embodiments, the adhesive component includes a first double-sided adhesive, a fourth single-sided adhesive, a fifth single-sided adhesive, and a sixth single-sided adhesive. The first double-sided adhesive includes opposing seventh and eighth adhesive surfaces; the seventh adhesive surface includes a sixth adhesive area, a seventh adhesive area, and a first adhesive area located between the sixth and seventh adhesive areas; the eighth adhesive surface includes a second adhesive area, a third adhesive area, and an eighth adhesive area located between the second and third adhesive areas. The fourth single-sided adhesive includes opposing fourth adhesive surfaces and a fourth non-adhesive surface, and the fourth adhesive surface is bonded to the sixth adhesive area; the fifth single-sided adhesive includes opposing fifth adhesive surfaces and a fifth non-adhesive surface, and the fifth adhesive surface is bonded to the seventh adhesive area; the sixth single-sided adhesive includes opposing sixth adhesive surfaces and a sixth non-adhesive surface, and the sixth adhesive surface is bonded to the eighth adhesive area. This configuration makes the fabrication method for forming the adhesive and non-adhesive areas simple to operate, efficient, and low-cost. Meanwhile, by adjusting the size and position of the fourth, fifth, and sixth single-sided adhesives, the relative sizes of the first, second, third, first, second, and third non-adhesive areas can be easily controlled, thereby facilitating the adjustment of the bonding strength between the housing and the electrode assembly, as well as the buffering capacity of the bonding components.

[0011] In any of the above optional embodiments, along the second direction, the projection of the second non-adhesive region overlaps with the first non-adhesive region, and the projection of the third non-adhesive region overlaps with the first non-adhesive region. This configuration allows the adhesive assembly to have localized areas on both sides that are not adhesive. During the transmission of tensile force from the housing to the electrode assembly, this force can be dissipated through the deformation of these localized areas on both sides, thereby reducing the tensile force transmitted from the adhesive assembly to the second and third regions. This helps to reduce the risk of tearing of the outer electrode sheet of the electrode assembly.

[0012] In any of the above optional embodiments, the first single-sided adhesive includes a first adhesive body and a second adhesive body that are separately disposed, the second single-sided adhesive body is bonded to the first adhesive body, and the third single-sided adhesive body is bonded to the second adhesive body.

[0013] In any of the above optional embodiments, the second single-sided adhesive includes a third adhesive and a fourth adhesive that are separately disposed, the third adhesive and the fourth adhesive being arranged along a third direction, the third direction being perpendicular to the first direction and the second direction.

[0014] In any of the above optional embodiments, the third single-sided adhesive includes a fifth adhesive and a sixth adhesive that are separately disposed, the fifth adhesive and the sixth adhesive being arranged along a third direction, the third direction being perpendicular to the first direction and the second direction.

[0015] In any of the above optional embodiments, the electrode assembly further includes a second side, a third side, and a fourth side, wherein the second side is disposed opposite to the first side along a second direction, and the third side is disposed opposite to the fourth side along a first direction.

[0016] In any of the above optional embodiments, the second single-sided adhesive is bonded to both the second region and the third side.

[0017] In any of the above optional embodiments, the third single-sided adhesive is bonded to both the third region and the fourth side.

[0018] In any of the above optional embodiments, the eighth bonding surface further includes a ninth bonding area, the second bonding area is located between the ninth bonding area and the eighth bonding area, and the ninth bonding area is bonded to the third side surface.

[0019] In any of the above optional embodiments, the eighth bonding surface further includes a tenth bonding area, the third bonding area is located between the tenth bonding area and the eighth bonding area, and the tenth bonding area is bonded to the fourth side surface.

[0020] The above configuration enables the bonding assembly to transfer the tensile force of the housing to the third or fourth side of the electrode assembly, which helps to reduce the risk of the outer electrode sheet tearing when the electrochemical device is subjected to impact.

[0021] In any of the above optional embodiments, the second single-sided adhesive is also bonded to the second side surface.

[0022] In any of the above optional embodiments, the third single-sided adhesive is also bonded to the second side.

[0023] In any of the above optional embodiments, the ninth bonding area is also bonded to the second side surface.

[0024] In any of the above optional embodiments, the tenth bonding area is also bonded to the second side surface.

[0025] The above configuration increases the bonding area between the adhesive component and the electrode component, thereby improving the strength of the connection between the housing and the electrode component. At the same time, it can reduce the pulling force of the housing on the electrode component, which helps to reduce the risk of the outer electrode sheet of the electrode component tearing when the electrochemical device is subjected to impact.

[0026] In any of the above optional embodiments, along the second direction, the projection of the first non-adhesive area covers the projection of the first adhesive area, the projection of the second non-adhesive area covers the projection of the second adhesive area, and the projection of the third non-adhesive area covers the projection of the third adhesive area. This arrangement prevents the adhesive assembly from having any localized areas where both the housing and the electrode assembly are simultaneously bonded on both sides, which helps to better buffer the pulling force of the housing on the electrode assembly, thereby reducing the risk of tearing of the outer electrode sheet of the electrode assembly.

[0027] In any of the above optional embodiments, the projection of the first adhesive region covers the first non-adhesive region along the second direction. Further, in some embodiments, the projection of the first adhesive region covers the first non-adhesive region, the second adhesive region, and the third adhesive region along the second direction.

[0028] In any of the above optional embodiments, the adhesive component includes a first single-sided adhesive, a second double-sided adhesive, and a third double-sided adhesive. The first single-sided adhesive includes a first adhesive surface and a first non-adhesive surface, and the first adhesive surface includes a fourth adhesive area, a fifth adhesive area, and an eleventh adhesive area located between the fourth and fifth adhesive areas. The second double-sided adhesive includes a ninth and a tenth adhesive surface, the ninth adhesive surface being bonded to the fourth adhesive area and the second area, and the tenth adhesive surface being bonded to the first sidewall. The third double-sided adhesive includes an eleventh and a twelfth adhesive surface, the eleventh adhesive surface being bonded to the fifth adhesive area and the third area, and the twelfth adhesive surface being bonded to the first sidewall. This arrangement facilitates bonding of the entire first surface of the adhesive component to the first sidewall of the housing, thereby improving the strength of the connection between the adhesive component and the housing.

[0029] In any of the above optional embodiments, the adhesive assembly includes a first double-sided adhesive and a sixth single-sided adhesive. The first double-sided adhesive includes opposing seventh and eighth adhesive surfaces; the seventh adhesive surface is bonded to the first sidewall; the eighth adhesive surface includes a second adhesive area, a third adhesive area, and an eighth adhesive area located between the second and third adhesive areas. The sixth single-sided adhesive includes opposing sixth adhesive surfaces and a sixth non-adhesive surface, and the sixth adhesive surface is bonded to the eighth adhesive area. This configuration, while ensuring that the entire first surface of the adhesive assembly is bonded to the first sidewall of the housing, further reduces the amount of adhesive used, thus improving manufacturing efficiency.

[0030] In any of the above optional embodiments, the first single-sided adhesive includes a first adhesive body and a second adhesive body that are separately disposed, the second double-sided adhesive body is bonded to the first adhesive body, and the third double-sided adhesive body is bonded to the second adhesive body.

[0031] In any of the above optional embodiments, the second double-sided adhesive includes a third adhesive body and a fourth adhesive body that are separately disposed, the third adhesive body and the fourth adhesive body being arranged along a third direction, the third direction being perpendicular to the first direction and the second direction.

[0032] In any of the above optional embodiments, the third double-sided adhesive includes a fifth adhesive body and a sixth adhesive body that are separately disposed, the fifth adhesive body and the sixth adhesive body being arranged along a third direction, the third direction being perpendicular to the first direction and the second direction.

[0033] In any of the above optional embodiments, the width of the electrode assembly is W along the first direction, and the length of the electrode assembly is L along the third direction, which is perpendicular to both the first and second directions.

[0034] In any of the above optional embodiments, along the first direction, the distance between the center of the first bonding area and the center of the first side surface is D1, satisfying: D1≤0.1W. This facilitates more uniform pulling of the housing onto the electrode assembly, reducing the risk of damage to the outer electrode sheet of the electrode assembly.

[0035] In any of the above optional embodiments, along a third direction, the distance between the center of the first bonding area and the center of the first side surface is D2, satisfying: D2≤0.1L. This facilitates more uniform pulling of the housing onto the electrode assembly, reducing the risk of damage to the outer electrode sheet of the electrode assembly.

[0036] In any of the above optional embodiments, the width of the first bonding area along the first direction is S1, satisfying: 0.1W ≤ S1 ≤ 0.85W. This helps to reduce the risk of electrode assembly movement.

[0037] In any of the above optional embodiments, the length of the first bonding area along the third direction is L1, satisfying: 0.3L≤L1≤0.9L. This helps to reduce the risk of electrode assembly movement.

[0038] In any of the above optional embodiments, the width of the first non-adhesive region along the first direction is W1, satisfying: 0.3W ≤ W1 ≤ 0.85W. This helps to better buffer the pulling of the housing on the electrode assembly and reduce the risk of damage to the outer electrode sheet of the electrode assembly.

[0039] In any of the above optional embodiments, along the third direction, the length of the first non-adhesive region is l1, which satisfies: 0.3L≤l1≤0.9L.

[0040] In any of the above optional embodiments, along the first direction, the width of the second bonding area bonded to the second region is H1, satisfying H1≥0.05W. This reduces the risk of electrode assembly movement. In any of the above optional embodiments, H1≤0.3W.

[0041] In any of the above optional embodiments, along the first direction, the distance between the second bonding area and the first bonding area is H2, satisfying H2≥0.05W1. This helps to better buffer the pulling force of the housing on the electrode assembly, reducing the risk of damage to the outer electrode sheet of the electrode assembly. In any of the above optional embodiments, H2≤0.4W1.

[0042] In any of the above optional embodiments, along the first direction, the distance between the third bonding area and the first bonding area is H3, satisfying H3≥0.05W1. This helps to better buffer the pulling force of the housing on the electrode assembly, reducing the risk of damage to the outer electrode sheet of the electrode assembly. In any of the above optional embodiments, H3≤0.4W1.

[0043] In any of the above optional embodiments, along the first direction, the width of the adhesion between the third bonding area and the third region is H4, satisfying H4≥0.05W. This reduces the risk of electrode assembly misalignment. In any of the above optional embodiments, H4≤0.3W.

[0044] In any of the above optional embodiments, the length of the second bonding area along the third direction is L2, satisfying L2≥0.4L1. This reduces the risk of electrode assembly misalignment.

[0045] In any of the above optional embodiments, the length of the third bonding area along the third direction is L3, satisfying L3≥0.4L1. This reduces the risk of electrode assembly misalignment.

[0046] A second aspect of this application provides an electrical device including the electrochemical device in any of the above embodiments. In drop tests, the electrochemical device reduces the risk of electrode assembly shifting and electrode tearing, thereby improving the safety of the electrical device. Attached Figure Description

[0047] Figure 1 This is a schematic diagram of the structure of an electrochemical device provided in an embodiment of this application.

[0048] Figure 2 for Figure 1 A schematic diagram of the decomposition of the electrochemical device.

[0049] Figure 3 This is a cross-sectional view of an electrochemical device provided in an embodiment of this application.

[0050] Figure 4 This is an exploded view of an adhesive component provided in an embodiment of this application.

[0051] Figure 5 This is an exploded view of an adhesive component provided in another embodiment of this application.

[0052] Figure 6 This is a cross-sectional view of an adhesive assembly and an electrode assembly provided in an embodiment of this application.

[0053] Figure 7 A cross-sectional view of an adhesive assembly and an electrode assembly provided in another embodiment of this application.

[0054] Figure 8 This is a cross-sectional view of an adhesive assembly and an electrode assembly provided in another embodiment of this application.

[0055] Figure 9 This is a cross-sectional view of the adhesive assembly and electrode assembly provided in another embodiment of this application.

[0056] Figure 10 This is a cross-sectional view of the adhesive assembly and electrode assembly provided in another embodiment of this application.

[0057] Figure 11 An exploded view of an adhesive component provided in another embodiment of this application.

[0058] Figure 12 This is a schematic diagram of a first single-sided adhesive split configuration provided in an embodiment of this application.

[0059] Figure 13 This is a schematic diagram showing the separate arrangement of the second and third single-sided adhesives according to an embodiment of this application.

[0060] Figure 14 This is a top view of an adhesive assembly and an electrode assembly provided in an embodiment of this application.

[0061] Figure 15 This is a top view of an adhesive assembly and an electrode assembly provided in another embodiment of this application.

[0062] Figure 16 This is a schematic diagram of an electrical device provided in an embodiment of this application.

[0063] Explanation of main component symbols 100. Electrochemical device; 10. Housing; 11. First sidewall; 12. Second sidewall; 13. Third sidewall; 14. Fourth sidewall; 15. Fifth sidewall; 16. Sixth sidewall; 20. Electrode assembly; 21. First side surface; 211. First region; 212. Second region; 213. Third region; 22. Second side surface; 23. Third side surface; 24. Fourth side surface; 25. Fifth side surface; 26. Sixth side surface; 30. Adhesive assembly; 31. First surface; 311. First adhesive area; 312. Second non-adhesive area; 313. Third non-adhesive area; 32. Second surface; 321. First non-adhesive area; 322. Second adhesive area; 323. Third adhesive area; 33. First single-sided adhesive; 331. First adhesive surface; 3311. Fourth adhesive area; 3312. Fifth adhesive area; 3313. Eleventh adhesive area; 332. First non-adhesive surface; 33a. First colloid; 33b. Second colloid; 34. Second single-sided adhesive; 341. Second adhesive surface; 342. Second non-adhesive surface; 3 4a. Third colloid; 34b. Fourth colloid; 35. Third single-sided adhesive; 351. Third bonding surface; 352. Third non-bonding surface; 35a. Fifth colloid; 35b. Sixth colloid; 36. First double-sided adhesive; 361. Seventh bonding surface; 3611. Sixth bonding area; 3612. Seventh bonding area; 362. Eighth bonding surface; 3621. Eighth bonding area; 3622. Ninth bonding area; 3623. Tenth bonding area; 37. Fourth single-sided adhesive; 371. Fourth bonding surface; 372. Fourth non-adhesive surface; 38, Fifth single-sided adhesive; 381, Fifth adhesive surface; 382, ​​Fifth non-adhesive surface; 39, Sixth single-sided adhesive; 391, Sixth adhesive surface; 392, Sixth non-adhesive surface; 41, Second double-sided adhesive; 411, Ninth adhesive surface; 412, Tenth adhesive surface; 42, Third double-sided adhesive; 421, Eleventh adhesive surface; 422, Twelfth adhesive surface; 50, Electrode; 200, Equipment body; 1000, Electrical equipment; X, First direction; Y, Second direction; Z, Third direction. Detailed Implementation

[0064] The technical solutions in the embodiments of this application will be described below. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0065] It should be noted that, in this application, the center of a region refers to the centroid of its planar shape when the region is a continuous whole. Understandably, the centroid of the planar shape can be determined by a suspension method: suspend the planar shape with a thin thread, draw a straight line vertically from the starting point of the thread, suspend the planar shape again with a different endpoint than the first time, and draw another straight line using the same method. The intersection of these two lines is the centroid of the planar shape. When the region consists of multiple discrete regions, the center of the region is the center of the smallest circumcircle containing all the discrete regions. Understandably, the smallest circumcircle is the circle with the smallest radius that contains all the discrete regions.

[0066] Understandably, when a component is considered to be "connected" to another component, it can be directly connected to the other component or may have an intervening component. When a component is considered to be "placed" on another component, it can be directly placed on the other component or may have an intervening component. The terms "top," "bottom," and similar expressions used in this article are for illustrative purposes only.

[0067] The terms “first”, “second”, etc., are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implying the quantity, specific order, or primary and secondary relationship of the indicated technical features.

[0068] The term "perpendicular" is used to describe the ideal state between two components. In actual production or use, two components can exist in a state that is approximately perpendicular. The two parts described as "perpendicular" do not have to be absolute straight lines or planes, but can be roughly straight lines or planes. From a macroscopic perspective, if the overall direction of extension is a straight line or plane, the component can be considered a "straight line" or "plane".

[0069] It should be understood that the dimensions and thicknesses of the components shown in the accompanying drawings are for better understanding and more convenient description, and this application is not limited to the dimensions and thicknesses shown in the accompanying drawings.

[0070] 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 to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0071] Some embodiments of this application will now be described with reference to the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0072] Please see Figure 1 and Figure 2This application provides an electrochemical device 100, which includes a housing 10, an electrode assembly 20, and an adhesive assembly 30. The electrode assembly 20 is disposed within the housing 10, and the adhesive assembly 30 is disposed within the housing 10, with the adhesive assembly 30 located between the housing 10 and the electrode assembly 20, and the adhesive assembly 30 adhesively bonds the housing 10 and the electrode assembly 20.

[0073] In some embodiments, please refer to Figure 3 The housing 10 includes a first sidewall 11 and a second sidewall 12 disposed opposite to each other, and the electrode assembly 20 is located between the first sidewall 11 and the second sidewall 12.

[0074] In some embodiments, please refer to Figure 1 and Figure 3 The housing 10 also includes a third sidewall 13, a fourth sidewall 14, a fifth sidewall 15, and a sixth sidewall 16. The third sidewall 13 and the fourth sidewall 14 are arranged opposite each other along a first direction X, the first sidewall 11 and the second sidewall 12 are arranged opposite each other along a second direction Y, and the fifth sidewall 15 and the sixth sidewall 16 are arranged opposite each other along a third direction Z. The first direction X is perpendicular to both the second direction Y and the third direction Z. The first sidewall 11, the second sidewall 12, the third sidewall 13, the fourth sidewall 14, the fifth sidewall 15, and the sixth sidewall 16 enclose a space for housing the electrode assembly 20.

[0075] In some embodiments, the housing 10 is an aluminum-plastic film, but the housing 10 is not limited to aluminum-plastic film.

[0076] In some embodiments, the electrode assembly 20 includes a positive electrode, a negative electrode, and a separator. The positive electrode, the negative electrode, and the separator can be stacked to form a stacked structure, or the positive electrode, the negative electrode, and the separator can be stacked and then wound to form a wound structure.

[0077] In some embodiments, the positive electrode includes a positive current collector and a positive active material layer disposed on the positive current collector; the negative electrode includes a negative current collector and a negative active material layer disposed on the negative current collector.

[0078] In some embodiments, a portion of the positive current collector is provided with a positive active material layer, and a portion of the positive current collector is not provided with a positive active material layer; a portion of the negative current collector is provided with a negative active material layer, and a portion of the negative current collector is not provided with a negative active material layer.

[0079] The positive and negative current collectors can be metal layers. As an example, the positive current collector can be a metal layer including at least one of aluminum, nickel, tantalum, and titanium, such as aluminum foil. The positive active material layer includes a positive active material, which can include at least one of lithium cobalt oxide, lithium nickel cobalt manganese oxide, lithium nickel cobalt aluminum oxide, lithium iron phosphate, lithium manganese iron phosphate, or lithium manganese oxide. The negative current collector can be a metal layer including at least one of copper, nickel, tantalum, and titanium, such as copper foil. The negative active material layer includes a negative active material, which can include at least one of graphite, hard carbon, soft carbon, silicon, silicon-oxygen materials, and silicon-carbon materials.

[0080] In some embodiments, the outermost ring of the electrode assembly 20 has a positive current collector layer without a positive active material layer, and the positive current collector is aluminum foil.

[0081] In some embodiments, please refer to Figure 3 The electrode assembly 20 includes a first side surface 21 adjacent to the first sidewall 11. The first side surface 21 includes a first region 211, a second region 212 and a third region 213. Along the first direction X, the first region 211 is located between the second region 212 and the third region 213.

[0082] In some embodiments, please refer to Figure 3 The electrode assembly 20 also includes a second side surface 22, a third side surface 23, and a fourth side surface 24. Along the second direction Y, the first side surface 21 is disposed opposite to the second side surface 22, and the first side surface 21 is adjacent to the first sidewall 11 relative to the second side surface 22. The second side surface 22 is disposed away from the first sidewall 11. The third side surface 23 and the fourth side surface 24 are disposed opposite to each other along the first direction X. When the electrode assembly 20 is a wound structure, the third side surface 23 and the fourth side surface 24 are arc-shaped sides.

[0083] In some embodiments, please refer to Figure 2 The electrode assembly 20 also includes a fifth side 25 and a sixth side 26, which are disposed opposite each other along a third direction Z.

[0084] In some embodiments, please refer to Figure 1 and Figure 2 The electrochemical device 100 also includes a tab 50, which is connected to the electrode assembly 20. Along the third direction Z, the tab 50 extends from the fifth side 25 or the sixth side 26 of the electrode assembly 20 into the housing 10 to draw out the polarity of the electrode assembly 20. When the tab 50 is connected to the positive electrode of the electrode assembly 20, it is a positive tab 50; when the tab 50 is connected to the negative electrode of the electrode assembly 20, it is a negative tab 50. The tab 50 can be made of copper or aluminum, without specific limitations.

[0085] In some embodiments, please refer to Figure 3 The adhesive component 30 includes a first surface 31 and a second surface 32 disposed opposite to each other. The first surface 31 is adjacent to the housing 10 relative to the second surface 32, and the second surface 32 is opposite to the housing 10. The first surface 31 includes a first adhesive region 311 bonded to the first sidewall 11. The second surface 32 includes a second adhesive region 322 bonded to the second region 212, a third adhesive region 323 bonded to the third region 213, and a first non-adhesive region 321 located between the second adhesive region 322 and the third adhesive region 323. Along the second direction Y, the projection of the first adhesive region 311 overlaps with the first non-adhesive region 321. The second direction Y is the direction in which the first sidewall 11 is opposite to the first side surface 21.

[0086] This application provides an adhesive component 30 between the electrode assembly 20 and the housing 10, and removes the adhesive component 30 from the first region 211. The electrode assembly 20 is then bonded to the adhesive component 30 through the second region 212 and the third region 213. This not only suppresses the movement of the electrode assembly 20 when the electrochemical device 100 is impacted, but also allows the tensile force of the housing 10 to be buffered by the first non-adhesive region 321 and then transmitted to the electrode assembly 20 through the second adhesive region 322 and the third adhesive region 323. This helps to reduce the risk of the outer electrode sheet of the electrode assembly 20 tearing when the electrochemical device 100 is impacted.

[0087] In some embodiments, please refer to Figure 3 The first surface 31 also includes a second non-adhesive region 312 and a third non-adhesive region 313. Along the first direction X, the first adhesive region 311 is located between the second non-adhesive region 312 and the third non-adhesive region 313. Along the second direction Y, the projection of the second non-adhesive region 312 overlaps with the second adhesive region 322, and the projection of the third non-adhesive region 313 overlaps with the third adhesive region 323. This arrangement allows the electrochemical device 100 to better buffer the tensile force transmitted by the housing 10 when subjected to impact, reducing the pulling force of the adhesive component 30 on the second region 212 and the third region 213 of the electrode assembly 20, thereby reducing the risk of tearing of the outer electrode sheet of the electrode assembly 20.

[0088] In some embodiments, along the second direction Y, the projection of the first non-adhesive region 321 covers the projection of the first adhesive region 311, the projection of the second non-adhesive region 312 covers the projection of the second adhesive region 322, and the projection of the third non-adhesive region 313 covers the projection of the third adhesive region 323. This arrangement prevents the adhesive assembly 30 from having any partial adhesion between both the housing 10 and the electrode assembly 20 on both sides simultaneously, which helps to better buffer the pulling force of the housing 10 on the electrode assembly 20, thereby reducing the risk of tearing of the outer electrode sheet of the electrode assembly 20.

[0089] In some embodiments, please refer to Figure 3and Figure 4 The adhesive assembly 30 includes a first single-sided adhesive 33, a second single-sided adhesive 34, and a third single-sided adhesive 35. The first single-sided adhesive 33 includes a first adhesive surface 331 and a first non-adhesive surface 332, which are opposite each other. The first adhesive surface 331 includes a fourth adhesive region 3311, a fifth adhesive region 3312, and a first adhesive region 311 located between the fourth adhesive region 3311 and the fifth adhesive region 3312. The second single-sided adhesive 34 includes a second adhesive surface 341 and a second non-adhesive surface 342, which are opposite each other. The second adhesive surface 341 is bonded to the fourth adhesive region 3311 and the second region 212. The third single-sided adhesive 35 includes a third adhesive surface 351 and a third non-adhesive surface 352, which are opposite each other. The third adhesive surface 351 is bonded to the fifth adhesive region 3312 and the third region 213.

[0090] Understandably, the first non-adhesive surface 332 of the first single-sided adhesive 33 forms the first non-adhesive area 321; the second non-adhesive surface of the second single-sided adhesive 34 forms the second non-adhesive area 312; and the third non-adhesive surface 352 of the third single-sided adhesive 35 forms the third non-adhesive area 313. By bonding the first single-sided adhesive 33, the second single-sided adhesive 34, and the third single-sided adhesive 35 together, the bonding assembly 30 can form a first bonding area 311, a second bonding area 322, a third bonding area 323, a first non-bonding area 321, a second non-bonding area 312, and a third non-bonding area 313. This method has the advantages of simple operation, high efficiency, and low cost. At the same time, the bonding section between the second single-sided adhesive 34 and the fourth bonding area 3311 of the first single-sided adhesive 33, and the bonding section between the third single-sided adhesive 35 and the fifth bonding area 3312 of the first single-sided adhesive 33, can further buffer the tensile force of the housing 10 through deformation, thereby further reducing the risk of tearing of the outer electrode sheet of the electrode assembly 20.

[0091] In some embodiments, please refer to Figure 3 and Figure 4 Along the second direction Y, the projection of the second non-adhesive region 312 overlaps with the first non-adhesive region 321, and the projection of the third non-adhesive region 313 also overlaps with the first non-adhesive region 321. The overlapping areas of the projections of the second non-adhesive region 312 and the first non-adhesive region 321, as well as the overlapping areas of the projections of the third non-adhesive region 313 and the first non-adhesive region 321, constitute the non-adhesive portions of the adhesive component 30 on both sides. With this configuration, the tensile force of the housing 10 transmitted to the electrode assembly 20 can be dissipated through the deformation of these non-adhesive portions, thereby reducing the tensile force transmitted by the adhesive component 30 to the second region 212 and the third region 213, thus helping to reduce the risk of tearing of the outer electrode sheet of the electrode assembly 20.

[0092] In some embodiments, please refer to Figure 3 and Figure 5The adhesive assembly 30 includes a first double-sided adhesive 36, a fourth single-sided adhesive 37, a fifth single-sided adhesive 38, and a sixth single-sided adhesive 39. The first double-sided adhesive 36 includes opposing seventh adhesive surfaces 361 and eighth adhesive surfaces 362. The seventh adhesive surface 361 includes a sixth adhesive region 3611, a seventh adhesive region 3612, and a first adhesive region 311 located between the sixth adhesive region 3611 and the seventh adhesive region 3612. The eighth adhesive surface 362 includes a second adhesive region 322, a third adhesive region 323, and an eighth adhesive region 3621 located between the second adhesive region 322 and the third adhesive region 323. The fourth single-sided adhesive 37 includes opposing fourth adhesive surfaces 371 and fourth non-adhesive surfaces 372, with the fourth adhesive surface 371 bonded to the sixth adhesive region 3611. The fifth single-sided adhesive 38 includes a fifth adhesive surface 381 and a fifth non-adhesive surface 382, ​​with the fifth adhesive surface 381 bonded to the seventh adhesive area 3612. The sixth single-sided adhesive 39 includes a sixth adhesive surface 391 and a sixth non-adhesive surface 392, with the sixth adhesive surface 391 bonded to the eighth adhesive area 3621.

[0093] Understandably, by setting the first double-sided adhesive 36 and the fourth single-sided adhesive 37, fifth single-sided adhesive 38, and sixth single-sided adhesive 39 bonded to the first double-sided adhesive 36, the bonding component 30 can form a first bonding area 311, a second bonding area 322, a third bonding area 323, a first non-bonding area 321, a second non-bonding area 312, and a third non-bonding area 313. This method of forming bonding and non-bonding areas has the advantages of simple operation, high efficiency, and low cost. In addition, by adjusting the size and position of the fourth single-sided adhesive 37, the fifth single-sided adhesive 38, and the sixth single-sided adhesive 39, the relative size of each bonding and non-bonding area can be easily controlled, thereby facilitating the adjustment of the bonding strength between the housing 10 and the electrode assembly 20, as well as the buffering capacity of the bonding component 30.

[0094] In some embodiments, please refer to Figure 5 Along the second direction Y, the projection of the fourth single-sided adhesive 37 overlaps with the sixth single-sided adhesive 39, and the projection of the fifth single-sided adhesive 38 overlaps with the sixth single-sided adhesive 39. The areas where the projections of the fourth single-sided adhesive 37 and the sixth single-sided adhesive 39 overlap, as well as the areas where the fifth single-sided adhesive 38 and the sixth single-sided adhesive 39 overlap, are the non-adhesive parts on both sides of the adhesive assembly 30. With this configuration, the tensile force of the housing 10 is dissipated through the deformation of the aforementioned non-adhesive parts during the transmission of the tensile force from the adhesive assembly 30 to the second region 212 and the third region 213, thereby reducing the risk of tearing of the outer electrode sheet of the electrode assembly 20.

[0095] In some other embodiments, along the second direction Y, the projection of the fourth single-sided adhesive 37 does not overlap with the sixth single-sided adhesive 39, and the projection of the fifth single-sided adhesive 38 does not overlap with the sixth single-sided adhesive 39. Thus, the adhesive assembly 30 may have regions where both sides are adhesive, for example, along the second direction Y, the projection of the fourth single-sided adhesive 37 or the projection of the fifth single-sided adhesive 38 is separate from the sixth single-sided adhesive 39; alternatively, it may not have regions where both sides are adhesive, for example, along the second direction Y, the projections of the fourth single-sided adhesive 37 and the fifth single-sided adhesive 38 are respectively connected to the sixth single-sided adhesive 39.

[0096] In some embodiments, please refer to Figure 6 The second adhesive surface 341 of the second single-sided adhesive 34 is bonded to both the second region 212 and the third side surface 23. This arrangement allows the adhesive assembly 30 to transfer the tensile force of the housing 10 to the third side surface 23 of the electrode assembly 20, which helps to reduce the risk of tearing of the outer electrode sheet of the electrode assembly 20.

[0097] In some embodiments, please refer to Figure 6 The third adhesive surface 351 of the third single-sided adhesive 35 is bonded to both the third region 213 and the fourth side surface 24. This arrangement allows the adhesive assembly 30 to transfer the tensile force of the housing 10 to the fourth side surface 24 of the electrode assembly 20, which helps to reduce the risk of tearing of the outer electrode sheet of the electrode assembly 20.

[0098] In the embodiment where the second adhesive surface 341 is bonded to both the second region 212 and the third side surface 23, and the third adhesive surface 351 is bonded to both the third region 213 and the fourth side surface 24, the adhesive assembly 30 can transmit the tensile force of the housing 10 to both sides of the electrode assembly 20 in the first direction X, which is beneficial to improving the uniformity of the force on the electrode assembly 20.

[0099] In some embodiments, please refer to Figure 7 The eighth bonding surface 362 also includes a ninth bonding area 3622, and a second bonding area 322 is located between the ninth bonding area 3622 and the eighth bonding area 3621. The ninth bonding area 3622 is bonded to the third side surface 23. This arrangement allows the bonding assembly 30 to transfer the tensile force of the housing 10 to the third side surface 23 of the electrode assembly 20, which helps to reduce the risk of tearing of the outer electrode sheet of the electrode assembly 20.

[0100] In some embodiments, please refer to Figure 7 The eighth bonding surface 362 also includes a tenth bonding region 3623. The third bonding region 323 is located between the tenth bonding region 3623 and the eighth bonding region 3621. The tenth bonding region 3623 is bonded to the fourth side surface 24. This arrangement allows the bonding assembly 30 to transfer the tensile force of the housing 10 to the fourth side surface 24 of the electrode assembly 20, which helps to reduce the risk of tearing of the outer electrode sheet of the electrode assembly 20.

[0101] In some embodiments, please refer to Figure 8 The second adhesive surface 341 of the second single-sided adhesive 34 is also bonded to the second side surface 22. This arrangement increases the bonding area between the adhesive assembly 30 and the electrode assembly 20, thereby improving the firmness of the connection between the housing 10 and the electrode assembly 20. At the same time, it can reduce the pulling of the housing 10 on the electrode assembly 20, which helps to reduce the risk of tearing of the outer electrode sheet of the electrode assembly 20.

[0102] In some embodiments, please refer to Figure 8 The third adhesive surface 351 of the third single-sided adhesive 35 is also bonded to the second side surface 22. This arrangement increases the bonding area between the adhesive assembly 30 and the electrode assembly 20, thereby improving the firmness of the connection between the housing 10 and the electrode assembly 20. At the same time, it can reduce the pulling of the housing 10 on the electrode assembly 20, which helps to reduce the risk of tearing of the outer electrode sheet of the electrode assembly 20.

[0103] In some embodiments, please refer to Figure 9 The ninth bonding area 3622 is also bonded to the second side 22, which increases the bonding area between the bonding component 30 and the electrode component 20, thereby improving the firmness of the connection between the housing 10 and the electrode component 20; at the same time, it can reduce the pulling of the housing 10 on the electrode component 20, which helps to reduce the risk of tearing of the outer electrode sheet of the electrode component 20.

[0104] In some embodiments, please refer to Figure 9 The tenth bonding area 3623 is also bonded to the second side 22, which increases the bonding area between the bonding component 30 and the electrode component 20, thereby improving the firmness of the connection between the housing 10 and the electrode component 20; at the same time, it can reduce the pulling of the housing 10 on the electrode component 20, which helps to reduce the risk of tearing of the outer ring electrode sheet of the electrode component 20.

[0105] In some embodiments, please refer to Figure 10 Along the second direction Y, the projection of the first adhesive area 311 covers the first non-adhesive area 321. This arrangement helps to increase the area of ​​the first adhesive area 311, thereby improving the strength of the connection between the adhesive component 30 and the housing 10. Further, please refer to... Figure 10 Along the second direction Y, the projection of the first adhesive region 311 covers the first non-adhesive region 321, the second adhesive region 322 and the third adhesive region 323.

[0106] In some embodiments, please refer to Figure 11The adhesive assembly 30 includes a first single-sided adhesive 33, a second double-sided adhesive 41, and a third double-sided adhesive 42. The first single-sided adhesive 33 includes a first adhesive surface 331 and a first non-adhesive surface 332, which are opposite each other. The first adhesive surface 331 includes a fourth adhesive region 3311, a fifth adhesive region 3312, and an eleventh adhesive region 3313 located between the fourth adhesive region 3311 and the fifth adhesive region 3312. The second double-sided adhesive 41 includes a ninth adhesive surface 411 and a tenth adhesive surface 412, which are opposite each other. The ninth adhesive surface 411 is bonded to the fourth adhesive region 3311 and the second region 212, and the tenth adhesive surface 412 is bonded to the first sidewall 11. The third double-sided adhesive 42 includes an eleventh adhesive surface 421 and a twelfth adhesive surface 422, which are opposite each other. The eleventh adhesive surface 421 is bonded to the fifth adhesive region 3312 and the third region 213, and the twelfth adhesive surface 422 is bonded to the first sidewall 11.

[0107] Understandably, the eleventh bonding area 3313, the tenth bonding surface 412, and the twelfth bonding surface 422 together form the first bonding area 311. This arrangement is beneficial for ensuring that the first surface 31 of the bonding component 30 is fully bonded to the first sidewall 11 of the housing 10, thereby improving the strength of the connection between the bonding component 30 and the housing 10.

[0108] In some embodiments, please refer to Figure 10 The adhesive assembly 30 includes a first double-sided adhesive 36 and a sixth single-sided adhesive 39. The first double-sided adhesive 36 includes opposing seventh adhesive surfaces 361 and eighth adhesive surfaces 362. The seventh adhesive surface 361 is bonded to the first sidewall 11. The eighth adhesive surface 362 includes a second adhesive area 322, a third adhesive area 323, and an eighth adhesive area 3621 located between the second adhesive area 322 and the third adhesive area 323. The sixth single-sided adhesive 39 includes opposing sixth adhesive surfaces 391 and a sixth non-adhesive surface 392. The sixth adhesive surface 391 is bonded to the eighth adhesive area 3621. This configuration, while ensuring that the first surface 31 of the adhesive assembly 30 is fully bonded to the first sidewall 11 of the housing 10, further reduces the amount of adhesive, thus improving manufacturing efficiency.

[0109] In some embodiments, please refer to Figure 12 The first single-sided adhesive 33 includes a first adhesive 33a and a second adhesive 33b that are separately disposed. The second single-sided adhesive 34 is bonded to the first adhesive 33a, and the third single-sided adhesive 35 is bonded to the second adhesive 33b.

[0110] Understandably, the two opposing sides of the first colloid 33a and the two opposing sides of the second colloid 33b together form the first adhesive surface 331 and the first non-adhesive surface 332.

[0111] In some embodiments, the first colloid 33a and the second colloid 33b are arranged along a first direction X; in another embodiment, the first colloid 33a and the second colloid 33b are arranged along a third direction Z.

[0112] In some embodiments, please refer to Figure 13 The second single-sided adhesive 34 includes a third adhesive 34a and a fourth adhesive 34b, which are separately arranged and are arranged along the third direction Z.

[0113] Understandably, the two opposing sides of the third colloid 34a and the two opposing sides of the fourth colloid 34b together form the second adhesive surface 341 and the second non-adhesive surface 342.

[0114] In other embodiments, the second single-sided adhesive 34 may also include more separate adhesive components, which will not be described in detail here.

[0115] In some embodiments, please refer to Figure 13 The third single-sided adhesive 35 includes a fifth adhesive 35a and a sixth adhesive 35b, which are separately arranged and are arranged along the third direction Z.

[0116] Understandably, the two opposing sides of the fifth colloid 35a and the two opposing sides of the sixth colloid 35b together form the third adhesive surface 351 and the third non-adhesive surface 352.

[0117] In other embodiments, the third single-sided adhesive 35 may also include more separate adhesive components, which will not be described in detail here.

[0118] In some embodiments, please refer to Figure 14 Along the first direction X, the width of the electrode assembly 20 is W, and along the third direction Z, the length of the electrode assembly 20 is L. Along the first direction X, the distance between the center of the first bonding area 311 and the center of the first side surface 21 is D1, which satisfies: D1≤0.1W. This helps to make the electrode assembly 20 more uniformly stressed and reduce the risk of damage to the outer electrode sheet of the electrode assembly 20.

[0119] In some embodiments, please refer to Figure 14 Along the third direction Z, the distance between the center of the first bonding area 311 and the center of the first side surface 21 is D2, which satisfies: D2≤0.1L. This helps to make the force on the electrode assembly 20 more uniform and reduces the risk of damage to the outer electrode sheet of the electrode assembly 20.

[0120] In some embodiments, please refer to Figure 15 Along the first direction X, the width of the first bonding area 311 is S1, which satisfies: 0.1W ≤ S1 ≤ 0.85W. This helps to reduce the risk of displacement of the electrode assembly 20.

[0121] In some embodiments, please refer to Figure 15 Along the third direction Z, the length of the first bonding region 311 is L1, which satisfies: 0.3L≤L1≤0.9L. This helps to reduce the risk of displacement of the electrode assembly 20.

[0122] In some embodiments, please refer to Figure 15 Along the first direction X, the width of the first non-adhesive area 321 is W1, which satisfies: 0.3W≤W1≤0.85W. This helps to better buffer the pulling of the housing 10 on the electrode assembly 20 and reduce the risk of damage to the outer electrode sheet of the electrode assembly 20.

[0123] In some embodiments, please refer to Figure 15 Along the third direction Z, the length of the first non-adhesive region 321 is l1, which satisfies: 0.3L≤l1≤0.9L.

[0124] In some embodiments, please refer to Figure 15 Along the first direction X, the width of the adhesion between the second bonding area 322 and the second region 212 is H1, satisfying H1≥0.05W. This reduces the risk of misalignment of the electrode assembly 20. In some embodiments, H1≤0.3W.

[0125] In some embodiments, please refer to Figure 15 Along the first direction X, the distance between the second bonding area 322 and the first bonding area 311 is H2, satisfying H2≥0.05W1. This helps to better buffer the pulling of the housing 10 on the electrode assembly 20, reducing the risk of damage to the outer electrode sheet of the electrode assembly 20. In some embodiments, H2≤0.4W1.

[0126] In some embodiments, please refer to Figure 15 Along the first direction X, the distance between the third bonding area 323 and the first bonding area 311 is H3, satisfying H3≥0.05W1. This helps to better buffer the pulling of the housing 10 on the electrode assembly 20, reducing the risk of damage to the outer electrode sheet of the electrode assembly 20. In some embodiments, H3≤0.4W1.

[0127] In some embodiments, please refer to Figure 15 Along the first direction X, the width of the adhesion between the third bonding area 323 and the third region 213 is H4, satisfying H4≥0.05W. This reduces the risk of misalignment of the electrode assembly 20. In some embodiments, H4≤0.3W.

[0128] In some embodiments, please refer to Figure 15Along the third direction Z, the length of the second bonding region 322 is L2, which satisfies L2≥0.4L1. This reduces the risk of electrode assembly 20 shifting.

[0129] In some embodiments, please refer to Figure 15 Along the third direction Z, the length of the third bonding region 323 is L3, which satisfies L3≥0.4L1. This reduces the risk of electrode assembly 20 shifting.

[0130] To verify the influence of each adhesive and non-adhesive region of the adhesive component 30 on the electrochemical device 100, the following experiment was conducted using a lithium-ion pouch battery as an example: A lithium-ion pouch battery with a rectangular maximum projection surface is selected. The length L of the internal wound electrode assembly 20 of the lithium-ion pouch battery is 87 mm, the width W is 64 mm, and the thickness is 4.8 mm.

[0131] In Examples 1-21, the adhesive assembly 30 includes a first single-sided adhesive 33, a second single-sided adhesive 34, and a third single-sided adhesive 35. The center of the first single-sided adhesive 33 coincides with the center of the first side surface of the electrode assembly 20. The dimensional parameters of the adhesive assembly 30 are shown in Table 1 below. In Example 7, the second single-sided adhesive 34 and the third single-sided adhesive 35 are respectively bonded to the third side surface 23 and the fourth side surface 24 of the electrode assembly 20. In Examples 8-12, the second single-sided adhesive 34 and the third single-sided adhesive 35 are further bonded to the second side surface 22 of the electrode assembly 20.

[0132] In Example 22, the difference from Example 1 is that the adhesive component 30 includes a first double-sided adhesive 36 and a sixth single-sided adhesive 39. The first double-sided adhesive 36 has a length of 50 mm and a width of 52 mm, and the sixth single-sided adhesive 39 has a length of 50 mm and a width of 42 mm.

[0133] In the comparative example, a first double-sided adhesive tape 36 with a length of 50 mm and a width of 42 mm was used to bond the electrode assembly 20 to the housing 10, which is an aluminum-plastic film.

[0134] Twenty batteries from each group were used in a drop test to compare pass rates. The batteries were dropped from six sides and four corners at a height of 1.8m. After the drops, the casing 10 was checked for damage or leakage, and the number of batteries with damaged casings or leakage was counted. If the casing 10 was not damaged or leaked, the lithium-ion pouch batteries were disassembled, and the outer electrode plates of the electrode assembly 20 were checked for tears or damage. The number of batteries with torn or damaged outer electrode plates was counted. Batteries with intact casings and no leakage, and with no torn or damaged outer electrode plates, were considered to have passed the test; otherwise, they were considered to have failed. Pass rate = (Number of passes / 20) × 100%.

[0135] Table 1: Test results of changes in the dimensions of the first single-sided adhesive 33, the second single-sided adhesive 34, and the third single-sided adhesive 35, and the structure of the adhesive assembly 30. As can be seen from the comparison of the embodiments and comparative examples in Table 1, the adhesive component 30 of this application cancels the adhesion with the first region 211, and the electrode component 20 is bonded to the adhesive component 30 through the second region 212 and the third region 213. While suppressing the movement of the electrode component 20 during battery drop, it can also buffer the tensile force of the shell 10 through the first non-adhesive region 321 and then transfer it to the electrode component 20 through the second adhesive region 322 and the third adhesive region 323. This helps to reduce the risk of the outer electrode sheet of the electrode component 20 tearing during battery drop, thereby significantly improving the drop test pass rate and improving the safety of battery use. At the same time, as can be seen from the comparison of Embodiment 1 and Embodiment 22, the bonding section between the second single-sided adhesive 34 and the first single-sided adhesive 33, and the bonding section between the third single-sided adhesive 35 and the first single-sided adhesive 33, can further buffer the tensile force of the shell 10 through deformation, thereby further reducing the risk of the outer electrode sheet of the electrode component 20 tearing.

[0136] Please see Figure 16 The embodiments of this application also provide an electrical device 1000, which includes the electrochemical device 100 described above.

[0137] In some embodiments, please refer to Figure 16 The electrical equipment 1000 also includes a main body 200, and an electrochemical device 100 is installed on the main body 200 to supply power to the main body 200.

[0138] In some embodiments, the electrical device 1000 may be a Bluetooth headset, Bluetooth speaker, mobile phone, laptop, tablet computer, e-book player, electric toy, game console, video recorder, portable recorder, radio, smartwatch, lamp, or calculator, etc., which will not be listed here.

[0139] Since the electrical equipment 1000 adopts the technical solution of any embodiment of the electrochemical device 100, it has at least the beneficial effects brought about by the technical solution of any embodiment of the electrochemical device 100, which will not be described in detail here.

[0140] Furthermore, those skilled in the art should recognize that the above embodiments are merely illustrative of this application and are not intended to limit this application. Any appropriate changes and modifications made to the above embodiments within the substantive scope of this application fall within the scope of this application's disclosure.

Claims

1. An electrochemical device, characterized in that, include: A housing, the housing including a first sidewall; An electrode assembly is disposed within the housing. The electrode assembly includes a first side surface adjacent to the first sidewall. The first side surface includes a first region, a second region, and a third region. Along a first direction, the first region is located between the second region and the third region. An adhesive assembly is located between the housing and the electrode assembly. The adhesive assembly includes a first surface and a second surface facing each other. The first surface is adjacent to the housing, and the second surface faces away from the housing. The first surface includes a first adhesive area that is bonded to the first sidewall. The second surface includes a second adhesive area bonded to the second region, a third adhesive area bonded to the third region, and a first non-adhesive area located between the second adhesive area and the third adhesive area; Along the second direction, the projection of the first adhesive area overlaps with the first non-adhesive area, and the second direction is the direction in which the first sidewall is opposite to the first side surface.

2. The electrochemical device according to claim 1, characterized in that, The first surface further includes a second non-adhesive area and a third non-adhesive area. Along the first direction, the first adhesive area is located between the second non-adhesive area and the third non-adhesive area. Along the second direction, the projection of the second non-adhesive area overlaps with the second adhesive area, and the projection of the third non-adhesive area overlaps with the third adhesive area.

3. The electrochemical device according to claim 2, characterized in that, The electrochemical device satisfies any of the following conditions: (1) The adhesive component includes a first single-sided adhesive, a second single-sided adhesive and a third single-sided adhesive. The first single-sided adhesive includes a first adhesive surface and a first non-adhesive surface opposite to each other. The first adhesive surface includes a fourth adhesive area, a fifth adhesive area and a first adhesive area located between the fourth adhesive area and the fifth adhesive area. The second single-sided adhesive includes a second adhesive surface and a second non-adhesive surface, wherein the second adhesive surface is bonded to the fourth adhesive area and the second region; The third single-sided adhesive includes a third bonding surface and a third non-bonding surface, and the third bonding surface is bonded to the fifth bonding area and the third region; (2) The adhesive assembly includes a first double-sided adhesive, a fourth single-sided adhesive, a fifth single-sided adhesive, and a sixth single-sided adhesive; The first double-sided adhesive includes a seventh adhesive surface and an eighth adhesive surface opposite to each other; the seventh adhesive surface includes a sixth adhesive area, a seventh adhesive area, and a first adhesive area located between the sixth adhesive area and the seventh adhesive area; The eighth bonding surface includes the second bonding area, the third bonding area, and an eighth bonding area located between the second bonding area and the third bonding area; The fourth single-sided adhesive includes a fourth adhesive surface and a fourth non-adhesive surface, the fourth adhesive surface being bonded to the sixth adhesive area; the fifth single-sided adhesive includes a fifth adhesive surface and a fifth non-adhesive surface, the fifth adhesive surface being bonded to the seventh adhesive area; the sixth single-sided adhesive includes a sixth adhesive surface and a sixth non-adhesive surface, the sixth adhesive surface being bonded to the eighth adhesive area. (3) Along the second direction, the projection of the second non-adhesive area overlaps with the first non-adhesive area, and the projection of the third non-adhesive area overlaps with the first non-adhesive area.

4. The electrochemical device according to claim 3, characterized in that, The adhesive component satisfies at least one of the following conditions: (1) The first single-sided adhesive includes a first adhesive body and a second adhesive body that are separately disposed, the second single-sided adhesive body is bonded to the first adhesive body, and the third single-sided adhesive body is bonded to the second adhesive body; (2) The second single-sided adhesive includes a third adhesive body and a fourth adhesive body that are separately arranged. The third adhesive body and the fourth adhesive body are arranged along a third direction, and the third direction is perpendicular to the first direction and the second direction. (3) The third single-sided adhesive includes a fifth adhesive and a sixth adhesive that are separately arranged. The fifth adhesive and the sixth adhesive are arranged along a third direction, which is perpendicular to the first direction and the second direction.

5. The electrochemical device according to claim 3, characterized in that, The electrode assembly further includes a second side, a third side, and a fourth side, wherein the second side and the first side are disposed opposite to each other along the second direction, and the third side and the fourth side are disposed opposite to each other along the first direction, satisfying at least one of the following conditions: (1) The second single-sided adhesive is bonded to both the second region and the third side surface; (2) The third single-sided adhesive is bonded to both the third region and the fourth side surface; (3) The eighth bonding surface further includes a ninth bonding area, the second bonding area is located between the ninth bonding area and the eighth bonding area, and the ninth bonding area is bonded to the third side surface; (4) The eighth bonding surface further includes a tenth bonding area, the third bonding area is located between the tenth bonding area and the eighth bonding area, and the tenth bonding area is bonded to the fourth side surface.

6. The electrochemical device according to claim 5, characterized in that, At least one of the following conditions must be met: (1) The second single-sided adhesive is also bonded to the second side surface; (2) The third single-sided adhesive is also bonded to the second side surface; (3) The ninth bonding area is also bonded to the second side surface; (4) The tenth bonding area is also bonded to the second side surface.

7. The electrochemical device according to claim 2, characterized in that, Along the second direction, the first non-adhesive area covers the projection of the first adhesive area, the projection of the second non-adhesive area covers the second adhesive area, and the projection of the third non-adhesive area covers the third adhesive area.

8. The electrochemical device according to claim 1, characterized in that, Along the second direction, the projection of the first adhesive area covers the first non-adhesive area.

9. The electrochemical device according to claim 8, characterized in that, The electrochemical device satisfies any of the following conditions: (1) The adhesive assembly includes a first single-sided adhesive, a second double-sided adhesive and a third double-sided adhesive. The first single-sided adhesive includes a first adhesive surface and a first non-adhesive surface opposite to each other. The first adhesive surface includes a fourth adhesive area, a fifth adhesive area and an eleventh adhesive area located between the fourth adhesive area and the fifth adhesive area. The second double-sided adhesive includes a ninth adhesive surface and a tenth adhesive surface opposite to each other, the ninth adhesive surface being bonded to the fourth adhesive area and the second region; The third double-sided adhesive includes an eleventh adhesive surface and a twelfth adhesive surface, the eleventh adhesive surface being bonded to the fifth adhesive area and the third region; (2) The adhesive assembly includes a first double-sided adhesive and a sixth single-sided adhesive; The first double-sided adhesive includes a seventh adhesive surface and an eighth adhesive surface that are opposite each other; The seventh adhesive surface is bonded to the first sidewall; the eighth adhesive surface includes the second adhesive area, the third adhesive area, and an eighth adhesive area located between the second adhesive area and the third adhesive area; The sixth single-sided adhesive includes a sixth bonding surface and a sixth non-bonding surface, and the sixth bonding surface is bonded to the eighth bonding area.

10. The electrochemical device according to claim 9, characterized in that, The adhesive component satisfies at least one of the following conditions: (1) The first single-sided adhesive includes a first adhesive and a second adhesive that are separately disposed, the second double-sided adhesive is bonded to the first adhesive, and the third double-sided adhesive is bonded to the second adhesive; (2) The second double-sided adhesive includes a third adhesive body and a fourth adhesive body that are separately disposed, the third adhesive body and the fourth adhesive body are arranged along a third direction, and the third direction is perpendicular to the first direction and the second direction; (3) The third double-sided adhesive includes a fifth adhesive and a sixth adhesive that are separately arranged. The fifth adhesive and the sixth adhesive are arranged along a third direction, which is perpendicular to the first direction and the second direction.

11. The electrochemical device according to any one of claims 1 to 10, characterized in that, Along the first direction, the width of the electrode assembly is W, and along the third direction, the length of the electrode assembly is L, and the third direction is perpendicular to both the first direction and the second direction. At least one of the following conditions must be met: (1) Along the first direction, the distance between the center of the first adhesive area and the center of the first side is D1, which satisfies: D1≤0.1W; (2) Along the third direction, the distance between the center of the first bonding area and the center of the first side surface is D2, which satisfies: D2≤0.1L; (3) Along the first direction, the width of the first bonding area is S1, which satisfies: 0.1W≤S1≤0.85W; (4) Along the third direction, the length of the first bonding area is L1, which satisfies: 0.3L≤L1≤0.9L; (5) Along the first direction, the width of the first non-adhesive area is W1, which satisfies: 0.3W≤W1≤0.85W; (6) Along the third direction, the length of the first non-adhesive region is l1, which satisfies: 0.3L≤l1≤0.9L.

12. The electrochemical device according to claim 11, characterized in that, Along the first direction, the width of the second adhesive area bonded to the second region is H1, the distance between the second adhesive area and the first adhesive area is H2, the distance between the third adhesive area and the first adhesive area is H3, and the width of the third adhesive area bonded to the third region is H4; along the third direction, the length of the second adhesive area is L2, the length of the third adhesive area is L3, and the electrochemical device satisfies at least one of the following conditions: (1) H1 ≥ 0.05 W; (2) H1≤0.3W; (3) H4 ≥ 0.05 W; (4) H4 ≤ 0.3W; (5) H2 ≥ 0.05W1; (6) H2≤0.4W1; (7) H3 ≥ 0.05W1; (8) H3≤0.4W1; (9) L2 ≥ 0.4L1; (10) L3 ≥ 0.4L1.

13. An electrical appliance, characterized in that, Includes the electrochemical device as described in any one of claims 1 to 12.

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