Electrochemical apparatus and electric device

Abstract

An electrochemical apparatus and an electric device. The electrochemical apparatus comprises a housing, an electrode assembly, a first adhesive member, and a second adhesive member, wherein a first side wall of the housing comprises an internal first face and an external second face arranged opposite each other in a first direction; the electrode assembly is arranged in the housing, and the electrode assembly comprises a first side face; and the first adhesive member comprises a first side part and a second side part opposite each other, the first side part comprises a first adhesive area adhered to the first face, and the second side part comprises a second adhesive area, a first non-adhesive area and a third adhesive area arranged in sequence in a second direction, the second adhesive area and the third adhesive area being adhered to the first side face. In the first direction, the projection of the first non-adhesive area overlaps with the projection of the first adhesive area, and the second face is adhered to an external structure by means of the second adhesive member, thereby facilitating a suppression of the impact on the corner positions of a housing, and also facilitating a reduction in the risk of damage to electrode sheets of an electrode assembly.

Description

Electrochemical devices and electrical equipment Technical Field

[0001] This application relates to the field of energy storage technology, and in particular to an electrochemical device and an electrical appliance. Background Technology

[0002] When installing electrochemical devices such as batteries in the battery compartment of electrical equipment, the batteries are glued to the battery compartment to improve installation stability. In order to improve the failure problems such as internal short circuits and top seal breakage caused by the movement of internal electrode components during battery drops, the electrode components are glued to the battery casing to suppress the movement of the electrode components.

[0003] However, when electrical equipment is impacted, the battery as a whole is easily moved around, and the electrode components inside the battery are also easily moved around relative to the battery casing, which can easily damage the battery casing and the electrode plates of the electrode components.

[0004] Summary of the Invention

[0005] The inventors of this application discovered that placing the adhesive used to bond the electrode assembly and the housing, as well as the adhesive used to bond the housing to external structures such as the battery compartment, on the same side of the electrode assembly helps reduce overall battery movement; however, this makes the electrode plates of the electrode assembly more susceptible to damage. Conversely, placing the adhesive used to bond the electrode assembly and the housing, as well as the adhesive used to bond the housing to external structures such as the battery compartment, on different sides of the electrode assembly helps reduce the risk of damage to the electrode plates; however, this increases overall battery movement.

[0006] In view of this, this application provides an electrochemical device and an electrical device, which aims to suppress the overall movement of the battery and the movement of the electrode assembly relative to the casing, reduce the risk of damage to the casing and the risk of damage to the outer foil of the electrode assembly, and improve the safety and reliability of the electrochemical device.

[0007] In a first aspect, this application provides an electrochemical device. The electrochemical device includes a housing and a first sidewall. The first sidewall includes a first surface and a second surface opposite to each other along a first direction. The first surface is located inside the housing, and the second surface is located outside the housing. An electrode assembly is disposed inside the housing and includes a first side surface adjacent to the first surface. A first adhesive member is located between the housing and the electrode assembly. The first adhesive member includes opposing first and second side portions. The first side portion includes a first adhesive region bonded to the first surface. The second side portion includes a second adhesive region, a first non-adhesive region, and a third adhesive region sequentially disposed along a second direction. The second and third adhesive regions are bonded to the first side surface, and the second direction is perpendicular to the first direction. Along the first direction, the projection of the first non-adhesive region overlaps with the projection of the first adhesive region. The second adhesive member is bonded to the second surface and is configured to bond to an external structure.

[0008] This application uses a first adhesive area to bond to a first surface and a second adhesive to a second surface, so that both the first and second adhesives are located on one side of the electrode assembly along the first direction. This helps to suppress the overall movement of the electrochemical device relative to the external structure. The projection of the first non-adhesive area along the first direction overlaps with the projection of the first adhesive area along the first direction, which helps to reduce the impact force transmitted from the adhesive to the electrode assembly when the electrochemical device is subjected to impact, thereby reducing the risk of damage to the outer electrode sheet of the electrode assembly.

[0009] In one or more embodiments of this application, the first side portion further includes a second non-adhesive region and a third non-adhesive region, with the first adhesive region located between the second and third non-adhesive regions along a second direction. Along a first 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 reduces the tensile force of the first adhesive component on the first side portion when the electrochemical device is subjected to impact, thereby reducing the risk of damage to the outer electrode sheet of the electrode assembly.

[0010] In one or more embodiments of this application, along a first 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 second adhesive area, and the projection of the third non-adhesive area covers the third adhesive area. Along a second direction, the distance between the first adhesive area and the second adhesive area is greater than 0, and the distance between the first adhesive area and the third adhesive area is greater than 0. This arrangement allows the first adhesive component to have a portion that is neither bonded to the first surface nor to the first side surface. When the electrochemical device is subjected to impact, the force transmitted from the casing to the electrode assembly is absorbed through local deformation dissipation of the first adhesive component. This not only helps suppress relative movement between the electrode assembly and the casing but also further reduces the force transmitted from the first adhesive component to the first side surface, thereby reducing the risk of damage to the outer electrode sheet of the electrode assembly.

[0011] In one or more embodiments of this application, the electrochemical device further includes a first tab and a second tab with opposite polarities, which are connected to the electrode assembly and extend out of the housing in a second direction. This arrangement helps to suppress the movement of the electrode assembly relative to the housing in the second direction when the electrochemical device is subjected to impact, reducing impacts on the corners of the housing and on the head and tail positions of the electrode assembly, thereby reducing the risk of housing damage and short circuits in the electrochemical device.

[0012] In one or more embodiments of this application, the length of the electrode assembly is L along the second direction, and the width of the electrode assembly is W along the third direction. The first direction, the second direction, and the third direction are mutually perpendicular, W < L, and 30mm ≤ L ≤ 150mm, 25mm ≤ W ≤ 100mm. This arrangement is beneficial for increasing the area of ​​the electrode assembly that can be bonded by the first adhesive member, and also for providing an area corresponding to the first non-adhesive area. It is also beneficial for dispersing the pulling force of the first adhesive member on the electrode assembly, thereby reducing the risk of damage to the outer electrode sheet of the electrode assembly.

[0013] In one or more embodiments of this application, the distance between the first bonding area and the second bonding area is D1, where 0.5mm ≤ D1 ≤ 14mm. This ensures that the distance between the first and second bonding areas is not too long, which helps to suppress the movement of the electrode assembly relative to the housing. It also ensures that the distance between the first and second bonding areas is not too short, which helps to reduce the tensile force transmitted from the first adhesive to the electrode assembly, and thus reduces the risk of damage to the outer electrode sheet of the electrode assembly.

[0014] In one or more embodiments of this application, along the second direction, the distance between the first bonding area and the third bonding area is D2, where 0.5mm ≤ D2 ≤ 14mm. This ensures that the distance between the first and third bonding areas is not too long, which helps to suppress the movement of the electrode assembly relative to the housing. It also ensures that the distance between the first and third bonding areas is not too short, which helps to reduce the tensile force transmitted from the first adhesive to the electrode assembly, and thus reduces the risk of damage to the outer electrode sheet of the electrode assembly.

[0015] In one or more embodiments of this application, the projections of the first adhesive and the second adhesive overlap along the first direction, which is beneficial for suppressing the movement of the electrode assembly when the electrochemical device is subjected to impact.

[0016] In one or more embodiments of this application, along a first direction, the projection of the second adhesive element covers the projection of the first adhesive element. This is beneficial to increasing the overlapping area of ​​the projections of the first and second adhesive elements, and further beneficial to suppressing the movement of the electrode assembly when the electrochemical device is subjected to an impact.

[0017] In one or more embodiments of this application, along the first direction, the projected area of ​​the first adhesive is A, and the overlapping area between the projections of the first adhesive and the second adhesive is S, where 0.4 ≤ S / A ≤ 1. This arrangement ensures that the projected areas of the first adhesive and the second adhesive along the first direction at least partially overlap, which is beneficial for further improving the suppression of electrode component movement when the electrochemical device is subjected to impact.

[0018] In one or more embodiments of this application, the length of the electrode assembly is L along the second direction, and the width of the housing is W along the third direction. The first direction, the second direction, and the third direction are perpendicular to each other. Along the second direction, the length of the first adhesive member is L1, where 0.4L ≤ L1 ≤ 0.9L.

[0019] In one or more embodiments of this application, the length of the electrode assembly is L along the second direction, and the width of the housing is W along the third direction, with the first direction, second direction, and third direction being perpendicular to each other. Along the third direction, the width of the first adhesive member is W1, where 0.4W ≤ W1 ≤ 0.9W.

[0020] In one or more embodiments of this application, the first adhesive element includes a substrate layer, a first adhesive layer, a second adhesive layer, and a third adhesive layer. The first adhesive layer is bonded to the surface of the substrate layer facing the housing, and the second and third adhesive layers are bonded to the surfaces of the substrate layer facing the electrode assembly. The first adhesive layer includes a first adhesive region, the second adhesive layer includes a second adhesive region, and the third adhesive layer includes a third adhesive region. This arrangement allows for bonding between the housing and the electrode assembly without the need for multiple adhesive tapes, which helps reduce the overall thickness of the electrochemical device and improves its energy density.

[0021] In one or more embodiments of this application, the first 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 bonding surface and a first non-bonding surface, the first bonding surface including a fourth bonding area, a fifth bonding area, and a first bonding area. The second single-sided adhesive includes a second bonding surface and a second non-bonding surface, the second bonding surface including a sixth bonding area and a second bonding area, the sixth bonding area and the fourth bonding area being bonded together. The third single-sided adhesive includes a third bonding surface and a third non-bonding surface, the third bonding surface including a seventh bonding area and a third bonding area, the seventh bonding area and the fifth bonding area being bonded together. Thus, by bonding the first single-sided adhesive, the second single-sided adhesive, and the third single-sided adhesive together, the first adhesive component 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, offering advantages such as simple operation, high efficiency, and low cost. Furthermore, the portion of the second single-sided adhesive with the sixth bonding area and the portion of the third single-sided adhesive with the seventh bonding area can further buffer the tensile force of the housing through deformation, thereby further reducing the risk of tearing of the outer electrode sheet of the electrode assembly.

[0022] In one or more embodiments of this application, the electrode assembly further includes a second side, a third side, and a fourth side. The second side is disposed opposite to the first side along a first direction, and the third side is disposed opposite to the fourth side along a second direction. The second adhesive area is bonded to both the first and third sides. This arrangement allows the first adhesive to transfer the tensile force of the housing to the third side of the electrode assembly. When the electrode assembly is a wound structure, the electrode sheet located on the arc-shaped third side is more likely to disperse the force transferred by the adhesive, thereby reducing the risk of damage to the outer electrode sheet of the electrode assembly. When the electrode assembly is a stacked structure, the adhesive is bonded to the edge of the separator, positive electrode sheet, or negative electrode sheet on the third side, which is less likely to damage the electrode sheet of the electrode assembly and helps to suppress the relative sliding between the separator and the positive or negative electrode sheet.

[0023] In one or more embodiments of this application, the electrode assembly further includes a second side, a third side, and a fourth side. The second side is disposed opposite to the first side along a first direction, and the third side is disposed opposite to the fourth side along a second direction. The third adhesive area is bonded to both the first and fourth sides. This arrangement allows the first adhesive to transfer the tensile force of the housing to the fourth side of the electrode assembly. When the electrode assembly is a wound structure, the electrode sheet located on the arc-shaped fourth side is more likely to disperse the force transferred by the adhesive, which helps to reduce the risk of damage to the outer electrode sheet of the electrode assembly. When the electrode assembly is a stacked structure, the adhesive is bonded to the edge of the separator, positive electrode sheet, or negative electrode sheet on the fourth side, which is less likely to damage the electrode sheet of the electrode assembly and helps to suppress the relative sliding between the separator and the positive or negative electrode sheet.

[0024] A second aspect of this application provides an electrical device including the electrochemical device in any of the above embodiments. The risk of the electrochemical device shifting during drop tests and the risk of damage to the electrode components are reduced, thereby improving the reliability of the electrical device. Attached Figure Description

[0025] Figure 1 is a schematic diagram of the structure of an electrochemical device provided in an embodiment of this application.

[0026] Figure 2 is a schematic diagram of the decomposition of the electrochemical device in Figure 1.

[0027] Figure 3 is a cross-sectional view of an electrochemical device provided in an embodiment of this application.

[0028] Figure 4 is a cross-sectional view of the electrochemical device and external structure after bonding according to an embodiment of this application.

[0029] Figure 5 is a cross-sectional view of a first adhesive element provided in another embodiment of this application.

[0030] Figure 6 is a top view of a first adhesive and electrode assembly provided in an embodiment of this application.

[0031] Figure 7 is a side view of a first adhesive element provided in another embodiment of this application.

[0032] Figure 8 is a side view of a first adhesive element provided in another embodiment of this application.

[0033] Figure 9 is a cross-sectional view of an electrochemical device provided in another embodiment of this application.

[0034] Figure 10 is a side view of a first adhesive element provided in another embodiment of this application.

[0035] Figure 11 is a schematic diagram of an electrical device provided in an embodiment of this application.

[0036] Key Component Symbols: Electrochemical Device 100; Housing 10; First Sidewall 11; First Surface 111; Second Surface 112; Second Sidewall 12; Third Sidewall 13; Fourth Sidewall 14; Fifth Sidewall 15; Sixth Sidewall 16; Electrode Assembly 20; First Side 21; Second Side 22; Third Side 23; Fourth Side 24; First Adhesive 30; First Side 31; First Adhesive Area 311; Second Non-Adhesive Area 312; Third Non-Adhesive Area 313; Substrate Layer 301; First Substrate Section 3011; Second Substrate Section 3012; First Adhesive Layer 302; Second Adhesive Layer 303; Third Adhesive Layer 304; Second Side 32; Second Adhesive Area 321; First Non-Adhesive Area 322; Third Adhesive Area 323; First Single-Sided Adhesive 33; First Adhesive Surface331 Fourth bonding area; 3311 Fifth bonding area; 3312 First non-bonding surface; 332 Second single-sided adhesive; 34 Second bonding surface; 341 Sixth bonding area; 3411 Second non-bonding surface; 342 Third single-sided adhesive; 35 Third bonding surface; 351 Seventh bonding area; 3511 Third non-bonding surface; 352 Second bonded component; 40 First electrode tab; 50 Second electrode tab; 60 Head; 101 Tail; 102 Equipment body; 200 Electrical equipment; 1000 First direction X; Second direction Y; Third direction Z. Detailed Implementation

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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".

[0042] 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.

[0043] 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.

[0044] 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.

[0045] Please refer to Figures 1 and 2. An embodiment of this application provides an electrochemical device 100, which includes a housing 10 and an electrode assembly 20 disposed within the housing 10.

[0046] In some embodiments, referring to Figures 1, 3, and 4, the housing 10 includes a first sidewall 11. The first sidewall 11 includes a first surface 111 and a second surface 112 disposed opposite to each other along a first direction X. The first surface 111 is located inside the housing 10, and the second surface 112 is located outside the housing 10. Along the first direction X, the electrode assembly 20 is located on one side of the first sidewall 11.

[0047] In some embodiments, referring to Figures 1 and 3, the housing 10 includes a second sidewall 12, and the first sidewall 11 and the second sidewall 12 are disposed opposite each other along a first direction X. Along the first direction X, the electrode assembly 20 is located between the first sidewall 11 and the second sidewall 12.

[0048] In some embodiments, referring to Figures 1 and 3, the housing 10 includes a third sidewall 13 and a fourth sidewall 14, which are disposed opposite to each other along a second direction Y, which is perpendicular to the first direction X.

[0049] In some embodiments, referring to Figures 1 and 3, the housing 10 includes a fifth sidewall 15 and a sixth sidewall 16, which are disposed opposite each other along a third direction Z, and the first direction X, the second direction Y, and the third direction Z are perpendicular to each other. 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 accommodating the electrode assembly 20.

[0050] In some embodiments, the housing 10 is a flexible housing 10, which includes, but is not limited to, an aluminum-plastic film.

[0051] In some embodiments, the housing 10 contains an electrolyte (not shown), which includes a lithium salt and a solvent. The lithium salt may include at least one of LiPF6, LiBF6, LiClO, LiB(CH3), LiCHSO4, LiCFSO4LiN(SOCF), LiC(SOCF), or LiBOB. The solvent may be a carbonate compound, a carboxylic acid ester compound, an ether compound, other organic solvents, or a combination thereof.

[0052] In some embodiments, referring to Figures 2 and 3, the electrode assembly 20 includes a first side surface 21 adjacent to the first surface 111.

[0053] In some embodiments, please refer to FIG3, the electrode assembly 20 includes a second side surface 22 along a first direction X, the first side surface 21 is disposed opposite to the second side surface 22, and the second side surface 22 is adjacent to the second sidewall 12.

[0054] In some embodiments, the electrode assembly 20 includes a third side 23 and a fourth side 24, the third side 23 and the fourth side 24 being disposed opposite each other along the second direction Y.

[0055] In some embodiments, the electrode assembly 20 is a wound structure, and the third side 23 and the fourth side 24 are arc-shaped sides.

[0056] 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.

[0057] 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.

[0058] In some embodiments, a portion of the positive current collector has a positive active material layer, while a portion of the positive current collector does not have a positive active material layer. A portion of the negative current collector has a negative active material layer, while a portion of the negative current collector does not have a negative active material layer.

[0059] 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.

[0060] 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.

[0061] In some embodiments, the separator is an insulating film material such as a polyethylene film, a polypropylene film, a polyester film, or a polyimide film.

[0062] In some embodiments, referring to Figures 3 to 5, the electrochemical device 100 includes a first adhesive member 30 and a second adhesive member 40. The first adhesive member 30 is located between the housing 10 and the electrode assembly 20, and includes a first side portion 31 and a second side portion 32 opposite to each other. The first side portion 31 includes a first adhesive region 311 bonded to a first surface 111, and the second side portion 32 includes a second adhesive region 321, a first non-adhesive region 322, and a third adhesive region 323 sequentially disposed along a second direction Y. The second adhesive region 321 and the third adhesive region 323 are bonded to the first side surface 21, and the second direction Y is perpendicular to the first direction X. Along the first direction X, the projection of the first non-adhesive region 322 overlaps with the projection of the first adhesive region 311. The second adhesive member 40 is bonded to the second surface 112, and the second adhesive member 40 is configured to bond to an external structure.

[0063] In this application, the first adhesive region 311 of the first adhesive member 30 is bonded to the first surface 111, and the second adhesive member 40 is bonded to the second surface 112, so that both the first adhesive member 30 and the second adhesive member 40 are located on one side of the electrode assembly 20 along the first direction X, which helps to suppress the overall movement of the electrochemical device 100 relative to the external structure. The projection of the first non-adhesive region 322 along the first direction X overlaps with the projection of the first adhesive region 311 along the first direction X, which helps to reduce the impact force transmitted from the adhesive members to the electrode assembly 20 when the electrochemical device 100 is subjected to impact, thereby helping to reduce the risk of damage to the outer electrode sheet of the electrode assembly 20.

[0064] In some embodiments, as shown in FIG4, the second side 22 is in direct contact with the second sidewall 12, which is beneficial to improving the space utilization rate within the housing 10 and the energy density of the electrochemical device 100.

[0065] In some embodiments, referring to Figures 4 and 5, the first side portion 31 further includes a second non-adhesive region 312 and a third non-adhesive region 313. Along the second direction Y, the first adhesive region 311 is located between the second non-adhesive region 312 and the third non-adhesive region 313. Along the first direction X, the projection of the second non-adhesive region 312 overlaps with the second adhesive region 321, and the projection of the third non-adhesive region 313 overlaps with the third adhesive region 323. This arrangement reduces the tensile force of the first adhesive member 30 on the first side portion 21 when the electrochemical device 100 is subjected to impact, thereby reducing the risk of damage to the outer electrode sheet of the electrode assembly 20.

[0066] In some embodiments, referring to Figures 4 and 5, along the first direction X, the projection of the first non-adhesive region 322 covers the projection of the first adhesive region 311, the projection of the second non-adhesive region 312 covers the second adhesive region 321, and the projection of the third non-adhesive region 313 covers the third adhesive region 323. Along the second direction Y, the distance between the first adhesive region 311 and the second adhesive region 321 is greater than 0, and the distance between the first adhesive region 311 and the third adhesive region 323 is greater than 0. This arrangement allows the first adhesive member 30 to have a portion that is neither bonded to the first surface 111 nor to the first side surface 21. When the electrochemical device 100 is subjected to impact, the force transmitted from the housing 10 to the electrode assembly 20 is absorbed through the local deformation dissipation of the first adhesive member 30. This not only helps to suppress relative movement between the electrode assembly 20 and the housing 10, but also further reduces the force transmitted from the first adhesive member 30 to the first side surface 21, thereby reducing the risk of damage to the outer electrode sheet of the electrode assembly 20.

[0067] In some embodiments, referring to Figures 1 to 4, the electrochemical device 100 further includes a first tab 50 and a second tab 60 with opposite polarities. The first tab 50 and the second tab 60 are connected to the electrode assembly 20 and extend out of the housing 10 in the second direction Y. The side of the electrochemical device 100 where the first tab 50 and the second tab 60 extend is defined as the head 101, and the side of the electrochemical device 100 opposite to the head 101 is defined as the tail 102. This arrangement, where the second non-adhesive region 312, the first adhesive region 311, and the third non-adhesive region 313 are arranged sequentially along the direction from the head 101 to the tail 102 or from the tail 102 to the head 101 of the electrochemical device 100, and the second adhesive region 321, the first non-adhesive region 322, and the third adhesive region 323 are arranged sequentially along the direction from the head 101 to the tail 102 or from the tail 102 to the head 101 of the electrochemical device 100, helps to suppress the movement of the electrode assembly 20 relative to the housing 10 along the second direction Y when the electrochemical device 100 is impacted. This helps to reduce the impact on the corners of the housing 10 and the impact on the electrode assembly 20 near the head 101 and tail 102, thereby reducing the risk of damage to the housing 10 and short circuit of the electrochemical device 100.

[0068] It should be noted that in embodiments where the electrode assembly 20 has a wound structure, along the second direction Y, both the side of the electrode assembly 20 near the head 101 and the side near the tail 102 adopt an overhang design (along the second direction Y, the negative electrode extends beyond the cathode electrode). When the electrode assembly 20 moves along the second direction Y, it impacts the free electrolyte near the head 101 and tail 102 of the housing 10. By sequentially arranging the second bonding area 321, the first non-bonding area 322, and the third bonding area 323 along the second direction Y, and sequentially arranging the second non-bonding area 312, the first bonding area 311, and the third non-bonding area 313 along the second direction Y, it is beneficial to suppress the movement of the electrode assembly 20 relative to the housing 10 along the second direction Y and the impact on the free electrolyte near the head 101 and tail 102 of the housing 10. It is also beneficial to suppress the impact on the negative electrode and the separator near the head 101 and tail 102 of the electrode assembly 20, thereby reducing the risk of short circuit.

[0069] In some embodiments, the first tab 50 is connected to the positive electrode plate, and the polarity of the first tab 50 is positive. The second tab 60 is connected to the negative electrode plate, and the polarity of the second tab 60 is negative.

[0070] In other embodiments, the first tab 50 is connected to the negative electrode plate, and the polarity of the first tab 50 is negative. The second tab 60 is connected to the positive electrode plate, and the polarity of the second tab 60 is positive.

[0071] In some embodiments, referring to FIG1, the length of the electrode assembly 20 is L along the second direction Y, and the width of the electrode assembly 20 is W along the third direction Z. The first direction X, the second direction Y, and the third direction Z are perpendicular to each other, and W < L.

[0072] In the embodiment where the second bonding area 321, the first non-bonding area 322, and the third bonding area 323 are arranged sequentially along the second direction Y, the length L of the housing 10 along the second direction Y is greater than the width W of the housing 10 along the third direction Z. This is beneficial for increasing the area of ​​the electrode assembly 20 for the first adhesive member 30 to bond, and also beneficial for providing an area corresponding to the first non-bonding area 322. This is beneficial for dispersing the pulling force of the first adhesive member 30 on the electrode assembly 20, thereby reducing the risk of damage to the outer ring electrode sheet of the electrode assembly 20.

[0073] In some embodiments, W < L, and 30mm ≤ L ≤ 150mm, 25mm ≤ W ≤ 100mm.

[0074] As an example, L can be any one of 30mm, 31mm, 32mm, 33mm, 34mm, 35mm, 40mm, 45mm, 50mm, 55mm, 60mm, 65mm, 70mm, 75mm, 80mm, 85mm, 90mm, 95mm, 100mm, 105mm, 110mm, 115mm, 120mm, 125mm, 130mm, 135mm, 140mm, 145mm, 146mm, 147mm, 148mm, 149mm, or 150mm, or any value of both.

[0075] As an example, W can be any one of 25mm, 26mm, 27mm, 28mm, 29mm, 30mm, 31mm, 32mm, 33mm, 34mm, 35mm, 40mm, 45mm, 50mm, 55mm, 60mm, 65mm, 70mm, 75mm, 80mm, 85mm, 90mm, 95mm, 96mm, 97mm, 98mm, 99mm, or 100mm, or any value of both.

[0076] In some embodiments, referring to Figures 4 and 5, the distance between the first bonding area 311 and the second bonding area 321 along the second direction Y is D1, where 0.5mm ≤ D1 ≤ 14mm. When 0.5mm ≤ D1 ≤ 14mm, the distance between the first bonding area 311 and the second bonding area 321 is not too long, which helps to suppress the movement of the electrode assembly 20 relative to the housing 10. It also ensures that the distance between the first bonding area 311 and the second bonding area 321 is not too short, which helps to reduce the tensile force transmitted from the first adhesive member 30 to the electrode assembly 20, and helps to reduce the risk of damage to the outer electrode sheet of the electrode assembly 20.

[0077] As an example, D1 can be any one of 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 9.5mm, 9.6mm, 9.7mm, 9.8mm, 9.9mm, 10mm, 11mm, 12mm, 13mm, 13.1mm, 13.2mm, 13.3mm, 13.4mm, 13.5mm, 13.6mm, 13.7mm, 13.8mm, 13.9mm, or 14mm, or any value of both.

[0078] In some embodiments, referring to Figures 4 and 5, the distance between the first bonding area 311 and the third bonding area 323 along the second direction Y is D2, where 0.5mm ≤ D2 ≤ 14mm. When 0.5mm ≤ D2 ≤ 14mm, the distance between the first bonding area 311 and the third bonding area 323 is not too long, which helps to suppress the movement of the electrode assembly 20 relative to the housing 10. It also ensures that the distance between the first bonding area 311 and the third bonding area 323 is not too short, which helps to reduce the tensile force transmitted from the first adhesive member 30 to the electrode assembly 20, and helps to reduce the risk of damage to the outer electrode sheet of the electrode assembly 20.

[0079] As an example, D2 can be any one of 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 9.5mm, 9.6mm, 9.7mm, 9.8mm, 9.9mm, 10mm, 11mm, 12mm, 13mm, 13.1mm, 13.2mm, 13.3mm, 13.4mm, 13.5mm, 13.6mm, 13.7mm, 13.8mm, 13.9mm, or 14mm, or any value of both.

[0080] In some embodiments, referring to FIG6, the distance between the center of the first adhesive 30 and the center of the electrode assembly 20 along the second direction Y is D3, where D3≤0.1L, which helps to suppress the movement of the electrode assembly 20 and reduce the risk of damage to the outer electrode sheet of the electrode assembly 20.

[0081] As an example, D3 can be any one of 0, 0.01L, 0.02L, 0.03L, 0.04L, 0.05L, 0.06L, 0.07L, 0.08mm, 0.09L, or 0.1L, or any value of both.

[0082] In some embodiments, referring to FIG6, the length of the electrode assembly 20 is L along the second direction Y, the width of the electrode assembly 20 is W along the third direction Z, and the length of the first adhesive 30 is L1 along the second direction Y, where 0.4L≤L1≤0.9L. This arrangement helps to suppress the movement of the electrode assembly 20 and also helps to reduce the risk of damage to the outer electrode sheet of the electrode assembly 20.

[0083] As an example, L1 can be any one of 0.4L, 0.45L, 0.5L, 0.55L, 0.6L, 0.65L, 0.7L, 0.75L, 0.8L, 0.85L, or 0.9L, or any value of both.

[0084] In some embodiments, referring to FIG6, the length of the electrode assembly 20 is L along the second direction Y, the width of the electrode assembly 20 is W along the third direction Z, and the width of the first adhesive 30 is W1 along the third direction Z, where 0.4W≤W1≤0.9W. This arrangement helps to suppress the movement of the electrode assembly 20 and also helps to reduce the risk of damage to the outer electrode sheet of the electrode assembly 20.

[0085] As an example, W1 can be any one of 0.4W, 0.45W, 0.5W, 0.55W, 0.6W, 0.65W, 0.7W, 0.75W, 0.8W, 0.85W, or 0.9W, or any value of both.

[0086] In some embodiments, referring to FIG4, the projections of the first adhesive 30 and the second adhesive 40 overlap along the first direction X, which is beneficial to suppressing the movement of the electrode assembly 20 when the electrochemical device 100 is subjected to an impact.

[0087] In some embodiments, referring to FIG4, along the first direction X, the projection of the second adhesive 40 covers the projection of the first adhesive 30, which is beneficial to increase the overlapping area of ​​the projection of the first adhesive 30 and the projection of the second adhesive 40, and further beneficial to suppress the movement of the electrode assembly 20 when the electrochemical device 100 is subjected to impact.

[0088] In some embodiments, along the first direction X, the projected area of ​​the first adhesive 30 is A, and the overlapping area between the projections of the first adhesive 30 and the second adhesive 40 is S, where 0.4 ≤ S / A ≤ 1. This configuration ensures that the projected areas of the first adhesive 30 and the second adhesive 40 along the first direction X at least partially overlap, which is beneficial for further improving the suppression of the movement of the electrode assembly 20 when the electrochemical device 100 is subjected to impact.

[0089] As an example, S / A can be any one of 0.4, 0.41, 0.42, 0.43, 0.44, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, 0.96, 0.97, 0.98, 0.99, or 1, or any value of both.

[0090] In some embodiments, referring to FIG5, the first adhesive layer 30 includes a substrate layer 301, a first adhesive layer 302, a second adhesive layer 303, and a third adhesive layer 304. The first adhesive layer 302 is connected to the surface of the substrate layer 301 facing the housing 10. The second adhesive layer 303 and the third adhesive layer 304 are connected to the surface of the substrate layer 301 facing the electrode assembly 20. The first adhesive layer 302 includes a first adhesive area 311, the second adhesive layer 303 includes a second adhesive area 321, and the third adhesive layer 304 includes a third adhesive area 323. This arrangement allows for bonding between the housing 10 and the electrode assembly 20 without the need for multiple adhesive tapes, which helps reduce the overall thickness of the electrochemical device 100 and improves the energy density of the electrochemical device 100.

[0091] Understandably, the first adhesive layer 302, the second adhesive layer 303, and the third adhesive layer 304 can be formed by coating an adhesive substance onto a predetermined area of ​​the substrate layer 301; or the first adhesive layer 302, the second adhesive layer 303, and the third adhesive layer 304 can be formed by coating the substrate layer 301 with adhesive substance on both sides and then removing the adhesive substance from a portion of the substrate layer 301.

[0092] In some embodiments, the material of the substrate layer 301 may include any one of PET (polyethylene terephthalate), PVC (polyvinyl chloride), or PI (polyimide).

[0093] In some embodiments, referring to FIG5, a portion of the surface of the substrate layer 301 facing the electrode assembly 20 is exposed to form a first non-adhesive region 322; a portion of the surface of the substrate layer 301 facing the housing 10 is exposed to form a second non-adhesive region 312 and a third non-adhesive region 313. This arrangement allows for the absence of bonding a portion of the first adhesive element 30 to the first surface 111 of the housing 10 and a portion of the first adhesive element 30 to the first side surface 21 of the electrode assembly 20 without the need for multiple adhesive tapes. This facilitates a reduction in the overall thickness of the electrochemical device 100 and an increase in its energy density.

[0094] Understandably, a masking material can be pre-applied to the surface of the substrate layer 301, and then the adhesive material can be applied to the substrate layer 301. After removing the masking material, the surface previously covered with the masking material will form the first non-adhesive area 322, the second non-adhesive area 312, and the third non-adhesive area 313, which are exposed without the adhesive material. Alternatively, the adhesive material can be applied to both sides of the substrate layer 301 and then the adhesive material can be removed from a local surface, so that the surface of the substrate layer 301 where the adhesive material has been removed is exposed, forming the first non-adhesive area 322, the second non-adhesive area 312, and the third non-adhesive area 313.

[0095] In some embodiments, referring to FIG7, the substrate layer 301 includes a first substrate portion 3011 and a second substrate portion 3012, both of which are independent parts. The first substrate portion 3011 is provided with a second adhesive layer 303 and a portion of a first adhesive layer 302, while the second substrate portion 3012 is provided with a third adhesive layer 304 and a portion of the first adhesive layer 302. The first substrate portion 3011 and the second substrate portion 3012 are arranged at intervals along a second direction Y. This helps to reduce the risk of damage to the outer electrode sheet of the electrode assembly 20.

[0096] In some other embodiments, the first substrate portion 3011 and the second substrate portion 3012 are arranged along a third direction Z. This helps to reduce the risk of damage to the outer electrode sheet of the electrode assembly 20.

[0097] Understandably, the surface of the first substrate portion 3011 facing the first region and the surface of the second substrate portion 3012 facing the first region together form the first non-adhesive region 322.

[0098] In some embodiments, referring to FIG8, the first adhesive 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, and the first adhesive surface 331 includes a fourth adhesive region 3311, a fifth adhesive region 3312, and a first adhesive region 311. The second single-sided adhesive 34 includes a second adhesive surface 341 and a second non-adhesive surface 342, and the second adhesive surface 341 includes a sixth adhesive region 3411 and a second adhesive region 321, which are bonded to the fourth adhesive region 3311. The third single-sided adhesive 35 includes a third adhesive surface 351 and a third non-adhesive surface 352, and the third adhesive surface 351 includes a seventh adhesive region 3511 and a third adhesive region 323, which are bonded to the fifth adhesive region 3312.

[0099] By bonding the first single-sided adhesive 33, the second single-sided adhesive 34, and the third single-sided adhesive 35 together, the first adhesive component 30 can form a first adhesive area 311, a second adhesive area 321, a third adhesive area 323, a first non-adhesive area 322, a second non-adhesive area 312, and a third non-adhesive area 313. This method is simple to operate, efficient, and low in cost. Furthermore, the portion of the second single-sided adhesive 34 with a sixth adhesive area 3411 and the portion of the third single-sided adhesive 35 with a seventh adhesive area 3511 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.

[0100] In some embodiments, referring to FIG9, the second adhesive area 321 is bonded to both the first side surface 21 and the third side surface 23. This arrangement enables the first adhesive member 30 to transfer the tensile force of the housing 10 to the third side surface 23 of the electrode assembly 20. When the electrode assembly 20 is a wound structure, the electrode sheet located on the arc-shaped third side surface 23 is more likely to disperse the force transferred by the adhesive member, thereby helping to reduce the risk of damage to the outer electrode sheet of the electrode assembly 20. When the electrode assembly 20 is a stacked structure, the adhesive member is bonded to the edge of the separator, positive electrode sheet or negative electrode sheet on the third side surface 23, which is less likely to damage the electrode sheet of the electrode assembly 20 and helps to suppress the relative sliding between the separator and the positive electrode sheet or negative electrode sheet.

[0101] In some embodiments, the third adhesive area 323 is bonded to both the first side surface 21 and the fourth side surface 24. This arrangement allows the first adhesive member 30 to transfer the tensile force of the housing 10 to the fourth side surface 24 of the electrode assembly 20. When the electrode assembly 20 is a wound structure, the electrode sheet located on the arc-shaped fourth side surface 24 is more likely to disperse the force transferred by the adhesive member, which helps to reduce the risk of damage to the outer ring electrode sheet of the electrode assembly 20. When the electrode assembly 20 is a stacked structure, the adhesive member is bonded to the edge of the separator, positive electrode sheet or negative electrode sheet on the fourth side surface 24, which is less likely to damage the electrode sheet of the electrode assembly 20 and helps to suppress the relative sliding between the separator and the positive or negative electrode sheet.

[0102] In some embodiments, referring to FIG10, there are multiple first adhesive members 30, which are sequentially arranged along the second direction Y, and are integrally formed and connected. The integral forming of multiple first adhesive members 30 helps to increase the local area of ​​the adhesive members that is neither bonded to the first surface 111 nor to the first side surface 21. This allows the force transmitted from the housing 10 to the electrode assembly 20 when the electrochemical device 100 is subjected to impact to be absorbed through the local deformation dissipation of the multiple first adhesive members 30, thereby reducing the risk of damage to the outer electrode sheet of the electrode assembly 20.

[0103] Taking the first adhesive component 30, which includes a substrate layer 301, a first adhesive layer 302, a second adhesive layer 303, and a third adhesive layer 304, as an example, the substrate layers 301 of the two first adhesive components 30 are integrally formed, and the first adhesive layer 302 of one first adhesive component 30 and the third adhesive layer 304 of the other first adhesive component 30 are integrally formed.

[0104] In some other embodiments, there are multiple first adhesive members 30, each of which is an independent part, and the multiple first adhesive members 30 are arranged at intervals along the second direction Y.

[0105] It should be understood that when there are multiple first adhesive components 30, the sum of the distances D1 between the multiple first adhesive areas 311 and the second adhesive area 321 is in the range of 0.5mm-10mm, the sum of the distances D2 between the multiple first adhesive areas 311 and the third adhesive area 323 is in the range of 0.5mm-10mm, and the ratio of the overlapping area between the projection of the multiple first adhesive components 30 along the first direction X and the projection of the second adhesive component 40 along the first direction X to the projected area of ​​the multiple first adhesive components 30 along the first direction X is in the range of 0.4-1.

[0106] To verify the influence of each adhesive and non-adhesive region of the first adhesive component 30 on the electrochemical device 100, the following experiments were conducted:

[0107] 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.

[0108] In the comparative example, a double-sided adhesive tape with a length of 60.9 mm and a width of 38 mm is used as the first adhesive component 30 to bond the first surface 111 to the first side surface 21. A double-sided adhesive tape with a length of 60.9 mm and a width of 38 mm is used as the second adhesive component 40 to bond to the second surface 112.

[0109] In embodiments 1 to 15, the first tab 50 and the second tab 60 are connected to the electrode assembly 20 and extend out of the housing 10 along the second direction Y. The second adhesive area 321, the first non-adhesive area 322, and the third adhesive area 323 are sequentially arranged along the second direction Y, and the second non-adhesive area 312, the first adhesive area 311, and the third non-adhesive area 313 are sequentially arranged along the second direction Y. The number of the first adhesive component 30 and the second adhesive component 40 is one. The first adhesive component 30 includes a first adhesive layer 302, a second adhesive layer 303, a third adhesive layer 304, and a first adhesive area 311, a second adhesive area 321, and a third adhesive area 323. The first adhesive area 311 coincides with the center of the first side surface 21. The length of the first adhesive component 30 is 60.9 mm and the width is 38 mm. Double-sided adhesive with a length of 60.9 mm and a width of 38 mm is used as the second adhesive component 40.

[0110] The differences between Examples 1 to 15 are the values ​​in Table 1 below.

[0111] The parameters of the first adhesive 30 in the above embodiments are shown in Table 1 below.

[0112] 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 1.5m. 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 tears or damage to the outer electrode plates, were considered to have passed the test; otherwise, they were considered to have failed. Pass rate = (Number of passes / 20) × 100%.

[0113] Table 1

[0114] Referring to Table 1, compared to the comparative examples, in Examples 1-16, the first adhesive region 311 of the first adhesive member 30 is bonded to the first surface 111, and the second adhesive member 40 is bonded to the second surface 112. Both the first adhesive member 30 and the second adhesive member 40 are located on one side of the electrode assembly 20 along the first direction X. The projection of the first non-adhesive region 322 along the first direction X overlaps with the projection of the first adhesive region 311 along the first direction X. Examples 1-15 are beneficial for suppressing the overall movement of the electrochemical device 100 relative to the external structure. They are also beneficial for reducing the impact force transmitted to the electrode assembly 20 by the adhesive members when the electrochemical device 100 is subjected to impact, thereby reducing the risk of damage to the outer electrode sheet of the electrode assembly 20.

[0115] Referring to Table 1, compared to Embodiments 1 and 11, Embodiments 2-10 satisfy 0.5mm≤D1≤14mm and 0.5mm≤D2≤14mm. This ensures that the distance between the first bonding area 311 and the second bonding area 321 is not too long, and the distance between the first bonding area 311 and the third bonding area 323 is not too long, which helps to suppress the movement of the electrode assembly 20 relative to the housing 10. It also ensures that the distance between the first bonding area 311 and the second bonding area 321 is not too short, and the distance between the first bonding area 311 and the third bonding area 323 is not too short, which helps to reduce the tensile force transmitted from the first adhesive member 30 to the electrode assembly 20, and helps to reduce the risk of damage to the outer electrode sheet of the electrode assembly 20.

[0116] Referring to Table 1, compared to Example 12, Examples 13-16 satisfy 0.4≤S / A≤1, which allows the projection area of ​​the first adhesive 30 along the first direction X and the projection area of ​​the second adhesive 40 along the first direction X to have at least partial overlap, which is beneficial to further improve the suppression of the movement of the electrode assembly 20 when the electrochemical device 100 is subjected to impact.

[0117] Twenty batteries from each group were used in a drop test to compare their pass rates. The batteries were tested in a six-sided, four-corner drop sequence, with a drop height of 1.5m. The battery voltage was measured before the drop test.

[0118] Voltage drop test: After the voltage drop test, a 96-hour voltage monitoring period is required, with measurements taken every 24 hours for a total of 4 times. If any voltage drop exceeds 10mV, it is considered an internal short circuit failure, and the test is deemed a failure. If any voltage drop does not exceed 10mV, the test is passed. Pass rate = (Number of passes / 20) × 100%.

[0119] The difference between Examples 17 to 20 and Examples 1 to 16 is that the second adhesive area 321, the first non-adhesive area 322 and the third adhesive area 323 are arranged sequentially along the third direction Z, and the second non-adhesive area 312, the first adhesive area 311 and the third non-adhesive area 313 are arranged sequentially along the third direction Z.

[0120] Table 2

[0121] Referring to Table 2, compared to Examples 17-20, in Examples 13-16, the second bonding region 321, the first non-bonding region 322, and the third bonding region 323 are arranged sequentially along the second direction Y, and the second non-bonding region 312, the first bonding region 311, and the third non-bonding region 313 are arranged sequentially along the second direction Y. When the electrochemical device 100 is subjected to an impact, it is beneficial to suppress the displacement of the electrode assembly 20 relative to the housing 10 along the second direction Y, and to reduce the impact on the corners of the housing 10 and the impact on the electrode assembly 20 near the head 101 and tail 102, thereby reducing the risk of damage to the housing 10 and short circuit of the electrochemical device 100.

[0122] Please refer to Figure 11. An embodiment of this application also provides an electrical device 1000, which includes the electrochemical device 100 described above.

[0123] In some embodiments, referring to FIG11, the electrical device 1000 further includes a device body 200, and an electrochemical device 100 is installed on the device body 200 for supplying power to the device body 200.

[0124] 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.

[0125] 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.

[0126] 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 modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. An electrochemical device, characterized by, The electrochemical device comprises: a housing comprising a first side wall, the first side wall comprising a first face and a second face opposite to each other along a first direction, the first face being inside the housing, and the second face being outside the housing; an electrode assembly disposed in the housing, the electrode assembly comprising a first side face adjacent to the first face; a first adhesive disposed between the housing and the electrode assembly, the first adhesive comprising a first side and a second side opposite to each other, the first side comprising a first adhesive region adhered to the first face, and the second side comprising a second adhesive region, a first non-adhesive region, and a third adhesive region sequentially arranged along a second direction, the second adhesive region and the third adhesive region being adhered to the first side face, the second direction being perpendicular to the first direction; along the first direction, a projection of the first non-adhesive region overlaps a projection of the first adhesive region; a second adhesive adhered to the second face, the second adhesive being configured to adhere to an external structure.

2. The electrochemical device of claim 1, wherein The first side further comprises a second non-adhesive region and a third non-adhesive region, along the second direction, the first adhesive region is between the second non-adhesive region and the third non-adhesive region; along the first direction, a projection of the second non-adhesive region overlaps the second adhesive region, and a projection of the third non-adhesive region overlaps the third adhesive region.

3. The electrochemical device of claim 2, wherein along the first direction, the projection of the first non-adhesive region covers the projection of the first adhesive region, the projection of the second non-adhesive region covers the second adhesive region, and the projection of the third non-adhesive region covers the third adhesive region; along the second direction, a distance between the first adhesive region and the second adhesive region is greater than 0, and a distance between the first adhesive region and the third adhesive region is greater than 0.

4. The electrochemical device of claim 3, wherein The electrochemical device further comprises first and second polar tabs opposite in polarity, the first and second polar tabs being connected to the electrode assembly and extending out of the housing along the second direction.

5. The electrochemical device of claim 4, wherein The electrochemical device satisfies at least one of the following conditions: (1) along the second direction, a length of the electrode assembly is L, along a third direction, a width of the electrode assembly is W, the first direction, the second direction, and the third direction are perpendicular to each other, W < L, and 30 mm ≤ L ≤ 150 mm, 25 mm ≤ W ≤ 100 mm; (2) along the second direction, a distance between the first adhesive region and the second adhesive region is D1, and 0.5 mm ≤ D1 ≤ 14 mm; (3) along the second direction, a distance between the first adhesive region and the third adhesive region is D2, and 0.5 mm ≤ D2 ≤ 14 mm.

6. The electrochemical device according to any one of claims 1 to 5, wherein along the first direction, a projection of the first adhesive overlaps a projection of the second adhesive.

7. The electrochemical device of claim 6, wherein along the first direction, the projection of the second adhesive covers the projection of the first adhesive.

8. The electrochemical device according to claim 6 or 7, characterized by along the second direction, a length of the electrode assembly is L, along a third direction, a width of the electrode assembly is W, the first direction, the second direction, and the third direction are perpendicular to each other; In the first direction, a projected area of the first adhesive member is A, and an overlapping area between the projection of the first adhesive member and the projection of the second adhesive member is S, the electrochemical device satisfies at least one of the following conditions: (1) 0.4≤S / A≤1; (2) In the second direction, a length of the first adhesive member is L1, 0.4L≤L1≤0.9L; (3) In the third direction, a width of the first adhesive member is W1, 0.4W≤W1≤0.9W.

9. The electrochemical device according to any one of claims 1 to 8, wherein At least one of the following conditions is included: (1) The first adhesive member includes a substrate layer, a first adhesive layer, a second adhesive layer, and a third adhesive layer, the first adhesive layer is connected to a surface of the substrate layer facing the housing, the second adhesive layer and the third adhesive layer are connected to surfaces of the substrate layer facing the electrode assembly; the first adhesive layer includes the first adhesive region, the second adhesive layer includes the second adhesive region, and the third adhesive layer includes the third adhesive region; (2) The first adhesive member includes a first single-sided adhesive, a second single-sided adhesive, and a third single-sided adhesive, the first single-sided adhesive includes opposite first adhesive surfaces and first non-adhesive surfaces, the first adhesive surfaces include a fourth adhesive region, a fifth adhesive region, and the first adhesive region; the second single-sided adhesive includes opposite second adhesive surfaces and second non-adhesive surfaces, the second adhesive surfaces include a sixth adhesive region and the second adhesive region, and the sixth adhesive region and the fourth adhesive region are bonded; The third single-sided adhesive includes opposite third adhesive surfaces and third non-adhesive surfaces, the third adhesive surfaces include a seventh adhesive region and the third adhesive region, and the seventh adhesive region and the fifth adhesive region are bonded.

10. The electrochemical device of claim 1, wherein The electrode assembly further includes a second side, a third side, and a fourth side, the second side is arranged opposite to the first side in the first direction, the third side and the fourth side are arranged opposite in the second direction, and at least one of the following conditions is satisfied: (1) The second adhesive region is bonded to the first side and the third side; (2) The third adhesive region is bonded to the first side and the fourth side.

11. An electrical device, characterized by The electrochemical device as claimed in any one of claims 1 to 10 is included.

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