CN220926645U - Adhesive tape and adhesive tape roll for connecting electrode pole piece - Google Patents

Abstract

The application provides an adhesive tape and an adhesive tape roll for connecting electrode plates, wherein the adhesive tape is provided with an opening, and the opening penetrates through the adhesive tape along the thickness direction of the adhesive tape. The adhesive tape is provided with the open holes, the open holes penetrate through the adhesive tape along the thickness direction of the adhesive tape, when the adhesive tape is adhered with the battery and is developed by the nondestructive testing device, as the open holes are formed in the adhesive tape, the detection signals emitted by the nondestructive testing device can form developed images with alternate brightness after passing through the non-open hole area and the open hole area of the adhesive tape, and the battery can be accurately detected to be a defective product through the alternate brightness areas, so that the purpose of improving the detection effect on the defective product of the battery is achieved.

Description

Adhesive tape and adhesive tape roll for connecting electrode pole piece

Technical Field

The application relates to the technical field of batteries, in particular to an adhesive tape and an adhesive tape roll for connecting electrode pole pieces.

Background

The battery may have defective products during the manufacturing process, which are required to be detected in a subsequent detection process so as not to be mixed into a qualified product. In the production and manufacturing process of the battery, the electrode plate may be broken in the winding process, and in order to maintain the normal production operation and production efficiency of the battery, the broken electrode plate is usually adhered together by an adhesive tape to continue winding. The battery adhered with the adhesive tape can be detected in the subsequent nondestructive detection process and recycled as a battery defective product.

However, in the related art, the adhesive tape exhibits a bright picture after being developed by the nondestructive inspection device, and thus the recognition effect of the adhesive tape is poor, resulting in poor inspection effect of defective batteries to which the adhesive tape is adhered.

Disclosure of utility model

The application provides an adhesive tape and an adhesive tape roll for connecting electrode plates, which can improve the detection effect on defective products of batteries.

In a first aspect, an embodiment of the present application provides an adhesive tape for connecting electrode tabs, where the adhesive tape is provided with an opening, and the opening penetrates through the adhesive tape along a thickness direction of the adhesive tape.

In the above embodiment, the adhesive tape is provided with the opening, and the opening penetrates the adhesive tape in the thickness direction of the adhesive tape. When the battery is adhered with the adhesive tape of the embodiment of the application and is developed by the nondestructive testing device, as the adhesive tape is provided with the holes, the detection signals emitted by the nondestructive testing device can form developed images with alternate brightness after passing through the non-hole area and the hole area of the adhesive tape, and the battery can be accurately detected to be a defective product by the areas with alternate brightness, thereby achieving the purpose of improving the detection effect on the defective product of the battery.

In some embodiments of the application, the thickness D of the tape is in the range of 0.10mm to 0.18 mm. The thickness D of the adhesive tape is set in the range, so that the detection effect on the battery can be improved, and meanwhile, the electrode pole piece adhered with the adhesive tape can be easily installed in the shell to form a battery cell, so that the detection efficiency is improved.

In some embodiments of the application, the tape includes a substrate layer and an adhesive layer. The adhesive layer is disposed on at least one surface of the base material layer. The adhesive tape comprises a substrate layer and an adhesive layer, so that the adhesive tape not only has good mechanical properties, but also has good adhesive properties.

In some embodiments of the application, the thickness d ₁ of the substrate layer and the thickness d ₂ of the adhesive layer satisfy the following relationship: d ₁/d₂ is more than or equal to 0.6 and less than or equal to 1.5. The thickness d ₁ of the base material layer and the thickness d ₂ of the adhesive layer satisfy the above relationship, so that the adhesive tape not only has good mechanical properties, but also can be helpful for improving the adhesive property of the adhesive tape.

In some embodiments of the application, the thickness d ₁ of the substrate layer is in the range of 0.04mm to 0.108 mm. The thickness d ₁ of the base material layer is set in the above range, so that the absorption of the detection signal by the non-perforated area and the perforated area of the adhesive tape can be greatly different, and the adhesive tape can be developed to form a developed image with alternate brightness and darkness.

In some embodiments of the application, the adhesive layer is disposed on one surface of the substrate layer with a thickness d ₂ in the range of 0.05mm to 0.10 mm. The thickness d ₂ of the bonding layer is set in the range, so that the adhesive tape can be further bonded on the electrode pole piece stably, the occurrence of electrode pole piece breakage is reduced, and the production efficiency of the battery is improved.

In some embodiments of the application, the width k of the tape is in the range of 4cm-6 cm. The width k of the adhesive tape is set within the above range, which can help the adhesive tape cover the crack of the electrode sheet to reduce the extension of the crack.

In some embodiments of the present application, the adhesive tape is provided with a plurality of the openings, and the plurality of the openings are spaced apart. The arrangement of a plurality of open holes can further help improving the development effect of the adhesive tape and the detection effect of the defective battery.

In some embodiments of the application, a plurality of the openings are equally spaced. The plurality of holes are distributed at equal intervals, and can form continuous developing images with light and shade intervals, so that the accuracy of adhesive tape identification and the detection effect of battery defective products can be improved.

In some embodiments of the application, the total area S ₁ of the apertures and the surface area S of any one surface of the tape satisfy the following relationship: s ₁ is less than or equal to 0.5S. The total area S ₁ of the openings and the surface area S of any surface of the adhesive tape meet the above relation, so that the adhesive tape has a good adhesive effect.

In some embodiments of the application, the spacing between adjacent two of the openings is in the range of 1.2cm to 1.8 cm. The interval between two adjacent open holes is set in the range, so that the damage of the open hole structure in the winding process can be reduced, and the development effect of the adhesive tape can be improved.

In some embodiments of the application, the aperture is circular, regular polygon, triangle, trapezoid or oval in shape. The shape of the open pore is selected from the above shapes, and the stress of the edge of the open pore can be uniform in the winding process of the electrode sheet, so that the occurrence of damage to the open pore structure in the winding process is reduced.

In some embodiments of the application, the aperture is circular in shape. The circular openings can make the stress on the edges more uniform.

In some embodiments of the application, the aperture has a pore size r in the range of 0.3cm to 0.5 cm. The aperture of the open pore is arranged in the range, so that the adhesive tape has a good bonding effect, and meanwhile, the development effect of the adhesive tape is improved, and the recognition effect of the adhesive tape is improved.

In a second aspect, embodiments of the present application provide a roll of tape comprising a core and tape as described in any of the embodiments above. The adhesive tape is wound around the winding core.

In the above embodiment, the adhesive tape roll includes the adhesive tape in the above embodiment, so the adhesive tape roll also has the technical effects of the adhesive tape in the above embodiment, and will not be described herein.

The foregoing description is only an overview of the present application, and is intended to be implemented in accordance with the teachings of the present application in order that the same may be more clearly understood and to make the same and other objects, features and advantages of the present application more readily apparent.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. Also, like reference numerals are used to designate like parts throughout the accompanying drawings. In the drawings:

FIG. 1 illustrates a schematic structural view of some example provided vehicles;

FIG. 2 illustrates an exploded view of some example provided batteries;

FIG. 3 illustrates a top view of an adhesive tape provided by some embodiments of the application;

FIG. 4 illustrates a developed image of a tape after development provided in some embodiments of the application;

FIG. 5 is a schematic cross-sectional view of an adhesive tape according to some embodiments of the present application;

Fig. 6 shows a top view of an adhesive tape provided by other embodiments of the present application.

Vehicle 1000, battery 100, controller 200, motor 300;

a case 10, a first portion 11, a second portion 12;

A battery cell 20;

tape 30, aperture 31, substrate layer 32, adhesive layer 33.

Detailed Description

Embodiments of the technical scheme of the present application will be described in detail below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present application, and thus are merely examples, and are not intended to limit the scope of the present application.

Unless defined otherwise, 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; the terms "comprising" and "having" and any variations thereof in the description of the application and the claims and the description of the drawings above are intended to cover a non-exclusive inclusion.

In the description of embodiments of the present application, the technical terms "first," "second," and the like are used merely to distinguish between different objects and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, a particular order or a primary or secondary relationship. In the description of the embodiments of the present application, the meaning of "plurality" is two or more unless explicitly defined otherwise.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.

In the description of the embodiments of the present application, the term "and/or" is merely an association relationship describing an association object, and indicates that three relationships may exist, for example, a and/or B may indicate: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.

In the description of the embodiments of the present application, the term "plurality" means two or more (including two), and similarly, "plural sets" means two or more (including two), and "plural sheets" means two or more (including two).

In the description of the embodiments of the present application, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the embodiments of the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the embodiments of the present application.

In the description of the embodiments of the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured" and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally formed; or may be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the embodiments of the present application will be understood by those of ordinary skill in the art according to specific circumstances.

The battery has high energy density, good cycle performance, and good rechargeable performance, and is widely applied to consumer electronics equipment, electric vehicles, aerospace equipment and other equipment. In order to enable the battery to be better applied to the above-mentioned devices, it is generally necessary to detect the produced battery in order to reduce the presence of battery defective products. In the production and manufacturing process of the battery, the electrode plate may be broken in the winding process, and in order to maintain the normal production operation and production efficiency of the battery, the broken electrode plate is usually adhered together by an adhesive tape to continue winding. The battery adhered with the adhesive tape can be detected in the subsequent nondestructive detection process and recycled as a battery defective product.

However, in the related art, the nondestructive inspection device is not good in recognition effect of the adhesive tape, thereby causing poor inspection effect of defective batteries to which the adhesive tape is adhered.

In view of this, the embodiment of the application provides an adhesive tape and an adhesive tape roll, which can improve the detection effect on defective batteries.

In the application, the battery can be used as a power supply system of the power utilization device to supply electric energy to the power utilization device. And the electric device can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, a battery car, an electric vehicle, a ship, a spacecraft and the like. Among them, the electric toy may include fixed or mobile electric toys, such as game machines, electric car toys, electric ship toys, electric plane toys, and the like, and the spacecraft may include planes, rockets, space planes, and spacecraft, and the like.

Referring to fig. 1, fig. 1 illustrates a schematic structural diagram of a vehicle 1000 provided by some examples.

The vehicle 1000 may be a fuel oil vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or a range-extended vehicle. The battery 100 is provided in the interior of the vehicle 1000, and the battery 100 may be provided at the bottom or the head or the tail of the vehicle 1000. The battery 100 may be used for power supply of the vehicle 1000, for example, the battery 100 may be used as an operating power source of the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, the controller 200 being configured to control the battery 100 to power the motor 300, for example, for operating power requirements during start-up, navigation, and travel of the vehicle 1000.

In some examples, battery 100 may not only serve as an operating power source for vehicle 1000, but may also serve as a driving power source for vehicle 1000, providing driving power for vehicle 1000 instead of or in part instead of fuel oil or natural gas.

Referring to fig. 2, fig. 2 illustrates an exploded view of some example provided batteries 100.

The battery 100 includes a case 10 and a battery cell 20, and the battery cell 20 is accommodated in the case 10. The case 10 is used to provide an accommodating space for the battery cells 20, and the case 10 may take various structures. In some embodiments, the case 10 may include a first portion 11 and a second portion 12, the first portion 11 and the second portion 12 being overlapped with each other, the first portion 11 and the second portion 12 together defining an accommodating space for accommodating the battery cell 20. The second part 12 may be a hollow structure with one end opened, and the first part 11 may be a plate-shaped structure, and the first part 11 covers the opening side of the second part 12, so that the first part 11 and the second part 12 together define an accommodating space; the first portion 11 and the second portion 12 may be hollow structures each having an opening at one side, and the opening side of the first portion 11 is engaged with the opening side of the second portion 12. Of course, the case 10 formed by the first portion 11 and the second portion 12 may be of various shapes, such as a cylinder, a rectangular parallelepiped, or the like.

In the battery 100, the plurality of battery cells 20 may be connected in series, parallel or a series-parallel connection, wherein the series-parallel connection refers to that the plurality of battery cells 20 are connected in series or parallel. The plurality of battery cells 20 can be directly connected in series or in parallel or in series-parallel, and then the whole formed by the plurality of battery cells 20 is accommodated in the box 10; of course, the battery 100 may also be a battery module formed by connecting a plurality of battery cells 20 in series or parallel or series-parallel connection, and a plurality of battery modules are then connected in series or parallel or series-parallel connection to form a whole and are accommodated in the case 10. Wherein each battery cell 20 may be a secondary battery or a primary battery; but not limited to, lithium sulfur batteries, sodium ion batteries, or magnesium ion batteries. The battery cell 20 may be in the shape of a cylinder, a flat body, a rectangular parallelepiped, or other shapes, etc.

The battery cell 20 is the smallest unit constituting the battery, and includes an end cap, a case, an electrode assembly, and other functional parts.

The end cap refers to a member that is covered at the opening of the case to isolate the inner environment of the battery cell 20 from the outer environment. Without limitation, the shape of the end cap may be adapted to the shape of the housing to fit the housing. Alternatively, the end cap may be made of a material having a certain hardness and strength (such as an aluminum alloy), so that the end cap is not easily deformed when being extruded and collided, so that the battery cell 20 can have a higher structural strength, and the safety performance can be improved. The end cap may be provided with a functional part such as an electrode terminal or the like. The electrode terminals may be used to be electrically connected with the electrode assembly for outputting or inputting electric power of the battery cell 20.

In some examples, a pressure relief mechanism may also be provided on the end cap for relieving the internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold. The material of the end cap may be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not particularly limited in the embodiment of the present application.

In some examples, insulation may also be provided on the inside of the end cap, which may be used to isolate electrical connection components within the housing from the end cap to reduce the risk of short circuits. By way of example, the insulation may be plastic, rubber, or the like.

The case is an assembly for mating with the end cap to form an internal environment of the battery cell 20, wherein the formed internal environment may be used to house the electrode assembly, electrolyte, and other components. The housing and the end cap may be separate components and an opening may be provided in the housing to create an internal environment for the battery cell 20 by closing the end cap at the opening. The end cap and the housing may be integrated, and in particular, the end cap and the housing may be formed with a common connection surface prior to insertion of the other components into the housing, and the end cap may be closed to the housing when it is desired to encapsulate the interior of the housing. The housing may be of various shapes and sizes, such as rectangular parallelepiped, cylindrical, hexagonal prism, etc. Specifically, the shape of the case may be determined according to the specific shape and size of the electrode assembly. The material of the housing may be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not particularly limited in the embodiment of the present application.

The electrode assembly is a component in which electrochemical reactions occur in the battery cell 20. One or more electrode assemblies may be contained within the housing. The electrode assembly is mainly formed by winding or stacking a positive electrode sheet and a negative electrode sheet, and a separator is generally provided between the positive electrode sheet and the negative electrode sheet. The parts of the positive pole piece and the negative pole piece with active substances form a main body part of the electrode assembly, and the parts of the positive pole piece and the negative pole piece without active substances form electrode lugs respectively. The positive electrode tab and the negative electrode tab may be located at one end of the main body portion together or located at two ends of the main body portion respectively. During charge and discharge of the battery, the positive electrode active material and the negative electrode active material react with the electrolyte, and the tab is connected with the electrode terminal to form a current loop.

Fig. 3 illustrates a top view of an adhesive tape provided by some embodiments of the application. Fig. 4 illustrates a developed image of a tape after development provided in some embodiments of the application.

Referring to fig. 3, an embodiment of the present application provides an adhesive tape for connecting electrode pads, wherein an opening 31 is formed in an adhesive tape 30, and the opening 31 penetrates the adhesive tape 30 along a thickness direction of the adhesive tape 30.

In the embodiment of the present application, the electrode tab may be a positive electrode tab or a negative electrode tab of a battery cell, which is not particularly limited in the embodiment of the present application.

The adhesive tape 30 is not particularly limited, and may be any adhesive tape 30 for connecting electrode tabs, such as yellow adhesive.

The open holes 31 penetrate the adhesive tape 30 along the thickness direction of the adhesive tape 30, and the open holes 31 can enable the adhesive tape 30 to have images with alternate brightness when detected by a nondestructive detection device, as shown in fig. 4, the area of the open holes 31 is a dark area, and the area of the non-open holes 31 is a bright area, so that the adhesive tape 30 can be conveniently identified, and the detection of defective batteries is facilitated.

In the above embodiments, the adhesive tape 30 is provided with the opening 31, and the opening 31 penetrates the adhesive tape 30 in the thickness direction of the adhesive tape 30. When the battery is adhered with the adhesive tape 30 according to the embodiment of the application and developed by the nondestructive testing device, as the adhesive tape 30 is provided with the opening 31, after the detection signal emitted by the nondestructive testing device passes through the non-opening area and the opening area on the adhesive tape 30, a developed image with alternate brightness can be formed, and the battery can be accurately detected as a defective product through the areas with alternate brightness, thereby achieving the purpose of improving the detection effect on the defective product of the battery.

In some embodiments of the application, the width k of the tape 30 is in the range of 4cm-6 cm.

Referring to fig. 3, k is indicated as the width of the tape 30.

In the above embodiments, the width k of the adhesive tape 30 is set within the above range, which can help the adhesive tape 30 cover the crack of the electrode tab to reduce the extension of the crack.

Illustratively, the width k of the tape 30 may be, but is not limited to 4.0cm、4.1cm、4.2cm、4.3cm、4.4cm、4.5cm、4.6cm、4.7cm、4.8cm、4.9cm、5.0cm、5.1cm、5.2cm、5.3cm、5.4cm、5.5cm、5.6cm、5.7cm、5.8cm、5.9cm、6.0cm.

Fig. 5 is a schematic cross-sectional view of an adhesive tape according to some embodiments of the present application.

Referring to fig. 5, in some embodiments of the present application, the thickness D of the tape 30 is in the range of 0.10mm-0.18 mm.

The tape 30 has a first surface and a second surface disposed opposite one another, and the thickness D of the tape 30 is generally referred to as the perpendicular distance between the first surface and the second surface. It will be appreciated that the depth of the aperture 31 is equal to the thickness D of the tape 30.

In these embodiments, the thickness D of the adhesive tape 30 is set within the above range, on the one hand, the absorption of the detection signal sent by the nondestructive detection device by the non-perforated 31 area of the adhesive tape 30 is higher than that of the perforated area, so that a clearer image with alternate brightness and darkness appears on the developed image, and the adhesive tape 30 can be accurately identified, thereby helping to improve the detection effect on the battery. On the other hand, the electrode assembly formed of the electrode tab bonded with the adhesive tape 30 is easily mounted into the case to form a battery cell when the battery cell is assembled, thereby improving the efficiency of detection.

With continued reference to fig. 5, in some embodiments of the present application, the tape 30 includes a substrate layer 32 and an adhesive layer 33. The adhesive layer 33 is provided on at least one surface of the base material layer 32.

The material of the substrate layer 32 may be paper, plastic film, foam, non-woven fabric, aluminum foil, etc., which is not particularly limited in the embodiment of the present application.

The adhesive layer 33 may be provided on either one surface or both surfaces of the base material layer 32, which is not particularly limited in the embodiment of the present application. With continued reference to fig. 3, in some embodiments, an adhesive layer 33 is disposed on one surface of the substrate layer 32.

The adhesive layer 33 may be formed by uniformly coating an adhesive on the surface of the base material layer 32, wherein the adhesive may be selected from natural rubber, synthetic rubber, acrylic acid ester, silicone rubber, ethylene-vinyl acetate (EVA), and the like. Specifically, the binder may be selected based on the material of the substrate layer 32 and the application requirements.

In the above embodiments, the adhesive tape 30 includes the base material layer 32 and the adhesive layer 33, which can provide the adhesive tape 30 with not only good mechanical properties, such as tensile properties, but also good adhesive properties.

In some embodiments of the present application, the thickness d ₁ of the substrate layer 32 and the thickness d ₂ of the adhesive layer 33 satisfy the following relationship: d ₁/d₂ is more than or equal to 0.6 and less than or equal to 1.5.

The substrate layer 32 has two surfaces disposed opposite each other, and the thickness d ₁ of the substrate layer 32 generally refers to the perpendicular distance between the two surfaces.

The adhesive layer 33 also has two surfaces disposed opposite each other, and the thickness d ₂ of the adhesive layer 33 generally refers to the perpendicular distance between the two surfaces.

In the above embodiments, the thickness d ₁ of the base material layer 32 and the thickness d ₂ of the adhesive layer 33 satisfy the above relationship, so that not only can the adhesive tape 30 have high mechanical strength, such as tensile property, but also the adhesive effect of the adhesive tape 30 can be improved, so that the electrode sheet is firmly connected.

Illustratively, d ₁/d₂ may be, but is not limited to, 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, 1.2, 1.3, 1.4, 1.5.

In some embodiments of the application, the thickness d ₁ of the substrate layer 32 is in the range of 0.04mm to 0.108 mm.

In these embodiments, the thickness d ₁ of the substrate layer 32 is set within the above range, so that the absorption of the detection signal by the non-open area and the open area of the adhesive tape can be greatly different, that is, the absorption of the detection signal by the non-open area is higher than that of the open area, so that the non-open area can form a bright area in the developed image, which is helpful for the adhesive tape 30 to present a developed image with alternate brightness and darkness during development, and the recognition effect of the adhesive tape 30 is improved.

In some examples, the thickness d ₁ of the substrate layer 32 may be 0.06mm, and the thickness d ₂ of the adhesive layer 33 may be set to a value of less than 0.10mm, for example, d ₂ may be set to a value of 0.04mm to 0.10 mm. In other examples, the thickness d ₁ of the substrate layer 32 may be 0.10mm, and the thickness d ₂ of the adhesive layer 33 may be set to a value of less than 0.08mm, for example, d ₂ may be set to a value of 0.01mm to 0.08mm.

In some embodiments of the present application, the thickness d ₂ of the adhesive layer 33 disposed on one surface of the substrate layer 32 is in the range of 0.05mm to 0.10 mm.

In the above embodiments, the thickness d ₂ of the adhesive layer 33 is set within the above range, so that the adhesive tape 30 can be further stably adhered to the electrode tab, and the occurrence of breakage of the electrode tab can be reduced, thereby improving the production efficiency of the battery.

In some examples, the thickness d ₂ of the adhesive layer 33 may be set to 0.05mm, and the thickness d ₁ of the base material layer 32 may be set to a value of less than 0.075mm, for example, the thickness d ₁ may be set to a value of 0.03mm to 0.075mm. In other examples, the thickness d ₂ of the adhesive layer 33 may be set to 0.10mm, the thickness d ₁ of the base material layer 32 may be set to 0.15mm or less, and the thickness d ₁ may be in the range of 0.06mm to 0.15mm, for example.

Fig. 6 illustrates a top view of an adhesive tape provided by some embodiments of the application.

In some embodiments of the present application, the adhesive tape 30 is provided with a plurality of openings 31, and the plurality of openings 31 are spaced apart.

In the embodiment of the present application, the number of the openings 31 is at least two, and the spacing a between two adjacent openings 31 may be equal or unequal. Specifically, the spacing between two adjacent openings 31 may be designed according to practical application requirements.

Note that, the distance a between two adjacent openings 31 generally refers to the distance between the centers of the two adjacent openings 31.

In the above embodiments, the provision of the plurality of openings 31 can display continuous images with alternate brightness in the developed image, further contributing to the improvement of the development effect of the adhesive tape 30 and also improving the detection effect of defective batteries.

In some embodiments of the present application, the plurality of openings 31 are equally spaced apart.

In the above embodiments, the plurality of openings 31 are equidistantly spaced to form a continuous developed image with alternate brightness and darkness, so as to help to improve the accuracy of the recognition of the adhesive tape 30 and to improve the detection effect of defective batteries.

In some embodiments of the present application, the total area S ₁ of the apertures 31 and the surface area S of any one surface of the tape 30 satisfy the following relationship: s ₁ is less than or equal to 0.5S.

The total area S ₁ of the openings 31 refers to the sum of the cross-sectional areas of the openings 31 parallel to the surface of the tape 30. The surface area S refers to the area of the adhesive tape 30 before the openings 31 are not provided, and it is understood that S is the sum of the total area S ₁ of the openings 31 and the area S ₂ of the area where no openings 31 are provided.

In the above embodiments, the total area S ₁ of the openings 31 and the surface area S of any one surface of the adhesive tape 30 satisfy the above relationship, so that the adhesive layer 33 is disposed in the area of the adhesive tape 30 where the openings 31 are not formed, which helps to improve the adhesive effect of the adhesive tape 30, so that the adhesive tape 30 can be firmly adhered to the electrode tab, which helps to improve the detection effect of defective batteries.

In some embodiments of the application, the spacing a of two adjacent openings 31 is in the range of 1.2cm to 1.8 cm.

It is understood that, among the at least three openings 31, the spacing a between two adjacent openings 31 may be equal or unequal.

In the above embodiments, the interval a between two adjacent openings 31 is set within the above range, which can reduce the occurrence of breakage of the structure of the openings 31 during winding and can also contribute to the improvement of the developing effect of the adhesive tape 30.

In the embodiment of the present application, the shape of the opening 31 may be any shape as long as an image with alternate brightness can be displayed in the developed image.

In some embodiments of the present application, the aperture 31 is circular, regular polygon, triangle, trapezoid or oval in shape.

The shape of the opening 31 is set to be the shape, so that the stress on the edge of the opening 31 is uniform in the electrode pole piece winding process, and the opening 31 with the shape is not easy to be pulled in the electrode pole piece winding process to cause the damage of the hole-shaped structure.

In some embodiments of the present application, the aperture 31 is circular in shape. The circular openings 31 can make the edge thereof more uniformly stressed, thereby reducing the occurrence of the damage to the hole-like structure.

In some embodiments of the application, the aperture diameter r of the opening 31 is in the range of 0.3cm-0.5 cm.

In the above embodiments, the openings 31 are circular, and the diameters of the openings 31 are set within the above ranges, so that the adhesive tape 30 can have a good adhesive effect, and the development effect of the adhesive tape 30 can be improved, thereby improving the recognition effect of the adhesive tape 30.

An embodiment of the present application provides a roll of tape, including a roll core and the tape of any of the embodiments above, the tape being wound around the roll core.

In the above embodiment, the adhesive tape roll includes the adhesive tape in the above embodiment, so the adhesive tape roll also has the technical effects of the adhesive tape in the above embodiment, and will not be described herein.

According to some embodiments of the application, the adhesive tape is provided with a plurality of openings, and the plurality of openings are equally spaced apart on the adhesive tape. Therefore, continuous images with alternate brightness can be displayed in the developed image, the development effect of the adhesive tape can be further improved, and the detection effect of defective batteries can be improved.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the application, and are intended to be included within the scope of the appended claims and description. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.

Claims (13)

1. An adhesive tape for connecting electrode sheets, characterized in that the adhesive tape is provided with an opening penetrating the adhesive tape in the thickness direction of the adhesive tape;

the adhesive tape is provided with a plurality of openings, and the openings are arranged at intervals;

The total area S ₁ of the openings satisfies the following relationship with the surface area S of any one surface of the adhesive tape: s ₁ is less than or equal to 0.5S.

2. The tape of claim 1, wherein the tape has a thickness D in the range of 0.10mm to 0.18 mm.

3. The tape of claim 1, wherein the tape comprises:

A substrate layer;

and an adhesive layer provided on at least one surface of the base material layer.

4. A tape according to claim 3, wherein the thickness d ₁ of the substrate layer and the thickness d ₂ of the adhesive layer satisfy the following relationship: d ₁/d₂ is more than or equal to 0.6 and less than or equal to 1.5.

5. The tape of claim 4, wherein the substrate layer has a thickness d ₁ in the range of 0.04mm to 0.108 mm.

6. The tape of claim 4, wherein the adhesive layer is disposed on one surface of the substrate layer with a thickness d ₂ in the range of 0.05mm to 0.10 mm.

7. The tape of claim 1, wherein the tape has a width k in the range of 4cm to 6 cm.

8. The tape of claim 1, wherein a plurality of the openings are equally spaced apart.

9. The tape of claim 1, wherein the spacing between adjacent two of said openings is in the range of 1.2cm to 1.8 cm.

10. The tape of claim 1, wherein the aperture has a shape of a circle, regular polygon, triangle, trapezoid, or ellipse.

11. The tape of claim 10, wherein the aperture is circular in shape.

12. The tape of claim 11, wherein the open cell has a pore size r in the range of 0.3cm to 0.5 cm.

13. A roll of tape, comprising:

a winding core;

The tape of any one of claims 1-12 wound around the winding core.