Battery cells, batteries and power consumption devices

Abstract

A battery cell, a battery, and a power-consuming device, wherein the battery cell includes a body, a first tab, a first insulating adhesive, and a second insulating adhesive, the first tab being formed at the axial end of the body, the first insulating adhesive being attached to the outer circumference of the body, and the second insulating adhesive being attached to the first tab, with a gap between the first insulating adhesive and the second insulating adhesive in the axial direction of the body. A battery includes a battery cell. A power-consuming device includes a battery cell or a battery.

Description

Technical Field

[0001] This application is based on and claims the priority of an application with a Chinese application number of 202310970192.8 and a filing date of August 3, 2023. The disclosure content of this Chinese application is incorporated into this application in its entirety.

[0002] The present invention relates to the field of battery technology, and particularly to battery cells, batteries, and power-consuming devices.

Background Art

[0003] Energy conservation and reduction of pollutant emissions are the keys to the sustainable development of the automotive industry. Electric vehicles have become an important component of the sustainable development of the automotive industry due to their energy conservation and environmental protection advantages. However, for electric vehicles, battery technology is an important factor related to their development.

[0004] Since the battery is constantly charged or discharged during use, insulation is very important for the battery. An insulating adhesive is generally attached to the outside of the battery core, and the attachment method of the insulating adhesive affects the overall performance of the battery.

[0005] The above description is only for providing background technical information related to this application, and does not necessarily constitute prior art.

Summary of the Invention

[0006] This application provides a battery cell, a battery, and a power-consuming device.

[0007] According to a first aspect, this application provides a battery cell including a main body portion, a first tab, a first insulating adhesive, and a second insulating adhesive. The first tab is formed at an axial end of the main body portion. The first insulating adhesive is attached to the outer periphery of the main body portion. The second insulating adhesive is attached to the first tab. Here, in the axial direction of the main body portion, there is a gap between the first insulating adhesive and the second insulating adhesive.

[0008] In the embodiment of this application, by providing a gap between the first insulating adhesive and the second insulating adhesive in the axial direction of the main body, the formation of a step difference between the first insulating adhesive and the second insulating adhesive can be reduced. Furthermore, this reduces stress concentration points when the battery cell expands, reduces the occurrence of problems such as electrode plate fracture, and is advantageous in improving the safety of the battery.

[0009] In some embodiments, the gap extends along the circumferential direction of the main body. The advantage of this installation is that the first insulating adhesive and the second insulating adhesive do not completely overlap in the circumferential direction of the main body, and therefore there are no contact points between the first and second insulating adhesives, no steps are created, and the stress concentration points when the battery cell expands are significantly reduced, thus avoiding problems such as fracture of the electrode plates of the battery cell.

[0010] In some embodiments, the gap width in the axial direction of the main body is 1 mm to 2 mm.

[0011] Setting the gap width to 1mm to 2mm reduces stress concentration points when the battery cell expands, which not only helps to prevent problems such as fracture of the battery cell's electrode plates, but also allows for the largest possible insulating coverage area on the electrode assembly, thereby improving insulation performance.

[0012] In some embodiments, the width of the gap in the axial direction of the main body is constant or varies along the circumferential direction.

[0013] By setting the gap width to be fixed along the circumferential direction, the gap width can be kept uniform, improving the aesthetic appearance and overall integrity of the product. Setting the gap width to vary along the circumferential direction reduces the difficulty of bonding the first and second insulating adhesives, improving bonding efficiency.

[0014] In some embodiments, the puncture resistance of the second insulating adhesive is greater than that of the first insulating adhesive.

[0015] Since the first tab is generally manufactured using aluminum foil material and is more vulnerable to the main body, setting the puncture resistance of the second insulating adhesive to be greater than that of the first insulating adhesive can more effectively protect the first tab and prevent it from being damaged.

[0016] In some embodiments, the head and tail portions of the second insulating adhesive have an overlapping portion in the circumferential direction of the first tab.

[0017] By providing an overlapping portion, the head and tail of the second insulating adhesive can be bonded together, forming a closed loop in the circumferential direction of the second insulating adhesive, providing omnidirectional insulating protection to the first tab, and further effectively improving the adhesive strength of the second insulating adhesive, allowing the second insulating adhesive to adhere more firmly to the first tab. Moreover, generally, the second insulating adhesive has a certain elasticity, and by providing an overlapping portion, the head and tail of the second insulating adhesive are bonded together, preventing the second insulating adhesive from retracting due to a decrease or loss of elasticity, thus preventing the loss of protection to the first tab.

[0018] In some embodiments, the length of the overlapping portion in the circumferential direction of the first tab is 5 mm to 10 mm.

[0019] Setting the circumferential length of the overlapping portion to 5mm to 10mm can effectively reinforce the stability of the second insulating adhesive and also avoid stress concentration caused by excessively long circumferential lengths of the overlapping portion.

[0020] In some embodiments, the upper layer of the overlapping portion is misaligned relative to the lower layer. This embodiment allows for misalignment of the tail portion of the second insulating adhesive during application, and, assuming that this does not affect the insulating and protective function, it can effectively improve operational efficiency with a certain operational fault tolerance rate. Furthermore, this misalignment may be due to manufacturing tolerances of the second insulating adhesive, thereby allowing the second insulating adhesive to have a certain manufacturing tolerance, reducing the requirements for manufacturing precision of the second insulating adhesive, and thus effectively controlling costs.

[0021] In some embodiments, the head edge line and tail edge line of the second insulating adhesive are parallel in the circumferential direction of the first tab.

[0022] In the above embodiment, the head edge line and tail edge line of the second insulating adhesive are parallel, which improves the overall aesthetic appearance of the second insulating adhesive, and the overlapping portion formed after application may be a regular rectangle, making the overall appearance more beautiful and regular.

[0023] In some embodiments, the head edge and / or tail edge of the second insulating adhesive are inclined with respect to the axis of the main body in the circumferential direction of the first tab.

[0024] By setting the head edge line and / or tail edge line of the second insulating adhesive to be inclined with respect to the axis of the main body, the midline of the overlapping portion can be inclined with respect to the axis of the main body, and the length of the midline of the overlapping portion can be increased, thereby increasing the ability of the second insulating adhesive to resist the contraction force of the overlapping portion when it retracts due to a decrease in elastic force, and improving the adhesive fastness of the second insulating adhesive.

[0025] In some embodiments, the second insulating adhesive includes a first adhesive portion and a second adhesive portion, the first adhesive portion being attached to the outer circumference of the first tab along the circumferential direction, and the second adhesive portion being attached to the end face of the first tab away from the main body.

[0026] By providing the first adhesive portion and the second adhesive portion, the first adhesive portion can be attached to the outer periphery of the first tab along the circumferential direction, and the second adhesive portion is attached to the end face away from the main body portion of the first tab, thereby forming protection in more directions for the first tab.

[0027] By providing the second adhesive portion, the end face of the first tab can be protected, and it can be prevented that a part of the structure of the end face of the first tab protrudes beyond the height of the first adhesive portion and abuts against the case, causing a short circuit.

[0028] In some embodiments, the battery body further includes a first current collecting disc provided on the end face away from the main body portion of the first tab, and the second adhesive portion is attached to the first current collecting disc.

[0029] By attaching the second adhesive portion to the first current collecting disc, the second adhesive portion can completely wrap the portion exposed from the first current collecting disc of the first tab, thereby achieving more comprehensive protection for the first tab.

[0030] In some embodiments, the first adhesive portion and the second adhesive portion are connected or integrally formed.

[0031] By connecting or integrally forming the first adhesive portion and the second adhesive portion, the first adhesive portion and the second adhesive portion can be integrally connected. When attaching the second insulating adhesive, a relatively good attaching effect can be achieved by the mutual fitting of the first adhesive portion and the second adhesive portion. For example, first attach the first adhesive portion to the outer periphery of the first tab, and then use a flattening device to attach the second adhesive portion to the end face of the first tab.

[0032] In some embodiments, the viscosity of the second adhesive portion is greater than the viscosity of the first adhesive portion.

[0033] When the second adhesive portion is bent 90° inward from a position parallel to the axis of the main body and attached to the end face of the first tab, wrinkles may form in the second adhesive portion, and air may get trapped in the wrinkles. The colloid in the second adhesive portion will be dehydrated by the drying of the air, further weakening its adhesive properties. However, the first adhesive portion is attached to the outer circumference of the first tab, and after attachment it is relatively flat, so the opportunity for air to get trapped is relatively small. Therefore, the probability of weakening of adhesive properties due to dehydration is also relatively small. By setting the viscosity of the second adhesive portion to be greater than that of the first adhesive portion, the second adhesive portion will still have sufficient viscosity even after its adhesive properties have weakened due to dehydration, and will be able to hold it to the end face of the first tab.

[0034] Furthermore, since the second adhesive portion is bent and flattened against the end face of the first tab, there is a risk that the elastic force of the second adhesive portion will decrease over time, causing it to retract. By setting the viscosity of the second adhesive portion to be greater than that of the first adhesive portion, the second adhesive portion can be made more resistant to elastic force and reduce retraction, thereby preventing the loss of adhesive function of the second adhesive portion.

[0035] If the viscosity of the first adhesive is lower than that of the second adhesive, and the application of the first adhesive is non-standard and therefore does not meet the requirements, requiring extra effort, the first adhesive can be peeled off relatively easily without adhering to the main body material, making reapplication easier.

[0036] In some embodiments, the ratio of the width of the main body of the first adhesive part in the axial direction to the width of the main body of the second adhesive part in the direction perpendicular to the axis is 1:1 to 2:1.

[0037] By setting the ratio of the axial width of the main body of the first adhesive part to the perpendicular width of the main body of the second adhesive part to 1:1 to 2:1, relatively comprehensive protection for the first tab can be achieved, and a rational allocation to the outer circumference and end face of the first tab can be realized while saving costs.

[0038] In some embodiments, a guide line is provided in the second insulating adhesive, and the guide line divides the second insulating adhesive into a first adhesive portion and a second adhesive portion.

[0039] By providing guide lines, the areas of the first and second adhesive sections can be quickly identified when applying the second insulating adhesive. The guide lines effectively improve application efficiency as an operational aid.

[0040] In some embodiments, the color of the indicator line is different from the color of the second insulating adhesive.

[0041] By setting the color of the indicator line to be different from the color of the second insulating adhesive, the indicator line can be made more prominent, making it easier for workers to recognize its location.

[0042] In some embodiments, the second adhesive portion includes a substrate and a backing adhesive provided on the substrate, and the color of at least one of the substrate and the backing adhesive is set to a color that prevents light reflection when detecting the width of the second adhesive portion.

[0043] By setting at least one of the colors of the substrate and the backing adhesive to a color that prevents light reflection when detecting the width of the second adhesive area, it is possible to prevent light reflection caused by the substrate and backing adhesive being too light in color when detecting the width of the second adhesive area, thereby preventing an impact on the accuracy of the test.

[0044] In some embodiments, the battery cell further includes a case having a housing cavity, the main body and the first tab being installed within the housing cavity, and the material used for the case is configured to prevent the case from corroding by contact with the negative electrode of the battery cell.

[0045] By using a material for the case that prevents the case from corroding by contacting the negative electrode of the battery cell, it is possible to avoid corrosion that occurs when the exposed portion swells or warps and then comes into contact with the case.

[0046] According to a second aspect, the present application provides a battery comprising a housing and the battery cell, wherein the battery cell is installed within the housing and is used to provide electrical energy.

[0047] According to a third aspect, the present application provides a power-consuming device comprising the above-mentioned battery cell, the battery cell being used to supply electrical energy to the power-consuming device, or comprising the above-mentioned battery, the battery being used to supply electrical energy to the power-consuming device.

[0048] The above description is merely an outline of the proposed technology of this application. To better understand the technical means of this application, it may be implemented according to the contents of the specification. Furthermore, in order to make the above and other objectives, features, and advantages of this application clearer and easier to understand, the following will describe specific embodiments of this application in particular. [Brief explanation of the drawing]

[0049] To more clearly illustrate the technical concept of the embodiments of this application, the following briefly introduces the drawings that may be used in the embodiments of this application. It is obvious that the drawings in the following description are only a few of the embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without expending any creative effort. [Figure 1] These are schematic diagrams of the structure of several embodiments of the power consumption equipment disclosed in this application. [Figure 2] These are schematic diagrams of the structure of several embodiments of the battery disclosed in this application. [Figure 3] These are schematic diagrams of the structure of several embodiments of the battery cell disclosed in this application. [Figure 4] This is a cross-sectional view along section AA of the embodiment shown in Figure 3. [Figure 5] This is an enlarged view of the portion indicated by the symbol B in Figure 4. [Figure 6] This is a schematic diagram showing the application of the first and second insulating adhesives in some embodiments of the battery cell disclosed in this application. [Figure 7] This is a schematic diagram showing the application of the first insulating adhesive and the second insulating adhesive in some other embodiments of the battery cell disclosed in this application. [Figure 8] This is a schematic diagram showing the application of the first insulating adhesive and the second insulating adhesive in some other embodiments of the battery cell disclosed in this application. [Figure 9] This is a schematic diagram of the structure of the second insulating adhesive in some embodiments of the battery cell disclosed in this application. [Figure 10] This is a schematic diagram of the structure of a second insulating adhesive in some other embodiments of the battery cell disclosed in this application.

[0050] In drawings, the drawings are not drawn to the actual scale. [Modes for carrying out the invention]

[0051] The following describes in detail embodiments of the technical proposal of this application, accompanied by drawings. These embodiments are merely examples, intended to provide a clearer explanation of the technical proposal, and should not be used to limit the scope of protection of this application.

[0052] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art relating to the present application. The terms used herein are solely 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 description of the specification, claims, and drawings of this application are intentionally intended to cover the non-exclusive “including.”

[0053] In the descriptions of the embodiments of this application, technical terms such as "first," "second," etc., are merely used to distinguish different subjects and should not be understood as implicitly indicating or suggesting the relative importance of the number, specific order, or hierarchical relationship of technical features. Furthermore, the term "perpendicular" does not mean strictly perpendicular, but within an acceptable margin of error. Similarly, "parallel" does not mean strictly parallel, but within an acceptable margin of error.

[0054] As used herein, “Examples” means that certain features, structures, or characteristics described in conjunction with the examples may be included in at least one example of this application. The term “Examples” appearing in different parts of the specification does not necessarily refer to the same example, nor does it indicate an example that is exclusively independent or alternative to another example. Those skilled in the art will understand, both explicitly and implicitly, that the examples described herein can be combined with other examples.

[0055] In the description of the embodiments of this application, the term "and / or" merely describes a relationship between related objects, indicating that three relationships may exist. For example, A and / or B may represent three cases: A alone, a combination of A and B, or B alone. In this specification, the letter " / " generally indicates that the preceding and succeeding related objects are in an "or" relationship.

[0056] In the descriptions of the embodiments of this application, unless otherwise specifically defined, the term "multiple" refers to two or more. Similarly, unless otherwise clearly and specifically defined, "multiple sets" refers to two or more sets, and "multiple sheets" refers to two or more sheets.

[0057] In the description of the embodiments of this application, the orientations or positional relationships indicated by technical terms such as "center," "vertical direction," "horizontal direction," "length," "width," "thickness," "top," "bottom," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inside," "outside," "clockwise," "counterclockwise," "axial direction," "radial direction," and "circumferential direction" are orientations or positional relationships shown based on the drawings and are merely for the purpose of facilitating and simplifying the description of the embodiments of this application. They do not indicate or imply that the mentioned devices or elements have a specific orientation or must be configured and operated in a specific orientation, and therefore should not be understood as limitations on the embodiments of this application.

[0058] In the description of the embodiments of this application, unless otherwise explicitly defined or limited, technical terms such as "attachment," "connection," "bonding," and "fixing" should be understood in a broad sense. For example, these may be fixed connections, removable connections, integral connections, mechanical connections, electrical connections, direct connections, indirect connections via an intermediate medium, internal communication between two elements, or interaction relationships between two elements. Those skilled in the art may understand the specific meaning of these terms in the embodiments of this application depending on the specific circumstances.

[0059] Currently, given the development of the market, the applications of power batteries are becoming increasingly broad. Power batteries are used not only in energy storage and power systems such as hydroelectric, thermal, wind, and solar power plants, but also in electric transportation tools such as electric bicycles, electric motorcycles, and electric vehicles, as well as in multiple fields such as military equipment and aerospace. As the application fields of power batteries continue to expand, the market demand for them will also continue to increase.

[0060] Cylindrical battery cells generally employ a full-tab structure. When manufacturing battery cells, after the winding of the battery core is complete, it is necessary to perform further insulation treatment between the battery core and the case after tab molding. There are two common insulation methods: insulation by adhesive bonding and insulation by insulating cover.

[0061] Regarding insulation methods using adhesive bonding, a common adhesive bonding method is overlapping adhesive bonding, where the insulating adhesive bonded to the tab and the large-surface code marking adhesive bonded to the bare cell overlap in height. While this method can protect the entire battery core within the insulating adhesive, the overlapping location of the insulating adhesive bonded to the tab and the large-surface code marking adhesive bonded to the bare cell creates a step of a certain height due to the multi-layer adhesive lamination. Furthermore, because the group margin of cylindrical battery cores (the group margin is the ratio of the battery core diameter to the case diameter) is generally relatively high, and expansion occurs after charging and discharging of the battery core plates, stress concentration points are easily formed at this step in the adhesive overlap. As a result, the outer ring plates of the battery core are prone to loss of function, such as fracture, during the cycle process, leading to capacity loss of the battery core and ultimately a risk of fire.

[0062] Regarding the method of insulation using an insulating cover, generally, an insulating cover with an open top is manufactured in advance using a material such as PET or PP, and during the assembly process of the battery core, the insulating cover is fitted directly onto the tab end of the battery core, thereby forming an isolation layer between the tab and the case, and thus achieving the purpose of insulation.

[0063] However, because the insulating cover material is generally relatively thin, the insulating cover is relatively soft and easily deformed. Considering the manufacturability of the need to place the insulating cover on the end of the battery core, the thickness of the sidewall of the insulating cover is generally relatively large, typically 0.2 mm or more, in order to maintain its own roundness. This still creates a step of a certain height between the sidewall of the insulating cover and the adhesive for the large surface code marking of the battery core, resulting in the aforementioned stress concentration problem. Furthermore, the space occupied by the insulating cover in the diameter space is relatively large, and the overall energy density loss of the battery core is relatively large.

[0064] Therefore, this application improves the structure of the battery cell.

[0065] In the embodiment of the battery cell according to this application, a gap is provided in the axial direction of the main body between the first insulating adhesive attached to the outer circumference of the main body and the second insulating adhesive attached to the first tab. Providing this gap reduces the formation of steps, and further reduces stress concentration points when the battery core expands, thereby reducing the occurrence of problems such as electrode plate fracture and improving the safety of the battery.

[0066] The battery cells disclosed in the embodiments of this application can be used in power-consuming devices such as vehicles, ships, or aircraft, but are not limited to these. A power supply system comprising the battery cells, batteries, etc. disclosed in this application may be used to constitute such power-consuming devices, which is advantageous in mitigating and automatically adjusting the deterioration of the expansion force of the battery core, replenishing electrolyte consumption, and improving the stability of battery performance and battery life.

[0067] Embodiments of this application provide power-consuming devices that use a battery as a power source, wherein the battery is configured to provide electrical energy to the power-consuming devices. Power-consuming devices may be, but are not limited to, mobile phones, portable devices, laptop computers, battery cars, electric vehicles, steamships, aerospace vehicles, electric toys and power tools. For example, aerospace vehicles include airplanes, rockets, space shuttles and spacecraft, etc. Electric toys include stationary or portable electric toys, such as game consoles, electric car toys, electric steamship toys and electric airplane toys, etc. Power tools include metal cutting power tools, polishing power tools, assembly power tools and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, hammer drills, concrete vibrators and electric planers.

[0068] In the following embodiments, for the sake of clarity, we will describe an example in which one of the embodiments of this application is a vehicle 1000.

[0069] Referring to Figure 1, which is a schematic diagram of the structure of a vehicle 1000 according to some embodiments of the present application, the vehicle 1000 may be a gasoline 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 extender vehicle. A battery 100 is installed inside the vehicle 1000, and the battery 100 may be installed at the bottom, head, or tail of the vehicle 1000. The battery 100 may be used to supply power to the vehicle 1000, for example, the battery 100 may be used as the operating power source for the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300, the battery 100 is used to provide electrical energy to operate the motor 300 and other components in the vehicle, and the controller 200 is for controlling the motor 300 to operate and to meet the demands of operating power consumption during, for example, starting the vehicle 1000, navigation, and driving.

[0070] In some embodiments of this application, the battery 100 can not only serve as an operating power source for the vehicle 1000, but can also serve as a driving power source for the vehicle 1000, providing driving power to the vehicle 1000 in place of or in place of fuel oil or natural gas.

[0071] Referring to Figure 2, which is an exploded view of a battery 100 according to some embodiments of the present application, the battery 100 comprises a housing 10 and a battery cell 20, the battery cell 20 being housed within the housing 10. Here, the housing 10 is used to provide a housing space for the battery cell 20, and the housing 10 may employ various structures. In some embodiments, the housing 10 may include a first cover 101 and a second cover 102, the first cover 101 and the second cover 102 overlapping each other, and together the first cover 101 and the second cover 102 define a housing space for housing the battery cell 20. The second lid 102 may be a hollow structure with one end open, and the first lid 101 may be a plate-like structure. The first lid 101 is placed over the open side of the second lid 102, thereby jointly defining the storage space. Both the first lid 101 and the second lid 102 may be hollow structures with one end open, and the open side of the first lid 101 is placed over the open side of the second lid 102. Of course, the housing 10 formed from the first lid 101 and the second lid 102 may have various shapes, such as a cylinder or a rectangular parallelepiped.

[0072] In the battery 100, there may be multiple battery cells 20, and the connections between the multiple battery cells 20 may be in series, in parallel, or in series-parallel. Series-parallel connection means that the multiple battery cells 20 may be connected in series or in parallel. The multiple battery cells 20 may be directly connected in series, in parallel, or in series-parallel, and the entire assembly of the multiple battery cells 20 may be housed in the housing 10. Of course, the battery 100 may first be configured as a battery module by connecting the multiple battery cells 20 in series, in parallel, or in series-parallel, and then the multiple battery modules may be connected in series, in parallel, or in series-parallel to form an integrated unit, which may then be housed in the housing 10. The battery 100 may further include other structures; for example, the battery 100 may further include busbar members for realizing electrical connections between the multiple battery cells 20.

[0073] Here, the battery cell 20 includes, but is not limited to, lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries. The battery cell may be cylindrical, flattened, rectangular, or have other shapes, and the embodiments of the disclosure are not limited to these either. Battery cells are generally classified into three types based on their packaging: cylindrical battery cells, rectangular battery cells, and pouch battery cells, and the embodiments of the disclosure are not limited to these either.

[0074] Referring to Figures 3 to 5, in the embodiment of this application, the battery cell 20 includes a main body 1, a first tab 2, a first insulating adhesive 3, and a second insulating adhesive 4, wherein the first tab 2 is formed at the axial end of the main body 1, the first insulating adhesive 3 is attached to the outer circumference of the main body 1, and the second insulating adhesive 4 is attached to the first tab 2, with a gap 5 between the first insulating adhesive 3 and the second insulating adhesive 4 in the axial direction of the main body 1.

[0075] As shown in Figures 3 to 5, the battery cell 20 includes an electrode assembly, which is a component in which an electrochemical reaction occurs. The electrode assembly includes a main body 1 and a first tab 2 and a second tab 7 extending from both axial ends of the main body 1, respectively. The main body 1 includes a positive electrode plate, a negative electrode plate, and a separator, and these three are wound together to form the main body 1.

[0076] In some embodiments of this application, 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 planarization process. The diameters of the first tab 2 and the second tab 7 are both approximately equal to the diameter of the main body 1.

[0077] In the embodiment of this application, by providing a gap 5 between the first insulating adhesive 3 and the second insulating adhesive 4 in the axial direction of the main body 1, the formation of a step difference between the first insulating adhesive 3 and the second insulating adhesive 4 can be reduced. Furthermore, this reduces stress concentration points when the battery cell expands, reduces the occurrence of problems such as electrode plate fracture, and is advantageous in improving the safety of the battery.

[0078] In some embodiments, the gap 5 extends along the circumferential direction of the main body 1. That is, the gap 5 is arranged in a ring, and the gap 5 is arranged around the circumferential direction of the main body 1. The advantage of this arrangement is that the first insulating adhesive 3 and the second insulating adhesive 4 do not completely overlap in the circumferential direction of the main body 1, and therefore there are no contact points between the first insulating adhesive 3 and the second insulating adhesive 4, no steps are generated, and the stress concentration points when the battery cell expands are greatly reduced, thus avoiding problems such as fracture of the electrode plates of the battery cell.

[0079] In some other embodiments, the gaps 5 are spaced apart along the circumferential direction of the main body 1. That is, the gaps 5 are intermittent rather than continuous in the circumferential direction of the main body 1. Compared to the configuration in which the first insulating adhesive 3 and the second insulating adhesive 4 completely overlap in the circumferential direction of the main body 1, providing spaced-apart gaps 5 can reduce the area of ​​stress concentration, thereby reducing the magnitude of concentrated stress and improving the problem of electrode plate fracture.

[0080] In some embodiments, the width of the gap 5 in the axial direction of the main body 1 is 1 mm to 2 mm.

[0081] Setting the width of the gap 5 to 1mm to 2mm, for example, 1mm, 1.3mm, 1.5mm, 1.8mm, or 2mm, not only reduces the stress concentration points when the battery cell expands and helps prevent problems such as fracture of the battery cell's electrode plates, but also allows the electrode assembly to have the largest possible insulating coverage area, thereby improving insulation performance.

[0082] In some embodiments, the width of the gap 5 in the axial direction of the main body 1 is constant or varies along the circumferential direction.

[0083] By setting the width of the gap 5 to be fixed along the circumferential direction, the width of the gap 5 can be kept uniform, improving the aesthetic appearance and overall integrity of the product. If the width of the gap 5 is set to vary along the circumferential direction, the difficulty of bonding the first insulating adhesive 3 and the second insulating adhesive 4 can be reduced, improving bonding efficiency.

[0084] In some embodiments, the puncture resistance of the second insulating adhesive 4 is greater than that of the first insulating adhesive 3.

[0085] Since the first tab 2 is generally manufactured using aluminum foil material and is more vulnerable to the main body 1, setting the puncture resistance of the second insulating adhesive 4 to be greater than that of the first insulating adhesive 3 allows for more effective protection of the first tab 2 and prevents it from being damaged.

[0086] Puncture resistance is an important property of insulating adhesives; that is, the ability of an insulating adhesive to resist punctures from external forces, and is also called "puncture resistance force" or "puncture resistance strength."

[0087] The puncture resistance of the insulating adhesive can be improved by adjusting its thickness, adding an intermediate layer, or increasing the thickness of the intermediate layer's material structure.

[0088] Puncture resistance refers to the maximum force required for a puncture needle of a specified specification or size to penetrate a test sample, or the maximum force value during the puncture process, and is generally expressed in units of Newtons (N).

[0089] The method for measuring puncture resistance may be as follows: Samples of the first insulating adhesive 3 and the second insulating adhesive 4 are fixed between two clamp rings (puncture-resistant fixtures), a puncture needle is held perpendicular to the sample at a constant speed and punctured at the center, and the value of the force received at the time of puncture is recorded.

[0090] Alternatively, the puncture resistance of the second insulating adhesive 4 may be measured using an electronic tensile testing machine. The specific measurement method may be as follows: Five samples of the second insulating adhesive 4 with a diameter of 100 mm are taken using a sampler, the samples are clamped into a puncture test fixture, and the fixture is fixed to the testing equipment. Test information such as the test speed and sample thickness is set, and the test is started by clicking the test start option. The electronic tensile testing machine automatically calculates and displays the final test result.

[0091] As shown in Figures 6 to 8, in some embodiments, the head and tail portions of the second insulating adhesive 4 have an overlapping portion 43 in the circumferential direction of the first tab 2.

[0092] By providing the overlapping portion 43, the head and tail of the second insulating adhesive 4 can be bonded together, forming a closed loop in the circumferential direction of the second insulating adhesive 4, providing 360° all-around insulating protection to the first tab 2, and further effectively improving the adhesive strength of the second insulating adhesive 4, allowing the second insulating adhesive 4 to be firmly bonded to the first tab 2. Moreover, generally, the second insulating adhesive 4 has a certain elasticity, and by providing the overlapping portion 43, the head and tail of the second insulating adhesive 4 are bonded together, preventing the second insulating adhesive 4 from retracting due to a decrease or loss of elasticity, thus preventing the loss of protection to the first tab 2.

[0093] In some embodiments, the length of the overlapping portion 43 in the circumferential direction of the first tab 2 is 5 mm to 10 mm.

[0094] By setting the circumferential length of the overlapping portion 43 to 5mm to 10mm, for example, 5mm, 6mm, 7mm, 8mm, 9mm, or 10mm, it is possible to effectively reinforce the stability of the second insulating adhesive 4 and to avoid stress concentration caused by an excessively long circumferential length of the overlapping portion.

[0095] Furthermore, compared to a configuration in which the first insulating adhesive 3 and the second insulating adhesive 4 have an overlapping portion, this overlapping portion 43 includes two layers of the second insulating adhesive 4, and the first insulating adhesive 3 is not superimposed on it. Therefore, even if the overlapping portion 43 exists, the possibility of it causing stress concentration is relatively small.

[0096] As shown in Figure 6, in some embodiments, the head edge line and tail edge line of the second insulating adhesive 4 are parallel in the circumferential direction of the first tab 2.

[0097] In the above embodiment, the head edge line and tail edge line of the second insulating adhesive 4 are parallel, which improves the overall aesthetic appearance of the second insulating adhesive 4, and the overlapping portion 43 formed after application may be a regular rectangle, making the overall appearance more beautiful and regular.

[0098] As shown in Figure 7, in some embodiments, the head edge line and / or tail edge line of the second insulating adhesive 4 are inclined with respect to the axis of the main body 1 in the circumferential direction of the first tab 2.

[0099] The above embodiment includes three embodiments: firstly, the head edge line of the second insulating adhesive 4 is inclined with respect to the axis of the main body 1; secondly, the tail edge line of the second insulating adhesive 4 is inclined with respect to the axis of the main body 1; and thirdly, both the head edge line and the tail edge line of the second insulating adhesive 4 are inclined with respect to the axis of the main body 1.

[0100] By setting the head edge line and / or tail edge line of the second insulating adhesive 4 to be inclined with respect to the axis of the main body 1, the middle line of the overlapping portion 43 can be inclined with respect to the axis of the main body 1. Furthermore, by increasing the length of the middle line of the overlapping portion 43, the ability to resist the contraction force of the overlapping portion 43 when the second insulating adhesive 4 retracts due to a decrease in elastic force can be increased, thereby improving the adhesive strength of the second insulating adhesive 4.

[0101] 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 misalignment of the tail portion of the second insulating adhesive 4 during application, and, assuming that this does not affect the insulating and protective function, it can effectively improve operational efficiency with a certain operational fault tolerance rate. Furthermore, this misalignment may be due to manufacturing tolerances of the second insulating adhesive 4, thereby allowing the second insulating adhesive 4 to have a certain manufacturing tolerance, reducing the requirements for manufacturing precision of the second insulating adhesive 4, and thus effectively controlling costs.

[0102] 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 being attached to the outer circumference of the first tab 2 along the circumferential direction, and the second adhesive portion 42 being attached to the end face of the first tab 2 away from the main body portion 1.

[0103] By installing the first adhesive portion 41 and the second adhesive portion 42, the first adhesive portion 41 can be attached to the outer circumference of the first tab 2 along the circumferential direction, and the second adhesive portion 42 can be attached to the end face of the first tab 2 away from the main body portion 1, thereby providing protection to the first tab 2 in more directions.

[0104] By installing the second adhesive portion 42, the end face of the first tab 2 is protected, preventing a portion of the structure of the end face of the first tab 2 from lifting above the height of the first adhesive portion 41 and coming into contact with the case, thereby preventing a short circuit.

[0105] In some embodiments, the battery cell 20 further includes a first current collector disc 6 mounted on the end face of the first tab 2 away from the main body 1, and a second adhesive portion 42 is attached to the first current collector disc 6.

[0106] An active material layer is formed on the first current collector disc 6, and the first current collector disc 6 collects the current generated by the active material layer, forms a relatively large current, and outputs it to the outside.

[0107] By attaching the second adhesive portion 42 to the first current collector disc 6, the second adhesive portion 42 can completely enclose the portion of the first tab 2 that is exposed from the first current collector disc 6, thereby providing more comprehensive protection for the first tab 2.

[0108] In some embodiments, the first current collector disc 6 is arranged coaxially with the main body 1, and the diameter of the first current collector disc 6 is smaller than the diameter of the main body 1.

[0109] When installing the first current collector disc 6, if there is a manufacturing error in the first current collector disc 6, in order to ensure that the first current collector disc 6 and the main body 1 can be coaxial, there is a possibility that after installation the first current collector disc 6 may protrude radially from the main body 1. In such a case, when the main body 1 and the first current collector disc 6 are placed into the case 9, the first current collector disc 6 may get caught in the case 9. Therefore, by setting the diameter of the first current collector disc 6 to be smaller than the diameter of the main body 1, the problem of the first current collector disc 6 getting caught in the case 9 when the main body 1 and the first current collector disc 6 are placed into the case 9 together can be effectively avoided.

[0110] The first tab 2 is located between the first current collector disc 6 and the main body 1. If the diameter of the first current collector disc 6 is smaller than the diameter of the main body 1, the portion of the end of the first tab 2 that is not covered by the first current collector disc 6 will be 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 potentially causing a short circuit by contacting other components. Furthermore, the exposed portion of the tab plate may warp and potentially cause a short circuit by contacting other components. Therefore, by attaching the second adhesive portion 42 to the first current collector disc 6, it is possible to effectively avoid the exposed portion of the first tab 2 that is not covered by the first current collector disc 6 bulging or warping, which could damage the tab structure or cause a short circuit.

[0111] In some embodiments, the first adhesive portion 41 and the second adhesive portion 42 are connected or integrally molded.

[0112] By connecting or integrally molding the first adhesive portion 41 and the second adhesive portion 42, the first adhesive portion 41 and the second adhesive portion 42 can be integrally connected, and when the second insulating adhesive 4 is applied, the mutual fitting of the first adhesive portion 41 and the second adhesive portion 42 can achieve a relatively good bonding effect. For example, the first adhesive portion 41 may first be attached to the outer circumference of the first tab 2, and then the second adhesive portion 42 may be attached to the end face of the first tab 2 using a flattening device.

[0113] In some embodiments, the viscosity of the second adhesive portion 42 is greater than the viscosity of the first adhesive portion 41.

[0114] When the second adhesive portion 42 is bent 90° inward from a position parallel to the axis of the main body portion 1 and attached to the end face of the first tab 2, wrinkles may form in the second adhesive portion 42, and air may get trapped in the wrinkles. The colloid in the second adhesive portion 42 will be dehydrated by the drying of the air, further weakening its adhesive properties. However, the first adhesive portion 41 is attached to the outer circumference of the first tab 2, and after attachment it is relatively flat, so the opportunity for air to get trapped is relatively small, and therefore the probability of weakening of adhesive properties due to dehydration is also relatively small. By setting the viscosity of the second adhesive portion 42 to be greater than that of the first adhesive portion 41, the second adhesive portion 42 will still have sufficient viscosity even after its adhesive properties have weakened due to dehydration, and will be able to hold it to the end face of the first tab 2.

[0115] Furthermore, since the second adhesive portion 42 is bent and flattened against the end face of the first tab 2, there is a risk that the elastic force of the second adhesive portion 42 will decrease over time, causing it to retract. By setting the viscosity of the second adhesive portion 42 to be greater than that of the first adhesive portion 41, the second adhesive portion 42 can be made more resistant to elastic force and reduce retraction, thereby preventing the loss of adhesive function of the second adhesive portion 42.

[0116] If the viscosity of the first adhesive portion 41 is lower than that of the second adhesive portion 42, and the application of the first adhesive portion 41 is non-standard and therefore does not meet the requirements, requiring extra effort, the first adhesive portion 41 can be peeled off relatively easily without adhering to the material of the main body portion 1, making reapplication easier.

[0117] 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.

[0118] Viscosity is physical data used to measure the magnitude of viscous forces. It reflects the strength of the interactions between fluid molecules during their motion. When a fluid flows, the relative motion of adjacent fluid layers creates frictional resistance between these two fluid layers, which is called viscous resistance.

[0119] Viscosity is affected by temperature; as the temperature rises, the distance between liquid molecules increases, further reducing the intermolecular attractive force and internal friction, which in turn reduces the viscosity of the colloidal substance.

[0120] The viscosity of insulating adhesives can be tested using the following three methods.

[0121] 1. Initial Adhesion: This tests the initial ability of the insulating adhesive to adhere to the substrate. The general method involves using a Chinese national standard steel ball and letting it roll naturally on an insulating adhesive surface inclined at a 45-degree angle. The size of the steel ball is gradually increased, and the larger the steel ball that adheres, the greater the initial adhesive strength.

[0122] 2. Viscosity retention: This refers to the ability of an insulating adhesive to maintain its viscosity after it has completely bonded an object. Test principle: A test plate to which the adhesive sample is attached is suspended vertically from a test frame, and a weight of a predetermined weight is suspended from the lower end. The peel resistance ability of the adhesive sample is characterized by the amount of displacement of the sample due to delamination after a certain period of time, or the time it takes for the sample to completely detach.

[0123] 3. The peel force of insulating adhesive, also known as adhesive strength, refers to the average force required to peel off the insulating adhesive at a constant speed after it has been applied to the substrate. The magnitude of the peel force affects the magnitude of the separation force between the object and the substrate; the greater the peel force, the more difficult it is for the object to separate from the surface of another object, while if the peel force is too small, it affects the adhesive performance of the insulating adhesive. Test method for peel force: A specific steel plate is bonded with insulating adhesive of a standard width, and then the insulating adhesive is peeled off the steel plate with a robotic arm. The stable force of the robotic arm reflects the magnitude of the peel force. Principle of peel strength of insulating adhesive: A sample is prepared by bonding two substrates with adhesive, and then the bonded sample is peeled off from the bonding opening at a predetermined rate, causing the two substrates to gradually separate along the longitudinal direction of the bonded surface.

[0124] In some embodiments, the ratio of the width of the first adhesive portion 41 in the axial direction of the main body portion 1 to the width of the second adhesive portion 42 in the direction perpendicular to the axis of the main body portion 1 is 1:1 to 2:1.

[0125] By setting the ratio of the width of the first adhesive portion 41 in the axial direction of the main body portion 1 to the width of the second adhesive portion 42 in the direction perpendicular to the axis of the main body portion 1 to 1:1 to 2:1, relatively comprehensive protection for the first tab 2 can be achieved, and a rational allocation to the outer circumference and end face of the first tab 2 can be realized while saving costs.

[0126] As shown in Figures 9 and 10, in some embodiments, a guide line 44 is provided on the second insulating adhesive 4, and the guide line 44 divides the second insulating adhesive 4 into a first adhesive portion 41 and a second adhesive portion 42.

[0127] By providing the guide line 44, when applying the second insulating adhesive 4, the ranges of the first adhesive portion 41 and the second adhesive portion 42 can be quickly identified by the guide line 44. The guide line 44 can effectively improve the application efficiency as an operational aid.

[0128] In some embodiments, the color of the indicator line 44 is different from the color of the second insulating adhesive 4.

[0129] By setting the color of the indicator line 44 to be different from the color of the second insulating adhesive 4, the indicator line 44 can be made more prominent, making it easier for the worker to recognize its location.

[0130] In some embodiments, the second adhesive portion 42 includes a substrate and a backing adhesive provided on the substrate, and the color of at least one of the substrate and the backing adhesive is set to a color that prevents light reflection when detecting the width of the second adhesive portion 42.

[0131] By setting at least one of the colors of the substrate and the backing adhesive to a color that prevents light reflection when detecting the width of the second adhesive portion 42, it is possible to prevent light reflection caused by the substrate and backing adhesive being too light in color when detecting the width of the second adhesive portion 42, thereby preventing an impact on the accuracy of the test.

[0132] For example, at least one of the base material and the backing adhesive may be set to a relatively dark color, such as black or brown.

[0133] In some embodiments, the battery cell 20 further includes a case 9 having a housing cavity, the main body 1 and the first tab 2 are installed within the housing cavity, and the material used for the case 9 is configured to prevent the case 9 from corroding by contacting the negative electrode of the battery cell 20.

[0134] In the main body 1, the anode material generally surrounds the cathode material when wound, so the anode material is generally located on the outer ring. Because there is a gap 5 between the first insulating adhesive 3 and the second insulating adhesive 4, this gap 5 creates an exposed portion of the anode material (i.e., the negative electrode portion) of the main body 1 or the first tab 2. If this exposed portion swells or warps, it may come into contact with the case 9 and corrode the case 9. Therefore, by setting the material of the case 9 to a material that prevents the case 9 from corroding by coming into contact with the negative electrode of the battery cell 20, it is possible to avoid corrosion of the exposed portion after it swells or warps and comes into contact with the case 9. For example, under certain conditions, contact between the battery negative electrode and the aluminum case can cause corrosion of the battery aluminum case and lead to battery leakage.

[0135] In some embodiments of this application, the case 9 may be manufactured using a material such as stainless steel or plastic. The steel case is either non-charged or negatively charged and does not corrode even when in contact with the negative electrode portion of the battery.

[0136] Case 9 is a component that provides a housing space for housing the electrode assembly, electrolyte, and other components inside. Case 9 includes a housing body having an opening and an end cap for sealing the opening. The housing body and the end cap may be separate components, and the housing body is provided with an opening, and the end cap is placed over the opening to form the internal environment of the battery cell 20. The end cap and the housing body may be integrated, but are not limited to this. Specifically, the end cap and the housing body may form a common connection surface before other components are placed in the case, and when it is necessary to package the inside of the housing body, the end cap may be placed over the housing body, and the housing body and end cap may be packaged together.

[0137] The housing body is an assembly for forming the internal environment of the battery cell 20 by fitting the end cap, and the end cap is a component that is placed over the opening of the housing body to isolate the internal environment of the battery cell 20 from the external environment. Not limited to, the shape of the end cap may be adapted to the shape of the housing body and fitted into the housing body. Selectively, the end cap may be manufactured from a material having a certain hardness and strength, so that the end cap is less likely to deform when pressed and expanded, the battery cell 20 can have higher structural strength, and safety performance can also be improved.

[0138] In some embodiments, the end cap may be further equipped with a pressure relief mechanism to release internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold.

[0139] Case 9 may have various shapes and sizes, such as a rectangular prism, cylindrical shape, or hexagonal prism shape. Specifically, the shape of Case 9 may be determined according to the specific shape and size of the electrode assembly.

[0140] This application further provides a battery 100, the battery 100 comprising a housing and the above-mentioned battery cell 20, the battery cell 20 being installed in the housing and used to provide electrical energy.

[0141] This application further provides a power-consuming device comprising the above-mentioned battery cell 20, the battery cell 20 being used to supply electrical energy to the power-consuming device, or comprising the above-mentioned battery 100, the battery 100 being used to supply electrical energy to the power-consuming device.

[0142] In the following section, the structure of one embodiment of the battery cell according to this application will be described by referring to Figures 3 through 10.

[0143] As shown in Figures 3 to 5, the battery cell 20 includes a main body 1, a first tab 2, a first insulating adhesive 3, a second insulating adhesive 4, a first current collector disc 6, a second tab 7, a second current collector disc 8, a case 9, an insulating member 11, a sealing ring 12, a pole 13, and a sealing pin 14.

[0144] The main body 1, the first tab 2, and the second tab 7 are all cylindrical in shape. The first tab 2 and the second tab 7 are formed on the two opposing axial ends of the main body 1 by a flattening process. The first current collector disc 6 and the second current collector disc 8 are both disc-shaped. Furthermore, the main body 1, the first tab 2, the second tab 7, the first current collector disc 6, and the second current collector disc 8 are arranged coaxially.

[0145] The main body 1, the first tab 2, the first current collector disc 6, the second tab 7, the second current collector disc 8, and the insulating member 11 are all installed in the internal cavity of the case 9.

[0146] The second current collector disc 8 is installed on the end face of the second tab 7, away from the main body 1. The insulating member 11 is installed between the first current collector disc 6 and the top end cap of the case 9. A mounting hole is provided in the top end cap of the case 9, the pole post 13 is attached to the through hole, and the seal ring 12 is installed between the pole post 13 and the end cap. A seal pin 14 is provided in the center of the pole post 13. An injection port 15 is provided in the first current collector disc 6.

[0147] The first insulating adhesive 3 is applied to the outer circumference of the main body 1. The second insulating adhesive 4 is applied to the outer circumference and end face of the first tab 2. Furthermore, the first current collector disc 6 is installed on the end face of the first tab 2 away from the main body 1, and one end of the second insulating adhesive 4 is applied to the first current collector disc 6.

[0148] 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 an annular shape along the circumferential direction of the main body 1.

[0149] In this embodiment, in the height direction, the top of the first insulating adhesive 3 is attached to the main body 1 at a height of 80% to 85%, and the bottom is attached to the main body 1 at a height of 15% to 20%. The distance between the top of the first insulating adhesive 3 and the top surface of the first tab 2 is approximately 10 mm.

[0150] As shown in Figure 6, the second insulating adhesive 4 includes a first adhesive portion 41 that is attached to the outer circumference of the first tab 2 and a second adhesive portion 42 that is attached to the end face of the first tab 2. In the circumferential direction, the head and tail portions of the second insulating adhesive 4 overlap to form an overlapping portion 43.

[0151] In the embodiment shown in Figure 6, the overlapping portion 43 is rectangular, and the boundary line of the overlapping portion 43 is perpendicular to the axis of the main body portion 1.

[0152] In the embodiment shown in Figure 7, the overlapping portion 43 is a parallelogram, and both the head edge line and tail edge line of the second insulating adhesive 4 are inclined with respect to the axis of the main body portion 1.

[0153] In the embodiment shown in Figure 8, the upper layer of the overlapping portion 43 is offset relative to the lower layer. The top edge of the upper layer extends over the top edge of the lower layer, and the bottom edge of the lower layer is positioned above the bottom edge of the lower layer.

[0154] As shown in Figure 9, both the head edge line and the tail edge line of the second insulating adhesive 4 are parallel to the axis of the main body 1.

[0155] As shown in Figure 10, both the head edge line and the tail edge line of the second insulating adhesive 4 are inclined with respect to the axis of the main body 1.

[0156] The second insulating adhesive 4 is further provided with an indicator line 44 to distinguish between the first adhesive portion 41 and the second adhesive portion 42, with one side of the indicator line 44 being the first adhesive portion 41 and the other side being the second adhesive portion 42.

[0157] In this embodiment, by providing a gap 5 between the first insulating adhesive 3 and the second insulating adhesive 4, the first insulating adhesive 3 and the second insulating adhesive 4 do not overlap on the side surface of the battery cell. This avoids the formation of a step due to a difference in thickness caused by the overlapping of the first insulating adhesive 3 and the second insulating adhesive 4, thereby preventing stress from forming here after the battery core electrode plates expand due to charging and discharging, and thus preventing the outer ring electrode plates of the battery core from fracturing.

[0158] While this application has been described with reference to preferred embodiments, various modifications are possible, and components thereof can be replaced with equivalents, without departing from the scope of this application. In particular, unless there is a structural conflict, each technical feature referred to in each embodiment may be combined in any manner. This application is not limited to the specific embodiments disclosed in the specification, but includes all technical ideas that fall within the scope of the claims. [Explanation of Symbols]

[0159] 1000 Vehicle, 100 Battery, 200 Controller, 300 Motor, 10 Housing, 101 First Cover, 102 Second Cover, 20 Battery Cell, 1 Main Body, 2 First Tab, 3 First Insulating Adhesive, 4 Second Insulating Adhesive, 41 First Adhesive Part, 42 Second Adhesive Part, 43 Overlapping Part, 44 Indicator Line, 5 Gap, 6 First Current Collector Disc, 7 Second Tab, 8 Second Current Collector Disc, 9 Case, 11 Insulating Material, 12 Seal Ring, 13 Electrode Column, 14 Seal Pin, 15 Liquid Injection Port.

Claims

1. A battery cell (20), Main body (1) and A first tab (2) is formed at the axial end of the main body portion (1), A first insulating adhesive (3) is attached to the outer circumference of the main body (1), The first tab (2) is attached to a second insulating adhesive (4), Here, the battery cell (20) has a gap (5) between the first insulating adhesive (3) and the second insulating adhesive (4) in the axial direction of the main body (1).

2. The gap (5) extends along the circumferential direction of the main body (1), as described in claim 1, for the battery cell (20).

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

4. The battery cell (20) according to any one of claims 1 to 3, wherein the width of the gap (5) in the axial direction of the main body (1) is constant or varies 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 that of the first insulating adhesive (3).

6. In the circumferential direction of the first tab (2), the head and tail portions of the second insulating adhesive (4) have an overlapping portion (43), as described in any one of claims 1 to 5, the battery cell (20).

7. The battery cell (20) according to claim 6, wherein the length of the overlapping portion (43) in the circumferential direction of the first tab (2) 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 tab (2), the head edge line and the tail edge line of the second insulating adhesive (4) are parallel.

10. In the circumferential direction of the first tab (2), the head edge line and / or tail edge line of the second insulating adhesive (4) are inclined with respect to the axis of the main body (1), as described in any one of claims 1 to 9, the battery cell (20).

11. The battery cell (20) according to any one of claims 1 to 10, wherein the second insulating adhesive (4) includes a first adhesive portion (41) and a second adhesive portion (42), the first adhesive portion (41) being attached to the outer circumference of the first tab (2) along the circumferential direction, and the second adhesive portion (42) being attached to the end face of the first tab (2) away from the main body portion (1).

12. The battery cell (20) according to claim 11, further comprising a first current collector disc (6) installed on the end face of the first tab (2) away from the main body portion (1), wherein the second adhesive portion (42) is attached to the first current collector disc (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 molded.

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 portion (1) to the width of the second adhesive portion (42) in the direction perpendicular to the axis of the main body portion (1) is 1:1 to 2:

1.

16. A battery cell (20) according to any one of claims 11 to 15, wherein a guide line (44) is provided on the second insulating adhesive (4), and the guide 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 adhesive (4).

18. The battery cell (20) according to any one of claims 11 to 17, wherein the second adhesive portion (42) includes a base material and a backing adhesive provided on the base material, and at least one of the base material and the backing adhesive is set to a color that prevents light reflection when detecting the width of the second adhesive portion (42).

19. A battery cell (20) according to any one of claims 11 to 18, further comprising a case (9) having a housing cavity, wherein the main body (1) and the first tab (2) are installed within the housing cavity, and the material used for the case (9) is configured to prevent the case (9) from corroding by contact with the negative electrode of the battery cell (20).

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 installed in the housing and the battery cell (20) is used to provide electrical energy.

21. A power-consuming device comprising a battery cell (20) according to any one of claims 1 to 19, wherein the battery cell (20) is used to supply electrical energy to the power-consuming device, or comprising a battery (100) according to claim 20, wherein the battery (100) is used to supply electrical energy to the power-consuming device.

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