Battery cell, battery device, electrical device and energy storage device

Abstract

Provided in the embodiments of the present application are a battery cell, a battery device, an electrical device and an energy storage device. The battery cell comprises a casing, a first electrode lead-out component and an electrode assembly. The casing comprises a first wall; the first electrode lead-out component is disposed on the first wall; the electrode assembly is disposed in the casing and comprises an electrode body and a first tab extending from the electrode body, and the first tab comprises a plurality of stacked first tab pieces; the first tab comprises a first section and a second section, wherein the first section is connected to the first electrode lead-out component by means of a first weld, and the second section is connected to the first section and the electrode body; and the second section is provided with a binding portion, and at least some of the plurality of first tab pieces are connected to each other by means of the binding portion. The present application can improve the reliability of the battery cell.

Description

Battery cells, battery packs, electrical devices and energy storage devices Technical Field

[0001] This application relates to the field of battery device technology, and more specifically, to a battery cell, a battery device, an electrical device, and an energy storage device. Background Technology

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of this sustainable development. For electric vehicles, battery technology is a crucial factor in their development.

[0003] In the manufacturing process of battery devices, the reliability of the battery device is a crucial issue. Therefore, improving the reliability of battery devices is a pressing technical problem that needs to be solved. Summary of the Invention

[0004] This application provides a battery cell, a battery device, an electrical device, and an energy storage device, which can improve the reliability of the battery cell.

[0005] This application is achieved through the following technical solution:

[0006] In a first aspect, embodiments of this application provide a battery cell, which includes a casing, a first electrode lead-out component, and an electrode assembly. The casing includes a first wall; the first electrode lead-out component is disposed on the first wall; the electrode assembly is disposed within the casing, and the electrode assembly includes an electrode body and a first tab extending from the electrode body. The first tab includes a plurality of first tab pieces stacked together; the first tab includes a first segment and a second segment, the first segment being connected to the first electrode lead-out component via a first solder joint, and the second segment connecting the first segment and the electrode body; wherein the second segment is provided with a binding portion, and at least some of the plurality of first tab pieces are interconnected via the binding portion.

[0007] According to the battery cell of this application embodiment, at least some of the first electrode tabs are connected by a binding portion, which can constrain the first electrode tabs from folding, reduce the risk of short circuit between positive and negative electrodes caused by the insertion of the first electrode tabs into the electrode body, thereby improving the reliability of the battery cell; at the same time, using the battery cell of this application, the size of the first electrode tab protruding from the electrode body along the extension direction of the first electrode tab can be reduced, thereby reducing the risk of the first electrode tab folding during transportation, which facilitates the improvement of the production yield and production efficiency of the battery cell; after the size of the first electrode tab protruding from the electrode body is reduced, the multiple first electrode tabs The plates are arranged in a stepped pattern. When multiple first electrode tabs are connected to the first electrode lead-out component, the binding part is closer to the electrode body relative to the first solder mark along the extension direction of the first electrode tab. Even if the ends of some first electrode tabs are not connected to the first electrode lead-out component, the binding part connects at least some of the first electrode tabs. The binding part can also constrain at least some of the first electrode tabs that are not connected to the first electrode lead-out component to fold over, so as to reduce the risk of short circuit between positive and negative electrodes caused by the insertion of the first electrode tabs into the electrode body. Therefore, the battery cell can also achieve high production yield and production efficiency.

[0008] According to some embodiments of this application, on the same projection plane perpendicular to the thickness direction of the first wall, the orthographic projection of the binding portion does not overlap with the orthographic projection of the first electrode lead-out component.

[0009] By setting the orthographic projection of the binding part to not overlap with the orthographic projection of the first electrode lead-out component, the risk of interference between the binding part and the connection between the first electrode tab and the first electrode lead-out component can be reduced, making it easier to connect the first electrode tab and the first electrode lead-out component, so that the first electrode tab and the first electrode lead-out component have better connection reliability.

[0010] According to some embodiments of this application, the number of first electrode tabs interconnected by the binding portion is greater than the number of first electrode tabs interconnected by the first solder mark.

[0011] The number of first electrode tabs connected to each other by the binding part is greater than the number of first electrode tabs connected to each other by the first solder mark. Some of the first electrode tabs are not connected to the first electrode lead-out component by the first solder mark. The size of the first electrode tabs protruding from the electrode body is designed to be small, which can reduce the risk of the first electrode tabs being flipped during transportation and facilitate the improvement of the production yield and production efficiency of battery cells.

[0012] According to some embodiments of this application, the second segment includes a root, a bend, and a connecting portion. The root is connected to the electrode body, the bend connects the root and the connecting portion, and the connecting portion is connected to the first segment. A plurality of first electrode tabs are gathered in the bend; a binding portion is disposed in the connecting portion.

[0013] The binding part is located in the area of ​​the second section away from the electrode body. By setting the binding part in the connecting part, the binding part can restrain the end of the first electrode tab away from the electrode body, which helps to reduce the risk of the end of the first electrode tab away from the electrode body being folded and inserted into the electrode body.

[0014] According to some embodiments of this application, the first electrode tab includes a plurality of binding portions, which are spaced apart along the extension direction of the first electrode tab.

[0015] By arranging multiple binding parts at intervals along the extension direction of the first electrode tab, the first electrode tab can be constrained at multiple positions in the extension direction of the first electrode tab, thereby improving the binding effect on the first electrode tab and reducing the risk of the end of the first electrode tab away from the electrode body being folded over and inserted into the electrode body.

[0016] According to some embodiments of this application, there are two binding portions, namely a first binding portion and a second binding portion, wherein the first binding portion is closer to the bending portion than the second binding portion.

[0017] By placing the first binding part closer to the bending part than the second binding part, since the bending part is the gathering part of multiple first electrode tabs, the first binding part connects the part of the first electrode tab near the bending part. The first binding part can bind more first electrode tabs, which is conducive to the interconnection of multiple first electrode tabs. The first electrode tab has a high current carrying capacity.

[0018] According to some embodiments of this application, the number of first electrode tabs interconnected by the first binding portion is greater than the number of first electrode tabs interconnected by the second binding portion.

[0019] In the above scheme, the first binding part connects a larger number of first electrode tabs. For example, the first binding part can connect all the first electrode tabs to facilitate binding of multiple first electrode tabs. The number of first electrode tabs connected to the second binding part is less than the number of first electrode tabs connected to the first binding part. The size of the first electrode tabs protruding from the electrode body along the extension direction of the first electrode tab can be designed to be smaller to reduce the risk of the first electrode tabs folding during transportation, thereby improving the production yield and efficiency of the battery cell. At the same time, since the number of first electrode tabs connected to the second binding part is less than the number of first electrode tabs connected to the first binding part, it means that some first electrode tabs are not connected by the second binding part. Multiple first electrode tabs are distributed in a stepped manner at the connection part. The second binding part can connect the ends of some first electrode tabs that are away from the electrode body, thereby reducing the risk of the ends of multiple first electrode tabs that are away from the electrode body folding over and inserting into the electrode body.

[0020] According to some embodiments of this application, all the first electrode tabs in the first electrode tab are interconnected by a first binding portion.

[0021] In the above scheme, all the first electrode tabs are interconnected through the first binding part, so that the first electrode tabs have a high current carrying capacity at the location of the first binding part, which facilitates the transmission of current; at the same time, the first binding part connects all the first electrode tabs, which can effectively constrain the first electrode tabs from folding, reducing the risk of short circuit between positive and negative electrodes caused by the insertion of the first electrode tabs into the electrode body.

[0022] According to some embodiments of this application, the number of first electrode tabs interconnected by the second binding portion is greater than the number of first electrode tabs interconnected by the first solder joint.

[0023] In the above scheme, the size of the multiple first electrode tabs protruding from the electrode body along the extension direction of the first electrode tab is small, the number of first electrode tabs connected by the first solder is less than the number of first electrode tabs connected by the second binding part, the second binding part is closer to the first solder than the first binding part, and at least part of the multiple first electrode tabs are connected by the second binding part, which can constrain the end of the multiple first electrode tabs away from the electrode body to fold over, so as to reduce the risk of the end of the first electrode tab away from the electrode body folding over and being inserted into the electrode body.

[0024] According to some embodiments of this application, along the thickness direction of the first wall, the first binding portion is closer to the first wall than the second binding portion.

[0025] In the above scheme, the first binding part is closer to the first wall than the second binding part, so that the electrode body can be set close to the first wall, which can make reasonable use of the space inside the battery cell in the thickness direction of the first wall, so that the battery cell has a high energy density.

[0026] According to some embodiments of this application, along a first direction, a first binding portion is disposed on the side of the first electrode lead-out component. On the same projection plane perpendicular to the first direction, the orthographic projection of the first binding portion at least partially overlaps with the orthographic projection of the first electrode lead-out component. The first direction is perpendicular to the thickness direction of the first wall.

[0027] In the above scheme, the first binding part is disposed on the side of the first electrode lead-out component, and the first binding part overlaps at least partially with the first electrode lead-out component along the first direction, so that the first electrode lead-out component can be disposed toward the inside of the battery cell, which can reduce the size of the battery cell in the thickness direction of the first wall, so that the battery cell can have a higher energy density.

[0028] According to some embodiments of this application, the first electrode lead-out component includes a first electrode terminal, and the first segment is connected to the first electrode terminal by a first solder mark.

[0029] In the above scheme, the first electrode terminal is connected to the first segment by the first solder mark, which helps to reduce the number of components inside the battery cell, reduce manufacturing costs, and improve the utilization rate of the internal space of the battery cell.

[0030] According to some embodiments of this application, the battery cell further includes a first insulating member disposed between the first wall and the electrode assembly; the first insulating member has a protrusion on the side facing the electrode body, and the protrusion surrounds the first electrode terminal.

[0031] By placing the first insulating member between the first wall and the electrode assembly, the first wall and the electrode assembly can be insulated and separated; by surrounding the first electrode terminal with the protrusion, the electrode terminal can be assembled and positioned, and the electrode terminal and the first wall can be insulated and separated.

[0032] According to some embodiments of this application, on the same projection plane perpendicular to the thickness direction of the first wall, the orthographic projection of the second binding portion and the orthographic projection of the protrusion at least partially overlap.

[0033] In the above scheme, along the thickness direction of the first wall, the second binding part and the protrusion at least partially overlap. The protrusion can constrain the second binding part to move toward the first wall. The first electrode ear has high overall strength at the second binding part, which can reduce the risk of the protrusion damaging the first electrode ear and facilitate the bending of the first electrode ear near the protrusion.

[0034] According to some embodiments of this application, the first electrode terminal has a first surface facing the electrode body; the first surface extends beyond the protrusion along the direction of the first wall pointing towards the electrode body; the first segment is connected to the first surface by a first solder mark.

[0035] In the above scheme, the first surface extends beyond the protrusion so that the first electrode terminal is larger in size inside the battery cell, and the overall size of the battery cell in the thickness direction of the first wall can be designed to be smaller in order to improve the energy density of the battery cell; the first segment and the first surface are connected by the first solder mark so as to realize the assembly of the first electrode terminal and the first tab.

[0036] According to some embodiments of this application, the binding portion is a second solder mark.

[0037] In the above scheme, multiple first electrode tabs are connected by a second solder mark, so that the multiple first electrode tabs have good connection reliability and overcurrent capacity, which facilitates the transmission of electrical energy.

[0038] According to some embodiments of this application, the binding part is an adhesive.

[0039] In the above scheme, the binding part is an adhesive to ensure that the multiple first pole lugs have good connection reliability.

[0040] According to some embodiments of this application, the adhesive contains conductive particles.

[0041] In the above scheme, the adhesive contains conductive particles to enable good current flow between multiple first electrode tabs.

[0042] According to some embodiments of this application, the number of first electrode tabs in the first electrode tab is N, and the number of first electrode tabs interconnected by the first solder mark is M, satisfying 1 / 2≤M / N<1.

[0043] In the above scheme, the ratio of the number of first electrode tabs interconnected by the first solder mark to the number of first electrode tabs in the first electrode tab is greater than or equal to 1 / 2 and less than 1. On the one hand, the length of the first electrode tab extending out of the electrode body can be shorter to reduce the risk of the first electrode tab turning over during transportation. On the other hand, the number of connections between the first electrode tab and the first electrode lead-out component is large, so that the first electrode tab and the first electrode lead-out component have a high current carrying capacity.

[0044] According to some embodiments of this application, 3 / 5 ≤ M / N ≤ 4 / 5.

[0045] When M / N≥3 / 5, the number of connections between the first electrode tab and the first electrode lead-out component is increased, so that the first electrode tab and the first electrode lead-out component have a higher current carrying capacity; when M / N≤4 / 5, the length of the first electrode tab extending out of the electrode body can be shorter, so as to reduce the risk of the first electrode tab folding during transportation.

[0046] According to some embodiments of this application, the electrode body includes a flat region, and the electrode sheets in the flat region are stacked along a first direction, which is perpendicular to the thickness direction of the first wall; along the first direction, the size of the battery cell is less than or equal to 90 mm.

[0047] In the above scheme, the electrode sheets in the flat region are stacked along the first direction, which can be parallel to the thickness direction of the battery cell; the size of the battery cell along the first direction is less than or equal to 90mm, the battery cell has a compact structure in the first direction, and the battery device composed of the battery cells can have more battery cells in the first direction, which is conducive to improving the energy density of the battery device.

[0048] According to some embodiments of this application, the size of a single battery cell is less than or equal to 85 mm along a first direction.

[0049] When the size of a single battery cell along the first direction is less than or equal to 85 mm, the structure of the battery cell in the first direction is further made compact. The battery device composed of such battery cells can have more battery cells in the first direction, which is conducive to improving the energy density of the battery device.

[0050] According to some embodiments of this application, the electrode assembly includes a first electrode plate, the first electrode plate includes a first body portion and a first electrode tab, the first electrode tab extends from a first edge of the first body portion, and when the first electrode tab is unfolded, the size of the first electrode tab protruding from the first edge is less than or equal to 25 mm.

[0051] In the above scheme, the first electrode tab protrudes from the first edge by less than or equal to 25mm. The first electrode tab has a small size in its extension direction, which can reduce the risk of the first electrode tab being folded during transportation and facilitate the improvement of the production yield and production efficiency of the battery cell.

[0052] According to some embodiments of this application, when the first electrode tab is unfolded, the dimension of the first electrode tab protruding from the first edge is less than or equal to 22 mm.

[0053] In the above scheme, when the size of the first electrode tab protruding from the first edge is less than or equal to 22mm, the first electrode tab is further made to have a smaller size in its extension direction, which can reduce the risk of the first electrode tab being folded during transportation, so as to improve the reliability of the battery cell.

[0054] Secondly, embodiments of this application also provide a battery device, which includes a battery cell provided according to any of the above embodiments.

[0055] Thirdly, embodiments of this application also provide an electrical device, which includes a battery cell or battery device provided according to any of the above embodiments, wherein the battery cell or battery device is used to provide electrical energy.

[0056] Fourthly, embodiments of this application also provide an energy storage device, which includes a battery cell or battery device provided according to any of the above embodiments, wherein the battery cell or battery device is used to store electrical energy and is capable of providing electrical energy.

[0057] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0058] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0059] Figure 1 is a structural schematic diagram of a vehicle provided in some embodiments of this application;

[0060] Figure 2 is an exploded view of the structure of a battery device provided in some embodiments of this application;

[0061] Figure 3 is an exploded view of the structure of a battery cell 20 provided in some embodiments of this application;

[0062] Figure 4 is a cross-sectional view of a battery cell provided in some embodiments of this application;

[0063] Figure 5 is a magnified view of part A in Figure 4;

[0064] Figure 6 is a schematic diagram of the structure of the first electrode provided in some embodiments of this application;

[0065] Figure 7 is a schematic diagram of the structure of the first electrode provided in some embodiments of this application.

[0066] The accompanying drawings are not drawn to scale.

[0067] Marking Explanation: 100 - Battery assembly; 10 - Housing; 11 - First sub-housing; 12 - Second sub-housing; 20 - Battery cell; 21 - Outer casing; 211 - Housing; 212 - End cap; 213 - First wall; 22 - Electrode assembly; 22a - First electrode; 221a - First main body; 221b - First edge; 221 - Electrode body; 2210 - Straight area; 222 - First tab; 2220 - First tab piece; 222a - First section; 222b - Second section; 2221 - Root; 2222 - Bending section; 2223 - Connecting part; 223- Binding part; 2231- First binding part; 2232- Second binding part; 224- Second electrode tab; 23- First electrode lead-out component; 231- First electrode terminal; 2311- First surface; 24- First insulating component; 241- Protrusion; 242- Insulating component body; 243- Second surface; 25- Second electrode lead-out component; 26- Second insulating component; 31- First solder mark; 200- Controller; 300- Motor; 1000- Vehicle; X- First direction; Y- Second direction; Z- Thickness direction of the first wall. Detailed Implementation

[0068] The embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to illustrate the principles of this application by way of example, but should not be used to limit the scope of this application, that is, this application is not limited to the described embodiments.

[0069] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having" and any variations thereof in the description, claims and foregoing drawings of this application are intended to cover non-exclusive inclusion.

[0070] The terms "first," "second," etc., in the specification, claims, or the accompanying drawings of this application are used to distinguish different objects, rather than to describe a specific order or primary / secondary relationship.

[0071] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0072] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0073] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0074] In this application, "multiple" refers to two or more (including two), and similarly, "multiple groups" refers to two or more (including two), and "multiple pieces" refers to two or more (including two).

[0075] The battery device mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells, which are connected in series, parallel, or mixed connections via a busbar.

[0076] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells; as an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells into a single module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0077] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cell assemblies housed within the housing.

[0078] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0079] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0080] As an example, the enclosure may include a first sub-enclosure and a second sub-enclosure. The first and second sub-enclosures are interlocked to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or shutting down; it can be sealed or not sealed. The first sub-enclosure may be a top cover or a bottom plate.

[0081] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0082] As an example, the housing can be part of the vehicle's chassis structure. For instance, the housing's roof can be at least part of the vehicle's floor, or the housing's frame can be at least part of the vehicle's crossbeams and longitudinal beams.

[0083] In some embodiments, the energy storage device includes an energy storage enclosure and a battery unit, with a door on at least one side of the energy storage enclosure. The energy storage device includes energy storage containers, energy storage cabinets, etc.

[0084] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0085] The battery cell may be, but is not limited to, lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc.

[0086] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0087] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0088] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material is disposed on either or both of the two opposite surfaces of the positive current collector.

[0089] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, it can be made of stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium with a silver-plated surface. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0090] As an example, the positive electrode active material may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, this application is not limited to these materials, and other conventional materials that can be used as positive electrode active materials for batteries may also be used.

[0091] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0092] As an example, the negative electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, it can be aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, or made of carbon, nickel, or titanium, etc.

[0093] In some embodiments, the negative electrode current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0094] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in batteries. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc. Silicon-based materials may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. Tin-based materials may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, this application is not limited to these materials, and other conventional materials that can be used as negative electrode active materials for batteries may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0095] In some embodiments, the separator is a separator membrane. This application does not impose any particular limitation on the type of separator membrane; any known porous separator membrane with good chemical and mechanical stability can be selected.

[0096] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without particular limitation. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without particular limitation. The separator can be a separate component located between the positive and negative electrodes, or it can be attached to the surfaces of the positive and negative electrodes.

[0097] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

[0098] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0099] In some implementations, the electrode assembly is a stacked structure.

[0100] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as electrode assemblies and electrolytes. The housing may be made of steel, aluminum, plastic (such as polypropylene), composite metal (such as copper-aluminum composite), or aluminum-plastic film, etc.

[0101] In some embodiments, the housing includes an end cap and a casing, the casing having an opening, and the end cap closing the opening to form a sealed space for accommodating substances such as electrode assemblies and electrolytes. The casing may have one or more openings. The end cap may also be provided one or more times.

[0102] In some embodiments, at least one electrode terminal is provided on the housing, and the electrode terminal is electrically connected to the tab of the electrode assembly. The electrode terminal can be directly connected to the tab. The electrode terminal can be located on the end cap or on the housing.

[0103] In some implementations, an explosion-proof valve is provided on the housing. The explosion-proof valve is used to release the internal pressure of the battery cells.

[0104] In some embodiments, the housing can be a sealed structure or a non-sealed structure. As an example, when the housing is a sealed structure, it protects the electrode assembly and prevents leaks such as electrolyte leakage. When the housing is a non-sealed structure, it protects the electrode assembly, and a sealing bag may be included between the housing and the electrode assembly to encapsulate the electrode assembly and electrolyte. Specifically, the sealing bag can be a bag-shaped insulating material or an aluminum-plastic film.

[0105] As an example, a battery cell can be a cylindrical battery cell, a prismatic battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries.

[0106] The development of battery device technology must take into account multiple design factors, such as performance parameters like energy density, discharge capacity, and charge / discharge rate. In addition, the reliability of the battery device also needs to be considered.

[0107] In some embodiments, a battery cell includes a housing, an electrode lead-out component, and an electrode assembly. The electrode lead-out component is disposed within the housing, and the electrode assembly is disposed within the housing. The electrode assembly includes an electrode body and tabs extending from the electrode body. Each tab includes a plurality of stacked tab pieces. The plurality of tab pieces are typically electrically connected to the electrode lead-out component to facilitate the extraction or introduction of electrical energy from the electrode assembly. During battery cell assembly, to facilitate the connection of the multiple tab pieces to the electrode lead-out component, the tab pieces are typically designed to protrude significantly from the electrode body. After the multiple tab pieces are connected to the electrode lead-out component, they are bent to allow the electrode assembly to be placed within the housing. However, the tab pieces are prone to folding, and when inserted into the electrode body, this can easily lead to a short circuit between the positive and negative electrodes, affecting the reliability of the battery cell.

[0108] In view of this, in order to solve the problem of low reliability of battery cells caused by the folding and insertion of electrode tabs into the electrode body, this application provides a battery cell, which includes a housing, a first electrode lead-out component, and an electrode assembly. The housing includes a first wall; the first electrode lead-out component is disposed in the first wall; the electrode assembly is disposed inside the housing, and the electrode assembly includes an electrode body and a first electrode tab extending from the electrode body. The first electrode tab includes a plurality of first electrode tabs stacked together; the first electrode tab includes a first segment and a second segment, the first segment is connected to the first electrode lead-out component by a first solder joint, and the second segment connects the first segment and the electrode body; wherein, the second segment is provided with a binding portion, and at least some of the plurality of first electrode tabs are interconnected through the binding portion.

[0109] In the aforementioned battery cell, by connecting at least some of the first electrode tabs among multiple first electrode tabs through a binding portion, the first electrode tabs can be constrained from folding, reducing the risk of short circuit between the positive and negative electrodes caused by the insertion of the first electrode tabs into the electrode body, thereby improving the reliability of the battery cell. Simultaneously, using the battery cell of this application, the size of the first electrode tabs protruding from the electrode body along the extension direction of the first electrode tab can be reduced, thereby reducing the risk of folding of the first electrode tabs during transportation and facilitating improved production yield and efficiency of the battery cell. After the size of the first electrode tabs protruding from the electrode body is reduced, the multiple first electrode tabs are arranged in a stepped manner. With a ladder-shaped distribution, when multiple first tabs are connected to the first electrode lead-out component, the binding portion is closer to the electrode body relative to the first solder mark along the extension direction of the first tab. Even if the ends of some first tabs are not connected to the first electrode lead-out component, the binding portion connects at least some of the first tabs. The binding portion can also constrain at least some of the first tabs not connected to the first electrode lead-out component to fold over, thereby reducing the risk of short circuit between the positive and negative electrodes due to the insertion of the first tabs into the electrode body. Therefore, this battery cell can also achieve a high production yield and production efficiency.

[0110] The battery cells and battery devices disclosed in this application can be used, but are not limited to, in electrical devices such as vehicles, ships, or aircraft. A power system for such an electrical device can be constructed using the battery cells and battery devices disclosed in this application.

[0111] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use battery cells and battery devices, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles and spacecraft.

[0112] The technical solutions described in the embodiments of this application can also be applied to energy storage devices that use various battery cells and battery devices.

[0113] For ease of explanation, the following embodiments will be described using a vehicle as an example of an electrical device according to an embodiment of this application.

[0114] Please refer to Figure 1, which is a schematic diagram of the vehicle structure provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle, or a range-extended electric vehicle, etc. A battery device 100 is installed inside the vehicle 1000, and the battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000. For example, the battery device 100 can serve as the operating power source for the vehicle 1000's electrical system, such as meeting the power requirements for starting, navigation, and operation of the vehicle 1000.

[0115] The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, for the power needs of the vehicle 1000 during startup, navigation and driving.

[0116] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0117] Please refer to Figure 2, which is an exploded view of the structure of a battery device provided in some embodiments of this application. The battery device 100 includes a housing 10 and battery cells 20, with the battery cells 20 housed within the housing 10. The housing 10 provides space for the battery cells 20, and the housing 10 can adopt various structures.

[0118] In some embodiments, the housing 10 may include a first sub-housing 11 and a second sub-housing 12, which overlap each other and together define a receiving space for accommodating the battery cell 20. The second sub-housing 12 may be a hollow structure with one end open, and the first sub-housing 11 may be a plate-like structure, with the first sub-housing 11 covering the open side of the second sub-housing 12 so that the first sub-housing 11 and the second sub-housing 12 together define the receiving space; alternatively, the first sub-housing 11 and the second sub-housing 12 may both be hollow structures with one side open, with the open side of the first sub-housing 11 covering the open side of the second sub-housing 12.

[0119] In the battery device 100, there can be multiple battery cells 20, which can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 20 are connected in both series and parallel connections. Multiple battery cells 20 can be directly connected in series, parallel, or in a mixed configuration, and then the entire assembly of the multiple battery cells 20 is housed within the housing 10. Alternatively, the battery device 100 can also consist of multiple battery cells 20 first connected in series, parallel, or in a mixed configuration to form a battery cell assembly, and then these battery cell assemblies are connected in series, parallel, or in a mixed configuration to form a whole, which is then housed within the housing 10. The battery device 100 may also include other structures; for example, it may include a busbar component for electrical connection between the multiple battery cells 20.

[0120] Please refer to Figure 3, which is an exploded view of the structure of a battery cell 20 provided in some embodiments of this application. As shown in Figure 3, the battery cell 20 includes a housing 21, an electrode assembly 22, and other functional components. The housing 21 includes a shell 211 and an end cap 212. The shell 211 has an opening, and the end cap 212 closes the opening to isolate the internal environment of the battery cell 20 from the external environment.

[0121] The housing 211 is a component used to cooperate with the end cap 212 to form the internal environment of the battery cell 20, wherein the formed internal environment can accommodate the electrode assembly 22, electrolyte, and other components. The housing 211 and the end cap 212 can be independent components. The housing 211 can have various shapes and sizes. Specifically, the shape of the housing 211 can be determined according to the specific shape and size of the electrode assembly 22. The housing 211 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, and plastic.

[0122] End cap 212 refers to a component that covers the opening of housing 211 to isolate the internal environment of battery cell 20 from the external environment. The shape of end cap 212 can be adapted to the shape of housing 211 to fit it. Optionally, end cap 212 can be made of a material with certain hardness and strength (such as aluminum alloy), so that end cap 212 is not easily deformed under pressure and impact, giving battery cell 20 higher structural strength and improved reliability. Functional components such as electrode terminals and pressure relief mechanisms can be provided on end cap 212. Electrode terminals can be used for electrical connection with electrode assembly 22 to output or input electrical energy to battery cell 20. The material of end cap 212 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose special limitations on this. In some embodiments, an insulating structure may be provided on the inner side of the end cap 212. The insulating structure can be used to isolate the electrical connection components within the housing 211 from the end cap 212 to reduce the risk of short circuits. For example, the insulating structure may be made of plastic, rubber, etc.

[0123] Electrode assembly 22 is the component in the battery cell 20 where the electrochemical reaction occurs. The housing 211 may contain one or more electrode assemblies 22. The electrode assembly 22 is mainly formed by winding or stacking positive and negative electrode sheets, and typically a separator is provided between the positive and negative electrode sheets to separate them and prevent internal short circuits. The portions of the positive and negative electrode sheets containing active material constitute the electrode body of the electrode assembly 22, while the portions of the positive and negative electrode sheets without active material each constitute a tab. The positive and negative tabs may be located together at one end of the electrode body or separately at both ends of the electrode body.

[0124] Please refer to Figure 3, and further refer to Figures 4 to 6. Figure 4 is a cross-sectional view of a battery cell provided in some embodiments of this application, Figure 5 is a partial enlarged view of section A in Figure 4, and Figure 6 is a structural schematic diagram of the first electrode tab provided in some embodiments of this application. This application provides a battery cell 20, which includes a housing 21, a first electrode lead-out component 23, and an electrode assembly 22. The outer casing 21 includes a first wall 213; a first electrode lead-out component 23 is disposed on the first wall 213; an electrode assembly 22 is disposed inside the outer casing 21, the electrode assembly 22 includes an electrode body 221 and a first electrode tab 222 extending from the electrode body 221, the first electrode tab 222 includes a plurality of first electrode tab pieces 2220 stacked together; the first electrode tab 222 includes a first segment 222a and a second segment 222b, the first segment 222a is connected to the first electrode lead-out component 23 through a first solder mark 31, and the second segment 222b connects the first segment 222a and the electrode body 221; wherein, the second segment 222b is provided with a binding part 223, and at least some of the first electrode tab pieces 2220 are connected to each other through the binding part 223.

[0125] The first wall 213 can be an end cap 212 or a wall portion of the housing 211.

[0126] The first wall 213 may be provided with an electrode lead-out hole, which penetrates the first wall 213 along the thickness direction Z. A portion of the first electrode lead-out component 23 is disposed within the electrode lead-out hole. In some embodiments, the battery cell 20 further includes a second electrode lead-out component, the polarity of which is opposite to that of the first electrode lead-out component 23. The number of electrode lead-out holes may be two, with the two electrode lead-out holes corresponding to the first electrode lead-out component 23 and the second electrode lead-out component, respectively.

[0127] In some embodiments, the polarity of the first electrode lead-out component 23 can be positive, or the polarity of the first electrode lead-out component 23 can be negative.

[0128] The first tab 222 can extend from one end of the electrode body 221 near the first wall 213, so that the first tab 222 can be connected to the first electrode lead-out component 23. In the extending direction of the first tab 222, one end of the first tab 222 is connected to the electrode body 221, and the other end of the first tab 222 is away from the electrode body 221.

[0129] The first electrode tab 222 can be either a positive electrode tab or a negative electrode tab.

[0130] Multiple first electrode tabs 2220 are stacked. Along the extension direction of the first electrode tab 222, the dimensions of the multiple first electrode tabs 2220 protruding from the electrode body 221 can be equal. After the multiple first electrode tabs 2220 are gathered and bent, the ends of the multiple first electrode tabs 2220 that are away from the electrode body 221 are distributed in a stepped manner.

[0131] The first segment 222a and the second segment 222b can be two segments sequentially distributed along the extension direction of the first electrode tab 222. The first end is used to connect with the first electrode lead-out component 23, and the second segment 222b connects the first segment 222a and the electrode body 221. For example, the dashed line shown in FIG5 can be the dividing line between the first segment 222a and the second segment 222b. In some embodiments, on the same projection plane perpendicular to the thickness direction Z of the first wall, the orthographic projection of the first segment 222a can overlap with the orthographic projection of the electrode lead-out component.

[0132] When assembling the first tab 222 with the first electrode lead-out component 23, the first segment 222a and the first electrode lead-out component 23 can be welded together from the side of the first segment 222a opposite to the first electrode lead-out component 23 to form a first solder mark 31, so that the first segment 222a and the first electrode lead-out component 23 are connected by the first solder mark 31. For example, the first segment 222a and the first electrode lead-out component 23 are laser welded to form the first solder mark 31.

[0133] The restraint part 223 is a component provided in the second section 222b. The restraint part 223 is used to connect at least a portion of the plurality of first pole tabs 2220, so that the at least a portion of the first pole tabs 2220 are interconnected. After the first pole tabs 2220 are connected by the restraint part 223, the first pole tabs 2220 can be constrained from folding.

[0134] In some embodiments, the restraint portion 223 is disposed on the second segment 222b. The restraint portion 223 may be disposed close to the first solder mark 31 or close to the closing portion of the plurality of first pole tabs 2220. The placement of the restraint portion 223 is flexible.

[0135] According to the battery cell 20 of this application embodiment, at least some of the first electrode tabs 2220 are connected by a binding portion 223, which can constrain the first electrode tabs 2220 from folding, reducing the risk of short circuit between positive and negative electrodes caused by the insertion of the first electrode tabs 2220 into the electrode body 221, thereby improving the reliability of the battery cell 20. Simultaneously, using the battery cell 20 of this application, the size of the first electrode tabs 2220 protruding from the electrode body 221 along the extension direction of the first electrode tab 222 can be reduced, thereby reducing the risk of the first electrode tabs 2220 folding during transportation and facilitating improved production yield and efficiency of the battery cell 20. After the size of the first electrode tabs 2220 protruding from the electrode body 221 is reduced, the multiple first electrode tabs 2220... The first electrode tabs 2220 are arranged in a stepped manner. When multiple first electrode tabs 2220 are connected to the first electrode lead-out component 23, the binding portion 223 is closer to the electrode body 221 relative to the first solder mark 31 along the extension direction of the first electrode tabs 222. Even if the ends of some first electrode tabs 2220 are not connected to the first electrode lead-out component 23, the binding portion 223 connects at least some of the first electrode tabs 2220. The binding portion 223 can also constrain at least some of the first electrode tabs 2220 that are not connected to the first electrode lead-out component to fold over, so as to reduce the risk of short circuit between the positive and negative electrodes caused by the insertion of the first electrode tabs 2220 into the electrode body 221. Therefore, the battery cell 20 can also take into account high production yield and production efficiency.

[0136] Please refer to Figures 5 and 6. According to some embodiments of this application, on the same projection plane perpendicular to the thickness direction Z of the first wall, the orthographic projection of the binding portion 223 does not overlap with the orthographic projection of the first electrode lead-out component 23.

[0137] With the thickness direction Z of the first wall as the projection direction, the orthographic projection of the binding part 223 does not overlap with the orthographic projection of the first electrode lead-out component 23. When the battery cell 20 is assembled, the binding part 223 and the first electrode lead-out component 23 do not interfere with each other.

[0138] By setting the orthographic projection of the binding part 223 to not overlap with the orthographic projection of the first electrode lead-out component 23, the risk of interference of the binding part 223 to the connection between the first electrode tab 222 and the first electrode lead-out component 23 can be reduced, making it easier to connect the first electrode tab 222 and the first electrode lead-out component 23, so that the first electrode tab 222 and the first electrode lead-out component 23 have better connection reliability.

[0139] Referring to Figures 5 and 6, according to some embodiments of this application, the number of first electrode tabs 2220 interconnected by the binding portion 223 is greater than the number of first electrode tabs 2220 interconnected by the first solder mark 31.

[0140] After the multiple first electrode tabs 2220 are retracted, they are arranged in a stepped pattern. The binding portion 223 is closer to the connection point between the multiple first electrode tabs 2220 and the electrode body 221 than the first solder mark 31, so that the number of first electrode tabs 2220 connected by the binding portion 223 is greater than the number of first electrode tabs 2220 connected by the first solder mark 31. In this case, although some first electrode tabs 2220 are not connected to the first electrode lead-out component 23 by the first solder mark 31, the multiple first electrode tabs 2220 bound by the binding portion 223 are interconnected. Therefore, electrical energy can still be transferred between the multiple first electrode tabs 2220, and the impact on the current carrying capacity of the first electrode tab 222 is small.

[0141] The number of first electrode tabs 2220 interconnected by the binding part 223 is greater than the number of first electrode tabs 2220 interconnected by the first solder mark 31. Some of the first electrode tabs 2220 are not connected to the first electrode lead-out component 23 by the first solder mark 31. The size of the first electrode tabs 2220 protruding from the electrode body 221 is designed to be small, which can reduce the risk of the first electrode tabs 2220 being folded during transportation, and facilitate the improvement of the production yield and production efficiency of the battery cell 20.

[0142] Referring to Figures 5 and 6, according to some embodiments of this application, the second segment 222b includes a root portion 2221, a bent portion 2222, and a connecting portion 2223. The root portion 2221 is connected to the electrode body 221, the bent portion 2222 connects the root portion 2221 and the connecting portion 2223, and the connecting portion 2223 is connected to the first segment 222a. A plurality of first electrode tabs 2220 are gathered in the bent portion 2222; a binding portion 223 is disposed in the connecting portion 2223.

[0143] The root portion 2221, the bending portion 2222, and the connecting portion 2223 can be distributed sequentially along the extension direction of the first pole piece 222. Multiple first pole pieces 2220 are gathered in the bending portion 2222, and the connecting portion 2223 is bent relative to the root portion 2221 through the bending portion 2222.

[0144] After the multiple first electrode tabs 2220 are stacked, they are gathered at the bending portion 2222, thereby reducing the spacing between them. This facilitates electrical connection between the first electrode tabs 2220 and minimizes the space occupied by them. Bending the multiple first electrode tabs 2220 by the bending portion 2222 facilitates the assembly of the electrode assembly 22 with the housing 21, allowing the electrode assembly 22 to enter the housing 21.

[0145] Along the extending direction of the first tab 222, the connecting portion 2223 is far away from the root 2221 relative to the bending portion 2222. Since the multiple first tab pieces 2220 are gathered at the bending portion 2222, the gap between two adjacent first tab pieces 2220 is small at the connecting portion 2223. The binding portion 223 is provided at the connecting portion 2223, that is, the binding portion 223 connects the gathered multiple first tab pieces 2220 to facilitate the interconnection between the multiple first tab pieces 2220.

[0146] The restraint portion 223 is located in the region of the second segment 222b that is away from the electrode body 221. By providing the restraint portion 223 in the connecting portion 2223, the restraint portion 223 can constrain the end of the first electrode tab 2220 that is away from the electrode body 221, which helps to reduce the risk of the end of the first electrode tab 2220 that is away from the electrode body 221 being folded and inserted into the electrode body 221.

[0147] Referring to Figures 5 and 6, according to some embodiments of this application, the first electrode tab 222 includes a plurality of binding portions 223, which are spaced apart along the extending direction of the first electrode tab 222.

[0148] After the multiple first pole lugs 2220 are folded together, they are connected by multiple binding parts 223, which can restrain the folding of the multiple first pole lugs 2220 and facilitate the electrical connection between the multiple first pole lugs 2220. The multiple binding parts 223 can be arranged at equal intervals along the extension direction of the first pole lugs 222, which is convenient for processing and manufacturing.

[0149] By arranging multiple binding portions 223 at intervals along the extension direction of the first electrode tab 222, the first electrode tab 2220 can be constrained at multiple positions in the extension direction of the first electrode tab 222, thereby improving the binding effect on the first electrode tab 2220 and reducing the risk of the end of the first electrode tab 2220 away from the electrode body 221 being folded and inserted into the electrode body 221.

[0150] Please refer to Figures 5 and 6. According to some embodiments of this application, there are two binding portions 223. The two binding portions 223 are a first binding portion 2231 and a second binding portion 2232, respectively. The first binding portion 2231 is closer to the bending portion 2222 than the second binding portion 2232.

[0151] The first binding portion 2231 is closer to the bending portion 2222 than the second binding portion 2232, so that the first binding portion 2231, the second binding portion 2232 and the first solder mark 31 are distributed along the extension direction of the first electrode tab 222, and multiple first electrode tab pieces 2220 are interconnected at different parts of the extension direction of the first electrode tab 222.

[0152] In some embodiments, the number of first electrode tabs 2220 interconnected by the first binding portion 2231 may be greater than the number of first electrode tabs 2220 interconnected by the second binding portion 2232; or, the number of first electrode tabs 2220 interconnected by the first binding portion 2231 may be equal to the number of second electrode tabs interconnected by the second binding portion 2232.

[0153] By placing the first binding portion 2231 closer to the bending portion 2222 relative to the second binding portion 2232, since the bending portion 2222 is the convergence part of multiple first electrode tabs 2220, the first binding portion 2231 connects the part of the first electrode tab 222 close to the bending portion 2222. The first binding portion 2231 can bind more first electrode tabs 2220, which is conducive to the interconnection of multiple first electrode tabs 2220. The first electrode tab 222 has a higher current carrying capacity.

[0154] Referring to Figures 5 and 6, according to some embodiments of this application, the number of first electrode tabs 2220 interconnected by the first binding portion 2231 is greater than the number of first electrode tabs 2220 interconnected by the second binding portion 2232.

[0155] Since the first binding part 2231 is closer to the convergence part of the plurality of first pole lugs 2220 than the second binding part 2232, the first binding part 2231 can be configured to connect all the first pole lugs 2220 so as to bind all the first pole lugs 2220.

[0156] The second binding portion 2232 is far from the converged portion of the plurality of first electrode tabs 2220 relative to the first binding portion 2231. The size of the first electrode tabs 2220 protruding from the electrode body 221 is small. The plurality of first electrode tabs 2220 can be distributed in a stepped manner in the connecting portion 2223. Therefore, the number of the plurality of first electrode tabs 2220 interconnected by the second binding portion 2232 can be less than the total number of first electrode tabs 2220 in the first electrode tab 222.

[0157] In the above scheme, the first binding part 2231 connects a larger number of first electrode tabs 2220. For example, the first binding part 2231 can connect all the first electrode tabs 2220 to facilitate binding of multiple first electrode tabs 2220. The second binding part 2232 connects to a smaller number of first electrode tabs 2220 than the first binding part 2231. The size of the first electrode tabs 2220 protruding from the electrode body 221 along the extension direction of the first electrode tab 222 can be designed to be smaller to reduce the risk of the first electrode tabs 2220 folding during transportation and to improve battery performance. The production yield and efficiency of monomer 20 are improved. At the same time, since the number of first electrode tabs 2220 connected to the second binding part 2232 is less than the number of first electrode tabs 2220 connected to the first binding part 2231, it indicates that some first electrode tabs 2220 are not connected by the second binding part 2232. Multiple first electrode tabs 2220 are distributed in a stepped manner at the connecting part 2223. The second binding part 2232 can connect the ends of the first electrode tabs 2220 that are away from the electrode body 221, which helps to reduce the risk of multiple first electrode tabs 2220 folding over and inserting into the electrode body 221.

[0158] Please refer to Figures 5 and 6. According to some embodiments of this application, all the first tab pieces 2220 in the first tab 222 are interconnected by the first binding part 2231.

[0159] The bending portion 2222 is the gathering part of multiple first pole lugs 2220. All the first pole lugs 2220 are gathered in the bending portion 2222. The first binding portion 2231 is close to the bending portion 2222. Multiple first pole lugs 2220 are evenly distributed in the first binding portion 2231. All the first pole lugs 2220 are connected by the first binding portion 2231 so that the first binding portion 2231 can bind all the first pole lugs 2220 to constrain the multiple first pole lugs 2220 from folding.

[0160] In the above scheme, all the first tabs 2220 are interconnected through the first binding part 2231, so that the first tabs 222 have a high current carrying capacity at the location of the first binding part 2231, which facilitates the transmission of current; at the same time, the first binding part 2231 connects all the first tabs 2220, which can effectively constrain the first tabs 2220 from folding, reducing the risk of short circuit between positive and negative electrodes caused by the insertion of the first tabs 2220 into the electrode body 221.

[0161] Referring to Figures 5 and 6, according to some embodiments of this application, the number of first electrode tabs 2220 interconnected by the second binding portion 2232 is greater than the number of first electrode tabs 2220 interconnected by the first solder mark 31.

[0162] The number of first tabs 2220 connected to the second binding part 2232 is greater than the number of first tabs 2220 connected to the first solder mark 31, so that the multiple first tabs 2220 are distributed in a stepped manner at the first solder mark 31. The first solder mark 31 connects to a portion of the first tabs 2220 in the first tab 222, that is, the size of the first tabs 2220 protruding from the electrode body 221 along the extension direction of the first tab 222 is relatively small.

[0163] In the above scheme, the size of the multiple first electrode tabs 2220 protruding from the electrode body 221 along the extension direction of the first electrode tab 222 is small. The number of first electrode tabs 2220 connected by the first solder mark 31 is less than the number of first electrode tabs 2220 connected by the second binding part 2232. The second binding part 2232 is closer to the first solder mark 31 than the first binding part 2231. By connecting at least a portion of the multiple first electrode tabs 2220 through the second binding part 2232, the end of the multiple first electrode tabs 2220 away from the electrode body 221 can be constrained from folding, which helps to reduce the risk of the end of the first electrode tab 2220 away from the electrode body 221 folding and being inserted into the electrode body 221.

[0164] Referring to Figure 5, according to some embodiments of this application, along the thickness direction Z of the first wall, the first binding portion 2231 is closer to the first wall 213 than the second binding portion 2232.

[0165] Pointing from the electrode body 221 towards the first wall 213, the first binding portion 2231 protrudes from the second binding portion 2232. The first binding portion 2231 is closer to the first wall 213 than the second binding portion 2232, and the distance between the first binding portion 2231 and the first wall 213 is smaller than the distance between the second binding portion 2232 and the first wall 213. Since the first binding portion 2231 is closer to the bending portion 2222 than the second binding portion 2232, and the bending portion 2222 is the convergence part of the multiple first electrode tabs 2220, the bending portion 2222 occupies a large space. By setting the first binding portion 2231 to be closer to the first wall 213 than the second binding portion 2232, the distance between the bending portion 2222 and the first wall 213 can be shortened, thereby shortening the distance between the first wall 213 and the electrode body 221.

[0166] In the above scheme, the first binding part 2231 is closer to the first wall 213 than the second binding part 2232, so that the electrode body 221 can be set close to the first wall 213, which can make reasonable use of the space inside the battery cell 20 in the thickness direction Z of the first wall, so that the battery cell 20 has a higher energy density.

[0167] Referring to Figures 5 and 6, according to some embodiments of this application, along the first direction X, the first binding portion 2231 is disposed on the side of the first electrode lead-out component 23. On the same projection plane perpendicular to the first direction X, the orthographic projection of the first binding portion 2231 at least partially overlaps with the orthographic projection of the first electrode lead-out component 23. The first direction X is perpendicular to the thickness direction Z of the first wall.

[0168] In Figure 5, the direction indicated by the letter X can be a first direction. The first direction X can be parallel to the width direction of the battery cell 20, or it can be parallel to the length direction of the battery cell 20.

[0169] The side of the first electrode lead-out component 23 along the first direction X means that on the same projection plane perpendicular to the thickness direction Z of the first wall, the first electrode lead-out component 23 is located on one side of the first direction X. For example, the first electrode lead-out component 23 and the first binding part 2231 are distributed along the first direction X.

[0170] One end of the first electrode lead-out component 23 passes through the electrode lead-out hole of the first wall 213 and extends into the interior of the battery cell 20. The first electrode lead-out component 23 has a first part protruding from the inner surface of the first wall 213. Along the first direction X, the first binding part 2231 is disposed on the side of the first part.

[0171] By placing the first binding portion 2231 on the side of the first electrode lead-out component 23, and by having the first binding portion 2231 at least partially overlap with the first electrode lead-out component 23 along the first direction X, the first electrode lead-out component 23 can be disposed toward the interior of the battery cell 20, thereby reducing the size of the battery cell 20 in the thickness direction Z of the first wall, so that the battery cell 20 can have a higher energy density.

[0172] Please refer to Figures 5 and 6. According to some embodiments of this application, the first electrode lead-out component 23 includes a first electrode terminal 231, and the first segment 222a is connected to the first electrode terminal 231 through a first solder mark 31.

[0173] The first electrode terminal 231 is internally connected to the first segment 222a, and externally connected to a conductive component (such as a busbar) outside the battery cell 20, so as to facilitate the output or input of electrical energy of the electrode assembly 22.

[0174] The material of the first electrode terminal 231 can be the same as that of the first electrode tab 222, so as to facilitate the welding of the first electrode terminal 231 and the first electrode tab 222.

[0175] When assembling the first tab 222 and the first electrode terminal 231, the first segment 222a and the first electrode terminal 231 can be stacked, and the first segment 222a can be soldered on the side of the first segment 222a away from the first electrode terminal 231 to connect the first segment 222a and the first electrode terminal 231 through the first solder mark 31.

[0176] In the above scheme, the first electrode terminal 231 and the first segment 222a are connected by the first solder mark 31, so as to reduce the number of components inside the battery cell 20, reduce manufacturing costs, and improve the utilization rate of the internal space of the battery cell 20.

[0177] Referring to Figures 5 and 6, according to some embodiments of this application, the battery cell 20 further includes a first insulating member 24, which is disposed between the first wall 213 and the electrode assembly 22; the first insulating member 24 has a protrusion 241 on the side facing the electrode body 221, which surrounds the first electrode terminal 231.

[0178] The first insulating component 24 can be made of plastic, rubber, or other materials. The first insulating component 24 is an electrical insulating component, used to insulatingly separate the first wall 213 from the electrode assembly 22.

[0179] The first insulating member 24 can be disposed on the inner surface of the first wall 213. For example, the first insulating member 24 can be bonded or snapped to the inner surface of the first wall 213.

[0180] The first insulating member 24 includes an insulating member body 242 and a protrusion 241. The insulating member body 242 has a second surface 243 facing away from the first wall 213, and the protrusion 241 protrudes from the second surface 243. The second surface 243 is configured to face the electrode body 221, and the protrusion 241 is located on the side of the insulating member body 242 facing the electrode body 221. The insulating member body 242 is provided with a first through hole, which penetrates the insulating member body 242 along the thickness direction Z of the first wall, and the protrusion 241 is disposed around the first through hole. One end of the first electrode terminal 231 passes through the first through hole, such that the protrusion 241 surrounds the first electrode terminal 231.

[0181] In some embodiments, the protrusion 241 may contact the outer peripheral surface of the first electrode terminal 231, or the protrusion 241 may be spaced apart from the outer peripheral surface of the first electrode terminal 231.

[0182] When the first electrode terminal 231 is assembled with the first insulating member 24, a portion of the first electrode terminal 231 is surrounded by the protrusion 241 to facilitate the positioning of the first electrode terminal 231 and the assembly of the first electrode terminal 231.

[0183] By placing the first insulating member 24 between the first wall 213 and the electrode assembly 22, the first wall 213 and the electrode assembly 22 can be insulated and separated; by surrounding the protrusion 241 around the first electrode terminal 231, the electrode terminal can be assembled and positioned, and the electrode terminal and the first wall 213 can be insulated and separated.

[0184] Referring to Figures 5 and 6, according to some embodiments of this application, on the same projection plane perpendicular to the thickness direction Z of the first wall, the orthographic projection of the second binding portion 2232 and the orthographic projection of the protrusion 241 at least partially overlap.

[0185] Viewed along the thickness direction Z of the first wall, the second binding portion 2232 and the protrusion 241 at least partially overlap. For example, with the thickness direction Z of the first wall as the projection direction, the orthographic projection of the second binding portion 2232 partially overlaps with the orthographic projection of the protrusion 241, or the orthographic projection of the second binding portion 2232 completely overlaps with the orthographic projection of the protrusion 241.

[0186] In some embodiments, the second binding portion 2232 may contact the end face of the protrusion 241 facing the electrode body 221, and the protrusion 241 has a good limiting effect on the second binding portion 2232. In some embodiments, along the thickness direction Z of the first wall, the second binding portion 2232 may be spaced apart from the protrusion 241 to reduce the risk of interference between the second binding portion 2232 and the protrusion 241.

[0187] In the above scheme, along the thickness direction Z of the first wall, the second binding part 2232 and the protrusion 241 at least partially overlap. The protrusion 241 can constrain the second binding part 2232 to move toward the first wall 213. The first electrode ear 222 has high overall strength at the second binding part 2232, which can reduce the risk of the protrusion 241 damaging the first electrode ear 222 and facilitate the bending of the first electrode ear 222 near the protrusion 241.

[0188] Referring to Figures 5 and 6, according to some embodiments of this application, the first electrode terminal 231 has a first surface 2311 facing the electrode body 221; the first surface 2311 extends beyond the protrusion 241 along the direction of the first wall 213 pointing to the electrode body 221; the first segment 222a is connected to the first surface 2311 by a first solder mark 31.

[0189] The first surface 2311 can be the end face of the first electrode terminal 231 near the electrode body 221. The first surface 2311 can be closer to the electrode body 221 than the other surfaces of the first electrode terminal 231.

[0190] "The first surface 2311 extends beyond the protrusion 241 in the direction from the first wall 213 to the electrode body 221" means that, in the direction from the first wall 213 to the electrode body 221, the first surface 2311 is closer to the electrode body 221 than the protrusion 241, so as to facilitate the assembly of the first segment 222a with the first electrode terminal 231; at the same time, it can also reduce the risk that the protrusion 241 will affect the assembly of the first tab 222 and the first electrode terminal 231. When the first surface 2311 extends beyond the protrusion 241, the size of the first electrode terminal 231 extending into the battery cell 20 is larger, and the size of the first electrode terminal 231 outside the first wall 213 can be smaller, which can reduce the overall size of the battery cell 20 in the thickness direction Z of the first wall.

[0191] In the above scheme, the first surface 2311 extends beyond the protrusion 241, so that the first electrode terminal 231 is larger in size inside the battery cell 20, and the overall size of the battery cell 20 in the thickness direction Z of the first wall can be designed to be smaller, so as to improve the energy density of the battery cell 20; the first segment 222a is connected to the first surface 2311 through the first solder mark 31, so as to realize the assembly of the first electrode terminal 231 and the first tab 222.

[0192] According to some embodiments of this application, the restraint portion 223 is a second solder mark.

[0193] Multiple first electrode tabs 2220 are welded to form a second weld mark, which is a binding portion 223, so that the multiple first electrode tabs 2220 are interconnected through the binding portion 223. For example, multiple first electrode tabs 2220 are ultrasonically welded to form the second weld mark.

[0194] In the above scheme, multiple first electrode tabs 2220 are connected by a second solder mark, so that the multiple first electrode tabs 2220 have good connection reliability and overcurrent capacity, which facilitates the transmission of electrical energy.

[0195] According to some embodiments of this application, the binding portion 223 is an adhesive.

[0196] Adhesives, also known as adhesives, binders, or glues, are substances with excellent bonding properties.

[0197] In the above scheme, the binding part 223 is an adhesive to ensure that the multiple first pole tabs 2220 have good connection reliability.

[0198] According to some embodiments of this application, the adhesive contains conductive particles.

[0199] Conductive particles are granular materials that have electrical conductivity.

[0200] The adhesive contains conductive particles. When multiple first electrode tabs 2220 are connected to each other by the adhesive, the multiple first electrode tabs 2220 can be electrically connected through the conductive particles so that current can flow between the multiple first electrode tabs 2220.

[0201] In the above scheme, the adhesive contains conductive particles to enable good current flow between the multiple first electrode tabs 2220.

[0202] According to some embodiments of this application, the number of first tab pieces 2220 in the first tab 222 is N, and the number of first tab pieces 2220 interconnected by the first solder mark 31 is M, satisfying 1 / 2≤M / N<1.

[0203] M / N can be the ratio between the number of first tabs 2220 interconnected by the first solder mark 31 and the total number of first tabs 2220 in the first tab 222.

[0204] M / N < 1 indicates that the number of first tabs 2220 connected to the first solder mark 31 is less than the total number of first tabs 2220 in the first tab 222. Multiple first tabs 2220 are distributed in a stepped manner in the first segment 222a. The size of the first tabs 2220 protruding from the electrode body 221 along the extension direction of the first tab 222 is relatively small.

[0205] M / N≥1 / 2 indicates that the first solder mark 31 connects at least half of the first electrode tabs 2220 among the multiple first electrode tabs 2220.

[0206] In the above scheme, the ratio of the number of first electrode tabs 2220 interconnected by the first solder mark 31 to the number of first electrode tabs 2220 in the first electrode tab 222 is greater than or equal to 1 / 2 and less than 1. On the one hand, the length of the first electrode tabs 2220 extending out of the electrode body 221 can be shorter to reduce the risk of the first electrode tabs 2220 being folded during transportation. On the other hand, the number of connections between the first electrode tabs 2220 and the first electrode lead-out component 23 is large, so that the first electrode tabs 222 and the first electrode lead-out component 23 have a high current carrying capacity.

[0207] In some embodiments, M / N can be, but is not limited to, any one of 1 / 2, 3 / 5, 7 / 10, 4 / 5, or 9 / 10, or a range between any two of them.

[0208] According to some embodiments of this application, 3 / 5 ≤ M / N ≤ 4 / 5.

[0209] When M / N≥3 / 5, the number of connections between the first tab 2220 and the first electrode lead-out component 23 is increased, so that the first tab 2220 and the first electrode lead-out component 23 have a higher current carrying capacity; when M / N≤4 / 5, the length of the first tab 2220 extending out of the electrode body 221 can be shorter, so as to reduce the risk of the first tab 2220 folding during transportation.

[0210] Referring to Figure 3, according to some embodiments of this application, the electrode body 221 includes a flat region 2210, and the electrode sheets of the flat region 2210 are stacked along a first direction X, which is perpendicular to the thickness direction Z of the first wall; along the first direction X, the size of the battery cell 20 is less than or equal to 90 mm.

[0211] When the electrode assembly 22 has a wound structure, the electrode body 221 includes a flat region 2210 and two bending regions. The flat region 2210 connects the two bending regions. The electrode in the flat region 2210 has a flat structure, and the electrode in the bending region has a bent arc-shaped structure. When the electrode assembly 22 has a stacked structure, the electrode in the flat region 2210 is stacked along the first direction X.

[0212] The first direction X can be parallel to the thickness direction of the battery cell 20.

[0213] The dimension of the battery cell 20 along the first direction X can be the thickness of the battery cell 20.

[0214] In the above scheme, the electrode sheets of the flat region 2210 are stacked along the first direction X, which can be parallel to the thickness direction of the battery cell 20; the size of the battery cell 20 along the first direction X is less than or equal to 90mm, the battery cell 20 has a compact structure in the first direction X, and the battery device 100 composed of the battery cells 20 can be provided with more battery cells 20 in the first direction X, which is convenient to improve the energy density of the battery device 100.

[0215] According to some embodiments of this application, the size of the battery cell 20 along the first direction X is less than or equal to 85 mm.

[0216] When the size of the battery cell 20 along the first direction X is less than or equal to 85mm, the battery cell 20 becomes more compact in the first direction X. The battery device 100 composed of the battery cell 20 can have more battery cells 20 arranged in the first direction X, which is conducive to improving the energy density of the battery device 100.

[0217] Please refer to Figure 7, which is a schematic diagram of the structure of the first electrode provided in some embodiments of this application. According to some embodiments of this application, the electrode assembly 22 includes a first electrode 22a, the first electrode 22a includes a first main body portion 221a and a first electrode tab 2220, the first electrode tab 2220 extends from the first edge 221b of the first main body portion 221a, and when the first electrode tab 2220 is unfolded, the size of the first electrode tab 2220 protruding from the first edge 221b is less than or equal to 25mm.

[0218] The first main body 221a has a first current collector and a first active material. The first active material is disposed on the surface of the first current collector, and the first current collector has a first edge 221b. A first tab 2220 extends from the first edge 221b and can be integrally formed with the first current collector for easy processing and manufacturing.

[0219] After the first electrode 22a is manufactured, the first electrode tab 2220 protrudes from the first edge 221b by a size of less than or equal to 25 mm along the extension direction of the first electrode tab 222.

[0220] For ease of description, in Figure 7, T1 represents the size by which the first tab 2220 protrudes from the first edge 221b.

[0221] In the above scheme, the first tab 2220 protrudes from the first edge 221b by a size of less than or equal to 25mm. The first tab 2220 has a small size in its extension direction, which can reduce the risk of the first tab 2220 being folded during transportation and facilitate the improvement of the production yield and production efficiency of the battery cell 20.

[0222] According to some embodiments of this application, when the first electrode tab 2220 is unfolded, the size of the first electrode tab 2220 protruding from the first edge 221b is less than or equal to 22mm.

[0223] When the first tab 2220 protrudes from the first edge 221b by a size less than or equal to 22mm, the first tab 2220 has a smaller size in its extending direction, which can reduce the risk of the first tab 2220 being folded during transportation, thereby improving the reliability of the battery cell 20.

[0224] According to some embodiments of this application, the electrode assembly 22 further includes a second electrode (not shown in the figure). The second electrode includes a second body portion and a second electrode tab. The second electrode tab extends from a second edge of the second body portion, and the second edge and the first edge 221b are located at the same end of the electrode assembly 22. The second body portion and the first body portion 221a constitute the electrode body 221. The electrode assembly 22 includes a second electrode tab 224, the polarity of which is opposite to that of the first electrode tab 222. The second electrode tab 224 includes a plurality of second electrode tabs.

[0225] The battery cell 20 also includes a second electrode lead-out component 25 (see Figure 3). The second electrode lead-out component 25 is disposed on the first wall 213, and is spaced apart from the first electrode lead-out component 23 along the second direction Y. The second direction Y, the first direction X, and the thickness direction Z of the first wall are perpendicular to each other. The first wall 213 is provided with an electrode lead-out hole for the second electrode lead-out component 25 to pass through. A portion of the second electrode lead-out component 25 is disposed in the electrode lead-out hole, and the second electrode lead-out component 25 extends into the interior of the battery cell 20 through the electrode lead-out hole. For example, the second electrode lead-out component 25 protrudes from the inner surface of the first wall 213.

[0226] The second electrode tab 224 includes a third section and a fourth section. The third section is connected to the second electrode lead-out component 25 via a third solder joint, and the fourth section connects the third section and the electrode body 221. The fourth section is provided with a third binding part, and at least some of the second electrode tabs are interconnected through the third binding part.

[0227] The second electrode tab can be configured with the same structure as the first electrode tab 2220. At least some of the multiple second electrode tabs are connected by a third binding portion, which can constrain the second electrode tabs from folding, reducing the risk of a short circuit between the positive and negative electrodes caused by the second electrode tabs being inserted into the electrode body 221, thereby improving the reliability of the battery cell 20. Simultaneously, the size of the second electrode tab protruding from the electrode body 221 along its extension direction can be reduced to decrease the risk of folding during transport, facilitating improved production yield and efficiency of the battery cell 20. After reducing the size of the second electrode tab protruding from the electrode body 221, the multiple second electrode tabs can be arranged in a stepped manner. When the multiple second electrode tabs are connected to the second electrode lead-out component 25, even if the ends of some second electrode tabs are not connected to the second electrode lead-out component 25, the third binding portion can still constrain the second electrode tabs not connected to the second electrode lead-out component 25 from folding, thereby reducing the risk of a short circuit between the positive and negative electrodes caused by the second electrode tabs being inserted into the electrode body 221.

[0228] Furthermore, on the same projection plane perpendicular to the thickness direction Z of the first wall, the orthographic projection of the third binding part does not overlap with the orthographic projection of the second electrode lead-out part 25.

[0229] By setting the orthographic projection of the third binding part to not overlap with the orthographic projection of the second electrode lead-out component 25, the risk of interference between the third binding part and the connection between the second electrode tab 224 and the second electrode lead-out component 25 can be reduced, making it easier to connect the second electrode tab 224 and the second electrode lead-out component 25, so that the second electrode tab 224 and the second electrode lead-out component 25 have better connection reliability.

[0230] In some embodiments, the number of second electrode tabs interconnected by the third binding portion is greater than the number of second electrode tabs interconnected by the third solder joint.

[0231] The number of second electrode tabs connected to each other by the third binding part is greater than the number of second electrode tabs connected to each other by the third solder mark. Some of the second electrode tabs are not connected to the second electrode lead-out component 25 by the third solder mark. The size of the second electrode tabs protruding from the electrode body 221 is small, which can reduce the risk of the second electrode tabs being flipped during transportation and facilitate the improvement of the production yield and production efficiency of the battery cell 20.

[0232] In some embodiments, all the second tabs in the second tab 224 are interconnected by a third binding portion.

[0233] All the second tabs are interconnected through the third binding part, so that the second tab 224 has a high current carrying capacity at the location of the third binding part, which facilitates the transmission of current.

[0234] In some embodiments, the third binding portion is a fourth solder mark. A plurality of second electrode tabs are soldered together to form the fourth solder mark, which serves as the third binding portion, such that at least a portion of the plurality of second electrode tabs are interconnected via the third binding portion.

[0235] In some embodiments, the structure of the second electrode 224 is the same as or similar to that of the first electrode 222, and the arrangement of the third binding part on the second electrode 224 can refer to the arrangement of the binding part 223 on the first electrode 222.

[0236] According to some embodiments of this application, the battery cell 20 further includes a second insulating member 26, which is disposed on the outside of the first wall 213. The second insulating member 26 is used to insulate and isolate the first electrode lead-out component 23 from the first wall 213. For example, the second insulating member 26 is disposed between the first electrode terminal 231 and the first wall 213.

[0237] Please refer to Figure 3. According to some embodiments of this application, the outer casing 21 is cuboid, and the battery cell 20 is a square battery.

[0238] According to some embodiments of this application, this application also provides a battery device 100, which includes a battery cell 20 provided according to any of the above embodiments.

[0239] According to some embodiments of this application, this application also provides an electrical device, which includes a battery cell 20 or a battery device 100 provided according to any of the above embodiments, wherein the battery cell 20 or the battery device 100 is used to provide electrical energy.

[0240] According to some embodiments of this application, this application also provides an energy storage device, which includes a battery cell 20 or a battery device 100 provided according to any of the above embodiments, wherein the battery cell 20 or the battery device 100 is used to store electrical energy and is capable of providing electrical energy.

[0241] According to some embodiments of this application, please refer to Figures 3 to 7. This application provides a battery cell 20, which includes a housing 21, a first electrode lead-out component 23, an electrode assembly 22, a first insulating component 24, and a second electrode lead-out component 25.

[0242] The outer casing 21 includes a housing 211 and an end cap 212. The housing 211 has an opening, and the end cap 212 closes the opening. The end cap 212 is a first wall 213. The first wall 213 is provided with two electrode lead-out holes, which correspond to the first electrode lead-out component 23 and the second electrode lead-out component 25, respectively. A first insulating member 24 is disposed on the inner side of the first wall 213, and the first insulating member 24 is used to insulatingly separate the first wall 213 and the electrode assembly 22.

[0243] One end of the first electrode lead-out component 23 passes through an electrode lead-out hole and extends into the battery cell 20, and one end of the second electrode lead-out component 25 passes through another electrode lead-out hole and extends into the battery cell 20.

[0244] The electrode assembly 22 includes an electrode body 221 and a first tab 222 and a second tab 224 extending from the electrode body 221. The first tab 222 and the second tab 224 have opposite polarities. A first electrode lead-out component 23 is electrically connected to the first tab 222, and a second electrode lead-out component 25 is electrically connected to the second tab 224.

[0245] The first electrode tab 222 includes a plurality of first electrode tab pieces 2220 stacked together. The first electrode tab 222 includes a first segment 222a and a second segment 222b. The first segment 222a is connected to the first electrode lead-out component 23 via a first solder mark 31. The second segment 222b connects the first segment 222a and the electrode body 221. The second segment 222b includes a root portion 2221, a bending portion 2222, and a connecting portion 2223. The root portion 2221 is connected to the electrode body 221. The bending portion 2222 connects the root portion 2221 and the connecting portion 2223. The connecting portion 2223 is connected to the first segment 222a. The plurality of first electrode tab pieces 2220 are gathered in the bending portion 2222. The connecting portion 2223 is provided with a binding portion 223. At least some of the plurality of first electrode tab pieces 2220 are interconnected through the binding portion 223. There are two binding portions 223, which are spaced apart along the extension direction of the first electrode tab 222. The two binding portions 223 are the first binding portion 2231 and the second binding portion 2232. The first binding portion 2231 is closer to the bending portion 2222 than the second binding portion 2232. The number of first electrode tabs 2220 connected to each other through the first binding portion 2231 is greater than the number of first electrode tabs 2220 connected to each other through the second binding portion 2232. All the first electrode tabs 2220 in the first electrode tab 222 are connected to each other through the first binding portion 2231. The number of first electrode tabs 2220 connected to each other through the second binding portion 2232 is greater than the number of first electrode tabs 2220 connected to each other through the first solder mark 31.

[0246] According to the battery cell 20 of this application embodiment, the size of the plurality of first tabs 2220 protruding from the electrode body 221 along the extension direction of the first tab 222 is designed to be small, so as to reduce the risk of the first tabs 2220 folding during transportation and to improve the production yield and production efficiency of the battery cell 20. The plurality of first tabs 2220 are distributed in a stepped manner. The number of first tabs 2220 connected by the first solder mark 31 is less than the number of first tabs 2220 connected by the second binding part 2232. The second binding part 2232 is closer to the first solder mark 31 than the first binding part 2231. By connecting at least a portion of the plurality of first tabs 2220 through the second binding part 2232, the end of the plurality of first tabs 2220 away from the electrode body 221 can be constrained from folding, so as to reduce the risk of the end of the first tab 2220 away from the electrode body 221 folding and inserting into the electrode body 221.

[0247] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that, include: The outer shell, including the first wall; The first electrode lead-out component is disposed on the first wall; An electrode assembly is disposed within the housing. The electrode assembly includes an electrode body and a first electrode tab extending from the electrode body. The first electrode tab includes a plurality of stacked first electrode tab pieces. The first electrode tab includes a first segment and a second segment. The first segment is connected to the first electrode lead-out component via a first solder mark, and the second segment is connected to the first segment and the electrode body. The second section is provided with a binding part, and at least some of the first electrode tabs are connected to each other through the binding part.

2. The battery cell according to claim 1, characterized in that, On the same projection plane perpendicular to the thickness direction of the first wall, the orthographic projection of the binding portion does not overlap with the orthographic projection of the first electrode lead-out component.

3. The battery cell according to claim 1 or 2, characterized in that, The number of first electrode tabs interconnected by the binding portion is greater than the number of first electrode tabs interconnected by the first solder mark.

4. The battery cell according to any one of claims 1-3, characterized in that, The second segment includes a root, a bend, and a connecting portion. The root is connected to the electrode body, the bend connects the root and the connecting portion, and the connecting portion is connected to the first segment. A plurality of first electrode tabs are gathered in the bend. The restraint portion is disposed on the connecting portion.

5. The battery cell according to claim 4, characterized in that, The first electrode tab includes a plurality of binding portions, which are spaced apart along the extension direction of the first electrode tab.

6. The battery cell according to claim 5, characterized in that, The number of the binding parts is two, namely a first binding part and a second binding part, wherein the first binding part is closer to the bending part than the second binding part.

7. The battery cell according to claim 6, characterized in that, The number of first electrode tabs interconnected by the first binding portion is greater than the number of first electrode tabs interconnected by the second binding portion.

8. The battery cell according to claim 6 or 7, characterized in that, All the first electrode tabs in the first electrode tab are interconnected through the first binding part.

9. The battery cell according to any one of claims 6-8, characterized in that, The number of first tabs interconnected by the second binding portion is greater than the number of first tabs interconnected by the first solder mark.

10. The battery cell according to any one of claims 6-9, characterized in that, Along the thickness direction of the first wall, the first binding portion is closer to the first wall than the second binding portion.

11. The battery cell according to any one of claims 6-10, characterized in that, Along the first direction, the first binding portion is disposed on the side of the first electrode lead-out component. On the same projection plane perpendicular to the first direction, the orthographic projection of the first binding portion at least partially overlaps with the orthographic projection of the first electrode lead-out component. The first direction is perpendicular to the thickness direction of the first wall.

12. The battery cell according to any one of claims 6-11, characterized in that, The first electrode lead-out component includes a first electrode terminal, and the first segment is connected to the first electrode terminal through the first solder mark.

13. The battery cell according to claim 12, characterized in that, The battery cell also includes: A first insulating element is disposed between the first wall and the electrode assembly; The first insulating member has a protrusion on the side facing the electrode body, and the protrusion surrounds the first electrode terminal.

14. The battery cell according to claim 13, characterized in that, On the same projection plane perpendicular to the thickness direction of the first wall, the orthographic projection of the second binding portion at least partially overlaps with the orthographic projection of the protrusion.

15. The battery cell according to claim 13 or 14, characterized in that, The first electrode terminal has a first surface facing the electrode body; Along the direction from the first wall toward the electrode body, the first surface extends beyond the protrusion; The first segment is connected to the first surface via the first solder mark.

16. The battery cell according to any one of claims 1-15, characterized in that, The binding part is the second solder mark.

17. The battery cell according to any one of claims 1-15, characterized in that, The binding part is an adhesive.

18. The battery cell according to claim 17, characterized in that, The adhesive contains conductive particles.

19. The battery cell according to any one of claims 1-18, characterized in that, The number of first tabs in the first tab is N, and the number of first tabs connected to each other by the first solder mark is M, satisfying 1 / 2≤M / N<1.

20. The battery cell according to claim 19, characterized in that, 3 / 5 ≤ M / N ≤ 4 / 5.

21. The battery cell according to any one of claims 1-20, characterized in that, The electrode body includes a flat region, and the electrode sheets in the flat region are stacked along a first direction, which is perpendicular to the thickness direction of the first wall. Along the first direction, the size of the battery cell is less than or equal to 90 mm.

22. The battery cell according to claim 21, characterized in that, Along the first direction, the size of the battery cell is less than or equal to 85 mm.

23. The battery cell according to claim 21 or 22, characterized in that, The electrode assembly includes a first electrode plate, which includes a first body portion and a first electrode tab. The first electrode tab extends from a first edge of the first body portion, and when the first electrode tab is unfolded, the size of the first electrode tab protruding from the first edge is less than or equal to 25 mm.

24. The battery cell according to claim 23, characterized in that, When the first electrode tab is unfolded, the first electrode tab protrudes beyond the first edge by a dimension of less than or equal to 22 mm.

25. A battery device, characterized in that, Includes the battery cell as described in any one of claims 1-24.

26. An electrical appliance, characterized in that, Includes a battery cell as described in any one of claims 1-24 or a battery device as described in claim 25, wherein the battery cell or the battery device is used to provide electrical energy.

27. An energy storage device, characterized in that, Includes a battery cell as described in any one of claims 1-24 or a battery device as described in claim 25, wherein the battery cell or the battery device is used to store electrical energy and is capable of providing electrical energy.

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