Battery cell, electrode assembly, battery device, and electric device

Abstract

The application relates to a battery monomer, an electrode assembly, a battery device and a power utilization device. The battery monomer comprises a shell and an electrode assembly. The electrode assembly comprises a first electrode, the first electrode comprising a first current collector, a first active material layer, an insulating tape and an insulating primer. The first current collector comprises a first main body and a first tab. The first active material layer is arranged on at least one side surface of the first main body. In the direction of the first main body towards the first tab, the insulating tape is arranged on at least one side of the first active material layer, and at least part of the insulating tape covers the surface of the first main body. A gap is arranged between the insulating tape and the first active material layer. The insulating primer is coated on the surface of the first main body and has a thickness smaller than that of the insulating tape. The normal projection of the gap in the plane perpendicular to the thickness direction of the first current collector is located in the normal projection range of the insulating primer in the plane perpendicular to the thickness direction of the first current collector. The reliability of the battery monomer is high.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to battery cells, electrode assemblies, battery devices, and electrical devices. Background Technology

[0002] In the fabrication of secondary batteries, electrode components need to be cut. During this process, burrs are easily generated at the edges of the current collector after cutting. These burrs can easily puncture the separator, causing the positive and negative electrodes to overlap and resulting in a short circuit. Therefore, insulating tape is applied to the edges of the active material layer of the electrode components to block the burrs through this insulating structure. However, due to limitations in the application process, gaps may remain between the insulating tape and the active material layer. This gap can easily lead to foil leakage, thus affecting the reliability of the battery. Summary of the Invention

[0003] In view of the above problems, this application provides a battery cell, electrode assembly, battery device and power supply device, which can alleviate the problem of reduced reliability caused by foil leakage during battery use.

[0004] In a first aspect, this application provides a battery cell, including a housing and an electrode assembly. The electrode assembly includes a first electrode, wherein the first electrode includes a first current collector, a first active material layer, an insulating tape, and an insulating base coating. The first current collector includes a first body portion and a first tab, the first tab extending from at least one end of the first body portion; the first active material layer is disposed on at least one side surface of the first body portion; along the direction from the first body portion toward the first tab, the insulating tape is disposed on at least one side of the first active material layer, and at least a portion of the insulating tape covers the surface of the first body portion, with a gap between the insulating tape and the first active material layer; the insulating base coating is coated on the surface of the first body portion, and the thickness of the insulating base coating is less than the thickness of the insulating tape; the orthographic projection of the gap onto a plane perpendicular to the thickness direction of the first current collector lies within the orthographic projection range of the insulating base coating onto the plane perpendicular to the thickness direction of the first current collector.

[0005] The battery cell provided in this application embodiment has insulating tape on both sides of the first active material layer, which reduces the possibility of burrs on the edge of the current collector piercing the separator. Furthermore, an insulating undercoat is provided in the gap between the insulating tape and the first active material layer, and the orthographic projection of the gap onto the plane perpendicular to the thickness direction of the first current collector lies within the orthographic projection range of the insulating undercoat onto the plane perpendicular to the thickness direction of the first current collector. That is, the insulating undercoat can completely cover the gap in the plane perpendicular to the thickness direction of the first current collector. Therefore, the insulating undercoat can provide insulation protection for the first main body at the gap, reducing the possibility of foil leakage damage at the gap and effectively ensuring the reliability of the battery.

[0006] In some embodiments, the size d1 of the gap is smaller than the size d2 of the insulating undercoat along the direction from the first body portion toward the first tab. By setting the size d1 of the gap to be smaller than the size d2 of the insulating undercoat, the first body portion at the gap can be better protected by the insulating undercoat, further reducing the possibility of foil leakage short circuits occurring at the gap.

[0007] In some embodiments, the gap size d1 satisfies the condition: 0.2mm ≤ d1 ≤ 1mm. By setting the gap size d1 to a range greater than or equal to 0.2mm and less than or equal to 1mm, it is possible to achieve the effect of separating the first active material layer from the insulating tape, while also reducing foil leakage damage caused by excessively large gaps.

[0008] In some embodiments, the dimension d2 of the insulating undercoat, along the direction from the first main body to the first tab, satisfies the condition: 5mm ≤ d2 ≤ 10mm. By setting the dimension d2 of the insulating undercoat to be greater than or equal to 5mm and less than or equal to 10mm, better insulation protection is provided for the first main body at the gap, while the undercoat itself is not excessively long, thereby reducing the impact on the conductivity of the first main body.

[0009] In some embodiments, the orthographic projection of the insulating undercoat onto a plane perpendicular to the thickness direction of the first current collector at least partially coincides with the orthographic projection of the insulating tape onto the same plane. By ensuring that the orthographic projection of the insulating undercoat onto the same plane at least partially coincides with the orthographic projection of the insulating tape onto the same plane, the insulating undercoat can provide better insulation protection for the side of the gap closest to the insulating tape, reducing the possibility of foil leakage on that side.

[0010] In some embodiments, the orthographic projection of the insulating base coating onto a plane perpendicular to the thickness direction of the first current collector at least partially coincides with the orthographic projection of the first active material layer onto the same plane. By ensuring that the orthographic projection of the insulating base coating onto the plane perpendicular to the thickness direction of the first current collector at least partially coincides with the orthographic projection of the first active material layer onto the same plane, the insulating base coating can provide better insulation protection for the side of the gap closest to the first active material layer, reducing the possibility of foil leakage on that side.

[0011] In some embodiments, along the direction from the first main body towards the first tab, the size d3 of the overlapping area between the insulating base coating and the first active material layer satisfies the condition: 0 < d3 ≤ 5 mm. By setting the size d3 of the overlapping area between the insulating base coating and the first active material layer to be greater than 0 and less than or equal to 5 mm, the insulating base coating can provide better insulation protection for the side of the gap closest to the first active material layer, while reducing the influence of the insulating tape on the current conduction between the first main body and the first active material layer, thus effectively ensuring the current transmission between the first main body and the first active material layer.

[0012] In some embodiments, the thickness of the insulating undercoat is greater than or equal to 5 μm. By setting the thickness h3 of the insulating undercoat to greater than or equal to 5 μm, the thickness of the insulating undercoat is made more suitable, reducing the risk of foil leakage caused by cracking of the insulating undercoat when the first electrode is stretched.

[0013] In some embodiments, the first electrode further includes an adhesive undercoating layer disposed between the first active material layer and the first body portion. By disposing of the adhesive undercoating layer between the first active material layer and the first body portion, the bonding force between the first active material layer and the first body portion is increased through the adhesive undercoating layer, preventing separation between the two and improving the conductivity of the first electrode.

[0014] In some embodiments, the adhesive undercoating layer is disposed on the side of the insulating undercoating layer away from the first tab. By disposing the adhesive undercoating layer on the side of the insulating undercoating layer away from the first tab, the adhesive undercoating layer is separated by the insulating undercoating layer, thereby placing the adhesive undercoating layer on the side where the conductivity requirement of the first electrode is higher. This effectively enhances the bonding force between the first active material layer and the first main body, prevents their separation, and improves the conductivity of the first electrode.

[0015] In some embodiments, the thickness of the adhesive primer is the same as the thickness of the insulating primer. By setting the thickness of the adhesive primer and the insulating primer to be the same, it is beneficial to control the height and flatness of the first active material layer when the first active material layer is subsequently formed on the insulating primer and the adhesive primer.

[0016] In some embodiments, the thickness of the insulating tape is less than the thickness of the first active material layer. By setting the thickness h1 of the insulating tape to be less than the thickness h2 of the first active material layer, the edges of the electrode assembly are less likely to be excessively thick at the insulating tape during processing, thus making subsequent winding or stacking operations more convenient, facilitating subsequent housing operations, and reducing the risk of uneven current distribution or local overcharging and over-discharging caused by thick edges.

[0017] In some embodiments, the side of the first active material layer closest to the insulating tape is a straight edge. By making the side of the first active material layer closest to the insulating tape a straight edge, the cutting of the first active material layer becomes easier.

[0018] In some embodiments, the side of the first active material layer closest to the insulating tape is a wavy edge or a serrated edge. By setting the side of the first active material layer closest to the insulating tape to a wavy edge or a serrated edge, the cutting of the first active material layer becomes simpler and more convenient. It can be cut using different cutting blades, and it does not necessarily need to be cut into a straight edge, thus reducing the processing difficulty and precision requirements.

[0019] In some embodiments, the side of the first active material layer near the insulating tape is perpendicular to the surface of the first body portion near the first active material layer. By making the side of the first active material layer near the insulating tape perpendicular to the surface of the first body portion near the first active material layer, the width dimension d1 of the gap along the direction of the first body portion toward the first electrode tab and the width dimension d2 of the insulating tape along the direction of the first body portion toward the first electrode tab can be precisely controlled. This results in high dimensional accuracy of the entire first electrode structure.

[0020] In some embodiments, along the direction from the first body portion toward the first tab, the edge of the insulating tape on the side opposite to the first active material layer extends beyond the edge of the first body portion. By extending the edge of the insulating tape on the side opposite to the first active material layer beyond the edge of the first body portion, the insulating tape can protect the end of the first tab near the first body portion, thereby reinforcing the root of the first tab. This can, to some extent, prevent the first tab from bending and cracking, and also reduce the risk of weld slag generated during the subsequent welding process falling onto the first tab and puncturing the diaphragm.

[0021] In some embodiments, the first current collector includes a tab region and a non-tab region; in the tab region, the first main body is connected to the first tab, and the insulating tape overlaps with the first tab along the direction of the first main body toward the first tab; along the thickness direction of the first main body, the first main body includes a first surface and a second surface disposed opposite to each other; in the non-tab region, the insulating tape on the first surface extends from the first surface across the edge of the first main body and connects with the insulating tape on the second surface. Because the insulating tape overlaps with the first tab, the insulating tape can protect the end of the first tab near the first main body, thereby reinforcing the root of the first tab, preventing bending and cracking of the first tab to a certain extent, and also reducing the risk of weld slag generated during the subsequent welding process falling onto the first tab and puncturing the diaphragm. By extending the insulating tape from the first side across the edge of the first main body and connecting it with the insulating tape from the second side, the insulating tape can provide insulation protection for the edge of the first main body in the non-tab area, covering any burrs that may be generated at the edge of the first main body, thereby reducing the risk of positive and negative electrode short circuit caused by burrs piercing the diaphragm.

[0022] In some embodiments, the first active material layer is a dry electrode film free of solvent residue. When the first active material layer is a dry electrode film free of solvent residue, the drying steps can be reduced during the preparation of the first active material layer, energy consumption can be reduced, and the volatilization of some harmful gases during the drying process can also be reduced.

[0023] In some embodiments, the first electrode is a positive electrode. When the first electrode is a positive electrode, the first current collector is aluminum foil. Compared to the current collector for the negative electrode, which is generally made of copper foil, aluminum foil as the current collector for the positive electrode is more prone to burrs. These burrs can pierce the separator, causing the positive and negative electrodes to overlap, thus leading to a short circuit in the battery. Therefore, the first electrode provided in this application is a positive electrode. That is, the positive electrode has insulating tape on at least one side of the first active material layer along the direction from the first body portion toward the first tab. This allows the insulating tape to block the burrs generated at the edge of the first current collector after it is cut from aluminum foil, thereby effectively reducing the battery short circuit problem caused by burrs piercing the separator.

[0024] Secondly, this application provides an electrode assembly including a first electrode, which includes a first current collector, a first active material layer, an insulating tape, and an insulating base coating. The first current collector includes a first body portion and a first tab, the first tab extending longitudinally from at least one end of the first body portion; the first active material layer is disposed on at least one side surface of the first body portion; the insulating tape is disposed on at least one side of the first active material layer along the direction of the first body portion toward the first tab, and at least a portion of the insulating tape is coated on the surface of the first body portion, with a gap between the insulating tape and the first active material layer; the insulating base coating is coated on the surface of the first body portion, and the thickness of the insulating base coating is less than the thickness of the insulating tape; the orthographic projection of the gap onto a plane perpendicular to the thickness direction of the first current collector is located within the orthographic projection range of the insulating base coating onto the plane perpendicular to the thickness direction of the first current collector.

[0025] The electrode assembly provided in this embodiment reduces the possibility of burrs on the edge of the current collector piercing the separator by providing insulating tape on both sides of the first active material layer. Furthermore, an insulating undercoat is provided in the gap between the insulating tape and the first active material layer, and the orthographic projection of the gap onto the plane perpendicular to the thickness direction of the first current collector lies within the orthographic projection range of the insulating undercoat onto the plane perpendicular to the thickness direction of the first current collector. In other words, the insulating undercoat can completely cover the gap in the plane perpendicular to the thickness direction of the first current collector. Therefore, the insulating undercoat can provide insulation protection for the first main body at the gap, reducing the possibility of foil leakage damage at the gap and effectively ensuring the reliability of the battery.

[0026] Thirdly, this application provides a battery device comprising the battery cell described in any of the above embodiments. The battery device provided by the embodiments of this application can achieve at least one of the above-mentioned technical effects. When the battery device provided by the embodiments of this application is manufactured, the possibility of burrs on the edge of the first current collector piercing the separator is reduced. The possibility of foil leakage damage at the gap is also reduced, thereby effectively ensuring the reliability of the battery device.

[0027] Fourthly, this application provides an electrical device that includes the battery device described in the above embodiments, the battery device being used to provide electrical energy. By using the battery device disclosed in this application to form the power system of the electrical device, the reliability of the battery device can be effectively guaranteed.

[0028] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0029] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0030] Figure 1 This is a schematic diagram of the structure of an electrical device provided in some embodiments of this application.

[0031] Figure 2 for Figure 1 The diagram shows an exploded view of the battery device.

[0032] Figure 3 for Figure 2 The diagram shows the exploded structure of a single battery cell.

[0033] Figure 4 Provided for some embodiments of this application Figure 3 A schematic diagram of the first electrode in a single battery cell is shown.

[0034] Figure 5 Provided for some embodiments of this application Figure 3 A schematic diagram of the first electrode in a single battery cell is shown.

[0035] Figure 6 The first electrode in a battery cell provided in some embodiments of this application is Figure 4 The sectional view shown at point AA.

[0036] Figure 7 The first electrode in a battery cell provided in some embodiments of this application is Figure 5 The cross-sectional view shown at CC.

[0037] Figure 8 The first electrode in a battery cell provided in some embodiments of this application is Figure 4 The sectional view shown at point AA.

[0038] Figure 9 The first electrode in a battery cell provided in some embodiments of this application is Figure 4 The sectional view shown at BB.

[0039] Figure 10 The first electrode in a battery cell provided in some embodiments of this application is Figure 4 The sectional view shown at BB.

[0040] The reference numerals in the detailed embodiments are as follows:

[0041] 1000 - Vehicles;

[0042] 1100 - Battery assembly; 1110 - Housing; 1111 - First part; 1112 - Second part; 1120 - Individual battery cell; 1121 - End cap; 1122 - Housing; 1123 - Electrode assembly;

[0043] 1200-Controller;

[0044] 1300-motor;

[0045] 100 - First electrode; 100a - Gap;

[0046] 110 - First current collector; 111 - First main body; 112 - First electrode tab;

[0047] 120 - First active substance layer;

[0048] 130 - Insulating tape;

[0049] 140 - Insulating primer;

[0050] 150 - Adhesive primer coating. Detailed Implementation

[0051] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, 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 one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0053] 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 construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0054] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0055] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0056] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0057] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "size," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0058] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0059] Currently, judging from market trends, the application of power batteries is becoming increasingly widespread. Power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of power battery applications, market demand is also constantly increasing.

[0060] In the manufacturing process of power batteries, electrode components need to be cut. During this process, burrs are easily generated on the edges of the current collector after cutting. These burrs can easily puncture the separator, causing the positive and negative electrodes to overlap and resulting in a short circuit. Therefore, insulating tape is applied to the edges of the active material layer of the electrode component to block the burrs through this insulating structure. However, due to limitations in the application process, gaps may remain between the insulating tape and the active material layer. This gap can easily lead to foil leakage, thus affecting the reliability of the battery.

[0061] Based on the above considerations, in order to alleviate the problem of reduced reliability caused by foil leakage during battery use, this application provides a battery cell that provides an insulating structure at the gap, thereby protecting the current collector at the gap and reducing the possibility of foil leakage damage at the gap, effectively ensuring the reliability of the battery.

[0062] The power batteries ultimately manufactured from the battery cells disclosed in the embodiments of this application can be used, but are not limited to, in electrical devices such as vehicles, ships, or aircraft. Specifically, electrical devices can be, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Among them, electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0063] For ease of explanation, the following embodiments will be described using a vehicle 1000 as an example of an electrical device according to an embodiment of this application.

[0064] Please refer to Figure 1 , Figure 1 The diagram illustrates the structure of an electrical device according to some embodiments of this application. The electrical device can be a vehicle 1000, which can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle, or a range-extended electric vehicle, etc. A battery device 1100 is installed inside the vehicle 1000, and the battery device 1100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 1100 can be used to power the vehicle 1000; for example, the battery device 1100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 1200 and a motor 1300. The controller 1200 controls the battery device 1100 to supply power to the motor 1300, for example, to meet the power needs of the vehicle 1000 during startup, navigation, and driving.

[0065] In some embodiments of this application, the battery device 1100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0066] Please refer to Figure 2 , Figure 2 It shows Figure 1 The diagram shows an exploded view of the battery device 1100. The battery device 1100 includes a housing 1110 and battery cells 1120, with the battery cells 1120 housed within the housing 1110. The housing 1110 provides a space for the battery cells 1120, and the housing 1110 can have various structures. In some embodiments, the housing 1110 may include a first portion 1111 and a second portion 1112, which overlap each other, and together define a space for accommodating the battery cells 1120. The second part 1112 can be a hollow structure with one end open, and the first part 1111 can be a plate-like structure. The first part 1111 covers the open side of the second part 1112 so that the first part 1111 and the second part 1112 together define the accommodating space. Alternatively, the first part 1111 and the second part 1112 can both be hollow structures with one side open, and the open side of the first part 1111 covers the open side of the second part 1112. Of course, the box 1110 formed by the first part 1111 and the second part 1112 can be of various shapes, such as a cylinder, a cuboid, etc.

[0067] In the battery device 1100, there can be multiple battery cells 1120. These multiple battery cells 1120 can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that the multiple battery cells 1120 are connected in both series and parallel. The multiple battery cells 1120 can be directly connected in series, parallel, or in a mixed configuration, and then the entire assembly of the multiple battery cells 1120 is housed within the housing 1110. Alternatively, the battery device 1100 can also consist of multiple battery cells 1120 first connected in series, parallel, or in a mixed configuration to form a battery module, and then multiple battery modules are connected in series, parallel, or in a mixed configuration to form a whole, which is also housed within the housing 1110. The battery device 1100 may also include other structures; for example, the battery device 1100 may also include a busbar component for realizing the electrical connection between the multiple battery cells 1120.

[0068] Each battery cell 1120 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. The battery cell 1120 can be cylindrical, flat, cuboid, or other shapes.

[0069] Please see Figure 3 , Figure 3 It shows Figure 2 The diagram shows an exploded view of the battery cell 1120. The battery cell 1120 refers to the smallest unit that makes up a battery. Figure 3 The battery cell 1120 includes an end cap 1121, a housing 1122, a cell assembly, and other functional components, and the electrode assembly 1123 includes a first electrode 100.

[0070] End cap 1121 refers to a component that covers the opening of housing 1122 to isolate the internal environment of battery cell 1120 from the external environment. Not limited to this, the shape of end cap 1121 can be adapted to the shape of housing 1122 to fit it. Optionally, end cap 1121 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that end cap 1121 is not easily deformed under pressure and impact, allowing battery cell 1120 to have higher structural strength and improved safety performance. Functional components such as electrode terminals can be provided on end cap 1121. Electrode terminals can be used for electrical connection with the cell assembly to output or input electrical energy to battery cell 1120. In some embodiments, end cap 1121 may also be provided with a pressure relief mechanism for releasing internal pressure when the internal pressure or temperature of battery cell 1120 reaches a threshold. The end cap 1121 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose any special limitations on this. In some embodiments, an insulating structure may also be provided on the inner side of the end cap 1121. The insulating structure can be used to isolate the electrical connection components inside the housing 1122 from the end cap 1121 to reduce the risk of short circuit. For example, the insulating structure can be plastic, rubber, etc.

[0071] The housing 1122 is a component used to cooperate with the end cap 1121 to form the internal environment of the battery cell 1120. This internal environment can accommodate the cell assembly, electrolyte, and other components. The housing 1122 and the end cap 1121 can be independent components. An opening can be provided on the housing 1122, and the end cap 1121 can be used to close the opening to form the internal environment of the battery cell 1120. Alternatively, the end cap 1121 and the housing 1122 can be integrated. Specifically, the end cap 1121 and the housing 1122 can form a common connecting surface before other components are inserted into the housing. When it is necessary to encapsulate the interior of the housing 1122, the end cap 1121 closes the housing 1122. The housing 1122 can have various shapes and sizes, such as cuboid, cylindrical, or hexagonal prism. Specifically, the shape of the housing 1122 can be determined according to the specific shape and size of the battery cell assembly. The shell 1122 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. This application embodiment does not impose any special restrictions on this.

[0072] A cell assembly is the component within a single battery cell 1120 where an electrochemical reaction occurs. The casing 1122 may contain one or more cell assemblies. A cell assembly primarily consists of a positive electrode, a negative electrode, and a separator placed between the positive and negative electrodes, thermally bonded to form a composite strip, and then stacked together. The portions of the positive and negative electrodes containing active material constitute the main body of the cell assembly, while the portions without active material each constitute a tab. The positive and negative tabs may be located together at one end of the main body or at opposite ends. During charging and discharging, the positive and negative active materials react with the electrolyte, and the tabs connect to the electrode terminals to form a current loop. The first electrode 100 can be a positive electrode.

[0073] Please see Figure 4 and Figure 5 and combined Figures 6-8 , Figure 4 Some embodiments of this application are shown. Figure 3 A schematic diagram of the first electrode 100 in the battery cell 1120 shown. Figure 5 Some embodiments of this application are shown. Figure 3 A schematic diagram of the first electrode 100 in the battery cell 1120 shown. Figure 6 The first electrode 100 in a battery cell 1120 provided in some embodiments of this application is shown. Figure 4 The sectional view shown at point AA. Figure 7 The first electrode 100 in a battery cell 1120 provided in some embodiments of this application is shown. Figure 5 The cross-sectional view shown at CC. Figure 8 The first electrode 100 in a battery cell 1120 provided in some embodiments of this application is shown. Figure 4 The sectional view shown at point AA.

[0074] The first electrode 100 of the battery cell 1120 provided in some embodiments of this application includes a first current collector 110, a first active material layer 120, an insulating tape 130, and an insulating base layer 140. The first current collector 110 includes a first main body 111 and a first tab 112, the first tab 112 extending from at least one end of the first main body 111; a first active material layer 120 is disposed on at least one side surface of the first main body 111; an insulating tape 130 is disposed along the first main body 111 toward the first tab 112, the insulating tape 130 is disposed on at least one side of the first active material layer 120, and at least a portion of the insulating tape 130 covers the surface of the first main body 111, a gap 100a is provided between the insulating tape 130 and the first active material layer 120; an insulating base coating 140 is coated on the surface of the first main body 111, and the thickness of the insulating base coating 140 is less than the thickness of the insulating tape 130; the orthographic projection of the gap 100a onto the plane perpendicular to the thickness direction of the first current collector 110 is located within the orthographic projection range of the insulating base coating 140 onto the plane perpendicular to the thickness direction of the first current collector 110.

[0075] The first electrode 100 can be a positive electrode sheet. Correspondingly, the first current collector 110 is an aluminum foil, and the first active material layer 120 includes a ternary material, lithium manganese oxide, or lithium iron phosphate. Multiple first tabs 112 can be present. After the first electrode sheet is wound and formed, multiple first tabs 112 are stacked together and welded to the current collector. The first tabs 112 can be formed by cutting from the first current collector. The first tabs 112 can extend from one end of the first main body 111 along its longitudinal direction. For example, the longitudinal direction of the first main body 111 is... Figures 4-8 The direction of xx' in the middle.

[0076] The first active material layer 120 can be a dry electrode film free of solvent residues, which can be formed into an electrode film using a dry process from a dry particulate mixture comprising multiple carbon particles, elemental lithium metal, and one or more electrode components. Exemplarily, a dry process or dry mixture refers to a process and mixture that contains no or substantially no liquid or solvent. For example, an electrode film formed from a dry particulate mixture using a dry process can be substantially free of residues from such liquids and / or solvents.

[0077] The insulating tape 130 can be made of polyimide tape (PI tape), polyester tape (PET tape), or polytetrafluoroethylene tape (PTFE tape), etc. The insulating tape 130 is easy to apply, which makes the connection between the insulating tape 130 and the first current collector 110 easier.

[0078] By providing a gap 100a between the insulating tape 130 and the first active material layer 120, the insulating tape 130 can be easily pasted during processing, so that the insulating tape 130 does not need to be tightly attached to the first active material layer 120.

[0079] The insulating base coating 140 can be made of AT11 material, which is a ceramic slurry, thereby achieving better insulation performance. By providing the insulating base coating 140 on the surface of the first main body 111, and the thickness of the insulating base coating 140 being less than the thickness of the insulating tape 130, the orthographic projection of the insulating base coating 140 perpendicular to the thickness direction of the first current collector 110 covers the orthographic projection of the gap 100a perpendicular to the thickness direction of the first current collector 110. This allows the insulating base coating 140 to insulate the first main body 111 at the gap 100a, reducing the possibility of foil leakage short circuits at the gap 100a.

[0080] The battery cell 1120 provided in this embodiment of the application has insulating tape 130 on both sides of the first active material layer 120, which reduces the possibility of burrs on the edge of the first current collector 110 piercing the separator. Furthermore, since an insulating undercoating layer 140 is provided at the gap 100a between the insulating tape 130 and the first active material layer 120, and the orthographic projection of the gap 100a onto the plane perpendicular to the thickness direction of the first current collector 110 lies within the orthographic projection range of the insulating undercoating layer 140 onto the plane perpendicular to the thickness direction of the first current collector 110, the insulating undercoating layer 140 can completely cover the interior of the gap 100a. Therefore, the insulating undercoating layer 140 can provide insulation protection for the first main body 111 at the gap 100a, reducing the possibility of foil leakage damage at the gap 100a, thereby effectively ensuring the reliability of the battery device 1100.

[0081] It should be noted that the battery cell 1120 provided in this application embodiment can be as follows: Figure 4 The bilateral outlet ears shown can also be as follows: Figure 5 The single-sided outlet tab shown can be adapted to specific usage requirements, and no special limitations are imposed on it.

[0082] Please see Figure 6 and Figure 7In some embodiments, the orthographic projection of the insulating tape 130 onto the plane perpendicular to the thickness direction of the first current collector 110 coincides with the orthographic projection of the first tab 112 onto the plane perpendicular to the thickness direction of the first current collector 110. By coinciding the orthographic projection of the insulating tape 130 onto the plane perpendicular to the thickness direction of the first current collector 110 with the orthographic projection of the first tab 112 onto the plane perpendicular to the thickness direction of the first current collector 110, the insulating tape 130 can protect the end of the first tab 112 near the first body portion 111, thereby reinforcing the root of the first tab 112. This can prevent the first tab 112 from bending and cracking to a certain extent, and also reduce the risk of weld slag generated during the subsequent welding process of the first tab 112 falling onto the first tab 112 and puncturing the diaphragm.

[0083] Please see Figure 8 In some embodiments, the orthographic projection of the insulating tape 130 onto the plane perpendicular to the thickness direction of the first current collector 110 does not coincide with the orthographic projection of the first tab 112 onto the plane perpendicular to the thickness direction of the first current collector 110. That is, the side of the insulating tape 130 near the first tab 112 is flush with the root of the side of the first tab 112 near the first main body 111. This ensures that the insulating tape 130 provides insulation protection to the surface of the first main body 111, reducing material waste of the insulating tape 130.

[0084] The structure of the 1120 battery cell is described in detail below. Please refer to [link / reference]. Figures 9-10 , Figure 9 The first electrode 100 in a battery cell 1120 provided in some embodiments of this application is shown. Figure 4 The sectional view shown at BB. Figure 10 The first electrode 100 in a battery cell 1120 provided in some embodiments of this application is shown. Figure 4 The sectional view shown at BB.

[0085] Please see Figure 9 and Figure 10 In some embodiments, the dimension d1 of the gap 100a is smaller than the dimension d2 of the insulating undercoat 140 along the direction from the first body portion 111 toward the first tab 112. Exemplarily, the direction from the first body portion 111 toward the first tab 112 is along... Figures 9-10 The direction of xx' in the middle.

[0086] The dimension d1 of the gap 100a is the distance between the surface of the first active material layer 120 near the insulating tape 130 and the surface of the insulating tape 130 near the first active material layer 120. The dimension d2 of the insulating base layer 140 is its distance along... Figures 9-10The distance between one side surface and the other side surface in the xx' direction.

[0087] By setting the size d1 of the gap 100a to be smaller than the size d2 of the insulating base coating 140, the first main body portion 111 at the gap 100a can be better protected by the insulating base coating 140, further reducing the possibility of foil leakage short circuit from the gap 100a.

[0088] Please see Figure 9 and Figure 10 In some embodiments, the dimension d1 of the gap 100a satisfies the condition: 0.2mm ≤ d1 ≤ 1mm. Exemplarily, the direction of the first main body 111 toward the first electrode tab 112 is... Figure 9 and Figure 10 The direction of xx' in the middle.

[0089] By setting the size d1 of the gap 100a to a range of greater than or equal to 0.2 mm and less than or equal to 1 mm, the foil leakage damage caused by an excessively large gap 100a can be reduced after the first active material layer 120 and the insulating tape 130 are separated.

[0090] In some embodiments, the size d1 of the gap 100a is 0.2 mm. This ensures that the first active material layer 120 and the insulating tape 130 are separated by a very small gap 100a, preventing them from contacting each other, while also reducing foil leakage damage caused by an excessively large gap 100a.

[0091] In some embodiments, the size d1 of the gap 100a is 1 mm, which makes the size d1 of the gap 100a larger, which facilitates the application of the insulating tape 130 and reduces the accuracy requirements of the coating position.

[0092] In some embodiments, the dimension d1 of the gap 100a is 0.25mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 0.95mm, etc., which can be adaptively adjusted according to the requirements of machining accuracy.

[0093] Please see Figure 9 and Figure 10 In some embodiments, the dimension d2 of the insulating undercoat 140 along the direction from the first body portion 111 toward the first tab 112 satisfies the condition: 5mm≤d2≤10mm.

[0094] By setting the size d2 of the insulating base coating 140 to be greater than or equal to 5 mm and less than or equal to 10 mm, the first main body portion 111 at the gap 100a is provided with better insulation protection without being too long, thereby reducing the impact on the conductivity of the first main body portion 111 itself.

[0095] In some embodiments, the dimension d2 of the insulating undercoat 140 is 5 mm. This minimizes the impact on the conductivity of the first body portion 111 when insulating the first body portion 111 at the gap 100a.

[0096] In some embodiments, the dimension d2 of the insulating undercoat 140 is 10 mm. This provides better insulation protection for the first main body portion 111 at the gap 100a, reducing the possibility of foil leakage at the gap 100a.

[0097] In some embodiments, the size d2 of the insulating undercoat 140 can be 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm, etc.

[0098] Please see Figures 6-10 In some embodiments, the orthographic projection of the insulating base coating 140 onto a plane perpendicular to the thickness direction of the first current collector 110 at least partially coincides with the orthographic projection of the insulating tape 130 onto a plane perpendicular to the thickness direction of the first current collector 110.

[0099] The orthographic projection of the insulating base coating 140 onto the plane perpendicular to the thickness direction of the first current collector 110 at least partially overlaps with the orthographic projection of the insulating tape 130 onto the plane perpendicular to the thickness direction of the first current collector 110, meaning that the side of the insulating base coating 140 closest to the first tab 112 can be located between the insulating tape 130 and the first main body 111.

[0100] By at least partially overlapping the orthographic projection of the insulating base coating 140 onto the plane perpendicular to the thickness direction of the first current collector 110 with the orthographic projection of the insulating tape 130 onto the plane perpendicular to the thickness direction of the first current collector 110, the insulating base coating 140 can provide better insulation protection for the side of the gap 100a near the insulating tape 130, thereby reducing the possibility of foil leakage on the side of the gap 100a near the insulating tape 130.

[0101] Please see Figures 6-10 In some embodiments, the orthographic projection of the insulating base layer 140 onto a plane perpendicular to the thickness direction of the first current collector 110 at least partially coincides with the orthographic projection of the first active material layer 120 onto a plane perpendicular to the thickness direction of the first current collector 110.

[0102] The orthographic projection of the insulating base coating 140 onto the plane perpendicular to the thickness direction of the first current collector 110 at least partially overlaps with the orthographic projection of the first active material layer 120 onto the plane perpendicular to the thickness direction of the first current collector 110, meaning that the side of the insulating base coating 140 closest to the first active material layer 120 can be located between the first active material layer 120 and the first main body portion 111.

[0103] By at least partially overlapping the orthographic projection of the insulating base coating 140 onto the plane perpendicular to the thickness direction of the first current collector 110 with the orthographic projection of the first active material layer 120 onto the plane perpendicular to the thickness direction of the first current collector 110, the insulating base coating 140 can provide better insulation protection for the side of the gap 100a near the first active material layer 120, thereby reducing the possibility of foil leakage on the side of the gap 100a near the first active material layer 120.

[0104] Please see Figure 9 and Figure 10 In some embodiments, along the direction from the first body portion 111 toward the first tab 112, the size d3 of the overlapping area between the insulating base coating 140 and the first active material layer 120 satisfies the condition: 0 < d3 ≤ 5 mm.

[0105] The overlapping area between the insulating base coating 140 and the first active material layer 120 can provide better insulation protection for the side of gap 100a closest to the first active material layer 120. The size of the overlapping area between the insulating base coating 140 and the first active material layer 120 is the distance between the side edge of the insulating base coating 140 closest to the first active material layer 120 and the side edge of gap 100a closest to the first active material layer 120.

[0106] By setting the size d3 of the overlapping area between the insulating base coating 140 and the first active material layer 120 to be greater than 0 and less than or equal to 5 mm, the insulating base coating 140 can provide better insulation protection for the side of the gap 100a near the first active material layer 120, while reducing the influence of the insulating tape 130 on the current conduction between the first main body 111 and the first active material layer 120, so that the current transmission between the first main body 111 and the first active material layer 120 is effectively guaranteed.

[0107] In some embodiments, the size d3 of the overlapping area between the insulating base layer 140 and the first active material layer 120 can be 5 mm. By setting the size d3 of the overlapping area between the insulating base layer 140 and the first active material layer 120 to 5 mm, the insulating base layer 140 can provide better insulation protection for the side of the gap 100a near the first active material layer 120.

[0108] In some embodiments, the size d3 of the overlapping area between the insulating base layer 140 and the first active material layer 120 can be 4.5 mm, 4 mm, 3.5 mm, 3 mm, 2.5 mm, 2 mm, 1.5 mm, 1 mm or 0.5 mm.

[0109] Please see Figures 6-10 In some embodiments, the thickness h1 of the insulating undercoat 140 is greater than or equal to 5 μm.

[0110] The thickness of the insulating undercoat 140 is its length along... Figures 6-10 The dimension in the zz' direction. By setting the thickness h3 of the insulating base coating 140 to be greater than or equal to 5 μm, the thickness of the insulating base coating 140 is made more suitable, reducing the risk of foil leakage caused by cracking of the insulating base coating 140 after the first electrode 100 is stretched.

[0111] In some embodiments, the thickness h3 of the insulating undercoat 140 is 5 μm. By setting the thickness h3 of the insulating undercoat 140 to 5 μm, it is possible to ensure insulation protection for the first main body portion 111 below the gap 100a, while also reducing the risk of foil leakage caused by cracking of the insulating undercoat 140 after the first electrode 100 is stretched.

[0112] Please see Figure 10 In some embodiments, the first electrode 100 further includes an adhesive undercoating 150 disposed between the first active material layer 120 and the first body portion 111.

[0113] The adhesive primer 150 is made of a conductive material and an adhesive. In some embodiments, it includes a modified polyolefin resin and a conductive material. The modified polyolefin resin is a copolymer of maleic anhydride, polyolefin, and petroleum resin.

[0114] The polyolefin is selected from one or more of the following: polyethylene, polypropylene, ethylene-vinyl acetate copolymer, styrene-butadiene copolymer, styrene-ethylene-butene-styrene block copolymer, styrene-isoprene-styrene block copolymer, and amorphous polyalphaolefin resin. Optionally, the polyolefin is selected from one or more of the following: polyethylene, polypropylene, ethylene-vinyl acetate copolymer, and styrene-ethylene-butene-styrene block copolymer. By selecting the polyolefin, the adhesion between the first active material layer 120 and the first body portion 111 can be further improved.

[0115] The conductive material is a carbon material, selected from one or more of the following: carbon black, graphene, carbon nanotubes, graphite, and mesophase carbon microspheres. By selecting a conductive material, the volume resistivity of the battery electrode can be further reduced. The conductive material can be in the form of granules, fibers, sheets, etc.

[0116] By providing an adhesive undercoating 150 between the first active material layer 120 and the first main body portion 111, the bonding force between the first active material layer 120 and the first main body portion 111 is increased through the adhesive undercoating 150, preventing them from separating and improving the conductivity of the first electrode 100.

[0117] Please see Figure 10 In some embodiments, the adhesive undercoat 150 is disposed on the side of the insulating undercoat 140 away from the first tab 112. By disposing the adhesive undercoat 150 on the side of the insulating undercoat 140 away from the first tab 112, the adhesive undercoat 150 is separated by the insulating undercoat 140, thereby placing the adhesive undercoat 150 on the side where the conductivity requirement of the first electrode 100 is higher. This effectively enhances the bonding force between the first active material layer 120 and the first main body 111, prevents them from separating, and improves the conductivity of the first electrode 100.

[0118] Please see Figure 10 In some embodiments, the thickness of the adhesive undercoat 150 is the same as the thickness of the insulating undercoat 140.

[0119] The insulating primer 140 and the adhesive primer 150 can be prepared sequentially in the same process, so that the thickness of the adhesive primer 150 is the same as the thickness of the insulating primer 140.

[0120] By setting the thickness of the adhesive primer 150 to be the same as the thickness of the insulating primer 140, it is easier to control the height and flatness of the first active material layer 120 when the first active material layer 120 is formed on the subsequent insulating primer 140 and adhesive primer 150.

[0121] Please see Figures 6-10 In some embodiments, the thickness h2 of the insulating tape 130 is less than the thickness h3 of the first active material layer 120.

[0122] During the processing and preparation, when the insulating tape 130 is being cut, the cutting thickness of the insulating tape 130 can be controlled, so that the thickness h1 of the insulating tape 130 finally bonded to the first current collector 110 can be less than the thickness h2 of the first active material layer 120.

[0123] By setting the thickness h1 of the insulating tape 130 to be less than the thickness h2 of the first active material layer 120, the edge of the electrode assembly 1123 is less likely to be too thick at the insulating tape 130 during processing, thus making subsequent winding or stacking operations more convenient and subsequent housing operations more convenient. It can also reduce the risk of uneven current distribution or local overcharging and over-discharging caused by the thick edge.

[0124] Please see Figures 6-10 In some embodiments, the side edge of the first active material layer 120 near the insulating tape 130 is a straight edge.

[0125] When the first active material layer 120 is prepared by dry coating, the edge of the first active material layer 120 is directly cut so that the side of the first active material layer 120 near the insulating tape 130 is a straight edge.

[0126] By setting the side edge of the first active material layer 120 close to the insulating tape 130 as a straight edge, the cutting of the first active material layer 120 becomes more convenient.

[0127] In some embodiments, the side edge of the first active material layer 120 near the insulating tape 130 is a wavy edge or a serrated edge.

[0128] When the first active material layer 120 is prepared by dry coating, the side of the first active material layer 120 near the insulating tape 130 can be shaped into a wavy edge or a serrated edge by the shape of the cutting blade or by controlling the cutting trajectory.

[0129] By setting the side edge of the first active material layer 120 near the insulating tape 130 as a wavy edge or a serrated edge, the cutting of the first active material layer 120 becomes simpler and more convenient. It can be cut with different cutting blades and does not necessarily need to be cut into a straight edge. The processing difficulty and precision requirements are also lower.

[0130] Please see Figures 6-10 In some embodiments, the side of the first active material layer 120 near the insulating tape 130 is perpendicular to the surface of the first body portion 111 near the first active material layer 120.

[0131] When the first active material layer 120 is prepared by dry coating, the edge of the first active material layer 120 is directly cut, and the cutting trajectory is controlled so that the surface of the first active material layer 120 near the insulating tape 130 is perpendicular to the surface of the first main body 111 near the first active material layer 120.

[0132] By making the side of the first active material layer 120 near the insulating tape 130 perpendicular to the surface of the first main body 111 near the first active material layer 120, the width dimension d1 of the gap 100a along the direction of the first main body 111 toward the first electrode tab 112 and the width dimension d2 of the insulating tape 130 along the direction of the first main body 111 toward the first electrode tab 112 can be precisely controlled. This results in high dimensional accuracy of the entire first electrode 100.

[0133] Please see Figure 6 and Figure 7 In some embodiments, along the direction from the first body portion 111 toward the first tab 112, the edge of the insulating tape 130 on the side opposite to the first active material layer 120 extends beyond the edge of the first body portion 111. That is, the orthographic projection of the insulating tape 130 onto the plane perpendicular to the thickness direction of the first current collector 110 partially coincides with the orthographic projection of the first tab 112 onto the plane perpendicular to the thickness direction of the first current collector 110.

[0134] By extending the edge of the insulating tape 130 away from the first active material layer 120 beyond the edge of the first main body 111, the insulating tape 130 can protect the end of the first tab 112 near the first main body 111, thereby strengthening the root of the first tab 112. This can prevent the first tab 112 from bending and cracking to a certain extent, and also reduce the risk of welding slag generated during the welding process of the first tab 112 falling on the first tab 112 and puncturing the diaphragm.

[0135] Please see Figure 4 and Figure 5 In some embodiments, the first current collector 110 includes a tab region and a non-tab region. Exemplarily, the first current collector 110 extends along its width direction, i.e. Figure 4 and Figure 5 The yy' direction includes the polar region and the non-polar regions located on either side of the polar region. See also... Figure 6 and Figure 7 In the tab area, the first main body 111 is connected to the first tab 112, and the insulating tape 130 overlaps with the first tab 112 along the direction from the first main body 111 toward the first tab 112. Because the insulating tape 130 overlaps with the first tab 112, the insulating tape 130 can protect the end of the first tab 112 near the first main body 111, reinforcing the root of the first tab 112. This can, to some extent, prevent the first tab 112 from bending and cracking, and also reduce the risk of welding slag generated during the welding process falling onto the first tab 112 and puncturing the diaphragm.

[0136] Along the thickness direction of the first main body portion 111, the first main body portion 111 includes a first surface and a second surface disposed opposite to each other; please refer to Figure 9 and Figure 10 In the non-tab region, the insulating tape 130 on the first side crosses the edge of the first main body 111 from the first side and connects with the insulating tape 130 on the second side.

[0137] When the first active material layer 120 is prepared by dry coating, the first active material layer 120 and the first tab 112 can be cut first, and then the insulating tape 130 can be pasted, which makes the processing more convenient. At the same time, in the tab area, the insulating tape can be glued to the root of the first tab 112; while in the non-tab area, the insulating tape 130 is wrapped around the edge of the first main body 111.

[0138] By extending the insulating tape 130 from the first side across the edge of the first main body 111 and connecting it with the insulating tape 130 on the second side, the insulating tape 130 can provide insulation protection for the edge of the first main body 111 in the non-tab area, covering any burrs that may be generated at the edge of the first main body 111, thereby reducing the risk of short circuit between positive and negative electrodes caused by burrs piercing the diaphragm.

[0139] In some embodiments, the first active material layer 120 is a dry electrode film free of solvent residues. When the first active material layer 120 is a dry electrode film free of solvent residues, it can be formed into an electrode film using a dry process from a dry particulate mixture comprising multiple carbon particles, elemental lithium metal, and one or more electrode components. Exemplarily, a dry process or dry mixture refers to a process and mixture that contains no or substantially no liquid or solvent. For example, an electrode film formed from a dry particulate mixture using a dry process may be substantially free of residues from such liquids and / or solvents.

[0140] When the first active material layer 120 is a dry electrode film without solvent residue, the drying steps are reduced during the preparation of the first active material layer 120, energy consumption is reduced, and the volatilization of some harmful gases during the drying process is also reduced.

[0141] In some embodiments, the first electrode 100 is a positive electrode. When the first electrode 100 is a positive electrode, the first current collector 110 is an aluminum foil. Compared to the current collector for the negative electrode, which is generally made of copper foil, aluminum foil as the current collector for the positive electrode is more prone to burrs. These burrs can pierce the separator, causing the positive and negative electrodes to overlap, thus leading to a short circuit in the battery. Therefore, the first electrode 100 provided in this application is a positive electrode. That is, the positive electrode has an insulating tape 130 on at least one side of the first active material layer 120 along the direction from the first main body 111 toward the first tab 112. This allows the burrs generated at the edge of the first current collector 110, which is made of aluminum foil, to be blocked by the insulating tape 130 after cutting, thereby effectively reducing the battery short circuit problem caused by burrs piercing the separator.

[0142] Please see Figures 6-8 The electrode assembly 1123 provided in some embodiments of this application includes a housing 1122 and an electrode assembly 1123. The electrode assembly 1123 includes a first electrode 100, wherein the first electrode 100 is a positive electrode. The first electrode 100 includes a first current collector 110, a first active material layer 120, an insulating tape 130, and an insulating base layer 140. The first current collector 110 includes a first main body 111 and a first tab 112, the first tab 112 extending from at least one end of the first main body 111; a first active material layer 120 is disposed on at least one side surface of the first main body 111; an insulating tape 130 is disposed along the first main body 111 toward the first tab 112, the insulating tape 130 is disposed on at least one side of the first active material layer 120, and at least a portion of the insulating tape 130 covers the surface of the first main body 111, a gap 100a is provided between the insulating tape 130 and the first active material layer 120; an insulating base coating 140 is coated on the surface of the first main body 111, and the thickness of the insulating base coating 140 is less than the thickness of the insulating tape 130; the thickness h2 of the insulating tape 130 is less than the thickness h3 of the first active material layer 120.

[0143] The orthographic projection of gap 100a onto the plane perpendicular to the thickness direction of the first current collector 110 lies within the orthographic projection range of the insulating base coating 140 onto the plane perpendicular to the thickness direction of the first current collector 110. Along the direction from the first main body 111 towards the first tab 112, the dimension d1 of gap 100a is smaller than the dimension d2 of insulating base coating 140. The dimension d1 of gap 100a satisfies the condition: 0.2mm ≤ d1 ≤ 1mm. Along the direction from the first main body 111 towards the first tab 112, the dimension d2 of insulating base coating 140 satisfies the condition: 5mm ≤ d2 ≤ 10mm.

[0144] The orthographic projection of the insulating base coating 140 onto the plane perpendicular to the thickness direction of the first current collector 110 at least partially coincides with the orthographic projection of the insulating tape 130 onto the plane perpendicular to the thickness direction of the first current collector 110. The orthographic projection of the insulating base coating 140 onto the plane perpendicular to the thickness direction of the first current collector 110 at least partially coincides with the orthographic projection of the first active material layer 120 onto the plane perpendicular to the thickness direction of the first current collector 110. Along the direction from the first main body 111 toward the first tab 112, the dimension d3 of the overlapping area between the insulating base coating 140 and the first active material layer 120 satisfies the condition: 0 < d3 ≤ 5 mm. The thickness h1 of the insulating base coating 140 is greater than or equal to 5 μm.

[0145] The first current collector 110 includes a tab region and a non-tab region. In the tab region, the first main body 111 is connected to the first tab 112, and the insulating tape 130 overlaps with the first tab 112 along the direction from the first main body 111 toward the first tab 112. Along the thickness direction of the first main body 111, the first main body 111 includes a first surface and a second surface disposed opposite to each other; in the non-tab region, the insulating tape 130 of the first surface extends from the first surface across the edge of the first main body 111 and connects with the insulating tape 130 of the second surface.

[0146] The battery cell 1120 provided in this application embodiment has insulating tape 130 on both sides of the first active material layer 120, which reduces the possibility of burrs on the edge of the current collector piercing the separator. Furthermore, since an insulating base coating 140 is provided at the gap 100a between the insulating tape 130 and the first active material layer 120, and the orthographic projection of the gap 100a onto the plane perpendicular to the thickness direction of the first current collector 110 is located within the orthographic projection range of the insulating base coating 140 onto the plane perpendicular to the thickness direction of the first current collector 110, that is, within the plane perpendicular to the thickness direction of the first current collector 110, the insulating base coating 140 can completely cover the interior of the gap 100a. Therefore, the first main body 111 at the gap 100a can be insulated and protected by the insulating base coating 140. By setting the size d1 of the gap 100a to be smaller than the size d2 of the insulating base coating 140, the first main body 111 at the gap 100a can be better protected by the insulating base coating 140, further reducing the possibility of foil leakage short circuit from the gap 100a. By setting the dimension d1 of the gap 100a to a range greater than or equal to 0.2 mm and less than or equal to 1 mm, the effect of separating the first active material layer 120 and the insulating tape 130 is achieved, while also reducing foil leakage damage caused by an excessively large gap 100a. By setting the dimension d2 of the insulating undercoat 140 to greater than or equal to 5 mm and less than or equal to 10 mm, better insulation protection is provided for the first main body portion 111 at the gap 100a, without making the portion itself too long, thus reducing the impact on the conductivity of the first main body portion 111.

[0147] By setting the thickness h1 of the insulating tape 130 to be less than the thickness h2 of the first active material layer 120, the edge of the electrode assembly 1123 is less likely to be too thick at the insulating tape 130 during processing, thus making subsequent winding or stacking operations more convenient and subsequent housing operations more convenient. It can also reduce the risk of uneven current distribution or local overcharging and over-discharging caused by the thick edge.

[0148] By at least partially coinciding the orthographic projection of the insulating base coating 140 onto the plane perpendicular to the thickness direction of the first current collector 110 with the orthographic projection of the insulating tape 130 onto the plane perpendicular to the thickness direction of the first current collector 110, the insulating base coating 140 can provide better insulation protection for the side of the gap 100a near the insulating tape 130, reducing the possibility of foil leakage on the side of the gap 100a near the insulating tape 130. Furthermore, by at least partially coinciding the orthographic projection of the insulating base coating 140 onto the plane perpendicular to the thickness direction of the first current collector 110 with the orthographic projection of the first active material layer 120 onto the plane perpendicular to the thickness direction of the first current collector 110, the insulating base coating 140 can provide better insulation protection for the side of the gap 100a near the first active material layer 120, reducing the possibility of foil leakage on the side of the gap 100a near the first active material layer 120.

[0149] By setting the dimension d3 of the overlapping area between the insulating base coating 140 and the first active material layer 120 to be greater than 0 and less than or equal to 5 mm, the insulating base coating 140 can provide better insulation protection for the side of the gap 100a near the first active material layer 120, while reducing the influence of the insulating tape 130 on the current conduction between the first main body 111 and the first active material layer 120, thus effectively ensuring the current transmission between the first main body 111 and the first active material layer 120. Furthermore, setting the thickness h3 of the insulating base coating 140 to be greater than or equal to 5 μm makes the thickness of the insulating base coating 140 more suitable, reducing the risk of foil leakage caused by cracking of the insulating base coating 140 after the first electrode 100 is stretched.

[0150] Since the insulating tape 130 overlaps with the first tab 112, the insulating tape 130 can protect the end of the first tab 112 near the first main body 111, thus reinforcing the root of the first tab 112. This can prevent the first tab 112 from bending and cracking to a certain extent, and also reduce the risk of weld slag generated during the welding process falling onto the first tab 112 and puncturing the diaphragm. Furthermore, in the non-tab area, the insulating tape 130 on the first side extends beyond the edge of the first main body 111 and connects with the insulating tape 130 on the second side. This allows the insulating tape 130 to provide insulation protection for the edge of the first main body 111 in the non-tab area, covering any burrs that may be generated at the edge of the first main body 111, thereby reducing the risk of short circuits caused by burrs puncturing the diaphragm.

[0151] Please see Figure 9The electrode assembly 1123 provided in some embodiments of this application includes a housing 1122 and an electrode assembly 1123. The electrode assembly 1123 includes a first electrode 100, wherein the first electrode 100 is a positive electrode. The first electrode 100 includes a first current collector 110, a first active material layer 120, an insulating tape 130, an insulating base layer 140, and an adhesive base layer 150. The first current collector 110 includes a first main body 111 and a first tab 112, the first tab 112 extending from at least one end of the first main body 111; a first active material layer 120 is disposed on at least one side surface of the first main body 111; an insulating tape 130 is disposed along the first main body 111 toward the first tab 112, the insulating tape 130 is disposed on at least one side of the first active material layer 120, and at least a portion of the insulating tape 130 covers the surface of the first main body 111, a gap 100a is provided between the insulating tape 130 and the first active material layer 120; an insulating base coating 140 is coated on the surface of the first main body 111, and the thickness of the insulating base coating 140 is less than the thickness of the insulating tape 130; the thickness h2 of the insulating tape 130 is less than the thickness h3 of the first active material layer 120.

[0152] The orthographic projection of gap 100a onto the plane perpendicular to the thickness direction of the first current collector 110 lies within the orthographic projection range of the insulating base coating 140 onto the plane perpendicular to the thickness direction of the first current collector 110. Along the direction from the first main body 111 towards the first tab 112, the dimension d1 of gap 100a is smaller than the dimension d2 of insulating base coating 140. The dimension d1 of gap 100a satisfies the condition: 0.2mm ≤ d1 ≤ 1mm. Along the direction from the first main body 111 towards the first tab 112, the dimension d2 of insulating base coating 140 satisfies the condition: 5mm ≤ d2 ≤ 10mm. The orthographic projection of insulating base coating 140 onto the plane perpendicular to the thickness direction of the first current collector 110 at least partially coincides with the orthographic projection of insulating tape 130 onto the plane perpendicular to the thickness direction of the first current collector 110. The orthographic projection of the insulating base coating 140 onto the plane perpendicular to the thickness direction of the first current collector 110 at least partially coincides with the orthographic projection of the first active material layer 120 onto the plane perpendicular to the thickness direction of the first current collector 110. Along the direction from the first main body 111 towards the first tab 112, the dimension d3 of the overlapping area between the insulating base coating 140 and the first active material layer 120 satisfies the condition: 0 < d3 ≤ 5 mm. The thickness h1 of the insulating base coating 140 is greater than or equal to 5 μm.

[0153] The first current collector 110 includes a tab region and a non-tab region. In the tab region, the first main body 111 is connected to the first tab 112, and the insulating tape 130 overlaps with the first tab 112 along the direction from the first main body 111 toward the first tab 112. Along the thickness direction of the first main body 111, the first main body 111 includes a first surface and a second surface disposed opposite to each other; in the non-tab region, the insulating tape 130 of the first surface extends from the first surface across the edge of the first main body 111 and connects with the insulating tape 130 of the second surface.

[0154] Meanwhile, the adhesive base coating 150 is disposed between the first active material layer 120 and the first main body 111. The adhesive base coating 150 is disposed on the side of the insulating base coating 140 away from the first tab 112. And the thickness of the adhesive base coating 150 is the same as the thickness of the insulating base coating 140.

[0155] The battery cell 1120 provided in this application embodiment has insulating tape 130 on both sides of the first active material layer 120, which reduces the possibility of burrs on the edge of the current collector piercing the separator. Furthermore, since an insulating base coating 140 is provided at the gap 100a between the insulating tape 130 and the first active material layer 120, and the orthographic projection of the gap 100a onto the plane perpendicular to the thickness direction of the first current collector 110 is located within the orthographic projection range of the insulating base coating 140 onto the plane perpendicular to the thickness direction of the first current collector 110, that is, within the plane perpendicular to the thickness direction of the first current collector 110, the insulating base coating 140 can completely cover the interior of the gap 100a. Therefore, the first main body 111 at the gap 100a can be insulated and protected by the insulating base coating 140. By setting the size d1 of the gap 100a to be smaller than the size d2 of the insulating base coating 140, the first main body 111 at the gap 100a can be better protected by the insulating base coating 140, further reducing the possibility of foil leakage short circuit from the gap 100a. By setting the dimension d1 of the gap 100a to a range greater than or equal to 0.2 mm and less than or equal to 1 mm, the effect of separating the first active material layer 120 and the insulating tape 130 is achieved, while also reducing foil leakage damage caused by an excessively large gap 100a. By setting the dimension d2 of the insulating undercoat 140 to greater than or equal to 5 mm and less than or equal to 10 mm, better insulation protection is provided for the first main body portion 111 at the gap 100a, without making the portion itself too long, thus reducing the impact on the conductivity of the first main body portion 111.

[0156] By setting the thickness h1 of the insulating tape 130 to be less than the thickness h2 of the first active material layer 120, the edge of the electrode assembly 1123 is less likely to be too thick at the insulating tape 130 during processing, thus making subsequent winding or stacking operations more convenient and subsequent housing operations more convenient. It can also reduce the risk of uneven current distribution or local overcharging and over-discharging caused by the thick edge.

[0157] By at least partially coinciding the orthographic projection of the insulating base coating 140 onto the plane perpendicular to the thickness direction of the first current collector 110 with the orthographic projection of the insulating tape 130 onto the plane perpendicular to the thickness direction of the first current collector 110, the insulating base coating 140 can provide better insulation protection for the side of the gap 100a near the insulating tape 130, reducing the possibility of foil leakage on the side of the gap 100a near the insulating tape 130. Furthermore, by at least partially coinciding the orthographic projection of the insulating base coating 140 onto the plane perpendicular to the thickness direction of the first current collector 110 with the orthographic projection of the first active material layer 120 onto the plane perpendicular to the thickness direction of the first current collector 110, the insulating base coating 140 can provide better insulation protection for the side of the gap 100a near the first active material layer 120, reducing the possibility of foil leakage on the side of the gap 100a near the first active material layer 120.

[0158] By setting the dimension d3 of the overlapping area between the insulating base coating 140 and the first active material layer 120 to be greater than 0 and less than or equal to 5 mm, the insulating base coating 140 can provide better insulation protection for the side of the gap 100a near the first active material layer 120, while reducing the influence of the insulating tape 130 on the current conduction between the first main body 111 and the first active material layer 120, thus effectively ensuring the current transmission between the first main body 111 and the first active material layer 120. Furthermore, setting the thickness h3 of the insulating base coating 140 to be greater than or equal to 5 μm makes the thickness of the insulating base coating 140 more suitable, reducing the risk of foil leakage caused by cracking of the insulating base coating 140 after the first electrode 100 is stretched.

[0159] By providing an adhesive undercoat 150 between the first active material layer 120 and the first main body portion 111, the bonding force between the first active material layer 120 and the first main body portion 111 is increased through the adhesive undercoat 150, preventing separation between the two and improving the conductivity of the first electrode 100. Simultaneously, setting the thickness of the adhesive undercoat 150 to be the same as the thickness of the insulating undercoat 140 facilitates control over the height and flatness of the first active material layer 120 when it is subsequently formed on the insulating undercoat 140 and the adhesive undercoat 150.

[0160] Since the insulating tape 130 overlaps with the first tab 112, the insulating tape 130 can protect the end of the first tab 112 near the first main body 111, thus reinforcing the root of the first tab 112. This can prevent the first tab 112 from bending and cracking to a certain extent, and also reduce the risk of weld slag generated during the welding process falling onto the first tab 112 and puncturing the diaphragm. Furthermore, in the non-tab area, the insulating tape 130 on the first side extends beyond the edge of the first main body 111 and connects with the insulating tape 130 on the second side. This allows the insulating tape 130 to provide insulation protection for the edge of the first main body 111 in the non-tab area, covering any burrs that may be generated at the edge of the first main body 111, thereby reducing the risk of short circuits caused by burrs puncturing the diaphragm.

[0161] Please see Figures 5-10 This application also provides an electrode assembly 1123, which includes a first electrode 100, the first electrode 100 including a first current collector 110, a first active material layer 120, an insulating tape 130 and an insulating base layer 140. The first current collector 110 includes a first main body 111 and a first tab 112, the first tab 112 extending longitudinally from at least one end of the first main body 111; a first active material layer 120 is disposed on at least one side surface of the first main body 111; an insulating tape 130 is disposed on at least one side of the first active material layer 120 along the direction of the first main body 111 toward the first tab 112, and the insulating tape 130 is at least partially coated on the surface of the first main body 111, a gap 100a is provided between the insulating tape 130 and the first active material layer 120; an insulating base coating 140 is coated on the surface of the first main body 111, and the thickness of the insulating base coating 140 is less than the thickness of the insulating tape 130; the orthographic projection of the gap 100a onto the plane perpendicular to the thickness direction of the first current collector 110 is located within the orthographic projection range of the insulating base coating 140 onto the plane perpendicular to the thickness direction of the first current collector 110.

[0162] The electrode assembly 1123 provided in this embodiment of the application has insulating tape 130 on both sides of the first active material layer 120, which reduces the possibility of burrs on the edge of the current collector piercing the separator. Furthermore, since an insulating undercoating layer 140 is provided at the gap 100a between the insulating tape 130 and the first active material layer 120, and the orthographic projection of the gap 100a onto the plane perpendicular to the thickness direction of the first current collector 110 lies within the orthographic projection range of the insulating undercoating layer 140 onto the plane perpendicular to the thickness direction of the first current collector 110, the insulating undercoating layer 140 can completely cover the interior of the gap 100a. Therefore, the insulating undercoating layer 140 can provide insulation protection for the first main body 111 at the gap 100a, reducing the possibility of foil leakage damage at the gap 100a, thereby effectively ensuring the reliability of the battery.

[0163] Please see Figure 2 This application also provides a battery device 1100, which includes the battery cell 1120 described in any of the above embodiments. The battery device 1100 provided in this application embodiment can achieve at least one of the above-mentioned technical effects. When the battery device 1100 provided in this application embodiment is manufactured, the possibility of burrs on the edge of the first current collector 110 piercing the separator is reduced. It also reduces the possibility of foil leakage damage at the gap 100a, thereby effectively ensuring the reliability of the battery device 1100.

[0164] Please see Figure 1 This application also provides an electrical device including the battery device 1100 described in the above embodiments, the battery device 1100 being used to provide electrical energy. The battery device 1100 disclosed in this application can be used, but is not limited to, in electrical devices such as vehicles 1000, ships, or aircraft. Exemplarily, the electrical device can be, but is not limited to, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc. By using the battery device 1100 disclosed in this application to form the power system of the electrical device, the reliability of the battery device 1100 can be effectively guaranteed.

[0165] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized by, The battery includes a case (1122) and an electrode assembly (1123) including a first electrode (100), wherein the first electrode (100) includes: a first current collector (110) including a first body portion (111) and a first tab (112) extending from at least one end of the first body portion (111); a first active material layer (120) disposed on at least one side surface of the first body portion (111); an insulating tape (130) disposed on at least one side of the first active material layer (120) in a direction of the first body portion (111) toward the first tab (112), at least a portion of the insulating tape (130) covering a surface of the first body portion (111), and a gap (100a) being provided between the insulating tape (130) and the first active material layer (120); the thickness of the insulating tape (130) being less than the thickness of the first active material layer (120); an insulating primer layer (140) coated on the surface of the first body portion (111), the thickness of the insulating primer layer (140) being less than the thickness of the insulating tape (130); a projection of the insulating primer layer (140) on a plane perpendicular to the thickness direction of the first current collector (110) at least partially overlapping a projection of the insulating tape (130) on the plane perpendicular to the thickness direction of the first current collector (110), and a side of the insulating primer layer (140) close to the first tab (112) being located between the insulating tape (130) and the first body portion (111); a projection of the gap (100a) on a plane perpendicular to the thickness direction of the first current collector (110) being located within a projection range of the insulating primer layer (140) on the plane perpendicular to the thickness direction of the first current collector (110).

2. The battery cell of claim 1, wherein, In the direction of the first body portion (111) toward the first tab (112), the size d1 of the gap (100a) is less than the size d2 of the insulating primer layer (140).

3. The battery cell of claim 2, wherein, The size d1 of the gap (100a) satisfies the condition: 0.2 mm ≤ d1 ≤ 1 mm.

4. The battery cell of claim 2, wherein, In the direction of the first body portion (111) toward the first tab (112), the size d2 of the insulating primer layer (140) satisfies the condition: 5 mm ≤ d2 ≤ 10 mm.

5. The battery cell of claim 1, wherein, The projection of the insulating primer layer (140) on the plane perpendicular to the thickness direction of the first current collector (110) at least partially overlaps the projection of the first active material layer (120) on the plane perpendicular to the thickness direction of the first current collector (110).

6. The battery cell of claim 5, wherein, In the direction of the first body portion (111) toward the first tab (112), the size d3 of the overlapping region of the insulating primer layer (140) and the first active material layer (120) satisfies the condition: 0 < d3 ≤ 5 mm.

7. The battery cell of claim 1, wherein, The thickness of the insulating primer layer (140) is greater than or equal to 5 μm.

8. The battery cell of any one of claims 1-7, wherein, The first electrode (100) further comprises a bonding primer layer (150) disposed between the first active material layer (120) and the first body portion (111).

9. The battery cell of claim 8, wherein, The bonding primer layer (150) is disposed on a side of the insulating primer layer (140) away from the first tab (112).

10. The battery cell of claim 8, wherein, The bonding primer layer (150) has the same thickness as the insulating primer layer (140).

11. The battery cell of any one of claims 1-7, 9-10, wherein, The side edge of the first active material layer (120) on a side close to the insulating tape (130) is a straight edge.

12. The battery cell of any one of claims 1-7, 9-10, wherein, The side edge of the first active material layer (120) on a side close to the insulating tape (130) is a wavy edge or a jagged edge.

13. The battery cell of any one of claims 1-7, 9-10, wherein, The side of the first active material layer (120) on a side close to the insulating tape (130) is perpendicular to the surface of the first body portion (111) on a side close to the first active material layer (120).

14. The battery cell of any one of claims 1-7, 9-10, wherein, In a direction of the first body portion (111) toward the first tab (112), the edge of the insulating tape (130) on a side away from the first active material layer (120) exceeds the edge of the first body portion (111).

15. The battery cell of claim 14, wherein, The first current collector (110) comprises a tab area and a non-tab area; In the tab area, the first body portion (111) is connected with the first tab (112), and in a direction of the first body portion (111) toward the first tab (112), the insulating tape (130) has an overlapping area with the first tab (112); In a thickness direction of the first body portion (111), the first body portion (111) comprises oppositely disposed first and second surfaces; in the non-tab area, the insulating tape (130) on the first surface crosses the edge of the first body portion (111) from the first surface and is connected with the insulating tape (130) on the second surface.

16. The battery cell of any one of claims 1-7, 9-10, 15, wherein, The first active material layer (120) is a dry electrode film without solvent residues.

17. The battery cell of any one of claims 1-7, 9-10, 15, wherein, The first electrode (100) is a positive electrode.

18. An electrode assembly, characterized by, The electrode assembly comprises a first electrode (100), and the first electrode (100) comprises: a first current collector (110) comprising a first body portion (111) and a first tab (112), the first tab (112) extending from at least one end of the first body portion (111) in a longitudinal direction; a first active material layer (120) disposed on at least one side surface of the first body portion (111); an insulating tape (130) disposed on at least one side of the first active material layer (120) in a direction of the first body portion (111) toward the first tab (112), and at least part of the insulating tape (130) is coated on the surface of the first body portion (111), a gap (100a) is provided between the insulating tape (130) and the first active material layer (120); the thickness of the insulating tape (130) is less than the thickness of the first active material layer (120); An insulating undercoat layer (140) is coated on a surface of the first body portion (111), and the thickness of the insulating undercoat layer (140) is smaller than the thickness of the insulating tape (130); a projection of the insulating undercoat layer (140) on a plane perpendicular to the thickness direction of the first current collector (110) at least partially overlaps a projection of the insulating tape (130) on the plane, and a side of the insulating undercoat layer (140) close to the first tab (112) is located between the insulating tape (130) and the first body portion (111); A projection of the gap (100a) on a plane perpendicular to the thickness direction of the first current collector (110) is located within a range of a projection of the insulating undercoat layer (140) on the plane.

19. A battery device characterized by comprising: Comprising: A plurality of battery cells (1120) as claimed in any one of claims 1-17.

20. An electrical device, comprising: Comprising: A battery device as claimed in claim 19, the battery device being used to provide electrical energy.

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