Electrochemical apparatus and electrical equipment

Abstract

This application discloses an electrochemical apparatus and electrical equipment, the electrochemical apparatus comprising a housing, an electrode assembly, a first adhesive, and a second adhesive. The first side wall of the housing includes an internal first surface and an external second surface facing each other in a first direction. The electrode assembly is provided within the housing and includes a first side surface. The first adhesive comprises a first side and a second side, the first side comprising a first adhesive region bonded to the first surface, and the second side comprising a second adhesive region, a first non-adhesive region, and a third adhesive region arranged sequentially along a second direction, the second and third adhesive regions being bonded to the first side surface. Along the first direction, the projection of the first non-adhesive region overlaps with the projection of the first adhesive region. The second surface is bonded to an external structure via the second adhesive. This application is advantageous for mitigating impacts on the corners of the housing and further advantageous for reducing the risk of damage to the electrode pieces of the electrode assembly.

Description

Technical Field

[0001] The present application relates to the field of energy storage technology, and in particular to electrochemical devices and electrical apparatuses.

Background Art

[0002] When an electrochemical device such as a battery is mounted in the battery compartment of an electrical apparatus, the battery is adhered to the battery compartment to improve mounting stability. In order to ameliorate failure problems such as internal short circuits caused by blow-by of the internal electrode assembly and piercing of the top seal when the battery is dropped, the electrode assembly is adhered to the battery housing to suppress blow-by of the electrode assembly.

[0003] However, when the electrical apparatus is subjected to an impact, the entire battery is impacted and prone to blow-by, the internal electrode assembly inside the battery is also prone to blow-by relative to the battery housing, resulting in the problem that the pole pieces of the battery housing and the electrode assembly are easily damaged.

Summary of the Invention

Problems to be Solved by the Invention

[0004] Through research, the inventors of the present application have found that when the adhesive that bonds the electrode assembly and the housing, and the adhesive that bonds the housing and the external structure such as the battery compartment are disposed on the same side of the electrode assembly, it is beneficial to reduce the blow-by of the entire battery, but the pole pieces of the electrode assembly are easily damaged. It has also been found that when the adhesive that bonds the electrode assembly and the housing, and the adhesive that bonds the housing and the external structure such as the battery compartment are disposed on different sides of the electrode assembly, it is beneficial to reduce the risk of damage to the pole pieces of the electrode assembly, but the blow-by of the entire battery increases.

[0005] In view of this, the present application provides an electrochemical device and an electrical apparatus, which aim to suppress the blow-by of the entire battery and the blow-by of the electrode assembly relative to the housing, reduce the risk of damage to the housing and the risk of damage to the outer peripheral foil material of the electrode assembly, and improve the safety and reliability of the electrochemical device.

Means for Solving the Problems

[0006] A first aspect of this application provides an electrochemical apparatus, the electrochemical apparatus including a housing, the housing including a first side wall, the first side wall including a first surface and a second surface facing each other in a first direction, the first surface located inside the housing and the second surface located outside the housing. An electrode assembly is provided inside the housing, the electrode assembly including a first side surface adjacent to the first surface. A first adhesive is located between the housing and the electrode assembly, the first adhesive includes a first side portion and a second side portion facing each other. The first side portion includes a first adhesive region that adheres to the first surface, the second side portion includes a second adhesive region, a first non-adhesive region and a third adhesive region arranged sequentially along a second direction, the second and third adhesive regions adhere to the first side portion, 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 is bonded to the second surface, and the second adhesive is configured to bond to the external structure.

[0007] This application is advantageous in suppressing blow-by to the external structure of the entire electrochemical apparatus by positioning both the first and second adhesives on one side along the first direction of the electrode assembly, as the first adhesive region of the first adhesive is bonded to the first surface and the second adhesive is bonded to the second surface. The projection of the first non-adhesive region along the first direction overlaps with the projection of the first adhesive region along the first direction, which is advantageous in reducing the impact force transmitted by the adhesive to the electrode assembly when the electrochemical apparatus is subjected to an impact, thereby advantageous in reducing the risk of damage to the outer electrode pieces of the electrode assembly.

[0008] In one or more embodiments of this application, the first side further includes a second non-adhesive region and a third non-adhesive region, and along the second direction, the first adhesive region is located between the second non-adhesive region and the third non-adhesive region. Along the 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 configuration reduces the tensile force exerted by the first adhesive on the first side when the electrochemical apparatus is subjected to impact, thereby reducing the risk of damage to the outer electrode pieces of the electrode assembly.

[0009] In one or more embodiments of the present application, 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, the distance between the first adhesive region and the second adhesive region is greater than 0, and the distance between the first adhesive region and the third adhesive region is greater than 0. With such a configuration, there exists a local portion in the first adhesive that does not adhere to the first surface nor to the first side surface. When the electrochemical device receives an impact, the force of the housing is dissipated and absorbed by the local deformation of the first adhesive in the process of being transmitted to the electrode assembly, which is on the basis advantageous for suppressing the relative blow-by between the electrode assembly and the housing, is beneficial for further reducing the force transmitted by the first adhesive to the first side surface, and thus is beneficial for reducing the risk of damage to the outer peripheral pole pieces of the electrode assembly.

[0010] In one or more embodiments of the present application, the electrochemical device further includes a first tab and a second tab with different polarities, the first tab and the second tab are connected to the electrode assembly and extend out of the housing along the second direction. With such a configuration, when the electrochemical device receives an impact, it is advantageous for suppressing the blow-by of the electrode assembly relative to the housing along the second direction, and is advantageous for reducing the impact on the corner portion of the housing and the impact on the vicinity of the head portion and the tail portion of the electrode assembly, thereby being beneficial for reducing the risk of damage to the housing and short circuit of the electrochemical device.

[0011] In one or more embodiments of the present application, the length of the electrode assembly along the second direction is L, the width of the electrode assembly along the third direction is W, the first direction, the second direction and the third direction are perpendicular to each other, W < L, and 30mm ≤ L ≤ 150mm, 25mm ≤ W ≤ 100mm. With such a configuration, it is beneficial for expanding the bonding area of the first adhesive on the electrode assembly, further beneficial for providing the area corresponding to the first non-adhesive region, and beneficial for dispersing the tensile force exerted by the first adhesive on the electrode assembly, thereby reducing the risk of damage to the outer peripheral pole pieces of the electrode assembly.

[0012] In one or more embodiments of this application, when the distance between the first adhesive region and the second adhesive region is D1, 0.5 mm ≤ D1 ≤ 14 mm. This prevents the offset distance between the first and second adhesive regions from becoming too long, which is advantageous in suppressing blow-by to the housing of the electrode assembly. At the same time, it prevents the offset distance between the first and second adhesive regions from becoming too short, which is advantageous in reducing the tensile force transmitted by the first adhesive to the electrode assembly, thereby reducing the risk of damage to the outer electrode pieces of the electrode assembly.

[0013] In one or more embodiments of this application, when D2 is the distance between the first adhesive region and the third adhesive region along the second direction, 0.5 mm ≤ D2 ≤ 14 mm. This prevents the offset distance between the first and third adhesive regions from becoming too long, which is advantageous in suppressing blow-by to the housing of the electrode assembly. Furthermore, it prevents the offset distance between the first and third adhesive regions from becoming too short, which is advantageous in reducing the tensile force transmitted by the first adhesive to the electrode assembly, and is advantageous in reducing the risk of damage to the outer electrode pieces of the electrode assembly.

[0014] In one or more embodiments of this application, the projection of the first adhesive and the projection of the second adhesive overlap along the first direction, which is advantageous in suppressing blow-by of the electrode assembly when the electrochemical apparatus is subjected to impact.

[0015] In one or more embodiments of this application, along a first direction, the projection of the second adhesive covers the projection of the first adhesive, which is advantageous in increasing the area of ​​the overlapping region between the projections of the first and second adhesives, and further advantageous in suppressing blow-by of the electrode assembly when the electrochemical apparatus is subjected to shock.

[0016] In one or more embodiments of this application, when the projected area of ​​the first adhesive is A along a first direction, and the overlapping area between the projection of the first adhesive and the projection of the second adhesive is S, then 0.4 ≤ S / A ≤ 1. This is advantageous because there exists an area where the projected region of the first adhesive along the first direction and the projected region of the second adhesive along the first direction overlap at least partially, thereby further enhancing the effect of suppressing blow-by of the electrode assembly when the electrochemical apparatus is subjected to an impact.

[0017] In one or more embodiments of this application, the length of the electrode assembly along the second direction is L, the width of the housing along the third direction is W, and the first, second, and third directions are perpendicular to each other. When the length of the first adhesive along the second direction is L1, 0.4L ≤ L1 ≤ 0.9L.

[0018] In one or more embodiments of this application, the length of the electrode assembly along the second direction is L, the width of the housing along the third direction is W, and the first, second, and third directions are perpendicular to each other. When the width of the first adhesive along the third direction is W1, 0.4W ≤ W1 ≤ 0.9W.

[0019] In one or more embodiments of this application, the first adhesive comprises a substrate layer, a first adhesive layer, a second adhesive layer, and a third adhesive layer. The first adhesive layer is connected to the surface of the substrate layer facing the housing, and the second and third adhesive layers are connected to the surface 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 configuration allows for bonding of the housing and electrode assembly without the need to combine multiple tapes, which is advantageous for reducing the overall thickness of the electrochemical apparatus and increasing the energy density of the electrochemical apparatus.

[0020] In one or more embodiments of this application, the first adhesive includes a first single-sided tape, a second single-sided tape, and a third single-sided tape. The first single-sided tape includes a first adhesive surface and a first non-adhesive surface facing each other, and the first adhesive surface includes a fourth adhesive region, a fifth adhesive region, and a first adhesive region. The second single-sided tape includes a second adhesive surface and a second non-adhesive surface facing each other, and the second adhesive surface includes a sixth adhesive region and a second adhesive region, with the sixth adhesive region and the fourth adhesive region being bonded. The third single-sided tape includes a third adhesive surface and a third non-adhesive surface facing each other, and the third adhesive surface includes a seventh adhesive region and a third adhesive region, with the seventh adhesive region and the fifth adhesive region being bonded. This allows the first adhesive material to form a first adhesive region, a second adhesive region, a third adhesive region, a first non-adhesive region, a second non-adhesive region, and a third non-adhesive region by bonding the first single-sided tape, the second single-sided tape, and the third single-sided tape to each other, offering the advantages of being easy to operate, efficient, and low-cost. Furthermore, the portion of the second single-sided tape with the sixth adhesive region and the portion of the third single-sided tape with the seventh adhesive region can further alleviate the tensile force on the housing through deformation, thereby further reducing the risk of tearing of the outer electrode pieces of the electrode assembly.

[0021] 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 being provided opposite the first side along a first direction, and the third side being provided opposite the fourth side along a second direction. The second adhesive region is bonded to both the first and third sides. With such a configuration, the first adhesive can transmit the tensile force of the housing to the third side of the electrode assembly, and if the electrode assembly is a wound structure, the pole pieces located on the arc-shaped third side are advantageous in that the force transmitted by the adhesive is easily dispersed, thereby reducing the risk of damage to the outer pole pieces of the electrode assembly, and if the electrode assembly is a laminated structure, the adhesive adheres to the edges of the separator, positive pole piece, or negative pole piece on the third side, making it less likely to damage the pole pieces of the electrode assembly and helping to suppress relative slippage of the separator with respect to the positive or negative pole piece.

[0022] In one or more embodiments of the present application, the electrode assembly further includes a second side surface, a third side surface, and a fourth side surface. The second side surface is disposed to face the first side surface along a first direction, and the third side surface is disposed to face the fourth side surface along a second direction. The third adhesive region is adhered to both the first side surface and the fourth side surface. With such a configuration, the first adhesive can transmit the tensile force of the housing to the fourth side surface of the electrode assembly. When the electrode assembly has a wound structure, the electrode tabs located on the arc-shaped fourth side surface can easily disperse the force transmitted by the adhesive, which is advantageous for reducing the risk of damage to the outer peripheral electrode tabs of the electrode assembly. When the electrode assembly has a laminated structure, the adhesive adheres to the edges of the separator, the positive electrode tab or the negative electrode tab on the fourth side surface, which hardly damages the electrode tabs of the electrode assembly, and helps to suppress the relative sliding of the separator with respect to the positive electrode tab or the negative electrode tab.

[0023] A second aspect of the present application provides an electrical device, which includes the electrochemical device according to any one of the above embodiments. The electrochemical device has reduced risk of blow-by and risk of electrode assembly damage in a drop test, thereby improving the operational reliability of the electrical device. [Brief Description of the Drawings]

[0024] [Figure 1] FIG. 1 is a schematic structural diagram of an electrochemical device according to an embodiment of the present application. [Figure 2] FIG. 2 is a schematic exploded view of the electrochemical device in FIG. 1. [Figure 3] FIG. 3 is a cross-sectional view of an electrochemical device according to an embodiment of the present application. [Figure 4] FIG. 4 is a cross-sectional view after the electrochemical device and the external structure are bonded according to an embodiment of the present application. [Figure 5] FIG. 5 is a cross-sectional view of a first adhesive according to another embodiment of the present application. [Figure 6] FIG. 6 is a plan view of a first adhesive and an electrode assembly according to an embodiment of the present application. [Figure 7] FIG. 7 is a side view of a first adhesive according to another embodiment of the present application. [Figure 8] FIG. 8 is a side view of the first adhesive according to still another embodiment of the present application. [Figure 9] FIG. 9 is a cross-sectional view of an electrochemical device according to another embodiment of the present application. [Figure 10] FIG. 10 is a side view of the first adhesive according to still another embodiment of the present application. [Figure 11] FIG. 11 is a schematic diagram of an electrical apparatus according to an embodiment of the present application. [Mode for Carrying Out the Invention]

[0025] Hereinafter, the technical solutions in the embodiments of the present application will be described, and it is apparent that the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments.

[0026] In the present application, the center of a certain region means that when the region is a continuous whole, the center of the region is the center of gravity of the planar shape of the region, and the center of gravity of the planar shape can be determined by the suspension method, that is, the planar shape is suspended by a thin line, a straight line is drawn in the vertical direction from the starting point of the thin line, the planar shape is suspended again at an endpoint different from the first one, another straight line is drawn according to the aforementioned method, and the intersection of the two straight lines is the center of gravity of the planar shape. When the region is composed of a plurality of discrete regions, the center of the region is the center of the minimum circumscribed circle that encloses the plurality of discrete regions. As can be understood, the minimum circumscribed circle refers to a circle that includes the plurality of discrete regions and has the smallest radius. As can be understood, when an assembly is considered to be "connected" to another assembly, it may be directly connected to the another assembly, or there may be other assemblies interposed therebetween. When an assembly is considered to be "disposed on" another assembly, it may be directly disposed on the another assembly, or there may be other assemblies interposed therebetween. The terms "top", "bottom" and similar expressions used in this text are used for illustrative purposes only.

[0027] Terms such as "first," "second," etc., are used solely to distinguish between different subjects and are not intended to indicate or imply opposing importance, or to implicitly indicate the quantity, specific order, or primary relationship of the technical features being referred to.

[0028] The term "perpendicular" is used to describe the ideal state between two members. In actual production or use, there may be a roughly perpendicular state between two members. The two members described as "perpendicular" do not necessarily have to be an absolute straight line or plane, but may be roughly straight line or plane, and macroscopically, if the overall direction of extension is a straight line or plane, the members can be considered "straight" or "plane".

[0029] The dimensions and thicknesses of each component shown in the drawings are provided for better understanding and easier explanation, and it should be recognized that this application is not limited to the dimensions and thicknesses shown in the drawings.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art. Terms used herein in the specification are solely for the purpose of describing specific embodiments and are not intended to limit this application.

[0031] Some embodiments of this application will be described below with reference to the drawings. To the extent that they do not contradict each other, the following embodiments and features can be combined with each other.

[0032] Referring to Figures 1 and 2, embodiments of the present application provide an electrochemical apparatus 100, which comprises a housing 10 and an electrode assembly 20, the electrode assembly 20 being housed within the housing 10.

[0033] In some embodiments, with reference to Figures 1, 3, and 4, the housing 10 includes a first side wall 11, which includes a first surface 111 and a second surface 112 facing a first direction X, the first surface 111 being located inside the housing 10 and the second surface 112 being located outside the housing 10. Along the first direction X, the electrode assembly 20 is located on one side of the first side wall 11.

[0034] In some embodiments, referring to Figures 1 and 3, the housing 10 includes a second side wall 12, and the first side wall 11 and the second side wall 12 are arranged opposite each other along a first direction X. Along the first direction X, the electrode assembly 20 is located between the first side wall 11 and the second side wall 12.

[0035] In some embodiments, referring to Figures 1 and 3, the housing 10 includes a third side wall 13 and a fourth side wall 14, the third side wall 13 and the fourth side wall 14 being opposite each other along a second direction Y, the second direction Y being perpendicular to a first direction X.

[0036] In some embodiments, referring to Figures 1 and 3, the housing 10 includes a fifth side wall 15 and a sixth side wall 16, the fifth side wall 15 and the sixth side wall 16 facing 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 side wall 11, the second side wall 12, the third side wall 13, the fourth side wall 14, the fifth side wall 15 and the sixth side wall 16 are formed surrounding a space for housing the electrode assembly 20.

[0037] In some embodiments, the housing 10 is a flexible housing 10, and the housing 10 includes, but is not limited to, an aluminum laminate film.

[0038] In some embodiments, the housing 10 is provided with an electrolyte (not shown), which comprises a lithium salt and a solvent, the lithium salt may include at least one of LiPF, LiBF, LiC1O, LiB(CH), LiCHSO, LiCFSOLiN(SOCF), LiC(SOCF), and LiBOB. The solvent may be a carbonate ester compound, a carboxylic acid ester compound, an ether compound, other organic solvents, or a combination thereof.

[0039] In some embodiments, with reference to Figures 2 and 3, the electrode assembly 20 includes a first side surface 21 adjacent to the first surface 111.

[0040] In some embodiments, referring to Figure 3, the electrode assembly 20 includes a second side surface 22, and along the first direction X, the first side surface 21 and the second side surface 22 are arranged opposite each other, with the second side surface 22 adjacent to the second side wall 12.

[0041] In some embodiments, the electrode assembly 20 includes a third side surface 23 and a fourth side surface 24, the third side surface 23 and the fourth side surface 24 being arranged opposite each other along the second direction Y.

[0042] In some embodiments, the electrode assembly 20 has a wound structure, and the third side surface 23 and the fourth side surface 24 are arc-shaped sides.

[0043] In some embodiments, the electrode assembly 20 includes a positive electrode piece, a negative electrode piece, and a separator, and the positive electrode piece, negative electrode piece, and separator may be arranged in a stacked manner to form a stacked structure, or the positive electrode piece, negative electrode piece, and separator may be wound after stacking to form a wound structure.

[0044] In some embodiments, the positive electrode piece includes a positive electrode current collector and a positive electrode active material layer provided on the positive electrode current collector. The negative electrode piece includes a negative electrode current collector and a negative electrode active material layer provided on the negative electrode current collector.

[0045] In some embodiments, a positive electrode active material layer is provided on a portion of the positive electrode current collector, while a positive electrode active material layer is not provided on a portion of the positive electrode current collector. A negative electrode active material layer is provided on a portion of the negative electrode current collector, while a negative electrode active material layer is not provided on a portion of the negative electrode current collector.

[0046] Of these, the positive electrode current collector and the negative electrode current collector may be metal layers. For example, the positive electrode current collector may be a metal layer containing at least one of aluminum, nickel, tantalum, and titanium, for example, aluminum foil. The positive electrode active material layer contains a positive electrode active material, which may contain at least one of lithium cobalt oxide, nickel cobalt manganese oxide lithium, nickel cobalt aluminate lithium, lithium iron phosphate, manganese iron phosphate lithium, or lithium manganese oxide. The negative electrode current collector may be a metal layer containing at least one of copper, nickel, tantalum, and titanium, for example, copper foil. The negative electrode active material layer contains a negative electrode active material, which may contain at least one of graphite, hard carbon, soft carbon, silicon, silicon oxide material, and silicon carbon material.

[0047] In some embodiments, the outermost periphery of the electrode assembly 20 is provided with a positive electrode current collector layer that does not have a positive electrode active material layer, and the positive electrode current collector is aluminum foil.

[0048] In some embodiments, the separator is an insulating film material such as polyethylene film, polypropylene film, polyester film, or polyimide film.

[0049] In some embodiments, referring to Figures 3 to 5, the electrochemical apparatus 100 includes a first adhesive 30 and a second adhesive 40. The first adhesive 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 facing each other. The first side portion 31 includes a first adhesive region 311 that adheres 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 arranged in order along a second direction Y, the second adhesive region 321 and the third adhesive region 323 adhering 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 40 is bonded to the second surface 112, and the second adhesive 40 is configured to bond to the external structure.

[0050] In this application, the first adhesive region 311 of the first adhesive material 30 is bonded to the first surface 111, and the second adhesive material 40 is bonded to the second surface 112, and both the first adhesive material 30 and the second adhesive material 40 are located on the side of the electrode assembly 20 along the first direction X, which is advantageous in suppressing blow-by to the external structure of the entire electrochemical apparatus 100. 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 is advantageous in reducing the impact force transmitted by the adhesive to the electrode assembly 20 when the electrochemical apparatus 100 is subjected to an impact, thereby advantageous in reducing the risk of damage to the outer electrode pieces of the electrode assembly 20.

[0051] In some embodiments, referring to Figure 4, the second side surface 22 is in direct contact with the second side wall 12, which is advantageous for increasing the utilization rate of space within the housing 10 and for increasing the energy density of the electrochemical apparatus 100.

[0052] 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, and 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. Such a configuration reduces the tensile force exerted by the first adhesive 30 on the first side portion 21 when the electrochemical apparatus 100 is subjected to impact, thereby reducing the risk of damage to the outer electrode pieces of the electrode assembly 20.

[0053] 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. With this configuration, there are localized areas in the first adhesive 30 that do not adhere to the first surface 111 or the first side surface 21. When the electrochemical apparatus 100 is subjected to an impact, the force from the housing 10 is dissipated and absorbed by the localized deformation of the first adhesive 30 as it is transmitted to the electrode assembly 20. This is advantageous in suppressing relative blow-by between the electrode assembly 20 and the housing 10, and further advantageous in reducing the force transmitted by the first adhesive 30 to the first side surface 21, thereby reducing the risk of damage to the outer electrode pieces of the electrode assembly 20.

[0054] In some embodiments, with reference to Figures 1 to 4, the electrochemical apparatus 100 further includes a first tab 50 and a second tab 60 with different polarities. The first tab 50 and the second tab 60 are connected to the electrode assembly 20 and extend from the housing 10 along a second direction Y, with the side of the electrochemical apparatus 100 from which the first tab 50 and the second tab 60 extend being defined as the head portion 101, and the side of the electrochemical apparatus 100 opposite the head portion 101 being defined as the tail portion 102. With this configuration, 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 portion 101 to the tail portion 102 of the electrochemical apparatus 100 or from the tail portion 102 to the head portion 101, 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 portion 101 to the tail portion 102 of the electrochemical apparatus 100 or from the tail portion 102 to the head portion 101. This configuration is advantageous in suppressing blow-by to the housing 10 along the second direction Y of the electrode assembly 20 when the electrochemical apparatus 100 is subjected to impact, and is advantageous in reducing impact to the corners of the housing 10 and to positions of the electrode assembly 20 close to the head portion 101 and tail portion 102, thereby reducing the risk of damage to the housing 10 and short circuits in the electrochemical apparatus 100.

[0055] In embodiments where the electrode assembly 20 has a wound structure, both the side of the electrode assembly 20 closer to the head portion 101 and the side closer to the tail portion 102 are designed with an overhang (the negative electrode piece extends beyond the positive electrode piece along the second direction Y), and when the electrode assembly 20 blows by along the second direction Y, the electrode assembly 20 impacts the free electrolyte near the head portion 101 and tail portion 102 of the housing 10. By providing the second adhesive region 321, the first non-adhesive region 322, and the third adhesive region 323 in order along the second direction Y, and the second non-adhesive region 312, the first adhesive region 311, and the third non-adhesive region 313 in order along the second direction Y, it is advantageous to suppress blow-by of the electrode assembly 20 against the housing 10 along the second direction Y, and impact on the free electrolyte near the head portion 101 and tail portion 102 of the housing 10, and is advantageous to suppress impact on the negative electrode piece and separator near the head portion 101 and tail portion 102 of the electrode assembly 20, thereby reducing the risk of short circuits.

[0056] In some embodiments, the first tab 50 is connected to the positive electrode piece, and the polarity of the first tab 50 is positive. The second tab 60 is connected to the negative electrode piece, and the polarity of the second tab 60 is negative.

[0057] In some other embodiments, the first tab 50 is connected to the negative electrode piece, and the polarity of the first tab 50 is negative. The second tab 60 is connected to the positive electrode piece, and the polarity of the second tab 60 is positive.

[0058] In some embodiments, referring to Figure 1, the length of the electrode assembly 20 along the second direction Y is L, and the width of the electrode assembly 20 along the third direction Z is W, and the first direction X, the second direction Y, and the third direction Z are perpendicular to each other, and W <Lである。

[0059] In the embodiment where the second bonding region 321, the first non-bonding region 322, and the third bonding region 323 are sequentially arranged 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, which is advantageous for enlarging the bonding area between the first adhesive 30 and the electrode assembly 20, further advantageous for providing the area corresponding to the first non-bonding region 322, and advantageous for dispersing the tensile force exerted by the first adhesive 30 on the electrode assembly 20, thereby reducing the risk of damage to the outer peripheral electrode plate of the electrode assembly 20.

[0060] In some embodiments, W < L, and 30mm ≦ L ≦ 150mm, 25mm ≦ W ≦ 100mm.

[0061] By way of example, L may 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 between the two. By way of example, W may 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 between the two.

[0062] In some embodiments, referring to Figures 4 and 5, when D1 is the distance between the first adhesive region 311 and the second adhesive region 321 along the second direction Y, 0.5 mm ≤ D1 ≤ 14 mm. When 0.5 mm ≤ D1 ≤ 14 mm, the displacement distance between the first adhesive region 311 and the second adhesive region 321 is not too long, which is advantageous in suppressing blow-by of the electrode assembly 20 to the housing 10. At the same time, the displacement distance between the first adhesive region 311 and the second adhesive region 321 is not too short, which is advantageous in reducing the tensile force transmitted by the first adhesive 30 to the electrode assembly 20, thereby reducing the risk of damage to the outer electrode pieces of the electrode assembly 20.

[0063] For example, D1 can be any one of the following values, or any combination of two values: 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.

[0064] In some embodiments, referring to Figures 4 and 5, when D2 is the distance between the first adhesive region 311 and the third adhesive region 323 along the second direction Y, 0.5 mm ≤ D2 ≤ 14 mm. When 0.5 mm ≤ D2 ≤ 14 mm, the displacement distance between the first adhesive region 311 and the third adhesive region 323 is not too long, which is advantageous in suppressing blow-by of the electrode assembly 20 to the housing 10. At the same time, the displacement distance between the first adhesive region 311 and the third adhesive region 323 is not too short, which is advantageous in reducing the tensile force transmitted by the first adhesive 30 to the electrode assembly 20, thereby reducing the risk of damage to the outer electrode pieces of the electrode assembly 20.

[0065] For example, D2 can be any one of the following values, or any combination of two values: 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.

[0066] In some embodiments, referring to Figure 6, when D3 is the distance between the center of the first adhesive 30 and the center of the electrode assembly 20 along the second direction Y, D3 ≤ 0.1L, which is advantageous for suppressing blow-by of the electrode assembly 20 and reducing the risk of damage to the outer electrode pieces of the electrode assembly 20.

[0067] For example, D3 can be any one of the following values, or any combination of two values: 0, 0.01L, 0.02L, 0.03L, 0.04L, 0.05L, 0.06L, 0.07L, 0.08L, 0.09L, or 0.1L.

[0068] In some embodiments, referring to Figure 6, when the length of the electrode assembly 20 along the second direction Y is L and the width of the electrode assembly 20 along the third direction Z is W, and the length of the first adhesive 30 along the second direction Y is L1, then 0.4L ≤ L1 ≤ 0.9L. Such a setting is advantageous in suppressing blow-by of the electrode assembly 20 and reducing the risk of damage to the outer electrode pieces of the electrode assembly 20.

[0069] For example, L1 can be any one of the following values, or any combination of two values: 0.4L, 0.45L, 0.5L, 0.55L, 0.6L, 0.65L, 0.7L, 0.75L, 0.8L, 0.85L, or 0.9L.

[0070] In some embodiments, referring to Figure 6, when the length of the electrode assembly 20 along the second direction Y is L, the width of the electrode assembly 20 along the third direction Z is W, and the width of the first adhesive 30 along the third direction Z is W1, then 0.4W ≤ W1 ≤ 0.9W. Such a setting is advantageous in suppressing blow-by of the electrode assembly 20 and reducing the risk of damage to the outer electrode pieces of the electrode assembly 20.

[0071] For example, W1 can be any one of the following values, or any combination of two values: 0.4W, 0.45W, 0.5W, 0.55W, 0.6W, 0.65W, 0.7W, 0.75W, 0.8W, 0.85W, or 0.9W.

[0072] In some embodiments, referring to Figure 4, the projections of the first adhesive 30 and the second adhesive 40 overlap along the first direction X, which is advantageous in suppressing blow-by of the electrode assembly 20 when the electrochemical apparatus 100 is subjected to impact.

[0073] In some embodiments, referring to Figure 4, along the first direction X, the projection of the second adhesive 40 covers the projection of the first adhesive 30, which is advantageous in increasing the area of ​​the overlapping region between the projections of the first adhesive 30 and the second adhesive 40, and further advantageous in suppressing blow-by of the electrode assembly 20 when the electrochemical apparatus 100 is subjected to impact.

[0074] In some embodiments, when the projected area of ​​the first adhesive 30 along the first direction X is A, and the overlapping area between the projection of the first adhesive 30 and the projection of the second adhesive 40 is S, then 0.4 ≤ S / A ≤ 1. With this setting, there exists an area that at least partially overlaps between the projected area of ​​the first adhesive 30 along the first direction X and the projected area of ​​the second adhesive 40 along the first direction X, which is advantageous in further enhancing the effect of suppressing blow-by of the electrode assembly 20 when the electrochemical apparatus 100 is subjected to impact.

[0075] For example, S / A can be any one of the following values, or any two of them: 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.

[0076] In some embodiments, referring to Figure 5, the first adhesive 30 includes a base layer 301, a first adhesive layer 302, a second adhesive layer 303, and a third adhesive layer 304, wherein the first adhesive layer 302 is connected to the surface of the base layer 301 facing the electrode assembly 20. The second adhesive layer 303 and the third adhesive layer 304 are connected to the surface of the base layer 301 facing the electrode assembly 20. The first adhesive layer 302 includes a first adhesive region 311, the second adhesive layer 303 includes a second adhesive region 321, and the third adhesive layer 304 includes a third adhesive region 323. Such a configuration allows bonding between the housing 10 and the electrode assembly 20 without the need to combine multiple tapes, which is advantageous in reducing the overall thickness of the electrochemical apparatus 100 and increasing the energy density of the electrochemical apparatus 100.

[0077] To make it easier to understand, the first adhesive layer 302, the second adhesive layer 303, and the third adhesive layer 304 can be formed by applying the adhesive substance to a predetermined area of ​​the base layer 301, or by applying the adhesive substance to the entire surface of both sides of the base layer 301 and then removing the adhesive substance locally.

[0078] In some embodiments, the material of the base layer 301 may include one of PET (polyethylene terephthalate), PVC (polyvinyl chloride), or PI (polyimide).

[0079] In some embodiments, referring to Figure 5, a portion of the surface of the base layer 301 facing the electrode assembly 20 is exposed, forming a first non-adhesive region 322, and a portion of the surface of the base layer 301 facing the housing 10 is exposed, forming a second non-adhesive region 312 and a third non-adhesive region 313. This configuration makes it possible to prevent a portion of the first adhesive 30 from adhering to the first surface 111 of the housing 10 and a portion of the first adhesive 30 from adhering to the first side surface 21 of the electrode assembly 20 without the need to combine multiple tapes, which is advantageous in reducing the overall thickness of the electrochemical apparatus 100 and increasing the energy density of the electrochemical apparatus 100.

[0080] To make it easier to understand, a shielding material is first applied to a predetermined surface of the base layer 301, adhesive material is applied to the base layer 301 again, and after the shielding material is removed, the surface that was previously covered with the shielding material is exposed without adhesive material applied, forming the first non-adhesive region 322, the second non-adhesive region 312, and the third non-adhesive region 313. Alternatively, adhesive material can be applied to the entire surface of both sides of the base layer 301, and then the adhesive material is removed from localized surfaces, exposing the surface of the base layer 301 from which the adhesive material has been removed, thereby forming the first non-adhesive region 322, the second non-adhesive region 312, and the third non-adhesive region 313.

[0081] In some embodiments, referring to Figure 7, 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 the first adhesive layer 302, and 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 spaced apart along the second direction Y. This is advantageous in reducing the risk of damage to the outer electrode pieces of the electrode assembly 20.

[0082] In some other embodiments, the first base material portion 3011 and the second base material portion 3012 are arranged along the third direction Z. This is advantageous in reducing the risk of damage to the outer electrode pieces of the electrode assembly 20.

[0083] To make it easier to understand, 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 jointly form the first non-adhesive region 322.

[0084] In some embodiments, referring to Figure 8, the first adhesive 30 includes a first single-sided tape 33, a second single-sided tape 34, and a third single-sided tape 35, wherein the first single-sided tape 33 includes a first adhesive surface 331 and a first non-adhesive surface 332 facing each other, 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 tape 34 includes a second adhesive surface 341 and a second non-adhesive surface 342 facing each other, and the second adhesive surface 341 includes a sixth adhesive region 3411 and a second adhesive region 321, with the sixth adhesive region 3411 adhering to the fourth adhesive region 3311. The third single-sided tape 35 includes a third adhesive surface 351 and a third non-adhesive surface 352 that face each other, the third adhesive surface 351 includes a seventh adhesive region 3511 and a third adhesive region 323, and the seventh adhesive region 3511 adheres to the fifth adhesive region 3312.

[0085] The first adhesive 30 can form a first adhesive region 311, a second adhesive region 321, a third adhesive region 323, a first non-adhesive region 322, a second non-adhesive region 312, and a third non-adhesive region 313 by bonding the first single-sided tape 33, the second single-sided tape 34, and the third single-sided tape 35 to each other, and has the advantages of being easy to operate, efficient, and low cost. In addition, the portion of the second single-sided tape 34 where the sixth adhesive region 3411 is provided and the portion of the third single-sided tape 35 where the seventh adhesive region 3511 is provided can further relieve the tensile force on the housing 10 by deformation, thereby further reducing the risk of the outer electrode pieces of the electrode assembly 20 being torn.

[0086] In some embodiments, referring to Figure 9, the second bonding region 321 bonds to both the first side surface 21 and the third side surface 23. In such a configuration, the first adhesive 30 can transmit the tensile force of the housing 10 to the third side surface 23 of the electrode assembly 20. If the electrode assembly 20 has a wound structure, the pole pieces located on the arc-shaped third side surface 23 are more likely to disperse the force transmitted by the adhesive, thereby reducing the risk of damage to the outer pole pieces of the electrode assembly 20. If the electrode assembly 20 has a laminated structure, the adhesive bonds to the separator, positive pole piece, or negative pole piece edge of the third side surface 23, making it less likely to damage the pole pieces of the electrode assembly 20 and contributing to suppressing the separator from sliding relative to the positive or negative pole piece.

[0087] In some embodiments, the third bonding region 323 bonds to both the first side surface 21 and the fourth side surface 24. In such a configuration, the first adhesive 30 can transmit the tensile force of the housing 10 to the fourth side surface 24 of the electrode assembly 20. If the electrode assembly 20 has a wound structure, the pole pieces located on the arc-shaped fourth side surface 24 are more likely to have the force transmitted by the adhesive distributed evenly, which is advantageous in reducing the risk of damage to the outer pole pieces of the electrode assembly 20. If the electrode assembly 20 has a laminated structure, the adhesive bonds to the separator, positive pole piece, or negative pole piece edge of the fourth side surface 24, making it less likely to damage the pole pieces of the electrode assembly 20 and contributing to suppressing the separator from sliding relative to the positive or negative pole piece.

[0088] In some embodiments, referring to Figure 10, the number of first adhesives 30 is multiple, and the multiple first adhesives 30 are arranged sequentially along the second direction Y, and the multiple first adhesives 30 are integrally molded and connected. By integrally molding the multiple first adhesives 30, it is possible to increase the areas that are not adhered to the first surface 111 or the first side surface 21 of the adhesive, so that when the electrochemical apparatus 100 is subjected to an impact, the force from the housing 10 is dissipated and absorbed by the local deformation of the multiple first adhesives 30 as it is transmitted to the electrode assembly 20, thereby reducing the risk of damage to the outer electrode pieces of the electrode assembly 20.

[0089] As an example, if the first adhesive 30 includes a base layer 301, a first adhesive layer 302, a second adhesive layer 303, and a third adhesive layer 304, the base layers 301 of the two first adhesives 30 are integrally molded, and the first adhesive layer 302 of one first adhesive 30 and the third adhesive layer 304 of the other first adhesive 30 are integrally molded.

[0090] In some other embodiments, the number of first adhesives 30 is multiple, each first adhesive 30 is an independent part, and the multiple first adhesives 30 are spaced apart along the second direction Y.

[0091] It should be understood that when there are multiple first adhesive materials 30, the sum of the distances D1 between multiple first adhesive regions 311 and second adhesive regions 321 is in the range of 0.5 mm to 10 mm, the sum of the distances D2 between multiple first adhesive regions 311 and third adhesive regions 323 is in the range of 0.5 mm to 10 mm, and the ratio of the overlapping area between the projection of multiple first adhesive materials 30 along the first direction X and the projection of second adhesive material 40 along the first direction X to the projected area of ​​multiple first adhesive materials 30 along the first direction X is in the range of 0.4 to 1.

[0092] To verify the effects of each bonded and non-bonded region of the first adhesive 30 on the electrochemical apparatus 100, the following tests were conducted.

[0093] A lithium-ion softpack battery with a rectangular maximum projection surface was selected. Of this, the length L of the wound electrode assembly 20 inside the lithium-ion softpack battery is 87 mm, the width W is 64 mm, and the thickness is 4.8 mm.

[0094] In the comparative example, one sheet of double-sided tape measuring 60.9 mm in length and 38 mm in width is used as the first adhesive 30 to bond the first surface 111 and the first side surface 21. One sheet of double-sided tape measuring 60.9 mm in length and 38 mm in width is used as the second adhesive 40 to bond the second surface 112.

[0095] In Examples 1 to 15, the first tab 50 and the second tab 60 are connected to the electrode assembly 20 and extend from the housing 10 along the second direction Y. The second adhesive region 321, the first non-adhesive region 322, and the third adhesive region 323 are provided sequentially along the second direction Y, and the second non-adhesive region 312, the first adhesive region 311, and the third non-adhesive region 313 are provided sequentially along the second direction Y. The number of first adhesives 30 and second adhesives 40 is one each, and the first adhesive 30 includes the first adhesive layer 302, the second adhesive layer 303, the third adhesive layer 304, and the first adhesive region 311, the second adhesive region 321, and the third adhesive region 323, with the first adhesive region 311 overlapping the center of the first side surface 21. The length of the first adhesive 30 is 60.9 mm and the width is 38 mm. A double-sided tape with a length of 60.9 mm and a width of 38 mm is used as the second adhesive material 40. The differences between Examples 1 to 15 are shown in the values ​​in Table 1 below.

[0096] The parameters of the first adhesive 30 in each of the above embodiments are shown in Table 1 below.

[0097] Twenty batteries are collected from each group, and a drop test is conducted to compare their pass rates. The batteries are tested in a sequence of drops from each of the six sides and four corners, with a drop height of 1.5m. After the drop test, the casing 10 is observed to see if it has ruptured or leaked. The number of batteries with ruptured or leaked casings is tallied. If the casing 10 has not ruptured or leaked, the lithium-ion soft pack battery is further disassembled and the outer electrode pieces of the electrode assembly 20 are observed to see if they have torn or damaged. The number of batteries with torn or damaged outer electrode pieces is tallied. Of these, batteries that have not ruptured or leaked casings and have not torn or damaged outer electrode pieces are judged to have passed the test. Otherwise, they are judged to have failed the test. Pass rate = number of passing batteries / 20 × 100%.

[0098] [Table 1]

[0099] Referring to Table 1, compared to the comparative example, in Examples 1 to 16, the first adhesive region 311 of the first adhesive 30 is bonded to the first surface 111, and the second adhesive 40 is bonded to the second surface 112. Both the first adhesive 30 and the second adhesive 40 are located on the side of the electrode assembly 20 along the first direction X, and 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 to 15 are advantageous in suppressing blow-by to the external structure of the entire electrochemical apparatus 100. They are advantageous in reducing the impact force transmitted by the adhesive to the electrode assembly 20 when the electrochemical apparatus 100 is subjected to impact, thereby reducing the risk of damage to the outer electrode pieces of the electrode assembly 20.

[0100] Referring to Table 1, Examples 2-10 satisfy 0.5mm ≤ D1 ≤ 14mm and 0.5mm ≤ D2 ≤ 14mm compared to Examples 1 and 11. This prevents the offset distance between the first adhesive region 311 and the second adhesive region 321 from becoming too long, and the offset distance between the first adhesive region 311 and the third adhesive region 323 from becoming too long, which is advantageous in suppressing blow-by of the electrode assembly 20 to the housing 10. Furthermore, this prevents the offset distance between the first adhesive region 311 and the second adhesive region 321 from becoming too short, and the offset distance between the first adhesive region 311 and the third adhesive region 323 from becoming too short, which is advantageous in reducing the tensile force transmitted by the first adhesive 30 to the electrode assembly 20, and reduces the risk of damage to the outer electrode pieces of the electrode assembly 20.

[0101] Referring to Table 1, compared to Example 12, Examples 13 to 16 satisfy 0.4 ≤ S / A ≤ 1, which means that there is at least a partially overlapping region between the projection region of the first adhesive 30 along the first direction X and the projection region of the second adhesive 40 along the first direction X, which is advantageous in further enhancing the effect of suppressing blow-by of the electrode assembly 20 when the electrochemical apparatus 100 is subjected to impact.

[0102] Each group will be given 20 batteries to conduct a comparative drop test to determine their pass rate. The batteries will be tested in a specific order, dropping them from each of the six sides and four corners, from a height of 1.5m. The voltage of each battery will be measured before the drop test.

[0103] Voltage Drop Test: After the drop test, voltage monitoring is performed for another 96 hours, with measurements taken once every 24 hours for a total of four measurements. If any one of the voltage drops exceeds 10mV, it is determined to be a fault due to an internal short circuit, and the test is deemed to have failed. If any one of the voltage drops does not exceed 10mV, the test is passed. Pass rate = Number of successful tests / 20 × 100%.

[0104] The difference between Examples 17 to 20 and Examples 1 to 16 is that the second adhesive region 321, the first non-adhesive region 322, and the third adhesive region 323 are provided sequentially along the third direction Z, while the second non-adhesive region 312, the first adhesive region 311, and the third non-adhesive region 313 are provided sequentially along the third direction Z.

[0105] [Table 2]

[0106] Referring to Table 2, compared to Examples 17-20, the second adhesive region 321, the first non-adhesive region 322, and the third adhesive region 323 in Examples 13-16 are provided sequentially along the second direction Y, while the second non-adhesive region 312, the first adhesive region 311, and the third non-adhesive region 313 are provided sequentially along the second direction Y. This is advantageous in suppressing blow-by of the electrode assembly 20 against the housing 10 along the second direction Y when the electrochemical apparatus 100 is subjected to impact, and is advantageous in reducing impact on the corners of the housing 10 and near the head portion 101 and tail portion 102 of the electrode assembly 20, thereby advantageous in reducing the risk of damage to the housing 10 and short-circuiting of the electrochemical apparatus 100.

[0107] Referring to Figure 11, embodiments of the present application further provide an electrical apparatus 1000, which includes the electrochemical apparatus 100.

[0108] In some embodiments, referring to Figure 11, the electrical equipment 1000 further includes an equipment body 200, and the electrochemical apparatus 100 is attached to the equipment body 200 and used to supply power to the equipment body 200.

[0109] In some embodiments, the electrical device 1000 may be a Bluetooth® earphone, a Bluetooth® speaker, a mobile phone, a laptop computer, a tablet computer, an e-reader, an electric toy, a game console, a video recorder, a portable tape recorder, a radio, a smartwatch, a lamp, or a calculator, and these will not be listed here one by one.

[0110] Since this electrical device 1000 employs the technical solutions in any embodiment of the electrochemical apparatus 100 described above, it includes at least the beneficial effects brought about by the technical solutions in any embodiment of the electrochemical apparatus 100, which will not be described in detail here.

[0111] Furthermore, those skilled in the art should recognize that the embodiments described above are merely illustrative and not limiting to this application, and any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application are all within the scope of protection of this application. [Explanation of symbols]

[0112] 100 Electrochemical apparatus 10 cabinets 11. First side wall 111 Page 1 112 Side 2 12. Second side wall 13 Third side wall 14. Fourth side wall 15. Fifth side wall 16. Sixth side wall 20 Electrode assembly 21 First aspect 22 Second aspect 23 Third aspect 24 Fourth aspect 30 First adhesive 31 First side 311 1st adhesive area 312 2nd non-adhesive area 313 Third non-adhesive area 301 Base material layer 3011 1st base material part 3012 2nd base material part 302 1st adhesive layer 303 Second adhesive layer 304 Third adhesive layer 32 Second side 321 2nd adhesive area 322 1st non-adhesive area 323 Third adhesive area 33. First single-sided tape 331 1st adhesive surface 3311 4th adhesive area 3312 5th adhesive area 332 1st non-adhesive surface 34. Second single-sided tape 341 2nd adhesive surface 3411 6th adhesive area 342 2nd non-adhesive surface 35. Third single-sided tape 351 3rd adhesive surface 3511 7th adhesive area 352 3rd non-adhesive surface 40 Second adhesive 50 Tab 1 60 Second Tab 101 Head section 102 Tail section 200 Main unit 1000 Electrical equipment X 1st direction Y Second direction Z 3rd direction

Claims

1. An electrochemical apparatus, It comprises a housing, an electrode assembly, a first adhesive, and a second adhesive. The housing includes a first side wall, the first side wall includes a first surface and a second surface facing each other in a first direction, the first surface is located inside the housing, and the second surface is located outside the housing. The electrode assembly is provided within the housing, and the electrode assembly includes a first side adjacent to the first surface. The first adhesive is located between the housing and the electrode assembly and includes a first side portion and a second side portion that face each other, the first side portion includes a first adhesive region that is adhered to the first surface, the second side portion includes a second adhesive region, a first non-adhesive region and a third adhesive region arranged sequentially along a second direction, the second adhesive region and the third adhesive region are adhered to the first side surface, the second direction is perpendicular to the first direction, and along the first direction, the projection of the first non-adhesive region overlaps with the projection of the first adhesive region. An electrochemical apparatus characterized in that the second adhesive is bonded to the second surface, and the second adhesive is configured to be bonded to an external structure.

2. The electrochemical apparatus according to claim 1, The first side further includes a second non-adhesive region and a third non-adhesive region, and along the second direction, the first adhesive region is located between the second non-adhesive region and the third non-adhesive region. An electrochemical apparatus characterized in that, along the first direction, the projection of the second non-adherent region overlaps with the second adhesive region, and the projection of the third non-adherent region overlaps with the third adhesive region.

3. The electrochemical apparatus according to claim 2, 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. An electrochemical apparatus characterized in that, along the second direction, the distance between the first adhesive region and the second adhesive region is greater than 0, and the distance between the first adhesive region and the third adhesive region is greater than 0.

4. The electrochemical apparatus according to claim 3, An electrochemical apparatus further comprising a first tab and a second tab having different polarities, wherein the first tab and the second tab are connected to the electrode assembly and extend from the housing along the second direction.

5. The electrochemical apparatus according to claim 4, Satisfying at least one of the following conditions: (1) Let L be the length of the electrode assembly along the second direction, and W be the width of the electrode assembly along the third direction, and the first, second, and third directions are perpendicular to each other, W < L, and 30 mm ≤ L ≤ 150 mm and 25 mm ≤ W ≤ 100 mm. (2) The distance between the first adhesive region and the second adhesive region along the second direction is D １ In this case, 0.5 mm ≤ D １ The size must be ≤ 14 mm. (3) The distance between the first adhesive region and the third adhesive region along the second direction is D ２ In this case, 0.5 mm ≤ D ２ An electrochemical apparatus characterized by having a size of ≤14 mm.

6. An electrochemical apparatus according to any one of claims 1 to 5, An electrochemical apparatus characterized in that, along the first direction, the projection of the first adhesive and the projection of the second adhesive overlap.

7. The electrochemical apparatus according to claim 6, An electrochemical apparatus characterized in that, along the first direction, the projection of the second adhesive covers the projection of the first adhesive.

8. An electrochemical apparatus according to claim 6 or 7, Let L be the length of the electrode assembly along the second direction, and W be the width of the electrode assembly along the third direction. The first, second, and third directions are perpendicular to each other. Let A be the projected area of ​​the first adhesive along the first direction, and S be the overlapping area between the projection of the first adhesive and the projection of the second adhesive. The electrochemical apparatus satisfies at least one of the following conditions: (1) 0.4 ≤ S / A ≤ 1, (2) The length of the first adhesive along the second direction is L １ In that case, 0.4L ≤ L １ ≤ 0.9L, (3) The width of the first adhesive along the third direction is W １ In that case, 0.4W ≤ W １ An electrochemical apparatus characterized by having a wattage of ≤0.9 W.

9. An electrochemical apparatus according to any one of claims 1 to 8, It includes at least one of the following conditions: (1) The first adhesive comprises a base layer, a first adhesive layer, a second adhesive layer and a third adhesive layer, wherein the first adhesive layer is connected to the surface of the base layer facing the housing, the second adhesive layer and the third adhesive layer are connected to the surface of the base 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 electrochemical apparatus characterized in that the first adhesive includes a first single-sided tape, a second single-sided tape and a third single-sided tape, the first single-sided tape includes a first adhesive surface and a first non-adhesive surface facing each other, the first adhesive surface includes a fourth adhesive region, a fifth adhesive region and the first adhesive region, the second single-sided tape includes a second adhesive surface and a second non-adhesive surface facing each other, the second adhesive surface includes a sixth adhesive region and the second adhesive region, the sixth adhesive region is adhered to the fourth adhesive region, the third single-sided tape includes a third adhesive surface and a third non-adhesive surface facing each other, the third adhesive surface includes a seventh adhesive region and the third adhesive region, the seventh adhesive region is adhered to the fifth adhesive region.

10. The electrochemical apparatus according to claim 1, The electrode assembly further includes a second side surface, a third side surface and a fourth side surface, wherein the second side surface and the first side surface are arranged opposite to each other along the first direction, and the third side surface and the fourth side surface are arranged opposite to each other along the second direction, satisfying at least one of the following conditions: (1) The second adhesive region is bonded to both the first and third sides, (2) An electrochemical apparatus characterized in that the third adhesive region is adhered to both the first side surface and the fourth side surface.

11. Electrical equipment, An electrical apparatus characterized by including an electrochemical apparatus as described in any one of claims 1 to 10.

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