Battery cell, battery, and electric device

Abstract

A battery cell, a battery, and an electric device. The battery cell comprises a main body part, a first tab, a first insulating adhesive, and a second insulating adhesive; the first tab is formed at an axial end portion of the main body part; the first insulating adhesive is adhered to the periphery of the main body part; the second insulating adhesive is adhered to the first tab; and a gap is formed between the first insulating adhesive and the second insulating adhesive in the axial direction of the main body part. The battery comprises the battery cell. The electric device comprises the battery cell or the battery.

Description

Battery cells, batteries and electrical equipment

[0001] This application is based on the application with Chinese application number 202310970192.8 and application date August 3, 2023, and claims its priority. The disclosed content of the Chinese application is hereby introduced as a whole into this application. Technical Field

[0002] The present invention relates to the technical field of batteries, and in particular to a battery cell, a battery and an electrical device. Background Art

[0003] Energy conservation and emission reduction are key to the sustainable development of the automotive industry. Electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of the sustainable development of the automotive industry. For electric vehicles, battery technology is a key factor in their development.

[0004] Batteries are constantly charged and discharged during use, so insulation is very important. Insulation glue is usually applied to the outside of the battery cell, and the way the glue is applied can affect the overall performance of the battery.

[0005] The above statements are only used to provide background information related to the present application and do not necessarily constitute prior art.

[0006] Summary of the Invention

[0007] The present application provides a battery cell, a battery, and an electrical device.

[0008] In a first aspect, the present application provides a battery cell comprising a main body, a first tab, a first insulating glue, and a second insulating glue, wherein the first tab is formed at an axial end of the main body, the first insulating glue is adhered to the outer periphery of the main body, and the second insulating glue is adhered to the first tab, wherein a gap is provided between the first insulating glue and the second insulating glue in the axial direction of the main body.

[0009] In the embodiment provided in the present application, by setting a gap between the first insulating glue and the second insulating glue in the axial direction of the main body, the formation of steps between the first insulating glue and the second insulating glue can be reduced, thereby reducing stress concentration points when the battery cell expands, reducing the occurrence of problems such as pole piece breakage, and helping to improve the safety of the battery.

[0010] In some embodiments, the gap extends along the circumference of the main body. This arrangement provides a benefit in that the first and second insulating adhesives do not overlap at all along the circumference of the main body. Consequently, there is no overlap between the first and second insulating adhesives, resulting in no steps. This minimizes stress concentration points during battery cell expansion, preventing problems such as fracture of the battery cell pole pieces.

[0011] In some embodiments, the width of the gap in the axial direction of the main body is 1 mm to 2 mm.

[0012] Setting the gap width to 1mm to 2mm can not only reduce the stress concentration point when the battery cell expands and avoid problems such as breakage of the battery cell electrode, but also make the electrode assembly have the largest possible insulation coverage range and improve insulation performance.

[0013] In some embodiments, in the axial direction of the main body, the width of the gap is constant or varies along the circumferential direction.

[0014] Setting the gap width to be fixed along the circumference can keep the gap width uniform, improving the product's aesthetics and overall integrity. Setting the gap width to vary along the circumference can reduce the difficulty of applying the first and second insulating adhesives, improving the application efficiency.

[0015] In some embodiments, the second insulating adhesive has a greater puncture resistance than the first insulating adhesive.

[0016] The first tab is usually made of aluminum foil and is more fragile than the main body. Therefore, setting the puncture resistance of the second insulating glue to be greater than the puncture resistance of the first insulating glue can more effectively protect the first tab and prevent it from being damaged.

[0017] In some embodiments, in the circumferential direction of the first electrode tab, the head and tail of the second insulating glue have overlapping portions.

[0018] The overlapping portion allows the head and tail of the second insulating adhesive to be bonded together, forming a closed loop circumferentially, providing omnidirectional insulation protection for the first tab. This also effectively improves the bonding strength of the second insulating adhesive, making it more firmly adhered to the first tab. Furthermore, the second insulating adhesive typically has a certain degree of elasticity. By providing the overlapping portion and bonding the head and tail of the second insulating adhesive together, the second insulating adhesive can be prevented from shrinking due to reduced or absent elasticity, thereby preventing it from losing its protection of the first tab.

[0019] In some embodiments, in the circumferential direction of the first electrode tab, the length of the overlapping portion is 5 mm to 10 mm.

[0020] Setting the circumferential length of the overlapping portion to 5 mm to 10 mm can better enhance the stability of the second insulating adhesive and avoid stress concentration caused by the excessive circumferential length of the overlapping portion.

[0021] In some embodiments, the upper layer of the overlapping portion is misaligned relative to the lower layer. This embodiment allows for the tail of the second insulating adhesive to misalign during application, effectively improving operational efficiency by providing a certain degree of tolerance without compromising insulation and protection. Furthermore, this misalignment can also be caused by manufacturing errors in the second insulating adhesive, allowing for a certain degree of manufacturing error in the second insulating adhesive, thereby reducing the manufacturing precision requirements and effectively controlling costs.

[0022] In some embodiments, in the circumferential direction of the first electrode tab, a head edge line and a tail edge line of the second insulating glue are parallel.

[0023] In the above embodiment, the head edge line and the tail edge line of the second insulating adhesive are parallel, which can improve the overall aesthetics of the second insulating adhesive. Moreover, the overlapping portion formed after pasting can be a regular rectangle, which is overall more beautiful and regular.

[0024] In some embodiments, in the circumferential direction of the first electrode tab, a head edge line and / or a tail edge line of the second insulating glue is inclined relative to the axis of the main body.

[0025] By setting the head edge line and / or tail edge line of the second insulating glue to be inclined relative to the axis of the main body, the center line of the overlapping part can be inclined relative to the axis of the main body, thereby increasing the length of the center line of the overlapping part. When the second insulating glue retracts due to the decrease in elastic force, the ability of the overlapping part to resist the shrinkage force can be increased, thereby improving the adhesion firmness of the second insulating glue.

[0026] In some embodiments, the second insulating adhesive includes a first adhesive portion and a second adhesive portion, the first adhesive portion is circumferentially adhered to the outer periphery of the first tab, and the second adhesive portion is adhered to the end surface of the first tab away from the main body.

[0027] By providing the first adhesive portion and the second adhesive portion, the first adhesive portion can be circumferentially adhered to the outer periphery of the first tab, and the second adhesive portion can be adhered to the end face of the first tab away from the main body, thereby providing multi-directional protection for the first tab.

[0028] By providing the second adhesive portion, the end face of the first tab can be protected to prevent the end face of the first tab from rising beyond the height of the first adhesive portion and overlapping with the housing, thereby causing a short circuit.

[0029] In some embodiments, the battery body further includes a first current collecting disk provided on an end surface of the first tab away from the main body, and the second adhesive portion is adhered to the first current collecting disk.

[0030] By adhering the second adhesive portion to the first current collecting disk, the second adhesive portion can completely wrap the portion of the first electrode tab exposed outside the first current collecting disk, thereby achieving more comprehensive protection for the first electrode tab.

[0031] In some embodiments, the first adhesive portion and the second adhesive portion are connected or integrally formed.

[0032] By connecting or integrally forming the first adhesive portion with the second adhesive portion, the first adhesive portion and the second adhesive portion can be connected as a whole. When applying the second insulating adhesive, the first adhesive portion and the second adhesive portion can cooperate with each other to achieve a better adhesive effect. For example, the first adhesive portion can be first adhered to the outer periphery of the first tab, and then the second adhesive portion can be adhered to the end surface of the first tab using a smoothing device.

[0033] In some embodiments, the viscosity of the second adhesive portion is greater than the viscosity of the first adhesive portion.

[0034] When the second adhesive portion is bent inward 90° from a position parallel to the axis of the main body and adhered to the end face of the first electrode ear, wrinkles will occur in the second adhesive portion, and air may enter the wrinkled portion. The colloid in the second adhesive portion will be dehydrated due to air drying, thereby weakening the viscosity. The first adhesive portion is adhered to the outer periphery of the first electrode ear and is relatively flat after adhesion. The chance of air entering is small, and therefore the probability of weakening the viscosity due to dehydration is also small. Therefore, setting the viscosity of the second adhesive portion to be greater than the viscosity of the first adhesive portion can ensure that the second adhesive portion still has sufficient viscosity to remain on the end face of the first electrode ear after the viscosity is weakened due to dehydration.

[0035] In addition, because the second adhesive portion is bent and flattened on the end surface of the first electrode ear, the elastic force of the second adhesive portion will decrease over time, and there is a risk of retraction. Therefore, setting the viscosity of the second adhesive portion to be greater than the viscosity of the first adhesive portion can make the second adhesive portion have a greater ability to resist the reduction of elastic force and retraction, thereby preventing the second adhesive portion from failing.

[0036] The viscosity of the first adhesive portion is lower than that of the second adhesive portion. When the first adhesive portion is not adhered properly and fails to meet the requirements and needs to be reworked, the first adhesive portion can be easily torn off without adhering to the material of the main body, making it easy to re-adhere.

[0037] In some embodiments, a ratio of a width of the first adhesive portion in the axial direction of the main body to a width of the second adhesive portion in a direction perpendicular to the axis of the main body is 1:1 to 2:1.

[0038] By setting the ratio of the width of the first adhesive portion in the axial direction of the main body to the width of the second adhesive portion in the direction perpendicular to the axis of the main body to 1:1 to 2:1, relatively comprehensive protection of the first electrode tab can be achieved, and a reasonable distribution of the periphery and end face of the first electrode tab can be achieved while saving costs.

[0039] In some embodiments, the second insulating adhesive is provided with an indicator line, which separates the second insulating adhesive into a first adhesive portion and a second adhesive portion.

[0040] By providing the indicator line, the range of the first and second adhesive sections can be quickly identified by the indicator line when applying the second insulating adhesive. The indicator line can serve as an operating aid and effectively improve the efficiency of application.

[0041] In some embodiments, the color of the indicator line is different from the color of the second insulating glue.

[0042] By setting the color of the indicator line to be different from the color of the second insulating glue, the indicator line can be made more eye-catching, making it easier for operators to identify its location.

[0043] In some embodiments, the second adhesive portion includes a substrate and an adhesive backing disposed on the substrate, and the color of at least one of the substrate and the adhesive backing is set to a color that can prevent reflection when detecting the width of the second adhesive portion.

[0044] By setting the color of at least one of the substrate and the backing adhesive to a color that can prevent reflection when detecting the width of the second adhesive portion, it is possible to prevent reflection from occurring when detecting the width of the second adhesive portion due to the substrate and backing adhesive being too light in color, thereby affecting the accuracy of the test.

[0045] In some embodiments, the battery cell further includes a shell having a receiving cavity, the main body and the first tab are disposed in the receiving cavity, and the material used for the shell is configured to prevent the shell from contacting the negative electrode of the battery cell and causing corrosion.

[0046] The material of the shell is set to be a material that can prevent the shell from contacting the negative electrode of the battery cell and causing corrosion, so as to avoid the exposed part from bulging or warping and contacting the shell and causing corrosion.

[0047] In a second aspect, the present application provides a battery, comprising a housing and the above-mentioned battery cells, wherein the battery cells are disposed in the housing and are used to provide electrical energy.

[0048] In a third aspect, the present application provides an electrical device, comprising the above-mentioned battery cell, the battery cell being used to supply electric energy to the electrical device; or comprising the above-mentioned battery, the battery being used to supply electric energy to the electrical device.

[0049] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the drawings without creative work.

[0051] FIG1 is a schematic structural diagram of some embodiments of the electrical equipment disclosed in this application.

[0052] FIG2 is a schematic structural diagram of some embodiments of the battery disclosed in this application.

[0053] FIG3 is a schematic structural diagram of some embodiments of the battery cell disclosed in this application.

[0054] FIG4 is a cross-sectional view of the embodiment shown in FIG3 along section AA.

[0055] FIG5 is an enlarged view of the portion indicated by reference numeral B in FIG4.

[0056] FIG6 is a schematic diagram of the pasting of the first insulating adhesive and the second insulating adhesive in some embodiments of the battery cell disclosed in this application.

[0057] FIG7 is a schematic diagram of the pasting of the first insulating adhesive and the second insulating adhesive in other embodiments of the battery cell disclosed in the present application.

[0058] FIG8 is a schematic diagram of the pasting of the first insulating adhesive and the second insulating adhesive in some other embodiments of the battery cell disclosed in the present application.

[0059] FIG9 is a schematic structural diagram of the second insulating adhesive in some embodiments of the battery cell disclosed in this application.

[0060] FIG10 is a schematic structural diagram of the second insulating adhesive in other embodiments of the battery cell disclosed in this application.

[0061] In the drawings, the drawings are not drawn to scale.

[0062] Marking instructions: 1000, vehicle; 100, battery; 200, controller; 300, motor; 10, housing; 101, first cover; 102, second cover; 20, battery cell; 1, main body; 2, first pole ear; 3, first insulating glue; 4, second insulating glue; 41, first adhesive portion; 42, second adhesive portion; 43, overlapping portion; 44, indicator line; 5, gap; 6, first collecting plate; 7, second pole ear; 8, second collecting plate; 9, housing; 11, insulating part; 12, sealing ring; 13, pole; 14, sealing nail; 15, liquid filling port. DETAILED DESCRIPTION

[0063] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0064] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0065] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the technical features indicated. In addition, the term "perpendicular" does not mean perpendicular in the strict sense, but rather means within the allowable error range. The term "parallel" does not mean parallel in the strict sense, but rather means within the allowable error range.

[0066] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0067] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0068] In the description of the embodiments of the present application, the term "multiple" refers to more than two, unless otherwise specifically defined. Similarly, "multiple groups" refers to more than two groups, and "multiple sheets" refers to more than two sheets, unless otherwise specifically defined.

[0069] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0070] In the description of the embodiments of the present application, unless otherwise clearly specified or limited, technical terms such as "installed," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to internal connections between two components or interactions between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood based on the specific circumstances.

[0071] Currently, market developments indicate that power batteries are becoming increasingly widely used. They are not only used in energy storage systems such as hydropower, thermal, wind, and solar power plants, but are also widely used in electric vehicles like electric bicycles, electric motorcycles, and electric vehicles, as well as in military equipment and aerospace. As power battery applications continue to expand, market demand is also growing.

[0072] Cylindrical battery cells generally use a full-tab structure. During battery cell manufacturing, after the wound battery cell has been tab-formed, insulation between the cell and the casing is required. Common insulation methods include adhesive bonding and insulation through an insulating cover.

[0073] As for the method of adhesive insulation, the most common adhesive method is overlapping adhesive, that is, the insulating adhesive pasted on the tab and the large-surface engraved adhesive pasted on the bare cell overlap in the height direction. Although this method can protect the entire cell in the insulating adhesive, the overlapping position of the insulating adhesive pasted on the tab and the large-surface engraved adhesive pasted on the bare cell will form a step with a certain height due to the stacking of multiple layers of adhesive. In addition, since the group margin of cylindrical cells (the group margin is the ratio of the cell diameter to the shell diameter) is generally high, the cell pole pieces will expand after charging and discharging. Therefore, stress concentration points are easily formed at the step at this adhesive overlapping position. The outer ring pole pieces of the cell are prone to breakage and other failure phenomena during the cycle process, and there is a risk of cell capacity loss or even fire.

[0074] For insulation through an insulating cover, an insulating cover with an open top is usually pre-made using materials such as PET or PP. During the battery cell assembly process, the insulating cover is directly put into the end of the battery cell's tab to form an insulating layer between the tab and the shell, thereby achieving the insulation purpose.

[0075] However, the insulating cover is typically made of a thin material, making it soft and prone to deformation. Considering the need to place the insulating cover at the end of the battery cell for manufacturability and to maintain its roundness, the sidewall thickness of the insulating cover is typically thicker, typically over 0.2mm. This creates a step of considerable height between the sidewall of the insulating cover and the large-surface engraved adhesive of the battery cell, also causing the aforementioned stress concentration issue. Furthermore, the insulating cover occupies a large diameter, resulting in a significant loss in the overall energy density of the battery cell.

[0076] To this end, the present application improves the structure of the battery cell.

[0077] In the battery cell embodiments provided herein, a gap is provided between the first insulating adhesive adhered to the outer periphery of the main body and the second insulating adhesive adhered to the first tab along the axial direction of the main body. This gap reduces the formation of steps, thereby reducing stress concentration points when the battery cell expands, reducing the likelihood of problems such as tab breakage, and ultimately improving battery safety.

[0078] The battery cells disclosed in the embodiments of this application can be used, but are not limited to, in electrical equipment such as vehicles, ships, or aircraft. A power supply system comprising the battery cells and batteries disclosed in this application can be used to alleviate and automatically regulate deterioration in cell expansion, replenish electrolyte consumption, and improve battery performance stability and battery life.

[0079] An embodiment of the present application provides an electrical device using a battery as a power source, wherein the battery is configured to provide electrical energy to the electrical device. The electrical device may be, but is not limited to, a mobile phone, a portable device, a laptop computer, an electric vehicle, an electric car, a ship, a spacecraft, an electric toy, and an electric tool, etc. For example, the spacecraft includes an airplane, a rocket, a space shuttle, and a spacecraft, etc. The electric toy includes a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc. The electric tool includes a metal cutting power tool, a grinding power tool, an assembly power tool, and a railway power tool, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator, and an electric planer.

[0080] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device according to an embodiment of the present application.

[0081] Please refer to Figure 1, which is a structural schematic diagram of a vehicle 1000 provided in some embodiments of the present application. The vehicle 1000 can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000, and the battery 100 can be provided at the bottom, head or tail of the vehicle 1000. The battery 100 can be used to power the vehicle 1000. For example, the battery 100 can serve as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The battery 100 is used to provide electrical energy for the operation of the motor 300 and other components in the vehicle. The controller 200 is used to control the operation of the motor 300, for example, for the starting, navigation and driving power requirements of the vehicle 1000.

[0082] In some embodiments of the present application, the battery 100 can serve not only as an operating power source for the vehicle 1000, but also as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0083] Please refer to Figure 2, which is an exploded view of a battery 100 provided in some embodiments of the present application. The battery 100 includes a housing 10 and a battery cell 20, with the battery cell 20 housed within the housing 10. The housing 10 is used to provide a storage space for the battery cell 20, and the housing 10 can adopt a variety of structures. In some embodiments, the housing 10 can include a first cover 101 and a second cover 102, which cover each other and together define a storage space for the battery cell 20. The second cover 102 can be a hollow structure with one end open. The first cover 101 can be a plate-like structure, which covers the open side of the second cover 102, so that the first cover 101 and the second cover 102 jointly define a storage space. The first cover 101 and the second cover 102 can also both be hollow structures with one end open, with the open side of the first cover 101 covering the open side of the second cover 102. Of course, the box body 10 formed by the first cover body 101 and the second cover body 102 can be in various shapes, such as a cylinder, a cuboid, etc.

[0084] In the battery 100, there may be multiple battery cells 20, and the multiple battery cells 20 may be connected in series, in parallel, or in a hybrid connection. A hybrid connection refers to a combination of series and parallel connections among the multiple battery cells 20. The multiple battery cells 20 may be directly connected in series, in parallel, or in a hybrid connection, and then the entire battery cell 20 may be housed within the housing 10. Alternatively, the battery 100 may be constructed by first connecting multiple battery cells 20 in series, in parallel, or in a hybrid connection to form a battery module, which is then connected in series, in parallel, or in a hybrid connection to form a complete battery module, and then housed within the housing 10. The battery 100 may also include other structures, such as a busbar assembly for electrically connecting the multiple battery cells 20.

[0085] The battery cells 20 include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, and the present disclosure does not limit this. The battery cells may be cylindrical, flat, rectangular, or have other shapes, and the present disclosure does not limit this. Battery cells are generally categorized into three types based on packaging: cylindrical, prismatic, and soft-pack battery cells, and the present disclosure does not limit this either.

[0086] Please refer to Figures 3 to 5. In the embodiment of the present application, the battery cell 20 includes a main body 1, a first electrode tab 2, a first insulating glue 3 and a second insulating glue 4. The first electrode tab 2 is formed at the axial end of the main body 1, the first insulating glue 3 is adhered to the outer periphery of the main body 1, and the second insulating glue 4 is adhered to the first electrode tab 2. In the axial direction of the main body 1, there is a gap 5 between the first insulating glue 3 and the second insulating glue 4.

[0087] As shown in Figures 3 to 5 , a battery cell 20 includes an electrode assembly, which is the component within the battery cell 20 where the electrochemical reaction occurs. The electrode assembly comprises a main body 1 and first and second tabs 2 and 7 extending from the axial ends of the main body 1, respectively. The main body 1 comprises a positive electrode sheet, a negative electrode sheet, and a separator, which are wound together to form the main body 1.

[0088] In some embodiments provided herein, the first tab 2 and the second tab 7 are both full tab structures. The first tab 2 and the second tab 7 are formed at both axial ends of the main body 1 by a flattening process. The diameters of the first tab 2 and the second tab 7 are substantially equal to the diameter of the main body 1.

[0089] In the embodiment provided in the present application, by setting a gap 5 between the first insulating glue 3 and the second insulating glue 4 in the axial direction of the main body 1, the formation of steps between the first insulating glue 3 and the second insulating glue 4 can be reduced, thereby reducing stress concentration points when the battery cell expands, reducing the occurrence of problems such as pole piece breakage, and helping to improve the safety of the battery.

[0090] In some embodiments, the gap 5 extends along the circumference of the main body 1. In other words, the gap 5 is arranged in an annular shape, surrounding the circumference of the main body 1. This arrangement provides a benefit: there is no overlap between the first insulating adhesive 3 and the second insulating adhesive 4 along the circumference of the main body 1. Consequently, there is no overlap between the first insulating adhesive 3 and the second insulating adhesive 4, resulting in no steps. This minimizes stress concentration points during battery cell expansion, preventing problems such as fracture of the battery cell pole pieces.

[0091] In other embodiments, multiple gaps 5 are spaced apart along the circumference of the main body 1. That is, the gaps 5 are not continuous but intermittent along the circumference of the main body 1. Compared to a scheme where the first insulating adhesive 3 and the second insulating adhesive 4 completely overlap along the circumference of the main body 1, providing multiple, spaced gaps 5 can reduce the area of ​​stress concentration, thereby reducing the magnitude of concentrated stress and improving the problem of pole piece fracture.

[0092] In some embodiments, the width of the gap 5 in the axial direction of the main body 1 is 1 mm to 2 mm.

[0093] Setting the width of the gap 5 to 1 mm to 2 mm, such as 1 mm, 1.3 mm, 1.5 mm, 1.8 mm or 2 mm, can not only reduce the stress concentration point when the battery cell expands and avoid problems such as breakage of the battery cell electrode, but also enable the electrode assembly to have the largest possible insulation coverage range and improve the insulation performance.

[0094] In some embodiments, in the axial direction of the main body 1 , the width of the gap 5 is fixed or variable along the circumferential direction.

[0095] Setting the width of gap 5 to be fixed along the circumference can keep the width of gap 5 uniform, improving the product's aesthetic appearance and overall integrity. Setting the width of gap 5 to vary along the circumference can reduce the difficulty of attaching the first insulating adhesive 3 and the second insulating adhesive 4, improving the attachment efficiency.

[0096] In some embodiments, the second insulating adhesive 4 has a greater puncture resistance than the first insulating adhesive 3 .

[0097] The first tab 2 is usually made of aluminum foil material and is more fragile than the main body 1. Therefore, setting the puncture resistance of the second insulating glue 4 to be greater than the puncture resistance of the first insulating glue 3 can more effectively protect the first tab 2 and prevent the first tab 2 from being damaged.

[0098] Puncture resistance is an important property of insulating adhesive, that is, the ability of insulating adhesive to resist puncture by external force, which can also be called "puncture resistance" or "puncture resistance strength".

[0099] The puncture resistance of the insulating adhesive can be improved by adjusting the thickness of the insulating adhesive, or by adding an intermediate layer or thickening the material structure of the intermediate layer.

[0100] Puncture resistance refers to the maximum force required for a puncture needle of specified specifications or size to penetrate the test sample, or the maximum force value during the puncture process, generally expressed in N.

[0101] The puncture resistance measurement method can be: fix the samples of the first insulating glue 3 and the second insulating glue 4 respectively between two clamping rings (puncture resistance clamps), and puncture the center position of the sample perpendicularly at a constant speed with a puncture needle, and record the force value during puncture.

[0102] Alternatively, the puncture resistance of the second insulating adhesive 4 can be measured using an electronic tensile testing machine. The specific measurement method is as follows: Use a sampler to cut five samples of the second insulating adhesive 4 with a diameter of 100 mm; clamp the samples to a dedicated puncture test fixture and secure the fixture to the testing equipment; set test information such as the test speed and sample thickness; and click the Start Test option to begin the test. The electronic tensile testing machine will automatically calculate and display the final test results.

[0103] As shown in FIG. 6 to FIG. 8 , in some embodiments, in the circumferential direction of the first electrode tab 2 , the head and tail of the second insulating glue 4 have an overlapping portion 43 .

[0104] The overlapping portion 43 allows the head and tail of the second insulating adhesive 4 to be bonded together, forming a closed loop circumferentially, providing 360° all-around insulation protection for the first tab 2. This also effectively improves the bonding strength of the second insulating adhesive 4, making it more firmly adhered to the first tab 2. Furthermore, the second insulating adhesive 4 typically has a certain degree of elasticity. The overlapping portion 43, bonding the head and tail of the second insulating adhesive 4 together, prevents the second insulating adhesive 4 from retracting due to reduced or absent elasticity, thereby preventing it from losing its protection of the first tab 2.

[0105] In some embodiments, in the circumferential direction of the first electrode tab 2 , the length of the overlapping portion 43 is 5 mm to 10 mm.

[0106] Setting the circumferential length of the overlapping portion 43 to 5 mm to 10 mm, such as 5 mm, 6 mm, 7 mm, 8 mm, 9 mm or 10 mm, can better enhance the stability of the second insulating adhesive 4 and avoid stress concentration caused by the excessive circumferential length of the overlapping portion.

[0107] Moreover, compared with the solution in which the first insulating glue 3 and the second insulating glue 4 have overlapping parts, the overlapping part 43 includes two layers of the second insulating glue 4 without superimposing the first insulating glue 3. Therefore, even if there is an overlapping part 43, the possibility of causing stress concentration is relatively small.

[0108] As shown in FIG. 6 , in some embodiments, in the circumferential direction of the first electrode tab 2 , the head edge line and the tail edge line of the second insulating glue 4 are parallel.

[0109] In the above embodiment, the head edge line and the tail edge line of the second insulating adhesive 4 are parallel, which can improve the overall aesthetics of the second insulating adhesive 4, and the overlapping part 43 formed after pasting can be a regular rectangle, which is more beautiful and regular as a whole.

[0110] As shown in FIG. 7 , in some embodiments, in the circumferential direction of the first electrode tab 2 , the head edge line and / or the tail edge line of the second insulating glue 4 are inclined relative to the axis of the main body 1 .

[0111] In the above embodiment, three implementation methods are included: one is that the head edge line of the second insulating glue 4 is inclined relative to the axis of the main body 1; the second is that the tail edge line of the second insulating glue 4 is inclined relative to the axis of the main body 1; the third is that both the head edge line and the tail edge line of the second insulating glue 4 are inclined relative to the axis of the main body 1.

[0112] By setting the head edge line and / or tail edge line of the second insulating glue 4 to be inclined relative to the axis of the main body 1, the center line of the overlapping part 43 can be inclined relative to the axis of the main body 1, thereby increasing the length of the center line of the overlapping part 43. When the second insulating glue 4 retracts due to the decrease in elastic force, the ability of the overlapping part 43 to resist the shrinkage force can be increased, thereby improving the adhesion firmness of the second insulating glue 4.

[0113] As shown in Figure 8 , in some embodiments, the upper layer of the overlapping portion 43 is misaligned relative to the lower layer. This embodiment allows for the tail of the second insulating adhesive 4 to be misaligned during application, effectively improving operational efficiency by providing a certain degree of tolerance for operational errors without compromising insulation and protection. Furthermore, this misalignment can also be caused by manufacturing errors in the second insulating adhesive 4 , allowing for a certain degree of manufacturing error in the second insulating adhesive 4 , reducing the manufacturing precision requirements for the second insulating adhesive 4 and thus effectively controlling costs.

[0114] In some embodiments, the second insulating adhesive 4 includes a first adhesive portion 41 and a second adhesive portion 42 . The first adhesive portion 41 is circumferentially adhered to the outer periphery of the first tab 2 , and the second adhesive portion 42 is adhered to the end surface of the first tab 2 away from the main body 1 .

[0115] By providing the first adhesive portion 41 and the second adhesive portion 42 , the first adhesive portion 41 can be circumferentially adhered to the outer periphery of the first electrode tab 2 , and the second adhesive portion 42 can be adhered to the end face of the first electrode tab 2 away from the main body 1 , thereby providing multi-directional protection for the first electrode tab 2 .

[0116] The second adhesive portion 42 can protect the end surface of the first tab 2 to prevent the end surface of the first tab 2 from rising beyond the height of the first adhesive portion 41 and overlapping with the housing, thereby causing a short circuit.

[0117] In some embodiments, the battery cell 20 further includes a first current collecting plate 6 disposed on an end surface of the first electrode tab 2 away from the main body 1 , and the second adhesive portion 42 is adhered to the first current collecting plate 6 .

[0118] An active material layer is formed on the first current collecting disk 6 , and the first current collecting disk 6 collects the current generated by the active material layer to form a larger current for external output.

[0119] By adhering the second adhesive portion 42 to the first current collecting disk 6 , the second adhesive portion 42 can completely wrap the portion of the first electrode tab 2 exposed outside the first current collecting disk 6 , thereby achieving more comprehensive protection for the first electrode tab 2 .

[0120] In some embodiments, the first collecting disk 6 is coaxially arranged with the main body 1 , and a diameter of the first collecting disk 6 is smaller than a diameter of the main body 1 .

[0121] When installing the first collecting disc 6, if there is a manufacturing error in the first collecting disc 6, in order to ensure that the first collecting disc 6 and the main body 1 are coaxial, the first collecting disc 6 may radially extend beyond the main body 1 after installation. In this case, when the main body 1 and the first collecting disc 6 are placed into the shell 9, the first collecting disc 6 will rub against the shell 9. Therefore, setting the diameter of the first collecting disc 6 to be smaller than the diameter of the main body 1 can effectively avoid the problem of the first collecting disc 6 rubbing against the shell 9 when the main body 1 and the first collecting disc 6 are placed into the shell 9 together.

[0122] The first tab 2 is located between the first current collecting disc 6 and the main body 1. When the diameter of the first current collecting disc 6 is smaller than that of the main body 1, the portion of the end of the first tab 2 not covered by the first current collecting disc 6 is exposed. If this exposed portion of the tab is not completely covered and wrapped by the second adhesive portion 42, it may bulge upward, affecting the structure of the first tab 2 and may also contact other components and cause a short circuit risk. Moreover, a tab piece in the exposed portion may also warp, and contact with other components may cause a short circuit and other risks. Therefore, affixing the second adhesive portion 42 to the first current collecting disc 6 can effectively prevent the exposed portion of the first tab 2 not covered by the first current collecting disc 6 from bulging or warping, damaging the tab structure or causing a short circuit risk.

[0123] In some embodiments, the first adhesive portion 41 and the second adhesive portion 42 are connected or integrally formed.

[0124] By connecting or integrally forming the first adhesive portion 41 and the second adhesive portion 42, the first adhesive portion 41 and the second adhesive portion 42 can be connected as a whole. When applying the second insulating adhesive 4, the first adhesive portion 41 and the second adhesive portion 42 can cooperate with each other to achieve a better adhesive effect. For example, the first adhesive portion 41 can be first adhered to the outer periphery of the first tab 2, and then the second adhesive portion 42 can be adhered to the end surface of the first tab 2 using a smoothing device.

[0125] In some embodiments, the viscosity of the second adhesive portion 42 is greater than the viscosity of the first adhesive portion 41 .

[0126] When the second adhesive portion 42 is bent inward 90° from a position parallel to the axis of the main body 1 and adhered to the end surface of the first electrode tab 2, wrinkles will occur on the second adhesive portion 42, and air may enter the wrinkled portion. The colloid in the second adhesive portion 42 will be dehydrated due to air drying, thereby weakening the viscosity. The first adhesive portion 41 is adhered to the outer periphery of the first electrode tab 2 and is relatively flat after adhesion. The chance of air entering is small, and therefore the probability of weakening the viscosity due to dehydration is also small. Therefore, setting the viscosity of the second adhesive portion 42 to be greater than the viscosity of the first adhesive portion 41 can ensure that the second adhesive portion 42 still has sufficient viscosity to remain on the end surface of the first electrode tab 2 after the viscosity is weakened due to dehydration.

[0127] In addition, since the second adhesive portion 42 is bent and flattened on the end surface of the first tab 2, the elastic force of the second adhesive portion 42 will decrease over time, and there is a risk of retraction. Therefore, setting the viscosity of the second adhesive portion 42 to be greater than the viscosity of the first adhesive portion 41 can make the second adhesive portion 42 have a greater ability to resist the reduction of elastic force and retraction, thereby preventing the second adhesive portion 42 from failing in adhesion.

[0128] The viscosity of the first adhesive portion 41 is lower than that of the second adhesive portion 42. When the first adhesive portion 41 is not pasted properly and fails to meet the requirements and needs to be reworked, the first adhesive portion 41 can be easily torn off without sticking to the material of the main body 1, making it easy to re-paste.

[0129] In some embodiments, the first adhesive portion 41 may be made of hot melt adhesive, and the second adhesive portion 42 may be made of acrylic adhesive.

[0130] Viscosity is a physical measure of viscous forces. It reflects the strength of the interactions between fluid molecules during motion. The relative movement of adjacent fluid layers during fluid flow creates frictional resistance between these two layers, known as viscous drag.

[0131] The viscosity is affected by temperature. When the temperature rises, the distance between liquid molecules increases, which reduces the intermolecular attraction and the internal friction, resulting in a decrease in the viscosity of the colloid.

[0132] The viscosity of insulating glue can be tested using the following three methods.

[0133] 1. Initial adhesion: This is to test the ability of the insulating adhesive to initially adhere to the adherend. The general method is to use a national standard steel ball to roll down naturally on the insulating adhesive tilted at a 45-degree angle, and increase the size of the steel ball in turn. The larger the steel ball that can be adhered, the greater the initial adhesion.

[0134] 2. Adhesion retention: This refers to the ability of the insulating adhesive to maintain its adhesion after it has completely adhered to an object. Test Principle: A test plate with an adhesive specimen attached is vertically hung on a test stand, with a weight of a specified weight suspended from the lower end. The specimen's ability to resist pull-off is measured by the amount of displacement after a certain period of time, or the time it takes for the specimen to completely detach.

[0135] 3. The peeling force of insulating adhesive, also called adhesion force: refers to the average force required to peel off the insulating adhesive at a certain speed after the insulating adhesive is attached to the adherend. The peeling force affects the separation force between the object and the adhered object. The greater the peeling force, the more difficult it is to separate the object from the surface of another object. If the peeling force is too small, it will affect the bonding performance of the insulating adhesive. The test method for peeling force: Use insulating adhesive of standard width to stick to a specific steel plate, and then use a robot to tear the insulating adhesive from the steel plate. The stable force of the robot reflects the peeling force. Principle of insulating adhesive peeling strength: Two pieces of adhered materials are prepared into a bonding sample with adhesive, and then the bonding sample is peeled off from the bonding opening at a specified rate. The two adherends are gradually separated along the length of the adhered surface.

[0136] In some embodiments, the ratio of the width of the first adhesive portion 41 in the axial direction of the main body 1 to the width of the second adhesive portion 42 in the direction perpendicular to the axis of the main body 1 is 1:1 to 2:1.

[0137] By setting the ratio of the width of the first adhesive portion 41 in the axial direction of the main body 1 to the width of the second adhesive portion 42 in the direction perpendicular to the axis of the main body 1 to 1:1 to 2:1, relatively comprehensive protection of the first electrode tab 2 can be achieved, and a reasonable distribution of the periphery and end face of the first electrode tab 2 can be achieved while saving costs.

[0138] As shown in FIG. 9 and FIG. 10 , in some embodiments, the second insulating adhesive 4 is provided with an indicator line 44 , and the indicator line 44 separates the second insulating adhesive 4 into a first adhesive portion 41 and a second adhesive portion 42 .

[0139] By providing the indicator line 44, the range of the first pasting portion 41 and the second pasting portion 42 can be quickly identified by the indicator line 44 when pasting the second insulating adhesive 4. The indicator line 44 can effectively improve pasting efficiency as an operation aid.

[0140] In some embodiments, the color of the indicator line 44 is different from the color of the second insulating adhesive 4 .

[0141] By setting the color of the indicator line 44 to be different from the color of the second insulating glue 4, the indicator line 44 can be made more eye-catching, making it easier for operators to identify its location.

[0142] In some embodiments, the second adhesive portion 42 includes a substrate and an adhesive backing disposed on the substrate, and the color of at least one of the substrate and the adhesive backing is set to a color that can prevent reflection when the width of the second adhesive portion 42 is detected.

[0143] By setting the color of at least one of the substrate and the backing adhesive to a color that can prevent reflection when detecting the width of the second adhesive portion 42, it is possible to prevent reflection from occurring due to the light color of the substrate and the backing adhesive when detecting the width of the second adhesive portion 42, thereby affecting the accuracy of the test.

[0144] For example, at least one of the substrate and the adhesive can be set to a darker color, such as black or brown.

[0145] In some embodiments, the battery cell 20 further includes a shell 9 having a receiving cavity, the main body 1 and the first tab 2 are disposed in the receiving cavity, and the material used for the shell 9 is configured to prevent the shell 9 from contacting the negative electrode of the battery cell 20 and causing corrosion.

[0146] When the main body 1 is wound, the anode material usually wraps the cathode material, so the anode material is usually located on the outer circle. Since there is a gap 5 between the first insulating glue 3 and the second insulating glue 4, the gap 5 will cause the anode material (i.e., the negative electrode part) of the main body 1 or the first tab 2 to have an exposed portion. If the exposed portion bulges or warps, it may contact the shell 9 and cause corrosion to the shell 9. Therefore, the material of the shell 9 is set to a material that can prevent the shell 9 from contacting the negative electrode of the battery cell 20 and causing corrosion. This can prevent the exposed portion from bulging or warping and contacting the shell 9 and causing corrosion. For example, when the negative electrode of the battery contacts the aluminum shell, under certain conditions, the aluminum shell of the battery will corrode, causing battery leakage.

[0147] In some embodiments provided herein, the housing 9 can be made of stainless steel or plastic. The steel housing is neutral or negatively charged and will not be corroded even if it comes into contact with the negative electrode of the battery.

[0148] The housing 9 is a component for providing a storage space for accommodating the electrode assembly, electrolyte, and other components. The housing 9 includes a housing body having an opening and an end cap for closing the opening. The housing body and the end cap can be independent components. The housing body is provided with an opening, and the end cap is closed at the opening to form the internal environment of the battery cell 20. The end cap and the housing body can also be integrated. Specifically, the end cap and the housing body can form a common connection surface before other components are installed in the housing. When the interior of the housing body needs to be encapsulated, the end cap is closed to the housing body, and the housing body and the end cap are encapsulated as one.

[0149] The container body is a component that works with the end caps to define the internal environment of the battery cell 20. The end caps are components that cover the openings of the container body to isolate the internal environment of the battery cell 20 from the external environment. The shape of the end caps can be adapted to the shape of the container body to complement the container body. Optionally, the end caps can be made of a material with a certain hardness and strength. This prevents deformation when squeezed and expanded, providing the battery cell 20 with greater structural strength and improved safety.

[0150] In some embodiments, the end cap may also be provided with a pressure relief mechanism for releasing the internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold value.

[0151] The shell 9 can be in various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism shape, etc. Specifically, the shape of the shell 9 can be determined according to the specific shape and size of the electrode assembly.

[0152] The present application also provides a battery 100 , which includes a box and the above-mentioned battery cell 20 . The battery cell 20 is disposed in the box and is used to provide electrical energy.

[0153] The present application also provides an electrical device, including the above-mentioned battery cell 20, the battery cell 20 is used to supply electric energy to the electrical device; or, including the above-mentioned battery 100, the battery 100 is used to supply electric energy to the electrical device.

[0154] The structure of an embodiment of a battery cell provided by the present application is described below with reference to Figures 3 to 10 .

[0155] As shown in Figures 3 to 5, the battery cell 20 includes a main body 1, a first electrode tab 2, a first insulating glue 3, a second insulating glue 4, a first current collecting plate 6, a second electrode tab 7, a second current collecting plate 8, a shell 9, an insulating member 11, a sealing ring 12, a pole 13 and a sealing nail 14.

[0156] The main body 1, first tab 2, and second tab 7 are all cylindrical in shape. They are formed at opposite axial ends of the main body 1 through a flattening process. The first and second current collecting discs 6 and 8 are both disc-shaped. Furthermore, the main body 1, first tab 2, second tab 7, first and second current collecting discs 6 and 8 are coaxially arranged.

[0157] The main body 1 , the first electrode tab 2 , the first current collecting disc 6 , the second electrode tab 7 , the second current collecting disc 8 and the insulating member 11 are all disposed in the inner cavity of the housing 9 .

[0158] The second current collecting tray 8 is mounted on the end face of the second electrode tab 7 facing away from the main body 1. An insulator 11 is positioned between the first current collecting tray 6 and the top end cap of the housing 9. The top end cap of the housing 9 has mounting holes, into which the pole 13 is mounted. A sealing ring 12 is positioned between the pole 13 and the end cap. A sealing pin 14 is positioned in the center of the pole 13. A liquid filling port 15 is provided on the first current collecting tray 6.

[0159] A first insulating adhesive 3 is adhered to the outer periphery of the main body 1. A second insulating adhesive 4 is adhered to the outer periphery and end face of the first tab 2. Furthermore, a first current collecting plate 6 is disposed on the end face of the first tab 2 away from the main body 1, with one end of the second insulating adhesive 4 adhered to the first current collecting plate 6.

[0160] In the axial direction of the main body 1 , there is a gap 5 between the first insulating adhesive 3 and the second insulating adhesive 4 . The gap 5 extends in a ring shape along the circumference of the main body 1 .

[0161] In this embodiment, the top of the first insulating adhesive 3 is attached to 80% to 85% of the height of the main body 1, and the bottom is attached to 15% to 20% of the height of the main body 1. The distance between the top of the first insulating adhesive 3 and the top surface of the first tab 2 is approximately 10 mm.

[0162] 6 , the second insulating adhesive 4 includes a first adhesive portion 41 adhered to the outer periphery of the first tab 2 and a second adhesive portion 42 adhered to the end surface of the first tab 2. In the circumferential direction, the head and tail of the second insulating adhesive 4 overlap to form an overlapping portion 43.

[0163] In the embodiment shown in FIG. 6 , the overlapping portion 43 is rectangular, and the side line of the overlapping portion 43 is perpendicular to the axis of the main body 1 .

[0164] In the embodiment shown in FIG. 7 , the overlapping portion 43 is in the shape of a parallelogram, and both the head side line and the tail side line of the second insulating adhesive 4 are inclined relative to the axis of the main body 1 .

[0165] 8 , the upper layer of the overlapping portion 43 is offset relative to the lower layer. The top edge of the upper layer is above the top edge of the lower layer, and the bottom edge of the lower layer is also above the bottom edge of the lower layer.

[0166] As shown in FIG9 , the head edge line and the tail edge line of the second insulating adhesive 4 are both parallel to the axis of the main body 1 .

[0167] As shown in FIG. 10 , the head edge line and the tail edge line of the second insulating adhesive 4 are both inclined relative to the axis of the main body 1 .

[0168] The second insulating adhesive 4 is further provided with an indicator line 44 for distinguishing the first adhesive portion 41 from the second adhesive portion 42 . One side of the indicator line 44 is the first adhesive portion 41 , and the other side is the second adhesive portion 42 .

[0169] In this embodiment, a gap 5 is provided between the first insulating adhesive 3 and the second insulating adhesive 4 so that the first insulating adhesive 3 and the second insulating adhesive 4 do not overlap on the side surface of the battery cell. This can avoid the first insulating adhesive 3 and the second insulating adhesive 4 from overlapping to form a step due to a thickness difference. This can also avoid the stress formed there at this point after the battery cell electrode pieces expand during charge and discharge, which could lead to the fracture of the outer electrode pieces of the battery cell.

[0170] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and components may be substituted with equivalents without departing from the scope of the present application. In particular, the various technical features described in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions within the scope of the claims.

Claims

1. A battery cell (20), comprising: A main body (1); A first pole lug (2) formed at an axial end of the main body (1); A first insulating adhesive (3) is adhered to the outer periphery of the main body (1); and A second insulating adhesive (4) is adhered to the first electrode tab (2); Wherein, in the axial direction of the main body (1), there is a gap (5) between the first insulating glue (3) and the second insulating glue (4).

2. The battery cell (20) according to claim 1, wherein: The gap (5) extends along the circumference of the main body (1).

3. The battery cell (20) according to claim 1 or 2, wherein: In the axial direction of the main body (1), the width of the gap (5) is 1 mm to 2 mm.

4. The battery cell (20) according to any one of claims 1 to 3, wherein: In the axial direction of the main body (1), the width of the gap (5) is fixed or variable along the circumferential direction.

5. The battery cell (20) according to any one of claims 1 to 4, wherein: The puncture resistance of the second insulating adhesive (4) is greater than the puncture resistance of the first insulating adhesive (3).

6. The battery cell (20) according to any one of claims 1 to 5, wherein: In the circumferential direction of the first pole lug (2), the head and tail of the second insulating glue (4) have an overlapping portion (43).

7. The battery cell (20) according to claim 6, wherein: In the circumferential direction of the first pole lug (2), the length of the overlapping portion (43) is 5 mm to 10 mm.

8. The battery cell (20) according to claim 6 or 7, wherein: The upper layer of the overlapping portion (43) is offset relative to the lower layer.

9. The battery cell (20) according to any one of claims 1 to 8, wherein: In the circumferential direction of the first pole lug (2), the head edge line and the tail edge line of the second insulating glue (4) are parallel.

10. The battery cell (20) according to any one of claims 1 to 9, wherein: In the circumferential direction of the first pole lug (2), the head edge line and / or the tail edge line of the second insulating glue (4) are inclined relative to the axis of the main body (1).

11. The battery cell (20) according to any one of claims 1 to 10, wherein: The second insulating adhesive (4) comprises a first adhesive portion (41) and a second adhesive portion (42), wherein the first adhesive portion (41) is circumferentially adhered to the outer periphery of the first pole lug (2), and the second adhesive portion (42) is adhered to the end surface of the first pole lug (2) away from the main body (1).

12. The battery cell (20) according to claim 11, wherein: It also comprises a first current collecting plate (6) arranged on the end surface of the first pole lug (2) away from the main body (1), and the second adhesive portion (42) is adhered to the first current collecting plate (6).

13. The battery cell (20) according to claim 11 or 12, wherein: The first adhesive portion (41) and the second adhesive portion (42) are connected or integrally formed.

14. The battery cell (20) according to any one of claims 11 to 13, wherein: The viscosity of the second adhesive portion (42) is greater than the viscosity of the first adhesive portion (41).

15. The battery cell (20) according to any one of claims 11 to 14, wherein: The ratio of the width of the first adhesive portion (41) in the axial direction of the main body (1) to the width of the second adhesive portion (42) in the direction perpendicular to the axial direction of the main body (1) is 1:1 to 2:

1.

16. The battery cell (20) according to any one of claims 11 to 15, wherein: The second insulating adhesive (4) is provided with an indicator line (44), and the indicator line (44) divides the second insulating adhesive (4) into the first adhesive portion (41) and the second adhesive portion (42).

17. The battery cell (20) according to claim 16, wherein: The color of the indicator line (44) is different from the color of the second insulating glue (4).

18. The battery cell (20) according to any one of claims 11 to 17, wherein: The second adhesive portion (42) comprises a substrate and a backing adhesive arranged on the substrate, and the color of at least one of the substrate and the backing adhesive is set to a color that can prevent reflection when detecting the width of the second adhesive portion (42).

19. The battery cell (20) according to any one of claims 11 to 18, wherein: The invention also comprises a shell (9), wherein the shell (9) has a receiving cavity, wherein the main body (1) and the first electrode tab (2) are arranged in the receiving cavity, and the material used for the shell (9) is configured to prevent the shell (9) from contacting with the negative electrode of the battery cell (20) and thus causing corrosion.

20. A battery (100), comprising a housing and a battery cell (20) according to any one of claims 1 to 19, wherein the battery cell (20) is arranged in the housing, and the battery cell (20) is used to provide electrical energy.

21. An electrical device, comprising a battery cell (20) as claimed in any one of claims 1 to 19, wherein the battery cell (20) is used to supply electrical energy to the electrical device; or, comprising a battery (100) as claimed in claim 20, wherein the battery (100) is used to supply electrical energy to the electrical device.

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