Electrode assembly, battery cell, battery, and electrical device

Abstract

Embodiments of the present application are applicable in the technical field of power batteries and provide an electrode assembly (100), a battery cell (200), a battery (300), and an electrical device (400). The electrode assembly comprises: an electrode sheet (10), comprising an electrode sheet body (11) and an electrode tab area (12); and separators (20), which are arranged on two opposite sides of the electrode sheet in the thickness direction of the electrode sheet, the separators comprising covering parts (21) covering the electrode sheet body and exceeding parts (22) connected to the covering parts, the exceeding parts covering a portion of the electrode tab area; the exceeding parts at the two opposite sides of the electrode sheet are at least partially interconnected and form a joint part (31), or the exceeding parts at the two opposite sides of the electrode sheet are at least partially connected to the electrode tab area and form a joint part. The electrode assembly provided by the present application enables the two separators to surround the electrode sheet in the width direction of the electrode sheet, upon which, even if a separator is folded over, the electrode sheet will not be externally exposed, so as to reduce the occurrence of a separator folding over causing adjacent electrode sheets to come into contact, and improving battery yield.

Description

Electrode assembly, battery cell, battery and electrical device

[0001] This application claims priority to the Chinese patent application filed with the Patent Office of China on September 28, 2023, with application number 202311279494.7, and invention name “Electrode assembly, battery cell, battery and electrical device”, all contents of which are incorporated by reference into this application. Technical Field

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

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

[0004] The battery cell is a crucial component of the battery structure, and the winding process is a crucial step. During the winding process, the separator often folds, causing abnormalities such as contact between adjacent electrodes. This can easily lead to short circuits, causing cell failure and affecting the yield rate.

[0005] Summary of the Invention

[0006] In view of the above problems, the present application provides an electrode assembly, a battery cell, a battery and an electrical device, which can reduce the occurrence of battery cell failure caused by diaphragm folding.

[0007] In a first aspect, some embodiments of the present application provide an electrode assembly, comprising:

[0008] Pole piece, including pole piece body and pole ear area;

[0009] A diaphragm is provided on opposite sides of the electrode piece along the thickness direction of the electrode piece, and the diaphragm includes a covering portion covering the electrode piece body and a protruding portion connected to the covering portion, wherein the protruding portion covers a portion of the electrode tab area;

[0010] The protruding portions on opposite sides of the pole piece are at least partially connected to each other to form a joint portion, or the protruding portions on opposite sides of the pole piece are at least partially connected to the pole tab area to form a joint portion.

[0011] In the technical solution of this embodiment, diaphragms are provided on both sides of the pole piece, and the diaphragms include a covering portion covering the pole piece body and a protruding portion extending outside the pole piece. The protruding portions on both sides of the pole piece are then combined to form a combining portion, or the two protruding portions are connected to the pole ear area to form a combining portion, so that the two diaphragms can wrap the pole piece in the width direction of the pole piece or be connected to the pole ear. At this time, even if the diaphragm is folded, the pole piece will not be exposed to the outside world, so as to reduce the situation where the two adjacent pole pieces are in contact due to the folding of the diaphragm, thereby improving the yield of the battery.

[0012] In some embodiments, in the width direction of the pole piece, both sides of the covering portion are provided with protruding portions, and both opposite sides of the pole piece are provided with joining portions.

[0013] In the technical solution of this embodiment, protruding portions are provided on both sides of the covering portion along the width direction of the electrode to form joint portions on both sides of the electrode along the width direction. At this time, the two diaphragms form a pocket-like structure to accommodate the electrode. The electrode is wrapped between the two diaphragms and is not easily exposed to the outside world. At this time, even if the diaphragm is folded, the electrode is not likely to contact another adjacent electrode to cause a short circuit, thereby further improving the yield of the battery.

[0014] In some embodiments, in the width direction of the pole piece, the size of the joining portion is smaller than or equal to the size of the protruding portion.

[0015] Because the joining portion is formed by connecting two protruding portions, and the main function of the joining portion is to connect the two diaphragms so that the two diaphragms can better wrap the electrode, in the technical solution of this embodiment, the size of the joining portion in the width direction of the electrode is smaller than or equal to the size of the protruding portion, so as to reduce the situation where the two protruding portions cover part of the electrode when they are combined, thereby reducing the negative impact of the protruding portions on the electrode during the process of forming the joining portion, and further improving the yield of the battery.

[0016] In some embodiments, in the width direction of the pole piece, the size of the protruding portion ranges from 2 mm to 20 mm.

[0017] The technical solution of this embodiment provides some specific dimensional parameters of the protruding parts. In the width direction of the pole piece, the dimensional range of the protruding parts is such that the two protruding parts have sufficient length to extend beyond the pole piece and to combine to form a bonding part; at the same time, the dimensional range can also reduce the situation where the protruding parts cover the pole piece during the bonding process, thereby reducing the negative impact of the protruding parts on the pole piece during the process of combining to form a bonding part.

[0018] In some embodiments, in the width direction of the pole piece, the size of the joint portion ranges from 2 mm to 20 mm.

[0019] The technical solution of this embodiment provides some specific dimensional parameters of the joint. In the width direction of the electrode, the size range of the joint enables the joint to be relatively firm and will not collapse under pressure during the winding process. It also enables the diaphragm to still wrap the electrode when it is folded, thereby improving the stability of the diaphragm wrapping the electrode and improving the yield of the battery.

[0020] In some embodiments, the covering portion is in contact with the pole piece, or there is a gap between the covering portion and the pole piece.

[0021] To prevent the diaphragm from separating from the electrode, it is usually necessary to composite the electrode and the diaphragm. This composite process usually requires rolling with a roller. After rolling, there is a risk of reduced permeability of the diaphragm, which will lead to a decrease in the ion transmission efficiency of the diaphragm. Accordingly, the technical solution of this embodiment allows the diaphragm to be in contact with the electrode or there is a gap between the diaphragm and the electrode. Because the diaphragms on both sides of the electrode are connected along the width of the electrode by a joint, the diaphragm can be connected to the electrode through the joint without detaching the diaphragm. Therefore, there is no need to composite the diaphragm and the electrode, thereby alleviating the problem of reduced permeability of the diaphragm due to composite.

[0022] In some embodiments, the air permeability of the cover portion ranges from 100 s / cc to 300 s / cc.

[0023] The technical solution of this embodiment provides some specific parameters of the air permeability of the covering portion. The air permeability range of the covering portion enables the diaphragm to have a higher ion transmission efficiency at the covering portion, thereby improving the performance of the battery.

[0024] In some embodiments, in the length direction of the pole piece, the size of the joining portion is smaller than or equal to the size of the protruding portion.

[0025] The function of the joint is to fix the protruding portions of the two diaphragms to one side of the electrode, thereby preventing the diaphragms from being easily separated from the electrode, thereby reducing the exposure of the electrode to the outside world and contact with the adjacent electrode. Accordingly, the technical solution of this embodiment provides certain size ranges for the joint. When the size of the joint in the length direction of the electrode is equal to the size of the protruding portion, the protruding portions of the two diaphragms are completely connected. When the size of the joint in the length direction of the electrode is smaller than the size of the protruding portion, there is an unconnected opening between the protruding portions of the two diaphragms, so that the electrolyte can more easily enter between the two diaphragms through the opening. That is, the size of the joint in the length direction of the electrode is smaller than the size of the protruding portion, which can improve the wettability of the electrode and the diaphragm, thereby improving the performance of the battery.

[0026] In some embodiments, one side of the pole piece is provided with at least two joints spaced apart along the length direction of the pole piece, and a space is formed between the two joints;

[0027] In the thickness direction of the pole piece, a spacing space is also formed between the two protruding portions on both sides of the pole piece.

[0028] The technical solution of this embodiment provides some specific structures in which the size of the joint in the length direction of the electrode is smaller than the size of the protruding part, so that there are at least two joints, and the joints are arranged at intervals to form a spacing space between the joints. The spacing space is also formed between the two protruding parts. The spacing space can serve as an opening between the two diaphragms to improve the wettability of the electrode; as the number of joints increases, the spacing space also increases accordingly and is arranged at intervals along the length direction of the electrode, so that the electrolyte can enter between the two diaphragms more smoothly and evenly, so as to further improve the wettability of the electrode and the diaphragm, and further improve the performance of the battery.

[0029] In some embodiments, in the length direction of the pole piece, the size of the joint portion is greater than or equal to 2 mm, and the size of the separation space ranges from 2 mm to 100 mm.

[0030] The technical solution of this embodiment provides some dimensions of the joint and the spacing space in the length direction of the electrode, so that the two protruding parts can be stably connected at the joint, and the electrolyte can more easily enter between the two diaphragms at the spacing space. At the same time, the size range of the spacing space can also reduce the impact of the spacing space on the stability of the joint, so that the protruding part can be stably connected at the connection part and is not easy to collapse.

[0031] In some embodiments, at least two tab regions are provided on one side of the pole piece body, and the at least two tab regions are spaced apart along the length direction of the pole piece.

[0032] The technical solution of this embodiment provides some arrangement methods of the pole ear area, at least two pole ears are arranged at intervals along the length direction of the pole piece, so that the protruding parts can be connected to each other and form a joint part, and the protruding parts can also be connected to the pole ear area and form a joint part to fix the protruding parts, so that the folding of the diaphragm is not likely to cause the pole piece to be exposed.

[0033] In some embodiments, in the length direction of the pole piece, the length of the pole tab region is the same as the length of the pole piece body.

[0034] The technical solution of this embodiment provides other arrangements of the tab area, so that the size of the tab area in the length direction of the pole piece is the same as the size of the pole piece body in the length direction of the pole piece, so that the protruding portion can be connected to the tab area and form a joint to fix the protruding portion, so that the folding of the diaphragm is not likely to cause the pole piece to be exposed.

[0035] In some embodiments, in the width direction of the pole piece, the ratio of the size of the protruding portion to the size of the pole tab region ranges from 1:3 to 2:3.

[0036] The technical solution of this embodiment provides a relationship between the tab area and the protruding portion. The protruding portion has a strong adhesive force within this size range and can also reduce the influence of the diaphragm on the connection between the tab area and other structures.

[0037] In some embodiments, in the width direction of the pole piece, the difference between the size of the pole tab region and the size of the protruding portion ranges from 1 mm to 40 mm.

[0038] The technical solution of this embodiment provides a size range for the tab area to extend beyond the diaphragm portion, so as to facilitate the connection of the tab area with other structures and reduce the negative impact that the diaphragm may have on the connection stability of the tab area.

[0039] In some embodiments, a connection pattern is formed on the joint portion, and the protruding portions on opposite sides of the electrode are connected at the connection pattern.

[0040] The technical solution of this embodiment provides some ways to connect the protruding parts, so that the two protruding parts are connected through the connecting pattern and combined to form a connecting part. This arrangement can make the protruding parts have stronger stability at the connecting pattern, and make the protruding parts less likely to be detached at the connecting pattern due to external influences, thereby reducing the risks of short circuits and other risks that may be caused by the pole piece being exposed to the outside world.

[0041] In some embodiments, the connection pattern includes a curved pattern or a broken line pattern.

[0042] When the direction of force applied to the protruding portions at the connection pattern aligns with the direction in which the connection pattern extends, the protruding portions are more likely to separate from or break apart. However, when the direction of force applied to the protruding portions at the connection pattern differs from the direction in which the connection pattern extends, the connection pattern can better connect the two protruding portions. Accordingly, the technical solution of this embodiment provides several shapes for the connection pattern, allowing the connection pattern to be curved or folded, i.e., having multiple different extension directions. Because the direction of the external force applied to the protruding portions is typically relatively single and difficult to align with the shape of the connection pattern, this configuration can enhance the connection capability of the connection pattern and improve the stability of the joint.

[0043] In some embodiments, the electrode is a positive electrode and / or a negative electrode.

[0044] In the technical solution of this embodiment, the structure of the diaphragm and the joint can be applied to either the positive electrode sheet or the negative electrode sheet, or to both the positive electrode sheet and the negative electrode sheet at the same time, so as to further reduce the risk of short circuit caused by folding of the diaphragm.

[0045] In a second aspect, some embodiments of the present application further provide a battery cell, comprising the electrode assembly provided by some embodiments of the first aspect.

[0046] In a third aspect, some embodiments of the present application further provide a battery, comprising the electrode assembly provided by some embodiments of the first aspect, or the battery cell provided by some embodiments of the second aspect.

[0047] In a fourth aspect, some embodiments of the present application further provide an electrical device, comprising the electrode assembly provided by some embodiments of the first aspect, or the battery cell provided by some embodiments of the second aspect, or the battery provided by some embodiments of the third aspect.

[0048] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0050] FIG1 is a schematic diagram of the structure of an electrical device provided in some embodiments of the present application.

[0051] FIG2 is a schematic diagram of the exploded structure of a battery provided in some embodiments of the present application.

[0052] FIG3 is a schematic diagram of the exploded structure of a battery cell provided in some embodiments of the present application.

[0053] FIG4 is a schematic structural diagram of an electrode assembly provided in some embodiments of the present application.

[0054] FIG5 is a schematic cross-sectional view taken along line AA in FIG4 .

[0055] FIG6 is a schematic cross-sectional view of a section BB in FIG4 .

[0056] FIG7 is a schematic cross-sectional view of CC in FIG4 .

[0057] FIG8 is a schematic structural diagram of an electrode assembly provided in some embodiments of the present application.

[0058] FIG9 is a schematic structural diagram of the spacing arrangement of the joints in the electrode assembly provided in some embodiments of the present application.

[0059] 10 to 14 are schematic structural diagrams of different connection patterns in electrode assemblies provided in some embodiments of the present application.

[0060] 15 and 16 are schematic structural diagrams of electrode assemblies provided in some embodiments of the present application.

[0061] FIG17 is a schematic cross-sectional view of a battery cell provided in some embodiments of the present application.

[0062] FIG18 is a schematic diagram of the exploded structure of a battery cell provided in some embodiments of the present application.

[0063] FIG19 is a schematic diagram of the exploded structure of a battery provided in some embodiments of the present application.

[0064] The meanings of the marks in the figure are: 100, electrode assembly; 10, pole piece; 11, pole piece body; 12, pole ear area; 20, diaphragm; 21, covering part; 22, protruding part; 31, joint part; 311, connection pattern; 32, spacing space; 200, battery cell; 40, shell; 50, end cover; 300, battery; 60, box; 61, first part; 62, second part; 400, electrical device; 70, controller; 80, motor. Modes for Carrying Out the Invention

[0065] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0066] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0067] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0068] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0069] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0070] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0071] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0072] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0073] Currently, market developments indicate that power batteries are becoming increasingly widely used. They are not only used in energy storage systems such as hydropower, thermal, wind, and solar power plants, but are also widely used in electric vehicles like electric bicycles, electric motorcycles, and electric vehicles, as well as in military equipment and aerospace. As power battery applications continue to expand, market demand is also growing.

[0074] The electrode assembly is a crucial component of a battery's structure, and its winding or lamination process is crucial. In current electrode assemblies, the separator and electrode sheets are typically of equal or approximately equal area. However, during the winding or lamination process, the separator is prone to folding, exposing the electrode sheets. One of the functions of the separator is to separate the adjacent positive and negative electrodes, minimizing contact and short circuits, thereby reducing electrode assembly failures and negative impacts on electrode assembly yield.

[0075] In order to alleviate the situation where the electrode may be exposed due to the folding of the diaphragm, an embodiment of the present application provides an electrode assembly, in which the diaphragms on both sides of the electrode extend beyond the electrode to form an overhanging portion, and the two overhanging portions are combined to form a joint portion, which can cooperate with the two diaphragms to wrap the electrode.

[0076] In such an electrode assembly, since the two diaphragms wrap the end of the electrode adjacent to the joint through the joint, it is equivalent to combining the two diaphragms through the joint to form a spacer sleeve that is sleeved outside the electrode, and the spacer sleeve is closed at the joint. At this time, the folding of the diaphragm will not cause the electrode to be exposed, and the electrode is not easy to move outside the diaphragm on the side with the joint, thereby reducing the situation where the electrode is exposed outside the diaphragm and causes contact with the adjacent electrode and short circuit, thereby improving the yield of the battery.

[0077] The battery cells disclosed in the embodiments of the present application can be used in electrical devices that use batteries as power sources or various energy storage systems that use batteries as energy storage elements. Electrical devices can include, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, battery-powered vehicles, electric vehicles, ships, spacecraft, and the like. Electric toys can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, among others.

[0078] For the convenience of description, the following embodiments are described by taking an electric device 400 of an embodiment of the present application as a vehicle as an example.

[0079] Referring to Figure 1, Figure 1 is a schematic diagram of the structure of a vehicle provided in some embodiments of the present application. The vehicle can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 300 is provided inside the vehicle, and the battery 300 can be provided at the bottom, head or tail of the vehicle. The battery 300 can be used to power the vehicle. For example, the battery 300 can be used as an operating power source for the vehicle. The vehicle can also include a controller 70 and a motor 80. The controller 70 is used to control the battery 300 to power the motor 80, for example, for starting, navigating and operating power requirements during driving of the vehicle.

[0080] In some embodiments of the present application, the battery 300 can serve not only as the operating power source of the vehicle, but also as the driving power source of the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0081] Referring to Figure 2, Figure 2 is an exploded view of a battery 300 provided in some embodiments of the present application. The battery 300 includes a housing 60 and a battery cell 200, with the battery cell 200 housed within the housing 60. The housing 60 is used to provide a storage space for the battery cell 200, and the housing 60 can have a variety of structures. In some embodiments, the housing 60 can include a first portion and a second portion, the first portion and the second portion overlapping each other, and the first portion and the second portion together define a storage space for accommodating the battery cell 200. The second portion can be a hollow structure with one end open, and the first portion can be a plate-like structure, with the first portion overlapping the open side of the second portion, so that the first portion and the second portion together define a storage space. The first portion and the second portion can also be hollow structures with one end open, with the open side of the first portion overlapping the open side of the second portion. Of course, the housing 60 formed by the first and second portions can have a variety of shapes, such as a cylinder, a rectangular parallelepiped, etc.

[0082] In the battery 300, there may be multiple battery cells 200, and the multiple battery cells 200 may be connected in series, in parallel, or in a hybrid connection. A hybrid connection refers to a combination of series and parallel connections among the multiple battery cells 200. The multiple battery cells 200 may be directly connected in series, in parallel, or in a hybrid connection, and then the entire battery 300 structure may be housed within the housing 60. Of course, the battery 300 may also be formed by first connecting multiple battery cells 200 in series, in parallel, or in a hybrid connection to form a battery 300 module, and then the multiple battery 300 modules may be connected in series, in parallel, or in a hybrid connection to form a complete battery 300 structure and housed within the housing 60. The battery 300 may also include other structures, for example, the battery 300 may also include a busbar component for electrically connecting the multiple battery cells 200.

[0083] Each battery cell 200 may be a secondary battery or a primary battery, a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 200 may be cylindrical, flat, rectangular, or in other shapes.

[0084] Referring to Figure 3, Figure 3 is a schematic diagram of the exploded structure of a battery cell 200 provided in some embodiments of the present application. A battery cell 200 is the smallest unit that makes up a battery 300. As shown in the figure, the battery cell 200 includes an end cap 50, a housing 40, an electrode assembly 100, and other functional components.

[0085] The end cap 50 is a component that covers the opening of the housing 40 to isolate the internal environment of the battery cell 200 from the external environment. The shape of the end cap 50 can be adapted to the shape of the housing 40 to fit the housing 40. Optionally, the end cap 50 can be made of a material with a certain hardness and strength (such as an aluminum alloy). This prevents the end cap 50 from deforming when subjected to compression or collision, thereby providing the battery cell 200 with greater structural strength and improved safety. The end cap 50 can be provided with functional components such as electrode terminals. The electrode terminals can be used to electrically connect to the electrode assembly 100 to output or input electrical energy to or from the battery cell 200. In some embodiments, the end cap 50 can also be provided with a pressure relief mechanism for relieving internal pressure when the internal pressure or temperature of the battery cell 200 reaches a threshold. The end cap 50 can be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this is not particularly limited in the present embodiments. In some embodiments, an insulating member may be provided inside the end cap 50 to isolate the electrical connection components in the housing 40 from the end cap 50 to reduce the risk of short circuit.

[0086] The housing 40 is a component that cooperates with the end cap 50 to form an internal environment for the battery cell 200. This internal environment can be used to accommodate the electrode assembly 100, electrolyte, and other components. The housing 40 and end cap 50 can be separate components. An opening can be provided in the housing 40, and the end cap 50 is placed over the opening to form the internal environment of the battery cell 200. Alternatively, the end cap 50 and housing 40 can be integrated. Specifically, the end cap 50 and housing 40 can form a common connection surface before other components are inserted into the housing. When the interior of the housing 40 needs to be enclosed, the end cap 50 is placed over the housing 40. The housing 40 can have a variety of shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the housing 40 can be determined based on the specific shape and size of the electrode assembly 100. The housing 40 can be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this embodiment of the present application does not impose any particular limitations on this.

[0087] The electrode assembly 100 is a component in the battery cell 200 where electrochemical reactions occur. One or more electrode assemblies 100 may be contained in the shell 40. The electrode assembly 100 is mainly formed by winding or stacking a positive electrode sheet and a negative electrode sheet, and a separator 20 is usually provided between the positive electrode sheet and the negative electrode sheet. The portions of the positive electrode sheet and the negative electrode sheet with active materials constitute the electrode body 11 of the electrode assembly 100, and the portions of the positive electrode sheet and the negative electrode sheet without active materials each constitute the tab region 12. The positive tab region and the negative tab region may be located together at one end of the electrode body 11 or respectively at both ends of the electrode body 11. During the charge and discharge process of the battery 300, the positive electrode active material and the negative electrode active material react with the electrolyte, and the tab region 12 connects the electrode terminals to form a current loop.

[0088] According to some embodiments of the present application, refer to Figures 4 and 5, where Figure 4 is a structural schematic diagram of the electrode assembly 100 provided in some embodiments of the present application, and Figure 5 is a cross-sectional schematic diagram at AA in Figure 4.

[0089] In the figure, the direction of the X-axis is the length direction of the pole piece 10 , the direction of the Y-axis is the width direction of the pole piece 10 , and the direction of the Z-axis is the thickness direction of the pole piece 10 .

[0090] An embodiment of the present application provides an electrode assembly 100, including a pole piece 10 and a diaphragm 20, wherein the pole piece 10 includes a pole piece body 11 and a pole tab area 12; the diaphragm 20 is arranged on opposite sides of the pole piece 10 along the thickness direction of the pole piece 10, and the diaphragm 20 includes a covering portion 21 covering the pole piece 10 and a protruding portion 22 connected to the covering portion 21, and the protruding portion 22 covers part of the pole tab area 12; the protruding portions 22 on opposite sides of the pole piece 10 are at least partially connected to each other and form a joint portion 31, and the protruding portions 22 on opposite sides of the pole piece 10 are at least partially connected to the pole tab area 12 and form a joint portion 31.

[0091] The separator 20 is a porous, insulating, membrane-like structure. It is a crucial component of the battery 300 and is typically positioned between two adjacent electrode sheets 10 to separate them and reduce the risk of short circuits caused by contact between the electrode sheets 10 of the electrode assembly 100. The separator 20 of the battery 300 typically has nanoscale pores within it, allowing lithium ions and other ions to pass freely during charging and discharging, providing a pathway for ion transport between the electrode sheets 10.

[0092] The diaphragm 20 includes a covering portion 21 and a protruding portion 22 . In addition to the covering portion 21 and the protruding portion 22 , other structures may be connected or set on the diaphragm 20 .

[0093] The covering portion 21 refers to the portion of the diaphragm 20 that is opposite to the electrode 10. For example, the portion covered by the projection of the electrode 10 on the diaphragm 20 can be set as the covering portion 21, or the covering portion 21 can be set or formed in other ways so that the covering portion 21 is opposite to the electrode 10; the shape of the covering portion 21 can be rectangular or other shapes. Depending on the covering function, the shape of the covering portion 21 can be the same as the shape of the electrode 10.

[0094] The protruding portion 22 refers to the portion of the diaphragm 20 that protrudes beyond the pole piece 10. Specifically, the projection of the protruding portion 22 on the pole piece 10 along the thickness direction (Z) of the pole piece 10 falls outside the pole piece 10; the protruding portion 22 can extend from the covering portion 21 to the outside of the pole piece 10 along the width direction Y of the pole piece 10, and the protruding portion 22 can also extend from the covering portion 21 to the outside of the pole piece 10 along the length direction X of the pole piece 10; the shape of the protruding portion 22 can be a rectangle, or it can be a triangle, trapezoid or other shapes.

[0095] The protruding portion 22 is connected to the covering portion 21. Specifically, the protruding portion 22 can be integrally formed with the covering portion 21, that is, the protruding portion 22 and the covering portion 21 are both parts set on the diaphragm 20. The protruding portion 22 can also be connected to the covering portion 21 by welding, bonding or other means.

[0096] Since the electrode assembly 100 is mainly formed by winding or stacking the electrode sheets 10, the electrode sheets 10 are usually adjacent to another electrode sheet 10 in the width direction, so the diaphragm 20 is arranged on the opposite sides of the electrode sheet 10 along the thickness direction of the electrode sheet 10 to separate the electrode sheet 10 from the adjacent electrode sheet 10, thereby reducing the contact between the adjacent electrode sheets 10; specifically, the covering portion 21 of the diaphragm 20 is opposite to the electrode sheet 10, and its main function is to reduce the contact between the electrode sheet 10 and the adjacent electrode sheet 10 in the thickness direction, so as to reduce the occurrence of short circuits between the electrode sheets 10.

[0097] An accommodating space for accommodating the pole piece 10 is formed between the two covering parts 21 . The covering part 21 can be connected to the pole piece 10 . For example, the covering part 21 can be in contact with the pole piece 10 or bonded to the pole piece 10 . There can also be a gap between the covering part and the pole piece 10 .

[0098] The protruding portion 22 extends from the covering portion 21 to the outside of the pole piece 10, and the two protruding portions 22 on both sides of the pole piece 10 along the thickness direction can be at least partially interconnected on one side of the pole piece 10 to form a joint portion 31. The joint portion 31 can form a blocking structure on the corresponding side of the accommodating space. At this time, the pole piece 10 is not easily exposed to the outside world from this side. Even if the diaphragm 20 is folded, etc., the pole piece 10 is not easily exposed to the outside world and contacts with another adjacent pole piece 10 under the blocking of the joint portion 31, thereby reducing the occurrence of short circuits between the pole pieces 10; the mutual connection of the two protruding portions 22 can be achieved by welding, rolling, gluing or other methods.

[0099] The two protruding portions 22 on both sides of the pole piece 10 along the thickness direction can also be at least partially connected to the pole ear area 12 on one side of the pole piece 10 to form a joint 31. At this time, the joint 31 can also form a blocking structure on the corresponding side of the accommodating space to block the pole piece 10 from being exposed to the outside world.

[0100] Since the tab area 12 also needs to be connected to the electrode terminal, the protruding portion 22 should not completely cover the tab area 12, that is, the protruding portion 22 only covers part of the tab area 12, thereby leaving space on the tab area 12 so that the tab area 12 can be connected to the electrode terminal, reducing the negative impact of the protruding portion 22 on the connection between the tab area 12 and the electrode terminal.

[0101] The joint 31 can be arranged on either side or both sides of the pole piece 10 along the width direction, and the joint 31 can also be arranged on either side or both sides of the pole piece 10 along the length direction; the position of the joint 31 can be determined according to the actual situation of the winding process of the pole piece 10. For example, if the diaphragm 20 on one side is easy to fold during the winding process of the pole piece 10, the joint 31 can be arranged on that side.

[0102] The two protruding portions 22 on one side of the electrode 10 can be completely connected or partially connected with a gap; in the length direction or width direction of the electrode 10, the joint 31 formed by the connected parts of the two protruding portions 22 of the electrode can prevent the electrode 10 from moving relative to the diaphragm 20 outside the accommodation space, that is, the joint 31 can prevent the electrode 10 from being exposed to the outside world and contacting another adjacent electrode to cause a short circuit, etc.

[0103] The joint 31 cooperates with the two covering parts 21 to wrap the adjacent end of the electrode 10 and the joint 31, which is equivalent to combining the two diaphragms 20 through the joint 31 to form a spacer sleeve arranged outside the electrode 10. At this time, the folding of the diaphragm 20 will not cause the electrode 10 to be exposed, and the electrode 10 is not easy to move outside the diaphragm 20 on the side with the joint 31, thereby reducing the situation where the electrode 10 is exposed outside the diaphragm 20 and causes contact with the adjacent electrode 10 and a short circuit, thereby improving the yield of the battery 300.

[0104] In this embodiment, a diaphragm 20 is provided on both sides of the electrode 10, and the diaphragm 20 includes a covering portion 21 covering the electrode 10 and a protruding portion 22 extending outside the electrode 10. Then, the protruding portions 22 on both sides of the electrode 10 are combined to form a coupling portion 31, so that the coupling portion 31 can cooperate with the two diaphragms 20 to wrap the end of the electrode 10 adjacent to the coupling portion 31, which is equivalent to combining the two diaphragms 20 through the coupling portion 31 to form a spacer sleeve arranged outside the electrode 10, and the spacer sleeve is closed at the coupling portion 31. At this time, the folding of the diaphragm 20 will not cause the electrode 10 to be exposed, and the electrode 10 is not easy to move outside the diaphragm 20 on the side with the coupling portion 31, thereby reducing the situation where the electrode 10 is exposed outside the diaphragm 20 and causes contact with the adjacent electrode 10 and a short circuit, thereby improving the yield of the battery 300.

[0105] According to some embodiments of the present application, in the width direction of the pole piece 10 , protruding portions 22 are provided on both sides of the covering portion 21 , and bonding portions 31 are provided on two opposite sides of the pole piece 10 .

[0106] The covering portion 21 is provided with protruding portions 22 on both sides of the electrode piece 10 along the width direction Y, so that the electrode piece 10 is provided with a connecting portion 31 on both opposite sides along the width direction Y, so that the two sides of the electrode piece 10 along the width direction Y are not easily exposed to the outside world, thereby reducing the situation where the electrode piece 10 is exposed outside the diaphragm 20 and causes contact with the adjacent electrode piece 10 and a short circuit.

[0107] Because the electrode 10 and the diaphragm 20 are usually wound along the length direction X during the winding process, the two sides of the diaphragm 20 along the width direction Y are usually easily folded due to the winding equipment or other external influences. Therefore, in this embodiment, protruding portions 22 are provided on both sides of the covering portion 21 along the width direction of the electrode 10 to form a joint portion 31 on both sides of the electrode 10 along the width direction. At this time, the two diaphragms 20 form a pocket-like structure to accommodate the electrode 10. The electrode 10 is wrapped between the two diaphragms 20 and is not easily exposed to the outside world. At this time, even if the diaphragm 20 is folded, the electrode 10 is not easy to contact another adjacent electrode 10 and cause a short circuit, thereby further improving the yield of the battery 300.

[0108] In other embodiments, in addition to being provided on both sides of the electrode sheet 10 along the width direction of the electrode sheet 10, the joint portion 31 can also be provided on both sides of the electrode sheet 10 along the length direction of the electrode sheet 10. That is, the protruding portions 22 of the two diaphragms 20 can form a closed accommodation space after being combined, and the electrode sheet 10 is accommodated in the closed accommodation space, and the electrode sheet 10 is completely wrapped by the two diaphragms 20. In this case, any part of the diaphragm 20 is folded in any direction without exposing the electrode sheet 10 to the outside world, making it less likely that the electrode sheet 10 will contact another adjacent electrode sheet 10 and cause a short circuit, further improving the yield of the battery 300.

[0109] According to some embodiments of the present application, refer to Figures 4 to 6, wherein Figure 4 is a structural schematic diagram of the electrode assembly 100 provided in some embodiments of the present application, Figure 5 is a cross-sectional schematic diagram at AA in the electrode assembly 100 provided in Figure 4, and Figure 6 is a cross-sectional schematic diagram at BB in the electrode assembly 100 provided in Figure 5.

[0110] In Figures 4 to 6, the direction of the X-axis is the length direction of the pole piece 10, the direction of the Y-axis is the width direction of the pole piece 10, and the direction of the Z-axis is the thickness direction of the pole piece 10; in Figures 5 and 6, W1 is the size of the protruding portion 22 of the diaphragm 20 in the width direction of the pole piece 10, and W2 is the size of the joint 31 in the width direction of the pole piece 10.

[0111] In some embodiments of the present application, in the width direction of the pole piece 10 , the size of the joining portion 31 is smaller than or equal to the size of any protruding portion 22 , that is, W2 ≤ W1 .

[0112] The dimension of the joint portion 31 in the width direction Y of the pole piece 10 can be equal to the dimension of the protruding portion 22 in the width direction Y of the pole piece 10. In this case, when the joint portion 31 is formed, the protruding portions 22 on both sides of the pole piece 10 are completely connected, and the joint portion 31 is not easy to contact or connect with the pole piece 10 during the formation process, thereby reducing the possibility of damage to the pole piece 10 during the formation process of the joint portion 31 and reducing the negative impact on the pole piece 10.

[0113] The dimension of the joint portion 31 in the width direction Y of the electrode 10 may also be smaller than the dimension of the protruding portion 22 in the width direction Y of the electrode 10; in this case, a gap exists between the electrode 10 and the joint portion 31 in the width direction Y of the electrode 10. This arrangement makes it difficult for the joint portion 31 to contact or connect with the electrode 10 during the formation process, thereby reducing the possibility of damage to the electrode 10 during the formation process of the joint portion 31 and reducing the negative impact on the electrode 10.

[0114] Because the joining portion 31 is formed by connecting two protruding portions 22, and the main function of the joining portion 31 is to connect the two diaphragms 20 so that the two diaphragms 20 can better wrap the electrode 10, in this embodiment, the size of the joining portion 31 in the width direction of the electrode 10 is smaller than or equal to the size of the protruding portions 22, so as to reduce the situation where the covering portion 21 divides the electrode 10 when the two protruding portions 22 are combined, thereby reducing the negative impact on the electrode 10 during the process of the protruding portions 22 combining to form the joining portion 31, and further improving the yield of the battery 300.

[0115] 5 and 6 , in some embodiments, the size of the protruding portion 22 in the width direction of the pole piece 10 ranges from 2 mm to 20 mm, i.e., 2 mm ≤ W1 ≤ 20 mm. Specifically, the size of the protruding portion 22 in the width direction of the pole piece 10 can be 2 mm, 5 mm, 7 mm, 10 mm, 12 mm, 15 mm, 17 mm, 20 mm, or other values.

[0116] The size range of the protruding portion 22 is 2 mm to 20 mm, which can ensure that the two protruding portions 22 have sufficient length to stably connect to form the bonding portion 31, and can also reduce the possibility that the protruding portions 22 damage the pole piece 10 or have a negative impact on the pole piece 10 during the bonding process.

[0117] After the electrode sheet 10 and separator 20 are wound to form the electrode assembly 100, the protruding portion 22 will be located outside the electrode sheet 10. That is, after the electrode assembly 100 is installed in the housing 40, the protruding portion 22 will occupy space within the housing 40. Therefore, the larger the size of the protruding portion 22, the greater the negative impact on the energy density of the electrode assembly 100. Therefore, setting the size of the protruding portion 22 within the range of 2 mm to 20 mm can also reduce the space occupied by the protruding portion 22 within the housing 40 and reduce the negative impact of the protruding portion 22 on the energy density of the electrode assembly 100.

[0118] This embodiment provides some specific dimensional parameters of the protruding portion 22. In the width direction of the electrode 10, the dimensional range of the protruding portion 22 is such that the two protruding portions 22 have sufficient length to extend beyond the electrode 10 and to combine to form a bonding portion 31. At the same time, this dimensional range can also reduce the occurrence of the protruding portion 22 covering the electrode 10 during the bonding process, thereby reducing the negative impact of the protruding portion 22 on the electrode 10 during the bonding process to form the bonding portion 31. At the same time, this dimensional range can also reduce the negative impact of the protruding portion 22 on the energy density of the electrode assembly 100.

[0119] 5 and 6 , in some embodiments, the dimension of the joint portion 31 in the width direction of the pole piece 10 ranges from 2 mm to 20 mm, i.e., 2 mm ≤ W2 ≤ 20 mm. Specifically, the dimension of the joint portion 31 in the width direction of the pole piece 10 can be 2 mm, 5 mm, 7 mm, 10 mm, 12 mm, 15 mm, 17 mm, 20 mm, or other values.

[0120] The size range of the bonding portion 31 is 2 mm to 20 mm, which can ensure that the size of the bonding portion 31 is less than or equal to the size of the protruding portion 22. The two bonding portions 31 can have sufficient length to be stably connected to form the bonding portion 31, and can also reduce the possibility that the bonding portion 31 damages the pole piece 10 or has a negative impact on the pole piece 10 during the bonding process.

[0121] Because the electrode sheet 10 and the separator 20 are wound to form the electrode assembly 100, the joint 31 will be located outside the electrode sheet 10. That is, the joint 31 will occupy the space inside the housing 40 after the electrode assembly 100 is installed in the housing 40. Therefore, the size of the joint 31 should not be too large to reduce the space occupied by the joint 31 inside the housing 40 and reduce the impact of the joint 31 on the energy density of the electrode assembly 100. Therefore, the size of the joint 31 is set in the range of 2 mm to 20 mm, which can also reduce the negative impact of the joint 31 on the energy density of the electrode assembly 100.

[0122] This embodiment provides some specific dimensional parameters of the joint 31. In the width direction of the electrode 10, the size range of the joint 31 enables the joint 31 to be relatively firm and not to collapse under pressure during the winding process, and also enables the diaphragm 20 to still wrap the electrode 10 when folded, thereby improving the stability of the diaphragm 20 wrapping the electrode 10 and improving the yield of the battery 300; at the same time, it can also reduce the negative impact of the joint 31 on the energy density of the electrode assembly 100.

[0123] According to some embodiments of the present application, refer to Figures 4 to 6, wherein Figure 4 is a structural schematic diagram of the electrode assembly 100 provided in some embodiments of the present application, Figure 5 is a cross-sectional schematic diagram at AA in the electrode assembly 100 provided in Figure 4, and Figure 6 is a cross-sectional schematic diagram at BB in the electrode assembly 100 provided in Figure 5.

[0124] In some embodiments of the present application, the covering portion 21 is in contact with the pole piece 10 , or there is a gap between the covering portion 21 and the pole piece 10 .

[0125] In order to reduce the possibility of the diaphragm 20 being separated from the electrode 10, resulting in the electrode 10 being exposed and connected to the adjacent electrode 10, the diaphragm 20 is currently mostly composited on the electrode 10; and the composite of the diaphragm 20 and the electrode 10 mostly includes a rolling process. The rolling of the diaphragm 20 and the electrode 10 can easily have a negative impact on the air permeability of the diaphragm 20, and may even cause the closure of the pores of the diaphragm 20, thereby having a negative impact on the transmission efficiency of lithium ions and other plasmas.

[0126] In this embodiment, by providing a joint portion 31 on both sides of the electrode 10 along the width direction Y, the diaphragm 20 can be fixed on the electrode 10 more stably through the joint portions 31 on both sides of the electrode 10, and the diaphragm 20 is not easily separated from the electrode 10 and the electrode 10 is not easily exposed to the outside world. Therefore, at this time, the diaphragm 20 does not need to be connected to the electrode 10 by rolling or other processes, that is, the covering portion 21 can be in contact with the electrode 10, or there is a gap between the covering portion 21 and the electrode 10, so that the covering portion 21 has better air permeability.

[0127] It can be understood that if it is necessary to reduce the space occupied by the electrode 10 and the diaphragm 20, the gap between the covering portion 21 and the electrode 10 can be reduced by controlling the size of the protruding portion 22 in the width direction Y and the size of the bonding portion 31 in the width direction Y, or the gap between the covering portion 21 and the electrode 10 can be reduced by tensioning the diaphragm 20 or other means.

[0128] In order to prevent the diaphragm 20 from separating from the electrode 10, it is usually necessary to composite the electrode 10 and the diaphragm 20. However, during the composite process, the electrode 10 and the diaphragm 20 usually need to be rolled by a pressing roller. After rolling, there is a risk that the air permeability of the diaphragm 20 will be reduced. The reduced air permeability will lead to a reduction in the ion transmission efficiency of the diaphragm 20. Accordingly, in this embodiment, the diaphragm 20 is in contact with the electrode 10 or there is a gap between the diaphragm 20 and the electrode 10. Because the diaphragm 20 on both sides of the electrode 10 along the width direction of the electrode 10 is connected by the joint 31, the diaphragm 20 can be connected to the electrode 10 through the joint 31 without the diaphragm 20 being separated. Therefore, there is no need to composite the diaphragm 20 and the electrode 10, thereby alleviating the problem of reduced air permeability of the diaphragm 20 due to the composite.

[0129] In some embodiments, the air permeability of the covering portion 21 ranges from 100 seconds per cubic centimeter (s / cc) to 300s / cc. Specifically, the air permeability of the covering portion 21 can be 100s / cc, 150s / cc, 200s / cc, 250s / cc, 300s / cc or other values.

[0130] Air permeability refers to the permeability of air through fabrics (including traditional textiles and their products, non-woven fabrics, blankets, high-permeability paper, filter media, leather, polyethylene film, polytetrafluoroethylene film, polyurethane foam, various felts, etc.). It is expressed as the rate of airflow vertically through the sample under specified sample area, pressure drop, and time conditions. Therefore, air permeability represents the amount of air that passes through the material per second. In this embodiment, the unit of air permeability is s / cc, where s is the time unit, which refers to seconds, and cc is the volume unit, which refers to cubic centimeter (cm3). 3 ), the conversion relationship is 1 cubic meter = 1000 cubic decimeters = 1000000 cubic centimeters.

[0131] If the permeability of the diaphragm 20 is too high, the pores of the diaphragm 20 are equivalent to closed pores, the ions of the electrolyte cannot pass through, and high ion conductivity performance cannot be achieved; while if the permeability is too low, the pores of the diaphragm 20 are connected, the ion permeation resistance is low, and the energy density is high.

[0132] The covering portion 21 has the function of allowing ions in the electrolyte to pass through while reducing the passage of other substances. Therefore, setting the air permeability of the covering portion 21 within the range of 100s / cc to 300s / cc can not only reduce the resistance to the passage of ions but also effectively block large particles of other substances.

[0133] Under the action of the combining portion 31, the protruding portion 22 and the covering portion 21, the electrode 10 can be wrapped between the two diaphragms 20 and is not easily exposed to the outside world. Therefore, there is no need to roll and compound the diaphragm 20 and the electrode 10, so that the air permeability range of the covering portion 21 can be set within the range of 100s / cc to 300s / cc, thereby making the ions have a higher transmission efficiency.

[0134] This embodiment also provides some specific parameters of the air permeability of the covering portion 21 . The air permeability range of the covering portion 21 enables the diaphragm 20 to have a higher ion transmission efficiency at the covering portion 21 , thereby improving the performance of the battery 300 .

[0135] According to some embodiments of the present application, referring to FIG. 8 , FIG. 8 is a schematic structural diagram of the electrode assembly 100 provided in some embodiments of the present application in which the joints 31 are arranged at intervals.

[0136] In the figure, the direction of the X-axis is the length direction of the pole piece 10 , and the direction of the Y-axis is the width direction of the pole piece 10 .

[0137] In some embodiments of the present application, in the length direction of the pole piece 10 , the size of the joining portion 31 is smaller than or equal to the size of the protruding portion 22 .

[0138] The dimension of the joint 31 in the length direction of the pole piece 10 can be equal to the dimension of the protruding portion 22 in the length direction of the pole piece 10, that is, the joint 31 can close the accommodation space formed between the two diaphragms 20. At this time, the accommodation space does not have an opening on the side where the joint 31 is located. This setting can reduce the occurrence of the joint 31 collapsing and improve the stability of the joint 31.

[0139] Because the junction 31 is formed by connecting two connecting portions, the flow performance of the electrolyte at the junction 31 will be weaker than the flow performance of the electrolyte at the covering portion 21 and the protruding portion 22. Accordingly, the dimension of the junction 31 in the length direction of the electrode 10 can also be made smaller than the dimension of the protruding portion 22 in the length direction of the electrode 10. In other words, the junction 31 cannot completely seal the accommodation space formed between the two diaphragms 20. In this case, the accommodation space has an opening on the side where the junction 31 is located, and the electrolyte can also enter the accommodation space through this opening, thereby improving the wettability of the electrode 10 and the diaphragm 20.

[0140] Since the function of the joint 31 is to fix the protruding portions 22 of the two diaphragms 20 on one side of the electrode 10, the diaphragm 20 is not easily separated from the electrode 10, thereby reducing the situation where the electrode 10 is exposed to the outside and contacts the other adjacent electrode 10. Accordingly, this embodiment provides some size ranges of the joint 31. When the size of the joint 31 in the length direction of the electrode 10 is equal to the size of the protruding portion 22, the protruding portions 22 of the two diaphragms 20 are completely connected; when the size of the joint 31 in the length direction of the electrode 10 is smaller than the size of the protruding portion 22, there is an unconnected opening between the protruding portions 22 of the two diaphragms 20, so that the electrolyte can more easily enter between the two diaphragms 20 from the opening, that is, the size of the joint 31 in the length direction of the electrode 10 is smaller than the size of the protruding portion 22, which can improve the wettability of the electrode 10 and the diaphragm 20, thereby improving the performance of the battery 300.

[0141] Referring to Figure 8, in some embodiments, one side of the pole piece 10 is provided with at least two connecting portions 31 arranged at intervals along the length direction of the pole piece 10, and a spacing space 32 is formed between the two connecting portions 31; in the thickness direction of the pole piece 10, the spacing space 32 is also formed between the two protruding portions 22 on both sides of the pole piece 10.

[0142] At least two spaced-apart joints 31 are provided on one side of the pole piece 10. The number of the joints 31 may be two, or three or more. The plurality of joints 31 are arranged in sequence along the length direction X of the pole piece 10 so that the protruding portions 22 on both sides of the width direction (Z) of the pole piece 10 can be connected at the joints 31, thereby reducing the exposure of the pole piece 10.

[0143] A spacing space 32 can be formed between two adjacent joints 31. Similar to the joints 31, the spacing space 32 can also be arranged in sequence along the length direction X of the electrode 10, so that the spacing space 32 and the joints 31 can be arranged alternately in sequence; in the thickness direction of the electrode 10, the spacing space 32 is also formed between the two protruding portions 22, and a channel for electrolyte flow is formed between the two protruding portions 22 or within the two protruding portions 22.

[0144] Since there should be no wrinkles when the diaphragm 20 covers the electrode 10, the two protruding portions 22 should be in contact with each other or there should be a small gap at the position corresponding to the spacing space 32; when the two protruding portions 22 are in contact with each other, the flow performance of the electrolyte in the spacing space 32 is also stronger than the flow performance of the electrolyte at the joint 31, so the channel for the electrolyte to flow is formed in the two protruding portions 22 at this time; when there is a small gap between the two protruding portions 22, the electrolyte can enter the accommodation space through the gap, and the channel for the electrolyte to flow also includes the gap.

[0145] As the number of joints 31 increases, the number of spacing spaces 32 will also increase accordingly; and because the spacing spaces 32 are arranged at intervals on one side of the electrode 10, as the number of spacing spaces 32 increases, the arrangement of the spacing spaces 32 will be more uniform, so that the electrolyte can enter the accommodating space more smoothly and evenly, thereby further improving the wettability of the electrode 10 and the diaphragm 20.

[0146] This embodiment provides some specific structures in which the size of the connecting portion 31 in the length direction X of the electrode 10 is smaller than the size of the protruding portion 22, so that there are at least two connecting portions 31, and the connecting portions 31 are arranged at intervals to form an interval space 32 between the connecting portions 31, and the interval space 32 is also formed between the two protruding portions 22. The interval space 32 can serve as an opening between the two diaphragms 20 to improve the wettability of the electrode 10; as the number of connecting portions 31 increases, the interval spaces 32 also increase accordingly and are arranged at intervals along the length direction of the electrode 10, so that the electrolyte can enter between the two diaphragms 20 more smoothly and evenly, so as to further improve the wettability of the electrode 10 and the diaphragm 20, and further improve the performance of the battery 300.

[0147] 8 , in some embodiments, in the length direction of the pole piece 10 , the size of the joint portion 31 is greater than or equal to 2 mm, and the size of the separation space 32 ranges from 2 mm to 100 mm.

[0148] In the figure, L1 is the dimension of the joint portion 31 in the length direction X of the pole piece 10 , and L2 is the dimension of the separation space 32 in the length direction X of the pole piece 10 .

[0149] The specific size of the joint 31 in the length direction X can be 2 mm, 5 mm, 10 mm, 20 mm or other values. The size of the joint 31 in the length direction of the pole piece 10 is greater than or equal to 2 mm to make the joint 31 more stable and reduce the possibility of the joint 31 collapsing.

[0150] The specific size of the spacing space 32 in the length direction X can be 2mm, 5mm, 10mm, 20mm, 30mm, 50mm, 70mm, 100mm, or other values. This configuration allows the electrolyte to better enter the accommodation space, so that the electrode 10 and the diaphragm 20 have better wettability. This configuration also allows the protruding portion 22 to maintain a more stable connection, reducing the possibility of the protruding portion 22 collapsing.

[0151] This embodiment provides some dimensions of the joint 31 and the spacing space 32 in the length direction of the electrode 10, so that the two protruding portions 22 can be stably connected at the joint 31, and the electrolyte can more easily enter between the two diaphragms 20 at the spacing space 32. At the same time, the size range of the spacing space 32 can also reduce the impact of the spacing space 32 on the stability of the joint 31, so that the protruding portion 22 can be stably connected at the connection portion and is not easy to collapse.

[0152] 4 , in some embodiments, at least two tab regions 12 are provided on one side of the pole piece body 11 , and the at least two tab regions 12 are spaced apart along the length direction X of the pole piece 10 .

[0153] The portion of the electrode 10 with active material constitutes the electrode body 11 of the electrode assembly 100, while the portion of the electrode 10 without active material constitutes the electrode ear area 12 of the electrode assembly 100. If the portion of the electrode 10 without active material is die-cut or otherwise formed, at least two spaced-apart electrode ear areas 12 can be formed on one side of the electrode body 11.

[0154] At this time, the protruding portions 22 on both sides of the pole piece 10 along the thickness direction (Z) can be connected to each other at the intervals of the pole tab area 12 to form a joint 31, and the protruding portions 22 on both sides of the pole piece 10 along the thickness direction (Z) can also be connected to the pole tab area 12 to form a joint 31.

[0155] This arrangement of the tab area 12 is mostly used in square shell batteries, but can also be used in cylindrical batteries or other batteries.

[0156] This embodiment provides some arrangements of the tab areas 12, where at least two tab areas 12 are spaced apart along the length direction of the pole piece 10, so that the protruding portions 22 can be connected to each other and form a joint 31, or the protruding portions 22 can be connected to the tab areas 12 and form a joint 31 to fix the protruding portions 22, so that the folding of the diaphragm 20 is not likely to cause the pole piece 10 to be exposed.

[0157] 8 , in some embodiments, in the length direction X of the pole piece 10 , the length of the pole tab region 12 is the same as the length of the pole piece body 11 .

[0158] The portion of the electrode 10 having active material constitutes the electrode body 11 of the electrode assembly 100, while the portion of the electrode 10 not having active material constitutes the electrode ear area 12 of the electrode assembly 100. If the portion of the electrode 10 not having active material is not die-cut or other forming processes are not performed on the portion of the electrode 10 not having active material, a electrode ear area 12 having the same length as the electrode body 11 can be formed on one side of the electrode body 11.

[0159] At this time, the protruding portions 22 on both sides of the pole piece 10 along the thickness direction (Z) are connected to the pole tab area 12 to form a joint portion 31, and the protruding portions 22 are fixed on the pole tab area 12. At this time, the folding of the diaphragm 20 will not easily cause the pole piece 10 to be exposed to the outside world.

[0160] This embodiment provides other arrangements of the tab area 12, so that the size of the tab area 12 in the length direction X of the pole piece 10 is the same as the size of the pole piece body 11 in the length direction X of the pole piece 10, so that the protruding portion 22 can be connected to the tab area 12 and form a joint 31 to fix the protruding portion 22, so that the folding of the diaphragm 20 is not likely to cause the pole piece 10 to be exposed.

[0161] Referring to Figure 8, in some embodiments, in the length direction X of the pole piece 10, the connecting portion 31 can completely cover the pole tab area 12, or can cover part 21 of the pole tab area 12. When the connecting portion 31 completely covers the pole tab area 12 or covers part 21 of the pole tab area 12, the bonding force between the protruding portion 22 and the pole tab area 12 should be greater than 1 Newton (N) to reduce the occurrence of the protruding portion 22 collapsing at the pole tab area 12.

[0162] In the longitudinal direction X of the electrode piece 10 , the coupling portion 31 may not cover the tab region 12 , that is, the tab region 12 is disposed in the spacing space 32 between two adjacent coupling portions 31 .

[0163] This embodiment provides a relationship between the tab area 12 and the joint 31. In the length direction X of the pole piece 10, the joint 31 can completely cover the tab area 12 or the covering portion 21 can divide the tab area 12. The joint 31 can also completely not cover the tab area 12, that is, the tab area 12 is arranged in the opening between the two joints 31, so that the setting of the joint 31 does not affect the function of the tab area 12.

[0164] In some embodiments, in the width direction of the pole piece 10, the ratio of the size of the protruding portion 22 to the size of the pole tab area 12 ranges from 1:3 to 2:3. Specifically, the ratio of the size of the protruding portion 22 to the size of the pole tab area 12 can be 1:3, 1:2, 1:3, or other values.

[0165] Because the protruding portion 22 should have a certain size in the width direction Y of the electrode piece 10, so that the joint 31 formed by the protruding portion 22 has a certain stability and reduces the occurrence of the joint 31 breaking, the tab area 12 should also have a certain length so that the portion of the tab area 12 extending outside the diaphragm 20 can be stably connected to the electrode terminal. Accordingly, a ratio range of the size of the protruding portion 22 to the size of the tab area 12 is set to ensure that the joint 31 has high stability and is not easy to break, and the tab area 12 can be more stably connected to the electrode terminal.

[0166] This embodiment provides a relationship between the tab area 12 and the protruding portion 22 . The protruding portion 22 has a strong adhesive force within this size range and can also reduce the influence of the diaphragm 20 on the connection between the tab area 12 and other structures.

[0167] In some embodiments, in the width direction of the pole piece 10 , the difference between the size of the tab region 12 and the size of the protruding portion 22 ranges from 1 mm to 40 mm.

[0168] The difference between the size of the tab area 12 in the width direction Y and the size of the protruding portion 22 in the width direction Y refers to the size of the portion of the tab area 12 extending outside the diaphragm 20 in the width direction Y. The specific size of the portion of the tab area 12 extending outside the diaphragm 20 in the width direction Y can be 1mm, 5mm, 10mm, 15mm, 20mm, 25mm, 30mm, 40mm or other values.

[0169] Since the portion of the tab area 12 extending beyond the diaphragm 20 is mainly used to connect to the electrode terminal, when the size of the portion of the tab area 12 extending beyond the diaphragm 20 is within the range of 1 mm to 40 mm, the diaphragm 20 can be more stably connected to the electrode terminal and is not prone to being too long to cause negative impacts on energy density, cost, etc.

[0170] This embodiment provides a size range for the tab region 12 to extend beyond the diaphragm 20 , so as to facilitate connection of the tab region 12 with other structures and reduce the negative impact of the diaphragm 20 on the connection stability of the tab region 12 .

[0171] According to some embodiments of the present application, referring to FIG. 9 to FIG. 13 , FIG. 9 to FIG. 13 are schematic structural diagrams of different connection patterns 311 in the electrode assembly 100 provided in some embodiments of the present application.

[0172] In some embodiments of the present application, a connection pattern 311 is formed on the joining portion 31 , and the protruding portions 22 on opposite sides of the electrode piece 10 are connected at the connection pattern 311 .

[0173] The connection pattern 311 refers to a pattern formed by connecting two protruding portions 22. For example, the connection pattern 311 can be a pattern formed by a weld mark obtained by welding the two connection portions, or a pattern formed by an embossing obtained by rolling the two protruding portions 22, or a pattern formed by a glue mark obtained by bonding the two protruding portions 22. The connection pattern 311 is not limited to weld marks, embossing, etc., and can also be a pattern formed by other connection methods.

[0174] The connection pattern 311 is used to connect at least a portion of the two protruding portions 22 to form a connecting portion 31 , so that the connecting portion 31 has greater stability and is not easily broken.

[0175] The connection pattern 311 may be in a straight line, a dot or a curve shape. The connection pattern 311 may also be in a rectangular, circular or triangular shape. The connection pattern 311 may also be in an S shape, a V shape or other shapes.

[0176] According to the arrangement of the connecting portion 31, when the size of the connecting portion 31 in the length direction X of the pole piece 10 is equal to the size of the exceeding portion 22 in the length direction X of the pole piece 10, the connecting pattern 311 can be a continuous pattern and the size in the length direction X of the pole piece 10 is equal to the size of the connecting portion 31 in the length direction X of the pole piece 10; the size of the connecting pattern 311 in the length direction X of the pole piece 10 can also be smaller than the size of the connecting portion 31 in the length direction X of the pole piece 10, so that a plurality of connecting patterns 311 can be provided and arranged at intervals along the length direction X of the pole piece 10.

[0177] According to the arrangement of the coupling portions 31 , when the coupling portions 31 are spaced apart in the length direction X of the electrode 10 , each coupling portion 31 is provided with at least one connection pattern 311 , so that the coupling portions 31 have greater stability.

[0178] This embodiment provides some ways of connecting the protruding portions 22, so that the two protruding portions 22 are connected through the connecting pattern 311 and combined to form a connecting portion 31. This arrangement can make the protruding portions 22 have greater stability at the connecting pattern 311, and make the protruding portions 22 less likely to be detached at the connecting pattern 311 due to external influences, thereby reducing the risk of short circuits and other risks that may be caused by the pole piece 10 being exposed to the outside world.

[0179] 9 and 13 , in some embodiments, the connection pattern 311 includes a curved pattern or a broken line pattern.

[0180] The curved pattern may be an S-shaped pattern or a pattern of other shapes, and the broken line pattern may be a Z-shaped pattern or a pattern of other shapes.

[0181] Referring to Figure 9, the size of the curved or broken line connection pattern 311 in the length direction X of the pole piece 10 can be the same as the size of the protruding portion 22 in the length direction X of the pole piece 10. At this time, the connecting portion 31 completely closes the corresponding side of the accommodating space; referring to Figure 13, the size of the curved or broken line connection pattern 311 in the length direction X of the pole piece 10 can also be smaller than the size of the protruding portion 22 in the length direction X of the pole piece 10. At this time, there can be multiple connection patterns 311 and they are spaced apart along the length direction X of the pole piece 10. Accordingly, the connecting portions 31 are also spaced apart to form an interval space 32.

[0182] When the direction of force applied to the protruding portion 22 at the connecting pattern 311 is consistent with the extension direction of the connecting pattern 311, the protruding portions 22 are more likely to detach from or collapse from each other. When the direction of force applied to the protruding portion 22 at the connecting pattern 311 is different from the extension direction of the connecting pattern 311, the connecting pattern 311 can better connect the two protruding portions 22.

[0183] Accordingly, this embodiment provides some shapes of the connection pattern 311, so that the connection pattern 311 is curved or folded, that is, the connection pattern 311 has multiple different extension directions. Since the direction of the external force applied to the protruding portion 22 is usually relatively single and difficult to be consistent with the shape of the connection pattern 311, this setting can enhance the connection ability of the connection pattern 311 and improve the stability of the joint 31; it can be understood that the connection pattern 311 can also include an A-shaped pattern, a flower-shaped pattern or other patterns.

[0184] Referring to Figure 10, in some embodiments, the connection pattern 311 may include a circular pattern, in which case multiple circular patterns are arranged at intervals along the length direction X of the pole piece 10. Correspondingly, the connecting portions 31 are also arranged at intervals along the length direction X of the pole piece 10, and a spacing space 32 is formed between two adjacent connecting portions 31.

[0185] 11 , in other embodiments, the connection pattern 311 may also include a continuous trapezoidal pattern. In this case, a plurality of trapezoidal patterns are sequentially arranged along the length direction X of the pole piece 10 and connected at the corners. This time, the joint 31 can close the corresponding side of the accommodating space.

[0186] Referring to Figure 12, in some other embodiments, the connection pattern 311 may include a triangular pattern, in which case multiple triangular patterns are arranged at intervals along the length direction X of the pole piece 10. Correspondingly, the connecting portions 31 are also arranged at intervals along the length direction X of the pole piece 10, and a spacing space 32 is formed between two adjacent connecting portions 31.

[0187] 14 and 15 , in some embodiments, the joint 31 may also be formed by secondary compounding. For example, the two protruding portions 22 are compounded for the first time to form the joint 31 . At this time, the joint 31 completely closes the corresponding side of the accommodating space.

[0188] After the first compounding, a second compounding is performed at the joint 31, and a connection pattern 311 is formed on the joint 31. The connection pattern 311 can be straight, dotted or curved. The connection pattern 311 can also be rectangular, circular or triangular. The connection pattern 311 can also be S-shaped, V-shaped or other shapes.

[0189] The secondary composite can further enhance the stability of the joint 31 and reduce the occurrence of the joint 31 breaking apart, thereby better reducing the exposure of the pole piece 10 to the outside world, thereby reducing the occurrence of the pole piece 10 contacting another adjacent pole piece 10 and causing a short circuit.

[0190] Referring to Figure 14, after the first compounding, the second compounding forms a circular pattern on the bonding portion 31. Compared with the design of directly forming the connection pattern 311, this setting can further enhance the stability of the bonding portion 31; referring to Figure 15, after the first compounding, the second compounding forms an S-shaped pattern on the bonding portion 31. Compared with the design of forming a circular pattern on the bonding portion 31 by the second compounding, this setting can further enhance the stability of the bonding portion 31.

[0191] According to some embodiments of the present application, the electrode sheet 10 is a positive electrode sheet and / or a negative electrode sheet, that is, in the electrode assembly 100, the positive electrode sheet can be covered by the diaphragm 20 and the joint portion 31, and the negative electrode sheet can also be covered by the diaphragm 20 and the joint portion 31, so as to reduce the exposure of the electrode sheet 10 due to the folding of the diaphragm 20, thereby reducing the short circuit caused by the contact between the electrode sheet 10 and another adjacent electrode sheet 10.

[0192] In the electrode assembly 100, both the positive electrode sheet and the negative electrode sheet can be covered by the diaphragm 20 and the joint 31, so as to better protect the positive electrode sheet and the negative electrode sheet, further reduce the exposure of the electrode sheet 10 due to the folding of the diaphragm 20, and reduce the short circuit caused by the contact between the electrode sheet 10 and another adjacent electrode sheet 10.

[0193] In this embodiment, the structure of the separator 20 and the joint 31 can be applied to either the positive electrode sheet or the negative electrode sheet, or to both the positive electrode sheet and the negative electrode sheet, so as to further reduce the risk of short circuit caused by the folding of the separator 20.

[0194] In the second aspect, referring to Figures 3, 17, and 18, some embodiments of the present application further provide a battery cell 200, comprising the electrode assembly 100 provided in some embodiments of the first aspect. Referring to Figure 3, the battery cell 200 comprises an end cap 50, a housing 40, an electrode assembly 100, and other functional components.

[0195] The end cap 50 is a component that covers the opening of the housing 40 to isolate the internal environment of the battery cell 200 from the external environment. The housing 40 is a component used to cooperate with the end cap 50 to form an internal environment for the battery cell 200, wherein the formed internal environment can be used to accommodate the electrode assembly 100, electrolyte, and other components.

[0196] The shell 40 can be a square shell. In this case, the battery cell 200 is a square shell battery cell. There can be at least two tab areas 12 that are arranged at intervals on one side of the pole piece body 11 along the length direction X of the pole piece 10, or there can be only one tab area 12 and its length is the same as that of the pole piece body 11.

[0197] The shell 40 may also be a cylindrical shell. In this case, the battery cell 200 is a cylindrical battery cell. There may be only one tab area 12 and its length is the same as that of the pole piece body 11 .

[0198] In the battery cell 200 , there may be one, two, or more electrode assemblies 100 .

[0199] In the third aspect, referring to FIG. 2 and FIG. 19 , some embodiments of the present application further provide a battery 300 , including the electrode assembly 100 provided by some embodiments of the first aspect, or the battery cell 200 provided by some embodiments of the second aspect.

[0200] 2 , the battery 300 includes a housing 60 and a battery cell 200, wherein the battery cell 200 is accommodated in the housing 60. The housing 60 is used to provide a space for accommodating the battery cell 200, and the housing 60 can adopt various structures, for example, the housing 60 can be cylindrical, rectangular, or other shapes.

[0201] In the battery 300 , the battery cell 200 may be a square-shell battery cell or a cylindrical battery cell; there may be multiple battery cells 200 , and the multiple battery cells 200 may be connected in series, in parallel, or in mixed connection.

[0202] In a fourth aspect, some embodiments of the present application further provide an electrical device 400, comprising the electrode assembly 100 provided by some embodiments of the first aspect, or the battery cell 200 provided by some embodiments of the second aspect, or the battery 300 provided by some embodiments of the third aspect.

[0203] The electric device 400 may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery-powered vehicle, an electric car, a ship, a spacecraft, etc. The electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc. The spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0204] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present application, and should all be included in the scope of protection of the present application.

Claims

1. An electrode assembly, characterized in that: include: A pole piece, including a pole piece body and a pole ear area; A diaphragm is arranged on two opposite sides of the pole piece along the thickness direction of the pole piece, the diaphragm comprises a covering portion covering the pole piece body and a protruding portion connected to the covering portion, the protruding portion covers a portion of the pole ear area; The protruding portions on opposite sides of the pole piece are at least partially connected to each other to form a joint portion, or the protruding portions on opposite sides of the pole piece are at least partially connected to the pole lug region to form the joint portion.

2. The electrode assembly according to claim 1, characterized in that: In the width direction of the pole piece, the protruding portions are provided on both sides of the covering portion, and the combining portions are provided on both opposite sides of the pole piece.

3. The electrode assembly according to claim 1 or 2, characterized in that: In the width direction of the pole piece, the size of the combined portion is smaller than or equal to the size of the protruding portion.

4. The electrode assembly according to claim 3, characterized in that: In the width direction of the pole piece, the size of the protruding portion ranges from 2 mm to 20 mm.

5. The electrode assembly according to claim 3 or 4, characterized in that: In the width direction of the pole piece, the size of the joint portion ranges from 2 mm to 20 mm.

6. The electrode assembly according to any one of claims 1 to 5, characterized in that: The covering portion is in contact with the pole piece, or there is a gap between the covering portion and the pole piece.

7. The electrode assembly according to claim 6, characterized in that: The air permeability of the covering portion ranges from 100 s / cc to 300 s / cc.

8. The electrode assembly according to any one of claims 1 to 7, characterized in that: In the length direction of the pole piece, the size of the combined portion is smaller than or equal to the size of the protruding portion.

9. The electrode assembly according to claim 8, characterized in that: One side of the pole piece is provided with at least two said combining parts which are arranged at intervals along the length direction of the pole piece, and a spacing space is formed between the two combining parts; In the thickness direction of the pole piece, the spacing space is also formed between the two protruding portions on both sides of the pole piece.

10. The electrode assembly according to claim 9, characterized in that: In the length direction of the pole piece, the size of the joint portion is greater than or equal to 2 mm, and the size of the spacing space ranges from 2 mm to 100 mm.

11. The electrode assembly according to any one of claims 1 to 10, characterized in that: At least two pole lug areas are provided on one side of the pole piece body, and at least two pole lug areas are arranged at intervals along the length direction of the pole piece.

12. The electrode assembly according to any one of claims 1 to 10, characterized in that: In the length direction of the pole piece, the length of the pole ear area is the same as the length of the pole piece body.

13. The electrode assembly according to claim 11 or 12, characterized in that: In the width direction of the pole piece, the ratio of the size of the protruding portion to the size of the pole ear region is in the range of 1:3 to 2:

3.

14. The electrode assembly according to any one of claims 11 to 13, characterized in that: In the width direction of the pole piece, the difference between the size of the pole ear area and the size of the protruding portion ranges from 1 mm to 40 mm.

15. The electrode assembly according to any one of claims 1 to 14, characterized in that: A connection pattern is formed on the combining portion, and the protruding portions on opposite sides of the pole piece are connected at the connection pattern.

16. The electrode assembly according to claim 15, characterized in that The connection pattern includes a curved pattern or a broken line pattern.

17. The electrode assembly according to any one of claims 1 to 16, characterized in that: It is characterized in that The electrode sheet is a positive electrode sheet and / or a negative electrode sheet.

18. A battery cell, characterized in that: Comprising the electrode assembly as described in any one of claims 1-17.

19. A battery, characterized in that: Comprising the electrode assembly as described in any one of claims 1 to 17; or the battery cell as described in claim 18.

20. An electrical device, characterized in that: The invention comprises the electrode assembly as claimed in any one of claims 1 to 17; or the battery cell as claimed in claim 18; or the battery as claimed in claim 19.

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